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target: add support for START_STOP_UNIT SCSI opcode
[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
c72c5250
RD		 1091 if (cmd->data_direction == DMA_TO_DEVICE &&
1092 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1093 pr_err("Rejecting underflow/overflow 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);
568e1f65
JE		 1250 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1251 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1252 cmd->se_tfo->get_fabric_name(),
1253 cmd->se_sess->se_node_acl->initiatorname,
1254 cmd->t_task_cdb[0]);
de103c93
CH		 1255 if (ret)
1256 return ret;
1257
1258 ret = transport_check_alloc_task_attr(cmd);
1259 if (ret)
c66ac9db 1260 return ret;
cb4f4d3c 1261
cb4f4d3c 1262 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1263 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1264 return 0;
1265}
a12f41f8 1266EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1267
695434e1
NB		 1268/*
1269 * Used by fabric module frontends to queue tasks directly.
1270 * Many only be used from process context only
1271 */
1272int transport_handle_cdb_direct(
1273 struct se_cmd *cmd)
1274{
de103c93 1275 sense_reason_t ret;
dd8ae59d 1276
695434e1
NB		 1277 if (!cmd->se_lun) {
1278 dump_stack();
6708bb27 1279 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1280 return -EINVAL;
1281 }
1282 if (in_interrupt()) {
1283 dump_stack();
6708bb27 1284 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1285 " from interrupt context\n");
1286 return -EINVAL;
1287 }
dd8ae59d 1288 /*
af877292
CH		 1289 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1290 * outstanding descriptors are handled correctly during shutdown via
1291 * transport_wait_for_tasks()
dd8ae59d
NB		 1292 *
1293 * Also, we don't take cmd->t_state_lock here as we only expect
1294 * this to be called for initial descriptor submission.
1295 */
1296 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1297 cmd->transport_state |= CMD_T_ACTIVE;
1298
dd8ae59d
NB		 1299 /*
1300 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1301 * so follow TRANSPORT_NEW_CMD processing thread context usage
1302 * and call transport_generic_request_failure() if necessary..
1303 */
1304 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1305 if (ret)
1306 transport_generic_request_failure(cmd, ret);
dd8ae59d 1307 return 0;
695434e1
NB		 1308}
1309EXPORT_SYMBOL(transport_handle_cdb_direct);
1310
c5ff8d6b 1311sense_reason_t
de103c93
CH		 1312transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1313 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1314{
1315 if (!sgl || !sgl_count)
1316 return 0;
1317
1318 /*
1319 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1320 * scatterlists already have been set to follow what the fabric
1321 * passes for the original expected data transfer length.
1322 */
1323 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1324 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1325 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1326 return TCM_INVALID_CDB_FIELD;
1327 }
1328
1329 cmd->t_data_sg = sgl;
1330 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1331 cmd->t_bidi_data_sg = sgl_bidi;
1332 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1333
de103c93
CH		 1334 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1335 return 0;
1336}
1337
a026757f
NB		 1338/*
1339 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1340 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1341 *
1342 * @se_cmd: command descriptor to submit
1343 * @se_sess: associated se_sess for endpoint
1344 * @cdb: pointer to SCSI CDB
1345 * @sense: pointer to SCSI sense buffer
1346 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1347 * @data_length: fabric expected data transfer length
1348 * @task_addr: SAM task attribute
1349 * @data_dir: DMA data direction
1350 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1351 * @sgl: struct scatterlist memory for unidirectional mapping
1352 * @sgl_count: scatterlist count for unidirectional mapping
1353 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1354 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1355 * @sgl_prot: struct scatterlist memory protection information
1356 * @sgl_prot_count: scatterlist count for protection information
a6360785 1357 *
649ee054
BVA		 1358 * Task tags are supported if the caller has set @se_cmd->tag.
1359 *
d6dfc868
RD		 1360 * Returns non zero to signal active I/O shutdown failure. All other
1361 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1362 * but still return zero here.
1363 *
a6360785
NB		 1364 * This may only be called from process context, and also currently
1365 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1366 */
1367int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1368 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1369 u32 data_length, int task_attr, int data_dir, int flags,
1370 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1371 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1372 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1373{
1374 struct se_portal_group *se_tpg;
de103c93
CH		 1375 sense_reason_t rc;
1376 int ret;
a6360785
NB		 1377
1378 se_tpg = se_sess->se_tpg;
1379 BUG_ON(!se_tpg);
1380 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1381 BUG_ON(in_interrupt());
1382 /*
1383 * Initialize se_cmd for target operation. From this point
1384 * exceptions are handled by sending exception status via
1385 * target_core_fabric_ops->queue_status() callback
1386 */
1387 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1388 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1389 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1390 se_cmd->unknown_data_length = 1;
a6360785
NB		 1391 /*
1392 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1393 * se_sess->sess_cmd_list. A second kref_get here is necessary
1394 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1395 * kref_put() to happen during fabric packet acknowledgement.
1396 */
afc16604 1397 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1398 if (ret)
1399 return ret;
a6360785
NB		 1400 /*
1401 * Signal bidirectional data payloads to target-core
1402 */
1403 if (flags & TARGET_SCF_BIDI_OP)
1404 se_cmd->se_cmd_flags |= SCF_BIDI;
1405 /*
1406 * Locate se_lun pointer and attach it to struct se_cmd
1407 */
de103c93
CH		 1408 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1409 if (rc) {
1410 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1411 target_put_sess_cmd(se_cmd);
d6dfc868 1412 return 0;
735703ca 1413 }
b5b8e298
SG		 1414
1415 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1416 if (rc != 0) {
1417 transport_generic_request_failure(se_cmd, rc);
1418 return 0;
1419 }
1420
def2b339
NB		 1421 /*
1422 * Save pointers for SGLs containing protection information,
1423 * if present.
1424 */
1425 if (sgl_prot_count) {
1426 se_cmd->t_prot_sg = sgl_prot;
1427 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1428 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1429 }
d6e0175c 1430
a026757f
NB		 1431 /*
1432 * When a non zero sgl_count has been passed perform SGL passthrough
1433 * mapping for pre-allocated fabric memory instead of having target
1434 * core perform an internal SGL allocation..
1435 */
1436 if (sgl_count != 0) {
1437 BUG_ON(!sgl);
1438
944981c7
NB		 1439 /*
1440 * A work-around for tcm_loop as some userspace code via
1441 * scsi-generic do not memset their associated read buffers,
1442 * so go ahead and do that here for type non-data CDBs. Also
1443 * note that this is currently guaranteed to be a single SGL
1444 * for this case by target core in target_setup_cmd_from_cdb()
1445 * -> transport_generic_cmd_sequencer().
1446 */
1447 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1448 se_cmd->data_direction == DMA_FROM_DEVICE) {
1449 unsigned char *buf = NULL;
1450
1451 if (sgl)
1452 buf = kmap(sg_page(sgl)) + sgl->offset;
1453
1454 if (buf) {
1455 memset(buf, 0, sgl->length);
1456 kunmap(sg_page(sgl));
1457 }
1458 }
1459
a026757f
NB		 1460 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1461 sgl_bidi, sgl_bidi_count);
1462 if (rc != 0) {
de103c93 1463 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1464 return 0;
1465 }
1466 }
def2b339 1467
11e319ed
AG		 1468 /*
1469 * Check if we need to delay processing because of ALUA
1470 * Active/NonOptimized primary access state..
1471 */
1472 core_alua_check_nonop_delay(se_cmd);
1473
a6360785 1474 transport_handle_cdb_direct(se_cmd);
d6dfc868 1475 return 0;
a6360785 1476}
a026757f
NB		 1477EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1478
1479/*
1480 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1481 *
1482 * @se_cmd: command descriptor to submit
1483 * @se_sess: associated se_sess for endpoint
1484 * @cdb: pointer to SCSI CDB
1485 * @sense: pointer to SCSI sense buffer
1486 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1487 * @data_length: fabric expected data transfer length
1488 * @task_addr: SAM task attribute
1489 * @data_dir: DMA data direction
1490 * @flags: flags for command submission from target_sc_flags_tables
1491 *
649ee054
BVA		 1492 * Task tags are supported if the caller has set @se_cmd->tag.
1493 *
a026757f
NB		 1494 * Returns non zero to signal active I/O shutdown failure. All other
1495 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1496 * but still return zero here.
1497 *
1498 * This may only be called from process context, and also currently
1499 * assumes internal allocation of fabric payload buffer by target-core.
1500 *
1501 * It also assumes interal target core SGL memory allocation.
1502 */
1503int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1504 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1505 u32 data_length, int task_attr, int data_dir, int flags)
1506{
1507 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1508 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1509 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1510}
a6360785
NB		 1511EXPORT_SYMBOL(target_submit_cmd);
1512
9f0d05c2
NB		 1513static void target_complete_tmr_failure(struct work_struct *work)
1514{
1515 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1516
1517 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1518 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1519
1520 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1521}
1522
ea98d7f9
AG		 1523/**
1524 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1525 * for TMR CDBs
1526 *
1527 * @se_cmd: command descriptor to submit
1528 * @se_sess: associated se_sess for endpoint
1529 * @sense: pointer to SCSI sense buffer
1530 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1531 * @fabric_context: fabric context for TMR req
1532 * @tm_type: Type of TM request
c0974f89
NB		 1533 * @gfp: gfp type for caller
1534 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1535 * @flags: submit cmd flags
ea98d7f9
AG		 1536 *
1537 * Callable from all contexts.
1538 **/
1539
c7042cae 1540int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1541 unsigned char *sense, u64 unpacked_lun,
c0974f89
NB		 1542 void *fabric_tmr_ptr, unsigned char tm_type,
1543 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1544{
1545 struct se_portal_group *se_tpg;
1546 int ret;
1547
1548 se_tpg = se_sess->se_tpg;
1549 BUG_ON(!se_tpg);
1550
1551 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1552 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1553 /*
1554 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1555 * allocation failure.
1556 */
c0974f89 1557 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1558 if (ret < 0)
1559 return -ENOMEM;
ea98d7f9 1560
c0974f89
NB		 1561 if (tm_type == TMR_ABORT_TASK)
1562 se_cmd->se_tmr_req->ref_task_tag = tag;
1563
ea98d7f9 1564 /* See target_submit_cmd for commentary */
afc16604 1565 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1566 if (ret) {
1567 core_tmr_release_req(se_cmd->se_tmr_req);
1568 return ret;
1569 }
ea98d7f9 1570
ea98d7f9
AG		 1571 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1572 if (ret) {
9f0d05c2
NB		 1573 /*
1574 * For callback during failure handling, push this work off
1575 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1576 */
1577 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1578 schedule_work(&se_cmd->work);
c7042cae 1579 return 0;
ea98d7f9
AG		 1580 }
1581 transport_generic_handle_tmr(se_cmd);
c7042cae 1582 return 0;
ea98d7f9
AG		 1583}
1584EXPORT_SYMBOL(target_submit_tmr);
1585
cdbb70bb 1586/*
cf572a96 1587 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1588 * has completed.
1589 */
cf572a96 1590bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cb0df4d3
BVA		 1591 __releases(&cmd->t_state_lock)
1592 __acquires(&cmd->t_state_lock)
cdbb70bb 1593{
cdbb70bb
CH		 1594 bool was_active = false;
1595
cf572a96
CH		 1596 if (cmd->transport_state & CMD_T_BUSY) {
1597 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1598 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1599
cf572a96
CH		 1600 pr_debug("cmd %p waiting to complete\n", cmd);
1601 wait_for_completion(&cmd->task_stop_comp);
1602 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1603
1604 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1605 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1606 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1607 was_active = true;
1608 }
1609
cdbb70bb
CH		 1610 return was_active;
1611}
1612
c66ac9db
NB		 1613/*
1614 * Handle SAM-esque emulation for generic transport request failures.
1615 */
de103c93
CH		 1616void transport_generic_request_failure(struct se_cmd *cmd,
1617 sense_reason_t sense_reason)
c66ac9db 1618{
07bde79a
NB		 1619 int ret = 0;
1620
649ee054
BVA		 1621 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1622 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1623 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1624 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1625 cmd->t_state, sense_reason);
d43d6aea 1626 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1627 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1628 (cmd->transport_state & CMD_T_STOP) != 0,
1629 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1630
c66ac9db
NB		 1631 /*
1632 * For SAM Task Attribute emulation for failed struct se_cmd
1633 */
019c4ca6 1634 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1635 /*
1636 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1637 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1638 */
1639 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1640 cmd->transport_complete_callback)
c8e63985 1641 cmd->transport_complete_callback(cmd, false);
c66ac9db 1642
de103c93 1643 switch (sense_reason) {
03e98c9e
NB		 1644 case TCM_NON_EXISTENT_LUN:
1645 case TCM_UNSUPPORTED_SCSI_OPCODE:
1646 case TCM_INVALID_CDB_FIELD:
1647 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1648 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1649 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1650 case TCM_UNKNOWN_MODE_PAGE:
1651 case TCM_WRITE_PROTECTED:
e2397c70 1652 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1653 case TCM_CHECK_CONDITION_ABORT_CMD:
1654 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1655 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1656 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1657 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1658 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1659 break;
de103c93
CH		 1660 case TCM_OUT_OF_RESOURCES:
1661 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1662 break;
03e98c9e 1663 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1664 /*
1665 * No SENSE Data payload for this case, set SCSI Status
1666 * and queue the response to $FABRIC_MOD.
1667 *
1668 * Uses linux/include/scsi/scsi.h SAM status codes defs
1669 */
1670 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1671 /*
1672 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1673 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1674 * CONFLICT STATUS.
1675 *
1676 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1677 */
e3d6f909 1678 if (cmd->se_sess &&
c51c8e7b
HR		 1679 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1680 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1681 cmd->orig_fe_lun, 0x2C,
1682 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1683 }
e5c0d6ad 1684 trace_target_cmd_complete(cmd);
c51c8e7b 1685 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1686 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1687 goto queue_full;
c66ac9db 1688 goto check_stop;
c66ac9db 1689 default:
6708bb27 1690 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1691 cmd->t_task_cdb[0], sense_reason);
1692 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1693 break;
1694 }
f3146437 1695
de103c93 1696 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1697 if (ret == -EAGAIN || ret == -ENOMEM)
1698 goto queue_full;
07bde79a 1699
c66ac9db
NB		 1700check_stop:
1701 transport_lun_remove_cmd(cmd);
6708bb27 1702 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1703 ;
07bde79a
NB		 1704 return;
1705
1706queue_full:
e057f533
CH		 1707 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1708 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1709}
2fbff127 1710EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1711
76dde50e 1712void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1713{
de103c93 1714 sense_reason_t ret;
5f41a31d 1715
de103c93
CH		 1716 if (cmd->execute_cmd) {
1717 ret = cmd->execute_cmd(cmd);
1718 if (ret) {
1719 spin_lock_irq(&cmd->t_state_lock);
1720 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1721 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1722
de103c93
CH		 1723 transport_generic_request_failure(cmd, ret);
1724 }
5f41a31d
CH		 1725 }
1726}
1727
aa58b531
NB		 1728static int target_write_prot_action(struct se_cmd *cmd)
1729{
5132d1e6 1730 u32 sectors;
aa58b531
NB		 1731 /*
1732 * Perform WRITE_INSERT of PI using software emulation when backend
1733 * device has PI enabled, if the transport has not already generated
1734 * PI using hardware WRITE_INSERT offload.
1735 */
1736 switch (cmd->prot_op) {
1737 case TARGET_PROT_DOUT_INSERT:
1738 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1739 sbc_dif_generate(cmd);
1740 break;
5132d1e6
NB		 1741 case TARGET_PROT_DOUT_STRIP:
1742 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1743 break;
1744
1745 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1746 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1747 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1748 if (unlikely(cmd->pi_err)) {
1749 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1750 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1751 spin_unlock_irq(&cmd->t_state_lock);
1752 transport_generic_request_failure(cmd, cmd->pi_err);
1753 return -1;
1754 }
1755 break;
aa58b531
NB		 1756 default:
1757 break;
1758 }
1759
1760 return 0;
1761}
1762
019c4ca6 1763static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1764{
1765 struct se_device *dev = cmd->se_dev;
1766
a3541703 1767 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1768 return false;
5f41a31d 1769
c66ac9db 1770 /*
25985edc 1771 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1772 * to allow the passed struct se_cmd list of tasks to the front of the list.
1773 */
5f41a31d 1774 switch (cmd->sam_task_attr) {
68d81f40 1775 case TCM_HEAD_TAG:
5f41a31d
CH		 1776 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1777 "se_ordered_id: %u\n",
1778 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1779 return false;
68d81f40 1780 case TCM_ORDERED_TAG:
33940d09 1781 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1782
5f41a31d
CH		 1783 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1784 " se_ordered_id: %u\n",
1785 cmd->t_task_cdb[0], cmd->se_ordered_id);
1786
c66ac9db 1787 /*
5f41a31d
CH		 1788 * Execute an ORDERED command if no other older commands
1789 * exist that need to be completed first.
c66ac9db 1790 */
5f41a31d 1791 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1792 return false;
5f41a31d
CH		 1793 break;
1794 default:
c66ac9db
NB		 1795 /*
1796 * For SIMPLE and UNTAGGED Task Attribute commands
1797 */
33940d09 1798 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1799 break;
c66ac9db 1800 }
5f41a31d 1801
019c4ca6
CH		 1802 if (atomic_read(&dev->dev_ordered_sync) == 0)
1803 return false;
c66ac9db 1804
019c4ca6
CH		 1805 spin_lock(&dev->delayed_cmd_lock);
1806 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1807 spin_unlock(&dev->delayed_cmd_lock);
1808
1809 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1810 " delayed CMD list, se_ordered_id: %u\n",
1811 cmd->t_task_cdb[0], cmd->sam_task_attr,
1812 cmd->se_ordered_id);
1813 return true;
1814}
1815
1816void target_execute_cmd(struct se_cmd *cmd)
1817{
1818 /*
1819 * If the received CDB has aleady been aborted stop processing it here.
1820 */
4a9a6c8d 1821 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1822 return;
c66ac9db 1823
019c4ca6
CH		 1824 /*
1825 * Determine if frontend context caller is requesting the stopping of
1826 * this command for frontend exceptions.
1827 */
4a9a6c8d 1828 spin_lock_irq(&cmd->t_state_lock);
019c4ca6 1829 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1830 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1831 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1832
1833 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1834 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1835 return;
1836 }
1837
1838 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1839 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1840 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1841
1842 if (target_write_prot_action(cmd))
1843 return;
019c4ca6 1844
1a398b97
NB		 1845 if (target_handle_task_attr(cmd)) {
1846 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1847 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1848 spin_unlock_irq(&cmd->t_state_lock);
1849 return;
1850 }
1851
1852 __target_execute_cmd(cmd);
c66ac9db 1853}
70baf0ab 1854EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1855
5f41a31d
CH		 1856/*
1857 * Process all commands up to the last received ORDERED task attribute which
1858 * requires another blocking boundary
1859 */
1860static void target_restart_delayed_cmds(struct se_device *dev)
1861{
1862 for (;;) {
1863 struct se_cmd *cmd;
1864
1865 spin_lock(&dev->delayed_cmd_lock);
1866 if (list_empty(&dev->delayed_cmd_list)) {
1867 spin_unlock(&dev->delayed_cmd_lock);
1868 break;
1869 }
1870
1871 cmd = list_entry(dev->delayed_cmd_list.next,
1872 struct se_cmd, se_delayed_node);
1873 list_del(&cmd->se_delayed_node);
1874 spin_unlock(&dev->delayed_cmd_lock);
1875
1876 __target_execute_cmd(cmd);
1877
68d81f40 1878 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1879 break;
1880 }
1881}
1882
c66ac9db 1883/*
35e0e757 1884 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1885 * and ordered cmds need to have their tasks added to the execution queue.
1886 */
1887static void transport_complete_task_attr(struct se_cmd *cmd)
1888{
5951146d 1889 struct se_device *dev = cmd->se_dev;
c66ac9db 1890
a3541703 1891 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1892 return;
1893
68d81f40 1894 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1895 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1896 dev->dev_cur_ordered_id++;
6708bb27 1897 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1898 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1899 cmd->se_ordered_id);
68d81f40 1900 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1901 dev->dev_cur_ordered_id++;
6708bb27 1902 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1903 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1904 cmd->se_ordered_id);
68d81f40 1905 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1906 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1907
1908 dev->dev_cur_ordered_id++;
6708bb27 1909 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1910 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1911 }
c66ac9db 1912
5f41a31d 1913 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1914}
1915
e057f533 1916static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1917{
1918 int ret = 0;
1919
019c4ca6 1920 transport_complete_task_attr(cmd);
e057f533
CH		 1921
1922 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1923 trace_target_cmd_complete(cmd);
e057f533 1924 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1925 goto out;
e057f533 1926 }
07bde79a
NB		 1927
1928 switch (cmd->data_direction) {
1929 case DMA_FROM_DEVICE:
e5c0d6ad 1930 trace_target_cmd_complete(cmd);
07bde79a
NB		 1931 ret = cmd->se_tfo->queue_data_in(cmd);
1932 break;
1933 case DMA_TO_DEVICE:
64577407 1934 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1935 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 1936 break;
07bde79a
NB		 1937 }
1938 /* Fall through for DMA_TO_DEVICE */
1939 case DMA_NONE:
e5c0d6ad 1940 trace_target_cmd_complete(cmd);
07bde79a
NB		 1941 ret = cmd->se_tfo->queue_status(cmd);
1942 break;
1943 default:
1944 break;
1945 }
1946
e057f533
CH		 1947out:
1948 if (ret < 0) {
1949 transport_handle_queue_full(cmd, cmd->se_dev);
1950 return;
1951 }
1952 transport_lun_remove_cmd(cmd);
1953 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1954}
1955
1956static void transport_handle_queue_full(
1957 struct se_cmd *cmd,
e057f533 1958 struct se_device *dev)
07bde79a
NB		 1959{
1960 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 1961 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 1962 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 1963 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1964
1965 schedule_work(&cmd->se_dev->qf_work_queue);
1966}
1967
fdeab852 1968static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 1969{
fdeab852
NB		 1970 switch (cmd->prot_op) {
1971 case TARGET_PROT_DIN_STRIP:
1972 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 1973 u32 sectors = cmd->data_length >>
1974 ilog2(cmd->se_dev->dev_attrib.block_size);
1975
1976 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1977 sectors, 0, cmd->t_prot_sg,
1978 0);
1979 if (cmd->pi_err)
fdeab852 1980 return true;
bc005869 1981 }
fdeab852 1982 break;
72c03850
NB		 1983 case TARGET_PROT_DIN_INSERT:
1984 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
1985 break;
1986
1987 sbc_dif_generate(cmd);
1988 break;
fdeab852
NB		 1989 default:
1990 break;
bc005869
NB		 1991 }
1992
1993 return false;
1994}
1995
35e0e757 1996static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1997{
35e0e757 1998 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1999 int ret;
35e0e757 2000
c66ac9db
NB		 2001 /*
2002 * Check if we need to move delayed/dormant tasks from cmds on the
2003 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2004 * Attribute.
2005 */
019c4ca6
CH		 2006 transport_complete_task_attr(cmd);
2007
07bde79a
NB		 2008 /*
2009 * Check to schedule QUEUE_FULL work, or execute an existing
2010 * cmd->transport_qf_callback()
2011 */
2012 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2013 schedule_work(&cmd->se_dev->qf_work_queue);
2014
c66ac9db 2015 /*
d5829eac 2016 * Check if we need to send a sense buffer from
c66ac9db
NB		 2017 * the struct se_cmd in question.
2018 */
2019 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2020 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2021 ret = transport_send_check_condition_and_sense(
2022 cmd, 0, 1);
2023 if (ret == -EAGAIN || ret == -ENOMEM)
2024 goto queue_full;
2025
2026 transport_lun_remove_cmd(cmd);
2027 transport_cmd_check_stop_to_fabric(cmd);
2028 return;
c66ac9db
NB		 2029 }
2030 /*
25985edc 2031 * Check for a callback, used by amongst other things
a6b0133c 2032 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2033 */
a6b0133c
NB		 2034 if (cmd->transport_complete_callback) {
2035 sense_reason_t rc;
2036
c8e63985 2037 rc = cmd->transport_complete_callback(cmd, true);
a2890087 2038 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
c8e63985
NB		 2039 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2040 !cmd->data_length)
2041 goto queue_rsp;
2042
a6b0133c 2043 return;
a2890087
NB		 2044 } else if (rc) {
2045 ret = transport_send_check_condition_and_sense(cmd,
2046 rc, 0);
2047 if (ret == -EAGAIN || ret == -ENOMEM)
2048 goto queue_full;
a6b0133c 2049
a2890087
NB		 2050 transport_lun_remove_cmd(cmd);
2051 transport_cmd_check_stop_to_fabric(cmd);
2052 return;
2053 }
a6b0133c 2054 }
c66ac9db 2055
c8e63985 2056queue_rsp:
c66ac9db
NB		 2057 switch (cmd->data_direction) {
2058 case DMA_FROM_DEVICE:
4cc987ea
NB		 2059 atomic_long_add(cmd->data_length,
2060 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2061 /*
2062 * Perform READ_STRIP of PI using software emulation when
2063 * backend had PI enabled, if the transport will not be
2064 * performing hardware READ_STRIP offload.
2065 */
fdeab852 2066 if (target_read_prot_action(cmd)) {
bc005869
NB		 2067 ret = transport_send_check_condition_and_sense(cmd,
2068 cmd->pi_err, 0);
2069 if (ret == -EAGAIN || ret == -ENOMEM)
2070 goto queue_full;
2071
2072 transport_lun_remove_cmd(cmd);
2073 transport_cmd_check_stop_to_fabric(cmd);
2074 return;
2075 }
c66ac9db 2076
e5c0d6ad 2077 trace_target_cmd_complete(cmd);
07bde79a 2078 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2079 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2080 goto queue_full;
c66ac9db
NB		 2081 break;
2082 case DMA_TO_DEVICE:
4cc987ea
NB		 2083 atomic_long_add(cmd->data_length,
2084 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2085 /*
2086 * Check if we need to send READ payload for BIDI-COMMAND
2087 */
64577407 2088 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2089 atomic_long_add(cmd->data_length,
2090 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2091 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2092 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2093 goto queue_full;
c66ac9db
NB		 2094 break;
2095 }
2096 /* Fall through for DMA_TO_DEVICE */
2097 case DMA_NONE:
e5c0d6ad 2098 trace_target_cmd_complete(cmd);
07bde79a 2099 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2100 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2101 goto queue_full;
c66ac9db
NB		 2102 break;
2103 default:
2104 break;
2105 }
2106
2107 transport_lun_remove_cmd(cmd);
2108 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2109 return;
2110
2111queue_full:
6708bb27 2112 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2113 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2114 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2115 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2116}
2117
6708bb27 2118static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2119{
ec98f782 2120 struct scatterlist *sg;
ec98f782 2121 int count;
c66ac9db 2122
6708bb27
AG		 2123 for_each_sg(sgl, sg, nents, count)
2124 __free_page(sg_page(sg));
c66ac9db 2125
6708bb27
AG		 2126 kfree(sgl);
2127}
c66ac9db 2128
47e459e6
NB		 2129static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2130{
2131 /*
2132 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2133 * emulation, and free + reset pointers if necessary..
2134 */
2135 if (!cmd->t_data_sg_orig)
2136 return;
2137
2138 kfree(cmd->t_data_sg);
2139 cmd->t_data_sg = cmd->t_data_sg_orig;
2140 cmd->t_data_sg_orig = NULL;
2141 cmd->t_data_nents = cmd->t_data_nents_orig;
2142 cmd->t_data_nents_orig = 0;
2143}
2144
6708bb27
AG		 2145static inline void transport_free_pages(struct se_cmd *cmd)
2146{
5835812f
AM		 2147 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2148 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2149 cmd->t_prot_sg = NULL;
2150 cmd->t_prot_nents = 0;
2151 }
2152
47e459e6 2153 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2154 /*
2155 * Release special case READ buffer payload required for
2156 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2157 */
2158 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2159 transport_free_sgl(cmd->t_bidi_data_sg,
2160 cmd->t_bidi_data_nents);
2161 cmd->t_bidi_data_sg = NULL;
2162 cmd->t_bidi_data_nents = 0;
2163 }
47e459e6 2164 transport_reset_sgl_orig(cmd);
6708bb27 2165 return;
47e459e6
NB		 2166 }
2167 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2168
2169 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2170 cmd->t_data_sg = NULL;
2171 cmd->t_data_nents = 0;
c66ac9db 2172
6708bb27 2173 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2174 cmd->t_bidi_data_sg = NULL;
2175 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2176}
2177
e26d99ae
CH		 2178/**
2179 * transport_release_cmd - free a command
2180 * @cmd: command to free
2181 *
2182 * This routine unconditionally frees a command, and reference counting
2183 * or list removal must be done in the caller.
2184 */
d5ddad41 2185static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2186{
2187 BUG_ON(!cmd->se_tfo);
2188
c8e31f26 2189 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2190 core_tmr_release_req(cmd->se_tmr_req);
2191 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2192 kfree(cmd->t_task_cdb);
2193 /*
7481deb4
NB		 2194 * If this cmd has been setup with target_get_sess_cmd(), drop
2195 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2196 */
afc16604 2197 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2198}
2199
d3df7825
CH		 2200/**
2201 * transport_put_cmd - release a reference to a command
2202 * @cmd: command to release
2203 *
2204 * This routine releases our reference to the command and frees it if possible.
2205 */
d5ddad41 2206static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2207{
c66ac9db 2208 transport_free_pages(cmd);
d5ddad41 2209 return transport_release_cmd(cmd);
c66ac9db 2210}
c66ac9db 2211
4949314c 2212void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2213{
ec98f782 2214 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2215 struct page **pages;
2216 int i;
05d1c7c0
AG		 2217
2218 /*
ec98f782
AG		 2219 * We need to take into account a possible offset here for fabrics like
2220 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2221 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2222 */
4949314c
AG		 2223 if (!cmd->t_data_nents)
2224 return NULL;
3717ef0c
PB		 2225
2226 BUG_ON(!sg);
2227 if (cmd->t_data_nents == 1)
4949314c
AG		 2228 return kmap(sg_page(sg)) + sg->offset;
2229
2230 /* >1 page. use vmap */
2231 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2232 if (!pages)
4949314c
AG		 2233 return NULL;
2234
2235 /* convert sg[] to pages[] */
2236 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2237 pages[i] = sg_page(sg);
2238 }
2239
2240 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2241 kfree(pages);
de103c93 2242 if (!cmd->t_data_vmap)
4949314c
AG		 2243 return NULL;
2244
2245 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2246}
4949314c 2247EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2248
4949314c 2249void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2250{
a1edf9cf 2251 if (!cmd->t_data_nents) {
4949314c 2252 return;
a1edf9cf 2253 } else if (cmd->t_data_nents == 1) {
4949314c 2254 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2255 return;
2256 }
4949314c
AG		 2257
2258 vunmap(cmd->t_data_vmap);
2259 cmd->t_data_vmap = NULL;
05d1c7c0 2260}
4949314c 2261EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2262
c5ff8d6b 2263int
20093994
NB		 2264target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2265 bool zero_page)
c66ac9db 2266{
20093994 2267 struct scatterlist *sg;
ec98f782 2268 struct page *page;
20093994
NB		 2269 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2270 unsigned int nent;
ec98f782 2271 int i = 0;
c66ac9db 2272
20093994
NB		 2273 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2274 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2275 if (!sg)
ec98f782 2276 return -ENOMEM;
c66ac9db 2277
20093994 2278 sg_init_table(sg, nent);
9db9da33 2279
ec98f782
AG		 2280 while (length) {
2281 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2282 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2283 if (!page)
2284 goto out;
c66ac9db 2285
20093994 2286 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2287 length -= page_len;
2288 i++;
c66ac9db 2289 }
20093994
NB		 2290 *sgl = sg;
2291 *nents = nent;
c66ac9db 2292 return 0;
c66ac9db 2293
ec98f782 2294out:
d0e27c88 2295 while (i > 0) {
ec98f782 2296 i--;
20093994 2297 __free_page(sg_page(&sg[i]));
c66ac9db 2298 }
20093994 2299 kfree(sg);
ec98f782 2300 return -ENOMEM;
c66ac9db
NB		 2301}
2302
da0f7619 2303/*
b16a35b0
AG		 2304 * Allocate any required resources to execute the command. For writes we
2305 * might not have the payload yet, so notify the fabric via a call to
2306 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2307 */
de103c93
CH		 2308sense_reason_t
2309transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2310{
c66ac9db 2311 int ret = 0;
c8e63985 2312 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2313
5835812f
AM		 2314 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2315 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2316 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2317 cmd->prot_length, true);
2318 if (ret < 0)
2319 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2320 }
2321
c66ac9db
NB		 2322 /*
2323 * Determine is the TCM fabric module has already allocated physical
2324 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2325 * beforehand.
c66ac9db 2326 */
ec98f782
AG		 2327 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2328 cmd->data_length) {
20093994 2329
8cefe07b
NB		 2330 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2331 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2332 u32 bidi_length;
2333
2334 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2335 bidi_length = cmd->t_task_nolb *
2336 cmd->se_dev->dev_attrib.block_size;
2337 else
2338 bidi_length = cmd->data_length;
2339
2340 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2341 &cmd->t_bidi_data_nents,
2342 bidi_length, zero_flag);
2343 if (ret < 0)
2344 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2345 }
2346
20093994
NB		 2347 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2348 cmd->data_length, zero_flag);
c66ac9db 2349 if (ret < 0)
de103c93 2350 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2351 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2352 cmd->data_length) {
2353 /*
2354 * Special case for COMPARE_AND_WRITE with fabrics
2355 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2356 */
2357 u32 caw_length = cmd->t_task_nolb *
2358 cmd->se_dev->dev_attrib.block_size;
2359
2360 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2361 &cmd->t_bidi_data_nents,
2362 caw_length, zero_flag);
2363 if (ret < 0)
2364 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2365 }
c66ac9db 2366 /*
c3196f0c
CH		 2367 * If this command is not a write we can execute it right here,
2368 * for write buffers we need to notify the fabric driver first
2369 * and let it call back once the write buffers are ready.
c66ac9db 2370 */
5f41a31d 2371 target_add_to_state_list(cmd);
885e7b0e 2372 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2373 target_execute_cmd(cmd);
2374 return 0;
2375 }
862e6389 2376 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2377
2378 ret = cmd->se_tfo->write_pending(cmd);
2379 if (ret == -EAGAIN || ret == -ENOMEM)
2380 goto queue_full;
2381
de103c93
CH		 2382 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2383 WARN_ON(ret);
2384
b69c1fcf 2385 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2386
c3196f0c
CH		 2387queue_full:
2388 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2389 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2390 transport_handle_queue_full(cmd, cmd->se_dev);
2391 return 0;
c66ac9db 2392}
a1d8b49a 2393EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2394
e057f533 2395static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2396{
f147abb4
NB		 2397 int ret;
2398
2399 ret = cmd->se_tfo->write_pending(cmd);
2400 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2401 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2402 cmd);
2403 transport_handle_queue_full(cmd, cmd->se_dev);
2404 }
07bde79a
NB		 2405}
2406
d5ddad41 2407int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2408{
c130480b 2409 unsigned long flags;
d5ddad41
NB		 2410 int ret = 0;
2411
d14921d6 2412 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2413 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2414 transport_wait_for_tasks(cmd);
2415
d5ddad41 2416 ret = transport_release_cmd(cmd);
d14921d6
NB		 2417 } else {
2418 if (wait_for_tasks)
2419 transport_wait_for_tasks(cmd);
c130480b
NB		 2420 /*
2421 * Handle WRITE failure case where transport_generic_new_cmd()
2422 * has already added se_cmd to state_list, but fabric has
2423 * failed command before I/O submission.
2424 */
2425 if (cmd->state_active) {
2426 spin_lock_irqsave(&cmd->t_state_lock, flags);
2427 target_remove_from_state_list(cmd);
2428 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2429 }
d14921d6 2430
82f1c8a4 2431 if (cmd->se_lun)
c66ac9db 2432 transport_lun_remove_cmd(cmd);
c66ac9db 2433
d5ddad41 2434 ret = transport_put_cmd(cmd);
c66ac9db 2435 }
d5ddad41 2436 return ret;
c66ac9db
NB		 2437}
2438EXPORT_SYMBOL(transport_generic_free_cmd);
2439
a17f091d 2440/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2441 * @se_cmd: command descriptor to add
a6360785 2442 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2443 */
afc16604 2444int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2445{
afc16604 2446 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2447 unsigned long flags;
bc187ea6 2448 int ret = 0;
a17f091d 2449
a6360785
NB		 2450 /*
2451 * Add a second kref if the fabric caller is expecting to handle
2452 * fabric acknowledgement that requires two target_put_sess_cmd()
2453 * invocations before se_cmd descriptor release.
2454 */
054922bb 2455 if (ack_kref)
a6360785 2456 kref_get(&se_cmd->cmd_kref);
7481deb4 2457
a17f091d 2458 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2459 if (se_sess->sess_tearing_down) {
2460 ret = -ESHUTDOWN;
2461 goto out;
2462 }
a17f091d 2463 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2464out:
a17f091d 2465 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2466
2467 if (ret && ack_kref)
afc16604 2468 target_put_sess_cmd(se_cmd);
7544e597 2469
bc187ea6 2470 return ret;
a17f091d 2471}
20361e69 2472EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2473
7481deb4 2474static void target_release_cmd_kref(struct kref *kref)
077aa3b2 2475 __releases(&se_cmd->se_sess->sess_cmd_lock)
a17f091d 2476{
7481deb4
NB		 2477 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2478 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2479
a17f091d 2480 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2481 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2482 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2483 return;
a17f091d 2484 }
a17f091d 2485 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2486 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2487 complete(&se_cmd->cmd_wait_comp);
7481deb4 2488 return;
a17f091d
NB		 2489 }
2490 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2491 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2492
7481deb4
NB		 2493 se_cmd->se_tfo->release_cmd(se_cmd);
2494}
2495
2496/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2497 * @se_cmd: command descriptor to drop
2498 */
afc16604 2499int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2500{
afc16604
BVA		 2501 struct se_session *se_sess = se_cmd->se_sess;
2502
0ed6e189
NB		 2503 if (!se_sess) {
2504 se_cmd->se_tfo->release_cmd(se_cmd);
2505 return 1;
2506 }
ccf5ae83
JE		 2507 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2508 &se_sess->sess_cmd_lock);
a17f091d
NB		 2509}
2510EXPORT_SYMBOL(target_put_sess_cmd);
2511
1c7b13fe
RD		 2512/* target_sess_cmd_list_set_waiting - Flag all commands in
2513 * sess_cmd_list to complete cmd_wait_comp. Set
2514 * sess_tearing_down so no more commands are queued.
2515 * @se_sess: session to flag
a17f091d 2516 */
1c7b13fe 2517void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2518{
2519 struct se_cmd *se_cmd;
2520 unsigned long flags;
2521
a17f091d 2522 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2523 if (se_sess->sess_tearing_down) {
2524 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2525 return;
2526 }
1c7b13fe 2527 se_sess->sess_tearing_down = 1;
9b31a328 2528 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2529
9b31a328 2530 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2531 se_cmd->cmd_wait_set = 1;
2532
2533 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2534}
1c7b13fe 2535EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2536
2537/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2538 * @se_sess: session to wait for active I/O
a17f091d 2539 */
be646c2d 2540void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2541{
2542 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2543 unsigned long flags;
a17f091d
NB		 2544
2545 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2546 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2547 list_del(&se_cmd->se_cmd_list);
2548
2549 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2550 " %d\n", se_cmd, se_cmd->t_state,
2551 se_cmd->se_tfo->get_cmd_state(se_cmd));
2552
be646c2d
JE		 2553 wait_for_completion(&se_cmd->cmd_wait_comp);
2554 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2555 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2556 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2557
2558 se_cmd->se_tfo->release_cmd(se_cmd);
2559 }
9b31a328
NB		 2560
2561 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2562 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2563 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2564
a17f091d
NB		 2565}
2566EXPORT_SYMBOL(target_wait_for_sess_cmds);
2567
b3eeea66 2568void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2569{
5277797d 2570 percpu_ref_kill(&lun->lun_ref);
5277797d 2571 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2572}
2573
d14921d6
NB		 2574/**
2575 * transport_wait_for_tasks - wait for completion to occur
2576 * @cmd: command to wait
c66ac9db 2577 *
d14921d6
NB		 2578 * Called from frontend fabric context to wait for storage engine
2579 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2580 */
a17f091d 2581bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2582{
2583 unsigned long flags;
2584
a1d8b49a 2585 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2586 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2587 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2588 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2589 return false;
d14921d6 2590 }
cb4f4d3c 2591
c8e31f26
AG		 2592 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2593 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2594 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2595 return false;
d14921d6 2596 }
7d680f3b 2597
3d28934a 2598 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2599 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2600 return false;
d14921d6 2601 }
c66ac9db 2602
7d680f3b 2603 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2604
649ee054
BVA		 2605 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d, t_state: %d, CMD_T_STOP\n",
2606 cmd, cmd->tag, cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2607
a1d8b49a 2608 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2609
a1d8b49a 2610 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2611
a1d8b49a 2612 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2613 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2614
649ee054
BVA		 2615 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->t_transport_stop_comp) for ITT: 0x%08llx\n",
2616 cmd->tag);
c66ac9db 2617
d14921d6 2618 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2619
2620 return true;
c66ac9db 2621}
d14921d6 2622EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2623
ab78fef4
BVA		 2624struct sense_info {
2625 u8 key;
2626 u8 asc;
2627 u8 ascq;
2628 bool add_sector_info;
2629};
2630
2631static const struct sense_info sense_info_table[] = {
2632 [TCM_NO_SENSE] = {
2633 .key = NOT_READY
2634 },
2635 [TCM_NON_EXISTENT_LUN] = {
2636 .key = ILLEGAL_REQUEST,
2637 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2638 },
2639 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2640 .key = ILLEGAL_REQUEST,
2641 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2642 },
2643 [TCM_SECTOR_COUNT_TOO_MANY] = {
2644 .key = ILLEGAL_REQUEST,
2645 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2646 },
2647 [TCM_UNKNOWN_MODE_PAGE] = {
2648 .key = ILLEGAL_REQUEST,
2649 .asc = 0x24, /* INVALID FIELD IN CDB */
2650 },
2651 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2652 .key = ABORTED_COMMAND,
2653 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2654 .ascq = 0x03,
2655 },
2656 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2657 .key = ABORTED_COMMAND,
2658 .asc = 0x0c, /* WRITE ERROR */
2659 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2660 },
2661 [TCM_INVALID_CDB_FIELD] = {
2662 .key = ILLEGAL_REQUEST,
2663 .asc = 0x24, /* INVALID FIELD IN CDB */
2664 },
2665 [TCM_INVALID_PARAMETER_LIST] = {
2666 .key = ILLEGAL_REQUEST,
2667 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2668 },
2669 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2670 .key = ILLEGAL_REQUEST,
2671 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2672 },
2673 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2674 .key = ILLEGAL_REQUEST,
2675 .asc = 0x0c, /* WRITE ERROR */
2676 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2677 },
2678 [TCM_SERVICE_CRC_ERROR] = {
2679 .key = ABORTED_COMMAND,
2680 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2681 .ascq = 0x05, /* N/A */
2682 },
2683 [TCM_SNACK_REJECTED] = {
2684 .key = ABORTED_COMMAND,
2685 .asc = 0x11, /* READ ERROR */
2686 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2687 },
2688 [TCM_WRITE_PROTECTED] = {
2689 .key = DATA_PROTECT,
2690 .asc = 0x27, /* WRITE PROTECTED */
2691 },
2692 [TCM_ADDRESS_OUT_OF_RANGE] = {
2693 .key = ILLEGAL_REQUEST,
2694 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2695 },
2696 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2697 .key = UNIT_ATTENTION,
2698 },
2699 [TCM_CHECK_CONDITION_NOT_READY] = {
2700 .key = NOT_READY,
2701 },
2702 [TCM_MISCOMPARE_VERIFY] = {
2703 .key = MISCOMPARE,
2704 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2705 .ascq = 0x00,
2706 },
2707 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2708 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2709 .asc = 0x10,
2710 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2711 .add_sector_info = true,
2712 },
2713 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2714 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2715 .asc = 0x10,
2716 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2717 .add_sector_info = true,
2718 },
2719 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2720 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2721 .asc = 0x10,
2722 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2723 .add_sector_info = true,
2724 },
2725 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2726 /*
2727 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2728 * Solaris initiators. Returning NOT READY instead means the
2729 * operations will be retried a finite number of times and we
2730 * can survive intermittent errors.
2731 */
2732 .key = NOT_READY,
2733 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2734 },
2735};
2736
f5a8b3a7 2737static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2738{
2739 const struct sense_info *si;
2740 u8 *buffer = cmd->sense_buffer;
2741 int r = (__force int)reason;
2742 u8 asc, ascq;
4e4937e8 2743 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 2744
2745 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2746 si = &sense_info_table[r];
2747 else
2748 si = &sense_info_table[(__force int)
2749 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2750
ab78fef4
BVA		 2751 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2752 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2753 WARN_ON_ONCE(asc == 0);
2754 } else if (si->asc == 0) {
2755 WARN_ON_ONCE(cmd->scsi_asc == 0);
2756 asc = cmd->scsi_asc;
2757 ascq = cmd->scsi_ascq;
2758 } else {
2759 asc = si->asc;
2760 ascq = si->ascq;
2761 }
9ec1e1ce 2762
4e4937e8 2763 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 2764 if (si->add_sector_info)
f5a8b3a7
SG		 2765 return scsi_set_sense_information(buffer,
2766 cmd->scsi_sense_length,
2767 cmd->bad_sector);
2768
2769 return 0;
ab78fef4
BVA		 2770}
2771
de103c93
CH		 2772int
2773transport_send_check_condition_and_sense(struct se_cmd *cmd,
2774 sense_reason_t reason, int from_transport)
c66ac9db 2775{
c66ac9db 2776 unsigned long flags;
c66ac9db 2777
a1d8b49a 2778 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2779 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2780 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2781 return 0;
2782 }
2783 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2784 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2785
ab78fef4 2786 if (!from_transport) {
f5a8b3a7
SG		 2787 int rc;
2788
c66ac9db 2789 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 2790 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2791 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 2792 rc = translate_sense_reason(cmd, reason);
2793 if (rc)
2794 return rc;
c66ac9db 2795 }
c66ac9db 2796
e5c0d6ad 2797 trace_target_cmd_complete(cmd);
07bde79a 2798 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2799}
2800EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2801
2802int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2803{
c18bc7d8
RD		 2804 if (!(cmd->transport_state & CMD_T_ABORTED))
2805 return 0;
c66ac9db 2806
68259b5a
AL		 2807 /*
2808 * If cmd has been aborted but either no status is to be sent or it has
2809 * already been sent, just return
2810 */
2811 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
c18bc7d8 2812 return 1;
8b1e1244 2813
649ee054
BVA		 2814 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08llx\n",
2815 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2816
68259b5a 2817 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2818 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2819 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2820 cmd->se_tfo->queue_status(cmd);
2821
2822 return 1;
c66ac9db
NB		 2823}
2824EXPORT_SYMBOL(transport_check_aborted_status);
2825
2826void transport_send_task_abort(struct se_cmd *cmd)
2827{
c252f003
NB		 2828 unsigned long flags;
2829
2830 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2831 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2832 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2833 return;
2834 }
2835 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2836
c66ac9db
NB		 2837 /*
2838 * If there are still expected incoming fabric WRITEs, we wait
2839 * until until they have completed before sending a TASK_ABORTED
2840 * response. This response with TASK_ABORTED status will be
2841 * queued back to fabric module by transport_check_aborted_status().
2842 */
2843 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2844 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2845 cmd->transport_state |= CMD_T_ABORTED;
68259b5a 2846 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
29f4c090 2847 return;
c66ac9db
NB		 2848 }
2849 }
2850 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2851
72b59d6e
RD		 2852 transport_lun_remove_cmd(cmd);
2853
649ee054
BVA		 2854 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
2855 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2856
e5c0d6ad 2857 trace_target_cmd_complete(cmd);
e3d6f909 2858 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2859}
2860
af877292 2861static void target_tmr_work(struct work_struct *work)
c66ac9db 2862{
af877292 2863 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2864 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2865 struct se_tmr_req *tmr = cmd->se_tmr_req;
2866 int ret;
2867
2868 switch (tmr->function) {
5c6cd613 2869 case TMR_ABORT_TASK:
3d28934a 2870 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2871 break;
5c6cd613
NB		 2872 case TMR_ABORT_TASK_SET:
2873 case TMR_CLEAR_ACA:
2874 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2875 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2876 break;
5c6cd613 2877 case TMR_LUN_RESET:
c66ac9db
NB		 2878 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2879 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2880 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 2881 if (tmr->response == TMR_FUNCTION_COMPLETE) {
2882 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
2883 cmd->orig_fe_lun, 0x29,
2884 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
2885 }
c66ac9db 2886 break;
5c6cd613 2887 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2888 tmr->response = TMR_FUNCTION_REJECTED;
2889 break;
5c6cd613 2890 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2891 tmr->response = TMR_FUNCTION_REJECTED;
2892 break;
c66ac9db 2893 default:
6708bb27 2894 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2895 tmr->function);
2896 tmr->response = TMR_FUNCTION_REJECTED;
2897 break;
2898 }
2899
2900 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2901 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2902
b7b8bef7 2903 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2904}
2905
af877292
CH		 2906int transport_generic_handle_tmr(
2907 struct se_cmd *cmd)
c66ac9db 2908{
f15e9cd9
NB		 2909 unsigned long flags;
2910
2911 spin_lock_irqsave(&cmd->t_state_lock, flags);
2912 cmd->transport_state |= CMD_T_ACTIVE;
2913 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2914
af877292
CH		 2915 INIT_WORK(&cmd->work, target_tmr_work);
2916 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2917 return 0;
2918}
af877292 2919EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 2920
2921bool
2922target_check_wce(struct se_device *dev)
2923{
2924 bool wce = false;
2925
2926 if (dev->transport->get_write_cache)
2927 wce = dev->transport->get_write_cache(dev);
2928 else if (dev->dev_attrib.emulate_write_cache > 0)
2929 wce = true;
2930
2931 return wce;
2932}
2933
2934bool
2935target_check_fua(struct se_device *dev)
2936{
2937 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
2938}
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