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target: remove unused TRANSPORT_ states
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
39#include <asm/unaligned.h>
40#include <net/sock.h>
41#include <net/tcp.h>
42#include <scsi/scsi.h>
43#include <scsi/scsi_cmnd.h>
e66ecd50 44#include <scsi/scsi_tcq.h>
c66ac9db
NB		 45
46#include <target/target_core_base.h>
47#include <target/target_core_device.h>
48#include <target/target_core_tmr.h>
49#include <target/target_core_tpg.h>
50#include <target/target_core_transport.h>
51#include <target/target_core_fabric_ops.h>
52#include <target/target_core_configfs.h>
53
54#include "target_core_alua.h"
55#include "target_core_hba.h"
56#include "target_core_pr.h"
c66ac9db
NB		 57#include "target_core_ua.h"
58
e3d6f909 59static int sub_api_initialized;
c66ac9db
NB		 60
61static struct kmem_cache *se_cmd_cache;
62static struct kmem_cache *se_sess_cache;
63struct kmem_cache *se_tmr_req_cache;
64struct kmem_cache *se_ua_cache;
c66ac9db
NB		 65struct kmem_cache *t10_pr_reg_cache;
66struct kmem_cache *t10_alua_lu_gp_cache;
67struct kmem_cache *t10_alua_lu_gp_mem_cache;
68struct kmem_cache *t10_alua_tg_pt_gp_cache;
69struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
70
c66ac9db 71static int transport_generic_write_pending(struct se_cmd *);
5951146d 72static int transport_processing_thread(void *param);
c66ac9db
NB		 73static int __transport_execute_tasks(struct se_device *dev);
74static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 75static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 76 struct se_device *dev);
c66ac9db
NB		 77static void transport_direct_request_timeout(struct se_cmd *cmd);
78static void transport_free_dev_tasks(struct se_cmd *cmd);
a1d8b49a 79static u32 transport_allocate_tasks(struct se_cmd *cmd,
ec98f782 80 unsigned long long starting_lba,
c66ac9db 81 enum dma_data_direction data_direction,
ec98f782 82 struct scatterlist *sgl, unsigned int nents);
05d1c7c0 83static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 84static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 85static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 86static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
c66ac9db 87
e3d6f909 88int init_se_kmem_caches(void)
c66ac9db 89{
c66ac9db
NB		 90 se_cmd_cache = kmem_cache_create("se_cmd_cache",
91 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
6708bb27
AG		 92 if (!se_cmd_cache) {
93 pr_err("kmem_cache_create for struct se_cmd failed\n");
c66ac9db
NB		 94 goto out;
95 }
96 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
97 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
98 0, NULL);
6708bb27
AG		 99 if (!se_tmr_req_cache) {
100 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db
NB		 101 " failed\n");
102 goto out;
103 }
104 se_sess_cache = kmem_cache_create("se_sess_cache",
105 sizeof(struct se_session), __alignof__(struct se_session),
106 0, NULL);
6708bb27
AG		 107 if (!se_sess_cache) {
108 pr_err("kmem_cache_create() for struct se_session"
c66ac9db
NB		 109 " failed\n");
110 goto out;
111 }
112 se_ua_cache = kmem_cache_create("se_ua_cache",
113 sizeof(struct se_ua), __alignof__(struct se_ua),
114 0, NULL);
6708bb27
AG		 115 if (!se_ua_cache) {
116 pr_err("kmem_cache_create() for struct se_ua failed\n");
c66ac9db
NB		 117 goto out;
118 }
c66ac9db
NB		 119 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
120 sizeof(struct t10_pr_registration),
121 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 122 if (!t10_pr_reg_cache) {
123 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db
NB		 124 " failed\n");
125 goto out;
126 }
127 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
128 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
129 0, NULL);
6708bb27
AG		 130 if (!t10_alua_lu_gp_cache) {
131 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db
NB		 132 " failed\n");
133 goto out;
134 }
135 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
136 sizeof(struct t10_alua_lu_gp_member),
137 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 138 if (!t10_alua_lu_gp_mem_cache) {
139 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db
NB		 140 "cache failed\n");
141 goto out;
142 }
143 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
144 sizeof(struct t10_alua_tg_pt_gp),
145 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 146 if (!t10_alua_tg_pt_gp_cache) {
147 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 148 "cache failed\n");
149 goto out;
150 }
151 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
152 "t10_alua_tg_pt_gp_mem_cache",
153 sizeof(struct t10_alua_tg_pt_gp_member),
154 __alignof__(struct t10_alua_tg_pt_gp_member),
155 0, NULL);
6708bb27
AG		 156 if (!t10_alua_tg_pt_gp_mem_cache) {
157 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 158 "mem_t failed\n");
159 goto out;
160 }
161
c66ac9db
NB		 162 return 0;
163out:
164 if (se_cmd_cache)
165 kmem_cache_destroy(se_cmd_cache);
166 if (se_tmr_req_cache)
167 kmem_cache_destroy(se_tmr_req_cache);
168 if (se_sess_cache)
169 kmem_cache_destroy(se_sess_cache);
170 if (se_ua_cache)
171 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 172 if (t10_pr_reg_cache)
173 kmem_cache_destroy(t10_pr_reg_cache);
174 if (t10_alua_lu_gp_cache)
175 kmem_cache_destroy(t10_alua_lu_gp_cache);
176 if (t10_alua_lu_gp_mem_cache)
177 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
178 if (t10_alua_tg_pt_gp_cache)
179 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
180 if (t10_alua_tg_pt_gp_mem_cache)
181 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
e3d6f909 182 return -ENOMEM;
c66ac9db
NB		 183}
184
e3d6f909 185void release_se_kmem_caches(void)
c66ac9db 186{
c66ac9db
NB		 187 kmem_cache_destroy(se_cmd_cache);
188 kmem_cache_destroy(se_tmr_req_cache);
189 kmem_cache_destroy(se_sess_cache);
190 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 191 kmem_cache_destroy(t10_pr_reg_cache);
192 kmem_cache_destroy(t10_alua_lu_gp_cache);
193 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
194 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
195 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 196}
197
e3d6f909
AG		 198/* This code ensures unique mib indexes are handed out. */
199static DEFINE_SPINLOCK(scsi_mib_index_lock);
200static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 201
202/*
203 * Allocate a new row index for the entry type specified
204 */
205u32 scsi_get_new_index(scsi_index_t type)
206{
207 u32 new_index;
208
e3d6f909 209 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 210
e3d6f909
AG		 211 spin_lock(&scsi_mib_index_lock);
212 new_index = ++scsi_mib_index[type];
213 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 214
215 return new_index;
216}
217
c66ac9db
NB		 218void transport_init_queue_obj(struct se_queue_obj *qobj)
219{
220 atomic_set(&qobj->queue_cnt, 0);
221 INIT_LIST_HEAD(&qobj->qobj_list);
222 init_waitqueue_head(&qobj->thread_wq);
223 spin_lock_init(&qobj->cmd_queue_lock);
224}
225EXPORT_SYMBOL(transport_init_queue_obj);
226
227static int transport_subsystem_reqmods(void)
228{
229 int ret;
230
231 ret = request_module("target_core_iblock");
232 if (ret != 0)
6708bb27 233 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 234
235 ret = request_module("target_core_file");
236 if (ret != 0)
6708bb27 237 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 238
239 ret = request_module("target_core_pscsi");
240 if (ret != 0)
6708bb27 241 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 242
243 ret = request_module("target_core_stgt");
244 if (ret != 0)
6708bb27 245 pr_err("Unable to load target_core_stgt\n");
c66ac9db
NB		 246
247 return 0;
248}
249
250int transport_subsystem_check_init(void)
251{
e3d6f909
AG		 252 int ret;
253
254 if (sub_api_initialized)
c66ac9db
NB		 255 return 0;
256 /*
257 * Request the loading of known TCM subsystem plugins..
258 */
e3d6f909
AG		 259 ret = transport_subsystem_reqmods();
260 if (ret < 0)
261 return ret;
c66ac9db 262
e3d6f909 263 sub_api_initialized = 1;
c66ac9db
NB		 264 return 0;
265}
266
267struct se_session *transport_init_session(void)
268{
269 struct se_session *se_sess;
270
271 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 272 if (!se_sess) {
273 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 274 " se_sess_cache\n");
275 return ERR_PTR(-ENOMEM);
276 }
277 INIT_LIST_HEAD(&se_sess->sess_list);
278 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 279
280 return se_sess;
281}
282EXPORT_SYMBOL(transport_init_session);
283
284/*
285 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
286 */
287void __transport_register_session(
288 struct se_portal_group *se_tpg,
289 struct se_node_acl *se_nacl,
290 struct se_session *se_sess,
291 void *fabric_sess_ptr)
292{
293 unsigned char buf[PR_REG_ISID_LEN];
294
295 se_sess->se_tpg = se_tpg;
296 se_sess->fabric_sess_ptr = fabric_sess_ptr;
297 /*
298 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
299 *
300 * Only set for struct se_session's that will actually be moving I/O.
301 * eg: *NOT* discovery sessions.
302 */
303 if (se_nacl) {
304 /*
305 * If the fabric module supports an ISID based TransportID,
306 * save this value in binary from the fabric I_T Nexus now.
307 */
e3d6f909 308 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 309 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 310 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 311 &buf[0], PR_REG_ISID_LEN);
312 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
313 }
314 spin_lock_irq(&se_nacl->nacl_sess_lock);
315 /*
316 * The se_nacl->nacl_sess pointer will be set to the
317 * last active I_T Nexus for each struct se_node_acl.
318 */
319 se_nacl->nacl_sess = se_sess;
320
321 list_add_tail(&se_sess->sess_acl_list,
322 &se_nacl->acl_sess_list);
323 spin_unlock_irq(&se_nacl->nacl_sess_lock);
324 }
325 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
326
6708bb27 327 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 328 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 329}
330EXPORT_SYMBOL(__transport_register_session);
331
332void transport_register_session(
333 struct se_portal_group *se_tpg,
334 struct se_node_acl *se_nacl,
335 struct se_session *se_sess,
336 void *fabric_sess_ptr)
337{
338 spin_lock_bh(&se_tpg->session_lock);
339 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
340 spin_unlock_bh(&se_tpg->session_lock);
341}
342EXPORT_SYMBOL(transport_register_session);
343
344void transport_deregister_session_configfs(struct se_session *se_sess)
345{
346 struct se_node_acl *se_nacl;
23388864 347 unsigned long flags;
c66ac9db
NB		 348 /*
349 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
350 */
351 se_nacl = se_sess->se_node_acl;
6708bb27 352 if (se_nacl) {
23388864 353 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 354 list_del(&se_sess->sess_acl_list);
355 /*
356 * If the session list is empty, then clear the pointer.
357 * Otherwise, set the struct se_session pointer from the tail
358 * element of the per struct se_node_acl active session list.
359 */
360 if (list_empty(&se_nacl->acl_sess_list))
361 se_nacl->nacl_sess = NULL;
362 else {
363 se_nacl->nacl_sess = container_of(
364 se_nacl->acl_sess_list.prev,
365 struct se_session, sess_acl_list);
366 }
23388864 367 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 368 }
369}
370EXPORT_SYMBOL(transport_deregister_session_configfs);
371
372void transport_free_session(struct se_session *se_sess)
373{
374 kmem_cache_free(se_sess_cache, se_sess);
375}
376EXPORT_SYMBOL(transport_free_session);
377
378void transport_deregister_session(struct se_session *se_sess)
379{
380 struct se_portal_group *se_tpg = se_sess->se_tpg;
381 struct se_node_acl *se_nacl;
e63a8e19 382 unsigned long flags;
c66ac9db 383
6708bb27 384 if (!se_tpg) {
c66ac9db
NB		 385 transport_free_session(se_sess);
386 return;
387 }
c66ac9db 388
e63a8e19 389 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 390 list_del(&se_sess->sess_list);
391 se_sess->se_tpg = NULL;
392 se_sess->fabric_sess_ptr = NULL;
e63a8e19 393 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 394
395 /*
396 * Determine if we need to do extra work for this initiator node's
397 * struct se_node_acl if it had been previously dynamically generated.
398 */
399 se_nacl = se_sess->se_node_acl;
6708bb27 400 if (se_nacl) {
e63a8e19 401 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 402 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 403 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
404 se_tpg)) {
c66ac9db
NB		 405 list_del(&se_nacl->acl_list);
406 se_tpg->num_node_acls--;
e63a8e19 407 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 408
409 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 410 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 411 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 412 se_nacl);
e63a8e19 413 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 414 }
415 }
e63a8e19 416 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 417 }
418
419 transport_free_session(se_sess);
420
6708bb27 421 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 422 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 423}
424EXPORT_SYMBOL(transport_deregister_session);
425
426/*
a1d8b49a 427 * Called with cmd->t_state_lock held.
c66ac9db
NB		 428 */
429static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
430{
42bf829e 431 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 432 struct se_task *task;
433 unsigned long flags;
434
42bf829e
CH		 435 if (!dev)
436 return;
c66ac9db 437
42bf829e 438 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 439 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 440 continue;
441
6708bb27 442 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 443 continue;
444
445 spin_lock_irqsave(&dev->execute_task_lock, flags);
446 list_del(&task->t_state_list);
6708bb27
AG		 447 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
448 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 449 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
450
451 atomic_set(&task->task_state_active, 0);
a1d8b49a 452 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 453 }
454}
455
456/* transport_cmd_check_stop():
457 *
458 * 'transport_off = 1' determines if t_transport_active should be cleared.
459 * 'transport_off = 2' determines if task_dev_state should be removed.
460 *
461 * A non-zero u8 t_state sets cmd->t_state.
462 * Returns 1 when command is stopped, else 0.
463 */
464static int transport_cmd_check_stop(
465 struct se_cmd *cmd,
466 int transport_off,
467 u8 t_state)
468{
469 unsigned long flags;
470
a1d8b49a 471 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 472 /*
473 * Determine if IOCTL context caller in requesting the stopping of this
474 * command for LUN shutdown purposes.
475 */
a1d8b49a 476 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 477 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 478 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 479 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 480
a1d8b49a 481 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 482 if (transport_off == 2)
483 transport_all_task_dev_remove_state(cmd);
a1d8b49a 484 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 485
a1d8b49a 486 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 487 return 1;
488 }
489 /*
490 * Determine if frontend context caller is requesting the stopping of
e3d6f909 491 * this command for frontend exceptions.
c66ac9db 492 */
a1d8b49a 493 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 494 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 495 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 496 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 497
c66ac9db
NB		 498 if (transport_off == 2)
499 transport_all_task_dev_remove_state(cmd);
500
501 /*
502 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
503 * to FE.
504 */
505 if (transport_off == 2)
506 cmd->se_lun = NULL;
a1d8b49a 507 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 508
a1d8b49a 509 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 510 return 1;
511 }
512 if (transport_off) {
a1d8b49a 513 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 514 if (transport_off == 2) {
515 transport_all_task_dev_remove_state(cmd);
516 /*
517 * Clear struct se_cmd->se_lun before the transport_off == 2
518 * handoff to fabric module.
519 */
520 cmd->se_lun = NULL;
521 /*
522 * Some fabric modules like tcm_loop can release
25985edc 523 * their internally allocated I/O reference now and
c66ac9db
NB		 524 * struct se_cmd now.
525 */
e3d6f909 526 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 527 spin_unlock_irqrestore(
a1d8b49a 528 &cmd->t_state_lock, flags);
c66ac9db 529
e3d6f909 530 cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 531 return 1;
532 }
533 }
a1d8b49a 534 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 535
536 return 0;
537 } else if (t_state)
538 cmd->t_state = t_state;
a1d8b49a 539 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 540
541 return 0;
542}
543
544static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
545{
546 return transport_cmd_check_stop(cmd, 2, 0);
547}
548
549static void transport_lun_remove_cmd(struct se_cmd *cmd)
550{
e3d6f909 551 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 552 unsigned long flags;
553
554 if (!lun)
555 return;
556
a1d8b49a 557 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 558 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 559 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 560 goto check_lun;
561 }
a1d8b49a 562 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 563 transport_all_task_dev_remove_state(cmd);
a1d8b49a 564 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 565
c66ac9db
NB		 566
567check_lun:
568 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 569 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 570 list_del(&cmd->se_lun_node);
a1d8b49a 571 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 572#if 0
6708bb27 573 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 574 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 575#endif
576 }
577 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
578}
579
580void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
581{
8dc52b54
NB		 582 if (!cmd->se_tmr_req)
583 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 584
585 if (transport_cmd_check_stop_to_fabric(cmd))
586 return;
77039d1e 587 if (remove) {
3df8d40b 588 transport_remove_cmd_from_queue(cmd);
e6a2573f 589 transport_put_cmd(cmd);
77039d1e 590 }
c66ac9db
NB		 591}
592
f7a5cc0b
CH		 593static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
594 bool at_head)
c66ac9db
NB		 595{
596 struct se_device *dev = cmd->se_dev;
e3d6f909 597 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 598 unsigned long flags;
599
c66ac9db 600 if (t_state) {
a1d8b49a 601 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 602 cmd->t_state = t_state;
a1d8b49a
AG		 603 atomic_set(&cmd->t_transport_active, 1);
604 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 605 }
606
607 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 608
609 /* If the cmd is already on the list, remove it before we add it */
610 if (!list_empty(&cmd->se_queue_node))
611 list_del(&cmd->se_queue_node);
612 else
613 atomic_inc(&qobj->queue_cnt);
614
f7a5cc0b 615 if (at_head)
07bde79a 616 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 617 else
07bde79a 618 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 619 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 620 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
621
c66ac9db 622 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 623}
624
5951146d
AG		 625static struct se_cmd *
626transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 627{
5951146d 628 struct se_cmd *cmd;
c66ac9db
NB		 629 unsigned long flags;
630
631 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
632 if (list_empty(&qobj->qobj_list)) {
633 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
634 return NULL;
635 }
5951146d 636 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 637
79a7fef2 638 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 639
79a7fef2 640 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 641 atomic_dec(&qobj->queue_cnt);
642 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
643
5951146d 644 return cmd;
c66ac9db
NB		 645}
646
3df8d40b 647static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 648{
3df8d40b 649 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 650 unsigned long flags;
651
652 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 653 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 654 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
655 return;
656 }
79a7fef2
RD		 657 atomic_set(&cmd->t_transport_queue_active, 0);
658 atomic_dec(&qobj->queue_cnt);
659 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 660 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
661
a1d8b49a 662 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 663 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 664 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 665 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 666 }
667}
668
669/*
670 * Completion function used by TCM subsystem plugins (such as FILEIO)
671 * for queueing up response from struct se_subsystem_api->do_task()
672 */
673void transport_complete_sync_cache(struct se_cmd *cmd, int good)
674{
a1d8b49a 675 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 676 struct se_task, t_list);
677
678 if (good) {
679 cmd->scsi_status = SAM_STAT_GOOD;
680 task->task_scsi_status = GOOD;
681 } else {
682 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
683 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 684 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 685 PYX_TRANSPORT_ILLEGAL_REQUEST;
686 }
687
688 transport_complete_task(task, good);
689}
690EXPORT_SYMBOL(transport_complete_sync_cache);
691
692/* transport_complete_task():
693 *
694 * Called from interrupt and non interrupt context depending
695 * on the transport plugin.
696 */
697void transport_complete_task(struct se_task *task, int success)
698{
e3d6f909 699 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 700 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 701 int t_state;
702 unsigned long flags;
703#if 0
6708bb27 704 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 705 cmd->t_task_cdb[0], dev);
c66ac9db 706#endif
e3d6f909 707 if (dev)
c66ac9db 708 atomic_inc(&dev->depth_left);
c66ac9db 709
cc5d0f0f
CH		 710 del_timer(&task->task_timer);
711
a1d8b49a 712 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 713 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 714
715 /*
716 * See if any sense data exists, if so set the TASK_SENSE flag.
717 * Also check for any other post completion work that needs to be
718 * done by the plugins.
719 */
720 if (dev && dev->transport->transport_complete) {
721 if (dev->transport->transport_complete(task) != 0) {
722 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
723 task->task_sense = 1;
724 success = 1;
725 }
726 }
727
728 /*
729 * See if we are waiting for outstanding struct se_task
730 * to complete for an exception condition
731 */
6c76bf95 732 if (task->task_flags & TF_REQUEST_STOP) {
c66ac9db 733 /*
a1d8b49a 734 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 735 * previously thrown its timeout exception handler.
736 */
6c76bf95 737 if (task->task_flags & TF_TIMEOUT) {
a1d8b49a 738 atomic_dec(&cmd->t_se_count);
6c76bf95 739 task->task_flags &= ~TF_TIMEOUT;
c66ac9db 740 }
a1d8b49a 741 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 742
743 complete(&task->task_stop_comp);
744 return;
745 }
746 /*
747 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
748 * left counter to determine when the struct se_cmd is ready to be queued to
749 * the processing thread.
750 */
6c76bf95 751 if (task->task_flags & TF_TIMEOUT) {
6708bb27
AG		 752 if (!atomic_dec_and_test(
753 &cmd->t_task_cdbs_timeout_left)) {
a1d8b49a 754 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 755 flags);
756 return;
757 }
758 t_state = TRANSPORT_COMPLETE_TIMEOUT;
a1d8b49a 759 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 760
f7a5cc0b 761 transport_add_cmd_to_queue(cmd, t_state, false);
c66ac9db
NB		 762 return;
763 }
a1d8b49a 764 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 765
766 /*
767 * Decrement the outstanding t_task_cdbs_left count. The last
768 * struct se_task from struct se_cmd will complete itself into the
769 * device queue depending upon int success.
770 */
6708bb27 771 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
c66ac9db 772 if (!success)
a1d8b49a 773 cmd->t_tasks_failed = 1;
c66ac9db 774
a1d8b49a 775 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 776 return;
777 }
778
a1d8b49a 779 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 780 t_state = TRANSPORT_COMPLETE_FAILURE;
781 if (!task->task_error_status) {
782 task->task_error_status =
783 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
784 cmd->transport_error_status =
785 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
786 }
787 } else {
a1d8b49a 788 atomic_set(&cmd->t_transport_complete, 1);
c66ac9db
NB		 789 t_state = TRANSPORT_COMPLETE_OK;
790 }
a1d8b49a 791 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 792
f7a5cc0b 793 transport_add_cmd_to_queue(cmd, t_state, false);
c66ac9db
NB		 794}
795EXPORT_SYMBOL(transport_complete_task);
796
797/*
798 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
799 * struct se_task list are ready to be added to the active execution list
800 * struct se_device
801
802 * Called with se_dev_t->execute_task_lock called.
803 */
804static inline int transport_add_task_check_sam_attr(
805 struct se_task *task,
806 struct se_task *task_prev,
807 struct se_device *dev)
808{
809 /*
810 * No SAM Task attribute emulation enabled, add to tail of
811 * execution queue
812 */
813 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
814 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
815 return 0;
816 }
817 /*
818 * HEAD_OF_QUEUE attribute for received CDB, which means
819 * the first task that is associated with a struct se_cmd goes to
820 * head of the struct se_device->execute_task_list, and task_prev
821 * after that for each subsequent task
822 */
e66ecd50 823 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 824 list_add(&task->t_execute_list,
825 (task_prev != NULL) ?
826 &task_prev->t_execute_list :
827 &dev->execute_task_list);
828
6708bb27 829 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 830 " in execution queue\n",
6708bb27 831 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 832 return 1;
833 }
834 /*
835 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
836 * transitioned from Dermant -> Active state, and are added to the end
837 * of the struct se_device->execute_task_list
838 */
839 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
840 return 0;
841}
842
843/* __transport_add_task_to_execute_queue():
844 *
845 * Called with se_dev_t->execute_task_lock called.
846 */
847static void __transport_add_task_to_execute_queue(
848 struct se_task *task,
849 struct se_task *task_prev,
850 struct se_device *dev)
851{
852 int head_of_queue;
853
854 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
855 atomic_inc(&dev->execute_tasks);
856
857 if (atomic_read(&task->task_state_active))
858 return;
859 /*
860 * Determine if this task needs to go to HEAD_OF_QUEUE for the
861 * state list as well. Running with SAM Task Attribute emulation
862 * will always return head_of_queue == 0 here
863 */
864 if (head_of_queue)
865 list_add(&task->t_state_list, (task_prev) ?
866 &task_prev->t_state_list :
867 &dev->state_task_list);
868 else
869 list_add_tail(&task->t_state_list, &dev->state_task_list);
870
871 atomic_set(&task->task_state_active, 1);
872
6708bb27 873 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 874 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 875 task, dev);
876}
877
878static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
879{
42bf829e 880 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 881 struct se_task *task;
882 unsigned long flags;
883
a1d8b49a
AG		 884 spin_lock_irqsave(&cmd->t_state_lock, flags);
885 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 886 if (atomic_read(&task->task_state_active))
887 continue;
888
889 spin_lock(&dev->execute_task_lock);
890 list_add_tail(&task->t_state_list, &dev->state_task_list);
891 atomic_set(&task->task_state_active, 1);
892
6708bb27
AG		 893 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
894 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 895 task->task_se_cmd), task, dev);
896
897 spin_unlock(&dev->execute_task_lock);
898 }
a1d8b49a 899 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 900}
901
902static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
903{
5951146d 904 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 905 struct se_task *task, *task_prev = NULL;
906 unsigned long flags;
907
908 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 909 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 910 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 911 continue;
912 /*
913 * __transport_add_task_to_execute_queue() handles the
914 * SAM Task Attribute emulation if enabled
915 */
916 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 917 task_prev = task;
918 }
919 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 920}
921
04629b7b
CH		 922void __transport_remove_task_from_execute_queue(struct se_task *task,
923 struct se_device *dev)
924{
925 list_del_init(&task->t_execute_list);
926 atomic_dec(&dev->execute_tasks);
927}
928
52208ae3 929void transport_remove_task_from_execute_queue(
c66ac9db
NB		 930 struct se_task *task,
931 struct se_device *dev)
932{
933 unsigned long flags;
934
04629b7b 935 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 936 return;
af57c3ac 937
c66ac9db 938 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 939 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 940 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
941}
942
07bde79a
NB		 943/*
944 * Handle QUEUE_FULL / -EAGAIN status
945 */
946
947static void target_qf_do_work(struct work_struct *work)
948{
949 struct se_device *dev = container_of(work, struct se_device,
950 qf_work_queue);
bcac364a 951 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 952 struct se_cmd *cmd, *cmd_tmp;
953
954 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 955 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
956 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 957
bcac364a 958 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 959 list_del(&cmd->se_qf_node);
960 atomic_dec(&dev->dev_qf_count);
961 smp_mb__after_atomic_dec();
07bde79a 962
6708bb27 963 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 964 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 965 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 966 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
967 : "UNKNOWN");
f7a5cc0b
CH		 968
969 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 970 }
07bde79a
NB		 971}
972
c66ac9db
NB		 973unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
974{
975 switch (cmd->data_direction) {
976 case DMA_NONE:
977 return "NONE";
978 case DMA_FROM_DEVICE:
979 return "READ";
980 case DMA_TO_DEVICE:
981 return "WRITE";
982 case DMA_BIDIRECTIONAL:
983 return "BIDI";
984 default:
985 break;
986 }
987
988 return "UNKNOWN";
989}
990
991void transport_dump_dev_state(
992 struct se_device *dev,
993 char *b,
994 int *bl)
995{
996 *bl += sprintf(b + *bl, "Status: ");
997 switch (dev->dev_status) {
998 case TRANSPORT_DEVICE_ACTIVATED:
999 *bl += sprintf(b + *bl, "ACTIVATED");
1000 break;
1001 case TRANSPORT_DEVICE_DEACTIVATED:
1002 *bl += sprintf(b + *bl, "DEACTIVATED");
1003 break;
1004 case TRANSPORT_DEVICE_SHUTDOWN:
1005 *bl += sprintf(b + *bl, "SHUTDOWN");
1006 break;
1007 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1008 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1009 *bl += sprintf(b + *bl, "OFFLINE");
1010 break;
1011 default:
1012 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1013 break;
1014 }
1015
1016 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1017 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1018 dev->queue_depth);
1019 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1020 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1021 *bl += sprintf(b + *bl, " ");
1022}
1023
c66ac9db
NB		 1024void transport_dump_vpd_proto_id(
1025 struct t10_vpd *vpd,
1026 unsigned char *p_buf,
1027 int p_buf_len)
1028{
1029 unsigned char buf[VPD_TMP_BUF_SIZE];
1030 int len;
1031
1032 memset(buf, 0, VPD_TMP_BUF_SIZE);
1033 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1034
1035 switch (vpd->protocol_identifier) {
1036 case 0x00:
1037 sprintf(buf+len, "Fibre Channel\n");
1038 break;
1039 case 0x10:
1040 sprintf(buf+len, "Parallel SCSI\n");
1041 break;
1042 case 0x20:
1043 sprintf(buf+len, "SSA\n");
1044 break;
1045 case 0x30:
1046 sprintf(buf+len, "IEEE 1394\n");
1047 break;
1048 case 0x40:
1049 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1050 " Protocol\n");
1051 break;
1052 case 0x50:
1053 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1054 break;
1055 case 0x60:
1056 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1057 break;
1058 case 0x70:
1059 sprintf(buf+len, "Automation/Drive Interface Transport"
1060 " Protocol\n");
1061 break;
1062 case 0x80:
1063 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1064 break;
1065 default:
1066 sprintf(buf+len, "Unknown 0x%02x\n",
1067 vpd->protocol_identifier);
1068 break;
1069 }
1070
1071 if (p_buf)
1072 strncpy(p_buf, buf, p_buf_len);
1073 else
6708bb27 1074 pr_debug("%s", buf);
c66ac9db
NB		 1075}
1076
1077void
1078transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1079{
1080 /*
1081 * Check if the Protocol Identifier Valid (PIV) bit is set..
1082 *
1083 * from spc3r23.pdf section 7.5.1
1084 */
1085 if (page_83[1] & 0x80) {
1086 vpd->protocol_identifier = (page_83[0] & 0xf0);
1087 vpd->protocol_identifier_set = 1;
1088 transport_dump_vpd_proto_id(vpd, NULL, 0);
1089 }
1090}
1091EXPORT_SYMBOL(transport_set_vpd_proto_id);
1092
1093int transport_dump_vpd_assoc(
1094 struct t10_vpd *vpd,
1095 unsigned char *p_buf,
1096 int p_buf_len)
1097{
1098 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1099 int ret = 0;
1100 int len;
c66ac9db
NB		 1101
1102 memset(buf, 0, VPD_TMP_BUF_SIZE);
1103 len = sprintf(buf, "T10 VPD Identifier Association: ");
1104
1105 switch (vpd->association) {
1106 case 0x00:
1107 sprintf(buf+len, "addressed logical unit\n");
1108 break;
1109 case 0x10:
1110 sprintf(buf+len, "target port\n");
1111 break;
1112 case 0x20:
1113 sprintf(buf+len, "SCSI target device\n");
1114 break;
1115 default:
1116 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1117 ret = -EINVAL;
c66ac9db
NB		 1118 break;
1119 }
1120
1121 if (p_buf)
1122 strncpy(p_buf, buf, p_buf_len);
1123 else
6708bb27 1124 pr_debug("%s", buf);
c66ac9db
NB		 1125
1126 return ret;
1127}
1128
1129int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1130{
1131 /*
1132 * The VPD identification association..
1133 *
1134 * from spc3r23.pdf Section 7.6.3.1 Table 297
1135 */
1136 vpd->association = (page_83[1] & 0x30);
1137 return transport_dump_vpd_assoc(vpd, NULL, 0);
1138}
1139EXPORT_SYMBOL(transport_set_vpd_assoc);
1140
1141int transport_dump_vpd_ident_type(
1142 struct t10_vpd *vpd,
1143 unsigned char *p_buf,
1144 int p_buf_len)
1145{
1146 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1147 int ret = 0;
1148 int len;
c66ac9db
NB		 1149
1150 memset(buf, 0, VPD_TMP_BUF_SIZE);
1151 len = sprintf(buf, "T10 VPD Identifier Type: ");
1152
1153 switch (vpd->device_identifier_type) {
1154 case 0x00:
1155 sprintf(buf+len, "Vendor specific\n");
1156 break;
1157 case 0x01:
1158 sprintf(buf+len, "T10 Vendor ID based\n");
1159 break;
1160 case 0x02:
1161 sprintf(buf+len, "EUI-64 based\n");
1162 break;
1163 case 0x03:
1164 sprintf(buf+len, "NAA\n");
1165 break;
1166 case 0x04:
1167 sprintf(buf+len, "Relative target port identifier\n");
1168 break;
1169 case 0x08:
1170 sprintf(buf+len, "SCSI name string\n");
1171 break;
1172 default:
1173 sprintf(buf+len, "Unsupported: 0x%02x\n",
1174 vpd->device_identifier_type);
e3d6f909 1175 ret = -EINVAL;
c66ac9db
NB		 1176 break;
1177 }
1178
e3d6f909
AG		 1179 if (p_buf) {
1180 if (p_buf_len < strlen(buf)+1)
1181 return -EINVAL;
c66ac9db 1182 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1183 } else {
6708bb27 1184 pr_debug("%s", buf);
e3d6f909 1185 }
c66ac9db
NB		 1186
1187 return ret;
1188}
1189
1190int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1191{
1192 /*
1193 * The VPD identifier type..
1194 *
1195 * from spc3r23.pdf Section 7.6.3.1 Table 298
1196 */
1197 vpd->device_identifier_type = (page_83[1] & 0x0f);
1198 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1199}
1200EXPORT_SYMBOL(transport_set_vpd_ident_type);
1201
1202int transport_dump_vpd_ident(
1203 struct t10_vpd *vpd,
1204 unsigned char *p_buf,
1205 int p_buf_len)
1206{
1207 unsigned char buf[VPD_TMP_BUF_SIZE];
1208 int ret = 0;
1209
1210 memset(buf, 0, VPD_TMP_BUF_SIZE);
1211
1212 switch (vpd->device_identifier_code_set) {
1213 case 0x01: /* Binary */
1214 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1215 &vpd->device_identifier[0]);
1216 break;
1217 case 0x02: /* ASCII */
1218 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1219 &vpd->device_identifier[0]);
1220 break;
1221 case 0x03: /* UTF-8 */
1222 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1223 &vpd->device_identifier[0]);
1224 break;
1225 default:
1226 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1227 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1228 ret = -EINVAL;
c66ac9db
NB		 1229 break;
1230 }
1231
1232 if (p_buf)
1233 strncpy(p_buf, buf, p_buf_len);
1234 else
6708bb27 1235 pr_debug("%s", buf);
c66ac9db
NB		 1236
1237 return ret;
1238}
1239
1240int
1241transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1242{
1243 static const char hex_str[] = "0123456789abcdef";
1244 int j = 0, i = 4; /* offset to start of the identifer */
1245
1246 /*
1247 * The VPD Code Set (encoding)
1248 *
1249 * from spc3r23.pdf Section 7.6.3.1 Table 296
1250 */
1251 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1252 switch (vpd->device_identifier_code_set) {
1253 case 0x01: /* Binary */
1254 vpd->device_identifier[j++] =
1255 hex_str[vpd->device_identifier_type];
1256 while (i < (4 + page_83[3])) {
1257 vpd->device_identifier[j++] =
1258 hex_str[(page_83[i] & 0xf0) >> 4];
1259 vpd->device_identifier[j++] =
1260 hex_str[page_83[i] & 0x0f];
1261 i++;
1262 }
1263 break;
1264 case 0x02: /* ASCII */
1265 case 0x03: /* UTF-8 */
1266 while (i < (4 + page_83[3]))
1267 vpd->device_identifier[j++] = page_83[i++];
1268 break;
1269 default:
1270 break;
1271 }
1272
1273 return transport_dump_vpd_ident(vpd, NULL, 0);
1274}
1275EXPORT_SYMBOL(transport_set_vpd_ident);
1276
1277static void core_setup_task_attr_emulation(struct se_device *dev)
1278{
1279 /*
1280 * If this device is from Target_Core_Mod/pSCSI, disable the
1281 * SAM Task Attribute emulation.
1282 *
1283 * This is currently not available in upsream Linux/SCSI Target
1284 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1285 */
e3d6f909 1286 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1287 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1288 return;
1289 }
1290
1291 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1292 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1293 " device\n", dev->transport->name,
1294 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1295}
1296
1297static void scsi_dump_inquiry(struct se_device *dev)
1298{
e3d6f909 1299 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1300 int i, device_type;
1301 /*
1302 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1303 */
6708bb27 1304 pr_debug(" Vendor: ");
c66ac9db
NB		 1305 for (i = 0; i < 8; i++)
1306 if (wwn->vendor[i] >= 0x20)
6708bb27 1307 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1308 else
6708bb27 1309 pr_debug(" ");
c66ac9db 1310
6708bb27 1311 pr_debug(" Model: ");
c66ac9db
NB		 1312 for (i = 0; i < 16; i++)
1313 if (wwn->model[i] >= 0x20)
6708bb27 1314 pr_debug("%c", wwn->model[i]);
c66ac9db 1315 else
6708bb27 1316 pr_debug(" ");
c66ac9db 1317
6708bb27 1318 pr_debug(" Revision: ");
c66ac9db
NB		 1319 for (i = 0; i < 4; i++)
1320 if (wwn->revision[i] >= 0x20)
6708bb27 1321 pr_debug("%c", wwn->revision[i]);
c66ac9db 1322 else
6708bb27 1323 pr_debug(" ");
c66ac9db 1324
6708bb27 1325 pr_debug("\n");
c66ac9db 1326
e3d6f909 1327 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1328 pr_debug(" Type: %s ", scsi_device_type(device_type));
1329 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1330 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1331}
1332
1333struct se_device *transport_add_device_to_core_hba(
1334 struct se_hba *hba,
1335 struct se_subsystem_api *transport,
1336 struct se_subsystem_dev *se_dev,
1337 u32 device_flags,
1338 void *transport_dev,
1339 struct se_dev_limits *dev_limits,
1340 const char *inquiry_prod,
1341 const char *inquiry_rev)
1342{
12a18bdc 1343 int force_pt;
c66ac9db
NB		 1344 struct se_device *dev;
1345
1346 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1347 if (!dev) {
1348 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1349 return NULL;
1350 }
c66ac9db 1351
e3d6f909 1352 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1353 dev->dev_flags = device_flags;
1354 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1355 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1356 dev->se_hba = hba;
1357 dev->se_sub_dev = se_dev;
1358 dev->transport = transport;
1359 atomic_set(&dev->active_cmds, 0);
1360 INIT_LIST_HEAD(&dev->dev_list);
1361 INIT_LIST_HEAD(&dev->dev_sep_list);
1362 INIT_LIST_HEAD(&dev->dev_tmr_list);
1363 INIT_LIST_HEAD(&dev->execute_task_list);
1364 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1365 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1366 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1367 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1368 spin_lock_init(&dev->execute_task_lock);
1369 spin_lock_init(&dev->delayed_cmd_lock);
1370 spin_lock_init(&dev->ordered_cmd_lock);
1371 spin_lock_init(&dev->state_task_lock);
1372 spin_lock_init(&dev->dev_alua_lock);
1373 spin_lock_init(&dev->dev_reservation_lock);
1374 spin_lock_init(&dev->dev_status_lock);
1375 spin_lock_init(&dev->dev_status_thr_lock);
1376 spin_lock_init(&dev->se_port_lock);
1377 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1378 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1379
1380 dev->queue_depth = dev_limits->queue_depth;
1381 atomic_set(&dev->depth_left, dev->queue_depth);
1382 atomic_set(&dev->dev_ordered_id, 0);
1383
1384 se_dev_set_default_attribs(dev, dev_limits);
1385
1386 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1387 dev->creation_time = get_jiffies_64();
1388 spin_lock_init(&dev->stats_lock);
1389
1390 spin_lock(&hba->device_lock);
1391 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1392 hba->dev_count++;
1393 spin_unlock(&hba->device_lock);
1394 /*
1395 * Setup the SAM Task Attribute emulation for struct se_device
1396 */
1397 core_setup_task_attr_emulation(dev);
1398 /*
1399 * Force PR and ALUA passthrough emulation with internal object use.
1400 */
1401 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1402 /*
1403 * Setup the Reservations infrastructure for struct se_device
1404 */
1405 core_setup_reservations(dev, force_pt);
1406 /*
1407 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1408 */
1409 if (core_setup_alua(dev, force_pt) < 0)
1410 goto out;
1411
1412 /*
1413 * Startup the struct se_device processing thread
1414 */
1415 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1416 "LIO_%s", dev->transport->name);
c66ac9db 1417 if (IS_ERR(dev->process_thread)) {
6708bb27 1418 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1419 dev->transport->name);
c66ac9db
NB		 1420 goto out;
1421 }
07bde79a
NB		 1422 /*
1423 * Setup work_queue for QUEUE_FULL
1424 */
1425 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1426 /*
1427 * Preload the initial INQUIRY const values if we are doing
1428 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1429 * passthrough because this is being provided by the backend LLD.
1430 * This is required so that transport_get_inquiry() copies these
1431 * originals once back into DEV_T10_WWN(dev) for the virtual device
1432 * setup.
1433 */
e3d6f909 1434 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1435 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1436 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1437 " INQUIRY consts\n");
1438 goto out;
1439 }
1440
e3d6f909
AG		 1441 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1442 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1443 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1444 }
1445 scsi_dump_inquiry(dev);
1446
12a18bdc 1447 return dev;
c66ac9db 1448out:
c66ac9db
NB		 1449 kthread_stop(dev->process_thread);
1450
1451 spin_lock(&hba->device_lock);
1452 list_del(&dev->dev_list);
1453 hba->dev_count--;
1454 spin_unlock(&hba->device_lock);
1455
1456 se_release_vpd_for_dev(dev);
1457
c66ac9db
NB		 1458 kfree(dev);
1459
1460 return NULL;
1461}
1462EXPORT_SYMBOL(transport_add_device_to_core_hba);
1463
1464/* transport_generic_prepare_cdb():
1465 *
1466 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1467 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1468 * The point of this is since we are mapping iSCSI LUNs to
1469 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1470 * devices and HBAs for a loop.
1471 */
1472static inline void transport_generic_prepare_cdb(
1473 unsigned char *cdb)
1474{
1475 switch (cdb[0]) {
1476 case READ_10: /* SBC - RDProtect */
1477 case READ_12: /* SBC - RDProtect */
1478 case READ_16: /* SBC - RDProtect */
1479 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1480 case VERIFY: /* SBC - VRProtect */
1481 case VERIFY_16: /* SBC - VRProtect */
1482 case WRITE_VERIFY: /* SBC - VRProtect */
1483 case WRITE_VERIFY_12: /* SBC - VRProtect */
1484 break;
1485 default:
1486 cdb[1] &= 0x1f; /* clear logical unit number */
1487 break;
1488 }
1489}
1490
1491static struct se_task *
1492transport_generic_get_task(struct se_cmd *cmd,
1493 enum dma_data_direction data_direction)
1494{
1495 struct se_task *task;
5951146d 1496 struct se_device *dev = cmd->se_dev;
c66ac9db 1497
6708bb27 1498 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1499 if (!task) {
6708bb27 1500 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1501 return NULL;
1502 }
1503
1504 INIT_LIST_HEAD(&task->t_list);
1505 INIT_LIST_HEAD(&task->t_execute_list);
1506 INIT_LIST_HEAD(&task->t_state_list);
cc5d0f0f 1507 init_timer(&task->task_timer);
c66ac9db 1508 init_completion(&task->task_stop_comp);
c66ac9db 1509 task->task_se_cmd = cmd;
c66ac9db
NB		 1510 task->task_data_direction = data_direction;
1511
c66ac9db
NB		 1512 return task;
1513}
1514
1515static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1516
c66ac9db
NB		 1517/*
1518 * Used by fabric modules containing a local struct se_cmd within their
1519 * fabric dependent per I/O descriptor.
1520 */
1521void transport_init_se_cmd(
1522 struct se_cmd *cmd,
1523 struct target_core_fabric_ops *tfo,
1524 struct se_session *se_sess,
1525 u32 data_length,
1526 int data_direction,
1527 int task_attr,
1528 unsigned char *sense_buffer)
1529{
5951146d
AG		 1530 INIT_LIST_HEAD(&cmd->se_lun_node);
1531 INIT_LIST_HEAD(&cmd->se_delayed_node);
1532 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1533 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1534 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db 1535
a1d8b49a
AG		 1536 INIT_LIST_HEAD(&cmd->t_task_list);
1537 init_completion(&cmd->transport_lun_fe_stop_comp);
1538 init_completion(&cmd->transport_lun_stop_comp);
1539 init_completion(&cmd->t_transport_stop_comp);
1540 spin_lock_init(&cmd->t_state_lock);
1541 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1542
1543 cmd->se_tfo = tfo;
1544 cmd->se_sess = se_sess;
1545 cmd->data_length = data_length;
1546 cmd->data_direction = data_direction;
1547 cmd->sam_task_attr = task_attr;
1548 cmd->sense_buffer = sense_buffer;
1549}
1550EXPORT_SYMBOL(transport_init_se_cmd);
1551
1552static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1553{
1554 /*
1555 * Check if SAM Task Attribute emulation is enabled for this
1556 * struct se_device storage object
1557 */
5951146d 1558 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1559 return 0;
1560
e66ecd50 1561 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1562 pr_debug("SAM Task Attribute ACA"
c66ac9db 1563 " emulation is not supported\n");
e3d6f909 1564 return -EINVAL;
c66ac9db
NB		 1565 }
1566 /*
1567 * Used to determine when ORDERED commands should go from
1568 * Dormant to Active status.
1569 */
5951146d 1570 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1571 smp_mb__after_atomic_inc();
6708bb27 1572 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1573 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1574 cmd->se_dev->transport->name);
c66ac9db
NB		 1575 return 0;
1576}
1577
c66ac9db
NB		 1578/* transport_generic_allocate_tasks():
1579 *
1580 * Called from fabric RX Thread.
1581 */
1582int transport_generic_allocate_tasks(
1583 struct se_cmd *cmd,
1584 unsigned char *cdb)
1585{
1586 int ret;
1587
1588 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1589 /*
1590 * Ensure that the received CDB is less than the max (252 + 8) bytes
1591 * for VARIABLE_LENGTH_CMD
1592 */
1593 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1594 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1595 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1596 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1597 return -EINVAL;
c66ac9db
NB		 1598 }
1599 /*
1600 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1601 * allocate the additional extended CDB buffer now.. Otherwise
1602 * setup the pointer from __t_task_cdb to t_task_cdb.
1603 */
a1d8b49a
AG		 1604 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1605 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1606 GFP_KERNEL);
6708bb27
AG		 1607 if (!cmd->t_task_cdb) {
1608 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1609 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1610 scsi_command_size(cdb),
a1d8b49a 1611 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1612 return -ENOMEM;
c66ac9db
NB		 1613 }
1614 } else
a1d8b49a 1615 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1616 /*
a1d8b49a 1617 * Copy the original CDB into cmd->
c66ac9db 1618 */
a1d8b49a 1619 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1620 /*
1621 * Setup the received CDB based on SCSI defined opcodes and
1622 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1623 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1624 * pointer is expected to be setup before we reach this point.
1625 */
1626 ret = transport_generic_cmd_sequencer(cmd, cdb);
1627 if (ret < 0)
1628 return ret;
1629 /*
1630 * Check for SAM Task Attribute Emulation
1631 */
1632 if (transport_check_alloc_task_attr(cmd) < 0) {
1633 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1634 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1635 return -EINVAL;
c66ac9db
NB		 1636 }
1637 spin_lock(&cmd->se_lun->lun_sep_lock);
1638 if (cmd->se_lun->lun_sep)
1639 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1640 spin_unlock(&cmd->se_lun->lun_sep_lock);
1641 return 0;
1642}
1643EXPORT_SYMBOL(transport_generic_allocate_tasks);
1644
4499dda8
CH		 1645static void transport_generic_request_failure(struct se_cmd *, int, int);
1646
695434e1
NB		 1647/*
1648 * Used by fabric module frontends to queue tasks directly.
1649 * Many only be used from process context only
1650 */
1651int transport_handle_cdb_direct(
1652 struct se_cmd *cmd)
1653{
dd8ae59d
NB		 1654 int ret;
1655
695434e1
NB		 1656 if (!cmd->se_lun) {
1657 dump_stack();
6708bb27 1658 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1659 return -EINVAL;
1660 }
1661 if (in_interrupt()) {
1662 dump_stack();
6708bb27 1663 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1664 " from interrupt context\n");
1665 return -EINVAL;
1666 }
dd8ae59d
NB		 1667 /*
1668 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1669 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1670 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1671 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1672 *
1673 * Also, we don't take cmd->t_state_lock here as we only expect
1674 * this to be called for initial descriptor submission.
1675 */
1676 cmd->t_state = TRANSPORT_NEW_CMD;
1677 atomic_set(&cmd->t_transport_active, 1);
1678 /*
1679 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1680 * so follow TRANSPORT_NEW_CMD processing thread context usage
1681 * and call transport_generic_request_failure() if necessary..
1682 */
1683 ret = transport_generic_new_cmd(cmd);
1684 if (ret == -EAGAIN)
1685 return 0;
1686 else if (ret < 0) {
1687 cmd->transport_error_status = ret;
4499dda8 1688 transport_generic_request_failure(cmd, 0,
dd8ae59d
NB		 1689 (cmd->data_direction != DMA_TO_DEVICE));
1690 }
1691 return 0;
695434e1
NB		 1692}
1693EXPORT_SYMBOL(transport_handle_cdb_direct);
1694
c66ac9db
NB		 1695/*
1696 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1697 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1698 * complete setup in TCM process context w/ TFO->new_cmd_map().
1699 */
1700int transport_generic_handle_cdb_map(
1701 struct se_cmd *cmd)
1702{
e3d6f909 1703 if (!cmd->se_lun) {
c66ac9db 1704 dump_stack();
6708bb27 1705 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1706 return -EINVAL;
c66ac9db
NB		 1707 }
1708
f7a5cc0b 1709 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1710 return 0;
1711}
1712EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1713
1714/* transport_generic_handle_data():
1715 *
1716 *
1717 */
1718int transport_generic_handle_data(
1719 struct se_cmd *cmd)
1720{
1721 /*
1722 * For the software fabric case, then we assume the nexus is being
1723 * failed/shutdown when signals are pending from the kthread context
1724 * caller, so we return a failure. For the HW target mode case running
1725 * in interrupt code, the signal_pending() check is skipped.
1726 */
1727 if (!in_interrupt() && signal_pending(current))
e3d6f909 1728 return -EPERM;
c66ac9db
NB		 1729 /*
1730 * If the received CDB has aleady been ABORTED by the generic
1731 * target engine, we now call transport_check_aborted_status()
1732 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1733 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1734 * sequences at this point.
1735 */
1736 if (transport_check_aborted_status(cmd, 1) != 0)
1737 return 0;
1738
f7a5cc0b 1739 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1740 return 0;
1741}
1742EXPORT_SYMBOL(transport_generic_handle_data);
1743
1744/* transport_generic_handle_tmr():
1745 *
1746 *
1747 */
1748int transport_generic_handle_tmr(
1749 struct se_cmd *cmd)
1750{
f7a5cc0b 1751 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1752 return 0;
1753}
1754EXPORT_SYMBOL(transport_generic_handle_tmr);
1755
f4366772
NB		 1756void transport_generic_free_cmd_intr(
1757 struct se_cmd *cmd)
1758{
f7a5cc0b 1759 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
f4366772
NB		 1760}
1761EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1762
cdbb70bb
CH		 1763/*
1764 * If the task is active, request it to be stopped and sleep until it
1765 * has completed.
1766 */
1767bool target_stop_task(struct se_task *task, unsigned long *flags)
1768{
1769 struct se_cmd *cmd = task->task_se_cmd;
1770 bool was_active = false;
1771
1772 if (task->task_flags & TF_ACTIVE) {
1773 task->task_flags |= TF_REQUEST_STOP;
1774 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1775
1776 pr_debug("Task %p waiting to complete\n", task);
cc5d0f0f 1777 del_timer_sync(&task->task_timer);
cdbb70bb
CH		 1778 wait_for_completion(&task->task_stop_comp);
1779 pr_debug("Task %p stopped successfully\n", task);
1780
1781 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1782 atomic_dec(&cmd->t_task_cdbs_left);
1783 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1784 was_active = true;
1785 }
1786
cdbb70bb
CH		 1787 return was_active;
1788}
1789
c66ac9db
NB		 1790static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1791{
1792 struct se_task *task, *task_tmp;
1793 unsigned long flags;
1794 int ret = 0;
1795
6708bb27 1796 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1797 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1798
1799 /*
1800 * No tasks remain in the execution queue
1801 */
a1d8b49a 1802 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1803 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1804 &cmd->t_task_list, t_list) {
04629b7b 1805 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1806 /*
1807 * If the struct se_task has not been sent and is not active,
1808 * remove the struct se_task from the execution queue.
1809 */
6c76bf95 1810 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1811 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1812 flags);
1813 transport_remove_task_from_execute_queue(task,
42bf829e 1814 cmd->se_dev);
c66ac9db 1815
04629b7b 1816 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1817 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1818 continue;
1819 }
1820
cdbb70bb 1821 if (!target_stop_task(task, &flags)) {
04629b7b 1822 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1823 ret++;
1824 }
c66ac9db 1825 }
a1d8b49a 1826 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1827
1828 return ret;
1829}
1830
c66ac9db
NB		 1831/*
1832 * Handle SAM-esque emulation for generic transport request failures.
1833 */
1834static void transport_generic_request_failure(
1835 struct se_cmd *cmd,
c66ac9db
NB		 1836 int complete,
1837 int sc)
1838{
07bde79a
NB		 1839 int ret = 0;
1840
6708bb27 1841 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1842 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1843 cmd->t_task_cdb[0]);
f2da9dbd 1844 pr_debug("-----[ i_state: %d t_state: %d transport_error_status: %d\n",
e3d6f909 1845 cmd->se_tfo->get_cmd_state(cmd),
f2da9dbd 1846 cmd->t_state,
c66ac9db 1847 cmd->transport_error_status);
6708bb27 1848 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1849 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1850 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1851 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1852 atomic_read(&cmd->t_task_cdbs_left),
1853 atomic_read(&cmd->t_task_cdbs_sent),
1854 atomic_read(&cmd->t_task_cdbs_ex_left),
1855 atomic_read(&cmd->t_transport_active),
1856 atomic_read(&cmd->t_transport_stop),
1857 atomic_read(&cmd->t_transport_sent));
c66ac9db 1858
c66ac9db
NB		 1859 /*
1860 * For SAM Task Attribute emulation for failed struct se_cmd
1861 */
1862 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1863 transport_complete_task_attr(cmd);
1864
1865 if (complete) {
1866 transport_direct_request_timeout(cmd);
1867 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1868 }
1869
1870 switch (cmd->transport_error_status) {
1871 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1872 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1873 break;
1874 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1875 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1876 break;
1877 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1878 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1879 break;
1880 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1881 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1882 break;
1883 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1884 if (!sc)
1885 transport_new_cmd_failure(cmd);
1886 /*
1887 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1888 * we force this session to fall back to session
1889 * recovery.
1890 */
e3d6f909
AG		 1891 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1892 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 1893
1894 goto check_stop;
1895 case PYX_TRANSPORT_LU_COMM_FAILURE:
1896 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1897 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1898 break;
1899 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1900 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1901 break;
1902 case PYX_TRANSPORT_WRITE_PROTECTED:
1903 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1904 break;
1905 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1906 /*
1907 * No SENSE Data payload for this case, set SCSI Status
1908 * and queue the response to $FABRIC_MOD.
1909 *
1910 * Uses linux/include/scsi/scsi.h SAM status codes defs
1911 */
1912 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1913 /*
1914 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1915 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1916 * CONFLICT STATUS.
1917 *
1918 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1919 */
e3d6f909
AG		 1920 if (cmd->se_sess &&
1921 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1922 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1923 cmd->orig_fe_lun, 0x2C,
1924 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1925
07bde79a
NB		 1926 ret = cmd->se_tfo->queue_status(cmd);
1927 if (ret == -EAGAIN)
1928 goto queue_full;
c66ac9db
NB		 1929 goto check_stop;
1930 case PYX_TRANSPORT_USE_SENSE_REASON:
1931 /*
1932 * struct se_cmd->scsi_sense_reason already set
1933 */
1934 break;
1935 default:
6708bb27 1936 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 1937 cmd->t_task_cdb[0],
c66ac9db
NB		 1938 cmd->transport_error_status);
1939 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1940 break;
1941 }
16ab8e60
NB		 1942 /*
1943 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1944 * make the call to transport_send_check_condition_and_sense()
1945 * directly. Otherwise expect the fabric to make the call to
1946 * transport_send_check_condition_and_sense() after handling
1947 * possible unsoliticied write data payloads.
1948 */
1949 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 1950 transport_new_cmd_failure(cmd);
07bde79a
NB		 1951 else {
1952 ret = transport_send_check_condition_and_sense(cmd,
1953 cmd->scsi_sense_reason, 0);
1954 if (ret == -EAGAIN)
1955 goto queue_full;
1956 }
1957
c66ac9db
NB		 1958check_stop:
1959 transport_lun_remove_cmd(cmd);
6708bb27 1960 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1961 ;
07bde79a
NB		 1962 return;
1963
1964queue_full:
e057f533
CH		 1965 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1966 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1967}
1968
1969static void transport_direct_request_timeout(struct se_cmd *cmd)
1970{
1971 unsigned long flags;
1972
a1d8b49a 1973 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 1974 if (!atomic_read(&cmd->t_transport_timeout)) {
a1d8b49a 1975 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1976 return;
1977 }
a1d8b49a
AG		 1978 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
1979 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1980 return;
1981 }
1982
a1d8b49a
AG		 1983 atomic_sub(atomic_read(&cmd->t_transport_timeout),
1984 &cmd->t_se_count);
1985 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1986}
1987
1988static void transport_generic_request_timeout(struct se_cmd *cmd)
1989{
1990 unsigned long flags;
1991
1992 /*
e6a2573f 1993 * Reset cmd->t_se_count to allow transport_put_cmd()
c66ac9db
NB		 1994 * to allow last call to free memory resources.
1995 */
a1d8b49a
AG		 1996 spin_lock_irqsave(&cmd->t_state_lock, flags);
1997 if (atomic_read(&cmd->t_transport_timeout) > 1) {
1998 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 1999
a1d8b49a 2000 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2001 }
a1d8b49a 2002 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2003
e6a2573f 2004 transport_put_cmd(cmd);
c66ac9db
NB		 2005}
2006
c66ac9db
NB		 2007static inline u32 transport_lba_21(unsigned char *cdb)
2008{
2009 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2010}
2011
2012static inline u32 transport_lba_32(unsigned char *cdb)
2013{
2014 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2015}
2016
2017static inline unsigned long long transport_lba_64(unsigned char *cdb)
2018{
2019 unsigned int __v1, __v2;
2020
2021 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2022 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2023
2024 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2025}
2026
2027/*
2028 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2029 */
2030static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2031{
2032 unsigned int __v1, __v2;
2033
2034 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2035 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2036
2037 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2038}
2039
2040static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2041{
2042 unsigned long flags;
2043
a1d8b49a 2044 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2045 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2046 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2047}
2048
2049/*
2050 * Called from interrupt context.
2051 */
2052static void transport_task_timeout_handler(unsigned long data)
2053{
2054 struct se_task *task = (struct se_task *)data;
e3d6f909 2055 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2056 unsigned long flags;
2057
6708bb27 2058 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
c66ac9db 2059
a1d8b49a 2060 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2061
2062 /*
2063 * Determine if transport_complete_task() has already been called.
2064 */
6c76bf95
CH		 2065 if (!(task->task_flags & TF_ACTIVE)) {
2066 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2067 task, cmd);
a1d8b49a 2068 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2069 return;
2070 }
2071
a1d8b49a
AG		 2072 atomic_inc(&cmd->t_se_count);
2073 atomic_inc(&cmd->t_transport_timeout);
2074 cmd->t_tasks_failed = 1;
c66ac9db 2075
6c76bf95 2076 task->task_flags |= TF_TIMEOUT;
c66ac9db
NB		 2077 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2078 task->task_scsi_status = 1;
2079
6c76bf95
CH		 2080 if (task->task_flags & TF_REQUEST_STOP) {
2081 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
c66ac9db 2082 " == 1\n", task, cmd);
a1d8b49a 2083 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2084 complete(&task->task_stop_comp);
2085 return;
2086 }
2087
6708bb27
AG		 2088 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2089 pr_debug("transport task: %p cmd: %p timeout non zero"
c66ac9db 2090 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2091 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2092 return;
2093 }
6708bb27 2094 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
c66ac9db
NB		 2095 task, cmd);
2096
2097 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
a1d8b49a 2098 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2099
f7a5cc0b 2100 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE, false);
c66ac9db
NB		 2101}
2102
c66ac9db
NB		 2103static void transport_start_task_timer(struct se_task *task)
2104{
42bf829e 2105 struct se_device *dev = task->task_se_cmd->se_dev;
c66ac9db
NB		 2106 int timeout;
2107
c66ac9db
NB		 2108 /*
2109 * If the task_timeout is disabled, exit now.
2110 */
e3d6f909 2111 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
6708bb27 2112 if (!timeout)
c66ac9db
NB		 2113 return;
2114
c66ac9db
NB		 2115 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2116 task->task_timer.data = (unsigned long) task;
2117 task->task_timer.function = transport_task_timeout_handler;
c66ac9db 2118 add_timer(&task->task_timer);
c66ac9db
NB		 2119}
2120
2121static inline int transport_tcq_window_closed(struct se_device *dev)
2122{
2123 if (dev->dev_tcq_window_closed++ <
2124 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2125 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2126 } else
2127 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2128
e3d6f909 2129 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2130 return 0;
2131}
2132
2133/*
2134 * Called from Fabric Module context from transport_execute_tasks()
2135 *
2136 * The return of this function determins if the tasks from struct se_cmd
2137 * get added to the execution queue in transport_execute_tasks(),
2138 * or are added to the delayed or ordered lists here.
2139 */
2140static inline int transport_execute_task_attr(struct se_cmd *cmd)
2141{
5951146d 2142 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2143 return 1;
2144 /*
25985edc 2145 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2146 * to allow the passed struct se_cmd list of tasks to the front of the list.
2147 */
e66ecd50 2148 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2149 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2150 smp_mb__after_atomic_inc();
6708bb27 2151 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2152 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2153 cmd->t_task_cdb[0],
c66ac9db
NB		 2154 cmd->se_ordered_id);
2155 return 1;
e66ecd50 2156 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2157 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2158 list_add_tail(&cmd->se_ordered_node,
2159 &cmd->se_dev->ordered_cmd_list);
2160 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2161
5951146d 2162 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2163 smp_mb__after_atomic_inc();
2164
6708bb27 2165 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2166 " list, se_ordered_id: %u\n",
a1d8b49a 2167 cmd->t_task_cdb[0],
c66ac9db
NB		 2168 cmd->se_ordered_id);
2169 /*
2170 * Add ORDERED command to tail of execution queue if
2171 * no other older commands exist that need to be
2172 * completed first.
2173 */
6708bb27 2174 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2175 return 1;
2176 } else {
2177 /*
2178 * For SIMPLE and UNTAGGED Task Attribute commands
2179 */
5951146d 2180 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2181 smp_mb__after_atomic_inc();
2182 }
2183 /*
2184 * Otherwise if one or more outstanding ORDERED task attribute exist,
2185 * add the dormant task(s) built for the passed struct se_cmd to the
2186 * execution queue and become in Active state for this struct se_device.
2187 */
5951146d 2188 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2189 /*
2190 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2191 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2192 */
5951146d 2193 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2194 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2195 list_add_tail(&cmd->se_delayed_node,
2196 &cmd->se_dev->delayed_cmd_list);
2197 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2198
6708bb27 2199 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2200 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2201 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2202 cmd->se_ordered_id);
2203 /*
2204 * Return zero to let transport_execute_tasks() know
2205 * not to add the delayed tasks to the execution list.
2206 */
2207 return 0;
2208 }
2209 /*
2210 * Otherwise, no ORDERED task attributes exist..
2211 */
2212 return 1;
2213}
2214
2215/*
2216 * Called from fabric module context in transport_generic_new_cmd() and
2217 * transport_generic_process_write()
2218 */
2219static int transport_execute_tasks(struct se_cmd *cmd)
2220{
2221 int add_tasks;
2222
db1620a2
CH		 2223 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2224 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
4499dda8 2225 transport_generic_request_failure(cmd, 0, 1);
db1620a2 2226 return 0;
c66ac9db 2227 }
db1620a2 2228
c66ac9db
NB		 2229 /*
2230 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2231 * has occurred that prevents execution.
c66ac9db 2232 */
6708bb27 2233 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2234 /*
2235 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2236 * attribute for the tasks of the received struct se_cmd CDB
2237 */
2238 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2239 if (!add_tasks)
c66ac9db
NB		 2240 goto execute_tasks;
2241 /*
2242 * This calls transport_add_tasks_from_cmd() to handle
2243 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2244 * (if enabled) in __transport_add_task_to_execute_queue() and
2245 * transport_add_task_check_sam_attr().
2246 */
2247 transport_add_tasks_from_cmd(cmd);
2248 }
2249 /*
2250 * Kick the execution queue for the cmd associated struct se_device
2251 * storage object.
2252 */
2253execute_tasks:
5951146d 2254 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2255 return 0;
2256}
2257
2258/*
2259 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2260 * from struct se_device->execute_task_list and
2261 *
2262 * Called from transport_processing_thread()
2263 */
2264static int __transport_execute_tasks(struct se_device *dev)
2265{
2266 int error;
2267 struct se_cmd *cmd = NULL;
e3d6f909 2268 struct se_task *task = NULL;
c66ac9db
NB		 2269 unsigned long flags;
2270
2271 /*
2272 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2273 * struct se_tasks to the selected transport.
c66ac9db
NB		 2274 */
2275check_depth:
e3d6f909 2276 if (!atomic_read(&dev->depth_left))
c66ac9db 2277 return transport_tcq_window_closed(dev);
c66ac9db 2278
e3d6f909 2279 dev->dev_tcq_window_closed = 0;
c66ac9db 2280
e3d6f909
AG		 2281 spin_lock_irq(&dev->execute_task_lock);
2282 if (list_empty(&dev->execute_task_list)) {
2283 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2284 return 0;
2285 }
e3d6f909
AG		 2286 task = list_first_entry(&dev->execute_task_list,
2287 struct se_task, t_execute_list);
04629b7b 2288 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2289 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2290
2291 atomic_dec(&dev->depth_left);
c66ac9db 2292
e3d6f909 2293 cmd = task->task_se_cmd;
c66ac9db 2294
a1d8b49a 2295 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2296 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2297 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2298
a1d8b49a
AG		 2299 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2300 cmd->t_task_list_num)
c66ac9db
NB		 2301 atomic_set(&cmd->transport_sent, 1);
2302
2303 transport_start_task_timer(task);
a1d8b49a 2304 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2305 /*
2306 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2307 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2308 * struct se_subsystem_api->do_task() caller below.
2309 */
2310 if (cmd->transport_emulate_cdb) {
2311 error = cmd->transport_emulate_cdb(cmd);
2312 if (error != 0) {
2313 cmd->transport_error_status = error;
6c76bf95
CH		 2314 spin_lock_irqsave(&cmd->t_state_lock, flags);
2315 task->task_flags &= ~TF_ACTIVE;
2316 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cc5d0f0f 2317 del_timer_sync(&task->task_timer);
c66ac9db
NB		 2318 atomic_set(&cmd->transport_sent, 0);
2319 transport_stop_tasks_for_cmd(cmd);
4499dda8
CH		 2320 atomic_inc(&dev->depth_left);
2321 transport_generic_request_failure(cmd, 0, 1);
c66ac9db
NB		 2322 goto check_depth;
2323 }
2324 /*
2325 * Handle the successful completion for transport_emulate_cdb()
2326 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2327 * Otherwise the caller is expected to complete the task with
2328 * proper status.
2329 */
2330 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2331 cmd->scsi_status = SAM_STAT_GOOD;
2332 task->task_scsi_status = GOOD;
2333 transport_complete_task(task, 1);
2334 }
2335 } else {
2336 /*
2337 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2338 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2339 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2340 * LUN emulation code.
2341 *
2342 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2343 * call ->do_task() directly and let the underlying TCM subsystem plugin
2344 * code handle the CDB emulation.
2345 */
e3d6f909
AG		 2346 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2347 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2348 error = transport_emulate_control_cdb(task);
2349 else
e3d6f909 2350 error = dev->transport->do_task(task);
c66ac9db
NB		 2351
2352 if (error != 0) {
2353 cmd->transport_error_status = error;
6c76bf95
CH		 2354 spin_lock_irqsave(&cmd->t_state_lock, flags);
2355 task->task_flags &= ~TF_ACTIVE;
2356 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cc5d0f0f 2357 del_timer_sync(&task->task_timer);
c66ac9db
NB		 2358 atomic_set(&cmd->transport_sent, 0);
2359 transport_stop_tasks_for_cmd(cmd);
4499dda8
CH		 2360 atomic_inc(&dev->depth_left);
2361 transport_generic_request_failure(cmd, 0, 1);
c66ac9db
NB		 2362 }
2363 }
2364
2365 goto check_depth;
2366
2367 return 0;
2368}
2369
2370void transport_new_cmd_failure(struct se_cmd *se_cmd)
2371{
2372 unsigned long flags;
2373 /*
2374 * Any unsolicited data will get dumped for failed command inside of
2375 * the fabric plugin
2376 */
a1d8b49a 2377 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2378 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2379 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2380 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2381}
2382
c66ac9db
NB		 2383static inline u32 transport_get_sectors_6(
2384 unsigned char *cdb,
2385 struct se_cmd *cmd,
2386 int *ret)
2387{
5951146d 2388 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2389
2390 /*
2391 * Assume TYPE_DISK for non struct se_device objects.
2392 * Use 8-bit sector value.
2393 */
2394 if (!dev)
2395 goto type_disk;
2396
2397 /*
2398 * Use 24-bit allocation length for TYPE_TAPE.
2399 */
e3d6f909 2400 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2401 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2402
2403 /*
2404 * Everything else assume TYPE_DISK Sector CDB location.
2405 * Use 8-bit sector value.
2406 */
2407type_disk:
2408 return (u32)cdb[4];
2409}
2410
2411static inline u32 transport_get_sectors_10(
2412 unsigned char *cdb,
2413 struct se_cmd *cmd,
2414 int *ret)
2415{
5951146d 2416 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2417
2418 /*
2419 * Assume TYPE_DISK for non struct se_device objects.
2420 * Use 16-bit sector value.
2421 */
2422 if (!dev)
2423 goto type_disk;
2424
2425 /*
2426 * XXX_10 is not defined in SSC, throw an exception
2427 */
e3d6f909
AG		 2428 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2429 *ret = -EINVAL;
c66ac9db
NB		 2430 return 0;
2431 }
2432
2433 /*
2434 * Everything else assume TYPE_DISK Sector CDB location.
2435 * Use 16-bit sector value.
2436 */
2437type_disk:
2438 return (u32)(cdb[7] << 8) + cdb[8];
2439}
2440
2441static inline u32 transport_get_sectors_12(
2442 unsigned char *cdb,
2443 struct se_cmd *cmd,
2444 int *ret)
2445{
5951146d 2446 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2447
2448 /*
2449 * Assume TYPE_DISK for non struct se_device objects.
2450 * Use 32-bit sector value.
2451 */
2452 if (!dev)
2453 goto type_disk;
2454
2455 /*
2456 * XXX_12 is not defined in SSC, throw an exception
2457 */
e3d6f909
AG		 2458 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2459 *ret = -EINVAL;
c66ac9db
NB		 2460 return 0;
2461 }
2462
2463 /*
2464 * Everything else assume TYPE_DISK Sector CDB location.
2465 * Use 32-bit sector value.
2466 */
2467type_disk:
2468 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2469}
2470
2471static inline u32 transport_get_sectors_16(
2472 unsigned char *cdb,
2473 struct se_cmd *cmd,
2474 int *ret)
2475{
5951146d 2476 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2477
2478 /*
2479 * Assume TYPE_DISK for non struct se_device objects.
2480 * Use 32-bit sector value.
2481 */
2482 if (!dev)
2483 goto type_disk;
2484
2485 /*
2486 * Use 24-bit allocation length for TYPE_TAPE.
2487 */
e3d6f909 2488 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2489 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2490
2491type_disk:
2492 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2493 (cdb[12] << 8) + cdb[13];
2494}
2495
2496/*
2497 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2498 */
2499static inline u32 transport_get_sectors_32(
2500 unsigned char *cdb,
2501 struct se_cmd *cmd,
2502 int *ret)
2503{
2504 /*
2505 * Assume TYPE_DISK for non struct se_device objects.
2506 * Use 32-bit sector value.
2507 */
2508 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2509 (cdb[30] << 8) + cdb[31];
2510
2511}
2512
2513static inline u32 transport_get_size(
2514 u32 sectors,
2515 unsigned char *cdb,
2516 struct se_cmd *cmd)
2517{
5951146d 2518 struct se_device *dev = cmd->se_dev;
c66ac9db 2519
e3d6f909 2520 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2521 if (cdb[1] & 1) { /* sectors */
e3d6f909 2522 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2523 } else /* bytes */
2524 return sectors;
2525 }
2526#if 0
6708bb27 2527 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2528 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2529 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2530 dev->transport->name);
c66ac9db 2531#endif
e3d6f909 2532 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2533}
2534
c66ac9db
NB		 2535static void transport_xor_callback(struct se_cmd *cmd)
2536{
2537 unsigned char *buf, *addr;
ec98f782 2538 struct scatterlist *sg;
c66ac9db
NB		 2539 unsigned int offset;
2540 int i;
ec98f782 2541 int count;
c66ac9db
NB		 2542 /*
2543 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2544 *
2545 * 1) read the specified logical block(s);
2546 * 2) transfer logical blocks from the data-out buffer;
2547 * 3) XOR the logical blocks transferred from the data-out buffer with
2548 * the logical blocks read, storing the resulting XOR data in a buffer;
2549 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2550 * blocks transferred from the data-out buffer; and
2551 * 5) transfer the resulting XOR data to the data-in buffer.
2552 */
2553 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2554 if (!buf) {
2555 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2556 return;
2557 }
2558 /*
ec98f782 2559 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2560 * into the locally allocated *buf
2561 */
ec98f782
AG		 2562 sg_copy_to_buffer(cmd->t_data_sg,
2563 cmd->t_data_nents,
2564 buf,
2565 cmd->data_length);
2566
c66ac9db
NB		 2567 /*
2568 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2569 * cmd->t_mem_bidi_list
c66ac9db
NB		 2570 */
2571
2572 offset = 0;
ec98f782
AG		 2573 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2574 addr = kmap_atomic(sg_page(sg), KM_USER0);
2575 if (!addr)
c66ac9db
NB		 2576 goto out;
2577
ec98f782
AG		 2578 for (i = 0; i < sg->length; i++)
2579 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2580
ec98f782 2581 offset += sg->length;
c66ac9db
NB		 2582 kunmap_atomic(addr, KM_USER0);
2583 }
ec98f782 2584
c66ac9db
NB		 2585out:
2586 kfree(buf);
2587}
2588
2589/*
2590 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2591 */
2592static int transport_get_sense_data(struct se_cmd *cmd)
2593{
2594 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2595 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2596 struct se_task *task = NULL, *task_tmp;
2597 unsigned long flags;
2598 u32 offset = 0;
2599
e3d6f909
AG		 2600 WARN_ON(!cmd->se_lun);
2601
42bf829e
CH		 2602 if (!dev)
2603 return 0;
2604
a1d8b49a 2605 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2606 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2607 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2608 return 0;
2609 }
2610
2611 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2612 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2613 if (!task->task_sense)
2614 continue;
2615
e3d6f909 2616 if (!dev->transport->get_sense_buffer) {
6708bb27 2617 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2618 " is NULL\n");
2619 continue;
2620 }
2621
e3d6f909 2622 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2623 if (!sense_buffer) {
04629b7b 2624 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2625 " sense buffer for task with sense\n",
04629b7b 2626 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2627 continue;
2628 }
a1d8b49a 2629 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2630
e3d6f909 2631 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2632 TRANSPORT_SENSE_BUFFER);
2633
5951146d 2634 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2635 TRANSPORT_SENSE_BUFFER);
2636 cmd->scsi_status = task->task_scsi_status;
2637 /* Automatically padded */
2638 cmd->scsi_sense_length =
2639 (TRANSPORT_SENSE_BUFFER + offset);
2640
6708bb27 2641 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2642 " and sense\n",
e3d6f909 2643 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2644 cmd->scsi_status);
2645 return 0;
2646 }
a1d8b49a 2647 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2648
2649 return -1;
2650}
2651
c66ac9db
NB		 2652static int
2653transport_handle_reservation_conflict(struct se_cmd *cmd)
2654{
c66ac9db
NB		 2655 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2656 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2657 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2658 /*
2659 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2660 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2661 * CONFLICT STATUS.
2662 *
2663 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2664 */
e3d6f909
AG		 2665 if (cmd->se_sess &&
2666 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2667 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2668 cmd->orig_fe_lun, 0x2C,
2669 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2670 return -EINVAL;
c66ac9db
NB		 2671}
2672
ec98f782
AG		 2673static inline long long transport_dev_end_lba(struct se_device *dev)
2674{
2675 return dev->transport->get_blocks(dev) + 1;
2676}
2677
2678static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2679{
2680 struct se_device *dev = cmd->se_dev;
2681 u32 sectors;
2682
2683 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2684 return 0;
2685
2686 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2687
6708bb27
AG		 2688 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2689 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2690 " transport_dev_end_lba(): %llu\n",
2691 cmd->t_task_lba, sectors,
2692 transport_dev_end_lba(dev));
7abbe7f3 2693 return -EINVAL;
ec98f782
AG		 2694 }
2695
7abbe7f3 2696 return 0;
ec98f782
AG		 2697}
2698
706d5860
NB		 2699static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2700{
2701 /*
2702 * Determine if the received WRITE_SAME is used to for direct
2703 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2704 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2705 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2706 */
2707 int passthrough = (dev->transport->transport_type ==
2708 TRANSPORT_PLUGIN_PHBA_PDEV);
2709
2710 if (!passthrough) {
2711 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2712 pr_err("WRITE_SAME PBDATA and LBDATA"
2713 " bits not supported for Block Discard"
2714 " Emulation\n");
2715 return -ENOSYS;
2716 }
2717 /*
2718 * Currently for the emulated case we only accept
2719 * tpws with the UNMAP=1 bit set.
2720 */
2721 if (!(flags[0] & 0x08)) {
2722 pr_err("WRITE_SAME w/o UNMAP bit not"
2723 " supported for Block Discard Emulation\n");
2724 return -ENOSYS;
2725 }
2726 }
2727
2728 return 0;
2729}
2730
c66ac9db
NB		 2731/* transport_generic_cmd_sequencer():
2732 *
2733 * Generic Command Sequencer that should work for most DAS transport
2734 * drivers.
2735 *
2736 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2737 * RX Thread.
2738 *
2739 * FIXME: Need to support other SCSI OPCODES where as well.
2740 */
2741static int transport_generic_cmd_sequencer(
2742 struct se_cmd *cmd,
2743 unsigned char *cdb)
2744{
5951146d 2745 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2746 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2747 int ret = 0, sector_ret = 0, passthrough;
2748 u32 sectors = 0, size = 0, pr_reg_type = 0;
2749 u16 service_action;
2750 u8 alua_ascq = 0;
2751 /*
2752 * Check for an existing UNIT ATTENTION condition
2753 */
2754 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2755 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2756 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2757 return -EINVAL;
c66ac9db
NB		 2758 }
2759 /*
2760 * Check status of Asymmetric Logical Unit Assignment port
2761 */
e3d6f909 2762 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2763 if (ret != 0) {
c66ac9db 2764 /*
25985edc 2765 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2766 * The ALUA additional sense code qualifier (ASCQ) is determined
2767 * by the ALUA primary or secondary access state..
2768 */
2769 if (ret > 0) {
2770#if 0
6708bb27 2771 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2772 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2773 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2774#endif
2775 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2776 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2777 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2778 return -EINVAL;
c66ac9db
NB		 2779 }
2780 goto out_invalid_cdb_field;
2781 }
2782 /*
2783 * Check status for SPC-3 Persistent Reservations
2784 */
e3d6f909
AG		 2785 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2786 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2787 cmd, cdb, pr_reg_type) != 0)
2788 return transport_handle_reservation_conflict(cmd);
2789 /*
2790 * This means the CDB is allowed for the SCSI Initiator port
2791 * when said port is *NOT* holding the legacy SPC-2 or
2792 * SPC-3 Persistent Reservation.
2793 */
2794 }
2795
2796 switch (cdb[0]) {
2797 case READ_6:
2798 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2799 if (sector_ret)
2800 goto out_unsupported_cdb;
2801 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2802 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2803 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2804 break;
2805 case READ_10:
2806 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2807 if (sector_ret)
2808 goto out_unsupported_cdb;
2809 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2810 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2811 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2812 break;
2813 case READ_12:
2814 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2815 if (sector_ret)
2816 goto out_unsupported_cdb;
2817 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2818 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2819 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2820 break;
2821 case READ_16:
2822 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2823 if (sector_ret)
2824 goto out_unsupported_cdb;
2825 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2826 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2827 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2828 break;
2829 case WRITE_6:
2830 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2831 if (sector_ret)
2832 goto out_unsupported_cdb;
2833 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2834 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2835 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2836 break;
2837 case WRITE_10:
2838 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2839 if (sector_ret)
2840 goto out_unsupported_cdb;
2841 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2842 cmd->t_task_lba = transport_lba_32(cdb);
2843 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2844 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2845 break;
2846 case WRITE_12:
2847 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2848 if (sector_ret)
2849 goto out_unsupported_cdb;
2850 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2851 cmd->t_task_lba = transport_lba_32(cdb);
2852 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2853 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2854 break;
2855 case WRITE_16:
2856 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2857 if (sector_ret)
2858 goto out_unsupported_cdb;
2859 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2860 cmd->t_task_lba = transport_lba_64(cdb);
2861 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2862 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2863 break;
2864 case XDWRITEREAD_10:
2865 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 2866 !(cmd->t_tasks_bidi))
c66ac9db
NB		 2867 goto out_invalid_cdb_field;
2868 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2869 if (sector_ret)
2870 goto out_unsupported_cdb;
2871 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2872 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2873 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 2874 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2875 TRANSPORT_PLUGIN_PHBA_PDEV);
2876 /*
2877 * Skip the remaining assignments for TCM/PSCSI passthrough
2878 */
2879 if (passthrough)
2880 break;
2881 /*
2882 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2883 */
2884 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2885 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2886 break;
2887 case VARIABLE_LENGTH_CMD:
2888 service_action = get_unaligned_be16(&cdb[8]);
2889 /*
2890 * Determine if this is TCM/PSCSI device and we should disable
2891 * internal emulation for this CDB.
2892 */
e3d6f909 2893 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2894 TRANSPORT_PLUGIN_PHBA_PDEV);
2895
2896 switch (service_action) {
2897 case XDWRITEREAD_32:
2898 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2899 if (sector_ret)
2900 goto out_unsupported_cdb;
2901 size = transport_get_size(sectors, cdb, cmd);
2902 /*
2903 * Use WRITE_32 and READ_32 opcodes for the emulated
2904 * XDWRITE_READ_32 logic.
2905 */
a1d8b49a 2906 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2907 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2908
2909 /*
2910 * Skip the remaining assignments for TCM/PSCSI passthrough
2911 */
2912 if (passthrough)
2913 break;
2914
2915 /*
2916 * Setup BIDI XOR callback to be run during
2917 * transport_generic_complete_ok()
2918 */
2919 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2920 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 2921 break;
2922 case WRITE_SAME_32:
2923 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2924 if (sector_ret)
2925 goto out_unsupported_cdb;
dd3a5ad8 2926
6708bb27 2927 if (sectors)
12850626 2928 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2929 else {
2930 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2931 " supported\n");
2932 goto out_invalid_cdb_field;
2933 }
dd3a5ad8 2934
a1d8b49a 2935 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2936 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2937
706d5860 2938 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2939 goto out_invalid_cdb_field;
706d5860 2940
c66ac9db
NB		 2941 break;
2942 default:
6708bb27 2943 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2944 " 0x%04x not supported\n", service_action);
2945 goto out_unsupported_cdb;
2946 }
2947 break;
e434f1f1 2948 case MAINTENANCE_IN:
e3d6f909 2949 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2950 /* MAINTENANCE_IN from SCC-2 */
2951 /*
2952 * Check for emulated MI_REPORT_TARGET_PGS.
2953 */
2954 if (cdb[1] == MI_REPORT_TARGET_PGS) {
2955 cmd->transport_emulate_cdb =
e3d6f909 2956 (su_dev->t10_alua.alua_type ==
c66ac9db 2957 SPC3_ALUA_EMULATED) ?
e3d6f909 2958 core_emulate_report_target_port_groups :
c66ac9db
NB		 2959 NULL;
2960 }
2961 size = (cdb[6] << 24) | (cdb[7] << 16) |
2962 (cdb[8] << 8) | cdb[9];
2963 } else {
2964 /* GPCMD_SEND_KEY from multi media commands */
2965 size = (cdb[8] << 8) + cdb[9];
2966 }
05d1c7c0 2967 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2968 break;
2969 case MODE_SELECT:
2970 size = cdb[4];
2971 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2972 break;
2973 case MODE_SELECT_10:
2974 size = (cdb[7] << 8) + cdb[8];
2975 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2976 break;
2977 case MODE_SENSE:
2978 size = cdb[4];
05d1c7c0 2979 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2980 break;
2981 case MODE_SENSE_10:
2982 case GPCMD_READ_BUFFER_CAPACITY:
2983 case GPCMD_SEND_OPC:
2984 case LOG_SELECT:
2985 case LOG_SENSE:
2986 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2987 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2988 break;
2989 case READ_BLOCK_LIMITS:
2990 size = READ_BLOCK_LEN;
05d1c7c0 2991 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2992 break;
2993 case GPCMD_GET_CONFIGURATION:
2994 case GPCMD_READ_FORMAT_CAPACITIES:
2995 case GPCMD_READ_DISC_INFO:
2996 case GPCMD_READ_TRACK_RZONE_INFO:
2997 size = (cdb[7] << 8) + cdb[8];
2998 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2999 break;
3000 case PERSISTENT_RESERVE_IN:
3001 case PERSISTENT_RESERVE_OUT:
3002 cmd->transport_emulate_cdb =
e3d6f909 3003 (su_dev->t10_pr.res_type ==
c66ac9db 3004 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3005 core_scsi3_emulate_pr : NULL;
c66ac9db 3006 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3007 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3008 break;
3009 case GPCMD_MECHANISM_STATUS:
3010 case GPCMD_READ_DVD_STRUCTURE:
3011 size = (cdb[8] << 8) + cdb[9];
3012 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3013 break;
3014 case READ_POSITION:
3015 size = READ_POSITION_LEN;
05d1c7c0 3016 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3017 break;
e434f1f1 3018 case MAINTENANCE_OUT:
e3d6f909 3019 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3020 /* MAINTENANCE_OUT from SCC-2
3021 *
3022 * Check for emulated MO_SET_TARGET_PGS.
3023 */
3024 if (cdb[1] == MO_SET_TARGET_PGS) {
3025 cmd->transport_emulate_cdb =
e3d6f909 3026 (su_dev->t10_alua.alua_type ==
c66ac9db 3027 SPC3_ALUA_EMULATED) ?
e3d6f909 3028 core_emulate_set_target_port_groups :
c66ac9db
NB		 3029 NULL;
3030 }
3031
3032 size = (cdb[6] << 24) | (cdb[7] << 16) |
3033 (cdb[8] << 8) | cdb[9];
3034 } else {
3035 /* GPCMD_REPORT_KEY from multi media commands */
3036 size = (cdb[8] << 8) + cdb[9];
3037 }
05d1c7c0 3038 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3039 break;
3040 case INQUIRY:
3041 size = (cdb[3] << 8) + cdb[4];
3042 /*
3043 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3044 * See spc4r17 section 5.3
3045 */
5951146d 3046 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3047 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3048 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3049 break;
3050 case READ_BUFFER:
3051 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3052 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3053 break;
3054 case READ_CAPACITY:
3055 size = READ_CAP_LEN;
05d1c7c0 3056 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3057 break;
3058 case READ_MEDIA_SERIAL_NUMBER:
3059 case SECURITY_PROTOCOL_IN:
3060 case SECURITY_PROTOCOL_OUT:
3061 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3062 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3063 break;
3064 case SERVICE_ACTION_IN:
3065 case ACCESS_CONTROL_IN:
3066 case ACCESS_CONTROL_OUT:
3067 case EXTENDED_COPY:
3068 case READ_ATTRIBUTE:
3069 case RECEIVE_COPY_RESULTS:
3070 case WRITE_ATTRIBUTE:
3071 size = (cdb[10] << 24) | (cdb[11] << 16) |
3072 (cdb[12] << 8) | cdb[13];
05d1c7c0 3073 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3074 break;
3075 case RECEIVE_DIAGNOSTIC:
3076 case SEND_DIAGNOSTIC:
3077 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3078 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3079 break;
3080/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3081#if 0
3082 case GPCMD_READ_CD:
3083 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3084 size = (2336 * sectors);
05d1c7c0 3085 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3086 break;
3087#endif
3088 case READ_TOC:
3089 size = cdb[8];
05d1c7c0 3090 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3091 break;
3092 case REQUEST_SENSE:
3093 size = cdb[4];
05d1c7c0 3094 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3095 break;
3096 case READ_ELEMENT_STATUS:
3097 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3098 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3099 break;
3100 case WRITE_BUFFER:
3101 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3102 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3103 break;
3104 case RESERVE:
3105 case RESERVE_10:
3106 /*
3107 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3108 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3109 */
3110 if (cdb[0] == RESERVE_10)
3111 size = (cdb[7] << 8) | cdb[8];
3112 else
3113 size = cmd->data_length;
3114
3115 /*
3116 * Setup the legacy emulated handler for SPC-2 and
3117 * >= SPC-3 compatible reservation handling (CRH=1)
3118 * Otherwise, we assume the underlying SCSI logic is
3119 * is running in SPC_PASSTHROUGH, and wants reservations
3120 * emulation disabled.
3121 */
3122 cmd->transport_emulate_cdb =
e3d6f909 3123 (su_dev->t10_pr.res_type !=
c66ac9db 3124 SPC_PASSTHROUGH) ?
e3d6f909 3125 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3126 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3127 break;
3128 case RELEASE:
3129 case RELEASE_10:
3130 /*
3131 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3132 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3133 */
3134 if (cdb[0] == RELEASE_10)
3135 size = (cdb[7] << 8) | cdb[8];
3136 else
3137 size = cmd->data_length;
3138
3139 cmd->transport_emulate_cdb =
e3d6f909 3140 (su_dev->t10_pr.res_type !=
c66ac9db 3141 SPC_PASSTHROUGH) ?
e3d6f909 3142 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3143 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3144 break;
3145 case SYNCHRONIZE_CACHE:
3146 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3147 /*
3148 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3149 */
3150 if (cdb[0] == SYNCHRONIZE_CACHE) {
3151 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3152 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3153 } else {
3154 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3155 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3156 }
3157 if (sector_ret)
3158 goto out_unsupported_cdb;
3159
3160 size = transport_get_size(sectors, cdb, cmd);
3161 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3162
3163 /*
3164 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3165 */
e3d6f909 3166 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3167 break;
3168 /*
3169 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3170 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3171 */
3172 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3173 /*
3174 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3175 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3176 */
7abbe7f3
NB		 3177 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3178 if (transport_cmd_get_valid_sectors(cmd) < 0)
3179 goto out_invalid_cdb_field;
3180 }
c66ac9db
NB		 3181 break;
3182 case UNMAP:
3183 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3184 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3185 break;
3186 case WRITE_SAME_16:
3187 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3188 if (sector_ret)
3189 goto out_unsupported_cdb;
dd3a5ad8 3190
6708bb27 3191 if (sectors)
12850626 3192 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3193 else {
3194 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3195 goto out_invalid_cdb_field;
3196 }
dd3a5ad8 3197
5db0753b 3198 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3199 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3200
3201 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3202 goto out_invalid_cdb_field;
3203 break;
3204 case WRITE_SAME:
3205 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3206 if (sector_ret)
3207 goto out_unsupported_cdb;
3208
3209 if (sectors)
12850626 3210 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3211 else {
3212 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3213 goto out_invalid_cdb_field;
c66ac9db 3214 }
706d5860
NB		 3215
3216 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3217 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3218 /*
3219 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3220 * of byte 1 bit 3 UNMAP instead of original reserved field
3221 */
3222 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3223 goto out_invalid_cdb_field;
c66ac9db
NB		 3224 break;
3225 case ALLOW_MEDIUM_REMOVAL:
3226 case GPCMD_CLOSE_TRACK:
3227 case ERASE:
3228 case INITIALIZE_ELEMENT_STATUS:
3229 case GPCMD_LOAD_UNLOAD:
3230 case REZERO_UNIT:
3231 case SEEK_10:
3232 case GPCMD_SET_SPEED:
3233 case SPACE:
3234 case START_STOP:
3235 case TEST_UNIT_READY:
3236 case VERIFY:
3237 case WRITE_FILEMARKS:
3238 case MOVE_MEDIUM:
3239 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3240 break;
3241 case REPORT_LUNS:
3242 cmd->transport_emulate_cdb =
e3d6f909 3243 transport_core_report_lun_response;
c66ac9db
NB		 3244 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3245 /*
3246 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3247 * See spc4r17 section 5.3
3248 */
5951146d 3249 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3250 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3251 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3252 break;
3253 default:
6708bb27 3254 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3255 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3256 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3257 goto out_unsupported_cdb;
3258 }
3259
3260 if (size != cmd->data_length) {
6708bb27 3261 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3262 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3263 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3264 cmd->data_length, size, cdb[0]);
3265
3266 cmd->cmd_spdtl = size;
3267
3268 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3269 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3270 " WRITE data\n");
3271 goto out_invalid_cdb_field;
3272 }
3273 /*
3274 * Reject READ_* or WRITE_* with overflow/underflow for
3275 * type SCF_SCSI_DATA_SG_IO_CDB.
3276 */
6708bb27
AG		 3277 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3278 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3279 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3280 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3281 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3282 goto out_invalid_cdb_field;
3283 }
3284
3285 if (size > cmd->data_length) {
3286 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3287 cmd->residual_count = (size - cmd->data_length);
3288 } else {
3289 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3290 cmd->residual_count = (cmd->data_length - size);
3291 }
3292 cmd->data_length = size;
3293 }
3294
d0229ae3
AG		 3295 /* Let's limit control cdbs to a page, for simplicity's sake. */
3296 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3297 size > PAGE_SIZE)
3298 goto out_invalid_cdb_field;
3299
c66ac9db
NB		 3300 transport_set_supported_SAM_opcode(cmd);
3301 return ret;
3302
3303out_unsupported_cdb:
3304 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3305 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3306 return -EINVAL;
c66ac9db
NB		 3307out_invalid_cdb_field:
3308 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3309 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3310 return -EINVAL;
c66ac9db
NB		 3311}
3312
c66ac9db
NB		 3313/*
3314 * Called from transport_generic_complete_ok() and
3315 * transport_generic_request_failure() to determine which dormant/delayed
3316 * and ordered cmds need to have their tasks added to the execution queue.
3317 */
3318static void transport_complete_task_attr(struct se_cmd *cmd)
3319{
5951146d 3320 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3321 struct se_cmd *cmd_p, *cmd_tmp;
3322 int new_active_tasks = 0;
3323
e66ecd50 3324 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3325 atomic_dec(&dev->simple_cmds);
3326 smp_mb__after_atomic_dec();
3327 dev->dev_cur_ordered_id++;
6708bb27 3328 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3329 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3330 cmd->se_ordered_id);
e66ecd50 3331 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3332 atomic_dec(&dev->dev_hoq_count);
3333 smp_mb__after_atomic_dec();
3334 dev->dev_cur_ordered_id++;
6708bb27 3335 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3336 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3337 cmd->se_ordered_id);
e66ecd50 3338 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3339 spin_lock(&dev->ordered_cmd_lock);
5951146d 3340 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3341 atomic_dec(&dev->dev_ordered_sync);
3342 smp_mb__after_atomic_dec();
3343 spin_unlock(&dev->ordered_cmd_lock);
3344
3345 dev->dev_cur_ordered_id++;
6708bb27 3346 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3347 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3348 }
3349 /*
3350 * Process all commands up to the last received
3351 * ORDERED task attribute which requires another blocking
3352 * boundary
3353 */
3354 spin_lock(&dev->delayed_cmd_lock);
3355 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3356 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3357
5951146d 3358 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3359 spin_unlock(&dev->delayed_cmd_lock);
3360
6708bb27 3361 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3362 " cmd_p: 0x%02x Task Attr: 0x%02x"
3363 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3364 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3365 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3366
3367 transport_add_tasks_from_cmd(cmd_p);
3368 new_active_tasks++;
3369
3370 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3371 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3372 break;
3373 }
3374 spin_unlock(&dev->delayed_cmd_lock);
3375 /*
3376 * If new tasks have become active, wake up the transport thread
3377 * to do the processing of the Active tasks.
3378 */
3379 if (new_active_tasks != 0)
e3d6f909 3380 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3381}
3382
e057f533 3383static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3384{
3385 int ret = 0;
3386
e057f533
CH		 3387 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3388 transport_complete_task_attr(cmd);
3389
3390 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3391 ret = cmd->se_tfo->queue_status(cmd);
3392 if (ret)
3393 goto out;
3394 }
07bde79a
NB		 3395
3396 switch (cmd->data_direction) {
3397 case DMA_FROM_DEVICE:
3398 ret = cmd->se_tfo->queue_data_in(cmd);
3399 break;
3400 case DMA_TO_DEVICE:
ec98f782 3401 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3402 ret = cmd->se_tfo->queue_data_in(cmd);
3403 if (ret < 0)
e057f533 3404 break;
07bde79a
NB		 3405 }
3406 /* Fall through for DMA_TO_DEVICE */
3407 case DMA_NONE:
3408 ret = cmd->se_tfo->queue_status(cmd);
3409 break;
3410 default:
3411 break;
3412 }
3413
e057f533
CH		 3414out:
3415 if (ret < 0) {
3416 transport_handle_queue_full(cmd, cmd->se_dev);
3417 return;
3418 }
3419 transport_lun_remove_cmd(cmd);
3420 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3421}
3422
3423static void transport_handle_queue_full(
3424 struct se_cmd *cmd,
e057f533 3425 struct se_device *dev)
07bde79a
NB		 3426{
3427 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3428 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3429 atomic_inc(&dev->dev_qf_count);
3430 smp_mb__after_atomic_inc();
3431 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3432
3433 schedule_work(&cmd->se_dev->qf_work_queue);
3434}
3435
c66ac9db
NB		 3436static void transport_generic_complete_ok(struct se_cmd *cmd)
3437{
07bde79a 3438 int reason = 0, ret;
c66ac9db
NB		 3439 /*
3440 * Check if we need to move delayed/dormant tasks from cmds on the
3441 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3442 * Attribute.
3443 */
5951146d 3444 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3445 transport_complete_task_attr(cmd);
07bde79a
NB		 3446 /*
3447 * Check to schedule QUEUE_FULL work, or execute an existing
3448 * cmd->transport_qf_callback()
3449 */
3450 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3451 schedule_work(&cmd->se_dev->qf_work_queue);
3452
c66ac9db
NB		 3453 /*
3454 * Check if we need to retrieve a sense buffer from
3455 * the struct se_cmd in question.
3456 */
3457 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3458 if (transport_get_sense_data(cmd) < 0)
3459 reason = TCM_NON_EXISTENT_LUN;
3460
3461 /*
3462 * Only set when an struct se_task->task_scsi_status returned
3463 * a non GOOD status.
3464 */
3465 if (cmd->scsi_status) {
07bde79a 3466 ret = transport_send_check_condition_and_sense(
c66ac9db 3467 cmd, reason, 1);
07bde79a
NB		 3468 if (ret == -EAGAIN)
3469 goto queue_full;
3470
c66ac9db
NB		 3471 transport_lun_remove_cmd(cmd);
3472 transport_cmd_check_stop_to_fabric(cmd);
3473 return;
3474 }
3475 }
3476 /*
25985edc 3477 * Check for a callback, used by amongst other things
c66ac9db
NB		 3478 * XDWRITE_READ_10 emulation.
3479 */
3480 if (cmd->transport_complete_callback)
3481 cmd->transport_complete_callback(cmd);
3482
3483 switch (cmd->data_direction) {
3484 case DMA_FROM_DEVICE:
3485 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3486 if (cmd->se_lun->lun_sep) {
3487 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3488 cmd->data_length;
3489 }
3490 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3491
07bde79a
NB		 3492 ret = cmd->se_tfo->queue_data_in(cmd);
3493 if (ret == -EAGAIN)
3494 goto queue_full;
c66ac9db
NB		 3495 break;
3496 case DMA_TO_DEVICE:
3497 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3498 if (cmd->se_lun->lun_sep) {
3499 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3500 cmd->data_length;
3501 }
3502 spin_unlock(&cmd->se_lun->lun_sep_lock);
3503 /*
3504 * Check if we need to send READ payload for BIDI-COMMAND
3505 */
ec98f782 3506 if (cmd->t_bidi_data_sg) {
c66ac9db 3507 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3508 if (cmd->se_lun->lun_sep) {
3509 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3510 cmd->data_length;
3511 }
3512 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3513 ret = cmd->se_tfo->queue_data_in(cmd);
3514 if (ret == -EAGAIN)
3515 goto queue_full;
c66ac9db
NB		 3516 break;
3517 }
3518 /* Fall through for DMA_TO_DEVICE */
3519 case DMA_NONE:
07bde79a
NB		 3520 ret = cmd->se_tfo->queue_status(cmd);
3521 if (ret == -EAGAIN)
3522 goto queue_full;
c66ac9db
NB		 3523 break;
3524 default:
3525 break;
3526 }
3527
3528 transport_lun_remove_cmd(cmd);
3529 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3530 return;
3531
3532queue_full:
6708bb27 3533 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3534 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3535 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3536 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3537}
3538
3539static void transport_free_dev_tasks(struct se_cmd *cmd)
3540{
3541 struct se_task *task, *task_tmp;
3542 unsigned long flags;
0c2cfe5f 3543 LIST_HEAD(dispose_list);
c66ac9db 3544
a1d8b49a 3545 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3546 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3547 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3548 if (!(task->task_flags & TF_ACTIVE))
3549 list_move_tail(&task->t_list, &dispose_list);
3550 }
3551 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3552
3553 while (!list_empty(&dispose_list)) {
3554 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3555
cc5d0f0f
CH		 3556 /*
3557 * We already cancelled all pending timers in
3558 * transport_complete_task, but that was just a pure del_timer,
3559 * so do a full del_timer_sync here to make sure any handler
3560 * that was running at that point has finished execution.
3561 */
3562 del_timer_sync(&task->task_timer);
3563
c66ac9db
NB		 3564 kfree(task->task_sg_bidi);
3565 kfree(task->task_sg);
3566
3567 list_del(&task->t_list);
3568
42bf829e 3569 cmd->se_dev->transport->free_task(task);
c66ac9db 3570 }
c66ac9db
NB		 3571}
3572
6708bb27 3573static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3574{
ec98f782 3575 struct scatterlist *sg;
ec98f782 3576 int count;
c66ac9db 3577
6708bb27
AG		 3578 for_each_sg(sgl, sg, nents, count)
3579 __free_page(sg_page(sg));
c66ac9db 3580
6708bb27
AG		 3581 kfree(sgl);
3582}
c66ac9db 3583
6708bb27
AG		 3584static inline void transport_free_pages(struct se_cmd *cmd)
3585{
3586 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3587 return;
3588
3589 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3590 cmd->t_data_sg = NULL;
3591 cmd->t_data_nents = 0;
c66ac9db 3592
6708bb27 3593 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3594 cmd->t_bidi_data_sg = NULL;
3595 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3596}
3597
d3df7825
CH		 3598/**
3599 * transport_put_cmd - release a reference to a command
3600 * @cmd: command to release
3601 *
3602 * This routine releases our reference to the command and frees it if possible.
3603 */
39c05f32 3604static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3605{
3606 unsigned long flags;
4911e3cc 3607 int free_tasks = 0;
c66ac9db 3608
a1d8b49a 3609 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3610 if (atomic_read(&cmd->t_fe_count)) {
3611 if (!atomic_dec_and_test(&cmd->t_fe_count))
3612 goto out_busy;
3613 }
3614
3615 if (atomic_read(&cmd->t_se_count)) {
3616 if (!atomic_dec_and_test(&cmd->t_se_count))
3617 goto out_busy;
3618 }
3619
3620 if (atomic_read(&cmd->transport_dev_active)) {
3621 atomic_set(&cmd->transport_dev_active, 0);
3622 transport_all_task_dev_remove_state(cmd);
3623 free_tasks = 1;
c66ac9db 3624 }
a1d8b49a 3625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3626
4911e3cc
CH		 3627 if (free_tasks != 0)
3628 transport_free_dev_tasks(cmd);
d3df7825 3629
c66ac9db 3630 transport_free_pages(cmd);
31afc39c 3631 transport_release_cmd(cmd);
39c05f32 3632 return;
4911e3cc
CH		 3633out_busy:
3634 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3635}
3636
c66ac9db 3637/*
ec98f782
AG		 3638 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3639 * allocating in the core.
c66ac9db
NB		 3640 * @cmd: Associated se_cmd descriptor
3641 * @mem: SGL style memory for TCM WRITE / READ
3642 * @sg_mem_num: Number of SGL elements
3643 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3644 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3645 *
3646 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3647 * of parameters.
3648 */
3649int transport_generic_map_mem_to_cmd(
3650 struct se_cmd *cmd,
5951146d
AG		 3651 struct scatterlist *sgl,
3652 u32 sgl_count,
3653 struct scatterlist *sgl_bidi,
3654 u32 sgl_bidi_count)
c66ac9db 3655{
5951146d 3656 if (!sgl || !sgl_count)
c66ac9db 3657 return 0;
c66ac9db 3658
c66ac9db
NB		 3659 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3660 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3661
ec98f782
AG		 3662 cmd->t_data_sg = sgl;
3663 cmd->t_data_nents = sgl_count;
c66ac9db 3664
ec98f782
AG		 3665 if (sgl_bidi && sgl_bidi_count) {
3666 cmd->t_bidi_data_sg = sgl_bidi;
3667 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3668 }
3669 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3670 }
3671
3672 return 0;
3673}
3674EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3675
c66ac9db
NB		 3676static int transport_new_cmd_obj(struct se_cmd *cmd)
3677{
5951146d 3678 struct se_device *dev = cmd->se_dev;
01cde4d5 3679 int set_counts = 1, rc, task_cdbs;
c66ac9db 3680
ec98f782
AG		 3681 /*
3682 * Setup any BIDI READ tasks and memory from
3683 * cmd->t_mem_bidi_list so the READ struct se_tasks
3684 * are queued first for the non pSCSI passthrough case.
3685 */
3686 if (cmd->t_bidi_data_sg &&
3687 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3688 rc = transport_allocate_tasks(cmd,
3689 cmd->t_task_lba,
3690 DMA_FROM_DEVICE,
3691 cmd->t_bidi_data_sg,
3692 cmd->t_bidi_data_nents);
6708bb27 3693 if (rc <= 0) {
c66ac9db
NB		 3694 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3695 cmd->scsi_sense_reason =
ec98f782 3696 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3697 return -EINVAL;
c66ac9db 3698 }
ec98f782
AG		 3699 atomic_inc(&cmd->t_fe_count);
3700 atomic_inc(&cmd->t_se_count);
3701 set_counts = 0;
3702 }
3703 /*
3704 * Setup the tasks and memory from cmd->t_mem_list
3705 * Note for BIDI transfers this will contain the WRITE payload
3706 */
3707 task_cdbs = transport_allocate_tasks(cmd,
3708 cmd->t_task_lba,
3709 cmd->data_direction,
3710 cmd->t_data_sg,
3711 cmd->t_data_nents);
6708bb27 3712 if (task_cdbs <= 0) {
ec98f782
AG		 3713 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3714 cmd->scsi_sense_reason =
3715 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3716 return -EINVAL;
ec98f782 3717 }
c66ac9db 3718
ec98f782
AG		 3719 if (set_counts) {
3720 atomic_inc(&cmd->t_fe_count);
3721 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 3722 }
3723
ec98f782
AG		 3724 cmd->t_task_list_num = task_cdbs;
3725
a1d8b49a
AG		 3726 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3727 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3728 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 3729 return 0;
3730}
3731
05d1c7c0
AG		 3732void *transport_kmap_first_data_page(struct se_cmd *cmd)
3733{
ec98f782 3734 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3735
ec98f782 3736 BUG_ON(!sg);
05d1c7c0 3737 /*
ec98f782
AG		 3738 * We need to take into account a possible offset here for fabrics like
3739 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3740 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3741 */
ec98f782 3742 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3743}
3744EXPORT_SYMBOL(transport_kmap_first_data_page);
3745
3746void transport_kunmap_first_data_page(struct se_cmd *cmd)
3747{
ec98f782 3748 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3749}
3750EXPORT_SYMBOL(transport_kunmap_first_data_page);
3751
c66ac9db 3752static int
05d1c7c0 3753transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3754{
ec98f782
AG		 3755 u32 length = cmd->data_length;
3756 unsigned int nents;
3757 struct page *page;
3758 int i = 0;
c66ac9db 3759
ec98f782
AG		 3760 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3761 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3762 if (!cmd->t_data_sg)
3763 return -ENOMEM;
c66ac9db 3764
ec98f782
AG		 3765 cmd->t_data_nents = nents;
3766 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3767
ec98f782
AG		 3768 while (length) {
3769 u32 page_len = min_t(u32, length, PAGE_SIZE);
3770 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3771 if (!page)
3772 goto out;
c66ac9db 3773
ec98f782
AG		 3774 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3775 length -= page_len;
3776 i++;
c66ac9db 3777 }
c66ac9db 3778 return 0;
c66ac9db 3779
ec98f782
AG		 3780out:
3781 while (i >= 0) {
3782 __free_page(sg_page(&cmd->t_data_sg[i]));
3783 i--;
c66ac9db 3784 }
ec98f782
AG		 3785 kfree(cmd->t_data_sg);
3786 cmd->t_data_sg = NULL;
3787 return -ENOMEM;
c66ac9db
NB		 3788}
3789
a1d8b49a
AG		 3790/* Reduce sectors if they are too long for the device */
3791static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3792 struct se_device *dev,
3793 unsigned long long lba,
a1d8b49a 3794 sector_t sectors)
c66ac9db 3795{
a1d8b49a 3796 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3797
a1d8b49a
AG		 3798 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3799 if ((lba + sectors) > transport_dev_end_lba(dev))
3800 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3801
a1d8b49a 3802 return sectors;
c66ac9db
NB		 3803}
3804
c66ac9db
NB		 3805
3806/*
3807 * This function can be used by HW target mode drivers to create a linked
3808 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3809 * This is intended to be called during the completion path by TCM Core
3810 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3811 */
3812void transport_do_task_sg_chain(struct se_cmd *cmd)
3813{
ec98f782
AG		 3814 struct scatterlist *sg_first = NULL;
3815 struct scatterlist *sg_prev = NULL;
3816 int sg_prev_nents = 0;
3817 struct scatterlist *sg;
c66ac9db 3818 struct se_task *task;
ec98f782 3819 u32 chained_nents = 0;
c66ac9db
NB		 3820 int i;
3821
ec98f782
AG		 3822 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3823
c66ac9db
NB		 3824 /*
3825 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3826 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3827 */
a1d8b49a 3828 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3829 if (!task->task_sg)
c66ac9db
NB		 3830 continue;
3831
ec98f782
AG		 3832 if (!sg_first) {
3833 sg_first = task->task_sg;
6708bb27 3834 chained_nents = task->task_sg_nents;
97868c89 3835 } else {
ec98f782 3836 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3837 chained_nents += task->task_sg_nents;
97868c89 3838 }
c3c74c7a
NB		 3839 /*
3840 * For the padded tasks, use the extra SGL vector allocated
3841 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3842 * offset into sg_chain() above.
3843 *
3844 * We do not need the padding for the last task (or a single
3845 * task), but in that case we will never use the sg_prev_nents
3846 * value below which would be incorrect.
c3c74c7a 3847 */
04629b7b 3848 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3849 sg_prev = task->task_sg;
c66ac9db
NB		 3850 }
3851 /*
3852 * Setup the starting pointer and total t_tasks_sg_linked_no including
3853 * padding SGs for linking and to mark the end.
3854 */
a1d8b49a 3855 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3856 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3857
6708bb27 3858 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3859 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3860 cmd->t_tasks_sg_chained_no);
c66ac9db 3861
a1d8b49a
AG		 3862 for_each_sg(cmd->t_tasks_sg_chained, sg,
3863 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3864
6708bb27 3865 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3866 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3867 if (sg_is_chain(sg))
6708bb27 3868 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3869 if (sg_is_last(sg))
6708bb27 3870 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3871 }
c66ac9db
NB		 3872}
3873EXPORT_SYMBOL(transport_do_task_sg_chain);
3874
a1d8b49a
AG		 3875/*
3876 * Break up cmd into chunks transport can handle
3877 */
ec98f782 3878static int transport_allocate_data_tasks(
c66ac9db
NB		 3879 struct se_cmd *cmd,
3880 unsigned long long lba,
c66ac9db 3881 enum dma_data_direction data_direction,
ec98f782
AG		 3882 struct scatterlist *sgl,
3883 unsigned int sgl_nents)
c66ac9db 3884{
c66ac9db 3885 struct se_task *task;
5951146d 3886 struct se_device *dev = cmd->se_dev;
ec98f782 3887 unsigned long flags;
a3eedc22 3888 int task_count, i;
277c5f27 3889 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
ec98f782
AG		 3890 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3891 struct scatterlist *sg;
3892 struct scatterlist *cmd_sg;
a1d8b49a 3893
ec98f782
AG		 3894 WARN_ON(cmd->data_length % sector_size);
3895 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27
NB		 3896 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3897
ec98f782
AG		 3898 cmd_sg = sgl;
3899 for (i = 0; i < task_count; i++) {
c3c74c7a 3900 unsigned int task_size, task_sg_nents_padded;
ec98f782 3901 int count;
a1d8b49a 3902
c66ac9db 3903 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3904 if (!task)
ec98f782 3905 return -ENOMEM;
c66ac9db 3906
c66ac9db 3907 task->task_lba = lba;
ec98f782
AG		 3908 task->task_sectors = min(sectors, dev_max_sectors);
3909 task->task_size = task->task_sectors * sector_size;
c66ac9db 3910
525a48a2
NB		 3911 /*
3912 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3913 * in order to calculate the number per task SGL entries
3914 */
3915 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3916 /*
ec98f782
AG		 3917 * Check if the fabric module driver is requesting that all
3918 * struct se_task->task_sg[] be chained together.. If so,
3919 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3920 * marking the end of the chained SGL for every task except
3921 * the last one for (task_count > 1) operation, or skipping
3922 * the extra padding for the (task_count == 1) case.
c66ac9db 3923 */
c3c74c7a
NB		 3924 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3925 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3926 } else
3927 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3928
1d20bb61 3929 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3930 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3931 if (!task->task_sg) {
3932 cmd->se_dev->transport->free_task(task);
3933 return -ENOMEM;
3934 }
3935
c3c74c7a 3936 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3937
ec98f782
AG		 3938 task_size = task->task_size;
3939
3940 /* Build new sgl, only up to task_size */
6708bb27 3941 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3942 if (cmd_sg->length > task_size)
3943 break;
3944
3945 *sg = *cmd_sg;
3946 task_size -= cmd_sg->length;
3947 cmd_sg = sg_next(cmd_sg);
c66ac9db 3948 }
c66ac9db 3949
ec98f782
AG		 3950 lba += task->task_sectors;
3951 sectors -= task->task_sectors;
c66ac9db 3952
ec98f782
AG		 3953 spin_lock_irqsave(&cmd->t_state_lock, flags);
3954 list_add_tail(&task->t_list, &cmd->t_task_list);
3955 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3956 }
3957
ec98f782 3958 return task_count;
c66ac9db
NB		 3959}
3960
3961static int
ec98f782 3962transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3963{
c66ac9db 3964 struct se_task *task;
ec98f782 3965 unsigned long flags;
c66ac9db
NB		 3966
3967 task = transport_generic_get_task(cmd, cmd->data_direction);
3968 if (!task)
ec98f782 3969 return -ENOMEM;
c66ac9db 3970
ec98f782
AG		 3971 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
3972 GFP_KERNEL);
3973 if (!task->task_sg) {
3974 cmd->se_dev->transport->free_task(task);
3975 return -ENOMEM;
3976 }
3977
3978 memcpy(task->task_sg, cmd->t_data_sg,
3979 sizeof(struct scatterlist) * cmd->t_data_nents);
c66ac9db 3980 task->task_size = cmd->data_length;
6708bb27 3981 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3982
ec98f782
AG		 3983 spin_lock_irqsave(&cmd->t_state_lock, flags);
3984 list_add_tail(&task->t_list, &cmd->t_task_list);
3985 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3986
6708bb27 3987 /* Success! Return number of tasks allocated */
a3eedc22 3988 return 1;
ec98f782
AG		 3989}
3990
3991static u32 transport_allocate_tasks(
3992 struct se_cmd *cmd,
3993 unsigned long long lba,
3994 enum dma_data_direction data_direction,
3995 struct scatterlist *sgl,
3996 unsigned int sgl_nents)
3997{
01cde4d5
NB		 3998 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3999 if (transport_cmd_get_valid_sectors(cmd) < 0)
4000 return -EINVAL;
4001
ec98f782
AG		 4002 return transport_allocate_data_tasks(cmd, lba, data_direction,
4003 sgl, sgl_nents);
01cde4d5 4004 } else
6708bb27
AG		 4005 return transport_allocate_control_task(cmd);
4006
c66ac9db
NB		 4007}
4008
ec98f782 4009
c66ac9db
NB		 4010/* transport_generic_new_cmd(): Called from transport_processing_thread()
4011 *
4012 * Allocate storage transport resources from a set of values predefined
4013 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4014 * Any non zero return here is treated as an "out of resource' op here.
4015 */
4016 /*
4017 * Generate struct se_task(s) and/or their payloads for this CDB.
4018 */
a1d8b49a 4019int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4020{
c66ac9db
NB		 4021 int ret = 0;
4022
4023 /*
4024 * Determine is the TCM fabric module has already allocated physical
4025 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 4026 * beforehand.
c66ac9db 4027 */
ec98f782
AG		 4028 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4029 cmd->data_length) {
05d1c7c0 4030 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4031 if (ret < 0)
4032 return ret;
4033 }
1d20bb61
NB		 4034 /*
4035 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4036 * control or data CDB types, and perform the map to backend subsystem
4037 * code from SGL memory allocated here by transport_generic_get_mem(), or
4038 * via pre-existing SGL memory setup explictly by fabric module code with
4039 * transport_generic_map_mem_to_cmd().
4040 */
c66ac9db
NB		 4041 ret = transport_new_cmd_obj(cmd);
4042 if (ret < 0)
4043 return ret;
c66ac9db 4044 /*
a1d8b49a 4045 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4046 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4047 * will be added to the struct se_device execution queue after its WRITE
4048 * data has arrived. (ie: It gets handled by the transport processing
4049 * thread a second time)
4050 */
4051 if (cmd->data_direction == DMA_TO_DEVICE) {
4052 transport_add_tasks_to_state_queue(cmd);
4053 return transport_generic_write_pending(cmd);
4054 }
4055 /*
4056 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4057 * to the execution queue.
4058 */
4059 transport_execute_tasks(cmd);
4060 return 0;
4061}
a1d8b49a 4062EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4063
4064/* transport_generic_process_write():
4065 *
4066 *
4067 */
4068void transport_generic_process_write(struct se_cmd *cmd)
4069{
c66ac9db
NB		 4070 transport_execute_tasks(cmd);
4071}
4072EXPORT_SYMBOL(transport_generic_process_write);
4073
e057f533 4074static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 4075{
e057f533
CH		 4076 if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
4077 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4078 cmd);
4079 transport_handle_queue_full(cmd, cmd->se_dev);
4080 }
07bde79a
NB		 4081}
4082
c66ac9db
NB		 4083static int transport_generic_write_pending(struct se_cmd *cmd)
4084{
4085 unsigned long flags;
4086 int ret;
4087
a1d8b49a 4088 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4089 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4090 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 4091
c66ac9db
NB		 4092 /*
4093 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4094 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4095 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4096 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4097 * because the se_cmd->se_lun pointer is not being cleared.
4098 */
4099 transport_cmd_check_stop(cmd, 1, 0);
4100
4101 /*
4102 * Call the fabric write_pending function here to let the
4103 * frontend know that WRITE buffers are ready.
4104 */
e3d6f909 4105 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 4106 if (ret == -EAGAIN)
4107 goto queue_full;
4108 else if (ret < 0)
c66ac9db
NB		 4109 return ret;
4110
4111 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 4112
4113queue_full:
6708bb27 4114 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 4115 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 4116 transport_handle_queue_full(cmd, cmd->se_dev);
07bde79a 4117 return ret;
c66ac9db
NB		 4118}
4119
2dbc43d2
CH		 4120/**
4121 * transport_release_cmd - free a command
4122 * @cmd: command to free
4123 *
4124 * This routine unconditionally frees a command, and reference counting
4125 * or list removal must be done in the caller.
4126 */
35462975 4127void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4128{
e3d6f909 4129 BUG_ON(!cmd->se_tfo);
c66ac9db 4130
2dbc43d2
CH		 4131 if (cmd->se_tmr_req)
4132 core_tmr_release_req(cmd->se_tmr_req);
4133 if (cmd->t_task_cdb != cmd->__t_task_cdb)
4134 kfree(cmd->t_task_cdb);
35462975 4135 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4136}
35462975 4137EXPORT_SYMBOL(transport_release_cmd);
c66ac9db 4138
39c05f32 4139void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 4140{
d14921d6
NB		 4141 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
4142 if (wait_for_tasks && cmd->se_tmr_req)
4143 transport_wait_for_tasks(cmd);
4144
35462975 4145 transport_release_cmd(cmd);
d14921d6
NB		 4146 } else {
4147 if (wait_for_tasks)
4148 transport_wait_for_tasks(cmd);
4149
c66ac9db
NB		 4150 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4151
82f1c8a4 4152 if (cmd->se_lun)
c66ac9db 4153 transport_lun_remove_cmd(cmd);
c66ac9db 4154
f4366772
NB		 4155 transport_free_dev_tasks(cmd);
4156
39c05f32 4157 transport_put_cmd(cmd);
c66ac9db
NB		 4158 }
4159}
4160EXPORT_SYMBOL(transport_generic_free_cmd);
4161
c66ac9db
NB		 4162/* transport_lun_wait_for_tasks():
4163 *
4164 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4165 * an struct se_lun to be successfully shutdown.
4166 */
4167static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4168{
4169 unsigned long flags;
4170 int ret;
4171 /*
4172 * If the frontend has already requested this struct se_cmd to
4173 * be stopped, we can safely ignore this struct se_cmd.
4174 */
a1d8b49a
AG		 4175 spin_lock_irqsave(&cmd->t_state_lock, flags);
4176 if (atomic_read(&cmd->t_transport_stop)) {
4177 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4178 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4179 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4180 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4181 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4182 return -EPERM;
c66ac9db 4183 }
a1d8b49a
AG		 4184 atomic_set(&cmd->transport_lun_fe_stop, 1);
4185 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4186
5951146d 4187 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4188
4189 ret = transport_stop_tasks_for_cmd(cmd);
4190
6708bb27
AG		 4191 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4192 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4193 if (!ret) {
6708bb27 4194 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4195 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4196 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4197 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4198 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4199 }
3df8d40b 4200 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4201
4202 return 0;
4203}
4204
c66ac9db
NB		 4205static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4206{
4207 struct se_cmd *cmd = NULL;
4208 unsigned long lun_flags, cmd_flags;
4209 /*
4210 * Do exception processing and return CHECK_CONDITION status to the
4211 * Initiator Port.
4212 */
4213 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4214 while (!list_empty(&lun->lun_cmd_list)) {
4215 cmd = list_first_entry(&lun->lun_cmd_list,
4216 struct se_cmd, se_lun_node);
4217 list_del(&cmd->se_lun_node);
4218
a1d8b49a 4219 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4220 /*
4221 * This will notify iscsi_target_transport.c:
4222 * transport_cmd_check_stop() that a LUN shutdown is in
4223 * progress for the iscsi_cmd_t.
4224 */
a1d8b49a 4225 spin_lock(&cmd->t_state_lock);
6708bb27 4226 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4227 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4228 cmd->se_lun->unpacked_lun,
4229 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4230 atomic_set(&cmd->transport_lun_stop, 1);
4231 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4232
4233 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4234
6708bb27
AG		 4235 if (!cmd->se_lun) {
4236 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4237 cmd->se_tfo->get_task_tag(cmd),
4238 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4239 BUG();
4240 }
4241 /*
4242 * If the Storage engine still owns the iscsi_cmd_t, determine
4243 * and/or stop its context.
4244 */
6708bb27 4245 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4246 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4247 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4248
e3d6f909 4249 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4250 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4251 continue;
4252 }
4253
6708bb27 4254 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4255 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4256 cmd->se_lun->unpacked_lun,
4257 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4258
a1d8b49a 4259 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4260 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4261 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4262 goto check_cond;
4263 }
a1d8b49a 4264 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4265 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4266 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4267
4268 transport_free_dev_tasks(cmd);
4269 /*
4270 * The Storage engine stopped this struct se_cmd before it was
4271 * send to the fabric frontend for delivery back to the
4272 * Initiator Node. Return this SCSI CDB back with an
4273 * CHECK_CONDITION status.
4274 */
4275check_cond:
4276 transport_send_check_condition_and_sense(cmd,
4277 TCM_NON_EXISTENT_LUN, 0);
4278 /*
4279 * If the fabric frontend is waiting for this iscsi_cmd_t to
4280 * be released, notify the waiting thread now that LU has
4281 * finished accessing it.
4282 */
a1d8b49a
AG		 4283 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4284 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4285 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4286 " struct se_cmd: %p ITT: 0x%08x\n",
4287 lun->unpacked_lun,
e3d6f909 4288 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4289
a1d8b49a 4290 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4291 cmd_flags);
4292 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4293 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4294 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4295 continue;
4296 }
6708bb27 4297 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4298 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4299
a1d8b49a 4300 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4301 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4302 }
4303 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4304}
4305
4306static int transport_clear_lun_thread(void *p)
4307{
4308 struct se_lun *lun = (struct se_lun *)p;
4309
4310 __transport_clear_lun_from_sessions(lun);
4311 complete(&lun->lun_shutdown_comp);
4312
4313 return 0;
4314}
4315
4316int transport_clear_lun_from_sessions(struct se_lun *lun)
4317{
4318 struct task_struct *kt;
4319
5951146d 4320 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4321 "tcm_cl_%u", lun->unpacked_lun);
4322 if (IS_ERR(kt)) {
6708bb27 4323 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4324 return PTR_ERR(kt);
c66ac9db
NB		 4325 }
4326 wait_for_completion(&lun->lun_shutdown_comp);
4327
4328 return 0;
4329}
4330
d14921d6
NB		 4331/**
4332 * transport_wait_for_tasks - wait for completion to occur
4333 * @cmd: command to wait
c66ac9db 4334 *
d14921d6
NB		 4335 * Called from frontend fabric context to wait for storage engine
4336 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4337 */
d14921d6 4338void transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4339{
4340 unsigned long flags;
4341
a1d8b49a 4342 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4343 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4344 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4345 return;
4346 }
4347 /*
4348 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4349 * has been set in transport_set_supported_SAM_opcode().
4350 */
4351 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4352 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4353 return;
4354 }
c66ac9db
NB		 4355 /*
4356 * If we are already stopped due to an external event (ie: LUN shutdown)
4357 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4358 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4359 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4360 * has completed its operation on the struct se_cmd.
4361 */
a1d8b49a 4362 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4363
6708bb27 4364 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4365 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4366 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4367 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4368 /*
4369 * There is a special case for WRITES where a FE exception +
4370 * LUN shutdown means ConfigFS context is still sleeping on
4371 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4372 * We go ahead and up transport_lun_stop_comp just to be sure
4373 * here.
4374 */
a1d8b49a
AG		 4375 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4376 complete(&cmd->transport_lun_stop_comp);
4377 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4378 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4379
4380 transport_all_task_dev_remove_state(cmd);
4381 /*
4382 * At this point, the frontend who was the originator of this
4383 * struct se_cmd, now owns the structure and can be released through
4384 * normal means below.
4385 */
6708bb27 4386 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4387 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4388 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4389 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4390
a1d8b49a 4391 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4392 }
a1d8b49a 4393 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4394 atomic_read(&cmd->t_transport_aborted)) {
4395 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4396 return;
4397 }
c66ac9db 4398
a1d8b49a 4399 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4400
6708bb27 4401 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
f2da9dbd
CH		 4402 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4403 cmd, cmd->se_tfo->get_task_tag(cmd),
4404 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4405
a1d8b49a 4406 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4407
5951146d 4408 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4409
a1d8b49a 4410 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4411
a1d8b49a
AG		 4412 spin_lock_irqsave(&cmd->t_state_lock, flags);
4413 atomic_set(&cmd->t_transport_active, 0);
4414 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4415
6708bb27 4416 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4417 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4418 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4419
d14921d6 4420 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4421}
d14921d6 4422EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4423
4424static int transport_get_sense_codes(
4425 struct se_cmd *cmd,
4426 u8 *asc,
4427 u8 *ascq)
4428{
4429 *asc = cmd->scsi_asc;
4430 *ascq = cmd->scsi_ascq;
4431
4432 return 0;
4433}
4434
4435static int transport_set_sense_codes(
4436 struct se_cmd *cmd,
4437 u8 asc,
4438 u8 ascq)
4439{
4440 cmd->scsi_asc = asc;
4441 cmd->scsi_ascq = ascq;
4442
4443 return 0;
4444}
4445
4446int transport_send_check_condition_and_sense(
4447 struct se_cmd *cmd,
4448 u8 reason,
4449 int from_transport)
4450{
4451 unsigned char *buffer = cmd->sense_buffer;
4452 unsigned long flags;
4453 int offset;
4454 u8 asc = 0, ascq = 0;
4455
a1d8b49a 4456 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4457 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4458 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4459 return 0;
4460 }
4461 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4462 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4463
4464 if (!reason && from_transport)
4465 goto after_reason;
4466
4467 if (!from_transport)
4468 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4469 /*
4470 * Data Segment and SenseLength of the fabric response PDU.
4471 *
4472 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4473 * from include/scsi/scsi_cmnd.h
4474 */
e3d6f909 4475 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4476 TRANSPORT_SENSE_BUFFER);
4477 /*
4478 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4479 * SENSE KEY values from include/scsi/scsi.h
4480 */
4481 switch (reason) {
4482 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4483 /* CURRENT ERROR */
4484 buffer[offset] = 0x70;
4485 /* ILLEGAL REQUEST */
4486 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4487 /* LOGICAL UNIT NOT SUPPORTED */
4488 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4489 break;
c66ac9db
NB		 4490 case TCM_UNSUPPORTED_SCSI_OPCODE:
4491 case TCM_SECTOR_COUNT_TOO_MANY:
4492 /* CURRENT ERROR */
4493 buffer[offset] = 0x70;
4494 /* ILLEGAL REQUEST */
4495 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4496 /* INVALID COMMAND OPERATION CODE */
4497 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4498 break;
4499 case TCM_UNKNOWN_MODE_PAGE:
4500 /* CURRENT ERROR */
4501 buffer[offset] = 0x70;
4502 /* ILLEGAL REQUEST */
4503 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4504 /* INVALID FIELD IN CDB */
4505 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4506 break;
4507 case TCM_CHECK_CONDITION_ABORT_CMD:
4508 /* CURRENT ERROR */
4509 buffer[offset] = 0x70;
4510 /* ABORTED COMMAND */
4511 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4512 /* BUS DEVICE RESET FUNCTION OCCURRED */
4513 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4514 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4515 break;
4516 case TCM_INCORRECT_AMOUNT_OF_DATA:
4517 /* CURRENT ERROR */
4518 buffer[offset] = 0x70;
4519 /* ABORTED COMMAND */
4520 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4521 /* WRITE ERROR */
4522 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4523 /* NOT ENOUGH UNSOLICITED DATA */
4524 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4525 break;
4526 case TCM_INVALID_CDB_FIELD:
4527 /* CURRENT ERROR */
4528 buffer[offset] = 0x70;
4529 /* ABORTED COMMAND */
4530 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4531 /* INVALID FIELD IN CDB */
4532 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4533 break;
4534 case TCM_INVALID_PARAMETER_LIST:
4535 /* CURRENT ERROR */
4536 buffer[offset] = 0x70;
4537 /* ABORTED COMMAND */
4538 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4539 /* INVALID FIELD IN PARAMETER LIST */
4540 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4541 break;
4542 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4543 /* CURRENT ERROR */
4544 buffer[offset] = 0x70;
4545 /* ABORTED COMMAND */
4546 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4547 /* WRITE ERROR */
4548 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4549 /* UNEXPECTED_UNSOLICITED_DATA */
4550 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4551 break;
4552 case TCM_SERVICE_CRC_ERROR:
4553 /* CURRENT ERROR */
4554 buffer[offset] = 0x70;
4555 /* ABORTED COMMAND */
4556 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4557 /* PROTOCOL SERVICE CRC ERROR */
4558 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4559 /* N/A */
4560 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4561 break;
4562 case TCM_SNACK_REJECTED:
4563 /* CURRENT ERROR */
4564 buffer[offset] = 0x70;
4565 /* ABORTED COMMAND */
4566 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4567 /* READ ERROR */
4568 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4569 /* FAILED RETRANSMISSION REQUEST */
4570 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4571 break;
4572 case TCM_WRITE_PROTECTED:
4573 /* CURRENT ERROR */
4574 buffer[offset] = 0x70;
4575 /* DATA PROTECT */
4576 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4577 /* WRITE PROTECTED */
4578 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4579 break;
4580 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4581 /* CURRENT ERROR */
4582 buffer[offset] = 0x70;
4583 /* UNIT ATTENTION */
4584 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4585 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4586 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4587 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4588 break;
4589 case TCM_CHECK_CONDITION_NOT_READY:
4590 /* CURRENT ERROR */
4591 buffer[offset] = 0x70;
4592 /* Not Ready */
4593 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4594 transport_get_sense_codes(cmd, &asc, &ascq);
4595 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4596 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4597 break;
4598 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4599 default:
4600 /* CURRENT ERROR */
4601 buffer[offset] = 0x70;
4602 /* ILLEGAL REQUEST */
4603 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4604 /* LOGICAL UNIT COMMUNICATION FAILURE */
4605 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4606 break;
4607 }
4608 /*
4609 * This code uses linux/include/scsi/scsi.h SAM status codes!
4610 */
4611 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4612 /*
4613 * Automatically padded, this value is encoded in the fabric's
4614 * data_length response PDU containing the SCSI defined sense data.
4615 */
4616 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4617
4618after_reason:
07bde79a 4619 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4620}
4621EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4622
4623int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4624{
4625 int ret = 0;
4626
a1d8b49a 4627 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4628 if (!send_status ||
c66ac9db
NB		 4629 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4630 return 1;
4631#if 0
6708bb27 4632 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4633 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4634 cmd->t_task_cdb[0],
e3d6f909 4635 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4636#endif
4637 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4638 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4639 ret = 1;
4640 }
4641 return ret;
4642}
4643EXPORT_SYMBOL(transport_check_aborted_status);
4644
4645void transport_send_task_abort(struct se_cmd *cmd)
4646{
c252f003
NB		 4647 unsigned long flags;
4648
4649 spin_lock_irqsave(&cmd->t_state_lock, flags);
4650 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4651 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4652 return;
4653 }
4654 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4655
c66ac9db
NB		 4656 /*
4657 * If there are still expected incoming fabric WRITEs, we wait
4658 * until until they have completed before sending a TASK_ABORTED
4659 * response. This response with TASK_ABORTED status will be
4660 * queued back to fabric module by transport_check_aborted_status().
4661 */
4662 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4663 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4664 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4665 smp_mb__after_atomic_inc();
4666 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4667 transport_new_cmd_failure(cmd);
4668 return;
4669 }
4670 }
4671 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4672#if 0
6708bb27 4673 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4674 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4675 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4676#endif
e3d6f909 4677 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4678}
4679
4680/* transport_generic_do_tmr():
4681 *
4682 *
4683 */
4684int transport_generic_do_tmr(struct se_cmd *cmd)
4685{
5951146d 4686 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4687 struct se_tmr_req *tmr = cmd->se_tmr_req;
4688 int ret;
4689
4690 switch (tmr->function) {
5c6cd613 4691 case TMR_ABORT_TASK:
c66ac9db
NB		 4692 tmr->response = TMR_FUNCTION_REJECTED;
4693 break;
5c6cd613
NB		 4694 case TMR_ABORT_TASK_SET:
4695 case TMR_CLEAR_ACA:
4696 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4697 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4698 break;
5c6cd613 4699 case TMR_LUN_RESET:
c66ac9db
NB		 4700 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4701 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4702 TMR_FUNCTION_REJECTED;
4703 break;
5c6cd613 4704 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4705 tmr->response = TMR_FUNCTION_REJECTED;
4706 break;
5c6cd613 4707 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4708 tmr->response = TMR_FUNCTION_REJECTED;
4709 break;
c66ac9db 4710 default:
6708bb27 4711 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4712 tmr->function);
4713 tmr->response = TMR_FUNCTION_REJECTED;
4714 break;
4715 }
4716
4717 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4718 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4719
b7b8bef7 4720 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4721 return 0;
4722}
4723
c66ac9db
NB		 4724/* transport_processing_thread():
4725 *
4726 *
4727 */
4728static int transport_processing_thread(void *param)
4729{
5951146d 4730 int ret;
c66ac9db
NB		 4731 struct se_cmd *cmd;
4732 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 4733
4734 set_user_nice(current, -20);
4735
4736 while (!kthread_should_stop()) {
e3d6f909
AG		 4737 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4738 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4739 kthread_should_stop());
4740 if (ret < 0)
4741 goto out;
4742
c66ac9db
NB		 4743get_cmd:
4744 __transport_execute_tasks(dev);
4745
5951146d
AG		 4746 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4747 if (!cmd)
c66ac9db
NB		 4748 continue;
4749
5951146d 4750 switch (cmd->t_state) {
680b73c5
CH		 4751 case TRANSPORT_NEW_CMD:
4752 BUG();
4753 break;
c66ac9db 4754 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4755 if (!cmd->se_tfo->new_cmd_map) {
4756 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4757 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4758 BUG();
4759 }
e3d6f909 4760 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 4761 if (ret < 0) {
4762 cmd->transport_error_status = ret;
4499dda8 4763 transport_generic_request_failure(cmd,
c66ac9db
NB		 4764 0, (cmd->data_direction !=
4765 DMA_TO_DEVICE));
4766 break;
4767 }
c66ac9db 4768 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 4769 if (ret == -EAGAIN)
4770 break;
4771 else if (ret < 0) {
c66ac9db 4772 cmd->transport_error_status = ret;
4499dda8 4773 transport_generic_request_failure(cmd,
c66ac9db
NB		 4774 0, (cmd->data_direction !=
4775 DMA_TO_DEVICE));
4776 }
4777 break;
4778 case TRANSPORT_PROCESS_WRITE:
4779 transport_generic_process_write(cmd);
4780 break;
4781 case TRANSPORT_COMPLETE_OK:
c66ac9db
NB		 4782 transport_generic_complete_ok(cmd);
4783 break;
f4366772 4784 case TRANSPORT_FREE_CMD_INTR:
82f1c8a4 4785 transport_generic_free_cmd(cmd, 0);
f4366772 4786 break;
c66ac9db
NB		 4787 case TRANSPORT_PROCESS_TMR:
4788 transport_generic_do_tmr(cmd);
4789 break;
4790 case TRANSPORT_COMPLETE_FAILURE:
4499dda8 4791 transport_generic_request_failure(cmd, 1, 1);
c66ac9db
NB		 4792 break;
4793 case TRANSPORT_COMPLETE_TIMEOUT:
c66ac9db
NB		 4794 transport_generic_request_timeout(cmd);
4795 break;
07bde79a 4796 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4797 transport_write_pending_qf(cmd);
4798 break;
4799 case TRANSPORT_COMPLETE_QF_OK:
4800 transport_complete_qf(cmd);
07bde79a 4801 break;
c66ac9db 4802 default:
f2da9dbd
CH		 4803 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4804 "i_state: %d on SE LUN: %u\n",
4805 cmd->t_state,
e3d6f909
AG		 4806 cmd->se_tfo->get_task_tag(cmd),
4807 cmd->se_tfo->get_cmd_state(cmd),
4808 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4809 BUG();
4810 }
4811
4812 goto get_cmd;
4813 }
4814
4815out:
ce8762f6
NB		 4816 WARN_ON(!list_empty(&dev->state_task_list));
4817 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4818 dev->process_thread = NULL;
4819 return 0;
4820}