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Linux 3.3-rc4
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
c66ac9db
NB		 40#include <asm/unaligned.h>
41#include <net/sock.h>
42#include <net/tcp.h>
43#include <scsi/scsi.h>
44#include <scsi/scsi_cmnd.h>
e66ecd50 45#include <scsi/scsi_tcq.h>
c66ac9db
NB		 46
47#include <target/target_core_base.h>
c4795fb2
CH		 48#include <target/target_core_backend.h>
49#include <target/target_core_fabric.h>
c66ac9db
NB		 50#include <target/target_core_configfs.h>
51
e26d99ae 52#include "target_core_internal.h"
c66ac9db 53#include "target_core_alua.h"
c66ac9db 54#include "target_core_pr.h"
c66ac9db
NB		 55#include "target_core_ua.h"
56
e3d6f909 57static int sub_api_initialized;
c66ac9db 58
35e0e757 59static struct workqueue_struct *target_completion_wq;
c66ac9db
NB		 60static struct kmem_cache *se_sess_cache;
61struct kmem_cache *se_tmr_req_cache;
62struct kmem_cache *se_ua_cache;
c66ac9db
NB		 63struct kmem_cache *t10_pr_reg_cache;
64struct kmem_cache *t10_alua_lu_gp_cache;
65struct kmem_cache *t10_alua_lu_gp_mem_cache;
66struct kmem_cache *t10_alua_tg_pt_gp_cache;
67struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
68
c66ac9db 69static int transport_generic_write_pending(struct se_cmd *);
5951146d 70static int transport_processing_thread(void *param);
4d2300cc 71static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
c66ac9db 72static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 73static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 74 struct se_device *dev);
c66ac9db 75static void transport_free_dev_tasks(struct se_cmd *cmd);
05d1c7c0 76static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 77static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 78static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 79static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
03e98c9e 80static void transport_generic_request_failure(struct se_cmd *);
35e0e757 81static void target_complete_ok_work(struct work_struct *work);
c66ac9db 82
e3d6f909 83int init_se_kmem_caches(void)
c66ac9db 84{
c66ac9db
NB		 85 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
86 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
87 0, NULL);
6708bb27
AG		 88 if (!se_tmr_req_cache) {
89 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db 90 " failed\n");
97c34f3b 91 goto out;
c66ac9db
NB		 92 }
93 se_sess_cache = kmem_cache_create("se_sess_cache",
94 sizeof(struct se_session), __alignof__(struct se_session),
95 0, NULL);
6708bb27
AG		 96 if (!se_sess_cache) {
97 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 98 " failed\n");
35e0e757 99 goto out_free_tmr_req_cache;
c66ac9db
NB		 100 }
101 se_ua_cache = kmem_cache_create("se_ua_cache",
102 sizeof(struct se_ua), __alignof__(struct se_ua),
103 0, NULL);
6708bb27
AG		 104 if (!se_ua_cache) {
105 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 106 goto out_free_sess_cache;
c66ac9db 107 }
c66ac9db
NB		 108 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
109 sizeof(struct t10_pr_registration),
110 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 111 if (!t10_pr_reg_cache) {
112 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 113 " failed\n");
35e0e757 114 goto out_free_ua_cache;
c66ac9db
NB		 115 }
116 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
117 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
118 0, NULL);
6708bb27
AG		 119 if (!t10_alua_lu_gp_cache) {
120 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 121 " failed\n");
35e0e757 122 goto out_free_pr_reg_cache;
c66ac9db
NB		 123 }
124 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
125 sizeof(struct t10_alua_lu_gp_member),
126 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 127 if (!t10_alua_lu_gp_mem_cache) {
128 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 129 "cache failed\n");
35e0e757 130 goto out_free_lu_gp_cache;
c66ac9db
NB		 131 }
132 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
133 sizeof(struct t10_alua_tg_pt_gp),
134 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 135 if (!t10_alua_tg_pt_gp_cache) {
136 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 137 "cache failed\n");
35e0e757 138 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 139 }
140 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
141 "t10_alua_tg_pt_gp_mem_cache",
142 sizeof(struct t10_alua_tg_pt_gp_member),
143 __alignof__(struct t10_alua_tg_pt_gp_member),
144 0, NULL);
6708bb27
AG		 145 if (!t10_alua_tg_pt_gp_mem_cache) {
146 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 147 "mem_t failed\n");
35e0e757 148 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 149 }
150
35e0e757
CH		 151 target_completion_wq = alloc_workqueue("target_completion",
152 WQ_MEM_RECLAIM, 0);
153 if (!target_completion_wq)
154 goto out_free_tg_pt_gp_mem_cache;
155
c66ac9db 156 return 0;
35e0e757
CH		 157
158out_free_tg_pt_gp_mem_cache:
159 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
160out_free_tg_pt_gp_cache:
161 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
162out_free_lu_gp_mem_cache:
163 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
164out_free_lu_gp_cache:
165 kmem_cache_destroy(t10_alua_lu_gp_cache);
166out_free_pr_reg_cache:
167 kmem_cache_destroy(t10_pr_reg_cache);
168out_free_ua_cache:
169 kmem_cache_destroy(se_ua_cache);
170out_free_sess_cache:
171 kmem_cache_destroy(se_sess_cache);
172out_free_tmr_req_cache:
173 kmem_cache_destroy(se_tmr_req_cache);
c66ac9db 174out:
e3d6f909 175 return -ENOMEM;
c66ac9db
NB		 176}
177
e3d6f909 178void release_se_kmem_caches(void)
c66ac9db 179{
35e0e757 180 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 181 kmem_cache_destroy(se_tmr_req_cache);
182 kmem_cache_destroy(se_sess_cache);
183 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 184 kmem_cache_destroy(t10_pr_reg_cache);
185 kmem_cache_destroy(t10_alua_lu_gp_cache);
186 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
187 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
188 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 189}
190
e3d6f909
AG		 191/* This code ensures unique mib indexes are handed out. */
192static DEFINE_SPINLOCK(scsi_mib_index_lock);
193static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 194
195/*
196 * Allocate a new row index for the entry type specified
197 */
198u32 scsi_get_new_index(scsi_index_t type)
199{
200 u32 new_index;
201
e3d6f909 202 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 203
e3d6f909
AG		 204 spin_lock(&scsi_mib_index_lock);
205 new_index = ++scsi_mib_index[type];
206 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 207
208 return new_index;
209}
210
e26d99ae 211static void transport_init_queue_obj(struct se_queue_obj *qobj)
c66ac9db
NB		 212{
213 atomic_set(&qobj->queue_cnt, 0);
214 INIT_LIST_HEAD(&qobj->qobj_list);
215 init_waitqueue_head(&qobj->thread_wq);
216 spin_lock_init(&qobj->cmd_queue_lock);
217}
c66ac9db 218
dbc5623e 219void transport_subsystem_check_init(void)
c66ac9db
NB		 220{
221 int ret;
222
dbc5623e
NB		 223 if (sub_api_initialized)
224 return;
225
c66ac9db
NB		 226 ret = request_module("target_core_iblock");
227 if (ret != 0)
6708bb27 228 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 229
230 ret = request_module("target_core_file");
231 if (ret != 0)
6708bb27 232 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 233
234 ret = request_module("target_core_pscsi");
235 if (ret != 0)
6708bb27 236 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 237
238 ret = request_module("target_core_stgt");
239 if (ret != 0)
6708bb27 240 pr_err("Unable to load target_core_stgt\n");
c66ac9db 241
e3d6f909 242 sub_api_initialized = 1;
dbc5623e 243 return;
c66ac9db
NB		 244}
245
246struct se_session *transport_init_session(void)
247{
248 struct se_session *se_sess;
249
250 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 251 if (!se_sess) {
252 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 253 " se_sess_cache\n");
254 return ERR_PTR(-ENOMEM);
255 }
256 INIT_LIST_HEAD(&se_sess->sess_list);
257 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d
NB		 258 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
259 INIT_LIST_HEAD(&se_sess->sess_wait_list);
260 spin_lock_init(&se_sess->sess_cmd_lock);
c66ac9db
NB		 261
262 return se_sess;
263}
264EXPORT_SYMBOL(transport_init_session);
265
266/*
267 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
268 */
269void __transport_register_session(
270 struct se_portal_group *se_tpg,
271 struct se_node_acl *se_nacl,
272 struct se_session *se_sess,
273 void *fabric_sess_ptr)
274{
275 unsigned char buf[PR_REG_ISID_LEN];
276
277 se_sess->se_tpg = se_tpg;
278 se_sess->fabric_sess_ptr = fabric_sess_ptr;
279 /*
280 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
281 *
282 * Only set for struct se_session's that will actually be moving I/O.
283 * eg: *NOT* discovery sessions.
284 */
285 if (se_nacl) {
286 /*
287 * If the fabric module supports an ISID based TransportID,
288 * save this value in binary from the fabric I_T Nexus now.
289 */
e3d6f909 290 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 291 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 292 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 293 &buf[0], PR_REG_ISID_LEN);
294 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
295 }
296 spin_lock_irq(&se_nacl->nacl_sess_lock);
297 /*
298 * The se_nacl->nacl_sess pointer will be set to the
299 * last active I_T Nexus for each struct se_node_acl.
300 */
301 se_nacl->nacl_sess = se_sess;
302
303 list_add_tail(&se_sess->sess_acl_list,
304 &se_nacl->acl_sess_list);
305 spin_unlock_irq(&se_nacl->nacl_sess_lock);
306 }
307 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
308
6708bb27 309 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 310 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 311}
312EXPORT_SYMBOL(__transport_register_session);
313
314void transport_register_session(
315 struct se_portal_group *se_tpg,
316 struct se_node_acl *se_nacl,
317 struct se_session *se_sess,
318 void *fabric_sess_ptr)
319{
320 spin_lock_bh(&se_tpg->session_lock);
321 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
322 spin_unlock_bh(&se_tpg->session_lock);
323}
324EXPORT_SYMBOL(transport_register_session);
325
326void transport_deregister_session_configfs(struct se_session *se_sess)
327{
328 struct se_node_acl *se_nacl;
23388864 329 unsigned long flags;
c66ac9db
NB		 330 /*
331 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
332 */
333 se_nacl = se_sess->se_node_acl;
6708bb27 334 if (se_nacl) {
23388864 335 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 336 list_del(&se_sess->sess_acl_list);
337 /*
338 * If the session list is empty, then clear the pointer.
339 * Otherwise, set the struct se_session pointer from the tail
340 * element of the per struct se_node_acl active session list.
341 */
342 if (list_empty(&se_nacl->acl_sess_list))
343 se_nacl->nacl_sess = NULL;
344 else {
345 se_nacl->nacl_sess = container_of(
346 se_nacl->acl_sess_list.prev,
347 struct se_session, sess_acl_list);
348 }
23388864 349 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 350 }
351}
352EXPORT_SYMBOL(transport_deregister_session_configfs);
353
354void transport_free_session(struct se_session *se_sess)
355{
356 kmem_cache_free(se_sess_cache, se_sess);
357}
358EXPORT_SYMBOL(transport_free_session);
359
360void transport_deregister_session(struct se_session *se_sess)
361{
362 struct se_portal_group *se_tpg = se_sess->se_tpg;
363 struct se_node_acl *se_nacl;
e63a8e19 364 unsigned long flags;
c66ac9db 365
6708bb27 366 if (!se_tpg) {
c66ac9db
NB		 367 transport_free_session(se_sess);
368 return;
369 }
c66ac9db 370
e63a8e19 371 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 372 list_del(&se_sess->sess_list);
373 se_sess->se_tpg = NULL;
374 se_sess->fabric_sess_ptr = NULL;
e63a8e19 375 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 376
377 /*
378 * Determine if we need to do extra work for this initiator node's
379 * struct se_node_acl if it had been previously dynamically generated.
380 */
381 se_nacl = se_sess->se_node_acl;
6708bb27 382 if (se_nacl) {
e63a8e19 383 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 384 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 385 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
386 se_tpg)) {
c66ac9db
NB		 387 list_del(&se_nacl->acl_list);
388 se_tpg->num_node_acls--;
e63a8e19 389 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 390
391 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 392 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 393 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 394 se_nacl);
e63a8e19 395 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 396 }
397 }
e63a8e19 398 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 399 }
400
401 transport_free_session(se_sess);
402
6708bb27 403 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 404 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 405}
406EXPORT_SYMBOL(transport_deregister_session);
407
408/*
a1d8b49a 409 * Called with cmd->t_state_lock held.
c66ac9db
NB		 410 */
411static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
412{
42bf829e 413 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 414 struct se_task *task;
415 unsigned long flags;
416
42bf829e
CH		 417 if (!dev)
418 return;
c66ac9db 419
42bf829e 420 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 421 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 422 continue;
423
c66ac9db 424 spin_lock_irqsave(&dev->execute_task_lock, flags);
1880807a
CH		 425 if (task->t_state_active) {
426 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
427 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db 428
1880807a
CH		 429 list_del(&task->t_state_list);
430 atomic_dec(&cmd->t_task_cdbs_ex_left);
431 task->t_state_active = false;
432 }
433 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db 434 }
1880807a 435
c66ac9db
NB		 436}
437
438/* transport_cmd_check_stop():
439 *
440 * 'transport_off = 1' determines if t_transport_active should be cleared.
441 * 'transport_off = 2' determines if task_dev_state should be removed.
442 *
443 * A non-zero u8 t_state sets cmd->t_state.
444 * Returns 1 when command is stopped, else 0.
445 */
446static int transport_cmd_check_stop(
447 struct se_cmd *cmd,
448 int transport_off,
449 u8 t_state)
450{
451 unsigned long flags;
452
a1d8b49a 453 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 454 /*
455 * Determine if IOCTL context caller in requesting the stopping of this
456 * command for LUN shutdown purposes.
457 */
a1d8b49a 458 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 459 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 460 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 461 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 462
a1d8b49a 463 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 464 if (transport_off == 2)
465 transport_all_task_dev_remove_state(cmd);
a1d8b49a 466 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 467
a1d8b49a 468 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 469 return 1;
470 }
471 /*
472 * Determine if frontend context caller is requesting the stopping of
e3d6f909 473 * this command for frontend exceptions.
c66ac9db 474 */
a1d8b49a 475 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 476 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 477 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 478 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 479
c66ac9db
NB		 480 if (transport_off == 2)
481 transport_all_task_dev_remove_state(cmd);
482
483 /*
484 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
485 * to FE.
486 */
487 if (transport_off == 2)
488 cmd->se_lun = NULL;
a1d8b49a 489 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 490
a1d8b49a 491 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 492 return 1;
493 }
494 if (transport_off) {
a1d8b49a 495 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 496 if (transport_off == 2) {
497 transport_all_task_dev_remove_state(cmd);
498 /*
499 * Clear struct se_cmd->se_lun before the transport_off == 2
500 * handoff to fabric module.
501 */
502 cmd->se_lun = NULL;
503 /*
504 * Some fabric modules like tcm_loop can release
25985edc 505 * their internally allocated I/O reference now and
c66ac9db 506 * struct se_cmd now.
88dd9e26
NB		 507 *
508 * Fabric modules are expected to return '1' here if the
509 * se_cmd being passed is released at this point,
510 * or zero if not being released.
c66ac9db 511 */
e3d6f909 512 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 513 spin_unlock_irqrestore(
a1d8b49a 514 &cmd->t_state_lock, flags);
c66ac9db 515
88dd9e26 516 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 517 }
518 }
a1d8b49a 519 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 520
521 return 0;
522 } else if (t_state)
523 cmd->t_state = t_state;
a1d8b49a 524 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 525
526 return 0;
527}
528
529static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
530{
531 return transport_cmd_check_stop(cmd, 2, 0);
532}
533
534static void transport_lun_remove_cmd(struct se_cmd *cmd)
535{
e3d6f909 536 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 537 unsigned long flags;
538
539 if (!lun)
540 return;
541
a1d8b49a 542 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 543 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 545 goto check_lun;
546 }
a1d8b49a 547 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 548 transport_all_task_dev_remove_state(cmd);
a1d8b49a 549 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 550
c66ac9db
NB		 551
552check_lun:
553 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 554 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 555 list_del(&cmd->se_lun_node);
a1d8b49a 556 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 557#if 0
6708bb27 558 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 559 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 560#endif
561 }
562 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
563}
564
565void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
566{
8dc52b54
NB		 567 if (!cmd->se_tmr_req)
568 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 569
570 if (transport_cmd_check_stop_to_fabric(cmd))
571 return;
77039d1e 572 if (remove) {
3df8d40b 573 transport_remove_cmd_from_queue(cmd);
e6a2573f 574 transport_put_cmd(cmd);
77039d1e 575 }
c66ac9db
NB		 576}
577
f7a5cc0b
CH		 578static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
579 bool at_head)
c66ac9db
NB		 580{
581 struct se_device *dev = cmd->se_dev;
e3d6f909 582 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 583 unsigned long flags;
584
c66ac9db 585 if (t_state) {
a1d8b49a 586 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 587 cmd->t_state = t_state;
a1d8b49a
AG		 588 atomic_set(&cmd->t_transport_active, 1);
589 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 590 }
591
592 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 593
594 /* If the cmd is already on the list, remove it before we add it */
595 if (!list_empty(&cmd->se_queue_node))
596 list_del(&cmd->se_queue_node);
597 else
598 atomic_inc(&qobj->queue_cnt);
599
f7a5cc0b 600 if (at_head)
07bde79a 601 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 602 else
07bde79a 603 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 604 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 605 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
606
c66ac9db 607 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 608}
609
5951146d
AG		 610static struct se_cmd *
611transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 612{
5951146d 613 struct se_cmd *cmd;
c66ac9db
NB		 614 unsigned long flags;
615
616 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
617 if (list_empty(&qobj->qobj_list)) {
618 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
619 return NULL;
620 }
5951146d 621 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 622
79a7fef2 623 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 624
79a7fef2 625 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 626 atomic_dec(&qobj->queue_cnt);
627 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
628
5951146d 629 return cmd;
c66ac9db
NB		 630}
631
3df8d40b 632static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 633{
3df8d40b 634 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 635 unsigned long flags;
636
637 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 638 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 639 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
640 return;
641 }
79a7fef2
RD		 642 atomic_set(&cmd->t_transport_queue_active, 0);
643 atomic_dec(&qobj->queue_cnt);
644 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 645 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
646
a1d8b49a 647 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 648 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 649 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 650 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 651 }
652}
653
654/*
655 * Completion function used by TCM subsystem plugins (such as FILEIO)
656 * for queueing up response from struct se_subsystem_api->do_task()
657 */
658void transport_complete_sync_cache(struct se_cmd *cmd, int good)
659{
a1d8b49a 660 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 661 struct se_task, t_list);
662
663 if (good) {
664 cmd->scsi_status = SAM_STAT_GOOD;
665 task->task_scsi_status = GOOD;
666 } else {
667 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
03e98c9e
NB		 668 task->task_se_cmd->scsi_sense_reason =
669 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
670
c66ac9db
NB		 671 }
672
673 transport_complete_task(task, good);
674}
675EXPORT_SYMBOL(transport_complete_sync_cache);
676
35e0e757
CH		 677static void target_complete_failure_work(struct work_struct *work)
678{
679 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
680
03e98c9e 681 transport_generic_request_failure(cmd);
35e0e757
CH		 682}
683
c66ac9db
NB		 684/* transport_complete_task():
685 *
686 * Called from interrupt and non interrupt context depending
687 * on the transport plugin.
688 */
689void transport_complete_task(struct se_task *task, int success)
690{
e3d6f909 691 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 692 struct se_device *dev = cmd->se_dev;
c66ac9db 693 unsigned long flags;
c66ac9db 694
a1d8b49a 695 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 696 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 697
698 /*
699 * See if any sense data exists, if so set the TASK_SENSE flag.
700 * Also check for any other post completion work that needs to be
701 * done by the plugins.
702 */
703 if (dev && dev->transport->transport_complete) {
704 if (dev->transport->transport_complete(task) != 0) {
705 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
ef804a84 706 task->task_flags |= TF_HAS_SENSE;
c66ac9db
NB		 707 success = 1;
708 }
709 }
710
711 /*
712 * See if we are waiting for outstanding struct se_task
713 * to complete for an exception condition
714 */
6c76bf95 715 if (task->task_flags & TF_REQUEST_STOP) {
a1d8b49a 716 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 717 complete(&task->task_stop_comp);
718 return;
719 }
2235007c
CH		 720
721 if (!success)
722 cmd->t_tasks_failed = 1;
723
c66ac9db
NB		 724 /*
725 * Decrement the outstanding t_task_cdbs_left count. The last
726 * struct se_task from struct se_cmd will complete itself into the
727 * device queue depending upon int success.
728 */
6708bb27 729 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
a1d8b49a 730 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 731 return;
732 }
733
2235007c 734 if (cmd->t_tasks_failed) {
41e16e98 735 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 736 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 737 } else {
a1d8b49a 738 atomic_set(&cmd->t_transport_complete, 1);
35e0e757 739 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 740 }
35e0e757 741
35e0e757
CH		 742 cmd->t_state = TRANSPORT_COMPLETE;
743 atomic_set(&cmd->t_transport_active, 1);
a1d8b49a 744 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 745
35e0e757 746 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 747}
748EXPORT_SYMBOL(transport_complete_task);
749
750/*
751 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
752 * struct se_task list are ready to be added to the active execution list
753 * struct se_device
754
755 * Called with se_dev_t->execute_task_lock called.
756 */
757static inline int transport_add_task_check_sam_attr(
758 struct se_task *task,
759 struct se_task *task_prev,
760 struct se_device *dev)
761{
762 /*
763 * No SAM Task attribute emulation enabled, add to tail of
764 * execution queue
765 */
766 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
767 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
768 return 0;
769 }
770 /*
771 * HEAD_OF_QUEUE attribute for received CDB, which means
772 * the first task that is associated with a struct se_cmd goes to
773 * head of the struct se_device->execute_task_list, and task_prev
774 * after that for each subsequent task
775 */
e66ecd50 776 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 777 list_add(&task->t_execute_list,
778 (task_prev != NULL) ?
779 &task_prev->t_execute_list :
780 &dev->execute_task_list);
781
6708bb27 782 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 783 " in execution queue\n",
6708bb27 784 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 785 return 1;
786 }
787 /*
788 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
789 * transitioned from Dermant -> Active state, and are added to the end
790 * of the struct se_device->execute_task_list
791 */
792 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
793 return 0;
794}
795
796/* __transport_add_task_to_execute_queue():
797 *
798 * Called with se_dev_t->execute_task_lock called.
799 */
800static void __transport_add_task_to_execute_queue(
801 struct se_task *task,
802 struct se_task *task_prev,
803 struct se_device *dev)
804{
805 int head_of_queue;
806
807 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
808 atomic_inc(&dev->execute_tasks);
809
1880807a 810 if (task->t_state_active)
c66ac9db
NB		 811 return;
812 /*
813 * Determine if this task needs to go to HEAD_OF_QUEUE for the
814 * state list as well. Running with SAM Task Attribute emulation
815 * will always return head_of_queue == 0 here
816 */
817 if (head_of_queue)
818 list_add(&task->t_state_list, (task_prev) ?
819 &task_prev->t_state_list :
820 &dev->state_task_list);
821 else
822 list_add_tail(&task->t_state_list, &dev->state_task_list);
823
1880807a 824 task->t_state_active = true;
c66ac9db 825
6708bb27 826 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 827 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 828 task, dev);
829}
830
831static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
832{
42bf829e 833 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 834 struct se_task *task;
835 unsigned long flags;
836
a1d8b49a
AG		 837 spin_lock_irqsave(&cmd->t_state_lock, flags);
838 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db 839 spin_lock(&dev->execute_task_lock);
1880807a
CH		 840 if (!task->t_state_active) {
841 list_add_tail(&task->t_state_list,
842 &dev->state_task_list);
843 task->t_state_active = true;
844
845 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
846 task->task_se_cmd->se_tfo->get_task_tag(
847 task->task_se_cmd), task, dev);
848 }
c66ac9db
NB		 849 spin_unlock(&dev->execute_task_lock);
850 }
a1d8b49a 851 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 852}
853
4d2300cc 854static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
c66ac9db 855{
5951146d 856 struct se_device *dev = cmd->se_dev;
c66ac9db 857 struct se_task *task, *task_prev = NULL;
c66ac9db 858
a1d8b49a 859 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 860 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 861 continue;
862 /*
863 * __transport_add_task_to_execute_queue() handles the
864 * SAM Task Attribute emulation if enabled
865 */
866 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 867 task_prev = task;
868 }
4d2300cc
NB		 869}
870
871static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
872{
873 unsigned long flags;
874 struct se_device *dev = cmd->se_dev;
875
876 spin_lock_irqsave(&dev->execute_task_lock, flags);
877 __transport_add_tasks_from_cmd(cmd);
c66ac9db 878 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 879}
880
04629b7b
CH		 881void __transport_remove_task_from_execute_queue(struct se_task *task,
882 struct se_device *dev)
883{
884 list_del_init(&task->t_execute_list);
885 atomic_dec(&dev->execute_tasks);
886}
887
e26d99ae 888static void transport_remove_task_from_execute_queue(
c66ac9db
NB		 889 struct se_task *task,
890 struct se_device *dev)
891{
892 unsigned long flags;
893
04629b7b 894 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 895 return;
af57c3ac 896
c66ac9db 897 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 898 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 899 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
900}
901
07bde79a 902/*
f147abb4 903 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 904 */
905
906static void target_qf_do_work(struct work_struct *work)
907{
908 struct se_device *dev = container_of(work, struct se_device,
909 qf_work_queue);
bcac364a 910 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 911 struct se_cmd *cmd, *cmd_tmp;
912
913 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 914 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
915 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 916
bcac364a 917 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 918 list_del(&cmd->se_qf_node);
919 atomic_dec(&dev->dev_qf_count);
920 smp_mb__after_atomic_dec();
07bde79a 921
6708bb27 922 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 923 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 924 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 925 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
926 : "UNKNOWN");
f7a5cc0b
CH		 927
928 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 929 }
07bde79a
NB		 930}
931
c66ac9db
NB		 932unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
933{
934 switch (cmd->data_direction) {
935 case DMA_NONE:
936 return "NONE";
937 case DMA_FROM_DEVICE:
938 return "READ";
939 case DMA_TO_DEVICE:
940 return "WRITE";
941 case DMA_BIDIRECTIONAL:
942 return "BIDI";
943 default:
944 break;
945 }
946
947 return "UNKNOWN";
948}
949
950void transport_dump_dev_state(
951 struct se_device *dev,
952 char *b,
953 int *bl)
954{
955 *bl += sprintf(b + *bl, "Status: ");
956 switch (dev->dev_status) {
957 case TRANSPORT_DEVICE_ACTIVATED:
958 *bl += sprintf(b + *bl, "ACTIVATED");
959 break;
960 case TRANSPORT_DEVICE_DEACTIVATED:
961 *bl += sprintf(b + *bl, "DEACTIVATED");
962 break;
963 case TRANSPORT_DEVICE_SHUTDOWN:
964 *bl += sprintf(b + *bl, "SHUTDOWN");
965 break;
966 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
967 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
968 *bl += sprintf(b + *bl, "OFFLINE");
969 break;
970 default:
971 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
972 break;
973 }
974
65586d51
NB		 975 *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d",
976 atomic_read(&dev->execute_tasks), dev->queue_depth);
c66ac9db 977 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 978 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 979 *bl += sprintf(b + *bl, " ");
980}
981
c66ac9db
NB		 982void transport_dump_vpd_proto_id(
983 struct t10_vpd *vpd,
984 unsigned char *p_buf,
985 int p_buf_len)
986{
987 unsigned char buf[VPD_TMP_BUF_SIZE];
988 int len;
989
990 memset(buf, 0, VPD_TMP_BUF_SIZE);
991 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
992
993 switch (vpd->protocol_identifier) {
994 case 0x00:
995 sprintf(buf+len, "Fibre Channel\n");
996 break;
997 case 0x10:
998 sprintf(buf+len, "Parallel SCSI\n");
999 break;
1000 case 0x20:
1001 sprintf(buf+len, "SSA\n");
1002 break;
1003 case 0x30:
1004 sprintf(buf+len, "IEEE 1394\n");
1005 break;
1006 case 0x40:
1007 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1008 " Protocol\n");
1009 break;
1010 case 0x50:
1011 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1012 break;
1013 case 0x60:
1014 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1015 break;
1016 case 0x70:
1017 sprintf(buf+len, "Automation/Drive Interface Transport"
1018 " Protocol\n");
1019 break;
1020 case 0x80:
1021 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1022 break;
1023 default:
1024 sprintf(buf+len, "Unknown 0x%02x\n",
1025 vpd->protocol_identifier);
1026 break;
1027 }
1028
1029 if (p_buf)
1030 strncpy(p_buf, buf, p_buf_len);
1031 else
6708bb27 1032 pr_debug("%s", buf);
c66ac9db
NB		 1033}
1034
1035void
1036transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1037{
1038 /*
1039 * Check if the Protocol Identifier Valid (PIV) bit is set..
1040 *
1041 * from spc3r23.pdf section 7.5.1
1042 */
1043 if (page_83[1] & 0x80) {
1044 vpd->protocol_identifier = (page_83[0] & 0xf0);
1045 vpd->protocol_identifier_set = 1;
1046 transport_dump_vpd_proto_id(vpd, NULL, 0);
1047 }
1048}
1049EXPORT_SYMBOL(transport_set_vpd_proto_id);
1050
1051int transport_dump_vpd_assoc(
1052 struct t10_vpd *vpd,
1053 unsigned char *p_buf,
1054 int p_buf_len)
1055{
1056 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1057 int ret = 0;
1058 int len;
c66ac9db
NB		 1059
1060 memset(buf, 0, VPD_TMP_BUF_SIZE);
1061 len = sprintf(buf, "T10 VPD Identifier Association: ");
1062
1063 switch (vpd->association) {
1064 case 0x00:
1065 sprintf(buf+len, "addressed logical unit\n");
1066 break;
1067 case 0x10:
1068 sprintf(buf+len, "target port\n");
1069 break;
1070 case 0x20:
1071 sprintf(buf+len, "SCSI target device\n");
1072 break;
1073 default:
1074 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1075 ret = -EINVAL;
c66ac9db
NB		 1076 break;
1077 }
1078
1079 if (p_buf)
1080 strncpy(p_buf, buf, p_buf_len);
1081 else
6708bb27 1082 pr_debug("%s", buf);
c66ac9db
NB		 1083
1084 return ret;
1085}
1086
1087int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1088{
1089 /*
1090 * The VPD identification association..
1091 *
1092 * from spc3r23.pdf Section 7.6.3.1 Table 297
1093 */
1094 vpd->association = (page_83[1] & 0x30);
1095 return transport_dump_vpd_assoc(vpd, NULL, 0);
1096}
1097EXPORT_SYMBOL(transport_set_vpd_assoc);
1098
1099int transport_dump_vpd_ident_type(
1100 struct t10_vpd *vpd,
1101 unsigned char *p_buf,
1102 int p_buf_len)
1103{
1104 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1105 int ret = 0;
1106 int len;
c66ac9db
NB		 1107
1108 memset(buf, 0, VPD_TMP_BUF_SIZE);
1109 len = sprintf(buf, "T10 VPD Identifier Type: ");
1110
1111 switch (vpd->device_identifier_type) {
1112 case 0x00:
1113 sprintf(buf+len, "Vendor specific\n");
1114 break;
1115 case 0x01:
1116 sprintf(buf+len, "T10 Vendor ID based\n");
1117 break;
1118 case 0x02:
1119 sprintf(buf+len, "EUI-64 based\n");
1120 break;
1121 case 0x03:
1122 sprintf(buf+len, "NAA\n");
1123 break;
1124 case 0x04:
1125 sprintf(buf+len, "Relative target port identifier\n");
1126 break;
1127 case 0x08:
1128 sprintf(buf+len, "SCSI name string\n");
1129 break;
1130 default:
1131 sprintf(buf+len, "Unsupported: 0x%02x\n",
1132 vpd->device_identifier_type);
e3d6f909 1133 ret = -EINVAL;
c66ac9db
NB		 1134 break;
1135 }
1136
e3d6f909
AG		 1137 if (p_buf) {
1138 if (p_buf_len < strlen(buf)+1)
1139 return -EINVAL;
c66ac9db 1140 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1141 } else {
6708bb27 1142 pr_debug("%s", buf);
e3d6f909 1143 }
c66ac9db
NB		 1144
1145 return ret;
1146}
1147
1148int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1149{
1150 /*
1151 * The VPD identifier type..
1152 *
1153 * from spc3r23.pdf Section 7.6.3.1 Table 298
1154 */
1155 vpd->device_identifier_type = (page_83[1] & 0x0f);
1156 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1157}
1158EXPORT_SYMBOL(transport_set_vpd_ident_type);
1159
1160int transport_dump_vpd_ident(
1161 struct t10_vpd *vpd,
1162 unsigned char *p_buf,
1163 int p_buf_len)
1164{
1165 unsigned char buf[VPD_TMP_BUF_SIZE];
1166 int ret = 0;
1167
1168 memset(buf, 0, VPD_TMP_BUF_SIZE);
1169
1170 switch (vpd->device_identifier_code_set) {
1171 case 0x01: /* Binary */
1172 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1173 &vpd->device_identifier[0]);
1174 break;
1175 case 0x02: /* ASCII */
1176 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1177 &vpd->device_identifier[0]);
1178 break;
1179 case 0x03: /* UTF-8 */
1180 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1181 &vpd->device_identifier[0]);
1182 break;
1183 default:
1184 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1185 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1186 ret = -EINVAL;
c66ac9db
NB		 1187 break;
1188 }
1189
1190 if (p_buf)
1191 strncpy(p_buf, buf, p_buf_len);
1192 else
6708bb27 1193 pr_debug("%s", buf);
c66ac9db
NB		 1194
1195 return ret;
1196}
1197
1198int
1199transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1200{
1201 static const char hex_str[] = "0123456789abcdef";
1202 int j = 0, i = 4; /* offset to start of the identifer */
1203
1204 /*
1205 * The VPD Code Set (encoding)
1206 *
1207 * from spc3r23.pdf Section 7.6.3.1 Table 296
1208 */
1209 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1210 switch (vpd->device_identifier_code_set) {
1211 case 0x01: /* Binary */
1212 vpd->device_identifier[j++] =
1213 hex_str[vpd->device_identifier_type];
1214 while (i < (4 + page_83[3])) {
1215 vpd->device_identifier[j++] =
1216 hex_str[(page_83[i] & 0xf0) >> 4];
1217 vpd->device_identifier[j++] =
1218 hex_str[page_83[i] & 0x0f];
1219 i++;
1220 }
1221 break;
1222 case 0x02: /* ASCII */
1223 case 0x03: /* UTF-8 */
1224 while (i < (4 + page_83[3]))
1225 vpd->device_identifier[j++] = page_83[i++];
1226 break;
1227 default:
1228 break;
1229 }
1230
1231 return transport_dump_vpd_ident(vpd, NULL, 0);
1232}
1233EXPORT_SYMBOL(transport_set_vpd_ident);
1234
1235static void core_setup_task_attr_emulation(struct se_device *dev)
1236{
1237 /*
1238 * If this device is from Target_Core_Mod/pSCSI, disable the
1239 * SAM Task Attribute emulation.
1240 *
1241 * This is currently not available in upsream Linux/SCSI Target
1242 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1243 */
e3d6f909 1244 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1245 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1246 return;
1247 }
1248
1249 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1250 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1251 " device\n", dev->transport->name,
1252 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1253}
1254
1255static void scsi_dump_inquiry(struct se_device *dev)
1256{
e3d6f909 1257 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1258 char buf[17];
c66ac9db
NB		 1259 int i, device_type;
1260 /*
1261 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1262 */
c66ac9db
NB		 1263 for (i = 0; i < 8; i++)
1264 if (wwn->vendor[i] >= 0x20)
e59a41b6 1265 buf[i] = wwn->vendor[i];
c66ac9db 1266 else
e59a41b6
SAS		 1267 buf[i] = ' ';
1268 buf[i] = '\0';
1269 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1270
c66ac9db
NB		 1271 for (i = 0; i < 16; i++)
1272 if (wwn->model[i] >= 0x20)
e59a41b6 1273 buf[i] = wwn->model[i];
c66ac9db 1274 else
e59a41b6
SAS		 1275 buf[i] = ' ';
1276 buf[i] = '\0';
1277 pr_debug(" Model: %s\n", buf);
c66ac9db 1278
c66ac9db
NB		 1279 for (i = 0; i < 4; i++)
1280 if (wwn->revision[i] >= 0x20)
e59a41b6 1281 buf[i] = wwn->revision[i];
c66ac9db 1282 else
e59a41b6
SAS		 1283 buf[i] = ' ';
1284 buf[i] = '\0';
1285 pr_debug(" Revision: %s\n", buf);
c66ac9db 1286
e3d6f909 1287 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1288 pr_debug(" Type: %s ", scsi_device_type(device_type));
1289 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1290 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1291}
1292
1293struct se_device *transport_add_device_to_core_hba(
1294 struct se_hba *hba,
1295 struct se_subsystem_api *transport,
1296 struct se_subsystem_dev *se_dev,
1297 u32 device_flags,
1298 void *transport_dev,
1299 struct se_dev_limits *dev_limits,
1300 const char *inquiry_prod,
1301 const char *inquiry_rev)
1302{
12a18bdc 1303 int force_pt;
c66ac9db
NB		 1304 struct se_device *dev;
1305
1306 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1307 if (!dev) {
1308 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1309 return NULL;
1310 }
c66ac9db 1311
e3d6f909 1312 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1313 dev->dev_flags = device_flags;
1314 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1315 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1316 dev->se_hba = hba;
1317 dev->se_sub_dev = se_dev;
1318 dev->transport = transport;
c66ac9db
NB		 1319 INIT_LIST_HEAD(&dev->dev_list);
1320 INIT_LIST_HEAD(&dev->dev_sep_list);
1321 INIT_LIST_HEAD(&dev->dev_tmr_list);
1322 INIT_LIST_HEAD(&dev->execute_task_list);
1323 INIT_LIST_HEAD(&dev->delayed_cmd_list);
c66ac9db 1324 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1325 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1326 spin_lock_init(&dev->execute_task_lock);
1327 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1328 spin_lock_init(&dev->dev_reservation_lock);
1329 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1330 spin_lock_init(&dev->se_port_lock);
1331 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1332 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1333 atomic_set(&dev->dev_ordered_id, 0);
1334
1335 se_dev_set_default_attribs(dev, dev_limits);
1336
1337 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1338 dev->creation_time = get_jiffies_64();
1339 spin_lock_init(&dev->stats_lock);
1340
1341 spin_lock(&hba->device_lock);
1342 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1343 hba->dev_count++;
1344 spin_unlock(&hba->device_lock);
1345 /*
1346 * Setup the SAM Task Attribute emulation for struct se_device
1347 */
1348 core_setup_task_attr_emulation(dev);
1349 /*
1350 * Force PR and ALUA passthrough emulation with internal object use.
1351 */
1352 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1353 /*
1354 * Setup the Reservations infrastructure for struct se_device
1355 */
1356 core_setup_reservations(dev, force_pt);
1357 /*
1358 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1359 */
1360 if (core_setup_alua(dev, force_pt) < 0)
1361 goto out;
1362
1363 /*
1364 * Startup the struct se_device processing thread
1365 */
1366 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1367 "LIO_%s", dev->transport->name);
c66ac9db 1368 if (IS_ERR(dev->process_thread)) {
6708bb27 1369 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1370 dev->transport->name);
c66ac9db
NB		 1371 goto out;
1372 }
07bde79a
NB		 1373 /*
1374 * Setup work_queue for QUEUE_FULL
1375 */
1376 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1377 /*
1378 * Preload the initial INQUIRY const values if we are doing
1379 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1380 * passthrough because this is being provided by the backend LLD.
1381 * This is required so that transport_get_inquiry() copies these
1382 * originals once back into DEV_T10_WWN(dev) for the virtual device
1383 * setup.
1384 */
e3d6f909 1385 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1386 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1387 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1388 " INQUIRY consts\n");
1389 goto out;
1390 }
1391
e3d6f909
AG		 1392 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1393 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1394 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1395 }
1396 scsi_dump_inquiry(dev);
1397
12a18bdc 1398 return dev;
c66ac9db 1399out:
c66ac9db
NB		 1400 kthread_stop(dev->process_thread);
1401
1402 spin_lock(&hba->device_lock);
1403 list_del(&dev->dev_list);
1404 hba->dev_count--;
1405 spin_unlock(&hba->device_lock);
1406
1407 se_release_vpd_for_dev(dev);
1408
c66ac9db
NB		 1409 kfree(dev);
1410
1411 return NULL;
1412}
1413EXPORT_SYMBOL(transport_add_device_to_core_hba);
1414
1415/* transport_generic_prepare_cdb():
1416 *
1417 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1418 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1419 * The point of this is since we are mapping iSCSI LUNs to
1420 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1421 * devices and HBAs for a loop.
1422 */
1423static inline void transport_generic_prepare_cdb(
1424 unsigned char *cdb)
1425{
1426 switch (cdb[0]) {
1427 case READ_10: /* SBC - RDProtect */
1428 case READ_12: /* SBC - RDProtect */
1429 case READ_16: /* SBC - RDProtect */
1430 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1431 case VERIFY: /* SBC - VRProtect */
1432 case VERIFY_16: /* SBC - VRProtect */
1433 case WRITE_VERIFY: /* SBC - VRProtect */
1434 case WRITE_VERIFY_12: /* SBC - VRProtect */
1435 break;
1436 default:
1437 cdb[1] &= 0x1f; /* clear logical unit number */
1438 break;
1439 }
1440}
1441
1442static struct se_task *
1443transport_generic_get_task(struct se_cmd *cmd,
1444 enum dma_data_direction data_direction)
1445{
1446 struct se_task *task;
5951146d 1447 struct se_device *dev = cmd->se_dev;
c66ac9db 1448
6708bb27 1449 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1450 if (!task) {
6708bb27 1451 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1452 return NULL;
1453 }
1454
1455 INIT_LIST_HEAD(&task->t_list);
1456 INIT_LIST_HEAD(&task->t_execute_list);
1457 INIT_LIST_HEAD(&task->t_state_list);
1458 init_completion(&task->task_stop_comp);
c66ac9db 1459 task->task_se_cmd = cmd;
c66ac9db
NB		 1460 task->task_data_direction = data_direction;
1461
c66ac9db
NB		 1462 return task;
1463}
1464
1465static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1466
c66ac9db
NB		 1467/*
1468 * Used by fabric modules containing a local struct se_cmd within their
1469 * fabric dependent per I/O descriptor.
1470 */
1471void transport_init_se_cmd(
1472 struct se_cmd *cmd,
1473 struct target_core_fabric_ops *tfo,
1474 struct se_session *se_sess,
1475 u32 data_length,
1476 int data_direction,
1477 int task_attr,
1478 unsigned char *sense_buffer)
1479{
5951146d
AG		 1480 INIT_LIST_HEAD(&cmd->se_lun_node);
1481 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1482 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1483 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1484 INIT_LIST_HEAD(&cmd->se_cmd_list);
a1d8b49a
AG		 1485 INIT_LIST_HEAD(&cmd->t_task_list);
1486 init_completion(&cmd->transport_lun_fe_stop_comp);
1487 init_completion(&cmd->transport_lun_stop_comp);
1488 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1489 init_completion(&cmd->cmd_wait_comp);
a1d8b49a
AG		 1490 spin_lock_init(&cmd->t_state_lock);
1491 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1492
1493 cmd->se_tfo = tfo;
1494 cmd->se_sess = se_sess;
1495 cmd->data_length = data_length;
1496 cmd->data_direction = data_direction;
1497 cmd->sam_task_attr = task_attr;
1498 cmd->sense_buffer = sense_buffer;
1499}
1500EXPORT_SYMBOL(transport_init_se_cmd);
1501
1502static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1503{
1504 /*
1505 * Check if SAM Task Attribute emulation is enabled for this
1506 * struct se_device storage object
1507 */
5951146d 1508 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1509 return 0;
1510
e66ecd50 1511 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1512 pr_debug("SAM Task Attribute ACA"
c66ac9db 1513 " emulation is not supported\n");
e3d6f909 1514 return -EINVAL;
c66ac9db
NB		 1515 }
1516 /*
1517 * Used to determine when ORDERED commands should go from
1518 * Dormant to Active status.
1519 */
5951146d 1520 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1521 smp_mb__after_atomic_inc();
6708bb27 1522 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1523 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1524 cmd->se_dev->transport->name);
c66ac9db
NB		 1525 return 0;
1526}
1527
c66ac9db
NB		 1528/* transport_generic_allocate_tasks():
1529 *
1530 * Called from fabric RX Thread.
1531 */
1532int transport_generic_allocate_tasks(
1533 struct se_cmd *cmd,
1534 unsigned char *cdb)
1535{
1536 int ret;
1537
1538 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1539 /*
1540 * Ensure that the received CDB is less than the max (252 + 8) bytes
1541 * for VARIABLE_LENGTH_CMD
1542 */
1543 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1544 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1545 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1546 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1547 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1548 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1549 return -EINVAL;
c66ac9db
NB		 1550 }
1551 /*
1552 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1553 * allocate the additional extended CDB buffer now.. Otherwise
1554 * setup the pointer from __t_task_cdb to t_task_cdb.
1555 */
a1d8b49a
AG		 1556 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1557 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1558 GFP_KERNEL);
6708bb27
AG		 1559 if (!cmd->t_task_cdb) {
1560 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1561 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1562 scsi_command_size(cdb),
a1d8b49a 1563 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1564 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1565 cmd->scsi_sense_reason =
1566 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1567 return -ENOMEM;
c66ac9db
NB		 1568 }
1569 } else
a1d8b49a 1570 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1571 /*
a1d8b49a 1572 * Copy the original CDB into cmd->
c66ac9db 1573 */
a1d8b49a 1574 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1575 /*
1576 * Setup the received CDB based on SCSI defined opcodes and
1577 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1578 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1579 * pointer is expected to be setup before we reach this point.
1580 */
1581 ret = transport_generic_cmd_sequencer(cmd, cdb);
1582 if (ret < 0)
1583 return ret;
1584 /*
1585 * Check for SAM Task Attribute Emulation
1586 */
1587 if (transport_check_alloc_task_attr(cmd) < 0) {
1588 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1589 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1590 return -EINVAL;
c66ac9db
NB		 1591 }
1592 spin_lock(&cmd->se_lun->lun_sep_lock);
1593 if (cmd->se_lun->lun_sep)
1594 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1595 spin_unlock(&cmd->se_lun->lun_sep_lock);
1596 return 0;
1597}
1598EXPORT_SYMBOL(transport_generic_allocate_tasks);
1599
695434e1
NB		 1600/*
1601 * Used by fabric module frontends to queue tasks directly.
1602 * Many only be used from process context only
1603 */
1604int transport_handle_cdb_direct(
1605 struct se_cmd *cmd)
1606{
dd8ae59d
NB		 1607 int ret;
1608
695434e1
NB		 1609 if (!cmd->se_lun) {
1610 dump_stack();
6708bb27 1611 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1612 return -EINVAL;
1613 }
1614 if (in_interrupt()) {
1615 dump_stack();
6708bb27 1616 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1617 " from interrupt context\n");
1618 return -EINVAL;
1619 }
dd8ae59d
NB		 1620 /*
1621 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1622 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1623 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1624 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1625 *
1626 * Also, we don't take cmd->t_state_lock here as we only expect
1627 * this to be called for initial descriptor submission.
1628 */
1629 cmd->t_state = TRANSPORT_NEW_CMD;
1630 atomic_set(&cmd->t_transport_active, 1);
1631 /*
1632 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1633 * so follow TRANSPORT_NEW_CMD processing thread context usage
1634 * and call transport_generic_request_failure() if necessary..
1635 */
1636 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1637 if (ret < 0)
1638 transport_generic_request_failure(cmd);
1639
dd8ae59d 1640 return 0;
695434e1
NB		 1641}
1642EXPORT_SYMBOL(transport_handle_cdb_direct);
1643
a6360785
NB		 1644/**
1645 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1646 *
1647 * @se_cmd: command descriptor to submit
1648 * @se_sess: associated se_sess for endpoint
1649 * @cdb: pointer to SCSI CDB
1650 * @sense: pointer to SCSI sense buffer
1651 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1652 * @data_length: fabric expected data transfer length
1653 * @task_addr: SAM task attribute
1654 * @data_dir: DMA data direction
1655 * @flags: flags for command submission from target_sc_flags_tables
1656 *
1657 * This may only be called from process context, and also currently
1658 * assumes internal allocation of fabric payload buffer by target-core.
1659 **/
1edcdb49 1660void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1661 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1662 u32 data_length, int task_attr, int data_dir, int flags)
1663{
1664 struct se_portal_group *se_tpg;
1665 int rc;
1666
1667 se_tpg = se_sess->se_tpg;
1668 BUG_ON(!se_tpg);
1669 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1670 BUG_ON(in_interrupt());
1671 /*
1672 * Initialize se_cmd for target operation. From this point
1673 * exceptions are handled by sending exception status via
1674 * target_core_fabric_ops->queue_status() callback
1675 */
1676 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1677 data_length, data_dir, task_attr, sense);
1678 /*
1679 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1680 * se_sess->sess_cmd_list. A second kref_get here is necessary
1681 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1682 * kref_put() to happen during fabric packet acknowledgement.
1683 */
1684 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1685 /*
1686 * Signal bidirectional data payloads to target-core
1687 */
1688 if (flags & TARGET_SCF_BIDI_OP)
1689 se_cmd->se_cmd_flags |= SCF_BIDI;
1690 /*
1691 * Locate se_lun pointer and attach it to struct se_cmd
1692 */
735703ca
NB		 1693 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1694 transport_send_check_condition_and_sense(se_cmd,
1695 se_cmd->scsi_sense_reason, 0);
1696 target_put_sess_cmd(se_sess, se_cmd);
1697 return;
1698 }
a6360785
NB		 1699 /*
1700 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1701 * allocate the necessary tasks to complete the received CDB+data
1702 */
1703 rc = transport_generic_allocate_tasks(se_cmd, cdb);
735703ca
NB		 1704 if (rc != 0) {
1705 transport_generic_request_failure(se_cmd);
1706 return;
1707 }
a6360785
NB		 1708 /*
1709 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1710 * for immediate execution of READs, otherwise wait for
1711 * transport_generic_handle_data() to be called for WRITEs
1712 * when fabric has filled the incoming buffer.
1713 */
1714 transport_handle_cdb_direct(se_cmd);
1edcdb49 1715 return;
a6360785
NB		 1716}
1717EXPORT_SYMBOL(target_submit_cmd);
1718
c66ac9db
NB		 1719/*
1720 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1721 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1722 * complete setup in TCM process context w/ TFO->new_cmd_map().
1723 */
1724int transport_generic_handle_cdb_map(
1725 struct se_cmd *cmd)
1726{
e3d6f909 1727 if (!cmd->se_lun) {
c66ac9db 1728 dump_stack();
6708bb27 1729 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1730 return -EINVAL;
c66ac9db
NB		 1731 }
1732
f7a5cc0b 1733 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1734 return 0;
1735}
1736EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1737
1738/* transport_generic_handle_data():
1739 *
1740 *
1741 */
1742int transport_generic_handle_data(
1743 struct se_cmd *cmd)
1744{
1745 /*
1746 * For the software fabric case, then we assume the nexus is being
1747 * failed/shutdown when signals are pending from the kthread context
1748 * caller, so we return a failure. For the HW target mode case running
1749 * in interrupt code, the signal_pending() check is skipped.
1750 */
1751 if (!in_interrupt() && signal_pending(current))
e3d6f909 1752 return -EPERM;
c66ac9db
NB		 1753 /*
1754 * If the received CDB has aleady been ABORTED by the generic
1755 * target engine, we now call transport_check_aborted_status()
1756 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1757 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1758 * sequences at this point.
1759 */
1760 if (transport_check_aborted_status(cmd, 1) != 0)
1761 return 0;
1762
f7a5cc0b 1763 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1764 return 0;
1765}
1766EXPORT_SYMBOL(transport_generic_handle_data);
1767
1768/* transport_generic_handle_tmr():
1769 *
1770 *
1771 */
1772int transport_generic_handle_tmr(
1773 struct se_cmd *cmd)
1774{
f7a5cc0b 1775 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1776 return 0;
1777}
1778EXPORT_SYMBOL(transport_generic_handle_tmr);
1779
cdbb70bb
CH		 1780/*
1781 * If the task is active, request it to be stopped and sleep until it
1782 * has completed.
1783 */
1784bool target_stop_task(struct se_task *task, unsigned long *flags)
1785{
1786 struct se_cmd *cmd = task->task_se_cmd;
1787 bool was_active = false;
1788
1789 if (task->task_flags & TF_ACTIVE) {
1790 task->task_flags |= TF_REQUEST_STOP;
1791 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1792
1793 pr_debug("Task %p waiting to complete\n", task);
1794 wait_for_completion(&task->task_stop_comp);
1795 pr_debug("Task %p stopped successfully\n", task);
1796
1797 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1798 atomic_dec(&cmd->t_task_cdbs_left);
1799 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1800 was_active = true;
1801 }
1802
cdbb70bb
CH		 1803 return was_active;
1804}
1805
c66ac9db
NB		 1806static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1807{
1808 struct se_task *task, *task_tmp;
1809 unsigned long flags;
1810 int ret = 0;
1811
6708bb27 1812 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1813 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1814
1815 /*
1816 * No tasks remain in the execution queue
1817 */
a1d8b49a 1818 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1819 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1820 &cmd->t_task_list, t_list) {
04629b7b 1821 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1822 /*
1823 * If the struct se_task has not been sent and is not active,
1824 * remove the struct se_task from the execution queue.
1825 */
6c76bf95 1826 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1827 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1828 flags);
1829 transport_remove_task_from_execute_queue(task,
42bf829e 1830 cmd->se_dev);
c66ac9db 1831
04629b7b 1832 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1833 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1834 continue;
1835 }
1836
cdbb70bb 1837 if (!target_stop_task(task, &flags)) {
04629b7b 1838 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1839 ret++;
1840 }
c66ac9db 1841 }
a1d8b49a 1842 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1843
1844 return ret;
1845}
1846
c66ac9db
NB		 1847/*
1848 * Handle SAM-esque emulation for generic transport request failures.
1849 */
03e98c9e 1850static void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1851{
07bde79a
NB		 1852 int ret = 0;
1853
6708bb27 1854 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1855 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1856 cmd->t_task_cdb[0]);
03e98c9e 1857 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1858 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1859 cmd->t_state, cmd->scsi_sense_reason);
6708bb27 1860 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1861 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1862 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1863 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1864 atomic_read(&cmd->t_task_cdbs_left),
1865 atomic_read(&cmd->t_task_cdbs_sent),
1866 atomic_read(&cmd->t_task_cdbs_ex_left),
1867 atomic_read(&cmd->t_transport_active),
1868 atomic_read(&cmd->t_transport_stop),
1869 atomic_read(&cmd->t_transport_sent));
c66ac9db 1870
c66ac9db
NB		 1871 /*
1872 * For SAM Task Attribute emulation for failed struct se_cmd
1873 */
1874 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1875 transport_complete_task_attr(cmd);
1876
03e98c9e
NB		 1877 switch (cmd->scsi_sense_reason) {
1878 case TCM_NON_EXISTENT_LUN:
1879 case TCM_UNSUPPORTED_SCSI_OPCODE:
1880 case TCM_INVALID_CDB_FIELD:
1881 case TCM_INVALID_PARAMETER_LIST:
1882 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1883 case TCM_UNKNOWN_MODE_PAGE:
1884 case TCM_WRITE_PROTECTED:
1885 case TCM_CHECK_CONDITION_ABORT_CMD:
1886 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1887 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1888 break;
03e98c9e 1889 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1890 /*
1891 * No SENSE Data payload for this case, set SCSI Status
1892 * and queue the response to $FABRIC_MOD.
1893 *
1894 * Uses linux/include/scsi/scsi.h SAM status codes defs
1895 */
1896 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1897 /*
1898 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1899 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1900 * CONFLICT STATUS.
1901 *
1902 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1903 */
e3d6f909
AG		 1904 if (cmd->se_sess &&
1905 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1906 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1907 cmd->orig_fe_lun, 0x2C,
1908 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1909
07bde79a 1910 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1911 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1912 goto queue_full;
c66ac9db 1913 goto check_stop;
c66ac9db 1914 default:
6708bb27 1915 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1916 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1917 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1918 break;
1919 }
16ab8e60
NB		 1920 /*
1921 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1922 * make the call to transport_send_check_condition_and_sense()
1923 * directly. Otherwise expect the fabric to make the call to
1924 * transport_send_check_condition_and_sense() after handling
1925 * possible unsoliticied write data payloads.
1926 */
03e98c9e
NB		 1927 ret = transport_send_check_condition_and_sense(cmd,
1928 cmd->scsi_sense_reason, 0);
1929 if (ret == -EAGAIN || ret == -ENOMEM)
1930 goto queue_full;
07bde79a 1931
c66ac9db
NB		 1932check_stop:
1933 transport_lun_remove_cmd(cmd);
6708bb27 1934 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1935 ;
07bde79a
NB		 1936 return;
1937
1938queue_full:
e057f533
CH		 1939 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1940 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1941}
1942
c66ac9db
NB		 1943static inline u32 transport_lba_21(unsigned char *cdb)
1944{
1945 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1946}
1947
1948static inline u32 transport_lba_32(unsigned char *cdb)
1949{
1950 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1951}
1952
1953static inline unsigned long long transport_lba_64(unsigned char *cdb)
1954{
1955 unsigned int __v1, __v2;
1956
1957 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1958 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1959
1960 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1961}
1962
1963/*
1964 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1965 */
1966static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1967{
1968 unsigned int __v1, __v2;
1969
1970 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1971 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1972
1973 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1974}
1975
1976static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1977{
1978 unsigned long flags;
1979
a1d8b49a 1980 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 1981 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 1982 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 1983}
1984
c66ac9db
NB		 1985/*
1986 * Called from Fabric Module context from transport_execute_tasks()
1987 *
1988 * The return of this function determins if the tasks from struct se_cmd
1989 * get added to the execution queue in transport_execute_tasks(),
1990 * or are added to the delayed or ordered lists here.
1991 */
1992static inline int transport_execute_task_attr(struct se_cmd *cmd)
1993{
5951146d 1994 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1995 return 1;
1996 /*
25985edc 1997 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1998 * to allow the passed struct se_cmd list of tasks to the front of the list.
1999 */
e66ecd50 2000 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
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 2007 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2008 smp_mb__after_atomic_inc();
2009
6708bb27 2010 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2011 " list, se_ordered_id: %u\n",
a1d8b49a 2012 cmd->t_task_cdb[0],
c66ac9db
NB		 2013 cmd->se_ordered_id);
2014 /*
2015 * Add ORDERED command to tail of execution queue if
2016 * no other older commands exist that need to be
2017 * completed first.
2018 */
6708bb27 2019 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2020 return 1;
2021 } else {
2022 /*
2023 * For SIMPLE and UNTAGGED Task Attribute commands
2024 */
5951146d 2025 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2026 smp_mb__after_atomic_inc();
2027 }
2028 /*
2029 * Otherwise if one or more outstanding ORDERED task attribute exist,
2030 * add the dormant task(s) built for the passed struct se_cmd to the
2031 * execution queue and become in Active state for this struct se_device.
2032 */
5951146d 2033 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2034 /*
2035 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2036 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2037 */
5951146d 2038 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2039 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2040 list_add_tail(&cmd->se_delayed_node,
2041 &cmd->se_dev->delayed_cmd_list);
2042 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2043
6708bb27 2044 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2045 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2046 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2047 cmd->se_ordered_id);
2048 /*
2049 * Return zero to let transport_execute_tasks() know
2050 * not to add the delayed tasks to the execution list.
2051 */
2052 return 0;
2053 }
2054 /*
2055 * Otherwise, no ORDERED task attributes exist..
2056 */
2057 return 1;
2058}
2059
2060/*
2061 * Called from fabric module context in transport_generic_new_cmd() and
2062 * transport_generic_process_write()
2063 */
2064static int transport_execute_tasks(struct se_cmd *cmd)
2065{
2066 int add_tasks;
40be67f4 2067 struct se_device *se_dev = cmd->se_dev;
c66ac9db
NB		 2068 /*
2069 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2070 * has occurred that prevents execution.
c66ac9db 2071 */
6708bb27 2072 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2073 /*
2074 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2075 * attribute for the tasks of the received struct se_cmd CDB
2076 */
2077 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2078 if (!add_tasks)
c66ac9db
NB		 2079 goto execute_tasks;
2080 /*
4d2300cc
NB		 2081 * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2082 * adds associated se_tasks while holding dev->execute_task_lock
2083 * before I/O dispath to avoid a double spinlock access.
c66ac9db 2084 */
4d2300cc
NB		 2085 __transport_execute_tasks(se_dev, cmd);
2086 return 0;
c66ac9db 2087 }
4d2300cc 2088
c66ac9db 2089execute_tasks:
4d2300cc 2090 __transport_execute_tasks(se_dev, NULL);
c66ac9db
NB		 2091 return 0;
2092}
2093
2094/*
2095 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2096 * from struct se_device->execute_task_list and
2097 *
2098 * Called from transport_processing_thread()
2099 */
4d2300cc 2100static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
c66ac9db
NB		 2101{
2102 int error;
2103 struct se_cmd *cmd = NULL;
e3d6f909 2104 struct se_task *task = NULL;
c66ac9db
NB		 2105 unsigned long flags;
2106
c66ac9db 2107check_depth:
e3d6f909 2108 spin_lock_irq(&dev->execute_task_lock);
4d2300cc
NB		 2109 if (new_cmd != NULL)
2110 __transport_add_tasks_from_cmd(new_cmd);
2111
e3d6f909
AG		 2112 if (list_empty(&dev->execute_task_list)) {
2113 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2114 return 0;
2115 }
e3d6f909
AG		 2116 task = list_first_entry(&dev->execute_task_list,
2117 struct se_task, t_execute_list);
04629b7b 2118 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2119 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db 2120
e3d6f909 2121 cmd = task->task_se_cmd;
a1d8b49a 2122 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2123 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2124 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2125
a1d8b49a
AG		 2126 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2127 cmd->t_task_list_num)
415a090a 2128 atomic_set(&cmd->t_transport_sent, 1);
c66ac9db 2129
a1d8b49a 2130 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2131
5bda90c8
CH		 2132 if (cmd->execute_task)
2133 error = cmd->execute_task(task);
2134 else
2135 error = dev->transport->do_task(task);
d29a5b6a 2136 if (error != 0) {
d29a5b6a
CH		 2137 spin_lock_irqsave(&cmd->t_state_lock, flags);
2138 task->task_flags &= ~TF_ACTIVE;
2139 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2140 atomic_set(&cmd->t_transport_sent, 0);
2141 transport_stop_tasks_for_cmd(cmd);
03e98c9e 2142 transport_generic_request_failure(cmd);
c66ac9db
NB		 2143 }
2144
4d2300cc 2145 new_cmd = NULL;
c66ac9db
NB		 2146 goto check_depth;
2147
2148 return 0;
2149}
2150
c66ac9db
NB		 2151static inline u32 transport_get_sectors_6(
2152 unsigned char *cdb,
2153 struct se_cmd *cmd,
2154 int *ret)
2155{
5951146d 2156 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2157
2158 /*
2159 * Assume TYPE_DISK for non struct se_device objects.
2160 * Use 8-bit sector value.
2161 */
2162 if (!dev)
2163 goto type_disk;
2164
2165 /*
2166 * Use 24-bit allocation length for TYPE_TAPE.
2167 */
e3d6f909 2168 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2169 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2170
2171 /*
2172 * Everything else assume TYPE_DISK Sector CDB location.
9b5cd7f3
RD		 2173 * Use 8-bit sector value. SBC-3 says:
2174 *
2175 * A TRANSFER LENGTH field set to zero specifies that 256
2176 * logical blocks shall be written. Any other value
2177 * specifies the number of logical blocks that shall be
2178 * written.
c66ac9db
NB		 2179 */
2180type_disk:
9b5cd7f3 2181 return cdb[4] ? : 256;
c66ac9db
NB		 2182}
2183
2184static inline u32 transport_get_sectors_10(
2185 unsigned char *cdb,
2186 struct se_cmd *cmd,
2187 int *ret)
2188{
5951146d 2189 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2190
2191 /*
2192 * Assume TYPE_DISK for non struct se_device objects.
2193 * Use 16-bit sector value.
2194 */
2195 if (!dev)
2196 goto type_disk;
2197
2198 /*
2199 * XXX_10 is not defined in SSC, throw an exception
2200 */
e3d6f909
AG		 2201 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2202 *ret = -EINVAL;
c66ac9db
NB		 2203 return 0;
2204 }
2205
2206 /*
2207 * Everything else assume TYPE_DISK Sector CDB location.
2208 * Use 16-bit sector value.
2209 */
2210type_disk:
2211 return (u32)(cdb[7] << 8) + cdb[8];
2212}
2213
2214static inline u32 transport_get_sectors_12(
2215 unsigned char *cdb,
2216 struct se_cmd *cmd,
2217 int *ret)
2218{
5951146d 2219 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2220
2221 /*
2222 * Assume TYPE_DISK for non struct se_device objects.
2223 * Use 32-bit sector value.
2224 */
2225 if (!dev)
2226 goto type_disk;
2227
2228 /*
2229 * XXX_12 is not defined in SSC, throw an exception
2230 */
e3d6f909
AG		 2231 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2232 *ret = -EINVAL;
c66ac9db
NB		 2233 return 0;
2234 }
2235
2236 /*
2237 * Everything else assume TYPE_DISK Sector CDB location.
2238 * Use 32-bit sector value.
2239 */
2240type_disk:
2241 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2242}
2243
2244static inline u32 transport_get_sectors_16(
2245 unsigned char *cdb,
2246 struct se_cmd *cmd,
2247 int *ret)
2248{
5951146d 2249 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2250
2251 /*
2252 * Assume TYPE_DISK for non struct se_device objects.
2253 * Use 32-bit sector value.
2254 */
2255 if (!dev)
2256 goto type_disk;
2257
2258 /*
2259 * Use 24-bit allocation length for TYPE_TAPE.
2260 */
e3d6f909 2261 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2262 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2263
2264type_disk:
2265 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2266 (cdb[12] << 8) + cdb[13];
2267}
2268
2269/*
2270 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2271 */
2272static inline u32 transport_get_sectors_32(
2273 unsigned char *cdb,
2274 struct se_cmd *cmd,
2275 int *ret)
2276{
2277 /*
2278 * Assume TYPE_DISK for non struct se_device objects.
2279 * Use 32-bit sector value.
2280 */
2281 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2282 (cdb[30] << 8) + cdb[31];
2283
2284}
2285
2286static inline u32 transport_get_size(
2287 u32 sectors,
2288 unsigned char *cdb,
2289 struct se_cmd *cmd)
2290{
5951146d 2291 struct se_device *dev = cmd->se_dev;
c66ac9db 2292
e3d6f909 2293 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2294 if (cdb[1] & 1) { /* sectors */
e3d6f909 2295 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2296 } else /* bytes */
2297 return sectors;
2298 }
2299#if 0
6708bb27 2300 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2301 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2302 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2303 dev->transport->name);
c66ac9db 2304#endif
e3d6f909 2305 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2306}
2307
c66ac9db
NB		 2308static void transport_xor_callback(struct se_cmd *cmd)
2309{
2310 unsigned char *buf, *addr;
ec98f782 2311 struct scatterlist *sg;
c66ac9db
NB		 2312 unsigned int offset;
2313 int i;
ec98f782 2314 int count;
c66ac9db
NB		 2315 /*
2316 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2317 *
2318 * 1) read the specified logical block(s);
2319 * 2) transfer logical blocks from the data-out buffer;
2320 * 3) XOR the logical blocks transferred from the data-out buffer with
2321 * the logical blocks read, storing the resulting XOR data in a buffer;
2322 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2323 * blocks transferred from the data-out buffer; and
2324 * 5) transfer the resulting XOR data to the data-in buffer.
2325 */
2326 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2327 if (!buf) {
2328 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2329 return;
2330 }
2331 /*
ec98f782 2332 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2333 * into the locally allocated *buf
2334 */
ec98f782
AG		 2335 sg_copy_to_buffer(cmd->t_data_sg,
2336 cmd->t_data_nents,
2337 buf,
2338 cmd->data_length);
2339
c66ac9db
NB		 2340 /*
2341 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2342 * cmd->t_mem_bidi_list
c66ac9db
NB		 2343 */
2344
2345 offset = 0;
ec98f782
AG		 2346 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2347 addr = kmap_atomic(sg_page(sg), KM_USER0);
2348 if (!addr)
c66ac9db
NB		 2349 goto out;
2350
ec98f782
AG		 2351 for (i = 0; i < sg->length; i++)
2352 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2353
ec98f782 2354 offset += sg->length;
c66ac9db
NB		 2355 kunmap_atomic(addr, KM_USER0);
2356 }
ec98f782 2357
c66ac9db
NB		 2358out:
2359 kfree(buf);
2360}
2361
2362/*
2363 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2364 */
2365static int transport_get_sense_data(struct se_cmd *cmd)
2366{
2367 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2368 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2369 struct se_task *task = NULL, *task_tmp;
2370 unsigned long flags;
2371 u32 offset = 0;
2372
e3d6f909
AG		 2373 WARN_ON(!cmd->se_lun);
2374
42bf829e
CH		 2375 if (!dev)
2376 return 0;
2377
a1d8b49a 2378 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2379 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2380 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2381 return 0;
2382 }
2383
2384 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2385 &cmd->t_task_list, t_list) {
ef804a84 2386 if (!(task->task_flags & TF_HAS_SENSE))
c66ac9db
NB		 2387 continue;
2388
e3d6f909 2389 if (!dev->transport->get_sense_buffer) {
6708bb27 2390 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2391 " is NULL\n");
2392 continue;
2393 }
2394
e3d6f909 2395 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2396 if (!sense_buffer) {
04629b7b 2397 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2398 " sense buffer for task with sense\n",
04629b7b 2399 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2400 continue;
2401 }
a1d8b49a 2402 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2403
e3d6f909 2404 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2405 TRANSPORT_SENSE_BUFFER);
2406
5951146d 2407 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2408 TRANSPORT_SENSE_BUFFER);
2409 cmd->scsi_status = task->task_scsi_status;
2410 /* Automatically padded */
2411 cmd->scsi_sense_length =
2412 (TRANSPORT_SENSE_BUFFER + offset);
2413
6708bb27 2414 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2415 " and sense\n",
e3d6f909 2416 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2417 cmd->scsi_status);
2418 return 0;
2419 }
a1d8b49a 2420 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2421
2422 return -1;
2423}
2424
ec98f782
AG		 2425static inline long long transport_dev_end_lba(struct se_device *dev)
2426{
2427 return dev->transport->get_blocks(dev) + 1;
2428}
2429
2430static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2431{
2432 struct se_device *dev = cmd->se_dev;
2433 u32 sectors;
2434
2435 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2436 return 0;
2437
2438 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2439
6708bb27
AG		 2440 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2441 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2442 " transport_dev_end_lba(): %llu\n",
2443 cmd->t_task_lba, sectors,
2444 transport_dev_end_lba(dev));
7abbe7f3 2445 return -EINVAL;
ec98f782
AG		 2446 }
2447
7abbe7f3 2448 return 0;
ec98f782
AG		 2449}
2450
706d5860
NB		 2451static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2452{
2453 /*
2454 * Determine if the received WRITE_SAME is used to for direct
2455 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2456 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2457 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2458 */
2459 int passthrough = (dev->transport->transport_type ==
2460 TRANSPORT_PLUGIN_PHBA_PDEV);
2461
2462 if (!passthrough) {
2463 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2464 pr_err("WRITE_SAME PBDATA and LBDATA"
2465 " bits not supported for Block Discard"
2466 " Emulation\n");
2467 return -ENOSYS;
2468 }
2469 /*
2470 * Currently for the emulated case we only accept
2471 * tpws with the UNMAP=1 bit set.
2472 */
2473 if (!(flags[0] & 0x08)) {
2474 pr_err("WRITE_SAME w/o UNMAP bit not"
2475 " supported for Block Discard Emulation\n");
2476 return -ENOSYS;
2477 }
2478 }
2479
2480 return 0;
2481}
2482
c66ac9db
NB		 2483/* transport_generic_cmd_sequencer():
2484 *
2485 * Generic Command Sequencer that should work for most DAS transport
2486 * drivers.
2487 *
2488 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2489 * RX Thread.
2490 *
2491 * FIXME: Need to support other SCSI OPCODES where as well.
2492 */
2493static int transport_generic_cmd_sequencer(
2494 struct se_cmd *cmd,
2495 unsigned char *cdb)
2496{
5951146d 2497 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2498 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2499 int ret = 0, sector_ret = 0, passthrough;
2500 u32 sectors = 0, size = 0, pr_reg_type = 0;
2501 u16 service_action;
2502 u8 alua_ascq = 0;
2503 /*
2504 * Check for an existing UNIT ATTENTION condition
2505 */
2506 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2507 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2508 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2509 return -EINVAL;
c66ac9db
NB		 2510 }
2511 /*
2512 * Check status of Asymmetric Logical Unit Assignment port
2513 */
e3d6f909 2514 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2515 if (ret != 0) {
c66ac9db 2516 /*
25985edc 2517 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2518 * The ALUA additional sense code qualifier (ASCQ) is determined
2519 * by the ALUA primary or secondary access state..
2520 */
2521 if (ret > 0) {
2522#if 0
6708bb27 2523 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2524 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2525 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2526#endif
2527 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2528 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2529 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2530 return -EINVAL;
c66ac9db
NB		 2531 }
2532 goto out_invalid_cdb_field;
2533 }
2534 /*
2535 * Check status for SPC-3 Persistent Reservations
2536 */
e3d6f909
AG		 2537 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2538 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2539 cmd, cdb, pr_reg_type) != 0) {
2540 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2541 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2542 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2543 return -EBUSY;
2544 }
c66ac9db
NB		 2545 /*
2546 * This means the CDB is allowed for the SCSI Initiator port
2547 * when said port is *NOT* holding the legacy SPC-2 or
2548 * SPC-3 Persistent Reservation.
2549 */
2550 }
2551
5bda90c8
CH		 2552 /*
2553 * If we operate in passthrough mode we skip most CDB emulation and
2554 * instead hand the commands down to the physical SCSI device.
2555 */
2556 passthrough =
2557 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2558
c66ac9db
NB		 2559 switch (cdb[0]) {
2560 case READ_6:
2561 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2562 if (sector_ret)
2563 goto out_unsupported_cdb;
2564 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2565 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2566 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2567 break;
2568 case READ_10:
2569 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2570 if (sector_ret)
2571 goto out_unsupported_cdb;
2572 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2573 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2574 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2575 break;
2576 case READ_12:
2577 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2578 if (sector_ret)
2579 goto out_unsupported_cdb;
2580 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2581 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2582 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2583 break;
2584 case READ_16:
2585 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2586 if (sector_ret)
2587 goto out_unsupported_cdb;
2588 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2589 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2590 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2591 break;
2592 case WRITE_6:
2593 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2594 if (sector_ret)
2595 goto out_unsupported_cdb;
2596 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2597 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2598 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2599 break;
2600 case WRITE_10:
2601 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2602 if (sector_ret)
2603 goto out_unsupported_cdb;
2604 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2605 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2606 if (cdb[1] & 0x8)
2607 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2608 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2609 break;
2610 case WRITE_12:
2611 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2612 if (sector_ret)
2613 goto out_unsupported_cdb;
2614 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2615 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2616 if (cdb[1] & 0x8)
2617 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2618 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2619 break;
2620 case WRITE_16:
2621 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2622 if (sector_ret)
2623 goto out_unsupported_cdb;
2624 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2625 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2626 if (cdb[1] & 0x8)
2627 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2628 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2629 break;
2630 case XDWRITEREAD_10:
2631 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2632 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2633 goto out_invalid_cdb_field;
2634 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2635 if (sector_ret)
2636 goto out_unsupported_cdb;
2637 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2638 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2639 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2640
5bda90c8
CH		 2641 /*
2642 * Do now allow BIDI commands for passthrough mode.
2643 */
2644 if (passthrough)
7c1c6af3 2645 goto out_unsupported_cdb;
5bda90c8 2646
c66ac9db 2647 /*
35e0e757 2648 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2649 */
2650 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2651 if (cdb[1] & 0x8)
2652 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2653 break;
2654 case VARIABLE_LENGTH_CMD:
2655 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2656 switch (service_action) {
2657 case XDWRITEREAD_32:
2658 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2659 if (sector_ret)
2660 goto out_unsupported_cdb;
2661 size = transport_get_size(sectors, cdb, cmd);
2662 /*
2663 * Use WRITE_32 and READ_32 opcodes for the emulated
2664 * XDWRITE_READ_32 logic.
2665 */
a1d8b49a 2666 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2667 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2668
5bda90c8
CH		 2669 /*
2670 * Do now allow BIDI commands for passthrough mode.
2671 */
c66ac9db 2672 if (passthrough)
7c1c6af3 2673 goto out_unsupported_cdb;
5bda90c8 2674
c66ac9db 2675 /*
35e0e757
CH		 2676 * Setup BIDI XOR callback to be run during after I/O
2677 * completion.
c66ac9db
NB		 2678 */
2679 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2680 if (cdb[1] & 0x8)
2681 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2682 break;
2683 case WRITE_SAME_32:
2684 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2685 if (sector_ret)
2686 goto out_unsupported_cdb;
dd3a5ad8 2687
6708bb27 2688 if (sectors)
12850626 2689 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2690 else {
2691 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2692 " supported\n");
2693 goto out_invalid_cdb_field;
2694 }
dd3a5ad8 2695
a1d8b49a 2696 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2697 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2698
706d5860 2699 if (target_check_write_same_discard(&cdb[10], dev) < 0)
67236c44 2700 goto out_unsupported_cdb;
5bda90c8
CH		 2701 if (!passthrough)
2702 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2703 break;
2704 default:
6708bb27 2705 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2706 " 0x%04x not supported\n", service_action);
2707 goto out_unsupported_cdb;
2708 }
2709 break;
e434f1f1 2710 case MAINTENANCE_IN:
e3d6f909 2711 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2712 /* MAINTENANCE_IN from SCC-2 */
2713 /*
2714 * Check for emulated MI_REPORT_TARGET_PGS.
2715 */
e76a35d6
CH		 2716 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2717 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2718 cmd->execute_task =
2719 target_emulate_report_target_port_groups;
c66ac9db
NB		 2720 }
2721 size = (cdb[6] << 24) | (cdb[7] << 16) |
2722 (cdb[8] << 8) | cdb[9];
2723 } else {
2724 /* GPCMD_SEND_KEY from multi media commands */
2725 size = (cdb[8] << 8) + cdb[9];
2726 }
05d1c7c0 2727 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2728 break;
2729 case MODE_SELECT:
2730 size = cdb[4];
2731 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2732 break;
2733 case MODE_SELECT_10:
2734 size = (cdb[7] << 8) + cdb[8];
2735 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2736 break;
2737 case MODE_SENSE:
2738 size = cdb[4];
05d1c7c0 2739 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2740 if (!passthrough)
2741 cmd->execute_task = target_emulate_modesense;
c66ac9db
NB		 2742 break;
2743 case MODE_SENSE_10:
5bda90c8
CH		 2744 size = (cdb[7] << 8) + cdb[8];
2745 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2746 if (!passthrough)
2747 cmd->execute_task = target_emulate_modesense;
2748 break;
c66ac9db
NB		 2749 case GPCMD_READ_BUFFER_CAPACITY:
2750 case GPCMD_SEND_OPC:
2751 case LOG_SELECT:
2752 case LOG_SENSE:
2753 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2754 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2755 break;
2756 case READ_BLOCK_LIMITS:
2757 size = READ_BLOCK_LEN;
05d1c7c0 2758 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2759 break;
2760 case GPCMD_GET_CONFIGURATION:
2761 case GPCMD_READ_FORMAT_CAPACITIES:
2762 case GPCMD_READ_DISC_INFO:
2763 case GPCMD_READ_TRACK_RZONE_INFO:
2764 size = (cdb[7] << 8) + cdb[8];
2765 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2766 break;
2767 case PERSISTENT_RESERVE_IN:
617c0e06 2768 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2769 cmd->execute_task = target_scsi3_emulate_pr_in;
617c0e06
CH		 2770 size = (cdb[7] << 8) + cdb[8];
2771 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2772 break;
c66ac9db 2773 case PERSISTENT_RESERVE_OUT:
617c0e06 2774 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2775 cmd->execute_task = target_scsi3_emulate_pr_out;
c66ac9db 2776 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2777 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2778 break;
2779 case GPCMD_MECHANISM_STATUS:
2780 case GPCMD_READ_DVD_STRUCTURE:
2781 size = (cdb[8] << 8) + cdb[9];
2782 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2783 break;
2784 case READ_POSITION:
2785 size = READ_POSITION_LEN;
05d1c7c0 2786 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2787 break;
e434f1f1 2788 case MAINTENANCE_OUT:
e3d6f909 2789 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2790 /* MAINTENANCE_OUT from SCC-2
2791 *
2792 * Check for emulated MO_SET_TARGET_PGS.
2793 */
e76a35d6
CH		 2794 if (cdb[1] == MO_SET_TARGET_PGS &&
2795 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2796 cmd->execute_task =
2797 target_emulate_set_target_port_groups;
c66ac9db
NB		 2798 }
2799
2800 size = (cdb[6] << 24) | (cdb[7] << 16) |
2801 (cdb[8] << 8) | cdb[9];
2802 } else {
2803 /* GPCMD_REPORT_KEY from multi media commands */
2804 size = (cdb[8] << 8) + cdb[9];
2805 }
05d1c7c0 2806 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2807 break;
2808 case INQUIRY:
2809 size = (cdb[3] << 8) + cdb[4];
2810 /*
2811 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2812 * See spc4r17 section 5.3
2813 */
5951146d 2814 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2815 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2816 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2817 if (!passthrough)
2818 cmd->execute_task = target_emulate_inquiry;
c66ac9db
NB		 2819 break;
2820 case READ_BUFFER:
2821 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2822 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2823 break;
2824 case READ_CAPACITY:
2825 size = READ_CAP_LEN;
05d1c7c0 2826 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2827 if (!passthrough)
2828 cmd->execute_task = target_emulate_readcapacity;
c66ac9db
NB		 2829 break;
2830 case READ_MEDIA_SERIAL_NUMBER:
2831 case SECURITY_PROTOCOL_IN:
2832 case SECURITY_PROTOCOL_OUT:
2833 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2834 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2835 break;
2836 case SERVICE_ACTION_IN:
5bda90c8
CH		 2837 switch (cmd->t_task_cdb[1] & 0x1f) {
2838 case SAI_READ_CAPACITY_16:
2839 if (!passthrough)
2840 cmd->execute_task =
2841 target_emulate_readcapacity_16;
2842 break;
2843 default:
2844 if (passthrough)
2845 break;
2846
2847 pr_err("Unsupported SA: 0x%02x\n",
2848 cmd->t_task_cdb[1] & 0x1f);
2849 goto out_unsupported_cdb;
2850 }
2851 /*FALLTHROUGH*/
c66ac9db
NB		 2852 case ACCESS_CONTROL_IN:
2853 case ACCESS_CONTROL_OUT:
2854 case EXTENDED_COPY:
2855 case READ_ATTRIBUTE:
2856 case RECEIVE_COPY_RESULTS:
2857 case WRITE_ATTRIBUTE:
2858 size = (cdb[10] << 24) | (cdb[11] << 16) |
2859 (cdb[12] << 8) | cdb[13];
05d1c7c0 2860 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2861 break;
2862 case RECEIVE_DIAGNOSTIC:
2863 case SEND_DIAGNOSTIC:
2864 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2865 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2866 break;
2867/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2868#if 0
2869 case GPCMD_READ_CD:
2870 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2871 size = (2336 * sectors);
05d1c7c0 2872 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2873 break;
2874#endif
2875 case READ_TOC:
2876 size = cdb[8];
05d1c7c0 2877 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2878 break;
2879 case REQUEST_SENSE:
2880 size = cdb[4];
05d1c7c0 2881 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2882 if (!passthrough)
2883 cmd->execute_task = target_emulate_request_sense;
c66ac9db
NB		 2884 break;
2885 case READ_ELEMENT_STATUS:
2886 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2887 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2888 break;
2889 case WRITE_BUFFER:
2890 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2891 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2892 break;
2893 case RESERVE:
2894 case RESERVE_10:
2895 /*
2896 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2897 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2898 */
2899 if (cdb[0] == RESERVE_10)
2900 size = (cdb[7] << 8) | cdb[8];
2901 else
2902 size = cmd->data_length;
2903
2904 /*
2905 * Setup the legacy emulated handler for SPC-2 and
2906 * >= SPC-3 compatible reservation handling (CRH=1)
2907 * Otherwise, we assume the underlying SCSI logic is
2908 * is running in SPC_PASSTHROUGH, and wants reservations
2909 * emulation disabled.
2910 */
e76a35d6
CH		 2911 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2912 cmd->execute_task = target_scsi2_reservation_reserve;
c66ac9db
NB		 2913 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2914 break;
2915 case RELEASE:
2916 case RELEASE_10:
2917 /*
2918 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2919 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2920 */
2921 if (cdb[0] == RELEASE_10)
2922 size = (cdb[7] << 8) | cdb[8];
2923 else
2924 size = cmd->data_length;
2925
e76a35d6
CH		 2926 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2927 cmd->execute_task = target_scsi2_reservation_release;
c66ac9db
NB		 2928 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2929 break;
2930 case SYNCHRONIZE_CACHE:
2931 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2932 /*
2933 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2934 */
2935 if (cdb[0] == SYNCHRONIZE_CACHE) {
2936 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2937 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2938 } else {
2939 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2940 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2941 }
2942 if (sector_ret)
2943 goto out_unsupported_cdb;
2944
2945 size = transport_get_size(sectors, cdb, cmd);
2946 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2947
5bda90c8 2948 if (passthrough)
c66ac9db 2949 break;
5bda90c8 2950
c66ac9db
NB		 2951 /*
2952 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 2953 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 2954 */
7abbe7f3
NB		 2955 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2956 if (transport_cmd_get_valid_sectors(cmd) < 0)
2957 goto out_invalid_cdb_field;
2958 }
5bda90c8 2959 cmd->execute_task = target_emulate_synchronize_cache;
c66ac9db
NB		 2960 break;
2961 case UNMAP:
2962 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 2963 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2964 if (!passthrough)
2965 cmd->execute_task = target_emulate_unmap;
c66ac9db
NB		 2966 break;
2967 case WRITE_SAME_16:
2968 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2969 if (sector_ret)
2970 goto out_unsupported_cdb;
dd3a5ad8 2971
6708bb27 2972 if (sectors)
12850626 2973 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2974 else {
2975 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2976 goto out_invalid_cdb_field;
2977 }
dd3a5ad8 2978
5db0753b 2979 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 2980 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2981
2982 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 2983 goto out_unsupported_cdb;
5bda90c8
CH		 2984 if (!passthrough)
2985 cmd->execute_task = target_emulate_write_same;
706d5860
NB		 2986 break;
2987 case WRITE_SAME:
2988 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2989 if (sector_ret)
2990 goto out_unsupported_cdb;
2991
2992 if (sectors)
12850626 2993 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 2994 else {
2995 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2996 goto out_invalid_cdb_field;
c66ac9db 2997 }
706d5860
NB		 2998
2999 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3000 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3001 /*
3002 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3003 * of byte 1 bit 3 UNMAP instead of original reserved field
3004 */
3005 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 3006 goto out_unsupported_cdb;
5bda90c8
CH		 3007 if (!passthrough)
3008 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 3009 break;
3010 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 3011 case ERASE:
c66ac9db
NB		 3012 case REZERO_UNIT:
3013 case SEEK_10:
c66ac9db
NB		 3014 case SPACE:
3015 case START_STOP:
3016 case TEST_UNIT_READY:
3017 case VERIFY:
3018 case WRITE_FILEMARKS:
5bda90c8
CH		 3019 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3020 if (!passthrough)
3021 cmd->execute_task = target_emulate_noop;
3022 break;
3023 case GPCMD_CLOSE_TRACK:
3024 case INITIALIZE_ELEMENT_STATUS:
3025 case GPCMD_LOAD_UNLOAD:
3026 case GPCMD_SET_SPEED:
c66ac9db
NB		 3027 case MOVE_MEDIUM:
3028 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3029 break;
3030 case REPORT_LUNS:
e76a35d6 3031 cmd->execute_task = target_report_luns;
c66ac9db
NB		 3032 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3033 /*
3034 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3035 * See spc4r17 section 5.3
3036 */
5951146d 3037 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3038 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3039 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3040 break;
3041 default:
6708bb27 3042 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3043 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3044 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3045 goto out_unsupported_cdb;
3046 }
3047
3048 if (size != cmd->data_length) {
6708bb27 3049 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3050 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3051 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3052 cmd->data_length, size, cdb[0]);
3053
3054 cmd->cmd_spdtl = size;
3055
3056 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3057 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3058 " WRITE data\n");
3059 goto out_invalid_cdb_field;
3060 }
3061 /*
3062 * Reject READ_* or WRITE_* with overflow/underflow for
3063 * type SCF_SCSI_DATA_SG_IO_CDB.
3064 */
6708bb27
AG		 3065 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3066 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3067 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3068 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3069 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3070 goto out_invalid_cdb_field;
3071 }
3072
3073 if (size > cmd->data_length) {
3074 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3075 cmd->residual_count = (size - cmd->data_length);
3076 } else {
3077 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3078 cmd->residual_count = (cmd->data_length - size);
3079 }
3080 cmd->data_length = size;
3081 }
3082
5bda90c8
CH		 3083 /* reject any command that we don't have a handler for */
3084 if (!(passthrough || cmd->execute_task ||
3085 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3086 goto out_unsupported_cdb;
3087
c66ac9db
NB		 3088 transport_set_supported_SAM_opcode(cmd);
3089 return ret;
3090
3091out_unsupported_cdb:
3092 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3093 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3094 return -EINVAL;
c66ac9db
NB		 3095out_invalid_cdb_field:
3096 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3097 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3098 return -EINVAL;
c66ac9db
NB		 3099}
3100
c66ac9db 3101/*
35e0e757 3102 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3103 * and ordered cmds need to have their tasks added to the execution queue.
3104 */
3105static void transport_complete_task_attr(struct se_cmd *cmd)
3106{
5951146d 3107 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3108 struct se_cmd *cmd_p, *cmd_tmp;
3109 int new_active_tasks = 0;
3110
e66ecd50 3111 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3112 atomic_dec(&dev->simple_cmds);
3113 smp_mb__after_atomic_dec();
3114 dev->dev_cur_ordered_id++;
6708bb27 3115 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3116 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3117 cmd->se_ordered_id);
e66ecd50 3118 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3119 dev->dev_cur_ordered_id++;
6708bb27 3120 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3121 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3122 cmd->se_ordered_id);
e66ecd50 3123 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3124 atomic_dec(&dev->dev_ordered_sync);
3125 smp_mb__after_atomic_dec();
c66ac9db
NB		 3126
3127 dev->dev_cur_ordered_id++;
6708bb27 3128 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3129 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3130 }
3131 /*
3132 * Process all commands up to the last received
3133 * ORDERED task attribute which requires another blocking
3134 * boundary
3135 */
3136 spin_lock(&dev->delayed_cmd_lock);
3137 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3138 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3139
5951146d 3140 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3141 spin_unlock(&dev->delayed_cmd_lock);
3142
6708bb27 3143 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3144 " cmd_p: 0x%02x Task Attr: 0x%02x"
3145 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3146 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3147 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3148
3149 transport_add_tasks_from_cmd(cmd_p);
3150 new_active_tasks++;
3151
3152 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3153 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3154 break;
3155 }
3156 spin_unlock(&dev->delayed_cmd_lock);
3157 /*
3158 * If new tasks have become active, wake up the transport thread
3159 * to do the processing of the Active tasks.
3160 */
3161 if (new_active_tasks != 0)
e3d6f909 3162 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3163}
3164
e057f533 3165static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3166{
3167 int ret = 0;
3168
e057f533
CH		 3169 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3170 transport_complete_task_attr(cmd);
3171
3172 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3173 ret = cmd->se_tfo->queue_status(cmd);
3174 if (ret)
3175 goto out;
3176 }
07bde79a
NB		 3177
3178 switch (cmd->data_direction) {
3179 case DMA_FROM_DEVICE:
3180 ret = cmd->se_tfo->queue_data_in(cmd);
3181 break;
3182 case DMA_TO_DEVICE:
ec98f782 3183 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3184 ret = cmd->se_tfo->queue_data_in(cmd);
3185 if (ret < 0)
e057f533 3186 break;
07bde79a
NB		 3187 }
3188 /* Fall through for DMA_TO_DEVICE */
3189 case DMA_NONE:
3190 ret = cmd->se_tfo->queue_status(cmd);
3191 break;
3192 default:
3193 break;
3194 }
3195
e057f533
CH		 3196out:
3197 if (ret < 0) {
3198 transport_handle_queue_full(cmd, cmd->se_dev);
3199 return;
3200 }
3201 transport_lun_remove_cmd(cmd);
3202 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3203}
3204
3205static void transport_handle_queue_full(
3206 struct se_cmd *cmd,
e057f533 3207 struct se_device *dev)
07bde79a
NB		 3208{
3209 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3210 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3211 atomic_inc(&dev->dev_qf_count);
3212 smp_mb__after_atomic_inc();
3213 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3214
3215 schedule_work(&cmd->se_dev->qf_work_queue);
3216}
3217
35e0e757 3218static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3219{
35e0e757 3220 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3221 int reason = 0, ret;
35e0e757 3222
c66ac9db
NB		 3223 /*
3224 * Check if we need to move delayed/dormant tasks from cmds on the
3225 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3226 * Attribute.
3227 */
5951146d 3228 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3229 transport_complete_task_attr(cmd);
07bde79a
NB		 3230 /*
3231 * Check to schedule QUEUE_FULL work, or execute an existing
3232 * cmd->transport_qf_callback()
3233 */
3234 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3235 schedule_work(&cmd->se_dev->qf_work_queue);
3236
c66ac9db
NB		 3237 /*
3238 * Check if we need to retrieve a sense buffer from
3239 * the struct se_cmd in question.
3240 */
3241 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3242 if (transport_get_sense_data(cmd) < 0)
3243 reason = TCM_NON_EXISTENT_LUN;
3244
3245 /*
3246 * Only set when an struct se_task->task_scsi_status returned
3247 * a non GOOD status.
3248 */
3249 if (cmd->scsi_status) {
07bde79a 3250 ret = transport_send_check_condition_and_sense(
c66ac9db 3251 cmd, reason, 1);
f147abb4 3252 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3253 goto queue_full;
3254
c66ac9db
NB		 3255 transport_lun_remove_cmd(cmd);
3256 transport_cmd_check_stop_to_fabric(cmd);
3257 return;
3258 }
3259 }
3260 /*
25985edc 3261 * Check for a callback, used by amongst other things
c66ac9db
NB		 3262 * XDWRITE_READ_10 emulation.
3263 */
3264 if (cmd->transport_complete_callback)
3265 cmd->transport_complete_callback(cmd);
3266
3267 switch (cmd->data_direction) {
3268 case DMA_FROM_DEVICE:
3269 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3270 if (cmd->se_lun->lun_sep) {
3271 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3272 cmd->data_length;
3273 }
3274 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3275
07bde79a 3276 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3277 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3278 goto queue_full;
c66ac9db
NB		 3279 break;
3280 case DMA_TO_DEVICE:
3281 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3282 if (cmd->se_lun->lun_sep) {
3283 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3284 cmd->data_length;
3285 }
3286 spin_unlock(&cmd->se_lun->lun_sep_lock);
3287 /*
3288 * Check if we need to send READ payload for BIDI-COMMAND
3289 */
ec98f782 3290 if (cmd->t_bidi_data_sg) {
c66ac9db 3291 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3292 if (cmd->se_lun->lun_sep) {
3293 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3294 cmd->data_length;
3295 }
3296 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3297 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3298 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3299 goto queue_full;
c66ac9db
NB		 3300 break;
3301 }
3302 /* Fall through for DMA_TO_DEVICE */
3303 case DMA_NONE:
07bde79a 3304 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3305 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3306 goto queue_full;
c66ac9db
NB		 3307 break;
3308 default:
3309 break;
3310 }
3311
3312 transport_lun_remove_cmd(cmd);
3313 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3314 return;
3315
3316queue_full:
6708bb27 3317 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3318 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3319 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3320 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3321}
3322
3323static void transport_free_dev_tasks(struct se_cmd *cmd)
3324{
3325 struct se_task *task, *task_tmp;
3326 unsigned long flags;
0c2cfe5f 3327 LIST_HEAD(dispose_list);
c66ac9db 3328
a1d8b49a 3329 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3330 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3331 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3332 if (!(task->task_flags & TF_ACTIVE))
3333 list_move_tail(&task->t_list, &dispose_list);
3334 }
3335 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3336
3337 while (!list_empty(&dispose_list)) {
3338 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3339
af3f00c7
CH		 3340 if (task->task_sg != cmd->t_data_sg &&
3341 task->task_sg != cmd->t_bidi_data_sg)
3342 kfree(task->task_sg);
c66ac9db
NB		 3343
3344 list_del(&task->t_list);
3345
42bf829e 3346 cmd->se_dev->transport->free_task(task);
c66ac9db 3347 }
c66ac9db
NB		 3348}
3349
6708bb27 3350static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3351{
ec98f782 3352 struct scatterlist *sg;
ec98f782 3353 int count;
c66ac9db 3354
6708bb27
AG		 3355 for_each_sg(sgl, sg, nents, count)
3356 __free_page(sg_page(sg));
c66ac9db 3357
6708bb27
AG		 3358 kfree(sgl);
3359}
c66ac9db 3360
6708bb27
AG		 3361static inline void transport_free_pages(struct se_cmd *cmd)
3362{
3363 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3364 return;
3365
3366 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3367 cmd->t_data_sg = NULL;
3368 cmd->t_data_nents = 0;
c66ac9db 3369
6708bb27 3370 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3371 cmd->t_bidi_data_sg = NULL;
3372 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3373}
3374
e26d99ae
CH		 3375/**
3376 * transport_release_cmd - free a command
3377 * @cmd: command to free
3378 *
3379 * This routine unconditionally frees a command, and reference counting
3380 * or list removal must be done in the caller.
3381 */
3382static void transport_release_cmd(struct se_cmd *cmd)
3383{
3384 BUG_ON(!cmd->se_tfo);
3385
3386 if (cmd->se_tmr_req)
3387 core_tmr_release_req(cmd->se_tmr_req);
3388 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3389 kfree(cmd->t_task_cdb);
3390 /*
7481deb4
NB		 3391 * If this cmd has been setup with target_get_sess_cmd(), drop
3392 * the kref and call ->release_cmd() in kref callback.
e26d99ae 3393 */
7481deb4
NB		 3394 if (cmd->check_release != 0) {
3395 target_put_sess_cmd(cmd->se_sess, cmd);
3396 return;
3397 }
e26d99ae
CH		 3398 cmd->se_tfo->release_cmd(cmd);
3399}
3400
d3df7825
CH		 3401/**
3402 * transport_put_cmd - release a reference to a command
3403 * @cmd: command to release
3404 *
3405 * This routine releases our reference to the command and frees it if possible.
3406 */
39c05f32 3407static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3408{
3409 unsigned long flags;
4911e3cc 3410 int free_tasks = 0;
c66ac9db 3411
a1d8b49a 3412 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3413 if (atomic_read(&cmd->t_fe_count)) {
3414 if (!atomic_dec_and_test(&cmd->t_fe_count))
3415 goto out_busy;
3416 }
3417
3418 if (atomic_read(&cmd->t_se_count)) {
3419 if (!atomic_dec_and_test(&cmd->t_se_count))
3420 goto out_busy;
3421 }
3422
3423 if (atomic_read(&cmd->transport_dev_active)) {
3424 atomic_set(&cmd->transport_dev_active, 0);
3425 transport_all_task_dev_remove_state(cmd);
3426 free_tasks = 1;
c66ac9db 3427 }
a1d8b49a 3428 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3429
4911e3cc
CH		 3430 if (free_tasks != 0)
3431 transport_free_dev_tasks(cmd);
d3df7825 3432
c66ac9db 3433 transport_free_pages(cmd);
31afc39c 3434 transport_release_cmd(cmd);
39c05f32 3435 return;
4911e3cc
CH		 3436out_busy:
3437 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3438}
3439
c66ac9db 3440/*
ec98f782
AG		 3441 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3442 * allocating in the core.
c66ac9db
NB		 3443 * @cmd: Associated se_cmd descriptor
3444 * @mem: SGL style memory for TCM WRITE / READ
3445 * @sg_mem_num: Number of SGL elements
3446 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3447 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3448 *
3449 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3450 * of parameters.
3451 */
3452int transport_generic_map_mem_to_cmd(
3453 struct se_cmd *cmd,
5951146d
AG		 3454 struct scatterlist *sgl,
3455 u32 sgl_count,
3456 struct scatterlist *sgl_bidi,
3457 u32 sgl_bidi_count)
c66ac9db 3458{
5951146d 3459 if (!sgl || !sgl_count)
c66ac9db 3460 return 0;
c66ac9db 3461
c66ac9db
NB		 3462 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3463 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
fef58a60
NB		 3464 /*
3465 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3466 * scatterlists already have been set to follow what the fabric
3467 * passes for the original expected data transfer length.
3468 */
3469 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3470 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3471 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3472 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3473 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3474 return -EINVAL;
3475 }
c66ac9db 3476
ec98f782
AG		 3477 cmd->t_data_sg = sgl;
3478 cmd->t_data_nents = sgl_count;
c66ac9db 3479
ec98f782
AG		 3480 if (sgl_bidi && sgl_bidi_count) {
3481 cmd->t_bidi_data_sg = sgl_bidi;
3482 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3483 }
3484 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3485 }
3486
3487 return 0;
3488}
3489EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3490
4949314c 3491void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3492{
ec98f782 3493 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 3494 struct page **pages;
3495 int i;
05d1c7c0 3496
ec98f782 3497 BUG_ON(!sg);
05d1c7c0 3498 /*
ec98f782
AG		 3499 * We need to take into account a possible offset here for fabrics like
3500 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3501 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3502 */
4949314c
AG		 3503 if (!cmd->t_data_nents)
3504 return NULL;
3505 else if (cmd->t_data_nents == 1)
3506 return kmap(sg_page(sg)) + sg->offset;
3507
3508 /* >1 page. use vmap */
3509 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3510 if (!pages)
3511 return NULL;
3512
3513 /* convert sg[] to pages[] */
3514 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3515 pages[i] = sg_page(sg);
3516 }
3517
3518 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
3519 kfree(pages);
3520 if (!cmd->t_data_vmap)
3521 return NULL;
3522
3523 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 3524}
4949314c 3525EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 3526
4949314c 3527void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3528{
4949314c
AG		 3529 if (!cmd->t_data_nents)
3530 return;
3531 else if (cmd->t_data_nents == 1)
3532 kunmap(sg_page(cmd->t_data_sg));
3533
3534 vunmap(cmd->t_data_vmap);
3535 cmd->t_data_vmap = NULL;
05d1c7c0 3536}
4949314c 3537EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 3538
c66ac9db 3539static int
05d1c7c0 3540transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3541{
ec98f782
AG		 3542 u32 length = cmd->data_length;
3543 unsigned int nents;
3544 struct page *page;
9db9da33 3545 gfp_t zero_flag;
ec98f782 3546 int i = 0;
c66ac9db 3547
ec98f782
AG		 3548 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3549 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3550 if (!cmd->t_data_sg)
3551 return -ENOMEM;
c66ac9db 3552
ec98f782
AG		 3553 cmd->t_data_nents = nents;
3554 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3555
9db9da33 3556 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3557
ec98f782
AG		 3558 while (length) {
3559 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 3560 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 3561 if (!page)
3562 goto out;
c66ac9db 3563
ec98f782
AG		 3564 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3565 length -= page_len;
3566 i++;
c66ac9db 3567 }
c66ac9db 3568 return 0;
c66ac9db 3569
ec98f782
AG		 3570out:
3571 while (i >= 0) {
3572 __free_page(sg_page(&cmd->t_data_sg[i]));
3573 i--;
c66ac9db 3574 }
ec98f782
AG		 3575 kfree(cmd->t_data_sg);
3576 cmd->t_data_sg = NULL;
3577 return -ENOMEM;
c66ac9db
NB		 3578}
3579
a1d8b49a
AG		 3580/* Reduce sectors if they are too long for the device */
3581static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3582 struct se_device *dev,
3583 unsigned long long lba,
a1d8b49a 3584 sector_t sectors)
c66ac9db 3585{
a1d8b49a 3586 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3587
a1d8b49a
AG		 3588 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3589 if ((lba + sectors) > transport_dev_end_lba(dev))
3590 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3591
a1d8b49a 3592 return sectors;
c66ac9db
NB		 3593}
3594
c66ac9db
NB		 3595
3596/*
3597 * This function can be used by HW target mode drivers to create a linked
3598 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3599 * This is intended to be called during the completion path by TCM Core
3600 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3601 */
3602void transport_do_task_sg_chain(struct se_cmd *cmd)
3603{
ec98f782
AG		 3604 struct scatterlist *sg_first = NULL;
3605 struct scatterlist *sg_prev = NULL;
3606 int sg_prev_nents = 0;
3607 struct scatterlist *sg;
c66ac9db 3608 struct se_task *task;
ec98f782 3609 u32 chained_nents = 0;
c66ac9db
NB		 3610 int i;
3611
ec98f782
AG		 3612 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3613
c66ac9db
NB		 3614 /*
3615 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3616 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3617 */
a1d8b49a 3618 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3619 if (!task->task_sg)
c66ac9db
NB		 3620 continue;
3621
ec98f782
AG		 3622 if (!sg_first) {
3623 sg_first = task->task_sg;
6708bb27 3624 chained_nents = task->task_sg_nents;
97868c89 3625 } else {
ec98f782 3626 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3627 chained_nents += task->task_sg_nents;
97868c89 3628 }
c3c74c7a
NB		 3629 /*
3630 * For the padded tasks, use the extra SGL vector allocated
3631 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3632 * offset into sg_chain() above.
3633 *
3634 * We do not need the padding for the last task (or a single
3635 * task), but in that case we will never use the sg_prev_nents
3636 * value below which would be incorrect.
c3c74c7a 3637 */
04629b7b 3638 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3639 sg_prev = task->task_sg;
c66ac9db
NB		 3640 }
3641 /*
3642 * Setup the starting pointer and total t_tasks_sg_linked_no including
3643 * padding SGs for linking and to mark the end.
3644 */
a1d8b49a 3645 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3646 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3647
6708bb27 3648 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3649 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3650 cmd->t_tasks_sg_chained_no);
c66ac9db 3651
a1d8b49a
AG		 3652 for_each_sg(cmd->t_tasks_sg_chained, sg,
3653 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3654
6708bb27 3655 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3656 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3657 if (sg_is_chain(sg))
6708bb27 3658 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3659 if (sg_is_last(sg))
6708bb27 3660 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3661 }
c66ac9db
NB		 3662}
3663EXPORT_SYMBOL(transport_do_task_sg_chain);
3664
a1d8b49a
AG		 3665/*
3666 * Break up cmd into chunks transport can handle
3667 */
38b40067
CH		 3668static int
3669transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3670 enum dma_data_direction data_direction,
38b40067 3671 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3672{
5951146d 3673 struct se_device *dev = cmd->se_dev;
a3eedc22 3674 int task_count, i;
38b40067
CH		 3675 unsigned long long lba;
3676 sector_t sectors, dev_max_sectors;
3677 u32 sector_size;
3678
3679 if (transport_cmd_get_valid_sectors(cmd) < 0)
3680 return -EINVAL;
3681
3682 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3683 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
a1d8b49a 3684
ec98f782 3685 WARN_ON(cmd->data_length % sector_size);
38b40067
CH		 3686
3687 lba = cmd->t_task_lba;
ec98f782 3688 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27 3689 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
af3f00c7
CH		 3690
3691 /*
3692 * If we need just a single task reuse the SG list in the command
3693 * and avoid a lot of work.
3694 */
3695 if (task_count == 1) {
3696 struct se_task *task;
3697 unsigned long flags;
3698
3699 task = transport_generic_get_task(cmd, data_direction);
3700 if (!task)
3701 return -ENOMEM;
3702
3703 task->task_sg = cmd_sg;
3704 task->task_sg_nents = sgl_nents;
3705
3706 task->task_lba = lba;
3707 task->task_sectors = sectors;
3708 task->task_size = task->task_sectors * sector_size;
3709
3710 spin_lock_irqsave(&cmd->t_state_lock, flags);
3711 list_add_tail(&task->t_list, &cmd->t_task_list);
3712 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3713
3714 return task_count;
3715 }
3716
ec98f782 3717 for (i = 0; i < task_count; i++) {
38b40067 3718 struct se_task *task;
c3c74c7a 3719 unsigned int task_size, task_sg_nents_padded;
38b40067
CH		 3720 struct scatterlist *sg;
3721 unsigned long flags;
ec98f782 3722 int count;
a1d8b49a 3723
c66ac9db 3724 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3725 if (!task)
ec98f782 3726 return -ENOMEM;
c66ac9db 3727
c66ac9db 3728 task->task_lba = lba;
ec98f782
AG		 3729 task->task_sectors = min(sectors, dev_max_sectors);
3730 task->task_size = task->task_sectors * sector_size;
c66ac9db 3731
525a48a2
NB		 3732 /*
3733 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3734 * in order to calculate the number per task SGL entries
3735 */
3736 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3737 /*
ec98f782
AG		 3738 * Check if the fabric module driver is requesting that all
3739 * struct se_task->task_sg[] be chained together.. If so,
3740 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3741 * marking the end of the chained SGL for every task except
3742 * the last one for (task_count > 1) operation, or skipping
3743 * the extra padding for the (task_count == 1) case.
c66ac9db 3744 */
c3c74c7a
NB		 3745 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3746 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3747 } else
3748 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3749
1d20bb61 3750 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3751 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3752 if (!task->task_sg) {
3753 cmd->se_dev->transport->free_task(task);
3754 return -ENOMEM;
3755 }
3756
c3c74c7a 3757 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3758
ec98f782
AG		 3759 task_size = task->task_size;
3760
3761 /* Build new sgl, only up to task_size */
6708bb27 3762 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3763 if (cmd_sg->length > task_size)
3764 break;
3765
3766 *sg = *cmd_sg;
3767 task_size -= cmd_sg->length;
3768 cmd_sg = sg_next(cmd_sg);
c66ac9db 3769 }
c66ac9db 3770
ec98f782
AG		 3771 lba += task->task_sectors;
3772 sectors -= task->task_sectors;
c66ac9db 3773
ec98f782
AG		 3774 spin_lock_irqsave(&cmd->t_state_lock, flags);
3775 list_add_tail(&task->t_list, &cmd->t_task_list);
3776 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3777 }
3778
ec98f782 3779 return task_count;
c66ac9db
NB		 3780}
3781
3782static int
ec98f782 3783transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3784{
c66ac9db 3785 struct se_task *task;
ec98f782 3786 unsigned long flags;
c66ac9db 3787
91ec1d35
NB		 3788 /* Workaround for handling zero-length control CDBs */
3789 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3790 !cmd->data_length)
3791 return 0;
3792
c66ac9db
NB		 3793 task = transport_generic_get_task(cmd, cmd->data_direction);
3794 if (!task)
ec98f782 3795 return -ENOMEM;
c66ac9db 3796
af3f00c7 3797 task->task_sg = cmd->t_data_sg;
c66ac9db 3798 task->task_size = cmd->data_length;
6708bb27 3799 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3800
ec98f782
AG		 3801 spin_lock_irqsave(&cmd->t_state_lock, flags);
3802 list_add_tail(&task->t_list, &cmd->t_task_list);
3803 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3804
6708bb27 3805 /* Success! Return number of tasks allocated */
a3eedc22 3806 return 1;
ec98f782
AG		 3807}
3808
da0f7619
CH		 3809/*
3810 * Allocate any required ressources to execute the command, and either place
3811 * it on the execution queue if possible. For writes we might not have the
3812 * payload yet, thus notify the fabric via a call to ->write_pending instead.
c66ac9db 3813 */
a1d8b49a 3814int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3815{
da0f7619 3816 struct se_device *dev = cmd->se_dev;
9ac54987 3817 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3818 int set_counts = 1;
c66ac9db
NB		 3819 int ret = 0;
3820
3821 /*
3822 * Determine is the TCM fabric module has already allocated physical
3823 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3824 * beforehand.
c66ac9db 3825 */
ec98f782
AG		 3826 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3827 cmd->data_length) {
05d1c7c0 3828 ret = transport_generic_get_mem(cmd);
c66ac9db 3829 if (ret < 0)
03e98c9e 3830 goto out_fail;
c66ac9db 3831 }
da0f7619 3832
1d20bb61 3833 /*
38b40067 3834 * For BIDI command set up the read tasks first.
1d20bb61 3835 */
da0f7619 3836 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3837 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3838 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3839
9ac54987
NB		 3840 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3841 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3842 cmd->t_bidi_data_nents);
3843 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3844 goto out_fail;
3845
3846 atomic_inc(&cmd->t_fe_count);
3847 atomic_inc(&cmd->t_se_count);
3848 set_counts = 0;
3849 }
38b40067
CH		 3850
3851 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3852 task_cdbs = transport_allocate_data_tasks(cmd,
3853 cmd->data_direction, cmd->t_data_sg,
3854 cmd->t_data_nents);
3855 } else {
3856 task_cdbs = transport_allocate_control_task(cmd);
3857 }
3858
410f6702 3859 if (task_cdbs < 0)
da0f7619 3860 goto out_fail;
410f6702
RD		 3861 else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3862 cmd->t_state = TRANSPORT_COMPLETE;
3863 atomic_set(&cmd->t_transport_active, 1);
91ec1d35
NB		 3864
3865 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3866 u8 ua_asc = 0, ua_ascq = 0;
3867
3868 core_scsi3_ua_clear_for_request_sense(cmd,
3869 &ua_asc, &ua_ascq);
3870 }
3871
410f6702
RD		 3872 INIT_WORK(&cmd->work, target_complete_ok_work);
3873 queue_work(target_completion_wq, &cmd->work);
3874 return 0;
3875 }
da0f7619
CH		 3876
3877 if (set_counts) {
3878 atomic_inc(&cmd->t_fe_count);
3879 atomic_inc(&cmd->t_se_count);
3880 }
3881
9ac54987
NB		 3882 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3883 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3884 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3885
c66ac9db 3886 /*
a1d8b49a 3887 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3888 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3889 * will be added to the struct se_device execution queue after its WRITE
3890 * data has arrived. (ie: It gets handled by the transport processing
3891 * thread a second time)
3892 */
3893 if (cmd->data_direction == DMA_TO_DEVICE) {
3894 transport_add_tasks_to_state_queue(cmd);
3895 return transport_generic_write_pending(cmd);
3896 }
3897 /*
3898 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3899 * to the execution queue.
3900 */
3901 transport_execute_tasks(cmd);
3902 return 0;
da0f7619
CH		 3903
3904out_fail:
3905 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3906 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3907 return -EINVAL;
c66ac9db 3908}
a1d8b49a 3909EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3910
3911/* transport_generic_process_write():
3912 *
3913 *
3914 */
3915void transport_generic_process_write(struct se_cmd *cmd)
3916{
c66ac9db
NB		 3917 transport_execute_tasks(cmd);
3918}
3919EXPORT_SYMBOL(transport_generic_process_write);
3920
e057f533 3921static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3922{
f147abb4
NB		 3923 int ret;
3924
3925 ret = cmd->se_tfo->write_pending(cmd);
3926 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3927 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3928 cmd);
3929 transport_handle_queue_full(cmd, cmd->se_dev);
3930 }
07bde79a
NB		 3931}
3932
c66ac9db
NB		 3933static int transport_generic_write_pending(struct se_cmd *cmd)
3934{
3935 unsigned long flags;
3936 int ret;
3937
a1d8b49a 3938 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3939 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3940 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3941
c66ac9db
NB		 3942 /*
3943 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 3944 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 3945 * can be called from HW target mode interrupt code. This is safe
e3d6f909 3946 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3947 * because the se_cmd->se_lun pointer is not being cleared.
3948 */
3949 transport_cmd_check_stop(cmd, 1, 0);
3950
3951 /*
3952 * Call the fabric write_pending function here to let the
3953 * frontend know that WRITE buffers are ready.
3954 */
e3d6f909 3955 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3956 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3957 goto queue_full;
3958 else if (ret < 0)
c66ac9db
NB		 3959 return ret;
3960
03e98c9e 3961 return 1;
07bde79a
NB		 3962
3963queue_full:
6708bb27 3964 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3965 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3966 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3967 return 0;
c66ac9db
NB		 3968}
3969
39c05f32 3970void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3971{
d14921d6
NB		 3972 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3973 if (wait_for_tasks && cmd->se_tmr_req)
3974 transport_wait_for_tasks(cmd);
3975
35462975 3976 transport_release_cmd(cmd);
d14921d6
NB		 3977 } else {
3978 if (wait_for_tasks)
3979 transport_wait_for_tasks(cmd);
3980
c66ac9db
NB		 3981 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3982
82f1c8a4 3983 if (cmd->se_lun)
c66ac9db 3984 transport_lun_remove_cmd(cmd);
c66ac9db 3985
f4366772
NB		 3986 transport_free_dev_tasks(cmd);
3987
39c05f32 3988 transport_put_cmd(cmd);
c66ac9db
NB		 3989 }
3990}
3991EXPORT_SYMBOL(transport_generic_free_cmd);
3992
a17f091d
NB		 3993/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3994 * @se_sess: session to reference
3995 * @se_cmd: command descriptor to add
a6360785 3996 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 3997 */
a6360785
NB		 3998void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3999 bool ack_kref)
a17f091d
NB		 4000{
4001 unsigned long flags;
4002
7481deb4 4003 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 4004 /*
4005 * Add a second kref if the fabric caller is expecting to handle
4006 * fabric acknowledgement that requires two target_put_sess_cmd()
4007 * invocations before se_cmd descriptor release.
4008 */
4009 if (ack_kref == true)
4010 kref_get(&se_cmd->cmd_kref);
7481deb4 4011
a17f091d
NB		 4012 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4013 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
4014 se_cmd->check_release = 1;
4015 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4016}
4017EXPORT_SYMBOL(target_get_sess_cmd);
4018
7481deb4 4019static void target_release_cmd_kref(struct kref *kref)
a17f091d 4020{
7481deb4
NB		 4021 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
4022 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 4023 unsigned long flags;
4024
4025 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4026 if (list_empty(&se_cmd->se_cmd_list)) {
4027 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4028 WARN_ON(1);
7481deb4 4029 return;
a17f091d 4030 }
a17f091d
NB		 4031 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
4032 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4033 complete(&se_cmd->cmd_wait_comp);
7481deb4 4034 return;
a17f091d
NB		 4035 }
4036 list_del(&se_cmd->se_cmd_list);
4037 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4038
7481deb4
NB		 4039 se_cmd->se_tfo->release_cmd(se_cmd);
4040}
4041
4042/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4043 * @se_sess: session to reference
4044 * @se_cmd: command descriptor to drop
4045 */
4046int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4047{
4048 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 4049}
4050EXPORT_SYMBOL(target_put_sess_cmd);
4051
4052/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4053 * @se_sess: session to split
4054 */
4055void target_splice_sess_cmd_list(struct se_session *se_sess)
4056{
4057 struct se_cmd *se_cmd;
4058 unsigned long flags;
4059
4060 WARN_ON(!list_empty(&se_sess->sess_wait_list));
4061 INIT_LIST_HEAD(&se_sess->sess_wait_list);
4062
4063 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4064 se_sess->sess_tearing_down = 1;
4065
4066 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4067
4068 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4069 se_cmd->cmd_wait_set = 1;
4070
4071 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4072}
4073EXPORT_SYMBOL(target_splice_sess_cmd_list);
4074
4075/* target_wait_for_sess_cmds - Wait for outstanding descriptors
4076 * @se_sess: session to wait for active I/O
4077 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4078 */
4079void target_wait_for_sess_cmds(
4080 struct se_session *se_sess,
4081 int wait_for_tasks)
4082{
4083 struct se_cmd *se_cmd, *tmp_cmd;
4084 bool rc = false;
4085
4086 list_for_each_entry_safe(se_cmd, tmp_cmd,
4087 &se_sess->sess_wait_list, se_cmd_list) {
4088 list_del(&se_cmd->se_cmd_list);
4089
4090 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4091 " %d\n", se_cmd, se_cmd->t_state,
4092 se_cmd->se_tfo->get_cmd_state(se_cmd));
4093
4094 if (wait_for_tasks) {
4095 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4096 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4097 se_cmd->se_tfo->get_cmd_state(se_cmd));
4098
4099 rc = transport_wait_for_tasks(se_cmd);
4100
4101 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4102 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4103 se_cmd->se_tfo->get_cmd_state(se_cmd));
4104 }
4105
4106 if (!rc) {
4107 wait_for_completion(&se_cmd->cmd_wait_comp);
4108 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4109 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4110 se_cmd->se_tfo->get_cmd_state(se_cmd));
4111 }
4112
4113 se_cmd->se_tfo->release_cmd(se_cmd);
4114 }
4115}
4116EXPORT_SYMBOL(target_wait_for_sess_cmds);
4117
c66ac9db
NB		 4118/* transport_lun_wait_for_tasks():
4119 *
4120 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4121 * an struct se_lun to be successfully shutdown.
4122 */
4123static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4124{
4125 unsigned long flags;
4126 int ret;
4127 /*
4128 * If the frontend has already requested this struct se_cmd to
4129 * be stopped, we can safely ignore this struct se_cmd.
4130 */
a1d8b49a
AG		 4131 spin_lock_irqsave(&cmd->t_state_lock, flags);
4132 if (atomic_read(&cmd->t_transport_stop)) {
4133 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4134 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4135 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4136 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4137 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4138 return -EPERM;
c66ac9db 4139 }
a1d8b49a
AG		 4140 atomic_set(&cmd->transport_lun_fe_stop, 1);
4141 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4142
5951146d 4143 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4144
4145 ret = transport_stop_tasks_for_cmd(cmd);
4146
6708bb27
AG		 4147 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4148 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4149 if (!ret) {
6708bb27 4150 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4151 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4152 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4153 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4154 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4155 }
3df8d40b 4156 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4157
4158 return 0;
4159}
4160
c66ac9db
NB		 4161static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4162{
4163 struct se_cmd *cmd = NULL;
4164 unsigned long lun_flags, cmd_flags;
4165 /*
4166 * Do exception processing and return CHECK_CONDITION status to the
4167 * Initiator Port.
4168 */
4169 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4170 while (!list_empty(&lun->lun_cmd_list)) {
4171 cmd = list_first_entry(&lun->lun_cmd_list,
4172 struct se_cmd, se_lun_node);
4173 list_del(&cmd->se_lun_node);
4174
a1d8b49a 4175 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4176 /*
4177 * This will notify iscsi_target_transport.c:
4178 * transport_cmd_check_stop() that a LUN shutdown is in
4179 * progress for the iscsi_cmd_t.
4180 */
a1d8b49a 4181 spin_lock(&cmd->t_state_lock);
6708bb27 4182 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4183 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4184 cmd->se_lun->unpacked_lun,
4185 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4186 atomic_set(&cmd->transport_lun_stop, 1);
4187 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4188
4189 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4190
6708bb27
AG		 4191 if (!cmd->se_lun) {
4192 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4193 cmd->se_tfo->get_task_tag(cmd),
4194 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4195 BUG();
4196 }
4197 /*
4198 * If the Storage engine still owns the iscsi_cmd_t, determine
4199 * and/or stop its context.
4200 */
6708bb27 4201 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4202 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4203 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4204
e3d6f909 4205 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4206 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4207 continue;
4208 }
4209
6708bb27 4210 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4211 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4212 cmd->se_lun->unpacked_lun,
4213 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4214
a1d8b49a 4215 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4216 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4217 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4218 goto check_cond;
4219 }
a1d8b49a 4220 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4221 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4222 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4223
4224 transport_free_dev_tasks(cmd);
4225 /*
4226 * The Storage engine stopped this struct se_cmd before it was
4227 * send to the fabric frontend for delivery back to the
4228 * Initiator Node. Return this SCSI CDB back with an
4229 * CHECK_CONDITION status.
4230 */
4231check_cond:
4232 transport_send_check_condition_and_sense(cmd,
4233 TCM_NON_EXISTENT_LUN, 0);
4234 /*
4235 * If the fabric frontend is waiting for this iscsi_cmd_t to
4236 * be released, notify the waiting thread now that LU has
4237 * finished accessing it.
4238 */
a1d8b49a
AG		 4239 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4240 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4241 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4242 " struct se_cmd: %p ITT: 0x%08x\n",
4243 lun->unpacked_lun,
e3d6f909 4244 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4245
a1d8b49a 4246 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4247 cmd_flags);
4248 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4249 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4250 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4251 continue;
4252 }
6708bb27 4253 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4254 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4255
a1d8b49a 4256 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4257 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4258 }
4259 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4260}
4261
4262static int transport_clear_lun_thread(void *p)
4263{
8359cf43 4264 struct se_lun *lun = p;
c66ac9db
NB		 4265
4266 __transport_clear_lun_from_sessions(lun);
4267 complete(&lun->lun_shutdown_comp);
4268
4269 return 0;
4270}
4271
4272int transport_clear_lun_from_sessions(struct se_lun *lun)
4273{
4274 struct task_struct *kt;
4275
5951146d 4276 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4277 "tcm_cl_%u", lun->unpacked_lun);
4278 if (IS_ERR(kt)) {
6708bb27 4279 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4280 return PTR_ERR(kt);
c66ac9db
NB		 4281 }
4282 wait_for_completion(&lun->lun_shutdown_comp);
4283
4284 return 0;
4285}
4286
d14921d6
NB		 4287/**
4288 * transport_wait_for_tasks - wait for completion to occur
4289 * @cmd: command to wait
c66ac9db 4290 *
d14921d6
NB		 4291 * Called from frontend fabric context to wait for storage engine
4292 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4293 */
a17f091d 4294bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4295{
4296 unsigned long flags;
4297
a1d8b49a 4298 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4299 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4300 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4301 return false;
d14921d6
NB		 4302 }
4303 /*
4304 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4305 * has been set in transport_set_supported_SAM_opcode().
4306 */
4307 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4308 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4309 return false;
d14921d6 4310 }
c66ac9db
NB		 4311 /*
4312 * If we are already stopped due to an external event (ie: LUN shutdown)
4313 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4314 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4315 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4316 * has completed its operation on the struct se_cmd.
4317 */
a1d8b49a 4318 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4319
6708bb27 4320 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4321 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4322 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4323 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4324 /*
4325 * There is a special case for WRITES where a FE exception +
4326 * LUN shutdown means ConfigFS context is still sleeping on
4327 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4328 * We go ahead and up transport_lun_stop_comp just to be sure
4329 * here.
4330 */
a1d8b49a
AG		 4331 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4332 complete(&cmd->transport_lun_stop_comp);
4333 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4334 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4335
4336 transport_all_task_dev_remove_state(cmd);
4337 /*
4338 * At this point, the frontend who was the originator of this
4339 * struct se_cmd, now owns the structure and can be released through
4340 * normal means below.
4341 */
6708bb27 4342 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4343 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4344 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4345 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4346
a1d8b49a 4347 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4348 }
a1d8b49a 4349 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4350 atomic_read(&cmd->t_transport_aborted)) {
4351 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4352 return false;
d14921d6 4353 }
c66ac9db 4354
a1d8b49a 4355 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4356
6708bb27 4357 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
f2da9dbd
CH		 4358 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4359 cmd, cmd->se_tfo->get_task_tag(cmd),
4360 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4361
a1d8b49a 4362 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4363
5951146d 4364 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4365
a1d8b49a 4366 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4367
a1d8b49a
AG		 4368 spin_lock_irqsave(&cmd->t_state_lock, flags);
4369 atomic_set(&cmd->t_transport_active, 0);
4370 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4371
6708bb27 4372 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4373 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4374 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4375
d14921d6 4376 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4377
4378 return true;
c66ac9db 4379}
d14921d6 4380EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4381
4382static int transport_get_sense_codes(
4383 struct se_cmd *cmd,
4384 u8 *asc,
4385 u8 *ascq)
4386{
4387 *asc = cmd->scsi_asc;
4388 *ascq = cmd->scsi_ascq;
4389
4390 return 0;
4391}
4392
4393static int transport_set_sense_codes(
4394 struct se_cmd *cmd,
4395 u8 asc,
4396 u8 ascq)
4397{
4398 cmd->scsi_asc = asc;
4399 cmd->scsi_ascq = ascq;
4400
4401 return 0;
4402}
4403
4404int transport_send_check_condition_and_sense(
4405 struct se_cmd *cmd,
4406 u8 reason,
4407 int from_transport)
4408{
4409 unsigned char *buffer = cmd->sense_buffer;
4410 unsigned long flags;
4411 int offset;
4412 u8 asc = 0, ascq = 0;
4413
a1d8b49a 4414 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4415 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4416 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4417 return 0;
4418 }
4419 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4420 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4421
4422 if (!reason && from_transport)
4423 goto after_reason;
4424
4425 if (!from_transport)
4426 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4427 /*
4428 * Data Segment and SenseLength of the fabric response PDU.
4429 *
4430 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4431 * from include/scsi/scsi_cmnd.h
4432 */
e3d6f909 4433 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4434 TRANSPORT_SENSE_BUFFER);
4435 /*
4436 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4437 * SENSE KEY values from include/scsi/scsi.h
4438 */
4439 switch (reason) {
4440 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4441 /* CURRENT ERROR */
4442 buffer[offset] = 0x70;
895f3022 4443 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 4444 /* ILLEGAL REQUEST */
4445 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4446 /* LOGICAL UNIT NOT SUPPORTED */
4447 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4448 break;
c66ac9db
NB		 4449 case TCM_UNSUPPORTED_SCSI_OPCODE:
4450 case TCM_SECTOR_COUNT_TOO_MANY:
4451 /* CURRENT ERROR */
4452 buffer[offset] = 0x70;
895f3022 4453 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4454 /* ILLEGAL REQUEST */
4455 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4456 /* INVALID COMMAND OPERATION CODE */
4457 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4458 break;
4459 case TCM_UNKNOWN_MODE_PAGE:
4460 /* CURRENT ERROR */
4461 buffer[offset] = 0x70;
895f3022 4462 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4463 /* ILLEGAL REQUEST */
4464 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4465 /* INVALID FIELD IN CDB */
4466 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4467 break;
4468 case TCM_CHECK_CONDITION_ABORT_CMD:
4469 /* CURRENT ERROR */
4470 buffer[offset] = 0x70;
895f3022 4471 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4472 /* ABORTED COMMAND */
4473 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4474 /* BUS DEVICE RESET FUNCTION OCCURRED */
4475 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4476 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4477 break;
4478 case TCM_INCORRECT_AMOUNT_OF_DATA:
4479 /* CURRENT ERROR */
4480 buffer[offset] = 0x70;
895f3022 4481 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4482 /* ABORTED COMMAND */
4483 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4484 /* WRITE ERROR */
4485 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4486 /* NOT ENOUGH UNSOLICITED DATA */
4487 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4488 break;
4489 case TCM_INVALID_CDB_FIELD:
4490 /* CURRENT ERROR */
4491 buffer[offset] = 0x70;
895f3022 4492 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4493 /* ILLEGAL REQUEST */
4494 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4495 /* INVALID FIELD IN CDB */
4496 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4497 break;
4498 case TCM_INVALID_PARAMETER_LIST:
4499 /* CURRENT ERROR */
4500 buffer[offset] = 0x70;
895f3022 4501 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4502 /* ILLEGAL REQUEST */
4503 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4504 /* INVALID FIELD IN PARAMETER LIST */
4505 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4506 break;
4507 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4508 /* CURRENT ERROR */
4509 buffer[offset] = 0x70;
895f3022 4510 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4511 /* ABORTED COMMAND */
4512 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4513 /* WRITE ERROR */
4514 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4515 /* UNEXPECTED_UNSOLICITED_DATA */
4516 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4517 break;
4518 case TCM_SERVICE_CRC_ERROR:
4519 /* CURRENT ERROR */
4520 buffer[offset] = 0x70;
895f3022 4521 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4522 /* ABORTED COMMAND */
4523 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4524 /* PROTOCOL SERVICE CRC ERROR */
4525 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4526 /* N/A */
4527 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4528 break;
4529 case TCM_SNACK_REJECTED:
4530 /* CURRENT ERROR */
4531 buffer[offset] = 0x70;
895f3022 4532 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4533 /* ABORTED COMMAND */
4534 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4535 /* READ ERROR */
4536 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4537 /* FAILED RETRANSMISSION REQUEST */
4538 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4539 break;
4540 case TCM_WRITE_PROTECTED:
4541 /* CURRENT ERROR */
4542 buffer[offset] = 0x70;
895f3022 4543 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4544 /* DATA PROTECT */
4545 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4546 /* WRITE PROTECTED */
4547 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4548 break;
4549 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4550 /* CURRENT ERROR */
4551 buffer[offset] = 0x70;
895f3022 4552 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4553 /* UNIT ATTENTION */
4554 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4555 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4556 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4557 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4558 break;
4559 case TCM_CHECK_CONDITION_NOT_READY:
4560 /* CURRENT ERROR */
4561 buffer[offset] = 0x70;
895f3022 4562 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4563 /* Not Ready */
4564 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4565 transport_get_sense_codes(cmd, &asc, &ascq);
4566 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4567 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4568 break;
4569 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4570 default:
4571 /* CURRENT ERROR */
4572 buffer[offset] = 0x70;
895f3022 4573 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4574 /* ILLEGAL REQUEST */
4575 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4576 /* LOGICAL UNIT COMMUNICATION FAILURE */
4577 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4578 break;
4579 }
4580 /*
4581 * This code uses linux/include/scsi/scsi.h SAM status codes!
4582 */
4583 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4584 /*
4585 * Automatically padded, this value is encoded in the fabric's
4586 * data_length response PDU containing the SCSI defined sense data.
4587 */
4588 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4589
4590after_reason:
07bde79a 4591 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4592}
4593EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4594
4595int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4596{
4597 int ret = 0;
4598
a1d8b49a 4599 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4600 if (!send_status ||
c66ac9db
NB		 4601 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4602 return 1;
4603#if 0
6708bb27 4604 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4605 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4606 cmd->t_task_cdb[0],
e3d6f909 4607 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4608#endif
4609 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4610 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4611 ret = 1;
4612 }
4613 return ret;
4614}
4615EXPORT_SYMBOL(transport_check_aborted_status);
4616
4617void transport_send_task_abort(struct se_cmd *cmd)
4618{
c252f003
NB		 4619 unsigned long flags;
4620
4621 spin_lock_irqsave(&cmd->t_state_lock, flags);
4622 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4623 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4624 return;
4625 }
4626 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4627
c66ac9db
NB		 4628 /*
4629 * If there are still expected incoming fabric WRITEs, we wait
4630 * until until they have completed before sending a TASK_ABORTED
4631 * response. This response with TASK_ABORTED status will be
4632 * queued back to fabric module by transport_check_aborted_status().
4633 */
4634 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4635 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4636 atomic_inc(&cmd->t_transport_aborted);
c66ac9db 4637 smp_mb__after_atomic_inc();
c66ac9db
NB		 4638 }
4639 }
4640 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4641#if 0
6708bb27 4642 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4643 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4644 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4645#endif
e3d6f909 4646 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4647}
4648
e26d99ae 4649static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4650{
5951146d 4651 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4652 struct se_tmr_req *tmr = cmd->se_tmr_req;
4653 int ret;
4654
4655 switch (tmr->function) {
5c6cd613 4656 case TMR_ABORT_TASK:
c66ac9db
NB		 4657 tmr->response = TMR_FUNCTION_REJECTED;
4658 break;
5c6cd613
NB		 4659 case TMR_ABORT_TASK_SET:
4660 case TMR_CLEAR_ACA:
4661 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4662 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4663 break;
5c6cd613 4664 case TMR_LUN_RESET:
c66ac9db
NB		 4665 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4666 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4667 TMR_FUNCTION_REJECTED;
4668 break;
5c6cd613 4669 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4670 tmr->response = TMR_FUNCTION_REJECTED;
4671 break;
5c6cd613 4672 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4673 tmr->response = TMR_FUNCTION_REJECTED;
4674 break;
c66ac9db 4675 default:
6708bb27 4676 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4677 tmr->function);
4678 tmr->response = TMR_FUNCTION_REJECTED;
4679 break;
4680 }
4681
4682 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4683 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4684
b7b8bef7 4685 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4686 return 0;
4687}
4688
c66ac9db
NB		 4689/* transport_processing_thread():
4690 *
4691 *
4692 */
4693static int transport_processing_thread(void *param)
4694{
5951146d 4695 int ret;
c66ac9db 4696 struct se_cmd *cmd;
8359cf43 4697 struct se_device *dev = param;
c66ac9db 4698
c66ac9db 4699 while (!kthread_should_stop()) {
e3d6f909
AG		 4700 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4701 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4702 kthread_should_stop());
4703 if (ret < 0)
4704 goto out;
4705
c66ac9db 4706get_cmd:
5951146d
AG		 4707 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4708 if (!cmd)
c66ac9db
NB		 4709 continue;
4710
5951146d 4711 switch (cmd->t_state) {
680b73c5
CH		 4712 case TRANSPORT_NEW_CMD:
4713 BUG();
4714 break;
c66ac9db 4715 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4716 if (!cmd->se_tfo->new_cmd_map) {
4717 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4718 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4719 BUG();
4720 }
e3d6f909 4721 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4722 if (ret < 0) {
03e98c9e 4723 transport_generic_request_failure(cmd);
c66ac9db
NB		 4724 break;
4725 }
c66ac9db 4726 ret = transport_generic_new_cmd(cmd);
f147abb4 4727 if (ret < 0) {
03e98c9e
NB		 4728 transport_generic_request_failure(cmd);
4729 break;
c66ac9db
NB		 4730 }
4731 break;
4732 case TRANSPORT_PROCESS_WRITE:
4733 transport_generic_process_write(cmd);
4734 break;
c66ac9db
NB		 4735 case TRANSPORT_PROCESS_TMR:
4736 transport_generic_do_tmr(cmd);
4737 break;
07bde79a 4738 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4739 transport_write_pending_qf(cmd);
4740 break;
4741 case TRANSPORT_COMPLETE_QF_OK:
4742 transport_complete_qf(cmd);
07bde79a 4743 break;
c66ac9db 4744 default:
f2da9dbd
CH		 4745 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4746 "i_state: %d on SE LUN: %u\n",
4747 cmd->t_state,
e3d6f909
AG		 4748 cmd->se_tfo->get_task_tag(cmd),
4749 cmd->se_tfo->get_cmd_state(cmd),
4750 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4751 BUG();
4752 }
4753
4754 goto get_cmd;
4755 }
4756
4757out:
ce8762f6
NB		 4758 WARN_ON(!list_empty(&dev->state_task_list));
4759 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4760 dev->process_thread = NULL;
4761 return 0;
4762}