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PM / AVS: rockchip-io: add io selectors and supplies for rk3399
[linux-2.6-block.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
5538d294 37#include <linux/vmalloc.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
ba929992 41#include <scsi/scsi_proto.h>
9ec1e1ce 42#include <scsi/scsi_common.h>
c66ac9db
NB		 43
44#include <target/target_core_base.h>
c4795fb2
CH		 45#include <target/target_core_backend.h>
46#include <target/target_core_fabric.h>
c66ac9db 47
e26d99ae 48#include "target_core_internal.h"
c66ac9db 49#include "target_core_alua.h"
c66ac9db 50#include "target_core_pr.h"
c66ac9db
NB		 51#include "target_core_ua.h"
52
e5c0d6ad
RD		 53#define CREATE_TRACE_POINTS
54#include <trace/events/target.h>
55
35e0e757 56static struct workqueue_struct *target_completion_wq;
c66ac9db 57static struct kmem_cache *se_sess_cache;
c66ac9db 58struct kmem_cache *se_ua_cache;
c66ac9db
NB		 59struct kmem_cache *t10_pr_reg_cache;
60struct kmem_cache *t10_alua_lu_gp_cache;
61struct kmem_cache *t10_alua_lu_gp_mem_cache;
62struct kmem_cache *t10_alua_tg_pt_gp_cache;
229d4f11
HR		 63struct kmem_cache *t10_alua_lba_map_cache;
64struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 65
c66ac9db 66static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 67static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 68 struct se_device *dev);
d5ddad41 69static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 70static void target_complete_ok_work(struct work_struct *work);
c66ac9db 71
e3d6f909 72int init_se_kmem_caches(void)
c66ac9db 73{
c66ac9db
NB		 74 se_sess_cache = kmem_cache_create("se_sess_cache",
75 sizeof(struct se_session), __alignof__(struct se_session),
76 0, NULL);
6708bb27
AG		 77 if (!se_sess_cache) {
78 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 79 " failed\n");
c8e31f26 80 goto out;
c66ac9db
NB		 81 }
82 se_ua_cache = kmem_cache_create("se_ua_cache",
83 sizeof(struct se_ua), __alignof__(struct se_ua),
84 0, NULL);
6708bb27
AG		 85 if (!se_ua_cache) {
86 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 87 goto out_free_sess_cache;
c66ac9db 88 }
c66ac9db
NB		 89 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
90 sizeof(struct t10_pr_registration),
91 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 92 if (!t10_pr_reg_cache) {
93 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 94 " failed\n");
35e0e757 95 goto out_free_ua_cache;
c66ac9db
NB		 96 }
97 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
98 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
99 0, NULL);
6708bb27
AG		 100 if (!t10_alua_lu_gp_cache) {
101 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 102 " failed\n");
35e0e757 103 goto out_free_pr_reg_cache;
c66ac9db
NB		 104 }
105 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
106 sizeof(struct t10_alua_lu_gp_member),
107 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 108 if (!t10_alua_lu_gp_mem_cache) {
109 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 110 "cache failed\n");
35e0e757 111 goto out_free_lu_gp_cache;
c66ac9db
NB		 112 }
113 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
114 sizeof(struct t10_alua_tg_pt_gp),
115 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 116 if (!t10_alua_tg_pt_gp_cache) {
117 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 118 "cache failed\n");
35e0e757 119 goto out_free_lu_gp_mem_cache;
c66ac9db 120 }
229d4f11
HR		 121 t10_alua_lba_map_cache = kmem_cache_create(
122 "t10_alua_lba_map_cache",
123 sizeof(struct t10_alua_lba_map),
124 __alignof__(struct t10_alua_lba_map), 0, NULL);
125 if (!t10_alua_lba_map_cache) {
126 pr_err("kmem_cache_create() for t10_alua_lba_map_"
127 "cache failed\n");
adf653f9 128 goto out_free_tg_pt_gp_cache;
229d4f11
HR		 129 }
130 t10_alua_lba_map_mem_cache = kmem_cache_create(
131 "t10_alua_lba_map_mem_cache",
132 sizeof(struct t10_alua_lba_map_member),
133 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
134 if (!t10_alua_lba_map_mem_cache) {
135 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
136 "cache failed\n");
137 goto out_free_lba_map_cache;
138 }
c66ac9db 139
35e0e757
CH		 140 target_completion_wq = alloc_workqueue("target_completion",
141 WQ_MEM_RECLAIM, 0);
142 if (!target_completion_wq)
229d4f11 143 goto out_free_lba_map_mem_cache;
35e0e757 144
c66ac9db 145 return 0;
35e0e757 146
229d4f11
HR		 147out_free_lba_map_mem_cache:
148 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
149out_free_lba_map_cache:
150 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 151out_free_tg_pt_gp_cache:
152 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
153out_free_lu_gp_mem_cache:
154 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
155out_free_lu_gp_cache:
156 kmem_cache_destroy(t10_alua_lu_gp_cache);
157out_free_pr_reg_cache:
158 kmem_cache_destroy(t10_pr_reg_cache);
159out_free_ua_cache:
160 kmem_cache_destroy(se_ua_cache);
161out_free_sess_cache:
162 kmem_cache_destroy(se_sess_cache);
c66ac9db 163out:
e3d6f909 164 return -ENOMEM;
c66ac9db
NB		 165}
166
e3d6f909 167void release_se_kmem_caches(void)
c66ac9db 168{
35e0e757 169 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 170 kmem_cache_destroy(se_sess_cache);
171 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 172 kmem_cache_destroy(t10_pr_reg_cache);
173 kmem_cache_destroy(t10_alua_lu_gp_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
229d4f11
HR		 176 kmem_cache_destroy(t10_alua_lba_map_cache);
177 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 178}
179
e3d6f909
AG		 180/* This code ensures unique mib indexes are handed out. */
181static DEFINE_SPINLOCK(scsi_mib_index_lock);
182static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 183
184/*
185 * Allocate a new row index for the entry type specified
186 */
187u32 scsi_get_new_index(scsi_index_t type)
188{
189 u32 new_index;
190
e3d6f909 191 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 192
e3d6f909
AG		 193 spin_lock(&scsi_mib_index_lock);
194 new_index = ++scsi_mib_index[type];
195 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 196
197 return new_index;
198}
199
dbc5623e 200void transport_subsystem_check_init(void)
c66ac9db
NB		 201{
202 int ret;
283669d2 203 static int sub_api_initialized;
c66ac9db 204
dbc5623e
NB		 205 if (sub_api_initialized)
206 return;
207
c66ac9db
NB		 208 ret = request_module("target_core_iblock");
209 if (ret != 0)
6708bb27 210 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 211
212 ret = request_module("target_core_file");
213 if (ret != 0)
6708bb27 214 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 215
216 ret = request_module("target_core_pscsi");
217 if (ret != 0)
6708bb27 218 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 219
7c9e7a6f
AG		 220 ret = request_module("target_core_user");
221 if (ret != 0)
222 pr_err("Unable to load target_core_user\n");
223
e3d6f909 224 sub_api_initialized = 1;
c66ac9db
NB		 225}
226
e70beee7 227struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
c66ac9db
NB		 228{
229 struct se_session *se_sess;
230
231 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 232 if (!se_sess) {
233 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 234 " se_sess_cache\n");
235 return ERR_PTR(-ENOMEM);
236 }
237 INIT_LIST_HEAD(&se_sess->sess_list);
238 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 239 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 240 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 241 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 242 kref_init(&se_sess->sess_kref);
e70beee7 243 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 244
245 return se_sess;
246}
247EXPORT_SYMBOL(transport_init_session);
248
c0add7fd
NB		 249int transport_alloc_session_tags(struct se_session *se_sess,
250 unsigned int tag_num, unsigned int tag_size)
251{
252 int rc;
253
8c7f6e9b
NB		 254 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
255 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 256 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 257 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
258 if (!se_sess->sess_cmd_map) {
259 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
260 return -ENOMEM;
261 }
c0add7fd
NB		 262 }
263
264 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
265 if (rc < 0) {
266 pr_err("Unable to init se_sess->sess_tag_pool,"
267 " tag_num: %u\n", tag_num);
de64d3a6 268 kvfree(se_sess->sess_cmd_map);
c0add7fd
NB		 269 se_sess->sess_cmd_map = NULL;
270 return -ENOMEM;
271 }
272
273 return 0;
274}
275EXPORT_SYMBOL(transport_alloc_session_tags);
276
277struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 278 unsigned int tag_size,
279 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 280{
281 struct se_session *se_sess;
282 int rc;
283
e70beee7 284 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 285 if (IS_ERR(se_sess))
286 return se_sess;
287
288 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
289 if (rc < 0) {
290 transport_free_session(se_sess);
291 return ERR_PTR(-ENOMEM);
292 }
293
294 return se_sess;
295}
296EXPORT_SYMBOL(transport_init_session_tags);
297
c66ac9db 298/*
140854cb 299 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 300 */
301void __transport_register_session(
302 struct se_portal_group *se_tpg,
303 struct se_node_acl *se_nacl,
304 struct se_session *se_sess,
305 void *fabric_sess_ptr)
306{
9ac8928e 307 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 308 unsigned char buf[PR_REG_ISID_LEN];
309
310 se_sess->se_tpg = se_tpg;
311 se_sess->fabric_sess_ptr = fabric_sess_ptr;
312 /*
313 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
314 *
315 * Only set for struct se_session's that will actually be moving I/O.
316 * eg: *NOT* discovery sessions.
317 */
318 if (se_nacl) {
bffb5128
NB		 319 /*
320 *
321 * Determine if fabric allows for T10-PI feature bits exposed to
322 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
323 *
324 * If so, then always save prot_type on a per se_node_acl node
325 * basis and re-instate the previous sess_prot_type to avoid
326 * disabling PI from below any previously initiator side
327 * registered LUNs.
328 */
329 if (se_nacl->saved_prot_type)
330 se_sess->sess_prot_type = se_nacl->saved_prot_type;
331 else if (tfo->tpg_check_prot_fabric_only)
332 se_sess->sess_prot_type = se_nacl->saved_prot_type =
333 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 334 /*
335 * If the fabric module supports an ISID based TransportID,
336 * save this value in binary from the fabric I_T Nexus now.
337 */
e3d6f909 338 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 339 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 340 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 341 &buf[0], PR_REG_ISID_LEN);
342 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
343 }
afb999ff 344
c66ac9db
NB		 345 spin_lock_irq(&se_nacl->nacl_sess_lock);
346 /*
347 * The se_nacl->nacl_sess pointer will be set to the
348 * last active I_T Nexus for each struct se_node_acl.
349 */
350 se_nacl->nacl_sess = se_sess;
351
352 list_add_tail(&se_sess->sess_acl_list,
353 &se_nacl->acl_sess_list);
354 spin_unlock_irq(&se_nacl->nacl_sess_lock);
355 }
356 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
357
6708bb27 358 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 359 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 360}
361EXPORT_SYMBOL(__transport_register_session);
362
363void transport_register_session(
364 struct se_portal_group *se_tpg,
365 struct se_node_acl *se_nacl,
366 struct se_session *se_sess,
367 void *fabric_sess_ptr)
368{
140854cb
NB		 369 unsigned long flags;
370
371 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 372 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 373 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 374}
375EXPORT_SYMBOL(transport_register_session);
376
ecf0dd66 377static void target_release_session(struct kref *kref)
41ac82b6
NB		 378{
379 struct se_session *se_sess = container_of(kref,
380 struct se_session, sess_kref);
381 struct se_portal_group *se_tpg = se_sess->se_tpg;
382
383 se_tpg->se_tpg_tfo->close_session(se_sess);
384}
385
d36ad77f 386int target_get_session(struct se_session *se_sess)
41ac82b6 387{
d36ad77f 388 return kref_get_unless_zero(&se_sess->sess_kref);
41ac82b6
NB		 389}
390EXPORT_SYMBOL(target_get_session);
391
33933a0e 392void target_put_session(struct se_session *se_sess)
41ac82b6 393{
33933a0e 394 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 395}
396EXPORT_SYMBOL(target_put_session);
397
f8e471f9
NB		 398ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
399{
400 struct se_session *se_sess;
401 ssize_t len = 0;
402
403 spin_lock_bh(&se_tpg->session_lock);
404 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
405 if (!se_sess->se_node_acl)
406 continue;
407 if (!se_sess->se_node_acl->dynamic_node_acl)
408 continue;
409 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
410 break;
411
412 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
413 se_sess->se_node_acl->initiatorname);
414 len += 1; /* Include NULL terminator */
415 }
416 spin_unlock_bh(&se_tpg->session_lock);
417
418 return len;
419}
420EXPORT_SYMBOL(target_show_dynamic_sessions);
421
afb999ff
NB		 422static void target_complete_nacl(struct kref *kref)
423{
424 struct se_node_acl *nacl = container_of(kref,
425 struct se_node_acl, acl_kref);
426
427 complete(&nacl->acl_free_comp);
428}
429
430void target_put_nacl(struct se_node_acl *nacl)
431{
432 kref_put(&nacl->acl_kref, target_complete_nacl);
433}
21aaa23b 434EXPORT_SYMBOL(target_put_nacl);
afb999ff 435
c66ac9db
NB		 436void transport_deregister_session_configfs(struct se_session *se_sess)
437{
438 struct se_node_acl *se_nacl;
23388864 439 unsigned long flags;
c66ac9db
NB		 440 /*
441 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
442 */
443 se_nacl = se_sess->se_node_acl;
6708bb27 444 if (se_nacl) {
23388864 445 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 446 if (se_nacl->acl_stop == 0)
447 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 448 /*
449 * If the session list is empty, then clear the pointer.
450 * Otherwise, set the struct se_session pointer from the tail
451 * element of the per struct se_node_acl active session list.
452 */
453 if (list_empty(&se_nacl->acl_sess_list))
454 se_nacl->nacl_sess = NULL;
455 else {
456 se_nacl->nacl_sess = container_of(
457 se_nacl->acl_sess_list.prev,
458 struct se_session, sess_acl_list);
459 }
23388864 460 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 461 }
462}
463EXPORT_SYMBOL(transport_deregister_session_configfs);
464
465void transport_free_session(struct se_session *se_sess)
466{
21aaa23b
NB		 467 struct se_node_acl *se_nacl = se_sess->se_node_acl;
468 /*
469 * Drop the se_node_acl->nacl_kref obtained from within
470 * core_tpg_get_initiator_node_acl().
471 */
472 if (se_nacl) {
473 se_sess->se_node_acl = NULL;
474 target_put_nacl(se_nacl);
475 }
c0add7fd
NB		 476 if (se_sess->sess_cmd_map) {
477 percpu_ida_destroy(&se_sess->sess_tag_pool);
de64d3a6 478 kvfree(se_sess->sess_cmd_map);
c0add7fd 479 }
c66ac9db
NB		 480 kmem_cache_free(se_sess_cache, se_sess);
481}
482EXPORT_SYMBOL(transport_free_session);
483
484void transport_deregister_session(struct se_session *se_sess)
485{
486 struct se_portal_group *se_tpg = se_sess->se_tpg;
9ac8928e 487 const struct target_core_fabric_ops *se_tfo;
c66ac9db 488 struct se_node_acl *se_nacl;
e63a8e19 489 unsigned long flags;
21aaa23b 490 bool drop_nacl = false;
c66ac9db 491
6708bb27 492 if (!se_tpg) {
c66ac9db
NB		 493 transport_free_session(se_sess);
494 return;
495 }
01468346 496 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 497
e63a8e19 498 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 499 list_del(&se_sess->sess_list);
500 se_sess->se_tpg = NULL;
501 se_sess->fabric_sess_ptr = NULL;
e63a8e19 502 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 503
504 /*
505 * Determine if we need to do extra work for this initiator node's
506 * struct se_node_acl if it had been previously dynamically generated.
507 */
508 se_nacl = se_sess->se_node_acl;
01468346 509
403edd78 510 mutex_lock(&se_tpg->acl_node_mutex);
01468346
NB		 511 if (se_nacl && se_nacl->dynamic_node_acl) {
512 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
513 list_del(&se_nacl->acl_list);
403edd78 514 drop_nacl = true;
c66ac9db 515 }
c66ac9db 516 }
403edd78 517 mutex_unlock(&se_tpg->acl_node_mutex);
c66ac9db 518
403edd78
NB		 519 if (drop_nacl) {
520 core_tpg_wait_for_nacl_pr_ref(se_nacl);
521 core_free_device_list_for_node(se_nacl, se_tpg);
21aaa23b 522 se_sess->se_node_acl = NULL;
403edd78 523 kfree(se_nacl);
403edd78 524 }
6708bb27 525 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 526 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 527 /*
125d0119 528 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff 529 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
21aaa23b 530 * removal context from within transport_free_session() code.
01468346 531 */
01468346 532
afb999ff 533 transport_free_session(se_sess);
c66ac9db
NB		 534}
535EXPORT_SYMBOL(transport_deregister_session);
536
cf572a96 537static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 538{
42bf829e 539 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 540 unsigned long flags;
541
42bf829e
CH		 542 if (!dev)
543 return;
c66ac9db 544
cf572a96
CH		 545 if (cmd->transport_state & CMD_T_BUSY)
546 return;
c66ac9db 547
cf572a96
CH		 548 spin_lock_irqsave(&dev->execute_task_lock, flags);
549 if (cmd->state_active) {
550 list_del(&cmd->state_list);
cf572a96 551 cmd->state_active = false;
c66ac9db 552 }
cf572a96 553 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 554}
555
862e6389
NB		 556static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
557 bool write_pending)
c66ac9db
NB		 558{
559 unsigned long flags;
560
f7113a47
CH		 561 if (remove_from_lists) {
562 target_remove_from_state_list(cmd);
563
564 /*
565 * Clear struct se_cmd->se_lun before the handoff to FE.
566 */
567 cmd->se_lun = NULL;
568 }
569
febe562c
NB		 570 spin_lock_irqsave(&cmd->t_state_lock, flags);
571 if (write_pending)
572 cmd->t_state = TRANSPORT_WRITE_PENDING;
573
c66ac9db
NB		 574 /*
575 * Determine if frontend context caller is requesting the stopping of
e3d6f909 576 * this command for frontend exceptions.
c66ac9db 577 */
7d680f3b 578 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 579 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
580 __func__, __LINE__, cmd->tag);
c66ac9db 581
a1d8b49a 582 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 583
a95d6511 584 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 585 return 1;
586 }
f7113a47
CH		 587
588 cmd->transport_state &= ~CMD_T_ACTIVE;
589 if (remove_from_lists) {
590 /*
591 * Some fabric modules like tcm_loop can release
592 * their internally allocated I/O reference now and
593 * struct se_cmd now.
594 *
595 * Fabric modules are expected to return '1' here if the
596 * se_cmd being passed is released at this point,
597 * or zero if not being released.
598 */
599 if (cmd->se_tfo->check_stop_free != NULL) {
600 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
601 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 602 }
f7113a47 603 }
c66ac9db 604
a1d8b49a 605 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 606 return 0;
607}
608
609static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
610{
862e6389 611 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 612}
613
614static void transport_lun_remove_cmd(struct se_cmd *cmd)
615{
e3d6f909 616 struct se_lun *lun = cmd->se_lun;
c66ac9db 617
5259a06e 618 if (!lun)
c66ac9db
NB		 619 return;
620
5259a06e
NB		 621 if (cmpxchg(&cmd->lun_ref_active, true, false))
622 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 623}
624
625void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
626{
febe562c
NB		 627 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
628
68259b5a
AL		 629 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
630 transport_lun_remove_cmd(cmd);
131e6abc
NB		 631 /*
632 * Allow the fabric driver to unmap any resources before
633 * releasing the descriptor via TFO->release_cmd()
634 */
635 if (remove)
636 cmd->se_tfo->aborted_task(cmd);
68259b5a 637
c66ac9db
NB		 638 if (transport_cmd_check_stop_to_fabric(cmd))
639 return;
febe562c 640 if (remove && ack_kref)
e6a2573f 641 transport_put_cmd(cmd);
c66ac9db
NB		 642}
643
35e0e757
CH		 644static void target_complete_failure_work(struct work_struct *work)
645{
646 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
647
de103c93
CH		 648 transport_generic_request_failure(cmd,
649 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 650}
651
6138ed2a 652/*
d5829eac
PB		 653 * Used when asking transport to copy Sense Data from the underlying
654 * Linux/SCSI struct scsi_cmnd
6138ed2a 655 */
d5829eac 656static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 657{
6138ed2a 658 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 659
660 WARN_ON(!cmd->se_lun);
661
662 if (!dev)
d5829eac 663 return NULL;
6138ed2a 664
d5829eac
PB		 665 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
666 return NULL;
6138ed2a 667
9c58b7dd 668 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 669
d5829eac 670 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 671 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 672 return cmd->sense_buffer;
6138ed2a
PB		 673}
674
5787cacd 675void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 676{
42bf829e 677 struct se_device *dev = cmd->se_dev;
5787cacd 678 int success = scsi_status == GOOD;
c66ac9db 679 unsigned long flags;
c66ac9db 680
5787cacd
CH		 681 cmd->scsi_status = scsi_status;
682
683
a1d8b49a 684 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 685 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 686
c66ac9db 687 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 688 dev->transport->transport_complete(cmd,
689 cmd->t_data_sg,
690 transport_get_sense_buffer(cmd));
691 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 692 success = 1;
c66ac9db
NB		 693 }
694
3d28934a 695 /*
125d0119 696 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 697 * and transport_wait_for_tasks() will be waiting for completion..
698 */
febe562c 699 if (cmd->transport_state & CMD_T_ABORTED ||
3d28934a
NB		 700 cmd->transport_state & CMD_T_STOP) {
701 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 702 complete_all(&cmd->t_transport_stop_comp);
3d28934a 703 return;
3dca1471 704 } else if (!success) {
35e0e757 705 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 706 } else {
35e0e757 707 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 708 }
35e0e757 709
35e0e757 710 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 711 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 712 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 713
9095adaa 714 if (cmd->se_cmd_flags & SCF_USE_CPUID)
fb3269ba 715 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
9095adaa
QT		 716 else
717 queue_work(target_completion_wq, &cmd->work);
c66ac9db 718}
6bb35e00
CH		 719EXPORT_SYMBOL(target_complete_cmd);
720
2426bd45
RD		 721void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
722{
723 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
724 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
725 cmd->residual_count += cmd->data_length - length;
726 } else {
727 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
728 cmd->residual_count = cmd->data_length - length;
729 }
730
731 cmd->data_length = length;
732 }
733
734 target_complete_cmd(cmd, scsi_status);
735}
736EXPORT_SYMBOL(target_complete_cmd_with_length);
737
cf572a96 738static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 739{
cf572a96
CH		 740 struct se_device *dev = cmd->se_dev;
741 unsigned long flags;
c66ac9db 742
cf572a96
CH		 743 spin_lock_irqsave(&dev->execute_task_lock, flags);
744 if (!cmd->state_active) {
745 list_add_tail(&cmd->state_list, &dev->state_list);
746 cmd->state_active = true;
c66ac9db 747 }
cf572a96 748 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 749}
750
07bde79a 751/*
f147abb4 752 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 753 */
7a6f0a1e
CH		 754static void transport_write_pending_qf(struct se_cmd *cmd);
755static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 756
0fd97ccf 757void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 758{
759 struct se_device *dev = container_of(work, struct se_device,
760 qf_work_queue);
bcac364a 761 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 762 struct se_cmd *cmd, *cmd_tmp;
763
764 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 765 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
766 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 767
bcac364a 768 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 769 list_del(&cmd->se_qf_node);
33940d09 770 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 771
6708bb27 772 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 773 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 774 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 775 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
776 : "UNKNOWN");
f7a5cc0b 777
7a6f0a1e
CH		 778 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
779 transport_write_pending_qf(cmd);
780 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
781 transport_complete_qf(cmd);
07bde79a 782 }
07bde79a
NB		 783}
784
c66ac9db
NB		 785unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
786{
787 switch (cmd->data_direction) {
788 case DMA_NONE:
789 return "NONE";
790 case DMA_FROM_DEVICE:
791 return "READ";
792 case DMA_TO_DEVICE:
793 return "WRITE";
794 case DMA_BIDIRECTIONAL:
795 return "BIDI";
796 default:
797 break;
798 }
799
800 return "UNKNOWN";
801}
802
803void transport_dump_dev_state(
804 struct se_device *dev,
805 char *b,
806 int *bl)
807{
808 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 809 if (dev->export_count)
c66ac9db 810 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 811 else
c66ac9db 812 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 813
5f41a31d 814 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 815 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 816 dev->dev_attrib.block_size,
817 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 818 *bl += sprintf(b + *bl, " ");
819}
820
c66ac9db
NB		 821void transport_dump_vpd_proto_id(
822 struct t10_vpd *vpd,
823 unsigned char *p_buf,
824 int p_buf_len)
825{
826 unsigned char buf[VPD_TMP_BUF_SIZE];
827 int len;
828
829 memset(buf, 0, VPD_TMP_BUF_SIZE);
830 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
831
832 switch (vpd->protocol_identifier) {
833 case 0x00:
834 sprintf(buf+len, "Fibre Channel\n");
835 break;
836 case 0x10:
837 sprintf(buf+len, "Parallel SCSI\n");
838 break;
839 case 0x20:
840 sprintf(buf+len, "SSA\n");
841 break;
842 case 0x30:
843 sprintf(buf+len, "IEEE 1394\n");
844 break;
845 case 0x40:
846 sprintf(buf+len, "SCSI Remote Direct Memory Access"
847 " Protocol\n");
848 break;
849 case 0x50:
850 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
851 break;
852 case 0x60:
853 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
854 break;
855 case 0x70:
856 sprintf(buf+len, "Automation/Drive Interface Transport"
857 " Protocol\n");
858 break;
859 case 0x80:
860 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
861 break;
862 default:
863 sprintf(buf+len, "Unknown 0x%02x\n",
864 vpd->protocol_identifier);
865 break;
866 }
867
868 if (p_buf)
869 strncpy(p_buf, buf, p_buf_len);
870 else
6708bb27 871 pr_debug("%s", buf);
c66ac9db
NB		 872}
873
874void
875transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
876{
877 /*
878 * Check if the Protocol Identifier Valid (PIV) bit is set..
879 *
880 * from spc3r23.pdf section 7.5.1
881 */
882 if (page_83[1] & 0x80) {
883 vpd->protocol_identifier = (page_83[0] & 0xf0);
884 vpd->protocol_identifier_set = 1;
885 transport_dump_vpd_proto_id(vpd, NULL, 0);
886 }
887}
888EXPORT_SYMBOL(transport_set_vpd_proto_id);
889
890int transport_dump_vpd_assoc(
891 struct t10_vpd *vpd,
892 unsigned char *p_buf,
893 int p_buf_len)
894{
895 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 896 int ret = 0;
897 int len;
c66ac9db
NB		 898
899 memset(buf, 0, VPD_TMP_BUF_SIZE);
900 len = sprintf(buf, "T10 VPD Identifier Association: ");
901
902 switch (vpd->association) {
903 case 0x00:
904 sprintf(buf+len, "addressed logical unit\n");
905 break;
906 case 0x10:
907 sprintf(buf+len, "target port\n");
908 break;
909 case 0x20:
910 sprintf(buf+len, "SCSI target device\n");
911 break;
912 default:
913 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 914 ret = -EINVAL;
c66ac9db
NB		 915 break;
916 }
917
918 if (p_buf)
919 strncpy(p_buf, buf, p_buf_len);
920 else
6708bb27 921 pr_debug("%s", buf);
c66ac9db
NB		 922
923 return ret;
924}
925
926int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
927{
928 /*
929 * The VPD identification association..
930 *
931 * from spc3r23.pdf Section 7.6.3.1 Table 297
932 */
933 vpd->association = (page_83[1] & 0x30);
934 return transport_dump_vpd_assoc(vpd, NULL, 0);
935}
936EXPORT_SYMBOL(transport_set_vpd_assoc);
937
938int transport_dump_vpd_ident_type(
939 struct t10_vpd *vpd,
940 unsigned char *p_buf,
941 int p_buf_len)
942{
943 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 944 int ret = 0;
945 int len;
c66ac9db
NB		 946
947 memset(buf, 0, VPD_TMP_BUF_SIZE);
948 len = sprintf(buf, "T10 VPD Identifier Type: ");
949
950 switch (vpd->device_identifier_type) {
951 case 0x00:
952 sprintf(buf+len, "Vendor specific\n");
953 break;
954 case 0x01:
955 sprintf(buf+len, "T10 Vendor ID based\n");
956 break;
957 case 0x02:
958 sprintf(buf+len, "EUI-64 based\n");
959 break;
960 case 0x03:
961 sprintf(buf+len, "NAA\n");
962 break;
963 case 0x04:
964 sprintf(buf+len, "Relative target port identifier\n");
965 break;
966 case 0x08:
967 sprintf(buf+len, "SCSI name string\n");
968 break;
969 default:
970 sprintf(buf+len, "Unsupported: 0x%02x\n",
971 vpd->device_identifier_type);
e3d6f909 972 ret = -EINVAL;
c66ac9db
NB		 973 break;
974 }
975
e3d6f909
AG		 976 if (p_buf) {
977 if (p_buf_len < strlen(buf)+1)
978 return -EINVAL;
c66ac9db 979 strncpy(p_buf, buf, p_buf_len);
e3d6f909 980 } else {
6708bb27 981 pr_debug("%s", buf);
e3d6f909 982 }
c66ac9db
NB		 983
984 return ret;
985}
986
987int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
988{
989 /*
990 * The VPD identifier type..
991 *
992 * from spc3r23.pdf Section 7.6.3.1 Table 298
993 */
994 vpd->device_identifier_type = (page_83[1] & 0x0f);
995 return transport_dump_vpd_ident_type(vpd, NULL, 0);
996}
997EXPORT_SYMBOL(transport_set_vpd_ident_type);
998
999int transport_dump_vpd_ident(
1000 struct t10_vpd *vpd,
1001 unsigned char *p_buf,
1002 int p_buf_len)
1003{
1004 unsigned char buf[VPD_TMP_BUF_SIZE];
1005 int ret = 0;
1006
1007 memset(buf, 0, VPD_TMP_BUF_SIZE);
1008
1009 switch (vpd->device_identifier_code_set) {
1010 case 0x01: /* Binary */
703d641d
DC		 1011 snprintf(buf, sizeof(buf),
1012 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1013 &vpd->device_identifier[0]);
1014 break;
1015 case 0x02: /* ASCII */
703d641d
DC		 1016 snprintf(buf, sizeof(buf),
1017 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1018 &vpd->device_identifier[0]);
1019 break;
1020 case 0x03: /* UTF-8 */
703d641d
DC		 1021 snprintf(buf, sizeof(buf),
1022 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1023 &vpd->device_identifier[0]);
1024 break;
1025 default:
1026 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1027 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1028 ret = -EINVAL;
c66ac9db
NB		 1029 break;
1030 }
1031
1032 if (p_buf)
1033 strncpy(p_buf, buf, p_buf_len);
1034 else
6708bb27 1035 pr_debug("%s", buf);
c66ac9db
NB		 1036
1037 return ret;
1038}
1039
1040int
1041transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1042{
1043 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1044 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1045
1046 /*
1047 * The VPD Code Set (encoding)
1048 *
1049 * from spc3r23.pdf Section 7.6.3.1 Table 296
1050 */
1051 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1052 switch (vpd->device_identifier_code_set) {
1053 case 0x01: /* Binary */
1054 vpd->device_identifier[j++] =
1055 hex_str[vpd->device_identifier_type];
1056 while (i < (4 + page_83[3])) {
1057 vpd->device_identifier[j++] =
1058 hex_str[(page_83[i] & 0xf0) >> 4];
1059 vpd->device_identifier[j++] =
1060 hex_str[page_83[i] & 0x0f];
1061 i++;
1062 }
1063 break;
1064 case 0x02: /* ASCII */
1065 case 0x03: /* UTF-8 */
1066 while (i < (4 + page_83[3]))
1067 vpd->device_identifier[j++] = page_83[i++];
1068 break;
1069 default:
1070 break;
1071 }
1072
1073 return transport_dump_vpd_ident(vpd, NULL, 0);
1074}
1075EXPORT_SYMBOL(transport_set_vpd_ident);
1076
8f9b5654
NB		 1077static sense_reason_t
1078target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1079 unsigned int size)
1080{
1081 u32 mtl;
1082
1083 if (!cmd->se_tfo->max_data_sg_nents)
1084 return TCM_NO_SENSE;
1085 /*
1086 * Check if fabric enforced maximum SGL entries per I/O descriptor
1087 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1088 * residual_count and reduce original cmd->data_length to maximum
1089 * length based on single PAGE_SIZE entry scatter-lists.
1090 */
1091 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1092 if (cmd->data_length > mtl) {
1093 /*
1094 * If an existing CDB overflow is present, calculate new residual
1095 * based on CDB size minus fabric maximum transfer length.
1096 *
1097 * If an existing CDB underflow is present, calculate new residual
1098 * based on original cmd->data_length minus fabric maximum transfer
1099 * length.
1100 *
1101 * Otherwise, set the underflow residual based on cmd->data_length
1102 * minus fabric maximum transfer length.
1103 */
1104 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1105 cmd->residual_count = (size - mtl);
1106 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1107 u32 orig_dl = size + cmd->residual_count;
1108 cmd->residual_count = (orig_dl - mtl);
1109 } else {
1110 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1111 cmd->residual_count = (cmd->data_length - mtl);
1112 }
1113 cmd->data_length = mtl;
1114 /*
1115 * Reset sbc_check_prot() calculated protection payload
1116 * length based upon the new smaller MTL.
1117 */
1118 if (cmd->prot_length) {
1119 u32 sectors = (mtl / dev->dev_attrib.block_size);
1120 cmd->prot_length = dev->prot_length * sectors;
1121 }
1122 }
1123 return TCM_NO_SENSE;
1124}
1125
de103c93
CH		 1126sense_reason_t
1127target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1128{
1129 struct se_device *dev = cmd->se_dev;
1130
1131 if (cmd->unknown_data_length) {
1132 cmd->data_length = size;
1133 } else if (size != cmd->data_length) {
1134 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1135 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1136 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1137 cmd->data_length, size, cmd->t_task_cdb[0]);
1138
c72c5250
RD		 1139 if (cmd->data_direction == DMA_TO_DEVICE &&
1140 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1141 pr_err("Rejecting underflow/overflow WRITE data\n");
de103c93 1142 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1143 }
1144 /*
1145 * Reject READ_* or WRITE_* with overflow/underflow for
1146 * type SCF_SCSI_DATA_CDB.
1147 */
0fd97ccf 1148 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1149 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1150 " CDB on non 512-byte sector setup subsystem"
1151 " plugin: %s\n", dev->transport->name);
1152 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1153 return TCM_INVALID_CDB_FIELD;
9b3b8041 1154 }
4c054ba6
NB		 1155 /*
1156 * For the overflow case keep the existing fabric provided
1157 * ->data_length. Otherwise for the underflow case, reset
1158 * ->data_length to the smaller SCSI expected data transfer
1159 * length.
1160 */
9b3b8041
CH		 1161 if (size > cmd->data_length) {
1162 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1163 cmd->residual_count = (size - cmd->data_length);
1164 } else {
1165 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1166 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1167 cmd->data_length = size;
9b3b8041 1168 }
9b3b8041
CH		 1169 }
1170
8f9b5654 1171 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1172
9b3b8041
CH		 1173}
1174
c66ac9db
NB		 1175/*
1176 * Used by fabric modules containing a local struct se_cmd within their
1177 * fabric dependent per I/O descriptor.
649ee054
BVA		 1178 *
1179 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1180 */
1181void transport_init_se_cmd(
1182 struct se_cmd *cmd,
9ac8928e 1183 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1184 struct se_session *se_sess,
1185 u32 data_length,
1186 int data_direction,
1187 int task_attr,
1188 unsigned char *sense_buffer)
1189{
5951146d 1190 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1191 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1192 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1193 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1194 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1195 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1196 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1197 kref_init(&cmd->cmd_kref);
7d680f3b 1198 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1199
1200 cmd->se_tfo = tfo;
1201 cmd->se_sess = se_sess;
1202 cmd->data_length = data_length;
1203 cmd->data_direction = data_direction;
1204 cmd->sam_task_attr = task_attr;
1205 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1206
1207 cmd->state_active = false;
c66ac9db
NB		 1208}
1209EXPORT_SYMBOL(transport_init_se_cmd);
1210
de103c93
CH		 1211static sense_reason_t
1212transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1213{
019c4ca6
CH		 1214 struct se_device *dev = cmd->se_dev;
1215
c66ac9db
NB		 1216 /*
1217 * Check if SAM Task Attribute emulation is enabled for this
1218 * struct se_device storage object
1219 */
a3541703 1220 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1221 return 0;
1222
68d81f40 1223 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1224 pr_debug("SAM Task Attribute ACA"
c66ac9db 1225 " emulation is not supported\n");
de103c93 1226 return TCM_INVALID_CDB_FIELD;
c66ac9db 1227 }
9c31820b 1228
c66ac9db
NB		 1229 return 0;
1230}
1231
de103c93
CH		 1232sense_reason_t
1233target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1234{
0fd97ccf 1235 struct se_device *dev = cmd->se_dev;
de103c93 1236 sense_reason_t ret;
c66ac9db 1237
c66ac9db
NB		 1238 /*
1239 * Ensure that the received CDB is less than the max (252 + 8) bytes
1240 * for VARIABLE_LENGTH_CMD
1241 */
1242 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1243 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1244 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1245 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1246 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1247 }
1248 /*
1249 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1250 * allocate the additional extended CDB buffer now.. Otherwise
1251 * setup the pointer from __t_task_cdb to t_task_cdb.
1252 */
a1d8b49a
AG		 1253 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1254 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1255 GFP_KERNEL);
6708bb27
AG		 1256 if (!cmd->t_task_cdb) {
1257 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1258 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1259 scsi_command_size(cdb),
a1d8b49a 1260 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1261 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1262 }
1263 } else
a1d8b49a 1264 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1265 /*
a1d8b49a 1266 * Copy the original CDB into cmd->
c66ac9db 1267 */
a1d8b49a 1268 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1269
e5c0d6ad
RD		 1270 trace_target_sequencer_start(cmd);
1271
cb4f4d3c
CH		 1272 /*
1273 * Check for an existing UNIT ATTENTION condition
1274 */
de103c93
CH		 1275 ret = target_scsi3_ua_check(cmd);
1276 if (ret)
1277 return ret;
cb4f4d3c 1278
c87fbd56 1279 ret = target_alua_state_check(cmd);
de103c93
CH		 1280 if (ret)
1281 return ret;
cb4f4d3c 1282
d977f437 1283 ret = target_check_reservation(cmd);
f85eda8d
NB		 1284 if (ret) {
1285 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1286 return ret;
f85eda8d 1287 }
cb4f4d3c 1288
0fd97ccf 1289 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1290 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1291 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1292 cmd->se_tfo->get_fabric_name(),
1293 cmd->se_sess->se_node_acl->initiatorname,
1294 cmd->t_task_cdb[0]);
de103c93
CH		 1295 if (ret)
1296 return ret;
1297
1298 ret = transport_check_alloc_task_attr(cmd);
1299 if (ret)
c66ac9db 1300 return ret;
cb4f4d3c 1301
cb4f4d3c 1302 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1303 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1304 return 0;
1305}
a12f41f8 1306EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1307
695434e1
NB		 1308/*
1309 * Used by fabric module frontends to queue tasks directly.
ac75d8be 1310 * May only be used from process context.
695434e1
NB		 1311 */
1312int transport_handle_cdb_direct(
1313 struct se_cmd *cmd)
1314{
de103c93 1315 sense_reason_t ret;
dd8ae59d 1316
695434e1
NB		 1317 if (!cmd->se_lun) {
1318 dump_stack();
6708bb27 1319 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1320 return -EINVAL;
1321 }
1322 if (in_interrupt()) {
1323 dump_stack();
6708bb27 1324 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1325 " from interrupt context\n");
1326 return -EINVAL;
1327 }
dd8ae59d 1328 /*
af877292
CH		 1329 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1330 * outstanding descriptors are handled correctly during shutdown via
1331 * transport_wait_for_tasks()
dd8ae59d
NB		 1332 *
1333 * Also, we don't take cmd->t_state_lock here as we only expect
1334 * this to be called for initial descriptor submission.
1335 */
1336 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1337 cmd->transport_state |= CMD_T_ACTIVE;
1338
dd8ae59d
NB		 1339 /*
1340 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1341 * so follow TRANSPORT_NEW_CMD processing thread context usage
1342 * and call transport_generic_request_failure() if necessary..
1343 */
1344 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1345 if (ret)
1346 transport_generic_request_failure(cmd, ret);
dd8ae59d 1347 return 0;
695434e1
NB		 1348}
1349EXPORT_SYMBOL(transport_handle_cdb_direct);
1350
c5ff8d6b 1351sense_reason_t
de103c93
CH		 1352transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1353 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1354{
1355 if (!sgl || !sgl_count)
1356 return 0;
1357
1358 /*
1359 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1360 * scatterlists already have been set to follow what the fabric
1361 * passes for the original expected data transfer length.
1362 */
1363 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1364 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1365 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1366 return TCM_INVALID_CDB_FIELD;
1367 }
1368
1369 cmd->t_data_sg = sgl;
1370 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1371 cmd->t_bidi_data_sg = sgl_bidi;
1372 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1373
de103c93
CH		 1374 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1375 return 0;
1376}
1377
a026757f
NB		 1378/*
1379 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1380 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1381 *
1382 * @se_cmd: command descriptor to submit
1383 * @se_sess: associated se_sess for endpoint
1384 * @cdb: pointer to SCSI CDB
1385 * @sense: pointer to SCSI sense buffer
1386 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1387 * @data_length: fabric expected data transfer length
1388 * @task_addr: SAM task attribute
1389 * @data_dir: DMA data direction
1390 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1391 * @sgl: struct scatterlist memory for unidirectional mapping
1392 * @sgl_count: scatterlist count for unidirectional mapping
1393 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1394 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1395 * @sgl_prot: struct scatterlist memory protection information
1396 * @sgl_prot_count: scatterlist count for protection information
a6360785 1397 *
649ee054
BVA		 1398 * Task tags are supported if the caller has set @se_cmd->tag.
1399 *
d6dfc868
RD		 1400 * Returns non zero to signal active I/O shutdown failure. All other
1401 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1402 * but still return zero here.
1403 *
a6360785
NB		 1404 * This may only be called from process context, and also currently
1405 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1406 */
1407int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1408 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1409 u32 data_length, int task_attr, int data_dir, int flags,
1410 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1411 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1412 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1413{
1414 struct se_portal_group *se_tpg;
de103c93
CH		 1415 sense_reason_t rc;
1416 int ret;
a6360785
NB		 1417
1418 se_tpg = se_sess->se_tpg;
1419 BUG_ON(!se_tpg);
1420 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1421 BUG_ON(in_interrupt());
1422 /*
1423 * Initialize se_cmd for target operation. From this point
1424 * exceptions are handled by sending exception status via
1425 * target_core_fabric_ops->queue_status() callback
1426 */
1427 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1428 data_length, data_dir, task_attr, sense);
9095adaa
QT		 1429
1430 if (flags & TARGET_SCF_USE_CPUID)
1431 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1432 else
1433 se_cmd->cpuid = WORK_CPU_UNBOUND;
1434
b0d79946
SAS		 1435 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1436 se_cmd->unknown_data_length = 1;
a6360785
NB		 1437 /*
1438 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1439 * se_sess->sess_cmd_list. A second kref_get here is necessary
1440 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1441 * kref_put() to happen during fabric packet acknowledgement.
1442 */
afc16604 1443 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1444 if (ret)
1445 return ret;
a6360785
NB		 1446 /*
1447 * Signal bidirectional data payloads to target-core
1448 */
1449 if (flags & TARGET_SCF_BIDI_OP)
1450 se_cmd->se_cmd_flags |= SCF_BIDI;
1451 /*
1452 * Locate se_lun pointer and attach it to struct se_cmd
1453 */
de103c93
CH		 1454 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1455 if (rc) {
1456 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1457 target_put_sess_cmd(se_cmd);
d6dfc868 1458 return 0;
735703ca 1459 }
b5b8e298
SG		 1460
1461 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1462 if (rc != 0) {
1463 transport_generic_request_failure(se_cmd, rc);
1464 return 0;
1465 }
1466
def2b339
NB		 1467 /*
1468 * Save pointers for SGLs containing protection information,
1469 * if present.
1470 */
1471 if (sgl_prot_count) {
1472 se_cmd->t_prot_sg = sgl_prot;
1473 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1474 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1475 }
d6e0175c 1476
a026757f
NB		 1477 /*
1478 * When a non zero sgl_count has been passed perform SGL passthrough
1479 * mapping for pre-allocated fabric memory instead of having target
1480 * core perform an internal SGL allocation..
1481 */
1482 if (sgl_count != 0) {
1483 BUG_ON(!sgl);
1484
944981c7
NB		 1485 /*
1486 * A work-around for tcm_loop as some userspace code via
1487 * scsi-generic do not memset their associated read buffers,
1488 * so go ahead and do that here for type non-data CDBs. Also
1489 * note that this is currently guaranteed to be a single SGL
1490 * for this case by target core in target_setup_cmd_from_cdb()
1491 * -> transport_generic_cmd_sequencer().
1492 */
1493 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1494 se_cmd->data_direction == DMA_FROM_DEVICE) {
1495 unsigned char *buf = NULL;
1496
1497 if (sgl)
1498 buf = kmap(sg_page(sgl)) + sgl->offset;
1499
1500 if (buf) {
1501 memset(buf, 0, sgl->length);
1502 kunmap(sg_page(sgl));
1503 }
1504 }
1505
a026757f
NB		 1506 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1507 sgl_bidi, sgl_bidi_count);
1508 if (rc != 0) {
de103c93 1509 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1510 return 0;
1511 }
1512 }
def2b339 1513
11e319ed
AG		 1514 /*
1515 * Check if we need to delay processing because of ALUA
1516 * Active/NonOptimized primary access state..
1517 */
1518 core_alua_check_nonop_delay(se_cmd);
1519
a6360785 1520 transport_handle_cdb_direct(se_cmd);
d6dfc868 1521 return 0;
a6360785 1522}
a026757f
NB		 1523EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1524
1525/*
1526 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1527 *
1528 * @se_cmd: command descriptor to submit
1529 * @se_sess: associated se_sess for endpoint
1530 * @cdb: pointer to SCSI CDB
1531 * @sense: pointer to SCSI sense buffer
1532 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1533 * @data_length: fabric expected data transfer length
1534 * @task_addr: SAM task attribute
1535 * @data_dir: DMA data direction
1536 * @flags: flags for command submission from target_sc_flags_tables
1537 *
649ee054
BVA		 1538 * Task tags are supported if the caller has set @se_cmd->tag.
1539 *
a026757f
NB		 1540 * Returns non zero to signal active I/O shutdown failure. All other
1541 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1542 * but still return zero here.
1543 *
1544 * This may only be called from process context, and also currently
1545 * assumes internal allocation of fabric payload buffer by target-core.
1546 *
1547 * It also assumes interal target core SGL memory allocation.
1548 */
1549int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1550 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1551 u32 data_length, int task_attr, int data_dir, int flags)
1552{
1553 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1554 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1555 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1556}
a6360785
NB		 1557EXPORT_SYMBOL(target_submit_cmd);
1558
9f0d05c2
NB		 1559static void target_complete_tmr_failure(struct work_struct *work)
1560{
1561 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1562
1563 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1564 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1565
1566 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1567}
1568
ea98d7f9
AG		 1569/**
1570 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1571 * for TMR CDBs
1572 *
1573 * @se_cmd: command descriptor to submit
1574 * @se_sess: associated se_sess for endpoint
1575 * @sense: pointer to SCSI sense buffer
1576 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1577 * @fabric_context: fabric context for TMR req
1578 * @tm_type: Type of TM request
c0974f89
NB		 1579 * @gfp: gfp type for caller
1580 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1581 * @flags: submit cmd flags
ea98d7f9
AG		 1582 *
1583 * Callable from all contexts.
1584 **/
1585
c7042cae 1586int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1587 unsigned char *sense, u64 unpacked_lun,
c0974f89 1588 void *fabric_tmr_ptr, unsigned char tm_type,
5261d86c 1589 gfp_t gfp, u64 tag, int flags)
ea98d7f9
AG		 1590{
1591 struct se_portal_group *se_tpg;
1592 int ret;
1593
1594 se_tpg = se_sess->se_tpg;
1595 BUG_ON(!se_tpg);
1596
1597 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1598 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1599 /*
1600 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1601 * allocation failure.
1602 */
c0974f89 1603 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1604 if (ret < 0)
1605 return -ENOMEM;
ea98d7f9 1606
c0974f89
NB		 1607 if (tm_type == TMR_ABORT_TASK)
1608 se_cmd->se_tmr_req->ref_task_tag = tag;
1609
ea98d7f9 1610 /* See target_submit_cmd for commentary */
afc16604 1611 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1612 if (ret) {
1613 core_tmr_release_req(se_cmd->se_tmr_req);
1614 return ret;
1615 }
ea98d7f9 1616
ea98d7f9
AG		 1617 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1618 if (ret) {
9f0d05c2
NB		 1619 /*
1620 * For callback during failure handling, push this work off
1621 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1622 */
1623 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1624 schedule_work(&se_cmd->work);
c7042cae 1625 return 0;
ea98d7f9
AG		 1626 }
1627 transport_generic_handle_tmr(se_cmd);
c7042cae 1628 return 0;
ea98d7f9
AG		 1629}
1630EXPORT_SYMBOL(target_submit_tmr);
1631
c66ac9db
NB		 1632/*
1633 * Handle SAM-esque emulation for generic transport request failures.
1634 */
de103c93
CH		 1635void transport_generic_request_failure(struct se_cmd *cmd,
1636 sense_reason_t sense_reason)
c66ac9db 1637{
057085e5 1638 int ret = 0, post_ret = 0;
07bde79a 1639
649ee054
BVA		 1640 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1641 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1642 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1643 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1644 cmd->t_state, sense_reason);
d43d6aea 1645 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1646 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1647 (cmd->transport_state & CMD_T_STOP) != 0,
1648 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1649
c66ac9db
NB		 1650 /*
1651 * For SAM Task Attribute emulation for failed struct se_cmd
1652 */
019c4ca6 1653 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1654 /*
1655 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1656 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1657 */
1658 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1659 cmd->transport_complete_callback)
057085e5 1660 cmd->transport_complete_callback(cmd, false, &post_ret);
c66ac9db 1661
de103c93 1662 switch (sense_reason) {
03e98c9e
NB		 1663 case TCM_NON_EXISTENT_LUN:
1664 case TCM_UNSUPPORTED_SCSI_OPCODE:
1665 case TCM_INVALID_CDB_FIELD:
1666 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1667 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1668 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1669 case TCM_UNKNOWN_MODE_PAGE:
1670 case TCM_WRITE_PROTECTED:
e2397c70 1671 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1672 case TCM_CHECK_CONDITION_ABORT_CMD:
1673 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1674 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1675 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1676 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1677 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1678 break;
de103c93
CH		 1679 case TCM_OUT_OF_RESOURCES:
1680 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1681 break;
03e98c9e 1682 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1683 /*
1684 * No SENSE Data payload for this case, set SCSI Status
1685 * and queue the response to $FABRIC_MOD.
1686 *
1687 * Uses linux/include/scsi/scsi.h SAM status codes defs
1688 */
1689 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1690 /*
1691 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1692 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1693 * CONFLICT STATUS.
1694 *
1695 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1696 */
e3d6f909 1697 if (cmd->se_sess &&
c51c8e7b
HR		 1698 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1699 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1700 cmd->orig_fe_lun, 0x2C,
1701 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1702 }
e5c0d6ad 1703 trace_target_cmd_complete(cmd);
c51c8e7b 1704 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1705 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1706 goto queue_full;
c66ac9db 1707 goto check_stop;
c66ac9db 1708 default:
6708bb27 1709 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1710 cmd->t_task_cdb[0], sense_reason);
1711 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1712 break;
1713 }
f3146437 1714
de103c93 1715 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1716 if (ret == -EAGAIN || ret == -ENOMEM)
1717 goto queue_full;
07bde79a 1718
c66ac9db
NB		 1719check_stop:
1720 transport_lun_remove_cmd(cmd);
06b967e4 1721 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1722 return;
1723
1724queue_full:
e057f533
CH		 1725 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1726 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1727}
2fbff127 1728EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1729
76dde50e 1730void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1731{
de103c93 1732 sense_reason_t ret;
5f41a31d 1733
de103c93
CH		 1734 if (cmd->execute_cmd) {
1735 ret = cmd->execute_cmd(cmd);
1736 if (ret) {
1737 spin_lock_irq(&cmd->t_state_lock);
1738 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1739 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1740
de103c93
CH		 1741 transport_generic_request_failure(cmd, ret);
1742 }
5f41a31d
CH		 1743 }
1744}
1745
aa58b531
NB		 1746static int target_write_prot_action(struct se_cmd *cmd)
1747{
5132d1e6 1748 u32 sectors;
aa58b531
NB		 1749 /*
1750 * Perform WRITE_INSERT of PI using software emulation when backend
1751 * device has PI enabled, if the transport has not already generated
1752 * PI using hardware WRITE_INSERT offload.
1753 */
1754 switch (cmd->prot_op) {
1755 case TARGET_PROT_DOUT_INSERT:
1756 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1757 sbc_dif_generate(cmd);
1758 break;
5132d1e6
NB		 1759 case TARGET_PROT_DOUT_STRIP:
1760 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1761 break;
1762
1763 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1764 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1765 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1766 if (unlikely(cmd->pi_err)) {
1767 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1768 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1769 spin_unlock_irq(&cmd->t_state_lock);
1770 transport_generic_request_failure(cmd, cmd->pi_err);
1771 return -1;
1772 }
1773 break;
aa58b531
NB		 1774 default:
1775 break;
1776 }
1777
1778 return 0;
1779}
1780
019c4ca6 1781static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1782{
1783 struct se_device *dev = cmd->se_dev;
1784
a3541703 1785 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1786 return false;
5f41a31d 1787
c66ac9db 1788 /*
25985edc 1789 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1790 * to allow the passed struct se_cmd list of tasks to the front of the list.
1791 */
5f41a31d 1792 switch (cmd->sam_task_attr) {
68d81f40 1793 case TCM_HEAD_TAG:
9c31820b
RD		 1794 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1795 cmd->t_task_cdb[0]);
019c4ca6 1796 return false;
68d81f40 1797 case TCM_ORDERED_TAG:
33940d09 1798 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1799
9c31820b
RD		 1800 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1801 cmd->t_task_cdb[0]);
5f41a31d 1802
c66ac9db 1803 /*
5f41a31d
CH		 1804 * Execute an ORDERED command if no other older commands
1805 * exist that need to be completed first.
c66ac9db 1806 */
5f41a31d 1807 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1808 return false;
5f41a31d
CH		 1809 break;
1810 default:
c66ac9db
NB		 1811 /*
1812 * For SIMPLE and UNTAGGED Task Attribute commands
1813 */
33940d09 1814 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1815 break;
c66ac9db 1816 }
5f41a31d 1817
019c4ca6
CH		 1818 if (atomic_read(&dev->dev_ordered_sync) == 0)
1819 return false;
c66ac9db 1820
019c4ca6
CH		 1821 spin_lock(&dev->delayed_cmd_lock);
1822 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1823 spin_unlock(&dev->delayed_cmd_lock);
1824
9c31820b
RD		 1825 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1826 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1827 return true;
1828}
1829
310d3d31
NB		 1830static int __transport_check_aborted_status(struct se_cmd *, int);
1831
019c4ca6
CH		 1832void target_execute_cmd(struct se_cmd *cmd)
1833{
019c4ca6
CH		 1834 /*
1835 * Determine if frontend context caller is requesting the stopping of
1836 * this command for frontend exceptions.
310d3d31
NB		 1837 *
1838 * If the received CDB has aleady been aborted stop processing it here.
019c4ca6 1839 */
4a9a6c8d 1840 spin_lock_irq(&cmd->t_state_lock);
310d3d31
NB		 1841 if (__transport_check_aborted_status(cmd, 1)) {
1842 spin_unlock_irq(&cmd->t_state_lock);
1843 return;
1844 }
019c4ca6 1845 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1846 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1847 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1848
1849 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1850 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1851 return;
1852 }
1853
1854 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1855 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1856 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1857
1858 if (target_write_prot_action(cmd))
1859 return;
019c4ca6 1860
1a398b97
NB		 1861 if (target_handle_task_attr(cmd)) {
1862 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1863 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1864 spin_unlock_irq(&cmd->t_state_lock);
1865 return;
1866 }
1867
1868 __target_execute_cmd(cmd);
c66ac9db 1869}
70baf0ab 1870EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1871
5f41a31d
CH		 1872/*
1873 * Process all commands up to the last received ORDERED task attribute which
1874 * requires another blocking boundary
1875 */
1876static void target_restart_delayed_cmds(struct se_device *dev)
1877{
1878 for (;;) {
1879 struct se_cmd *cmd;
1880
1881 spin_lock(&dev->delayed_cmd_lock);
1882 if (list_empty(&dev->delayed_cmd_list)) {
1883 spin_unlock(&dev->delayed_cmd_lock);
1884 break;
1885 }
1886
1887 cmd = list_entry(dev->delayed_cmd_list.next,
1888 struct se_cmd, se_delayed_node);
1889 list_del(&cmd->se_delayed_node);
1890 spin_unlock(&dev->delayed_cmd_lock);
1891
1892 __target_execute_cmd(cmd);
1893
68d81f40 1894 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1895 break;
1896 }
1897}
1898
c66ac9db 1899/*
35e0e757 1900 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1901 * and ordered cmds need to have their tasks added to the execution queue.
1902 */
1903static void transport_complete_task_attr(struct se_cmd *cmd)
1904{
5951146d 1905 struct se_device *dev = cmd->se_dev;
c66ac9db 1906
a3541703 1907 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1908 return;
1909
68d81f40 1910 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1911 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1912 dev->dev_cur_ordered_id++;
9c31820b
RD		 1913 pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
1914 dev->dev_cur_ordered_id);
68d81f40 1915 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1916 dev->dev_cur_ordered_id++;
9c31820b
RD		 1917 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1918 dev->dev_cur_ordered_id);
68d81f40 1919 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1920 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1921
1922 dev->dev_cur_ordered_id++;
9c31820b
RD		 1923 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1924 dev->dev_cur_ordered_id);
c66ac9db 1925 }
c66ac9db 1926
5f41a31d 1927 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1928}
1929
e057f533 1930static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1931{
1932 int ret = 0;
1933
019c4ca6 1934 transport_complete_task_attr(cmd);
e057f533
CH		 1935
1936 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1937 trace_target_cmd_complete(cmd);
e057f533 1938 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1939 goto out;
e057f533 1940 }
07bde79a
NB		 1941
1942 switch (cmd->data_direction) {
1943 case DMA_FROM_DEVICE:
e5c0d6ad 1944 trace_target_cmd_complete(cmd);
07bde79a
NB		 1945 ret = cmd->se_tfo->queue_data_in(cmd);
1946 break;
1947 case DMA_TO_DEVICE:
64577407 1948 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1949 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 1950 break;
07bde79a
NB		 1951 }
1952 /* Fall through for DMA_TO_DEVICE */
1953 case DMA_NONE:
e5c0d6ad 1954 trace_target_cmd_complete(cmd);
07bde79a
NB		 1955 ret = cmd->se_tfo->queue_status(cmd);
1956 break;
1957 default:
1958 break;
1959 }
1960
e057f533
CH		 1961out:
1962 if (ret < 0) {
1963 transport_handle_queue_full(cmd, cmd->se_dev);
1964 return;
1965 }
1966 transport_lun_remove_cmd(cmd);
1967 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1968}
1969
1970static void transport_handle_queue_full(
1971 struct se_cmd *cmd,
e057f533 1972 struct se_device *dev)
07bde79a
NB		 1973{
1974 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 1975 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 1976 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 1977 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1978
1979 schedule_work(&cmd->se_dev->qf_work_queue);
1980}
1981
fdeab852 1982static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 1983{
fdeab852
NB		 1984 switch (cmd->prot_op) {
1985 case TARGET_PROT_DIN_STRIP:
1986 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 1987 u32 sectors = cmd->data_length >>
1988 ilog2(cmd->se_dev->dev_attrib.block_size);
1989
1990 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1991 sectors, 0, cmd->t_prot_sg,
1992 0);
1993 if (cmd->pi_err)
fdeab852 1994 return true;
bc005869 1995 }
fdeab852 1996 break;
72c03850
NB		 1997 case TARGET_PROT_DIN_INSERT:
1998 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
1999 break;
2000
2001 sbc_dif_generate(cmd);
2002 break;
fdeab852
NB		 2003 default:
2004 break;
bc005869
NB		 2005 }
2006
2007 return false;
2008}
2009
35e0e757 2010static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2011{
35e0e757 2012 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2013 int ret;
35e0e757 2014
c66ac9db
NB		 2015 /*
2016 * Check if we need to move delayed/dormant tasks from cmds on the
2017 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2018 * Attribute.
2019 */
019c4ca6
CH		 2020 transport_complete_task_attr(cmd);
2021
07bde79a
NB		 2022 /*
2023 * Check to schedule QUEUE_FULL work, or execute an existing
2024 * cmd->transport_qf_callback()
2025 */
2026 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2027 schedule_work(&cmd->se_dev->qf_work_queue);
2028
c66ac9db 2029 /*
d5829eac 2030 * Check if we need to send a sense buffer from
c66ac9db
NB		 2031 * the struct se_cmd in question.
2032 */
2033 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2034 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2035 ret = transport_send_check_condition_and_sense(
2036 cmd, 0, 1);
2037 if (ret == -EAGAIN || ret == -ENOMEM)
2038 goto queue_full;
2039
2040 transport_lun_remove_cmd(cmd);
2041 transport_cmd_check_stop_to_fabric(cmd);
2042 return;
c66ac9db
NB		 2043 }
2044 /*
25985edc 2045 * Check for a callback, used by amongst other things
a6b0133c 2046 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2047 */
a6b0133c
NB		 2048 if (cmd->transport_complete_callback) {
2049 sense_reason_t rc;
057085e5
NB		 2050 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2051 bool zero_dl = !(cmd->data_length);
2052 int post_ret = 0;
a6b0133c 2053
057085e5
NB		 2054 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2055 if (!rc && !post_ret) {
2056 if (caw && zero_dl)
c8e63985
NB		 2057 goto queue_rsp;
2058
a6b0133c 2059 return;
a2890087
NB		 2060 } else if (rc) {
2061 ret = transport_send_check_condition_and_sense(cmd,
2062 rc, 0);
2063 if (ret == -EAGAIN || ret == -ENOMEM)
2064 goto queue_full;
a6b0133c 2065
a2890087
NB		 2066 transport_lun_remove_cmd(cmd);
2067 transport_cmd_check_stop_to_fabric(cmd);
2068 return;
2069 }
a6b0133c 2070 }
c66ac9db 2071
c8e63985 2072queue_rsp:
c66ac9db
NB		 2073 switch (cmd->data_direction) {
2074 case DMA_FROM_DEVICE:
4cc987ea
NB		 2075 atomic_long_add(cmd->data_length,
2076 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2077 /*
2078 * Perform READ_STRIP of PI using software emulation when
2079 * backend had PI enabled, if the transport will not be
2080 * performing hardware READ_STRIP offload.
2081 */
fdeab852 2082 if (target_read_prot_action(cmd)) {
bc005869
NB		 2083 ret = transport_send_check_condition_and_sense(cmd,
2084 cmd->pi_err, 0);
2085 if (ret == -EAGAIN || ret == -ENOMEM)
2086 goto queue_full;
2087
2088 transport_lun_remove_cmd(cmd);
2089 transport_cmd_check_stop_to_fabric(cmd);
2090 return;
2091 }
c66ac9db 2092
e5c0d6ad 2093 trace_target_cmd_complete(cmd);
07bde79a 2094 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2095 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2096 goto queue_full;
c66ac9db
NB		 2097 break;
2098 case DMA_TO_DEVICE:
4cc987ea
NB		 2099 atomic_long_add(cmd->data_length,
2100 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2101 /*
2102 * Check if we need to send READ payload for BIDI-COMMAND
2103 */
64577407 2104 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2105 atomic_long_add(cmd->data_length,
2106 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2107 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2108 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2109 goto queue_full;
c66ac9db
NB		 2110 break;
2111 }
2112 /* Fall through for DMA_TO_DEVICE */
2113 case DMA_NONE:
e5c0d6ad 2114 trace_target_cmd_complete(cmd);
07bde79a 2115 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2116 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2117 goto queue_full;
c66ac9db
NB		 2118 break;
2119 default:
2120 break;
2121 }
2122
2123 transport_lun_remove_cmd(cmd);
2124 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2125 return;
2126
2127queue_full:
6708bb27 2128 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2129 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2130 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2131 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2132}
2133
6708bb27 2134static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2135{
ec98f782 2136 struct scatterlist *sg;
ec98f782 2137 int count;
c66ac9db 2138
6708bb27
AG		 2139 for_each_sg(sgl, sg, nents, count)
2140 __free_page(sg_page(sg));
c66ac9db 2141
6708bb27
AG		 2142 kfree(sgl);
2143}
c66ac9db 2144
47e459e6
NB		 2145static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2146{
2147 /*
2148 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2149 * emulation, and free + reset pointers if necessary..
2150 */
2151 if (!cmd->t_data_sg_orig)
2152 return;
2153
2154 kfree(cmd->t_data_sg);
2155 cmd->t_data_sg = cmd->t_data_sg_orig;
2156 cmd->t_data_sg_orig = NULL;
2157 cmd->t_data_nents = cmd->t_data_nents_orig;
2158 cmd->t_data_nents_orig = 0;
2159}
2160
6708bb27
AG		 2161static inline void transport_free_pages(struct se_cmd *cmd)
2162{
5835812f
AM		 2163 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2164 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2165 cmd->t_prot_sg = NULL;
2166 cmd->t_prot_nents = 0;
2167 }
2168
47e459e6 2169 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2170 /*
2171 * Release special case READ buffer payload required for
2172 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2173 */
2174 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2175 transport_free_sgl(cmd->t_bidi_data_sg,
2176 cmd->t_bidi_data_nents);
2177 cmd->t_bidi_data_sg = NULL;
2178 cmd->t_bidi_data_nents = 0;
2179 }
47e459e6 2180 transport_reset_sgl_orig(cmd);
6708bb27 2181 return;
47e459e6
NB		 2182 }
2183 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2184
2185 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2186 cmd->t_data_sg = NULL;
2187 cmd->t_data_nents = 0;
c66ac9db 2188
6708bb27 2189 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2190 cmd->t_bidi_data_sg = NULL;
2191 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2192}
2193
e26d99ae 2194/**
febe562c
NB		 2195 * transport_put_cmd - release a reference to a command
2196 * @cmd: command to release
e26d99ae 2197 *
febe562c 2198 * This routine releases our reference to the command and frees it if possible.
e26d99ae 2199 */
febe562c 2200static int transport_put_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2201{
2202 BUG_ON(!cmd->se_tfo);
e26d99ae 2203 /*
7481deb4
NB		 2204 * If this cmd has been setup with target_get_sess_cmd(), drop
2205 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2206 */
afc16604 2207 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2208}
2209
4949314c 2210void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2211{
ec98f782 2212 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2213 struct page **pages;
2214 int i;
05d1c7c0
AG		 2215
2216 /*
ec98f782
AG		 2217 * We need to take into account a possible offset here for fabrics like
2218 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2219 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2220 */
4949314c
AG		 2221 if (!cmd->t_data_nents)
2222 return NULL;
3717ef0c
PB		 2223
2224 BUG_ON(!sg);
2225 if (cmd->t_data_nents == 1)
4949314c
AG		 2226 return kmap(sg_page(sg)) + sg->offset;
2227
2228 /* >1 page. use vmap */
2229 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2230 if (!pages)
4949314c
AG		 2231 return NULL;
2232
2233 /* convert sg[] to pages[] */
2234 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2235 pages[i] = sg_page(sg);
2236 }
2237
2238 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2239 kfree(pages);
de103c93 2240 if (!cmd->t_data_vmap)
4949314c
AG		 2241 return NULL;
2242
2243 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2244}
4949314c 2245EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2246
4949314c 2247void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2248{
a1edf9cf 2249 if (!cmd->t_data_nents) {
4949314c 2250 return;
a1edf9cf 2251 } else if (cmd->t_data_nents == 1) {
4949314c 2252 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2253 return;
2254 }
4949314c
AG		 2255
2256 vunmap(cmd->t_data_vmap);
2257 cmd->t_data_vmap = NULL;
05d1c7c0 2258}
4949314c 2259EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2260
c5ff8d6b 2261int
20093994
NB		 2262target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2263 bool zero_page)
c66ac9db 2264{
20093994 2265 struct scatterlist *sg;
ec98f782 2266 struct page *page;
20093994
NB		 2267 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2268 unsigned int nent;
ec98f782 2269 int i = 0;
c66ac9db 2270
20093994
NB		 2271 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2272 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2273 if (!sg)
ec98f782 2274 return -ENOMEM;
c66ac9db 2275
20093994 2276 sg_init_table(sg, nent);
9db9da33 2277
ec98f782
AG		 2278 while (length) {
2279 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2280 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2281 if (!page)
2282 goto out;
c66ac9db 2283
20093994 2284 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2285 length -= page_len;
2286 i++;
c66ac9db 2287 }
20093994
NB		 2288 *sgl = sg;
2289 *nents = nent;
c66ac9db 2290 return 0;
c66ac9db 2291
ec98f782 2292out:
d0e27c88 2293 while (i > 0) {
ec98f782 2294 i--;
20093994 2295 __free_page(sg_page(&sg[i]));
c66ac9db 2296 }
20093994 2297 kfree(sg);
ec98f782 2298 return -ENOMEM;
c66ac9db
NB		 2299}
2300
da0f7619 2301/*
b16a35b0
AG		 2302 * Allocate any required resources to execute the command. For writes we
2303 * might not have the payload yet, so notify the fabric via a call to
2304 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2305 */
de103c93
CH		 2306sense_reason_t
2307transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2308{
c66ac9db 2309 int ret = 0;
c8e63985 2310 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2311
5835812f
AM		 2312 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2313 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2314 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2315 cmd->prot_length, true);
2316 if (ret < 0)
2317 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2318 }
2319
c66ac9db
NB		 2320 /*
2321 * Determine is the TCM fabric module has already allocated physical
2322 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2323 * beforehand.
c66ac9db 2324 */
ec98f782
AG		 2325 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2326 cmd->data_length) {
20093994 2327
8cefe07b
NB		 2328 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2329 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2330 u32 bidi_length;
2331
2332 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2333 bidi_length = cmd->t_task_nolb *
2334 cmd->se_dev->dev_attrib.block_size;
2335 else
2336 bidi_length = cmd->data_length;
2337
2338 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2339 &cmd->t_bidi_data_nents,
2340 bidi_length, zero_flag);
2341 if (ret < 0)
2342 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2343 }
2344
20093994
NB		 2345 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2346 cmd->data_length, zero_flag);
c66ac9db 2347 if (ret < 0)
de103c93 2348 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2349 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2350 cmd->data_length) {
2351 /*
2352 * Special case for COMPARE_AND_WRITE with fabrics
2353 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2354 */
2355 u32 caw_length = cmd->t_task_nolb *
2356 cmd->se_dev->dev_attrib.block_size;
2357
2358 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2359 &cmd->t_bidi_data_nents,
2360 caw_length, zero_flag);
2361 if (ret < 0)
2362 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2363 }
c66ac9db 2364 /*
c3196f0c
CH		 2365 * If this command is not a write we can execute it right here,
2366 * for write buffers we need to notify the fabric driver first
2367 * and let it call back once the write buffers are ready.
c66ac9db 2368 */
5f41a31d 2369 target_add_to_state_list(cmd);
885e7b0e 2370 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2371 target_execute_cmd(cmd);
2372 return 0;
2373 }
862e6389 2374 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2375
2376 ret = cmd->se_tfo->write_pending(cmd);
2377 if (ret == -EAGAIN || ret == -ENOMEM)
2378 goto queue_full;
2379
de103c93
CH		 2380 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2381 WARN_ON(ret);
2382
b69c1fcf 2383 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2384
c3196f0c
CH		 2385queue_full:
2386 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2387 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2388 transport_handle_queue_full(cmd, cmd->se_dev);
2389 return 0;
c66ac9db 2390}
a1d8b49a 2391EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2392
e057f533 2393static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2394{
f147abb4
NB		 2395 int ret;
2396
2397 ret = cmd->se_tfo->write_pending(cmd);
2398 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2399 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2400 cmd);
2401 transport_handle_queue_full(cmd, cmd->se_dev);
2402 }
07bde79a
NB		 2403}
2404
0f4a9431
NB		 2405static bool
2406__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2407 unsigned long *flags);
2408
2409static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2410{
2411 unsigned long flags;
2412
2413 spin_lock_irqsave(&cmd->t_state_lock, flags);
2414 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2415 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2416}
2417
d5ddad41 2418int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2419{
d5ddad41 2420 int ret = 0;
0f4a9431 2421 bool aborted = false, tas = false;
d5ddad41 2422
d14921d6 2423 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2424 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
0f4a9431 2425 target_wait_free_cmd(cmd, &aborted, &tas);
d14921d6 2426
0f4a9431
NB		 2427 if (!aborted || tas)
2428 ret = transport_put_cmd(cmd);
d14921d6
NB		 2429 } else {
2430 if (wait_for_tasks)
0f4a9431 2431 target_wait_free_cmd(cmd, &aborted, &tas);
c130480b
NB		 2432 /*
2433 * Handle WRITE failure case where transport_generic_new_cmd()
2434 * has already added se_cmd to state_list, but fabric has
2435 * failed command before I/O submission.
2436 */
febe562c 2437 if (cmd->state_active)
c130480b 2438 target_remove_from_state_list(cmd);
d14921d6 2439
82f1c8a4 2440 if (cmd->se_lun)
c66ac9db 2441 transport_lun_remove_cmd(cmd);
c66ac9db 2442
0f4a9431
NB		 2443 if (!aborted || tas)
2444 ret = transport_put_cmd(cmd);
2445 }
2446 /*
2447 * If the task has been internally aborted due to TMR ABORT_TASK
2448 * or LUN_RESET, target_core_tmr.c is responsible for performing
2449 * the remaining calls to target_put_sess_cmd(), and not the
2450 * callers of this function.
2451 */
2452 if (aborted) {
2453 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2454 wait_for_completion(&cmd->cmd_wait_comp);
2455 cmd->se_tfo->release_cmd(cmd);
2456 ret = 1;
c66ac9db 2457 }
d5ddad41 2458 return ret;
c66ac9db
NB		 2459}
2460EXPORT_SYMBOL(transport_generic_free_cmd);
2461
a17f091d 2462/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2463 * @se_cmd: command descriptor to add
a6360785 2464 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2465 */
afc16604 2466int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2467{
afc16604 2468 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2469 unsigned long flags;
bc187ea6 2470 int ret = 0;
a17f091d 2471
a6360785
NB		 2472 /*
2473 * Add a second kref if the fabric caller is expecting to handle
2474 * fabric acknowledgement that requires two target_put_sess_cmd()
2475 * invocations before se_cmd descriptor release.
2476 */
054922bb 2477 if (ack_kref)
a6360785 2478 kref_get(&se_cmd->cmd_kref);
7481deb4 2479
a17f091d 2480 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2481 if (se_sess->sess_tearing_down) {
2482 ret = -ESHUTDOWN;
2483 goto out;
2484 }
a17f091d 2485 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2486out:
a17f091d 2487 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2488
2489 if (ret && ack_kref)
afc16604 2490 target_put_sess_cmd(se_cmd);
7544e597 2491
bc187ea6 2492 return ret;
a17f091d 2493}
20361e69 2494EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2495
febe562c
NB		 2496static void target_free_cmd_mem(struct se_cmd *cmd)
2497{
2498 transport_free_pages(cmd);
2499
2500 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2501 core_tmr_release_req(cmd->se_tmr_req);
2502 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2503 kfree(cmd->t_task_cdb);
2504}
2505
7481deb4 2506static void target_release_cmd_kref(struct kref *kref)
a17f091d 2507{
7481deb4
NB		 2508 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2509 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2510 unsigned long flags;
0f4a9431 2511 bool fabric_stop;
a17f091d 2512
9ff9d15e 2513 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
a17f091d 2514 if (list_empty(&se_cmd->se_cmd_list)) {
9ff9d15e 2515 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
febe562c 2516 target_free_cmd_mem(se_cmd);
ffc32d52 2517 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2518 return;
a17f091d 2519 }
0f4a9431
NB		 2520
2521 spin_lock(&se_cmd->t_state_lock);
2522 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP);
2523 spin_unlock(&se_cmd->t_state_lock);
2524
2525 if (se_cmd->cmd_wait_set || fabric_stop) {
2526 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2527 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
febe562c 2528 target_free_cmd_mem(se_cmd);
a17f091d 2529 complete(&se_cmd->cmd_wait_comp);
7481deb4 2530 return;
a17f091d 2531 }
0f4a9431 2532 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2533 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2534
febe562c 2535 target_free_cmd_mem(se_cmd);
7481deb4
NB		 2536 se_cmd->se_tfo->release_cmd(se_cmd);
2537}
2538
2539/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2540 * @se_cmd: command descriptor to drop
2541 */
afc16604 2542int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2543{
afc16604
BVA		 2544 struct se_session *se_sess = se_cmd->se_sess;
2545
0ed6e189 2546 if (!se_sess) {
febe562c 2547 target_free_cmd_mem(se_cmd);
0ed6e189
NB		 2548 se_cmd->se_tfo->release_cmd(se_cmd);
2549 return 1;
2550 }
9ff9d15e 2551 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2552}
2553EXPORT_SYMBOL(target_put_sess_cmd);
2554
1c7b13fe
RD		 2555/* target_sess_cmd_list_set_waiting - Flag all commands in
2556 * sess_cmd_list to complete cmd_wait_comp. Set
2557 * sess_tearing_down so no more commands are queued.
2558 * @se_sess: session to flag
a17f091d 2559 */
1c7b13fe 2560void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2561{
2562 struct se_cmd *se_cmd;
2563 unsigned long flags;
0f4a9431 2564 int rc;
a17f091d 2565
a17f091d 2566 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2567 if (se_sess->sess_tearing_down) {
2568 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2569 return;
2570 }
1c7b13fe 2571 se_sess->sess_tearing_down = 1;
9b31a328 2572 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2573
0f4a9431
NB		 2574 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) {
2575 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2576 if (rc) {
2577 se_cmd->cmd_wait_set = 1;
2578 spin_lock(&se_cmd->t_state_lock);
2579 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2580 spin_unlock(&se_cmd->t_state_lock);
2581 }
2582 }
a17f091d
NB		 2583
2584 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2585}
1c7b13fe 2586EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2587
2588/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2589 * @se_sess: session to wait for active I/O
a17f091d 2590 */
be646c2d 2591void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2592{
2593 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2594 unsigned long flags;
0f4a9431 2595 bool tas;
a17f091d
NB		 2596
2597 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2598 &se_sess->sess_wait_list, se_cmd_list) {
0f4a9431 2599 list_del_init(&se_cmd->se_cmd_list);
a17f091d
NB		 2600
2601 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2602 " %d\n", se_cmd, se_cmd->t_state,
2603 se_cmd->se_tfo->get_cmd_state(se_cmd));
2604
0f4a9431
NB		 2605 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2606 tas = (se_cmd->transport_state & CMD_T_TAS);
2607 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2608
2609 if (!target_put_sess_cmd(se_cmd)) {
2610 if (tas)
2611 target_put_sess_cmd(se_cmd);
2612 }
2613
be646c2d
JE		 2614 wait_for_completion(&se_cmd->cmd_wait_comp);
2615 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2616 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2617 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2618
2619 se_cmd->se_tfo->release_cmd(se_cmd);
2620 }
9b31a328
NB		 2621
2622 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2623 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2624 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2625
a17f091d
NB		 2626}
2627EXPORT_SYMBOL(target_wait_for_sess_cmds);
2628
b3eeea66 2629void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2630{
5277797d 2631 percpu_ref_kill(&lun->lun_ref);
5277797d 2632 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2633}
2634
0f4a9431
NB		 2635static bool
2636__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2637 bool *aborted, bool *tas, unsigned long *flags)
2638 __releases(&cmd->t_state_lock)
2639 __acquires(&cmd->t_state_lock)
c66ac9db 2640{
c66ac9db 2641
0f4a9431
NB		 2642 assert_spin_locked(&cmd->t_state_lock);
2643 WARN_ON_ONCE(!irqs_disabled());
2644
2645 if (fabric_stop)
2646 cmd->transport_state |= CMD_T_FABRIC_STOP;
2647
2648 if (cmd->transport_state & CMD_T_ABORTED)
2649 *aborted = true;
2650
2651 if (cmd->transport_state & CMD_T_TAS)
2652 *tas = true;
2653
c8e31f26 2654 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
0f4a9431 2655 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2656 return false;
cb4f4d3c 2657
c8e31f26 2658 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
0f4a9431 2659 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2660 return false;
7d680f3b 2661
0f4a9431
NB		 2662 if (!(cmd->transport_state & CMD_T_ACTIVE))
2663 return false;
2664
2665 if (fabric_stop && *aborted)
a17f091d 2666 return false;
c66ac9db 2667
7d680f3b 2668 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2669
0f4a9431
NB		 2670 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2671 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2672 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2673
0f4a9431 2674 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db 2675
a1d8b49a 2676 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2677
0f4a9431 2678 spin_lock_irqsave(&cmd->t_state_lock, *flags);
7d680f3b 2679 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2680
0f4a9431
NB		 2681 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2682 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
c66ac9db 2683
0f4a9431
NB		 2684 return true;
2685}
2686
2687/**
2688 * transport_wait_for_tasks - wait for completion to occur
2689 * @cmd: command to wait
2690 *
2691 * Called from frontend fabric context to wait for storage engine
2692 * to pause and/or release frontend generated struct se_cmd.
2693 */
2694bool transport_wait_for_tasks(struct se_cmd *cmd)
2695{
2696 unsigned long flags;
2697 bool ret, aborted = false, tas = false;
2698
2699 spin_lock_irqsave(&cmd->t_state_lock, flags);
2700 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
d14921d6 2701 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2702
0f4a9431 2703 return ret;
c66ac9db 2704}
d14921d6 2705EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2706
ab78fef4
BVA		 2707struct sense_info {
2708 u8 key;
2709 u8 asc;
2710 u8 ascq;
2711 bool add_sector_info;
2712};
2713
2714static const struct sense_info sense_info_table[] = {
2715 [TCM_NO_SENSE] = {
2716 .key = NOT_READY
2717 },
2718 [TCM_NON_EXISTENT_LUN] = {
2719 .key = ILLEGAL_REQUEST,
2720 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2721 },
2722 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2723 .key = ILLEGAL_REQUEST,
2724 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2725 },
2726 [TCM_SECTOR_COUNT_TOO_MANY] = {
2727 .key = ILLEGAL_REQUEST,
2728 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2729 },
2730 [TCM_UNKNOWN_MODE_PAGE] = {
2731 .key = ILLEGAL_REQUEST,
2732 .asc = 0x24, /* INVALID FIELD IN CDB */
2733 },
2734 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2735 .key = ABORTED_COMMAND,
2736 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2737 .ascq = 0x03,
2738 },
2739 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2740 .key = ABORTED_COMMAND,
2741 .asc = 0x0c, /* WRITE ERROR */
2742 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2743 },
2744 [TCM_INVALID_CDB_FIELD] = {
2745 .key = ILLEGAL_REQUEST,
2746 .asc = 0x24, /* INVALID FIELD IN CDB */
2747 },
2748 [TCM_INVALID_PARAMETER_LIST] = {
2749 .key = ILLEGAL_REQUEST,
2750 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2751 },
2752 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2753 .key = ILLEGAL_REQUEST,
2754 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2755 },
2756 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2757 .key = ILLEGAL_REQUEST,
2758 .asc = 0x0c, /* WRITE ERROR */
2759 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2760 },
2761 [TCM_SERVICE_CRC_ERROR] = {
2762 .key = ABORTED_COMMAND,
2763 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2764 .ascq = 0x05, /* N/A */
2765 },
2766 [TCM_SNACK_REJECTED] = {
2767 .key = ABORTED_COMMAND,
2768 .asc = 0x11, /* READ ERROR */
2769 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2770 },
2771 [TCM_WRITE_PROTECTED] = {
2772 .key = DATA_PROTECT,
2773 .asc = 0x27, /* WRITE PROTECTED */
2774 },
2775 [TCM_ADDRESS_OUT_OF_RANGE] = {
2776 .key = ILLEGAL_REQUEST,
2777 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2778 },
2779 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2780 .key = UNIT_ATTENTION,
2781 },
2782 [TCM_CHECK_CONDITION_NOT_READY] = {
2783 .key = NOT_READY,
2784 },
2785 [TCM_MISCOMPARE_VERIFY] = {
2786 .key = MISCOMPARE,
2787 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2788 .ascq = 0x00,
2789 },
2790 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2791 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2792 .asc = 0x10,
2793 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2794 .add_sector_info = true,
2795 },
2796 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2797 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2798 .asc = 0x10,
2799 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2800 .add_sector_info = true,
2801 },
2802 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2803 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2804 .asc = 0x10,
2805 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2806 .add_sector_info = true,
2807 },
2808 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2809 /*
2810 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2811 * Solaris initiators. Returning NOT READY instead means the
2812 * operations will be retried a finite number of times and we
2813 * can survive intermittent errors.
2814 */
2815 .key = NOT_READY,
2816 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2817 },
2818};
2819
f5a8b3a7 2820static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2821{
2822 const struct sense_info *si;
2823 u8 *buffer = cmd->sense_buffer;
2824 int r = (__force int)reason;
2825 u8 asc, ascq;
4e4937e8 2826 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 2827
2828 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2829 si = &sense_info_table[r];
2830 else
2831 si = &sense_info_table[(__force int)
2832 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2833
ab78fef4
BVA		 2834 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2835 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2836 WARN_ON_ONCE(asc == 0);
2837 } else if (si->asc == 0) {
2838 WARN_ON_ONCE(cmd->scsi_asc == 0);
2839 asc = cmd->scsi_asc;
2840 ascq = cmd->scsi_ascq;
2841 } else {
2842 asc = si->asc;
2843 ascq = si->ascq;
2844 }
9ec1e1ce 2845
4e4937e8 2846 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 2847 if (si->add_sector_info)
f5a8b3a7
SG		 2848 return scsi_set_sense_information(buffer,
2849 cmd->scsi_sense_length,
2850 cmd->bad_sector);
2851
2852 return 0;
ab78fef4
BVA		 2853}
2854
de103c93
CH		 2855int
2856transport_send_check_condition_and_sense(struct se_cmd *cmd,
2857 sense_reason_t reason, int from_transport)
c66ac9db 2858{
c66ac9db 2859 unsigned long flags;
c66ac9db 2860
a1d8b49a 2861 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2862 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2863 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2864 return 0;
2865 }
2866 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2867 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2868
ab78fef4 2869 if (!from_transport) {
f5a8b3a7
SG		 2870 int rc;
2871
c66ac9db 2872 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 2873 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2874 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 2875 rc = translate_sense_reason(cmd, reason);
2876 if (rc)
2877 return rc;
c66ac9db 2878 }
c66ac9db 2879
e5c0d6ad 2880 trace_target_cmd_complete(cmd);
07bde79a 2881 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2882}
2883EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2884
310d3d31
NB		 2885static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2886 __releases(&cmd->t_state_lock)
2887 __acquires(&cmd->t_state_lock)
c66ac9db 2888{
310d3d31
NB		 2889 assert_spin_locked(&cmd->t_state_lock);
2890 WARN_ON_ONCE(!irqs_disabled());
2891
c18bc7d8
RD		 2892 if (!(cmd->transport_state & CMD_T_ABORTED))
2893 return 0;
68259b5a
AL		 2894 /*
2895 * If cmd has been aborted but either no status is to be sent or it has
2896 * already been sent, just return
2897 */
310d3d31
NB		 2898 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
2899 if (send_status)
2900 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c18bc7d8 2901 return 1;
310d3d31 2902 }
8b1e1244 2903
310d3d31
NB		 2904 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
2905 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2906
68259b5a 2907 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2908 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2909 trace_target_cmd_complete(cmd);
310d3d31
NB		 2910
2911 spin_unlock_irq(&cmd->t_state_lock);
c18bc7d8 2912 cmd->se_tfo->queue_status(cmd);
310d3d31 2913 spin_lock_irq(&cmd->t_state_lock);
c18bc7d8
RD		 2914
2915 return 1;
c66ac9db 2916}
310d3d31
NB		 2917
2918int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2919{
2920 int ret;
2921
2922 spin_lock_irq(&cmd->t_state_lock);
2923 ret = __transport_check_aborted_status(cmd, send_status);
2924 spin_unlock_irq(&cmd->t_state_lock);
2925
2926 return ret;
2927}
c66ac9db
NB		 2928EXPORT_SYMBOL(transport_check_aborted_status);
2929
2930void transport_send_task_abort(struct se_cmd *cmd)
2931{
c252f003
NB		 2932 unsigned long flags;
2933
2934 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2935 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2936 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2937 return;
2938 }
2939 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2940
c66ac9db
NB		 2941 /*
2942 * If there are still expected incoming fabric WRITEs, we wait
2943 * until until they have completed before sending a TASK_ABORTED
2944 * response. This response with TASK_ABORTED status will be
2945 * queued back to fabric module by transport_check_aborted_status().
2946 */
2947 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2948 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
310d3d31
NB		 2949 spin_lock_irqsave(&cmd->t_state_lock, flags);
2950 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
2951 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2952 goto send_abort;
2953 }
68259b5a 2954 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
310d3d31 2955 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
29f4c090 2956 return;
c66ac9db
NB		 2957 }
2958 }
310d3d31 2959send_abort:
c66ac9db 2960 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2961
72b59d6e
RD		 2962 transport_lun_remove_cmd(cmd);
2963
649ee054
BVA		 2964 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
2965 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2966
e5c0d6ad 2967 trace_target_cmd_complete(cmd);
e3d6f909 2968 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2969}
2970
af877292 2971static void target_tmr_work(struct work_struct *work)
c66ac9db 2972{
af877292 2973 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2974 struct se_device *dev = cmd->se_dev;
c66ac9db 2975 struct se_tmr_req *tmr = cmd->se_tmr_req;
a6d9bb1c 2976 unsigned long flags;
c66ac9db
NB		 2977 int ret;
2978
a6d9bb1c
NB		 2979 spin_lock_irqsave(&cmd->t_state_lock, flags);
2980 if (cmd->transport_state & CMD_T_ABORTED) {
2981 tmr->response = TMR_FUNCTION_REJECTED;
2982 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2983 goto check_stop;
2984 }
2985 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2986
c66ac9db 2987 switch (tmr->function) {
5c6cd613 2988 case TMR_ABORT_TASK:
3d28934a 2989 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2990 break;
5c6cd613
NB		 2991 case TMR_ABORT_TASK_SET:
2992 case TMR_CLEAR_ACA:
2993 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2994 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2995 break;
5c6cd613 2996 case TMR_LUN_RESET:
c66ac9db
NB		 2997 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2998 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2999 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 3000 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3001 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3002 cmd->orig_fe_lun, 0x29,
3003 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3004 }
c66ac9db 3005 break;
5c6cd613 3006 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3007 tmr->response = TMR_FUNCTION_REJECTED;
3008 break;
5c6cd613 3009 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3010 tmr->response = TMR_FUNCTION_REJECTED;
3011 break;
c66ac9db 3012 default:
6708bb27 3013 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3014 tmr->function);
3015 tmr->response = TMR_FUNCTION_REJECTED;
3016 break;
3017 }
3018
a6d9bb1c
NB		 3019 spin_lock_irqsave(&cmd->t_state_lock, flags);
3020 if (cmd->transport_state & CMD_T_ABORTED) {
3021 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3022 goto check_stop;
3023 }
c66ac9db 3024 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
a6d9bb1c
NB		 3025 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3026
e3d6f909 3027 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3028
a6d9bb1c 3029check_stop:
b7b8bef7 3030 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3031}
3032
af877292
CH		 3033int transport_generic_handle_tmr(
3034 struct se_cmd *cmd)
c66ac9db 3035{
f15e9cd9
NB		 3036 unsigned long flags;
3037
3038 spin_lock_irqsave(&cmd->t_state_lock, flags);
3039 cmd->transport_state |= CMD_T_ACTIVE;
3040 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3041
af877292
CH		 3042 INIT_WORK(&cmd->work, target_tmr_work);
3043 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3044 return 0;
3045}
af877292 3046EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3047
3048bool
3049target_check_wce(struct se_device *dev)
3050{
3051 bool wce = false;
3052
3053 if (dev->transport->get_write_cache)
3054 wce = dev->transport->get_write_cache(dev);
3055 else if (dev->dev_attrib.emulate_write_cache > 0)
3056 wce = true;
3057
3058 return wce;
3059}
3060
3061bool
3062target_check_fua(struct se_device *dev)
3063{
3064 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3065}
Linux 6.x block layer and io_uring tree(s)