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target: support zero allocation length in REQUEST SENSE
[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 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
015487b8 40#include <linux/ratelimit.h>
c66ac9db
NB		 41#include <asm/unaligned.h>
42#include <net/sock.h>
43#include <net/tcp.h>
44#include <scsi/scsi.h>
45#include <scsi/scsi_cmnd.h>
e66ecd50 46#include <scsi/scsi_tcq.h>
c66ac9db
NB		 47
48#include <target/target_core_base.h>
c4795fb2
CH		 49#include <target/target_core_backend.h>
50#include <target/target_core_fabric.h>
c66ac9db
NB		 51#include <target/target_core_configfs.h>
52
e26d99ae 53#include "target_core_internal.h"
c66ac9db 54#include "target_core_alua.h"
c66ac9db 55#include "target_core_pr.h"
c66ac9db
NB		 56#include "target_core_ua.h"
57
e3d6f909 58static int sub_api_initialized;
c66ac9db 59
35e0e757 60static struct workqueue_struct *target_completion_wq;
c66ac9db 61static struct kmem_cache *se_sess_cache;
c66ac9db 62struct kmem_cache *se_ua_cache;
c66ac9db
NB		 63struct kmem_cache *t10_pr_reg_cache;
64struct kmem_cache *t10_alua_lu_gp_cache;
65struct kmem_cache *t10_alua_lu_gp_mem_cache;
66struct kmem_cache *t10_alua_tg_pt_gp_cache;
67struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
68
c66ac9db 69static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 70static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 71 struct se_device *dev);
05d1c7c0 72static int transport_generic_get_mem(struct se_cmd *cmd);
bc187ea6 73static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
39c05f32 74static void transport_put_cmd(struct se_cmd *cmd);
c66ac9db 75static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
35e0e757 76static void target_complete_ok_work(struct work_struct *work);
c66ac9db 77
e3d6f909 78int init_se_kmem_caches(void)
c66ac9db 79{
c66ac9db
NB		 80 se_sess_cache = kmem_cache_create("se_sess_cache",
81 sizeof(struct se_session), __alignof__(struct se_session),
82 0, NULL);
6708bb27
AG		 83 if (!se_sess_cache) {
84 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 85 " failed\n");
c8e31f26 86 goto out;
c66ac9db
NB		 87 }
88 se_ua_cache = kmem_cache_create("se_ua_cache",
89 sizeof(struct se_ua), __alignof__(struct se_ua),
90 0, NULL);
6708bb27
AG		 91 if (!se_ua_cache) {
92 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 93 goto out_free_sess_cache;
c66ac9db 94 }
c66ac9db
NB		 95 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
96 sizeof(struct t10_pr_registration),
97 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 98 if (!t10_pr_reg_cache) {
99 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 100 " failed\n");
35e0e757 101 goto out_free_ua_cache;
c66ac9db
NB		 102 }
103 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
104 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
105 0, NULL);
6708bb27
AG		 106 if (!t10_alua_lu_gp_cache) {
107 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 108 " failed\n");
35e0e757 109 goto out_free_pr_reg_cache;
c66ac9db
NB		 110 }
111 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
112 sizeof(struct t10_alua_lu_gp_member),
113 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 114 if (!t10_alua_lu_gp_mem_cache) {
115 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 116 "cache failed\n");
35e0e757 117 goto out_free_lu_gp_cache;
c66ac9db
NB		 118 }
119 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
120 sizeof(struct t10_alua_tg_pt_gp),
121 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 122 if (!t10_alua_tg_pt_gp_cache) {
123 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 124 "cache failed\n");
35e0e757 125 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 126 }
127 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
128 "t10_alua_tg_pt_gp_mem_cache",
129 sizeof(struct t10_alua_tg_pt_gp_member),
130 __alignof__(struct t10_alua_tg_pt_gp_member),
131 0, NULL);
6708bb27
AG		 132 if (!t10_alua_tg_pt_gp_mem_cache) {
133 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 134 "mem_t failed\n");
35e0e757 135 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 136 }
137
35e0e757
CH		 138 target_completion_wq = alloc_workqueue("target_completion",
139 WQ_MEM_RECLAIM, 0);
140 if (!target_completion_wq)
141 goto out_free_tg_pt_gp_mem_cache;
142
c66ac9db 143 return 0;
35e0e757
CH		 144
145out_free_tg_pt_gp_mem_cache:
146 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
147out_free_tg_pt_gp_cache:
148 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
149out_free_lu_gp_mem_cache:
150 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
151out_free_lu_gp_cache:
152 kmem_cache_destroy(t10_alua_lu_gp_cache);
153out_free_pr_reg_cache:
154 kmem_cache_destroy(t10_pr_reg_cache);
155out_free_ua_cache:
156 kmem_cache_destroy(se_ua_cache);
157out_free_sess_cache:
158 kmem_cache_destroy(se_sess_cache);
c66ac9db 159out:
e3d6f909 160 return -ENOMEM;
c66ac9db
NB		 161}
162
e3d6f909 163void release_se_kmem_caches(void)
c66ac9db 164{
35e0e757 165 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 166 kmem_cache_destroy(se_sess_cache);
167 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 168 kmem_cache_destroy(t10_pr_reg_cache);
169 kmem_cache_destroy(t10_alua_lu_gp_cache);
170 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
171 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
172 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 173}
174
e3d6f909
AG		 175/* This code ensures unique mib indexes are handed out. */
176static DEFINE_SPINLOCK(scsi_mib_index_lock);
177static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 178
179/*
180 * Allocate a new row index for the entry type specified
181 */
182u32 scsi_get_new_index(scsi_index_t type)
183{
184 u32 new_index;
185
e3d6f909 186 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 187
e3d6f909
AG		 188 spin_lock(&scsi_mib_index_lock);
189 new_index = ++scsi_mib_index[type];
190 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 191
192 return new_index;
193}
194
dbc5623e 195void transport_subsystem_check_init(void)
c66ac9db
NB		 196{
197 int ret;
198
dbc5623e
NB		 199 if (sub_api_initialized)
200 return;
201
c66ac9db
NB		 202 ret = request_module("target_core_iblock");
203 if (ret != 0)
6708bb27 204 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 205
206 ret = request_module("target_core_file");
207 if (ret != 0)
6708bb27 208 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 209
210 ret = request_module("target_core_pscsi");
211 if (ret != 0)
6708bb27 212 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 213
214 ret = request_module("target_core_stgt");
215 if (ret != 0)
6708bb27 216 pr_err("Unable to load target_core_stgt\n");
c66ac9db 217
e3d6f909 218 sub_api_initialized = 1;
dbc5623e 219 return;
c66ac9db
NB		 220}
221
222struct se_session *transport_init_session(void)
223{
224 struct se_session *se_sess;
225
226 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 227 if (!se_sess) {
228 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 229 " se_sess_cache\n");
230 return ERR_PTR(-ENOMEM);
231 }
232 INIT_LIST_HEAD(&se_sess->sess_list);
233 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 234 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
a17f091d 235 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 236 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 237
238 return se_sess;
239}
240EXPORT_SYMBOL(transport_init_session);
241
242/*
140854cb 243 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 244 */
245void __transport_register_session(
246 struct se_portal_group *se_tpg,
247 struct se_node_acl *se_nacl,
248 struct se_session *se_sess,
249 void *fabric_sess_ptr)
250{
251 unsigned char buf[PR_REG_ISID_LEN];
252
253 se_sess->se_tpg = se_tpg;
254 se_sess->fabric_sess_ptr = fabric_sess_ptr;
255 /*
256 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
257 *
258 * Only set for struct se_session's that will actually be moving I/O.
259 * eg: *NOT* discovery sessions.
260 */
261 if (se_nacl) {
262 /*
263 * If the fabric module supports an ISID based TransportID,
264 * save this value in binary from the fabric I_T Nexus now.
265 */
e3d6f909 266 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 267 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 268 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 269 &buf[0], PR_REG_ISID_LEN);
270 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
271 }
afb999ff
NB		 272 kref_get(&se_nacl->acl_kref);
273
c66ac9db
NB		 274 spin_lock_irq(&se_nacl->nacl_sess_lock);
275 /*
276 * The se_nacl->nacl_sess pointer will be set to the
277 * last active I_T Nexus for each struct se_node_acl.
278 */
279 se_nacl->nacl_sess = se_sess;
280
281 list_add_tail(&se_sess->sess_acl_list,
282 &se_nacl->acl_sess_list);
283 spin_unlock_irq(&se_nacl->nacl_sess_lock);
284 }
285 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
286
6708bb27 287 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 288 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 289}
290EXPORT_SYMBOL(__transport_register_session);
291
292void transport_register_session(
293 struct se_portal_group *se_tpg,
294 struct se_node_acl *se_nacl,
295 struct se_session *se_sess,
296 void *fabric_sess_ptr)
297{
140854cb
NB		 298 unsigned long flags;
299
300 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 301 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 302 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 303}
304EXPORT_SYMBOL(transport_register_session);
305
4149268e 306void target_release_session(struct kref *kref)
41ac82b6
NB		 307{
308 struct se_session *se_sess = container_of(kref,
309 struct se_session, sess_kref);
310 struct se_portal_group *se_tpg = se_sess->se_tpg;
311
312 se_tpg->se_tpg_tfo->close_session(se_sess);
313}
314
315void target_get_session(struct se_session *se_sess)
316{
317 kref_get(&se_sess->sess_kref);
318}
319EXPORT_SYMBOL(target_get_session);
320
33933a0e 321void target_put_session(struct se_session *se_sess)
41ac82b6 322{
4149268e
JE		 323 struct se_portal_group *tpg = se_sess->se_tpg;
324
325 if (tpg->se_tpg_tfo->put_session != NULL) {
326 tpg->se_tpg_tfo->put_session(se_sess);
327 return;
328 }
33933a0e 329 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 330}
331EXPORT_SYMBOL(target_put_session);
332
afb999ff
NB		 333static void target_complete_nacl(struct kref *kref)
334{
335 struct se_node_acl *nacl = container_of(kref,
336 struct se_node_acl, acl_kref);
337
338 complete(&nacl->acl_free_comp);
339}
340
341void target_put_nacl(struct se_node_acl *nacl)
342{
343 kref_put(&nacl->acl_kref, target_complete_nacl);
344}
345
c66ac9db
NB		 346void transport_deregister_session_configfs(struct se_session *se_sess)
347{
348 struct se_node_acl *se_nacl;
23388864 349 unsigned long flags;
c66ac9db
NB		 350 /*
351 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
352 */
353 se_nacl = se_sess->se_node_acl;
6708bb27 354 if (se_nacl) {
23388864 355 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 356 if (se_nacl->acl_stop == 0)
357 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 358 /*
359 * If the session list is empty, then clear the pointer.
360 * Otherwise, set the struct se_session pointer from the tail
361 * element of the per struct se_node_acl active session list.
362 */
363 if (list_empty(&se_nacl->acl_sess_list))
364 se_nacl->nacl_sess = NULL;
365 else {
366 se_nacl->nacl_sess = container_of(
367 se_nacl->acl_sess_list.prev,
368 struct se_session, sess_acl_list);
369 }
23388864 370 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 371 }
372}
373EXPORT_SYMBOL(transport_deregister_session_configfs);
374
375void transport_free_session(struct se_session *se_sess)
376{
377 kmem_cache_free(se_sess_cache, se_sess);
378}
379EXPORT_SYMBOL(transport_free_session);
380
381void transport_deregister_session(struct se_session *se_sess)
382{
383 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 384 struct target_core_fabric_ops *se_tfo;
c66ac9db 385 struct se_node_acl *se_nacl;
e63a8e19 386 unsigned long flags;
01468346 387 bool comp_nacl = true;
c66ac9db 388
6708bb27 389 if (!se_tpg) {
c66ac9db
NB		 390 transport_free_session(se_sess);
391 return;
392 }
01468346 393 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 394
e63a8e19 395 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 396 list_del(&se_sess->sess_list);
397 se_sess->se_tpg = NULL;
398 se_sess->fabric_sess_ptr = NULL;
e63a8e19 399 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 400
401 /*
402 * Determine if we need to do extra work for this initiator node's
403 * struct se_node_acl if it had been previously dynamically generated.
404 */
405 se_nacl = se_sess->se_node_acl;
01468346
NB		 406
407 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
408 if (se_nacl && se_nacl->dynamic_node_acl) {
409 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
410 list_del(&se_nacl->acl_list);
411 se_tpg->num_node_acls--;
412 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
413 core_tpg_wait_for_nacl_pr_ref(se_nacl);
414 core_free_device_list_for_node(se_nacl, se_tpg);
415 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
416
417 comp_nacl = false;
418 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 419 }
c66ac9db 420 }
01468346 421 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 422
6708bb27 423 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 424 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 425 /*
afb999ff
NB		 426 * If last kref is dropping now for an explict NodeACL, awake sleeping
427 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
428 * removal context.
01468346
NB		 429 */
430 if (se_nacl && comp_nacl == true)
afb999ff 431 target_put_nacl(se_nacl);
01468346 432
afb999ff 433 transport_free_session(se_sess);
c66ac9db
NB		 434}
435EXPORT_SYMBOL(transport_deregister_session);
436
437/*
a1d8b49a 438 * Called with cmd->t_state_lock held.
c66ac9db 439 */
cf572a96 440static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 441{
42bf829e 442 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 443 unsigned long flags;
444
42bf829e
CH		 445 if (!dev)
446 return;
c66ac9db 447
cf572a96
CH		 448 if (cmd->transport_state & CMD_T_BUSY)
449 return;
c66ac9db 450
cf572a96
CH		 451 spin_lock_irqsave(&dev->execute_task_lock, flags);
452 if (cmd->state_active) {
453 list_del(&cmd->state_list);
cf572a96 454 cmd->state_active = false;
c66ac9db 455 }
cf572a96 456 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 457}
458
f7113a47 459static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
c66ac9db
NB		 460{
461 unsigned long flags;
462
a1d8b49a 463 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 464 /*
465 * Determine if IOCTL context caller in requesting the stopping of this
466 * command for LUN shutdown purposes.
467 */
7d680f3b
CH		 468 if (cmd->transport_state & CMD_T_LUN_STOP) {
469 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
470 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 471
7d680f3b 472 cmd->transport_state &= ~CMD_T_ACTIVE;
f7113a47 473 if (remove_from_lists)
cf572a96 474 target_remove_from_state_list(cmd);
a1d8b49a 475 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 476
a1d8b49a 477 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 478 return 1;
479 }
f7113a47
CH		 480
481 if (remove_from_lists) {
482 target_remove_from_state_list(cmd);
483
484 /*
485 * Clear struct se_cmd->se_lun before the handoff to FE.
486 */
487 cmd->se_lun = NULL;
488 }
489
c66ac9db
NB		 490 /*
491 * Determine if frontend context caller is requesting the stopping of
e3d6f909 492 * this command for frontend exceptions.
c66ac9db 493 */
7d680f3b
CH		 494 if (cmd->transport_state & CMD_T_STOP) {
495 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
496 __func__, __LINE__,
e3d6f909 497 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 498
a1d8b49a 499 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 500
a1d8b49a 501 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 502 return 1;
503 }
f7113a47
CH		 504
505 cmd->transport_state &= ~CMD_T_ACTIVE;
506 if (remove_from_lists) {
507 /*
508 * Some fabric modules like tcm_loop can release
509 * their internally allocated I/O reference now and
510 * struct se_cmd now.
511 *
512 * Fabric modules are expected to return '1' here if the
513 * se_cmd being passed is released at this point,
514 * or zero if not being released.
515 */
516 if (cmd->se_tfo->check_stop_free != NULL) {
517 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
518 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 519 }
f7113a47 520 }
c66ac9db 521
a1d8b49a 522 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 523 return 0;
524}
525
526static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
527{
f7113a47 528 return transport_cmd_check_stop(cmd, true);
c66ac9db
NB		 529}
530
531static void transport_lun_remove_cmd(struct se_cmd *cmd)
532{
e3d6f909 533 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 534 unsigned long flags;
535
536 if (!lun)
537 return;
538
a1d8b49a 539 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 540 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
541 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 542 target_remove_from_state_list(cmd);
c66ac9db 543 }
a1d8b49a 544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 545
c66ac9db 546 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 547 if (!list_empty(&cmd->se_lun_node))
548 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 549 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
550}
551
552void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
553{
c8e31f26 554 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
8dc52b54 555 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 556
557 if (transport_cmd_check_stop_to_fabric(cmd))
558 return;
af877292 559 if (remove)
e6a2573f 560 transport_put_cmd(cmd);
c66ac9db
NB		 561}
562
35e0e757
CH		 563static void target_complete_failure_work(struct work_struct *work)
564{
565 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
566
03e98c9e 567 transport_generic_request_failure(cmd);
35e0e757
CH		 568}
569
6138ed2a 570/*
d5829eac
PB		 571 * Used when asking transport to copy Sense Data from the underlying
572 * Linux/SCSI struct scsi_cmnd
6138ed2a 573 */
d5829eac 574static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 575{
d5829eac 576 unsigned char *buffer = cmd->sense_buffer;
6138ed2a 577 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 578 u32 offset = 0;
579
580 WARN_ON(!cmd->se_lun);
581
582 if (!dev)
d5829eac 583 return NULL;
6138ed2a 584
d5829eac
PB		 585 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
586 return NULL;
6138ed2a
PB		 587
588 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
589
6138ed2a
PB		 590 /* Automatically padded */
591 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
592
d5829eac 593 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 594 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
d5829eac 595 return &buffer[offset];
6138ed2a
PB		 596}
597
5787cacd 598void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 599{
42bf829e 600 struct se_device *dev = cmd->se_dev;
5787cacd 601 int success = scsi_status == GOOD;
c66ac9db 602 unsigned long flags;
c66ac9db 603
5787cacd
CH		 604 cmd->scsi_status = scsi_status;
605
606
a1d8b49a 607 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 608 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 609
c66ac9db 610 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 611 dev->transport->transport_complete(cmd,
612 cmd->t_data_sg,
613 transport_get_sense_buffer(cmd));
614 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 615 success = 1;
c66ac9db
NB		 616 }
617
618 /*
5787cacd 619 * See if we are waiting to complete for an exception condition.
c66ac9db 620 */
cf572a96 621 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 622 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 623 complete(&cmd->task_stop_comp);
c66ac9db
NB		 624 return;
625 }
2235007c
CH		 626
627 if (!success)
7d680f3b 628 cmd->transport_state |= CMD_T_FAILED;
2235007c 629
3d28934a
NB		 630 /*
631 * Check for case where an explict ABORT_TASK has been received
632 * and transport_wait_for_tasks() will be waiting for completion..
633 */
634 if (cmd->transport_state & CMD_T_ABORTED &&
635 cmd->transport_state & CMD_T_STOP) {
636 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
637 complete(&cmd->t_transport_stop_comp);
638 return;
639 } else if (cmd->transport_state & CMD_T_FAILED) {
41e16e98 640 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 641 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 642 } else {
35e0e757 643 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 644 }
35e0e757 645
35e0e757 646 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 647 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 648 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 649
35e0e757 650 queue_work(target_completion_wq, &cmd->work);
c66ac9db 651}
6bb35e00
CH		 652EXPORT_SYMBOL(target_complete_cmd);
653
cf572a96 654static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 655{
cf572a96
CH		 656 struct se_device *dev = cmd->se_dev;
657 unsigned long flags;
c66ac9db 658
cf572a96
CH		 659 spin_lock_irqsave(&dev->execute_task_lock, flags);
660 if (!cmd->state_active) {
661 list_add_tail(&cmd->state_list, &dev->state_list);
662 cmd->state_active = true;
c66ac9db 663 }
cf572a96 664 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 665}
666
07bde79a 667/*
f147abb4 668 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 669 */
7a6f0a1e
CH		 670static void transport_write_pending_qf(struct se_cmd *cmd);
671static void transport_complete_qf(struct se_cmd *cmd);
07bde79a
NB		 672
673static void target_qf_do_work(struct work_struct *work)
674{
675 struct se_device *dev = container_of(work, struct se_device,
676 qf_work_queue);
bcac364a 677 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 678 struct se_cmd *cmd, *cmd_tmp;
679
680 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 681 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
682 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 683
bcac364a 684 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 685 list_del(&cmd->se_qf_node);
686 atomic_dec(&dev->dev_qf_count);
687 smp_mb__after_atomic_dec();
07bde79a 688
6708bb27 689 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 690 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 691 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 692 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
693 : "UNKNOWN");
f7a5cc0b 694
7a6f0a1e
CH		 695 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
696 transport_write_pending_qf(cmd);
697 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
698 transport_complete_qf(cmd);
07bde79a 699 }
07bde79a
NB		 700}
701
c66ac9db
NB		 702unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
703{
704 switch (cmd->data_direction) {
705 case DMA_NONE:
706 return "NONE";
707 case DMA_FROM_DEVICE:
708 return "READ";
709 case DMA_TO_DEVICE:
710 return "WRITE";
711 case DMA_BIDIRECTIONAL:
712 return "BIDI";
713 default:
714 break;
715 }
716
717 return "UNKNOWN";
718}
719
720void transport_dump_dev_state(
721 struct se_device *dev,
722 char *b,
723 int *bl)
724{
725 *bl += sprintf(b + *bl, "Status: ");
726 switch (dev->dev_status) {
727 case TRANSPORT_DEVICE_ACTIVATED:
728 *bl += sprintf(b + *bl, "ACTIVATED");
729 break;
730 case TRANSPORT_DEVICE_DEACTIVATED:
731 *bl += sprintf(b + *bl, "DEACTIVATED");
732 break;
733 case TRANSPORT_DEVICE_SHUTDOWN:
734 *bl += sprintf(b + *bl, "SHUTDOWN");
735 break;
736 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
737 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
738 *bl += sprintf(b + *bl, "OFFLINE");
739 break;
740 default:
741 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
742 break;
743 }
744
5f41a31d 745 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd
NB		 746 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
747 dev->se_sub_dev->se_dev_attrib.block_size,
748 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
c66ac9db
NB		 749 *bl += sprintf(b + *bl, " ");
750}
751
c66ac9db
NB		 752void transport_dump_vpd_proto_id(
753 struct t10_vpd *vpd,
754 unsigned char *p_buf,
755 int p_buf_len)
756{
757 unsigned char buf[VPD_TMP_BUF_SIZE];
758 int len;
759
760 memset(buf, 0, VPD_TMP_BUF_SIZE);
761 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
762
763 switch (vpd->protocol_identifier) {
764 case 0x00:
765 sprintf(buf+len, "Fibre Channel\n");
766 break;
767 case 0x10:
768 sprintf(buf+len, "Parallel SCSI\n");
769 break;
770 case 0x20:
771 sprintf(buf+len, "SSA\n");
772 break;
773 case 0x30:
774 sprintf(buf+len, "IEEE 1394\n");
775 break;
776 case 0x40:
777 sprintf(buf+len, "SCSI Remote Direct Memory Access"
778 " Protocol\n");
779 break;
780 case 0x50:
781 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
782 break;
783 case 0x60:
784 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
785 break;
786 case 0x70:
787 sprintf(buf+len, "Automation/Drive Interface Transport"
788 " Protocol\n");
789 break;
790 case 0x80:
791 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
792 break;
793 default:
794 sprintf(buf+len, "Unknown 0x%02x\n",
795 vpd->protocol_identifier);
796 break;
797 }
798
799 if (p_buf)
800 strncpy(p_buf, buf, p_buf_len);
801 else
6708bb27 802 pr_debug("%s", buf);
c66ac9db
NB		 803}
804
805void
806transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
807{
808 /*
809 * Check if the Protocol Identifier Valid (PIV) bit is set..
810 *
811 * from spc3r23.pdf section 7.5.1
812 */
813 if (page_83[1] & 0x80) {
814 vpd->protocol_identifier = (page_83[0] & 0xf0);
815 vpd->protocol_identifier_set = 1;
816 transport_dump_vpd_proto_id(vpd, NULL, 0);
817 }
818}
819EXPORT_SYMBOL(transport_set_vpd_proto_id);
820
821int transport_dump_vpd_assoc(
822 struct t10_vpd *vpd,
823 unsigned char *p_buf,
824 int p_buf_len)
825{
826 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 827 int ret = 0;
828 int len;
c66ac9db
NB		 829
830 memset(buf, 0, VPD_TMP_BUF_SIZE);
831 len = sprintf(buf, "T10 VPD Identifier Association: ");
832
833 switch (vpd->association) {
834 case 0x00:
835 sprintf(buf+len, "addressed logical unit\n");
836 break;
837 case 0x10:
838 sprintf(buf+len, "target port\n");
839 break;
840 case 0x20:
841 sprintf(buf+len, "SCSI target device\n");
842 break;
843 default:
844 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 845 ret = -EINVAL;
c66ac9db
NB		 846 break;
847 }
848
849 if (p_buf)
850 strncpy(p_buf, buf, p_buf_len);
851 else
6708bb27 852 pr_debug("%s", buf);
c66ac9db
NB		 853
854 return ret;
855}
856
857int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
858{
859 /*
860 * The VPD identification association..
861 *
862 * from spc3r23.pdf Section 7.6.3.1 Table 297
863 */
864 vpd->association = (page_83[1] & 0x30);
865 return transport_dump_vpd_assoc(vpd, NULL, 0);
866}
867EXPORT_SYMBOL(transport_set_vpd_assoc);
868
869int transport_dump_vpd_ident_type(
870 struct t10_vpd *vpd,
871 unsigned char *p_buf,
872 int p_buf_len)
873{
874 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 875 int ret = 0;
876 int len;
c66ac9db
NB		 877
878 memset(buf, 0, VPD_TMP_BUF_SIZE);
879 len = sprintf(buf, "T10 VPD Identifier Type: ");
880
881 switch (vpd->device_identifier_type) {
882 case 0x00:
883 sprintf(buf+len, "Vendor specific\n");
884 break;
885 case 0x01:
886 sprintf(buf+len, "T10 Vendor ID based\n");
887 break;
888 case 0x02:
889 sprintf(buf+len, "EUI-64 based\n");
890 break;
891 case 0x03:
892 sprintf(buf+len, "NAA\n");
893 break;
894 case 0x04:
895 sprintf(buf+len, "Relative target port identifier\n");
896 break;
897 case 0x08:
898 sprintf(buf+len, "SCSI name string\n");
899 break;
900 default:
901 sprintf(buf+len, "Unsupported: 0x%02x\n",
902 vpd->device_identifier_type);
e3d6f909 903 ret = -EINVAL;
c66ac9db
NB		 904 break;
905 }
906
e3d6f909
AG		 907 if (p_buf) {
908 if (p_buf_len < strlen(buf)+1)
909 return -EINVAL;
c66ac9db 910 strncpy(p_buf, buf, p_buf_len);
e3d6f909 911 } else {
6708bb27 912 pr_debug("%s", buf);
e3d6f909 913 }
c66ac9db
NB		 914
915 return ret;
916}
917
918int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
919{
920 /*
921 * The VPD identifier type..
922 *
923 * from spc3r23.pdf Section 7.6.3.1 Table 298
924 */
925 vpd->device_identifier_type = (page_83[1] & 0x0f);
926 return transport_dump_vpd_ident_type(vpd, NULL, 0);
927}
928EXPORT_SYMBOL(transport_set_vpd_ident_type);
929
930int transport_dump_vpd_ident(
931 struct t10_vpd *vpd,
932 unsigned char *p_buf,
933 int p_buf_len)
934{
935 unsigned char buf[VPD_TMP_BUF_SIZE];
936 int ret = 0;
937
938 memset(buf, 0, VPD_TMP_BUF_SIZE);
939
940 switch (vpd->device_identifier_code_set) {
941 case 0x01: /* Binary */
942 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
943 &vpd->device_identifier[0]);
944 break;
945 case 0x02: /* ASCII */
946 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
947 &vpd->device_identifier[0]);
948 break;
949 case 0x03: /* UTF-8 */
950 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
951 &vpd->device_identifier[0]);
952 break;
953 default:
954 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
955 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 956 ret = -EINVAL;
c66ac9db
NB		 957 break;
958 }
959
960 if (p_buf)
961 strncpy(p_buf, buf, p_buf_len);
962 else
6708bb27 963 pr_debug("%s", buf);
c66ac9db
NB		 964
965 return ret;
966}
967
968int
969transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
970{
971 static const char hex_str[] = "0123456789abcdef";
972 int j = 0, i = 4; /* offset to start of the identifer */
973
974 /*
975 * The VPD Code Set (encoding)
976 *
977 * from spc3r23.pdf Section 7.6.3.1 Table 296
978 */
979 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
980 switch (vpd->device_identifier_code_set) {
981 case 0x01: /* Binary */
982 vpd->device_identifier[j++] =
983 hex_str[vpd->device_identifier_type];
984 while (i < (4 + page_83[3])) {
985 vpd->device_identifier[j++] =
986 hex_str[(page_83[i] & 0xf0) >> 4];
987 vpd->device_identifier[j++] =
988 hex_str[page_83[i] & 0x0f];
989 i++;
990 }
991 break;
992 case 0x02: /* ASCII */
993 case 0x03: /* UTF-8 */
994 while (i < (4 + page_83[3]))
995 vpd->device_identifier[j++] = page_83[i++];
996 break;
997 default:
998 break;
999 }
1000
1001 return transport_dump_vpd_ident(vpd, NULL, 0);
1002}
1003EXPORT_SYMBOL(transport_set_vpd_ident);
1004
1005static void core_setup_task_attr_emulation(struct se_device *dev)
1006{
1007 /*
1008 * If this device is from Target_Core_Mod/pSCSI, disable the
1009 * SAM Task Attribute emulation.
1010 *
1011 * This is currently not available in upsream Linux/SCSI Target
1012 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1013 */
e3d6f909 1014 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1015 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1016 return;
1017 }
1018
1019 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1020 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1021 " device\n", dev->transport->name,
1022 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1023}
1024
1025static void scsi_dump_inquiry(struct se_device *dev)
1026{
e3d6f909 1027 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1028 char buf[17];
c66ac9db
NB		 1029 int i, device_type;
1030 /*
1031 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1032 */
c66ac9db
NB		 1033 for (i = 0; i < 8; i++)
1034 if (wwn->vendor[i] >= 0x20)
e59a41b6 1035 buf[i] = wwn->vendor[i];
c66ac9db 1036 else
e59a41b6
SAS		 1037 buf[i] = ' ';
1038 buf[i] = '\0';
1039 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1040
c66ac9db
NB		 1041 for (i = 0; i < 16; i++)
1042 if (wwn->model[i] >= 0x20)
e59a41b6 1043 buf[i] = wwn->model[i];
c66ac9db 1044 else
e59a41b6
SAS		 1045 buf[i] = ' ';
1046 buf[i] = '\0';
1047 pr_debug(" Model: %s\n", buf);
c66ac9db 1048
c66ac9db
NB		 1049 for (i = 0; i < 4; i++)
1050 if (wwn->revision[i] >= 0x20)
e59a41b6 1051 buf[i] = wwn->revision[i];
c66ac9db 1052 else
e59a41b6
SAS		 1053 buf[i] = ' ';
1054 buf[i] = '\0';
1055 pr_debug(" Revision: %s\n", buf);
c66ac9db 1056
e3d6f909 1057 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1058 pr_debug(" Type: %s ", scsi_device_type(device_type));
1059 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1060 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1061}
1062
1063struct se_device *transport_add_device_to_core_hba(
1064 struct se_hba *hba,
1065 struct se_subsystem_api *transport,
1066 struct se_subsystem_dev *se_dev,
1067 u32 device_flags,
1068 void *transport_dev,
1069 struct se_dev_limits *dev_limits,
1070 const char *inquiry_prod,
1071 const char *inquiry_rev)
1072{
12a18bdc 1073 int force_pt;
c66ac9db
NB		 1074 struct se_device *dev;
1075
1076 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1077 if (!dev) {
1078 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1079 return NULL;
1080 }
c66ac9db
NB		 1081
1082 dev->dev_flags = device_flags;
1083 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1084 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1085 dev->se_hba = hba;
1086 dev->se_sub_dev = se_dev;
1087 dev->transport = transport;
c66ac9db
NB		 1088 INIT_LIST_HEAD(&dev->dev_list);
1089 INIT_LIST_HEAD(&dev->dev_sep_list);
1090 INIT_LIST_HEAD(&dev->dev_tmr_list);
c66ac9db 1091 INIT_LIST_HEAD(&dev->delayed_cmd_list);
cf572a96 1092 INIT_LIST_HEAD(&dev->state_list);
07bde79a 1093 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1094 spin_lock_init(&dev->execute_task_lock);
1095 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1096 spin_lock_init(&dev->dev_reservation_lock);
1097 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1098 spin_lock_init(&dev->se_port_lock);
1099 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1100 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1101 atomic_set(&dev->dev_ordered_id, 0);
1102
1103 se_dev_set_default_attribs(dev, dev_limits);
1104
1105 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1106 dev->creation_time = get_jiffies_64();
1107 spin_lock_init(&dev->stats_lock);
1108
1109 spin_lock(&hba->device_lock);
1110 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1111 hba->dev_count++;
1112 spin_unlock(&hba->device_lock);
1113 /*
1114 * Setup the SAM Task Attribute emulation for struct se_device
1115 */
1116 core_setup_task_attr_emulation(dev);
1117 /*
1118 * Force PR and ALUA passthrough emulation with internal object use.
1119 */
1120 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1121 /*
1122 * Setup the Reservations infrastructure for struct se_device
1123 */
1124 core_setup_reservations(dev, force_pt);
1125 /*
1126 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1127 */
1128 if (core_setup_alua(dev, force_pt) < 0)
2962846d 1129 goto err_dev_list;
c66ac9db
NB		 1130
1131 /*
1132 * Startup the struct se_device processing thread
1133 */
af877292
CH		 1134 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1135 dev->transport->name);
1136 if (!dev->tmr_wq) {
1137 pr_err("Unable to create tmr workqueue for %s\n",
e3d6f909 1138 dev->transport->name);
2962846d 1139 goto err_dev_list;
c66ac9db 1140 }
07bde79a
NB		 1141 /*
1142 * Setup work_queue for QUEUE_FULL
1143 */
1144 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1145 /*
1146 * Preload the initial INQUIRY const values if we are doing
1147 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1148 * passthrough because this is being provided by the backend LLD.
1149 * This is required so that transport_get_inquiry() copies these
1150 * originals once back into DEV_T10_WWN(dev) for the virtual device
1151 * setup.
1152 */
e3d6f909 1153 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1154 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1155 pr_err("All non TCM/pSCSI plugins require"
c66ac9db 1156 " INQUIRY consts\n");
2962846d 1157 goto err_wq;
c66ac9db
NB		 1158 }
1159
e3d6f909
AG		 1160 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1161 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1162 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1163 }
1164 scsi_dump_inquiry(dev);
1165
12a18bdc 1166 return dev;
c66ac9db 1167
2962846d
DC		 1168err_wq:
1169 destroy_workqueue(dev->tmr_wq);
1170err_dev_list:
c66ac9db
NB		 1171 spin_lock(&hba->device_lock);
1172 list_del(&dev->dev_list);
1173 hba->dev_count--;
1174 spin_unlock(&hba->device_lock);
1175
1176 se_release_vpd_for_dev(dev);
1177
c66ac9db
NB		 1178 kfree(dev);
1179
1180 return NULL;
1181}
1182EXPORT_SYMBOL(transport_add_device_to_core_hba);
1183
1fd032ee 1184int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1185{
1186 struct se_device *dev = cmd->se_dev;
1187
1188 if (cmd->unknown_data_length) {
1189 cmd->data_length = size;
1190 } else if (size != cmd->data_length) {
1191 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1192 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1193 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1194 cmd->data_length, size, cmd->t_task_cdb[0]);
1195
9b3b8041
CH		 1196 if (cmd->data_direction == DMA_TO_DEVICE) {
1197 pr_err("Rejecting underflow/overflow"
1198 " WRITE data\n");
1199 goto out_invalid_cdb_field;
1200 }
1201 /*
1202 * Reject READ_* or WRITE_* with overflow/underflow for
1203 * type SCF_SCSI_DATA_CDB.
1204 */
1205 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
1206 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1207 " CDB on non 512-byte sector setup subsystem"
1208 " plugin: %s\n", dev->transport->name);
1209 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1210 goto out_invalid_cdb_field;
1211 }
4c054ba6
NB		 1212 /*
1213 * For the overflow case keep the existing fabric provided
1214 * ->data_length. Otherwise for the underflow case, reset
1215 * ->data_length to the smaller SCSI expected data transfer
1216 * length.
1217 */
9b3b8041
CH		 1218 if (size > cmd->data_length) {
1219 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1220 cmd->residual_count = (size - cmd->data_length);
1221 } else {
1222 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1223 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1224 cmd->data_length = size;
9b3b8041 1225 }
9b3b8041
CH		 1226 }
1227
1228 return 0;
1229
1230out_invalid_cdb_field:
1231 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1232 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1233 return -EINVAL;
1234}
1235
c66ac9db
NB		 1236/*
1237 * Used by fabric modules containing a local struct se_cmd within their
1238 * fabric dependent per I/O descriptor.
1239 */
1240void transport_init_se_cmd(
1241 struct se_cmd *cmd,
1242 struct target_core_fabric_ops *tfo,
1243 struct se_session *se_sess,
1244 u32 data_length,
1245 int data_direction,
1246 int task_attr,
1247 unsigned char *sense_buffer)
1248{
5951146d
AG		 1249 INIT_LIST_HEAD(&cmd->se_lun_node);
1250 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1251 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1252 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1253 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1254 init_completion(&cmd->transport_lun_fe_stop_comp);
1255 init_completion(&cmd->transport_lun_stop_comp);
1256 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1257 init_completion(&cmd->cmd_wait_comp);
cf572a96 1258 init_completion(&cmd->task_stop_comp);
a1d8b49a 1259 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1260 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1261
1262 cmd->se_tfo = tfo;
1263 cmd->se_sess = se_sess;
1264 cmd->data_length = data_length;
1265 cmd->data_direction = data_direction;
1266 cmd->sam_task_attr = task_attr;
1267 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1268
1269 cmd->state_active = false;
c66ac9db
NB		 1270}
1271EXPORT_SYMBOL(transport_init_se_cmd);
1272
1273static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1274{
1275 /*
1276 * Check if SAM Task Attribute emulation is enabled for this
1277 * struct se_device storage object
1278 */
5951146d 1279 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1280 return 0;
1281
e66ecd50 1282 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1283 pr_debug("SAM Task Attribute ACA"
c66ac9db 1284 " emulation is not supported\n");
e3d6f909 1285 return -EINVAL;
c66ac9db
NB		 1286 }
1287 /*
1288 * Used to determine when ORDERED commands should go from
1289 * Dormant to Active status.
1290 */
5951146d 1291 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1292 smp_mb__after_atomic_inc();
6708bb27 1293 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1294 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1295 cmd->se_dev->transport->name);
c66ac9db
NB		 1296 return 0;
1297}
1298
a12f41f8 1299/* target_setup_cmd_from_cdb():
c66ac9db
NB		 1300 *
1301 * Called from fabric RX Thread.
1302 */
a12f41f8 1303int target_setup_cmd_from_cdb(
c66ac9db
NB		 1304 struct se_cmd *cmd,
1305 unsigned char *cdb)
1306{
cb4f4d3c
CH		 1307 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1308 u32 pr_reg_type = 0;
1309 u8 alua_ascq = 0;
1310 unsigned long flags;
c66ac9db
NB		 1311 int ret;
1312
c66ac9db
NB		 1313 /*
1314 * Ensure that the received CDB is less than the max (252 + 8) bytes
1315 * for VARIABLE_LENGTH_CMD
1316 */
1317 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1318 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1319 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1320 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1321 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1322 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1323 return -EINVAL;
c66ac9db
NB		 1324 }
1325 /*
1326 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1327 * allocate the additional extended CDB buffer now.. Otherwise
1328 * setup the pointer from __t_task_cdb to t_task_cdb.
1329 */
a1d8b49a
AG		 1330 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1331 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1332 GFP_KERNEL);
6708bb27
AG		 1333 if (!cmd->t_task_cdb) {
1334 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1335 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1336 scsi_command_size(cdb),
a1d8b49a 1337 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1338 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1339 cmd->scsi_sense_reason =
1340 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1341 return -ENOMEM;
c66ac9db
NB		 1342 }
1343 } else
a1d8b49a 1344 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1345 /*
a1d8b49a 1346 * Copy the original CDB into cmd->
c66ac9db 1347 */
a1d8b49a 1348 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1349
1350 /*
1351 * Check for an existing UNIT ATTENTION condition
1352 */
1353 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1354 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1355 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1356 return -EINVAL;
1357 }
1358
1359 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1360 if (ret != 0) {
1361 /*
1362 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1363 * The ALUA additional sense code qualifier (ASCQ) is determined
1364 * by the ALUA primary or secondary access state..
1365 */
1366 if (ret > 0) {
1367 pr_debug("[%s]: ALUA TG Port not available, "
1368 "SenseKey: NOT_READY, ASC/ASCQ: "
1369 "0x04/0x%02x\n",
1370 cmd->se_tfo->get_fabric_name(), alua_ascq);
1371
1372 transport_set_sense_codes(cmd, 0x04, alua_ascq);
1373 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1374 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1375 return -EINVAL;
1376 }
1377 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1378 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1379 return -EINVAL;
1380 }
1381
1382 /*
1383 * Check status for SPC-3 Persistent Reservations
1384 */
1385 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1386 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1387 cmd, cdb, pr_reg_type) != 0) {
1388 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1389 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1390 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1391 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1392 return -EBUSY;
1393 }
1394 /*
1395 * This means the CDB is allowed for the SCSI Initiator port
1396 * when said port is *NOT* holding the legacy SPC-2 or
1397 * SPC-3 Persistent Reservation.
1398 */
1399 }
1400
1fd032ee 1401 ret = cmd->se_dev->transport->parse_cdb(cmd);
c66ac9db
NB		 1402 if (ret < 0)
1403 return ret;
cb4f4d3c
CH		 1404
1405 spin_lock_irqsave(&cmd->t_state_lock, flags);
1406 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1407 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1408
c66ac9db
NB		 1409 /*
1410 * Check for SAM Task Attribute Emulation
1411 */
1412 if (transport_check_alloc_task_attr(cmd) < 0) {
1413 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1414 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1415 return -EINVAL;
c66ac9db
NB		 1416 }
1417 spin_lock(&cmd->se_lun->lun_sep_lock);
1418 if (cmd->se_lun->lun_sep)
1419 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1420 spin_unlock(&cmd->se_lun->lun_sep_lock);
1421 return 0;
1422}
a12f41f8 1423EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1424
695434e1
NB		 1425/*
1426 * Used by fabric module frontends to queue tasks directly.
1427 * Many only be used from process context only
1428 */
1429int transport_handle_cdb_direct(
1430 struct se_cmd *cmd)
1431{
dd8ae59d
NB		 1432 int ret;
1433
695434e1
NB		 1434 if (!cmd->se_lun) {
1435 dump_stack();
6708bb27 1436 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1437 return -EINVAL;
1438 }
1439 if (in_interrupt()) {
1440 dump_stack();
6708bb27 1441 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1442 " from interrupt context\n");
1443 return -EINVAL;
1444 }
dd8ae59d 1445 /*
af877292
CH		 1446 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1447 * outstanding descriptors are handled correctly during shutdown via
1448 * transport_wait_for_tasks()
dd8ae59d
NB		 1449 *
1450 * Also, we don't take cmd->t_state_lock here as we only expect
1451 * this to be called for initial descriptor submission.
1452 */
1453 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1454 cmd->transport_state |= CMD_T_ACTIVE;
1455
dd8ae59d
NB		 1456 /*
1457 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1458 * so follow TRANSPORT_NEW_CMD processing thread context usage
1459 * and call transport_generic_request_failure() if necessary..
1460 */
1461 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1462 if (ret < 0)
1463 transport_generic_request_failure(cmd);
1464
dd8ae59d 1465 return 0;
695434e1
NB		 1466}
1467EXPORT_SYMBOL(transport_handle_cdb_direct);
1468
a6360785
NB		 1469/**
1470 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1471 *
1472 * @se_cmd: command descriptor to submit
1473 * @se_sess: associated se_sess for endpoint
1474 * @cdb: pointer to SCSI CDB
1475 * @sense: pointer to SCSI sense buffer
1476 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1477 * @data_length: fabric expected data transfer length
1478 * @task_addr: SAM task attribute
1479 * @data_dir: DMA data direction
1480 * @flags: flags for command submission from target_sc_flags_tables
1481 *
d6dfc868
RD		 1482 * Returns non zero to signal active I/O shutdown failure. All other
1483 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1484 * but still return zero here.
1485 *
a6360785
NB		 1486 * This may only be called from process context, and also currently
1487 * assumes internal allocation of fabric payload buffer by target-core.
1488 **/
d6dfc868 1489int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1490 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1491 u32 data_length, int task_attr, int data_dir, int flags)
1492{
1493 struct se_portal_group *se_tpg;
1494 int rc;
1495
1496 se_tpg = se_sess->se_tpg;
1497 BUG_ON(!se_tpg);
1498 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1499 BUG_ON(in_interrupt());
1500 /*
1501 * Initialize se_cmd for target operation. From this point
1502 * exceptions are handled by sending exception status via
1503 * target_core_fabric_ops->queue_status() callback
1504 */
1505 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1506 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1507 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1508 se_cmd->unknown_data_length = 1;
a6360785
NB		 1509 /*
1510 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1511 * se_sess->sess_cmd_list. A second kref_get here is necessary
1512 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1513 * kref_put() to happen during fabric packet acknowledgement.
1514 */
bc187ea6
RD		 1515 rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1516 if (rc)
d6dfc868 1517 return rc;
a6360785
NB		 1518 /*
1519 * Signal bidirectional data payloads to target-core
1520 */
1521 if (flags & TARGET_SCF_BIDI_OP)
1522 se_cmd->se_cmd_flags |= SCF_BIDI;
1523 /*
1524 * Locate se_lun pointer and attach it to struct se_cmd
1525 */
735703ca
NB		 1526 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1527 transport_send_check_condition_and_sense(se_cmd,
1528 se_cmd->scsi_sense_reason, 0);
1529 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1530 return 0;
735703ca 1531 }
d6e0175c 1532
a12f41f8 1533 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca
NB		 1534 if (rc != 0) {
1535 transport_generic_request_failure(se_cmd);
d6dfc868 1536 return 0;
735703ca 1537 }
11e319ed
AG		 1538
1539 /*
1540 * Check if we need to delay processing because of ALUA
1541 * Active/NonOptimized primary access state..
1542 */
1543 core_alua_check_nonop_delay(se_cmd);
1544
a6360785 1545 transport_handle_cdb_direct(se_cmd);
d6dfc868 1546 return 0;
a6360785
NB		 1547}
1548EXPORT_SYMBOL(target_submit_cmd);
1549
9f0d05c2
NB		 1550static void target_complete_tmr_failure(struct work_struct *work)
1551{
1552 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1553
1554 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1555 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1556 transport_generic_free_cmd(se_cmd, 0);
1557}
1558
ea98d7f9
AG		 1559/**
1560 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1561 * for TMR CDBs
1562 *
1563 * @se_cmd: command descriptor to submit
1564 * @se_sess: associated se_sess for endpoint
1565 * @sense: pointer to SCSI sense buffer
1566 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1567 * @fabric_context: fabric context for TMR req
1568 * @tm_type: Type of TM request
c0974f89
NB		 1569 * @gfp: gfp type for caller
1570 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1571 * @flags: submit cmd flags
ea98d7f9
AG		 1572 *
1573 * Callable from all contexts.
1574 **/
1575
c7042cae 1576int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1577 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1578 void *fabric_tmr_ptr, unsigned char tm_type,
1579 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1580{
1581 struct se_portal_group *se_tpg;
1582 int ret;
1583
1584 se_tpg = se_sess->se_tpg;
1585 BUG_ON(!se_tpg);
1586
1587 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1588 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1589 /*
1590 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1591 * allocation failure.
1592 */
c0974f89 1593 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1594 if (ret < 0)
1595 return -ENOMEM;
ea98d7f9 1596
c0974f89
NB		 1597 if (tm_type == TMR_ABORT_TASK)
1598 se_cmd->se_tmr_req->ref_task_tag = tag;
1599
ea98d7f9 1600 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1601 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1602 if (ret) {
1603 core_tmr_release_req(se_cmd->se_tmr_req);
1604 return ret;
1605 }
ea98d7f9 1606
ea98d7f9
AG		 1607 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1608 if (ret) {
9f0d05c2
NB		 1609 /*
1610 * For callback during failure handling, push this work off
1611 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1612 */
1613 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1614 schedule_work(&se_cmd->work);
c7042cae 1615 return 0;
ea98d7f9
AG		 1616 }
1617 transport_generic_handle_tmr(se_cmd);
c7042cae 1618 return 0;
ea98d7f9
AG		 1619}
1620EXPORT_SYMBOL(target_submit_tmr);
1621
cdbb70bb 1622/*
cf572a96 1623 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1624 * has completed.
1625 */
cf572a96 1626bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1627{
cdbb70bb
CH		 1628 bool was_active = false;
1629
cf572a96
CH		 1630 if (cmd->transport_state & CMD_T_BUSY) {
1631 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1632 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1633
cf572a96
CH		 1634 pr_debug("cmd %p waiting to complete\n", cmd);
1635 wait_for_completion(&cmd->task_stop_comp);
1636 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1637
1638 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1639 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1640 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1641 was_active = true;
1642 }
1643
cdbb70bb
CH		 1644 return was_active;
1645}
1646
c66ac9db
NB		 1647/*
1648 * Handle SAM-esque emulation for generic transport request failures.
1649 */
2fbff127 1650void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1651{
07bde79a
NB		 1652 int ret = 0;
1653
6708bb27 1654 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1655 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1656 cmd->t_task_cdb[0]);
03e98c9e 1657 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1658 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1659 cmd->t_state, cmd->scsi_sense_reason);
d43d6aea 1660 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1661 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1662 (cmd->transport_state & CMD_T_STOP) != 0,
1663 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1664
c66ac9db
NB		 1665 /*
1666 * For SAM Task Attribute emulation for failed struct se_cmd
1667 */
1668 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1669 transport_complete_task_attr(cmd);
1670
03e98c9e
NB		 1671 switch (cmd->scsi_sense_reason) {
1672 case TCM_NON_EXISTENT_LUN:
1673 case TCM_UNSUPPORTED_SCSI_OPCODE:
1674 case TCM_INVALID_CDB_FIELD:
1675 case TCM_INVALID_PARAMETER_LIST:
1676 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1677 case TCM_UNKNOWN_MODE_PAGE:
1678 case TCM_WRITE_PROTECTED:
e2397c70 1679 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1680 case TCM_CHECK_CONDITION_ABORT_CMD:
1681 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1682 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1683 break;
03e98c9e 1684 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1685 /*
1686 * No SENSE Data payload for this case, set SCSI Status
1687 * and queue the response to $FABRIC_MOD.
1688 *
1689 * Uses linux/include/scsi/scsi.h SAM status codes defs
1690 */
1691 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1692 /*
1693 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1694 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1695 * CONFLICT STATUS.
1696 *
1697 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1698 */
e3d6f909
AG		 1699 if (cmd->se_sess &&
1700 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1701 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1702 cmd->orig_fe_lun, 0x2C,
1703 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1704
07bde79a 1705 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1706 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1707 goto queue_full;
c66ac9db 1708 goto check_stop;
c66ac9db 1709 default:
6708bb27 1710 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1711 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1712 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1713 break;
1714 }
f3146437 1715
03e98c9e
NB		 1716 ret = transport_send_check_condition_and_sense(cmd,
1717 cmd->scsi_sense_reason, 0);
1718 if (ret == -EAGAIN || ret == -ENOMEM)
1719 goto queue_full;
07bde79a 1720
c66ac9db
NB		 1721check_stop:
1722 transport_lun_remove_cmd(cmd);
6708bb27 1723 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1724 ;
07bde79a
NB		 1725 return;
1726
1727queue_full:
e057f533
CH		 1728 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1729 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1730}
2fbff127 1731EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1732
5f41a31d 1733static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1734{
0c2ad7d1 1735 int error = 0;
5f41a31d
CH		 1736
1737 spin_lock_irq(&cmd->t_state_lock);
1738 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1739 spin_unlock_irq(&cmd->t_state_lock);
1740
1741 if (cmd->execute_cmd)
1742 error = cmd->execute_cmd(cmd);
5f41a31d
CH		 1743
1744 if (error) {
1745 spin_lock_irq(&cmd->t_state_lock);
1746 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1747 spin_unlock_irq(&cmd->t_state_lock);
1748
1749 transport_generic_request_failure(cmd);
1750 }
1751}
1752
70baf0ab 1753void target_execute_cmd(struct se_cmd *cmd)
5f41a31d
CH		 1754{
1755 struct se_device *dev = cmd->se_dev;
1756
d59a02b4
CH		 1757 /*
1758 * If the received CDB has aleady been aborted stop processing it here.
1759 */
1760 if (transport_check_aborted_status(cmd, 1))
1761 return;
1762
f7113a47
CH		 1763 /*
1764 * Determine if IOCTL context caller in requesting the stopping of this
1765 * command for LUN shutdown purposes.
1766 */
1767 spin_lock_irq(&cmd->t_state_lock);
1768 if (cmd->transport_state & CMD_T_LUN_STOP) {
1769 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1770 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1771
1772 cmd->transport_state &= ~CMD_T_ACTIVE;
1773 spin_unlock_irq(&cmd->t_state_lock);
1774 complete(&cmd->transport_lun_stop_comp);
1775 return;
1776 }
1777 /*
1778 * Determine if frontend context caller is requesting the stopping of
1779 * this command for frontend exceptions.
1780 */
1781 if (cmd->transport_state & CMD_T_STOP) {
1782 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1783 __func__, __LINE__,
1784 cmd->se_tfo->get_task_tag(cmd));
1785
1786 spin_unlock_irq(&cmd->t_state_lock);
1787 complete(&cmd->t_transport_stop_comp);
5f41a31d 1788 return;
f7113a47
CH		 1789 }
1790
1791 cmd->t_state = TRANSPORT_PROCESSING;
1792 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d
CH		 1793
1794 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1795 goto execute;
1796
c66ac9db 1797 /*
25985edc 1798 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1799 * to allow the passed struct se_cmd list of tasks to the front of the list.
1800 */
5f41a31d
CH		 1801 switch (cmd->sam_task_attr) {
1802 case MSG_HEAD_TAG:
1803 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1804 "se_ordered_id: %u\n",
1805 cmd->t_task_cdb[0], cmd->se_ordered_id);
1806 goto execute;
1807 case MSG_ORDERED_TAG:
1808 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1809 smp_mb__after_atomic_inc();
1810
5f41a31d
CH		 1811 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1812 " se_ordered_id: %u\n",
1813 cmd->t_task_cdb[0], cmd->se_ordered_id);
1814
c66ac9db 1815 /*
5f41a31d
CH		 1816 * Execute an ORDERED command if no other older commands
1817 * exist that need to be completed first.
c66ac9db 1818 */
5f41a31d
CH		 1819 if (!atomic_read(&dev->simple_cmds))
1820 goto execute;
1821 break;
1822 default:
c66ac9db
NB		 1823 /*
1824 * For SIMPLE and UNTAGGED Task Attribute commands
1825 */
5f41a31d 1826 atomic_inc(&dev->simple_cmds);
c66ac9db 1827 smp_mb__after_atomic_inc();
5f41a31d 1828 break;
c66ac9db 1829 }
5f41a31d
CH		 1830
1831 if (atomic_read(&dev->dev_ordered_sync) != 0) {
1832 spin_lock(&dev->delayed_cmd_lock);
5f41a31d
CH		 1833 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1834 spin_unlock(&dev->delayed_cmd_lock);
c66ac9db 1835
6708bb27 1836 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 1837 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 1838 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db 1839 cmd->se_ordered_id);
5f41a31d 1840 return;
c66ac9db 1841 }
c66ac9db 1842
5f41a31d 1843execute:
c66ac9db 1844 /*
5f41a31d 1845 * Otherwise, no ORDERED task attributes exist..
c66ac9db 1846 */
5f41a31d 1847 __target_execute_cmd(cmd);
c66ac9db 1848}
70baf0ab 1849EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1850
5f41a31d
CH		 1851/*
1852 * Process all commands up to the last received ORDERED task attribute which
1853 * requires another blocking boundary
1854 */
1855static void target_restart_delayed_cmds(struct se_device *dev)
1856{
1857 for (;;) {
1858 struct se_cmd *cmd;
1859
1860 spin_lock(&dev->delayed_cmd_lock);
1861 if (list_empty(&dev->delayed_cmd_list)) {
1862 spin_unlock(&dev->delayed_cmd_lock);
1863 break;
1864 }
1865
1866 cmd = list_entry(dev->delayed_cmd_list.next,
1867 struct se_cmd, se_delayed_node);
1868 list_del(&cmd->se_delayed_node);
1869 spin_unlock(&dev->delayed_cmd_lock);
1870
1871 __target_execute_cmd(cmd);
1872
1873 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1874 break;
1875 }
1876}
1877
c66ac9db 1878/*
35e0e757 1879 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1880 * and ordered cmds need to have their tasks added to the execution queue.
1881 */
1882static void transport_complete_task_attr(struct se_cmd *cmd)
1883{
5951146d 1884 struct se_device *dev = cmd->se_dev;
c66ac9db 1885
e66ecd50 1886 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1887 atomic_dec(&dev->simple_cmds);
1888 smp_mb__after_atomic_dec();
1889 dev->dev_cur_ordered_id++;
6708bb27 1890 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1891 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1892 cmd->se_ordered_id);
e66ecd50 1893 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1894 dev->dev_cur_ordered_id++;
6708bb27 1895 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1896 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1897 cmd->se_ordered_id);
e66ecd50 1898 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1899 atomic_dec(&dev->dev_ordered_sync);
1900 smp_mb__after_atomic_dec();
c66ac9db
NB		 1901
1902 dev->dev_cur_ordered_id++;
6708bb27 1903 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1904 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1905 }
c66ac9db 1906
5f41a31d 1907 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1908}
1909
e057f533 1910static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1911{
1912 int ret = 0;
1913
e057f533
CH		 1914 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1915 transport_complete_task_attr(cmd);
1916
1917 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1918 ret = cmd->se_tfo->queue_status(cmd);
1919 if (ret)
1920 goto out;
1921 }
07bde79a
NB		 1922
1923 switch (cmd->data_direction) {
1924 case DMA_FROM_DEVICE:
1925 ret = cmd->se_tfo->queue_data_in(cmd);
1926 break;
1927 case DMA_TO_DEVICE:
ec98f782 1928 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 1929 ret = cmd->se_tfo->queue_data_in(cmd);
1930 if (ret < 0)
e057f533 1931 break;
07bde79a
NB		 1932 }
1933 /* Fall through for DMA_TO_DEVICE */
1934 case DMA_NONE:
1935 ret = cmd->se_tfo->queue_status(cmd);
1936 break;
1937 default:
1938 break;
1939 }
1940
e057f533
CH		 1941out:
1942 if (ret < 0) {
1943 transport_handle_queue_full(cmd, cmd->se_dev);
1944 return;
1945 }
1946 transport_lun_remove_cmd(cmd);
1947 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1948}
1949
1950static void transport_handle_queue_full(
1951 struct se_cmd *cmd,
e057f533 1952 struct se_device *dev)
07bde79a
NB		 1953{
1954 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1955 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1956 atomic_inc(&dev->dev_qf_count);
1957 smp_mb__after_atomic_inc();
1958 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1959
1960 schedule_work(&cmd->se_dev->qf_work_queue);
1961}
1962
35e0e757 1963static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1964{
35e0e757 1965 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1966 int ret;
35e0e757 1967
c66ac9db
NB		 1968 /*
1969 * Check if we need to move delayed/dormant tasks from cmds on the
1970 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1971 * Attribute.
1972 */
5951146d 1973 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 1974 transport_complete_task_attr(cmd);
07bde79a
NB		 1975 /*
1976 * Check to schedule QUEUE_FULL work, or execute an existing
1977 * cmd->transport_qf_callback()
1978 */
1979 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1980 schedule_work(&cmd->se_dev->qf_work_queue);
1981
c66ac9db 1982 /*
d5829eac 1983 * Check if we need to send a sense buffer from
c66ac9db
NB		 1984 * the struct se_cmd in question.
1985 */
1986 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1987 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1988 ret = transport_send_check_condition_and_sense(
1989 cmd, 0, 1);
1990 if (ret == -EAGAIN || ret == -ENOMEM)
1991 goto queue_full;
1992
1993 transport_lun_remove_cmd(cmd);
1994 transport_cmd_check_stop_to_fabric(cmd);
1995 return;
c66ac9db
NB		 1996 }
1997 /*
25985edc 1998 * Check for a callback, used by amongst other things
c66ac9db
NB		 1999 * XDWRITE_READ_10 emulation.
2000 */
2001 if (cmd->transport_complete_callback)
2002 cmd->transport_complete_callback(cmd);
2003
2004 switch (cmd->data_direction) {
2005 case DMA_FROM_DEVICE:
2006 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2007 if (cmd->se_lun->lun_sep) {
2008 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2009 cmd->data_length;
2010 }
2011 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 2012
07bde79a 2013 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2014 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2015 goto queue_full;
c66ac9db
NB		 2016 break;
2017 case DMA_TO_DEVICE:
2018 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2019 if (cmd->se_lun->lun_sep) {
2020 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2021 cmd->data_length;
2022 }
2023 spin_unlock(&cmd->se_lun->lun_sep_lock);
2024 /*
2025 * Check if we need to send READ payload for BIDI-COMMAND
2026 */
ec98f782 2027 if (cmd->t_bidi_data_sg) {
c66ac9db 2028 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2029 if (cmd->se_lun->lun_sep) {
2030 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2031 cmd->data_length;
2032 }
2033 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2034 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2035 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2036 goto queue_full;
c66ac9db
NB		 2037 break;
2038 }
2039 /* Fall through for DMA_TO_DEVICE */
2040 case DMA_NONE:
07bde79a 2041 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2042 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2043 goto queue_full;
c66ac9db
NB		 2044 break;
2045 default:
2046 break;
2047 }
2048
2049 transport_lun_remove_cmd(cmd);
2050 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2051 return;
2052
2053queue_full:
6708bb27 2054 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2055 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2056 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2057 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2058}
2059
6708bb27 2060static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2061{
ec98f782 2062 struct scatterlist *sg;
ec98f782 2063 int count;
c66ac9db 2064
6708bb27
AG		 2065 for_each_sg(sgl, sg, nents, count)
2066 __free_page(sg_page(sg));
c66ac9db 2067
6708bb27
AG		 2068 kfree(sgl);
2069}
c66ac9db 2070
6708bb27
AG		 2071static inline void transport_free_pages(struct se_cmd *cmd)
2072{
2073 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2074 return;
2075
2076 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2077 cmd->t_data_sg = NULL;
2078 cmd->t_data_nents = 0;
c66ac9db 2079
6708bb27 2080 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2081 cmd->t_bidi_data_sg = NULL;
2082 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2083}
2084
e26d99ae
CH		 2085/**
2086 * transport_release_cmd - free a command
2087 * @cmd: command to free
2088 *
2089 * This routine unconditionally frees a command, and reference counting
2090 * or list removal must be done in the caller.
2091 */
2092static void transport_release_cmd(struct se_cmd *cmd)
2093{
2094 BUG_ON(!cmd->se_tfo);
2095
c8e31f26 2096 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2097 core_tmr_release_req(cmd->se_tmr_req);
2098 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2099 kfree(cmd->t_task_cdb);
2100 /*
7481deb4
NB		 2101 * If this cmd has been setup with target_get_sess_cmd(), drop
2102 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2103 */
7481deb4
NB		 2104 if (cmd->check_release != 0) {
2105 target_put_sess_cmd(cmd->se_sess, cmd);
2106 return;
2107 }
e26d99ae
CH		 2108 cmd->se_tfo->release_cmd(cmd);
2109}
2110
d3df7825
CH		 2111/**
2112 * transport_put_cmd - release a reference to a command
2113 * @cmd: command to release
2114 *
2115 * This routine releases our reference to the command and frees it if possible.
2116 */
39c05f32 2117static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 2118{
2119 unsigned long flags;
c66ac9db 2120
a1d8b49a 2121 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 2122 if (atomic_read(&cmd->t_fe_count)) {
2123 if (!atomic_dec_and_test(&cmd->t_fe_count))
2124 goto out_busy;
2125 }
2126
7d680f3b
CH		 2127 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2128 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2129 target_remove_from_state_list(cmd);
c66ac9db 2130 }
a1d8b49a 2131 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2132
c66ac9db 2133 transport_free_pages(cmd);
31afc39c 2134 transport_release_cmd(cmd);
39c05f32 2135 return;
4911e3cc
CH		 2136out_busy:
2137 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2138}
2139
c66ac9db 2140/*
ec98f782
AG		 2141 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2142 * allocating in the core.
c66ac9db
NB		 2143 * @cmd: Associated se_cmd descriptor
2144 * @mem: SGL style memory for TCM WRITE / READ
2145 * @sg_mem_num: Number of SGL elements
2146 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2147 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2148 *
2149 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2150 * of parameters.
2151 */
2152int transport_generic_map_mem_to_cmd(
2153 struct se_cmd *cmd,
5951146d
AG		 2154 struct scatterlist *sgl,
2155 u32 sgl_count,
2156 struct scatterlist *sgl_bidi,
2157 u32 sgl_bidi_count)
c66ac9db 2158{
5951146d 2159 if (!sgl || !sgl_count)
c66ac9db 2160 return 0;
c66ac9db 2161
64f1db38
CH		 2162 /*
2163 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2164 * scatterlists already have been set to follow what the fabric
2165 * passes for the original expected data transfer length.
2166 */
2167 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2168 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2169 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2170 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2171 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2172 return -EINVAL;
2173 }
c66ac9db 2174
64f1db38
CH		 2175 cmd->t_data_sg = sgl;
2176 cmd->t_data_nents = sgl_count;
c66ac9db 2177
64f1db38
CH		 2178 if (sgl_bidi && sgl_bidi_count) {
2179 cmd->t_bidi_data_sg = sgl_bidi;
2180 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db 2181 }
64f1db38 2182 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 2183 return 0;
2184}
2185EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2186
4949314c 2187void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2188{
ec98f782 2189 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2190 struct page **pages;
2191 int i;
05d1c7c0
AG		 2192
2193 /*
ec98f782
AG		 2194 * We need to take into account a possible offset here for fabrics like
2195 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2196 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2197 */
4949314c
AG		 2198 if (!cmd->t_data_nents)
2199 return NULL;
3717ef0c
PB		 2200
2201 BUG_ON(!sg);
2202 if (cmd->t_data_nents == 1)
4949314c
AG		 2203 return kmap(sg_page(sg)) + sg->offset;
2204
2205 /* >1 page. use vmap */
2206 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3717ef0c
PB		 2207 if (!pages) {
2208 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4949314c 2209 return NULL;
3717ef0c 2210 }
4949314c
AG		 2211
2212 /* convert sg[] to pages[] */
2213 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2214 pages[i] = sg_page(sg);
2215 }
2216
2217 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2218 kfree(pages);
3717ef0c
PB		 2219 if (!cmd->t_data_vmap) {
2220 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4949314c 2221 return NULL;
3717ef0c 2222 }
4949314c
AG		 2223
2224 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2225}
4949314c 2226EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2227
4949314c 2228void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2229{
a1edf9cf 2230 if (!cmd->t_data_nents) {
4949314c 2231 return;
a1edf9cf 2232 } else if (cmd->t_data_nents == 1) {
4949314c 2233 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2234 return;
2235 }
4949314c
AG		 2236
2237 vunmap(cmd->t_data_vmap);
2238 cmd->t_data_vmap = NULL;
05d1c7c0 2239}
4949314c 2240EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2241
c66ac9db 2242static int
05d1c7c0 2243transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2244{
ec98f782
AG		 2245 u32 length = cmd->data_length;
2246 unsigned int nents;
2247 struct page *page;
9db9da33 2248 gfp_t zero_flag;
ec98f782 2249 int i = 0;
c66ac9db 2250
ec98f782
AG		 2251 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2252 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2253 if (!cmd->t_data_sg)
2254 return -ENOMEM;
c66ac9db 2255
ec98f782
AG		 2256 cmd->t_data_nents = nents;
2257 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2258
64f1db38 2259 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2260
ec98f782
AG		 2261 while (length) {
2262 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2263 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2264 if (!page)
2265 goto out;
c66ac9db 2266
ec98f782
AG		 2267 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2268 length -= page_len;
2269 i++;
c66ac9db 2270 }
c66ac9db 2271 return 0;
c66ac9db 2272
ec98f782 2273out:
d0e27c88 2274 while (i > 0) {
ec98f782 2275 i--;
d0e27c88 2276 __free_page(sg_page(&cmd->t_data_sg[i]));
c66ac9db 2277 }
ec98f782
AG		 2278 kfree(cmd->t_data_sg);
2279 cmd->t_data_sg = NULL;
2280 return -ENOMEM;
c66ac9db
NB		 2281}
2282
da0f7619 2283/*
b16a35b0
AG		 2284 * Allocate any required resources to execute the command. For writes we
2285 * might not have the payload yet, so notify the fabric via a call to
2286 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2287 */
a1d8b49a 2288int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2289{
c66ac9db
NB		 2290 int ret = 0;
2291
2292 /*
2293 * Determine is the TCM fabric module has already allocated physical
2294 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2295 * beforehand.
c66ac9db 2296 */
ec98f782
AG		 2297 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2298 cmd->data_length) {
05d1c7c0 2299 ret = transport_generic_get_mem(cmd);
c66ac9db 2300 if (ret < 0)
03e98c9e 2301 goto out_fail;
c66ac9db 2302 }
74f4cf29
NB		 2303 /*
2304 * If this command doesn't have any payload and we don't have to call
2305 * into the fabric for data transfers, go ahead and complete it right
2306 * away.
2307 */
306c11b2
PB		 2308 if (!cmd->data_length &&
2309 (cmd->se_dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV ||
2310 cmd->t_task_cdb[0] == REPORT_LUNS) {
7d680f3b 2311 spin_lock_irq(&cmd->t_state_lock);
410f6702 2312 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 2313 cmd->transport_state |= CMD_T_ACTIVE;
2314 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 2315
2316 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2317 u8 ua_asc = 0, ua_ascq = 0;
2318
2319 core_scsi3_ua_clear_for_request_sense(cmd,
2320 &ua_asc, &ua_ascq);
2321 }
2322
410f6702
RD		 2323 INIT_WORK(&cmd->work, target_complete_ok_work);
2324 queue_work(target_completion_wq, &cmd->work);
2325 return 0;
2326 }
da0f7619 2327
4101f0a8 2328 atomic_inc(&cmd->t_fe_count);
4101f0a8 2329
c66ac9db 2330 /*
c3196f0c
CH		 2331 * If this command is not a write we can execute it right here,
2332 * for write buffers we need to notify the fabric driver first
2333 * and let it call back once the write buffers are ready.
c66ac9db 2334 */
5f41a31d 2335 target_add_to_state_list(cmd);
c3196f0c
CH		 2336 if (cmd->data_direction != DMA_TO_DEVICE) {
2337 target_execute_cmd(cmd);
2338 return 0;
2339 }
2340
2341 spin_lock_irq(&cmd->t_state_lock);
2342 cmd->t_state = TRANSPORT_WRITE_PENDING;
2343 spin_unlock_irq(&cmd->t_state_lock);
2344
2345 transport_cmd_check_stop(cmd, false);
2346
2347 ret = cmd->se_tfo->write_pending(cmd);
2348 if (ret == -EAGAIN || ret == -ENOMEM)
2349 goto queue_full;
2350
2351 if (ret < 0)
2352 return ret;
2353 return 1;
da0f7619
CH		 2354
2355out_fail:
2356 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2357 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2358 return -EINVAL;
c3196f0c
CH		 2359queue_full:
2360 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2361 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2362 transport_handle_queue_full(cmd, cmd->se_dev);
2363 return 0;
c66ac9db 2364}
a1d8b49a 2365EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2366
e057f533 2367static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2368{
f147abb4
NB		 2369 int ret;
2370
2371 ret = cmd->se_tfo->write_pending(cmd);
2372 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2373 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2374 cmd);
2375 transport_handle_queue_full(cmd, cmd->se_dev);
2376 }
07bde79a
NB		 2377}
2378
39c05f32 2379void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2380{
d14921d6 2381 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2382 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2383 transport_wait_for_tasks(cmd);
2384
35462975 2385 transport_release_cmd(cmd);
d14921d6
NB		 2386 } else {
2387 if (wait_for_tasks)
2388 transport_wait_for_tasks(cmd);
2389
c66ac9db
NB		 2390 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2391
82f1c8a4 2392 if (cmd->se_lun)
c66ac9db 2393 transport_lun_remove_cmd(cmd);
c66ac9db 2394
39c05f32 2395 transport_put_cmd(cmd);
c66ac9db
NB		 2396 }
2397}
2398EXPORT_SYMBOL(transport_generic_free_cmd);
2399
a17f091d
NB		 2400/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2401 * @se_sess: session to reference
2402 * @se_cmd: command descriptor to add
a6360785 2403 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2404 */
bc187ea6
RD		 2405static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2406 bool ack_kref)
a17f091d
NB		 2407{
2408 unsigned long flags;
bc187ea6 2409 int ret = 0;
a17f091d 2410
7481deb4 2411 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2412 /*
2413 * Add a second kref if the fabric caller is expecting to handle
2414 * fabric acknowledgement that requires two target_put_sess_cmd()
2415 * invocations before se_cmd descriptor release.
2416 */
86715569 2417 if (ack_kref == true) {
a6360785 2418 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2419 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2420 }
7481deb4 2421
a17f091d 2422 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2423 if (se_sess->sess_tearing_down) {
2424 ret = -ESHUTDOWN;
2425 goto out;
2426 }
a17f091d
NB		 2427 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2428 se_cmd->check_release = 1;
bc187ea6
RD		 2429
2430out:
a17f091d 2431 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2432 return ret;
a17f091d 2433}
a17f091d 2434
7481deb4 2435static void target_release_cmd_kref(struct kref *kref)
a17f091d 2436{
7481deb4
NB		 2437 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2438 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 2439 unsigned long flags;
2440
2441 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2442 if (list_empty(&se_cmd->se_cmd_list)) {
2443 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2444 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2445 return;
a17f091d 2446 }
a17f091d
NB		 2447 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2448 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2449 complete(&se_cmd->cmd_wait_comp);
7481deb4 2450 return;
a17f091d
NB		 2451 }
2452 list_del(&se_cmd->se_cmd_list);
2453 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2454
7481deb4
NB		 2455 se_cmd->se_tfo->release_cmd(se_cmd);
2456}
2457
2458/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2459 * @se_sess: session to reference
2460 * @se_cmd: command descriptor to drop
2461 */
2462int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2463{
2464 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2465}
2466EXPORT_SYMBOL(target_put_sess_cmd);
2467
1c7b13fe
RD		 2468/* target_sess_cmd_list_set_waiting - Flag all commands in
2469 * sess_cmd_list to complete cmd_wait_comp. Set
2470 * sess_tearing_down so no more commands are queued.
2471 * @se_sess: session to flag
a17f091d 2472 */
1c7b13fe 2473void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2474{
2475 struct se_cmd *se_cmd;
2476 unsigned long flags;
2477
a17f091d 2478 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
a17f091d 2479
1c7b13fe
RD		 2480 WARN_ON(se_sess->sess_tearing_down);
2481 se_sess->sess_tearing_down = 1;
a17f091d 2482
1c7b13fe 2483 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
a17f091d
NB		 2484 se_cmd->cmd_wait_set = 1;
2485
2486 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2487}
1c7b13fe 2488EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2489
2490/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2491 * @se_sess: session to wait for active I/O
2492 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2493 */
2494void target_wait_for_sess_cmds(
2495 struct se_session *se_sess,
2496 int wait_for_tasks)
2497{
2498 struct se_cmd *se_cmd, *tmp_cmd;
2499 bool rc = false;
2500
2501 list_for_each_entry_safe(se_cmd, tmp_cmd,
1c7b13fe 2502 &se_sess->sess_cmd_list, se_cmd_list) {
a17f091d
NB		 2503 list_del(&se_cmd->se_cmd_list);
2504
2505 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2506 " %d\n", se_cmd, se_cmd->t_state,
2507 se_cmd->se_tfo->get_cmd_state(se_cmd));
2508
2509 if (wait_for_tasks) {
2510 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2511 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2512 se_cmd->se_tfo->get_cmd_state(se_cmd));
2513
2514 rc = transport_wait_for_tasks(se_cmd);
2515
2516 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2517 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2518 se_cmd->se_tfo->get_cmd_state(se_cmd));
2519 }
2520
2521 if (!rc) {
2522 wait_for_completion(&se_cmd->cmd_wait_comp);
2523 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2524 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2525 se_cmd->se_tfo->get_cmd_state(se_cmd));
2526 }
2527
2528 se_cmd->se_tfo->release_cmd(se_cmd);
2529 }
2530}
2531EXPORT_SYMBOL(target_wait_for_sess_cmds);
2532
c66ac9db
NB		 2533/* transport_lun_wait_for_tasks():
2534 *
2535 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2536 * an struct se_lun to be successfully shutdown.
2537 */
2538static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2539{
2540 unsigned long flags;
cf572a96
CH		 2541 int ret = 0;
2542
c66ac9db
NB		 2543 /*
2544 * If the frontend has already requested this struct se_cmd to
2545 * be stopped, we can safely ignore this struct se_cmd.
2546 */
a1d8b49a 2547 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2548 if (cmd->transport_state & CMD_T_STOP) {
2549 cmd->transport_state &= ~CMD_T_LUN_STOP;
2550
2551 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2552 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2553 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2554 transport_cmd_check_stop(cmd, false);
e3d6f909 2555 return -EPERM;
c66ac9db 2556 }
7d680f3b 2557 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2558 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2559
cf572a96
CH		 2560 // XXX: audit task_flags checks.
2561 spin_lock_irqsave(&cmd->t_state_lock, flags);
2562 if ((cmd->transport_state & CMD_T_BUSY) &&
2563 (cmd->transport_state & CMD_T_SENT)) {
2564 if (!target_stop_cmd(cmd, &flags))
2565 ret++;
cf572a96 2566 }
5f41a31d 2567 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2568
785fdf70
CH		 2569 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2570 " %d\n", cmd, ret);
c66ac9db 2571 if (!ret) {
6708bb27 2572 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2573 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2574 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2575 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2576 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2577 }
c66ac9db
NB		 2578
2579 return 0;
2580}
2581
c66ac9db
NB		 2582static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2583{
2584 struct se_cmd *cmd = NULL;
2585 unsigned long lun_flags, cmd_flags;
2586 /*
2587 * Do exception processing and return CHECK_CONDITION status to the
2588 * Initiator Port.
2589 */
2590 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2591 while (!list_empty(&lun->lun_cmd_list)) {
2592 cmd = list_first_entry(&lun->lun_cmd_list,
2593 struct se_cmd, se_lun_node);
3d26fea0 2594 list_del_init(&cmd->se_lun_node);
5951146d 2595
a1d8b49a 2596 spin_lock(&cmd->t_state_lock);
6708bb27 2597 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2598 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2599 cmd->se_lun->unpacked_lun,
2600 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2601 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2602 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2603
2604 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2605
6708bb27
AG		 2606 if (!cmd->se_lun) {
2607 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2608 cmd->se_tfo->get_task_tag(cmd),
2609 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2610 BUG();
2611 }
2612 /*
2613 * If the Storage engine still owns the iscsi_cmd_t, determine
2614 * and/or stop its context.
2615 */
6708bb27 2616 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2617 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2618 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2619
e3d6f909 2620 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2621 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2622 continue;
2623 }
2624
6708bb27 2625 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2626 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2627 cmd->se_lun->unpacked_lun,
2628 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2629
a1d8b49a 2630 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2631 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2632 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2633 goto check_cond;
2634 }
7d680f3b 2635 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2636 target_remove_from_state_list(cmd);
a1d8b49a 2637 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2638
c66ac9db
NB		 2639 /*
2640 * The Storage engine stopped this struct se_cmd before it was
2641 * send to the fabric frontend for delivery back to the
2642 * Initiator Node. Return this SCSI CDB back with an
2643 * CHECK_CONDITION status.
2644 */
2645check_cond:
2646 transport_send_check_condition_and_sense(cmd,
2647 TCM_NON_EXISTENT_LUN, 0);
2648 /*
2649 * If the fabric frontend is waiting for this iscsi_cmd_t to
2650 * be released, notify the waiting thread now that LU has
2651 * finished accessing it.
2652 */
a1d8b49a 2653 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2654 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2655 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2656 " struct se_cmd: %p ITT: 0x%08x\n",
2657 lun->unpacked_lun,
e3d6f909 2658 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2659
a1d8b49a 2660 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2661 cmd_flags);
f7113a47 2662 transport_cmd_check_stop(cmd, false);
a1d8b49a 2663 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2664 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2665 continue;
2666 }
6708bb27 2667 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2668 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2669
a1d8b49a 2670 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2671 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2672 }
2673 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2674}
2675
2676static int transport_clear_lun_thread(void *p)
2677{
8359cf43 2678 struct se_lun *lun = p;
c66ac9db
NB		 2679
2680 __transport_clear_lun_from_sessions(lun);
2681 complete(&lun->lun_shutdown_comp);
2682
2683 return 0;
2684}
2685
2686int transport_clear_lun_from_sessions(struct se_lun *lun)
2687{
2688 struct task_struct *kt;
2689
5951146d 2690 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2691 "tcm_cl_%u", lun->unpacked_lun);
2692 if (IS_ERR(kt)) {
6708bb27 2693 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2694 return PTR_ERR(kt);
c66ac9db
NB		 2695 }
2696 wait_for_completion(&lun->lun_shutdown_comp);
2697
2698 return 0;
2699}
2700
d14921d6
NB		 2701/**
2702 * transport_wait_for_tasks - wait for completion to occur
2703 * @cmd: command to wait
c66ac9db 2704 *
d14921d6
NB		 2705 * Called from frontend fabric context to wait for storage engine
2706 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2707 */
a17f091d 2708bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2709{
2710 unsigned long flags;
2711
a1d8b49a 2712 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2713 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2714 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2715 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2716 return false;
d14921d6 2717 }
cb4f4d3c 2718
c8e31f26
AG		 2719 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2720 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2721 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2722 return false;
d14921d6 2723 }
c66ac9db
NB		 2724 /*
2725 * If we are already stopped due to an external event (ie: LUN shutdown)
2726 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2727 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2728 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2729 * has completed its operation on the struct se_cmd.
2730 */
7d680f3b 2731 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2732 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2733 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2734 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2735 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2736 /*
2737 * There is a special case for WRITES where a FE exception +
2738 * LUN shutdown means ConfigFS context is still sleeping on
2739 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2740 * We go ahead and up transport_lun_stop_comp just to be sure
2741 * here.
2742 */
a1d8b49a
AG		 2743 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2744 complete(&cmd->transport_lun_stop_comp);
2745 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2746 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2747
cf572a96 2748 target_remove_from_state_list(cmd);
c66ac9db
NB		 2749 /*
2750 * At this point, the frontend who was the originator of this
2751 * struct se_cmd, now owns the structure and can be released through
2752 * normal means below.
2753 */
6708bb27 2754 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2755 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2756 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2757 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2758
7d680f3b 2759 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2760 }
7d680f3b 2761
3d28934a 2762 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2763 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2764 return false;
d14921d6 2765 }
c66ac9db 2766
7d680f3b 2767 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2768
6708bb27 2769 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2770 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2771 cmd, cmd->se_tfo->get_task_tag(cmd),
2772 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2773
a1d8b49a 2774 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2775
a1d8b49a 2776 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2777
a1d8b49a 2778 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2779 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2780
6708bb27 2781 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 2782 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2783 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2784
d14921d6 2785 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2786
2787 return true;
c66ac9db 2788}
d14921d6 2789EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2790
2791static int transport_get_sense_codes(
2792 struct se_cmd *cmd,
2793 u8 *asc,
2794 u8 *ascq)
2795{
2796 *asc = cmd->scsi_asc;
2797 *ascq = cmd->scsi_ascq;
2798
2799 return 0;
2800}
2801
2802static int transport_set_sense_codes(
2803 struct se_cmd *cmd,
2804 u8 asc,
2805 u8 ascq)
2806{
2807 cmd->scsi_asc = asc;
2808 cmd->scsi_ascq = ascq;
2809
2810 return 0;
2811}
2812
2813int transport_send_check_condition_and_sense(
2814 struct se_cmd *cmd,
2815 u8 reason,
2816 int from_transport)
2817{
2818 unsigned char *buffer = cmd->sense_buffer;
2819 unsigned long flags;
2820 int offset;
2821 u8 asc = 0, ascq = 0;
2822
a1d8b49a 2823 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2824 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2825 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2826 return 0;
2827 }
2828 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2829 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2830
2831 if (!reason && from_transport)
2832 goto after_reason;
2833
2834 if (!from_transport)
2835 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2836 /*
2837 * Data Segment and SenseLength of the fabric response PDU.
2838 *
2839 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2840 * from include/scsi/scsi_cmnd.h
2841 */
e3d6f909 2842 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2843 TRANSPORT_SENSE_BUFFER);
2844 /*
2845 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2846 * SENSE KEY values from include/scsi/scsi.h
2847 */
2848 switch (reason) {
2849 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 2850 /* CURRENT ERROR */
2851 buffer[offset] = 0x70;
895f3022 2852 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 2853 /* ILLEGAL REQUEST */
2854 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2855 /* LOGICAL UNIT NOT SUPPORTED */
2856 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
2857 break;
c66ac9db
NB		 2858 case TCM_UNSUPPORTED_SCSI_OPCODE:
2859 case TCM_SECTOR_COUNT_TOO_MANY:
2860 /* CURRENT ERROR */
2861 buffer[offset] = 0x70;
895f3022 2862 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2863 /* ILLEGAL REQUEST */
2864 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2865 /* INVALID COMMAND OPERATION CODE */
2866 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
2867 break;
2868 case TCM_UNKNOWN_MODE_PAGE:
2869 /* CURRENT ERROR */
2870 buffer[offset] = 0x70;
895f3022 2871 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2872 /* ILLEGAL REQUEST */
2873 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2874 /* INVALID FIELD IN CDB */
2875 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2876 break;
2877 case TCM_CHECK_CONDITION_ABORT_CMD:
2878 /* CURRENT ERROR */
2879 buffer[offset] = 0x70;
895f3022 2880 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2881 /* ABORTED COMMAND */
2882 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2883 /* BUS DEVICE RESET FUNCTION OCCURRED */
2884 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
2885 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
2886 break;
2887 case TCM_INCORRECT_AMOUNT_OF_DATA:
2888 /* CURRENT ERROR */
2889 buffer[offset] = 0x70;
895f3022 2890 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2891 /* ABORTED COMMAND */
2892 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2893 /* WRITE ERROR */
2894 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2895 /* NOT ENOUGH UNSOLICITED DATA */
2896 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
2897 break;
2898 case TCM_INVALID_CDB_FIELD:
2899 /* CURRENT ERROR */
2900 buffer[offset] = 0x70;
895f3022 2901 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 2902 /* ILLEGAL REQUEST */
2903 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 2904 /* INVALID FIELD IN CDB */
2905 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2906 break;
2907 case TCM_INVALID_PARAMETER_LIST:
2908 /* CURRENT ERROR */
2909 buffer[offset] = 0x70;
895f3022 2910 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 2911 /* ILLEGAL REQUEST */
2912 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 2913 /* INVALID FIELD IN PARAMETER LIST */
2914 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
2915 break;
2916 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2917 /* CURRENT ERROR */
2918 buffer[offset] = 0x70;
895f3022 2919 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2920 /* ABORTED COMMAND */
2921 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2922 /* WRITE ERROR */
2923 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2924 /* UNEXPECTED_UNSOLICITED_DATA */
2925 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
2926 break;
2927 case TCM_SERVICE_CRC_ERROR:
2928 /* CURRENT ERROR */
2929 buffer[offset] = 0x70;
895f3022 2930 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2931 /* ABORTED COMMAND */
2932 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2933 /* PROTOCOL SERVICE CRC ERROR */
2934 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
2935 /* N/A */
2936 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
2937 break;
2938 case TCM_SNACK_REJECTED:
2939 /* CURRENT ERROR */
2940 buffer[offset] = 0x70;
895f3022 2941 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2942 /* ABORTED COMMAND */
2943 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2944 /* READ ERROR */
2945 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
2946 /* FAILED RETRANSMISSION REQUEST */
2947 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
2948 break;
2949 case TCM_WRITE_PROTECTED:
2950 /* CURRENT ERROR */
2951 buffer[offset] = 0x70;
895f3022 2952 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2953 /* DATA PROTECT */
2954 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2955 /* WRITE PROTECTED */
2956 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
2957 break;
e2397c70
RD		 2958 case TCM_ADDRESS_OUT_OF_RANGE:
2959 /* CURRENT ERROR */
2960 buffer[offset] = 0x70;
2961 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2962 /* ILLEGAL REQUEST */
2963 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2964 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2965 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21;
2966 break;
c66ac9db
NB		 2967 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2968 /* CURRENT ERROR */
2969 buffer[offset] = 0x70;
895f3022 2970 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2971 /* UNIT ATTENTION */
2972 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2973 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2974 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2975 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2976 break;
2977 case TCM_CHECK_CONDITION_NOT_READY:
2978 /* CURRENT ERROR */
2979 buffer[offset] = 0x70;
895f3022 2980 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2981 /* Not Ready */
2982 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
2983 transport_get_sense_codes(cmd, &asc, &ascq);
2984 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2985 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2986 break;
2987 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2988 default:
2989 /* CURRENT ERROR */
2990 buffer[offset] = 0x70;
895f3022 2991 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2992 /* ILLEGAL REQUEST */
2993 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2994 /* LOGICAL UNIT COMMUNICATION FAILURE */
2995 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
2996 break;
2997 }
2998 /*
2999 * This code uses linux/include/scsi/scsi.h SAM status codes!
3000 */
3001 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3002 /*
3003 * Automatically padded, this value is encoded in the fabric's
3004 * data_length response PDU containing the SCSI defined sense data.
3005 */
3006 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
3007
3008after_reason:
07bde79a 3009 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3010}
3011EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3012
3013int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3014{
3015 int ret = 0;
3016
7d680f3b 3017 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 3018 if (!send_status ||
c66ac9db
NB		 3019 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3020 return 1;
8b1e1244 3021
6708bb27 3022 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 3023 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 3024 cmd->t_task_cdb[0],
e3d6f909 3025 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3026
c66ac9db 3027 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 3028 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3029 ret = 1;
3030 }
3031 return ret;
3032}
3033EXPORT_SYMBOL(transport_check_aborted_status);
3034
3035void transport_send_task_abort(struct se_cmd *cmd)
3036{
c252f003
NB		 3037 unsigned long flags;
3038
3039 spin_lock_irqsave(&cmd->t_state_lock, flags);
3040 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3041 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3042 return;
3043 }
3044 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3045
c66ac9db
NB		 3046 /*
3047 * If there are still expected incoming fabric WRITEs, we wait
3048 * until until they have completed before sending a TASK_ABORTED
3049 * response. This response with TASK_ABORTED status will be
3050 * queued back to fabric module by transport_check_aborted_status().
3051 */
3052 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3053 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 3054 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 3055 smp_mb__after_atomic_inc();
c66ac9db
NB		 3056 }
3057 }
3058 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3059
6708bb27 3060 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 3061 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 3062 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3063
e3d6f909 3064 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3065}
3066
af877292 3067static void target_tmr_work(struct work_struct *work)
c66ac9db 3068{
af877292 3069 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3070 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3071 struct se_tmr_req *tmr = cmd->se_tmr_req;
3072 int ret;
3073
3074 switch (tmr->function) {
5c6cd613 3075 case TMR_ABORT_TASK:
3d28934a 3076 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3077 break;
5c6cd613
NB		 3078 case TMR_ABORT_TASK_SET:
3079 case TMR_CLEAR_ACA:
3080 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3081 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3082 break;
5c6cd613 3083 case TMR_LUN_RESET:
c66ac9db
NB		 3084 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3085 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3086 TMR_FUNCTION_REJECTED;
3087 break;
5c6cd613 3088 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3089 tmr->response = TMR_FUNCTION_REJECTED;
3090 break;
5c6cd613 3091 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3092 tmr->response = TMR_FUNCTION_REJECTED;
3093 break;
c66ac9db 3094 default:
6708bb27 3095 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3096 tmr->function);
3097 tmr->response = TMR_FUNCTION_REJECTED;
3098 break;
3099 }
3100
3101 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 3102 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3103
b7b8bef7 3104 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3105}
3106
af877292
CH		 3107int transport_generic_handle_tmr(
3108 struct se_cmd *cmd)
c66ac9db 3109{
af877292
CH		 3110 INIT_WORK(&cmd->work, target_tmr_work);
3111 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3112 return 0;
3113}
af877292 3114EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux kernel - Deliverables
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