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tcm_qla2xxx: Remove duplicate header file inclusion
[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 int transport_generic_write_pending(struct se_cmd *);
5951146d 70static int transport_processing_thread(void *param);
c66ac9db 71static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 72static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 73 struct se_device *dev);
05d1c7c0 74static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 75static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 76static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 77static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
35e0e757 78static void target_complete_ok_work(struct work_struct *work);
c66ac9db 79
e3d6f909 80int init_se_kmem_caches(void)
c66ac9db 81{
c66ac9db
NB		 82 se_sess_cache = kmem_cache_create("se_sess_cache",
83 sizeof(struct se_session), __alignof__(struct se_session),
84 0, NULL);
6708bb27
AG		 85 if (!se_sess_cache) {
86 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 87 " failed\n");
c8e31f26 88 goto out;
c66ac9db
NB		 89 }
90 se_ua_cache = kmem_cache_create("se_ua_cache",
91 sizeof(struct se_ua), __alignof__(struct se_ua),
92 0, NULL);
6708bb27
AG		 93 if (!se_ua_cache) {
94 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 95 goto out_free_sess_cache;
c66ac9db 96 }
c66ac9db
NB		 97 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
98 sizeof(struct t10_pr_registration),
99 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 100 if (!t10_pr_reg_cache) {
101 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 102 " failed\n");
35e0e757 103 goto out_free_ua_cache;
c66ac9db
NB		 104 }
105 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
106 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
107 0, NULL);
6708bb27
AG		 108 if (!t10_alua_lu_gp_cache) {
109 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 110 " failed\n");
35e0e757 111 goto out_free_pr_reg_cache;
c66ac9db
NB		 112 }
113 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
114 sizeof(struct t10_alua_lu_gp_member),
115 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 116 if (!t10_alua_lu_gp_mem_cache) {
117 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 118 "cache failed\n");
35e0e757 119 goto out_free_lu_gp_cache;
c66ac9db
NB		 120 }
121 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
122 sizeof(struct t10_alua_tg_pt_gp),
123 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 124 if (!t10_alua_tg_pt_gp_cache) {
125 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 126 "cache failed\n");
35e0e757 127 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 128 }
129 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
130 "t10_alua_tg_pt_gp_mem_cache",
131 sizeof(struct t10_alua_tg_pt_gp_member),
132 __alignof__(struct t10_alua_tg_pt_gp_member),
133 0, NULL);
6708bb27
AG		 134 if (!t10_alua_tg_pt_gp_mem_cache) {
135 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 136 "mem_t failed\n");
35e0e757 137 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 138 }
139
35e0e757
CH		 140 target_completion_wq = alloc_workqueue("target_completion",
141 WQ_MEM_RECLAIM, 0);
142 if (!target_completion_wq)
143 goto out_free_tg_pt_gp_mem_cache;
144
c66ac9db 145 return 0;
35e0e757
CH		 146
147out_free_tg_pt_gp_mem_cache:
148 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
149out_free_tg_pt_gp_cache:
150 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
151out_free_lu_gp_mem_cache:
152 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
153out_free_lu_gp_cache:
154 kmem_cache_destroy(t10_alua_lu_gp_cache);
155out_free_pr_reg_cache:
156 kmem_cache_destroy(t10_pr_reg_cache);
157out_free_ua_cache:
158 kmem_cache_destroy(se_ua_cache);
159out_free_sess_cache:
160 kmem_cache_destroy(se_sess_cache);
c66ac9db 161out:
e3d6f909 162 return -ENOMEM;
c66ac9db
NB		 163}
164
e3d6f909 165void release_se_kmem_caches(void)
c66ac9db 166{
35e0e757 167 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 168 kmem_cache_destroy(se_sess_cache);
169 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 170 kmem_cache_destroy(t10_pr_reg_cache);
171 kmem_cache_destroy(t10_alua_lu_gp_cache);
172 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
173 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
174 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 175}
176
e3d6f909
AG		 177/* This code ensures unique mib indexes are handed out. */
178static DEFINE_SPINLOCK(scsi_mib_index_lock);
179static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 180
181/*
182 * Allocate a new row index for the entry type specified
183 */
184u32 scsi_get_new_index(scsi_index_t type)
185{
186 u32 new_index;
187
e3d6f909 188 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 189
e3d6f909
AG		 190 spin_lock(&scsi_mib_index_lock);
191 new_index = ++scsi_mib_index[type];
192 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 193
194 return new_index;
195}
196
e26d99ae 197static void transport_init_queue_obj(struct se_queue_obj *qobj)
c66ac9db
NB		 198{
199 atomic_set(&qobj->queue_cnt, 0);
200 INIT_LIST_HEAD(&qobj->qobj_list);
201 init_waitqueue_head(&qobj->thread_wq);
202 spin_lock_init(&qobj->cmd_queue_lock);
203}
c66ac9db 204
dbc5623e 205void transport_subsystem_check_init(void)
c66ac9db
NB		 206{
207 int ret;
208
dbc5623e
NB		 209 if (sub_api_initialized)
210 return;
211
c66ac9db
NB		 212 ret = request_module("target_core_iblock");
213 if (ret != 0)
6708bb27 214 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 215
216 ret = request_module("target_core_file");
217 if (ret != 0)
6708bb27 218 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 219
220 ret = request_module("target_core_pscsi");
221 if (ret != 0)
6708bb27 222 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 223
224 ret = request_module("target_core_stgt");
225 if (ret != 0)
6708bb27 226 pr_err("Unable to load target_core_stgt\n");
c66ac9db 227
e3d6f909 228 sub_api_initialized = 1;
dbc5623e 229 return;
c66ac9db
NB		 230}
231
232struct se_session *transport_init_session(void)
233{
234 struct se_session *se_sess;
235
236 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 237 if (!se_sess) {
238 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 239 " se_sess_cache\n");
240 return ERR_PTR(-ENOMEM);
241 }
242 INIT_LIST_HEAD(&se_sess->sess_list);
243 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d
NB		 244 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
245 INIT_LIST_HEAD(&se_sess->sess_wait_list);
246 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 247 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 248
249 return se_sess;
250}
251EXPORT_SYMBOL(transport_init_session);
252
253/*
140854cb 254 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 255 */
256void __transport_register_session(
257 struct se_portal_group *se_tpg,
258 struct se_node_acl *se_nacl,
259 struct se_session *se_sess,
260 void *fabric_sess_ptr)
261{
262 unsigned char buf[PR_REG_ISID_LEN];
263
264 se_sess->se_tpg = se_tpg;
265 se_sess->fabric_sess_ptr = fabric_sess_ptr;
266 /*
267 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
268 *
269 * Only set for struct se_session's that will actually be moving I/O.
270 * eg: *NOT* discovery sessions.
271 */
272 if (se_nacl) {
273 /*
274 * If the fabric module supports an ISID based TransportID,
275 * save this value in binary from the fabric I_T Nexus now.
276 */
e3d6f909 277 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 278 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 279 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 280 &buf[0], PR_REG_ISID_LEN);
281 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
282 }
afb999ff
NB		 283 kref_get(&se_nacl->acl_kref);
284
c66ac9db
NB		 285 spin_lock_irq(&se_nacl->nacl_sess_lock);
286 /*
287 * The se_nacl->nacl_sess pointer will be set to the
288 * last active I_T Nexus for each struct se_node_acl.
289 */
290 se_nacl->nacl_sess = se_sess;
291
292 list_add_tail(&se_sess->sess_acl_list,
293 &se_nacl->acl_sess_list);
294 spin_unlock_irq(&se_nacl->nacl_sess_lock);
295 }
296 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
297
6708bb27 298 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 299 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 300}
301EXPORT_SYMBOL(__transport_register_session);
302
303void transport_register_session(
304 struct se_portal_group *se_tpg,
305 struct se_node_acl *se_nacl,
306 struct se_session *se_sess,
307 void *fabric_sess_ptr)
308{
140854cb
NB		 309 unsigned long flags;
310
311 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 312 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 313 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 314}
315EXPORT_SYMBOL(transport_register_session);
316
4149268e 317void target_release_session(struct kref *kref)
41ac82b6
NB		 318{
319 struct se_session *se_sess = container_of(kref,
320 struct se_session, sess_kref);
321 struct se_portal_group *se_tpg = se_sess->se_tpg;
322
323 se_tpg->se_tpg_tfo->close_session(se_sess);
324}
325
326void target_get_session(struct se_session *se_sess)
327{
328 kref_get(&se_sess->sess_kref);
329}
330EXPORT_SYMBOL(target_get_session);
331
33933a0e 332void target_put_session(struct se_session *se_sess)
41ac82b6 333{
4149268e
JE		 334 struct se_portal_group *tpg = se_sess->se_tpg;
335
336 if (tpg->se_tpg_tfo->put_session != NULL) {
337 tpg->se_tpg_tfo->put_session(se_sess);
338 return;
339 }
33933a0e 340 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 341}
342EXPORT_SYMBOL(target_put_session);
343
afb999ff
NB		 344static void target_complete_nacl(struct kref *kref)
345{
346 struct se_node_acl *nacl = container_of(kref,
347 struct se_node_acl, acl_kref);
348
349 complete(&nacl->acl_free_comp);
350}
351
352void target_put_nacl(struct se_node_acl *nacl)
353{
354 kref_put(&nacl->acl_kref, target_complete_nacl);
355}
356
c66ac9db
NB		 357void transport_deregister_session_configfs(struct se_session *se_sess)
358{
359 struct se_node_acl *se_nacl;
23388864 360 unsigned long flags;
c66ac9db
NB		 361 /*
362 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
363 */
364 se_nacl = se_sess->se_node_acl;
6708bb27 365 if (se_nacl) {
23388864 366 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 367 if (se_nacl->acl_stop == 0)
368 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 369 /*
370 * If the session list is empty, then clear the pointer.
371 * Otherwise, set the struct se_session pointer from the tail
372 * element of the per struct se_node_acl active session list.
373 */
374 if (list_empty(&se_nacl->acl_sess_list))
375 se_nacl->nacl_sess = NULL;
376 else {
377 se_nacl->nacl_sess = container_of(
378 se_nacl->acl_sess_list.prev,
379 struct se_session, sess_acl_list);
380 }
23388864 381 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 382 }
383}
384EXPORT_SYMBOL(transport_deregister_session_configfs);
385
386void transport_free_session(struct se_session *se_sess)
387{
388 kmem_cache_free(se_sess_cache, se_sess);
389}
390EXPORT_SYMBOL(transport_free_session);
391
392void transport_deregister_session(struct se_session *se_sess)
393{
394 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 395 struct target_core_fabric_ops *se_tfo;
c66ac9db 396 struct se_node_acl *se_nacl;
e63a8e19 397 unsigned long flags;
01468346 398 bool comp_nacl = true;
c66ac9db 399
6708bb27 400 if (!se_tpg) {
c66ac9db
NB		 401 transport_free_session(se_sess);
402 return;
403 }
01468346 404 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 405
e63a8e19 406 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 407 list_del(&se_sess->sess_list);
408 se_sess->se_tpg = NULL;
409 se_sess->fabric_sess_ptr = NULL;
e63a8e19 410 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 411
412 /*
413 * Determine if we need to do extra work for this initiator node's
414 * struct se_node_acl if it had been previously dynamically generated.
415 */
416 se_nacl = se_sess->se_node_acl;
01468346
NB		 417
418 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
419 if (se_nacl && se_nacl->dynamic_node_acl) {
420 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
421 list_del(&se_nacl->acl_list);
422 se_tpg->num_node_acls--;
423 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
424 core_tpg_wait_for_nacl_pr_ref(se_nacl);
425 core_free_device_list_for_node(se_nacl, se_tpg);
426 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
427
428 comp_nacl = false;
429 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 430 }
c66ac9db 431 }
01468346 432 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 433
6708bb27 434 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 435 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 436 /*
afb999ff
NB		 437 * If last kref is dropping now for an explict NodeACL, awake sleeping
438 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
439 * removal context.
01468346
NB		 440 */
441 if (se_nacl && comp_nacl == true)
afb999ff 442 target_put_nacl(se_nacl);
01468346 443
afb999ff 444 transport_free_session(se_sess);
c66ac9db
NB		 445}
446EXPORT_SYMBOL(transport_deregister_session);
447
448/*
a1d8b49a 449 * Called with cmd->t_state_lock held.
c66ac9db 450 */
cf572a96 451static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 452{
42bf829e 453 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 454 unsigned long flags;
455
42bf829e
CH		 456 if (!dev)
457 return;
c66ac9db 458
cf572a96
CH		 459 if (cmd->transport_state & CMD_T_BUSY)
460 return;
c66ac9db 461
cf572a96
CH		 462 spin_lock_irqsave(&dev->execute_task_lock, flags);
463 if (cmd->state_active) {
464 list_del(&cmd->state_list);
cf572a96 465 cmd->state_active = false;
c66ac9db 466 }
cf572a96 467 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 468}
469
470/* transport_cmd_check_stop():
471 *
7d680f3b 472 * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
c66ac9db
NB		 473 * 'transport_off = 2' determines if task_dev_state should be removed.
474 *
475 * A non-zero u8 t_state sets cmd->t_state.
476 * Returns 1 when command is stopped, else 0.
477 */
478static int transport_cmd_check_stop(
479 struct se_cmd *cmd,
480 int transport_off,
481 u8 t_state)
482{
483 unsigned long flags;
484
a1d8b49a 485 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 486 /*
487 * Determine if IOCTL context caller in requesting the stopping of this
488 * command for LUN shutdown purposes.
489 */
7d680f3b
CH		 490 if (cmd->transport_state & CMD_T_LUN_STOP) {
491 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
492 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 493
7d680f3b 494 cmd->transport_state &= ~CMD_T_ACTIVE;
c66ac9db 495 if (transport_off == 2)
cf572a96 496 target_remove_from_state_list(cmd);
a1d8b49a 497 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 498
a1d8b49a 499 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 500 return 1;
501 }
502 /*
503 * Determine if frontend context caller is requesting the stopping of
e3d6f909 504 * this command for frontend exceptions.
c66ac9db 505 */
7d680f3b
CH		 506 if (cmd->transport_state & CMD_T_STOP) {
507 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
508 __func__, __LINE__,
e3d6f909 509 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 510
c66ac9db 511 if (transport_off == 2)
cf572a96 512 target_remove_from_state_list(cmd);
c66ac9db
NB		 513
514 /*
515 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
516 * to FE.
517 */
518 if (transport_off == 2)
519 cmd->se_lun = NULL;
a1d8b49a 520 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 521
a1d8b49a 522 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 523 return 1;
524 }
525 if (transport_off) {
7d680f3b 526 cmd->transport_state &= ~CMD_T_ACTIVE;
c66ac9db 527 if (transport_off == 2) {
cf572a96 528 target_remove_from_state_list(cmd);
c66ac9db
NB		 529 /*
530 * Clear struct se_cmd->se_lun before the transport_off == 2
531 * handoff to fabric module.
532 */
533 cmd->se_lun = NULL;
534 /*
535 * Some fabric modules like tcm_loop can release
25985edc 536 * their internally allocated I/O reference now and
c66ac9db 537 * struct se_cmd now.
88dd9e26
NB		 538 *
539 * Fabric modules are expected to return '1' here if the
540 * se_cmd being passed is released at this point,
541 * or zero if not being released.
c66ac9db 542 */
e3d6f909 543 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 544 spin_unlock_irqrestore(
a1d8b49a 545 &cmd->t_state_lock, flags);
c66ac9db 546
88dd9e26 547 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 548 }
549 }
a1d8b49a 550 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 551
552 return 0;
553 } else if (t_state)
554 cmd->t_state = t_state;
a1d8b49a 555 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 556
557 return 0;
558}
559
560static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
561{
562 return transport_cmd_check_stop(cmd, 2, 0);
563}
564
565static void transport_lun_remove_cmd(struct se_cmd *cmd)
566{
e3d6f909 567 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 568 unsigned long flags;
569
570 if (!lun)
571 return;
572
a1d8b49a 573 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 574 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
575 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 576 target_remove_from_state_list(cmd);
c66ac9db 577 }
a1d8b49a 578 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 579
c66ac9db 580 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 581 if (!list_empty(&cmd->se_lun_node))
582 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 583 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
584}
585
586void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
587{
c8e31f26 588 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
8dc52b54 589 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 590
591 if (transport_cmd_check_stop_to_fabric(cmd))
592 return;
77039d1e 593 if (remove) {
3df8d40b 594 transport_remove_cmd_from_queue(cmd);
e6a2573f 595 transport_put_cmd(cmd);
77039d1e 596 }
c66ac9db
NB		 597}
598
f7a5cc0b
CH		 599static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
600 bool at_head)
c66ac9db
NB		 601{
602 struct se_device *dev = cmd->se_dev;
e3d6f909 603 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 604 unsigned long flags;
605
c66ac9db 606 if (t_state) {
a1d8b49a 607 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 608 cmd->t_state = t_state;
7d680f3b 609 cmd->transport_state |= CMD_T_ACTIVE;
a1d8b49a 610 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 611 }
612
613 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 614
615 /* If the cmd is already on the list, remove it before we add it */
616 if (!list_empty(&cmd->se_queue_node))
617 list_del(&cmd->se_queue_node);
618 else
619 atomic_inc(&qobj->queue_cnt);
620
f7a5cc0b 621 if (at_head)
07bde79a 622 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 623 else
07bde79a 624 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
7d680f3b 625 cmd->transport_state |= CMD_T_QUEUED;
c66ac9db
NB		 626 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
627
c66ac9db 628 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 629}
630
5951146d
AG		 631static struct se_cmd *
632transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 633{
5951146d 634 struct se_cmd *cmd;
c66ac9db
NB		 635 unsigned long flags;
636
637 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
638 if (list_empty(&qobj->qobj_list)) {
639 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
640 return NULL;
641 }
5951146d 642 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 643
7d680f3b 644 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2 645 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 646 atomic_dec(&qobj->queue_cnt);
647 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
648
5951146d 649 return cmd;
c66ac9db
NB		 650}
651
3df8d40b 652static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 653{
3df8d40b 654 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 655 unsigned long flags;
656
657 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
7d680f3b 658 if (!(cmd->transport_state & CMD_T_QUEUED)) {
c66ac9db
NB		 659 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
660 return;
661 }
7d680f3b 662 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2
RD		 663 atomic_dec(&qobj->queue_cnt);
664 list_del_init(&cmd->se_queue_node);
c66ac9db 665 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
c66ac9db
NB		 666}
667
35e0e757
CH		 668static void target_complete_failure_work(struct work_struct *work)
669{
670 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
671
03e98c9e 672 transport_generic_request_failure(cmd);
35e0e757
CH		 673}
674
5787cacd 675void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 676{
42bf829e 677 struct se_device *dev = cmd->se_dev;
5787cacd 678 int success = scsi_status == GOOD;
c66ac9db 679 unsigned long flags;
c66ac9db 680
5787cacd
CH		 681 cmd->scsi_status = scsi_status;
682
683
a1d8b49a 684 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 685 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 686
c66ac9db 687 if (dev && dev->transport->transport_complete) {
5787cacd
CH		 688 if (dev->transport->transport_complete(cmd,
689 cmd->t_data_sg) != 0) {
c66ac9db 690 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
c66ac9db
NB		 691 success = 1;
692 }
693 }
694
695 /*
5787cacd 696 * See if we are waiting to complete for an exception condition.
c66ac9db 697 */
cf572a96 698 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 699 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 700 complete(&cmd->task_stop_comp);
c66ac9db
NB		 701 return;
702 }
2235007c
CH		 703
704 if (!success)
7d680f3b 705 cmd->transport_state |= CMD_T_FAILED;
2235007c 706
3d28934a
NB		 707 /*
708 * Check for case where an explict ABORT_TASK has been received
709 * and transport_wait_for_tasks() will be waiting for completion..
710 */
711 if (cmd->transport_state & CMD_T_ABORTED &&
712 cmd->transport_state & CMD_T_STOP) {
713 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
714 complete(&cmd->t_transport_stop_comp);
715 return;
716 } else if (cmd->transport_state & CMD_T_FAILED) {
41e16e98 717 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 718 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 719 } else {
35e0e757 720 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 721 }
35e0e757 722
35e0e757 723 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 724 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 725 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 726
35e0e757 727 queue_work(target_completion_wq, &cmd->work);
c66ac9db 728}
6bb35e00
CH		 729EXPORT_SYMBOL(target_complete_cmd);
730
cf572a96 731static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 732{
cf572a96
CH		 733 struct se_device *dev = cmd->se_dev;
734 unsigned long flags;
c66ac9db 735
cf572a96
CH		 736 spin_lock_irqsave(&dev->execute_task_lock, flags);
737 if (!cmd->state_active) {
738 list_add_tail(&cmd->state_list, &dev->state_list);
739 cmd->state_active = true;
c66ac9db 740 }
cf572a96 741 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 742}
743
07bde79a 744/*
f147abb4 745 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 746 */
747
748static void target_qf_do_work(struct work_struct *work)
749{
750 struct se_device *dev = container_of(work, struct se_device,
751 qf_work_queue);
bcac364a 752 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 753 struct se_cmd *cmd, *cmd_tmp;
754
755 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 756 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
757 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 758
bcac364a 759 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 760 list_del(&cmd->se_qf_node);
761 atomic_dec(&dev->dev_qf_count);
762 smp_mb__after_atomic_dec();
07bde79a 763
6708bb27 764 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 765 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 766 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 767 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
768 : "UNKNOWN");
f7a5cc0b
CH		 769
770 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 771 }
07bde79a
NB		 772}
773
c66ac9db
NB		 774unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
775{
776 switch (cmd->data_direction) {
777 case DMA_NONE:
778 return "NONE";
779 case DMA_FROM_DEVICE:
780 return "READ";
781 case DMA_TO_DEVICE:
782 return "WRITE";
783 case DMA_BIDIRECTIONAL:
784 return "BIDI";
785 default:
786 break;
787 }
788
789 return "UNKNOWN";
790}
791
792void transport_dump_dev_state(
793 struct se_device *dev,
794 char *b,
795 int *bl)
796{
797 *bl += sprintf(b + *bl, "Status: ");
798 switch (dev->dev_status) {
799 case TRANSPORT_DEVICE_ACTIVATED:
800 *bl += sprintf(b + *bl, "ACTIVATED");
801 break;
802 case TRANSPORT_DEVICE_DEACTIVATED:
803 *bl += sprintf(b + *bl, "DEACTIVATED");
804 break;
805 case TRANSPORT_DEVICE_SHUTDOWN:
806 *bl += sprintf(b + *bl, "SHUTDOWN");
807 break;
808 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
809 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
810 *bl += sprintf(b + *bl, "OFFLINE");
811 break;
812 default:
813 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
814 break;
815 }
816
5f41a31d 817 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd
NB		 818 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
819 dev->se_sub_dev->se_dev_attrib.block_size,
820 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
c66ac9db
NB		 821 *bl += sprintf(b + *bl, " ");
822}
823
c66ac9db
NB		 824void transport_dump_vpd_proto_id(
825 struct t10_vpd *vpd,
826 unsigned char *p_buf,
827 int p_buf_len)
828{
829 unsigned char buf[VPD_TMP_BUF_SIZE];
830 int len;
831
832 memset(buf, 0, VPD_TMP_BUF_SIZE);
833 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
834
835 switch (vpd->protocol_identifier) {
836 case 0x00:
837 sprintf(buf+len, "Fibre Channel\n");
838 break;
839 case 0x10:
840 sprintf(buf+len, "Parallel SCSI\n");
841 break;
842 case 0x20:
843 sprintf(buf+len, "SSA\n");
844 break;
845 case 0x30:
846 sprintf(buf+len, "IEEE 1394\n");
847 break;
848 case 0x40:
849 sprintf(buf+len, "SCSI Remote Direct Memory Access"
850 " Protocol\n");
851 break;
852 case 0x50:
853 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
854 break;
855 case 0x60:
856 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
857 break;
858 case 0x70:
859 sprintf(buf+len, "Automation/Drive Interface Transport"
860 " Protocol\n");
861 break;
862 case 0x80:
863 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
864 break;
865 default:
866 sprintf(buf+len, "Unknown 0x%02x\n",
867 vpd->protocol_identifier);
868 break;
869 }
870
871 if (p_buf)
872 strncpy(p_buf, buf, p_buf_len);
873 else
6708bb27 874 pr_debug("%s", buf);
c66ac9db
NB		 875}
876
877void
878transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
879{
880 /*
881 * Check if the Protocol Identifier Valid (PIV) bit is set..
882 *
883 * from spc3r23.pdf section 7.5.1
884 */
885 if (page_83[1] & 0x80) {
886 vpd->protocol_identifier = (page_83[0] & 0xf0);
887 vpd->protocol_identifier_set = 1;
888 transport_dump_vpd_proto_id(vpd, NULL, 0);
889 }
890}
891EXPORT_SYMBOL(transport_set_vpd_proto_id);
892
893int transport_dump_vpd_assoc(
894 struct t10_vpd *vpd,
895 unsigned char *p_buf,
896 int p_buf_len)
897{
898 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 899 int ret = 0;
900 int len;
c66ac9db
NB		 901
902 memset(buf, 0, VPD_TMP_BUF_SIZE);
903 len = sprintf(buf, "T10 VPD Identifier Association: ");
904
905 switch (vpd->association) {
906 case 0x00:
907 sprintf(buf+len, "addressed logical unit\n");
908 break;
909 case 0x10:
910 sprintf(buf+len, "target port\n");
911 break;
912 case 0x20:
913 sprintf(buf+len, "SCSI target device\n");
914 break;
915 default:
916 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 917 ret = -EINVAL;
c66ac9db
NB		 918 break;
919 }
920
921 if (p_buf)
922 strncpy(p_buf, buf, p_buf_len);
923 else
6708bb27 924 pr_debug("%s", buf);
c66ac9db
NB		 925
926 return ret;
927}
928
929int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
930{
931 /*
932 * The VPD identification association..
933 *
934 * from spc3r23.pdf Section 7.6.3.1 Table 297
935 */
936 vpd->association = (page_83[1] & 0x30);
937 return transport_dump_vpd_assoc(vpd, NULL, 0);
938}
939EXPORT_SYMBOL(transport_set_vpd_assoc);
940
941int transport_dump_vpd_ident_type(
942 struct t10_vpd *vpd,
943 unsigned char *p_buf,
944 int p_buf_len)
945{
946 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 947 int ret = 0;
948 int len;
c66ac9db
NB		 949
950 memset(buf, 0, VPD_TMP_BUF_SIZE);
951 len = sprintf(buf, "T10 VPD Identifier Type: ");
952
953 switch (vpd->device_identifier_type) {
954 case 0x00:
955 sprintf(buf+len, "Vendor specific\n");
956 break;
957 case 0x01:
958 sprintf(buf+len, "T10 Vendor ID based\n");
959 break;
960 case 0x02:
961 sprintf(buf+len, "EUI-64 based\n");
962 break;
963 case 0x03:
964 sprintf(buf+len, "NAA\n");
965 break;
966 case 0x04:
967 sprintf(buf+len, "Relative target port identifier\n");
968 break;
969 case 0x08:
970 sprintf(buf+len, "SCSI name string\n");
971 break;
972 default:
973 sprintf(buf+len, "Unsupported: 0x%02x\n",
974 vpd->device_identifier_type);
e3d6f909 975 ret = -EINVAL;
c66ac9db
NB		 976 break;
977 }
978
e3d6f909
AG		 979 if (p_buf) {
980 if (p_buf_len < strlen(buf)+1)
981 return -EINVAL;
c66ac9db 982 strncpy(p_buf, buf, p_buf_len);
e3d6f909 983 } else {
6708bb27 984 pr_debug("%s", buf);
e3d6f909 985 }
c66ac9db
NB		 986
987 return ret;
988}
989
990int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
991{
992 /*
993 * The VPD identifier type..
994 *
995 * from spc3r23.pdf Section 7.6.3.1 Table 298
996 */
997 vpd->device_identifier_type = (page_83[1] & 0x0f);
998 return transport_dump_vpd_ident_type(vpd, NULL, 0);
999}
1000EXPORT_SYMBOL(transport_set_vpd_ident_type);
1001
1002int transport_dump_vpd_ident(
1003 struct t10_vpd *vpd,
1004 unsigned char *p_buf,
1005 int p_buf_len)
1006{
1007 unsigned char buf[VPD_TMP_BUF_SIZE];
1008 int ret = 0;
1009
1010 memset(buf, 0, VPD_TMP_BUF_SIZE);
1011
1012 switch (vpd->device_identifier_code_set) {
1013 case 0x01: /* Binary */
1014 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1015 &vpd->device_identifier[0]);
1016 break;
1017 case 0x02: /* ASCII */
1018 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1019 &vpd->device_identifier[0]);
1020 break;
1021 case 0x03: /* UTF-8 */
1022 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1023 &vpd->device_identifier[0]);
1024 break;
1025 default:
1026 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1027 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1028 ret = -EINVAL;
c66ac9db
NB		 1029 break;
1030 }
1031
1032 if (p_buf)
1033 strncpy(p_buf, buf, p_buf_len);
1034 else
6708bb27 1035 pr_debug("%s", buf);
c66ac9db
NB		 1036
1037 return ret;
1038}
1039
1040int
1041transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1042{
1043 static const char hex_str[] = "0123456789abcdef";
1044 int j = 0, i = 4; /* offset to start of the identifer */
1045
1046 /*
1047 * The VPD Code Set (encoding)
1048 *
1049 * from spc3r23.pdf Section 7.6.3.1 Table 296
1050 */
1051 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1052 switch (vpd->device_identifier_code_set) {
1053 case 0x01: /* Binary */
1054 vpd->device_identifier[j++] =
1055 hex_str[vpd->device_identifier_type];
1056 while (i < (4 + page_83[3])) {
1057 vpd->device_identifier[j++] =
1058 hex_str[(page_83[i] & 0xf0) >> 4];
1059 vpd->device_identifier[j++] =
1060 hex_str[page_83[i] & 0x0f];
1061 i++;
1062 }
1063 break;
1064 case 0x02: /* ASCII */
1065 case 0x03: /* UTF-8 */
1066 while (i < (4 + page_83[3]))
1067 vpd->device_identifier[j++] = page_83[i++];
1068 break;
1069 default:
1070 break;
1071 }
1072
1073 return transport_dump_vpd_ident(vpd, NULL, 0);
1074}
1075EXPORT_SYMBOL(transport_set_vpd_ident);
1076
1077static void core_setup_task_attr_emulation(struct se_device *dev)
1078{
1079 /*
1080 * If this device is from Target_Core_Mod/pSCSI, disable the
1081 * SAM Task Attribute emulation.
1082 *
1083 * This is currently not available in upsream Linux/SCSI Target
1084 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1085 */
e3d6f909 1086 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1087 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1088 return;
1089 }
1090
1091 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1092 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1093 " device\n", dev->transport->name,
1094 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1095}
1096
1097static void scsi_dump_inquiry(struct se_device *dev)
1098{
e3d6f909 1099 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1100 char buf[17];
c66ac9db
NB		 1101 int i, device_type;
1102 /*
1103 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1104 */
c66ac9db
NB		 1105 for (i = 0; i < 8; i++)
1106 if (wwn->vendor[i] >= 0x20)
e59a41b6 1107 buf[i] = wwn->vendor[i];
c66ac9db 1108 else
e59a41b6
SAS		 1109 buf[i] = ' ';
1110 buf[i] = '\0';
1111 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1112
c66ac9db
NB		 1113 for (i = 0; i < 16; i++)
1114 if (wwn->model[i] >= 0x20)
e59a41b6 1115 buf[i] = wwn->model[i];
c66ac9db 1116 else
e59a41b6
SAS		 1117 buf[i] = ' ';
1118 buf[i] = '\0';
1119 pr_debug(" Model: %s\n", buf);
c66ac9db 1120
c66ac9db
NB		 1121 for (i = 0; i < 4; i++)
1122 if (wwn->revision[i] >= 0x20)
e59a41b6 1123 buf[i] = wwn->revision[i];
c66ac9db 1124 else
e59a41b6
SAS		 1125 buf[i] = ' ';
1126 buf[i] = '\0';
1127 pr_debug(" Revision: %s\n", buf);
c66ac9db 1128
e3d6f909 1129 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1130 pr_debug(" Type: %s ", scsi_device_type(device_type));
1131 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1132 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1133}
1134
1135struct se_device *transport_add_device_to_core_hba(
1136 struct se_hba *hba,
1137 struct se_subsystem_api *transport,
1138 struct se_subsystem_dev *se_dev,
1139 u32 device_flags,
1140 void *transport_dev,
1141 struct se_dev_limits *dev_limits,
1142 const char *inquiry_prod,
1143 const char *inquiry_rev)
1144{
12a18bdc 1145 int force_pt;
c66ac9db
NB		 1146 struct se_device *dev;
1147
1148 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1149 if (!dev) {
1150 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1151 return NULL;
1152 }
c66ac9db 1153
e3d6f909 1154 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1155 dev->dev_flags = device_flags;
1156 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1157 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1158 dev->se_hba = hba;
1159 dev->se_sub_dev = se_dev;
1160 dev->transport = transport;
c66ac9db
NB		 1161 INIT_LIST_HEAD(&dev->dev_list);
1162 INIT_LIST_HEAD(&dev->dev_sep_list);
1163 INIT_LIST_HEAD(&dev->dev_tmr_list);
c66ac9db 1164 INIT_LIST_HEAD(&dev->delayed_cmd_list);
cf572a96 1165 INIT_LIST_HEAD(&dev->state_list);
07bde79a 1166 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1167 spin_lock_init(&dev->execute_task_lock);
1168 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1169 spin_lock_init(&dev->dev_reservation_lock);
1170 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1171 spin_lock_init(&dev->se_port_lock);
1172 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1173 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1174 atomic_set(&dev->dev_ordered_id, 0);
1175
1176 se_dev_set_default_attribs(dev, dev_limits);
1177
1178 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1179 dev->creation_time = get_jiffies_64();
1180 spin_lock_init(&dev->stats_lock);
1181
1182 spin_lock(&hba->device_lock);
1183 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1184 hba->dev_count++;
1185 spin_unlock(&hba->device_lock);
1186 /*
1187 * Setup the SAM Task Attribute emulation for struct se_device
1188 */
1189 core_setup_task_attr_emulation(dev);
1190 /*
1191 * Force PR and ALUA passthrough emulation with internal object use.
1192 */
1193 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1194 /*
1195 * Setup the Reservations infrastructure for struct se_device
1196 */
1197 core_setup_reservations(dev, force_pt);
1198 /*
1199 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1200 */
1201 if (core_setup_alua(dev, force_pt) < 0)
1202 goto out;
1203
1204 /*
1205 * Startup the struct se_device processing thread
1206 */
1207 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1208 "LIO_%s", dev->transport->name);
c66ac9db 1209 if (IS_ERR(dev->process_thread)) {
6708bb27 1210 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1211 dev->transport->name);
c66ac9db
NB		 1212 goto out;
1213 }
07bde79a
NB		 1214 /*
1215 * Setup work_queue for QUEUE_FULL
1216 */
1217 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1218 /*
1219 * Preload the initial INQUIRY const values if we are doing
1220 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1221 * passthrough because this is being provided by the backend LLD.
1222 * This is required so that transport_get_inquiry() copies these
1223 * originals once back into DEV_T10_WWN(dev) for the virtual device
1224 * setup.
1225 */
e3d6f909 1226 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1227 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1228 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1229 " INQUIRY consts\n");
1230 goto out;
1231 }
1232
e3d6f909
AG		 1233 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1234 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1235 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1236 }
1237 scsi_dump_inquiry(dev);
1238
12a18bdc 1239 return dev;
c66ac9db 1240out:
c66ac9db
NB		 1241 kthread_stop(dev->process_thread);
1242
1243 spin_lock(&hba->device_lock);
1244 list_del(&dev->dev_list);
1245 hba->dev_count--;
1246 spin_unlock(&hba->device_lock);
1247
1248 se_release_vpd_for_dev(dev);
1249
c66ac9db
NB		 1250 kfree(dev);
1251
1252 return NULL;
1253}
1254EXPORT_SYMBOL(transport_add_device_to_core_hba);
1255
1fd032ee 1256int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1257{
1258 struct se_device *dev = cmd->se_dev;
1259
1260 if (cmd->unknown_data_length) {
1261 cmd->data_length = size;
1262 } else if (size != cmd->data_length) {
1263 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1264 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1265 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1266 cmd->data_length, size, cmd->t_task_cdb[0]);
1267
1268 cmd->cmd_spdtl = size;
1269
1270 if (cmd->data_direction == DMA_TO_DEVICE) {
1271 pr_err("Rejecting underflow/overflow"
1272 " WRITE data\n");
1273 goto out_invalid_cdb_field;
1274 }
1275 /*
1276 * Reject READ_* or WRITE_* with overflow/underflow for
1277 * type SCF_SCSI_DATA_CDB.
1278 */
1279 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
1280 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1281 " CDB on non 512-byte sector setup subsystem"
1282 " plugin: %s\n", dev->transport->name);
1283 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1284 goto out_invalid_cdb_field;
1285 }
1286
1287 if (size > cmd->data_length) {
1288 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1289 cmd->residual_count = (size - cmd->data_length);
1290 } else {
1291 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1292 cmd->residual_count = (cmd->data_length - size);
1293 }
1294 cmd->data_length = size;
1295 }
1296
1297 return 0;
1298
1299out_invalid_cdb_field:
1300 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1301 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1302 return -EINVAL;
1303}
1304
c66ac9db
NB		 1305/*
1306 * Used by fabric modules containing a local struct se_cmd within their
1307 * fabric dependent per I/O descriptor.
1308 */
1309void transport_init_se_cmd(
1310 struct se_cmd *cmd,
1311 struct target_core_fabric_ops *tfo,
1312 struct se_session *se_sess,
1313 u32 data_length,
1314 int data_direction,
1315 int task_attr,
1316 unsigned char *sense_buffer)
1317{
5951146d
AG		 1318 INIT_LIST_HEAD(&cmd->se_lun_node);
1319 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1320 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1321 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1322 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1323 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1324 init_completion(&cmd->transport_lun_fe_stop_comp);
1325 init_completion(&cmd->transport_lun_stop_comp);
1326 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1327 init_completion(&cmd->cmd_wait_comp);
cf572a96 1328 init_completion(&cmd->task_stop_comp);
a1d8b49a 1329 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1330 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1331
1332 cmd->se_tfo = tfo;
1333 cmd->se_sess = se_sess;
1334 cmd->data_length = data_length;
1335 cmd->data_direction = data_direction;
1336 cmd->sam_task_attr = task_attr;
1337 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1338
1339 cmd->state_active = false;
c66ac9db
NB		 1340}
1341EXPORT_SYMBOL(transport_init_se_cmd);
1342
1343static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1344{
1345 /*
1346 * Check if SAM Task Attribute emulation is enabled for this
1347 * struct se_device storage object
1348 */
5951146d 1349 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1350 return 0;
1351
e66ecd50 1352 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1353 pr_debug("SAM Task Attribute ACA"
c66ac9db 1354 " emulation is not supported\n");
e3d6f909 1355 return -EINVAL;
c66ac9db
NB		 1356 }
1357 /*
1358 * Used to determine when ORDERED commands should go from
1359 * Dormant to Active status.
1360 */
5951146d 1361 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1362 smp_mb__after_atomic_inc();
6708bb27 1363 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1364 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1365 cmd->se_dev->transport->name);
c66ac9db
NB		 1366 return 0;
1367}
1368
a12f41f8 1369/* target_setup_cmd_from_cdb():
c66ac9db
NB		 1370 *
1371 * Called from fabric RX Thread.
1372 */
a12f41f8 1373int target_setup_cmd_from_cdb(
c66ac9db
NB		 1374 struct se_cmd *cmd,
1375 unsigned char *cdb)
1376{
cb4f4d3c
CH		 1377 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1378 u32 pr_reg_type = 0;
1379 u8 alua_ascq = 0;
1380 unsigned long flags;
c66ac9db
NB		 1381 int ret;
1382
c66ac9db
NB		 1383 /*
1384 * Ensure that the received CDB is less than the max (252 + 8) bytes
1385 * for VARIABLE_LENGTH_CMD
1386 */
1387 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1388 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1389 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1390 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1391 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1392 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1393 return -EINVAL;
c66ac9db
NB		 1394 }
1395 /*
1396 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1397 * allocate the additional extended CDB buffer now.. Otherwise
1398 * setup the pointer from __t_task_cdb to t_task_cdb.
1399 */
a1d8b49a
AG		 1400 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1401 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1402 GFP_KERNEL);
6708bb27
AG		 1403 if (!cmd->t_task_cdb) {
1404 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1405 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1406 scsi_command_size(cdb),
a1d8b49a 1407 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1408 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1409 cmd->scsi_sense_reason =
1410 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1411 return -ENOMEM;
c66ac9db
NB		 1412 }
1413 } else
a1d8b49a 1414 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1415 /*
a1d8b49a 1416 * Copy the original CDB into cmd->
c66ac9db 1417 */
a1d8b49a 1418 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1419
1420 /*
1421 * Check for an existing UNIT ATTENTION condition
1422 */
1423 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1424 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1425 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1426 return -EINVAL;
1427 }
1428
1429 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1430 if (ret != 0) {
1431 /*
1432 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1433 * The ALUA additional sense code qualifier (ASCQ) is determined
1434 * by the ALUA primary or secondary access state..
1435 */
1436 if (ret > 0) {
1437 pr_debug("[%s]: ALUA TG Port not available, "
1438 "SenseKey: NOT_READY, ASC/ASCQ: "
1439 "0x04/0x%02x\n",
1440 cmd->se_tfo->get_fabric_name(), alua_ascq);
1441
1442 transport_set_sense_codes(cmd, 0x04, alua_ascq);
1443 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1444 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1445 return -EINVAL;
1446 }
1447 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1448 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1449 return -EINVAL;
1450 }
1451
1452 /*
1453 * Check status for SPC-3 Persistent Reservations
1454 */
1455 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1456 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1457 cmd, cdb, pr_reg_type) != 0) {
1458 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1459 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1460 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1461 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1462 return -EBUSY;
1463 }
1464 /*
1465 * This means the CDB is allowed for the SCSI Initiator port
1466 * when said port is *NOT* holding the legacy SPC-2 or
1467 * SPC-3 Persistent Reservation.
1468 */
1469 }
1470
1fd032ee 1471 ret = cmd->se_dev->transport->parse_cdb(cmd);
c66ac9db
NB		 1472 if (ret < 0)
1473 return ret;
cb4f4d3c
CH		 1474
1475 spin_lock_irqsave(&cmd->t_state_lock, flags);
1476 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1477 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1478
c66ac9db
NB		 1479 /*
1480 * Check for SAM Task Attribute Emulation
1481 */
1482 if (transport_check_alloc_task_attr(cmd) < 0) {
1483 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1484 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1485 return -EINVAL;
c66ac9db
NB		 1486 }
1487 spin_lock(&cmd->se_lun->lun_sep_lock);
1488 if (cmd->se_lun->lun_sep)
1489 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1490 spin_unlock(&cmd->se_lun->lun_sep_lock);
1491 return 0;
1492}
a12f41f8 1493EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1494
695434e1
NB		 1495/*
1496 * Used by fabric module frontends to queue tasks directly.
1497 * Many only be used from process context only
1498 */
1499int transport_handle_cdb_direct(
1500 struct se_cmd *cmd)
1501{
dd8ae59d
NB		 1502 int ret;
1503
695434e1
NB		 1504 if (!cmd->se_lun) {
1505 dump_stack();
6708bb27 1506 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1507 return -EINVAL;
1508 }
1509 if (in_interrupt()) {
1510 dump_stack();
6708bb27 1511 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1512 " from interrupt context\n");
1513 return -EINVAL;
1514 }
dd8ae59d 1515 /*
7d680f3b 1516 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
dd8ae59d
NB		 1517 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1518 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1519 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1520 *
1521 * Also, we don't take cmd->t_state_lock here as we only expect
1522 * this to be called for initial descriptor submission.
1523 */
1524 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1525 cmd->transport_state |= CMD_T_ACTIVE;
1526
dd8ae59d
NB		 1527 /*
1528 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1529 * so follow TRANSPORT_NEW_CMD processing thread context usage
1530 * and call transport_generic_request_failure() if necessary..
1531 */
1532 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1533 if (ret < 0)
1534 transport_generic_request_failure(cmd);
1535
dd8ae59d 1536 return 0;
695434e1
NB		 1537}
1538EXPORT_SYMBOL(transport_handle_cdb_direct);
1539
a6360785
NB		 1540/**
1541 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1542 *
1543 * @se_cmd: command descriptor to submit
1544 * @se_sess: associated se_sess for endpoint
1545 * @cdb: pointer to SCSI CDB
1546 * @sense: pointer to SCSI sense buffer
1547 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1548 * @data_length: fabric expected data transfer length
1549 * @task_addr: SAM task attribute
1550 * @data_dir: DMA data direction
1551 * @flags: flags for command submission from target_sc_flags_tables
1552 *
1553 * This may only be called from process context, and also currently
1554 * assumes internal allocation of fabric payload buffer by target-core.
1555 **/
1edcdb49 1556void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1557 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1558 u32 data_length, int task_attr, int data_dir, int flags)
1559{
1560 struct se_portal_group *se_tpg;
1561 int rc;
1562
1563 se_tpg = se_sess->se_tpg;
1564 BUG_ON(!se_tpg);
1565 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1566 BUG_ON(in_interrupt());
1567 /*
1568 * Initialize se_cmd for target operation. From this point
1569 * exceptions are handled by sending exception status via
1570 * target_core_fabric_ops->queue_status() callback
1571 */
1572 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1573 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1574 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1575 se_cmd->unknown_data_length = 1;
a6360785
NB		 1576 /*
1577 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1578 * se_sess->sess_cmd_list. A second kref_get here is necessary
1579 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1580 * kref_put() to happen during fabric packet acknowledgement.
1581 */
1582 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1583 /*
1584 * Signal bidirectional data payloads to target-core
1585 */
1586 if (flags & TARGET_SCF_BIDI_OP)
1587 se_cmd->se_cmd_flags |= SCF_BIDI;
1588 /*
1589 * Locate se_lun pointer and attach it to struct se_cmd
1590 */
735703ca
NB		 1591 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1592 transport_send_check_condition_and_sense(se_cmd,
1593 se_cmd->scsi_sense_reason, 0);
1594 target_put_sess_cmd(se_sess, se_cmd);
1595 return;
1596 }
d6e0175c 1597
a12f41f8 1598 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca
NB		 1599 if (rc != 0) {
1600 transport_generic_request_failure(se_cmd);
1601 return;
1602 }
11e319ed
AG		 1603
1604 /*
1605 * Check if we need to delay processing because of ALUA
1606 * Active/NonOptimized primary access state..
1607 */
1608 core_alua_check_nonop_delay(se_cmd);
1609
a6360785
NB		 1610 /*
1611 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1612 * for immediate execution of READs, otherwise wait for
1613 * transport_generic_handle_data() to be called for WRITEs
1614 * when fabric has filled the incoming buffer.
1615 */
1616 transport_handle_cdb_direct(se_cmd);
1edcdb49 1617 return;
a6360785
NB		 1618}
1619EXPORT_SYMBOL(target_submit_cmd);
1620
9f0d05c2
NB		 1621static void target_complete_tmr_failure(struct work_struct *work)
1622{
1623 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1624
1625 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1626 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1627 transport_generic_free_cmd(se_cmd, 0);
1628}
1629
ea98d7f9
AG		 1630/**
1631 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1632 * for TMR CDBs
1633 *
1634 * @se_cmd: command descriptor to submit
1635 * @se_sess: associated se_sess for endpoint
1636 * @sense: pointer to SCSI sense buffer
1637 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1638 * @fabric_context: fabric context for TMR req
1639 * @tm_type: Type of TM request
c0974f89
NB		 1640 * @gfp: gfp type for caller
1641 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1642 * @flags: submit cmd flags
ea98d7f9
AG		 1643 *
1644 * Callable from all contexts.
1645 **/
1646
c7042cae 1647int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1648 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1649 void *fabric_tmr_ptr, unsigned char tm_type,
1650 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1651{
1652 struct se_portal_group *se_tpg;
1653 int ret;
1654
1655 se_tpg = se_sess->se_tpg;
1656 BUG_ON(!se_tpg);
1657
1658 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1659 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1660 /*
1661 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1662 * allocation failure.
1663 */
c0974f89 1664 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1665 if (ret < 0)
1666 return -ENOMEM;
ea98d7f9 1667
c0974f89
NB		 1668 if (tm_type == TMR_ABORT_TASK)
1669 se_cmd->se_tmr_req->ref_task_tag = tag;
1670
ea98d7f9
AG		 1671 /* See target_submit_cmd for commentary */
1672 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1673
ea98d7f9
AG		 1674 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1675 if (ret) {
9f0d05c2
NB		 1676 /*
1677 * For callback during failure handling, push this work off
1678 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1679 */
1680 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1681 schedule_work(&se_cmd->work);
c7042cae 1682 return 0;
ea98d7f9
AG		 1683 }
1684 transport_generic_handle_tmr(se_cmd);
c7042cae 1685 return 0;
ea98d7f9
AG		 1686}
1687EXPORT_SYMBOL(target_submit_tmr);
1688
c66ac9db
NB		 1689/*
1690 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1691 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1692 * complete setup in TCM process context w/ TFO->new_cmd_map().
1693 */
1694int transport_generic_handle_cdb_map(
1695 struct se_cmd *cmd)
1696{
e3d6f909 1697 if (!cmd->se_lun) {
c66ac9db 1698 dump_stack();
6708bb27 1699 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1700 return -EINVAL;
c66ac9db
NB		 1701 }
1702
f7a5cc0b 1703 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1704 return 0;
1705}
1706EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1707
1708/* transport_generic_handle_data():
1709 *
1710 *
1711 */
1712int transport_generic_handle_data(
1713 struct se_cmd *cmd)
1714{
1715 /*
1716 * For the software fabric case, then we assume the nexus is being
1717 * failed/shutdown when signals are pending from the kthread context
1718 * caller, so we return a failure. For the HW target mode case running
1719 * in interrupt code, the signal_pending() check is skipped.
1720 */
1721 if (!in_interrupt() && signal_pending(current))
e3d6f909 1722 return -EPERM;
c66ac9db
NB		 1723 /*
1724 * If the received CDB has aleady been ABORTED by the generic
1725 * target engine, we now call transport_check_aborted_status()
1726 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1727 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1728 * sequences at this point.
1729 */
1730 if (transport_check_aborted_status(cmd, 1) != 0)
1731 return 0;
1732
f7a5cc0b 1733 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1734 return 0;
1735}
1736EXPORT_SYMBOL(transport_generic_handle_data);
1737
1738/* transport_generic_handle_tmr():
1739 *
1740 *
1741 */
1742int transport_generic_handle_tmr(
1743 struct se_cmd *cmd)
1744{
f7a5cc0b 1745 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1746 return 0;
1747}
1748EXPORT_SYMBOL(transport_generic_handle_tmr);
1749
cdbb70bb 1750/*
cf572a96 1751 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1752 * has completed.
1753 */
cf572a96 1754bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1755{
cdbb70bb
CH		 1756 bool was_active = false;
1757
cf572a96
CH		 1758 if (cmd->transport_state & CMD_T_BUSY) {
1759 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1760 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1761
cf572a96
CH		 1762 pr_debug("cmd %p waiting to complete\n", cmd);
1763 wait_for_completion(&cmd->task_stop_comp);
1764 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1765
1766 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1767 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1768 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1769 was_active = true;
1770 }
1771
cdbb70bb
CH		 1772 return was_active;
1773}
1774
c66ac9db
NB		 1775/*
1776 * Handle SAM-esque emulation for generic transport request failures.
1777 */
2fbff127 1778void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1779{
07bde79a
NB		 1780 int ret = 0;
1781
6708bb27 1782 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1783 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1784 cmd->t_task_cdb[0]);
03e98c9e 1785 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1786 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1787 cmd->t_state, cmd->scsi_sense_reason);
d43d6aea 1788 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1789 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1790 (cmd->transport_state & CMD_T_STOP) != 0,
1791 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1792
c66ac9db
NB		 1793 /*
1794 * For SAM Task Attribute emulation for failed struct se_cmd
1795 */
1796 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1797 transport_complete_task_attr(cmd);
1798
03e98c9e
NB		 1799 switch (cmd->scsi_sense_reason) {
1800 case TCM_NON_EXISTENT_LUN:
1801 case TCM_UNSUPPORTED_SCSI_OPCODE:
1802 case TCM_INVALID_CDB_FIELD:
1803 case TCM_INVALID_PARAMETER_LIST:
1804 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1805 case TCM_UNKNOWN_MODE_PAGE:
1806 case TCM_WRITE_PROTECTED:
1807 case TCM_CHECK_CONDITION_ABORT_CMD:
1808 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1809 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1810 break;
03e98c9e 1811 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1812 /*
1813 * No SENSE Data payload for this case, set SCSI Status
1814 * and queue the response to $FABRIC_MOD.
1815 *
1816 * Uses linux/include/scsi/scsi.h SAM status codes defs
1817 */
1818 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1819 /*
1820 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1821 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1822 * CONFLICT STATUS.
1823 *
1824 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1825 */
e3d6f909
AG		 1826 if (cmd->se_sess &&
1827 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1828 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1829 cmd->orig_fe_lun, 0x2C,
1830 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1831
07bde79a 1832 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1833 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1834 goto queue_full;
c66ac9db 1835 goto check_stop;
c66ac9db 1836 default:
6708bb27 1837 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1838 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1839 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1840 break;
1841 }
16ab8e60
NB		 1842 /*
1843 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1844 * make the call to transport_send_check_condition_and_sense()
1845 * directly. Otherwise expect the fabric to make the call to
1846 * transport_send_check_condition_and_sense() after handling
1847 * possible unsoliticied write data payloads.
1848 */
03e98c9e
NB		 1849 ret = transport_send_check_condition_and_sense(cmd,
1850 cmd->scsi_sense_reason, 0);
1851 if (ret == -EAGAIN || ret == -ENOMEM)
1852 goto queue_full;
07bde79a 1853
c66ac9db
NB		 1854check_stop:
1855 transport_lun_remove_cmd(cmd);
6708bb27 1856 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1857 ;
07bde79a
NB		 1858 return;
1859
1860queue_full:
e057f533
CH		 1861 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1862 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1863}
2fbff127 1864EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1865
5f41a31d 1866static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1867{
0c2ad7d1 1868 int error = 0;
5f41a31d
CH		 1869
1870 spin_lock_irq(&cmd->t_state_lock);
1871 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1872 spin_unlock_irq(&cmd->t_state_lock);
1873
1874 if (cmd->execute_cmd)
1875 error = cmd->execute_cmd(cmd);
5f41a31d
CH		 1876
1877 if (error) {
1878 spin_lock_irq(&cmd->t_state_lock);
1879 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1880 spin_unlock_irq(&cmd->t_state_lock);
1881
1882 transport_generic_request_failure(cmd);
1883 }
1884}
1885
1886static void target_execute_cmd(struct se_cmd *cmd)
1887{
1888 struct se_device *dev = cmd->se_dev;
1889
1890 if (transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING))
1891 return;
1892
1893 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1894 goto execute;
1895
c66ac9db 1896 /*
25985edc 1897 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1898 * to allow the passed struct se_cmd list of tasks to the front of the list.
1899 */
5f41a31d
CH		 1900 switch (cmd->sam_task_attr) {
1901 case MSG_HEAD_TAG:
1902 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1903 "se_ordered_id: %u\n",
1904 cmd->t_task_cdb[0], cmd->se_ordered_id);
1905 goto execute;
1906 case MSG_ORDERED_TAG:
1907 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1908 smp_mb__after_atomic_inc();
1909
5f41a31d
CH		 1910 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1911 " se_ordered_id: %u\n",
1912 cmd->t_task_cdb[0], cmd->se_ordered_id);
1913
c66ac9db 1914 /*
5f41a31d
CH		 1915 * Execute an ORDERED command if no other older commands
1916 * exist that need to be completed first.
c66ac9db 1917 */
5f41a31d
CH		 1918 if (!atomic_read(&dev->simple_cmds))
1919 goto execute;
1920 break;
1921 default:
c66ac9db
NB		 1922 /*
1923 * For SIMPLE and UNTAGGED Task Attribute commands
1924 */
5f41a31d 1925 atomic_inc(&dev->simple_cmds);
c66ac9db 1926 smp_mb__after_atomic_inc();
5f41a31d 1927 break;
c66ac9db 1928 }
5f41a31d
CH		 1929
1930 if (atomic_read(&dev->dev_ordered_sync) != 0) {
1931 spin_lock(&dev->delayed_cmd_lock);
5f41a31d
CH		 1932 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1933 spin_unlock(&dev->delayed_cmd_lock);
c66ac9db 1934
6708bb27 1935 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 1936 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 1937 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db 1938 cmd->se_ordered_id);
5f41a31d 1939 return;
c66ac9db 1940 }
c66ac9db 1941
5f41a31d 1942execute:
c66ac9db 1943 /*
5f41a31d 1944 * Otherwise, no ORDERED task attributes exist..
c66ac9db 1945 */
5f41a31d 1946 __target_execute_cmd(cmd);
c66ac9db
NB		 1947}
1948
c66ac9db
NB		 1949/*
1950 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
1951 */
1952static int transport_get_sense_data(struct se_cmd *cmd)
1953{
1954 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 1955 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1956 unsigned long flags;
1957 u32 offset = 0;
1958
e3d6f909
AG		 1959 WARN_ON(!cmd->se_lun);
1960
42bf829e
CH		 1961 if (!dev)
1962 return 0;
1963
a1d8b49a 1964 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1965 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 1966 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1967 return 0;
1968 }
1969
cf572a96
CH		 1970 if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
1971 goto out;
c66ac9db 1972
cf572a96
CH		 1973 if (!dev->transport->get_sense_buffer) {
1974 pr_err("dev->transport->get_sense_buffer is NULL\n");
1975 goto out;
1976 }
c66ac9db 1977
5787cacd 1978 sense_buffer = dev->transport->get_sense_buffer(cmd);
cf572a96 1979 if (!sense_buffer) {
5787cacd 1980 pr_err("ITT 0x%08x cmd %p: Unable to locate"
cf572a96 1981 " sense buffer for task with sense\n",
5787cacd 1982 cmd->se_tfo->get_task_tag(cmd), cmd);
cf572a96 1983 goto out;
c66ac9db 1984 }
5787cacd 1985
cf572a96
CH		 1986 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1987
1988 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
1989
1990 memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
cf572a96
CH		 1991
1992 /* Automatically padded */
1993 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
1994
1995 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
1996 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
1997 return 0;
1998
785fdf70 1999out:
a1d8b49a 2000 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2001 return -1;
2002}
2003
5f41a31d
CH		 2004/*
2005 * Process all commands up to the last received ORDERED task attribute which
2006 * requires another blocking boundary
2007 */
2008static void target_restart_delayed_cmds(struct se_device *dev)
2009{
2010 for (;;) {
2011 struct se_cmd *cmd;
2012
2013 spin_lock(&dev->delayed_cmd_lock);
2014 if (list_empty(&dev->delayed_cmd_list)) {
2015 spin_unlock(&dev->delayed_cmd_lock);
2016 break;
2017 }
2018
2019 cmd = list_entry(dev->delayed_cmd_list.next,
2020 struct se_cmd, se_delayed_node);
2021 list_del(&cmd->se_delayed_node);
2022 spin_unlock(&dev->delayed_cmd_lock);
2023
2024 __target_execute_cmd(cmd);
2025
2026 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
2027 break;
2028 }
2029}
2030
c66ac9db 2031/*
35e0e757 2032 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 2033 * and ordered cmds need to have their tasks added to the execution queue.
2034 */
2035static void transport_complete_task_attr(struct se_cmd *cmd)
2036{
5951146d 2037 struct se_device *dev = cmd->se_dev;
c66ac9db 2038
e66ecd50 2039 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 2040 atomic_dec(&dev->simple_cmds);
2041 smp_mb__after_atomic_dec();
2042 dev->dev_cur_ordered_id++;
6708bb27 2043 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 2044 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
2045 cmd->se_ordered_id);
e66ecd50 2046 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 2047 dev->dev_cur_ordered_id++;
6708bb27 2048 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 2049 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
2050 cmd->se_ordered_id);
e66ecd50 2051 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 2052 atomic_dec(&dev->dev_ordered_sync);
2053 smp_mb__after_atomic_dec();
c66ac9db
NB		 2054
2055 dev->dev_cur_ordered_id++;
6708bb27 2056 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 2057 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
2058 }
c66ac9db 2059
5f41a31d 2060 target_restart_delayed_cmds(dev);
c66ac9db
NB		 2061}
2062
e057f533 2063static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 2064{
2065 int ret = 0;
2066
e057f533
CH		 2067 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2068 transport_complete_task_attr(cmd);
2069
2070 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2071 ret = cmd->se_tfo->queue_status(cmd);
2072 if (ret)
2073 goto out;
2074 }
07bde79a
NB		 2075
2076 switch (cmd->data_direction) {
2077 case DMA_FROM_DEVICE:
2078 ret = cmd->se_tfo->queue_data_in(cmd);
2079 break;
2080 case DMA_TO_DEVICE:
ec98f782 2081 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 2082 ret = cmd->se_tfo->queue_data_in(cmd);
2083 if (ret < 0)
e057f533 2084 break;
07bde79a
NB		 2085 }
2086 /* Fall through for DMA_TO_DEVICE */
2087 case DMA_NONE:
2088 ret = cmd->se_tfo->queue_status(cmd);
2089 break;
2090 default:
2091 break;
2092 }
2093
e057f533
CH		 2094out:
2095 if (ret < 0) {
2096 transport_handle_queue_full(cmd, cmd->se_dev);
2097 return;
2098 }
2099 transport_lun_remove_cmd(cmd);
2100 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2101}
2102
2103static void transport_handle_queue_full(
2104 struct se_cmd *cmd,
e057f533 2105 struct se_device *dev)
07bde79a
NB		 2106{
2107 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 2108 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2109 atomic_inc(&dev->dev_qf_count);
2110 smp_mb__after_atomic_inc();
2111 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2112
2113 schedule_work(&cmd->se_dev->qf_work_queue);
2114}
2115
35e0e757 2116static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2117{
35e0e757 2118 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 2119 int reason = 0, ret;
35e0e757 2120
c66ac9db
NB		 2121 /*
2122 * Check if we need to move delayed/dormant tasks from cmds on the
2123 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2124 * Attribute.
2125 */
5951146d 2126 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 2127 transport_complete_task_attr(cmd);
07bde79a
NB		 2128 /*
2129 * Check to schedule QUEUE_FULL work, or execute an existing
2130 * cmd->transport_qf_callback()
2131 */
2132 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2133 schedule_work(&cmd->se_dev->qf_work_queue);
2134
c66ac9db
NB		 2135 /*
2136 * Check if we need to retrieve a sense buffer from
2137 * the struct se_cmd in question.
2138 */
2139 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2140 if (transport_get_sense_data(cmd) < 0)
2141 reason = TCM_NON_EXISTENT_LUN;
2142
c66ac9db 2143 if (cmd->scsi_status) {
07bde79a 2144 ret = transport_send_check_condition_and_sense(
c66ac9db 2145 cmd, reason, 1);
f147abb4 2146 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 2147 goto queue_full;
2148
c66ac9db
NB		 2149 transport_lun_remove_cmd(cmd);
2150 transport_cmd_check_stop_to_fabric(cmd);
2151 return;
2152 }
2153 }
2154 /*
25985edc 2155 * Check for a callback, used by amongst other things
c66ac9db
NB		 2156 * XDWRITE_READ_10 emulation.
2157 */
2158 if (cmd->transport_complete_callback)
2159 cmd->transport_complete_callback(cmd);
2160
2161 switch (cmd->data_direction) {
2162 case DMA_FROM_DEVICE:
2163 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2164 if (cmd->se_lun->lun_sep) {
2165 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2166 cmd->data_length;
2167 }
2168 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 2169
07bde79a 2170 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2171 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2172 goto queue_full;
c66ac9db
NB		 2173 break;
2174 case DMA_TO_DEVICE:
2175 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2176 if (cmd->se_lun->lun_sep) {
2177 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2178 cmd->data_length;
2179 }
2180 spin_unlock(&cmd->se_lun->lun_sep_lock);
2181 /*
2182 * Check if we need to send READ payload for BIDI-COMMAND
2183 */
ec98f782 2184 if (cmd->t_bidi_data_sg) {
c66ac9db 2185 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2186 if (cmd->se_lun->lun_sep) {
2187 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2188 cmd->data_length;
2189 }
2190 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2191 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2192 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2193 goto queue_full;
c66ac9db
NB		 2194 break;
2195 }
2196 /* Fall through for DMA_TO_DEVICE */
2197 case DMA_NONE:
07bde79a 2198 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2199 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2200 goto queue_full;
c66ac9db
NB		 2201 break;
2202 default:
2203 break;
2204 }
2205
2206 transport_lun_remove_cmd(cmd);
2207 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2208 return;
2209
2210queue_full:
6708bb27 2211 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2212 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2213 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2214 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2215}
2216
6708bb27 2217static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2218{
ec98f782 2219 struct scatterlist *sg;
ec98f782 2220 int count;
c66ac9db 2221
6708bb27
AG		 2222 for_each_sg(sgl, sg, nents, count)
2223 __free_page(sg_page(sg));
c66ac9db 2224
6708bb27
AG		 2225 kfree(sgl);
2226}
c66ac9db 2227
6708bb27
AG		 2228static inline void transport_free_pages(struct se_cmd *cmd)
2229{
2230 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2231 return;
2232
2233 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2234 cmd->t_data_sg = NULL;
2235 cmd->t_data_nents = 0;
c66ac9db 2236
6708bb27 2237 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2238 cmd->t_bidi_data_sg = NULL;
2239 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2240}
2241
e26d99ae
CH		 2242/**
2243 * transport_release_cmd - free a command
2244 * @cmd: command to free
2245 *
2246 * This routine unconditionally frees a command, and reference counting
2247 * or list removal must be done in the caller.
2248 */
2249static void transport_release_cmd(struct se_cmd *cmd)
2250{
2251 BUG_ON(!cmd->se_tfo);
2252
c8e31f26 2253 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2254 core_tmr_release_req(cmd->se_tmr_req);
2255 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2256 kfree(cmd->t_task_cdb);
2257 /*
7481deb4
NB		 2258 * If this cmd has been setup with target_get_sess_cmd(), drop
2259 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2260 */
7481deb4
NB		 2261 if (cmd->check_release != 0) {
2262 target_put_sess_cmd(cmd->se_sess, cmd);
2263 return;
2264 }
e26d99ae
CH		 2265 cmd->se_tfo->release_cmd(cmd);
2266}
2267
d3df7825
CH		 2268/**
2269 * transport_put_cmd - release a reference to a command
2270 * @cmd: command to release
2271 *
2272 * This routine releases our reference to the command and frees it if possible.
2273 */
39c05f32 2274static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 2275{
2276 unsigned long flags;
c66ac9db 2277
a1d8b49a 2278 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 2279 if (atomic_read(&cmd->t_fe_count)) {
2280 if (!atomic_dec_and_test(&cmd->t_fe_count))
2281 goto out_busy;
2282 }
2283
7d680f3b
CH		 2284 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2285 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2286 target_remove_from_state_list(cmd);
c66ac9db 2287 }
a1d8b49a 2288 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2289
c66ac9db 2290 transport_free_pages(cmd);
31afc39c 2291 transport_release_cmd(cmd);
39c05f32 2292 return;
4911e3cc
CH		 2293out_busy:
2294 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2295}
2296
c66ac9db 2297/*
ec98f782
AG		 2298 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2299 * allocating in the core.
c66ac9db
NB		 2300 * @cmd: Associated se_cmd descriptor
2301 * @mem: SGL style memory for TCM WRITE / READ
2302 * @sg_mem_num: Number of SGL elements
2303 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2304 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2305 *
2306 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2307 * of parameters.
2308 */
2309int transport_generic_map_mem_to_cmd(
2310 struct se_cmd *cmd,
5951146d
AG		 2311 struct scatterlist *sgl,
2312 u32 sgl_count,
2313 struct scatterlist *sgl_bidi,
2314 u32 sgl_bidi_count)
c66ac9db 2315{
5951146d 2316 if (!sgl || !sgl_count)
c66ac9db 2317 return 0;
c66ac9db 2318
64f1db38
CH		 2319 /*
2320 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2321 * scatterlists already have been set to follow what the fabric
2322 * passes for the original expected data transfer length.
2323 */
2324 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2325 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2326 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2327 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2328 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2329 return -EINVAL;
2330 }
c66ac9db 2331
64f1db38
CH		 2332 cmd->t_data_sg = sgl;
2333 cmd->t_data_nents = sgl_count;
c66ac9db 2334
64f1db38
CH		 2335 if (sgl_bidi && sgl_bidi_count) {
2336 cmd->t_bidi_data_sg = sgl_bidi;
2337 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db 2338 }
64f1db38 2339 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 2340 return 0;
2341}
2342EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2343
4949314c 2344void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2345{
ec98f782 2346 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2347 struct page **pages;
2348 int i;
05d1c7c0 2349
ec98f782 2350 BUG_ON(!sg);
05d1c7c0 2351 /*
ec98f782
AG		 2352 * We need to take into account a possible offset here for fabrics like
2353 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2354 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2355 */
4949314c
AG		 2356 if (!cmd->t_data_nents)
2357 return NULL;
2358 else if (cmd->t_data_nents == 1)
2359 return kmap(sg_page(sg)) + sg->offset;
2360
2361 /* >1 page. use vmap */
2362 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2363 if (!pages)
2364 return NULL;
2365
2366 /* convert sg[] to pages[] */
2367 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2368 pages[i] = sg_page(sg);
2369 }
2370
2371 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2372 kfree(pages);
2373 if (!cmd->t_data_vmap)
2374 return NULL;
2375
2376 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2377}
4949314c 2378EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2379
4949314c 2380void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2381{
a1edf9cf 2382 if (!cmd->t_data_nents) {
4949314c 2383 return;
a1edf9cf 2384 } else if (cmd->t_data_nents == 1) {
4949314c 2385 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2386 return;
2387 }
4949314c
AG		 2388
2389 vunmap(cmd->t_data_vmap);
2390 cmd->t_data_vmap = NULL;
05d1c7c0 2391}
4949314c 2392EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2393
c66ac9db 2394static int
05d1c7c0 2395transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2396{
ec98f782
AG		 2397 u32 length = cmd->data_length;
2398 unsigned int nents;
2399 struct page *page;
9db9da33 2400 gfp_t zero_flag;
ec98f782 2401 int i = 0;
c66ac9db 2402
ec98f782
AG		 2403 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2404 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2405 if (!cmd->t_data_sg)
2406 return -ENOMEM;
c66ac9db 2407
ec98f782
AG		 2408 cmd->t_data_nents = nents;
2409 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2410
64f1db38 2411 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2412
ec98f782
AG		 2413 while (length) {
2414 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2415 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2416 if (!page)
2417 goto out;
c66ac9db 2418
ec98f782
AG		 2419 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2420 length -= page_len;
2421 i++;
c66ac9db 2422 }
c66ac9db 2423 return 0;
c66ac9db 2424
ec98f782
AG		 2425out:
2426 while (i >= 0) {
2427 __free_page(sg_page(&cmd->t_data_sg[i]));
2428 i--;
c66ac9db 2429 }
ec98f782
AG		 2430 kfree(cmd->t_data_sg);
2431 cmd->t_data_sg = NULL;
2432 return -ENOMEM;
c66ac9db
NB		 2433}
2434
da0f7619 2435/*
b16a35b0
AG		 2436 * Allocate any required resources to execute the command. For writes we
2437 * might not have the payload yet, so notify the fabric via a call to
2438 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2439 */
a1d8b49a 2440int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2441{
c66ac9db
NB		 2442 int ret = 0;
2443
2444 /*
2445 * Determine is the TCM fabric module has already allocated physical
2446 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2447 * beforehand.
c66ac9db 2448 */
ec98f782
AG		 2449 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2450 cmd->data_length) {
05d1c7c0 2451 ret = transport_generic_get_mem(cmd);
c66ac9db 2452 if (ret < 0)
03e98c9e 2453 goto out_fail;
c66ac9db 2454 }
da0f7619 2455
4101f0a8 2456 /* Workaround for handling zero-length control CDBs */
64f1db38 2457 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) {
7d680f3b 2458 spin_lock_irq(&cmd->t_state_lock);
410f6702 2459 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 2460 cmd->transport_state |= CMD_T_ACTIVE;
2461 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 2462
2463 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2464 u8 ua_asc = 0, ua_ascq = 0;
2465
2466 core_scsi3_ua_clear_for_request_sense(cmd,
2467 &ua_asc, &ua_ascq);
2468 }
2469
410f6702
RD		 2470 INIT_WORK(&cmd->work, target_complete_ok_work);
2471 queue_work(target_completion_wq, &cmd->work);
2472 return 0;
2473 }
da0f7619 2474
4101f0a8 2475 atomic_inc(&cmd->t_fe_count);
4101f0a8 2476
c66ac9db 2477 /*
5787cacd
CH		 2478 * For WRITEs, let the fabric know its buffer is ready.
2479 *
2480 * The command will be added to the execution queue after its write
2481 * data has arrived.
5f41a31d 2482 *
5787cacd 2483 * Everything else but a WRITE, add the command to the execution queue.
c66ac9db 2484 */
5f41a31d
CH		 2485 target_add_to_state_list(cmd);
2486 if (cmd->data_direction == DMA_TO_DEVICE)
2487 return transport_generic_write_pending(cmd);
2488 target_execute_cmd(cmd);
c66ac9db 2489 return 0;
da0f7619
CH		 2490
2491out_fail:
2492 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2493 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2494 return -EINVAL;
c66ac9db 2495}
a1d8b49a 2496EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 2497
2498/* transport_generic_process_write():
2499 *
2500 *
2501 */
2502void transport_generic_process_write(struct se_cmd *cmd)
2503{
5f41a31d 2504 target_execute_cmd(cmd);
c66ac9db
NB		 2505}
2506EXPORT_SYMBOL(transport_generic_process_write);
2507
e057f533 2508static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2509{
f147abb4
NB		 2510 int ret;
2511
2512 ret = cmd->se_tfo->write_pending(cmd);
2513 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2514 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2515 cmd);
2516 transport_handle_queue_full(cmd, cmd->se_dev);
2517 }
07bde79a
NB		 2518}
2519
c66ac9db
NB		 2520static int transport_generic_write_pending(struct se_cmd *cmd)
2521{
2522 unsigned long flags;
2523 int ret;
2524
a1d8b49a 2525 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2526 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 2527 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 2528
c66ac9db
NB		 2529 /*
2530 * Clear the se_cmd for WRITE_PENDING status in order to set
7d680f3b
CH		 2531 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
2532 * from HW target mode interrupt code. This is safe to be called
2533 * with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 2534 * because the se_cmd->se_lun pointer is not being cleared.
2535 */
2536 transport_cmd_check_stop(cmd, 1, 0);
2537
2538 /*
2539 * Call the fabric write_pending function here to let the
2540 * frontend know that WRITE buffers are ready.
2541 */
e3d6f909 2542 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 2543 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 2544 goto queue_full;
2545 else if (ret < 0)
c66ac9db
NB		 2546 return ret;
2547
03e98c9e 2548 return 1;
07bde79a
NB		 2549
2550queue_full:
6708bb27 2551 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 2552 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 2553 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 2554 return 0;
c66ac9db
NB		 2555}
2556
39c05f32 2557void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2558{
d14921d6 2559 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2560 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2561 transport_wait_for_tasks(cmd);
2562
35462975 2563 transport_release_cmd(cmd);
d14921d6
NB		 2564 } else {
2565 if (wait_for_tasks)
2566 transport_wait_for_tasks(cmd);
2567
c66ac9db
NB		 2568 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2569
82f1c8a4 2570 if (cmd->se_lun)
c66ac9db 2571 transport_lun_remove_cmd(cmd);
c66ac9db 2572
39c05f32 2573 transport_put_cmd(cmd);
c66ac9db
NB		 2574 }
2575}
2576EXPORT_SYMBOL(transport_generic_free_cmd);
2577
a17f091d
NB		 2578/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2579 * @se_sess: session to reference
2580 * @se_cmd: command descriptor to add
a6360785 2581 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2582 */
a6360785
NB		 2583void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2584 bool ack_kref)
a17f091d
NB		 2585{
2586 unsigned long flags;
2587
7481deb4 2588 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2589 /*
2590 * Add a second kref if the fabric caller is expecting to handle
2591 * fabric acknowledgement that requires two target_put_sess_cmd()
2592 * invocations before se_cmd descriptor release.
2593 */
86715569 2594 if (ack_kref == true) {
a6360785 2595 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2596 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2597 }
7481deb4 2598
a17f091d
NB		 2599 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2600 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2601 se_cmd->check_release = 1;
2602 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2603}
2604EXPORT_SYMBOL(target_get_sess_cmd);
2605
7481deb4 2606static void target_release_cmd_kref(struct kref *kref)
a17f091d 2607{
7481deb4
NB		 2608 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2609 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 2610 unsigned long flags;
2611
2612 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2613 if (list_empty(&se_cmd->se_cmd_list)) {
2614 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2615 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2616 return;
a17f091d 2617 }
a17f091d
NB		 2618 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2619 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2620 complete(&se_cmd->cmd_wait_comp);
7481deb4 2621 return;
a17f091d
NB		 2622 }
2623 list_del(&se_cmd->se_cmd_list);
2624 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2625
7481deb4
NB		 2626 se_cmd->se_tfo->release_cmd(se_cmd);
2627}
2628
2629/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2630 * @se_sess: session to reference
2631 * @se_cmd: command descriptor to drop
2632 */
2633int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2634{
2635 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2636}
2637EXPORT_SYMBOL(target_put_sess_cmd);
2638
2639/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
2640 * @se_sess: session to split
2641 */
2642void target_splice_sess_cmd_list(struct se_session *se_sess)
2643{
2644 struct se_cmd *se_cmd;
2645 unsigned long flags;
2646
2647 WARN_ON(!list_empty(&se_sess->sess_wait_list));
2648 INIT_LIST_HEAD(&se_sess->sess_wait_list);
2649
2650 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2651 se_sess->sess_tearing_down = 1;
2652
2653 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2654
2655 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2656 se_cmd->cmd_wait_set = 1;
2657
2658 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2659}
2660EXPORT_SYMBOL(target_splice_sess_cmd_list);
2661
2662/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2663 * @se_sess: session to wait for active I/O
2664 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2665 */
2666void target_wait_for_sess_cmds(
2667 struct se_session *se_sess,
2668 int wait_for_tasks)
2669{
2670 struct se_cmd *se_cmd, *tmp_cmd;
2671 bool rc = false;
2672
2673 list_for_each_entry_safe(se_cmd, tmp_cmd,
2674 &se_sess->sess_wait_list, se_cmd_list) {
2675 list_del(&se_cmd->se_cmd_list);
2676
2677 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2678 " %d\n", se_cmd, se_cmd->t_state,
2679 se_cmd->se_tfo->get_cmd_state(se_cmd));
2680
2681 if (wait_for_tasks) {
2682 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2683 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2684 se_cmd->se_tfo->get_cmd_state(se_cmd));
2685
2686 rc = transport_wait_for_tasks(se_cmd);
2687
2688 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2689 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2690 se_cmd->se_tfo->get_cmd_state(se_cmd));
2691 }
2692
2693 if (!rc) {
2694 wait_for_completion(&se_cmd->cmd_wait_comp);
2695 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2696 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2697 se_cmd->se_tfo->get_cmd_state(se_cmd));
2698 }
2699
2700 se_cmd->se_tfo->release_cmd(se_cmd);
2701 }
2702}
2703EXPORT_SYMBOL(target_wait_for_sess_cmds);
2704
c66ac9db
NB		 2705/* transport_lun_wait_for_tasks():
2706 *
2707 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2708 * an struct se_lun to be successfully shutdown.
2709 */
2710static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2711{
2712 unsigned long flags;
cf572a96
CH		 2713 int ret = 0;
2714
c66ac9db
NB		 2715 /*
2716 * If the frontend has already requested this struct se_cmd to
2717 * be stopped, we can safely ignore this struct se_cmd.
2718 */
a1d8b49a 2719 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2720 if (cmd->transport_state & CMD_T_STOP) {
2721 cmd->transport_state &= ~CMD_T_LUN_STOP;
2722
2723 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2724 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2725 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2726 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 2727 return -EPERM;
c66ac9db 2728 }
7d680f3b 2729 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2730 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2731
5951146d 2732 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 2733
cf572a96
CH		 2734 // XXX: audit task_flags checks.
2735 spin_lock_irqsave(&cmd->t_state_lock, flags);
2736 if ((cmd->transport_state & CMD_T_BUSY) &&
2737 (cmd->transport_state & CMD_T_SENT)) {
2738 if (!target_stop_cmd(cmd, &flags))
2739 ret++;
cf572a96 2740 }
5f41a31d 2741 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2742
785fdf70
CH		 2743 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2744 " %d\n", cmd, ret);
c66ac9db 2745 if (!ret) {
6708bb27 2746 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2747 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2748 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2749 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2750 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2751 }
3df8d40b 2752 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 2753
2754 return 0;
2755}
2756
c66ac9db
NB		 2757static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2758{
2759 struct se_cmd *cmd = NULL;
2760 unsigned long lun_flags, cmd_flags;
2761 /*
2762 * Do exception processing and return CHECK_CONDITION status to the
2763 * Initiator Port.
2764 */
2765 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2766 while (!list_empty(&lun->lun_cmd_list)) {
2767 cmd = list_first_entry(&lun->lun_cmd_list,
2768 struct se_cmd, se_lun_node);
3d26fea0 2769 list_del_init(&cmd->se_lun_node);
5951146d 2770
c66ac9db
NB		 2771 /*
2772 * This will notify iscsi_target_transport.c:
2773 * transport_cmd_check_stop() that a LUN shutdown is in
2774 * progress for the iscsi_cmd_t.
2775 */
a1d8b49a 2776 spin_lock(&cmd->t_state_lock);
6708bb27 2777 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2778 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2779 cmd->se_lun->unpacked_lun,
2780 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2781 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2782 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2783
2784 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2785
6708bb27
AG		 2786 if (!cmd->se_lun) {
2787 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2788 cmd->se_tfo->get_task_tag(cmd),
2789 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2790 BUG();
2791 }
2792 /*
2793 * If the Storage engine still owns the iscsi_cmd_t, determine
2794 * and/or stop its context.
2795 */
6708bb27 2796 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2797 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2798 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2799
e3d6f909 2800 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2801 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2802 continue;
2803 }
2804
6708bb27 2805 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2806 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2807 cmd->se_lun->unpacked_lun,
2808 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2809
a1d8b49a 2810 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2811 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2812 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2813 goto check_cond;
2814 }
7d680f3b 2815 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2816 target_remove_from_state_list(cmd);
a1d8b49a 2817 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2818
c66ac9db
NB		 2819 /*
2820 * The Storage engine stopped this struct se_cmd before it was
2821 * send to the fabric frontend for delivery back to the
2822 * Initiator Node. Return this SCSI CDB back with an
2823 * CHECK_CONDITION status.
2824 */
2825check_cond:
2826 transport_send_check_condition_and_sense(cmd,
2827 TCM_NON_EXISTENT_LUN, 0);
2828 /*
2829 * If the fabric frontend is waiting for this iscsi_cmd_t to
2830 * be released, notify the waiting thread now that LU has
2831 * finished accessing it.
2832 */
a1d8b49a 2833 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2834 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2835 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2836 " struct se_cmd: %p ITT: 0x%08x\n",
2837 lun->unpacked_lun,
e3d6f909 2838 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2839
a1d8b49a 2840 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 2841 cmd_flags);
2842 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 2843 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2844 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2845 continue;
2846 }
6708bb27 2847 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2848 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2849
a1d8b49a 2850 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2851 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2852 }
2853 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2854}
2855
2856static int transport_clear_lun_thread(void *p)
2857{
8359cf43 2858 struct se_lun *lun = p;
c66ac9db
NB		 2859
2860 __transport_clear_lun_from_sessions(lun);
2861 complete(&lun->lun_shutdown_comp);
2862
2863 return 0;
2864}
2865
2866int transport_clear_lun_from_sessions(struct se_lun *lun)
2867{
2868 struct task_struct *kt;
2869
5951146d 2870 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2871 "tcm_cl_%u", lun->unpacked_lun);
2872 if (IS_ERR(kt)) {
6708bb27 2873 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2874 return PTR_ERR(kt);
c66ac9db
NB		 2875 }
2876 wait_for_completion(&lun->lun_shutdown_comp);
2877
2878 return 0;
2879}
2880
d14921d6
NB		 2881/**
2882 * transport_wait_for_tasks - wait for completion to occur
2883 * @cmd: command to wait
c66ac9db 2884 *
d14921d6
NB		 2885 * Called from frontend fabric context to wait for storage engine
2886 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2887 */
a17f091d 2888bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2889{
2890 unsigned long flags;
2891
a1d8b49a 2892 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2893 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2894 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2895 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2896 return false;
d14921d6 2897 }
cb4f4d3c 2898
c8e31f26
AG		 2899 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2900 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2901 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2902 return false;
d14921d6 2903 }
c66ac9db
NB		 2904 /*
2905 * If we are already stopped due to an external event (ie: LUN shutdown)
2906 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2907 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2908 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2909 * has completed its operation on the struct se_cmd.
2910 */
7d680f3b 2911 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2912 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2913 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2914 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2915 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2916 /*
2917 * There is a special case for WRITES where a FE exception +
2918 * LUN shutdown means ConfigFS context is still sleeping on
2919 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2920 * We go ahead and up transport_lun_stop_comp just to be sure
2921 * here.
2922 */
a1d8b49a
AG		 2923 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2924 complete(&cmd->transport_lun_stop_comp);
2925 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2926 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2927
cf572a96 2928 target_remove_from_state_list(cmd);
c66ac9db
NB		 2929 /*
2930 * At this point, the frontend who was the originator of this
2931 * struct se_cmd, now owns the structure and can be released through
2932 * normal means below.
2933 */
6708bb27 2934 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2935 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2936 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2937 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2938
7d680f3b 2939 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2940 }
7d680f3b 2941
3d28934a 2942 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2943 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2944 return false;
d14921d6 2945 }
c66ac9db 2946
7d680f3b 2947 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2948
6708bb27 2949 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2950 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2951 cmd, cmd->se_tfo->get_task_tag(cmd),
2952 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2953
a1d8b49a 2954 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2955
5951146d 2956 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 2957
a1d8b49a 2958 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2959
a1d8b49a 2960 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2961 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2962
6708bb27 2963 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 2964 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2965 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2966
d14921d6 2967 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2968
2969 return true;
c66ac9db 2970}
d14921d6 2971EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2972
2973static int transport_get_sense_codes(
2974 struct se_cmd *cmd,
2975 u8 *asc,
2976 u8 *ascq)
2977{
2978 *asc = cmd->scsi_asc;
2979 *ascq = cmd->scsi_ascq;
2980
2981 return 0;
2982}
2983
2984static int transport_set_sense_codes(
2985 struct se_cmd *cmd,
2986 u8 asc,
2987 u8 ascq)
2988{
2989 cmd->scsi_asc = asc;
2990 cmd->scsi_ascq = ascq;
2991
2992 return 0;
2993}
2994
2995int transport_send_check_condition_and_sense(
2996 struct se_cmd *cmd,
2997 u8 reason,
2998 int from_transport)
2999{
3000 unsigned char *buffer = cmd->sense_buffer;
3001 unsigned long flags;
3002 int offset;
3003 u8 asc = 0, ascq = 0;
3004
a1d8b49a 3005 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3006 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 3007 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3008 return 0;
3009 }
3010 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 3011 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3012
3013 if (!reason && from_transport)
3014 goto after_reason;
3015
3016 if (!from_transport)
3017 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
3018 /*
3019 * Data Segment and SenseLength of the fabric response PDU.
3020 *
3021 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
3022 * from include/scsi/scsi_cmnd.h
3023 */
e3d6f909 3024 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 3025 TRANSPORT_SENSE_BUFFER);
3026 /*
3027 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
3028 * SENSE KEY values from include/scsi/scsi.h
3029 */
3030 switch (reason) {
3031 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 3032 /* CURRENT ERROR */
3033 buffer[offset] = 0x70;
895f3022 3034 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 3035 /* ILLEGAL REQUEST */
3036 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3037 /* LOGICAL UNIT NOT SUPPORTED */
3038 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
3039 break;
c66ac9db
NB		 3040 case TCM_UNSUPPORTED_SCSI_OPCODE:
3041 case TCM_SECTOR_COUNT_TOO_MANY:
3042 /* CURRENT ERROR */
3043 buffer[offset] = 0x70;
895f3022 3044 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3045 /* ILLEGAL REQUEST */
3046 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3047 /* INVALID COMMAND OPERATION CODE */
3048 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
3049 break;
3050 case TCM_UNKNOWN_MODE_PAGE:
3051 /* CURRENT ERROR */
3052 buffer[offset] = 0x70;
895f3022 3053 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3054 /* ILLEGAL REQUEST */
3055 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3056 /* INVALID FIELD IN CDB */
3057 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
3058 break;
3059 case TCM_CHECK_CONDITION_ABORT_CMD:
3060 /* CURRENT ERROR */
3061 buffer[offset] = 0x70;
895f3022 3062 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3063 /* ABORTED COMMAND */
3064 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3065 /* BUS DEVICE RESET FUNCTION OCCURRED */
3066 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
3067 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
3068 break;
3069 case TCM_INCORRECT_AMOUNT_OF_DATA:
3070 /* CURRENT ERROR */
3071 buffer[offset] = 0x70;
895f3022 3072 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3073 /* ABORTED COMMAND */
3074 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3075 /* WRITE ERROR */
3076 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
3077 /* NOT ENOUGH UNSOLICITED DATA */
3078 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
3079 break;
3080 case TCM_INVALID_CDB_FIELD:
3081 /* CURRENT ERROR */
3082 buffer[offset] = 0x70;
895f3022 3083 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 3084 /* ILLEGAL REQUEST */
3085 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 3086 /* INVALID FIELD IN CDB */
3087 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
3088 break;
3089 case TCM_INVALID_PARAMETER_LIST:
3090 /* CURRENT ERROR */
3091 buffer[offset] = 0x70;
895f3022 3092 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 3093 /* ILLEGAL REQUEST */
3094 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 3095 /* INVALID FIELD IN PARAMETER LIST */
3096 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
3097 break;
3098 case TCM_UNEXPECTED_UNSOLICITED_DATA:
3099 /* CURRENT ERROR */
3100 buffer[offset] = 0x70;
895f3022 3101 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3102 /* ABORTED COMMAND */
3103 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3104 /* WRITE ERROR */
3105 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
3106 /* UNEXPECTED_UNSOLICITED_DATA */
3107 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
3108 break;
3109 case TCM_SERVICE_CRC_ERROR:
3110 /* CURRENT ERROR */
3111 buffer[offset] = 0x70;
895f3022 3112 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3113 /* ABORTED COMMAND */
3114 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3115 /* PROTOCOL SERVICE CRC ERROR */
3116 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
3117 /* N/A */
3118 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
3119 break;
3120 case TCM_SNACK_REJECTED:
3121 /* CURRENT ERROR */
3122 buffer[offset] = 0x70;
895f3022 3123 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3124 /* ABORTED COMMAND */
3125 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3126 /* READ ERROR */
3127 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
3128 /* FAILED RETRANSMISSION REQUEST */
3129 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
3130 break;
3131 case TCM_WRITE_PROTECTED:
3132 /* CURRENT ERROR */
3133 buffer[offset] = 0x70;
895f3022 3134 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3135 /* DATA PROTECT */
3136 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
3137 /* WRITE PROTECTED */
3138 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
3139 break;
3140 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
3141 /* CURRENT ERROR */
3142 buffer[offset] = 0x70;
895f3022 3143 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3144 /* UNIT ATTENTION */
3145 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
3146 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3147 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3148 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3149 break;
3150 case TCM_CHECK_CONDITION_NOT_READY:
3151 /* CURRENT ERROR */
3152 buffer[offset] = 0x70;
895f3022 3153 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3154 /* Not Ready */
3155 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
3156 transport_get_sense_codes(cmd, &asc, &ascq);
3157 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3158 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3159 break;
3160 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3161 default:
3162 /* CURRENT ERROR */
3163 buffer[offset] = 0x70;
895f3022 3164 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3165 /* ILLEGAL REQUEST */
3166 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3167 /* LOGICAL UNIT COMMUNICATION FAILURE */
3168 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
3169 break;
3170 }
3171 /*
3172 * This code uses linux/include/scsi/scsi.h SAM status codes!
3173 */
3174 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3175 /*
3176 * Automatically padded, this value is encoded in the fabric's
3177 * data_length response PDU containing the SCSI defined sense data.
3178 */
3179 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
3180
3181after_reason:
07bde79a 3182 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3183}
3184EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3185
3186int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3187{
3188 int ret = 0;
3189
7d680f3b 3190 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 3191 if (!send_status ||
c66ac9db
NB		 3192 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3193 return 1;
8b1e1244 3194
6708bb27 3195 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 3196 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 3197 cmd->t_task_cdb[0],
e3d6f909 3198 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3199
c66ac9db 3200 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 3201 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3202 ret = 1;
3203 }
3204 return ret;
3205}
3206EXPORT_SYMBOL(transport_check_aborted_status);
3207
3208void transport_send_task_abort(struct se_cmd *cmd)
3209{
c252f003
NB		 3210 unsigned long flags;
3211
3212 spin_lock_irqsave(&cmd->t_state_lock, flags);
3213 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3214 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3215 return;
3216 }
3217 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3218
c66ac9db
NB		 3219 /*
3220 * If there are still expected incoming fabric WRITEs, we wait
3221 * until until they have completed before sending a TASK_ABORTED
3222 * response. This response with TASK_ABORTED status will be
3223 * queued back to fabric module by transport_check_aborted_status().
3224 */
3225 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3226 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 3227 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 3228 smp_mb__after_atomic_inc();
c66ac9db
NB		 3229 }
3230 }
3231 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3232
6708bb27 3233 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 3234 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 3235 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3236
e3d6f909 3237 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3238}
3239
e26d99ae 3240static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 3241{
5951146d 3242 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3243 struct se_tmr_req *tmr = cmd->se_tmr_req;
3244 int ret;
3245
3246 switch (tmr->function) {
5c6cd613 3247 case TMR_ABORT_TASK:
3d28934a 3248 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3249 break;
5c6cd613
NB		 3250 case TMR_ABORT_TASK_SET:
3251 case TMR_CLEAR_ACA:
3252 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3253 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3254 break;
5c6cd613 3255 case TMR_LUN_RESET:
c66ac9db
NB		 3256 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3257 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3258 TMR_FUNCTION_REJECTED;
3259 break;
5c6cd613 3260 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3261 tmr->response = TMR_FUNCTION_REJECTED;
3262 break;
5c6cd613 3263 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3264 tmr->response = TMR_FUNCTION_REJECTED;
3265 break;
c66ac9db 3266 default:
6708bb27 3267 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3268 tmr->function);
3269 tmr->response = TMR_FUNCTION_REJECTED;
3270 break;
3271 }
3272
3273 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 3274 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3275
b7b8bef7 3276 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3277 return 0;
3278}
3279
c66ac9db
NB		 3280/* transport_processing_thread():
3281 *
3282 *
3283 */
3284static int transport_processing_thread(void *param)
3285{
5951146d 3286 int ret;
c66ac9db 3287 struct se_cmd *cmd;
8359cf43 3288 struct se_device *dev = param;
c66ac9db 3289
c66ac9db 3290 while (!kthread_should_stop()) {
e3d6f909
AG		 3291 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
3292 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 3293 kthread_should_stop());
3294 if (ret < 0)
3295 goto out;
3296
c66ac9db 3297get_cmd:
5951146d
AG		 3298 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
3299 if (!cmd)
c66ac9db
NB		 3300 continue;
3301
5951146d 3302 switch (cmd->t_state) {
680b73c5
CH		 3303 case TRANSPORT_NEW_CMD:
3304 BUG();
3305 break;
c66ac9db 3306 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 3307 if (!cmd->se_tfo->new_cmd_map) {
3308 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 3309 " NULL for TRANSPORT_NEW_CMD_MAP\n");
3310 BUG();
3311 }
e3d6f909 3312 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 3313 if (ret < 0) {
03e98c9e 3314 transport_generic_request_failure(cmd);
c66ac9db
NB		 3315 break;
3316 }
c66ac9db 3317 ret = transport_generic_new_cmd(cmd);
f147abb4 3318 if (ret < 0) {
03e98c9e
NB		 3319 transport_generic_request_failure(cmd);
3320 break;
c66ac9db
NB		 3321 }
3322 break;
3323 case TRANSPORT_PROCESS_WRITE:
3324 transport_generic_process_write(cmd);
3325 break;
c66ac9db
NB		 3326 case TRANSPORT_PROCESS_TMR:
3327 transport_generic_do_tmr(cmd);
3328 break;
07bde79a 3329 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 3330 transport_write_pending_qf(cmd);
3331 break;
3332 case TRANSPORT_COMPLETE_QF_OK:
3333 transport_complete_qf(cmd);
07bde79a 3334 break;
c66ac9db 3335 default:
f2da9dbd
CH		 3336 pr_err("Unknown t_state: %d for ITT: 0x%08x "
3337 "i_state: %d on SE LUN: %u\n",
3338 cmd->t_state,
e3d6f909
AG		 3339 cmd->se_tfo->get_task_tag(cmd),
3340 cmd->se_tfo->get_cmd_state(cmd),
3341 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 3342 BUG();
3343 }
3344
3345 goto get_cmd;
3346 }
3347
3348out:
cf572a96 3349 WARN_ON(!list_empty(&dev->state_list));
ce8762f6 3350 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 3351 dev->process_thread = NULL;
3352 return 0;
3353}
Linux 6.x block layer and io_uring tree(s)