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target: Remove unused target_core_fabric_ops.get_fabric_sense_len method
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
015487b8 40#include <linux/ratelimit.h>
c66ac9db
NB		 41#include <asm/unaligned.h>
42#include <net/sock.h>
43#include <net/tcp.h>
44#include <scsi/scsi.h>
45#include <scsi/scsi_cmnd.h>
e66ecd50 46#include <scsi/scsi_tcq.h>
c66ac9db
NB		 47
48#include <target/target_core_base.h>
c4795fb2
CH		 49#include <target/target_core_backend.h>
50#include <target/target_core_fabric.h>
c66ac9db
NB		 51#include <target/target_core_configfs.h>
52
e26d99ae 53#include "target_core_internal.h"
c66ac9db 54#include "target_core_alua.h"
c66ac9db 55#include "target_core_pr.h"
c66ac9db
NB		 56#include "target_core_ua.h"
57
35e0e757 58static struct workqueue_struct *target_completion_wq;
c66ac9db 59static struct kmem_cache *se_sess_cache;
c66ac9db 60struct kmem_cache *se_ua_cache;
c66ac9db
NB		 61struct kmem_cache *t10_pr_reg_cache;
62struct kmem_cache *t10_alua_lu_gp_cache;
63struct kmem_cache *t10_alua_lu_gp_mem_cache;
64struct kmem_cache *t10_alua_tg_pt_gp_cache;
65struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
66
c66ac9db 67static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 68static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 69 struct se_device *dev);
05d1c7c0 70static int transport_generic_get_mem(struct se_cmd *cmd);
bc187ea6 71static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
39c05f32 72static void transport_put_cmd(struct se_cmd *cmd);
c66ac9db 73static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
35e0e757 74static void target_complete_ok_work(struct work_struct *work);
c66ac9db 75
e3d6f909 76int init_se_kmem_caches(void)
c66ac9db 77{
c66ac9db
NB		 78 se_sess_cache = kmem_cache_create("se_sess_cache",
79 sizeof(struct se_session), __alignof__(struct se_session),
80 0, NULL);
6708bb27
AG		 81 if (!se_sess_cache) {
82 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 83 " failed\n");
c8e31f26 84 goto out;
c66ac9db
NB		 85 }
86 se_ua_cache = kmem_cache_create("se_ua_cache",
87 sizeof(struct se_ua), __alignof__(struct se_ua),
88 0, NULL);
6708bb27
AG		 89 if (!se_ua_cache) {
90 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 91 goto out_free_sess_cache;
c66ac9db 92 }
c66ac9db
NB		 93 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
94 sizeof(struct t10_pr_registration),
95 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 96 if (!t10_pr_reg_cache) {
97 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 98 " failed\n");
35e0e757 99 goto out_free_ua_cache;
c66ac9db
NB		 100 }
101 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
102 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
103 0, NULL);
6708bb27
AG		 104 if (!t10_alua_lu_gp_cache) {
105 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 106 " failed\n");
35e0e757 107 goto out_free_pr_reg_cache;
c66ac9db
NB		 108 }
109 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
110 sizeof(struct t10_alua_lu_gp_member),
111 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 112 if (!t10_alua_lu_gp_mem_cache) {
113 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 114 "cache failed\n");
35e0e757 115 goto out_free_lu_gp_cache;
c66ac9db
NB		 116 }
117 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
118 sizeof(struct t10_alua_tg_pt_gp),
119 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 120 if (!t10_alua_tg_pt_gp_cache) {
121 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 122 "cache failed\n");
35e0e757 123 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 124 }
125 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
126 "t10_alua_tg_pt_gp_mem_cache",
127 sizeof(struct t10_alua_tg_pt_gp_member),
128 __alignof__(struct t10_alua_tg_pt_gp_member),
129 0, NULL);
6708bb27
AG		 130 if (!t10_alua_tg_pt_gp_mem_cache) {
131 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 132 "mem_t failed\n");
35e0e757 133 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 134 }
135
35e0e757
CH		 136 target_completion_wq = alloc_workqueue("target_completion",
137 WQ_MEM_RECLAIM, 0);
138 if (!target_completion_wq)
139 goto out_free_tg_pt_gp_mem_cache;
140
c66ac9db 141 return 0;
35e0e757
CH		 142
143out_free_tg_pt_gp_mem_cache:
144 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
145out_free_tg_pt_gp_cache:
146 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
147out_free_lu_gp_mem_cache:
148 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
149out_free_lu_gp_cache:
150 kmem_cache_destroy(t10_alua_lu_gp_cache);
151out_free_pr_reg_cache:
152 kmem_cache_destroy(t10_pr_reg_cache);
153out_free_ua_cache:
154 kmem_cache_destroy(se_ua_cache);
155out_free_sess_cache:
156 kmem_cache_destroy(se_sess_cache);
c66ac9db 157out:
e3d6f909 158 return -ENOMEM;
c66ac9db
NB		 159}
160
e3d6f909 161void release_se_kmem_caches(void)
c66ac9db 162{
35e0e757 163 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 164 kmem_cache_destroy(se_sess_cache);
165 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 166 kmem_cache_destroy(t10_pr_reg_cache);
167 kmem_cache_destroy(t10_alua_lu_gp_cache);
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
169 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
170 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 171}
172
e3d6f909
AG		 173/* This code ensures unique mib indexes are handed out. */
174static DEFINE_SPINLOCK(scsi_mib_index_lock);
175static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 176
177/*
178 * Allocate a new row index for the entry type specified
179 */
180u32 scsi_get_new_index(scsi_index_t type)
181{
182 u32 new_index;
183
e3d6f909 184 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 185
e3d6f909
AG		 186 spin_lock(&scsi_mib_index_lock);
187 new_index = ++scsi_mib_index[type];
188 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 189
190 return new_index;
191}
192
dbc5623e 193void transport_subsystem_check_init(void)
c66ac9db
NB		 194{
195 int ret;
283669d2 196 static int sub_api_initialized;
c66ac9db 197
dbc5623e
NB		 198 if (sub_api_initialized)
199 return;
200
c66ac9db
NB		 201 ret = request_module("target_core_iblock");
202 if (ret != 0)
6708bb27 203 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 204
205 ret = request_module("target_core_file");
206 if (ret != 0)
6708bb27 207 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 208
209 ret = request_module("target_core_pscsi");
210 if (ret != 0)
6708bb27 211 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 212
e3d6f909 213 sub_api_initialized = 1;
c66ac9db
NB		 214}
215
216struct se_session *transport_init_session(void)
217{
218 struct se_session *se_sess;
219
220 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 221 if (!se_sess) {
222 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 223 " se_sess_cache\n");
224 return ERR_PTR(-ENOMEM);
225 }
226 INIT_LIST_HEAD(&se_sess->sess_list);
227 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 228 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
a17f091d 229 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 230 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 231
232 return se_sess;
233}
234EXPORT_SYMBOL(transport_init_session);
235
236/*
140854cb 237 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 238 */
239void __transport_register_session(
240 struct se_portal_group *se_tpg,
241 struct se_node_acl *se_nacl,
242 struct se_session *se_sess,
243 void *fabric_sess_ptr)
244{
245 unsigned char buf[PR_REG_ISID_LEN];
246
247 se_sess->se_tpg = se_tpg;
248 se_sess->fabric_sess_ptr = fabric_sess_ptr;
249 /*
250 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
251 *
252 * Only set for struct se_session's that will actually be moving I/O.
253 * eg: *NOT* discovery sessions.
254 */
255 if (se_nacl) {
256 /*
257 * If the fabric module supports an ISID based TransportID,
258 * save this value in binary from the fabric I_T Nexus now.
259 */
e3d6f909 260 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 261 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 262 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 263 &buf[0], PR_REG_ISID_LEN);
264 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
265 }
afb999ff
NB		 266 kref_get(&se_nacl->acl_kref);
267
c66ac9db
NB		 268 spin_lock_irq(&se_nacl->nacl_sess_lock);
269 /*
270 * The se_nacl->nacl_sess pointer will be set to the
271 * last active I_T Nexus for each struct se_node_acl.
272 */
273 se_nacl->nacl_sess = se_sess;
274
275 list_add_tail(&se_sess->sess_acl_list,
276 &se_nacl->acl_sess_list);
277 spin_unlock_irq(&se_nacl->nacl_sess_lock);
278 }
279 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
280
6708bb27 281 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 282 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 283}
284EXPORT_SYMBOL(__transport_register_session);
285
286void transport_register_session(
287 struct se_portal_group *se_tpg,
288 struct se_node_acl *se_nacl,
289 struct se_session *se_sess,
290 void *fabric_sess_ptr)
291{
140854cb
NB		 292 unsigned long flags;
293
294 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 295 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 296 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 297}
298EXPORT_SYMBOL(transport_register_session);
299
4149268e 300void target_release_session(struct kref *kref)
41ac82b6
NB		 301{
302 struct se_session *se_sess = container_of(kref,
303 struct se_session, sess_kref);
304 struct se_portal_group *se_tpg = se_sess->se_tpg;
305
306 se_tpg->se_tpg_tfo->close_session(se_sess);
307}
308
309void target_get_session(struct se_session *se_sess)
310{
311 kref_get(&se_sess->sess_kref);
312}
313EXPORT_SYMBOL(target_get_session);
314
33933a0e 315void target_put_session(struct se_session *se_sess)
41ac82b6 316{
4149268e
JE		 317 struct se_portal_group *tpg = se_sess->se_tpg;
318
319 if (tpg->se_tpg_tfo->put_session != NULL) {
320 tpg->se_tpg_tfo->put_session(se_sess);
321 return;
322 }
33933a0e 323 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 324}
325EXPORT_SYMBOL(target_put_session);
326
afb999ff
NB		 327static void target_complete_nacl(struct kref *kref)
328{
329 struct se_node_acl *nacl = container_of(kref,
330 struct se_node_acl, acl_kref);
331
332 complete(&nacl->acl_free_comp);
333}
334
335void target_put_nacl(struct se_node_acl *nacl)
336{
337 kref_put(&nacl->acl_kref, target_complete_nacl);
338}
339
c66ac9db
NB		 340void transport_deregister_session_configfs(struct se_session *se_sess)
341{
342 struct se_node_acl *se_nacl;
23388864 343 unsigned long flags;
c66ac9db
NB		 344 /*
345 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
346 */
347 se_nacl = se_sess->se_node_acl;
6708bb27 348 if (se_nacl) {
23388864 349 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 350 if (se_nacl->acl_stop == 0)
351 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 352 /*
353 * If the session list is empty, then clear the pointer.
354 * Otherwise, set the struct se_session pointer from the tail
355 * element of the per struct se_node_acl active session list.
356 */
357 if (list_empty(&se_nacl->acl_sess_list))
358 se_nacl->nacl_sess = NULL;
359 else {
360 se_nacl->nacl_sess = container_of(
361 se_nacl->acl_sess_list.prev,
362 struct se_session, sess_acl_list);
363 }
23388864 364 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 365 }
366}
367EXPORT_SYMBOL(transport_deregister_session_configfs);
368
369void transport_free_session(struct se_session *se_sess)
370{
371 kmem_cache_free(se_sess_cache, se_sess);
372}
373EXPORT_SYMBOL(transport_free_session);
374
375void transport_deregister_session(struct se_session *se_sess)
376{
377 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 378 struct target_core_fabric_ops *se_tfo;
c66ac9db 379 struct se_node_acl *se_nacl;
e63a8e19 380 unsigned long flags;
01468346 381 bool comp_nacl = true;
c66ac9db 382
6708bb27 383 if (!se_tpg) {
c66ac9db
NB		 384 transport_free_session(se_sess);
385 return;
386 }
01468346 387 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 388
e63a8e19 389 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 390 list_del(&se_sess->sess_list);
391 se_sess->se_tpg = NULL;
392 se_sess->fabric_sess_ptr = NULL;
e63a8e19 393 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 394
395 /*
396 * Determine if we need to do extra work for this initiator node's
397 * struct se_node_acl if it had been previously dynamically generated.
398 */
399 se_nacl = se_sess->se_node_acl;
01468346
NB		 400
401 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
402 if (se_nacl && se_nacl->dynamic_node_acl) {
403 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
404 list_del(&se_nacl->acl_list);
405 se_tpg->num_node_acls--;
406 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
407 core_tpg_wait_for_nacl_pr_ref(se_nacl);
408 core_free_device_list_for_node(se_nacl, se_tpg);
409 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
410
411 comp_nacl = false;
412 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 413 }
c66ac9db 414 }
01468346 415 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 416
6708bb27 417 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 418 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 419 /*
afb999ff
NB		 420 * If last kref is dropping now for an explict NodeACL, awake sleeping
421 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
422 * removal context.
01468346
NB		 423 */
424 if (se_nacl && comp_nacl == true)
afb999ff 425 target_put_nacl(se_nacl);
01468346 426
afb999ff 427 transport_free_session(se_sess);
c66ac9db
NB		 428}
429EXPORT_SYMBOL(transport_deregister_session);
430
431/*
a1d8b49a 432 * Called with cmd->t_state_lock held.
c66ac9db 433 */
cf572a96 434static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 435{
42bf829e 436 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 437 unsigned long flags;
438
42bf829e
CH		 439 if (!dev)
440 return;
c66ac9db 441
cf572a96
CH		 442 if (cmd->transport_state & CMD_T_BUSY)
443 return;
c66ac9db 444
cf572a96
CH		 445 spin_lock_irqsave(&dev->execute_task_lock, flags);
446 if (cmd->state_active) {
447 list_del(&cmd->state_list);
cf572a96 448 cmd->state_active = false;
c66ac9db 449 }
cf572a96 450 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 451}
452
f7113a47 453static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
c66ac9db
NB		 454{
455 unsigned long flags;
456
a1d8b49a 457 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 458 /*
459 * Determine if IOCTL context caller in requesting the stopping of this
460 * command for LUN shutdown purposes.
461 */
7d680f3b
CH		 462 if (cmd->transport_state & CMD_T_LUN_STOP) {
463 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
464 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 465
7d680f3b 466 cmd->transport_state &= ~CMD_T_ACTIVE;
f7113a47 467 if (remove_from_lists)
cf572a96 468 target_remove_from_state_list(cmd);
a1d8b49a 469 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 470
a1d8b49a 471 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 472 return 1;
473 }
f7113a47
CH		 474
475 if (remove_from_lists) {
476 target_remove_from_state_list(cmd);
477
478 /*
479 * Clear struct se_cmd->se_lun before the handoff to FE.
480 */
481 cmd->se_lun = NULL;
482 }
483
c66ac9db
NB		 484 /*
485 * Determine if frontend context caller is requesting the stopping of
e3d6f909 486 * this command for frontend exceptions.
c66ac9db 487 */
7d680f3b
CH		 488 if (cmd->transport_state & CMD_T_STOP) {
489 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
490 __func__, __LINE__,
e3d6f909 491 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 492
a1d8b49a 493 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 494
a1d8b49a 495 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 496 return 1;
497 }
f7113a47
CH		 498
499 cmd->transport_state &= ~CMD_T_ACTIVE;
500 if (remove_from_lists) {
501 /*
502 * Some fabric modules like tcm_loop can release
503 * their internally allocated I/O reference now and
504 * struct se_cmd now.
505 *
506 * Fabric modules are expected to return '1' here if the
507 * se_cmd being passed is released at this point,
508 * or zero if not being released.
509 */
510 if (cmd->se_tfo->check_stop_free != NULL) {
511 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
512 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 513 }
f7113a47 514 }
c66ac9db 515
a1d8b49a 516 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 517 return 0;
518}
519
520static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
521{
f7113a47 522 return transport_cmd_check_stop(cmd, true);
c66ac9db
NB		 523}
524
525static void transport_lun_remove_cmd(struct se_cmd *cmd)
526{
e3d6f909 527 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 528 unsigned long flags;
529
530 if (!lun)
531 return;
532
a1d8b49a 533 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 534 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
535 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 536 target_remove_from_state_list(cmd);
c66ac9db 537 }
a1d8b49a 538 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 539
c66ac9db 540 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 541 if (!list_empty(&cmd->se_lun_node))
542 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 543 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
544}
545
546void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
547{
c8e31f26 548 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
8dc52b54 549 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 550
551 if (transport_cmd_check_stop_to_fabric(cmd))
552 return;
af877292 553 if (remove)
e6a2573f 554 transport_put_cmd(cmd);
c66ac9db
NB		 555}
556
35e0e757
CH		 557static void target_complete_failure_work(struct work_struct *work)
558{
559 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
560
03e98c9e 561 transport_generic_request_failure(cmd);
35e0e757
CH		 562}
563
6138ed2a 564/*
d5829eac
PB		 565 * Used when asking transport to copy Sense Data from the underlying
566 * Linux/SCSI struct scsi_cmnd
6138ed2a 567 */
d5829eac 568static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 569{
d5829eac 570 unsigned char *buffer = cmd->sense_buffer;
6138ed2a 571 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 572 u32 offset = 0;
573
574 WARN_ON(!cmd->se_lun);
575
576 if (!dev)
d5829eac 577 return NULL;
6138ed2a 578
d5829eac
PB		 579 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
580 return NULL;
6138ed2a
PB		 581
582 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
583
6138ed2a
PB		 584 /* Automatically padded */
585 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
586
d5829eac 587 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 588 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
d5829eac 589 return &buffer[offset];
6138ed2a
PB		 590}
591
5787cacd 592void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 593{
42bf829e 594 struct se_device *dev = cmd->se_dev;
5787cacd 595 int success = scsi_status == GOOD;
c66ac9db 596 unsigned long flags;
c66ac9db 597
5787cacd
CH		 598 cmd->scsi_status = scsi_status;
599
600
a1d8b49a 601 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 602 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 603
c66ac9db 604 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 605 dev->transport->transport_complete(cmd,
606 cmd->t_data_sg,
607 transport_get_sense_buffer(cmd));
608 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 609 success = 1;
c66ac9db
NB		 610 }
611
612 /*
5787cacd 613 * See if we are waiting to complete for an exception condition.
c66ac9db 614 */
cf572a96 615 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 616 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 617 complete(&cmd->task_stop_comp);
c66ac9db
NB		 618 return;
619 }
2235007c
CH		 620
621 if (!success)
7d680f3b 622 cmd->transport_state |= CMD_T_FAILED;
2235007c 623
3d28934a
NB		 624 /*
625 * Check for case where an explict ABORT_TASK has been received
626 * and transport_wait_for_tasks() will be waiting for completion..
627 */
628 if (cmd->transport_state & CMD_T_ABORTED &&
629 cmd->transport_state & CMD_T_STOP) {
630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
631 complete(&cmd->t_transport_stop_comp);
632 return;
633 } else if (cmd->transport_state & CMD_T_FAILED) {
41e16e98 634 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 635 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 636 } else {
35e0e757 637 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 638 }
35e0e757 639
35e0e757 640 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 641 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 642 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 643
35e0e757 644 queue_work(target_completion_wq, &cmd->work);
c66ac9db 645}
6bb35e00
CH		 646EXPORT_SYMBOL(target_complete_cmd);
647
cf572a96 648static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 649{
cf572a96
CH		 650 struct se_device *dev = cmd->se_dev;
651 unsigned long flags;
c66ac9db 652
cf572a96
CH		 653 spin_lock_irqsave(&dev->execute_task_lock, flags);
654 if (!cmd->state_active) {
655 list_add_tail(&cmd->state_list, &dev->state_list);
656 cmd->state_active = true;
c66ac9db 657 }
cf572a96 658 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 659}
660
07bde79a 661/*
f147abb4 662 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 663 */
7a6f0a1e
CH		 664static void transport_write_pending_qf(struct se_cmd *cmd);
665static void transport_complete_qf(struct se_cmd *cmd);
07bde79a
NB		 666
667static void target_qf_do_work(struct work_struct *work)
668{
669 struct se_device *dev = container_of(work, struct se_device,
670 qf_work_queue);
bcac364a 671 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 672 struct se_cmd *cmd, *cmd_tmp;
673
674 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 675 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
676 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 677
bcac364a 678 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 679 list_del(&cmd->se_qf_node);
680 atomic_dec(&dev->dev_qf_count);
681 smp_mb__after_atomic_dec();
07bde79a 682
6708bb27 683 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 684 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 685 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 686 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
687 : "UNKNOWN");
f7a5cc0b 688
7a6f0a1e
CH		 689 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
690 transport_write_pending_qf(cmd);
691 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
692 transport_complete_qf(cmd);
07bde79a 693 }
07bde79a
NB		 694}
695
c66ac9db
NB		 696unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
697{
698 switch (cmd->data_direction) {
699 case DMA_NONE:
700 return "NONE";
701 case DMA_FROM_DEVICE:
702 return "READ";
703 case DMA_TO_DEVICE:
704 return "WRITE";
705 case DMA_BIDIRECTIONAL:
706 return "BIDI";
707 default:
708 break;
709 }
710
711 return "UNKNOWN";
712}
713
714void transport_dump_dev_state(
715 struct se_device *dev,
716 char *b,
717 int *bl)
718{
719 *bl += sprintf(b + *bl, "Status: ");
720 switch (dev->dev_status) {
721 case TRANSPORT_DEVICE_ACTIVATED:
722 *bl += sprintf(b + *bl, "ACTIVATED");
723 break;
724 case TRANSPORT_DEVICE_DEACTIVATED:
725 *bl += sprintf(b + *bl, "DEACTIVATED");
726 break;
727 case TRANSPORT_DEVICE_SHUTDOWN:
728 *bl += sprintf(b + *bl, "SHUTDOWN");
729 break;
730 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
731 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
732 *bl += sprintf(b + *bl, "OFFLINE");
733 break;
734 default:
735 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
736 break;
737 }
738
5f41a31d 739 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd
NB		 740 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
741 dev->se_sub_dev->se_dev_attrib.block_size,
742 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
c66ac9db
NB		 743 *bl += sprintf(b + *bl, " ");
744}
745
c66ac9db
NB		 746void transport_dump_vpd_proto_id(
747 struct t10_vpd *vpd,
748 unsigned char *p_buf,
749 int p_buf_len)
750{
751 unsigned char buf[VPD_TMP_BUF_SIZE];
752 int len;
753
754 memset(buf, 0, VPD_TMP_BUF_SIZE);
755 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
756
757 switch (vpd->protocol_identifier) {
758 case 0x00:
759 sprintf(buf+len, "Fibre Channel\n");
760 break;
761 case 0x10:
762 sprintf(buf+len, "Parallel SCSI\n");
763 break;
764 case 0x20:
765 sprintf(buf+len, "SSA\n");
766 break;
767 case 0x30:
768 sprintf(buf+len, "IEEE 1394\n");
769 break;
770 case 0x40:
771 sprintf(buf+len, "SCSI Remote Direct Memory Access"
772 " Protocol\n");
773 break;
774 case 0x50:
775 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
776 break;
777 case 0x60:
778 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
779 break;
780 case 0x70:
781 sprintf(buf+len, "Automation/Drive Interface Transport"
782 " Protocol\n");
783 break;
784 case 0x80:
785 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
786 break;
787 default:
788 sprintf(buf+len, "Unknown 0x%02x\n",
789 vpd->protocol_identifier);
790 break;
791 }
792
793 if (p_buf)
794 strncpy(p_buf, buf, p_buf_len);
795 else
6708bb27 796 pr_debug("%s", buf);
c66ac9db
NB		 797}
798
799void
800transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
801{
802 /*
803 * Check if the Protocol Identifier Valid (PIV) bit is set..
804 *
805 * from spc3r23.pdf section 7.5.1
806 */
807 if (page_83[1] & 0x80) {
808 vpd->protocol_identifier = (page_83[0] & 0xf0);
809 vpd->protocol_identifier_set = 1;
810 transport_dump_vpd_proto_id(vpd, NULL, 0);
811 }
812}
813EXPORT_SYMBOL(transport_set_vpd_proto_id);
814
815int transport_dump_vpd_assoc(
816 struct t10_vpd *vpd,
817 unsigned char *p_buf,
818 int p_buf_len)
819{
820 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 821 int ret = 0;
822 int len;
c66ac9db
NB		 823
824 memset(buf, 0, VPD_TMP_BUF_SIZE);
825 len = sprintf(buf, "T10 VPD Identifier Association: ");
826
827 switch (vpd->association) {
828 case 0x00:
829 sprintf(buf+len, "addressed logical unit\n");
830 break;
831 case 0x10:
832 sprintf(buf+len, "target port\n");
833 break;
834 case 0x20:
835 sprintf(buf+len, "SCSI target device\n");
836 break;
837 default:
838 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 839 ret = -EINVAL;
c66ac9db
NB		 840 break;
841 }
842
843 if (p_buf)
844 strncpy(p_buf, buf, p_buf_len);
845 else
6708bb27 846 pr_debug("%s", buf);
c66ac9db
NB		 847
848 return ret;
849}
850
851int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
852{
853 /*
854 * The VPD identification association..
855 *
856 * from spc3r23.pdf Section 7.6.3.1 Table 297
857 */
858 vpd->association = (page_83[1] & 0x30);
859 return transport_dump_vpd_assoc(vpd, NULL, 0);
860}
861EXPORT_SYMBOL(transport_set_vpd_assoc);
862
863int transport_dump_vpd_ident_type(
864 struct t10_vpd *vpd,
865 unsigned char *p_buf,
866 int p_buf_len)
867{
868 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 869 int ret = 0;
870 int len;
c66ac9db
NB		 871
872 memset(buf, 0, VPD_TMP_BUF_SIZE);
873 len = sprintf(buf, "T10 VPD Identifier Type: ");
874
875 switch (vpd->device_identifier_type) {
876 case 0x00:
877 sprintf(buf+len, "Vendor specific\n");
878 break;
879 case 0x01:
880 sprintf(buf+len, "T10 Vendor ID based\n");
881 break;
882 case 0x02:
883 sprintf(buf+len, "EUI-64 based\n");
884 break;
885 case 0x03:
886 sprintf(buf+len, "NAA\n");
887 break;
888 case 0x04:
889 sprintf(buf+len, "Relative target port identifier\n");
890 break;
891 case 0x08:
892 sprintf(buf+len, "SCSI name string\n");
893 break;
894 default:
895 sprintf(buf+len, "Unsupported: 0x%02x\n",
896 vpd->device_identifier_type);
e3d6f909 897 ret = -EINVAL;
c66ac9db
NB		 898 break;
899 }
900
e3d6f909
AG		 901 if (p_buf) {
902 if (p_buf_len < strlen(buf)+1)
903 return -EINVAL;
c66ac9db 904 strncpy(p_buf, buf, p_buf_len);
e3d6f909 905 } else {
6708bb27 906 pr_debug("%s", buf);
e3d6f909 907 }
c66ac9db
NB		 908
909 return ret;
910}
911
912int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
913{
914 /*
915 * The VPD identifier type..
916 *
917 * from spc3r23.pdf Section 7.6.3.1 Table 298
918 */
919 vpd->device_identifier_type = (page_83[1] & 0x0f);
920 return transport_dump_vpd_ident_type(vpd, NULL, 0);
921}
922EXPORT_SYMBOL(transport_set_vpd_ident_type);
923
924int transport_dump_vpd_ident(
925 struct t10_vpd *vpd,
926 unsigned char *p_buf,
927 int p_buf_len)
928{
929 unsigned char buf[VPD_TMP_BUF_SIZE];
930 int ret = 0;
931
932 memset(buf, 0, VPD_TMP_BUF_SIZE);
933
934 switch (vpd->device_identifier_code_set) {
935 case 0x01: /* Binary */
936 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
937 &vpd->device_identifier[0]);
938 break;
939 case 0x02: /* ASCII */
940 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
941 &vpd->device_identifier[0]);
942 break;
943 case 0x03: /* UTF-8 */
944 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
945 &vpd->device_identifier[0]);
946 break;
947 default:
948 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
949 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 950 ret = -EINVAL;
c66ac9db
NB		 951 break;
952 }
953
954 if (p_buf)
955 strncpy(p_buf, buf, p_buf_len);
956 else
6708bb27 957 pr_debug("%s", buf);
c66ac9db
NB		 958
959 return ret;
960}
961
962int
963transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
964{
965 static const char hex_str[] = "0123456789abcdef";
966 int j = 0, i = 4; /* offset to start of the identifer */
967
968 /*
969 * The VPD Code Set (encoding)
970 *
971 * from spc3r23.pdf Section 7.6.3.1 Table 296
972 */
973 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
974 switch (vpd->device_identifier_code_set) {
975 case 0x01: /* Binary */
976 vpd->device_identifier[j++] =
977 hex_str[vpd->device_identifier_type];
978 while (i < (4 + page_83[3])) {
979 vpd->device_identifier[j++] =
980 hex_str[(page_83[i] & 0xf0) >> 4];
981 vpd->device_identifier[j++] =
982 hex_str[page_83[i] & 0x0f];
983 i++;
984 }
985 break;
986 case 0x02: /* ASCII */
987 case 0x03: /* UTF-8 */
988 while (i < (4 + page_83[3]))
989 vpd->device_identifier[j++] = page_83[i++];
990 break;
991 default:
992 break;
993 }
994
995 return transport_dump_vpd_ident(vpd, NULL, 0);
996}
997EXPORT_SYMBOL(transport_set_vpd_ident);
998
999static void core_setup_task_attr_emulation(struct se_device *dev)
1000{
1001 /*
1002 * If this device is from Target_Core_Mod/pSCSI, disable the
1003 * SAM Task Attribute emulation.
1004 *
1005 * This is currently not available in upsream Linux/SCSI Target
1006 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1007 */
e3d6f909 1008 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1009 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1010 return;
1011 }
1012
1013 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1014 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1015 " device\n", dev->transport->name,
1016 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1017}
1018
1019static void scsi_dump_inquiry(struct se_device *dev)
1020{
e3d6f909 1021 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1022 char buf[17];
c66ac9db
NB		 1023 int i, device_type;
1024 /*
1025 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1026 */
c66ac9db
NB		 1027 for (i = 0; i < 8; i++)
1028 if (wwn->vendor[i] >= 0x20)
e59a41b6 1029 buf[i] = wwn->vendor[i];
c66ac9db 1030 else
e59a41b6
SAS		 1031 buf[i] = ' ';
1032 buf[i] = '\0';
1033 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1034
c66ac9db
NB		 1035 for (i = 0; i < 16; i++)
1036 if (wwn->model[i] >= 0x20)
e59a41b6 1037 buf[i] = wwn->model[i];
c66ac9db 1038 else
e59a41b6
SAS		 1039 buf[i] = ' ';
1040 buf[i] = '\0';
1041 pr_debug(" Model: %s\n", buf);
c66ac9db 1042
c66ac9db
NB		 1043 for (i = 0; i < 4; i++)
1044 if (wwn->revision[i] >= 0x20)
e59a41b6 1045 buf[i] = wwn->revision[i];
c66ac9db 1046 else
e59a41b6
SAS		 1047 buf[i] = ' ';
1048 buf[i] = '\0';
1049 pr_debug(" Revision: %s\n", buf);
c66ac9db 1050
e3d6f909 1051 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1052 pr_debug(" Type: %s ", scsi_device_type(device_type));
1053 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1054 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1055}
1056
1057struct se_device *transport_add_device_to_core_hba(
1058 struct se_hba *hba,
1059 struct se_subsystem_api *transport,
1060 struct se_subsystem_dev *se_dev,
1061 u32 device_flags,
1062 void *transport_dev,
1063 struct se_dev_limits *dev_limits,
1064 const char *inquiry_prod,
1065 const char *inquiry_rev)
1066{
12a18bdc 1067 int force_pt;
c66ac9db
NB		 1068 struct se_device *dev;
1069
1070 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1071 if (!dev) {
1072 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1073 return NULL;
1074 }
c66ac9db
NB		 1075
1076 dev->dev_flags = device_flags;
1077 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1078 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1079 dev->se_hba = hba;
1080 dev->se_sub_dev = se_dev;
1081 dev->transport = transport;
c66ac9db
NB		 1082 INIT_LIST_HEAD(&dev->dev_list);
1083 INIT_LIST_HEAD(&dev->dev_sep_list);
1084 INIT_LIST_HEAD(&dev->dev_tmr_list);
c66ac9db 1085 INIT_LIST_HEAD(&dev->delayed_cmd_list);
cf572a96 1086 INIT_LIST_HEAD(&dev->state_list);
07bde79a 1087 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1088 spin_lock_init(&dev->execute_task_lock);
1089 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1090 spin_lock_init(&dev->dev_reservation_lock);
1091 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1092 spin_lock_init(&dev->se_port_lock);
1093 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1094 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1095 atomic_set(&dev->dev_ordered_id, 0);
1096
1097 se_dev_set_default_attribs(dev, dev_limits);
1098
1099 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1100 dev->creation_time = get_jiffies_64();
1101 spin_lock_init(&dev->stats_lock);
1102
1103 spin_lock(&hba->device_lock);
1104 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1105 hba->dev_count++;
1106 spin_unlock(&hba->device_lock);
1107 /*
1108 * Setup the SAM Task Attribute emulation for struct se_device
1109 */
1110 core_setup_task_attr_emulation(dev);
1111 /*
1112 * Force PR and ALUA passthrough emulation with internal object use.
1113 */
1114 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1115 /*
1116 * Setup the Reservations infrastructure for struct se_device
1117 */
1118 core_setup_reservations(dev, force_pt);
1119 /*
1120 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1121 */
1122 if (core_setup_alua(dev, force_pt) < 0)
2962846d 1123 goto err_dev_list;
c66ac9db
NB		 1124
1125 /*
1126 * Startup the struct se_device processing thread
1127 */
af877292
CH		 1128 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1129 dev->transport->name);
1130 if (!dev->tmr_wq) {
1131 pr_err("Unable to create tmr workqueue for %s\n",
e3d6f909 1132 dev->transport->name);
2962846d 1133 goto err_dev_list;
c66ac9db 1134 }
07bde79a
NB		 1135 /*
1136 * Setup work_queue for QUEUE_FULL
1137 */
1138 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1139 /*
1140 * Preload the initial INQUIRY const values if we are doing
1141 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1142 * passthrough because this is being provided by the backend LLD.
1143 * This is required so that transport_get_inquiry() copies these
1144 * originals once back into DEV_T10_WWN(dev) for the virtual device
1145 * setup.
1146 */
e3d6f909 1147 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1148 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1149 pr_err("All non TCM/pSCSI plugins require"
c66ac9db 1150 " INQUIRY consts\n");
2962846d 1151 goto err_wq;
c66ac9db
NB		 1152 }
1153
e3d6f909
AG		 1154 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1155 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1156 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1157 }
1158 scsi_dump_inquiry(dev);
1159
12a18bdc 1160 return dev;
c66ac9db 1161
2962846d
DC		 1162err_wq:
1163 destroy_workqueue(dev->tmr_wq);
1164err_dev_list:
c66ac9db
NB		 1165 spin_lock(&hba->device_lock);
1166 list_del(&dev->dev_list);
1167 hba->dev_count--;
1168 spin_unlock(&hba->device_lock);
1169
1170 se_release_vpd_for_dev(dev);
1171
c66ac9db
NB		 1172 kfree(dev);
1173
1174 return NULL;
1175}
1176EXPORT_SYMBOL(transport_add_device_to_core_hba);
1177
1fd032ee 1178int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1179{
1180 struct se_device *dev = cmd->se_dev;
1181
1182 if (cmd->unknown_data_length) {
1183 cmd->data_length = size;
1184 } else if (size != cmd->data_length) {
1185 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1186 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1187 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1188 cmd->data_length, size, cmd->t_task_cdb[0]);
1189
9b3b8041
CH		 1190 if (cmd->data_direction == DMA_TO_DEVICE) {
1191 pr_err("Rejecting underflow/overflow"
1192 " WRITE data\n");
1193 goto out_invalid_cdb_field;
1194 }
1195 /*
1196 * Reject READ_* or WRITE_* with overflow/underflow for
1197 * type SCF_SCSI_DATA_CDB.
1198 */
1199 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
1200 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1201 " CDB on non 512-byte sector setup subsystem"
1202 " plugin: %s\n", dev->transport->name);
1203 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1204 goto out_invalid_cdb_field;
1205 }
4c054ba6
NB		 1206 /*
1207 * For the overflow case keep the existing fabric provided
1208 * ->data_length. Otherwise for the underflow case, reset
1209 * ->data_length to the smaller SCSI expected data transfer
1210 * length.
1211 */
9b3b8041
CH		 1212 if (size > cmd->data_length) {
1213 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1214 cmd->residual_count = (size - cmd->data_length);
1215 } else {
1216 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1217 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1218 cmd->data_length = size;
9b3b8041 1219 }
9b3b8041
CH		 1220 }
1221
1222 return 0;
1223
1224out_invalid_cdb_field:
1225 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1226 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1227 return -EINVAL;
1228}
1229
c66ac9db
NB		 1230/*
1231 * Used by fabric modules containing a local struct se_cmd within their
1232 * fabric dependent per I/O descriptor.
1233 */
1234void transport_init_se_cmd(
1235 struct se_cmd *cmd,
1236 struct target_core_fabric_ops *tfo,
1237 struct se_session *se_sess,
1238 u32 data_length,
1239 int data_direction,
1240 int task_attr,
1241 unsigned char *sense_buffer)
1242{
5951146d
AG		 1243 INIT_LIST_HEAD(&cmd->se_lun_node);
1244 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1245 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1246 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1247 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1248 init_completion(&cmd->transport_lun_fe_stop_comp);
1249 init_completion(&cmd->transport_lun_stop_comp);
1250 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1251 init_completion(&cmd->cmd_wait_comp);
cf572a96 1252 init_completion(&cmd->task_stop_comp);
a1d8b49a 1253 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1254 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1255
1256 cmd->se_tfo = tfo;
1257 cmd->se_sess = se_sess;
1258 cmd->data_length = data_length;
1259 cmd->data_direction = data_direction;
1260 cmd->sam_task_attr = task_attr;
1261 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1262
1263 cmd->state_active = false;
c66ac9db
NB		 1264}
1265EXPORT_SYMBOL(transport_init_se_cmd);
1266
1267static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1268{
1269 /*
1270 * Check if SAM Task Attribute emulation is enabled for this
1271 * struct se_device storage object
1272 */
5951146d 1273 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1274 return 0;
1275
e66ecd50 1276 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1277 pr_debug("SAM Task Attribute ACA"
c66ac9db 1278 " emulation is not supported\n");
e3d6f909 1279 return -EINVAL;
c66ac9db
NB		 1280 }
1281 /*
1282 * Used to determine when ORDERED commands should go from
1283 * Dormant to Active status.
1284 */
5951146d 1285 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1286 smp_mb__after_atomic_inc();
6708bb27 1287 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1288 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1289 cmd->se_dev->transport->name);
c66ac9db
NB		 1290 return 0;
1291}
1292
a12f41f8 1293/* target_setup_cmd_from_cdb():
c66ac9db
NB		 1294 *
1295 * Called from fabric RX Thread.
1296 */
a12f41f8 1297int target_setup_cmd_from_cdb(
c66ac9db
NB		 1298 struct se_cmd *cmd,
1299 unsigned char *cdb)
1300{
cb4f4d3c
CH		 1301 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1302 u32 pr_reg_type = 0;
1303 u8 alua_ascq = 0;
1304 unsigned long flags;
c66ac9db
NB		 1305 int ret;
1306
c66ac9db
NB		 1307 /*
1308 * Ensure that the received CDB is less than the max (252 + 8) bytes
1309 * for VARIABLE_LENGTH_CMD
1310 */
1311 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1312 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1313 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1314 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1315 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1316 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1317 return -EINVAL;
c66ac9db
NB		 1318 }
1319 /*
1320 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1321 * allocate the additional extended CDB buffer now.. Otherwise
1322 * setup the pointer from __t_task_cdb to t_task_cdb.
1323 */
a1d8b49a
AG		 1324 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1325 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1326 GFP_KERNEL);
6708bb27
AG		 1327 if (!cmd->t_task_cdb) {
1328 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1329 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1330 scsi_command_size(cdb),
a1d8b49a 1331 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1332 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1333 cmd->scsi_sense_reason =
1334 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1335 return -ENOMEM;
c66ac9db
NB		 1336 }
1337 } else
a1d8b49a 1338 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1339 /*
a1d8b49a 1340 * Copy the original CDB into cmd->
c66ac9db 1341 */
a1d8b49a 1342 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1343
1344 /*
1345 * Check for an existing UNIT ATTENTION condition
1346 */
1347 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1348 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1349 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1350 return -EINVAL;
1351 }
1352
1353 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1354 if (ret != 0) {
1355 /*
1356 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1357 * The ALUA additional sense code qualifier (ASCQ) is determined
1358 * by the ALUA primary or secondary access state..
1359 */
1360 if (ret > 0) {
1361 pr_debug("[%s]: ALUA TG Port not available, "
1362 "SenseKey: NOT_READY, ASC/ASCQ: "
1363 "0x04/0x%02x\n",
1364 cmd->se_tfo->get_fabric_name(), alua_ascq);
1365
1366 transport_set_sense_codes(cmd, 0x04, alua_ascq);
1367 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1368 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1369 return -EINVAL;
1370 }
1371 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1372 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1373 return -EINVAL;
1374 }
1375
1376 /*
1377 * Check status for SPC-3 Persistent Reservations
1378 */
1379 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1380 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1381 cmd, cdb, pr_reg_type) != 0) {
1382 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1383 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1384 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1385 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1386 return -EBUSY;
1387 }
1388 /*
1389 * This means the CDB is allowed for the SCSI Initiator port
1390 * when said port is *NOT* holding the legacy SPC-2 or
1391 * SPC-3 Persistent Reservation.
1392 */
1393 }
1394
1fd032ee 1395 ret = cmd->se_dev->transport->parse_cdb(cmd);
c66ac9db
NB		 1396 if (ret < 0)
1397 return ret;
cb4f4d3c
CH		 1398
1399 spin_lock_irqsave(&cmd->t_state_lock, flags);
1400 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1401 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1402
c66ac9db
NB		 1403 /*
1404 * Check for SAM Task Attribute Emulation
1405 */
1406 if (transport_check_alloc_task_attr(cmd) < 0) {
1407 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1408 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1409 return -EINVAL;
c66ac9db
NB		 1410 }
1411 spin_lock(&cmd->se_lun->lun_sep_lock);
1412 if (cmd->se_lun->lun_sep)
1413 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1414 spin_unlock(&cmd->se_lun->lun_sep_lock);
1415 return 0;
1416}
a12f41f8 1417EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1418
695434e1
NB		 1419/*
1420 * Used by fabric module frontends to queue tasks directly.
1421 * Many only be used from process context only
1422 */
1423int transport_handle_cdb_direct(
1424 struct se_cmd *cmd)
1425{
dd8ae59d
NB		 1426 int ret;
1427
695434e1
NB		 1428 if (!cmd->se_lun) {
1429 dump_stack();
6708bb27 1430 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1431 return -EINVAL;
1432 }
1433 if (in_interrupt()) {
1434 dump_stack();
6708bb27 1435 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1436 " from interrupt context\n");
1437 return -EINVAL;
1438 }
dd8ae59d 1439 /*
af877292
CH		 1440 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1441 * outstanding descriptors are handled correctly during shutdown via
1442 * transport_wait_for_tasks()
dd8ae59d
NB		 1443 *
1444 * Also, we don't take cmd->t_state_lock here as we only expect
1445 * this to be called for initial descriptor submission.
1446 */
1447 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1448 cmd->transport_state |= CMD_T_ACTIVE;
1449
dd8ae59d
NB		 1450 /*
1451 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1452 * so follow TRANSPORT_NEW_CMD processing thread context usage
1453 * and call transport_generic_request_failure() if necessary..
1454 */
1455 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1456 if (ret < 0)
1457 transport_generic_request_failure(cmd);
1458
dd8ae59d 1459 return 0;
695434e1
NB		 1460}
1461EXPORT_SYMBOL(transport_handle_cdb_direct);
1462
a6360785
NB		 1463/**
1464 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1465 *
1466 * @se_cmd: command descriptor to submit
1467 * @se_sess: associated se_sess for endpoint
1468 * @cdb: pointer to SCSI CDB
1469 * @sense: pointer to SCSI sense buffer
1470 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1471 * @data_length: fabric expected data transfer length
1472 * @task_addr: SAM task attribute
1473 * @data_dir: DMA data direction
1474 * @flags: flags for command submission from target_sc_flags_tables
1475 *
d6dfc868
RD		 1476 * Returns non zero to signal active I/O shutdown failure. All other
1477 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1478 * but still return zero here.
1479 *
a6360785
NB		 1480 * This may only be called from process context, and also currently
1481 * assumes internal allocation of fabric payload buffer by target-core.
1482 **/
d6dfc868 1483int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1484 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1485 u32 data_length, int task_attr, int data_dir, int flags)
1486{
1487 struct se_portal_group *se_tpg;
1488 int rc;
1489
1490 se_tpg = se_sess->se_tpg;
1491 BUG_ON(!se_tpg);
1492 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1493 BUG_ON(in_interrupt());
1494 /*
1495 * Initialize se_cmd for target operation. From this point
1496 * exceptions are handled by sending exception status via
1497 * target_core_fabric_ops->queue_status() callback
1498 */
1499 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1500 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1501 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1502 se_cmd->unknown_data_length = 1;
a6360785
NB		 1503 /*
1504 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1505 * se_sess->sess_cmd_list. A second kref_get here is necessary
1506 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1507 * kref_put() to happen during fabric packet acknowledgement.
1508 */
bc187ea6
RD		 1509 rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1510 if (rc)
d6dfc868 1511 return rc;
a6360785
NB		 1512 /*
1513 * Signal bidirectional data payloads to target-core
1514 */
1515 if (flags & TARGET_SCF_BIDI_OP)
1516 se_cmd->se_cmd_flags |= SCF_BIDI;
1517 /*
1518 * Locate se_lun pointer and attach it to struct se_cmd
1519 */
735703ca
NB		 1520 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1521 transport_send_check_condition_and_sense(se_cmd,
1522 se_cmd->scsi_sense_reason, 0);
1523 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1524 return 0;
735703ca 1525 }
d6e0175c 1526
a12f41f8 1527 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca
NB		 1528 if (rc != 0) {
1529 transport_generic_request_failure(se_cmd);
d6dfc868 1530 return 0;
735703ca 1531 }
11e319ed
AG		 1532
1533 /*
1534 * Check if we need to delay processing because of ALUA
1535 * Active/NonOptimized primary access state..
1536 */
1537 core_alua_check_nonop_delay(se_cmd);
1538
a6360785 1539 transport_handle_cdb_direct(se_cmd);
d6dfc868 1540 return 0;
a6360785
NB		 1541}
1542EXPORT_SYMBOL(target_submit_cmd);
1543
9f0d05c2
NB		 1544static void target_complete_tmr_failure(struct work_struct *work)
1545{
1546 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1547
1548 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1549 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1550 transport_generic_free_cmd(se_cmd, 0);
1551}
1552
ea98d7f9
AG		 1553/**
1554 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1555 * for TMR CDBs
1556 *
1557 * @se_cmd: command descriptor to submit
1558 * @se_sess: associated se_sess for endpoint
1559 * @sense: pointer to SCSI sense buffer
1560 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1561 * @fabric_context: fabric context for TMR req
1562 * @tm_type: Type of TM request
c0974f89
NB		 1563 * @gfp: gfp type for caller
1564 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1565 * @flags: submit cmd flags
ea98d7f9
AG		 1566 *
1567 * Callable from all contexts.
1568 **/
1569
c7042cae 1570int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1571 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1572 void *fabric_tmr_ptr, unsigned char tm_type,
1573 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1574{
1575 struct se_portal_group *se_tpg;
1576 int ret;
1577
1578 se_tpg = se_sess->se_tpg;
1579 BUG_ON(!se_tpg);
1580
1581 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1582 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1583 /*
1584 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1585 * allocation failure.
1586 */
c0974f89 1587 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1588 if (ret < 0)
1589 return -ENOMEM;
ea98d7f9 1590
c0974f89
NB		 1591 if (tm_type == TMR_ABORT_TASK)
1592 se_cmd->se_tmr_req->ref_task_tag = tag;
1593
ea98d7f9 1594 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1595 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1596 if (ret) {
1597 core_tmr_release_req(se_cmd->se_tmr_req);
1598 return ret;
1599 }
ea98d7f9 1600
ea98d7f9
AG		 1601 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1602 if (ret) {
9f0d05c2
NB		 1603 /*
1604 * For callback during failure handling, push this work off
1605 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1606 */
1607 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1608 schedule_work(&se_cmd->work);
c7042cae 1609 return 0;
ea98d7f9
AG		 1610 }
1611 transport_generic_handle_tmr(se_cmd);
c7042cae 1612 return 0;
ea98d7f9
AG		 1613}
1614EXPORT_SYMBOL(target_submit_tmr);
1615
cdbb70bb 1616/*
cf572a96 1617 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1618 * has completed.
1619 */
cf572a96 1620bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1621{
cdbb70bb
CH		 1622 bool was_active = false;
1623
cf572a96
CH		 1624 if (cmd->transport_state & CMD_T_BUSY) {
1625 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1626 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1627
cf572a96
CH		 1628 pr_debug("cmd %p waiting to complete\n", cmd);
1629 wait_for_completion(&cmd->task_stop_comp);
1630 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1631
1632 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1633 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1634 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1635 was_active = true;
1636 }
1637
cdbb70bb
CH		 1638 return was_active;
1639}
1640
c66ac9db
NB		 1641/*
1642 * Handle SAM-esque emulation for generic transport request failures.
1643 */
2fbff127 1644void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1645{
07bde79a
NB		 1646 int ret = 0;
1647
6708bb27 1648 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1649 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1650 cmd->t_task_cdb[0]);
03e98c9e 1651 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1652 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1653 cmd->t_state, cmd->scsi_sense_reason);
d43d6aea 1654 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1655 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1656 (cmd->transport_state & CMD_T_STOP) != 0,
1657 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1658
c66ac9db
NB		 1659 /*
1660 * For SAM Task Attribute emulation for failed struct se_cmd
1661 */
1662 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1663 transport_complete_task_attr(cmd);
1664
03e98c9e
NB		 1665 switch (cmd->scsi_sense_reason) {
1666 case TCM_NON_EXISTENT_LUN:
1667 case TCM_UNSUPPORTED_SCSI_OPCODE:
1668 case TCM_INVALID_CDB_FIELD:
1669 case TCM_INVALID_PARAMETER_LIST:
1670 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1671 case TCM_UNKNOWN_MODE_PAGE:
1672 case TCM_WRITE_PROTECTED:
e2397c70 1673 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1674 case TCM_CHECK_CONDITION_ABORT_CMD:
1675 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1676 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1677 break;
03e98c9e 1678 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1679 /*
1680 * No SENSE Data payload for this case, set SCSI Status
1681 * and queue the response to $FABRIC_MOD.
1682 *
1683 * Uses linux/include/scsi/scsi.h SAM status codes defs
1684 */
1685 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1686 /*
1687 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1688 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1689 * CONFLICT STATUS.
1690 *
1691 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1692 */
e3d6f909
AG		 1693 if (cmd->se_sess &&
1694 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1695 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1696 cmd->orig_fe_lun, 0x2C,
1697 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1698
07bde79a 1699 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1700 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1701 goto queue_full;
c66ac9db 1702 goto check_stop;
c66ac9db 1703 default:
6708bb27 1704 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1705 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1706 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1707 break;
1708 }
f3146437 1709
03e98c9e
NB		 1710 ret = transport_send_check_condition_and_sense(cmd,
1711 cmd->scsi_sense_reason, 0);
1712 if (ret == -EAGAIN || ret == -ENOMEM)
1713 goto queue_full;
07bde79a 1714
c66ac9db
NB		 1715check_stop:
1716 transport_lun_remove_cmd(cmd);
6708bb27 1717 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1718 ;
07bde79a
NB		 1719 return;
1720
1721queue_full:
e057f533
CH		 1722 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1723 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1724}
2fbff127 1725EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1726
5f41a31d 1727static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1728{
0c2ad7d1 1729 int error = 0;
5f41a31d
CH		 1730
1731 spin_lock_irq(&cmd->t_state_lock);
1732 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1733 spin_unlock_irq(&cmd->t_state_lock);
1734
1735 if (cmd->execute_cmd)
1736 error = cmd->execute_cmd(cmd);
5f41a31d
CH		 1737
1738 if (error) {
1739 spin_lock_irq(&cmd->t_state_lock);
1740 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1741 spin_unlock_irq(&cmd->t_state_lock);
1742
1743 transport_generic_request_failure(cmd);
1744 }
1745}
1746
70baf0ab 1747void target_execute_cmd(struct se_cmd *cmd)
5f41a31d
CH		 1748{
1749 struct se_device *dev = cmd->se_dev;
1750
d59a02b4
CH		 1751 /*
1752 * If the received CDB has aleady been aborted stop processing it here.
1753 */
1754 if (transport_check_aborted_status(cmd, 1))
1755 return;
1756
f7113a47
CH		 1757 /*
1758 * Determine if IOCTL context caller in requesting the stopping of this
1759 * command for LUN shutdown purposes.
1760 */
1761 spin_lock_irq(&cmd->t_state_lock);
1762 if (cmd->transport_state & CMD_T_LUN_STOP) {
1763 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1764 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1765
1766 cmd->transport_state &= ~CMD_T_ACTIVE;
1767 spin_unlock_irq(&cmd->t_state_lock);
1768 complete(&cmd->transport_lun_stop_comp);
1769 return;
1770 }
1771 /*
1772 * Determine if frontend context caller is requesting the stopping of
1773 * this command for frontend exceptions.
1774 */
1775 if (cmd->transport_state & CMD_T_STOP) {
1776 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1777 __func__, __LINE__,
1778 cmd->se_tfo->get_task_tag(cmd));
1779
1780 spin_unlock_irq(&cmd->t_state_lock);
1781 complete(&cmd->t_transport_stop_comp);
5f41a31d 1782 return;
f7113a47
CH		 1783 }
1784
1785 cmd->t_state = TRANSPORT_PROCESSING;
1786 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d
CH		 1787
1788 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1789 goto execute;
1790
c66ac9db 1791 /*
25985edc 1792 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1793 * to allow the passed struct se_cmd list of tasks to the front of the list.
1794 */
5f41a31d
CH		 1795 switch (cmd->sam_task_attr) {
1796 case MSG_HEAD_TAG:
1797 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1798 "se_ordered_id: %u\n",
1799 cmd->t_task_cdb[0], cmd->se_ordered_id);
1800 goto execute;
1801 case MSG_ORDERED_TAG:
1802 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1803 smp_mb__after_atomic_inc();
1804
5f41a31d
CH		 1805 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1806 " se_ordered_id: %u\n",
1807 cmd->t_task_cdb[0], cmd->se_ordered_id);
1808
c66ac9db 1809 /*
5f41a31d
CH		 1810 * Execute an ORDERED command if no other older commands
1811 * exist that need to be completed first.
c66ac9db 1812 */
5f41a31d
CH		 1813 if (!atomic_read(&dev->simple_cmds))
1814 goto execute;
1815 break;
1816 default:
c66ac9db
NB		 1817 /*
1818 * For SIMPLE and UNTAGGED Task Attribute commands
1819 */
5f41a31d 1820 atomic_inc(&dev->simple_cmds);
c66ac9db 1821 smp_mb__after_atomic_inc();
5f41a31d 1822 break;
c66ac9db 1823 }
5f41a31d
CH		 1824
1825 if (atomic_read(&dev->dev_ordered_sync) != 0) {
1826 spin_lock(&dev->delayed_cmd_lock);
5f41a31d
CH		 1827 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1828 spin_unlock(&dev->delayed_cmd_lock);
c66ac9db 1829
6708bb27 1830 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 1831 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 1832 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db 1833 cmd->se_ordered_id);
5f41a31d 1834 return;
c66ac9db 1835 }
c66ac9db 1836
5f41a31d 1837execute:
c66ac9db 1838 /*
5f41a31d 1839 * Otherwise, no ORDERED task attributes exist..
c66ac9db 1840 */
5f41a31d 1841 __target_execute_cmd(cmd);
c66ac9db 1842}
70baf0ab 1843EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1844
5f41a31d
CH		 1845/*
1846 * Process all commands up to the last received ORDERED task attribute which
1847 * requires another blocking boundary
1848 */
1849static void target_restart_delayed_cmds(struct se_device *dev)
1850{
1851 for (;;) {
1852 struct se_cmd *cmd;
1853
1854 spin_lock(&dev->delayed_cmd_lock);
1855 if (list_empty(&dev->delayed_cmd_list)) {
1856 spin_unlock(&dev->delayed_cmd_lock);
1857 break;
1858 }
1859
1860 cmd = list_entry(dev->delayed_cmd_list.next,
1861 struct se_cmd, se_delayed_node);
1862 list_del(&cmd->se_delayed_node);
1863 spin_unlock(&dev->delayed_cmd_lock);
1864
1865 __target_execute_cmd(cmd);
1866
1867 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1868 break;
1869 }
1870}
1871
c66ac9db 1872/*
35e0e757 1873 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1874 * and ordered cmds need to have their tasks added to the execution queue.
1875 */
1876static void transport_complete_task_attr(struct se_cmd *cmd)
1877{
5951146d 1878 struct se_device *dev = cmd->se_dev;
c66ac9db 1879
e66ecd50 1880 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1881 atomic_dec(&dev->simple_cmds);
1882 smp_mb__after_atomic_dec();
1883 dev->dev_cur_ordered_id++;
6708bb27 1884 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1885 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1886 cmd->se_ordered_id);
e66ecd50 1887 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1888 dev->dev_cur_ordered_id++;
6708bb27 1889 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1890 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1891 cmd->se_ordered_id);
e66ecd50 1892 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1893 atomic_dec(&dev->dev_ordered_sync);
1894 smp_mb__after_atomic_dec();
c66ac9db
NB		 1895
1896 dev->dev_cur_ordered_id++;
6708bb27 1897 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1898 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1899 }
c66ac9db 1900
5f41a31d 1901 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1902}
1903
e057f533 1904static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1905{
1906 int ret = 0;
1907
e057f533
CH		 1908 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1909 transport_complete_task_attr(cmd);
1910
1911 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1912 ret = cmd->se_tfo->queue_status(cmd);
1913 if (ret)
1914 goto out;
1915 }
07bde79a
NB		 1916
1917 switch (cmd->data_direction) {
1918 case DMA_FROM_DEVICE:
1919 ret = cmd->se_tfo->queue_data_in(cmd);
1920 break;
1921 case DMA_TO_DEVICE:
ec98f782 1922 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 1923 ret = cmd->se_tfo->queue_data_in(cmd);
1924 if (ret < 0)
e057f533 1925 break;
07bde79a
NB		 1926 }
1927 /* Fall through for DMA_TO_DEVICE */
1928 case DMA_NONE:
1929 ret = cmd->se_tfo->queue_status(cmd);
1930 break;
1931 default:
1932 break;
1933 }
1934
e057f533
CH		 1935out:
1936 if (ret < 0) {
1937 transport_handle_queue_full(cmd, cmd->se_dev);
1938 return;
1939 }
1940 transport_lun_remove_cmd(cmd);
1941 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1942}
1943
1944static void transport_handle_queue_full(
1945 struct se_cmd *cmd,
e057f533 1946 struct se_device *dev)
07bde79a
NB		 1947{
1948 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1949 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1950 atomic_inc(&dev->dev_qf_count);
1951 smp_mb__after_atomic_inc();
1952 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1953
1954 schedule_work(&cmd->se_dev->qf_work_queue);
1955}
1956
35e0e757 1957static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1958{
35e0e757 1959 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1960 int ret;
35e0e757 1961
c66ac9db
NB		 1962 /*
1963 * Check if we need to move delayed/dormant tasks from cmds on the
1964 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1965 * Attribute.
1966 */
5951146d 1967 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 1968 transport_complete_task_attr(cmd);
07bde79a
NB		 1969 /*
1970 * Check to schedule QUEUE_FULL work, or execute an existing
1971 * cmd->transport_qf_callback()
1972 */
1973 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1974 schedule_work(&cmd->se_dev->qf_work_queue);
1975
c66ac9db 1976 /*
d5829eac 1977 * Check if we need to send a sense buffer from
c66ac9db
NB		 1978 * the struct se_cmd in question.
1979 */
1980 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1981 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1982 ret = transport_send_check_condition_and_sense(
1983 cmd, 0, 1);
1984 if (ret == -EAGAIN || ret == -ENOMEM)
1985 goto queue_full;
1986
1987 transport_lun_remove_cmd(cmd);
1988 transport_cmd_check_stop_to_fabric(cmd);
1989 return;
c66ac9db
NB		 1990 }
1991 /*
25985edc 1992 * Check for a callback, used by amongst other things
c66ac9db
NB		 1993 * XDWRITE_READ_10 emulation.
1994 */
1995 if (cmd->transport_complete_callback)
1996 cmd->transport_complete_callback(cmd);
1997
1998 switch (cmd->data_direction) {
1999 case DMA_FROM_DEVICE:
2000 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2001 if (cmd->se_lun->lun_sep) {
2002 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2003 cmd->data_length;
2004 }
2005 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 2006
07bde79a 2007 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2008 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2009 goto queue_full;
c66ac9db
NB		 2010 break;
2011 case DMA_TO_DEVICE:
2012 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2013 if (cmd->se_lun->lun_sep) {
2014 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2015 cmd->data_length;
2016 }
2017 spin_unlock(&cmd->se_lun->lun_sep_lock);
2018 /*
2019 * Check if we need to send READ payload for BIDI-COMMAND
2020 */
ec98f782 2021 if (cmd->t_bidi_data_sg) {
c66ac9db 2022 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2023 if (cmd->se_lun->lun_sep) {
2024 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2025 cmd->data_length;
2026 }
2027 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2028 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2029 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2030 goto queue_full;
c66ac9db
NB		 2031 break;
2032 }
2033 /* Fall through for DMA_TO_DEVICE */
2034 case DMA_NONE:
07bde79a 2035 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2036 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2037 goto queue_full;
c66ac9db
NB		 2038 break;
2039 default:
2040 break;
2041 }
2042
2043 transport_lun_remove_cmd(cmd);
2044 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2045 return;
2046
2047queue_full:
6708bb27 2048 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2049 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2050 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2051 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2052}
2053
6708bb27 2054static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2055{
ec98f782 2056 struct scatterlist *sg;
ec98f782 2057 int count;
c66ac9db 2058
6708bb27
AG		 2059 for_each_sg(sgl, sg, nents, count)
2060 __free_page(sg_page(sg));
c66ac9db 2061
6708bb27
AG		 2062 kfree(sgl);
2063}
c66ac9db 2064
6708bb27
AG		 2065static inline void transport_free_pages(struct se_cmd *cmd)
2066{
2067 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2068 return;
2069
2070 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2071 cmd->t_data_sg = NULL;
2072 cmd->t_data_nents = 0;
c66ac9db 2073
6708bb27 2074 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2075 cmd->t_bidi_data_sg = NULL;
2076 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2077}
2078
e26d99ae
CH		 2079/**
2080 * transport_release_cmd - free a command
2081 * @cmd: command to free
2082 *
2083 * This routine unconditionally frees a command, and reference counting
2084 * or list removal must be done in the caller.
2085 */
2086static void transport_release_cmd(struct se_cmd *cmd)
2087{
2088 BUG_ON(!cmd->se_tfo);
2089
c8e31f26 2090 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2091 core_tmr_release_req(cmd->se_tmr_req);
2092 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2093 kfree(cmd->t_task_cdb);
2094 /*
7481deb4
NB		 2095 * If this cmd has been setup with target_get_sess_cmd(), drop
2096 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2097 */
7481deb4
NB		 2098 if (cmd->check_release != 0) {
2099 target_put_sess_cmd(cmd->se_sess, cmd);
2100 return;
2101 }
e26d99ae
CH		 2102 cmd->se_tfo->release_cmd(cmd);
2103}
2104
d3df7825
CH		 2105/**
2106 * transport_put_cmd - release a reference to a command
2107 * @cmd: command to release
2108 *
2109 * This routine releases our reference to the command and frees it if possible.
2110 */
39c05f32 2111static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 2112{
2113 unsigned long flags;
c66ac9db 2114
a1d8b49a 2115 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 2116 if (atomic_read(&cmd->t_fe_count)) {
2117 if (!atomic_dec_and_test(&cmd->t_fe_count))
2118 goto out_busy;
2119 }
2120
7d680f3b
CH		 2121 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2122 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2123 target_remove_from_state_list(cmd);
c66ac9db 2124 }
a1d8b49a 2125 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2126
c66ac9db 2127 transport_free_pages(cmd);
31afc39c 2128 transport_release_cmd(cmd);
39c05f32 2129 return;
4911e3cc
CH		 2130out_busy:
2131 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2132}
2133
c66ac9db 2134/*
ec98f782
AG		 2135 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2136 * allocating in the core.
c66ac9db
NB		 2137 * @cmd: Associated se_cmd descriptor
2138 * @mem: SGL style memory for TCM WRITE / READ
2139 * @sg_mem_num: Number of SGL elements
2140 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2141 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2142 *
2143 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2144 * of parameters.
2145 */
2146int transport_generic_map_mem_to_cmd(
2147 struct se_cmd *cmd,
5951146d
AG		 2148 struct scatterlist *sgl,
2149 u32 sgl_count,
2150 struct scatterlist *sgl_bidi,
2151 u32 sgl_bidi_count)
c66ac9db 2152{
5951146d 2153 if (!sgl || !sgl_count)
c66ac9db 2154 return 0;
c66ac9db 2155
64f1db38
CH		 2156 /*
2157 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2158 * scatterlists already have been set to follow what the fabric
2159 * passes for the original expected data transfer length.
2160 */
2161 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2162 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2163 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2164 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2165 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2166 return -EINVAL;
2167 }
c66ac9db 2168
64f1db38
CH		 2169 cmd->t_data_sg = sgl;
2170 cmd->t_data_nents = sgl_count;
c66ac9db 2171
64f1db38
CH		 2172 if (sgl_bidi && sgl_bidi_count) {
2173 cmd->t_bidi_data_sg = sgl_bidi;
2174 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db 2175 }
64f1db38 2176 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 2177 return 0;
2178}
2179EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2180
4949314c 2181void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2182{
ec98f782 2183 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2184 struct page **pages;
2185 int i;
05d1c7c0
AG		 2186
2187 /*
ec98f782
AG		 2188 * We need to take into account a possible offset here for fabrics like
2189 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2190 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2191 */
4949314c
AG		 2192 if (!cmd->t_data_nents)
2193 return NULL;
3717ef0c
PB		 2194
2195 BUG_ON(!sg);
2196 if (cmd->t_data_nents == 1)
4949314c
AG		 2197 return kmap(sg_page(sg)) + sg->offset;
2198
2199 /* >1 page. use vmap */
2200 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3717ef0c
PB		 2201 if (!pages) {
2202 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4949314c 2203 return NULL;
3717ef0c 2204 }
4949314c
AG		 2205
2206 /* convert sg[] to pages[] */
2207 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2208 pages[i] = sg_page(sg);
2209 }
2210
2211 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2212 kfree(pages);
3717ef0c
PB		 2213 if (!cmd->t_data_vmap) {
2214 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4949314c 2215 return NULL;
3717ef0c 2216 }
4949314c
AG		 2217
2218 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2219}
4949314c 2220EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2221
4949314c 2222void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2223{
a1edf9cf 2224 if (!cmd->t_data_nents) {
4949314c 2225 return;
a1edf9cf 2226 } else if (cmd->t_data_nents == 1) {
4949314c 2227 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2228 return;
2229 }
4949314c
AG		 2230
2231 vunmap(cmd->t_data_vmap);
2232 cmd->t_data_vmap = NULL;
05d1c7c0 2233}
4949314c 2234EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2235
c66ac9db 2236static int
05d1c7c0 2237transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2238{
ec98f782
AG		 2239 u32 length = cmd->data_length;
2240 unsigned int nents;
2241 struct page *page;
9db9da33 2242 gfp_t zero_flag;
ec98f782 2243 int i = 0;
c66ac9db 2244
ec98f782
AG		 2245 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2246 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2247 if (!cmd->t_data_sg)
2248 return -ENOMEM;
c66ac9db 2249
ec98f782
AG		 2250 cmd->t_data_nents = nents;
2251 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2252
64f1db38 2253 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2254
ec98f782
AG		 2255 while (length) {
2256 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2257 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2258 if (!page)
2259 goto out;
c66ac9db 2260
ec98f782
AG		 2261 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2262 length -= page_len;
2263 i++;
c66ac9db 2264 }
c66ac9db 2265 return 0;
c66ac9db 2266
ec98f782 2267out:
d0e27c88 2268 while (i > 0) {
ec98f782 2269 i--;
d0e27c88 2270 __free_page(sg_page(&cmd->t_data_sg[i]));
c66ac9db 2271 }
ec98f782
AG		 2272 kfree(cmd->t_data_sg);
2273 cmd->t_data_sg = NULL;
2274 return -ENOMEM;
c66ac9db
NB		 2275}
2276
da0f7619 2277/*
b16a35b0
AG		 2278 * Allocate any required resources to execute the command. For writes we
2279 * might not have the payload yet, so notify the fabric via a call to
2280 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2281 */
a1d8b49a 2282int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2283{
c66ac9db
NB		 2284 int ret = 0;
2285
2286 /*
2287 * Determine is the TCM fabric module has already allocated physical
2288 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2289 * beforehand.
c66ac9db 2290 */
ec98f782
AG		 2291 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2292 cmd->data_length) {
05d1c7c0 2293 ret = transport_generic_get_mem(cmd);
c66ac9db 2294 if (ret < 0)
03e98c9e 2295 goto out_fail;
c66ac9db 2296 }
74f4cf29
NB		 2297 /*
2298 * If this command doesn't have any payload and we don't have to call
2299 * into the fabric for data transfers, go ahead and complete it right
2300 * away.
2301 */
306c11b2 2302 if (!cmd->data_length &&
6abbdf38
PB		 2303 cmd->t_task_cdb[0] != REQUEST_SENSE &&
2304 cmd->se_dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
7d680f3b 2305 spin_lock_irq(&cmd->t_state_lock);
410f6702 2306 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 2307 cmd->transport_state |= CMD_T_ACTIVE;
2308 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35 2309
410f6702
RD		 2310 INIT_WORK(&cmd->work, target_complete_ok_work);
2311 queue_work(target_completion_wq, &cmd->work);
2312 return 0;
2313 }
da0f7619 2314
4101f0a8 2315 atomic_inc(&cmd->t_fe_count);
4101f0a8 2316
c66ac9db 2317 /*
c3196f0c
CH		 2318 * If this command is not a write we can execute it right here,
2319 * for write buffers we need to notify the fabric driver first
2320 * and let it call back once the write buffers are ready.
c66ac9db 2321 */
5f41a31d 2322 target_add_to_state_list(cmd);
c3196f0c
CH		 2323 if (cmd->data_direction != DMA_TO_DEVICE) {
2324 target_execute_cmd(cmd);
2325 return 0;
2326 }
2327
2328 spin_lock_irq(&cmd->t_state_lock);
2329 cmd->t_state = TRANSPORT_WRITE_PENDING;
2330 spin_unlock_irq(&cmd->t_state_lock);
2331
2332 transport_cmd_check_stop(cmd, false);
2333
2334 ret = cmd->se_tfo->write_pending(cmd);
2335 if (ret == -EAGAIN || ret == -ENOMEM)
2336 goto queue_full;
2337
2338 if (ret < 0)
2339 return ret;
2340 return 1;
da0f7619
CH		 2341
2342out_fail:
2343 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2344 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2345 return -EINVAL;
c3196f0c
CH		 2346queue_full:
2347 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2348 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2349 transport_handle_queue_full(cmd, cmd->se_dev);
2350 return 0;
c66ac9db 2351}
a1d8b49a 2352EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2353
e057f533 2354static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2355{
f147abb4
NB		 2356 int ret;
2357
2358 ret = cmd->se_tfo->write_pending(cmd);
2359 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2360 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2361 cmd);
2362 transport_handle_queue_full(cmd, cmd->se_dev);
2363 }
07bde79a
NB		 2364}
2365
39c05f32 2366void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2367{
d14921d6 2368 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2369 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2370 transport_wait_for_tasks(cmd);
2371
35462975 2372 transport_release_cmd(cmd);
d14921d6
NB		 2373 } else {
2374 if (wait_for_tasks)
2375 transport_wait_for_tasks(cmd);
2376
c66ac9db
NB		 2377 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2378
82f1c8a4 2379 if (cmd->se_lun)
c66ac9db 2380 transport_lun_remove_cmd(cmd);
c66ac9db 2381
39c05f32 2382 transport_put_cmd(cmd);
c66ac9db
NB		 2383 }
2384}
2385EXPORT_SYMBOL(transport_generic_free_cmd);
2386
a17f091d
NB		 2387/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2388 * @se_sess: session to reference
2389 * @se_cmd: command descriptor to add
a6360785 2390 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2391 */
bc187ea6
RD		 2392static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2393 bool ack_kref)
a17f091d
NB		 2394{
2395 unsigned long flags;
bc187ea6 2396 int ret = 0;
a17f091d 2397
7481deb4 2398 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2399 /*
2400 * Add a second kref if the fabric caller is expecting to handle
2401 * fabric acknowledgement that requires two target_put_sess_cmd()
2402 * invocations before se_cmd descriptor release.
2403 */
86715569 2404 if (ack_kref == true) {
a6360785 2405 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2406 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2407 }
7481deb4 2408
a17f091d 2409 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2410 if (se_sess->sess_tearing_down) {
2411 ret = -ESHUTDOWN;
2412 goto out;
2413 }
a17f091d
NB		 2414 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2415 se_cmd->check_release = 1;
bc187ea6
RD		 2416
2417out:
a17f091d 2418 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2419 return ret;
a17f091d 2420}
a17f091d 2421
7481deb4 2422static void target_release_cmd_kref(struct kref *kref)
a17f091d 2423{
7481deb4
NB		 2424 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2425 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 2426 unsigned long flags;
2427
2428 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2429 if (list_empty(&se_cmd->se_cmd_list)) {
2430 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2431 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2432 return;
a17f091d 2433 }
a17f091d
NB		 2434 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2435 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2436 complete(&se_cmd->cmd_wait_comp);
7481deb4 2437 return;
a17f091d
NB		 2438 }
2439 list_del(&se_cmd->se_cmd_list);
2440 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2441
7481deb4
NB		 2442 se_cmd->se_tfo->release_cmd(se_cmd);
2443}
2444
2445/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2446 * @se_sess: session to reference
2447 * @se_cmd: command descriptor to drop
2448 */
2449int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2450{
2451 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2452}
2453EXPORT_SYMBOL(target_put_sess_cmd);
2454
1c7b13fe
RD		 2455/* target_sess_cmd_list_set_waiting - Flag all commands in
2456 * sess_cmd_list to complete cmd_wait_comp. Set
2457 * sess_tearing_down so no more commands are queued.
2458 * @se_sess: session to flag
a17f091d 2459 */
1c7b13fe 2460void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2461{
2462 struct se_cmd *se_cmd;
2463 unsigned long flags;
2464
a17f091d 2465 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
a17f091d 2466
1c7b13fe
RD		 2467 WARN_ON(se_sess->sess_tearing_down);
2468 se_sess->sess_tearing_down = 1;
a17f091d 2469
1c7b13fe 2470 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
a17f091d
NB		 2471 se_cmd->cmd_wait_set = 1;
2472
2473 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2474}
1c7b13fe 2475EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2476
2477/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2478 * @se_sess: session to wait for active I/O
2479 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2480 */
2481void target_wait_for_sess_cmds(
2482 struct se_session *se_sess,
2483 int wait_for_tasks)
2484{
2485 struct se_cmd *se_cmd, *tmp_cmd;
2486 bool rc = false;
2487
2488 list_for_each_entry_safe(se_cmd, tmp_cmd,
1c7b13fe 2489 &se_sess->sess_cmd_list, se_cmd_list) {
a17f091d
NB		 2490 list_del(&se_cmd->se_cmd_list);
2491
2492 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2493 " %d\n", se_cmd, se_cmd->t_state,
2494 se_cmd->se_tfo->get_cmd_state(se_cmd));
2495
2496 if (wait_for_tasks) {
2497 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2498 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2499 se_cmd->se_tfo->get_cmd_state(se_cmd));
2500
2501 rc = transport_wait_for_tasks(se_cmd);
2502
2503 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2504 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2505 se_cmd->se_tfo->get_cmd_state(se_cmd));
2506 }
2507
2508 if (!rc) {
2509 wait_for_completion(&se_cmd->cmd_wait_comp);
2510 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2511 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2512 se_cmd->se_tfo->get_cmd_state(se_cmd));
2513 }
2514
2515 se_cmd->se_tfo->release_cmd(se_cmd);
2516 }
2517}
2518EXPORT_SYMBOL(target_wait_for_sess_cmds);
2519
c66ac9db
NB		 2520/* transport_lun_wait_for_tasks():
2521 *
2522 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2523 * an struct se_lun to be successfully shutdown.
2524 */
2525static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2526{
2527 unsigned long flags;
cf572a96
CH		 2528 int ret = 0;
2529
c66ac9db
NB		 2530 /*
2531 * If the frontend has already requested this struct se_cmd to
2532 * be stopped, we can safely ignore this struct se_cmd.
2533 */
a1d8b49a 2534 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2535 if (cmd->transport_state & CMD_T_STOP) {
2536 cmd->transport_state &= ~CMD_T_LUN_STOP;
2537
2538 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2539 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2540 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2541 transport_cmd_check_stop(cmd, false);
e3d6f909 2542 return -EPERM;
c66ac9db 2543 }
7d680f3b 2544 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2545 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2546
cf572a96
CH		 2547 // XXX: audit task_flags checks.
2548 spin_lock_irqsave(&cmd->t_state_lock, flags);
2549 if ((cmd->transport_state & CMD_T_BUSY) &&
2550 (cmd->transport_state & CMD_T_SENT)) {
2551 if (!target_stop_cmd(cmd, &flags))
2552 ret++;
cf572a96 2553 }
5f41a31d 2554 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2555
785fdf70
CH		 2556 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2557 " %d\n", cmd, ret);
c66ac9db 2558 if (!ret) {
6708bb27 2559 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2560 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2561 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2562 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2563 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2564 }
c66ac9db
NB		 2565
2566 return 0;
2567}
2568
c66ac9db
NB		 2569static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2570{
2571 struct se_cmd *cmd = NULL;
2572 unsigned long lun_flags, cmd_flags;
2573 /*
2574 * Do exception processing and return CHECK_CONDITION status to the
2575 * Initiator Port.
2576 */
2577 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2578 while (!list_empty(&lun->lun_cmd_list)) {
2579 cmd = list_first_entry(&lun->lun_cmd_list,
2580 struct se_cmd, se_lun_node);
3d26fea0 2581 list_del_init(&cmd->se_lun_node);
5951146d 2582
a1d8b49a 2583 spin_lock(&cmd->t_state_lock);
6708bb27 2584 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2585 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2586 cmd->se_lun->unpacked_lun,
2587 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2588 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2589 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2590
2591 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2592
6708bb27
AG		 2593 if (!cmd->se_lun) {
2594 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2595 cmd->se_tfo->get_task_tag(cmd),
2596 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2597 BUG();
2598 }
2599 /*
2600 * If the Storage engine still owns the iscsi_cmd_t, determine
2601 * and/or stop its context.
2602 */
6708bb27 2603 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2604 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2605 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2606
e3d6f909 2607 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2608 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2609 continue;
2610 }
2611
6708bb27 2612 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2613 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2614 cmd->se_lun->unpacked_lun,
2615 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2616
a1d8b49a 2617 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2618 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2619 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2620 goto check_cond;
2621 }
7d680f3b 2622 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2623 target_remove_from_state_list(cmd);
a1d8b49a 2624 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2625
c66ac9db
NB		 2626 /*
2627 * The Storage engine stopped this struct se_cmd before it was
2628 * send to the fabric frontend for delivery back to the
2629 * Initiator Node. Return this SCSI CDB back with an
2630 * CHECK_CONDITION status.
2631 */
2632check_cond:
2633 transport_send_check_condition_and_sense(cmd,
2634 TCM_NON_EXISTENT_LUN, 0);
2635 /*
2636 * If the fabric frontend is waiting for this iscsi_cmd_t to
2637 * be released, notify the waiting thread now that LU has
2638 * finished accessing it.
2639 */
a1d8b49a 2640 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2641 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2642 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2643 " struct se_cmd: %p ITT: 0x%08x\n",
2644 lun->unpacked_lun,
e3d6f909 2645 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2646
a1d8b49a 2647 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2648 cmd_flags);
f7113a47 2649 transport_cmd_check_stop(cmd, false);
a1d8b49a 2650 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2651 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2652 continue;
2653 }
6708bb27 2654 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2655 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2656
a1d8b49a 2657 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2658 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2659 }
2660 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2661}
2662
2663static int transport_clear_lun_thread(void *p)
2664{
8359cf43 2665 struct se_lun *lun = p;
c66ac9db
NB		 2666
2667 __transport_clear_lun_from_sessions(lun);
2668 complete(&lun->lun_shutdown_comp);
2669
2670 return 0;
2671}
2672
2673int transport_clear_lun_from_sessions(struct se_lun *lun)
2674{
2675 struct task_struct *kt;
2676
5951146d 2677 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2678 "tcm_cl_%u", lun->unpacked_lun);
2679 if (IS_ERR(kt)) {
6708bb27 2680 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2681 return PTR_ERR(kt);
c66ac9db
NB		 2682 }
2683 wait_for_completion(&lun->lun_shutdown_comp);
2684
2685 return 0;
2686}
2687
d14921d6
NB		 2688/**
2689 * transport_wait_for_tasks - wait for completion to occur
2690 * @cmd: command to wait
c66ac9db 2691 *
d14921d6
NB		 2692 * Called from frontend fabric context to wait for storage engine
2693 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2694 */
a17f091d 2695bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2696{
2697 unsigned long flags;
2698
a1d8b49a 2699 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2700 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2701 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2702 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2703 return false;
d14921d6 2704 }
cb4f4d3c 2705
c8e31f26
AG		 2706 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2707 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2708 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2709 return false;
d14921d6 2710 }
c66ac9db
NB		 2711 /*
2712 * If we are already stopped due to an external event (ie: LUN shutdown)
2713 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2714 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2715 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2716 * has completed its operation on the struct se_cmd.
2717 */
7d680f3b 2718 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2719 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2720 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2721 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2722 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2723 /*
2724 * There is a special case for WRITES where a FE exception +
2725 * LUN shutdown means ConfigFS context is still sleeping on
2726 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2727 * We go ahead and up transport_lun_stop_comp just to be sure
2728 * here.
2729 */
a1d8b49a
AG		 2730 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2731 complete(&cmd->transport_lun_stop_comp);
2732 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2733 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2734
cf572a96 2735 target_remove_from_state_list(cmd);
c66ac9db
NB		 2736 /*
2737 * At this point, the frontend who was the originator of this
2738 * struct se_cmd, now owns the structure and can be released through
2739 * normal means below.
2740 */
6708bb27 2741 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2742 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2743 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2744 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2745
7d680f3b 2746 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2747 }
7d680f3b 2748
3d28934a 2749 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2750 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2751 return false;
d14921d6 2752 }
c66ac9db 2753
7d680f3b 2754 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2755
6708bb27 2756 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2757 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2758 cmd, cmd->se_tfo->get_task_tag(cmd),
2759 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2760
a1d8b49a 2761 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2762
a1d8b49a 2763 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2764
a1d8b49a 2765 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2766 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2767
6708bb27 2768 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 2769 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2770 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2771
d14921d6 2772 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2773
2774 return true;
c66ac9db 2775}
d14921d6 2776EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2777
2778static int transport_get_sense_codes(
2779 struct se_cmd *cmd,
2780 u8 *asc,
2781 u8 *ascq)
2782{
2783 *asc = cmd->scsi_asc;
2784 *ascq = cmd->scsi_ascq;
2785
2786 return 0;
2787}
2788
2789static int transport_set_sense_codes(
2790 struct se_cmd *cmd,
2791 u8 asc,
2792 u8 ascq)
2793{
2794 cmd->scsi_asc = asc;
2795 cmd->scsi_ascq = ascq;
2796
2797 return 0;
2798}
2799
2800int transport_send_check_condition_and_sense(
2801 struct se_cmd *cmd,
2802 u8 reason,
2803 int from_transport)
2804{
2805 unsigned char *buffer = cmd->sense_buffer;
2806 unsigned long flags;
2807 int offset;
2808 u8 asc = 0, ascq = 0;
2809
a1d8b49a 2810 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2811 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2812 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2813 return 0;
2814 }
2815 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2816 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2817
2818 if (!reason && from_transport)
2819 goto after_reason;
2820
2821 if (!from_transport)
2822 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2823 /*
2824 * Data Segment and SenseLength of the fabric response PDU.
2825 *
2826 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2827 * from include/scsi/scsi_cmnd.h
2828 */
e3d6f909 2829 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2830 TRANSPORT_SENSE_BUFFER);
2831 /*
2832 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2833 * SENSE KEY values from include/scsi/scsi.h
2834 */
2835 switch (reason) {
2836 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 2837 /* CURRENT ERROR */
2838 buffer[offset] = 0x70;
895f3022 2839 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 2840 /* ILLEGAL REQUEST */
2841 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2842 /* LOGICAL UNIT NOT SUPPORTED */
2843 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
2844 break;
c66ac9db
NB		 2845 case TCM_UNSUPPORTED_SCSI_OPCODE:
2846 case TCM_SECTOR_COUNT_TOO_MANY:
2847 /* CURRENT ERROR */
2848 buffer[offset] = 0x70;
895f3022 2849 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2850 /* ILLEGAL REQUEST */
2851 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2852 /* INVALID COMMAND OPERATION CODE */
2853 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
2854 break;
2855 case TCM_UNKNOWN_MODE_PAGE:
2856 /* CURRENT ERROR */
2857 buffer[offset] = 0x70;
895f3022 2858 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2859 /* ILLEGAL REQUEST */
2860 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2861 /* INVALID FIELD IN CDB */
2862 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2863 break;
2864 case TCM_CHECK_CONDITION_ABORT_CMD:
2865 /* CURRENT ERROR */
2866 buffer[offset] = 0x70;
895f3022 2867 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2868 /* ABORTED COMMAND */
2869 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2870 /* BUS DEVICE RESET FUNCTION OCCURRED */
2871 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
2872 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
2873 break;
2874 case TCM_INCORRECT_AMOUNT_OF_DATA:
2875 /* CURRENT ERROR */
2876 buffer[offset] = 0x70;
895f3022 2877 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2878 /* ABORTED COMMAND */
2879 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2880 /* WRITE ERROR */
2881 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2882 /* NOT ENOUGH UNSOLICITED DATA */
2883 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
2884 break;
2885 case TCM_INVALID_CDB_FIELD:
2886 /* CURRENT ERROR */
2887 buffer[offset] = 0x70;
895f3022 2888 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 2889 /* ILLEGAL REQUEST */
2890 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 2891 /* INVALID FIELD IN CDB */
2892 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2893 break;
2894 case TCM_INVALID_PARAMETER_LIST:
2895 /* CURRENT ERROR */
2896 buffer[offset] = 0x70;
895f3022 2897 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 2898 /* ILLEGAL REQUEST */
2899 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 2900 /* INVALID FIELD IN PARAMETER LIST */
2901 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
2902 break;
2903 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2904 /* CURRENT ERROR */
2905 buffer[offset] = 0x70;
895f3022 2906 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2907 /* ABORTED COMMAND */
2908 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2909 /* WRITE ERROR */
2910 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2911 /* UNEXPECTED_UNSOLICITED_DATA */
2912 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
2913 break;
2914 case TCM_SERVICE_CRC_ERROR:
2915 /* CURRENT ERROR */
2916 buffer[offset] = 0x70;
895f3022 2917 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2918 /* ABORTED COMMAND */
2919 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2920 /* PROTOCOL SERVICE CRC ERROR */
2921 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
2922 /* N/A */
2923 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
2924 break;
2925 case TCM_SNACK_REJECTED:
2926 /* CURRENT ERROR */
2927 buffer[offset] = 0x70;
895f3022 2928 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2929 /* ABORTED COMMAND */
2930 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2931 /* READ ERROR */
2932 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
2933 /* FAILED RETRANSMISSION REQUEST */
2934 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
2935 break;
2936 case TCM_WRITE_PROTECTED:
2937 /* CURRENT ERROR */
2938 buffer[offset] = 0x70;
895f3022 2939 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2940 /* DATA PROTECT */
2941 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2942 /* WRITE PROTECTED */
2943 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
2944 break;
e2397c70
RD		 2945 case TCM_ADDRESS_OUT_OF_RANGE:
2946 /* CURRENT ERROR */
2947 buffer[offset] = 0x70;
2948 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2949 /* ILLEGAL REQUEST */
2950 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2951 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2952 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21;
2953 break;
c66ac9db
NB		 2954 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2955 /* CURRENT ERROR */
2956 buffer[offset] = 0x70;
895f3022 2957 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2958 /* UNIT ATTENTION */
2959 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2960 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2961 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2962 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2963 break;
2964 case TCM_CHECK_CONDITION_NOT_READY:
2965 /* CURRENT ERROR */
2966 buffer[offset] = 0x70;
895f3022 2967 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2968 /* Not Ready */
2969 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
2970 transport_get_sense_codes(cmd, &asc, &ascq);
2971 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2972 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2973 break;
2974 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2975 default:
2976 /* CURRENT ERROR */
2977 buffer[offset] = 0x70;
895f3022 2978 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2979 /* ILLEGAL REQUEST */
2980 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2981 /* LOGICAL UNIT COMMUNICATION FAILURE */
2982 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
2983 break;
2984 }
2985 /*
2986 * This code uses linux/include/scsi/scsi.h SAM status codes!
2987 */
2988 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2989 /*
2990 * Automatically padded, this value is encoded in the fabric's
2991 * data_length response PDU containing the SCSI defined sense data.
2992 */
2993 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
2994
2995after_reason:
07bde79a 2996 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2997}
2998EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2999
3000int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3001{
3002 int ret = 0;
3003
7d680f3b 3004 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 3005 if (!send_status ||
c66ac9db
NB		 3006 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3007 return 1;
8b1e1244 3008
6708bb27 3009 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 3010 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 3011 cmd->t_task_cdb[0],
e3d6f909 3012 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3013
c66ac9db 3014 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 3015 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3016 ret = 1;
3017 }
3018 return ret;
3019}
3020EXPORT_SYMBOL(transport_check_aborted_status);
3021
3022void transport_send_task_abort(struct se_cmd *cmd)
3023{
c252f003
NB		 3024 unsigned long flags;
3025
3026 spin_lock_irqsave(&cmd->t_state_lock, flags);
3027 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3028 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3029 return;
3030 }
3031 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3032
c66ac9db
NB		 3033 /*
3034 * If there are still expected incoming fabric WRITEs, we wait
3035 * until until they have completed before sending a TASK_ABORTED
3036 * response. This response with TASK_ABORTED status will be
3037 * queued back to fabric module by transport_check_aborted_status().
3038 */
3039 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3040 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 3041 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 3042 smp_mb__after_atomic_inc();
c66ac9db
NB		 3043 }
3044 }
3045 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3046
6708bb27 3047 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 3048 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 3049 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3050
e3d6f909 3051 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3052}
3053
af877292 3054static void target_tmr_work(struct work_struct *work)
c66ac9db 3055{
af877292 3056 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3057 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3058 struct se_tmr_req *tmr = cmd->se_tmr_req;
3059 int ret;
3060
3061 switch (tmr->function) {
5c6cd613 3062 case TMR_ABORT_TASK:
3d28934a 3063 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3064 break;
5c6cd613
NB		 3065 case TMR_ABORT_TASK_SET:
3066 case TMR_CLEAR_ACA:
3067 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3068 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3069 break;
5c6cd613 3070 case TMR_LUN_RESET:
c66ac9db
NB		 3071 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3072 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3073 TMR_FUNCTION_REJECTED;
3074 break;
5c6cd613 3075 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3076 tmr->response = TMR_FUNCTION_REJECTED;
3077 break;
5c6cd613 3078 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3079 tmr->response = TMR_FUNCTION_REJECTED;
3080 break;
c66ac9db 3081 default:
6708bb27 3082 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3083 tmr->function);
3084 tmr->response = TMR_FUNCTION_REJECTED;
3085 break;
3086 }
3087
3088 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 3089 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3090
b7b8bef7 3091 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3092}
3093
af877292
CH		 3094int transport_generic_handle_tmr(
3095 struct se_cmd *cmd)
c66ac9db 3096{
af877292
CH		 3097 INIT_WORK(&cmd->work, target_tmr_work);
3098 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3099 return 0;
3100}
af877292 3101EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux kernel - Deliverables
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