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scsi: Protect against buffer possible overflow in scsi_set_sense_information
[mirror_ubuntu-bionic-kernel.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
5538d294 37#include <linux/vmalloc.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
ba929992 41#include <scsi/scsi_proto.h>
9ec1e1ce 42#include <scsi/scsi_common.h>
c66ac9db
NB		 43
44#include <target/target_core_base.h>
c4795fb2
CH		 45#include <target/target_core_backend.h>
46#include <target/target_core_fabric.h>
c66ac9db 47
e26d99ae 48#include "target_core_internal.h"
c66ac9db 49#include "target_core_alua.h"
c66ac9db 50#include "target_core_pr.h"
c66ac9db
NB		 51#include "target_core_ua.h"
52
e5c0d6ad
RD		 53#define CREATE_TRACE_POINTS
54#include <trace/events/target.h>
55
35e0e757 56static struct workqueue_struct *target_completion_wq;
c66ac9db 57static struct kmem_cache *se_sess_cache;
c66ac9db 58struct kmem_cache *se_ua_cache;
c66ac9db
NB		 59struct kmem_cache *t10_pr_reg_cache;
60struct kmem_cache *t10_alua_lu_gp_cache;
61struct kmem_cache *t10_alua_lu_gp_mem_cache;
62struct kmem_cache *t10_alua_tg_pt_gp_cache;
229d4f11
HR		 63struct kmem_cache *t10_alua_lba_map_cache;
64struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 65
c66ac9db 66static void transport_complete_task_attr(struct se_cmd *cmd);
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
NB		 344 kref_get(&se_nacl->acl_kref);
345
c66ac9db
NB		 346 spin_lock_irq(&se_nacl->nacl_sess_lock);
347 /*
348 * The se_nacl->nacl_sess pointer will be set to the
349 * last active I_T Nexus for each struct se_node_acl.
350 */
351 se_nacl->nacl_sess = se_sess;
352
353 list_add_tail(&se_sess->sess_acl_list,
354 &se_nacl->acl_sess_list);
355 spin_unlock_irq(&se_nacl->nacl_sess_lock);
356 }
357 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
358
6708bb27 359 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 360 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 361}
362EXPORT_SYMBOL(__transport_register_session);
363
364void transport_register_session(
365 struct se_portal_group *se_tpg,
366 struct se_node_acl *se_nacl,
367 struct se_session *se_sess,
368 void *fabric_sess_ptr)
369{
140854cb
NB		 370 unsigned long flags;
371
372 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 373 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 374 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 375}
376EXPORT_SYMBOL(transport_register_session);
377
ecf0dd66 378static void target_release_session(struct kref *kref)
41ac82b6
NB		 379{
380 struct se_session *se_sess = container_of(kref,
381 struct se_session, sess_kref);
382 struct se_portal_group *se_tpg = se_sess->se_tpg;
383
384 se_tpg->se_tpg_tfo->close_session(se_sess);
385}
386
387void target_get_session(struct se_session *se_sess)
388{
389 kref_get(&se_sess->sess_kref);
390}
391EXPORT_SYMBOL(target_get_session);
392
33933a0e 393void target_put_session(struct se_session *se_sess)
41ac82b6 394{
33933a0e 395 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 396}
397EXPORT_SYMBOL(target_put_session);
398
f8e471f9
NB		 399ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
400{
401 struct se_session *se_sess;
402 ssize_t len = 0;
403
404 spin_lock_bh(&se_tpg->session_lock);
405 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
406 if (!se_sess->se_node_acl)
407 continue;
408 if (!se_sess->se_node_acl->dynamic_node_acl)
409 continue;
410 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
411 break;
412
413 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
414 se_sess->se_node_acl->initiatorname);
415 len += 1; /* Include NULL terminator */
416 }
417 spin_unlock_bh(&se_tpg->session_lock);
418
419 return len;
420}
421EXPORT_SYMBOL(target_show_dynamic_sessions);
422
afb999ff
NB		 423static void target_complete_nacl(struct kref *kref)
424{
425 struct se_node_acl *nacl = container_of(kref,
426 struct se_node_acl, acl_kref);
427
428 complete(&nacl->acl_free_comp);
429}
430
431void target_put_nacl(struct se_node_acl *nacl)
432{
433 kref_put(&nacl->acl_kref, target_complete_nacl);
434}
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{
c0add7fd
NB		 467 if (se_sess->sess_cmd_map) {
468 percpu_ida_destroy(&se_sess->sess_tag_pool);
de64d3a6 469 kvfree(se_sess->sess_cmd_map);
c0add7fd 470 }
c66ac9db
NB		 471 kmem_cache_free(se_sess_cache, se_sess);
472}
473EXPORT_SYMBOL(transport_free_session);
474
475void transport_deregister_session(struct se_session *se_sess)
476{
477 struct se_portal_group *se_tpg = se_sess->se_tpg;
9ac8928e 478 const struct target_core_fabric_ops *se_tfo;
c66ac9db 479 struct se_node_acl *se_nacl;
e63a8e19 480 unsigned long flags;
403edd78 481 bool comp_nacl = true, drop_nacl = false;
c66ac9db 482
6708bb27 483 if (!se_tpg) {
c66ac9db
NB		 484 transport_free_session(se_sess);
485 return;
486 }
01468346 487 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 488
e63a8e19 489 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 490 list_del(&se_sess->sess_list);
491 se_sess->se_tpg = NULL;
492 se_sess->fabric_sess_ptr = NULL;
e63a8e19 493 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 494
495 /*
496 * Determine if we need to do extra work for this initiator node's
497 * struct se_node_acl if it had been previously dynamically generated.
498 */
499 se_nacl = se_sess->se_node_acl;
01468346 500
403edd78 501 mutex_lock(&se_tpg->acl_node_mutex);
01468346
NB		 502 if (se_nacl && se_nacl->dynamic_node_acl) {
503 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
504 list_del(&se_nacl->acl_list);
505 se_tpg->num_node_acls--;
403edd78 506 drop_nacl = true;
c66ac9db 507 }
c66ac9db 508 }
403edd78 509 mutex_unlock(&se_tpg->acl_node_mutex);
c66ac9db 510
403edd78
NB		 511 if (drop_nacl) {
512 core_tpg_wait_for_nacl_pr_ref(se_nacl);
513 core_free_device_list_for_node(se_nacl, se_tpg);
514 kfree(se_nacl);
515 comp_nacl = false;
516 }
6708bb27 517 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 518 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 519 /*
125d0119 520 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff
NB		 521 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
522 * removal context.
01468346 523 */
0bcc297e 524 if (se_nacl && comp_nacl)
afb999ff 525 target_put_nacl(se_nacl);
01468346 526
afb999ff 527 transport_free_session(se_sess);
c66ac9db
NB		 528}
529EXPORT_SYMBOL(transport_deregister_session);
530
531/*
a1d8b49a 532 * Called with cmd->t_state_lock held.
c66ac9db 533 */
cf572a96 534static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 535{
42bf829e 536 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 537 unsigned long flags;
538
42bf829e
CH		 539 if (!dev)
540 return;
c66ac9db 541
cf572a96
CH		 542 if (cmd->transport_state & CMD_T_BUSY)
543 return;
c66ac9db 544
cf572a96
CH		 545 spin_lock_irqsave(&dev->execute_task_lock, flags);
546 if (cmd->state_active) {
547 list_del(&cmd->state_list);
cf572a96 548 cmd->state_active = false;
c66ac9db 549 }
cf572a96 550 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 551}
552
862e6389
NB		 553static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
554 bool write_pending)
c66ac9db
NB		 555{
556 unsigned long flags;
557
a1d8b49a 558 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 559 if (write_pending)
560 cmd->t_state = TRANSPORT_WRITE_PENDING;
561
f7113a47
CH		 562 if (remove_from_lists) {
563 target_remove_from_state_list(cmd);
564
565 /*
566 * Clear struct se_cmd->se_lun before the handoff to FE.
567 */
568 cmd->se_lun = NULL;
569 }
570
c66ac9db
NB		 571 /*
572 * Determine if frontend context caller is requesting the stopping of
e3d6f909 573 * this command for frontend exceptions.
c66ac9db 574 */
7d680f3b 575 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 576 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
577 __func__, __LINE__, cmd->tag);
c66ac9db 578
a1d8b49a 579 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 580
a95d6511 581 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 582 return 1;
583 }
f7113a47
CH		 584
585 cmd->transport_state &= ~CMD_T_ACTIVE;
586 if (remove_from_lists) {
587 /*
588 * Some fabric modules like tcm_loop can release
589 * their internally allocated I/O reference now and
590 * struct se_cmd now.
591 *
592 * Fabric modules are expected to return '1' here if the
593 * se_cmd being passed is released at this point,
594 * or zero if not being released.
595 */
596 if (cmd->se_tfo->check_stop_free != NULL) {
597 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
598 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 599 }
f7113a47 600 }
c66ac9db 601
a1d8b49a 602 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 603 return 0;
604}
605
606static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
607{
862e6389 608 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 609}
610
611static void transport_lun_remove_cmd(struct se_cmd *cmd)
612{
e3d6f909 613 struct se_lun *lun = cmd->se_lun;
c66ac9db 614
5259a06e 615 if (!lun)
c66ac9db
NB		 616 return;
617
5259a06e
NB		 618 if (cmpxchg(&cmd->lun_ref_active, true, false))
619 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 620}
621
622void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
623{
68259b5a
AL		 624 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
625 transport_lun_remove_cmd(cmd);
131e6abc
NB		 626 /*
627 * Allow the fabric driver to unmap any resources before
628 * releasing the descriptor via TFO->release_cmd()
629 */
630 if (remove)
631 cmd->se_tfo->aborted_task(cmd);
68259b5a 632
c66ac9db
NB		 633 if (transport_cmd_check_stop_to_fabric(cmd))
634 return;
af877292 635 if (remove)
e6a2573f 636 transport_put_cmd(cmd);
c66ac9db
NB		 637}
638
35e0e757
CH		 639static void target_complete_failure_work(struct work_struct *work)
640{
641 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
642
de103c93
CH		 643 transport_generic_request_failure(cmd,
644 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 645}
646
6138ed2a 647/*
d5829eac
PB		 648 * Used when asking transport to copy Sense Data from the underlying
649 * Linux/SCSI struct scsi_cmnd
6138ed2a 650 */
d5829eac 651static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 652{
6138ed2a 653 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 654
655 WARN_ON(!cmd->se_lun);
656
657 if (!dev)
d5829eac 658 return NULL;
6138ed2a 659
d5829eac
PB		 660 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
661 return NULL;
6138ed2a 662
9c58b7dd 663 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 664
d5829eac 665 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 666 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 667 return cmd->sense_buffer;
6138ed2a
PB		 668}
669
5787cacd 670void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 671{
42bf829e 672 struct se_device *dev = cmd->se_dev;
5787cacd 673 int success = scsi_status == GOOD;
c66ac9db 674 unsigned long flags;
c66ac9db 675
5787cacd
CH		 676 cmd->scsi_status = scsi_status;
677
678
a1d8b49a 679 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 680 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 681
c66ac9db 682 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 683 dev->transport->transport_complete(cmd,
684 cmd->t_data_sg,
685 transport_get_sense_buffer(cmd));
686 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 687 success = 1;
c66ac9db
NB		 688 }
689
690 /*
5787cacd 691 * See if we are waiting to complete for an exception condition.
c66ac9db 692 */
cf572a96 693 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 694 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 695 complete(&cmd->task_stop_comp);
c66ac9db
NB		 696 return;
697 }
2235007c 698
3d28934a 699 /*
125d0119 700 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 701 * and transport_wait_for_tasks() will be waiting for completion..
702 */
703 if (cmd->transport_state & CMD_T_ABORTED &&
704 cmd->transport_state & CMD_T_STOP) {
705 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 706 complete_all(&cmd->t_transport_stop_comp);
3d28934a 707 return;
3dca1471 708 } else if (!success) {
35e0e757 709 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 710 } else {
35e0e757 711 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 712 }
35e0e757 713
35e0e757 714 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 715 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 716 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 717
35e0e757 718 queue_work(target_completion_wq, &cmd->work);
c66ac9db 719}
6bb35e00
CH		 720EXPORT_SYMBOL(target_complete_cmd);
721
2426bd45
RD		 722void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
723{
724 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
725 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
726 cmd->residual_count += cmd->data_length - length;
727 } else {
728 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
729 cmd->residual_count = cmd->data_length - length;
730 }
731
732 cmd->data_length = length;
733 }
734
735 target_complete_cmd(cmd, scsi_status);
736}
737EXPORT_SYMBOL(target_complete_cmd_with_length);
738
cf572a96 739static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 740{
cf572a96
CH		 741 struct se_device *dev = cmd->se_dev;
742 unsigned long flags;
c66ac9db 743
cf572a96
CH		 744 spin_lock_irqsave(&dev->execute_task_lock, flags);
745 if (!cmd->state_active) {
746 list_add_tail(&cmd->state_list, &dev->state_list);
747 cmd->state_active = true;
c66ac9db 748 }
cf572a96 749 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 750}
751
07bde79a 752/*
f147abb4 753 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 754 */
7a6f0a1e
CH		 755static void transport_write_pending_qf(struct se_cmd *cmd);
756static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 757
0fd97ccf 758void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 759{
760 struct se_device *dev = container_of(work, struct se_device,
761 qf_work_queue);
bcac364a 762 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 763 struct se_cmd *cmd, *cmd_tmp;
764
765 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 766 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
767 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 768
bcac364a 769 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 770 list_del(&cmd->se_qf_node);
33940d09 771 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 772
6708bb27 773 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 774 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 775 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 776 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
777 : "UNKNOWN");
f7a5cc0b 778
7a6f0a1e
CH		 779 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
780 transport_write_pending_qf(cmd);
781 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
782 transport_complete_qf(cmd);
07bde79a 783 }
07bde79a
NB		 784}
785
c66ac9db
NB		 786unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
787{
788 switch (cmd->data_direction) {
789 case DMA_NONE:
790 return "NONE";
791 case DMA_FROM_DEVICE:
792 return "READ";
793 case DMA_TO_DEVICE:
794 return "WRITE";
795 case DMA_BIDIRECTIONAL:
796 return "BIDI";
797 default:
798 break;
799 }
800
801 return "UNKNOWN";
802}
803
804void transport_dump_dev_state(
805 struct se_device *dev,
806 char *b,
807 int *bl)
808{
809 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 810 if (dev->export_count)
c66ac9db 811 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 812 else
c66ac9db 813 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 814
5f41a31d 815 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 816 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 817 dev->dev_attrib.block_size,
818 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 819 *bl += sprintf(b + *bl, " ");
820}
821
c66ac9db
NB		 822void transport_dump_vpd_proto_id(
823 struct t10_vpd *vpd,
824 unsigned char *p_buf,
825 int p_buf_len)
826{
827 unsigned char buf[VPD_TMP_BUF_SIZE];
828 int len;
829
830 memset(buf, 0, VPD_TMP_BUF_SIZE);
831 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
832
833 switch (vpd->protocol_identifier) {
834 case 0x00:
835 sprintf(buf+len, "Fibre Channel\n");
836 break;
837 case 0x10:
838 sprintf(buf+len, "Parallel SCSI\n");
839 break;
840 case 0x20:
841 sprintf(buf+len, "SSA\n");
842 break;
843 case 0x30:
844 sprintf(buf+len, "IEEE 1394\n");
845 break;
846 case 0x40:
847 sprintf(buf+len, "SCSI Remote Direct Memory Access"
848 " Protocol\n");
849 break;
850 case 0x50:
851 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
852 break;
853 case 0x60:
854 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
855 break;
856 case 0x70:
857 sprintf(buf+len, "Automation/Drive Interface Transport"
858 " Protocol\n");
859 break;
860 case 0x80:
861 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
862 break;
863 default:
864 sprintf(buf+len, "Unknown 0x%02x\n",
865 vpd->protocol_identifier);
866 break;
867 }
868
869 if (p_buf)
870 strncpy(p_buf, buf, p_buf_len);
871 else
6708bb27 872 pr_debug("%s", buf);
c66ac9db
NB		 873}
874
875void
876transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
877{
878 /*
879 * Check if the Protocol Identifier Valid (PIV) bit is set..
880 *
881 * from spc3r23.pdf section 7.5.1
882 */
883 if (page_83[1] & 0x80) {
884 vpd->protocol_identifier = (page_83[0] & 0xf0);
885 vpd->protocol_identifier_set = 1;
886 transport_dump_vpd_proto_id(vpd, NULL, 0);
887 }
888}
889EXPORT_SYMBOL(transport_set_vpd_proto_id);
890
891int transport_dump_vpd_assoc(
892 struct t10_vpd *vpd,
893 unsigned char *p_buf,
894 int p_buf_len)
895{
896 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 897 int ret = 0;
898 int len;
c66ac9db
NB		 899
900 memset(buf, 0, VPD_TMP_BUF_SIZE);
901 len = sprintf(buf, "T10 VPD Identifier Association: ");
902
903 switch (vpd->association) {
904 case 0x00:
905 sprintf(buf+len, "addressed logical unit\n");
906 break;
907 case 0x10:
908 sprintf(buf+len, "target port\n");
909 break;
910 case 0x20:
911 sprintf(buf+len, "SCSI target device\n");
912 break;
913 default:
914 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 915 ret = -EINVAL;
c66ac9db
NB		 916 break;
917 }
918
919 if (p_buf)
920 strncpy(p_buf, buf, p_buf_len);
921 else
6708bb27 922 pr_debug("%s", buf);
c66ac9db
NB		 923
924 return ret;
925}
926
927int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
928{
929 /*
930 * The VPD identification association..
931 *
932 * from spc3r23.pdf Section 7.6.3.1 Table 297
933 */
934 vpd->association = (page_83[1] & 0x30);
935 return transport_dump_vpd_assoc(vpd, NULL, 0);
936}
937EXPORT_SYMBOL(transport_set_vpd_assoc);
938
939int transport_dump_vpd_ident_type(
940 struct t10_vpd *vpd,
941 unsigned char *p_buf,
942 int p_buf_len)
943{
944 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 945 int ret = 0;
946 int len;
c66ac9db
NB		 947
948 memset(buf, 0, VPD_TMP_BUF_SIZE);
949 len = sprintf(buf, "T10 VPD Identifier Type: ");
950
951 switch (vpd->device_identifier_type) {
952 case 0x00:
953 sprintf(buf+len, "Vendor specific\n");
954 break;
955 case 0x01:
956 sprintf(buf+len, "T10 Vendor ID based\n");
957 break;
958 case 0x02:
959 sprintf(buf+len, "EUI-64 based\n");
960 break;
961 case 0x03:
962 sprintf(buf+len, "NAA\n");
963 break;
964 case 0x04:
965 sprintf(buf+len, "Relative target port identifier\n");
966 break;
967 case 0x08:
968 sprintf(buf+len, "SCSI name string\n");
969 break;
970 default:
971 sprintf(buf+len, "Unsupported: 0x%02x\n",
972 vpd->device_identifier_type);
e3d6f909 973 ret = -EINVAL;
c66ac9db
NB		 974 break;
975 }
976
e3d6f909
AG		 977 if (p_buf) {
978 if (p_buf_len < strlen(buf)+1)
979 return -EINVAL;
c66ac9db 980 strncpy(p_buf, buf, p_buf_len);
e3d6f909 981 } else {
6708bb27 982 pr_debug("%s", buf);
e3d6f909 983 }
c66ac9db
NB		 984
985 return ret;
986}
987
988int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
989{
990 /*
991 * The VPD identifier type..
992 *
993 * from spc3r23.pdf Section 7.6.3.1 Table 298
994 */
995 vpd->device_identifier_type = (page_83[1] & 0x0f);
996 return transport_dump_vpd_ident_type(vpd, NULL, 0);
997}
998EXPORT_SYMBOL(transport_set_vpd_ident_type);
999
1000int transport_dump_vpd_ident(
1001 struct t10_vpd *vpd,
1002 unsigned char *p_buf,
1003 int p_buf_len)
1004{
1005 unsigned char buf[VPD_TMP_BUF_SIZE];
1006 int ret = 0;
1007
1008 memset(buf, 0, VPD_TMP_BUF_SIZE);
1009
1010 switch (vpd->device_identifier_code_set) {
1011 case 0x01: /* Binary */
703d641d
DC		 1012 snprintf(buf, sizeof(buf),
1013 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1014 &vpd->device_identifier[0]);
1015 break;
1016 case 0x02: /* ASCII */
703d641d
DC		 1017 snprintf(buf, sizeof(buf),
1018 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1019 &vpd->device_identifier[0]);
1020 break;
1021 case 0x03: /* UTF-8 */
703d641d
DC		 1022 snprintf(buf, sizeof(buf),
1023 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1024 &vpd->device_identifier[0]);
1025 break;
1026 default:
1027 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1028 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1029 ret = -EINVAL;
c66ac9db
NB		 1030 break;
1031 }
1032
1033 if (p_buf)
1034 strncpy(p_buf, buf, p_buf_len);
1035 else
6708bb27 1036 pr_debug("%s", buf);
c66ac9db
NB		 1037
1038 return ret;
1039}
1040
1041int
1042transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1043{
1044 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1045 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1046
1047 /*
1048 * The VPD Code Set (encoding)
1049 *
1050 * from spc3r23.pdf Section 7.6.3.1 Table 296
1051 */
1052 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1053 switch (vpd->device_identifier_code_set) {
1054 case 0x01: /* Binary */
1055 vpd->device_identifier[j++] =
1056 hex_str[vpd->device_identifier_type];
1057 while (i < (4 + page_83[3])) {
1058 vpd->device_identifier[j++] =
1059 hex_str[(page_83[i] & 0xf0) >> 4];
1060 vpd->device_identifier[j++] =
1061 hex_str[page_83[i] & 0x0f];
1062 i++;
1063 }
1064 break;
1065 case 0x02: /* ASCII */
1066 case 0x03: /* UTF-8 */
1067 while (i < (4 + page_83[3]))
1068 vpd->device_identifier[j++] = page_83[i++];
1069 break;
1070 default:
1071 break;
1072 }
1073
1074 return transport_dump_vpd_ident(vpd, NULL, 0);
1075}
1076EXPORT_SYMBOL(transport_set_vpd_ident);
1077
de103c93
CH		 1078sense_reason_t
1079target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1080{
1081 struct se_device *dev = cmd->se_dev;
1082
1083 if (cmd->unknown_data_length) {
1084 cmd->data_length = size;
1085 } else if (size != cmd->data_length) {
1086 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1087 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1088 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1089 cmd->data_length, size, cmd->t_task_cdb[0]);
1090
9b3b8041
CH		 1091 if (cmd->data_direction == DMA_TO_DEVICE) {
1092 pr_err("Rejecting underflow/overflow"
1093 " WRITE data\n");
de103c93 1094 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1095 }
1096 /*
1097 * Reject READ_* or WRITE_* with overflow/underflow for
1098 * type SCF_SCSI_DATA_CDB.
1099 */
0fd97ccf 1100 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1101 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1102 " CDB on non 512-byte sector setup subsystem"
1103 " plugin: %s\n", dev->transport->name);
1104 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1105 return TCM_INVALID_CDB_FIELD;
9b3b8041 1106 }
4c054ba6
NB		 1107 /*
1108 * For the overflow case keep the existing fabric provided
1109 * ->data_length. Otherwise for the underflow case, reset
1110 * ->data_length to the smaller SCSI expected data transfer
1111 * length.
1112 */
9b3b8041
CH		 1113 if (size > cmd->data_length) {
1114 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1115 cmd->residual_count = (size - cmd->data_length);
1116 } else {
1117 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1118 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1119 cmd->data_length = size;
9b3b8041 1120 }
9b3b8041
CH		 1121 }
1122
1123 return 0;
1124
9b3b8041
CH		 1125}
1126
c66ac9db
NB		 1127/*
1128 * Used by fabric modules containing a local struct se_cmd within their
1129 * fabric dependent per I/O descriptor.
649ee054
BVA		 1130 *
1131 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1132 */
1133void transport_init_se_cmd(
1134 struct se_cmd *cmd,
9ac8928e 1135 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1136 struct se_session *se_sess,
1137 u32 data_length,
1138 int data_direction,
1139 int task_attr,
1140 unsigned char *sense_buffer)
1141{
5951146d 1142 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1143 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1144 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1145 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1146 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1147 init_completion(&cmd->cmd_wait_comp);
cf572a96 1148 init_completion(&cmd->task_stop_comp);
a1d8b49a 1149 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1150 kref_init(&cmd->cmd_kref);
7d680f3b 1151 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1152
1153 cmd->se_tfo = tfo;
1154 cmd->se_sess = se_sess;
1155 cmd->data_length = data_length;
1156 cmd->data_direction = data_direction;
1157 cmd->sam_task_attr = task_attr;
1158 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1159
1160 cmd->state_active = false;
c66ac9db
NB		 1161}
1162EXPORT_SYMBOL(transport_init_se_cmd);
1163
de103c93
CH		 1164static sense_reason_t
1165transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1166{
019c4ca6
CH		 1167 struct se_device *dev = cmd->se_dev;
1168
c66ac9db
NB		 1169 /*
1170 * Check if SAM Task Attribute emulation is enabled for this
1171 * struct se_device storage object
1172 */
a3541703 1173 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1174 return 0;
1175
68d81f40 1176 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1177 pr_debug("SAM Task Attribute ACA"
c66ac9db 1178 " emulation is not supported\n");
de103c93 1179 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1180 }
1181 /*
1182 * Used to determine when ORDERED commands should go from
1183 * Dormant to Active status.
1184 */
019c4ca6 1185 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
6708bb27 1186 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1187 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1188 dev->transport->name);
c66ac9db
NB		 1189 return 0;
1190}
1191
de103c93
CH		 1192sense_reason_t
1193target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1194{
0fd97ccf 1195 struct se_device *dev = cmd->se_dev;
de103c93 1196 sense_reason_t ret;
c66ac9db 1197
c66ac9db
NB		 1198 /*
1199 * Ensure that the received CDB is less than the max (252 + 8) bytes
1200 * for VARIABLE_LENGTH_CMD
1201 */
1202 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1203 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1204 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1205 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1206 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1207 }
1208 /*
1209 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1210 * allocate the additional extended CDB buffer now.. Otherwise
1211 * setup the pointer from __t_task_cdb to t_task_cdb.
1212 */
a1d8b49a
AG		 1213 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1214 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1215 GFP_KERNEL);
6708bb27
AG		 1216 if (!cmd->t_task_cdb) {
1217 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1218 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1219 scsi_command_size(cdb),
a1d8b49a 1220 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1221 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1222 }
1223 } else
a1d8b49a 1224 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1225 /*
a1d8b49a 1226 * Copy the original CDB into cmd->
c66ac9db 1227 */
a1d8b49a 1228 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1229
e5c0d6ad
RD		 1230 trace_target_sequencer_start(cmd);
1231
cb4f4d3c
CH		 1232 /*
1233 * Check for an existing UNIT ATTENTION condition
1234 */
de103c93
CH		 1235 ret = target_scsi3_ua_check(cmd);
1236 if (ret)
1237 return ret;
cb4f4d3c 1238
c87fbd56 1239 ret = target_alua_state_check(cmd);
de103c93
CH		 1240 if (ret)
1241 return ret;
cb4f4d3c 1242
d977f437 1243 ret = target_check_reservation(cmd);
f85eda8d
NB		 1244 if (ret) {
1245 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1246 return ret;
f85eda8d 1247 }
cb4f4d3c 1248
0fd97ccf 1249 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1250 if (ret)
1251 return ret;
1252
1253 ret = transport_check_alloc_task_attr(cmd);
1254 if (ret)
c66ac9db 1255 return ret;
cb4f4d3c 1256
cb4f4d3c 1257 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1258 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1259 return 0;
1260}
a12f41f8 1261EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1262
695434e1
NB		 1263/*
1264 * Used by fabric module frontends to queue tasks directly.
1265 * Many only be used from process context only
1266 */
1267int transport_handle_cdb_direct(
1268 struct se_cmd *cmd)
1269{
de103c93 1270 sense_reason_t ret;
dd8ae59d 1271
695434e1
NB		 1272 if (!cmd->se_lun) {
1273 dump_stack();
6708bb27 1274 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1275 return -EINVAL;
1276 }
1277 if (in_interrupt()) {
1278 dump_stack();
6708bb27 1279 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1280 " from interrupt context\n");
1281 return -EINVAL;
1282 }
dd8ae59d 1283 /*
af877292
CH		 1284 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1285 * outstanding descriptors are handled correctly during shutdown via
1286 * transport_wait_for_tasks()
dd8ae59d
NB		 1287 *
1288 * Also, we don't take cmd->t_state_lock here as we only expect
1289 * this to be called for initial descriptor submission.
1290 */
1291 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1292 cmd->transport_state |= CMD_T_ACTIVE;
1293
dd8ae59d
NB		 1294 /*
1295 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1296 * so follow TRANSPORT_NEW_CMD processing thread context usage
1297 * and call transport_generic_request_failure() if necessary..
1298 */
1299 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1300 if (ret)
1301 transport_generic_request_failure(cmd, ret);
dd8ae59d 1302 return 0;
695434e1
NB		 1303}
1304EXPORT_SYMBOL(transport_handle_cdb_direct);
1305
c5ff8d6b 1306sense_reason_t
de103c93
CH		 1307transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1308 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1309{
1310 if (!sgl || !sgl_count)
1311 return 0;
1312
1313 /*
1314 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1315 * scatterlists already have been set to follow what the fabric
1316 * passes for the original expected data transfer length.
1317 */
1318 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1319 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1320 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1321 return TCM_INVALID_CDB_FIELD;
1322 }
1323
1324 cmd->t_data_sg = sgl;
1325 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1326 cmd->t_bidi_data_sg = sgl_bidi;
1327 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1328
de103c93
CH		 1329 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1330 return 0;
1331}
1332
a026757f
NB		 1333/*
1334 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1335 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1336 *
1337 * @se_cmd: command descriptor to submit
1338 * @se_sess: associated se_sess for endpoint
1339 * @cdb: pointer to SCSI CDB
1340 * @sense: pointer to SCSI sense buffer
1341 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1342 * @data_length: fabric expected data transfer length
1343 * @task_addr: SAM task attribute
1344 * @data_dir: DMA data direction
1345 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1346 * @sgl: struct scatterlist memory for unidirectional mapping
1347 * @sgl_count: scatterlist count for unidirectional mapping
1348 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1349 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1350 * @sgl_prot: struct scatterlist memory protection information
1351 * @sgl_prot_count: scatterlist count for protection information
a6360785 1352 *
649ee054
BVA		 1353 * Task tags are supported if the caller has set @se_cmd->tag.
1354 *
d6dfc868
RD		 1355 * Returns non zero to signal active I/O shutdown failure. All other
1356 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1357 * but still return zero here.
1358 *
a6360785
NB		 1359 * This may only be called from process context, and also currently
1360 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1361 */
1362int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1363 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1364 u32 data_length, int task_attr, int data_dir, int flags,
1365 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1366 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1367 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1368{
1369 struct se_portal_group *se_tpg;
de103c93
CH		 1370 sense_reason_t rc;
1371 int ret;
a6360785
NB		 1372
1373 se_tpg = se_sess->se_tpg;
1374 BUG_ON(!se_tpg);
1375 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1376 BUG_ON(in_interrupt());
1377 /*
1378 * Initialize se_cmd for target operation. From this point
1379 * exceptions are handled by sending exception status via
1380 * target_core_fabric_ops->queue_status() callback
1381 */
1382 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1383 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1384 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1385 se_cmd->unknown_data_length = 1;
a6360785
NB		 1386 /*
1387 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1388 * se_sess->sess_cmd_list. A second kref_get here is necessary
1389 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1390 * kref_put() to happen during fabric packet acknowledgement.
1391 */
afc16604 1392 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1393 if (ret)
1394 return ret;
a6360785
NB		 1395 /*
1396 * Signal bidirectional data payloads to target-core
1397 */
1398 if (flags & TARGET_SCF_BIDI_OP)
1399 se_cmd->se_cmd_flags |= SCF_BIDI;
1400 /*
1401 * Locate se_lun pointer and attach it to struct se_cmd
1402 */
de103c93
CH		 1403 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1404 if (rc) {
1405 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1406 target_put_sess_cmd(se_cmd);
d6dfc868 1407 return 0;
735703ca 1408 }
b5b8e298
SG		 1409
1410 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1411 if (rc != 0) {
1412 transport_generic_request_failure(se_cmd, rc);
1413 return 0;
1414 }
1415
def2b339
NB		 1416 /*
1417 * Save pointers for SGLs containing protection information,
1418 * if present.
1419 */
1420 if (sgl_prot_count) {
1421 se_cmd->t_prot_sg = sgl_prot;
1422 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1423 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1424 }
d6e0175c 1425
a026757f
NB		 1426 /*
1427 * When a non zero sgl_count has been passed perform SGL passthrough
1428 * mapping for pre-allocated fabric memory instead of having target
1429 * core perform an internal SGL allocation..
1430 */
1431 if (sgl_count != 0) {
1432 BUG_ON(!sgl);
1433
944981c7
NB		 1434 /*
1435 * A work-around for tcm_loop as some userspace code via
1436 * scsi-generic do not memset their associated read buffers,
1437 * so go ahead and do that here for type non-data CDBs. Also
1438 * note that this is currently guaranteed to be a single SGL
1439 * for this case by target core in target_setup_cmd_from_cdb()
1440 * -> transport_generic_cmd_sequencer().
1441 */
1442 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1443 se_cmd->data_direction == DMA_FROM_DEVICE) {
1444 unsigned char *buf = NULL;
1445
1446 if (sgl)
1447 buf = kmap(sg_page(sgl)) + sgl->offset;
1448
1449 if (buf) {
1450 memset(buf, 0, sgl->length);
1451 kunmap(sg_page(sgl));
1452 }
1453 }
1454
a026757f
NB		 1455 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1456 sgl_bidi, sgl_bidi_count);
1457 if (rc != 0) {
de103c93 1458 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1459 return 0;
1460 }
1461 }
def2b339 1462
11e319ed
AG		 1463 /*
1464 * Check if we need to delay processing because of ALUA
1465 * Active/NonOptimized primary access state..
1466 */
1467 core_alua_check_nonop_delay(se_cmd);
1468
a6360785 1469 transport_handle_cdb_direct(se_cmd);
d6dfc868 1470 return 0;
a6360785 1471}
a026757f
NB		 1472EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1473
1474/*
1475 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1476 *
1477 * @se_cmd: command descriptor to submit
1478 * @se_sess: associated se_sess for endpoint
1479 * @cdb: pointer to SCSI CDB
1480 * @sense: pointer to SCSI sense buffer
1481 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1482 * @data_length: fabric expected data transfer length
1483 * @task_addr: SAM task attribute
1484 * @data_dir: DMA data direction
1485 * @flags: flags for command submission from target_sc_flags_tables
1486 *
649ee054
BVA		 1487 * Task tags are supported if the caller has set @se_cmd->tag.
1488 *
a026757f
NB		 1489 * Returns non zero to signal active I/O shutdown failure. All other
1490 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1491 * but still return zero here.
1492 *
1493 * This may only be called from process context, and also currently
1494 * assumes internal allocation of fabric payload buffer by target-core.
1495 *
1496 * It also assumes interal target core SGL memory allocation.
1497 */
1498int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1499 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1500 u32 data_length, int task_attr, int data_dir, int flags)
1501{
1502 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1503 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1504 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1505}
a6360785
NB		 1506EXPORT_SYMBOL(target_submit_cmd);
1507
9f0d05c2
NB		 1508static void target_complete_tmr_failure(struct work_struct *work)
1509{
1510 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1511
1512 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1513 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1514
1515 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1516}
1517
ea98d7f9
AG		 1518/**
1519 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1520 * for TMR CDBs
1521 *
1522 * @se_cmd: command descriptor to submit
1523 * @se_sess: associated se_sess for endpoint
1524 * @sense: pointer to SCSI sense buffer
1525 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1526 * @fabric_context: fabric context for TMR req
1527 * @tm_type: Type of TM request
c0974f89
NB		 1528 * @gfp: gfp type for caller
1529 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1530 * @flags: submit cmd flags
ea98d7f9
AG		 1531 *
1532 * Callable from all contexts.
1533 **/
1534
c7042cae 1535int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1536 unsigned char *sense, u64 unpacked_lun,
c0974f89
NB		 1537 void *fabric_tmr_ptr, unsigned char tm_type,
1538 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1539{
1540 struct se_portal_group *se_tpg;
1541 int ret;
1542
1543 se_tpg = se_sess->se_tpg;
1544 BUG_ON(!se_tpg);
1545
1546 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1547 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1548 /*
1549 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1550 * allocation failure.
1551 */
c0974f89 1552 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1553 if (ret < 0)
1554 return -ENOMEM;
ea98d7f9 1555
c0974f89
NB		 1556 if (tm_type == TMR_ABORT_TASK)
1557 se_cmd->se_tmr_req->ref_task_tag = tag;
1558
ea98d7f9 1559 /* See target_submit_cmd for commentary */
afc16604 1560 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1561 if (ret) {
1562 core_tmr_release_req(se_cmd->se_tmr_req);
1563 return ret;
1564 }
ea98d7f9 1565
ea98d7f9
AG		 1566 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1567 if (ret) {
9f0d05c2
NB		 1568 /*
1569 * For callback during failure handling, push this work off
1570 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1571 */
1572 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1573 schedule_work(&se_cmd->work);
c7042cae 1574 return 0;
ea98d7f9
AG		 1575 }
1576 transport_generic_handle_tmr(se_cmd);
c7042cae 1577 return 0;
ea98d7f9
AG		 1578}
1579EXPORT_SYMBOL(target_submit_tmr);
1580
cdbb70bb 1581/*
cf572a96 1582 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1583 * has completed.
1584 */
cf572a96 1585bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cb0df4d3
BVA		 1586 __releases(&cmd->t_state_lock)
1587 __acquires(&cmd->t_state_lock)
cdbb70bb 1588{
cdbb70bb
CH		 1589 bool was_active = false;
1590
cf572a96
CH		 1591 if (cmd->transport_state & CMD_T_BUSY) {
1592 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1593 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1594
cf572a96
CH		 1595 pr_debug("cmd %p waiting to complete\n", cmd);
1596 wait_for_completion(&cmd->task_stop_comp);
1597 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1598
1599 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1600 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1601 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1602 was_active = true;
1603 }
1604
cdbb70bb
CH		 1605 return was_active;
1606}
1607
c66ac9db
NB		 1608/*
1609 * Handle SAM-esque emulation for generic transport request failures.
1610 */
de103c93
CH		 1611void transport_generic_request_failure(struct se_cmd *cmd,
1612 sense_reason_t sense_reason)
c66ac9db 1613{
07bde79a
NB		 1614 int ret = 0;
1615
649ee054
BVA		 1616 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1617 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1618 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1619 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1620 cmd->t_state, sense_reason);
d43d6aea 1621 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1622 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1623 (cmd->transport_state & CMD_T_STOP) != 0,
1624 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1625
c66ac9db
NB		 1626 /*
1627 * For SAM Task Attribute emulation for failed struct se_cmd
1628 */
019c4ca6 1629 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1630 /*
1631 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1632 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1633 */
1634 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1635 cmd->transport_complete_callback)
c8e63985 1636 cmd->transport_complete_callback(cmd, false);
c66ac9db 1637
de103c93 1638 switch (sense_reason) {
03e98c9e
NB		 1639 case TCM_NON_EXISTENT_LUN:
1640 case TCM_UNSUPPORTED_SCSI_OPCODE:
1641 case TCM_INVALID_CDB_FIELD:
1642 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1643 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1644 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1645 case TCM_UNKNOWN_MODE_PAGE:
1646 case TCM_WRITE_PROTECTED:
e2397c70 1647 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1648 case TCM_CHECK_CONDITION_ABORT_CMD:
1649 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1650 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1651 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1652 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1653 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1654 break;
de103c93
CH		 1655 case TCM_OUT_OF_RESOURCES:
1656 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1657 break;
03e98c9e 1658 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1659 /*
1660 * No SENSE Data payload for this case, set SCSI Status
1661 * and queue the response to $FABRIC_MOD.
1662 *
1663 * Uses linux/include/scsi/scsi.h SAM status codes defs
1664 */
1665 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1666 /*
1667 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1668 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1669 * CONFLICT STATUS.
1670 *
1671 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1672 */
e3d6f909 1673 if (cmd->se_sess &&
c51c8e7b
HR		 1674 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1675 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1676 cmd->orig_fe_lun, 0x2C,
1677 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1678 }
e5c0d6ad 1679 trace_target_cmd_complete(cmd);
c51c8e7b 1680 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1681 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1682 goto queue_full;
c66ac9db 1683 goto check_stop;
c66ac9db 1684 default:
6708bb27 1685 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1686 cmd->t_task_cdb[0], sense_reason);
1687 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1688 break;
1689 }
f3146437 1690
de103c93 1691 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1692 if (ret == -EAGAIN || ret == -ENOMEM)
1693 goto queue_full;
07bde79a 1694
c66ac9db
NB		 1695check_stop:
1696 transport_lun_remove_cmd(cmd);
6708bb27 1697 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1698 ;
07bde79a
NB		 1699 return;
1700
1701queue_full:
e057f533
CH		 1702 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1703 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1704}
2fbff127 1705EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1706
76dde50e 1707void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1708{
de103c93 1709 sense_reason_t ret;
5f41a31d 1710
de103c93
CH		 1711 if (cmd->execute_cmd) {
1712 ret = cmd->execute_cmd(cmd);
1713 if (ret) {
1714 spin_lock_irq(&cmd->t_state_lock);
1715 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1716 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1717
de103c93
CH		 1718 transport_generic_request_failure(cmd, ret);
1719 }
5f41a31d
CH		 1720 }
1721}
1722
aa58b531
NB		 1723static int target_write_prot_action(struct se_cmd *cmd)
1724{
5132d1e6 1725 u32 sectors;
aa58b531
NB		 1726 /*
1727 * Perform WRITE_INSERT of PI using software emulation when backend
1728 * device has PI enabled, if the transport has not already generated
1729 * PI using hardware WRITE_INSERT offload.
1730 */
1731 switch (cmd->prot_op) {
1732 case TARGET_PROT_DOUT_INSERT:
1733 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1734 sbc_dif_generate(cmd);
1735 break;
5132d1e6
NB		 1736 case TARGET_PROT_DOUT_STRIP:
1737 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1738 break;
1739
1740 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1741 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1742 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1743 if (unlikely(cmd->pi_err)) {
1744 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1745 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1746 spin_unlock_irq(&cmd->t_state_lock);
1747 transport_generic_request_failure(cmd, cmd->pi_err);
1748 return -1;
1749 }
1750 break;
aa58b531
NB		 1751 default:
1752 break;
1753 }
1754
1755 return 0;
1756}
1757
019c4ca6 1758static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1759{
1760 struct se_device *dev = cmd->se_dev;
1761
a3541703 1762 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1763 return false;
5f41a31d 1764
c66ac9db 1765 /*
25985edc 1766 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1767 * to allow the passed struct se_cmd list of tasks to the front of the list.
1768 */
5f41a31d 1769 switch (cmd->sam_task_attr) {
68d81f40 1770 case TCM_HEAD_TAG:
5f41a31d
CH		 1771 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1772 "se_ordered_id: %u\n",
1773 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1774 return false;
68d81f40 1775 case TCM_ORDERED_TAG:
33940d09 1776 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1777
5f41a31d
CH		 1778 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1779 " se_ordered_id: %u\n",
1780 cmd->t_task_cdb[0], cmd->se_ordered_id);
1781
c66ac9db 1782 /*
5f41a31d
CH		 1783 * Execute an ORDERED command if no other older commands
1784 * exist that need to be completed first.
c66ac9db 1785 */
5f41a31d 1786 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1787 return false;
5f41a31d
CH		 1788 break;
1789 default:
c66ac9db
NB		 1790 /*
1791 * For SIMPLE and UNTAGGED Task Attribute commands
1792 */
33940d09 1793 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1794 break;
c66ac9db 1795 }
5f41a31d 1796
019c4ca6
CH		 1797 if (atomic_read(&dev->dev_ordered_sync) == 0)
1798 return false;
c66ac9db 1799
019c4ca6
CH		 1800 spin_lock(&dev->delayed_cmd_lock);
1801 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1802 spin_unlock(&dev->delayed_cmd_lock);
1803
1804 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1805 " delayed CMD list, se_ordered_id: %u\n",
1806 cmd->t_task_cdb[0], cmd->sam_task_attr,
1807 cmd->se_ordered_id);
1808 return true;
1809}
1810
1811void target_execute_cmd(struct se_cmd *cmd)
1812{
1813 /*
1814 * If the received CDB has aleady been aborted stop processing it here.
1815 */
4a9a6c8d 1816 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1817 return;
c66ac9db 1818
019c4ca6
CH		 1819 /*
1820 * Determine if frontend context caller is requesting the stopping of
1821 * this command for frontend exceptions.
1822 */
4a9a6c8d 1823 spin_lock_irq(&cmd->t_state_lock);
019c4ca6 1824 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1825 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1826 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1827
1828 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1829 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1830 return;
1831 }
1832
1833 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1834 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1835 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1836
1837 if (target_write_prot_action(cmd))
1838 return;
019c4ca6 1839
1a398b97
NB		 1840 if (target_handle_task_attr(cmd)) {
1841 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1842 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1843 spin_unlock_irq(&cmd->t_state_lock);
1844 return;
1845 }
1846
1847 __target_execute_cmd(cmd);
c66ac9db 1848}
70baf0ab 1849EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1850
5f41a31d
CH		 1851/*
1852 * Process all commands up to the last received ORDERED task attribute which
1853 * requires another blocking boundary
1854 */
1855static void target_restart_delayed_cmds(struct se_device *dev)
1856{
1857 for (;;) {
1858 struct se_cmd *cmd;
1859
1860 spin_lock(&dev->delayed_cmd_lock);
1861 if (list_empty(&dev->delayed_cmd_list)) {
1862 spin_unlock(&dev->delayed_cmd_lock);
1863 break;
1864 }
1865
1866 cmd = list_entry(dev->delayed_cmd_list.next,
1867 struct se_cmd, se_delayed_node);
1868 list_del(&cmd->se_delayed_node);
1869 spin_unlock(&dev->delayed_cmd_lock);
1870
1871 __target_execute_cmd(cmd);
1872
68d81f40 1873 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1874 break;
1875 }
1876}
1877
c66ac9db 1878/*
35e0e757 1879 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1880 * and ordered cmds need to have their tasks added to the execution queue.
1881 */
1882static void transport_complete_task_attr(struct se_cmd *cmd)
1883{
5951146d 1884 struct se_device *dev = cmd->se_dev;
c66ac9db 1885
a3541703 1886 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1887 return;
1888
68d81f40 1889 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1890 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1891 dev->dev_cur_ordered_id++;
6708bb27 1892 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1893 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1894 cmd->se_ordered_id);
68d81f40 1895 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1896 dev->dev_cur_ordered_id++;
6708bb27 1897 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1898 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1899 cmd->se_ordered_id);
68d81f40 1900 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1901 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1902
1903 dev->dev_cur_ordered_id++;
6708bb27 1904 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1905 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1906 }
c66ac9db 1907
5f41a31d 1908 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1909}
1910
e057f533 1911static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1912{
1913 int ret = 0;
1914
019c4ca6 1915 transport_complete_task_attr(cmd);
e057f533
CH		 1916
1917 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1918 trace_target_cmd_complete(cmd);
e057f533 1919 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1920 goto out;
e057f533 1921 }
07bde79a
NB		 1922
1923 switch (cmd->data_direction) {
1924 case DMA_FROM_DEVICE:
e5c0d6ad 1925 trace_target_cmd_complete(cmd);
07bde79a
NB		 1926 ret = cmd->se_tfo->queue_data_in(cmd);
1927 break;
1928 case DMA_TO_DEVICE:
64577407 1929 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1930 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 1931 break;
07bde79a
NB		 1932 }
1933 /* Fall through for DMA_TO_DEVICE */
1934 case DMA_NONE:
e5c0d6ad 1935 trace_target_cmd_complete(cmd);
07bde79a
NB		 1936 ret = cmd->se_tfo->queue_status(cmd);
1937 break;
1938 default:
1939 break;
1940 }
1941
e057f533
CH		 1942out:
1943 if (ret < 0) {
1944 transport_handle_queue_full(cmd, cmd->se_dev);
1945 return;
1946 }
1947 transport_lun_remove_cmd(cmd);
1948 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1949}
1950
1951static void transport_handle_queue_full(
1952 struct se_cmd *cmd,
e057f533 1953 struct se_device *dev)
07bde79a
NB		 1954{
1955 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 1956 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 1957 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 1958 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1959
1960 schedule_work(&cmd->se_dev->qf_work_queue);
1961}
1962
fdeab852 1963static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 1964{
fdeab852
NB		 1965 switch (cmd->prot_op) {
1966 case TARGET_PROT_DIN_STRIP:
1967 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 1968 u32 sectors = cmd->data_length >>
1969 ilog2(cmd->se_dev->dev_attrib.block_size);
1970
1971 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1972 sectors, 0, cmd->t_prot_sg,
1973 0);
1974 if (cmd->pi_err)
fdeab852 1975 return true;
bc005869 1976 }
fdeab852 1977 break;
72c03850
NB		 1978 case TARGET_PROT_DIN_INSERT:
1979 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
1980 break;
1981
1982 sbc_dif_generate(cmd);
1983 break;
fdeab852
NB		 1984 default:
1985 break;
bc005869
NB		 1986 }
1987
1988 return false;
1989}
1990
35e0e757 1991static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1992{
35e0e757 1993 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1994 int ret;
35e0e757 1995
c66ac9db
NB		 1996 /*
1997 * Check if we need to move delayed/dormant tasks from cmds on the
1998 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1999 * Attribute.
2000 */
019c4ca6
CH		 2001 transport_complete_task_attr(cmd);
2002
07bde79a
NB		 2003 /*
2004 * Check to schedule QUEUE_FULL work, or execute an existing
2005 * cmd->transport_qf_callback()
2006 */
2007 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2008 schedule_work(&cmd->se_dev->qf_work_queue);
2009
c66ac9db 2010 /*
d5829eac 2011 * Check if we need to send a sense buffer from
c66ac9db
NB		 2012 * the struct se_cmd in question.
2013 */
2014 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2015 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2016 ret = transport_send_check_condition_and_sense(
2017 cmd, 0, 1);
2018 if (ret == -EAGAIN || ret == -ENOMEM)
2019 goto queue_full;
2020
2021 transport_lun_remove_cmd(cmd);
2022 transport_cmd_check_stop_to_fabric(cmd);
2023 return;
c66ac9db
NB		 2024 }
2025 /*
25985edc 2026 * Check for a callback, used by amongst other things
a6b0133c 2027 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2028 */
a6b0133c
NB		 2029 if (cmd->transport_complete_callback) {
2030 sense_reason_t rc;
2031
c8e63985 2032 rc = cmd->transport_complete_callback(cmd, true);
a2890087 2033 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
c8e63985
NB		 2034 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2035 !cmd->data_length)
2036 goto queue_rsp;
2037
a6b0133c 2038 return;
a2890087
NB		 2039 } else if (rc) {
2040 ret = transport_send_check_condition_and_sense(cmd,
2041 rc, 0);
2042 if (ret == -EAGAIN || ret == -ENOMEM)
2043 goto queue_full;
a6b0133c 2044
a2890087
NB		 2045 transport_lun_remove_cmd(cmd);
2046 transport_cmd_check_stop_to_fabric(cmd);
2047 return;
2048 }
a6b0133c 2049 }
c66ac9db 2050
c8e63985 2051queue_rsp:
c66ac9db
NB		 2052 switch (cmd->data_direction) {
2053 case DMA_FROM_DEVICE:
4cc987ea
NB		 2054 atomic_long_add(cmd->data_length,
2055 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2056 /*
2057 * Perform READ_STRIP of PI using software emulation when
2058 * backend had PI enabled, if the transport will not be
2059 * performing hardware READ_STRIP offload.
2060 */
fdeab852 2061 if (target_read_prot_action(cmd)) {
bc005869
NB		 2062 ret = transport_send_check_condition_and_sense(cmd,
2063 cmd->pi_err, 0);
2064 if (ret == -EAGAIN || ret == -ENOMEM)
2065 goto queue_full;
2066
2067 transport_lun_remove_cmd(cmd);
2068 transport_cmd_check_stop_to_fabric(cmd);
2069 return;
2070 }
c66ac9db 2071
e5c0d6ad 2072 trace_target_cmd_complete(cmd);
07bde79a 2073 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2074 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2075 goto queue_full;
c66ac9db
NB		 2076 break;
2077 case DMA_TO_DEVICE:
4cc987ea
NB		 2078 atomic_long_add(cmd->data_length,
2079 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2080 /*
2081 * Check if we need to send READ payload for BIDI-COMMAND
2082 */
64577407 2083 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2084 atomic_long_add(cmd->data_length,
2085 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2086 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2087 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2088 goto queue_full;
c66ac9db
NB		 2089 break;
2090 }
2091 /* Fall through for DMA_TO_DEVICE */
2092 case DMA_NONE:
e5c0d6ad 2093 trace_target_cmd_complete(cmd);
07bde79a 2094 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2095 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2096 goto queue_full;
c66ac9db
NB		 2097 break;
2098 default:
2099 break;
2100 }
2101
2102 transport_lun_remove_cmd(cmd);
2103 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2104 return;
2105
2106queue_full:
6708bb27 2107 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2108 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2109 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2110 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2111}
2112
6708bb27 2113static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2114{
ec98f782 2115 struct scatterlist *sg;
ec98f782 2116 int count;
c66ac9db 2117
6708bb27
AG		 2118 for_each_sg(sgl, sg, nents, count)
2119 __free_page(sg_page(sg));
c66ac9db 2120
6708bb27
AG		 2121 kfree(sgl);
2122}
c66ac9db 2123
47e459e6
NB		 2124static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2125{
2126 /*
2127 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2128 * emulation, and free + reset pointers if necessary..
2129 */
2130 if (!cmd->t_data_sg_orig)
2131 return;
2132
2133 kfree(cmd->t_data_sg);
2134 cmd->t_data_sg = cmd->t_data_sg_orig;
2135 cmd->t_data_sg_orig = NULL;
2136 cmd->t_data_nents = cmd->t_data_nents_orig;
2137 cmd->t_data_nents_orig = 0;
2138}
2139
6708bb27
AG		 2140static inline void transport_free_pages(struct se_cmd *cmd)
2141{
5835812f
AM		 2142 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2143 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2144 cmd->t_prot_sg = NULL;
2145 cmd->t_prot_nents = 0;
2146 }
2147
47e459e6 2148 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2149 /*
2150 * Release special case READ buffer payload required for
2151 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2152 */
2153 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2154 transport_free_sgl(cmd->t_bidi_data_sg,
2155 cmd->t_bidi_data_nents);
2156 cmd->t_bidi_data_sg = NULL;
2157 cmd->t_bidi_data_nents = 0;
2158 }
47e459e6 2159 transport_reset_sgl_orig(cmd);
6708bb27 2160 return;
47e459e6
NB		 2161 }
2162 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2163
2164 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2165 cmd->t_data_sg = NULL;
2166 cmd->t_data_nents = 0;
c66ac9db 2167
6708bb27 2168 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2169 cmd->t_bidi_data_sg = NULL;
2170 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2171}
2172
e26d99ae
CH		 2173/**
2174 * transport_release_cmd - free a command
2175 * @cmd: command to free
2176 *
2177 * This routine unconditionally frees a command, and reference counting
2178 * or list removal must be done in the caller.
2179 */
d5ddad41 2180static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2181{
2182 BUG_ON(!cmd->se_tfo);
2183
c8e31f26 2184 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2185 core_tmr_release_req(cmd->se_tmr_req);
2186 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2187 kfree(cmd->t_task_cdb);
2188 /*
7481deb4
NB		 2189 * If this cmd has been setup with target_get_sess_cmd(), drop
2190 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2191 */
afc16604 2192 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2193}
2194
d3df7825
CH		 2195/**
2196 * transport_put_cmd - release a reference to a command
2197 * @cmd: command to release
2198 *
2199 * This routine releases our reference to the command and frees it if possible.
2200 */
d5ddad41 2201static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2202{
c66ac9db 2203 transport_free_pages(cmd);
d5ddad41 2204 return transport_release_cmd(cmd);
c66ac9db 2205}
c66ac9db 2206
4949314c 2207void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2208{
ec98f782 2209 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2210 struct page **pages;
2211 int i;
05d1c7c0
AG		 2212
2213 /*
ec98f782
AG		 2214 * We need to take into account a possible offset here for fabrics like
2215 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2216 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2217 */
4949314c
AG		 2218 if (!cmd->t_data_nents)
2219 return NULL;
3717ef0c
PB		 2220
2221 BUG_ON(!sg);
2222 if (cmd->t_data_nents == 1)
4949314c
AG		 2223 return kmap(sg_page(sg)) + sg->offset;
2224
2225 /* >1 page. use vmap */
2226 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2227 if (!pages)
4949314c
AG		 2228 return NULL;
2229
2230 /* convert sg[] to pages[] */
2231 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2232 pages[i] = sg_page(sg);
2233 }
2234
2235 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2236 kfree(pages);
de103c93 2237 if (!cmd->t_data_vmap)
4949314c
AG		 2238 return NULL;
2239
2240 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2241}
4949314c 2242EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2243
4949314c 2244void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2245{
a1edf9cf 2246 if (!cmd->t_data_nents) {
4949314c 2247 return;
a1edf9cf 2248 } else if (cmd->t_data_nents == 1) {
4949314c 2249 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2250 return;
2251 }
4949314c
AG		 2252
2253 vunmap(cmd->t_data_vmap);
2254 cmd->t_data_vmap = NULL;
05d1c7c0 2255}
4949314c 2256EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2257
c5ff8d6b 2258int
20093994
NB		 2259target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2260 bool zero_page)
c66ac9db 2261{
20093994 2262 struct scatterlist *sg;
ec98f782 2263 struct page *page;
20093994
NB		 2264 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2265 unsigned int nent;
ec98f782 2266 int i = 0;
c66ac9db 2267
20093994
NB		 2268 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2269 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2270 if (!sg)
ec98f782 2271 return -ENOMEM;
c66ac9db 2272
20093994 2273 sg_init_table(sg, nent);
9db9da33 2274
ec98f782
AG		 2275 while (length) {
2276 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2277 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2278 if (!page)
2279 goto out;
c66ac9db 2280
20093994 2281 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2282 length -= page_len;
2283 i++;
c66ac9db 2284 }
20093994
NB		 2285 *sgl = sg;
2286 *nents = nent;
c66ac9db 2287 return 0;
c66ac9db 2288
ec98f782 2289out:
d0e27c88 2290 while (i > 0) {
ec98f782 2291 i--;
20093994 2292 __free_page(sg_page(&sg[i]));
c66ac9db 2293 }
20093994 2294 kfree(sg);
ec98f782 2295 return -ENOMEM;
c66ac9db
NB		 2296}
2297
da0f7619 2298/*
b16a35b0
AG		 2299 * Allocate any required resources to execute the command. For writes we
2300 * might not have the payload yet, so notify the fabric via a call to
2301 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2302 */
de103c93
CH		 2303sense_reason_t
2304transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2305{
c66ac9db 2306 int ret = 0;
c8e63985 2307 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2308
5835812f
AM		 2309 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2310 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2311 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2312 cmd->prot_length, true);
2313 if (ret < 0)
2314 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2315 }
2316
c66ac9db
NB		 2317 /*
2318 * Determine is the TCM fabric module has already allocated physical
2319 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2320 * beforehand.
c66ac9db 2321 */
ec98f782
AG		 2322 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2323 cmd->data_length) {
20093994 2324
8cefe07b
NB		 2325 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2326 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2327 u32 bidi_length;
2328
2329 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2330 bidi_length = cmd->t_task_nolb *
2331 cmd->se_dev->dev_attrib.block_size;
2332 else
2333 bidi_length = cmd->data_length;
2334
2335 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2336 &cmd->t_bidi_data_nents,
2337 bidi_length, zero_flag);
2338 if (ret < 0)
2339 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2340 }
2341
20093994
NB		 2342 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2343 cmd->data_length, zero_flag);
c66ac9db 2344 if (ret < 0)
de103c93 2345 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2346 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2347 cmd->data_length) {
2348 /*
2349 * Special case for COMPARE_AND_WRITE with fabrics
2350 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2351 */
2352 u32 caw_length = cmd->t_task_nolb *
2353 cmd->se_dev->dev_attrib.block_size;
2354
2355 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2356 &cmd->t_bidi_data_nents,
2357 caw_length, zero_flag);
2358 if (ret < 0)
2359 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2360 }
c66ac9db 2361 /*
c3196f0c
CH		 2362 * If this command is not a write we can execute it right here,
2363 * for write buffers we need to notify the fabric driver first
2364 * and let it call back once the write buffers are ready.
c66ac9db 2365 */
5f41a31d 2366 target_add_to_state_list(cmd);
885e7b0e 2367 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2368 target_execute_cmd(cmd);
2369 return 0;
2370 }
862e6389 2371 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2372
2373 ret = cmd->se_tfo->write_pending(cmd);
2374 if (ret == -EAGAIN || ret == -ENOMEM)
2375 goto queue_full;
2376
de103c93
CH		 2377 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2378 WARN_ON(ret);
2379
b69c1fcf 2380 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2381
c3196f0c
CH		 2382queue_full:
2383 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2384 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2385 transport_handle_queue_full(cmd, cmd->se_dev);
2386 return 0;
c66ac9db 2387}
a1d8b49a 2388EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2389
e057f533 2390static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2391{
f147abb4
NB		 2392 int ret;
2393
2394 ret = cmd->se_tfo->write_pending(cmd);
2395 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2396 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2397 cmd);
2398 transport_handle_queue_full(cmd, cmd->se_dev);
2399 }
07bde79a
NB		 2400}
2401
d5ddad41 2402int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2403{
c130480b 2404 unsigned long flags;
d5ddad41
NB		 2405 int ret = 0;
2406
d14921d6 2407 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2408 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2409 transport_wait_for_tasks(cmd);
2410
d5ddad41 2411 ret = transport_release_cmd(cmd);
d14921d6
NB		 2412 } else {
2413 if (wait_for_tasks)
2414 transport_wait_for_tasks(cmd);
c130480b
NB		 2415 /*
2416 * Handle WRITE failure case where transport_generic_new_cmd()
2417 * has already added se_cmd to state_list, but fabric has
2418 * failed command before I/O submission.
2419 */
2420 if (cmd->state_active) {
2421 spin_lock_irqsave(&cmd->t_state_lock, flags);
2422 target_remove_from_state_list(cmd);
2423 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2424 }
d14921d6 2425
82f1c8a4 2426 if (cmd->se_lun)
c66ac9db 2427 transport_lun_remove_cmd(cmd);
c66ac9db 2428
d5ddad41 2429 ret = transport_put_cmd(cmd);
c66ac9db 2430 }
d5ddad41 2431 return ret;
c66ac9db
NB		 2432}
2433EXPORT_SYMBOL(transport_generic_free_cmd);
2434
a17f091d 2435/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2436 * @se_cmd: command descriptor to add
a6360785 2437 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2438 */
afc16604 2439int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2440{
afc16604 2441 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2442 unsigned long flags;
bc187ea6 2443 int ret = 0;
a17f091d 2444
a6360785
NB		 2445 /*
2446 * Add a second kref if the fabric caller is expecting to handle
2447 * fabric acknowledgement that requires two target_put_sess_cmd()
2448 * invocations before se_cmd descriptor release.
2449 */
054922bb 2450 if (ack_kref)
a6360785 2451 kref_get(&se_cmd->cmd_kref);
7481deb4 2452
a17f091d 2453 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2454 if (se_sess->sess_tearing_down) {
2455 ret = -ESHUTDOWN;
2456 goto out;
2457 }
a17f091d 2458 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2459out:
a17f091d 2460 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2461
2462 if (ret && ack_kref)
afc16604 2463 target_put_sess_cmd(se_cmd);
7544e597 2464
bc187ea6 2465 return ret;
a17f091d 2466}
20361e69 2467EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2468
7481deb4 2469static void target_release_cmd_kref(struct kref *kref)
077aa3b2 2470 __releases(&se_cmd->se_sess->sess_cmd_lock)
a17f091d 2471{
7481deb4
NB		 2472 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2473 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2474
a17f091d 2475 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2476 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2477 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2478 return;
a17f091d 2479 }
a17f091d 2480 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2481 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2482 complete(&se_cmd->cmd_wait_comp);
7481deb4 2483 return;
a17f091d
NB		 2484 }
2485 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2486 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2487
7481deb4
NB		 2488 se_cmd->se_tfo->release_cmd(se_cmd);
2489}
2490
2491/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2492 * @se_cmd: command descriptor to drop
2493 */
afc16604 2494int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2495{
afc16604
BVA		 2496 struct se_session *se_sess = se_cmd->se_sess;
2497
0ed6e189
NB		 2498 if (!se_sess) {
2499 se_cmd->se_tfo->release_cmd(se_cmd);
2500 return 1;
2501 }
ccf5ae83
JE		 2502 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2503 &se_sess->sess_cmd_lock);
a17f091d
NB		 2504}
2505EXPORT_SYMBOL(target_put_sess_cmd);
2506
1c7b13fe
RD		 2507/* target_sess_cmd_list_set_waiting - Flag all commands in
2508 * sess_cmd_list to complete cmd_wait_comp. Set
2509 * sess_tearing_down so no more commands are queued.
2510 * @se_sess: session to flag
a17f091d 2511 */
1c7b13fe 2512void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2513{
2514 struct se_cmd *se_cmd;
2515 unsigned long flags;
2516
a17f091d 2517 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2518 if (se_sess->sess_tearing_down) {
2519 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2520 return;
2521 }
1c7b13fe 2522 se_sess->sess_tearing_down = 1;
9b31a328 2523 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2524
9b31a328 2525 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2526 se_cmd->cmd_wait_set = 1;
2527
2528 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2529}
1c7b13fe 2530EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2531
2532/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2533 * @se_sess: session to wait for active I/O
a17f091d 2534 */
be646c2d 2535void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2536{
2537 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2538 unsigned long flags;
a17f091d
NB		 2539
2540 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2541 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2542 list_del(&se_cmd->se_cmd_list);
2543
2544 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2545 " %d\n", se_cmd, se_cmd->t_state,
2546 se_cmd->se_tfo->get_cmd_state(se_cmd));
2547
be646c2d
JE		 2548 wait_for_completion(&se_cmd->cmd_wait_comp);
2549 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2550 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2551 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2552
2553 se_cmd->se_tfo->release_cmd(se_cmd);
2554 }
9b31a328
NB		 2555
2556 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2557 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2558 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2559
a17f091d
NB		 2560}
2561EXPORT_SYMBOL(target_wait_for_sess_cmds);
2562
b3eeea66 2563void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2564{
5277797d 2565 percpu_ref_kill(&lun->lun_ref);
5277797d 2566 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2567}
2568
d14921d6
NB		 2569/**
2570 * transport_wait_for_tasks - wait for completion to occur
2571 * @cmd: command to wait
c66ac9db 2572 *
d14921d6
NB		 2573 * Called from frontend fabric context to wait for storage engine
2574 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2575 */
a17f091d 2576bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2577{
2578 unsigned long flags;
2579
a1d8b49a 2580 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2581 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2582 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2583 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2584 return false;
d14921d6 2585 }
cb4f4d3c 2586
c8e31f26
AG		 2587 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2588 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2589 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2590 return false;
d14921d6 2591 }
7d680f3b 2592
3d28934a 2593 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2594 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2595 return false;
d14921d6 2596 }
c66ac9db 2597
7d680f3b 2598 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2599
649ee054
BVA		 2600 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d, t_state: %d, CMD_T_STOP\n",
2601 cmd, cmd->tag, cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2602
a1d8b49a 2603 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2604
a1d8b49a 2605 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2606
a1d8b49a 2607 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2608 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2609
649ee054
BVA		 2610 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->t_transport_stop_comp) for ITT: 0x%08llx\n",
2611 cmd->tag);
c66ac9db 2612
d14921d6 2613 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2614
2615 return true;
c66ac9db 2616}
d14921d6 2617EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2618
ab78fef4
BVA		 2619struct sense_info {
2620 u8 key;
2621 u8 asc;
2622 u8 ascq;
2623 bool add_sector_info;
2624};
2625
2626static const struct sense_info sense_info_table[] = {
2627 [TCM_NO_SENSE] = {
2628 .key = NOT_READY
2629 },
2630 [TCM_NON_EXISTENT_LUN] = {
2631 .key = ILLEGAL_REQUEST,
2632 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2633 },
2634 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2635 .key = ILLEGAL_REQUEST,
2636 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2637 },
2638 [TCM_SECTOR_COUNT_TOO_MANY] = {
2639 .key = ILLEGAL_REQUEST,
2640 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2641 },
2642 [TCM_UNKNOWN_MODE_PAGE] = {
2643 .key = ILLEGAL_REQUEST,
2644 .asc = 0x24, /* INVALID FIELD IN CDB */
2645 },
2646 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2647 .key = ABORTED_COMMAND,
2648 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2649 .ascq = 0x03,
2650 },
2651 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2652 .key = ABORTED_COMMAND,
2653 .asc = 0x0c, /* WRITE ERROR */
2654 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2655 },
2656 [TCM_INVALID_CDB_FIELD] = {
2657 .key = ILLEGAL_REQUEST,
2658 .asc = 0x24, /* INVALID FIELD IN CDB */
2659 },
2660 [TCM_INVALID_PARAMETER_LIST] = {
2661 .key = ILLEGAL_REQUEST,
2662 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2663 },
2664 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2665 .key = ILLEGAL_REQUEST,
2666 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2667 },
2668 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2669 .key = ILLEGAL_REQUEST,
2670 .asc = 0x0c, /* WRITE ERROR */
2671 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2672 },
2673 [TCM_SERVICE_CRC_ERROR] = {
2674 .key = ABORTED_COMMAND,
2675 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2676 .ascq = 0x05, /* N/A */
2677 },
2678 [TCM_SNACK_REJECTED] = {
2679 .key = ABORTED_COMMAND,
2680 .asc = 0x11, /* READ ERROR */
2681 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2682 },
2683 [TCM_WRITE_PROTECTED] = {
2684 .key = DATA_PROTECT,
2685 .asc = 0x27, /* WRITE PROTECTED */
2686 },
2687 [TCM_ADDRESS_OUT_OF_RANGE] = {
2688 .key = ILLEGAL_REQUEST,
2689 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2690 },
2691 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2692 .key = UNIT_ATTENTION,
2693 },
2694 [TCM_CHECK_CONDITION_NOT_READY] = {
2695 .key = NOT_READY,
2696 },
2697 [TCM_MISCOMPARE_VERIFY] = {
2698 .key = MISCOMPARE,
2699 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2700 .ascq = 0x00,
2701 },
2702 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2703 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2704 .asc = 0x10,
2705 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2706 .add_sector_info = true,
2707 },
2708 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2709 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2710 .asc = 0x10,
2711 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2712 .add_sector_info = true,
2713 },
2714 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2715 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2716 .asc = 0x10,
2717 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2718 .add_sector_info = true,
2719 },
2720 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2721 /*
2722 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2723 * Solaris initiators. Returning NOT READY instead means the
2724 * operations will be retried a finite number of times and we
2725 * can survive intermittent errors.
2726 */
2727 .key = NOT_READY,
2728 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2729 },
2730};
2731
f5a8b3a7 2732static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2733{
2734 const struct sense_info *si;
2735 u8 *buffer = cmd->sense_buffer;
2736 int r = (__force int)reason;
2737 u8 asc, ascq;
2738
2739 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2740 si = &sense_info_table[r];
2741 else
2742 si = &sense_info_table[(__force int)
2743 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2744
ab78fef4
BVA		 2745 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2746 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2747 WARN_ON_ONCE(asc == 0);
2748 } else if (si->asc == 0) {
2749 WARN_ON_ONCE(cmd->scsi_asc == 0);
2750 asc = cmd->scsi_asc;
2751 ascq = cmd->scsi_ascq;
2752 } else {
2753 asc = si->asc;
2754 ascq = si->ascq;
2755 }
9ec1e1ce
SG		 2756
2757 scsi_build_sense_buffer(0, buffer, si->key, asc, ascq);
ab78fef4 2758 if (si->add_sector_info)
f5a8b3a7
SG		 2759 return scsi_set_sense_information(buffer,
2760 cmd->scsi_sense_length,
2761 cmd->bad_sector);
2762
2763 return 0;
ab78fef4
BVA		 2764}
2765
de103c93
CH		 2766int
2767transport_send_check_condition_and_sense(struct se_cmd *cmd,
2768 sense_reason_t reason, int from_transport)
c66ac9db 2769{
c66ac9db 2770 unsigned long flags;
c66ac9db 2771
a1d8b49a 2772 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2773 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2774 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2775 return 0;
2776 }
2777 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2778 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2779
ab78fef4 2780 if (!from_transport) {
f5a8b3a7
SG		 2781 int rc;
2782
c66ac9db 2783 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 2784 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2785 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 2786 rc = translate_sense_reason(cmd, reason);
2787 if (rc)
2788 return rc;
c66ac9db 2789 }
c66ac9db 2790
e5c0d6ad 2791 trace_target_cmd_complete(cmd);
07bde79a 2792 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2793}
2794EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2795
2796int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2797{
c18bc7d8
RD		 2798 if (!(cmd->transport_state & CMD_T_ABORTED))
2799 return 0;
c66ac9db 2800
68259b5a
AL		 2801 /*
2802 * If cmd has been aborted but either no status is to be sent or it has
2803 * already been sent, just return
2804 */
2805 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
c18bc7d8 2806 return 1;
8b1e1244 2807
649ee054
BVA		 2808 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08llx\n",
2809 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2810
68259b5a 2811 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2812 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2813 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2814 cmd->se_tfo->queue_status(cmd);
2815
2816 return 1;
c66ac9db
NB		 2817}
2818EXPORT_SYMBOL(transport_check_aborted_status);
2819
2820void transport_send_task_abort(struct se_cmd *cmd)
2821{
c252f003
NB		 2822 unsigned long flags;
2823
2824 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2825 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2826 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2827 return;
2828 }
2829 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2830
c66ac9db
NB		 2831 /*
2832 * If there are still expected incoming fabric WRITEs, we wait
2833 * until until they have completed before sending a TASK_ABORTED
2834 * response. This response with TASK_ABORTED status will be
2835 * queued back to fabric module by transport_check_aborted_status().
2836 */
2837 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2838 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2839 cmd->transport_state |= CMD_T_ABORTED;
68259b5a 2840 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
29f4c090 2841 return;
c66ac9db
NB		 2842 }
2843 }
2844 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2845
72b59d6e
RD		 2846 transport_lun_remove_cmd(cmd);
2847
649ee054
BVA		 2848 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
2849 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2850
e5c0d6ad 2851 trace_target_cmd_complete(cmd);
e3d6f909 2852 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2853}
2854
af877292 2855static void target_tmr_work(struct work_struct *work)
c66ac9db 2856{
af877292 2857 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2858 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2859 struct se_tmr_req *tmr = cmd->se_tmr_req;
2860 int ret;
2861
2862 switch (tmr->function) {
5c6cd613 2863 case TMR_ABORT_TASK:
3d28934a 2864 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2865 break;
5c6cd613
NB		 2866 case TMR_ABORT_TASK_SET:
2867 case TMR_CLEAR_ACA:
2868 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2869 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2870 break;
5c6cd613 2871 case TMR_LUN_RESET:
c66ac9db
NB		 2872 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2873 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2874 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 2875 if (tmr->response == TMR_FUNCTION_COMPLETE) {
2876 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
2877 cmd->orig_fe_lun, 0x29,
2878 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
2879 }
c66ac9db 2880 break;
5c6cd613 2881 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2882 tmr->response = TMR_FUNCTION_REJECTED;
2883 break;
5c6cd613 2884 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2885 tmr->response = TMR_FUNCTION_REJECTED;
2886 break;
c66ac9db 2887 default:
6708bb27 2888 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2889 tmr->function);
2890 tmr->response = TMR_FUNCTION_REJECTED;
2891 break;
2892 }
2893
2894 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2895 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2896
b7b8bef7 2897 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2898}
2899
af877292
CH		 2900int transport_generic_handle_tmr(
2901 struct se_cmd *cmd)
c66ac9db 2902{
f15e9cd9
NB		 2903 unsigned long flags;
2904
2905 spin_lock_irqsave(&cmd->t_state_lock, flags);
2906 cmd->transport_state |= CMD_T_ACTIVE;
2907 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2908
af877292
CH		 2909 INIT_WORK(&cmd->work, target_tmr_work);
2910 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2911 return 0;
2912}
af877292 2913EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 2914
2915bool
2916target_check_wce(struct se_device *dev)
2917{
2918 bool wce = false;
2919
2920 if (dev->transport->get_write_cache)
2921 wce = dev->transport->get_write_cache(dev);
2922 else if (dev->dev_attrib.emulate_write_cache > 0)
2923 wce = true;
2924
2925 return wce;
2926}
2927
2928bool
2929target_check_fua(struct se_device *dev)
2930{
2931 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
2932}
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