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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[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
c66ac9db
NB		 1553/* transport_generic_allocate_tasks():
1554 *
1555 * Called from fabric RX Thread.
1556 */
1557int transport_generic_allocate_tasks(
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}
1623EXPORT_SYMBOL(transport_generic_allocate_tasks);
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);
1704 /*
1705 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1706 * se_sess->sess_cmd_list. A second kref_get here is necessary
1707 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1708 * kref_put() to happen during fabric packet acknowledgement.
1709 */
1710 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1711 /*
1712 * Signal bidirectional data payloads to target-core
1713 */
1714 if (flags & TARGET_SCF_BIDI_OP)
1715 se_cmd->se_cmd_flags |= SCF_BIDI;
1716 /*
1717 * Locate se_lun pointer and attach it to struct se_cmd
1718 */
735703ca
NB		 1719 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1720 transport_send_check_condition_and_sense(se_cmd,
1721 se_cmd->scsi_sense_reason, 0);
1722 target_put_sess_cmd(se_sess, se_cmd);
1723 return;
1724 }
a6360785
NB		 1725 /*
1726 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1727 * allocate the necessary tasks to complete the received CDB+data
1728 */
1729 rc = transport_generic_allocate_tasks(se_cmd, cdb);
735703ca
NB		 1730 if (rc != 0) {
1731 transport_generic_request_failure(se_cmd);
1732 return;
1733 }
a6360785
NB		 1734 /*
1735 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1736 * for immediate execution of READs, otherwise wait for
1737 * transport_generic_handle_data() to be called for WRITEs
1738 * when fabric has filled the incoming buffer.
1739 */
1740 transport_handle_cdb_direct(se_cmd);
1edcdb49 1741 return;
a6360785
NB		 1742}
1743EXPORT_SYMBOL(target_submit_cmd);
1744
9f0d05c2
NB		 1745static void target_complete_tmr_failure(struct work_struct *work)
1746{
1747 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1748
1749 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1750 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1751 transport_generic_free_cmd(se_cmd, 0);
1752}
1753
ea98d7f9
AG		 1754/**
1755 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1756 * for TMR CDBs
1757 *
1758 * @se_cmd: command descriptor to submit
1759 * @se_sess: associated se_sess for endpoint
1760 * @sense: pointer to SCSI sense buffer
1761 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1762 * @fabric_context: fabric context for TMR req
1763 * @tm_type: Type of TM request
c0974f89
NB		 1764 * @gfp: gfp type for caller
1765 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1766 * @flags: submit cmd flags
ea98d7f9
AG		 1767 *
1768 * Callable from all contexts.
1769 **/
1770
c7042cae 1771int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1772 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1773 void *fabric_tmr_ptr, unsigned char tm_type,
1774 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1775{
1776 struct se_portal_group *se_tpg;
1777 int ret;
1778
1779 se_tpg = se_sess->se_tpg;
1780 BUG_ON(!se_tpg);
1781
1782 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1783 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1784 /*
1785 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1786 * allocation failure.
1787 */
c0974f89 1788 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1789 if (ret < 0)
1790 return -ENOMEM;
ea98d7f9 1791
c0974f89
NB		 1792 if (tm_type == TMR_ABORT_TASK)
1793 se_cmd->se_tmr_req->ref_task_tag = tag;
1794
ea98d7f9
AG		 1795 /* See target_submit_cmd for commentary */
1796 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1797
ea98d7f9
AG		 1798 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1799 if (ret) {
9f0d05c2
NB		 1800 /*
1801 * For callback during failure handling, push this work off
1802 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1803 */
1804 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1805 schedule_work(&se_cmd->work);
c7042cae 1806 return 0;
ea98d7f9
AG		 1807 }
1808 transport_generic_handle_tmr(se_cmd);
c7042cae 1809 return 0;
ea98d7f9
AG		 1810}
1811EXPORT_SYMBOL(target_submit_tmr);
1812
c66ac9db
NB		 1813/*
1814 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1815 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1816 * complete setup in TCM process context w/ TFO->new_cmd_map().
1817 */
1818int transport_generic_handle_cdb_map(
1819 struct se_cmd *cmd)
1820{
e3d6f909 1821 if (!cmd->se_lun) {
c66ac9db 1822 dump_stack();
6708bb27 1823 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1824 return -EINVAL;
c66ac9db
NB		 1825 }
1826
f7a5cc0b 1827 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1828 return 0;
1829}
1830EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1831
1832/* transport_generic_handle_data():
1833 *
1834 *
1835 */
1836int transport_generic_handle_data(
1837 struct se_cmd *cmd)
1838{
1839 /*
1840 * For the software fabric case, then we assume the nexus is being
1841 * failed/shutdown when signals are pending from the kthread context
1842 * caller, so we return a failure. For the HW target mode case running
1843 * in interrupt code, the signal_pending() check is skipped.
1844 */
1845 if (!in_interrupt() && signal_pending(current))
e3d6f909 1846 return -EPERM;
c66ac9db
NB		 1847 /*
1848 * If the received CDB has aleady been ABORTED by the generic
1849 * target engine, we now call transport_check_aborted_status()
1850 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1851 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1852 * sequences at this point.
1853 */
1854 if (transport_check_aborted_status(cmd, 1) != 0)
1855 return 0;
1856
f7a5cc0b 1857 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1858 return 0;
1859}
1860EXPORT_SYMBOL(transport_generic_handle_data);
1861
1862/* transport_generic_handle_tmr():
1863 *
1864 *
1865 */
1866int transport_generic_handle_tmr(
1867 struct se_cmd *cmd)
1868{
f7a5cc0b 1869 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1870 return 0;
1871}
1872EXPORT_SYMBOL(transport_generic_handle_tmr);
1873
cdbb70bb
CH		 1874/*
1875 * If the task is active, request it to be stopped and sleep until it
1876 * has completed.
1877 */
1878bool target_stop_task(struct se_task *task, unsigned long *flags)
1879{
1880 struct se_cmd *cmd = task->task_se_cmd;
1881 bool was_active = false;
1882
1883 if (task->task_flags & TF_ACTIVE) {
1884 task->task_flags |= TF_REQUEST_STOP;
1885 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1886
1887 pr_debug("Task %p waiting to complete\n", task);
1888 wait_for_completion(&task->task_stop_comp);
1889 pr_debug("Task %p stopped successfully\n", task);
1890
1891 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1892 atomic_dec(&cmd->t_task_cdbs_left);
1893 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1894 was_active = true;
1895 }
1896
cdbb70bb
CH		 1897 return was_active;
1898}
1899
c66ac9db
NB		 1900static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1901{
1902 struct se_task *task, *task_tmp;
1903 unsigned long flags;
1904 int ret = 0;
1905
6708bb27 1906 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1907 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1908
1909 /*
1910 * No tasks remain in the execution queue
1911 */
a1d8b49a 1912 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1913 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1914 &cmd->t_task_list, t_list) {
04629b7b 1915 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1916 /*
1917 * If the struct se_task has not been sent and is not active,
1918 * remove the struct se_task from the execution queue.
1919 */
6c76bf95 1920 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1921 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1922 flags);
1923 transport_remove_task_from_execute_queue(task,
42bf829e 1924 cmd->se_dev);
c66ac9db 1925
04629b7b 1926 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1927 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1928 continue;
1929 }
1930
cdbb70bb 1931 if (!target_stop_task(task, &flags)) {
04629b7b 1932 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1933 ret++;
1934 }
c66ac9db 1935 }
a1d8b49a 1936 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1937
1938 return ret;
1939}
1940
c66ac9db
NB		 1941/*
1942 * Handle SAM-esque emulation for generic transport request failures.
1943 */
2fbff127 1944void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1945{
07bde79a
NB		 1946 int ret = 0;
1947
6708bb27 1948 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1949 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1950 cmd->t_task_cdb[0]);
03e98c9e 1951 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1952 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1953 cmd->t_state, cmd->scsi_sense_reason);
6708bb27 1954 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db 1955 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
7d680f3b
CH		 1956 " CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1957 cmd->t_task_list_num,
a1d8b49a
AG		 1958 atomic_read(&cmd->t_task_cdbs_left),
1959 atomic_read(&cmd->t_task_cdbs_sent),
1960 atomic_read(&cmd->t_task_cdbs_ex_left),
7d680f3b
CH		 1961 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1962 (cmd->transport_state & CMD_T_STOP) != 0,
1963 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1964
c66ac9db
NB		 1965 /*
1966 * For SAM Task Attribute emulation for failed struct se_cmd
1967 */
1968 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1969 transport_complete_task_attr(cmd);
1970
03e98c9e
NB		 1971 switch (cmd->scsi_sense_reason) {
1972 case TCM_NON_EXISTENT_LUN:
1973 case TCM_UNSUPPORTED_SCSI_OPCODE:
1974 case TCM_INVALID_CDB_FIELD:
1975 case TCM_INVALID_PARAMETER_LIST:
1976 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1977 case TCM_UNKNOWN_MODE_PAGE:
1978 case TCM_WRITE_PROTECTED:
1979 case TCM_CHECK_CONDITION_ABORT_CMD:
1980 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1981 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1982 break;
03e98c9e 1983 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1984 /*
1985 * No SENSE Data payload for this case, set SCSI Status
1986 * and queue the response to $FABRIC_MOD.
1987 *
1988 * Uses linux/include/scsi/scsi.h SAM status codes defs
1989 */
1990 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1991 /*
1992 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1993 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1994 * CONFLICT STATUS.
1995 *
1996 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1997 */
e3d6f909
AG		 1998 if (cmd->se_sess &&
1999 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2000 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2001 cmd->orig_fe_lun, 0x2C,
2002 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2003
07bde79a 2004 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2005 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2006 goto queue_full;
c66ac9db 2007 goto check_stop;
c66ac9db 2008 default:
6708bb27 2009 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 2010 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 2011 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2012 break;
2013 }
16ab8e60
NB		 2014 /*
2015 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2016 * make the call to transport_send_check_condition_and_sense()
2017 * directly. Otherwise expect the fabric to make the call to
2018 * transport_send_check_condition_and_sense() after handling
2019 * possible unsoliticied write data payloads.
2020 */
03e98c9e
NB		 2021 ret = transport_send_check_condition_and_sense(cmd,
2022 cmd->scsi_sense_reason, 0);
2023 if (ret == -EAGAIN || ret == -ENOMEM)
2024 goto queue_full;
07bde79a 2025
c66ac9db
NB		 2026check_stop:
2027 transport_lun_remove_cmd(cmd);
6708bb27 2028 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 2029 ;
07bde79a
NB		 2030 return;
2031
2032queue_full:
e057f533
CH		 2033 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2034 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 2035}
2fbff127 2036EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 2037
c66ac9db
NB		 2038static inline u32 transport_lba_21(unsigned char *cdb)
2039{
2040 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2041}
2042
2043static inline u32 transport_lba_32(unsigned char *cdb)
2044{
2045 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2046}
2047
2048static inline unsigned long long transport_lba_64(unsigned char *cdb)
2049{
2050 unsigned int __v1, __v2;
2051
2052 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2053 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2054
2055 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2056}
2057
2058/*
2059 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2060 */
2061static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2062{
2063 unsigned int __v1, __v2;
2064
2065 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2066 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2067
2068 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2069}
2070
2071static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2072{
2073 unsigned long flags;
2074
a1d8b49a 2075 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2076 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2077 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2078}
2079
c66ac9db
NB		 2080/*
2081 * Called from Fabric Module context from transport_execute_tasks()
2082 *
2083 * The return of this function determins if the tasks from struct se_cmd
2084 * get added to the execution queue in transport_execute_tasks(),
2085 * or are added to the delayed or ordered lists here.
2086 */
2087static inline int transport_execute_task_attr(struct se_cmd *cmd)
2088{
5951146d 2089 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2090 return 1;
2091 /*
25985edc 2092 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2093 * to allow the passed struct se_cmd list of tasks to the front of the list.
2094 */
e66ecd50 2095 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
6708bb27 2096 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2097 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2098 cmd->t_task_cdb[0],
c66ac9db
NB		 2099 cmd->se_ordered_id);
2100 return 1;
e66ecd50 2101 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d 2102 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2103 smp_mb__after_atomic_inc();
2104
6708bb27 2105 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2106 " list, se_ordered_id: %u\n",
a1d8b49a 2107 cmd->t_task_cdb[0],
c66ac9db
NB		 2108 cmd->se_ordered_id);
2109 /*
2110 * Add ORDERED command to tail of execution queue if
2111 * no other older commands exist that need to be
2112 * completed first.
2113 */
6708bb27 2114 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2115 return 1;
2116 } else {
2117 /*
2118 * For SIMPLE and UNTAGGED Task Attribute commands
2119 */
5951146d 2120 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2121 smp_mb__after_atomic_inc();
2122 }
2123 /*
2124 * Otherwise if one or more outstanding ORDERED task attribute exist,
2125 * add the dormant task(s) built for the passed struct se_cmd to the
2126 * execution queue and become in Active state for this struct se_device.
2127 */
5951146d 2128 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2129 /*
2130 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2131 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2132 */
5951146d 2133 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2134 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2135 list_add_tail(&cmd->se_delayed_node,
2136 &cmd->se_dev->delayed_cmd_list);
2137 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2138
6708bb27 2139 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2140 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2141 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2142 cmd->se_ordered_id);
2143 /*
2144 * Return zero to let transport_execute_tasks() know
2145 * not to add the delayed tasks to the execution list.
2146 */
2147 return 0;
2148 }
2149 /*
2150 * Otherwise, no ORDERED task attributes exist..
2151 */
2152 return 1;
2153}
2154
2155/*
2156 * Called from fabric module context in transport_generic_new_cmd() and
2157 * transport_generic_process_write()
2158 */
2159static int transport_execute_tasks(struct se_cmd *cmd)
2160{
2161 int add_tasks;
40be67f4 2162 struct se_device *se_dev = cmd->se_dev;
c66ac9db
NB		 2163 /*
2164 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2165 * has occurred that prevents execution.
c66ac9db 2166 */
6708bb27 2167 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2168 /*
2169 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2170 * attribute for the tasks of the received struct se_cmd CDB
2171 */
2172 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2173 if (!add_tasks)
c66ac9db
NB		 2174 goto execute_tasks;
2175 /*
4d2300cc
NB		 2176 * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2177 * adds associated se_tasks while holding dev->execute_task_lock
2178 * before I/O dispath to avoid a double spinlock access.
c66ac9db 2179 */
4d2300cc
NB		 2180 __transport_execute_tasks(se_dev, cmd);
2181 return 0;
c66ac9db 2182 }
4d2300cc 2183
c66ac9db 2184execute_tasks:
4d2300cc 2185 __transport_execute_tasks(se_dev, NULL);
c66ac9db
NB		 2186 return 0;
2187}
2188
2189/*
2190 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2191 * from struct se_device->execute_task_list and
2192 *
2193 * Called from transport_processing_thread()
2194 */
4d2300cc 2195static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
c66ac9db
NB		 2196{
2197 int error;
2198 struct se_cmd *cmd = NULL;
e3d6f909 2199 struct se_task *task = NULL;
c66ac9db
NB		 2200 unsigned long flags;
2201
c66ac9db 2202check_depth:
e3d6f909 2203 spin_lock_irq(&dev->execute_task_lock);
4d2300cc
NB		 2204 if (new_cmd != NULL)
2205 __transport_add_tasks_from_cmd(new_cmd);
2206
e3d6f909
AG		 2207 if (list_empty(&dev->execute_task_list)) {
2208 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2209 return 0;
2210 }
e3d6f909
AG		 2211 task = list_first_entry(&dev->execute_task_list,
2212 struct se_task, t_execute_list);
04629b7b 2213 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2214 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db 2215
e3d6f909 2216 cmd = task->task_se_cmd;
a1d8b49a 2217 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2218 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2219 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2220
a1d8b49a
AG		 2221 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2222 cmd->t_task_list_num)
7d680f3b 2223 cmd->transport_state |= CMD_T_SENT;
c66ac9db 2224
a1d8b49a 2225 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2226
5bda90c8
CH		 2227 if (cmd->execute_task)
2228 error = cmd->execute_task(task);
2229 else
2230 error = dev->transport->do_task(task);
d29a5b6a 2231 if (error != 0) {
d29a5b6a
CH		 2232 spin_lock_irqsave(&cmd->t_state_lock, flags);
2233 task->task_flags &= ~TF_ACTIVE;
7d680f3b 2234 cmd->transport_state &= ~CMD_T_SENT;
d29a5b6a 2235 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
7d680f3b 2236
d29a5b6a 2237 transport_stop_tasks_for_cmd(cmd);
03e98c9e 2238 transport_generic_request_failure(cmd);
c66ac9db
NB		 2239 }
2240
4d2300cc 2241 new_cmd = NULL;
c66ac9db
NB		 2242 goto check_depth;
2243
2244 return 0;
2245}
2246
c66ac9db
NB		 2247static inline u32 transport_get_sectors_6(
2248 unsigned char *cdb,
2249 struct se_cmd *cmd,
2250 int *ret)
2251{
5951146d 2252 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2253
2254 /*
2255 * Assume TYPE_DISK for non struct se_device objects.
2256 * Use 8-bit sector value.
2257 */
2258 if (!dev)
2259 goto type_disk;
2260
2261 /*
2262 * Use 24-bit allocation length for TYPE_TAPE.
2263 */
e3d6f909 2264 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2265 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2266
2267 /*
2268 * Everything else assume TYPE_DISK Sector CDB location.
9b5cd7f3
RD		 2269 * Use 8-bit sector value. SBC-3 says:
2270 *
2271 * A TRANSFER LENGTH field set to zero specifies that 256
2272 * logical blocks shall be written. Any other value
2273 * specifies the number of logical blocks that shall be
2274 * written.
c66ac9db
NB		 2275 */
2276type_disk:
9b5cd7f3 2277 return cdb[4] ? : 256;
c66ac9db
NB		 2278}
2279
2280static inline u32 transport_get_sectors_10(
2281 unsigned char *cdb,
2282 struct se_cmd *cmd,
2283 int *ret)
2284{
5951146d 2285 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2286
2287 /*
2288 * Assume TYPE_DISK for non struct se_device objects.
2289 * Use 16-bit sector value.
2290 */
2291 if (!dev)
2292 goto type_disk;
2293
2294 /*
2295 * XXX_10 is not defined in SSC, throw an exception
2296 */
e3d6f909
AG		 2297 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2298 *ret = -EINVAL;
c66ac9db
NB		 2299 return 0;
2300 }
2301
2302 /*
2303 * Everything else assume TYPE_DISK Sector CDB location.
2304 * Use 16-bit sector value.
2305 */
2306type_disk:
2307 return (u32)(cdb[7] << 8) + cdb[8];
2308}
2309
2310static inline u32 transport_get_sectors_12(
2311 unsigned char *cdb,
2312 struct se_cmd *cmd,
2313 int *ret)
2314{
5951146d 2315 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2316
2317 /*
2318 * Assume TYPE_DISK for non struct se_device objects.
2319 * Use 32-bit sector value.
2320 */
2321 if (!dev)
2322 goto type_disk;
2323
2324 /*
2325 * XXX_12 is not defined in SSC, throw an exception
2326 */
e3d6f909
AG		 2327 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2328 *ret = -EINVAL;
c66ac9db
NB		 2329 return 0;
2330 }
2331
2332 /*
2333 * Everything else assume TYPE_DISK Sector CDB location.
2334 * Use 32-bit sector value.
2335 */
2336type_disk:
2337 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2338}
2339
2340static inline u32 transport_get_sectors_16(
2341 unsigned char *cdb,
2342 struct se_cmd *cmd,
2343 int *ret)
2344{
5951146d 2345 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2346
2347 /*
2348 * Assume TYPE_DISK for non struct se_device objects.
2349 * Use 32-bit sector value.
2350 */
2351 if (!dev)
2352 goto type_disk;
2353
2354 /*
2355 * Use 24-bit allocation length for TYPE_TAPE.
2356 */
e3d6f909 2357 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2358 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2359
2360type_disk:
2361 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2362 (cdb[12] << 8) + cdb[13];
2363}
2364
2365/*
2366 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2367 */
2368static inline u32 transport_get_sectors_32(
2369 unsigned char *cdb,
2370 struct se_cmd *cmd,
2371 int *ret)
2372{
2373 /*
2374 * Assume TYPE_DISK for non struct se_device objects.
2375 * Use 32-bit sector value.
2376 */
2377 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2378 (cdb[30] << 8) + cdb[31];
2379
2380}
2381
2382static inline u32 transport_get_size(
2383 u32 sectors,
2384 unsigned char *cdb,
2385 struct se_cmd *cmd)
2386{
5951146d 2387 struct se_device *dev = cmd->se_dev;
c66ac9db 2388
e3d6f909 2389 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2390 if (cdb[1] & 1) { /* sectors */
e3d6f909 2391 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2392 } else /* bytes */
2393 return sectors;
2394 }
2395#if 0
6708bb27 2396 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2397 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2398 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2399 dev->transport->name);
c66ac9db 2400#endif
e3d6f909 2401 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2402}
2403
c66ac9db
NB		 2404static void transport_xor_callback(struct se_cmd *cmd)
2405{
2406 unsigned char *buf, *addr;
ec98f782 2407 struct scatterlist *sg;
c66ac9db
NB		 2408 unsigned int offset;
2409 int i;
ec98f782 2410 int count;
c66ac9db
NB		 2411 /*
2412 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2413 *
2414 * 1) read the specified logical block(s);
2415 * 2) transfer logical blocks from the data-out buffer;
2416 * 3) XOR the logical blocks transferred from the data-out buffer with
2417 * the logical blocks read, storing the resulting XOR data in a buffer;
2418 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2419 * blocks transferred from the data-out buffer; and
2420 * 5) transfer the resulting XOR data to the data-in buffer.
2421 */
2422 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2423 if (!buf) {
2424 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2425 return;
2426 }
2427 /*
ec98f782 2428 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2429 * into the locally allocated *buf
2430 */
ec98f782
AG		 2431 sg_copy_to_buffer(cmd->t_data_sg,
2432 cmd->t_data_nents,
2433 buf,
2434 cmd->data_length);
2435
c66ac9db
NB		 2436 /*
2437 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2438 * cmd->t_mem_bidi_list
c66ac9db
NB		 2439 */
2440
2441 offset = 0;
ec98f782 2442 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
ca747d61 2443 addr = kmap_atomic(sg_page(sg));
ec98f782 2444 if (!addr)
c66ac9db
NB		 2445 goto out;
2446
ec98f782
AG		 2447 for (i = 0; i < sg->length; i++)
2448 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2449
ec98f782 2450 offset += sg->length;
ca747d61 2451 kunmap_atomic(addr);
c66ac9db 2452 }
ec98f782 2453
c66ac9db
NB		 2454out:
2455 kfree(buf);
2456}
2457
2458/*
2459 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2460 */
2461static int transport_get_sense_data(struct se_cmd *cmd)
2462{
2463 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2464 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2465 struct se_task *task = NULL, *task_tmp;
2466 unsigned long flags;
2467 u32 offset = 0;
2468
e3d6f909
AG		 2469 WARN_ON(!cmd->se_lun);
2470
42bf829e
CH		 2471 if (!dev)
2472 return 0;
2473
a1d8b49a 2474 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2475 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2476 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2477 return 0;
2478 }
2479
2480 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2481 &cmd->t_task_list, t_list) {
ef804a84 2482 if (!(task->task_flags & TF_HAS_SENSE))
c66ac9db
NB		 2483 continue;
2484
e3d6f909 2485 if (!dev->transport->get_sense_buffer) {
6708bb27 2486 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2487 " is NULL\n");
2488 continue;
2489 }
2490
e3d6f909 2491 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2492 if (!sense_buffer) {
04629b7b 2493 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2494 " sense buffer for task with sense\n",
04629b7b 2495 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2496 continue;
2497 }
a1d8b49a 2498 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2499
e3d6f909 2500 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2501 TRANSPORT_SENSE_BUFFER);
2502
5951146d 2503 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2504 TRANSPORT_SENSE_BUFFER);
2505 cmd->scsi_status = task->task_scsi_status;
2506 /* Automatically padded */
2507 cmd->scsi_sense_length =
2508 (TRANSPORT_SENSE_BUFFER + offset);
2509
6708bb27 2510 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2511 " and sense\n",
e3d6f909 2512 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2513 cmd->scsi_status);
2514 return 0;
2515 }
a1d8b49a 2516 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2517
2518 return -1;
2519}
2520
ec98f782
AG		 2521static inline long long transport_dev_end_lba(struct se_device *dev)
2522{
2523 return dev->transport->get_blocks(dev) + 1;
2524}
2525
2526static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2527{
2528 struct se_device *dev = cmd->se_dev;
2529 u32 sectors;
2530
2531 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2532 return 0;
2533
2534 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2535
6708bb27
AG		 2536 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2537 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2538 " transport_dev_end_lba(): %llu\n",
2539 cmd->t_task_lba, sectors,
2540 transport_dev_end_lba(dev));
7abbe7f3 2541 return -EINVAL;
ec98f782
AG		 2542 }
2543
7abbe7f3 2544 return 0;
ec98f782
AG		 2545}
2546
706d5860
NB		 2547static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2548{
2549 /*
2550 * Determine if the received WRITE_SAME is used to for direct
2551 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2552 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2553 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2554 */
2555 int passthrough = (dev->transport->transport_type ==
2556 TRANSPORT_PLUGIN_PHBA_PDEV);
2557
2558 if (!passthrough) {
2559 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2560 pr_err("WRITE_SAME PBDATA and LBDATA"
2561 " bits not supported for Block Discard"
2562 " Emulation\n");
2563 return -ENOSYS;
2564 }
2565 /*
2566 * Currently for the emulated case we only accept
2567 * tpws with the UNMAP=1 bit set.
2568 */
2569 if (!(flags[0] & 0x08)) {
2570 pr_err("WRITE_SAME w/o UNMAP bit not"
2571 " supported for Block Discard Emulation\n");
2572 return -ENOSYS;
2573 }
2574 }
2575
2576 return 0;
2577}
2578
c66ac9db
NB		 2579/* transport_generic_cmd_sequencer():
2580 *
2581 * Generic Command Sequencer that should work for most DAS transport
2582 * drivers.
2583 *
2584 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2585 * RX Thread.
2586 *
2587 * FIXME: Need to support other SCSI OPCODES where as well.
2588 */
2589static int transport_generic_cmd_sequencer(
2590 struct se_cmd *cmd,
2591 unsigned char *cdb)
2592{
5951146d 2593 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2594 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2595 int ret = 0, sector_ret = 0, passthrough;
2596 u32 sectors = 0, size = 0, pr_reg_type = 0;
2597 u16 service_action;
2598 u8 alua_ascq = 0;
2599 /*
2600 * Check for an existing UNIT ATTENTION condition
2601 */
2602 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2603 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2604 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2605 return -EINVAL;
c66ac9db
NB		 2606 }
2607 /*
2608 * Check status of Asymmetric Logical Unit Assignment port
2609 */
e3d6f909 2610 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2611 if (ret != 0) {
c66ac9db 2612 /*
25985edc 2613 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2614 * The ALUA additional sense code qualifier (ASCQ) is determined
2615 * by the ALUA primary or secondary access state..
2616 */
2617 if (ret > 0) {
2618#if 0
6708bb27 2619 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2620 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2621 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2622#endif
2623 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2624 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2625 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2626 return -EINVAL;
c66ac9db
NB		 2627 }
2628 goto out_invalid_cdb_field;
2629 }
2630 /*
2631 * Check status for SPC-3 Persistent Reservations
2632 */
e3d6f909
AG		 2633 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2634 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2635 cmd, cdb, pr_reg_type) != 0) {
2636 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2637 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
087a03b3 2638 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
03e98c9e
NB		 2639 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2640 return -EBUSY;
2641 }
c66ac9db
NB		 2642 /*
2643 * This means the CDB is allowed for the SCSI Initiator port
2644 * when said port is *NOT* holding the legacy SPC-2 or
2645 * SPC-3 Persistent Reservation.
2646 */
2647 }
2648
5bda90c8
CH		 2649 /*
2650 * If we operate in passthrough mode we skip most CDB emulation and
2651 * instead hand the commands down to the physical SCSI device.
2652 */
2653 passthrough =
2654 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2655
c66ac9db
NB		 2656 switch (cdb[0]) {
2657 case READ_6:
2658 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2659 if (sector_ret)
2660 goto out_unsupported_cdb;
2661 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2662 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2663 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2664 break;
2665 case READ_10:
2666 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2667 if (sector_ret)
2668 goto out_unsupported_cdb;
2669 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2670 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2671 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2672 break;
2673 case READ_12:
2674 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2675 if (sector_ret)
2676 goto out_unsupported_cdb;
2677 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2678 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2679 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2680 break;
2681 case READ_16:
2682 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2683 if (sector_ret)
2684 goto out_unsupported_cdb;
2685 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2686 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2687 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2688 break;
2689 case WRITE_6:
2690 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2691 if (sector_ret)
2692 goto out_unsupported_cdb;
2693 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2694 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2695 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2696 break;
2697 case WRITE_10:
2698 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2699 if (sector_ret)
2700 goto out_unsupported_cdb;
2701 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2702 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2703 if (cdb[1] & 0x8)
2704 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2705 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2706 break;
2707 case WRITE_12:
2708 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2709 if (sector_ret)
2710 goto out_unsupported_cdb;
2711 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2712 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2713 if (cdb[1] & 0x8)
2714 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2715 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2716 break;
2717 case WRITE_16:
2718 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2719 if (sector_ret)
2720 goto out_unsupported_cdb;
2721 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2722 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2723 if (cdb[1] & 0x8)
2724 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2725 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2726 break;
2727 case XDWRITEREAD_10:
2728 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2729 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2730 goto out_invalid_cdb_field;
2731 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2732 if (sector_ret)
2733 goto out_unsupported_cdb;
2734 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2735 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2736 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2737
5bda90c8
CH		 2738 /*
2739 * Do now allow BIDI commands for passthrough mode.
2740 */
2741 if (passthrough)
7c1c6af3 2742 goto out_unsupported_cdb;
5bda90c8 2743
c66ac9db 2744 /*
35e0e757 2745 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2746 */
2747 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2748 if (cdb[1] & 0x8)
2749 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2750 break;
2751 case VARIABLE_LENGTH_CMD:
2752 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2753 switch (service_action) {
2754 case XDWRITEREAD_32:
2755 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2756 if (sector_ret)
2757 goto out_unsupported_cdb;
2758 size = transport_get_size(sectors, cdb, cmd);
2759 /*
2760 * Use WRITE_32 and READ_32 opcodes for the emulated
2761 * XDWRITE_READ_32 logic.
2762 */
a1d8b49a 2763 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2764 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2765
5bda90c8
CH		 2766 /*
2767 * Do now allow BIDI commands for passthrough mode.
2768 */
c66ac9db 2769 if (passthrough)
7c1c6af3 2770 goto out_unsupported_cdb;
5bda90c8 2771
c66ac9db 2772 /*
35e0e757
CH		 2773 * Setup BIDI XOR callback to be run during after I/O
2774 * completion.
c66ac9db
NB		 2775 */
2776 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2777 if (cdb[1] & 0x8)
2778 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2779 break;
2780 case WRITE_SAME_32:
2781 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2782 if (sector_ret)
2783 goto out_unsupported_cdb;
dd3a5ad8 2784
6708bb27 2785 if (sectors)
12850626 2786 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2787 else {
2788 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2789 " supported\n");
2790 goto out_invalid_cdb_field;
2791 }
dd3a5ad8 2792
a1d8b49a 2793 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2794 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2795
706d5860 2796 if (target_check_write_same_discard(&cdb[10], dev) < 0)
67236c44 2797 goto out_unsupported_cdb;
5bda90c8
CH		 2798 if (!passthrough)
2799 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2800 break;
2801 default:
6708bb27 2802 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2803 " 0x%04x not supported\n", service_action);
2804 goto out_unsupported_cdb;
2805 }
2806 break;
e434f1f1 2807 case MAINTENANCE_IN:
e3d6f909 2808 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2809 /* MAINTENANCE_IN from SCC-2 */
2810 /*
2811 * Check for emulated MI_REPORT_TARGET_PGS.
2812 */
e76a35d6
CH		 2813 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2814 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2815 cmd->execute_task =
2816 target_emulate_report_target_port_groups;
c66ac9db
NB		 2817 }
2818 size = (cdb[6] << 24) | (cdb[7] << 16) |
2819 (cdb[8] << 8) | cdb[9];
2820 } else {
2821 /* GPCMD_SEND_KEY from multi media commands */
2822 size = (cdb[8] << 8) + cdb[9];
2823 }
05d1c7c0 2824 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2825 break;
2826 case MODE_SELECT:
2827 size = cdb[4];
2828 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2829 break;
2830 case MODE_SELECT_10:
2831 size = (cdb[7] << 8) + cdb[8];
2832 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2833 break;
2834 case MODE_SENSE:
2835 size = cdb[4];
05d1c7c0 2836 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2837 if (!passthrough)
2838 cmd->execute_task = target_emulate_modesense;
c66ac9db
NB		 2839 break;
2840 case MODE_SENSE_10:
5bda90c8
CH		 2841 size = (cdb[7] << 8) + cdb[8];
2842 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2843 if (!passthrough)
2844 cmd->execute_task = target_emulate_modesense;
2845 break;
c66ac9db
NB		 2846 case GPCMD_READ_BUFFER_CAPACITY:
2847 case GPCMD_SEND_OPC:
2848 case LOG_SELECT:
2849 case LOG_SENSE:
2850 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2851 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2852 break;
2853 case READ_BLOCK_LIMITS:
2854 size = READ_BLOCK_LEN;
05d1c7c0 2855 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2856 break;
2857 case GPCMD_GET_CONFIGURATION:
2858 case GPCMD_READ_FORMAT_CAPACITIES:
2859 case GPCMD_READ_DISC_INFO:
2860 case GPCMD_READ_TRACK_RZONE_INFO:
2861 size = (cdb[7] << 8) + cdb[8];
2862 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2863 break;
2864 case PERSISTENT_RESERVE_IN:
617c0e06 2865 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2866 cmd->execute_task = target_scsi3_emulate_pr_in;
617c0e06
CH		 2867 size = (cdb[7] << 8) + cdb[8];
2868 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2869 break;
c66ac9db 2870 case PERSISTENT_RESERVE_OUT:
617c0e06 2871 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2872 cmd->execute_task = target_scsi3_emulate_pr_out;
c66ac9db 2873 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2874 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2875 break;
2876 case GPCMD_MECHANISM_STATUS:
2877 case GPCMD_READ_DVD_STRUCTURE:
2878 size = (cdb[8] << 8) + cdb[9];
2879 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2880 break;
2881 case READ_POSITION:
2882 size = READ_POSITION_LEN;
05d1c7c0 2883 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2884 break;
e434f1f1 2885 case MAINTENANCE_OUT:
e3d6f909 2886 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2887 /* MAINTENANCE_OUT from SCC-2
2888 *
2889 * Check for emulated MO_SET_TARGET_PGS.
2890 */
e76a35d6
CH		 2891 if (cdb[1] == MO_SET_TARGET_PGS &&
2892 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2893 cmd->execute_task =
2894 target_emulate_set_target_port_groups;
c66ac9db
NB		 2895 }
2896
2897 size = (cdb[6] << 24) | (cdb[7] << 16) |
2898 (cdb[8] << 8) | cdb[9];
2899 } else {
2900 /* GPCMD_REPORT_KEY from multi media commands */
2901 size = (cdb[8] << 8) + cdb[9];
2902 }
05d1c7c0 2903 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2904 break;
2905 case INQUIRY:
2906 size = (cdb[3] << 8) + cdb[4];
2907 /*
2908 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2909 * See spc4r17 section 5.3
2910 */
5951146d 2911 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2912 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2913 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2914 if (!passthrough)
2915 cmd->execute_task = target_emulate_inquiry;
c66ac9db
NB		 2916 break;
2917 case READ_BUFFER:
2918 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2919 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2920 break;
2921 case READ_CAPACITY:
2922 size = READ_CAP_LEN;
05d1c7c0 2923 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2924 if (!passthrough)
2925 cmd->execute_task = target_emulate_readcapacity;
c66ac9db
NB		 2926 break;
2927 case READ_MEDIA_SERIAL_NUMBER:
2928 case SECURITY_PROTOCOL_IN:
2929 case SECURITY_PROTOCOL_OUT:
2930 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2931 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2932 break;
2933 case SERVICE_ACTION_IN:
5bda90c8
CH		 2934 switch (cmd->t_task_cdb[1] & 0x1f) {
2935 case SAI_READ_CAPACITY_16:
2936 if (!passthrough)
2937 cmd->execute_task =
2938 target_emulate_readcapacity_16;
2939 break;
2940 default:
2941 if (passthrough)
2942 break;
2943
2944 pr_err("Unsupported SA: 0x%02x\n",
2945 cmd->t_task_cdb[1] & 0x1f);
b168fe8c 2946 goto out_invalid_cdb_field;
5bda90c8
CH		 2947 }
2948 /*FALLTHROUGH*/
c66ac9db
NB		 2949 case ACCESS_CONTROL_IN:
2950 case ACCESS_CONTROL_OUT:
2951 case EXTENDED_COPY:
2952 case READ_ATTRIBUTE:
2953 case RECEIVE_COPY_RESULTS:
2954 case WRITE_ATTRIBUTE:
2955 size = (cdb[10] << 24) | (cdb[11] << 16) |
2956 (cdb[12] << 8) | cdb[13];
05d1c7c0 2957 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2958 break;
2959 case RECEIVE_DIAGNOSTIC:
2960 case SEND_DIAGNOSTIC:
2961 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2962 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2963 break;
2964/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2965#if 0
2966 case GPCMD_READ_CD:
2967 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2968 size = (2336 * sectors);
05d1c7c0 2969 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2970 break;
2971#endif
2972 case READ_TOC:
2973 size = cdb[8];
05d1c7c0 2974 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2975 break;
2976 case REQUEST_SENSE:
2977 size = cdb[4];
05d1c7c0 2978 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2979 if (!passthrough)
2980 cmd->execute_task = target_emulate_request_sense;
c66ac9db
NB		 2981 break;
2982 case READ_ELEMENT_STATUS:
2983 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2984 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2985 break;
2986 case WRITE_BUFFER:
2987 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2988 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2989 break;
2990 case RESERVE:
2991 case RESERVE_10:
2992 /*
2993 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2994 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2995 */
2996 if (cdb[0] == RESERVE_10)
2997 size = (cdb[7] << 8) | cdb[8];
2998 else
2999 size = cmd->data_length;
3000
3001 /*
3002 * Setup the legacy emulated handler for SPC-2 and
3003 * >= SPC-3 compatible reservation handling (CRH=1)
3004 * Otherwise, we assume the underlying SCSI logic is
3005 * is running in SPC_PASSTHROUGH, and wants reservations
3006 * emulation disabled.
3007 */
e76a35d6
CH		 3008 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
3009 cmd->execute_task = target_scsi2_reservation_reserve;
c66ac9db
NB		 3010 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3011 break;
3012 case RELEASE:
3013 case RELEASE_10:
3014 /*
3015 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3016 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3017 */
3018 if (cdb[0] == RELEASE_10)
3019 size = (cdb[7] << 8) | cdb[8];
3020 else
3021 size = cmd->data_length;
3022
e76a35d6
CH		 3023 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
3024 cmd->execute_task = target_scsi2_reservation_release;
c66ac9db
NB		 3025 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3026 break;
3027 case SYNCHRONIZE_CACHE:
8e94b8db 3028 case SYNCHRONIZE_CACHE_16:
c66ac9db
NB		 3029 /*
3030 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3031 */
3032 if (cdb[0] == SYNCHRONIZE_CACHE) {
3033 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3034 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3035 } else {
3036 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3037 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3038 }
3039 if (sector_ret)
3040 goto out_unsupported_cdb;
3041
3042 size = transport_get_size(sectors, cdb, cmd);
3043 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3044
5bda90c8 3045 if (passthrough)
c66ac9db 3046 break;
5bda90c8 3047
c66ac9db
NB		 3048 /*
3049 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3050 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3051 */
7abbe7f3
NB		 3052 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3053 if (transport_cmd_get_valid_sectors(cmd) < 0)
3054 goto out_invalid_cdb_field;
3055 }
5bda90c8 3056 cmd->execute_task = target_emulate_synchronize_cache;
c66ac9db
NB		 3057 break;
3058 case UNMAP:
3059 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3060 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 3061 if (!passthrough)
3062 cmd->execute_task = target_emulate_unmap;
c66ac9db
NB		 3063 break;
3064 case WRITE_SAME_16:
3065 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3066 if (sector_ret)
3067 goto out_unsupported_cdb;
dd3a5ad8 3068
6708bb27 3069 if (sectors)
12850626 3070 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3071 else {
3072 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3073 goto out_invalid_cdb_field;
3074 }
dd3a5ad8 3075
5db0753b 3076 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3077 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3078
3079 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 3080 goto out_unsupported_cdb;
5bda90c8
CH		 3081 if (!passthrough)
3082 cmd->execute_task = target_emulate_write_same;
706d5860
NB		 3083 break;
3084 case WRITE_SAME:
3085 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3086 if (sector_ret)
3087 goto out_unsupported_cdb;
3088
3089 if (sectors)
12850626 3090 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3091 else {
3092 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3093 goto out_invalid_cdb_field;
c66ac9db 3094 }
706d5860
NB		 3095
3096 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3097 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3098 /*
3099 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3100 * of byte 1 bit 3 UNMAP instead of original reserved field
3101 */
3102 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 3103 goto out_unsupported_cdb;
5bda90c8
CH		 3104 if (!passthrough)
3105 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 3106 break;
3107 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 3108 case ERASE:
c66ac9db
NB		 3109 case REZERO_UNIT:
3110 case SEEK_10:
c66ac9db
NB		 3111 case SPACE:
3112 case START_STOP:
3113 case TEST_UNIT_READY:
3114 case VERIFY:
3115 case WRITE_FILEMARKS:
5bda90c8
CH		 3116 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3117 if (!passthrough)
3118 cmd->execute_task = target_emulate_noop;
3119 break;
3120 case GPCMD_CLOSE_TRACK:
3121 case INITIALIZE_ELEMENT_STATUS:
3122 case GPCMD_LOAD_UNLOAD:
3123 case GPCMD_SET_SPEED:
c66ac9db
NB		 3124 case MOVE_MEDIUM:
3125 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3126 break;
3127 case REPORT_LUNS:
e76a35d6 3128 cmd->execute_task = target_report_luns;
c66ac9db
NB		 3129 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3130 /*
3131 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3132 * See spc4r17 section 5.3
3133 */
5951146d 3134 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3135 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3136 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3137 break;
3138 default:
6708bb27 3139 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3140 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3141 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3142 goto out_unsupported_cdb;
3143 }
3144
3145 if (size != cmd->data_length) {
6708bb27 3146 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3147 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3148 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3149 cmd->data_length, size, cdb[0]);
3150
3151 cmd->cmd_spdtl = size;
3152
3153 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3154 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3155 " WRITE data\n");
3156 goto out_invalid_cdb_field;
3157 }
3158 /*
3159 * Reject READ_* or WRITE_* with overflow/underflow for
3160 * type SCF_SCSI_DATA_SG_IO_CDB.
3161 */
6708bb27
AG		 3162 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3163 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3164 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3165 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3166 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3167 goto out_invalid_cdb_field;
3168 }
3169
3170 if (size > cmd->data_length) {
3171 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3172 cmd->residual_count = (size - cmd->data_length);
3173 } else {
3174 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3175 cmd->residual_count = (cmd->data_length - size);
3176 }
3177 cmd->data_length = size;
3178 }
3179
015487b8
RD		 3180 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB &&
3181 sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) {
3182 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too big sectors %u\n",
3183 cdb[0], sectors);
3184 goto out_invalid_cdb_field;
3185 }
3186
5bda90c8
CH		 3187 /* reject any command that we don't have a handler for */
3188 if (!(passthrough || cmd->execute_task ||
3189 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3190 goto out_unsupported_cdb;
3191
c66ac9db
NB		 3192 transport_set_supported_SAM_opcode(cmd);
3193 return ret;
3194
3195out_unsupported_cdb:
3196 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3197 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3198 return -EINVAL;
c66ac9db
NB		 3199out_invalid_cdb_field:
3200 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3201 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3202 return -EINVAL;
c66ac9db
NB		 3203}
3204
c66ac9db 3205/*
35e0e757 3206 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3207 * and ordered cmds need to have their tasks added to the execution queue.
3208 */
3209static void transport_complete_task_attr(struct se_cmd *cmd)
3210{
5951146d 3211 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3212 struct se_cmd *cmd_p, *cmd_tmp;
3213 int new_active_tasks = 0;
3214
e66ecd50 3215 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3216 atomic_dec(&dev->simple_cmds);
3217 smp_mb__after_atomic_dec();
3218 dev->dev_cur_ordered_id++;
6708bb27 3219 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3220 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3221 cmd->se_ordered_id);
e66ecd50 3222 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3223 dev->dev_cur_ordered_id++;
6708bb27 3224 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3225 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3226 cmd->se_ordered_id);
e66ecd50 3227 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3228 atomic_dec(&dev->dev_ordered_sync);
3229 smp_mb__after_atomic_dec();
c66ac9db
NB		 3230
3231 dev->dev_cur_ordered_id++;
6708bb27 3232 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3233 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3234 }
3235 /*
3236 * Process all commands up to the last received
3237 * ORDERED task attribute which requires another blocking
3238 * boundary
3239 */
3240 spin_lock(&dev->delayed_cmd_lock);
3241 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3242 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3243
5951146d 3244 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3245 spin_unlock(&dev->delayed_cmd_lock);
3246
6708bb27 3247 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3248 " cmd_p: 0x%02x Task Attr: 0x%02x"
3249 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3250 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3251 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3252
3253 transport_add_tasks_from_cmd(cmd_p);
3254 new_active_tasks++;
3255
3256 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3257 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3258 break;
3259 }
3260 spin_unlock(&dev->delayed_cmd_lock);
3261 /*
3262 * If new tasks have become active, wake up the transport thread
3263 * to do the processing of the Active tasks.
3264 */
3265 if (new_active_tasks != 0)
e3d6f909 3266 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3267}
3268
e057f533 3269static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3270{
3271 int ret = 0;
3272
e057f533
CH		 3273 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3274 transport_complete_task_attr(cmd);
3275
3276 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3277 ret = cmd->se_tfo->queue_status(cmd);
3278 if (ret)
3279 goto out;
3280 }
07bde79a
NB		 3281
3282 switch (cmd->data_direction) {
3283 case DMA_FROM_DEVICE:
3284 ret = cmd->se_tfo->queue_data_in(cmd);
3285 break;
3286 case DMA_TO_DEVICE:
ec98f782 3287 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3288 ret = cmd->se_tfo->queue_data_in(cmd);
3289 if (ret < 0)
e057f533 3290 break;
07bde79a
NB		 3291 }
3292 /* Fall through for DMA_TO_DEVICE */
3293 case DMA_NONE:
3294 ret = cmd->se_tfo->queue_status(cmd);
3295 break;
3296 default:
3297 break;
3298 }
3299
e057f533
CH		 3300out:
3301 if (ret < 0) {
3302 transport_handle_queue_full(cmd, cmd->se_dev);
3303 return;
3304 }
3305 transport_lun_remove_cmd(cmd);
3306 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3307}
3308
3309static void transport_handle_queue_full(
3310 struct se_cmd *cmd,
e057f533 3311 struct se_device *dev)
07bde79a
NB		 3312{
3313 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3314 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3315 atomic_inc(&dev->dev_qf_count);
3316 smp_mb__after_atomic_inc();
3317 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3318
3319 schedule_work(&cmd->se_dev->qf_work_queue);
3320}
3321
35e0e757 3322static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3323{
35e0e757 3324 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3325 int reason = 0, ret;
35e0e757 3326
c66ac9db
NB		 3327 /*
3328 * Check if we need to move delayed/dormant tasks from cmds on the
3329 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3330 * Attribute.
3331 */
5951146d 3332 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3333 transport_complete_task_attr(cmd);
07bde79a
NB		 3334 /*
3335 * Check to schedule QUEUE_FULL work, or execute an existing
3336 * cmd->transport_qf_callback()
3337 */
3338 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3339 schedule_work(&cmd->se_dev->qf_work_queue);
3340
c66ac9db
NB		 3341 /*
3342 * Check if we need to retrieve a sense buffer from
3343 * the struct se_cmd in question.
3344 */
3345 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3346 if (transport_get_sense_data(cmd) < 0)
3347 reason = TCM_NON_EXISTENT_LUN;
3348
3349 /*
3350 * Only set when an struct se_task->task_scsi_status returned
3351 * a non GOOD status.
3352 */
3353 if (cmd->scsi_status) {
07bde79a 3354 ret = transport_send_check_condition_and_sense(
c66ac9db 3355 cmd, reason, 1);
f147abb4 3356 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3357 goto queue_full;
3358
c66ac9db
NB		 3359 transport_lun_remove_cmd(cmd);
3360 transport_cmd_check_stop_to_fabric(cmd);
3361 return;
3362 }
3363 }
3364 /*
25985edc 3365 * Check for a callback, used by amongst other things
c66ac9db
NB		 3366 * XDWRITE_READ_10 emulation.
3367 */
3368 if (cmd->transport_complete_callback)
3369 cmd->transport_complete_callback(cmd);
3370
3371 switch (cmd->data_direction) {
3372 case DMA_FROM_DEVICE:
3373 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3374 if (cmd->se_lun->lun_sep) {
3375 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3376 cmd->data_length;
3377 }
3378 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3379
07bde79a 3380 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3381 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3382 goto queue_full;
c66ac9db
NB		 3383 break;
3384 case DMA_TO_DEVICE:
3385 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3386 if (cmd->se_lun->lun_sep) {
3387 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3388 cmd->data_length;
3389 }
3390 spin_unlock(&cmd->se_lun->lun_sep_lock);
3391 /*
3392 * Check if we need to send READ payload for BIDI-COMMAND
3393 */
ec98f782 3394 if (cmd->t_bidi_data_sg) {
c66ac9db 3395 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3396 if (cmd->se_lun->lun_sep) {
3397 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3398 cmd->data_length;
3399 }
3400 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3401 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3402 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3403 goto queue_full;
c66ac9db
NB		 3404 break;
3405 }
3406 /* Fall through for DMA_TO_DEVICE */
3407 case DMA_NONE:
07bde79a 3408 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3409 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3410 goto queue_full;
c66ac9db
NB		 3411 break;
3412 default:
3413 break;
3414 }
3415
3416 transport_lun_remove_cmd(cmd);
3417 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3418 return;
3419
3420queue_full:
6708bb27 3421 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3422 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3423 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3424 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3425}
3426
3427static void transport_free_dev_tasks(struct se_cmd *cmd)
3428{
3429 struct se_task *task, *task_tmp;
3430 unsigned long flags;
0c2cfe5f 3431 LIST_HEAD(dispose_list);
c66ac9db 3432
a1d8b49a 3433 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3434 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3435 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3436 if (!(task->task_flags & TF_ACTIVE))
3437 list_move_tail(&task->t_list, &dispose_list);
3438 }
3439 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3440
3441 while (!list_empty(&dispose_list)) {
3442 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3443
af3f00c7
CH		 3444 if (task->task_sg != cmd->t_data_sg &&
3445 task->task_sg != cmd->t_bidi_data_sg)
3446 kfree(task->task_sg);
c66ac9db
NB		 3447
3448 list_del(&task->t_list);
3449
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
c66ac9db
NB		 3701
3702/*
3703 * This function can be used by HW target mode drivers to create a linked
3704 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3705 * This is intended to be called during the completion path by TCM Core
3706 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3707 */
3708void transport_do_task_sg_chain(struct se_cmd *cmd)
3709{
ec98f782
AG		 3710 struct scatterlist *sg_first = NULL;
3711 struct scatterlist *sg_prev = NULL;
3712 int sg_prev_nents = 0;
3713 struct scatterlist *sg;
c66ac9db 3714 struct se_task *task;
ec98f782 3715 u32 chained_nents = 0;
c66ac9db
NB		 3716 int i;
3717
ec98f782
AG		 3718 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3719
c66ac9db
NB		 3720 /*
3721 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3722 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3723 */
a1d8b49a 3724 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3725 if (!task->task_sg)
c66ac9db
NB		 3726 continue;
3727
ec98f782
AG		 3728 if (!sg_first) {
3729 sg_first = task->task_sg;
6708bb27 3730 chained_nents = task->task_sg_nents;
97868c89 3731 } else {
ec98f782 3732 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3733 chained_nents += task->task_sg_nents;
97868c89 3734 }
c3c74c7a
NB		 3735 /*
3736 * For the padded tasks, use the extra SGL vector allocated
3737 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3738 * offset into sg_chain() above.
3739 *
3740 * We do not need the padding for the last task (or a single
3741 * task), but in that case we will never use the sg_prev_nents
3742 * value below which would be incorrect.
c3c74c7a 3743 */
04629b7b 3744 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3745 sg_prev = task->task_sg;
c66ac9db
NB		 3746 }
3747 /*
3748 * Setup the starting pointer and total t_tasks_sg_linked_no including
3749 * padding SGs for linking and to mark the end.
3750 */
a1d8b49a 3751 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3752 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3753
6708bb27 3754 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3755 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3756 cmd->t_tasks_sg_chained_no);
c66ac9db 3757
a1d8b49a
AG		 3758 for_each_sg(cmd->t_tasks_sg_chained, sg,
3759 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3760
6708bb27 3761 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3762 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3763 if (sg_is_chain(sg))
6708bb27 3764 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3765 if (sg_is_last(sg))
6708bb27 3766 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3767 }
c66ac9db
NB		 3768}
3769EXPORT_SYMBOL(transport_do_task_sg_chain);
3770
a1d8b49a
AG		 3771/*
3772 * Break up cmd into chunks transport can handle
3773 */
38b40067
CH		 3774static int
3775transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3776 enum dma_data_direction data_direction,
38b40067 3777 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3778{
5951146d 3779 struct se_device *dev = cmd->se_dev;
a3eedc22 3780 int task_count, i;
38b40067
CH		 3781 unsigned long long lba;
3782 sector_t sectors, dev_max_sectors;
3783 u32 sector_size;
3784
3785 if (transport_cmd_get_valid_sectors(cmd) < 0)
3786 return -EINVAL;
3787
3788 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3789 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
a1d8b49a 3790
ec98f782 3791 WARN_ON(cmd->data_length % sector_size);
38b40067
CH		 3792
3793 lba = cmd->t_task_lba;
ec98f782 3794 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27 3795 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
af3f00c7
CH		 3796
3797 /*
3798 * If we need just a single task reuse the SG list in the command
3799 * and avoid a lot of work.
3800 */
3801 if (task_count == 1) {
3802 struct se_task *task;
3803 unsigned long flags;
3804
3805 task = transport_generic_get_task(cmd, data_direction);
3806 if (!task)
3807 return -ENOMEM;
3808
3809 task->task_sg = cmd_sg;
3810 task->task_sg_nents = sgl_nents;
3811
3812 task->task_lba = lba;
3813 task->task_sectors = sectors;
3814 task->task_size = task->task_sectors * sector_size;
3815
3816 spin_lock_irqsave(&cmd->t_state_lock, flags);
3817 list_add_tail(&task->t_list, &cmd->t_task_list);
3818 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3819
3820 return task_count;
3821 }
3822
ec98f782 3823 for (i = 0; i < task_count; i++) {
38b40067 3824 struct se_task *task;
c3c74c7a 3825 unsigned int task_size, task_sg_nents_padded;
38b40067
CH		 3826 struct scatterlist *sg;
3827 unsigned long flags;
ec98f782 3828 int count;
a1d8b49a 3829
c66ac9db 3830 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3831 if (!task)
ec98f782 3832 return -ENOMEM;
c66ac9db 3833
c66ac9db 3834 task->task_lba = lba;
ec98f782
AG		 3835 task->task_sectors = min(sectors, dev_max_sectors);
3836 task->task_size = task->task_sectors * sector_size;
c66ac9db 3837
525a48a2
NB		 3838 /*
3839 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3840 * in order to calculate the number per task SGL entries
3841 */
3842 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3843 /*
ec98f782
AG		 3844 * Check if the fabric module driver is requesting that all
3845 * struct se_task->task_sg[] be chained together.. If so,
3846 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3847 * marking the end of the chained SGL for every task except
3848 * the last one for (task_count > 1) operation, or skipping
3849 * the extra padding for the (task_count == 1) case.
c66ac9db 3850 */
c3c74c7a
NB		 3851 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3852 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3853 } else
3854 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3855
1d20bb61 3856 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3857 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3858 if (!task->task_sg) {
3859 cmd->se_dev->transport->free_task(task);
3860 return -ENOMEM;
3861 }
3862
c3c74c7a 3863 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3864
ec98f782
AG		 3865 task_size = task->task_size;
3866
3867 /* Build new sgl, only up to task_size */
6708bb27 3868 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3869 if (cmd_sg->length > task_size)
3870 break;
3871
3872 *sg = *cmd_sg;
3873 task_size -= cmd_sg->length;
3874 cmd_sg = sg_next(cmd_sg);
c66ac9db 3875 }
c66ac9db 3876
ec98f782
AG		 3877 lba += task->task_sectors;
3878 sectors -= task->task_sectors;
c66ac9db 3879
ec98f782
AG		 3880 spin_lock_irqsave(&cmd->t_state_lock, flags);
3881 list_add_tail(&task->t_list, &cmd->t_task_list);
3882 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3883 }
3884
ec98f782 3885 return task_count;
c66ac9db
NB		 3886}
3887
3888static int
ec98f782 3889transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3890{
c66ac9db 3891 struct se_task *task;
ec98f782 3892 unsigned long flags;
c66ac9db 3893
91ec1d35
NB		 3894 /* Workaround for handling zero-length control CDBs */
3895 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3896 !cmd->data_length)
3897 return 0;
3898
c66ac9db
NB		 3899 task = transport_generic_get_task(cmd, cmd->data_direction);
3900 if (!task)
ec98f782 3901 return -ENOMEM;
c66ac9db 3902
af3f00c7 3903 task->task_sg = cmd->t_data_sg;
c66ac9db 3904 task->task_size = cmd->data_length;
6708bb27 3905 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3906
ec98f782
AG		 3907 spin_lock_irqsave(&cmd->t_state_lock, flags);
3908 list_add_tail(&task->t_list, &cmd->t_task_list);
3909 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3910
6708bb27 3911 /* Success! Return number of tasks allocated */
a3eedc22 3912 return 1;
ec98f782
AG		 3913}
3914
da0f7619
CH		 3915/*
3916 * Allocate any required ressources to execute the command, and either place
3917 * it on the execution queue if possible. For writes we might not have the
3918 * payload yet, thus notify the fabric via a call to ->write_pending instead.
c66ac9db 3919 */
a1d8b49a 3920int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3921{
da0f7619 3922 struct se_device *dev = cmd->se_dev;
9ac54987 3923 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3924 int set_counts = 1;
c66ac9db
NB		 3925 int ret = 0;
3926
3927 /*
3928 * Determine is the TCM fabric module has already allocated physical
3929 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3930 * beforehand.
c66ac9db 3931 */
ec98f782
AG		 3932 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3933 cmd->data_length) {
05d1c7c0 3934 ret = transport_generic_get_mem(cmd);
c66ac9db 3935 if (ret < 0)
03e98c9e 3936 goto out_fail;
c66ac9db 3937 }
da0f7619 3938
1d20bb61 3939 /*
38b40067 3940 * For BIDI command set up the read tasks first.
1d20bb61 3941 */
da0f7619 3942 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3943 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3944 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3945
9ac54987
NB		 3946 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3947 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3948 cmd->t_bidi_data_nents);
3949 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3950 goto out_fail;
3951
3952 atomic_inc(&cmd->t_fe_count);
3953 atomic_inc(&cmd->t_se_count);
3954 set_counts = 0;
3955 }
38b40067
CH		 3956
3957 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3958 task_cdbs = transport_allocate_data_tasks(cmd,
3959 cmd->data_direction, cmd->t_data_sg,
3960 cmd->t_data_nents);
3961 } else {
3962 task_cdbs = transport_allocate_control_task(cmd);
3963 }
3964
410f6702 3965 if (task_cdbs < 0)
da0f7619 3966 goto out_fail;
410f6702 3967 else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
7d680f3b 3968 spin_lock_irq(&cmd->t_state_lock);
410f6702 3969 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 3970 cmd->transport_state |= CMD_T_ACTIVE;
3971 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 3972
3973 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3974 u8 ua_asc = 0, ua_ascq = 0;
3975
3976 core_scsi3_ua_clear_for_request_sense(cmd,
3977 &ua_asc, &ua_ascq);
3978 }
3979
410f6702
RD		 3980 INIT_WORK(&cmd->work, target_complete_ok_work);
3981 queue_work(target_completion_wq, &cmd->work);
3982 return 0;
3983 }
da0f7619
CH		 3984
3985 if (set_counts) {
3986 atomic_inc(&cmd->t_fe_count);
3987 atomic_inc(&cmd->t_se_count);
3988 }
3989
9ac54987
NB		 3990 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3991 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3992 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3993
c66ac9db 3994 /*
a1d8b49a 3995 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3996 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3997 * will be added to the struct se_device execution queue after its WRITE
3998 * data has arrived. (ie: It gets handled by the transport processing
3999 * thread a second time)
4000 */
4001 if (cmd->data_direction == DMA_TO_DEVICE) {
4002 transport_add_tasks_to_state_queue(cmd);
4003 return transport_generic_write_pending(cmd);
4004 }
4005 /*
4006 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4007 * to the execution queue.
4008 */
4009 transport_execute_tasks(cmd);
4010 return 0;
da0f7619
CH		 4011
4012out_fail:
4013 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4014 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4015 return -EINVAL;
c66ac9db 4016}
a1d8b49a 4017EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4018
4019/* transport_generic_process_write():
4020 *
4021 *
4022 */
4023void transport_generic_process_write(struct se_cmd *cmd)
4024{
c66ac9db
NB		 4025 transport_execute_tasks(cmd);
4026}
4027EXPORT_SYMBOL(transport_generic_process_write);
4028
e057f533 4029static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 4030{
f147abb4
NB		 4031 int ret;
4032
4033 ret = cmd->se_tfo->write_pending(cmd);
4034 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 4035 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4036 cmd);
4037 transport_handle_queue_full(cmd, cmd->se_dev);
4038 }
07bde79a
NB		 4039}
4040
c66ac9db
NB		 4041static int transport_generic_write_pending(struct se_cmd *cmd)
4042{
4043 unsigned long flags;
4044 int ret;
4045
a1d8b49a 4046 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4047 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4048 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 4049
c66ac9db
NB		 4050 /*
4051 * Clear the se_cmd for WRITE_PENDING status in order to set
7d680f3b
CH		 4052 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
4053 * from HW target mode interrupt code. This is safe to be called
4054 * with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4055 * because the se_cmd->se_lun pointer is not being cleared.
4056 */
4057 transport_cmd_check_stop(cmd, 1, 0);
4058
4059 /*
4060 * Call the fabric write_pending function here to let the
4061 * frontend know that WRITE buffers are ready.
4062 */
e3d6f909 4063 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 4064 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 4065 goto queue_full;
4066 else if (ret < 0)
c66ac9db
NB		 4067 return ret;
4068
03e98c9e 4069 return 1;
07bde79a
NB		 4070
4071queue_full:
6708bb27 4072 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 4073 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 4074 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 4075 return 0;
c66ac9db
NB		 4076}
4077
39c05f32 4078void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 4079{
d14921d6 4080 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 4081 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 4082 transport_wait_for_tasks(cmd);
4083
35462975 4084 transport_release_cmd(cmd);
d14921d6
NB		 4085 } else {
4086 if (wait_for_tasks)
4087 transport_wait_for_tasks(cmd);
4088
c66ac9db
NB		 4089 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4090
82f1c8a4 4091 if (cmd->se_lun)
c66ac9db 4092 transport_lun_remove_cmd(cmd);
c66ac9db 4093
f4366772
NB		 4094 transport_free_dev_tasks(cmd);
4095
39c05f32 4096 transport_put_cmd(cmd);
c66ac9db
NB		 4097 }
4098}
4099EXPORT_SYMBOL(transport_generic_free_cmd);
4100
a17f091d
NB		 4101/* target_get_sess_cmd - Add command to active ->sess_cmd_list
4102 * @se_sess: session to reference
4103 * @se_cmd: command descriptor to add
a6360785 4104 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 4105 */
a6360785
NB		 4106void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
4107 bool ack_kref)
a17f091d
NB		 4108{
4109 unsigned long flags;
4110
7481deb4 4111 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 4112 /*
4113 * Add a second kref if the fabric caller is expecting to handle
4114 * fabric acknowledgement that requires two target_put_sess_cmd()
4115 * invocations before se_cmd descriptor release.
4116 */
86715569 4117 if (ack_kref == true) {
a6360785 4118 kref_get(&se_cmd->cmd_kref);
86715569
NB		 4119 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
4120 }
7481deb4 4121
a17f091d
NB		 4122 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4123 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
4124 se_cmd->check_release = 1;
4125 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4126}
4127EXPORT_SYMBOL(target_get_sess_cmd);
4128
7481deb4 4129static void target_release_cmd_kref(struct kref *kref)
a17f091d 4130{
7481deb4
NB		 4131 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
4132 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 4133 unsigned long flags;
4134
4135 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4136 if (list_empty(&se_cmd->se_cmd_list)) {
4137 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 4138 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 4139 return;
a17f091d 4140 }
a17f091d
NB		 4141 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
4142 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4143 complete(&se_cmd->cmd_wait_comp);
7481deb4 4144 return;
a17f091d
NB		 4145 }
4146 list_del(&se_cmd->se_cmd_list);
4147 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4148
7481deb4
NB		 4149 se_cmd->se_tfo->release_cmd(se_cmd);
4150}
4151
4152/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4153 * @se_sess: session to reference
4154 * @se_cmd: command descriptor to drop
4155 */
4156int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4157{
4158 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 4159}
4160EXPORT_SYMBOL(target_put_sess_cmd);
4161
4162/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4163 * @se_sess: session to split
4164 */
4165void target_splice_sess_cmd_list(struct se_session *se_sess)
4166{
4167 struct se_cmd *se_cmd;
4168 unsigned long flags;
4169
4170 WARN_ON(!list_empty(&se_sess->sess_wait_list));
4171 INIT_LIST_HEAD(&se_sess->sess_wait_list);
4172
4173 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4174 se_sess->sess_tearing_down = 1;
4175
4176 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4177
4178 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4179 se_cmd->cmd_wait_set = 1;
4180
4181 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4182}
4183EXPORT_SYMBOL(target_splice_sess_cmd_list);
4184
4185/* target_wait_for_sess_cmds - Wait for outstanding descriptors
4186 * @se_sess: session to wait for active I/O
4187 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4188 */
4189void target_wait_for_sess_cmds(
4190 struct se_session *se_sess,
4191 int wait_for_tasks)
4192{
4193 struct se_cmd *se_cmd, *tmp_cmd;
4194 bool rc = false;
4195
4196 list_for_each_entry_safe(se_cmd, tmp_cmd,
4197 &se_sess->sess_wait_list, se_cmd_list) {
4198 list_del(&se_cmd->se_cmd_list);
4199
4200 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4201 " %d\n", se_cmd, se_cmd->t_state,
4202 se_cmd->se_tfo->get_cmd_state(se_cmd));
4203
4204 if (wait_for_tasks) {
4205 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4206 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4207 se_cmd->se_tfo->get_cmd_state(se_cmd));
4208
4209 rc = transport_wait_for_tasks(se_cmd);
4210
4211 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4212 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4213 se_cmd->se_tfo->get_cmd_state(se_cmd));
4214 }
4215
4216 if (!rc) {
4217 wait_for_completion(&se_cmd->cmd_wait_comp);
4218 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4219 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4220 se_cmd->se_tfo->get_cmd_state(se_cmd));
4221 }
4222
4223 se_cmd->se_tfo->release_cmd(se_cmd);
4224 }
4225}
4226EXPORT_SYMBOL(target_wait_for_sess_cmds);
4227
c66ac9db
NB		 4228/* transport_lun_wait_for_tasks():
4229 *
4230 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4231 * an struct se_lun to be successfully shutdown.
4232 */
4233static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4234{
4235 unsigned long flags;
4236 int ret;
4237 /*
4238 * If the frontend has already requested this struct se_cmd to
4239 * be stopped, we can safely ignore this struct se_cmd.
4240 */
a1d8b49a 4241 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 4242 if (cmd->transport_state & CMD_T_STOP) {
4243 cmd->transport_state &= ~CMD_T_LUN_STOP;
4244
4245 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
4246 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4247 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4248 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4249 return -EPERM;
c66ac9db 4250 }
7d680f3b 4251 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 4252 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4253
5951146d 4254 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4255
4256 ret = transport_stop_tasks_for_cmd(cmd);
4257
6708bb27
AG		 4258 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4259 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4260 if (!ret) {
6708bb27 4261 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4262 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4263 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4264 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4265 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4266 }
3df8d40b 4267 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4268
4269 return 0;
4270}
4271
c66ac9db
NB		 4272static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4273{
4274 struct se_cmd *cmd = NULL;
4275 unsigned long lun_flags, cmd_flags;
4276 /*
4277 * Do exception processing and return CHECK_CONDITION status to the
4278 * Initiator Port.
4279 */
4280 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4281 while (!list_empty(&lun->lun_cmd_list)) {
4282 cmd = list_first_entry(&lun->lun_cmd_list,
4283 struct se_cmd, se_lun_node);
3d26fea0 4284 list_del_init(&cmd->se_lun_node);
5951146d 4285
c66ac9db
NB		 4286 /*
4287 * This will notify iscsi_target_transport.c:
4288 * transport_cmd_check_stop() that a LUN shutdown is in
4289 * progress for the iscsi_cmd_t.
4290 */
a1d8b49a 4291 spin_lock(&cmd->t_state_lock);
6708bb27 4292 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4293 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4294 cmd->se_lun->unpacked_lun,
4295 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 4296 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 4297 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4298
4299 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4300
6708bb27
AG		 4301 if (!cmd->se_lun) {
4302 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4303 cmd->se_tfo->get_task_tag(cmd),
4304 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4305 BUG();
4306 }
4307 /*
4308 * If the Storage engine still owns the iscsi_cmd_t, determine
4309 * and/or stop its context.
4310 */
6708bb27 4311 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4312 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4313 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4314
e3d6f909 4315 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4316 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4317 continue;
4318 }
4319
6708bb27 4320 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4321 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4322 cmd->se_lun->unpacked_lun,
4323 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4324
a1d8b49a 4325 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 4326 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 4327 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4328 goto check_cond;
4329 }
7d680f3b 4330 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
c66ac9db 4331 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4332 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4333
4334 transport_free_dev_tasks(cmd);
4335 /*
4336 * The Storage engine stopped this struct se_cmd before it was
4337 * send to the fabric frontend for delivery back to the
4338 * Initiator Node. Return this SCSI CDB back with an
4339 * CHECK_CONDITION status.
4340 */
4341check_cond:
4342 transport_send_check_condition_and_sense(cmd,
4343 TCM_NON_EXISTENT_LUN, 0);
4344 /*
4345 * If the fabric frontend is waiting for this iscsi_cmd_t to
4346 * be released, notify the waiting thread now that LU has
4347 * finished accessing it.
4348 */
a1d8b49a 4349 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 4350 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 4351 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4352 " struct se_cmd: %p ITT: 0x%08x\n",
4353 lun->unpacked_lun,
e3d6f909 4354 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4355
a1d8b49a 4356 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4357 cmd_flags);
4358 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4359 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4360 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4361 continue;
4362 }
6708bb27 4363 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4364 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4365
a1d8b49a 4366 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4367 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4368 }
4369 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4370}
4371
4372static int transport_clear_lun_thread(void *p)
4373{
8359cf43 4374 struct se_lun *lun = p;
c66ac9db
NB		 4375
4376 __transport_clear_lun_from_sessions(lun);
4377 complete(&lun->lun_shutdown_comp);
4378
4379 return 0;
4380}
4381
4382int transport_clear_lun_from_sessions(struct se_lun *lun)
4383{
4384 struct task_struct *kt;
4385
5951146d 4386 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4387 "tcm_cl_%u", lun->unpacked_lun);
4388 if (IS_ERR(kt)) {
6708bb27 4389 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4390 return PTR_ERR(kt);
c66ac9db
NB		 4391 }
4392 wait_for_completion(&lun->lun_shutdown_comp);
4393
4394 return 0;
4395}
4396
d14921d6
NB		 4397/**
4398 * transport_wait_for_tasks - wait for completion to occur
4399 * @cmd: command to wait
c66ac9db 4400 *
d14921d6
NB		 4401 * Called from frontend fabric context to wait for storage engine
4402 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4403 */
a17f091d 4404bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4405{
4406 unsigned long flags;
4407
a1d8b49a 4408 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 4409 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
4410 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 4411 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4412 return false;
d14921d6
NB		 4413 }
4414 /*
4415 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4416 * has been set in transport_set_supported_SAM_opcode().
4417 */
c8e31f26
AG		 4418 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
4419 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 4420 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4421 return false;
d14921d6 4422 }
c66ac9db
NB		 4423 /*
4424 * If we are already stopped due to an external event (ie: LUN shutdown)
4425 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4426 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4427 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4428 * has completed its operation on the struct se_cmd.
4429 */
7d680f3b 4430 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 4431 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4432 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4433 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4434 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4435 /*
4436 * There is a special case for WRITES where a FE exception +
4437 * LUN shutdown means ConfigFS context is still sleeping on
4438 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4439 * We go ahead and up transport_lun_stop_comp just to be sure
4440 * here.
4441 */
a1d8b49a
AG		 4442 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4443 complete(&cmd->transport_lun_stop_comp);
4444 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4445 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4446
4447 transport_all_task_dev_remove_state(cmd);
4448 /*
4449 * At this point, the frontend who was the originator of this
4450 * struct se_cmd, now owns the structure and can be released through
4451 * normal means below.
4452 */
6708bb27 4453 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4454 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4455 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4456 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4457
7d680f3b 4458 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 4459 }
7d680f3b 4460
3d28934a 4461 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 4462 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4463 return false;
d14921d6 4464 }
c66ac9db 4465
7d680f3b 4466 cmd->transport_state |= CMD_T_STOP;
c66ac9db 4467
6708bb27 4468 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 4469 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 4470 cmd, cmd->se_tfo->get_task_tag(cmd),
4471 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4472
a1d8b49a 4473 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4474
5951146d 4475 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4476
a1d8b49a 4477 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4478
a1d8b49a 4479 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 4480 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 4481
6708bb27 4482 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4483 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4484 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4485
d14921d6 4486 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4487
4488 return true;
c66ac9db 4489}
d14921d6 4490EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4491
4492static int transport_get_sense_codes(
4493 struct se_cmd *cmd,
4494 u8 *asc,
4495 u8 *ascq)
4496{
4497 *asc = cmd->scsi_asc;
4498 *ascq = cmd->scsi_ascq;
4499
4500 return 0;
4501}
4502
4503static int transport_set_sense_codes(
4504 struct se_cmd *cmd,
4505 u8 asc,
4506 u8 ascq)
4507{
4508 cmd->scsi_asc = asc;
4509 cmd->scsi_ascq = ascq;
4510
4511 return 0;
4512}
4513
4514int transport_send_check_condition_and_sense(
4515 struct se_cmd *cmd,
4516 u8 reason,
4517 int from_transport)
4518{
4519 unsigned char *buffer = cmd->sense_buffer;
4520 unsigned long flags;
4521 int offset;
4522 u8 asc = 0, ascq = 0;
4523
a1d8b49a 4524 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4525 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4526 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4527 return 0;
4528 }
4529 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4530 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4531
4532 if (!reason && from_transport)
4533 goto after_reason;
4534
4535 if (!from_transport)
4536 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4537 /*
4538 * Data Segment and SenseLength of the fabric response PDU.
4539 *
4540 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4541 * from include/scsi/scsi_cmnd.h
4542 */
e3d6f909 4543 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4544 TRANSPORT_SENSE_BUFFER);
4545 /*
4546 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4547 * SENSE KEY values from include/scsi/scsi.h
4548 */
4549 switch (reason) {
4550 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4551 /* CURRENT ERROR */
4552 buffer[offset] = 0x70;
895f3022 4553 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 4554 /* ILLEGAL REQUEST */
4555 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4556 /* LOGICAL UNIT NOT SUPPORTED */
4557 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4558 break;
c66ac9db
NB		 4559 case TCM_UNSUPPORTED_SCSI_OPCODE:
4560 case TCM_SECTOR_COUNT_TOO_MANY:
4561 /* CURRENT ERROR */
4562 buffer[offset] = 0x70;
895f3022 4563 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4564 /* ILLEGAL REQUEST */
4565 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4566 /* INVALID COMMAND OPERATION CODE */
4567 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4568 break;
4569 case TCM_UNKNOWN_MODE_PAGE:
4570 /* CURRENT ERROR */
4571 buffer[offset] = 0x70;
895f3022 4572 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4573 /* ILLEGAL REQUEST */
4574 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4575 /* INVALID FIELD IN CDB */
4576 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4577 break;
4578 case TCM_CHECK_CONDITION_ABORT_CMD:
4579 /* CURRENT ERROR */
4580 buffer[offset] = 0x70;
895f3022 4581 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4582 /* ABORTED COMMAND */
4583 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4584 /* BUS DEVICE RESET FUNCTION OCCURRED */
4585 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4586 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4587 break;
4588 case TCM_INCORRECT_AMOUNT_OF_DATA:
4589 /* CURRENT ERROR */
4590 buffer[offset] = 0x70;
895f3022 4591 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4592 /* ABORTED COMMAND */
4593 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4594 /* WRITE ERROR */
4595 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4596 /* NOT ENOUGH UNSOLICITED DATA */
4597 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4598 break;
4599 case TCM_INVALID_CDB_FIELD:
4600 /* CURRENT ERROR */
4601 buffer[offset] = 0x70;
895f3022 4602 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4603 /* ILLEGAL REQUEST */
4604 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4605 /* INVALID FIELD IN CDB */
4606 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4607 break;
4608 case TCM_INVALID_PARAMETER_LIST:
4609 /* CURRENT ERROR */
4610 buffer[offset] = 0x70;
895f3022 4611 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4612 /* ILLEGAL REQUEST */
4613 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4614 /* INVALID FIELD IN PARAMETER LIST */
4615 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4616 break;
4617 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4618 /* CURRENT ERROR */
4619 buffer[offset] = 0x70;
895f3022 4620 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4621 /* ABORTED COMMAND */
4622 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4623 /* WRITE ERROR */
4624 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4625 /* UNEXPECTED_UNSOLICITED_DATA */
4626 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4627 break;
4628 case TCM_SERVICE_CRC_ERROR:
4629 /* CURRENT ERROR */
4630 buffer[offset] = 0x70;
895f3022 4631 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4632 /* ABORTED COMMAND */
4633 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4634 /* PROTOCOL SERVICE CRC ERROR */
4635 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4636 /* N/A */
4637 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4638 break;
4639 case TCM_SNACK_REJECTED:
4640 /* CURRENT ERROR */
4641 buffer[offset] = 0x70;
895f3022 4642 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4643 /* ABORTED COMMAND */
4644 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4645 /* READ ERROR */
4646 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4647 /* FAILED RETRANSMISSION REQUEST */
4648 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4649 break;
4650 case TCM_WRITE_PROTECTED:
4651 /* CURRENT ERROR */
4652 buffer[offset] = 0x70;
895f3022 4653 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4654 /* DATA PROTECT */
4655 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4656 /* WRITE PROTECTED */
4657 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4658 break;
4659 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4660 /* CURRENT ERROR */
4661 buffer[offset] = 0x70;
895f3022 4662 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4663 /* UNIT ATTENTION */
4664 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4665 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4666 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4667 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4668 break;
4669 case TCM_CHECK_CONDITION_NOT_READY:
4670 /* CURRENT ERROR */
4671 buffer[offset] = 0x70;
895f3022 4672 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4673 /* Not Ready */
4674 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4675 transport_get_sense_codes(cmd, &asc, &ascq);
4676 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4677 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4678 break;
4679 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4680 default:
4681 /* CURRENT ERROR */
4682 buffer[offset] = 0x70;
895f3022 4683 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4684 /* ILLEGAL REQUEST */
4685 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4686 /* LOGICAL UNIT COMMUNICATION FAILURE */
4687 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4688 break;
4689 }
4690 /*
4691 * This code uses linux/include/scsi/scsi.h SAM status codes!
4692 */
4693 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4694 /*
4695 * Automatically padded, this value is encoded in the fabric's
4696 * data_length response PDU containing the SCSI defined sense data.
4697 */
4698 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4699
4700after_reason:
07bde79a 4701 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4702}
4703EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4704
4705int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4706{
4707 int ret = 0;
4708
7d680f3b 4709 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 4710 if (!send_status ||
c66ac9db
NB		 4711 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4712 return 1;
4713#if 0
6708bb27 4714 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4715 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4716 cmd->t_task_cdb[0],
e3d6f909 4717 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4718#endif
4719 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4720 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4721 ret = 1;
4722 }
4723 return ret;
4724}
4725EXPORT_SYMBOL(transport_check_aborted_status);
4726
4727void transport_send_task_abort(struct se_cmd *cmd)
4728{
c252f003
NB		 4729 unsigned long flags;
4730
4731 spin_lock_irqsave(&cmd->t_state_lock, flags);
4732 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4733 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4734 return;
4735 }
4736 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4737
c66ac9db
NB		 4738 /*
4739 * If there are still expected incoming fabric WRITEs, we wait
4740 * until until they have completed before sending a TASK_ABORTED
4741 * response. This response with TASK_ABORTED status will be
4742 * queued back to fabric module by transport_check_aborted_status().
4743 */
4744 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4745 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 4746 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 4747 smp_mb__after_atomic_inc();
c66ac9db
NB		 4748 }
4749 }
4750 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4751#if 0
6708bb27 4752 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4753 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4754 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4755#endif
e3d6f909 4756 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4757}
4758
e26d99ae 4759static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4760{
5951146d 4761 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4762 struct se_tmr_req *tmr = cmd->se_tmr_req;
4763 int ret;
4764
4765 switch (tmr->function) {
5c6cd613 4766 case TMR_ABORT_TASK:
3d28934a 4767 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 4768 break;
5c6cd613
NB		 4769 case TMR_ABORT_TASK_SET:
4770 case TMR_CLEAR_ACA:
4771 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4772 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4773 break;
5c6cd613 4774 case TMR_LUN_RESET:
c66ac9db
NB		 4775 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4776 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4777 TMR_FUNCTION_REJECTED;
4778 break;
5c6cd613 4779 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4780 tmr->response = TMR_FUNCTION_REJECTED;
4781 break;
5c6cd613 4782 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4783 tmr->response = TMR_FUNCTION_REJECTED;
4784 break;
c66ac9db 4785 default:
6708bb27 4786 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4787 tmr->function);
4788 tmr->response = TMR_FUNCTION_REJECTED;
4789 break;
4790 }
4791
4792 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4793 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4794
b7b8bef7 4795 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4796 return 0;
4797}
4798
c66ac9db
NB		 4799/* transport_processing_thread():
4800 *
4801 *
4802 */
4803static int transport_processing_thread(void *param)
4804{
5951146d 4805 int ret;
c66ac9db 4806 struct se_cmd *cmd;
8359cf43 4807 struct se_device *dev = param;
c66ac9db 4808
c66ac9db 4809 while (!kthread_should_stop()) {
e3d6f909
AG		 4810 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4811 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4812 kthread_should_stop());
4813 if (ret < 0)
4814 goto out;
4815
c66ac9db 4816get_cmd:
5951146d
AG		 4817 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4818 if (!cmd)
c66ac9db
NB		 4819 continue;
4820
5951146d 4821 switch (cmd->t_state) {
680b73c5
CH		 4822 case TRANSPORT_NEW_CMD:
4823 BUG();
4824 break;
c66ac9db 4825 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4826 if (!cmd->se_tfo->new_cmd_map) {
4827 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4828 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4829 BUG();
4830 }
e3d6f909 4831 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4832 if (ret < 0) {
03e98c9e 4833 transport_generic_request_failure(cmd);
c66ac9db
NB		 4834 break;
4835 }
c66ac9db 4836 ret = transport_generic_new_cmd(cmd);
f147abb4 4837 if (ret < 0) {
03e98c9e
NB		 4838 transport_generic_request_failure(cmd);
4839 break;
c66ac9db
NB		 4840 }
4841 break;
4842 case TRANSPORT_PROCESS_WRITE:
4843 transport_generic_process_write(cmd);
4844 break;
c66ac9db
NB		 4845 case TRANSPORT_PROCESS_TMR:
4846 transport_generic_do_tmr(cmd);
4847 break;
07bde79a 4848 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4849 transport_write_pending_qf(cmd);
4850 break;
4851 case TRANSPORT_COMPLETE_QF_OK:
4852 transport_complete_qf(cmd);
07bde79a 4853 break;
c66ac9db 4854 default:
f2da9dbd
CH		 4855 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4856 "i_state: %d on SE LUN: %u\n",
4857 cmd->t_state,
e3d6f909
AG		 4858 cmd->se_tfo->get_task_tag(cmd),
4859 cmd->se_tfo->get_cmd_state(cmd),
4860 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4861 BUG();
4862 }
4863
4864 goto get_cmd;
4865 }
4866
4867out:
ce8762f6
NB		 4868 WARN_ON(!list_empty(&dev->state_task_list));
4869 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4870 dev->process_thread = NULL;
4871 return 0;
4872}
Linux kernel - Deliverables
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