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[GitHub/exynos8895/android_kernel_samsung_universal8895.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
8f9b5654
NB		 1078static sense_reason_t
1079target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1080 unsigned int size)
1081{
1082 u32 mtl;
1083
1084 if (!cmd->se_tfo->max_data_sg_nents)
1085 return TCM_NO_SENSE;
1086 /*
1087 * Check if fabric enforced maximum SGL entries per I/O descriptor
1088 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1089 * residual_count and reduce original cmd->data_length to maximum
1090 * length based on single PAGE_SIZE entry scatter-lists.
1091 */
1092 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1093 if (cmd->data_length > mtl) {
1094 /*
1095 * If an existing CDB overflow is present, calculate new residual
1096 * based on CDB size minus fabric maximum transfer length.
1097 *
1098 * If an existing CDB underflow is present, calculate new residual
1099 * based on original cmd->data_length minus fabric maximum transfer
1100 * length.
1101 *
1102 * Otherwise, set the underflow residual based on cmd->data_length
1103 * minus fabric maximum transfer length.
1104 */
1105 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1106 cmd->residual_count = (size - mtl);
1107 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1108 u32 orig_dl = size + cmd->residual_count;
1109 cmd->residual_count = (orig_dl - mtl);
1110 } else {
1111 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1112 cmd->residual_count = (cmd->data_length - mtl);
1113 }
1114 cmd->data_length = mtl;
1115 /*
1116 * Reset sbc_check_prot() calculated protection payload
1117 * length based upon the new smaller MTL.
1118 */
1119 if (cmd->prot_length) {
1120 u32 sectors = (mtl / dev->dev_attrib.block_size);
1121 cmd->prot_length = dev->prot_length * sectors;
1122 }
1123 }
1124 return TCM_NO_SENSE;
1125}
1126
de103c93
CH		 1127sense_reason_t
1128target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1129{
1130 struct se_device *dev = cmd->se_dev;
1131
1132 if (cmd->unknown_data_length) {
1133 cmd->data_length = size;
1134 } else if (size != cmd->data_length) {
1135 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1136 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1137 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1138 cmd->data_length, size, cmd->t_task_cdb[0]);
1139
c72c5250
RD		 1140 if (cmd->data_direction == DMA_TO_DEVICE &&
1141 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1142 pr_err("Rejecting underflow/overflow WRITE data\n");
de103c93 1143 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1144 }
1145 /*
1146 * Reject READ_* or WRITE_* with overflow/underflow for
1147 * type SCF_SCSI_DATA_CDB.
1148 */
0fd97ccf 1149 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1150 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1151 " CDB on non 512-byte sector setup subsystem"
1152 " plugin: %s\n", dev->transport->name);
1153 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1154 return TCM_INVALID_CDB_FIELD;
9b3b8041 1155 }
4c054ba6
NB		 1156 /*
1157 * For the overflow case keep the existing fabric provided
1158 * ->data_length. Otherwise for the underflow case, reset
1159 * ->data_length to the smaller SCSI expected data transfer
1160 * length.
1161 */
9b3b8041
CH		 1162 if (size > cmd->data_length) {
1163 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1164 cmd->residual_count = (size - cmd->data_length);
1165 } else {
1166 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1167 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1168 cmd->data_length = size;
9b3b8041 1169 }
9b3b8041
CH		 1170 }
1171
8f9b5654 1172 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1173
9b3b8041
CH		 1174}
1175
c66ac9db
NB		 1176/*
1177 * Used by fabric modules containing a local struct se_cmd within their
1178 * fabric dependent per I/O descriptor.
649ee054
BVA		 1179 *
1180 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1181 */
1182void transport_init_se_cmd(
1183 struct se_cmd *cmd,
9ac8928e 1184 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1185 struct se_session *se_sess,
1186 u32 data_length,
1187 int data_direction,
1188 int task_attr,
1189 unsigned char *sense_buffer)
1190{
5951146d 1191 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1192 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1193 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1194 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1195 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1196 init_completion(&cmd->cmd_wait_comp);
cf572a96 1197 init_completion(&cmd->task_stop_comp);
a1d8b49a 1198 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1199 kref_init(&cmd->cmd_kref);
7d680f3b 1200 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1201
1202 cmd->se_tfo = tfo;
1203 cmd->se_sess = se_sess;
1204 cmd->data_length = data_length;
1205 cmd->data_direction = data_direction;
1206 cmd->sam_task_attr = task_attr;
1207 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1208
1209 cmd->state_active = false;
c66ac9db
NB		 1210}
1211EXPORT_SYMBOL(transport_init_se_cmd);
1212
de103c93
CH		 1213static sense_reason_t
1214transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1215{
019c4ca6
CH		 1216 struct se_device *dev = cmd->se_dev;
1217
c66ac9db
NB		 1218 /*
1219 * Check if SAM Task Attribute emulation is enabled for this
1220 * struct se_device storage object
1221 */
a3541703 1222 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1223 return 0;
1224
68d81f40 1225 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1226 pr_debug("SAM Task Attribute ACA"
c66ac9db 1227 " emulation is not supported\n");
de103c93 1228 return TCM_INVALID_CDB_FIELD;
c66ac9db 1229 }
9c31820b 1230
c66ac9db
NB		 1231 return 0;
1232}
1233
de103c93
CH		 1234sense_reason_t
1235target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1236{
0fd97ccf 1237 struct se_device *dev = cmd->se_dev;
de103c93 1238 sense_reason_t ret;
c66ac9db 1239
c66ac9db
NB		 1240 /*
1241 * Ensure that the received CDB is less than the max (252 + 8) bytes
1242 * for VARIABLE_LENGTH_CMD
1243 */
1244 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1245 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1246 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1247 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1248 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1249 }
1250 /*
1251 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1252 * allocate the additional extended CDB buffer now.. Otherwise
1253 * setup the pointer from __t_task_cdb to t_task_cdb.
1254 */
a1d8b49a
AG		 1255 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1256 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1257 GFP_KERNEL);
6708bb27
AG		 1258 if (!cmd->t_task_cdb) {
1259 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1260 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1261 scsi_command_size(cdb),
a1d8b49a 1262 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1263 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1264 }
1265 } else
a1d8b49a 1266 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1267 /*
a1d8b49a 1268 * Copy the original CDB into cmd->
c66ac9db 1269 */
a1d8b49a 1270 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1271
e5c0d6ad
RD		 1272 trace_target_sequencer_start(cmd);
1273
cb4f4d3c
CH		 1274 /*
1275 * Check for an existing UNIT ATTENTION condition
1276 */
de103c93
CH		 1277 ret = target_scsi3_ua_check(cmd);
1278 if (ret)
1279 return ret;
cb4f4d3c 1280
c87fbd56 1281 ret = target_alua_state_check(cmd);
de103c93
CH		 1282 if (ret)
1283 return ret;
cb4f4d3c 1284
d977f437 1285 ret = target_check_reservation(cmd);
f85eda8d
NB		 1286 if (ret) {
1287 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1288 return ret;
f85eda8d 1289 }
cb4f4d3c 1290
0fd97ccf 1291 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1292 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1293 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1294 cmd->se_tfo->get_fabric_name(),
1295 cmd->se_sess->se_node_acl->initiatorname,
1296 cmd->t_task_cdb[0]);
de103c93
CH		 1297 if (ret)
1298 return ret;
1299
1300 ret = transport_check_alloc_task_attr(cmd);
1301 if (ret)
c66ac9db 1302 return ret;
cb4f4d3c 1303
cb4f4d3c 1304 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1305 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1306 return 0;
1307}
a12f41f8 1308EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1309
695434e1
NB		 1310/*
1311 * Used by fabric module frontends to queue tasks directly.
1312 * Many only be used from process context only
1313 */
1314int transport_handle_cdb_direct(
1315 struct se_cmd *cmd)
1316{
de103c93 1317 sense_reason_t ret;
dd8ae59d 1318
695434e1
NB		 1319 if (!cmd->se_lun) {
1320 dump_stack();
6708bb27 1321 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1322 return -EINVAL;
1323 }
1324 if (in_interrupt()) {
1325 dump_stack();
6708bb27 1326 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1327 " from interrupt context\n");
1328 return -EINVAL;
1329 }
dd8ae59d 1330 /*
af877292
CH		 1331 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1332 * outstanding descriptors are handled correctly during shutdown via
1333 * transport_wait_for_tasks()
dd8ae59d
NB		 1334 *
1335 * Also, we don't take cmd->t_state_lock here as we only expect
1336 * this to be called for initial descriptor submission.
1337 */
1338 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1339 cmd->transport_state |= CMD_T_ACTIVE;
1340
dd8ae59d
NB		 1341 /*
1342 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1343 * so follow TRANSPORT_NEW_CMD processing thread context usage
1344 * and call transport_generic_request_failure() if necessary..
1345 */
1346 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1347 if (ret)
1348 transport_generic_request_failure(cmd, ret);
dd8ae59d 1349 return 0;
695434e1
NB		 1350}
1351EXPORT_SYMBOL(transport_handle_cdb_direct);
1352
c5ff8d6b 1353sense_reason_t
de103c93
CH		 1354transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1355 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1356{
1357 if (!sgl || !sgl_count)
1358 return 0;
1359
1360 /*
1361 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1362 * scatterlists already have been set to follow what the fabric
1363 * passes for the original expected data transfer length.
1364 */
1365 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1366 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1367 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1368 return TCM_INVALID_CDB_FIELD;
1369 }
1370
1371 cmd->t_data_sg = sgl;
1372 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1373 cmd->t_bidi_data_sg = sgl_bidi;
1374 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1375
de103c93
CH		 1376 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1377 return 0;
1378}
1379
a026757f
NB		 1380/*
1381 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1382 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1383 *
1384 * @se_cmd: command descriptor to submit
1385 * @se_sess: associated se_sess for endpoint
1386 * @cdb: pointer to SCSI CDB
1387 * @sense: pointer to SCSI sense buffer
1388 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1389 * @data_length: fabric expected data transfer length
1390 * @task_addr: SAM task attribute
1391 * @data_dir: DMA data direction
1392 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1393 * @sgl: struct scatterlist memory for unidirectional mapping
1394 * @sgl_count: scatterlist count for unidirectional mapping
1395 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1396 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1397 * @sgl_prot: struct scatterlist memory protection information
1398 * @sgl_prot_count: scatterlist count for protection information
a6360785 1399 *
649ee054
BVA		 1400 * Task tags are supported if the caller has set @se_cmd->tag.
1401 *
d6dfc868
RD		 1402 * Returns non zero to signal active I/O shutdown failure. All other
1403 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1404 * but still return zero here.
1405 *
a6360785
NB		 1406 * This may only be called from process context, and also currently
1407 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1408 */
1409int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1410 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1411 u32 data_length, int task_attr, int data_dir, int flags,
1412 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1413 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1414 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1415{
1416 struct se_portal_group *se_tpg;
de103c93
CH		 1417 sense_reason_t rc;
1418 int ret;
a6360785
NB		 1419
1420 se_tpg = se_sess->se_tpg;
1421 BUG_ON(!se_tpg);
1422 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1423 BUG_ON(in_interrupt());
1424 /*
1425 * Initialize se_cmd for target operation. From this point
1426 * exceptions are handled by sending exception status via
1427 * target_core_fabric_ops->queue_status() callback
1428 */
1429 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1430 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1431 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1432 se_cmd->unknown_data_length = 1;
a6360785
NB		 1433 /*
1434 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1435 * se_sess->sess_cmd_list. A second kref_get here is necessary
1436 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1437 * kref_put() to happen during fabric packet acknowledgement.
1438 */
afc16604 1439 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1440 if (ret)
1441 return ret;
a6360785
NB		 1442 /*
1443 * Signal bidirectional data payloads to target-core
1444 */
1445 if (flags & TARGET_SCF_BIDI_OP)
1446 se_cmd->se_cmd_flags |= SCF_BIDI;
1447 /*
1448 * Locate se_lun pointer and attach it to struct se_cmd
1449 */
de103c93
CH		 1450 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1451 if (rc) {
1452 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1453 target_put_sess_cmd(se_cmd);
d6dfc868 1454 return 0;
735703ca 1455 }
b5b8e298
SG		 1456
1457 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1458 if (rc != 0) {
1459 transport_generic_request_failure(se_cmd, rc);
1460 return 0;
1461 }
1462
def2b339
NB		 1463 /*
1464 * Save pointers for SGLs containing protection information,
1465 * if present.
1466 */
1467 if (sgl_prot_count) {
1468 se_cmd->t_prot_sg = sgl_prot;
1469 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1470 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1471 }
d6e0175c 1472
a026757f
NB		 1473 /*
1474 * When a non zero sgl_count has been passed perform SGL passthrough
1475 * mapping for pre-allocated fabric memory instead of having target
1476 * core perform an internal SGL allocation..
1477 */
1478 if (sgl_count != 0) {
1479 BUG_ON(!sgl);
1480
944981c7
NB		 1481 /*
1482 * A work-around for tcm_loop as some userspace code via
1483 * scsi-generic do not memset their associated read buffers,
1484 * so go ahead and do that here for type non-data CDBs. Also
1485 * note that this is currently guaranteed to be a single SGL
1486 * for this case by target core in target_setup_cmd_from_cdb()
1487 * -> transport_generic_cmd_sequencer().
1488 */
1489 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1490 se_cmd->data_direction == DMA_FROM_DEVICE) {
1491 unsigned char *buf = NULL;
1492
1493 if (sgl)
1494 buf = kmap(sg_page(sgl)) + sgl->offset;
1495
1496 if (buf) {
1497 memset(buf, 0, sgl->length);
1498 kunmap(sg_page(sgl));
1499 }
1500 }
1501
a026757f
NB		 1502 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1503 sgl_bidi, sgl_bidi_count);
1504 if (rc != 0) {
de103c93 1505 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1506 return 0;
1507 }
1508 }
def2b339 1509
11e319ed
AG		 1510 /*
1511 * Check if we need to delay processing because of ALUA
1512 * Active/NonOptimized primary access state..
1513 */
1514 core_alua_check_nonop_delay(se_cmd);
1515
a6360785 1516 transport_handle_cdb_direct(se_cmd);
d6dfc868 1517 return 0;
a6360785 1518}
a026757f
NB		 1519EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1520
1521/*
1522 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1523 *
1524 * @se_cmd: command descriptor to submit
1525 * @se_sess: associated se_sess for endpoint
1526 * @cdb: pointer to SCSI CDB
1527 * @sense: pointer to SCSI sense buffer
1528 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1529 * @data_length: fabric expected data transfer length
1530 * @task_addr: SAM task attribute
1531 * @data_dir: DMA data direction
1532 * @flags: flags for command submission from target_sc_flags_tables
1533 *
649ee054
BVA		 1534 * Task tags are supported if the caller has set @se_cmd->tag.
1535 *
a026757f
NB		 1536 * Returns non zero to signal active I/O shutdown failure. All other
1537 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1538 * but still return zero here.
1539 *
1540 * This may only be called from process context, and also currently
1541 * assumes internal allocation of fabric payload buffer by target-core.
1542 *
1543 * It also assumes interal target core SGL memory allocation.
1544 */
1545int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1546 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1547 u32 data_length, int task_attr, int data_dir, int flags)
1548{
1549 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1550 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1551 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1552}
a6360785
NB		 1553EXPORT_SYMBOL(target_submit_cmd);
1554
9f0d05c2
NB		 1555static void target_complete_tmr_failure(struct work_struct *work)
1556{
1557 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1558
1559 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1560 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1561
1562 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1563}
1564
ea98d7f9
AG		 1565/**
1566 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1567 * for TMR CDBs
1568 *
1569 * @se_cmd: command descriptor to submit
1570 * @se_sess: associated se_sess for endpoint
1571 * @sense: pointer to SCSI sense buffer
1572 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1573 * @fabric_context: fabric context for TMR req
1574 * @tm_type: Type of TM request
c0974f89
NB		 1575 * @gfp: gfp type for caller
1576 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1577 * @flags: submit cmd flags
ea98d7f9
AG		 1578 *
1579 * Callable from all contexts.
1580 **/
1581
c7042cae 1582int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1583 unsigned char *sense, u64 unpacked_lun,
c0974f89
NB		 1584 void *fabric_tmr_ptr, unsigned char tm_type,
1585 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1586{
1587 struct se_portal_group *se_tpg;
1588 int ret;
1589
1590 se_tpg = se_sess->se_tpg;
1591 BUG_ON(!se_tpg);
1592
1593 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1594 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1595 /*
1596 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1597 * allocation failure.
1598 */
c0974f89 1599 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1600 if (ret < 0)
1601 return -ENOMEM;
ea98d7f9 1602
c0974f89
NB		 1603 if (tm_type == TMR_ABORT_TASK)
1604 se_cmd->se_tmr_req->ref_task_tag = tag;
1605
ea98d7f9 1606 /* See target_submit_cmd for commentary */
afc16604 1607 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1608 if (ret) {
1609 core_tmr_release_req(se_cmd->se_tmr_req);
1610 return ret;
1611 }
ea98d7f9 1612
ea98d7f9
AG		 1613 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1614 if (ret) {
9f0d05c2
NB		 1615 /*
1616 * For callback during failure handling, push this work off
1617 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1618 */
1619 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1620 schedule_work(&se_cmd->work);
c7042cae 1621 return 0;
ea98d7f9
AG		 1622 }
1623 transport_generic_handle_tmr(se_cmd);
c7042cae 1624 return 0;
ea98d7f9
AG		 1625}
1626EXPORT_SYMBOL(target_submit_tmr);
1627
cdbb70bb 1628/*
cf572a96 1629 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1630 * has completed.
1631 */
cf572a96 1632bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cb0df4d3
BVA		 1633 __releases(&cmd->t_state_lock)
1634 __acquires(&cmd->t_state_lock)
cdbb70bb 1635{
cdbb70bb
CH		 1636 bool was_active = false;
1637
cf572a96
CH		 1638 if (cmd->transport_state & CMD_T_BUSY) {
1639 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1640 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1641
cf572a96
CH		 1642 pr_debug("cmd %p waiting to complete\n", cmd);
1643 wait_for_completion(&cmd->task_stop_comp);
1644 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1645
1646 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1647 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1648 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1649 was_active = true;
1650 }
1651
cdbb70bb
CH		 1652 return was_active;
1653}
1654
c66ac9db
NB		 1655/*
1656 * Handle SAM-esque emulation for generic transport request failures.
1657 */
de103c93
CH		 1658void transport_generic_request_failure(struct se_cmd *cmd,
1659 sense_reason_t sense_reason)
c66ac9db 1660{
057085e5 1661 int ret = 0, post_ret = 0;
07bde79a 1662
649ee054
BVA		 1663 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1664 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1665 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1666 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1667 cmd->t_state, sense_reason);
d43d6aea 1668 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1669 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1670 (cmd->transport_state & CMD_T_STOP) != 0,
1671 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1672
c66ac9db
NB		 1673 /*
1674 * For SAM Task Attribute emulation for failed struct se_cmd
1675 */
019c4ca6 1676 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1677 /*
1678 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1679 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1680 */
1681 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1682 cmd->transport_complete_callback)
057085e5 1683 cmd->transport_complete_callback(cmd, false, &post_ret);
c66ac9db 1684
de103c93 1685 switch (sense_reason) {
03e98c9e
NB		 1686 case TCM_NON_EXISTENT_LUN:
1687 case TCM_UNSUPPORTED_SCSI_OPCODE:
1688 case TCM_INVALID_CDB_FIELD:
1689 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1690 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1691 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1692 case TCM_UNKNOWN_MODE_PAGE:
1693 case TCM_WRITE_PROTECTED:
e2397c70 1694 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1695 case TCM_CHECK_CONDITION_ABORT_CMD:
1696 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1697 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1698 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1699 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1700 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1701 break;
de103c93
CH		 1702 case TCM_OUT_OF_RESOURCES:
1703 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1704 break;
03e98c9e 1705 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1706 /*
1707 * No SENSE Data payload for this case, set SCSI Status
1708 * and queue the response to $FABRIC_MOD.
1709 *
1710 * Uses linux/include/scsi/scsi.h SAM status codes defs
1711 */
1712 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1713 /*
1714 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1715 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1716 * CONFLICT STATUS.
1717 *
1718 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1719 */
e3d6f909 1720 if (cmd->se_sess &&
c51c8e7b
HR		 1721 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1722 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1723 cmd->orig_fe_lun, 0x2C,
1724 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1725 }
e5c0d6ad 1726 trace_target_cmd_complete(cmd);
c51c8e7b 1727 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1728 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1729 goto queue_full;
c66ac9db 1730 goto check_stop;
c66ac9db 1731 default:
6708bb27 1732 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1733 cmd->t_task_cdb[0], sense_reason);
1734 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1735 break;
1736 }
f3146437 1737
de103c93 1738 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1739 if (ret == -EAGAIN || ret == -ENOMEM)
1740 goto queue_full;
07bde79a 1741
c66ac9db
NB		 1742check_stop:
1743 transport_lun_remove_cmd(cmd);
06b967e4 1744 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1745 return;
1746
1747queue_full:
e057f533
CH		 1748 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1749 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1750}
2fbff127 1751EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1752
76dde50e 1753void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1754{
de103c93 1755 sense_reason_t ret;
5f41a31d 1756
de103c93
CH		 1757 if (cmd->execute_cmd) {
1758 ret = cmd->execute_cmd(cmd);
1759 if (ret) {
1760 spin_lock_irq(&cmd->t_state_lock);
1761 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1762 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1763
de103c93
CH		 1764 transport_generic_request_failure(cmd, ret);
1765 }
5f41a31d
CH		 1766 }
1767}
1768
aa58b531
NB		 1769static int target_write_prot_action(struct se_cmd *cmd)
1770{
5132d1e6 1771 u32 sectors;
aa58b531
NB		 1772 /*
1773 * Perform WRITE_INSERT of PI using software emulation when backend
1774 * device has PI enabled, if the transport has not already generated
1775 * PI using hardware WRITE_INSERT offload.
1776 */
1777 switch (cmd->prot_op) {
1778 case TARGET_PROT_DOUT_INSERT:
1779 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1780 sbc_dif_generate(cmd);
1781 break;
5132d1e6
NB		 1782 case TARGET_PROT_DOUT_STRIP:
1783 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1784 break;
1785
1786 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1787 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1788 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1789 if (unlikely(cmd->pi_err)) {
1790 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1791 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1792 spin_unlock_irq(&cmd->t_state_lock);
1793 transport_generic_request_failure(cmd, cmd->pi_err);
1794 return -1;
1795 }
1796 break;
aa58b531
NB		 1797 default:
1798 break;
1799 }
1800
1801 return 0;
1802}
1803
019c4ca6 1804static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1805{
1806 struct se_device *dev = cmd->se_dev;
1807
a3541703 1808 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1809 return false;
5f41a31d 1810
c66ac9db 1811 /*
25985edc 1812 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1813 * to allow the passed struct se_cmd list of tasks to the front of the list.
1814 */
5f41a31d 1815 switch (cmd->sam_task_attr) {
68d81f40 1816 case TCM_HEAD_TAG:
9c31820b
RD		 1817 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1818 cmd->t_task_cdb[0]);
019c4ca6 1819 return false;
68d81f40 1820 case TCM_ORDERED_TAG:
33940d09 1821 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1822
9c31820b
RD		 1823 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1824 cmd->t_task_cdb[0]);
5f41a31d 1825
c66ac9db 1826 /*
5f41a31d
CH		 1827 * Execute an ORDERED command if no other older commands
1828 * exist that need to be completed first.
c66ac9db 1829 */
5f41a31d 1830 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1831 return false;
5f41a31d
CH		 1832 break;
1833 default:
c66ac9db
NB		 1834 /*
1835 * For SIMPLE and UNTAGGED Task Attribute commands
1836 */
33940d09 1837 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1838 break;
c66ac9db 1839 }
5f41a31d 1840
019c4ca6
CH		 1841 if (atomic_read(&dev->dev_ordered_sync) == 0)
1842 return false;
c66ac9db 1843
019c4ca6
CH		 1844 spin_lock(&dev->delayed_cmd_lock);
1845 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1846 spin_unlock(&dev->delayed_cmd_lock);
1847
9c31820b
RD		 1848 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1849 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1850 return true;
1851}
1852
1853void target_execute_cmd(struct se_cmd *cmd)
1854{
1855 /*
1856 * If the received CDB has aleady been aborted stop processing it here.
1857 */
4a9a6c8d 1858 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1859 return;
c66ac9db 1860
019c4ca6
CH		 1861 /*
1862 * Determine if frontend context caller is requesting the stopping of
1863 * this command for frontend exceptions.
1864 */
4a9a6c8d 1865 spin_lock_irq(&cmd->t_state_lock);
019c4ca6 1866 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1867 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1868 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1869
1870 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1871 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1872 return;
1873 }
1874
1875 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1876 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1877 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1878
1879 if (target_write_prot_action(cmd))
1880 return;
019c4ca6 1881
1a398b97
NB		 1882 if (target_handle_task_attr(cmd)) {
1883 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1884 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1885 spin_unlock_irq(&cmd->t_state_lock);
1886 return;
1887 }
1888
1889 __target_execute_cmd(cmd);
c66ac9db 1890}
70baf0ab 1891EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1892
5f41a31d
CH		 1893/*
1894 * Process all commands up to the last received ORDERED task attribute which
1895 * requires another blocking boundary
1896 */
1897static void target_restart_delayed_cmds(struct se_device *dev)
1898{
1899 for (;;) {
1900 struct se_cmd *cmd;
1901
1902 spin_lock(&dev->delayed_cmd_lock);
1903 if (list_empty(&dev->delayed_cmd_list)) {
1904 spin_unlock(&dev->delayed_cmd_lock);
1905 break;
1906 }
1907
1908 cmd = list_entry(dev->delayed_cmd_list.next,
1909 struct se_cmd, se_delayed_node);
1910 list_del(&cmd->se_delayed_node);
1911 spin_unlock(&dev->delayed_cmd_lock);
1912
1913 __target_execute_cmd(cmd);
1914
68d81f40 1915 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1916 break;
1917 }
1918}
1919
c66ac9db 1920/*
35e0e757 1921 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1922 * and ordered cmds need to have their tasks added to the execution queue.
1923 */
1924static void transport_complete_task_attr(struct se_cmd *cmd)
1925{
5951146d 1926 struct se_device *dev = cmd->se_dev;
c66ac9db 1927
a3541703 1928 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1929 return;
1930
68d81f40 1931 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1932 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1933 dev->dev_cur_ordered_id++;
9c31820b
RD		 1934 pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
1935 dev->dev_cur_ordered_id);
68d81f40 1936 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1937 dev->dev_cur_ordered_id++;
9c31820b
RD		 1938 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1939 dev->dev_cur_ordered_id);
68d81f40 1940 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1941 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1942
1943 dev->dev_cur_ordered_id++;
9c31820b
RD		 1944 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1945 dev->dev_cur_ordered_id);
c66ac9db 1946 }
c66ac9db 1947
5f41a31d 1948 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1949}
1950
e057f533 1951static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1952{
1953 int ret = 0;
1954
019c4ca6 1955 transport_complete_task_attr(cmd);
e057f533
CH		 1956
1957 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1958 trace_target_cmd_complete(cmd);
e057f533 1959 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1960 goto out;
e057f533 1961 }
07bde79a
NB		 1962
1963 switch (cmd->data_direction) {
1964 case DMA_FROM_DEVICE:
e5c0d6ad 1965 trace_target_cmd_complete(cmd);
07bde79a
NB		 1966 ret = cmd->se_tfo->queue_data_in(cmd);
1967 break;
1968 case DMA_TO_DEVICE:
64577407 1969 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1970 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 1971 break;
07bde79a
NB		 1972 }
1973 /* Fall through for DMA_TO_DEVICE */
1974 case DMA_NONE:
e5c0d6ad 1975 trace_target_cmd_complete(cmd);
07bde79a
NB		 1976 ret = cmd->se_tfo->queue_status(cmd);
1977 break;
1978 default:
1979 break;
1980 }
1981
e057f533
CH		 1982out:
1983 if (ret < 0) {
1984 transport_handle_queue_full(cmd, cmd->se_dev);
1985 return;
1986 }
1987 transport_lun_remove_cmd(cmd);
1988 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1989}
1990
1991static void transport_handle_queue_full(
1992 struct se_cmd *cmd,
e057f533 1993 struct se_device *dev)
07bde79a
NB		 1994{
1995 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 1996 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 1997 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 1998 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1999
2000 schedule_work(&cmd->se_dev->qf_work_queue);
2001}
2002
fdeab852 2003static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2004{
fdeab852
NB		 2005 switch (cmd->prot_op) {
2006 case TARGET_PROT_DIN_STRIP:
2007 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2008 u32 sectors = cmd->data_length >>
2009 ilog2(cmd->se_dev->dev_attrib.block_size);
2010
2011 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2012 sectors, 0, cmd->t_prot_sg,
2013 0);
2014 if (cmd->pi_err)
fdeab852 2015 return true;
bc005869 2016 }
fdeab852 2017 break;
72c03850
NB		 2018 case TARGET_PROT_DIN_INSERT:
2019 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2020 break;
2021
2022 sbc_dif_generate(cmd);
2023 break;
fdeab852
NB		 2024 default:
2025 break;
bc005869
NB		 2026 }
2027
2028 return false;
2029}
2030
35e0e757 2031static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2032{
35e0e757 2033 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2034 int ret;
35e0e757 2035
c66ac9db
NB		 2036 /*
2037 * Check if we need to move delayed/dormant tasks from cmds on the
2038 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2039 * Attribute.
2040 */
019c4ca6
CH		 2041 transport_complete_task_attr(cmd);
2042
07bde79a
NB		 2043 /*
2044 * Check to schedule QUEUE_FULL work, or execute an existing
2045 * cmd->transport_qf_callback()
2046 */
2047 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2048 schedule_work(&cmd->se_dev->qf_work_queue);
2049
c66ac9db 2050 /*
d5829eac 2051 * Check if we need to send a sense buffer from
c66ac9db
NB		 2052 * the struct se_cmd in question.
2053 */
2054 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2055 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2056 ret = transport_send_check_condition_and_sense(
2057 cmd, 0, 1);
2058 if (ret == -EAGAIN || ret == -ENOMEM)
2059 goto queue_full;
2060
2061 transport_lun_remove_cmd(cmd);
2062 transport_cmd_check_stop_to_fabric(cmd);
2063 return;
c66ac9db
NB		 2064 }
2065 /*
25985edc 2066 * Check for a callback, used by amongst other things
a6b0133c 2067 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2068 */
a6b0133c
NB		 2069 if (cmd->transport_complete_callback) {
2070 sense_reason_t rc;
057085e5
NB		 2071 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2072 bool zero_dl = !(cmd->data_length);
2073 int post_ret = 0;
a6b0133c 2074
057085e5
NB		 2075 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2076 if (!rc && !post_ret) {
2077 if (caw && zero_dl)
c8e63985
NB		 2078 goto queue_rsp;
2079
a6b0133c 2080 return;
a2890087
NB		 2081 } else if (rc) {
2082 ret = transport_send_check_condition_and_sense(cmd,
2083 rc, 0);
2084 if (ret == -EAGAIN || ret == -ENOMEM)
2085 goto queue_full;
a6b0133c 2086
a2890087
NB		 2087 transport_lun_remove_cmd(cmd);
2088 transport_cmd_check_stop_to_fabric(cmd);
2089 return;
2090 }
a6b0133c 2091 }
c66ac9db 2092
c8e63985 2093queue_rsp:
c66ac9db
NB		 2094 switch (cmd->data_direction) {
2095 case DMA_FROM_DEVICE:
4cc987ea
NB		 2096 atomic_long_add(cmd->data_length,
2097 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2098 /*
2099 * Perform READ_STRIP of PI using software emulation when
2100 * backend had PI enabled, if the transport will not be
2101 * performing hardware READ_STRIP offload.
2102 */
fdeab852 2103 if (target_read_prot_action(cmd)) {
bc005869
NB		 2104 ret = transport_send_check_condition_and_sense(cmd,
2105 cmd->pi_err, 0);
2106 if (ret == -EAGAIN || ret == -ENOMEM)
2107 goto queue_full;
2108
2109 transport_lun_remove_cmd(cmd);
2110 transport_cmd_check_stop_to_fabric(cmd);
2111 return;
2112 }
c66ac9db 2113
e5c0d6ad 2114 trace_target_cmd_complete(cmd);
07bde79a 2115 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2116 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2117 goto queue_full;
c66ac9db
NB		 2118 break;
2119 case DMA_TO_DEVICE:
4cc987ea
NB		 2120 atomic_long_add(cmd->data_length,
2121 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2122 /*
2123 * Check if we need to send READ payload for BIDI-COMMAND
2124 */
64577407 2125 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2126 atomic_long_add(cmd->data_length,
2127 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2128 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2129 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2130 goto queue_full;
c66ac9db
NB		 2131 break;
2132 }
2133 /* Fall through for DMA_TO_DEVICE */
2134 case DMA_NONE:
e5c0d6ad 2135 trace_target_cmd_complete(cmd);
07bde79a 2136 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2137 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2138 goto queue_full;
c66ac9db
NB		 2139 break;
2140 default:
2141 break;
2142 }
2143
2144 transport_lun_remove_cmd(cmd);
2145 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2146 return;
2147
2148queue_full:
6708bb27 2149 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2150 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2151 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2152 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2153}
2154
6708bb27 2155static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2156{
ec98f782 2157 struct scatterlist *sg;
ec98f782 2158 int count;
c66ac9db 2159
6708bb27
AG		 2160 for_each_sg(sgl, sg, nents, count)
2161 __free_page(sg_page(sg));
c66ac9db 2162
6708bb27
AG		 2163 kfree(sgl);
2164}
c66ac9db 2165
47e459e6
NB		 2166static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2167{
2168 /*
2169 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2170 * emulation, and free + reset pointers if necessary..
2171 */
2172 if (!cmd->t_data_sg_orig)
2173 return;
2174
2175 kfree(cmd->t_data_sg);
2176 cmd->t_data_sg = cmd->t_data_sg_orig;
2177 cmd->t_data_sg_orig = NULL;
2178 cmd->t_data_nents = cmd->t_data_nents_orig;
2179 cmd->t_data_nents_orig = 0;
2180}
2181
6708bb27
AG		 2182static inline void transport_free_pages(struct se_cmd *cmd)
2183{
5835812f
AM		 2184 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2185 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2186 cmd->t_prot_sg = NULL;
2187 cmd->t_prot_nents = 0;
2188 }
2189
47e459e6 2190 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2191 /*
2192 * Release special case READ buffer payload required for
2193 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2194 */
2195 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2196 transport_free_sgl(cmd->t_bidi_data_sg,
2197 cmd->t_bidi_data_nents);
2198 cmd->t_bidi_data_sg = NULL;
2199 cmd->t_bidi_data_nents = 0;
2200 }
47e459e6 2201 transport_reset_sgl_orig(cmd);
6708bb27 2202 return;
47e459e6
NB		 2203 }
2204 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2205
2206 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2207 cmd->t_data_sg = NULL;
2208 cmd->t_data_nents = 0;
c66ac9db 2209
6708bb27 2210 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2211 cmd->t_bidi_data_sg = NULL;
2212 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2213}
2214
e26d99ae
CH		 2215/**
2216 * transport_release_cmd - free a command
2217 * @cmd: command to free
2218 *
2219 * This routine unconditionally frees a command, and reference counting
2220 * or list removal must be done in the caller.
2221 */
d5ddad41 2222static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2223{
2224 BUG_ON(!cmd->se_tfo);
2225
c8e31f26 2226 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2227 core_tmr_release_req(cmd->se_tmr_req);
2228 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2229 kfree(cmd->t_task_cdb);
2230 /*
7481deb4
NB		 2231 * If this cmd has been setup with target_get_sess_cmd(), drop
2232 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2233 */
afc16604 2234 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2235}
2236
d3df7825
CH		 2237/**
2238 * transport_put_cmd - release a reference to a command
2239 * @cmd: command to release
2240 *
2241 * This routine releases our reference to the command and frees it if possible.
2242 */
d5ddad41 2243static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2244{
c66ac9db 2245 transport_free_pages(cmd);
d5ddad41 2246 return transport_release_cmd(cmd);
c66ac9db 2247}
c66ac9db 2248
4949314c 2249void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2250{
ec98f782 2251 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2252 struct page **pages;
2253 int i;
05d1c7c0
AG		 2254
2255 /*
ec98f782
AG		 2256 * We need to take into account a possible offset here for fabrics like
2257 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2258 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2259 */
4949314c
AG		 2260 if (!cmd->t_data_nents)
2261 return NULL;
3717ef0c
PB		 2262
2263 BUG_ON(!sg);
2264 if (cmd->t_data_nents == 1)
4949314c
AG		 2265 return kmap(sg_page(sg)) + sg->offset;
2266
2267 /* >1 page. use vmap */
2268 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2269 if (!pages)
4949314c
AG		 2270 return NULL;
2271
2272 /* convert sg[] to pages[] */
2273 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2274 pages[i] = sg_page(sg);
2275 }
2276
2277 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2278 kfree(pages);
de103c93 2279 if (!cmd->t_data_vmap)
4949314c
AG		 2280 return NULL;
2281
2282 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2283}
4949314c 2284EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2285
4949314c 2286void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2287{
a1edf9cf 2288 if (!cmd->t_data_nents) {
4949314c 2289 return;
a1edf9cf 2290 } else if (cmd->t_data_nents == 1) {
4949314c 2291 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2292 return;
2293 }
4949314c
AG		 2294
2295 vunmap(cmd->t_data_vmap);
2296 cmd->t_data_vmap = NULL;
05d1c7c0 2297}
4949314c 2298EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2299
c5ff8d6b 2300int
20093994
NB		 2301target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2302 bool zero_page)
c66ac9db 2303{
20093994 2304 struct scatterlist *sg;
ec98f782 2305 struct page *page;
20093994
NB		 2306 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2307 unsigned int nent;
ec98f782 2308 int i = 0;
c66ac9db 2309
20093994
NB		 2310 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2311 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2312 if (!sg)
ec98f782 2313 return -ENOMEM;
c66ac9db 2314
20093994 2315 sg_init_table(sg, nent);
9db9da33 2316
ec98f782
AG		 2317 while (length) {
2318 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2319 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2320 if (!page)
2321 goto out;
c66ac9db 2322
20093994 2323 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2324 length -= page_len;
2325 i++;
c66ac9db 2326 }
20093994
NB		 2327 *sgl = sg;
2328 *nents = nent;
c66ac9db 2329 return 0;
c66ac9db 2330
ec98f782 2331out:
d0e27c88 2332 while (i > 0) {
ec98f782 2333 i--;
20093994 2334 __free_page(sg_page(&sg[i]));
c66ac9db 2335 }
20093994 2336 kfree(sg);
ec98f782 2337 return -ENOMEM;
c66ac9db
NB		 2338}
2339
da0f7619 2340/*
b16a35b0
AG		 2341 * Allocate any required resources to execute the command. For writes we
2342 * might not have the payload yet, so notify the fabric via a call to
2343 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2344 */
de103c93
CH		 2345sense_reason_t
2346transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2347{
c66ac9db 2348 int ret = 0;
c8e63985 2349 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2350
5835812f
AM		 2351 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2352 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2353 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2354 cmd->prot_length, true);
2355 if (ret < 0)
2356 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2357 }
2358
c66ac9db
NB		 2359 /*
2360 * Determine is the TCM fabric module has already allocated physical
2361 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2362 * beforehand.
c66ac9db 2363 */
ec98f782
AG		 2364 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2365 cmd->data_length) {
20093994 2366
8cefe07b
NB		 2367 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2368 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2369 u32 bidi_length;
2370
2371 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2372 bidi_length = cmd->t_task_nolb *
2373 cmd->se_dev->dev_attrib.block_size;
2374 else
2375 bidi_length = cmd->data_length;
2376
2377 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2378 &cmd->t_bidi_data_nents,
2379 bidi_length, zero_flag);
2380 if (ret < 0)
2381 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2382 }
2383
20093994
NB		 2384 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2385 cmd->data_length, zero_flag);
c66ac9db 2386 if (ret < 0)
de103c93 2387 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2388 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2389 cmd->data_length) {
2390 /*
2391 * Special case for COMPARE_AND_WRITE with fabrics
2392 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2393 */
2394 u32 caw_length = cmd->t_task_nolb *
2395 cmd->se_dev->dev_attrib.block_size;
2396
2397 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2398 &cmd->t_bidi_data_nents,
2399 caw_length, zero_flag);
2400 if (ret < 0)
2401 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2402 }
c66ac9db 2403 /*
c3196f0c
CH		 2404 * If this command is not a write we can execute it right here,
2405 * for write buffers we need to notify the fabric driver first
2406 * and let it call back once the write buffers are ready.
c66ac9db 2407 */
5f41a31d 2408 target_add_to_state_list(cmd);
885e7b0e 2409 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2410 target_execute_cmd(cmd);
2411 return 0;
2412 }
862e6389 2413 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2414
2415 ret = cmd->se_tfo->write_pending(cmd);
2416 if (ret == -EAGAIN || ret == -ENOMEM)
2417 goto queue_full;
2418
de103c93
CH		 2419 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2420 WARN_ON(ret);
2421
b69c1fcf 2422 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2423
c3196f0c
CH		 2424queue_full:
2425 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2426 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2427 transport_handle_queue_full(cmd, cmd->se_dev);
2428 return 0;
c66ac9db 2429}
a1d8b49a 2430EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2431
e057f533 2432static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2433{
f147abb4
NB		 2434 int ret;
2435
2436 ret = cmd->se_tfo->write_pending(cmd);
2437 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2438 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2439 cmd);
2440 transport_handle_queue_full(cmd, cmd->se_dev);
2441 }
07bde79a
NB		 2442}
2443
d5ddad41 2444int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2445{
c130480b 2446 unsigned long flags;
d5ddad41
NB		 2447 int ret = 0;
2448
d14921d6 2449 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2450 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2451 transport_wait_for_tasks(cmd);
2452
d5ddad41 2453 ret = transport_release_cmd(cmd);
d14921d6
NB		 2454 } else {
2455 if (wait_for_tasks)
2456 transport_wait_for_tasks(cmd);
c130480b
NB		 2457 /*
2458 * Handle WRITE failure case where transport_generic_new_cmd()
2459 * has already added se_cmd to state_list, but fabric has
2460 * failed command before I/O submission.
2461 */
2462 if (cmd->state_active) {
2463 spin_lock_irqsave(&cmd->t_state_lock, flags);
2464 target_remove_from_state_list(cmd);
2465 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2466 }
d14921d6 2467
82f1c8a4 2468 if (cmd->se_lun)
c66ac9db 2469 transport_lun_remove_cmd(cmd);
c66ac9db 2470
d5ddad41 2471 ret = transport_put_cmd(cmd);
c66ac9db 2472 }
d5ddad41 2473 return ret;
c66ac9db
NB		 2474}
2475EXPORT_SYMBOL(transport_generic_free_cmd);
2476
a17f091d 2477/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2478 * @se_cmd: command descriptor to add
a6360785 2479 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2480 */
afc16604 2481int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2482{
afc16604 2483 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2484 unsigned long flags;
bc187ea6 2485 int ret = 0;
a17f091d 2486
a6360785
NB		 2487 /*
2488 * Add a second kref if the fabric caller is expecting to handle
2489 * fabric acknowledgement that requires two target_put_sess_cmd()
2490 * invocations before se_cmd descriptor release.
2491 */
054922bb 2492 if (ack_kref)
a6360785 2493 kref_get(&se_cmd->cmd_kref);
7481deb4 2494
a17f091d 2495 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2496 if (se_sess->sess_tearing_down) {
2497 ret = -ESHUTDOWN;
2498 goto out;
2499 }
a17f091d 2500 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2501out:
a17f091d 2502 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2503
2504 if (ret && ack_kref)
afc16604 2505 target_put_sess_cmd(se_cmd);
7544e597 2506
bc187ea6 2507 return ret;
a17f091d 2508}
20361e69 2509EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2510
7481deb4 2511static void target_release_cmd_kref(struct kref *kref)
a17f091d 2512{
7481deb4
NB		 2513 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2514 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2515 unsigned long flags;
a17f091d 2516
9ff9d15e 2517 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
a17f091d 2518 if (list_empty(&se_cmd->se_cmd_list)) {
9ff9d15e 2519 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2520 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2521 return;
a17f091d 2522 }
a17f091d 2523 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
9ff9d15e 2524 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2525 complete(&se_cmd->cmd_wait_comp);
7481deb4 2526 return;
a17f091d
NB		 2527 }
2528 list_del(&se_cmd->se_cmd_list);
9ff9d15e 2529 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2530
7481deb4
NB		 2531 se_cmd->se_tfo->release_cmd(se_cmd);
2532}
2533
2534/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2535 * @se_cmd: command descriptor to drop
2536 */
afc16604 2537int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2538{
afc16604
BVA		 2539 struct se_session *se_sess = se_cmd->se_sess;
2540
0ed6e189
NB		 2541 if (!se_sess) {
2542 se_cmd->se_tfo->release_cmd(se_cmd);
2543 return 1;
2544 }
9ff9d15e 2545 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2546}
2547EXPORT_SYMBOL(target_put_sess_cmd);
2548
1c7b13fe
RD		 2549/* target_sess_cmd_list_set_waiting - Flag all commands in
2550 * sess_cmd_list to complete cmd_wait_comp. Set
2551 * sess_tearing_down so no more commands are queued.
2552 * @se_sess: session to flag
a17f091d 2553 */
1c7b13fe 2554void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2555{
2556 struct se_cmd *se_cmd;
2557 unsigned long flags;
2558
a17f091d 2559 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2560 if (se_sess->sess_tearing_down) {
2561 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2562 return;
2563 }
1c7b13fe 2564 se_sess->sess_tearing_down = 1;
9b31a328 2565 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2566
9b31a328 2567 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2568 se_cmd->cmd_wait_set = 1;
2569
2570 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2571}
1c7b13fe 2572EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2573
2574/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2575 * @se_sess: session to wait for active I/O
a17f091d 2576 */
be646c2d 2577void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2578{
2579 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2580 unsigned long flags;
a17f091d
NB		 2581
2582 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2583 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2584 list_del(&se_cmd->se_cmd_list);
2585
2586 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2587 " %d\n", se_cmd, se_cmd->t_state,
2588 se_cmd->se_tfo->get_cmd_state(se_cmd));
2589
be646c2d
JE		 2590 wait_for_completion(&se_cmd->cmd_wait_comp);
2591 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2592 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2593 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2594
2595 se_cmd->se_tfo->release_cmd(se_cmd);
2596 }
9b31a328
NB		 2597
2598 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2599 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2600 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2601
a17f091d
NB		 2602}
2603EXPORT_SYMBOL(target_wait_for_sess_cmds);
2604
b3eeea66 2605void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2606{
5277797d 2607 percpu_ref_kill(&lun->lun_ref);
5277797d 2608 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2609}
2610
d14921d6
NB		 2611/**
2612 * transport_wait_for_tasks - wait for completion to occur
2613 * @cmd: command to wait
c66ac9db 2614 *
d14921d6
NB		 2615 * Called from frontend fabric context to wait for storage engine
2616 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2617 */
a17f091d 2618bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2619{
2620 unsigned long flags;
2621
a1d8b49a 2622 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2623 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2624 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2626 return false;
d14921d6 2627 }
cb4f4d3c 2628
c8e31f26
AG		 2629 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2630 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2631 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2632 return false;
d14921d6 2633 }
7d680f3b 2634
3d28934a 2635 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2636 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2637 return false;
d14921d6 2638 }
c66ac9db 2639
7d680f3b 2640 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2641
649ee054
BVA		 2642 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d, t_state: %d, CMD_T_STOP\n",
2643 cmd, cmd->tag, cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2644
a1d8b49a 2645 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2646
a1d8b49a 2647 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2648
a1d8b49a 2649 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2650 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2651
649ee054
BVA		 2652 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->t_transport_stop_comp) for ITT: 0x%08llx\n",
2653 cmd->tag);
c66ac9db 2654
d14921d6 2655 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2656
2657 return true;
c66ac9db 2658}
d14921d6 2659EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2660
ab78fef4
BVA		 2661struct sense_info {
2662 u8 key;
2663 u8 asc;
2664 u8 ascq;
2665 bool add_sector_info;
2666};
2667
2668static const struct sense_info sense_info_table[] = {
2669 [TCM_NO_SENSE] = {
2670 .key = NOT_READY
2671 },
2672 [TCM_NON_EXISTENT_LUN] = {
2673 .key = ILLEGAL_REQUEST,
2674 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2675 },
2676 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2677 .key = ILLEGAL_REQUEST,
2678 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2679 },
2680 [TCM_SECTOR_COUNT_TOO_MANY] = {
2681 .key = ILLEGAL_REQUEST,
2682 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2683 },
2684 [TCM_UNKNOWN_MODE_PAGE] = {
2685 .key = ILLEGAL_REQUEST,
2686 .asc = 0x24, /* INVALID FIELD IN CDB */
2687 },
2688 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2689 .key = ABORTED_COMMAND,
2690 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2691 .ascq = 0x03,
2692 },
2693 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2694 .key = ABORTED_COMMAND,
2695 .asc = 0x0c, /* WRITE ERROR */
2696 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2697 },
2698 [TCM_INVALID_CDB_FIELD] = {
2699 .key = ILLEGAL_REQUEST,
2700 .asc = 0x24, /* INVALID FIELD IN CDB */
2701 },
2702 [TCM_INVALID_PARAMETER_LIST] = {
2703 .key = ILLEGAL_REQUEST,
2704 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2705 },
2706 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2707 .key = ILLEGAL_REQUEST,
2708 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2709 },
2710 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2711 .key = ILLEGAL_REQUEST,
2712 .asc = 0x0c, /* WRITE ERROR */
2713 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2714 },
2715 [TCM_SERVICE_CRC_ERROR] = {
2716 .key = ABORTED_COMMAND,
2717 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2718 .ascq = 0x05, /* N/A */
2719 },
2720 [TCM_SNACK_REJECTED] = {
2721 .key = ABORTED_COMMAND,
2722 .asc = 0x11, /* READ ERROR */
2723 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2724 },
2725 [TCM_WRITE_PROTECTED] = {
2726 .key = DATA_PROTECT,
2727 .asc = 0x27, /* WRITE PROTECTED */
2728 },
2729 [TCM_ADDRESS_OUT_OF_RANGE] = {
2730 .key = ILLEGAL_REQUEST,
2731 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2732 },
2733 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2734 .key = UNIT_ATTENTION,
2735 },
2736 [TCM_CHECK_CONDITION_NOT_READY] = {
2737 .key = NOT_READY,
2738 },
2739 [TCM_MISCOMPARE_VERIFY] = {
2740 .key = MISCOMPARE,
2741 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2742 .ascq = 0x00,
2743 },
2744 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2745 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2746 .asc = 0x10,
2747 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2748 .add_sector_info = true,
2749 },
2750 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2751 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2752 .asc = 0x10,
2753 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2754 .add_sector_info = true,
2755 },
2756 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2757 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2758 .asc = 0x10,
2759 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2760 .add_sector_info = true,
2761 },
2762 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2763 /*
2764 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2765 * Solaris initiators. Returning NOT READY instead means the
2766 * operations will be retried a finite number of times and we
2767 * can survive intermittent errors.
2768 */
2769 .key = NOT_READY,
2770 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2771 },
2772};
2773
f5a8b3a7 2774static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2775{
2776 const struct sense_info *si;
2777 u8 *buffer = cmd->sense_buffer;
2778 int r = (__force int)reason;
2779 u8 asc, ascq;
4e4937e8 2780 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 2781
2782 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2783 si = &sense_info_table[r];
2784 else
2785 si = &sense_info_table[(__force int)
2786 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2787
ab78fef4
BVA		 2788 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2789 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2790 WARN_ON_ONCE(asc == 0);
2791 } else if (si->asc == 0) {
2792 WARN_ON_ONCE(cmd->scsi_asc == 0);
2793 asc = cmd->scsi_asc;
2794 ascq = cmd->scsi_ascq;
2795 } else {
2796 asc = si->asc;
2797 ascq = si->ascq;
2798 }
9ec1e1ce 2799
4e4937e8 2800 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 2801 if (si->add_sector_info)
f5a8b3a7
SG		 2802 return scsi_set_sense_information(buffer,
2803 cmd->scsi_sense_length,
2804 cmd->bad_sector);
2805
2806 return 0;
ab78fef4
BVA		 2807}
2808
de103c93
CH		 2809int
2810transport_send_check_condition_and_sense(struct se_cmd *cmd,
2811 sense_reason_t reason, int from_transport)
c66ac9db 2812{
c66ac9db 2813 unsigned long flags;
c66ac9db 2814
a1d8b49a 2815 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2816 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2817 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2818 return 0;
2819 }
2820 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2821 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2822
ab78fef4 2823 if (!from_transport) {
f5a8b3a7
SG		 2824 int rc;
2825
c66ac9db 2826 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 2827 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2828 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 2829 rc = translate_sense_reason(cmd, reason);
2830 if (rc)
2831 return rc;
c66ac9db 2832 }
c66ac9db 2833
e5c0d6ad 2834 trace_target_cmd_complete(cmd);
07bde79a 2835 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2836}
2837EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2838
2839int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2840{
c18bc7d8
RD		 2841 if (!(cmd->transport_state & CMD_T_ABORTED))
2842 return 0;
c66ac9db 2843
68259b5a
AL		 2844 /*
2845 * If cmd has been aborted but either no status is to be sent or it has
2846 * already been sent, just return
2847 */
2848 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
c18bc7d8 2849 return 1;
8b1e1244 2850
649ee054
BVA		 2851 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08llx\n",
2852 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2853
68259b5a 2854 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2855 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2856 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2857 cmd->se_tfo->queue_status(cmd);
2858
2859 return 1;
c66ac9db
NB		 2860}
2861EXPORT_SYMBOL(transport_check_aborted_status);
2862
2863void transport_send_task_abort(struct se_cmd *cmd)
2864{
c252f003
NB		 2865 unsigned long flags;
2866
2867 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2868 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2869 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2870 return;
2871 }
2872 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2873
c66ac9db
NB		 2874 /*
2875 * If there are still expected incoming fabric WRITEs, we wait
2876 * until until they have completed before sending a TASK_ABORTED
2877 * response. This response with TASK_ABORTED status will be
2878 * queued back to fabric module by transport_check_aborted_status().
2879 */
2880 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2881 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2882 cmd->transport_state |= CMD_T_ABORTED;
68259b5a 2883 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
29f4c090 2884 return;
c66ac9db
NB		 2885 }
2886 }
2887 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2888
72b59d6e
RD		 2889 transport_lun_remove_cmd(cmd);
2890
649ee054
BVA		 2891 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
2892 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2893
e5c0d6ad 2894 trace_target_cmd_complete(cmd);
e3d6f909 2895 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2896}
2897
af877292 2898static void target_tmr_work(struct work_struct *work)
c66ac9db 2899{
af877292 2900 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2901 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2902 struct se_tmr_req *tmr = cmd->se_tmr_req;
2903 int ret;
2904
2905 switch (tmr->function) {
5c6cd613 2906 case TMR_ABORT_TASK:
3d28934a 2907 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2908 break;
5c6cd613
NB		 2909 case TMR_ABORT_TASK_SET:
2910 case TMR_CLEAR_ACA:
2911 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2912 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2913 break;
5c6cd613 2914 case TMR_LUN_RESET:
c66ac9db
NB		 2915 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2916 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2917 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 2918 if (tmr->response == TMR_FUNCTION_COMPLETE) {
2919 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
2920 cmd->orig_fe_lun, 0x29,
2921 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
2922 }
c66ac9db 2923 break;
5c6cd613 2924 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2925 tmr->response = TMR_FUNCTION_REJECTED;
2926 break;
5c6cd613 2927 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2928 tmr->response = TMR_FUNCTION_REJECTED;
2929 break;
c66ac9db 2930 default:
6708bb27 2931 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2932 tmr->function);
2933 tmr->response = TMR_FUNCTION_REJECTED;
2934 break;
2935 }
2936
2937 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2938 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2939
b7b8bef7 2940 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2941}
2942
af877292
CH		 2943int transport_generic_handle_tmr(
2944 struct se_cmd *cmd)
c66ac9db 2945{
f15e9cd9
NB		 2946 unsigned long flags;
2947
2948 spin_lock_irqsave(&cmd->t_state_lock, flags);
2949 cmd->transport_state |= CMD_T_ACTIVE;
2950 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2951
af877292
CH		 2952 INIT_WORK(&cmd->work, target_tmr_work);
2953 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2954 return 0;
2955}
af877292 2956EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 2957
2958bool
2959target_check_wce(struct se_device *dev)
2960{
2961 bool wce = false;
2962
2963 if (dev->transport->get_write_cache)
2964 wce = dev->transport->get_write_cache(dev);
2965 else if (dev->dev_attrib.emulate_write_cache > 0)
2966 wce = true;
2967
2968 return wce;
2969}
2970
2971bool
2972target_check_fua(struct se_device *dev)
2973{
2974 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
2975}