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target: Correct sense key for INVALID FIELD IN {PARAMETER LIST,CDB}
[linux-2.6-block.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
c66ac9db
NB		 40#include <asm/unaligned.h>
41#include <net/sock.h>
42#include <net/tcp.h>
43#include <scsi/scsi.h>
44#include <scsi/scsi_cmnd.h>
e66ecd50 45#include <scsi/scsi_tcq.h>
c66ac9db
NB		 46
47#include <target/target_core_base.h>
c4795fb2
CH		 48#include <target/target_core_backend.h>
49#include <target/target_core_fabric.h>
c66ac9db
NB		 50#include <target/target_core_configfs.h>
51
e26d99ae 52#include "target_core_internal.h"
c66ac9db 53#include "target_core_alua.h"
c66ac9db 54#include "target_core_pr.h"
c66ac9db
NB		 55#include "target_core_ua.h"
56
e3d6f909 57static int sub_api_initialized;
c66ac9db 58
35e0e757 59static struct workqueue_struct *target_completion_wq;
c66ac9db
NB		 60static struct kmem_cache *se_sess_cache;
61struct kmem_cache *se_tmr_req_cache;
62struct kmem_cache *se_ua_cache;
c66ac9db
NB		 63struct kmem_cache *t10_pr_reg_cache;
64struct kmem_cache *t10_alua_lu_gp_cache;
65struct kmem_cache *t10_alua_lu_gp_mem_cache;
66struct kmem_cache *t10_alua_tg_pt_gp_cache;
67struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
68
c66ac9db 69static int transport_generic_write_pending(struct se_cmd *);
5951146d 70static int transport_processing_thread(void *param);
4d2300cc 71static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
c66ac9db 72static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 73static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 74 struct se_device *dev);
c66ac9db 75static void transport_free_dev_tasks(struct se_cmd *cmd);
05d1c7c0 76static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 77static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 78static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 79static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
03e98c9e 80static void transport_generic_request_failure(struct se_cmd *);
35e0e757 81static void target_complete_ok_work(struct work_struct *work);
c66ac9db 82
e3d6f909 83int init_se_kmem_caches(void)
c66ac9db 84{
c66ac9db
NB		 85 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
86 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
87 0, NULL);
6708bb27
AG		 88 if (!se_tmr_req_cache) {
89 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db 90 " failed\n");
97c34f3b 91 goto out;
c66ac9db
NB		 92 }
93 se_sess_cache = kmem_cache_create("se_sess_cache",
94 sizeof(struct se_session), __alignof__(struct se_session),
95 0, NULL);
6708bb27
AG		 96 if (!se_sess_cache) {
97 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 98 " failed\n");
35e0e757 99 goto out_free_tmr_req_cache;
c66ac9db
NB		 100 }
101 se_ua_cache = kmem_cache_create("se_ua_cache",
102 sizeof(struct se_ua), __alignof__(struct se_ua),
103 0, NULL);
6708bb27
AG		 104 if (!se_ua_cache) {
105 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 106 goto out_free_sess_cache;
c66ac9db 107 }
c66ac9db
NB		 108 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
109 sizeof(struct t10_pr_registration),
110 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 111 if (!t10_pr_reg_cache) {
112 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 113 " failed\n");
35e0e757 114 goto out_free_ua_cache;
c66ac9db
NB		 115 }
116 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
117 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
118 0, NULL);
6708bb27
AG		 119 if (!t10_alua_lu_gp_cache) {
120 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 121 " failed\n");
35e0e757 122 goto out_free_pr_reg_cache;
c66ac9db
NB		 123 }
124 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
125 sizeof(struct t10_alua_lu_gp_member),
126 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 127 if (!t10_alua_lu_gp_mem_cache) {
128 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 129 "cache failed\n");
35e0e757 130 goto out_free_lu_gp_cache;
c66ac9db
NB		 131 }
132 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
133 sizeof(struct t10_alua_tg_pt_gp),
134 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 135 if (!t10_alua_tg_pt_gp_cache) {
136 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 137 "cache failed\n");
35e0e757 138 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 139 }
140 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
141 "t10_alua_tg_pt_gp_mem_cache",
142 sizeof(struct t10_alua_tg_pt_gp_member),
143 __alignof__(struct t10_alua_tg_pt_gp_member),
144 0, NULL);
6708bb27
AG		 145 if (!t10_alua_tg_pt_gp_mem_cache) {
146 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 147 "mem_t failed\n");
35e0e757 148 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 149 }
150
35e0e757
CH		 151 target_completion_wq = alloc_workqueue("target_completion",
152 WQ_MEM_RECLAIM, 0);
153 if (!target_completion_wq)
154 goto out_free_tg_pt_gp_mem_cache;
155
c66ac9db 156 return 0;
35e0e757
CH		 157
158out_free_tg_pt_gp_mem_cache:
159 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
160out_free_tg_pt_gp_cache:
161 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
162out_free_lu_gp_mem_cache:
163 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
164out_free_lu_gp_cache:
165 kmem_cache_destroy(t10_alua_lu_gp_cache);
166out_free_pr_reg_cache:
167 kmem_cache_destroy(t10_pr_reg_cache);
168out_free_ua_cache:
169 kmem_cache_destroy(se_ua_cache);
170out_free_sess_cache:
171 kmem_cache_destroy(se_sess_cache);
172out_free_tmr_req_cache:
173 kmem_cache_destroy(se_tmr_req_cache);
c66ac9db 174out:
e3d6f909 175 return -ENOMEM;
c66ac9db
NB		 176}
177
e3d6f909 178void release_se_kmem_caches(void)
c66ac9db 179{
35e0e757 180 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 181 kmem_cache_destroy(se_tmr_req_cache);
182 kmem_cache_destroy(se_sess_cache);
183 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 184 kmem_cache_destroy(t10_pr_reg_cache);
185 kmem_cache_destroy(t10_alua_lu_gp_cache);
186 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
187 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
188 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 189}
190
e3d6f909
AG		 191/* This code ensures unique mib indexes are handed out. */
192static DEFINE_SPINLOCK(scsi_mib_index_lock);
193static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 194
195/*
196 * Allocate a new row index for the entry type specified
197 */
198u32 scsi_get_new_index(scsi_index_t type)
199{
200 u32 new_index;
201
e3d6f909 202 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 203
e3d6f909
AG		 204 spin_lock(&scsi_mib_index_lock);
205 new_index = ++scsi_mib_index[type];
206 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 207
208 return new_index;
209}
210
e26d99ae 211static void transport_init_queue_obj(struct se_queue_obj *qobj)
c66ac9db
NB		 212{
213 atomic_set(&qobj->queue_cnt, 0);
214 INIT_LIST_HEAD(&qobj->qobj_list);
215 init_waitqueue_head(&qobj->thread_wq);
216 spin_lock_init(&qobj->cmd_queue_lock);
217}
c66ac9db 218
dbc5623e 219void transport_subsystem_check_init(void)
c66ac9db
NB		 220{
221 int ret;
222
dbc5623e
NB		 223 if (sub_api_initialized)
224 return;
225
c66ac9db
NB		 226 ret = request_module("target_core_iblock");
227 if (ret != 0)
6708bb27 228 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 229
230 ret = request_module("target_core_file");
231 if (ret != 0)
6708bb27 232 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 233
234 ret = request_module("target_core_pscsi");
235 if (ret != 0)
6708bb27 236 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 237
238 ret = request_module("target_core_stgt");
239 if (ret != 0)
6708bb27 240 pr_err("Unable to load target_core_stgt\n");
c66ac9db 241
e3d6f909 242 sub_api_initialized = 1;
dbc5623e 243 return;
c66ac9db
NB		 244}
245
246struct se_session *transport_init_session(void)
247{
248 struct se_session *se_sess;
249
250 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 251 if (!se_sess) {
252 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 253 " se_sess_cache\n");
254 return ERR_PTR(-ENOMEM);
255 }
256 INIT_LIST_HEAD(&se_sess->sess_list);
257 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d
NB		 258 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
259 INIT_LIST_HEAD(&se_sess->sess_wait_list);
260 spin_lock_init(&se_sess->sess_cmd_lock);
c66ac9db
NB		 261
262 return se_sess;
263}
264EXPORT_SYMBOL(transport_init_session);
265
266/*
267 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
268 */
269void __transport_register_session(
270 struct se_portal_group *se_tpg,
271 struct se_node_acl *se_nacl,
272 struct se_session *se_sess,
273 void *fabric_sess_ptr)
274{
275 unsigned char buf[PR_REG_ISID_LEN];
276
277 se_sess->se_tpg = se_tpg;
278 se_sess->fabric_sess_ptr = fabric_sess_ptr;
279 /*
280 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
281 *
282 * Only set for struct se_session's that will actually be moving I/O.
283 * eg: *NOT* discovery sessions.
284 */
285 if (se_nacl) {
286 /*
287 * If the fabric module supports an ISID based TransportID,
288 * save this value in binary from the fabric I_T Nexus now.
289 */
e3d6f909 290 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 291 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 292 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 293 &buf[0], PR_REG_ISID_LEN);
294 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
295 }
296 spin_lock_irq(&se_nacl->nacl_sess_lock);
297 /*
298 * The se_nacl->nacl_sess pointer will be set to the
299 * last active I_T Nexus for each struct se_node_acl.
300 */
301 se_nacl->nacl_sess = se_sess;
302
303 list_add_tail(&se_sess->sess_acl_list,
304 &se_nacl->acl_sess_list);
305 spin_unlock_irq(&se_nacl->nacl_sess_lock);
306 }
307 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
308
6708bb27 309 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 310 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 311}
312EXPORT_SYMBOL(__transport_register_session);
313
314void transport_register_session(
315 struct se_portal_group *se_tpg,
316 struct se_node_acl *se_nacl,
317 struct se_session *se_sess,
318 void *fabric_sess_ptr)
319{
320 spin_lock_bh(&se_tpg->session_lock);
321 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
322 spin_unlock_bh(&se_tpg->session_lock);
323}
324EXPORT_SYMBOL(transport_register_session);
325
326void transport_deregister_session_configfs(struct se_session *se_sess)
327{
328 struct se_node_acl *se_nacl;
23388864 329 unsigned long flags;
c66ac9db
NB		 330 /*
331 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
332 */
333 se_nacl = se_sess->se_node_acl;
6708bb27 334 if (se_nacl) {
23388864 335 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 336 list_del(&se_sess->sess_acl_list);
337 /*
338 * If the session list is empty, then clear the pointer.
339 * Otherwise, set the struct se_session pointer from the tail
340 * element of the per struct se_node_acl active session list.
341 */
342 if (list_empty(&se_nacl->acl_sess_list))
343 se_nacl->nacl_sess = NULL;
344 else {
345 se_nacl->nacl_sess = container_of(
346 se_nacl->acl_sess_list.prev,
347 struct se_session, sess_acl_list);
348 }
23388864 349 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 350 }
351}
352EXPORT_SYMBOL(transport_deregister_session_configfs);
353
354void transport_free_session(struct se_session *se_sess)
355{
356 kmem_cache_free(se_sess_cache, se_sess);
357}
358EXPORT_SYMBOL(transport_free_session);
359
360void transport_deregister_session(struct se_session *se_sess)
361{
362 struct se_portal_group *se_tpg = se_sess->se_tpg;
363 struct se_node_acl *se_nacl;
e63a8e19 364 unsigned long flags;
c66ac9db 365
6708bb27 366 if (!se_tpg) {
c66ac9db
NB		 367 transport_free_session(se_sess);
368 return;
369 }
c66ac9db 370
e63a8e19 371 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 372 list_del(&se_sess->sess_list);
373 se_sess->se_tpg = NULL;
374 se_sess->fabric_sess_ptr = NULL;
e63a8e19 375 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 376
377 /*
378 * Determine if we need to do extra work for this initiator node's
379 * struct se_node_acl if it had been previously dynamically generated.
380 */
381 se_nacl = se_sess->se_node_acl;
6708bb27 382 if (se_nacl) {
e63a8e19 383 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 384 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 385 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
386 se_tpg)) {
c66ac9db
NB		 387 list_del(&se_nacl->acl_list);
388 se_tpg->num_node_acls--;
e63a8e19 389 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 390
391 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 392 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 393 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 394 se_nacl);
e63a8e19 395 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 396 }
397 }
e63a8e19 398 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 399 }
400
401 transport_free_session(se_sess);
402
6708bb27 403 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 404 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 405}
406EXPORT_SYMBOL(transport_deregister_session);
407
408/*
a1d8b49a 409 * Called with cmd->t_state_lock held.
c66ac9db
NB		 410 */
411static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
412{
42bf829e 413 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 414 struct se_task *task;
415 unsigned long flags;
416
42bf829e
CH		 417 if (!dev)
418 return;
c66ac9db 419
42bf829e 420 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 421 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 422 continue;
423
c66ac9db 424 spin_lock_irqsave(&dev->execute_task_lock, flags);
1880807a
CH		 425 if (task->t_state_active) {
426 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
427 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db 428
1880807a
CH		 429 list_del(&task->t_state_list);
430 atomic_dec(&cmd->t_task_cdbs_ex_left);
431 task->t_state_active = false;
432 }
433 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db 434 }
1880807a 435
c66ac9db
NB		 436}
437
438/* transport_cmd_check_stop():
439 *
440 * 'transport_off = 1' determines if t_transport_active should be cleared.
441 * 'transport_off = 2' determines if task_dev_state should be removed.
442 *
443 * A non-zero u8 t_state sets cmd->t_state.
444 * Returns 1 when command is stopped, else 0.
445 */
446static int transport_cmd_check_stop(
447 struct se_cmd *cmd,
448 int transport_off,
449 u8 t_state)
450{
451 unsigned long flags;
452
a1d8b49a 453 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 454 /*
455 * Determine if IOCTL context caller in requesting the stopping of this
456 * command for LUN shutdown purposes.
457 */
a1d8b49a 458 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 459 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 460 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 461 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 462
a1d8b49a 463 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 464 if (transport_off == 2)
465 transport_all_task_dev_remove_state(cmd);
a1d8b49a 466 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 467
a1d8b49a 468 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 469 return 1;
470 }
471 /*
472 * Determine if frontend context caller is requesting the stopping of
e3d6f909 473 * this command for frontend exceptions.
c66ac9db 474 */
a1d8b49a 475 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 476 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 477 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 478 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 479
c66ac9db
NB		 480 if (transport_off == 2)
481 transport_all_task_dev_remove_state(cmd);
482
483 /*
484 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
485 * to FE.
486 */
487 if (transport_off == 2)
488 cmd->se_lun = NULL;
a1d8b49a 489 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 490
a1d8b49a 491 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 492 return 1;
493 }
494 if (transport_off) {
a1d8b49a 495 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 496 if (transport_off == 2) {
497 transport_all_task_dev_remove_state(cmd);
498 /*
499 * Clear struct se_cmd->se_lun before the transport_off == 2
500 * handoff to fabric module.
501 */
502 cmd->se_lun = NULL;
503 /*
504 * Some fabric modules like tcm_loop can release
25985edc 505 * their internally allocated I/O reference now and
c66ac9db 506 * struct se_cmd now.
88dd9e26
NB		 507 *
508 * Fabric modules are expected to return '1' here if the
509 * se_cmd being passed is released at this point,
510 * or zero if not being released.
c66ac9db 511 */
e3d6f909 512 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 513 spin_unlock_irqrestore(
a1d8b49a 514 &cmd->t_state_lock, flags);
c66ac9db 515
88dd9e26 516 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 517 }
518 }
a1d8b49a 519 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 520
521 return 0;
522 } else if (t_state)
523 cmd->t_state = t_state;
a1d8b49a 524 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 525
526 return 0;
527}
528
529static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
530{
531 return transport_cmd_check_stop(cmd, 2, 0);
532}
533
534static void transport_lun_remove_cmd(struct se_cmd *cmd)
535{
e3d6f909 536 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 537 unsigned long flags;
538
539 if (!lun)
540 return;
541
a1d8b49a 542 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 543 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 545 goto check_lun;
546 }
a1d8b49a 547 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 548 transport_all_task_dev_remove_state(cmd);
a1d8b49a 549 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 550
c66ac9db
NB		 551
552check_lun:
553 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 554 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 555 list_del(&cmd->se_lun_node);
a1d8b49a 556 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 557#if 0
6708bb27 558 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 559 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 560#endif
561 }
562 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
563}
564
565void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
566{
8dc52b54
NB		 567 if (!cmd->se_tmr_req)
568 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 569
570 if (transport_cmd_check_stop_to_fabric(cmd))
571 return;
77039d1e 572 if (remove) {
3df8d40b 573 transport_remove_cmd_from_queue(cmd);
e6a2573f 574 transport_put_cmd(cmd);
77039d1e 575 }
c66ac9db
NB		 576}
577
f7a5cc0b
CH		 578static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
579 bool at_head)
c66ac9db
NB		 580{
581 struct se_device *dev = cmd->se_dev;
e3d6f909 582 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 583 unsigned long flags;
584
c66ac9db 585 if (t_state) {
a1d8b49a 586 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 587 cmd->t_state = t_state;
a1d8b49a
AG		 588 atomic_set(&cmd->t_transport_active, 1);
589 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 590 }
591
592 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 593
594 /* If the cmd is already on the list, remove it before we add it */
595 if (!list_empty(&cmd->se_queue_node))
596 list_del(&cmd->se_queue_node);
597 else
598 atomic_inc(&qobj->queue_cnt);
599
f7a5cc0b 600 if (at_head)
07bde79a 601 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 602 else
07bde79a 603 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 604 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 605 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
606
c66ac9db 607 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 608}
609
5951146d
AG		 610static struct se_cmd *
611transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 612{
5951146d 613 struct se_cmd *cmd;
c66ac9db
NB		 614 unsigned long flags;
615
616 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
617 if (list_empty(&qobj->qobj_list)) {
618 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
619 return NULL;
620 }
5951146d 621 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 622
79a7fef2 623 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 624
79a7fef2 625 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 626 atomic_dec(&qobj->queue_cnt);
627 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
628
5951146d 629 return cmd;
c66ac9db
NB		 630}
631
3df8d40b 632static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 633{
3df8d40b 634 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 635 unsigned long flags;
636
637 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 638 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 639 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
640 return;
641 }
79a7fef2
RD		 642 atomic_set(&cmd->t_transport_queue_active, 0);
643 atomic_dec(&qobj->queue_cnt);
644 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 645 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
646
a1d8b49a 647 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 648 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 649 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 650 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 651 }
652}
653
654/*
655 * Completion function used by TCM subsystem plugins (such as FILEIO)
656 * for queueing up response from struct se_subsystem_api->do_task()
657 */
658void transport_complete_sync_cache(struct se_cmd *cmd, int good)
659{
a1d8b49a 660 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 661 struct se_task, t_list);
662
663 if (good) {
664 cmd->scsi_status = SAM_STAT_GOOD;
665 task->task_scsi_status = GOOD;
666 } else {
667 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
03e98c9e
NB		 668 task->task_se_cmd->scsi_sense_reason =
669 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
670
c66ac9db
NB		 671 }
672
673 transport_complete_task(task, good);
674}
675EXPORT_SYMBOL(transport_complete_sync_cache);
676
35e0e757
CH		 677static void target_complete_failure_work(struct work_struct *work)
678{
679 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
680
03e98c9e 681 transport_generic_request_failure(cmd);
35e0e757
CH		 682}
683
c66ac9db
NB		 684/* transport_complete_task():
685 *
686 * Called from interrupt and non interrupt context depending
687 * on the transport plugin.
688 */
689void transport_complete_task(struct se_task *task, int success)
690{
e3d6f909 691 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 692 struct se_device *dev = cmd->se_dev;
c66ac9db 693 unsigned long flags;
c66ac9db 694
a1d8b49a 695 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 696 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 697
698 /*
699 * See if any sense data exists, if so set the TASK_SENSE flag.
700 * Also check for any other post completion work that needs to be
701 * done by the plugins.
702 */
703 if (dev && dev->transport->transport_complete) {
704 if (dev->transport->transport_complete(task) != 0) {
705 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
ef804a84 706 task->task_flags |= TF_HAS_SENSE;
c66ac9db
NB		 707 success = 1;
708 }
709 }
710
711 /*
712 * See if we are waiting for outstanding struct se_task
713 * to complete for an exception condition
714 */
6c76bf95 715 if (task->task_flags & TF_REQUEST_STOP) {
a1d8b49a 716 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 717 complete(&task->task_stop_comp);
718 return;
719 }
2235007c
CH		 720
721 if (!success)
722 cmd->t_tasks_failed = 1;
723
c66ac9db
NB		 724 /*
725 * Decrement the outstanding t_task_cdbs_left count. The last
726 * struct se_task from struct se_cmd will complete itself into the
727 * device queue depending upon int success.
728 */
6708bb27 729 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
a1d8b49a 730 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 731 return;
732 }
733
2235007c 734 if (cmd->t_tasks_failed) {
41e16e98 735 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 736 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 737 } else {
a1d8b49a 738 atomic_set(&cmd->t_transport_complete, 1);
35e0e757 739 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 740 }
35e0e757 741
35e0e757
CH		 742 cmd->t_state = TRANSPORT_COMPLETE;
743 atomic_set(&cmd->t_transport_active, 1);
a1d8b49a 744 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 745
35e0e757 746 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 747}
748EXPORT_SYMBOL(transport_complete_task);
749
750/*
751 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
752 * struct se_task list are ready to be added to the active execution list
753 * struct se_device
754
755 * Called with se_dev_t->execute_task_lock called.
756 */
757static inline int transport_add_task_check_sam_attr(
758 struct se_task *task,
759 struct se_task *task_prev,
760 struct se_device *dev)
761{
762 /*
763 * No SAM Task attribute emulation enabled, add to tail of
764 * execution queue
765 */
766 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
767 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
768 return 0;
769 }
770 /*
771 * HEAD_OF_QUEUE attribute for received CDB, which means
772 * the first task that is associated with a struct se_cmd goes to
773 * head of the struct se_device->execute_task_list, and task_prev
774 * after that for each subsequent task
775 */
e66ecd50 776 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 777 list_add(&task->t_execute_list,
778 (task_prev != NULL) ?
779 &task_prev->t_execute_list :
780 &dev->execute_task_list);
781
6708bb27 782 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 783 " in execution queue\n",
6708bb27 784 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 785 return 1;
786 }
787 /*
788 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
789 * transitioned from Dermant -> Active state, and are added to the end
790 * of the struct se_device->execute_task_list
791 */
792 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
793 return 0;
794}
795
796/* __transport_add_task_to_execute_queue():
797 *
798 * Called with se_dev_t->execute_task_lock called.
799 */
800static void __transport_add_task_to_execute_queue(
801 struct se_task *task,
802 struct se_task *task_prev,
803 struct se_device *dev)
804{
805 int head_of_queue;
806
807 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
808 atomic_inc(&dev->execute_tasks);
809
1880807a 810 if (task->t_state_active)
c66ac9db
NB		 811 return;
812 /*
813 * Determine if this task needs to go to HEAD_OF_QUEUE for the
814 * state list as well. Running with SAM Task Attribute emulation
815 * will always return head_of_queue == 0 here
816 */
817 if (head_of_queue)
818 list_add(&task->t_state_list, (task_prev) ?
819 &task_prev->t_state_list :
820 &dev->state_task_list);
821 else
822 list_add_tail(&task->t_state_list, &dev->state_task_list);
823
1880807a 824 task->t_state_active = true;
c66ac9db 825
6708bb27 826 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 827 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 828 task, dev);
829}
830
831static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
832{
42bf829e 833 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 834 struct se_task *task;
835 unsigned long flags;
836
a1d8b49a
AG		 837 spin_lock_irqsave(&cmd->t_state_lock, flags);
838 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db 839 spin_lock(&dev->execute_task_lock);
1880807a
CH		 840 if (!task->t_state_active) {
841 list_add_tail(&task->t_state_list,
842 &dev->state_task_list);
843 task->t_state_active = true;
844
845 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
846 task->task_se_cmd->se_tfo->get_task_tag(
847 task->task_se_cmd), task, dev);
848 }
c66ac9db
NB		 849 spin_unlock(&dev->execute_task_lock);
850 }
a1d8b49a 851 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 852}
853
4d2300cc 854static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
c66ac9db 855{
5951146d 856 struct se_device *dev = cmd->se_dev;
c66ac9db 857 struct se_task *task, *task_prev = NULL;
c66ac9db 858
a1d8b49a 859 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 860 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 861 continue;
862 /*
863 * __transport_add_task_to_execute_queue() handles the
864 * SAM Task Attribute emulation if enabled
865 */
866 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 867 task_prev = task;
868 }
4d2300cc
NB		 869}
870
871static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
872{
873 unsigned long flags;
874 struct se_device *dev = cmd->se_dev;
875
876 spin_lock_irqsave(&dev->execute_task_lock, flags);
877 __transport_add_tasks_from_cmd(cmd);
c66ac9db 878 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 879}
880
04629b7b
CH		 881void __transport_remove_task_from_execute_queue(struct se_task *task,
882 struct se_device *dev)
883{
884 list_del_init(&task->t_execute_list);
885 atomic_dec(&dev->execute_tasks);
886}
887
e26d99ae 888static void transport_remove_task_from_execute_queue(
c66ac9db
NB		 889 struct se_task *task,
890 struct se_device *dev)
891{
892 unsigned long flags;
893
04629b7b 894 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 895 return;
af57c3ac 896
c66ac9db 897 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 898 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 899 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
900}
901
07bde79a 902/*
f147abb4 903 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 904 */
905
906static void target_qf_do_work(struct work_struct *work)
907{
908 struct se_device *dev = container_of(work, struct se_device,
909 qf_work_queue);
bcac364a 910 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 911 struct se_cmd *cmd, *cmd_tmp;
912
913 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 914 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
915 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 916
bcac364a 917 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 918 list_del(&cmd->se_qf_node);
919 atomic_dec(&dev->dev_qf_count);
920 smp_mb__after_atomic_dec();
07bde79a 921
6708bb27 922 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 923 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 924 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 925 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
926 : "UNKNOWN");
f7a5cc0b
CH		 927
928 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 929 }
07bde79a
NB		 930}
931
c66ac9db
NB		 932unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
933{
934 switch (cmd->data_direction) {
935 case DMA_NONE:
936 return "NONE";
937 case DMA_FROM_DEVICE:
938 return "READ";
939 case DMA_TO_DEVICE:
940 return "WRITE";
941 case DMA_BIDIRECTIONAL:
942 return "BIDI";
943 default:
944 break;
945 }
946
947 return "UNKNOWN";
948}
949
950void transport_dump_dev_state(
951 struct se_device *dev,
952 char *b,
953 int *bl)
954{
955 *bl += sprintf(b + *bl, "Status: ");
956 switch (dev->dev_status) {
957 case TRANSPORT_DEVICE_ACTIVATED:
958 *bl += sprintf(b + *bl, "ACTIVATED");
959 break;
960 case TRANSPORT_DEVICE_DEACTIVATED:
961 *bl += sprintf(b + *bl, "DEACTIVATED");
962 break;
963 case TRANSPORT_DEVICE_SHUTDOWN:
964 *bl += sprintf(b + *bl, "SHUTDOWN");
965 break;
966 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
967 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
968 *bl += sprintf(b + *bl, "OFFLINE");
969 break;
970 default:
971 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
972 break;
973 }
974
65586d51
NB		 975 *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d",
976 atomic_read(&dev->execute_tasks), dev->queue_depth);
c66ac9db 977 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 978 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 979 *bl += sprintf(b + *bl, " ");
980}
981
c66ac9db
NB		 982void transport_dump_vpd_proto_id(
983 struct t10_vpd *vpd,
984 unsigned char *p_buf,
985 int p_buf_len)
986{
987 unsigned char buf[VPD_TMP_BUF_SIZE];
988 int len;
989
990 memset(buf, 0, VPD_TMP_BUF_SIZE);
991 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
992
993 switch (vpd->protocol_identifier) {
994 case 0x00:
995 sprintf(buf+len, "Fibre Channel\n");
996 break;
997 case 0x10:
998 sprintf(buf+len, "Parallel SCSI\n");
999 break;
1000 case 0x20:
1001 sprintf(buf+len, "SSA\n");
1002 break;
1003 case 0x30:
1004 sprintf(buf+len, "IEEE 1394\n");
1005 break;
1006 case 0x40:
1007 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1008 " Protocol\n");
1009 break;
1010 case 0x50:
1011 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1012 break;
1013 case 0x60:
1014 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1015 break;
1016 case 0x70:
1017 sprintf(buf+len, "Automation/Drive Interface Transport"
1018 " Protocol\n");
1019 break;
1020 case 0x80:
1021 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1022 break;
1023 default:
1024 sprintf(buf+len, "Unknown 0x%02x\n",
1025 vpd->protocol_identifier);
1026 break;
1027 }
1028
1029 if (p_buf)
1030 strncpy(p_buf, buf, p_buf_len);
1031 else
6708bb27 1032 pr_debug("%s", buf);
c66ac9db
NB		 1033}
1034
1035void
1036transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1037{
1038 /*
1039 * Check if the Protocol Identifier Valid (PIV) bit is set..
1040 *
1041 * from spc3r23.pdf section 7.5.1
1042 */
1043 if (page_83[1] & 0x80) {
1044 vpd->protocol_identifier = (page_83[0] & 0xf0);
1045 vpd->protocol_identifier_set = 1;
1046 transport_dump_vpd_proto_id(vpd, NULL, 0);
1047 }
1048}
1049EXPORT_SYMBOL(transport_set_vpd_proto_id);
1050
1051int transport_dump_vpd_assoc(
1052 struct t10_vpd *vpd,
1053 unsigned char *p_buf,
1054 int p_buf_len)
1055{
1056 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1057 int ret = 0;
1058 int len;
c66ac9db
NB		 1059
1060 memset(buf, 0, VPD_TMP_BUF_SIZE);
1061 len = sprintf(buf, "T10 VPD Identifier Association: ");
1062
1063 switch (vpd->association) {
1064 case 0x00:
1065 sprintf(buf+len, "addressed logical unit\n");
1066 break;
1067 case 0x10:
1068 sprintf(buf+len, "target port\n");
1069 break;
1070 case 0x20:
1071 sprintf(buf+len, "SCSI target device\n");
1072 break;
1073 default:
1074 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1075 ret = -EINVAL;
c66ac9db
NB		 1076 break;
1077 }
1078
1079 if (p_buf)
1080 strncpy(p_buf, buf, p_buf_len);
1081 else
6708bb27 1082 pr_debug("%s", buf);
c66ac9db
NB		 1083
1084 return ret;
1085}
1086
1087int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1088{
1089 /*
1090 * The VPD identification association..
1091 *
1092 * from spc3r23.pdf Section 7.6.3.1 Table 297
1093 */
1094 vpd->association = (page_83[1] & 0x30);
1095 return transport_dump_vpd_assoc(vpd, NULL, 0);
1096}
1097EXPORT_SYMBOL(transport_set_vpd_assoc);
1098
1099int transport_dump_vpd_ident_type(
1100 struct t10_vpd *vpd,
1101 unsigned char *p_buf,
1102 int p_buf_len)
1103{
1104 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1105 int ret = 0;
1106 int len;
c66ac9db
NB		 1107
1108 memset(buf, 0, VPD_TMP_BUF_SIZE);
1109 len = sprintf(buf, "T10 VPD Identifier Type: ");
1110
1111 switch (vpd->device_identifier_type) {
1112 case 0x00:
1113 sprintf(buf+len, "Vendor specific\n");
1114 break;
1115 case 0x01:
1116 sprintf(buf+len, "T10 Vendor ID based\n");
1117 break;
1118 case 0x02:
1119 sprintf(buf+len, "EUI-64 based\n");
1120 break;
1121 case 0x03:
1122 sprintf(buf+len, "NAA\n");
1123 break;
1124 case 0x04:
1125 sprintf(buf+len, "Relative target port identifier\n");
1126 break;
1127 case 0x08:
1128 sprintf(buf+len, "SCSI name string\n");
1129 break;
1130 default:
1131 sprintf(buf+len, "Unsupported: 0x%02x\n",
1132 vpd->device_identifier_type);
e3d6f909 1133 ret = -EINVAL;
c66ac9db
NB		 1134 break;
1135 }
1136
e3d6f909
AG		 1137 if (p_buf) {
1138 if (p_buf_len < strlen(buf)+1)
1139 return -EINVAL;
c66ac9db 1140 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1141 } else {
6708bb27 1142 pr_debug("%s", buf);
e3d6f909 1143 }
c66ac9db
NB		 1144
1145 return ret;
1146}
1147
1148int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1149{
1150 /*
1151 * The VPD identifier type..
1152 *
1153 * from spc3r23.pdf Section 7.6.3.1 Table 298
1154 */
1155 vpd->device_identifier_type = (page_83[1] & 0x0f);
1156 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1157}
1158EXPORT_SYMBOL(transport_set_vpd_ident_type);
1159
1160int transport_dump_vpd_ident(
1161 struct t10_vpd *vpd,
1162 unsigned char *p_buf,
1163 int p_buf_len)
1164{
1165 unsigned char buf[VPD_TMP_BUF_SIZE];
1166 int ret = 0;
1167
1168 memset(buf, 0, VPD_TMP_BUF_SIZE);
1169
1170 switch (vpd->device_identifier_code_set) {
1171 case 0x01: /* Binary */
1172 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1173 &vpd->device_identifier[0]);
1174 break;
1175 case 0x02: /* ASCII */
1176 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1177 &vpd->device_identifier[0]);
1178 break;
1179 case 0x03: /* UTF-8 */
1180 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1181 &vpd->device_identifier[0]);
1182 break;
1183 default:
1184 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1185 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1186 ret = -EINVAL;
c66ac9db
NB		 1187 break;
1188 }
1189
1190 if (p_buf)
1191 strncpy(p_buf, buf, p_buf_len);
1192 else
6708bb27 1193 pr_debug("%s", buf);
c66ac9db
NB		 1194
1195 return ret;
1196}
1197
1198int
1199transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1200{
1201 static const char hex_str[] = "0123456789abcdef";
1202 int j = 0, i = 4; /* offset to start of the identifer */
1203
1204 /*
1205 * The VPD Code Set (encoding)
1206 *
1207 * from spc3r23.pdf Section 7.6.3.1 Table 296
1208 */
1209 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1210 switch (vpd->device_identifier_code_set) {
1211 case 0x01: /* Binary */
1212 vpd->device_identifier[j++] =
1213 hex_str[vpd->device_identifier_type];
1214 while (i < (4 + page_83[3])) {
1215 vpd->device_identifier[j++] =
1216 hex_str[(page_83[i] & 0xf0) >> 4];
1217 vpd->device_identifier[j++] =
1218 hex_str[page_83[i] & 0x0f];
1219 i++;
1220 }
1221 break;
1222 case 0x02: /* ASCII */
1223 case 0x03: /* UTF-8 */
1224 while (i < (4 + page_83[3]))
1225 vpd->device_identifier[j++] = page_83[i++];
1226 break;
1227 default:
1228 break;
1229 }
1230
1231 return transport_dump_vpd_ident(vpd, NULL, 0);
1232}
1233EXPORT_SYMBOL(transport_set_vpd_ident);
1234
1235static void core_setup_task_attr_emulation(struct se_device *dev)
1236{
1237 /*
1238 * If this device is from Target_Core_Mod/pSCSI, disable the
1239 * SAM Task Attribute emulation.
1240 *
1241 * This is currently not available in upsream Linux/SCSI Target
1242 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1243 */
e3d6f909 1244 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1245 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1246 return;
1247 }
1248
1249 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1250 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1251 " device\n", dev->transport->name,
1252 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1253}
1254
1255static void scsi_dump_inquiry(struct se_device *dev)
1256{
e3d6f909 1257 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
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 atomic_set(&dev->dev_ordered_id, 0);
1332
1333 se_dev_set_default_attribs(dev, dev_limits);
1334
1335 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1336 dev->creation_time = get_jiffies_64();
1337 spin_lock_init(&dev->stats_lock);
1338
1339 spin_lock(&hba->device_lock);
1340 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1341 hba->dev_count++;
1342 spin_unlock(&hba->device_lock);
1343 /*
1344 * Setup the SAM Task Attribute emulation for struct se_device
1345 */
1346 core_setup_task_attr_emulation(dev);
1347 /*
1348 * Force PR and ALUA passthrough emulation with internal object use.
1349 */
1350 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1351 /*
1352 * Setup the Reservations infrastructure for struct se_device
1353 */
1354 core_setup_reservations(dev, force_pt);
1355 /*
1356 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1357 */
1358 if (core_setup_alua(dev, force_pt) < 0)
1359 goto out;
1360
1361 /*
1362 * Startup the struct se_device processing thread
1363 */
1364 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1365 "LIO_%s", dev->transport->name);
c66ac9db 1366 if (IS_ERR(dev->process_thread)) {
6708bb27 1367 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1368 dev->transport->name);
c66ac9db
NB		 1369 goto out;
1370 }
07bde79a
NB		 1371 /*
1372 * Setup work_queue for QUEUE_FULL
1373 */
1374 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1375 /*
1376 * Preload the initial INQUIRY const values if we are doing
1377 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1378 * passthrough because this is being provided by the backend LLD.
1379 * This is required so that transport_get_inquiry() copies these
1380 * originals once back into DEV_T10_WWN(dev) for the virtual device
1381 * setup.
1382 */
e3d6f909 1383 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1384 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1385 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1386 " INQUIRY consts\n");
1387 goto out;
1388 }
1389
e3d6f909
AG		 1390 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1391 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1392 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1393 }
1394 scsi_dump_inquiry(dev);
1395
12a18bdc 1396 return dev;
c66ac9db 1397out:
c66ac9db
NB		 1398 kthread_stop(dev->process_thread);
1399
1400 spin_lock(&hba->device_lock);
1401 list_del(&dev->dev_list);
1402 hba->dev_count--;
1403 spin_unlock(&hba->device_lock);
1404
1405 se_release_vpd_for_dev(dev);
1406
c66ac9db
NB		 1407 kfree(dev);
1408
1409 return NULL;
1410}
1411EXPORT_SYMBOL(transport_add_device_to_core_hba);
1412
1413/* transport_generic_prepare_cdb():
1414 *
1415 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1416 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1417 * The point of this is since we are mapping iSCSI LUNs to
1418 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1419 * devices and HBAs for a loop.
1420 */
1421static inline void transport_generic_prepare_cdb(
1422 unsigned char *cdb)
1423{
1424 switch (cdb[0]) {
1425 case READ_10: /* SBC - RDProtect */
1426 case READ_12: /* SBC - RDProtect */
1427 case READ_16: /* SBC - RDProtect */
1428 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1429 case VERIFY: /* SBC - VRProtect */
1430 case VERIFY_16: /* SBC - VRProtect */
1431 case WRITE_VERIFY: /* SBC - VRProtect */
1432 case WRITE_VERIFY_12: /* SBC - VRProtect */
1433 break;
1434 default:
1435 cdb[1] &= 0x1f; /* clear logical unit number */
1436 break;
1437 }
1438}
1439
1440static struct se_task *
1441transport_generic_get_task(struct se_cmd *cmd,
1442 enum dma_data_direction data_direction)
1443{
1444 struct se_task *task;
5951146d 1445 struct se_device *dev = cmd->se_dev;
c66ac9db 1446
6708bb27 1447 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1448 if (!task) {
6708bb27 1449 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1450 return NULL;
1451 }
1452
1453 INIT_LIST_HEAD(&task->t_list);
1454 INIT_LIST_HEAD(&task->t_execute_list);
1455 INIT_LIST_HEAD(&task->t_state_list);
1456 init_completion(&task->task_stop_comp);
c66ac9db 1457 task->task_se_cmd = cmd;
c66ac9db
NB		 1458 task->task_data_direction = data_direction;
1459
c66ac9db
NB		 1460 return task;
1461}
1462
1463static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1464
c66ac9db
NB		 1465/*
1466 * Used by fabric modules containing a local struct se_cmd within their
1467 * fabric dependent per I/O descriptor.
1468 */
1469void transport_init_se_cmd(
1470 struct se_cmd *cmd,
1471 struct target_core_fabric_ops *tfo,
1472 struct se_session *se_sess,
1473 u32 data_length,
1474 int data_direction,
1475 int task_attr,
1476 unsigned char *sense_buffer)
1477{
5951146d
AG		 1478 INIT_LIST_HEAD(&cmd->se_lun_node);
1479 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1480 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1481 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1482 INIT_LIST_HEAD(&cmd->se_cmd_list);
a1d8b49a
AG		 1483 INIT_LIST_HEAD(&cmd->t_task_list);
1484 init_completion(&cmd->transport_lun_fe_stop_comp);
1485 init_completion(&cmd->transport_lun_stop_comp);
1486 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1487 init_completion(&cmd->cmd_wait_comp);
a1d8b49a
AG		 1488 spin_lock_init(&cmd->t_state_lock);
1489 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1490
1491 cmd->se_tfo = tfo;
1492 cmd->se_sess = se_sess;
1493 cmd->data_length = data_length;
1494 cmd->data_direction = data_direction;
1495 cmd->sam_task_attr = task_attr;
1496 cmd->sense_buffer = sense_buffer;
1497}
1498EXPORT_SYMBOL(transport_init_se_cmd);
1499
1500static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1501{
1502 /*
1503 * Check if SAM Task Attribute emulation is enabled for this
1504 * struct se_device storage object
1505 */
5951146d 1506 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1507 return 0;
1508
e66ecd50 1509 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1510 pr_debug("SAM Task Attribute ACA"
c66ac9db 1511 " emulation is not supported\n");
e3d6f909 1512 return -EINVAL;
c66ac9db
NB		 1513 }
1514 /*
1515 * Used to determine when ORDERED commands should go from
1516 * Dormant to Active status.
1517 */
5951146d 1518 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1519 smp_mb__after_atomic_inc();
6708bb27 1520 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1521 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1522 cmd->se_dev->transport->name);
c66ac9db
NB		 1523 return 0;
1524}
1525
c66ac9db
NB		 1526/* transport_generic_allocate_tasks():
1527 *
1528 * Called from fabric RX Thread.
1529 */
1530int transport_generic_allocate_tasks(
1531 struct se_cmd *cmd,
1532 unsigned char *cdb)
1533{
1534 int ret;
1535
1536 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1537 /*
1538 * Ensure that the received CDB is less than the max (252 + 8) bytes
1539 * for VARIABLE_LENGTH_CMD
1540 */
1541 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1542 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1543 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1544 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1545 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1546 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1547 return -EINVAL;
c66ac9db
NB		 1548 }
1549 /*
1550 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1551 * allocate the additional extended CDB buffer now.. Otherwise
1552 * setup the pointer from __t_task_cdb to t_task_cdb.
1553 */
a1d8b49a
AG		 1554 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1555 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1556 GFP_KERNEL);
6708bb27
AG		 1557 if (!cmd->t_task_cdb) {
1558 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1559 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1560 scsi_command_size(cdb),
a1d8b49a 1561 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1562 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1563 cmd->scsi_sense_reason =
1564 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1565 return -ENOMEM;
c66ac9db
NB		 1566 }
1567 } else
a1d8b49a 1568 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1569 /*
a1d8b49a 1570 * Copy the original CDB into cmd->
c66ac9db 1571 */
a1d8b49a 1572 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1573 /*
1574 * Setup the received CDB based on SCSI defined opcodes and
1575 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1576 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1577 * pointer is expected to be setup before we reach this point.
1578 */
1579 ret = transport_generic_cmd_sequencer(cmd, cdb);
1580 if (ret < 0)
1581 return ret;
1582 /*
1583 * Check for SAM Task Attribute Emulation
1584 */
1585 if (transport_check_alloc_task_attr(cmd) < 0) {
1586 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1587 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1588 return -EINVAL;
c66ac9db
NB		 1589 }
1590 spin_lock(&cmd->se_lun->lun_sep_lock);
1591 if (cmd->se_lun->lun_sep)
1592 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1593 spin_unlock(&cmd->se_lun->lun_sep_lock);
1594 return 0;
1595}
1596EXPORT_SYMBOL(transport_generic_allocate_tasks);
1597
695434e1
NB		 1598/*
1599 * Used by fabric module frontends to queue tasks directly.
1600 * Many only be used from process context only
1601 */
1602int transport_handle_cdb_direct(
1603 struct se_cmd *cmd)
1604{
dd8ae59d
NB		 1605 int ret;
1606
695434e1
NB		 1607 if (!cmd->se_lun) {
1608 dump_stack();
6708bb27 1609 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1610 return -EINVAL;
1611 }
1612 if (in_interrupt()) {
1613 dump_stack();
6708bb27 1614 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1615 " from interrupt context\n");
1616 return -EINVAL;
1617 }
dd8ae59d
NB		 1618 /*
1619 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1620 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1621 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1622 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1623 *
1624 * Also, we don't take cmd->t_state_lock here as we only expect
1625 * this to be called for initial descriptor submission.
1626 */
1627 cmd->t_state = TRANSPORT_NEW_CMD;
1628 atomic_set(&cmd->t_transport_active, 1);
1629 /*
1630 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1631 * so follow TRANSPORT_NEW_CMD processing thread context usage
1632 * and call transport_generic_request_failure() if necessary..
1633 */
1634 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1635 if (ret < 0)
1636 transport_generic_request_failure(cmd);
1637
dd8ae59d 1638 return 0;
695434e1
NB		 1639}
1640EXPORT_SYMBOL(transport_handle_cdb_direct);
1641
a6360785
NB		 1642/**
1643 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1644 *
1645 * @se_cmd: command descriptor to submit
1646 * @se_sess: associated se_sess for endpoint
1647 * @cdb: pointer to SCSI CDB
1648 * @sense: pointer to SCSI sense buffer
1649 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1650 * @data_length: fabric expected data transfer length
1651 * @task_addr: SAM task attribute
1652 * @data_dir: DMA data direction
1653 * @flags: flags for command submission from target_sc_flags_tables
1654 *
1655 * This may only be called from process context, and also currently
1656 * assumes internal allocation of fabric payload buffer by target-core.
1657 **/
1658int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1659 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1660 u32 data_length, int task_attr, int data_dir, int flags)
1661{
1662 struct se_portal_group *se_tpg;
1663 int rc;
1664
1665 se_tpg = se_sess->se_tpg;
1666 BUG_ON(!se_tpg);
1667 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1668 BUG_ON(in_interrupt());
1669 /*
1670 * Initialize se_cmd for target operation. From this point
1671 * exceptions are handled by sending exception status via
1672 * target_core_fabric_ops->queue_status() callback
1673 */
1674 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1675 data_length, data_dir, task_attr, sense);
1676 /*
1677 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1678 * se_sess->sess_cmd_list. A second kref_get here is necessary
1679 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1680 * kref_put() to happen during fabric packet acknowledgement.
1681 */
1682 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1683 /*
1684 * Signal bidirectional data payloads to target-core
1685 */
1686 if (flags & TARGET_SCF_BIDI_OP)
1687 se_cmd->se_cmd_flags |= SCF_BIDI;
1688 /*
1689 * Locate se_lun pointer and attach it to struct se_cmd
1690 */
1691 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0)
1692 goto out_check_cond;
1693 /*
1694 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1695 * allocate the necessary tasks to complete the received CDB+data
1696 */
1697 rc = transport_generic_allocate_tasks(se_cmd, cdb);
1698 if (rc != 0)
1699 goto out_check_cond;
1700 /*
1701 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1702 * for immediate execution of READs, otherwise wait for
1703 * transport_generic_handle_data() to be called for WRITEs
1704 * when fabric has filled the incoming buffer.
1705 */
1706 transport_handle_cdb_direct(se_cmd);
1707 return 0;
1708
1709out_check_cond:
1710 transport_send_check_condition_and_sense(se_cmd,
1711 se_cmd->scsi_sense_reason, 0);
1712 return 0;
1713}
1714EXPORT_SYMBOL(target_submit_cmd);
1715
c66ac9db
NB		 1716/*
1717 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1718 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1719 * complete setup in TCM process context w/ TFO->new_cmd_map().
1720 */
1721int transport_generic_handle_cdb_map(
1722 struct se_cmd *cmd)
1723{
e3d6f909 1724 if (!cmd->se_lun) {
c66ac9db 1725 dump_stack();
6708bb27 1726 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1727 return -EINVAL;
c66ac9db
NB		 1728 }
1729
f7a5cc0b 1730 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1731 return 0;
1732}
1733EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1734
1735/* transport_generic_handle_data():
1736 *
1737 *
1738 */
1739int transport_generic_handle_data(
1740 struct se_cmd *cmd)
1741{
1742 /*
1743 * For the software fabric case, then we assume the nexus is being
1744 * failed/shutdown when signals are pending from the kthread context
1745 * caller, so we return a failure. For the HW target mode case running
1746 * in interrupt code, the signal_pending() check is skipped.
1747 */
1748 if (!in_interrupt() && signal_pending(current))
e3d6f909 1749 return -EPERM;
c66ac9db
NB		 1750 /*
1751 * If the received CDB has aleady been ABORTED by the generic
1752 * target engine, we now call transport_check_aborted_status()
1753 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1754 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1755 * sequences at this point.
1756 */
1757 if (transport_check_aborted_status(cmd, 1) != 0)
1758 return 0;
1759
f7a5cc0b 1760 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1761 return 0;
1762}
1763EXPORT_SYMBOL(transport_generic_handle_data);
1764
1765/* transport_generic_handle_tmr():
1766 *
1767 *
1768 */
1769int transport_generic_handle_tmr(
1770 struct se_cmd *cmd)
1771{
f7a5cc0b 1772 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1773 return 0;
1774}
1775EXPORT_SYMBOL(transport_generic_handle_tmr);
1776
cdbb70bb
CH		 1777/*
1778 * If the task is active, request it to be stopped and sleep until it
1779 * has completed.
1780 */
1781bool target_stop_task(struct se_task *task, unsigned long *flags)
1782{
1783 struct se_cmd *cmd = task->task_se_cmd;
1784 bool was_active = false;
1785
1786 if (task->task_flags & TF_ACTIVE) {
1787 task->task_flags |= TF_REQUEST_STOP;
1788 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1789
1790 pr_debug("Task %p waiting to complete\n", task);
1791 wait_for_completion(&task->task_stop_comp);
1792 pr_debug("Task %p stopped successfully\n", task);
1793
1794 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1795 atomic_dec(&cmd->t_task_cdbs_left);
1796 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1797 was_active = true;
1798 }
1799
cdbb70bb
CH		 1800 return was_active;
1801}
1802
c66ac9db
NB		 1803static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1804{
1805 struct se_task *task, *task_tmp;
1806 unsigned long flags;
1807 int ret = 0;
1808
6708bb27 1809 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1810 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1811
1812 /*
1813 * No tasks remain in the execution queue
1814 */
a1d8b49a 1815 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1816 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1817 &cmd->t_task_list, t_list) {
04629b7b 1818 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1819 /*
1820 * If the struct se_task has not been sent and is not active,
1821 * remove the struct se_task from the execution queue.
1822 */
6c76bf95 1823 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1824 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1825 flags);
1826 transport_remove_task_from_execute_queue(task,
42bf829e 1827 cmd->se_dev);
c66ac9db 1828
04629b7b 1829 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1830 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1831 continue;
1832 }
1833
cdbb70bb 1834 if (!target_stop_task(task, &flags)) {
04629b7b 1835 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1836 ret++;
1837 }
c66ac9db 1838 }
a1d8b49a 1839 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1840
1841 return ret;
1842}
1843
c66ac9db
NB		 1844/*
1845 * Handle SAM-esque emulation for generic transport request failures.
1846 */
03e98c9e 1847static void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1848{
07bde79a
NB		 1849 int ret = 0;
1850
6708bb27 1851 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1852 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1853 cmd->t_task_cdb[0]);
03e98c9e 1854 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1855 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1856 cmd->t_state, cmd->scsi_sense_reason);
6708bb27 1857 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1858 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1859 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1860 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1861 atomic_read(&cmd->t_task_cdbs_left),
1862 atomic_read(&cmd->t_task_cdbs_sent),
1863 atomic_read(&cmd->t_task_cdbs_ex_left),
1864 atomic_read(&cmd->t_transport_active),
1865 atomic_read(&cmd->t_transport_stop),
1866 atomic_read(&cmd->t_transport_sent));
c66ac9db 1867
c66ac9db
NB		 1868 /*
1869 * For SAM Task Attribute emulation for failed struct se_cmd
1870 */
1871 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1872 transport_complete_task_attr(cmd);
1873
03e98c9e
NB		 1874 switch (cmd->scsi_sense_reason) {
1875 case TCM_NON_EXISTENT_LUN:
1876 case TCM_UNSUPPORTED_SCSI_OPCODE:
1877 case TCM_INVALID_CDB_FIELD:
1878 case TCM_INVALID_PARAMETER_LIST:
1879 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1880 case TCM_UNKNOWN_MODE_PAGE:
1881 case TCM_WRITE_PROTECTED:
1882 case TCM_CHECK_CONDITION_ABORT_CMD:
1883 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1884 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1885 break;
03e98c9e 1886 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1887 /*
1888 * No SENSE Data payload for this case, set SCSI Status
1889 * and queue the response to $FABRIC_MOD.
1890 *
1891 * Uses linux/include/scsi/scsi.h SAM status codes defs
1892 */
1893 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1894 /*
1895 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1896 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1897 * CONFLICT STATUS.
1898 *
1899 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1900 */
e3d6f909
AG		 1901 if (cmd->se_sess &&
1902 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1903 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1904 cmd->orig_fe_lun, 0x2C,
1905 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1906
07bde79a 1907 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1908 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1909 goto queue_full;
c66ac9db 1910 goto check_stop;
c66ac9db 1911 default:
6708bb27 1912 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1913 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1914 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1915 break;
1916 }
16ab8e60
NB		 1917 /*
1918 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1919 * make the call to transport_send_check_condition_and_sense()
1920 * directly. Otherwise expect the fabric to make the call to
1921 * transport_send_check_condition_and_sense() after handling
1922 * possible unsoliticied write data payloads.
1923 */
03e98c9e
NB		 1924 ret = transport_send_check_condition_and_sense(cmd,
1925 cmd->scsi_sense_reason, 0);
1926 if (ret == -EAGAIN || ret == -ENOMEM)
1927 goto queue_full;
07bde79a 1928
c66ac9db
NB		 1929check_stop:
1930 transport_lun_remove_cmd(cmd);
6708bb27 1931 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1932 ;
07bde79a
NB		 1933 return;
1934
1935queue_full:
e057f533
CH		 1936 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1937 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1938}
1939
c66ac9db
NB		 1940static inline u32 transport_lba_21(unsigned char *cdb)
1941{
1942 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1943}
1944
1945static inline u32 transport_lba_32(unsigned char *cdb)
1946{
1947 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1948}
1949
1950static inline unsigned long long transport_lba_64(unsigned char *cdb)
1951{
1952 unsigned int __v1, __v2;
1953
1954 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1955 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1956
1957 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1958}
1959
1960/*
1961 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1962 */
1963static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1964{
1965 unsigned int __v1, __v2;
1966
1967 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1968 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1969
1970 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1971}
1972
1973static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1974{
1975 unsigned long flags;
1976
a1d8b49a 1977 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 1978 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 1979 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 1980}
1981
c66ac9db
NB		 1982/*
1983 * Called from Fabric Module context from transport_execute_tasks()
1984 *
1985 * The return of this function determins if the tasks from struct se_cmd
1986 * get added to the execution queue in transport_execute_tasks(),
1987 * or are added to the delayed or ordered lists here.
1988 */
1989static inline int transport_execute_task_attr(struct se_cmd *cmd)
1990{
5951146d 1991 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1992 return 1;
1993 /*
25985edc 1994 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1995 * to allow the passed struct se_cmd list of tasks to the front of the list.
1996 */
e66ecd50 1997 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
6708bb27 1998 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 1999 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2000 cmd->t_task_cdb[0],
c66ac9db
NB		 2001 cmd->se_ordered_id);
2002 return 1;
e66ecd50 2003 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d 2004 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2005 smp_mb__after_atomic_inc();
2006
6708bb27 2007 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2008 " list, se_ordered_id: %u\n",
a1d8b49a 2009 cmd->t_task_cdb[0],
c66ac9db
NB		 2010 cmd->se_ordered_id);
2011 /*
2012 * Add ORDERED command to tail of execution queue if
2013 * no other older commands exist that need to be
2014 * completed first.
2015 */
6708bb27 2016 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2017 return 1;
2018 } else {
2019 /*
2020 * For SIMPLE and UNTAGGED Task Attribute commands
2021 */
5951146d 2022 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2023 smp_mb__after_atomic_inc();
2024 }
2025 /*
2026 * Otherwise if one or more outstanding ORDERED task attribute exist,
2027 * add the dormant task(s) built for the passed struct se_cmd to the
2028 * execution queue and become in Active state for this struct se_device.
2029 */
5951146d 2030 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2031 /*
2032 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2033 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2034 */
5951146d 2035 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2036 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2037 list_add_tail(&cmd->se_delayed_node,
2038 &cmd->se_dev->delayed_cmd_list);
2039 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2040
6708bb27 2041 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2042 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2043 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2044 cmd->se_ordered_id);
2045 /*
2046 * Return zero to let transport_execute_tasks() know
2047 * not to add the delayed tasks to the execution list.
2048 */
2049 return 0;
2050 }
2051 /*
2052 * Otherwise, no ORDERED task attributes exist..
2053 */
2054 return 1;
2055}
2056
2057/*
2058 * Called from fabric module context in transport_generic_new_cmd() and
2059 * transport_generic_process_write()
2060 */
2061static int transport_execute_tasks(struct se_cmd *cmd)
2062{
2063 int add_tasks;
40be67f4 2064 struct se_device *se_dev = cmd->se_dev;
c66ac9db
NB		 2065 /*
2066 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2067 * has occurred that prevents execution.
c66ac9db 2068 */
6708bb27 2069 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2070 /*
2071 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2072 * attribute for the tasks of the received struct se_cmd CDB
2073 */
2074 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2075 if (!add_tasks)
c66ac9db
NB		 2076 goto execute_tasks;
2077 /*
4d2300cc
NB		 2078 * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2079 * adds associated se_tasks while holding dev->execute_task_lock
2080 * before I/O dispath to avoid a double spinlock access.
c66ac9db 2081 */
4d2300cc
NB		 2082 __transport_execute_tasks(se_dev, cmd);
2083 return 0;
c66ac9db 2084 }
4d2300cc 2085
c66ac9db 2086execute_tasks:
4d2300cc 2087 __transport_execute_tasks(se_dev, NULL);
c66ac9db
NB		 2088 return 0;
2089}
2090
2091/*
2092 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2093 * from struct se_device->execute_task_list and
2094 *
2095 * Called from transport_processing_thread()
2096 */
4d2300cc 2097static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
c66ac9db
NB		 2098{
2099 int error;
2100 struct se_cmd *cmd = NULL;
e3d6f909 2101 struct se_task *task = NULL;
c66ac9db
NB		 2102 unsigned long flags;
2103
c66ac9db 2104check_depth:
e3d6f909 2105 spin_lock_irq(&dev->execute_task_lock);
4d2300cc
NB		 2106 if (new_cmd != NULL)
2107 __transport_add_tasks_from_cmd(new_cmd);
2108
e3d6f909
AG		 2109 if (list_empty(&dev->execute_task_list)) {
2110 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2111 return 0;
2112 }
e3d6f909
AG		 2113 task = list_first_entry(&dev->execute_task_list,
2114 struct se_task, t_execute_list);
04629b7b 2115 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2116 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db 2117
e3d6f909 2118 cmd = task->task_se_cmd;
a1d8b49a 2119 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2120 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2121 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2122
a1d8b49a
AG		 2123 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2124 cmd->t_task_list_num)
415a090a 2125 atomic_set(&cmd->t_transport_sent, 1);
c66ac9db 2126
a1d8b49a 2127 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2128
5bda90c8
CH		 2129 if (cmd->execute_task)
2130 error = cmd->execute_task(task);
2131 else
2132 error = dev->transport->do_task(task);
d29a5b6a 2133 if (error != 0) {
d29a5b6a
CH		 2134 spin_lock_irqsave(&cmd->t_state_lock, flags);
2135 task->task_flags &= ~TF_ACTIVE;
2136 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2137 atomic_set(&cmd->t_transport_sent, 0);
2138 transport_stop_tasks_for_cmd(cmd);
03e98c9e 2139 transport_generic_request_failure(cmd);
c66ac9db
NB		 2140 }
2141
4d2300cc 2142 new_cmd = NULL;
c66ac9db
NB		 2143 goto check_depth;
2144
2145 return 0;
2146}
2147
c66ac9db
NB		 2148static inline u32 transport_get_sectors_6(
2149 unsigned char *cdb,
2150 struct se_cmd *cmd,
2151 int *ret)
2152{
5951146d 2153 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2154
2155 /*
2156 * Assume TYPE_DISK for non struct se_device objects.
2157 * Use 8-bit sector value.
2158 */
2159 if (!dev)
2160 goto type_disk;
2161
2162 /*
2163 * Use 24-bit allocation length for TYPE_TAPE.
2164 */
e3d6f909 2165 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2166 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2167
2168 /*
2169 * Everything else assume TYPE_DISK Sector CDB location.
9b5cd7f3
RD		 2170 * Use 8-bit sector value. SBC-3 says:
2171 *
2172 * A TRANSFER LENGTH field set to zero specifies that 256
2173 * logical blocks shall be written. Any other value
2174 * specifies the number of logical blocks that shall be
2175 * written.
c66ac9db
NB		 2176 */
2177type_disk:
9b5cd7f3 2178 return cdb[4] ? : 256;
c66ac9db
NB		 2179}
2180
2181static inline u32 transport_get_sectors_10(
2182 unsigned char *cdb,
2183 struct se_cmd *cmd,
2184 int *ret)
2185{
5951146d 2186 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2187
2188 /*
2189 * Assume TYPE_DISK for non struct se_device objects.
2190 * Use 16-bit sector value.
2191 */
2192 if (!dev)
2193 goto type_disk;
2194
2195 /*
2196 * XXX_10 is not defined in SSC, throw an exception
2197 */
e3d6f909
AG		 2198 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2199 *ret = -EINVAL;
c66ac9db
NB		 2200 return 0;
2201 }
2202
2203 /*
2204 * Everything else assume TYPE_DISK Sector CDB location.
2205 * Use 16-bit sector value.
2206 */
2207type_disk:
2208 return (u32)(cdb[7] << 8) + cdb[8];
2209}
2210
2211static inline u32 transport_get_sectors_12(
2212 unsigned char *cdb,
2213 struct se_cmd *cmd,
2214 int *ret)
2215{
5951146d 2216 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2217
2218 /*
2219 * Assume TYPE_DISK for non struct se_device objects.
2220 * Use 32-bit sector value.
2221 */
2222 if (!dev)
2223 goto type_disk;
2224
2225 /*
2226 * XXX_12 is not defined in SSC, throw an exception
2227 */
e3d6f909
AG		 2228 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2229 *ret = -EINVAL;
c66ac9db
NB		 2230 return 0;
2231 }
2232
2233 /*
2234 * Everything else assume TYPE_DISK Sector CDB location.
2235 * Use 32-bit sector value.
2236 */
2237type_disk:
2238 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2239}
2240
2241static inline u32 transport_get_sectors_16(
2242 unsigned char *cdb,
2243 struct se_cmd *cmd,
2244 int *ret)
2245{
5951146d 2246 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2247
2248 /*
2249 * Assume TYPE_DISK for non struct se_device objects.
2250 * Use 32-bit sector value.
2251 */
2252 if (!dev)
2253 goto type_disk;
2254
2255 /*
2256 * Use 24-bit allocation length for TYPE_TAPE.
2257 */
e3d6f909 2258 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2259 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2260
2261type_disk:
2262 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2263 (cdb[12] << 8) + cdb[13];
2264}
2265
2266/*
2267 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2268 */
2269static inline u32 transport_get_sectors_32(
2270 unsigned char *cdb,
2271 struct se_cmd *cmd,
2272 int *ret)
2273{
2274 /*
2275 * Assume TYPE_DISK for non struct se_device objects.
2276 * Use 32-bit sector value.
2277 */
2278 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2279 (cdb[30] << 8) + cdb[31];
2280
2281}
2282
2283static inline u32 transport_get_size(
2284 u32 sectors,
2285 unsigned char *cdb,
2286 struct se_cmd *cmd)
2287{
5951146d 2288 struct se_device *dev = cmd->se_dev;
c66ac9db 2289
e3d6f909 2290 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2291 if (cdb[1] & 1) { /* sectors */
e3d6f909 2292 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2293 } else /* bytes */
2294 return sectors;
2295 }
2296#if 0
6708bb27 2297 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2298 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2299 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2300 dev->transport->name);
c66ac9db 2301#endif
e3d6f909 2302 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2303}
2304
c66ac9db
NB		 2305static void transport_xor_callback(struct se_cmd *cmd)
2306{
2307 unsigned char *buf, *addr;
ec98f782 2308 struct scatterlist *sg;
c66ac9db
NB		 2309 unsigned int offset;
2310 int i;
ec98f782 2311 int count;
c66ac9db
NB		 2312 /*
2313 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2314 *
2315 * 1) read the specified logical block(s);
2316 * 2) transfer logical blocks from the data-out buffer;
2317 * 3) XOR the logical blocks transferred from the data-out buffer with
2318 * the logical blocks read, storing the resulting XOR data in a buffer;
2319 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2320 * blocks transferred from the data-out buffer; and
2321 * 5) transfer the resulting XOR data to the data-in buffer.
2322 */
2323 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2324 if (!buf) {
2325 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2326 return;
2327 }
2328 /*
ec98f782 2329 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2330 * into the locally allocated *buf
2331 */
ec98f782
AG		 2332 sg_copy_to_buffer(cmd->t_data_sg,
2333 cmd->t_data_nents,
2334 buf,
2335 cmd->data_length);
2336
c66ac9db
NB		 2337 /*
2338 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2339 * cmd->t_mem_bidi_list
c66ac9db
NB		 2340 */
2341
2342 offset = 0;
ec98f782
AG		 2343 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2344 addr = kmap_atomic(sg_page(sg), KM_USER0);
2345 if (!addr)
c66ac9db
NB		 2346 goto out;
2347
ec98f782
AG		 2348 for (i = 0; i < sg->length; i++)
2349 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2350
ec98f782 2351 offset += sg->length;
c66ac9db
NB		 2352 kunmap_atomic(addr, KM_USER0);
2353 }
ec98f782 2354
c66ac9db
NB		 2355out:
2356 kfree(buf);
2357}
2358
2359/*
2360 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2361 */
2362static int transport_get_sense_data(struct se_cmd *cmd)
2363{
2364 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2365 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2366 struct se_task *task = NULL, *task_tmp;
2367 unsigned long flags;
2368 u32 offset = 0;
2369
e3d6f909
AG		 2370 WARN_ON(!cmd->se_lun);
2371
42bf829e
CH		 2372 if (!dev)
2373 return 0;
2374
a1d8b49a 2375 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2376 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2377 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2378 return 0;
2379 }
2380
2381 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2382 &cmd->t_task_list, t_list) {
ef804a84 2383 if (!(task->task_flags & TF_HAS_SENSE))
c66ac9db
NB		 2384 continue;
2385
e3d6f909 2386 if (!dev->transport->get_sense_buffer) {
6708bb27 2387 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2388 " is NULL\n");
2389 continue;
2390 }
2391
e3d6f909 2392 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2393 if (!sense_buffer) {
04629b7b 2394 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2395 " sense buffer for task with sense\n",
04629b7b 2396 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2397 continue;
2398 }
a1d8b49a 2399 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2400
e3d6f909 2401 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2402 TRANSPORT_SENSE_BUFFER);
2403
5951146d 2404 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2405 TRANSPORT_SENSE_BUFFER);
2406 cmd->scsi_status = task->task_scsi_status;
2407 /* Automatically padded */
2408 cmd->scsi_sense_length =
2409 (TRANSPORT_SENSE_BUFFER + offset);
2410
6708bb27 2411 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2412 " and sense\n",
e3d6f909 2413 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2414 cmd->scsi_status);
2415 return 0;
2416 }
a1d8b49a 2417 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2418
2419 return -1;
2420}
2421
ec98f782
AG		 2422static inline long long transport_dev_end_lba(struct se_device *dev)
2423{
2424 return dev->transport->get_blocks(dev) + 1;
2425}
2426
2427static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2428{
2429 struct se_device *dev = cmd->se_dev;
2430 u32 sectors;
2431
2432 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2433 return 0;
2434
2435 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2436
6708bb27
AG		 2437 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2438 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2439 " transport_dev_end_lba(): %llu\n",
2440 cmd->t_task_lba, sectors,
2441 transport_dev_end_lba(dev));
7abbe7f3 2442 return -EINVAL;
ec98f782
AG		 2443 }
2444
7abbe7f3 2445 return 0;
ec98f782
AG		 2446}
2447
706d5860
NB		 2448static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2449{
2450 /*
2451 * Determine if the received WRITE_SAME is used to for direct
2452 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2453 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2454 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2455 */
2456 int passthrough = (dev->transport->transport_type ==
2457 TRANSPORT_PLUGIN_PHBA_PDEV);
2458
2459 if (!passthrough) {
2460 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2461 pr_err("WRITE_SAME PBDATA and LBDATA"
2462 " bits not supported for Block Discard"
2463 " Emulation\n");
2464 return -ENOSYS;
2465 }
2466 /*
2467 * Currently for the emulated case we only accept
2468 * tpws with the UNMAP=1 bit set.
2469 */
2470 if (!(flags[0] & 0x08)) {
2471 pr_err("WRITE_SAME w/o UNMAP bit not"
2472 " supported for Block Discard Emulation\n");
2473 return -ENOSYS;
2474 }
2475 }
2476
2477 return 0;
2478}
2479
c66ac9db
NB		 2480/* transport_generic_cmd_sequencer():
2481 *
2482 * Generic Command Sequencer that should work for most DAS transport
2483 * drivers.
2484 *
2485 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2486 * RX Thread.
2487 *
2488 * FIXME: Need to support other SCSI OPCODES where as well.
2489 */
2490static int transport_generic_cmd_sequencer(
2491 struct se_cmd *cmd,
2492 unsigned char *cdb)
2493{
5951146d 2494 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2495 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2496 int ret = 0, sector_ret = 0, passthrough;
2497 u32 sectors = 0, size = 0, pr_reg_type = 0;
2498 u16 service_action;
2499 u8 alua_ascq = 0;
2500 /*
2501 * Check for an existing UNIT ATTENTION condition
2502 */
2503 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2504 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2505 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2506 return -EINVAL;
c66ac9db
NB		 2507 }
2508 /*
2509 * Check status of Asymmetric Logical Unit Assignment port
2510 */
e3d6f909 2511 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2512 if (ret != 0) {
c66ac9db 2513 /*
25985edc 2514 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2515 * The ALUA additional sense code qualifier (ASCQ) is determined
2516 * by the ALUA primary or secondary access state..
2517 */
2518 if (ret > 0) {
2519#if 0
6708bb27 2520 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2521 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2522 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2523#endif
2524 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2525 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2526 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2527 return -EINVAL;
c66ac9db
NB		 2528 }
2529 goto out_invalid_cdb_field;
2530 }
2531 /*
2532 * Check status for SPC-3 Persistent Reservations
2533 */
e3d6f909
AG		 2534 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2535 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2536 cmd, cdb, pr_reg_type) != 0) {
2537 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2538 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2539 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2540 return -EBUSY;
2541 }
c66ac9db
NB		 2542 /*
2543 * This means the CDB is allowed for the SCSI Initiator port
2544 * when said port is *NOT* holding the legacy SPC-2 or
2545 * SPC-3 Persistent Reservation.
2546 */
2547 }
2548
5bda90c8
CH		 2549 /*
2550 * If we operate in passthrough mode we skip most CDB emulation and
2551 * instead hand the commands down to the physical SCSI device.
2552 */
2553 passthrough =
2554 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2555
c66ac9db
NB		 2556 switch (cdb[0]) {
2557 case READ_6:
2558 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2559 if (sector_ret)
2560 goto out_unsupported_cdb;
2561 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2562 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2563 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2564 break;
2565 case READ_10:
2566 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2567 if (sector_ret)
2568 goto out_unsupported_cdb;
2569 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2570 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2571 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2572 break;
2573 case READ_12:
2574 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2575 if (sector_ret)
2576 goto out_unsupported_cdb;
2577 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2578 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2579 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2580 break;
2581 case READ_16:
2582 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2583 if (sector_ret)
2584 goto out_unsupported_cdb;
2585 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2586 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2587 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2588 break;
2589 case WRITE_6:
2590 sectors = transport_get_sectors_6(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_21(cdb);
c66ac9db
NB		 2595 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2596 break;
2597 case WRITE_10:
2598 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2599 if (sector_ret)
2600 goto out_unsupported_cdb;
2601 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2602 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2603 if (cdb[1] & 0x8)
2604 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2605 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2606 break;
2607 case WRITE_12:
2608 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2609 if (sector_ret)
2610 goto out_unsupported_cdb;
2611 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2612 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2613 if (cdb[1] & 0x8)
2614 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2615 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2616 break;
2617 case WRITE_16:
2618 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2619 if (sector_ret)
2620 goto out_unsupported_cdb;
2621 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2622 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2623 if (cdb[1] & 0x8)
2624 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2625 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2626 break;
2627 case XDWRITEREAD_10:
2628 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2629 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2630 goto out_invalid_cdb_field;
2631 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2632 if (sector_ret)
2633 goto out_unsupported_cdb;
2634 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2635 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2636 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2637
5bda90c8
CH		 2638 /*
2639 * Do now allow BIDI commands for passthrough mode.
2640 */
2641 if (passthrough)
7c1c6af3 2642 goto out_unsupported_cdb;
5bda90c8 2643
c66ac9db 2644 /*
35e0e757 2645 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2646 */
2647 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2648 if (cdb[1] & 0x8)
2649 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2650 break;
2651 case VARIABLE_LENGTH_CMD:
2652 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2653 switch (service_action) {
2654 case XDWRITEREAD_32:
2655 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2656 if (sector_ret)
2657 goto out_unsupported_cdb;
2658 size = transport_get_size(sectors, cdb, cmd);
2659 /*
2660 * Use WRITE_32 and READ_32 opcodes for the emulated
2661 * XDWRITE_READ_32 logic.
2662 */
a1d8b49a 2663 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2664 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2665
5bda90c8
CH		 2666 /*
2667 * Do now allow BIDI commands for passthrough mode.
2668 */
c66ac9db 2669 if (passthrough)
7c1c6af3 2670 goto out_unsupported_cdb;
5bda90c8 2671
c66ac9db 2672 /*
35e0e757
CH		 2673 * Setup BIDI XOR callback to be run during after I/O
2674 * completion.
c66ac9db
NB		 2675 */
2676 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2677 if (cdb[1] & 0x8)
2678 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2679 break;
2680 case WRITE_SAME_32:
2681 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2682 if (sector_ret)
2683 goto out_unsupported_cdb;
dd3a5ad8 2684
6708bb27 2685 if (sectors)
12850626 2686 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2687 else {
2688 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2689 " supported\n");
2690 goto out_invalid_cdb_field;
2691 }
dd3a5ad8 2692
a1d8b49a 2693 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2694 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2695
706d5860 2696 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2697 goto out_invalid_cdb_field;
5bda90c8
CH		 2698 if (!passthrough)
2699 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2700 break;
2701 default:
6708bb27 2702 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2703 " 0x%04x not supported\n", service_action);
2704 goto out_unsupported_cdb;
2705 }
2706 break;
e434f1f1 2707 case MAINTENANCE_IN:
e3d6f909 2708 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2709 /* MAINTENANCE_IN from SCC-2 */
2710 /*
2711 * Check for emulated MI_REPORT_TARGET_PGS.
2712 */
e76a35d6
CH		 2713 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2714 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2715 cmd->execute_task =
2716 target_emulate_report_target_port_groups;
c66ac9db
NB		 2717 }
2718 size = (cdb[6] << 24) | (cdb[7] << 16) |
2719 (cdb[8] << 8) | cdb[9];
2720 } else {
2721 /* GPCMD_SEND_KEY from multi media commands */
2722 size = (cdb[8] << 8) + cdb[9];
2723 }
05d1c7c0 2724 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2725 break;
2726 case MODE_SELECT:
2727 size = cdb[4];
2728 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2729 break;
2730 case MODE_SELECT_10:
2731 size = (cdb[7] << 8) + cdb[8];
2732 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2733 break;
2734 case MODE_SENSE:
2735 size = cdb[4];
05d1c7c0 2736 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2737 if (!passthrough)
2738 cmd->execute_task = target_emulate_modesense;
c66ac9db
NB		 2739 break;
2740 case MODE_SENSE_10:
5bda90c8
CH		 2741 size = (cdb[7] << 8) + cdb[8];
2742 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2743 if (!passthrough)
2744 cmd->execute_task = target_emulate_modesense;
2745 break;
c66ac9db
NB		 2746 case GPCMD_READ_BUFFER_CAPACITY:
2747 case GPCMD_SEND_OPC:
2748 case LOG_SELECT:
2749 case LOG_SENSE:
2750 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2751 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2752 break;
2753 case READ_BLOCK_LIMITS:
2754 size = READ_BLOCK_LEN;
05d1c7c0 2755 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2756 break;
2757 case GPCMD_GET_CONFIGURATION:
2758 case GPCMD_READ_FORMAT_CAPACITIES:
2759 case GPCMD_READ_DISC_INFO:
2760 case GPCMD_READ_TRACK_RZONE_INFO:
2761 size = (cdb[7] << 8) + cdb[8];
2762 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2763 break;
2764 case PERSISTENT_RESERVE_IN:
617c0e06 2765 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2766 cmd->execute_task = target_scsi3_emulate_pr_in;
617c0e06
CH		 2767 size = (cdb[7] << 8) + cdb[8];
2768 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2769 break;
c66ac9db 2770 case PERSISTENT_RESERVE_OUT:
617c0e06 2771 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2772 cmd->execute_task = target_scsi3_emulate_pr_out;
c66ac9db 2773 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2774 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2775 break;
2776 case GPCMD_MECHANISM_STATUS:
2777 case GPCMD_READ_DVD_STRUCTURE:
2778 size = (cdb[8] << 8) + cdb[9];
2779 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2780 break;
2781 case READ_POSITION:
2782 size = READ_POSITION_LEN;
05d1c7c0 2783 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2784 break;
e434f1f1 2785 case MAINTENANCE_OUT:
e3d6f909 2786 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2787 /* MAINTENANCE_OUT from SCC-2
2788 *
2789 * Check for emulated MO_SET_TARGET_PGS.
2790 */
e76a35d6
CH		 2791 if (cdb[1] == MO_SET_TARGET_PGS &&
2792 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2793 cmd->execute_task =
2794 target_emulate_set_target_port_groups;
c66ac9db
NB		 2795 }
2796
2797 size = (cdb[6] << 24) | (cdb[7] << 16) |
2798 (cdb[8] << 8) | cdb[9];
2799 } else {
2800 /* GPCMD_REPORT_KEY from multi media commands */
2801 size = (cdb[8] << 8) + cdb[9];
2802 }
05d1c7c0 2803 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2804 break;
2805 case INQUIRY:
2806 size = (cdb[3] << 8) + cdb[4];
2807 /*
2808 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2809 * See spc4r17 section 5.3
2810 */
5951146d 2811 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2812 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2813 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2814 if (!passthrough)
2815 cmd->execute_task = target_emulate_inquiry;
c66ac9db
NB		 2816 break;
2817 case READ_BUFFER:
2818 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2819 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2820 break;
2821 case READ_CAPACITY:
2822 size = READ_CAP_LEN;
05d1c7c0 2823 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2824 if (!passthrough)
2825 cmd->execute_task = target_emulate_readcapacity;
c66ac9db
NB		 2826 break;
2827 case READ_MEDIA_SERIAL_NUMBER:
2828 case SECURITY_PROTOCOL_IN:
2829 case SECURITY_PROTOCOL_OUT:
2830 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2831 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2832 break;
2833 case SERVICE_ACTION_IN:
5bda90c8
CH		 2834 switch (cmd->t_task_cdb[1] & 0x1f) {
2835 case SAI_READ_CAPACITY_16:
2836 if (!passthrough)
2837 cmd->execute_task =
2838 target_emulate_readcapacity_16;
2839 break;
2840 default:
2841 if (passthrough)
2842 break;
2843
2844 pr_err("Unsupported SA: 0x%02x\n",
2845 cmd->t_task_cdb[1] & 0x1f);
2846 goto out_unsupported_cdb;
2847 }
2848 /*FALLTHROUGH*/
c66ac9db
NB		 2849 case ACCESS_CONTROL_IN:
2850 case ACCESS_CONTROL_OUT:
2851 case EXTENDED_COPY:
2852 case READ_ATTRIBUTE:
2853 case RECEIVE_COPY_RESULTS:
2854 case WRITE_ATTRIBUTE:
2855 size = (cdb[10] << 24) | (cdb[11] << 16) |
2856 (cdb[12] << 8) | cdb[13];
05d1c7c0 2857 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2858 break;
2859 case RECEIVE_DIAGNOSTIC:
2860 case SEND_DIAGNOSTIC:
2861 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2862 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2863 break;
2864/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2865#if 0
2866 case GPCMD_READ_CD:
2867 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2868 size = (2336 * sectors);
05d1c7c0 2869 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2870 break;
2871#endif
2872 case READ_TOC:
2873 size = cdb[8];
05d1c7c0 2874 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2875 break;
2876 case REQUEST_SENSE:
2877 size = cdb[4];
05d1c7c0 2878 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2879 if (!passthrough)
2880 cmd->execute_task = target_emulate_request_sense;
c66ac9db
NB		 2881 break;
2882 case READ_ELEMENT_STATUS:
2883 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2884 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2885 break;
2886 case WRITE_BUFFER:
2887 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2888 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2889 break;
2890 case RESERVE:
2891 case RESERVE_10:
2892 /*
2893 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2894 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2895 */
2896 if (cdb[0] == RESERVE_10)
2897 size = (cdb[7] << 8) | cdb[8];
2898 else
2899 size = cmd->data_length;
2900
2901 /*
2902 * Setup the legacy emulated handler for SPC-2 and
2903 * >= SPC-3 compatible reservation handling (CRH=1)
2904 * Otherwise, we assume the underlying SCSI logic is
2905 * is running in SPC_PASSTHROUGH, and wants reservations
2906 * emulation disabled.
2907 */
e76a35d6
CH		 2908 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2909 cmd->execute_task = target_scsi2_reservation_reserve;
c66ac9db
NB		 2910 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2911 break;
2912 case RELEASE:
2913 case RELEASE_10:
2914 /*
2915 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2916 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2917 */
2918 if (cdb[0] == RELEASE_10)
2919 size = (cdb[7] << 8) | cdb[8];
2920 else
2921 size = cmd->data_length;
2922
e76a35d6
CH		 2923 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2924 cmd->execute_task = target_scsi2_reservation_release;
c66ac9db
NB		 2925 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2926 break;
2927 case SYNCHRONIZE_CACHE:
2928 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2929 /*
2930 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2931 */
2932 if (cdb[0] == SYNCHRONIZE_CACHE) {
2933 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2934 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2935 } else {
2936 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2937 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2938 }
2939 if (sector_ret)
2940 goto out_unsupported_cdb;
2941
2942 size = transport_get_size(sectors, cdb, cmd);
2943 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2944
5bda90c8 2945 if (passthrough)
c66ac9db 2946 break;
5bda90c8 2947
c66ac9db
NB		 2948 /*
2949 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 2950 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 2951 */
7abbe7f3
NB		 2952 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2953 if (transport_cmd_get_valid_sectors(cmd) < 0)
2954 goto out_invalid_cdb_field;
2955 }
5bda90c8 2956 cmd->execute_task = target_emulate_synchronize_cache;
c66ac9db
NB		 2957 break;
2958 case UNMAP:
2959 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 2960 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2961 if (!passthrough)
2962 cmd->execute_task = target_emulate_unmap;
c66ac9db
NB		 2963 break;
2964 case WRITE_SAME_16:
2965 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2966 if (sector_ret)
2967 goto out_unsupported_cdb;
dd3a5ad8 2968
6708bb27 2969 if (sectors)
12850626 2970 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2971 else {
2972 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2973 goto out_invalid_cdb_field;
2974 }
dd3a5ad8 2975
5db0753b 2976 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 2977 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2978
2979 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2980 goto out_invalid_cdb_field;
5bda90c8
CH		 2981 if (!passthrough)
2982 cmd->execute_task = target_emulate_write_same;
706d5860
NB		 2983 break;
2984 case WRITE_SAME:
2985 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2986 if (sector_ret)
2987 goto out_unsupported_cdb;
2988
2989 if (sectors)
12850626 2990 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 2991 else {
2992 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2993 goto out_invalid_cdb_field;
c66ac9db 2994 }
706d5860
NB		 2995
2996 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 2997 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 2998 /*
2999 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3000 * of byte 1 bit 3 UNMAP instead of original reserved field
3001 */
3002 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3003 goto out_invalid_cdb_field;
5bda90c8
CH		 3004 if (!passthrough)
3005 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 3006 break;
3007 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 3008 case ERASE:
c66ac9db
NB		 3009 case REZERO_UNIT:
3010 case SEEK_10:
c66ac9db
NB		 3011 case SPACE:
3012 case START_STOP:
3013 case TEST_UNIT_READY:
3014 case VERIFY:
3015 case WRITE_FILEMARKS:
5bda90c8
CH		 3016 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3017 if (!passthrough)
3018 cmd->execute_task = target_emulate_noop;
3019 break;
3020 case GPCMD_CLOSE_TRACK:
3021 case INITIALIZE_ELEMENT_STATUS:
3022 case GPCMD_LOAD_UNLOAD:
3023 case GPCMD_SET_SPEED:
c66ac9db
NB		 3024 case MOVE_MEDIUM:
3025 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3026 break;
3027 case REPORT_LUNS:
e76a35d6 3028 cmd->execute_task = target_report_luns;
c66ac9db
NB		 3029 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3030 /*
3031 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3032 * See spc4r17 section 5.3
3033 */
5951146d 3034 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3035 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3036 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3037 break;
3038 default:
6708bb27 3039 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3040 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3041 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3042 goto out_unsupported_cdb;
3043 }
3044
3045 if (size != cmd->data_length) {
6708bb27 3046 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3047 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3048 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3049 cmd->data_length, size, cdb[0]);
3050
3051 cmd->cmd_spdtl = size;
3052
3053 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3054 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3055 " WRITE data\n");
3056 goto out_invalid_cdb_field;
3057 }
3058 /*
3059 * Reject READ_* or WRITE_* with overflow/underflow for
3060 * type SCF_SCSI_DATA_SG_IO_CDB.
3061 */
6708bb27
AG		 3062 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3063 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3064 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3065 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3066 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3067 goto out_invalid_cdb_field;
3068 }
3069
3070 if (size > cmd->data_length) {
3071 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3072 cmd->residual_count = (size - cmd->data_length);
3073 } else {
3074 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3075 cmd->residual_count = (cmd->data_length - size);
3076 }
3077 cmd->data_length = size;
3078 }
3079
5bda90c8
CH		 3080 /* reject any command that we don't have a handler for */
3081 if (!(passthrough || cmd->execute_task ||
3082 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3083 goto out_unsupported_cdb;
3084
d0229ae3
AG		 3085 /* Let's limit control cdbs to a page, for simplicity's sake. */
3086 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3087 size > PAGE_SIZE)
3088 goto out_invalid_cdb_field;
3089
c66ac9db
NB		 3090 transport_set_supported_SAM_opcode(cmd);
3091 return ret;
3092
3093out_unsupported_cdb:
3094 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3095 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3096 return -EINVAL;
c66ac9db
NB		 3097out_invalid_cdb_field:
3098 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3099 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3100 return -EINVAL;
c66ac9db
NB		 3101}
3102
c66ac9db 3103/*
35e0e757 3104 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3105 * and ordered cmds need to have their tasks added to the execution queue.
3106 */
3107static void transport_complete_task_attr(struct se_cmd *cmd)
3108{
5951146d 3109 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3110 struct se_cmd *cmd_p, *cmd_tmp;
3111 int new_active_tasks = 0;
3112
e66ecd50 3113 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3114 atomic_dec(&dev->simple_cmds);
3115 smp_mb__after_atomic_dec();
3116 dev->dev_cur_ordered_id++;
6708bb27 3117 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3118 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3119 cmd->se_ordered_id);
e66ecd50 3120 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3121 dev->dev_cur_ordered_id++;
6708bb27 3122 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3123 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3124 cmd->se_ordered_id);
e66ecd50 3125 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3126 atomic_dec(&dev->dev_ordered_sync);
3127 smp_mb__after_atomic_dec();
c66ac9db
NB		 3128
3129 dev->dev_cur_ordered_id++;
6708bb27 3130 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3131 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3132 }
3133 /*
3134 * Process all commands up to the last received
3135 * ORDERED task attribute which requires another blocking
3136 * boundary
3137 */
3138 spin_lock(&dev->delayed_cmd_lock);
3139 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3140 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3141
5951146d 3142 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3143 spin_unlock(&dev->delayed_cmd_lock);
3144
6708bb27 3145 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3146 " cmd_p: 0x%02x Task Attr: 0x%02x"
3147 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3148 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3149 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3150
3151 transport_add_tasks_from_cmd(cmd_p);
3152 new_active_tasks++;
3153
3154 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3155 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3156 break;
3157 }
3158 spin_unlock(&dev->delayed_cmd_lock);
3159 /*
3160 * If new tasks have become active, wake up the transport thread
3161 * to do the processing of the Active tasks.
3162 */
3163 if (new_active_tasks != 0)
e3d6f909 3164 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3165}
3166
e057f533 3167static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3168{
3169 int ret = 0;
3170
e057f533
CH		 3171 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3172 transport_complete_task_attr(cmd);
3173
3174 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3175 ret = cmd->se_tfo->queue_status(cmd);
3176 if (ret)
3177 goto out;
3178 }
07bde79a
NB		 3179
3180 switch (cmd->data_direction) {
3181 case DMA_FROM_DEVICE:
3182 ret = cmd->se_tfo->queue_data_in(cmd);
3183 break;
3184 case DMA_TO_DEVICE:
ec98f782 3185 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3186 ret = cmd->se_tfo->queue_data_in(cmd);
3187 if (ret < 0)
e057f533 3188 break;
07bde79a
NB		 3189 }
3190 /* Fall through for DMA_TO_DEVICE */
3191 case DMA_NONE:
3192 ret = cmd->se_tfo->queue_status(cmd);
3193 break;
3194 default:
3195 break;
3196 }
3197
e057f533
CH		 3198out:
3199 if (ret < 0) {
3200 transport_handle_queue_full(cmd, cmd->se_dev);
3201 return;
3202 }
3203 transport_lun_remove_cmd(cmd);
3204 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3205}
3206
3207static void transport_handle_queue_full(
3208 struct se_cmd *cmd,
e057f533 3209 struct se_device *dev)
07bde79a
NB		 3210{
3211 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3212 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3213 atomic_inc(&dev->dev_qf_count);
3214 smp_mb__after_atomic_inc();
3215 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3216
3217 schedule_work(&cmd->se_dev->qf_work_queue);
3218}
3219
35e0e757 3220static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3221{
35e0e757 3222 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3223 int reason = 0, ret;
35e0e757 3224
c66ac9db
NB		 3225 /*
3226 * Check if we need to move delayed/dormant tasks from cmds on the
3227 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3228 * Attribute.
3229 */
5951146d 3230 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3231 transport_complete_task_attr(cmd);
07bde79a
NB		 3232 /*
3233 * Check to schedule QUEUE_FULL work, or execute an existing
3234 * cmd->transport_qf_callback()
3235 */
3236 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3237 schedule_work(&cmd->se_dev->qf_work_queue);
3238
c66ac9db
NB		 3239 /*
3240 * Check if we need to retrieve a sense buffer from
3241 * the struct se_cmd in question.
3242 */
3243 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3244 if (transport_get_sense_data(cmd) < 0)
3245 reason = TCM_NON_EXISTENT_LUN;
3246
3247 /*
3248 * Only set when an struct se_task->task_scsi_status returned
3249 * a non GOOD status.
3250 */
3251 if (cmd->scsi_status) {
07bde79a 3252 ret = transport_send_check_condition_and_sense(
c66ac9db 3253 cmd, reason, 1);
f147abb4 3254 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3255 goto queue_full;
3256
c66ac9db
NB		 3257 transport_lun_remove_cmd(cmd);
3258 transport_cmd_check_stop_to_fabric(cmd);
3259 return;
3260 }
3261 }
3262 /*
25985edc 3263 * Check for a callback, used by amongst other things
c66ac9db
NB		 3264 * XDWRITE_READ_10 emulation.
3265 */
3266 if (cmd->transport_complete_callback)
3267 cmd->transport_complete_callback(cmd);
3268
3269 switch (cmd->data_direction) {
3270 case DMA_FROM_DEVICE:
3271 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3272 if (cmd->se_lun->lun_sep) {
3273 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3274 cmd->data_length;
3275 }
3276 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3277
07bde79a 3278 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3279 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3280 goto queue_full;
c66ac9db
NB		 3281 break;
3282 case DMA_TO_DEVICE:
3283 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3284 if (cmd->se_lun->lun_sep) {
3285 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3286 cmd->data_length;
3287 }
3288 spin_unlock(&cmd->se_lun->lun_sep_lock);
3289 /*
3290 * Check if we need to send READ payload for BIDI-COMMAND
3291 */
ec98f782 3292 if (cmd->t_bidi_data_sg) {
c66ac9db 3293 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3294 if (cmd->se_lun->lun_sep) {
3295 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3296 cmd->data_length;
3297 }
3298 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3299 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3300 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3301 goto queue_full;
c66ac9db
NB		 3302 break;
3303 }
3304 /* Fall through for DMA_TO_DEVICE */
3305 case DMA_NONE:
07bde79a 3306 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3307 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3308 goto queue_full;
c66ac9db
NB		 3309 break;
3310 default:
3311 break;
3312 }
3313
3314 transport_lun_remove_cmd(cmd);
3315 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3316 return;
3317
3318queue_full:
6708bb27 3319 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3320 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3321 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3322 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3323}
3324
3325static void transport_free_dev_tasks(struct se_cmd *cmd)
3326{
3327 struct se_task *task, *task_tmp;
3328 unsigned long flags;
0c2cfe5f 3329 LIST_HEAD(dispose_list);
c66ac9db 3330
a1d8b49a 3331 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3332 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3333 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3334 if (!(task->task_flags & TF_ACTIVE))
3335 list_move_tail(&task->t_list, &dispose_list);
3336 }
3337 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3338
3339 while (!list_empty(&dispose_list)) {
3340 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3341
af3f00c7
CH		 3342 if (task->task_sg != cmd->t_data_sg &&
3343 task->task_sg != cmd->t_bidi_data_sg)
3344 kfree(task->task_sg);
c66ac9db
NB		 3345
3346 list_del(&task->t_list);
3347
42bf829e 3348 cmd->se_dev->transport->free_task(task);
c66ac9db 3349 }
c66ac9db
NB		 3350}
3351
6708bb27 3352static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3353{
ec98f782 3354 struct scatterlist *sg;
ec98f782 3355 int count;
c66ac9db 3356
6708bb27
AG		 3357 for_each_sg(sgl, sg, nents, count)
3358 __free_page(sg_page(sg));
c66ac9db 3359
6708bb27
AG		 3360 kfree(sgl);
3361}
c66ac9db 3362
6708bb27
AG		 3363static inline void transport_free_pages(struct se_cmd *cmd)
3364{
3365 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3366 return;
3367
3368 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3369 cmd->t_data_sg = NULL;
3370 cmd->t_data_nents = 0;
c66ac9db 3371
6708bb27 3372 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3373 cmd->t_bidi_data_sg = NULL;
3374 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3375}
3376
e26d99ae
CH		 3377/**
3378 * transport_release_cmd - free a command
3379 * @cmd: command to free
3380 *
3381 * This routine unconditionally frees a command, and reference counting
3382 * or list removal must be done in the caller.
3383 */
3384static void transport_release_cmd(struct se_cmd *cmd)
3385{
3386 BUG_ON(!cmd->se_tfo);
3387
3388 if (cmd->se_tmr_req)
3389 core_tmr_release_req(cmd->se_tmr_req);
3390 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3391 kfree(cmd->t_task_cdb);
3392 /*
7481deb4
NB		 3393 * If this cmd has been setup with target_get_sess_cmd(), drop
3394 * the kref and call ->release_cmd() in kref callback.
e26d99ae 3395 */
7481deb4
NB		 3396 if (cmd->check_release != 0) {
3397 target_put_sess_cmd(cmd->se_sess, cmd);
3398 return;
3399 }
e26d99ae
CH		 3400 cmd->se_tfo->release_cmd(cmd);
3401}
3402
d3df7825
CH		 3403/**
3404 * transport_put_cmd - release a reference to a command
3405 * @cmd: command to release
3406 *
3407 * This routine releases our reference to the command and frees it if possible.
3408 */
39c05f32 3409static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3410{
3411 unsigned long flags;
4911e3cc 3412 int free_tasks = 0;
c66ac9db 3413
a1d8b49a 3414 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3415 if (atomic_read(&cmd->t_fe_count)) {
3416 if (!atomic_dec_and_test(&cmd->t_fe_count))
3417 goto out_busy;
3418 }
3419
3420 if (atomic_read(&cmd->t_se_count)) {
3421 if (!atomic_dec_and_test(&cmd->t_se_count))
3422 goto out_busy;
3423 }
3424
3425 if (atomic_read(&cmd->transport_dev_active)) {
3426 atomic_set(&cmd->transport_dev_active, 0);
3427 transport_all_task_dev_remove_state(cmd);
3428 free_tasks = 1;
c66ac9db 3429 }
a1d8b49a 3430 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3431
4911e3cc
CH		 3432 if (free_tasks != 0)
3433 transport_free_dev_tasks(cmd);
d3df7825 3434
c66ac9db 3435 transport_free_pages(cmd);
31afc39c 3436 transport_release_cmd(cmd);
39c05f32 3437 return;
4911e3cc
CH		 3438out_busy:
3439 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3440}
3441
c66ac9db 3442/*
ec98f782
AG		 3443 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3444 * allocating in the core.
c66ac9db
NB		 3445 * @cmd: Associated se_cmd descriptor
3446 * @mem: SGL style memory for TCM WRITE / READ
3447 * @sg_mem_num: Number of SGL elements
3448 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3449 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3450 *
3451 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3452 * of parameters.
3453 */
3454int transport_generic_map_mem_to_cmd(
3455 struct se_cmd *cmd,
5951146d
AG		 3456 struct scatterlist *sgl,
3457 u32 sgl_count,
3458 struct scatterlist *sgl_bidi,
3459 u32 sgl_bidi_count)
c66ac9db 3460{
5951146d 3461 if (!sgl || !sgl_count)
c66ac9db 3462 return 0;
c66ac9db 3463
c66ac9db
NB		 3464 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3465 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
fef58a60
NB		 3466 /*
3467 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3468 * scatterlists already have been set to follow what the fabric
3469 * passes for the original expected data transfer length.
3470 */
3471 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3472 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3473 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3474 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3475 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3476 return -EINVAL;
3477 }
c66ac9db 3478
ec98f782
AG		 3479 cmd->t_data_sg = sgl;
3480 cmd->t_data_nents = sgl_count;
c66ac9db 3481
ec98f782
AG		 3482 if (sgl_bidi && sgl_bidi_count) {
3483 cmd->t_bidi_data_sg = sgl_bidi;
3484 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3485 }
3486 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3487 }
3488
3489 return 0;
3490}
3491EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3492
05d1c7c0
AG		 3493void *transport_kmap_first_data_page(struct se_cmd *cmd)
3494{
ec98f782 3495 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3496
ec98f782 3497 BUG_ON(!sg);
05d1c7c0 3498 /*
ec98f782
AG		 3499 * We need to take into account a possible offset here for fabrics like
3500 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3501 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3502 */
ec98f782 3503 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3504}
3505EXPORT_SYMBOL(transport_kmap_first_data_page);
3506
3507void transport_kunmap_first_data_page(struct se_cmd *cmd)
3508{
ec98f782 3509 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3510}
3511EXPORT_SYMBOL(transport_kunmap_first_data_page);
3512
c66ac9db 3513static int
05d1c7c0 3514transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3515{
ec98f782
AG		 3516 u32 length = cmd->data_length;
3517 unsigned int nents;
3518 struct page *page;
9db9da33 3519 gfp_t zero_flag;
ec98f782 3520 int i = 0;
c66ac9db 3521
ec98f782
AG		 3522 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3523 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3524 if (!cmd->t_data_sg)
3525 return -ENOMEM;
c66ac9db 3526
ec98f782
AG		 3527 cmd->t_data_nents = nents;
3528 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3529
9db9da33 3530 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3531
ec98f782
AG		 3532 while (length) {
3533 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 3534 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 3535 if (!page)
3536 goto out;
c66ac9db 3537
ec98f782
AG		 3538 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3539 length -= page_len;
3540 i++;
c66ac9db 3541 }
c66ac9db 3542 return 0;
c66ac9db 3543
ec98f782
AG		 3544out:
3545 while (i >= 0) {
3546 __free_page(sg_page(&cmd->t_data_sg[i]));
3547 i--;
c66ac9db 3548 }
ec98f782
AG		 3549 kfree(cmd->t_data_sg);
3550 cmd->t_data_sg = NULL;
3551 return -ENOMEM;
c66ac9db
NB		 3552}
3553
a1d8b49a
AG		 3554/* Reduce sectors if they are too long for the device */
3555static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3556 struct se_device *dev,
3557 unsigned long long lba,
a1d8b49a 3558 sector_t sectors)
c66ac9db 3559{
a1d8b49a 3560 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3561
a1d8b49a
AG		 3562 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3563 if ((lba + sectors) > transport_dev_end_lba(dev))
3564 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3565
a1d8b49a 3566 return sectors;
c66ac9db
NB		 3567}
3568
c66ac9db
NB		 3569
3570/*
3571 * This function can be used by HW target mode drivers to create a linked
3572 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3573 * This is intended to be called during the completion path by TCM Core
3574 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3575 */
3576void transport_do_task_sg_chain(struct se_cmd *cmd)
3577{
ec98f782
AG		 3578 struct scatterlist *sg_first = NULL;
3579 struct scatterlist *sg_prev = NULL;
3580 int sg_prev_nents = 0;
3581 struct scatterlist *sg;
c66ac9db 3582 struct se_task *task;
ec98f782 3583 u32 chained_nents = 0;
c66ac9db
NB		 3584 int i;
3585
ec98f782
AG		 3586 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3587
c66ac9db
NB		 3588 /*
3589 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3590 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3591 */
a1d8b49a 3592 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3593 if (!task->task_sg)
c66ac9db
NB		 3594 continue;
3595
ec98f782
AG		 3596 if (!sg_first) {
3597 sg_first = task->task_sg;
6708bb27 3598 chained_nents = task->task_sg_nents;
97868c89 3599 } else {
ec98f782 3600 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3601 chained_nents += task->task_sg_nents;
97868c89 3602 }
c3c74c7a
NB		 3603 /*
3604 * For the padded tasks, use the extra SGL vector allocated
3605 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3606 * offset into sg_chain() above.
3607 *
3608 * We do not need the padding for the last task (or a single
3609 * task), but in that case we will never use the sg_prev_nents
3610 * value below which would be incorrect.
c3c74c7a 3611 */
04629b7b 3612 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3613 sg_prev = task->task_sg;
c66ac9db
NB		 3614 }
3615 /*
3616 * Setup the starting pointer and total t_tasks_sg_linked_no including
3617 * padding SGs for linking and to mark the end.
3618 */
a1d8b49a 3619 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3620 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3621
6708bb27 3622 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3623 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3624 cmd->t_tasks_sg_chained_no);
c66ac9db 3625
a1d8b49a
AG		 3626 for_each_sg(cmd->t_tasks_sg_chained, sg,
3627 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3628
6708bb27 3629 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3630 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3631 if (sg_is_chain(sg))
6708bb27 3632 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3633 if (sg_is_last(sg))
6708bb27 3634 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3635 }
c66ac9db
NB		 3636}
3637EXPORT_SYMBOL(transport_do_task_sg_chain);
3638
a1d8b49a
AG		 3639/*
3640 * Break up cmd into chunks transport can handle
3641 */
38b40067
CH		 3642static int
3643transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3644 enum dma_data_direction data_direction,
38b40067 3645 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3646{
5951146d 3647 struct se_device *dev = cmd->se_dev;
a3eedc22 3648 int task_count, i;
38b40067
CH		 3649 unsigned long long lba;
3650 sector_t sectors, dev_max_sectors;
3651 u32 sector_size;
3652
3653 if (transport_cmd_get_valid_sectors(cmd) < 0)
3654 return -EINVAL;
3655
3656 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3657 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
a1d8b49a 3658
ec98f782 3659 WARN_ON(cmd->data_length % sector_size);
38b40067
CH		 3660
3661 lba = cmd->t_task_lba;
ec98f782 3662 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27 3663 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
af3f00c7
CH		 3664
3665 /*
3666 * If we need just a single task reuse the SG list in the command
3667 * and avoid a lot of work.
3668 */
3669 if (task_count == 1) {
3670 struct se_task *task;
3671 unsigned long flags;
3672
3673 task = transport_generic_get_task(cmd, data_direction);
3674 if (!task)
3675 return -ENOMEM;
3676
3677 task->task_sg = cmd_sg;
3678 task->task_sg_nents = sgl_nents;
3679
3680 task->task_lba = lba;
3681 task->task_sectors = sectors;
3682 task->task_size = task->task_sectors * sector_size;
3683
3684 spin_lock_irqsave(&cmd->t_state_lock, flags);
3685 list_add_tail(&task->t_list, &cmd->t_task_list);
3686 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3687
3688 return task_count;
3689 }
3690
ec98f782 3691 for (i = 0; i < task_count; i++) {
38b40067 3692 struct se_task *task;
c3c74c7a 3693 unsigned int task_size, task_sg_nents_padded;
38b40067
CH		 3694 struct scatterlist *sg;
3695 unsigned long flags;
ec98f782 3696 int count;
a1d8b49a 3697
c66ac9db 3698 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3699 if (!task)
ec98f782 3700 return -ENOMEM;
c66ac9db 3701
c66ac9db 3702 task->task_lba = lba;
ec98f782
AG		 3703 task->task_sectors = min(sectors, dev_max_sectors);
3704 task->task_size = task->task_sectors * sector_size;
c66ac9db 3705
525a48a2
NB		 3706 /*
3707 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3708 * in order to calculate the number per task SGL entries
3709 */
3710 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3711 /*
ec98f782
AG		 3712 * Check if the fabric module driver is requesting that all
3713 * struct se_task->task_sg[] be chained together.. If so,
3714 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3715 * marking the end of the chained SGL for every task except
3716 * the last one for (task_count > 1) operation, or skipping
3717 * the extra padding for the (task_count == 1) case.
c66ac9db 3718 */
c3c74c7a
NB		 3719 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3720 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3721 } else
3722 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3723
1d20bb61 3724 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3725 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3726 if (!task->task_sg) {
3727 cmd->se_dev->transport->free_task(task);
3728 return -ENOMEM;
3729 }
3730
c3c74c7a 3731 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3732
ec98f782
AG		 3733 task_size = task->task_size;
3734
3735 /* Build new sgl, only up to task_size */
6708bb27 3736 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3737 if (cmd_sg->length > task_size)
3738 break;
3739
3740 *sg = *cmd_sg;
3741 task_size -= cmd_sg->length;
3742 cmd_sg = sg_next(cmd_sg);
c66ac9db 3743 }
c66ac9db 3744
ec98f782
AG		 3745 lba += task->task_sectors;
3746 sectors -= task->task_sectors;
c66ac9db 3747
ec98f782
AG		 3748 spin_lock_irqsave(&cmd->t_state_lock, flags);
3749 list_add_tail(&task->t_list, &cmd->t_task_list);
3750 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3751 }
3752
ec98f782 3753 return task_count;
c66ac9db
NB		 3754}
3755
3756static int
ec98f782 3757transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3758{
c66ac9db 3759 struct se_task *task;
ec98f782 3760 unsigned long flags;
c66ac9db
NB		 3761
3762 task = transport_generic_get_task(cmd, cmd->data_direction);
3763 if (!task)
ec98f782 3764 return -ENOMEM;
c66ac9db 3765
af3f00c7 3766 task->task_sg = cmd->t_data_sg;
c66ac9db 3767 task->task_size = cmd->data_length;
6708bb27 3768 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3769
ec98f782
AG		 3770 spin_lock_irqsave(&cmd->t_state_lock, flags);
3771 list_add_tail(&task->t_list, &cmd->t_task_list);
3772 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3773
6708bb27 3774 /* Success! Return number of tasks allocated */
a3eedc22 3775 return 1;
ec98f782
AG		 3776}
3777
da0f7619
CH		 3778/*
3779 * Allocate any required ressources to execute the command, and either place
3780 * it on the execution queue if possible. For writes we might not have the
3781 * payload yet, thus notify the fabric via a call to ->write_pending instead.
c66ac9db 3782 */
a1d8b49a 3783int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3784{
da0f7619 3785 struct se_device *dev = cmd->se_dev;
9ac54987 3786 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3787 int set_counts = 1;
c66ac9db
NB		 3788 int ret = 0;
3789
3790 /*
3791 * Determine is the TCM fabric module has already allocated physical
3792 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3793 * beforehand.
c66ac9db 3794 */
ec98f782
AG		 3795 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3796 cmd->data_length) {
05d1c7c0 3797 ret = transport_generic_get_mem(cmd);
c66ac9db 3798 if (ret < 0)
03e98c9e 3799 goto out_fail;
c66ac9db 3800 }
da0f7619 3801
1d20bb61 3802 /*
38b40067 3803 * For BIDI command set up the read tasks first.
1d20bb61 3804 */
da0f7619 3805 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3806 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3807 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3808
9ac54987
NB		 3809 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3810 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3811 cmd->t_bidi_data_nents);
3812 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3813 goto out_fail;
3814
3815 atomic_inc(&cmd->t_fe_count);
3816 atomic_inc(&cmd->t_se_count);
3817 set_counts = 0;
3818 }
38b40067
CH		 3819
3820 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3821 task_cdbs = transport_allocate_data_tasks(cmd,
3822 cmd->data_direction, cmd->t_data_sg,
3823 cmd->t_data_nents);
3824 } else {
3825 task_cdbs = transport_allocate_control_task(cmd);
3826 }
3827
410f6702 3828 if (task_cdbs < 0)
da0f7619 3829 goto out_fail;
410f6702
RD		 3830 else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3831 cmd->t_state = TRANSPORT_COMPLETE;
3832 atomic_set(&cmd->t_transport_active, 1);
3833 INIT_WORK(&cmd->work, target_complete_ok_work);
3834 queue_work(target_completion_wq, &cmd->work);
3835 return 0;
3836 }
da0f7619
CH		 3837
3838 if (set_counts) {
3839 atomic_inc(&cmd->t_fe_count);
3840 atomic_inc(&cmd->t_se_count);
3841 }
3842
9ac54987
NB		 3843 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3844 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3845 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3846
c66ac9db 3847 /*
a1d8b49a 3848 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3849 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3850 * will be added to the struct se_device execution queue after its WRITE
3851 * data has arrived. (ie: It gets handled by the transport processing
3852 * thread a second time)
3853 */
3854 if (cmd->data_direction == DMA_TO_DEVICE) {
3855 transport_add_tasks_to_state_queue(cmd);
3856 return transport_generic_write_pending(cmd);
3857 }
3858 /*
3859 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3860 * to the execution queue.
3861 */
3862 transport_execute_tasks(cmd);
3863 return 0;
da0f7619
CH		 3864
3865out_fail:
3866 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3867 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3868 return -EINVAL;
c66ac9db 3869}
a1d8b49a 3870EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3871
3872/* transport_generic_process_write():
3873 *
3874 *
3875 */
3876void transport_generic_process_write(struct se_cmd *cmd)
3877{
c66ac9db
NB		 3878 transport_execute_tasks(cmd);
3879}
3880EXPORT_SYMBOL(transport_generic_process_write);
3881
e057f533 3882static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3883{
f147abb4
NB		 3884 int ret;
3885
3886 ret = cmd->se_tfo->write_pending(cmd);
3887 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3888 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3889 cmd);
3890 transport_handle_queue_full(cmd, cmd->se_dev);
3891 }
07bde79a
NB		 3892}
3893
c66ac9db
NB		 3894static int transport_generic_write_pending(struct se_cmd *cmd)
3895{
3896 unsigned long flags;
3897 int ret;
3898
a1d8b49a 3899 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3900 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3901 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3902
c66ac9db
NB		 3903 /*
3904 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 3905 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 3906 * can be called from HW target mode interrupt code. This is safe
e3d6f909 3907 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3908 * because the se_cmd->se_lun pointer is not being cleared.
3909 */
3910 transport_cmd_check_stop(cmd, 1, 0);
3911
3912 /*
3913 * Call the fabric write_pending function here to let the
3914 * frontend know that WRITE buffers are ready.
3915 */
e3d6f909 3916 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3917 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3918 goto queue_full;
3919 else if (ret < 0)
c66ac9db
NB		 3920 return ret;
3921
03e98c9e 3922 return 1;
07bde79a
NB		 3923
3924queue_full:
6708bb27 3925 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3926 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3927 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3928 return 0;
c66ac9db
NB		 3929}
3930
39c05f32 3931void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3932{
d14921d6
NB		 3933 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3934 if (wait_for_tasks && cmd->se_tmr_req)
3935 transport_wait_for_tasks(cmd);
3936
35462975 3937 transport_release_cmd(cmd);
d14921d6
NB		 3938 } else {
3939 if (wait_for_tasks)
3940 transport_wait_for_tasks(cmd);
3941
c66ac9db
NB		 3942 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3943
82f1c8a4 3944 if (cmd->se_lun)
c66ac9db 3945 transport_lun_remove_cmd(cmd);
c66ac9db 3946
f4366772
NB		 3947 transport_free_dev_tasks(cmd);
3948
39c05f32 3949 transport_put_cmd(cmd);
c66ac9db
NB		 3950 }
3951}
3952EXPORT_SYMBOL(transport_generic_free_cmd);
3953
a17f091d
NB		 3954/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3955 * @se_sess: session to reference
3956 * @se_cmd: command descriptor to add
a6360785 3957 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 3958 */
a6360785
NB		 3959void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3960 bool ack_kref)
a17f091d
NB		 3961{
3962 unsigned long flags;
3963
7481deb4 3964 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 3965 /*
3966 * Add a second kref if the fabric caller is expecting to handle
3967 * fabric acknowledgement that requires two target_put_sess_cmd()
3968 * invocations before se_cmd descriptor release.
3969 */
3970 if (ack_kref == true)
3971 kref_get(&se_cmd->cmd_kref);
7481deb4 3972
a17f091d
NB		 3973 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3974 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3975 se_cmd->check_release = 1;
3976 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3977}
3978EXPORT_SYMBOL(target_get_sess_cmd);
3979
7481deb4 3980static void target_release_cmd_kref(struct kref *kref)
a17f091d 3981{
7481deb4
NB		 3982 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3983 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 3984 unsigned long flags;
3985
3986 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3987 if (list_empty(&se_cmd->se_cmd_list)) {
3988 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3989 WARN_ON(1);
7481deb4 3990 return;
a17f091d 3991 }
a17f091d
NB		 3992 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3993 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3994 complete(&se_cmd->cmd_wait_comp);
7481deb4 3995 return;
a17f091d
NB		 3996 }
3997 list_del(&se_cmd->se_cmd_list);
3998 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3999
7481deb4
NB		 4000 se_cmd->se_tfo->release_cmd(se_cmd);
4001}
4002
4003/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4004 * @se_sess: session to reference
4005 * @se_cmd: command descriptor to drop
4006 */
4007int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4008{
4009 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 4010}
4011EXPORT_SYMBOL(target_put_sess_cmd);
4012
4013/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4014 * @se_sess: session to split
4015 */
4016void target_splice_sess_cmd_list(struct se_session *se_sess)
4017{
4018 struct se_cmd *se_cmd;
4019 unsigned long flags;
4020
4021 WARN_ON(!list_empty(&se_sess->sess_wait_list));
4022 INIT_LIST_HEAD(&se_sess->sess_wait_list);
4023
4024 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4025 se_sess->sess_tearing_down = 1;
4026
4027 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4028
4029 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4030 se_cmd->cmd_wait_set = 1;
4031
4032 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4033}
4034EXPORT_SYMBOL(target_splice_sess_cmd_list);
4035
4036/* target_wait_for_sess_cmds - Wait for outstanding descriptors
4037 * @se_sess: session to wait for active I/O
4038 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4039 */
4040void target_wait_for_sess_cmds(
4041 struct se_session *se_sess,
4042 int wait_for_tasks)
4043{
4044 struct se_cmd *se_cmd, *tmp_cmd;
4045 bool rc = false;
4046
4047 list_for_each_entry_safe(se_cmd, tmp_cmd,
4048 &se_sess->sess_wait_list, se_cmd_list) {
4049 list_del(&se_cmd->se_cmd_list);
4050
4051 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4052 " %d\n", se_cmd, se_cmd->t_state,
4053 se_cmd->se_tfo->get_cmd_state(se_cmd));
4054
4055 if (wait_for_tasks) {
4056 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4057 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4058 se_cmd->se_tfo->get_cmd_state(se_cmd));
4059
4060 rc = transport_wait_for_tasks(se_cmd);
4061
4062 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4063 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4064 se_cmd->se_tfo->get_cmd_state(se_cmd));
4065 }
4066
4067 if (!rc) {
4068 wait_for_completion(&se_cmd->cmd_wait_comp);
4069 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4070 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4071 se_cmd->se_tfo->get_cmd_state(se_cmd));
4072 }
4073
4074 se_cmd->se_tfo->release_cmd(se_cmd);
4075 }
4076}
4077EXPORT_SYMBOL(target_wait_for_sess_cmds);
4078
c66ac9db
NB		 4079/* transport_lun_wait_for_tasks():
4080 *
4081 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4082 * an struct se_lun to be successfully shutdown.
4083 */
4084static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4085{
4086 unsigned long flags;
4087 int ret;
4088 /*
4089 * If the frontend has already requested this struct se_cmd to
4090 * be stopped, we can safely ignore this struct se_cmd.
4091 */
a1d8b49a
AG		 4092 spin_lock_irqsave(&cmd->t_state_lock, flags);
4093 if (atomic_read(&cmd->t_transport_stop)) {
4094 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4095 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4096 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4097 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4098 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4099 return -EPERM;
c66ac9db 4100 }
a1d8b49a
AG		 4101 atomic_set(&cmd->transport_lun_fe_stop, 1);
4102 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4103
5951146d 4104 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4105
4106 ret = transport_stop_tasks_for_cmd(cmd);
4107
6708bb27
AG		 4108 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4109 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4110 if (!ret) {
6708bb27 4111 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4112 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4113 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4114 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4115 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4116 }
3df8d40b 4117 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4118
4119 return 0;
4120}
4121
c66ac9db
NB		 4122static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4123{
4124 struct se_cmd *cmd = NULL;
4125 unsigned long lun_flags, cmd_flags;
4126 /*
4127 * Do exception processing and return CHECK_CONDITION status to the
4128 * Initiator Port.
4129 */
4130 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4131 while (!list_empty(&lun->lun_cmd_list)) {
4132 cmd = list_first_entry(&lun->lun_cmd_list,
4133 struct se_cmd, se_lun_node);
4134 list_del(&cmd->se_lun_node);
4135
a1d8b49a 4136 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4137 /*
4138 * This will notify iscsi_target_transport.c:
4139 * transport_cmd_check_stop() that a LUN shutdown is in
4140 * progress for the iscsi_cmd_t.
4141 */
a1d8b49a 4142 spin_lock(&cmd->t_state_lock);
6708bb27 4143 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4144 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4145 cmd->se_lun->unpacked_lun,
4146 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4147 atomic_set(&cmd->transport_lun_stop, 1);
4148 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4149
4150 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4151
6708bb27
AG		 4152 if (!cmd->se_lun) {
4153 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4154 cmd->se_tfo->get_task_tag(cmd),
4155 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4156 BUG();
4157 }
4158 /*
4159 * If the Storage engine still owns the iscsi_cmd_t, determine
4160 * and/or stop its context.
4161 */
6708bb27 4162 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4163 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4164 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4165
e3d6f909 4166 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4167 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4168 continue;
4169 }
4170
6708bb27 4171 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4172 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4173 cmd->se_lun->unpacked_lun,
4174 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4175
a1d8b49a 4176 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4177 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4178 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4179 goto check_cond;
4180 }
a1d8b49a 4181 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4182 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4183 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4184
4185 transport_free_dev_tasks(cmd);
4186 /*
4187 * The Storage engine stopped this struct se_cmd before it was
4188 * send to the fabric frontend for delivery back to the
4189 * Initiator Node. Return this SCSI CDB back with an
4190 * CHECK_CONDITION status.
4191 */
4192check_cond:
4193 transport_send_check_condition_and_sense(cmd,
4194 TCM_NON_EXISTENT_LUN, 0);
4195 /*
4196 * If the fabric frontend is waiting for this iscsi_cmd_t to
4197 * be released, notify the waiting thread now that LU has
4198 * finished accessing it.
4199 */
a1d8b49a
AG		 4200 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4201 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4202 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4203 " struct se_cmd: %p ITT: 0x%08x\n",
4204 lun->unpacked_lun,
e3d6f909 4205 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4206
a1d8b49a 4207 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4208 cmd_flags);
4209 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4210 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4211 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4212 continue;
4213 }
6708bb27 4214 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4215 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4216
a1d8b49a 4217 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4218 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4219 }
4220 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4221}
4222
4223static int transport_clear_lun_thread(void *p)
4224{
8359cf43 4225 struct se_lun *lun = p;
c66ac9db
NB		 4226
4227 __transport_clear_lun_from_sessions(lun);
4228 complete(&lun->lun_shutdown_comp);
4229
4230 return 0;
4231}
4232
4233int transport_clear_lun_from_sessions(struct se_lun *lun)
4234{
4235 struct task_struct *kt;
4236
5951146d 4237 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4238 "tcm_cl_%u", lun->unpacked_lun);
4239 if (IS_ERR(kt)) {
6708bb27 4240 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4241 return PTR_ERR(kt);
c66ac9db
NB		 4242 }
4243 wait_for_completion(&lun->lun_shutdown_comp);
4244
4245 return 0;
4246}
4247
d14921d6
NB		 4248/**
4249 * transport_wait_for_tasks - wait for completion to occur
4250 * @cmd: command to wait
c66ac9db 4251 *
d14921d6
NB		 4252 * Called from frontend fabric context to wait for storage engine
4253 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4254 */
a17f091d 4255bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4256{
4257 unsigned long flags;
4258
a1d8b49a 4259 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4260 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4261 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4262 return false;
d14921d6
NB		 4263 }
4264 /*
4265 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4266 * has been set in transport_set_supported_SAM_opcode().
4267 */
4268 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4269 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4270 return false;
d14921d6 4271 }
c66ac9db
NB		 4272 /*
4273 * If we are already stopped due to an external event (ie: LUN shutdown)
4274 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4275 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4276 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4277 * has completed its operation on the struct se_cmd.
4278 */
a1d8b49a 4279 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4280
6708bb27 4281 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4282 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4283 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4284 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4285 /*
4286 * There is a special case for WRITES where a FE exception +
4287 * LUN shutdown means ConfigFS context is still sleeping on
4288 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4289 * We go ahead and up transport_lun_stop_comp just to be sure
4290 * here.
4291 */
a1d8b49a
AG		 4292 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4293 complete(&cmd->transport_lun_stop_comp);
4294 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4295 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4296
4297 transport_all_task_dev_remove_state(cmd);
4298 /*
4299 * At this point, the frontend who was the originator of this
4300 * struct se_cmd, now owns the structure and can be released through
4301 * normal means below.
4302 */
6708bb27 4303 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4304 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4305 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4306 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4307
a1d8b49a 4308 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4309 }
a1d8b49a 4310 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4311 atomic_read(&cmd->t_transport_aborted)) {
4312 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4313 return false;
d14921d6 4314 }
c66ac9db 4315
a1d8b49a 4316 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4317
6708bb27 4318 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
f2da9dbd
CH		 4319 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4320 cmd, cmd->se_tfo->get_task_tag(cmd),
4321 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4322
a1d8b49a 4323 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4324
5951146d 4325 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4326
a1d8b49a 4327 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4328
a1d8b49a
AG		 4329 spin_lock_irqsave(&cmd->t_state_lock, flags);
4330 atomic_set(&cmd->t_transport_active, 0);
4331 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4332
6708bb27 4333 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4334 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4335 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4336
d14921d6 4337 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4338
4339 return true;
c66ac9db 4340}
d14921d6 4341EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4342
4343static int transport_get_sense_codes(
4344 struct se_cmd *cmd,
4345 u8 *asc,
4346 u8 *ascq)
4347{
4348 *asc = cmd->scsi_asc;
4349 *ascq = cmd->scsi_ascq;
4350
4351 return 0;
4352}
4353
4354static int transport_set_sense_codes(
4355 struct se_cmd *cmd,
4356 u8 asc,
4357 u8 ascq)
4358{
4359 cmd->scsi_asc = asc;
4360 cmd->scsi_ascq = ascq;
4361
4362 return 0;
4363}
4364
4365int transport_send_check_condition_and_sense(
4366 struct se_cmd *cmd,
4367 u8 reason,
4368 int from_transport)
4369{
4370 unsigned char *buffer = cmd->sense_buffer;
4371 unsigned long flags;
4372 int offset;
4373 u8 asc = 0, ascq = 0;
4374
a1d8b49a 4375 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4376 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4377 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4378 return 0;
4379 }
4380 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4381 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4382
4383 if (!reason && from_transport)
4384 goto after_reason;
4385
4386 if (!from_transport)
4387 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4388 /*
4389 * Data Segment and SenseLength of the fabric response PDU.
4390 *
4391 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4392 * from include/scsi/scsi_cmnd.h
4393 */
e3d6f909 4394 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4395 TRANSPORT_SENSE_BUFFER);
4396 /*
4397 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4398 * SENSE KEY values from include/scsi/scsi.h
4399 */
4400 switch (reason) {
4401 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4402 /* CURRENT ERROR */
4403 buffer[offset] = 0x70;
895f3022 4404 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 4405 /* ILLEGAL REQUEST */
4406 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4407 /* LOGICAL UNIT NOT SUPPORTED */
4408 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4409 break;
c66ac9db
NB		 4410 case TCM_UNSUPPORTED_SCSI_OPCODE:
4411 case TCM_SECTOR_COUNT_TOO_MANY:
4412 /* CURRENT ERROR */
4413 buffer[offset] = 0x70;
895f3022 4414 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4415 /* ILLEGAL REQUEST */
4416 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4417 /* INVALID COMMAND OPERATION CODE */
4418 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4419 break;
4420 case TCM_UNKNOWN_MODE_PAGE:
4421 /* CURRENT ERROR */
4422 buffer[offset] = 0x70;
895f3022 4423 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4424 /* ILLEGAL REQUEST */
4425 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4426 /* INVALID FIELD IN CDB */
4427 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4428 break;
4429 case TCM_CHECK_CONDITION_ABORT_CMD:
4430 /* CURRENT ERROR */
4431 buffer[offset] = 0x70;
895f3022 4432 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4433 /* ABORTED COMMAND */
4434 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4435 /* BUS DEVICE RESET FUNCTION OCCURRED */
4436 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4437 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4438 break;
4439 case TCM_INCORRECT_AMOUNT_OF_DATA:
4440 /* CURRENT ERROR */
4441 buffer[offset] = 0x70;
895f3022 4442 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4443 /* ABORTED COMMAND */
4444 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4445 /* WRITE ERROR */
4446 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4447 /* NOT ENOUGH UNSOLICITED DATA */
4448 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4449 break;
4450 case TCM_INVALID_CDB_FIELD:
4451 /* CURRENT ERROR */
4452 buffer[offset] = 0x70;
895f3022 4453 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4454 /* ILLEGAL REQUEST */
4455 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4456 /* INVALID FIELD IN CDB */
4457 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4458 break;
4459 case TCM_INVALID_PARAMETER_LIST:
4460 /* CURRENT ERROR */
4461 buffer[offset] = 0x70;
895f3022 4462 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4463 /* ILLEGAL REQUEST */
4464 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4465 /* INVALID FIELD IN PARAMETER LIST */
4466 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4467 break;
4468 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4469 /* CURRENT ERROR */
4470 buffer[offset] = 0x70;
895f3022 4471 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4472 /* ABORTED COMMAND */
4473 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4474 /* WRITE ERROR */
4475 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4476 /* UNEXPECTED_UNSOLICITED_DATA */
4477 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4478 break;
4479 case TCM_SERVICE_CRC_ERROR:
4480 /* CURRENT ERROR */
4481 buffer[offset] = 0x70;
895f3022 4482 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4483 /* ABORTED COMMAND */
4484 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4485 /* PROTOCOL SERVICE CRC ERROR */
4486 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4487 /* N/A */
4488 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4489 break;
4490 case TCM_SNACK_REJECTED:
4491 /* CURRENT ERROR */
4492 buffer[offset] = 0x70;
895f3022 4493 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4494 /* ABORTED COMMAND */
4495 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4496 /* READ ERROR */
4497 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4498 /* FAILED RETRANSMISSION REQUEST */
4499 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4500 break;
4501 case TCM_WRITE_PROTECTED:
4502 /* CURRENT ERROR */
4503 buffer[offset] = 0x70;
895f3022 4504 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4505 /* DATA PROTECT */
4506 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4507 /* WRITE PROTECTED */
4508 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4509 break;
4510 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4511 /* CURRENT ERROR */
4512 buffer[offset] = 0x70;
895f3022 4513 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4514 /* UNIT ATTENTION */
4515 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4516 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4517 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4518 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4519 break;
4520 case TCM_CHECK_CONDITION_NOT_READY:
4521 /* CURRENT ERROR */
4522 buffer[offset] = 0x70;
895f3022 4523 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4524 /* Not Ready */
4525 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4526 transport_get_sense_codes(cmd, &asc, &ascq);
4527 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4528 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4529 break;
4530 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4531 default:
4532 /* CURRENT ERROR */
4533 buffer[offset] = 0x70;
895f3022 4534 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4535 /* ILLEGAL REQUEST */
4536 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4537 /* LOGICAL UNIT COMMUNICATION FAILURE */
4538 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4539 break;
4540 }
4541 /*
4542 * This code uses linux/include/scsi/scsi.h SAM status codes!
4543 */
4544 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4545 /*
4546 * Automatically padded, this value is encoded in the fabric's
4547 * data_length response PDU containing the SCSI defined sense data.
4548 */
4549 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4550
4551after_reason:
07bde79a 4552 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4553}
4554EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4555
4556int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4557{
4558 int ret = 0;
4559
a1d8b49a 4560 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4561 if (!send_status ||
c66ac9db
NB		 4562 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4563 return 1;
4564#if 0
6708bb27 4565 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4566 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4567 cmd->t_task_cdb[0],
e3d6f909 4568 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4569#endif
4570 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4571 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4572 ret = 1;
4573 }
4574 return ret;
4575}
4576EXPORT_SYMBOL(transport_check_aborted_status);
4577
4578void transport_send_task_abort(struct se_cmd *cmd)
4579{
c252f003
NB		 4580 unsigned long flags;
4581
4582 spin_lock_irqsave(&cmd->t_state_lock, flags);
4583 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4584 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4585 return;
4586 }
4587 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4588
c66ac9db
NB		 4589 /*
4590 * If there are still expected incoming fabric WRITEs, we wait
4591 * until until they have completed before sending a TASK_ABORTED
4592 * response. This response with TASK_ABORTED status will be
4593 * queued back to fabric module by transport_check_aborted_status().
4594 */
4595 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4596 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4597 atomic_inc(&cmd->t_transport_aborted);
c66ac9db 4598 smp_mb__after_atomic_inc();
c66ac9db
NB		 4599 }
4600 }
4601 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4602#if 0
6708bb27 4603 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4604 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4605 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4606#endif
e3d6f909 4607 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4608}
4609
e26d99ae 4610static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4611{
5951146d 4612 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4613 struct se_tmr_req *tmr = cmd->se_tmr_req;
4614 int ret;
4615
4616 switch (tmr->function) {
5c6cd613 4617 case TMR_ABORT_TASK:
c66ac9db
NB		 4618 tmr->response = TMR_FUNCTION_REJECTED;
4619 break;
5c6cd613
NB		 4620 case TMR_ABORT_TASK_SET:
4621 case TMR_CLEAR_ACA:
4622 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4623 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4624 break;
5c6cd613 4625 case TMR_LUN_RESET:
c66ac9db
NB		 4626 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4627 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4628 TMR_FUNCTION_REJECTED;
4629 break;
5c6cd613 4630 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4631 tmr->response = TMR_FUNCTION_REJECTED;
4632 break;
5c6cd613 4633 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4634 tmr->response = TMR_FUNCTION_REJECTED;
4635 break;
c66ac9db 4636 default:
6708bb27 4637 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4638 tmr->function);
4639 tmr->response = TMR_FUNCTION_REJECTED;
4640 break;
4641 }
4642
4643 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4644 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4645
b7b8bef7 4646 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4647 return 0;
4648}
4649
c66ac9db
NB		 4650/* transport_processing_thread():
4651 *
4652 *
4653 */
4654static int transport_processing_thread(void *param)
4655{
5951146d 4656 int ret;
c66ac9db 4657 struct se_cmd *cmd;
8359cf43 4658 struct se_device *dev = param;
c66ac9db 4659
c66ac9db 4660 while (!kthread_should_stop()) {
e3d6f909
AG		 4661 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4662 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4663 kthread_should_stop());
4664 if (ret < 0)
4665 goto out;
4666
c66ac9db 4667get_cmd:
5951146d
AG		 4668 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4669 if (!cmd)
c66ac9db
NB		 4670 continue;
4671
5951146d 4672 switch (cmd->t_state) {
680b73c5
CH		 4673 case TRANSPORT_NEW_CMD:
4674 BUG();
4675 break;
c66ac9db 4676 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4677 if (!cmd->se_tfo->new_cmd_map) {
4678 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4679 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4680 BUG();
4681 }
e3d6f909 4682 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4683 if (ret < 0) {
03e98c9e 4684 transport_generic_request_failure(cmd);
c66ac9db
NB		 4685 break;
4686 }
c66ac9db 4687 ret = transport_generic_new_cmd(cmd);
f147abb4 4688 if (ret < 0) {
03e98c9e
NB		 4689 transport_generic_request_failure(cmd);
4690 break;
c66ac9db
NB		 4691 }
4692 break;
4693 case TRANSPORT_PROCESS_WRITE:
4694 transport_generic_process_write(cmd);
4695 break;
c66ac9db
NB		 4696 case TRANSPORT_PROCESS_TMR:
4697 transport_generic_do_tmr(cmd);
4698 break;
07bde79a 4699 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4700 transport_write_pending_qf(cmd);
4701 break;
4702 case TRANSPORT_COMPLETE_QF_OK:
4703 transport_complete_qf(cmd);
07bde79a 4704 break;
c66ac9db 4705 default:
f2da9dbd
CH		 4706 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4707 "i_state: %d on SE LUN: %u\n",
4708 cmd->t_state,
e3d6f909
AG		 4709 cmd->se_tfo->get_task_tag(cmd),
4710 cmd->se_tfo->get_cmd_state(cmd),
4711 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4712 BUG();
4713 }
4714
4715 goto get_cmd;
4716 }
4717
4718out:
ce8762f6
NB		 4719 WARN_ON(!list_empty(&dev->state_task_list));
4720 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4721 dev->process_thread = NULL;
4722 return 0;
4723}
Linux 6.x block layer and io_uring tree(s)