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target: add back error handling in transport_complete_task
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
39#include <asm/unaligned.h>
40#include <net/sock.h>
41#include <net/tcp.h>
42#include <scsi/scsi.h>
43#include <scsi/scsi_cmnd.h>
e66ecd50 44#include <scsi/scsi_tcq.h>
c66ac9db
NB		 45
46#include <target/target_core_base.h>
47#include <target/target_core_device.h>
48#include <target/target_core_tmr.h>
49#include <target/target_core_tpg.h>
50#include <target/target_core_transport.h>
51#include <target/target_core_fabric_ops.h>
52#include <target/target_core_configfs.h>
53
54#include "target_core_alua.h"
55#include "target_core_hba.h"
56#include "target_core_pr.h"
c66ac9db
NB		 57#include "target_core_ua.h"
58
e3d6f909 59static int sub_api_initialized;
c66ac9db 60
35e0e757 61static struct workqueue_struct *target_completion_wq;
c66ac9db
NB		 62static struct kmem_cache *se_cmd_cache;
63static struct kmem_cache *se_sess_cache;
64struct kmem_cache *se_tmr_req_cache;
65struct kmem_cache *se_ua_cache;
c66ac9db
NB		 66struct kmem_cache *t10_pr_reg_cache;
67struct kmem_cache *t10_alua_lu_gp_cache;
68struct kmem_cache *t10_alua_lu_gp_mem_cache;
69struct kmem_cache *t10_alua_tg_pt_gp_cache;
70struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
71
c66ac9db 72static int transport_generic_write_pending(struct se_cmd *);
5951146d 73static int transport_processing_thread(void *param);
c66ac9db
NB		 74static int __transport_execute_tasks(struct se_device *dev);
75static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 76static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 77 struct se_device *dev);
c66ac9db 78static void transport_free_dev_tasks(struct se_cmd *cmd);
05d1c7c0 79static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 80static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 81static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 82static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
35e0e757
CH		 83static void transport_generic_request_failure(struct se_cmd *, int, int);
84static void target_complete_ok_work(struct work_struct *work);
c66ac9db 85
e3d6f909 86int init_se_kmem_caches(void)
c66ac9db 87{
c66ac9db
NB		 88 se_cmd_cache = kmem_cache_create("se_cmd_cache",
89 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
6708bb27
AG		 90 if (!se_cmd_cache) {
91 pr_err("kmem_cache_create for struct se_cmd failed\n");
c66ac9db
NB		 92 goto out;
93 }
94 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
95 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
96 0, NULL);
6708bb27
AG		 97 if (!se_tmr_req_cache) {
98 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db 99 " failed\n");
35e0e757 100 goto out_free_cmd_cache;
c66ac9db
NB		 101 }
102 se_sess_cache = kmem_cache_create("se_sess_cache",
103 sizeof(struct se_session), __alignof__(struct se_session),
104 0, NULL);
6708bb27
AG		 105 if (!se_sess_cache) {
106 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 107 " failed\n");
35e0e757 108 goto out_free_tmr_req_cache;
c66ac9db
NB		 109 }
110 se_ua_cache = kmem_cache_create("se_ua_cache",
111 sizeof(struct se_ua), __alignof__(struct se_ua),
112 0, NULL);
6708bb27
AG		 113 if (!se_ua_cache) {
114 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 115 goto out_free_sess_cache;
c66ac9db 116 }
c66ac9db
NB		 117 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
118 sizeof(struct t10_pr_registration),
119 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 120 if (!t10_pr_reg_cache) {
121 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 122 " failed\n");
35e0e757 123 goto out_free_ua_cache;
c66ac9db
NB		 124 }
125 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
126 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
127 0, NULL);
6708bb27
AG		 128 if (!t10_alua_lu_gp_cache) {
129 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 130 " failed\n");
35e0e757 131 goto out_free_pr_reg_cache;
c66ac9db
NB		 132 }
133 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
134 sizeof(struct t10_alua_lu_gp_member),
135 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 136 if (!t10_alua_lu_gp_mem_cache) {
137 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 138 "cache failed\n");
35e0e757 139 goto out_free_lu_gp_cache;
c66ac9db
NB		 140 }
141 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
142 sizeof(struct t10_alua_tg_pt_gp),
143 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 144 if (!t10_alua_tg_pt_gp_cache) {
145 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 146 "cache failed\n");
35e0e757 147 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 148 }
149 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
150 "t10_alua_tg_pt_gp_mem_cache",
151 sizeof(struct t10_alua_tg_pt_gp_member),
152 __alignof__(struct t10_alua_tg_pt_gp_member),
153 0, NULL);
6708bb27
AG		 154 if (!t10_alua_tg_pt_gp_mem_cache) {
155 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 156 "mem_t failed\n");
35e0e757 157 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 158 }
159
35e0e757
CH		 160 target_completion_wq = alloc_workqueue("target_completion",
161 WQ_MEM_RECLAIM, 0);
162 if (!target_completion_wq)
163 goto out_free_tg_pt_gp_mem_cache;
164
c66ac9db 165 return 0;
35e0e757
CH		 166
167out_free_tg_pt_gp_mem_cache:
168 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
169out_free_tg_pt_gp_cache:
170 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
171out_free_lu_gp_mem_cache:
172 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
173out_free_lu_gp_cache:
174 kmem_cache_destroy(t10_alua_lu_gp_cache);
175out_free_pr_reg_cache:
176 kmem_cache_destroy(t10_pr_reg_cache);
177out_free_ua_cache:
178 kmem_cache_destroy(se_ua_cache);
179out_free_sess_cache:
180 kmem_cache_destroy(se_sess_cache);
181out_free_tmr_req_cache:
182 kmem_cache_destroy(se_tmr_req_cache);
183out_free_cmd_cache:
184 kmem_cache_destroy(se_cmd_cache);
c66ac9db 185out:
e3d6f909 186 return -ENOMEM;
c66ac9db
NB		 187}
188
e3d6f909 189void release_se_kmem_caches(void)
c66ac9db 190{
35e0e757 191 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 192 kmem_cache_destroy(se_cmd_cache);
193 kmem_cache_destroy(se_tmr_req_cache);
194 kmem_cache_destroy(se_sess_cache);
195 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 196 kmem_cache_destroy(t10_pr_reg_cache);
197 kmem_cache_destroy(t10_alua_lu_gp_cache);
198 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
199 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
200 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 201}
202
e3d6f909
AG		 203/* This code ensures unique mib indexes are handed out. */
204static DEFINE_SPINLOCK(scsi_mib_index_lock);
205static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 206
207/*
208 * Allocate a new row index for the entry type specified
209 */
210u32 scsi_get_new_index(scsi_index_t type)
211{
212 u32 new_index;
213
e3d6f909 214 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 215
e3d6f909
AG		 216 spin_lock(&scsi_mib_index_lock);
217 new_index = ++scsi_mib_index[type];
218 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 219
220 return new_index;
221}
222
c66ac9db
NB		 223void transport_init_queue_obj(struct se_queue_obj *qobj)
224{
225 atomic_set(&qobj->queue_cnt, 0);
226 INIT_LIST_HEAD(&qobj->qobj_list);
227 init_waitqueue_head(&qobj->thread_wq);
228 spin_lock_init(&qobj->cmd_queue_lock);
229}
230EXPORT_SYMBOL(transport_init_queue_obj);
231
dbc5623e 232void transport_subsystem_check_init(void)
c66ac9db
NB		 233{
234 int ret;
235
dbc5623e
NB		 236 if (sub_api_initialized)
237 return;
238
c66ac9db
NB		 239 ret = request_module("target_core_iblock");
240 if (ret != 0)
6708bb27 241 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 242
243 ret = request_module("target_core_file");
244 if (ret != 0)
6708bb27 245 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 246
247 ret = request_module("target_core_pscsi");
248 if (ret != 0)
6708bb27 249 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 250
251 ret = request_module("target_core_stgt");
252 if (ret != 0)
6708bb27 253 pr_err("Unable to load target_core_stgt\n");
c66ac9db 254
e3d6f909 255 sub_api_initialized = 1;
dbc5623e 256 return;
c66ac9db
NB		 257}
258
259struct se_session *transport_init_session(void)
260{
261 struct se_session *se_sess;
262
263 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 264 if (!se_sess) {
265 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 266 " se_sess_cache\n");
267 return ERR_PTR(-ENOMEM);
268 }
269 INIT_LIST_HEAD(&se_sess->sess_list);
270 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 271
272 return se_sess;
273}
274EXPORT_SYMBOL(transport_init_session);
275
276/*
277 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
278 */
279void __transport_register_session(
280 struct se_portal_group *se_tpg,
281 struct se_node_acl *se_nacl,
282 struct se_session *se_sess,
283 void *fabric_sess_ptr)
284{
285 unsigned char buf[PR_REG_ISID_LEN];
286
287 se_sess->se_tpg = se_tpg;
288 se_sess->fabric_sess_ptr = fabric_sess_ptr;
289 /*
290 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
291 *
292 * Only set for struct se_session's that will actually be moving I/O.
293 * eg: *NOT* discovery sessions.
294 */
295 if (se_nacl) {
296 /*
297 * If the fabric module supports an ISID based TransportID,
298 * save this value in binary from the fabric I_T Nexus now.
299 */
e3d6f909 300 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 301 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 302 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 303 &buf[0], PR_REG_ISID_LEN);
304 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
305 }
306 spin_lock_irq(&se_nacl->nacl_sess_lock);
307 /*
308 * The se_nacl->nacl_sess pointer will be set to the
309 * last active I_T Nexus for each struct se_node_acl.
310 */
311 se_nacl->nacl_sess = se_sess;
312
313 list_add_tail(&se_sess->sess_acl_list,
314 &se_nacl->acl_sess_list);
315 spin_unlock_irq(&se_nacl->nacl_sess_lock);
316 }
317 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
318
6708bb27 319 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 320 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 321}
322EXPORT_SYMBOL(__transport_register_session);
323
324void transport_register_session(
325 struct se_portal_group *se_tpg,
326 struct se_node_acl *se_nacl,
327 struct se_session *se_sess,
328 void *fabric_sess_ptr)
329{
330 spin_lock_bh(&se_tpg->session_lock);
331 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
332 spin_unlock_bh(&se_tpg->session_lock);
333}
334EXPORT_SYMBOL(transport_register_session);
335
336void transport_deregister_session_configfs(struct se_session *se_sess)
337{
338 struct se_node_acl *se_nacl;
23388864 339 unsigned long flags;
c66ac9db
NB		 340 /*
341 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
342 */
343 se_nacl = se_sess->se_node_acl;
6708bb27 344 if (se_nacl) {
23388864 345 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 346 list_del(&se_sess->sess_acl_list);
347 /*
348 * If the session list is empty, then clear the pointer.
349 * Otherwise, set the struct se_session pointer from the tail
350 * element of the per struct se_node_acl active session list.
351 */
352 if (list_empty(&se_nacl->acl_sess_list))
353 se_nacl->nacl_sess = NULL;
354 else {
355 se_nacl->nacl_sess = container_of(
356 se_nacl->acl_sess_list.prev,
357 struct se_session, sess_acl_list);
358 }
23388864 359 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 360 }
361}
362EXPORT_SYMBOL(transport_deregister_session_configfs);
363
364void transport_free_session(struct se_session *se_sess)
365{
366 kmem_cache_free(se_sess_cache, se_sess);
367}
368EXPORT_SYMBOL(transport_free_session);
369
370void transport_deregister_session(struct se_session *se_sess)
371{
372 struct se_portal_group *se_tpg = se_sess->se_tpg;
373 struct se_node_acl *se_nacl;
e63a8e19 374 unsigned long flags;
c66ac9db 375
6708bb27 376 if (!se_tpg) {
c66ac9db
NB		 377 transport_free_session(se_sess);
378 return;
379 }
c66ac9db 380
e63a8e19 381 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 382 list_del(&se_sess->sess_list);
383 se_sess->se_tpg = NULL;
384 se_sess->fabric_sess_ptr = NULL;
e63a8e19 385 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 386
387 /*
388 * Determine if we need to do extra work for this initiator node's
389 * struct se_node_acl if it had been previously dynamically generated.
390 */
391 se_nacl = se_sess->se_node_acl;
6708bb27 392 if (se_nacl) {
e63a8e19 393 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 394 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 395 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
396 se_tpg)) {
c66ac9db
NB		 397 list_del(&se_nacl->acl_list);
398 se_tpg->num_node_acls--;
e63a8e19 399 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 400
401 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 402 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 403 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 404 se_nacl);
e63a8e19 405 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 406 }
407 }
e63a8e19 408 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 409 }
410
411 transport_free_session(se_sess);
412
6708bb27 413 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 414 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 415}
416EXPORT_SYMBOL(transport_deregister_session);
417
418/*
a1d8b49a 419 * Called with cmd->t_state_lock held.
c66ac9db
NB		 420 */
421static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
422{
42bf829e 423 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 424 struct se_task *task;
425 unsigned long flags;
426
42bf829e
CH		 427 if (!dev)
428 return;
c66ac9db 429
42bf829e 430 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 431 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 432 continue;
433
6708bb27 434 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 435 continue;
436
437 spin_lock_irqsave(&dev->execute_task_lock, flags);
438 list_del(&task->t_state_list);
6708bb27
AG		 439 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
440 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 441 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
442
443 atomic_set(&task->task_state_active, 0);
a1d8b49a 444 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 445 }
446}
447
448/* transport_cmd_check_stop():
449 *
450 * 'transport_off = 1' determines if t_transport_active should be cleared.
451 * 'transport_off = 2' determines if task_dev_state should be removed.
452 *
453 * A non-zero u8 t_state sets cmd->t_state.
454 * Returns 1 when command is stopped, else 0.
455 */
456static int transport_cmd_check_stop(
457 struct se_cmd *cmd,
458 int transport_off,
459 u8 t_state)
460{
461 unsigned long flags;
462
a1d8b49a 463 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 464 /*
465 * Determine if IOCTL context caller in requesting the stopping of this
466 * command for LUN shutdown purposes.
467 */
a1d8b49a 468 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 469 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 470 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 471 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 472
a1d8b49a 473 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 474 if (transport_off == 2)
475 transport_all_task_dev_remove_state(cmd);
a1d8b49a 476 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 477
a1d8b49a 478 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 479 return 1;
480 }
481 /*
482 * Determine if frontend context caller is requesting the stopping of
e3d6f909 483 * this command for frontend exceptions.
c66ac9db 484 */
a1d8b49a 485 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 486 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 487 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 488 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 489
c66ac9db
NB		 490 if (transport_off == 2)
491 transport_all_task_dev_remove_state(cmd);
492
493 /*
494 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
495 * to FE.
496 */
497 if (transport_off == 2)
498 cmd->se_lun = NULL;
a1d8b49a 499 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 500
a1d8b49a 501 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 502 return 1;
503 }
504 if (transport_off) {
a1d8b49a 505 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 506 if (transport_off == 2) {
507 transport_all_task_dev_remove_state(cmd);
508 /*
509 * Clear struct se_cmd->se_lun before the transport_off == 2
510 * handoff to fabric module.
511 */
512 cmd->se_lun = NULL;
513 /*
514 * Some fabric modules like tcm_loop can release
25985edc 515 * their internally allocated I/O reference now and
c66ac9db 516 * struct se_cmd now.
88dd9e26
NB		 517 *
518 * Fabric modules are expected to return '1' here if the
519 * se_cmd being passed is released at this point,
520 * or zero if not being released.
c66ac9db 521 */
e3d6f909 522 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 523 spin_unlock_irqrestore(
a1d8b49a 524 &cmd->t_state_lock, flags);
c66ac9db 525
88dd9e26 526 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 527 }
528 }
a1d8b49a 529 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 530
531 return 0;
532 } else if (t_state)
533 cmd->t_state = t_state;
a1d8b49a 534 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 535
536 return 0;
537}
538
539static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
540{
541 return transport_cmd_check_stop(cmd, 2, 0);
542}
543
544static void transport_lun_remove_cmd(struct se_cmd *cmd)
545{
e3d6f909 546 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 547 unsigned long flags;
548
549 if (!lun)
550 return;
551
a1d8b49a 552 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 553 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 554 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 555 goto check_lun;
556 }
a1d8b49a 557 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 558 transport_all_task_dev_remove_state(cmd);
a1d8b49a 559 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 560
c66ac9db
NB		 561
562check_lun:
563 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 564 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 565 list_del(&cmd->se_lun_node);
a1d8b49a 566 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 567#if 0
6708bb27 568 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 569 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 570#endif
571 }
572 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
573}
574
575void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
576{
8dc52b54
NB		 577 if (!cmd->se_tmr_req)
578 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 579
580 if (transport_cmd_check_stop_to_fabric(cmd))
581 return;
77039d1e 582 if (remove) {
3df8d40b 583 transport_remove_cmd_from_queue(cmd);
e6a2573f 584 transport_put_cmd(cmd);
77039d1e 585 }
c66ac9db
NB		 586}
587
f7a5cc0b
CH		 588static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
589 bool at_head)
c66ac9db
NB		 590{
591 struct se_device *dev = cmd->se_dev;
e3d6f909 592 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 593 unsigned long flags;
594
c66ac9db 595 if (t_state) {
a1d8b49a 596 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 597 cmd->t_state = t_state;
a1d8b49a
AG		 598 atomic_set(&cmd->t_transport_active, 1);
599 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 600 }
601
602 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 603
604 /* If the cmd is already on the list, remove it before we add it */
605 if (!list_empty(&cmd->se_queue_node))
606 list_del(&cmd->se_queue_node);
607 else
608 atomic_inc(&qobj->queue_cnt);
609
f7a5cc0b 610 if (at_head)
07bde79a 611 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 612 else
07bde79a 613 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 614 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 615 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
616
c66ac9db 617 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 618}
619
5951146d
AG		 620static struct se_cmd *
621transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 622{
5951146d 623 struct se_cmd *cmd;
c66ac9db
NB		 624 unsigned long flags;
625
626 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
627 if (list_empty(&qobj->qobj_list)) {
628 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
629 return NULL;
630 }
5951146d 631 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 632
79a7fef2 633 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 634
79a7fef2 635 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 636 atomic_dec(&qobj->queue_cnt);
637 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
638
5951146d 639 return cmd;
c66ac9db
NB		 640}
641
3df8d40b 642static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 643{
3df8d40b 644 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 645 unsigned long flags;
646
647 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 648 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 649 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
650 return;
651 }
79a7fef2
RD		 652 atomic_set(&cmd->t_transport_queue_active, 0);
653 atomic_dec(&qobj->queue_cnt);
654 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 655 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
656
a1d8b49a 657 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 658 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 659 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 660 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 661 }
662}
663
664/*
665 * Completion function used by TCM subsystem plugins (such as FILEIO)
666 * for queueing up response from struct se_subsystem_api->do_task()
667 */
668void transport_complete_sync_cache(struct se_cmd *cmd, int good)
669{
a1d8b49a 670 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 671 struct se_task, t_list);
672
673 if (good) {
674 cmd->scsi_status = SAM_STAT_GOOD;
675 task->task_scsi_status = GOOD;
676 } else {
677 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
678 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 679 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 680 PYX_TRANSPORT_ILLEGAL_REQUEST;
681 }
682
683 transport_complete_task(task, good);
684}
685EXPORT_SYMBOL(transport_complete_sync_cache);
686
35e0e757
CH		 687static void target_complete_failure_work(struct work_struct *work)
688{
689 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
690
691 transport_generic_request_failure(cmd, 1, 1);
692}
693
c66ac9db
NB		 694/* transport_complete_task():
695 *
696 * Called from interrupt and non interrupt context depending
697 * on the transport plugin.
698 */
699void transport_complete_task(struct se_task *task, int success)
700{
e3d6f909 701 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 702 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 703 unsigned long flags;
704#if 0
6708bb27 705 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 706 cmd->t_task_cdb[0], dev);
c66ac9db 707#endif
e3d6f909 708 if (dev)
c66ac9db 709 atomic_inc(&dev->depth_left);
c66ac9db 710
a1d8b49a 711 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 712 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 713
714 /*
715 * See if any sense data exists, if so set the TASK_SENSE flag.
716 * Also check for any other post completion work that needs to be
717 * done by the plugins.
718 */
719 if (dev && dev->transport->transport_complete) {
720 if (dev->transport->transport_complete(task) != 0) {
721 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
722 task->task_sense = 1;
723 success = 1;
724 }
725 }
726
727 /*
728 * See if we are waiting for outstanding struct se_task
729 * to complete for an exception condition
730 */
6c76bf95 731 if (task->task_flags & TF_REQUEST_STOP) {
a1d8b49a 732 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 733 complete(&task->task_stop_comp);
734 return;
735 }
2235007c
CH		 736
737 if (!success)
738 cmd->t_tasks_failed = 1;
739
c66ac9db
NB		 740 /*
741 * Decrement the outstanding t_task_cdbs_left count. The last
742 * struct se_task from struct se_cmd will complete itself into the
743 * device queue depending upon int success.
744 */
6708bb27 745 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
a1d8b49a 746 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 747 return;
748 }
749
2235007c 750 if (cmd->t_tasks_failed) {
c66ac9db
NB		 751 if (!task->task_error_status) {
752 task->task_error_status =
753 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
754 cmd->transport_error_status =
755 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
756 }
35e0e757 757 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 758 } else {
a1d8b49a 759 atomic_set(&cmd->t_transport_complete, 1);
35e0e757 760 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 761 }
35e0e757 762
35e0e757
CH		 763 cmd->t_state = TRANSPORT_COMPLETE;
764 atomic_set(&cmd->t_transport_active, 1);
a1d8b49a 765 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 766
35e0e757 767 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 768}
769EXPORT_SYMBOL(transport_complete_task);
770
771/*
772 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
773 * struct se_task list are ready to be added to the active execution list
774 * struct se_device
775
776 * Called with se_dev_t->execute_task_lock called.
777 */
778static inline int transport_add_task_check_sam_attr(
779 struct se_task *task,
780 struct se_task *task_prev,
781 struct se_device *dev)
782{
783 /*
784 * No SAM Task attribute emulation enabled, add to tail of
785 * execution queue
786 */
787 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
788 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
789 return 0;
790 }
791 /*
792 * HEAD_OF_QUEUE attribute for received CDB, which means
793 * the first task that is associated with a struct se_cmd goes to
794 * head of the struct se_device->execute_task_list, and task_prev
795 * after that for each subsequent task
796 */
e66ecd50 797 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 798 list_add(&task->t_execute_list,
799 (task_prev != NULL) ?
800 &task_prev->t_execute_list :
801 &dev->execute_task_list);
802
6708bb27 803 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 804 " in execution queue\n",
6708bb27 805 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 806 return 1;
807 }
808 /*
809 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
810 * transitioned from Dermant -> Active state, and are added to the end
811 * of the struct se_device->execute_task_list
812 */
813 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
814 return 0;
815}
816
817/* __transport_add_task_to_execute_queue():
818 *
819 * Called with se_dev_t->execute_task_lock called.
820 */
821static void __transport_add_task_to_execute_queue(
822 struct se_task *task,
823 struct se_task *task_prev,
824 struct se_device *dev)
825{
826 int head_of_queue;
827
828 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
829 atomic_inc(&dev->execute_tasks);
830
831 if (atomic_read(&task->task_state_active))
832 return;
833 /*
834 * Determine if this task needs to go to HEAD_OF_QUEUE for the
835 * state list as well. Running with SAM Task Attribute emulation
836 * will always return head_of_queue == 0 here
837 */
838 if (head_of_queue)
839 list_add(&task->t_state_list, (task_prev) ?
840 &task_prev->t_state_list :
841 &dev->state_task_list);
842 else
843 list_add_tail(&task->t_state_list, &dev->state_task_list);
844
845 atomic_set(&task->task_state_active, 1);
846
6708bb27 847 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 848 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 849 task, dev);
850}
851
852static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
853{
42bf829e 854 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 855 struct se_task *task;
856 unsigned long flags;
857
a1d8b49a
AG		 858 spin_lock_irqsave(&cmd->t_state_lock, flags);
859 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 860 if (atomic_read(&task->task_state_active))
861 continue;
862
863 spin_lock(&dev->execute_task_lock);
864 list_add_tail(&task->t_state_list, &dev->state_task_list);
865 atomic_set(&task->task_state_active, 1);
866
6708bb27
AG		 867 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
868 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 869 task->task_se_cmd), task, dev);
870
871 spin_unlock(&dev->execute_task_lock);
872 }
a1d8b49a 873 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 874}
875
876static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
877{
5951146d 878 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 879 struct se_task *task, *task_prev = NULL;
880 unsigned long flags;
881
882 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 883 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 884 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 885 continue;
886 /*
887 * __transport_add_task_to_execute_queue() handles the
888 * SAM Task Attribute emulation if enabled
889 */
890 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 891 task_prev = task;
892 }
893 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 894}
895
04629b7b
CH		 896void __transport_remove_task_from_execute_queue(struct se_task *task,
897 struct se_device *dev)
898{
899 list_del_init(&task->t_execute_list);
900 atomic_dec(&dev->execute_tasks);
901}
902
52208ae3 903void transport_remove_task_from_execute_queue(
c66ac9db
NB		 904 struct se_task *task,
905 struct se_device *dev)
906{
907 unsigned long flags;
908
04629b7b 909 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 910 return;
af57c3ac 911
c66ac9db 912 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 913 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 914 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
915}
916
07bde79a 917/*
f147abb4 918 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 919 */
920
921static void target_qf_do_work(struct work_struct *work)
922{
923 struct se_device *dev = container_of(work, struct se_device,
924 qf_work_queue);
bcac364a 925 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 926 struct se_cmd *cmd, *cmd_tmp;
927
928 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 929 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
930 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 931
bcac364a 932 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 933 list_del(&cmd->se_qf_node);
934 atomic_dec(&dev->dev_qf_count);
935 smp_mb__after_atomic_dec();
07bde79a 936
6708bb27 937 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 938 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 939 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 940 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
941 : "UNKNOWN");
f7a5cc0b
CH		 942
943 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 944 }
07bde79a
NB		 945}
946
c66ac9db
NB		 947unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
948{
949 switch (cmd->data_direction) {
950 case DMA_NONE:
951 return "NONE";
952 case DMA_FROM_DEVICE:
953 return "READ";
954 case DMA_TO_DEVICE:
955 return "WRITE";
956 case DMA_BIDIRECTIONAL:
957 return "BIDI";
958 default:
959 break;
960 }
961
962 return "UNKNOWN";
963}
964
965void transport_dump_dev_state(
966 struct se_device *dev,
967 char *b,
968 int *bl)
969{
970 *bl += sprintf(b + *bl, "Status: ");
971 switch (dev->dev_status) {
972 case TRANSPORT_DEVICE_ACTIVATED:
973 *bl += sprintf(b + *bl, "ACTIVATED");
974 break;
975 case TRANSPORT_DEVICE_DEACTIVATED:
976 *bl += sprintf(b + *bl, "DEACTIVATED");
977 break;
978 case TRANSPORT_DEVICE_SHUTDOWN:
979 *bl += sprintf(b + *bl, "SHUTDOWN");
980 break;
981 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
982 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
983 *bl += sprintf(b + *bl, "OFFLINE");
984 break;
985 default:
986 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
987 break;
988 }
989
990 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
991 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
992 dev->queue_depth);
993 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 994 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 995 *bl += sprintf(b + *bl, " ");
996}
997
c66ac9db
NB		 998void transport_dump_vpd_proto_id(
999 struct t10_vpd *vpd,
1000 unsigned char *p_buf,
1001 int p_buf_len)
1002{
1003 unsigned char buf[VPD_TMP_BUF_SIZE];
1004 int len;
1005
1006 memset(buf, 0, VPD_TMP_BUF_SIZE);
1007 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1008
1009 switch (vpd->protocol_identifier) {
1010 case 0x00:
1011 sprintf(buf+len, "Fibre Channel\n");
1012 break;
1013 case 0x10:
1014 sprintf(buf+len, "Parallel SCSI\n");
1015 break;
1016 case 0x20:
1017 sprintf(buf+len, "SSA\n");
1018 break;
1019 case 0x30:
1020 sprintf(buf+len, "IEEE 1394\n");
1021 break;
1022 case 0x40:
1023 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1024 " Protocol\n");
1025 break;
1026 case 0x50:
1027 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1028 break;
1029 case 0x60:
1030 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1031 break;
1032 case 0x70:
1033 sprintf(buf+len, "Automation/Drive Interface Transport"
1034 " Protocol\n");
1035 break;
1036 case 0x80:
1037 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1038 break;
1039 default:
1040 sprintf(buf+len, "Unknown 0x%02x\n",
1041 vpd->protocol_identifier);
1042 break;
1043 }
1044
1045 if (p_buf)
1046 strncpy(p_buf, buf, p_buf_len);
1047 else
6708bb27 1048 pr_debug("%s", buf);
c66ac9db
NB		 1049}
1050
1051void
1052transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1053{
1054 /*
1055 * Check if the Protocol Identifier Valid (PIV) bit is set..
1056 *
1057 * from spc3r23.pdf section 7.5.1
1058 */
1059 if (page_83[1] & 0x80) {
1060 vpd->protocol_identifier = (page_83[0] & 0xf0);
1061 vpd->protocol_identifier_set = 1;
1062 transport_dump_vpd_proto_id(vpd, NULL, 0);
1063 }
1064}
1065EXPORT_SYMBOL(transport_set_vpd_proto_id);
1066
1067int transport_dump_vpd_assoc(
1068 struct t10_vpd *vpd,
1069 unsigned char *p_buf,
1070 int p_buf_len)
1071{
1072 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1073 int ret = 0;
1074 int len;
c66ac9db
NB		 1075
1076 memset(buf, 0, VPD_TMP_BUF_SIZE);
1077 len = sprintf(buf, "T10 VPD Identifier Association: ");
1078
1079 switch (vpd->association) {
1080 case 0x00:
1081 sprintf(buf+len, "addressed logical unit\n");
1082 break;
1083 case 0x10:
1084 sprintf(buf+len, "target port\n");
1085 break;
1086 case 0x20:
1087 sprintf(buf+len, "SCSI target device\n");
1088 break;
1089 default:
1090 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1091 ret = -EINVAL;
c66ac9db
NB		 1092 break;
1093 }
1094
1095 if (p_buf)
1096 strncpy(p_buf, buf, p_buf_len);
1097 else
6708bb27 1098 pr_debug("%s", buf);
c66ac9db
NB		 1099
1100 return ret;
1101}
1102
1103int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1104{
1105 /*
1106 * The VPD identification association..
1107 *
1108 * from spc3r23.pdf Section 7.6.3.1 Table 297
1109 */
1110 vpd->association = (page_83[1] & 0x30);
1111 return transport_dump_vpd_assoc(vpd, NULL, 0);
1112}
1113EXPORT_SYMBOL(transport_set_vpd_assoc);
1114
1115int transport_dump_vpd_ident_type(
1116 struct t10_vpd *vpd,
1117 unsigned char *p_buf,
1118 int p_buf_len)
1119{
1120 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1121 int ret = 0;
1122 int len;
c66ac9db
NB		 1123
1124 memset(buf, 0, VPD_TMP_BUF_SIZE);
1125 len = sprintf(buf, "T10 VPD Identifier Type: ");
1126
1127 switch (vpd->device_identifier_type) {
1128 case 0x00:
1129 sprintf(buf+len, "Vendor specific\n");
1130 break;
1131 case 0x01:
1132 sprintf(buf+len, "T10 Vendor ID based\n");
1133 break;
1134 case 0x02:
1135 sprintf(buf+len, "EUI-64 based\n");
1136 break;
1137 case 0x03:
1138 sprintf(buf+len, "NAA\n");
1139 break;
1140 case 0x04:
1141 sprintf(buf+len, "Relative target port identifier\n");
1142 break;
1143 case 0x08:
1144 sprintf(buf+len, "SCSI name string\n");
1145 break;
1146 default:
1147 sprintf(buf+len, "Unsupported: 0x%02x\n",
1148 vpd->device_identifier_type);
e3d6f909 1149 ret = -EINVAL;
c66ac9db
NB		 1150 break;
1151 }
1152
e3d6f909
AG		 1153 if (p_buf) {
1154 if (p_buf_len < strlen(buf)+1)
1155 return -EINVAL;
c66ac9db 1156 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1157 } else {
6708bb27 1158 pr_debug("%s", buf);
e3d6f909 1159 }
c66ac9db
NB		 1160
1161 return ret;
1162}
1163
1164int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1165{
1166 /*
1167 * The VPD identifier type..
1168 *
1169 * from spc3r23.pdf Section 7.6.3.1 Table 298
1170 */
1171 vpd->device_identifier_type = (page_83[1] & 0x0f);
1172 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1173}
1174EXPORT_SYMBOL(transport_set_vpd_ident_type);
1175
1176int transport_dump_vpd_ident(
1177 struct t10_vpd *vpd,
1178 unsigned char *p_buf,
1179 int p_buf_len)
1180{
1181 unsigned char buf[VPD_TMP_BUF_SIZE];
1182 int ret = 0;
1183
1184 memset(buf, 0, VPD_TMP_BUF_SIZE);
1185
1186 switch (vpd->device_identifier_code_set) {
1187 case 0x01: /* Binary */
1188 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1189 &vpd->device_identifier[0]);
1190 break;
1191 case 0x02: /* ASCII */
1192 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1193 &vpd->device_identifier[0]);
1194 break;
1195 case 0x03: /* UTF-8 */
1196 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1197 &vpd->device_identifier[0]);
1198 break;
1199 default:
1200 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1201 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1202 ret = -EINVAL;
c66ac9db
NB		 1203 break;
1204 }
1205
1206 if (p_buf)
1207 strncpy(p_buf, buf, p_buf_len);
1208 else
6708bb27 1209 pr_debug("%s", buf);
c66ac9db
NB		 1210
1211 return ret;
1212}
1213
1214int
1215transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1216{
1217 static const char hex_str[] = "0123456789abcdef";
1218 int j = 0, i = 4; /* offset to start of the identifer */
1219
1220 /*
1221 * The VPD Code Set (encoding)
1222 *
1223 * from spc3r23.pdf Section 7.6.3.1 Table 296
1224 */
1225 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1226 switch (vpd->device_identifier_code_set) {
1227 case 0x01: /* Binary */
1228 vpd->device_identifier[j++] =
1229 hex_str[vpd->device_identifier_type];
1230 while (i < (4 + page_83[3])) {
1231 vpd->device_identifier[j++] =
1232 hex_str[(page_83[i] & 0xf0) >> 4];
1233 vpd->device_identifier[j++] =
1234 hex_str[page_83[i] & 0x0f];
1235 i++;
1236 }
1237 break;
1238 case 0x02: /* ASCII */
1239 case 0x03: /* UTF-8 */
1240 while (i < (4 + page_83[3]))
1241 vpd->device_identifier[j++] = page_83[i++];
1242 break;
1243 default:
1244 break;
1245 }
1246
1247 return transport_dump_vpd_ident(vpd, NULL, 0);
1248}
1249EXPORT_SYMBOL(transport_set_vpd_ident);
1250
1251static void core_setup_task_attr_emulation(struct se_device *dev)
1252{
1253 /*
1254 * If this device is from Target_Core_Mod/pSCSI, disable the
1255 * SAM Task Attribute emulation.
1256 *
1257 * This is currently not available in upsream Linux/SCSI Target
1258 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1259 */
e3d6f909 1260 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1261 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1262 return;
1263 }
1264
1265 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1266 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1267 " device\n", dev->transport->name,
1268 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1269}
1270
1271static void scsi_dump_inquiry(struct se_device *dev)
1272{
e3d6f909 1273 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1274 int i, device_type;
1275 /*
1276 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1277 */
6708bb27 1278 pr_debug(" Vendor: ");
c66ac9db
NB		 1279 for (i = 0; i < 8; i++)
1280 if (wwn->vendor[i] >= 0x20)
6708bb27 1281 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1282 else
6708bb27 1283 pr_debug(" ");
c66ac9db 1284
6708bb27 1285 pr_debug(" Model: ");
c66ac9db
NB		 1286 for (i = 0; i < 16; i++)
1287 if (wwn->model[i] >= 0x20)
6708bb27 1288 pr_debug("%c", wwn->model[i]);
c66ac9db 1289 else
6708bb27 1290 pr_debug(" ");
c66ac9db 1291
6708bb27 1292 pr_debug(" Revision: ");
c66ac9db
NB		 1293 for (i = 0; i < 4; i++)
1294 if (wwn->revision[i] >= 0x20)
6708bb27 1295 pr_debug("%c", wwn->revision[i]);
c66ac9db 1296 else
6708bb27 1297 pr_debug(" ");
c66ac9db 1298
6708bb27 1299 pr_debug("\n");
c66ac9db 1300
e3d6f909 1301 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1302 pr_debug(" Type: %s ", scsi_device_type(device_type));
1303 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1304 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1305}
1306
1307struct se_device *transport_add_device_to_core_hba(
1308 struct se_hba *hba,
1309 struct se_subsystem_api *transport,
1310 struct se_subsystem_dev *se_dev,
1311 u32 device_flags,
1312 void *transport_dev,
1313 struct se_dev_limits *dev_limits,
1314 const char *inquiry_prod,
1315 const char *inquiry_rev)
1316{
12a18bdc 1317 int force_pt;
c66ac9db
NB		 1318 struct se_device *dev;
1319
1320 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1321 if (!dev) {
1322 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1323 return NULL;
1324 }
c66ac9db 1325
e3d6f909 1326 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1327 dev->dev_flags = device_flags;
1328 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1329 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1330 dev->se_hba = hba;
1331 dev->se_sub_dev = se_dev;
1332 dev->transport = transport;
1333 atomic_set(&dev->active_cmds, 0);
1334 INIT_LIST_HEAD(&dev->dev_list);
1335 INIT_LIST_HEAD(&dev->dev_sep_list);
1336 INIT_LIST_HEAD(&dev->dev_tmr_list);
1337 INIT_LIST_HEAD(&dev->execute_task_list);
1338 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1339 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1340 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1341 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1342 spin_lock_init(&dev->execute_task_lock);
1343 spin_lock_init(&dev->delayed_cmd_lock);
1344 spin_lock_init(&dev->ordered_cmd_lock);
1345 spin_lock_init(&dev->state_task_lock);
1346 spin_lock_init(&dev->dev_alua_lock);
1347 spin_lock_init(&dev->dev_reservation_lock);
1348 spin_lock_init(&dev->dev_status_lock);
1349 spin_lock_init(&dev->dev_status_thr_lock);
1350 spin_lock_init(&dev->se_port_lock);
1351 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1352 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1353
1354 dev->queue_depth = dev_limits->queue_depth;
1355 atomic_set(&dev->depth_left, dev->queue_depth);
1356 atomic_set(&dev->dev_ordered_id, 0);
1357
1358 se_dev_set_default_attribs(dev, dev_limits);
1359
1360 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1361 dev->creation_time = get_jiffies_64();
1362 spin_lock_init(&dev->stats_lock);
1363
1364 spin_lock(&hba->device_lock);
1365 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1366 hba->dev_count++;
1367 spin_unlock(&hba->device_lock);
1368 /*
1369 * Setup the SAM Task Attribute emulation for struct se_device
1370 */
1371 core_setup_task_attr_emulation(dev);
1372 /*
1373 * Force PR and ALUA passthrough emulation with internal object use.
1374 */
1375 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1376 /*
1377 * Setup the Reservations infrastructure for struct se_device
1378 */
1379 core_setup_reservations(dev, force_pt);
1380 /*
1381 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1382 */
1383 if (core_setup_alua(dev, force_pt) < 0)
1384 goto out;
1385
1386 /*
1387 * Startup the struct se_device processing thread
1388 */
1389 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1390 "LIO_%s", dev->transport->name);
c66ac9db 1391 if (IS_ERR(dev->process_thread)) {
6708bb27 1392 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1393 dev->transport->name);
c66ac9db
NB		 1394 goto out;
1395 }
07bde79a
NB		 1396 /*
1397 * Setup work_queue for QUEUE_FULL
1398 */
1399 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1400 /*
1401 * Preload the initial INQUIRY const values if we are doing
1402 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1403 * passthrough because this is being provided by the backend LLD.
1404 * This is required so that transport_get_inquiry() copies these
1405 * originals once back into DEV_T10_WWN(dev) for the virtual device
1406 * setup.
1407 */
e3d6f909 1408 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1409 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1410 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1411 " INQUIRY consts\n");
1412 goto out;
1413 }
1414
e3d6f909
AG		 1415 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1416 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1417 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1418 }
1419 scsi_dump_inquiry(dev);
1420
12a18bdc 1421 return dev;
c66ac9db 1422out:
c66ac9db
NB		 1423 kthread_stop(dev->process_thread);
1424
1425 spin_lock(&hba->device_lock);
1426 list_del(&dev->dev_list);
1427 hba->dev_count--;
1428 spin_unlock(&hba->device_lock);
1429
1430 se_release_vpd_for_dev(dev);
1431
c66ac9db
NB		 1432 kfree(dev);
1433
1434 return NULL;
1435}
1436EXPORT_SYMBOL(transport_add_device_to_core_hba);
1437
1438/* transport_generic_prepare_cdb():
1439 *
1440 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1441 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1442 * The point of this is since we are mapping iSCSI LUNs to
1443 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1444 * devices and HBAs for a loop.
1445 */
1446static inline void transport_generic_prepare_cdb(
1447 unsigned char *cdb)
1448{
1449 switch (cdb[0]) {
1450 case READ_10: /* SBC - RDProtect */
1451 case READ_12: /* SBC - RDProtect */
1452 case READ_16: /* SBC - RDProtect */
1453 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1454 case VERIFY: /* SBC - VRProtect */
1455 case VERIFY_16: /* SBC - VRProtect */
1456 case WRITE_VERIFY: /* SBC - VRProtect */
1457 case WRITE_VERIFY_12: /* SBC - VRProtect */
1458 break;
1459 default:
1460 cdb[1] &= 0x1f; /* clear logical unit number */
1461 break;
1462 }
1463}
1464
1465static struct se_task *
1466transport_generic_get_task(struct se_cmd *cmd,
1467 enum dma_data_direction data_direction)
1468{
1469 struct se_task *task;
5951146d 1470 struct se_device *dev = cmd->se_dev;
c66ac9db 1471
6708bb27 1472 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1473 if (!task) {
6708bb27 1474 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1475 return NULL;
1476 }
1477
1478 INIT_LIST_HEAD(&task->t_list);
1479 INIT_LIST_HEAD(&task->t_execute_list);
1480 INIT_LIST_HEAD(&task->t_state_list);
1481 init_completion(&task->task_stop_comp);
c66ac9db 1482 task->task_se_cmd = cmd;
c66ac9db
NB		 1483 task->task_data_direction = data_direction;
1484
c66ac9db
NB		 1485 return task;
1486}
1487
1488static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1489
c66ac9db
NB		 1490/*
1491 * Used by fabric modules containing a local struct se_cmd within their
1492 * fabric dependent per I/O descriptor.
1493 */
1494void transport_init_se_cmd(
1495 struct se_cmd *cmd,
1496 struct target_core_fabric_ops *tfo,
1497 struct se_session *se_sess,
1498 u32 data_length,
1499 int data_direction,
1500 int task_attr,
1501 unsigned char *sense_buffer)
1502{
5951146d
AG		 1503 INIT_LIST_HEAD(&cmd->se_lun_node);
1504 INIT_LIST_HEAD(&cmd->se_delayed_node);
1505 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1506 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1507 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db 1508
a1d8b49a
AG		 1509 INIT_LIST_HEAD(&cmd->t_task_list);
1510 init_completion(&cmd->transport_lun_fe_stop_comp);
1511 init_completion(&cmd->transport_lun_stop_comp);
1512 init_completion(&cmd->t_transport_stop_comp);
1513 spin_lock_init(&cmd->t_state_lock);
1514 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1515
1516 cmd->se_tfo = tfo;
1517 cmd->se_sess = se_sess;
1518 cmd->data_length = data_length;
1519 cmd->data_direction = data_direction;
1520 cmd->sam_task_attr = task_attr;
1521 cmd->sense_buffer = sense_buffer;
1522}
1523EXPORT_SYMBOL(transport_init_se_cmd);
1524
1525static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1526{
1527 /*
1528 * Check if SAM Task Attribute emulation is enabled for this
1529 * struct se_device storage object
1530 */
5951146d 1531 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1532 return 0;
1533
e66ecd50 1534 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1535 pr_debug("SAM Task Attribute ACA"
c66ac9db 1536 " emulation is not supported\n");
e3d6f909 1537 return -EINVAL;
c66ac9db
NB		 1538 }
1539 /*
1540 * Used to determine when ORDERED commands should go from
1541 * Dormant to Active status.
1542 */
5951146d 1543 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1544 smp_mb__after_atomic_inc();
6708bb27 1545 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1546 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1547 cmd->se_dev->transport->name);
c66ac9db
NB		 1548 return 0;
1549}
1550
c66ac9db
NB		 1551/* transport_generic_allocate_tasks():
1552 *
1553 * Called from fabric RX Thread.
1554 */
1555int transport_generic_allocate_tasks(
1556 struct se_cmd *cmd,
1557 unsigned char *cdb)
1558{
1559 int ret;
1560
1561 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1562 /*
1563 * Ensure that the received CDB is less than the max (252 + 8) bytes
1564 * for VARIABLE_LENGTH_CMD
1565 */
1566 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1567 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1568 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1569 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1570 return -EINVAL;
c66ac9db
NB		 1571 }
1572 /*
1573 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1574 * allocate the additional extended CDB buffer now.. Otherwise
1575 * setup the pointer from __t_task_cdb to t_task_cdb.
1576 */
a1d8b49a
AG		 1577 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1578 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1579 GFP_KERNEL);
6708bb27
AG		 1580 if (!cmd->t_task_cdb) {
1581 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1582 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1583 scsi_command_size(cdb),
a1d8b49a 1584 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1585 return -ENOMEM;
c66ac9db
NB		 1586 }
1587 } else
a1d8b49a 1588 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1589 /*
a1d8b49a 1590 * Copy the original CDB into cmd->
c66ac9db 1591 */
a1d8b49a 1592 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1593 /*
1594 * Setup the received CDB based on SCSI defined opcodes and
1595 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1596 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1597 * pointer is expected to be setup before we reach this point.
1598 */
1599 ret = transport_generic_cmd_sequencer(cmd, cdb);
1600 if (ret < 0)
1601 return ret;
1602 /*
1603 * Check for SAM Task Attribute Emulation
1604 */
1605 if (transport_check_alloc_task_attr(cmd) < 0) {
1606 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1607 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1608 return -EINVAL;
c66ac9db
NB		 1609 }
1610 spin_lock(&cmd->se_lun->lun_sep_lock);
1611 if (cmd->se_lun->lun_sep)
1612 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1613 spin_unlock(&cmd->se_lun->lun_sep_lock);
1614 return 0;
1615}
1616EXPORT_SYMBOL(transport_generic_allocate_tasks);
1617
695434e1
NB		 1618/*
1619 * Used by fabric module frontends to queue tasks directly.
1620 * Many only be used from process context only
1621 */
1622int transport_handle_cdb_direct(
1623 struct se_cmd *cmd)
1624{
dd8ae59d
NB		 1625 int ret;
1626
695434e1
NB		 1627 if (!cmd->se_lun) {
1628 dump_stack();
6708bb27 1629 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1630 return -EINVAL;
1631 }
1632 if (in_interrupt()) {
1633 dump_stack();
6708bb27 1634 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1635 " from interrupt context\n");
1636 return -EINVAL;
1637 }
dd8ae59d
NB		 1638 /*
1639 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1640 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1641 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1642 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1643 *
1644 * Also, we don't take cmd->t_state_lock here as we only expect
1645 * this to be called for initial descriptor submission.
1646 */
1647 cmd->t_state = TRANSPORT_NEW_CMD;
1648 atomic_set(&cmd->t_transport_active, 1);
1649 /*
1650 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1651 * so follow TRANSPORT_NEW_CMD processing thread context usage
1652 * and call transport_generic_request_failure() if necessary..
1653 */
1654 ret = transport_generic_new_cmd(cmd);
f147abb4 1655 if (ret < 0) {
dd8ae59d 1656 cmd->transport_error_status = ret;
4499dda8 1657 transport_generic_request_failure(cmd, 0,
dd8ae59d
NB		 1658 (cmd->data_direction != DMA_TO_DEVICE));
1659 }
1660 return 0;
695434e1
NB		 1661}
1662EXPORT_SYMBOL(transport_handle_cdb_direct);
1663
c66ac9db
NB		 1664/*
1665 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1666 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1667 * complete setup in TCM process context w/ TFO->new_cmd_map().
1668 */
1669int transport_generic_handle_cdb_map(
1670 struct se_cmd *cmd)
1671{
e3d6f909 1672 if (!cmd->se_lun) {
c66ac9db 1673 dump_stack();
6708bb27 1674 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1675 return -EINVAL;
c66ac9db
NB		 1676 }
1677
f7a5cc0b 1678 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1679 return 0;
1680}
1681EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1682
1683/* transport_generic_handle_data():
1684 *
1685 *
1686 */
1687int transport_generic_handle_data(
1688 struct se_cmd *cmd)
1689{
1690 /*
1691 * For the software fabric case, then we assume the nexus is being
1692 * failed/shutdown when signals are pending from the kthread context
1693 * caller, so we return a failure. For the HW target mode case running
1694 * in interrupt code, the signal_pending() check is skipped.
1695 */
1696 if (!in_interrupt() && signal_pending(current))
e3d6f909 1697 return -EPERM;
c66ac9db
NB		 1698 /*
1699 * If the received CDB has aleady been ABORTED by the generic
1700 * target engine, we now call transport_check_aborted_status()
1701 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1702 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1703 * sequences at this point.
1704 */
1705 if (transport_check_aborted_status(cmd, 1) != 0)
1706 return 0;
1707
f7a5cc0b 1708 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1709 return 0;
1710}
1711EXPORT_SYMBOL(transport_generic_handle_data);
1712
1713/* transport_generic_handle_tmr():
1714 *
1715 *
1716 */
1717int transport_generic_handle_tmr(
1718 struct se_cmd *cmd)
1719{
f7a5cc0b 1720 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1721 return 0;
1722}
1723EXPORT_SYMBOL(transport_generic_handle_tmr);
1724
cdbb70bb
CH		 1725/*
1726 * If the task is active, request it to be stopped and sleep until it
1727 * has completed.
1728 */
1729bool target_stop_task(struct se_task *task, unsigned long *flags)
1730{
1731 struct se_cmd *cmd = task->task_se_cmd;
1732 bool was_active = false;
1733
1734 if (task->task_flags & TF_ACTIVE) {
1735 task->task_flags |= TF_REQUEST_STOP;
1736 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1737
1738 pr_debug("Task %p waiting to complete\n", task);
1739 wait_for_completion(&task->task_stop_comp);
1740 pr_debug("Task %p stopped successfully\n", task);
1741
1742 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1743 atomic_dec(&cmd->t_task_cdbs_left);
1744 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1745 was_active = true;
1746 }
1747
cdbb70bb
CH		 1748 return was_active;
1749}
1750
c66ac9db
NB		 1751static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1752{
1753 struct se_task *task, *task_tmp;
1754 unsigned long flags;
1755 int ret = 0;
1756
6708bb27 1757 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1758 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1759
1760 /*
1761 * No tasks remain in the execution queue
1762 */
a1d8b49a 1763 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1764 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1765 &cmd->t_task_list, t_list) {
04629b7b 1766 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1767 /*
1768 * If the struct se_task has not been sent and is not active,
1769 * remove the struct se_task from the execution queue.
1770 */
6c76bf95 1771 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1772 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1773 flags);
1774 transport_remove_task_from_execute_queue(task,
42bf829e 1775 cmd->se_dev);
c66ac9db 1776
04629b7b 1777 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1778 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1779 continue;
1780 }
1781
cdbb70bb 1782 if (!target_stop_task(task, &flags)) {
04629b7b 1783 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1784 ret++;
1785 }
c66ac9db 1786 }
a1d8b49a 1787 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1788
1789 return ret;
1790}
1791
c66ac9db
NB		 1792/*
1793 * Handle SAM-esque emulation for generic transport request failures.
1794 */
1795static void transport_generic_request_failure(
1796 struct se_cmd *cmd,
c66ac9db
NB		 1797 int complete,
1798 int sc)
1799{
07bde79a
NB		 1800 int ret = 0;
1801
6708bb27 1802 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1803 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1804 cmd->t_task_cdb[0]);
f2da9dbd 1805 pr_debug("-----[ i_state: %d t_state: %d transport_error_status: %d\n",
e3d6f909 1806 cmd->se_tfo->get_cmd_state(cmd),
f2da9dbd 1807 cmd->t_state,
c66ac9db 1808 cmd->transport_error_status);
6708bb27 1809 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1810 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1811 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1812 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1813 atomic_read(&cmd->t_task_cdbs_left),
1814 atomic_read(&cmd->t_task_cdbs_sent),
1815 atomic_read(&cmd->t_task_cdbs_ex_left),
1816 atomic_read(&cmd->t_transport_active),
1817 atomic_read(&cmd->t_transport_stop),
1818 atomic_read(&cmd->t_transport_sent));
c66ac9db 1819
c66ac9db
NB		 1820 /*
1821 * For SAM Task Attribute emulation for failed struct se_cmd
1822 */
1823 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1824 transport_complete_task_attr(cmd);
1825
1826 if (complete) {
c66ac9db
NB		 1827 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1828 }
1829
1830 switch (cmd->transport_error_status) {
1831 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1832 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1833 break;
1834 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1835 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1836 break;
1837 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1838 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1839 break;
1840 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1841 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1842 break;
1843 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1844 if (!sc)
1845 transport_new_cmd_failure(cmd);
1846 /*
1847 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1848 * we force this session to fall back to session
1849 * recovery.
1850 */
e3d6f909
AG		 1851 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1852 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 1853
1854 goto check_stop;
1855 case PYX_TRANSPORT_LU_COMM_FAILURE:
1856 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1857 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1858 break;
1859 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1860 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1861 break;
1862 case PYX_TRANSPORT_WRITE_PROTECTED:
1863 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1864 break;
1865 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1866 /*
1867 * No SENSE Data payload for this case, set SCSI Status
1868 * and queue the response to $FABRIC_MOD.
1869 *
1870 * Uses linux/include/scsi/scsi.h SAM status codes defs
1871 */
1872 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1873 /*
1874 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1875 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1876 * CONFLICT STATUS.
1877 *
1878 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1879 */
e3d6f909
AG		 1880 if (cmd->se_sess &&
1881 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1882 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1883 cmd->orig_fe_lun, 0x2C,
1884 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1885
07bde79a 1886 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1887 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1888 goto queue_full;
c66ac9db
NB		 1889 goto check_stop;
1890 case PYX_TRANSPORT_USE_SENSE_REASON:
1891 /*
1892 * struct se_cmd->scsi_sense_reason already set
1893 */
1894 break;
1895 default:
6708bb27 1896 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 1897 cmd->t_task_cdb[0],
c66ac9db
NB		 1898 cmd->transport_error_status);
1899 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1900 break;
1901 }
16ab8e60
NB		 1902 /*
1903 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1904 * make the call to transport_send_check_condition_and_sense()
1905 * directly. Otherwise expect the fabric to make the call to
1906 * transport_send_check_condition_and_sense() after handling
1907 * possible unsoliticied write data payloads.
1908 */
1909 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 1910 transport_new_cmd_failure(cmd);
07bde79a
NB		 1911 else {
1912 ret = transport_send_check_condition_and_sense(cmd,
1913 cmd->scsi_sense_reason, 0);
f147abb4 1914 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 1915 goto queue_full;
1916 }
1917
c66ac9db
NB		 1918check_stop:
1919 transport_lun_remove_cmd(cmd);
6708bb27 1920 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1921 ;
07bde79a
NB		 1922 return;
1923
1924queue_full:
e057f533
CH		 1925 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1926 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1927}
1928
c66ac9db
NB		 1929static inline u32 transport_lba_21(unsigned char *cdb)
1930{
1931 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1932}
1933
1934static inline u32 transport_lba_32(unsigned char *cdb)
1935{
1936 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1937}
1938
1939static inline unsigned long long transport_lba_64(unsigned char *cdb)
1940{
1941 unsigned int __v1, __v2;
1942
1943 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1944 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1945
1946 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1947}
1948
1949/*
1950 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1951 */
1952static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1953{
1954 unsigned int __v1, __v2;
1955
1956 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1957 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1958
1959 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1960}
1961
1962static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1963{
1964 unsigned long flags;
1965
a1d8b49a 1966 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 1967 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 1968 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 1969}
1970
c66ac9db
NB		 1971static inline int transport_tcq_window_closed(struct se_device *dev)
1972{
1973 if (dev->dev_tcq_window_closed++ <
1974 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1975 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1976 } else
1977 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1978
e3d6f909 1979 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 1980 return 0;
1981}
1982
1983/*
1984 * Called from Fabric Module context from transport_execute_tasks()
1985 *
1986 * The return of this function determins if the tasks from struct se_cmd
1987 * get added to the execution queue in transport_execute_tasks(),
1988 * or are added to the delayed or ordered lists here.
1989 */
1990static inline int transport_execute_task_attr(struct se_cmd *cmd)
1991{
5951146d 1992 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1993 return 1;
1994 /*
25985edc 1995 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1996 * to allow the passed struct se_cmd list of tasks to the front of the list.
1997 */
e66ecd50 1998 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 1999 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2000 smp_mb__after_atomic_inc();
6708bb27 2001 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2002 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2003 cmd->t_task_cdb[0],
c66ac9db
NB		 2004 cmd->se_ordered_id);
2005 return 1;
e66ecd50 2006 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2007 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2008 list_add_tail(&cmd->se_ordered_node,
2009 &cmd->se_dev->ordered_cmd_list);
2010 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2011
5951146d 2012 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2013 smp_mb__after_atomic_inc();
2014
6708bb27 2015 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2016 " list, se_ordered_id: %u\n",
a1d8b49a 2017 cmd->t_task_cdb[0],
c66ac9db
NB		 2018 cmd->se_ordered_id);
2019 /*
2020 * Add ORDERED command to tail of execution queue if
2021 * no other older commands exist that need to be
2022 * completed first.
2023 */
6708bb27 2024 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2025 return 1;
2026 } else {
2027 /*
2028 * For SIMPLE and UNTAGGED Task Attribute commands
2029 */
5951146d 2030 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2031 smp_mb__after_atomic_inc();
2032 }
2033 /*
2034 * Otherwise if one or more outstanding ORDERED task attribute exist,
2035 * add the dormant task(s) built for the passed struct se_cmd to the
2036 * execution queue and become in Active state for this struct se_device.
2037 */
5951146d 2038 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2039 /*
2040 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2041 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2042 */
5951146d 2043 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2044 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2045 list_add_tail(&cmd->se_delayed_node,
2046 &cmd->se_dev->delayed_cmd_list);
2047 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2048
6708bb27 2049 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2050 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2051 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2052 cmd->se_ordered_id);
2053 /*
2054 * Return zero to let transport_execute_tasks() know
2055 * not to add the delayed tasks to the execution list.
2056 */
2057 return 0;
2058 }
2059 /*
2060 * Otherwise, no ORDERED task attributes exist..
2061 */
2062 return 1;
2063}
2064
2065/*
2066 * Called from fabric module context in transport_generic_new_cmd() and
2067 * transport_generic_process_write()
2068 */
2069static int transport_execute_tasks(struct se_cmd *cmd)
2070{
2071 int add_tasks;
2072
db1620a2
CH		 2073 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2074 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
4499dda8 2075 transport_generic_request_failure(cmd, 0, 1);
db1620a2 2076 return 0;
c66ac9db 2077 }
db1620a2 2078
c66ac9db
NB		 2079 /*
2080 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2081 * has occurred that prevents execution.
c66ac9db 2082 */
6708bb27 2083 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2084 /*
2085 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2086 * attribute for the tasks of the received struct se_cmd CDB
2087 */
2088 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2089 if (!add_tasks)
c66ac9db
NB		 2090 goto execute_tasks;
2091 /*
2092 * This calls transport_add_tasks_from_cmd() to handle
2093 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2094 * (if enabled) in __transport_add_task_to_execute_queue() and
2095 * transport_add_task_check_sam_attr().
2096 */
2097 transport_add_tasks_from_cmd(cmd);
2098 }
2099 /*
2100 * Kick the execution queue for the cmd associated struct se_device
2101 * storage object.
2102 */
2103execute_tasks:
5951146d 2104 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2105 return 0;
2106}
2107
2108/*
2109 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2110 * from struct se_device->execute_task_list and
2111 *
2112 * Called from transport_processing_thread()
2113 */
2114static int __transport_execute_tasks(struct se_device *dev)
2115{
2116 int error;
2117 struct se_cmd *cmd = NULL;
e3d6f909 2118 struct se_task *task = NULL;
c66ac9db
NB		 2119 unsigned long flags;
2120
2121 /*
2122 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2123 * struct se_tasks to the selected transport.
c66ac9db
NB		 2124 */
2125check_depth:
e3d6f909 2126 if (!atomic_read(&dev->depth_left))
c66ac9db 2127 return transport_tcq_window_closed(dev);
c66ac9db 2128
e3d6f909 2129 dev->dev_tcq_window_closed = 0;
c66ac9db 2130
e3d6f909
AG		 2131 spin_lock_irq(&dev->execute_task_lock);
2132 if (list_empty(&dev->execute_task_list)) {
2133 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2134 return 0;
2135 }
e3d6f909
AG		 2136 task = list_first_entry(&dev->execute_task_list,
2137 struct se_task, t_execute_list);
04629b7b 2138 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2139 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2140
2141 atomic_dec(&dev->depth_left);
c66ac9db 2142
e3d6f909 2143 cmd = task->task_se_cmd;
c66ac9db 2144
a1d8b49a 2145 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2146 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2147 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2148
a1d8b49a
AG		 2149 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2150 cmd->t_task_list_num)
415a090a 2151 atomic_set(&cmd->t_transport_sent, 1);
c66ac9db 2152
a1d8b49a 2153 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2154 /*
2155 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2156 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2157 * struct se_subsystem_api->do_task() caller below.
2158 */
2159 if (cmd->transport_emulate_cdb) {
2160 error = cmd->transport_emulate_cdb(cmd);
2161 if (error != 0) {
2162 cmd->transport_error_status = error;
6c76bf95
CH		 2163 spin_lock_irqsave(&cmd->t_state_lock, flags);
2164 task->task_flags &= ~TF_ACTIVE;
2165 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
415a090a 2166 atomic_set(&cmd->t_transport_sent, 0);
c66ac9db 2167 transport_stop_tasks_for_cmd(cmd);
4499dda8
CH		 2168 atomic_inc(&dev->depth_left);
2169 transport_generic_request_failure(cmd, 0, 1);
c66ac9db
NB		 2170 goto check_depth;
2171 }
2172 /*
2173 * Handle the successful completion for transport_emulate_cdb()
2174 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2175 * Otherwise the caller is expected to complete the task with
2176 * proper status.
2177 */
2178 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2179 cmd->scsi_status = SAM_STAT_GOOD;
2180 task->task_scsi_status = GOOD;
2181 transport_complete_task(task, 1);
2182 }
2183 } else {
2184 /*
2185 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2186 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2187 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2188 * LUN emulation code.
2189 *
2190 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2191 * call ->do_task() directly and let the underlying TCM subsystem plugin
2192 * code handle the CDB emulation.
2193 */
e3d6f909
AG		 2194 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2195 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2196 error = transport_emulate_control_cdb(task);
2197 else
e3d6f909 2198 error = dev->transport->do_task(task);
c66ac9db
NB		 2199
2200 if (error != 0) {
2201 cmd->transport_error_status = error;
6c76bf95
CH		 2202 spin_lock_irqsave(&cmd->t_state_lock, flags);
2203 task->task_flags &= ~TF_ACTIVE;
2204 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
415a090a 2205 atomic_set(&cmd->t_transport_sent, 0);
c66ac9db 2206 transport_stop_tasks_for_cmd(cmd);
4499dda8
CH		 2207 atomic_inc(&dev->depth_left);
2208 transport_generic_request_failure(cmd, 0, 1);
c66ac9db
NB		 2209 }
2210 }
2211
2212 goto check_depth;
2213
2214 return 0;
2215}
2216
2217void transport_new_cmd_failure(struct se_cmd *se_cmd)
2218{
2219 unsigned long flags;
2220 /*
2221 * Any unsolicited data will get dumped for failed command inside of
2222 * the fabric plugin
2223 */
a1d8b49a 2224 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2225 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2226 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2227 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2228}
2229
c66ac9db
NB		 2230static inline u32 transport_get_sectors_6(
2231 unsigned char *cdb,
2232 struct se_cmd *cmd,
2233 int *ret)
2234{
5951146d 2235 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2236
2237 /*
2238 * Assume TYPE_DISK for non struct se_device objects.
2239 * Use 8-bit sector value.
2240 */
2241 if (!dev)
2242 goto type_disk;
2243
2244 /*
2245 * Use 24-bit allocation length for TYPE_TAPE.
2246 */
e3d6f909 2247 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2248 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2249
2250 /*
2251 * Everything else assume TYPE_DISK Sector CDB location.
2252 * Use 8-bit sector value.
2253 */
2254type_disk:
2255 return (u32)cdb[4];
2256}
2257
2258static inline u32 transport_get_sectors_10(
2259 unsigned char *cdb,
2260 struct se_cmd *cmd,
2261 int *ret)
2262{
5951146d 2263 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2264
2265 /*
2266 * Assume TYPE_DISK for non struct se_device objects.
2267 * Use 16-bit sector value.
2268 */
2269 if (!dev)
2270 goto type_disk;
2271
2272 /*
2273 * XXX_10 is not defined in SSC, throw an exception
2274 */
e3d6f909
AG		 2275 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2276 *ret = -EINVAL;
c66ac9db
NB		 2277 return 0;
2278 }
2279
2280 /*
2281 * Everything else assume TYPE_DISK Sector CDB location.
2282 * Use 16-bit sector value.
2283 */
2284type_disk:
2285 return (u32)(cdb[7] << 8) + cdb[8];
2286}
2287
2288static inline u32 transport_get_sectors_12(
2289 unsigned char *cdb,
2290 struct se_cmd *cmd,
2291 int *ret)
2292{
5951146d 2293 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2294
2295 /*
2296 * Assume TYPE_DISK for non struct se_device objects.
2297 * Use 32-bit sector value.
2298 */
2299 if (!dev)
2300 goto type_disk;
2301
2302 /*
2303 * XXX_12 is not defined in SSC, throw an exception
2304 */
e3d6f909
AG		 2305 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2306 *ret = -EINVAL;
c66ac9db
NB		 2307 return 0;
2308 }
2309
2310 /*
2311 * Everything else assume TYPE_DISK Sector CDB location.
2312 * Use 32-bit sector value.
2313 */
2314type_disk:
2315 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2316}
2317
2318static inline u32 transport_get_sectors_16(
2319 unsigned char *cdb,
2320 struct se_cmd *cmd,
2321 int *ret)
2322{
5951146d 2323 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2324
2325 /*
2326 * Assume TYPE_DISK for non struct se_device objects.
2327 * Use 32-bit sector value.
2328 */
2329 if (!dev)
2330 goto type_disk;
2331
2332 /*
2333 * Use 24-bit allocation length for TYPE_TAPE.
2334 */
e3d6f909 2335 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2336 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2337
2338type_disk:
2339 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2340 (cdb[12] << 8) + cdb[13];
2341}
2342
2343/*
2344 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2345 */
2346static inline u32 transport_get_sectors_32(
2347 unsigned char *cdb,
2348 struct se_cmd *cmd,
2349 int *ret)
2350{
2351 /*
2352 * Assume TYPE_DISK for non struct se_device objects.
2353 * Use 32-bit sector value.
2354 */
2355 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2356 (cdb[30] << 8) + cdb[31];
2357
2358}
2359
2360static inline u32 transport_get_size(
2361 u32 sectors,
2362 unsigned char *cdb,
2363 struct se_cmd *cmd)
2364{
5951146d 2365 struct se_device *dev = cmd->se_dev;
c66ac9db 2366
e3d6f909 2367 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2368 if (cdb[1] & 1) { /* sectors */
e3d6f909 2369 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2370 } else /* bytes */
2371 return sectors;
2372 }
2373#if 0
6708bb27 2374 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2375 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2376 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2377 dev->transport->name);
c66ac9db 2378#endif
e3d6f909 2379 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2380}
2381
c66ac9db
NB		 2382static void transport_xor_callback(struct se_cmd *cmd)
2383{
2384 unsigned char *buf, *addr;
ec98f782 2385 struct scatterlist *sg;
c66ac9db
NB		 2386 unsigned int offset;
2387 int i;
ec98f782 2388 int count;
c66ac9db
NB		 2389 /*
2390 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2391 *
2392 * 1) read the specified logical block(s);
2393 * 2) transfer logical blocks from the data-out buffer;
2394 * 3) XOR the logical blocks transferred from the data-out buffer with
2395 * the logical blocks read, storing the resulting XOR data in a buffer;
2396 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2397 * blocks transferred from the data-out buffer; and
2398 * 5) transfer the resulting XOR data to the data-in buffer.
2399 */
2400 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2401 if (!buf) {
2402 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2403 return;
2404 }
2405 /*
ec98f782 2406 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2407 * into the locally allocated *buf
2408 */
ec98f782
AG		 2409 sg_copy_to_buffer(cmd->t_data_sg,
2410 cmd->t_data_nents,
2411 buf,
2412 cmd->data_length);
2413
c66ac9db
NB		 2414 /*
2415 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2416 * cmd->t_mem_bidi_list
c66ac9db
NB		 2417 */
2418
2419 offset = 0;
ec98f782
AG		 2420 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2421 addr = kmap_atomic(sg_page(sg), KM_USER0);
2422 if (!addr)
c66ac9db
NB		 2423 goto out;
2424
ec98f782
AG		 2425 for (i = 0; i < sg->length; i++)
2426 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2427
ec98f782 2428 offset += sg->length;
c66ac9db
NB		 2429 kunmap_atomic(addr, KM_USER0);
2430 }
ec98f782 2431
c66ac9db
NB		 2432out:
2433 kfree(buf);
2434}
2435
2436/*
2437 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2438 */
2439static int transport_get_sense_data(struct se_cmd *cmd)
2440{
2441 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2442 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2443 struct se_task *task = NULL, *task_tmp;
2444 unsigned long flags;
2445 u32 offset = 0;
2446
e3d6f909
AG		 2447 WARN_ON(!cmd->se_lun);
2448
42bf829e
CH		 2449 if (!dev)
2450 return 0;
2451
a1d8b49a 2452 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2453 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2454 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2455 return 0;
2456 }
2457
2458 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2459 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2460 if (!task->task_sense)
2461 continue;
2462
e3d6f909 2463 if (!dev->transport->get_sense_buffer) {
6708bb27 2464 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2465 " is NULL\n");
2466 continue;
2467 }
2468
e3d6f909 2469 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2470 if (!sense_buffer) {
04629b7b 2471 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2472 " sense buffer for task with sense\n",
04629b7b 2473 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2474 continue;
2475 }
a1d8b49a 2476 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2477
e3d6f909 2478 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2479 TRANSPORT_SENSE_BUFFER);
2480
5951146d 2481 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2482 TRANSPORT_SENSE_BUFFER);
2483 cmd->scsi_status = task->task_scsi_status;
2484 /* Automatically padded */
2485 cmd->scsi_sense_length =
2486 (TRANSPORT_SENSE_BUFFER + offset);
2487
6708bb27 2488 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2489 " and sense\n",
e3d6f909 2490 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2491 cmd->scsi_status);
2492 return 0;
2493 }
a1d8b49a 2494 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2495
2496 return -1;
2497}
2498
c66ac9db
NB		 2499static int
2500transport_handle_reservation_conflict(struct se_cmd *cmd)
2501{
c66ac9db
NB		 2502 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2503 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2504 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2505 /*
2506 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2507 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2508 * CONFLICT STATUS.
2509 *
2510 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2511 */
e3d6f909
AG		 2512 if (cmd->se_sess &&
2513 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2514 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2515 cmd->orig_fe_lun, 0x2C,
2516 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2517 return -EINVAL;
c66ac9db
NB		 2518}
2519
ec98f782
AG		 2520static inline long long transport_dev_end_lba(struct se_device *dev)
2521{
2522 return dev->transport->get_blocks(dev) + 1;
2523}
2524
2525static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2526{
2527 struct se_device *dev = cmd->se_dev;
2528 u32 sectors;
2529
2530 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2531 return 0;
2532
2533 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2534
6708bb27
AG		 2535 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2536 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2537 " transport_dev_end_lba(): %llu\n",
2538 cmd->t_task_lba, sectors,
2539 transport_dev_end_lba(dev));
7abbe7f3 2540 return -EINVAL;
ec98f782
AG		 2541 }
2542
7abbe7f3 2543 return 0;
ec98f782
AG		 2544}
2545
706d5860
NB		 2546static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2547{
2548 /*
2549 * Determine if the received WRITE_SAME is used to for direct
2550 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2551 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2552 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2553 */
2554 int passthrough = (dev->transport->transport_type ==
2555 TRANSPORT_PLUGIN_PHBA_PDEV);
2556
2557 if (!passthrough) {
2558 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2559 pr_err("WRITE_SAME PBDATA and LBDATA"
2560 " bits not supported for Block Discard"
2561 " Emulation\n");
2562 return -ENOSYS;
2563 }
2564 /*
2565 * Currently for the emulated case we only accept
2566 * tpws with the UNMAP=1 bit set.
2567 */
2568 if (!(flags[0] & 0x08)) {
2569 pr_err("WRITE_SAME w/o UNMAP bit not"
2570 " supported for Block Discard Emulation\n");
2571 return -ENOSYS;
2572 }
2573 }
2574
2575 return 0;
2576}
2577
c66ac9db
NB		 2578/* transport_generic_cmd_sequencer():
2579 *
2580 * Generic Command Sequencer that should work for most DAS transport
2581 * drivers.
2582 *
2583 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2584 * RX Thread.
2585 *
2586 * FIXME: Need to support other SCSI OPCODES where as well.
2587 */
2588static int transport_generic_cmd_sequencer(
2589 struct se_cmd *cmd,
2590 unsigned char *cdb)
2591{
5951146d 2592 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2593 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2594 int ret = 0, sector_ret = 0, passthrough;
2595 u32 sectors = 0, size = 0, pr_reg_type = 0;
2596 u16 service_action;
2597 u8 alua_ascq = 0;
2598 /*
2599 * Check for an existing UNIT ATTENTION condition
2600 */
2601 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2602 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2603 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2604 return -EINVAL;
c66ac9db
NB		 2605 }
2606 /*
2607 * Check status of Asymmetric Logical Unit Assignment port
2608 */
e3d6f909 2609 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2610 if (ret != 0) {
c66ac9db 2611 /*
25985edc 2612 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2613 * The ALUA additional sense code qualifier (ASCQ) is determined
2614 * by the ALUA primary or secondary access state..
2615 */
2616 if (ret > 0) {
2617#if 0
6708bb27 2618 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2619 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2620 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2621#endif
2622 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2623 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2624 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2625 return -EINVAL;
c66ac9db
NB		 2626 }
2627 goto out_invalid_cdb_field;
2628 }
2629 /*
2630 * Check status for SPC-3 Persistent Reservations
2631 */
e3d6f909
AG		 2632 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2633 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2634 cmd, cdb, pr_reg_type) != 0)
2635 return transport_handle_reservation_conflict(cmd);
2636 /*
2637 * This means the CDB is allowed for the SCSI Initiator port
2638 * when said port is *NOT* holding the legacy SPC-2 or
2639 * SPC-3 Persistent Reservation.
2640 */
2641 }
2642
2643 switch (cdb[0]) {
2644 case READ_6:
2645 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2646 if (sector_ret)
2647 goto out_unsupported_cdb;
2648 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2649 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2650 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2651 break;
2652 case READ_10:
2653 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2654 if (sector_ret)
2655 goto out_unsupported_cdb;
2656 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2657 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2658 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2659 break;
2660 case READ_12:
2661 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2662 if (sector_ret)
2663 goto out_unsupported_cdb;
2664 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2665 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2666 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2667 break;
2668 case READ_16:
2669 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2670 if (sector_ret)
2671 goto out_unsupported_cdb;
2672 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2673 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2674 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2675 break;
2676 case WRITE_6:
2677 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2678 if (sector_ret)
2679 goto out_unsupported_cdb;
2680 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2681 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2682 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2683 break;
2684 case WRITE_10:
2685 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2686 if (sector_ret)
2687 goto out_unsupported_cdb;
2688 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2689 cmd->t_task_lba = transport_lba_32(cdb);
2690 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2691 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2692 break;
2693 case WRITE_12:
2694 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2695 if (sector_ret)
2696 goto out_unsupported_cdb;
2697 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2698 cmd->t_task_lba = transport_lba_32(cdb);
2699 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2700 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2701 break;
2702 case WRITE_16:
2703 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2704 if (sector_ret)
2705 goto out_unsupported_cdb;
2706 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2707 cmd->t_task_lba = transport_lba_64(cdb);
2708 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2709 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2710 break;
2711 case XDWRITEREAD_10:
2712 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 2713 !(cmd->t_tasks_bidi))
c66ac9db
NB		 2714 goto out_invalid_cdb_field;
2715 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2716 if (sector_ret)
2717 goto out_unsupported_cdb;
2718 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2719 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2720 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3
CH		 2721
2722 if (dev->transport->transport_type ==
2723 TRANSPORT_PLUGIN_PHBA_PDEV)
2724 goto out_unsupported_cdb;
c66ac9db 2725 /*
35e0e757 2726 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2727 */
2728 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2729 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2730 break;
2731 case VARIABLE_LENGTH_CMD:
2732 service_action = get_unaligned_be16(&cdb[8]);
2733 /*
2734 * Determine if this is TCM/PSCSI device and we should disable
2735 * internal emulation for this CDB.
2736 */
e3d6f909 2737 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2738 TRANSPORT_PLUGIN_PHBA_PDEV);
2739
2740 switch (service_action) {
2741 case XDWRITEREAD_32:
2742 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2743 if (sector_ret)
2744 goto out_unsupported_cdb;
2745 size = transport_get_size(sectors, cdb, cmd);
2746 /*
2747 * Use WRITE_32 and READ_32 opcodes for the emulated
2748 * XDWRITE_READ_32 logic.
2749 */
a1d8b49a 2750 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2751 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2752
c66ac9db 2753 if (passthrough)
7c1c6af3 2754 goto out_unsupported_cdb;
c66ac9db 2755 /*
35e0e757
CH		 2756 * Setup BIDI XOR callback to be run during after I/O
2757 * completion.
c66ac9db
NB		 2758 */
2759 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2760 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 2761 break;
2762 case WRITE_SAME_32:
2763 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2764 if (sector_ret)
2765 goto out_unsupported_cdb;
dd3a5ad8 2766
6708bb27 2767 if (sectors)
12850626 2768 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2769 else {
2770 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2771 " supported\n");
2772 goto out_invalid_cdb_field;
2773 }
dd3a5ad8 2774
a1d8b49a 2775 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2776 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2777
706d5860 2778 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2779 goto out_invalid_cdb_field;
706d5860 2780
c66ac9db
NB		 2781 break;
2782 default:
6708bb27 2783 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2784 " 0x%04x not supported\n", service_action);
2785 goto out_unsupported_cdb;
2786 }
2787 break;
e434f1f1 2788 case MAINTENANCE_IN:
e3d6f909 2789 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2790 /* MAINTENANCE_IN from SCC-2 */
2791 /*
2792 * Check for emulated MI_REPORT_TARGET_PGS.
2793 */
2794 if (cdb[1] == MI_REPORT_TARGET_PGS) {
2795 cmd->transport_emulate_cdb =
e3d6f909 2796 (su_dev->t10_alua.alua_type ==
c66ac9db 2797 SPC3_ALUA_EMULATED) ?
e3d6f909 2798 core_emulate_report_target_port_groups :
c66ac9db
NB		 2799 NULL;
2800 }
2801 size = (cdb[6] << 24) | (cdb[7] << 16) |
2802 (cdb[8] << 8) | cdb[9];
2803 } else {
2804 /* GPCMD_SEND_KEY from multi media commands */
2805 size = (cdb[8] << 8) + cdb[9];
2806 }
05d1c7c0 2807 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2808 break;
2809 case MODE_SELECT:
2810 size = cdb[4];
2811 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2812 break;
2813 case MODE_SELECT_10:
2814 size = (cdb[7] << 8) + cdb[8];
2815 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2816 break;
2817 case MODE_SENSE:
2818 size = cdb[4];
05d1c7c0 2819 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2820 break;
2821 case MODE_SENSE_10:
2822 case GPCMD_READ_BUFFER_CAPACITY:
2823 case GPCMD_SEND_OPC:
2824 case LOG_SELECT:
2825 case LOG_SENSE:
2826 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2827 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2828 break;
2829 case READ_BLOCK_LIMITS:
2830 size = READ_BLOCK_LEN;
05d1c7c0 2831 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2832 break;
2833 case GPCMD_GET_CONFIGURATION:
2834 case GPCMD_READ_FORMAT_CAPACITIES:
2835 case GPCMD_READ_DISC_INFO:
2836 case GPCMD_READ_TRACK_RZONE_INFO:
2837 size = (cdb[7] << 8) + cdb[8];
2838 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2839 break;
2840 case PERSISTENT_RESERVE_IN:
2841 case PERSISTENT_RESERVE_OUT:
2842 cmd->transport_emulate_cdb =
e3d6f909 2843 (su_dev->t10_pr.res_type ==
c66ac9db 2844 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 2845 core_scsi3_emulate_pr : NULL;
c66ac9db 2846 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2847 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2848 break;
2849 case GPCMD_MECHANISM_STATUS:
2850 case GPCMD_READ_DVD_STRUCTURE:
2851 size = (cdb[8] << 8) + cdb[9];
2852 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2853 break;
2854 case READ_POSITION:
2855 size = READ_POSITION_LEN;
05d1c7c0 2856 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2857 break;
e434f1f1 2858 case MAINTENANCE_OUT:
e3d6f909 2859 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2860 /* MAINTENANCE_OUT from SCC-2
2861 *
2862 * Check for emulated MO_SET_TARGET_PGS.
2863 */
2864 if (cdb[1] == MO_SET_TARGET_PGS) {
2865 cmd->transport_emulate_cdb =
e3d6f909 2866 (su_dev->t10_alua.alua_type ==
c66ac9db 2867 SPC3_ALUA_EMULATED) ?
e3d6f909 2868 core_emulate_set_target_port_groups :
c66ac9db
NB		 2869 NULL;
2870 }
2871
2872 size = (cdb[6] << 24) | (cdb[7] << 16) |
2873 (cdb[8] << 8) | cdb[9];
2874 } else {
2875 /* GPCMD_REPORT_KEY from multi media commands */
2876 size = (cdb[8] << 8) + cdb[9];
2877 }
05d1c7c0 2878 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2879 break;
2880 case INQUIRY:
2881 size = (cdb[3] << 8) + cdb[4];
2882 /*
2883 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2884 * See spc4r17 section 5.3
2885 */
5951146d 2886 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2887 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2888 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2889 break;
2890 case READ_BUFFER:
2891 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2892 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2893 break;
2894 case READ_CAPACITY:
2895 size = READ_CAP_LEN;
05d1c7c0 2896 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2897 break;
2898 case READ_MEDIA_SERIAL_NUMBER:
2899 case SECURITY_PROTOCOL_IN:
2900 case SECURITY_PROTOCOL_OUT:
2901 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2902 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2903 break;
2904 case SERVICE_ACTION_IN:
2905 case ACCESS_CONTROL_IN:
2906 case ACCESS_CONTROL_OUT:
2907 case EXTENDED_COPY:
2908 case READ_ATTRIBUTE:
2909 case RECEIVE_COPY_RESULTS:
2910 case WRITE_ATTRIBUTE:
2911 size = (cdb[10] << 24) | (cdb[11] << 16) |
2912 (cdb[12] << 8) | cdb[13];
05d1c7c0 2913 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2914 break;
2915 case RECEIVE_DIAGNOSTIC:
2916 case SEND_DIAGNOSTIC:
2917 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2918 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2919 break;
2920/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2921#if 0
2922 case GPCMD_READ_CD:
2923 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2924 size = (2336 * sectors);
05d1c7c0 2925 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2926 break;
2927#endif
2928 case READ_TOC:
2929 size = cdb[8];
05d1c7c0 2930 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2931 break;
2932 case REQUEST_SENSE:
2933 size = cdb[4];
05d1c7c0 2934 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2935 break;
2936 case READ_ELEMENT_STATUS:
2937 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2938 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2939 break;
2940 case WRITE_BUFFER:
2941 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2942 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2943 break;
2944 case RESERVE:
2945 case RESERVE_10:
2946 /*
2947 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2948 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2949 */
2950 if (cdb[0] == RESERVE_10)
2951 size = (cdb[7] << 8) | cdb[8];
2952 else
2953 size = cmd->data_length;
2954
2955 /*
2956 * Setup the legacy emulated handler for SPC-2 and
2957 * >= SPC-3 compatible reservation handling (CRH=1)
2958 * Otherwise, we assume the underlying SCSI logic is
2959 * is running in SPC_PASSTHROUGH, and wants reservations
2960 * emulation disabled.
2961 */
2962 cmd->transport_emulate_cdb =
e3d6f909 2963 (su_dev->t10_pr.res_type !=
c66ac9db 2964 SPC_PASSTHROUGH) ?
e3d6f909 2965 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 2966 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2967 break;
2968 case RELEASE:
2969 case RELEASE_10:
2970 /*
2971 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2972 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2973 */
2974 if (cdb[0] == RELEASE_10)
2975 size = (cdb[7] << 8) | cdb[8];
2976 else
2977 size = cmd->data_length;
2978
2979 cmd->transport_emulate_cdb =
e3d6f909 2980 (su_dev->t10_pr.res_type !=
c66ac9db 2981 SPC_PASSTHROUGH) ?
e3d6f909 2982 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 2983 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2984 break;
2985 case SYNCHRONIZE_CACHE:
2986 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2987 /*
2988 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2989 */
2990 if (cdb[0] == SYNCHRONIZE_CACHE) {
2991 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2992 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2993 } else {
2994 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2995 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2996 }
2997 if (sector_ret)
2998 goto out_unsupported_cdb;
2999
3000 size = transport_get_size(sectors, cdb, cmd);
3001 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3002
3003 /*
3004 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3005 */
e3d6f909 3006 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3007 break;
3008 /*
3009 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3010 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3011 */
3012 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3013 /*
3014 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3015 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3016 */
7abbe7f3
NB		 3017 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3018 if (transport_cmd_get_valid_sectors(cmd) < 0)
3019 goto out_invalid_cdb_field;
3020 }
c66ac9db
NB		 3021 break;
3022 case UNMAP:
3023 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3024 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3025 break;
3026 case WRITE_SAME_16:
3027 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3028 if (sector_ret)
3029 goto out_unsupported_cdb;
dd3a5ad8 3030
6708bb27 3031 if (sectors)
12850626 3032 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3033 else {
3034 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3035 goto out_invalid_cdb_field;
3036 }
dd3a5ad8 3037
5db0753b 3038 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3039 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3040
3041 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3042 goto out_invalid_cdb_field;
3043 break;
3044 case WRITE_SAME:
3045 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3046 if (sector_ret)
3047 goto out_unsupported_cdb;
3048
3049 if (sectors)
12850626 3050 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3051 else {
3052 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3053 goto out_invalid_cdb_field;
c66ac9db 3054 }
706d5860
NB		 3055
3056 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3057 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3058 /*
3059 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3060 * of byte 1 bit 3 UNMAP instead of original reserved field
3061 */
3062 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3063 goto out_invalid_cdb_field;
c66ac9db
NB		 3064 break;
3065 case ALLOW_MEDIUM_REMOVAL:
3066 case GPCMD_CLOSE_TRACK:
3067 case ERASE:
3068 case INITIALIZE_ELEMENT_STATUS:
3069 case GPCMD_LOAD_UNLOAD:
3070 case REZERO_UNIT:
3071 case SEEK_10:
3072 case GPCMD_SET_SPEED:
3073 case SPACE:
3074 case START_STOP:
3075 case TEST_UNIT_READY:
3076 case VERIFY:
3077 case WRITE_FILEMARKS:
3078 case MOVE_MEDIUM:
3079 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3080 break;
3081 case REPORT_LUNS:
3082 cmd->transport_emulate_cdb =
e3d6f909 3083 transport_core_report_lun_response;
c66ac9db
NB		 3084 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3085 /*
3086 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3087 * See spc4r17 section 5.3
3088 */
5951146d 3089 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3090 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3091 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3092 break;
3093 default:
6708bb27 3094 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3095 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3096 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3097 goto out_unsupported_cdb;
3098 }
3099
3100 if (size != cmd->data_length) {
6708bb27 3101 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3102 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3103 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3104 cmd->data_length, size, cdb[0]);
3105
3106 cmd->cmd_spdtl = size;
3107
3108 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3109 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3110 " WRITE data\n");
3111 goto out_invalid_cdb_field;
3112 }
3113 /*
3114 * Reject READ_* or WRITE_* with overflow/underflow for
3115 * type SCF_SCSI_DATA_SG_IO_CDB.
3116 */
6708bb27
AG		 3117 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3118 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3119 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3120 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3121 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3122 goto out_invalid_cdb_field;
3123 }
3124
3125 if (size > cmd->data_length) {
3126 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3127 cmd->residual_count = (size - cmd->data_length);
3128 } else {
3129 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3130 cmd->residual_count = (cmd->data_length - size);
3131 }
3132 cmd->data_length = size;
3133 }
3134
d0229ae3
AG		 3135 /* Let's limit control cdbs to a page, for simplicity's sake. */
3136 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3137 size > PAGE_SIZE)
3138 goto out_invalid_cdb_field;
3139
c66ac9db
NB		 3140 transport_set_supported_SAM_opcode(cmd);
3141 return ret;
3142
3143out_unsupported_cdb:
3144 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3145 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3146 return -EINVAL;
c66ac9db
NB		 3147out_invalid_cdb_field:
3148 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3149 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3150 return -EINVAL;
c66ac9db
NB		 3151}
3152
c66ac9db 3153/*
35e0e757 3154 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3155 * and ordered cmds need to have their tasks added to the execution queue.
3156 */
3157static void transport_complete_task_attr(struct se_cmd *cmd)
3158{
5951146d 3159 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3160 struct se_cmd *cmd_p, *cmd_tmp;
3161 int new_active_tasks = 0;
3162
e66ecd50 3163 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3164 atomic_dec(&dev->simple_cmds);
3165 smp_mb__after_atomic_dec();
3166 dev->dev_cur_ordered_id++;
6708bb27 3167 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3168 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3169 cmd->se_ordered_id);
e66ecd50 3170 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3171 atomic_dec(&dev->dev_hoq_count);
3172 smp_mb__after_atomic_dec();
3173 dev->dev_cur_ordered_id++;
6708bb27 3174 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3175 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3176 cmd->se_ordered_id);
e66ecd50 3177 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3178 spin_lock(&dev->ordered_cmd_lock);
5951146d 3179 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3180 atomic_dec(&dev->dev_ordered_sync);
3181 smp_mb__after_atomic_dec();
3182 spin_unlock(&dev->ordered_cmd_lock);
3183
3184 dev->dev_cur_ordered_id++;
6708bb27 3185 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3186 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3187 }
3188 /*
3189 * Process all commands up to the last received
3190 * ORDERED task attribute which requires another blocking
3191 * boundary
3192 */
3193 spin_lock(&dev->delayed_cmd_lock);
3194 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3195 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3196
5951146d 3197 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3198 spin_unlock(&dev->delayed_cmd_lock);
3199
6708bb27 3200 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3201 " cmd_p: 0x%02x Task Attr: 0x%02x"
3202 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3203 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3204 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3205
3206 transport_add_tasks_from_cmd(cmd_p);
3207 new_active_tasks++;
3208
3209 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3210 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3211 break;
3212 }
3213 spin_unlock(&dev->delayed_cmd_lock);
3214 /*
3215 * If new tasks have become active, wake up the transport thread
3216 * to do the processing of the Active tasks.
3217 */
3218 if (new_active_tasks != 0)
e3d6f909 3219 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3220}
3221
e057f533 3222static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3223{
3224 int ret = 0;
3225
e057f533
CH		 3226 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3227 transport_complete_task_attr(cmd);
3228
3229 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3230 ret = cmd->se_tfo->queue_status(cmd);
3231 if (ret)
3232 goto out;
3233 }
07bde79a
NB		 3234
3235 switch (cmd->data_direction) {
3236 case DMA_FROM_DEVICE:
3237 ret = cmd->se_tfo->queue_data_in(cmd);
3238 break;
3239 case DMA_TO_DEVICE:
ec98f782 3240 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3241 ret = cmd->se_tfo->queue_data_in(cmd);
3242 if (ret < 0)
e057f533 3243 break;
07bde79a
NB		 3244 }
3245 /* Fall through for DMA_TO_DEVICE */
3246 case DMA_NONE:
3247 ret = cmd->se_tfo->queue_status(cmd);
3248 break;
3249 default:
3250 break;
3251 }
3252
e057f533
CH		 3253out:
3254 if (ret < 0) {
3255 transport_handle_queue_full(cmd, cmd->se_dev);
3256 return;
3257 }
3258 transport_lun_remove_cmd(cmd);
3259 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3260}
3261
3262static void transport_handle_queue_full(
3263 struct se_cmd *cmd,
e057f533 3264 struct se_device *dev)
07bde79a
NB		 3265{
3266 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3267 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3268 atomic_inc(&dev->dev_qf_count);
3269 smp_mb__after_atomic_inc();
3270 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3271
3272 schedule_work(&cmd->se_dev->qf_work_queue);
3273}
3274
35e0e757 3275static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3276{
35e0e757 3277 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3278 int reason = 0, ret;
35e0e757 3279
c66ac9db
NB		 3280 /*
3281 * Check if we need to move delayed/dormant tasks from cmds on the
3282 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3283 * Attribute.
3284 */
5951146d 3285 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3286 transport_complete_task_attr(cmd);
07bde79a
NB		 3287 /*
3288 * Check to schedule QUEUE_FULL work, or execute an existing
3289 * cmd->transport_qf_callback()
3290 */
3291 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3292 schedule_work(&cmd->se_dev->qf_work_queue);
3293
c66ac9db
NB		 3294 /*
3295 * Check if we need to retrieve a sense buffer from
3296 * the struct se_cmd in question.
3297 */
3298 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3299 if (transport_get_sense_data(cmd) < 0)
3300 reason = TCM_NON_EXISTENT_LUN;
3301
3302 /*
3303 * Only set when an struct se_task->task_scsi_status returned
3304 * a non GOOD status.
3305 */
3306 if (cmd->scsi_status) {
07bde79a 3307 ret = transport_send_check_condition_and_sense(
c66ac9db 3308 cmd, reason, 1);
f147abb4 3309 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3310 goto queue_full;
3311
c66ac9db
NB		 3312 transport_lun_remove_cmd(cmd);
3313 transport_cmd_check_stop_to_fabric(cmd);
3314 return;
3315 }
3316 }
3317 /*
25985edc 3318 * Check for a callback, used by amongst other things
c66ac9db
NB		 3319 * XDWRITE_READ_10 emulation.
3320 */
3321 if (cmd->transport_complete_callback)
3322 cmd->transport_complete_callback(cmd);
3323
3324 switch (cmd->data_direction) {
3325 case DMA_FROM_DEVICE:
3326 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3327 if (cmd->se_lun->lun_sep) {
3328 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3329 cmd->data_length;
3330 }
3331 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3332
07bde79a 3333 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3334 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3335 goto queue_full;
c66ac9db
NB		 3336 break;
3337 case DMA_TO_DEVICE:
3338 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3339 if (cmd->se_lun->lun_sep) {
3340 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3341 cmd->data_length;
3342 }
3343 spin_unlock(&cmd->se_lun->lun_sep_lock);
3344 /*
3345 * Check if we need to send READ payload for BIDI-COMMAND
3346 */
ec98f782 3347 if (cmd->t_bidi_data_sg) {
c66ac9db 3348 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3349 if (cmd->se_lun->lun_sep) {
3350 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3351 cmd->data_length;
3352 }
3353 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3354 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3355 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3356 goto queue_full;
c66ac9db
NB		 3357 break;
3358 }
3359 /* Fall through for DMA_TO_DEVICE */
3360 case DMA_NONE:
07bde79a 3361 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3362 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3363 goto queue_full;
c66ac9db
NB		 3364 break;
3365 default:
3366 break;
3367 }
3368
3369 transport_lun_remove_cmd(cmd);
3370 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3371 return;
3372
3373queue_full:
6708bb27 3374 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3375 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3376 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3377 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3378}
3379
3380static void transport_free_dev_tasks(struct se_cmd *cmd)
3381{
3382 struct se_task *task, *task_tmp;
3383 unsigned long flags;
0c2cfe5f 3384 LIST_HEAD(dispose_list);
c66ac9db 3385
a1d8b49a 3386 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3387 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3388 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3389 if (!(task->task_flags & TF_ACTIVE))
3390 list_move_tail(&task->t_list, &dispose_list);
3391 }
3392 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3393
3394 while (!list_empty(&dispose_list)) {
3395 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3396
af3f00c7
CH		 3397 if (task->task_sg != cmd->t_data_sg &&
3398 task->task_sg != cmd->t_bidi_data_sg)
3399 kfree(task->task_sg);
c66ac9db
NB		 3400
3401 list_del(&task->t_list);
3402
42bf829e 3403 cmd->se_dev->transport->free_task(task);
c66ac9db 3404 }
c66ac9db
NB		 3405}
3406
6708bb27 3407static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3408{
ec98f782 3409 struct scatterlist *sg;
ec98f782 3410 int count;
c66ac9db 3411
6708bb27
AG		 3412 for_each_sg(sgl, sg, nents, count)
3413 __free_page(sg_page(sg));
c66ac9db 3414
6708bb27
AG		 3415 kfree(sgl);
3416}
c66ac9db 3417
6708bb27
AG		 3418static inline void transport_free_pages(struct se_cmd *cmd)
3419{
3420 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3421 return;
3422
3423 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3424 cmd->t_data_sg = NULL;
3425 cmd->t_data_nents = 0;
c66ac9db 3426
6708bb27 3427 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3428 cmd->t_bidi_data_sg = NULL;
3429 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3430}
3431
d3df7825
CH		 3432/**
3433 * transport_put_cmd - release a reference to a command
3434 * @cmd: command to release
3435 *
3436 * This routine releases our reference to the command and frees it if possible.
3437 */
39c05f32 3438static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3439{
3440 unsigned long flags;
4911e3cc 3441 int free_tasks = 0;
c66ac9db 3442
a1d8b49a 3443 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3444 if (atomic_read(&cmd->t_fe_count)) {
3445 if (!atomic_dec_and_test(&cmd->t_fe_count))
3446 goto out_busy;
3447 }
3448
3449 if (atomic_read(&cmd->t_se_count)) {
3450 if (!atomic_dec_and_test(&cmd->t_se_count))
3451 goto out_busy;
3452 }
3453
3454 if (atomic_read(&cmd->transport_dev_active)) {
3455 atomic_set(&cmd->transport_dev_active, 0);
3456 transport_all_task_dev_remove_state(cmd);
3457 free_tasks = 1;
c66ac9db 3458 }
a1d8b49a 3459 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3460
4911e3cc
CH		 3461 if (free_tasks != 0)
3462 transport_free_dev_tasks(cmd);
d3df7825 3463
c66ac9db 3464 transport_free_pages(cmd);
31afc39c 3465 transport_release_cmd(cmd);
39c05f32 3466 return;
4911e3cc
CH		 3467out_busy:
3468 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3469}
3470
c66ac9db 3471/*
ec98f782
AG		 3472 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3473 * allocating in the core.
c66ac9db
NB		 3474 * @cmd: Associated se_cmd descriptor
3475 * @mem: SGL style memory for TCM WRITE / READ
3476 * @sg_mem_num: Number of SGL elements
3477 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3478 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3479 *
3480 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3481 * of parameters.
3482 */
3483int transport_generic_map_mem_to_cmd(
3484 struct se_cmd *cmd,
5951146d
AG		 3485 struct scatterlist *sgl,
3486 u32 sgl_count,
3487 struct scatterlist *sgl_bidi,
3488 u32 sgl_bidi_count)
c66ac9db 3489{
5951146d 3490 if (!sgl || !sgl_count)
c66ac9db 3491 return 0;
c66ac9db 3492
c66ac9db
NB		 3493 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3494 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3495
ec98f782
AG		 3496 cmd->t_data_sg = sgl;
3497 cmd->t_data_nents = sgl_count;
c66ac9db 3498
ec98f782
AG		 3499 if (sgl_bidi && sgl_bidi_count) {
3500 cmd->t_bidi_data_sg = sgl_bidi;
3501 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3502 }
3503 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3504 }
3505
3506 return 0;
3507}
3508EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3509
05d1c7c0
AG		 3510void *transport_kmap_first_data_page(struct se_cmd *cmd)
3511{
ec98f782 3512 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3513
ec98f782 3514 BUG_ON(!sg);
05d1c7c0 3515 /*
ec98f782
AG		 3516 * We need to take into account a possible offset here for fabrics like
3517 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3518 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3519 */
ec98f782 3520 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3521}
3522EXPORT_SYMBOL(transport_kmap_first_data_page);
3523
3524void transport_kunmap_first_data_page(struct se_cmd *cmd)
3525{
ec98f782 3526 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3527}
3528EXPORT_SYMBOL(transport_kunmap_first_data_page);
3529
c66ac9db 3530static int
05d1c7c0 3531transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3532{
ec98f782
AG		 3533 u32 length = cmd->data_length;
3534 unsigned int nents;
3535 struct page *page;
3536 int i = 0;
c66ac9db 3537
ec98f782
AG		 3538 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3539 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3540 if (!cmd->t_data_sg)
3541 return -ENOMEM;
c66ac9db 3542
ec98f782
AG		 3543 cmd->t_data_nents = nents;
3544 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3545
ec98f782
AG		 3546 while (length) {
3547 u32 page_len = min_t(u32, length, PAGE_SIZE);
3548 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3549 if (!page)
3550 goto out;
c66ac9db 3551
ec98f782
AG		 3552 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3553 length -= page_len;
3554 i++;
c66ac9db 3555 }
c66ac9db 3556 return 0;
c66ac9db 3557
ec98f782
AG		 3558out:
3559 while (i >= 0) {
3560 __free_page(sg_page(&cmd->t_data_sg[i]));
3561 i--;
c66ac9db 3562 }
ec98f782
AG		 3563 kfree(cmd->t_data_sg);
3564 cmd->t_data_sg = NULL;
3565 return -ENOMEM;
c66ac9db
NB		 3566}
3567
a1d8b49a
AG		 3568/* Reduce sectors if they are too long for the device */
3569static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3570 struct se_device *dev,
3571 unsigned long long lba,
a1d8b49a 3572 sector_t sectors)
c66ac9db 3573{
a1d8b49a 3574 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3575
a1d8b49a
AG		 3576 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3577 if ((lba + sectors) > transport_dev_end_lba(dev))
3578 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3579
a1d8b49a 3580 return sectors;
c66ac9db
NB		 3581}
3582
c66ac9db
NB		 3583
3584/*
3585 * This function can be used by HW target mode drivers to create a linked
3586 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3587 * This is intended to be called during the completion path by TCM Core
3588 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3589 */
3590void transport_do_task_sg_chain(struct se_cmd *cmd)
3591{
ec98f782
AG		 3592 struct scatterlist *sg_first = NULL;
3593 struct scatterlist *sg_prev = NULL;
3594 int sg_prev_nents = 0;
3595 struct scatterlist *sg;
c66ac9db 3596 struct se_task *task;
ec98f782 3597 u32 chained_nents = 0;
c66ac9db
NB		 3598 int i;
3599
ec98f782
AG		 3600 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3601
c66ac9db
NB		 3602 /*
3603 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3604 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3605 */
a1d8b49a 3606 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3607 if (!task->task_sg)
c66ac9db
NB		 3608 continue;
3609
ec98f782
AG		 3610 if (!sg_first) {
3611 sg_first = task->task_sg;
6708bb27 3612 chained_nents = task->task_sg_nents;
97868c89 3613 } else {
ec98f782 3614 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3615 chained_nents += task->task_sg_nents;
97868c89 3616 }
c3c74c7a
NB		 3617 /*
3618 * For the padded tasks, use the extra SGL vector allocated
3619 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3620 * offset into sg_chain() above.
3621 *
3622 * We do not need the padding for the last task (or a single
3623 * task), but in that case we will never use the sg_prev_nents
3624 * value below which would be incorrect.
c3c74c7a 3625 */
04629b7b 3626 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3627 sg_prev = task->task_sg;
c66ac9db
NB		 3628 }
3629 /*
3630 * Setup the starting pointer and total t_tasks_sg_linked_no including
3631 * padding SGs for linking and to mark the end.
3632 */
a1d8b49a 3633 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3634 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3635
6708bb27 3636 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3637 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3638 cmd->t_tasks_sg_chained_no);
c66ac9db 3639
a1d8b49a
AG		 3640 for_each_sg(cmd->t_tasks_sg_chained, sg,
3641 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3642
6708bb27 3643 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3644 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3645 if (sg_is_chain(sg))
6708bb27 3646 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3647 if (sg_is_last(sg))
6708bb27 3648 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3649 }
c66ac9db
NB		 3650}
3651EXPORT_SYMBOL(transport_do_task_sg_chain);
3652
a1d8b49a
AG		 3653/*
3654 * Break up cmd into chunks transport can handle
3655 */
38b40067
CH		 3656static int
3657transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3658 enum dma_data_direction data_direction,
38b40067 3659 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3660{
5951146d 3661 struct se_device *dev = cmd->se_dev;
a3eedc22 3662 int task_count, i;
38b40067
CH		 3663 unsigned long long lba;
3664 sector_t sectors, dev_max_sectors;
3665 u32 sector_size;
3666
3667 if (transport_cmd_get_valid_sectors(cmd) < 0)
3668 return -EINVAL;
3669
3670 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3671 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
a1d8b49a 3672
ec98f782 3673 WARN_ON(cmd->data_length % sector_size);
38b40067
CH		 3674
3675 lba = cmd->t_task_lba;
ec98f782 3676 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27 3677 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
af3f00c7
CH		 3678
3679 /*
3680 * If we need just a single task reuse the SG list in the command
3681 * and avoid a lot of work.
3682 */
3683 if (task_count == 1) {
3684 struct se_task *task;
3685 unsigned long flags;
3686
3687 task = transport_generic_get_task(cmd, data_direction);
3688 if (!task)
3689 return -ENOMEM;
3690
3691 task->task_sg = cmd_sg;
3692 task->task_sg_nents = sgl_nents;
3693
3694 task->task_lba = lba;
3695 task->task_sectors = sectors;
3696 task->task_size = task->task_sectors * sector_size;
3697
3698 spin_lock_irqsave(&cmd->t_state_lock, flags);
3699 list_add_tail(&task->t_list, &cmd->t_task_list);
3700 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3701
3702 return task_count;
3703 }
3704
ec98f782 3705 for (i = 0; i < task_count; i++) {
38b40067 3706 struct se_task *task;
c3c74c7a 3707 unsigned int task_size, task_sg_nents_padded;
38b40067
CH		 3708 struct scatterlist *sg;
3709 unsigned long flags;
ec98f782 3710 int count;
a1d8b49a 3711
c66ac9db 3712 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3713 if (!task)
ec98f782 3714 return -ENOMEM;
c66ac9db 3715
c66ac9db 3716 task->task_lba = lba;
ec98f782
AG		 3717 task->task_sectors = min(sectors, dev_max_sectors);
3718 task->task_size = task->task_sectors * sector_size;
c66ac9db 3719
525a48a2
NB		 3720 /*
3721 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3722 * in order to calculate the number per task SGL entries
3723 */
3724 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3725 /*
ec98f782
AG		 3726 * Check if the fabric module driver is requesting that all
3727 * struct se_task->task_sg[] be chained together.. If so,
3728 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3729 * marking the end of the chained SGL for every task except
3730 * the last one for (task_count > 1) operation, or skipping
3731 * the extra padding for the (task_count == 1) case.
c66ac9db 3732 */
c3c74c7a
NB		 3733 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3734 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3735 } else
3736 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3737
1d20bb61 3738 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3739 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3740 if (!task->task_sg) {
3741 cmd->se_dev->transport->free_task(task);
3742 return -ENOMEM;
3743 }
3744
c3c74c7a 3745 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3746
ec98f782
AG		 3747 task_size = task->task_size;
3748
3749 /* Build new sgl, only up to task_size */
6708bb27 3750 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3751 if (cmd_sg->length > task_size)
3752 break;
3753
3754 *sg = *cmd_sg;
3755 task_size -= cmd_sg->length;
3756 cmd_sg = sg_next(cmd_sg);
c66ac9db 3757 }
c66ac9db 3758
ec98f782
AG		 3759 lba += task->task_sectors;
3760 sectors -= task->task_sectors;
c66ac9db 3761
ec98f782
AG		 3762 spin_lock_irqsave(&cmd->t_state_lock, flags);
3763 list_add_tail(&task->t_list, &cmd->t_task_list);
3764 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3765 }
3766
ec98f782 3767 return task_count;
c66ac9db
NB		 3768}
3769
3770static int
ec98f782 3771transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3772{
c66ac9db 3773 struct se_task *task;
ec98f782 3774 unsigned long flags;
c66ac9db
NB		 3775
3776 task = transport_generic_get_task(cmd, cmd->data_direction);
3777 if (!task)
ec98f782 3778 return -ENOMEM;
c66ac9db 3779
af3f00c7 3780 task->task_sg = cmd->t_data_sg;
c66ac9db 3781 task->task_size = cmd->data_length;
6708bb27 3782 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3783
ec98f782
AG		 3784 spin_lock_irqsave(&cmd->t_state_lock, flags);
3785 list_add_tail(&task->t_list, &cmd->t_task_list);
3786 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3787
6708bb27 3788 /* Success! Return number of tasks allocated */
a3eedc22 3789 return 1;
ec98f782
AG		 3790}
3791
da0f7619
CH		 3792/*
3793 * Allocate any required ressources to execute the command, and either place
3794 * it on the execution queue if possible. For writes we might not have the
3795 * payload yet, thus notify the fabric via a call to ->write_pending instead.
c66ac9db 3796 */
a1d8b49a 3797int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3798{
da0f7619 3799 struct se_device *dev = cmd->se_dev;
9ac54987 3800 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3801 int set_counts = 1;
c66ac9db
NB		 3802 int ret = 0;
3803
3804 /*
3805 * Determine is the TCM fabric module has already allocated physical
3806 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3807 * beforehand.
c66ac9db 3808 */
ec98f782
AG		 3809 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3810 cmd->data_length) {
05d1c7c0 3811 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 3812 if (ret < 0)
3813 return ret;
3814 }
da0f7619 3815
1d20bb61 3816 /*
38b40067 3817 * For BIDI command set up the read tasks first.
1d20bb61 3818 */
da0f7619 3819 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3820 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3821 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3822
9ac54987
NB		 3823 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3824 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3825 cmd->t_bidi_data_nents);
3826 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3827 goto out_fail;
3828
3829 atomic_inc(&cmd->t_fe_count);
3830 atomic_inc(&cmd->t_se_count);
3831 set_counts = 0;
3832 }
38b40067
CH		 3833
3834 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3835 task_cdbs = transport_allocate_data_tasks(cmd,
3836 cmd->data_direction, cmd->t_data_sg,
3837 cmd->t_data_nents);
3838 } else {
3839 task_cdbs = transport_allocate_control_task(cmd);
3840 }
3841
da0f7619
CH		 3842 if (task_cdbs <= 0)
3843 goto out_fail;
3844
3845 if (set_counts) {
3846 atomic_inc(&cmd->t_fe_count);
3847 atomic_inc(&cmd->t_se_count);
3848 }
3849
9ac54987
NB		 3850 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3851 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3852 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3853
c66ac9db 3854 /*
a1d8b49a 3855 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3856 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3857 * will be added to the struct se_device execution queue after its WRITE
3858 * data has arrived. (ie: It gets handled by the transport processing
3859 * thread a second time)
3860 */
3861 if (cmd->data_direction == DMA_TO_DEVICE) {
3862 transport_add_tasks_to_state_queue(cmd);
3863 return transport_generic_write_pending(cmd);
3864 }
3865 /*
3866 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3867 * to the execution queue.
3868 */
3869 transport_execute_tasks(cmd);
3870 return 0;
da0f7619
CH		 3871
3872out_fail:
3873 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3874 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3875 return -EINVAL;
c66ac9db 3876}
a1d8b49a 3877EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3878
3879/* transport_generic_process_write():
3880 *
3881 *
3882 */
3883void transport_generic_process_write(struct se_cmd *cmd)
3884{
c66ac9db
NB		 3885 transport_execute_tasks(cmd);
3886}
3887EXPORT_SYMBOL(transport_generic_process_write);
3888
e057f533 3889static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3890{
f147abb4
NB		 3891 int ret;
3892
3893 ret = cmd->se_tfo->write_pending(cmd);
3894 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3895 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3896 cmd);
3897 transport_handle_queue_full(cmd, cmd->se_dev);
3898 }
07bde79a
NB		 3899}
3900
c66ac9db
NB		 3901static int transport_generic_write_pending(struct se_cmd *cmd)
3902{
3903 unsigned long flags;
3904 int ret;
3905
a1d8b49a 3906 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3907 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3908 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3909
c66ac9db
NB		 3910 /*
3911 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 3912 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 3913 * can be called from HW target mode interrupt code. This is safe
e3d6f909 3914 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3915 * because the se_cmd->se_lun pointer is not being cleared.
3916 */
3917 transport_cmd_check_stop(cmd, 1, 0);
3918
3919 /*
3920 * Call the fabric write_pending function here to let the
3921 * frontend know that WRITE buffers are ready.
3922 */
e3d6f909 3923 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3924 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3925 goto queue_full;
3926 else if (ret < 0)
c66ac9db
NB		 3927 return ret;
3928
3929 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 3930
3931queue_full:
6708bb27 3932 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3933 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3934 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3935 return 0;
c66ac9db
NB		 3936}
3937
2dbc43d2
CH		 3938/**
3939 * transport_release_cmd - free a command
3940 * @cmd: command to free
3941 *
3942 * This routine unconditionally frees a command, and reference counting
3943 * or list removal must be done in the caller.
3944 */
35462975 3945void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 3946{
e3d6f909 3947 BUG_ON(!cmd->se_tfo);
c66ac9db 3948
2dbc43d2
CH		 3949 if (cmd->se_tmr_req)
3950 core_tmr_release_req(cmd->se_tmr_req);
3951 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3952 kfree(cmd->t_task_cdb);
35462975 3953 cmd->se_tfo->release_cmd(cmd);
c66ac9db 3954}
35462975 3955EXPORT_SYMBOL(transport_release_cmd);
c66ac9db 3956
39c05f32 3957void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3958{
d14921d6
NB		 3959 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3960 if (wait_for_tasks && cmd->se_tmr_req)
3961 transport_wait_for_tasks(cmd);
3962
35462975 3963 transport_release_cmd(cmd);
d14921d6
NB		 3964 } else {
3965 if (wait_for_tasks)
3966 transport_wait_for_tasks(cmd);
3967
c66ac9db
NB		 3968 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3969
82f1c8a4 3970 if (cmd->se_lun)
c66ac9db 3971 transport_lun_remove_cmd(cmd);
c66ac9db 3972
f4366772
NB		 3973 transport_free_dev_tasks(cmd);
3974
39c05f32 3975 transport_put_cmd(cmd);
c66ac9db
NB		 3976 }
3977}
3978EXPORT_SYMBOL(transport_generic_free_cmd);
3979
c66ac9db
NB		 3980/* transport_lun_wait_for_tasks():
3981 *
3982 * Called from ConfigFS context to stop the passed struct se_cmd to allow
3983 * an struct se_lun to be successfully shutdown.
3984 */
3985static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
3986{
3987 unsigned long flags;
3988 int ret;
3989 /*
3990 * If the frontend has already requested this struct se_cmd to
3991 * be stopped, we can safely ignore this struct se_cmd.
3992 */
a1d8b49a
AG		 3993 spin_lock_irqsave(&cmd->t_state_lock, flags);
3994 if (atomic_read(&cmd->t_transport_stop)) {
3995 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 3996 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 3997 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 3998 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3999 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4000 return -EPERM;
c66ac9db 4001 }
a1d8b49a
AG		 4002 atomic_set(&cmd->transport_lun_fe_stop, 1);
4003 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4004
5951146d 4005 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4006
4007 ret = transport_stop_tasks_for_cmd(cmd);
4008
6708bb27
AG		 4009 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4010 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4011 if (!ret) {
6708bb27 4012 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4013 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4014 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4015 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4016 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4017 }
3df8d40b 4018 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4019
4020 return 0;
4021}
4022
c66ac9db
NB		 4023static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4024{
4025 struct se_cmd *cmd = NULL;
4026 unsigned long lun_flags, cmd_flags;
4027 /*
4028 * Do exception processing and return CHECK_CONDITION status to the
4029 * Initiator Port.
4030 */
4031 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4032 while (!list_empty(&lun->lun_cmd_list)) {
4033 cmd = list_first_entry(&lun->lun_cmd_list,
4034 struct se_cmd, se_lun_node);
4035 list_del(&cmd->se_lun_node);
4036
a1d8b49a 4037 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4038 /*
4039 * This will notify iscsi_target_transport.c:
4040 * transport_cmd_check_stop() that a LUN shutdown is in
4041 * progress for the iscsi_cmd_t.
4042 */
a1d8b49a 4043 spin_lock(&cmd->t_state_lock);
6708bb27 4044 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4045 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4046 cmd->se_lun->unpacked_lun,
4047 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4048 atomic_set(&cmd->transport_lun_stop, 1);
4049 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4050
4051 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4052
6708bb27
AG		 4053 if (!cmd->se_lun) {
4054 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4055 cmd->se_tfo->get_task_tag(cmd),
4056 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4057 BUG();
4058 }
4059 /*
4060 * If the Storage engine still owns the iscsi_cmd_t, determine
4061 * and/or stop its context.
4062 */
6708bb27 4063 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4064 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4065 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4066
e3d6f909 4067 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4068 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4069 continue;
4070 }
4071
6708bb27 4072 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4073 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4074 cmd->se_lun->unpacked_lun,
4075 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4076
a1d8b49a 4077 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4078 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4079 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4080 goto check_cond;
4081 }
a1d8b49a 4082 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4083 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4084 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4085
4086 transport_free_dev_tasks(cmd);
4087 /*
4088 * The Storage engine stopped this struct se_cmd before it was
4089 * send to the fabric frontend for delivery back to the
4090 * Initiator Node. Return this SCSI CDB back with an
4091 * CHECK_CONDITION status.
4092 */
4093check_cond:
4094 transport_send_check_condition_and_sense(cmd,
4095 TCM_NON_EXISTENT_LUN, 0);
4096 /*
4097 * If the fabric frontend is waiting for this iscsi_cmd_t to
4098 * be released, notify the waiting thread now that LU has
4099 * finished accessing it.
4100 */
a1d8b49a
AG		 4101 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4102 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4103 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4104 " struct se_cmd: %p ITT: 0x%08x\n",
4105 lun->unpacked_lun,
e3d6f909 4106 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4107
a1d8b49a 4108 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4109 cmd_flags);
4110 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4111 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4112 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4113 continue;
4114 }
6708bb27 4115 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4116 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4117
a1d8b49a 4118 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4119 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4120 }
4121 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4122}
4123
4124static int transport_clear_lun_thread(void *p)
4125{
4126 struct se_lun *lun = (struct se_lun *)p;
4127
4128 __transport_clear_lun_from_sessions(lun);
4129 complete(&lun->lun_shutdown_comp);
4130
4131 return 0;
4132}
4133
4134int transport_clear_lun_from_sessions(struct se_lun *lun)
4135{
4136 struct task_struct *kt;
4137
5951146d 4138 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4139 "tcm_cl_%u", lun->unpacked_lun);
4140 if (IS_ERR(kt)) {
6708bb27 4141 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4142 return PTR_ERR(kt);
c66ac9db
NB		 4143 }
4144 wait_for_completion(&lun->lun_shutdown_comp);
4145
4146 return 0;
4147}
4148
d14921d6
NB		 4149/**
4150 * transport_wait_for_tasks - wait for completion to occur
4151 * @cmd: command to wait
c66ac9db 4152 *
d14921d6
NB		 4153 * Called from frontend fabric context to wait for storage engine
4154 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4155 */
d14921d6 4156void transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4157{
4158 unsigned long flags;
4159
a1d8b49a 4160 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4161 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4162 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4163 return;
4164 }
4165 /*
4166 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4167 * has been set in transport_set_supported_SAM_opcode().
4168 */
4169 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4170 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4171 return;
4172 }
c66ac9db
NB		 4173 /*
4174 * If we are already stopped due to an external event (ie: LUN shutdown)
4175 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4176 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4177 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4178 * has completed its operation on the struct se_cmd.
4179 */
a1d8b49a 4180 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4181
6708bb27 4182 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4183 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4184 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4185 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4186 /*
4187 * There is a special case for WRITES where a FE exception +
4188 * LUN shutdown means ConfigFS context is still sleeping on
4189 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4190 * We go ahead and up transport_lun_stop_comp just to be sure
4191 * here.
4192 */
a1d8b49a
AG		 4193 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4194 complete(&cmd->transport_lun_stop_comp);
4195 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4196 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4197
4198 transport_all_task_dev_remove_state(cmd);
4199 /*
4200 * At this point, the frontend who was the originator of this
4201 * struct se_cmd, now owns the structure and can be released through
4202 * normal means below.
4203 */
6708bb27 4204 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4205 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4206 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4207 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4208
a1d8b49a 4209 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4210 }
a1d8b49a 4211 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4212 atomic_read(&cmd->t_transport_aborted)) {
4213 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4214 return;
4215 }
c66ac9db 4216
a1d8b49a 4217 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4218
6708bb27 4219 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
f2da9dbd
CH		 4220 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4221 cmd, cmd->se_tfo->get_task_tag(cmd),
4222 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4223
a1d8b49a 4224 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4225
5951146d 4226 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4227
a1d8b49a 4228 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4229
a1d8b49a
AG		 4230 spin_lock_irqsave(&cmd->t_state_lock, flags);
4231 atomic_set(&cmd->t_transport_active, 0);
4232 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4233
6708bb27 4234 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4235 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4236 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4237
d14921d6 4238 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4239}
d14921d6 4240EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4241
4242static int transport_get_sense_codes(
4243 struct se_cmd *cmd,
4244 u8 *asc,
4245 u8 *ascq)
4246{
4247 *asc = cmd->scsi_asc;
4248 *ascq = cmd->scsi_ascq;
4249
4250 return 0;
4251}
4252
4253static int transport_set_sense_codes(
4254 struct se_cmd *cmd,
4255 u8 asc,
4256 u8 ascq)
4257{
4258 cmd->scsi_asc = asc;
4259 cmd->scsi_ascq = ascq;
4260
4261 return 0;
4262}
4263
4264int transport_send_check_condition_and_sense(
4265 struct se_cmd *cmd,
4266 u8 reason,
4267 int from_transport)
4268{
4269 unsigned char *buffer = cmd->sense_buffer;
4270 unsigned long flags;
4271 int offset;
4272 u8 asc = 0, ascq = 0;
4273
a1d8b49a 4274 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4275 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4276 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4277 return 0;
4278 }
4279 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4280 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4281
4282 if (!reason && from_transport)
4283 goto after_reason;
4284
4285 if (!from_transport)
4286 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4287 /*
4288 * Data Segment and SenseLength of the fabric response PDU.
4289 *
4290 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4291 * from include/scsi/scsi_cmnd.h
4292 */
e3d6f909 4293 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4294 TRANSPORT_SENSE_BUFFER);
4295 /*
4296 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4297 * SENSE KEY values from include/scsi/scsi.h
4298 */
4299 switch (reason) {
4300 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4301 /* CURRENT ERROR */
4302 buffer[offset] = 0x70;
4303 /* ILLEGAL REQUEST */
4304 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4305 /* LOGICAL UNIT NOT SUPPORTED */
4306 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4307 break;
c66ac9db
NB		 4308 case TCM_UNSUPPORTED_SCSI_OPCODE:
4309 case TCM_SECTOR_COUNT_TOO_MANY:
4310 /* CURRENT ERROR */
4311 buffer[offset] = 0x70;
4312 /* ILLEGAL REQUEST */
4313 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4314 /* INVALID COMMAND OPERATION CODE */
4315 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4316 break;
4317 case TCM_UNKNOWN_MODE_PAGE:
4318 /* CURRENT ERROR */
4319 buffer[offset] = 0x70;
4320 /* ILLEGAL REQUEST */
4321 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4322 /* INVALID FIELD IN CDB */
4323 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4324 break;
4325 case TCM_CHECK_CONDITION_ABORT_CMD:
4326 /* CURRENT ERROR */
4327 buffer[offset] = 0x70;
4328 /* ABORTED COMMAND */
4329 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4330 /* BUS DEVICE RESET FUNCTION OCCURRED */
4331 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4332 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4333 break;
4334 case TCM_INCORRECT_AMOUNT_OF_DATA:
4335 /* CURRENT ERROR */
4336 buffer[offset] = 0x70;
4337 /* ABORTED COMMAND */
4338 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4339 /* WRITE ERROR */
4340 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4341 /* NOT ENOUGH UNSOLICITED DATA */
4342 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4343 break;
4344 case TCM_INVALID_CDB_FIELD:
4345 /* CURRENT ERROR */
4346 buffer[offset] = 0x70;
4347 /* ABORTED COMMAND */
4348 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4349 /* INVALID FIELD IN CDB */
4350 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4351 break;
4352 case TCM_INVALID_PARAMETER_LIST:
4353 /* CURRENT ERROR */
4354 buffer[offset] = 0x70;
4355 /* ABORTED COMMAND */
4356 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4357 /* INVALID FIELD IN PARAMETER LIST */
4358 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4359 break;
4360 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4361 /* CURRENT ERROR */
4362 buffer[offset] = 0x70;
4363 /* ABORTED COMMAND */
4364 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4365 /* WRITE ERROR */
4366 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4367 /* UNEXPECTED_UNSOLICITED_DATA */
4368 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4369 break;
4370 case TCM_SERVICE_CRC_ERROR:
4371 /* CURRENT ERROR */
4372 buffer[offset] = 0x70;
4373 /* ABORTED COMMAND */
4374 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4375 /* PROTOCOL SERVICE CRC ERROR */
4376 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4377 /* N/A */
4378 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4379 break;
4380 case TCM_SNACK_REJECTED:
4381 /* CURRENT ERROR */
4382 buffer[offset] = 0x70;
4383 /* ABORTED COMMAND */
4384 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4385 /* READ ERROR */
4386 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4387 /* FAILED RETRANSMISSION REQUEST */
4388 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4389 break;
4390 case TCM_WRITE_PROTECTED:
4391 /* CURRENT ERROR */
4392 buffer[offset] = 0x70;
4393 /* DATA PROTECT */
4394 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4395 /* WRITE PROTECTED */
4396 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4397 break;
4398 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4399 /* CURRENT ERROR */
4400 buffer[offset] = 0x70;
4401 /* UNIT ATTENTION */
4402 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4403 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4404 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4405 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4406 break;
4407 case TCM_CHECK_CONDITION_NOT_READY:
4408 /* CURRENT ERROR */
4409 buffer[offset] = 0x70;
4410 /* Not Ready */
4411 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4412 transport_get_sense_codes(cmd, &asc, &ascq);
4413 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4414 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4415 break;
4416 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4417 default:
4418 /* CURRENT ERROR */
4419 buffer[offset] = 0x70;
4420 /* ILLEGAL REQUEST */
4421 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4422 /* LOGICAL UNIT COMMUNICATION FAILURE */
4423 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4424 break;
4425 }
4426 /*
4427 * This code uses linux/include/scsi/scsi.h SAM status codes!
4428 */
4429 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4430 /*
4431 * Automatically padded, this value is encoded in the fabric's
4432 * data_length response PDU containing the SCSI defined sense data.
4433 */
4434 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4435
4436after_reason:
07bde79a 4437 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4438}
4439EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4440
4441int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4442{
4443 int ret = 0;
4444
a1d8b49a 4445 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4446 if (!send_status ||
c66ac9db
NB		 4447 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4448 return 1;
4449#if 0
6708bb27 4450 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4451 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4452 cmd->t_task_cdb[0],
e3d6f909 4453 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4454#endif
4455 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4456 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4457 ret = 1;
4458 }
4459 return ret;
4460}
4461EXPORT_SYMBOL(transport_check_aborted_status);
4462
4463void transport_send_task_abort(struct se_cmd *cmd)
4464{
c252f003
NB		 4465 unsigned long flags;
4466
4467 spin_lock_irqsave(&cmd->t_state_lock, flags);
4468 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4469 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4470 return;
4471 }
4472 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4473
c66ac9db
NB		 4474 /*
4475 * If there are still expected incoming fabric WRITEs, we wait
4476 * until until they have completed before sending a TASK_ABORTED
4477 * response. This response with TASK_ABORTED status will be
4478 * queued back to fabric module by transport_check_aborted_status().
4479 */
4480 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4481 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4482 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4483 smp_mb__after_atomic_inc();
4484 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4485 transport_new_cmd_failure(cmd);
4486 return;
4487 }
4488 }
4489 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4490#if 0
6708bb27 4491 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4492 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4493 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4494#endif
e3d6f909 4495 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4496}
4497
4498/* transport_generic_do_tmr():
4499 *
4500 *
4501 */
4502int transport_generic_do_tmr(struct se_cmd *cmd)
4503{
5951146d 4504 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4505 struct se_tmr_req *tmr = cmd->se_tmr_req;
4506 int ret;
4507
4508 switch (tmr->function) {
5c6cd613 4509 case TMR_ABORT_TASK:
c66ac9db
NB		 4510 tmr->response = TMR_FUNCTION_REJECTED;
4511 break;
5c6cd613
NB		 4512 case TMR_ABORT_TASK_SET:
4513 case TMR_CLEAR_ACA:
4514 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4515 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4516 break;
5c6cd613 4517 case TMR_LUN_RESET:
c66ac9db
NB		 4518 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4519 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4520 TMR_FUNCTION_REJECTED;
4521 break;
5c6cd613 4522 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4523 tmr->response = TMR_FUNCTION_REJECTED;
4524 break;
5c6cd613 4525 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4526 tmr->response = TMR_FUNCTION_REJECTED;
4527 break;
c66ac9db 4528 default:
6708bb27 4529 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4530 tmr->function);
4531 tmr->response = TMR_FUNCTION_REJECTED;
4532 break;
4533 }
4534
4535 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4536 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4537
b7b8bef7 4538 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4539 return 0;
4540}
4541
c66ac9db
NB		 4542/* transport_processing_thread():
4543 *
4544 *
4545 */
4546static int transport_processing_thread(void *param)
4547{
5951146d 4548 int ret;
c66ac9db
NB		 4549 struct se_cmd *cmd;
4550 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 4551
4552 set_user_nice(current, -20);
4553
4554 while (!kthread_should_stop()) {
e3d6f909
AG		 4555 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4556 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4557 kthread_should_stop());
4558 if (ret < 0)
4559 goto out;
4560
c66ac9db
NB		 4561get_cmd:
4562 __transport_execute_tasks(dev);
4563
5951146d
AG		 4564 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4565 if (!cmd)
c66ac9db
NB		 4566 continue;
4567
5951146d 4568 switch (cmd->t_state) {
680b73c5
CH		 4569 case TRANSPORT_NEW_CMD:
4570 BUG();
4571 break;
c66ac9db 4572 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4573 if (!cmd->se_tfo->new_cmd_map) {
4574 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4575 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4576 BUG();
4577 }
e3d6f909 4578 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 4579 if (ret < 0) {
4580 cmd->transport_error_status = ret;
4499dda8 4581 transport_generic_request_failure(cmd,
c66ac9db
NB		 4582 0, (cmd->data_direction !=
4583 DMA_TO_DEVICE));
4584 break;
4585 }
c66ac9db 4586 ret = transport_generic_new_cmd(cmd);
f147abb4 4587 if (ret < 0) {
c66ac9db 4588 cmd->transport_error_status = ret;
4499dda8 4589 transport_generic_request_failure(cmd,
c66ac9db
NB		 4590 0, (cmd->data_direction !=
4591 DMA_TO_DEVICE));
4592 }
4593 break;
4594 case TRANSPORT_PROCESS_WRITE:
4595 transport_generic_process_write(cmd);
4596 break;
c66ac9db
NB		 4597 case TRANSPORT_PROCESS_TMR:
4598 transport_generic_do_tmr(cmd);
4599 break;
07bde79a 4600 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4601 transport_write_pending_qf(cmd);
4602 break;
4603 case TRANSPORT_COMPLETE_QF_OK:
4604 transport_complete_qf(cmd);
07bde79a 4605 break;
c66ac9db 4606 default:
f2da9dbd
CH		 4607 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4608 "i_state: %d on SE LUN: %u\n",
4609 cmd->t_state,
e3d6f909
AG		 4610 cmd->se_tfo->get_task_tag(cmd),
4611 cmd->se_tfo->get_cmd_state(cmd),
4612 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4613 BUG();
4614 }
4615
4616 goto get_cmd;
4617 }
4618
4619out:
ce8762f6
NB		 4620 WARN_ON(!list_empty(&dev->state_task_list));
4621 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4622 dev->process_thread = NULL;
4623 return 0;
4624}
Linux kernel - Deliverables
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