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target: Fix possible NULL pointer with __transport_execute_tasks
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
c66ac9db
NB		 40#include <asm/unaligned.h>
41#include <net/sock.h>
42#include <net/tcp.h>
43#include <scsi/scsi.h>
44#include <scsi/scsi_cmnd.h>
e66ecd50 45#include <scsi/scsi_tcq.h>
c66ac9db
NB		 46
47#include <target/target_core_base.h>
c4795fb2
CH		 48#include <target/target_core_backend.h>
49#include <target/target_core_fabric.h>
c66ac9db
NB		 50#include <target/target_core_configfs.h>
51
e26d99ae 52#include "target_core_internal.h"
c66ac9db 53#include "target_core_alua.h"
c66ac9db 54#include "target_core_pr.h"
c66ac9db
NB		 55#include "target_core_ua.h"
56
e3d6f909 57static int sub_api_initialized;
c66ac9db 58
35e0e757 59static struct workqueue_struct *target_completion_wq;
c66ac9db
NB		 60static struct kmem_cache *se_sess_cache;
61struct kmem_cache *se_tmr_req_cache;
62struct kmem_cache *se_ua_cache;
c66ac9db
NB		 63struct kmem_cache *t10_pr_reg_cache;
64struct kmem_cache *t10_alua_lu_gp_cache;
65struct kmem_cache *t10_alua_lu_gp_mem_cache;
66struct kmem_cache *t10_alua_tg_pt_gp_cache;
67struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
68
c66ac9db 69static int transport_generic_write_pending(struct se_cmd *);
5951146d 70static int transport_processing_thread(void *param);
c66ac9db
NB		 71static int __transport_execute_tasks(struct se_device *dev);
72static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 73static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 74 struct se_device *dev);
c66ac9db 75static void transport_free_dev_tasks(struct se_cmd *cmd);
05d1c7c0 76static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 77static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 78static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 79static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
03e98c9e 80static void transport_generic_request_failure(struct se_cmd *);
35e0e757 81static void target_complete_ok_work(struct work_struct *work);
c66ac9db 82
e3d6f909 83int init_se_kmem_caches(void)
c66ac9db 84{
c66ac9db
NB		 85 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
86 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
87 0, NULL);
6708bb27
AG		 88 if (!se_tmr_req_cache) {
89 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db 90 " failed\n");
97c34f3b 91 goto out;
c66ac9db
NB		 92 }
93 se_sess_cache = kmem_cache_create("se_sess_cache",
94 sizeof(struct se_session), __alignof__(struct se_session),
95 0, NULL);
6708bb27
AG		 96 if (!se_sess_cache) {
97 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 98 " failed\n");
35e0e757 99 goto out_free_tmr_req_cache;
c66ac9db
NB		 100 }
101 se_ua_cache = kmem_cache_create("se_ua_cache",
102 sizeof(struct se_ua), __alignof__(struct se_ua),
103 0, NULL);
6708bb27
AG		 104 if (!se_ua_cache) {
105 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 106 goto out_free_sess_cache;
c66ac9db 107 }
c66ac9db
NB		 108 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
109 sizeof(struct t10_pr_registration),
110 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 111 if (!t10_pr_reg_cache) {
112 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 113 " failed\n");
35e0e757 114 goto out_free_ua_cache;
c66ac9db
NB		 115 }
116 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
117 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
118 0, NULL);
6708bb27
AG		 119 if (!t10_alua_lu_gp_cache) {
120 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 121 " failed\n");
35e0e757 122 goto out_free_pr_reg_cache;
c66ac9db
NB		 123 }
124 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
125 sizeof(struct t10_alua_lu_gp_member),
126 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 127 if (!t10_alua_lu_gp_mem_cache) {
128 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 129 "cache failed\n");
35e0e757 130 goto out_free_lu_gp_cache;
c66ac9db
NB		 131 }
132 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
133 sizeof(struct t10_alua_tg_pt_gp),
134 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 135 if (!t10_alua_tg_pt_gp_cache) {
136 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 137 "cache failed\n");
35e0e757 138 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 139 }
140 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
141 "t10_alua_tg_pt_gp_mem_cache",
142 sizeof(struct t10_alua_tg_pt_gp_member),
143 __alignof__(struct t10_alua_tg_pt_gp_member),
144 0, NULL);
6708bb27
AG		 145 if (!t10_alua_tg_pt_gp_mem_cache) {
146 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 147 "mem_t failed\n");
35e0e757 148 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 149 }
150
35e0e757
CH		 151 target_completion_wq = alloc_workqueue("target_completion",
152 WQ_MEM_RECLAIM, 0);
153 if (!target_completion_wq)
154 goto out_free_tg_pt_gp_mem_cache;
155
c66ac9db 156 return 0;
35e0e757
CH		 157
158out_free_tg_pt_gp_mem_cache:
159 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
160out_free_tg_pt_gp_cache:
161 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
162out_free_lu_gp_mem_cache:
163 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
164out_free_lu_gp_cache:
165 kmem_cache_destroy(t10_alua_lu_gp_cache);
166out_free_pr_reg_cache:
167 kmem_cache_destroy(t10_pr_reg_cache);
168out_free_ua_cache:
169 kmem_cache_destroy(se_ua_cache);
170out_free_sess_cache:
171 kmem_cache_destroy(se_sess_cache);
172out_free_tmr_req_cache:
173 kmem_cache_destroy(se_tmr_req_cache);
c66ac9db 174out:
e3d6f909 175 return -ENOMEM;
c66ac9db
NB		 176}
177
e3d6f909 178void release_se_kmem_caches(void)
c66ac9db 179{
35e0e757 180 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 181 kmem_cache_destroy(se_tmr_req_cache);
182 kmem_cache_destroy(se_sess_cache);
183 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 184 kmem_cache_destroy(t10_pr_reg_cache);
185 kmem_cache_destroy(t10_alua_lu_gp_cache);
186 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
187 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
188 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 189}
190
e3d6f909
AG		 191/* This code ensures unique mib indexes are handed out. */
192static DEFINE_SPINLOCK(scsi_mib_index_lock);
193static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 194
195/*
196 * Allocate a new row index for the entry type specified
197 */
198u32 scsi_get_new_index(scsi_index_t type)
199{
200 u32 new_index;
201
e3d6f909 202 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 203
e3d6f909
AG		 204 spin_lock(&scsi_mib_index_lock);
205 new_index = ++scsi_mib_index[type];
206 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 207
208 return new_index;
209}
210
e26d99ae 211static void transport_init_queue_obj(struct se_queue_obj *qobj)
c66ac9db
NB		 212{
213 atomic_set(&qobj->queue_cnt, 0);
214 INIT_LIST_HEAD(&qobj->qobj_list);
215 init_waitqueue_head(&qobj->thread_wq);
216 spin_lock_init(&qobj->cmd_queue_lock);
217}
c66ac9db 218
dbc5623e 219void transport_subsystem_check_init(void)
c66ac9db
NB		 220{
221 int ret;
222
dbc5623e
NB		 223 if (sub_api_initialized)
224 return;
225
c66ac9db
NB		 226 ret = request_module("target_core_iblock");
227 if (ret != 0)
6708bb27 228 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 229
230 ret = request_module("target_core_file");
231 if (ret != 0)
6708bb27 232 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 233
234 ret = request_module("target_core_pscsi");
235 if (ret != 0)
6708bb27 236 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 237
238 ret = request_module("target_core_stgt");
239 if (ret != 0)
6708bb27 240 pr_err("Unable to load target_core_stgt\n");
c66ac9db 241
e3d6f909 242 sub_api_initialized = 1;
dbc5623e 243 return;
c66ac9db
NB		 244}
245
246struct se_session *transport_init_session(void)
247{
248 struct se_session *se_sess;
249
250 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 251 if (!se_sess) {
252 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 253 " se_sess_cache\n");
254 return ERR_PTR(-ENOMEM);
255 }
256 INIT_LIST_HEAD(&se_sess->sess_list);
257 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d
NB		 258 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
259 INIT_LIST_HEAD(&se_sess->sess_wait_list);
260 spin_lock_init(&se_sess->sess_cmd_lock);
c66ac9db
NB		 261
262 return se_sess;
263}
264EXPORT_SYMBOL(transport_init_session);
265
266/*
267 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
268 */
269void __transport_register_session(
270 struct se_portal_group *se_tpg,
271 struct se_node_acl *se_nacl,
272 struct se_session *se_sess,
273 void *fabric_sess_ptr)
274{
275 unsigned char buf[PR_REG_ISID_LEN];
276
277 se_sess->se_tpg = se_tpg;
278 se_sess->fabric_sess_ptr = fabric_sess_ptr;
279 /*
280 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
281 *
282 * Only set for struct se_session's that will actually be moving I/O.
283 * eg: *NOT* discovery sessions.
284 */
285 if (se_nacl) {
286 /*
287 * If the fabric module supports an ISID based TransportID,
288 * save this value in binary from the fabric I_T Nexus now.
289 */
e3d6f909 290 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 291 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 292 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 293 &buf[0], PR_REG_ISID_LEN);
294 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
295 }
296 spin_lock_irq(&se_nacl->nacl_sess_lock);
297 /*
298 * The se_nacl->nacl_sess pointer will be set to the
299 * last active I_T Nexus for each struct se_node_acl.
300 */
301 se_nacl->nacl_sess = se_sess;
302
303 list_add_tail(&se_sess->sess_acl_list,
304 &se_nacl->acl_sess_list);
305 spin_unlock_irq(&se_nacl->nacl_sess_lock);
306 }
307 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
308
6708bb27 309 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 310 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 311}
312EXPORT_SYMBOL(__transport_register_session);
313
314void transport_register_session(
315 struct se_portal_group *se_tpg,
316 struct se_node_acl *se_nacl,
317 struct se_session *se_sess,
318 void *fabric_sess_ptr)
319{
320 spin_lock_bh(&se_tpg->session_lock);
321 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
322 spin_unlock_bh(&se_tpg->session_lock);
323}
324EXPORT_SYMBOL(transport_register_session);
325
326void transport_deregister_session_configfs(struct se_session *se_sess)
327{
328 struct se_node_acl *se_nacl;
23388864 329 unsigned long flags;
c66ac9db
NB		 330 /*
331 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
332 */
333 se_nacl = se_sess->se_node_acl;
6708bb27 334 if (se_nacl) {
23388864 335 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 336 list_del(&se_sess->sess_acl_list);
337 /*
338 * If the session list is empty, then clear the pointer.
339 * Otherwise, set the struct se_session pointer from the tail
340 * element of the per struct se_node_acl active session list.
341 */
342 if (list_empty(&se_nacl->acl_sess_list))
343 se_nacl->nacl_sess = NULL;
344 else {
345 se_nacl->nacl_sess = container_of(
346 se_nacl->acl_sess_list.prev,
347 struct se_session, sess_acl_list);
348 }
23388864 349 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 350 }
351}
352EXPORT_SYMBOL(transport_deregister_session_configfs);
353
354void transport_free_session(struct se_session *se_sess)
355{
356 kmem_cache_free(se_sess_cache, se_sess);
357}
358EXPORT_SYMBOL(transport_free_session);
359
360void transport_deregister_session(struct se_session *se_sess)
361{
362 struct se_portal_group *se_tpg = se_sess->se_tpg;
363 struct se_node_acl *se_nacl;
e63a8e19 364 unsigned long flags;
c66ac9db 365
6708bb27 366 if (!se_tpg) {
c66ac9db
NB		 367 transport_free_session(se_sess);
368 return;
369 }
c66ac9db 370
e63a8e19 371 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 372 list_del(&se_sess->sess_list);
373 se_sess->se_tpg = NULL;
374 se_sess->fabric_sess_ptr = NULL;
e63a8e19 375 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 376
377 /*
378 * Determine if we need to do extra work for this initiator node's
379 * struct se_node_acl if it had been previously dynamically generated.
380 */
381 se_nacl = se_sess->se_node_acl;
6708bb27 382 if (se_nacl) {
e63a8e19 383 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 384 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 385 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
386 se_tpg)) {
c66ac9db
NB		 387 list_del(&se_nacl->acl_list);
388 se_tpg->num_node_acls--;
e63a8e19 389 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 390
391 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 392 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 393 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 394 se_nacl);
e63a8e19 395 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 396 }
397 }
e63a8e19 398 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 399 }
400
401 transport_free_session(se_sess);
402
6708bb27 403 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 404 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 405}
406EXPORT_SYMBOL(transport_deregister_session);
407
408/*
a1d8b49a 409 * Called with cmd->t_state_lock held.
c66ac9db
NB		 410 */
411static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
412{
42bf829e 413 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 414 struct se_task *task;
415 unsigned long flags;
416
42bf829e
CH		 417 if (!dev)
418 return;
c66ac9db 419
42bf829e 420 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 421 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 422 continue;
423
c66ac9db 424 spin_lock_irqsave(&dev->execute_task_lock, flags);
1880807a
CH		 425 if (task->t_state_active) {
426 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
427 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db 428
1880807a
CH		 429 list_del(&task->t_state_list);
430 atomic_dec(&cmd->t_task_cdbs_ex_left);
431 task->t_state_active = false;
432 }
433 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db 434 }
1880807a 435
c66ac9db
NB		 436}
437
438/* transport_cmd_check_stop():
439 *
440 * 'transport_off = 1' determines if t_transport_active should be cleared.
441 * 'transport_off = 2' determines if task_dev_state should be removed.
442 *
443 * A non-zero u8 t_state sets cmd->t_state.
444 * Returns 1 when command is stopped, else 0.
445 */
446static int transport_cmd_check_stop(
447 struct se_cmd *cmd,
448 int transport_off,
449 u8 t_state)
450{
451 unsigned long flags;
452
a1d8b49a 453 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 454 /*
455 * Determine if IOCTL context caller in requesting the stopping of this
456 * command for LUN shutdown purposes.
457 */
a1d8b49a 458 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 459 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 460 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 461 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 462
a1d8b49a 463 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 464 if (transport_off == 2)
465 transport_all_task_dev_remove_state(cmd);
a1d8b49a 466 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 467
a1d8b49a 468 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 469 return 1;
470 }
471 /*
472 * Determine if frontend context caller is requesting the stopping of
e3d6f909 473 * this command for frontend exceptions.
c66ac9db 474 */
a1d8b49a 475 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 476 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 477 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 478 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 479
c66ac9db
NB		 480 if (transport_off == 2)
481 transport_all_task_dev_remove_state(cmd);
482
483 /*
484 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
485 * to FE.
486 */
487 if (transport_off == 2)
488 cmd->se_lun = NULL;
a1d8b49a 489 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 490
a1d8b49a 491 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 492 return 1;
493 }
494 if (transport_off) {
a1d8b49a 495 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 496 if (transport_off == 2) {
497 transport_all_task_dev_remove_state(cmd);
498 /*
499 * Clear struct se_cmd->se_lun before the transport_off == 2
500 * handoff to fabric module.
501 */
502 cmd->se_lun = NULL;
503 /*
504 * Some fabric modules like tcm_loop can release
25985edc 505 * their internally allocated I/O reference now and
c66ac9db 506 * struct se_cmd now.
88dd9e26
NB		 507 *
508 * Fabric modules are expected to return '1' here if the
509 * se_cmd being passed is released at this point,
510 * or zero if not being released.
c66ac9db 511 */
e3d6f909 512 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 513 spin_unlock_irqrestore(
a1d8b49a 514 &cmd->t_state_lock, flags);
c66ac9db 515
88dd9e26 516 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 517 }
518 }
a1d8b49a 519 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 520
521 return 0;
522 } else if (t_state)
523 cmd->t_state = t_state;
a1d8b49a 524 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 525
526 return 0;
527}
528
529static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
530{
531 return transport_cmd_check_stop(cmd, 2, 0);
532}
533
534static void transport_lun_remove_cmd(struct se_cmd *cmd)
535{
e3d6f909 536 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 537 unsigned long flags;
538
539 if (!lun)
540 return;
541
a1d8b49a 542 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 543 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 545 goto check_lun;
546 }
a1d8b49a 547 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 548 transport_all_task_dev_remove_state(cmd);
a1d8b49a 549 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 550
c66ac9db
NB		 551
552check_lun:
553 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 554 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 555 list_del(&cmd->se_lun_node);
a1d8b49a 556 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 557#if 0
6708bb27 558 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 559 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 560#endif
561 }
562 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
563}
564
565void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
566{
8dc52b54
NB		 567 if (!cmd->se_tmr_req)
568 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 569
570 if (transport_cmd_check_stop_to_fabric(cmd))
571 return;
77039d1e 572 if (remove) {
3df8d40b 573 transport_remove_cmd_from_queue(cmd);
e6a2573f 574 transport_put_cmd(cmd);
77039d1e 575 }
c66ac9db
NB		 576}
577
f7a5cc0b
CH		 578static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
579 bool at_head)
c66ac9db
NB		 580{
581 struct se_device *dev = cmd->se_dev;
e3d6f909 582 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 583 unsigned long flags;
584
c66ac9db 585 if (t_state) {
a1d8b49a 586 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 587 cmd->t_state = t_state;
a1d8b49a
AG		 588 atomic_set(&cmd->t_transport_active, 1);
589 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 590 }
591
592 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 593
594 /* If the cmd is already on the list, remove it before we add it */
595 if (!list_empty(&cmd->se_queue_node))
596 list_del(&cmd->se_queue_node);
597 else
598 atomic_inc(&qobj->queue_cnt);
599
f7a5cc0b 600 if (at_head)
07bde79a 601 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 602 else
07bde79a 603 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 604 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 605 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
606
c66ac9db 607 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 608}
609
5951146d
AG		 610static struct se_cmd *
611transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 612{
5951146d 613 struct se_cmd *cmd;
c66ac9db
NB		 614 unsigned long flags;
615
616 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
617 if (list_empty(&qobj->qobj_list)) {
618 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
619 return NULL;
620 }
5951146d 621 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 622
79a7fef2 623 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 624
79a7fef2 625 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 626 atomic_dec(&qobj->queue_cnt);
627 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
628
5951146d 629 return cmd;
c66ac9db
NB		 630}
631
3df8d40b 632static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 633{
3df8d40b 634 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 635 unsigned long flags;
636
637 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 638 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 639 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
640 return;
641 }
79a7fef2
RD		 642 atomic_set(&cmd->t_transport_queue_active, 0);
643 atomic_dec(&qobj->queue_cnt);
644 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 645 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
646
a1d8b49a 647 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 648 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 649 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 650 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 651 }
652}
653
654/*
655 * Completion function used by TCM subsystem plugins (such as FILEIO)
656 * for queueing up response from struct se_subsystem_api->do_task()
657 */
658void transport_complete_sync_cache(struct se_cmd *cmd, int good)
659{
a1d8b49a 660 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 661 struct se_task, t_list);
662
663 if (good) {
664 cmd->scsi_status = SAM_STAT_GOOD;
665 task->task_scsi_status = GOOD;
666 } else {
667 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
03e98c9e
NB		 668 task->task_se_cmd->scsi_sense_reason =
669 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
670
c66ac9db
NB		 671 }
672
673 transport_complete_task(task, good);
674}
675EXPORT_SYMBOL(transport_complete_sync_cache);
676
35e0e757
CH		 677static void target_complete_failure_work(struct work_struct *work)
678{
679 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
680
03e98c9e 681 transport_generic_request_failure(cmd);
35e0e757
CH		 682}
683
c66ac9db
NB		 684/* transport_complete_task():
685 *
686 * Called from interrupt and non interrupt context depending
687 * on the transport plugin.
688 */
689void transport_complete_task(struct se_task *task, int success)
690{
e3d6f909 691 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 692 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 693 unsigned long flags;
694#if 0
6708bb27 695 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 696 cmd->t_task_cdb[0], dev);
c66ac9db 697#endif
e3d6f909 698 if (dev)
c66ac9db 699 atomic_inc(&dev->depth_left);
c66ac9db 700
a1d8b49a 701 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 702 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 703
704 /*
705 * See if any sense data exists, if so set the TASK_SENSE flag.
706 * Also check for any other post completion work that needs to be
707 * done by the plugins.
708 */
709 if (dev && dev->transport->transport_complete) {
710 if (dev->transport->transport_complete(task) != 0) {
711 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
ef804a84 712 task->task_flags |= TF_HAS_SENSE;
c66ac9db
NB		 713 success = 1;
714 }
715 }
716
717 /*
718 * See if we are waiting for outstanding struct se_task
719 * to complete for an exception condition
720 */
6c76bf95 721 if (task->task_flags & TF_REQUEST_STOP) {
a1d8b49a 722 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 723 complete(&task->task_stop_comp);
724 return;
725 }
2235007c
CH		 726
727 if (!success)
728 cmd->t_tasks_failed = 1;
729
c66ac9db
NB		 730 /*
731 * Decrement the outstanding t_task_cdbs_left count. The last
732 * struct se_task from struct se_cmd will complete itself into the
733 * device queue depending upon int success.
734 */
6708bb27 735 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
a1d8b49a 736 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 737 return;
738 }
739
2235007c 740 if (cmd->t_tasks_failed) {
41e16e98 741 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 742 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 743 } else {
a1d8b49a 744 atomic_set(&cmd->t_transport_complete, 1);
35e0e757 745 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 746 }
35e0e757 747
35e0e757
CH		 748 cmd->t_state = TRANSPORT_COMPLETE;
749 atomic_set(&cmd->t_transport_active, 1);
a1d8b49a 750 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 751
35e0e757 752 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 753}
754EXPORT_SYMBOL(transport_complete_task);
755
756/*
757 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
758 * struct se_task list are ready to be added to the active execution list
759 * struct se_device
760
761 * Called with se_dev_t->execute_task_lock called.
762 */
763static inline int transport_add_task_check_sam_attr(
764 struct se_task *task,
765 struct se_task *task_prev,
766 struct se_device *dev)
767{
768 /*
769 * No SAM Task attribute emulation enabled, add to tail of
770 * execution queue
771 */
772 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
773 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
774 return 0;
775 }
776 /*
777 * HEAD_OF_QUEUE attribute for received CDB, which means
778 * the first task that is associated with a struct se_cmd goes to
779 * head of the struct se_device->execute_task_list, and task_prev
780 * after that for each subsequent task
781 */
e66ecd50 782 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 783 list_add(&task->t_execute_list,
784 (task_prev != NULL) ?
785 &task_prev->t_execute_list :
786 &dev->execute_task_list);
787
6708bb27 788 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 789 " in execution queue\n",
6708bb27 790 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 791 return 1;
792 }
793 /*
794 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
795 * transitioned from Dermant -> Active state, and are added to the end
796 * of the struct se_device->execute_task_list
797 */
798 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
799 return 0;
800}
801
802/* __transport_add_task_to_execute_queue():
803 *
804 * Called with se_dev_t->execute_task_lock called.
805 */
806static void __transport_add_task_to_execute_queue(
807 struct se_task *task,
808 struct se_task *task_prev,
809 struct se_device *dev)
810{
811 int head_of_queue;
812
813 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
814 atomic_inc(&dev->execute_tasks);
815
1880807a 816 if (task->t_state_active)
c66ac9db
NB		 817 return;
818 /*
819 * Determine if this task needs to go to HEAD_OF_QUEUE for the
820 * state list as well. Running with SAM Task Attribute emulation
821 * will always return head_of_queue == 0 here
822 */
823 if (head_of_queue)
824 list_add(&task->t_state_list, (task_prev) ?
825 &task_prev->t_state_list :
826 &dev->state_task_list);
827 else
828 list_add_tail(&task->t_state_list, &dev->state_task_list);
829
1880807a 830 task->t_state_active = true;
c66ac9db 831
6708bb27 832 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 833 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 834 task, dev);
835}
836
837static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
838{
42bf829e 839 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 840 struct se_task *task;
841 unsigned long flags;
842
a1d8b49a
AG		 843 spin_lock_irqsave(&cmd->t_state_lock, flags);
844 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db 845 spin_lock(&dev->execute_task_lock);
1880807a
CH		 846 if (!task->t_state_active) {
847 list_add_tail(&task->t_state_list,
848 &dev->state_task_list);
849 task->t_state_active = true;
850
851 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
852 task->task_se_cmd->se_tfo->get_task_tag(
853 task->task_se_cmd), task, dev);
854 }
c66ac9db
NB		 855 spin_unlock(&dev->execute_task_lock);
856 }
a1d8b49a 857 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 858}
859
860static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
861{
5951146d 862 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 863 struct se_task *task, *task_prev = NULL;
864 unsigned long flags;
865
866 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 867 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 868 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 869 continue;
870 /*
871 * __transport_add_task_to_execute_queue() handles the
872 * SAM Task Attribute emulation if enabled
873 */
874 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 875 task_prev = task;
876 }
877 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 878}
879
04629b7b
CH		 880void __transport_remove_task_from_execute_queue(struct se_task *task,
881 struct se_device *dev)
882{
883 list_del_init(&task->t_execute_list);
884 atomic_dec(&dev->execute_tasks);
885}
886
e26d99ae 887static void transport_remove_task_from_execute_queue(
c66ac9db
NB		 888 struct se_task *task,
889 struct se_device *dev)
890{
891 unsigned long flags;
892
04629b7b 893 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 894 return;
af57c3ac 895
c66ac9db 896 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 897 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 898 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
899}
900
07bde79a 901/*
f147abb4 902 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 903 */
904
905static void target_qf_do_work(struct work_struct *work)
906{
907 struct se_device *dev = container_of(work, struct se_device,
908 qf_work_queue);
bcac364a 909 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 910 struct se_cmd *cmd, *cmd_tmp;
911
912 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 913 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
914 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 915
bcac364a 916 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 917 list_del(&cmd->se_qf_node);
918 atomic_dec(&dev->dev_qf_count);
919 smp_mb__after_atomic_dec();
07bde79a 920
6708bb27 921 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 922 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 923 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 924 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
925 : "UNKNOWN");
f7a5cc0b
CH		 926
927 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 928 }
07bde79a
NB		 929}
930
c66ac9db
NB		 931unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
932{
933 switch (cmd->data_direction) {
934 case DMA_NONE:
935 return "NONE";
936 case DMA_FROM_DEVICE:
937 return "READ";
938 case DMA_TO_DEVICE:
939 return "WRITE";
940 case DMA_BIDIRECTIONAL:
941 return "BIDI";
942 default:
943 break;
944 }
945
946 return "UNKNOWN";
947}
948
949void transport_dump_dev_state(
950 struct se_device *dev,
951 char *b,
952 int *bl)
953{
954 *bl += sprintf(b + *bl, "Status: ");
955 switch (dev->dev_status) {
956 case TRANSPORT_DEVICE_ACTIVATED:
957 *bl += sprintf(b + *bl, "ACTIVATED");
958 break;
959 case TRANSPORT_DEVICE_DEACTIVATED:
960 *bl += sprintf(b + *bl, "DEACTIVATED");
961 break;
962 case TRANSPORT_DEVICE_SHUTDOWN:
963 *bl += sprintf(b + *bl, "SHUTDOWN");
964 break;
965 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
966 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
967 *bl += sprintf(b + *bl, "OFFLINE");
968 break;
969 default:
970 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
971 break;
972 }
973
974 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
975 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
976 dev->queue_depth);
977 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 978 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 979 *bl += sprintf(b + *bl, " ");
980}
981
c66ac9db
NB		 982void transport_dump_vpd_proto_id(
983 struct t10_vpd *vpd,
984 unsigned char *p_buf,
985 int p_buf_len)
986{
987 unsigned char buf[VPD_TMP_BUF_SIZE];
988 int len;
989
990 memset(buf, 0, VPD_TMP_BUF_SIZE);
991 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
992
993 switch (vpd->protocol_identifier) {
994 case 0x00:
995 sprintf(buf+len, "Fibre Channel\n");
996 break;
997 case 0x10:
998 sprintf(buf+len, "Parallel SCSI\n");
999 break;
1000 case 0x20:
1001 sprintf(buf+len, "SSA\n");
1002 break;
1003 case 0x30:
1004 sprintf(buf+len, "IEEE 1394\n");
1005 break;
1006 case 0x40:
1007 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1008 " Protocol\n");
1009 break;
1010 case 0x50:
1011 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1012 break;
1013 case 0x60:
1014 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1015 break;
1016 case 0x70:
1017 sprintf(buf+len, "Automation/Drive Interface Transport"
1018 " Protocol\n");
1019 break;
1020 case 0x80:
1021 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1022 break;
1023 default:
1024 sprintf(buf+len, "Unknown 0x%02x\n",
1025 vpd->protocol_identifier);
1026 break;
1027 }
1028
1029 if (p_buf)
1030 strncpy(p_buf, buf, p_buf_len);
1031 else
6708bb27 1032 pr_debug("%s", buf);
c66ac9db
NB		 1033}
1034
1035void
1036transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1037{
1038 /*
1039 * Check if the Protocol Identifier Valid (PIV) bit is set..
1040 *
1041 * from spc3r23.pdf section 7.5.1
1042 */
1043 if (page_83[1] & 0x80) {
1044 vpd->protocol_identifier = (page_83[0] & 0xf0);
1045 vpd->protocol_identifier_set = 1;
1046 transport_dump_vpd_proto_id(vpd, NULL, 0);
1047 }
1048}
1049EXPORT_SYMBOL(transport_set_vpd_proto_id);
1050
1051int transport_dump_vpd_assoc(
1052 struct t10_vpd *vpd,
1053 unsigned char *p_buf,
1054 int p_buf_len)
1055{
1056 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1057 int ret = 0;
1058 int len;
c66ac9db
NB		 1059
1060 memset(buf, 0, VPD_TMP_BUF_SIZE);
1061 len = sprintf(buf, "T10 VPD Identifier Association: ");
1062
1063 switch (vpd->association) {
1064 case 0x00:
1065 sprintf(buf+len, "addressed logical unit\n");
1066 break;
1067 case 0x10:
1068 sprintf(buf+len, "target port\n");
1069 break;
1070 case 0x20:
1071 sprintf(buf+len, "SCSI target device\n");
1072 break;
1073 default:
1074 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1075 ret = -EINVAL;
c66ac9db
NB		 1076 break;
1077 }
1078
1079 if (p_buf)
1080 strncpy(p_buf, buf, p_buf_len);
1081 else
6708bb27 1082 pr_debug("%s", buf);
c66ac9db
NB		 1083
1084 return ret;
1085}
1086
1087int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1088{
1089 /*
1090 * The VPD identification association..
1091 *
1092 * from spc3r23.pdf Section 7.6.3.1 Table 297
1093 */
1094 vpd->association = (page_83[1] & 0x30);
1095 return transport_dump_vpd_assoc(vpd, NULL, 0);
1096}
1097EXPORT_SYMBOL(transport_set_vpd_assoc);
1098
1099int transport_dump_vpd_ident_type(
1100 struct t10_vpd *vpd,
1101 unsigned char *p_buf,
1102 int p_buf_len)
1103{
1104 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1105 int ret = 0;
1106 int len;
c66ac9db
NB		 1107
1108 memset(buf, 0, VPD_TMP_BUF_SIZE);
1109 len = sprintf(buf, "T10 VPD Identifier Type: ");
1110
1111 switch (vpd->device_identifier_type) {
1112 case 0x00:
1113 sprintf(buf+len, "Vendor specific\n");
1114 break;
1115 case 0x01:
1116 sprintf(buf+len, "T10 Vendor ID based\n");
1117 break;
1118 case 0x02:
1119 sprintf(buf+len, "EUI-64 based\n");
1120 break;
1121 case 0x03:
1122 sprintf(buf+len, "NAA\n");
1123 break;
1124 case 0x04:
1125 sprintf(buf+len, "Relative target port identifier\n");
1126 break;
1127 case 0x08:
1128 sprintf(buf+len, "SCSI name string\n");
1129 break;
1130 default:
1131 sprintf(buf+len, "Unsupported: 0x%02x\n",
1132 vpd->device_identifier_type);
e3d6f909 1133 ret = -EINVAL;
c66ac9db
NB		 1134 break;
1135 }
1136
e3d6f909
AG		 1137 if (p_buf) {
1138 if (p_buf_len < strlen(buf)+1)
1139 return -EINVAL;
c66ac9db 1140 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1141 } else {
6708bb27 1142 pr_debug("%s", buf);
e3d6f909 1143 }
c66ac9db
NB		 1144
1145 return ret;
1146}
1147
1148int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1149{
1150 /*
1151 * The VPD identifier type..
1152 *
1153 * from spc3r23.pdf Section 7.6.3.1 Table 298
1154 */
1155 vpd->device_identifier_type = (page_83[1] & 0x0f);
1156 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1157}
1158EXPORT_SYMBOL(transport_set_vpd_ident_type);
1159
1160int transport_dump_vpd_ident(
1161 struct t10_vpd *vpd,
1162 unsigned char *p_buf,
1163 int p_buf_len)
1164{
1165 unsigned char buf[VPD_TMP_BUF_SIZE];
1166 int ret = 0;
1167
1168 memset(buf, 0, VPD_TMP_BUF_SIZE);
1169
1170 switch (vpd->device_identifier_code_set) {
1171 case 0x01: /* Binary */
1172 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1173 &vpd->device_identifier[0]);
1174 break;
1175 case 0x02: /* ASCII */
1176 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1177 &vpd->device_identifier[0]);
1178 break;
1179 case 0x03: /* UTF-8 */
1180 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1181 &vpd->device_identifier[0]);
1182 break;
1183 default:
1184 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1185 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1186 ret = -EINVAL;
c66ac9db
NB		 1187 break;
1188 }
1189
1190 if (p_buf)
1191 strncpy(p_buf, buf, p_buf_len);
1192 else
6708bb27 1193 pr_debug("%s", buf);
c66ac9db
NB		 1194
1195 return ret;
1196}
1197
1198int
1199transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1200{
1201 static const char hex_str[] = "0123456789abcdef";
1202 int j = 0, i = 4; /* offset to start of the identifer */
1203
1204 /*
1205 * The VPD Code Set (encoding)
1206 *
1207 * from spc3r23.pdf Section 7.6.3.1 Table 296
1208 */
1209 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1210 switch (vpd->device_identifier_code_set) {
1211 case 0x01: /* Binary */
1212 vpd->device_identifier[j++] =
1213 hex_str[vpd->device_identifier_type];
1214 while (i < (4 + page_83[3])) {
1215 vpd->device_identifier[j++] =
1216 hex_str[(page_83[i] & 0xf0) >> 4];
1217 vpd->device_identifier[j++] =
1218 hex_str[page_83[i] & 0x0f];
1219 i++;
1220 }
1221 break;
1222 case 0x02: /* ASCII */
1223 case 0x03: /* UTF-8 */
1224 while (i < (4 + page_83[3]))
1225 vpd->device_identifier[j++] = page_83[i++];
1226 break;
1227 default:
1228 break;
1229 }
1230
1231 return transport_dump_vpd_ident(vpd, NULL, 0);
1232}
1233EXPORT_SYMBOL(transport_set_vpd_ident);
1234
1235static void core_setup_task_attr_emulation(struct se_device *dev)
1236{
1237 /*
1238 * If this device is from Target_Core_Mod/pSCSI, disable the
1239 * SAM Task Attribute emulation.
1240 *
1241 * This is currently not available in upsream Linux/SCSI Target
1242 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1243 */
e3d6f909 1244 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1245 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1246 return;
1247 }
1248
1249 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1250 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1251 " device\n", dev->transport->name,
1252 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1253}
1254
1255static void scsi_dump_inquiry(struct se_device *dev)
1256{
e3d6f909 1257 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1258 int i, device_type;
1259 /*
1260 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1261 */
6708bb27 1262 pr_debug(" Vendor: ");
c66ac9db
NB		 1263 for (i = 0; i < 8; i++)
1264 if (wwn->vendor[i] >= 0x20)
6708bb27 1265 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1266 else
6708bb27 1267 pr_debug(" ");
c66ac9db 1268
6708bb27 1269 pr_debug(" Model: ");
c66ac9db
NB		 1270 for (i = 0; i < 16; i++)
1271 if (wwn->model[i] >= 0x20)
6708bb27 1272 pr_debug("%c", wwn->model[i]);
c66ac9db 1273 else
6708bb27 1274 pr_debug(" ");
c66ac9db 1275
6708bb27 1276 pr_debug(" Revision: ");
c66ac9db
NB		 1277 for (i = 0; i < 4; i++)
1278 if (wwn->revision[i] >= 0x20)
6708bb27 1279 pr_debug("%c", wwn->revision[i]);
c66ac9db 1280 else
6708bb27 1281 pr_debug(" ");
c66ac9db 1282
6708bb27 1283 pr_debug("\n");
c66ac9db 1284
e3d6f909 1285 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1286 pr_debug(" Type: %s ", scsi_device_type(device_type));
1287 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1288 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1289}
1290
1291struct se_device *transport_add_device_to_core_hba(
1292 struct se_hba *hba,
1293 struct se_subsystem_api *transport,
1294 struct se_subsystem_dev *se_dev,
1295 u32 device_flags,
1296 void *transport_dev,
1297 struct se_dev_limits *dev_limits,
1298 const char *inquiry_prod,
1299 const char *inquiry_rev)
1300{
12a18bdc 1301 int force_pt;
c66ac9db
NB		 1302 struct se_device *dev;
1303
1304 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1305 if (!dev) {
1306 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1307 return NULL;
1308 }
c66ac9db 1309
e3d6f909 1310 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1311 dev->dev_flags = device_flags;
1312 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1313 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1314 dev->se_hba = hba;
1315 dev->se_sub_dev = se_dev;
1316 dev->transport = transport;
c66ac9db
NB		 1317 INIT_LIST_HEAD(&dev->dev_list);
1318 INIT_LIST_HEAD(&dev->dev_sep_list);
1319 INIT_LIST_HEAD(&dev->dev_tmr_list);
1320 INIT_LIST_HEAD(&dev->execute_task_list);
1321 INIT_LIST_HEAD(&dev->delayed_cmd_list);
c66ac9db 1322 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1323 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1324 spin_lock_init(&dev->execute_task_lock);
1325 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1326 spin_lock_init(&dev->dev_reservation_lock);
1327 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1328 spin_lock_init(&dev->se_port_lock);
1329 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1330 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1331
1332 dev->queue_depth = dev_limits->queue_depth;
1333 atomic_set(&dev->depth_left, dev->queue_depth);
1334 atomic_set(&dev->dev_ordered_id, 0);
1335
1336 se_dev_set_default_attribs(dev, dev_limits);
1337
1338 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1339 dev->creation_time = get_jiffies_64();
1340 spin_lock_init(&dev->stats_lock);
1341
1342 spin_lock(&hba->device_lock);
1343 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1344 hba->dev_count++;
1345 spin_unlock(&hba->device_lock);
1346 /*
1347 * Setup the SAM Task Attribute emulation for struct se_device
1348 */
1349 core_setup_task_attr_emulation(dev);
1350 /*
1351 * Force PR and ALUA passthrough emulation with internal object use.
1352 */
1353 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1354 /*
1355 * Setup the Reservations infrastructure for struct se_device
1356 */
1357 core_setup_reservations(dev, force_pt);
1358 /*
1359 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1360 */
1361 if (core_setup_alua(dev, force_pt) < 0)
1362 goto out;
1363
1364 /*
1365 * Startup the struct se_device processing thread
1366 */
1367 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1368 "LIO_%s", dev->transport->name);
c66ac9db 1369 if (IS_ERR(dev->process_thread)) {
6708bb27 1370 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1371 dev->transport->name);
c66ac9db
NB		 1372 goto out;
1373 }
07bde79a
NB		 1374 /*
1375 * Setup work_queue for QUEUE_FULL
1376 */
1377 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1378 /*
1379 * Preload the initial INQUIRY const values if we are doing
1380 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1381 * passthrough because this is being provided by the backend LLD.
1382 * This is required so that transport_get_inquiry() copies these
1383 * originals once back into DEV_T10_WWN(dev) for the virtual device
1384 * setup.
1385 */
e3d6f909 1386 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1387 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1388 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1389 " INQUIRY consts\n");
1390 goto out;
1391 }
1392
e3d6f909
AG		 1393 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1394 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1395 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1396 }
1397 scsi_dump_inquiry(dev);
1398
12a18bdc 1399 return dev;
c66ac9db 1400out:
c66ac9db
NB		 1401 kthread_stop(dev->process_thread);
1402
1403 spin_lock(&hba->device_lock);
1404 list_del(&dev->dev_list);
1405 hba->dev_count--;
1406 spin_unlock(&hba->device_lock);
1407
1408 se_release_vpd_for_dev(dev);
1409
c66ac9db
NB		 1410 kfree(dev);
1411
1412 return NULL;
1413}
1414EXPORT_SYMBOL(transport_add_device_to_core_hba);
1415
1416/* transport_generic_prepare_cdb():
1417 *
1418 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1419 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1420 * The point of this is since we are mapping iSCSI LUNs to
1421 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1422 * devices and HBAs for a loop.
1423 */
1424static inline void transport_generic_prepare_cdb(
1425 unsigned char *cdb)
1426{
1427 switch (cdb[0]) {
1428 case READ_10: /* SBC - RDProtect */
1429 case READ_12: /* SBC - RDProtect */
1430 case READ_16: /* SBC - RDProtect */
1431 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1432 case VERIFY: /* SBC - VRProtect */
1433 case VERIFY_16: /* SBC - VRProtect */
1434 case WRITE_VERIFY: /* SBC - VRProtect */
1435 case WRITE_VERIFY_12: /* SBC - VRProtect */
1436 break;
1437 default:
1438 cdb[1] &= 0x1f; /* clear logical unit number */
1439 break;
1440 }
1441}
1442
1443static struct se_task *
1444transport_generic_get_task(struct se_cmd *cmd,
1445 enum dma_data_direction data_direction)
1446{
1447 struct se_task *task;
5951146d 1448 struct se_device *dev = cmd->se_dev;
c66ac9db 1449
6708bb27 1450 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1451 if (!task) {
6708bb27 1452 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1453 return NULL;
1454 }
1455
1456 INIT_LIST_HEAD(&task->t_list);
1457 INIT_LIST_HEAD(&task->t_execute_list);
1458 INIT_LIST_HEAD(&task->t_state_list);
1459 init_completion(&task->task_stop_comp);
c66ac9db 1460 task->task_se_cmd = cmd;
c66ac9db
NB		 1461 task->task_data_direction = data_direction;
1462
c66ac9db
NB		 1463 return task;
1464}
1465
1466static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1467
c66ac9db
NB		 1468/*
1469 * Used by fabric modules containing a local struct se_cmd within their
1470 * fabric dependent per I/O descriptor.
1471 */
1472void transport_init_se_cmd(
1473 struct se_cmd *cmd,
1474 struct target_core_fabric_ops *tfo,
1475 struct se_session *se_sess,
1476 u32 data_length,
1477 int data_direction,
1478 int task_attr,
1479 unsigned char *sense_buffer)
1480{
5951146d
AG		 1481 INIT_LIST_HEAD(&cmd->se_lun_node);
1482 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1483 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1484 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1485 INIT_LIST_HEAD(&cmd->se_cmd_list);
a1d8b49a
AG		 1486 INIT_LIST_HEAD(&cmd->t_task_list);
1487 init_completion(&cmd->transport_lun_fe_stop_comp);
1488 init_completion(&cmd->transport_lun_stop_comp);
1489 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1490 init_completion(&cmd->cmd_wait_comp);
a1d8b49a
AG		 1491 spin_lock_init(&cmd->t_state_lock);
1492 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1493
1494 cmd->se_tfo = tfo;
1495 cmd->se_sess = se_sess;
1496 cmd->data_length = data_length;
1497 cmd->data_direction = data_direction;
1498 cmd->sam_task_attr = task_attr;
1499 cmd->sense_buffer = sense_buffer;
1500}
1501EXPORT_SYMBOL(transport_init_se_cmd);
1502
1503static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1504{
1505 /*
1506 * Check if SAM Task Attribute emulation is enabled for this
1507 * struct se_device storage object
1508 */
5951146d 1509 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1510 return 0;
1511
e66ecd50 1512 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1513 pr_debug("SAM Task Attribute ACA"
c66ac9db 1514 " emulation is not supported\n");
e3d6f909 1515 return -EINVAL;
c66ac9db
NB		 1516 }
1517 /*
1518 * Used to determine when ORDERED commands should go from
1519 * Dormant to Active status.
1520 */
5951146d 1521 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1522 smp_mb__after_atomic_inc();
6708bb27 1523 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1524 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1525 cmd->se_dev->transport->name);
c66ac9db
NB		 1526 return 0;
1527}
1528
c66ac9db
NB		 1529/* transport_generic_allocate_tasks():
1530 *
1531 * Called from fabric RX Thread.
1532 */
1533int transport_generic_allocate_tasks(
1534 struct se_cmd *cmd,
1535 unsigned char *cdb)
1536{
1537 int ret;
1538
1539 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1540 /*
1541 * Ensure that the received CDB is less than the max (252 + 8) bytes
1542 * for VARIABLE_LENGTH_CMD
1543 */
1544 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1545 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1546 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1547 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1548 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1549 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1550 return -EINVAL;
c66ac9db
NB		 1551 }
1552 /*
1553 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1554 * allocate the additional extended CDB buffer now.. Otherwise
1555 * setup the pointer from __t_task_cdb to t_task_cdb.
1556 */
a1d8b49a
AG		 1557 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1558 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1559 GFP_KERNEL);
6708bb27
AG		 1560 if (!cmd->t_task_cdb) {
1561 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1562 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1563 scsi_command_size(cdb),
a1d8b49a 1564 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1565 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1566 cmd->scsi_sense_reason =
1567 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1568 return -ENOMEM;
c66ac9db
NB		 1569 }
1570 } else
a1d8b49a 1571 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1572 /*
a1d8b49a 1573 * Copy the original CDB into cmd->
c66ac9db 1574 */
a1d8b49a 1575 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1576 /*
1577 * Setup the received CDB based on SCSI defined opcodes and
1578 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1579 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1580 * pointer is expected to be setup before we reach this point.
1581 */
1582 ret = transport_generic_cmd_sequencer(cmd, cdb);
1583 if (ret < 0)
1584 return ret;
1585 /*
1586 * Check for SAM Task Attribute Emulation
1587 */
1588 if (transport_check_alloc_task_attr(cmd) < 0) {
1589 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1590 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1591 return -EINVAL;
c66ac9db
NB		 1592 }
1593 spin_lock(&cmd->se_lun->lun_sep_lock);
1594 if (cmd->se_lun->lun_sep)
1595 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1596 spin_unlock(&cmd->se_lun->lun_sep_lock);
1597 return 0;
1598}
1599EXPORT_SYMBOL(transport_generic_allocate_tasks);
1600
695434e1
NB		 1601/*
1602 * Used by fabric module frontends to queue tasks directly.
1603 * Many only be used from process context only
1604 */
1605int transport_handle_cdb_direct(
1606 struct se_cmd *cmd)
1607{
dd8ae59d
NB		 1608 int ret;
1609
695434e1
NB		 1610 if (!cmd->se_lun) {
1611 dump_stack();
6708bb27 1612 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1613 return -EINVAL;
1614 }
1615 if (in_interrupt()) {
1616 dump_stack();
6708bb27 1617 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1618 " from interrupt context\n");
1619 return -EINVAL;
1620 }
dd8ae59d
NB		 1621 /*
1622 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1623 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1624 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1625 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1626 *
1627 * Also, we don't take cmd->t_state_lock here as we only expect
1628 * this to be called for initial descriptor submission.
1629 */
1630 cmd->t_state = TRANSPORT_NEW_CMD;
1631 atomic_set(&cmd->t_transport_active, 1);
1632 /*
1633 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1634 * so follow TRANSPORT_NEW_CMD processing thread context usage
1635 * and call transport_generic_request_failure() if necessary..
1636 */
1637 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1638 if (ret < 0)
1639 transport_generic_request_failure(cmd);
1640
dd8ae59d 1641 return 0;
695434e1
NB		 1642}
1643EXPORT_SYMBOL(transport_handle_cdb_direct);
1644
a6360785
NB		 1645/**
1646 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1647 *
1648 * @se_cmd: command descriptor to submit
1649 * @se_sess: associated se_sess for endpoint
1650 * @cdb: pointer to SCSI CDB
1651 * @sense: pointer to SCSI sense buffer
1652 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1653 * @data_length: fabric expected data transfer length
1654 * @task_addr: SAM task attribute
1655 * @data_dir: DMA data direction
1656 * @flags: flags for command submission from target_sc_flags_tables
1657 *
1658 * This may only be called from process context, and also currently
1659 * assumes internal allocation of fabric payload buffer by target-core.
1660 **/
1661int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1662 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1663 u32 data_length, int task_attr, int data_dir, int flags)
1664{
1665 struct se_portal_group *se_tpg;
1666 int rc;
1667
1668 se_tpg = se_sess->se_tpg;
1669 BUG_ON(!se_tpg);
1670 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1671 BUG_ON(in_interrupt());
1672 /*
1673 * Initialize se_cmd for target operation. From this point
1674 * exceptions are handled by sending exception status via
1675 * target_core_fabric_ops->queue_status() callback
1676 */
1677 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1678 data_length, data_dir, task_attr, sense);
1679 /*
1680 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1681 * se_sess->sess_cmd_list. A second kref_get here is necessary
1682 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1683 * kref_put() to happen during fabric packet acknowledgement.
1684 */
1685 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1686 /*
1687 * Signal bidirectional data payloads to target-core
1688 */
1689 if (flags & TARGET_SCF_BIDI_OP)
1690 se_cmd->se_cmd_flags |= SCF_BIDI;
1691 /*
1692 * Locate se_lun pointer and attach it to struct se_cmd
1693 */
1694 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0)
1695 goto out_check_cond;
1696 /*
1697 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1698 * allocate the necessary tasks to complete the received CDB+data
1699 */
1700 rc = transport_generic_allocate_tasks(se_cmd, cdb);
1701 if (rc != 0)
1702 goto out_check_cond;
1703 /*
1704 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1705 * for immediate execution of READs, otherwise wait for
1706 * transport_generic_handle_data() to be called for WRITEs
1707 * when fabric has filled the incoming buffer.
1708 */
1709 transport_handle_cdb_direct(se_cmd);
1710 return 0;
1711
1712out_check_cond:
1713 transport_send_check_condition_and_sense(se_cmd,
1714 se_cmd->scsi_sense_reason, 0);
1715 return 0;
1716}
1717EXPORT_SYMBOL(target_submit_cmd);
1718
c66ac9db
NB		 1719/*
1720 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1721 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1722 * complete setup in TCM process context w/ TFO->new_cmd_map().
1723 */
1724int transport_generic_handle_cdb_map(
1725 struct se_cmd *cmd)
1726{
e3d6f909 1727 if (!cmd->se_lun) {
c66ac9db 1728 dump_stack();
6708bb27 1729 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1730 return -EINVAL;
c66ac9db
NB		 1731 }
1732
f7a5cc0b 1733 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1734 return 0;
1735}
1736EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1737
1738/* transport_generic_handle_data():
1739 *
1740 *
1741 */
1742int transport_generic_handle_data(
1743 struct se_cmd *cmd)
1744{
1745 /*
1746 * For the software fabric case, then we assume the nexus is being
1747 * failed/shutdown when signals are pending from the kthread context
1748 * caller, so we return a failure. For the HW target mode case running
1749 * in interrupt code, the signal_pending() check is skipped.
1750 */
1751 if (!in_interrupt() && signal_pending(current))
e3d6f909 1752 return -EPERM;
c66ac9db
NB		 1753 /*
1754 * If the received CDB has aleady been ABORTED by the generic
1755 * target engine, we now call transport_check_aborted_status()
1756 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1757 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1758 * sequences at this point.
1759 */
1760 if (transport_check_aborted_status(cmd, 1) != 0)
1761 return 0;
1762
f7a5cc0b 1763 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1764 return 0;
1765}
1766EXPORT_SYMBOL(transport_generic_handle_data);
1767
1768/* transport_generic_handle_tmr():
1769 *
1770 *
1771 */
1772int transport_generic_handle_tmr(
1773 struct se_cmd *cmd)
1774{
f7a5cc0b 1775 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1776 return 0;
1777}
1778EXPORT_SYMBOL(transport_generic_handle_tmr);
1779
cdbb70bb
CH		 1780/*
1781 * If the task is active, request it to be stopped and sleep until it
1782 * has completed.
1783 */
1784bool target_stop_task(struct se_task *task, unsigned long *flags)
1785{
1786 struct se_cmd *cmd = task->task_se_cmd;
1787 bool was_active = false;
1788
1789 if (task->task_flags & TF_ACTIVE) {
1790 task->task_flags |= TF_REQUEST_STOP;
1791 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1792
1793 pr_debug("Task %p waiting to complete\n", task);
1794 wait_for_completion(&task->task_stop_comp);
1795 pr_debug("Task %p stopped successfully\n", task);
1796
1797 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1798 atomic_dec(&cmd->t_task_cdbs_left);
1799 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1800 was_active = true;
1801 }
1802
cdbb70bb
CH		 1803 return was_active;
1804}
1805
c66ac9db
NB		 1806static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1807{
1808 struct se_task *task, *task_tmp;
1809 unsigned long flags;
1810 int ret = 0;
1811
6708bb27 1812 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1813 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1814
1815 /*
1816 * No tasks remain in the execution queue
1817 */
a1d8b49a 1818 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1819 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1820 &cmd->t_task_list, t_list) {
04629b7b 1821 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1822 /*
1823 * If the struct se_task has not been sent and is not active,
1824 * remove the struct se_task from the execution queue.
1825 */
6c76bf95 1826 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1827 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1828 flags);
1829 transport_remove_task_from_execute_queue(task,
42bf829e 1830 cmd->se_dev);
c66ac9db 1831
04629b7b 1832 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1833 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1834 continue;
1835 }
1836
cdbb70bb 1837 if (!target_stop_task(task, &flags)) {
04629b7b 1838 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1839 ret++;
1840 }
c66ac9db 1841 }
a1d8b49a 1842 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1843
1844 return ret;
1845}
1846
c66ac9db
NB		 1847/*
1848 * Handle SAM-esque emulation for generic transport request failures.
1849 */
03e98c9e 1850static void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1851{
07bde79a
NB		 1852 int ret = 0;
1853
6708bb27 1854 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1855 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1856 cmd->t_task_cdb[0]);
03e98c9e 1857 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1858 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1859 cmd->t_state, cmd->scsi_sense_reason);
6708bb27 1860 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1861 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1862 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1863 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1864 atomic_read(&cmd->t_task_cdbs_left),
1865 atomic_read(&cmd->t_task_cdbs_sent),
1866 atomic_read(&cmd->t_task_cdbs_ex_left),
1867 atomic_read(&cmd->t_transport_active),
1868 atomic_read(&cmd->t_transport_stop),
1869 atomic_read(&cmd->t_transport_sent));
c66ac9db 1870
c66ac9db
NB		 1871 /*
1872 * For SAM Task Attribute emulation for failed struct se_cmd
1873 */
1874 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1875 transport_complete_task_attr(cmd);
1876
03e98c9e
NB		 1877 switch (cmd->scsi_sense_reason) {
1878 case TCM_NON_EXISTENT_LUN:
1879 case TCM_UNSUPPORTED_SCSI_OPCODE:
1880 case TCM_INVALID_CDB_FIELD:
1881 case TCM_INVALID_PARAMETER_LIST:
1882 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1883 case TCM_UNKNOWN_MODE_PAGE:
1884 case TCM_WRITE_PROTECTED:
1885 case TCM_CHECK_CONDITION_ABORT_CMD:
1886 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1887 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1888 break;
03e98c9e 1889 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1890 /*
1891 * No SENSE Data payload for this case, set SCSI Status
1892 * and queue the response to $FABRIC_MOD.
1893 *
1894 * Uses linux/include/scsi/scsi.h SAM status codes defs
1895 */
1896 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1897 /*
1898 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1899 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1900 * CONFLICT STATUS.
1901 *
1902 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1903 */
e3d6f909
AG		 1904 if (cmd->se_sess &&
1905 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1906 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1907 cmd->orig_fe_lun, 0x2C,
1908 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1909
07bde79a 1910 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1911 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1912 goto queue_full;
c66ac9db 1913 goto check_stop;
c66ac9db 1914 default:
6708bb27 1915 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1916 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1917 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1918 break;
1919 }
16ab8e60
NB		 1920 /*
1921 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1922 * make the call to transport_send_check_condition_and_sense()
1923 * directly. Otherwise expect the fabric to make the call to
1924 * transport_send_check_condition_and_sense() after handling
1925 * possible unsoliticied write data payloads.
1926 */
03e98c9e
NB		 1927 ret = transport_send_check_condition_and_sense(cmd,
1928 cmd->scsi_sense_reason, 0);
1929 if (ret == -EAGAIN || ret == -ENOMEM)
1930 goto queue_full;
07bde79a 1931
c66ac9db
NB		 1932check_stop:
1933 transport_lun_remove_cmd(cmd);
6708bb27 1934 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1935 ;
07bde79a
NB		 1936 return;
1937
1938queue_full:
e057f533
CH		 1939 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1940 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1941}
1942
c66ac9db
NB		 1943static inline u32 transport_lba_21(unsigned char *cdb)
1944{
1945 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1946}
1947
1948static inline u32 transport_lba_32(unsigned char *cdb)
1949{
1950 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1951}
1952
1953static inline unsigned long long transport_lba_64(unsigned char *cdb)
1954{
1955 unsigned int __v1, __v2;
1956
1957 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1958 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1959
1960 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1961}
1962
1963/*
1964 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1965 */
1966static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1967{
1968 unsigned int __v1, __v2;
1969
1970 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1971 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1972
1973 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1974}
1975
1976static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1977{
1978 unsigned long flags;
1979
a1d8b49a 1980 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 1981 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 1982 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 1983}
1984
c66ac9db
NB		 1985static inline int transport_tcq_window_closed(struct se_device *dev)
1986{
1987 if (dev->dev_tcq_window_closed++ <
1988 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1989 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1990 } else
1991 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1992
e3d6f909 1993 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 1994 return 0;
1995}
1996
1997/*
1998 * Called from Fabric Module context from transport_execute_tasks()
1999 *
2000 * The return of this function determins if the tasks from struct se_cmd
2001 * get added to the execution queue in transport_execute_tasks(),
2002 * or are added to the delayed or ordered lists here.
2003 */
2004static inline int transport_execute_task_attr(struct se_cmd *cmd)
2005{
5951146d 2006 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2007 return 1;
2008 /*
25985edc 2009 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2010 * to allow the passed struct se_cmd list of tasks to the front of the list.
2011 */
e66ecd50 2012 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
6708bb27 2013 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2014 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2015 cmd->t_task_cdb[0],
c66ac9db
NB		 2016 cmd->se_ordered_id);
2017 return 1;
e66ecd50 2018 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d 2019 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2020 smp_mb__after_atomic_inc();
2021
6708bb27 2022 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2023 " list, se_ordered_id: %u\n",
a1d8b49a 2024 cmd->t_task_cdb[0],
c66ac9db
NB		 2025 cmd->se_ordered_id);
2026 /*
2027 * Add ORDERED command to tail of execution queue if
2028 * no other older commands exist that need to be
2029 * completed first.
2030 */
6708bb27 2031 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2032 return 1;
2033 } else {
2034 /*
2035 * For SIMPLE and UNTAGGED Task Attribute commands
2036 */
5951146d 2037 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2038 smp_mb__after_atomic_inc();
2039 }
2040 /*
2041 * Otherwise if one or more outstanding ORDERED task attribute exist,
2042 * add the dormant task(s) built for the passed struct se_cmd to the
2043 * execution queue and become in Active state for this struct se_device.
2044 */
5951146d 2045 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2046 /*
2047 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2048 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2049 */
5951146d 2050 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2051 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2052 list_add_tail(&cmd->se_delayed_node,
2053 &cmd->se_dev->delayed_cmd_list);
2054 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2055
6708bb27 2056 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2057 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2058 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2059 cmd->se_ordered_id);
2060 /*
2061 * Return zero to let transport_execute_tasks() know
2062 * not to add the delayed tasks to the execution list.
2063 */
2064 return 0;
2065 }
2066 /*
2067 * Otherwise, no ORDERED task attributes exist..
2068 */
2069 return 1;
2070}
2071
2072/*
2073 * Called from fabric module context in transport_generic_new_cmd() and
2074 * transport_generic_process_write()
2075 */
2076static int transport_execute_tasks(struct se_cmd *cmd)
2077{
2078 int add_tasks;
40be67f4 2079 struct se_device *se_dev = cmd->se_dev;
c66ac9db 2080
58a2801a 2081 if (se_dev_check_online(cmd->se_dev) != 0) {
03e98c9e
NB		 2082 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2083 transport_generic_request_failure(cmd);
db1620a2 2084 return 0;
c66ac9db 2085 }
db1620a2 2086
c66ac9db
NB		 2087 /*
2088 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2089 * has occurred that prevents execution.
c66ac9db 2090 */
6708bb27 2091 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2092 /*
2093 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2094 * attribute for the tasks of the received struct se_cmd CDB
2095 */
2096 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2097 if (!add_tasks)
c66ac9db
NB		 2098 goto execute_tasks;
2099 /*
2100 * This calls transport_add_tasks_from_cmd() to handle
2101 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2102 * (if enabled) in __transport_add_task_to_execute_queue() and
2103 * transport_add_task_check_sam_attr().
2104 */
2105 transport_add_tasks_from_cmd(cmd);
2106 }
2107 /*
2108 * Kick the execution queue for the cmd associated struct se_device
2109 * storage object.
2110 */
2111execute_tasks:
40be67f4 2112 __transport_execute_tasks(se_dev);
c66ac9db
NB		 2113 return 0;
2114}
2115
2116/*
2117 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2118 * from struct se_device->execute_task_list and
2119 *
2120 * Called from transport_processing_thread()
2121 */
2122static int __transport_execute_tasks(struct se_device *dev)
2123{
2124 int error;
2125 struct se_cmd *cmd = NULL;
e3d6f909 2126 struct se_task *task = NULL;
c66ac9db
NB		 2127 unsigned long flags;
2128
2129 /*
2130 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2131 * struct se_tasks to the selected transport.
c66ac9db
NB		 2132 */
2133check_depth:
e3d6f909 2134 if (!atomic_read(&dev->depth_left))
c66ac9db 2135 return transport_tcq_window_closed(dev);
c66ac9db 2136
e3d6f909 2137 dev->dev_tcq_window_closed = 0;
c66ac9db 2138
e3d6f909
AG		 2139 spin_lock_irq(&dev->execute_task_lock);
2140 if (list_empty(&dev->execute_task_list)) {
2141 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2142 return 0;
2143 }
e3d6f909
AG		 2144 task = list_first_entry(&dev->execute_task_list,
2145 struct se_task, t_execute_list);
04629b7b 2146 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2147 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2148
2149 atomic_dec(&dev->depth_left);
c66ac9db 2150
e3d6f909 2151 cmd = task->task_se_cmd;
c66ac9db 2152
a1d8b49a 2153 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2154 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2155 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2156
a1d8b49a
AG		 2157 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2158 cmd->t_task_list_num)
415a090a 2159 atomic_set(&cmd->t_transport_sent, 1);
c66ac9db 2160
a1d8b49a 2161 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2162
5bda90c8
CH		 2163 if (cmd->execute_task)
2164 error = cmd->execute_task(task);
2165 else
2166 error = dev->transport->do_task(task);
d29a5b6a 2167 if (error != 0) {
d29a5b6a
CH		 2168 spin_lock_irqsave(&cmd->t_state_lock, flags);
2169 task->task_flags &= ~TF_ACTIVE;
2170 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2171 atomic_set(&cmd->t_transport_sent, 0);
2172 transport_stop_tasks_for_cmd(cmd);
2173 atomic_inc(&dev->depth_left);
03e98c9e 2174 transport_generic_request_failure(cmd);
c66ac9db
NB		 2175 }
2176
2177 goto check_depth;
2178
2179 return 0;
2180}
2181
c66ac9db
NB		 2182static inline u32 transport_get_sectors_6(
2183 unsigned char *cdb,
2184 struct se_cmd *cmd,
2185 int *ret)
2186{
5951146d 2187 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2188
2189 /*
2190 * Assume TYPE_DISK for non struct se_device objects.
2191 * Use 8-bit sector value.
2192 */
2193 if (!dev)
2194 goto type_disk;
2195
2196 /*
2197 * Use 24-bit allocation length for TYPE_TAPE.
2198 */
e3d6f909 2199 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2200 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2201
2202 /*
2203 * Everything else assume TYPE_DISK Sector CDB location.
9b5cd7f3
RD		 2204 * Use 8-bit sector value. SBC-3 says:
2205 *
2206 * A TRANSFER LENGTH field set to zero specifies that 256
2207 * logical blocks shall be written. Any other value
2208 * specifies the number of logical blocks that shall be
2209 * written.
c66ac9db
NB		 2210 */
2211type_disk:
9b5cd7f3 2212 return cdb[4] ? : 256;
c66ac9db
NB		 2213}
2214
2215static inline u32 transport_get_sectors_10(
2216 unsigned char *cdb,
2217 struct se_cmd *cmd,
2218 int *ret)
2219{
5951146d 2220 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2221
2222 /*
2223 * Assume TYPE_DISK for non struct se_device objects.
2224 * Use 16-bit sector value.
2225 */
2226 if (!dev)
2227 goto type_disk;
2228
2229 /*
2230 * XXX_10 is not defined in SSC, throw an exception
2231 */
e3d6f909
AG		 2232 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2233 *ret = -EINVAL;
c66ac9db
NB		 2234 return 0;
2235 }
2236
2237 /*
2238 * Everything else assume TYPE_DISK Sector CDB location.
2239 * Use 16-bit sector value.
2240 */
2241type_disk:
2242 return (u32)(cdb[7] << 8) + cdb[8];
2243}
2244
2245static inline u32 transport_get_sectors_12(
2246 unsigned char *cdb,
2247 struct se_cmd *cmd,
2248 int *ret)
2249{
5951146d 2250 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2251
2252 /*
2253 * Assume TYPE_DISK for non struct se_device objects.
2254 * Use 32-bit sector value.
2255 */
2256 if (!dev)
2257 goto type_disk;
2258
2259 /*
2260 * XXX_12 is not defined in SSC, throw an exception
2261 */
e3d6f909
AG		 2262 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2263 *ret = -EINVAL;
c66ac9db
NB		 2264 return 0;
2265 }
2266
2267 /*
2268 * Everything else assume TYPE_DISK Sector CDB location.
2269 * Use 32-bit sector value.
2270 */
2271type_disk:
2272 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2273}
2274
2275static inline u32 transport_get_sectors_16(
2276 unsigned char *cdb,
2277 struct se_cmd *cmd,
2278 int *ret)
2279{
5951146d 2280 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2281
2282 /*
2283 * Assume TYPE_DISK for non struct se_device objects.
2284 * Use 32-bit sector value.
2285 */
2286 if (!dev)
2287 goto type_disk;
2288
2289 /*
2290 * Use 24-bit allocation length for TYPE_TAPE.
2291 */
e3d6f909 2292 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2293 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2294
2295type_disk:
2296 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2297 (cdb[12] << 8) + cdb[13];
2298}
2299
2300/*
2301 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2302 */
2303static inline u32 transport_get_sectors_32(
2304 unsigned char *cdb,
2305 struct se_cmd *cmd,
2306 int *ret)
2307{
2308 /*
2309 * Assume TYPE_DISK for non struct se_device objects.
2310 * Use 32-bit sector value.
2311 */
2312 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2313 (cdb[30] << 8) + cdb[31];
2314
2315}
2316
2317static inline u32 transport_get_size(
2318 u32 sectors,
2319 unsigned char *cdb,
2320 struct se_cmd *cmd)
2321{
5951146d 2322 struct se_device *dev = cmd->se_dev;
c66ac9db 2323
e3d6f909 2324 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2325 if (cdb[1] & 1) { /* sectors */
e3d6f909 2326 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2327 } else /* bytes */
2328 return sectors;
2329 }
2330#if 0
6708bb27 2331 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2332 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2333 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2334 dev->transport->name);
c66ac9db 2335#endif
e3d6f909 2336 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2337}
2338
c66ac9db
NB		 2339static void transport_xor_callback(struct se_cmd *cmd)
2340{
2341 unsigned char *buf, *addr;
ec98f782 2342 struct scatterlist *sg;
c66ac9db
NB		 2343 unsigned int offset;
2344 int i;
ec98f782 2345 int count;
c66ac9db
NB		 2346 /*
2347 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2348 *
2349 * 1) read the specified logical block(s);
2350 * 2) transfer logical blocks from the data-out buffer;
2351 * 3) XOR the logical blocks transferred from the data-out buffer with
2352 * the logical blocks read, storing the resulting XOR data in a buffer;
2353 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2354 * blocks transferred from the data-out buffer; and
2355 * 5) transfer the resulting XOR data to the data-in buffer.
2356 */
2357 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2358 if (!buf) {
2359 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2360 return;
2361 }
2362 /*
ec98f782 2363 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2364 * into the locally allocated *buf
2365 */
ec98f782
AG		 2366 sg_copy_to_buffer(cmd->t_data_sg,
2367 cmd->t_data_nents,
2368 buf,
2369 cmd->data_length);
2370
c66ac9db
NB		 2371 /*
2372 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2373 * cmd->t_mem_bidi_list
c66ac9db
NB		 2374 */
2375
2376 offset = 0;
ec98f782
AG		 2377 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2378 addr = kmap_atomic(sg_page(sg), KM_USER0);
2379 if (!addr)
c66ac9db
NB		 2380 goto out;
2381
ec98f782
AG		 2382 for (i = 0; i < sg->length; i++)
2383 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2384
ec98f782 2385 offset += sg->length;
c66ac9db
NB		 2386 kunmap_atomic(addr, KM_USER0);
2387 }
ec98f782 2388
c66ac9db
NB		 2389out:
2390 kfree(buf);
2391}
2392
2393/*
2394 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2395 */
2396static int transport_get_sense_data(struct se_cmd *cmd)
2397{
2398 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2399 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2400 struct se_task *task = NULL, *task_tmp;
2401 unsigned long flags;
2402 u32 offset = 0;
2403
e3d6f909
AG		 2404 WARN_ON(!cmd->se_lun);
2405
42bf829e
CH		 2406 if (!dev)
2407 return 0;
2408
a1d8b49a 2409 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2410 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2411 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2412 return 0;
2413 }
2414
2415 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2416 &cmd->t_task_list, t_list) {
ef804a84 2417 if (!(task->task_flags & TF_HAS_SENSE))
c66ac9db
NB		 2418 continue;
2419
e3d6f909 2420 if (!dev->transport->get_sense_buffer) {
6708bb27 2421 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2422 " is NULL\n");
2423 continue;
2424 }
2425
e3d6f909 2426 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2427 if (!sense_buffer) {
04629b7b 2428 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2429 " sense buffer for task with sense\n",
04629b7b 2430 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2431 continue;
2432 }
a1d8b49a 2433 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2434
e3d6f909 2435 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2436 TRANSPORT_SENSE_BUFFER);
2437
5951146d 2438 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2439 TRANSPORT_SENSE_BUFFER);
2440 cmd->scsi_status = task->task_scsi_status;
2441 /* Automatically padded */
2442 cmd->scsi_sense_length =
2443 (TRANSPORT_SENSE_BUFFER + offset);
2444
6708bb27 2445 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2446 " and sense\n",
e3d6f909 2447 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2448 cmd->scsi_status);
2449 return 0;
2450 }
a1d8b49a 2451 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2452
2453 return -1;
2454}
2455
ec98f782
AG		 2456static inline long long transport_dev_end_lba(struct se_device *dev)
2457{
2458 return dev->transport->get_blocks(dev) + 1;
2459}
2460
2461static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2462{
2463 struct se_device *dev = cmd->se_dev;
2464 u32 sectors;
2465
2466 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2467 return 0;
2468
2469 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2470
6708bb27
AG		 2471 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2472 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2473 " transport_dev_end_lba(): %llu\n",
2474 cmd->t_task_lba, sectors,
2475 transport_dev_end_lba(dev));
7abbe7f3 2476 return -EINVAL;
ec98f782
AG		 2477 }
2478
7abbe7f3 2479 return 0;
ec98f782
AG		 2480}
2481
706d5860
NB		 2482static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2483{
2484 /*
2485 * Determine if the received WRITE_SAME is used to for direct
2486 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2487 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2488 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2489 */
2490 int passthrough = (dev->transport->transport_type ==
2491 TRANSPORT_PLUGIN_PHBA_PDEV);
2492
2493 if (!passthrough) {
2494 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2495 pr_err("WRITE_SAME PBDATA and LBDATA"
2496 " bits not supported for Block Discard"
2497 " Emulation\n");
2498 return -ENOSYS;
2499 }
2500 /*
2501 * Currently for the emulated case we only accept
2502 * tpws with the UNMAP=1 bit set.
2503 */
2504 if (!(flags[0] & 0x08)) {
2505 pr_err("WRITE_SAME w/o UNMAP bit not"
2506 " supported for Block Discard Emulation\n");
2507 return -ENOSYS;
2508 }
2509 }
2510
2511 return 0;
2512}
2513
c66ac9db
NB		 2514/* transport_generic_cmd_sequencer():
2515 *
2516 * Generic Command Sequencer that should work for most DAS transport
2517 * drivers.
2518 *
2519 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2520 * RX Thread.
2521 *
2522 * FIXME: Need to support other SCSI OPCODES where as well.
2523 */
2524static int transport_generic_cmd_sequencer(
2525 struct se_cmd *cmd,
2526 unsigned char *cdb)
2527{
5951146d 2528 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2529 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2530 int ret = 0, sector_ret = 0, passthrough;
2531 u32 sectors = 0, size = 0, pr_reg_type = 0;
2532 u16 service_action;
2533 u8 alua_ascq = 0;
2534 /*
2535 * Check for an existing UNIT ATTENTION condition
2536 */
2537 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2538 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2539 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2540 return -EINVAL;
c66ac9db
NB		 2541 }
2542 /*
2543 * Check status of Asymmetric Logical Unit Assignment port
2544 */
e3d6f909 2545 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2546 if (ret != 0) {
c66ac9db 2547 /*
25985edc 2548 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2549 * The ALUA additional sense code qualifier (ASCQ) is determined
2550 * by the ALUA primary or secondary access state..
2551 */
2552 if (ret > 0) {
2553#if 0
6708bb27 2554 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2555 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2556 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2557#endif
2558 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2559 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2560 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2561 return -EINVAL;
c66ac9db
NB		 2562 }
2563 goto out_invalid_cdb_field;
2564 }
2565 /*
2566 * Check status for SPC-3 Persistent Reservations
2567 */
e3d6f909
AG		 2568 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2569 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2570 cmd, cdb, pr_reg_type) != 0) {
2571 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2572 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2573 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2574 return -EBUSY;
2575 }
c66ac9db
NB		 2576 /*
2577 * This means the CDB is allowed for the SCSI Initiator port
2578 * when said port is *NOT* holding the legacy SPC-2 or
2579 * SPC-3 Persistent Reservation.
2580 */
2581 }
2582
5bda90c8
CH		 2583 /*
2584 * If we operate in passthrough mode we skip most CDB emulation and
2585 * instead hand the commands down to the physical SCSI device.
2586 */
2587 passthrough =
2588 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2589
c66ac9db
NB		 2590 switch (cdb[0]) {
2591 case READ_6:
2592 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2593 if (sector_ret)
2594 goto out_unsupported_cdb;
2595 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2596 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2597 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2598 break;
2599 case READ_10:
2600 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2601 if (sector_ret)
2602 goto out_unsupported_cdb;
2603 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2604 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2605 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2606 break;
2607 case READ_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);
c66ac9db
NB		 2613 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2614 break;
2615 case READ_16:
2616 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2617 if (sector_ret)
2618 goto out_unsupported_cdb;
2619 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2620 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2621 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2622 break;
2623 case WRITE_6:
2624 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2625 if (sector_ret)
2626 goto out_unsupported_cdb;
2627 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2628 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2629 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2630 break;
2631 case WRITE_10:
2632 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2633 if (sector_ret)
2634 goto out_unsupported_cdb;
2635 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2636 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2637 if (cdb[1] & 0x8)
2638 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2639 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2640 break;
2641 case WRITE_12:
2642 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2643 if (sector_ret)
2644 goto out_unsupported_cdb;
2645 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2646 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2647 if (cdb[1] & 0x8)
2648 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2649 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2650 break;
2651 case WRITE_16:
2652 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2653 if (sector_ret)
2654 goto out_unsupported_cdb;
2655 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2656 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2657 if (cdb[1] & 0x8)
2658 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2659 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2660 break;
2661 case XDWRITEREAD_10:
2662 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2663 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2664 goto out_invalid_cdb_field;
2665 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2666 if (sector_ret)
2667 goto out_unsupported_cdb;
2668 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2669 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2670 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2671
5bda90c8
CH		 2672 /*
2673 * Do now allow BIDI commands for passthrough mode.
2674 */
2675 if (passthrough)
7c1c6af3 2676 goto out_unsupported_cdb;
5bda90c8 2677
c66ac9db 2678 /*
35e0e757 2679 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2680 */
2681 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2682 if (cdb[1] & 0x8)
2683 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2684 break;
2685 case VARIABLE_LENGTH_CMD:
2686 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2687 switch (service_action) {
2688 case XDWRITEREAD_32:
2689 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2690 if (sector_ret)
2691 goto out_unsupported_cdb;
2692 size = transport_get_size(sectors, cdb, cmd);
2693 /*
2694 * Use WRITE_32 and READ_32 opcodes for the emulated
2695 * XDWRITE_READ_32 logic.
2696 */
a1d8b49a 2697 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2698 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2699
5bda90c8
CH		 2700 /*
2701 * Do now allow BIDI commands for passthrough mode.
2702 */
c66ac9db 2703 if (passthrough)
7c1c6af3 2704 goto out_unsupported_cdb;
5bda90c8 2705
c66ac9db 2706 /*
35e0e757
CH		 2707 * Setup BIDI XOR callback to be run during after I/O
2708 * completion.
c66ac9db
NB		 2709 */
2710 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2711 if (cdb[1] & 0x8)
2712 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2713 break;
2714 case WRITE_SAME_32:
2715 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2716 if (sector_ret)
2717 goto out_unsupported_cdb;
dd3a5ad8 2718
6708bb27 2719 if (sectors)
12850626 2720 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2721 else {
2722 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2723 " supported\n");
2724 goto out_invalid_cdb_field;
2725 }
dd3a5ad8 2726
a1d8b49a 2727 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2728 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2729
706d5860 2730 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2731 goto out_invalid_cdb_field;
5bda90c8
CH		 2732 if (!passthrough)
2733 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2734 break;
2735 default:
6708bb27 2736 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2737 " 0x%04x not supported\n", service_action);
2738 goto out_unsupported_cdb;
2739 }
2740 break;
e434f1f1 2741 case MAINTENANCE_IN:
e3d6f909 2742 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2743 /* MAINTENANCE_IN from SCC-2 */
2744 /*
2745 * Check for emulated MI_REPORT_TARGET_PGS.
2746 */
e76a35d6
CH		 2747 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2748 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2749 cmd->execute_task =
2750 target_emulate_report_target_port_groups;
c66ac9db
NB		 2751 }
2752 size = (cdb[6] << 24) | (cdb[7] << 16) |
2753 (cdb[8] << 8) | cdb[9];
2754 } else {
2755 /* GPCMD_SEND_KEY from multi media commands */
2756 size = (cdb[8] << 8) + cdb[9];
2757 }
05d1c7c0 2758 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2759 break;
2760 case MODE_SELECT:
2761 size = cdb[4];
2762 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2763 break;
2764 case MODE_SELECT_10:
2765 size = (cdb[7] << 8) + cdb[8];
2766 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2767 break;
2768 case MODE_SENSE:
2769 size = cdb[4];
05d1c7c0 2770 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2771 if (!passthrough)
2772 cmd->execute_task = target_emulate_modesense;
c66ac9db
NB		 2773 break;
2774 case MODE_SENSE_10:
5bda90c8
CH		 2775 size = (cdb[7] << 8) + cdb[8];
2776 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2777 if (!passthrough)
2778 cmd->execute_task = target_emulate_modesense;
2779 break;
c66ac9db
NB		 2780 case GPCMD_READ_BUFFER_CAPACITY:
2781 case GPCMD_SEND_OPC:
2782 case LOG_SELECT:
2783 case LOG_SENSE:
2784 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2785 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2786 break;
2787 case READ_BLOCK_LIMITS:
2788 size = READ_BLOCK_LEN;
05d1c7c0 2789 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2790 break;
2791 case GPCMD_GET_CONFIGURATION:
2792 case GPCMD_READ_FORMAT_CAPACITIES:
2793 case GPCMD_READ_DISC_INFO:
2794 case GPCMD_READ_TRACK_RZONE_INFO:
2795 size = (cdb[7] << 8) + cdb[8];
2796 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2797 break;
2798 case PERSISTENT_RESERVE_IN:
617c0e06 2799 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2800 cmd->execute_task = target_scsi3_emulate_pr_in;
617c0e06
CH		 2801 size = (cdb[7] << 8) + cdb[8];
2802 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2803 break;
c66ac9db 2804 case PERSISTENT_RESERVE_OUT:
617c0e06 2805 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2806 cmd->execute_task = target_scsi3_emulate_pr_out;
c66ac9db 2807 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2808 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2809 break;
2810 case GPCMD_MECHANISM_STATUS:
2811 case GPCMD_READ_DVD_STRUCTURE:
2812 size = (cdb[8] << 8) + cdb[9];
2813 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2814 break;
2815 case READ_POSITION:
2816 size = READ_POSITION_LEN;
05d1c7c0 2817 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2818 break;
e434f1f1 2819 case MAINTENANCE_OUT:
e3d6f909 2820 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2821 /* MAINTENANCE_OUT from SCC-2
2822 *
2823 * Check for emulated MO_SET_TARGET_PGS.
2824 */
e76a35d6
CH		 2825 if (cdb[1] == MO_SET_TARGET_PGS &&
2826 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2827 cmd->execute_task =
2828 target_emulate_set_target_port_groups;
c66ac9db
NB		 2829 }
2830
2831 size = (cdb[6] << 24) | (cdb[7] << 16) |
2832 (cdb[8] << 8) | cdb[9];
2833 } else {
2834 /* GPCMD_REPORT_KEY from multi media commands */
2835 size = (cdb[8] << 8) + cdb[9];
2836 }
05d1c7c0 2837 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2838 break;
2839 case INQUIRY:
2840 size = (cdb[3] << 8) + cdb[4];
2841 /*
2842 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2843 * See spc4r17 section 5.3
2844 */
5951146d 2845 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2846 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2847 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2848 if (!passthrough)
2849 cmd->execute_task = target_emulate_inquiry;
c66ac9db
NB		 2850 break;
2851 case READ_BUFFER:
2852 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2853 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2854 break;
2855 case READ_CAPACITY:
2856 size = READ_CAP_LEN;
05d1c7c0 2857 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2858 if (!passthrough)
2859 cmd->execute_task = target_emulate_readcapacity;
c66ac9db
NB		 2860 break;
2861 case READ_MEDIA_SERIAL_NUMBER:
2862 case SECURITY_PROTOCOL_IN:
2863 case SECURITY_PROTOCOL_OUT:
2864 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2865 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2866 break;
2867 case SERVICE_ACTION_IN:
5bda90c8
CH		 2868 switch (cmd->t_task_cdb[1] & 0x1f) {
2869 case SAI_READ_CAPACITY_16:
2870 if (!passthrough)
2871 cmd->execute_task =
2872 target_emulate_readcapacity_16;
2873 break;
2874 default:
2875 if (passthrough)
2876 break;
2877
2878 pr_err("Unsupported SA: 0x%02x\n",
2879 cmd->t_task_cdb[1] & 0x1f);
2880 goto out_unsupported_cdb;
2881 }
2882 /*FALLTHROUGH*/
c66ac9db
NB		 2883 case ACCESS_CONTROL_IN:
2884 case ACCESS_CONTROL_OUT:
2885 case EXTENDED_COPY:
2886 case READ_ATTRIBUTE:
2887 case RECEIVE_COPY_RESULTS:
2888 case WRITE_ATTRIBUTE:
2889 size = (cdb[10] << 24) | (cdb[11] << 16) |
2890 (cdb[12] << 8) | cdb[13];
05d1c7c0 2891 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2892 break;
2893 case RECEIVE_DIAGNOSTIC:
2894 case SEND_DIAGNOSTIC:
2895 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2896 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2897 break;
2898/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2899#if 0
2900 case GPCMD_READ_CD:
2901 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2902 size = (2336 * sectors);
05d1c7c0 2903 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2904 break;
2905#endif
2906 case READ_TOC:
2907 size = cdb[8];
05d1c7c0 2908 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2909 break;
2910 case REQUEST_SENSE:
2911 size = cdb[4];
05d1c7c0 2912 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2913 if (!passthrough)
2914 cmd->execute_task = target_emulate_request_sense;
c66ac9db
NB		 2915 break;
2916 case READ_ELEMENT_STATUS:
2917 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2918 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2919 break;
2920 case WRITE_BUFFER:
2921 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2922 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2923 break;
2924 case RESERVE:
2925 case RESERVE_10:
2926 /*
2927 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2928 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2929 */
2930 if (cdb[0] == RESERVE_10)
2931 size = (cdb[7] << 8) | cdb[8];
2932 else
2933 size = cmd->data_length;
2934
2935 /*
2936 * Setup the legacy emulated handler for SPC-2 and
2937 * >= SPC-3 compatible reservation handling (CRH=1)
2938 * Otherwise, we assume the underlying SCSI logic is
2939 * is running in SPC_PASSTHROUGH, and wants reservations
2940 * emulation disabled.
2941 */
e76a35d6
CH		 2942 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2943 cmd->execute_task = target_scsi2_reservation_reserve;
c66ac9db
NB		 2944 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2945 break;
2946 case RELEASE:
2947 case RELEASE_10:
2948 /*
2949 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2950 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2951 */
2952 if (cdb[0] == RELEASE_10)
2953 size = (cdb[7] << 8) | cdb[8];
2954 else
2955 size = cmd->data_length;
2956
e76a35d6
CH		 2957 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2958 cmd->execute_task = target_scsi2_reservation_release;
c66ac9db
NB		 2959 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2960 break;
2961 case SYNCHRONIZE_CACHE:
2962 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2963 /*
2964 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2965 */
2966 if (cdb[0] == SYNCHRONIZE_CACHE) {
2967 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2968 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2969 } else {
2970 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2971 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2972 }
2973 if (sector_ret)
2974 goto out_unsupported_cdb;
2975
2976 size = transport_get_size(sectors, cdb, cmd);
2977 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2978
5bda90c8 2979 if (passthrough)
c66ac9db 2980 break;
5bda90c8 2981
c66ac9db
NB		 2982 /*
2983 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 2984 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 2985 */
7abbe7f3
NB		 2986 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2987 if (transport_cmd_get_valid_sectors(cmd) < 0)
2988 goto out_invalid_cdb_field;
2989 }
5bda90c8 2990 cmd->execute_task = target_emulate_synchronize_cache;
c66ac9db
NB		 2991 break;
2992 case UNMAP:
2993 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 2994 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2995 if (!passthrough)
2996 cmd->execute_task = target_emulate_unmap;
c66ac9db
NB		 2997 break;
2998 case WRITE_SAME_16:
2999 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3000 if (sector_ret)
3001 goto out_unsupported_cdb;
dd3a5ad8 3002
6708bb27 3003 if (sectors)
12850626 3004 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3005 else {
3006 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3007 goto out_invalid_cdb_field;
3008 }
dd3a5ad8 3009
5db0753b 3010 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3011 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3012
3013 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3014 goto out_invalid_cdb_field;
5bda90c8
CH		 3015 if (!passthrough)
3016 cmd->execute_task = target_emulate_write_same;
706d5860
NB		 3017 break;
3018 case WRITE_SAME:
3019 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3020 if (sector_ret)
3021 goto out_unsupported_cdb;
3022
3023 if (sectors)
12850626 3024 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3025 else {
3026 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3027 goto out_invalid_cdb_field;
c66ac9db 3028 }
706d5860
NB		 3029
3030 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3031 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3032 /*
3033 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3034 * of byte 1 bit 3 UNMAP instead of original reserved field
3035 */
3036 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3037 goto out_invalid_cdb_field;
5bda90c8
CH		 3038 if (!passthrough)
3039 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 3040 break;
3041 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 3042 case ERASE:
c66ac9db
NB		 3043 case REZERO_UNIT:
3044 case SEEK_10:
c66ac9db
NB		 3045 case SPACE:
3046 case START_STOP:
3047 case TEST_UNIT_READY:
3048 case VERIFY:
3049 case WRITE_FILEMARKS:
5bda90c8
CH		 3050 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3051 if (!passthrough)
3052 cmd->execute_task = target_emulate_noop;
3053 break;
3054 case GPCMD_CLOSE_TRACK:
3055 case INITIALIZE_ELEMENT_STATUS:
3056 case GPCMD_LOAD_UNLOAD:
3057 case GPCMD_SET_SPEED:
c66ac9db
NB		 3058 case MOVE_MEDIUM:
3059 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3060 break;
3061 case REPORT_LUNS:
e76a35d6 3062 cmd->execute_task = target_report_luns;
c66ac9db
NB		 3063 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3064 /*
3065 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3066 * See spc4r17 section 5.3
3067 */
5951146d 3068 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3069 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3070 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3071 break;
3072 default:
6708bb27 3073 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3074 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3075 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3076 goto out_unsupported_cdb;
3077 }
3078
3079 if (size != cmd->data_length) {
6708bb27 3080 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3081 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3082 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3083 cmd->data_length, size, cdb[0]);
3084
3085 cmd->cmd_spdtl = size;
3086
3087 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3088 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3089 " WRITE data\n");
3090 goto out_invalid_cdb_field;
3091 }
3092 /*
3093 * Reject READ_* or WRITE_* with overflow/underflow for
3094 * type SCF_SCSI_DATA_SG_IO_CDB.
3095 */
6708bb27
AG		 3096 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3097 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3098 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3099 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3100 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3101 goto out_invalid_cdb_field;
3102 }
3103
3104 if (size > cmd->data_length) {
3105 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3106 cmd->residual_count = (size - cmd->data_length);
3107 } else {
3108 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3109 cmd->residual_count = (cmd->data_length - size);
3110 }
3111 cmd->data_length = size;
3112 }
3113
5bda90c8
CH		 3114 /* reject any command that we don't have a handler for */
3115 if (!(passthrough || cmd->execute_task ||
3116 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3117 goto out_unsupported_cdb;
3118
d0229ae3
AG		 3119 /* Let's limit control cdbs to a page, for simplicity's sake. */
3120 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3121 size > PAGE_SIZE)
3122 goto out_invalid_cdb_field;
3123
c66ac9db
NB		 3124 transport_set_supported_SAM_opcode(cmd);
3125 return ret;
3126
3127out_unsupported_cdb:
3128 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3129 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3130 return -EINVAL;
c66ac9db
NB		 3131out_invalid_cdb_field:
3132 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3133 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3134 return -EINVAL;
c66ac9db
NB		 3135}
3136
c66ac9db 3137/*
35e0e757 3138 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3139 * and ordered cmds need to have their tasks added to the execution queue.
3140 */
3141static void transport_complete_task_attr(struct se_cmd *cmd)
3142{
5951146d 3143 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3144 struct se_cmd *cmd_p, *cmd_tmp;
3145 int new_active_tasks = 0;
3146
e66ecd50 3147 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3148 atomic_dec(&dev->simple_cmds);
3149 smp_mb__after_atomic_dec();
3150 dev->dev_cur_ordered_id++;
6708bb27 3151 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3152 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3153 cmd->se_ordered_id);
e66ecd50 3154 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3155 dev->dev_cur_ordered_id++;
6708bb27 3156 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3157 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3158 cmd->se_ordered_id);
e66ecd50 3159 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3160 atomic_dec(&dev->dev_ordered_sync);
3161 smp_mb__after_atomic_dec();
c66ac9db
NB		 3162
3163 dev->dev_cur_ordered_id++;
6708bb27 3164 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3165 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3166 }
3167 /*
3168 * Process all commands up to the last received
3169 * ORDERED task attribute which requires another blocking
3170 * boundary
3171 */
3172 spin_lock(&dev->delayed_cmd_lock);
3173 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3174 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3175
5951146d 3176 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3177 spin_unlock(&dev->delayed_cmd_lock);
3178
6708bb27 3179 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3180 " cmd_p: 0x%02x Task Attr: 0x%02x"
3181 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3182 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3183 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3184
3185 transport_add_tasks_from_cmd(cmd_p);
3186 new_active_tasks++;
3187
3188 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3189 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3190 break;
3191 }
3192 spin_unlock(&dev->delayed_cmd_lock);
3193 /*
3194 * If new tasks have become active, wake up the transport thread
3195 * to do the processing of the Active tasks.
3196 */
3197 if (new_active_tasks != 0)
e3d6f909 3198 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3199}
3200
e057f533 3201static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3202{
3203 int ret = 0;
3204
e057f533
CH		 3205 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3206 transport_complete_task_attr(cmd);
3207
3208 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3209 ret = cmd->se_tfo->queue_status(cmd);
3210 if (ret)
3211 goto out;
3212 }
07bde79a
NB		 3213
3214 switch (cmd->data_direction) {
3215 case DMA_FROM_DEVICE:
3216 ret = cmd->se_tfo->queue_data_in(cmd);
3217 break;
3218 case DMA_TO_DEVICE:
ec98f782 3219 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3220 ret = cmd->se_tfo->queue_data_in(cmd);
3221 if (ret < 0)
e057f533 3222 break;
07bde79a
NB		 3223 }
3224 /* Fall through for DMA_TO_DEVICE */
3225 case DMA_NONE:
3226 ret = cmd->se_tfo->queue_status(cmd);
3227 break;
3228 default:
3229 break;
3230 }
3231
e057f533
CH		 3232out:
3233 if (ret < 0) {
3234 transport_handle_queue_full(cmd, cmd->se_dev);
3235 return;
3236 }
3237 transport_lun_remove_cmd(cmd);
3238 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3239}
3240
3241static void transport_handle_queue_full(
3242 struct se_cmd *cmd,
e057f533 3243 struct se_device *dev)
07bde79a
NB		 3244{
3245 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3246 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3247 atomic_inc(&dev->dev_qf_count);
3248 smp_mb__after_atomic_inc();
3249 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3250
3251 schedule_work(&cmd->se_dev->qf_work_queue);
3252}
3253
35e0e757 3254static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3255{
35e0e757 3256 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3257 int reason = 0, ret;
35e0e757 3258
c66ac9db
NB		 3259 /*
3260 * Check if we need to move delayed/dormant tasks from cmds on the
3261 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3262 * Attribute.
3263 */
5951146d 3264 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3265 transport_complete_task_attr(cmd);
07bde79a
NB		 3266 /*
3267 * Check to schedule QUEUE_FULL work, or execute an existing
3268 * cmd->transport_qf_callback()
3269 */
3270 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3271 schedule_work(&cmd->se_dev->qf_work_queue);
3272
c66ac9db
NB		 3273 /*
3274 * Check if we need to retrieve a sense buffer from
3275 * the struct se_cmd in question.
3276 */
3277 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3278 if (transport_get_sense_data(cmd) < 0)
3279 reason = TCM_NON_EXISTENT_LUN;
3280
3281 /*
3282 * Only set when an struct se_task->task_scsi_status returned
3283 * a non GOOD status.
3284 */
3285 if (cmd->scsi_status) {
07bde79a 3286 ret = transport_send_check_condition_and_sense(
c66ac9db 3287 cmd, reason, 1);
f147abb4 3288 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3289 goto queue_full;
3290
c66ac9db
NB		 3291 transport_lun_remove_cmd(cmd);
3292 transport_cmd_check_stop_to_fabric(cmd);
3293 return;
3294 }
3295 }
3296 /*
25985edc 3297 * Check for a callback, used by amongst other things
c66ac9db
NB		 3298 * XDWRITE_READ_10 emulation.
3299 */
3300 if (cmd->transport_complete_callback)
3301 cmd->transport_complete_callback(cmd);
3302
3303 switch (cmd->data_direction) {
3304 case DMA_FROM_DEVICE:
3305 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3306 if (cmd->se_lun->lun_sep) {
3307 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3308 cmd->data_length;
3309 }
3310 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3311
07bde79a 3312 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3313 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3314 goto queue_full;
c66ac9db
NB		 3315 break;
3316 case DMA_TO_DEVICE:
3317 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3318 if (cmd->se_lun->lun_sep) {
3319 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3320 cmd->data_length;
3321 }
3322 spin_unlock(&cmd->se_lun->lun_sep_lock);
3323 /*
3324 * Check if we need to send READ payload for BIDI-COMMAND
3325 */
ec98f782 3326 if (cmd->t_bidi_data_sg) {
c66ac9db 3327 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3328 if (cmd->se_lun->lun_sep) {
3329 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3330 cmd->data_length;
3331 }
3332 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3333 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3334 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3335 goto queue_full;
c66ac9db
NB		 3336 break;
3337 }
3338 /* Fall through for DMA_TO_DEVICE */
3339 case DMA_NONE:
07bde79a 3340 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3341 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3342 goto queue_full;
c66ac9db
NB		 3343 break;
3344 default:
3345 break;
3346 }
3347
3348 transport_lun_remove_cmd(cmd);
3349 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3350 return;
3351
3352queue_full:
6708bb27 3353 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3354 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3355 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3356 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3357}
3358
3359static void transport_free_dev_tasks(struct se_cmd *cmd)
3360{
3361 struct se_task *task, *task_tmp;
3362 unsigned long flags;
0c2cfe5f 3363 LIST_HEAD(dispose_list);
c66ac9db 3364
a1d8b49a 3365 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3366 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3367 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3368 if (!(task->task_flags & TF_ACTIVE))
3369 list_move_tail(&task->t_list, &dispose_list);
3370 }
3371 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3372
3373 while (!list_empty(&dispose_list)) {
3374 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3375
af3f00c7
CH		 3376 if (task->task_sg != cmd->t_data_sg &&
3377 task->task_sg != cmd->t_bidi_data_sg)
3378 kfree(task->task_sg);
c66ac9db
NB		 3379
3380 list_del(&task->t_list);
3381
42bf829e 3382 cmd->se_dev->transport->free_task(task);
c66ac9db 3383 }
c66ac9db
NB		 3384}
3385
6708bb27 3386static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3387{
ec98f782 3388 struct scatterlist *sg;
ec98f782 3389 int count;
c66ac9db 3390
6708bb27
AG		 3391 for_each_sg(sgl, sg, nents, count)
3392 __free_page(sg_page(sg));
c66ac9db 3393
6708bb27
AG		 3394 kfree(sgl);
3395}
c66ac9db 3396
6708bb27
AG		 3397static inline void transport_free_pages(struct se_cmd *cmd)
3398{
3399 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3400 return;
3401
3402 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3403 cmd->t_data_sg = NULL;
3404 cmd->t_data_nents = 0;
c66ac9db 3405
6708bb27 3406 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3407 cmd->t_bidi_data_sg = NULL;
3408 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3409}
3410
e26d99ae
CH		 3411/**
3412 * transport_release_cmd - free a command
3413 * @cmd: command to free
3414 *
3415 * This routine unconditionally frees a command, and reference counting
3416 * or list removal must be done in the caller.
3417 */
3418static void transport_release_cmd(struct se_cmd *cmd)
3419{
3420 BUG_ON(!cmd->se_tfo);
3421
3422 if (cmd->se_tmr_req)
3423 core_tmr_release_req(cmd->se_tmr_req);
3424 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3425 kfree(cmd->t_task_cdb);
3426 /*
7481deb4
NB		 3427 * If this cmd has been setup with target_get_sess_cmd(), drop
3428 * the kref and call ->release_cmd() in kref callback.
e26d99ae 3429 */
7481deb4
NB		 3430 if (cmd->check_release != 0) {
3431 target_put_sess_cmd(cmd->se_sess, cmd);
3432 return;
3433 }
e26d99ae
CH		 3434 cmd->se_tfo->release_cmd(cmd);
3435}
3436
d3df7825
CH		 3437/**
3438 * transport_put_cmd - release a reference to a command
3439 * @cmd: command to release
3440 *
3441 * This routine releases our reference to the command and frees it if possible.
3442 */
39c05f32 3443static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3444{
3445 unsigned long flags;
4911e3cc 3446 int free_tasks = 0;
c66ac9db 3447
a1d8b49a 3448 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3449 if (atomic_read(&cmd->t_fe_count)) {
3450 if (!atomic_dec_and_test(&cmd->t_fe_count))
3451 goto out_busy;
3452 }
3453
3454 if (atomic_read(&cmd->t_se_count)) {
3455 if (!atomic_dec_and_test(&cmd->t_se_count))
3456 goto out_busy;
3457 }
3458
3459 if (atomic_read(&cmd->transport_dev_active)) {
3460 atomic_set(&cmd->transport_dev_active, 0);
3461 transport_all_task_dev_remove_state(cmd);
3462 free_tasks = 1;
c66ac9db 3463 }
a1d8b49a 3464 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3465
4911e3cc
CH		 3466 if (free_tasks != 0)
3467 transport_free_dev_tasks(cmd);
d3df7825 3468
c66ac9db 3469 transport_free_pages(cmd);
31afc39c 3470 transport_release_cmd(cmd);
39c05f32 3471 return;
4911e3cc
CH		 3472out_busy:
3473 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3474}
3475
c66ac9db 3476/*
ec98f782
AG		 3477 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3478 * allocating in the core.
c66ac9db
NB		 3479 * @cmd: Associated se_cmd descriptor
3480 * @mem: SGL style memory for TCM WRITE / READ
3481 * @sg_mem_num: Number of SGL elements
3482 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3483 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3484 *
3485 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3486 * of parameters.
3487 */
3488int transport_generic_map_mem_to_cmd(
3489 struct se_cmd *cmd,
5951146d
AG		 3490 struct scatterlist *sgl,
3491 u32 sgl_count,
3492 struct scatterlist *sgl_bidi,
3493 u32 sgl_bidi_count)
c66ac9db 3494{
5951146d 3495 if (!sgl || !sgl_count)
c66ac9db 3496 return 0;
c66ac9db 3497
c66ac9db
NB		 3498 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3499 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
fef58a60
NB		 3500 /*
3501 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3502 * scatterlists already have been set to follow what the fabric
3503 * passes for the original expected data transfer length.
3504 */
3505 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3506 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3507 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3508 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3509 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3510 return -EINVAL;
3511 }
c66ac9db 3512
ec98f782
AG		 3513 cmd->t_data_sg = sgl;
3514 cmd->t_data_nents = sgl_count;
c66ac9db 3515
ec98f782
AG		 3516 if (sgl_bidi && sgl_bidi_count) {
3517 cmd->t_bidi_data_sg = sgl_bidi;
3518 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3519 }
3520 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3521 }
3522
3523 return 0;
3524}
3525EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3526
05d1c7c0
AG		 3527void *transport_kmap_first_data_page(struct se_cmd *cmd)
3528{
ec98f782 3529 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3530
ec98f782 3531 BUG_ON(!sg);
05d1c7c0 3532 /*
ec98f782
AG		 3533 * We need to take into account a possible offset here for fabrics like
3534 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3535 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3536 */
ec98f782 3537 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3538}
3539EXPORT_SYMBOL(transport_kmap_first_data_page);
3540
3541void transport_kunmap_first_data_page(struct se_cmd *cmd)
3542{
ec98f782 3543 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3544}
3545EXPORT_SYMBOL(transport_kunmap_first_data_page);
3546
c66ac9db 3547static int
05d1c7c0 3548transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3549{
ec98f782
AG		 3550 u32 length = cmd->data_length;
3551 unsigned int nents;
3552 struct page *page;
3553 int i = 0;
c66ac9db 3554
ec98f782
AG		 3555 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3556 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3557 if (!cmd->t_data_sg)
3558 return -ENOMEM;
c66ac9db 3559
ec98f782
AG		 3560 cmd->t_data_nents = nents;
3561 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3562
ec98f782
AG		 3563 while (length) {
3564 u32 page_len = min_t(u32, length, PAGE_SIZE);
3565 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3566 if (!page)
3567 goto out;
c66ac9db 3568
ec98f782
AG		 3569 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3570 length -= page_len;
3571 i++;
c66ac9db 3572 }
c66ac9db 3573 return 0;
c66ac9db 3574
ec98f782
AG		 3575out:
3576 while (i >= 0) {
3577 __free_page(sg_page(&cmd->t_data_sg[i]));
3578 i--;
c66ac9db 3579 }
ec98f782
AG		 3580 kfree(cmd->t_data_sg);
3581 cmd->t_data_sg = NULL;
3582 return -ENOMEM;
c66ac9db
NB		 3583}
3584
a1d8b49a
AG		 3585/* Reduce sectors if they are too long for the device */
3586static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3587 struct se_device *dev,
3588 unsigned long long lba,
a1d8b49a 3589 sector_t sectors)
c66ac9db 3590{
a1d8b49a 3591 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3592
a1d8b49a
AG		 3593 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3594 if ((lba + sectors) > transport_dev_end_lba(dev))
3595 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3596
a1d8b49a 3597 return sectors;
c66ac9db
NB		 3598}
3599
c66ac9db
NB		 3600
3601/*
3602 * This function can be used by HW target mode drivers to create a linked
3603 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3604 * This is intended to be called during the completion path by TCM Core
3605 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3606 */
3607void transport_do_task_sg_chain(struct se_cmd *cmd)
3608{
ec98f782
AG		 3609 struct scatterlist *sg_first = NULL;
3610 struct scatterlist *sg_prev = NULL;
3611 int sg_prev_nents = 0;
3612 struct scatterlist *sg;
c66ac9db 3613 struct se_task *task;
ec98f782 3614 u32 chained_nents = 0;
c66ac9db
NB		 3615 int i;
3616
ec98f782
AG		 3617 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3618
c66ac9db
NB		 3619 /*
3620 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3621 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3622 */
a1d8b49a 3623 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3624 if (!task->task_sg)
c66ac9db
NB		 3625 continue;
3626
ec98f782
AG		 3627 if (!sg_first) {
3628 sg_first = task->task_sg;
6708bb27 3629 chained_nents = task->task_sg_nents;
97868c89 3630 } else {
ec98f782 3631 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3632 chained_nents += task->task_sg_nents;
97868c89 3633 }
c3c74c7a
NB		 3634 /*
3635 * For the padded tasks, use the extra SGL vector allocated
3636 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3637 * offset into sg_chain() above.
3638 *
3639 * We do not need the padding for the last task (or a single
3640 * task), but in that case we will never use the sg_prev_nents
3641 * value below which would be incorrect.
c3c74c7a 3642 */
04629b7b 3643 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3644 sg_prev = task->task_sg;
c66ac9db
NB		 3645 }
3646 /*
3647 * Setup the starting pointer and total t_tasks_sg_linked_no including
3648 * padding SGs for linking and to mark the end.
3649 */
a1d8b49a 3650 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3651 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3652
6708bb27 3653 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3654 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3655 cmd->t_tasks_sg_chained_no);
c66ac9db 3656
a1d8b49a
AG		 3657 for_each_sg(cmd->t_tasks_sg_chained, sg,
3658 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3659
6708bb27 3660 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3661 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3662 if (sg_is_chain(sg))
6708bb27 3663 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3664 if (sg_is_last(sg))
6708bb27 3665 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3666 }
c66ac9db
NB		 3667}
3668EXPORT_SYMBOL(transport_do_task_sg_chain);
3669
a1d8b49a
AG		 3670/*
3671 * Break up cmd into chunks transport can handle
3672 */
38b40067
CH		 3673static int
3674transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3675 enum dma_data_direction data_direction,
38b40067 3676 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3677{
5951146d 3678 struct se_device *dev = cmd->se_dev;
a3eedc22 3679 int task_count, i;
38b40067
CH		 3680 unsigned long long lba;
3681 sector_t sectors, dev_max_sectors;
3682 u32 sector_size;
3683
3684 if (transport_cmd_get_valid_sectors(cmd) < 0)
3685 return -EINVAL;
3686
3687 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3688 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
a1d8b49a 3689
ec98f782 3690 WARN_ON(cmd->data_length % sector_size);
38b40067
CH		 3691
3692 lba = cmd->t_task_lba;
ec98f782 3693 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27 3694 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
af3f00c7
CH		 3695
3696 /*
3697 * If we need just a single task reuse the SG list in the command
3698 * and avoid a lot of work.
3699 */
3700 if (task_count == 1) {
3701 struct se_task *task;
3702 unsigned long flags;
3703
3704 task = transport_generic_get_task(cmd, data_direction);
3705 if (!task)
3706 return -ENOMEM;
3707
3708 task->task_sg = cmd_sg;
3709 task->task_sg_nents = sgl_nents;
3710
3711 task->task_lba = lba;
3712 task->task_sectors = sectors;
3713 task->task_size = task->task_sectors * sector_size;
3714
3715 spin_lock_irqsave(&cmd->t_state_lock, flags);
3716 list_add_tail(&task->t_list, &cmd->t_task_list);
3717 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3718
3719 return task_count;
3720 }
3721
ec98f782 3722 for (i = 0; i < task_count; i++) {
38b40067 3723 struct se_task *task;
c3c74c7a 3724 unsigned int task_size, task_sg_nents_padded;
38b40067
CH		 3725 struct scatterlist *sg;
3726 unsigned long flags;
ec98f782 3727 int count;
a1d8b49a 3728
c66ac9db 3729 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3730 if (!task)
ec98f782 3731 return -ENOMEM;
c66ac9db 3732
c66ac9db 3733 task->task_lba = lba;
ec98f782
AG		 3734 task->task_sectors = min(sectors, dev_max_sectors);
3735 task->task_size = task->task_sectors * sector_size;
c66ac9db 3736
525a48a2
NB		 3737 /*
3738 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3739 * in order to calculate the number per task SGL entries
3740 */
3741 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3742 /*
ec98f782
AG		 3743 * Check if the fabric module driver is requesting that all
3744 * struct se_task->task_sg[] be chained together.. If so,
3745 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3746 * marking the end of the chained SGL for every task except
3747 * the last one for (task_count > 1) operation, or skipping
3748 * the extra padding for the (task_count == 1) case.
c66ac9db 3749 */
c3c74c7a
NB		 3750 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3751 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3752 } else
3753 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3754
1d20bb61 3755 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3756 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3757 if (!task->task_sg) {
3758 cmd->se_dev->transport->free_task(task);
3759 return -ENOMEM;
3760 }
3761
c3c74c7a 3762 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3763
ec98f782
AG		 3764 task_size = task->task_size;
3765
3766 /* Build new sgl, only up to task_size */
6708bb27 3767 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3768 if (cmd_sg->length > task_size)
3769 break;
3770
3771 *sg = *cmd_sg;
3772 task_size -= cmd_sg->length;
3773 cmd_sg = sg_next(cmd_sg);
c66ac9db 3774 }
c66ac9db 3775
ec98f782
AG		 3776 lba += task->task_sectors;
3777 sectors -= task->task_sectors;
c66ac9db 3778
ec98f782
AG		 3779 spin_lock_irqsave(&cmd->t_state_lock, flags);
3780 list_add_tail(&task->t_list, &cmd->t_task_list);
3781 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3782 }
3783
ec98f782 3784 return task_count;
c66ac9db
NB		 3785}
3786
3787static int
ec98f782 3788transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3789{
c66ac9db 3790 struct se_task *task;
ec98f782 3791 unsigned long flags;
c66ac9db
NB		 3792
3793 task = transport_generic_get_task(cmd, cmd->data_direction);
3794 if (!task)
ec98f782 3795 return -ENOMEM;
c66ac9db 3796
af3f00c7 3797 task->task_sg = cmd->t_data_sg;
c66ac9db 3798 task->task_size = cmd->data_length;
6708bb27 3799 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3800
ec98f782
AG		 3801 spin_lock_irqsave(&cmd->t_state_lock, flags);
3802 list_add_tail(&task->t_list, &cmd->t_task_list);
3803 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3804
6708bb27 3805 /* Success! Return number of tasks allocated */
a3eedc22 3806 return 1;
ec98f782
AG		 3807}
3808
da0f7619
CH		 3809/*
3810 * Allocate any required ressources to execute the command, and either place
3811 * it on the execution queue if possible. For writes we might not have the
3812 * payload yet, thus notify the fabric via a call to ->write_pending instead.
c66ac9db 3813 */
a1d8b49a 3814int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3815{
da0f7619 3816 struct se_device *dev = cmd->se_dev;
9ac54987 3817 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3818 int set_counts = 1;
c66ac9db
NB		 3819 int ret = 0;
3820
3821 /*
3822 * Determine is the TCM fabric module has already allocated physical
3823 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3824 * beforehand.
c66ac9db 3825 */
ec98f782
AG		 3826 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3827 cmd->data_length) {
05d1c7c0 3828 ret = transport_generic_get_mem(cmd);
c66ac9db 3829 if (ret < 0)
03e98c9e 3830 goto out_fail;
c66ac9db 3831 }
da0f7619 3832
1d20bb61 3833 /*
38b40067 3834 * For BIDI command set up the read tasks first.
1d20bb61 3835 */
da0f7619 3836 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3837 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3838 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3839
9ac54987
NB		 3840 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3841 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3842 cmd->t_bidi_data_nents);
3843 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3844 goto out_fail;
3845
3846 atomic_inc(&cmd->t_fe_count);
3847 atomic_inc(&cmd->t_se_count);
3848 set_counts = 0;
3849 }
38b40067
CH		 3850
3851 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3852 task_cdbs = transport_allocate_data_tasks(cmd,
3853 cmd->data_direction, cmd->t_data_sg,
3854 cmd->t_data_nents);
3855 } else {
3856 task_cdbs = transport_allocate_control_task(cmd);
3857 }
3858
410f6702 3859 if (task_cdbs < 0)
da0f7619 3860 goto out_fail;
410f6702
RD		 3861 else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3862 cmd->t_state = TRANSPORT_COMPLETE;
3863 atomic_set(&cmd->t_transport_active, 1);
3864 INIT_WORK(&cmd->work, target_complete_ok_work);
3865 queue_work(target_completion_wq, &cmd->work);
3866 return 0;
3867 }
da0f7619
CH		 3868
3869 if (set_counts) {
3870 atomic_inc(&cmd->t_fe_count);
3871 atomic_inc(&cmd->t_se_count);
3872 }
3873
9ac54987
NB		 3874 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3875 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3876 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3877
c66ac9db 3878 /*
a1d8b49a 3879 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3880 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3881 * will be added to the struct se_device execution queue after its WRITE
3882 * data has arrived. (ie: It gets handled by the transport processing
3883 * thread a second time)
3884 */
3885 if (cmd->data_direction == DMA_TO_DEVICE) {
3886 transport_add_tasks_to_state_queue(cmd);
3887 return transport_generic_write_pending(cmd);
3888 }
3889 /*
3890 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3891 * to the execution queue.
3892 */
3893 transport_execute_tasks(cmd);
3894 return 0;
da0f7619
CH		 3895
3896out_fail:
3897 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3898 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3899 return -EINVAL;
c66ac9db 3900}
a1d8b49a 3901EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3902
3903/* transport_generic_process_write():
3904 *
3905 *
3906 */
3907void transport_generic_process_write(struct se_cmd *cmd)
3908{
c66ac9db
NB		 3909 transport_execute_tasks(cmd);
3910}
3911EXPORT_SYMBOL(transport_generic_process_write);
3912
e057f533 3913static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3914{
f147abb4
NB		 3915 int ret;
3916
3917 ret = cmd->se_tfo->write_pending(cmd);
3918 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3919 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3920 cmd);
3921 transport_handle_queue_full(cmd, cmd->se_dev);
3922 }
07bde79a
NB		 3923}
3924
c66ac9db
NB		 3925static int transport_generic_write_pending(struct se_cmd *cmd)
3926{
3927 unsigned long flags;
3928 int ret;
3929
a1d8b49a 3930 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3931 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3932 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3933
c66ac9db
NB		 3934 /*
3935 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 3936 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 3937 * can be called from HW target mode interrupt code. This is safe
e3d6f909 3938 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3939 * because the se_cmd->se_lun pointer is not being cleared.
3940 */
3941 transport_cmd_check_stop(cmd, 1, 0);
3942
3943 /*
3944 * Call the fabric write_pending function here to let the
3945 * frontend know that WRITE buffers are ready.
3946 */
e3d6f909 3947 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3948 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3949 goto queue_full;
3950 else if (ret < 0)
c66ac9db
NB		 3951 return ret;
3952
03e98c9e 3953 return 1;
07bde79a
NB		 3954
3955queue_full:
6708bb27 3956 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3957 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3958 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3959 return 0;
c66ac9db
NB		 3960}
3961
39c05f32 3962void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3963{
d14921d6
NB		 3964 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3965 if (wait_for_tasks && cmd->se_tmr_req)
3966 transport_wait_for_tasks(cmd);
3967
35462975 3968 transport_release_cmd(cmd);
d14921d6
NB		 3969 } else {
3970 if (wait_for_tasks)
3971 transport_wait_for_tasks(cmd);
3972
c66ac9db
NB		 3973 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3974
82f1c8a4 3975 if (cmd->se_lun)
c66ac9db 3976 transport_lun_remove_cmd(cmd);
c66ac9db 3977
f4366772
NB		 3978 transport_free_dev_tasks(cmd);
3979
39c05f32 3980 transport_put_cmd(cmd);
c66ac9db
NB		 3981 }
3982}
3983EXPORT_SYMBOL(transport_generic_free_cmd);
3984
a17f091d
NB		 3985/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3986 * @se_sess: session to reference
3987 * @se_cmd: command descriptor to add
a6360785 3988 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 3989 */
a6360785
NB		 3990void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3991 bool ack_kref)
a17f091d
NB		 3992{
3993 unsigned long flags;
3994
7481deb4 3995 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 3996 /*
3997 * Add a second kref if the fabric caller is expecting to handle
3998 * fabric acknowledgement that requires two target_put_sess_cmd()
3999 * invocations before se_cmd descriptor release.
4000 */
4001 if (ack_kref == true)
4002 kref_get(&se_cmd->cmd_kref);
7481deb4 4003
a17f091d
NB		 4004 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4005 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
4006 se_cmd->check_release = 1;
4007 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4008}
4009EXPORT_SYMBOL(target_get_sess_cmd);
4010
7481deb4 4011static void target_release_cmd_kref(struct kref *kref)
a17f091d 4012{
7481deb4
NB		 4013 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
4014 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 4015 unsigned long flags;
4016
4017 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4018 if (list_empty(&se_cmd->se_cmd_list)) {
4019 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4020 WARN_ON(1);
7481deb4 4021 return;
a17f091d 4022 }
a17f091d
NB		 4023 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
4024 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4025 complete(&se_cmd->cmd_wait_comp);
7481deb4 4026 return;
a17f091d
NB		 4027 }
4028 list_del(&se_cmd->se_cmd_list);
4029 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4030
7481deb4
NB		 4031 se_cmd->se_tfo->release_cmd(se_cmd);
4032}
4033
4034/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4035 * @se_sess: session to reference
4036 * @se_cmd: command descriptor to drop
4037 */
4038int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4039{
4040 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 4041}
4042EXPORT_SYMBOL(target_put_sess_cmd);
4043
4044/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4045 * @se_sess: session to split
4046 */
4047void target_splice_sess_cmd_list(struct se_session *se_sess)
4048{
4049 struct se_cmd *se_cmd;
4050 unsigned long flags;
4051
4052 WARN_ON(!list_empty(&se_sess->sess_wait_list));
4053 INIT_LIST_HEAD(&se_sess->sess_wait_list);
4054
4055 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4056 se_sess->sess_tearing_down = 1;
4057
4058 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4059
4060 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4061 se_cmd->cmd_wait_set = 1;
4062
4063 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4064}
4065EXPORT_SYMBOL(target_splice_sess_cmd_list);
4066
4067/* target_wait_for_sess_cmds - Wait for outstanding descriptors
4068 * @se_sess: session to wait for active I/O
4069 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4070 */
4071void target_wait_for_sess_cmds(
4072 struct se_session *se_sess,
4073 int wait_for_tasks)
4074{
4075 struct se_cmd *se_cmd, *tmp_cmd;
4076 bool rc = false;
4077
4078 list_for_each_entry_safe(se_cmd, tmp_cmd,
4079 &se_sess->sess_wait_list, se_cmd_list) {
4080 list_del(&se_cmd->se_cmd_list);
4081
4082 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4083 " %d\n", se_cmd, se_cmd->t_state,
4084 se_cmd->se_tfo->get_cmd_state(se_cmd));
4085
4086 if (wait_for_tasks) {
4087 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4088 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4089 se_cmd->se_tfo->get_cmd_state(se_cmd));
4090
4091 rc = transport_wait_for_tasks(se_cmd);
4092
4093 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4094 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4095 se_cmd->se_tfo->get_cmd_state(se_cmd));
4096 }
4097
4098 if (!rc) {
4099 wait_for_completion(&se_cmd->cmd_wait_comp);
4100 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4101 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4102 se_cmd->se_tfo->get_cmd_state(se_cmd));
4103 }
4104
4105 se_cmd->se_tfo->release_cmd(se_cmd);
4106 }
4107}
4108EXPORT_SYMBOL(target_wait_for_sess_cmds);
4109
c66ac9db
NB		 4110/* transport_lun_wait_for_tasks():
4111 *
4112 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4113 * an struct se_lun to be successfully shutdown.
4114 */
4115static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4116{
4117 unsigned long flags;
4118 int ret;
4119 /*
4120 * If the frontend has already requested this struct se_cmd to
4121 * be stopped, we can safely ignore this struct se_cmd.
4122 */
a1d8b49a
AG		 4123 spin_lock_irqsave(&cmd->t_state_lock, flags);
4124 if (atomic_read(&cmd->t_transport_stop)) {
4125 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4126 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4127 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4128 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4129 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4130 return -EPERM;
c66ac9db 4131 }
a1d8b49a
AG		 4132 atomic_set(&cmd->transport_lun_fe_stop, 1);
4133 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4134
5951146d 4135 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4136
4137 ret = transport_stop_tasks_for_cmd(cmd);
4138
6708bb27
AG		 4139 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4140 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4141 if (!ret) {
6708bb27 4142 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4143 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4144 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4145 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4146 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4147 }
3df8d40b 4148 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4149
4150 return 0;
4151}
4152
c66ac9db
NB		 4153static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4154{
4155 struct se_cmd *cmd = NULL;
4156 unsigned long lun_flags, cmd_flags;
4157 /*
4158 * Do exception processing and return CHECK_CONDITION status to the
4159 * Initiator Port.
4160 */
4161 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4162 while (!list_empty(&lun->lun_cmd_list)) {
4163 cmd = list_first_entry(&lun->lun_cmd_list,
4164 struct se_cmd, se_lun_node);
4165 list_del(&cmd->se_lun_node);
4166
a1d8b49a 4167 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4168 /*
4169 * This will notify iscsi_target_transport.c:
4170 * transport_cmd_check_stop() that a LUN shutdown is in
4171 * progress for the iscsi_cmd_t.
4172 */
a1d8b49a 4173 spin_lock(&cmd->t_state_lock);
6708bb27 4174 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4175 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4176 cmd->se_lun->unpacked_lun,
4177 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4178 atomic_set(&cmd->transport_lun_stop, 1);
4179 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4180
4181 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4182
6708bb27
AG		 4183 if (!cmd->se_lun) {
4184 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4185 cmd->se_tfo->get_task_tag(cmd),
4186 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4187 BUG();
4188 }
4189 /*
4190 * If the Storage engine still owns the iscsi_cmd_t, determine
4191 * and/or stop its context.
4192 */
6708bb27 4193 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4194 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4195 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4196
e3d6f909 4197 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4198 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4199 continue;
4200 }
4201
6708bb27 4202 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4203 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4204 cmd->se_lun->unpacked_lun,
4205 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4206
a1d8b49a 4207 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4208 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4209 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4210 goto check_cond;
4211 }
a1d8b49a 4212 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4213 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4214 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4215
4216 transport_free_dev_tasks(cmd);
4217 /*
4218 * The Storage engine stopped this struct se_cmd before it was
4219 * send to the fabric frontend for delivery back to the
4220 * Initiator Node. Return this SCSI CDB back with an
4221 * CHECK_CONDITION status.
4222 */
4223check_cond:
4224 transport_send_check_condition_and_sense(cmd,
4225 TCM_NON_EXISTENT_LUN, 0);
4226 /*
4227 * If the fabric frontend is waiting for this iscsi_cmd_t to
4228 * be released, notify the waiting thread now that LU has
4229 * finished accessing it.
4230 */
a1d8b49a
AG		 4231 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4232 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4233 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4234 " struct se_cmd: %p ITT: 0x%08x\n",
4235 lun->unpacked_lun,
e3d6f909 4236 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4237
a1d8b49a 4238 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4239 cmd_flags);
4240 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4241 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4242 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4243 continue;
4244 }
6708bb27 4245 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4246 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4247
a1d8b49a 4248 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4249 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4250 }
4251 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4252}
4253
4254static int transport_clear_lun_thread(void *p)
4255{
8359cf43 4256 struct se_lun *lun = p;
c66ac9db
NB		 4257
4258 __transport_clear_lun_from_sessions(lun);
4259 complete(&lun->lun_shutdown_comp);
4260
4261 return 0;
4262}
4263
4264int transport_clear_lun_from_sessions(struct se_lun *lun)
4265{
4266 struct task_struct *kt;
4267
5951146d 4268 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4269 "tcm_cl_%u", lun->unpacked_lun);
4270 if (IS_ERR(kt)) {
6708bb27 4271 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4272 return PTR_ERR(kt);
c66ac9db
NB		 4273 }
4274 wait_for_completion(&lun->lun_shutdown_comp);
4275
4276 return 0;
4277}
4278
d14921d6
NB		 4279/**
4280 * transport_wait_for_tasks - wait for completion to occur
4281 * @cmd: command to wait
c66ac9db 4282 *
d14921d6
NB		 4283 * Called from frontend fabric context to wait for storage engine
4284 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4285 */
a17f091d 4286bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4287{
4288 unsigned long flags;
4289
a1d8b49a 4290 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4291 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4292 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4293 return false;
d14921d6
NB		 4294 }
4295 /*
4296 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4297 * has been set in transport_set_supported_SAM_opcode().
4298 */
4299 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4300 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4301 return false;
d14921d6 4302 }
c66ac9db
NB		 4303 /*
4304 * If we are already stopped due to an external event (ie: LUN shutdown)
4305 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4306 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4307 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4308 * has completed its operation on the struct se_cmd.
4309 */
a1d8b49a 4310 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4311
6708bb27 4312 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4313 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4314 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4315 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4316 /*
4317 * There is a special case for WRITES where a FE exception +
4318 * LUN shutdown means ConfigFS context is still sleeping on
4319 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4320 * We go ahead and up transport_lun_stop_comp just to be sure
4321 * here.
4322 */
a1d8b49a
AG		 4323 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4324 complete(&cmd->transport_lun_stop_comp);
4325 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4326 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4327
4328 transport_all_task_dev_remove_state(cmd);
4329 /*
4330 * At this point, the frontend who was the originator of this
4331 * struct se_cmd, now owns the structure and can be released through
4332 * normal means below.
4333 */
6708bb27 4334 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4335 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4336 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4337 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4338
a1d8b49a 4339 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4340 }
a1d8b49a 4341 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4342 atomic_read(&cmd->t_transport_aborted)) {
4343 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4344 return false;
d14921d6 4345 }
c66ac9db 4346
a1d8b49a 4347 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4348
6708bb27 4349 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
f2da9dbd
CH		 4350 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4351 cmd, cmd->se_tfo->get_task_tag(cmd),
4352 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4353
a1d8b49a 4354 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4355
5951146d 4356 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4357
a1d8b49a 4358 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4359
a1d8b49a
AG		 4360 spin_lock_irqsave(&cmd->t_state_lock, flags);
4361 atomic_set(&cmd->t_transport_active, 0);
4362 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4363
6708bb27 4364 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4365 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4366 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4367
d14921d6 4368 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4369
4370 return true;
c66ac9db 4371}
d14921d6 4372EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4373
4374static int transport_get_sense_codes(
4375 struct se_cmd *cmd,
4376 u8 *asc,
4377 u8 *ascq)
4378{
4379 *asc = cmd->scsi_asc;
4380 *ascq = cmd->scsi_ascq;
4381
4382 return 0;
4383}
4384
4385static int transport_set_sense_codes(
4386 struct se_cmd *cmd,
4387 u8 asc,
4388 u8 ascq)
4389{
4390 cmd->scsi_asc = asc;
4391 cmd->scsi_ascq = ascq;
4392
4393 return 0;
4394}
4395
4396int transport_send_check_condition_and_sense(
4397 struct se_cmd *cmd,
4398 u8 reason,
4399 int from_transport)
4400{
4401 unsigned char *buffer = cmd->sense_buffer;
4402 unsigned long flags;
4403 int offset;
4404 u8 asc = 0, ascq = 0;
4405
a1d8b49a 4406 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4407 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4408 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4409 return 0;
4410 }
4411 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4412 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4413
4414 if (!reason && from_transport)
4415 goto after_reason;
4416
4417 if (!from_transport)
4418 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4419 /*
4420 * Data Segment and SenseLength of the fabric response PDU.
4421 *
4422 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4423 * from include/scsi/scsi_cmnd.h
4424 */
e3d6f909 4425 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4426 TRANSPORT_SENSE_BUFFER);
4427 /*
4428 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4429 * SENSE KEY values from include/scsi/scsi.h
4430 */
4431 switch (reason) {
4432 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4433 /* CURRENT ERROR */
4434 buffer[offset] = 0x70;
4435 /* ILLEGAL REQUEST */
4436 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4437 /* LOGICAL UNIT NOT SUPPORTED */
4438 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4439 break;
c66ac9db
NB		 4440 case TCM_UNSUPPORTED_SCSI_OPCODE:
4441 case TCM_SECTOR_COUNT_TOO_MANY:
4442 /* CURRENT ERROR */
4443 buffer[offset] = 0x70;
4444 /* ILLEGAL REQUEST */
4445 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4446 /* INVALID COMMAND OPERATION CODE */
4447 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4448 break;
4449 case TCM_UNKNOWN_MODE_PAGE:
4450 /* CURRENT ERROR */
4451 buffer[offset] = 0x70;
4452 /* ILLEGAL REQUEST */
4453 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4454 /* INVALID FIELD IN CDB */
4455 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4456 break;
4457 case TCM_CHECK_CONDITION_ABORT_CMD:
4458 /* CURRENT ERROR */
4459 buffer[offset] = 0x70;
4460 /* ABORTED COMMAND */
4461 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4462 /* BUS DEVICE RESET FUNCTION OCCURRED */
4463 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4464 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4465 break;
4466 case TCM_INCORRECT_AMOUNT_OF_DATA:
4467 /* CURRENT ERROR */
4468 buffer[offset] = 0x70;
4469 /* ABORTED COMMAND */
4470 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4471 /* WRITE ERROR */
4472 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4473 /* NOT ENOUGH UNSOLICITED DATA */
4474 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4475 break;
4476 case TCM_INVALID_CDB_FIELD:
4477 /* CURRENT ERROR */
4478 buffer[offset] = 0x70;
4479 /* ABORTED COMMAND */
4480 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4481 /* INVALID FIELD IN CDB */
4482 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4483 break;
4484 case TCM_INVALID_PARAMETER_LIST:
4485 /* CURRENT ERROR */
4486 buffer[offset] = 0x70;
4487 /* ABORTED COMMAND */
4488 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4489 /* INVALID FIELD IN PARAMETER LIST */
4490 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4491 break;
4492 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4493 /* CURRENT ERROR */
4494 buffer[offset] = 0x70;
4495 /* ABORTED COMMAND */
4496 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4497 /* WRITE ERROR */
4498 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4499 /* UNEXPECTED_UNSOLICITED_DATA */
4500 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4501 break;
4502 case TCM_SERVICE_CRC_ERROR:
4503 /* CURRENT ERROR */
4504 buffer[offset] = 0x70;
4505 /* ABORTED COMMAND */
4506 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4507 /* PROTOCOL SERVICE CRC ERROR */
4508 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4509 /* N/A */
4510 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4511 break;
4512 case TCM_SNACK_REJECTED:
4513 /* CURRENT ERROR */
4514 buffer[offset] = 0x70;
4515 /* ABORTED COMMAND */
4516 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4517 /* READ ERROR */
4518 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4519 /* FAILED RETRANSMISSION REQUEST */
4520 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4521 break;
4522 case TCM_WRITE_PROTECTED:
4523 /* CURRENT ERROR */
4524 buffer[offset] = 0x70;
4525 /* DATA PROTECT */
4526 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4527 /* WRITE PROTECTED */
4528 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4529 break;
4530 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4531 /* CURRENT ERROR */
4532 buffer[offset] = 0x70;
4533 /* UNIT ATTENTION */
4534 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4535 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4536 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4537 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4538 break;
4539 case TCM_CHECK_CONDITION_NOT_READY:
4540 /* CURRENT ERROR */
4541 buffer[offset] = 0x70;
4542 /* Not Ready */
4543 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4544 transport_get_sense_codes(cmd, &asc, &ascq);
4545 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4546 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4547 break;
4548 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4549 default:
4550 /* CURRENT ERROR */
4551 buffer[offset] = 0x70;
4552 /* ILLEGAL REQUEST */
4553 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4554 /* LOGICAL UNIT COMMUNICATION FAILURE */
4555 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4556 break;
4557 }
4558 /*
4559 * This code uses linux/include/scsi/scsi.h SAM status codes!
4560 */
4561 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4562 /*
4563 * Automatically padded, this value is encoded in the fabric's
4564 * data_length response PDU containing the SCSI defined sense data.
4565 */
4566 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4567
4568after_reason:
07bde79a 4569 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4570}
4571EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4572
4573int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4574{
4575 int ret = 0;
4576
a1d8b49a 4577 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4578 if (!send_status ||
c66ac9db
NB		 4579 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4580 return 1;
4581#if 0
6708bb27 4582 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4583 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4584 cmd->t_task_cdb[0],
e3d6f909 4585 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4586#endif
4587 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4588 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4589 ret = 1;
4590 }
4591 return ret;
4592}
4593EXPORT_SYMBOL(transport_check_aborted_status);
4594
4595void transport_send_task_abort(struct se_cmd *cmd)
4596{
c252f003
NB		 4597 unsigned long flags;
4598
4599 spin_lock_irqsave(&cmd->t_state_lock, flags);
4600 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4601 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4602 return;
4603 }
4604 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4605
c66ac9db
NB		 4606 /*
4607 * If there are still expected incoming fabric WRITEs, we wait
4608 * until until they have completed before sending a TASK_ABORTED
4609 * response. This response with TASK_ABORTED status will be
4610 * queued back to fabric module by transport_check_aborted_status().
4611 */
4612 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4613 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4614 atomic_inc(&cmd->t_transport_aborted);
c66ac9db 4615 smp_mb__after_atomic_inc();
c66ac9db
NB		 4616 }
4617 }
4618 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4619#if 0
6708bb27 4620 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4621 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4622 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4623#endif
e3d6f909 4624 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4625}
4626
e26d99ae 4627static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4628{
5951146d 4629 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4630 struct se_tmr_req *tmr = cmd->se_tmr_req;
4631 int ret;
4632
4633 switch (tmr->function) {
5c6cd613 4634 case TMR_ABORT_TASK:
c66ac9db
NB		 4635 tmr->response = TMR_FUNCTION_REJECTED;
4636 break;
5c6cd613
NB		 4637 case TMR_ABORT_TASK_SET:
4638 case TMR_CLEAR_ACA:
4639 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4640 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4641 break;
5c6cd613 4642 case TMR_LUN_RESET:
c66ac9db
NB		 4643 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4644 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4645 TMR_FUNCTION_REJECTED;
4646 break;
5c6cd613 4647 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4648 tmr->response = TMR_FUNCTION_REJECTED;
4649 break;
5c6cd613 4650 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4651 tmr->response = TMR_FUNCTION_REJECTED;
4652 break;
c66ac9db 4653 default:
6708bb27 4654 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4655 tmr->function);
4656 tmr->response = TMR_FUNCTION_REJECTED;
4657 break;
4658 }
4659
4660 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4661 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4662
b7b8bef7 4663 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4664 return 0;
4665}
4666
c66ac9db
NB		 4667/* transport_processing_thread():
4668 *
4669 *
4670 */
4671static int transport_processing_thread(void *param)
4672{
5951146d 4673 int ret;
c66ac9db 4674 struct se_cmd *cmd;
8359cf43 4675 struct se_device *dev = param;
c66ac9db 4676
c66ac9db 4677 while (!kthread_should_stop()) {
e3d6f909
AG		 4678 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4679 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4680 kthread_should_stop());
4681 if (ret < 0)
4682 goto out;
4683
c66ac9db
NB		 4684get_cmd:
4685 __transport_execute_tasks(dev);
4686
5951146d
AG		 4687 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4688 if (!cmd)
c66ac9db
NB		 4689 continue;
4690
5951146d 4691 switch (cmd->t_state) {
680b73c5
CH		 4692 case TRANSPORT_NEW_CMD:
4693 BUG();
4694 break;
c66ac9db 4695 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4696 if (!cmd->se_tfo->new_cmd_map) {
4697 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4698 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4699 BUG();
4700 }
e3d6f909 4701 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4702 if (ret < 0) {
03e98c9e 4703 transport_generic_request_failure(cmd);
c66ac9db
NB		 4704 break;
4705 }
c66ac9db 4706 ret = transport_generic_new_cmd(cmd);
f147abb4 4707 if (ret < 0) {
03e98c9e
NB		 4708 transport_generic_request_failure(cmd);
4709 break;
c66ac9db
NB		 4710 }
4711 break;
4712 case TRANSPORT_PROCESS_WRITE:
4713 transport_generic_process_write(cmd);
4714 break;
c66ac9db
NB		 4715 case TRANSPORT_PROCESS_TMR:
4716 transport_generic_do_tmr(cmd);
4717 break;
07bde79a 4718 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4719 transport_write_pending_qf(cmd);
4720 break;
4721 case TRANSPORT_COMPLETE_QF_OK:
4722 transport_complete_qf(cmd);
07bde79a 4723 break;
c66ac9db 4724 default:
f2da9dbd
CH		 4725 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4726 "i_state: %d on SE LUN: %u\n",
4727 cmd->t_state,
e3d6f909
AG		 4728 cmd->se_tfo->get_task_tag(cmd),
4729 cmd->se_tfo->get_cmd_state(cmd),
4730 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4731 BUG();
4732 }
4733
4734 goto get_cmd;
4735 }
4736
4737out:
ce8762f6
NB		 4738 WARN_ON(!list_empty(&dev->state_task_list));
4739 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4740 dev->process_thread = NULL;
4741 return 0;
4742}
Linux kernel - Deliverables
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