projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
target: Make unnecessarily global se_dev_align_max_sectors() static
[linux-2.6-block.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
5787cacd 570void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 571{
42bf829e 572 struct se_device *dev = cmd->se_dev;
5787cacd 573 int success = scsi_status == GOOD;
c66ac9db 574 unsigned long flags;
c66ac9db 575
5787cacd
CH		 576 cmd->scsi_status = scsi_status;
577
578
a1d8b49a 579 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 580 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 581
c66ac9db 582 if (dev && dev->transport->transport_complete) {
5787cacd
CH		 583 if (dev->transport->transport_complete(cmd,
584 cmd->t_data_sg) != 0) {
c66ac9db 585 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
c66ac9db
NB		 586 success = 1;
587 }
588 }
589
590 /*
5787cacd 591 * See if we are waiting to complete for an exception condition.
c66ac9db 592 */
cf572a96 593 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 594 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 595 complete(&cmd->task_stop_comp);
c66ac9db
NB		 596 return;
597 }
2235007c
CH		 598
599 if (!success)
7d680f3b 600 cmd->transport_state |= CMD_T_FAILED;
2235007c 601
3d28934a
NB		 602 /*
603 * Check for case where an explict ABORT_TASK has been received
604 * and transport_wait_for_tasks() will be waiting for completion..
605 */
606 if (cmd->transport_state & CMD_T_ABORTED &&
607 cmd->transport_state & CMD_T_STOP) {
608 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
609 complete(&cmd->t_transport_stop_comp);
610 return;
611 } else if (cmd->transport_state & CMD_T_FAILED) {
41e16e98 612 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 613 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 614 } else {
35e0e757 615 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 616 }
35e0e757 617
35e0e757 618 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 619 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 620 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 621
35e0e757 622 queue_work(target_completion_wq, &cmd->work);
c66ac9db 623}
6bb35e00
CH		 624EXPORT_SYMBOL(target_complete_cmd);
625
cf572a96 626static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 627{
cf572a96
CH		 628 struct se_device *dev = cmd->se_dev;
629 unsigned long flags;
c66ac9db 630
cf572a96
CH		 631 spin_lock_irqsave(&dev->execute_task_lock, flags);
632 if (!cmd->state_active) {
633 list_add_tail(&cmd->state_list, &dev->state_list);
634 cmd->state_active = true;
c66ac9db 635 }
cf572a96 636 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 637}
638
07bde79a 639/*
f147abb4 640 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 641 */
7a6f0a1e
CH		 642static void transport_write_pending_qf(struct se_cmd *cmd);
643static void transport_complete_qf(struct se_cmd *cmd);
07bde79a
NB		 644
645static void target_qf_do_work(struct work_struct *work)
646{
647 struct se_device *dev = container_of(work, struct se_device,
648 qf_work_queue);
bcac364a 649 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 650 struct se_cmd *cmd, *cmd_tmp;
651
652 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 653 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
654 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 655
bcac364a 656 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 657 list_del(&cmd->se_qf_node);
658 atomic_dec(&dev->dev_qf_count);
659 smp_mb__after_atomic_dec();
07bde79a 660
6708bb27 661 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 662 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 663 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 664 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
665 : "UNKNOWN");
f7a5cc0b 666
7a6f0a1e
CH		 667 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
668 transport_write_pending_qf(cmd);
669 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
670 transport_complete_qf(cmd);
07bde79a 671 }
07bde79a
NB		 672}
673
c66ac9db
NB		 674unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
675{
676 switch (cmd->data_direction) {
677 case DMA_NONE:
678 return "NONE";
679 case DMA_FROM_DEVICE:
680 return "READ";
681 case DMA_TO_DEVICE:
682 return "WRITE";
683 case DMA_BIDIRECTIONAL:
684 return "BIDI";
685 default:
686 break;
687 }
688
689 return "UNKNOWN";
690}
691
692void transport_dump_dev_state(
693 struct se_device *dev,
694 char *b,
695 int *bl)
696{
697 *bl += sprintf(b + *bl, "Status: ");
698 switch (dev->dev_status) {
699 case TRANSPORT_DEVICE_ACTIVATED:
700 *bl += sprintf(b + *bl, "ACTIVATED");
701 break;
702 case TRANSPORT_DEVICE_DEACTIVATED:
703 *bl += sprintf(b + *bl, "DEACTIVATED");
704 break;
705 case TRANSPORT_DEVICE_SHUTDOWN:
706 *bl += sprintf(b + *bl, "SHUTDOWN");
707 break;
708 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
709 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
710 *bl += sprintf(b + *bl, "OFFLINE");
711 break;
712 default:
713 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
714 break;
715 }
716
5f41a31d 717 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd
NB		 718 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
719 dev->se_sub_dev->se_dev_attrib.block_size,
720 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
c66ac9db
NB		 721 *bl += sprintf(b + *bl, " ");
722}
723
c66ac9db
NB		 724void transport_dump_vpd_proto_id(
725 struct t10_vpd *vpd,
726 unsigned char *p_buf,
727 int p_buf_len)
728{
729 unsigned char buf[VPD_TMP_BUF_SIZE];
730 int len;
731
732 memset(buf, 0, VPD_TMP_BUF_SIZE);
733 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
734
735 switch (vpd->protocol_identifier) {
736 case 0x00:
737 sprintf(buf+len, "Fibre Channel\n");
738 break;
739 case 0x10:
740 sprintf(buf+len, "Parallel SCSI\n");
741 break;
742 case 0x20:
743 sprintf(buf+len, "SSA\n");
744 break;
745 case 0x30:
746 sprintf(buf+len, "IEEE 1394\n");
747 break;
748 case 0x40:
749 sprintf(buf+len, "SCSI Remote Direct Memory Access"
750 " Protocol\n");
751 break;
752 case 0x50:
753 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
754 break;
755 case 0x60:
756 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
757 break;
758 case 0x70:
759 sprintf(buf+len, "Automation/Drive Interface Transport"
760 " Protocol\n");
761 break;
762 case 0x80:
763 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
764 break;
765 default:
766 sprintf(buf+len, "Unknown 0x%02x\n",
767 vpd->protocol_identifier);
768 break;
769 }
770
771 if (p_buf)
772 strncpy(p_buf, buf, p_buf_len);
773 else
6708bb27 774 pr_debug("%s", buf);
c66ac9db
NB		 775}
776
777void
778transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
779{
780 /*
781 * Check if the Protocol Identifier Valid (PIV) bit is set..
782 *
783 * from spc3r23.pdf section 7.5.1
784 */
785 if (page_83[1] & 0x80) {
786 vpd->protocol_identifier = (page_83[0] & 0xf0);
787 vpd->protocol_identifier_set = 1;
788 transport_dump_vpd_proto_id(vpd, NULL, 0);
789 }
790}
791EXPORT_SYMBOL(transport_set_vpd_proto_id);
792
793int transport_dump_vpd_assoc(
794 struct t10_vpd *vpd,
795 unsigned char *p_buf,
796 int p_buf_len)
797{
798 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 799 int ret = 0;
800 int len;
c66ac9db
NB		 801
802 memset(buf, 0, VPD_TMP_BUF_SIZE);
803 len = sprintf(buf, "T10 VPD Identifier Association: ");
804
805 switch (vpd->association) {
806 case 0x00:
807 sprintf(buf+len, "addressed logical unit\n");
808 break;
809 case 0x10:
810 sprintf(buf+len, "target port\n");
811 break;
812 case 0x20:
813 sprintf(buf+len, "SCSI target device\n");
814 break;
815 default:
816 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 817 ret = -EINVAL;
c66ac9db
NB		 818 break;
819 }
820
821 if (p_buf)
822 strncpy(p_buf, buf, p_buf_len);
823 else
6708bb27 824 pr_debug("%s", buf);
c66ac9db
NB		 825
826 return ret;
827}
828
829int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
830{
831 /*
832 * The VPD identification association..
833 *
834 * from spc3r23.pdf Section 7.6.3.1 Table 297
835 */
836 vpd->association = (page_83[1] & 0x30);
837 return transport_dump_vpd_assoc(vpd, NULL, 0);
838}
839EXPORT_SYMBOL(transport_set_vpd_assoc);
840
841int transport_dump_vpd_ident_type(
842 struct t10_vpd *vpd,
843 unsigned char *p_buf,
844 int p_buf_len)
845{
846 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 847 int ret = 0;
848 int len;
c66ac9db
NB		 849
850 memset(buf, 0, VPD_TMP_BUF_SIZE);
851 len = sprintf(buf, "T10 VPD Identifier Type: ");
852
853 switch (vpd->device_identifier_type) {
854 case 0x00:
855 sprintf(buf+len, "Vendor specific\n");
856 break;
857 case 0x01:
858 sprintf(buf+len, "T10 Vendor ID based\n");
859 break;
860 case 0x02:
861 sprintf(buf+len, "EUI-64 based\n");
862 break;
863 case 0x03:
864 sprintf(buf+len, "NAA\n");
865 break;
866 case 0x04:
867 sprintf(buf+len, "Relative target port identifier\n");
868 break;
869 case 0x08:
870 sprintf(buf+len, "SCSI name string\n");
871 break;
872 default:
873 sprintf(buf+len, "Unsupported: 0x%02x\n",
874 vpd->device_identifier_type);
e3d6f909 875 ret = -EINVAL;
c66ac9db
NB		 876 break;
877 }
878
e3d6f909
AG		 879 if (p_buf) {
880 if (p_buf_len < strlen(buf)+1)
881 return -EINVAL;
c66ac9db 882 strncpy(p_buf, buf, p_buf_len);
e3d6f909 883 } else {
6708bb27 884 pr_debug("%s", buf);
e3d6f909 885 }
c66ac9db
NB		 886
887 return ret;
888}
889
890int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
891{
892 /*
893 * The VPD identifier type..
894 *
895 * from spc3r23.pdf Section 7.6.3.1 Table 298
896 */
897 vpd->device_identifier_type = (page_83[1] & 0x0f);
898 return transport_dump_vpd_ident_type(vpd, NULL, 0);
899}
900EXPORT_SYMBOL(transport_set_vpd_ident_type);
901
902int transport_dump_vpd_ident(
903 struct t10_vpd *vpd,
904 unsigned char *p_buf,
905 int p_buf_len)
906{
907 unsigned char buf[VPD_TMP_BUF_SIZE];
908 int ret = 0;
909
910 memset(buf, 0, VPD_TMP_BUF_SIZE);
911
912 switch (vpd->device_identifier_code_set) {
913 case 0x01: /* Binary */
914 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
915 &vpd->device_identifier[0]);
916 break;
917 case 0x02: /* ASCII */
918 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
919 &vpd->device_identifier[0]);
920 break;
921 case 0x03: /* UTF-8 */
922 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
923 &vpd->device_identifier[0]);
924 break;
925 default:
926 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
927 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 928 ret = -EINVAL;
c66ac9db
NB		 929 break;
930 }
931
932 if (p_buf)
933 strncpy(p_buf, buf, p_buf_len);
934 else
6708bb27 935 pr_debug("%s", buf);
c66ac9db
NB		 936
937 return ret;
938}
939
940int
941transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
942{
943 static const char hex_str[] = "0123456789abcdef";
944 int j = 0, i = 4; /* offset to start of the identifer */
945
946 /*
947 * The VPD Code Set (encoding)
948 *
949 * from spc3r23.pdf Section 7.6.3.1 Table 296
950 */
951 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
952 switch (vpd->device_identifier_code_set) {
953 case 0x01: /* Binary */
954 vpd->device_identifier[j++] =
955 hex_str[vpd->device_identifier_type];
956 while (i < (4 + page_83[3])) {
957 vpd->device_identifier[j++] =
958 hex_str[(page_83[i] & 0xf0) >> 4];
959 vpd->device_identifier[j++] =
960 hex_str[page_83[i] & 0x0f];
961 i++;
962 }
963 break;
964 case 0x02: /* ASCII */
965 case 0x03: /* UTF-8 */
966 while (i < (4 + page_83[3]))
967 vpd->device_identifier[j++] = page_83[i++];
968 break;
969 default:
970 break;
971 }
972
973 return transport_dump_vpd_ident(vpd, NULL, 0);
974}
975EXPORT_SYMBOL(transport_set_vpd_ident);
976
977static void core_setup_task_attr_emulation(struct se_device *dev)
978{
979 /*
980 * If this device is from Target_Core_Mod/pSCSI, disable the
981 * SAM Task Attribute emulation.
982 *
983 * This is currently not available in upsream Linux/SCSI Target
984 * mode code, and is assumed to be disabled while using TCM/pSCSI.
985 */
e3d6f909 986 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 987 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
988 return;
989 }
990
991 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 992 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 993 " device\n", dev->transport->name,
994 dev->transport->get_device_rev(dev));
c66ac9db
NB		 995}
996
997static void scsi_dump_inquiry(struct se_device *dev)
998{
e3d6f909 999 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1000 char buf[17];
c66ac9db
NB		 1001 int i, device_type;
1002 /*
1003 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1004 */
c66ac9db
NB		 1005 for (i = 0; i < 8; i++)
1006 if (wwn->vendor[i] >= 0x20)
e59a41b6 1007 buf[i] = wwn->vendor[i];
c66ac9db 1008 else
e59a41b6
SAS		 1009 buf[i] = ' ';
1010 buf[i] = '\0';
1011 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1012
c66ac9db
NB		 1013 for (i = 0; i < 16; i++)
1014 if (wwn->model[i] >= 0x20)
e59a41b6 1015 buf[i] = wwn->model[i];
c66ac9db 1016 else
e59a41b6
SAS		 1017 buf[i] = ' ';
1018 buf[i] = '\0';
1019 pr_debug(" Model: %s\n", buf);
c66ac9db 1020
c66ac9db
NB		 1021 for (i = 0; i < 4; i++)
1022 if (wwn->revision[i] >= 0x20)
e59a41b6 1023 buf[i] = wwn->revision[i];
c66ac9db 1024 else
e59a41b6
SAS		 1025 buf[i] = ' ';
1026 buf[i] = '\0';
1027 pr_debug(" Revision: %s\n", buf);
c66ac9db 1028
e3d6f909 1029 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1030 pr_debug(" Type: %s ", scsi_device_type(device_type));
1031 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1032 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1033}
1034
1035struct se_device *transport_add_device_to_core_hba(
1036 struct se_hba *hba,
1037 struct se_subsystem_api *transport,
1038 struct se_subsystem_dev *se_dev,
1039 u32 device_flags,
1040 void *transport_dev,
1041 struct se_dev_limits *dev_limits,
1042 const char *inquiry_prod,
1043 const char *inquiry_rev)
1044{
12a18bdc 1045 int force_pt;
c66ac9db
NB		 1046 struct se_device *dev;
1047
1048 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1049 if (!dev) {
1050 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1051 return NULL;
1052 }
c66ac9db
NB		 1053
1054 dev->dev_flags = device_flags;
1055 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1056 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1057 dev->se_hba = hba;
1058 dev->se_sub_dev = se_dev;
1059 dev->transport = transport;
c66ac9db
NB		 1060 INIT_LIST_HEAD(&dev->dev_list);
1061 INIT_LIST_HEAD(&dev->dev_sep_list);
1062 INIT_LIST_HEAD(&dev->dev_tmr_list);
c66ac9db 1063 INIT_LIST_HEAD(&dev->delayed_cmd_list);
cf572a96 1064 INIT_LIST_HEAD(&dev->state_list);
07bde79a 1065 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1066 spin_lock_init(&dev->execute_task_lock);
1067 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1068 spin_lock_init(&dev->dev_reservation_lock);
1069 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1070 spin_lock_init(&dev->se_port_lock);
1071 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1072 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1073 atomic_set(&dev->dev_ordered_id, 0);
1074
1075 se_dev_set_default_attribs(dev, dev_limits);
1076
1077 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1078 dev->creation_time = get_jiffies_64();
1079 spin_lock_init(&dev->stats_lock);
1080
1081 spin_lock(&hba->device_lock);
1082 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1083 hba->dev_count++;
1084 spin_unlock(&hba->device_lock);
1085 /*
1086 * Setup the SAM Task Attribute emulation for struct se_device
1087 */
1088 core_setup_task_attr_emulation(dev);
1089 /*
1090 * Force PR and ALUA passthrough emulation with internal object use.
1091 */
1092 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1093 /*
1094 * Setup the Reservations infrastructure for struct se_device
1095 */
1096 core_setup_reservations(dev, force_pt);
1097 /*
1098 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1099 */
1100 if (core_setup_alua(dev, force_pt) < 0)
1101 goto out;
1102
1103 /*
1104 * Startup the struct se_device processing thread
1105 */
af877292
CH		 1106 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1107 dev->transport->name);
1108 if (!dev->tmr_wq) {
1109 pr_err("Unable to create tmr workqueue for %s\n",
e3d6f909 1110 dev->transport->name);
c66ac9db
NB		 1111 goto out;
1112 }
07bde79a
NB		 1113 /*
1114 * Setup work_queue for QUEUE_FULL
1115 */
1116 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1117 /*
1118 * Preload the initial INQUIRY const values if we are doing
1119 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1120 * passthrough because this is being provided by the backend LLD.
1121 * This is required so that transport_get_inquiry() copies these
1122 * originals once back into DEV_T10_WWN(dev) for the virtual device
1123 * setup.
1124 */
e3d6f909 1125 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1126 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1127 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1128 " INQUIRY consts\n");
1129 goto out;
1130 }
1131
e3d6f909
AG		 1132 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1133 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1134 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1135 }
1136 scsi_dump_inquiry(dev);
1137
12a18bdc 1138 return dev;
c66ac9db 1139out:
af877292 1140 destroy_workqueue(dev->tmr_wq);
c66ac9db
NB		 1141
1142 spin_lock(&hba->device_lock);
1143 list_del(&dev->dev_list);
1144 hba->dev_count--;
1145 spin_unlock(&hba->device_lock);
1146
1147 se_release_vpd_for_dev(dev);
1148
c66ac9db
NB		 1149 kfree(dev);
1150
1151 return NULL;
1152}
1153EXPORT_SYMBOL(transport_add_device_to_core_hba);
1154
1fd032ee 1155int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1156{
1157 struct se_device *dev = cmd->se_dev;
1158
1159 if (cmd->unknown_data_length) {
1160 cmd->data_length = size;
1161 } else if (size != cmd->data_length) {
1162 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1163 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1164 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1165 cmd->data_length, size, cmd->t_task_cdb[0]);
1166
1167 cmd->cmd_spdtl = size;
1168
1169 if (cmd->data_direction == DMA_TO_DEVICE) {
1170 pr_err("Rejecting underflow/overflow"
1171 " WRITE data\n");
1172 goto out_invalid_cdb_field;
1173 }
1174 /*
1175 * Reject READ_* or WRITE_* with overflow/underflow for
1176 * type SCF_SCSI_DATA_CDB.
1177 */
1178 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
1179 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1180 " CDB on non 512-byte sector setup subsystem"
1181 " plugin: %s\n", dev->transport->name);
1182 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1183 goto out_invalid_cdb_field;
1184 }
1185
1186 if (size > cmd->data_length) {
1187 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1188 cmd->residual_count = (size - cmd->data_length);
1189 } else {
1190 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1191 cmd->residual_count = (cmd->data_length - size);
1192 }
1193 cmd->data_length = size;
1194 }
1195
1196 return 0;
1197
1198out_invalid_cdb_field:
1199 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1200 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1201 return -EINVAL;
1202}
1203
c66ac9db
NB		 1204/*
1205 * Used by fabric modules containing a local struct se_cmd within their
1206 * fabric dependent per I/O descriptor.
1207 */
1208void transport_init_se_cmd(
1209 struct se_cmd *cmd,
1210 struct target_core_fabric_ops *tfo,
1211 struct se_session *se_sess,
1212 u32 data_length,
1213 int data_direction,
1214 int task_attr,
1215 unsigned char *sense_buffer)
1216{
5951146d
AG		 1217 INIT_LIST_HEAD(&cmd->se_lun_node);
1218 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1219 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1220 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1221 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1222 init_completion(&cmd->transport_lun_fe_stop_comp);
1223 init_completion(&cmd->transport_lun_stop_comp);
1224 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1225 init_completion(&cmd->cmd_wait_comp);
cf572a96 1226 init_completion(&cmd->task_stop_comp);
a1d8b49a 1227 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1228 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1229
1230 cmd->se_tfo = tfo;
1231 cmd->se_sess = se_sess;
1232 cmd->data_length = data_length;
1233 cmd->data_direction = data_direction;
1234 cmd->sam_task_attr = task_attr;
1235 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1236
1237 cmd->state_active = false;
c66ac9db
NB		 1238}
1239EXPORT_SYMBOL(transport_init_se_cmd);
1240
1241static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1242{
1243 /*
1244 * Check if SAM Task Attribute emulation is enabled for this
1245 * struct se_device storage object
1246 */
5951146d 1247 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1248 return 0;
1249
e66ecd50 1250 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1251 pr_debug("SAM Task Attribute ACA"
c66ac9db 1252 " emulation is not supported\n");
e3d6f909 1253 return -EINVAL;
c66ac9db
NB		 1254 }
1255 /*
1256 * Used to determine when ORDERED commands should go from
1257 * Dormant to Active status.
1258 */
5951146d 1259 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1260 smp_mb__after_atomic_inc();
6708bb27 1261 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1262 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1263 cmd->se_dev->transport->name);
c66ac9db
NB		 1264 return 0;
1265}
1266
a12f41f8 1267/* target_setup_cmd_from_cdb():
c66ac9db
NB		 1268 *
1269 * Called from fabric RX Thread.
1270 */
a12f41f8 1271int target_setup_cmd_from_cdb(
c66ac9db
NB		 1272 struct se_cmd *cmd,
1273 unsigned char *cdb)
1274{
cb4f4d3c
CH		 1275 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1276 u32 pr_reg_type = 0;
1277 u8 alua_ascq = 0;
1278 unsigned long flags;
c66ac9db
NB		 1279 int ret;
1280
c66ac9db
NB		 1281 /*
1282 * Ensure that the received CDB is less than the max (252 + 8) bytes
1283 * for VARIABLE_LENGTH_CMD
1284 */
1285 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1286 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1287 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1288 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1289 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1290 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1291 return -EINVAL;
c66ac9db
NB		 1292 }
1293 /*
1294 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1295 * allocate the additional extended CDB buffer now.. Otherwise
1296 * setup the pointer from __t_task_cdb to t_task_cdb.
1297 */
a1d8b49a
AG		 1298 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1299 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1300 GFP_KERNEL);
6708bb27
AG		 1301 if (!cmd->t_task_cdb) {
1302 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1303 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1304 scsi_command_size(cdb),
a1d8b49a 1305 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1306 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1307 cmd->scsi_sense_reason =
1308 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1309 return -ENOMEM;
c66ac9db
NB		 1310 }
1311 } else
a1d8b49a 1312 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1313 /*
a1d8b49a 1314 * Copy the original CDB into cmd->
c66ac9db 1315 */
a1d8b49a 1316 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1317
1318 /*
1319 * Check for an existing UNIT ATTENTION condition
1320 */
1321 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1322 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1323 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1324 return -EINVAL;
1325 }
1326
1327 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1328 if (ret != 0) {
1329 /*
1330 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1331 * The ALUA additional sense code qualifier (ASCQ) is determined
1332 * by the ALUA primary or secondary access state..
1333 */
1334 if (ret > 0) {
1335 pr_debug("[%s]: ALUA TG Port not available, "
1336 "SenseKey: NOT_READY, ASC/ASCQ: "
1337 "0x04/0x%02x\n",
1338 cmd->se_tfo->get_fabric_name(), alua_ascq);
1339
1340 transport_set_sense_codes(cmd, 0x04, alua_ascq);
1341 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1342 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1343 return -EINVAL;
1344 }
1345 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1346 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1347 return -EINVAL;
1348 }
1349
1350 /*
1351 * Check status for SPC-3 Persistent Reservations
1352 */
1353 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1354 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1355 cmd, cdb, pr_reg_type) != 0) {
1356 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1357 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1358 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1359 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1360 return -EBUSY;
1361 }
1362 /*
1363 * This means the CDB is allowed for the SCSI Initiator port
1364 * when said port is *NOT* holding the legacy SPC-2 or
1365 * SPC-3 Persistent Reservation.
1366 */
1367 }
1368
1fd032ee 1369 ret = cmd->se_dev->transport->parse_cdb(cmd);
c66ac9db
NB		 1370 if (ret < 0)
1371 return ret;
cb4f4d3c
CH		 1372
1373 spin_lock_irqsave(&cmd->t_state_lock, flags);
1374 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1375 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1376
c66ac9db
NB		 1377 /*
1378 * Check for SAM Task Attribute Emulation
1379 */
1380 if (transport_check_alloc_task_attr(cmd) < 0) {
1381 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1382 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1383 return -EINVAL;
c66ac9db
NB		 1384 }
1385 spin_lock(&cmd->se_lun->lun_sep_lock);
1386 if (cmd->se_lun->lun_sep)
1387 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1388 spin_unlock(&cmd->se_lun->lun_sep_lock);
1389 return 0;
1390}
a12f41f8 1391EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1392
695434e1
NB		 1393/*
1394 * Used by fabric module frontends to queue tasks directly.
1395 * Many only be used from process context only
1396 */
1397int transport_handle_cdb_direct(
1398 struct se_cmd *cmd)
1399{
dd8ae59d
NB		 1400 int ret;
1401
695434e1
NB		 1402 if (!cmd->se_lun) {
1403 dump_stack();
6708bb27 1404 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1405 return -EINVAL;
1406 }
1407 if (in_interrupt()) {
1408 dump_stack();
6708bb27 1409 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1410 " from interrupt context\n");
1411 return -EINVAL;
1412 }
dd8ae59d 1413 /*
af877292
CH		 1414 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1415 * outstanding descriptors are handled correctly during shutdown via
1416 * transport_wait_for_tasks()
dd8ae59d
NB		 1417 *
1418 * Also, we don't take cmd->t_state_lock here as we only expect
1419 * this to be called for initial descriptor submission.
1420 */
1421 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1422 cmd->transport_state |= CMD_T_ACTIVE;
1423
dd8ae59d
NB		 1424 /*
1425 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1426 * so follow TRANSPORT_NEW_CMD processing thread context usage
1427 * and call transport_generic_request_failure() if necessary..
1428 */
1429 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1430 if (ret < 0)
1431 transport_generic_request_failure(cmd);
1432
dd8ae59d 1433 return 0;
695434e1
NB		 1434}
1435EXPORT_SYMBOL(transport_handle_cdb_direct);
1436
a6360785
NB		 1437/**
1438 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1439 *
1440 * @se_cmd: command descriptor to submit
1441 * @se_sess: associated se_sess for endpoint
1442 * @cdb: pointer to SCSI CDB
1443 * @sense: pointer to SCSI sense buffer
1444 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1445 * @data_length: fabric expected data transfer length
1446 * @task_addr: SAM task attribute
1447 * @data_dir: DMA data direction
1448 * @flags: flags for command submission from target_sc_flags_tables
1449 *
1450 * This may only be called from process context, and also currently
1451 * assumes internal allocation of fabric payload buffer by target-core.
1452 **/
1edcdb49 1453void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1454 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1455 u32 data_length, int task_attr, int data_dir, int flags)
1456{
1457 struct se_portal_group *se_tpg;
1458 int rc;
1459
1460 se_tpg = se_sess->se_tpg;
1461 BUG_ON(!se_tpg);
1462 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1463 BUG_ON(in_interrupt());
1464 /*
1465 * Initialize se_cmd for target operation. From this point
1466 * exceptions are handled by sending exception status via
1467 * target_core_fabric_ops->queue_status() callback
1468 */
1469 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1470 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1471 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1472 se_cmd->unknown_data_length = 1;
a6360785
NB		 1473 /*
1474 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1475 * se_sess->sess_cmd_list. A second kref_get here is necessary
1476 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1477 * kref_put() to happen during fabric packet acknowledgement.
1478 */
bc187ea6
RD		 1479 rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1480 if (rc)
1481 return;
a6360785
NB		 1482 /*
1483 * Signal bidirectional data payloads to target-core
1484 */
1485 if (flags & TARGET_SCF_BIDI_OP)
1486 se_cmd->se_cmd_flags |= SCF_BIDI;
1487 /*
1488 * Locate se_lun pointer and attach it to struct se_cmd
1489 */
735703ca
NB		 1490 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1491 transport_send_check_condition_and_sense(se_cmd,
1492 se_cmd->scsi_sense_reason, 0);
1493 target_put_sess_cmd(se_sess, se_cmd);
1494 return;
1495 }
d6e0175c 1496
a12f41f8 1497 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca
NB		 1498 if (rc != 0) {
1499 transport_generic_request_failure(se_cmd);
1500 return;
1501 }
11e319ed
AG		 1502
1503 /*
1504 * Check if we need to delay processing because of ALUA
1505 * Active/NonOptimized primary access state..
1506 */
1507 core_alua_check_nonop_delay(se_cmd);
1508
a6360785 1509 transport_handle_cdb_direct(se_cmd);
1edcdb49 1510 return;
a6360785
NB		 1511}
1512EXPORT_SYMBOL(target_submit_cmd);
1513
9f0d05c2
NB		 1514static void target_complete_tmr_failure(struct work_struct *work)
1515{
1516 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1517
1518 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1519 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1520 transport_generic_free_cmd(se_cmd, 0);
1521}
1522
ea98d7f9
AG		 1523/**
1524 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1525 * for TMR CDBs
1526 *
1527 * @se_cmd: command descriptor to submit
1528 * @se_sess: associated se_sess for endpoint
1529 * @sense: pointer to SCSI sense buffer
1530 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1531 * @fabric_context: fabric context for TMR req
1532 * @tm_type: Type of TM request
c0974f89
NB		 1533 * @gfp: gfp type for caller
1534 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1535 * @flags: submit cmd flags
ea98d7f9
AG		 1536 *
1537 * Callable from all contexts.
1538 **/
1539
c7042cae 1540int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1541 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1542 void *fabric_tmr_ptr, unsigned char tm_type,
1543 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1544{
1545 struct se_portal_group *se_tpg;
1546 int ret;
1547
1548 se_tpg = se_sess->se_tpg;
1549 BUG_ON(!se_tpg);
1550
1551 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1552 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1553 /*
1554 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1555 * allocation failure.
1556 */
c0974f89 1557 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1558 if (ret < 0)
1559 return -ENOMEM;
ea98d7f9 1560
c0974f89
NB		 1561 if (tm_type == TMR_ABORT_TASK)
1562 se_cmd->se_tmr_req->ref_task_tag = tag;
1563
ea98d7f9 1564 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1565 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1566 if (ret) {
1567 core_tmr_release_req(se_cmd->se_tmr_req);
1568 return ret;
1569 }
ea98d7f9 1570
ea98d7f9
AG		 1571 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1572 if (ret) {
9f0d05c2
NB		 1573 /*
1574 * For callback during failure handling, push this work off
1575 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1576 */
1577 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1578 schedule_work(&se_cmd->work);
c7042cae 1579 return 0;
ea98d7f9
AG		 1580 }
1581 transport_generic_handle_tmr(se_cmd);
c7042cae 1582 return 0;
ea98d7f9
AG		 1583}
1584EXPORT_SYMBOL(target_submit_tmr);
1585
cdbb70bb 1586/*
cf572a96 1587 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1588 * has completed.
1589 */
cf572a96 1590bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1591{
cdbb70bb
CH		 1592 bool was_active = false;
1593
cf572a96
CH		 1594 if (cmd->transport_state & CMD_T_BUSY) {
1595 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1596 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1597
cf572a96
CH		 1598 pr_debug("cmd %p waiting to complete\n", cmd);
1599 wait_for_completion(&cmd->task_stop_comp);
1600 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1601
1602 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1603 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1604 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1605 was_active = true;
1606 }
1607
cdbb70bb
CH		 1608 return was_active;
1609}
1610
c66ac9db
NB		 1611/*
1612 * Handle SAM-esque emulation for generic transport request failures.
1613 */
2fbff127 1614void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1615{
07bde79a
NB		 1616 int ret = 0;
1617
6708bb27 1618 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1619 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1620 cmd->t_task_cdb[0]);
03e98c9e 1621 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1622 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1623 cmd->t_state, cmd->scsi_sense_reason);
d43d6aea 1624 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1625 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1626 (cmd->transport_state & CMD_T_STOP) != 0,
1627 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1628
c66ac9db
NB		 1629 /*
1630 * For SAM Task Attribute emulation for failed struct se_cmd
1631 */
1632 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1633 transport_complete_task_attr(cmd);
1634
03e98c9e
NB		 1635 switch (cmd->scsi_sense_reason) {
1636 case TCM_NON_EXISTENT_LUN:
1637 case TCM_UNSUPPORTED_SCSI_OPCODE:
1638 case TCM_INVALID_CDB_FIELD:
1639 case TCM_INVALID_PARAMETER_LIST:
1640 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1641 case TCM_UNKNOWN_MODE_PAGE:
1642 case TCM_WRITE_PROTECTED:
1643 case TCM_CHECK_CONDITION_ABORT_CMD:
1644 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1645 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1646 break;
03e98c9e 1647 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1648 /*
1649 * No SENSE Data payload for this case, set SCSI Status
1650 * and queue the response to $FABRIC_MOD.
1651 *
1652 * Uses linux/include/scsi/scsi.h SAM status codes defs
1653 */
1654 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1655 /*
1656 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1657 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1658 * CONFLICT STATUS.
1659 *
1660 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1661 */
e3d6f909
AG		 1662 if (cmd->se_sess &&
1663 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1664 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1665 cmd->orig_fe_lun, 0x2C,
1666 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1667
07bde79a 1668 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1669 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1670 goto queue_full;
c66ac9db 1671 goto check_stop;
c66ac9db 1672 default:
6708bb27 1673 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1674 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1675 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1676 break;
1677 }
f3146437 1678
03e98c9e
NB		 1679 ret = transport_send_check_condition_and_sense(cmd,
1680 cmd->scsi_sense_reason, 0);
1681 if (ret == -EAGAIN || ret == -ENOMEM)
1682 goto queue_full;
07bde79a 1683
c66ac9db
NB		 1684check_stop:
1685 transport_lun_remove_cmd(cmd);
6708bb27 1686 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1687 ;
07bde79a
NB		 1688 return;
1689
1690queue_full:
e057f533
CH		 1691 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1692 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1693}
2fbff127 1694EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1695
5f41a31d 1696static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1697{
0c2ad7d1 1698 int error = 0;
5f41a31d
CH		 1699
1700 spin_lock_irq(&cmd->t_state_lock);
1701 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1702 spin_unlock_irq(&cmd->t_state_lock);
1703
1704 if (cmd->execute_cmd)
1705 error = cmd->execute_cmd(cmd);
5f41a31d
CH		 1706
1707 if (error) {
1708 spin_lock_irq(&cmd->t_state_lock);
1709 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1710 spin_unlock_irq(&cmd->t_state_lock);
1711
1712 transport_generic_request_failure(cmd);
1713 }
1714}
1715
70baf0ab 1716void target_execute_cmd(struct se_cmd *cmd)
5f41a31d
CH		 1717{
1718 struct se_device *dev = cmd->se_dev;
1719
d59a02b4
CH		 1720 /*
1721 * If the received CDB has aleady been aborted stop processing it here.
1722 */
1723 if (transport_check_aborted_status(cmd, 1))
1724 return;
1725
f7113a47
CH		 1726 /*
1727 * Determine if IOCTL context caller in requesting the stopping of this
1728 * command for LUN shutdown purposes.
1729 */
1730 spin_lock_irq(&cmd->t_state_lock);
1731 if (cmd->transport_state & CMD_T_LUN_STOP) {
1732 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1733 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1734
1735 cmd->transport_state &= ~CMD_T_ACTIVE;
1736 spin_unlock_irq(&cmd->t_state_lock);
1737 complete(&cmd->transport_lun_stop_comp);
1738 return;
1739 }
1740 /*
1741 * Determine if frontend context caller is requesting the stopping of
1742 * this command for frontend exceptions.
1743 */
1744 if (cmd->transport_state & CMD_T_STOP) {
1745 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1746 __func__, __LINE__,
1747 cmd->se_tfo->get_task_tag(cmd));
1748
1749 spin_unlock_irq(&cmd->t_state_lock);
1750 complete(&cmd->t_transport_stop_comp);
5f41a31d 1751 return;
f7113a47
CH		 1752 }
1753
1754 cmd->t_state = TRANSPORT_PROCESSING;
1755 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d
CH		 1756
1757 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1758 goto execute;
1759
c66ac9db 1760 /*
25985edc 1761 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1762 * to allow the passed struct se_cmd list of tasks to the front of the list.
1763 */
5f41a31d
CH		 1764 switch (cmd->sam_task_attr) {
1765 case MSG_HEAD_TAG:
1766 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1767 "se_ordered_id: %u\n",
1768 cmd->t_task_cdb[0], cmd->se_ordered_id);
1769 goto execute;
1770 case MSG_ORDERED_TAG:
1771 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1772 smp_mb__after_atomic_inc();
1773
5f41a31d
CH		 1774 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1775 " se_ordered_id: %u\n",
1776 cmd->t_task_cdb[0], cmd->se_ordered_id);
1777
c66ac9db 1778 /*
5f41a31d
CH		 1779 * Execute an ORDERED command if no other older commands
1780 * exist that need to be completed first.
c66ac9db 1781 */
5f41a31d
CH		 1782 if (!atomic_read(&dev->simple_cmds))
1783 goto execute;
1784 break;
1785 default:
c66ac9db
NB		 1786 /*
1787 * For SIMPLE and UNTAGGED Task Attribute commands
1788 */
5f41a31d 1789 atomic_inc(&dev->simple_cmds);
c66ac9db 1790 smp_mb__after_atomic_inc();
5f41a31d 1791 break;
c66ac9db 1792 }
5f41a31d
CH		 1793
1794 if (atomic_read(&dev->dev_ordered_sync) != 0) {
1795 spin_lock(&dev->delayed_cmd_lock);
5f41a31d
CH		 1796 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1797 spin_unlock(&dev->delayed_cmd_lock);
c66ac9db 1798
6708bb27 1799 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 1800 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 1801 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db 1802 cmd->se_ordered_id);
5f41a31d 1803 return;
c66ac9db 1804 }
c66ac9db 1805
5f41a31d 1806execute:
c66ac9db 1807 /*
5f41a31d 1808 * Otherwise, no ORDERED task attributes exist..
c66ac9db 1809 */
5f41a31d 1810 __target_execute_cmd(cmd);
c66ac9db 1811}
70baf0ab 1812EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1813
c66ac9db
NB		 1814/*
1815 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
1816 */
1817static int transport_get_sense_data(struct se_cmd *cmd)
1818{
1819 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 1820 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1821 unsigned long flags;
1822 u32 offset = 0;
1823
e3d6f909
AG		 1824 WARN_ON(!cmd->se_lun);
1825
42bf829e
CH		 1826 if (!dev)
1827 return 0;
1828
a1d8b49a 1829 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1830 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 1831 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1832 return 0;
1833 }
1834
cf572a96
CH		 1835 if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
1836 goto out;
c66ac9db 1837
cf572a96
CH		 1838 if (!dev->transport->get_sense_buffer) {
1839 pr_err("dev->transport->get_sense_buffer is NULL\n");
1840 goto out;
1841 }
c66ac9db 1842
5787cacd 1843 sense_buffer = dev->transport->get_sense_buffer(cmd);
cf572a96 1844 if (!sense_buffer) {
5787cacd 1845 pr_err("ITT 0x%08x cmd %p: Unable to locate"
cf572a96 1846 " sense buffer for task with sense\n",
5787cacd 1847 cmd->se_tfo->get_task_tag(cmd), cmd);
cf572a96 1848 goto out;
c66ac9db 1849 }
5787cacd 1850
cf572a96
CH		 1851 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1852
1853 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
1854
1855 memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
cf572a96
CH		 1856
1857 /* Automatically padded */
1858 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
1859
1860 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
1861 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
1862 return 0;
1863
785fdf70 1864out:
a1d8b49a 1865 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1866 return -1;
1867}
1868
5f41a31d
CH		 1869/*
1870 * Process all commands up to the last received ORDERED task attribute which
1871 * requires another blocking boundary
1872 */
1873static void target_restart_delayed_cmds(struct se_device *dev)
1874{
1875 for (;;) {
1876 struct se_cmd *cmd;
1877
1878 spin_lock(&dev->delayed_cmd_lock);
1879 if (list_empty(&dev->delayed_cmd_list)) {
1880 spin_unlock(&dev->delayed_cmd_lock);
1881 break;
1882 }
1883
1884 cmd = list_entry(dev->delayed_cmd_list.next,
1885 struct se_cmd, se_delayed_node);
1886 list_del(&cmd->se_delayed_node);
1887 spin_unlock(&dev->delayed_cmd_lock);
1888
1889 __target_execute_cmd(cmd);
1890
1891 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1892 break;
1893 }
1894}
1895
c66ac9db 1896/*
35e0e757 1897 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1898 * and ordered cmds need to have their tasks added to the execution queue.
1899 */
1900static void transport_complete_task_attr(struct se_cmd *cmd)
1901{
5951146d 1902 struct se_device *dev = cmd->se_dev;
c66ac9db 1903
e66ecd50 1904 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1905 atomic_dec(&dev->simple_cmds);
1906 smp_mb__after_atomic_dec();
1907 dev->dev_cur_ordered_id++;
6708bb27 1908 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1909 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1910 cmd->se_ordered_id);
e66ecd50 1911 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1912 dev->dev_cur_ordered_id++;
6708bb27 1913 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1914 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1915 cmd->se_ordered_id);
e66ecd50 1916 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1917 atomic_dec(&dev->dev_ordered_sync);
1918 smp_mb__after_atomic_dec();
c66ac9db
NB		 1919
1920 dev->dev_cur_ordered_id++;
6708bb27 1921 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1922 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1923 }
c66ac9db 1924
5f41a31d 1925 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1926}
1927
e057f533 1928static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1929{
1930 int ret = 0;
1931
e057f533
CH		 1932 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1933 transport_complete_task_attr(cmd);
1934
1935 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1936 ret = cmd->se_tfo->queue_status(cmd);
1937 if (ret)
1938 goto out;
1939 }
07bde79a
NB		 1940
1941 switch (cmd->data_direction) {
1942 case DMA_FROM_DEVICE:
1943 ret = cmd->se_tfo->queue_data_in(cmd);
1944 break;
1945 case DMA_TO_DEVICE:
ec98f782 1946 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 1947 ret = cmd->se_tfo->queue_data_in(cmd);
1948 if (ret < 0)
e057f533 1949 break;
07bde79a
NB		 1950 }
1951 /* Fall through for DMA_TO_DEVICE */
1952 case DMA_NONE:
1953 ret = cmd->se_tfo->queue_status(cmd);
1954 break;
1955 default:
1956 break;
1957 }
1958
e057f533
CH		 1959out:
1960 if (ret < 0) {
1961 transport_handle_queue_full(cmd, cmd->se_dev);
1962 return;
1963 }
1964 transport_lun_remove_cmd(cmd);
1965 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1966}
1967
1968static void transport_handle_queue_full(
1969 struct se_cmd *cmd,
e057f533 1970 struct se_device *dev)
07bde79a
NB		 1971{
1972 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1973 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1974 atomic_inc(&dev->dev_qf_count);
1975 smp_mb__after_atomic_inc();
1976 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1977
1978 schedule_work(&cmd->se_dev->qf_work_queue);
1979}
1980
35e0e757 1981static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1982{
35e0e757 1983 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 1984 int reason = 0, ret;
35e0e757 1985
c66ac9db
NB		 1986 /*
1987 * Check if we need to move delayed/dormant tasks from cmds on the
1988 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1989 * Attribute.
1990 */
5951146d 1991 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 1992 transport_complete_task_attr(cmd);
07bde79a
NB		 1993 /*
1994 * Check to schedule QUEUE_FULL work, or execute an existing
1995 * cmd->transport_qf_callback()
1996 */
1997 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1998 schedule_work(&cmd->se_dev->qf_work_queue);
1999
c66ac9db
NB		 2000 /*
2001 * Check if we need to retrieve a sense buffer from
2002 * the struct se_cmd in question.
2003 */
2004 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2005 if (transport_get_sense_data(cmd) < 0)
2006 reason = TCM_NON_EXISTENT_LUN;
2007
c66ac9db 2008 if (cmd->scsi_status) {
07bde79a 2009 ret = transport_send_check_condition_and_sense(
c66ac9db 2010 cmd, reason, 1);
f147abb4 2011 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 2012 goto queue_full;
2013
c66ac9db
NB		 2014 transport_lun_remove_cmd(cmd);
2015 transport_cmd_check_stop_to_fabric(cmd);
2016 return;
2017 }
2018 }
2019 /*
25985edc 2020 * Check for a callback, used by amongst other things
c66ac9db
NB		 2021 * XDWRITE_READ_10 emulation.
2022 */
2023 if (cmd->transport_complete_callback)
2024 cmd->transport_complete_callback(cmd);
2025
2026 switch (cmd->data_direction) {
2027 case DMA_FROM_DEVICE:
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);
c66ac9db 2034
07bde79a 2035 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2036 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2037 goto queue_full;
c66ac9db
NB		 2038 break;
2039 case DMA_TO_DEVICE:
2040 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2041 if (cmd->se_lun->lun_sep) {
2042 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2043 cmd->data_length;
2044 }
2045 spin_unlock(&cmd->se_lun->lun_sep_lock);
2046 /*
2047 * Check if we need to send READ payload for BIDI-COMMAND
2048 */
ec98f782 2049 if (cmd->t_bidi_data_sg) {
c66ac9db 2050 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2051 if (cmd->se_lun->lun_sep) {
2052 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2053 cmd->data_length;
2054 }
2055 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2056 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2057 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2058 goto queue_full;
c66ac9db
NB		 2059 break;
2060 }
2061 /* Fall through for DMA_TO_DEVICE */
2062 case DMA_NONE:
07bde79a 2063 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2064 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2065 goto queue_full;
c66ac9db
NB		 2066 break;
2067 default:
2068 break;
2069 }
2070
2071 transport_lun_remove_cmd(cmd);
2072 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2073 return;
2074
2075queue_full:
6708bb27 2076 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2077 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2078 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2079 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2080}
2081
6708bb27 2082static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2083{
ec98f782 2084 struct scatterlist *sg;
ec98f782 2085 int count;
c66ac9db 2086
6708bb27
AG		 2087 for_each_sg(sgl, sg, nents, count)
2088 __free_page(sg_page(sg));
c66ac9db 2089
6708bb27
AG		 2090 kfree(sgl);
2091}
c66ac9db 2092
6708bb27
AG		 2093static inline void transport_free_pages(struct se_cmd *cmd)
2094{
2095 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2096 return;
2097
2098 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2099 cmd->t_data_sg = NULL;
2100 cmd->t_data_nents = 0;
c66ac9db 2101
6708bb27 2102 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2103 cmd->t_bidi_data_sg = NULL;
2104 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2105}
2106
e26d99ae
CH		 2107/**
2108 * transport_release_cmd - free a command
2109 * @cmd: command to free
2110 *
2111 * This routine unconditionally frees a command, and reference counting
2112 * or list removal must be done in the caller.
2113 */
2114static void transport_release_cmd(struct se_cmd *cmd)
2115{
2116 BUG_ON(!cmd->se_tfo);
2117
c8e31f26 2118 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2119 core_tmr_release_req(cmd->se_tmr_req);
2120 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2121 kfree(cmd->t_task_cdb);
2122 /*
7481deb4
NB		 2123 * If this cmd has been setup with target_get_sess_cmd(), drop
2124 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2125 */
7481deb4
NB		 2126 if (cmd->check_release != 0) {
2127 target_put_sess_cmd(cmd->se_sess, cmd);
2128 return;
2129 }
e26d99ae
CH		 2130 cmd->se_tfo->release_cmd(cmd);
2131}
2132
d3df7825
CH		 2133/**
2134 * transport_put_cmd - release a reference to a command
2135 * @cmd: command to release
2136 *
2137 * This routine releases our reference to the command and frees it if possible.
2138 */
39c05f32 2139static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 2140{
2141 unsigned long flags;
c66ac9db 2142
a1d8b49a 2143 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 2144 if (atomic_read(&cmd->t_fe_count)) {
2145 if (!atomic_dec_and_test(&cmd->t_fe_count))
2146 goto out_busy;
2147 }
2148
7d680f3b
CH		 2149 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2150 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2151 target_remove_from_state_list(cmd);
c66ac9db 2152 }
a1d8b49a 2153 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2154
c66ac9db 2155 transport_free_pages(cmd);
31afc39c 2156 transport_release_cmd(cmd);
39c05f32 2157 return;
4911e3cc
CH		 2158out_busy:
2159 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2160}
2161
c66ac9db 2162/*
ec98f782
AG		 2163 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2164 * allocating in the core.
c66ac9db
NB		 2165 * @cmd: Associated se_cmd descriptor
2166 * @mem: SGL style memory for TCM WRITE / READ
2167 * @sg_mem_num: Number of SGL elements
2168 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2169 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2170 *
2171 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2172 * of parameters.
2173 */
2174int transport_generic_map_mem_to_cmd(
2175 struct se_cmd *cmd,
5951146d
AG		 2176 struct scatterlist *sgl,
2177 u32 sgl_count,
2178 struct scatterlist *sgl_bidi,
2179 u32 sgl_bidi_count)
c66ac9db 2180{
5951146d 2181 if (!sgl || !sgl_count)
c66ac9db 2182 return 0;
c66ac9db 2183
64f1db38
CH		 2184 /*
2185 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2186 * scatterlists already have been set to follow what the fabric
2187 * passes for the original expected data transfer length.
2188 */
2189 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2190 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2191 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2192 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2193 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2194 return -EINVAL;
2195 }
c66ac9db 2196
64f1db38
CH		 2197 cmd->t_data_sg = sgl;
2198 cmd->t_data_nents = sgl_count;
c66ac9db 2199
64f1db38
CH		 2200 if (sgl_bidi && sgl_bidi_count) {
2201 cmd->t_bidi_data_sg = sgl_bidi;
2202 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db 2203 }
64f1db38 2204 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 2205 return 0;
2206}
2207EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2208
4949314c 2209void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2210{
ec98f782 2211 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2212 struct page **pages;
2213 int i;
05d1c7c0 2214
ec98f782 2215 BUG_ON(!sg);
05d1c7c0 2216 /*
ec98f782
AG		 2217 * We need to take into account a possible offset here for fabrics like
2218 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2219 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2220 */
4949314c
AG		 2221 if (!cmd->t_data_nents)
2222 return NULL;
2223 else if (cmd->t_data_nents == 1)
2224 return kmap(sg_page(sg)) + sg->offset;
2225
2226 /* >1 page. use vmap */
2227 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2228 if (!pages)
2229 return NULL;
2230
2231 /* convert sg[] to pages[] */
2232 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2233 pages[i] = sg_page(sg);
2234 }
2235
2236 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2237 kfree(pages);
2238 if (!cmd->t_data_vmap)
2239 return NULL;
2240
2241 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2242}
4949314c 2243EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2244
4949314c 2245void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2246{
a1edf9cf 2247 if (!cmd->t_data_nents) {
4949314c 2248 return;
a1edf9cf 2249 } else if (cmd->t_data_nents == 1) {
4949314c 2250 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2251 return;
2252 }
4949314c
AG		 2253
2254 vunmap(cmd->t_data_vmap);
2255 cmd->t_data_vmap = NULL;
05d1c7c0 2256}
4949314c 2257EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2258
c66ac9db 2259static int
05d1c7c0 2260transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2261{
ec98f782
AG		 2262 u32 length = cmd->data_length;
2263 unsigned int nents;
2264 struct page *page;
9db9da33 2265 gfp_t zero_flag;
ec98f782 2266 int i = 0;
c66ac9db 2267
ec98f782
AG		 2268 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2269 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2270 if (!cmd->t_data_sg)
2271 return -ENOMEM;
c66ac9db 2272
ec98f782
AG		 2273 cmd->t_data_nents = nents;
2274 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2275
64f1db38 2276 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2277
ec98f782
AG		 2278 while (length) {
2279 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2280 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2281 if (!page)
2282 goto out;
c66ac9db 2283
ec98f782
AG		 2284 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2285 length -= page_len;
2286 i++;
c66ac9db 2287 }
c66ac9db 2288 return 0;
c66ac9db 2289
ec98f782
AG		 2290out:
2291 while (i >= 0) {
2292 __free_page(sg_page(&cmd->t_data_sg[i]));
2293 i--;
c66ac9db 2294 }
ec98f782
AG		 2295 kfree(cmd->t_data_sg);
2296 cmd->t_data_sg = NULL;
2297 return -ENOMEM;
c66ac9db
NB		 2298}
2299
da0f7619 2300/*
b16a35b0
AG		 2301 * Allocate any required resources to execute the command. For writes we
2302 * might not have the payload yet, so notify the fabric via a call to
2303 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2304 */
a1d8b49a 2305int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2306{
c66ac9db
NB		 2307 int ret = 0;
2308
2309 /*
2310 * Determine is the TCM fabric module has already allocated physical
2311 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2312 * beforehand.
c66ac9db 2313 */
ec98f782
AG		 2314 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2315 cmd->data_length) {
05d1c7c0 2316 ret = transport_generic_get_mem(cmd);
c66ac9db 2317 if (ret < 0)
03e98c9e 2318 goto out_fail;
c66ac9db 2319 }
da0f7619 2320
4101f0a8 2321 /* Workaround for handling zero-length control CDBs */
64f1db38 2322 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) {
7d680f3b 2323 spin_lock_irq(&cmd->t_state_lock);
410f6702 2324 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 2325 cmd->transport_state |= CMD_T_ACTIVE;
2326 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 2327
2328 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2329 u8 ua_asc = 0, ua_ascq = 0;
2330
2331 core_scsi3_ua_clear_for_request_sense(cmd,
2332 &ua_asc, &ua_ascq);
2333 }
2334
410f6702
RD		 2335 INIT_WORK(&cmd->work, target_complete_ok_work);
2336 queue_work(target_completion_wq, &cmd->work);
2337 return 0;
2338 }
da0f7619 2339
4101f0a8 2340 atomic_inc(&cmd->t_fe_count);
4101f0a8 2341
c66ac9db 2342 /*
c3196f0c
CH		 2343 * If this command is not a write we can execute it right here,
2344 * for write buffers we need to notify the fabric driver first
2345 * and let it call back once the write buffers are ready.
c66ac9db 2346 */
5f41a31d 2347 target_add_to_state_list(cmd);
c3196f0c
CH		 2348 if (cmd->data_direction != DMA_TO_DEVICE) {
2349 target_execute_cmd(cmd);
2350 return 0;
2351 }
2352
2353 spin_lock_irq(&cmd->t_state_lock);
2354 cmd->t_state = TRANSPORT_WRITE_PENDING;
2355 spin_unlock_irq(&cmd->t_state_lock);
2356
2357 transport_cmd_check_stop(cmd, false);
2358
2359 ret = cmd->se_tfo->write_pending(cmd);
2360 if (ret == -EAGAIN || ret == -ENOMEM)
2361 goto queue_full;
2362
2363 if (ret < 0)
2364 return ret;
2365 return 1;
da0f7619
CH		 2366
2367out_fail:
2368 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2369 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2370 return -EINVAL;
c3196f0c
CH		 2371queue_full:
2372 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2373 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2374 transport_handle_queue_full(cmd, cmd->se_dev);
2375 return 0;
c66ac9db 2376}
a1d8b49a 2377EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2378
e057f533 2379static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2380{
f147abb4
NB		 2381 int ret;
2382
2383 ret = cmd->se_tfo->write_pending(cmd);
2384 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2385 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2386 cmd);
2387 transport_handle_queue_full(cmd, cmd->se_dev);
2388 }
07bde79a
NB		 2389}
2390
39c05f32 2391void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2392{
d14921d6 2393 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2394 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2395 transport_wait_for_tasks(cmd);
2396
35462975 2397 transport_release_cmd(cmd);
d14921d6
NB		 2398 } else {
2399 if (wait_for_tasks)
2400 transport_wait_for_tasks(cmd);
2401
c66ac9db
NB		 2402 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2403
82f1c8a4 2404 if (cmd->se_lun)
c66ac9db 2405 transport_lun_remove_cmd(cmd);
c66ac9db 2406
39c05f32 2407 transport_put_cmd(cmd);
c66ac9db
NB		 2408 }
2409}
2410EXPORT_SYMBOL(transport_generic_free_cmd);
2411
a17f091d
NB		 2412/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2413 * @se_sess: session to reference
2414 * @se_cmd: command descriptor to add
a6360785 2415 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2416 */
bc187ea6
RD		 2417static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2418 bool ack_kref)
a17f091d
NB		 2419{
2420 unsigned long flags;
bc187ea6 2421 int ret = 0;
a17f091d 2422
7481deb4 2423 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2424 /*
2425 * Add a second kref if the fabric caller is expecting to handle
2426 * fabric acknowledgement that requires two target_put_sess_cmd()
2427 * invocations before se_cmd descriptor release.
2428 */
86715569 2429 if (ack_kref == true) {
a6360785 2430 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2431 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2432 }
7481deb4 2433
a17f091d 2434 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2435 if (se_sess->sess_tearing_down) {
2436 ret = -ESHUTDOWN;
2437 goto out;
2438 }
a17f091d
NB		 2439 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2440 se_cmd->check_release = 1;
bc187ea6
RD		 2441
2442out:
a17f091d 2443 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2444 return ret;
a17f091d 2445}
a17f091d 2446
7481deb4 2447static void target_release_cmd_kref(struct kref *kref)
a17f091d 2448{
7481deb4
NB		 2449 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2450 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 2451 unsigned long flags;
2452
2453 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2454 if (list_empty(&se_cmd->se_cmd_list)) {
2455 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2456 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2457 return;
a17f091d 2458 }
a17f091d
NB		 2459 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2460 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2461 complete(&se_cmd->cmd_wait_comp);
7481deb4 2462 return;
a17f091d
NB		 2463 }
2464 list_del(&se_cmd->se_cmd_list);
2465 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2466
7481deb4
NB		 2467 se_cmd->se_tfo->release_cmd(se_cmd);
2468}
2469
2470/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2471 * @se_sess: session to reference
2472 * @se_cmd: command descriptor to drop
2473 */
2474int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2475{
2476 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2477}
2478EXPORT_SYMBOL(target_put_sess_cmd);
2479
1c7b13fe
RD		 2480/* target_sess_cmd_list_set_waiting - Flag all commands in
2481 * sess_cmd_list to complete cmd_wait_comp. Set
2482 * sess_tearing_down so no more commands are queued.
2483 * @se_sess: session to flag
a17f091d 2484 */
1c7b13fe 2485void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2486{
2487 struct se_cmd *se_cmd;
2488 unsigned long flags;
2489
a17f091d 2490 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
a17f091d 2491
1c7b13fe
RD		 2492 WARN_ON(se_sess->sess_tearing_down);
2493 se_sess->sess_tearing_down = 1;
a17f091d 2494
1c7b13fe 2495 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
a17f091d
NB		 2496 se_cmd->cmd_wait_set = 1;
2497
2498 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2499}
1c7b13fe 2500EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2501
2502/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2503 * @se_sess: session to wait for active I/O
2504 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2505 */
2506void target_wait_for_sess_cmds(
2507 struct se_session *se_sess,
2508 int wait_for_tasks)
2509{
2510 struct se_cmd *se_cmd, *tmp_cmd;
2511 bool rc = false;
2512
2513 list_for_each_entry_safe(se_cmd, tmp_cmd,
1c7b13fe 2514 &se_sess->sess_cmd_list, se_cmd_list) {
a17f091d
NB		 2515 list_del(&se_cmd->se_cmd_list);
2516
2517 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2518 " %d\n", se_cmd, se_cmd->t_state,
2519 se_cmd->se_tfo->get_cmd_state(se_cmd));
2520
2521 if (wait_for_tasks) {
2522 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2523 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2524 se_cmd->se_tfo->get_cmd_state(se_cmd));
2525
2526 rc = transport_wait_for_tasks(se_cmd);
2527
2528 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2529 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2530 se_cmd->se_tfo->get_cmd_state(se_cmd));
2531 }
2532
2533 if (!rc) {
2534 wait_for_completion(&se_cmd->cmd_wait_comp);
2535 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2536 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2537 se_cmd->se_tfo->get_cmd_state(se_cmd));
2538 }
2539
2540 se_cmd->se_tfo->release_cmd(se_cmd);
2541 }
2542}
2543EXPORT_SYMBOL(target_wait_for_sess_cmds);
2544
c66ac9db
NB		 2545/* transport_lun_wait_for_tasks():
2546 *
2547 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2548 * an struct se_lun to be successfully shutdown.
2549 */
2550static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2551{
2552 unsigned long flags;
cf572a96
CH		 2553 int ret = 0;
2554
c66ac9db
NB		 2555 /*
2556 * If the frontend has already requested this struct se_cmd to
2557 * be stopped, we can safely ignore this struct se_cmd.
2558 */
a1d8b49a 2559 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2560 if (cmd->transport_state & CMD_T_STOP) {
2561 cmd->transport_state &= ~CMD_T_LUN_STOP;
2562
2563 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2564 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2565 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2566 transport_cmd_check_stop(cmd, false);
e3d6f909 2567 return -EPERM;
c66ac9db 2568 }
7d680f3b 2569 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2570 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2571
cf572a96
CH		 2572 // XXX: audit task_flags checks.
2573 spin_lock_irqsave(&cmd->t_state_lock, flags);
2574 if ((cmd->transport_state & CMD_T_BUSY) &&
2575 (cmd->transport_state & CMD_T_SENT)) {
2576 if (!target_stop_cmd(cmd, &flags))
2577 ret++;
cf572a96 2578 }
5f41a31d 2579 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2580
785fdf70
CH		 2581 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2582 " %d\n", cmd, ret);
c66ac9db 2583 if (!ret) {
6708bb27 2584 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2585 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2586 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2587 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2588 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2589 }
c66ac9db
NB		 2590
2591 return 0;
2592}
2593
c66ac9db
NB		 2594static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2595{
2596 struct se_cmd *cmd = NULL;
2597 unsigned long lun_flags, cmd_flags;
2598 /*
2599 * Do exception processing and return CHECK_CONDITION status to the
2600 * Initiator Port.
2601 */
2602 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2603 while (!list_empty(&lun->lun_cmd_list)) {
2604 cmd = list_first_entry(&lun->lun_cmd_list,
2605 struct se_cmd, se_lun_node);
3d26fea0 2606 list_del_init(&cmd->se_lun_node);
5951146d 2607
a1d8b49a 2608 spin_lock(&cmd->t_state_lock);
6708bb27 2609 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2610 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2611 cmd->se_lun->unpacked_lun,
2612 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2613 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2614 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2615
2616 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2617
6708bb27
AG		 2618 if (!cmd->se_lun) {
2619 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2620 cmd->se_tfo->get_task_tag(cmd),
2621 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2622 BUG();
2623 }
2624 /*
2625 * If the Storage engine still owns the iscsi_cmd_t, determine
2626 * and/or stop its context.
2627 */
6708bb27 2628 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2629 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2630 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2631
e3d6f909 2632 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2633 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2634 continue;
2635 }
2636
6708bb27 2637 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2638 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2639 cmd->se_lun->unpacked_lun,
2640 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2641
a1d8b49a 2642 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2643 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2644 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2645 goto check_cond;
2646 }
7d680f3b 2647 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2648 target_remove_from_state_list(cmd);
a1d8b49a 2649 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2650
c66ac9db
NB		 2651 /*
2652 * The Storage engine stopped this struct se_cmd before it was
2653 * send to the fabric frontend for delivery back to the
2654 * Initiator Node. Return this SCSI CDB back with an
2655 * CHECK_CONDITION status.
2656 */
2657check_cond:
2658 transport_send_check_condition_and_sense(cmd,
2659 TCM_NON_EXISTENT_LUN, 0);
2660 /*
2661 * If the fabric frontend is waiting for this iscsi_cmd_t to
2662 * be released, notify the waiting thread now that LU has
2663 * finished accessing it.
2664 */
a1d8b49a 2665 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2666 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2667 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2668 " struct se_cmd: %p ITT: 0x%08x\n",
2669 lun->unpacked_lun,
e3d6f909 2670 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2671
a1d8b49a 2672 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2673 cmd_flags);
f7113a47 2674 transport_cmd_check_stop(cmd, false);
a1d8b49a 2675 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2676 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2677 continue;
2678 }
6708bb27 2679 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2680 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2681
a1d8b49a 2682 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2683 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2684 }
2685 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2686}
2687
2688static int transport_clear_lun_thread(void *p)
2689{
8359cf43 2690 struct se_lun *lun = p;
c66ac9db
NB		 2691
2692 __transport_clear_lun_from_sessions(lun);
2693 complete(&lun->lun_shutdown_comp);
2694
2695 return 0;
2696}
2697
2698int transport_clear_lun_from_sessions(struct se_lun *lun)
2699{
2700 struct task_struct *kt;
2701
5951146d 2702 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2703 "tcm_cl_%u", lun->unpacked_lun);
2704 if (IS_ERR(kt)) {
6708bb27 2705 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2706 return PTR_ERR(kt);
c66ac9db
NB		 2707 }
2708 wait_for_completion(&lun->lun_shutdown_comp);
2709
2710 return 0;
2711}
2712
d14921d6
NB		 2713/**
2714 * transport_wait_for_tasks - wait for completion to occur
2715 * @cmd: command to wait
c66ac9db 2716 *
d14921d6
NB		 2717 * Called from frontend fabric context to wait for storage engine
2718 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2719 */
a17f091d 2720bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2721{
2722 unsigned long flags;
2723
a1d8b49a 2724 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2725 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2726 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2727 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2728 return false;
d14921d6 2729 }
cb4f4d3c 2730
c8e31f26
AG		 2731 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2732 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2733 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2734 return false;
d14921d6 2735 }
c66ac9db
NB		 2736 /*
2737 * If we are already stopped due to an external event (ie: LUN shutdown)
2738 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2739 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2740 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2741 * has completed its operation on the struct se_cmd.
2742 */
7d680f3b 2743 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2744 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2745 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2746 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2747 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2748 /*
2749 * There is a special case for WRITES where a FE exception +
2750 * LUN shutdown means ConfigFS context is still sleeping on
2751 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2752 * We go ahead and up transport_lun_stop_comp just to be sure
2753 * here.
2754 */
a1d8b49a
AG		 2755 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2756 complete(&cmd->transport_lun_stop_comp);
2757 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2758 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2759
cf572a96 2760 target_remove_from_state_list(cmd);
c66ac9db
NB		 2761 /*
2762 * At this point, the frontend who was the originator of this
2763 * struct se_cmd, now owns the structure and can be released through
2764 * normal means below.
2765 */
6708bb27 2766 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2767 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2768 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2769 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2770
7d680f3b 2771 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2772 }
7d680f3b 2773
3d28934a 2774 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2775 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2776 return false;
d14921d6 2777 }
c66ac9db 2778
7d680f3b 2779 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2780
6708bb27 2781 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2782 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2783 cmd, cmd->se_tfo->get_task_tag(cmd),
2784 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2785
a1d8b49a 2786 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2787
a1d8b49a 2788 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2789
a1d8b49a 2790 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2791 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2792
6708bb27 2793 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 2794 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2795 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2796
d14921d6 2797 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2798
2799 return true;
c66ac9db 2800}
d14921d6 2801EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2802
2803static int transport_get_sense_codes(
2804 struct se_cmd *cmd,
2805 u8 *asc,
2806 u8 *ascq)
2807{
2808 *asc = cmd->scsi_asc;
2809 *ascq = cmd->scsi_ascq;
2810
2811 return 0;
2812}
2813
2814static int transport_set_sense_codes(
2815 struct se_cmd *cmd,
2816 u8 asc,
2817 u8 ascq)
2818{
2819 cmd->scsi_asc = asc;
2820 cmd->scsi_ascq = ascq;
2821
2822 return 0;
2823}
2824
2825int transport_send_check_condition_and_sense(
2826 struct se_cmd *cmd,
2827 u8 reason,
2828 int from_transport)
2829{
2830 unsigned char *buffer = cmd->sense_buffer;
2831 unsigned long flags;
2832 int offset;
2833 u8 asc = 0, ascq = 0;
2834
a1d8b49a 2835 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2836 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2837 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2838 return 0;
2839 }
2840 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2841 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2842
2843 if (!reason && from_transport)
2844 goto after_reason;
2845
2846 if (!from_transport)
2847 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2848 /*
2849 * Data Segment and SenseLength of the fabric response PDU.
2850 *
2851 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2852 * from include/scsi/scsi_cmnd.h
2853 */
e3d6f909 2854 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2855 TRANSPORT_SENSE_BUFFER);
2856 /*
2857 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2858 * SENSE KEY values from include/scsi/scsi.h
2859 */
2860 switch (reason) {
2861 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 2862 /* CURRENT ERROR */
2863 buffer[offset] = 0x70;
895f3022 2864 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 2865 /* ILLEGAL REQUEST */
2866 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2867 /* LOGICAL UNIT NOT SUPPORTED */
2868 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
2869 break;
c66ac9db
NB		 2870 case TCM_UNSUPPORTED_SCSI_OPCODE:
2871 case TCM_SECTOR_COUNT_TOO_MANY:
2872 /* CURRENT ERROR */
2873 buffer[offset] = 0x70;
895f3022 2874 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2875 /* ILLEGAL REQUEST */
2876 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2877 /* INVALID COMMAND OPERATION CODE */
2878 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
2879 break;
2880 case TCM_UNKNOWN_MODE_PAGE:
2881 /* CURRENT ERROR */
2882 buffer[offset] = 0x70;
895f3022 2883 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2884 /* ILLEGAL REQUEST */
2885 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2886 /* INVALID FIELD IN CDB */
2887 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2888 break;
2889 case TCM_CHECK_CONDITION_ABORT_CMD:
2890 /* CURRENT ERROR */
2891 buffer[offset] = 0x70;
895f3022 2892 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2893 /* ABORTED COMMAND */
2894 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2895 /* BUS DEVICE RESET FUNCTION OCCURRED */
2896 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
2897 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
2898 break;
2899 case TCM_INCORRECT_AMOUNT_OF_DATA:
2900 /* CURRENT ERROR */
2901 buffer[offset] = 0x70;
895f3022 2902 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2903 /* ABORTED COMMAND */
2904 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2905 /* WRITE ERROR */
2906 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2907 /* NOT ENOUGH UNSOLICITED DATA */
2908 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
2909 break;
2910 case TCM_INVALID_CDB_FIELD:
2911 /* CURRENT ERROR */
2912 buffer[offset] = 0x70;
895f3022 2913 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 2914 /* ILLEGAL REQUEST */
2915 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 2916 /* INVALID FIELD IN CDB */
2917 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2918 break;
2919 case TCM_INVALID_PARAMETER_LIST:
2920 /* CURRENT ERROR */
2921 buffer[offset] = 0x70;
895f3022 2922 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 2923 /* ILLEGAL REQUEST */
2924 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 2925 /* INVALID FIELD IN PARAMETER LIST */
2926 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
2927 break;
2928 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2929 /* CURRENT ERROR */
2930 buffer[offset] = 0x70;
895f3022 2931 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2932 /* ABORTED COMMAND */
2933 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2934 /* WRITE ERROR */
2935 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2936 /* UNEXPECTED_UNSOLICITED_DATA */
2937 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
2938 break;
2939 case TCM_SERVICE_CRC_ERROR:
2940 /* CURRENT ERROR */
2941 buffer[offset] = 0x70;
895f3022 2942 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2943 /* ABORTED COMMAND */
2944 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2945 /* PROTOCOL SERVICE CRC ERROR */
2946 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
2947 /* N/A */
2948 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
2949 break;
2950 case TCM_SNACK_REJECTED:
2951 /* CURRENT ERROR */
2952 buffer[offset] = 0x70;
895f3022 2953 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2954 /* ABORTED COMMAND */
2955 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2956 /* READ ERROR */
2957 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
2958 /* FAILED RETRANSMISSION REQUEST */
2959 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
2960 break;
2961 case TCM_WRITE_PROTECTED:
2962 /* CURRENT ERROR */
2963 buffer[offset] = 0x70;
895f3022 2964 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2965 /* DATA PROTECT */
2966 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2967 /* WRITE PROTECTED */
2968 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
2969 break;
2970 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2971 /* CURRENT ERROR */
2972 buffer[offset] = 0x70;
895f3022 2973 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2974 /* UNIT ATTENTION */
2975 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2976 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2977 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2978 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2979 break;
2980 case TCM_CHECK_CONDITION_NOT_READY:
2981 /* CURRENT ERROR */
2982 buffer[offset] = 0x70;
895f3022 2983 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2984 /* Not Ready */
2985 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
2986 transport_get_sense_codes(cmd, &asc, &ascq);
2987 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2988 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2989 break;
2990 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2991 default:
2992 /* CURRENT ERROR */
2993 buffer[offset] = 0x70;
895f3022 2994 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2995 /* ILLEGAL REQUEST */
2996 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2997 /* LOGICAL UNIT COMMUNICATION FAILURE */
2998 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
2999 break;
3000 }
3001 /*
3002 * This code uses linux/include/scsi/scsi.h SAM status codes!
3003 */
3004 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3005 /*
3006 * Automatically padded, this value is encoded in the fabric's
3007 * data_length response PDU containing the SCSI defined sense data.
3008 */
3009 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
3010
3011after_reason:
07bde79a 3012 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3013}
3014EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3015
3016int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3017{
3018 int ret = 0;
3019
7d680f3b 3020 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 3021 if (!send_status ||
c66ac9db
NB		 3022 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3023 return 1;
8b1e1244 3024
6708bb27 3025 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 3026 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 3027 cmd->t_task_cdb[0],
e3d6f909 3028 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3029
c66ac9db 3030 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 3031 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3032 ret = 1;
3033 }
3034 return ret;
3035}
3036EXPORT_SYMBOL(transport_check_aborted_status);
3037
3038void transport_send_task_abort(struct se_cmd *cmd)
3039{
c252f003
NB		 3040 unsigned long flags;
3041
3042 spin_lock_irqsave(&cmd->t_state_lock, flags);
3043 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3044 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3045 return;
3046 }
3047 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3048
c66ac9db
NB		 3049 /*
3050 * If there are still expected incoming fabric WRITEs, we wait
3051 * until until they have completed before sending a TASK_ABORTED
3052 * response. This response with TASK_ABORTED status will be
3053 * queued back to fabric module by transport_check_aborted_status().
3054 */
3055 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3056 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 3057 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 3058 smp_mb__after_atomic_inc();
c66ac9db
NB		 3059 }
3060 }
3061 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3062
6708bb27 3063 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 3064 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 3065 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3066
e3d6f909 3067 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3068}
3069
af877292 3070static void target_tmr_work(struct work_struct *work)
c66ac9db 3071{
af877292 3072 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3073 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3074 struct se_tmr_req *tmr = cmd->se_tmr_req;
3075 int ret;
3076
3077 switch (tmr->function) {
5c6cd613 3078 case TMR_ABORT_TASK:
3d28934a 3079 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3080 break;
5c6cd613
NB		 3081 case TMR_ABORT_TASK_SET:
3082 case TMR_CLEAR_ACA:
3083 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3084 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3085 break;
5c6cd613 3086 case TMR_LUN_RESET:
c66ac9db
NB		 3087 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3088 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3089 TMR_FUNCTION_REJECTED;
3090 break;
5c6cd613 3091 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3092 tmr->response = TMR_FUNCTION_REJECTED;
3093 break;
5c6cd613 3094 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3095 tmr->response = TMR_FUNCTION_REJECTED;
3096 break;
c66ac9db 3097 default:
6708bb27 3098 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3099 tmr->function);
3100 tmr->response = TMR_FUNCTION_REJECTED;
3101 break;
3102 }
3103
3104 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 3105 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3106
b7b8bef7 3107 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3108}
3109
af877292
CH		 3110int transport_generic_handle_tmr(
3111 struct se_cmd *cmd)
c66ac9db 3112{
af877292
CH		 3113 INIT_WORK(&cmd->work, target_tmr_work);
3114 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3115 return 0;
3116}
af877292 3117EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux 6.x block layer and io_uring tree(s)