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[mirror_ubuntu-artful-kernel.git] / drivers / target / target_core_transport.c
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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
c66ac9db 424 spin_lock_irqsave(&dev->execute_task_lock, flags);
1880807a
CH		 425 if (task->t_state_active) {
426 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
427 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db 428
1880807a
CH		 429 list_del(&task->t_state_list);
430 atomic_dec(&cmd->t_task_cdbs_ex_left);
431 task->t_state_active = false;
432 }
433 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db 434 }
1880807a 435
c66ac9db
NB		 436}
437
438/* transport_cmd_check_stop():
439 *
440 * 'transport_off = 1' determines if t_transport_active should be cleared.
441 * 'transport_off = 2' determines if task_dev_state should be removed.
442 *
443 * A non-zero u8 t_state sets cmd->t_state.
444 * Returns 1 when command is stopped, else 0.
445 */
446static int transport_cmd_check_stop(
447 struct se_cmd *cmd,
448 int transport_off,
449 u8 t_state)
450{
451 unsigned long flags;
452
a1d8b49a 453 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 454 /*
455 * Determine if IOCTL context caller in requesting the stopping of this
456 * command for LUN shutdown purposes.
457 */
a1d8b49a 458 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 459 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 460 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 461 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 462
a1d8b49a 463 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 464 if (transport_off == 2)
465 transport_all_task_dev_remove_state(cmd);
a1d8b49a 466 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 467
a1d8b49a 468 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 469 return 1;
470 }
471 /*
472 * Determine if frontend context caller is requesting the stopping of
e3d6f909 473 * this command for frontend exceptions.
c66ac9db 474 */
a1d8b49a 475 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 476 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 477 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 478 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 479
c66ac9db
NB		 480 if (transport_off == 2)
481 transport_all_task_dev_remove_state(cmd);
482
483 /*
484 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
485 * to FE.
486 */
487 if (transport_off == 2)
488 cmd->se_lun = NULL;
a1d8b49a 489 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 490
a1d8b49a 491 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 492 return 1;
493 }
494 if (transport_off) {
a1d8b49a 495 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 496 if (transport_off == 2) {
497 transport_all_task_dev_remove_state(cmd);
498 /*
499 * Clear struct se_cmd->se_lun before the transport_off == 2
500 * handoff to fabric module.
501 */
502 cmd->se_lun = NULL;
503 /*
504 * Some fabric modules like tcm_loop can release
25985edc 505 * their internally allocated I/O reference now and
c66ac9db 506 * struct se_cmd now.
88dd9e26
NB		 507 *
508 * Fabric modules are expected to return '1' here if the
509 * se_cmd being passed is released at this point,
510 * or zero if not being released.
c66ac9db 511 */
e3d6f909 512 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 513 spin_unlock_irqrestore(
a1d8b49a 514 &cmd->t_state_lock, flags);
c66ac9db 515
88dd9e26 516 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 517 }
518 }
a1d8b49a 519 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 520
521 return 0;
522 } else if (t_state)
523 cmd->t_state = t_state;
a1d8b49a 524 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 525
526 return 0;
527}
528
529static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
530{
531 return transport_cmd_check_stop(cmd, 2, 0);
532}
533
534static void transport_lun_remove_cmd(struct se_cmd *cmd)
535{
e3d6f909 536 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 537 unsigned long flags;
538
539 if (!lun)
540 return;
541
a1d8b49a 542 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 543 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 545 goto check_lun;
546 }
a1d8b49a 547 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 548 transport_all_task_dev_remove_state(cmd);
a1d8b49a 549 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 550
c66ac9db
NB		 551
552check_lun:
553 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 554 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 555 list_del(&cmd->se_lun_node);
a1d8b49a 556 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 557#if 0
6708bb27 558 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 559 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 560#endif
561 }
562 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
563}
564
565void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
566{
8dc52b54
NB		 567 if (!cmd->se_tmr_req)
568 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 569
570 if (transport_cmd_check_stop_to_fabric(cmd))
571 return;
77039d1e 572 if (remove) {
3df8d40b 573 transport_remove_cmd_from_queue(cmd);
e6a2573f 574 transport_put_cmd(cmd);
77039d1e 575 }
c66ac9db
NB		 576}
577
f7a5cc0b
CH		 578static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
579 bool at_head)
c66ac9db
NB		 580{
581 struct se_device *dev = cmd->se_dev;
e3d6f909 582 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 583 unsigned long flags;
584
c66ac9db 585 if (t_state) {
a1d8b49a 586 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 587 cmd->t_state = t_state;
a1d8b49a
AG		 588 atomic_set(&cmd->t_transport_active, 1);
589 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 590 }
591
592 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 593
594 /* If the cmd is already on the list, remove it before we add it */
595 if (!list_empty(&cmd->se_queue_node))
596 list_del(&cmd->se_queue_node);
597 else
598 atomic_inc(&qobj->queue_cnt);
599
f7a5cc0b 600 if (at_head)
07bde79a 601 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 602 else
07bde79a 603 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 604 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 605 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
606
c66ac9db 607 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 608}
609
5951146d
AG		 610static struct se_cmd *
611transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 612{
5951146d 613 struct se_cmd *cmd;
c66ac9db
NB		 614 unsigned long flags;
615
616 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
617 if (list_empty(&qobj->qobj_list)) {
618 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
619 return NULL;
620 }
5951146d 621 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 622
79a7fef2 623 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 624
79a7fef2 625 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 626 atomic_dec(&qobj->queue_cnt);
627 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
628
5951146d 629 return cmd;
c66ac9db
NB		 630}
631
3df8d40b 632static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 633{
3df8d40b 634 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 635 unsigned long flags;
636
637 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 638 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 639 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
640 return;
641 }
79a7fef2
RD		 642 atomic_set(&cmd->t_transport_queue_active, 0);
643 atomic_dec(&qobj->queue_cnt);
644 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 645 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
646
a1d8b49a 647 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 648 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 649 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 650 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 651 }
652}
653
654/*
655 * Completion function used by TCM subsystem plugins (such as FILEIO)
656 * for queueing up response from struct se_subsystem_api->do_task()
657 */
658void transport_complete_sync_cache(struct se_cmd *cmd, int good)
659{
a1d8b49a 660 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 661 struct se_task, t_list);
662
663 if (good) {
664 cmd->scsi_status = SAM_STAT_GOOD;
665 task->task_scsi_status = GOOD;
666 } else {
667 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
03e98c9e
NB		 668 task->task_se_cmd->scsi_sense_reason =
669 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
670
c66ac9db
NB		 671 }
672
673 transport_complete_task(task, good);
674}
675EXPORT_SYMBOL(transport_complete_sync_cache);
676
35e0e757
CH		 677static void target_complete_failure_work(struct work_struct *work)
678{
679 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
680
03e98c9e 681 transport_generic_request_failure(cmd);
35e0e757
CH		 682}
683
c66ac9db
NB		 684/* transport_complete_task():
685 *
686 * Called from interrupt and non interrupt context depending
687 * on the transport plugin.
688 */
689void transport_complete_task(struct se_task *task, int success)
690{
e3d6f909 691 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 692 struct se_device *dev = cmd->se_dev;
c66ac9db
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
1880807a 816 if (task->t_state_active)
c66ac9db
NB		 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
1880807a 830 task->t_state_active = true;
c66ac9db 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 845 spin_lock(&dev->execute_task_lock);
1880807a
CH		 846 if (!task->t_state_active) {
847 list_add_tail(&task->t_state_list,
848 &dev->state_task_list);
849 task->t_state_active = true;
850
851 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
852 task->task_se_cmd->se_tfo->get_task_tag(
853 task->task_se_cmd), task, dev);
854 }
c66ac9db
NB		 855 spin_unlock(&dev->execute_task_lock);
856 }
a1d8b49a 857 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 858}
859
860static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
861{
5951146d 862 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 863 struct se_task *task, *task_prev = NULL;
864 unsigned long flags;
865
866 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 867 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 868 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 869 continue;
870 /*
871 * __transport_add_task_to_execute_queue() handles the
872 * SAM Task Attribute emulation if enabled
873 */
874 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 875 task_prev = task;
876 }
877 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 878}
879
04629b7b
CH		 880void __transport_remove_task_from_execute_queue(struct se_task *task,
881 struct se_device *dev)
882{
883 list_del_init(&task->t_execute_list);
884 atomic_dec(&dev->execute_tasks);
885}
886
e26d99ae 887static void transport_remove_task_from_execute_queue(
c66ac9db
NB		 888 struct se_task *task,
889 struct se_device *dev)
890{
891 unsigned long flags;
892
04629b7b 893 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 894 return;
af57c3ac 895
c66ac9db 896 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 897 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 898 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
899}
900
07bde79a 901/*
f147abb4 902 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 903 */
904
905static void target_qf_do_work(struct work_struct *work)
906{
907 struct se_device *dev = container_of(work, struct se_device,
908 qf_work_queue);
bcac364a 909 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 910 struct se_cmd *cmd, *cmd_tmp;
911
912 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 913 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
914 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 915
bcac364a 916 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 917 list_del(&cmd->se_qf_node);
918 atomic_dec(&dev->dev_qf_count);
919 smp_mb__after_atomic_dec();
07bde79a 920
6708bb27 921 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 922 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 923 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 924 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
925 : "UNKNOWN");
f7a5cc0b
CH		 926
927 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 928 }
07bde79a
NB		 929}
930
c66ac9db
NB		 931unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
932{
933 switch (cmd->data_direction) {
934 case DMA_NONE:
935 return "NONE";
936 case DMA_FROM_DEVICE:
937 return "READ";
938 case DMA_TO_DEVICE:
939 return "WRITE";
940 case DMA_BIDIRECTIONAL:
941 return "BIDI";
942 default:
943 break;
944 }
945
946 return "UNKNOWN";
947}
948
949void transport_dump_dev_state(
950 struct se_device *dev,
951 char *b,
952 int *bl)
953{
954 *bl += sprintf(b + *bl, "Status: ");
955 switch (dev->dev_status) {
956 case TRANSPORT_DEVICE_ACTIVATED:
957 *bl += sprintf(b + *bl, "ACTIVATED");
958 break;
959 case TRANSPORT_DEVICE_DEACTIVATED:
960 *bl += sprintf(b + *bl, "DEACTIVATED");
961 break;
962 case TRANSPORT_DEVICE_SHUTDOWN:
963 *bl += sprintf(b + *bl, "SHUTDOWN");
964 break;
965 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
966 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
967 *bl += sprintf(b + *bl, "OFFLINE");
968 break;
969 default:
970 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
971 break;
972 }
973
974 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
975 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
976 dev->queue_depth);
977 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 978 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 979 *bl += sprintf(b + *bl, " ");
980}
981
c66ac9db
NB		 982void transport_dump_vpd_proto_id(
983 struct t10_vpd *vpd,
984 unsigned char *p_buf,
985 int p_buf_len)
986{
987 unsigned char buf[VPD_TMP_BUF_SIZE];
988 int len;
989
990 memset(buf, 0, VPD_TMP_BUF_SIZE);
991 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
992
993 switch (vpd->protocol_identifier) {
994 case 0x00:
995 sprintf(buf+len, "Fibre Channel\n");
996 break;
997 case 0x10:
998 sprintf(buf+len, "Parallel SCSI\n");
999 break;
1000 case 0x20:
1001 sprintf(buf+len, "SSA\n");
1002 break;
1003 case 0x30:
1004 sprintf(buf+len, "IEEE 1394\n");
1005 break;
1006 case 0x40:
1007 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1008 " Protocol\n");
1009 break;
1010 case 0x50:
1011 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1012 break;
1013 case 0x60:
1014 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1015 break;
1016 case 0x70:
1017 sprintf(buf+len, "Automation/Drive Interface Transport"
1018 " Protocol\n");
1019 break;
1020 case 0x80:
1021 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1022 break;
1023 default:
1024 sprintf(buf+len, "Unknown 0x%02x\n",
1025 vpd->protocol_identifier);
1026 break;
1027 }
1028
1029 if (p_buf)
1030 strncpy(p_buf, buf, p_buf_len);
1031 else
6708bb27 1032 pr_debug("%s", buf);
c66ac9db
NB		 1033}
1034
1035void
1036transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1037{
1038 /*
1039 * Check if the Protocol Identifier Valid (PIV) bit is set..
1040 *
1041 * from spc3r23.pdf section 7.5.1
1042 */
1043 if (page_83[1] & 0x80) {
1044 vpd->protocol_identifier = (page_83[0] & 0xf0);
1045 vpd->protocol_identifier_set = 1;
1046 transport_dump_vpd_proto_id(vpd, NULL, 0);
1047 }
1048}
1049EXPORT_SYMBOL(transport_set_vpd_proto_id);
1050
1051int transport_dump_vpd_assoc(
1052 struct t10_vpd *vpd,
1053 unsigned char *p_buf,
1054 int p_buf_len)
1055{
1056 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1057 int ret = 0;
1058 int len;
c66ac9db
NB		 1059
1060 memset(buf, 0, VPD_TMP_BUF_SIZE);
1061 len = sprintf(buf, "T10 VPD Identifier Association: ");
1062
1063 switch (vpd->association) {
1064 case 0x00:
1065 sprintf(buf+len, "addressed logical unit\n");
1066 break;
1067 case 0x10:
1068 sprintf(buf+len, "target port\n");
1069 break;
1070 case 0x20:
1071 sprintf(buf+len, "SCSI target device\n");
1072 break;
1073 default:
1074 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1075 ret = -EINVAL;
c66ac9db
NB		 1076 break;
1077 }
1078
1079 if (p_buf)
1080 strncpy(p_buf, buf, p_buf_len);
1081 else
6708bb27 1082 pr_debug("%s", buf);
c66ac9db
NB		 1083
1084 return ret;
1085}
1086
1087int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1088{
1089 /*
1090 * The VPD identification association..
1091 *
1092 * from spc3r23.pdf Section 7.6.3.1 Table 297
1093 */
1094 vpd->association = (page_83[1] & 0x30);
1095 return transport_dump_vpd_assoc(vpd, NULL, 0);
1096}
1097EXPORT_SYMBOL(transport_set_vpd_assoc);
1098
1099int transport_dump_vpd_ident_type(
1100 struct t10_vpd *vpd,
1101 unsigned char *p_buf,
1102 int p_buf_len)
1103{
1104 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1105 int ret = 0;
1106 int len;
c66ac9db
NB		 1107
1108 memset(buf, 0, VPD_TMP_BUF_SIZE);
1109 len = sprintf(buf, "T10 VPD Identifier Type: ");
1110
1111 switch (vpd->device_identifier_type) {
1112 case 0x00:
1113 sprintf(buf+len, "Vendor specific\n");
1114 break;
1115 case 0x01:
1116 sprintf(buf+len, "T10 Vendor ID based\n");
1117 break;
1118 case 0x02:
1119 sprintf(buf+len, "EUI-64 based\n");
1120 break;
1121 case 0x03:
1122 sprintf(buf+len, "NAA\n");
1123 break;
1124 case 0x04:
1125 sprintf(buf+len, "Relative target port identifier\n");
1126 break;
1127 case 0x08:
1128 sprintf(buf+len, "SCSI name string\n");
1129 break;
1130 default:
1131 sprintf(buf+len, "Unsupported: 0x%02x\n",
1132 vpd->device_identifier_type);
e3d6f909 1133 ret = -EINVAL;
c66ac9db
NB		 1134 break;
1135 }
1136
e3d6f909
AG		 1137 if (p_buf) {
1138 if (p_buf_len < strlen(buf)+1)
1139 return -EINVAL;
c66ac9db 1140 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1141 } else {
6708bb27 1142 pr_debug("%s", buf);
e3d6f909 1143 }
c66ac9db
NB		 1144
1145 return ret;
1146}
1147
1148int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1149{
1150 /*
1151 * The VPD identifier type..
1152 *
1153 * from spc3r23.pdf Section 7.6.3.1 Table 298
1154 */
1155 vpd->device_identifier_type = (page_83[1] & 0x0f);
1156 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1157}
1158EXPORT_SYMBOL(transport_set_vpd_ident_type);
1159
1160int transport_dump_vpd_ident(
1161 struct t10_vpd *vpd,
1162 unsigned char *p_buf,
1163 int p_buf_len)
1164{
1165 unsigned char buf[VPD_TMP_BUF_SIZE];
1166 int ret = 0;
1167
1168 memset(buf, 0, VPD_TMP_BUF_SIZE);
1169
1170 switch (vpd->device_identifier_code_set) {
1171 case 0x01: /* Binary */
1172 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1173 &vpd->device_identifier[0]);
1174 break;
1175 case 0x02: /* ASCII */
1176 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1177 &vpd->device_identifier[0]);
1178 break;
1179 case 0x03: /* UTF-8 */
1180 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1181 &vpd->device_identifier[0]);
1182 break;
1183 default:
1184 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1185 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1186 ret = -EINVAL;
c66ac9db
NB		 1187 break;
1188 }
1189
1190 if (p_buf)
1191 strncpy(p_buf, buf, p_buf_len);
1192 else
6708bb27 1193 pr_debug("%s", buf);
c66ac9db
NB		 1194
1195 return ret;
1196}
1197
1198int
1199transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1200{
1201 static const char hex_str[] = "0123456789abcdef";
1202 int j = 0, i = 4; /* offset to start of the identifer */
1203
1204 /*
1205 * The VPD Code Set (encoding)
1206 *
1207 * from spc3r23.pdf Section 7.6.3.1 Table 296
1208 */
1209 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1210 switch (vpd->device_identifier_code_set) {
1211 case 0x01: /* Binary */
1212 vpd->device_identifier[j++] =
1213 hex_str[vpd->device_identifier_type];
1214 while (i < (4 + page_83[3])) {
1215 vpd->device_identifier[j++] =
1216 hex_str[(page_83[i] & 0xf0) >> 4];
1217 vpd->device_identifier[j++] =
1218 hex_str[page_83[i] & 0x0f];
1219 i++;
1220 }
1221 break;
1222 case 0x02: /* ASCII */
1223 case 0x03: /* UTF-8 */
1224 while (i < (4 + page_83[3]))
1225 vpd->device_identifier[j++] = page_83[i++];
1226 break;
1227 default:
1228 break;
1229 }
1230
1231 return transport_dump_vpd_ident(vpd, NULL, 0);
1232}
1233EXPORT_SYMBOL(transport_set_vpd_ident);
1234
1235static void core_setup_task_attr_emulation(struct se_device *dev)
1236{
1237 /*
1238 * If this device is from Target_Core_Mod/pSCSI, disable the
1239 * SAM Task Attribute emulation.
1240 *
1241 * This is currently not available in upsream Linux/SCSI Target
1242 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1243 */
e3d6f909 1244 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1245 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1246 return;
1247 }
1248
1249 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1250 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1251 " device\n", dev->transport->name,
1252 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1253}
1254
1255static void scsi_dump_inquiry(struct se_device *dev)
1256{
e3d6f909 1257 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1258 int i, device_type;
1259 /*
1260 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1261 */
6708bb27 1262 pr_debug(" Vendor: ");
c66ac9db
NB		 1263 for (i = 0; i < 8; i++)
1264 if (wwn->vendor[i] >= 0x20)
6708bb27 1265 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1266 else
6708bb27 1267 pr_debug(" ");
c66ac9db 1268
6708bb27 1269 pr_debug(" Model: ");
c66ac9db
NB		 1270 for (i = 0; i < 16; i++)
1271 if (wwn->model[i] >= 0x20)
6708bb27 1272 pr_debug("%c", wwn->model[i]);
c66ac9db 1273 else
6708bb27 1274 pr_debug(" ");
c66ac9db 1275
6708bb27 1276 pr_debug(" Revision: ");
c66ac9db
NB		 1277 for (i = 0; i < 4; i++)
1278 if (wwn->revision[i] >= 0x20)
6708bb27 1279 pr_debug("%c", wwn->revision[i]);
c66ac9db 1280 else
6708bb27 1281 pr_debug(" ");
c66ac9db 1282
6708bb27 1283 pr_debug("\n");
c66ac9db 1284
e3d6f909 1285 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1286 pr_debug(" Type: %s ", scsi_device_type(device_type));
1287 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1288 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1289}
1290
1291struct se_device *transport_add_device_to_core_hba(
1292 struct se_hba *hba,
1293 struct se_subsystem_api *transport,
1294 struct se_subsystem_dev *se_dev,
1295 u32 device_flags,
1296 void *transport_dev,
1297 struct se_dev_limits *dev_limits,
1298 const char *inquiry_prod,
1299 const char *inquiry_rev)
1300{
12a18bdc 1301 int force_pt;
c66ac9db
NB		 1302 struct se_device *dev;
1303
1304 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1305 if (!dev) {
1306 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1307 return NULL;
1308 }
c66ac9db 1309
e3d6f909 1310 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1311 dev->dev_flags = device_flags;
1312 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1313 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1314 dev->se_hba = hba;
1315 dev->se_sub_dev = se_dev;
1316 dev->transport = transport;
c66ac9db
NB		 1317 INIT_LIST_HEAD(&dev->dev_list);
1318 INIT_LIST_HEAD(&dev->dev_sep_list);
1319 INIT_LIST_HEAD(&dev->dev_tmr_list);
1320 INIT_LIST_HEAD(&dev->execute_task_list);
1321 INIT_LIST_HEAD(&dev->delayed_cmd_list);
c66ac9db 1322 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1323 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1324 spin_lock_init(&dev->execute_task_lock);
1325 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1326 spin_lock_init(&dev->dev_reservation_lock);
1327 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1328 spin_lock_init(&dev->se_port_lock);
1329 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1330 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1331
1332 dev->queue_depth = dev_limits->queue_depth;
1333 atomic_set(&dev->depth_left, dev->queue_depth);
1334 atomic_set(&dev->dev_ordered_id, 0);
1335
1336 se_dev_set_default_attribs(dev, dev_limits);
1337
1338 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1339 dev->creation_time = get_jiffies_64();
1340 spin_lock_init(&dev->stats_lock);
1341
1342 spin_lock(&hba->device_lock);
1343 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1344 hba->dev_count++;
1345 spin_unlock(&hba->device_lock);
1346 /*
1347 * Setup the SAM Task Attribute emulation for struct se_device
1348 */
1349 core_setup_task_attr_emulation(dev);
1350 /*
1351 * Force PR and ALUA passthrough emulation with internal object use.
1352 */
1353 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1354 /*
1355 * Setup the Reservations infrastructure for struct se_device
1356 */
1357 core_setup_reservations(dev, force_pt);
1358 /*
1359 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1360 */
1361 if (core_setup_alua(dev, force_pt) < 0)
1362 goto out;
1363
1364 /*
1365 * Startup the struct se_device processing thread
1366 */
1367 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1368 "LIO_%s", dev->transport->name);
c66ac9db 1369 if (IS_ERR(dev->process_thread)) {
6708bb27 1370 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1371 dev->transport->name);
c66ac9db
NB		 1372 goto out;
1373 }
07bde79a
NB		 1374 /*
1375 * Setup work_queue for QUEUE_FULL
1376 */
1377 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1378 /*
1379 * Preload the initial INQUIRY const values if we are doing
1380 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1381 * passthrough because this is being provided by the backend LLD.
1382 * This is required so that transport_get_inquiry() copies these
1383 * originals once back into DEV_T10_WWN(dev) for the virtual device
1384 * setup.
1385 */
e3d6f909 1386 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1387 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1388 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1389 " INQUIRY consts\n");
1390 goto out;
1391 }
1392
e3d6f909
AG		 1393 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1394 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1395 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1396 }
1397 scsi_dump_inquiry(dev);
1398
12a18bdc 1399 return dev;
c66ac9db 1400out:
c66ac9db
NB		 1401 kthread_stop(dev->process_thread);
1402
1403 spin_lock(&hba->device_lock);
1404 list_del(&dev->dev_list);
1405 hba->dev_count--;
1406 spin_unlock(&hba->device_lock);
1407
1408 se_release_vpd_for_dev(dev);
1409
c66ac9db
NB		 1410 kfree(dev);
1411
1412 return NULL;
1413}
1414EXPORT_SYMBOL(transport_add_device_to_core_hba);
1415
1416/* transport_generic_prepare_cdb():
1417 *
1418 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1419 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1420 * The point of this is since we are mapping iSCSI LUNs to
1421 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1422 * devices and HBAs for a loop.
1423 */
1424static inline void transport_generic_prepare_cdb(
1425 unsigned char *cdb)
1426{
1427 switch (cdb[0]) {
1428 case READ_10: /* SBC - RDProtect */
1429 case READ_12: /* SBC - RDProtect */
1430 case READ_16: /* SBC - RDProtect */
1431 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1432 case VERIFY: /* SBC - VRProtect */
1433 case VERIFY_16: /* SBC - VRProtect */
1434 case WRITE_VERIFY: /* SBC - VRProtect */
1435 case WRITE_VERIFY_12: /* SBC - VRProtect */
1436 break;
1437 default:
1438 cdb[1] &= 0x1f; /* clear logical unit number */
1439 break;
1440 }
1441}
1442
1443static struct se_task *
1444transport_generic_get_task(struct se_cmd *cmd,
1445 enum dma_data_direction data_direction)
1446{
1447 struct se_task *task;
5951146d 1448 struct se_device *dev = cmd->se_dev;
c66ac9db 1449
6708bb27 1450 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1451 if (!task) {
6708bb27 1452 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1453 return NULL;
1454 }
1455
1456 INIT_LIST_HEAD(&task->t_list);
1457 INIT_LIST_HEAD(&task->t_execute_list);
1458 INIT_LIST_HEAD(&task->t_state_list);
1459 init_completion(&task->task_stop_comp);
c66ac9db 1460 task->task_se_cmd = cmd;
c66ac9db
NB		 1461 task->task_data_direction = data_direction;
1462
c66ac9db
NB		 1463 return task;
1464}
1465
1466static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1467
c66ac9db
NB		 1468/*
1469 * Used by fabric modules containing a local struct se_cmd within their
1470 * fabric dependent per I/O descriptor.
1471 */
1472void transport_init_se_cmd(
1473 struct se_cmd *cmd,
1474 struct target_core_fabric_ops *tfo,
1475 struct se_session *se_sess,
1476 u32 data_length,
1477 int data_direction,
1478 int task_attr,
1479 unsigned char *sense_buffer)
1480{
5951146d
AG		 1481 INIT_LIST_HEAD(&cmd->se_lun_node);
1482 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1483 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1484 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1485 INIT_LIST_HEAD(&cmd->se_cmd_list);
a1d8b49a
AG		 1486 INIT_LIST_HEAD(&cmd->t_task_list);
1487 init_completion(&cmd->transport_lun_fe_stop_comp);
1488 init_completion(&cmd->transport_lun_stop_comp);
1489 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1490 init_completion(&cmd->cmd_wait_comp);
a1d8b49a
AG		 1491 spin_lock_init(&cmd->t_state_lock);
1492 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1493
1494 cmd->se_tfo = tfo;
1495 cmd->se_sess = se_sess;
1496 cmd->data_length = data_length;
1497 cmd->data_direction = data_direction;
1498 cmd->sam_task_attr = task_attr;
1499 cmd->sense_buffer = sense_buffer;
1500}
1501EXPORT_SYMBOL(transport_init_se_cmd);
1502
1503static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1504{
1505 /*
1506 * Check if SAM Task Attribute emulation is enabled for this
1507 * struct se_device storage object
1508 */
5951146d 1509 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1510 return 0;
1511
e66ecd50 1512 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1513 pr_debug("SAM Task Attribute ACA"
c66ac9db 1514 " emulation is not supported\n");
e3d6f909 1515 return -EINVAL;
c66ac9db
NB		 1516 }
1517 /*
1518 * Used to determine when ORDERED commands should go from
1519 * Dormant to Active status.
1520 */
5951146d 1521 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1522 smp_mb__after_atomic_inc();
6708bb27 1523 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1524 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1525 cmd->se_dev->transport->name);
c66ac9db
NB		 1526 return 0;
1527}
1528
c66ac9db
NB		 1529/* transport_generic_allocate_tasks():
1530 *
1531 * Called from fabric RX Thread.
1532 */
1533int transport_generic_allocate_tasks(
1534 struct se_cmd *cmd,
1535 unsigned char *cdb)
1536{
1537 int ret;
1538
1539 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1540 /*
1541 * Ensure that the received CDB is less than the max (252 + 8) bytes
1542 * for VARIABLE_LENGTH_CMD
1543 */
1544 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1545 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1546 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1547 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1548 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1549 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1550 return -EINVAL;
c66ac9db
NB		 1551 }
1552 /*
1553 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1554 * allocate the additional extended CDB buffer now.. Otherwise
1555 * setup the pointer from __t_task_cdb to t_task_cdb.
1556 */
a1d8b49a
AG		 1557 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1558 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1559 GFP_KERNEL);
6708bb27
AG		 1560 if (!cmd->t_task_cdb) {
1561 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1562 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1563 scsi_command_size(cdb),
a1d8b49a 1564 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1565 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1566 cmd->scsi_sense_reason =
1567 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1568 return -ENOMEM;
c66ac9db
NB		 1569 }
1570 } else
a1d8b49a 1571 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1572 /*
a1d8b49a 1573 * Copy the original CDB into cmd->
c66ac9db 1574 */
a1d8b49a 1575 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1576 /*
1577 * Setup the received CDB based on SCSI defined opcodes and
1578 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1579 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1580 * pointer is expected to be setup before we reach this point.
1581 */
1582 ret = transport_generic_cmd_sequencer(cmd, cdb);
1583 if (ret < 0)
1584 return ret;
1585 /*
1586 * Check for SAM Task Attribute Emulation
1587 */
1588 if (transport_check_alloc_task_attr(cmd) < 0) {
1589 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1590 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1591 return -EINVAL;
c66ac9db
NB		 1592 }
1593 spin_lock(&cmd->se_lun->lun_sep_lock);
1594 if (cmd->se_lun->lun_sep)
1595 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1596 spin_unlock(&cmd->se_lun->lun_sep_lock);
1597 return 0;
1598}
1599EXPORT_SYMBOL(transport_generic_allocate_tasks);
1600
695434e1
NB		 1601/*
1602 * Used by fabric module frontends to queue tasks directly.
1603 * Many only be used from process context only
1604 */
1605int transport_handle_cdb_direct(
1606 struct se_cmd *cmd)
1607{
dd8ae59d
NB		 1608 int ret;
1609
695434e1
NB		 1610 if (!cmd->se_lun) {
1611 dump_stack();
6708bb27 1612 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1613 return -EINVAL;
1614 }
1615 if (in_interrupt()) {
1616 dump_stack();
6708bb27 1617 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1618 " from interrupt context\n");
1619 return -EINVAL;
1620 }
dd8ae59d
NB		 1621 /*
1622 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1623 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1624 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1625 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1626 *
1627 * Also, we don't take cmd->t_state_lock here as we only expect
1628 * this to be called for initial descriptor submission.
1629 */
1630 cmd->t_state = TRANSPORT_NEW_CMD;
1631 atomic_set(&cmd->t_transport_active, 1);
1632 /*
1633 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1634 * so follow TRANSPORT_NEW_CMD processing thread context usage
1635 * and call transport_generic_request_failure() if necessary..
1636 */
1637 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1638 if (ret < 0)
1639 transport_generic_request_failure(cmd);
1640
dd8ae59d 1641 return 0;
695434e1
NB		 1642}
1643EXPORT_SYMBOL(transport_handle_cdb_direct);
1644
c66ac9db
NB		 1645/*
1646 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1647 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1648 * complete setup in TCM process context w/ TFO->new_cmd_map().
1649 */
1650int transport_generic_handle_cdb_map(
1651 struct se_cmd *cmd)
1652{
e3d6f909 1653 if (!cmd->se_lun) {
c66ac9db 1654 dump_stack();
6708bb27 1655 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1656 return -EINVAL;
c66ac9db
NB		 1657 }
1658
f7a5cc0b 1659 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1660 return 0;
1661}
1662EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1663
1664/* transport_generic_handle_data():
1665 *
1666 *
1667 */
1668int transport_generic_handle_data(
1669 struct se_cmd *cmd)
1670{
1671 /*
1672 * For the software fabric case, then we assume the nexus is being
1673 * failed/shutdown when signals are pending from the kthread context
1674 * caller, so we return a failure. For the HW target mode case running
1675 * in interrupt code, the signal_pending() check is skipped.
1676 */
1677 if (!in_interrupt() && signal_pending(current))
e3d6f909 1678 return -EPERM;
c66ac9db
NB		 1679 /*
1680 * If the received CDB has aleady been ABORTED by the generic
1681 * target engine, we now call transport_check_aborted_status()
1682 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1683 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1684 * sequences at this point.
1685 */
1686 if (transport_check_aborted_status(cmd, 1) != 0)
1687 return 0;
1688
f7a5cc0b 1689 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1690 return 0;
1691}
1692EXPORT_SYMBOL(transport_generic_handle_data);
1693
1694/* transport_generic_handle_tmr():
1695 *
1696 *
1697 */
1698int transport_generic_handle_tmr(
1699 struct se_cmd *cmd)
1700{
f7a5cc0b 1701 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1702 return 0;
1703}
1704EXPORT_SYMBOL(transport_generic_handle_tmr);
1705
cdbb70bb
CH		 1706/*
1707 * If the task is active, request it to be stopped and sleep until it
1708 * has completed.
1709 */
1710bool target_stop_task(struct se_task *task, unsigned long *flags)
1711{
1712 struct se_cmd *cmd = task->task_se_cmd;
1713 bool was_active = false;
1714
1715 if (task->task_flags & TF_ACTIVE) {
1716 task->task_flags |= TF_REQUEST_STOP;
1717 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1718
1719 pr_debug("Task %p waiting to complete\n", task);
1720 wait_for_completion(&task->task_stop_comp);
1721 pr_debug("Task %p stopped successfully\n", task);
1722
1723 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1724 atomic_dec(&cmd->t_task_cdbs_left);
1725 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1726 was_active = true;
1727 }
1728
cdbb70bb
CH		 1729 return was_active;
1730}
1731
c66ac9db
NB		 1732static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1733{
1734 struct se_task *task, *task_tmp;
1735 unsigned long flags;
1736 int ret = 0;
1737
6708bb27 1738 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1739 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1740
1741 /*
1742 * No tasks remain in the execution queue
1743 */
a1d8b49a 1744 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1745 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1746 &cmd->t_task_list, t_list) {
04629b7b 1747 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1748 /*
1749 * If the struct se_task has not been sent and is not active,
1750 * remove the struct se_task from the execution queue.
1751 */
6c76bf95 1752 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1753 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1754 flags);
1755 transport_remove_task_from_execute_queue(task,
42bf829e 1756 cmd->se_dev);
c66ac9db 1757
04629b7b 1758 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1759 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1760 continue;
1761 }
1762
cdbb70bb 1763 if (!target_stop_task(task, &flags)) {
04629b7b 1764 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1765 ret++;
1766 }
c66ac9db 1767 }
a1d8b49a 1768 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1769
1770 return ret;
1771}
1772
c66ac9db
NB		 1773/*
1774 * Handle SAM-esque emulation for generic transport request failures.
1775 */
03e98c9e 1776static void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1777{
07bde79a
NB		 1778 int ret = 0;
1779
6708bb27 1780 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1781 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1782 cmd->t_task_cdb[0]);
03e98c9e 1783 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1784 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1785 cmd->t_state, cmd->scsi_sense_reason);
6708bb27 1786 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1787 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1788 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1789 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1790 atomic_read(&cmd->t_task_cdbs_left),
1791 atomic_read(&cmd->t_task_cdbs_sent),
1792 atomic_read(&cmd->t_task_cdbs_ex_left),
1793 atomic_read(&cmd->t_transport_active),
1794 atomic_read(&cmd->t_transport_stop),
1795 atomic_read(&cmd->t_transport_sent));
c66ac9db 1796
c66ac9db
NB		 1797 /*
1798 * For SAM Task Attribute emulation for failed struct se_cmd
1799 */
1800 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1801 transport_complete_task_attr(cmd);
1802
03e98c9e
NB		 1803 switch (cmd->scsi_sense_reason) {
1804 case TCM_NON_EXISTENT_LUN:
1805 case TCM_UNSUPPORTED_SCSI_OPCODE:
1806 case TCM_INVALID_CDB_FIELD:
1807 case TCM_INVALID_PARAMETER_LIST:
1808 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1809 case TCM_UNKNOWN_MODE_PAGE:
1810 case TCM_WRITE_PROTECTED:
1811 case TCM_CHECK_CONDITION_ABORT_CMD:
1812 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1813 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1814 break;
03e98c9e 1815 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1816 /*
1817 * No SENSE Data payload for this case, set SCSI Status
1818 * and queue the response to $FABRIC_MOD.
1819 *
1820 * Uses linux/include/scsi/scsi.h SAM status codes defs
1821 */
1822 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1823 /*
1824 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1825 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1826 * CONFLICT STATUS.
1827 *
1828 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1829 */
e3d6f909
AG		 1830 if (cmd->se_sess &&
1831 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1832 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1833 cmd->orig_fe_lun, 0x2C,
1834 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1835
07bde79a 1836 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1837 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1838 goto queue_full;
c66ac9db 1839 goto check_stop;
c66ac9db 1840 default:
6708bb27 1841 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1842 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1843 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1844 break;
1845 }
16ab8e60
NB		 1846 /*
1847 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1848 * make the call to transport_send_check_condition_and_sense()
1849 * directly. Otherwise expect the fabric to make the call to
1850 * transport_send_check_condition_and_sense() after handling
1851 * possible unsoliticied write data payloads.
1852 */
03e98c9e
NB		 1853 ret = transport_send_check_condition_and_sense(cmd,
1854 cmd->scsi_sense_reason, 0);
1855 if (ret == -EAGAIN || ret == -ENOMEM)
1856 goto queue_full;
07bde79a 1857
c66ac9db
NB		 1858check_stop:
1859 transport_lun_remove_cmd(cmd);
6708bb27 1860 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1861 ;
07bde79a
NB		 1862 return;
1863
1864queue_full:
e057f533
CH		 1865 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1866 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1867}
1868
c66ac9db
NB		 1869static inline u32 transport_lba_21(unsigned char *cdb)
1870{
1871 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1872}
1873
1874static inline u32 transport_lba_32(unsigned char *cdb)
1875{
1876 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1877}
1878
1879static inline unsigned long long transport_lba_64(unsigned char *cdb)
1880{
1881 unsigned int __v1, __v2;
1882
1883 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1884 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1885
1886 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1887}
1888
1889/*
1890 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1891 */
1892static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1893{
1894 unsigned int __v1, __v2;
1895
1896 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1897 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1898
1899 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1900}
1901
1902static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1903{
1904 unsigned long flags;
1905
a1d8b49a 1906 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 1907 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 1908 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 1909}
1910
c66ac9db
NB		 1911static inline int transport_tcq_window_closed(struct se_device *dev)
1912{
1913 if (dev->dev_tcq_window_closed++ <
1914 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1915 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1916 } else
1917 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1918
e3d6f909 1919 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 1920 return 0;
1921}
1922
1923/*
1924 * Called from Fabric Module context from transport_execute_tasks()
1925 *
1926 * The return of this function determins if the tasks from struct se_cmd
1927 * get added to the execution queue in transport_execute_tasks(),
1928 * or are added to the delayed or ordered lists here.
1929 */
1930static inline int transport_execute_task_attr(struct se_cmd *cmd)
1931{
5951146d 1932 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1933 return 1;
1934 /*
25985edc 1935 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1936 * to allow the passed struct se_cmd list of tasks to the front of the list.
1937 */
e66ecd50 1938 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
6708bb27 1939 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 1940 " 0x%02x, se_ordered_id: %u\n",
6708bb27 1941 cmd->t_task_cdb[0],
c66ac9db
NB		 1942 cmd->se_ordered_id);
1943 return 1;
e66ecd50 1944 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d 1945 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 1946 smp_mb__after_atomic_inc();
1947
6708bb27 1948 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 1949 " list, se_ordered_id: %u\n",
a1d8b49a 1950 cmd->t_task_cdb[0],
c66ac9db
NB		 1951 cmd->se_ordered_id);
1952 /*
1953 * Add ORDERED command to tail of execution queue if
1954 * no other older commands exist that need to be
1955 * completed first.
1956 */
6708bb27 1957 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 1958 return 1;
1959 } else {
1960 /*
1961 * For SIMPLE and UNTAGGED Task Attribute commands
1962 */
5951146d 1963 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 1964 smp_mb__after_atomic_inc();
1965 }
1966 /*
1967 * Otherwise if one or more outstanding ORDERED task attribute exist,
1968 * add the dormant task(s) built for the passed struct se_cmd to the
1969 * execution queue and become in Active state for this struct se_device.
1970 */
5951146d 1971 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 1972 /*
1973 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 1974 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 1975 */
5951146d 1976 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 1977 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 1978 list_add_tail(&cmd->se_delayed_node,
1979 &cmd->se_dev->delayed_cmd_list);
1980 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 1981
6708bb27 1982 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 1983 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 1984 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 1985 cmd->se_ordered_id);
1986 /*
1987 * Return zero to let transport_execute_tasks() know
1988 * not to add the delayed tasks to the execution list.
1989 */
1990 return 0;
1991 }
1992 /*
1993 * Otherwise, no ORDERED task attributes exist..
1994 */
1995 return 1;
1996}
1997
1998/*
1999 * Called from fabric module context in transport_generic_new_cmd() and
2000 * transport_generic_process_write()
2001 */
2002static int transport_execute_tasks(struct se_cmd *cmd)
2003{
2004 int add_tasks;
2005
58a2801a 2006 if (se_dev_check_online(cmd->se_dev) != 0) {
03e98c9e
NB		 2007 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2008 transport_generic_request_failure(cmd);
db1620a2 2009 return 0;
c66ac9db 2010 }
db1620a2 2011
c66ac9db
NB		 2012 /*
2013 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2014 * has occurred that prevents execution.
c66ac9db 2015 */
6708bb27 2016 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2017 /*
2018 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2019 * attribute for the tasks of the received struct se_cmd CDB
2020 */
2021 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2022 if (!add_tasks)
c66ac9db
NB		 2023 goto execute_tasks;
2024 /*
2025 * This calls transport_add_tasks_from_cmd() to handle
2026 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2027 * (if enabled) in __transport_add_task_to_execute_queue() and
2028 * transport_add_task_check_sam_attr().
2029 */
2030 transport_add_tasks_from_cmd(cmd);
2031 }
2032 /*
2033 * Kick the execution queue for the cmd associated struct se_device
2034 * storage object.
2035 */
2036execute_tasks:
5951146d 2037 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2038 return 0;
2039}
2040
2041/*
2042 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2043 * from struct se_device->execute_task_list and
2044 *
2045 * Called from transport_processing_thread()
2046 */
2047static int __transport_execute_tasks(struct se_device *dev)
2048{
2049 int error;
2050 struct se_cmd *cmd = NULL;
e3d6f909 2051 struct se_task *task = NULL;
c66ac9db
NB		 2052 unsigned long flags;
2053
2054 /*
2055 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2056 * struct se_tasks to the selected transport.
c66ac9db
NB		 2057 */
2058check_depth:
e3d6f909 2059 if (!atomic_read(&dev->depth_left))
c66ac9db 2060 return transport_tcq_window_closed(dev);
c66ac9db 2061
e3d6f909 2062 dev->dev_tcq_window_closed = 0;
c66ac9db 2063
e3d6f909
AG		 2064 spin_lock_irq(&dev->execute_task_lock);
2065 if (list_empty(&dev->execute_task_list)) {
2066 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2067 return 0;
2068 }
e3d6f909
AG		 2069 task = list_first_entry(&dev->execute_task_list,
2070 struct se_task, t_execute_list);
04629b7b 2071 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2072 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2073
2074 atomic_dec(&dev->depth_left);
c66ac9db 2075
e3d6f909 2076 cmd = task->task_se_cmd;
c66ac9db 2077
a1d8b49a 2078 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2079 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2080 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2081
a1d8b49a
AG		 2082 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2083 cmd->t_task_list_num)
415a090a 2084 atomic_set(&cmd->t_transport_sent, 1);
c66ac9db 2085
a1d8b49a 2086 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2087
5bda90c8
CH		 2088 if (cmd->execute_task)
2089 error = cmd->execute_task(task);
2090 else
2091 error = dev->transport->do_task(task);
d29a5b6a 2092 if (error != 0) {
d29a5b6a
CH		 2093 spin_lock_irqsave(&cmd->t_state_lock, flags);
2094 task->task_flags &= ~TF_ACTIVE;
2095 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2096 atomic_set(&cmd->t_transport_sent, 0);
2097 transport_stop_tasks_for_cmd(cmd);
2098 atomic_inc(&dev->depth_left);
03e98c9e 2099 transport_generic_request_failure(cmd);
c66ac9db
NB		 2100 }
2101
2102 goto check_depth;
2103
2104 return 0;
2105}
2106
c66ac9db
NB		 2107static inline u32 transport_get_sectors_6(
2108 unsigned char *cdb,
2109 struct se_cmd *cmd,
2110 int *ret)
2111{
5951146d 2112 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2113
2114 /*
2115 * Assume TYPE_DISK for non struct se_device objects.
2116 * Use 8-bit sector value.
2117 */
2118 if (!dev)
2119 goto type_disk;
2120
2121 /*
2122 * Use 24-bit allocation length for TYPE_TAPE.
2123 */
e3d6f909 2124 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2125 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2126
2127 /*
2128 * Everything else assume TYPE_DISK Sector CDB location.
9b5cd7f3
RD		 2129 * Use 8-bit sector value. SBC-3 says:
2130 *
2131 * A TRANSFER LENGTH field set to zero specifies that 256
2132 * logical blocks shall be written. Any other value
2133 * specifies the number of logical blocks that shall be
2134 * written.
c66ac9db
NB		 2135 */
2136type_disk:
9b5cd7f3 2137 return cdb[4] ? : 256;
c66ac9db
NB		 2138}
2139
2140static inline u32 transport_get_sectors_10(
2141 unsigned char *cdb,
2142 struct se_cmd *cmd,
2143 int *ret)
2144{
5951146d 2145 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2146
2147 /*
2148 * Assume TYPE_DISK for non struct se_device objects.
2149 * Use 16-bit sector value.
2150 */
2151 if (!dev)
2152 goto type_disk;
2153
2154 /*
2155 * XXX_10 is not defined in SSC, throw an exception
2156 */
e3d6f909
AG		 2157 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2158 *ret = -EINVAL;
c66ac9db
NB		 2159 return 0;
2160 }
2161
2162 /*
2163 * Everything else assume TYPE_DISK Sector CDB location.
2164 * Use 16-bit sector value.
2165 */
2166type_disk:
2167 return (u32)(cdb[7] << 8) + cdb[8];
2168}
2169
2170static inline u32 transport_get_sectors_12(
2171 unsigned char *cdb,
2172 struct se_cmd *cmd,
2173 int *ret)
2174{
5951146d 2175 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2176
2177 /*
2178 * Assume TYPE_DISK for non struct se_device objects.
2179 * Use 32-bit sector value.
2180 */
2181 if (!dev)
2182 goto type_disk;
2183
2184 /*
2185 * XXX_12 is not defined in SSC, throw an exception
2186 */
e3d6f909
AG		 2187 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2188 *ret = -EINVAL;
c66ac9db
NB		 2189 return 0;
2190 }
2191
2192 /*
2193 * Everything else assume TYPE_DISK Sector CDB location.
2194 * Use 32-bit sector value.
2195 */
2196type_disk:
2197 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2198}
2199
2200static inline u32 transport_get_sectors_16(
2201 unsigned char *cdb,
2202 struct se_cmd *cmd,
2203 int *ret)
2204{
5951146d 2205 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2206
2207 /*
2208 * Assume TYPE_DISK for non struct se_device objects.
2209 * Use 32-bit sector value.
2210 */
2211 if (!dev)
2212 goto type_disk;
2213
2214 /*
2215 * Use 24-bit allocation length for TYPE_TAPE.
2216 */
e3d6f909 2217 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2218 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2219
2220type_disk:
2221 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2222 (cdb[12] << 8) + cdb[13];
2223}
2224
2225/*
2226 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2227 */
2228static inline u32 transport_get_sectors_32(
2229 unsigned char *cdb,
2230 struct se_cmd *cmd,
2231 int *ret)
2232{
2233 /*
2234 * Assume TYPE_DISK for non struct se_device objects.
2235 * Use 32-bit sector value.
2236 */
2237 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2238 (cdb[30] << 8) + cdb[31];
2239
2240}
2241
2242static inline u32 transport_get_size(
2243 u32 sectors,
2244 unsigned char *cdb,
2245 struct se_cmd *cmd)
2246{
5951146d 2247 struct se_device *dev = cmd->se_dev;
c66ac9db 2248
e3d6f909 2249 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2250 if (cdb[1] & 1) { /* sectors */
e3d6f909 2251 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2252 } else /* bytes */
2253 return sectors;
2254 }
2255#if 0
6708bb27 2256 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2257 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2258 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2259 dev->transport->name);
c66ac9db 2260#endif
e3d6f909 2261 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2262}
2263
c66ac9db
NB		 2264static void transport_xor_callback(struct se_cmd *cmd)
2265{
2266 unsigned char *buf, *addr;
ec98f782 2267 struct scatterlist *sg;
c66ac9db
NB		 2268 unsigned int offset;
2269 int i;
ec98f782 2270 int count;
c66ac9db
NB		 2271 /*
2272 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2273 *
2274 * 1) read the specified logical block(s);
2275 * 2) transfer logical blocks from the data-out buffer;
2276 * 3) XOR the logical blocks transferred from the data-out buffer with
2277 * the logical blocks read, storing the resulting XOR data in a buffer;
2278 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2279 * blocks transferred from the data-out buffer; and
2280 * 5) transfer the resulting XOR data to the data-in buffer.
2281 */
2282 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2283 if (!buf) {
2284 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2285 return;
2286 }
2287 /*
ec98f782 2288 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2289 * into the locally allocated *buf
2290 */
ec98f782
AG		 2291 sg_copy_to_buffer(cmd->t_data_sg,
2292 cmd->t_data_nents,
2293 buf,
2294 cmd->data_length);
2295
c66ac9db
NB		 2296 /*
2297 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2298 * cmd->t_mem_bidi_list
c66ac9db
NB		 2299 */
2300
2301 offset = 0;
ec98f782
AG		 2302 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2303 addr = kmap_atomic(sg_page(sg), KM_USER0);
2304 if (!addr)
c66ac9db
NB		 2305 goto out;
2306
ec98f782
AG		 2307 for (i = 0; i < sg->length; i++)
2308 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2309
ec98f782 2310 offset += sg->length;
c66ac9db
NB		 2311 kunmap_atomic(addr, KM_USER0);
2312 }
ec98f782 2313
c66ac9db
NB		 2314out:
2315 kfree(buf);
2316}
2317
2318/*
2319 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2320 */
2321static int transport_get_sense_data(struct se_cmd *cmd)
2322{
2323 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2324 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2325 struct se_task *task = NULL, *task_tmp;
2326 unsigned long flags;
2327 u32 offset = 0;
2328
e3d6f909
AG		 2329 WARN_ON(!cmd->se_lun);
2330
42bf829e
CH		 2331 if (!dev)
2332 return 0;
2333
a1d8b49a 2334 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2335 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2336 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2337 return 0;
2338 }
2339
2340 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2341 &cmd->t_task_list, t_list) {
ef804a84 2342 if (!(task->task_flags & TF_HAS_SENSE))
c66ac9db
NB		 2343 continue;
2344
e3d6f909 2345 if (!dev->transport->get_sense_buffer) {
6708bb27 2346 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2347 " is NULL\n");
2348 continue;
2349 }
2350
e3d6f909 2351 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2352 if (!sense_buffer) {
04629b7b 2353 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2354 " sense buffer for task with sense\n",
04629b7b 2355 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2356 continue;
2357 }
a1d8b49a 2358 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2359
e3d6f909 2360 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2361 TRANSPORT_SENSE_BUFFER);
2362
5951146d 2363 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2364 TRANSPORT_SENSE_BUFFER);
2365 cmd->scsi_status = task->task_scsi_status;
2366 /* Automatically padded */
2367 cmd->scsi_sense_length =
2368 (TRANSPORT_SENSE_BUFFER + offset);
2369
6708bb27 2370 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2371 " and sense\n",
e3d6f909 2372 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2373 cmd->scsi_status);
2374 return 0;
2375 }
a1d8b49a 2376 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2377
2378 return -1;
2379}
2380
ec98f782
AG		 2381static inline long long transport_dev_end_lba(struct se_device *dev)
2382{
2383 return dev->transport->get_blocks(dev) + 1;
2384}
2385
2386static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2387{
2388 struct se_device *dev = cmd->se_dev;
2389 u32 sectors;
2390
2391 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2392 return 0;
2393
2394 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2395
6708bb27
AG		 2396 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2397 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2398 " transport_dev_end_lba(): %llu\n",
2399 cmd->t_task_lba, sectors,
2400 transport_dev_end_lba(dev));
7abbe7f3 2401 return -EINVAL;
ec98f782
AG		 2402 }
2403
7abbe7f3 2404 return 0;
ec98f782
AG		 2405}
2406
706d5860
NB		 2407static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2408{
2409 /*
2410 * Determine if the received WRITE_SAME is used to for direct
2411 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2412 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2413 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2414 */
2415 int passthrough = (dev->transport->transport_type ==
2416 TRANSPORT_PLUGIN_PHBA_PDEV);
2417
2418 if (!passthrough) {
2419 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2420 pr_err("WRITE_SAME PBDATA and LBDATA"
2421 " bits not supported for Block Discard"
2422 " Emulation\n");
2423 return -ENOSYS;
2424 }
2425 /*
2426 * Currently for the emulated case we only accept
2427 * tpws with the UNMAP=1 bit set.
2428 */
2429 if (!(flags[0] & 0x08)) {
2430 pr_err("WRITE_SAME w/o UNMAP bit not"
2431 " supported for Block Discard Emulation\n");
2432 return -ENOSYS;
2433 }
2434 }
2435
2436 return 0;
2437}
2438
c66ac9db
NB		 2439/* transport_generic_cmd_sequencer():
2440 *
2441 * Generic Command Sequencer that should work for most DAS transport
2442 * drivers.
2443 *
2444 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2445 * RX Thread.
2446 *
2447 * FIXME: Need to support other SCSI OPCODES where as well.
2448 */
2449static int transport_generic_cmd_sequencer(
2450 struct se_cmd *cmd,
2451 unsigned char *cdb)
2452{
5951146d 2453 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2454 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2455 int ret = 0, sector_ret = 0, passthrough;
2456 u32 sectors = 0, size = 0, pr_reg_type = 0;
2457 u16 service_action;
2458 u8 alua_ascq = 0;
2459 /*
2460 * Check for an existing UNIT ATTENTION condition
2461 */
2462 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2463 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2464 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2465 return -EINVAL;
c66ac9db
NB		 2466 }
2467 /*
2468 * Check status of Asymmetric Logical Unit Assignment port
2469 */
e3d6f909 2470 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2471 if (ret != 0) {
c66ac9db 2472 /*
25985edc 2473 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2474 * The ALUA additional sense code qualifier (ASCQ) is determined
2475 * by the ALUA primary or secondary access state..
2476 */
2477 if (ret > 0) {
2478#if 0
6708bb27 2479 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2480 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2481 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2482#endif
2483 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2484 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2485 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2486 return -EINVAL;
c66ac9db
NB		 2487 }
2488 goto out_invalid_cdb_field;
2489 }
2490 /*
2491 * Check status for SPC-3 Persistent Reservations
2492 */
e3d6f909
AG		 2493 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2494 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2495 cmd, cdb, pr_reg_type) != 0) {
2496 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2497 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2498 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2499 return -EBUSY;
2500 }
c66ac9db
NB		 2501 /*
2502 * This means the CDB is allowed for the SCSI Initiator port
2503 * when said port is *NOT* holding the legacy SPC-2 or
2504 * SPC-3 Persistent Reservation.
2505 */
2506 }
2507
5bda90c8
CH		 2508 /*
2509 * If we operate in passthrough mode we skip most CDB emulation and
2510 * instead hand the commands down to the physical SCSI device.
2511 */
2512 passthrough =
2513 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2514
c66ac9db
NB		 2515 switch (cdb[0]) {
2516 case READ_6:
2517 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2518 if (sector_ret)
2519 goto out_unsupported_cdb;
2520 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2521 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2522 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2523 break;
2524 case READ_10:
2525 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2526 if (sector_ret)
2527 goto out_unsupported_cdb;
2528 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2529 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2530 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2531 break;
2532 case READ_12:
2533 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2534 if (sector_ret)
2535 goto out_unsupported_cdb;
2536 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2537 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2538 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2539 break;
2540 case READ_16:
2541 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2542 if (sector_ret)
2543 goto out_unsupported_cdb;
2544 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2545 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2546 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2547 break;
2548 case WRITE_6:
2549 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2550 if (sector_ret)
2551 goto out_unsupported_cdb;
2552 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2553 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2554 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2555 break;
2556 case WRITE_10:
2557 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2558 if (sector_ret)
2559 goto out_unsupported_cdb;
2560 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2561 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2562 if (cdb[1] & 0x8)
2563 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2564 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2565 break;
2566 case WRITE_12:
2567 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2568 if (sector_ret)
2569 goto out_unsupported_cdb;
2570 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2571 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2572 if (cdb[1] & 0x8)
2573 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2574 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2575 break;
2576 case WRITE_16:
2577 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2578 if (sector_ret)
2579 goto out_unsupported_cdb;
2580 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2581 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2582 if (cdb[1] & 0x8)
2583 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2584 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2585 break;
2586 case XDWRITEREAD_10:
2587 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2588 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2589 goto out_invalid_cdb_field;
2590 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2591 if (sector_ret)
2592 goto out_unsupported_cdb;
2593 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2594 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2595 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2596
5bda90c8
CH		 2597 /*
2598 * Do now allow BIDI commands for passthrough mode.
2599 */
2600 if (passthrough)
7c1c6af3 2601 goto out_unsupported_cdb;
5bda90c8 2602
c66ac9db 2603 /*
35e0e757 2604 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2605 */
2606 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2607 if (cdb[1] & 0x8)
2608 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2609 break;
2610 case VARIABLE_LENGTH_CMD:
2611 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2612 switch (service_action) {
2613 case XDWRITEREAD_32:
2614 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2615 if (sector_ret)
2616 goto out_unsupported_cdb;
2617 size = transport_get_size(sectors, cdb, cmd);
2618 /*
2619 * Use WRITE_32 and READ_32 opcodes for the emulated
2620 * XDWRITE_READ_32 logic.
2621 */
a1d8b49a 2622 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2623 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2624
5bda90c8
CH		 2625 /*
2626 * Do now allow BIDI commands for passthrough mode.
2627 */
c66ac9db 2628 if (passthrough)
7c1c6af3 2629 goto out_unsupported_cdb;
5bda90c8 2630
c66ac9db 2631 /*
35e0e757
CH		 2632 * Setup BIDI XOR callback to be run during after I/O
2633 * completion.
c66ac9db
NB		 2634 */
2635 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2636 if (cdb[1] & 0x8)
2637 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2638 break;
2639 case WRITE_SAME_32:
2640 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2641 if (sector_ret)
2642 goto out_unsupported_cdb;
dd3a5ad8 2643
6708bb27 2644 if (sectors)
12850626 2645 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2646 else {
2647 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2648 " supported\n");
2649 goto out_invalid_cdb_field;
2650 }
dd3a5ad8 2651
a1d8b49a 2652 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2653 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2654
706d5860 2655 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2656 goto out_invalid_cdb_field;
5bda90c8
CH		 2657 if (!passthrough)
2658 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2659 break;
2660 default:
6708bb27 2661 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2662 " 0x%04x not supported\n", service_action);
2663 goto out_unsupported_cdb;
2664 }
2665 break;
e434f1f1 2666 case MAINTENANCE_IN:
e3d6f909 2667 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2668 /* MAINTENANCE_IN from SCC-2 */
2669 /*
2670 * Check for emulated MI_REPORT_TARGET_PGS.
2671 */
e76a35d6
CH		 2672 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2673 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2674 cmd->execute_task =
2675 target_emulate_report_target_port_groups;
c66ac9db
NB		 2676 }
2677 size = (cdb[6] << 24) | (cdb[7] << 16) |
2678 (cdb[8] << 8) | cdb[9];
2679 } else {
2680 /* GPCMD_SEND_KEY from multi media commands */
2681 size = (cdb[8] << 8) + cdb[9];
2682 }
05d1c7c0 2683 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2684 break;
2685 case MODE_SELECT:
2686 size = cdb[4];
2687 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2688 break;
2689 case MODE_SELECT_10:
2690 size = (cdb[7] << 8) + cdb[8];
2691 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2692 break;
2693 case MODE_SENSE:
2694 size = cdb[4];
05d1c7c0 2695 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2696 if (!passthrough)
2697 cmd->execute_task = target_emulate_modesense;
c66ac9db
NB		 2698 break;
2699 case MODE_SENSE_10:
5bda90c8
CH		 2700 size = (cdb[7] << 8) + cdb[8];
2701 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2702 if (!passthrough)
2703 cmd->execute_task = target_emulate_modesense;
2704 break;
c66ac9db
NB		 2705 case GPCMD_READ_BUFFER_CAPACITY:
2706 case GPCMD_SEND_OPC:
2707 case LOG_SELECT:
2708 case LOG_SENSE:
2709 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2710 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2711 break;
2712 case READ_BLOCK_LIMITS:
2713 size = READ_BLOCK_LEN;
05d1c7c0 2714 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2715 break;
2716 case GPCMD_GET_CONFIGURATION:
2717 case GPCMD_READ_FORMAT_CAPACITIES:
2718 case GPCMD_READ_DISC_INFO:
2719 case GPCMD_READ_TRACK_RZONE_INFO:
2720 size = (cdb[7] << 8) + cdb[8];
2721 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2722 break;
2723 case PERSISTENT_RESERVE_IN:
617c0e06 2724 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2725 cmd->execute_task = target_scsi3_emulate_pr_in;
617c0e06
CH		 2726 size = (cdb[7] << 8) + cdb[8];
2727 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2728 break;
c66ac9db 2729 case PERSISTENT_RESERVE_OUT:
617c0e06 2730 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2731 cmd->execute_task = target_scsi3_emulate_pr_out;
c66ac9db 2732 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2733 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2734 break;
2735 case GPCMD_MECHANISM_STATUS:
2736 case GPCMD_READ_DVD_STRUCTURE:
2737 size = (cdb[8] << 8) + cdb[9];
2738 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2739 break;
2740 case READ_POSITION:
2741 size = READ_POSITION_LEN;
05d1c7c0 2742 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2743 break;
e434f1f1 2744 case MAINTENANCE_OUT:
e3d6f909 2745 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2746 /* MAINTENANCE_OUT from SCC-2
2747 *
2748 * Check for emulated MO_SET_TARGET_PGS.
2749 */
e76a35d6
CH		 2750 if (cdb[1] == MO_SET_TARGET_PGS &&
2751 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2752 cmd->execute_task =
2753 target_emulate_set_target_port_groups;
c66ac9db
NB		 2754 }
2755
2756 size = (cdb[6] << 24) | (cdb[7] << 16) |
2757 (cdb[8] << 8) | cdb[9];
2758 } else {
2759 /* GPCMD_REPORT_KEY from multi media commands */
2760 size = (cdb[8] << 8) + cdb[9];
2761 }
05d1c7c0 2762 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2763 break;
2764 case INQUIRY:
2765 size = (cdb[3] << 8) + cdb[4];
2766 /*
2767 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2768 * See spc4r17 section 5.3
2769 */
5951146d 2770 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2771 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2772 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2773 if (!passthrough)
2774 cmd->execute_task = target_emulate_inquiry;
c66ac9db
NB		 2775 break;
2776 case READ_BUFFER:
2777 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2778 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2779 break;
2780 case READ_CAPACITY:
2781 size = READ_CAP_LEN;
05d1c7c0 2782 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2783 if (!passthrough)
2784 cmd->execute_task = target_emulate_readcapacity;
c66ac9db
NB		 2785 break;
2786 case READ_MEDIA_SERIAL_NUMBER:
2787 case SECURITY_PROTOCOL_IN:
2788 case SECURITY_PROTOCOL_OUT:
2789 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2790 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2791 break;
2792 case SERVICE_ACTION_IN:
5bda90c8
CH		 2793 switch (cmd->t_task_cdb[1] & 0x1f) {
2794 case SAI_READ_CAPACITY_16:
2795 if (!passthrough)
2796 cmd->execute_task =
2797 target_emulate_readcapacity_16;
2798 break;
2799 default:
2800 if (passthrough)
2801 break;
2802
2803 pr_err("Unsupported SA: 0x%02x\n",
2804 cmd->t_task_cdb[1] & 0x1f);
2805 goto out_unsupported_cdb;
2806 }
2807 /*FALLTHROUGH*/
c66ac9db
NB		 2808 case ACCESS_CONTROL_IN:
2809 case ACCESS_CONTROL_OUT:
2810 case EXTENDED_COPY:
2811 case READ_ATTRIBUTE:
2812 case RECEIVE_COPY_RESULTS:
2813 case WRITE_ATTRIBUTE:
2814 size = (cdb[10] << 24) | (cdb[11] << 16) |
2815 (cdb[12] << 8) | cdb[13];
05d1c7c0 2816 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2817 break;
2818 case RECEIVE_DIAGNOSTIC:
2819 case SEND_DIAGNOSTIC:
2820 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2821 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2822 break;
2823/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2824#if 0
2825 case GPCMD_READ_CD:
2826 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2827 size = (2336 * sectors);
05d1c7c0 2828 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2829 break;
2830#endif
2831 case READ_TOC:
2832 size = cdb[8];
05d1c7c0 2833 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2834 break;
2835 case REQUEST_SENSE:
2836 size = cdb[4];
05d1c7c0 2837 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2838 if (!passthrough)
2839 cmd->execute_task = target_emulate_request_sense;
c66ac9db
NB		 2840 break;
2841 case READ_ELEMENT_STATUS:
2842 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2843 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2844 break;
2845 case WRITE_BUFFER:
2846 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2847 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2848 break;
2849 case RESERVE:
2850 case RESERVE_10:
2851 /*
2852 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2853 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2854 */
2855 if (cdb[0] == RESERVE_10)
2856 size = (cdb[7] << 8) | cdb[8];
2857 else
2858 size = cmd->data_length;
2859
2860 /*
2861 * Setup the legacy emulated handler for SPC-2 and
2862 * >= SPC-3 compatible reservation handling (CRH=1)
2863 * Otherwise, we assume the underlying SCSI logic is
2864 * is running in SPC_PASSTHROUGH, and wants reservations
2865 * emulation disabled.
2866 */
e76a35d6
CH		 2867 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2868 cmd->execute_task = target_scsi2_reservation_reserve;
c66ac9db
NB		 2869 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2870 break;
2871 case RELEASE:
2872 case RELEASE_10:
2873 /*
2874 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2875 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2876 */
2877 if (cdb[0] == RELEASE_10)
2878 size = (cdb[7] << 8) | cdb[8];
2879 else
2880 size = cmd->data_length;
2881
e76a35d6
CH		 2882 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2883 cmd->execute_task = target_scsi2_reservation_release;
c66ac9db
NB		 2884 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2885 break;
2886 case SYNCHRONIZE_CACHE:
2887 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2888 /*
2889 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2890 */
2891 if (cdb[0] == SYNCHRONIZE_CACHE) {
2892 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2893 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2894 } else {
2895 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2896 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2897 }
2898 if (sector_ret)
2899 goto out_unsupported_cdb;
2900
2901 size = transport_get_size(sectors, cdb, cmd);
2902 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2903
5bda90c8 2904 if (passthrough)
c66ac9db 2905 break;
5bda90c8 2906
c66ac9db
NB		 2907 /*
2908 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 2909 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 2910 */
7abbe7f3
NB		 2911 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2912 if (transport_cmd_get_valid_sectors(cmd) < 0)
2913 goto out_invalid_cdb_field;
2914 }
5bda90c8 2915 cmd->execute_task = target_emulate_synchronize_cache;
c66ac9db
NB		 2916 break;
2917 case UNMAP:
2918 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 2919 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2920 if (!passthrough)
2921 cmd->execute_task = target_emulate_unmap;
c66ac9db
NB		 2922 break;
2923 case WRITE_SAME_16:
2924 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2925 if (sector_ret)
2926 goto out_unsupported_cdb;
dd3a5ad8 2927
6708bb27 2928 if (sectors)
12850626 2929 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2930 else {
2931 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2932 goto out_invalid_cdb_field;
2933 }
dd3a5ad8 2934
5db0753b 2935 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 2936 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2937
2938 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2939 goto out_invalid_cdb_field;
5bda90c8
CH		 2940 if (!passthrough)
2941 cmd->execute_task = target_emulate_write_same;
706d5860
NB		 2942 break;
2943 case WRITE_SAME:
2944 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2945 if (sector_ret)
2946 goto out_unsupported_cdb;
2947
2948 if (sectors)
12850626 2949 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 2950 else {
2951 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2952 goto out_invalid_cdb_field;
c66ac9db 2953 }
706d5860
NB		 2954
2955 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 2956 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 2957 /*
2958 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2959 * of byte 1 bit 3 UNMAP instead of original reserved field
2960 */
2961 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2962 goto out_invalid_cdb_field;
5bda90c8
CH		 2963 if (!passthrough)
2964 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2965 break;
2966 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 2967 case ERASE:
c66ac9db
NB		 2968 case REZERO_UNIT:
2969 case SEEK_10:
c66ac9db
NB		 2970 case SPACE:
2971 case START_STOP:
2972 case TEST_UNIT_READY:
2973 case VERIFY:
2974 case WRITE_FILEMARKS:
5bda90c8
CH		 2975 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2976 if (!passthrough)
2977 cmd->execute_task = target_emulate_noop;
2978 break;
2979 case GPCMD_CLOSE_TRACK:
2980 case INITIALIZE_ELEMENT_STATUS:
2981 case GPCMD_LOAD_UNLOAD:
2982 case GPCMD_SET_SPEED:
c66ac9db
NB		 2983 case MOVE_MEDIUM:
2984 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2985 break;
2986 case REPORT_LUNS:
e76a35d6 2987 cmd->execute_task = target_report_luns;
c66ac9db
NB		 2988 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2989 /*
2990 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2991 * See spc4r17 section 5.3
2992 */
5951146d 2993 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2994 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2995 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2996 break;
2997 default:
6708bb27 2998 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 2999 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3000 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3001 goto out_unsupported_cdb;
3002 }
3003
3004 if (size != cmd->data_length) {
6708bb27 3005 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3006 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3007 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3008 cmd->data_length, size, cdb[0]);
3009
3010 cmd->cmd_spdtl = size;
3011
3012 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3013 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3014 " WRITE data\n");
3015 goto out_invalid_cdb_field;
3016 }
3017 /*
3018 * Reject READ_* or WRITE_* with overflow/underflow for
3019 * type SCF_SCSI_DATA_SG_IO_CDB.
3020 */
6708bb27
AG		 3021 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3022 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3023 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3024 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3025 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3026 goto out_invalid_cdb_field;
3027 }
3028
3029 if (size > cmd->data_length) {
3030 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3031 cmd->residual_count = (size - cmd->data_length);
3032 } else {
3033 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3034 cmd->residual_count = (cmd->data_length - size);
3035 }
3036 cmd->data_length = size;
3037 }
3038
5bda90c8
CH		 3039 /* reject any command that we don't have a handler for */
3040 if (!(passthrough || cmd->execute_task ||
3041 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3042 goto out_unsupported_cdb;
3043
d0229ae3
AG		 3044 /* Let's limit control cdbs to a page, for simplicity's sake. */
3045 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3046 size > PAGE_SIZE)
3047 goto out_invalid_cdb_field;
3048
c66ac9db
NB		 3049 transport_set_supported_SAM_opcode(cmd);
3050 return ret;
3051
3052out_unsupported_cdb:
3053 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3054 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3055 return -EINVAL;
c66ac9db
NB		 3056out_invalid_cdb_field:
3057 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3058 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3059 return -EINVAL;
c66ac9db
NB		 3060}
3061
c66ac9db 3062/*
35e0e757 3063 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3064 * and ordered cmds need to have their tasks added to the execution queue.
3065 */
3066static void transport_complete_task_attr(struct se_cmd *cmd)
3067{
5951146d 3068 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3069 struct se_cmd *cmd_p, *cmd_tmp;
3070 int new_active_tasks = 0;
3071
e66ecd50 3072 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3073 atomic_dec(&dev->simple_cmds);
3074 smp_mb__after_atomic_dec();
3075 dev->dev_cur_ordered_id++;
6708bb27 3076 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3077 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3078 cmd->se_ordered_id);
e66ecd50 3079 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3080 dev->dev_cur_ordered_id++;
6708bb27 3081 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3082 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3083 cmd->se_ordered_id);
e66ecd50 3084 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3085 atomic_dec(&dev->dev_ordered_sync);
3086 smp_mb__after_atomic_dec();
c66ac9db
NB		 3087
3088 dev->dev_cur_ordered_id++;
6708bb27 3089 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3090 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3091 }
3092 /*
3093 * Process all commands up to the last received
3094 * ORDERED task attribute which requires another blocking
3095 * boundary
3096 */
3097 spin_lock(&dev->delayed_cmd_lock);
3098 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3099 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3100
5951146d 3101 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3102 spin_unlock(&dev->delayed_cmd_lock);
3103
6708bb27 3104 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3105 " cmd_p: 0x%02x Task Attr: 0x%02x"
3106 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3107 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3108 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3109
3110 transport_add_tasks_from_cmd(cmd_p);
3111 new_active_tasks++;
3112
3113 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3114 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3115 break;
3116 }
3117 spin_unlock(&dev->delayed_cmd_lock);
3118 /*
3119 * If new tasks have become active, wake up the transport thread
3120 * to do the processing of the Active tasks.
3121 */
3122 if (new_active_tasks != 0)
e3d6f909 3123 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3124}
3125
e057f533 3126static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3127{
3128 int ret = 0;
3129
e057f533
CH		 3130 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3131 transport_complete_task_attr(cmd);
3132
3133 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3134 ret = cmd->se_tfo->queue_status(cmd);
3135 if (ret)
3136 goto out;
3137 }
07bde79a
NB		 3138
3139 switch (cmd->data_direction) {
3140 case DMA_FROM_DEVICE:
3141 ret = cmd->se_tfo->queue_data_in(cmd);
3142 break;
3143 case DMA_TO_DEVICE:
ec98f782 3144 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3145 ret = cmd->se_tfo->queue_data_in(cmd);
3146 if (ret < 0)
e057f533 3147 break;
07bde79a
NB		 3148 }
3149 /* Fall through for DMA_TO_DEVICE */
3150 case DMA_NONE:
3151 ret = cmd->se_tfo->queue_status(cmd);
3152 break;
3153 default:
3154 break;
3155 }
3156
e057f533
CH		 3157out:
3158 if (ret < 0) {
3159 transport_handle_queue_full(cmd, cmd->se_dev);
3160 return;
3161 }
3162 transport_lun_remove_cmd(cmd);
3163 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3164}
3165
3166static void transport_handle_queue_full(
3167 struct se_cmd *cmd,
e057f533 3168 struct se_device *dev)
07bde79a
NB		 3169{
3170 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3171 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3172 atomic_inc(&dev->dev_qf_count);
3173 smp_mb__after_atomic_inc();
3174 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3175
3176 schedule_work(&cmd->se_dev->qf_work_queue);
3177}
3178
35e0e757 3179static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3180{
35e0e757 3181 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3182 int reason = 0, ret;
35e0e757 3183
c66ac9db
NB		 3184 /*
3185 * Check if we need to move delayed/dormant tasks from cmds on the
3186 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3187 * Attribute.
3188 */
5951146d 3189 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3190 transport_complete_task_attr(cmd);
07bde79a
NB		 3191 /*
3192 * Check to schedule QUEUE_FULL work, or execute an existing
3193 * cmd->transport_qf_callback()
3194 */
3195 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3196 schedule_work(&cmd->se_dev->qf_work_queue);
3197
c66ac9db
NB		 3198 /*
3199 * Check if we need to retrieve a sense buffer from
3200 * the struct se_cmd in question.
3201 */
3202 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3203 if (transport_get_sense_data(cmd) < 0)
3204 reason = TCM_NON_EXISTENT_LUN;
3205
3206 /*
3207 * Only set when an struct se_task->task_scsi_status returned
3208 * a non GOOD status.
3209 */
3210 if (cmd->scsi_status) {
07bde79a 3211 ret = transport_send_check_condition_and_sense(
c66ac9db 3212 cmd, reason, 1);
f147abb4 3213 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3214 goto queue_full;
3215
c66ac9db
NB		 3216 transport_lun_remove_cmd(cmd);
3217 transport_cmd_check_stop_to_fabric(cmd);
3218 return;
3219 }
3220 }
3221 /*
25985edc 3222 * Check for a callback, used by amongst other things
c66ac9db
NB		 3223 * XDWRITE_READ_10 emulation.
3224 */
3225 if (cmd->transport_complete_callback)
3226 cmd->transport_complete_callback(cmd);
3227
3228 switch (cmd->data_direction) {
3229 case DMA_FROM_DEVICE:
3230 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3231 if (cmd->se_lun->lun_sep) {
3232 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3233 cmd->data_length;
3234 }
3235 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3236
07bde79a 3237 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3238 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3239 goto queue_full;
c66ac9db
NB		 3240 break;
3241 case DMA_TO_DEVICE:
3242 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3243 if (cmd->se_lun->lun_sep) {
3244 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3245 cmd->data_length;
3246 }
3247 spin_unlock(&cmd->se_lun->lun_sep_lock);
3248 /*
3249 * Check if we need to send READ payload for BIDI-COMMAND
3250 */
ec98f782 3251 if (cmd->t_bidi_data_sg) {
c66ac9db 3252 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3253 if (cmd->se_lun->lun_sep) {
3254 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3255 cmd->data_length;
3256 }
3257 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3258 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3259 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3260 goto queue_full;
c66ac9db
NB		 3261 break;
3262 }
3263 /* Fall through for DMA_TO_DEVICE */
3264 case DMA_NONE:
07bde79a 3265 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3266 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3267 goto queue_full;
c66ac9db
NB		 3268 break;
3269 default:
3270 break;
3271 }
3272
3273 transport_lun_remove_cmd(cmd);
3274 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3275 return;
3276
3277queue_full:
6708bb27 3278 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3279 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3280 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3281 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3282}
3283
3284static void transport_free_dev_tasks(struct se_cmd *cmd)
3285{
3286 struct se_task *task, *task_tmp;
3287 unsigned long flags;
0c2cfe5f 3288 LIST_HEAD(dispose_list);
c66ac9db 3289
a1d8b49a 3290 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3291 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3292 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3293 if (!(task->task_flags & TF_ACTIVE))
3294 list_move_tail(&task->t_list, &dispose_list);
3295 }
3296 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3297
3298 while (!list_empty(&dispose_list)) {
3299 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3300
af3f00c7
CH		 3301 if (task->task_sg != cmd->t_data_sg &&
3302 task->task_sg != cmd->t_bidi_data_sg)
3303 kfree(task->task_sg);
c66ac9db
NB		 3304
3305 list_del(&task->t_list);
3306
42bf829e 3307 cmd->se_dev->transport->free_task(task);
c66ac9db 3308 }
c66ac9db
NB		 3309}
3310
6708bb27 3311static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3312{
ec98f782 3313 struct scatterlist *sg;
ec98f782 3314 int count;
c66ac9db 3315
6708bb27
AG		 3316 for_each_sg(sgl, sg, nents, count)
3317 __free_page(sg_page(sg));
c66ac9db 3318
6708bb27
AG		 3319 kfree(sgl);
3320}
c66ac9db 3321
6708bb27
AG		 3322static inline void transport_free_pages(struct se_cmd *cmd)
3323{
3324 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3325 return;
3326
3327 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3328 cmd->t_data_sg = NULL;
3329 cmd->t_data_nents = 0;
c66ac9db 3330
6708bb27 3331 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3332 cmd->t_bidi_data_sg = NULL;
3333 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3334}
3335
e26d99ae
CH		 3336/**
3337 * transport_release_cmd - free a command
3338 * @cmd: command to free
3339 *
3340 * This routine unconditionally frees a command, and reference counting
3341 * or list removal must be done in the caller.
3342 */
3343static void transport_release_cmd(struct se_cmd *cmd)
3344{
3345 BUG_ON(!cmd->se_tfo);
3346
3347 if (cmd->se_tmr_req)
3348 core_tmr_release_req(cmd->se_tmr_req);
3349 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3350 kfree(cmd->t_task_cdb);
3351 /*
3352 * Check if target_wait_for_sess_cmds() is expecting to
3353 * release se_cmd directly here..
3354 */
3355 if (cmd->check_release != 0 && cmd->se_tfo->check_release_cmd)
3356 if (cmd->se_tfo->check_release_cmd(cmd) != 0)
3357 return;
3358
3359 cmd->se_tfo->release_cmd(cmd);
3360}
3361
d3df7825
CH		 3362/**
3363 * transport_put_cmd - release a reference to a command
3364 * @cmd: command to release
3365 *
3366 * This routine releases our reference to the command and frees it if possible.
3367 */
39c05f32 3368static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3369{
3370 unsigned long flags;
4911e3cc 3371 int free_tasks = 0;
c66ac9db 3372
a1d8b49a 3373 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3374 if (atomic_read(&cmd->t_fe_count)) {
3375 if (!atomic_dec_and_test(&cmd->t_fe_count))
3376 goto out_busy;
3377 }
3378
3379 if (atomic_read(&cmd->t_se_count)) {
3380 if (!atomic_dec_and_test(&cmd->t_se_count))
3381 goto out_busy;
3382 }
3383
3384 if (atomic_read(&cmd->transport_dev_active)) {
3385 atomic_set(&cmd->transport_dev_active, 0);
3386 transport_all_task_dev_remove_state(cmd);
3387 free_tasks = 1;
c66ac9db 3388 }
a1d8b49a 3389 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3390
4911e3cc
CH		 3391 if (free_tasks != 0)
3392 transport_free_dev_tasks(cmd);
d3df7825 3393
c66ac9db 3394 transport_free_pages(cmd);
31afc39c 3395 transport_release_cmd(cmd);
39c05f32 3396 return;
4911e3cc
CH		 3397out_busy:
3398 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3399}
3400
c66ac9db 3401/*
ec98f782
AG		 3402 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3403 * allocating in the core.
c66ac9db
NB		 3404 * @cmd: Associated se_cmd descriptor
3405 * @mem: SGL style memory for TCM WRITE / READ
3406 * @sg_mem_num: Number of SGL elements
3407 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3408 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3409 *
3410 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3411 * of parameters.
3412 */
3413int transport_generic_map_mem_to_cmd(
3414 struct se_cmd *cmd,
5951146d
AG		 3415 struct scatterlist *sgl,
3416 u32 sgl_count,
3417 struct scatterlist *sgl_bidi,
3418 u32 sgl_bidi_count)
c66ac9db 3419{
5951146d 3420 if (!sgl || !sgl_count)
c66ac9db 3421 return 0;
c66ac9db 3422
c66ac9db
NB		 3423 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3424 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
fef58a60
NB		 3425 /*
3426 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3427 * scatterlists already have been set to follow what the fabric
3428 * passes for the original expected data transfer length.
3429 */
3430 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3431 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3432 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3433 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3434 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3435 return -EINVAL;
3436 }
c66ac9db 3437
ec98f782
AG		 3438 cmd->t_data_sg = sgl;
3439 cmd->t_data_nents = sgl_count;
c66ac9db 3440
ec98f782
AG		 3441 if (sgl_bidi && sgl_bidi_count) {
3442 cmd->t_bidi_data_sg = sgl_bidi;
3443 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3444 }
3445 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3446 }
3447
3448 return 0;
3449}
3450EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3451
05d1c7c0
AG		 3452void *transport_kmap_first_data_page(struct se_cmd *cmd)
3453{
ec98f782 3454 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3455
ec98f782 3456 BUG_ON(!sg);
05d1c7c0 3457 /*
ec98f782
AG		 3458 * We need to take into account a possible offset here for fabrics like
3459 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3460 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3461 */
ec98f782 3462 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3463}
3464EXPORT_SYMBOL(transport_kmap_first_data_page);
3465
3466void transport_kunmap_first_data_page(struct se_cmd *cmd)
3467{
ec98f782 3468 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3469}
3470EXPORT_SYMBOL(transport_kunmap_first_data_page);
3471
c66ac9db 3472static int
05d1c7c0 3473transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3474{
ec98f782
AG		 3475 u32 length = cmd->data_length;
3476 unsigned int nents;
3477 struct page *page;
3478 int i = 0;
c66ac9db 3479
ec98f782
AG		 3480 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3481 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3482 if (!cmd->t_data_sg)
3483 return -ENOMEM;
c66ac9db 3484
ec98f782
AG		 3485 cmd->t_data_nents = nents;
3486 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3487
ec98f782
AG		 3488 while (length) {
3489 u32 page_len = min_t(u32, length, PAGE_SIZE);
3490 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3491 if (!page)
3492 goto out;
c66ac9db 3493
ec98f782
AG		 3494 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3495 length -= page_len;
3496 i++;
c66ac9db 3497 }
c66ac9db 3498 return 0;
c66ac9db 3499
ec98f782
AG		 3500out:
3501 while (i >= 0) {
3502 __free_page(sg_page(&cmd->t_data_sg[i]));
3503 i--;
c66ac9db 3504 }
ec98f782
AG		 3505 kfree(cmd->t_data_sg);
3506 cmd->t_data_sg = NULL;
3507 return -ENOMEM;
c66ac9db
NB		 3508}
3509
a1d8b49a
AG		 3510/* Reduce sectors if they are too long for the device */
3511static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3512 struct se_device *dev,
3513 unsigned long long lba,
a1d8b49a 3514 sector_t sectors)
c66ac9db 3515{
a1d8b49a 3516 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3517
a1d8b49a
AG		 3518 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3519 if ((lba + sectors) > transport_dev_end_lba(dev))
3520 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3521
a1d8b49a 3522 return sectors;
c66ac9db
NB		 3523}
3524
c66ac9db
NB		 3525
3526/*
3527 * This function can be used by HW target mode drivers to create a linked
3528 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3529 * This is intended to be called during the completion path by TCM Core
3530 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3531 */
3532void transport_do_task_sg_chain(struct se_cmd *cmd)
3533{
ec98f782
AG		 3534 struct scatterlist *sg_first = NULL;
3535 struct scatterlist *sg_prev = NULL;
3536 int sg_prev_nents = 0;
3537 struct scatterlist *sg;
c66ac9db 3538 struct se_task *task;
ec98f782 3539 u32 chained_nents = 0;
c66ac9db
NB		 3540 int i;
3541
ec98f782
AG		 3542 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3543
c66ac9db
NB		 3544 /*
3545 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3546 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3547 */
a1d8b49a 3548 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3549 if (!task->task_sg)
c66ac9db
NB		 3550 continue;
3551
ec98f782
AG		 3552 if (!sg_first) {
3553 sg_first = task->task_sg;
6708bb27 3554 chained_nents = task->task_sg_nents;
97868c89 3555 } else {
ec98f782 3556 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3557 chained_nents += task->task_sg_nents;
97868c89 3558 }
c3c74c7a
NB		 3559 /*
3560 * For the padded tasks, use the extra SGL vector allocated
3561 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3562 * offset into sg_chain() above.
3563 *
3564 * We do not need the padding for the last task (or a single
3565 * task), but in that case we will never use the sg_prev_nents
3566 * value below which would be incorrect.
c3c74c7a 3567 */
04629b7b 3568 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3569 sg_prev = task->task_sg;
c66ac9db
NB		 3570 }
3571 /*
3572 * Setup the starting pointer and total t_tasks_sg_linked_no including
3573 * padding SGs for linking and to mark the end.
3574 */
a1d8b49a 3575 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3576 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3577
6708bb27 3578 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3579 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3580 cmd->t_tasks_sg_chained_no);
c66ac9db 3581
a1d8b49a
AG		 3582 for_each_sg(cmd->t_tasks_sg_chained, sg,
3583 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3584
6708bb27 3585 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3586 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3587 if (sg_is_chain(sg))
6708bb27 3588 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3589 if (sg_is_last(sg))
6708bb27 3590 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3591 }
c66ac9db
NB		 3592}
3593EXPORT_SYMBOL(transport_do_task_sg_chain);
3594
a1d8b49a
AG		 3595/*
3596 * Break up cmd into chunks transport can handle
3597 */
38b40067
CH		 3598static int
3599transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3600 enum dma_data_direction data_direction,
38b40067 3601 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3602{
5951146d 3603 struct se_device *dev = cmd->se_dev;
a3eedc22 3604 int task_count, i;
38b40067
CH		 3605 unsigned long long lba;
3606 sector_t sectors, dev_max_sectors;
3607 u32 sector_size;
3608
3609 if (transport_cmd_get_valid_sectors(cmd) < 0)
3610 return -EINVAL;
3611
3612 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3613 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
a1d8b49a 3614
ec98f782 3615 WARN_ON(cmd->data_length % sector_size);
38b40067
CH		 3616
3617 lba = cmd->t_task_lba;
ec98f782 3618 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27 3619 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
af3f00c7
CH		 3620
3621 /*
3622 * If we need just a single task reuse the SG list in the command
3623 * and avoid a lot of work.
3624 */
3625 if (task_count == 1) {
3626 struct se_task *task;
3627 unsigned long flags;
3628
3629 task = transport_generic_get_task(cmd, data_direction);
3630 if (!task)
3631 return -ENOMEM;
3632
3633 task->task_sg = cmd_sg;
3634 task->task_sg_nents = sgl_nents;
3635
3636 task->task_lba = lba;
3637 task->task_sectors = sectors;
3638 task->task_size = task->task_sectors * sector_size;
3639
3640 spin_lock_irqsave(&cmd->t_state_lock, flags);
3641 list_add_tail(&task->t_list, &cmd->t_task_list);
3642 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3643
3644 return task_count;
3645 }
3646
ec98f782 3647 for (i = 0; i < task_count; i++) {
38b40067 3648 struct se_task *task;
c3c74c7a 3649 unsigned int task_size, task_sg_nents_padded;
38b40067
CH		 3650 struct scatterlist *sg;
3651 unsigned long flags;
ec98f782 3652 int count;
a1d8b49a 3653
c66ac9db 3654 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3655 if (!task)
ec98f782 3656 return -ENOMEM;
c66ac9db 3657
c66ac9db 3658 task->task_lba = lba;
ec98f782
AG		 3659 task->task_sectors = min(sectors, dev_max_sectors);
3660 task->task_size = task->task_sectors * sector_size;
c66ac9db 3661
525a48a2
NB		 3662 /*
3663 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3664 * in order to calculate the number per task SGL entries
3665 */
3666 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3667 /*
ec98f782
AG		 3668 * Check if the fabric module driver is requesting that all
3669 * struct se_task->task_sg[] be chained together.. If so,
3670 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3671 * marking the end of the chained SGL for every task except
3672 * the last one for (task_count > 1) operation, or skipping
3673 * the extra padding for the (task_count == 1) case.
c66ac9db 3674 */
c3c74c7a
NB		 3675 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3676 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3677 } else
3678 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3679
1d20bb61 3680 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3681 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3682 if (!task->task_sg) {
3683 cmd->se_dev->transport->free_task(task);
3684 return -ENOMEM;
3685 }
3686
c3c74c7a 3687 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3688
ec98f782
AG		 3689 task_size = task->task_size;
3690
3691 /* Build new sgl, only up to task_size */
6708bb27 3692 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3693 if (cmd_sg->length > task_size)
3694 break;
3695
3696 *sg = *cmd_sg;
3697 task_size -= cmd_sg->length;
3698 cmd_sg = sg_next(cmd_sg);
c66ac9db 3699 }
c66ac9db 3700
ec98f782
AG		 3701 lba += task->task_sectors;
3702 sectors -= task->task_sectors;
c66ac9db 3703
ec98f782
AG		 3704 spin_lock_irqsave(&cmd->t_state_lock, flags);
3705 list_add_tail(&task->t_list, &cmd->t_task_list);
3706 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3707 }
3708
ec98f782 3709 return task_count;
c66ac9db
NB		 3710}
3711
3712static int
ec98f782 3713transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3714{
c66ac9db 3715 struct se_task *task;
ec98f782 3716 unsigned long flags;
c66ac9db
NB		 3717
3718 task = transport_generic_get_task(cmd, cmd->data_direction);
3719 if (!task)
ec98f782 3720 return -ENOMEM;
c66ac9db 3721
af3f00c7 3722 task->task_sg = cmd->t_data_sg;
c66ac9db 3723 task->task_size = cmd->data_length;
6708bb27 3724 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3725
ec98f782
AG		 3726 spin_lock_irqsave(&cmd->t_state_lock, flags);
3727 list_add_tail(&task->t_list, &cmd->t_task_list);
3728 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3729
6708bb27 3730 /* Success! Return number of tasks allocated */
a3eedc22 3731 return 1;
ec98f782
AG		 3732}
3733
da0f7619
CH		 3734/*
3735 * Allocate any required ressources to execute the command, and either place
3736 * it on the execution queue if possible. For writes we might not have the
3737 * payload yet, thus notify the fabric via a call to ->write_pending instead.
c66ac9db 3738 */
a1d8b49a 3739int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3740{
da0f7619 3741 struct se_device *dev = cmd->se_dev;
9ac54987 3742 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3743 int set_counts = 1;
c66ac9db
NB		 3744 int ret = 0;
3745
3746 /*
3747 * Determine is the TCM fabric module has already allocated physical
3748 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3749 * beforehand.
c66ac9db 3750 */
ec98f782
AG		 3751 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3752 cmd->data_length) {
05d1c7c0 3753 ret = transport_generic_get_mem(cmd);
c66ac9db 3754 if (ret < 0)
03e98c9e 3755 goto out_fail;
c66ac9db 3756 }
da0f7619 3757
1d20bb61 3758 /*
38b40067 3759 * For BIDI command set up the read tasks first.
1d20bb61 3760 */
da0f7619 3761 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3762 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3763 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3764
9ac54987
NB		 3765 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3766 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3767 cmd->t_bidi_data_nents);
3768 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3769 goto out_fail;
3770
3771 atomic_inc(&cmd->t_fe_count);
3772 atomic_inc(&cmd->t_se_count);
3773 set_counts = 0;
3774 }
38b40067
CH		 3775
3776 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3777 task_cdbs = transport_allocate_data_tasks(cmd,
3778 cmd->data_direction, cmd->t_data_sg,
3779 cmd->t_data_nents);
3780 } else {
3781 task_cdbs = transport_allocate_control_task(cmd);
3782 }
3783
410f6702 3784 if (task_cdbs < 0)
da0f7619 3785 goto out_fail;
410f6702
RD		 3786 else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3787 cmd->t_state = TRANSPORT_COMPLETE;
3788 atomic_set(&cmd->t_transport_active, 1);
3789 INIT_WORK(&cmd->work, target_complete_ok_work);
3790 queue_work(target_completion_wq, &cmd->work);
3791 return 0;
3792 }
da0f7619
CH		 3793
3794 if (set_counts) {
3795 atomic_inc(&cmd->t_fe_count);
3796 atomic_inc(&cmd->t_se_count);
3797 }
3798
9ac54987
NB		 3799 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3800 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3801 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3802
c66ac9db 3803 /*
a1d8b49a 3804 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3805 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3806 * will be added to the struct se_device execution queue after its WRITE
3807 * data has arrived. (ie: It gets handled by the transport processing
3808 * thread a second time)
3809 */
3810 if (cmd->data_direction == DMA_TO_DEVICE) {
3811 transport_add_tasks_to_state_queue(cmd);
3812 return transport_generic_write_pending(cmd);
3813 }
3814 /*
3815 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3816 * to the execution queue.
3817 */
3818 transport_execute_tasks(cmd);
3819 return 0;
da0f7619
CH		 3820
3821out_fail:
3822 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3823 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3824 return -EINVAL;
c66ac9db 3825}
a1d8b49a 3826EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3827
3828/* transport_generic_process_write():
3829 *
3830 *
3831 */
3832void transport_generic_process_write(struct se_cmd *cmd)
3833{
c66ac9db
NB		 3834 transport_execute_tasks(cmd);
3835}
3836EXPORT_SYMBOL(transport_generic_process_write);
3837
e057f533 3838static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3839{
f147abb4
NB		 3840 int ret;
3841
3842 ret = cmd->se_tfo->write_pending(cmd);
3843 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3844 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3845 cmd);
3846 transport_handle_queue_full(cmd, cmd->se_dev);
3847 }
07bde79a
NB		 3848}
3849
c66ac9db
NB		 3850static int transport_generic_write_pending(struct se_cmd *cmd)
3851{
3852 unsigned long flags;
3853 int ret;
3854
a1d8b49a 3855 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3856 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3857 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3858
c66ac9db
NB		 3859 /*
3860 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 3861 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 3862 * can be called from HW target mode interrupt code. This is safe
e3d6f909 3863 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3864 * because the se_cmd->se_lun pointer is not being cleared.
3865 */
3866 transport_cmd_check_stop(cmd, 1, 0);
3867
3868 /*
3869 * Call the fabric write_pending function here to let the
3870 * frontend know that WRITE buffers are ready.
3871 */
e3d6f909 3872 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3873 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3874 goto queue_full;
3875 else if (ret < 0)
c66ac9db
NB		 3876 return ret;
3877
03e98c9e 3878 return 1;
07bde79a
NB		 3879
3880queue_full:
6708bb27 3881 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3882 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3883 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3884 return 0;
c66ac9db
NB		 3885}
3886
39c05f32 3887void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3888{
d14921d6
NB		 3889 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3890 if (wait_for_tasks && cmd->se_tmr_req)
3891 transport_wait_for_tasks(cmd);
3892
35462975 3893 transport_release_cmd(cmd);
d14921d6
NB		 3894 } else {
3895 if (wait_for_tasks)
3896 transport_wait_for_tasks(cmd);
3897
c66ac9db
NB		 3898 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3899
82f1c8a4 3900 if (cmd->se_lun)
c66ac9db 3901 transport_lun_remove_cmd(cmd);
c66ac9db 3902
f4366772
NB		 3903 transport_free_dev_tasks(cmd);
3904
39c05f32 3905 transport_put_cmd(cmd);
c66ac9db
NB		 3906 }
3907}
3908EXPORT_SYMBOL(transport_generic_free_cmd);
3909
a17f091d
NB		 3910/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3911 * @se_sess: session to reference
3912 * @se_cmd: command descriptor to add
3913 */
3914void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3915{
3916 unsigned long flags;
3917
3918 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3919 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3920 se_cmd->check_release = 1;
3921 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3922}
3923EXPORT_SYMBOL(target_get_sess_cmd);
3924
3925/* target_put_sess_cmd - Check for active I/O shutdown or list delete
3926 * @se_sess: session to reference
3927 * @se_cmd: command descriptor to drop
3928 */
3929int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3930{
3931 unsigned long flags;
3932
3933 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3934 if (list_empty(&se_cmd->se_cmd_list)) {
3935 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3936 WARN_ON(1);
3937 return 0;
3938 }
3939
3940 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3941 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3942 complete(&se_cmd->cmd_wait_comp);
3943 return 1;
3944 }
3945 list_del(&se_cmd->se_cmd_list);
3946 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3947
3948 return 0;
3949}
3950EXPORT_SYMBOL(target_put_sess_cmd);
3951
3952/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3953 * @se_sess: session to split
3954 */
3955void target_splice_sess_cmd_list(struct se_session *se_sess)
3956{
3957 struct se_cmd *se_cmd;
3958 unsigned long flags;
3959
3960 WARN_ON(!list_empty(&se_sess->sess_wait_list));
3961 INIT_LIST_HEAD(&se_sess->sess_wait_list);
3962
3963 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3964 se_sess->sess_tearing_down = 1;
3965
3966 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3967
3968 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3969 se_cmd->cmd_wait_set = 1;
3970
3971 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3972}
3973EXPORT_SYMBOL(target_splice_sess_cmd_list);
3974
3975/* target_wait_for_sess_cmds - Wait for outstanding descriptors
3976 * @se_sess: session to wait for active I/O
3977 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3978 */
3979void target_wait_for_sess_cmds(
3980 struct se_session *se_sess,
3981 int wait_for_tasks)
3982{
3983 struct se_cmd *se_cmd, *tmp_cmd;
3984 bool rc = false;
3985
3986 list_for_each_entry_safe(se_cmd, tmp_cmd,
3987 &se_sess->sess_wait_list, se_cmd_list) {
3988 list_del(&se_cmd->se_cmd_list);
3989
3990 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3991 " %d\n", se_cmd, se_cmd->t_state,
3992 se_cmd->se_tfo->get_cmd_state(se_cmd));
3993
3994 if (wait_for_tasks) {
3995 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3996 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3997 se_cmd->se_tfo->get_cmd_state(se_cmd));
3998
3999 rc = transport_wait_for_tasks(se_cmd);
4000
4001 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4002 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4003 se_cmd->se_tfo->get_cmd_state(se_cmd));
4004 }
4005
4006 if (!rc) {
4007 wait_for_completion(&se_cmd->cmd_wait_comp);
4008 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4009 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4010 se_cmd->se_tfo->get_cmd_state(se_cmd));
4011 }
4012
4013 se_cmd->se_tfo->release_cmd(se_cmd);
4014 }
4015}
4016EXPORT_SYMBOL(target_wait_for_sess_cmds);
4017
c66ac9db
NB		 4018/* transport_lun_wait_for_tasks():
4019 *
4020 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4021 * an struct se_lun to be successfully shutdown.
4022 */
4023static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4024{
4025 unsigned long flags;
4026 int ret;
4027 /*
4028 * If the frontend has already requested this struct se_cmd to
4029 * be stopped, we can safely ignore this struct se_cmd.
4030 */
a1d8b49a
AG		 4031 spin_lock_irqsave(&cmd->t_state_lock, flags);
4032 if (atomic_read(&cmd->t_transport_stop)) {
4033 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4034 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4035 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4036 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4037 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4038 return -EPERM;
c66ac9db 4039 }
a1d8b49a
AG		 4040 atomic_set(&cmd->transport_lun_fe_stop, 1);
4041 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4042
5951146d 4043 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4044
4045 ret = transport_stop_tasks_for_cmd(cmd);
4046
6708bb27
AG		 4047 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4048 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4049 if (!ret) {
6708bb27 4050 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4051 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4052 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4053 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4054 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4055 }
3df8d40b 4056 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4057
4058 return 0;
4059}
4060
c66ac9db
NB		 4061static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4062{
4063 struct se_cmd *cmd = NULL;
4064 unsigned long lun_flags, cmd_flags;
4065 /*
4066 * Do exception processing and return CHECK_CONDITION status to the
4067 * Initiator Port.
4068 */
4069 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4070 while (!list_empty(&lun->lun_cmd_list)) {
4071 cmd = list_first_entry(&lun->lun_cmd_list,
4072 struct se_cmd, se_lun_node);
4073 list_del(&cmd->se_lun_node);
4074
a1d8b49a 4075 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4076 /*
4077 * This will notify iscsi_target_transport.c:
4078 * transport_cmd_check_stop() that a LUN shutdown is in
4079 * progress for the iscsi_cmd_t.
4080 */
a1d8b49a 4081 spin_lock(&cmd->t_state_lock);
6708bb27 4082 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4083 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4084 cmd->se_lun->unpacked_lun,
4085 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4086 atomic_set(&cmd->transport_lun_stop, 1);
4087 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4088
4089 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4090
6708bb27
AG		 4091 if (!cmd->se_lun) {
4092 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4093 cmd->se_tfo->get_task_tag(cmd),
4094 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4095 BUG();
4096 }
4097 /*
4098 * If the Storage engine still owns the iscsi_cmd_t, determine
4099 * and/or stop its context.
4100 */
6708bb27 4101 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4102 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4103 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4104
e3d6f909 4105 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4106 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4107 continue;
4108 }
4109
6708bb27 4110 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4111 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4112 cmd->se_lun->unpacked_lun,
4113 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4114
a1d8b49a 4115 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4116 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4117 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4118 goto check_cond;
4119 }
a1d8b49a 4120 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4121 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4122 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4123
4124 transport_free_dev_tasks(cmd);
4125 /*
4126 * The Storage engine stopped this struct se_cmd before it was
4127 * send to the fabric frontend for delivery back to the
4128 * Initiator Node. Return this SCSI CDB back with an
4129 * CHECK_CONDITION status.
4130 */
4131check_cond:
4132 transport_send_check_condition_and_sense(cmd,
4133 TCM_NON_EXISTENT_LUN, 0);
4134 /*
4135 * If the fabric frontend is waiting for this iscsi_cmd_t to
4136 * be released, notify the waiting thread now that LU has
4137 * finished accessing it.
4138 */
a1d8b49a
AG		 4139 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4140 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4141 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4142 " struct se_cmd: %p ITT: 0x%08x\n",
4143 lun->unpacked_lun,
e3d6f909 4144 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4145
a1d8b49a 4146 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4147 cmd_flags);
4148 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4149 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4150 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4151 continue;
4152 }
6708bb27 4153 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4154 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4155
a1d8b49a 4156 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4157 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4158 }
4159 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4160}
4161
4162static int transport_clear_lun_thread(void *p)
4163{
8359cf43 4164 struct se_lun *lun = p;
c66ac9db
NB		 4165
4166 __transport_clear_lun_from_sessions(lun);
4167 complete(&lun->lun_shutdown_comp);
4168
4169 return 0;
4170}
4171
4172int transport_clear_lun_from_sessions(struct se_lun *lun)
4173{
4174 struct task_struct *kt;
4175
5951146d 4176 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4177 "tcm_cl_%u", lun->unpacked_lun);
4178 if (IS_ERR(kt)) {
6708bb27 4179 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4180 return PTR_ERR(kt);
c66ac9db
NB		 4181 }
4182 wait_for_completion(&lun->lun_shutdown_comp);
4183
4184 return 0;
4185}
4186
d14921d6
NB		 4187/**
4188 * transport_wait_for_tasks - wait for completion to occur
4189 * @cmd: command to wait
c66ac9db 4190 *
d14921d6
NB		 4191 * Called from frontend fabric context to wait for storage engine
4192 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4193 */
a17f091d 4194bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4195{
4196 unsigned long flags;
4197
a1d8b49a 4198 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4199 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4200 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4201 return false;
d14921d6
NB		 4202 }
4203 /*
4204 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4205 * has been set in transport_set_supported_SAM_opcode().
4206 */
4207 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4208 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4209 return false;
d14921d6 4210 }
c66ac9db
NB		 4211 /*
4212 * If we are already stopped due to an external event (ie: LUN shutdown)
4213 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4214 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4215 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4216 * has completed its operation on the struct se_cmd.
4217 */
a1d8b49a 4218 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4219
6708bb27 4220 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4221 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4222 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4223 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4224 /*
4225 * There is a special case for WRITES where a FE exception +
4226 * LUN shutdown means ConfigFS context is still sleeping on
4227 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4228 * We go ahead and up transport_lun_stop_comp just to be sure
4229 * here.
4230 */
a1d8b49a
AG		 4231 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4232 complete(&cmd->transport_lun_stop_comp);
4233 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4234 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4235
4236 transport_all_task_dev_remove_state(cmd);
4237 /*
4238 * At this point, the frontend who was the originator of this
4239 * struct se_cmd, now owns the structure and can be released through
4240 * normal means below.
4241 */
6708bb27 4242 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4243 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4244 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4245 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4246
a1d8b49a 4247 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4248 }
a1d8b49a 4249 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4250 atomic_read(&cmd->t_transport_aborted)) {
4251 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4252 return false;
d14921d6 4253 }
c66ac9db 4254
a1d8b49a 4255 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4256
6708bb27 4257 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
f2da9dbd
CH		 4258 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4259 cmd, cmd->se_tfo->get_task_tag(cmd),
4260 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4261
a1d8b49a 4262 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4263
5951146d 4264 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4265
a1d8b49a 4266 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4267
a1d8b49a
AG		 4268 spin_lock_irqsave(&cmd->t_state_lock, flags);
4269 atomic_set(&cmd->t_transport_active, 0);
4270 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4271
6708bb27 4272 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4273 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4274 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4275
d14921d6 4276 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4277
4278 return true;
c66ac9db 4279}
d14921d6 4280EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4281
4282static int transport_get_sense_codes(
4283 struct se_cmd *cmd,
4284 u8 *asc,
4285 u8 *ascq)
4286{
4287 *asc = cmd->scsi_asc;
4288 *ascq = cmd->scsi_ascq;
4289
4290 return 0;
4291}
4292
4293static int transport_set_sense_codes(
4294 struct se_cmd *cmd,
4295 u8 asc,
4296 u8 ascq)
4297{
4298 cmd->scsi_asc = asc;
4299 cmd->scsi_ascq = ascq;
4300
4301 return 0;
4302}
4303
4304int transport_send_check_condition_and_sense(
4305 struct se_cmd *cmd,
4306 u8 reason,
4307 int from_transport)
4308{
4309 unsigned char *buffer = cmd->sense_buffer;
4310 unsigned long flags;
4311 int offset;
4312 u8 asc = 0, ascq = 0;
4313
a1d8b49a 4314 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4315 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4316 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4317 return 0;
4318 }
4319 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4320 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4321
4322 if (!reason && from_transport)
4323 goto after_reason;
4324
4325 if (!from_transport)
4326 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4327 /*
4328 * Data Segment and SenseLength of the fabric response PDU.
4329 *
4330 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4331 * from include/scsi/scsi_cmnd.h
4332 */
e3d6f909 4333 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4334 TRANSPORT_SENSE_BUFFER);
4335 /*
4336 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4337 * SENSE KEY values from include/scsi/scsi.h
4338 */
4339 switch (reason) {
4340 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4341 /* CURRENT ERROR */
4342 buffer[offset] = 0x70;
4343 /* ILLEGAL REQUEST */
4344 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4345 /* LOGICAL UNIT NOT SUPPORTED */
4346 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4347 break;
c66ac9db
NB		 4348 case TCM_UNSUPPORTED_SCSI_OPCODE:
4349 case TCM_SECTOR_COUNT_TOO_MANY:
4350 /* CURRENT ERROR */
4351 buffer[offset] = 0x70;
4352 /* ILLEGAL REQUEST */
4353 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4354 /* INVALID COMMAND OPERATION CODE */
4355 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4356 break;
4357 case TCM_UNKNOWN_MODE_PAGE:
4358 /* CURRENT ERROR */
4359 buffer[offset] = 0x70;
4360 /* ILLEGAL REQUEST */
4361 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4362 /* INVALID FIELD IN CDB */
4363 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4364 break;
4365 case TCM_CHECK_CONDITION_ABORT_CMD:
4366 /* CURRENT ERROR */
4367 buffer[offset] = 0x70;
4368 /* ABORTED COMMAND */
4369 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4370 /* BUS DEVICE RESET FUNCTION OCCURRED */
4371 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4372 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4373 break;
4374 case TCM_INCORRECT_AMOUNT_OF_DATA:
4375 /* CURRENT ERROR */
4376 buffer[offset] = 0x70;
4377 /* ABORTED COMMAND */
4378 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4379 /* WRITE ERROR */
4380 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4381 /* NOT ENOUGH UNSOLICITED DATA */
4382 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4383 break;
4384 case TCM_INVALID_CDB_FIELD:
4385 /* CURRENT ERROR */
4386 buffer[offset] = 0x70;
4387 /* ABORTED COMMAND */
4388 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4389 /* INVALID FIELD IN CDB */
4390 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4391 break;
4392 case TCM_INVALID_PARAMETER_LIST:
4393 /* CURRENT ERROR */
4394 buffer[offset] = 0x70;
4395 /* ABORTED COMMAND */
4396 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4397 /* INVALID FIELD IN PARAMETER LIST */
4398 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4399 break;
4400 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4401 /* CURRENT ERROR */
4402 buffer[offset] = 0x70;
4403 /* ABORTED COMMAND */
4404 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4405 /* WRITE ERROR */
4406 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4407 /* UNEXPECTED_UNSOLICITED_DATA */
4408 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4409 break;
4410 case TCM_SERVICE_CRC_ERROR:
4411 /* CURRENT ERROR */
4412 buffer[offset] = 0x70;
4413 /* ABORTED COMMAND */
4414 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4415 /* PROTOCOL SERVICE CRC ERROR */
4416 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4417 /* N/A */
4418 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4419 break;
4420 case TCM_SNACK_REJECTED:
4421 /* CURRENT ERROR */
4422 buffer[offset] = 0x70;
4423 /* ABORTED COMMAND */
4424 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4425 /* READ ERROR */
4426 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4427 /* FAILED RETRANSMISSION REQUEST */
4428 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4429 break;
4430 case TCM_WRITE_PROTECTED:
4431 /* CURRENT ERROR */
4432 buffer[offset] = 0x70;
4433 /* DATA PROTECT */
4434 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4435 /* WRITE PROTECTED */
4436 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4437 break;
4438 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4439 /* CURRENT ERROR */
4440 buffer[offset] = 0x70;
4441 /* UNIT ATTENTION */
4442 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4443 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4444 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4445 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4446 break;
4447 case TCM_CHECK_CONDITION_NOT_READY:
4448 /* CURRENT ERROR */
4449 buffer[offset] = 0x70;
4450 /* Not Ready */
4451 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4452 transport_get_sense_codes(cmd, &asc, &ascq);
4453 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4454 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4455 break;
4456 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4457 default:
4458 /* CURRENT ERROR */
4459 buffer[offset] = 0x70;
4460 /* ILLEGAL REQUEST */
4461 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4462 /* LOGICAL UNIT COMMUNICATION FAILURE */
4463 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4464 break;
4465 }
4466 /*
4467 * This code uses linux/include/scsi/scsi.h SAM status codes!
4468 */
4469 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4470 /*
4471 * Automatically padded, this value is encoded in the fabric's
4472 * data_length response PDU containing the SCSI defined sense data.
4473 */
4474 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4475
4476after_reason:
07bde79a 4477 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4478}
4479EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4480
4481int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4482{
4483 int ret = 0;
4484
a1d8b49a 4485 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4486 if (!send_status ||
c66ac9db
NB		 4487 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4488 return 1;
4489#if 0
6708bb27 4490 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4491 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4492 cmd->t_task_cdb[0],
e3d6f909 4493 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4494#endif
4495 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4496 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4497 ret = 1;
4498 }
4499 return ret;
4500}
4501EXPORT_SYMBOL(transport_check_aborted_status);
4502
4503void transport_send_task_abort(struct se_cmd *cmd)
4504{
c252f003
NB		 4505 unsigned long flags;
4506
4507 spin_lock_irqsave(&cmd->t_state_lock, flags);
4508 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4509 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4510 return;
4511 }
4512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4513
c66ac9db
NB		 4514 /*
4515 * If there are still expected incoming fabric WRITEs, we wait
4516 * until until they have completed before sending a TASK_ABORTED
4517 * response. This response with TASK_ABORTED status will be
4518 * queued back to fabric module by transport_check_aborted_status().
4519 */
4520 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4521 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4522 atomic_inc(&cmd->t_transport_aborted);
c66ac9db 4523 smp_mb__after_atomic_inc();
c66ac9db
NB		 4524 }
4525 }
4526 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4527#if 0
6708bb27 4528 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4529 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4530 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4531#endif
e3d6f909 4532 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4533}
4534
e26d99ae 4535static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4536{
5951146d 4537 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4538 struct se_tmr_req *tmr = cmd->se_tmr_req;
4539 int ret;
4540
4541 switch (tmr->function) {
5c6cd613 4542 case TMR_ABORT_TASK:
c66ac9db
NB		 4543 tmr->response = TMR_FUNCTION_REJECTED;
4544 break;
5c6cd613
NB		 4545 case TMR_ABORT_TASK_SET:
4546 case TMR_CLEAR_ACA:
4547 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4548 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4549 break;
5c6cd613 4550 case TMR_LUN_RESET:
c66ac9db
NB		 4551 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4552 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4553 TMR_FUNCTION_REJECTED;
4554 break;
5c6cd613 4555 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4556 tmr->response = TMR_FUNCTION_REJECTED;
4557 break;
5c6cd613 4558 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4559 tmr->response = TMR_FUNCTION_REJECTED;
4560 break;
c66ac9db 4561 default:
6708bb27 4562 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4563 tmr->function);
4564 tmr->response = TMR_FUNCTION_REJECTED;
4565 break;
4566 }
4567
4568 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4569 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4570
b7b8bef7 4571 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4572 return 0;
4573}
4574
c66ac9db
NB		 4575/* transport_processing_thread():
4576 *
4577 *
4578 */
4579static int transport_processing_thread(void *param)
4580{
5951146d 4581 int ret;
c66ac9db 4582 struct se_cmd *cmd;
8359cf43 4583 struct se_device *dev = param;
c66ac9db 4584
c66ac9db 4585 while (!kthread_should_stop()) {
e3d6f909
AG		 4586 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4587 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4588 kthread_should_stop());
4589 if (ret < 0)
4590 goto out;
4591
c66ac9db
NB		 4592get_cmd:
4593 __transport_execute_tasks(dev);
4594
5951146d
AG		 4595 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4596 if (!cmd)
c66ac9db
NB		 4597 continue;
4598
5951146d 4599 switch (cmd->t_state) {
680b73c5
CH		 4600 case TRANSPORT_NEW_CMD:
4601 BUG();
4602 break;
c66ac9db 4603 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4604 if (!cmd->se_tfo->new_cmd_map) {
4605 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4606 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4607 BUG();
4608 }
e3d6f909 4609 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4610 if (ret < 0) {
03e98c9e 4611 transport_generic_request_failure(cmd);
c66ac9db
NB		 4612 break;
4613 }
c66ac9db 4614 ret = transport_generic_new_cmd(cmd);
f147abb4 4615 if (ret < 0) {
03e98c9e
NB		 4616 transport_generic_request_failure(cmd);
4617 break;
c66ac9db
NB		 4618 }
4619 break;
4620 case TRANSPORT_PROCESS_WRITE:
4621 transport_generic_process_write(cmd);
4622 break;
c66ac9db
NB		 4623 case TRANSPORT_PROCESS_TMR:
4624 transport_generic_do_tmr(cmd);
4625 break;
07bde79a 4626 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4627 transport_write_pending_qf(cmd);
4628 break;
4629 case TRANSPORT_COMPLETE_QF_OK:
4630 transport_complete_qf(cmd);
07bde79a 4631 break;
c66ac9db 4632 default:
f2da9dbd
CH		 4633 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4634 "i_state: %d on SE LUN: %u\n",
4635 cmd->t_state,
e3d6f909
AG		 4636 cmd->se_tfo->get_task_tag(cmd),
4637 cmd->se_tfo->get_cmd_state(cmd),
4638 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4639 BUG();
4640 }
4641
4642 goto get_cmd;
4643 }
4644
4645out:
ce8762f6
NB		 4646 WARN_ON(!list_empty(&dev->state_task_list));
4647 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4648 dev->process_thread = NULL;
4649 return 0;
4650}
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