]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - drivers/target/target_core_transport.c
projects / mirror_ubuntu-bionic-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
UBUNTU: Ubuntu-4.15.0-96.97
[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 318 unsigned char buf[PR_REG_ISID_LEN];
949c9d2e 319 unsigned long flags;
c66ac9db
NB		 320
321 se_sess->se_tpg = se_tpg;
322 se_sess->fabric_sess_ptr = fabric_sess_ptr;
323 /*
324 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
325 *
326 * Only set for struct se_session's that will actually be moving I/O.
327 * eg: *NOT* discovery sessions.
328 */
329 if (se_nacl) {
bffb5128
NB		 330 /*
331 *
332 * Determine if fabric allows for T10-PI feature bits exposed to
333 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
334 *
335 * If so, then always save prot_type on a per se_node_acl node
336 * basis and re-instate the previous sess_prot_type to avoid
337 * disabling PI from below any previously initiator side
338 * registered LUNs.
339 */
340 if (se_nacl->saved_prot_type)
341 se_sess->sess_prot_type = se_nacl->saved_prot_type;
342 else if (tfo->tpg_check_prot_fabric_only)
343 se_sess->sess_prot_type = se_nacl->saved_prot_type =
344 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 345 /*
346 * If the fabric module supports an ISID based TransportID,
347 * save this value in binary from the fabric I_T Nexus now.
348 */
e3d6f909 349 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 350 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 351 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 352 &buf[0], PR_REG_ISID_LEN);
353 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
354 }
afb999ff 355
949c9d2e 356 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 357 /*
358 * The se_nacl->nacl_sess pointer will be set to the
359 * last active I_T Nexus for each struct se_node_acl.
360 */
361 se_nacl->nacl_sess = se_sess;
362
363 list_add_tail(&se_sess->sess_acl_list,
364 &se_nacl->acl_sess_list);
949c9d2e 365 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 366 }
367 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
368
6708bb27 369 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 370 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 371}
372EXPORT_SYMBOL(__transport_register_session);
373
374void transport_register_session(
375 struct se_portal_group *se_tpg,
376 struct se_node_acl *se_nacl,
377 struct se_session *se_sess,
378 void *fabric_sess_ptr)
379{
140854cb
NB		 380 unsigned long flags;
381
382 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 383 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 384 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 385}
386EXPORT_SYMBOL(transport_register_session);
387
7861728d
NB		 388struct se_session *
389target_alloc_session(struct se_portal_group *tpg,
390 unsigned int tag_num, unsigned int tag_size,
391 enum target_prot_op prot_op,
392 const char *initiatorname, void *private,
393 int (*callback)(struct se_portal_group *,
394 struct se_session *, void *))
395{
396 struct se_session *sess;
397
398 /*
399 * If the fabric driver is using percpu-ida based pre allocation
400 * of I/O descriptor tags, go ahead and perform that setup now..
401 */
402 if (tag_num != 0)
403 sess = transport_init_session_tags(tag_num, tag_size, prot_op);
404 else
405 sess = transport_init_session(prot_op);
406
407 if (IS_ERR(sess))
408 return sess;
409
410 sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg,
411 (unsigned char *)initiatorname);
412 if (!sess->se_node_acl) {
413 transport_free_session(sess);
414 return ERR_PTR(-EACCES);
415 }
416 /*
417 * Go ahead and perform any remaining fabric setup that is
418 * required before transport_register_session().
419 */
420 if (callback != NULL) {
421 int rc = callback(tpg, sess, private);
422 if (rc) {
423 transport_free_session(sess);
424 return ERR_PTR(rc);
425 }
426 }
427
428 transport_register_session(tpg, sess->se_node_acl, sess, private);
429 return sess;
430}
431EXPORT_SYMBOL(target_alloc_session);
432
f8e471f9
NB		 433ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
434{
435 struct se_session *se_sess;
436 ssize_t len = 0;
437
438 spin_lock_bh(&se_tpg->session_lock);
439 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
440 if (!se_sess->se_node_acl)
441 continue;
442 if (!se_sess->se_node_acl->dynamic_node_acl)
443 continue;
444 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
445 break;
446
447 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
448 se_sess->se_node_acl->initiatorname);
449 len += 1; /* Include NULL terminator */
450 }
451 spin_unlock_bh(&se_tpg->session_lock);
452
453 return len;
454}
455EXPORT_SYMBOL(target_show_dynamic_sessions);
456
afb999ff
NB		 457static void target_complete_nacl(struct kref *kref)
458{
459 struct se_node_acl *nacl = container_of(kref,
460 struct se_node_acl, acl_kref);
01d4d673 461 struct se_portal_group *se_tpg = nacl->se_tpg;
afb999ff 462
01d4d673
NB		 463 if (!nacl->dynamic_stop) {
464 complete(&nacl->acl_free_comp);
465 return;
466 }
467
468 mutex_lock(&se_tpg->acl_node_mutex);
6f48655f 469 list_del_init(&nacl->acl_list);
01d4d673
NB		 470 mutex_unlock(&se_tpg->acl_node_mutex);
471
472 core_tpg_wait_for_nacl_pr_ref(nacl);
473 core_free_device_list_for_node(nacl, se_tpg);
474 kfree(nacl);
afb999ff
NB		 475}
476
477void target_put_nacl(struct se_node_acl *nacl)
478{
479 kref_put(&nacl->acl_kref, target_complete_nacl);
480}
21aaa23b 481EXPORT_SYMBOL(target_put_nacl);
afb999ff 482
c66ac9db
NB		 483void transport_deregister_session_configfs(struct se_session *se_sess)
484{
485 struct se_node_acl *se_nacl;
23388864 486 unsigned long flags;
c66ac9db
NB		 487 /*
488 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
489 */
490 se_nacl = se_sess->se_node_acl;
6708bb27 491 if (se_nacl) {
23388864 492 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
fba81f88
CH		 493 if (!list_empty(&se_sess->sess_acl_list))
494 list_del_init(&se_sess->sess_acl_list);
c66ac9db
NB		 495 /*
496 * If the session list is empty, then clear the pointer.
497 * Otherwise, set the struct se_session pointer from the tail
498 * element of the per struct se_node_acl active session list.
499 */
500 if (list_empty(&se_nacl->acl_sess_list))
501 se_nacl->nacl_sess = NULL;
502 else {
503 se_nacl->nacl_sess = container_of(
504 se_nacl->acl_sess_list.prev,
505 struct se_session, sess_acl_list);
506 }
23388864 507 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 508 }
509}
510EXPORT_SYMBOL(transport_deregister_session_configfs);
511
512void transport_free_session(struct se_session *se_sess)
513{
21aaa23b 514 struct se_node_acl *se_nacl = se_sess->se_node_acl;
01d4d673 515
21aaa23b
NB		 516 /*
517 * Drop the se_node_acl->nacl_kref obtained from within
518 * core_tpg_get_initiator_node_acl().
519 */
520 if (se_nacl) {
01d4d673
NB		 521 struct se_portal_group *se_tpg = se_nacl->se_tpg;
522 const struct target_core_fabric_ops *se_tfo = se_tpg->se_tpg_tfo;
523 unsigned long flags;
524
21aaa23b 525 se_sess->se_node_acl = NULL;
01d4d673
NB		 526
527 /*
528 * Also determine if we need to drop the extra ->cmd_kref if
529 * it had been previously dynamically generated, and
530 * the endpoint is not caching dynamic ACLs.
531 */
532 mutex_lock(&se_tpg->acl_node_mutex);
533 if (se_nacl->dynamic_node_acl &&
534 !se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
535 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
536 if (list_empty(&se_nacl->acl_sess_list))
537 se_nacl->dynamic_stop = true;
538 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
539
540 if (se_nacl->dynamic_stop)
6f48655f 541 list_del_init(&se_nacl->acl_list);
01d4d673
NB		 542 }
543 mutex_unlock(&se_tpg->acl_node_mutex);
544
545 if (se_nacl->dynamic_stop)
546 target_put_nacl(se_nacl);
547
21aaa23b
NB		 548 target_put_nacl(se_nacl);
549 }
c0add7fd
NB		 550 if (se_sess->sess_cmd_map) {
551 percpu_ida_destroy(&se_sess->sess_tag_pool);
de64d3a6 552 kvfree(se_sess->sess_cmd_map);
c0add7fd 553 }
c66ac9db
NB		 554 kmem_cache_free(se_sess_cache, se_sess);
555}
556EXPORT_SYMBOL(transport_free_session);
557
558void transport_deregister_session(struct se_session *se_sess)
559{
560 struct se_portal_group *se_tpg = se_sess->se_tpg;
e63a8e19 561 unsigned long flags;
c66ac9db 562
6708bb27 563 if (!se_tpg) {
c66ac9db
NB		 564 transport_free_session(se_sess);
565 return;
566 }
c66ac9db 567
e63a8e19 568 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 569 list_del(&se_sess->sess_list);
570 se_sess->se_tpg = NULL;
571 se_sess->fabric_sess_ptr = NULL;
e63a8e19 572 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db 573
6708bb27 574 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 575 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 576 /*
125d0119 577 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff 578 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
21aaa23b 579 * removal context from within transport_free_session() code.
01d4d673
NB		 580 *
581 * For dynamic ACL, target_put_nacl() uses target_complete_nacl()
582 * to release all remaining generate_node_acl=1 created ACL resources.
01468346 583 */
01468346 584
afb999ff 585 transport_free_session(se_sess);
c66ac9db
NB		 586}
587EXPORT_SYMBOL(transport_deregister_session);
588
cf572a96 589static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 590{
42bf829e 591 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 592 unsigned long flags;
593
42bf829e
CH		 594 if (!dev)
595 return;
c66ac9db 596
cf572a96
CH		 597 spin_lock_irqsave(&dev->execute_task_lock, flags);
598 if (cmd->state_active) {
599 list_del(&cmd->state_list);
cf572a96 600 cmd->state_active = false;
c66ac9db 601 }
cf572a96 602 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 603}
604
b1a2ecda 605static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
c66ac9db
NB		 606{
607 unsigned long flags;
608
b1a2ecda 609 target_remove_from_state_list(cmd);
f7113a47 610
b1a2ecda
BVA		 611 /*
612 * Clear struct se_cmd->se_lun before the handoff to FE.
613 */
614 cmd->se_lun = NULL;
f7113a47 615
febe562c 616 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 617 /*
618 * Determine if frontend context caller is requesting the stopping of
e3d6f909 619 * this command for frontend exceptions.
c66ac9db 620 */
7d680f3b 621 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 622 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
623 __func__, __LINE__, cmd->tag);
c66ac9db 624
a1d8b49a 625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 626
a95d6511 627 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 628 return 1;
629 }
f7113a47 630 cmd->transport_state &= ~CMD_T_ACTIVE;
a1d8b49a 631 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 632
b1a2ecda
BVA		 633 /*
634 * Some fabric modules like tcm_loop can release their internally
635 * allocated I/O reference and struct se_cmd now.
636 *
637 * Fabric modules are expected to return '1' here if the se_cmd being
638 * passed is released at this point, or zero if not being released.
639 */
9c28ca4f 640 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 641}
642
643static void transport_lun_remove_cmd(struct se_cmd *cmd)
644{
e3d6f909 645 struct se_lun *lun = cmd->se_lun;
c66ac9db 646
5259a06e 647 if (!lun)
c66ac9db
NB		 648 return;
649
5259a06e
NB		 650 if (cmpxchg(&cmd->lun_ref_active, true, false))
651 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 652}
653
73d4e580 654int transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
c66ac9db 655{
febe562c 656 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
73d4e580 657 int ret = 0;
febe562c 658
68259b5a
AL		 659 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
660 transport_lun_remove_cmd(cmd);
131e6abc
NB		 661 /*
662 * Allow the fabric driver to unmap any resources before
663 * releasing the descriptor via TFO->release_cmd()
664 */
665 if (remove)
666 cmd->se_tfo->aborted_task(cmd);
68259b5a 667
c66ac9db 668 if (transport_cmd_check_stop_to_fabric(cmd))
73d4e580 669 return 1;
febe562c 670 if (remove && ack_kref)
c0170698 671 ret = target_put_sess_cmd(cmd);
73d4e580
NB		 672
673 return ret;
c66ac9db
NB		 674}
675
35e0e757
CH		 676static void target_complete_failure_work(struct work_struct *work)
677{
678 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
679
de103c93
CH		 680 transport_generic_request_failure(cmd,
681 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 682}
683
6138ed2a 684/*
d5829eac
PB		 685 * Used when asking transport to copy Sense Data from the underlying
686 * Linux/SCSI struct scsi_cmnd
6138ed2a 687 */
d5829eac 688static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 689{
6138ed2a 690 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 691
692 WARN_ON(!cmd->se_lun);
693
694 if (!dev)
d5829eac 695 return NULL;
6138ed2a 696
d5829eac
PB		 697 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
698 return NULL;
6138ed2a 699
9c58b7dd 700 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 701
d5829eac 702 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 703 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 704 return cmd->sense_buffer;
6138ed2a
PB		 705}
706
c6d66aba
MC		 707void transport_copy_sense_to_cmd(struct se_cmd *cmd, unsigned char *sense)
708{
709 unsigned char *cmd_sense_buf;
710 unsigned long flags;
711
712 spin_lock_irqsave(&cmd->t_state_lock, flags);
713 cmd_sense_buf = transport_get_sense_buffer(cmd);
714 if (!cmd_sense_buf) {
715 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
716 return;
717 }
718
719 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
720 memcpy(cmd_sense_buf, sense, cmd->scsi_sense_length);
721 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
722}
723EXPORT_SYMBOL(transport_copy_sense_to_cmd);
724
5787cacd 725void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 726{
42bf829e 727 struct se_device *dev = cmd->se_dev;
402242c9 728 int success;
c66ac9db 729 unsigned long flags;
c66ac9db 730
5787cacd
CH		 731 cmd->scsi_status = scsi_status;
732
a1d8b49a 733 spin_lock_irqsave(&cmd->t_state_lock, flags);
402242c9
MC		 734 switch (cmd->scsi_status) {
735 case SAM_STAT_CHECK_CONDITION:
d5829eac 736 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 737 success = 1;
402242c9
MC		 738 else
739 success = 0;
740 break;
741 default:
9fe36984 742 success = 1;
402242c9 743 break;
c66ac9db
NB		 744 }
745
3d28934a 746 /*
125d0119 747 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 748 * and transport_wait_for_tasks() will be waiting for completion..
749 */
febe562c 750 if (cmd->transport_state & CMD_T_ABORTED ||
3d28934a
NB		 751 cmd->transport_state & CMD_T_STOP) {
752 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1d6ef276
JY		 753 /*
754 * If COMPARE_AND_WRITE was stopped by __transport_wait_for_tasks(),
755 * release se_device->caw_sem obtained by sbc_compare_and_write()
756 * since target_complete_ok_work() or target_complete_failure_work()
757 * won't be called to invoke the normal CAW completion callbacks.
758 */
759 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
760 up(&dev->caw_sem);
761 }
a95d6511 762 complete_all(&cmd->t_transport_stop_comp);
3d28934a 763 return;
3dca1471 764 } else if (!success) {
35e0e757 765 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 766 } else {
35e0e757 767 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 768 }
35e0e757 769
35e0e757 770 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 771 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 772 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 773
9095adaa 774 if (cmd->se_cmd_flags & SCF_USE_CPUID)
fb3269ba 775 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
9095adaa
QT		 776 else
777 queue_work(target_completion_wq, &cmd->work);
c66ac9db 778}
6bb35e00
CH		 779EXPORT_SYMBOL(target_complete_cmd);
780
2426bd45
RD		 781void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
782{
61f36166 783 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
2426bd45
RD		 784 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
785 cmd->residual_count += cmd->data_length - length;
786 } else {
787 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
788 cmd->residual_count = cmd->data_length - length;
789 }
790
791 cmd->data_length = length;
792 }
793
794 target_complete_cmd(cmd, scsi_status);
795}
796EXPORT_SYMBOL(target_complete_cmd_with_length);
797
cf572a96 798static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 799{
cf572a96
CH		 800 struct se_device *dev = cmd->se_dev;
801 unsigned long flags;
c66ac9db 802
cf572a96
CH		 803 spin_lock_irqsave(&dev->execute_task_lock, flags);
804 if (!cmd->state_active) {
805 list_add_tail(&cmd->state_list, &dev->state_list);
806 cmd->state_active = true;
c66ac9db 807 }
cf572a96 808 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 809}
810
07bde79a 811/*
f147abb4 812 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 813 */
7a6f0a1e
CH		 814static void transport_write_pending_qf(struct se_cmd *cmd);
815static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 816
0fd97ccf 817void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 818{
819 struct se_device *dev = container_of(work, struct se_device,
820 qf_work_queue);
bcac364a 821 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 822 struct se_cmd *cmd, *cmd_tmp;
823
824 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 825 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
826 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 827
bcac364a 828 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 829 list_del(&cmd->se_qf_node);
33940d09 830 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 831
6708bb27 832 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 833 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 834 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 835 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
836 : "UNKNOWN");
f7a5cc0b 837
7a6f0a1e
CH		 838 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
839 transport_write_pending_qf(cmd);
fa7e25cf
NB		 840 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK ||
841 cmd->t_state == TRANSPORT_COMPLETE_QF_ERR)
7a6f0a1e 842 transport_complete_qf(cmd);
07bde79a 843 }
07bde79a
NB		 844}
845
c66ac9db
NB		 846unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
847{
848 switch (cmd->data_direction) {
849 case DMA_NONE:
850 return "NONE";
851 case DMA_FROM_DEVICE:
852 return "READ";
853 case DMA_TO_DEVICE:
854 return "WRITE";
855 case DMA_BIDIRECTIONAL:
856 return "BIDI";
857 default:
858 break;
859 }
860
861 return "UNKNOWN";
862}
863
864void transport_dump_dev_state(
865 struct se_device *dev,
866 char *b,
867 int *bl)
868{
869 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 870 if (dev->export_count)
c66ac9db 871 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 872 else
c66ac9db 873 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 874
5f41a31d 875 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 876 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 877 dev->dev_attrib.block_size,
878 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 879 *bl += sprintf(b + *bl, " ");
880}
881
c66ac9db
NB		 882void transport_dump_vpd_proto_id(
883 struct t10_vpd *vpd,
884 unsigned char *p_buf,
885 int p_buf_len)
886{
887 unsigned char buf[VPD_TMP_BUF_SIZE];
888 int len;
889
890 memset(buf, 0, VPD_TMP_BUF_SIZE);
891 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
892
893 switch (vpd->protocol_identifier) {
894 case 0x00:
895 sprintf(buf+len, "Fibre Channel\n");
896 break;
897 case 0x10:
898 sprintf(buf+len, "Parallel SCSI\n");
899 break;
900 case 0x20:
901 sprintf(buf+len, "SSA\n");
902 break;
903 case 0x30:
904 sprintf(buf+len, "IEEE 1394\n");
905 break;
906 case 0x40:
907 sprintf(buf+len, "SCSI Remote Direct Memory Access"
908 " Protocol\n");
909 break;
910 case 0x50:
911 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
912 break;
913 case 0x60:
914 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
915 break;
916 case 0x70:
917 sprintf(buf+len, "Automation/Drive Interface Transport"
918 " Protocol\n");
919 break;
920 case 0x80:
921 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
922 break;
923 default:
924 sprintf(buf+len, "Unknown 0x%02x\n",
925 vpd->protocol_identifier);
926 break;
927 }
928
929 if (p_buf)
930 strncpy(p_buf, buf, p_buf_len);
931 else
6708bb27 932 pr_debug("%s", buf);
c66ac9db
NB		 933}
934
935void
936transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
937{
938 /*
939 * Check if the Protocol Identifier Valid (PIV) bit is set..
940 *
941 * from spc3r23.pdf section 7.5.1
942 */
943 if (page_83[1] & 0x80) {
944 vpd->protocol_identifier = (page_83[0] & 0xf0);
945 vpd->protocol_identifier_set = 1;
946 transport_dump_vpd_proto_id(vpd, NULL, 0);
947 }
948}
949EXPORT_SYMBOL(transport_set_vpd_proto_id);
950
951int transport_dump_vpd_assoc(
952 struct t10_vpd *vpd,
953 unsigned char *p_buf,
954 int p_buf_len)
955{
956 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 957 int ret = 0;
958 int len;
c66ac9db
NB		 959
960 memset(buf, 0, VPD_TMP_BUF_SIZE);
961 len = sprintf(buf, "T10 VPD Identifier Association: ");
962
963 switch (vpd->association) {
964 case 0x00:
965 sprintf(buf+len, "addressed logical unit\n");
966 break;
967 case 0x10:
968 sprintf(buf+len, "target port\n");
969 break;
970 case 0x20:
971 sprintf(buf+len, "SCSI target device\n");
972 break;
973 default:
974 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 975 ret = -EINVAL;
c66ac9db
NB		 976 break;
977 }
978
979 if (p_buf)
980 strncpy(p_buf, buf, p_buf_len);
981 else
6708bb27 982 pr_debug("%s", buf);
c66ac9db
NB		 983
984 return ret;
985}
986
987int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
988{
989 /*
990 * The VPD identification association..
991 *
992 * from spc3r23.pdf Section 7.6.3.1 Table 297
993 */
994 vpd->association = (page_83[1] & 0x30);
995 return transport_dump_vpd_assoc(vpd, NULL, 0);
996}
997EXPORT_SYMBOL(transport_set_vpd_assoc);
998
999int transport_dump_vpd_ident_type(
1000 struct t10_vpd *vpd,
1001 unsigned char *p_buf,
1002 int p_buf_len)
1003{
1004 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1005 int ret = 0;
1006 int len;
c66ac9db
NB		 1007
1008 memset(buf, 0, VPD_TMP_BUF_SIZE);
1009 len = sprintf(buf, "T10 VPD Identifier Type: ");
1010
1011 switch (vpd->device_identifier_type) {
1012 case 0x00:
1013 sprintf(buf+len, "Vendor specific\n");
1014 break;
1015 case 0x01:
1016 sprintf(buf+len, "T10 Vendor ID based\n");
1017 break;
1018 case 0x02:
1019 sprintf(buf+len, "EUI-64 based\n");
1020 break;
1021 case 0x03:
1022 sprintf(buf+len, "NAA\n");
1023 break;
1024 case 0x04:
1025 sprintf(buf+len, "Relative target port identifier\n");
1026 break;
1027 case 0x08:
1028 sprintf(buf+len, "SCSI name string\n");
1029 break;
1030 default:
1031 sprintf(buf+len, "Unsupported: 0x%02x\n",
1032 vpd->device_identifier_type);
e3d6f909 1033 ret = -EINVAL;
c66ac9db
NB		 1034 break;
1035 }
1036
e3d6f909
AG		 1037 if (p_buf) {
1038 if (p_buf_len < strlen(buf)+1)
1039 return -EINVAL;
c66ac9db 1040 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1041 } else {
6708bb27 1042 pr_debug("%s", buf);
e3d6f909 1043 }
c66ac9db
NB		 1044
1045 return ret;
1046}
1047
1048int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1049{
1050 /*
1051 * The VPD identifier type..
1052 *
1053 * from spc3r23.pdf Section 7.6.3.1 Table 298
1054 */
1055 vpd->device_identifier_type = (page_83[1] & 0x0f);
1056 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1057}
1058EXPORT_SYMBOL(transport_set_vpd_ident_type);
1059
1060int transport_dump_vpd_ident(
1061 struct t10_vpd *vpd,
1062 unsigned char *p_buf,
1063 int p_buf_len)
1064{
1065 unsigned char buf[VPD_TMP_BUF_SIZE];
1066 int ret = 0;
1067
1068 memset(buf, 0, VPD_TMP_BUF_SIZE);
1069
1070 switch (vpd->device_identifier_code_set) {
1071 case 0x01: /* Binary */
703d641d
DC		 1072 snprintf(buf, sizeof(buf),
1073 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1074 &vpd->device_identifier[0]);
1075 break;
1076 case 0x02: /* ASCII */
703d641d
DC		 1077 snprintf(buf, sizeof(buf),
1078 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1079 &vpd->device_identifier[0]);
1080 break;
1081 case 0x03: /* UTF-8 */
703d641d
DC		 1082 snprintf(buf, sizeof(buf),
1083 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1084 &vpd->device_identifier[0]);
1085 break;
1086 default:
1087 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1088 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1089 ret = -EINVAL;
c66ac9db
NB		 1090 break;
1091 }
1092
1093 if (p_buf)
1094 strncpy(p_buf, buf, p_buf_len);
1095 else
6708bb27 1096 pr_debug("%s", buf);
c66ac9db
NB		 1097
1098 return ret;
1099}
1100
1101int
1102transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1103{
1104 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1105 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1106
1107 /*
1108 * The VPD Code Set (encoding)
1109 *
1110 * from spc3r23.pdf Section 7.6.3.1 Table 296
1111 */
1112 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1113 switch (vpd->device_identifier_code_set) {
1114 case 0x01: /* Binary */
1115 vpd->device_identifier[j++] =
1116 hex_str[vpd->device_identifier_type];
1117 while (i < (4 + page_83[3])) {
1118 vpd->device_identifier[j++] =
1119 hex_str[(page_83[i] & 0xf0) >> 4];
1120 vpd->device_identifier[j++] =
1121 hex_str[page_83[i] & 0x0f];
1122 i++;
1123 }
1124 break;
1125 case 0x02: /* ASCII */
1126 case 0x03: /* UTF-8 */
1127 while (i < (4 + page_83[3]))
1128 vpd->device_identifier[j++] = page_83[i++];
1129 break;
1130 default:
1131 break;
1132 }
1133
1134 return transport_dump_vpd_ident(vpd, NULL, 0);
1135}
1136EXPORT_SYMBOL(transport_set_vpd_ident);
1137
8f9b5654
NB		 1138static sense_reason_t
1139target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1140 unsigned int size)
1141{
1142 u32 mtl;
1143
1144 if (!cmd->se_tfo->max_data_sg_nents)
1145 return TCM_NO_SENSE;
1146 /*
1147 * Check if fabric enforced maximum SGL entries per I/O descriptor
1148 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1149 * residual_count and reduce original cmd->data_length to maximum
1150 * length based on single PAGE_SIZE entry scatter-lists.
1151 */
1152 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1153 if (cmd->data_length > mtl) {
1154 /*
1155 * If an existing CDB overflow is present, calculate new residual
1156 * based on CDB size minus fabric maximum transfer length.
1157 *
1158 * If an existing CDB underflow is present, calculate new residual
1159 * based on original cmd->data_length minus fabric maximum transfer
1160 * length.
1161 *
1162 * Otherwise, set the underflow residual based on cmd->data_length
1163 * minus fabric maximum transfer length.
1164 */
1165 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1166 cmd->residual_count = (size - mtl);
1167 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1168 u32 orig_dl = size + cmd->residual_count;
1169 cmd->residual_count = (orig_dl - mtl);
1170 } else {
1171 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1172 cmd->residual_count = (cmd->data_length - mtl);
1173 }
1174 cmd->data_length = mtl;
1175 /*
1176 * Reset sbc_check_prot() calculated protection payload
1177 * length based upon the new smaller MTL.
1178 */
1179 if (cmd->prot_length) {
1180 u32 sectors = (mtl / dev->dev_attrib.block_size);
1181 cmd->prot_length = dev->prot_length * sectors;
1182 }
1183 }
1184 return TCM_NO_SENSE;
1185}
1186
de103c93
CH		 1187sense_reason_t
1188target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1189{
1190 struct se_device *dev = cmd->se_dev;
1191
1192 if (cmd->unknown_data_length) {
1193 cmd->data_length = size;
1194 } else if (size != cmd->data_length) {
4ff83daa 1195 pr_warn_ratelimited("TARGET_CORE[%s]: Expected Transfer Length:"
9b3b8041
CH		 1196 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1197 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1198 cmd->data_length, size, cmd->t_task_cdb[0]);
1199
4ff83daa
NB		 1200 if (cmd->data_direction == DMA_TO_DEVICE) {
1201 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1202 pr_err_ratelimited("Rejecting underflow/overflow"
1203 " for WRITE data CDB\n");
1204 return TCM_INVALID_CDB_FIELD;
1205 }
1206 /*
1207 * Some fabric drivers like iscsi-target still expect to
1208 * always reject overflow writes. Reject this case until
1209 * full fabric driver level support for overflow writes
1210 * is introduced tree-wide.
1211 */
1212 if (size > cmd->data_length) {
1213 pr_err_ratelimited("Rejecting overflow for"
1214 " WRITE control CDB\n");
1215 return TCM_INVALID_CDB_FIELD;
1216 }
9b3b8041
CH		 1217 }
1218 /*
1219 * Reject READ_* or WRITE_* with overflow/underflow for
1220 * type SCF_SCSI_DATA_CDB.
1221 */
0fd97ccf 1222 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1223 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1224 " CDB on non 512-byte sector setup subsystem"
1225 " plugin: %s\n", dev->transport->name);
1226 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1227 return TCM_INVALID_CDB_FIELD;
9b3b8041 1228 }
4c054ba6
NB		 1229 /*
1230 * For the overflow case keep the existing fabric provided
1231 * ->data_length. Otherwise for the underflow case, reset
1232 * ->data_length to the smaller SCSI expected data transfer
1233 * length.
1234 */
9b3b8041
CH		 1235 if (size > cmd->data_length) {
1236 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1237 cmd->residual_count = (size - cmd->data_length);
1238 } else {
1239 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1240 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1241 cmd->data_length = size;
9b3b8041 1242 }
9b3b8041
CH		 1243 }
1244
8f9b5654 1245 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1246
9b3b8041
CH		 1247}
1248
c66ac9db
NB		 1249/*
1250 * Used by fabric modules containing a local struct se_cmd within their
1251 * fabric dependent per I/O descriptor.
649ee054
BVA		 1252 *
1253 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1254 */
1255void transport_init_se_cmd(
1256 struct se_cmd *cmd,
9ac8928e 1257 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1258 struct se_session *se_sess,
1259 u32 data_length,
1260 int data_direction,
1261 int task_attr,
1262 unsigned char *sense_buffer)
1263{
5951146d 1264 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1265 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1266 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1267 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1268 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1269 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1270 spin_lock_init(&cmd->t_state_lock);
f2b72d6a 1271 INIT_WORK(&cmd->work, NULL);
1e1110c4 1272 kref_init(&cmd->cmd_kref);
c66ac9db
NB		 1273
1274 cmd->se_tfo = tfo;
1275 cmd->se_sess = se_sess;
1276 cmd->data_length = data_length;
1277 cmd->data_direction = data_direction;
1278 cmd->sam_task_attr = task_attr;
1279 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1280
1281 cmd->state_active = false;
c66ac9db
NB		 1282}
1283EXPORT_SYMBOL(transport_init_se_cmd);
1284
de103c93
CH		 1285static sense_reason_t
1286transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1287{
019c4ca6
CH		 1288 struct se_device *dev = cmd->se_dev;
1289
c66ac9db
NB		 1290 /*
1291 * Check if SAM Task Attribute emulation is enabled for this
1292 * struct se_device storage object
1293 */
a3541703 1294 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1295 return 0;
1296
68d81f40 1297 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1298 pr_debug("SAM Task Attribute ACA"
c66ac9db 1299 " emulation is not supported\n");
de103c93 1300 return TCM_INVALID_CDB_FIELD;
c66ac9db 1301 }
9c31820b 1302
c66ac9db
NB		 1303 return 0;
1304}
1305
de103c93
CH		 1306sense_reason_t
1307target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1308{
0fd97ccf 1309 struct se_device *dev = cmd->se_dev;
de103c93 1310 sense_reason_t ret;
c66ac9db 1311
c66ac9db
NB		 1312 /*
1313 * Ensure that the received CDB is less than the max (252 + 8) bytes
1314 * for VARIABLE_LENGTH_CMD
1315 */
1316 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1317 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1318 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1319 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1320 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1321 }
1322 /*
1323 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1324 * allocate the additional extended CDB buffer now.. Otherwise
1325 * setup the pointer from __t_task_cdb to t_task_cdb.
1326 */
a1d8b49a
AG		 1327 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1328 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1329 GFP_KERNEL);
6708bb27
AG		 1330 if (!cmd->t_task_cdb) {
1331 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1332 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1333 scsi_command_size(cdb),
a1d8b49a 1334 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1335 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1336 }
1337 } else
a1d8b49a 1338 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1339 /*
a1d8b49a 1340 * Copy the original CDB into cmd->
c66ac9db 1341 */
a1d8b49a 1342 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1343
e5c0d6ad
RD		 1344 trace_target_sequencer_start(cmd);
1345
0fd97ccf 1346 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1347 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1348 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1349 cmd->se_tfo->get_fabric_name(),
1350 cmd->se_sess->se_node_acl->initiatorname,
1351 cmd->t_task_cdb[0]);
de103c93
CH		 1352 if (ret)
1353 return ret;
1354
1355 ret = transport_check_alloc_task_attr(cmd);
1356 if (ret)
c66ac9db 1357 return ret;
cb4f4d3c 1358
cb4f4d3c 1359 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1360 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1361 return 0;
1362}
a12f41f8 1363EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1364
695434e1
NB		 1365/*
1366 * Used by fabric module frontends to queue tasks directly.
ac75d8be 1367 * May only be used from process context.
695434e1
NB		 1368 */
1369int transport_handle_cdb_direct(
1370 struct se_cmd *cmd)
1371{
de103c93 1372 sense_reason_t ret;
dd8ae59d 1373
695434e1
NB		 1374 if (!cmd->se_lun) {
1375 dump_stack();
6708bb27 1376 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1377 return -EINVAL;
1378 }
1379 if (in_interrupt()) {
1380 dump_stack();
6708bb27 1381 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1382 " from interrupt context\n");
1383 return -EINVAL;
1384 }
dd8ae59d 1385 /*
af877292
CH		 1386 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1387 * outstanding descriptors are handled correctly during shutdown via
1388 * transport_wait_for_tasks()
dd8ae59d
NB		 1389 *
1390 * Also, we don't take cmd->t_state_lock here as we only expect
1391 * this to be called for initial descriptor submission.
1392 */
1393 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1394 cmd->transport_state |= CMD_T_ACTIVE;
1395
dd8ae59d
NB		 1396 /*
1397 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1398 * so follow TRANSPORT_NEW_CMD processing thread context usage
1399 * and call transport_generic_request_failure() if necessary..
1400 */
1401 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1402 if (ret)
1403 transport_generic_request_failure(cmd, ret);
dd8ae59d 1404 return 0;
695434e1
NB		 1405}
1406EXPORT_SYMBOL(transport_handle_cdb_direct);
1407
c5ff8d6b 1408sense_reason_t
de103c93
CH		 1409transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1410 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1411{
1412 if (!sgl || !sgl_count)
1413 return 0;
1414
1415 /*
1416 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1417 * scatterlists already have been set to follow what the fabric
1418 * passes for the original expected data transfer length.
1419 */
1420 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1421 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1422 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1423 return TCM_INVALID_CDB_FIELD;
1424 }
1425
1426 cmd->t_data_sg = sgl;
1427 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1428 cmd->t_bidi_data_sg = sgl_bidi;
1429 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1430
de103c93
CH		 1431 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1432 return 0;
1433}
1434
a026757f
NB		 1435/*
1436 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1437 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1438 *
1439 * @se_cmd: command descriptor to submit
1440 * @se_sess: associated se_sess for endpoint
1441 * @cdb: pointer to SCSI CDB
1442 * @sense: pointer to SCSI sense buffer
1443 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1444 * @data_length: fabric expected data transfer length
1445 * @task_addr: SAM task attribute
1446 * @data_dir: DMA data direction
1447 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1448 * @sgl: struct scatterlist memory for unidirectional mapping
1449 * @sgl_count: scatterlist count for unidirectional mapping
1450 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1451 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1452 * @sgl_prot: struct scatterlist memory protection information
1453 * @sgl_prot_count: scatterlist count for protection information
a6360785 1454 *
649ee054
BVA		 1455 * Task tags are supported if the caller has set @se_cmd->tag.
1456 *
d6dfc868
RD		 1457 * Returns non zero to signal active I/O shutdown failure. All other
1458 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1459 * but still return zero here.
1460 *
a6360785
NB		 1461 * This may only be called from process context, and also currently
1462 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1463 */
1464int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1465 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1466 u32 data_length, int task_attr, int data_dir, int flags,
1467 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1468 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1469 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1470{
1471 struct se_portal_group *se_tpg;
de103c93
CH		 1472 sense_reason_t rc;
1473 int ret;
a6360785
NB		 1474
1475 se_tpg = se_sess->se_tpg;
1476 BUG_ON(!se_tpg);
1477 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1478 BUG_ON(in_interrupt());
1479 /*
1480 * Initialize se_cmd for target operation. From this point
1481 * exceptions are handled by sending exception status via
1482 * target_core_fabric_ops->queue_status() callback
1483 */
1484 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1485 data_length, data_dir, task_attr, sense);
9095adaa
QT		 1486
1487 if (flags & TARGET_SCF_USE_CPUID)
1488 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1489 else
1490 se_cmd->cpuid = WORK_CPU_UNBOUND;
1491
b0d79946
SAS		 1492 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1493 se_cmd->unknown_data_length = 1;
a6360785
NB		 1494 /*
1495 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1496 * se_sess->sess_cmd_list. A second kref_get here is necessary
1497 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1498 * kref_put() to happen during fabric packet acknowledgement.
1499 */
afc16604 1500 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1501 if (ret)
1502 return ret;
a6360785
NB		 1503 /*
1504 * Signal bidirectional data payloads to target-core
1505 */
1506 if (flags & TARGET_SCF_BIDI_OP)
1507 se_cmd->se_cmd_flags |= SCF_BIDI;
1508 /*
1509 * Locate se_lun pointer and attach it to struct se_cmd
1510 */
de103c93
CH		 1511 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1512 if (rc) {
1513 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1514 target_put_sess_cmd(se_cmd);
d6dfc868 1515 return 0;
735703ca 1516 }
b5b8e298
SG		 1517
1518 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1519 if (rc != 0) {
1520 transport_generic_request_failure(se_cmd, rc);
1521 return 0;
1522 }
1523
def2b339
NB		 1524 /*
1525 * Save pointers for SGLs containing protection information,
1526 * if present.
1527 */
1528 if (sgl_prot_count) {
1529 se_cmd->t_prot_sg = sgl_prot;
1530 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1531 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1532 }
d6e0175c 1533
a026757f
NB		 1534 /*
1535 * When a non zero sgl_count has been passed perform SGL passthrough
1536 * mapping for pre-allocated fabric memory instead of having target
1537 * core perform an internal SGL allocation..
1538 */
1539 if (sgl_count != 0) {
1540 BUG_ON(!sgl);
1541
944981c7
NB		 1542 /*
1543 * A work-around for tcm_loop as some userspace code via
1544 * scsi-generic do not memset their associated read buffers,
1545 * so go ahead and do that here for type non-data CDBs. Also
1546 * note that this is currently guaranteed to be a single SGL
1547 * for this case by target core in target_setup_cmd_from_cdb()
1548 * -> transport_generic_cmd_sequencer().
1549 */
1550 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1551 se_cmd->data_direction == DMA_FROM_DEVICE) {
1552 unsigned char *buf = NULL;
1553
1554 if (sgl)
1555 buf = kmap(sg_page(sgl)) + sgl->offset;
1556
1557 if (buf) {
1558 memset(buf, 0, sgl->length);
1559 kunmap(sg_page(sgl));
1560 }
1561 }
1562
a026757f
NB		 1563 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1564 sgl_bidi, sgl_bidi_count);
1565 if (rc != 0) {
de103c93 1566 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1567 return 0;
1568 }
1569 }
def2b339 1570
11e319ed
AG		 1571 /*
1572 * Check if we need to delay processing because of ALUA
1573 * Active/NonOptimized primary access state..
1574 */
1575 core_alua_check_nonop_delay(se_cmd);
1576
a6360785 1577 transport_handle_cdb_direct(se_cmd);
d6dfc868 1578 return 0;
a6360785 1579}
a026757f
NB		 1580EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1581
1582/*
1583 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1584 *
1585 * @se_cmd: command descriptor to submit
1586 * @se_sess: associated se_sess for endpoint
1587 * @cdb: pointer to SCSI CDB
1588 * @sense: pointer to SCSI sense buffer
1589 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1590 * @data_length: fabric expected data transfer length
1591 * @task_addr: SAM task attribute
1592 * @data_dir: DMA data direction
1593 * @flags: flags for command submission from target_sc_flags_tables
1594 *
649ee054
BVA		 1595 * Task tags are supported if the caller has set @se_cmd->tag.
1596 *
a026757f
NB		 1597 * Returns non zero to signal active I/O shutdown failure. All other
1598 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1599 * but still return zero here.
1600 *
1601 * This may only be called from process context, and also currently
1602 * assumes internal allocation of fabric payload buffer by target-core.
1603 *
1604 * It also assumes interal target core SGL memory allocation.
1605 */
1606int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1607 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1608 u32 data_length, int task_attr, int data_dir, int flags)
1609{
1610 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1611 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1612 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1613}
a6360785
NB		 1614EXPORT_SYMBOL(target_submit_cmd);
1615
9f0d05c2
NB		 1616static void target_complete_tmr_failure(struct work_struct *work)
1617{
1618 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1619
1620 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1621 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0 1622
eeb64d23 1623 transport_lun_remove_cmd(se_cmd);
5a3b6fc0 1624 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1625}
1626
5465e7d3
NB		 1627static bool target_lookup_lun_from_tag(struct se_session *se_sess, u64 tag,
1628 u64 *unpacked_lun)
1629{
1630 struct se_cmd *se_cmd;
1631 unsigned long flags;
1632 bool ret = false;
1633
1634 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
1635 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) {
1636 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
1637 continue;
1638
1639 if (se_cmd->tag == tag) {
1640 *unpacked_lun = se_cmd->orig_fe_lun;
1641 ret = true;
1642 break;
1643 }
1644 }
1645 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
1646
1647 return ret;
1648}
1649
ea98d7f9
AG		 1650/**
1651 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1652 * for TMR CDBs
1653 *
1654 * @se_cmd: command descriptor to submit
1655 * @se_sess: associated se_sess for endpoint
1656 * @sense: pointer to SCSI sense buffer
1657 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1658 * @fabric_context: fabric context for TMR req
1659 * @tm_type: Type of TM request
c0974f89
NB		 1660 * @gfp: gfp type for caller
1661 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1662 * @flags: submit cmd flags
ea98d7f9
AG		 1663 *
1664 * Callable from all contexts.
1665 **/
1666
c7042cae 1667int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1668 unsigned char *sense, u64 unpacked_lun,
c0974f89 1669 void *fabric_tmr_ptr, unsigned char tm_type,
5261d86c 1670 gfp_t gfp, u64 tag, int flags)
ea98d7f9
AG		 1671{
1672 struct se_portal_group *se_tpg;
1673 int ret;
1674
1675 se_tpg = se_sess->se_tpg;
1676 BUG_ON(!se_tpg);
1677
1678 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1679 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1680 /*
1681 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1682 * allocation failure.
1683 */
c0974f89 1684 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1685 if (ret < 0)
1686 return -ENOMEM;
ea98d7f9 1687
c0974f89
NB		 1688 if (tm_type == TMR_ABORT_TASK)
1689 se_cmd->se_tmr_req->ref_task_tag = tag;
1690
ea98d7f9 1691 /* See target_submit_cmd for commentary */
afc16604 1692 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1693 if (ret) {
1694 core_tmr_release_req(se_cmd->se_tmr_req);
1695 return ret;
1696 }
5465e7d3
NB		 1697 /*
1698 * If this is ABORT_TASK with no explicit fabric provided LUN,
1699 * go ahead and search active session tags for a match to figure
1700 * out unpacked_lun for the original se_cmd.
1701 */
1702 if (tm_type == TMR_ABORT_TASK && (flags & TARGET_SCF_LOOKUP_LUN_FROM_TAG)) {
1703 if (!target_lookup_lun_from_tag(se_sess, tag, &unpacked_lun))
1704 goto failure;
1705 }
ea98d7f9 1706
ea98d7f9 1707 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
5465e7d3
NB		 1708 if (ret)
1709 goto failure;
1710
ea98d7f9 1711 transport_generic_handle_tmr(se_cmd);
c7042cae 1712 return 0;
5465e7d3
NB		 1713
1714 /*
1715 * For callback during failure handling, push this work off
1716 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1717 */
1718failure:
1719 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1720 schedule_work(&se_cmd->work);
1721 return 0;
ea98d7f9
AG		 1722}
1723EXPORT_SYMBOL(target_submit_tmr);
1724
c66ac9db
NB		 1725/*
1726 * Handle SAM-esque emulation for generic transport request failures.
1727 */
de103c93
CH		 1728void transport_generic_request_failure(struct se_cmd *cmd,
1729 sense_reason_t sense_reason)
c66ac9db 1730{
057085e5 1731 int ret = 0, post_ret = 0;
07bde79a 1732
c00e6220
BVA		 1733 pr_debug("-----[ Storage Engine Exception; sense_reason %d\n",
1734 sense_reason);
1735 target_show_cmd("-----[ ", cmd);
c66ac9db 1736
c66ac9db
NB		 1737 /*
1738 * For SAM Task Attribute emulation for failed struct se_cmd
1739 */
019c4ca6 1740 transport_complete_task_attr(cmd);
fd2f928b 1741
cf6d1f09
NB		 1742 /*
1743 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1744 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1745 */
1746 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1747 cmd->transport_complete_callback)
057085e5 1748 cmd->transport_complete_callback(cmd, false, &post_ret);
c66ac9db 1749
fd2f928b
NB		 1750 if (transport_check_aborted_status(cmd, 1))
1751 return;
1752
de103c93 1753 switch (sense_reason) {
03e98c9e
NB		 1754 case TCM_NON_EXISTENT_LUN:
1755 case TCM_UNSUPPORTED_SCSI_OPCODE:
1756 case TCM_INVALID_CDB_FIELD:
1757 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1758 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1759 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1760 case TCM_UNKNOWN_MODE_PAGE:
1761 case TCM_WRITE_PROTECTED:
e2397c70 1762 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1763 case TCM_CHECK_CONDITION_ABORT_CMD:
1764 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1765 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1766 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1767 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1768 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
449a1378 1769 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE:
e8642120
DD		 1770 case TCM_TOO_MANY_TARGET_DESCS:
1771 case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE:
1772 case TCM_TOO_MANY_SEGMENT_DESCS:
1773 case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE:
c66ac9db 1774 break;
de103c93 1775 case TCM_OUT_OF_RESOURCES:
a271eac4
MC		 1776 cmd->scsi_status = SAM_STAT_TASK_SET_FULL;
1777 goto queue_status;
03e98c9e 1778 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1779 /*
1780 * No SENSE Data payload for this case, set SCSI Status
1781 * and queue the response to $FABRIC_MOD.
1782 *
1783 * Uses linux/include/scsi/scsi.h SAM status codes defs
1784 */
1785 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1786 /*
1787 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1788 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1789 * CONFLICT STATUS.
1790 *
1791 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1792 */
e3d6f909 1793 if (cmd->se_sess &&
c51c8e7b
HR		 1794 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1795 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1796 cmd->orig_fe_lun, 0x2C,
1797 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1798 }
a271eac4
MC		 1799
1800 goto queue_status;
c66ac9db 1801 default:
6708bb27 1802 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1803 cmd->t_task_cdb[0], sense_reason);
1804 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1805 break;
1806 }
f3146437 1807
de103c93 1808 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
fa7e25cf 1809 if (ret)
03e98c9e 1810 goto queue_full;
07bde79a 1811
c66ac9db
NB		 1812check_stop:
1813 transport_lun_remove_cmd(cmd);
06b967e4 1814 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1815 return;
1816
a271eac4
MC		 1817queue_status:
1818 trace_target_cmd_complete(cmd);
1819 ret = cmd->se_tfo->queue_status(cmd);
1820 if (!ret)
1821 goto check_stop;
07bde79a 1822queue_full:
fa7e25cf 1823 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db 1824}
2fbff127 1825EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1826
dff0ca9e 1827void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
c66ac9db 1828{
de103c93 1829 sense_reason_t ret;
5f41a31d 1830
dff0ca9e
NB		 1831 if (!cmd->execute_cmd) {
1832 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1833 goto err;
1834 }
1835 if (do_checks) {
1836 /*
1837 * Check for an existing UNIT ATTENTION condition after
1838 * target_handle_task_attr() has done SAM task attr
1839 * checking, and possibly have already defered execution
1840 * out to target_restart_delayed_cmds() context.
1841 */
1842 ret = target_scsi3_ua_check(cmd);
1843 if (ret)
1844 goto err;
1845
1846 ret = target_alua_state_check(cmd);
1847 if (ret)
1848 goto err;
5f41a31d 1849
dff0ca9e
NB		 1850 ret = target_check_reservation(cmd);
1851 if (ret) {
1852 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1853 goto err;
de103c93 1854 }
5f41a31d 1855 }
dff0ca9e
NB		 1856
1857 ret = cmd->execute_cmd(cmd);
1858 if (!ret)
1859 return;
1860err:
1861 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1862 cmd->transport_state &= ~CMD_T_SENT;
dff0ca9e
NB		 1863 spin_unlock_irq(&cmd->t_state_lock);
1864
1865 transport_generic_request_failure(cmd, ret);
5f41a31d
CH		 1866}
1867
aa58b531
NB		 1868static int target_write_prot_action(struct se_cmd *cmd)
1869{
5132d1e6 1870 u32 sectors;
aa58b531
NB		 1871 /*
1872 * Perform WRITE_INSERT of PI using software emulation when backend
1873 * device has PI enabled, if the transport has not already generated
1874 * PI using hardware WRITE_INSERT offload.
1875 */
1876 switch (cmd->prot_op) {
1877 case TARGET_PROT_DOUT_INSERT:
1878 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1879 sbc_dif_generate(cmd);
1880 break;
5132d1e6
NB		 1881 case TARGET_PROT_DOUT_STRIP:
1882 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1883 break;
1884
1885 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1886 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1887 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1888 if (unlikely(cmd->pi_err)) {
1889 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1890 cmd->transport_state &= ~CMD_T_SENT;
5132d1e6
NB		 1891 spin_unlock_irq(&cmd->t_state_lock);
1892 transport_generic_request_failure(cmd, cmd->pi_err);
1893 return -1;
1894 }
1895 break;
aa58b531
NB		 1896 default:
1897 break;
1898 }
1899
1900 return 0;
1901}
1902
019c4ca6 1903static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1904{
1905 struct se_device *dev = cmd->se_dev;
1906
a3541703 1907 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1908 return false;
5f41a31d 1909
410c29df
NB		 1910 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1911
c66ac9db 1912 /*
25985edc 1913 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1914 * to allow the passed struct se_cmd list of tasks to the front of the list.
1915 */
5f41a31d 1916 switch (cmd->sam_task_attr) {
68d81f40 1917 case TCM_HEAD_TAG:
9c31820b
RD		 1918 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1919 cmd->t_task_cdb[0]);
019c4ca6 1920 return false;
68d81f40 1921 case TCM_ORDERED_TAG:
33940d09 1922 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1923
9c31820b
RD		 1924 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1925 cmd->t_task_cdb[0]);
5f41a31d 1926
c66ac9db 1927 /*
5f41a31d
CH		 1928 * Execute an ORDERED command if no other older commands
1929 * exist that need to be completed first.
c66ac9db 1930 */
5f41a31d 1931 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1932 return false;
5f41a31d
CH		 1933 break;
1934 default:
c66ac9db
NB		 1935 /*
1936 * For SIMPLE and UNTAGGED Task Attribute commands
1937 */
33940d09 1938 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1939 break;
c66ac9db 1940 }
5f41a31d 1941
019c4ca6
CH		 1942 if (atomic_read(&dev->dev_ordered_sync) == 0)
1943 return false;
c66ac9db 1944
019c4ca6
CH		 1945 spin_lock(&dev->delayed_cmd_lock);
1946 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1947 spin_unlock(&dev->delayed_cmd_lock);
1948
9c31820b
RD		 1949 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1950 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1951 return true;
1952}
1953
310d3d31
NB		 1954static int __transport_check_aborted_status(struct se_cmd *, int);
1955
019c4ca6
CH		 1956void target_execute_cmd(struct se_cmd *cmd)
1957{
019c4ca6
CH		 1958 /*
1959 * Determine if frontend context caller is requesting the stopping of
1960 * this command for frontend exceptions.
310d3d31
NB		 1961 *
1962 * If the received CDB has aleady been aborted stop processing it here.
019c4ca6 1963 */
4a9a6c8d 1964 spin_lock_irq(&cmd->t_state_lock);
310d3d31
NB		 1965 if (__transport_check_aborted_status(cmd, 1)) {
1966 spin_unlock_irq(&cmd->t_state_lock);
1967 return;
1968 }
019c4ca6 1969 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1970 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1971 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1972
1973 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1974 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1975 return;
1976 }
1977
1978 cmd->t_state = TRANSPORT_PROCESSING;
1c21a480 1979 cmd->transport_state &= ~CMD_T_PRE_EXECUTE;
fd5e64de 1980 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT;
019c4ca6 1981 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1982
1983 if (target_write_prot_action(cmd))
1984 return;
019c4ca6 1985
1a398b97
NB		 1986 if (target_handle_task_attr(cmd)) {
1987 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1988 cmd->transport_state &= ~CMD_T_SENT;
1a398b97
NB		 1989 spin_unlock_irq(&cmd->t_state_lock);
1990 return;
1991 }
1992
dff0ca9e 1993 __target_execute_cmd(cmd, true);
c66ac9db 1994}
70baf0ab 1995EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1996
5f41a31d
CH		 1997/*
1998 * Process all commands up to the last received ORDERED task attribute which
1999 * requires another blocking boundary
2000 */
2001static void target_restart_delayed_cmds(struct se_device *dev)
2002{
2003 for (;;) {
2004 struct se_cmd *cmd;
2005
2006 spin_lock(&dev->delayed_cmd_lock);
2007 if (list_empty(&dev->delayed_cmd_list)) {
2008 spin_unlock(&dev->delayed_cmd_lock);
2009 break;
2010 }
2011
2012 cmd = list_entry(dev->delayed_cmd_list.next,
2013 struct se_cmd, se_delayed_node);
2014 list_del(&cmd->se_delayed_node);
2015 spin_unlock(&dev->delayed_cmd_lock);
2016
1c79df1f
NB		 2017 cmd->transport_state |= CMD_T_SENT;
2018
dff0ca9e 2019 __target_execute_cmd(cmd, true);
5f41a31d 2020
68d81f40 2021 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 2022 break;
2023 }
2024}
2025
c66ac9db 2026/*
35e0e757 2027 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 2028 * and ordered cmds need to have their tasks added to the execution queue.
2029 */
2030static void transport_complete_task_attr(struct se_cmd *cmd)
2031{
5951146d 2032 struct se_device *dev = cmd->se_dev;
c66ac9db 2033
a3541703 2034 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 2035 return;
2036
410c29df
NB		 2037 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
2038 goto restart;
2039
68d81f40 2040 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 2041 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 2042 dev->dev_cur_ordered_id++;
68d81f40 2043 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 2044 dev->dev_cur_ordered_id++;
9c31820b
RD		 2045 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
2046 dev->dev_cur_ordered_id);
68d81f40 2047 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 2048 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 2049
2050 dev->dev_cur_ordered_id++;
9c31820b
RD		 2051 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
2052 dev->dev_cur_ordered_id);
c66ac9db 2053 }
1c79df1f
NB		 2054 cmd->se_cmd_flags &= ~SCF_TASK_ATTR_SET;
2055
410c29df 2056restart:
5f41a31d 2057 target_restart_delayed_cmds(dev);
c66ac9db
NB		 2058}
2059
e057f533 2060static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 2061{
2062 int ret = 0;
2063
019c4ca6 2064 transport_complete_task_attr(cmd);
fa7e25cf
NB		 2065 /*
2066 * If a fabric driver ->write_pending() or ->queue_data_in() callback
2067 * has returned neither -ENOMEM or -EAGAIN, assume it's fatal and
2068 * the same callbacks should not be retried. Return CHECK_CONDITION
2069 * if a scsi_status is not already set.
2070 *
2071 * If a fabric driver ->queue_status() has returned non zero, always
2072 * keep retrying no matter what..
2073 */
2074 if (cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) {
2075 if (cmd->scsi_status)
2076 goto queue_status;
e057f533 2077
fa7e25cf
NB		 2078 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2079 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2080 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2081 translate_sense_reason(cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
2082 goto queue_status;
e057f533 2083 }
07bde79a 2084
fa7e25cf
NB		 2085 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
2086 goto queue_status;
2087
07bde79a
NB		 2088 switch (cmd->data_direction) {
2089 case DMA_FROM_DEVICE:
4347ab5a
NB		 2090 if (cmd->scsi_status)
2091 goto queue_status;
2092
e5c0d6ad 2093 trace_target_cmd_complete(cmd);
07bde79a
NB		 2094 ret = cmd->se_tfo->queue_data_in(cmd);
2095 break;
2096 case DMA_TO_DEVICE:
64577407 2097 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 2098 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 2099 break;
07bde79a 2100 }
d7e595dd 2101 /* fall through */
07bde79a 2102 case DMA_NONE:
4347ab5a 2103queue_status:
e5c0d6ad 2104 trace_target_cmd_complete(cmd);
07bde79a
NB		 2105 ret = cmd->se_tfo->queue_status(cmd);
2106 break;
2107 default:
2108 break;
2109 }
2110
e057f533 2111 if (ret < 0) {
fa7e25cf 2112 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
e057f533
CH		 2113 return;
2114 }
2115 transport_lun_remove_cmd(cmd);
2116 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2117}
2118
fa7e25cf
NB		 2119static void transport_handle_queue_full(struct se_cmd *cmd, struct se_device *dev,
2120 int err, bool write_pending)
07bde79a 2121{
fa7e25cf
NB		 2122 /*
2123 * -EAGAIN or -ENOMEM signals retry of ->write_pending() and/or
2124 * ->queue_data_in() callbacks from new process context.
2125 *
2126 * Otherwise for other errors, transport_complete_qf() will send
2127 * CHECK_CONDITION via ->queue_status() instead of attempting to
2128 * retry associated fabric driver data-transfer callbacks.
2129 */
2130 if (err == -EAGAIN || err == -ENOMEM) {
2131 cmd->t_state = (write_pending) ? TRANSPORT_COMPLETE_QF_WP :
2132 TRANSPORT_COMPLETE_QF_OK;
2133 } else {
2134 pr_warn_ratelimited("Got unknown fabric queue status: %d\n", err);
2135 cmd->t_state = TRANSPORT_COMPLETE_QF_ERR;
2136 }
2137
07bde79a 2138 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 2139 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 2140 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 2141 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2142
2143 schedule_work(&cmd->se_dev->qf_work_queue);
2144}
2145
fdeab852 2146static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2147{
fdeab852
NB		 2148 switch (cmd->prot_op) {
2149 case TARGET_PROT_DIN_STRIP:
2150 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2151 u32 sectors = cmd->data_length >>
2152 ilog2(cmd->se_dev->dev_attrib.block_size);
2153
2154 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2155 sectors, 0, cmd->t_prot_sg,
2156 0);
2157 if (cmd->pi_err)
fdeab852 2158 return true;
bc005869 2159 }
fdeab852 2160 break;
72c03850
NB		 2161 case TARGET_PROT_DIN_INSERT:
2162 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2163 break;
2164
2165 sbc_dif_generate(cmd);
2166 break;
fdeab852
NB		 2167 default:
2168 break;
bc005869
NB		 2169 }
2170
2171 return false;
2172}
2173
35e0e757 2174static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2175{
35e0e757 2176 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2177 int ret;
35e0e757 2178
c66ac9db
NB		 2179 /*
2180 * Check if we need to move delayed/dormant tasks from cmds on the
2181 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2182 * Attribute.
2183 */
019c4ca6
CH		 2184 transport_complete_task_attr(cmd);
2185
07bde79a
NB		 2186 /*
2187 * Check to schedule QUEUE_FULL work, or execute an existing
2188 * cmd->transport_qf_callback()
2189 */
2190 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2191 schedule_work(&cmd->se_dev->qf_work_queue);
2192
c66ac9db 2193 /*
d5829eac 2194 * Check if we need to send a sense buffer from
c66ac9db
NB		 2195 * the struct se_cmd in question.
2196 */
2197 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2198 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2199 ret = transport_send_check_condition_and_sense(
2200 cmd, 0, 1);
fa7e25cf 2201 if (ret)
27a27099
PB		 2202 goto queue_full;
2203
2204 transport_lun_remove_cmd(cmd);
2205 transport_cmd_check_stop_to_fabric(cmd);
2206 return;
c66ac9db
NB		 2207 }
2208 /*
25985edc 2209 * Check for a callback, used by amongst other things
a6b0133c 2210 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2211 */
a6b0133c
NB		 2212 if (cmd->transport_complete_callback) {
2213 sense_reason_t rc;
057085e5
NB		 2214 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2215 bool zero_dl = !(cmd->data_length);
2216 int post_ret = 0;
a6b0133c 2217
057085e5
NB		 2218 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2219 if (!rc && !post_ret) {
2220 if (caw && zero_dl)
c8e63985
NB		 2221 goto queue_rsp;
2222
a6b0133c 2223 return;
a2890087
NB		 2224 } else if (rc) {
2225 ret = transport_send_check_condition_and_sense(cmd,
2226 rc, 0);
fa7e25cf 2227 if (ret)
a2890087 2228 goto queue_full;
a6b0133c 2229
a2890087
NB		 2230 transport_lun_remove_cmd(cmd);
2231 transport_cmd_check_stop_to_fabric(cmd);
2232 return;
2233 }
a6b0133c 2234 }
c66ac9db 2235
c8e63985 2236queue_rsp:
c66ac9db
NB		 2237 switch (cmd->data_direction) {
2238 case DMA_FROM_DEVICE:
4347ab5a
NB		 2239 if (cmd->scsi_status)
2240 goto queue_status;
2241
4cc987ea
NB		 2242 atomic_long_add(cmd->data_length,
2243 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2244 /*
2245 * Perform READ_STRIP of PI using software emulation when
2246 * backend had PI enabled, if the transport will not be
2247 * performing hardware READ_STRIP offload.
2248 */
fdeab852 2249 if (target_read_prot_action(cmd)) {
bc005869
NB		 2250 ret = transport_send_check_condition_and_sense(cmd,
2251 cmd->pi_err, 0);
fa7e25cf 2252 if (ret)
bc005869
NB		 2253 goto queue_full;
2254
2255 transport_lun_remove_cmd(cmd);
2256 transport_cmd_check_stop_to_fabric(cmd);
2257 return;
2258 }
c66ac9db 2259
e5c0d6ad 2260 trace_target_cmd_complete(cmd);
07bde79a 2261 ret = cmd->se_tfo->queue_data_in(cmd);
fa7e25cf 2262 if (ret)
07bde79a 2263 goto queue_full;
c66ac9db
NB		 2264 break;
2265 case DMA_TO_DEVICE:
4cc987ea
NB		 2266 atomic_long_add(cmd->data_length,
2267 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2268 /*
2269 * Check if we need to send READ payload for BIDI-COMMAND
2270 */
64577407 2271 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2272 atomic_long_add(cmd->data_length,
2273 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2274 ret = cmd->se_tfo->queue_data_in(cmd);
fa7e25cf 2275 if (ret)
07bde79a 2276 goto queue_full;
c66ac9db
NB		 2277 break;
2278 }
d7e595dd 2279 /* fall through */
c66ac9db 2280 case DMA_NONE:
4347ab5a 2281queue_status:
e5c0d6ad 2282 trace_target_cmd_complete(cmd);
07bde79a 2283 ret = cmd->se_tfo->queue_status(cmd);
fa7e25cf 2284 if (ret)
07bde79a 2285 goto queue_full;
c66ac9db
NB		 2286 break;
2287 default:
2288 break;
2289 }
2290
2291 transport_lun_remove_cmd(cmd);
2292 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2293 return;
2294
2295queue_full:
6708bb27 2296 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2297 " data_direction: %d\n", cmd, cmd->data_direction);
fa7e25cf
NB		 2298
2299 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db
NB		 2300}
2301
e64aa657 2302void target_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2303{
ec98f782 2304 struct scatterlist *sg;
ec98f782 2305 int count;
c66ac9db 2306
6708bb27
AG		 2307 for_each_sg(sgl, sg, nents, count)
2308 __free_page(sg_page(sg));
c66ac9db 2309
6708bb27
AG		 2310 kfree(sgl);
2311}
e64aa657 2312EXPORT_SYMBOL(target_free_sgl);
c66ac9db 2313
47e459e6
NB		 2314static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2315{
2316 /*
2317 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2318 * emulation, and free + reset pointers if necessary..
2319 */
2320 if (!cmd->t_data_sg_orig)
2321 return;
2322
2323 kfree(cmd->t_data_sg);
2324 cmd->t_data_sg = cmd->t_data_sg_orig;
2325 cmd->t_data_sg_orig = NULL;
2326 cmd->t_data_nents = cmd->t_data_nents_orig;
2327 cmd->t_data_nents_orig = 0;
2328}
2329
6708bb27
AG		 2330static inline void transport_free_pages(struct se_cmd *cmd)
2331{
5835812f 2332 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
e64aa657 2333 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
5835812f
AM		 2334 cmd->t_prot_sg = NULL;
2335 cmd->t_prot_nents = 0;
2336 }
2337
47e459e6 2338 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2339 /*
2340 * Release special case READ buffer payload required for
2341 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2342 */
2343 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
e64aa657 2344 target_free_sgl(cmd->t_bidi_data_sg,
c8e63985
NB		 2345 cmd->t_bidi_data_nents);
2346 cmd->t_bidi_data_sg = NULL;
2347 cmd->t_bidi_data_nents = 0;
2348 }
47e459e6 2349 transport_reset_sgl_orig(cmd);
6708bb27 2350 return;
47e459e6
NB		 2351 }
2352 transport_reset_sgl_orig(cmd);
6708bb27 2353
e64aa657 2354 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2355 cmd->t_data_sg = NULL;
2356 cmd->t_data_nents = 0;
c66ac9db 2357
e64aa657 2358 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2359 cmd->t_bidi_data_sg = NULL;
2360 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2361}
2362
4949314c 2363void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2364{
ec98f782 2365 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2366 struct page **pages;
2367 int i;
05d1c7c0
AG		 2368
2369 /*
ec98f782
AG		 2370 * We need to take into account a possible offset here for fabrics like
2371 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2372 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2373 */
4949314c
AG		 2374 if (!cmd->t_data_nents)
2375 return NULL;
3717ef0c
PB		 2376
2377 BUG_ON(!sg);
2378 if (cmd->t_data_nents == 1)
4949314c
AG		 2379 return kmap(sg_page(sg)) + sg->offset;
2380
2381 /* >1 page. use vmap */
df6751f3 2382 pages = kmalloc_array(cmd->t_data_nents, sizeof(*pages), GFP_KERNEL);
de103c93 2383 if (!pages)
4949314c
AG		 2384 return NULL;
2385
2386 /* convert sg[] to pages[] */
2387 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2388 pages[i] = sg_page(sg);
2389 }
2390
2391 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2392 kfree(pages);
de103c93 2393 if (!cmd->t_data_vmap)
4949314c
AG		 2394 return NULL;
2395
2396 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2397}
4949314c 2398EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2399
4949314c 2400void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2401{
a1edf9cf 2402 if (!cmd->t_data_nents) {
4949314c 2403 return;
a1edf9cf 2404 } else if (cmd->t_data_nents == 1) {
4949314c 2405 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2406 return;
2407 }
4949314c
AG		 2408
2409 vunmap(cmd->t_data_vmap);
2410 cmd->t_data_vmap = NULL;
05d1c7c0 2411}
4949314c 2412EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2413
c5ff8d6b 2414int
20093994 2415target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
e64aa657 2416 bool zero_page, bool chainable)
c66ac9db 2417{
20093994 2418 struct scatterlist *sg;
ec98f782 2419 struct page *page;
20093994 2420 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
e64aa657 2421 unsigned int nalloc, nent;
ec98f782 2422 int i = 0;
c66ac9db 2423
e64aa657
CH		 2424 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2425 if (chainable)
2426 nalloc++;
2427 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
20093994 2428 if (!sg)
ec98f782 2429 return -ENOMEM;
c66ac9db 2430
e64aa657 2431 sg_init_table(sg, nalloc);
9db9da33 2432
ec98f782
AG		 2433 while (length) {
2434 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2435 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2436 if (!page)
2437 goto out;
c66ac9db 2438
20093994 2439 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2440 length -= page_len;
2441 i++;
c66ac9db 2442 }
20093994
NB		 2443 *sgl = sg;
2444 *nents = nent;
c66ac9db 2445 return 0;
c66ac9db 2446
ec98f782 2447out:
d0e27c88 2448 while (i > 0) {
ec98f782 2449 i--;
20093994 2450 __free_page(sg_page(&sg[i]));
c66ac9db 2451 }
20093994 2452 kfree(sg);
ec98f782 2453 return -ENOMEM;
c66ac9db 2454}
e64aa657 2455EXPORT_SYMBOL(target_alloc_sgl);
c66ac9db 2456
da0f7619 2457/*
b16a35b0
AG		 2458 * Allocate any required resources to execute the command. For writes we
2459 * might not have the payload yet, so notify the fabric via a call to
2460 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2461 */
de103c93
CH		 2462sense_reason_t
2463transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2464{
b1a2ecda 2465 unsigned long flags;
c66ac9db 2466 int ret = 0;
c8e63985 2467 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2468
5835812f
AM		 2469 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2470 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2471 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
e64aa657 2472 cmd->prot_length, true, false);
5835812f
AM		 2473 if (ret < 0)
2474 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2475 }
2476
c66ac9db
NB		 2477 /*
2478 * Determine is the TCM fabric module has already allocated physical
2479 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2480 * beforehand.
c66ac9db 2481 */
ec98f782
AG		 2482 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2483 cmd->data_length) {
20093994 2484
8cefe07b
NB		 2485 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2486 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2487 u32 bidi_length;
2488
2489 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2490 bidi_length = cmd->t_task_nolb *
2491 cmd->se_dev->dev_attrib.block_size;
2492 else
2493 bidi_length = cmd->data_length;
2494
2495 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2496 &cmd->t_bidi_data_nents,
e64aa657 2497 bidi_length, zero_flag, false);
8cefe07b
NB		 2498 if (ret < 0)
2499 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2500 }
2501
20093994 2502 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
e64aa657 2503 cmd->data_length, zero_flag, false);
c66ac9db 2504 if (ret < 0)
de103c93 2505 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2506 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2507 cmd->data_length) {
2508 /*
2509 * Special case for COMPARE_AND_WRITE with fabrics
2510 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2511 */
2512 u32 caw_length = cmd->t_task_nolb *
2513 cmd->se_dev->dev_attrib.block_size;
2514
2515 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2516 &cmd->t_bidi_data_nents,
e64aa657 2517 caw_length, zero_flag, false);
c8e63985
NB		 2518 if (ret < 0)
2519 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2520 }
c66ac9db 2521 /*
c3196f0c
CH		 2522 * If this command is not a write we can execute it right here,
2523 * for write buffers we need to notify the fabric driver first
2524 * and let it call back once the write buffers are ready.
c66ac9db 2525 */
5f41a31d 2526 target_add_to_state_list(cmd);
885e7b0e 2527 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2528 target_execute_cmd(cmd);
2529 return 0;
2530 }
b1a2ecda
BVA		 2531
2532 spin_lock_irqsave(&cmd->t_state_lock, flags);
2533 cmd->t_state = TRANSPORT_WRITE_PENDING;
2534 /*
2535 * Determine if frontend context caller is requesting the stopping of
2536 * this command for frontend exceptions.
2537 */
2538 if (cmd->transport_state & CMD_T_STOP) {
2539 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
2540 __func__, __LINE__, cmd->tag);
2541
2542 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2543
2544 complete_all(&cmd->t_transport_stop_comp);
a5eb307f 2545 return 0;
b1a2ecda
BVA		 2546 }
2547 cmd->transport_state &= ~CMD_T_ACTIVE;
2548 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c3196f0c
CH		 2549
2550 ret = cmd->se_tfo->write_pending(cmd);
fa7e25cf 2551 if (ret)
c3196f0c
CH		 2552 goto queue_full;
2553
fa7e25cf 2554 return 0;
da0f7619 2555
c3196f0c
CH		 2556queue_full:
2557 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
fa7e25cf 2558 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
c3196f0c 2559 return 0;
c66ac9db 2560}
a1d8b49a 2561EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2562
e057f533 2563static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2564{
9574a497 2565 unsigned long flags;
f147abb4 2566 int ret;
9574a497
NB		 2567 bool stop;
2568
2569 spin_lock_irqsave(&cmd->t_state_lock, flags);
2570 stop = (cmd->transport_state & (CMD_T_STOP | CMD_T_ABORTED));
2571 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2572
2573 if (stop) {
2574 pr_debug("%s:%d CMD_T_STOP|CMD_T_ABORTED for ITT: 0x%08llx\n",
2575 __func__, __LINE__, cmd->tag);
2576 complete_all(&cmd->t_transport_stop_comp);
2577 return;
2578 }
f147abb4
NB		 2579
2580 ret = cmd->se_tfo->write_pending(cmd);
fa7e25cf 2581 if (ret) {
e057f533
CH		 2582 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2583 cmd);
fa7e25cf 2584 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
e057f533 2585 }
07bde79a
NB		 2586}
2587
0f4a9431
NB		 2588static bool
2589__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2590 unsigned long *flags);
2591
2592static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2593{
2594 unsigned long flags;
2595
2596 spin_lock_irqsave(&cmd->t_state_lock, flags);
2597 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2598 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2599}
2600
d5ddad41 2601int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2602{
d5ddad41 2603 int ret = 0;
0f4a9431 2604 bool aborted = false, tas = false;
d5ddad41 2605
d14921d6 2606 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2607 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
0f4a9431 2608 target_wait_free_cmd(cmd, &aborted, &tas);
d14921d6 2609
0f4a9431 2610 if (!aborted || tas)
c0170698 2611 ret = target_put_sess_cmd(cmd);
d14921d6
NB		 2612 } else {
2613 if (wait_for_tasks)
0f4a9431 2614 target_wait_free_cmd(cmd, &aborted, &tas);
c130480b
NB		 2615 /*
2616 * Handle WRITE failure case where transport_generic_new_cmd()
2617 * has already added se_cmd to state_list, but fabric has
2618 * failed command before I/O submission.
2619 */
febe562c 2620 if (cmd->state_active)
c130480b 2621 target_remove_from_state_list(cmd);
d14921d6 2622
82f1c8a4 2623 if (cmd->se_lun)
c66ac9db 2624 transport_lun_remove_cmd(cmd);
c66ac9db 2625
0f4a9431 2626 if (!aborted || tas)
c0170698 2627 ret = target_put_sess_cmd(cmd);
0f4a9431
NB		 2628 }
2629 /*
2630 * If the task has been internally aborted due to TMR ABORT_TASK
2631 * or LUN_RESET, target_core_tmr.c is responsible for performing
2632 * the remaining calls to target_put_sess_cmd(), and not the
2633 * callers of this function.
2634 */
2635 if (aborted) {
2636 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2637 wait_for_completion(&cmd->cmd_wait_comp);
2638 cmd->se_tfo->release_cmd(cmd);
2639 ret = 1;
c66ac9db 2640 }
d5ddad41 2641 return ret;
c66ac9db
NB		 2642}
2643EXPORT_SYMBOL(transport_generic_free_cmd);
2644
a17f091d 2645/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2646 * @se_cmd: command descriptor to add
a6360785 2647 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2648 */
afc16604 2649int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2650{
afc16604 2651 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2652 unsigned long flags;
bc187ea6 2653 int ret = 0;
a17f091d 2654
a6360785
NB		 2655 /*
2656 * Add a second kref if the fabric caller is expecting to handle
2657 * fabric acknowledgement that requires two target_put_sess_cmd()
2658 * invocations before se_cmd descriptor release.
2659 */
527268df 2660 if (ack_kref) {
1b4c59b7
HR		 2661 if (!kref_get_unless_zero(&se_cmd->cmd_kref))
2662 return -EINVAL;
2663
527268df
NB		 2664 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2665 }
7481deb4 2666
a17f091d 2667 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2668 if (se_sess->sess_tearing_down) {
2669 ret = -ESHUTDOWN;
2670 goto out;
2671 }
1c21a480 2672 se_cmd->transport_state |= CMD_T_PRE_EXECUTE;
a17f091d 2673 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2674out:
a17f091d 2675 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2676
2677 if (ret && ack_kref)
afc16604 2678 target_put_sess_cmd(se_cmd);
7544e597 2679
bc187ea6 2680 return ret;
a17f091d 2681}
20361e69 2682EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2683
febe562c
NB		 2684static void target_free_cmd_mem(struct se_cmd *cmd)
2685{
2686 transport_free_pages(cmd);
2687
2688 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2689 core_tmr_release_req(cmd->se_tmr_req);
2690 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2691 kfree(cmd->t_task_cdb);
2692}
2693
7481deb4 2694static void target_release_cmd_kref(struct kref *kref)
a17f091d 2695{
7481deb4
NB		 2696 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2697 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2698 unsigned long flags;
0f4a9431 2699 bool fabric_stop;
a17f091d 2700
6b6427b6
BVA		 2701 if (se_sess) {
2702 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2703
2704 spin_lock(&se_cmd->t_state_lock);
2705 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2706 (se_cmd->transport_state & CMD_T_ABORTED);
2707 spin_unlock(&se_cmd->t_state_lock);
2708
2709 if (se_cmd->cmd_wait_set || fabric_stop) {
2710 list_del_init(&se_cmd->se_cmd_list);
2711 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2712 target_free_cmd_mem(se_cmd);
2713 complete(&se_cmd->cmd_wait_comp);
2714 return;
2715 }
0f4a9431 2716 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2717 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2718 }
a17f091d 2719
febe562c 2720 target_free_cmd_mem(se_cmd);
7481deb4
NB		 2721 se_cmd->se_tfo->release_cmd(se_cmd);
2722}
2723
6b6427b6
BVA		 2724/**
2725 * target_put_sess_cmd - decrease the command reference count
2726 * @se_cmd: command to drop a reference from
2727 *
2728 * Returns 1 if and only if this target_put_sess_cmd() call caused the
2729 * refcount to drop to zero. Returns zero otherwise.
7481deb4 2730 */
afc16604 2731int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2732{
9ff9d15e 2733 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2734}
2735EXPORT_SYMBOL(target_put_sess_cmd);
2736
c00e6220
BVA		 2737static const char *data_dir_name(enum dma_data_direction d)
2738{
2739 switch (d) {
2740 case DMA_BIDIRECTIONAL: return "BIDI";
2741 case DMA_TO_DEVICE: return "WRITE";
2742 case DMA_FROM_DEVICE: return "READ";
2743 case DMA_NONE: return "NONE";
2744 }
2745
2746 return "(?)";
2747}
2748
2749static const char *cmd_state_name(enum transport_state_table t)
2750{
2751 switch (t) {
2752 case TRANSPORT_NO_STATE: return "NO_STATE";
2753 case TRANSPORT_NEW_CMD: return "NEW_CMD";
2754 case TRANSPORT_WRITE_PENDING: return "WRITE_PENDING";
2755 case TRANSPORT_PROCESSING: return "PROCESSING";
2756 case TRANSPORT_COMPLETE: return "COMPLETE";
2757 case TRANSPORT_ISTATE_PROCESSING:
2758 return "ISTATE_PROCESSING";
2759 case TRANSPORT_COMPLETE_QF_WP: return "COMPLETE_QF_WP";
2760 case TRANSPORT_COMPLETE_QF_OK: return "COMPLETE_QF_OK";
2761 case TRANSPORT_COMPLETE_QF_ERR: return "COMPLETE_QF_ERR";
2762 }
2763
2764 return "(?)";
2765}
2766
2767static void target_append_str(char **str, const char *txt)
2768{
2769 char *prev = *str;
2770
2771 *str = *str ? kasprintf(GFP_ATOMIC, "%s,%s", *str, txt) :
2772 kstrdup(txt, GFP_ATOMIC);
2773 kfree(prev);
2774}
2775
2776/*
2777 * Convert a transport state bitmask into a string. The caller is
2778 * responsible for freeing the returned pointer.
2779 */
2780static char *target_ts_to_str(u32 ts)
2781{
2782 char *str = NULL;
2783
2784 if (ts & CMD_T_ABORTED)
2785 target_append_str(&str, "aborted");
2786 if (ts & CMD_T_ACTIVE)
2787 target_append_str(&str, "active");
2788 if (ts & CMD_T_COMPLETE)
2789 target_append_str(&str, "complete");
2790 if (ts & CMD_T_SENT)
2791 target_append_str(&str, "sent");
2792 if (ts & CMD_T_STOP)
2793 target_append_str(&str, "stop");
2794 if (ts & CMD_T_FABRIC_STOP)
2795 target_append_str(&str, "fabric_stop");
2796
2797 return str;
2798}
2799
2800static const char *target_tmf_name(enum tcm_tmreq_table tmf)
2801{
2802 switch (tmf) {
2803 case TMR_ABORT_TASK: return "ABORT_TASK";
2804 case TMR_ABORT_TASK_SET: return "ABORT_TASK_SET";
2805 case TMR_CLEAR_ACA: return "CLEAR_ACA";
2806 case TMR_CLEAR_TASK_SET: return "CLEAR_TASK_SET";
2807 case TMR_LUN_RESET: return "LUN_RESET";
2808 case TMR_TARGET_WARM_RESET: return "TARGET_WARM_RESET";
2809 case TMR_TARGET_COLD_RESET: return "TARGET_COLD_RESET";
2810 case TMR_UNKNOWN: break;
2811 }
2812 return "(?)";
2813}
2814
2815void target_show_cmd(const char *pfx, struct se_cmd *cmd)
2816{
2817 char *ts_str = target_ts_to_str(cmd->transport_state);
2818 const u8 *cdb = cmd->t_task_cdb;
2819 struct se_tmr_req *tmf = cmd->se_tmr_req;
2820
2821 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2822 pr_debug("%scmd %#02x:%#02x with tag %#llx dir %s i_state %d t_state %s len %d refcnt %d transport_state %s\n",
2823 pfx, cdb[0], cdb[1], cmd->tag,
2824 data_dir_name(cmd->data_direction),
2825 cmd->se_tfo->get_cmd_state(cmd),
2826 cmd_state_name(cmd->t_state), cmd->data_length,
2827 kref_read(&cmd->cmd_kref), ts_str);
2828 } else {
2829 pr_debug("%stmf %s with tag %#llx ref_task_tag %#llx i_state %d t_state %s refcnt %d transport_state %s\n",
2830 pfx, target_tmf_name(tmf->function), cmd->tag,
2831 tmf->ref_task_tag, cmd->se_tfo->get_cmd_state(cmd),
2832 cmd_state_name(cmd->t_state),
2833 kref_read(&cmd->cmd_kref), ts_str);
2834 }
2835 kfree(ts_str);
2836}
2837EXPORT_SYMBOL(target_show_cmd);
2838
1c7b13fe
RD		 2839/* target_sess_cmd_list_set_waiting - Flag all commands in
2840 * sess_cmd_list to complete cmd_wait_comp. Set
2841 * sess_tearing_down so no more commands are queued.
2842 * @se_sess: session to flag
a17f091d 2843 */
1c7b13fe 2844void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d 2845{
1b4c59b7 2846 struct se_cmd *se_cmd, *tmp_cmd;
a17f091d 2847 unsigned long flags;
0f4a9431 2848 int rc;
a17f091d 2849
a17f091d 2850 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2851 if (se_sess->sess_tearing_down) {
2852 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2853 return;
2854 }
1c7b13fe 2855 se_sess->sess_tearing_down = 1;
9b31a328 2856 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2857
1b4c59b7
HR		 2858 list_for_each_entry_safe(se_cmd, tmp_cmd,
2859 &se_sess->sess_wait_list, se_cmd_list) {
0f4a9431
NB		 2860 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2861 if (rc) {
2862 se_cmd->cmd_wait_set = 1;
2863 spin_lock(&se_cmd->t_state_lock);
2864 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2865 spin_unlock(&se_cmd->t_state_lock);
1b4c59b7
HR		 2866 } else
2867 list_del_init(&se_cmd->se_cmd_list);
0f4a9431 2868 }
a17f091d
NB		 2869
2870 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2871}
1c7b13fe 2872EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2873
2874/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2875 * @se_sess: session to wait for active I/O
a17f091d 2876 */
be646c2d 2877void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2878{
2879 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2880 unsigned long flags;
0f4a9431 2881 bool tas;
a17f091d
NB		 2882
2883 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2884 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2885 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2886 " %d\n", se_cmd, se_cmd->t_state,
2887 se_cmd->se_tfo->get_cmd_state(se_cmd));
2888
0f4a9431
NB		 2889 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2890 tas = (se_cmd->transport_state & CMD_T_TAS);
2891 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2892
2893 if (!target_put_sess_cmd(se_cmd)) {
2894 if (tas)
2895 target_put_sess_cmd(se_cmd);
2896 }
2897
be646c2d
JE		 2898 wait_for_completion(&se_cmd->cmd_wait_comp);
2899 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2900 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2901 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2902
2903 se_cmd->se_tfo->release_cmd(se_cmd);
2904 }
9b31a328
NB		 2905
2906 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2907 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2908 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2909
a17f091d
NB		 2910}
2911EXPORT_SYMBOL(target_wait_for_sess_cmds);
2912
bd4e2d29
NB		 2913static void target_lun_confirm(struct percpu_ref *ref)
2914{
2915 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
2916
2917 complete(&lun->lun_ref_comp);
2918}
2919
b3eeea66 2920void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2921{
bd4e2d29
NB		 2922 /*
2923 * Mark the percpu-ref as DEAD, switch to atomic_t mode, drop
2924 * the initial reference and schedule confirm kill to be
2925 * executed after one full RCU grace period has completed.
2926 */
2927 percpu_ref_kill_and_confirm(&lun->lun_ref, target_lun_confirm);
2928 /*
2929 * The first completion waits for percpu_ref_switch_to_atomic_rcu()
2930 * to call target_lun_confirm after lun->lun_ref has been marked
2931 * as __PERCPU_REF_DEAD on all CPUs, and switches to atomic_t
2932 * mode so that percpu_ref_tryget_live() lookup of lun->lun_ref
2933 * fails for all new incoming I/O.
2934 */
5277797d 2935 wait_for_completion(&lun->lun_ref_comp);
bd4e2d29
NB		 2936 /*
2937 * The second completion waits for percpu_ref_put_many() to
2938 * invoke ->release() after lun->lun_ref has switched to
2939 * atomic_t mode, and lun->lun_ref.count has reached zero.
2940 *
2941 * At this point all target-core lun->lun_ref references have
2942 * been dropped via transport_lun_remove_cmd(), and it's safe
2943 * to proceed with the remaining LUN shutdown.
2944 */
2945 wait_for_completion(&lun->lun_shutdown_comp);
c66ac9db
NB		 2946}
2947
0f4a9431
NB		 2948static bool
2949__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2950 bool *aborted, bool *tas, unsigned long *flags)
2951 __releases(&cmd->t_state_lock)
2952 __acquires(&cmd->t_state_lock)
c66ac9db 2953{
c66ac9db 2954
0f4a9431
NB		 2955 assert_spin_locked(&cmd->t_state_lock);
2956 WARN_ON_ONCE(!irqs_disabled());
2957
2958 if (fabric_stop)
2959 cmd->transport_state |= CMD_T_FABRIC_STOP;
2960
2961 if (cmd->transport_state & CMD_T_ABORTED)
2962 *aborted = true;
2963
2964 if (cmd->transport_state & CMD_T_TAS)
2965 *tas = true;
2966
c8e31f26 2967 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
0f4a9431 2968 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2969 return false;
cb4f4d3c 2970
c8e31f26 2971 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
0f4a9431 2972 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2973 return false;
7d680f3b 2974
0f4a9431
NB		 2975 if (!(cmd->transport_state & CMD_T_ACTIVE))
2976 return false;
2977
2978 if (fabric_stop && *aborted)
a17f091d 2979 return false;
c66ac9db 2980
7d680f3b 2981 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2982
c00e6220 2983 target_show_cmd("wait_for_tasks: Stopping ", cmd);
c66ac9db 2984
0f4a9431 2985 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db 2986
c00e6220
BVA		 2987 while (!wait_for_completion_timeout(&cmd->t_transport_stop_comp,
2988 180 * HZ))
2989 target_show_cmd("wait for tasks: ", cmd);
c66ac9db 2990
0f4a9431 2991 spin_lock_irqsave(&cmd->t_state_lock, *flags);
7d680f3b 2992 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2993
0f4a9431
NB		 2994 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2995 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
c66ac9db 2996
0f4a9431
NB		 2997 return true;
2998}
2999
3000/**
2d4760ee
BVA		 3001 * transport_wait_for_tasks - set CMD_T_STOP and wait for t_transport_stop_comp
3002 * @cmd: command to wait on
0f4a9431
NB		 3003 */
3004bool transport_wait_for_tasks(struct se_cmd *cmd)
3005{
3006 unsigned long flags;
3007 bool ret, aborted = false, tas = false;
3008
3009 spin_lock_irqsave(&cmd->t_state_lock, flags);
3010 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
d14921d6 3011 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 3012
0f4a9431 3013 return ret;
c66ac9db 3014}
d14921d6 3015EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 3016
ab78fef4
BVA		 3017struct sense_info {
3018 u8 key;
3019 u8 asc;
3020 u8 ascq;
3021 bool add_sector_info;
3022};
3023
3024static const struct sense_info sense_info_table[] = {
3025 [TCM_NO_SENSE] = {
3026 .key = NOT_READY
3027 },
3028 [TCM_NON_EXISTENT_LUN] = {
3029 .key = ILLEGAL_REQUEST,
3030 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
3031 },
3032 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
3033 .key = ILLEGAL_REQUEST,
3034 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
3035 },
3036 [TCM_SECTOR_COUNT_TOO_MANY] = {
3037 .key = ILLEGAL_REQUEST,
3038 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
3039 },
3040 [TCM_UNKNOWN_MODE_PAGE] = {
3041 .key = ILLEGAL_REQUEST,
3042 .asc = 0x24, /* INVALID FIELD IN CDB */
3043 },
3044 [TCM_CHECK_CONDITION_ABORT_CMD] = {
3045 .key = ABORTED_COMMAND,
3046 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
3047 .ascq = 0x03,
3048 },
3049 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
3050 .key = ABORTED_COMMAND,
3051 .asc = 0x0c, /* WRITE ERROR */
3052 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
3053 },
3054 [TCM_INVALID_CDB_FIELD] = {
3055 .key = ILLEGAL_REQUEST,
3056 .asc = 0x24, /* INVALID FIELD IN CDB */
3057 },
3058 [TCM_INVALID_PARAMETER_LIST] = {
3059 .key = ILLEGAL_REQUEST,
3060 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
3061 },
e8642120
DD		 3062 [TCM_TOO_MANY_TARGET_DESCS] = {
3063 .key = ILLEGAL_REQUEST,
3064 .asc = 0x26,
3065 .ascq = 0x06, /* TOO MANY TARGET DESCRIPTORS */
3066 },
3067 [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = {
3068 .key = ILLEGAL_REQUEST,
3069 .asc = 0x26,
3070 .ascq = 0x07, /* UNSUPPORTED TARGET DESCRIPTOR TYPE CODE */
3071 },
3072 [TCM_TOO_MANY_SEGMENT_DESCS] = {
3073 .key = ILLEGAL_REQUEST,
3074 .asc = 0x26,
3075 .ascq = 0x08, /* TOO MANY SEGMENT DESCRIPTORS */
3076 },
3077 [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = {
3078 .key = ILLEGAL_REQUEST,
3079 .asc = 0x26,
3080 .ascq = 0x09, /* UNSUPPORTED SEGMENT DESCRIPTOR TYPE CODE */
3081 },
ab78fef4
BVA		 3082 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
3083 .key = ILLEGAL_REQUEST,
3084 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
3085 },
3086 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
3087 .key = ILLEGAL_REQUEST,
3088 .asc = 0x0c, /* WRITE ERROR */
3089 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
3090 },
3091 [TCM_SERVICE_CRC_ERROR] = {
3092 .key = ABORTED_COMMAND,
3093 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
3094 .ascq = 0x05, /* N/A */
3095 },
3096 [TCM_SNACK_REJECTED] = {
3097 .key = ABORTED_COMMAND,
3098 .asc = 0x11, /* READ ERROR */
3099 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
3100 },
3101 [TCM_WRITE_PROTECTED] = {
3102 .key = DATA_PROTECT,
3103 .asc = 0x27, /* WRITE PROTECTED */
3104 },
3105 [TCM_ADDRESS_OUT_OF_RANGE] = {
3106 .key = ILLEGAL_REQUEST,
3107 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
3108 },
3109 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
3110 .key = UNIT_ATTENTION,
3111 },
3112 [TCM_CHECK_CONDITION_NOT_READY] = {
3113 .key = NOT_READY,
3114 },
3115 [TCM_MISCOMPARE_VERIFY] = {
3116 .key = MISCOMPARE,
3117 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
3118 .ascq = 0x00,
3119 },
3120 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 3121 .key = ABORTED_COMMAND,
ab78fef4
BVA		 3122 .asc = 0x10,
3123 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
3124 .add_sector_info = true,
3125 },
3126 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 3127 .key = ABORTED_COMMAND,
ab78fef4
BVA		 3128 .asc = 0x10,
3129 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
3130 .add_sector_info = true,
3131 },
3132 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 3133 .key = ABORTED_COMMAND,
ab78fef4
BVA		 3134 .asc = 0x10,
3135 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
3136 .add_sector_info = true,
3137 },
449a1378
NB		 3138 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = {
3139 .key = COPY_ABORTED,
3140 .asc = 0x0d,
3141 .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */
3142
3143 },
ab78fef4
BVA		 3144 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
3145 /*
3146 * Returning ILLEGAL REQUEST would cause immediate IO errors on
3147 * Solaris initiators. Returning NOT READY instead means the
3148 * operations will be retried a finite number of times and we
3149 * can survive intermittent errors.
3150 */
3151 .key = NOT_READY,
3152 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
3153 },
79dd6f2f 3154 [TCM_INSUFFICIENT_REGISTRATION_RESOURCES] = {
3155 /*
3156 * From spc4r22 section5.7.7,5.7.8
3157 * If a PERSISTENT RESERVE OUT command with a REGISTER service action
3158 * or a REGISTER AND IGNORE EXISTING KEY service action or
3159 * REGISTER AND MOVE service actionis attempted,
3160 * but there are insufficient device server resources to complete the
3161 * operation, then the command shall be terminated with CHECK CONDITION
3162 * status, with the sense key set to ILLEGAL REQUEST,and the additonal
3163 * sense code set to INSUFFICIENT REGISTRATION RESOURCES.
3164 */
3165 .key = ILLEGAL_REQUEST,
3166 .asc = 0x55,
3167 .ascq = 0x04, /* INSUFFICIENT REGISTRATION RESOURCES */
3168 },
ab78fef4
BVA		 3169};
3170
f5a8b3a7 3171static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 3172{
3173 const struct sense_info *si;
3174 u8 *buffer = cmd->sense_buffer;
3175 int r = (__force int)reason;
3176 u8 asc, ascq;
4e4937e8 3177 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 3178
3179 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
3180 si = &sense_info_table[r];
3181 else
3182 si = &sense_info_table[(__force int)
3183 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
3184
ab78fef4
BVA		 3185 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
3186 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3187 WARN_ON_ONCE(asc == 0);
3188 } else if (si->asc == 0) {
3189 WARN_ON_ONCE(cmd->scsi_asc == 0);
3190 asc = cmd->scsi_asc;
3191 ascq = cmd->scsi_ascq;
3192 } else {
3193 asc = si->asc;
3194 ascq = si->ascq;
3195 }
9ec1e1ce 3196
4e4937e8 3197 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 3198 if (si->add_sector_info)
f5a8b3a7
SG		 3199 return scsi_set_sense_information(buffer,
3200 cmd->scsi_sense_length,
3201 cmd->bad_sector);
3202
3203 return 0;
ab78fef4
BVA		 3204}
3205
de103c93
CH		 3206int
3207transport_send_check_condition_and_sense(struct se_cmd *cmd,
3208 sense_reason_t reason, int from_transport)
c66ac9db 3209{
c66ac9db 3210 unsigned long flags;
c66ac9db 3211
a1d8b49a 3212 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3213 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 3214 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3215 return 0;
3216 }
3217 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 3218 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3219
ab78fef4 3220 if (!from_transport) {
f5a8b3a7
SG		 3221 int rc;
3222
c66ac9db 3223 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 3224 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3225 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 3226 rc = translate_sense_reason(cmd, reason);
3227 if (rc)
3228 return rc;
c66ac9db 3229 }
c66ac9db 3230
e5c0d6ad 3231 trace_target_cmd_complete(cmd);
07bde79a 3232 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3233}
3234EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3235
310d3d31
NB		 3236static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3237 __releases(&cmd->t_state_lock)
3238 __acquires(&cmd->t_state_lock)
c66ac9db 3239{
fa7e25cf
NB		 3240 int ret;
3241
310d3d31
NB		 3242 assert_spin_locked(&cmd->t_state_lock);
3243 WARN_ON_ONCE(!irqs_disabled());
3244
c18bc7d8
RD		 3245 if (!(cmd->transport_state & CMD_T_ABORTED))
3246 return 0;
68259b5a
AL		 3247 /*
3248 * If cmd has been aborted but either no status is to be sent or it has
3249 * already been sent, just return
3250 */
310d3d31
NB		 3251 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
3252 if (send_status)
3253 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c18bc7d8 3254 return 1;
310d3d31 3255 }
8b1e1244 3256
310d3d31
NB		 3257 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
3258 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3259
68259b5a 3260 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 3261 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 3262 trace_target_cmd_complete(cmd);
310d3d31
NB		 3263
3264 spin_unlock_irq(&cmd->t_state_lock);
fa7e25cf
NB		 3265 ret = cmd->se_tfo->queue_status(cmd);
3266 if (ret)
3267 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
310d3d31 3268 spin_lock_irq(&cmd->t_state_lock);
c18bc7d8
RD		 3269
3270 return 1;
c66ac9db 3271}
310d3d31
NB		 3272
3273int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3274{
3275 int ret;
3276
3277 spin_lock_irq(&cmd->t_state_lock);
3278 ret = __transport_check_aborted_status(cmd, send_status);
3279 spin_unlock_irq(&cmd->t_state_lock);
3280
3281 return ret;
3282}
c66ac9db
NB		 3283EXPORT_SYMBOL(transport_check_aborted_status);
3284
3285void transport_send_task_abort(struct se_cmd *cmd)
3286{
c252f003 3287 unsigned long flags;
fa7e25cf 3288 int ret;
c252f003
NB		 3289
3290 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 3291 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 3292 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3293 return;
3294 }
3295 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3296
c66ac9db
NB		 3297 /*
3298 * If there are still expected incoming fabric WRITEs, we wait
3299 * until until they have completed before sending a TASK_ABORTED
3300 * response. This response with TASK_ABORTED status will be
3301 * queued back to fabric module by transport_check_aborted_status().
3302 */
3303 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3304 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
310d3d31
NB		 3305 spin_lock_irqsave(&cmd->t_state_lock, flags);
3306 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
3307 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3308 goto send_abort;
3309 }
68259b5a 3310 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
310d3d31 3311 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
29f4c090 3312 return;
c66ac9db
NB		 3313 }
3314 }
310d3d31 3315send_abort:
c66ac9db 3316 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3317
72b59d6e
RD		 3318 transport_lun_remove_cmd(cmd);
3319
649ee054
BVA		 3320 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3321 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3322
e5c0d6ad 3323 trace_target_cmd_complete(cmd);
fa7e25cf
NB		 3324 ret = cmd->se_tfo->queue_status(cmd);
3325 if (ret)
3326 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db
NB		 3327}
3328
af877292 3329static void target_tmr_work(struct work_struct *work)
c66ac9db 3330{
af877292 3331 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3332 struct se_device *dev = cmd->se_dev;
c66ac9db 3333 struct se_tmr_req *tmr = cmd->se_tmr_req;
a6d9bb1c 3334 unsigned long flags;
c66ac9db
NB		 3335 int ret;
3336
a6d9bb1c
NB		 3337 spin_lock_irqsave(&cmd->t_state_lock, flags);
3338 if (cmd->transport_state & CMD_T_ABORTED) {
3339 tmr->response = TMR_FUNCTION_REJECTED;
3340 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3341 goto check_stop;
3342 }
3343 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3344
c66ac9db 3345 switch (tmr->function) {
5c6cd613 3346 case TMR_ABORT_TASK:
3d28934a 3347 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3348 break;
5c6cd613
NB		 3349 case TMR_ABORT_TASK_SET:
3350 case TMR_CLEAR_ACA:
3351 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3352 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3353 break;
5c6cd613 3354 case TMR_LUN_RESET:
c66ac9db
NB		 3355 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3356 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3357 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 3358 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3359 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3360 cmd->orig_fe_lun, 0x29,
3361 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3362 }
c66ac9db 3363 break;
5c6cd613 3364 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3365 tmr->response = TMR_FUNCTION_REJECTED;
3366 break;
5c6cd613 3367 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3368 tmr->response = TMR_FUNCTION_REJECTED;
3369 break;
c66ac9db 3370 default:
6708bb27 3371 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3372 tmr->function);
3373 tmr->response = TMR_FUNCTION_REJECTED;
3374 break;
3375 }
3376
a6d9bb1c
NB		 3377 spin_lock_irqsave(&cmd->t_state_lock, flags);
3378 if (cmd->transport_state & CMD_T_ABORTED) {
3379 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3380 goto check_stop;
3381 }
a6d9bb1c
NB		 3382 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3383
e3d6f909 3384 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3385
a6d9bb1c 3386check_stop:
eeb64d23 3387 transport_lun_remove_cmd(cmd);
b7b8bef7 3388 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3389}
3390
af877292
CH		 3391int transport_generic_handle_tmr(
3392 struct se_cmd *cmd)
c66ac9db 3393{
f15e9cd9 3394 unsigned long flags;
c54eeffb 3395 bool aborted = false;
f15e9cd9
NB		 3396
3397 spin_lock_irqsave(&cmd->t_state_lock, flags);
c54eeffb
NB		 3398 if (cmd->transport_state & CMD_T_ABORTED) {
3399 aborted = true;
3400 } else {
3401 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3402 cmd->transport_state |= CMD_T_ACTIVE;
3403 }
f15e9cd9
NB		 3404 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3405
c54eeffb
NB		 3406 if (aborted) {
3407 pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
3408 "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
3409 cmd->se_tmr_req->ref_task_tag, cmd->tag);
eeb64d23 3410 transport_lun_remove_cmd(cmd);
c54eeffb
NB		 3411 transport_cmd_check_stop_to_fabric(cmd);
3412 return 0;
3413 }
3414
af877292
CH		 3415 INIT_WORK(&cmd->work, target_tmr_work);
3416 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3417 return 0;
3418}
af877292 3419EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3420
3421bool
3422target_check_wce(struct se_device *dev)
3423{
3424 bool wce = false;
3425
3426 if (dev->transport->get_write_cache)
3427 wce = dev->transport->get_write_cache(dev);
3428 else if (dev->dev_attrib.emulate_write_cache > 0)
3429 wce = true;
3430
3431 return wce;
3432}
3433
3434bool
3435target_check_fua(struct se_device *dev)
3436{
3437 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3438}
ubuntu-bionic-kernel mirror