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target: remove the se_task task_error_status field
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
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);
c66ac9db
NB		 71static int __transport_execute_tasks(struct se_device *dev);
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
6708bb27 424 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 425 continue;
426
427 spin_lock_irqsave(&dev->execute_task_lock, flags);
428 list_del(&task->t_state_list);
6708bb27
AG		 429 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
430 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 431 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
432
433 atomic_set(&task->task_state_active, 0);
a1d8b49a 434 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 435 }
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
NB		 693 unsigned long flags;
694#if 0
6708bb27 695 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 696 cmd->t_task_cdb[0], dev);
c66ac9db 697#endif
e3d6f909 698 if (dev)
c66ac9db 699 atomic_inc(&dev->depth_left);
c66ac9db 700
a1d8b49a 701 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 702 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 703
704 /*
705 * See if any sense data exists, if so set the TASK_SENSE flag.
706 * Also check for any other post completion work that needs to be
707 * done by the plugins.
708 */
709 if (dev && dev->transport->transport_complete) {
710 if (dev->transport->transport_complete(task) != 0) {
711 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
ef804a84 712 task->task_flags |= TF_HAS_SENSE;
c66ac9db
NB		 713 success = 1;
714 }
715 }
716
717 /*
718 * See if we are waiting for outstanding struct se_task
719 * to complete for an exception condition
720 */
6c76bf95 721 if (task->task_flags & TF_REQUEST_STOP) {
a1d8b49a 722 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 723 complete(&task->task_stop_comp);
724 return;
725 }
2235007c
CH		 726
727 if (!success)
728 cmd->t_tasks_failed = 1;
729
c66ac9db
NB		 730 /*
731 * Decrement the outstanding t_task_cdbs_left count. The last
732 * struct se_task from struct se_cmd will complete itself into the
733 * device queue depending upon int success.
734 */
6708bb27 735 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
a1d8b49a 736 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 737 return;
738 }
739
2235007c 740 if (cmd->t_tasks_failed) {
41e16e98 741 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 742 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 743 } else {
a1d8b49a 744 atomic_set(&cmd->t_transport_complete, 1);
35e0e757 745 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 746 }
35e0e757 747
35e0e757
CH		 748 cmd->t_state = TRANSPORT_COMPLETE;
749 atomic_set(&cmd->t_transport_active, 1);
a1d8b49a 750 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 751
35e0e757 752 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 753}
754EXPORT_SYMBOL(transport_complete_task);
755
756/*
757 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
758 * struct se_task list are ready to be added to the active execution list
759 * struct se_device
760
761 * Called with se_dev_t->execute_task_lock called.
762 */
763static inline int transport_add_task_check_sam_attr(
764 struct se_task *task,
765 struct se_task *task_prev,
766 struct se_device *dev)
767{
768 /*
769 * No SAM Task attribute emulation enabled, add to tail of
770 * execution queue
771 */
772 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
773 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
774 return 0;
775 }
776 /*
777 * HEAD_OF_QUEUE attribute for received CDB, which means
778 * the first task that is associated with a struct se_cmd goes to
779 * head of the struct se_device->execute_task_list, and task_prev
780 * after that for each subsequent task
781 */
e66ecd50 782 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 783 list_add(&task->t_execute_list,
784 (task_prev != NULL) ?
785 &task_prev->t_execute_list :
786 &dev->execute_task_list);
787
6708bb27 788 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 789 " in execution queue\n",
6708bb27 790 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 791 return 1;
792 }
793 /*
794 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
795 * transitioned from Dermant -> Active state, and are added to the end
796 * of the struct se_device->execute_task_list
797 */
798 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
799 return 0;
800}
801
802/* __transport_add_task_to_execute_queue():
803 *
804 * Called with se_dev_t->execute_task_lock called.
805 */
806static void __transport_add_task_to_execute_queue(
807 struct se_task *task,
808 struct se_task *task_prev,
809 struct se_device *dev)
810{
811 int head_of_queue;
812
813 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
814 atomic_inc(&dev->execute_tasks);
815
816 if (atomic_read(&task->task_state_active))
817 return;
818 /*
819 * Determine if this task needs to go to HEAD_OF_QUEUE for the
820 * state list as well. Running with SAM Task Attribute emulation
821 * will always return head_of_queue == 0 here
822 */
823 if (head_of_queue)
824 list_add(&task->t_state_list, (task_prev) ?
825 &task_prev->t_state_list :
826 &dev->state_task_list);
827 else
828 list_add_tail(&task->t_state_list, &dev->state_task_list);
829
830 atomic_set(&task->task_state_active, 1);
831
6708bb27 832 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 833 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 834 task, dev);
835}
836
837static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
838{
42bf829e 839 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 840 struct se_task *task;
841 unsigned long flags;
842
a1d8b49a
AG		 843 spin_lock_irqsave(&cmd->t_state_lock, flags);
844 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 845 if (atomic_read(&task->task_state_active))
846 continue;
847
848 spin_lock(&dev->execute_task_lock);
849 list_add_tail(&task->t_state_list, &dev->state_task_list);
850 atomic_set(&task->task_state_active, 1);
851
6708bb27
AG		 852 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
853 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 854 task->task_se_cmd), task, dev);
855
856 spin_unlock(&dev->execute_task_lock);
857 }
a1d8b49a 858 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 859}
860
861static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
862{
5951146d 863 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 864 struct se_task *task, *task_prev = NULL;
865 unsigned long flags;
866
867 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 868 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 869 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 870 continue;
871 /*
872 * __transport_add_task_to_execute_queue() handles the
873 * SAM Task Attribute emulation if enabled
874 */
875 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 876 task_prev = task;
877 }
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
975 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
976 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
977 dev->queue_depth);
978 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 979 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 980 *bl += sprintf(b + *bl, " ");
981}
982
c66ac9db
NB		 983void transport_dump_vpd_proto_id(
984 struct t10_vpd *vpd,
985 unsigned char *p_buf,
986 int p_buf_len)
987{
988 unsigned char buf[VPD_TMP_BUF_SIZE];
989 int len;
990
991 memset(buf, 0, VPD_TMP_BUF_SIZE);
992 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
993
994 switch (vpd->protocol_identifier) {
995 case 0x00:
996 sprintf(buf+len, "Fibre Channel\n");
997 break;
998 case 0x10:
999 sprintf(buf+len, "Parallel SCSI\n");
1000 break;
1001 case 0x20:
1002 sprintf(buf+len, "SSA\n");
1003 break;
1004 case 0x30:
1005 sprintf(buf+len, "IEEE 1394\n");
1006 break;
1007 case 0x40:
1008 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1009 " Protocol\n");
1010 break;
1011 case 0x50:
1012 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1013 break;
1014 case 0x60:
1015 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1016 break;
1017 case 0x70:
1018 sprintf(buf+len, "Automation/Drive Interface Transport"
1019 " Protocol\n");
1020 break;
1021 case 0x80:
1022 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1023 break;
1024 default:
1025 sprintf(buf+len, "Unknown 0x%02x\n",
1026 vpd->protocol_identifier);
1027 break;
1028 }
1029
1030 if (p_buf)
1031 strncpy(p_buf, buf, p_buf_len);
1032 else
6708bb27 1033 pr_debug("%s", buf);
c66ac9db
NB		 1034}
1035
1036void
1037transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1038{
1039 /*
1040 * Check if the Protocol Identifier Valid (PIV) bit is set..
1041 *
1042 * from spc3r23.pdf section 7.5.1
1043 */
1044 if (page_83[1] & 0x80) {
1045 vpd->protocol_identifier = (page_83[0] & 0xf0);
1046 vpd->protocol_identifier_set = 1;
1047 transport_dump_vpd_proto_id(vpd, NULL, 0);
1048 }
1049}
1050EXPORT_SYMBOL(transport_set_vpd_proto_id);
1051
1052int transport_dump_vpd_assoc(
1053 struct t10_vpd *vpd,
1054 unsigned char *p_buf,
1055 int p_buf_len)
1056{
1057 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1058 int ret = 0;
1059 int len;
c66ac9db
NB		 1060
1061 memset(buf, 0, VPD_TMP_BUF_SIZE);
1062 len = sprintf(buf, "T10 VPD Identifier Association: ");
1063
1064 switch (vpd->association) {
1065 case 0x00:
1066 sprintf(buf+len, "addressed logical unit\n");
1067 break;
1068 case 0x10:
1069 sprintf(buf+len, "target port\n");
1070 break;
1071 case 0x20:
1072 sprintf(buf+len, "SCSI target device\n");
1073 break;
1074 default:
1075 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1076 ret = -EINVAL;
c66ac9db
NB		 1077 break;
1078 }
1079
1080 if (p_buf)
1081 strncpy(p_buf, buf, p_buf_len);
1082 else
6708bb27 1083 pr_debug("%s", buf);
c66ac9db
NB		 1084
1085 return ret;
1086}
1087
1088int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1089{
1090 /*
1091 * The VPD identification association..
1092 *
1093 * from spc3r23.pdf Section 7.6.3.1 Table 297
1094 */
1095 vpd->association = (page_83[1] & 0x30);
1096 return transport_dump_vpd_assoc(vpd, NULL, 0);
1097}
1098EXPORT_SYMBOL(transport_set_vpd_assoc);
1099
1100int transport_dump_vpd_ident_type(
1101 struct t10_vpd *vpd,
1102 unsigned char *p_buf,
1103 int p_buf_len)
1104{
1105 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1106 int ret = 0;
1107 int len;
c66ac9db
NB		 1108
1109 memset(buf, 0, VPD_TMP_BUF_SIZE);
1110 len = sprintf(buf, "T10 VPD Identifier Type: ");
1111
1112 switch (vpd->device_identifier_type) {
1113 case 0x00:
1114 sprintf(buf+len, "Vendor specific\n");
1115 break;
1116 case 0x01:
1117 sprintf(buf+len, "T10 Vendor ID based\n");
1118 break;
1119 case 0x02:
1120 sprintf(buf+len, "EUI-64 based\n");
1121 break;
1122 case 0x03:
1123 sprintf(buf+len, "NAA\n");
1124 break;
1125 case 0x04:
1126 sprintf(buf+len, "Relative target port identifier\n");
1127 break;
1128 case 0x08:
1129 sprintf(buf+len, "SCSI name string\n");
1130 break;
1131 default:
1132 sprintf(buf+len, "Unsupported: 0x%02x\n",
1133 vpd->device_identifier_type);
e3d6f909 1134 ret = -EINVAL;
c66ac9db
NB		 1135 break;
1136 }
1137
e3d6f909
AG		 1138 if (p_buf) {
1139 if (p_buf_len < strlen(buf)+1)
1140 return -EINVAL;
c66ac9db 1141 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1142 } else {
6708bb27 1143 pr_debug("%s", buf);
e3d6f909 1144 }
c66ac9db
NB		 1145
1146 return ret;
1147}
1148
1149int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1150{
1151 /*
1152 * The VPD identifier type..
1153 *
1154 * from spc3r23.pdf Section 7.6.3.1 Table 298
1155 */
1156 vpd->device_identifier_type = (page_83[1] & 0x0f);
1157 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1158}
1159EXPORT_SYMBOL(transport_set_vpd_ident_type);
1160
1161int transport_dump_vpd_ident(
1162 struct t10_vpd *vpd,
1163 unsigned char *p_buf,
1164 int p_buf_len)
1165{
1166 unsigned char buf[VPD_TMP_BUF_SIZE];
1167 int ret = 0;
1168
1169 memset(buf, 0, VPD_TMP_BUF_SIZE);
1170
1171 switch (vpd->device_identifier_code_set) {
1172 case 0x01: /* Binary */
1173 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1174 &vpd->device_identifier[0]);
1175 break;
1176 case 0x02: /* ASCII */
1177 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1178 &vpd->device_identifier[0]);
1179 break;
1180 case 0x03: /* UTF-8 */
1181 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1182 &vpd->device_identifier[0]);
1183 break;
1184 default:
1185 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1186 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1187 ret = -EINVAL;
c66ac9db
NB		 1188 break;
1189 }
1190
1191 if (p_buf)
1192 strncpy(p_buf, buf, p_buf_len);
1193 else
6708bb27 1194 pr_debug("%s", buf);
c66ac9db
NB		 1195
1196 return ret;
1197}
1198
1199int
1200transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1201{
1202 static const char hex_str[] = "0123456789abcdef";
1203 int j = 0, i = 4; /* offset to start of the identifer */
1204
1205 /*
1206 * The VPD Code Set (encoding)
1207 *
1208 * from spc3r23.pdf Section 7.6.3.1 Table 296
1209 */
1210 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1211 switch (vpd->device_identifier_code_set) {
1212 case 0x01: /* Binary */
1213 vpd->device_identifier[j++] =
1214 hex_str[vpd->device_identifier_type];
1215 while (i < (4 + page_83[3])) {
1216 vpd->device_identifier[j++] =
1217 hex_str[(page_83[i] & 0xf0) >> 4];
1218 vpd->device_identifier[j++] =
1219 hex_str[page_83[i] & 0x0f];
1220 i++;
1221 }
1222 break;
1223 case 0x02: /* ASCII */
1224 case 0x03: /* UTF-8 */
1225 while (i < (4 + page_83[3]))
1226 vpd->device_identifier[j++] = page_83[i++];
1227 break;
1228 default:
1229 break;
1230 }
1231
1232 return transport_dump_vpd_ident(vpd, NULL, 0);
1233}
1234EXPORT_SYMBOL(transport_set_vpd_ident);
1235
1236static void core_setup_task_attr_emulation(struct se_device *dev)
1237{
1238 /*
1239 * If this device is from Target_Core_Mod/pSCSI, disable the
1240 * SAM Task Attribute emulation.
1241 *
1242 * This is currently not available in upsream Linux/SCSI Target
1243 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1244 */
e3d6f909 1245 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1246 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1247 return;
1248 }
1249
1250 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1251 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1252 " device\n", dev->transport->name,
1253 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1254}
1255
1256static void scsi_dump_inquiry(struct se_device *dev)
1257{
e3d6f909 1258 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1259 int i, device_type;
1260 /*
1261 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1262 */
6708bb27 1263 pr_debug(" Vendor: ");
c66ac9db
NB		 1264 for (i = 0; i < 8; i++)
1265 if (wwn->vendor[i] >= 0x20)
6708bb27 1266 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1267 else
6708bb27 1268 pr_debug(" ");
c66ac9db 1269
6708bb27 1270 pr_debug(" Model: ");
c66ac9db
NB		 1271 for (i = 0; i < 16; i++)
1272 if (wwn->model[i] >= 0x20)
6708bb27 1273 pr_debug("%c", wwn->model[i]);
c66ac9db 1274 else
6708bb27 1275 pr_debug(" ");
c66ac9db 1276
6708bb27 1277 pr_debug(" Revision: ");
c66ac9db
NB		 1278 for (i = 0; i < 4; i++)
1279 if (wwn->revision[i] >= 0x20)
6708bb27 1280 pr_debug("%c", wwn->revision[i]);
c66ac9db 1281 else
6708bb27 1282 pr_debug(" ");
c66ac9db 1283
6708bb27 1284 pr_debug("\n");
c66ac9db 1285
e3d6f909 1286 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1287 pr_debug(" Type: %s ", scsi_device_type(device_type));
1288 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1289 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1290}
1291
1292struct se_device *transport_add_device_to_core_hba(
1293 struct se_hba *hba,
1294 struct se_subsystem_api *transport,
1295 struct se_subsystem_dev *se_dev,
1296 u32 device_flags,
1297 void *transport_dev,
1298 struct se_dev_limits *dev_limits,
1299 const char *inquiry_prod,
1300 const char *inquiry_rev)
1301{
12a18bdc 1302 int force_pt;
c66ac9db
NB		 1303 struct se_device *dev;
1304
1305 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1306 if (!dev) {
1307 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1308 return NULL;
1309 }
c66ac9db 1310
e3d6f909 1311 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1312 dev->dev_flags = device_flags;
1313 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1314 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1315 dev->se_hba = hba;
1316 dev->se_sub_dev = se_dev;
1317 dev->transport = transport;
c66ac9db
NB		 1318 INIT_LIST_HEAD(&dev->dev_list);
1319 INIT_LIST_HEAD(&dev->dev_sep_list);
1320 INIT_LIST_HEAD(&dev->dev_tmr_list);
1321 INIT_LIST_HEAD(&dev->execute_task_list);
1322 INIT_LIST_HEAD(&dev->delayed_cmd_list);
c66ac9db 1323 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1324 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1325 spin_lock_init(&dev->execute_task_lock);
1326 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1327 spin_lock_init(&dev->dev_reservation_lock);
1328 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1329 spin_lock_init(&dev->se_port_lock);
1330 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1331 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1332
1333 dev->queue_depth = dev_limits->queue_depth;
1334 atomic_set(&dev->depth_left, dev->queue_depth);
1335 atomic_set(&dev->dev_ordered_id, 0);
1336
1337 se_dev_set_default_attribs(dev, dev_limits);
1338
1339 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1340 dev->creation_time = get_jiffies_64();
1341 spin_lock_init(&dev->stats_lock);
1342
1343 spin_lock(&hba->device_lock);
1344 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1345 hba->dev_count++;
1346 spin_unlock(&hba->device_lock);
1347 /*
1348 * Setup the SAM Task Attribute emulation for struct se_device
1349 */
1350 core_setup_task_attr_emulation(dev);
1351 /*
1352 * Force PR and ALUA passthrough emulation with internal object use.
1353 */
1354 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1355 /*
1356 * Setup the Reservations infrastructure for struct se_device
1357 */
1358 core_setup_reservations(dev, force_pt);
1359 /*
1360 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1361 */
1362 if (core_setup_alua(dev, force_pt) < 0)
1363 goto out;
1364
1365 /*
1366 * Startup the struct se_device processing thread
1367 */
1368 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1369 "LIO_%s", dev->transport->name);
c66ac9db 1370 if (IS_ERR(dev->process_thread)) {
6708bb27 1371 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1372 dev->transport->name);
c66ac9db
NB		 1373 goto out;
1374 }
07bde79a
NB		 1375 /*
1376 * Setup work_queue for QUEUE_FULL
1377 */
1378 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1379 /*
1380 * Preload the initial INQUIRY const values if we are doing
1381 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1382 * passthrough because this is being provided by the backend LLD.
1383 * This is required so that transport_get_inquiry() copies these
1384 * originals once back into DEV_T10_WWN(dev) for the virtual device
1385 * setup.
1386 */
e3d6f909 1387 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1388 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1389 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1390 " INQUIRY consts\n");
1391 goto out;
1392 }
1393
e3d6f909
AG		 1394 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1395 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1396 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1397 }
1398 scsi_dump_inquiry(dev);
1399
12a18bdc 1400 return dev;
c66ac9db 1401out:
c66ac9db
NB		 1402 kthread_stop(dev->process_thread);
1403
1404 spin_lock(&hba->device_lock);
1405 list_del(&dev->dev_list);
1406 hba->dev_count--;
1407 spin_unlock(&hba->device_lock);
1408
1409 se_release_vpd_for_dev(dev);
1410
c66ac9db
NB		 1411 kfree(dev);
1412
1413 return NULL;
1414}
1415EXPORT_SYMBOL(transport_add_device_to_core_hba);
1416
1417/* transport_generic_prepare_cdb():
1418 *
1419 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1420 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1421 * The point of this is since we are mapping iSCSI LUNs to
1422 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1423 * devices and HBAs for a loop.
1424 */
1425static inline void transport_generic_prepare_cdb(
1426 unsigned char *cdb)
1427{
1428 switch (cdb[0]) {
1429 case READ_10: /* SBC - RDProtect */
1430 case READ_12: /* SBC - RDProtect */
1431 case READ_16: /* SBC - RDProtect */
1432 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1433 case VERIFY: /* SBC - VRProtect */
1434 case VERIFY_16: /* SBC - VRProtect */
1435 case WRITE_VERIFY: /* SBC - VRProtect */
1436 case WRITE_VERIFY_12: /* SBC - VRProtect */
1437 break;
1438 default:
1439 cdb[1] &= 0x1f; /* clear logical unit number */
1440 break;
1441 }
1442}
1443
1444static struct se_task *
1445transport_generic_get_task(struct se_cmd *cmd,
1446 enum dma_data_direction data_direction)
1447{
1448 struct se_task *task;
5951146d 1449 struct se_device *dev = cmd->se_dev;
c66ac9db 1450
6708bb27 1451 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1452 if (!task) {
6708bb27 1453 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1454 return NULL;
1455 }
1456
1457 INIT_LIST_HEAD(&task->t_list);
1458 INIT_LIST_HEAD(&task->t_execute_list);
1459 INIT_LIST_HEAD(&task->t_state_list);
1460 init_completion(&task->task_stop_comp);
c66ac9db 1461 task->task_se_cmd = cmd;
c66ac9db
NB		 1462 task->task_data_direction = data_direction;
1463
c66ac9db
NB		 1464 return task;
1465}
1466
1467static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1468
c66ac9db
NB		 1469/*
1470 * Used by fabric modules containing a local struct se_cmd within their
1471 * fabric dependent per I/O descriptor.
1472 */
1473void transport_init_se_cmd(
1474 struct se_cmd *cmd,
1475 struct target_core_fabric_ops *tfo,
1476 struct se_session *se_sess,
1477 u32 data_length,
1478 int data_direction,
1479 int task_attr,
1480 unsigned char *sense_buffer)
1481{
5951146d
AG		 1482 INIT_LIST_HEAD(&cmd->se_lun_node);
1483 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1484 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1485 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1486 INIT_LIST_HEAD(&cmd->se_cmd_list);
a1d8b49a
AG		 1487 INIT_LIST_HEAD(&cmd->t_task_list);
1488 init_completion(&cmd->transport_lun_fe_stop_comp);
1489 init_completion(&cmd->transport_lun_stop_comp);
1490 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1491 init_completion(&cmd->cmd_wait_comp);
a1d8b49a
AG		 1492 spin_lock_init(&cmd->t_state_lock);
1493 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1494
1495 cmd->se_tfo = tfo;
1496 cmd->se_sess = se_sess;
1497 cmd->data_length = data_length;
1498 cmd->data_direction = data_direction;
1499 cmd->sam_task_attr = task_attr;
1500 cmd->sense_buffer = sense_buffer;
1501}
1502EXPORT_SYMBOL(transport_init_se_cmd);
1503
1504static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1505{
1506 /*
1507 * Check if SAM Task Attribute emulation is enabled for this
1508 * struct se_device storage object
1509 */
5951146d 1510 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1511 return 0;
1512
e66ecd50 1513 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1514 pr_debug("SAM Task Attribute ACA"
c66ac9db 1515 " emulation is not supported\n");
e3d6f909 1516 return -EINVAL;
c66ac9db
NB		 1517 }
1518 /*
1519 * Used to determine when ORDERED commands should go from
1520 * Dormant to Active status.
1521 */
5951146d 1522 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1523 smp_mb__after_atomic_inc();
6708bb27 1524 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1525 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1526 cmd->se_dev->transport->name);
c66ac9db
NB		 1527 return 0;
1528}
1529
c66ac9db
NB		 1530/* transport_generic_allocate_tasks():
1531 *
1532 * Called from fabric RX Thread.
1533 */
1534int transport_generic_allocate_tasks(
1535 struct se_cmd *cmd,
1536 unsigned char *cdb)
1537{
1538 int ret;
1539
1540 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1541 /*
1542 * Ensure that the received CDB is less than the max (252 + 8) bytes
1543 * for VARIABLE_LENGTH_CMD
1544 */
1545 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1546 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1547 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1548 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1549 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1550 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1551 return -EINVAL;
c66ac9db
NB		 1552 }
1553 /*
1554 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1555 * allocate the additional extended CDB buffer now.. Otherwise
1556 * setup the pointer from __t_task_cdb to t_task_cdb.
1557 */
a1d8b49a
AG		 1558 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1559 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1560 GFP_KERNEL);
6708bb27
AG		 1561 if (!cmd->t_task_cdb) {
1562 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1563 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1564 scsi_command_size(cdb),
a1d8b49a 1565 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1566 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1567 cmd->scsi_sense_reason =
1568 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1569 return -ENOMEM;
c66ac9db
NB		 1570 }
1571 } else
a1d8b49a 1572 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1573 /*
a1d8b49a 1574 * Copy the original CDB into cmd->
c66ac9db 1575 */
a1d8b49a 1576 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1577 /*
1578 * Setup the received CDB based on SCSI defined opcodes and
1579 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1580 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1581 * pointer is expected to be setup before we reach this point.
1582 */
1583 ret = transport_generic_cmd_sequencer(cmd, cdb);
1584 if (ret < 0)
1585 return ret;
1586 /*
1587 * Check for SAM Task Attribute Emulation
1588 */
1589 if (transport_check_alloc_task_attr(cmd) < 0) {
1590 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1591 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1592 return -EINVAL;
c66ac9db
NB		 1593 }
1594 spin_lock(&cmd->se_lun->lun_sep_lock);
1595 if (cmd->se_lun->lun_sep)
1596 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1597 spin_unlock(&cmd->se_lun->lun_sep_lock);
1598 return 0;
1599}
1600EXPORT_SYMBOL(transport_generic_allocate_tasks);
1601
695434e1
NB		 1602/*
1603 * Used by fabric module frontends to queue tasks directly.
1604 * Many only be used from process context only
1605 */
1606int transport_handle_cdb_direct(
1607 struct se_cmd *cmd)
1608{
dd8ae59d
NB		 1609 int ret;
1610
695434e1
NB		 1611 if (!cmd->se_lun) {
1612 dump_stack();
6708bb27 1613 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1614 return -EINVAL;
1615 }
1616 if (in_interrupt()) {
1617 dump_stack();
6708bb27 1618 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1619 " from interrupt context\n");
1620 return -EINVAL;
1621 }
dd8ae59d
NB		 1622 /*
1623 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1624 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1625 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1626 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1627 *
1628 * Also, we don't take cmd->t_state_lock here as we only expect
1629 * this to be called for initial descriptor submission.
1630 */
1631 cmd->t_state = TRANSPORT_NEW_CMD;
1632 atomic_set(&cmd->t_transport_active, 1);
1633 /*
1634 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1635 * so follow TRANSPORT_NEW_CMD processing thread context usage
1636 * and call transport_generic_request_failure() if necessary..
1637 */
1638 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1639 if (ret < 0)
1640 transport_generic_request_failure(cmd);
1641
dd8ae59d 1642 return 0;
695434e1
NB		 1643}
1644EXPORT_SYMBOL(transport_handle_cdb_direct);
1645
c66ac9db
NB		 1646/*
1647 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1648 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1649 * complete setup in TCM process context w/ TFO->new_cmd_map().
1650 */
1651int transport_generic_handle_cdb_map(
1652 struct se_cmd *cmd)
1653{
e3d6f909 1654 if (!cmd->se_lun) {
c66ac9db 1655 dump_stack();
6708bb27 1656 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1657 return -EINVAL;
c66ac9db
NB		 1658 }
1659
f7a5cc0b 1660 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1661 return 0;
1662}
1663EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1664
1665/* transport_generic_handle_data():
1666 *
1667 *
1668 */
1669int transport_generic_handle_data(
1670 struct se_cmd *cmd)
1671{
1672 /*
1673 * For the software fabric case, then we assume the nexus is being
1674 * failed/shutdown when signals are pending from the kthread context
1675 * caller, so we return a failure. For the HW target mode case running
1676 * in interrupt code, the signal_pending() check is skipped.
1677 */
1678 if (!in_interrupt() && signal_pending(current))
e3d6f909 1679 return -EPERM;
c66ac9db
NB		 1680 /*
1681 * If the received CDB has aleady been ABORTED by the generic
1682 * target engine, we now call transport_check_aborted_status()
1683 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1684 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1685 * sequences at this point.
1686 */
1687 if (transport_check_aborted_status(cmd, 1) != 0)
1688 return 0;
1689
f7a5cc0b 1690 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1691 return 0;
1692}
1693EXPORT_SYMBOL(transport_generic_handle_data);
1694
1695/* transport_generic_handle_tmr():
1696 *
1697 *
1698 */
1699int transport_generic_handle_tmr(
1700 struct se_cmd *cmd)
1701{
f7a5cc0b 1702 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1703 return 0;
1704}
1705EXPORT_SYMBOL(transport_generic_handle_tmr);
1706
cdbb70bb
CH		 1707/*
1708 * If the task is active, request it to be stopped and sleep until it
1709 * has completed.
1710 */
1711bool target_stop_task(struct se_task *task, unsigned long *flags)
1712{
1713 struct se_cmd *cmd = task->task_se_cmd;
1714 bool was_active = false;
1715
1716 if (task->task_flags & TF_ACTIVE) {
1717 task->task_flags |= TF_REQUEST_STOP;
1718 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1719
1720 pr_debug("Task %p waiting to complete\n", task);
1721 wait_for_completion(&task->task_stop_comp);
1722 pr_debug("Task %p stopped successfully\n", task);
1723
1724 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1725 atomic_dec(&cmd->t_task_cdbs_left);
1726 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1727 was_active = true;
1728 }
1729
cdbb70bb
CH		 1730 return was_active;
1731}
1732
c66ac9db
NB		 1733static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1734{
1735 struct se_task *task, *task_tmp;
1736 unsigned long flags;
1737 int ret = 0;
1738
6708bb27 1739 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1740 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1741
1742 /*
1743 * No tasks remain in the execution queue
1744 */
a1d8b49a 1745 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1746 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1747 &cmd->t_task_list, t_list) {
04629b7b 1748 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1749 /*
1750 * If the struct se_task has not been sent and is not active,
1751 * remove the struct se_task from the execution queue.
1752 */
6c76bf95 1753 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1754 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1755 flags);
1756 transport_remove_task_from_execute_queue(task,
42bf829e 1757 cmd->se_dev);
c66ac9db 1758
04629b7b 1759 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1760 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1761 continue;
1762 }
1763
cdbb70bb 1764 if (!target_stop_task(task, &flags)) {
04629b7b 1765 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1766 ret++;
1767 }
c66ac9db 1768 }
a1d8b49a 1769 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1770
1771 return ret;
1772}
1773
c66ac9db
NB		 1774/*
1775 * Handle SAM-esque emulation for generic transport request failures.
1776 */
03e98c9e 1777static void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1778{
07bde79a
NB		 1779 int ret = 0;
1780
6708bb27 1781 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1782 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1783 cmd->t_task_cdb[0]);
03e98c9e 1784 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1785 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1786 cmd->t_state, cmd->scsi_sense_reason);
6708bb27 1787 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1788 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1789 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1790 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1791 atomic_read(&cmd->t_task_cdbs_left),
1792 atomic_read(&cmd->t_task_cdbs_sent),
1793 atomic_read(&cmd->t_task_cdbs_ex_left),
1794 atomic_read(&cmd->t_transport_active),
1795 atomic_read(&cmd->t_transport_stop),
1796 atomic_read(&cmd->t_transport_sent));
c66ac9db 1797
c66ac9db
NB		 1798 /*
1799 * For SAM Task Attribute emulation for failed struct se_cmd
1800 */
1801 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1802 transport_complete_task_attr(cmd);
1803
03e98c9e
NB		 1804 switch (cmd->scsi_sense_reason) {
1805 case TCM_NON_EXISTENT_LUN:
1806 case TCM_UNSUPPORTED_SCSI_OPCODE:
1807 case TCM_INVALID_CDB_FIELD:
1808 case TCM_INVALID_PARAMETER_LIST:
1809 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1810 case TCM_UNKNOWN_MODE_PAGE:
1811 case TCM_WRITE_PROTECTED:
1812 case TCM_CHECK_CONDITION_ABORT_CMD:
1813 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1814 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1815 break;
03e98c9e 1816 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1817 /*
1818 * No SENSE Data payload for this case, set SCSI Status
1819 * and queue the response to $FABRIC_MOD.
1820 *
1821 * Uses linux/include/scsi/scsi.h SAM status codes defs
1822 */
1823 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1824 /*
1825 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1826 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1827 * CONFLICT STATUS.
1828 *
1829 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1830 */
e3d6f909
AG		 1831 if (cmd->se_sess &&
1832 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1833 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1834 cmd->orig_fe_lun, 0x2C,
1835 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1836
07bde79a 1837 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1838 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1839 goto queue_full;
c66ac9db 1840 goto check_stop;
c66ac9db 1841 default:
6708bb27 1842 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1843 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1844 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1845 break;
1846 }
16ab8e60
NB		 1847 /*
1848 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1849 * make the call to transport_send_check_condition_and_sense()
1850 * directly. Otherwise expect the fabric to make the call to
1851 * transport_send_check_condition_and_sense() after handling
1852 * possible unsoliticied write data payloads.
1853 */
03e98c9e
NB		 1854 ret = transport_send_check_condition_and_sense(cmd,
1855 cmd->scsi_sense_reason, 0);
1856 if (ret == -EAGAIN || ret == -ENOMEM)
1857 goto queue_full;
07bde79a 1858
c66ac9db
NB		 1859check_stop:
1860 transport_lun_remove_cmd(cmd);
6708bb27 1861 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1862 ;
07bde79a
NB		 1863 return;
1864
1865queue_full:
e057f533
CH		 1866 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1867 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1868}
1869
c66ac9db
NB		 1870static inline u32 transport_lba_21(unsigned char *cdb)
1871{
1872 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1873}
1874
1875static inline u32 transport_lba_32(unsigned char *cdb)
1876{
1877 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1878}
1879
1880static inline unsigned long long transport_lba_64(unsigned char *cdb)
1881{
1882 unsigned int __v1, __v2;
1883
1884 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1885 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1886
1887 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1888}
1889
1890/*
1891 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1892 */
1893static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1894{
1895 unsigned int __v1, __v2;
1896
1897 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1898 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1899
1900 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1901}
1902
1903static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1904{
1905 unsigned long flags;
1906
a1d8b49a 1907 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 1908 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 1909 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 1910}
1911
c66ac9db
NB		 1912static inline int transport_tcq_window_closed(struct se_device *dev)
1913{
1914 if (dev->dev_tcq_window_closed++ <
1915 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1916 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1917 } else
1918 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1919
e3d6f909 1920 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 1921 return 0;
1922}
1923
1924/*
1925 * Called from Fabric Module context from transport_execute_tasks()
1926 *
1927 * The return of this function determins if the tasks from struct se_cmd
1928 * get added to the execution queue in transport_execute_tasks(),
1929 * or are added to the delayed or ordered lists here.
1930 */
1931static inline int transport_execute_task_attr(struct se_cmd *cmd)
1932{
5951146d 1933 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1934 return 1;
1935 /*
25985edc 1936 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1937 * to allow the passed struct se_cmd list of tasks to the front of the list.
1938 */
e66ecd50 1939 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
6708bb27 1940 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 1941 " 0x%02x, se_ordered_id: %u\n",
6708bb27 1942 cmd->t_task_cdb[0],
c66ac9db
NB		 1943 cmd->se_ordered_id);
1944 return 1;
e66ecd50 1945 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d 1946 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 1947 smp_mb__after_atomic_inc();
1948
6708bb27 1949 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 1950 " list, se_ordered_id: %u\n",
a1d8b49a 1951 cmd->t_task_cdb[0],
c66ac9db
NB		 1952 cmd->se_ordered_id);
1953 /*
1954 * Add ORDERED command to tail of execution queue if
1955 * no other older commands exist that need to be
1956 * completed first.
1957 */
6708bb27 1958 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 1959 return 1;
1960 } else {
1961 /*
1962 * For SIMPLE and UNTAGGED Task Attribute commands
1963 */
5951146d 1964 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 1965 smp_mb__after_atomic_inc();
1966 }
1967 /*
1968 * Otherwise if one or more outstanding ORDERED task attribute exist,
1969 * add the dormant task(s) built for the passed struct se_cmd to the
1970 * execution queue and become in Active state for this struct se_device.
1971 */
5951146d 1972 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 1973 /*
1974 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 1975 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 1976 */
5951146d 1977 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 1978 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 1979 list_add_tail(&cmd->se_delayed_node,
1980 &cmd->se_dev->delayed_cmd_list);
1981 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 1982
6708bb27 1983 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 1984 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 1985 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 1986 cmd->se_ordered_id);
1987 /*
1988 * Return zero to let transport_execute_tasks() know
1989 * not to add the delayed tasks to the execution list.
1990 */
1991 return 0;
1992 }
1993 /*
1994 * Otherwise, no ORDERED task attributes exist..
1995 */
1996 return 1;
1997}
1998
1999/*
2000 * Called from fabric module context in transport_generic_new_cmd() and
2001 * transport_generic_process_write()
2002 */
2003static int transport_execute_tasks(struct se_cmd *cmd)
2004{
2005 int add_tasks;
2006
58a2801a 2007 if (se_dev_check_online(cmd->se_dev) != 0) {
03e98c9e
NB		 2008 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2009 transport_generic_request_failure(cmd);
db1620a2 2010 return 0;
c66ac9db 2011 }
db1620a2 2012
c66ac9db
NB		 2013 /*
2014 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2015 * has occurred that prevents execution.
c66ac9db 2016 */
6708bb27 2017 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2018 /*
2019 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2020 * attribute for the tasks of the received struct se_cmd CDB
2021 */
2022 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2023 if (!add_tasks)
c66ac9db
NB		 2024 goto execute_tasks;
2025 /*
2026 * This calls transport_add_tasks_from_cmd() to handle
2027 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2028 * (if enabled) in __transport_add_task_to_execute_queue() and
2029 * transport_add_task_check_sam_attr().
2030 */
2031 transport_add_tasks_from_cmd(cmd);
2032 }
2033 /*
2034 * Kick the execution queue for the cmd associated struct se_device
2035 * storage object.
2036 */
2037execute_tasks:
5951146d 2038 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2039 return 0;
2040}
2041
2042/*
2043 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2044 * from struct se_device->execute_task_list and
2045 *
2046 * Called from transport_processing_thread()
2047 */
2048static int __transport_execute_tasks(struct se_device *dev)
2049{
2050 int error;
2051 struct se_cmd *cmd = NULL;
e3d6f909 2052 struct se_task *task = NULL;
c66ac9db
NB		 2053 unsigned long flags;
2054
2055 /*
2056 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2057 * struct se_tasks to the selected transport.
c66ac9db
NB		 2058 */
2059check_depth:
e3d6f909 2060 if (!atomic_read(&dev->depth_left))
c66ac9db 2061 return transport_tcq_window_closed(dev);
c66ac9db 2062
e3d6f909 2063 dev->dev_tcq_window_closed = 0;
c66ac9db 2064
e3d6f909
AG		 2065 spin_lock_irq(&dev->execute_task_lock);
2066 if (list_empty(&dev->execute_task_list)) {
2067 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2068 return 0;
2069 }
e3d6f909
AG		 2070 task = list_first_entry(&dev->execute_task_list,
2071 struct se_task, t_execute_list);
04629b7b 2072 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2073 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2074
2075 atomic_dec(&dev->depth_left);
c66ac9db 2076
e3d6f909 2077 cmd = task->task_se_cmd;
c66ac9db 2078
a1d8b49a 2079 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2080 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2081 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2082
a1d8b49a
AG		 2083 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2084 cmd->t_task_list_num)
415a090a 2085 atomic_set(&cmd->t_transport_sent, 1);
c66ac9db 2086
a1d8b49a 2087 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2088
5bda90c8
CH		 2089 if (cmd->execute_task)
2090 error = cmd->execute_task(task);
2091 else
2092 error = dev->transport->do_task(task);
d29a5b6a 2093 if (error != 0) {
d29a5b6a
CH		 2094 spin_lock_irqsave(&cmd->t_state_lock, flags);
2095 task->task_flags &= ~TF_ACTIVE;
2096 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2097 atomic_set(&cmd->t_transport_sent, 0);
2098 transport_stop_tasks_for_cmd(cmd);
2099 atomic_inc(&dev->depth_left);
03e98c9e 2100 transport_generic_request_failure(cmd);
c66ac9db
NB		 2101 }
2102
2103 goto check_depth;
2104
2105 return 0;
2106}
2107
c66ac9db
NB		 2108static inline u32 transport_get_sectors_6(
2109 unsigned char *cdb,
2110 struct se_cmd *cmd,
2111 int *ret)
2112{
5951146d 2113 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2114
2115 /*
2116 * Assume TYPE_DISK for non struct se_device objects.
2117 * Use 8-bit sector value.
2118 */
2119 if (!dev)
2120 goto type_disk;
2121
2122 /*
2123 * Use 24-bit allocation length for TYPE_TAPE.
2124 */
e3d6f909 2125 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2126 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2127
2128 /*
2129 * Everything else assume TYPE_DISK Sector CDB location.
9b5cd7f3
RD		 2130 * Use 8-bit sector value. SBC-3 says:
2131 *
2132 * A TRANSFER LENGTH field set to zero specifies that 256
2133 * logical blocks shall be written. Any other value
2134 * specifies the number of logical blocks that shall be
2135 * written.
c66ac9db
NB		 2136 */
2137type_disk:
9b5cd7f3 2138 return cdb[4] ? : 256;
c66ac9db
NB		 2139}
2140
2141static inline u32 transport_get_sectors_10(
2142 unsigned char *cdb,
2143 struct se_cmd *cmd,
2144 int *ret)
2145{
5951146d 2146 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2147
2148 /*
2149 * Assume TYPE_DISK for non struct se_device objects.
2150 * Use 16-bit sector value.
2151 */
2152 if (!dev)
2153 goto type_disk;
2154
2155 /*
2156 * XXX_10 is not defined in SSC, throw an exception
2157 */
e3d6f909
AG		 2158 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2159 *ret = -EINVAL;
c66ac9db
NB		 2160 return 0;
2161 }
2162
2163 /*
2164 * Everything else assume TYPE_DISK Sector CDB location.
2165 * Use 16-bit sector value.
2166 */
2167type_disk:
2168 return (u32)(cdb[7] << 8) + cdb[8];
2169}
2170
2171static inline u32 transport_get_sectors_12(
2172 unsigned char *cdb,
2173 struct se_cmd *cmd,
2174 int *ret)
2175{
5951146d 2176 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2177
2178 /*
2179 * Assume TYPE_DISK for non struct se_device objects.
2180 * Use 32-bit sector value.
2181 */
2182 if (!dev)
2183 goto type_disk;
2184
2185 /*
2186 * XXX_12 is not defined in SSC, throw an exception
2187 */
e3d6f909
AG		 2188 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2189 *ret = -EINVAL;
c66ac9db
NB		 2190 return 0;
2191 }
2192
2193 /*
2194 * Everything else assume TYPE_DISK Sector CDB location.
2195 * Use 32-bit sector value.
2196 */
2197type_disk:
2198 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2199}
2200
2201static inline u32 transport_get_sectors_16(
2202 unsigned char *cdb,
2203 struct se_cmd *cmd,
2204 int *ret)
2205{
5951146d 2206 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2207
2208 /*
2209 * Assume TYPE_DISK for non struct se_device objects.
2210 * Use 32-bit sector value.
2211 */
2212 if (!dev)
2213 goto type_disk;
2214
2215 /*
2216 * Use 24-bit allocation length for TYPE_TAPE.
2217 */
e3d6f909 2218 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2219 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2220
2221type_disk:
2222 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2223 (cdb[12] << 8) + cdb[13];
2224}
2225
2226/*
2227 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2228 */
2229static inline u32 transport_get_sectors_32(
2230 unsigned char *cdb,
2231 struct se_cmd *cmd,
2232 int *ret)
2233{
2234 /*
2235 * Assume TYPE_DISK for non struct se_device objects.
2236 * Use 32-bit sector value.
2237 */
2238 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2239 (cdb[30] << 8) + cdb[31];
2240
2241}
2242
2243static inline u32 transport_get_size(
2244 u32 sectors,
2245 unsigned char *cdb,
2246 struct se_cmd *cmd)
2247{
5951146d 2248 struct se_device *dev = cmd->se_dev;
c66ac9db 2249
e3d6f909 2250 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2251 if (cdb[1] & 1) { /* sectors */
e3d6f909 2252 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2253 } else /* bytes */
2254 return sectors;
2255 }
2256#if 0
6708bb27 2257 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2258 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2259 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2260 dev->transport->name);
c66ac9db 2261#endif
e3d6f909 2262 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2263}
2264
c66ac9db
NB		 2265static void transport_xor_callback(struct se_cmd *cmd)
2266{
2267 unsigned char *buf, *addr;
ec98f782 2268 struct scatterlist *sg;
c66ac9db
NB		 2269 unsigned int offset;
2270 int i;
ec98f782 2271 int count;
c66ac9db
NB		 2272 /*
2273 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2274 *
2275 * 1) read the specified logical block(s);
2276 * 2) transfer logical blocks from the data-out buffer;
2277 * 3) XOR the logical blocks transferred from the data-out buffer with
2278 * the logical blocks read, storing the resulting XOR data in a buffer;
2279 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2280 * blocks transferred from the data-out buffer; and
2281 * 5) transfer the resulting XOR data to the data-in buffer.
2282 */
2283 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2284 if (!buf) {
2285 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2286 return;
2287 }
2288 /*
ec98f782 2289 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2290 * into the locally allocated *buf
2291 */
ec98f782
AG		 2292 sg_copy_to_buffer(cmd->t_data_sg,
2293 cmd->t_data_nents,
2294 buf,
2295 cmd->data_length);
2296
c66ac9db
NB		 2297 /*
2298 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2299 * cmd->t_mem_bidi_list
c66ac9db
NB		 2300 */
2301
2302 offset = 0;
ec98f782
AG		 2303 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2304 addr = kmap_atomic(sg_page(sg), KM_USER0);
2305 if (!addr)
c66ac9db
NB		 2306 goto out;
2307
ec98f782
AG		 2308 for (i = 0; i < sg->length; i++)
2309 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2310
ec98f782 2311 offset += sg->length;
c66ac9db
NB		 2312 kunmap_atomic(addr, KM_USER0);
2313 }
ec98f782 2314
c66ac9db
NB		 2315out:
2316 kfree(buf);
2317}
2318
2319/*
2320 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2321 */
2322static int transport_get_sense_data(struct se_cmd *cmd)
2323{
2324 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2325 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2326 struct se_task *task = NULL, *task_tmp;
2327 unsigned long flags;
2328 u32 offset = 0;
2329
e3d6f909
AG		 2330 WARN_ON(!cmd->se_lun);
2331
42bf829e
CH		 2332 if (!dev)
2333 return 0;
2334
a1d8b49a 2335 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2336 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2337 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2338 return 0;
2339 }
2340
2341 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2342 &cmd->t_task_list, t_list) {
ef804a84 2343 if (!(task->task_flags & TF_HAS_SENSE))
c66ac9db
NB		 2344 continue;
2345
e3d6f909 2346 if (!dev->transport->get_sense_buffer) {
6708bb27 2347 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2348 " is NULL\n");
2349 continue;
2350 }
2351
e3d6f909 2352 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2353 if (!sense_buffer) {
04629b7b 2354 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2355 " sense buffer for task with sense\n",
04629b7b 2356 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2357 continue;
2358 }
a1d8b49a 2359 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2360
e3d6f909 2361 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2362 TRANSPORT_SENSE_BUFFER);
2363
5951146d 2364 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2365 TRANSPORT_SENSE_BUFFER);
2366 cmd->scsi_status = task->task_scsi_status;
2367 /* Automatically padded */
2368 cmd->scsi_sense_length =
2369 (TRANSPORT_SENSE_BUFFER + offset);
2370
6708bb27 2371 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2372 " and sense\n",
e3d6f909 2373 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2374 cmd->scsi_status);
2375 return 0;
2376 }
a1d8b49a 2377 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2378
2379 return -1;
2380}
2381
ec98f782
AG		 2382static inline long long transport_dev_end_lba(struct se_device *dev)
2383{
2384 return dev->transport->get_blocks(dev) + 1;
2385}
2386
2387static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2388{
2389 struct se_device *dev = cmd->se_dev;
2390 u32 sectors;
2391
2392 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2393 return 0;
2394
2395 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2396
6708bb27
AG		 2397 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2398 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2399 " transport_dev_end_lba(): %llu\n",
2400 cmd->t_task_lba, sectors,
2401 transport_dev_end_lba(dev));
7abbe7f3 2402 return -EINVAL;
ec98f782
AG		 2403 }
2404
7abbe7f3 2405 return 0;
ec98f782
AG		 2406}
2407
706d5860
NB		 2408static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2409{
2410 /*
2411 * Determine if the received WRITE_SAME is used to for direct
2412 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2413 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2414 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2415 */
2416 int passthrough = (dev->transport->transport_type ==
2417 TRANSPORT_PLUGIN_PHBA_PDEV);
2418
2419 if (!passthrough) {
2420 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2421 pr_err("WRITE_SAME PBDATA and LBDATA"
2422 " bits not supported for Block Discard"
2423 " Emulation\n");
2424 return -ENOSYS;
2425 }
2426 /*
2427 * Currently for the emulated case we only accept
2428 * tpws with the UNMAP=1 bit set.
2429 */
2430 if (!(flags[0] & 0x08)) {
2431 pr_err("WRITE_SAME w/o UNMAP bit not"
2432 " supported for Block Discard Emulation\n");
2433 return -ENOSYS;
2434 }
2435 }
2436
2437 return 0;
2438}
2439
c66ac9db
NB		 2440/* transport_generic_cmd_sequencer():
2441 *
2442 * Generic Command Sequencer that should work for most DAS transport
2443 * drivers.
2444 *
2445 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2446 * RX Thread.
2447 *
2448 * FIXME: Need to support other SCSI OPCODES where as well.
2449 */
2450static int transport_generic_cmd_sequencer(
2451 struct se_cmd *cmd,
2452 unsigned char *cdb)
2453{
5951146d 2454 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2455 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2456 int ret = 0, sector_ret = 0, passthrough;
2457 u32 sectors = 0, size = 0, pr_reg_type = 0;
2458 u16 service_action;
2459 u8 alua_ascq = 0;
2460 /*
2461 * Check for an existing UNIT ATTENTION condition
2462 */
2463 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2464 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2465 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2466 return -EINVAL;
c66ac9db
NB		 2467 }
2468 /*
2469 * Check status of Asymmetric Logical Unit Assignment port
2470 */
e3d6f909 2471 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2472 if (ret != 0) {
c66ac9db 2473 /*
25985edc 2474 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2475 * The ALUA additional sense code qualifier (ASCQ) is determined
2476 * by the ALUA primary or secondary access state..
2477 */
2478 if (ret > 0) {
2479#if 0
6708bb27 2480 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2481 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2482 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2483#endif
2484 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2485 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2486 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2487 return -EINVAL;
c66ac9db
NB		 2488 }
2489 goto out_invalid_cdb_field;
2490 }
2491 /*
2492 * Check status for SPC-3 Persistent Reservations
2493 */
e3d6f909
AG		 2494 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2495 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2496 cmd, cdb, pr_reg_type) != 0) {
2497 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2498 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2499 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2500 return -EBUSY;
2501 }
c66ac9db
NB		 2502 /*
2503 * This means the CDB is allowed for the SCSI Initiator port
2504 * when said port is *NOT* holding the legacy SPC-2 or
2505 * SPC-3 Persistent Reservation.
2506 */
2507 }
2508
5bda90c8
CH		 2509 /*
2510 * If we operate in passthrough mode we skip most CDB emulation and
2511 * instead hand the commands down to the physical SCSI device.
2512 */
2513 passthrough =
2514 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2515
c66ac9db
NB		 2516 switch (cdb[0]) {
2517 case READ_6:
2518 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2519 if (sector_ret)
2520 goto out_unsupported_cdb;
2521 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2522 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2523 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2524 break;
2525 case READ_10:
2526 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2527 if (sector_ret)
2528 goto out_unsupported_cdb;
2529 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2530 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2531 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2532 break;
2533 case READ_12:
2534 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2535 if (sector_ret)
2536 goto out_unsupported_cdb;
2537 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2538 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2539 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2540 break;
2541 case READ_16:
2542 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2543 if (sector_ret)
2544 goto out_unsupported_cdb;
2545 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2546 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2547 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2548 break;
2549 case WRITE_6:
2550 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2551 if (sector_ret)
2552 goto out_unsupported_cdb;
2553 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2554 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2555 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2556 break;
2557 case WRITE_10:
2558 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2559 if (sector_ret)
2560 goto out_unsupported_cdb;
2561 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2562 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2563 if (cdb[1] & 0x8)
2564 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2565 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2566 break;
2567 case WRITE_12:
2568 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2569 if (sector_ret)
2570 goto out_unsupported_cdb;
2571 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2572 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2573 if (cdb[1] & 0x8)
2574 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2575 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2576 break;
2577 case WRITE_16:
2578 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2579 if (sector_ret)
2580 goto out_unsupported_cdb;
2581 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2582 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2583 if (cdb[1] & 0x8)
2584 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2585 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2586 break;
2587 case XDWRITEREAD_10:
2588 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2589 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2590 goto out_invalid_cdb_field;
2591 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2592 if (sector_ret)
2593 goto out_unsupported_cdb;
2594 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2595 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2596 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2597
5bda90c8
CH		 2598 /*
2599 * Do now allow BIDI commands for passthrough mode.
2600 */
2601 if (passthrough)
7c1c6af3 2602 goto out_unsupported_cdb;
5bda90c8 2603
c66ac9db 2604 /*
35e0e757 2605 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2606 */
2607 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2608 if (cdb[1] & 0x8)
2609 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2610 break;
2611 case VARIABLE_LENGTH_CMD:
2612 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2613 switch (service_action) {
2614 case XDWRITEREAD_32:
2615 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2616 if (sector_ret)
2617 goto out_unsupported_cdb;
2618 size = transport_get_size(sectors, cdb, cmd);
2619 /*
2620 * Use WRITE_32 and READ_32 opcodes for the emulated
2621 * XDWRITE_READ_32 logic.
2622 */
a1d8b49a 2623 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2624 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2625
5bda90c8
CH		 2626 /*
2627 * Do now allow BIDI commands for passthrough mode.
2628 */
c66ac9db 2629 if (passthrough)
7c1c6af3 2630 goto out_unsupported_cdb;
5bda90c8 2631
c66ac9db 2632 /*
35e0e757
CH		 2633 * Setup BIDI XOR callback to be run during after I/O
2634 * completion.
c66ac9db
NB		 2635 */
2636 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2637 if (cdb[1] & 0x8)
2638 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2639 break;
2640 case WRITE_SAME_32:
2641 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2642 if (sector_ret)
2643 goto out_unsupported_cdb;
dd3a5ad8 2644
6708bb27 2645 if (sectors)
12850626 2646 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2647 else {
2648 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2649 " supported\n");
2650 goto out_invalid_cdb_field;
2651 }
dd3a5ad8 2652
a1d8b49a 2653 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2654 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2655
706d5860 2656 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2657 goto out_invalid_cdb_field;
5bda90c8
CH		 2658 if (!passthrough)
2659 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2660 break;
2661 default:
6708bb27 2662 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2663 " 0x%04x not supported\n", service_action);
2664 goto out_unsupported_cdb;
2665 }
2666 break;
e434f1f1 2667 case MAINTENANCE_IN:
e3d6f909 2668 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2669 /* MAINTENANCE_IN from SCC-2 */
2670 /*
2671 * Check for emulated MI_REPORT_TARGET_PGS.
2672 */
e76a35d6
CH		 2673 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2674 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2675 cmd->execute_task =
2676 target_emulate_report_target_port_groups;
c66ac9db
NB		 2677 }
2678 size = (cdb[6] << 24) | (cdb[7] << 16) |
2679 (cdb[8] << 8) | cdb[9];
2680 } else {
2681 /* GPCMD_SEND_KEY from multi media commands */
2682 size = (cdb[8] << 8) + cdb[9];
2683 }
05d1c7c0 2684 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2685 break;
2686 case MODE_SELECT:
2687 size = cdb[4];
2688 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2689 break;
2690 case MODE_SELECT_10:
2691 size = (cdb[7] << 8) + cdb[8];
2692 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2693 break;
2694 case MODE_SENSE:
2695 size = cdb[4];
05d1c7c0 2696 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2697 if (!passthrough)
2698 cmd->execute_task = target_emulate_modesense;
c66ac9db
NB		 2699 break;
2700 case MODE_SENSE_10:
5bda90c8
CH		 2701 size = (cdb[7] << 8) + cdb[8];
2702 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2703 if (!passthrough)
2704 cmd->execute_task = target_emulate_modesense;
2705 break;
c66ac9db
NB		 2706 case GPCMD_READ_BUFFER_CAPACITY:
2707 case GPCMD_SEND_OPC:
2708 case LOG_SELECT:
2709 case LOG_SENSE:
2710 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2711 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2712 break;
2713 case READ_BLOCK_LIMITS:
2714 size = READ_BLOCK_LEN;
05d1c7c0 2715 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2716 break;
2717 case GPCMD_GET_CONFIGURATION:
2718 case GPCMD_READ_FORMAT_CAPACITIES:
2719 case GPCMD_READ_DISC_INFO:
2720 case GPCMD_READ_TRACK_RZONE_INFO:
2721 size = (cdb[7] << 8) + cdb[8];
2722 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2723 break;
2724 case PERSISTENT_RESERVE_IN:
617c0e06 2725 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2726 cmd->execute_task = target_scsi3_emulate_pr_in;
617c0e06
CH		 2727 size = (cdb[7] << 8) + cdb[8];
2728 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2729 break;
c66ac9db 2730 case PERSISTENT_RESERVE_OUT:
617c0e06 2731 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2732 cmd->execute_task = target_scsi3_emulate_pr_out;
c66ac9db 2733 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2734 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2735 break;
2736 case GPCMD_MECHANISM_STATUS:
2737 case GPCMD_READ_DVD_STRUCTURE:
2738 size = (cdb[8] << 8) + cdb[9];
2739 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2740 break;
2741 case READ_POSITION:
2742 size = READ_POSITION_LEN;
05d1c7c0 2743 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2744 break;
e434f1f1 2745 case MAINTENANCE_OUT:
e3d6f909 2746 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2747 /* MAINTENANCE_OUT from SCC-2
2748 *
2749 * Check for emulated MO_SET_TARGET_PGS.
2750 */
e76a35d6
CH		 2751 if (cdb[1] == MO_SET_TARGET_PGS &&
2752 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2753 cmd->execute_task =
2754 target_emulate_set_target_port_groups;
c66ac9db
NB		 2755 }
2756
2757 size = (cdb[6] << 24) | (cdb[7] << 16) |
2758 (cdb[8] << 8) | cdb[9];
2759 } else {
2760 /* GPCMD_REPORT_KEY from multi media commands */
2761 size = (cdb[8] << 8) + cdb[9];
2762 }
05d1c7c0 2763 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2764 break;
2765 case INQUIRY:
2766 size = (cdb[3] << 8) + cdb[4];
2767 /*
2768 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2769 * See spc4r17 section 5.3
2770 */
5951146d 2771 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2772 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2773 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2774 if (!passthrough)
2775 cmd->execute_task = target_emulate_inquiry;
c66ac9db
NB		 2776 break;
2777 case READ_BUFFER:
2778 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2779 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2780 break;
2781 case READ_CAPACITY:
2782 size = READ_CAP_LEN;
05d1c7c0 2783 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2784 if (!passthrough)
2785 cmd->execute_task = target_emulate_readcapacity;
c66ac9db
NB		 2786 break;
2787 case READ_MEDIA_SERIAL_NUMBER:
2788 case SECURITY_PROTOCOL_IN:
2789 case SECURITY_PROTOCOL_OUT:
2790 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2791 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2792 break;
2793 case SERVICE_ACTION_IN:
5bda90c8
CH		 2794 switch (cmd->t_task_cdb[1] & 0x1f) {
2795 case SAI_READ_CAPACITY_16:
2796 if (!passthrough)
2797 cmd->execute_task =
2798 target_emulate_readcapacity_16;
2799 break;
2800 default:
2801 if (passthrough)
2802 break;
2803
2804 pr_err("Unsupported SA: 0x%02x\n",
2805 cmd->t_task_cdb[1] & 0x1f);
2806 goto out_unsupported_cdb;
2807 }
2808 /*FALLTHROUGH*/
c66ac9db
NB		 2809 case ACCESS_CONTROL_IN:
2810 case ACCESS_CONTROL_OUT:
2811 case EXTENDED_COPY:
2812 case READ_ATTRIBUTE:
2813 case RECEIVE_COPY_RESULTS:
2814 case WRITE_ATTRIBUTE:
2815 size = (cdb[10] << 24) | (cdb[11] << 16) |
2816 (cdb[12] << 8) | cdb[13];
05d1c7c0 2817 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2818 break;
2819 case RECEIVE_DIAGNOSTIC:
2820 case SEND_DIAGNOSTIC:
2821 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2822 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2823 break;
2824/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2825#if 0
2826 case GPCMD_READ_CD:
2827 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2828 size = (2336 * sectors);
05d1c7c0 2829 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2830 break;
2831#endif
2832 case READ_TOC:
2833 size = cdb[8];
05d1c7c0 2834 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2835 break;
2836 case REQUEST_SENSE:
2837 size = cdb[4];
05d1c7c0 2838 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2839 if (!passthrough)
2840 cmd->execute_task = target_emulate_request_sense;
c66ac9db
NB		 2841 break;
2842 case READ_ELEMENT_STATUS:
2843 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2844 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2845 break;
2846 case WRITE_BUFFER:
2847 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2848 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2849 break;
2850 case RESERVE:
2851 case RESERVE_10:
2852 /*
2853 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2854 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2855 */
2856 if (cdb[0] == RESERVE_10)
2857 size = (cdb[7] << 8) | cdb[8];
2858 else
2859 size = cmd->data_length;
2860
2861 /*
2862 * Setup the legacy emulated handler for SPC-2 and
2863 * >= SPC-3 compatible reservation handling (CRH=1)
2864 * Otherwise, we assume the underlying SCSI logic is
2865 * is running in SPC_PASSTHROUGH, and wants reservations
2866 * emulation disabled.
2867 */
e76a35d6
CH		 2868 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2869 cmd->execute_task = target_scsi2_reservation_reserve;
c66ac9db
NB		 2870 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2871 break;
2872 case RELEASE:
2873 case RELEASE_10:
2874 /*
2875 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2876 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2877 */
2878 if (cdb[0] == RELEASE_10)
2879 size = (cdb[7] << 8) | cdb[8];
2880 else
2881 size = cmd->data_length;
2882
e76a35d6
CH		 2883 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2884 cmd->execute_task = target_scsi2_reservation_release;
c66ac9db
NB		 2885 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2886 break;
2887 case SYNCHRONIZE_CACHE:
2888 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2889 /*
2890 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2891 */
2892 if (cdb[0] == SYNCHRONIZE_CACHE) {
2893 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2894 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2895 } else {
2896 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2897 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2898 }
2899 if (sector_ret)
2900 goto out_unsupported_cdb;
2901
2902 size = transport_get_size(sectors, cdb, cmd);
2903 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2904
5bda90c8 2905 if (passthrough)
c66ac9db 2906 break;
5bda90c8 2907
c66ac9db
NB		 2908 /*
2909 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 2910 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 2911 */
7abbe7f3
NB		 2912 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2913 if (transport_cmd_get_valid_sectors(cmd) < 0)
2914 goto out_invalid_cdb_field;
2915 }
5bda90c8 2916 cmd->execute_task = target_emulate_synchronize_cache;
c66ac9db
NB		 2917 break;
2918 case UNMAP:
2919 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 2920 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2921 if (!passthrough)
2922 cmd->execute_task = target_emulate_unmap;
c66ac9db
NB		 2923 break;
2924 case WRITE_SAME_16:
2925 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2926 if (sector_ret)
2927 goto out_unsupported_cdb;
dd3a5ad8 2928
6708bb27 2929 if (sectors)
12850626 2930 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2931 else {
2932 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2933 goto out_invalid_cdb_field;
2934 }
dd3a5ad8 2935
5db0753b 2936 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 2937 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2938
2939 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2940 goto out_invalid_cdb_field;
5bda90c8
CH		 2941 if (!passthrough)
2942 cmd->execute_task = target_emulate_write_same;
706d5860
NB		 2943 break;
2944 case WRITE_SAME:
2945 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2946 if (sector_ret)
2947 goto out_unsupported_cdb;
2948
2949 if (sectors)
12850626 2950 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 2951 else {
2952 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2953 goto out_invalid_cdb_field;
c66ac9db 2954 }
706d5860
NB		 2955
2956 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 2957 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 2958 /*
2959 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2960 * of byte 1 bit 3 UNMAP instead of original reserved field
2961 */
2962 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2963 goto out_invalid_cdb_field;
5bda90c8
CH		 2964 if (!passthrough)
2965 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2966 break;
2967 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 2968 case ERASE:
c66ac9db
NB		 2969 case REZERO_UNIT:
2970 case SEEK_10:
c66ac9db
NB		 2971 case SPACE:
2972 case START_STOP:
2973 case TEST_UNIT_READY:
2974 case VERIFY:
2975 case WRITE_FILEMARKS:
5bda90c8
CH		 2976 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2977 if (!passthrough)
2978 cmd->execute_task = target_emulate_noop;
2979 break;
2980 case GPCMD_CLOSE_TRACK:
2981 case INITIALIZE_ELEMENT_STATUS:
2982 case GPCMD_LOAD_UNLOAD:
2983 case GPCMD_SET_SPEED:
c66ac9db
NB		 2984 case MOVE_MEDIUM:
2985 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2986 break;
2987 case REPORT_LUNS:
e76a35d6 2988 cmd->execute_task = target_report_luns;
c66ac9db
NB		 2989 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2990 /*
2991 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2992 * See spc4r17 section 5.3
2993 */
5951146d 2994 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2995 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2996 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2997 break;
2998 default:
6708bb27 2999 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3000 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3001 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3002 goto out_unsupported_cdb;
3003 }
3004
3005 if (size != cmd->data_length) {
6708bb27 3006 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3007 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3008 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3009 cmd->data_length, size, cdb[0]);
3010
3011 cmd->cmd_spdtl = size;
3012
3013 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3014 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3015 " WRITE data\n");
3016 goto out_invalid_cdb_field;
3017 }
3018 /*
3019 * Reject READ_* or WRITE_* with overflow/underflow for
3020 * type SCF_SCSI_DATA_SG_IO_CDB.
3021 */
6708bb27
AG		 3022 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3023 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3024 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3025 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3026 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3027 goto out_invalid_cdb_field;
3028 }
3029
3030 if (size > cmd->data_length) {
3031 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3032 cmd->residual_count = (size - cmd->data_length);
3033 } else {
3034 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3035 cmd->residual_count = (cmd->data_length - size);
3036 }
3037 cmd->data_length = size;
3038 }
3039
5bda90c8
CH		 3040 /* reject any command that we don't have a handler for */
3041 if (!(passthrough || cmd->execute_task ||
3042 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3043 goto out_unsupported_cdb;
3044
d0229ae3
AG		 3045 /* Let's limit control cdbs to a page, for simplicity's sake. */
3046 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3047 size > PAGE_SIZE)
3048 goto out_invalid_cdb_field;
3049
c66ac9db
NB		 3050 transport_set_supported_SAM_opcode(cmd);
3051 return ret;
3052
3053out_unsupported_cdb:
3054 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3055 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3056 return -EINVAL;
c66ac9db
NB		 3057out_invalid_cdb_field:
3058 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3059 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3060 return -EINVAL;
c66ac9db
NB		 3061}
3062
c66ac9db 3063/*
35e0e757 3064 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3065 * and ordered cmds need to have their tasks added to the execution queue.
3066 */
3067static void transport_complete_task_attr(struct se_cmd *cmd)
3068{
5951146d 3069 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3070 struct se_cmd *cmd_p, *cmd_tmp;
3071 int new_active_tasks = 0;
3072
e66ecd50 3073 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3074 atomic_dec(&dev->simple_cmds);
3075 smp_mb__after_atomic_dec();
3076 dev->dev_cur_ordered_id++;
6708bb27 3077 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3078 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3079 cmd->se_ordered_id);
e66ecd50 3080 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3081 dev->dev_cur_ordered_id++;
6708bb27 3082 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3083 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3084 cmd->se_ordered_id);
e66ecd50 3085 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3086 atomic_dec(&dev->dev_ordered_sync);
3087 smp_mb__after_atomic_dec();
c66ac9db
NB		 3088
3089 dev->dev_cur_ordered_id++;
6708bb27 3090 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3091 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3092 }
3093 /*
3094 * Process all commands up to the last received
3095 * ORDERED task attribute which requires another blocking
3096 * boundary
3097 */
3098 spin_lock(&dev->delayed_cmd_lock);
3099 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3100 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3101
5951146d 3102 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3103 spin_unlock(&dev->delayed_cmd_lock);
3104
6708bb27 3105 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3106 " cmd_p: 0x%02x Task Attr: 0x%02x"
3107 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3108 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3109 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3110
3111 transport_add_tasks_from_cmd(cmd_p);
3112 new_active_tasks++;
3113
3114 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3115 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3116 break;
3117 }
3118 spin_unlock(&dev->delayed_cmd_lock);
3119 /*
3120 * If new tasks have become active, wake up the transport thread
3121 * to do the processing of the Active tasks.
3122 */
3123 if (new_active_tasks != 0)
e3d6f909 3124 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3125}
3126
e057f533 3127static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3128{
3129 int ret = 0;
3130
e057f533
CH		 3131 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3132 transport_complete_task_attr(cmd);
3133
3134 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3135 ret = cmd->se_tfo->queue_status(cmd);
3136 if (ret)
3137 goto out;
3138 }
07bde79a
NB		 3139
3140 switch (cmd->data_direction) {
3141 case DMA_FROM_DEVICE:
3142 ret = cmd->se_tfo->queue_data_in(cmd);
3143 break;
3144 case DMA_TO_DEVICE:
ec98f782 3145 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3146 ret = cmd->se_tfo->queue_data_in(cmd);
3147 if (ret < 0)
e057f533 3148 break;
07bde79a
NB		 3149 }
3150 /* Fall through for DMA_TO_DEVICE */
3151 case DMA_NONE:
3152 ret = cmd->se_tfo->queue_status(cmd);
3153 break;
3154 default:
3155 break;
3156 }
3157
e057f533
CH		 3158out:
3159 if (ret < 0) {
3160 transport_handle_queue_full(cmd, cmd->se_dev);
3161 return;
3162 }
3163 transport_lun_remove_cmd(cmd);
3164 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3165}
3166
3167static void transport_handle_queue_full(
3168 struct se_cmd *cmd,
e057f533 3169 struct se_device *dev)
07bde79a
NB		 3170{
3171 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3172 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3173 atomic_inc(&dev->dev_qf_count);
3174 smp_mb__after_atomic_inc();
3175 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3176
3177 schedule_work(&cmd->se_dev->qf_work_queue);
3178}
3179
35e0e757 3180static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3181{
35e0e757 3182 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3183 int reason = 0, ret;
35e0e757 3184
c66ac9db
NB		 3185 /*
3186 * Check if we need to move delayed/dormant tasks from cmds on the
3187 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3188 * Attribute.
3189 */
5951146d 3190 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3191 transport_complete_task_attr(cmd);
07bde79a
NB		 3192 /*
3193 * Check to schedule QUEUE_FULL work, or execute an existing
3194 * cmd->transport_qf_callback()
3195 */
3196 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3197 schedule_work(&cmd->se_dev->qf_work_queue);
3198
c66ac9db
NB		 3199 /*
3200 * Check if we need to retrieve a sense buffer from
3201 * the struct se_cmd in question.
3202 */
3203 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3204 if (transport_get_sense_data(cmd) < 0)
3205 reason = TCM_NON_EXISTENT_LUN;
3206
3207 /*
3208 * Only set when an struct se_task->task_scsi_status returned
3209 * a non GOOD status.
3210 */
3211 if (cmd->scsi_status) {
07bde79a 3212 ret = transport_send_check_condition_and_sense(
c66ac9db 3213 cmd, reason, 1);
f147abb4 3214 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3215 goto queue_full;
3216
c66ac9db
NB		 3217 transport_lun_remove_cmd(cmd);
3218 transport_cmd_check_stop_to_fabric(cmd);
3219 return;
3220 }
3221 }
3222 /*
25985edc 3223 * Check for a callback, used by amongst other things
c66ac9db
NB		 3224 * XDWRITE_READ_10 emulation.
3225 */
3226 if (cmd->transport_complete_callback)
3227 cmd->transport_complete_callback(cmd);
3228
3229 switch (cmd->data_direction) {
3230 case DMA_FROM_DEVICE:
3231 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3232 if (cmd->se_lun->lun_sep) {
3233 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3234 cmd->data_length;
3235 }
3236 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3237
07bde79a 3238 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3239 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3240 goto queue_full;
c66ac9db
NB		 3241 break;
3242 case DMA_TO_DEVICE:
3243 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3244 if (cmd->se_lun->lun_sep) {
3245 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3246 cmd->data_length;
3247 }
3248 spin_unlock(&cmd->se_lun->lun_sep_lock);
3249 /*
3250 * Check if we need to send READ payload for BIDI-COMMAND
3251 */
ec98f782 3252 if (cmd->t_bidi_data_sg) {
c66ac9db 3253 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3254 if (cmd->se_lun->lun_sep) {
3255 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3256 cmd->data_length;
3257 }
3258 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3259 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3260 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3261 goto queue_full;
c66ac9db
NB		 3262 break;
3263 }
3264 /* Fall through for DMA_TO_DEVICE */
3265 case DMA_NONE:
07bde79a 3266 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3267 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3268 goto queue_full;
c66ac9db
NB		 3269 break;
3270 default:
3271 break;
3272 }
3273
3274 transport_lun_remove_cmd(cmd);
3275 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3276 return;
3277
3278queue_full:
6708bb27 3279 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3280 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3281 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3282 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3283}
3284
3285static void transport_free_dev_tasks(struct se_cmd *cmd)
3286{
3287 struct se_task *task, *task_tmp;
3288 unsigned long flags;
0c2cfe5f 3289 LIST_HEAD(dispose_list);
c66ac9db 3290
a1d8b49a 3291 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3292 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3293 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3294 if (!(task->task_flags & TF_ACTIVE))
3295 list_move_tail(&task->t_list, &dispose_list);
3296 }
3297 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3298
3299 while (!list_empty(&dispose_list)) {
3300 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3301
af3f00c7
CH		 3302 if (task->task_sg != cmd->t_data_sg &&
3303 task->task_sg != cmd->t_bidi_data_sg)
3304 kfree(task->task_sg);
c66ac9db
NB		 3305
3306 list_del(&task->t_list);
3307
42bf829e 3308 cmd->se_dev->transport->free_task(task);
c66ac9db 3309 }
c66ac9db
NB		 3310}
3311
6708bb27 3312static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3313{
ec98f782 3314 struct scatterlist *sg;
ec98f782 3315 int count;
c66ac9db 3316
6708bb27
AG		 3317 for_each_sg(sgl, sg, nents, count)
3318 __free_page(sg_page(sg));
c66ac9db 3319
6708bb27
AG		 3320 kfree(sgl);
3321}
c66ac9db 3322
6708bb27
AG		 3323static inline void transport_free_pages(struct se_cmd *cmd)
3324{
3325 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3326 return;
3327
3328 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3329 cmd->t_data_sg = NULL;
3330 cmd->t_data_nents = 0;
c66ac9db 3331
6708bb27 3332 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3333 cmd->t_bidi_data_sg = NULL;
3334 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3335}
3336
e26d99ae
CH		 3337/**
3338 * transport_release_cmd - free a command
3339 * @cmd: command to free
3340 *
3341 * This routine unconditionally frees a command, and reference counting
3342 * or list removal must be done in the caller.
3343 */
3344static void transport_release_cmd(struct se_cmd *cmd)
3345{
3346 BUG_ON(!cmd->se_tfo);
3347
3348 if (cmd->se_tmr_req)
3349 core_tmr_release_req(cmd->se_tmr_req);
3350 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3351 kfree(cmd->t_task_cdb);
3352 /*
3353 * Check if target_wait_for_sess_cmds() is expecting to
3354 * release se_cmd directly here..
3355 */
3356 if (cmd->check_release != 0 && cmd->se_tfo->check_release_cmd)
3357 if (cmd->se_tfo->check_release_cmd(cmd) != 0)
3358 return;
3359
3360 cmd->se_tfo->release_cmd(cmd);
3361}
3362
d3df7825
CH		 3363/**
3364 * transport_put_cmd - release a reference to a command
3365 * @cmd: command to release
3366 *
3367 * This routine releases our reference to the command and frees it if possible.
3368 */
39c05f32 3369static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3370{
3371 unsigned long flags;
4911e3cc 3372 int free_tasks = 0;
c66ac9db 3373
a1d8b49a 3374 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3375 if (atomic_read(&cmd->t_fe_count)) {
3376 if (!atomic_dec_and_test(&cmd->t_fe_count))
3377 goto out_busy;
3378 }
3379
3380 if (atomic_read(&cmd->t_se_count)) {
3381 if (!atomic_dec_and_test(&cmd->t_se_count))
3382 goto out_busy;
3383 }
3384
3385 if (atomic_read(&cmd->transport_dev_active)) {
3386 atomic_set(&cmd->transport_dev_active, 0);
3387 transport_all_task_dev_remove_state(cmd);
3388 free_tasks = 1;
c66ac9db 3389 }
a1d8b49a 3390 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3391
4911e3cc
CH		 3392 if (free_tasks != 0)
3393 transport_free_dev_tasks(cmd);
d3df7825 3394
c66ac9db 3395 transport_free_pages(cmd);
31afc39c 3396 transport_release_cmd(cmd);
39c05f32 3397 return;
4911e3cc
CH		 3398out_busy:
3399 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3400}
3401
c66ac9db 3402/*
ec98f782
AG		 3403 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3404 * allocating in the core.
c66ac9db
NB		 3405 * @cmd: Associated se_cmd descriptor
3406 * @mem: SGL style memory for TCM WRITE / READ
3407 * @sg_mem_num: Number of SGL elements
3408 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3409 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3410 *
3411 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3412 * of parameters.
3413 */
3414int transport_generic_map_mem_to_cmd(
3415 struct se_cmd *cmd,
5951146d
AG		 3416 struct scatterlist *sgl,
3417 u32 sgl_count,
3418 struct scatterlist *sgl_bidi,
3419 u32 sgl_bidi_count)
c66ac9db 3420{
5951146d 3421 if (!sgl || !sgl_count)
c66ac9db 3422 return 0;
c66ac9db 3423
c66ac9db
NB		 3424 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3425 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
fef58a60
NB		 3426 /*
3427 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3428 * scatterlists already have been set to follow what the fabric
3429 * passes for the original expected data transfer length.
3430 */
3431 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3432 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3433 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3434 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3435 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3436 return -EINVAL;
3437 }
c66ac9db 3438
ec98f782
AG		 3439 cmd->t_data_sg = sgl;
3440 cmd->t_data_nents = sgl_count;
c66ac9db 3441
ec98f782
AG		 3442 if (sgl_bidi && sgl_bidi_count) {
3443 cmd->t_bidi_data_sg = sgl_bidi;
3444 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3445 }
3446 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3447 }
3448
3449 return 0;
3450}
3451EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3452
05d1c7c0
AG		 3453void *transport_kmap_first_data_page(struct se_cmd *cmd)
3454{
ec98f782 3455 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3456
ec98f782 3457 BUG_ON(!sg);
05d1c7c0 3458 /*
ec98f782
AG		 3459 * We need to take into account a possible offset here for fabrics like
3460 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3461 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3462 */
ec98f782 3463 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3464}
3465EXPORT_SYMBOL(transport_kmap_first_data_page);
3466
3467void transport_kunmap_first_data_page(struct se_cmd *cmd)
3468{
ec98f782 3469 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3470}
3471EXPORT_SYMBOL(transport_kunmap_first_data_page);
3472
c66ac9db 3473static int
05d1c7c0 3474transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3475{
ec98f782
AG		 3476 u32 length = cmd->data_length;
3477 unsigned int nents;
3478 struct page *page;
3479 int i = 0;
c66ac9db 3480
ec98f782
AG		 3481 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3482 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3483 if (!cmd->t_data_sg)
3484 return -ENOMEM;
c66ac9db 3485
ec98f782
AG		 3486 cmd->t_data_nents = nents;
3487 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3488
ec98f782
AG		 3489 while (length) {
3490 u32 page_len = min_t(u32, length, PAGE_SIZE);
3491 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3492 if (!page)
3493 goto out;
c66ac9db 3494
ec98f782
AG		 3495 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3496 length -= page_len;
3497 i++;
c66ac9db 3498 }
c66ac9db 3499 return 0;
c66ac9db 3500
ec98f782
AG		 3501out:
3502 while (i >= 0) {
3503 __free_page(sg_page(&cmd->t_data_sg[i]));
3504 i--;
c66ac9db 3505 }
ec98f782
AG		 3506 kfree(cmd->t_data_sg);
3507 cmd->t_data_sg = NULL;
3508 return -ENOMEM;
c66ac9db
NB		 3509}
3510
a1d8b49a
AG		 3511/* Reduce sectors if they are too long for the device */
3512static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3513 struct se_device *dev,
3514 unsigned long long lba,
a1d8b49a 3515 sector_t sectors)
c66ac9db 3516{
a1d8b49a 3517 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3518
a1d8b49a
AG		 3519 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3520 if ((lba + sectors) > transport_dev_end_lba(dev))
3521 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3522
a1d8b49a 3523 return sectors;
c66ac9db
NB		 3524}
3525
c66ac9db
NB		 3526
3527/*
3528 * This function can be used by HW target mode drivers to create a linked
3529 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3530 * This is intended to be called during the completion path by TCM Core
3531 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3532 */
3533void transport_do_task_sg_chain(struct se_cmd *cmd)
3534{
ec98f782
AG		 3535 struct scatterlist *sg_first = NULL;
3536 struct scatterlist *sg_prev = NULL;
3537 int sg_prev_nents = 0;
3538 struct scatterlist *sg;
c66ac9db 3539 struct se_task *task;
ec98f782 3540 u32 chained_nents = 0;
c66ac9db
NB		 3541 int i;
3542
ec98f782
AG		 3543 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3544
c66ac9db
NB		 3545 /*
3546 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3547 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3548 */
a1d8b49a 3549 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3550 if (!task->task_sg)
c66ac9db
NB		 3551 continue;
3552
ec98f782
AG		 3553 if (!sg_first) {
3554 sg_first = task->task_sg;
6708bb27 3555 chained_nents = task->task_sg_nents;
97868c89 3556 } else {
ec98f782 3557 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3558 chained_nents += task->task_sg_nents;
97868c89 3559 }
c3c74c7a
NB		 3560 /*
3561 * For the padded tasks, use the extra SGL vector allocated
3562 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3563 * offset into sg_chain() above.
3564 *
3565 * We do not need the padding for the last task (or a single
3566 * task), but in that case we will never use the sg_prev_nents
3567 * value below which would be incorrect.
c3c74c7a 3568 */
04629b7b 3569 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3570 sg_prev = task->task_sg;
c66ac9db
NB		 3571 }
3572 /*
3573 * Setup the starting pointer and total t_tasks_sg_linked_no including
3574 * padding SGs for linking and to mark the end.
3575 */
a1d8b49a 3576 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3577 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3578
6708bb27 3579 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3580 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3581 cmd->t_tasks_sg_chained_no);
c66ac9db 3582
a1d8b49a
AG		 3583 for_each_sg(cmd->t_tasks_sg_chained, sg,
3584 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3585
6708bb27 3586 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3587 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3588 if (sg_is_chain(sg))
6708bb27 3589 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3590 if (sg_is_last(sg))
6708bb27 3591 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3592 }
c66ac9db
NB		 3593}
3594EXPORT_SYMBOL(transport_do_task_sg_chain);
3595
a1d8b49a
AG		 3596/*
3597 * Break up cmd into chunks transport can handle
3598 */
38b40067
CH		 3599static int
3600transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3601 enum dma_data_direction data_direction,
38b40067 3602 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3603{
5951146d 3604 struct se_device *dev = cmd->se_dev;
a3eedc22 3605 int task_count, i;
38b40067
CH		 3606 unsigned long long lba;
3607 sector_t sectors, dev_max_sectors;
3608 u32 sector_size;
3609
3610 if (transport_cmd_get_valid_sectors(cmd) < 0)
3611 return -EINVAL;
3612
3613 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3614 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
a1d8b49a 3615
ec98f782 3616 WARN_ON(cmd->data_length % sector_size);
38b40067
CH		 3617
3618 lba = cmd->t_task_lba;
ec98f782 3619 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27 3620 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
af3f00c7
CH		 3621
3622 /*
3623 * If we need just a single task reuse the SG list in the command
3624 * and avoid a lot of work.
3625 */
3626 if (task_count == 1) {
3627 struct se_task *task;
3628 unsigned long flags;
3629
3630 task = transport_generic_get_task(cmd, data_direction);
3631 if (!task)
3632 return -ENOMEM;
3633
3634 task->task_sg = cmd_sg;
3635 task->task_sg_nents = sgl_nents;
3636
3637 task->task_lba = lba;
3638 task->task_sectors = sectors;
3639 task->task_size = task->task_sectors * sector_size;
3640
3641 spin_lock_irqsave(&cmd->t_state_lock, flags);
3642 list_add_tail(&task->t_list, &cmd->t_task_list);
3643 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3644
3645 return task_count;
3646 }
3647
ec98f782 3648 for (i = 0; i < task_count; i++) {
38b40067 3649 struct se_task *task;
c3c74c7a 3650 unsigned int task_size, task_sg_nents_padded;
38b40067
CH		 3651 struct scatterlist *sg;
3652 unsigned long flags;
ec98f782 3653 int count;
a1d8b49a 3654
c66ac9db 3655 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3656 if (!task)
ec98f782 3657 return -ENOMEM;
c66ac9db 3658
c66ac9db 3659 task->task_lba = lba;
ec98f782
AG		 3660 task->task_sectors = min(sectors, dev_max_sectors);
3661 task->task_size = task->task_sectors * sector_size;
c66ac9db 3662
525a48a2
NB		 3663 /*
3664 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3665 * in order to calculate the number per task SGL entries
3666 */
3667 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3668 /*
ec98f782
AG		 3669 * Check if the fabric module driver is requesting that all
3670 * struct se_task->task_sg[] be chained together.. If so,
3671 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3672 * marking the end of the chained SGL for every task except
3673 * the last one for (task_count > 1) operation, or skipping
3674 * the extra padding for the (task_count == 1) case.
c66ac9db 3675 */
c3c74c7a
NB		 3676 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3677 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3678 } else
3679 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3680
1d20bb61 3681 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3682 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3683 if (!task->task_sg) {
3684 cmd->se_dev->transport->free_task(task);
3685 return -ENOMEM;
3686 }
3687
c3c74c7a 3688 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3689
ec98f782
AG		 3690 task_size = task->task_size;
3691
3692 /* Build new sgl, only up to task_size */
6708bb27 3693 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3694 if (cmd_sg->length > task_size)
3695 break;
3696
3697 *sg = *cmd_sg;
3698 task_size -= cmd_sg->length;
3699 cmd_sg = sg_next(cmd_sg);
c66ac9db 3700 }
c66ac9db 3701
ec98f782
AG		 3702 lba += task->task_sectors;
3703 sectors -= task->task_sectors;
c66ac9db 3704
ec98f782
AG		 3705 spin_lock_irqsave(&cmd->t_state_lock, flags);
3706 list_add_tail(&task->t_list, &cmd->t_task_list);
3707 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3708 }
3709
ec98f782 3710 return task_count;
c66ac9db
NB		 3711}
3712
3713static int
ec98f782 3714transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3715{
c66ac9db 3716 struct se_task *task;
ec98f782 3717 unsigned long flags;
c66ac9db
NB		 3718
3719 task = transport_generic_get_task(cmd, cmd->data_direction);
3720 if (!task)
ec98f782 3721 return -ENOMEM;
c66ac9db 3722
af3f00c7 3723 task->task_sg = cmd->t_data_sg;
c66ac9db 3724 task->task_size = cmd->data_length;
6708bb27 3725 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3726
ec98f782
AG		 3727 spin_lock_irqsave(&cmd->t_state_lock, flags);
3728 list_add_tail(&task->t_list, &cmd->t_task_list);
3729 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3730
6708bb27 3731 /* Success! Return number of tasks allocated */
a3eedc22 3732 return 1;
ec98f782
AG		 3733}
3734
da0f7619
CH		 3735/*
3736 * Allocate any required ressources to execute the command, and either place
3737 * it on the execution queue if possible. For writes we might not have the
3738 * payload yet, thus notify the fabric via a call to ->write_pending instead.
c66ac9db 3739 */
a1d8b49a 3740int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3741{
da0f7619 3742 struct se_device *dev = cmd->se_dev;
9ac54987 3743 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3744 int set_counts = 1;
c66ac9db
NB		 3745 int ret = 0;
3746
3747 /*
3748 * Determine is the TCM fabric module has already allocated physical
3749 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3750 * beforehand.
c66ac9db 3751 */
ec98f782
AG		 3752 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3753 cmd->data_length) {
05d1c7c0 3754 ret = transport_generic_get_mem(cmd);
c66ac9db 3755 if (ret < 0)
03e98c9e 3756 goto out_fail;
c66ac9db 3757 }
da0f7619 3758
1d20bb61 3759 /*
38b40067 3760 * For BIDI command set up the read tasks first.
1d20bb61 3761 */
da0f7619 3762 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3763 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3764 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3765
9ac54987
NB		 3766 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3767 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3768 cmd->t_bidi_data_nents);
3769 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3770 goto out_fail;
3771
3772 atomic_inc(&cmd->t_fe_count);
3773 atomic_inc(&cmd->t_se_count);
3774 set_counts = 0;
3775 }
38b40067
CH		 3776
3777 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3778 task_cdbs = transport_allocate_data_tasks(cmd,
3779 cmd->data_direction, cmd->t_data_sg,
3780 cmd->t_data_nents);
3781 } else {
3782 task_cdbs = transport_allocate_control_task(cmd);
3783 }
3784
410f6702 3785 if (task_cdbs < 0)
da0f7619 3786 goto out_fail;
410f6702
RD		 3787 else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3788 cmd->t_state = TRANSPORT_COMPLETE;
3789 atomic_set(&cmd->t_transport_active, 1);
3790 INIT_WORK(&cmd->work, target_complete_ok_work);
3791 queue_work(target_completion_wq, &cmd->work);
3792 return 0;
3793 }
da0f7619
CH		 3794
3795 if (set_counts) {
3796 atomic_inc(&cmd->t_fe_count);
3797 atomic_inc(&cmd->t_se_count);
3798 }
3799
9ac54987
NB		 3800 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3801 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3802 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3803
c66ac9db 3804 /*
a1d8b49a 3805 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3806 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3807 * will be added to the struct se_device execution queue after its WRITE
3808 * data has arrived. (ie: It gets handled by the transport processing
3809 * thread a second time)
3810 */
3811 if (cmd->data_direction == DMA_TO_DEVICE) {
3812 transport_add_tasks_to_state_queue(cmd);
3813 return transport_generic_write_pending(cmd);
3814 }
3815 /*
3816 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3817 * to the execution queue.
3818 */
3819 transport_execute_tasks(cmd);
3820 return 0;
da0f7619
CH		 3821
3822out_fail:
3823 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3824 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3825 return -EINVAL;
c66ac9db 3826}
a1d8b49a 3827EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3828
3829/* transport_generic_process_write():
3830 *
3831 *
3832 */
3833void transport_generic_process_write(struct se_cmd *cmd)
3834{
c66ac9db
NB		 3835 transport_execute_tasks(cmd);
3836}
3837EXPORT_SYMBOL(transport_generic_process_write);
3838
e057f533 3839static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3840{
f147abb4
NB		 3841 int ret;
3842
3843 ret = cmd->se_tfo->write_pending(cmd);
3844 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3845 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3846 cmd);
3847 transport_handle_queue_full(cmd, cmd->se_dev);
3848 }
07bde79a
NB		 3849}
3850
c66ac9db
NB		 3851static int transport_generic_write_pending(struct se_cmd *cmd)
3852{
3853 unsigned long flags;
3854 int ret;
3855
a1d8b49a 3856 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3857 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3858 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3859
c66ac9db
NB		 3860 /*
3861 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 3862 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 3863 * can be called from HW target mode interrupt code. This is safe
e3d6f909 3864 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3865 * because the se_cmd->se_lun pointer is not being cleared.
3866 */
3867 transport_cmd_check_stop(cmd, 1, 0);
3868
3869 /*
3870 * Call the fabric write_pending function here to let the
3871 * frontend know that WRITE buffers are ready.
3872 */
e3d6f909 3873 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3874 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3875 goto queue_full;
3876 else if (ret < 0)
c66ac9db
NB		 3877 return ret;
3878
03e98c9e 3879 return 1;
07bde79a
NB		 3880
3881queue_full:
6708bb27 3882 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3883 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3884 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3885 return 0;
c66ac9db
NB		 3886}
3887
39c05f32 3888void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3889{
d14921d6
NB		 3890 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3891 if (wait_for_tasks && cmd->se_tmr_req)
3892 transport_wait_for_tasks(cmd);
3893
35462975 3894 transport_release_cmd(cmd);
d14921d6
NB		 3895 } else {
3896 if (wait_for_tasks)
3897 transport_wait_for_tasks(cmd);
3898
c66ac9db
NB		 3899 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3900
82f1c8a4 3901 if (cmd->se_lun)
c66ac9db 3902 transport_lun_remove_cmd(cmd);
c66ac9db 3903
f4366772
NB		 3904 transport_free_dev_tasks(cmd);
3905
39c05f32 3906 transport_put_cmd(cmd);
c66ac9db
NB		 3907 }
3908}
3909EXPORT_SYMBOL(transport_generic_free_cmd);
3910
a17f091d
NB		 3911/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3912 * @se_sess: session to reference
3913 * @se_cmd: command descriptor to add
3914 */
3915void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3916{
3917 unsigned long flags;
3918
3919 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3920 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3921 se_cmd->check_release = 1;
3922 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3923}
3924EXPORT_SYMBOL(target_get_sess_cmd);
3925
3926/* target_put_sess_cmd - Check for active I/O shutdown or list delete
3927 * @se_sess: session to reference
3928 * @se_cmd: command descriptor to drop
3929 */
3930int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3931{
3932 unsigned long flags;
3933
3934 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3935 if (list_empty(&se_cmd->se_cmd_list)) {
3936 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3937 WARN_ON(1);
3938 return 0;
3939 }
3940
3941 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3942 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3943 complete(&se_cmd->cmd_wait_comp);
3944 return 1;
3945 }
3946 list_del(&se_cmd->se_cmd_list);
3947 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3948
3949 return 0;
3950}
3951EXPORT_SYMBOL(target_put_sess_cmd);
3952
3953/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3954 * @se_sess: session to split
3955 */
3956void target_splice_sess_cmd_list(struct se_session *se_sess)
3957{
3958 struct se_cmd *se_cmd;
3959 unsigned long flags;
3960
3961 WARN_ON(!list_empty(&se_sess->sess_wait_list));
3962 INIT_LIST_HEAD(&se_sess->sess_wait_list);
3963
3964 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3965 se_sess->sess_tearing_down = 1;
3966
3967 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3968
3969 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3970 se_cmd->cmd_wait_set = 1;
3971
3972 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3973}
3974EXPORT_SYMBOL(target_splice_sess_cmd_list);
3975
3976/* target_wait_for_sess_cmds - Wait for outstanding descriptors
3977 * @se_sess: session to wait for active I/O
3978 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3979 */
3980void target_wait_for_sess_cmds(
3981 struct se_session *se_sess,
3982 int wait_for_tasks)
3983{
3984 struct se_cmd *se_cmd, *tmp_cmd;
3985 bool rc = false;
3986
3987 list_for_each_entry_safe(se_cmd, tmp_cmd,
3988 &se_sess->sess_wait_list, se_cmd_list) {
3989 list_del(&se_cmd->se_cmd_list);
3990
3991 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3992 " %d\n", se_cmd, se_cmd->t_state,
3993 se_cmd->se_tfo->get_cmd_state(se_cmd));
3994
3995 if (wait_for_tasks) {
3996 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3997 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3998 se_cmd->se_tfo->get_cmd_state(se_cmd));
3999
4000 rc = transport_wait_for_tasks(se_cmd);
4001
4002 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4003 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4004 se_cmd->se_tfo->get_cmd_state(se_cmd));
4005 }
4006
4007 if (!rc) {
4008 wait_for_completion(&se_cmd->cmd_wait_comp);
4009 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4010 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4011 se_cmd->se_tfo->get_cmd_state(se_cmd));
4012 }
4013
4014 se_cmd->se_tfo->release_cmd(se_cmd);
4015 }
4016}
4017EXPORT_SYMBOL(target_wait_for_sess_cmds);
4018
c66ac9db
NB		 4019/* transport_lun_wait_for_tasks():
4020 *
4021 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4022 * an struct se_lun to be successfully shutdown.
4023 */
4024static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4025{
4026 unsigned long flags;
4027 int ret;
4028 /*
4029 * If the frontend has already requested this struct se_cmd to
4030 * be stopped, we can safely ignore this struct se_cmd.
4031 */
a1d8b49a
AG		 4032 spin_lock_irqsave(&cmd->t_state_lock, flags);
4033 if (atomic_read(&cmd->t_transport_stop)) {
4034 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4035 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4036 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4037 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4038 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4039 return -EPERM;
c66ac9db 4040 }
a1d8b49a
AG		 4041 atomic_set(&cmd->transport_lun_fe_stop, 1);
4042 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4043
5951146d 4044 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4045
4046 ret = transport_stop_tasks_for_cmd(cmd);
4047
6708bb27
AG		 4048 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4049 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4050 if (!ret) {
6708bb27 4051 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4052 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4053 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4054 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4055 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4056 }
3df8d40b 4057 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4058
4059 return 0;
4060}
4061
c66ac9db
NB		 4062static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4063{
4064 struct se_cmd *cmd = NULL;
4065 unsigned long lun_flags, cmd_flags;
4066 /*
4067 * Do exception processing and return CHECK_CONDITION status to the
4068 * Initiator Port.
4069 */
4070 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4071 while (!list_empty(&lun->lun_cmd_list)) {
4072 cmd = list_first_entry(&lun->lun_cmd_list,
4073 struct se_cmd, se_lun_node);
4074 list_del(&cmd->se_lun_node);
4075
a1d8b49a 4076 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4077 /*
4078 * This will notify iscsi_target_transport.c:
4079 * transport_cmd_check_stop() that a LUN shutdown is in
4080 * progress for the iscsi_cmd_t.
4081 */
a1d8b49a 4082 spin_lock(&cmd->t_state_lock);
6708bb27 4083 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4084 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4085 cmd->se_lun->unpacked_lun,
4086 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4087 atomic_set(&cmd->transport_lun_stop, 1);
4088 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4089
4090 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4091
6708bb27
AG		 4092 if (!cmd->se_lun) {
4093 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4094 cmd->se_tfo->get_task_tag(cmd),
4095 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4096 BUG();
4097 }
4098 /*
4099 * If the Storage engine still owns the iscsi_cmd_t, determine
4100 * and/or stop its context.
4101 */
6708bb27 4102 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4103 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4104 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4105
e3d6f909 4106 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4107 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4108 continue;
4109 }
4110
6708bb27 4111 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4112 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4113 cmd->se_lun->unpacked_lun,
4114 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4115
a1d8b49a 4116 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4117 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4118 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4119 goto check_cond;
4120 }
a1d8b49a 4121 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4122 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4123 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4124
4125 transport_free_dev_tasks(cmd);
4126 /*
4127 * The Storage engine stopped this struct se_cmd before it was
4128 * send to the fabric frontend for delivery back to the
4129 * Initiator Node. Return this SCSI CDB back with an
4130 * CHECK_CONDITION status.
4131 */
4132check_cond:
4133 transport_send_check_condition_and_sense(cmd,
4134 TCM_NON_EXISTENT_LUN, 0);
4135 /*
4136 * If the fabric frontend is waiting for this iscsi_cmd_t to
4137 * be released, notify the waiting thread now that LU has
4138 * finished accessing it.
4139 */
a1d8b49a
AG		 4140 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4141 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4142 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4143 " struct se_cmd: %p ITT: 0x%08x\n",
4144 lun->unpacked_lun,
e3d6f909 4145 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4146
a1d8b49a 4147 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4148 cmd_flags);
4149 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4150 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4151 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4152 continue;
4153 }
6708bb27 4154 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4155 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4156
a1d8b49a 4157 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4158 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4159 }
4160 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4161}
4162
4163static int transport_clear_lun_thread(void *p)
4164{
4165 struct se_lun *lun = (struct se_lun *)p;
4166
4167 __transport_clear_lun_from_sessions(lun);
4168 complete(&lun->lun_shutdown_comp);
4169
4170 return 0;
4171}
4172
4173int transport_clear_lun_from_sessions(struct se_lun *lun)
4174{
4175 struct task_struct *kt;
4176
5951146d 4177 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4178 "tcm_cl_%u", lun->unpacked_lun);
4179 if (IS_ERR(kt)) {
6708bb27 4180 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4181 return PTR_ERR(kt);
c66ac9db
NB		 4182 }
4183 wait_for_completion(&lun->lun_shutdown_comp);
4184
4185 return 0;
4186}
4187
d14921d6
NB		 4188/**
4189 * transport_wait_for_tasks - wait for completion to occur
4190 * @cmd: command to wait
c66ac9db 4191 *
d14921d6
NB		 4192 * Called from frontend fabric context to wait for storage engine
4193 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4194 */
a17f091d 4195bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4196{
4197 unsigned long flags;
4198
a1d8b49a 4199 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4200 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4201 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4202 return false;
d14921d6
NB		 4203 }
4204 /*
4205 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4206 * has been set in transport_set_supported_SAM_opcode().
4207 */
4208 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4209 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4210 return false;
d14921d6 4211 }
c66ac9db
NB		 4212 /*
4213 * If we are already stopped due to an external event (ie: LUN shutdown)
4214 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4215 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4216 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4217 * has completed its operation on the struct se_cmd.
4218 */
a1d8b49a 4219 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4220
6708bb27 4221 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4222 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4223 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4224 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4225 /*
4226 * There is a special case for WRITES where a FE exception +
4227 * LUN shutdown means ConfigFS context is still sleeping on
4228 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4229 * We go ahead and up transport_lun_stop_comp just to be sure
4230 * here.
4231 */
a1d8b49a
AG		 4232 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4233 complete(&cmd->transport_lun_stop_comp);
4234 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4235 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4236
4237 transport_all_task_dev_remove_state(cmd);
4238 /*
4239 * At this point, the frontend who was the originator of this
4240 * struct se_cmd, now owns the structure and can be released through
4241 * normal means below.
4242 */
6708bb27 4243 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4244 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4245 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4246 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4247
a1d8b49a 4248 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4249 }
a1d8b49a 4250 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4251 atomic_read(&cmd->t_transport_aborted)) {
4252 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4253 return false;
d14921d6 4254 }
c66ac9db 4255
a1d8b49a 4256 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4257
6708bb27 4258 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
f2da9dbd
CH		 4259 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4260 cmd, cmd->se_tfo->get_task_tag(cmd),
4261 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4262
a1d8b49a 4263 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4264
5951146d 4265 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4266
a1d8b49a 4267 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4268
a1d8b49a
AG		 4269 spin_lock_irqsave(&cmd->t_state_lock, flags);
4270 atomic_set(&cmd->t_transport_active, 0);
4271 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4272
6708bb27 4273 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4274 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4275 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4276
d14921d6 4277 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4278
4279 return true;
c66ac9db 4280}
d14921d6 4281EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4282
4283static int transport_get_sense_codes(
4284 struct se_cmd *cmd,
4285 u8 *asc,
4286 u8 *ascq)
4287{
4288 *asc = cmd->scsi_asc;
4289 *ascq = cmd->scsi_ascq;
4290
4291 return 0;
4292}
4293
4294static int transport_set_sense_codes(
4295 struct se_cmd *cmd,
4296 u8 asc,
4297 u8 ascq)
4298{
4299 cmd->scsi_asc = asc;
4300 cmd->scsi_ascq = ascq;
4301
4302 return 0;
4303}
4304
4305int transport_send_check_condition_and_sense(
4306 struct se_cmd *cmd,
4307 u8 reason,
4308 int from_transport)
4309{
4310 unsigned char *buffer = cmd->sense_buffer;
4311 unsigned long flags;
4312 int offset;
4313 u8 asc = 0, ascq = 0;
4314
a1d8b49a 4315 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4316 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4317 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4318 return 0;
4319 }
4320 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4321 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4322
4323 if (!reason && from_transport)
4324 goto after_reason;
4325
4326 if (!from_transport)
4327 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4328 /*
4329 * Data Segment and SenseLength of the fabric response PDU.
4330 *
4331 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4332 * from include/scsi/scsi_cmnd.h
4333 */
e3d6f909 4334 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4335 TRANSPORT_SENSE_BUFFER);
4336 /*
4337 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4338 * SENSE KEY values from include/scsi/scsi.h
4339 */
4340 switch (reason) {
4341 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4342 /* CURRENT ERROR */
4343 buffer[offset] = 0x70;
4344 /* ILLEGAL REQUEST */
4345 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4346 /* LOGICAL UNIT NOT SUPPORTED */
4347 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4348 break;
c66ac9db
NB		 4349 case TCM_UNSUPPORTED_SCSI_OPCODE:
4350 case TCM_SECTOR_COUNT_TOO_MANY:
4351 /* CURRENT ERROR */
4352 buffer[offset] = 0x70;
4353 /* ILLEGAL REQUEST */
4354 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4355 /* INVALID COMMAND OPERATION CODE */
4356 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4357 break;
4358 case TCM_UNKNOWN_MODE_PAGE:
4359 /* CURRENT ERROR */
4360 buffer[offset] = 0x70;
4361 /* ILLEGAL REQUEST */
4362 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4363 /* INVALID FIELD IN CDB */
4364 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4365 break;
4366 case TCM_CHECK_CONDITION_ABORT_CMD:
4367 /* CURRENT ERROR */
4368 buffer[offset] = 0x70;
4369 /* ABORTED COMMAND */
4370 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4371 /* BUS DEVICE RESET FUNCTION OCCURRED */
4372 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4373 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4374 break;
4375 case TCM_INCORRECT_AMOUNT_OF_DATA:
4376 /* CURRENT ERROR */
4377 buffer[offset] = 0x70;
4378 /* ABORTED COMMAND */
4379 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4380 /* WRITE ERROR */
4381 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4382 /* NOT ENOUGH UNSOLICITED DATA */
4383 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4384 break;
4385 case TCM_INVALID_CDB_FIELD:
4386 /* CURRENT ERROR */
4387 buffer[offset] = 0x70;
4388 /* ABORTED COMMAND */
4389 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4390 /* INVALID FIELD IN CDB */
4391 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4392 break;
4393 case TCM_INVALID_PARAMETER_LIST:
4394 /* CURRENT ERROR */
4395 buffer[offset] = 0x70;
4396 /* ABORTED COMMAND */
4397 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4398 /* INVALID FIELD IN PARAMETER LIST */
4399 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4400 break;
4401 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4402 /* CURRENT ERROR */
4403 buffer[offset] = 0x70;
4404 /* ABORTED COMMAND */
4405 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4406 /* WRITE ERROR */
4407 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4408 /* UNEXPECTED_UNSOLICITED_DATA */
4409 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4410 break;
4411 case TCM_SERVICE_CRC_ERROR:
4412 /* CURRENT ERROR */
4413 buffer[offset] = 0x70;
4414 /* ABORTED COMMAND */
4415 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4416 /* PROTOCOL SERVICE CRC ERROR */
4417 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4418 /* N/A */
4419 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4420 break;
4421 case TCM_SNACK_REJECTED:
4422 /* CURRENT ERROR */
4423 buffer[offset] = 0x70;
4424 /* ABORTED COMMAND */
4425 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4426 /* READ ERROR */
4427 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4428 /* FAILED RETRANSMISSION REQUEST */
4429 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4430 break;
4431 case TCM_WRITE_PROTECTED:
4432 /* CURRENT ERROR */
4433 buffer[offset] = 0x70;
4434 /* DATA PROTECT */
4435 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4436 /* WRITE PROTECTED */
4437 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4438 break;
4439 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4440 /* CURRENT ERROR */
4441 buffer[offset] = 0x70;
4442 /* UNIT ATTENTION */
4443 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4444 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4445 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4446 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4447 break;
4448 case TCM_CHECK_CONDITION_NOT_READY:
4449 /* CURRENT ERROR */
4450 buffer[offset] = 0x70;
4451 /* Not Ready */
4452 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4453 transport_get_sense_codes(cmd, &asc, &ascq);
4454 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4455 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4456 break;
4457 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4458 default:
4459 /* CURRENT ERROR */
4460 buffer[offset] = 0x70;
4461 /* ILLEGAL REQUEST */
4462 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4463 /* LOGICAL UNIT COMMUNICATION FAILURE */
4464 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4465 break;
4466 }
4467 /*
4468 * This code uses linux/include/scsi/scsi.h SAM status codes!
4469 */
4470 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4471 /*
4472 * Automatically padded, this value is encoded in the fabric's
4473 * data_length response PDU containing the SCSI defined sense data.
4474 */
4475 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4476
4477after_reason:
07bde79a 4478 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4479}
4480EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4481
4482int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4483{
4484 int ret = 0;
4485
a1d8b49a 4486 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4487 if (!send_status ||
c66ac9db
NB		 4488 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4489 return 1;
4490#if 0
6708bb27 4491 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4492 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4493 cmd->t_task_cdb[0],
e3d6f909 4494 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4495#endif
4496 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4497 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4498 ret = 1;
4499 }
4500 return ret;
4501}
4502EXPORT_SYMBOL(transport_check_aborted_status);
4503
4504void transport_send_task_abort(struct se_cmd *cmd)
4505{
c252f003
NB		 4506 unsigned long flags;
4507
4508 spin_lock_irqsave(&cmd->t_state_lock, flags);
4509 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4510 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4511 return;
4512 }
4513 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4514
c66ac9db
NB		 4515 /*
4516 * If there are still expected incoming fabric WRITEs, we wait
4517 * until until they have completed before sending a TASK_ABORTED
4518 * response. This response with TASK_ABORTED status will be
4519 * queued back to fabric module by transport_check_aborted_status().
4520 */
4521 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4522 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4523 atomic_inc(&cmd->t_transport_aborted);
c66ac9db 4524 smp_mb__after_atomic_inc();
c66ac9db
NB		 4525 }
4526 }
4527 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4528#if 0
6708bb27 4529 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4530 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4531 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4532#endif
e3d6f909 4533 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4534}
4535
e26d99ae 4536static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4537{
5951146d 4538 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4539 struct se_tmr_req *tmr = cmd->se_tmr_req;
4540 int ret;
4541
4542 switch (tmr->function) {
5c6cd613 4543 case TMR_ABORT_TASK:
c66ac9db
NB		 4544 tmr->response = TMR_FUNCTION_REJECTED;
4545 break;
5c6cd613
NB		 4546 case TMR_ABORT_TASK_SET:
4547 case TMR_CLEAR_ACA:
4548 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4549 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4550 break;
5c6cd613 4551 case TMR_LUN_RESET:
c66ac9db
NB		 4552 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4553 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4554 TMR_FUNCTION_REJECTED;
4555 break;
5c6cd613 4556 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4557 tmr->response = TMR_FUNCTION_REJECTED;
4558 break;
5c6cd613 4559 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4560 tmr->response = TMR_FUNCTION_REJECTED;
4561 break;
c66ac9db 4562 default:
6708bb27 4563 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4564 tmr->function);
4565 tmr->response = TMR_FUNCTION_REJECTED;
4566 break;
4567 }
4568
4569 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4570 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4571
b7b8bef7 4572 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4573 return 0;
4574}
4575
c66ac9db
NB		 4576/* transport_processing_thread():
4577 *
4578 *
4579 */
4580static int transport_processing_thread(void *param)
4581{
5951146d 4582 int ret;
c66ac9db
NB		 4583 struct se_cmd *cmd;
4584 struct se_device *dev = (struct se_device *) param;
c66ac9db 4585
c66ac9db 4586 while (!kthread_should_stop()) {
e3d6f909
AG		 4587 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4588 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4589 kthread_should_stop());
4590 if (ret < 0)
4591 goto out;
4592
c66ac9db
NB		 4593get_cmd:
4594 __transport_execute_tasks(dev);
4595
5951146d
AG		 4596 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4597 if (!cmd)
c66ac9db
NB		 4598 continue;
4599
5951146d 4600 switch (cmd->t_state) {
680b73c5
CH		 4601 case TRANSPORT_NEW_CMD:
4602 BUG();
4603 break;
c66ac9db 4604 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4605 if (!cmd->se_tfo->new_cmd_map) {
4606 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4607 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4608 BUG();
4609 }
e3d6f909 4610 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4611 if (ret < 0) {
03e98c9e 4612 transport_generic_request_failure(cmd);
c66ac9db
NB		 4613 break;
4614 }
c66ac9db 4615 ret = transport_generic_new_cmd(cmd);
f147abb4 4616 if (ret < 0) {
03e98c9e
NB		 4617 transport_generic_request_failure(cmd);
4618 break;
c66ac9db
NB		 4619 }
4620 break;
4621 case TRANSPORT_PROCESS_WRITE:
4622 transport_generic_process_write(cmd);
4623 break;
c66ac9db
NB		 4624 case TRANSPORT_PROCESS_TMR:
4625 transport_generic_do_tmr(cmd);
4626 break;
07bde79a 4627 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4628 transport_write_pending_qf(cmd);
4629 break;
4630 case TRANSPORT_COMPLETE_QF_OK:
4631 transport_complete_qf(cmd);
07bde79a 4632 break;
c66ac9db 4633 default:
f2da9dbd
CH		 4634 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4635 "i_state: %d on SE LUN: %u\n",
4636 cmd->t_state,
e3d6f909
AG		 4637 cmd->se_tfo->get_task_tag(cmd),
4638 cmd->se_tfo->get_cmd_state(cmd),
4639 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4640 BUG();
4641 }
4642
4643 goto get_cmd;
4644 }
4645
4646out:
ce8762f6
NB		 4647 WARN_ON(!list_empty(&dev->state_task_list));
4648 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4649 dev->process_thread = NULL;
4650 return 0;
4651}
Linux kernel - Deliverables
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