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target/iscsi: Fold _decide_list_to_build into _build_pdu_and_seq_lists
[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
775/*
776 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
777 * struct se_task list are ready to be added to the active execution list
778 * struct se_device
779
780 * Called with se_dev_t->execute_task_lock called.
781 */
782static inline int transport_add_task_check_sam_attr(
783 struct se_task *task,
784 struct se_task *task_prev,
785 struct se_device *dev)
786{
787 /*
788 * No SAM Task attribute emulation enabled, add to tail of
789 * execution queue
790 */
791 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
792 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
793 return 0;
794 }
795 /*
796 * HEAD_OF_QUEUE attribute for received CDB, which means
797 * the first task that is associated with a struct se_cmd goes to
798 * head of the struct se_device->execute_task_list, and task_prev
799 * after that for each subsequent task
800 */
e66ecd50 801 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 802 list_add(&task->t_execute_list,
803 (task_prev != NULL) ?
804 &task_prev->t_execute_list :
805 &dev->execute_task_list);
806
6708bb27 807 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 808 " in execution queue\n",
6708bb27 809 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 810 return 1;
811 }
812 /*
813 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
814 * transitioned from Dermant -> Active state, and are added to the end
815 * of the struct se_device->execute_task_list
816 */
817 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
818 return 0;
819}
820
821/* __transport_add_task_to_execute_queue():
822 *
823 * Called with se_dev_t->execute_task_lock called.
824 */
825static void __transport_add_task_to_execute_queue(
826 struct se_task *task,
827 struct se_task *task_prev,
828 struct se_device *dev)
829{
830 int head_of_queue;
831
832 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
833 atomic_inc(&dev->execute_tasks);
834
1880807a 835 if (task->t_state_active)
c66ac9db
NB		 836 return;
837 /*
838 * Determine if this task needs to go to HEAD_OF_QUEUE for the
839 * state list as well. Running with SAM Task Attribute emulation
840 * will always return head_of_queue == 0 here
841 */
842 if (head_of_queue)
843 list_add(&task->t_state_list, (task_prev) ?
844 &task_prev->t_state_list :
845 &dev->state_task_list);
846 else
847 list_add_tail(&task->t_state_list, &dev->state_task_list);
848
1880807a 849 task->t_state_active = true;
c66ac9db 850
6708bb27 851 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 852 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 853 task, dev);
854}
855
856static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
857{
42bf829e 858 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 859 struct se_task *task;
860 unsigned long flags;
861
a1d8b49a
AG		 862 spin_lock_irqsave(&cmd->t_state_lock, flags);
863 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db 864 spin_lock(&dev->execute_task_lock);
1880807a
CH		 865 if (!task->t_state_active) {
866 list_add_tail(&task->t_state_list,
867 &dev->state_task_list);
868 task->t_state_active = true;
869
870 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
871 task->task_se_cmd->se_tfo->get_task_tag(
872 task->task_se_cmd), task, dev);
873 }
c66ac9db
NB		 874 spin_unlock(&dev->execute_task_lock);
875 }
a1d8b49a 876 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 877}
878
4d2300cc 879static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
c66ac9db 880{
5951146d 881 struct se_device *dev = cmd->se_dev;
c66ac9db 882 struct se_task *task, *task_prev = NULL;
c66ac9db 883
a1d8b49a 884 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 885 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 886 continue;
887 /*
888 * __transport_add_task_to_execute_queue() handles the
889 * SAM Task Attribute emulation if enabled
890 */
891 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 892 task_prev = task;
893 }
4d2300cc
NB		 894}
895
896static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
897{
898 unsigned long flags;
899 struct se_device *dev = cmd->se_dev;
900
901 spin_lock_irqsave(&dev->execute_task_lock, flags);
902 __transport_add_tasks_from_cmd(cmd);
c66ac9db 903 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 904}
905
04629b7b
CH		 906void __transport_remove_task_from_execute_queue(struct se_task *task,
907 struct se_device *dev)
908{
909 list_del_init(&task->t_execute_list);
910 atomic_dec(&dev->execute_tasks);
911}
912
e26d99ae 913static void transport_remove_task_from_execute_queue(
c66ac9db
NB		 914 struct se_task *task,
915 struct se_device *dev)
916{
917 unsigned long flags;
918
04629b7b 919 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 920 return;
af57c3ac 921
c66ac9db 922 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 923 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 924 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
925}
926
07bde79a 927/*
f147abb4 928 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 929 */
930
931static void target_qf_do_work(struct work_struct *work)
932{
933 struct se_device *dev = container_of(work, struct se_device,
934 qf_work_queue);
bcac364a 935 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 936 struct se_cmd *cmd, *cmd_tmp;
937
938 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 939 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
940 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 941
bcac364a 942 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 943 list_del(&cmd->se_qf_node);
944 atomic_dec(&dev->dev_qf_count);
945 smp_mb__after_atomic_dec();
07bde79a 946
6708bb27 947 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 948 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 949 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 950 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
951 : "UNKNOWN");
f7a5cc0b
CH		 952
953 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 954 }
07bde79a
NB		 955}
956
c66ac9db
NB		 957unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
958{
959 switch (cmd->data_direction) {
960 case DMA_NONE:
961 return "NONE";
962 case DMA_FROM_DEVICE:
963 return "READ";
964 case DMA_TO_DEVICE:
965 return "WRITE";
966 case DMA_BIDIRECTIONAL:
967 return "BIDI";
968 default:
969 break;
970 }
971
972 return "UNKNOWN";
973}
974
975void transport_dump_dev_state(
976 struct se_device *dev,
977 char *b,
978 int *bl)
979{
980 *bl += sprintf(b + *bl, "Status: ");
981 switch (dev->dev_status) {
982 case TRANSPORT_DEVICE_ACTIVATED:
983 *bl += sprintf(b + *bl, "ACTIVATED");
984 break;
985 case TRANSPORT_DEVICE_DEACTIVATED:
986 *bl += sprintf(b + *bl, "DEACTIVATED");
987 break;
988 case TRANSPORT_DEVICE_SHUTDOWN:
989 *bl += sprintf(b + *bl, "SHUTDOWN");
990 break;
991 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
992 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
993 *bl += sprintf(b + *bl, "OFFLINE");
994 break;
995 default:
996 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
997 break;
998 }
999
65586d51
NB		 1000 *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d",
1001 atomic_read(&dev->execute_tasks), dev->queue_depth);
c66ac9db 1002 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1003 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1004 *bl += sprintf(b + *bl, " ");
1005}
1006
c66ac9db
NB		 1007void transport_dump_vpd_proto_id(
1008 struct t10_vpd *vpd,
1009 unsigned char *p_buf,
1010 int p_buf_len)
1011{
1012 unsigned char buf[VPD_TMP_BUF_SIZE];
1013 int len;
1014
1015 memset(buf, 0, VPD_TMP_BUF_SIZE);
1016 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1017
1018 switch (vpd->protocol_identifier) {
1019 case 0x00:
1020 sprintf(buf+len, "Fibre Channel\n");
1021 break;
1022 case 0x10:
1023 sprintf(buf+len, "Parallel SCSI\n");
1024 break;
1025 case 0x20:
1026 sprintf(buf+len, "SSA\n");
1027 break;
1028 case 0x30:
1029 sprintf(buf+len, "IEEE 1394\n");
1030 break;
1031 case 0x40:
1032 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1033 " Protocol\n");
1034 break;
1035 case 0x50:
1036 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1037 break;
1038 case 0x60:
1039 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1040 break;
1041 case 0x70:
1042 sprintf(buf+len, "Automation/Drive Interface Transport"
1043 " Protocol\n");
1044 break;
1045 case 0x80:
1046 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1047 break;
1048 default:
1049 sprintf(buf+len, "Unknown 0x%02x\n",
1050 vpd->protocol_identifier);
1051 break;
1052 }
1053
1054 if (p_buf)
1055 strncpy(p_buf, buf, p_buf_len);
1056 else
6708bb27 1057 pr_debug("%s", buf);
c66ac9db
NB		 1058}
1059
1060void
1061transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1062{
1063 /*
1064 * Check if the Protocol Identifier Valid (PIV) bit is set..
1065 *
1066 * from spc3r23.pdf section 7.5.1
1067 */
1068 if (page_83[1] & 0x80) {
1069 vpd->protocol_identifier = (page_83[0] & 0xf0);
1070 vpd->protocol_identifier_set = 1;
1071 transport_dump_vpd_proto_id(vpd, NULL, 0);
1072 }
1073}
1074EXPORT_SYMBOL(transport_set_vpd_proto_id);
1075
1076int transport_dump_vpd_assoc(
1077 struct t10_vpd *vpd,
1078 unsigned char *p_buf,
1079 int p_buf_len)
1080{
1081 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1082 int ret = 0;
1083 int len;
c66ac9db
NB		 1084
1085 memset(buf, 0, VPD_TMP_BUF_SIZE);
1086 len = sprintf(buf, "T10 VPD Identifier Association: ");
1087
1088 switch (vpd->association) {
1089 case 0x00:
1090 sprintf(buf+len, "addressed logical unit\n");
1091 break;
1092 case 0x10:
1093 sprintf(buf+len, "target port\n");
1094 break;
1095 case 0x20:
1096 sprintf(buf+len, "SCSI target device\n");
1097 break;
1098 default:
1099 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1100 ret = -EINVAL;
c66ac9db
NB		 1101 break;
1102 }
1103
1104 if (p_buf)
1105 strncpy(p_buf, buf, p_buf_len);
1106 else
6708bb27 1107 pr_debug("%s", buf);
c66ac9db
NB		 1108
1109 return ret;
1110}
1111
1112int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1113{
1114 /*
1115 * The VPD identification association..
1116 *
1117 * from spc3r23.pdf Section 7.6.3.1 Table 297
1118 */
1119 vpd->association = (page_83[1] & 0x30);
1120 return transport_dump_vpd_assoc(vpd, NULL, 0);
1121}
1122EXPORT_SYMBOL(transport_set_vpd_assoc);
1123
1124int transport_dump_vpd_ident_type(
1125 struct t10_vpd *vpd,
1126 unsigned char *p_buf,
1127 int p_buf_len)
1128{
1129 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1130 int ret = 0;
1131 int len;
c66ac9db
NB		 1132
1133 memset(buf, 0, VPD_TMP_BUF_SIZE);
1134 len = sprintf(buf, "T10 VPD Identifier Type: ");
1135
1136 switch (vpd->device_identifier_type) {
1137 case 0x00:
1138 sprintf(buf+len, "Vendor specific\n");
1139 break;
1140 case 0x01:
1141 sprintf(buf+len, "T10 Vendor ID based\n");
1142 break;
1143 case 0x02:
1144 sprintf(buf+len, "EUI-64 based\n");
1145 break;
1146 case 0x03:
1147 sprintf(buf+len, "NAA\n");
1148 break;
1149 case 0x04:
1150 sprintf(buf+len, "Relative target port identifier\n");
1151 break;
1152 case 0x08:
1153 sprintf(buf+len, "SCSI name string\n");
1154 break;
1155 default:
1156 sprintf(buf+len, "Unsupported: 0x%02x\n",
1157 vpd->device_identifier_type);
e3d6f909 1158 ret = -EINVAL;
c66ac9db
NB		 1159 break;
1160 }
1161
e3d6f909
AG		 1162 if (p_buf) {
1163 if (p_buf_len < strlen(buf)+1)
1164 return -EINVAL;
c66ac9db 1165 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1166 } else {
6708bb27 1167 pr_debug("%s", buf);
e3d6f909 1168 }
c66ac9db
NB		 1169
1170 return ret;
1171}
1172
1173int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1174{
1175 /*
1176 * The VPD identifier type..
1177 *
1178 * from spc3r23.pdf Section 7.6.3.1 Table 298
1179 */
1180 vpd->device_identifier_type = (page_83[1] & 0x0f);
1181 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1182}
1183EXPORT_SYMBOL(transport_set_vpd_ident_type);
1184
1185int transport_dump_vpd_ident(
1186 struct t10_vpd *vpd,
1187 unsigned char *p_buf,
1188 int p_buf_len)
1189{
1190 unsigned char buf[VPD_TMP_BUF_SIZE];
1191 int ret = 0;
1192
1193 memset(buf, 0, VPD_TMP_BUF_SIZE);
1194
1195 switch (vpd->device_identifier_code_set) {
1196 case 0x01: /* Binary */
1197 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1198 &vpd->device_identifier[0]);
1199 break;
1200 case 0x02: /* ASCII */
1201 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1202 &vpd->device_identifier[0]);
1203 break;
1204 case 0x03: /* UTF-8 */
1205 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1206 &vpd->device_identifier[0]);
1207 break;
1208 default:
1209 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1210 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1211 ret = -EINVAL;
c66ac9db
NB		 1212 break;
1213 }
1214
1215 if (p_buf)
1216 strncpy(p_buf, buf, p_buf_len);
1217 else
6708bb27 1218 pr_debug("%s", buf);
c66ac9db
NB		 1219
1220 return ret;
1221}
1222
1223int
1224transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1225{
1226 static const char hex_str[] = "0123456789abcdef";
1227 int j = 0, i = 4; /* offset to start of the identifer */
1228
1229 /*
1230 * The VPD Code Set (encoding)
1231 *
1232 * from spc3r23.pdf Section 7.6.3.1 Table 296
1233 */
1234 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1235 switch (vpd->device_identifier_code_set) {
1236 case 0x01: /* Binary */
1237 vpd->device_identifier[j++] =
1238 hex_str[vpd->device_identifier_type];
1239 while (i < (4 + page_83[3])) {
1240 vpd->device_identifier[j++] =
1241 hex_str[(page_83[i] & 0xf0) >> 4];
1242 vpd->device_identifier[j++] =
1243 hex_str[page_83[i] & 0x0f];
1244 i++;
1245 }
1246 break;
1247 case 0x02: /* ASCII */
1248 case 0x03: /* UTF-8 */
1249 while (i < (4 + page_83[3]))
1250 vpd->device_identifier[j++] = page_83[i++];
1251 break;
1252 default:
1253 break;
1254 }
1255
1256 return transport_dump_vpd_ident(vpd, NULL, 0);
1257}
1258EXPORT_SYMBOL(transport_set_vpd_ident);
1259
1260static void core_setup_task_attr_emulation(struct se_device *dev)
1261{
1262 /*
1263 * If this device is from Target_Core_Mod/pSCSI, disable the
1264 * SAM Task Attribute emulation.
1265 *
1266 * This is currently not available in upsream Linux/SCSI Target
1267 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1268 */
e3d6f909 1269 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1270 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1271 return;
1272 }
1273
1274 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1275 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1276 " device\n", dev->transport->name,
1277 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1278}
1279
1280static void scsi_dump_inquiry(struct se_device *dev)
1281{
e3d6f909 1282 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1283 char buf[17];
c66ac9db
NB		 1284 int i, device_type;
1285 /*
1286 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1287 */
c66ac9db
NB		 1288 for (i = 0; i < 8; i++)
1289 if (wwn->vendor[i] >= 0x20)
e59a41b6 1290 buf[i] = wwn->vendor[i];
c66ac9db 1291 else
e59a41b6
SAS		 1292 buf[i] = ' ';
1293 buf[i] = '\0';
1294 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1295
c66ac9db
NB		 1296 for (i = 0; i < 16; i++)
1297 if (wwn->model[i] >= 0x20)
e59a41b6 1298 buf[i] = wwn->model[i];
c66ac9db 1299 else
e59a41b6
SAS		 1300 buf[i] = ' ';
1301 buf[i] = '\0';
1302 pr_debug(" Model: %s\n", buf);
c66ac9db 1303
c66ac9db
NB		 1304 for (i = 0; i < 4; i++)
1305 if (wwn->revision[i] >= 0x20)
e59a41b6 1306 buf[i] = wwn->revision[i];
c66ac9db 1307 else
e59a41b6
SAS		 1308 buf[i] = ' ';
1309 buf[i] = '\0';
1310 pr_debug(" Revision: %s\n", buf);
c66ac9db 1311
e3d6f909 1312 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1313 pr_debug(" Type: %s ", scsi_device_type(device_type));
1314 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1315 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1316}
1317
1318struct se_device *transport_add_device_to_core_hba(
1319 struct se_hba *hba,
1320 struct se_subsystem_api *transport,
1321 struct se_subsystem_dev *se_dev,
1322 u32 device_flags,
1323 void *transport_dev,
1324 struct se_dev_limits *dev_limits,
1325 const char *inquiry_prod,
1326 const char *inquiry_rev)
1327{
12a18bdc 1328 int force_pt;
c66ac9db
NB		 1329 struct se_device *dev;
1330
1331 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1332 if (!dev) {
1333 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1334 return NULL;
1335 }
c66ac9db 1336
e3d6f909 1337 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1338 dev->dev_flags = device_flags;
1339 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1340 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1341 dev->se_hba = hba;
1342 dev->se_sub_dev = se_dev;
1343 dev->transport = transport;
c66ac9db
NB		 1344 INIT_LIST_HEAD(&dev->dev_list);
1345 INIT_LIST_HEAD(&dev->dev_sep_list);
1346 INIT_LIST_HEAD(&dev->dev_tmr_list);
1347 INIT_LIST_HEAD(&dev->execute_task_list);
1348 INIT_LIST_HEAD(&dev->delayed_cmd_list);
c66ac9db 1349 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1350 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1351 spin_lock_init(&dev->execute_task_lock);
1352 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1353 spin_lock_init(&dev->dev_reservation_lock);
1354 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1355 spin_lock_init(&dev->se_port_lock);
1356 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1357 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1358 atomic_set(&dev->dev_ordered_id, 0);
1359
1360 se_dev_set_default_attribs(dev, dev_limits);
1361
1362 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1363 dev->creation_time = get_jiffies_64();
1364 spin_lock_init(&dev->stats_lock);
1365
1366 spin_lock(&hba->device_lock);
1367 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1368 hba->dev_count++;
1369 spin_unlock(&hba->device_lock);
1370 /*
1371 * Setup the SAM Task Attribute emulation for struct se_device
1372 */
1373 core_setup_task_attr_emulation(dev);
1374 /*
1375 * Force PR and ALUA passthrough emulation with internal object use.
1376 */
1377 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1378 /*
1379 * Setup the Reservations infrastructure for struct se_device
1380 */
1381 core_setup_reservations(dev, force_pt);
1382 /*
1383 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1384 */
1385 if (core_setup_alua(dev, force_pt) < 0)
1386 goto out;
1387
1388 /*
1389 * Startup the struct se_device processing thread
1390 */
1391 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1392 "LIO_%s", dev->transport->name);
c66ac9db 1393 if (IS_ERR(dev->process_thread)) {
6708bb27 1394 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1395 dev->transport->name);
c66ac9db
NB		 1396 goto out;
1397 }
07bde79a
NB		 1398 /*
1399 * Setup work_queue for QUEUE_FULL
1400 */
1401 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1402 /*
1403 * Preload the initial INQUIRY const values if we are doing
1404 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1405 * passthrough because this is being provided by the backend LLD.
1406 * This is required so that transport_get_inquiry() copies these
1407 * originals once back into DEV_T10_WWN(dev) for the virtual device
1408 * setup.
1409 */
e3d6f909 1410 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1411 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1412 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1413 " INQUIRY consts\n");
1414 goto out;
1415 }
1416
e3d6f909
AG		 1417 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1418 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1419 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1420 }
1421 scsi_dump_inquiry(dev);
1422
12a18bdc 1423 return dev;
c66ac9db 1424out:
c66ac9db
NB		 1425 kthread_stop(dev->process_thread);
1426
1427 spin_lock(&hba->device_lock);
1428 list_del(&dev->dev_list);
1429 hba->dev_count--;
1430 spin_unlock(&hba->device_lock);
1431
1432 se_release_vpd_for_dev(dev);
1433
c66ac9db
NB		 1434 kfree(dev);
1435
1436 return NULL;
1437}
1438EXPORT_SYMBOL(transport_add_device_to_core_hba);
1439
1440/* transport_generic_prepare_cdb():
1441 *
1442 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1443 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1444 * The point of this is since we are mapping iSCSI LUNs to
1445 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1446 * devices and HBAs for a loop.
1447 */
1448static inline void transport_generic_prepare_cdb(
1449 unsigned char *cdb)
1450{
1451 switch (cdb[0]) {
1452 case READ_10: /* SBC - RDProtect */
1453 case READ_12: /* SBC - RDProtect */
1454 case READ_16: /* SBC - RDProtect */
1455 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1456 case VERIFY: /* SBC - VRProtect */
1457 case VERIFY_16: /* SBC - VRProtect */
1458 case WRITE_VERIFY: /* SBC - VRProtect */
1459 case WRITE_VERIFY_12: /* SBC - VRProtect */
1460 break;
1461 default:
1462 cdb[1] &= 0x1f; /* clear logical unit number */
1463 break;
1464 }
1465}
1466
1467static struct se_task *
1468transport_generic_get_task(struct se_cmd *cmd,
1469 enum dma_data_direction data_direction)
1470{
1471 struct se_task *task;
5951146d 1472 struct se_device *dev = cmd->se_dev;
c66ac9db 1473
6708bb27 1474 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1475 if (!task) {
6708bb27 1476 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1477 return NULL;
1478 }
1479
1480 INIT_LIST_HEAD(&task->t_list);
1481 INIT_LIST_HEAD(&task->t_execute_list);
1482 INIT_LIST_HEAD(&task->t_state_list);
1483 init_completion(&task->task_stop_comp);
c66ac9db 1484 task->task_se_cmd = cmd;
c66ac9db
NB		 1485 task->task_data_direction = data_direction;
1486
c66ac9db
NB		 1487 return task;
1488}
1489
1490static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1491
c66ac9db
NB		 1492/*
1493 * Used by fabric modules containing a local struct se_cmd within their
1494 * fabric dependent per I/O descriptor.
1495 */
1496void transport_init_se_cmd(
1497 struct se_cmd *cmd,
1498 struct target_core_fabric_ops *tfo,
1499 struct se_session *se_sess,
1500 u32 data_length,
1501 int data_direction,
1502 int task_attr,
1503 unsigned char *sense_buffer)
1504{
5951146d
AG		 1505 INIT_LIST_HEAD(&cmd->se_lun_node);
1506 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1507 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1508 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1509 INIT_LIST_HEAD(&cmd->se_cmd_list);
a1d8b49a
AG		 1510 INIT_LIST_HEAD(&cmd->t_task_list);
1511 init_completion(&cmd->transport_lun_fe_stop_comp);
1512 init_completion(&cmd->transport_lun_stop_comp);
1513 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1514 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1515 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1516 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1517
1518 cmd->se_tfo = tfo;
1519 cmd->se_sess = se_sess;
1520 cmd->data_length = data_length;
1521 cmd->data_direction = data_direction;
1522 cmd->sam_task_attr = task_attr;
1523 cmd->sense_buffer = sense_buffer;
1524}
1525EXPORT_SYMBOL(transport_init_se_cmd);
1526
1527static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1528{
1529 /*
1530 * Check if SAM Task Attribute emulation is enabled for this
1531 * struct se_device storage object
1532 */
5951146d 1533 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1534 return 0;
1535
e66ecd50 1536 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1537 pr_debug("SAM Task Attribute ACA"
c66ac9db 1538 " emulation is not supported\n");
e3d6f909 1539 return -EINVAL;
c66ac9db
NB		 1540 }
1541 /*
1542 * Used to determine when ORDERED commands should go from
1543 * Dormant to Active status.
1544 */
5951146d 1545 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1546 smp_mb__after_atomic_inc();
6708bb27 1547 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1548 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1549 cmd->se_dev->transport->name);
c66ac9db
NB		 1550 return 0;
1551}
1552
a12f41f8 1553/* target_setup_cmd_from_cdb():
c66ac9db
NB		 1554 *
1555 * Called from fabric RX Thread.
1556 */
a12f41f8 1557int target_setup_cmd_from_cdb(
c66ac9db
NB		 1558 struct se_cmd *cmd,
1559 unsigned char *cdb)
1560{
1561 int ret;
1562
1563 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1564 /*
1565 * Ensure that the received CDB is less than the max (252 + 8) bytes
1566 * for VARIABLE_LENGTH_CMD
1567 */
1568 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1569 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1570 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1571 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1572 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1573 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1574 return -EINVAL;
c66ac9db
NB		 1575 }
1576 /*
1577 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1578 * allocate the additional extended CDB buffer now.. Otherwise
1579 * setup the pointer from __t_task_cdb to t_task_cdb.
1580 */
a1d8b49a
AG		 1581 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1582 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1583 GFP_KERNEL);
6708bb27
AG		 1584 if (!cmd->t_task_cdb) {
1585 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1586 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1587 scsi_command_size(cdb),
a1d8b49a 1588 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1589 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1590 cmd->scsi_sense_reason =
1591 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1592 return -ENOMEM;
c66ac9db
NB		 1593 }
1594 } else
a1d8b49a 1595 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1596 /*
a1d8b49a 1597 * Copy the original CDB into cmd->
c66ac9db 1598 */
a1d8b49a 1599 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1600 /*
1601 * Setup the received CDB based on SCSI defined opcodes and
1602 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1603 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1604 * pointer is expected to be setup before we reach this point.
1605 */
1606 ret = transport_generic_cmd_sequencer(cmd, cdb);
1607 if (ret < 0)
1608 return ret;
1609 /*
1610 * Check for SAM Task Attribute Emulation
1611 */
1612 if (transport_check_alloc_task_attr(cmd) < 0) {
1613 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1614 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1615 return -EINVAL;
c66ac9db
NB		 1616 }
1617 spin_lock(&cmd->se_lun->lun_sep_lock);
1618 if (cmd->se_lun->lun_sep)
1619 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1620 spin_unlock(&cmd->se_lun->lun_sep_lock);
1621 return 0;
1622}
a12f41f8 1623EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1624
695434e1
NB		 1625/*
1626 * Used by fabric module frontends to queue tasks directly.
1627 * Many only be used from process context only
1628 */
1629int transport_handle_cdb_direct(
1630 struct se_cmd *cmd)
1631{
dd8ae59d
NB		 1632 int ret;
1633
695434e1
NB		 1634 if (!cmd->se_lun) {
1635 dump_stack();
6708bb27 1636 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1637 return -EINVAL;
1638 }
1639 if (in_interrupt()) {
1640 dump_stack();
6708bb27 1641 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1642 " from interrupt context\n");
1643 return -EINVAL;
1644 }
dd8ae59d 1645 /*
7d680f3b 1646 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
dd8ae59d
NB		 1647 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1648 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1649 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1650 *
1651 * Also, we don't take cmd->t_state_lock here as we only expect
1652 * this to be called for initial descriptor submission.
1653 */
1654 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1655 cmd->transport_state |= CMD_T_ACTIVE;
1656
dd8ae59d
NB		 1657 /*
1658 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1659 * so follow TRANSPORT_NEW_CMD processing thread context usage
1660 * and call transport_generic_request_failure() if necessary..
1661 */
1662 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1663 if (ret < 0)
1664 transport_generic_request_failure(cmd);
1665
dd8ae59d 1666 return 0;
695434e1
NB		 1667}
1668EXPORT_SYMBOL(transport_handle_cdb_direct);
1669
a6360785
NB		 1670/**
1671 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1672 *
1673 * @se_cmd: command descriptor to submit
1674 * @se_sess: associated se_sess for endpoint
1675 * @cdb: pointer to SCSI CDB
1676 * @sense: pointer to SCSI sense buffer
1677 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1678 * @data_length: fabric expected data transfer length
1679 * @task_addr: SAM task attribute
1680 * @data_dir: DMA data direction
1681 * @flags: flags for command submission from target_sc_flags_tables
1682 *
1683 * This may only be called from process context, and also currently
1684 * assumes internal allocation of fabric payload buffer by target-core.
1685 **/
1edcdb49 1686void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1687 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1688 u32 data_length, int task_attr, int data_dir, int flags)
1689{
1690 struct se_portal_group *se_tpg;
1691 int rc;
1692
1693 se_tpg = se_sess->se_tpg;
1694 BUG_ON(!se_tpg);
1695 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1696 BUG_ON(in_interrupt());
1697 /*
1698 * Initialize se_cmd for target operation. From this point
1699 * exceptions are handled by sending exception status via
1700 * target_core_fabric_ops->queue_status() callback
1701 */
1702 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1703 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1704 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1705 se_cmd->unknown_data_length = 1;
a6360785
NB		 1706 /*
1707 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1708 * se_sess->sess_cmd_list. A second kref_get here is necessary
1709 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1710 * kref_put() to happen during fabric packet acknowledgement.
1711 */
1712 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1713 /*
1714 * Signal bidirectional data payloads to target-core
1715 */
1716 if (flags & TARGET_SCF_BIDI_OP)
1717 se_cmd->se_cmd_flags |= SCF_BIDI;
1718 /*
1719 * Locate se_lun pointer and attach it to struct se_cmd
1720 */
735703ca
NB		 1721 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1722 transport_send_check_condition_and_sense(se_cmd,
1723 se_cmd->scsi_sense_reason, 0);
1724 target_put_sess_cmd(se_sess, se_cmd);
1725 return;
1726 }
a6360785
NB		 1727 /*
1728 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1729 * allocate the necessary tasks to complete the received CDB+data
1730 */
a12f41f8 1731 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca
NB		 1732 if (rc != 0) {
1733 transport_generic_request_failure(se_cmd);
1734 return;
1735 }
a6360785
NB		 1736 /*
1737 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1738 * for immediate execution of READs, otherwise wait for
1739 * transport_generic_handle_data() to be called for WRITEs
1740 * when fabric has filled the incoming buffer.
1741 */
1742 transport_handle_cdb_direct(se_cmd);
1edcdb49 1743 return;
a6360785
NB		 1744}
1745EXPORT_SYMBOL(target_submit_cmd);
1746
9f0d05c2
NB		 1747static void target_complete_tmr_failure(struct work_struct *work)
1748{
1749 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1750
1751 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1752 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1753 transport_generic_free_cmd(se_cmd, 0);
1754}
1755
ea98d7f9
AG		 1756/**
1757 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1758 * for TMR CDBs
1759 *
1760 * @se_cmd: command descriptor to submit
1761 * @se_sess: associated se_sess for endpoint
1762 * @sense: pointer to SCSI sense buffer
1763 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1764 * @fabric_context: fabric context for TMR req
1765 * @tm_type: Type of TM request
c0974f89
NB		 1766 * @gfp: gfp type for caller
1767 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1768 * @flags: submit cmd flags
ea98d7f9
AG		 1769 *
1770 * Callable from all contexts.
1771 **/
1772
c7042cae 1773int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1774 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1775 void *fabric_tmr_ptr, unsigned char tm_type,
1776 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1777{
1778 struct se_portal_group *se_tpg;
1779 int ret;
1780
1781 se_tpg = se_sess->se_tpg;
1782 BUG_ON(!se_tpg);
1783
1784 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1785 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1786 /*
1787 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1788 * allocation failure.
1789 */
c0974f89 1790 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1791 if (ret < 0)
1792 return -ENOMEM;
ea98d7f9 1793
c0974f89
NB		 1794 if (tm_type == TMR_ABORT_TASK)
1795 se_cmd->se_tmr_req->ref_task_tag = tag;
1796
ea98d7f9
AG		 1797 /* See target_submit_cmd for commentary */
1798 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1799
ea98d7f9
AG		 1800 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1801 if (ret) {
9f0d05c2
NB		 1802 /*
1803 * For callback during failure handling, push this work off
1804 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1805 */
1806 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1807 schedule_work(&se_cmd->work);
c7042cae 1808 return 0;
ea98d7f9
AG		 1809 }
1810 transport_generic_handle_tmr(se_cmd);
c7042cae 1811 return 0;
ea98d7f9
AG		 1812}
1813EXPORT_SYMBOL(target_submit_tmr);
1814
c66ac9db
NB		 1815/*
1816 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1817 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1818 * complete setup in TCM process context w/ TFO->new_cmd_map().
1819 */
1820int transport_generic_handle_cdb_map(
1821 struct se_cmd *cmd)
1822{
e3d6f909 1823 if (!cmd->se_lun) {
c66ac9db 1824 dump_stack();
6708bb27 1825 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1826 return -EINVAL;
c66ac9db
NB		 1827 }
1828
f7a5cc0b 1829 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1830 return 0;
1831}
1832EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1833
1834/* transport_generic_handle_data():
1835 *
1836 *
1837 */
1838int transport_generic_handle_data(
1839 struct se_cmd *cmd)
1840{
1841 /*
1842 * For the software fabric case, then we assume the nexus is being
1843 * failed/shutdown when signals are pending from the kthread context
1844 * caller, so we return a failure. For the HW target mode case running
1845 * in interrupt code, the signal_pending() check is skipped.
1846 */
1847 if (!in_interrupt() && signal_pending(current))
e3d6f909 1848 return -EPERM;
c66ac9db
NB		 1849 /*
1850 * If the received CDB has aleady been ABORTED by the generic
1851 * target engine, we now call transport_check_aborted_status()
1852 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1853 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1854 * sequences at this point.
1855 */
1856 if (transport_check_aborted_status(cmd, 1) != 0)
1857 return 0;
1858
f7a5cc0b 1859 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1860 return 0;
1861}
1862EXPORT_SYMBOL(transport_generic_handle_data);
1863
1864/* transport_generic_handle_tmr():
1865 *
1866 *
1867 */
1868int transport_generic_handle_tmr(
1869 struct se_cmd *cmd)
1870{
f7a5cc0b 1871 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1872 return 0;
1873}
1874EXPORT_SYMBOL(transport_generic_handle_tmr);
1875
cdbb70bb
CH		 1876/*
1877 * If the task is active, request it to be stopped and sleep until it
1878 * has completed.
1879 */
1880bool target_stop_task(struct se_task *task, unsigned long *flags)
1881{
1882 struct se_cmd *cmd = task->task_se_cmd;
1883 bool was_active = false;
1884
1885 if (task->task_flags & TF_ACTIVE) {
1886 task->task_flags |= TF_REQUEST_STOP;
1887 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1888
1889 pr_debug("Task %p waiting to complete\n", task);
1890 wait_for_completion(&task->task_stop_comp);
1891 pr_debug("Task %p stopped successfully\n", task);
1892
1893 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1894 atomic_dec(&cmd->t_task_cdbs_left);
1895 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1896 was_active = true;
1897 }
1898
cdbb70bb
CH		 1899 return was_active;
1900}
1901
c66ac9db
NB		 1902static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1903{
1904 struct se_task *task, *task_tmp;
1905 unsigned long flags;
1906 int ret = 0;
1907
6708bb27 1908 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1909 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1910
1911 /*
1912 * No tasks remain in the execution queue
1913 */
a1d8b49a 1914 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1915 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1916 &cmd->t_task_list, t_list) {
04629b7b 1917 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1918 /*
1919 * If the struct se_task has not been sent and is not active,
1920 * remove the struct se_task from the execution queue.
1921 */
6c76bf95 1922 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1923 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1924 flags);
1925 transport_remove_task_from_execute_queue(task,
42bf829e 1926 cmd->se_dev);
c66ac9db 1927
04629b7b 1928 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1929 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1930 continue;
1931 }
1932
cdbb70bb 1933 if (!target_stop_task(task, &flags)) {
04629b7b 1934 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1935 ret++;
1936 }
c66ac9db 1937 }
a1d8b49a 1938 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1939
1940 return ret;
1941}
1942
c66ac9db
NB		 1943/*
1944 * Handle SAM-esque emulation for generic transport request failures.
1945 */
2fbff127 1946void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1947{
07bde79a
NB		 1948 int ret = 0;
1949
6708bb27 1950 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1951 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1952 cmd->t_task_cdb[0]);
03e98c9e 1953 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1954 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1955 cmd->t_state, cmd->scsi_sense_reason);
6708bb27 1956 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db 1957 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
7d680f3b
CH		 1958 " CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1959 cmd->t_task_list_num,
a1d8b49a
AG		 1960 atomic_read(&cmd->t_task_cdbs_left),
1961 atomic_read(&cmd->t_task_cdbs_sent),
1962 atomic_read(&cmd->t_task_cdbs_ex_left),
7d680f3b
CH		 1963 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1964 (cmd->transport_state & CMD_T_STOP) != 0,
1965 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1966
c66ac9db
NB		 1967 /*
1968 * For SAM Task Attribute emulation for failed struct se_cmd
1969 */
1970 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1971 transport_complete_task_attr(cmd);
1972
03e98c9e
NB		 1973 switch (cmd->scsi_sense_reason) {
1974 case TCM_NON_EXISTENT_LUN:
1975 case TCM_UNSUPPORTED_SCSI_OPCODE:
1976 case TCM_INVALID_CDB_FIELD:
1977 case TCM_INVALID_PARAMETER_LIST:
1978 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1979 case TCM_UNKNOWN_MODE_PAGE:
1980 case TCM_WRITE_PROTECTED:
1981 case TCM_CHECK_CONDITION_ABORT_CMD:
1982 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1983 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1984 break;
03e98c9e 1985 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1986 /*
1987 * No SENSE Data payload for this case, set SCSI Status
1988 * and queue the response to $FABRIC_MOD.
1989 *
1990 * Uses linux/include/scsi/scsi.h SAM status codes defs
1991 */
1992 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1993 /*
1994 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1995 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1996 * CONFLICT STATUS.
1997 *
1998 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1999 */
e3d6f909
AG		 2000 if (cmd->se_sess &&
2001 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2002 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2003 cmd->orig_fe_lun, 0x2C,
2004 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2005
07bde79a 2006 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2007 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2008 goto queue_full;
c66ac9db 2009 goto check_stop;
c66ac9db 2010 default:
6708bb27 2011 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 2012 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 2013 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2014 break;
2015 }
16ab8e60
NB		 2016 /*
2017 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2018 * make the call to transport_send_check_condition_and_sense()
2019 * directly. Otherwise expect the fabric to make the call to
2020 * transport_send_check_condition_and_sense() after handling
2021 * possible unsoliticied write data payloads.
2022 */
03e98c9e
NB		 2023 ret = transport_send_check_condition_and_sense(cmd,
2024 cmd->scsi_sense_reason, 0);
2025 if (ret == -EAGAIN || ret == -ENOMEM)
2026 goto queue_full;
07bde79a 2027
c66ac9db
NB		 2028check_stop:
2029 transport_lun_remove_cmd(cmd);
6708bb27 2030 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 2031 ;
07bde79a
NB		 2032 return;
2033
2034queue_full:
e057f533
CH		 2035 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2036 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 2037}
2fbff127 2038EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 2039
c66ac9db
NB		 2040static inline u32 transport_lba_21(unsigned char *cdb)
2041{
2042 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2043}
2044
2045static inline u32 transport_lba_32(unsigned char *cdb)
2046{
2047 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2048}
2049
2050static inline unsigned long long transport_lba_64(unsigned char *cdb)
2051{
2052 unsigned int __v1, __v2;
2053
2054 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2055 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2056
2057 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2058}
2059
2060/*
2061 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2062 */
2063static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2064{
2065 unsigned int __v1, __v2;
2066
2067 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2068 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2069
2070 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2071}
2072
2073static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2074{
2075 unsigned long flags;
2076
a1d8b49a 2077 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2078 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2079 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2080}
2081
c66ac9db
NB		 2082/*
2083 * Called from Fabric Module context from transport_execute_tasks()
2084 *
2085 * The return of this function determins if the tasks from struct se_cmd
2086 * get added to the execution queue in transport_execute_tasks(),
2087 * or are added to the delayed or ordered lists here.
2088 */
2089static inline int transport_execute_task_attr(struct se_cmd *cmd)
2090{
5951146d 2091 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2092 return 1;
2093 /*
25985edc 2094 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2095 * to allow the passed struct se_cmd list of tasks to the front of the list.
2096 */
e66ecd50 2097 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
6708bb27 2098 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2099 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2100 cmd->t_task_cdb[0],
c66ac9db
NB		 2101 cmd->se_ordered_id);
2102 return 1;
e66ecd50 2103 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d 2104 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2105 smp_mb__after_atomic_inc();
2106
6708bb27 2107 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2108 " list, se_ordered_id: %u\n",
a1d8b49a 2109 cmd->t_task_cdb[0],
c66ac9db
NB		 2110 cmd->se_ordered_id);
2111 /*
2112 * Add ORDERED command to tail of execution queue if
2113 * no other older commands exist that need to be
2114 * completed first.
2115 */
6708bb27 2116 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2117 return 1;
2118 } else {
2119 /*
2120 * For SIMPLE and UNTAGGED Task Attribute commands
2121 */
5951146d 2122 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2123 smp_mb__after_atomic_inc();
2124 }
2125 /*
2126 * Otherwise if one or more outstanding ORDERED task attribute exist,
2127 * add the dormant task(s) built for the passed struct se_cmd to the
2128 * execution queue and become in Active state for this struct se_device.
2129 */
5951146d 2130 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2131 /*
2132 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2133 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2134 */
5951146d 2135 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2136 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2137 list_add_tail(&cmd->se_delayed_node,
2138 &cmd->se_dev->delayed_cmd_list);
2139 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2140
6708bb27 2141 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2142 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2143 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2144 cmd->se_ordered_id);
2145 /*
2146 * Return zero to let transport_execute_tasks() know
2147 * not to add the delayed tasks to the execution list.
2148 */
2149 return 0;
2150 }
2151 /*
2152 * Otherwise, no ORDERED task attributes exist..
2153 */
2154 return 1;
2155}
2156
2157/*
2158 * Called from fabric module context in transport_generic_new_cmd() and
2159 * transport_generic_process_write()
2160 */
2161static int transport_execute_tasks(struct se_cmd *cmd)
2162{
2163 int add_tasks;
40be67f4 2164 struct se_device *se_dev = cmd->se_dev;
c66ac9db
NB		 2165 /*
2166 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2167 * has occurred that prevents execution.
c66ac9db 2168 */
6708bb27 2169 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2170 /*
2171 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2172 * attribute for the tasks of the received struct se_cmd CDB
2173 */
2174 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2175 if (!add_tasks)
c66ac9db
NB		 2176 goto execute_tasks;
2177 /*
4d2300cc
NB		 2178 * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2179 * adds associated se_tasks while holding dev->execute_task_lock
2180 * before I/O dispath to avoid a double spinlock access.
c66ac9db 2181 */
4d2300cc
NB		 2182 __transport_execute_tasks(se_dev, cmd);
2183 return 0;
c66ac9db 2184 }
4d2300cc 2185
c66ac9db 2186execute_tasks:
4d2300cc 2187 __transport_execute_tasks(se_dev, NULL);
c66ac9db
NB		 2188 return 0;
2189}
2190
2191/*
2192 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2193 * from struct se_device->execute_task_list and
2194 *
2195 * Called from transport_processing_thread()
2196 */
4d2300cc 2197static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
c66ac9db
NB		 2198{
2199 int error;
2200 struct se_cmd *cmd = NULL;
e3d6f909 2201 struct se_task *task = NULL;
c66ac9db
NB		 2202 unsigned long flags;
2203
c66ac9db 2204check_depth:
e3d6f909 2205 spin_lock_irq(&dev->execute_task_lock);
4d2300cc
NB		 2206 if (new_cmd != NULL)
2207 __transport_add_tasks_from_cmd(new_cmd);
2208
e3d6f909
AG		 2209 if (list_empty(&dev->execute_task_list)) {
2210 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2211 return 0;
2212 }
e3d6f909
AG		 2213 task = list_first_entry(&dev->execute_task_list,
2214 struct se_task, t_execute_list);
04629b7b 2215 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2216 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db 2217
e3d6f909 2218 cmd = task->task_se_cmd;
a1d8b49a 2219 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2220 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2221 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2222
a1d8b49a
AG		 2223 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2224 cmd->t_task_list_num)
7d680f3b 2225 cmd->transport_state |= CMD_T_SENT;
c66ac9db 2226
a1d8b49a 2227 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2228
5bda90c8
CH		 2229 if (cmd->execute_task)
2230 error = cmd->execute_task(task);
2231 else
2232 error = dev->transport->do_task(task);
d29a5b6a 2233 if (error != 0) {
d29a5b6a
CH		 2234 spin_lock_irqsave(&cmd->t_state_lock, flags);
2235 task->task_flags &= ~TF_ACTIVE;
7d680f3b 2236 cmd->transport_state &= ~CMD_T_SENT;
d29a5b6a 2237 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
7d680f3b 2238
d29a5b6a 2239 transport_stop_tasks_for_cmd(cmd);
03e98c9e 2240 transport_generic_request_failure(cmd);
c66ac9db
NB		 2241 }
2242
4d2300cc 2243 new_cmd = NULL;
c66ac9db
NB		 2244 goto check_depth;
2245
2246 return 0;
2247}
2248
c66ac9db
NB		 2249static inline u32 transport_get_sectors_6(
2250 unsigned char *cdb,
2251 struct se_cmd *cmd,
2252 int *ret)
2253{
5951146d 2254 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2255
2256 /*
2257 * Assume TYPE_DISK for non struct se_device objects.
2258 * Use 8-bit sector value.
2259 */
2260 if (!dev)
2261 goto type_disk;
2262
2263 /*
2264 * Use 24-bit allocation length for TYPE_TAPE.
2265 */
e3d6f909 2266 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2267 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2268
2269 /*
2270 * Everything else assume TYPE_DISK Sector CDB location.
9b5cd7f3
RD		 2271 * Use 8-bit sector value. SBC-3 says:
2272 *
2273 * A TRANSFER LENGTH field set to zero specifies that 256
2274 * logical blocks shall be written. Any other value
2275 * specifies the number of logical blocks that shall be
2276 * written.
c66ac9db
NB		 2277 */
2278type_disk:
9b5cd7f3 2279 return cdb[4] ? : 256;
c66ac9db
NB		 2280}
2281
2282static inline u32 transport_get_sectors_10(
2283 unsigned char *cdb,
2284 struct se_cmd *cmd,
2285 int *ret)
2286{
5951146d 2287 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2288
2289 /*
2290 * Assume TYPE_DISK for non struct se_device objects.
2291 * Use 16-bit sector value.
2292 */
2293 if (!dev)
2294 goto type_disk;
2295
2296 /*
2297 * XXX_10 is not defined in SSC, throw an exception
2298 */
e3d6f909
AG		 2299 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2300 *ret = -EINVAL;
c66ac9db
NB		 2301 return 0;
2302 }
2303
2304 /*
2305 * Everything else assume TYPE_DISK Sector CDB location.
2306 * Use 16-bit sector value.
2307 */
2308type_disk:
2309 return (u32)(cdb[7] << 8) + cdb[8];
2310}
2311
2312static inline u32 transport_get_sectors_12(
2313 unsigned char *cdb,
2314 struct se_cmd *cmd,
2315 int *ret)
2316{
5951146d 2317 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2318
2319 /*
2320 * Assume TYPE_DISK for non struct se_device objects.
2321 * Use 32-bit sector value.
2322 */
2323 if (!dev)
2324 goto type_disk;
2325
2326 /*
2327 * XXX_12 is not defined in SSC, throw an exception
2328 */
e3d6f909
AG		 2329 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2330 *ret = -EINVAL;
c66ac9db
NB		 2331 return 0;
2332 }
2333
2334 /*
2335 * Everything else assume TYPE_DISK Sector CDB location.
2336 * Use 32-bit sector value.
2337 */
2338type_disk:
2339 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2340}
2341
2342static inline u32 transport_get_sectors_16(
2343 unsigned char *cdb,
2344 struct se_cmd *cmd,
2345 int *ret)
2346{
5951146d 2347 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2348
2349 /*
2350 * Assume TYPE_DISK for non struct se_device objects.
2351 * Use 32-bit sector value.
2352 */
2353 if (!dev)
2354 goto type_disk;
2355
2356 /*
2357 * Use 24-bit allocation length for TYPE_TAPE.
2358 */
e3d6f909 2359 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2360 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2361
2362type_disk:
2363 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2364 (cdb[12] << 8) + cdb[13];
2365}
2366
2367/*
2368 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2369 */
2370static inline u32 transport_get_sectors_32(
2371 unsigned char *cdb,
2372 struct se_cmd *cmd,
2373 int *ret)
2374{
2375 /*
2376 * Assume TYPE_DISK for non struct se_device objects.
2377 * Use 32-bit sector value.
2378 */
2379 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2380 (cdb[30] << 8) + cdb[31];
2381
2382}
2383
2384static inline u32 transport_get_size(
2385 u32 sectors,
2386 unsigned char *cdb,
2387 struct se_cmd *cmd)
2388{
5951146d 2389 struct se_device *dev = cmd->se_dev;
c66ac9db 2390
e3d6f909 2391 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2392 if (cdb[1] & 1) { /* sectors */
e3d6f909 2393 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2394 } else /* bytes */
2395 return sectors;
2396 }
8b1e1244 2397
6708bb27 2398 pr_debug("Returning block_size: %u, sectors: %u == %u for"
8b1e1244
AG		 2399 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size,
2400 sectors, dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2401 dev->transport->name);
2402
e3d6f909 2403 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2404}
2405
c66ac9db
NB		 2406static void transport_xor_callback(struct se_cmd *cmd)
2407{
2408 unsigned char *buf, *addr;
ec98f782 2409 struct scatterlist *sg;
c66ac9db
NB		 2410 unsigned int offset;
2411 int i;
ec98f782 2412 int count;
c66ac9db
NB		 2413 /*
2414 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2415 *
2416 * 1) read the specified logical block(s);
2417 * 2) transfer logical blocks from the data-out buffer;
2418 * 3) XOR the logical blocks transferred from the data-out buffer with
2419 * the logical blocks read, storing the resulting XOR data in a buffer;
2420 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2421 * blocks transferred from the data-out buffer; and
2422 * 5) transfer the resulting XOR data to the data-in buffer.
2423 */
2424 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2425 if (!buf) {
2426 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2427 return;
2428 }
2429 /*
ec98f782 2430 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2431 * into the locally allocated *buf
2432 */
ec98f782
AG		 2433 sg_copy_to_buffer(cmd->t_data_sg,
2434 cmd->t_data_nents,
2435 buf,
2436 cmd->data_length);
2437
c66ac9db
NB		 2438 /*
2439 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2440 * cmd->t_mem_bidi_list
c66ac9db
NB		 2441 */
2442
2443 offset = 0;
ec98f782 2444 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
ca747d61 2445 addr = kmap_atomic(sg_page(sg));
ec98f782 2446 if (!addr)
c66ac9db
NB		 2447 goto out;
2448
ec98f782
AG		 2449 for (i = 0; i < sg->length; i++)
2450 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2451
ec98f782 2452 offset += sg->length;
ca747d61 2453 kunmap_atomic(addr);
c66ac9db 2454 }
ec98f782 2455
c66ac9db
NB		 2456out:
2457 kfree(buf);
2458}
2459
2460/*
2461 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2462 */
2463static int transport_get_sense_data(struct se_cmd *cmd)
2464{
2465 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2466 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2467 struct se_task *task = NULL, *task_tmp;
2468 unsigned long flags;
2469 u32 offset = 0;
2470
e3d6f909
AG		 2471 WARN_ON(!cmd->se_lun);
2472
42bf829e
CH		 2473 if (!dev)
2474 return 0;
2475
a1d8b49a 2476 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2477 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2478 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2479 return 0;
2480 }
2481
2482 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2483 &cmd->t_task_list, t_list) {
ef804a84 2484 if (!(task->task_flags & TF_HAS_SENSE))
c66ac9db
NB		 2485 continue;
2486
e3d6f909 2487 if (!dev->transport->get_sense_buffer) {
6708bb27 2488 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2489 " is NULL\n");
2490 continue;
2491 }
2492
e3d6f909 2493 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2494 if (!sense_buffer) {
04629b7b 2495 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2496 " sense buffer for task with sense\n",
04629b7b 2497 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2498 continue;
2499 }
a1d8b49a 2500 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2501
e3d6f909 2502 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2503 TRANSPORT_SENSE_BUFFER);
2504
5951146d 2505 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2506 TRANSPORT_SENSE_BUFFER);
2507 cmd->scsi_status = task->task_scsi_status;
2508 /* Automatically padded */
2509 cmd->scsi_sense_length =
2510 (TRANSPORT_SENSE_BUFFER + offset);
2511
6708bb27 2512 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2513 " and sense\n",
e3d6f909 2514 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2515 cmd->scsi_status);
2516 return 0;
2517 }
a1d8b49a 2518 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2519
2520 return -1;
2521}
2522
ec98f782
AG		 2523static inline long long transport_dev_end_lba(struct se_device *dev)
2524{
2525 return dev->transport->get_blocks(dev) + 1;
2526}
2527
2528static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2529{
2530 struct se_device *dev = cmd->se_dev;
2531 u32 sectors;
2532
2533 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2534 return 0;
2535
2536 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2537
6708bb27
AG		 2538 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2539 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2540 " transport_dev_end_lba(): %llu\n",
2541 cmd->t_task_lba, sectors,
2542 transport_dev_end_lba(dev));
7abbe7f3 2543 return -EINVAL;
ec98f782
AG		 2544 }
2545
7abbe7f3 2546 return 0;
ec98f782
AG		 2547}
2548
706d5860
NB		 2549static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2550{
2551 /*
2552 * Determine if the received WRITE_SAME is used to for direct
2553 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2554 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2555 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2556 */
2557 int passthrough = (dev->transport->transport_type ==
2558 TRANSPORT_PLUGIN_PHBA_PDEV);
2559
2560 if (!passthrough) {
2561 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2562 pr_err("WRITE_SAME PBDATA and LBDATA"
2563 " bits not supported for Block Discard"
2564 " Emulation\n");
2565 return -ENOSYS;
2566 }
2567 /*
2568 * Currently for the emulated case we only accept
2569 * tpws with the UNMAP=1 bit set.
2570 */
2571 if (!(flags[0] & 0x08)) {
2572 pr_err("WRITE_SAME w/o UNMAP bit not"
2573 " supported for Block Discard Emulation\n");
2574 return -ENOSYS;
2575 }
2576 }
2577
2578 return 0;
2579}
2580
c66ac9db
NB		 2581/* transport_generic_cmd_sequencer():
2582 *
2583 * Generic Command Sequencer that should work for most DAS transport
2584 * drivers.
2585 *
a12f41f8 2586 * Called from target_setup_cmd_from_cdb() in the $FABRIC_MOD
c66ac9db
NB		 2587 * RX Thread.
2588 *
2589 * FIXME: Need to support other SCSI OPCODES where as well.
2590 */
2591static int transport_generic_cmd_sequencer(
2592 struct se_cmd *cmd,
2593 unsigned char *cdb)
2594{
5951146d 2595 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2596 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2597 int ret = 0, sector_ret = 0, passthrough;
2598 u32 sectors = 0, size = 0, pr_reg_type = 0;
2599 u16 service_action;
2600 u8 alua_ascq = 0;
2601 /*
2602 * Check for an existing UNIT ATTENTION condition
2603 */
2604 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2605 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2606 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2607 return -EINVAL;
c66ac9db
NB		 2608 }
2609 /*
2610 * Check status of Asymmetric Logical Unit Assignment port
2611 */
e3d6f909 2612 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2613 if (ret != 0) {
c66ac9db 2614 /*
25985edc 2615 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2616 * The ALUA additional sense code qualifier (ASCQ) is determined
2617 * by the ALUA primary or secondary access state..
2618 */
2619 if (ret > 0) {
6708bb27 2620 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2621 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2622 cmd->se_tfo->get_fabric_name(), alua_ascq);
8b1e1244 2623
c66ac9db
NB		 2624 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2625 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2626 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2627 return -EINVAL;
c66ac9db
NB		 2628 }
2629 goto out_invalid_cdb_field;
2630 }
2631 /*
2632 * Check status for SPC-3 Persistent Reservations
2633 */
e3d6f909
AG		 2634 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2635 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2636 cmd, cdb, pr_reg_type) != 0) {
2637 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2638 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
087a03b3 2639 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
03e98c9e
NB		 2640 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2641 return -EBUSY;
2642 }
c66ac9db
NB		 2643 /*
2644 * This means the CDB is allowed for the SCSI Initiator port
2645 * when said port is *NOT* holding the legacy SPC-2 or
2646 * SPC-3 Persistent Reservation.
2647 */
2648 }
2649
5bda90c8
CH		 2650 /*
2651 * If we operate in passthrough mode we skip most CDB emulation and
2652 * instead hand the commands down to the physical SCSI device.
2653 */
2654 passthrough =
2655 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2656
c66ac9db
NB		 2657 switch (cdb[0]) {
2658 case READ_6:
2659 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2660 if (sector_ret)
2661 goto out_unsupported_cdb;
2662 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2663 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2664 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2665 break;
2666 case READ_10:
2667 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2668 if (sector_ret)
2669 goto out_unsupported_cdb;
2670 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2671 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2672 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2673 break;
2674 case READ_12:
2675 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2676 if (sector_ret)
2677 goto out_unsupported_cdb;
2678 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2679 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2680 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2681 break;
2682 case READ_16:
2683 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2684 if (sector_ret)
2685 goto out_unsupported_cdb;
2686 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2687 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2688 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2689 break;
2690 case WRITE_6:
2691 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2692 if (sector_ret)
2693 goto out_unsupported_cdb;
2694 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2695 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2696 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2697 break;
2698 case WRITE_10:
2699 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2700 if (sector_ret)
2701 goto out_unsupported_cdb;
2702 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2703 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2704 if (cdb[1] & 0x8)
2705 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2706 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2707 break;
2708 case WRITE_12:
2709 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2710 if (sector_ret)
2711 goto out_unsupported_cdb;
2712 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2713 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2714 if (cdb[1] & 0x8)
2715 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2716 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2717 break;
2718 case WRITE_16:
2719 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2720 if (sector_ret)
2721 goto out_unsupported_cdb;
2722 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2723 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2724 if (cdb[1] & 0x8)
2725 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2726 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2727 break;
2728 case XDWRITEREAD_10:
2729 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2730 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2731 goto out_invalid_cdb_field;
2732 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2733 if (sector_ret)
2734 goto out_unsupported_cdb;
2735 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2736 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2737 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2738
5bda90c8
CH		 2739 /*
2740 * Do now allow BIDI commands for passthrough mode.
2741 */
2742 if (passthrough)
7c1c6af3 2743 goto out_unsupported_cdb;
5bda90c8 2744
c66ac9db 2745 /*
35e0e757 2746 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2747 */
2748 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2749 if (cdb[1] & 0x8)
2750 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2751 break;
2752 case VARIABLE_LENGTH_CMD:
2753 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2754 switch (service_action) {
2755 case XDWRITEREAD_32:
2756 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2757 if (sector_ret)
2758 goto out_unsupported_cdb;
2759 size = transport_get_size(sectors, cdb, cmd);
2760 /*
2761 * Use WRITE_32 and READ_32 opcodes for the emulated
2762 * XDWRITE_READ_32 logic.
2763 */
a1d8b49a 2764 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2765 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2766
5bda90c8
CH		 2767 /*
2768 * Do now allow BIDI commands for passthrough mode.
2769 */
c66ac9db 2770 if (passthrough)
7c1c6af3 2771 goto out_unsupported_cdb;
5bda90c8 2772
c66ac9db 2773 /*
35e0e757
CH		 2774 * Setup BIDI XOR callback to be run during after I/O
2775 * completion.
c66ac9db
NB		 2776 */
2777 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2778 if (cdb[1] & 0x8)
2779 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2780 break;
2781 case WRITE_SAME_32:
2782 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2783 if (sector_ret)
2784 goto out_unsupported_cdb;
dd3a5ad8 2785
6708bb27 2786 if (sectors)
12850626 2787 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2788 else {
2789 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2790 " supported\n");
2791 goto out_invalid_cdb_field;
2792 }
dd3a5ad8 2793
a1d8b49a 2794 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2795 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2796
706d5860 2797 if (target_check_write_same_discard(&cdb[10], dev) < 0)
67236c44 2798 goto out_unsupported_cdb;
5bda90c8
CH		 2799 if (!passthrough)
2800 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2801 break;
2802 default:
6708bb27 2803 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2804 " 0x%04x not supported\n", service_action);
2805 goto out_unsupported_cdb;
2806 }
2807 break;
e434f1f1 2808 case MAINTENANCE_IN:
e3d6f909 2809 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2810 /* MAINTENANCE_IN from SCC-2 */
2811 /*
2812 * Check for emulated MI_REPORT_TARGET_PGS.
2813 */
e76a35d6
CH		 2814 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2815 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2816 cmd->execute_task =
2817 target_emulate_report_target_port_groups;
c66ac9db
NB		 2818 }
2819 size = (cdb[6] << 24) | (cdb[7] << 16) |
2820 (cdb[8] << 8) | cdb[9];
2821 } else {
2822 /* GPCMD_SEND_KEY from multi media commands */
2823 size = (cdb[8] << 8) + cdb[9];
2824 }
05d1c7c0 2825 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2826 break;
2827 case MODE_SELECT:
2828 size = cdb[4];
2829 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2830 break;
2831 case MODE_SELECT_10:
2832 size = (cdb[7] << 8) + cdb[8];
2833 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2834 break;
2835 case MODE_SENSE:
2836 size = cdb[4];
05d1c7c0 2837 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2838 if (!passthrough)
2839 cmd->execute_task = target_emulate_modesense;
c66ac9db
NB		 2840 break;
2841 case MODE_SENSE_10:
5bda90c8
CH		 2842 size = (cdb[7] << 8) + cdb[8];
2843 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2844 if (!passthrough)
2845 cmd->execute_task = target_emulate_modesense;
2846 break;
c66ac9db
NB		 2847 case GPCMD_READ_BUFFER_CAPACITY:
2848 case GPCMD_SEND_OPC:
2849 case LOG_SELECT:
2850 case LOG_SENSE:
2851 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2852 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2853 break;
2854 case READ_BLOCK_LIMITS:
2855 size = READ_BLOCK_LEN;
05d1c7c0 2856 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2857 break;
2858 case GPCMD_GET_CONFIGURATION:
2859 case GPCMD_READ_FORMAT_CAPACITIES:
2860 case GPCMD_READ_DISC_INFO:
2861 case GPCMD_READ_TRACK_RZONE_INFO:
2862 size = (cdb[7] << 8) + cdb[8];
2863 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2864 break;
2865 case PERSISTENT_RESERVE_IN:
617c0e06 2866 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2867 cmd->execute_task = target_scsi3_emulate_pr_in;
617c0e06
CH		 2868 size = (cdb[7] << 8) + cdb[8];
2869 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2870 break;
c66ac9db 2871 case PERSISTENT_RESERVE_OUT:
617c0e06 2872 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2873 cmd->execute_task = target_scsi3_emulate_pr_out;
c66ac9db 2874 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2875 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2876 break;
2877 case GPCMD_MECHANISM_STATUS:
2878 case GPCMD_READ_DVD_STRUCTURE:
2879 size = (cdb[8] << 8) + cdb[9];
2880 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2881 break;
2882 case READ_POSITION:
2883 size = READ_POSITION_LEN;
05d1c7c0 2884 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2885 break;
e434f1f1 2886 case MAINTENANCE_OUT:
e3d6f909 2887 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2888 /* MAINTENANCE_OUT from SCC-2
2889 *
2890 * Check for emulated MO_SET_TARGET_PGS.
2891 */
e76a35d6
CH		 2892 if (cdb[1] == MO_SET_TARGET_PGS &&
2893 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2894 cmd->execute_task =
2895 target_emulate_set_target_port_groups;
c66ac9db
NB		 2896 }
2897
2898 size = (cdb[6] << 24) | (cdb[7] << 16) |
2899 (cdb[8] << 8) | cdb[9];
2900 } else {
2901 /* GPCMD_REPORT_KEY from multi media commands */
2902 size = (cdb[8] << 8) + cdb[9];
2903 }
05d1c7c0 2904 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2905 break;
2906 case INQUIRY:
2907 size = (cdb[3] << 8) + cdb[4];
2908 /*
2909 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2910 * See spc4r17 section 5.3
2911 */
5951146d 2912 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2913 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2914 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2915 if (!passthrough)
2916 cmd->execute_task = target_emulate_inquiry;
c66ac9db
NB		 2917 break;
2918 case READ_BUFFER:
2919 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2920 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2921 break;
2922 case READ_CAPACITY:
2923 size = READ_CAP_LEN;
05d1c7c0 2924 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2925 if (!passthrough)
2926 cmd->execute_task = target_emulate_readcapacity;
c66ac9db
NB		 2927 break;
2928 case READ_MEDIA_SERIAL_NUMBER:
2929 case SECURITY_PROTOCOL_IN:
2930 case SECURITY_PROTOCOL_OUT:
2931 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2932 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2933 break;
2934 case SERVICE_ACTION_IN:
5bda90c8
CH		 2935 switch (cmd->t_task_cdb[1] & 0x1f) {
2936 case SAI_READ_CAPACITY_16:
2937 if (!passthrough)
2938 cmd->execute_task =
2939 target_emulate_readcapacity_16;
2940 break;
2941 default:
2942 if (passthrough)
2943 break;
2944
2945 pr_err("Unsupported SA: 0x%02x\n",
2946 cmd->t_task_cdb[1] & 0x1f);
b168fe8c 2947 goto out_invalid_cdb_field;
5bda90c8
CH		 2948 }
2949 /*FALLTHROUGH*/
c66ac9db
NB		 2950 case ACCESS_CONTROL_IN:
2951 case ACCESS_CONTROL_OUT:
2952 case EXTENDED_COPY:
2953 case READ_ATTRIBUTE:
2954 case RECEIVE_COPY_RESULTS:
2955 case WRITE_ATTRIBUTE:
2956 size = (cdb[10] << 24) | (cdb[11] << 16) |
2957 (cdb[12] << 8) | cdb[13];
05d1c7c0 2958 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2959 break;
2960 case RECEIVE_DIAGNOSTIC:
2961 case SEND_DIAGNOSTIC:
2962 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2963 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2964 break;
2965/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2966#if 0
2967 case GPCMD_READ_CD:
2968 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2969 size = (2336 * sectors);
05d1c7c0 2970 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2971 break;
2972#endif
2973 case READ_TOC:
2974 size = cdb[8];
05d1c7c0 2975 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2976 break;
2977 case REQUEST_SENSE:
2978 size = cdb[4];
05d1c7c0 2979 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2980 if (!passthrough)
2981 cmd->execute_task = target_emulate_request_sense;
c66ac9db
NB		 2982 break;
2983 case READ_ELEMENT_STATUS:
2984 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2985 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2986 break;
2987 case WRITE_BUFFER:
2988 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2989 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2990 break;
2991 case RESERVE:
2992 case RESERVE_10:
2993 /*
2994 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2995 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2996 */
2997 if (cdb[0] == RESERVE_10)
2998 size = (cdb[7] << 8) | cdb[8];
2999 else
3000 size = cmd->data_length;
3001
3002 /*
3003 * Setup the legacy emulated handler for SPC-2 and
3004 * >= SPC-3 compatible reservation handling (CRH=1)
3005 * Otherwise, we assume the underlying SCSI logic is
3006 * is running in SPC_PASSTHROUGH, and wants reservations
3007 * emulation disabled.
3008 */
e76a35d6
CH		 3009 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
3010 cmd->execute_task = target_scsi2_reservation_reserve;
c66ac9db
NB		 3011 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3012 break;
3013 case RELEASE:
3014 case RELEASE_10:
3015 /*
3016 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3017 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3018 */
3019 if (cdb[0] == RELEASE_10)
3020 size = (cdb[7] << 8) | cdb[8];
3021 else
3022 size = cmd->data_length;
3023
e76a35d6
CH		 3024 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
3025 cmd->execute_task = target_scsi2_reservation_release;
c66ac9db
NB		 3026 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3027 break;
3028 case SYNCHRONIZE_CACHE:
8e94b8db 3029 case SYNCHRONIZE_CACHE_16:
c66ac9db
NB		 3030 /*
3031 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3032 */
3033 if (cdb[0] == SYNCHRONIZE_CACHE) {
3034 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3035 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3036 } else {
3037 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3038 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3039 }
3040 if (sector_ret)
3041 goto out_unsupported_cdb;
3042
3043 size = transport_get_size(sectors, cdb, cmd);
3044 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3045
5bda90c8 3046 if (passthrough)
c66ac9db 3047 break;
5bda90c8 3048
c66ac9db
NB		 3049 /*
3050 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3051 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3052 */
7abbe7f3
NB		 3053 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3054 if (transport_cmd_get_valid_sectors(cmd) < 0)
3055 goto out_invalid_cdb_field;
3056 }
5bda90c8 3057 cmd->execute_task = target_emulate_synchronize_cache;
c66ac9db
NB		 3058 break;
3059 case UNMAP:
3060 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3061 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 3062 if (!passthrough)
3063 cmd->execute_task = target_emulate_unmap;
c66ac9db
NB		 3064 break;
3065 case WRITE_SAME_16:
3066 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3067 if (sector_ret)
3068 goto out_unsupported_cdb;
dd3a5ad8 3069
6708bb27 3070 if (sectors)
12850626 3071 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3072 else {
3073 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3074 goto out_invalid_cdb_field;
3075 }
dd3a5ad8 3076
5db0753b 3077 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3078 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3079
3080 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 3081 goto out_unsupported_cdb;
5bda90c8
CH		 3082 if (!passthrough)
3083 cmd->execute_task = target_emulate_write_same;
706d5860
NB		 3084 break;
3085 case WRITE_SAME:
3086 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3087 if (sector_ret)
3088 goto out_unsupported_cdb;
3089
3090 if (sectors)
12850626 3091 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3092 else {
3093 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3094 goto out_invalid_cdb_field;
c66ac9db 3095 }
706d5860
NB		 3096
3097 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3098 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3099 /*
3100 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3101 * of byte 1 bit 3 UNMAP instead of original reserved field
3102 */
3103 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 3104 goto out_unsupported_cdb;
5bda90c8
CH		 3105 if (!passthrough)
3106 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 3107 break;
3108 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 3109 case ERASE:
c66ac9db
NB		 3110 case REZERO_UNIT:
3111 case SEEK_10:
c66ac9db
NB		 3112 case SPACE:
3113 case START_STOP:
3114 case TEST_UNIT_READY:
3115 case VERIFY:
3116 case WRITE_FILEMARKS:
5bda90c8
CH		 3117 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3118 if (!passthrough)
3119 cmd->execute_task = target_emulate_noop;
3120 break;
3121 case GPCMD_CLOSE_TRACK:
3122 case INITIALIZE_ELEMENT_STATUS:
3123 case GPCMD_LOAD_UNLOAD:
3124 case GPCMD_SET_SPEED:
c66ac9db
NB		 3125 case MOVE_MEDIUM:
3126 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3127 break;
3128 case REPORT_LUNS:
e76a35d6 3129 cmd->execute_task = target_report_luns;
c66ac9db
NB		 3130 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3131 /*
3132 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3133 * See spc4r17 section 5.3
3134 */
5951146d 3135 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3136 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3137 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3138 break;
3139 default:
6708bb27 3140 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3141 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3142 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3143 goto out_unsupported_cdb;
3144 }
3145
b0d79946
SAS		 3146 if (cmd->unknown_data_length)
3147 cmd->data_length = size;
3148
c66ac9db 3149 if (size != cmd->data_length) {
6708bb27 3150 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3151 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3152 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3153 cmd->data_length, size, cdb[0]);
3154
3155 cmd->cmd_spdtl = size;
3156
3157 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3158 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3159 " WRITE data\n");
3160 goto out_invalid_cdb_field;
3161 }
3162 /*
3163 * Reject READ_* or WRITE_* with overflow/underflow for
3164 * type SCF_SCSI_DATA_SG_IO_CDB.
3165 */
6708bb27
AG		 3166 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3167 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3168 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3169 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3170 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3171 goto out_invalid_cdb_field;
3172 }
3173
3174 if (size > cmd->data_length) {
3175 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3176 cmd->residual_count = (size - cmd->data_length);
3177 } else {
3178 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3179 cmd->residual_count = (cmd->data_length - size);
3180 }
3181 cmd->data_length = size;
3182 }
3183
015487b8 3184 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB &&
bebe2fdc
CH		 3185 (sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors ||
3186 sectors > dev->se_sub_dev->se_dev_attrib.max_sectors)) {
015487b8
RD		 3187 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too big sectors %u\n",
3188 cdb[0], sectors);
3189 goto out_invalid_cdb_field;
3190 }
3191
5bda90c8
CH		 3192 /* reject any command that we don't have a handler for */
3193 if (!(passthrough || cmd->execute_task ||
3194 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3195 goto out_unsupported_cdb;
3196
c66ac9db
NB		 3197 transport_set_supported_SAM_opcode(cmd);
3198 return ret;
3199
3200out_unsupported_cdb:
3201 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3202 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3203 return -EINVAL;
c66ac9db
NB		 3204out_invalid_cdb_field:
3205 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3206 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3207 return -EINVAL;
c66ac9db
NB		 3208}
3209
c66ac9db 3210/*
35e0e757 3211 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3212 * and ordered cmds need to have their tasks added to the execution queue.
3213 */
3214static void transport_complete_task_attr(struct se_cmd *cmd)
3215{
5951146d 3216 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3217 struct se_cmd *cmd_p, *cmd_tmp;
3218 int new_active_tasks = 0;
3219
e66ecd50 3220 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3221 atomic_dec(&dev->simple_cmds);
3222 smp_mb__after_atomic_dec();
3223 dev->dev_cur_ordered_id++;
6708bb27 3224 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3225 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3226 cmd->se_ordered_id);
e66ecd50 3227 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3228 dev->dev_cur_ordered_id++;
6708bb27 3229 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3230 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3231 cmd->se_ordered_id);
e66ecd50 3232 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3233 atomic_dec(&dev->dev_ordered_sync);
3234 smp_mb__after_atomic_dec();
c66ac9db
NB		 3235
3236 dev->dev_cur_ordered_id++;
6708bb27 3237 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3238 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3239 }
3240 /*
3241 * Process all commands up to the last received
3242 * ORDERED task attribute which requires another blocking
3243 * boundary
3244 */
3245 spin_lock(&dev->delayed_cmd_lock);
3246 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3247 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3248
5951146d 3249 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3250 spin_unlock(&dev->delayed_cmd_lock);
3251
6708bb27 3252 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3253 " cmd_p: 0x%02x Task Attr: 0x%02x"
3254 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3255 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3256 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3257
3258 transport_add_tasks_from_cmd(cmd_p);
3259 new_active_tasks++;
3260
3261 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3262 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3263 break;
3264 }
3265 spin_unlock(&dev->delayed_cmd_lock);
3266 /*
3267 * If new tasks have become active, wake up the transport thread
3268 * to do the processing of the Active tasks.
3269 */
3270 if (new_active_tasks != 0)
e3d6f909 3271 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3272}
3273
e057f533 3274static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3275{
3276 int ret = 0;
3277
e057f533
CH		 3278 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3279 transport_complete_task_attr(cmd);
3280
3281 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3282 ret = cmd->se_tfo->queue_status(cmd);
3283 if (ret)
3284 goto out;
3285 }
07bde79a
NB		 3286
3287 switch (cmd->data_direction) {
3288 case DMA_FROM_DEVICE:
3289 ret = cmd->se_tfo->queue_data_in(cmd);
3290 break;
3291 case DMA_TO_DEVICE:
ec98f782 3292 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3293 ret = cmd->se_tfo->queue_data_in(cmd);
3294 if (ret < 0)
e057f533 3295 break;
07bde79a
NB		 3296 }
3297 /* Fall through for DMA_TO_DEVICE */
3298 case DMA_NONE:
3299 ret = cmd->se_tfo->queue_status(cmd);
3300 break;
3301 default:
3302 break;
3303 }
3304
e057f533
CH		 3305out:
3306 if (ret < 0) {
3307 transport_handle_queue_full(cmd, cmd->se_dev);
3308 return;
3309 }
3310 transport_lun_remove_cmd(cmd);
3311 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3312}
3313
3314static void transport_handle_queue_full(
3315 struct se_cmd *cmd,
e057f533 3316 struct se_device *dev)
07bde79a
NB		 3317{
3318 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3319 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3320 atomic_inc(&dev->dev_qf_count);
3321 smp_mb__after_atomic_inc();
3322 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3323
3324 schedule_work(&cmd->se_dev->qf_work_queue);
3325}
3326
35e0e757 3327static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3328{
35e0e757 3329 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3330 int reason = 0, ret;
35e0e757 3331
c66ac9db
NB		 3332 /*
3333 * Check if we need to move delayed/dormant tasks from cmds on the
3334 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3335 * Attribute.
3336 */
5951146d 3337 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3338 transport_complete_task_attr(cmd);
07bde79a
NB		 3339 /*
3340 * Check to schedule QUEUE_FULL work, or execute an existing
3341 * cmd->transport_qf_callback()
3342 */
3343 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3344 schedule_work(&cmd->se_dev->qf_work_queue);
3345
c66ac9db
NB		 3346 /*
3347 * Check if we need to retrieve a sense buffer from
3348 * the struct se_cmd in question.
3349 */
3350 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3351 if (transport_get_sense_data(cmd) < 0)
3352 reason = TCM_NON_EXISTENT_LUN;
3353
3354 /*
3355 * Only set when an struct se_task->task_scsi_status returned
3356 * a non GOOD status.
3357 */
3358 if (cmd->scsi_status) {
07bde79a 3359 ret = transport_send_check_condition_and_sense(
c66ac9db 3360 cmd, reason, 1);
f147abb4 3361 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3362 goto queue_full;
3363
c66ac9db
NB		 3364 transport_lun_remove_cmd(cmd);
3365 transport_cmd_check_stop_to_fabric(cmd);
3366 return;
3367 }
3368 }
3369 /*
25985edc 3370 * Check for a callback, used by amongst other things
c66ac9db
NB		 3371 * XDWRITE_READ_10 emulation.
3372 */
3373 if (cmd->transport_complete_callback)
3374 cmd->transport_complete_callback(cmd);
3375
3376 switch (cmd->data_direction) {
3377 case DMA_FROM_DEVICE:
3378 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3379 if (cmd->se_lun->lun_sep) {
3380 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3381 cmd->data_length;
3382 }
3383 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3384
07bde79a 3385 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3386 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3387 goto queue_full;
c66ac9db
NB		 3388 break;
3389 case DMA_TO_DEVICE:
3390 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3391 if (cmd->se_lun->lun_sep) {
3392 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3393 cmd->data_length;
3394 }
3395 spin_unlock(&cmd->se_lun->lun_sep_lock);
3396 /*
3397 * Check if we need to send READ payload for BIDI-COMMAND
3398 */
ec98f782 3399 if (cmd->t_bidi_data_sg) {
c66ac9db 3400 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3401 if (cmd->se_lun->lun_sep) {
3402 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3403 cmd->data_length;
3404 }
3405 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3406 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3407 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3408 goto queue_full;
c66ac9db
NB		 3409 break;
3410 }
3411 /* Fall through for DMA_TO_DEVICE */
3412 case DMA_NONE:
07bde79a 3413 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3414 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3415 goto queue_full;
c66ac9db
NB		 3416 break;
3417 default:
3418 break;
3419 }
3420
3421 transport_lun_remove_cmd(cmd);
3422 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3423 return;
3424
3425queue_full:
6708bb27 3426 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3427 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3428 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3429 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3430}
3431
3432static void transport_free_dev_tasks(struct se_cmd *cmd)
3433{
3434 struct se_task *task, *task_tmp;
3435 unsigned long flags;
0c2cfe5f 3436 LIST_HEAD(dispose_list);
c66ac9db 3437
a1d8b49a 3438 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3439 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3440 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3441 if (!(task->task_flags & TF_ACTIVE))
3442 list_move_tail(&task->t_list, &dispose_list);
3443 }
3444 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3445
3446 while (!list_empty(&dispose_list)) {
3447 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3448
c66ac9db 3449 list_del(&task->t_list);
42bf829e 3450 cmd->se_dev->transport->free_task(task);
c66ac9db 3451 }
c66ac9db
NB		 3452}
3453
6708bb27 3454static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3455{
ec98f782 3456 struct scatterlist *sg;
ec98f782 3457 int count;
c66ac9db 3458
6708bb27
AG		 3459 for_each_sg(sgl, sg, nents, count)
3460 __free_page(sg_page(sg));
c66ac9db 3461
6708bb27
AG		 3462 kfree(sgl);
3463}
c66ac9db 3464
6708bb27
AG		 3465static inline void transport_free_pages(struct se_cmd *cmd)
3466{
3467 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3468 return;
3469
3470 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3471 cmd->t_data_sg = NULL;
3472 cmd->t_data_nents = 0;
c66ac9db 3473
6708bb27 3474 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3475 cmd->t_bidi_data_sg = NULL;
3476 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3477}
3478
e26d99ae
CH		 3479/**
3480 * transport_release_cmd - free a command
3481 * @cmd: command to free
3482 *
3483 * This routine unconditionally frees a command, and reference counting
3484 * or list removal must be done in the caller.
3485 */
3486static void transport_release_cmd(struct se_cmd *cmd)
3487{
3488 BUG_ON(!cmd->se_tfo);
3489
c8e31f26 3490 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 3491 core_tmr_release_req(cmd->se_tmr_req);
3492 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3493 kfree(cmd->t_task_cdb);
3494 /*
7481deb4
NB		 3495 * If this cmd has been setup with target_get_sess_cmd(), drop
3496 * the kref and call ->release_cmd() in kref callback.
e26d99ae 3497 */
7481deb4
NB		 3498 if (cmd->check_release != 0) {
3499 target_put_sess_cmd(cmd->se_sess, cmd);
3500 return;
3501 }
e26d99ae
CH		 3502 cmd->se_tfo->release_cmd(cmd);
3503}
3504
d3df7825
CH		 3505/**
3506 * transport_put_cmd - release a reference to a command
3507 * @cmd: command to release
3508 *
3509 * This routine releases our reference to the command and frees it if possible.
3510 */
39c05f32 3511static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3512{
3513 unsigned long flags;
4911e3cc 3514 int free_tasks = 0;
c66ac9db 3515
a1d8b49a 3516 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3517 if (atomic_read(&cmd->t_fe_count)) {
3518 if (!atomic_dec_and_test(&cmd->t_fe_count))
3519 goto out_busy;
3520 }
3521
3522 if (atomic_read(&cmd->t_se_count)) {
3523 if (!atomic_dec_and_test(&cmd->t_se_count))
3524 goto out_busy;
3525 }
3526
7d680f3b
CH		 3527 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3528 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
4911e3cc
CH		 3529 transport_all_task_dev_remove_state(cmd);
3530 free_tasks = 1;
c66ac9db 3531 }
a1d8b49a 3532 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3533
4911e3cc
CH		 3534 if (free_tasks != 0)
3535 transport_free_dev_tasks(cmd);
d3df7825 3536
c66ac9db 3537 transport_free_pages(cmd);
31afc39c 3538 transport_release_cmd(cmd);
39c05f32 3539 return;
4911e3cc
CH		 3540out_busy:
3541 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3542}
3543
c66ac9db 3544/*
ec98f782
AG		 3545 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3546 * allocating in the core.
c66ac9db
NB		 3547 * @cmd: Associated se_cmd descriptor
3548 * @mem: SGL style memory for TCM WRITE / READ
3549 * @sg_mem_num: Number of SGL elements
3550 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3551 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3552 *
3553 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3554 * of parameters.
3555 */
3556int transport_generic_map_mem_to_cmd(
3557 struct se_cmd *cmd,
5951146d
AG		 3558 struct scatterlist *sgl,
3559 u32 sgl_count,
3560 struct scatterlist *sgl_bidi,
3561 u32 sgl_bidi_count)
c66ac9db 3562{
5951146d 3563 if (!sgl || !sgl_count)
c66ac9db 3564 return 0;
c66ac9db 3565
c66ac9db
NB		 3566 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3567 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
fef58a60
NB		 3568 /*
3569 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3570 * scatterlists already have been set to follow what the fabric
3571 * passes for the original expected data transfer length.
3572 */
3573 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3574 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3575 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3576 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3577 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3578 return -EINVAL;
3579 }
c66ac9db 3580
ec98f782
AG		 3581 cmd->t_data_sg = sgl;
3582 cmd->t_data_nents = sgl_count;
c66ac9db 3583
ec98f782
AG		 3584 if (sgl_bidi && sgl_bidi_count) {
3585 cmd->t_bidi_data_sg = sgl_bidi;
3586 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3587 }
3588 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3589 }
3590
3591 return 0;
3592}
3593EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3594
4949314c 3595void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3596{
ec98f782 3597 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 3598 struct page **pages;
3599 int i;
05d1c7c0 3600
ec98f782 3601 BUG_ON(!sg);
05d1c7c0 3602 /*
ec98f782
AG		 3603 * We need to take into account a possible offset here for fabrics like
3604 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3605 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3606 */
4949314c
AG		 3607 if (!cmd->t_data_nents)
3608 return NULL;
3609 else if (cmd->t_data_nents == 1)
3610 return kmap(sg_page(sg)) + sg->offset;
3611
3612 /* >1 page. use vmap */
3613 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3614 if (!pages)
3615 return NULL;
3616
3617 /* convert sg[] to pages[] */
3618 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3619 pages[i] = sg_page(sg);
3620 }
3621
3622 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
3623 kfree(pages);
3624 if (!cmd->t_data_vmap)
3625 return NULL;
3626
3627 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 3628}
4949314c 3629EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 3630
4949314c 3631void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3632{
a1edf9cf 3633 if (!cmd->t_data_nents) {
4949314c 3634 return;
a1edf9cf 3635 } else if (cmd->t_data_nents == 1) {
4949314c 3636 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 3637 return;
3638 }
4949314c
AG		 3639
3640 vunmap(cmd->t_data_vmap);
3641 cmd->t_data_vmap = NULL;
05d1c7c0 3642}
4949314c 3643EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 3644
c66ac9db 3645static int
05d1c7c0 3646transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3647{
ec98f782
AG		 3648 u32 length = cmd->data_length;
3649 unsigned int nents;
3650 struct page *page;
9db9da33 3651 gfp_t zero_flag;
ec98f782 3652 int i = 0;
c66ac9db 3653
ec98f782
AG		 3654 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3655 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3656 if (!cmd->t_data_sg)
3657 return -ENOMEM;
c66ac9db 3658
ec98f782
AG		 3659 cmd->t_data_nents = nents;
3660 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3661
9db9da33 3662 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3663
ec98f782
AG		 3664 while (length) {
3665 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 3666 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 3667 if (!page)
3668 goto out;
c66ac9db 3669
ec98f782
AG		 3670 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3671 length -= page_len;
3672 i++;
c66ac9db 3673 }
c66ac9db 3674 return 0;
c66ac9db 3675
ec98f782
AG		 3676out:
3677 while (i >= 0) {
3678 __free_page(sg_page(&cmd->t_data_sg[i]));
3679 i--;
c66ac9db 3680 }
ec98f782
AG		 3681 kfree(cmd->t_data_sg);
3682 cmd->t_data_sg = NULL;
3683 return -ENOMEM;
c66ac9db
NB		 3684}
3685
a1d8b49a
AG		 3686/* Reduce sectors if they are too long for the device */
3687static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3688 struct se_device *dev,
3689 unsigned long long lba,
a1d8b49a 3690 sector_t sectors)
c66ac9db 3691{
a1d8b49a 3692 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3693
a1d8b49a
AG		 3694 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3695 if ((lba + sectors) > transport_dev_end_lba(dev))
3696 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3697
a1d8b49a 3698 return sectors;
c66ac9db
NB		 3699}
3700
a1d8b49a
AG		 3701/*
3702 * Break up cmd into chunks transport can handle
3703 */
38b40067
CH		 3704static int
3705transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3706 enum dma_data_direction data_direction,
38b40067 3707 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3708{
5951146d 3709 struct se_device *dev = cmd->se_dev;
bebe2fdc
CH		 3710 struct se_dev_attrib *attr = &dev->se_sub_dev->se_dev_attrib;
3711 sector_t sectors;
3712 struct se_task *task;
3713 unsigned long flags;
38b40067
CH		 3714
3715 if (transport_cmd_get_valid_sectors(cmd) < 0)
3716 return -EINVAL;
3717
bebe2fdc 3718 sectors = DIV_ROUND_UP(cmd->data_length, attr->block_size);
c66ac9db 3719
bebe2fdc
CH		 3720 BUG_ON(cmd->data_length % attr->block_size);
3721 BUG_ON(sectors > attr->max_sectors);
ec98f782 3722
bebe2fdc
CH		 3723 task = transport_generic_get_task(cmd, data_direction);
3724 if (!task)
3725 return -ENOMEM;
ec98f782 3726
bebe2fdc
CH		 3727 task->task_sg = cmd_sg;
3728 task->task_sg_nents = sgl_nents;
3729 task->task_size = cmd->data_length;
c66ac9db 3730
bebe2fdc
CH		 3731 task->task_lba = cmd->t_task_lba;
3732 task->task_sectors = sectors;
c66ac9db 3733
bebe2fdc
CH		 3734 spin_lock_irqsave(&cmd->t_state_lock, flags);
3735 list_add_tail(&task->t_list, &cmd->t_task_list);
3736 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3737
bebe2fdc 3738 return 1;
c66ac9db
NB		 3739}
3740
3741static int
ec98f782 3742transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3743{
c66ac9db 3744 struct se_task *task;
ec98f782 3745 unsigned long flags;
c66ac9db 3746
91ec1d35
NB		 3747 /* Workaround for handling zero-length control CDBs */
3748 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3749 !cmd->data_length)
3750 return 0;
3751
c66ac9db
NB		 3752 task = transport_generic_get_task(cmd, cmd->data_direction);
3753 if (!task)
ec98f782 3754 return -ENOMEM;
c66ac9db 3755
af3f00c7 3756 task->task_sg = cmd->t_data_sg;
c66ac9db 3757 task->task_size = cmd->data_length;
6708bb27 3758 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3759
ec98f782
AG		 3760 spin_lock_irqsave(&cmd->t_state_lock, flags);
3761 list_add_tail(&task->t_list, &cmd->t_task_list);
3762 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3763
6708bb27 3764 /* Success! Return number of tasks allocated */
a3eedc22 3765 return 1;
ec98f782
AG		 3766}
3767
da0f7619 3768/*
b16a35b0
AG		 3769 * Allocate any required resources to execute the command. For writes we
3770 * might not have the payload yet, so notify the fabric via a call to
3771 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 3772 */
a1d8b49a 3773int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3774{
da0f7619 3775 struct se_device *dev = cmd->se_dev;
9ac54987 3776 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3777 int set_counts = 1;
c66ac9db
NB		 3778 int ret = 0;
3779
3780 /*
3781 * Determine is the TCM fabric module has already allocated physical
3782 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3783 * beforehand.
c66ac9db 3784 */
ec98f782
AG		 3785 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3786 cmd->data_length) {
05d1c7c0 3787 ret = transport_generic_get_mem(cmd);
c66ac9db 3788 if (ret < 0)
03e98c9e 3789 goto out_fail;
c66ac9db 3790 }
da0f7619 3791
1d20bb61 3792 /*
38b40067 3793 * For BIDI command set up the read tasks first.
1d20bb61 3794 */
da0f7619 3795 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3796 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3797 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3798
9ac54987
NB		 3799 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3800 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3801 cmd->t_bidi_data_nents);
3802 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3803 goto out_fail;
3804
3805 atomic_inc(&cmd->t_fe_count);
3806 atomic_inc(&cmd->t_se_count);
3807 set_counts = 0;
3808 }
38b40067
CH		 3809
3810 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3811 task_cdbs = transport_allocate_data_tasks(cmd,
3812 cmd->data_direction, cmd->t_data_sg,
3813 cmd->t_data_nents);
3814 } else {
3815 task_cdbs = transport_allocate_control_task(cmd);
3816 }
3817
410f6702 3818 if (task_cdbs < 0)
da0f7619 3819 goto out_fail;
410f6702 3820 else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
7d680f3b 3821 spin_lock_irq(&cmd->t_state_lock);
410f6702 3822 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 3823 cmd->transport_state |= CMD_T_ACTIVE;
3824 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 3825
3826 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3827 u8 ua_asc = 0, ua_ascq = 0;
3828
3829 core_scsi3_ua_clear_for_request_sense(cmd,
3830 &ua_asc, &ua_ascq);
3831 }
3832
410f6702
RD		 3833 INIT_WORK(&cmd->work, target_complete_ok_work);
3834 queue_work(target_completion_wq, &cmd->work);
3835 return 0;
3836 }
da0f7619
CH		 3837
3838 if (set_counts) {
3839 atomic_inc(&cmd->t_fe_count);
3840 atomic_inc(&cmd->t_se_count);
3841 }
3842
9ac54987
NB		 3843 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3844 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3845 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3846
c66ac9db 3847 /*
a1d8b49a 3848 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3849 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3850 * will be added to the struct se_device execution queue after its WRITE
3851 * data has arrived. (ie: It gets handled by the transport processing
3852 * thread a second time)
3853 */
3854 if (cmd->data_direction == DMA_TO_DEVICE) {
3855 transport_add_tasks_to_state_queue(cmd);
3856 return transport_generic_write_pending(cmd);
3857 }
3858 /*
3859 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3860 * to the execution queue.
3861 */
3862 transport_execute_tasks(cmd);
3863 return 0;
da0f7619
CH		 3864
3865out_fail:
3866 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3867 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3868 return -EINVAL;
c66ac9db 3869}
a1d8b49a 3870EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3871
3872/* transport_generic_process_write():
3873 *
3874 *
3875 */
3876void transport_generic_process_write(struct se_cmd *cmd)
3877{
c66ac9db
NB		 3878 transport_execute_tasks(cmd);
3879}
3880EXPORT_SYMBOL(transport_generic_process_write);
3881
e057f533 3882static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3883{
f147abb4
NB		 3884 int ret;
3885
3886 ret = cmd->se_tfo->write_pending(cmd);
3887 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3888 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3889 cmd);
3890 transport_handle_queue_full(cmd, cmd->se_dev);
3891 }
07bde79a
NB		 3892}
3893
c66ac9db
NB		 3894static int transport_generic_write_pending(struct se_cmd *cmd)
3895{
3896 unsigned long flags;
3897 int ret;
3898
a1d8b49a 3899 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3900 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3901 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3902
c66ac9db
NB		 3903 /*
3904 * Clear the se_cmd for WRITE_PENDING status in order to set
7d680f3b
CH		 3905 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3906 * from HW target mode interrupt code. This is safe to be called
3907 * with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3908 * because the se_cmd->se_lun pointer is not being cleared.
3909 */
3910 transport_cmd_check_stop(cmd, 1, 0);
3911
3912 /*
3913 * Call the fabric write_pending function here to let the
3914 * frontend know that WRITE buffers are ready.
3915 */
e3d6f909 3916 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3917 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3918 goto queue_full;
3919 else if (ret < 0)
c66ac9db
NB		 3920 return ret;
3921
03e98c9e 3922 return 1;
07bde79a
NB		 3923
3924queue_full:
6708bb27 3925 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3926 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3927 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3928 return 0;
c66ac9db
NB		 3929}
3930
39c05f32 3931void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3932{
d14921d6 3933 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 3934 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 3935 transport_wait_for_tasks(cmd);
3936
35462975 3937 transport_release_cmd(cmd);
d14921d6
NB		 3938 } else {
3939 if (wait_for_tasks)
3940 transport_wait_for_tasks(cmd);
3941
c66ac9db
NB		 3942 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3943
82f1c8a4 3944 if (cmd->se_lun)
c66ac9db 3945 transport_lun_remove_cmd(cmd);
c66ac9db 3946
f4366772
NB		 3947 transport_free_dev_tasks(cmd);
3948
39c05f32 3949 transport_put_cmd(cmd);
c66ac9db
NB		 3950 }
3951}
3952EXPORT_SYMBOL(transport_generic_free_cmd);
3953
a17f091d
NB		 3954/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3955 * @se_sess: session to reference
3956 * @se_cmd: command descriptor to add
a6360785 3957 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 3958 */
a6360785
NB		 3959void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3960 bool ack_kref)
a17f091d
NB		 3961{
3962 unsigned long flags;
3963
7481deb4 3964 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 3965 /*
3966 * Add a second kref if the fabric caller is expecting to handle
3967 * fabric acknowledgement that requires two target_put_sess_cmd()
3968 * invocations before se_cmd descriptor release.
3969 */
86715569 3970 if (ack_kref == true) {
a6360785 3971 kref_get(&se_cmd->cmd_kref);
86715569
NB		 3972 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
3973 }
7481deb4 3974
a17f091d
NB		 3975 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3976 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3977 se_cmd->check_release = 1;
3978 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3979}
3980EXPORT_SYMBOL(target_get_sess_cmd);
3981
7481deb4 3982static void target_release_cmd_kref(struct kref *kref)
a17f091d 3983{
7481deb4
NB		 3984 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3985 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 3986 unsigned long flags;
3987
3988 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3989 if (list_empty(&se_cmd->se_cmd_list)) {
3990 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 3991 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 3992 return;
a17f091d 3993 }
a17f091d
NB		 3994 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3995 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3996 complete(&se_cmd->cmd_wait_comp);
7481deb4 3997 return;
a17f091d
NB		 3998 }
3999 list_del(&se_cmd->se_cmd_list);
4000 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4001
7481deb4
NB		 4002 se_cmd->se_tfo->release_cmd(se_cmd);
4003}
4004
4005/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4006 * @se_sess: session to reference
4007 * @se_cmd: command descriptor to drop
4008 */
4009int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4010{
4011 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 4012}
4013EXPORT_SYMBOL(target_put_sess_cmd);
4014
4015/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4016 * @se_sess: session to split
4017 */
4018void target_splice_sess_cmd_list(struct se_session *se_sess)
4019{
4020 struct se_cmd *se_cmd;
4021 unsigned long flags;
4022
4023 WARN_ON(!list_empty(&se_sess->sess_wait_list));
4024 INIT_LIST_HEAD(&se_sess->sess_wait_list);
4025
4026 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4027 se_sess->sess_tearing_down = 1;
4028
4029 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4030
4031 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4032 se_cmd->cmd_wait_set = 1;
4033
4034 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4035}
4036EXPORT_SYMBOL(target_splice_sess_cmd_list);
4037
4038/* target_wait_for_sess_cmds - Wait for outstanding descriptors
4039 * @se_sess: session to wait for active I/O
4040 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4041 */
4042void target_wait_for_sess_cmds(
4043 struct se_session *se_sess,
4044 int wait_for_tasks)
4045{
4046 struct se_cmd *se_cmd, *tmp_cmd;
4047 bool rc = false;
4048
4049 list_for_each_entry_safe(se_cmd, tmp_cmd,
4050 &se_sess->sess_wait_list, se_cmd_list) {
4051 list_del(&se_cmd->se_cmd_list);
4052
4053 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4054 " %d\n", se_cmd, se_cmd->t_state,
4055 se_cmd->se_tfo->get_cmd_state(se_cmd));
4056
4057 if (wait_for_tasks) {
4058 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4059 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4060 se_cmd->se_tfo->get_cmd_state(se_cmd));
4061
4062 rc = transport_wait_for_tasks(se_cmd);
4063
4064 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4065 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4066 se_cmd->se_tfo->get_cmd_state(se_cmd));
4067 }
4068
4069 if (!rc) {
4070 wait_for_completion(&se_cmd->cmd_wait_comp);
4071 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4072 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4073 se_cmd->se_tfo->get_cmd_state(se_cmd));
4074 }
4075
4076 se_cmd->se_tfo->release_cmd(se_cmd);
4077 }
4078}
4079EXPORT_SYMBOL(target_wait_for_sess_cmds);
4080
c66ac9db
NB		 4081/* transport_lun_wait_for_tasks():
4082 *
4083 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4084 * an struct se_lun to be successfully shutdown.
4085 */
4086static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4087{
4088 unsigned long flags;
4089 int ret;
4090 /*
4091 * If the frontend has already requested this struct se_cmd to
4092 * be stopped, we can safely ignore this struct se_cmd.
4093 */
a1d8b49a 4094 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 4095 if (cmd->transport_state & CMD_T_STOP) {
4096 cmd->transport_state &= ~CMD_T_LUN_STOP;
4097
4098 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
4099 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4100 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4101 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4102 return -EPERM;
c66ac9db 4103 }
7d680f3b 4104 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 4105 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4106
5951146d 4107 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4108
4109 ret = transport_stop_tasks_for_cmd(cmd);
4110
6708bb27
AG		 4111 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4112 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4113 if (!ret) {
6708bb27 4114 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4115 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4116 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4117 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4118 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4119 }
3df8d40b 4120 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4121
4122 return 0;
4123}
4124
c66ac9db
NB		 4125static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4126{
4127 struct se_cmd *cmd = NULL;
4128 unsigned long lun_flags, cmd_flags;
4129 /*
4130 * Do exception processing and return CHECK_CONDITION status to the
4131 * Initiator Port.
4132 */
4133 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4134 while (!list_empty(&lun->lun_cmd_list)) {
4135 cmd = list_first_entry(&lun->lun_cmd_list,
4136 struct se_cmd, se_lun_node);
3d26fea0 4137 list_del_init(&cmd->se_lun_node);
5951146d 4138
c66ac9db
NB		 4139 /*
4140 * This will notify iscsi_target_transport.c:
4141 * transport_cmd_check_stop() that a LUN shutdown is in
4142 * progress for the iscsi_cmd_t.
4143 */
a1d8b49a 4144 spin_lock(&cmd->t_state_lock);
6708bb27 4145 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4146 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4147 cmd->se_lun->unpacked_lun,
4148 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 4149 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 4150 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4151
4152 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4153
6708bb27
AG		 4154 if (!cmd->se_lun) {
4155 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4156 cmd->se_tfo->get_task_tag(cmd),
4157 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4158 BUG();
4159 }
4160 /*
4161 * If the Storage engine still owns the iscsi_cmd_t, determine
4162 * and/or stop its context.
4163 */
6708bb27 4164 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4165 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4166 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4167
e3d6f909 4168 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4169 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4170 continue;
4171 }
4172
6708bb27 4173 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4174 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4175 cmd->se_lun->unpacked_lun,
4176 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4177
a1d8b49a 4178 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 4179 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 4180 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4181 goto check_cond;
4182 }
7d680f3b 4183 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
c66ac9db 4184 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4185 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4186
4187 transport_free_dev_tasks(cmd);
4188 /*
4189 * The Storage engine stopped this struct se_cmd before it was
4190 * send to the fabric frontend for delivery back to the
4191 * Initiator Node. Return this SCSI CDB back with an
4192 * CHECK_CONDITION status.
4193 */
4194check_cond:
4195 transport_send_check_condition_and_sense(cmd,
4196 TCM_NON_EXISTENT_LUN, 0);
4197 /*
4198 * If the fabric frontend is waiting for this iscsi_cmd_t to
4199 * be released, notify the waiting thread now that LU has
4200 * finished accessing it.
4201 */
a1d8b49a 4202 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 4203 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 4204 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4205 " struct se_cmd: %p ITT: 0x%08x\n",
4206 lun->unpacked_lun,
e3d6f909 4207 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4208
a1d8b49a 4209 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4210 cmd_flags);
4211 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4212 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4213 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4214 continue;
4215 }
6708bb27 4216 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4217 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4218
a1d8b49a 4219 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4220 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4221 }
4222 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4223}
4224
4225static int transport_clear_lun_thread(void *p)
4226{
8359cf43 4227 struct se_lun *lun = p;
c66ac9db
NB		 4228
4229 __transport_clear_lun_from_sessions(lun);
4230 complete(&lun->lun_shutdown_comp);
4231
4232 return 0;
4233}
4234
4235int transport_clear_lun_from_sessions(struct se_lun *lun)
4236{
4237 struct task_struct *kt;
4238
5951146d 4239 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4240 "tcm_cl_%u", lun->unpacked_lun);
4241 if (IS_ERR(kt)) {
6708bb27 4242 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4243 return PTR_ERR(kt);
c66ac9db
NB		 4244 }
4245 wait_for_completion(&lun->lun_shutdown_comp);
4246
4247 return 0;
4248}
4249
d14921d6
NB		 4250/**
4251 * transport_wait_for_tasks - wait for completion to occur
4252 * @cmd: command to wait
c66ac9db 4253 *
d14921d6
NB		 4254 * Called from frontend fabric context to wait for storage engine
4255 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4256 */
a17f091d 4257bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4258{
4259 unsigned long flags;
4260
a1d8b49a 4261 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 4262 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
4263 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 4264 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4265 return false;
d14921d6
NB		 4266 }
4267 /*
4268 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4269 * has been set in transport_set_supported_SAM_opcode().
4270 */
c8e31f26
AG		 4271 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
4272 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 4273 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4274 return false;
d14921d6 4275 }
c66ac9db
NB		 4276 /*
4277 * If we are already stopped due to an external event (ie: LUN shutdown)
4278 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4279 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4280 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4281 * has completed its operation on the struct se_cmd.
4282 */
7d680f3b 4283 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 4284 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4285 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4286 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4287 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4288 /*
4289 * There is a special case for WRITES where a FE exception +
4290 * LUN shutdown means ConfigFS context is still sleeping on
4291 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4292 * We go ahead and up transport_lun_stop_comp just to be sure
4293 * here.
4294 */
a1d8b49a
AG		 4295 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4296 complete(&cmd->transport_lun_stop_comp);
4297 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4298 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4299
4300 transport_all_task_dev_remove_state(cmd);
4301 /*
4302 * At this point, the frontend who was the originator of this
4303 * struct se_cmd, now owns the structure and can be released through
4304 * normal means below.
4305 */
6708bb27 4306 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4307 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4308 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4309 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4310
7d680f3b 4311 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 4312 }
7d680f3b 4313
3d28934a 4314 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 4315 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4316 return false;
d14921d6 4317 }
c66ac9db 4318
7d680f3b 4319 cmd->transport_state |= CMD_T_STOP;
c66ac9db 4320
6708bb27 4321 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 4322 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 4323 cmd, cmd->se_tfo->get_task_tag(cmd),
4324 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4325
a1d8b49a 4326 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4327
5951146d 4328 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4329
a1d8b49a 4330 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4331
a1d8b49a 4332 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 4333 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 4334
6708bb27 4335 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4336 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4337 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4338
d14921d6 4339 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4340
4341 return true;
c66ac9db 4342}
d14921d6 4343EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4344
4345static int transport_get_sense_codes(
4346 struct se_cmd *cmd,
4347 u8 *asc,
4348 u8 *ascq)
4349{
4350 *asc = cmd->scsi_asc;
4351 *ascq = cmd->scsi_ascq;
4352
4353 return 0;
4354}
4355
4356static int transport_set_sense_codes(
4357 struct se_cmd *cmd,
4358 u8 asc,
4359 u8 ascq)
4360{
4361 cmd->scsi_asc = asc;
4362 cmd->scsi_ascq = ascq;
4363
4364 return 0;
4365}
4366
4367int transport_send_check_condition_and_sense(
4368 struct se_cmd *cmd,
4369 u8 reason,
4370 int from_transport)
4371{
4372 unsigned char *buffer = cmd->sense_buffer;
4373 unsigned long flags;
4374 int offset;
4375 u8 asc = 0, ascq = 0;
4376
a1d8b49a 4377 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4378 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4379 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4380 return 0;
4381 }
4382 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4383 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4384
4385 if (!reason && from_transport)
4386 goto after_reason;
4387
4388 if (!from_transport)
4389 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4390 /*
4391 * Data Segment and SenseLength of the fabric response PDU.
4392 *
4393 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4394 * from include/scsi/scsi_cmnd.h
4395 */
e3d6f909 4396 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4397 TRANSPORT_SENSE_BUFFER);
4398 /*
4399 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4400 * SENSE KEY values from include/scsi/scsi.h
4401 */
4402 switch (reason) {
4403 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4404 /* CURRENT ERROR */
4405 buffer[offset] = 0x70;
895f3022 4406 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 4407 /* ILLEGAL REQUEST */
4408 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4409 /* LOGICAL UNIT NOT SUPPORTED */
4410 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4411 break;
c66ac9db
NB		 4412 case TCM_UNSUPPORTED_SCSI_OPCODE:
4413 case TCM_SECTOR_COUNT_TOO_MANY:
4414 /* CURRENT ERROR */
4415 buffer[offset] = 0x70;
895f3022 4416 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4417 /* ILLEGAL REQUEST */
4418 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4419 /* INVALID COMMAND OPERATION CODE */
4420 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4421 break;
4422 case TCM_UNKNOWN_MODE_PAGE:
4423 /* CURRENT ERROR */
4424 buffer[offset] = 0x70;
895f3022 4425 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4426 /* ILLEGAL REQUEST */
4427 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4428 /* INVALID FIELD IN CDB */
4429 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4430 break;
4431 case TCM_CHECK_CONDITION_ABORT_CMD:
4432 /* CURRENT ERROR */
4433 buffer[offset] = 0x70;
895f3022 4434 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4435 /* ABORTED COMMAND */
4436 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4437 /* BUS DEVICE RESET FUNCTION OCCURRED */
4438 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4439 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4440 break;
4441 case TCM_INCORRECT_AMOUNT_OF_DATA:
4442 /* CURRENT ERROR */
4443 buffer[offset] = 0x70;
895f3022 4444 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4445 /* ABORTED COMMAND */
4446 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4447 /* WRITE ERROR */
4448 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4449 /* NOT ENOUGH UNSOLICITED DATA */
4450 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4451 break;
4452 case TCM_INVALID_CDB_FIELD:
4453 /* CURRENT ERROR */
4454 buffer[offset] = 0x70;
895f3022 4455 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4456 /* ILLEGAL REQUEST */
4457 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4458 /* INVALID FIELD IN CDB */
4459 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4460 break;
4461 case TCM_INVALID_PARAMETER_LIST:
4462 /* CURRENT ERROR */
4463 buffer[offset] = 0x70;
895f3022 4464 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4465 /* ILLEGAL REQUEST */
4466 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4467 /* INVALID FIELD IN PARAMETER LIST */
4468 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4469 break;
4470 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4471 /* CURRENT ERROR */
4472 buffer[offset] = 0x70;
895f3022 4473 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4474 /* ABORTED COMMAND */
4475 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4476 /* WRITE ERROR */
4477 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4478 /* UNEXPECTED_UNSOLICITED_DATA */
4479 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4480 break;
4481 case TCM_SERVICE_CRC_ERROR:
4482 /* CURRENT ERROR */
4483 buffer[offset] = 0x70;
895f3022 4484 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4485 /* ABORTED COMMAND */
4486 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4487 /* PROTOCOL SERVICE CRC ERROR */
4488 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4489 /* N/A */
4490 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4491 break;
4492 case TCM_SNACK_REJECTED:
4493 /* CURRENT ERROR */
4494 buffer[offset] = 0x70;
895f3022 4495 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4496 /* ABORTED COMMAND */
4497 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4498 /* READ ERROR */
4499 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4500 /* FAILED RETRANSMISSION REQUEST */
4501 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4502 break;
4503 case TCM_WRITE_PROTECTED:
4504 /* CURRENT ERROR */
4505 buffer[offset] = 0x70;
895f3022 4506 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4507 /* DATA PROTECT */
4508 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4509 /* WRITE PROTECTED */
4510 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4511 break;
4512 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4513 /* CURRENT ERROR */
4514 buffer[offset] = 0x70;
895f3022 4515 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4516 /* UNIT ATTENTION */
4517 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4518 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4519 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4520 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4521 break;
4522 case TCM_CHECK_CONDITION_NOT_READY:
4523 /* CURRENT ERROR */
4524 buffer[offset] = 0x70;
895f3022 4525 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4526 /* Not Ready */
4527 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4528 transport_get_sense_codes(cmd, &asc, &ascq);
4529 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4530 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4531 break;
4532 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4533 default:
4534 /* CURRENT ERROR */
4535 buffer[offset] = 0x70;
895f3022 4536 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4537 /* ILLEGAL REQUEST */
4538 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4539 /* LOGICAL UNIT COMMUNICATION FAILURE */
4540 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4541 break;
4542 }
4543 /*
4544 * This code uses linux/include/scsi/scsi.h SAM status codes!
4545 */
4546 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4547 /*
4548 * Automatically padded, this value is encoded in the fabric's
4549 * data_length response PDU containing the SCSI defined sense data.
4550 */
4551 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4552
4553after_reason:
07bde79a 4554 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4555}
4556EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4557
4558int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4559{
4560 int ret = 0;
4561
7d680f3b 4562 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 4563 if (!send_status ||
c66ac9db
NB		 4564 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4565 return 1;
8b1e1244 4566
6708bb27 4567 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4568 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4569 cmd->t_task_cdb[0],
e3d6f909 4570 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 4571
c66ac9db 4572 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4573 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4574 ret = 1;
4575 }
4576 return ret;
4577}
4578EXPORT_SYMBOL(transport_check_aborted_status);
4579
4580void transport_send_task_abort(struct se_cmd *cmd)
4581{
c252f003
NB		 4582 unsigned long flags;
4583
4584 spin_lock_irqsave(&cmd->t_state_lock, flags);
4585 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4586 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4587 return;
4588 }
4589 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4590
c66ac9db
NB		 4591 /*
4592 * If there are still expected incoming fabric WRITEs, we wait
4593 * until until they have completed before sending a TASK_ABORTED
4594 * response. This response with TASK_ABORTED status will be
4595 * queued back to fabric module by transport_check_aborted_status().
4596 */
4597 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4598 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 4599 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 4600 smp_mb__after_atomic_inc();
c66ac9db
NB		 4601 }
4602 }
4603 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 4604
6708bb27 4605 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4606 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4607 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 4608
e3d6f909 4609 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4610}
4611
e26d99ae 4612static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4613{
5951146d 4614 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4615 struct se_tmr_req *tmr = cmd->se_tmr_req;
4616 int ret;
4617
4618 switch (tmr->function) {
5c6cd613 4619 case TMR_ABORT_TASK:
3d28934a 4620 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 4621 break;
5c6cd613
NB		 4622 case TMR_ABORT_TASK_SET:
4623 case TMR_CLEAR_ACA:
4624 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4625 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4626 break;
5c6cd613 4627 case TMR_LUN_RESET:
c66ac9db
NB		 4628 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4629 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4630 TMR_FUNCTION_REJECTED;
4631 break;
5c6cd613 4632 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4633 tmr->response = TMR_FUNCTION_REJECTED;
4634 break;
5c6cd613 4635 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4636 tmr->response = TMR_FUNCTION_REJECTED;
4637 break;
c66ac9db 4638 default:
6708bb27 4639 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4640 tmr->function);
4641 tmr->response = TMR_FUNCTION_REJECTED;
4642 break;
4643 }
4644
4645 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4646 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4647
b7b8bef7 4648 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4649 return 0;
4650}
4651
c66ac9db
NB		 4652/* transport_processing_thread():
4653 *
4654 *
4655 */
4656static int transport_processing_thread(void *param)
4657{
5951146d 4658 int ret;
c66ac9db 4659 struct se_cmd *cmd;
8359cf43 4660 struct se_device *dev = param;
c66ac9db 4661
c66ac9db 4662 while (!kthread_should_stop()) {
e3d6f909
AG		 4663 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4664 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4665 kthread_should_stop());
4666 if (ret < 0)
4667 goto out;
4668
c66ac9db 4669get_cmd:
5951146d
AG		 4670 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4671 if (!cmd)
c66ac9db
NB		 4672 continue;
4673
5951146d 4674 switch (cmd->t_state) {
680b73c5
CH		 4675 case TRANSPORT_NEW_CMD:
4676 BUG();
4677 break;
c66ac9db 4678 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4679 if (!cmd->se_tfo->new_cmd_map) {
4680 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4681 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4682 BUG();
4683 }
e3d6f909 4684 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4685 if (ret < 0) {
03e98c9e 4686 transport_generic_request_failure(cmd);
c66ac9db
NB		 4687 break;
4688 }
c66ac9db 4689 ret = transport_generic_new_cmd(cmd);
f147abb4 4690 if (ret < 0) {
03e98c9e
NB		 4691 transport_generic_request_failure(cmd);
4692 break;
c66ac9db
NB		 4693 }
4694 break;
4695 case TRANSPORT_PROCESS_WRITE:
4696 transport_generic_process_write(cmd);
4697 break;
c66ac9db
NB		 4698 case TRANSPORT_PROCESS_TMR:
4699 transport_generic_do_tmr(cmd);
4700 break;
07bde79a 4701 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4702 transport_write_pending_qf(cmd);
4703 break;
4704 case TRANSPORT_COMPLETE_QF_OK:
4705 transport_complete_qf(cmd);
07bde79a 4706 break;
c66ac9db 4707 default:
f2da9dbd
CH		 4708 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4709 "i_state: %d on SE LUN: %u\n",
4710 cmd->t_state,
e3d6f909
AG		 4711 cmd->se_tfo->get_task_tag(cmd),
4712 cmd->se_tfo->get_cmd_state(cmd),
4713 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4714 BUG();
4715 }
4716
4717 goto get_cmd;
4718 }
4719
4720out:
ce8762f6
NB		 4721 WARN_ON(!list_empty(&dev->state_task_list));
4722 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4723 dev->process_thread = NULL;
4724 return 0;
4725}
Linux kernel - Deliverables
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