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target: move depth_left manipulation out of transport_generic_request_failure
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
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
NB		 480
481 cmd->deferred_t_state = cmd->t_state;
482 cmd->t_state = TRANSPORT_DEFERRED_CMD;
a1d8b49a 483 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 484 if (transport_off == 2)
485 transport_all_task_dev_remove_state(cmd);
a1d8b49a 486 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 487
a1d8b49a 488 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 489 return 1;
490 }
491 /*
492 * Determine if frontend context caller is requesting the stopping of
e3d6f909 493 * this command for frontend exceptions.
c66ac9db 494 */
a1d8b49a 495 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 496 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 497 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 498 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 499
500 cmd->deferred_t_state = cmd->t_state;
501 cmd->t_state = TRANSPORT_DEFERRED_CMD;
502 if (transport_off == 2)
503 transport_all_task_dev_remove_state(cmd);
504
505 /*
506 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
507 * to FE.
508 */
509 if (transport_off == 2)
510 cmd->se_lun = NULL;
a1d8b49a 511 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 512
a1d8b49a 513 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 514 return 1;
515 }
516 if (transport_off) {
a1d8b49a 517 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 518 if (transport_off == 2) {
519 transport_all_task_dev_remove_state(cmd);
520 /*
521 * Clear struct se_cmd->se_lun before the transport_off == 2
522 * handoff to fabric module.
523 */
524 cmd->se_lun = NULL;
525 /*
526 * Some fabric modules like tcm_loop can release
25985edc 527 * their internally allocated I/O reference now and
c66ac9db
NB		 528 * struct se_cmd now.
529 */
e3d6f909 530 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 531 spin_unlock_irqrestore(
a1d8b49a 532 &cmd->t_state_lock, flags);
c66ac9db 533
e3d6f909 534 cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 535 return 1;
536 }
537 }
a1d8b49a 538 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 539
540 return 0;
541 } else if (t_state)
542 cmd->t_state = t_state;
a1d8b49a 543 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 544
545 return 0;
546}
547
548static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
549{
550 return transport_cmd_check_stop(cmd, 2, 0);
551}
552
553static void transport_lun_remove_cmd(struct se_cmd *cmd)
554{
e3d6f909 555 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 556 unsigned long flags;
557
558 if (!lun)
559 return;
560
a1d8b49a 561 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 562 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 563 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 564 goto check_lun;
565 }
a1d8b49a 566 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 567 transport_all_task_dev_remove_state(cmd);
a1d8b49a 568 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 569
c66ac9db
NB		 570
571check_lun:
572 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 573 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 574 list_del(&cmd->se_lun_node);
a1d8b49a 575 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 576#if 0
6708bb27 577 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 578 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 579#endif
580 }
581 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
582}
583
584void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
585{
8dc52b54
NB		 586 if (!cmd->se_tmr_req)
587 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 588
589 if (transport_cmd_check_stop_to_fabric(cmd))
590 return;
77039d1e 591 if (remove) {
3df8d40b 592 transport_remove_cmd_from_queue(cmd);
e6a2573f 593 transport_put_cmd(cmd);
77039d1e 594 }
c66ac9db
NB		 595}
596
f7a5cc0b
CH		 597static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
598 bool at_head)
c66ac9db
NB		 599{
600 struct se_device *dev = cmd->se_dev;
e3d6f909 601 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 602 unsigned long flags;
603
c66ac9db 604 if (t_state) {
a1d8b49a 605 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 606 cmd->t_state = t_state;
a1d8b49a
AG		 607 atomic_set(&cmd->t_transport_active, 1);
608 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 609 }
610
611 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 612
613 /* If the cmd is already on the list, remove it before we add it */
614 if (!list_empty(&cmd->se_queue_node))
615 list_del(&cmd->se_queue_node);
616 else
617 atomic_inc(&qobj->queue_cnt);
618
f7a5cc0b 619 if (at_head)
07bde79a 620 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 621 else
07bde79a 622 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 623 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 624 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
625
c66ac9db 626 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 627}
628
5951146d
AG		 629static struct se_cmd *
630transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 631{
5951146d 632 struct se_cmd *cmd;
c66ac9db
NB		 633 unsigned long flags;
634
635 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
636 if (list_empty(&qobj->qobj_list)) {
637 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
638 return NULL;
639 }
5951146d 640 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 641
79a7fef2 642 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 643
79a7fef2 644 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 645 atomic_dec(&qobj->queue_cnt);
646 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
647
5951146d 648 return cmd;
c66ac9db
NB		 649}
650
3df8d40b 651static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 652{
3df8d40b 653 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 654 unsigned long flags;
655
656 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 657 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 658 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
659 return;
660 }
79a7fef2
RD		 661 atomic_set(&cmd->t_transport_queue_active, 0);
662 atomic_dec(&qobj->queue_cnt);
663 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 664 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
665
a1d8b49a 666 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 667 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 668 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 669 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 670 }
671}
672
673/*
674 * Completion function used by TCM subsystem plugins (such as FILEIO)
675 * for queueing up response from struct se_subsystem_api->do_task()
676 */
677void transport_complete_sync_cache(struct se_cmd *cmd, int good)
678{
a1d8b49a 679 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 680 struct se_task, t_list);
681
682 if (good) {
683 cmd->scsi_status = SAM_STAT_GOOD;
684 task->task_scsi_status = GOOD;
685 } else {
686 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
687 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 688 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 689 PYX_TRANSPORT_ILLEGAL_REQUEST;
690 }
691
692 transport_complete_task(task, good);
693}
694EXPORT_SYMBOL(transport_complete_sync_cache);
695
696/* transport_complete_task():
697 *
698 * Called from interrupt and non interrupt context depending
699 * on the transport plugin.
700 */
701void transport_complete_task(struct se_task *task, int success)
702{
e3d6f909 703 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 704 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 705 int t_state;
706 unsigned long flags;
707#if 0
6708bb27 708 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 709 cmd->t_task_cdb[0], dev);
c66ac9db 710#endif
e3d6f909 711 if (dev)
c66ac9db 712 atomic_inc(&dev->depth_left);
c66ac9db 713
cc5d0f0f
CH		 714 del_timer(&task->task_timer);
715
a1d8b49a 716 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 717 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 718
719 /*
720 * See if any sense data exists, if so set the TASK_SENSE flag.
721 * Also check for any other post completion work that needs to be
722 * done by the plugins.
723 */
724 if (dev && dev->transport->transport_complete) {
725 if (dev->transport->transport_complete(task) != 0) {
726 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
727 task->task_sense = 1;
728 success = 1;
729 }
730 }
731
732 /*
733 * See if we are waiting for outstanding struct se_task
734 * to complete for an exception condition
735 */
6c76bf95 736 if (task->task_flags & TF_REQUEST_STOP) {
c66ac9db 737 /*
a1d8b49a 738 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 739 * previously thrown its timeout exception handler.
740 */
6c76bf95 741 if (task->task_flags & TF_TIMEOUT) {
a1d8b49a 742 atomic_dec(&cmd->t_se_count);
6c76bf95 743 task->task_flags &= ~TF_TIMEOUT;
c66ac9db 744 }
a1d8b49a 745 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 746
747 complete(&task->task_stop_comp);
748 return;
749 }
750 /*
751 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
752 * left counter to determine when the struct se_cmd is ready to be queued to
753 * the processing thread.
754 */
6c76bf95 755 if (task->task_flags & TF_TIMEOUT) {
6708bb27
AG		 756 if (!atomic_dec_and_test(
757 &cmd->t_task_cdbs_timeout_left)) {
a1d8b49a 758 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 759 flags);
760 return;
761 }
762 t_state = TRANSPORT_COMPLETE_TIMEOUT;
a1d8b49a 763 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 764
f7a5cc0b 765 transport_add_cmd_to_queue(cmd, t_state, false);
c66ac9db
NB		 766 return;
767 }
a1d8b49a 768 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 769
770 /*
771 * Decrement the outstanding t_task_cdbs_left count. The last
772 * struct se_task from struct se_cmd will complete itself into the
773 * device queue depending upon int success.
774 */
6708bb27 775 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
c66ac9db 776 if (!success)
a1d8b49a 777 cmd->t_tasks_failed = 1;
c66ac9db 778
a1d8b49a 779 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 780 return;
781 }
782
a1d8b49a 783 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 784 t_state = TRANSPORT_COMPLETE_FAILURE;
785 if (!task->task_error_status) {
786 task->task_error_status =
787 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
788 cmd->transport_error_status =
789 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
790 }
791 } else {
a1d8b49a 792 atomic_set(&cmd->t_transport_complete, 1);
c66ac9db
NB		 793 t_state = TRANSPORT_COMPLETE_OK;
794 }
a1d8b49a 795 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 796
f7a5cc0b 797 transport_add_cmd_to_queue(cmd, t_state, false);
c66ac9db
NB		 798}
799EXPORT_SYMBOL(transport_complete_task);
800
801/*
802 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
803 * struct se_task list are ready to be added to the active execution list
804 * struct se_device
805
806 * Called with se_dev_t->execute_task_lock called.
807 */
808static inline int transport_add_task_check_sam_attr(
809 struct se_task *task,
810 struct se_task *task_prev,
811 struct se_device *dev)
812{
813 /*
814 * No SAM Task attribute emulation enabled, add to tail of
815 * execution queue
816 */
817 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
818 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
819 return 0;
820 }
821 /*
822 * HEAD_OF_QUEUE attribute for received CDB, which means
823 * the first task that is associated with a struct se_cmd goes to
824 * head of the struct se_device->execute_task_list, and task_prev
825 * after that for each subsequent task
826 */
e66ecd50 827 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 828 list_add(&task->t_execute_list,
829 (task_prev != NULL) ?
830 &task_prev->t_execute_list :
831 &dev->execute_task_list);
832
6708bb27 833 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 834 " in execution queue\n",
6708bb27 835 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 836 return 1;
837 }
838 /*
839 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
840 * transitioned from Dermant -> Active state, and are added to the end
841 * of the struct se_device->execute_task_list
842 */
843 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
844 return 0;
845}
846
847/* __transport_add_task_to_execute_queue():
848 *
849 * Called with se_dev_t->execute_task_lock called.
850 */
851static void __transport_add_task_to_execute_queue(
852 struct se_task *task,
853 struct se_task *task_prev,
854 struct se_device *dev)
855{
856 int head_of_queue;
857
858 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
859 atomic_inc(&dev->execute_tasks);
860
861 if (atomic_read(&task->task_state_active))
862 return;
863 /*
864 * Determine if this task needs to go to HEAD_OF_QUEUE for the
865 * state list as well. Running with SAM Task Attribute emulation
866 * will always return head_of_queue == 0 here
867 */
868 if (head_of_queue)
869 list_add(&task->t_state_list, (task_prev) ?
870 &task_prev->t_state_list :
871 &dev->state_task_list);
872 else
873 list_add_tail(&task->t_state_list, &dev->state_task_list);
874
875 atomic_set(&task->task_state_active, 1);
876
6708bb27 877 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 878 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 879 task, dev);
880}
881
882static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
883{
42bf829e 884 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 885 struct se_task *task;
886 unsigned long flags;
887
a1d8b49a
AG		 888 spin_lock_irqsave(&cmd->t_state_lock, flags);
889 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 890 if (atomic_read(&task->task_state_active))
891 continue;
892
893 spin_lock(&dev->execute_task_lock);
894 list_add_tail(&task->t_state_list, &dev->state_task_list);
895 atomic_set(&task->task_state_active, 1);
896
6708bb27
AG		 897 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
898 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 899 task->task_se_cmd), task, dev);
900
901 spin_unlock(&dev->execute_task_lock);
902 }
a1d8b49a 903 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 904}
905
906static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
907{
5951146d 908 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 909 struct se_task *task, *task_prev = NULL;
910 unsigned long flags;
911
912 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 913 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 914 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 915 continue;
916 /*
917 * __transport_add_task_to_execute_queue() handles the
918 * SAM Task Attribute emulation if enabled
919 */
920 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 921 task_prev = task;
922 }
923 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 924}
925
04629b7b
CH		 926void __transport_remove_task_from_execute_queue(struct se_task *task,
927 struct se_device *dev)
928{
929 list_del_init(&task->t_execute_list);
930 atomic_dec(&dev->execute_tasks);
931}
932
52208ae3 933void transport_remove_task_from_execute_queue(
c66ac9db
NB		 934 struct se_task *task,
935 struct se_device *dev)
936{
937 unsigned long flags;
938
04629b7b 939 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 940 return;
af57c3ac 941
c66ac9db 942 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 943 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 944 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
945}
946
07bde79a
NB		 947/*
948 * Handle QUEUE_FULL / -EAGAIN status
949 */
950
951static void target_qf_do_work(struct work_struct *work)
952{
953 struct se_device *dev = container_of(work, struct se_device,
954 qf_work_queue);
bcac364a 955 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 956 struct se_cmd *cmd, *cmd_tmp;
957
958 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 959 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
960 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 961
bcac364a 962 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 963 list_del(&cmd->se_qf_node);
964 atomic_dec(&dev->dev_qf_count);
965 smp_mb__after_atomic_dec();
07bde79a 966
6708bb27 967 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 968 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 969 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 970 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
971 : "UNKNOWN");
f7a5cc0b
CH		 972
973 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 974 }
07bde79a
NB		 975}
976
c66ac9db
NB		 977unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
978{
979 switch (cmd->data_direction) {
980 case DMA_NONE:
981 return "NONE";
982 case DMA_FROM_DEVICE:
983 return "READ";
984 case DMA_TO_DEVICE:
985 return "WRITE";
986 case DMA_BIDIRECTIONAL:
987 return "BIDI";
988 default:
989 break;
990 }
991
992 return "UNKNOWN";
993}
994
995void transport_dump_dev_state(
996 struct se_device *dev,
997 char *b,
998 int *bl)
999{
1000 *bl += sprintf(b + *bl, "Status: ");
1001 switch (dev->dev_status) {
1002 case TRANSPORT_DEVICE_ACTIVATED:
1003 *bl += sprintf(b + *bl, "ACTIVATED");
1004 break;
1005 case TRANSPORT_DEVICE_DEACTIVATED:
1006 *bl += sprintf(b + *bl, "DEACTIVATED");
1007 break;
1008 case TRANSPORT_DEVICE_SHUTDOWN:
1009 *bl += sprintf(b + *bl, "SHUTDOWN");
1010 break;
1011 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1012 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1013 *bl += sprintf(b + *bl, "OFFLINE");
1014 break;
1015 default:
1016 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1017 break;
1018 }
1019
1020 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1021 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1022 dev->queue_depth);
1023 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1024 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1025 *bl += sprintf(b + *bl, " ");
1026}
1027
c66ac9db
NB		 1028void transport_dump_vpd_proto_id(
1029 struct t10_vpd *vpd,
1030 unsigned char *p_buf,
1031 int p_buf_len)
1032{
1033 unsigned char buf[VPD_TMP_BUF_SIZE];
1034 int len;
1035
1036 memset(buf, 0, VPD_TMP_BUF_SIZE);
1037 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1038
1039 switch (vpd->protocol_identifier) {
1040 case 0x00:
1041 sprintf(buf+len, "Fibre Channel\n");
1042 break;
1043 case 0x10:
1044 sprintf(buf+len, "Parallel SCSI\n");
1045 break;
1046 case 0x20:
1047 sprintf(buf+len, "SSA\n");
1048 break;
1049 case 0x30:
1050 sprintf(buf+len, "IEEE 1394\n");
1051 break;
1052 case 0x40:
1053 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1054 " Protocol\n");
1055 break;
1056 case 0x50:
1057 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1058 break;
1059 case 0x60:
1060 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1061 break;
1062 case 0x70:
1063 sprintf(buf+len, "Automation/Drive Interface Transport"
1064 " Protocol\n");
1065 break;
1066 case 0x80:
1067 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1068 break;
1069 default:
1070 sprintf(buf+len, "Unknown 0x%02x\n",
1071 vpd->protocol_identifier);
1072 break;
1073 }
1074
1075 if (p_buf)
1076 strncpy(p_buf, buf, p_buf_len);
1077 else
6708bb27 1078 pr_debug("%s", buf);
c66ac9db
NB		 1079}
1080
1081void
1082transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1083{
1084 /*
1085 * Check if the Protocol Identifier Valid (PIV) bit is set..
1086 *
1087 * from spc3r23.pdf section 7.5.1
1088 */
1089 if (page_83[1] & 0x80) {
1090 vpd->protocol_identifier = (page_83[0] & 0xf0);
1091 vpd->protocol_identifier_set = 1;
1092 transport_dump_vpd_proto_id(vpd, NULL, 0);
1093 }
1094}
1095EXPORT_SYMBOL(transport_set_vpd_proto_id);
1096
1097int transport_dump_vpd_assoc(
1098 struct t10_vpd *vpd,
1099 unsigned char *p_buf,
1100 int p_buf_len)
1101{
1102 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1103 int ret = 0;
1104 int len;
c66ac9db
NB		 1105
1106 memset(buf, 0, VPD_TMP_BUF_SIZE);
1107 len = sprintf(buf, "T10 VPD Identifier Association: ");
1108
1109 switch (vpd->association) {
1110 case 0x00:
1111 sprintf(buf+len, "addressed logical unit\n");
1112 break;
1113 case 0x10:
1114 sprintf(buf+len, "target port\n");
1115 break;
1116 case 0x20:
1117 sprintf(buf+len, "SCSI target device\n");
1118 break;
1119 default:
1120 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1121 ret = -EINVAL;
c66ac9db
NB		 1122 break;
1123 }
1124
1125 if (p_buf)
1126 strncpy(p_buf, buf, p_buf_len);
1127 else
6708bb27 1128 pr_debug("%s", buf);
c66ac9db
NB		 1129
1130 return ret;
1131}
1132
1133int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1134{
1135 /*
1136 * The VPD identification association..
1137 *
1138 * from spc3r23.pdf Section 7.6.3.1 Table 297
1139 */
1140 vpd->association = (page_83[1] & 0x30);
1141 return transport_dump_vpd_assoc(vpd, NULL, 0);
1142}
1143EXPORT_SYMBOL(transport_set_vpd_assoc);
1144
1145int transport_dump_vpd_ident_type(
1146 struct t10_vpd *vpd,
1147 unsigned char *p_buf,
1148 int p_buf_len)
1149{
1150 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1151 int ret = 0;
1152 int len;
c66ac9db
NB		 1153
1154 memset(buf, 0, VPD_TMP_BUF_SIZE);
1155 len = sprintf(buf, "T10 VPD Identifier Type: ");
1156
1157 switch (vpd->device_identifier_type) {
1158 case 0x00:
1159 sprintf(buf+len, "Vendor specific\n");
1160 break;
1161 case 0x01:
1162 sprintf(buf+len, "T10 Vendor ID based\n");
1163 break;
1164 case 0x02:
1165 sprintf(buf+len, "EUI-64 based\n");
1166 break;
1167 case 0x03:
1168 sprintf(buf+len, "NAA\n");
1169 break;
1170 case 0x04:
1171 sprintf(buf+len, "Relative target port identifier\n");
1172 break;
1173 case 0x08:
1174 sprintf(buf+len, "SCSI name string\n");
1175 break;
1176 default:
1177 sprintf(buf+len, "Unsupported: 0x%02x\n",
1178 vpd->device_identifier_type);
e3d6f909 1179 ret = -EINVAL;
c66ac9db
NB		 1180 break;
1181 }
1182
e3d6f909
AG		 1183 if (p_buf) {
1184 if (p_buf_len < strlen(buf)+1)
1185 return -EINVAL;
c66ac9db 1186 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1187 } else {
6708bb27 1188 pr_debug("%s", buf);
e3d6f909 1189 }
c66ac9db
NB		 1190
1191 return ret;
1192}
1193
1194int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1195{
1196 /*
1197 * The VPD identifier type..
1198 *
1199 * from spc3r23.pdf Section 7.6.3.1 Table 298
1200 */
1201 vpd->device_identifier_type = (page_83[1] & 0x0f);
1202 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1203}
1204EXPORT_SYMBOL(transport_set_vpd_ident_type);
1205
1206int transport_dump_vpd_ident(
1207 struct t10_vpd *vpd,
1208 unsigned char *p_buf,
1209 int p_buf_len)
1210{
1211 unsigned char buf[VPD_TMP_BUF_SIZE];
1212 int ret = 0;
1213
1214 memset(buf, 0, VPD_TMP_BUF_SIZE);
1215
1216 switch (vpd->device_identifier_code_set) {
1217 case 0x01: /* Binary */
1218 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1219 &vpd->device_identifier[0]);
1220 break;
1221 case 0x02: /* ASCII */
1222 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1223 &vpd->device_identifier[0]);
1224 break;
1225 case 0x03: /* UTF-8 */
1226 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1227 &vpd->device_identifier[0]);
1228 break;
1229 default:
1230 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1231 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1232 ret = -EINVAL;
c66ac9db
NB		 1233 break;
1234 }
1235
1236 if (p_buf)
1237 strncpy(p_buf, buf, p_buf_len);
1238 else
6708bb27 1239 pr_debug("%s", buf);
c66ac9db
NB		 1240
1241 return ret;
1242}
1243
1244int
1245transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1246{
1247 static const char hex_str[] = "0123456789abcdef";
1248 int j = 0, i = 4; /* offset to start of the identifer */
1249
1250 /*
1251 * The VPD Code Set (encoding)
1252 *
1253 * from spc3r23.pdf Section 7.6.3.1 Table 296
1254 */
1255 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1256 switch (vpd->device_identifier_code_set) {
1257 case 0x01: /* Binary */
1258 vpd->device_identifier[j++] =
1259 hex_str[vpd->device_identifier_type];
1260 while (i < (4 + page_83[3])) {
1261 vpd->device_identifier[j++] =
1262 hex_str[(page_83[i] & 0xf0) >> 4];
1263 vpd->device_identifier[j++] =
1264 hex_str[page_83[i] & 0x0f];
1265 i++;
1266 }
1267 break;
1268 case 0x02: /* ASCII */
1269 case 0x03: /* UTF-8 */
1270 while (i < (4 + page_83[3]))
1271 vpd->device_identifier[j++] = page_83[i++];
1272 break;
1273 default:
1274 break;
1275 }
1276
1277 return transport_dump_vpd_ident(vpd, NULL, 0);
1278}
1279EXPORT_SYMBOL(transport_set_vpd_ident);
1280
1281static void core_setup_task_attr_emulation(struct se_device *dev)
1282{
1283 /*
1284 * If this device is from Target_Core_Mod/pSCSI, disable the
1285 * SAM Task Attribute emulation.
1286 *
1287 * This is currently not available in upsream Linux/SCSI Target
1288 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1289 */
e3d6f909 1290 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1291 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1292 return;
1293 }
1294
1295 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1296 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1297 " device\n", dev->transport->name,
1298 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1299}
1300
1301static void scsi_dump_inquiry(struct se_device *dev)
1302{
e3d6f909 1303 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1304 int i, device_type;
1305 /*
1306 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1307 */
6708bb27 1308 pr_debug(" Vendor: ");
c66ac9db
NB		 1309 for (i = 0; i < 8; i++)
1310 if (wwn->vendor[i] >= 0x20)
6708bb27 1311 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1312 else
6708bb27 1313 pr_debug(" ");
c66ac9db 1314
6708bb27 1315 pr_debug(" Model: ");
c66ac9db
NB		 1316 for (i = 0; i < 16; i++)
1317 if (wwn->model[i] >= 0x20)
6708bb27 1318 pr_debug("%c", wwn->model[i]);
c66ac9db 1319 else
6708bb27 1320 pr_debug(" ");
c66ac9db 1321
6708bb27 1322 pr_debug(" Revision: ");
c66ac9db
NB		 1323 for (i = 0; i < 4; i++)
1324 if (wwn->revision[i] >= 0x20)
6708bb27 1325 pr_debug("%c", wwn->revision[i]);
c66ac9db 1326 else
6708bb27 1327 pr_debug(" ");
c66ac9db 1328
6708bb27 1329 pr_debug("\n");
c66ac9db 1330
e3d6f909 1331 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1332 pr_debug(" Type: %s ", scsi_device_type(device_type));
1333 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1334 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1335}
1336
1337struct se_device *transport_add_device_to_core_hba(
1338 struct se_hba *hba,
1339 struct se_subsystem_api *transport,
1340 struct se_subsystem_dev *se_dev,
1341 u32 device_flags,
1342 void *transport_dev,
1343 struct se_dev_limits *dev_limits,
1344 const char *inquiry_prod,
1345 const char *inquiry_rev)
1346{
12a18bdc 1347 int force_pt;
c66ac9db
NB		 1348 struct se_device *dev;
1349
1350 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1351 if (!dev) {
1352 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1353 return NULL;
1354 }
c66ac9db 1355
e3d6f909 1356 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1357 dev->dev_flags = device_flags;
1358 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1359 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1360 dev->se_hba = hba;
1361 dev->se_sub_dev = se_dev;
1362 dev->transport = transport;
1363 atomic_set(&dev->active_cmds, 0);
1364 INIT_LIST_HEAD(&dev->dev_list);
1365 INIT_LIST_HEAD(&dev->dev_sep_list);
1366 INIT_LIST_HEAD(&dev->dev_tmr_list);
1367 INIT_LIST_HEAD(&dev->execute_task_list);
1368 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1369 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1370 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1371 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1372 spin_lock_init(&dev->execute_task_lock);
1373 spin_lock_init(&dev->delayed_cmd_lock);
1374 spin_lock_init(&dev->ordered_cmd_lock);
1375 spin_lock_init(&dev->state_task_lock);
1376 spin_lock_init(&dev->dev_alua_lock);
1377 spin_lock_init(&dev->dev_reservation_lock);
1378 spin_lock_init(&dev->dev_status_lock);
1379 spin_lock_init(&dev->dev_status_thr_lock);
1380 spin_lock_init(&dev->se_port_lock);
1381 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1382 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1383
1384 dev->queue_depth = dev_limits->queue_depth;
1385 atomic_set(&dev->depth_left, dev->queue_depth);
1386 atomic_set(&dev->dev_ordered_id, 0);
1387
1388 se_dev_set_default_attribs(dev, dev_limits);
1389
1390 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1391 dev->creation_time = get_jiffies_64();
1392 spin_lock_init(&dev->stats_lock);
1393
1394 spin_lock(&hba->device_lock);
1395 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1396 hba->dev_count++;
1397 spin_unlock(&hba->device_lock);
1398 /*
1399 * Setup the SAM Task Attribute emulation for struct se_device
1400 */
1401 core_setup_task_attr_emulation(dev);
1402 /*
1403 * Force PR and ALUA passthrough emulation with internal object use.
1404 */
1405 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1406 /*
1407 * Setup the Reservations infrastructure for struct se_device
1408 */
1409 core_setup_reservations(dev, force_pt);
1410 /*
1411 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1412 */
1413 if (core_setup_alua(dev, force_pt) < 0)
1414 goto out;
1415
1416 /*
1417 * Startup the struct se_device processing thread
1418 */
1419 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1420 "LIO_%s", dev->transport->name);
c66ac9db 1421 if (IS_ERR(dev->process_thread)) {
6708bb27 1422 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1423 dev->transport->name);
c66ac9db
NB		 1424 goto out;
1425 }
07bde79a
NB		 1426 /*
1427 * Setup work_queue for QUEUE_FULL
1428 */
1429 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1430 /*
1431 * Preload the initial INQUIRY const values if we are doing
1432 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1433 * passthrough because this is being provided by the backend LLD.
1434 * This is required so that transport_get_inquiry() copies these
1435 * originals once back into DEV_T10_WWN(dev) for the virtual device
1436 * setup.
1437 */
e3d6f909 1438 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1439 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1440 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1441 " INQUIRY consts\n");
1442 goto out;
1443 }
1444
e3d6f909
AG		 1445 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1446 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1447 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1448 }
1449 scsi_dump_inquiry(dev);
1450
12a18bdc 1451 return dev;
c66ac9db 1452out:
c66ac9db
NB		 1453 kthread_stop(dev->process_thread);
1454
1455 spin_lock(&hba->device_lock);
1456 list_del(&dev->dev_list);
1457 hba->dev_count--;
1458 spin_unlock(&hba->device_lock);
1459
1460 se_release_vpd_for_dev(dev);
1461
c66ac9db
NB		 1462 kfree(dev);
1463
1464 return NULL;
1465}
1466EXPORT_SYMBOL(transport_add_device_to_core_hba);
1467
1468/* transport_generic_prepare_cdb():
1469 *
1470 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1471 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1472 * The point of this is since we are mapping iSCSI LUNs to
1473 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1474 * devices and HBAs for a loop.
1475 */
1476static inline void transport_generic_prepare_cdb(
1477 unsigned char *cdb)
1478{
1479 switch (cdb[0]) {
1480 case READ_10: /* SBC - RDProtect */
1481 case READ_12: /* SBC - RDProtect */
1482 case READ_16: /* SBC - RDProtect */
1483 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1484 case VERIFY: /* SBC - VRProtect */
1485 case VERIFY_16: /* SBC - VRProtect */
1486 case WRITE_VERIFY: /* SBC - VRProtect */
1487 case WRITE_VERIFY_12: /* SBC - VRProtect */
1488 break;
1489 default:
1490 cdb[1] &= 0x1f; /* clear logical unit number */
1491 break;
1492 }
1493}
1494
1495static struct se_task *
1496transport_generic_get_task(struct se_cmd *cmd,
1497 enum dma_data_direction data_direction)
1498{
1499 struct se_task *task;
5951146d 1500 struct se_device *dev = cmd->se_dev;
c66ac9db 1501
6708bb27 1502 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1503 if (!task) {
6708bb27 1504 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1505 return NULL;
1506 }
1507
1508 INIT_LIST_HEAD(&task->t_list);
1509 INIT_LIST_HEAD(&task->t_execute_list);
1510 INIT_LIST_HEAD(&task->t_state_list);
cc5d0f0f 1511 init_timer(&task->task_timer);
c66ac9db 1512 init_completion(&task->task_stop_comp);
c66ac9db 1513 task->task_se_cmd = cmd;
c66ac9db
NB		 1514 task->task_data_direction = data_direction;
1515
c66ac9db
NB		 1516 return task;
1517}
1518
1519static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1520
c66ac9db
NB		 1521/*
1522 * Used by fabric modules containing a local struct se_cmd within their
1523 * fabric dependent per I/O descriptor.
1524 */
1525void transport_init_se_cmd(
1526 struct se_cmd *cmd,
1527 struct target_core_fabric_ops *tfo,
1528 struct se_session *se_sess,
1529 u32 data_length,
1530 int data_direction,
1531 int task_attr,
1532 unsigned char *sense_buffer)
1533{
5951146d
AG		 1534 INIT_LIST_HEAD(&cmd->se_lun_node);
1535 INIT_LIST_HEAD(&cmd->se_delayed_node);
1536 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1537 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1538 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db 1539
a1d8b49a
AG		 1540 INIT_LIST_HEAD(&cmd->t_task_list);
1541 init_completion(&cmd->transport_lun_fe_stop_comp);
1542 init_completion(&cmd->transport_lun_stop_comp);
1543 init_completion(&cmd->t_transport_stop_comp);
1544 spin_lock_init(&cmd->t_state_lock);
1545 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1546
1547 cmd->se_tfo = tfo;
1548 cmd->se_sess = se_sess;
1549 cmd->data_length = data_length;
1550 cmd->data_direction = data_direction;
1551 cmd->sam_task_attr = task_attr;
1552 cmd->sense_buffer = sense_buffer;
1553}
1554EXPORT_SYMBOL(transport_init_se_cmd);
1555
1556static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1557{
1558 /*
1559 * Check if SAM Task Attribute emulation is enabled for this
1560 * struct se_device storage object
1561 */
5951146d 1562 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1563 return 0;
1564
e66ecd50 1565 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1566 pr_debug("SAM Task Attribute ACA"
c66ac9db 1567 " emulation is not supported\n");
e3d6f909 1568 return -EINVAL;
c66ac9db
NB		 1569 }
1570 /*
1571 * Used to determine when ORDERED commands should go from
1572 * Dormant to Active status.
1573 */
5951146d 1574 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1575 smp_mb__after_atomic_inc();
6708bb27 1576 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1577 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1578 cmd->se_dev->transport->name);
c66ac9db
NB		 1579 return 0;
1580}
1581
c66ac9db
NB		 1582/* transport_generic_allocate_tasks():
1583 *
1584 * Called from fabric RX Thread.
1585 */
1586int transport_generic_allocate_tasks(
1587 struct se_cmd *cmd,
1588 unsigned char *cdb)
1589{
1590 int ret;
1591
1592 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1593 /*
1594 * Ensure that the received CDB is less than the max (252 + 8) bytes
1595 * for VARIABLE_LENGTH_CMD
1596 */
1597 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1598 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1599 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1600 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1601 return -EINVAL;
c66ac9db
NB		 1602 }
1603 /*
1604 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1605 * allocate the additional extended CDB buffer now.. Otherwise
1606 * setup the pointer from __t_task_cdb to t_task_cdb.
1607 */
a1d8b49a
AG		 1608 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1609 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1610 GFP_KERNEL);
6708bb27
AG		 1611 if (!cmd->t_task_cdb) {
1612 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1613 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1614 scsi_command_size(cdb),
a1d8b49a 1615 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1616 return -ENOMEM;
c66ac9db
NB		 1617 }
1618 } else
a1d8b49a 1619 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1620 /*
a1d8b49a 1621 * Copy the original CDB into cmd->
c66ac9db 1622 */
a1d8b49a 1623 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1624 /*
1625 * Setup the received CDB based on SCSI defined opcodes and
1626 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1627 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1628 * pointer is expected to be setup before we reach this point.
1629 */
1630 ret = transport_generic_cmd_sequencer(cmd, cdb);
1631 if (ret < 0)
1632 return ret;
1633 /*
1634 * Check for SAM Task Attribute Emulation
1635 */
1636 if (transport_check_alloc_task_attr(cmd) < 0) {
1637 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1638 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1639 return -EINVAL;
c66ac9db
NB		 1640 }
1641 spin_lock(&cmd->se_lun->lun_sep_lock);
1642 if (cmd->se_lun->lun_sep)
1643 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1644 spin_unlock(&cmd->se_lun->lun_sep_lock);
1645 return 0;
1646}
1647EXPORT_SYMBOL(transport_generic_allocate_tasks);
1648
4499dda8
CH		 1649static void transport_generic_request_failure(struct se_cmd *, int, int);
1650
695434e1
NB		 1651/*
1652 * Used by fabric module frontends to queue tasks directly.
1653 * Many only be used from process context only
1654 */
1655int transport_handle_cdb_direct(
1656 struct se_cmd *cmd)
1657{
dd8ae59d
NB		 1658 int ret;
1659
695434e1
NB		 1660 if (!cmd->se_lun) {
1661 dump_stack();
6708bb27 1662 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1663 return -EINVAL;
1664 }
1665 if (in_interrupt()) {
1666 dump_stack();
6708bb27 1667 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1668 " from interrupt context\n");
1669 return -EINVAL;
1670 }
dd8ae59d
NB		 1671 /*
1672 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1673 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1674 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1675 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1676 *
1677 * Also, we don't take cmd->t_state_lock here as we only expect
1678 * this to be called for initial descriptor submission.
1679 */
1680 cmd->t_state = TRANSPORT_NEW_CMD;
1681 atomic_set(&cmd->t_transport_active, 1);
1682 /*
1683 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1684 * so follow TRANSPORT_NEW_CMD processing thread context usage
1685 * and call transport_generic_request_failure() if necessary..
1686 */
1687 ret = transport_generic_new_cmd(cmd);
1688 if (ret == -EAGAIN)
1689 return 0;
1690 else if (ret < 0) {
1691 cmd->transport_error_status = ret;
4499dda8 1692 transport_generic_request_failure(cmd, 0,
dd8ae59d
NB		 1693 (cmd->data_direction != DMA_TO_DEVICE));
1694 }
1695 return 0;
695434e1
NB		 1696}
1697EXPORT_SYMBOL(transport_handle_cdb_direct);
1698
c66ac9db
NB		 1699/*
1700 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1701 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1702 * complete setup in TCM process context w/ TFO->new_cmd_map().
1703 */
1704int transport_generic_handle_cdb_map(
1705 struct se_cmd *cmd)
1706{
e3d6f909 1707 if (!cmd->se_lun) {
c66ac9db 1708 dump_stack();
6708bb27 1709 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1710 return -EINVAL;
c66ac9db
NB		 1711 }
1712
f7a5cc0b 1713 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1714 return 0;
1715}
1716EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1717
1718/* transport_generic_handle_data():
1719 *
1720 *
1721 */
1722int transport_generic_handle_data(
1723 struct se_cmd *cmd)
1724{
1725 /*
1726 * For the software fabric case, then we assume the nexus is being
1727 * failed/shutdown when signals are pending from the kthread context
1728 * caller, so we return a failure. For the HW target mode case running
1729 * in interrupt code, the signal_pending() check is skipped.
1730 */
1731 if (!in_interrupt() && signal_pending(current))
e3d6f909 1732 return -EPERM;
c66ac9db
NB		 1733 /*
1734 * If the received CDB has aleady been ABORTED by the generic
1735 * target engine, we now call transport_check_aborted_status()
1736 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1737 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1738 * sequences at this point.
1739 */
1740 if (transport_check_aborted_status(cmd, 1) != 0)
1741 return 0;
1742
f7a5cc0b 1743 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1744 return 0;
1745}
1746EXPORT_SYMBOL(transport_generic_handle_data);
1747
1748/* transport_generic_handle_tmr():
1749 *
1750 *
1751 */
1752int transport_generic_handle_tmr(
1753 struct se_cmd *cmd)
1754{
f7a5cc0b 1755 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1756 return 0;
1757}
1758EXPORT_SYMBOL(transport_generic_handle_tmr);
1759
f4366772
NB		 1760void transport_generic_free_cmd_intr(
1761 struct se_cmd *cmd)
1762{
f7a5cc0b 1763 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
f4366772
NB		 1764}
1765EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1766
cdbb70bb
CH		 1767/*
1768 * If the task is active, request it to be stopped and sleep until it
1769 * has completed.
1770 */
1771bool target_stop_task(struct se_task *task, unsigned long *flags)
1772{
1773 struct se_cmd *cmd = task->task_se_cmd;
1774 bool was_active = false;
1775
1776 if (task->task_flags & TF_ACTIVE) {
1777 task->task_flags |= TF_REQUEST_STOP;
1778 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1779
1780 pr_debug("Task %p waiting to complete\n", task);
cc5d0f0f 1781 del_timer_sync(&task->task_timer);
cdbb70bb
CH		 1782 wait_for_completion(&task->task_stop_comp);
1783 pr_debug("Task %p stopped successfully\n", task);
1784
1785 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1786 atomic_dec(&cmd->t_task_cdbs_left);
1787 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1788 was_active = true;
1789 }
1790
cdbb70bb
CH		 1791 return was_active;
1792}
1793
c66ac9db
NB		 1794static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1795{
1796 struct se_task *task, *task_tmp;
1797 unsigned long flags;
1798 int ret = 0;
1799
6708bb27 1800 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1801 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1802
1803 /*
1804 * No tasks remain in the execution queue
1805 */
a1d8b49a 1806 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1807 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1808 &cmd->t_task_list, t_list) {
04629b7b 1809 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1810 /*
1811 * If the struct se_task has not been sent and is not active,
1812 * remove the struct se_task from the execution queue.
1813 */
6c76bf95 1814 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1815 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1816 flags);
1817 transport_remove_task_from_execute_queue(task,
42bf829e 1818 cmd->se_dev);
c66ac9db 1819
04629b7b 1820 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1821 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1822 continue;
1823 }
1824
cdbb70bb 1825 if (!target_stop_task(task, &flags)) {
04629b7b 1826 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1827 ret++;
1828 }
c66ac9db 1829 }
a1d8b49a 1830 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1831
1832 return ret;
1833}
1834
c66ac9db
NB		 1835/*
1836 * Handle SAM-esque emulation for generic transport request failures.
1837 */
1838static void transport_generic_request_failure(
1839 struct se_cmd *cmd,
c66ac9db
NB		 1840 int complete,
1841 int sc)
1842{
07bde79a
NB		 1843 int ret = 0;
1844
6708bb27 1845 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1846 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1847 cmd->t_task_cdb[0]);
6708bb27 1848 pr_debug("-----[ i_state: %d t_state/def_t_state:"
c66ac9db 1849 " %d/%d transport_error_status: %d\n",
e3d6f909 1850 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db
NB		 1851 cmd->t_state, cmd->deferred_t_state,
1852 cmd->transport_error_status);
6708bb27 1853 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1854 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1855 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1856 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1857 atomic_read(&cmd->t_task_cdbs_left),
1858 atomic_read(&cmd->t_task_cdbs_sent),
1859 atomic_read(&cmd->t_task_cdbs_ex_left),
1860 atomic_read(&cmd->t_transport_active),
1861 atomic_read(&cmd->t_transport_stop),
1862 atomic_read(&cmd->t_transport_sent));
c66ac9db 1863
c66ac9db
NB		 1864 /*
1865 * For SAM Task Attribute emulation for failed struct se_cmd
1866 */
1867 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1868 transport_complete_task_attr(cmd);
1869
1870 if (complete) {
1871 transport_direct_request_timeout(cmd);
1872 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1873 }
1874
1875 switch (cmd->transport_error_status) {
1876 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1877 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1878 break;
1879 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1880 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1881 break;
1882 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1883 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1884 break;
1885 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1886 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1887 break;
1888 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1889 if (!sc)
1890 transport_new_cmd_failure(cmd);
1891 /*
1892 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1893 * we force this session to fall back to session
1894 * recovery.
1895 */
e3d6f909
AG		 1896 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1897 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 1898
1899 goto check_stop;
1900 case PYX_TRANSPORT_LU_COMM_FAILURE:
1901 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1902 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1903 break;
1904 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1905 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1906 break;
1907 case PYX_TRANSPORT_WRITE_PROTECTED:
1908 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1909 break;
1910 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1911 /*
1912 * No SENSE Data payload for this case, set SCSI Status
1913 * and queue the response to $FABRIC_MOD.
1914 *
1915 * Uses linux/include/scsi/scsi.h SAM status codes defs
1916 */
1917 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1918 /*
1919 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1920 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1921 * CONFLICT STATUS.
1922 *
1923 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1924 */
e3d6f909
AG		 1925 if (cmd->se_sess &&
1926 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1927 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1928 cmd->orig_fe_lun, 0x2C,
1929 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1930
07bde79a
NB		 1931 ret = cmd->se_tfo->queue_status(cmd);
1932 if (ret == -EAGAIN)
1933 goto queue_full;
c66ac9db
NB		 1934 goto check_stop;
1935 case PYX_TRANSPORT_USE_SENSE_REASON:
1936 /*
1937 * struct se_cmd->scsi_sense_reason already set
1938 */
1939 break;
1940 default:
6708bb27 1941 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 1942 cmd->t_task_cdb[0],
c66ac9db
NB		 1943 cmd->transport_error_status);
1944 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1945 break;
1946 }
16ab8e60
NB		 1947 /*
1948 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1949 * make the call to transport_send_check_condition_and_sense()
1950 * directly. Otherwise expect the fabric to make the call to
1951 * transport_send_check_condition_and_sense() after handling
1952 * possible unsoliticied write data payloads.
1953 */
1954 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 1955 transport_new_cmd_failure(cmd);
07bde79a
NB		 1956 else {
1957 ret = transport_send_check_condition_and_sense(cmd,
1958 cmd->scsi_sense_reason, 0);
1959 if (ret == -EAGAIN)
1960 goto queue_full;
1961 }
1962
c66ac9db
NB		 1963check_stop:
1964 transport_lun_remove_cmd(cmd);
6708bb27 1965 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1966 ;
07bde79a
NB		 1967 return;
1968
1969queue_full:
e057f533
CH		 1970 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1971 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1972}
1973
1974static void transport_direct_request_timeout(struct se_cmd *cmd)
1975{
1976 unsigned long flags;
1977
a1d8b49a 1978 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 1979 if (!atomic_read(&cmd->t_transport_timeout)) {
a1d8b49a 1980 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1981 return;
1982 }
a1d8b49a
AG		 1983 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
1984 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1985 return;
1986 }
1987
a1d8b49a
AG		 1988 atomic_sub(atomic_read(&cmd->t_transport_timeout),
1989 &cmd->t_se_count);
1990 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1991}
1992
1993static void transport_generic_request_timeout(struct se_cmd *cmd)
1994{
1995 unsigned long flags;
1996
1997 /*
e6a2573f 1998 * Reset cmd->t_se_count to allow transport_put_cmd()
c66ac9db
NB		 1999 * to allow last call to free memory resources.
2000 */
a1d8b49a
AG		 2001 spin_lock_irqsave(&cmd->t_state_lock, flags);
2002 if (atomic_read(&cmd->t_transport_timeout) > 1) {
2003 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 2004
a1d8b49a 2005 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2006 }
a1d8b49a 2007 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2008
e6a2573f 2009 transport_put_cmd(cmd);
c66ac9db
NB		 2010}
2011
c66ac9db
NB		 2012static inline u32 transport_lba_21(unsigned char *cdb)
2013{
2014 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2015}
2016
2017static inline u32 transport_lba_32(unsigned char *cdb)
2018{
2019 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2020}
2021
2022static inline unsigned long long transport_lba_64(unsigned char *cdb)
2023{
2024 unsigned int __v1, __v2;
2025
2026 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2027 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2028
2029 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2030}
2031
2032/*
2033 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2034 */
2035static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2036{
2037 unsigned int __v1, __v2;
2038
2039 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2040 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2041
2042 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2043}
2044
2045static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2046{
2047 unsigned long flags;
2048
a1d8b49a 2049 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2050 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2051 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2052}
2053
2054/*
2055 * Called from interrupt context.
2056 */
2057static void transport_task_timeout_handler(unsigned long data)
2058{
2059 struct se_task *task = (struct se_task *)data;
e3d6f909 2060 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2061 unsigned long flags;
2062
6708bb27 2063 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
c66ac9db 2064
a1d8b49a 2065 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2066
2067 /*
2068 * Determine if transport_complete_task() has already been called.
2069 */
6c76bf95
CH		 2070 if (!(task->task_flags & TF_ACTIVE)) {
2071 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2072 task, cmd);
a1d8b49a 2073 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2074 return;
2075 }
2076
a1d8b49a
AG		 2077 atomic_inc(&cmd->t_se_count);
2078 atomic_inc(&cmd->t_transport_timeout);
2079 cmd->t_tasks_failed = 1;
c66ac9db 2080
6c76bf95 2081 task->task_flags |= TF_TIMEOUT;
c66ac9db
NB		 2082 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2083 task->task_scsi_status = 1;
2084
6c76bf95
CH		 2085 if (task->task_flags & TF_REQUEST_STOP) {
2086 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
c66ac9db 2087 " == 1\n", task, cmd);
a1d8b49a 2088 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2089 complete(&task->task_stop_comp);
2090 return;
2091 }
2092
6708bb27
AG		 2093 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2094 pr_debug("transport task: %p cmd: %p timeout non zero"
c66ac9db 2095 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2096 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2097 return;
2098 }
6708bb27 2099 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
c66ac9db
NB		 2100 task, cmd);
2101
2102 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
a1d8b49a 2103 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2104
f7a5cc0b 2105 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE, false);
c66ac9db
NB		 2106}
2107
c66ac9db
NB		 2108static void transport_start_task_timer(struct se_task *task)
2109{
42bf829e 2110 struct se_device *dev = task->task_se_cmd->se_dev;
c66ac9db
NB		 2111 int timeout;
2112
c66ac9db
NB		 2113 /*
2114 * If the task_timeout is disabled, exit now.
2115 */
e3d6f909 2116 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
6708bb27 2117 if (!timeout)
c66ac9db
NB		 2118 return;
2119
c66ac9db
NB		 2120 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2121 task->task_timer.data = (unsigned long) task;
2122 task->task_timer.function = transport_task_timeout_handler;
c66ac9db 2123 add_timer(&task->task_timer);
c66ac9db
NB		 2124}
2125
2126static inline int transport_tcq_window_closed(struct se_device *dev)
2127{
2128 if (dev->dev_tcq_window_closed++ <
2129 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2130 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2131 } else
2132 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2133
e3d6f909 2134 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2135 return 0;
2136}
2137
2138/*
2139 * Called from Fabric Module context from transport_execute_tasks()
2140 *
2141 * The return of this function determins if the tasks from struct se_cmd
2142 * get added to the execution queue in transport_execute_tasks(),
2143 * or are added to the delayed or ordered lists here.
2144 */
2145static inline int transport_execute_task_attr(struct se_cmd *cmd)
2146{
5951146d 2147 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2148 return 1;
2149 /*
25985edc 2150 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2151 * to allow the passed struct se_cmd list of tasks to the front of the list.
2152 */
e66ecd50 2153 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2154 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2155 smp_mb__after_atomic_inc();
6708bb27 2156 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2157 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2158 cmd->t_task_cdb[0],
c66ac9db
NB		 2159 cmd->se_ordered_id);
2160 return 1;
e66ecd50 2161 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2162 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2163 list_add_tail(&cmd->se_ordered_node,
2164 &cmd->se_dev->ordered_cmd_list);
2165 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2166
5951146d 2167 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2168 smp_mb__after_atomic_inc();
2169
6708bb27 2170 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2171 " list, se_ordered_id: %u\n",
a1d8b49a 2172 cmd->t_task_cdb[0],
c66ac9db
NB		 2173 cmd->se_ordered_id);
2174 /*
2175 * Add ORDERED command to tail of execution queue if
2176 * no other older commands exist that need to be
2177 * completed first.
2178 */
6708bb27 2179 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2180 return 1;
2181 } else {
2182 /*
2183 * For SIMPLE and UNTAGGED Task Attribute commands
2184 */
5951146d 2185 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2186 smp_mb__after_atomic_inc();
2187 }
2188 /*
2189 * Otherwise if one or more outstanding ORDERED task attribute exist,
2190 * add the dormant task(s) built for the passed struct se_cmd to the
2191 * execution queue and become in Active state for this struct se_device.
2192 */
5951146d 2193 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2194 /*
2195 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2196 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2197 */
5951146d 2198 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2199 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2200 list_add_tail(&cmd->se_delayed_node,
2201 &cmd->se_dev->delayed_cmd_list);
2202 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2203
6708bb27 2204 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2205 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2206 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2207 cmd->se_ordered_id);
2208 /*
2209 * Return zero to let transport_execute_tasks() know
2210 * not to add the delayed tasks to the execution list.
2211 */
2212 return 0;
2213 }
2214 /*
2215 * Otherwise, no ORDERED task attributes exist..
2216 */
2217 return 1;
2218}
2219
2220/*
2221 * Called from fabric module context in transport_generic_new_cmd() and
2222 * transport_generic_process_write()
2223 */
2224static int transport_execute_tasks(struct se_cmd *cmd)
2225{
2226 int add_tasks;
2227
db1620a2
CH		 2228 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2229 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
4499dda8 2230 transport_generic_request_failure(cmd, 0, 1);
db1620a2 2231 return 0;
c66ac9db 2232 }
db1620a2 2233
c66ac9db
NB		 2234 /*
2235 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2236 * has occurred that prevents execution.
c66ac9db 2237 */
6708bb27 2238 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2239 /*
2240 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2241 * attribute for the tasks of the received struct se_cmd CDB
2242 */
2243 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2244 if (!add_tasks)
c66ac9db
NB		 2245 goto execute_tasks;
2246 /*
2247 * This calls transport_add_tasks_from_cmd() to handle
2248 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2249 * (if enabled) in __transport_add_task_to_execute_queue() and
2250 * transport_add_task_check_sam_attr().
2251 */
2252 transport_add_tasks_from_cmd(cmd);
2253 }
2254 /*
2255 * Kick the execution queue for the cmd associated struct se_device
2256 * storage object.
2257 */
2258execute_tasks:
5951146d 2259 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2260 return 0;
2261}
2262
2263/*
2264 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2265 * from struct se_device->execute_task_list and
2266 *
2267 * Called from transport_processing_thread()
2268 */
2269static int __transport_execute_tasks(struct se_device *dev)
2270{
2271 int error;
2272 struct se_cmd *cmd = NULL;
e3d6f909 2273 struct se_task *task = NULL;
c66ac9db
NB		 2274 unsigned long flags;
2275
2276 /*
2277 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2278 * struct se_tasks to the selected transport.
c66ac9db
NB		 2279 */
2280check_depth:
e3d6f909 2281 if (!atomic_read(&dev->depth_left))
c66ac9db 2282 return transport_tcq_window_closed(dev);
c66ac9db 2283
e3d6f909 2284 dev->dev_tcq_window_closed = 0;
c66ac9db 2285
e3d6f909
AG		 2286 spin_lock_irq(&dev->execute_task_lock);
2287 if (list_empty(&dev->execute_task_list)) {
2288 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2289 return 0;
2290 }
e3d6f909
AG		 2291 task = list_first_entry(&dev->execute_task_list,
2292 struct se_task, t_execute_list);
04629b7b 2293 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2294 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2295
2296 atomic_dec(&dev->depth_left);
c66ac9db 2297
e3d6f909 2298 cmd = task->task_se_cmd;
c66ac9db 2299
a1d8b49a 2300 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2301 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2302 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2303
a1d8b49a
AG		 2304 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2305 cmd->t_task_list_num)
c66ac9db
NB		 2306 atomic_set(&cmd->transport_sent, 1);
2307
2308 transport_start_task_timer(task);
a1d8b49a 2309 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2310 /*
2311 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2312 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2313 * struct se_subsystem_api->do_task() caller below.
2314 */
2315 if (cmd->transport_emulate_cdb) {
2316 error = cmd->transport_emulate_cdb(cmd);
2317 if (error != 0) {
2318 cmd->transport_error_status = error;
6c76bf95
CH		 2319 spin_lock_irqsave(&cmd->t_state_lock, flags);
2320 task->task_flags &= ~TF_ACTIVE;
2321 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cc5d0f0f 2322 del_timer_sync(&task->task_timer);
c66ac9db
NB		 2323 atomic_set(&cmd->transport_sent, 0);
2324 transport_stop_tasks_for_cmd(cmd);
4499dda8
CH		 2325 atomic_inc(&dev->depth_left);
2326 transport_generic_request_failure(cmd, 0, 1);
c66ac9db
NB		 2327 goto check_depth;
2328 }
2329 /*
2330 * Handle the successful completion for transport_emulate_cdb()
2331 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2332 * Otherwise the caller is expected to complete the task with
2333 * proper status.
2334 */
2335 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2336 cmd->scsi_status = SAM_STAT_GOOD;
2337 task->task_scsi_status = GOOD;
2338 transport_complete_task(task, 1);
2339 }
2340 } else {
2341 /*
2342 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2343 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2344 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2345 * LUN emulation code.
2346 *
2347 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2348 * call ->do_task() directly and let the underlying TCM subsystem plugin
2349 * code handle the CDB emulation.
2350 */
e3d6f909
AG		 2351 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2352 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2353 error = transport_emulate_control_cdb(task);
2354 else
e3d6f909 2355 error = dev->transport->do_task(task);
c66ac9db
NB		 2356
2357 if (error != 0) {
2358 cmd->transport_error_status = error;
6c76bf95
CH		 2359 spin_lock_irqsave(&cmd->t_state_lock, flags);
2360 task->task_flags &= ~TF_ACTIVE;
2361 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cc5d0f0f 2362 del_timer_sync(&task->task_timer);
c66ac9db
NB		 2363 atomic_set(&cmd->transport_sent, 0);
2364 transport_stop_tasks_for_cmd(cmd);
4499dda8
CH		 2365 atomic_inc(&dev->depth_left);
2366 transport_generic_request_failure(cmd, 0, 1);
c66ac9db
NB		 2367 }
2368 }
2369
2370 goto check_depth;
2371
2372 return 0;
2373}
2374
2375void transport_new_cmd_failure(struct se_cmd *se_cmd)
2376{
2377 unsigned long flags;
2378 /*
2379 * Any unsolicited data will get dumped for failed command inside of
2380 * the fabric plugin
2381 */
a1d8b49a 2382 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2383 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2384 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2385 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2386}
2387
c66ac9db
NB		 2388static inline u32 transport_get_sectors_6(
2389 unsigned char *cdb,
2390 struct se_cmd *cmd,
2391 int *ret)
2392{
5951146d 2393 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2394
2395 /*
2396 * Assume TYPE_DISK for non struct se_device objects.
2397 * Use 8-bit sector value.
2398 */
2399 if (!dev)
2400 goto type_disk;
2401
2402 /*
2403 * Use 24-bit allocation length for TYPE_TAPE.
2404 */
e3d6f909 2405 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2406 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2407
2408 /*
2409 * Everything else assume TYPE_DISK Sector CDB location.
2410 * Use 8-bit sector value.
2411 */
2412type_disk:
2413 return (u32)cdb[4];
2414}
2415
2416static inline u32 transport_get_sectors_10(
2417 unsigned char *cdb,
2418 struct se_cmd *cmd,
2419 int *ret)
2420{
5951146d 2421 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2422
2423 /*
2424 * Assume TYPE_DISK for non struct se_device objects.
2425 * Use 16-bit sector value.
2426 */
2427 if (!dev)
2428 goto type_disk;
2429
2430 /*
2431 * XXX_10 is not defined in SSC, throw an exception
2432 */
e3d6f909
AG		 2433 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2434 *ret = -EINVAL;
c66ac9db
NB		 2435 return 0;
2436 }
2437
2438 /*
2439 * Everything else assume TYPE_DISK Sector CDB location.
2440 * Use 16-bit sector value.
2441 */
2442type_disk:
2443 return (u32)(cdb[7] << 8) + cdb[8];
2444}
2445
2446static inline u32 transport_get_sectors_12(
2447 unsigned char *cdb,
2448 struct se_cmd *cmd,
2449 int *ret)
2450{
5951146d 2451 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2452
2453 /*
2454 * Assume TYPE_DISK for non struct se_device objects.
2455 * Use 32-bit sector value.
2456 */
2457 if (!dev)
2458 goto type_disk;
2459
2460 /*
2461 * XXX_12 is not defined in SSC, throw an exception
2462 */
e3d6f909
AG		 2463 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2464 *ret = -EINVAL;
c66ac9db
NB		 2465 return 0;
2466 }
2467
2468 /*
2469 * Everything else assume TYPE_DISK Sector CDB location.
2470 * Use 32-bit sector value.
2471 */
2472type_disk:
2473 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2474}
2475
2476static inline u32 transport_get_sectors_16(
2477 unsigned char *cdb,
2478 struct se_cmd *cmd,
2479 int *ret)
2480{
5951146d 2481 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2482
2483 /*
2484 * Assume TYPE_DISK for non struct se_device objects.
2485 * Use 32-bit sector value.
2486 */
2487 if (!dev)
2488 goto type_disk;
2489
2490 /*
2491 * Use 24-bit allocation length for TYPE_TAPE.
2492 */
e3d6f909 2493 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2494 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2495
2496type_disk:
2497 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2498 (cdb[12] << 8) + cdb[13];
2499}
2500
2501/*
2502 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2503 */
2504static inline u32 transport_get_sectors_32(
2505 unsigned char *cdb,
2506 struct se_cmd *cmd,
2507 int *ret)
2508{
2509 /*
2510 * Assume TYPE_DISK for non struct se_device objects.
2511 * Use 32-bit sector value.
2512 */
2513 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2514 (cdb[30] << 8) + cdb[31];
2515
2516}
2517
2518static inline u32 transport_get_size(
2519 u32 sectors,
2520 unsigned char *cdb,
2521 struct se_cmd *cmd)
2522{
5951146d 2523 struct se_device *dev = cmd->se_dev;
c66ac9db 2524
e3d6f909 2525 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2526 if (cdb[1] & 1) { /* sectors */
e3d6f909 2527 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2528 } else /* bytes */
2529 return sectors;
2530 }
2531#if 0
6708bb27 2532 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2533 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2534 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2535 dev->transport->name);
c66ac9db 2536#endif
e3d6f909 2537 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2538}
2539
c66ac9db
NB		 2540static void transport_xor_callback(struct se_cmd *cmd)
2541{
2542 unsigned char *buf, *addr;
ec98f782 2543 struct scatterlist *sg;
c66ac9db
NB		 2544 unsigned int offset;
2545 int i;
ec98f782 2546 int count;
c66ac9db
NB		 2547 /*
2548 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2549 *
2550 * 1) read the specified logical block(s);
2551 * 2) transfer logical blocks from the data-out buffer;
2552 * 3) XOR the logical blocks transferred from the data-out buffer with
2553 * the logical blocks read, storing the resulting XOR data in a buffer;
2554 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2555 * blocks transferred from the data-out buffer; and
2556 * 5) transfer the resulting XOR data to the data-in buffer.
2557 */
2558 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2559 if (!buf) {
2560 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2561 return;
2562 }
2563 /*
ec98f782 2564 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2565 * into the locally allocated *buf
2566 */
ec98f782
AG		 2567 sg_copy_to_buffer(cmd->t_data_sg,
2568 cmd->t_data_nents,
2569 buf,
2570 cmd->data_length);
2571
c66ac9db
NB		 2572 /*
2573 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2574 * cmd->t_mem_bidi_list
c66ac9db
NB		 2575 */
2576
2577 offset = 0;
ec98f782
AG		 2578 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2579 addr = kmap_atomic(sg_page(sg), KM_USER0);
2580 if (!addr)
c66ac9db
NB		 2581 goto out;
2582
ec98f782
AG		 2583 for (i = 0; i < sg->length; i++)
2584 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2585
ec98f782 2586 offset += sg->length;
c66ac9db
NB		 2587 kunmap_atomic(addr, KM_USER0);
2588 }
ec98f782 2589
c66ac9db
NB		 2590out:
2591 kfree(buf);
2592}
2593
2594/*
2595 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2596 */
2597static int transport_get_sense_data(struct se_cmd *cmd)
2598{
2599 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2600 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2601 struct se_task *task = NULL, *task_tmp;
2602 unsigned long flags;
2603 u32 offset = 0;
2604
e3d6f909
AG		 2605 WARN_ON(!cmd->se_lun);
2606
42bf829e
CH		 2607 if (!dev)
2608 return 0;
2609
a1d8b49a 2610 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2611 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2612 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2613 return 0;
2614 }
2615
2616 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2617 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2618 if (!task->task_sense)
2619 continue;
2620
e3d6f909 2621 if (!dev->transport->get_sense_buffer) {
6708bb27 2622 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2623 " is NULL\n");
2624 continue;
2625 }
2626
e3d6f909 2627 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2628 if (!sense_buffer) {
04629b7b 2629 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2630 " sense buffer for task with sense\n",
04629b7b 2631 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2632 continue;
2633 }
a1d8b49a 2634 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2635
e3d6f909 2636 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2637 TRANSPORT_SENSE_BUFFER);
2638
5951146d 2639 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2640 TRANSPORT_SENSE_BUFFER);
2641 cmd->scsi_status = task->task_scsi_status;
2642 /* Automatically padded */
2643 cmd->scsi_sense_length =
2644 (TRANSPORT_SENSE_BUFFER + offset);
2645
6708bb27 2646 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2647 " and sense\n",
e3d6f909 2648 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2649 cmd->scsi_status);
2650 return 0;
2651 }
a1d8b49a 2652 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2653
2654 return -1;
2655}
2656
c66ac9db
NB		 2657static int
2658transport_handle_reservation_conflict(struct se_cmd *cmd)
2659{
c66ac9db
NB		 2660 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2661 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2662 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2663 /*
2664 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2665 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2666 * CONFLICT STATUS.
2667 *
2668 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2669 */
e3d6f909
AG		 2670 if (cmd->se_sess &&
2671 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2672 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2673 cmd->orig_fe_lun, 0x2C,
2674 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2675 return -EINVAL;
c66ac9db
NB		 2676}
2677
ec98f782
AG		 2678static inline long long transport_dev_end_lba(struct se_device *dev)
2679{
2680 return dev->transport->get_blocks(dev) + 1;
2681}
2682
2683static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2684{
2685 struct se_device *dev = cmd->se_dev;
2686 u32 sectors;
2687
2688 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2689 return 0;
2690
2691 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2692
6708bb27
AG		 2693 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2694 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2695 " transport_dev_end_lba(): %llu\n",
2696 cmd->t_task_lba, sectors,
2697 transport_dev_end_lba(dev));
7abbe7f3 2698 return -EINVAL;
ec98f782
AG		 2699 }
2700
7abbe7f3 2701 return 0;
ec98f782
AG		 2702}
2703
706d5860
NB		 2704static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2705{
2706 /*
2707 * Determine if the received WRITE_SAME is used to for direct
2708 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2709 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2710 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2711 */
2712 int passthrough = (dev->transport->transport_type ==
2713 TRANSPORT_PLUGIN_PHBA_PDEV);
2714
2715 if (!passthrough) {
2716 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2717 pr_err("WRITE_SAME PBDATA and LBDATA"
2718 " bits not supported for Block Discard"
2719 " Emulation\n");
2720 return -ENOSYS;
2721 }
2722 /*
2723 * Currently for the emulated case we only accept
2724 * tpws with the UNMAP=1 bit set.
2725 */
2726 if (!(flags[0] & 0x08)) {
2727 pr_err("WRITE_SAME w/o UNMAP bit not"
2728 " supported for Block Discard Emulation\n");
2729 return -ENOSYS;
2730 }
2731 }
2732
2733 return 0;
2734}
2735
c66ac9db
NB		 2736/* transport_generic_cmd_sequencer():
2737 *
2738 * Generic Command Sequencer that should work for most DAS transport
2739 * drivers.
2740 *
2741 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2742 * RX Thread.
2743 *
2744 * FIXME: Need to support other SCSI OPCODES where as well.
2745 */
2746static int transport_generic_cmd_sequencer(
2747 struct se_cmd *cmd,
2748 unsigned char *cdb)
2749{
5951146d 2750 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2751 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2752 int ret = 0, sector_ret = 0, passthrough;
2753 u32 sectors = 0, size = 0, pr_reg_type = 0;
2754 u16 service_action;
2755 u8 alua_ascq = 0;
2756 /*
2757 * Check for an existing UNIT ATTENTION condition
2758 */
2759 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2760 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2761 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2762 return -EINVAL;
c66ac9db
NB		 2763 }
2764 /*
2765 * Check status of Asymmetric Logical Unit Assignment port
2766 */
e3d6f909 2767 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2768 if (ret != 0) {
c66ac9db 2769 /*
25985edc 2770 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2771 * The ALUA additional sense code qualifier (ASCQ) is determined
2772 * by the ALUA primary or secondary access state..
2773 */
2774 if (ret > 0) {
2775#if 0
6708bb27 2776 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2777 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2778 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2779#endif
2780 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2781 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2782 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2783 return -EINVAL;
c66ac9db
NB		 2784 }
2785 goto out_invalid_cdb_field;
2786 }
2787 /*
2788 * Check status for SPC-3 Persistent Reservations
2789 */
e3d6f909
AG		 2790 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2791 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2792 cmd, cdb, pr_reg_type) != 0)
2793 return transport_handle_reservation_conflict(cmd);
2794 /*
2795 * This means the CDB is allowed for the SCSI Initiator port
2796 * when said port is *NOT* holding the legacy SPC-2 or
2797 * SPC-3 Persistent Reservation.
2798 */
2799 }
2800
2801 switch (cdb[0]) {
2802 case READ_6:
2803 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2804 if (sector_ret)
2805 goto out_unsupported_cdb;
2806 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2807 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2808 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2809 break;
2810 case READ_10:
2811 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2812 if (sector_ret)
2813 goto out_unsupported_cdb;
2814 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2815 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2816 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2817 break;
2818 case READ_12:
2819 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2820 if (sector_ret)
2821 goto out_unsupported_cdb;
2822 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2823 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2824 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2825 break;
2826 case READ_16:
2827 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2828 if (sector_ret)
2829 goto out_unsupported_cdb;
2830 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2831 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2832 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2833 break;
2834 case WRITE_6:
2835 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2836 if (sector_ret)
2837 goto out_unsupported_cdb;
2838 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2839 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2840 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2841 break;
2842 case WRITE_10:
2843 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2844 if (sector_ret)
2845 goto out_unsupported_cdb;
2846 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2847 cmd->t_task_lba = transport_lba_32(cdb);
2848 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2849 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2850 break;
2851 case WRITE_12:
2852 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2853 if (sector_ret)
2854 goto out_unsupported_cdb;
2855 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2856 cmd->t_task_lba = transport_lba_32(cdb);
2857 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2858 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2859 break;
2860 case WRITE_16:
2861 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2862 if (sector_ret)
2863 goto out_unsupported_cdb;
2864 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2865 cmd->t_task_lba = transport_lba_64(cdb);
2866 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2867 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2868 break;
2869 case XDWRITEREAD_10:
2870 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 2871 !(cmd->t_tasks_bidi))
c66ac9db
NB		 2872 goto out_invalid_cdb_field;
2873 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2874 if (sector_ret)
2875 goto out_unsupported_cdb;
2876 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2877 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2878 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 2879 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2880 TRANSPORT_PLUGIN_PHBA_PDEV);
2881 /*
2882 * Skip the remaining assignments for TCM/PSCSI passthrough
2883 */
2884 if (passthrough)
2885 break;
2886 /*
2887 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2888 */
2889 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2890 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2891 break;
2892 case VARIABLE_LENGTH_CMD:
2893 service_action = get_unaligned_be16(&cdb[8]);
2894 /*
2895 * Determine if this is TCM/PSCSI device and we should disable
2896 * internal emulation for this CDB.
2897 */
e3d6f909 2898 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2899 TRANSPORT_PLUGIN_PHBA_PDEV);
2900
2901 switch (service_action) {
2902 case XDWRITEREAD_32:
2903 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2904 if (sector_ret)
2905 goto out_unsupported_cdb;
2906 size = transport_get_size(sectors, cdb, cmd);
2907 /*
2908 * Use WRITE_32 and READ_32 opcodes for the emulated
2909 * XDWRITE_READ_32 logic.
2910 */
a1d8b49a 2911 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2912 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2913
2914 /*
2915 * Skip the remaining assignments for TCM/PSCSI passthrough
2916 */
2917 if (passthrough)
2918 break;
2919
2920 /*
2921 * Setup BIDI XOR callback to be run during
2922 * transport_generic_complete_ok()
2923 */
2924 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2925 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 2926 break;
2927 case WRITE_SAME_32:
2928 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2929 if (sector_ret)
2930 goto out_unsupported_cdb;
dd3a5ad8 2931
6708bb27 2932 if (sectors)
12850626 2933 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2934 else {
2935 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2936 " supported\n");
2937 goto out_invalid_cdb_field;
2938 }
dd3a5ad8 2939
a1d8b49a 2940 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2941 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2942
706d5860 2943 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2944 goto out_invalid_cdb_field;
706d5860 2945
c66ac9db
NB		 2946 break;
2947 default:
6708bb27 2948 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2949 " 0x%04x not supported\n", service_action);
2950 goto out_unsupported_cdb;
2951 }
2952 break;
e434f1f1 2953 case MAINTENANCE_IN:
e3d6f909 2954 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2955 /* MAINTENANCE_IN from SCC-2 */
2956 /*
2957 * Check for emulated MI_REPORT_TARGET_PGS.
2958 */
2959 if (cdb[1] == MI_REPORT_TARGET_PGS) {
2960 cmd->transport_emulate_cdb =
e3d6f909 2961 (su_dev->t10_alua.alua_type ==
c66ac9db 2962 SPC3_ALUA_EMULATED) ?
e3d6f909 2963 core_emulate_report_target_port_groups :
c66ac9db
NB		 2964 NULL;
2965 }
2966 size = (cdb[6] << 24) | (cdb[7] << 16) |
2967 (cdb[8] << 8) | cdb[9];
2968 } else {
2969 /* GPCMD_SEND_KEY from multi media commands */
2970 size = (cdb[8] << 8) + cdb[9];
2971 }
05d1c7c0 2972 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2973 break;
2974 case MODE_SELECT:
2975 size = cdb[4];
2976 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2977 break;
2978 case MODE_SELECT_10:
2979 size = (cdb[7] << 8) + cdb[8];
2980 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2981 break;
2982 case MODE_SENSE:
2983 size = cdb[4];
05d1c7c0 2984 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2985 break;
2986 case MODE_SENSE_10:
2987 case GPCMD_READ_BUFFER_CAPACITY:
2988 case GPCMD_SEND_OPC:
2989 case LOG_SELECT:
2990 case LOG_SENSE:
2991 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2992 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2993 break;
2994 case READ_BLOCK_LIMITS:
2995 size = READ_BLOCK_LEN;
05d1c7c0 2996 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2997 break;
2998 case GPCMD_GET_CONFIGURATION:
2999 case GPCMD_READ_FORMAT_CAPACITIES:
3000 case GPCMD_READ_DISC_INFO:
3001 case GPCMD_READ_TRACK_RZONE_INFO:
3002 size = (cdb[7] << 8) + cdb[8];
3003 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3004 break;
3005 case PERSISTENT_RESERVE_IN:
3006 case PERSISTENT_RESERVE_OUT:
3007 cmd->transport_emulate_cdb =
e3d6f909 3008 (su_dev->t10_pr.res_type ==
c66ac9db 3009 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3010 core_scsi3_emulate_pr : NULL;
c66ac9db 3011 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3012 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3013 break;
3014 case GPCMD_MECHANISM_STATUS:
3015 case GPCMD_READ_DVD_STRUCTURE:
3016 size = (cdb[8] << 8) + cdb[9];
3017 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3018 break;
3019 case READ_POSITION:
3020 size = READ_POSITION_LEN;
05d1c7c0 3021 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3022 break;
e434f1f1 3023 case MAINTENANCE_OUT:
e3d6f909 3024 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3025 /* MAINTENANCE_OUT from SCC-2
3026 *
3027 * Check for emulated MO_SET_TARGET_PGS.
3028 */
3029 if (cdb[1] == MO_SET_TARGET_PGS) {
3030 cmd->transport_emulate_cdb =
e3d6f909 3031 (su_dev->t10_alua.alua_type ==
c66ac9db 3032 SPC3_ALUA_EMULATED) ?
e3d6f909 3033 core_emulate_set_target_port_groups :
c66ac9db
NB		 3034 NULL;
3035 }
3036
3037 size = (cdb[6] << 24) | (cdb[7] << 16) |
3038 (cdb[8] << 8) | cdb[9];
3039 } else {
3040 /* GPCMD_REPORT_KEY from multi media commands */
3041 size = (cdb[8] << 8) + cdb[9];
3042 }
05d1c7c0 3043 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3044 break;
3045 case INQUIRY:
3046 size = (cdb[3] << 8) + cdb[4];
3047 /*
3048 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3049 * See spc4r17 section 5.3
3050 */
5951146d 3051 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3052 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3053 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3054 break;
3055 case READ_BUFFER:
3056 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3057 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3058 break;
3059 case READ_CAPACITY:
3060 size = READ_CAP_LEN;
05d1c7c0 3061 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3062 break;
3063 case READ_MEDIA_SERIAL_NUMBER:
3064 case SECURITY_PROTOCOL_IN:
3065 case SECURITY_PROTOCOL_OUT:
3066 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3067 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3068 break;
3069 case SERVICE_ACTION_IN:
3070 case ACCESS_CONTROL_IN:
3071 case ACCESS_CONTROL_OUT:
3072 case EXTENDED_COPY:
3073 case READ_ATTRIBUTE:
3074 case RECEIVE_COPY_RESULTS:
3075 case WRITE_ATTRIBUTE:
3076 size = (cdb[10] << 24) | (cdb[11] << 16) |
3077 (cdb[12] << 8) | cdb[13];
05d1c7c0 3078 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3079 break;
3080 case RECEIVE_DIAGNOSTIC:
3081 case SEND_DIAGNOSTIC:
3082 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3083 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3084 break;
3085/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3086#if 0
3087 case GPCMD_READ_CD:
3088 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3089 size = (2336 * sectors);
05d1c7c0 3090 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3091 break;
3092#endif
3093 case READ_TOC:
3094 size = cdb[8];
05d1c7c0 3095 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3096 break;
3097 case REQUEST_SENSE:
3098 size = cdb[4];
05d1c7c0 3099 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3100 break;
3101 case READ_ELEMENT_STATUS:
3102 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3103 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3104 break;
3105 case WRITE_BUFFER:
3106 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3107 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3108 break;
3109 case RESERVE:
3110 case RESERVE_10:
3111 /*
3112 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3113 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3114 */
3115 if (cdb[0] == RESERVE_10)
3116 size = (cdb[7] << 8) | cdb[8];
3117 else
3118 size = cmd->data_length;
3119
3120 /*
3121 * Setup the legacy emulated handler for SPC-2 and
3122 * >= SPC-3 compatible reservation handling (CRH=1)
3123 * Otherwise, we assume the underlying SCSI logic is
3124 * is running in SPC_PASSTHROUGH, and wants reservations
3125 * emulation disabled.
3126 */
3127 cmd->transport_emulate_cdb =
e3d6f909 3128 (su_dev->t10_pr.res_type !=
c66ac9db 3129 SPC_PASSTHROUGH) ?
e3d6f909 3130 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3131 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3132 break;
3133 case RELEASE:
3134 case RELEASE_10:
3135 /*
3136 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3137 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3138 */
3139 if (cdb[0] == RELEASE_10)
3140 size = (cdb[7] << 8) | cdb[8];
3141 else
3142 size = cmd->data_length;
3143
3144 cmd->transport_emulate_cdb =
e3d6f909 3145 (su_dev->t10_pr.res_type !=
c66ac9db 3146 SPC_PASSTHROUGH) ?
e3d6f909 3147 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3148 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3149 break;
3150 case SYNCHRONIZE_CACHE:
3151 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3152 /*
3153 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3154 */
3155 if (cdb[0] == SYNCHRONIZE_CACHE) {
3156 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3157 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3158 } else {
3159 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3160 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3161 }
3162 if (sector_ret)
3163 goto out_unsupported_cdb;
3164
3165 size = transport_get_size(sectors, cdb, cmd);
3166 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3167
3168 /*
3169 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3170 */
e3d6f909 3171 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3172 break;
3173 /*
3174 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3175 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3176 */
3177 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3178 /*
3179 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3180 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3181 */
7abbe7f3
NB		 3182 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3183 if (transport_cmd_get_valid_sectors(cmd) < 0)
3184 goto out_invalid_cdb_field;
3185 }
c66ac9db
NB		 3186 break;
3187 case UNMAP:
3188 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3189 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3190 break;
3191 case WRITE_SAME_16:
3192 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3193 if (sector_ret)
3194 goto out_unsupported_cdb;
dd3a5ad8 3195
6708bb27 3196 if (sectors)
12850626 3197 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3198 else {
3199 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3200 goto out_invalid_cdb_field;
3201 }
dd3a5ad8 3202
5db0753b 3203 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3204 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3205
3206 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3207 goto out_invalid_cdb_field;
3208 break;
3209 case WRITE_SAME:
3210 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3211 if (sector_ret)
3212 goto out_unsupported_cdb;
3213
3214 if (sectors)
12850626 3215 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3216 else {
3217 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3218 goto out_invalid_cdb_field;
c66ac9db 3219 }
706d5860
NB		 3220
3221 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3222 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3223 /*
3224 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3225 * of byte 1 bit 3 UNMAP instead of original reserved field
3226 */
3227 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3228 goto out_invalid_cdb_field;
c66ac9db
NB		 3229 break;
3230 case ALLOW_MEDIUM_REMOVAL:
3231 case GPCMD_CLOSE_TRACK:
3232 case ERASE:
3233 case INITIALIZE_ELEMENT_STATUS:
3234 case GPCMD_LOAD_UNLOAD:
3235 case REZERO_UNIT:
3236 case SEEK_10:
3237 case GPCMD_SET_SPEED:
3238 case SPACE:
3239 case START_STOP:
3240 case TEST_UNIT_READY:
3241 case VERIFY:
3242 case WRITE_FILEMARKS:
3243 case MOVE_MEDIUM:
3244 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3245 break;
3246 case REPORT_LUNS:
3247 cmd->transport_emulate_cdb =
e3d6f909 3248 transport_core_report_lun_response;
c66ac9db
NB		 3249 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3250 /*
3251 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3252 * See spc4r17 section 5.3
3253 */
5951146d 3254 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3255 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3256 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3257 break;
3258 default:
6708bb27 3259 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3260 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3261 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3262 goto out_unsupported_cdb;
3263 }
3264
3265 if (size != cmd->data_length) {
6708bb27 3266 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3267 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3268 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3269 cmd->data_length, size, cdb[0]);
3270
3271 cmd->cmd_spdtl = size;
3272
3273 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3274 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3275 " WRITE data\n");
3276 goto out_invalid_cdb_field;
3277 }
3278 /*
3279 * Reject READ_* or WRITE_* with overflow/underflow for
3280 * type SCF_SCSI_DATA_SG_IO_CDB.
3281 */
6708bb27
AG		 3282 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3283 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3284 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3285 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3286 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3287 goto out_invalid_cdb_field;
3288 }
3289
3290 if (size > cmd->data_length) {
3291 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3292 cmd->residual_count = (size - cmd->data_length);
3293 } else {
3294 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3295 cmd->residual_count = (cmd->data_length - size);
3296 }
3297 cmd->data_length = size;
3298 }
3299
d0229ae3
AG		 3300 /* Let's limit control cdbs to a page, for simplicity's sake. */
3301 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3302 size > PAGE_SIZE)
3303 goto out_invalid_cdb_field;
3304
c66ac9db
NB		 3305 transport_set_supported_SAM_opcode(cmd);
3306 return ret;
3307
3308out_unsupported_cdb:
3309 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3310 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3311 return -EINVAL;
c66ac9db
NB		 3312out_invalid_cdb_field:
3313 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3314 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3315 return -EINVAL;
c66ac9db
NB		 3316}
3317
c66ac9db
NB		 3318/*
3319 * Called from transport_generic_complete_ok() and
3320 * transport_generic_request_failure() to determine which dormant/delayed
3321 * and ordered cmds need to have their tasks added to the execution queue.
3322 */
3323static void transport_complete_task_attr(struct se_cmd *cmd)
3324{
5951146d 3325 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3326 struct se_cmd *cmd_p, *cmd_tmp;
3327 int new_active_tasks = 0;
3328
e66ecd50 3329 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3330 atomic_dec(&dev->simple_cmds);
3331 smp_mb__after_atomic_dec();
3332 dev->dev_cur_ordered_id++;
6708bb27 3333 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3334 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3335 cmd->se_ordered_id);
e66ecd50 3336 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3337 atomic_dec(&dev->dev_hoq_count);
3338 smp_mb__after_atomic_dec();
3339 dev->dev_cur_ordered_id++;
6708bb27 3340 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3341 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3342 cmd->se_ordered_id);
e66ecd50 3343 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3344 spin_lock(&dev->ordered_cmd_lock);
5951146d 3345 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3346 atomic_dec(&dev->dev_ordered_sync);
3347 smp_mb__after_atomic_dec();
3348 spin_unlock(&dev->ordered_cmd_lock);
3349
3350 dev->dev_cur_ordered_id++;
6708bb27 3351 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3352 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3353 }
3354 /*
3355 * Process all commands up to the last received
3356 * ORDERED task attribute which requires another blocking
3357 * boundary
3358 */
3359 spin_lock(&dev->delayed_cmd_lock);
3360 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3361 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3362
5951146d 3363 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3364 spin_unlock(&dev->delayed_cmd_lock);
3365
6708bb27 3366 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3367 " cmd_p: 0x%02x Task Attr: 0x%02x"
3368 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3369 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3370 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3371
3372 transport_add_tasks_from_cmd(cmd_p);
3373 new_active_tasks++;
3374
3375 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3376 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3377 break;
3378 }
3379 spin_unlock(&dev->delayed_cmd_lock);
3380 /*
3381 * If new tasks have become active, wake up the transport thread
3382 * to do the processing of the Active tasks.
3383 */
3384 if (new_active_tasks != 0)
e3d6f909 3385 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3386}
3387
e057f533 3388static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3389{
3390 int ret = 0;
3391
e057f533
CH		 3392 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3393 transport_complete_task_attr(cmd);
3394
3395 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3396 ret = cmd->se_tfo->queue_status(cmd);
3397 if (ret)
3398 goto out;
3399 }
07bde79a
NB		 3400
3401 switch (cmd->data_direction) {
3402 case DMA_FROM_DEVICE:
3403 ret = cmd->se_tfo->queue_data_in(cmd);
3404 break;
3405 case DMA_TO_DEVICE:
ec98f782 3406 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3407 ret = cmd->se_tfo->queue_data_in(cmd);
3408 if (ret < 0)
e057f533 3409 break;
07bde79a
NB		 3410 }
3411 /* Fall through for DMA_TO_DEVICE */
3412 case DMA_NONE:
3413 ret = cmd->se_tfo->queue_status(cmd);
3414 break;
3415 default:
3416 break;
3417 }
3418
e057f533
CH		 3419out:
3420 if (ret < 0) {
3421 transport_handle_queue_full(cmd, cmd->se_dev);
3422 return;
3423 }
3424 transport_lun_remove_cmd(cmd);
3425 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3426}
3427
3428static void transport_handle_queue_full(
3429 struct se_cmd *cmd,
e057f533 3430 struct se_device *dev)
07bde79a
NB		 3431{
3432 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3433 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3434 atomic_inc(&dev->dev_qf_count);
3435 smp_mb__after_atomic_inc();
3436 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3437
3438 schedule_work(&cmd->se_dev->qf_work_queue);
3439}
3440
c66ac9db
NB		 3441static void transport_generic_complete_ok(struct se_cmd *cmd)
3442{
07bde79a 3443 int reason = 0, ret;
c66ac9db
NB		 3444 /*
3445 * Check if we need to move delayed/dormant tasks from cmds on the
3446 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3447 * Attribute.
3448 */
5951146d 3449 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3450 transport_complete_task_attr(cmd);
07bde79a
NB		 3451 /*
3452 * Check to schedule QUEUE_FULL work, or execute an existing
3453 * cmd->transport_qf_callback()
3454 */
3455 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3456 schedule_work(&cmd->se_dev->qf_work_queue);
3457
c66ac9db
NB		 3458 /*
3459 * Check if we need to retrieve a sense buffer from
3460 * the struct se_cmd in question.
3461 */
3462 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3463 if (transport_get_sense_data(cmd) < 0)
3464 reason = TCM_NON_EXISTENT_LUN;
3465
3466 /*
3467 * Only set when an struct se_task->task_scsi_status returned
3468 * a non GOOD status.
3469 */
3470 if (cmd->scsi_status) {
07bde79a 3471 ret = transport_send_check_condition_and_sense(
c66ac9db 3472 cmd, reason, 1);
07bde79a
NB		 3473 if (ret == -EAGAIN)
3474 goto queue_full;
3475
c66ac9db
NB		 3476 transport_lun_remove_cmd(cmd);
3477 transport_cmd_check_stop_to_fabric(cmd);
3478 return;
3479 }
3480 }
3481 /*
25985edc 3482 * Check for a callback, used by amongst other things
c66ac9db
NB		 3483 * XDWRITE_READ_10 emulation.
3484 */
3485 if (cmd->transport_complete_callback)
3486 cmd->transport_complete_callback(cmd);
3487
3488 switch (cmd->data_direction) {
3489 case DMA_FROM_DEVICE:
3490 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3491 if (cmd->se_lun->lun_sep) {
3492 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3493 cmd->data_length;
3494 }
3495 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3496
07bde79a
NB		 3497 ret = cmd->se_tfo->queue_data_in(cmd);
3498 if (ret == -EAGAIN)
3499 goto queue_full;
c66ac9db
NB		 3500 break;
3501 case DMA_TO_DEVICE:
3502 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3503 if (cmd->se_lun->lun_sep) {
3504 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3505 cmd->data_length;
3506 }
3507 spin_unlock(&cmd->se_lun->lun_sep_lock);
3508 /*
3509 * Check if we need to send READ payload for BIDI-COMMAND
3510 */
ec98f782 3511 if (cmd->t_bidi_data_sg) {
c66ac9db 3512 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3513 if (cmd->se_lun->lun_sep) {
3514 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3515 cmd->data_length;
3516 }
3517 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3518 ret = cmd->se_tfo->queue_data_in(cmd);
3519 if (ret == -EAGAIN)
3520 goto queue_full;
c66ac9db
NB		 3521 break;
3522 }
3523 /* Fall through for DMA_TO_DEVICE */
3524 case DMA_NONE:
07bde79a
NB		 3525 ret = cmd->se_tfo->queue_status(cmd);
3526 if (ret == -EAGAIN)
3527 goto queue_full;
c66ac9db
NB		 3528 break;
3529 default:
3530 break;
3531 }
3532
3533 transport_lun_remove_cmd(cmd);
3534 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3535 return;
3536
3537queue_full:
6708bb27 3538 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3539 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3540 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3541 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3542}
3543
3544static void transport_free_dev_tasks(struct se_cmd *cmd)
3545{
3546 struct se_task *task, *task_tmp;
3547 unsigned long flags;
0c2cfe5f 3548 LIST_HEAD(dispose_list);
c66ac9db 3549
a1d8b49a 3550 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3551 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3552 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3553 if (!(task->task_flags & TF_ACTIVE))
3554 list_move_tail(&task->t_list, &dispose_list);
3555 }
3556 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3557
3558 while (!list_empty(&dispose_list)) {
3559 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3560
cc5d0f0f
CH		 3561 /*
3562 * We already cancelled all pending timers in
3563 * transport_complete_task, but that was just a pure del_timer,
3564 * so do a full del_timer_sync here to make sure any handler
3565 * that was running at that point has finished execution.
3566 */
3567 del_timer_sync(&task->task_timer);
3568
c66ac9db
NB		 3569 kfree(task->task_sg_bidi);
3570 kfree(task->task_sg);
3571
3572 list_del(&task->t_list);
3573
42bf829e 3574 cmd->se_dev->transport->free_task(task);
c66ac9db 3575 }
c66ac9db
NB		 3576}
3577
6708bb27 3578static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3579{
ec98f782 3580 struct scatterlist *sg;
ec98f782 3581 int count;
c66ac9db 3582
6708bb27
AG		 3583 for_each_sg(sgl, sg, nents, count)
3584 __free_page(sg_page(sg));
c66ac9db 3585
6708bb27
AG		 3586 kfree(sgl);
3587}
c66ac9db 3588
6708bb27
AG		 3589static inline void transport_free_pages(struct se_cmd *cmd)
3590{
3591 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3592 return;
3593
3594 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3595 cmd->t_data_sg = NULL;
3596 cmd->t_data_nents = 0;
c66ac9db 3597
6708bb27 3598 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3599 cmd->t_bidi_data_sg = NULL;
3600 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3601}
3602
d3df7825
CH		 3603/**
3604 * transport_put_cmd - release a reference to a command
3605 * @cmd: command to release
3606 *
3607 * This routine releases our reference to the command and frees it if possible.
3608 */
39c05f32 3609static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3610{
3611 unsigned long flags;
4911e3cc 3612 int free_tasks = 0;
c66ac9db 3613
a1d8b49a 3614 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3615 if (atomic_read(&cmd->t_fe_count)) {
3616 if (!atomic_dec_and_test(&cmd->t_fe_count))
3617 goto out_busy;
3618 }
3619
3620 if (atomic_read(&cmd->t_se_count)) {
3621 if (!atomic_dec_and_test(&cmd->t_se_count))
3622 goto out_busy;
3623 }
3624
3625 if (atomic_read(&cmd->transport_dev_active)) {
3626 atomic_set(&cmd->transport_dev_active, 0);
3627 transport_all_task_dev_remove_state(cmd);
3628 free_tasks = 1;
c66ac9db 3629 }
a1d8b49a 3630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3631
4911e3cc
CH		 3632 if (free_tasks != 0)
3633 transport_free_dev_tasks(cmd);
d3df7825 3634
c66ac9db 3635 transport_free_pages(cmd);
31afc39c 3636 transport_release_cmd(cmd);
39c05f32 3637 return;
4911e3cc
CH		 3638out_busy:
3639 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3640}
3641
c66ac9db 3642/*
ec98f782
AG		 3643 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3644 * allocating in the core.
c66ac9db
NB		 3645 * @cmd: Associated se_cmd descriptor
3646 * @mem: SGL style memory for TCM WRITE / READ
3647 * @sg_mem_num: Number of SGL elements
3648 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3649 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3650 *
3651 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3652 * of parameters.
3653 */
3654int transport_generic_map_mem_to_cmd(
3655 struct se_cmd *cmd,
5951146d
AG		 3656 struct scatterlist *sgl,
3657 u32 sgl_count,
3658 struct scatterlist *sgl_bidi,
3659 u32 sgl_bidi_count)
c66ac9db 3660{
5951146d 3661 if (!sgl || !sgl_count)
c66ac9db 3662 return 0;
c66ac9db 3663
c66ac9db
NB		 3664 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3665 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3666
ec98f782
AG		 3667 cmd->t_data_sg = sgl;
3668 cmd->t_data_nents = sgl_count;
c66ac9db 3669
ec98f782
AG		 3670 if (sgl_bidi && sgl_bidi_count) {
3671 cmd->t_bidi_data_sg = sgl_bidi;
3672 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3673 }
3674 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3675 }
3676
3677 return 0;
3678}
3679EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3680
c66ac9db
NB		 3681static int transport_new_cmd_obj(struct se_cmd *cmd)
3682{
5951146d 3683 struct se_device *dev = cmd->se_dev;
01cde4d5 3684 int set_counts = 1, rc, task_cdbs;
c66ac9db 3685
ec98f782
AG		 3686 /*
3687 * Setup any BIDI READ tasks and memory from
3688 * cmd->t_mem_bidi_list so the READ struct se_tasks
3689 * are queued first for the non pSCSI passthrough case.
3690 */
3691 if (cmd->t_bidi_data_sg &&
3692 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3693 rc = transport_allocate_tasks(cmd,
3694 cmd->t_task_lba,
3695 DMA_FROM_DEVICE,
3696 cmd->t_bidi_data_sg,
3697 cmd->t_bidi_data_nents);
6708bb27 3698 if (rc <= 0) {
c66ac9db
NB		 3699 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3700 cmd->scsi_sense_reason =
ec98f782 3701 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3702 return -EINVAL;
c66ac9db 3703 }
ec98f782
AG		 3704 atomic_inc(&cmd->t_fe_count);
3705 atomic_inc(&cmd->t_se_count);
3706 set_counts = 0;
3707 }
3708 /*
3709 * Setup the tasks and memory from cmd->t_mem_list
3710 * Note for BIDI transfers this will contain the WRITE payload
3711 */
3712 task_cdbs = transport_allocate_tasks(cmd,
3713 cmd->t_task_lba,
3714 cmd->data_direction,
3715 cmd->t_data_sg,
3716 cmd->t_data_nents);
6708bb27 3717 if (task_cdbs <= 0) {
ec98f782
AG		 3718 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3719 cmd->scsi_sense_reason =
3720 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3721 return -EINVAL;
ec98f782 3722 }
c66ac9db 3723
ec98f782
AG		 3724 if (set_counts) {
3725 atomic_inc(&cmd->t_fe_count);
3726 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 3727 }
3728
ec98f782
AG		 3729 cmd->t_task_list_num = task_cdbs;
3730
a1d8b49a
AG		 3731 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3732 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3733 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 3734 return 0;
3735}
3736
05d1c7c0
AG		 3737void *transport_kmap_first_data_page(struct se_cmd *cmd)
3738{
ec98f782 3739 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3740
ec98f782 3741 BUG_ON(!sg);
05d1c7c0 3742 /*
ec98f782
AG		 3743 * We need to take into account a possible offset here for fabrics like
3744 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3745 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3746 */
ec98f782 3747 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3748}
3749EXPORT_SYMBOL(transport_kmap_first_data_page);
3750
3751void transport_kunmap_first_data_page(struct se_cmd *cmd)
3752{
ec98f782 3753 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3754}
3755EXPORT_SYMBOL(transport_kunmap_first_data_page);
3756
c66ac9db 3757static int
05d1c7c0 3758transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3759{
ec98f782
AG		 3760 u32 length = cmd->data_length;
3761 unsigned int nents;
3762 struct page *page;
3763 int i = 0;
c66ac9db 3764
ec98f782
AG		 3765 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3766 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3767 if (!cmd->t_data_sg)
3768 return -ENOMEM;
c66ac9db 3769
ec98f782
AG		 3770 cmd->t_data_nents = nents;
3771 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3772
ec98f782
AG		 3773 while (length) {
3774 u32 page_len = min_t(u32, length, PAGE_SIZE);
3775 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3776 if (!page)
3777 goto out;
c66ac9db 3778
ec98f782
AG		 3779 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3780 length -= page_len;
3781 i++;
c66ac9db 3782 }
c66ac9db 3783 return 0;
c66ac9db 3784
ec98f782
AG		 3785out:
3786 while (i >= 0) {
3787 __free_page(sg_page(&cmd->t_data_sg[i]));
3788 i--;
c66ac9db 3789 }
ec98f782
AG		 3790 kfree(cmd->t_data_sg);
3791 cmd->t_data_sg = NULL;
3792 return -ENOMEM;
c66ac9db
NB		 3793}
3794
a1d8b49a
AG		 3795/* Reduce sectors if they are too long for the device */
3796static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3797 struct se_device *dev,
3798 unsigned long long lba,
a1d8b49a 3799 sector_t sectors)
c66ac9db 3800{
a1d8b49a 3801 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3802
a1d8b49a
AG		 3803 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3804 if ((lba + sectors) > transport_dev_end_lba(dev))
3805 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3806
a1d8b49a 3807 return sectors;
c66ac9db
NB		 3808}
3809
c66ac9db
NB		 3810
3811/*
3812 * This function can be used by HW target mode drivers to create a linked
3813 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3814 * This is intended to be called during the completion path by TCM Core
3815 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3816 */
3817void transport_do_task_sg_chain(struct se_cmd *cmd)
3818{
ec98f782
AG		 3819 struct scatterlist *sg_first = NULL;
3820 struct scatterlist *sg_prev = NULL;
3821 int sg_prev_nents = 0;
3822 struct scatterlist *sg;
c66ac9db 3823 struct se_task *task;
ec98f782 3824 u32 chained_nents = 0;
c66ac9db
NB		 3825 int i;
3826
ec98f782
AG		 3827 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3828
c66ac9db
NB		 3829 /*
3830 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3831 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3832 */
a1d8b49a 3833 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3834 if (!task->task_sg)
c66ac9db
NB		 3835 continue;
3836
ec98f782
AG		 3837 if (!sg_first) {
3838 sg_first = task->task_sg;
6708bb27 3839 chained_nents = task->task_sg_nents;
97868c89 3840 } else {
ec98f782 3841 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3842 chained_nents += task->task_sg_nents;
97868c89 3843 }
c3c74c7a
NB		 3844 /*
3845 * For the padded tasks, use the extra SGL vector allocated
3846 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3847 * offset into sg_chain() above.
3848 *
3849 * We do not need the padding for the last task (or a single
3850 * task), but in that case we will never use the sg_prev_nents
3851 * value below which would be incorrect.
c3c74c7a 3852 */
04629b7b 3853 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3854 sg_prev = task->task_sg;
c66ac9db
NB		 3855 }
3856 /*
3857 * Setup the starting pointer and total t_tasks_sg_linked_no including
3858 * padding SGs for linking and to mark the end.
3859 */
a1d8b49a 3860 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3861 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3862
6708bb27 3863 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3864 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3865 cmd->t_tasks_sg_chained_no);
c66ac9db 3866
a1d8b49a
AG		 3867 for_each_sg(cmd->t_tasks_sg_chained, sg,
3868 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3869
6708bb27 3870 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3871 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3872 if (sg_is_chain(sg))
6708bb27 3873 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3874 if (sg_is_last(sg))
6708bb27 3875 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3876 }
c66ac9db
NB		 3877}
3878EXPORT_SYMBOL(transport_do_task_sg_chain);
3879
a1d8b49a
AG		 3880/*
3881 * Break up cmd into chunks transport can handle
3882 */
ec98f782 3883static int transport_allocate_data_tasks(
c66ac9db
NB		 3884 struct se_cmd *cmd,
3885 unsigned long long lba,
c66ac9db 3886 enum dma_data_direction data_direction,
ec98f782
AG		 3887 struct scatterlist *sgl,
3888 unsigned int sgl_nents)
c66ac9db 3889{
c66ac9db 3890 struct se_task *task;
5951146d 3891 struct se_device *dev = cmd->se_dev;
ec98f782 3892 unsigned long flags;
a3eedc22 3893 int task_count, i;
277c5f27 3894 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
ec98f782
AG		 3895 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3896 struct scatterlist *sg;
3897 struct scatterlist *cmd_sg;
a1d8b49a 3898
ec98f782
AG		 3899 WARN_ON(cmd->data_length % sector_size);
3900 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27
NB		 3901 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3902
ec98f782
AG		 3903 cmd_sg = sgl;
3904 for (i = 0; i < task_count; i++) {
c3c74c7a 3905 unsigned int task_size, task_sg_nents_padded;
ec98f782 3906 int count;
a1d8b49a 3907
c66ac9db 3908 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3909 if (!task)
ec98f782 3910 return -ENOMEM;
c66ac9db 3911
c66ac9db 3912 task->task_lba = lba;
ec98f782
AG		 3913 task->task_sectors = min(sectors, dev_max_sectors);
3914 task->task_size = task->task_sectors * sector_size;
c66ac9db 3915
525a48a2
NB		 3916 /*
3917 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3918 * in order to calculate the number per task SGL entries
3919 */
3920 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3921 /*
ec98f782
AG		 3922 * Check if the fabric module driver is requesting that all
3923 * struct se_task->task_sg[] be chained together.. If so,
3924 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3925 * marking the end of the chained SGL for every task except
3926 * the last one for (task_count > 1) operation, or skipping
3927 * the extra padding for the (task_count == 1) case.
c66ac9db 3928 */
c3c74c7a
NB		 3929 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3930 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3931 } else
3932 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3933
1d20bb61 3934 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3935 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3936 if (!task->task_sg) {
3937 cmd->se_dev->transport->free_task(task);
3938 return -ENOMEM;
3939 }
3940
c3c74c7a 3941 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3942
ec98f782
AG		 3943 task_size = task->task_size;
3944
3945 /* Build new sgl, only up to task_size */
6708bb27 3946 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3947 if (cmd_sg->length > task_size)
3948 break;
3949
3950 *sg = *cmd_sg;
3951 task_size -= cmd_sg->length;
3952 cmd_sg = sg_next(cmd_sg);
c66ac9db 3953 }
c66ac9db 3954
ec98f782
AG		 3955 lba += task->task_sectors;
3956 sectors -= task->task_sectors;
c66ac9db 3957
ec98f782
AG		 3958 spin_lock_irqsave(&cmd->t_state_lock, flags);
3959 list_add_tail(&task->t_list, &cmd->t_task_list);
3960 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3961 }
3962
ec98f782 3963 return task_count;
c66ac9db
NB		 3964}
3965
3966static int
ec98f782 3967transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3968{
c66ac9db 3969 struct se_task *task;
ec98f782 3970 unsigned long flags;
c66ac9db
NB		 3971
3972 task = transport_generic_get_task(cmd, cmd->data_direction);
3973 if (!task)
ec98f782 3974 return -ENOMEM;
c66ac9db 3975
ec98f782
AG		 3976 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
3977 GFP_KERNEL);
3978 if (!task->task_sg) {
3979 cmd->se_dev->transport->free_task(task);
3980 return -ENOMEM;
3981 }
3982
3983 memcpy(task->task_sg, cmd->t_data_sg,
3984 sizeof(struct scatterlist) * cmd->t_data_nents);
c66ac9db 3985 task->task_size = cmd->data_length;
6708bb27 3986 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3987
ec98f782
AG		 3988 spin_lock_irqsave(&cmd->t_state_lock, flags);
3989 list_add_tail(&task->t_list, &cmd->t_task_list);
3990 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3991
6708bb27 3992 /* Success! Return number of tasks allocated */
a3eedc22 3993 return 1;
ec98f782
AG		 3994}
3995
3996static u32 transport_allocate_tasks(
3997 struct se_cmd *cmd,
3998 unsigned long long lba,
3999 enum dma_data_direction data_direction,
4000 struct scatterlist *sgl,
4001 unsigned int sgl_nents)
4002{
01cde4d5
NB		 4003 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4004 if (transport_cmd_get_valid_sectors(cmd) < 0)
4005 return -EINVAL;
4006
ec98f782
AG		 4007 return transport_allocate_data_tasks(cmd, lba, data_direction,
4008 sgl, sgl_nents);
01cde4d5 4009 } else
6708bb27
AG		 4010 return transport_allocate_control_task(cmd);
4011
c66ac9db
NB		 4012}
4013
ec98f782 4014
c66ac9db
NB		 4015/* transport_generic_new_cmd(): Called from transport_processing_thread()
4016 *
4017 * Allocate storage transport resources from a set of values predefined
4018 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4019 * Any non zero return here is treated as an "out of resource' op here.
4020 */
4021 /*
4022 * Generate struct se_task(s) and/or their payloads for this CDB.
4023 */
a1d8b49a 4024int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4025{
c66ac9db
NB		 4026 int ret = 0;
4027
4028 /*
4029 * Determine is the TCM fabric module has already allocated physical
4030 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 4031 * beforehand.
c66ac9db 4032 */
ec98f782
AG		 4033 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4034 cmd->data_length) {
05d1c7c0 4035 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4036 if (ret < 0)
4037 return ret;
4038 }
1d20bb61
NB		 4039 /*
4040 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4041 * control or data CDB types, and perform the map to backend subsystem
4042 * code from SGL memory allocated here by transport_generic_get_mem(), or
4043 * via pre-existing SGL memory setup explictly by fabric module code with
4044 * transport_generic_map_mem_to_cmd().
4045 */
c66ac9db
NB		 4046 ret = transport_new_cmd_obj(cmd);
4047 if (ret < 0)
4048 return ret;
c66ac9db 4049 /*
a1d8b49a 4050 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4051 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4052 * will be added to the struct se_device execution queue after its WRITE
4053 * data has arrived. (ie: It gets handled by the transport processing
4054 * thread a second time)
4055 */
4056 if (cmd->data_direction == DMA_TO_DEVICE) {
4057 transport_add_tasks_to_state_queue(cmd);
4058 return transport_generic_write_pending(cmd);
4059 }
4060 /*
4061 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4062 * to the execution queue.
4063 */
4064 transport_execute_tasks(cmd);
4065 return 0;
4066}
a1d8b49a 4067EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4068
4069/* transport_generic_process_write():
4070 *
4071 *
4072 */
4073void transport_generic_process_write(struct se_cmd *cmd)
4074{
c66ac9db
NB		 4075 transport_execute_tasks(cmd);
4076}
4077EXPORT_SYMBOL(transport_generic_process_write);
4078
e057f533 4079static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 4080{
e057f533
CH		 4081 if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
4082 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4083 cmd);
4084 transport_handle_queue_full(cmd, cmd->se_dev);
4085 }
07bde79a
NB		 4086}
4087
c66ac9db
NB		 4088static int transport_generic_write_pending(struct se_cmd *cmd)
4089{
4090 unsigned long flags;
4091 int ret;
4092
a1d8b49a 4093 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4094 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4095 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 4096
c66ac9db
NB		 4097 /*
4098 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4099 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4100 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4101 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4102 * because the se_cmd->se_lun pointer is not being cleared.
4103 */
4104 transport_cmd_check_stop(cmd, 1, 0);
4105
4106 /*
4107 * Call the fabric write_pending function here to let the
4108 * frontend know that WRITE buffers are ready.
4109 */
e3d6f909 4110 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 4111 if (ret == -EAGAIN)
4112 goto queue_full;
4113 else if (ret < 0)
c66ac9db
NB		 4114 return ret;
4115
4116 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 4117
4118queue_full:
6708bb27 4119 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 4120 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 4121 transport_handle_queue_full(cmd, cmd->se_dev);
07bde79a 4122 return ret;
c66ac9db
NB		 4123}
4124
2dbc43d2
CH		 4125/**
4126 * transport_release_cmd - free a command
4127 * @cmd: command to free
4128 *
4129 * This routine unconditionally frees a command, and reference counting
4130 * or list removal must be done in the caller.
4131 */
35462975 4132void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4133{
e3d6f909 4134 BUG_ON(!cmd->se_tfo);
c66ac9db 4135
2dbc43d2
CH		 4136 if (cmd->se_tmr_req)
4137 core_tmr_release_req(cmd->se_tmr_req);
4138 if (cmd->t_task_cdb != cmd->__t_task_cdb)
4139 kfree(cmd->t_task_cdb);
35462975 4140 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4141}
35462975 4142EXPORT_SYMBOL(transport_release_cmd);
c66ac9db 4143
39c05f32 4144void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 4145{
d14921d6
NB		 4146 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
4147 if (wait_for_tasks && cmd->se_tmr_req)
4148 transport_wait_for_tasks(cmd);
4149
35462975 4150 transport_release_cmd(cmd);
d14921d6
NB		 4151 } else {
4152 if (wait_for_tasks)
4153 transport_wait_for_tasks(cmd);
4154
c66ac9db
NB		 4155 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4156
82f1c8a4 4157 if (cmd->se_lun)
c66ac9db 4158 transport_lun_remove_cmd(cmd);
c66ac9db 4159
f4366772
NB		 4160 transport_free_dev_tasks(cmd);
4161
39c05f32 4162 transport_put_cmd(cmd);
c66ac9db
NB		 4163 }
4164}
4165EXPORT_SYMBOL(transport_generic_free_cmd);
4166
c66ac9db
NB		 4167/* transport_lun_wait_for_tasks():
4168 *
4169 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4170 * an struct se_lun to be successfully shutdown.
4171 */
4172static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4173{
4174 unsigned long flags;
4175 int ret;
4176 /*
4177 * If the frontend has already requested this struct se_cmd to
4178 * be stopped, we can safely ignore this struct se_cmd.
4179 */
a1d8b49a
AG		 4180 spin_lock_irqsave(&cmd->t_state_lock, flags);
4181 if (atomic_read(&cmd->t_transport_stop)) {
4182 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4183 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4184 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4185 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4186 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4187 return -EPERM;
c66ac9db 4188 }
a1d8b49a
AG		 4189 atomic_set(&cmd->transport_lun_fe_stop, 1);
4190 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4191
5951146d 4192 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4193
4194 ret = transport_stop_tasks_for_cmd(cmd);
4195
6708bb27
AG		 4196 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4197 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4198 if (!ret) {
6708bb27 4199 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4200 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4201 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4202 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4203 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4204 }
3df8d40b 4205 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4206
4207 return 0;
4208}
4209
c66ac9db
NB		 4210static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4211{
4212 struct se_cmd *cmd = NULL;
4213 unsigned long lun_flags, cmd_flags;
4214 /*
4215 * Do exception processing and return CHECK_CONDITION status to the
4216 * Initiator Port.
4217 */
4218 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4219 while (!list_empty(&lun->lun_cmd_list)) {
4220 cmd = list_first_entry(&lun->lun_cmd_list,
4221 struct se_cmd, se_lun_node);
4222 list_del(&cmd->se_lun_node);
4223
a1d8b49a 4224 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4225 /*
4226 * This will notify iscsi_target_transport.c:
4227 * transport_cmd_check_stop() that a LUN shutdown is in
4228 * progress for the iscsi_cmd_t.
4229 */
a1d8b49a 4230 spin_lock(&cmd->t_state_lock);
6708bb27 4231 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4232 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4233 cmd->se_lun->unpacked_lun,
4234 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4235 atomic_set(&cmd->transport_lun_stop, 1);
4236 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4237
4238 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4239
6708bb27
AG		 4240 if (!cmd->se_lun) {
4241 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4242 cmd->se_tfo->get_task_tag(cmd),
4243 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4244 BUG();
4245 }
4246 /*
4247 * If the Storage engine still owns the iscsi_cmd_t, determine
4248 * and/or stop its context.
4249 */
6708bb27 4250 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4251 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4252 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4253
e3d6f909 4254 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4255 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4256 continue;
4257 }
4258
6708bb27 4259 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4260 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4261 cmd->se_lun->unpacked_lun,
4262 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4263
a1d8b49a 4264 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4265 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4266 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4267 goto check_cond;
4268 }
a1d8b49a 4269 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4270 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4271 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4272
4273 transport_free_dev_tasks(cmd);
4274 /*
4275 * The Storage engine stopped this struct se_cmd before it was
4276 * send to the fabric frontend for delivery back to the
4277 * Initiator Node. Return this SCSI CDB back with an
4278 * CHECK_CONDITION status.
4279 */
4280check_cond:
4281 transport_send_check_condition_and_sense(cmd,
4282 TCM_NON_EXISTENT_LUN, 0);
4283 /*
4284 * If the fabric frontend is waiting for this iscsi_cmd_t to
4285 * be released, notify the waiting thread now that LU has
4286 * finished accessing it.
4287 */
a1d8b49a
AG		 4288 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4289 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4290 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4291 " struct se_cmd: %p ITT: 0x%08x\n",
4292 lun->unpacked_lun,
e3d6f909 4293 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4294
a1d8b49a 4295 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4296 cmd_flags);
4297 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4298 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4299 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4300 continue;
4301 }
6708bb27 4302 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4303 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4304
a1d8b49a 4305 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4306 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4307 }
4308 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4309}
4310
4311static int transport_clear_lun_thread(void *p)
4312{
4313 struct se_lun *lun = (struct se_lun *)p;
4314
4315 __transport_clear_lun_from_sessions(lun);
4316 complete(&lun->lun_shutdown_comp);
4317
4318 return 0;
4319}
4320
4321int transport_clear_lun_from_sessions(struct se_lun *lun)
4322{
4323 struct task_struct *kt;
4324
5951146d 4325 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4326 "tcm_cl_%u", lun->unpacked_lun);
4327 if (IS_ERR(kt)) {
6708bb27 4328 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4329 return PTR_ERR(kt);
c66ac9db
NB		 4330 }
4331 wait_for_completion(&lun->lun_shutdown_comp);
4332
4333 return 0;
4334}
4335
d14921d6
NB		 4336/**
4337 * transport_wait_for_tasks - wait for completion to occur
4338 * @cmd: command to wait
c66ac9db 4339 *
d14921d6
NB		 4340 * Called from frontend fabric context to wait for storage engine
4341 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4342 */
d14921d6 4343void transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4344{
4345 unsigned long flags;
4346
a1d8b49a 4347 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4348 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4349 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4350 return;
4351 }
4352 /*
4353 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4354 * has been set in transport_set_supported_SAM_opcode().
4355 */
4356 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4357 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4358 return;
4359 }
c66ac9db
NB		 4360 /*
4361 * If we are already stopped due to an external event (ie: LUN shutdown)
4362 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4363 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4364 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4365 * has completed its operation on the struct se_cmd.
4366 */
a1d8b49a 4367 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4368
6708bb27 4369 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4370 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4371 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4372 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4373 /*
4374 * There is a special case for WRITES where a FE exception +
4375 * LUN shutdown means ConfigFS context is still sleeping on
4376 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4377 * We go ahead and up transport_lun_stop_comp just to be sure
4378 * here.
4379 */
a1d8b49a
AG		 4380 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4381 complete(&cmd->transport_lun_stop_comp);
4382 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4383 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4384
4385 transport_all_task_dev_remove_state(cmd);
4386 /*
4387 * At this point, the frontend who was the originator of this
4388 * struct se_cmd, now owns the structure and can be released through
4389 * normal means below.
4390 */
6708bb27 4391 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4392 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4393 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4394 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4395
a1d8b49a 4396 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4397 }
a1d8b49a 4398 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4399 atomic_read(&cmd->t_transport_aborted)) {
4400 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4401 return;
4402 }
c66ac9db 4403
a1d8b49a 4404 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4405
6708bb27 4406 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
c66ac9db 4407 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
e3d6f909
AG		 4408 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4409 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
c66ac9db
NB		 4410 cmd->deferred_t_state);
4411
a1d8b49a 4412 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4413
5951146d 4414 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4415
a1d8b49a 4416 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4417
a1d8b49a
AG		 4418 spin_lock_irqsave(&cmd->t_state_lock, flags);
4419 atomic_set(&cmd->t_transport_active, 0);
4420 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4421
6708bb27 4422 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4423 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4424 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4425
d14921d6 4426 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4427}
d14921d6 4428EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4429
4430static int transport_get_sense_codes(
4431 struct se_cmd *cmd,
4432 u8 *asc,
4433 u8 *ascq)
4434{
4435 *asc = cmd->scsi_asc;
4436 *ascq = cmd->scsi_ascq;
4437
4438 return 0;
4439}
4440
4441static int transport_set_sense_codes(
4442 struct se_cmd *cmd,
4443 u8 asc,
4444 u8 ascq)
4445{
4446 cmd->scsi_asc = asc;
4447 cmd->scsi_ascq = ascq;
4448
4449 return 0;
4450}
4451
4452int transport_send_check_condition_and_sense(
4453 struct se_cmd *cmd,
4454 u8 reason,
4455 int from_transport)
4456{
4457 unsigned char *buffer = cmd->sense_buffer;
4458 unsigned long flags;
4459 int offset;
4460 u8 asc = 0, ascq = 0;
4461
a1d8b49a 4462 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4463 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4464 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4465 return 0;
4466 }
4467 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4468 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4469
4470 if (!reason && from_transport)
4471 goto after_reason;
4472
4473 if (!from_transport)
4474 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4475 /*
4476 * Data Segment and SenseLength of the fabric response PDU.
4477 *
4478 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4479 * from include/scsi/scsi_cmnd.h
4480 */
e3d6f909 4481 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4482 TRANSPORT_SENSE_BUFFER);
4483 /*
4484 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4485 * SENSE KEY values from include/scsi/scsi.h
4486 */
4487 switch (reason) {
4488 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4489 /* CURRENT ERROR */
4490 buffer[offset] = 0x70;
4491 /* ILLEGAL REQUEST */
4492 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4493 /* LOGICAL UNIT NOT SUPPORTED */
4494 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4495 break;
c66ac9db
NB		 4496 case TCM_UNSUPPORTED_SCSI_OPCODE:
4497 case TCM_SECTOR_COUNT_TOO_MANY:
4498 /* CURRENT ERROR */
4499 buffer[offset] = 0x70;
4500 /* ILLEGAL REQUEST */
4501 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4502 /* INVALID COMMAND OPERATION CODE */
4503 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4504 break;
4505 case TCM_UNKNOWN_MODE_PAGE:
4506 /* CURRENT ERROR */
4507 buffer[offset] = 0x70;
4508 /* ILLEGAL REQUEST */
4509 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4510 /* INVALID FIELD IN CDB */
4511 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4512 break;
4513 case TCM_CHECK_CONDITION_ABORT_CMD:
4514 /* CURRENT ERROR */
4515 buffer[offset] = 0x70;
4516 /* ABORTED COMMAND */
4517 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4518 /* BUS DEVICE RESET FUNCTION OCCURRED */
4519 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4520 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4521 break;
4522 case TCM_INCORRECT_AMOUNT_OF_DATA:
4523 /* CURRENT ERROR */
4524 buffer[offset] = 0x70;
4525 /* ABORTED COMMAND */
4526 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4527 /* WRITE ERROR */
4528 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4529 /* NOT ENOUGH UNSOLICITED DATA */
4530 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4531 break;
4532 case TCM_INVALID_CDB_FIELD:
4533 /* CURRENT ERROR */
4534 buffer[offset] = 0x70;
4535 /* ABORTED COMMAND */
4536 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4537 /* INVALID FIELD IN CDB */
4538 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4539 break;
4540 case TCM_INVALID_PARAMETER_LIST:
4541 /* CURRENT ERROR */
4542 buffer[offset] = 0x70;
4543 /* ABORTED COMMAND */
4544 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4545 /* INVALID FIELD IN PARAMETER LIST */
4546 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4547 break;
4548 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4549 /* CURRENT ERROR */
4550 buffer[offset] = 0x70;
4551 /* ABORTED COMMAND */
4552 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4553 /* WRITE ERROR */
4554 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4555 /* UNEXPECTED_UNSOLICITED_DATA */
4556 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4557 break;
4558 case TCM_SERVICE_CRC_ERROR:
4559 /* CURRENT ERROR */
4560 buffer[offset] = 0x70;
4561 /* ABORTED COMMAND */
4562 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4563 /* PROTOCOL SERVICE CRC ERROR */
4564 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4565 /* N/A */
4566 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4567 break;
4568 case TCM_SNACK_REJECTED:
4569 /* CURRENT ERROR */
4570 buffer[offset] = 0x70;
4571 /* ABORTED COMMAND */
4572 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4573 /* READ ERROR */
4574 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4575 /* FAILED RETRANSMISSION REQUEST */
4576 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4577 break;
4578 case TCM_WRITE_PROTECTED:
4579 /* CURRENT ERROR */
4580 buffer[offset] = 0x70;
4581 /* DATA PROTECT */
4582 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4583 /* WRITE PROTECTED */
4584 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4585 break;
4586 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4587 /* CURRENT ERROR */
4588 buffer[offset] = 0x70;
4589 /* UNIT ATTENTION */
4590 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4591 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4592 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4593 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4594 break;
4595 case TCM_CHECK_CONDITION_NOT_READY:
4596 /* CURRENT ERROR */
4597 buffer[offset] = 0x70;
4598 /* Not Ready */
4599 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4600 transport_get_sense_codes(cmd, &asc, &ascq);
4601 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4602 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4603 break;
4604 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4605 default:
4606 /* CURRENT ERROR */
4607 buffer[offset] = 0x70;
4608 /* ILLEGAL REQUEST */
4609 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4610 /* LOGICAL UNIT COMMUNICATION FAILURE */
4611 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4612 break;
4613 }
4614 /*
4615 * This code uses linux/include/scsi/scsi.h SAM status codes!
4616 */
4617 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4618 /*
4619 * Automatically padded, this value is encoded in the fabric's
4620 * data_length response PDU containing the SCSI defined sense data.
4621 */
4622 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4623
4624after_reason:
07bde79a 4625 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4626}
4627EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4628
4629int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4630{
4631 int ret = 0;
4632
a1d8b49a 4633 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4634 if (!send_status ||
c66ac9db
NB		 4635 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4636 return 1;
4637#if 0
6708bb27 4638 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4639 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4640 cmd->t_task_cdb[0],
e3d6f909 4641 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4642#endif
4643 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4644 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4645 ret = 1;
4646 }
4647 return ret;
4648}
4649EXPORT_SYMBOL(transport_check_aborted_status);
4650
4651void transport_send_task_abort(struct se_cmd *cmd)
4652{
c252f003
NB		 4653 unsigned long flags;
4654
4655 spin_lock_irqsave(&cmd->t_state_lock, flags);
4656 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4657 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4658 return;
4659 }
4660 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4661
c66ac9db
NB		 4662 /*
4663 * If there are still expected incoming fabric WRITEs, we wait
4664 * until until they have completed before sending a TASK_ABORTED
4665 * response. This response with TASK_ABORTED status will be
4666 * queued back to fabric module by transport_check_aborted_status().
4667 */
4668 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4669 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4670 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4671 smp_mb__after_atomic_inc();
4672 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4673 transport_new_cmd_failure(cmd);
4674 return;
4675 }
4676 }
4677 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4678#if 0
6708bb27 4679 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4680 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4681 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4682#endif
e3d6f909 4683 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4684}
4685
4686/* transport_generic_do_tmr():
4687 *
4688 *
4689 */
4690int transport_generic_do_tmr(struct se_cmd *cmd)
4691{
5951146d 4692 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4693 struct se_tmr_req *tmr = cmd->se_tmr_req;
4694 int ret;
4695
4696 switch (tmr->function) {
5c6cd613 4697 case TMR_ABORT_TASK:
c66ac9db
NB		 4698 tmr->response = TMR_FUNCTION_REJECTED;
4699 break;
5c6cd613
NB		 4700 case TMR_ABORT_TASK_SET:
4701 case TMR_CLEAR_ACA:
4702 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4703 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4704 break;
5c6cd613 4705 case TMR_LUN_RESET:
c66ac9db
NB		 4706 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4707 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4708 TMR_FUNCTION_REJECTED;
4709 break;
5c6cd613 4710 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4711 tmr->response = TMR_FUNCTION_REJECTED;
4712 break;
5c6cd613 4713 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4714 tmr->response = TMR_FUNCTION_REJECTED;
4715 break;
c66ac9db 4716 default:
6708bb27 4717 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4718 tmr->function);
4719 tmr->response = TMR_FUNCTION_REJECTED;
4720 break;
4721 }
4722
4723 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4724 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4725
b7b8bef7 4726 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4727 return 0;
4728}
4729
c66ac9db
NB		 4730/* transport_processing_thread():
4731 *
4732 *
4733 */
4734static int transport_processing_thread(void *param)
4735{
5951146d 4736 int ret;
c66ac9db
NB		 4737 struct se_cmd *cmd;
4738 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 4739
4740 set_user_nice(current, -20);
4741
4742 while (!kthread_should_stop()) {
e3d6f909
AG		 4743 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4744 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4745 kthread_should_stop());
4746 if (ret < 0)
4747 goto out;
4748
c66ac9db
NB		 4749get_cmd:
4750 __transport_execute_tasks(dev);
4751
5951146d
AG		 4752 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4753 if (!cmd)
c66ac9db
NB		 4754 continue;
4755
5951146d 4756 switch (cmd->t_state) {
680b73c5
CH		 4757 case TRANSPORT_NEW_CMD:
4758 BUG();
4759 break;
c66ac9db 4760 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4761 if (!cmd->se_tfo->new_cmd_map) {
4762 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4763 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4764 BUG();
4765 }
e3d6f909 4766 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 4767 if (ret < 0) {
4768 cmd->transport_error_status = ret;
4499dda8 4769 transport_generic_request_failure(cmd,
c66ac9db
NB		 4770 0, (cmd->data_direction !=
4771 DMA_TO_DEVICE));
4772 break;
4773 }
c66ac9db 4774 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 4775 if (ret == -EAGAIN)
4776 break;
4777 else if (ret < 0) {
c66ac9db 4778 cmd->transport_error_status = ret;
4499dda8 4779 transport_generic_request_failure(cmd,
c66ac9db
NB		 4780 0, (cmd->data_direction !=
4781 DMA_TO_DEVICE));
4782 }
4783 break;
4784 case TRANSPORT_PROCESS_WRITE:
4785 transport_generic_process_write(cmd);
4786 break;
4787 case TRANSPORT_COMPLETE_OK:
c66ac9db
NB		 4788 transport_generic_complete_ok(cmd);
4789 break;
4790 case TRANSPORT_REMOVE:
e6a2573f 4791 transport_put_cmd(cmd);
c66ac9db 4792 break;
f4366772 4793 case TRANSPORT_FREE_CMD_INTR:
82f1c8a4 4794 transport_generic_free_cmd(cmd, 0);
f4366772 4795 break;
c66ac9db
NB		 4796 case TRANSPORT_PROCESS_TMR:
4797 transport_generic_do_tmr(cmd);
4798 break;
4799 case TRANSPORT_COMPLETE_FAILURE:
4499dda8 4800 transport_generic_request_failure(cmd, 1, 1);
c66ac9db
NB		 4801 break;
4802 case TRANSPORT_COMPLETE_TIMEOUT:
c66ac9db
NB		 4803 transport_generic_request_timeout(cmd);
4804 break;
07bde79a 4805 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4806 transport_write_pending_qf(cmd);
4807 break;
4808 case TRANSPORT_COMPLETE_QF_OK:
4809 transport_complete_qf(cmd);
07bde79a 4810 break;
c66ac9db 4811 default:
6708bb27 4812 pr_err("Unknown t_state: %d deferred_t_state:"
c66ac9db 4813 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5951146d 4814 " %u\n", cmd->t_state, cmd->deferred_t_state,
e3d6f909
AG		 4815 cmd->se_tfo->get_task_tag(cmd),
4816 cmd->se_tfo->get_cmd_state(cmd),
4817 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4818 BUG();
4819 }
4820
4821 goto get_cmd;
4822 }
4823
4824out:
ce8762f6
NB		 4825 WARN_ON(!list_empty(&dev->state_task_list));
4826 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4827 dev->process_thread = NULL;
4828 return 0;
4829}
Linux kernel - Deliverables
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