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x86/msr-index: Cleanup bit defines
[mirror_ubuntu-bionic-kernel.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
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);
fa7e25cf 67static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason);
07bde79a 68static void transport_handle_queue_full(struct se_cmd *cmd,
fa7e25cf 69 struct se_device *dev, int err, bool write_pending);
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);
e70beee7 242 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 243
244 return se_sess;
245}
246EXPORT_SYMBOL(transport_init_session);
247
c0add7fd
NB		 248int transport_alloc_session_tags(struct se_session *se_sess,
249 unsigned int tag_num, unsigned int tag_size)
250{
251 int rc;
252
8c7f6e9b 253 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
dcda9b04 254 GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL);
c0add7fd 255 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 256 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
257 if (!se_sess->sess_cmd_map) {
258 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
259 return -ENOMEM;
260 }
c0add7fd
NB		 261 }
262
263 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
264 if (rc < 0) {
265 pr_err("Unable to init se_sess->sess_tag_pool,"
266 " tag_num: %u\n", tag_num);
de64d3a6 267 kvfree(se_sess->sess_cmd_map);
c0add7fd
NB		 268 se_sess->sess_cmd_map = NULL;
269 return -ENOMEM;
270 }
271
272 return 0;
273}
274EXPORT_SYMBOL(transport_alloc_session_tags);
275
276struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 277 unsigned int tag_size,
278 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 279{
280 struct se_session *se_sess;
281 int rc;
282
7861728d
NB		 283 if (tag_num != 0 && !tag_size) {
284 pr_err("init_session_tags called with percpu-ida tag_num:"
285 " %u, but zero tag_size\n", tag_num);
286 return ERR_PTR(-EINVAL);
287 }
288 if (!tag_num && tag_size) {
289 pr_err("init_session_tags called with percpu-ida tag_size:"
290 " %u, but zero tag_num\n", tag_size);
291 return ERR_PTR(-EINVAL);
292 }
293
e70beee7 294 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 295 if (IS_ERR(se_sess))
296 return se_sess;
297
298 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
299 if (rc < 0) {
300 transport_free_session(se_sess);
301 return ERR_PTR(-ENOMEM);
302 }
303
304 return se_sess;
305}
306EXPORT_SYMBOL(transport_init_session_tags);
307
c66ac9db 308/*
140854cb 309 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 310 */
311void __transport_register_session(
312 struct se_portal_group *se_tpg,
313 struct se_node_acl *se_nacl,
314 struct se_session *se_sess,
315 void *fabric_sess_ptr)
316{
9ac8928e 317 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 318 unsigned char buf[PR_REG_ISID_LEN];
319
320 se_sess->se_tpg = se_tpg;
321 se_sess->fabric_sess_ptr = fabric_sess_ptr;
322 /*
323 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
324 *
325 * Only set for struct se_session's that will actually be moving I/O.
326 * eg: *NOT* discovery sessions.
327 */
328 if (se_nacl) {
bffb5128
NB		 329 /*
330 *
331 * Determine if fabric allows for T10-PI feature bits exposed to
332 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
333 *
334 * If so, then always save prot_type on a per se_node_acl node
335 * basis and re-instate the previous sess_prot_type to avoid
336 * disabling PI from below any previously initiator side
337 * registered LUNs.
338 */
339 if (se_nacl->saved_prot_type)
340 se_sess->sess_prot_type = se_nacl->saved_prot_type;
341 else if (tfo->tpg_check_prot_fabric_only)
342 se_sess->sess_prot_type = se_nacl->saved_prot_type =
343 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 344 /*
345 * If the fabric module supports an ISID based TransportID,
346 * save this value in binary from the fabric I_T Nexus now.
347 */
e3d6f909 348 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 349 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 350 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 351 &buf[0], PR_REG_ISID_LEN);
352 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
353 }
afb999ff 354
c66ac9db
NB		 355 spin_lock_irq(&se_nacl->nacl_sess_lock);
356 /*
357 * The se_nacl->nacl_sess pointer will be set to the
358 * last active I_T Nexus for each struct se_node_acl.
359 */
360 se_nacl->nacl_sess = se_sess;
361
362 list_add_tail(&se_sess->sess_acl_list,
363 &se_nacl->acl_sess_list);
364 spin_unlock_irq(&se_nacl->nacl_sess_lock);
365 }
366 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
367
6708bb27 368 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 369 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 370}
371EXPORT_SYMBOL(__transport_register_session);
372
373void transport_register_session(
374 struct se_portal_group *se_tpg,
375 struct se_node_acl *se_nacl,
376 struct se_session *se_sess,
377 void *fabric_sess_ptr)
378{
140854cb
NB		 379 unsigned long flags;
380
381 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 382 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 383 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 384}
385EXPORT_SYMBOL(transport_register_session);
386
7861728d
NB		 387struct se_session *
388target_alloc_session(struct se_portal_group *tpg,
389 unsigned int tag_num, unsigned int tag_size,
390 enum target_prot_op prot_op,
391 const char *initiatorname, void *private,
392 int (*callback)(struct se_portal_group *,
393 struct se_session *, void *))
394{
395 struct se_session *sess;
396
397 /*
398 * If the fabric driver is using percpu-ida based pre allocation
399 * of I/O descriptor tags, go ahead and perform that setup now..
400 */
401 if (tag_num != 0)
402 sess = transport_init_session_tags(tag_num, tag_size, prot_op);
403 else
404 sess = transport_init_session(prot_op);
405
406 if (IS_ERR(sess))
407 return sess;
408
409 sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg,
410 (unsigned char *)initiatorname);
411 if (!sess->se_node_acl) {
412 transport_free_session(sess);
413 return ERR_PTR(-EACCES);
414 }
415 /*
416 * Go ahead and perform any remaining fabric setup that is
417 * required before transport_register_session().
418 */
419 if (callback != NULL) {
420 int rc = callback(tpg, sess, private);
421 if (rc) {
422 transport_free_session(sess);
423 return ERR_PTR(rc);
424 }
425 }
426
427 transport_register_session(tpg, sess->se_node_acl, sess, private);
428 return sess;
429}
430EXPORT_SYMBOL(target_alloc_session);
431
f8e471f9
NB		 432ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
433{
434 struct se_session *se_sess;
435 ssize_t len = 0;
436
437 spin_lock_bh(&se_tpg->session_lock);
438 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
439 if (!se_sess->se_node_acl)
440 continue;
441 if (!se_sess->se_node_acl->dynamic_node_acl)
442 continue;
443 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
444 break;
445
446 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
447 se_sess->se_node_acl->initiatorname);
448 len += 1; /* Include NULL terminator */
449 }
450 spin_unlock_bh(&se_tpg->session_lock);
451
452 return len;
453}
454EXPORT_SYMBOL(target_show_dynamic_sessions);
455
afb999ff
NB		 456static void target_complete_nacl(struct kref *kref)
457{
458 struct se_node_acl *nacl = container_of(kref,
459 struct se_node_acl, acl_kref);
01d4d673 460 struct se_portal_group *se_tpg = nacl->se_tpg;
afb999ff 461
01d4d673
NB		 462 if (!nacl->dynamic_stop) {
463 complete(&nacl->acl_free_comp);
464 return;
465 }
466
467 mutex_lock(&se_tpg->acl_node_mutex);
6f48655f 468 list_del_init(&nacl->acl_list);
01d4d673
NB		 469 mutex_unlock(&se_tpg->acl_node_mutex);
470
471 core_tpg_wait_for_nacl_pr_ref(nacl);
472 core_free_device_list_for_node(nacl, se_tpg);
473 kfree(nacl);
afb999ff
NB		 474}
475
476void target_put_nacl(struct se_node_acl *nacl)
477{
478 kref_put(&nacl->acl_kref, target_complete_nacl);
479}
21aaa23b 480EXPORT_SYMBOL(target_put_nacl);
afb999ff 481
c66ac9db
NB		 482void transport_deregister_session_configfs(struct se_session *se_sess)
483{
484 struct se_node_acl *se_nacl;
23388864 485 unsigned long flags;
c66ac9db
NB		 486 /*
487 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
488 */
489 se_nacl = se_sess->se_node_acl;
6708bb27 490 if (se_nacl) {
23388864 491 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
fba81f88
CH		 492 if (!list_empty(&se_sess->sess_acl_list))
493 list_del_init(&se_sess->sess_acl_list);
c66ac9db
NB		 494 /*
495 * If the session list is empty, then clear the pointer.
496 * Otherwise, set the struct se_session pointer from the tail
497 * element of the per struct se_node_acl active session list.
498 */
499 if (list_empty(&se_nacl->acl_sess_list))
500 se_nacl->nacl_sess = NULL;
501 else {
502 se_nacl->nacl_sess = container_of(
503 se_nacl->acl_sess_list.prev,
504 struct se_session, sess_acl_list);
505 }
23388864 506 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 507 }
508}
509EXPORT_SYMBOL(transport_deregister_session_configfs);
510
511void transport_free_session(struct se_session *se_sess)
512{
21aaa23b 513 struct se_node_acl *se_nacl = se_sess->se_node_acl;
01d4d673 514
21aaa23b
NB		 515 /*
516 * Drop the se_node_acl->nacl_kref obtained from within
517 * core_tpg_get_initiator_node_acl().
518 */
519 if (se_nacl) {
01d4d673
NB		 520 struct se_portal_group *se_tpg = se_nacl->se_tpg;
521 const struct target_core_fabric_ops *se_tfo = se_tpg->se_tpg_tfo;
522 unsigned long flags;
523
21aaa23b 524 se_sess->se_node_acl = NULL;
01d4d673
NB		 525
526 /*
527 * Also determine if we need to drop the extra ->cmd_kref if
528 * it had been previously dynamically generated, and
529 * the endpoint is not caching dynamic ACLs.
530 */
531 mutex_lock(&se_tpg->acl_node_mutex);
532 if (se_nacl->dynamic_node_acl &&
533 !se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
534 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
535 if (list_empty(&se_nacl->acl_sess_list))
536 se_nacl->dynamic_stop = true;
537 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
538
539 if (se_nacl->dynamic_stop)
6f48655f 540 list_del_init(&se_nacl->acl_list);
01d4d673
NB		 541 }
542 mutex_unlock(&se_tpg->acl_node_mutex);
543
544 if (se_nacl->dynamic_stop)
545 target_put_nacl(se_nacl);
546
21aaa23b
NB		 547 target_put_nacl(se_nacl);
548 }
c0add7fd
NB		 549 if (se_sess->sess_cmd_map) {
550 percpu_ida_destroy(&se_sess->sess_tag_pool);
de64d3a6 551 kvfree(se_sess->sess_cmd_map);
c0add7fd 552 }
c66ac9db
NB		 553 kmem_cache_free(se_sess_cache, se_sess);
554}
555EXPORT_SYMBOL(transport_free_session);
556
557void transport_deregister_session(struct se_session *se_sess)
558{
559 struct se_portal_group *se_tpg = se_sess->se_tpg;
e63a8e19 560 unsigned long flags;
c66ac9db 561
6708bb27 562 if (!se_tpg) {
c66ac9db
NB		 563 transport_free_session(se_sess);
564 return;
565 }
c66ac9db 566
e63a8e19 567 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 568 list_del(&se_sess->sess_list);
569 se_sess->se_tpg = NULL;
570 se_sess->fabric_sess_ptr = NULL;
e63a8e19 571 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db 572
6708bb27 573 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 574 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 575 /*
125d0119 576 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff 577 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
21aaa23b 578 * removal context from within transport_free_session() code.
01d4d673
NB		 579 *
580 * For dynamic ACL, target_put_nacl() uses target_complete_nacl()
581 * to release all remaining generate_node_acl=1 created ACL resources.
01468346 582 */
01468346 583
afb999ff 584 transport_free_session(se_sess);
c66ac9db
NB		 585}
586EXPORT_SYMBOL(transport_deregister_session);
587
cf572a96 588static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 589{
42bf829e 590 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 591 unsigned long flags;
592
42bf829e
CH		 593 if (!dev)
594 return;
c66ac9db 595
cf572a96
CH		 596 spin_lock_irqsave(&dev->execute_task_lock, flags);
597 if (cmd->state_active) {
598 list_del(&cmd->state_list);
cf572a96 599 cmd->state_active = false;
c66ac9db 600 }
cf572a96 601 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 602}
603
b1a2ecda 604static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
c66ac9db
NB		 605{
606 unsigned long flags;
607
b1a2ecda 608 target_remove_from_state_list(cmd);
f7113a47 609
b1a2ecda
BVA		 610 /*
611 * Clear struct se_cmd->se_lun before the handoff to FE.
612 */
613 cmd->se_lun = NULL;
f7113a47 614
febe562c 615 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 616 /*
617 * Determine if frontend context caller is requesting the stopping of
e3d6f909 618 * this command for frontend exceptions.
c66ac9db 619 */
7d680f3b 620 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 621 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
622 __func__, __LINE__, cmd->tag);
c66ac9db 623
a1d8b49a 624 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 625
a95d6511 626 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 627 return 1;
628 }
f7113a47 629 cmd->transport_state &= ~CMD_T_ACTIVE;
a1d8b49a 630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 631
b1a2ecda
BVA		 632 /*
633 * Some fabric modules like tcm_loop can release their internally
634 * allocated I/O reference and struct se_cmd now.
635 *
636 * Fabric modules are expected to return '1' here if the se_cmd being
637 * passed is released at this point, or zero if not being released.
638 */
9c28ca4f 639 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 640}
641
642static void transport_lun_remove_cmd(struct se_cmd *cmd)
643{
e3d6f909 644 struct se_lun *lun = cmd->se_lun;
c66ac9db 645
5259a06e 646 if (!lun)
c66ac9db
NB		 647 return;
648
5259a06e
NB		 649 if (cmpxchg(&cmd->lun_ref_active, true, false))
650 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 651}
652
73d4e580 653int transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
c66ac9db 654{
febe562c 655 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
73d4e580 656 int ret = 0;
febe562c 657
68259b5a
AL		 658 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
659 transport_lun_remove_cmd(cmd);
131e6abc
NB		 660 /*
661 * Allow the fabric driver to unmap any resources before
662 * releasing the descriptor via TFO->release_cmd()
663 */
664 if (remove)
665 cmd->se_tfo->aborted_task(cmd);
68259b5a 666
c66ac9db 667 if (transport_cmd_check_stop_to_fabric(cmd))
73d4e580 668 return 1;
febe562c 669 if (remove && ack_kref)
c0170698 670 ret = target_put_sess_cmd(cmd);
73d4e580
NB		 671
672 return ret;
c66ac9db
NB		 673}
674
35e0e757
CH		 675static void target_complete_failure_work(struct work_struct *work)
676{
677 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
678
de103c93
CH		 679 transport_generic_request_failure(cmd,
680 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 681}
682
6138ed2a 683/*
d5829eac
PB		 684 * Used when asking transport to copy Sense Data from the underlying
685 * Linux/SCSI struct scsi_cmnd
6138ed2a 686 */
d5829eac 687static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 688{
6138ed2a 689 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 690
691 WARN_ON(!cmd->se_lun);
692
693 if (!dev)
d5829eac 694 return NULL;
6138ed2a 695
d5829eac
PB		 696 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
697 return NULL;
6138ed2a 698
9c58b7dd 699 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 700
d5829eac 701 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 702 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 703 return cmd->sense_buffer;
6138ed2a
PB		 704}
705
c6d66aba
MC		 706void transport_copy_sense_to_cmd(struct se_cmd *cmd, unsigned char *sense)
707{
708 unsigned char *cmd_sense_buf;
709 unsigned long flags;
710
711 spin_lock_irqsave(&cmd->t_state_lock, flags);
712 cmd_sense_buf = transport_get_sense_buffer(cmd);
713 if (!cmd_sense_buf) {
714 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
715 return;
716 }
717
718 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
719 memcpy(cmd_sense_buf, sense, cmd->scsi_sense_length);
720 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
721}
722EXPORT_SYMBOL(transport_copy_sense_to_cmd);
723
5787cacd 724void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 725{
42bf829e 726 struct se_device *dev = cmd->se_dev;
402242c9 727 int success;
c66ac9db 728 unsigned long flags;
c66ac9db 729
5787cacd
CH		 730 cmd->scsi_status = scsi_status;
731
a1d8b49a 732 spin_lock_irqsave(&cmd->t_state_lock, flags);
402242c9
MC		 733 switch (cmd->scsi_status) {
734 case SAM_STAT_CHECK_CONDITION:
d5829eac 735 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 736 success = 1;
402242c9
MC		 737 else
738 success = 0;
739 break;
740 default:
9fe36984 741 success = 1;
402242c9 742 break;
c66ac9db
NB		 743 }
744
3d28934a 745 /*
125d0119 746 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 747 * and transport_wait_for_tasks() will be waiting for completion..
748 */
febe562c 749 if (cmd->transport_state & CMD_T_ABORTED ||
3d28934a
NB		 750 cmd->transport_state & CMD_T_STOP) {
751 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1d6ef276
JY		 752 /*
753 * If COMPARE_AND_WRITE was stopped by __transport_wait_for_tasks(),
754 * release se_device->caw_sem obtained by sbc_compare_and_write()
755 * since target_complete_ok_work() or target_complete_failure_work()
756 * won't be called to invoke the normal CAW completion callbacks.
757 */
758 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
759 up(&dev->caw_sem);
760 }
a95d6511 761 complete_all(&cmd->t_transport_stop_comp);
3d28934a 762 return;
3dca1471 763 } else if (!success) {
35e0e757 764 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 765 } else {
35e0e757 766 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 767 }
35e0e757 768
35e0e757 769 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 770 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 771 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 772
9095adaa 773 if (cmd->se_cmd_flags & SCF_USE_CPUID)
fb3269ba 774 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
9095adaa
QT		 775 else
776 queue_work(target_completion_wq, &cmd->work);
c66ac9db 777}
6bb35e00
CH		 778EXPORT_SYMBOL(target_complete_cmd);
779
2426bd45
RD		 780void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
781{
61f36166 782 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
2426bd45
RD		 783 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
784 cmd->residual_count += cmd->data_length - length;
785 } else {
786 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
787 cmd->residual_count = cmd->data_length - length;
788 }
789
790 cmd->data_length = length;
791 }
792
793 target_complete_cmd(cmd, scsi_status);
794}
795EXPORT_SYMBOL(target_complete_cmd_with_length);
796
cf572a96 797static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 798{
cf572a96
CH		 799 struct se_device *dev = cmd->se_dev;
800 unsigned long flags;
c66ac9db 801
cf572a96
CH		 802 spin_lock_irqsave(&dev->execute_task_lock, flags);
803 if (!cmd->state_active) {
804 list_add_tail(&cmd->state_list, &dev->state_list);
805 cmd->state_active = true;
c66ac9db 806 }
cf572a96 807 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 808}
809
07bde79a 810/*
f147abb4 811 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 812 */
7a6f0a1e
CH		 813static void transport_write_pending_qf(struct se_cmd *cmd);
814static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 815
0fd97ccf 816void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 817{
818 struct se_device *dev = container_of(work, struct se_device,
819 qf_work_queue);
bcac364a 820 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 821 struct se_cmd *cmd, *cmd_tmp;
822
823 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 824 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
825 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 826
bcac364a 827 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 828 list_del(&cmd->se_qf_node);
33940d09 829 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 830
6708bb27 831 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 832 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 833 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 834 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
835 : "UNKNOWN");
f7a5cc0b 836
7a6f0a1e
CH		 837 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
838 transport_write_pending_qf(cmd);
fa7e25cf
NB		 839 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK ||
840 cmd->t_state == TRANSPORT_COMPLETE_QF_ERR)
7a6f0a1e 841 transport_complete_qf(cmd);
07bde79a 842 }
07bde79a
NB		 843}
844
c66ac9db
NB		 845unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
846{
847 switch (cmd->data_direction) {
848 case DMA_NONE:
849 return "NONE";
850 case DMA_FROM_DEVICE:
851 return "READ";
852 case DMA_TO_DEVICE:
853 return "WRITE";
854 case DMA_BIDIRECTIONAL:
855 return "BIDI";
856 default:
857 break;
858 }
859
860 return "UNKNOWN";
861}
862
863void transport_dump_dev_state(
864 struct se_device *dev,
865 char *b,
866 int *bl)
867{
868 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 869 if (dev->export_count)
c66ac9db 870 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 871 else
c66ac9db 872 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 873
5f41a31d 874 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 875 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 876 dev->dev_attrib.block_size,
877 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 878 *bl += sprintf(b + *bl, " ");
879}
880
c66ac9db
NB		 881void transport_dump_vpd_proto_id(
882 struct t10_vpd *vpd,
883 unsigned char *p_buf,
884 int p_buf_len)
885{
886 unsigned char buf[VPD_TMP_BUF_SIZE];
887 int len;
888
889 memset(buf, 0, VPD_TMP_BUF_SIZE);
890 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
891
892 switch (vpd->protocol_identifier) {
893 case 0x00:
894 sprintf(buf+len, "Fibre Channel\n");
895 break;
896 case 0x10:
897 sprintf(buf+len, "Parallel SCSI\n");
898 break;
899 case 0x20:
900 sprintf(buf+len, "SSA\n");
901 break;
902 case 0x30:
903 sprintf(buf+len, "IEEE 1394\n");
904 break;
905 case 0x40:
906 sprintf(buf+len, "SCSI Remote Direct Memory Access"
907 " Protocol\n");
908 break;
909 case 0x50:
910 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
911 break;
912 case 0x60:
913 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
914 break;
915 case 0x70:
916 sprintf(buf+len, "Automation/Drive Interface Transport"
917 " Protocol\n");
918 break;
919 case 0x80:
920 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
921 break;
922 default:
923 sprintf(buf+len, "Unknown 0x%02x\n",
924 vpd->protocol_identifier);
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
934void
935transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
936{
937 /*
938 * Check if the Protocol Identifier Valid (PIV) bit is set..
939 *
940 * from spc3r23.pdf section 7.5.1
941 */
942 if (page_83[1] & 0x80) {
943 vpd->protocol_identifier = (page_83[0] & 0xf0);
944 vpd->protocol_identifier_set = 1;
945 transport_dump_vpd_proto_id(vpd, NULL, 0);
946 }
947}
948EXPORT_SYMBOL(transport_set_vpd_proto_id);
949
950int transport_dump_vpd_assoc(
951 struct t10_vpd *vpd,
952 unsigned char *p_buf,
953 int p_buf_len)
954{
955 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 956 int ret = 0;
957 int len;
c66ac9db
NB		 958
959 memset(buf, 0, VPD_TMP_BUF_SIZE);
960 len = sprintf(buf, "T10 VPD Identifier Association: ");
961
962 switch (vpd->association) {
963 case 0x00:
964 sprintf(buf+len, "addressed logical unit\n");
965 break;
966 case 0x10:
967 sprintf(buf+len, "target port\n");
968 break;
969 case 0x20:
970 sprintf(buf+len, "SCSI target device\n");
971 break;
972 default:
973 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 974 ret = -EINVAL;
c66ac9db
NB		 975 break;
976 }
977
978 if (p_buf)
979 strncpy(p_buf, buf, p_buf_len);
980 else
6708bb27 981 pr_debug("%s", buf);
c66ac9db
NB		 982
983 return ret;
984}
985
986int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
987{
988 /*
989 * The VPD identification association..
990 *
991 * from spc3r23.pdf Section 7.6.3.1 Table 297
992 */
993 vpd->association = (page_83[1] & 0x30);
994 return transport_dump_vpd_assoc(vpd, NULL, 0);
995}
996EXPORT_SYMBOL(transport_set_vpd_assoc);
997
998int transport_dump_vpd_ident_type(
999 struct t10_vpd *vpd,
1000 unsigned char *p_buf,
1001 int p_buf_len)
1002{
1003 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1004 int ret = 0;
1005 int len;
c66ac9db
NB		 1006
1007 memset(buf, 0, VPD_TMP_BUF_SIZE);
1008 len = sprintf(buf, "T10 VPD Identifier Type: ");
1009
1010 switch (vpd->device_identifier_type) {
1011 case 0x00:
1012 sprintf(buf+len, "Vendor specific\n");
1013 break;
1014 case 0x01:
1015 sprintf(buf+len, "T10 Vendor ID based\n");
1016 break;
1017 case 0x02:
1018 sprintf(buf+len, "EUI-64 based\n");
1019 break;
1020 case 0x03:
1021 sprintf(buf+len, "NAA\n");
1022 break;
1023 case 0x04:
1024 sprintf(buf+len, "Relative target port identifier\n");
1025 break;
1026 case 0x08:
1027 sprintf(buf+len, "SCSI name string\n");
1028 break;
1029 default:
1030 sprintf(buf+len, "Unsupported: 0x%02x\n",
1031 vpd->device_identifier_type);
e3d6f909 1032 ret = -EINVAL;
c66ac9db
NB		 1033 break;
1034 }
1035
e3d6f909
AG		 1036 if (p_buf) {
1037 if (p_buf_len < strlen(buf)+1)
1038 return -EINVAL;
c66ac9db 1039 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1040 } else {
6708bb27 1041 pr_debug("%s", buf);
e3d6f909 1042 }
c66ac9db
NB		 1043
1044 return ret;
1045}
1046
1047int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1048{
1049 /*
1050 * The VPD identifier type..
1051 *
1052 * from spc3r23.pdf Section 7.6.3.1 Table 298
1053 */
1054 vpd->device_identifier_type = (page_83[1] & 0x0f);
1055 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1056}
1057EXPORT_SYMBOL(transport_set_vpd_ident_type);
1058
1059int transport_dump_vpd_ident(
1060 struct t10_vpd *vpd,
1061 unsigned char *p_buf,
1062 int p_buf_len)
1063{
1064 unsigned char buf[VPD_TMP_BUF_SIZE];
1065 int ret = 0;
1066
1067 memset(buf, 0, VPD_TMP_BUF_SIZE);
1068
1069 switch (vpd->device_identifier_code_set) {
1070 case 0x01: /* Binary */
703d641d
DC		 1071 snprintf(buf, sizeof(buf),
1072 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1073 &vpd->device_identifier[0]);
1074 break;
1075 case 0x02: /* ASCII */
703d641d
DC		 1076 snprintf(buf, sizeof(buf),
1077 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1078 &vpd->device_identifier[0]);
1079 break;
1080 case 0x03: /* UTF-8 */
703d641d
DC		 1081 snprintf(buf, sizeof(buf),
1082 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1083 &vpd->device_identifier[0]);
1084 break;
1085 default:
1086 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1087 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1088 ret = -EINVAL;
c66ac9db
NB		 1089 break;
1090 }
1091
1092 if (p_buf)
1093 strncpy(p_buf, buf, p_buf_len);
1094 else
6708bb27 1095 pr_debug("%s", buf);
c66ac9db
NB		 1096
1097 return ret;
1098}
1099
1100int
1101transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1102{
1103 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1104 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1105
1106 /*
1107 * The VPD Code Set (encoding)
1108 *
1109 * from spc3r23.pdf Section 7.6.3.1 Table 296
1110 */
1111 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1112 switch (vpd->device_identifier_code_set) {
1113 case 0x01: /* Binary */
1114 vpd->device_identifier[j++] =
1115 hex_str[vpd->device_identifier_type];
1116 while (i < (4 + page_83[3])) {
1117 vpd->device_identifier[j++] =
1118 hex_str[(page_83[i] & 0xf0) >> 4];
1119 vpd->device_identifier[j++] =
1120 hex_str[page_83[i] & 0x0f];
1121 i++;
1122 }
1123 break;
1124 case 0x02: /* ASCII */
1125 case 0x03: /* UTF-8 */
1126 while (i < (4 + page_83[3]))
1127 vpd->device_identifier[j++] = page_83[i++];
1128 break;
1129 default:
1130 break;
1131 }
1132
1133 return transport_dump_vpd_ident(vpd, NULL, 0);
1134}
1135EXPORT_SYMBOL(transport_set_vpd_ident);
1136
8f9b5654
NB		 1137static sense_reason_t
1138target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1139 unsigned int size)
1140{
1141 u32 mtl;
1142
1143 if (!cmd->se_tfo->max_data_sg_nents)
1144 return TCM_NO_SENSE;
1145 /*
1146 * Check if fabric enforced maximum SGL entries per I/O descriptor
1147 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1148 * residual_count and reduce original cmd->data_length to maximum
1149 * length based on single PAGE_SIZE entry scatter-lists.
1150 */
1151 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1152 if (cmd->data_length > mtl) {
1153 /*
1154 * If an existing CDB overflow is present, calculate new residual
1155 * based on CDB size minus fabric maximum transfer length.
1156 *
1157 * If an existing CDB underflow is present, calculate new residual
1158 * based on original cmd->data_length minus fabric maximum transfer
1159 * length.
1160 *
1161 * Otherwise, set the underflow residual based on cmd->data_length
1162 * minus fabric maximum transfer length.
1163 */
1164 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1165 cmd->residual_count = (size - mtl);
1166 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1167 u32 orig_dl = size + cmd->residual_count;
1168 cmd->residual_count = (orig_dl - mtl);
1169 } else {
1170 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1171 cmd->residual_count = (cmd->data_length - mtl);
1172 }
1173 cmd->data_length = mtl;
1174 /*
1175 * Reset sbc_check_prot() calculated protection payload
1176 * length based upon the new smaller MTL.
1177 */
1178 if (cmd->prot_length) {
1179 u32 sectors = (mtl / dev->dev_attrib.block_size);
1180 cmd->prot_length = dev->prot_length * sectors;
1181 }
1182 }
1183 return TCM_NO_SENSE;
1184}
1185
de103c93
CH		 1186sense_reason_t
1187target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1188{
1189 struct se_device *dev = cmd->se_dev;
1190
1191 if (cmd->unknown_data_length) {
1192 cmd->data_length = size;
1193 } else if (size != cmd->data_length) {
4ff83daa 1194 pr_warn_ratelimited("TARGET_CORE[%s]: Expected Transfer Length:"
9b3b8041
CH		 1195 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1196 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1197 cmd->data_length, size, cmd->t_task_cdb[0]);
1198
4ff83daa
NB		 1199 if (cmd->data_direction == DMA_TO_DEVICE) {
1200 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1201 pr_err_ratelimited("Rejecting underflow/overflow"
1202 " for WRITE data CDB\n");
1203 return TCM_INVALID_CDB_FIELD;
1204 }
1205 /*
1206 * Some fabric drivers like iscsi-target still expect to
1207 * always reject overflow writes. Reject this case until
1208 * full fabric driver level support for overflow writes
1209 * is introduced tree-wide.
1210 */
1211 if (size > cmd->data_length) {
1212 pr_err_ratelimited("Rejecting overflow for"
1213 " WRITE control CDB\n");
1214 return TCM_INVALID_CDB_FIELD;
1215 }
9b3b8041
CH		 1216 }
1217 /*
1218 * Reject READ_* or WRITE_* with overflow/underflow for
1219 * type SCF_SCSI_DATA_CDB.
1220 */
0fd97ccf 1221 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1222 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1223 " CDB on non 512-byte sector setup subsystem"
1224 " plugin: %s\n", dev->transport->name);
1225 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1226 return TCM_INVALID_CDB_FIELD;
9b3b8041 1227 }
4c054ba6
NB		 1228 /*
1229 * For the overflow case keep the existing fabric provided
1230 * ->data_length. Otherwise for the underflow case, reset
1231 * ->data_length to the smaller SCSI expected data transfer
1232 * length.
1233 */
9b3b8041
CH		 1234 if (size > cmd->data_length) {
1235 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1236 cmd->residual_count = (size - cmd->data_length);
1237 } else {
1238 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1239 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1240 cmd->data_length = size;
9b3b8041 1241 }
9b3b8041
CH		 1242 }
1243
8f9b5654 1244 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1245
9b3b8041
CH		 1246}
1247
c66ac9db
NB		 1248/*
1249 * Used by fabric modules containing a local struct se_cmd within their
1250 * fabric dependent per I/O descriptor.
649ee054
BVA		 1251 *
1252 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1253 */
1254void transport_init_se_cmd(
1255 struct se_cmd *cmd,
9ac8928e 1256 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1257 struct se_session *se_sess,
1258 u32 data_length,
1259 int data_direction,
1260 int task_attr,
1261 unsigned char *sense_buffer)
1262{
5951146d 1263 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1264 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1265 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1266 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1267 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1268 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1269 spin_lock_init(&cmd->t_state_lock);
f2b72d6a 1270 INIT_WORK(&cmd->work, NULL);
1e1110c4 1271 kref_init(&cmd->cmd_kref);
c66ac9db
NB		 1272
1273 cmd->se_tfo = tfo;
1274 cmd->se_sess = se_sess;
1275 cmd->data_length = data_length;
1276 cmd->data_direction = data_direction;
1277 cmd->sam_task_attr = task_attr;
1278 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1279
1280 cmd->state_active = false;
c66ac9db
NB		 1281}
1282EXPORT_SYMBOL(transport_init_se_cmd);
1283
de103c93
CH		 1284static sense_reason_t
1285transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1286{
019c4ca6
CH		 1287 struct se_device *dev = cmd->se_dev;
1288
c66ac9db
NB		 1289 /*
1290 * Check if SAM Task Attribute emulation is enabled for this
1291 * struct se_device storage object
1292 */
a3541703 1293 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1294 return 0;
1295
68d81f40 1296 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1297 pr_debug("SAM Task Attribute ACA"
c66ac9db 1298 " emulation is not supported\n");
de103c93 1299 return TCM_INVALID_CDB_FIELD;
c66ac9db 1300 }
9c31820b 1301
c66ac9db
NB		 1302 return 0;
1303}
1304
de103c93
CH		 1305sense_reason_t
1306target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1307{
0fd97ccf 1308 struct se_device *dev = cmd->se_dev;
de103c93 1309 sense_reason_t ret;
c66ac9db 1310
c66ac9db
NB		 1311 /*
1312 * Ensure that the received CDB is less than the max (252 + 8) bytes
1313 * for VARIABLE_LENGTH_CMD
1314 */
1315 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1316 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1317 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1318 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1319 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1320 }
1321 /*
1322 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1323 * allocate the additional extended CDB buffer now.. Otherwise
1324 * setup the pointer from __t_task_cdb to t_task_cdb.
1325 */
a1d8b49a
AG		 1326 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1327 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1328 GFP_KERNEL);
6708bb27
AG		 1329 if (!cmd->t_task_cdb) {
1330 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1331 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1332 scsi_command_size(cdb),
a1d8b49a 1333 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1334 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1335 }
1336 } else
a1d8b49a 1337 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1338 /*
a1d8b49a 1339 * Copy the original CDB into cmd->
c66ac9db 1340 */
a1d8b49a 1341 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1342
e5c0d6ad
RD		 1343 trace_target_sequencer_start(cmd);
1344
0fd97ccf 1345 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1346 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1347 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1348 cmd->se_tfo->get_fabric_name(),
1349 cmd->se_sess->se_node_acl->initiatorname,
1350 cmd->t_task_cdb[0]);
de103c93
CH		 1351 if (ret)
1352 return ret;
1353
1354 ret = transport_check_alloc_task_attr(cmd);
1355 if (ret)
c66ac9db 1356 return ret;
cb4f4d3c 1357
cb4f4d3c 1358 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1359 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1360 return 0;
1361}
a12f41f8 1362EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1363
695434e1
NB		 1364/*
1365 * Used by fabric module frontends to queue tasks directly.
ac75d8be 1366 * May only be used from process context.
695434e1
NB		 1367 */
1368int transport_handle_cdb_direct(
1369 struct se_cmd *cmd)
1370{
de103c93 1371 sense_reason_t ret;
dd8ae59d 1372
695434e1
NB		 1373 if (!cmd->se_lun) {
1374 dump_stack();
6708bb27 1375 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1376 return -EINVAL;
1377 }
1378 if (in_interrupt()) {
1379 dump_stack();
6708bb27 1380 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1381 " from interrupt context\n");
1382 return -EINVAL;
1383 }
dd8ae59d 1384 /*
af877292
CH		 1385 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1386 * outstanding descriptors are handled correctly during shutdown via
1387 * transport_wait_for_tasks()
dd8ae59d
NB		 1388 *
1389 * Also, we don't take cmd->t_state_lock here as we only expect
1390 * this to be called for initial descriptor submission.
1391 */
1392 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1393 cmd->transport_state |= CMD_T_ACTIVE;
1394
dd8ae59d
NB		 1395 /*
1396 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1397 * so follow TRANSPORT_NEW_CMD processing thread context usage
1398 * and call transport_generic_request_failure() if necessary..
1399 */
1400 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1401 if (ret)
1402 transport_generic_request_failure(cmd, ret);
dd8ae59d 1403 return 0;
695434e1
NB		 1404}
1405EXPORT_SYMBOL(transport_handle_cdb_direct);
1406
c5ff8d6b 1407sense_reason_t
de103c93
CH		 1408transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1409 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1410{
1411 if (!sgl || !sgl_count)
1412 return 0;
1413
1414 /*
1415 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1416 * scatterlists already have been set to follow what the fabric
1417 * passes for the original expected data transfer length.
1418 */
1419 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1420 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1421 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1422 return TCM_INVALID_CDB_FIELD;
1423 }
1424
1425 cmd->t_data_sg = sgl;
1426 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1427 cmd->t_bidi_data_sg = sgl_bidi;
1428 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1429
de103c93
CH		 1430 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1431 return 0;
1432}
1433
a026757f
NB		 1434/*
1435 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1436 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1437 *
1438 * @se_cmd: command descriptor to submit
1439 * @se_sess: associated se_sess for endpoint
1440 * @cdb: pointer to SCSI CDB
1441 * @sense: pointer to SCSI sense buffer
1442 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1443 * @data_length: fabric expected data transfer length
1444 * @task_addr: SAM task attribute
1445 * @data_dir: DMA data direction
1446 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1447 * @sgl: struct scatterlist memory for unidirectional mapping
1448 * @sgl_count: scatterlist count for unidirectional mapping
1449 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1450 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1451 * @sgl_prot: struct scatterlist memory protection information
1452 * @sgl_prot_count: scatterlist count for protection information
a6360785 1453 *
649ee054
BVA		 1454 * Task tags are supported if the caller has set @se_cmd->tag.
1455 *
d6dfc868
RD		 1456 * Returns non zero to signal active I/O shutdown failure. All other
1457 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1458 * but still return zero here.
1459 *
a6360785
NB		 1460 * This may only be called from process context, and also currently
1461 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1462 */
1463int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1464 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1465 u32 data_length, int task_attr, int data_dir, int flags,
1466 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1467 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1468 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1469{
1470 struct se_portal_group *se_tpg;
de103c93
CH		 1471 sense_reason_t rc;
1472 int ret;
a6360785
NB		 1473
1474 se_tpg = se_sess->se_tpg;
1475 BUG_ON(!se_tpg);
1476 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1477 BUG_ON(in_interrupt());
1478 /*
1479 * Initialize se_cmd for target operation. From this point
1480 * exceptions are handled by sending exception status via
1481 * target_core_fabric_ops->queue_status() callback
1482 */
1483 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1484 data_length, data_dir, task_attr, sense);
9095adaa
QT		 1485
1486 if (flags & TARGET_SCF_USE_CPUID)
1487 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1488 else
1489 se_cmd->cpuid = WORK_CPU_UNBOUND;
1490
b0d79946
SAS		 1491 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1492 se_cmd->unknown_data_length = 1;
a6360785
NB		 1493 /*
1494 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1495 * se_sess->sess_cmd_list. A second kref_get here is necessary
1496 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1497 * kref_put() to happen during fabric packet acknowledgement.
1498 */
afc16604 1499 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1500 if (ret)
1501 return ret;
a6360785
NB		 1502 /*
1503 * Signal bidirectional data payloads to target-core
1504 */
1505 if (flags & TARGET_SCF_BIDI_OP)
1506 se_cmd->se_cmd_flags |= SCF_BIDI;
1507 /*
1508 * Locate se_lun pointer and attach it to struct se_cmd
1509 */
de103c93
CH		 1510 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1511 if (rc) {
1512 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1513 target_put_sess_cmd(se_cmd);
d6dfc868 1514 return 0;
735703ca 1515 }
b5b8e298
SG		 1516
1517 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1518 if (rc != 0) {
1519 transport_generic_request_failure(se_cmd, rc);
1520 return 0;
1521 }
1522
def2b339
NB		 1523 /*
1524 * Save pointers for SGLs containing protection information,
1525 * if present.
1526 */
1527 if (sgl_prot_count) {
1528 se_cmd->t_prot_sg = sgl_prot;
1529 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1530 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1531 }
d6e0175c 1532
a026757f
NB		 1533 /*
1534 * When a non zero sgl_count has been passed perform SGL passthrough
1535 * mapping for pre-allocated fabric memory instead of having target
1536 * core perform an internal SGL allocation..
1537 */
1538 if (sgl_count != 0) {
1539 BUG_ON(!sgl);
1540
944981c7
NB		 1541 /*
1542 * A work-around for tcm_loop as some userspace code via
1543 * scsi-generic do not memset their associated read buffers,
1544 * so go ahead and do that here for type non-data CDBs. Also
1545 * note that this is currently guaranteed to be a single SGL
1546 * for this case by target core in target_setup_cmd_from_cdb()
1547 * -> transport_generic_cmd_sequencer().
1548 */
1549 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1550 se_cmd->data_direction == DMA_FROM_DEVICE) {
1551 unsigned char *buf = NULL;
1552
1553 if (sgl)
1554 buf = kmap(sg_page(sgl)) + sgl->offset;
1555
1556 if (buf) {
1557 memset(buf, 0, sgl->length);
1558 kunmap(sg_page(sgl));
1559 }
1560 }
1561
a026757f
NB		 1562 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1563 sgl_bidi, sgl_bidi_count);
1564 if (rc != 0) {
de103c93 1565 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1566 return 0;
1567 }
1568 }
def2b339 1569
11e319ed
AG		 1570 /*
1571 * Check if we need to delay processing because of ALUA
1572 * Active/NonOptimized primary access state..
1573 */
1574 core_alua_check_nonop_delay(se_cmd);
1575
a6360785 1576 transport_handle_cdb_direct(se_cmd);
d6dfc868 1577 return 0;
a6360785 1578}
a026757f
NB		 1579EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1580
1581/*
1582 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1583 *
1584 * @se_cmd: command descriptor to submit
1585 * @se_sess: associated se_sess for endpoint
1586 * @cdb: pointer to SCSI CDB
1587 * @sense: pointer to SCSI sense buffer
1588 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1589 * @data_length: fabric expected data transfer length
1590 * @task_addr: SAM task attribute
1591 * @data_dir: DMA data direction
1592 * @flags: flags for command submission from target_sc_flags_tables
1593 *
649ee054
BVA		 1594 * Task tags are supported if the caller has set @se_cmd->tag.
1595 *
a026757f
NB		 1596 * Returns non zero to signal active I/O shutdown failure. All other
1597 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1598 * but still return zero here.
1599 *
1600 * This may only be called from process context, and also currently
1601 * assumes internal allocation of fabric payload buffer by target-core.
1602 *
1603 * It also assumes interal target core SGL memory allocation.
1604 */
1605int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1606 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1607 u32 data_length, int task_attr, int data_dir, int flags)
1608{
1609 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1610 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1611 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1612}
a6360785
NB		 1613EXPORT_SYMBOL(target_submit_cmd);
1614
9f0d05c2
NB		 1615static void target_complete_tmr_failure(struct work_struct *work)
1616{
1617 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1618
1619 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1620 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0 1621
eeb64d23 1622 transport_lun_remove_cmd(se_cmd);
5a3b6fc0 1623 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1624}
1625
5465e7d3
NB		 1626static bool target_lookup_lun_from_tag(struct se_session *se_sess, u64 tag,
1627 u64 *unpacked_lun)
1628{
1629 struct se_cmd *se_cmd;
1630 unsigned long flags;
1631 bool ret = false;
1632
1633 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
1634 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) {
1635 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
1636 continue;
1637
1638 if (se_cmd->tag == tag) {
1639 *unpacked_lun = se_cmd->orig_fe_lun;
1640 ret = true;
1641 break;
1642 }
1643 }
1644 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
1645
1646 return ret;
1647}
1648
ea98d7f9
AG		 1649/**
1650 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1651 * for TMR CDBs
1652 *
1653 * @se_cmd: command descriptor to submit
1654 * @se_sess: associated se_sess for endpoint
1655 * @sense: pointer to SCSI sense buffer
1656 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1657 * @fabric_context: fabric context for TMR req
1658 * @tm_type: Type of TM request
c0974f89
NB		 1659 * @gfp: gfp type for caller
1660 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1661 * @flags: submit cmd flags
ea98d7f9
AG		 1662 *
1663 * Callable from all contexts.
1664 **/
1665
c7042cae 1666int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1667 unsigned char *sense, u64 unpacked_lun,
c0974f89 1668 void *fabric_tmr_ptr, unsigned char tm_type,
5261d86c 1669 gfp_t gfp, u64 tag, int flags)
ea98d7f9
AG		 1670{
1671 struct se_portal_group *se_tpg;
1672 int ret;
1673
1674 se_tpg = se_sess->se_tpg;
1675 BUG_ON(!se_tpg);
1676
1677 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1678 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1679 /*
1680 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1681 * allocation failure.
1682 */
c0974f89 1683 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1684 if (ret < 0)
1685 return -ENOMEM;
ea98d7f9 1686
c0974f89
NB		 1687 if (tm_type == TMR_ABORT_TASK)
1688 se_cmd->se_tmr_req->ref_task_tag = tag;
1689
ea98d7f9 1690 /* See target_submit_cmd for commentary */
afc16604 1691 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1692 if (ret) {
1693 core_tmr_release_req(se_cmd->se_tmr_req);
1694 return ret;
1695 }
5465e7d3
NB		 1696 /*
1697 * If this is ABORT_TASK with no explicit fabric provided LUN,
1698 * go ahead and search active session tags for a match to figure
1699 * out unpacked_lun for the original se_cmd.
1700 */
1701 if (tm_type == TMR_ABORT_TASK && (flags & TARGET_SCF_LOOKUP_LUN_FROM_TAG)) {
1702 if (!target_lookup_lun_from_tag(se_sess, tag, &unpacked_lun))
1703 goto failure;
1704 }
ea98d7f9 1705
ea98d7f9 1706 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
5465e7d3
NB		 1707 if (ret)
1708 goto failure;
1709
ea98d7f9 1710 transport_generic_handle_tmr(se_cmd);
c7042cae 1711 return 0;
5465e7d3
NB		 1712
1713 /*
1714 * For callback during failure handling, push this work off
1715 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1716 */
1717failure:
1718 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1719 schedule_work(&se_cmd->work);
1720 return 0;
ea98d7f9
AG		 1721}
1722EXPORT_SYMBOL(target_submit_tmr);
1723
c66ac9db
NB		 1724/*
1725 * Handle SAM-esque emulation for generic transport request failures.
1726 */
de103c93
CH		 1727void transport_generic_request_failure(struct se_cmd *cmd,
1728 sense_reason_t sense_reason)
c66ac9db 1729{
057085e5 1730 int ret = 0, post_ret = 0;
07bde79a 1731
c00e6220
BVA		 1732 pr_debug("-----[ Storage Engine Exception; sense_reason %d\n",
1733 sense_reason);
1734 target_show_cmd("-----[ ", cmd);
c66ac9db 1735
c66ac9db
NB		 1736 /*
1737 * For SAM Task Attribute emulation for failed struct se_cmd
1738 */
019c4ca6 1739 transport_complete_task_attr(cmd);
fd2f928b 1740
cf6d1f09
NB		 1741 /*
1742 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1743 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1744 */
1745 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1746 cmd->transport_complete_callback)
057085e5 1747 cmd->transport_complete_callback(cmd, false, &post_ret);
c66ac9db 1748
fd2f928b
NB		 1749 if (transport_check_aborted_status(cmd, 1))
1750 return;
1751
de103c93 1752 switch (sense_reason) {
03e98c9e
NB		 1753 case TCM_NON_EXISTENT_LUN:
1754 case TCM_UNSUPPORTED_SCSI_OPCODE:
1755 case TCM_INVALID_CDB_FIELD:
1756 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1757 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1758 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1759 case TCM_UNKNOWN_MODE_PAGE:
1760 case TCM_WRITE_PROTECTED:
e2397c70 1761 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1762 case TCM_CHECK_CONDITION_ABORT_CMD:
1763 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1764 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1765 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1766 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1767 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
449a1378 1768 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE:
e8642120
DD		 1769 case TCM_TOO_MANY_TARGET_DESCS:
1770 case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE:
1771 case TCM_TOO_MANY_SEGMENT_DESCS:
1772 case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE:
c66ac9db 1773 break;
de103c93 1774 case TCM_OUT_OF_RESOURCES:
a271eac4
MC		 1775 cmd->scsi_status = SAM_STAT_TASK_SET_FULL;
1776 goto queue_status;
03e98c9e 1777 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1778 /*
1779 * No SENSE Data payload for this case, set SCSI Status
1780 * and queue the response to $FABRIC_MOD.
1781 *
1782 * Uses linux/include/scsi/scsi.h SAM status codes defs
1783 */
1784 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1785 /*
1786 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1787 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1788 * CONFLICT STATUS.
1789 *
1790 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1791 */
e3d6f909 1792 if (cmd->se_sess &&
c51c8e7b
HR		 1793 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1794 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1795 cmd->orig_fe_lun, 0x2C,
1796 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1797 }
a271eac4
MC		 1798
1799 goto queue_status;
c66ac9db 1800 default:
6708bb27 1801 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1802 cmd->t_task_cdb[0], sense_reason);
1803 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1804 break;
1805 }
f3146437 1806
de103c93 1807 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
fa7e25cf 1808 if (ret)
03e98c9e 1809 goto queue_full;
07bde79a 1810
c66ac9db
NB		 1811check_stop:
1812 transport_lun_remove_cmd(cmd);
06b967e4 1813 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1814 return;
1815
a271eac4
MC		 1816queue_status:
1817 trace_target_cmd_complete(cmd);
1818 ret = cmd->se_tfo->queue_status(cmd);
1819 if (!ret)
1820 goto check_stop;
07bde79a 1821queue_full:
fa7e25cf 1822 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db 1823}
2fbff127 1824EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1825
dff0ca9e 1826void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
c66ac9db 1827{
de103c93 1828 sense_reason_t ret;
5f41a31d 1829
dff0ca9e
NB		 1830 if (!cmd->execute_cmd) {
1831 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1832 goto err;
1833 }
1834 if (do_checks) {
1835 /*
1836 * Check for an existing UNIT ATTENTION condition after
1837 * target_handle_task_attr() has done SAM task attr
1838 * checking, and possibly have already defered execution
1839 * out to target_restart_delayed_cmds() context.
1840 */
1841 ret = target_scsi3_ua_check(cmd);
1842 if (ret)
1843 goto err;
1844
1845 ret = target_alua_state_check(cmd);
1846 if (ret)
1847 goto err;
5f41a31d 1848
dff0ca9e
NB		 1849 ret = target_check_reservation(cmd);
1850 if (ret) {
1851 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1852 goto err;
de103c93 1853 }
5f41a31d 1854 }
dff0ca9e
NB		 1855
1856 ret = cmd->execute_cmd(cmd);
1857 if (!ret)
1858 return;
1859err:
1860 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1861 cmd->transport_state &= ~CMD_T_SENT;
dff0ca9e
NB		 1862 spin_unlock_irq(&cmd->t_state_lock);
1863
1864 transport_generic_request_failure(cmd, ret);
5f41a31d
CH		 1865}
1866
aa58b531
NB		 1867static int target_write_prot_action(struct se_cmd *cmd)
1868{
5132d1e6 1869 u32 sectors;
aa58b531
NB		 1870 /*
1871 * Perform WRITE_INSERT of PI using software emulation when backend
1872 * device has PI enabled, if the transport has not already generated
1873 * PI using hardware WRITE_INSERT offload.
1874 */
1875 switch (cmd->prot_op) {
1876 case TARGET_PROT_DOUT_INSERT:
1877 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1878 sbc_dif_generate(cmd);
1879 break;
5132d1e6
NB		 1880 case TARGET_PROT_DOUT_STRIP:
1881 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1882 break;
1883
1884 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1885 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1886 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1887 if (unlikely(cmd->pi_err)) {
1888 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1889 cmd->transport_state &= ~CMD_T_SENT;
5132d1e6
NB		 1890 spin_unlock_irq(&cmd->t_state_lock);
1891 transport_generic_request_failure(cmd, cmd->pi_err);
1892 return -1;
1893 }
1894 break;
aa58b531
NB		 1895 default:
1896 break;
1897 }
1898
1899 return 0;
1900}
1901
019c4ca6 1902static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1903{
1904 struct se_device *dev = cmd->se_dev;
1905
a3541703 1906 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1907 return false;
5f41a31d 1908
410c29df
NB		 1909 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1910
c66ac9db 1911 /*
25985edc 1912 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1913 * to allow the passed struct se_cmd list of tasks to the front of the list.
1914 */
5f41a31d 1915 switch (cmd->sam_task_attr) {
68d81f40 1916 case TCM_HEAD_TAG:
9c31820b
RD		 1917 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1918 cmd->t_task_cdb[0]);
019c4ca6 1919 return false;
68d81f40 1920 case TCM_ORDERED_TAG:
33940d09 1921 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1922
9c31820b
RD		 1923 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1924 cmd->t_task_cdb[0]);
5f41a31d 1925
c66ac9db 1926 /*
5f41a31d
CH		 1927 * Execute an ORDERED command if no other older commands
1928 * exist that need to be completed first.
c66ac9db 1929 */
5f41a31d 1930 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1931 return false;
5f41a31d
CH		 1932 break;
1933 default:
c66ac9db
NB		 1934 /*
1935 * For SIMPLE and UNTAGGED Task Attribute commands
1936 */
33940d09 1937 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1938 break;
c66ac9db 1939 }
5f41a31d 1940
019c4ca6
CH		 1941 if (atomic_read(&dev->dev_ordered_sync) == 0)
1942 return false;
c66ac9db 1943
019c4ca6
CH		 1944 spin_lock(&dev->delayed_cmd_lock);
1945 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1946 spin_unlock(&dev->delayed_cmd_lock);
1947
9c31820b
RD		 1948 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1949 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1950 return true;
1951}
1952
310d3d31
NB		 1953static int __transport_check_aborted_status(struct se_cmd *, int);
1954
019c4ca6
CH		 1955void target_execute_cmd(struct se_cmd *cmd)
1956{
019c4ca6
CH		 1957 /*
1958 * Determine if frontend context caller is requesting the stopping of
1959 * this command for frontend exceptions.
310d3d31
NB		 1960 *
1961 * If the received CDB has aleady been aborted stop processing it here.
019c4ca6 1962 */
4a9a6c8d 1963 spin_lock_irq(&cmd->t_state_lock);
310d3d31
NB		 1964 if (__transport_check_aborted_status(cmd, 1)) {
1965 spin_unlock_irq(&cmd->t_state_lock);
1966 return;
1967 }
019c4ca6 1968 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1969 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1970 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1971
1972 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1973 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1974 return;
1975 }
1976
1977 cmd->t_state = TRANSPORT_PROCESSING;
1c21a480 1978 cmd->transport_state &= ~CMD_T_PRE_EXECUTE;
fd5e64de 1979 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT;
019c4ca6 1980 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1981
1982 if (target_write_prot_action(cmd))
1983 return;
019c4ca6 1984
1a398b97
NB		 1985 if (target_handle_task_attr(cmd)) {
1986 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1987 cmd->transport_state &= ~CMD_T_SENT;
1a398b97
NB		 1988 spin_unlock_irq(&cmd->t_state_lock);
1989 return;
1990 }
1991
dff0ca9e 1992 __target_execute_cmd(cmd, true);
c66ac9db 1993}
70baf0ab 1994EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1995
5f41a31d
CH		 1996/*
1997 * Process all commands up to the last received ORDERED task attribute which
1998 * requires another blocking boundary
1999 */
2000static void target_restart_delayed_cmds(struct se_device *dev)
2001{
2002 for (;;) {
2003 struct se_cmd *cmd;
2004
2005 spin_lock(&dev->delayed_cmd_lock);
2006 if (list_empty(&dev->delayed_cmd_list)) {
2007 spin_unlock(&dev->delayed_cmd_lock);
2008 break;
2009 }
2010
2011 cmd = list_entry(dev->delayed_cmd_list.next,
2012 struct se_cmd, se_delayed_node);
2013 list_del(&cmd->se_delayed_node);
2014 spin_unlock(&dev->delayed_cmd_lock);
2015
1c79df1f
NB		 2016 cmd->transport_state |= CMD_T_SENT;
2017
dff0ca9e 2018 __target_execute_cmd(cmd, true);
5f41a31d 2019
68d81f40 2020 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 2021 break;
2022 }
2023}
2024
c66ac9db 2025/*
35e0e757 2026 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 2027 * and ordered cmds need to have their tasks added to the execution queue.
2028 */
2029static void transport_complete_task_attr(struct se_cmd *cmd)
2030{
5951146d 2031 struct se_device *dev = cmd->se_dev;
c66ac9db 2032
a3541703 2033 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 2034 return;
2035
410c29df
NB		 2036 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
2037 goto restart;
2038
68d81f40 2039 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 2040 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 2041 dev->dev_cur_ordered_id++;
68d81f40 2042 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 2043 dev->dev_cur_ordered_id++;
9c31820b
RD		 2044 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
2045 dev->dev_cur_ordered_id);
68d81f40 2046 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 2047 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 2048
2049 dev->dev_cur_ordered_id++;
9c31820b
RD		 2050 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
2051 dev->dev_cur_ordered_id);
c66ac9db 2052 }
1c79df1f
NB		 2053 cmd->se_cmd_flags &= ~SCF_TASK_ATTR_SET;
2054
410c29df 2055restart:
5f41a31d 2056 target_restart_delayed_cmds(dev);
c66ac9db
NB		 2057}
2058
e057f533 2059static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 2060{
2061 int ret = 0;
2062
019c4ca6 2063 transport_complete_task_attr(cmd);
fa7e25cf
NB		 2064 /*
2065 * If a fabric driver ->write_pending() or ->queue_data_in() callback
2066 * has returned neither -ENOMEM or -EAGAIN, assume it's fatal and
2067 * the same callbacks should not be retried. Return CHECK_CONDITION
2068 * if a scsi_status is not already set.
2069 *
2070 * If a fabric driver ->queue_status() has returned non zero, always
2071 * keep retrying no matter what..
2072 */
2073 if (cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) {
2074 if (cmd->scsi_status)
2075 goto queue_status;
e057f533 2076
fa7e25cf
NB		 2077 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2078 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2079 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2080 translate_sense_reason(cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
2081 goto queue_status;
e057f533 2082 }
07bde79a 2083
fa7e25cf
NB		 2084 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
2085 goto queue_status;
2086
07bde79a
NB		 2087 switch (cmd->data_direction) {
2088 case DMA_FROM_DEVICE:
4347ab5a
NB		 2089 if (cmd->scsi_status)
2090 goto queue_status;
2091
e5c0d6ad 2092 trace_target_cmd_complete(cmd);
07bde79a
NB		 2093 ret = cmd->se_tfo->queue_data_in(cmd);
2094 break;
2095 case DMA_TO_DEVICE:
64577407 2096 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 2097 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 2098 break;
07bde79a 2099 }
d7e595dd 2100 /* fall through */
07bde79a 2101 case DMA_NONE:
4347ab5a 2102queue_status:
e5c0d6ad 2103 trace_target_cmd_complete(cmd);
07bde79a
NB		 2104 ret = cmd->se_tfo->queue_status(cmd);
2105 break;
2106 default:
2107 break;
2108 }
2109
e057f533 2110 if (ret < 0) {
fa7e25cf 2111 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
e057f533
CH		 2112 return;
2113 }
2114 transport_lun_remove_cmd(cmd);
2115 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2116}
2117
fa7e25cf
NB		 2118static void transport_handle_queue_full(struct se_cmd *cmd, struct se_device *dev,
2119 int err, bool write_pending)
07bde79a 2120{
fa7e25cf
NB		 2121 /*
2122 * -EAGAIN or -ENOMEM signals retry of ->write_pending() and/or
2123 * ->queue_data_in() callbacks from new process context.
2124 *
2125 * Otherwise for other errors, transport_complete_qf() will send
2126 * CHECK_CONDITION via ->queue_status() instead of attempting to
2127 * retry associated fabric driver data-transfer callbacks.
2128 */
2129 if (err == -EAGAIN || err == -ENOMEM) {
2130 cmd->t_state = (write_pending) ? TRANSPORT_COMPLETE_QF_WP :
2131 TRANSPORT_COMPLETE_QF_OK;
2132 } else {
2133 pr_warn_ratelimited("Got unknown fabric queue status: %d\n", err);
2134 cmd->t_state = TRANSPORT_COMPLETE_QF_ERR;
2135 }
2136
07bde79a 2137 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 2138 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 2139 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 2140 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2141
2142 schedule_work(&cmd->se_dev->qf_work_queue);
2143}
2144
fdeab852 2145static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2146{
fdeab852
NB		 2147 switch (cmd->prot_op) {
2148 case TARGET_PROT_DIN_STRIP:
2149 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2150 u32 sectors = cmd->data_length >>
2151 ilog2(cmd->se_dev->dev_attrib.block_size);
2152
2153 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2154 sectors, 0, cmd->t_prot_sg,
2155 0);
2156 if (cmd->pi_err)
fdeab852 2157 return true;
bc005869 2158 }
fdeab852 2159 break;
72c03850
NB		 2160 case TARGET_PROT_DIN_INSERT:
2161 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2162 break;
2163
2164 sbc_dif_generate(cmd);
2165 break;
fdeab852
NB		 2166 default:
2167 break;
bc005869
NB		 2168 }
2169
2170 return false;
2171}
2172
35e0e757 2173static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2174{
35e0e757 2175 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2176 int ret;
35e0e757 2177
c66ac9db
NB		 2178 /*
2179 * Check if we need to move delayed/dormant tasks from cmds on the
2180 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2181 * Attribute.
2182 */
019c4ca6
CH		 2183 transport_complete_task_attr(cmd);
2184
07bde79a
NB		 2185 /*
2186 * Check to schedule QUEUE_FULL work, or execute an existing
2187 * cmd->transport_qf_callback()
2188 */
2189 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2190 schedule_work(&cmd->se_dev->qf_work_queue);
2191
c66ac9db 2192 /*
d5829eac 2193 * Check if we need to send a sense buffer from
c66ac9db
NB		 2194 * the struct se_cmd in question.
2195 */
2196 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2197 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2198 ret = transport_send_check_condition_and_sense(
2199 cmd, 0, 1);
fa7e25cf 2200 if (ret)
27a27099
PB		 2201 goto queue_full;
2202
2203 transport_lun_remove_cmd(cmd);
2204 transport_cmd_check_stop_to_fabric(cmd);
2205 return;
c66ac9db
NB		 2206 }
2207 /*
25985edc 2208 * Check for a callback, used by amongst other things
a6b0133c 2209 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2210 */
a6b0133c
NB		 2211 if (cmd->transport_complete_callback) {
2212 sense_reason_t rc;
057085e5
NB		 2213 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2214 bool zero_dl = !(cmd->data_length);
2215 int post_ret = 0;
a6b0133c 2216
057085e5
NB		 2217 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2218 if (!rc && !post_ret) {
2219 if (caw && zero_dl)
c8e63985
NB		 2220 goto queue_rsp;
2221
a6b0133c 2222 return;
a2890087
NB		 2223 } else if (rc) {
2224 ret = transport_send_check_condition_and_sense(cmd,
2225 rc, 0);
fa7e25cf 2226 if (ret)
a2890087 2227 goto queue_full;
a6b0133c 2228
a2890087
NB		 2229 transport_lun_remove_cmd(cmd);
2230 transport_cmd_check_stop_to_fabric(cmd);
2231 return;
2232 }
a6b0133c 2233 }
c66ac9db 2234
c8e63985 2235queue_rsp:
c66ac9db
NB		 2236 switch (cmd->data_direction) {
2237 case DMA_FROM_DEVICE:
4347ab5a
NB		 2238 if (cmd->scsi_status)
2239 goto queue_status;
2240
4cc987ea
NB		 2241 atomic_long_add(cmd->data_length,
2242 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2243 /*
2244 * Perform READ_STRIP of PI using software emulation when
2245 * backend had PI enabled, if the transport will not be
2246 * performing hardware READ_STRIP offload.
2247 */
fdeab852 2248 if (target_read_prot_action(cmd)) {
bc005869
NB		 2249 ret = transport_send_check_condition_and_sense(cmd,
2250 cmd->pi_err, 0);
fa7e25cf 2251 if (ret)
bc005869
NB		 2252 goto queue_full;
2253
2254 transport_lun_remove_cmd(cmd);
2255 transport_cmd_check_stop_to_fabric(cmd);
2256 return;
2257 }
c66ac9db 2258
e5c0d6ad 2259 trace_target_cmd_complete(cmd);
07bde79a 2260 ret = cmd->se_tfo->queue_data_in(cmd);
fa7e25cf 2261 if (ret)
07bde79a 2262 goto queue_full;
c66ac9db
NB		 2263 break;
2264 case DMA_TO_DEVICE:
4cc987ea
NB		 2265 atomic_long_add(cmd->data_length,
2266 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2267 /*
2268 * Check if we need to send READ payload for BIDI-COMMAND
2269 */
64577407 2270 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2271 atomic_long_add(cmd->data_length,
2272 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2273 ret = cmd->se_tfo->queue_data_in(cmd);
fa7e25cf 2274 if (ret)
07bde79a 2275 goto queue_full;
c66ac9db
NB		 2276 break;
2277 }
d7e595dd 2278 /* fall through */
c66ac9db 2279 case DMA_NONE:
4347ab5a 2280queue_status:
e5c0d6ad 2281 trace_target_cmd_complete(cmd);
07bde79a 2282 ret = cmd->se_tfo->queue_status(cmd);
fa7e25cf 2283 if (ret)
07bde79a 2284 goto queue_full;
c66ac9db
NB		 2285 break;
2286 default:
2287 break;
2288 }
2289
2290 transport_lun_remove_cmd(cmd);
2291 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2292 return;
2293
2294queue_full:
6708bb27 2295 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2296 " data_direction: %d\n", cmd, cmd->data_direction);
fa7e25cf
NB		 2297
2298 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db
NB		 2299}
2300
e64aa657 2301void target_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2302{
ec98f782 2303 struct scatterlist *sg;
ec98f782 2304 int count;
c66ac9db 2305
6708bb27
AG		 2306 for_each_sg(sgl, sg, nents, count)
2307 __free_page(sg_page(sg));
c66ac9db 2308
6708bb27
AG		 2309 kfree(sgl);
2310}
e64aa657 2311EXPORT_SYMBOL(target_free_sgl);
c66ac9db 2312
47e459e6
NB		 2313static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2314{
2315 /*
2316 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2317 * emulation, and free + reset pointers if necessary..
2318 */
2319 if (!cmd->t_data_sg_orig)
2320 return;
2321
2322 kfree(cmd->t_data_sg);
2323 cmd->t_data_sg = cmd->t_data_sg_orig;
2324 cmd->t_data_sg_orig = NULL;
2325 cmd->t_data_nents = cmd->t_data_nents_orig;
2326 cmd->t_data_nents_orig = 0;
2327}
2328
6708bb27
AG		 2329static inline void transport_free_pages(struct se_cmd *cmd)
2330{
5835812f 2331 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
e64aa657 2332 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
5835812f
AM		 2333 cmd->t_prot_sg = NULL;
2334 cmd->t_prot_nents = 0;
2335 }
2336
47e459e6 2337 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2338 /*
2339 * Release special case READ buffer payload required for
2340 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2341 */
2342 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
e64aa657 2343 target_free_sgl(cmd->t_bidi_data_sg,
c8e63985
NB		 2344 cmd->t_bidi_data_nents);
2345 cmd->t_bidi_data_sg = NULL;
2346 cmd->t_bidi_data_nents = 0;
2347 }
47e459e6 2348 transport_reset_sgl_orig(cmd);
6708bb27 2349 return;
47e459e6
NB		 2350 }
2351 transport_reset_sgl_orig(cmd);
6708bb27 2352
e64aa657 2353 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2354 cmd->t_data_sg = NULL;
2355 cmd->t_data_nents = 0;
c66ac9db 2356
e64aa657 2357 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2358 cmd->t_bidi_data_sg = NULL;
2359 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2360}
2361
4949314c 2362void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2363{
ec98f782 2364 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2365 struct page **pages;
2366 int i;
05d1c7c0
AG		 2367
2368 /*
ec98f782
AG		 2369 * We need to take into account a possible offset here for fabrics like
2370 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2371 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2372 */
4949314c
AG		 2373 if (!cmd->t_data_nents)
2374 return NULL;
3717ef0c
PB		 2375
2376 BUG_ON(!sg);
2377 if (cmd->t_data_nents == 1)
4949314c
AG		 2378 return kmap(sg_page(sg)) + sg->offset;
2379
2380 /* >1 page. use vmap */
df6751f3 2381 pages = kmalloc_array(cmd->t_data_nents, sizeof(*pages), GFP_KERNEL);
de103c93 2382 if (!pages)
4949314c
AG		 2383 return NULL;
2384
2385 /* convert sg[] to pages[] */
2386 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2387 pages[i] = sg_page(sg);
2388 }
2389
2390 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2391 kfree(pages);
de103c93 2392 if (!cmd->t_data_vmap)
4949314c
AG		 2393 return NULL;
2394
2395 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2396}
4949314c 2397EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2398
4949314c 2399void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2400{
a1edf9cf 2401 if (!cmd->t_data_nents) {
4949314c 2402 return;
a1edf9cf 2403 } else if (cmd->t_data_nents == 1) {
4949314c 2404 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2405 return;
2406 }
4949314c
AG		 2407
2408 vunmap(cmd->t_data_vmap);
2409 cmd->t_data_vmap = NULL;
05d1c7c0 2410}
4949314c 2411EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2412
c5ff8d6b 2413int
20093994 2414target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
e64aa657 2415 bool zero_page, bool chainable)
c66ac9db 2416{
20093994 2417 struct scatterlist *sg;
ec98f782 2418 struct page *page;
20093994 2419 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
e64aa657 2420 unsigned int nalloc, nent;
ec98f782 2421 int i = 0;
c66ac9db 2422
e64aa657
CH		 2423 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2424 if (chainable)
2425 nalloc++;
2426 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
20093994 2427 if (!sg)
ec98f782 2428 return -ENOMEM;
c66ac9db 2429
e64aa657 2430 sg_init_table(sg, nalloc);
9db9da33 2431
ec98f782
AG		 2432 while (length) {
2433 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2434 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2435 if (!page)
2436 goto out;
c66ac9db 2437
20093994 2438 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2439 length -= page_len;
2440 i++;
c66ac9db 2441 }
20093994
NB		 2442 *sgl = sg;
2443 *nents = nent;
c66ac9db 2444 return 0;
c66ac9db 2445
ec98f782 2446out:
d0e27c88 2447 while (i > 0) {
ec98f782 2448 i--;
20093994 2449 __free_page(sg_page(&sg[i]));
c66ac9db 2450 }
20093994 2451 kfree(sg);
ec98f782 2452 return -ENOMEM;
c66ac9db 2453}
e64aa657 2454EXPORT_SYMBOL(target_alloc_sgl);
c66ac9db 2455
da0f7619 2456/*
b16a35b0
AG		 2457 * Allocate any required resources to execute the command. For writes we
2458 * might not have the payload yet, so notify the fabric via a call to
2459 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2460 */
de103c93
CH		 2461sense_reason_t
2462transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2463{
b1a2ecda 2464 unsigned long flags;
c66ac9db 2465 int ret = 0;
c8e63985 2466 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2467
5835812f
AM		 2468 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2469 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2470 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
e64aa657 2471 cmd->prot_length, true, false);
5835812f
AM		 2472 if (ret < 0)
2473 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2474 }
2475
c66ac9db
NB		 2476 /*
2477 * Determine is the TCM fabric module has already allocated physical
2478 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2479 * beforehand.
c66ac9db 2480 */
ec98f782
AG		 2481 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2482 cmd->data_length) {
20093994 2483
8cefe07b
NB		 2484 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2485 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2486 u32 bidi_length;
2487
2488 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2489 bidi_length = cmd->t_task_nolb *
2490 cmd->se_dev->dev_attrib.block_size;
2491 else
2492 bidi_length = cmd->data_length;
2493
2494 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2495 &cmd->t_bidi_data_nents,
e64aa657 2496 bidi_length, zero_flag, false);
8cefe07b
NB		 2497 if (ret < 0)
2498 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2499 }
2500
20093994 2501 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
e64aa657 2502 cmd->data_length, zero_flag, false);
c66ac9db 2503 if (ret < 0)
de103c93 2504 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2505 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2506 cmd->data_length) {
2507 /*
2508 * Special case for COMPARE_AND_WRITE with fabrics
2509 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2510 */
2511 u32 caw_length = cmd->t_task_nolb *
2512 cmd->se_dev->dev_attrib.block_size;
2513
2514 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2515 &cmd->t_bidi_data_nents,
e64aa657 2516 caw_length, zero_flag, false);
c8e63985
NB		 2517 if (ret < 0)
2518 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2519 }
c66ac9db 2520 /*
c3196f0c
CH		 2521 * If this command is not a write we can execute it right here,
2522 * for write buffers we need to notify the fabric driver first
2523 * and let it call back once the write buffers are ready.
c66ac9db 2524 */
5f41a31d 2525 target_add_to_state_list(cmd);
885e7b0e 2526 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2527 target_execute_cmd(cmd);
2528 return 0;
2529 }
b1a2ecda
BVA		 2530
2531 spin_lock_irqsave(&cmd->t_state_lock, flags);
2532 cmd->t_state = TRANSPORT_WRITE_PENDING;
2533 /*
2534 * Determine if frontend context caller is requesting the stopping of
2535 * this command for frontend exceptions.
2536 */
2537 if (cmd->transport_state & CMD_T_STOP) {
2538 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
2539 __func__, __LINE__, cmd->tag);
2540
2541 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2542
2543 complete_all(&cmd->t_transport_stop_comp);
a5eb307f 2544 return 0;
b1a2ecda
BVA		 2545 }
2546 cmd->transport_state &= ~CMD_T_ACTIVE;
2547 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c3196f0c
CH		 2548
2549 ret = cmd->se_tfo->write_pending(cmd);
fa7e25cf 2550 if (ret)
c3196f0c
CH		 2551 goto queue_full;
2552
fa7e25cf 2553 return 0;
da0f7619 2554
c3196f0c
CH		 2555queue_full:
2556 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
fa7e25cf 2557 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
c3196f0c 2558 return 0;
c66ac9db 2559}
a1d8b49a 2560EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2561
e057f533 2562static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2563{
9574a497 2564 unsigned long flags;
f147abb4 2565 int ret;
9574a497
NB		 2566 bool stop;
2567
2568 spin_lock_irqsave(&cmd->t_state_lock, flags);
2569 stop = (cmd->transport_state & (CMD_T_STOP | CMD_T_ABORTED));
2570 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2571
2572 if (stop) {
2573 pr_debug("%s:%d CMD_T_STOP|CMD_T_ABORTED for ITT: 0x%08llx\n",
2574 __func__, __LINE__, cmd->tag);
2575 complete_all(&cmd->t_transport_stop_comp);
2576 return;
2577 }
f147abb4
NB		 2578
2579 ret = cmd->se_tfo->write_pending(cmd);
fa7e25cf 2580 if (ret) {
e057f533
CH		 2581 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2582 cmd);
fa7e25cf 2583 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
e057f533 2584 }
07bde79a
NB		 2585}
2586
0f4a9431
NB		 2587static bool
2588__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2589 unsigned long *flags);
2590
2591static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2592{
2593 unsigned long flags;
2594
2595 spin_lock_irqsave(&cmd->t_state_lock, flags);
2596 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2597 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2598}
2599
d5ddad41 2600int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2601{
d5ddad41 2602 int ret = 0;
0f4a9431 2603 bool aborted = false, tas = false;
d5ddad41 2604
d14921d6 2605 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2606 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
0f4a9431 2607 target_wait_free_cmd(cmd, &aborted, &tas);
d14921d6 2608
0f4a9431 2609 if (!aborted || tas)
c0170698 2610 ret = target_put_sess_cmd(cmd);
d14921d6
NB		 2611 } else {
2612 if (wait_for_tasks)
0f4a9431 2613 target_wait_free_cmd(cmd, &aborted, &tas);
c130480b
NB		 2614 /*
2615 * Handle WRITE failure case where transport_generic_new_cmd()
2616 * has already added se_cmd to state_list, but fabric has
2617 * failed command before I/O submission.
2618 */
febe562c 2619 if (cmd->state_active)
c130480b 2620 target_remove_from_state_list(cmd);
d14921d6 2621
82f1c8a4 2622 if (cmd->se_lun)
c66ac9db 2623 transport_lun_remove_cmd(cmd);
c66ac9db 2624
0f4a9431 2625 if (!aborted || tas)
c0170698 2626 ret = target_put_sess_cmd(cmd);
0f4a9431
NB		 2627 }
2628 /*
2629 * If the task has been internally aborted due to TMR ABORT_TASK
2630 * or LUN_RESET, target_core_tmr.c is responsible for performing
2631 * the remaining calls to target_put_sess_cmd(), and not the
2632 * callers of this function.
2633 */
2634 if (aborted) {
2635 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2636 wait_for_completion(&cmd->cmd_wait_comp);
2637 cmd->se_tfo->release_cmd(cmd);
2638 ret = 1;
c66ac9db 2639 }
d5ddad41 2640 return ret;
c66ac9db
NB		 2641}
2642EXPORT_SYMBOL(transport_generic_free_cmd);
2643
a17f091d 2644/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2645 * @se_cmd: command descriptor to add
a6360785 2646 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2647 */
afc16604 2648int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2649{
afc16604 2650 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2651 unsigned long flags;
bc187ea6 2652 int ret = 0;
a17f091d 2653
a6360785
NB		 2654 /*
2655 * Add a second kref if the fabric caller is expecting to handle
2656 * fabric acknowledgement that requires two target_put_sess_cmd()
2657 * invocations before se_cmd descriptor release.
2658 */
527268df 2659 if (ack_kref) {
1b4c59b7
HR		 2660 if (!kref_get_unless_zero(&se_cmd->cmd_kref))
2661 return -EINVAL;
2662
527268df
NB		 2663 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2664 }
7481deb4 2665
a17f091d 2666 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2667 if (se_sess->sess_tearing_down) {
2668 ret = -ESHUTDOWN;
2669 goto out;
2670 }
1c21a480 2671 se_cmd->transport_state |= CMD_T_PRE_EXECUTE;
a17f091d 2672 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2673out:
a17f091d 2674 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2675
2676 if (ret && ack_kref)
afc16604 2677 target_put_sess_cmd(se_cmd);
7544e597 2678
bc187ea6 2679 return ret;
a17f091d 2680}
20361e69 2681EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2682
febe562c
NB		 2683static void target_free_cmd_mem(struct se_cmd *cmd)
2684{
2685 transport_free_pages(cmd);
2686
2687 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2688 core_tmr_release_req(cmd->se_tmr_req);
2689 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2690 kfree(cmd->t_task_cdb);
2691}
2692
7481deb4 2693static void target_release_cmd_kref(struct kref *kref)
a17f091d 2694{
7481deb4
NB		 2695 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2696 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2697 unsigned long flags;
0f4a9431 2698 bool fabric_stop;
a17f091d 2699
6b6427b6
BVA		 2700 if (se_sess) {
2701 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2702
2703 spin_lock(&se_cmd->t_state_lock);
2704 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2705 (se_cmd->transport_state & CMD_T_ABORTED);
2706 spin_unlock(&se_cmd->t_state_lock);
2707
2708 if (se_cmd->cmd_wait_set || fabric_stop) {
2709 list_del_init(&se_cmd->se_cmd_list);
2710 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2711 target_free_cmd_mem(se_cmd);
2712 complete(&se_cmd->cmd_wait_comp);
2713 return;
2714 }
0f4a9431 2715 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2716 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2717 }
a17f091d 2718
febe562c 2719 target_free_cmd_mem(se_cmd);
7481deb4
NB		 2720 se_cmd->se_tfo->release_cmd(se_cmd);
2721}
2722
6b6427b6
BVA		 2723/**
2724 * target_put_sess_cmd - decrease the command reference count
2725 * @se_cmd: command to drop a reference from
2726 *
2727 * Returns 1 if and only if this target_put_sess_cmd() call caused the
2728 * refcount to drop to zero. Returns zero otherwise.
7481deb4 2729 */
afc16604 2730int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2731{
9ff9d15e 2732 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2733}
2734EXPORT_SYMBOL(target_put_sess_cmd);
2735
c00e6220
BVA		 2736static const char *data_dir_name(enum dma_data_direction d)
2737{
2738 switch (d) {
2739 case DMA_BIDIRECTIONAL: return "BIDI";
2740 case DMA_TO_DEVICE: return "WRITE";
2741 case DMA_FROM_DEVICE: return "READ";
2742 case DMA_NONE: return "NONE";
2743 }
2744
2745 return "(?)";
2746}
2747
2748static const char *cmd_state_name(enum transport_state_table t)
2749{
2750 switch (t) {
2751 case TRANSPORT_NO_STATE: return "NO_STATE";
2752 case TRANSPORT_NEW_CMD: return "NEW_CMD";
2753 case TRANSPORT_WRITE_PENDING: return "WRITE_PENDING";
2754 case TRANSPORT_PROCESSING: return "PROCESSING";
2755 case TRANSPORT_COMPLETE: return "COMPLETE";
2756 case TRANSPORT_ISTATE_PROCESSING:
2757 return "ISTATE_PROCESSING";
2758 case TRANSPORT_COMPLETE_QF_WP: return "COMPLETE_QF_WP";
2759 case TRANSPORT_COMPLETE_QF_OK: return "COMPLETE_QF_OK";
2760 case TRANSPORT_COMPLETE_QF_ERR: return "COMPLETE_QF_ERR";
2761 }
2762
2763 return "(?)";
2764}
2765
2766static void target_append_str(char **str, const char *txt)
2767{
2768 char *prev = *str;
2769
2770 *str = *str ? kasprintf(GFP_ATOMIC, "%s,%s", *str, txt) :
2771 kstrdup(txt, GFP_ATOMIC);
2772 kfree(prev);
2773}
2774
2775/*
2776 * Convert a transport state bitmask into a string. The caller is
2777 * responsible for freeing the returned pointer.
2778 */
2779static char *target_ts_to_str(u32 ts)
2780{
2781 char *str = NULL;
2782
2783 if (ts & CMD_T_ABORTED)
2784 target_append_str(&str, "aborted");
2785 if (ts & CMD_T_ACTIVE)
2786 target_append_str(&str, "active");
2787 if (ts & CMD_T_COMPLETE)
2788 target_append_str(&str, "complete");
2789 if (ts & CMD_T_SENT)
2790 target_append_str(&str, "sent");
2791 if (ts & CMD_T_STOP)
2792 target_append_str(&str, "stop");
2793 if (ts & CMD_T_FABRIC_STOP)
2794 target_append_str(&str, "fabric_stop");
2795
2796 return str;
2797}
2798
2799static const char *target_tmf_name(enum tcm_tmreq_table tmf)
2800{
2801 switch (tmf) {
2802 case TMR_ABORT_TASK: return "ABORT_TASK";
2803 case TMR_ABORT_TASK_SET: return "ABORT_TASK_SET";
2804 case TMR_CLEAR_ACA: return "CLEAR_ACA";
2805 case TMR_CLEAR_TASK_SET: return "CLEAR_TASK_SET";
2806 case TMR_LUN_RESET: return "LUN_RESET";
2807 case TMR_TARGET_WARM_RESET: return "TARGET_WARM_RESET";
2808 case TMR_TARGET_COLD_RESET: return "TARGET_COLD_RESET";
2809 case TMR_UNKNOWN: break;
2810 }
2811 return "(?)";
2812}
2813
2814void target_show_cmd(const char *pfx, struct se_cmd *cmd)
2815{
2816 char *ts_str = target_ts_to_str(cmd->transport_state);
2817 const u8 *cdb = cmd->t_task_cdb;
2818 struct se_tmr_req *tmf = cmd->se_tmr_req;
2819
2820 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2821 pr_debug("%scmd %#02x:%#02x with tag %#llx dir %s i_state %d t_state %s len %d refcnt %d transport_state %s\n",
2822 pfx, cdb[0], cdb[1], cmd->tag,
2823 data_dir_name(cmd->data_direction),
2824 cmd->se_tfo->get_cmd_state(cmd),
2825 cmd_state_name(cmd->t_state), cmd->data_length,
2826 kref_read(&cmd->cmd_kref), ts_str);
2827 } else {
2828 pr_debug("%stmf %s with tag %#llx ref_task_tag %#llx i_state %d t_state %s refcnt %d transport_state %s\n",
2829 pfx, target_tmf_name(tmf->function), cmd->tag,
2830 tmf->ref_task_tag, cmd->se_tfo->get_cmd_state(cmd),
2831 cmd_state_name(cmd->t_state),
2832 kref_read(&cmd->cmd_kref), ts_str);
2833 }
2834 kfree(ts_str);
2835}
2836EXPORT_SYMBOL(target_show_cmd);
2837
1c7b13fe
RD		 2838/* target_sess_cmd_list_set_waiting - Flag all commands in
2839 * sess_cmd_list to complete cmd_wait_comp. Set
2840 * sess_tearing_down so no more commands are queued.
2841 * @se_sess: session to flag
a17f091d 2842 */
1c7b13fe 2843void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d 2844{
1b4c59b7 2845 struct se_cmd *se_cmd, *tmp_cmd;
a17f091d 2846 unsigned long flags;
0f4a9431 2847 int rc;
a17f091d 2848
a17f091d 2849 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2850 if (se_sess->sess_tearing_down) {
2851 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2852 return;
2853 }
1c7b13fe 2854 se_sess->sess_tearing_down = 1;
9b31a328 2855 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2856
1b4c59b7
HR		 2857 list_for_each_entry_safe(se_cmd, tmp_cmd,
2858 &se_sess->sess_wait_list, se_cmd_list) {
0f4a9431
NB		 2859 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2860 if (rc) {
2861 se_cmd->cmd_wait_set = 1;
2862 spin_lock(&se_cmd->t_state_lock);
2863 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2864 spin_unlock(&se_cmd->t_state_lock);
1b4c59b7
HR		 2865 } else
2866 list_del_init(&se_cmd->se_cmd_list);
0f4a9431 2867 }
a17f091d
NB		 2868
2869 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2870}
1c7b13fe 2871EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2872
2873/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2874 * @se_sess: session to wait for active I/O
a17f091d 2875 */
be646c2d 2876void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2877{
2878 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2879 unsigned long flags;
0f4a9431 2880 bool tas;
a17f091d
NB		 2881
2882 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2883 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2884 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2885 " %d\n", se_cmd, se_cmd->t_state,
2886 se_cmd->se_tfo->get_cmd_state(se_cmd));
2887
0f4a9431
NB		 2888 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2889 tas = (se_cmd->transport_state & CMD_T_TAS);
2890 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2891
2892 if (!target_put_sess_cmd(se_cmd)) {
2893 if (tas)
2894 target_put_sess_cmd(se_cmd);
2895 }
2896
be646c2d
JE		 2897 wait_for_completion(&se_cmd->cmd_wait_comp);
2898 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2899 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2900 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2901
2902 se_cmd->se_tfo->release_cmd(se_cmd);
2903 }
9b31a328
NB		 2904
2905 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2906 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2907 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2908
a17f091d
NB		 2909}
2910EXPORT_SYMBOL(target_wait_for_sess_cmds);
2911
bd4e2d29
NB		 2912static void target_lun_confirm(struct percpu_ref *ref)
2913{
2914 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
2915
2916 complete(&lun->lun_ref_comp);
2917}
2918
b3eeea66 2919void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2920{
bd4e2d29
NB		 2921 /*
2922 * Mark the percpu-ref as DEAD, switch to atomic_t mode, drop
2923 * the initial reference and schedule confirm kill to be
2924 * executed after one full RCU grace period has completed.
2925 */
2926 percpu_ref_kill_and_confirm(&lun->lun_ref, target_lun_confirm);
2927 /*
2928 * The first completion waits for percpu_ref_switch_to_atomic_rcu()
2929 * to call target_lun_confirm after lun->lun_ref has been marked
2930 * as __PERCPU_REF_DEAD on all CPUs, and switches to atomic_t
2931 * mode so that percpu_ref_tryget_live() lookup of lun->lun_ref
2932 * fails for all new incoming I/O.
2933 */
5277797d 2934 wait_for_completion(&lun->lun_ref_comp);
bd4e2d29
NB		 2935 /*
2936 * The second completion waits for percpu_ref_put_many() to
2937 * invoke ->release() after lun->lun_ref has switched to
2938 * atomic_t mode, and lun->lun_ref.count has reached zero.
2939 *
2940 * At this point all target-core lun->lun_ref references have
2941 * been dropped via transport_lun_remove_cmd(), and it's safe
2942 * to proceed with the remaining LUN shutdown.
2943 */
2944 wait_for_completion(&lun->lun_shutdown_comp);
c66ac9db
NB		 2945}
2946
0f4a9431
NB		 2947static bool
2948__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2949 bool *aborted, bool *tas, unsigned long *flags)
2950 __releases(&cmd->t_state_lock)
2951 __acquires(&cmd->t_state_lock)
c66ac9db 2952{
c66ac9db 2953
0f4a9431
NB		 2954 assert_spin_locked(&cmd->t_state_lock);
2955 WARN_ON_ONCE(!irqs_disabled());
2956
2957 if (fabric_stop)
2958 cmd->transport_state |= CMD_T_FABRIC_STOP;
2959
2960 if (cmd->transport_state & CMD_T_ABORTED)
2961 *aborted = true;
2962
2963 if (cmd->transport_state & CMD_T_TAS)
2964 *tas = true;
2965
c8e31f26 2966 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
0f4a9431 2967 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2968 return false;
cb4f4d3c 2969
c8e31f26 2970 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
0f4a9431 2971 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2972 return false;
7d680f3b 2973
0f4a9431
NB		 2974 if (!(cmd->transport_state & CMD_T_ACTIVE))
2975 return false;
2976
2977 if (fabric_stop && *aborted)
a17f091d 2978 return false;
c66ac9db 2979
7d680f3b 2980 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2981
c00e6220 2982 target_show_cmd("wait_for_tasks: Stopping ", cmd);
c66ac9db 2983
0f4a9431 2984 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db 2985
c00e6220
BVA		 2986 while (!wait_for_completion_timeout(&cmd->t_transport_stop_comp,
2987 180 * HZ))
2988 target_show_cmd("wait for tasks: ", cmd);
c66ac9db 2989
0f4a9431 2990 spin_lock_irqsave(&cmd->t_state_lock, *flags);
7d680f3b 2991 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2992
0f4a9431
NB		 2993 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2994 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
c66ac9db 2995
0f4a9431
NB		 2996 return true;
2997}
2998
2999/**
2d4760ee
BVA		 3000 * transport_wait_for_tasks - set CMD_T_STOP and wait for t_transport_stop_comp
3001 * @cmd: command to wait on
0f4a9431
NB		 3002 */
3003bool transport_wait_for_tasks(struct se_cmd *cmd)
3004{
3005 unsigned long flags;
3006 bool ret, aborted = false, tas = false;
3007
3008 spin_lock_irqsave(&cmd->t_state_lock, flags);
3009 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
d14921d6 3010 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 3011
0f4a9431 3012 return ret;
c66ac9db 3013}
d14921d6 3014EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 3015
ab78fef4
BVA		 3016struct sense_info {
3017 u8 key;
3018 u8 asc;
3019 u8 ascq;
3020 bool add_sector_info;
3021};
3022
3023static const struct sense_info sense_info_table[] = {
3024 [TCM_NO_SENSE] = {
3025 .key = NOT_READY
3026 },
3027 [TCM_NON_EXISTENT_LUN] = {
3028 .key = ILLEGAL_REQUEST,
3029 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
3030 },
3031 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
3032 .key = ILLEGAL_REQUEST,
3033 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
3034 },
3035 [TCM_SECTOR_COUNT_TOO_MANY] = {
3036 .key = ILLEGAL_REQUEST,
3037 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
3038 },
3039 [TCM_UNKNOWN_MODE_PAGE] = {
3040 .key = ILLEGAL_REQUEST,
3041 .asc = 0x24, /* INVALID FIELD IN CDB */
3042 },
3043 [TCM_CHECK_CONDITION_ABORT_CMD] = {
3044 .key = ABORTED_COMMAND,
3045 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
3046 .ascq = 0x03,
3047 },
3048 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
3049 .key = ABORTED_COMMAND,
3050 .asc = 0x0c, /* WRITE ERROR */
3051 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
3052 },
3053 [TCM_INVALID_CDB_FIELD] = {
3054 .key = ILLEGAL_REQUEST,
3055 .asc = 0x24, /* INVALID FIELD IN CDB */
3056 },
3057 [TCM_INVALID_PARAMETER_LIST] = {
3058 .key = ILLEGAL_REQUEST,
3059 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
3060 },
e8642120
DD		 3061 [TCM_TOO_MANY_TARGET_DESCS] = {
3062 .key = ILLEGAL_REQUEST,
3063 .asc = 0x26,
3064 .ascq = 0x06, /* TOO MANY TARGET DESCRIPTORS */
3065 },
3066 [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = {
3067 .key = ILLEGAL_REQUEST,
3068 .asc = 0x26,
3069 .ascq = 0x07, /* UNSUPPORTED TARGET DESCRIPTOR TYPE CODE */
3070 },
3071 [TCM_TOO_MANY_SEGMENT_DESCS] = {
3072 .key = ILLEGAL_REQUEST,
3073 .asc = 0x26,
3074 .ascq = 0x08, /* TOO MANY SEGMENT DESCRIPTORS */
3075 },
3076 [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = {
3077 .key = ILLEGAL_REQUEST,
3078 .asc = 0x26,
3079 .ascq = 0x09, /* UNSUPPORTED SEGMENT DESCRIPTOR TYPE CODE */
3080 },
ab78fef4
BVA		 3081 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
3082 .key = ILLEGAL_REQUEST,
3083 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
3084 },
3085 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
3086 .key = ILLEGAL_REQUEST,
3087 .asc = 0x0c, /* WRITE ERROR */
3088 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
3089 },
3090 [TCM_SERVICE_CRC_ERROR] = {
3091 .key = ABORTED_COMMAND,
3092 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
3093 .ascq = 0x05, /* N/A */
3094 },
3095 [TCM_SNACK_REJECTED] = {
3096 .key = ABORTED_COMMAND,
3097 .asc = 0x11, /* READ ERROR */
3098 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
3099 },
3100 [TCM_WRITE_PROTECTED] = {
3101 .key = DATA_PROTECT,
3102 .asc = 0x27, /* WRITE PROTECTED */
3103 },
3104 [TCM_ADDRESS_OUT_OF_RANGE] = {
3105 .key = ILLEGAL_REQUEST,
3106 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
3107 },
3108 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
3109 .key = UNIT_ATTENTION,
3110 },
3111 [TCM_CHECK_CONDITION_NOT_READY] = {
3112 .key = NOT_READY,
3113 },
3114 [TCM_MISCOMPARE_VERIFY] = {
3115 .key = MISCOMPARE,
3116 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
3117 .ascq = 0x00,
3118 },
3119 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 3120 .key = ABORTED_COMMAND,
ab78fef4
BVA		 3121 .asc = 0x10,
3122 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
3123 .add_sector_info = true,
3124 },
3125 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 3126 .key = ABORTED_COMMAND,
ab78fef4
BVA		 3127 .asc = 0x10,
3128 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
3129 .add_sector_info = true,
3130 },
3131 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 3132 .key = ABORTED_COMMAND,
ab78fef4
BVA		 3133 .asc = 0x10,
3134 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
3135 .add_sector_info = true,
3136 },
449a1378
NB		 3137 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = {
3138 .key = COPY_ABORTED,
3139 .asc = 0x0d,
3140 .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */
3141
3142 },
ab78fef4
BVA		 3143 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
3144 /*
3145 * Returning ILLEGAL REQUEST would cause immediate IO errors on
3146 * Solaris initiators. Returning NOT READY instead means the
3147 * operations will be retried a finite number of times and we
3148 * can survive intermittent errors.
3149 */
3150 .key = NOT_READY,
3151 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
3152 },
79dd6f2f 3153 [TCM_INSUFFICIENT_REGISTRATION_RESOURCES] = {
3154 /*
3155 * From spc4r22 section5.7.7,5.7.8
3156 * If a PERSISTENT RESERVE OUT command with a REGISTER service action
3157 * or a REGISTER AND IGNORE EXISTING KEY service action or
3158 * REGISTER AND MOVE service actionis attempted,
3159 * but there are insufficient device server resources to complete the
3160 * operation, then the command shall be terminated with CHECK CONDITION
3161 * status, with the sense key set to ILLEGAL REQUEST,and the additonal
3162 * sense code set to INSUFFICIENT REGISTRATION RESOURCES.
3163 */
3164 .key = ILLEGAL_REQUEST,
3165 .asc = 0x55,
3166 .ascq = 0x04, /* INSUFFICIENT REGISTRATION RESOURCES */
3167 },
ab78fef4
BVA		 3168};
3169
f5a8b3a7 3170static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 3171{
3172 const struct sense_info *si;
3173 u8 *buffer = cmd->sense_buffer;
3174 int r = (__force int)reason;
3175 u8 asc, ascq;
4e4937e8 3176 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 3177
3178 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
3179 si = &sense_info_table[r];
3180 else
3181 si = &sense_info_table[(__force int)
3182 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
3183
ab78fef4
BVA		 3184 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
3185 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3186 WARN_ON_ONCE(asc == 0);
3187 } else if (si->asc == 0) {
3188 WARN_ON_ONCE(cmd->scsi_asc == 0);
3189 asc = cmd->scsi_asc;
3190 ascq = cmd->scsi_ascq;
3191 } else {
3192 asc = si->asc;
3193 ascq = si->ascq;
3194 }
9ec1e1ce 3195
4e4937e8 3196 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 3197 if (si->add_sector_info)
f5a8b3a7
SG		 3198 return scsi_set_sense_information(buffer,
3199 cmd->scsi_sense_length,
3200 cmd->bad_sector);
3201
3202 return 0;
ab78fef4
BVA		 3203}
3204
de103c93
CH		 3205int
3206transport_send_check_condition_and_sense(struct se_cmd *cmd,
3207 sense_reason_t reason, int from_transport)
c66ac9db 3208{
c66ac9db 3209 unsigned long flags;
c66ac9db 3210
a1d8b49a 3211 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3212 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 3213 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3214 return 0;
3215 }
3216 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 3217 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3218
ab78fef4 3219 if (!from_transport) {
f5a8b3a7
SG		 3220 int rc;
3221
c66ac9db 3222 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 3223 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3224 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 3225 rc = translate_sense_reason(cmd, reason);
3226 if (rc)
3227 return rc;
c66ac9db 3228 }
c66ac9db 3229
e5c0d6ad 3230 trace_target_cmd_complete(cmd);
07bde79a 3231 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3232}
3233EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3234
310d3d31
NB		 3235static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3236 __releases(&cmd->t_state_lock)
3237 __acquires(&cmd->t_state_lock)
c66ac9db 3238{
fa7e25cf
NB		 3239 int ret;
3240
310d3d31
NB		 3241 assert_spin_locked(&cmd->t_state_lock);
3242 WARN_ON_ONCE(!irqs_disabled());
3243
c18bc7d8
RD		 3244 if (!(cmd->transport_state & CMD_T_ABORTED))
3245 return 0;
68259b5a
AL		 3246 /*
3247 * If cmd has been aborted but either no status is to be sent or it has
3248 * already been sent, just return
3249 */
310d3d31
NB		 3250 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
3251 if (send_status)
3252 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c18bc7d8 3253 return 1;
310d3d31 3254 }
8b1e1244 3255
310d3d31
NB		 3256 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
3257 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3258
68259b5a 3259 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 3260 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 3261 trace_target_cmd_complete(cmd);
310d3d31
NB		 3262
3263 spin_unlock_irq(&cmd->t_state_lock);
fa7e25cf
NB		 3264 ret = cmd->se_tfo->queue_status(cmd);
3265 if (ret)
3266 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
310d3d31 3267 spin_lock_irq(&cmd->t_state_lock);
c18bc7d8
RD		 3268
3269 return 1;
c66ac9db 3270}
310d3d31
NB		 3271
3272int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3273{
3274 int ret;
3275
3276 spin_lock_irq(&cmd->t_state_lock);
3277 ret = __transport_check_aborted_status(cmd, send_status);
3278 spin_unlock_irq(&cmd->t_state_lock);
3279
3280 return ret;
3281}
c66ac9db
NB		 3282EXPORT_SYMBOL(transport_check_aborted_status);
3283
3284void transport_send_task_abort(struct se_cmd *cmd)
3285{
c252f003 3286 unsigned long flags;
fa7e25cf 3287 int ret;
c252f003
NB		 3288
3289 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 3290 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 3291 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3292 return;
3293 }
3294 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3295
c66ac9db
NB		 3296 /*
3297 * If there are still expected incoming fabric WRITEs, we wait
3298 * until until they have completed before sending a TASK_ABORTED
3299 * response. This response with TASK_ABORTED status will be
3300 * queued back to fabric module by transport_check_aborted_status().
3301 */
3302 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3303 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
310d3d31
NB		 3304 spin_lock_irqsave(&cmd->t_state_lock, flags);
3305 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
3306 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3307 goto send_abort;
3308 }
68259b5a 3309 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
310d3d31 3310 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
29f4c090 3311 return;
c66ac9db
NB		 3312 }
3313 }
310d3d31 3314send_abort:
c66ac9db 3315 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3316
72b59d6e
RD		 3317 transport_lun_remove_cmd(cmd);
3318
649ee054
BVA		 3319 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3320 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3321
e5c0d6ad 3322 trace_target_cmd_complete(cmd);
fa7e25cf
NB		 3323 ret = cmd->se_tfo->queue_status(cmd);
3324 if (ret)
3325 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db
NB		 3326}
3327
af877292 3328static void target_tmr_work(struct work_struct *work)
c66ac9db 3329{
af877292 3330 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3331 struct se_device *dev = cmd->se_dev;
c66ac9db 3332 struct se_tmr_req *tmr = cmd->se_tmr_req;
a6d9bb1c 3333 unsigned long flags;
c66ac9db
NB		 3334 int ret;
3335
a6d9bb1c
NB		 3336 spin_lock_irqsave(&cmd->t_state_lock, flags);
3337 if (cmd->transport_state & CMD_T_ABORTED) {
3338 tmr->response = TMR_FUNCTION_REJECTED;
3339 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3340 goto check_stop;
3341 }
3342 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3343
c66ac9db 3344 switch (tmr->function) {
5c6cd613 3345 case TMR_ABORT_TASK:
3d28934a 3346 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3347 break;
5c6cd613
NB		 3348 case TMR_ABORT_TASK_SET:
3349 case TMR_CLEAR_ACA:
3350 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3351 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3352 break;
5c6cd613 3353 case TMR_LUN_RESET:
c66ac9db
NB		 3354 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3355 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3356 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 3357 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3358 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3359 cmd->orig_fe_lun, 0x29,
3360 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3361 }
c66ac9db 3362 break;
5c6cd613 3363 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3364 tmr->response = TMR_FUNCTION_REJECTED;
3365 break;
5c6cd613 3366 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3367 tmr->response = TMR_FUNCTION_REJECTED;
3368 break;
c66ac9db 3369 default:
6708bb27 3370 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3371 tmr->function);
3372 tmr->response = TMR_FUNCTION_REJECTED;
3373 break;
3374 }
3375
a6d9bb1c
NB		 3376 spin_lock_irqsave(&cmd->t_state_lock, flags);
3377 if (cmd->transport_state & CMD_T_ABORTED) {
3378 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3379 goto check_stop;
3380 }
a6d9bb1c
NB		 3381 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3382
e3d6f909 3383 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3384
a6d9bb1c 3385check_stop:
eeb64d23 3386 transport_lun_remove_cmd(cmd);
b7b8bef7 3387 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3388}
3389
af877292
CH		 3390int transport_generic_handle_tmr(
3391 struct se_cmd *cmd)
c66ac9db 3392{
f15e9cd9 3393 unsigned long flags;
c54eeffb 3394 bool aborted = false;
f15e9cd9
NB		 3395
3396 spin_lock_irqsave(&cmd->t_state_lock, flags);
c54eeffb
NB		 3397 if (cmd->transport_state & CMD_T_ABORTED) {
3398 aborted = true;
3399 } else {
3400 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3401 cmd->transport_state |= CMD_T_ACTIVE;
3402 }
f15e9cd9
NB		 3403 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3404
c54eeffb
NB		 3405 if (aborted) {
3406 pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
3407 "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
3408 cmd->se_tmr_req->ref_task_tag, cmd->tag);
eeb64d23 3409 transport_lun_remove_cmd(cmd);
c54eeffb
NB		 3410 transport_cmd_check_stop_to_fabric(cmd);
3411 return 0;
3412 }
3413
af877292
CH		 3414 INIT_WORK(&cmd->work, target_tmr_work);
3415 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3416 return 0;
3417}
af877292 3418EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3419
3420bool
3421target_check_wce(struct se_device *dev)
3422{
3423 bool wce = false;
3424
3425 if (dev->transport->get_write_cache)
3426 wce = dev->transport->get_write_cache(dev);
3427 else if (dev->dev_attrib.emulate_write_cache > 0)
3428 wce = true;
3429
3430 return wce;
3431}
3432
3433bool
3434target_check_fua(struct se_device *dev)
3435{
3436 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3437}
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