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target: Obtain se_node_acl->acl_kref during get_initiator_node_acl
[mirror_ubuntu-zesty-kernel.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
5538d294 37#include <linux/vmalloc.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
ba929992 41#include <scsi/scsi_proto.h>
9ec1e1ce 42#include <scsi/scsi_common.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);
de64d3a6 268 kvfree(se_sess->sess_cmd_map);
c0add7fd
NB		 269 se_sess->sess_cmd_map = NULL;
270 return -ENOMEM;
271 }
272
273 return 0;
274}
275EXPORT_SYMBOL(transport_alloc_session_tags);
276
277struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 278 unsigned int tag_size,
279 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 280{
281 struct se_session *se_sess;
282 int rc;
283
e70beee7 284 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 285 if (IS_ERR(se_sess))
286 return se_sess;
287
288 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
289 if (rc < 0) {
290 transport_free_session(se_sess);
291 return ERR_PTR(-ENOMEM);
292 }
293
294 return se_sess;
295}
296EXPORT_SYMBOL(transport_init_session_tags);
297
c66ac9db 298/*
140854cb 299 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 300 */
301void __transport_register_session(
302 struct se_portal_group *se_tpg,
303 struct se_node_acl *se_nacl,
304 struct se_session *se_sess,
305 void *fabric_sess_ptr)
306{
9ac8928e 307 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 308 unsigned char buf[PR_REG_ISID_LEN];
309
310 se_sess->se_tpg = se_tpg;
311 se_sess->fabric_sess_ptr = fabric_sess_ptr;
312 /*
313 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
314 *
315 * Only set for struct se_session's that will actually be moving I/O.
316 * eg: *NOT* discovery sessions.
317 */
318 if (se_nacl) {
bffb5128
NB		 319 /*
320 *
321 * Determine if fabric allows for T10-PI feature bits exposed to
322 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
323 *
324 * If so, then always save prot_type on a per se_node_acl node
325 * basis and re-instate the previous sess_prot_type to avoid
326 * disabling PI from below any previously initiator side
327 * registered LUNs.
328 */
329 if (se_nacl->saved_prot_type)
330 se_sess->sess_prot_type = se_nacl->saved_prot_type;
331 else if (tfo->tpg_check_prot_fabric_only)
332 se_sess->sess_prot_type = se_nacl->saved_prot_type =
333 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 334 /*
335 * If the fabric module supports an ISID based TransportID,
336 * save this value in binary from the fabric I_T Nexus now.
337 */
e3d6f909 338 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 339 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 340 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 341 &buf[0], PR_REG_ISID_LEN);
342 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
343 }
afb999ff 344
c66ac9db
NB		 345 spin_lock_irq(&se_nacl->nacl_sess_lock);
346 /*
347 * The se_nacl->nacl_sess pointer will be set to the
348 * last active I_T Nexus for each struct se_node_acl.
349 */
350 se_nacl->nacl_sess = se_sess;
351
352 list_add_tail(&se_sess->sess_acl_list,
353 &se_nacl->acl_sess_list);
354 spin_unlock_irq(&se_nacl->nacl_sess_lock);
355 }
356 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
357
6708bb27 358 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 359 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 360}
361EXPORT_SYMBOL(__transport_register_session);
362
363void transport_register_session(
364 struct se_portal_group *se_tpg,
365 struct se_node_acl *se_nacl,
366 struct se_session *se_sess,
367 void *fabric_sess_ptr)
368{
140854cb
NB		 369 unsigned long flags;
370
371 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 372 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 373 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 374}
375EXPORT_SYMBOL(transport_register_session);
376
ecf0dd66 377static void target_release_session(struct kref *kref)
41ac82b6
NB		 378{
379 struct se_session *se_sess = container_of(kref,
380 struct se_session, sess_kref);
381 struct se_portal_group *se_tpg = se_sess->se_tpg;
382
383 se_tpg->se_tpg_tfo->close_session(se_sess);
384}
385
d36ad77f 386int target_get_session(struct se_session *se_sess)
41ac82b6 387{
d36ad77f 388 return kref_get_unless_zero(&se_sess->sess_kref);
41ac82b6
NB		 389}
390EXPORT_SYMBOL(target_get_session);
391
33933a0e 392void target_put_session(struct se_session *se_sess)
41ac82b6 393{
33933a0e 394 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 395}
396EXPORT_SYMBOL(target_put_session);
397
f8e471f9
NB		 398ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
399{
400 struct se_session *se_sess;
401 ssize_t len = 0;
402
403 spin_lock_bh(&se_tpg->session_lock);
404 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
405 if (!se_sess->se_node_acl)
406 continue;
407 if (!se_sess->se_node_acl->dynamic_node_acl)
408 continue;
409 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
410 break;
411
412 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
413 se_sess->se_node_acl->initiatorname);
414 len += 1; /* Include NULL terminator */
415 }
416 spin_unlock_bh(&se_tpg->session_lock);
417
418 return len;
419}
420EXPORT_SYMBOL(target_show_dynamic_sessions);
421
afb999ff
NB		 422static void target_complete_nacl(struct kref *kref)
423{
424 struct se_node_acl *nacl = container_of(kref,
425 struct se_node_acl, acl_kref);
426
427 complete(&nacl->acl_free_comp);
428}
429
430void target_put_nacl(struct se_node_acl *nacl)
431{
432 kref_put(&nacl->acl_kref, target_complete_nacl);
433}
21aaa23b 434EXPORT_SYMBOL(target_put_nacl);
afb999ff 435
c66ac9db
NB		 436void transport_deregister_session_configfs(struct se_session *se_sess)
437{
438 struct se_node_acl *se_nacl;
23388864 439 unsigned long flags;
c66ac9db
NB		 440 /*
441 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
442 */
443 se_nacl = se_sess->se_node_acl;
6708bb27 444 if (se_nacl) {
23388864 445 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 446 if (se_nacl->acl_stop == 0)
447 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 448 /*
449 * If the session list is empty, then clear the pointer.
450 * Otherwise, set the struct se_session pointer from the tail
451 * element of the per struct se_node_acl active session list.
452 */
453 if (list_empty(&se_nacl->acl_sess_list))
454 se_nacl->nacl_sess = NULL;
455 else {
456 se_nacl->nacl_sess = container_of(
457 se_nacl->acl_sess_list.prev,
458 struct se_session, sess_acl_list);
459 }
23388864 460 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 461 }
462}
463EXPORT_SYMBOL(transport_deregister_session_configfs);
464
465void transport_free_session(struct se_session *se_sess)
466{
21aaa23b
NB		 467 struct se_node_acl *se_nacl = se_sess->se_node_acl;
468 /*
469 * Drop the se_node_acl->nacl_kref obtained from within
470 * core_tpg_get_initiator_node_acl().
471 */
472 if (se_nacl) {
473 se_sess->se_node_acl = NULL;
474 target_put_nacl(se_nacl);
475 }
c0add7fd
NB		 476 if (se_sess->sess_cmd_map) {
477 percpu_ida_destroy(&se_sess->sess_tag_pool);
de64d3a6 478 kvfree(se_sess->sess_cmd_map);
c0add7fd 479 }
c66ac9db
NB		 480 kmem_cache_free(se_sess_cache, se_sess);
481}
482EXPORT_SYMBOL(transport_free_session);
483
484void transport_deregister_session(struct se_session *se_sess)
485{
486 struct se_portal_group *se_tpg = se_sess->se_tpg;
9ac8928e 487 const struct target_core_fabric_ops *se_tfo;
c66ac9db 488 struct se_node_acl *se_nacl;
e63a8e19 489 unsigned long flags;
21aaa23b 490 bool drop_nacl = false;
c66ac9db 491
6708bb27 492 if (!se_tpg) {
c66ac9db
NB		 493 transport_free_session(se_sess);
494 return;
495 }
01468346 496 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 497
e63a8e19 498 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 499 list_del(&se_sess->sess_list);
500 se_sess->se_tpg = NULL;
501 se_sess->fabric_sess_ptr = NULL;
e63a8e19 502 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 503
504 /*
505 * Determine if we need to do extra work for this initiator node's
506 * struct se_node_acl if it had been previously dynamically generated.
507 */
508 se_nacl = se_sess->se_node_acl;
01468346 509
403edd78 510 mutex_lock(&se_tpg->acl_node_mutex);
01468346
NB		 511 if (se_nacl && se_nacl->dynamic_node_acl) {
512 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
513 list_del(&se_nacl->acl_list);
403edd78 514 drop_nacl = true;
c66ac9db 515 }
c66ac9db 516 }
403edd78 517 mutex_unlock(&se_tpg->acl_node_mutex);
c66ac9db 518
403edd78
NB		 519 if (drop_nacl) {
520 core_tpg_wait_for_nacl_pr_ref(se_nacl);
521 core_free_device_list_for_node(se_nacl, se_tpg);
21aaa23b 522 se_sess->se_node_acl = NULL;
403edd78 523 kfree(se_nacl);
403edd78 524 }
6708bb27 525 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 526 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 527 /*
125d0119 528 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff 529 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
21aaa23b 530 * removal context from within transport_free_session() code.
01468346 531 */
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
fb3269ba
QT		 724 if (cmd->cpuid == -1)
725 queue_work(target_completion_wq, &cmd->work);
726 else
727 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
c66ac9db 728}
6bb35e00
CH		 729EXPORT_SYMBOL(target_complete_cmd);
730
2426bd45
RD		 731void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
732{
733 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
734 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
735 cmd->residual_count += cmd->data_length - length;
736 } else {
737 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
738 cmd->residual_count = cmd->data_length - length;
739 }
740
741 cmd->data_length = length;
742 }
743
744 target_complete_cmd(cmd, scsi_status);
745}
746EXPORT_SYMBOL(target_complete_cmd_with_length);
747
cf572a96 748static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 749{
cf572a96
CH		 750 struct se_device *dev = cmd->se_dev;
751 unsigned long flags;
c66ac9db 752
cf572a96
CH		 753 spin_lock_irqsave(&dev->execute_task_lock, flags);
754 if (!cmd->state_active) {
755 list_add_tail(&cmd->state_list, &dev->state_list);
756 cmd->state_active = true;
c66ac9db 757 }
cf572a96 758 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 759}
760
07bde79a 761/*
f147abb4 762 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 763 */
7a6f0a1e
CH		 764static void transport_write_pending_qf(struct se_cmd *cmd);
765static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 766
0fd97ccf 767void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 768{
769 struct se_device *dev = container_of(work, struct se_device,
770 qf_work_queue);
bcac364a 771 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 772 struct se_cmd *cmd, *cmd_tmp;
773
774 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 775 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
776 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 777
bcac364a 778 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 779 list_del(&cmd->se_qf_node);
33940d09 780 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 781
6708bb27 782 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 783 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 784 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 785 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
786 : "UNKNOWN");
f7a5cc0b 787
7a6f0a1e
CH		 788 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
789 transport_write_pending_qf(cmd);
790 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
791 transport_complete_qf(cmd);
07bde79a 792 }
07bde79a
NB		 793}
794
c66ac9db
NB		 795unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
796{
797 switch (cmd->data_direction) {
798 case DMA_NONE:
799 return "NONE";
800 case DMA_FROM_DEVICE:
801 return "READ";
802 case DMA_TO_DEVICE:
803 return "WRITE";
804 case DMA_BIDIRECTIONAL:
805 return "BIDI";
806 default:
807 break;
808 }
809
810 return "UNKNOWN";
811}
812
813void transport_dump_dev_state(
814 struct se_device *dev,
815 char *b,
816 int *bl)
817{
818 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 819 if (dev->export_count)
c66ac9db 820 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 821 else
c66ac9db 822 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 823
5f41a31d 824 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 825 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 826 dev->dev_attrib.block_size,
827 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 828 *bl += sprintf(b + *bl, " ");
829}
830
c66ac9db
NB		 831void transport_dump_vpd_proto_id(
832 struct t10_vpd *vpd,
833 unsigned char *p_buf,
834 int p_buf_len)
835{
836 unsigned char buf[VPD_TMP_BUF_SIZE];
837 int len;
838
839 memset(buf, 0, VPD_TMP_BUF_SIZE);
840 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
841
842 switch (vpd->protocol_identifier) {
843 case 0x00:
844 sprintf(buf+len, "Fibre Channel\n");
845 break;
846 case 0x10:
847 sprintf(buf+len, "Parallel SCSI\n");
848 break;
849 case 0x20:
850 sprintf(buf+len, "SSA\n");
851 break;
852 case 0x30:
853 sprintf(buf+len, "IEEE 1394\n");
854 break;
855 case 0x40:
856 sprintf(buf+len, "SCSI Remote Direct Memory Access"
857 " Protocol\n");
858 break;
859 case 0x50:
860 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
861 break;
862 case 0x60:
863 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
864 break;
865 case 0x70:
866 sprintf(buf+len, "Automation/Drive Interface Transport"
867 " Protocol\n");
868 break;
869 case 0x80:
870 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
871 break;
872 default:
873 sprintf(buf+len, "Unknown 0x%02x\n",
874 vpd->protocol_identifier);
875 break;
876 }
877
878 if (p_buf)
879 strncpy(p_buf, buf, p_buf_len);
880 else
6708bb27 881 pr_debug("%s", buf);
c66ac9db
NB		 882}
883
884void
885transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
886{
887 /*
888 * Check if the Protocol Identifier Valid (PIV) bit is set..
889 *
890 * from spc3r23.pdf section 7.5.1
891 */
892 if (page_83[1] & 0x80) {
893 vpd->protocol_identifier = (page_83[0] & 0xf0);
894 vpd->protocol_identifier_set = 1;
895 transport_dump_vpd_proto_id(vpd, NULL, 0);
896 }
897}
898EXPORT_SYMBOL(transport_set_vpd_proto_id);
899
900int transport_dump_vpd_assoc(
901 struct t10_vpd *vpd,
902 unsigned char *p_buf,
903 int p_buf_len)
904{
905 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 906 int ret = 0;
907 int len;
c66ac9db
NB		 908
909 memset(buf, 0, VPD_TMP_BUF_SIZE);
910 len = sprintf(buf, "T10 VPD Identifier Association: ");
911
912 switch (vpd->association) {
913 case 0x00:
914 sprintf(buf+len, "addressed logical unit\n");
915 break;
916 case 0x10:
917 sprintf(buf+len, "target port\n");
918 break;
919 case 0x20:
920 sprintf(buf+len, "SCSI target device\n");
921 break;
922 default:
923 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 924 ret = -EINVAL;
c66ac9db
NB		 925 break;
926 }
927
928 if (p_buf)
929 strncpy(p_buf, buf, p_buf_len);
930 else
6708bb27 931 pr_debug("%s", buf);
c66ac9db
NB		 932
933 return ret;
934}
935
936int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
937{
938 /*
939 * The VPD identification association..
940 *
941 * from spc3r23.pdf Section 7.6.3.1 Table 297
942 */
943 vpd->association = (page_83[1] & 0x30);
944 return transport_dump_vpd_assoc(vpd, NULL, 0);
945}
946EXPORT_SYMBOL(transport_set_vpd_assoc);
947
948int transport_dump_vpd_ident_type(
949 struct t10_vpd *vpd,
950 unsigned char *p_buf,
951 int p_buf_len)
952{
953 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 954 int ret = 0;
955 int len;
c66ac9db
NB		 956
957 memset(buf, 0, VPD_TMP_BUF_SIZE);
958 len = sprintf(buf, "T10 VPD Identifier Type: ");
959
960 switch (vpd->device_identifier_type) {
961 case 0x00:
962 sprintf(buf+len, "Vendor specific\n");
963 break;
964 case 0x01:
965 sprintf(buf+len, "T10 Vendor ID based\n");
966 break;
967 case 0x02:
968 sprintf(buf+len, "EUI-64 based\n");
969 break;
970 case 0x03:
971 sprintf(buf+len, "NAA\n");
972 break;
973 case 0x04:
974 sprintf(buf+len, "Relative target port identifier\n");
975 break;
976 case 0x08:
977 sprintf(buf+len, "SCSI name string\n");
978 break;
979 default:
980 sprintf(buf+len, "Unsupported: 0x%02x\n",
981 vpd->device_identifier_type);
e3d6f909 982 ret = -EINVAL;
c66ac9db
NB		 983 break;
984 }
985
e3d6f909
AG		 986 if (p_buf) {
987 if (p_buf_len < strlen(buf)+1)
988 return -EINVAL;
c66ac9db 989 strncpy(p_buf, buf, p_buf_len);
e3d6f909 990 } else {
6708bb27 991 pr_debug("%s", buf);
e3d6f909 992 }
c66ac9db
NB		 993
994 return ret;
995}
996
997int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
998{
999 /*
1000 * The VPD identifier type..
1001 *
1002 * from spc3r23.pdf Section 7.6.3.1 Table 298
1003 */
1004 vpd->device_identifier_type = (page_83[1] & 0x0f);
1005 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1006}
1007EXPORT_SYMBOL(transport_set_vpd_ident_type);
1008
1009int transport_dump_vpd_ident(
1010 struct t10_vpd *vpd,
1011 unsigned char *p_buf,
1012 int p_buf_len)
1013{
1014 unsigned char buf[VPD_TMP_BUF_SIZE];
1015 int ret = 0;
1016
1017 memset(buf, 0, VPD_TMP_BUF_SIZE);
1018
1019 switch (vpd->device_identifier_code_set) {
1020 case 0x01: /* Binary */
703d641d
DC		 1021 snprintf(buf, sizeof(buf),
1022 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1023 &vpd->device_identifier[0]);
1024 break;
1025 case 0x02: /* ASCII */
703d641d
DC		 1026 snprintf(buf, sizeof(buf),
1027 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1028 &vpd->device_identifier[0]);
1029 break;
1030 case 0x03: /* UTF-8 */
703d641d
DC		 1031 snprintf(buf, sizeof(buf),
1032 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1033 &vpd->device_identifier[0]);
1034 break;
1035 default:
1036 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1037 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1038 ret = -EINVAL;
c66ac9db
NB		 1039 break;
1040 }
1041
1042 if (p_buf)
1043 strncpy(p_buf, buf, p_buf_len);
1044 else
6708bb27 1045 pr_debug("%s", buf);
c66ac9db
NB		 1046
1047 return ret;
1048}
1049
1050int
1051transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1052{
1053 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1054 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1055
1056 /*
1057 * The VPD Code Set (encoding)
1058 *
1059 * from spc3r23.pdf Section 7.6.3.1 Table 296
1060 */
1061 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1062 switch (vpd->device_identifier_code_set) {
1063 case 0x01: /* Binary */
1064 vpd->device_identifier[j++] =
1065 hex_str[vpd->device_identifier_type];
1066 while (i < (4 + page_83[3])) {
1067 vpd->device_identifier[j++] =
1068 hex_str[(page_83[i] & 0xf0) >> 4];
1069 vpd->device_identifier[j++] =
1070 hex_str[page_83[i] & 0x0f];
1071 i++;
1072 }
1073 break;
1074 case 0x02: /* ASCII */
1075 case 0x03: /* UTF-8 */
1076 while (i < (4 + page_83[3]))
1077 vpd->device_identifier[j++] = page_83[i++];
1078 break;
1079 default:
1080 break;
1081 }
1082
1083 return transport_dump_vpd_ident(vpd, NULL, 0);
1084}
1085EXPORT_SYMBOL(transport_set_vpd_ident);
1086
8f9b5654
NB		 1087static sense_reason_t
1088target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1089 unsigned int size)
1090{
1091 u32 mtl;
1092
1093 if (!cmd->se_tfo->max_data_sg_nents)
1094 return TCM_NO_SENSE;
1095 /*
1096 * Check if fabric enforced maximum SGL entries per I/O descriptor
1097 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1098 * residual_count and reduce original cmd->data_length to maximum
1099 * length based on single PAGE_SIZE entry scatter-lists.
1100 */
1101 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1102 if (cmd->data_length > mtl) {
1103 /*
1104 * If an existing CDB overflow is present, calculate new residual
1105 * based on CDB size minus fabric maximum transfer length.
1106 *
1107 * If an existing CDB underflow is present, calculate new residual
1108 * based on original cmd->data_length minus fabric maximum transfer
1109 * length.
1110 *
1111 * Otherwise, set the underflow residual based on cmd->data_length
1112 * minus fabric maximum transfer length.
1113 */
1114 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1115 cmd->residual_count = (size - mtl);
1116 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1117 u32 orig_dl = size + cmd->residual_count;
1118 cmd->residual_count = (orig_dl - mtl);
1119 } else {
1120 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1121 cmd->residual_count = (cmd->data_length - mtl);
1122 }
1123 cmd->data_length = mtl;
1124 /*
1125 * Reset sbc_check_prot() calculated protection payload
1126 * length based upon the new smaller MTL.
1127 */
1128 if (cmd->prot_length) {
1129 u32 sectors = (mtl / dev->dev_attrib.block_size);
1130 cmd->prot_length = dev->prot_length * sectors;
1131 }
1132 }
1133 return TCM_NO_SENSE;
1134}
1135
de103c93
CH		 1136sense_reason_t
1137target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1138{
1139 struct se_device *dev = cmd->se_dev;
1140
1141 if (cmd->unknown_data_length) {
1142 cmd->data_length = size;
1143 } else if (size != cmd->data_length) {
1144 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1145 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1146 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1147 cmd->data_length, size, cmd->t_task_cdb[0]);
1148
c72c5250
RD		 1149 if (cmd->data_direction == DMA_TO_DEVICE &&
1150 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1151 pr_err("Rejecting underflow/overflow WRITE data\n");
de103c93 1152 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1153 }
1154 /*
1155 * Reject READ_* or WRITE_* with overflow/underflow for
1156 * type SCF_SCSI_DATA_CDB.
1157 */
0fd97ccf 1158 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1159 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1160 " CDB on non 512-byte sector setup subsystem"
1161 " plugin: %s\n", dev->transport->name);
1162 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1163 return TCM_INVALID_CDB_FIELD;
9b3b8041 1164 }
4c054ba6
NB		 1165 /*
1166 * For the overflow case keep the existing fabric provided
1167 * ->data_length. Otherwise for the underflow case, reset
1168 * ->data_length to the smaller SCSI expected data transfer
1169 * length.
1170 */
9b3b8041
CH		 1171 if (size > cmd->data_length) {
1172 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1173 cmd->residual_count = (size - cmd->data_length);
1174 } else {
1175 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1176 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1177 cmd->data_length = size;
9b3b8041 1178 }
9b3b8041
CH		 1179 }
1180
8f9b5654 1181 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1182
9b3b8041
CH		 1183}
1184
c66ac9db
NB		 1185/*
1186 * Used by fabric modules containing a local struct se_cmd within their
1187 * fabric dependent per I/O descriptor.
649ee054
BVA		 1188 *
1189 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1190 */
1191void transport_init_se_cmd(
1192 struct se_cmd *cmd,
9ac8928e 1193 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1194 struct se_session *se_sess,
1195 u32 data_length,
1196 int data_direction,
1197 int task_attr,
1198 unsigned char *sense_buffer)
1199{
5951146d 1200 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1201 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1202 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1203 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1204 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1205 init_completion(&cmd->cmd_wait_comp);
cf572a96 1206 init_completion(&cmd->task_stop_comp);
a1d8b49a 1207 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1208 kref_init(&cmd->cmd_kref);
7d680f3b 1209 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1210
1211 cmd->se_tfo = tfo;
1212 cmd->se_sess = se_sess;
1213 cmd->data_length = data_length;
1214 cmd->data_direction = data_direction;
1215 cmd->sam_task_attr = task_attr;
1216 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1217
1218 cmd->state_active = false;
c66ac9db
NB		 1219}
1220EXPORT_SYMBOL(transport_init_se_cmd);
1221
de103c93
CH		 1222static sense_reason_t
1223transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1224{
019c4ca6
CH		 1225 struct se_device *dev = cmd->se_dev;
1226
c66ac9db
NB		 1227 /*
1228 * Check if SAM Task Attribute emulation is enabled for this
1229 * struct se_device storage object
1230 */
a3541703 1231 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1232 return 0;
1233
68d81f40 1234 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1235 pr_debug("SAM Task Attribute ACA"
c66ac9db 1236 " emulation is not supported\n");
de103c93 1237 return TCM_INVALID_CDB_FIELD;
c66ac9db 1238 }
9c31820b 1239
c66ac9db
NB		 1240 return 0;
1241}
1242
de103c93
CH		 1243sense_reason_t
1244target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1245{
0fd97ccf 1246 struct se_device *dev = cmd->se_dev;
de103c93 1247 sense_reason_t ret;
c66ac9db 1248
c66ac9db
NB		 1249 /*
1250 * Ensure that the received CDB is less than the max (252 + 8) bytes
1251 * for VARIABLE_LENGTH_CMD
1252 */
1253 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1254 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1255 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1256 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1257 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1258 }
1259 /*
1260 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1261 * allocate the additional extended CDB buffer now.. Otherwise
1262 * setup the pointer from __t_task_cdb to t_task_cdb.
1263 */
a1d8b49a
AG		 1264 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1265 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1266 GFP_KERNEL);
6708bb27
AG		 1267 if (!cmd->t_task_cdb) {
1268 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1269 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1270 scsi_command_size(cdb),
a1d8b49a 1271 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1272 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1273 }
1274 } else
a1d8b49a 1275 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1276 /*
a1d8b49a 1277 * Copy the original CDB into cmd->
c66ac9db 1278 */
a1d8b49a 1279 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1280
e5c0d6ad
RD		 1281 trace_target_sequencer_start(cmd);
1282
cb4f4d3c
CH		 1283 /*
1284 * Check for an existing UNIT ATTENTION condition
1285 */
de103c93
CH		 1286 ret = target_scsi3_ua_check(cmd);
1287 if (ret)
1288 return ret;
cb4f4d3c 1289
c87fbd56 1290 ret = target_alua_state_check(cmd);
de103c93
CH		 1291 if (ret)
1292 return ret;
cb4f4d3c 1293
d977f437 1294 ret = target_check_reservation(cmd);
f85eda8d
NB		 1295 if (ret) {
1296 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1297 return ret;
f85eda8d 1298 }
cb4f4d3c 1299
0fd97ccf 1300 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1301 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1302 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1303 cmd->se_tfo->get_fabric_name(),
1304 cmd->se_sess->se_node_acl->initiatorname,
1305 cmd->t_task_cdb[0]);
de103c93
CH		 1306 if (ret)
1307 return ret;
1308
1309 ret = transport_check_alloc_task_attr(cmd);
1310 if (ret)
c66ac9db 1311 return ret;
cb4f4d3c 1312
cb4f4d3c 1313 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1314 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1315 return 0;
1316}
a12f41f8 1317EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1318
695434e1
NB		 1319/*
1320 * Used by fabric module frontends to queue tasks directly.
ac75d8be 1321 * May only be used from process context.
695434e1
NB		 1322 */
1323int transport_handle_cdb_direct(
1324 struct se_cmd *cmd)
1325{
de103c93 1326 sense_reason_t ret;
dd8ae59d 1327
695434e1
NB		 1328 if (!cmd->se_lun) {
1329 dump_stack();
6708bb27 1330 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1331 return -EINVAL;
1332 }
1333 if (in_interrupt()) {
1334 dump_stack();
6708bb27 1335 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1336 " from interrupt context\n");
1337 return -EINVAL;
1338 }
dd8ae59d 1339 /*
af877292
CH		 1340 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1341 * outstanding descriptors are handled correctly during shutdown via
1342 * transport_wait_for_tasks()
dd8ae59d
NB		 1343 *
1344 * Also, we don't take cmd->t_state_lock here as we only expect
1345 * this to be called for initial descriptor submission.
1346 */
1347 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1348 cmd->transport_state |= CMD_T_ACTIVE;
1349
dd8ae59d
NB		 1350 /*
1351 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1352 * so follow TRANSPORT_NEW_CMD processing thread context usage
1353 * and call transport_generic_request_failure() if necessary..
1354 */
1355 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1356 if (ret)
1357 transport_generic_request_failure(cmd, ret);
dd8ae59d 1358 return 0;
695434e1
NB		 1359}
1360EXPORT_SYMBOL(transport_handle_cdb_direct);
1361
c5ff8d6b 1362sense_reason_t
de103c93
CH		 1363transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1364 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1365{
1366 if (!sgl || !sgl_count)
1367 return 0;
1368
1369 /*
1370 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1371 * scatterlists already have been set to follow what the fabric
1372 * passes for the original expected data transfer length.
1373 */
1374 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1375 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1376 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1377 return TCM_INVALID_CDB_FIELD;
1378 }
1379
1380 cmd->t_data_sg = sgl;
1381 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1382 cmd->t_bidi_data_sg = sgl_bidi;
1383 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1384
de103c93
CH		 1385 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1386 return 0;
1387}
1388
a026757f
NB		 1389/*
1390 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1391 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1392 *
1393 * @se_cmd: command descriptor to submit
1394 * @se_sess: associated se_sess for endpoint
1395 * @cdb: pointer to SCSI CDB
1396 * @sense: pointer to SCSI sense buffer
1397 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1398 * @data_length: fabric expected data transfer length
1399 * @task_addr: SAM task attribute
1400 * @data_dir: DMA data direction
1401 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1402 * @sgl: struct scatterlist memory for unidirectional mapping
1403 * @sgl_count: scatterlist count for unidirectional mapping
1404 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1405 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1406 * @sgl_prot: struct scatterlist memory protection information
1407 * @sgl_prot_count: scatterlist count for protection information
a6360785 1408 *
649ee054
BVA		 1409 * Task tags are supported if the caller has set @se_cmd->tag.
1410 *
d6dfc868
RD		 1411 * Returns non zero to signal active I/O shutdown failure. All other
1412 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1413 * but still return zero here.
1414 *
a6360785
NB		 1415 * This may only be called from process context, and also currently
1416 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1417 */
1418int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1419 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1420 u32 data_length, int task_attr, int data_dir, int flags,
1421 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1422 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1423 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1424{
1425 struct se_portal_group *se_tpg;
de103c93
CH		 1426 sense_reason_t rc;
1427 int ret;
a6360785
NB		 1428
1429 se_tpg = se_sess->se_tpg;
1430 BUG_ON(!se_tpg);
1431 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1432 BUG_ON(in_interrupt());
1433 /*
1434 * Initialize se_cmd for target operation. From this point
1435 * exceptions are handled by sending exception status via
1436 * target_core_fabric_ops->queue_status() callback
1437 */
1438 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1439 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1440 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1441 se_cmd->unknown_data_length = 1;
a6360785
NB		 1442 /*
1443 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1444 * se_sess->sess_cmd_list. A second kref_get here is necessary
1445 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1446 * kref_put() to happen during fabric packet acknowledgement.
1447 */
afc16604 1448 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1449 if (ret)
1450 return ret;
a6360785
NB		 1451 /*
1452 * Signal bidirectional data payloads to target-core
1453 */
1454 if (flags & TARGET_SCF_BIDI_OP)
1455 se_cmd->se_cmd_flags |= SCF_BIDI;
1456 /*
1457 * Locate se_lun pointer and attach it to struct se_cmd
1458 */
de103c93
CH		 1459 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1460 if (rc) {
1461 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1462 target_put_sess_cmd(se_cmd);
d6dfc868 1463 return 0;
735703ca 1464 }
b5b8e298
SG		 1465
1466 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1467 if (rc != 0) {
1468 transport_generic_request_failure(se_cmd, rc);
1469 return 0;
1470 }
1471
def2b339
NB		 1472 /*
1473 * Save pointers for SGLs containing protection information,
1474 * if present.
1475 */
1476 if (sgl_prot_count) {
1477 se_cmd->t_prot_sg = sgl_prot;
1478 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1479 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1480 }
d6e0175c 1481
a026757f
NB		 1482 /*
1483 * When a non zero sgl_count has been passed perform SGL passthrough
1484 * mapping for pre-allocated fabric memory instead of having target
1485 * core perform an internal SGL allocation..
1486 */
1487 if (sgl_count != 0) {
1488 BUG_ON(!sgl);
1489
944981c7
NB		 1490 /*
1491 * A work-around for tcm_loop as some userspace code via
1492 * scsi-generic do not memset their associated read buffers,
1493 * so go ahead and do that here for type non-data CDBs. Also
1494 * note that this is currently guaranteed to be a single SGL
1495 * for this case by target core in target_setup_cmd_from_cdb()
1496 * -> transport_generic_cmd_sequencer().
1497 */
1498 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1499 se_cmd->data_direction == DMA_FROM_DEVICE) {
1500 unsigned char *buf = NULL;
1501
1502 if (sgl)
1503 buf = kmap(sg_page(sgl)) + sgl->offset;
1504
1505 if (buf) {
1506 memset(buf, 0, sgl->length);
1507 kunmap(sg_page(sgl));
1508 }
1509 }
1510
a026757f
NB		 1511 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1512 sgl_bidi, sgl_bidi_count);
1513 if (rc != 0) {
de103c93 1514 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1515 return 0;
1516 }
1517 }
def2b339 1518
11e319ed
AG		 1519 /*
1520 * Check if we need to delay processing because of ALUA
1521 * Active/NonOptimized primary access state..
1522 */
1523 core_alua_check_nonop_delay(se_cmd);
1524
a6360785 1525 transport_handle_cdb_direct(se_cmd);
d6dfc868 1526 return 0;
a6360785 1527}
a026757f
NB		 1528EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1529
1530/*
1531 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1532 *
1533 * @se_cmd: command descriptor to submit
1534 * @se_sess: associated se_sess for endpoint
1535 * @cdb: pointer to SCSI CDB
1536 * @sense: pointer to SCSI sense buffer
1537 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1538 * @data_length: fabric expected data transfer length
1539 * @task_addr: SAM task attribute
1540 * @data_dir: DMA data direction
1541 * @flags: flags for command submission from target_sc_flags_tables
1542 *
649ee054
BVA		 1543 * Task tags are supported if the caller has set @se_cmd->tag.
1544 *
a026757f
NB		 1545 * Returns non zero to signal active I/O shutdown failure. All other
1546 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1547 * but still return zero here.
1548 *
1549 * This may only be called from process context, and also currently
1550 * assumes internal allocation of fabric payload buffer by target-core.
1551 *
1552 * It also assumes interal target core SGL memory allocation.
1553 */
1554int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1555 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1556 u32 data_length, int task_attr, int data_dir, int flags)
1557{
1558 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1559 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1560 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1561}
a6360785
NB		 1562EXPORT_SYMBOL(target_submit_cmd);
1563
9f0d05c2
NB		 1564static void target_complete_tmr_failure(struct work_struct *work)
1565{
1566 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1567
1568 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1569 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1570
1571 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1572}
1573
ea98d7f9
AG		 1574/**
1575 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1576 * for TMR CDBs
1577 *
1578 * @se_cmd: command descriptor to submit
1579 * @se_sess: associated se_sess for endpoint
1580 * @sense: pointer to SCSI sense buffer
1581 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1582 * @fabric_context: fabric context for TMR req
1583 * @tm_type: Type of TM request
c0974f89
NB		 1584 * @gfp: gfp type for caller
1585 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1586 * @flags: submit cmd flags
ea98d7f9
AG		 1587 *
1588 * Callable from all contexts.
1589 **/
1590
c7042cae 1591int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1592 unsigned char *sense, u64 unpacked_lun,
c0974f89 1593 void *fabric_tmr_ptr, unsigned char tm_type,
5261d86c 1594 gfp_t gfp, u64 tag, int flags)
ea98d7f9
AG		 1595{
1596 struct se_portal_group *se_tpg;
1597 int ret;
1598
1599 se_tpg = se_sess->se_tpg;
1600 BUG_ON(!se_tpg);
1601
1602 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1603 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1604 /*
1605 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1606 * allocation failure.
1607 */
c0974f89 1608 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1609 if (ret < 0)
1610 return -ENOMEM;
ea98d7f9 1611
c0974f89
NB		 1612 if (tm_type == TMR_ABORT_TASK)
1613 se_cmd->se_tmr_req->ref_task_tag = tag;
1614
ea98d7f9 1615 /* See target_submit_cmd for commentary */
afc16604 1616 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1617 if (ret) {
1618 core_tmr_release_req(se_cmd->se_tmr_req);
1619 return ret;
1620 }
ea98d7f9 1621
ea98d7f9
AG		 1622 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1623 if (ret) {
9f0d05c2
NB		 1624 /*
1625 * For callback during failure handling, push this work off
1626 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1627 */
1628 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1629 schedule_work(&se_cmd->work);
c7042cae 1630 return 0;
ea98d7f9
AG		 1631 }
1632 transport_generic_handle_tmr(se_cmd);
c7042cae 1633 return 0;
ea98d7f9
AG		 1634}
1635EXPORT_SYMBOL(target_submit_tmr);
1636
cdbb70bb 1637/*
cf572a96 1638 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1639 * has completed.
1640 */
cf572a96 1641bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cb0df4d3
BVA		 1642 __releases(&cmd->t_state_lock)
1643 __acquires(&cmd->t_state_lock)
cdbb70bb 1644{
cdbb70bb
CH		 1645 bool was_active = false;
1646
cf572a96
CH		 1647 if (cmd->transport_state & CMD_T_BUSY) {
1648 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1649 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1650
cf572a96
CH		 1651 pr_debug("cmd %p waiting to complete\n", cmd);
1652 wait_for_completion(&cmd->task_stop_comp);
1653 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1654
1655 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1656 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1657 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1658 was_active = true;
1659 }
1660
cdbb70bb
CH		 1661 return was_active;
1662}
1663
c66ac9db
NB		 1664/*
1665 * Handle SAM-esque emulation for generic transport request failures.
1666 */
de103c93
CH		 1667void transport_generic_request_failure(struct se_cmd *cmd,
1668 sense_reason_t sense_reason)
c66ac9db 1669{
07bde79a
NB		 1670 int ret = 0;
1671
649ee054
BVA		 1672 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1673 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1674 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1675 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1676 cmd->t_state, sense_reason);
d43d6aea 1677 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1678 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1679 (cmd->transport_state & CMD_T_STOP) != 0,
1680 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1681
c66ac9db
NB		 1682 /*
1683 * For SAM Task Attribute emulation for failed struct se_cmd
1684 */
019c4ca6 1685 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1686 /*
1687 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1688 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1689 */
1690 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1691 cmd->transport_complete_callback)
c8e63985 1692 cmd->transport_complete_callback(cmd, false);
c66ac9db 1693
de103c93 1694 switch (sense_reason) {
03e98c9e
NB		 1695 case TCM_NON_EXISTENT_LUN:
1696 case TCM_UNSUPPORTED_SCSI_OPCODE:
1697 case TCM_INVALID_CDB_FIELD:
1698 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1699 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1700 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1701 case TCM_UNKNOWN_MODE_PAGE:
1702 case TCM_WRITE_PROTECTED:
e2397c70 1703 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1704 case TCM_CHECK_CONDITION_ABORT_CMD:
1705 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1706 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1707 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1708 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1709 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1710 break;
de103c93
CH		 1711 case TCM_OUT_OF_RESOURCES:
1712 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1713 break;
03e98c9e 1714 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1715 /*
1716 * No SENSE Data payload for this case, set SCSI Status
1717 * and queue the response to $FABRIC_MOD.
1718 *
1719 * Uses linux/include/scsi/scsi.h SAM status codes defs
1720 */
1721 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1722 /*
1723 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1724 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1725 * CONFLICT STATUS.
1726 *
1727 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1728 */
e3d6f909 1729 if (cmd->se_sess &&
c51c8e7b
HR		 1730 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1731 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1732 cmd->orig_fe_lun, 0x2C,
1733 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1734 }
e5c0d6ad 1735 trace_target_cmd_complete(cmd);
c51c8e7b 1736 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1737 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1738 goto queue_full;
c66ac9db 1739 goto check_stop;
c66ac9db 1740 default:
6708bb27 1741 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1742 cmd->t_task_cdb[0], sense_reason);
1743 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1744 break;
1745 }
f3146437 1746
de103c93 1747 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1748 if (ret == -EAGAIN || ret == -ENOMEM)
1749 goto queue_full;
07bde79a 1750
c66ac9db
NB		 1751check_stop:
1752 transport_lun_remove_cmd(cmd);
06b967e4 1753 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1754 return;
1755
1756queue_full:
e057f533
CH		 1757 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1758 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1759}
2fbff127 1760EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1761
76dde50e 1762void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1763{
de103c93 1764 sense_reason_t ret;
5f41a31d 1765
de103c93
CH		 1766 if (cmd->execute_cmd) {
1767 ret = cmd->execute_cmd(cmd);
1768 if (ret) {
1769 spin_lock_irq(&cmd->t_state_lock);
1770 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1771 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1772
de103c93
CH		 1773 transport_generic_request_failure(cmd, ret);
1774 }
5f41a31d
CH		 1775 }
1776}
1777
aa58b531
NB		 1778static int target_write_prot_action(struct se_cmd *cmd)
1779{
5132d1e6 1780 u32 sectors;
aa58b531
NB		 1781 /*
1782 * Perform WRITE_INSERT of PI using software emulation when backend
1783 * device has PI enabled, if the transport has not already generated
1784 * PI using hardware WRITE_INSERT offload.
1785 */
1786 switch (cmd->prot_op) {
1787 case TARGET_PROT_DOUT_INSERT:
1788 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1789 sbc_dif_generate(cmd);
1790 break;
5132d1e6
NB		 1791 case TARGET_PROT_DOUT_STRIP:
1792 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1793 break;
1794
1795 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1796 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1797 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1798 if (unlikely(cmd->pi_err)) {
1799 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1800 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1801 spin_unlock_irq(&cmd->t_state_lock);
1802 transport_generic_request_failure(cmd, cmd->pi_err);
1803 return -1;
1804 }
1805 break;
aa58b531
NB		 1806 default:
1807 break;
1808 }
1809
1810 return 0;
1811}
1812
019c4ca6 1813static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1814{
1815 struct se_device *dev = cmd->se_dev;
1816
a3541703 1817 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1818 return false;
5f41a31d 1819
c66ac9db 1820 /*
25985edc 1821 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1822 * to allow the passed struct se_cmd list of tasks to the front of the list.
1823 */
5f41a31d 1824 switch (cmd->sam_task_attr) {
68d81f40 1825 case TCM_HEAD_TAG:
9c31820b
RD		 1826 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1827 cmd->t_task_cdb[0]);
019c4ca6 1828 return false;
68d81f40 1829 case TCM_ORDERED_TAG:
33940d09 1830 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1831
9c31820b
RD		 1832 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1833 cmd->t_task_cdb[0]);
5f41a31d 1834
c66ac9db 1835 /*
5f41a31d
CH		 1836 * Execute an ORDERED command if no other older commands
1837 * exist that need to be completed first.
c66ac9db 1838 */
5f41a31d 1839 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1840 return false;
5f41a31d
CH		 1841 break;
1842 default:
c66ac9db
NB		 1843 /*
1844 * For SIMPLE and UNTAGGED Task Attribute commands
1845 */
33940d09 1846 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1847 break;
c66ac9db 1848 }
5f41a31d 1849
019c4ca6
CH		 1850 if (atomic_read(&dev->dev_ordered_sync) == 0)
1851 return false;
c66ac9db 1852
019c4ca6
CH		 1853 spin_lock(&dev->delayed_cmd_lock);
1854 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1855 spin_unlock(&dev->delayed_cmd_lock);
1856
9c31820b
RD		 1857 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1858 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1859 return true;
1860}
1861
1862void target_execute_cmd(struct se_cmd *cmd)
1863{
1864 /*
1865 * If the received CDB has aleady been aborted stop processing it here.
1866 */
4a9a6c8d 1867 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1868 return;
c66ac9db 1869
019c4ca6
CH		 1870 /*
1871 * Determine if frontend context caller is requesting the stopping of
1872 * this command for frontend exceptions.
1873 */
4a9a6c8d 1874 spin_lock_irq(&cmd->t_state_lock);
019c4ca6 1875 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1876 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1877 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1878
1879 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1880 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1881 return;
1882 }
1883
1884 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1885 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1886 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1887
1888 if (target_write_prot_action(cmd))
1889 return;
019c4ca6 1890
1a398b97
NB		 1891 if (target_handle_task_attr(cmd)) {
1892 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1893 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1894 spin_unlock_irq(&cmd->t_state_lock);
1895 return;
1896 }
1897
1898 __target_execute_cmd(cmd);
c66ac9db 1899}
70baf0ab 1900EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1901
5f41a31d
CH		 1902/*
1903 * Process all commands up to the last received ORDERED task attribute which
1904 * requires another blocking boundary
1905 */
1906static void target_restart_delayed_cmds(struct se_device *dev)
1907{
1908 for (;;) {
1909 struct se_cmd *cmd;
1910
1911 spin_lock(&dev->delayed_cmd_lock);
1912 if (list_empty(&dev->delayed_cmd_list)) {
1913 spin_unlock(&dev->delayed_cmd_lock);
1914 break;
1915 }
1916
1917 cmd = list_entry(dev->delayed_cmd_list.next,
1918 struct se_cmd, se_delayed_node);
1919 list_del(&cmd->se_delayed_node);
1920 spin_unlock(&dev->delayed_cmd_lock);
1921
1922 __target_execute_cmd(cmd);
1923
68d81f40 1924 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1925 break;
1926 }
1927}
1928
c66ac9db 1929/*
35e0e757 1930 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1931 * and ordered cmds need to have their tasks added to the execution queue.
1932 */
1933static void transport_complete_task_attr(struct se_cmd *cmd)
1934{
5951146d 1935 struct se_device *dev = cmd->se_dev;
c66ac9db 1936
a3541703 1937 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1938 return;
1939
68d81f40 1940 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1941 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1942 dev->dev_cur_ordered_id++;
9c31820b
RD		 1943 pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
1944 dev->dev_cur_ordered_id);
68d81f40 1945 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1946 dev->dev_cur_ordered_id++;
9c31820b
RD		 1947 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1948 dev->dev_cur_ordered_id);
68d81f40 1949 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1950 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1951
1952 dev->dev_cur_ordered_id++;
9c31820b
RD		 1953 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1954 dev->dev_cur_ordered_id);
c66ac9db 1955 }
c66ac9db 1956
5f41a31d 1957 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1958}
1959
e057f533 1960static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1961{
1962 int ret = 0;
1963
019c4ca6 1964 transport_complete_task_attr(cmd);
e057f533
CH		 1965
1966 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1967 trace_target_cmd_complete(cmd);
e057f533 1968 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1969 goto out;
e057f533 1970 }
07bde79a
NB		 1971
1972 switch (cmd->data_direction) {
1973 case DMA_FROM_DEVICE:
e5c0d6ad 1974 trace_target_cmd_complete(cmd);
07bde79a
NB		 1975 ret = cmd->se_tfo->queue_data_in(cmd);
1976 break;
1977 case DMA_TO_DEVICE:
64577407 1978 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1979 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 1980 break;
07bde79a
NB		 1981 }
1982 /* Fall through for DMA_TO_DEVICE */
1983 case DMA_NONE:
e5c0d6ad 1984 trace_target_cmd_complete(cmd);
07bde79a
NB		 1985 ret = cmd->se_tfo->queue_status(cmd);
1986 break;
1987 default:
1988 break;
1989 }
1990
e057f533
CH		 1991out:
1992 if (ret < 0) {
1993 transport_handle_queue_full(cmd, cmd->se_dev);
1994 return;
1995 }
1996 transport_lun_remove_cmd(cmd);
1997 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1998}
1999
2000static void transport_handle_queue_full(
2001 struct se_cmd *cmd,
e057f533 2002 struct se_device *dev)
07bde79a
NB		 2003{
2004 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 2005 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 2006 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 2007 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2008
2009 schedule_work(&cmd->se_dev->qf_work_queue);
2010}
2011
fdeab852 2012static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2013{
fdeab852
NB		 2014 switch (cmd->prot_op) {
2015 case TARGET_PROT_DIN_STRIP:
2016 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2017 u32 sectors = cmd->data_length >>
2018 ilog2(cmd->se_dev->dev_attrib.block_size);
2019
2020 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2021 sectors, 0, cmd->t_prot_sg,
2022 0);
2023 if (cmd->pi_err)
fdeab852 2024 return true;
bc005869 2025 }
fdeab852 2026 break;
72c03850
NB		 2027 case TARGET_PROT_DIN_INSERT:
2028 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2029 break;
2030
2031 sbc_dif_generate(cmd);
2032 break;
fdeab852
NB		 2033 default:
2034 break;
bc005869
NB		 2035 }
2036
2037 return false;
2038}
2039
35e0e757 2040static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2041{
35e0e757 2042 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2043 int ret;
35e0e757 2044
c66ac9db
NB		 2045 /*
2046 * Check if we need to move delayed/dormant tasks from cmds on the
2047 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2048 * Attribute.
2049 */
019c4ca6
CH		 2050 transport_complete_task_attr(cmd);
2051
07bde79a
NB		 2052 /*
2053 * Check to schedule QUEUE_FULL work, or execute an existing
2054 * cmd->transport_qf_callback()
2055 */
2056 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2057 schedule_work(&cmd->se_dev->qf_work_queue);
2058
c66ac9db 2059 /*
d5829eac 2060 * Check if we need to send a sense buffer from
c66ac9db
NB		 2061 * the struct se_cmd in question.
2062 */
2063 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2064 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2065 ret = transport_send_check_condition_and_sense(
2066 cmd, 0, 1);
2067 if (ret == -EAGAIN || ret == -ENOMEM)
2068 goto queue_full;
2069
2070 transport_lun_remove_cmd(cmd);
2071 transport_cmd_check_stop_to_fabric(cmd);
2072 return;
c66ac9db
NB		 2073 }
2074 /*
25985edc 2075 * Check for a callback, used by amongst other things
a6b0133c 2076 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2077 */
a6b0133c
NB		 2078 if (cmd->transport_complete_callback) {
2079 sense_reason_t rc;
2080
c8e63985 2081 rc = cmd->transport_complete_callback(cmd, true);
a2890087 2082 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
c8e63985
NB		 2083 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2084 !cmd->data_length)
2085 goto queue_rsp;
2086
a6b0133c 2087 return;
a2890087
NB		 2088 } else if (rc) {
2089 ret = transport_send_check_condition_and_sense(cmd,
2090 rc, 0);
2091 if (ret == -EAGAIN || ret == -ENOMEM)
2092 goto queue_full;
a6b0133c 2093
a2890087
NB		 2094 transport_lun_remove_cmd(cmd);
2095 transport_cmd_check_stop_to_fabric(cmd);
2096 return;
2097 }
a6b0133c 2098 }
c66ac9db 2099
c8e63985 2100queue_rsp:
c66ac9db
NB		 2101 switch (cmd->data_direction) {
2102 case DMA_FROM_DEVICE:
4cc987ea
NB		 2103 atomic_long_add(cmd->data_length,
2104 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2105 /*
2106 * Perform READ_STRIP of PI using software emulation when
2107 * backend had PI enabled, if the transport will not be
2108 * performing hardware READ_STRIP offload.
2109 */
fdeab852 2110 if (target_read_prot_action(cmd)) {
bc005869
NB		 2111 ret = transport_send_check_condition_and_sense(cmd,
2112 cmd->pi_err, 0);
2113 if (ret == -EAGAIN || ret == -ENOMEM)
2114 goto queue_full;
2115
2116 transport_lun_remove_cmd(cmd);
2117 transport_cmd_check_stop_to_fabric(cmd);
2118 return;
2119 }
c66ac9db 2120
e5c0d6ad 2121 trace_target_cmd_complete(cmd);
07bde79a 2122 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2123 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2124 goto queue_full;
c66ac9db
NB		 2125 break;
2126 case DMA_TO_DEVICE:
4cc987ea
NB		 2127 atomic_long_add(cmd->data_length,
2128 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2129 /*
2130 * Check if we need to send READ payload for BIDI-COMMAND
2131 */
64577407 2132 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2133 atomic_long_add(cmd->data_length,
2134 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2135 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2136 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2137 goto queue_full;
c66ac9db
NB		 2138 break;
2139 }
2140 /* Fall through for DMA_TO_DEVICE */
2141 case DMA_NONE:
e5c0d6ad 2142 trace_target_cmd_complete(cmd);
07bde79a 2143 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2144 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2145 goto queue_full;
c66ac9db
NB		 2146 break;
2147 default:
2148 break;
2149 }
2150
2151 transport_lun_remove_cmd(cmd);
2152 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2153 return;
2154
2155queue_full:
6708bb27 2156 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2157 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2158 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2159 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2160}
2161
6708bb27 2162static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2163{
ec98f782 2164 struct scatterlist *sg;
ec98f782 2165 int count;
c66ac9db 2166
6708bb27
AG		 2167 for_each_sg(sgl, sg, nents, count)
2168 __free_page(sg_page(sg));
c66ac9db 2169
6708bb27
AG		 2170 kfree(sgl);
2171}
c66ac9db 2172
47e459e6
NB		 2173static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2174{
2175 /*
2176 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2177 * emulation, and free + reset pointers if necessary..
2178 */
2179 if (!cmd->t_data_sg_orig)
2180 return;
2181
2182 kfree(cmd->t_data_sg);
2183 cmd->t_data_sg = cmd->t_data_sg_orig;
2184 cmd->t_data_sg_orig = NULL;
2185 cmd->t_data_nents = cmd->t_data_nents_orig;
2186 cmd->t_data_nents_orig = 0;
2187}
2188
6708bb27
AG		 2189static inline void transport_free_pages(struct se_cmd *cmd)
2190{
5835812f
AM		 2191 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2192 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2193 cmd->t_prot_sg = NULL;
2194 cmd->t_prot_nents = 0;
2195 }
2196
47e459e6 2197 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2198 /*
2199 * Release special case READ buffer payload required for
2200 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2201 */
2202 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2203 transport_free_sgl(cmd->t_bidi_data_sg,
2204 cmd->t_bidi_data_nents);
2205 cmd->t_bidi_data_sg = NULL;
2206 cmd->t_bidi_data_nents = 0;
2207 }
47e459e6 2208 transport_reset_sgl_orig(cmd);
6708bb27 2209 return;
47e459e6
NB		 2210 }
2211 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2212
2213 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2214 cmd->t_data_sg = NULL;
2215 cmd->t_data_nents = 0;
c66ac9db 2216
6708bb27 2217 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2218 cmd->t_bidi_data_sg = NULL;
2219 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2220}
2221
e26d99ae
CH		 2222/**
2223 * transport_release_cmd - free a command
2224 * @cmd: command to free
2225 *
2226 * This routine unconditionally frees a command, and reference counting
2227 * or list removal must be done in the caller.
2228 */
d5ddad41 2229static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2230{
2231 BUG_ON(!cmd->se_tfo);
2232
c8e31f26 2233 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2234 core_tmr_release_req(cmd->se_tmr_req);
2235 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2236 kfree(cmd->t_task_cdb);
2237 /*
7481deb4
NB		 2238 * If this cmd has been setup with target_get_sess_cmd(), drop
2239 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2240 */
afc16604 2241 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2242}
2243
d3df7825
CH		 2244/**
2245 * transport_put_cmd - release a reference to a command
2246 * @cmd: command to release
2247 *
2248 * This routine releases our reference to the command and frees it if possible.
2249 */
d5ddad41 2250static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2251{
c66ac9db 2252 transport_free_pages(cmd);
d5ddad41 2253 return transport_release_cmd(cmd);
c66ac9db 2254}
c66ac9db 2255
4949314c 2256void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2257{
ec98f782 2258 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2259 struct page **pages;
2260 int i;
05d1c7c0
AG		 2261
2262 /*
ec98f782
AG		 2263 * We need to take into account a possible offset here for fabrics like
2264 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2265 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2266 */
4949314c
AG		 2267 if (!cmd->t_data_nents)
2268 return NULL;
3717ef0c
PB		 2269
2270 BUG_ON(!sg);
2271 if (cmd->t_data_nents == 1)
4949314c
AG		 2272 return kmap(sg_page(sg)) + sg->offset;
2273
2274 /* >1 page. use vmap */
2275 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2276 if (!pages)
4949314c
AG		 2277 return NULL;
2278
2279 /* convert sg[] to pages[] */
2280 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2281 pages[i] = sg_page(sg);
2282 }
2283
2284 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2285 kfree(pages);
de103c93 2286 if (!cmd->t_data_vmap)
4949314c
AG		 2287 return NULL;
2288
2289 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2290}
4949314c 2291EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2292
4949314c 2293void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2294{
a1edf9cf 2295 if (!cmd->t_data_nents) {
4949314c 2296 return;
a1edf9cf 2297 } else if (cmd->t_data_nents == 1) {
4949314c 2298 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2299 return;
2300 }
4949314c
AG		 2301
2302 vunmap(cmd->t_data_vmap);
2303 cmd->t_data_vmap = NULL;
05d1c7c0 2304}
4949314c 2305EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2306
c5ff8d6b 2307int
20093994
NB		 2308target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2309 bool zero_page)
c66ac9db 2310{
20093994 2311 struct scatterlist *sg;
ec98f782 2312 struct page *page;
20093994
NB		 2313 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2314 unsigned int nent;
ec98f782 2315 int i = 0;
c66ac9db 2316
20093994
NB		 2317 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2318 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2319 if (!sg)
ec98f782 2320 return -ENOMEM;
c66ac9db 2321
20093994 2322 sg_init_table(sg, nent);
9db9da33 2323
ec98f782
AG		 2324 while (length) {
2325 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2326 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2327 if (!page)
2328 goto out;
c66ac9db 2329
20093994 2330 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2331 length -= page_len;
2332 i++;
c66ac9db 2333 }
20093994
NB		 2334 *sgl = sg;
2335 *nents = nent;
c66ac9db 2336 return 0;
c66ac9db 2337
ec98f782 2338out:
d0e27c88 2339 while (i > 0) {
ec98f782 2340 i--;
20093994 2341 __free_page(sg_page(&sg[i]));
c66ac9db 2342 }
20093994 2343 kfree(sg);
ec98f782 2344 return -ENOMEM;
c66ac9db
NB		 2345}
2346
da0f7619 2347/*
b16a35b0
AG		 2348 * Allocate any required resources to execute the command. For writes we
2349 * might not have the payload yet, so notify the fabric via a call to
2350 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2351 */
de103c93
CH		 2352sense_reason_t
2353transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2354{
c66ac9db 2355 int ret = 0;
c8e63985 2356 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2357
5835812f
AM		 2358 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2359 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2360 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2361 cmd->prot_length, true);
2362 if (ret < 0)
2363 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2364 }
2365
c66ac9db
NB		 2366 /*
2367 * Determine is the TCM fabric module has already allocated physical
2368 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2369 * beforehand.
c66ac9db 2370 */
ec98f782
AG		 2371 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2372 cmd->data_length) {
20093994 2373
8cefe07b
NB		 2374 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2375 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2376 u32 bidi_length;
2377
2378 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2379 bidi_length = cmd->t_task_nolb *
2380 cmd->se_dev->dev_attrib.block_size;
2381 else
2382 bidi_length = cmd->data_length;
2383
2384 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2385 &cmd->t_bidi_data_nents,
2386 bidi_length, zero_flag);
2387 if (ret < 0)
2388 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2389 }
2390
20093994
NB		 2391 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2392 cmd->data_length, zero_flag);
c66ac9db 2393 if (ret < 0)
de103c93 2394 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2395 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2396 cmd->data_length) {
2397 /*
2398 * Special case for COMPARE_AND_WRITE with fabrics
2399 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2400 */
2401 u32 caw_length = cmd->t_task_nolb *
2402 cmd->se_dev->dev_attrib.block_size;
2403
2404 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2405 &cmd->t_bidi_data_nents,
2406 caw_length, zero_flag);
2407 if (ret < 0)
2408 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2409 }
c66ac9db 2410 /*
c3196f0c
CH		 2411 * If this command is not a write we can execute it right here,
2412 * for write buffers we need to notify the fabric driver first
2413 * and let it call back once the write buffers are ready.
c66ac9db 2414 */
5f41a31d 2415 target_add_to_state_list(cmd);
885e7b0e 2416 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2417 target_execute_cmd(cmd);
2418 return 0;
2419 }
862e6389 2420 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2421
2422 ret = cmd->se_tfo->write_pending(cmd);
2423 if (ret == -EAGAIN || ret == -ENOMEM)
2424 goto queue_full;
2425
de103c93
CH		 2426 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2427 WARN_ON(ret);
2428
b69c1fcf 2429 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2430
c3196f0c
CH		 2431queue_full:
2432 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2433 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2434 transport_handle_queue_full(cmd, cmd->se_dev);
2435 return 0;
c66ac9db 2436}
a1d8b49a 2437EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2438
e057f533 2439static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2440{
f147abb4
NB		 2441 int ret;
2442
2443 ret = cmd->se_tfo->write_pending(cmd);
2444 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2445 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2446 cmd);
2447 transport_handle_queue_full(cmd, cmd->se_dev);
2448 }
07bde79a
NB		 2449}
2450
d5ddad41 2451int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2452{
c130480b 2453 unsigned long flags;
d5ddad41
NB		 2454 int ret = 0;
2455
d14921d6 2456 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2457 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2458 transport_wait_for_tasks(cmd);
2459
d5ddad41 2460 ret = transport_release_cmd(cmd);
d14921d6
NB		 2461 } else {
2462 if (wait_for_tasks)
2463 transport_wait_for_tasks(cmd);
c130480b
NB		 2464 /*
2465 * Handle WRITE failure case where transport_generic_new_cmd()
2466 * has already added se_cmd to state_list, but fabric has
2467 * failed command before I/O submission.
2468 */
2469 if (cmd->state_active) {
2470 spin_lock_irqsave(&cmd->t_state_lock, flags);
2471 target_remove_from_state_list(cmd);
2472 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2473 }
d14921d6 2474
82f1c8a4 2475 if (cmd->se_lun)
c66ac9db 2476 transport_lun_remove_cmd(cmd);
c66ac9db 2477
d5ddad41 2478 ret = transport_put_cmd(cmd);
c66ac9db 2479 }
d5ddad41 2480 return ret;
c66ac9db
NB		 2481}
2482EXPORT_SYMBOL(transport_generic_free_cmd);
2483
a17f091d 2484/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2485 * @se_cmd: command descriptor to add
a6360785 2486 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2487 */
afc16604 2488int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2489{
afc16604 2490 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2491 unsigned long flags;
bc187ea6 2492 int ret = 0;
a17f091d 2493
a6360785
NB		 2494 /*
2495 * Add a second kref if the fabric caller is expecting to handle
2496 * fabric acknowledgement that requires two target_put_sess_cmd()
2497 * invocations before se_cmd descriptor release.
2498 */
054922bb 2499 if (ack_kref)
a6360785 2500 kref_get(&se_cmd->cmd_kref);
7481deb4 2501
a17f091d 2502 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2503 if (se_sess->sess_tearing_down) {
2504 ret = -ESHUTDOWN;
2505 goto out;
2506 }
a17f091d 2507 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2508out:
a17f091d 2509 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2510
2511 if (ret && ack_kref)
afc16604 2512 target_put_sess_cmd(se_cmd);
7544e597 2513
bc187ea6 2514 return ret;
a17f091d 2515}
20361e69 2516EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2517
7481deb4 2518static void target_release_cmd_kref(struct kref *kref)
077aa3b2 2519 __releases(&se_cmd->se_sess->sess_cmd_lock)
a17f091d 2520{
7481deb4
NB		 2521 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2522 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2523
a17f091d 2524 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2525 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2526 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2527 return;
a17f091d 2528 }
a17f091d 2529 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2530 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2531 complete(&se_cmd->cmd_wait_comp);
7481deb4 2532 return;
a17f091d
NB		 2533 }
2534 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2535 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2536
7481deb4
NB		 2537 se_cmd->se_tfo->release_cmd(se_cmd);
2538}
2539
2540/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2541 * @se_cmd: command descriptor to drop
2542 */
afc16604 2543int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2544{
afc16604
BVA		 2545 struct se_session *se_sess = se_cmd->se_sess;
2546
0ed6e189
NB		 2547 if (!se_sess) {
2548 se_cmd->se_tfo->release_cmd(se_cmd);
2549 return 1;
2550 }
ccf5ae83
JE		 2551 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2552 &se_sess->sess_cmd_lock);
a17f091d
NB		 2553}
2554EXPORT_SYMBOL(target_put_sess_cmd);
2555
1c7b13fe
RD		 2556/* target_sess_cmd_list_set_waiting - Flag all commands in
2557 * sess_cmd_list to complete cmd_wait_comp. Set
2558 * sess_tearing_down so no more commands are queued.
2559 * @se_sess: session to flag
a17f091d 2560 */
1c7b13fe 2561void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2562{
2563 struct se_cmd *se_cmd;
2564 unsigned long flags;
2565
a17f091d 2566 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2567 if (se_sess->sess_tearing_down) {
2568 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2569 return;
2570 }
1c7b13fe 2571 se_sess->sess_tearing_down = 1;
9b31a328 2572 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2573
9b31a328 2574 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2575 se_cmd->cmd_wait_set = 1;
2576
2577 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2578}
1c7b13fe 2579EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2580
2581/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2582 * @se_sess: session to wait for active I/O
a17f091d 2583 */
be646c2d 2584void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2585{
2586 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2587 unsigned long flags;
a17f091d
NB		 2588
2589 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2590 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2591 list_del(&se_cmd->se_cmd_list);
2592
2593 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2594 " %d\n", se_cmd, se_cmd->t_state,
2595 se_cmd->se_tfo->get_cmd_state(se_cmd));
2596
be646c2d
JE		 2597 wait_for_completion(&se_cmd->cmd_wait_comp);
2598 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2599 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2600 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2601
2602 se_cmd->se_tfo->release_cmd(se_cmd);
2603 }
9b31a328
NB		 2604
2605 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2606 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2607 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2608
a17f091d
NB		 2609}
2610EXPORT_SYMBOL(target_wait_for_sess_cmds);
2611
b3eeea66 2612void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2613{
5277797d 2614 percpu_ref_kill(&lun->lun_ref);
5277797d 2615 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2616}
2617
d14921d6
NB		 2618/**
2619 * transport_wait_for_tasks - wait for completion to occur
2620 * @cmd: command to wait
c66ac9db 2621 *
d14921d6
NB		 2622 * Called from frontend fabric context to wait for storage engine
2623 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2624 */
a17f091d 2625bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2626{
2627 unsigned long flags;
2628
a1d8b49a 2629 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2630 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2631 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2632 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2633 return false;
d14921d6 2634 }
cb4f4d3c 2635
c8e31f26
AG		 2636 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2637 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2638 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2639 return false;
d14921d6 2640 }
7d680f3b 2641
3d28934a 2642 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2643 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2644 return false;
d14921d6 2645 }
c66ac9db 2646
7d680f3b 2647 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2648
649ee054
BVA		 2649 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d, t_state: %d, CMD_T_STOP\n",
2650 cmd, cmd->tag, cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2651
a1d8b49a 2652 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2653
a1d8b49a 2654 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2655
a1d8b49a 2656 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2657 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2658
649ee054
BVA		 2659 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->t_transport_stop_comp) for ITT: 0x%08llx\n",
2660 cmd->tag);
c66ac9db 2661
d14921d6 2662 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2663
2664 return true;
c66ac9db 2665}
d14921d6 2666EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2667
ab78fef4
BVA		 2668struct sense_info {
2669 u8 key;
2670 u8 asc;
2671 u8 ascq;
2672 bool add_sector_info;
2673};
2674
2675static const struct sense_info sense_info_table[] = {
2676 [TCM_NO_SENSE] = {
2677 .key = NOT_READY
2678 },
2679 [TCM_NON_EXISTENT_LUN] = {
2680 .key = ILLEGAL_REQUEST,
2681 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2682 },
2683 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2684 .key = ILLEGAL_REQUEST,
2685 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2686 },
2687 [TCM_SECTOR_COUNT_TOO_MANY] = {
2688 .key = ILLEGAL_REQUEST,
2689 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2690 },
2691 [TCM_UNKNOWN_MODE_PAGE] = {
2692 .key = ILLEGAL_REQUEST,
2693 .asc = 0x24, /* INVALID FIELD IN CDB */
2694 },
2695 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2696 .key = ABORTED_COMMAND,
2697 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2698 .ascq = 0x03,
2699 },
2700 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2701 .key = ABORTED_COMMAND,
2702 .asc = 0x0c, /* WRITE ERROR */
2703 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2704 },
2705 [TCM_INVALID_CDB_FIELD] = {
2706 .key = ILLEGAL_REQUEST,
2707 .asc = 0x24, /* INVALID FIELD IN CDB */
2708 },
2709 [TCM_INVALID_PARAMETER_LIST] = {
2710 .key = ILLEGAL_REQUEST,
2711 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2712 },
2713 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2714 .key = ILLEGAL_REQUEST,
2715 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2716 },
2717 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2718 .key = ILLEGAL_REQUEST,
2719 .asc = 0x0c, /* WRITE ERROR */
2720 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2721 },
2722 [TCM_SERVICE_CRC_ERROR] = {
2723 .key = ABORTED_COMMAND,
2724 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2725 .ascq = 0x05, /* N/A */
2726 },
2727 [TCM_SNACK_REJECTED] = {
2728 .key = ABORTED_COMMAND,
2729 .asc = 0x11, /* READ ERROR */
2730 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2731 },
2732 [TCM_WRITE_PROTECTED] = {
2733 .key = DATA_PROTECT,
2734 .asc = 0x27, /* WRITE PROTECTED */
2735 },
2736 [TCM_ADDRESS_OUT_OF_RANGE] = {
2737 .key = ILLEGAL_REQUEST,
2738 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2739 },
2740 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2741 .key = UNIT_ATTENTION,
2742 },
2743 [TCM_CHECK_CONDITION_NOT_READY] = {
2744 .key = NOT_READY,
2745 },
2746 [TCM_MISCOMPARE_VERIFY] = {
2747 .key = MISCOMPARE,
2748 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2749 .ascq = 0x00,
2750 },
2751 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2752 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2753 .asc = 0x10,
2754 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2755 .add_sector_info = true,
2756 },
2757 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2758 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2759 .asc = 0x10,
2760 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2761 .add_sector_info = true,
2762 },
2763 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2764 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2765 .asc = 0x10,
2766 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2767 .add_sector_info = true,
2768 },
2769 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2770 /*
2771 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2772 * Solaris initiators. Returning NOT READY instead means the
2773 * operations will be retried a finite number of times and we
2774 * can survive intermittent errors.
2775 */
2776 .key = NOT_READY,
2777 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2778 },
2779};
2780
f5a8b3a7 2781static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2782{
2783 const struct sense_info *si;
2784 u8 *buffer = cmd->sense_buffer;
2785 int r = (__force int)reason;
2786 u8 asc, ascq;
4e4937e8 2787 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 2788
2789 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2790 si = &sense_info_table[r];
2791 else
2792 si = &sense_info_table[(__force int)
2793 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2794
ab78fef4
BVA		 2795 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2796 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2797 WARN_ON_ONCE(asc == 0);
2798 } else if (si->asc == 0) {
2799 WARN_ON_ONCE(cmd->scsi_asc == 0);
2800 asc = cmd->scsi_asc;
2801 ascq = cmd->scsi_ascq;
2802 } else {
2803 asc = si->asc;
2804 ascq = si->ascq;
2805 }
9ec1e1ce 2806
4e4937e8 2807 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 2808 if (si->add_sector_info)
f5a8b3a7
SG		 2809 return scsi_set_sense_information(buffer,
2810 cmd->scsi_sense_length,
2811 cmd->bad_sector);
2812
2813 return 0;
ab78fef4
BVA		 2814}
2815
de103c93
CH		 2816int
2817transport_send_check_condition_and_sense(struct se_cmd *cmd,
2818 sense_reason_t reason, int from_transport)
c66ac9db 2819{
c66ac9db 2820 unsigned long flags;
c66ac9db 2821
a1d8b49a 2822 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2823 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2824 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2825 return 0;
2826 }
2827 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2828 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2829
ab78fef4 2830 if (!from_transport) {
f5a8b3a7
SG		 2831 int rc;
2832
c66ac9db 2833 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 2834 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2835 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 2836 rc = translate_sense_reason(cmd, reason);
2837 if (rc)
2838 return rc;
c66ac9db 2839 }
c66ac9db 2840
e5c0d6ad 2841 trace_target_cmd_complete(cmd);
07bde79a 2842 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2843}
2844EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2845
2846int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2847{
c18bc7d8
RD		 2848 if (!(cmd->transport_state & CMD_T_ABORTED))
2849 return 0;
c66ac9db 2850
68259b5a
AL		 2851 /*
2852 * If cmd has been aborted but either no status is to be sent or it has
2853 * already been sent, just return
2854 */
2855 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
c18bc7d8 2856 return 1;
8b1e1244 2857
649ee054
BVA		 2858 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08llx\n",
2859 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2860
68259b5a 2861 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2862 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2863 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2864 cmd->se_tfo->queue_status(cmd);
2865
2866 return 1;
c66ac9db
NB		 2867}
2868EXPORT_SYMBOL(transport_check_aborted_status);
2869
2870void transport_send_task_abort(struct se_cmd *cmd)
2871{
c252f003
NB		 2872 unsigned long flags;
2873
2874 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2875 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2876 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2877 return;
2878 }
2879 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2880
c66ac9db
NB		 2881 /*
2882 * If there are still expected incoming fabric WRITEs, we wait
2883 * until until they have completed before sending a TASK_ABORTED
2884 * response. This response with TASK_ABORTED status will be
2885 * queued back to fabric module by transport_check_aborted_status().
2886 */
2887 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2888 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2889 cmd->transport_state |= CMD_T_ABORTED;
68259b5a 2890 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
29f4c090 2891 return;
c66ac9db
NB		 2892 }
2893 }
2894 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2895
72b59d6e
RD		 2896 transport_lun_remove_cmd(cmd);
2897
649ee054
BVA		 2898 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
2899 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2900
e5c0d6ad 2901 trace_target_cmd_complete(cmd);
e3d6f909 2902 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2903}
2904
af877292 2905static void target_tmr_work(struct work_struct *work)
c66ac9db 2906{
af877292 2907 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2908 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2909 struct se_tmr_req *tmr = cmd->se_tmr_req;
2910 int ret;
2911
2912 switch (tmr->function) {
5c6cd613 2913 case TMR_ABORT_TASK:
3d28934a 2914 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2915 break;
5c6cd613
NB		 2916 case TMR_ABORT_TASK_SET:
2917 case TMR_CLEAR_ACA:
2918 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2919 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2920 break;
5c6cd613 2921 case TMR_LUN_RESET:
c66ac9db
NB		 2922 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2923 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2924 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 2925 if (tmr->response == TMR_FUNCTION_COMPLETE) {
2926 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
2927 cmd->orig_fe_lun, 0x29,
2928 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
2929 }
c66ac9db 2930 break;
5c6cd613 2931 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2932 tmr->response = TMR_FUNCTION_REJECTED;
2933 break;
5c6cd613 2934 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2935 tmr->response = TMR_FUNCTION_REJECTED;
2936 break;
c66ac9db 2937 default:
6708bb27 2938 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2939 tmr->function);
2940 tmr->response = TMR_FUNCTION_REJECTED;
2941 break;
2942 }
2943
2944 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2945 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2946
b7b8bef7 2947 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2948}
2949
af877292
CH		 2950int transport_generic_handle_tmr(
2951 struct se_cmd *cmd)
c66ac9db 2952{
f15e9cd9
NB		 2953 unsigned long flags;
2954
2955 spin_lock_irqsave(&cmd->t_state_lock, flags);
2956 cmd->transport_state |= CMD_T_ACTIVE;
2957 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2958
af877292
CH		 2959 INIT_WORK(&cmd->work, target_tmr_work);
2960 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2961 return 0;
2962}
af877292 2963EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 2964
2965bool
2966target_check_wce(struct se_device *dev)
2967{
2968 bool wce = false;
2969
2970 if (dev->transport->get_write_cache)
2971 wce = dev->transport->get_write_cache(dev);
2972 else if (dev->dev_attrib.emulate_write_cache > 0)
2973 wce = true;
2974
2975 return wce;
2976}
2977
2978bool
2979target_check_fua(struct se_device *dev)
2980{
2981 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
2982}
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