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target: always allocate a single task
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
015487b8 40#include <linux/ratelimit.h>
c66ac9db
NB		 41#include <asm/unaligned.h>
42#include <net/sock.h>
43#include <net/tcp.h>
44#include <scsi/scsi.h>
45#include <scsi/scsi_cmnd.h>
e66ecd50 46#include <scsi/scsi_tcq.h>
c66ac9db
NB		 47
48#include <target/target_core_base.h>
c4795fb2
CH		 49#include <target/target_core_backend.h>
50#include <target/target_core_fabric.h>
c66ac9db
NB		 51#include <target/target_core_configfs.h>
52
e26d99ae 53#include "target_core_internal.h"
c66ac9db 54#include "target_core_alua.h"
c66ac9db 55#include "target_core_pr.h"
c66ac9db
NB		 56#include "target_core_ua.h"
57
e3d6f909 58static int sub_api_initialized;
c66ac9db 59
35e0e757 60static struct workqueue_struct *target_completion_wq;
c66ac9db 61static struct kmem_cache *se_sess_cache;
c66ac9db 62struct kmem_cache *se_ua_cache;
c66ac9db
NB		 63struct kmem_cache *t10_pr_reg_cache;
64struct kmem_cache *t10_alua_lu_gp_cache;
65struct kmem_cache *t10_alua_lu_gp_mem_cache;
66struct kmem_cache *t10_alua_tg_pt_gp_cache;
67struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
68
c66ac9db 69static int transport_generic_write_pending(struct se_cmd *);
5951146d 70static int transport_processing_thread(void *param);
4d2300cc 71static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
c66ac9db 72static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 73static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 74 struct se_device *dev);
c66ac9db 75static void transport_free_dev_tasks(struct se_cmd *cmd);
05d1c7c0 76static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 77static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 78static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 79static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
35e0e757 80static void target_complete_ok_work(struct work_struct *work);
c66ac9db 81
e3d6f909 82int init_se_kmem_caches(void)
c66ac9db 83{
c66ac9db
NB		 84 se_sess_cache = kmem_cache_create("se_sess_cache",
85 sizeof(struct se_session), __alignof__(struct se_session),
86 0, NULL);
6708bb27
AG		 87 if (!se_sess_cache) {
88 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 89 " failed\n");
c8e31f26 90 goto out;
c66ac9db
NB		 91 }
92 se_ua_cache = kmem_cache_create("se_ua_cache",
93 sizeof(struct se_ua), __alignof__(struct se_ua),
94 0, NULL);
6708bb27
AG		 95 if (!se_ua_cache) {
96 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 97 goto out_free_sess_cache;
c66ac9db 98 }
c66ac9db
NB		 99 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
100 sizeof(struct t10_pr_registration),
101 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 102 if (!t10_pr_reg_cache) {
103 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 104 " failed\n");
35e0e757 105 goto out_free_ua_cache;
c66ac9db
NB		 106 }
107 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
108 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
109 0, NULL);
6708bb27
AG		 110 if (!t10_alua_lu_gp_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 112 " failed\n");
35e0e757 113 goto out_free_pr_reg_cache;
c66ac9db
NB		 114 }
115 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
116 sizeof(struct t10_alua_lu_gp_member),
117 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 118 if (!t10_alua_lu_gp_mem_cache) {
119 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 120 "cache failed\n");
35e0e757 121 goto out_free_lu_gp_cache;
c66ac9db
NB		 122 }
123 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
124 sizeof(struct t10_alua_tg_pt_gp),
125 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 126 if (!t10_alua_tg_pt_gp_cache) {
127 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 128 "cache failed\n");
35e0e757 129 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 130 }
131 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
132 "t10_alua_tg_pt_gp_mem_cache",
133 sizeof(struct t10_alua_tg_pt_gp_member),
134 __alignof__(struct t10_alua_tg_pt_gp_member),
135 0, NULL);
6708bb27
AG		 136 if (!t10_alua_tg_pt_gp_mem_cache) {
137 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 138 "mem_t failed\n");
35e0e757 139 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 140 }
141
35e0e757
CH		 142 target_completion_wq = alloc_workqueue("target_completion",
143 WQ_MEM_RECLAIM, 0);
144 if (!target_completion_wq)
145 goto out_free_tg_pt_gp_mem_cache;
146
c66ac9db 147 return 0;
35e0e757
CH		 148
149out_free_tg_pt_gp_mem_cache:
150 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
151out_free_tg_pt_gp_cache:
152 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
153out_free_lu_gp_mem_cache:
154 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
155out_free_lu_gp_cache:
156 kmem_cache_destroy(t10_alua_lu_gp_cache);
157out_free_pr_reg_cache:
158 kmem_cache_destroy(t10_pr_reg_cache);
159out_free_ua_cache:
160 kmem_cache_destroy(se_ua_cache);
161out_free_sess_cache:
162 kmem_cache_destroy(se_sess_cache);
c66ac9db 163out:
e3d6f909 164 return -ENOMEM;
c66ac9db
NB		 165}
166
e3d6f909 167void release_se_kmem_caches(void)
c66ac9db 168{
35e0e757 169 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 170 kmem_cache_destroy(se_sess_cache);
171 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 172 kmem_cache_destroy(t10_pr_reg_cache);
173 kmem_cache_destroy(t10_alua_lu_gp_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
176 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 177}
178
e3d6f909
AG		 179/* This code ensures unique mib indexes are handed out. */
180static DEFINE_SPINLOCK(scsi_mib_index_lock);
181static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 182
183/*
184 * Allocate a new row index for the entry type specified
185 */
186u32 scsi_get_new_index(scsi_index_t type)
187{
188 u32 new_index;
189
e3d6f909 190 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 191
e3d6f909
AG		 192 spin_lock(&scsi_mib_index_lock);
193 new_index = ++scsi_mib_index[type];
194 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 195
196 return new_index;
197}
198
e26d99ae 199static void transport_init_queue_obj(struct se_queue_obj *qobj)
c66ac9db
NB		 200{
201 atomic_set(&qobj->queue_cnt, 0);
202 INIT_LIST_HEAD(&qobj->qobj_list);
203 init_waitqueue_head(&qobj->thread_wq);
204 spin_lock_init(&qobj->cmd_queue_lock);
205}
c66ac9db 206
dbc5623e 207void transport_subsystem_check_init(void)
c66ac9db
NB		 208{
209 int ret;
210
dbc5623e
NB		 211 if (sub_api_initialized)
212 return;
213
c66ac9db
NB		 214 ret = request_module("target_core_iblock");
215 if (ret != 0)
6708bb27 216 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 217
218 ret = request_module("target_core_file");
219 if (ret != 0)
6708bb27 220 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 221
222 ret = request_module("target_core_pscsi");
223 if (ret != 0)
6708bb27 224 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 225
226 ret = request_module("target_core_stgt");
227 if (ret != 0)
6708bb27 228 pr_err("Unable to load target_core_stgt\n");
c66ac9db 229
e3d6f909 230 sub_api_initialized = 1;
dbc5623e 231 return;
c66ac9db
NB		 232}
233
234struct se_session *transport_init_session(void)
235{
236 struct se_session *se_sess;
237
238 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 239 if (!se_sess) {
240 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 241 " se_sess_cache\n");
242 return ERR_PTR(-ENOMEM);
243 }
244 INIT_LIST_HEAD(&se_sess->sess_list);
245 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d
NB		 246 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
247 INIT_LIST_HEAD(&se_sess->sess_wait_list);
248 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 249 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 250
251 return se_sess;
252}
253EXPORT_SYMBOL(transport_init_session);
254
255/*
140854cb 256 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 257 */
258void __transport_register_session(
259 struct se_portal_group *se_tpg,
260 struct se_node_acl *se_nacl,
261 struct se_session *se_sess,
262 void *fabric_sess_ptr)
263{
264 unsigned char buf[PR_REG_ISID_LEN];
265
266 se_sess->se_tpg = se_tpg;
267 se_sess->fabric_sess_ptr = fabric_sess_ptr;
268 /*
269 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
270 *
271 * Only set for struct se_session's that will actually be moving I/O.
272 * eg: *NOT* discovery sessions.
273 */
274 if (se_nacl) {
275 /*
276 * If the fabric module supports an ISID based TransportID,
277 * save this value in binary from the fabric I_T Nexus now.
278 */
e3d6f909 279 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 280 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 281 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 282 &buf[0], PR_REG_ISID_LEN);
283 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
284 }
afb999ff
NB		 285 kref_get(&se_nacl->acl_kref);
286
c66ac9db
NB		 287 spin_lock_irq(&se_nacl->nacl_sess_lock);
288 /*
289 * The se_nacl->nacl_sess pointer will be set to the
290 * last active I_T Nexus for each struct se_node_acl.
291 */
292 se_nacl->nacl_sess = se_sess;
293
294 list_add_tail(&se_sess->sess_acl_list,
295 &se_nacl->acl_sess_list);
296 spin_unlock_irq(&se_nacl->nacl_sess_lock);
297 }
298 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
299
6708bb27 300 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 301 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 302}
303EXPORT_SYMBOL(__transport_register_session);
304
305void transport_register_session(
306 struct se_portal_group *se_tpg,
307 struct se_node_acl *se_nacl,
308 struct se_session *se_sess,
309 void *fabric_sess_ptr)
310{
140854cb
NB		 311 unsigned long flags;
312
313 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 314 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 315 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 316}
317EXPORT_SYMBOL(transport_register_session);
318
41ac82b6
NB		 319static void target_release_session(struct kref *kref)
320{
321 struct se_session *se_sess = container_of(kref,
322 struct se_session, sess_kref);
323 struct se_portal_group *se_tpg = se_sess->se_tpg;
324
325 se_tpg->se_tpg_tfo->close_session(se_sess);
326}
327
328void target_get_session(struct se_session *se_sess)
329{
330 kref_get(&se_sess->sess_kref);
331}
332EXPORT_SYMBOL(target_get_session);
333
334int target_put_session(struct se_session *se_sess)
335{
336 return kref_put(&se_sess->sess_kref, target_release_session);
337}
338EXPORT_SYMBOL(target_put_session);
339
afb999ff
NB		 340static void target_complete_nacl(struct kref *kref)
341{
342 struct se_node_acl *nacl = container_of(kref,
343 struct se_node_acl, acl_kref);
344
345 complete(&nacl->acl_free_comp);
346}
347
348void target_put_nacl(struct se_node_acl *nacl)
349{
350 kref_put(&nacl->acl_kref, target_complete_nacl);
351}
352
c66ac9db
NB		 353void transport_deregister_session_configfs(struct se_session *se_sess)
354{
355 struct se_node_acl *se_nacl;
23388864 356 unsigned long flags;
c66ac9db
NB		 357 /*
358 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
359 */
360 se_nacl = se_sess->se_node_acl;
6708bb27 361 if (se_nacl) {
23388864 362 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 363 if (se_nacl->acl_stop == 0)
364 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 365 /*
366 * If the session list is empty, then clear the pointer.
367 * Otherwise, set the struct se_session pointer from the tail
368 * element of the per struct se_node_acl active session list.
369 */
370 if (list_empty(&se_nacl->acl_sess_list))
371 se_nacl->nacl_sess = NULL;
372 else {
373 se_nacl->nacl_sess = container_of(
374 se_nacl->acl_sess_list.prev,
375 struct se_session, sess_acl_list);
376 }
23388864 377 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 378 }
379}
380EXPORT_SYMBOL(transport_deregister_session_configfs);
381
382void transport_free_session(struct se_session *se_sess)
383{
384 kmem_cache_free(se_sess_cache, se_sess);
385}
386EXPORT_SYMBOL(transport_free_session);
387
388void transport_deregister_session(struct se_session *se_sess)
389{
390 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 391 struct target_core_fabric_ops *se_tfo;
c66ac9db 392 struct se_node_acl *se_nacl;
e63a8e19 393 unsigned long flags;
01468346 394 bool comp_nacl = true;
c66ac9db 395
6708bb27 396 if (!se_tpg) {
c66ac9db
NB		 397 transport_free_session(se_sess);
398 return;
399 }
01468346 400 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 401
e63a8e19 402 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 403 list_del(&se_sess->sess_list);
404 se_sess->se_tpg = NULL;
405 se_sess->fabric_sess_ptr = NULL;
e63a8e19 406 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 407
408 /*
409 * Determine if we need to do extra work for this initiator node's
410 * struct se_node_acl if it had been previously dynamically generated.
411 */
412 se_nacl = se_sess->se_node_acl;
01468346
NB		 413
414 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
415 if (se_nacl && se_nacl->dynamic_node_acl) {
416 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
417 list_del(&se_nacl->acl_list);
418 se_tpg->num_node_acls--;
419 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
420 core_tpg_wait_for_nacl_pr_ref(se_nacl);
421 core_free_device_list_for_node(se_nacl, se_tpg);
422 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
423
424 comp_nacl = false;
425 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 426 }
c66ac9db 427 }
01468346 428 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 429
6708bb27 430 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 431 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 432 /*
afb999ff
NB		 433 * If last kref is dropping now for an explict NodeACL, awake sleeping
434 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
435 * removal context.
01468346
NB		 436 */
437 if (se_nacl && comp_nacl == true)
afb999ff 438 target_put_nacl(se_nacl);
01468346 439
afb999ff 440 transport_free_session(se_sess);
c66ac9db
NB		 441}
442EXPORT_SYMBOL(transport_deregister_session);
443
444/*
a1d8b49a 445 * Called with cmd->t_state_lock held.
c66ac9db
NB		 446 */
447static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
448{
42bf829e 449 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 450 struct se_task *task;
451 unsigned long flags;
452
42bf829e
CH		 453 if (!dev)
454 return;
c66ac9db 455
42bf829e 456 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 457 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 458 continue;
459
c66ac9db 460 spin_lock_irqsave(&dev->execute_task_lock, flags);
1880807a
CH		 461 if (task->t_state_active) {
462 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
463 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db 464
1880807a
CH		 465 list_del(&task->t_state_list);
466 atomic_dec(&cmd->t_task_cdbs_ex_left);
467 task->t_state_active = false;
468 }
469 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db 470 }
1880807a 471
c66ac9db
NB		 472}
473
474/* transport_cmd_check_stop():
475 *
7d680f3b 476 * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
c66ac9db
NB		 477 * 'transport_off = 2' determines if task_dev_state should be removed.
478 *
479 * A non-zero u8 t_state sets cmd->t_state.
480 * Returns 1 when command is stopped, else 0.
481 */
482static int transport_cmd_check_stop(
483 struct se_cmd *cmd,
484 int transport_off,
485 u8 t_state)
486{
487 unsigned long flags;
488
a1d8b49a 489 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 490 /*
491 * Determine if IOCTL context caller in requesting the stopping of this
492 * command for LUN shutdown purposes.
493 */
7d680f3b
CH		 494 if (cmd->transport_state & CMD_T_LUN_STOP) {
495 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
496 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 497
7d680f3b 498 cmd->transport_state &= ~CMD_T_ACTIVE;
c66ac9db
NB		 499 if (transport_off == 2)
500 transport_all_task_dev_remove_state(cmd);
a1d8b49a 501 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 502
a1d8b49a 503 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 504 return 1;
505 }
506 /*
507 * Determine if frontend context caller is requesting the stopping of
e3d6f909 508 * this command for frontend exceptions.
c66ac9db 509 */
7d680f3b
CH		 510 if (cmd->transport_state & CMD_T_STOP) {
511 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
512 __func__, __LINE__,
e3d6f909 513 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 514
c66ac9db
NB		 515 if (transport_off == 2)
516 transport_all_task_dev_remove_state(cmd);
517
518 /*
519 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
520 * to FE.
521 */
522 if (transport_off == 2)
523 cmd->se_lun = NULL;
a1d8b49a 524 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 525
a1d8b49a 526 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 527 return 1;
528 }
529 if (transport_off) {
7d680f3b 530 cmd->transport_state &= ~CMD_T_ACTIVE;
c66ac9db
NB		 531 if (transport_off == 2) {
532 transport_all_task_dev_remove_state(cmd);
533 /*
534 * Clear struct se_cmd->se_lun before the transport_off == 2
535 * handoff to fabric module.
536 */
537 cmd->se_lun = NULL;
538 /*
539 * Some fabric modules like tcm_loop can release
25985edc 540 * their internally allocated I/O reference now and
c66ac9db 541 * struct se_cmd now.
88dd9e26
NB		 542 *
543 * Fabric modules are expected to return '1' here if the
544 * se_cmd being passed is released at this point,
545 * or zero if not being released.
c66ac9db 546 */
e3d6f909 547 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 548 spin_unlock_irqrestore(
a1d8b49a 549 &cmd->t_state_lock, flags);
c66ac9db 550
88dd9e26 551 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 552 }
553 }
a1d8b49a 554 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 555
556 return 0;
557 } else if (t_state)
558 cmd->t_state = t_state;
a1d8b49a 559 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 560
561 return 0;
562}
563
564static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
565{
566 return transport_cmd_check_stop(cmd, 2, 0);
567}
568
569static void transport_lun_remove_cmd(struct se_cmd *cmd)
570{
e3d6f909 571 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 572 unsigned long flags;
573
574 if (!lun)
575 return;
576
a1d8b49a 577 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 578 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
579 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
580 transport_all_task_dev_remove_state(cmd);
c66ac9db 581 }
a1d8b49a 582 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 583
c66ac9db 584 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 585 if (!list_empty(&cmd->se_lun_node))
586 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 587 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
588}
589
590void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
591{
c8e31f26 592 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
8dc52b54 593 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 594
595 if (transport_cmd_check_stop_to_fabric(cmd))
596 return;
77039d1e 597 if (remove) {
3df8d40b 598 transport_remove_cmd_from_queue(cmd);
e6a2573f 599 transport_put_cmd(cmd);
77039d1e 600 }
c66ac9db
NB		 601}
602
f7a5cc0b
CH		 603static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
604 bool at_head)
c66ac9db
NB		 605{
606 struct se_device *dev = cmd->se_dev;
e3d6f909 607 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 608 unsigned long flags;
609
c66ac9db 610 if (t_state) {
a1d8b49a 611 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 612 cmd->t_state = t_state;
7d680f3b 613 cmd->transport_state |= CMD_T_ACTIVE;
a1d8b49a 614 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 615 }
616
617 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 618
619 /* If the cmd is already on the list, remove it before we add it */
620 if (!list_empty(&cmd->se_queue_node))
621 list_del(&cmd->se_queue_node);
622 else
623 atomic_inc(&qobj->queue_cnt);
624
f7a5cc0b 625 if (at_head)
07bde79a 626 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 627 else
07bde79a 628 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
7d680f3b 629 cmd->transport_state |= CMD_T_QUEUED;
c66ac9db
NB		 630 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
631
c66ac9db 632 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 633}
634
5951146d
AG		 635static struct se_cmd *
636transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 637{
5951146d 638 struct se_cmd *cmd;
c66ac9db
NB		 639 unsigned long flags;
640
641 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
642 if (list_empty(&qobj->qobj_list)) {
643 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
644 return NULL;
645 }
5951146d 646 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 647
7d680f3b 648 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2 649 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 650 atomic_dec(&qobj->queue_cnt);
651 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
652
5951146d 653 return cmd;
c66ac9db
NB		 654}
655
3df8d40b 656static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 657{
3df8d40b 658 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 659 unsigned long flags;
660
661 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
7d680f3b 662 if (!(cmd->transport_state & CMD_T_QUEUED)) {
c66ac9db
NB		 663 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
664 return;
665 }
7d680f3b 666 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2
RD		 667 atomic_dec(&qobj->queue_cnt);
668 list_del_init(&cmd->se_queue_node);
c66ac9db 669 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
c66ac9db
NB		 670}
671
672/*
673 * Completion function used by TCM subsystem plugins (such as FILEIO)
674 * for queueing up response from struct se_subsystem_api->do_task()
675 */
676void transport_complete_sync_cache(struct se_cmd *cmd, int good)
677{
a1d8b49a 678 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 679 struct se_task, t_list);
680
681 if (good) {
682 cmd->scsi_status = SAM_STAT_GOOD;
683 task->task_scsi_status = GOOD;
684 } else {
685 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
03e98c9e
NB		 686 task->task_se_cmd->scsi_sense_reason =
687 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
688
c66ac9db
NB		 689 }
690
691 transport_complete_task(task, good);
692}
693EXPORT_SYMBOL(transport_complete_sync_cache);
694
35e0e757
CH		 695static void target_complete_failure_work(struct work_struct *work)
696{
697 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
698
03e98c9e 699 transport_generic_request_failure(cmd);
35e0e757
CH		 700}
701
c66ac9db
NB		 702/* transport_complete_task():
703 *
704 * Called from interrupt and non interrupt context depending
705 * on the transport plugin.
706 */
707void transport_complete_task(struct se_task *task, int success)
708{
e3d6f909 709 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 710 struct se_device *dev = cmd->se_dev;
c66ac9db 711 unsigned long flags;
c66ac9db 712
a1d8b49a 713 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 714 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 715
716 /*
717 * See if any sense data exists, if so set the TASK_SENSE flag.
718 * Also check for any other post completion work that needs to be
719 * done by the plugins.
720 */
721 if (dev && dev->transport->transport_complete) {
722 if (dev->transport->transport_complete(task) != 0) {
723 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
ef804a84 724 task->task_flags |= TF_HAS_SENSE;
c66ac9db
NB		 725 success = 1;
726 }
727 }
728
729 /*
730 * See if we are waiting for outstanding struct se_task
731 * to complete for an exception condition
732 */
6c76bf95 733 if (task->task_flags & TF_REQUEST_STOP) {
a1d8b49a 734 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 735 complete(&task->task_stop_comp);
736 return;
737 }
2235007c
CH		 738
739 if (!success)
7d680f3b 740 cmd->transport_state |= CMD_T_FAILED;
2235007c 741
c66ac9db
NB		 742 /*
743 * Decrement the outstanding t_task_cdbs_left count. The last
744 * struct se_task from struct se_cmd will complete itself into the
745 * device queue depending upon int success.
746 */
6708bb27 747 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
a1d8b49a 748 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 749 return;
750 }
3d28934a
NB		 751 /*
752 * Check for case where an explict ABORT_TASK has been received
753 * and transport_wait_for_tasks() will be waiting for completion..
754 */
755 if (cmd->transport_state & CMD_T_ABORTED &&
756 cmd->transport_state & CMD_T_STOP) {
757 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
758 complete(&cmd->t_transport_stop_comp);
759 return;
760 } else if (cmd->transport_state & CMD_T_FAILED) {
41e16e98 761 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 762 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 763 } else {
35e0e757 764 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 765 }
35e0e757 766
35e0e757 767 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 768 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 769 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 770
35e0e757 771 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 772}
773EXPORT_SYMBOL(transport_complete_task);
774
6bb35e00
CH		 775void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
776{
777 struct se_task *task = list_entry(cmd->t_task_list.next,
778 struct se_task, t_list);
779
780 task->task_scsi_status = scsi_status;
781 transport_complete_task(task, scsi_status == GOOD);
782}
783EXPORT_SYMBOL(target_complete_cmd);
784
c66ac9db
NB		 785/*
786 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
787 * struct se_task list are ready to be added to the active execution list
788 * struct se_device
789
790 * Called with se_dev_t->execute_task_lock called.
791 */
792static inline int transport_add_task_check_sam_attr(
793 struct se_task *task,
794 struct se_task *task_prev,
795 struct se_device *dev)
796{
797 /*
798 * No SAM Task attribute emulation enabled, add to tail of
799 * execution queue
800 */
801 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
802 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
803 return 0;
804 }
805 /*
806 * HEAD_OF_QUEUE attribute for received CDB, which means
807 * the first task that is associated with a struct se_cmd goes to
808 * head of the struct se_device->execute_task_list, and task_prev
809 * after that for each subsequent task
810 */
e66ecd50 811 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 812 list_add(&task->t_execute_list,
813 (task_prev != NULL) ?
814 &task_prev->t_execute_list :
815 &dev->execute_task_list);
816
6708bb27 817 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 818 " in execution queue\n",
6708bb27 819 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 820 return 1;
821 }
822 /*
823 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
824 * transitioned from Dermant -> Active state, and are added to the end
825 * of the struct se_device->execute_task_list
826 */
827 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
828 return 0;
829}
830
831/* __transport_add_task_to_execute_queue():
832 *
833 * Called with se_dev_t->execute_task_lock called.
834 */
835static void __transport_add_task_to_execute_queue(
836 struct se_task *task,
837 struct se_task *task_prev,
838 struct se_device *dev)
839{
840 int head_of_queue;
841
842 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
843 atomic_inc(&dev->execute_tasks);
844
1880807a 845 if (task->t_state_active)
c66ac9db
NB		 846 return;
847 /*
848 * Determine if this task needs to go to HEAD_OF_QUEUE for the
849 * state list as well. Running with SAM Task Attribute emulation
850 * will always return head_of_queue == 0 here
851 */
852 if (head_of_queue)
853 list_add(&task->t_state_list, (task_prev) ?
854 &task_prev->t_state_list :
855 &dev->state_task_list);
856 else
857 list_add_tail(&task->t_state_list, &dev->state_task_list);
858
1880807a 859 task->t_state_active = true;
c66ac9db 860
6708bb27 861 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 862 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 863 task, dev);
864}
865
866static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
867{
42bf829e 868 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 869 struct se_task *task;
870 unsigned long flags;
871
a1d8b49a
AG		 872 spin_lock_irqsave(&cmd->t_state_lock, flags);
873 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db 874 spin_lock(&dev->execute_task_lock);
1880807a
CH		 875 if (!task->t_state_active) {
876 list_add_tail(&task->t_state_list,
877 &dev->state_task_list);
878 task->t_state_active = true;
879
880 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
881 task->task_se_cmd->se_tfo->get_task_tag(
882 task->task_se_cmd), task, dev);
883 }
c66ac9db
NB		 884 spin_unlock(&dev->execute_task_lock);
885 }
a1d8b49a 886 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 887}
888
4d2300cc 889static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
c66ac9db 890{
5951146d 891 struct se_device *dev = cmd->se_dev;
c66ac9db 892 struct se_task *task, *task_prev = NULL;
c66ac9db 893
a1d8b49a 894 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 895 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 896 continue;
897 /*
898 * __transport_add_task_to_execute_queue() handles the
899 * SAM Task Attribute emulation if enabled
900 */
901 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 902 task_prev = task;
903 }
4d2300cc
NB		 904}
905
906static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
907{
908 unsigned long flags;
909 struct se_device *dev = cmd->se_dev;
910
911 spin_lock_irqsave(&dev->execute_task_lock, flags);
912 __transport_add_tasks_from_cmd(cmd);
c66ac9db 913 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 914}
915
04629b7b
CH		 916void __transport_remove_task_from_execute_queue(struct se_task *task,
917 struct se_device *dev)
918{
919 list_del_init(&task->t_execute_list);
920 atomic_dec(&dev->execute_tasks);
921}
922
e26d99ae 923static void transport_remove_task_from_execute_queue(
c66ac9db
NB		 924 struct se_task *task,
925 struct se_device *dev)
926{
927 unsigned long flags;
928
04629b7b 929 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 930 return;
af57c3ac 931
c66ac9db 932 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 933 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 934 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
935}
936
07bde79a 937/*
f147abb4 938 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 939 */
940
941static void target_qf_do_work(struct work_struct *work)
942{
943 struct se_device *dev = container_of(work, struct se_device,
944 qf_work_queue);
bcac364a 945 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 946 struct se_cmd *cmd, *cmd_tmp;
947
948 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 949 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
950 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 951
bcac364a 952 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 953 list_del(&cmd->se_qf_node);
954 atomic_dec(&dev->dev_qf_count);
955 smp_mb__after_atomic_dec();
07bde79a 956
6708bb27 957 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 958 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 959 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 960 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
961 : "UNKNOWN");
f7a5cc0b
CH		 962
963 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 964 }
07bde79a
NB		 965}
966
c66ac9db
NB		 967unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
968{
969 switch (cmd->data_direction) {
970 case DMA_NONE:
971 return "NONE";
972 case DMA_FROM_DEVICE:
973 return "READ";
974 case DMA_TO_DEVICE:
975 return "WRITE";
976 case DMA_BIDIRECTIONAL:
977 return "BIDI";
978 default:
979 break;
980 }
981
982 return "UNKNOWN";
983}
984
985void transport_dump_dev_state(
986 struct se_device *dev,
987 char *b,
988 int *bl)
989{
990 *bl += sprintf(b + *bl, "Status: ");
991 switch (dev->dev_status) {
992 case TRANSPORT_DEVICE_ACTIVATED:
993 *bl += sprintf(b + *bl, "ACTIVATED");
994 break;
995 case TRANSPORT_DEVICE_DEACTIVATED:
996 *bl += sprintf(b + *bl, "DEACTIVATED");
997 break;
998 case TRANSPORT_DEVICE_SHUTDOWN:
999 *bl += sprintf(b + *bl, "SHUTDOWN");
1000 break;
1001 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1002 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1003 *bl += sprintf(b + *bl, "OFFLINE");
1004 break;
1005 default:
1006 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1007 break;
1008 }
1009
65586d51
NB		 1010 *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d",
1011 atomic_read(&dev->execute_tasks), dev->queue_depth);
c66ac9db 1012 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1013 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1014 *bl += sprintf(b + *bl, " ");
1015}
1016
c66ac9db
NB		 1017void transport_dump_vpd_proto_id(
1018 struct t10_vpd *vpd,
1019 unsigned char *p_buf,
1020 int p_buf_len)
1021{
1022 unsigned char buf[VPD_TMP_BUF_SIZE];
1023 int len;
1024
1025 memset(buf, 0, VPD_TMP_BUF_SIZE);
1026 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1027
1028 switch (vpd->protocol_identifier) {
1029 case 0x00:
1030 sprintf(buf+len, "Fibre Channel\n");
1031 break;
1032 case 0x10:
1033 sprintf(buf+len, "Parallel SCSI\n");
1034 break;
1035 case 0x20:
1036 sprintf(buf+len, "SSA\n");
1037 break;
1038 case 0x30:
1039 sprintf(buf+len, "IEEE 1394\n");
1040 break;
1041 case 0x40:
1042 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1043 " Protocol\n");
1044 break;
1045 case 0x50:
1046 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1047 break;
1048 case 0x60:
1049 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1050 break;
1051 case 0x70:
1052 sprintf(buf+len, "Automation/Drive Interface Transport"
1053 " Protocol\n");
1054 break;
1055 case 0x80:
1056 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1057 break;
1058 default:
1059 sprintf(buf+len, "Unknown 0x%02x\n",
1060 vpd->protocol_identifier);
1061 break;
1062 }
1063
1064 if (p_buf)
1065 strncpy(p_buf, buf, p_buf_len);
1066 else
6708bb27 1067 pr_debug("%s", buf);
c66ac9db
NB		 1068}
1069
1070void
1071transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1072{
1073 /*
1074 * Check if the Protocol Identifier Valid (PIV) bit is set..
1075 *
1076 * from spc3r23.pdf section 7.5.1
1077 */
1078 if (page_83[1] & 0x80) {
1079 vpd->protocol_identifier = (page_83[0] & 0xf0);
1080 vpd->protocol_identifier_set = 1;
1081 transport_dump_vpd_proto_id(vpd, NULL, 0);
1082 }
1083}
1084EXPORT_SYMBOL(transport_set_vpd_proto_id);
1085
1086int transport_dump_vpd_assoc(
1087 struct t10_vpd *vpd,
1088 unsigned char *p_buf,
1089 int p_buf_len)
1090{
1091 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1092 int ret = 0;
1093 int len;
c66ac9db
NB		 1094
1095 memset(buf, 0, VPD_TMP_BUF_SIZE);
1096 len = sprintf(buf, "T10 VPD Identifier Association: ");
1097
1098 switch (vpd->association) {
1099 case 0x00:
1100 sprintf(buf+len, "addressed logical unit\n");
1101 break;
1102 case 0x10:
1103 sprintf(buf+len, "target port\n");
1104 break;
1105 case 0x20:
1106 sprintf(buf+len, "SCSI target device\n");
1107 break;
1108 default:
1109 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1110 ret = -EINVAL;
c66ac9db
NB		 1111 break;
1112 }
1113
1114 if (p_buf)
1115 strncpy(p_buf, buf, p_buf_len);
1116 else
6708bb27 1117 pr_debug("%s", buf);
c66ac9db
NB		 1118
1119 return ret;
1120}
1121
1122int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1123{
1124 /*
1125 * The VPD identification association..
1126 *
1127 * from spc3r23.pdf Section 7.6.3.1 Table 297
1128 */
1129 vpd->association = (page_83[1] & 0x30);
1130 return transport_dump_vpd_assoc(vpd, NULL, 0);
1131}
1132EXPORT_SYMBOL(transport_set_vpd_assoc);
1133
1134int transport_dump_vpd_ident_type(
1135 struct t10_vpd *vpd,
1136 unsigned char *p_buf,
1137 int p_buf_len)
1138{
1139 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1140 int ret = 0;
1141 int len;
c66ac9db
NB		 1142
1143 memset(buf, 0, VPD_TMP_BUF_SIZE);
1144 len = sprintf(buf, "T10 VPD Identifier Type: ");
1145
1146 switch (vpd->device_identifier_type) {
1147 case 0x00:
1148 sprintf(buf+len, "Vendor specific\n");
1149 break;
1150 case 0x01:
1151 sprintf(buf+len, "T10 Vendor ID based\n");
1152 break;
1153 case 0x02:
1154 sprintf(buf+len, "EUI-64 based\n");
1155 break;
1156 case 0x03:
1157 sprintf(buf+len, "NAA\n");
1158 break;
1159 case 0x04:
1160 sprintf(buf+len, "Relative target port identifier\n");
1161 break;
1162 case 0x08:
1163 sprintf(buf+len, "SCSI name string\n");
1164 break;
1165 default:
1166 sprintf(buf+len, "Unsupported: 0x%02x\n",
1167 vpd->device_identifier_type);
e3d6f909 1168 ret = -EINVAL;
c66ac9db
NB		 1169 break;
1170 }
1171
e3d6f909
AG		 1172 if (p_buf) {
1173 if (p_buf_len < strlen(buf)+1)
1174 return -EINVAL;
c66ac9db 1175 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1176 } else {
6708bb27 1177 pr_debug("%s", buf);
e3d6f909 1178 }
c66ac9db
NB		 1179
1180 return ret;
1181}
1182
1183int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1184{
1185 /*
1186 * The VPD identifier type..
1187 *
1188 * from spc3r23.pdf Section 7.6.3.1 Table 298
1189 */
1190 vpd->device_identifier_type = (page_83[1] & 0x0f);
1191 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1192}
1193EXPORT_SYMBOL(transport_set_vpd_ident_type);
1194
1195int transport_dump_vpd_ident(
1196 struct t10_vpd *vpd,
1197 unsigned char *p_buf,
1198 int p_buf_len)
1199{
1200 unsigned char buf[VPD_TMP_BUF_SIZE];
1201 int ret = 0;
1202
1203 memset(buf, 0, VPD_TMP_BUF_SIZE);
1204
1205 switch (vpd->device_identifier_code_set) {
1206 case 0x01: /* Binary */
1207 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1208 &vpd->device_identifier[0]);
1209 break;
1210 case 0x02: /* ASCII */
1211 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1212 &vpd->device_identifier[0]);
1213 break;
1214 case 0x03: /* UTF-8 */
1215 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1216 &vpd->device_identifier[0]);
1217 break;
1218 default:
1219 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1220 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1221 ret = -EINVAL;
c66ac9db
NB		 1222 break;
1223 }
1224
1225 if (p_buf)
1226 strncpy(p_buf, buf, p_buf_len);
1227 else
6708bb27 1228 pr_debug("%s", buf);
c66ac9db
NB		 1229
1230 return ret;
1231}
1232
1233int
1234transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1235{
1236 static const char hex_str[] = "0123456789abcdef";
1237 int j = 0, i = 4; /* offset to start of the identifer */
1238
1239 /*
1240 * The VPD Code Set (encoding)
1241 *
1242 * from spc3r23.pdf Section 7.6.3.1 Table 296
1243 */
1244 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1245 switch (vpd->device_identifier_code_set) {
1246 case 0x01: /* Binary */
1247 vpd->device_identifier[j++] =
1248 hex_str[vpd->device_identifier_type];
1249 while (i < (4 + page_83[3])) {
1250 vpd->device_identifier[j++] =
1251 hex_str[(page_83[i] & 0xf0) >> 4];
1252 vpd->device_identifier[j++] =
1253 hex_str[page_83[i] & 0x0f];
1254 i++;
1255 }
1256 break;
1257 case 0x02: /* ASCII */
1258 case 0x03: /* UTF-8 */
1259 while (i < (4 + page_83[3]))
1260 vpd->device_identifier[j++] = page_83[i++];
1261 break;
1262 default:
1263 break;
1264 }
1265
1266 return transport_dump_vpd_ident(vpd, NULL, 0);
1267}
1268EXPORT_SYMBOL(transport_set_vpd_ident);
1269
1270static void core_setup_task_attr_emulation(struct se_device *dev)
1271{
1272 /*
1273 * If this device is from Target_Core_Mod/pSCSI, disable the
1274 * SAM Task Attribute emulation.
1275 *
1276 * This is currently not available in upsream Linux/SCSI Target
1277 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1278 */
e3d6f909 1279 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1280 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1281 return;
1282 }
1283
1284 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1285 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1286 " device\n", dev->transport->name,
1287 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1288}
1289
1290static void scsi_dump_inquiry(struct se_device *dev)
1291{
e3d6f909 1292 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1293 char buf[17];
c66ac9db
NB		 1294 int i, device_type;
1295 /*
1296 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1297 */
c66ac9db
NB		 1298 for (i = 0; i < 8; i++)
1299 if (wwn->vendor[i] >= 0x20)
e59a41b6 1300 buf[i] = wwn->vendor[i];
c66ac9db 1301 else
e59a41b6
SAS		 1302 buf[i] = ' ';
1303 buf[i] = '\0';
1304 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1305
c66ac9db
NB		 1306 for (i = 0; i < 16; i++)
1307 if (wwn->model[i] >= 0x20)
e59a41b6 1308 buf[i] = wwn->model[i];
c66ac9db 1309 else
e59a41b6
SAS		 1310 buf[i] = ' ';
1311 buf[i] = '\0';
1312 pr_debug(" Model: %s\n", buf);
c66ac9db 1313
c66ac9db
NB		 1314 for (i = 0; i < 4; i++)
1315 if (wwn->revision[i] >= 0x20)
e59a41b6 1316 buf[i] = wwn->revision[i];
c66ac9db 1317 else
e59a41b6
SAS		 1318 buf[i] = ' ';
1319 buf[i] = '\0';
1320 pr_debug(" Revision: %s\n", buf);
c66ac9db 1321
e3d6f909 1322 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1323 pr_debug(" Type: %s ", scsi_device_type(device_type));
1324 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1325 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1326}
1327
1328struct se_device *transport_add_device_to_core_hba(
1329 struct se_hba *hba,
1330 struct se_subsystem_api *transport,
1331 struct se_subsystem_dev *se_dev,
1332 u32 device_flags,
1333 void *transport_dev,
1334 struct se_dev_limits *dev_limits,
1335 const char *inquiry_prod,
1336 const char *inquiry_rev)
1337{
12a18bdc 1338 int force_pt;
c66ac9db
NB		 1339 struct se_device *dev;
1340
1341 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1342 if (!dev) {
1343 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1344 return NULL;
1345 }
c66ac9db 1346
e3d6f909 1347 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1348 dev->dev_flags = device_flags;
1349 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1350 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1351 dev->se_hba = hba;
1352 dev->se_sub_dev = se_dev;
1353 dev->transport = transport;
c66ac9db
NB		 1354 INIT_LIST_HEAD(&dev->dev_list);
1355 INIT_LIST_HEAD(&dev->dev_sep_list);
1356 INIT_LIST_HEAD(&dev->dev_tmr_list);
1357 INIT_LIST_HEAD(&dev->execute_task_list);
1358 INIT_LIST_HEAD(&dev->delayed_cmd_list);
c66ac9db 1359 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1360 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1361 spin_lock_init(&dev->execute_task_lock);
1362 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1363 spin_lock_init(&dev->dev_reservation_lock);
1364 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1365 spin_lock_init(&dev->se_port_lock);
1366 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1367 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1368 atomic_set(&dev->dev_ordered_id, 0);
1369
1370 se_dev_set_default_attribs(dev, dev_limits);
1371
1372 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1373 dev->creation_time = get_jiffies_64();
1374 spin_lock_init(&dev->stats_lock);
1375
1376 spin_lock(&hba->device_lock);
1377 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1378 hba->dev_count++;
1379 spin_unlock(&hba->device_lock);
1380 /*
1381 * Setup the SAM Task Attribute emulation for struct se_device
1382 */
1383 core_setup_task_attr_emulation(dev);
1384 /*
1385 * Force PR and ALUA passthrough emulation with internal object use.
1386 */
1387 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1388 /*
1389 * Setup the Reservations infrastructure for struct se_device
1390 */
1391 core_setup_reservations(dev, force_pt);
1392 /*
1393 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1394 */
1395 if (core_setup_alua(dev, force_pt) < 0)
1396 goto out;
1397
1398 /*
1399 * Startup the struct se_device processing thread
1400 */
1401 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1402 "LIO_%s", dev->transport->name);
c66ac9db 1403 if (IS_ERR(dev->process_thread)) {
6708bb27 1404 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1405 dev->transport->name);
c66ac9db
NB		 1406 goto out;
1407 }
07bde79a
NB		 1408 /*
1409 * Setup work_queue for QUEUE_FULL
1410 */
1411 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1412 /*
1413 * Preload the initial INQUIRY const values if we are doing
1414 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1415 * passthrough because this is being provided by the backend LLD.
1416 * This is required so that transport_get_inquiry() copies these
1417 * originals once back into DEV_T10_WWN(dev) for the virtual device
1418 * setup.
1419 */
e3d6f909 1420 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1421 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1422 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1423 " INQUIRY consts\n");
1424 goto out;
1425 }
1426
e3d6f909
AG		 1427 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1428 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1429 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1430 }
1431 scsi_dump_inquiry(dev);
1432
12a18bdc 1433 return dev;
c66ac9db 1434out:
c66ac9db
NB		 1435 kthread_stop(dev->process_thread);
1436
1437 spin_lock(&hba->device_lock);
1438 list_del(&dev->dev_list);
1439 hba->dev_count--;
1440 spin_unlock(&hba->device_lock);
1441
1442 se_release_vpd_for_dev(dev);
1443
c66ac9db
NB		 1444 kfree(dev);
1445
1446 return NULL;
1447}
1448EXPORT_SYMBOL(transport_add_device_to_core_hba);
1449
1450/* transport_generic_prepare_cdb():
1451 *
1452 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1453 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1454 * The point of this is since we are mapping iSCSI LUNs to
1455 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1456 * devices and HBAs for a loop.
1457 */
1458static inline void transport_generic_prepare_cdb(
1459 unsigned char *cdb)
1460{
1461 switch (cdb[0]) {
1462 case READ_10: /* SBC - RDProtect */
1463 case READ_12: /* SBC - RDProtect */
1464 case READ_16: /* SBC - RDProtect */
1465 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1466 case VERIFY: /* SBC - VRProtect */
1467 case VERIFY_16: /* SBC - VRProtect */
1468 case WRITE_VERIFY: /* SBC - VRProtect */
1469 case WRITE_VERIFY_12: /* SBC - VRProtect */
1470 break;
1471 default:
1472 cdb[1] &= 0x1f; /* clear logical unit number */
1473 break;
1474 }
1475}
1476
c66ac9db
NB		 1477static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1478
c66ac9db
NB		 1479/*
1480 * Used by fabric modules containing a local struct se_cmd within their
1481 * fabric dependent per I/O descriptor.
1482 */
1483void transport_init_se_cmd(
1484 struct se_cmd *cmd,
1485 struct target_core_fabric_ops *tfo,
1486 struct se_session *se_sess,
1487 u32 data_length,
1488 int data_direction,
1489 int task_attr,
1490 unsigned char *sense_buffer)
1491{
5951146d
AG		 1492 INIT_LIST_HEAD(&cmd->se_lun_node);
1493 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1494 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1495 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1496 INIT_LIST_HEAD(&cmd->se_cmd_list);
a1d8b49a
AG		 1497 INIT_LIST_HEAD(&cmd->t_task_list);
1498 init_completion(&cmd->transport_lun_fe_stop_comp);
1499 init_completion(&cmd->transport_lun_stop_comp);
1500 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1501 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1502 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1503 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1504
1505 cmd->se_tfo = tfo;
1506 cmd->se_sess = se_sess;
1507 cmd->data_length = data_length;
1508 cmd->data_direction = data_direction;
1509 cmd->sam_task_attr = task_attr;
1510 cmd->sense_buffer = sense_buffer;
1511}
1512EXPORT_SYMBOL(transport_init_se_cmd);
1513
1514static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1515{
1516 /*
1517 * Check if SAM Task Attribute emulation is enabled for this
1518 * struct se_device storage object
1519 */
5951146d 1520 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1521 return 0;
1522
e66ecd50 1523 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1524 pr_debug("SAM Task Attribute ACA"
c66ac9db 1525 " emulation is not supported\n");
e3d6f909 1526 return -EINVAL;
c66ac9db
NB		 1527 }
1528 /*
1529 * Used to determine when ORDERED commands should go from
1530 * Dormant to Active status.
1531 */
5951146d 1532 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1533 smp_mb__after_atomic_inc();
6708bb27 1534 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1535 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1536 cmd->se_dev->transport->name);
c66ac9db
NB		 1537 return 0;
1538}
1539
a12f41f8 1540/* target_setup_cmd_from_cdb():
c66ac9db
NB		 1541 *
1542 * Called from fabric RX Thread.
1543 */
a12f41f8 1544int target_setup_cmd_from_cdb(
c66ac9db
NB		 1545 struct se_cmd *cmd,
1546 unsigned char *cdb)
1547{
1548 int ret;
1549
1550 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1551 /*
1552 * Ensure that the received CDB is less than the max (252 + 8) bytes
1553 * for VARIABLE_LENGTH_CMD
1554 */
1555 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1556 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1557 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1558 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1559 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1560 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1561 return -EINVAL;
c66ac9db
NB		 1562 }
1563 /*
1564 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1565 * allocate the additional extended CDB buffer now.. Otherwise
1566 * setup the pointer from __t_task_cdb to t_task_cdb.
1567 */
a1d8b49a
AG		 1568 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1569 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1570 GFP_KERNEL);
6708bb27
AG		 1571 if (!cmd->t_task_cdb) {
1572 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1573 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1574 scsi_command_size(cdb),
a1d8b49a 1575 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1576 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1577 cmd->scsi_sense_reason =
1578 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1579 return -ENOMEM;
c66ac9db
NB		 1580 }
1581 } else
a1d8b49a 1582 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1583 /*
a1d8b49a 1584 * Copy the original CDB into cmd->
c66ac9db 1585 */
a1d8b49a 1586 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1587 /*
1588 * Setup the received CDB based on SCSI defined opcodes and
1589 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1590 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1591 * pointer is expected to be setup before we reach this point.
1592 */
1593 ret = transport_generic_cmd_sequencer(cmd, cdb);
1594 if (ret < 0)
1595 return ret;
1596 /*
1597 * Check for SAM Task Attribute Emulation
1598 */
1599 if (transport_check_alloc_task_attr(cmd) < 0) {
1600 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1601 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1602 return -EINVAL;
c66ac9db
NB		 1603 }
1604 spin_lock(&cmd->se_lun->lun_sep_lock);
1605 if (cmd->se_lun->lun_sep)
1606 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1607 spin_unlock(&cmd->se_lun->lun_sep_lock);
1608 return 0;
1609}
a12f41f8 1610EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1611
695434e1
NB		 1612/*
1613 * Used by fabric module frontends to queue tasks directly.
1614 * Many only be used from process context only
1615 */
1616int transport_handle_cdb_direct(
1617 struct se_cmd *cmd)
1618{
dd8ae59d
NB		 1619 int ret;
1620
695434e1
NB		 1621 if (!cmd->se_lun) {
1622 dump_stack();
6708bb27 1623 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1624 return -EINVAL;
1625 }
1626 if (in_interrupt()) {
1627 dump_stack();
6708bb27 1628 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1629 " from interrupt context\n");
1630 return -EINVAL;
1631 }
dd8ae59d 1632 /*
7d680f3b 1633 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
dd8ae59d
NB		 1634 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1635 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1636 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1637 *
1638 * Also, we don't take cmd->t_state_lock here as we only expect
1639 * this to be called for initial descriptor submission.
1640 */
1641 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1642 cmd->transport_state |= CMD_T_ACTIVE;
1643
dd8ae59d
NB		 1644 /*
1645 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1646 * so follow TRANSPORT_NEW_CMD processing thread context usage
1647 * and call transport_generic_request_failure() if necessary..
1648 */
1649 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1650 if (ret < 0)
1651 transport_generic_request_failure(cmd);
1652
dd8ae59d 1653 return 0;
695434e1
NB		 1654}
1655EXPORT_SYMBOL(transport_handle_cdb_direct);
1656
a6360785
NB		 1657/**
1658 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1659 *
1660 * @se_cmd: command descriptor to submit
1661 * @se_sess: associated se_sess for endpoint
1662 * @cdb: pointer to SCSI CDB
1663 * @sense: pointer to SCSI sense buffer
1664 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1665 * @data_length: fabric expected data transfer length
1666 * @task_addr: SAM task attribute
1667 * @data_dir: DMA data direction
1668 * @flags: flags for command submission from target_sc_flags_tables
1669 *
1670 * This may only be called from process context, and also currently
1671 * assumes internal allocation of fabric payload buffer by target-core.
1672 **/
1edcdb49 1673void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1674 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1675 u32 data_length, int task_attr, int data_dir, int flags)
1676{
1677 struct se_portal_group *se_tpg;
1678 int rc;
1679
1680 se_tpg = se_sess->se_tpg;
1681 BUG_ON(!se_tpg);
1682 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1683 BUG_ON(in_interrupt());
1684 /*
1685 * Initialize se_cmd for target operation. From this point
1686 * exceptions are handled by sending exception status via
1687 * target_core_fabric_ops->queue_status() callback
1688 */
1689 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1690 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1691 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1692 se_cmd->unknown_data_length = 1;
a6360785
NB		 1693 /*
1694 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1695 * se_sess->sess_cmd_list. A second kref_get here is necessary
1696 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1697 * kref_put() to happen during fabric packet acknowledgement.
1698 */
1699 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1700 /*
1701 * Signal bidirectional data payloads to target-core
1702 */
1703 if (flags & TARGET_SCF_BIDI_OP)
1704 se_cmd->se_cmd_flags |= SCF_BIDI;
1705 /*
1706 * Locate se_lun pointer and attach it to struct se_cmd
1707 */
735703ca
NB		 1708 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1709 transport_send_check_condition_and_sense(se_cmd,
1710 se_cmd->scsi_sense_reason, 0);
1711 target_put_sess_cmd(se_sess, se_cmd);
1712 return;
1713 }
a6360785
NB		 1714 /*
1715 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1716 * allocate the necessary tasks to complete the received CDB+data
1717 */
a12f41f8 1718 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca
NB		 1719 if (rc != 0) {
1720 transport_generic_request_failure(se_cmd);
1721 return;
1722 }
11e319ed
AG		 1723
1724 /*
1725 * Check if we need to delay processing because of ALUA
1726 * Active/NonOptimized primary access state..
1727 */
1728 core_alua_check_nonop_delay(se_cmd);
1729
a6360785
NB		 1730 /*
1731 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1732 * for immediate execution of READs, otherwise wait for
1733 * transport_generic_handle_data() to be called for WRITEs
1734 * when fabric has filled the incoming buffer.
1735 */
1736 transport_handle_cdb_direct(se_cmd);
1edcdb49 1737 return;
a6360785
NB		 1738}
1739EXPORT_SYMBOL(target_submit_cmd);
1740
9f0d05c2
NB		 1741static void target_complete_tmr_failure(struct work_struct *work)
1742{
1743 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1744
1745 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1746 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1747 transport_generic_free_cmd(se_cmd, 0);
1748}
1749
ea98d7f9
AG		 1750/**
1751 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1752 * for TMR CDBs
1753 *
1754 * @se_cmd: command descriptor to submit
1755 * @se_sess: associated se_sess for endpoint
1756 * @sense: pointer to SCSI sense buffer
1757 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1758 * @fabric_context: fabric context for TMR req
1759 * @tm_type: Type of TM request
c0974f89
NB		 1760 * @gfp: gfp type for caller
1761 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1762 * @flags: submit cmd flags
ea98d7f9
AG		 1763 *
1764 * Callable from all contexts.
1765 **/
1766
c7042cae 1767int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1768 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1769 void *fabric_tmr_ptr, unsigned char tm_type,
1770 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1771{
1772 struct se_portal_group *se_tpg;
1773 int ret;
1774
1775 se_tpg = se_sess->se_tpg;
1776 BUG_ON(!se_tpg);
1777
1778 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1779 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1780 /*
1781 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1782 * allocation failure.
1783 */
c0974f89 1784 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1785 if (ret < 0)
1786 return -ENOMEM;
ea98d7f9 1787
c0974f89
NB		 1788 if (tm_type == TMR_ABORT_TASK)
1789 se_cmd->se_tmr_req->ref_task_tag = tag;
1790
ea98d7f9
AG		 1791 /* See target_submit_cmd for commentary */
1792 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1793
ea98d7f9
AG		 1794 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1795 if (ret) {
9f0d05c2
NB		 1796 /*
1797 * For callback during failure handling, push this work off
1798 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1799 */
1800 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1801 schedule_work(&se_cmd->work);
c7042cae 1802 return 0;
ea98d7f9
AG		 1803 }
1804 transport_generic_handle_tmr(se_cmd);
c7042cae 1805 return 0;
ea98d7f9
AG		 1806}
1807EXPORT_SYMBOL(target_submit_tmr);
1808
c66ac9db
NB		 1809/*
1810 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1811 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1812 * complete setup in TCM process context w/ TFO->new_cmd_map().
1813 */
1814int transport_generic_handle_cdb_map(
1815 struct se_cmd *cmd)
1816{
e3d6f909 1817 if (!cmd->se_lun) {
c66ac9db 1818 dump_stack();
6708bb27 1819 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1820 return -EINVAL;
c66ac9db
NB		 1821 }
1822
f7a5cc0b 1823 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1824 return 0;
1825}
1826EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1827
1828/* transport_generic_handle_data():
1829 *
1830 *
1831 */
1832int transport_generic_handle_data(
1833 struct se_cmd *cmd)
1834{
1835 /*
1836 * For the software fabric case, then we assume the nexus is being
1837 * failed/shutdown when signals are pending from the kthread context
1838 * caller, so we return a failure. For the HW target mode case running
1839 * in interrupt code, the signal_pending() check is skipped.
1840 */
1841 if (!in_interrupt() && signal_pending(current))
e3d6f909 1842 return -EPERM;
c66ac9db
NB		 1843 /*
1844 * If the received CDB has aleady been ABORTED by the generic
1845 * target engine, we now call transport_check_aborted_status()
1846 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1847 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1848 * sequences at this point.
1849 */
1850 if (transport_check_aborted_status(cmd, 1) != 0)
1851 return 0;
1852
f7a5cc0b 1853 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1854 return 0;
1855}
1856EXPORT_SYMBOL(transport_generic_handle_data);
1857
1858/* transport_generic_handle_tmr():
1859 *
1860 *
1861 */
1862int transport_generic_handle_tmr(
1863 struct se_cmd *cmd)
1864{
f7a5cc0b 1865 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1866 return 0;
1867}
1868EXPORT_SYMBOL(transport_generic_handle_tmr);
1869
cdbb70bb
CH		 1870/*
1871 * If the task is active, request it to be stopped and sleep until it
1872 * has completed.
1873 */
1874bool target_stop_task(struct se_task *task, unsigned long *flags)
1875{
1876 struct se_cmd *cmd = task->task_se_cmd;
1877 bool was_active = false;
1878
1879 if (task->task_flags & TF_ACTIVE) {
1880 task->task_flags |= TF_REQUEST_STOP;
1881 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1882
1883 pr_debug("Task %p waiting to complete\n", task);
1884 wait_for_completion(&task->task_stop_comp);
1885 pr_debug("Task %p stopped successfully\n", task);
1886
1887 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1888 atomic_dec(&cmd->t_task_cdbs_left);
1889 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1890 was_active = true;
1891 }
1892
cdbb70bb
CH		 1893 return was_active;
1894}
1895
c66ac9db
NB		 1896static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1897{
1898 struct se_task *task, *task_tmp;
1899 unsigned long flags;
1900 int ret = 0;
1901
6708bb27 1902 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1903 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1904
1905 /*
1906 * No tasks remain in the execution queue
1907 */
a1d8b49a 1908 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1909 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1910 &cmd->t_task_list, t_list) {
04629b7b 1911 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1912 /*
1913 * If the struct se_task has not been sent and is not active,
1914 * remove the struct se_task from the execution queue.
1915 */
6c76bf95 1916 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1917 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1918 flags);
1919 transport_remove_task_from_execute_queue(task,
42bf829e 1920 cmd->se_dev);
c66ac9db 1921
04629b7b 1922 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1923 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1924 continue;
1925 }
1926
cdbb70bb 1927 if (!target_stop_task(task, &flags)) {
04629b7b 1928 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1929 ret++;
1930 }
c66ac9db 1931 }
a1d8b49a 1932 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1933
1934 return ret;
1935}
1936
c66ac9db
NB		 1937/*
1938 * Handle SAM-esque emulation for generic transport request failures.
1939 */
2fbff127 1940void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1941{
07bde79a
NB		 1942 int ret = 0;
1943
6708bb27 1944 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1945 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1946 cmd->t_task_cdb[0]);
03e98c9e 1947 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1948 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1949 cmd->t_state, cmd->scsi_sense_reason);
6708bb27 1950 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db 1951 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
7d680f3b
CH		 1952 " CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1953 cmd->t_task_list_num,
a1d8b49a
AG		 1954 atomic_read(&cmd->t_task_cdbs_left),
1955 atomic_read(&cmd->t_task_cdbs_sent),
1956 atomic_read(&cmd->t_task_cdbs_ex_left),
7d680f3b
CH		 1957 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1958 (cmd->transport_state & CMD_T_STOP) != 0,
1959 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1960
c66ac9db
NB		 1961 /*
1962 * For SAM Task Attribute emulation for failed struct se_cmd
1963 */
1964 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1965 transport_complete_task_attr(cmd);
1966
03e98c9e
NB		 1967 switch (cmd->scsi_sense_reason) {
1968 case TCM_NON_EXISTENT_LUN:
1969 case TCM_UNSUPPORTED_SCSI_OPCODE:
1970 case TCM_INVALID_CDB_FIELD:
1971 case TCM_INVALID_PARAMETER_LIST:
1972 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1973 case TCM_UNKNOWN_MODE_PAGE:
1974 case TCM_WRITE_PROTECTED:
1975 case TCM_CHECK_CONDITION_ABORT_CMD:
1976 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1977 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1978 break;
03e98c9e 1979 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1980 /*
1981 * No SENSE Data payload for this case, set SCSI Status
1982 * and queue the response to $FABRIC_MOD.
1983 *
1984 * Uses linux/include/scsi/scsi.h SAM status codes defs
1985 */
1986 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1987 /*
1988 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1989 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1990 * CONFLICT STATUS.
1991 *
1992 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1993 */
e3d6f909
AG		 1994 if (cmd->se_sess &&
1995 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1996 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1997 cmd->orig_fe_lun, 0x2C,
1998 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1999
07bde79a 2000 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2001 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2002 goto queue_full;
c66ac9db 2003 goto check_stop;
c66ac9db 2004 default:
6708bb27 2005 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 2006 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 2007 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2008 break;
2009 }
16ab8e60
NB		 2010 /*
2011 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2012 * make the call to transport_send_check_condition_and_sense()
2013 * directly. Otherwise expect the fabric to make the call to
2014 * transport_send_check_condition_and_sense() after handling
2015 * possible unsoliticied write data payloads.
2016 */
03e98c9e
NB		 2017 ret = transport_send_check_condition_and_sense(cmd,
2018 cmd->scsi_sense_reason, 0);
2019 if (ret == -EAGAIN || ret == -ENOMEM)
2020 goto queue_full;
07bde79a 2021
c66ac9db
NB		 2022check_stop:
2023 transport_lun_remove_cmd(cmd);
6708bb27 2024 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 2025 ;
07bde79a
NB		 2026 return;
2027
2028queue_full:
e057f533
CH		 2029 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2030 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 2031}
2fbff127 2032EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 2033
c66ac9db
NB		 2034static inline u32 transport_lba_21(unsigned char *cdb)
2035{
2036 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2037}
2038
2039static inline u32 transport_lba_32(unsigned char *cdb)
2040{
2041 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2042}
2043
2044static inline unsigned long long transport_lba_64(unsigned char *cdb)
2045{
2046 unsigned int __v1, __v2;
2047
2048 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2049 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2050
2051 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2052}
2053
2054/*
2055 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2056 */
2057static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2058{
2059 unsigned int __v1, __v2;
2060
2061 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2062 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2063
2064 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2065}
2066
2067static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2068{
2069 unsigned long flags;
2070
a1d8b49a 2071 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2072 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2073 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2074}
2075
c66ac9db
NB		 2076/*
2077 * Called from Fabric Module context from transport_execute_tasks()
2078 *
2079 * The return of this function determins if the tasks from struct se_cmd
2080 * get added to the execution queue in transport_execute_tasks(),
2081 * or are added to the delayed or ordered lists here.
2082 */
2083static inline int transport_execute_task_attr(struct se_cmd *cmd)
2084{
5951146d 2085 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2086 return 1;
2087 /*
25985edc 2088 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2089 * to allow the passed struct se_cmd list of tasks to the front of the list.
2090 */
e66ecd50 2091 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
6708bb27 2092 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2093 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2094 cmd->t_task_cdb[0],
c66ac9db
NB		 2095 cmd->se_ordered_id);
2096 return 1;
e66ecd50 2097 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d 2098 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2099 smp_mb__after_atomic_inc();
2100
6708bb27 2101 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2102 " list, se_ordered_id: %u\n",
a1d8b49a 2103 cmd->t_task_cdb[0],
c66ac9db
NB		 2104 cmd->se_ordered_id);
2105 /*
2106 * Add ORDERED command to tail of execution queue if
2107 * no other older commands exist that need to be
2108 * completed first.
2109 */
6708bb27 2110 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2111 return 1;
2112 } else {
2113 /*
2114 * For SIMPLE and UNTAGGED Task Attribute commands
2115 */
5951146d 2116 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2117 smp_mb__after_atomic_inc();
2118 }
2119 /*
2120 * Otherwise if one or more outstanding ORDERED task attribute exist,
2121 * add the dormant task(s) built for the passed struct se_cmd to the
2122 * execution queue and become in Active state for this struct se_device.
2123 */
5951146d 2124 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2125 /*
2126 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2127 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2128 */
5951146d 2129 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2130 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2131 list_add_tail(&cmd->se_delayed_node,
2132 &cmd->se_dev->delayed_cmd_list);
2133 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2134
6708bb27 2135 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2136 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2137 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2138 cmd->se_ordered_id);
2139 /*
2140 * Return zero to let transport_execute_tasks() know
2141 * not to add the delayed tasks to the execution list.
2142 */
2143 return 0;
2144 }
2145 /*
2146 * Otherwise, no ORDERED task attributes exist..
2147 */
2148 return 1;
2149}
2150
2151/*
2152 * Called from fabric module context in transport_generic_new_cmd() and
2153 * transport_generic_process_write()
2154 */
2155static int transport_execute_tasks(struct se_cmd *cmd)
2156{
2157 int add_tasks;
40be67f4 2158 struct se_device *se_dev = cmd->se_dev;
c66ac9db
NB		 2159 /*
2160 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2161 * has occurred that prevents execution.
c66ac9db 2162 */
6708bb27 2163 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2164 /*
2165 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2166 * attribute for the tasks of the received struct se_cmd CDB
2167 */
2168 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2169 if (!add_tasks)
c66ac9db
NB		 2170 goto execute_tasks;
2171 /*
4d2300cc
NB		 2172 * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2173 * adds associated se_tasks while holding dev->execute_task_lock
2174 * before I/O dispath to avoid a double spinlock access.
c66ac9db 2175 */
4d2300cc
NB		 2176 __transport_execute_tasks(se_dev, cmd);
2177 return 0;
c66ac9db 2178 }
4d2300cc 2179
c66ac9db 2180execute_tasks:
4d2300cc 2181 __transport_execute_tasks(se_dev, NULL);
c66ac9db
NB		 2182 return 0;
2183}
2184
2185/*
2186 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2187 * from struct se_device->execute_task_list and
2188 *
2189 * Called from transport_processing_thread()
2190 */
4d2300cc 2191static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
c66ac9db
NB		 2192{
2193 int error;
2194 struct se_cmd *cmd = NULL;
e3d6f909 2195 struct se_task *task = NULL;
c66ac9db
NB		 2196 unsigned long flags;
2197
c66ac9db 2198check_depth:
e3d6f909 2199 spin_lock_irq(&dev->execute_task_lock);
4d2300cc
NB		 2200 if (new_cmd != NULL)
2201 __transport_add_tasks_from_cmd(new_cmd);
2202
e3d6f909
AG		 2203 if (list_empty(&dev->execute_task_list)) {
2204 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2205 return 0;
2206 }
e3d6f909
AG		 2207 task = list_first_entry(&dev->execute_task_list,
2208 struct se_task, t_execute_list);
04629b7b 2209 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2210 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db 2211
e3d6f909 2212 cmd = task->task_se_cmd;
a1d8b49a 2213 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2214 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2215 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2216
a1d8b49a
AG		 2217 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2218 cmd->t_task_list_num)
7d680f3b 2219 cmd->transport_state |= CMD_T_SENT;
c66ac9db 2220
a1d8b49a 2221 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2222
6bb35e00
CH		 2223 if (cmd->execute_cmd)
2224 error = cmd->execute_cmd(cmd);
5bda90c8
CH		 2225 else
2226 error = dev->transport->do_task(task);
d29a5b6a 2227 if (error != 0) {
d29a5b6a
CH		 2228 spin_lock_irqsave(&cmd->t_state_lock, flags);
2229 task->task_flags &= ~TF_ACTIVE;
7d680f3b 2230 cmd->transport_state &= ~CMD_T_SENT;
d29a5b6a 2231 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
7d680f3b 2232
d29a5b6a 2233 transport_stop_tasks_for_cmd(cmd);
03e98c9e 2234 transport_generic_request_failure(cmd);
c66ac9db
NB		 2235 }
2236
4d2300cc 2237 new_cmd = NULL;
c66ac9db
NB		 2238 goto check_depth;
2239
2240 return 0;
2241}
2242
c66ac9db
NB		 2243static inline u32 transport_get_sectors_6(
2244 unsigned char *cdb,
2245 struct se_cmd *cmd,
2246 int *ret)
2247{
5951146d 2248 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2249
2250 /*
2251 * Assume TYPE_DISK for non struct se_device objects.
2252 * Use 8-bit sector value.
2253 */
2254 if (!dev)
2255 goto type_disk;
2256
2257 /*
2258 * Use 24-bit allocation length for TYPE_TAPE.
2259 */
e3d6f909 2260 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2261 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2262
2263 /*
2264 * Everything else assume TYPE_DISK Sector CDB location.
9b5cd7f3
RD		 2265 * Use 8-bit sector value. SBC-3 says:
2266 *
2267 * A TRANSFER LENGTH field set to zero specifies that 256
2268 * logical blocks shall be written. Any other value
2269 * specifies the number of logical blocks that shall be
2270 * written.
c66ac9db
NB		 2271 */
2272type_disk:
9b5cd7f3 2273 return cdb[4] ? : 256;
c66ac9db
NB		 2274}
2275
2276static inline u32 transport_get_sectors_10(
2277 unsigned char *cdb,
2278 struct se_cmd *cmd,
2279 int *ret)
2280{
5951146d 2281 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2282
2283 /*
2284 * Assume TYPE_DISK for non struct se_device objects.
2285 * Use 16-bit sector value.
2286 */
2287 if (!dev)
2288 goto type_disk;
2289
2290 /*
2291 * XXX_10 is not defined in SSC, throw an exception
2292 */
e3d6f909
AG		 2293 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2294 *ret = -EINVAL;
c66ac9db
NB		 2295 return 0;
2296 }
2297
2298 /*
2299 * Everything else assume TYPE_DISK Sector CDB location.
2300 * Use 16-bit sector value.
2301 */
2302type_disk:
2303 return (u32)(cdb[7] << 8) + cdb[8];
2304}
2305
2306static inline u32 transport_get_sectors_12(
2307 unsigned char *cdb,
2308 struct se_cmd *cmd,
2309 int *ret)
2310{
5951146d 2311 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2312
2313 /*
2314 * Assume TYPE_DISK for non struct se_device objects.
2315 * Use 32-bit sector value.
2316 */
2317 if (!dev)
2318 goto type_disk;
2319
2320 /*
2321 * XXX_12 is not defined in SSC, throw an exception
2322 */
e3d6f909
AG		 2323 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2324 *ret = -EINVAL;
c66ac9db
NB		 2325 return 0;
2326 }
2327
2328 /*
2329 * Everything else assume TYPE_DISK Sector CDB location.
2330 * Use 32-bit sector value.
2331 */
2332type_disk:
2333 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2334}
2335
2336static inline u32 transport_get_sectors_16(
2337 unsigned char *cdb,
2338 struct se_cmd *cmd,
2339 int *ret)
2340{
5951146d 2341 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2342
2343 /*
2344 * Assume TYPE_DISK for non struct se_device objects.
2345 * Use 32-bit sector value.
2346 */
2347 if (!dev)
2348 goto type_disk;
2349
2350 /*
2351 * Use 24-bit allocation length for TYPE_TAPE.
2352 */
e3d6f909 2353 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2354 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2355
2356type_disk:
2357 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2358 (cdb[12] << 8) + cdb[13];
2359}
2360
2361/*
2362 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2363 */
2364static inline u32 transport_get_sectors_32(
2365 unsigned char *cdb,
2366 struct se_cmd *cmd,
2367 int *ret)
2368{
2369 /*
2370 * Assume TYPE_DISK for non struct se_device objects.
2371 * Use 32-bit sector value.
2372 */
2373 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2374 (cdb[30] << 8) + cdb[31];
2375
2376}
2377
2378static inline u32 transport_get_size(
2379 u32 sectors,
2380 unsigned char *cdb,
2381 struct se_cmd *cmd)
2382{
5951146d 2383 struct se_device *dev = cmd->se_dev;
c66ac9db 2384
e3d6f909 2385 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2386 if (cdb[1] & 1) { /* sectors */
e3d6f909 2387 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2388 } else /* bytes */
2389 return sectors;
2390 }
8b1e1244 2391
6708bb27 2392 pr_debug("Returning block_size: %u, sectors: %u == %u for"
8b1e1244
AG		 2393 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size,
2394 sectors, dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2395 dev->transport->name);
2396
e3d6f909 2397 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2398}
2399
c66ac9db
NB		 2400static void transport_xor_callback(struct se_cmd *cmd)
2401{
2402 unsigned char *buf, *addr;
ec98f782 2403 struct scatterlist *sg;
c66ac9db
NB		 2404 unsigned int offset;
2405 int i;
ec98f782 2406 int count;
c66ac9db
NB		 2407 /*
2408 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2409 *
2410 * 1) read the specified logical block(s);
2411 * 2) transfer logical blocks from the data-out buffer;
2412 * 3) XOR the logical blocks transferred from the data-out buffer with
2413 * the logical blocks read, storing the resulting XOR data in a buffer;
2414 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2415 * blocks transferred from the data-out buffer; and
2416 * 5) transfer the resulting XOR data to the data-in buffer.
2417 */
2418 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2419 if (!buf) {
2420 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2421 return;
2422 }
2423 /*
ec98f782 2424 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2425 * into the locally allocated *buf
2426 */
ec98f782
AG		 2427 sg_copy_to_buffer(cmd->t_data_sg,
2428 cmd->t_data_nents,
2429 buf,
2430 cmd->data_length);
2431
c66ac9db
NB		 2432 /*
2433 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2434 * cmd->t_mem_bidi_list
c66ac9db
NB		 2435 */
2436
2437 offset = 0;
ec98f782 2438 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
ca747d61 2439 addr = kmap_atomic(sg_page(sg));
ec98f782 2440 if (!addr)
c66ac9db
NB		 2441 goto out;
2442
ec98f782
AG		 2443 for (i = 0; i < sg->length; i++)
2444 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2445
ec98f782 2446 offset += sg->length;
ca747d61 2447 kunmap_atomic(addr);
c66ac9db 2448 }
ec98f782 2449
c66ac9db
NB		 2450out:
2451 kfree(buf);
2452}
2453
2454/*
2455 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2456 */
2457static int transport_get_sense_data(struct se_cmd *cmd)
2458{
2459 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2460 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2461 struct se_task *task = NULL, *task_tmp;
2462 unsigned long flags;
2463 u32 offset = 0;
2464
e3d6f909
AG		 2465 WARN_ON(!cmd->se_lun);
2466
42bf829e
CH		 2467 if (!dev)
2468 return 0;
2469
a1d8b49a 2470 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2471 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2472 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2473 return 0;
2474 }
2475
2476 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2477 &cmd->t_task_list, t_list) {
ef804a84 2478 if (!(task->task_flags & TF_HAS_SENSE))
c66ac9db
NB		 2479 continue;
2480
e3d6f909 2481 if (!dev->transport->get_sense_buffer) {
6708bb27 2482 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2483 " is NULL\n");
2484 continue;
2485 }
2486
e3d6f909 2487 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2488 if (!sense_buffer) {
04629b7b 2489 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2490 " sense buffer for task with sense\n",
04629b7b 2491 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2492 continue;
2493 }
a1d8b49a 2494 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2495
e3d6f909 2496 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2497 TRANSPORT_SENSE_BUFFER);
2498
5951146d 2499 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2500 TRANSPORT_SENSE_BUFFER);
2501 cmd->scsi_status = task->task_scsi_status;
2502 /* Automatically padded */
2503 cmd->scsi_sense_length =
2504 (TRANSPORT_SENSE_BUFFER + offset);
2505
6708bb27 2506 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2507 " and sense\n",
e3d6f909 2508 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2509 cmd->scsi_status);
2510 return 0;
2511 }
a1d8b49a 2512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2513
2514 return -1;
2515}
2516
ec98f782
AG		 2517static inline long long transport_dev_end_lba(struct se_device *dev)
2518{
2519 return dev->transport->get_blocks(dev) + 1;
2520}
2521
2522static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2523{
2524 struct se_device *dev = cmd->se_dev;
2525 u32 sectors;
2526
2527 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2528 return 0;
2529
2530 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2531
6708bb27
AG		 2532 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2533 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2534 " transport_dev_end_lba(): %llu\n",
2535 cmd->t_task_lba, sectors,
2536 transport_dev_end_lba(dev));
7abbe7f3 2537 return -EINVAL;
ec98f782
AG		 2538 }
2539
7abbe7f3 2540 return 0;
ec98f782
AG		 2541}
2542
706d5860
NB		 2543static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2544{
2545 /*
2546 * Determine if the received WRITE_SAME is used to for direct
2547 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2548 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2549 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2550 */
2551 int passthrough = (dev->transport->transport_type ==
2552 TRANSPORT_PLUGIN_PHBA_PDEV);
2553
2554 if (!passthrough) {
2555 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2556 pr_err("WRITE_SAME PBDATA and LBDATA"
2557 " bits not supported for Block Discard"
2558 " Emulation\n");
2559 return -ENOSYS;
2560 }
2561 /*
2562 * Currently for the emulated case we only accept
2563 * tpws with the UNMAP=1 bit set.
2564 */
2565 if (!(flags[0] & 0x08)) {
2566 pr_err("WRITE_SAME w/o UNMAP bit not"
2567 " supported for Block Discard Emulation\n");
2568 return -ENOSYS;
2569 }
2570 }
2571
2572 return 0;
2573}
2574
c66ac9db
NB		 2575/* transport_generic_cmd_sequencer():
2576 *
2577 * Generic Command Sequencer that should work for most DAS transport
2578 * drivers.
2579 *
a12f41f8 2580 * Called from target_setup_cmd_from_cdb() in the $FABRIC_MOD
c66ac9db
NB		 2581 * RX Thread.
2582 *
2583 * FIXME: Need to support other SCSI OPCODES where as well.
2584 */
2585static int transport_generic_cmd_sequencer(
2586 struct se_cmd *cmd,
2587 unsigned char *cdb)
2588{
5951146d 2589 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2590 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2591 int ret = 0, sector_ret = 0, passthrough;
2592 u32 sectors = 0, size = 0, pr_reg_type = 0;
2593 u16 service_action;
2594 u8 alua_ascq = 0;
2595 /*
2596 * Check for an existing UNIT ATTENTION condition
2597 */
2598 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2599 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2600 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2601 return -EINVAL;
c66ac9db
NB		 2602 }
2603 /*
2604 * Check status of Asymmetric Logical Unit Assignment port
2605 */
e3d6f909 2606 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2607 if (ret != 0) {
c66ac9db 2608 /*
25985edc 2609 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2610 * The ALUA additional sense code qualifier (ASCQ) is determined
2611 * by the ALUA primary or secondary access state..
2612 */
2613 if (ret > 0) {
6708bb27 2614 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2615 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2616 cmd->se_tfo->get_fabric_name(), alua_ascq);
8b1e1244 2617
c66ac9db
NB		 2618 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2619 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2620 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2621 return -EINVAL;
c66ac9db
NB		 2622 }
2623 goto out_invalid_cdb_field;
2624 }
2625 /*
2626 * Check status for SPC-3 Persistent Reservations
2627 */
e3d6f909
AG		 2628 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2629 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2630 cmd, cdb, pr_reg_type) != 0) {
2631 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2632 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
087a03b3 2633 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
03e98c9e
NB		 2634 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2635 return -EBUSY;
2636 }
c66ac9db
NB		 2637 /*
2638 * This means the CDB is allowed for the SCSI Initiator port
2639 * when said port is *NOT* holding the legacy SPC-2 or
2640 * SPC-3 Persistent Reservation.
2641 */
2642 }
2643
5bda90c8
CH		 2644 /*
2645 * If we operate in passthrough mode we skip most CDB emulation and
2646 * instead hand the commands down to the physical SCSI device.
2647 */
2648 passthrough =
2649 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2650
c66ac9db
NB		 2651 switch (cdb[0]) {
2652 case READ_6:
2653 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2654 if (sector_ret)
2655 goto out_unsupported_cdb;
2656 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2657 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2658 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2659 break;
2660 case READ_10:
2661 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2662 if (sector_ret)
2663 goto out_unsupported_cdb;
2664 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2665 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2666 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2667 break;
2668 case READ_12:
2669 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2670 if (sector_ret)
2671 goto out_unsupported_cdb;
2672 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2673 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2674 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2675 break;
2676 case READ_16:
2677 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2678 if (sector_ret)
2679 goto out_unsupported_cdb;
2680 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2681 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2682 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2683 break;
2684 case WRITE_6:
2685 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2686 if (sector_ret)
2687 goto out_unsupported_cdb;
2688 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2689 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2690 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2691 break;
2692 case WRITE_10:
2693 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2694 if (sector_ret)
2695 goto out_unsupported_cdb;
2696 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2697 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2698 if (cdb[1] & 0x8)
2699 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2700 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2701 break;
2702 case WRITE_12:
2703 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2704 if (sector_ret)
2705 goto out_unsupported_cdb;
2706 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2707 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2708 if (cdb[1] & 0x8)
2709 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2710 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2711 break;
2712 case WRITE_16:
2713 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2714 if (sector_ret)
2715 goto out_unsupported_cdb;
2716 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2717 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2718 if (cdb[1] & 0x8)
2719 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2720 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2721 break;
2722 case XDWRITEREAD_10:
2723 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2724 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2725 goto out_invalid_cdb_field;
2726 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2727 if (sector_ret)
2728 goto out_unsupported_cdb;
2729 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2730 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2731 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2732
5bda90c8
CH		 2733 /*
2734 * Do now allow BIDI commands for passthrough mode.
2735 */
2736 if (passthrough)
7c1c6af3 2737 goto out_unsupported_cdb;
5bda90c8 2738
c66ac9db 2739 /*
35e0e757 2740 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2741 */
2742 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2743 if (cdb[1] & 0x8)
2744 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2745 break;
2746 case VARIABLE_LENGTH_CMD:
2747 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2748 switch (service_action) {
2749 case XDWRITEREAD_32:
2750 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2751 if (sector_ret)
2752 goto out_unsupported_cdb;
2753 size = transport_get_size(sectors, cdb, cmd);
2754 /*
2755 * Use WRITE_32 and READ_32 opcodes for the emulated
2756 * XDWRITE_READ_32 logic.
2757 */
a1d8b49a 2758 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2759 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2760
5bda90c8
CH		 2761 /*
2762 * Do now allow BIDI commands for passthrough mode.
2763 */
c66ac9db 2764 if (passthrough)
7c1c6af3 2765 goto out_unsupported_cdb;
5bda90c8 2766
c66ac9db 2767 /*
35e0e757
CH		 2768 * Setup BIDI XOR callback to be run during after I/O
2769 * completion.
c66ac9db
NB		 2770 */
2771 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2772 if (cdb[1] & 0x8)
2773 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2774 break;
2775 case WRITE_SAME_32:
2776 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2777 if (sector_ret)
2778 goto out_unsupported_cdb;
dd3a5ad8 2779
6708bb27 2780 if (sectors)
12850626 2781 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2782 else {
2783 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2784 " supported\n");
2785 goto out_invalid_cdb_field;
2786 }
dd3a5ad8 2787
a1d8b49a 2788 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2789 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2790
706d5860 2791 if (target_check_write_same_discard(&cdb[10], dev) < 0)
67236c44 2792 goto out_unsupported_cdb;
5bda90c8 2793 if (!passthrough)
6bb35e00 2794 cmd->execute_cmd = target_emulate_write_same;
c66ac9db
NB		 2795 break;
2796 default:
6708bb27 2797 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2798 " 0x%04x not supported\n", service_action);
2799 goto out_unsupported_cdb;
2800 }
2801 break;
e434f1f1 2802 case MAINTENANCE_IN:
e3d6f909 2803 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2804 /* MAINTENANCE_IN from SCC-2 */
2805 /*
2806 * Check for emulated MI_REPORT_TARGET_PGS.
2807 */
e76a35d6
CH		 2808 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2809 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
6bb35e00 2810 cmd->execute_cmd =
e76a35d6 2811 target_emulate_report_target_port_groups;
c66ac9db
NB		 2812 }
2813 size = (cdb[6] << 24) | (cdb[7] << 16) |
2814 (cdb[8] << 8) | cdb[9];
2815 } else {
2816 /* GPCMD_SEND_KEY from multi media commands */
2817 size = (cdb[8] << 8) + cdb[9];
2818 }
05d1c7c0 2819 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2820 break;
2821 case MODE_SELECT:
2822 size = cdb[4];
2823 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2824 break;
2825 case MODE_SELECT_10:
2826 size = (cdb[7] << 8) + cdb[8];
2827 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2828 break;
2829 case MODE_SENSE:
2830 size = cdb[4];
05d1c7c0 2831 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2832 if (!passthrough)
6bb35e00 2833 cmd->execute_cmd = target_emulate_modesense;
c66ac9db
NB		 2834 break;
2835 case MODE_SENSE_10:
5bda90c8
CH		 2836 size = (cdb[7] << 8) + cdb[8];
2837 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2838 if (!passthrough)
6bb35e00 2839 cmd->execute_cmd = target_emulate_modesense;
5bda90c8 2840 break;
c66ac9db
NB		 2841 case GPCMD_READ_BUFFER_CAPACITY:
2842 case GPCMD_SEND_OPC:
2843 case LOG_SELECT:
2844 case LOG_SENSE:
2845 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2846 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2847 break;
2848 case READ_BLOCK_LIMITS:
2849 size = READ_BLOCK_LEN;
05d1c7c0 2850 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2851 break;
2852 case GPCMD_GET_CONFIGURATION:
2853 case GPCMD_READ_FORMAT_CAPACITIES:
2854 case GPCMD_READ_DISC_INFO:
2855 case GPCMD_READ_TRACK_RZONE_INFO:
2856 size = (cdb[7] << 8) + cdb[8];
2857 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2858 break;
2859 case PERSISTENT_RESERVE_IN:
617c0e06 2860 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
6bb35e00 2861 cmd->execute_cmd = target_scsi3_emulate_pr_in;
617c0e06
CH		 2862 size = (cdb[7] << 8) + cdb[8];
2863 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2864 break;
c66ac9db 2865 case PERSISTENT_RESERVE_OUT:
617c0e06 2866 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
6bb35e00 2867 cmd->execute_cmd = target_scsi3_emulate_pr_out;
c66ac9db 2868 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2869 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2870 break;
2871 case GPCMD_MECHANISM_STATUS:
2872 case GPCMD_READ_DVD_STRUCTURE:
2873 size = (cdb[8] << 8) + cdb[9];
2874 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2875 break;
2876 case READ_POSITION:
2877 size = READ_POSITION_LEN;
05d1c7c0 2878 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2879 break;
e434f1f1 2880 case MAINTENANCE_OUT:
e3d6f909 2881 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2882 /* MAINTENANCE_OUT from SCC-2
2883 *
2884 * Check for emulated MO_SET_TARGET_PGS.
2885 */
e76a35d6
CH		 2886 if (cdb[1] == MO_SET_TARGET_PGS &&
2887 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
6bb35e00 2888 cmd->execute_cmd =
e76a35d6 2889 target_emulate_set_target_port_groups;
c66ac9db
NB		 2890 }
2891
2892 size = (cdb[6] << 24) | (cdb[7] << 16) |
2893 (cdb[8] << 8) | cdb[9];
2894 } else {
2895 /* GPCMD_REPORT_KEY from multi media commands */
2896 size = (cdb[8] << 8) + cdb[9];
2897 }
05d1c7c0 2898 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2899 break;
2900 case INQUIRY:
2901 size = (cdb[3] << 8) + cdb[4];
2902 /*
2903 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2904 * See spc4r17 section 5.3
2905 */
5951146d 2906 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2907 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2908 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2909 if (!passthrough)
6bb35e00 2910 cmd->execute_cmd = target_emulate_inquiry;
c66ac9db
NB		 2911 break;
2912 case READ_BUFFER:
2913 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2914 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2915 break;
2916 case READ_CAPACITY:
2917 size = READ_CAP_LEN;
05d1c7c0 2918 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2919 if (!passthrough)
6bb35e00 2920 cmd->execute_cmd = target_emulate_readcapacity;
c66ac9db
NB		 2921 break;
2922 case READ_MEDIA_SERIAL_NUMBER:
2923 case SECURITY_PROTOCOL_IN:
2924 case SECURITY_PROTOCOL_OUT:
2925 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2926 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2927 break;
2928 case SERVICE_ACTION_IN:
5bda90c8
CH		 2929 switch (cmd->t_task_cdb[1] & 0x1f) {
2930 case SAI_READ_CAPACITY_16:
2931 if (!passthrough)
6bb35e00 2932 cmd->execute_cmd =
5bda90c8
CH		 2933 target_emulate_readcapacity_16;
2934 break;
2935 default:
2936 if (passthrough)
2937 break;
2938
2939 pr_err("Unsupported SA: 0x%02x\n",
2940 cmd->t_task_cdb[1] & 0x1f);
b168fe8c 2941 goto out_invalid_cdb_field;
5bda90c8
CH		 2942 }
2943 /*FALLTHROUGH*/
c66ac9db
NB		 2944 case ACCESS_CONTROL_IN:
2945 case ACCESS_CONTROL_OUT:
2946 case EXTENDED_COPY:
2947 case READ_ATTRIBUTE:
2948 case RECEIVE_COPY_RESULTS:
2949 case WRITE_ATTRIBUTE:
2950 size = (cdb[10] << 24) | (cdb[11] << 16) |
2951 (cdb[12] << 8) | cdb[13];
05d1c7c0 2952 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2953 break;
2954 case RECEIVE_DIAGNOSTIC:
2955 case SEND_DIAGNOSTIC:
2956 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2957 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2958 break;
2959/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2960#if 0
2961 case GPCMD_READ_CD:
2962 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2963 size = (2336 * sectors);
05d1c7c0 2964 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2965 break;
2966#endif
2967 case READ_TOC:
2968 size = cdb[8];
05d1c7c0 2969 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2970 break;
2971 case REQUEST_SENSE:
2972 size = cdb[4];
05d1c7c0 2973 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2974 if (!passthrough)
6bb35e00 2975 cmd->execute_cmd = target_emulate_request_sense;
c66ac9db
NB		 2976 break;
2977 case READ_ELEMENT_STATUS:
2978 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2979 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2980 break;
2981 case WRITE_BUFFER:
2982 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2983 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2984 break;
2985 case RESERVE:
2986 case RESERVE_10:
2987 /*
2988 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2989 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2990 */
2991 if (cdb[0] == RESERVE_10)
2992 size = (cdb[7] << 8) | cdb[8];
2993 else
2994 size = cmd->data_length;
2995
2996 /*
2997 * Setup the legacy emulated handler for SPC-2 and
2998 * >= SPC-3 compatible reservation handling (CRH=1)
2999 * Otherwise, we assume the underlying SCSI logic is
3000 * is running in SPC_PASSTHROUGH, and wants reservations
3001 * emulation disabled.
3002 */
e76a35d6 3003 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
6bb35e00 3004 cmd->execute_cmd = target_scsi2_reservation_reserve;
c66ac9db
NB		 3005 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3006 break;
3007 case RELEASE:
3008 case RELEASE_10:
3009 /*
3010 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3011 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3012 */
3013 if (cdb[0] == RELEASE_10)
3014 size = (cdb[7] << 8) | cdb[8];
3015 else
3016 size = cmd->data_length;
3017
e76a35d6 3018 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
6bb35e00 3019 cmd->execute_cmd = target_scsi2_reservation_release;
c66ac9db
NB		 3020 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3021 break;
3022 case SYNCHRONIZE_CACHE:
8e94b8db 3023 case SYNCHRONIZE_CACHE_16:
c66ac9db
NB		 3024 /*
3025 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3026 */
3027 if (cdb[0] == SYNCHRONIZE_CACHE) {
3028 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3029 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3030 } else {
3031 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3032 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3033 }
3034 if (sector_ret)
3035 goto out_unsupported_cdb;
3036
3037 size = transport_get_size(sectors, cdb, cmd);
3038 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3039
5bda90c8 3040 if (passthrough)
c66ac9db 3041 break;
5bda90c8 3042
c66ac9db
NB		 3043 /*
3044 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3045 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3046 */
7abbe7f3
NB		 3047 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3048 if (transport_cmd_get_valid_sectors(cmd) < 0)
3049 goto out_invalid_cdb_field;
3050 }
6bb35e00 3051 cmd->execute_cmd = target_emulate_synchronize_cache;
c66ac9db
NB		 3052 break;
3053 case UNMAP:
3054 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3055 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 3056 if (!passthrough)
6bb35e00 3057 cmd->execute_cmd = target_emulate_unmap;
c66ac9db
NB		 3058 break;
3059 case WRITE_SAME_16:
3060 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3061 if (sector_ret)
3062 goto out_unsupported_cdb;
dd3a5ad8 3063
6708bb27 3064 if (sectors)
12850626 3065 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3066 else {
3067 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3068 goto out_invalid_cdb_field;
3069 }
dd3a5ad8 3070
5db0753b 3071 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3072 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3073
3074 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 3075 goto out_unsupported_cdb;
5bda90c8 3076 if (!passthrough)
6bb35e00 3077 cmd->execute_cmd = target_emulate_write_same;
706d5860
NB		 3078 break;
3079 case WRITE_SAME:
3080 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3081 if (sector_ret)
3082 goto out_unsupported_cdb;
3083
3084 if (sectors)
12850626 3085 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3086 else {
3087 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3088 goto out_invalid_cdb_field;
c66ac9db 3089 }
706d5860
NB		 3090
3091 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3092 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3093 /*
3094 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3095 * of byte 1 bit 3 UNMAP instead of original reserved field
3096 */
3097 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 3098 goto out_unsupported_cdb;
5bda90c8 3099 if (!passthrough)
6bb35e00 3100 cmd->execute_cmd = target_emulate_write_same;
c66ac9db
NB		 3101 break;
3102 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 3103 case ERASE:
c66ac9db
NB		 3104 case REZERO_UNIT:
3105 case SEEK_10:
c66ac9db
NB		 3106 case SPACE:
3107 case START_STOP:
3108 case TEST_UNIT_READY:
3109 case VERIFY:
3110 case WRITE_FILEMARKS:
5bda90c8
CH		 3111 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3112 if (!passthrough)
6bb35e00 3113 cmd->execute_cmd = target_emulate_noop;
5bda90c8
CH		 3114 break;
3115 case GPCMD_CLOSE_TRACK:
3116 case INITIALIZE_ELEMENT_STATUS:
3117 case GPCMD_LOAD_UNLOAD:
3118 case GPCMD_SET_SPEED:
c66ac9db
NB		 3119 case MOVE_MEDIUM:
3120 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3121 break;
3122 case REPORT_LUNS:
6bb35e00 3123 cmd->execute_cmd = target_report_luns;
c66ac9db
NB		 3124 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3125 /*
3126 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3127 * See spc4r17 section 5.3
3128 */
5951146d 3129 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3130 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3131 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3132 break;
ed0b2144
SH		 3133 case GET_EVENT_STATUS_NOTIFICATION:
3134 size = (cdb[7] << 8) | cdb[8];
3135 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3136 break;
c66ac9db 3137 default:
6708bb27 3138 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3139 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3140 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3141 goto out_unsupported_cdb;
3142 }
3143
b0d79946
SAS		 3144 if (cmd->unknown_data_length)
3145 cmd->data_length = size;
3146
c66ac9db 3147 if (size != cmd->data_length) {
6708bb27 3148 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3149 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3150 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3151 cmd->data_length, size, cdb[0]);
3152
3153 cmd->cmd_spdtl = size;
3154
3155 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3156 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3157 " WRITE data\n");
3158 goto out_invalid_cdb_field;
3159 }
3160 /*
3161 * Reject READ_* or WRITE_* with overflow/underflow for
3162 * type SCF_SCSI_DATA_SG_IO_CDB.
3163 */
6708bb27
AG		 3164 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3165 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3166 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3167 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3168 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3169 goto out_invalid_cdb_field;
3170 }
3171
3172 if (size > cmd->data_length) {
3173 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3174 cmd->residual_count = (size - cmd->data_length);
3175 } else {
3176 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3177 cmd->residual_count = (cmd->data_length - size);
3178 }
3179 cmd->data_length = size;
3180 }
3181
015487b8 3182 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB &&
bebe2fdc
CH		 3183 (sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors ||
3184 sectors > dev->se_sub_dev->se_dev_attrib.max_sectors)) {
015487b8
RD		 3185 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too big sectors %u\n",
3186 cdb[0], sectors);
3187 goto out_invalid_cdb_field;
3188 }
3189
5bda90c8 3190 /* reject any command that we don't have a handler for */
6bb35e00 3191 if (!(passthrough || cmd->execute_cmd ||
5bda90c8
CH		 3192 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3193 goto out_unsupported_cdb;
3194
c66ac9db
NB		 3195 transport_set_supported_SAM_opcode(cmd);
3196 return ret;
3197
3198out_unsupported_cdb:
3199 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3200 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3201 return -EINVAL;
c66ac9db
NB		 3202out_invalid_cdb_field:
3203 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3204 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3205 return -EINVAL;
c66ac9db
NB		 3206}
3207
c66ac9db 3208/*
35e0e757 3209 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3210 * and ordered cmds need to have their tasks added to the execution queue.
3211 */
3212static void transport_complete_task_attr(struct se_cmd *cmd)
3213{
5951146d 3214 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3215 struct se_cmd *cmd_p, *cmd_tmp;
3216 int new_active_tasks = 0;
3217
e66ecd50 3218 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3219 atomic_dec(&dev->simple_cmds);
3220 smp_mb__after_atomic_dec();
3221 dev->dev_cur_ordered_id++;
6708bb27 3222 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3223 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3224 cmd->se_ordered_id);
e66ecd50 3225 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3226 dev->dev_cur_ordered_id++;
6708bb27 3227 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3228 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3229 cmd->se_ordered_id);
e66ecd50 3230 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3231 atomic_dec(&dev->dev_ordered_sync);
3232 smp_mb__after_atomic_dec();
c66ac9db
NB		 3233
3234 dev->dev_cur_ordered_id++;
6708bb27 3235 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3236 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3237 }
3238 /*
3239 * Process all commands up to the last received
3240 * ORDERED task attribute which requires another blocking
3241 * boundary
3242 */
3243 spin_lock(&dev->delayed_cmd_lock);
3244 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3245 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3246
5951146d 3247 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3248 spin_unlock(&dev->delayed_cmd_lock);
3249
6708bb27 3250 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3251 " cmd_p: 0x%02x Task Attr: 0x%02x"
3252 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3253 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3254 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3255
3256 transport_add_tasks_from_cmd(cmd_p);
3257 new_active_tasks++;
3258
3259 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3260 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3261 break;
3262 }
3263 spin_unlock(&dev->delayed_cmd_lock);
3264 /*
3265 * If new tasks have become active, wake up the transport thread
3266 * to do the processing of the Active tasks.
3267 */
3268 if (new_active_tasks != 0)
e3d6f909 3269 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3270}
3271
e057f533 3272static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3273{
3274 int ret = 0;
3275
e057f533
CH		 3276 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3277 transport_complete_task_attr(cmd);
3278
3279 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3280 ret = cmd->se_tfo->queue_status(cmd);
3281 if (ret)
3282 goto out;
3283 }
07bde79a
NB		 3284
3285 switch (cmd->data_direction) {
3286 case DMA_FROM_DEVICE:
3287 ret = cmd->se_tfo->queue_data_in(cmd);
3288 break;
3289 case DMA_TO_DEVICE:
ec98f782 3290 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3291 ret = cmd->se_tfo->queue_data_in(cmd);
3292 if (ret < 0)
e057f533 3293 break;
07bde79a
NB		 3294 }
3295 /* Fall through for DMA_TO_DEVICE */
3296 case DMA_NONE:
3297 ret = cmd->se_tfo->queue_status(cmd);
3298 break;
3299 default:
3300 break;
3301 }
3302
e057f533
CH		 3303out:
3304 if (ret < 0) {
3305 transport_handle_queue_full(cmd, cmd->se_dev);
3306 return;
3307 }
3308 transport_lun_remove_cmd(cmd);
3309 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3310}
3311
3312static void transport_handle_queue_full(
3313 struct se_cmd *cmd,
e057f533 3314 struct se_device *dev)
07bde79a
NB		 3315{
3316 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3317 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3318 atomic_inc(&dev->dev_qf_count);
3319 smp_mb__after_atomic_inc();
3320 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3321
3322 schedule_work(&cmd->se_dev->qf_work_queue);
3323}
3324
35e0e757 3325static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3326{
35e0e757 3327 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3328 int reason = 0, ret;
35e0e757 3329
c66ac9db
NB		 3330 /*
3331 * Check if we need to move delayed/dormant tasks from cmds on the
3332 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3333 * Attribute.
3334 */
5951146d 3335 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3336 transport_complete_task_attr(cmd);
07bde79a
NB		 3337 /*
3338 * Check to schedule QUEUE_FULL work, or execute an existing
3339 * cmd->transport_qf_callback()
3340 */
3341 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3342 schedule_work(&cmd->se_dev->qf_work_queue);
3343
c66ac9db
NB		 3344 /*
3345 * Check if we need to retrieve a sense buffer from
3346 * the struct se_cmd in question.
3347 */
3348 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3349 if (transport_get_sense_data(cmd) < 0)
3350 reason = TCM_NON_EXISTENT_LUN;
3351
3352 /*
3353 * Only set when an struct se_task->task_scsi_status returned
3354 * a non GOOD status.
3355 */
3356 if (cmd->scsi_status) {
07bde79a 3357 ret = transport_send_check_condition_and_sense(
c66ac9db 3358 cmd, reason, 1);
f147abb4 3359 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3360 goto queue_full;
3361
c66ac9db
NB		 3362 transport_lun_remove_cmd(cmd);
3363 transport_cmd_check_stop_to_fabric(cmd);
3364 return;
3365 }
3366 }
3367 /*
25985edc 3368 * Check for a callback, used by amongst other things
c66ac9db
NB		 3369 * XDWRITE_READ_10 emulation.
3370 */
3371 if (cmd->transport_complete_callback)
3372 cmd->transport_complete_callback(cmd);
3373
3374 switch (cmd->data_direction) {
3375 case DMA_FROM_DEVICE:
3376 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3377 if (cmd->se_lun->lun_sep) {
3378 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3379 cmd->data_length;
3380 }
3381 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3382
07bde79a 3383 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3384 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3385 goto queue_full;
c66ac9db
NB		 3386 break;
3387 case DMA_TO_DEVICE:
3388 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3389 if (cmd->se_lun->lun_sep) {
3390 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3391 cmd->data_length;
3392 }
3393 spin_unlock(&cmd->se_lun->lun_sep_lock);
3394 /*
3395 * Check if we need to send READ payload for BIDI-COMMAND
3396 */
ec98f782 3397 if (cmd->t_bidi_data_sg) {
c66ac9db 3398 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3399 if (cmd->se_lun->lun_sep) {
3400 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3401 cmd->data_length;
3402 }
3403 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3404 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3405 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3406 goto queue_full;
c66ac9db
NB		 3407 break;
3408 }
3409 /* Fall through for DMA_TO_DEVICE */
3410 case DMA_NONE:
07bde79a 3411 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3412 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3413 goto queue_full;
c66ac9db
NB		 3414 break;
3415 default:
3416 break;
3417 }
3418
3419 transport_lun_remove_cmd(cmd);
3420 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3421 return;
3422
3423queue_full:
6708bb27 3424 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3425 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3426 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3427 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3428}
3429
3430static void transport_free_dev_tasks(struct se_cmd *cmd)
3431{
3432 struct se_task *task, *task_tmp;
3433 unsigned long flags;
0c2cfe5f 3434 LIST_HEAD(dispose_list);
c66ac9db 3435
a1d8b49a 3436 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3437 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3438 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3439 if (!(task->task_flags & TF_ACTIVE))
3440 list_move_tail(&task->t_list, &dispose_list);
3441 }
3442 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3443
3444 while (!list_empty(&dispose_list)) {
3445 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3446
c66ac9db 3447 list_del(&task->t_list);
42bf829e 3448 cmd->se_dev->transport->free_task(task);
c66ac9db 3449 }
c66ac9db
NB		 3450}
3451
6708bb27 3452static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3453{
ec98f782 3454 struct scatterlist *sg;
ec98f782 3455 int count;
c66ac9db 3456
6708bb27
AG		 3457 for_each_sg(sgl, sg, nents, count)
3458 __free_page(sg_page(sg));
c66ac9db 3459
6708bb27
AG		 3460 kfree(sgl);
3461}
c66ac9db 3462
6708bb27
AG		 3463static inline void transport_free_pages(struct se_cmd *cmd)
3464{
3465 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3466 return;
3467
3468 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3469 cmd->t_data_sg = NULL;
3470 cmd->t_data_nents = 0;
c66ac9db 3471
6708bb27 3472 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3473 cmd->t_bidi_data_sg = NULL;
3474 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3475}
3476
e26d99ae
CH		 3477/**
3478 * transport_release_cmd - free a command
3479 * @cmd: command to free
3480 *
3481 * This routine unconditionally frees a command, and reference counting
3482 * or list removal must be done in the caller.
3483 */
3484static void transport_release_cmd(struct se_cmd *cmd)
3485{
3486 BUG_ON(!cmd->se_tfo);
3487
c8e31f26 3488 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 3489 core_tmr_release_req(cmd->se_tmr_req);
3490 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3491 kfree(cmd->t_task_cdb);
3492 /*
7481deb4
NB		 3493 * If this cmd has been setup with target_get_sess_cmd(), drop
3494 * the kref and call ->release_cmd() in kref callback.
e26d99ae 3495 */
7481deb4
NB		 3496 if (cmd->check_release != 0) {
3497 target_put_sess_cmd(cmd->se_sess, cmd);
3498 return;
3499 }
e26d99ae
CH		 3500 cmd->se_tfo->release_cmd(cmd);
3501}
3502
d3df7825
CH		 3503/**
3504 * transport_put_cmd - release a reference to a command
3505 * @cmd: command to release
3506 *
3507 * This routine releases our reference to the command and frees it if possible.
3508 */
39c05f32 3509static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3510{
3511 unsigned long flags;
4911e3cc 3512 int free_tasks = 0;
c66ac9db 3513
a1d8b49a 3514 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3515 if (atomic_read(&cmd->t_fe_count)) {
3516 if (!atomic_dec_and_test(&cmd->t_fe_count))
3517 goto out_busy;
3518 }
3519
3520 if (atomic_read(&cmd->t_se_count)) {
3521 if (!atomic_dec_and_test(&cmd->t_se_count))
3522 goto out_busy;
3523 }
3524
7d680f3b
CH		 3525 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3526 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
4911e3cc
CH		 3527 transport_all_task_dev_remove_state(cmd);
3528 free_tasks = 1;
c66ac9db 3529 }
a1d8b49a 3530 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3531
4911e3cc
CH		 3532 if (free_tasks != 0)
3533 transport_free_dev_tasks(cmd);
d3df7825 3534
c66ac9db 3535 transport_free_pages(cmd);
31afc39c 3536 transport_release_cmd(cmd);
39c05f32 3537 return;
4911e3cc
CH		 3538out_busy:
3539 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3540}
3541
c66ac9db 3542/*
ec98f782
AG		 3543 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3544 * allocating in the core.
c66ac9db
NB		 3545 * @cmd: Associated se_cmd descriptor
3546 * @mem: SGL style memory for TCM WRITE / READ
3547 * @sg_mem_num: Number of SGL elements
3548 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3549 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3550 *
3551 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3552 * of parameters.
3553 */
3554int transport_generic_map_mem_to_cmd(
3555 struct se_cmd *cmd,
5951146d
AG		 3556 struct scatterlist *sgl,
3557 u32 sgl_count,
3558 struct scatterlist *sgl_bidi,
3559 u32 sgl_bidi_count)
c66ac9db 3560{
5951146d 3561 if (!sgl || !sgl_count)
c66ac9db 3562 return 0;
c66ac9db 3563
c66ac9db
NB		 3564 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3565 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
fef58a60
NB		 3566 /*
3567 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3568 * scatterlists already have been set to follow what the fabric
3569 * passes for the original expected data transfer length.
3570 */
3571 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3572 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3573 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3574 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3575 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3576 return -EINVAL;
3577 }
c66ac9db 3578
ec98f782
AG		 3579 cmd->t_data_sg = sgl;
3580 cmd->t_data_nents = sgl_count;
c66ac9db 3581
ec98f782
AG		 3582 if (sgl_bidi && sgl_bidi_count) {
3583 cmd->t_bidi_data_sg = sgl_bidi;
3584 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3585 }
3586 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3587 }
3588
3589 return 0;
3590}
3591EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3592
4949314c 3593void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3594{
ec98f782 3595 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 3596 struct page **pages;
3597 int i;
05d1c7c0 3598
ec98f782 3599 BUG_ON(!sg);
05d1c7c0 3600 /*
ec98f782
AG		 3601 * We need to take into account a possible offset here for fabrics like
3602 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3603 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3604 */
4949314c
AG		 3605 if (!cmd->t_data_nents)
3606 return NULL;
3607 else if (cmd->t_data_nents == 1)
3608 return kmap(sg_page(sg)) + sg->offset;
3609
3610 /* >1 page. use vmap */
3611 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3612 if (!pages)
3613 return NULL;
3614
3615 /* convert sg[] to pages[] */
3616 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3617 pages[i] = sg_page(sg);
3618 }
3619
3620 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
3621 kfree(pages);
3622 if (!cmd->t_data_vmap)
3623 return NULL;
3624
3625 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 3626}
4949314c 3627EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 3628
4949314c 3629void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3630{
a1edf9cf 3631 if (!cmd->t_data_nents) {
4949314c 3632 return;
a1edf9cf 3633 } else if (cmd->t_data_nents == 1) {
4949314c 3634 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 3635 return;
3636 }
4949314c
AG		 3637
3638 vunmap(cmd->t_data_vmap);
3639 cmd->t_data_vmap = NULL;
05d1c7c0 3640}
4949314c 3641EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 3642
c66ac9db 3643static int
05d1c7c0 3644transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3645{
ec98f782
AG		 3646 u32 length = cmd->data_length;
3647 unsigned int nents;
3648 struct page *page;
9db9da33 3649 gfp_t zero_flag;
ec98f782 3650 int i = 0;
c66ac9db 3651
ec98f782
AG		 3652 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3653 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3654 if (!cmd->t_data_sg)
3655 return -ENOMEM;
c66ac9db 3656
ec98f782
AG		 3657 cmd->t_data_nents = nents;
3658 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3659
9db9da33 3660 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3661
ec98f782
AG		 3662 while (length) {
3663 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 3664 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 3665 if (!page)
3666 goto out;
c66ac9db 3667
ec98f782
AG		 3668 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3669 length -= page_len;
3670 i++;
c66ac9db 3671 }
c66ac9db 3672 return 0;
c66ac9db 3673
ec98f782
AG		 3674out:
3675 while (i >= 0) {
3676 __free_page(sg_page(&cmd->t_data_sg[i]));
3677 i--;
c66ac9db 3678 }
ec98f782
AG		 3679 kfree(cmd->t_data_sg);
3680 cmd->t_data_sg = NULL;
3681 return -ENOMEM;
c66ac9db
NB		 3682}
3683
da0f7619 3684/*
b16a35b0
AG		 3685 * Allocate any required resources to execute the command. For writes we
3686 * might not have the payload yet, so notify the fabric via a call to
3687 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 3688 */
a1d8b49a 3689int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3690{
da0f7619 3691 struct se_device *dev = cmd->se_dev;
4101f0a8
CH		 3692 struct se_task *task;
3693 unsigned long flags;
c66ac9db
NB		 3694 int ret = 0;
3695
3696 /*
3697 * Determine is the TCM fabric module has already allocated physical
3698 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3699 * beforehand.
c66ac9db 3700 */
ec98f782
AG		 3701 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3702 cmd->data_length) {
05d1c7c0 3703 ret = transport_generic_get_mem(cmd);
c66ac9db 3704 if (ret < 0)
03e98c9e 3705 goto out_fail;
c66ac9db 3706 }
da0f7619 3707
4101f0a8
CH		 3708 /* Workaround for handling zero-length control CDBs */
3709 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3710 !cmd->data_length) {
7d680f3b 3711 spin_lock_irq(&cmd->t_state_lock);
410f6702 3712 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 3713 cmd->transport_state |= CMD_T_ACTIVE;
3714 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 3715
3716 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3717 u8 ua_asc = 0, ua_ascq = 0;
3718
3719 core_scsi3_ua_clear_for_request_sense(cmd,
3720 &ua_asc, &ua_ascq);
3721 }
3722
410f6702
RD		 3723 INIT_WORK(&cmd->work, target_complete_ok_work);
3724 queue_work(target_completion_wq, &cmd->work);
3725 return 0;
3726 }
da0f7619 3727
4101f0a8
CH		 3728 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3729 struct se_dev_attrib *attr = &dev->se_sub_dev->se_dev_attrib;
3730
3731 if (transport_cmd_get_valid_sectors(cmd) < 0)
3732 return -EINVAL;
3733
3734 BUG_ON(cmd->data_length % attr->block_size);
3735 BUG_ON(DIV_ROUND_UP(cmd->data_length, attr->block_size) >
3736 attr->max_sectors);
da0f7619
CH		 3737 }
3738
4101f0a8
CH		 3739 task = dev->transport->alloc_task(cmd->t_task_cdb);
3740 if (!task) {
3741 pr_err("Unable to allocate struct se_task\n");
3742 goto out_fail;
3743 }
3744
3745 INIT_LIST_HEAD(&task->t_list);
3746 INIT_LIST_HEAD(&task->t_execute_list);
3747 INIT_LIST_HEAD(&task->t_state_list);
3748 init_completion(&task->task_stop_comp);
3749 task->task_se_cmd = cmd;
3750 task->task_data_direction = cmd->data_direction;
3751 task->task_sg = cmd->t_data_sg;
3752 task->task_sg_nents = cmd->t_data_nents;
3753
3754 spin_lock_irqsave(&cmd->t_state_lock, flags);
3755 list_add_tail(&task->t_list, &cmd->t_task_list);
3756 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3757
3758 atomic_inc(&cmd->t_fe_count);
3759 atomic_inc(&cmd->t_se_count);
3760
3761 cmd->t_task_list_num = 1;
9ac54987
NB		 3762 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3763 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3764
c66ac9db 3765 /*
a1d8b49a 3766 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3767 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3768 * will be added to the struct se_device execution queue after its WRITE
3769 * data has arrived. (ie: It gets handled by the transport processing
3770 * thread a second time)
3771 */
3772 if (cmd->data_direction == DMA_TO_DEVICE) {
3773 transport_add_tasks_to_state_queue(cmd);
3774 return transport_generic_write_pending(cmd);
3775 }
3776 /*
3777 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3778 * to the execution queue.
3779 */
3780 transport_execute_tasks(cmd);
3781 return 0;
da0f7619
CH		 3782
3783out_fail:
3784 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3785 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3786 return -EINVAL;
c66ac9db 3787}
a1d8b49a 3788EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3789
3790/* transport_generic_process_write():
3791 *
3792 *
3793 */
3794void transport_generic_process_write(struct se_cmd *cmd)
3795{
c66ac9db
NB		 3796 transport_execute_tasks(cmd);
3797}
3798EXPORT_SYMBOL(transport_generic_process_write);
3799
e057f533 3800static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3801{
f147abb4
NB		 3802 int ret;
3803
3804 ret = cmd->se_tfo->write_pending(cmd);
3805 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3806 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3807 cmd);
3808 transport_handle_queue_full(cmd, cmd->se_dev);
3809 }
07bde79a
NB		 3810}
3811
c66ac9db
NB		 3812static int transport_generic_write_pending(struct se_cmd *cmd)
3813{
3814 unsigned long flags;
3815 int ret;
3816
a1d8b49a 3817 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3818 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3819 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3820
c66ac9db
NB		 3821 /*
3822 * Clear the se_cmd for WRITE_PENDING status in order to set
7d680f3b
CH		 3823 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3824 * from HW target mode interrupt code. This is safe to be called
3825 * with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3826 * because the se_cmd->se_lun pointer is not being cleared.
3827 */
3828 transport_cmd_check_stop(cmd, 1, 0);
3829
3830 /*
3831 * Call the fabric write_pending function here to let the
3832 * frontend know that WRITE buffers are ready.
3833 */
e3d6f909 3834 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3835 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3836 goto queue_full;
3837 else if (ret < 0)
c66ac9db
NB		 3838 return ret;
3839
03e98c9e 3840 return 1;
07bde79a
NB		 3841
3842queue_full:
6708bb27 3843 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3844 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3845 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3846 return 0;
c66ac9db
NB		 3847}
3848
39c05f32 3849void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3850{
d14921d6 3851 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 3852 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 3853 transport_wait_for_tasks(cmd);
3854
35462975 3855 transport_release_cmd(cmd);
d14921d6
NB		 3856 } else {
3857 if (wait_for_tasks)
3858 transport_wait_for_tasks(cmd);
3859
c66ac9db
NB		 3860 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3861
82f1c8a4 3862 if (cmd->se_lun)
c66ac9db 3863 transport_lun_remove_cmd(cmd);
c66ac9db 3864
f4366772
NB		 3865 transport_free_dev_tasks(cmd);
3866
39c05f32 3867 transport_put_cmd(cmd);
c66ac9db
NB		 3868 }
3869}
3870EXPORT_SYMBOL(transport_generic_free_cmd);
3871
a17f091d
NB		 3872/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3873 * @se_sess: session to reference
3874 * @se_cmd: command descriptor to add
a6360785 3875 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 3876 */
a6360785
NB		 3877void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3878 bool ack_kref)
a17f091d
NB		 3879{
3880 unsigned long flags;
3881
7481deb4 3882 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 3883 /*
3884 * Add a second kref if the fabric caller is expecting to handle
3885 * fabric acknowledgement that requires two target_put_sess_cmd()
3886 * invocations before se_cmd descriptor release.
3887 */
86715569 3888 if (ack_kref == true) {
a6360785 3889 kref_get(&se_cmd->cmd_kref);
86715569
NB		 3890 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
3891 }
7481deb4 3892
a17f091d
NB		 3893 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3894 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3895 se_cmd->check_release = 1;
3896 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3897}
3898EXPORT_SYMBOL(target_get_sess_cmd);
3899
7481deb4 3900static void target_release_cmd_kref(struct kref *kref)
a17f091d 3901{
7481deb4
NB		 3902 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3903 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 3904 unsigned long flags;
3905
3906 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3907 if (list_empty(&se_cmd->se_cmd_list)) {
3908 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 3909 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 3910 return;
a17f091d 3911 }
a17f091d
NB		 3912 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3913 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3914 complete(&se_cmd->cmd_wait_comp);
7481deb4 3915 return;
a17f091d
NB		 3916 }
3917 list_del(&se_cmd->se_cmd_list);
3918 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3919
7481deb4
NB		 3920 se_cmd->se_tfo->release_cmd(se_cmd);
3921}
3922
3923/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
3924 * @se_sess: session to reference
3925 * @se_cmd: command descriptor to drop
3926 */
3927int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3928{
3929 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 3930}
3931EXPORT_SYMBOL(target_put_sess_cmd);
3932
3933/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3934 * @se_sess: session to split
3935 */
3936void target_splice_sess_cmd_list(struct se_session *se_sess)
3937{
3938 struct se_cmd *se_cmd;
3939 unsigned long flags;
3940
3941 WARN_ON(!list_empty(&se_sess->sess_wait_list));
3942 INIT_LIST_HEAD(&se_sess->sess_wait_list);
3943
3944 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3945 se_sess->sess_tearing_down = 1;
3946
3947 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3948
3949 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3950 se_cmd->cmd_wait_set = 1;
3951
3952 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3953}
3954EXPORT_SYMBOL(target_splice_sess_cmd_list);
3955
3956/* target_wait_for_sess_cmds - Wait for outstanding descriptors
3957 * @se_sess: session to wait for active I/O
3958 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3959 */
3960void target_wait_for_sess_cmds(
3961 struct se_session *se_sess,
3962 int wait_for_tasks)
3963{
3964 struct se_cmd *se_cmd, *tmp_cmd;
3965 bool rc = false;
3966
3967 list_for_each_entry_safe(se_cmd, tmp_cmd,
3968 &se_sess->sess_wait_list, se_cmd_list) {
3969 list_del(&se_cmd->se_cmd_list);
3970
3971 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3972 " %d\n", se_cmd, se_cmd->t_state,
3973 se_cmd->se_tfo->get_cmd_state(se_cmd));
3974
3975 if (wait_for_tasks) {
3976 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3977 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3978 se_cmd->se_tfo->get_cmd_state(se_cmd));
3979
3980 rc = transport_wait_for_tasks(se_cmd);
3981
3982 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3983 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3984 se_cmd->se_tfo->get_cmd_state(se_cmd));
3985 }
3986
3987 if (!rc) {
3988 wait_for_completion(&se_cmd->cmd_wait_comp);
3989 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
3990 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3991 se_cmd->se_tfo->get_cmd_state(se_cmd));
3992 }
3993
3994 se_cmd->se_tfo->release_cmd(se_cmd);
3995 }
3996}
3997EXPORT_SYMBOL(target_wait_for_sess_cmds);
3998
c66ac9db
NB		 3999/* transport_lun_wait_for_tasks():
4000 *
4001 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4002 * an struct se_lun to be successfully shutdown.
4003 */
4004static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4005{
4006 unsigned long flags;
4007 int ret;
4008 /*
4009 * If the frontend has already requested this struct se_cmd to
4010 * be stopped, we can safely ignore this struct se_cmd.
4011 */
a1d8b49a 4012 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 4013 if (cmd->transport_state & CMD_T_STOP) {
4014 cmd->transport_state &= ~CMD_T_LUN_STOP;
4015
4016 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
4017 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4018 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4019 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4020 return -EPERM;
c66ac9db 4021 }
7d680f3b 4022 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 4023 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4024
5951146d 4025 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4026
4027 ret = transport_stop_tasks_for_cmd(cmd);
4028
6708bb27
AG		 4029 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4030 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4031 if (!ret) {
6708bb27 4032 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4033 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4034 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4035 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4036 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4037 }
3df8d40b 4038 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4039
4040 return 0;
4041}
4042
c66ac9db
NB		 4043static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4044{
4045 struct se_cmd *cmd = NULL;
4046 unsigned long lun_flags, cmd_flags;
4047 /*
4048 * Do exception processing and return CHECK_CONDITION status to the
4049 * Initiator Port.
4050 */
4051 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4052 while (!list_empty(&lun->lun_cmd_list)) {
4053 cmd = list_first_entry(&lun->lun_cmd_list,
4054 struct se_cmd, se_lun_node);
3d26fea0 4055 list_del_init(&cmd->se_lun_node);
5951146d 4056
c66ac9db
NB		 4057 /*
4058 * This will notify iscsi_target_transport.c:
4059 * transport_cmd_check_stop() that a LUN shutdown is in
4060 * progress for the iscsi_cmd_t.
4061 */
a1d8b49a 4062 spin_lock(&cmd->t_state_lock);
6708bb27 4063 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4064 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4065 cmd->se_lun->unpacked_lun,
4066 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 4067 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 4068 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4069
4070 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4071
6708bb27
AG		 4072 if (!cmd->se_lun) {
4073 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4074 cmd->se_tfo->get_task_tag(cmd),
4075 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4076 BUG();
4077 }
4078 /*
4079 * If the Storage engine still owns the iscsi_cmd_t, determine
4080 * and/or stop its context.
4081 */
6708bb27 4082 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4083 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4084 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4085
e3d6f909 4086 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4087 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4088 continue;
4089 }
4090
6708bb27 4091 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4092 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4093 cmd->se_lun->unpacked_lun,
4094 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4095
a1d8b49a 4096 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 4097 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 4098 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4099 goto check_cond;
4100 }
7d680f3b 4101 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
c66ac9db 4102 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4103 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4104
4105 transport_free_dev_tasks(cmd);
4106 /*
4107 * The Storage engine stopped this struct se_cmd before it was
4108 * send to the fabric frontend for delivery back to the
4109 * Initiator Node. Return this SCSI CDB back with an
4110 * CHECK_CONDITION status.
4111 */
4112check_cond:
4113 transport_send_check_condition_and_sense(cmd,
4114 TCM_NON_EXISTENT_LUN, 0);
4115 /*
4116 * If the fabric frontend is waiting for this iscsi_cmd_t to
4117 * be released, notify the waiting thread now that LU has
4118 * finished accessing it.
4119 */
a1d8b49a 4120 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 4121 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 4122 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4123 " struct se_cmd: %p ITT: 0x%08x\n",
4124 lun->unpacked_lun,
e3d6f909 4125 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4126
a1d8b49a 4127 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4128 cmd_flags);
4129 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4130 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4131 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4132 continue;
4133 }
6708bb27 4134 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4135 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4136
a1d8b49a 4137 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4138 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4139 }
4140 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4141}
4142
4143static int transport_clear_lun_thread(void *p)
4144{
8359cf43 4145 struct se_lun *lun = p;
c66ac9db
NB		 4146
4147 __transport_clear_lun_from_sessions(lun);
4148 complete(&lun->lun_shutdown_comp);
4149
4150 return 0;
4151}
4152
4153int transport_clear_lun_from_sessions(struct se_lun *lun)
4154{
4155 struct task_struct *kt;
4156
5951146d 4157 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4158 "tcm_cl_%u", lun->unpacked_lun);
4159 if (IS_ERR(kt)) {
6708bb27 4160 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4161 return PTR_ERR(kt);
c66ac9db
NB		 4162 }
4163 wait_for_completion(&lun->lun_shutdown_comp);
4164
4165 return 0;
4166}
4167
d14921d6
NB		 4168/**
4169 * transport_wait_for_tasks - wait for completion to occur
4170 * @cmd: command to wait
c66ac9db 4171 *
d14921d6
NB		 4172 * Called from frontend fabric context to wait for storage engine
4173 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4174 */
a17f091d 4175bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4176{
4177 unsigned long flags;
4178
a1d8b49a 4179 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 4180 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
4181 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 4182 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4183 return false;
d14921d6
NB		 4184 }
4185 /*
4186 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4187 * has been set in transport_set_supported_SAM_opcode().
4188 */
c8e31f26
AG		 4189 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
4190 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 4191 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4192 return false;
d14921d6 4193 }
c66ac9db
NB		 4194 /*
4195 * If we are already stopped due to an external event (ie: LUN shutdown)
4196 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4197 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4198 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4199 * has completed its operation on the struct se_cmd.
4200 */
7d680f3b 4201 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 4202 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4203 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4204 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4205 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4206 /*
4207 * There is a special case for WRITES where a FE exception +
4208 * LUN shutdown means ConfigFS context is still sleeping on
4209 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4210 * We go ahead and up transport_lun_stop_comp just to be sure
4211 * here.
4212 */
a1d8b49a
AG		 4213 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4214 complete(&cmd->transport_lun_stop_comp);
4215 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4216 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4217
4218 transport_all_task_dev_remove_state(cmd);
4219 /*
4220 * At this point, the frontend who was the originator of this
4221 * struct se_cmd, now owns the structure and can be released through
4222 * normal means below.
4223 */
6708bb27 4224 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4225 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4226 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4227 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4228
7d680f3b 4229 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 4230 }
7d680f3b 4231
3d28934a 4232 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 4233 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4234 return false;
d14921d6 4235 }
c66ac9db 4236
7d680f3b 4237 cmd->transport_state |= CMD_T_STOP;
c66ac9db 4238
6708bb27 4239 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 4240 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 4241 cmd, cmd->se_tfo->get_task_tag(cmd),
4242 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4243
a1d8b49a 4244 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4245
5951146d 4246 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4247
a1d8b49a 4248 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4249
a1d8b49a 4250 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 4251 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 4252
6708bb27 4253 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4254 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4255 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4256
d14921d6 4257 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4258
4259 return true;
c66ac9db 4260}
d14921d6 4261EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4262
4263static int transport_get_sense_codes(
4264 struct se_cmd *cmd,
4265 u8 *asc,
4266 u8 *ascq)
4267{
4268 *asc = cmd->scsi_asc;
4269 *ascq = cmd->scsi_ascq;
4270
4271 return 0;
4272}
4273
4274static int transport_set_sense_codes(
4275 struct se_cmd *cmd,
4276 u8 asc,
4277 u8 ascq)
4278{
4279 cmd->scsi_asc = asc;
4280 cmd->scsi_ascq = ascq;
4281
4282 return 0;
4283}
4284
4285int transport_send_check_condition_and_sense(
4286 struct se_cmd *cmd,
4287 u8 reason,
4288 int from_transport)
4289{
4290 unsigned char *buffer = cmd->sense_buffer;
4291 unsigned long flags;
4292 int offset;
4293 u8 asc = 0, ascq = 0;
4294
a1d8b49a 4295 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4296 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4297 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4298 return 0;
4299 }
4300 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4301 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4302
4303 if (!reason && from_transport)
4304 goto after_reason;
4305
4306 if (!from_transport)
4307 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4308 /*
4309 * Data Segment and SenseLength of the fabric response PDU.
4310 *
4311 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4312 * from include/scsi/scsi_cmnd.h
4313 */
e3d6f909 4314 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4315 TRANSPORT_SENSE_BUFFER);
4316 /*
4317 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4318 * SENSE KEY values from include/scsi/scsi.h
4319 */
4320 switch (reason) {
4321 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4322 /* CURRENT ERROR */
4323 buffer[offset] = 0x70;
895f3022 4324 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 4325 /* ILLEGAL REQUEST */
4326 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4327 /* LOGICAL UNIT NOT SUPPORTED */
4328 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4329 break;
c66ac9db
NB		 4330 case TCM_UNSUPPORTED_SCSI_OPCODE:
4331 case TCM_SECTOR_COUNT_TOO_MANY:
4332 /* CURRENT ERROR */
4333 buffer[offset] = 0x70;
895f3022 4334 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4335 /* ILLEGAL REQUEST */
4336 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4337 /* INVALID COMMAND OPERATION CODE */
4338 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4339 break;
4340 case TCM_UNKNOWN_MODE_PAGE:
4341 /* CURRENT ERROR */
4342 buffer[offset] = 0x70;
895f3022 4343 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4344 /* ILLEGAL REQUEST */
4345 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4346 /* INVALID FIELD IN CDB */
4347 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4348 break;
4349 case TCM_CHECK_CONDITION_ABORT_CMD:
4350 /* CURRENT ERROR */
4351 buffer[offset] = 0x70;
895f3022 4352 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4353 /* ABORTED COMMAND */
4354 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4355 /* BUS DEVICE RESET FUNCTION OCCURRED */
4356 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4357 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4358 break;
4359 case TCM_INCORRECT_AMOUNT_OF_DATA:
4360 /* CURRENT ERROR */
4361 buffer[offset] = 0x70;
895f3022 4362 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4363 /* ABORTED COMMAND */
4364 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4365 /* WRITE ERROR */
4366 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4367 /* NOT ENOUGH UNSOLICITED DATA */
4368 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4369 break;
4370 case TCM_INVALID_CDB_FIELD:
4371 /* CURRENT ERROR */
4372 buffer[offset] = 0x70;
895f3022 4373 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4374 /* ILLEGAL REQUEST */
4375 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4376 /* INVALID FIELD IN CDB */
4377 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4378 break;
4379 case TCM_INVALID_PARAMETER_LIST:
4380 /* CURRENT ERROR */
4381 buffer[offset] = 0x70;
895f3022 4382 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4383 /* ILLEGAL REQUEST */
4384 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4385 /* INVALID FIELD IN PARAMETER LIST */
4386 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4387 break;
4388 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4389 /* CURRENT ERROR */
4390 buffer[offset] = 0x70;
895f3022 4391 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4392 /* ABORTED COMMAND */
4393 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4394 /* WRITE ERROR */
4395 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4396 /* UNEXPECTED_UNSOLICITED_DATA */
4397 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4398 break;
4399 case TCM_SERVICE_CRC_ERROR:
4400 /* CURRENT ERROR */
4401 buffer[offset] = 0x70;
895f3022 4402 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4403 /* ABORTED COMMAND */
4404 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4405 /* PROTOCOL SERVICE CRC ERROR */
4406 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4407 /* N/A */
4408 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4409 break;
4410 case TCM_SNACK_REJECTED:
4411 /* CURRENT ERROR */
4412 buffer[offset] = 0x70;
895f3022 4413 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4414 /* ABORTED COMMAND */
4415 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4416 /* READ ERROR */
4417 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4418 /* FAILED RETRANSMISSION REQUEST */
4419 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4420 break;
4421 case TCM_WRITE_PROTECTED:
4422 /* CURRENT ERROR */
4423 buffer[offset] = 0x70;
895f3022 4424 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4425 /* DATA PROTECT */
4426 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4427 /* WRITE PROTECTED */
4428 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4429 break;
4430 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4431 /* CURRENT ERROR */
4432 buffer[offset] = 0x70;
895f3022 4433 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4434 /* UNIT ATTENTION */
4435 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4436 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4437 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4438 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4439 break;
4440 case TCM_CHECK_CONDITION_NOT_READY:
4441 /* CURRENT ERROR */
4442 buffer[offset] = 0x70;
895f3022 4443 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4444 /* Not Ready */
4445 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4446 transport_get_sense_codes(cmd, &asc, &ascq);
4447 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4448 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4449 break;
4450 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4451 default:
4452 /* CURRENT ERROR */
4453 buffer[offset] = 0x70;
895f3022 4454 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4455 /* ILLEGAL REQUEST */
4456 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4457 /* LOGICAL UNIT COMMUNICATION FAILURE */
4458 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4459 break;
4460 }
4461 /*
4462 * This code uses linux/include/scsi/scsi.h SAM status codes!
4463 */
4464 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4465 /*
4466 * Automatically padded, this value is encoded in the fabric's
4467 * data_length response PDU containing the SCSI defined sense data.
4468 */
4469 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4470
4471after_reason:
07bde79a 4472 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4473}
4474EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4475
4476int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4477{
4478 int ret = 0;
4479
7d680f3b 4480 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 4481 if (!send_status ||
c66ac9db
NB		 4482 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4483 return 1;
8b1e1244 4484
6708bb27 4485 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4486 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4487 cmd->t_task_cdb[0],
e3d6f909 4488 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 4489
c66ac9db 4490 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4491 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4492 ret = 1;
4493 }
4494 return ret;
4495}
4496EXPORT_SYMBOL(transport_check_aborted_status);
4497
4498void transport_send_task_abort(struct se_cmd *cmd)
4499{
c252f003
NB		 4500 unsigned long flags;
4501
4502 spin_lock_irqsave(&cmd->t_state_lock, flags);
4503 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4504 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4505 return;
4506 }
4507 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4508
c66ac9db
NB		 4509 /*
4510 * If there are still expected incoming fabric WRITEs, we wait
4511 * until until they have completed before sending a TASK_ABORTED
4512 * response. This response with TASK_ABORTED status will be
4513 * queued back to fabric module by transport_check_aborted_status().
4514 */
4515 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4516 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 4517 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 4518 smp_mb__after_atomic_inc();
c66ac9db
NB		 4519 }
4520 }
4521 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 4522
6708bb27 4523 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4524 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4525 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 4526
e3d6f909 4527 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4528}
4529
e26d99ae 4530static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4531{
5951146d 4532 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4533 struct se_tmr_req *tmr = cmd->se_tmr_req;
4534 int ret;
4535
4536 switch (tmr->function) {
5c6cd613 4537 case TMR_ABORT_TASK:
3d28934a 4538 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 4539 break;
5c6cd613
NB		 4540 case TMR_ABORT_TASK_SET:
4541 case TMR_CLEAR_ACA:
4542 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4543 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4544 break;
5c6cd613 4545 case TMR_LUN_RESET:
c66ac9db
NB		 4546 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4547 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4548 TMR_FUNCTION_REJECTED;
4549 break;
5c6cd613 4550 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4551 tmr->response = TMR_FUNCTION_REJECTED;
4552 break;
5c6cd613 4553 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4554 tmr->response = TMR_FUNCTION_REJECTED;
4555 break;
c66ac9db 4556 default:
6708bb27 4557 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4558 tmr->function);
4559 tmr->response = TMR_FUNCTION_REJECTED;
4560 break;
4561 }
4562
4563 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4564 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4565
b7b8bef7 4566 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4567 return 0;
4568}
4569
c66ac9db
NB		 4570/* transport_processing_thread():
4571 *
4572 *
4573 */
4574static int transport_processing_thread(void *param)
4575{
5951146d 4576 int ret;
c66ac9db 4577 struct se_cmd *cmd;
8359cf43 4578 struct se_device *dev = param;
c66ac9db 4579
c66ac9db 4580 while (!kthread_should_stop()) {
e3d6f909
AG		 4581 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4582 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4583 kthread_should_stop());
4584 if (ret < 0)
4585 goto out;
4586
c66ac9db 4587get_cmd:
5951146d
AG		 4588 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4589 if (!cmd)
c66ac9db
NB		 4590 continue;
4591
5951146d 4592 switch (cmd->t_state) {
680b73c5
CH		 4593 case TRANSPORT_NEW_CMD:
4594 BUG();
4595 break;
c66ac9db 4596 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4597 if (!cmd->se_tfo->new_cmd_map) {
4598 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4599 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4600 BUG();
4601 }
e3d6f909 4602 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4603 if (ret < 0) {
03e98c9e 4604 transport_generic_request_failure(cmd);
c66ac9db
NB		 4605 break;
4606 }
c66ac9db 4607 ret = transport_generic_new_cmd(cmd);
f147abb4 4608 if (ret < 0) {
03e98c9e
NB		 4609 transport_generic_request_failure(cmd);
4610 break;
c66ac9db
NB		 4611 }
4612 break;
4613 case TRANSPORT_PROCESS_WRITE:
4614 transport_generic_process_write(cmd);
4615 break;
c66ac9db
NB		 4616 case TRANSPORT_PROCESS_TMR:
4617 transport_generic_do_tmr(cmd);
4618 break;
07bde79a 4619 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4620 transport_write_pending_qf(cmd);
4621 break;
4622 case TRANSPORT_COMPLETE_QF_OK:
4623 transport_complete_qf(cmd);
07bde79a 4624 break;
c66ac9db 4625 default:
f2da9dbd
CH		 4626 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4627 "i_state: %d on SE LUN: %u\n",
4628 cmd->t_state,
e3d6f909
AG		 4629 cmd->se_tfo->get_task_tag(cmd),
4630 cmd->se_tfo->get_cmd_state(cmd),
4631 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4632 BUG();
4633 }
4634
4635 goto get_cmd;
4636 }
4637
4638out:
ce8762f6
NB		 4639 WARN_ON(!list_empty(&dev->state_task_list));
4640 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4641 dev->process_thread = NULL;
4642 return 0;
4643}
Linux kernel - Deliverables
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