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iser-target: Fix leak on failure in isert_conn_create_fastreg_pool
[deliverable/linux.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>
c66ac9db
NB		 37#include <asm/unaligned.h>
38#include <net/sock.h>
39#include <net/tcp.h>
40#include <scsi/scsi.h>
41#include <scsi/scsi_cmnd.h>
e66ecd50 42#include <scsi/scsi_tcq.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
NB		 47#include <target/target_core_configfs.h>
48
e26d99ae 49#include "target_core_internal.h"
c66ac9db 50#include "target_core_alua.h"
c66ac9db 51#include "target_core_pr.h"
c66ac9db
NB		 52#include "target_core_ua.h"
53
e5c0d6ad
RD		 54#define CREATE_TRACE_POINTS
55#include <trace/events/target.h>
56
35e0e757 57static struct workqueue_struct *target_completion_wq;
c66ac9db 58static struct kmem_cache *se_sess_cache;
c66ac9db 59struct kmem_cache *se_ua_cache;
c66ac9db
NB		 60struct kmem_cache *t10_pr_reg_cache;
61struct kmem_cache *t10_alua_lu_gp_cache;
62struct kmem_cache *t10_alua_lu_gp_mem_cache;
63struct kmem_cache *t10_alua_tg_pt_gp_cache;
64struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
229d4f11
HR		 65struct kmem_cache *t10_alua_lba_map_cache;
66struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 67
c66ac9db 68static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 69static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 70 struct se_device *dev);
d5ddad41 71static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 72static void target_complete_ok_work(struct work_struct *work);
c66ac9db 73
e3d6f909 74int init_se_kmem_caches(void)
c66ac9db 75{
c66ac9db
NB		 76 se_sess_cache = kmem_cache_create("se_sess_cache",
77 sizeof(struct se_session), __alignof__(struct se_session),
78 0, NULL);
6708bb27
AG		 79 if (!se_sess_cache) {
80 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 81 " failed\n");
c8e31f26 82 goto out;
c66ac9db
NB		 83 }
84 se_ua_cache = kmem_cache_create("se_ua_cache",
85 sizeof(struct se_ua), __alignof__(struct se_ua),
86 0, NULL);
6708bb27
AG		 87 if (!se_ua_cache) {
88 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 89 goto out_free_sess_cache;
c66ac9db 90 }
c66ac9db
NB		 91 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
92 sizeof(struct t10_pr_registration),
93 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 94 if (!t10_pr_reg_cache) {
95 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 96 " failed\n");
35e0e757 97 goto out_free_ua_cache;
c66ac9db
NB		 98 }
99 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
100 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
101 0, NULL);
6708bb27
AG		 102 if (!t10_alua_lu_gp_cache) {
103 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 104 " failed\n");
35e0e757 105 goto out_free_pr_reg_cache;
c66ac9db
NB		 106 }
107 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
108 sizeof(struct t10_alua_lu_gp_member),
109 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 110 if (!t10_alua_lu_gp_mem_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 112 "cache failed\n");
35e0e757 113 goto out_free_lu_gp_cache;
c66ac9db
NB		 114 }
115 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
116 sizeof(struct t10_alua_tg_pt_gp),
117 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 118 if (!t10_alua_tg_pt_gp_cache) {
119 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 120 "cache failed\n");
35e0e757 121 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 122 }
123 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
124 "t10_alua_tg_pt_gp_mem_cache",
125 sizeof(struct t10_alua_tg_pt_gp_member),
126 __alignof__(struct t10_alua_tg_pt_gp_member),
127 0, NULL);
6708bb27
AG		 128 if (!t10_alua_tg_pt_gp_mem_cache) {
129 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 130 "mem_t failed\n");
35e0e757 131 goto out_free_tg_pt_gp_cache;
c66ac9db 132 }
229d4f11
HR		 133 t10_alua_lba_map_cache = kmem_cache_create(
134 "t10_alua_lba_map_cache",
135 sizeof(struct t10_alua_lba_map),
136 __alignof__(struct t10_alua_lba_map), 0, NULL);
137 if (!t10_alua_lba_map_cache) {
138 pr_err("kmem_cache_create() for t10_alua_lba_map_"
139 "cache failed\n");
140 goto out_free_tg_pt_gp_mem_cache;
141 }
142 t10_alua_lba_map_mem_cache = kmem_cache_create(
143 "t10_alua_lba_map_mem_cache",
144 sizeof(struct t10_alua_lba_map_member),
145 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
146 if (!t10_alua_lba_map_mem_cache) {
147 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
148 "cache failed\n");
149 goto out_free_lba_map_cache;
150 }
c66ac9db 151
35e0e757
CH		 152 target_completion_wq = alloc_workqueue("target_completion",
153 WQ_MEM_RECLAIM, 0);
154 if (!target_completion_wq)
229d4f11 155 goto out_free_lba_map_mem_cache;
35e0e757 156
c66ac9db 157 return 0;
35e0e757 158
229d4f11
HR		 159out_free_lba_map_mem_cache:
160 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
161out_free_lba_map_cache:
162 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 163out_free_tg_pt_gp_mem_cache:
164 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
165out_free_tg_pt_gp_cache:
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
167out_free_lu_gp_mem_cache:
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
169out_free_lu_gp_cache:
170 kmem_cache_destroy(t10_alua_lu_gp_cache);
171out_free_pr_reg_cache:
172 kmem_cache_destroy(t10_pr_reg_cache);
173out_free_ua_cache:
174 kmem_cache_destroy(se_ua_cache);
175out_free_sess_cache:
176 kmem_cache_destroy(se_sess_cache);
c66ac9db 177out:
e3d6f909 178 return -ENOMEM;
c66ac9db
NB		 179}
180
e3d6f909 181void release_se_kmem_caches(void)
c66ac9db 182{
35e0e757 183 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 184 kmem_cache_destroy(se_sess_cache);
185 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 186 kmem_cache_destroy(t10_pr_reg_cache);
187 kmem_cache_destroy(t10_alua_lu_gp_cache);
188 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
229d4f11
HR		 191 kmem_cache_destroy(t10_alua_lba_map_cache);
192 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 193}
194
e3d6f909
AG		 195/* This code ensures unique mib indexes are handed out. */
196static DEFINE_SPINLOCK(scsi_mib_index_lock);
197static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 198
199/*
200 * Allocate a new row index for the entry type specified
201 */
202u32 scsi_get_new_index(scsi_index_t type)
203{
204 u32 new_index;
205
e3d6f909 206 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 207
e3d6f909
AG		 208 spin_lock(&scsi_mib_index_lock);
209 new_index = ++scsi_mib_index[type];
210 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 211
212 return new_index;
213}
214
dbc5623e 215void transport_subsystem_check_init(void)
c66ac9db
NB		 216{
217 int ret;
283669d2 218 static int sub_api_initialized;
c66ac9db 219
dbc5623e
NB		 220 if (sub_api_initialized)
221 return;
222
c66ac9db
NB		 223 ret = request_module("target_core_iblock");
224 if (ret != 0)
6708bb27 225 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 226
227 ret = request_module("target_core_file");
228 if (ret != 0)
6708bb27 229 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 230
231 ret = request_module("target_core_pscsi");
232 if (ret != 0)
6708bb27 233 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 234
e3d6f909 235 sub_api_initialized = 1;
c66ac9db
NB		 236}
237
238struct se_session *transport_init_session(void)
239{
240 struct se_session *se_sess;
241
242 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 243 if (!se_sess) {
244 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 245 " se_sess_cache\n");
246 return ERR_PTR(-ENOMEM);
247 }
248 INIT_LIST_HEAD(&se_sess->sess_list);
249 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 250 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 251 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 252 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 253 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 254
255 return se_sess;
256}
257EXPORT_SYMBOL(transport_init_session);
258
c0add7fd
NB		 259int transport_alloc_session_tags(struct se_session *se_sess,
260 unsigned int tag_num, unsigned int tag_size)
261{
262 int rc;
263
8c7f6e9b
NB		 264 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
265 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 266 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 267 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
268 if (!se_sess->sess_cmd_map) {
269 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
270 return -ENOMEM;
271 }
c0add7fd
NB		 272 }
273
274 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
275 if (rc < 0) {
276 pr_err("Unable to init se_sess->sess_tag_pool,"
277 " tag_num: %u\n", tag_num);
8c7f6e9b
NB		 278 if (is_vmalloc_addr(se_sess->sess_cmd_map))
279 vfree(se_sess->sess_cmd_map);
280 else
281 kfree(se_sess->sess_cmd_map);
c0add7fd
NB		 282 se_sess->sess_cmd_map = NULL;
283 return -ENOMEM;
284 }
285
286 return 0;
287}
288EXPORT_SYMBOL(transport_alloc_session_tags);
289
290struct se_session *transport_init_session_tags(unsigned int tag_num,
291 unsigned int tag_size)
292{
293 struct se_session *se_sess;
294 int rc;
295
296 se_sess = transport_init_session();
297 if (IS_ERR(se_sess))
298 return se_sess;
299
300 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
301 if (rc < 0) {
302 transport_free_session(se_sess);
303 return ERR_PTR(-ENOMEM);
304 }
305
306 return se_sess;
307}
308EXPORT_SYMBOL(transport_init_session_tags);
309
c66ac9db 310/*
140854cb 311 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 312 */
313void __transport_register_session(
314 struct se_portal_group *se_tpg,
315 struct se_node_acl *se_nacl,
316 struct se_session *se_sess,
317 void *fabric_sess_ptr)
318{
319 unsigned char buf[PR_REG_ISID_LEN];
320
321 se_sess->se_tpg = se_tpg;
322 se_sess->fabric_sess_ptr = fabric_sess_ptr;
323 /*
324 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
325 *
326 * Only set for struct se_session's that will actually be moving I/O.
327 * eg: *NOT* discovery sessions.
328 */
329 if (se_nacl) {
330 /*
331 * If the fabric module supports an ISID based TransportID,
332 * save this value in binary from the fabric I_T Nexus now.
333 */
e3d6f909 334 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 335 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 336 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 337 &buf[0], PR_REG_ISID_LEN);
338 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
339 }
afb999ff
NB		 340 kref_get(&se_nacl->acl_kref);
341
c66ac9db
NB		 342 spin_lock_irq(&se_nacl->nacl_sess_lock);
343 /*
344 * The se_nacl->nacl_sess pointer will be set to the
345 * last active I_T Nexus for each struct se_node_acl.
346 */
347 se_nacl->nacl_sess = se_sess;
348
349 list_add_tail(&se_sess->sess_acl_list,
350 &se_nacl->acl_sess_list);
351 spin_unlock_irq(&se_nacl->nacl_sess_lock);
352 }
353 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
354
6708bb27 355 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 356 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 357}
358EXPORT_SYMBOL(__transport_register_session);
359
360void transport_register_session(
361 struct se_portal_group *se_tpg,
362 struct se_node_acl *se_nacl,
363 struct se_session *se_sess,
364 void *fabric_sess_ptr)
365{
140854cb
NB		 366 unsigned long flags;
367
368 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 369 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 370 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 371}
372EXPORT_SYMBOL(transport_register_session);
373
ecf0dd66 374static void target_release_session(struct kref *kref)
41ac82b6
NB		 375{
376 struct se_session *se_sess = container_of(kref,
377 struct se_session, sess_kref);
378 struct se_portal_group *se_tpg = se_sess->se_tpg;
379
380 se_tpg->se_tpg_tfo->close_session(se_sess);
381}
382
383void target_get_session(struct se_session *se_sess)
384{
385 kref_get(&se_sess->sess_kref);
386}
387EXPORT_SYMBOL(target_get_session);
388
33933a0e 389void target_put_session(struct se_session *se_sess)
41ac82b6 390{
4149268e
JE		 391 struct se_portal_group *tpg = se_sess->se_tpg;
392
393 if (tpg->se_tpg_tfo->put_session != NULL) {
394 tpg->se_tpg_tfo->put_session(se_sess);
395 return;
396 }
33933a0e 397 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 398}
399EXPORT_SYMBOL(target_put_session);
400
afb999ff
NB		 401static void target_complete_nacl(struct kref *kref)
402{
403 struct se_node_acl *nacl = container_of(kref,
404 struct se_node_acl, acl_kref);
405
406 complete(&nacl->acl_free_comp);
407}
408
409void target_put_nacl(struct se_node_acl *nacl)
410{
411 kref_put(&nacl->acl_kref, target_complete_nacl);
412}
413
c66ac9db
NB		 414void transport_deregister_session_configfs(struct se_session *se_sess)
415{
416 struct se_node_acl *se_nacl;
23388864 417 unsigned long flags;
c66ac9db
NB		 418 /*
419 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
420 */
421 se_nacl = se_sess->se_node_acl;
6708bb27 422 if (se_nacl) {
23388864 423 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 424 if (se_nacl->acl_stop == 0)
425 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 426 /*
427 * If the session list is empty, then clear the pointer.
428 * Otherwise, set the struct se_session pointer from the tail
429 * element of the per struct se_node_acl active session list.
430 */
431 if (list_empty(&se_nacl->acl_sess_list))
432 se_nacl->nacl_sess = NULL;
433 else {
434 se_nacl->nacl_sess = container_of(
435 se_nacl->acl_sess_list.prev,
436 struct se_session, sess_acl_list);
437 }
23388864 438 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 439 }
440}
441EXPORT_SYMBOL(transport_deregister_session_configfs);
442
443void transport_free_session(struct se_session *se_sess)
444{
c0add7fd
NB		 445 if (se_sess->sess_cmd_map) {
446 percpu_ida_destroy(&se_sess->sess_tag_pool);
8c7f6e9b
NB		 447 if (is_vmalloc_addr(se_sess->sess_cmd_map))
448 vfree(se_sess->sess_cmd_map);
449 else
450 kfree(se_sess->sess_cmd_map);
c0add7fd 451 }
c66ac9db
NB		 452 kmem_cache_free(se_sess_cache, se_sess);
453}
454EXPORT_SYMBOL(transport_free_session);
455
456void transport_deregister_session(struct se_session *se_sess)
457{
458 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 459 struct target_core_fabric_ops *se_tfo;
c66ac9db 460 struct se_node_acl *se_nacl;
e63a8e19 461 unsigned long flags;
01468346 462 bool comp_nacl = true;
c66ac9db 463
6708bb27 464 if (!se_tpg) {
c66ac9db
NB		 465 transport_free_session(se_sess);
466 return;
467 }
01468346 468 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 469
e63a8e19 470 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 471 list_del(&se_sess->sess_list);
472 se_sess->se_tpg = NULL;
473 se_sess->fabric_sess_ptr = NULL;
e63a8e19 474 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 475
476 /*
477 * Determine if we need to do extra work for this initiator node's
478 * struct se_node_acl if it had been previously dynamically generated.
479 */
480 se_nacl = se_sess->se_node_acl;
01468346
NB		 481
482 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
483 if (se_nacl && se_nacl->dynamic_node_acl) {
484 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
485 list_del(&se_nacl->acl_list);
486 se_tpg->num_node_acls--;
487 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
488 core_tpg_wait_for_nacl_pr_ref(se_nacl);
489 core_free_device_list_for_node(se_nacl, se_tpg);
490 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
491
492 comp_nacl = false;
493 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 494 }
c66ac9db 495 }
01468346 496 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 497
6708bb27 498 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 499 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 500 /*
125d0119 501 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff
NB		 502 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
503 * removal context.
01468346
NB		 504 */
505 if (se_nacl && comp_nacl == true)
afb999ff 506 target_put_nacl(se_nacl);
01468346 507
afb999ff 508 transport_free_session(se_sess);
c66ac9db
NB		 509}
510EXPORT_SYMBOL(transport_deregister_session);
511
512/*
a1d8b49a 513 * Called with cmd->t_state_lock held.
c66ac9db 514 */
cf572a96 515static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 516{
42bf829e 517 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 518 unsigned long flags;
519
42bf829e
CH		 520 if (!dev)
521 return;
c66ac9db 522
cf572a96
CH		 523 if (cmd->transport_state & CMD_T_BUSY)
524 return;
c66ac9db 525
cf572a96
CH		 526 spin_lock_irqsave(&dev->execute_task_lock, flags);
527 if (cmd->state_active) {
528 list_del(&cmd->state_list);
cf572a96 529 cmd->state_active = false;
c66ac9db 530 }
cf572a96 531 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 532}
533
862e6389
NB		 534static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
535 bool write_pending)
c66ac9db
NB		 536{
537 unsigned long flags;
538
a1d8b49a 539 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 540 if (write_pending)
541 cmd->t_state = TRANSPORT_WRITE_PENDING;
542
f7113a47
CH		 543 if (remove_from_lists) {
544 target_remove_from_state_list(cmd);
545
546 /*
547 * Clear struct se_cmd->se_lun before the handoff to FE.
548 */
549 cmd->se_lun = NULL;
550 }
551
c66ac9db
NB		 552 /*
553 * Determine if frontend context caller is requesting the stopping of
e3d6f909 554 * this command for frontend exceptions.
c66ac9db 555 */
7d680f3b
CH		 556 if (cmd->transport_state & CMD_T_STOP) {
557 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
558 __func__, __LINE__,
e3d6f909 559 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 560
a1d8b49a 561 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 562
a1d8b49a 563 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 564 return 1;
565 }
f7113a47
CH		 566
567 cmd->transport_state &= ~CMD_T_ACTIVE;
568 if (remove_from_lists) {
569 /*
570 * Some fabric modules like tcm_loop can release
571 * their internally allocated I/O reference now and
572 * struct se_cmd now.
573 *
574 * Fabric modules are expected to return '1' here if the
575 * se_cmd being passed is released at this point,
576 * or zero if not being released.
577 */
578 if (cmd->se_tfo->check_stop_free != NULL) {
579 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
580 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 581 }
f7113a47 582 }
c66ac9db 583
a1d8b49a 584 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 585 return 0;
586}
587
588static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
589{
862e6389 590 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 591}
592
593static void transport_lun_remove_cmd(struct se_cmd *cmd)
594{
e3d6f909 595 struct se_lun *lun = cmd->se_lun;
c66ac9db 596
5259a06e 597 if (!lun)
c66ac9db
NB		 598 return;
599
5259a06e
NB		 600 if (cmpxchg(&cmd->lun_ref_active, true, false))
601 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 602}
603
604void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
605{
c66ac9db
NB		 606 if (transport_cmd_check_stop_to_fabric(cmd))
607 return;
af877292 608 if (remove)
e6a2573f 609 transport_put_cmd(cmd);
c66ac9db
NB		 610}
611
35e0e757
CH		 612static void target_complete_failure_work(struct work_struct *work)
613{
614 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
615
de103c93
CH		 616 transport_generic_request_failure(cmd,
617 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 618}
619
6138ed2a 620/*
d5829eac
PB		 621 * Used when asking transport to copy Sense Data from the underlying
622 * Linux/SCSI struct scsi_cmnd
6138ed2a 623 */
d5829eac 624static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 625{
6138ed2a 626 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 627
628 WARN_ON(!cmd->se_lun);
629
630 if (!dev)
d5829eac 631 return NULL;
6138ed2a 632
d5829eac
PB		 633 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
634 return NULL;
6138ed2a 635
9c58b7dd 636 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 637
d5829eac 638 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 639 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 640 return cmd->sense_buffer;
6138ed2a
PB		 641}
642
5787cacd 643void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 644{
42bf829e 645 struct se_device *dev = cmd->se_dev;
5787cacd 646 int success = scsi_status == GOOD;
c66ac9db 647 unsigned long flags;
c66ac9db 648
5787cacd
CH		 649 cmd->scsi_status = scsi_status;
650
651
a1d8b49a 652 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 653 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 654
c66ac9db 655 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 656 dev->transport->transport_complete(cmd,
657 cmd->t_data_sg,
658 transport_get_sense_buffer(cmd));
659 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 660 success = 1;
c66ac9db
NB		 661 }
662
663 /*
5787cacd 664 * See if we are waiting to complete for an exception condition.
c66ac9db 665 */
cf572a96 666 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 667 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 668 complete(&cmd->task_stop_comp);
c66ac9db
NB		 669 return;
670 }
2235007c
CH		 671
672 if (!success)
7d680f3b 673 cmd->transport_state |= CMD_T_FAILED;
2235007c 674
3d28934a 675 /*
125d0119 676 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 677 * and transport_wait_for_tasks() will be waiting for completion..
678 */
679 if (cmd->transport_state & CMD_T_ABORTED &&
680 cmd->transport_state & CMD_T_STOP) {
681 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
682 complete(&cmd->t_transport_stop_comp);
683 return;
684 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 685 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 686 } else {
35e0e757 687 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 688 }
35e0e757 689
35e0e757 690 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 691 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 692 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 693
35e0e757 694 queue_work(target_completion_wq, &cmd->work);
c66ac9db 695}
6bb35e00
CH		 696EXPORT_SYMBOL(target_complete_cmd);
697
cf572a96 698static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 699{
cf572a96
CH		 700 struct se_device *dev = cmd->se_dev;
701 unsigned long flags;
c66ac9db 702
cf572a96
CH		 703 spin_lock_irqsave(&dev->execute_task_lock, flags);
704 if (!cmd->state_active) {
705 list_add_tail(&cmd->state_list, &dev->state_list);
706 cmd->state_active = true;
c66ac9db 707 }
cf572a96 708 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 709}
710
07bde79a 711/*
f147abb4 712 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 713 */
7a6f0a1e
CH		 714static void transport_write_pending_qf(struct se_cmd *cmd);
715static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 716
0fd97ccf 717void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 718{
719 struct se_device *dev = container_of(work, struct se_device,
720 qf_work_queue);
bcac364a 721 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 722 struct se_cmd *cmd, *cmd_tmp;
723
724 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 725 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
726 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 727
bcac364a 728 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 729 list_del(&cmd->se_qf_node);
730 atomic_dec(&dev->dev_qf_count);
731 smp_mb__after_atomic_dec();
07bde79a 732
6708bb27 733 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 734 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 735 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 736 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
737 : "UNKNOWN");
f7a5cc0b 738
7a6f0a1e
CH		 739 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
740 transport_write_pending_qf(cmd);
741 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
742 transport_complete_qf(cmd);
07bde79a 743 }
07bde79a
NB		 744}
745
c66ac9db
NB		 746unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
747{
748 switch (cmd->data_direction) {
749 case DMA_NONE:
750 return "NONE";
751 case DMA_FROM_DEVICE:
752 return "READ";
753 case DMA_TO_DEVICE:
754 return "WRITE";
755 case DMA_BIDIRECTIONAL:
756 return "BIDI";
757 default:
758 break;
759 }
760
761 return "UNKNOWN";
762}
763
764void transport_dump_dev_state(
765 struct se_device *dev,
766 char *b,
767 int *bl)
768{
769 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 770 if (dev->export_count)
c66ac9db 771 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 772 else
c66ac9db 773 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 774
5f41a31d 775 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 776 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 777 dev->dev_attrib.block_size,
778 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 779 *bl += sprintf(b + *bl, " ");
780}
781
c66ac9db
NB		 782void transport_dump_vpd_proto_id(
783 struct t10_vpd *vpd,
784 unsigned char *p_buf,
785 int p_buf_len)
786{
787 unsigned char buf[VPD_TMP_BUF_SIZE];
788 int len;
789
790 memset(buf, 0, VPD_TMP_BUF_SIZE);
791 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
792
793 switch (vpd->protocol_identifier) {
794 case 0x00:
795 sprintf(buf+len, "Fibre Channel\n");
796 break;
797 case 0x10:
798 sprintf(buf+len, "Parallel SCSI\n");
799 break;
800 case 0x20:
801 sprintf(buf+len, "SSA\n");
802 break;
803 case 0x30:
804 sprintf(buf+len, "IEEE 1394\n");
805 break;
806 case 0x40:
807 sprintf(buf+len, "SCSI Remote Direct Memory Access"
808 " Protocol\n");
809 break;
810 case 0x50:
811 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
812 break;
813 case 0x60:
814 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
815 break;
816 case 0x70:
817 sprintf(buf+len, "Automation/Drive Interface Transport"
818 " Protocol\n");
819 break;
820 case 0x80:
821 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
822 break;
823 default:
824 sprintf(buf+len, "Unknown 0x%02x\n",
825 vpd->protocol_identifier);
826 break;
827 }
828
829 if (p_buf)
830 strncpy(p_buf, buf, p_buf_len);
831 else
6708bb27 832 pr_debug("%s", buf);
c66ac9db
NB		 833}
834
835void
836transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
837{
838 /*
839 * Check if the Protocol Identifier Valid (PIV) bit is set..
840 *
841 * from spc3r23.pdf section 7.5.1
842 */
843 if (page_83[1] & 0x80) {
844 vpd->protocol_identifier = (page_83[0] & 0xf0);
845 vpd->protocol_identifier_set = 1;
846 transport_dump_vpd_proto_id(vpd, NULL, 0);
847 }
848}
849EXPORT_SYMBOL(transport_set_vpd_proto_id);
850
851int transport_dump_vpd_assoc(
852 struct t10_vpd *vpd,
853 unsigned char *p_buf,
854 int p_buf_len)
855{
856 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 857 int ret = 0;
858 int len;
c66ac9db
NB		 859
860 memset(buf, 0, VPD_TMP_BUF_SIZE);
861 len = sprintf(buf, "T10 VPD Identifier Association: ");
862
863 switch (vpd->association) {
864 case 0x00:
865 sprintf(buf+len, "addressed logical unit\n");
866 break;
867 case 0x10:
868 sprintf(buf+len, "target port\n");
869 break;
870 case 0x20:
871 sprintf(buf+len, "SCSI target device\n");
872 break;
873 default:
874 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 875 ret = -EINVAL;
c66ac9db
NB		 876 break;
877 }
878
879 if (p_buf)
880 strncpy(p_buf, buf, p_buf_len);
881 else
6708bb27 882 pr_debug("%s", buf);
c66ac9db
NB		 883
884 return ret;
885}
886
887int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
888{
889 /*
890 * The VPD identification association..
891 *
892 * from spc3r23.pdf Section 7.6.3.1 Table 297
893 */
894 vpd->association = (page_83[1] & 0x30);
895 return transport_dump_vpd_assoc(vpd, NULL, 0);
896}
897EXPORT_SYMBOL(transport_set_vpd_assoc);
898
899int transport_dump_vpd_ident_type(
900 struct t10_vpd *vpd,
901 unsigned char *p_buf,
902 int p_buf_len)
903{
904 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 905 int ret = 0;
906 int len;
c66ac9db
NB		 907
908 memset(buf, 0, VPD_TMP_BUF_SIZE);
909 len = sprintf(buf, "T10 VPD Identifier Type: ");
910
911 switch (vpd->device_identifier_type) {
912 case 0x00:
913 sprintf(buf+len, "Vendor specific\n");
914 break;
915 case 0x01:
916 sprintf(buf+len, "T10 Vendor ID based\n");
917 break;
918 case 0x02:
919 sprintf(buf+len, "EUI-64 based\n");
920 break;
921 case 0x03:
922 sprintf(buf+len, "NAA\n");
923 break;
924 case 0x04:
925 sprintf(buf+len, "Relative target port identifier\n");
926 break;
927 case 0x08:
928 sprintf(buf+len, "SCSI name string\n");
929 break;
930 default:
931 sprintf(buf+len, "Unsupported: 0x%02x\n",
932 vpd->device_identifier_type);
e3d6f909 933 ret = -EINVAL;
c66ac9db
NB		 934 break;
935 }
936
e3d6f909
AG		 937 if (p_buf) {
938 if (p_buf_len < strlen(buf)+1)
939 return -EINVAL;
c66ac9db 940 strncpy(p_buf, buf, p_buf_len);
e3d6f909 941 } else {
6708bb27 942 pr_debug("%s", buf);
e3d6f909 943 }
c66ac9db
NB		 944
945 return ret;
946}
947
948int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
949{
950 /*
951 * The VPD identifier type..
952 *
953 * from spc3r23.pdf Section 7.6.3.1 Table 298
954 */
955 vpd->device_identifier_type = (page_83[1] & 0x0f);
956 return transport_dump_vpd_ident_type(vpd, NULL, 0);
957}
958EXPORT_SYMBOL(transport_set_vpd_ident_type);
959
960int transport_dump_vpd_ident(
961 struct t10_vpd *vpd,
962 unsigned char *p_buf,
963 int p_buf_len)
964{
965 unsigned char buf[VPD_TMP_BUF_SIZE];
966 int ret = 0;
967
968 memset(buf, 0, VPD_TMP_BUF_SIZE);
969
970 switch (vpd->device_identifier_code_set) {
971 case 0x01: /* Binary */
703d641d
DC		 972 snprintf(buf, sizeof(buf),
973 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 974 &vpd->device_identifier[0]);
975 break;
976 case 0x02: /* ASCII */
703d641d
DC		 977 snprintf(buf, sizeof(buf),
978 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 979 &vpd->device_identifier[0]);
980 break;
981 case 0x03: /* UTF-8 */
703d641d
DC		 982 snprintf(buf, sizeof(buf),
983 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 984 &vpd->device_identifier[0]);
985 break;
986 default:
987 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
988 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 989 ret = -EINVAL;
c66ac9db
NB		 990 break;
991 }
992
993 if (p_buf)
994 strncpy(p_buf, buf, p_buf_len);
995 else
6708bb27 996 pr_debug("%s", buf);
c66ac9db
NB		 997
998 return ret;
999}
1000
1001int
1002transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1003{
1004 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1005 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1006
1007 /*
1008 * The VPD Code Set (encoding)
1009 *
1010 * from spc3r23.pdf Section 7.6.3.1 Table 296
1011 */
1012 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1013 switch (vpd->device_identifier_code_set) {
1014 case 0x01: /* Binary */
1015 vpd->device_identifier[j++] =
1016 hex_str[vpd->device_identifier_type];
1017 while (i < (4 + page_83[3])) {
1018 vpd->device_identifier[j++] =
1019 hex_str[(page_83[i] & 0xf0) >> 4];
1020 vpd->device_identifier[j++] =
1021 hex_str[page_83[i] & 0x0f];
1022 i++;
1023 }
1024 break;
1025 case 0x02: /* ASCII */
1026 case 0x03: /* UTF-8 */
1027 while (i < (4 + page_83[3]))
1028 vpd->device_identifier[j++] = page_83[i++];
1029 break;
1030 default:
1031 break;
1032 }
1033
1034 return transport_dump_vpd_ident(vpd, NULL, 0);
1035}
1036EXPORT_SYMBOL(transport_set_vpd_ident);
1037
de103c93
CH		 1038sense_reason_t
1039target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1040{
1041 struct se_device *dev = cmd->se_dev;
1042
1043 if (cmd->unknown_data_length) {
1044 cmd->data_length = size;
1045 } else if (size != cmd->data_length) {
1046 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1047 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1048 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1049 cmd->data_length, size, cmd->t_task_cdb[0]);
1050
9b3b8041
CH		 1051 if (cmd->data_direction == DMA_TO_DEVICE) {
1052 pr_err("Rejecting underflow/overflow"
1053 " WRITE data\n");
de103c93 1054 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1055 }
1056 /*
1057 * Reject READ_* or WRITE_* with overflow/underflow for
1058 * type SCF_SCSI_DATA_CDB.
1059 */
0fd97ccf 1060 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1061 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1062 " CDB on non 512-byte sector setup subsystem"
1063 " plugin: %s\n", dev->transport->name);
1064 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1065 return TCM_INVALID_CDB_FIELD;
9b3b8041 1066 }
4c054ba6
NB		 1067 /*
1068 * For the overflow case keep the existing fabric provided
1069 * ->data_length. Otherwise for the underflow case, reset
1070 * ->data_length to the smaller SCSI expected data transfer
1071 * length.
1072 */
9b3b8041
CH		 1073 if (size > cmd->data_length) {
1074 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1075 cmd->residual_count = (size - cmd->data_length);
1076 } else {
1077 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1078 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1079 cmd->data_length = size;
9b3b8041 1080 }
9b3b8041
CH		 1081 }
1082
1083 return 0;
1084
9b3b8041
CH		 1085}
1086
c66ac9db
NB		 1087/*
1088 * Used by fabric modules containing a local struct se_cmd within their
1089 * fabric dependent per I/O descriptor.
1090 */
1091void transport_init_se_cmd(
1092 struct se_cmd *cmd,
1093 struct target_core_fabric_ops *tfo,
1094 struct se_session *se_sess,
1095 u32 data_length,
1096 int data_direction,
1097 int task_attr,
1098 unsigned char *sense_buffer)
1099{
5951146d 1100 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1101 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1102 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1103 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1104 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1105 init_completion(&cmd->cmd_wait_comp);
cf572a96 1106 init_completion(&cmd->task_stop_comp);
a1d8b49a 1107 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1108 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1109
1110 cmd->se_tfo = tfo;
1111 cmd->se_sess = se_sess;
1112 cmd->data_length = data_length;
1113 cmd->data_direction = data_direction;
1114 cmd->sam_task_attr = task_attr;
1115 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1116
1117 cmd->state_active = false;
c66ac9db
NB		 1118}
1119EXPORT_SYMBOL(transport_init_se_cmd);
1120
de103c93
CH		 1121static sense_reason_t
1122transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1123{
019c4ca6
CH		 1124 struct se_device *dev = cmd->se_dev;
1125
c66ac9db
NB		 1126 /*
1127 * Check if SAM Task Attribute emulation is enabled for this
1128 * struct se_device storage object
1129 */
019c4ca6 1130 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1131 return 0;
1132
e66ecd50 1133 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1134 pr_debug("SAM Task Attribute ACA"
c66ac9db 1135 " emulation is not supported\n");
de103c93 1136 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1137 }
1138 /*
1139 * Used to determine when ORDERED commands should go from
1140 * Dormant to Active status.
1141 */
019c4ca6 1142 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1143 smp_mb__after_atomic_inc();
6708bb27 1144 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1145 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1146 dev->transport->name);
c66ac9db
NB		 1147 return 0;
1148}
1149
de103c93
CH		 1150sense_reason_t
1151target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1152{
0fd97ccf 1153 struct se_device *dev = cmd->se_dev;
de103c93 1154 sense_reason_t ret;
c66ac9db 1155
c66ac9db
NB		 1156 /*
1157 * Ensure that the received CDB is less than the max (252 + 8) bytes
1158 * for VARIABLE_LENGTH_CMD
1159 */
1160 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1161 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1162 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1163 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1164 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1165 }
1166 /*
1167 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1168 * allocate the additional extended CDB buffer now.. Otherwise
1169 * setup the pointer from __t_task_cdb to t_task_cdb.
1170 */
a1d8b49a
AG		 1171 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1172 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1173 GFP_KERNEL);
6708bb27
AG		 1174 if (!cmd->t_task_cdb) {
1175 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1176 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1177 scsi_command_size(cdb),
a1d8b49a 1178 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1179 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1180 }
1181 } else
a1d8b49a 1182 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1183 /*
a1d8b49a 1184 * Copy the original CDB into cmd->
c66ac9db 1185 */
a1d8b49a 1186 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1187
e5c0d6ad
RD		 1188 trace_target_sequencer_start(cmd);
1189
cb4f4d3c
CH		 1190 /*
1191 * Check for an existing UNIT ATTENTION condition
1192 */
de103c93
CH		 1193 ret = target_scsi3_ua_check(cmd);
1194 if (ret)
1195 return ret;
cb4f4d3c 1196
c87fbd56 1197 ret = target_alua_state_check(cmd);
de103c93
CH		 1198 if (ret)
1199 return ret;
cb4f4d3c 1200
d977f437 1201 ret = target_check_reservation(cmd);
f85eda8d
NB		 1202 if (ret) {
1203 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1204 return ret;
f85eda8d 1205 }
cb4f4d3c 1206
0fd97ccf 1207 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1208 if (ret)
1209 return ret;
1210
1211 ret = transport_check_alloc_task_attr(cmd);
1212 if (ret)
c66ac9db 1213 return ret;
cb4f4d3c 1214
cb4f4d3c 1215 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1216
c66ac9db
NB		 1217 spin_lock(&cmd->se_lun->lun_sep_lock);
1218 if (cmd->se_lun->lun_sep)
1219 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1220 spin_unlock(&cmd->se_lun->lun_sep_lock);
1221 return 0;
1222}
a12f41f8 1223EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1224
695434e1
NB		 1225/*
1226 * Used by fabric module frontends to queue tasks directly.
1227 * Many only be used from process context only
1228 */
1229int transport_handle_cdb_direct(
1230 struct se_cmd *cmd)
1231{
de103c93 1232 sense_reason_t ret;
dd8ae59d 1233
695434e1
NB		 1234 if (!cmd->se_lun) {
1235 dump_stack();
6708bb27 1236 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1237 return -EINVAL;
1238 }
1239 if (in_interrupt()) {
1240 dump_stack();
6708bb27 1241 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1242 " from interrupt context\n");
1243 return -EINVAL;
1244 }
dd8ae59d 1245 /*
af877292
CH		 1246 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1247 * outstanding descriptors are handled correctly during shutdown via
1248 * transport_wait_for_tasks()
dd8ae59d
NB		 1249 *
1250 * Also, we don't take cmd->t_state_lock here as we only expect
1251 * this to be called for initial descriptor submission.
1252 */
1253 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1254 cmd->transport_state |= CMD_T_ACTIVE;
1255
dd8ae59d
NB		 1256 /*
1257 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1258 * so follow TRANSPORT_NEW_CMD processing thread context usage
1259 * and call transport_generic_request_failure() if necessary..
1260 */
1261 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1262 if (ret)
1263 transport_generic_request_failure(cmd, ret);
dd8ae59d 1264 return 0;
695434e1
NB		 1265}
1266EXPORT_SYMBOL(transport_handle_cdb_direct);
1267
c5ff8d6b 1268sense_reason_t
de103c93
CH		 1269transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1270 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1271{
1272 if (!sgl || !sgl_count)
1273 return 0;
1274
1275 /*
1276 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1277 * scatterlists already have been set to follow what the fabric
1278 * passes for the original expected data transfer length.
1279 */
1280 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1281 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1282 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1283 return TCM_INVALID_CDB_FIELD;
1284 }
1285
1286 cmd->t_data_sg = sgl;
1287 cmd->t_data_nents = sgl_count;
1288
1289 if (sgl_bidi && sgl_bidi_count) {
1290 cmd->t_bidi_data_sg = sgl_bidi;
1291 cmd->t_bidi_data_nents = sgl_bidi_count;
1292 }
1293 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1294 return 0;
1295}
1296
a026757f
NB		 1297/*
1298 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1299 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1300 *
1301 * @se_cmd: command descriptor to submit
1302 * @se_sess: associated se_sess for endpoint
1303 * @cdb: pointer to SCSI CDB
1304 * @sense: pointer to SCSI sense buffer
1305 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1306 * @data_length: fabric expected data transfer length
1307 * @task_addr: SAM task attribute
1308 * @data_dir: DMA data direction
1309 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1310 * @sgl: struct scatterlist memory for unidirectional mapping
1311 * @sgl_count: scatterlist count for unidirectional mapping
1312 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1313 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1314 * @sgl_prot: struct scatterlist memory protection information
1315 * @sgl_prot_count: scatterlist count for protection information
a6360785 1316 *
d6dfc868
RD		 1317 * Returns non zero to signal active I/O shutdown failure. All other
1318 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1319 * but still return zero here.
1320 *
a6360785
NB		 1321 * This may only be called from process context, and also currently
1322 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1323 */
1324int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1325 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1326 u32 data_length, int task_attr, int data_dir, int flags,
1327 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1328 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1329 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1330{
1331 struct se_portal_group *se_tpg;
de103c93
CH		 1332 sense_reason_t rc;
1333 int ret;
a6360785
NB		 1334
1335 se_tpg = se_sess->se_tpg;
1336 BUG_ON(!se_tpg);
1337 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1338 BUG_ON(in_interrupt());
1339 /*
1340 * Initialize se_cmd for target operation. From this point
1341 * exceptions are handled by sending exception status via
1342 * target_core_fabric_ops->queue_status() callback
1343 */
1344 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1345 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1346 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1347 se_cmd->unknown_data_length = 1;
a6360785
NB		 1348 /*
1349 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1350 * se_sess->sess_cmd_list. A second kref_get here is necessary
1351 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1352 * kref_put() to happen during fabric packet acknowledgement.
1353 */
de103c93
CH		 1354 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1355 if (ret)
1356 return ret;
a6360785
NB		 1357 /*
1358 * Signal bidirectional data payloads to target-core
1359 */
1360 if (flags & TARGET_SCF_BIDI_OP)
1361 se_cmd->se_cmd_flags |= SCF_BIDI;
1362 /*
1363 * Locate se_lun pointer and attach it to struct se_cmd
1364 */
de103c93
CH		 1365 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1366 if (rc) {
1367 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1368 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1369 return 0;
735703ca 1370 }
def2b339
NB		 1371 /*
1372 * Save pointers for SGLs containing protection information,
1373 * if present.
1374 */
1375 if (sgl_prot_count) {
1376 se_cmd->t_prot_sg = sgl_prot;
1377 se_cmd->t_prot_nents = sgl_prot_count;
1378 }
d6e0175c 1379
a12f41f8 1380 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1381 if (rc != 0) {
de103c93 1382 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1383 return 0;
735703ca 1384 }
a026757f
NB		 1385 /*
1386 * When a non zero sgl_count has been passed perform SGL passthrough
1387 * mapping for pre-allocated fabric memory instead of having target
1388 * core perform an internal SGL allocation..
1389 */
1390 if (sgl_count != 0) {
1391 BUG_ON(!sgl);
1392
944981c7
NB		 1393 /*
1394 * A work-around for tcm_loop as some userspace code via
1395 * scsi-generic do not memset their associated read buffers,
1396 * so go ahead and do that here for type non-data CDBs. Also
1397 * note that this is currently guaranteed to be a single SGL
1398 * for this case by target core in target_setup_cmd_from_cdb()
1399 * -> transport_generic_cmd_sequencer().
1400 */
1401 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1402 se_cmd->data_direction == DMA_FROM_DEVICE) {
1403 unsigned char *buf = NULL;
1404
1405 if (sgl)
1406 buf = kmap(sg_page(sgl)) + sgl->offset;
1407
1408 if (buf) {
1409 memset(buf, 0, sgl->length);
1410 kunmap(sg_page(sgl));
1411 }
1412 }
1413
a026757f
NB		 1414 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1415 sgl_bidi, sgl_bidi_count);
1416 if (rc != 0) {
de103c93 1417 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1418 return 0;
1419 }
1420 }
def2b339 1421
11e319ed
AG		 1422 /*
1423 * Check if we need to delay processing because of ALUA
1424 * Active/NonOptimized primary access state..
1425 */
1426 core_alua_check_nonop_delay(se_cmd);
1427
a6360785 1428 transport_handle_cdb_direct(se_cmd);
d6dfc868 1429 return 0;
a6360785 1430}
a026757f
NB		 1431EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1432
1433/*
1434 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1435 *
1436 * @se_cmd: command descriptor to submit
1437 * @se_sess: associated se_sess for endpoint
1438 * @cdb: pointer to SCSI CDB
1439 * @sense: pointer to SCSI sense buffer
1440 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1441 * @data_length: fabric expected data transfer length
1442 * @task_addr: SAM task attribute
1443 * @data_dir: DMA data direction
1444 * @flags: flags for command submission from target_sc_flags_tables
1445 *
1446 * Returns non zero to signal active I/O shutdown failure. All other
1447 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1448 * but still return zero here.
1449 *
1450 * This may only be called from process context, and also currently
1451 * assumes internal allocation of fabric payload buffer by target-core.
1452 *
1453 * It also assumes interal target core SGL memory allocation.
1454 */
1455int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1456 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1457 u32 data_length, int task_attr, int data_dir, int flags)
1458{
1459 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1460 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1461 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1462}
a6360785
NB		 1463EXPORT_SYMBOL(target_submit_cmd);
1464
9f0d05c2
NB		 1465static void target_complete_tmr_failure(struct work_struct *work)
1466{
1467 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1468
1469 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1470 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1471
1472 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1473}
1474
ea98d7f9
AG		 1475/**
1476 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1477 * for TMR CDBs
1478 *
1479 * @se_cmd: command descriptor to submit
1480 * @se_sess: associated se_sess for endpoint
1481 * @sense: pointer to SCSI sense buffer
1482 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1483 * @fabric_context: fabric context for TMR req
1484 * @tm_type: Type of TM request
c0974f89
NB		 1485 * @gfp: gfp type for caller
1486 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1487 * @flags: submit cmd flags
ea98d7f9
AG		 1488 *
1489 * Callable from all contexts.
1490 **/
1491
c7042cae 1492int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1493 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1494 void *fabric_tmr_ptr, unsigned char tm_type,
1495 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1496{
1497 struct se_portal_group *se_tpg;
1498 int ret;
1499
1500 se_tpg = se_sess->se_tpg;
1501 BUG_ON(!se_tpg);
1502
1503 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1504 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1505 /*
1506 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1507 * allocation failure.
1508 */
c0974f89 1509 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1510 if (ret < 0)
1511 return -ENOMEM;
ea98d7f9 1512
c0974f89
NB		 1513 if (tm_type == TMR_ABORT_TASK)
1514 se_cmd->se_tmr_req->ref_task_tag = tag;
1515
ea98d7f9 1516 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1517 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1518 if (ret) {
1519 core_tmr_release_req(se_cmd->se_tmr_req);
1520 return ret;
1521 }
ea98d7f9 1522
ea98d7f9
AG		 1523 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1524 if (ret) {
9f0d05c2
NB		 1525 /*
1526 * For callback during failure handling, push this work off
1527 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1528 */
1529 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1530 schedule_work(&se_cmd->work);
c7042cae 1531 return 0;
ea98d7f9
AG		 1532 }
1533 transport_generic_handle_tmr(se_cmd);
c7042cae 1534 return 0;
ea98d7f9
AG		 1535}
1536EXPORT_SYMBOL(target_submit_tmr);
1537
cdbb70bb 1538/*
cf572a96 1539 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1540 * has completed.
1541 */
cf572a96 1542bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1543{
cdbb70bb
CH		 1544 bool was_active = false;
1545
cf572a96
CH		 1546 if (cmd->transport_state & CMD_T_BUSY) {
1547 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1548 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1549
cf572a96
CH		 1550 pr_debug("cmd %p waiting to complete\n", cmd);
1551 wait_for_completion(&cmd->task_stop_comp);
1552 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1553
1554 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1555 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1556 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1557 was_active = true;
1558 }
1559
cdbb70bb
CH		 1560 return was_active;
1561}
1562
c66ac9db
NB		 1563/*
1564 * Handle SAM-esque emulation for generic transport request failures.
1565 */
de103c93
CH		 1566void transport_generic_request_failure(struct se_cmd *cmd,
1567 sense_reason_t sense_reason)
c66ac9db 1568{
07bde79a
NB		 1569 int ret = 0;
1570
6708bb27 1571 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1572 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1573 cmd->t_task_cdb[0]);
de103c93 1574 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1575 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1576 cmd->t_state, sense_reason);
d43d6aea 1577 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1578 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1579 (cmd->transport_state & CMD_T_STOP) != 0,
1580 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1581
c66ac9db
NB		 1582 /*
1583 * For SAM Task Attribute emulation for failed struct se_cmd
1584 */
019c4ca6 1585 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1586 /*
1587 * Handle special case for COMPARE_AND_WRITE failure, where the
1588 * callback is expected to drop the per device ->caw_mutex.
1589 */
1590 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1591 cmd->transport_complete_callback)
1592 cmd->transport_complete_callback(cmd);
c66ac9db 1593
de103c93 1594 switch (sense_reason) {
03e98c9e
NB		 1595 case TCM_NON_EXISTENT_LUN:
1596 case TCM_UNSUPPORTED_SCSI_OPCODE:
1597 case TCM_INVALID_CDB_FIELD:
1598 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1599 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1600 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1601 case TCM_UNKNOWN_MODE_PAGE:
1602 case TCM_WRITE_PROTECTED:
e2397c70 1603 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1604 case TCM_CHECK_CONDITION_ABORT_CMD:
1605 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1606 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1607 break;
de103c93
CH		 1608 case TCM_OUT_OF_RESOURCES:
1609 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1610 break;
03e98c9e 1611 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1612 /*
1613 * No SENSE Data payload for this case, set SCSI Status
1614 * and queue the response to $FABRIC_MOD.
1615 *
1616 * Uses linux/include/scsi/scsi.h SAM status codes defs
1617 */
1618 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1619 /*
1620 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1621 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1622 * CONFLICT STATUS.
1623 *
1624 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1625 */
e3d6f909 1626 if (cmd->se_sess &&
0fd97ccf 1627 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1628 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1629 cmd->orig_fe_lun, 0x2C,
1630 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1631
e5c0d6ad
RD		 1632 trace_target_cmd_complete(cmd);
1633 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1634 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1635 goto queue_full;
c66ac9db 1636 goto check_stop;
c66ac9db 1637 default:
6708bb27 1638 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1639 cmd->t_task_cdb[0], sense_reason);
1640 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1641 break;
1642 }
f3146437 1643
de103c93 1644 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1645 if (ret == -EAGAIN || ret == -ENOMEM)
1646 goto queue_full;
07bde79a 1647
c66ac9db
NB		 1648check_stop:
1649 transport_lun_remove_cmd(cmd);
6708bb27 1650 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1651 ;
07bde79a
NB		 1652 return;
1653
1654queue_full:
e057f533
CH		 1655 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1656 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1657}
2fbff127 1658EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1659
76dde50e 1660void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1661{
de103c93 1662 sense_reason_t ret;
5f41a31d 1663
de103c93
CH		 1664 if (cmd->execute_cmd) {
1665 ret = cmd->execute_cmd(cmd);
1666 if (ret) {
1667 spin_lock_irq(&cmd->t_state_lock);
1668 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1669 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1670
de103c93
CH		 1671 transport_generic_request_failure(cmd, ret);
1672 }
5f41a31d
CH		 1673 }
1674}
1675
019c4ca6 1676static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1677{
1678 struct se_device *dev = cmd->se_dev;
1679
019c4ca6
CH		 1680 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1681 return false;
5f41a31d 1682
c66ac9db 1683 /*
25985edc 1684 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1685 * to allow the passed struct se_cmd list of tasks to the front of the list.
1686 */
5f41a31d
CH		 1687 switch (cmd->sam_task_attr) {
1688 case MSG_HEAD_TAG:
1689 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1690 "se_ordered_id: %u\n",
1691 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1692 return false;
5f41a31d
CH		 1693 case MSG_ORDERED_TAG:
1694 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1695 smp_mb__after_atomic_inc();
1696
5f41a31d
CH		 1697 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1698 " se_ordered_id: %u\n",
1699 cmd->t_task_cdb[0], cmd->se_ordered_id);
1700
c66ac9db 1701 /*
5f41a31d
CH		 1702 * Execute an ORDERED command if no other older commands
1703 * exist that need to be completed first.
c66ac9db 1704 */
5f41a31d 1705 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1706 return false;
5f41a31d
CH		 1707 break;
1708 default:
c66ac9db
NB		 1709 /*
1710 * For SIMPLE and UNTAGGED Task Attribute commands
1711 */
5f41a31d 1712 atomic_inc(&dev->simple_cmds);
c66ac9db 1713 smp_mb__after_atomic_inc();
5f41a31d 1714 break;
c66ac9db 1715 }
5f41a31d 1716
019c4ca6
CH		 1717 if (atomic_read(&dev->dev_ordered_sync) == 0)
1718 return false;
c66ac9db 1719
019c4ca6
CH		 1720 spin_lock(&dev->delayed_cmd_lock);
1721 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1722 spin_unlock(&dev->delayed_cmd_lock);
1723
1724 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1725 " delayed CMD list, se_ordered_id: %u\n",
1726 cmd->t_task_cdb[0], cmd->sam_task_attr,
1727 cmd->se_ordered_id);
1728 return true;
1729}
1730
1731void target_execute_cmd(struct se_cmd *cmd)
1732{
1733 /*
1734 * If the received CDB has aleady been aborted stop processing it here.
1735 */
4a9a6c8d 1736 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1737 return;
c66ac9db 1738
019c4ca6
CH		 1739 /*
1740 * Determine if frontend context caller is requesting the stopping of
1741 * this command for frontend exceptions.
1742 */
4a9a6c8d 1743 spin_lock_irq(&cmd->t_state_lock);
019c4ca6
CH		 1744 if (cmd->transport_state & CMD_T_STOP) {
1745 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1746 __func__, __LINE__,
1747 cmd->se_tfo->get_task_tag(cmd));
1748
1749 spin_unlock_irq(&cmd->t_state_lock);
1750 complete(&cmd->t_transport_stop_comp);
1751 return;
1752 }
1753
1754 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1755 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6
CH		 1756 spin_unlock_irq(&cmd->t_state_lock);
1757
1a398b97
NB		 1758 if (target_handle_task_attr(cmd)) {
1759 spin_lock_irq(&cmd->t_state_lock);
1760 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1761 spin_unlock_irq(&cmd->t_state_lock);
1762 return;
1763 }
1764
1765 __target_execute_cmd(cmd);
c66ac9db 1766}
70baf0ab 1767EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1768
5f41a31d
CH		 1769/*
1770 * Process all commands up to the last received ORDERED task attribute which
1771 * requires another blocking boundary
1772 */
1773static void target_restart_delayed_cmds(struct se_device *dev)
1774{
1775 for (;;) {
1776 struct se_cmd *cmd;
1777
1778 spin_lock(&dev->delayed_cmd_lock);
1779 if (list_empty(&dev->delayed_cmd_list)) {
1780 spin_unlock(&dev->delayed_cmd_lock);
1781 break;
1782 }
1783
1784 cmd = list_entry(dev->delayed_cmd_list.next,
1785 struct se_cmd, se_delayed_node);
1786 list_del(&cmd->se_delayed_node);
1787 spin_unlock(&dev->delayed_cmd_lock);
1788
1789 __target_execute_cmd(cmd);
1790
1791 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1792 break;
1793 }
1794}
1795
c66ac9db 1796/*
35e0e757 1797 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1798 * and ordered cmds need to have their tasks added to the execution queue.
1799 */
1800static void transport_complete_task_attr(struct se_cmd *cmd)
1801{
5951146d 1802 struct se_device *dev = cmd->se_dev;
c66ac9db 1803
019c4ca6
CH		 1804 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1805 return;
1806
e66ecd50 1807 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1808 atomic_dec(&dev->simple_cmds);
1809 smp_mb__after_atomic_dec();
1810 dev->dev_cur_ordered_id++;
6708bb27 1811 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1812 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1813 cmd->se_ordered_id);
e66ecd50 1814 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1815 dev->dev_cur_ordered_id++;
6708bb27 1816 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1817 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1818 cmd->se_ordered_id);
e66ecd50 1819 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1820 atomic_dec(&dev->dev_ordered_sync);
1821 smp_mb__after_atomic_dec();
c66ac9db
NB		 1822
1823 dev->dev_cur_ordered_id++;
6708bb27 1824 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1825 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1826 }
c66ac9db 1827
5f41a31d 1828 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1829}
1830
e057f533 1831static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1832{
1833 int ret = 0;
1834
019c4ca6 1835 transport_complete_task_attr(cmd);
e057f533
CH		 1836
1837 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1838 trace_target_cmd_complete(cmd);
e057f533
CH		 1839 ret = cmd->se_tfo->queue_status(cmd);
1840 if (ret)
1841 goto out;
1842 }
07bde79a
NB		 1843
1844 switch (cmd->data_direction) {
1845 case DMA_FROM_DEVICE:
e5c0d6ad 1846 trace_target_cmd_complete(cmd);
07bde79a
NB		 1847 ret = cmd->se_tfo->queue_data_in(cmd);
1848 break;
1849 case DMA_TO_DEVICE:
64577407 1850 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a
NB		 1851 ret = cmd->se_tfo->queue_data_in(cmd);
1852 if (ret < 0)
e057f533 1853 break;
07bde79a
NB		 1854 }
1855 /* Fall through for DMA_TO_DEVICE */
1856 case DMA_NONE:
e5c0d6ad 1857 trace_target_cmd_complete(cmd);
07bde79a
NB		 1858 ret = cmd->se_tfo->queue_status(cmd);
1859 break;
1860 default:
1861 break;
1862 }
1863
e057f533
CH		 1864out:
1865 if (ret < 0) {
1866 transport_handle_queue_full(cmd, cmd->se_dev);
1867 return;
1868 }
1869 transport_lun_remove_cmd(cmd);
1870 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1871}
1872
1873static void transport_handle_queue_full(
1874 struct se_cmd *cmd,
e057f533 1875 struct se_device *dev)
07bde79a
NB		 1876{
1877 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1878 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1879 atomic_inc(&dev->dev_qf_count);
1880 smp_mb__after_atomic_inc();
1881 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1882
1883 schedule_work(&cmd->se_dev->qf_work_queue);
1884}
1885
35e0e757 1886static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1887{
35e0e757 1888 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1889 int ret;
35e0e757 1890
c66ac9db
NB		 1891 /*
1892 * Check if we need to move delayed/dormant tasks from cmds on the
1893 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1894 * Attribute.
1895 */
019c4ca6
CH		 1896 transport_complete_task_attr(cmd);
1897
07bde79a
NB		 1898 /*
1899 * Check to schedule QUEUE_FULL work, or execute an existing
1900 * cmd->transport_qf_callback()
1901 */
1902 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1903 schedule_work(&cmd->se_dev->qf_work_queue);
1904
c66ac9db 1905 /*
d5829eac 1906 * Check if we need to send a sense buffer from
c66ac9db
NB		 1907 * the struct se_cmd in question.
1908 */
1909 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1910 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1911 ret = transport_send_check_condition_and_sense(
1912 cmd, 0, 1);
1913 if (ret == -EAGAIN || ret == -ENOMEM)
1914 goto queue_full;
1915
1916 transport_lun_remove_cmd(cmd);
1917 transport_cmd_check_stop_to_fabric(cmd);
1918 return;
c66ac9db
NB		 1919 }
1920 /*
25985edc 1921 * Check for a callback, used by amongst other things
a6b0133c 1922 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 1923 */
a6b0133c
NB		 1924 if (cmd->transport_complete_callback) {
1925 sense_reason_t rc;
1926
1927 rc = cmd->transport_complete_callback(cmd);
a2890087 1928 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
a6b0133c 1929 return;
a2890087
NB		 1930 } else if (rc) {
1931 ret = transport_send_check_condition_and_sense(cmd,
1932 rc, 0);
1933 if (ret == -EAGAIN || ret == -ENOMEM)
1934 goto queue_full;
a6b0133c 1935
a2890087
NB		 1936 transport_lun_remove_cmd(cmd);
1937 transport_cmd_check_stop_to_fabric(cmd);
1938 return;
1939 }
a6b0133c 1940 }
c66ac9db
NB		 1941
1942 switch (cmd->data_direction) {
1943 case DMA_FROM_DEVICE:
1944 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1945 if (cmd->se_lun->lun_sep) {
1946 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1947 cmd->data_length;
1948 }
1949 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1950
e5c0d6ad 1951 trace_target_cmd_complete(cmd);
07bde79a 1952 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1953 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1954 goto queue_full;
c66ac9db
NB		 1955 break;
1956 case DMA_TO_DEVICE:
1957 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1958 if (cmd->se_lun->lun_sep) {
1959 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1960 cmd->data_length;
1961 }
1962 spin_unlock(&cmd->se_lun->lun_sep_lock);
1963 /*
1964 * Check if we need to send READ payload for BIDI-COMMAND
1965 */
64577407 1966 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 1967 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1968 if (cmd->se_lun->lun_sep) {
1969 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1970 cmd->data_length;
1971 }
1972 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1973 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1974 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1975 goto queue_full;
c66ac9db
NB		 1976 break;
1977 }
1978 /* Fall through for DMA_TO_DEVICE */
1979 case DMA_NONE:
e5c0d6ad 1980 trace_target_cmd_complete(cmd);
07bde79a 1981 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1982 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1983 goto queue_full;
c66ac9db
NB		 1984 break;
1985 default:
1986 break;
1987 }
1988
1989 transport_lun_remove_cmd(cmd);
1990 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1991 return;
1992
1993queue_full:
6708bb27 1994 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1995 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1996 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1997 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1998}
1999
6708bb27 2000static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2001{
ec98f782 2002 struct scatterlist *sg;
ec98f782 2003 int count;
c66ac9db 2004
6708bb27
AG		 2005 for_each_sg(sgl, sg, nents, count)
2006 __free_page(sg_page(sg));
c66ac9db 2007
6708bb27
AG		 2008 kfree(sgl);
2009}
c66ac9db 2010
47e459e6
NB		 2011static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2012{
2013 /*
2014 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2015 * emulation, and free + reset pointers if necessary..
2016 */
2017 if (!cmd->t_data_sg_orig)
2018 return;
2019
2020 kfree(cmd->t_data_sg);
2021 cmd->t_data_sg = cmd->t_data_sg_orig;
2022 cmd->t_data_sg_orig = NULL;
2023 cmd->t_data_nents = cmd->t_data_nents_orig;
2024 cmd->t_data_nents_orig = 0;
2025}
2026
6708bb27
AG		 2027static inline void transport_free_pages(struct se_cmd *cmd)
2028{
47e459e6
NB		 2029 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2030 transport_reset_sgl_orig(cmd);
6708bb27 2031 return;
47e459e6
NB		 2032 }
2033 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2034
2035 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2036 cmd->t_data_sg = NULL;
2037 cmd->t_data_nents = 0;
c66ac9db 2038
6708bb27 2039 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2040 cmd->t_bidi_data_sg = NULL;
2041 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2042}
2043
e26d99ae
CH		 2044/**
2045 * transport_release_cmd - free a command
2046 * @cmd: command to free
2047 *
2048 * This routine unconditionally frees a command, and reference counting
2049 * or list removal must be done in the caller.
2050 */
d5ddad41 2051static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2052{
2053 BUG_ON(!cmd->se_tfo);
2054
c8e31f26 2055 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2056 core_tmr_release_req(cmd->se_tmr_req);
2057 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2058 kfree(cmd->t_task_cdb);
2059 /*
7481deb4
NB		 2060 * If this cmd has been setup with target_get_sess_cmd(), drop
2061 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2062 */
ca24976a 2063 return target_put_sess_cmd(cmd->se_sess, cmd);
e26d99ae
CH		 2064}
2065
d3df7825
CH		 2066/**
2067 * transport_put_cmd - release a reference to a command
2068 * @cmd: command to release
2069 *
2070 * This routine releases our reference to the command and frees it if possible.
2071 */
d5ddad41 2072static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2073{
c66ac9db 2074 transport_free_pages(cmd);
d5ddad41 2075 return transport_release_cmd(cmd);
c66ac9db 2076}
c66ac9db 2077
4949314c 2078void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2079{
ec98f782 2080 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2081 struct page **pages;
2082 int i;
05d1c7c0
AG		 2083
2084 /*
ec98f782
AG		 2085 * We need to take into account a possible offset here for fabrics like
2086 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2087 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2088 */
4949314c
AG		 2089 if (!cmd->t_data_nents)
2090 return NULL;
3717ef0c
PB		 2091
2092 BUG_ON(!sg);
2093 if (cmd->t_data_nents == 1)
4949314c
AG		 2094 return kmap(sg_page(sg)) + sg->offset;
2095
2096 /* >1 page. use vmap */
2097 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2098 if (!pages)
4949314c
AG		 2099 return NULL;
2100
2101 /* convert sg[] to pages[] */
2102 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2103 pages[i] = sg_page(sg);
2104 }
2105
2106 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2107 kfree(pages);
de103c93 2108 if (!cmd->t_data_vmap)
4949314c
AG		 2109 return NULL;
2110
2111 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2112}
4949314c 2113EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2114
4949314c 2115void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2116{
a1edf9cf 2117 if (!cmd->t_data_nents) {
4949314c 2118 return;
a1edf9cf 2119 } else if (cmd->t_data_nents == 1) {
4949314c 2120 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2121 return;
2122 }
4949314c
AG		 2123
2124 vunmap(cmd->t_data_vmap);
2125 cmd->t_data_vmap = NULL;
05d1c7c0 2126}
4949314c 2127EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2128
c5ff8d6b 2129int
20093994
NB		 2130target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2131 bool zero_page)
c66ac9db 2132{
20093994 2133 struct scatterlist *sg;
ec98f782 2134 struct page *page;
20093994
NB		 2135 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2136 unsigned int nent;
ec98f782 2137 int i = 0;
c66ac9db 2138
20093994
NB		 2139 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2140 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2141 if (!sg)
ec98f782 2142 return -ENOMEM;
c66ac9db 2143
20093994 2144 sg_init_table(sg, nent);
9db9da33 2145
ec98f782
AG		 2146 while (length) {
2147 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2148 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2149 if (!page)
2150 goto out;
c66ac9db 2151
20093994 2152 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2153 length -= page_len;
2154 i++;
c66ac9db 2155 }
20093994
NB		 2156 *sgl = sg;
2157 *nents = nent;
c66ac9db 2158 return 0;
c66ac9db 2159
ec98f782 2160out:
d0e27c88 2161 while (i > 0) {
ec98f782 2162 i--;
20093994 2163 __free_page(sg_page(&sg[i]));
c66ac9db 2164 }
20093994 2165 kfree(sg);
ec98f782 2166 return -ENOMEM;
c66ac9db
NB		 2167}
2168
da0f7619 2169/*
b16a35b0
AG		 2170 * Allocate any required resources to execute the command. For writes we
2171 * might not have the payload yet, so notify the fabric via a call to
2172 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2173 */
de103c93
CH		 2174sense_reason_t
2175transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2176{
c66ac9db
NB		 2177 int ret = 0;
2178
2179 /*
2180 * Determine is the TCM fabric module has already allocated physical
2181 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2182 * beforehand.
c66ac9db 2183 */
ec98f782
AG		 2184 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2185 cmd->data_length) {
20093994
NB		 2186 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2187
8cefe07b
NB		 2188 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2189 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2190 u32 bidi_length;
2191
2192 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2193 bidi_length = cmd->t_task_nolb *
2194 cmd->se_dev->dev_attrib.block_size;
2195 else
2196 bidi_length = cmd->data_length;
2197
2198 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2199 &cmd->t_bidi_data_nents,
2200 bidi_length, zero_flag);
2201 if (ret < 0)
2202 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2203 }
2204
20093994
NB		 2205 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2206 cmd->data_length, zero_flag);
c66ac9db 2207 if (ret < 0)
de103c93 2208 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2209 }
c66ac9db 2210 /*
c3196f0c
CH		 2211 * If this command is not a write we can execute it right here,
2212 * for write buffers we need to notify the fabric driver first
2213 * and let it call back once the write buffers are ready.
c66ac9db 2214 */
5f41a31d 2215 target_add_to_state_list(cmd);
c3196f0c
CH		 2216 if (cmd->data_direction != DMA_TO_DEVICE) {
2217 target_execute_cmd(cmd);
2218 return 0;
2219 }
862e6389 2220 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2221
2222 ret = cmd->se_tfo->write_pending(cmd);
2223 if (ret == -EAGAIN || ret == -ENOMEM)
2224 goto queue_full;
2225
de103c93
CH		 2226 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2227 WARN_ON(ret);
2228
b69c1fcf 2229 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2230
c3196f0c
CH		 2231queue_full:
2232 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2233 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2234 transport_handle_queue_full(cmd, cmd->se_dev);
2235 return 0;
c66ac9db 2236}
a1d8b49a 2237EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2238
e057f533 2239static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2240{
f147abb4
NB		 2241 int ret;
2242
2243 ret = cmd->se_tfo->write_pending(cmd);
2244 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2245 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2246 cmd);
2247 transport_handle_queue_full(cmd, cmd->se_dev);
2248 }
07bde79a
NB		 2249}
2250
d5ddad41 2251int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2252{
c130480b 2253 unsigned long flags;
d5ddad41
NB		 2254 int ret = 0;
2255
d14921d6 2256 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2257 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2258 transport_wait_for_tasks(cmd);
2259
d5ddad41 2260 ret = transport_release_cmd(cmd);
d14921d6
NB		 2261 } else {
2262 if (wait_for_tasks)
2263 transport_wait_for_tasks(cmd);
c130480b
NB		 2264 /*
2265 * Handle WRITE failure case where transport_generic_new_cmd()
2266 * has already added se_cmd to state_list, but fabric has
2267 * failed command before I/O submission.
2268 */
2269 if (cmd->state_active) {
2270 spin_lock_irqsave(&cmd->t_state_lock, flags);
2271 target_remove_from_state_list(cmd);
2272 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2273 }
d14921d6 2274
82f1c8a4 2275 if (cmd->se_lun)
c66ac9db 2276 transport_lun_remove_cmd(cmd);
c66ac9db 2277
d5ddad41 2278 ret = transport_put_cmd(cmd);
c66ac9db 2279 }
d5ddad41 2280 return ret;
c66ac9db
NB		 2281}
2282EXPORT_SYMBOL(transport_generic_free_cmd);
2283
a17f091d
NB		 2284/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2285 * @se_sess: session to reference
2286 * @se_cmd: command descriptor to add
a6360785 2287 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2288 */
20361e69 2289int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2290 bool ack_kref)
a17f091d
NB		 2291{
2292 unsigned long flags;
bc187ea6 2293 int ret = 0;
a17f091d 2294
7481deb4 2295 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2296 /*
2297 * Add a second kref if the fabric caller is expecting to handle
2298 * fabric acknowledgement that requires two target_put_sess_cmd()
2299 * invocations before se_cmd descriptor release.
2300 */
86715569 2301 if (ack_kref == true) {
a6360785 2302 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2303 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2304 }
7481deb4 2305
a17f091d 2306 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2307 if (se_sess->sess_tearing_down) {
2308 ret = -ESHUTDOWN;
2309 goto out;
2310 }
a17f091d 2311 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2312out:
a17f091d 2313 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2314 return ret;
a17f091d 2315}
20361e69 2316EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2317
7481deb4 2318static void target_release_cmd_kref(struct kref *kref)
a17f091d 2319{
7481deb4
NB		 2320 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2321 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2322
a17f091d 2323 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2324 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2325 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2326 return;
a17f091d 2327 }
a17f091d 2328 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2329 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2330 complete(&se_cmd->cmd_wait_comp);
7481deb4 2331 return;
a17f091d
NB		 2332 }
2333 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2334 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2335
7481deb4
NB		 2336 se_cmd->se_tfo->release_cmd(se_cmd);
2337}
2338
2339/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2340 * @se_sess: session to reference
2341 * @se_cmd: command descriptor to drop
2342 */
2343int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2344{
ccf5ae83
JE		 2345 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2346 &se_sess->sess_cmd_lock);
a17f091d
NB		 2347}
2348EXPORT_SYMBOL(target_put_sess_cmd);
2349
1c7b13fe
RD		 2350/* target_sess_cmd_list_set_waiting - Flag all commands in
2351 * sess_cmd_list to complete cmd_wait_comp. Set
2352 * sess_tearing_down so no more commands are queued.
2353 * @se_sess: session to flag
a17f091d 2354 */
1c7b13fe 2355void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2356{
2357 struct se_cmd *se_cmd;
2358 unsigned long flags;
2359
a17f091d 2360 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2361 if (se_sess->sess_tearing_down) {
2362 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2363 return;
2364 }
1c7b13fe 2365 se_sess->sess_tearing_down = 1;
9b31a328 2366 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2367
9b31a328 2368 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2369 se_cmd->cmd_wait_set = 1;
2370
2371 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2372}
1c7b13fe 2373EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2374
2375/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2376 * @se_sess: session to wait for active I/O
a17f091d 2377 */
be646c2d 2378void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2379{
2380 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2381 unsigned long flags;
a17f091d
NB		 2382
2383 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2384 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2385 list_del(&se_cmd->se_cmd_list);
2386
2387 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2388 " %d\n", se_cmd, se_cmd->t_state,
2389 se_cmd->se_tfo->get_cmd_state(se_cmd));
2390
be646c2d
JE		 2391 wait_for_completion(&se_cmd->cmd_wait_comp);
2392 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2393 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2394 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2395
2396 se_cmd->se_tfo->release_cmd(se_cmd);
2397 }
9b31a328
NB		 2398
2399 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2400 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2401 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2402
a17f091d
NB		 2403}
2404EXPORT_SYMBOL(target_wait_for_sess_cmds);
2405
5277797d 2406static int transport_clear_lun_ref_thread(void *p)
c66ac9db 2407{
8359cf43 2408 struct se_lun *lun = p;
c66ac9db 2409
5277797d
NB		 2410 percpu_ref_kill(&lun->lun_ref);
2411
2412 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2413 complete(&lun->lun_shutdown_comp);
2414
2415 return 0;
2416}
2417
5277797d 2418int transport_clear_lun_ref(struct se_lun *lun)
c66ac9db
NB		 2419{
2420 struct task_struct *kt;
2421
5277797d 2422 kt = kthread_run(transport_clear_lun_ref_thread, lun,
c66ac9db
NB		 2423 "tcm_cl_%u", lun->unpacked_lun);
2424 if (IS_ERR(kt)) {
6708bb27 2425 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2426 return PTR_ERR(kt);
c66ac9db
NB		 2427 }
2428 wait_for_completion(&lun->lun_shutdown_comp);
2429
2430 return 0;
2431}
2432
d14921d6
NB		 2433/**
2434 * transport_wait_for_tasks - wait for completion to occur
2435 * @cmd: command to wait
c66ac9db 2436 *
d14921d6
NB		 2437 * Called from frontend fabric context to wait for storage engine
2438 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2439 */
a17f091d 2440bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2441{
2442 unsigned long flags;
2443
a1d8b49a 2444 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2445 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2446 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2447 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2448 return false;
d14921d6 2449 }
cb4f4d3c 2450
c8e31f26
AG		 2451 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2452 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2453 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2454 return false;
d14921d6 2455 }
7d680f3b 2456
3d28934a 2457 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2458 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2459 return false;
d14921d6 2460 }
c66ac9db 2461
7d680f3b 2462 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2463
6708bb27 2464 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2465 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2466 cmd, cmd->se_tfo->get_task_tag(cmd),
2467 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2468
a1d8b49a 2469 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2470
a1d8b49a 2471 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2472
a1d8b49a 2473 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2474 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2475
35d1efe8 2476 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2477 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2478 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2479
d14921d6 2480 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2481
2482 return true;
c66ac9db 2483}
d14921d6 2484EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2485
2486static int transport_get_sense_codes(
2487 struct se_cmd *cmd,
2488 u8 *asc,
2489 u8 *ascq)
2490{
2491 *asc = cmd->scsi_asc;
2492 *ascq = cmd->scsi_ascq;
2493
2494 return 0;
2495}
2496
76736db3
SG		 2497static
2498void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2499{
2500 /* Place failed LBA in sense data information descriptor 0. */
2501 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2502 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2503 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2504 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2505
2506 /* Descriptor Information: failing sector */
2507 put_unaligned_be64(bad_sector, &buffer[12]);
2508}
2509
de103c93
CH		 2510int
2511transport_send_check_condition_and_sense(struct se_cmd *cmd,
2512 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2513{
2514 unsigned char *buffer = cmd->sense_buffer;
2515 unsigned long flags;
c66ac9db
NB		 2516 u8 asc = 0, ascq = 0;
2517
a1d8b49a 2518 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2519 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2520 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2521 return 0;
2522 }
2523 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2524 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2525
2526 if (!reason && from_transport)
2527 goto after_reason;
2528
2529 if (!from_transport)
2530 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2531
c66ac9db
NB		 2532 /*
2533 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2534 * SENSE KEY values from include/scsi/scsi.h
2535 */
2536 switch (reason) {
ba829137
HR		 2537 case TCM_NO_SENSE:
2538 /* CURRENT ERROR */
2539 buffer[0] = 0x70;
2540 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2541 /* Not Ready */
2542 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2543 /* NO ADDITIONAL SENSE INFORMATION */
2544 buffer[SPC_ASC_KEY_OFFSET] = 0;
2545 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2546 break;
c66ac9db 2547 case TCM_NON_EXISTENT_LUN:
eb39d340 2548 /* CURRENT ERROR */
9c58b7dd
RD		 2549 buffer[0] = 0x70;
2550 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2551 /* ILLEGAL REQUEST */
9c58b7dd 2552 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2553 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2554 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2555 break;
c66ac9db
NB		 2556 case TCM_UNSUPPORTED_SCSI_OPCODE:
2557 case TCM_SECTOR_COUNT_TOO_MANY:
2558 /* CURRENT ERROR */
9c58b7dd
RD		 2559 buffer[0] = 0x70;
2560 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2561 /* ILLEGAL REQUEST */
9c58b7dd 2562 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2563 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2564 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2565 break;
2566 case TCM_UNKNOWN_MODE_PAGE:
2567 /* CURRENT ERROR */
9c58b7dd
RD		 2568 buffer[0] = 0x70;
2569 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2570 /* ILLEGAL REQUEST */
9c58b7dd 2571 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2572 /* INVALID FIELD IN CDB */
9c58b7dd 2573 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2574 break;
2575 case TCM_CHECK_CONDITION_ABORT_CMD:
2576 /* CURRENT ERROR */
9c58b7dd
RD		 2577 buffer[0] = 0x70;
2578 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2579 /* ABORTED COMMAND */
9c58b7dd 2580 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2581 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2582 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2583 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2584 break;
2585 case TCM_INCORRECT_AMOUNT_OF_DATA:
2586 /* CURRENT ERROR */
9c58b7dd
RD		 2587 buffer[0] = 0x70;
2588 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2589 /* ABORTED COMMAND */
9c58b7dd 2590 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2591 /* WRITE ERROR */
9c58b7dd 2592 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2593 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2594 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2595 break;
2596 case TCM_INVALID_CDB_FIELD:
2597 /* CURRENT ERROR */
9c58b7dd
RD		 2598 buffer[0] = 0x70;
2599 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2600 /* ILLEGAL REQUEST */
9c58b7dd 2601 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2602 /* INVALID FIELD IN CDB */
9c58b7dd 2603 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2604 break;
2605 case TCM_INVALID_PARAMETER_LIST:
2606 /* CURRENT ERROR */
9c58b7dd
RD		 2607 buffer[0] = 0x70;
2608 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2609 /* ILLEGAL REQUEST */
9c58b7dd 2610 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2611 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2612 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2613 break;
bb992e72
RD		 2614 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2615 /* CURRENT ERROR */
2616 buffer[0] = 0x70;
2617 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2618 /* ILLEGAL REQUEST */
2619 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2620 /* PARAMETER LIST LENGTH ERROR */
2621 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2622 break;
c66ac9db
NB		 2623 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2624 /* CURRENT ERROR */
9c58b7dd
RD		 2625 buffer[0] = 0x70;
2626 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2627 /* ABORTED COMMAND */
9c58b7dd 2628 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2629 /* WRITE ERROR */
9c58b7dd 2630 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2631 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2632 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2633 break;
2634 case TCM_SERVICE_CRC_ERROR:
2635 /* CURRENT ERROR */
9c58b7dd
RD		 2636 buffer[0] = 0x70;
2637 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2638 /* ABORTED COMMAND */
9c58b7dd 2639 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2640 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2641 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2642 /* N/A */
9c58b7dd 2643 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2644 break;
2645 case TCM_SNACK_REJECTED:
2646 /* CURRENT ERROR */
9c58b7dd
RD		 2647 buffer[0] = 0x70;
2648 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2649 /* ABORTED COMMAND */
9c58b7dd 2650 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2651 /* READ ERROR */
9c58b7dd 2652 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2653 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2654 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2655 break;
2656 case TCM_WRITE_PROTECTED:
2657 /* CURRENT ERROR */
9c58b7dd
RD		 2658 buffer[0] = 0x70;
2659 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2660 /* DATA PROTECT */
9c58b7dd 2661 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2662 /* WRITE PROTECTED */
9c58b7dd 2663 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2664 break;
e2397c70
RD		 2665 case TCM_ADDRESS_OUT_OF_RANGE:
2666 /* CURRENT ERROR */
9c58b7dd
RD		 2667 buffer[0] = 0x70;
2668 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2669 /* ILLEGAL REQUEST */
9c58b7dd 2670 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2671 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2672 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2673 break;
c66ac9db
NB		 2674 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2675 /* CURRENT ERROR */
9c58b7dd
RD		 2676 buffer[0] = 0x70;
2677 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2678 /* UNIT ATTENTION */
9c58b7dd 2679 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2680 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2681 buffer[SPC_ASC_KEY_OFFSET] = asc;
2682 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2683 break;
2684 case TCM_CHECK_CONDITION_NOT_READY:
2685 /* CURRENT ERROR */
9c58b7dd
RD		 2686 buffer[0] = 0x70;
2687 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2688 /* Not Ready */
9c58b7dd 2689 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2690 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2691 buffer[SPC_ASC_KEY_OFFSET] = asc;
2692 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2693 break;
818b571c
NB		 2694 case TCM_MISCOMPARE_VERIFY:
2695 /* CURRENT ERROR */
2696 buffer[0] = 0x70;
2697 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2698 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2699 /* MISCOMPARE DURING VERIFY OPERATION */
2700 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2701 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2702 break;
fcc4f17b
NB		 2703 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2704 /* CURRENT ERROR */
2705 buffer[0] = 0x70;
2706 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2707 /* ILLEGAL REQUEST */
2708 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2709 /* LOGICAL BLOCK GUARD CHECK FAILED */
2710 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2711 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
76736db3 2712 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2713 break;
2714 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2715 /* CURRENT ERROR */
2716 buffer[0] = 0x70;
2717 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2718 /* ILLEGAL REQUEST */
2719 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2720 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2721 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2722 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
76736db3 2723 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2724 break;
2725 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2726 /* CURRENT ERROR */
2727 buffer[0] = 0x70;
2728 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2729 /* ILLEGAL REQUEST */
2730 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2731 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2732 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2733 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
76736db3 2734 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b 2735 break;
c66ac9db
NB		 2736 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2737 default:
2738 /* CURRENT ERROR */
9c58b7dd
RD		 2739 buffer[0] = 0x70;
2740 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2741 /*
2742 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2743 * Solaris initiators. Returning NOT READY instead means the
2744 * operations will be retried a finite number of times and we
2745 * can survive intermittent errors.
2746 */
2747 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2748 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2749 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2750 break;
2751 }
2752 /*
2753 * This code uses linux/include/scsi/scsi.h SAM status codes!
2754 */
2755 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2756 /*
2757 * Automatically padded, this value is encoded in the fabric's
2758 * data_length response PDU containing the SCSI defined sense data.
2759 */
9c58b7dd 2760 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2761
2762after_reason:
e5c0d6ad 2763 trace_target_cmd_complete(cmd);
07bde79a 2764 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2765}
2766EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2767
2768int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2769{
c18bc7d8
RD		 2770 if (!(cmd->transport_state & CMD_T_ABORTED))
2771 return 0;
c66ac9db 2772
c18bc7d8
RD		 2773 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2774 return 1;
8b1e1244 2775
c18bc7d8
RD		 2776 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2777 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2778
c18bc7d8 2779 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
29f4c090 2780 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2781 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2782 cmd->se_tfo->queue_status(cmd);
2783
2784 return 1;
c66ac9db
NB		 2785}
2786EXPORT_SYMBOL(transport_check_aborted_status);
2787
2788void transport_send_task_abort(struct se_cmd *cmd)
2789{
c252f003
NB		 2790 unsigned long flags;
2791
2792 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2793 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2794 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2795 return;
2796 }
2797 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2798
c66ac9db
NB		 2799 /*
2800 * If there are still expected incoming fabric WRITEs, we wait
2801 * until until they have completed before sending a TASK_ABORTED
2802 * response. This response with TASK_ABORTED status will be
2803 * queued back to fabric module by transport_check_aborted_status().
2804 */
2805 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2806 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2807 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2808 smp_mb__after_atomic_inc();
29f4c090 2809 return;
c66ac9db
NB		 2810 }
2811 }
2812 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2813
72b59d6e
RD		 2814 transport_lun_remove_cmd(cmd);
2815
6708bb27 2816 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2817 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2818 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2819
e5c0d6ad 2820 trace_target_cmd_complete(cmd);
e3d6f909 2821 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2822}
2823
af877292 2824static void target_tmr_work(struct work_struct *work)
c66ac9db 2825{
af877292 2826 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2827 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2828 struct se_tmr_req *tmr = cmd->se_tmr_req;
2829 int ret;
2830
2831 switch (tmr->function) {
5c6cd613 2832 case TMR_ABORT_TASK:
3d28934a 2833 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2834 break;
5c6cd613
NB		 2835 case TMR_ABORT_TASK_SET:
2836 case TMR_CLEAR_ACA:
2837 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2838 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2839 break;
5c6cd613 2840 case TMR_LUN_RESET:
c66ac9db
NB		 2841 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2842 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2843 TMR_FUNCTION_REJECTED;
2844 break;
5c6cd613 2845 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2846 tmr->response = TMR_FUNCTION_REJECTED;
2847 break;
5c6cd613 2848 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2849 tmr->response = TMR_FUNCTION_REJECTED;
2850 break;
c66ac9db 2851 default:
6708bb27 2852 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2853 tmr->function);
2854 tmr->response = TMR_FUNCTION_REJECTED;
2855 break;
2856 }
2857
2858 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2859 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2860
b7b8bef7 2861 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2862}
2863
af877292
CH		 2864int transport_generic_handle_tmr(
2865 struct se_cmd *cmd)
c66ac9db 2866{
af877292
CH		 2867 INIT_WORK(&cmd->work, target_tmr_work);
2868 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2869 return 0;
2870}
af877292 2871EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux kernel - Deliverables
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