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target: remove SCF_EMULATE_QUEUE_FULL
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
39#include <asm/unaligned.h>
40#include <net/sock.h>
41#include <net/tcp.h>
42#include <scsi/scsi.h>
43#include <scsi/scsi_cmnd.h>
e66ecd50 44#include <scsi/scsi_tcq.h>
c66ac9db
NB		 45
46#include <target/target_core_base.h>
47#include <target/target_core_device.h>
48#include <target/target_core_tmr.h>
49#include <target/target_core_tpg.h>
50#include <target/target_core_transport.h>
51#include <target/target_core_fabric_ops.h>
52#include <target/target_core_configfs.h>
53
54#include "target_core_alua.h"
55#include "target_core_hba.h"
56#include "target_core_pr.h"
c66ac9db
NB		 57#include "target_core_ua.h"
58
e3d6f909 59static int sub_api_initialized;
c66ac9db
NB		 60
61static struct kmem_cache *se_cmd_cache;
62static struct kmem_cache *se_sess_cache;
63struct kmem_cache *se_tmr_req_cache;
64struct kmem_cache *se_ua_cache;
c66ac9db
NB		 65struct kmem_cache *t10_pr_reg_cache;
66struct kmem_cache *t10_alua_lu_gp_cache;
67struct kmem_cache *t10_alua_lu_gp_mem_cache;
68struct kmem_cache *t10_alua_tg_pt_gp_cache;
69struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
70
c66ac9db 71static int transport_generic_write_pending(struct se_cmd *);
5951146d 72static int transport_processing_thread(void *param);
c66ac9db
NB		 73static int __transport_execute_tasks(struct se_device *dev);
74static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 75static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 76 struct se_device *dev);
c66ac9db
NB		 77static void transport_direct_request_timeout(struct se_cmd *cmd);
78static void transport_free_dev_tasks(struct se_cmd *cmd);
a1d8b49a 79static u32 transport_allocate_tasks(struct se_cmd *cmd,
ec98f782 80 unsigned long long starting_lba,
c66ac9db 81 enum dma_data_direction data_direction,
ec98f782 82 struct scatterlist *sgl, unsigned int nents);
05d1c7c0 83static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 84static void transport_put_cmd(struct se_cmd *cmd);
c66ac9db
NB		 85static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
86 struct se_queue_obj *qobj);
87static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
88static void transport_stop_all_task_timers(struct se_cmd *cmd);
89
e3d6f909 90int init_se_kmem_caches(void)
c66ac9db 91{
c66ac9db
NB		 92 se_cmd_cache = kmem_cache_create("se_cmd_cache",
93 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
6708bb27
AG		 94 if (!se_cmd_cache) {
95 pr_err("kmem_cache_create for struct se_cmd failed\n");
c66ac9db
NB		 96 goto out;
97 }
98 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
99 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
100 0, NULL);
6708bb27
AG		 101 if (!se_tmr_req_cache) {
102 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db
NB		 103 " failed\n");
104 goto out;
105 }
106 se_sess_cache = kmem_cache_create("se_sess_cache",
107 sizeof(struct se_session), __alignof__(struct se_session),
108 0, NULL);
6708bb27
AG		 109 if (!se_sess_cache) {
110 pr_err("kmem_cache_create() for struct se_session"
c66ac9db
NB		 111 " failed\n");
112 goto out;
113 }
114 se_ua_cache = kmem_cache_create("se_ua_cache",
115 sizeof(struct se_ua), __alignof__(struct se_ua),
116 0, NULL);
6708bb27
AG		 117 if (!se_ua_cache) {
118 pr_err("kmem_cache_create() for struct se_ua failed\n");
c66ac9db
NB		 119 goto out;
120 }
c66ac9db
NB		 121 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
122 sizeof(struct t10_pr_registration),
123 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 124 if (!t10_pr_reg_cache) {
125 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db
NB		 126 " failed\n");
127 goto out;
128 }
129 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
130 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
131 0, NULL);
6708bb27
AG		 132 if (!t10_alua_lu_gp_cache) {
133 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db
NB		 134 " failed\n");
135 goto out;
136 }
137 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
138 sizeof(struct t10_alua_lu_gp_member),
139 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 140 if (!t10_alua_lu_gp_mem_cache) {
141 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db
NB		 142 "cache failed\n");
143 goto out;
144 }
145 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
146 sizeof(struct t10_alua_tg_pt_gp),
147 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 148 if (!t10_alua_tg_pt_gp_cache) {
149 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 150 "cache failed\n");
151 goto out;
152 }
153 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
154 "t10_alua_tg_pt_gp_mem_cache",
155 sizeof(struct t10_alua_tg_pt_gp_member),
156 __alignof__(struct t10_alua_tg_pt_gp_member),
157 0, NULL);
6708bb27
AG		 158 if (!t10_alua_tg_pt_gp_mem_cache) {
159 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 160 "mem_t failed\n");
161 goto out;
162 }
163
c66ac9db
NB		 164 return 0;
165out:
166 if (se_cmd_cache)
167 kmem_cache_destroy(se_cmd_cache);
168 if (se_tmr_req_cache)
169 kmem_cache_destroy(se_tmr_req_cache);
170 if (se_sess_cache)
171 kmem_cache_destroy(se_sess_cache);
172 if (se_ua_cache)
173 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 174 if (t10_pr_reg_cache)
175 kmem_cache_destroy(t10_pr_reg_cache);
176 if (t10_alua_lu_gp_cache)
177 kmem_cache_destroy(t10_alua_lu_gp_cache);
178 if (t10_alua_lu_gp_mem_cache)
179 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
180 if (t10_alua_tg_pt_gp_cache)
181 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
182 if (t10_alua_tg_pt_gp_mem_cache)
183 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
e3d6f909 184 return -ENOMEM;
c66ac9db
NB		 185}
186
e3d6f909 187void release_se_kmem_caches(void)
c66ac9db 188{
c66ac9db
NB		 189 kmem_cache_destroy(se_cmd_cache);
190 kmem_cache_destroy(se_tmr_req_cache);
191 kmem_cache_destroy(se_sess_cache);
192 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 193 kmem_cache_destroy(t10_pr_reg_cache);
194 kmem_cache_destroy(t10_alua_lu_gp_cache);
195 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
196 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
197 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 198}
199
e3d6f909
AG		 200/* This code ensures unique mib indexes are handed out. */
201static DEFINE_SPINLOCK(scsi_mib_index_lock);
202static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 203
204/*
205 * Allocate a new row index for the entry type specified
206 */
207u32 scsi_get_new_index(scsi_index_t type)
208{
209 u32 new_index;
210
e3d6f909 211 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 212
e3d6f909
AG		 213 spin_lock(&scsi_mib_index_lock);
214 new_index = ++scsi_mib_index[type];
215 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 216
217 return new_index;
218}
219
c66ac9db
NB		 220void transport_init_queue_obj(struct se_queue_obj *qobj)
221{
222 atomic_set(&qobj->queue_cnt, 0);
223 INIT_LIST_HEAD(&qobj->qobj_list);
224 init_waitqueue_head(&qobj->thread_wq);
225 spin_lock_init(&qobj->cmd_queue_lock);
226}
227EXPORT_SYMBOL(transport_init_queue_obj);
228
229static int transport_subsystem_reqmods(void)
230{
231 int ret;
232
233 ret = request_module("target_core_iblock");
234 if (ret != 0)
6708bb27 235 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 236
237 ret = request_module("target_core_file");
238 if (ret != 0)
6708bb27 239 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 240
241 ret = request_module("target_core_pscsi");
242 if (ret != 0)
6708bb27 243 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 244
245 ret = request_module("target_core_stgt");
246 if (ret != 0)
6708bb27 247 pr_err("Unable to load target_core_stgt\n");
c66ac9db
NB		 248
249 return 0;
250}
251
252int transport_subsystem_check_init(void)
253{
e3d6f909
AG		 254 int ret;
255
256 if (sub_api_initialized)
c66ac9db
NB		 257 return 0;
258 /*
259 * Request the loading of known TCM subsystem plugins..
260 */
e3d6f909
AG		 261 ret = transport_subsystem_reqmods();
262 if (ret < 0)
263 return ret;
c66ac9db 264
e3d6f909 265 sub_api_initialized = 1;
c66ac9db
NB		 266 return 0;
267}
268
269struct se_session *transport_init_session(void)
270{
271 struct se_session *se_sess;
272
273 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 274 if (!se_sess) {
275 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 276 " se_sess_cache\n");
277 return ERR_PTR(-ENOMEM);
278 }
279 INIT_LIST_HEAD(&se_sess->sess_list);
280 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 281
282 return se_sess;
283}
284EXPORT_SYMBOL(transport_init_session);
285
286/*
287 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
288 */
289void __transport_register_session(
290 struct se_portal_group *se_tpg,
291 struct se_node_acl *se_nacl,
292 struct se_session *se_sess,
293 void *fabric_sess_ptr)
294{
295 unsigned char buf[PR_REG_ISID_LEN];
296
297 se_sess->se_tpg = se_tpg;
298 se_sess->fabric_sess_ptr = fabric_sess_ptr;
299 /*
300 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
301 *
302 * Only set for struct se_session's that will actually be moving I/O.
303 * eg: *NOT* discovery sessions.
304 */
305 if (se_nacl) {
306 /*
307 * If the fabric module supports an ISID based TransportID,
308 * save this value in binary from the fabric I_T Nexus now.
309 */
e3d6f909 310 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 311 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 312 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 313 &buf[0], PR_REG_ISID_LEN);
314 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
315 }
316 spin_lock_irq(&se_nacl->nacl_sess_lock);
317 /*
318 * The se_nacl->nacl_sess pointer will be set to the
319 * last active I_T Nexus for each struct se_node_acl.
320 */
321 se_nacl->nacl_sess = se_sess;
322
323 list_add_tail(&se_sess->sess_acl_list,
324 &se_nacl->acl_sess_list);
325 spin_unlock_irq(&se_nacl->nacl_sess_lock);
326 }
327 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
328
6708bb27 329 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 330 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 331}
332EXPORT_SYMBOL(__transport_register_session);
333
334void transport_register_session(
335 struct se_portal_group *se_tpg,
336 struct se_node_acl *se_nacl,
337 struct se_session *se_sess,
338 void *fabric_sess_ptr)
339{
340 spin_lock_bh(&se_tpg->session_lock);
341 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
342 spin_unlock_bh(&se_tpg->session_lock);
343}
344EXPORT_SYMBOL(transport_register_session);
345
346void transport_deregister_session_configfs(struct se_session *se_sess)
347{
348 struct se_node_acl *se_nacl;
23388864 349 unsigned long flags;
c66ac9db
NB		 350 /*
351 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
352 */
353 se_nacl = se_sess->se_node_acl;
6708bb27 354 if (se_nacl) {
23388864 355 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 356 list_del(&se_sess->sess_acl_list);
357 /*
358 * If the session list is empty, then clear the pointer.
359 * Otherwise, set the struct se_session pointer from the tail
360 * element of the per struct se_node_acl active session list.
361 */
362 if (list_empty(&se_nacl->acl_sess_list))
363 se_nacl->nacl_sess = NULL;
364 else {
365 se_nacl->nacl_sess = container_of(
366 se_nacl->acl_sess_list.prev,
367 struct se_session, sess_acl_list);
368 }
23388864 369 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 370 }
371}
372EXPORT_SYMBOL(transport_deregister_session_configfs);
373
374void transport_free_session(struct se_session *se_sess)
375{
376 kmem_cache_free(se_sess_cache, se_sess);
377}
378EXPORT_SYMBOL(transport_free_session);
379
380void transport_deregister_session(struct se_session *se_sess)
381{
382 struct se_portal_group *se_tpg = se_sess->se_tpg;
383 struct se_node_acl *se_nacl;
e63a8e19 384 unsigned long flags;
c66ac9db 385
6708bb27 386 if (!se_tpg) {
c66ac9db
NB		 387 transport_free_session(se_sess);
388 return;
389 }
c66ac9db 390
e63a8e19 391 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 392 list_del(&se_sess->sess_list);
393 se_sess->se_tpg = NULL;
394 se_sess->fabric_sess_ptr = NULL;
e63a8e19 395 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 396
397 /*
398 * Determine if we need to do extra work for this initiator node's
399 * struct se_node_acl if it had been previously dynamically generated.
400 */
401 se_nacl = se_sess->se_node_acl;
6708bb27 402 if (se_nacl) {
e63a8e19 403 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 404 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 405 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
406 se_tpg)) {
c66ac9db
NB		 407 list_del(&se_nacl->acl_list);
408 se_tpg->num_node_acls--;
e63a8e19 409 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 410
411 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 412 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 413 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 414 se_nacl);
e63a8e19 415 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 416 }
417 }
e63a8e19 418 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 419 }
420
421 transport_free_session(se_sess);
422
6708bb27 423 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 424 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 425}
426EXPORT_SYMBOL(transport_deregister_session);
427
428/*
a1d8b49a 429 * Called with cmd->t_state_lock held.
c66ac9db
NB		 430 */
431static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
432{
42bf829e 433 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 434 struct se_task *task;
435 unsigned long flags;
436
42bf829e
CH		 437 if (!dev)
438 return;
c66ac9db 439
42bf829e 440 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 441 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 442 continue;
443
6708bb27 444 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 445 continue;
446
447 spin_lock_irqsave(&dev->execute_task_lock, flags);
448 list_del(&task->t_state_list);
6708bb27
AG		 449 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
450 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 451 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
452
453 atomic_set(&task->task_state_active, 0);
a1d8b49a 454 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 455 }
456}
457
458/* transport_cmd_check_stop():
459 *
460 * 'transport_off = 1' determines if t_transport_active should be cleared.
461 * 'transport_off = 2' determines if task_dev_state should be removed.
462 *
463 * A non-zero u8 t_state sets cmd->t_state.
464 * Returns 1 when command is stopped, else 0.
465 */
466static int transport_cmd_check_stop(
467 struct se_cmd *cmd,
468 int transport_off,
469 u8 t_state)
470{
471 unsigned long flags;
472
a1d8b49a 473 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 474 /*
475 * Determine if IOCTL context caller in requesting the stopping of this
476 * command for LUN shutdown purposes.
477 */
a1d8b49a 478 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 479 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 480 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 481 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 482
483 cmd->deferred_t_state = cmd->t_state;
484 cmd->t_state = TRANSPORT_DEFERRED_CMD;
a1d8b49a 485 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 486 if (transport_off == 2)
487 transport_all_task_dev_remove_state(cmd);
a1d8b49a 488 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 489
a1d8b49a 490 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 491 return 1;
492 }
493 /*
494 * Determine if frontend context caller is requesting the stopping of
e3d6f909 495 * this command for frontend exceptions.
c66ac9db 496 */
a1d8b49a 497 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 498 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 499 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 500 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 501
502 cmd->deferred_t_state = cmd->t_state;
503 cmd->t_state = TRANSPORT_DEFERRED_CMD;
504 if (transport_off == 2)
505 transport_all_task_dev_remove_state(cmd);
506
507 /*
508 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
509 * to FE.
510 */
511 if (transport_off == 2)
512 cmd->se_lun = NULL;
a1d8b49a 513 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 514
a1d8b49a 515 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 516 return 1;
517 }
518 if (transport_off) {
a1d8b49a 519 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 520 if (transport_off == 2) {
521 transport_all_task_dev_remove_state(cmd);
522 /*
523 * Clear struct se_cmd->se_lun before the transport_off == 2
524 * handoff to fabric module.
525 */
526 cmd->se_lun = NULL;
527 /*
528 * Some fabric modules like tcm_loop can release
25985edc 529 * their internally allocated I/O reference now and
c66ac9db
NB		 530 * struct se_cmd now.
531 */
e3d6f909 532 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 533 spin_unlock_irqrestore(
a1d8b49a 534 &cmd->t_state_lock, flags);
c66ac9db 535
e3d6f909 536 cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 537 return 1;
538 }
539 }
a1d8b49a 540 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 541
542 return 0;
543 } else if (t_state)
544 cmd->t_state = t_state;
a1d8b49a 545 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 546
547 return 0;
548}
549
550static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
551{
552 return transport_cmd_check_stop(cmd, 2, 0);
553}
554
555static void transport_lun_remove_cmd(struct se_cmd *cmd)
556{
e3d6f909 557 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 558 unsigned long flags;
559
560 if (!lun)
561 return;
562
a1d8b49a 563 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 564 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 565 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 566 goto check_lun;
567 }
a1d8b49a 568 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 569 transport_all_task_dev_remove_state(cmd);
a1d8b49a 570 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 571
c66ac9db
NB		 572
573check_lun:
574 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 575 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 576 list_del(&cmd->se_lun_node);
a1d8b49a 577 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 578#if 0
6708bb27 579 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 580 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 581#endif
582 }
583 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
584}
585
586void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
587{
8dc52b54
NB		 588 if (!cmd->se_tmr_req)
589 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 590
591 if (transport_cmd_check_stop_to_fabric(cmd))
592 return;
77039d1e
NB		 593 if (remove) {
594 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
e6a2573f 595 transport_put_cmd(cmd);
77039d1e 596 }
c66ac9db
NB		 597}
598
f7a5cc0b
CH		 599static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
600 bool at_head)
c66ac9db
NB		 601{
602 struct se_device *dev = cmd->se_dev;
e3d6f909 603 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 604 unsigned long flags;
605
c66ac9db 606 if (t_state) {
a1d8b49a 607 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 608 cmd->t_state = t_state;
a1d8b49a
AG		 609 atomic_set(&cmd->t_transport_active, 1);
610 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 611 }
612
613 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 614
615 /* If the cmd is already on the list, remove it before we add it */
616 if (!list_empty(&cmd->se_queue_node))
617 list_del(&cmd->se_queue_node);
618 else
619 atomic_inc(&qobj->queue_cnt);
620
f7a5cc0b 621 if (at_head)
07bde79a 622 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 623 else
07bde79a 624 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 625 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 626 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
627
c66ac9db 628 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 629}
630
5951146d
AG		 631static struct se_cmd *
632transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 633{
5951146d 634 struct se_cmd *cmd;
c66ac9db
NB		 635 unsigned long flags;
636
637 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
638 if (list_empty(&qobj->qobj_list)) {
639 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
640 return NULL;
641 }
5951146d 642 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 643
79a7fef2 644 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 645
79a7fef2 646 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 647 atomic_dec(&qobj->queue_cnt);
648 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
649
5951146d 650 return cmd;
c66ac9db
NB		 651}
652
653static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
654 struct se_queue_obj *qobj)
655{
c66ac9db
NB		 656 unsigned long flags;
657
658 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 659 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 660 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
661 return;
662 }
79a7fef2
RD		 663 atomic_set(&cmd->t_transport_queue_active, 0);
664 atomic_dec(&qobj->queue_cnt);
665 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 666 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
667
a1d8b49a 668 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 669 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 670 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 671 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 672 }
673}
674
675/*
676 * Completion function used by TCM subsystem plugins (such as FILEIO)
677 * for queueing up response from struct se_subsystem_api->do_task()
678 */
679void transport_complete_sync_cache(struct se_cmd *cmd, int good)
680{
a1d8b49a 681 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 682 struct se_task, t_list);
683
684 if (good) {
685 cmd->scsi_status = SAM_STAT_GOOD;
686 task->task_scsi_status = GOOD;
687 } else {
688 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
689 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 690 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 691 PYX_TRANSPORT_ILLEGAL_REQUEST;
692 }
693
694 transport_complete_task(task, good);
695}
696EXPORT_SYMBOL(transport_complete_sync_cache);
697
698/* transport_complete_task():
699 *
700 * Called from interrupt and non interrupt context depending
701 * on the transport plugin.
702 */
703void transport_complete_task(struct se_task *task, int success)
704{
e3d6f909 705 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 706 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 707 int t_state;
708 unsigned long flags;
709#if 0
6708bb27 710 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 711 cmd->t_task_cdb[0], dev);
c66ac9db 712#endif
e3d6f909 713 if (dev)
c66ac9db 714 atomic_inc(&dev->depth_left);
c66ac9db 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);
1511 init_completion(&task->task_stop_comp);
c66ac9db 1512 task->task_se_cmd = cmd;
c66ac9db
NB		 1513 task->task_data_direction = data_direction;
1514
c66ac9db
NB		 1515 return task;
1516}
1517
1518static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1519
c66ac9db
NB		 1520/*
1521 * Used by fabric modules containing a local struct se_cmd within their
1522 * fabric dependent per I/O descriptor.
1523 */
1524void transport_init_se_cmd(
1525 struct se_cmd *cmd,
1526 struct target_core_fabric_ops *tfo,
1527 struct se_session *se_sess,
1528 u32 data_length,
1529 int data_direction,
1530 int task_attr,
1531 unsigned char *sense_buffer)
1532{
5951146d
AG		 1533 INIT_LIST_HEAD(&cmd->se_lun_node);
1534 INIT_LIST_HEAD(&cmd->se_delayed_node);
1535 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1536 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1537 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db 1538
a1d8b49a
AG		 1539 INIT_LIST_HEAD(&cmd->t_task_list);
1540 init_completion(&cmd->transport_lun_fe_stop_comp);
1541 init_completion(&cmd->transport_lun_stop_comp);
1542 init_completion(&cmd->t_transport_stop_comp);
1543 spin_lock_init(&cmd->t_state_lock);
1544 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1545
1546 cmd->se_tfo = tfo;
1547 cmd->se_sess = se_sess;
1548 cmd->data_length = data_length;
1549 cmd->data_direction = data_direction;
1550 cmd->sam_task_attr = task_attr;
1551 cmd->sense_buffer = sense_buffer;
1552}
1553EXPORT_SYMBOL(transport_init_se_cmd);
1554
1555static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1556{
1557 /*
1558 * Check if SAM Task Attribute emulation is enabled for this
1559 * struct se_device storage object
1560 */
5951146d 1561 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1562 return 0;
1563
e66ecd50 1564 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1565 pr_debug("SAM Task Attribute ACA"
c66ac9db 1566 " emulation is not supported\n");
e3d6f909 1567 return -EINVAL;
c66ac9db
NB		 1568 }
1569 /*
1570 * Used to determine when ORDERED commands should go from
1571 * Dormant to Active status.
1572 */
5951146d 1573 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1574 smp_mb__after_atomic_inc();
6708bb27 1575 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1576 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1577 cmd->se_dev->transport->name);
c66ac9db
NB		 1578 return 0;
1579}
1580
c66ac9db
NB		 1581/* transport_generic_allocate_tasks():
1582 *
1583 * Called from fabric RX Thread.
1584 */
1585int transport_generic_allocate_tasks(
1586 struct se_cmd *cmd,
1587 unsigned char *cdb)
1588{
1589 int ret;
1590
1591 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1592 /*
1593 * Ensure that the received CDB is less than the max (252 + 8) bytes
1594 * for VARIABLE_LENGTH_CMD
1595 */
1596 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1597 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1598 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1599 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1600 return -EINVAL;
c66ac9db
NB		 1601 }
1602 /*
1603 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1604 * allocate the additional extended CDB buffer now.. Otherwise
1605 * setup the pointer from __t_task_cdb to t_task_cdb.
1606 */
a1d8b49a
AG		 1607 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1608 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1609 GFP_KERNEL);
6708bb27
AG		 1610 if (!cmd->t_task_cdb) {
1611 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1612 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1613 scsi_command_size(cdb),
a1d8b49a 1614 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1615 return -ENOMEM;
c66ac9db
NB		 1616 }
1617 } else
a1d8b49a 1618 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1619 /*
a1d8b49a 1620 * Copy the original CDB into cmd->
c66ac9db 1621 */
a1d8b49a 1622 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1623 /*
1624 * Setup the received CDB based on SCSI defined opcodes and
1625 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1626 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1627 * pointer is expected to be setup before we reach this point.
1628 */
1629 ret = transport_generic_cmd_sequencer(cmd, cdb);
1630 if (ret < 0)
1631 return ret;
1632 /*
1633 * Check for SAM Task Attribute Emulation
1634 */
1635 if (transport_check_alloc_task_attr(cmd) < 0) {
1636 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1637 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1638 return -EINVAL;
c66ac9db
NB		 1639 }
1640 spin_lock(&cmd->se_lun->lun_sep_lock);
1641 if (cmd->se_lun->lun_sep)
1642 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1643 spin_unlock(&cmd->se_lun->lun_sep_lock);
1644 return 0;
1645}
1646EXPORT_SYMBOL(transport_generic_allocate_tasks);
1647
dd8ae59d
NB		 1648static void transport_generic_request_failure(struct se_cmd *,
1649 struct se_device *, int, int);
695434e1
NB		 1650/*
1651 * Used by fabric module frontends to queue tasks directly.
1652 * Many only be used from process context only
1653 */
1654int transport_handle_cdb_direct(
1655 struct se_cmd *cmd)
1656{
dd8ae59d
NB		 1657 int ret;
1658
695434e1
NB		 1659 if (!cmd->se_lun) {
1660 dump_stack();
6708bb27 1661 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1662 return -EINVAL;
1663 }
1664 if (in_interrupt()) {
1665 dump_stack();
6708bb27 1666 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1667 " from interrupt context\n");
1668 return -EINVAL;
1669 }
dd8ae59d
NB		 1670 /*
1671 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1672 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1673 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1674 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1675 *
1676 * Also, we don't take cmd->t_state_lock here as we only expect
1677 * this to be called for initial descriptor submission.
1678 */
1679 cmd->t_state = TRANSPORT_NEW_CMD;
1680 atomic_set(&cmd->t_transport_active, 1);
1681 /*
1682 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1683 * so follow TRANSPORT_NEW_CMD processing thread context usage
1684 * and call transport_generic_request_failure() if necessary..
1685 */
1686 ret = transport_generic_new_cmd(cmd);
1687 if (ret == -EAGAIN)
1688 return 0;
1689 else if (ret < 0) {
1690 cmd->transport_error_status = ret;
1691 transport_generic_request_failure(cmd, NULL, 0,
1692 (cmd->data_direction != DMA_TO_DEVICE));
1693 }
1694 return 0;
695434e1
NB		 1695}
1696EXPORT_SYMBOL(transport_handle_cdb_direct);
1697
c66ac9db
NB		 1698/*
1699 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1700 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1701 * complete setup in TCM process context w/ TFO->new_cmd_map().
1702 */
1703int transport_generic_handle_cdb_map(
1704 struct se_cmd *cmd)
1705{
e3d6f909 1706 if (!cmd->se_lun) {
c66ac9db 1707 dump_stack();
6708bb27 1708 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1709 return -EINVAL;
c66ac9db
NB		 1710 }
1711
f7a5cc0b 1712 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1713 return 0;
1714}
1715EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1716
1717/* transport_generic_handle_data():
1718 *
1719 *
1720 */
1721int transport_generic_handle_data(
1722 struct se_cmd *cmd)
1723{
1724 /*
1725 * For the software fabric case, then we assume the nexus is being
1726 * failed/shutdown when signals are pending from the kthread context
1727 * caller, so we return a failure. For the HW target mode case running
1728 * in interrupt code, the signal_pending() check is skipped.
1729 */
1730 if (!in_interrupt() && signal_pending(current))
e3d6f909 1731 return -EPERM;
c66ac9db
NB		 1732 /*
1733 * If the received CDB has aleady been ABORTED by the generic
1734 * target engine, we now call transport_check_aborted_status()
1735 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1736 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1737 * sequences at this point.
1738 */
1739 if (transport_check_aborted_status(cmd, 1) != 0)
1740 return 0;
1741
f7a5cc0b 1742 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1743 return 0;
1744}
1745EXPORT_SYMBOL(transport_generic_handle_data);
1746
1747/* transport_generic_handle_tmr():
1748 *
1749 *
1750 */
1751int transport_generic_handle_tmr(
1752 struct se_cmd *cmd)
1753{
f7a5cc0b 1754 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1755 return 0;
1756}
1757EXPORT_SYMBOL(transport_generic_handle_tmr);
1758
f4366772
NB		 1759void transport_generic_free_cmd_intr(
1760 struct se_cmd *cmd)
1761{
f7a5cc0b 1762 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
f4366772
NB		 1763}
1764EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1765
c66ac9db
NB		 1766static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1767{
1768 struct se_task *task, *task_tmp;
1769 unsigned long flags;
1770 int ret = 0;
1771
6708bb27 1772 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1773 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1774
1775 /*
1776 * No tasks remain in the execution queue
1777 */
a1d8b49a 1778 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1779 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1780 &cmd->t_task_list, t_list) {
04629b7b 1781 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1782 /*
1783 * If the struct se_task has not been sent and is not active,
1784 * remove the struct se_task from the execution queue.
1785 */
6c76bf95 1786 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1787 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1788 flags);
1789 transport_remove_task_from_execute_queue(task,
42bf829e 1790 cmd->se_dev);
c66ac9db 1791
04629b7b 1792 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1793 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1794 continue;
1795 }
1796
1797 /*
1798 * If the struct se_task is active, sleep until it is returned
1799 * from the plugin.
1800 */
6c76bf95
CH		 1801 if (task->task_flags & TF_ACTIVE) {
1802 task->task_flags |= TF_REQUEST_STOP;
a1d8b49a 1803 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1804 flags);
1805
04629b7b 1806 pr_debug("Task %p waiting to complete\n", task);
c66ac9db 1807 wait_for_completion(&task->task_stop_comp);
04629b7b 1808 pr_debug("Task %p stopped successfully\n", task);
c66ac9db 1809
a1d8b49a
AG		 1810 spin_lock_irqsave(&cmd->t_state_lock, flags);
1811 atomic_dec(&cmd->t_task_cdbs_left);
6c76bf95 1812 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
c66ac9db 1813 } else {
04629b7b 1814 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1815 ret++;
1816 }
1817
1818 __transport_stop_task_timer(task, &flags);
1819 }
a1d8b49a 1820 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1821
1822 return ret;
1823}
1824
c66ac9db
NB		 1825/*
1826 * Handle SAM-esque emulation for generic transport request failures.
1827 */
1828static void transport_generic_request_failure(
1829 struct se_cmd *cmd,
1830 struct se_device *dev,
1831 int complete,
1832 int sc)
1833{
07bde79a
NB		 1834 int ret = 0;
1835
6708bb27 1836 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1837 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1838 cmd->t_task_cdb[0]);
6708bb27 1839 pr_debug("-----[ i_state: %d t_state/def_t_state:"
c66ac9db 1840 " %d/%d transport_error_status: %d\n",
e3d6f909 1841 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db
NB		 1842 cmd->t_state, cmd->deferred_t_state,
1843 cmd->transport_error_status);
6708bb27 1844 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1845 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1846 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1847 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1848 atomic_read(&cmd->t_task_cdbs_left),
1849 atomic_read(&cmd->t_task_cdbs_sent),
1850 atomic_read(&cmd->t_task_cdbs_ex_left),
1851 atomic_read(&cmd->t_transport_active),
1852 atomic_read(&cmd->t_transport_stop),
1853 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 1854
1855 transport_stop_all_task_timers(cmd);
1856
1857 if (dev)
e3d6f909 1858 atomic_inc(&dev->depth_left);
c66ac9db
NB		 1859 /*
1860 * For SAM Task Attribute emulation for failed struct se_cmd
1861 */
1862 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1863 transport_complete_task_attr(cmd);
1864
1865 if (complete) {
1866 transport_direct_request_timeout(cmd);
1867 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1868 }
1869
1870 switch (cmd->transport_error_status) {
1871 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1872 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1873 break;
1874 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1875 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1876 break;
1877 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1878 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1879 break;
1880 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1881 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1882 break;
1883 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1884 if (!sc)
1885 transport_new_cmd_failure(cmd);
1886 /*
1887 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1888 * we force this session to fall back to session
1889 * recovery.
1890 */
e3d6f909
AG		 1891 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1892 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 1893
1894 goto check_stop;
1895 case PYX_TRANSPORT_LU_COMM_FAILURE:
1896 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1897 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1898 break;
1899 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1900 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1901 break;
1902 case PYX_TRANSPORT_WRITE_PROTECTED:
1903 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1904 break;
1905 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1906 /*
1907 * No SENSE Data payload for this case, set SCSI Status
1908 * and queue the response to $FABRIC_MOD.
1909 *
1910 * Uses linux/include/scsi/scsi.h SAM status codes defs
1911 */
1912 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1913 /*
1914 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1915 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1916 * CONFLICT STATUS.
1917 *
1918 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1919 */
e3d6f909
AG		 1920 if (cmd->se_sess &&
1921 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1922 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1923 cmd->orig_fe_lun, 0x2C,
1924 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1925
07bde79a
NB		 1926 ret = cmd->se_tfo->queue_status(cmd);
1927 if (ret == -EAGAIN)
1928 goto queue_full;
c66ac9db
NB		 1929 goto check_stop;
1930 case PYX_TRANSPORT_USE_SENSE_REASON:
1931 /*
1932 * struct se_cmd->scsi_sense_reason already set
1933 */
1934 break;
1935 default:
6708bb27 1936 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 1937 cmd->t_task_cdb[0],
c66ac9db
NB		 1938 cmd->transport_error_status);
1939 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1940 break;
1941 }
16ab8e60
NB		 1942 /*
1943 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1944 * make the call to transport_send_check_condition_and_sense()
1945 * directly. Otherwise expect the fabric to make the call to
1946 * transport_send_check_condition_and_sense() after handling
1947 * possible unsoliticied write data payloads.
1948 */
1949 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 1950 transport_new_cmd_failure(cmd);
07bde79a
NB		 1951 else {
1952 ret = transport_send_check_condition_and_sense(cmd,
1953 cmd->scsi_sense_reason, 0);
1954 if (ret == -EAGAIN)
1955 goto queue_full;
1956 }
1957
c66ac9db
NB		 1958check_stop:
1959 transport_lun_remove_cmd(cmd);
6708bb27 1960 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1961 ;
07bde79a
NB		 1962 return;
1963
1964queue_full:
e057f533
CH		 1965 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1966 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1967}
1968
1969static void transport_direct_request_timeout(struct se_cmd *cmd)
1970{
1971 unsigned long flags;
1972
a1d8b49a 1973 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 1974 if (!atomic_read(&cmd->t_transport_timeout)) {
a1d8b49a 1975 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1976 return;
1977 }
a1d8b49a
AG		 1978 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
1979 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1980 return;
1981 }
1982
a1d8b49a
AG		 1983 atomic_sub(atomic_read(&cmd->t_transport_timeout),
1984 &cmd->t_se_count);
1985 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1986}
1987
1988static void transport_generic_request_timeout(struct se_cmd *cmd)
1989{
1990 unsigned long flags;
1991
1992 /*
e6a2573f 1993 * Reset cmd->t_se_count to allow transport_put_cmd()
c66ac9db
NB		 1994 * to allow last call to free memory resources.
1995 */
a1d8b49a
AG		 1996 spin_lock_irqsave(&cmd->t_state_lock, flags);
1997 if (atomic_read(&cmd->t_transport_timeout) > 1) {
1998 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 1999
a1d8b49a 2000 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2001 }
a1d8b49a 2002 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2003
e6a2573f 2004 transport_put_cmd(cmd);
c66ac9db
NB		 2005}
2006
c66ac9db
NB		 2007static inline u32 transport_lba_21(unsigned char *cdb)
2008{
2009 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2010}
2011
2012static inline u32 transport_lba_32(unsigned char *cdb)
2013{
2014 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2015}
2016
2017static inline unsigned long long transport_lba_64(unsigned char *cdb)
2018{
2019 unsigned int __v1, __v2;
2020
2021 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2022 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2023
2024 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2025}
2026
2027/*
2028 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2029 */
2030static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2031{
2032 unsigned int __v1, __v2;
2033
2034 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2035 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2036
2037 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2038}
2039
2040static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2041{
2042 unsigned long flags;
2043
a1d8b49a 2044 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2045 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2046 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2047}
2048
2049/*
2050 * Called from interrupt context.
2051 */
2052static void transport_task_timeout_handler(unsigned long data)
2053{
2054 struct se_task *task = (struct se_task *)data;
e3d6f909 2055 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2056 unsigned long flags;
2057
6708bb27 2058 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
c66ac9db 2059
a1d8b49a 2060 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2061 if (task->task_flags & TF_TIMER_STOP) {
a1d8b49a 2062 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2063 return;
2064 }
6c76bf95 2065 task->task_flags &= ~TF_TIMER_RUNNING;
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
2108/*
a1d8b49a 2109 * Called with cmd->t_state_lock held.
c66ac9db
NB		 2110 */
2111static void transport_start_task_timer(struct se_task *task)
2112{
42bf829e 2113 struct se_device *dev = task->task_se_cmd->se_dev;
c66ac9db
NB		 2114 int timeout;
2115
6c76bf95 2116 if (task->task_flags & TF_TIMER_RUNNING)
c66ac9db
NB		 2117 return;
2118 /*
2119 * If the task_timeout is disabled, exit now.
2120 */
e3d6f909 2121 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
6708bb27 2122 if (!timeout)
c66ac9db
NB		 2123 return;
2124
2125 init_timer(&task->task_timer);
2126 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2127 task->task_timer.data = (unsigned long) task;
2128 task->task_timer.function = transport_task_timeout_handler;
2129
6c76bf95 2130 task->task_flags |= TF_TIMER_RUNNING;
c66ac9db
NB		 2131 add_timer(&task->task_timer);
2132#if 0
6708bb27 2133 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
c66ac9db
NB		 2134 " %d\n", task->task_se_cmd, task, timeout);
2135#endif
2136}
2137
2138/*
a1d8b49a 2139 * Called with spin_lock_irq(&cmd->t_state_lock) held.
c66ac9db
NB		 2140 */
2141void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2142{
e3d6f909 2143 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db 2144
6c76bf95 2145 if (!(task->task_flags & TF_TIMER_RUNNING))
c66ac9db
NB		 2146 return;
2147
6c76bf95 2148 task->task_flags |= TF_TIMER_STOP;
a1d8b49a 2149 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2150
2151 del_timer_sync(&task->task_timer);
2152
a1d8b49a 2153 spin_lock_irqsave(&cmd->t_state_lock, *flags);
6c76bf95
CH		 2154 task->task_flags &= ~TF_TIMER_RUNNING;
2155 task->task_flags &= ~TF_TIMER_STOP;
c66ac9db
NB		 2156}
2157
2158static void transport_stop_all_task_timers(struct se_cmd *cmd)
2159{
2160 struct se_task *task = NULL, *task_tmp;
2161 unsigned long flags;
2162
a1d8b49a 2163 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2164 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2165 &cmd->t_task_list, t_list)
c66ac9db 2166 __transport_stop_task_timer(task, &flags);
a1d8b49a 2167 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2168}
2169
2170static inline int transport_tcq_window_closed(struct se_device *dev)
2171{
2172 if (dev->dev_tcq_window_closed++ <
2173 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2174 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2175 } else
2176 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2177
e3d6f909 2178 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2179 return 0;
2180}
2181
2182/*
2183 * Called from Fabric Module context from transport_execute_tasks()
2184 *
2185 * The return of this function determins if the tasks from struct se_cmd
2186 * get added to the execution queue in transport_execute_tasks(),
2187 * or are added to the delayed or ordered lists here.
2188 */
2189static inline int transport_execute_task_attr(struct se_cmd *cmd)
2190{
5951146d 2191 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2192 return 1;
2193 /*
25985edc 2194 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2195 * to allow the passed struct se_cmd list of tasks to the front of the list.
2196 */
e66ecd50 2197 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2198 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2199 smp_mb__after_atomic_inc();
6708bb27 2200 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2201 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2202 cmd->t_task_cdb[0],
c66ac9db
NB		 2203 cmd->se_ordered_id);
2204 return 1;
e66ecd50 2205 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2206 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2207 list_add_tail(&cmd->se_ordered_node,
2208 &cmd->se_dev->ordered_cmd_list);
2209 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2210
5951146d 2211 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2212 smp_mb__after_atomic_inc();
2213
6708bb27 2214 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2215 " list, se_ordered_id: %u\n",
a1d8b49a 2216 cmd->t_task_cdb[0],
c66ac9db
NB		 2217 cmd->se_ordered_id);
2218 /*
2219 * Add ORDERED command to tail of execution queue if
2220 * no other older commands exist that need to be
2221 * completed first.
2222 */
6708bb27 2223 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2224 return 1;
2225 } else {
2226 /*
2227 * For SIMPLE and UNTAGGED Task Attribute commands
2228 */
5951146d 2229 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2230 smp_mb__after_atomic_inc();
2231 }
2232 /*
2233 * Otherwise if one or more outstanding ORDERED task attribute exist,
2234 * add the dormant task(s) built for the passed struct se_cmd to the
2235 * execution queue and become in Active state for this struct se_device.
2236 */
5951146d 2237 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2238 /*
2239 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2240 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2241 */
5951146d 2242 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2243 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2244 list_add_tail(&cmd->se_delayed_node,
2245 &cmd->se_dev->delayed_cmd_list);
2246 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2247
6708bb27 2248 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2249 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2250 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2251 cmd->se_ordered_id);
2252 /*
2253 * Return zero to let transport_execute_tasks() know
2254 * not to add the delayed tasks to the execution list.
2255 */
2256 return 0;
2257 }
2258 /*
2259 * Otherwise, no ORDERED task attributes exist..
2260 */
2261 return 1;
2262}
2263
2264/*
2265 * Called from fabric module context in transport_generic_new_cmd() and
2266 * transport_generic_process_write()
2267 */
2268static int transport_execute_tasks(struct se_cmd *cmd)
2269{
2270 int add_tasks;
2271
db1620a2
CH		 2272 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2273 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2274 transport_generic_request_failure(cmd, NULL, 0, 1);
2275 return 0;
c66ac9db 2276 }
db1620a2 2277
c66ac9db
NB		 2278 /*
2279 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2280 * has occurred that prevents execution.
c66ac9db 2281 */
6708bb27 2282 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2283 /*
2284 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2285 * attribute for the tasks of the received struct se_cmd CDB
2286 */
2287 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2288 if (!add_tasks)
c66ac9db
NB		 2289 goto execute_tasks;
2290 /*
2291 * This calls transport_add_tasks_from_cmd() to handle
2292 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2293 * (if enabled) in __transport_add_task_to_execute_queue() and
2294 * transport_add_task_check_sam_attr().
2295 */
2296 transport_add_tasks_from_cmd(cmd);
2297 }
2298 /*
2299 * Kick the execution queue for the cmd associated struct se_device
2300 * storage object.
2301 */
2302execute_tasks:
5951146d 2303 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2304 return 0;
2305}
2306
2307/*
2308 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2309 * from struct se_device->execute_task_list and
2310 *
2311 * Called from transport_processing_thread()
2312 */
2313static int __transport_execute_tasks(struct se_device *dev)
2314{
2315 int error;
2316 struct se_cmd *cmd = NULL;
e3d6f909 2317 struct se_task *task = NULL;
c66ac9db
NB		 2318 unsigned long flags;
2319
2320 /*
2321 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2322 * struct se_tasks to the selected transport.
c66ac9db
NB		 2323 */
2324check_depth:
e3d6f909 2325 if (!atomic_read(&dev->depth_left))
c66ac9db 2326 return transport_tcq_window_closed(dev);
c66ac9db 2327
e3d6f909 2328 dev->dev_tcq_window_closed = 0;
c66ac9db 2329
e3d6f909
AG		 2330 spin_lock_irq(&dev->execute_task_lock);
2331 if (list_empty(&dev->execute_task_list)) {
2332 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2333 return 0;
2334 }
e3d6f909
AG		 2335 task = list_first_entry(&dev->execute_task_list,
2336 struct se_task, t_execute_list);
04629b7b 2337 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2338 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2339
2340 atomic_dec(&dev->depth_left);
c66ac9db 2341
e3d6f909 2342 cmd = task->task_se_cmd;
c66ac9db 2343
a1d8b49a 2344 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2345 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2346 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2347
a1d8b49a
AG		 2348 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2349 cmd->t_task_list_num)
c66ac9db
NB		 2350 atomic_set(&cmd->transport_sent, 1);
2351
2352 transport_start_task_timer(task);
a1d8b49a 2353 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2354 /*
2355 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2356 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2357 * struct se_subsystem_api->do_task() caller below.
2358 */
2359 if (cmd->transport_emulate_cdb) {
2360 error = cmd->transport_emulate_cdb(cmd);
2361 if (error != 0) {
2362 cmd->transport_error_status = error;
6c76bf95
CH		 2363 spin_lock_irqsave(&cmd->t_state_lock, flags);
2364 task->task_flags &= ~TF_ACTIVE;
2365 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2366 atomic_set(&cmd->transport_sent, 0);
2367 transport_stop_tasks_for_cmd(cmd);
2368 transport_generic_request_failure(cmd, dev, 0, 1);
2369 goto check_depth;
2370 }
2371 /*
2372 * Handle the successful completion for transport_emulate_cdb()
2373 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2374 * Otherwise the caller is expected to complete the task with
2375 * proper status.
2376 */
2377 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2378 cmd->scsi_status = SAM_STAT_GOOD;
2379 task->task_scsi_status = GOOD;
2380 transport_complete_task(task, 1);
2381 }
2382 } else {
2383 /*
2384 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2385 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2386 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2387 * LUN emulation code.
2388 *
2389 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2390 * call ->do_task() directly and let the underlying TCM subsystem plugin
2391 * code handle the CDB emulation.
2392 */
e3d6f909
AG		 2393 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2394 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2395 error = transport_emulate_control_cdb(task);
2396 else
e3d6f909 2397 error = dev->transport->do_task(task);
c66ac9db
NB		 2398
2399 if (error != 0) {
2400 cmd->transport_error_status = error;
6c76bf95
CH		 2401 spin_lock_irqsave(&cmd->t_state_lock, flags);
2402 task->task_flags &= ~TF_ACTIVE;
2403 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2404 atomic_set(&cmd->transport_sent, 0);
2405 transport_stop_tasks_for_cmd(cmd);
2406 transport_generic_request_failure(cmd, dev, 0, 1);
2407 }
2408 }
2409
2410 goto check_depth;
2411
2412 return 0;
2413}
2414
2415void transport_new_cmd_failure(struct se_cmd *se_cmd)
2416{
2417 unsigned long flags;
2418 /*
2419 * Any unsolicited data will get dumped for failed command inside of
2420 * the fabric plugin
2421 */
a1d8b49a 2422 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2423 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2424 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2425 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2426}
2427
c66ac9db
NB		 2428static inline u32 transport_get_sectors_6(
2429 unsigned char *cdb,
2430 struct se_cmd *cmd,
2431 int *ret)
2432{
5951146d 2433 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2434
2435 /*
2436 * Assume TYPE_DISK for non struct se_device objects.
2437 * Use 8-bit sector value.
2438 */
2439 if (!dev)
2440 goto type_disk;
2441
2442 /*
2443 * Use 24-bit allocation length for TYPE_TAPE.
2444 */
e3d6f909 2445 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2446 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2447
2448 /*
2449 * Everything else assume TYPE_DISK Sector CDB location.
2450 * Use 8-bit sector value.
2451 */
2452type_disk:
2453 return (u32)cdb[4];
2454}
2455
2456static inline u32 transport_get_sectors_10(
2457 unsigned char *cdb,
2458 struct se_cmd *cmd,
2459 int *ret)
2460{
5951146d 2461 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2462
2463 /*
2464 * Assume TYPE_DISK for non struct se_device objects.
2465 * Use 16-bit sector value.
2466 */
2467 if (!dev)
2468 goto type_disk;
2469
2470 /*
2471 * XXX_10 is not defined in SSC, throw an exception
2472 */
e3d6f909
AG		 2473 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2474 *ret = -EINVAL;
c66ac9db
NB		 2475 return 0;
2476 }
2477
2478 /*
2479 * Everything else assume TYPE_DISK Sector CDB location.
2480 * Use 16-bit sector value.
2481 */
2482type_disk:
2483 return (u32)(cdb[7] << 8) + cdb[8];
2484}
2485
2486static inline u32 transport_get_sectors_12(
2487 unsigned char *cdb,
2488 struct se_cmd *cmd,
2489 int *ret)
2490{
5951146d 2491 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2492
2493 /*
2494 * Assume TYPE_DISK for non struct se_device objects.
2495 * Use 32-bit sector value.
2496 */
2497 if (!dev)
2498 goto type_disk;
2499
2500 /*
2501 * XXX_12 is not defined in SSC, throw an exception
2502 */
e3d6f909
AG		 2503 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2504 *ret = -EINVAL;
c66ac9db
NB		 2505 return 0;
2506 }
2507
2508 /*
2509 * Everything else assume TYPE_DISK Sector CDB location.
2510 * Use 32-bit sector value.
2511 */
2512type_disk:
2513 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2514}
2515
2516static inline u32 transport_get_sectors_16(
2517 unsigned char *cdb,
2518 struct se_cmd *cmd,
2519 int *ret)
2520{
5951146d 2521 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2522
2523 /*
2524 * Assume TYPE_DISK for non struct se_device objects.
2525 * Use 32-bit sector value.
2526 */
2527 if (!dev)
2528 goto type_disk;
2529
2530 /*
2531 * Use 24-bit allocation length for TYPE_TAPE.
2532 */
e3d6f909 2533 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2534 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2535
2536type_disk:
2537 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2538 (cdb[12] << 8) + cdb[13];
2539}
2540
2541/*
2542 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2543 */
2544static inline u32 transport_get_sectors_32(
2545 unsigned char *cdb,
2546 struct se_cmd *cmd,
2547 int *ret)
2548{
2549 /*
2550 * Assume TYPE_DISK for non struct se_device objects.
2551 * Use 32-bit sector value.
2552 */
2553 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2554 (cdb[30] << 8) + cdb[31];
2555
2556}
2557
2558static inline u32 transport_get_size(
2559 u32 sectors,
2560 unsigned char *cdb,
2561 struct se_cmd *cmd)
2562{
5951146d 2563 struct se_device *dev = cmd->se_dev;
c66ac9db 2564
e3d6f909 2565 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2566 if (cdb[1] & 1) { /* sectors */
e3d6f909 2567 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2568 } else /* bytes */
2569 return sectors;
2570 }
2571#if 0
6708bb27 2572 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2573 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2574 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2575 dev->transport->name);
c66ac9db 2576#endif
e3d6f909 2577 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2578}
2579
c66ac9db
NB		 2580static void transport_xor_callback(struct se_cmd *cmd)
2581{
2582 unsigned char *buf, *addr;
ec98f782 2583 struct scatterlist *sg;
c66ac9db
NB		 2584 unsigned int offset;
2585 int i;
ec98f782 2586 int count;
c66ac9db
NB		 2587 /*
2588 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2589 *
2590 * 1) read the specified logical block(s);
2591 * 2) transfer logical blocks from the data-out buffer;
2592 * 3) XOR the logical blocks transferred from the data-out buffer with
2593 * the logical blocks read, storing the resulting XOR data in a buffer;
2594 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2595 * blocks transferred from the data-out buffer; and
2596 * 5) transfer the resulting XOR data to the data-in buffer.
2597 */
2598 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2599 if (!buf) {
2600 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2601 return;
2602 }
2603 /*
ec98f782 2604 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2605 * into the locally allocated *buf
2606 */
ec98f782
AG		 2607 sg_copy_to_buffer(cmd->t_data_sg,
2608 cmd->t_data_nents,
2609 buf,
2610 cmd->data_length);
2611
c66ac9db
NB		 2612 /*
2613 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2614 * cmd->t_mem_bidi_list
c66ac9db
NB		 2615 */
2616
2617 offset = 0;
ec98f782
AG		 2618 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2619 addr = kmap_atomic(sg_page(sg), KM_USER0);
2620 if (!addr)
c66ac9db
NB		 2621 goto out;
2622
ec98f782
AG		 2623 for (i = 0; i < sg->length; i++)
2624 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2625
ec98f782 2626 offset += sg->length;
c66ac9db
NB		 2627 kunmap_atomic(addr, KM_USER0);
2628 }
ec98f782 2629
c66ac9db
NB		 2630out:
2631 kfree(buf);
2632}
2633
2634/*
2635 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2636 */
2637static int transport_get_sense_data(struct se_cmd *cmd)
2638{
2639 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2640 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2641 struct se_task *task = NULL, *task_tmp;
2642 unsigned long flags;
2643 u32 offset = 0;
2644
e3d6f909
AG		 2645 WARN_ON(!cmd->se_lun);
2646
42bf829e
CH		 2647 if (!dev)
2648 return 0;
2649
a1d8b49a 2650 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2651 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2652 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2653 return 0;
2654 }
2655
2656 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2657 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2658 if (!task->task_sense)
2659 continue;
2660
e3d6f909 2661 if (!dev->transport->get_sense_buffer) {
6708bb27 2662 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2663 " is NULL\n");
2664 continue;
2665 }
2666
e3d6f909 2667 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2668 if (!sense_buffer) {
04629b7b 2669 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2670 " sense buffer for task with sense\n",
04629b7b 2671 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2672 continue;
2673 }
a1d8b49a 2674 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2675
e3d6f909 2676 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2677 TRANSPORT_SENSE_BUFFER);
2678
5951146d 2679 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2680 TRANSPORT_SENSE_BUFFER);
2681 cmd->scsi_status = task->task_scsi_status;
2682 /* Automatically padded */
2683 cmd->scsi_sense_length =
2684 (TRANSPORT_SENSE_BUFFER + offset);
2685
6708bb27 2686 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2687 " and sense\n",
e3d6f909 2688 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2689 cmd->scsi_status);
2690 return 0;
2691 }
a1d8b49a 2692 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2693
2694 return -1;
2695}
2696
c66ac9db
NB		 2697static int
2698transport_handle_reservation_conflict(struct se_cmd *cmd)
2699{
c66ac9db
NB		 2700 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2701 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2702 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2703 /*
2704 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2705 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2706 * CONFLICT STATUS.
2707 *
2708 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2709 */
e3d6f909
AG		 2710 if (cmd->se_sess &&
2711 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2712 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2713 cmd->orig_fe_lun, 0x2C,
2714 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2715 return -EINVAL;
c66ac9db
NB		 2716}
2717
ec98f782
AG		 2718static inline long long transport_dev_end_lba(struct se_device *dev)
2719{
2720 return dev->transport->get_blocks(dev) + 1;
2721}
2722
2723static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2724{
2725 struct se_device *dev = cmd->se_dev;
2726 u32 sectors;
2727
2728 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2729 return 0;
2730
2731 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2732
6708bb27
AG		 2733 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2734 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2735 " transport_dev_end_lba(): %llu\n",
2736 cmd->t_task_lba, sectors,
2737 transport_dev_end_lba(dev));
7abbe7f3 2738 return -EINVAL;
ec98f782
AG		 2739 }
2740
7abbe7f3 2741 return 0;
ec98f782
AG		 2742}
2743
706d5860
NB		 2744static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2745{
2746 /*
2747 * Determine if the received WRITE_SAME is used to for direct
2748 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2749 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2750 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2751 */
2752 int passthrough = (dev->transport->transport_type ==
2753 TRANSPORT_PLUGIN_PHBA_PDEV);
2754
2755 if (!passthrough) {
2756 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2757 pr_err("WRITE_SAME PBDATA and LBDATA"
2758 " bits not supported for Block Discard"
2759 " Emulation\n");
2760 return -ENOSYS;
2761 }
2762 /*
2763 * Currently for the emulated case we only accept
2764 * tpws with the UNMAP=1 bit set.
2765 */
2766 if (!(flags[0] & 0x08)) {
2767 pr_err("WRITE_SAME w/o UNMAP bit not"
2768 " supported for Block Discard Emulation\n");
2769 return -ENOSYS;
2770 }
2771 }
2772
2773 return 0;
2774}
2775
c66ac9db
NB		 2776/* transport_generic_cmd_sequencer():
2777 *
2778 * Generic Command Sequencer that should work for most DAS transport
2779 * drivers.
2780 *
2781 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2782 * RX Thread.
2783 *
2784 * FIXME: Need to support other SCSI OPCODES where as well.
2785 */
2786static int transport_generic_cmd_sequencer(
2787 struct se_cmd *cmd,
2788 unsigned char *cdb)
2789{
5951146d 2790 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2791 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2792 int ret = 0, sector_ret = 0, passthrough;
2793 u32 sectors = 0, size = 0, pr_reg_type = 0;
2794 u16 service_action;
2795 u8 alua_ascq = 0;
2796 /*
2797 * Check for an existing UNIT ATTENTION condition
2798 */
2799 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2800 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2801 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2802 return -EINVAL;
c66ac9db
NB		 2803 }
2804 /*
2805 * Check status of Asymmetric Logical Unit Assignment port
2806 */
e3d6f909 2807 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2808 if (ret != 0) {
c66ac9db 2809 /*
25985edc 2810 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2811 * The ALUA additional sense code qualifier (ASCQ) is determined
2812 * by the ALUA primary or secondary access state..
2813 */
2814 if (ret > 0) {
2815#if 0
6708bb27 2816 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2817 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2818 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2819#endif
2820 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2821 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2822 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2823 return -EINVAL;
c66ac9db
NB		 2824 }
2825 goto out_invalid_cdb_field;
2826 }
2827 /*
2828 * Check status for SPC-3 Persistent Reservations
2829 */
e3d6f909
AG		 2830 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2831 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2832 cmd, cdb, pr_reg_type) != 0)
2833 return transport_handle_reservation_conflict(cmd);
2834 /*
2835 * This means the CDB is allowed for the SCSI Initiator port
2836 * when said port is *NOT* holding the legacy SPC-2 or
2837 * SPC-3 Persistent Reservation.
2838 */
2839 }
2840
2841 switch (cdb[0]) {
2842 case READ_6:
2843 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2844 if (sector_ret)
2845 goto out_unsupported_cdb;
2846 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2847 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2848 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2849 break;
2850 case READ_10:
2851 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2852 if (sector_ret)
2853 goto out_unsupported_cdb;
2854 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2855 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2856 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2857 break;
2858 case READ_12:
2859 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2860 if (sector_ret)
2861 goto out_unsupported_cdb;
2862 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2863 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2864 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2865 break;
2866 case READ_16:
2867 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2868 if (sector_ret)
2869 goto out_unsupported_cdb;
2870 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2871 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2872 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2873 break;
2874 case WRITE_6:
2875 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2876 if (sector_ret)
2877 goto out_unsupported_cdb;
2878 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2879 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2880 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2881 break;
2882 case WRITE_10:
2883 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2884 if (sector_ret)
2885 goto out_unsupported_cdb;
2886 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2887 cmd->t_task_lba = transport_lba_32(cdb);
2888 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2889 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2890 break;
2891 case WRITE_12:
2892 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2893 if (sector_ret)
2894 goto out_unsupported_cdb;
2895 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2896 cmd->t_task_lba = transport_lba_32(cdb);
2897 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2898 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2899 break;
2900 case WRITE_16:
2901 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2902 if (sector_ret)
2903 goto out_unsupported_cdb;
2904 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2905 cmd->t_task_lba = transport_lba_64(cdb);
2906 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2907 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2908 break;
2909 case XDWRITEREAD_10:
2910 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 2911 !(cmd->t_tasks_bidi))
c66ac9db
NB		 2912 goto out_invalid_cdb_field;
2913 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2914 if (sector_ret)
2915 goto out_unsupported_cdb;
2916 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2917 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2918 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 2919 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2920 TRANSPORT_PLUGIN_PHBA_PDEV);
2921 /*
2922 * Skip the remaining assignments for TCM/PSCSI passthrough
2923 */
2924 if (passthrough)
2925 break;
2926 /*
2927 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2928 */
2929 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2930 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2931 break;
2932 case VARIABLE_LENGTH_CMD:
2933 service_action = get_unaligned_be16(&cdb[8]);
2934 /*
2935 * Determine if this is TCM/PSCSI device and we should disable
2936 * internal emulation for this CDB.
2937 */
e3d6f909 2938 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2939 TRANSPORT_PLUGIN_PHBA_PDEV);
2940
2941 switch (service_action) {
2942 case XDWRITEREAD_32:
2943 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2944 if (sector_ret)
2945 goto out_unsupported_cdb;
2946 size = transport_get_size(sectors, cdb, cmd);
2947 /*
2948 * Use WRITE_32 and READ_32 opcodes for the emulated
2949 * XDWRITE_READ_32 logic.
2950 */
a1d8b49a 2951 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2952 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2953
2954 /*
2955 * Skip the remaining assignments for TCM/PSCSI passthrough
2956 */
2957 if (passthrough)
2958 break;
2959
2960 /*
2961 * Setup BIDI XOR callback to be run during
2962 * transport_generic_complete_ok()
2963 */
2964 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2965 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 2966 break;
2967 case WRITE_SAME_32:
2968 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2969 if (sector_ret)
2970 goto out_unsupported_cdb;
dd3a5ad8 2971
6708bb27 2972 if (sectors)
12850626 2973 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2974 else {
2975 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2976 " supported\n");
2977 goto out_invalid_cdb_field;
2978 }
dd3a5ad8 2979
a1d8b49a 2980 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2981 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2982
706d5860 2983 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2984 goto out_invalid_cdb_field;
706d5860 2985
c66ac9db
NB		 2986 break;
2987 default:
6708bb27 2988 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2989 " 0x%04x not supported\n", service_action);
2990 goto out_unsupported_cdb;
2991 }
2992 break;
e434f1f1 2993 case MAINTENANCE_IN:
e3d6f909 2994 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2995 /* MAINTENANCE_IN from SCC-2 */
2996 /*
2997 * Check for emulated MI_REPORT_TARGET_PGS.
2998 */
2999 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3000 cmd->transport_emulate_cdb =
e3d6f909 3001 (su_dev->t10_alua.alua_type ==
c66ac9db 3002 SPC3_ALUA_EMULATED) ?
e3d6f909 3003 core_emulate_report_target_port_groups :
c66ac9db
NB		 3004 NULL;
3005 }
3006 size = (cdb[6] << 24) | (cdb[7] << 16) |
3007 (cdb[8] << 8) | cdb[9];
3008 } else {
3009 /* GPCMD_SEND_KEY from multi media commands */
3010 size = (cdb[8] << 8) + cdb[9];
3011 }
05d1c7c0 3012 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3013 break;
3014 case MODE_SELECT:
3015 size = cdb[4];
3016 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3017 break;
3018 case MODE_SELECT_10:
3019 size = (cdb[7] << 8) + cdb[8];
3020 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3021 break;
3022 case MODE_SENSE:
3023 size = cdb[4];
05d1c7c0 3024 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3025 break;
3026 case MODE_SENSE_10:
3027 case GPCMD_READ_BUFFER_CAPACITY:
3028 case GPCMD_SEND_OPC:
3029 case LOG_SELECT:
3030 case LOG_SENSE:
3031 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3032 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3033 break;
3034 case READ_BLOCK_LIMITS:
3035 size = READ_BLOCK_LEN;
05d1c7c0 3036 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3037 break;
3038 case GPCMD_GET_CONFIGURATION:
3039 case GPCMD_READ_FORMAT_CAPACITIES:
3040 case GPCMD_READ_DISC_INFO:
3041 case GPCMD_READ_TRACK_RZONE_INFO:
3042 size = (cdb[7] << 8) + cdb[8];
3043 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3044 break;
3045 case PERSISTENT_RESERVE_IN:
3046 case PERSISTENT_RESERVE_OUT:
3047 cmd->transport_emulate_cdb =
e3d6f909 3048 (su_dev->t10_pr.res_type ==
c66ac9db 3049 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3050 core_scsi3_emulate_pr : NULL;
c66ac9db 3051 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3052 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3053 break;
3054 case GPCMD_MECHANISM_STATUS:
3055 case GPCMD_READ_DVD_STRUCTURE:
3056 size = (cdb[8] << 8) + cdb[9];
3057 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3058 break;
3059 case READ_POSITION:
3060 size = READ_POSITION_LEN;
05d1c7c0 3061 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3062 break;
e434f1f1 3063 case MAINTENANCE_OUT:
e3d6f909 3064 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3065 /* MAINTENANCE_OUT from SCC-2
3066 *
3067 * Check for emulated MO_SET_TARGET_PGS.
3068 */
3069 if (cdb[1] == MO_SET_TARGET_PGS) {
3070 cmd->transport_emulate_cdb =
e3d6f909 3071 (su_dev->t10_alua.alua_type ==
c66ac9db 3072 SPC3_ALUA_EMULATED) ?
e3d6f909 3073 core_emulate_set_target_port_groups :
c66ac9db
NB		 3074 NULL;
3075 }
3076
3077 size = (cdb[6] << 24) | (cdb[7] << 16) |
3078 (cdb[8] << 8) | cdb[9];
3079 } else {
3080 /* GPCMD_REPORT_KEY from multi media commands */
3081 size = (cdb[8] << 8) + cdb[9];
3082 }
05d1c7c0 3083 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3084 break;
3085 case INQUIRY:
3086 size = (cdb[3] << 8) + cdb[4];
3087 /*
3088 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3089 * See spc4r17 section 5.3
3090 */
5951146d 3091 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3092 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3093 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3094 break;
3095 case READ_BUFFER:
3096 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3097 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3098 break;
3099 case READ_CAPACITY:
3100 size = READ_CAP_LEN;
05d1c7c0 3101 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3102 break;
3103 case READ_MEDIA_SERIAL_NUMBER:
3104 case SECURITY_PROTOCOL_IN:
3105 case SECURITY_PROTOCOL_OUT:
3106 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3107 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3108 break;
3109 case SERVICE_ACTION_IN:
3110 case ACCESS_CONTROL_IN:
3111 case ACCESS_CONTROL_OUT:
3112 case EXTENDED_COPY:
3113 case READ_ATTRIBUTE:
3114 case RECEIVE_COPY_RESULTS:
3115 case WRITE_ATTRIBUTE:
3116 size = (cdb[10] << 24) | (cdb[11] << 16) |
3117 (cdb[12] << 8) | cdb[13];
05d1c7c0 3118 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3119 break;
3120 case RECEIVE_DIAGNOSTIC:
3121 case SEND_DIAGNOSTIC:
3122 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3123 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3124 break;
3125/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3126#if 0
3127 case GPCMD_READ_CD:
3128 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3129 size = (2336 * sectors);
05d1c7c0 3130 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3131 break;
3132#endif
3133 case READ_TOC:
3134 size = cdb[8];
05d1c7c0 3135 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3136 break;
3137 case REQUEST_SENSE:
3138 size = cdb[4];
05d1c7c0 3139 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3140 break;
3141 case READ_ELEMENT_STATUS:
3142 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3143 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3144 break;
3145 case WRITE_BUFFER:
3146 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3147 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3148 break;
3149 case RESERVE:
3150 case RESERVE_10:
3151 /*
3152 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3153 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3154 */
3155 if (cdb[0] == RESERVE_10)
3156 size = (cdb[7] << 8) | cdb[8];
3157 else
3158 size = cmd->data_length;
3159
3160 /*
3161 * Setup the legacy emulated handler for SPC-2 and
3162 * >= SPC-3 compatible reservation handling (CRH=1)
3163 * Otherwise, we assume the underlying SCSI logic is
3164 * is running in SPC_PASSTHROUGH, and wants reservations
3165 * emulation disabled.
3166 */
3167 cmd->transport_emulate_cdb =
e3d6f909 3168 (su_dev->t10_pr.res_type !=
c66ac9db 3169 SPC_PASSTHROUGH) ?
e3d6f909 3170 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3171 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3172 break;
3173 case RELEASE:
3174 case RELEASE_10:
3175 /*
3176 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3177 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3178 */
3179 if (cdb[0] == RELEASE_10)
3180 size = (cdb[7] << 8) | cdb[8];
3181 else
3182 size = cmd->data_length;
3183
3184 cmd->transport_emulate_cdb =
e3d6f909 3185 (su_dev->t10_pr.res_type !=
c66ac9db 3186 SPC_PASSTHROUGH) ?
e3d6f909 3187 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3188 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3189 break;
3190 case SYNCHRONIZE_CACHE:
3191 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3192 /*
3193 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3194 */
3195 if (cdb[0] == SYNCHRONIZE_CACHE) {
3196 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3197 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3198 } else {
3199 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3200 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3201 }
3202 if (sector_ret)
3203 goto out_unsupported_cdb;
3204
3205 size = transport_get_size(sectors, cdb, cmd);
3206 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3207
3208 /*
3209 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3210 */
e3d6f909 3211 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3212 break;
3213 /*
3214 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3215 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3216 */
3217 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3218 /*
3219 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3220 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3221 */
7abbe7f3
NB		 3222 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3223 if (transport_cmd_get_valid_sectors(cmd) < 0)
3224 goto out_invalid_cdb_field;
3225 }
c66ac9db
NB		 3226 break;
3227 case UNMAP:
3228 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3229 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3230 break;
3231 case WRITE_SAME_16:
3232 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3233 if (sector_ret)
3234 goto out_unsupported_cdb;
dd3a5ad8 3235
6708bb27 3236 if (sectors)
12850626 3237 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3238 else {
3239 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3240 goto out_invalid_cdb_field;
3241 }
dd3a5ad8 3242
5db0753b 3243 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3244 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3245
3246 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3247 goto out_invalid_cdb_field;
3248 break;
3249 case WRITE_SAME:
3250 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3251 if (sector_ret)
3252 goto out_unsupported_cdb;
3253
3254 if (sectors)
12850626 3255 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3256 else {
3257 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3258 goto out_invalid_cdb_field;
c66ac9db 3259 }
706d5860
NB		 3260
3261 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3262 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3263 /*
3264 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3265 * of byte 1 bit 3 UNMAP instead of original reserved field
3266 */
3267 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3268 goto out_invalid_cdb_field;
c66ac9db
NB		 3269 break;
3270 case ALLOW_MEDIUM_REMOVAL:
3271 case GPCMD_CLOSE_TRACK:
3272 case ERASE:
3273 case INITIALIZE_ELEMENT_STATUS:
3274 case GPCMD_LOAD_UNLOAD:
3275 case REZERO_UNIT:
3276 case SEEK_10:
3277 case GPCMD_SET_SPEED:
3278 case SPACE:
3279 case START_STOP:
3280 case TEST_UNIT_READY:
3281 case VERIFY:
3282 case WRITE_FILEMARKS:
3283 case MOVE_MEDIUM:
3284 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3285 break;
3286 case REPORT_LUNS:
3287 cmd->transport_emulate_cdb =
e3d6f909 3288 transport_core_report_lun_response;
c66ac9db
NB		 3289 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3290 /*
3291 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3292 * See spc4r17 section 5.3
3293 */
5951146d 3294 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3295 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3296 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3297 break;
3298 default:
6708bb27 3299 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3300 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3301 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3302 goto out_unsupported_cdb;
3303 }
3304
3305 if (size != cmd->data_length) {
6708bb27 3306 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3307 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3308 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3309 cmd->data_length, size, cdb[0]);
3310
3311 cmd->cmd_spdtl = size;
3312
3313 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3314 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3315 " WRITE data\n");
3316 goto out_invalid_cdb_field;
3317 }
3318 /*
3319 * Reject READ_* or WRITE_* with overflow/underflow for
3320 * type SCF_SCSI_DATA_SG_IO_CDB.
3321 */
6708bb27
AG		 3322 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3323 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3324 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3325 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3326 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3327 goto out_invalid_cdb_field;
3328 }
3329
3330 if (size > cmd->data_length) {
3331 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3332 cmd->residual_count = (size - cmd->data_length);
3333 } else {
3334 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3335 cmd->residual_count = (cmd->data_length - size);
3336 }
3337 cmd->data_length = size;
3338 }
3339
d0229ae3
AG		 3340 /* Let's limit control cdbs to a page, for simplicity's sake. */
3341 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3342 size > PAGE_SIZE)
3343 goto out_invalid_cdb_field;
3344
c66ac9db
NB		 3345 transport_set_supported_SAM_opcode(cmd);
3346 return ret;
3347
3348out_unsupported_cdb:
3349 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3350 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3351 return -EINVAL;
c66ac9db
NB		 3352out_invalid_cdb_field:
3353 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3354 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3355 return -EINVAL;
c66ac9db
NB		 3356}
3357
c66ac9db
NB		 3358/*
3359 * Called from transport_generic_complete_ok() and
3360 * transport_generic_request_failure() to determine which dormant/delayed
3361 * and ordered cmds need to have their tasks added to the execution queue.
3362 */
3363static void transport_complete_task_attr(struct se_cmd *cmd)
3364{
5951146d 3365 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3366 struct se_cmd *cmd_p, *cmd_tmp;
3367 int new_active_tasks = 0;
3368
e66ecd50 3369 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3370 atomic_dec(&dev->simple_cmds);
3371 smp_mb__after_atomic_dec();
3372 dev->dev_cur_ordered_id++;
6708bb27 3373 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3374 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3375 cmd->se_ordered_id);
e66ecd50 3376 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3377 atomic_dec(&dev->dev_hoq_count);
3378 smp_mb__after_atomic_dec();
3379 dev->dev_cur_ordered_id++;
6708bb27 3380 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3381 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3382 cmd->se_ordered_id);
e66ecd50 3383 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3384 spin_lock(&dev->ordered_cmd_lock);
5951146d 3385 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3386 atomic_dec(&dev->dev_ordered_sync);
3387 smp_mb__after_atomic_dec();
3388 spin_unlock(&dev->ordered_cmd_lock);
3389
3390 dev->dev_cur_ordered_id++;
6708bb27 3391 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3392 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3393 }
3394 /*
3395 * Process all commands up to the last received
3396 * ORDERED task attribute which requires another blocking
3397 * boundary
3398 */
3399 spin_lock(&dev->delayed_cmd_lock);
3400 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3401 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3402
5951146d 3403 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3404 spin_unlock(&dev->delayed_cmd_lock);
3405
6708bb27 3406 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3407 " cmd_p: 0x%02x Task Attr: 0x%02x"
3408 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3409 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3410 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3411
3412 transport_add_tasks_from_cmd(cmd_p);
3413 new_active_tasks++;
3414
3415 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3416 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3417 break;
3418 }
3419 spin_unlock(&dev->delayed_cmd_lock);
3420 /*
3421 * If new tasks have become active, wake up the transport thread
3422 * to do the processing of the Active tasks.
3423 */
3424 if (new_active_tasks != 0)
e3d6f909 3425 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3426}
3427
e057f533 3428static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3429{
3430 int ret = 0;
3431
e057f533
CH		 3432 transport_stop_all_task_timers(cmd);
3433 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3434 transport_complete_task_attr(cmd);
3435
3436 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3437 ret = cmd->se_tfo->queue_status(cmd);
3438 if (ret)
3439 goto out;
3440 }
07bde79a
NB		 3441
3442 switch (cmd->data_direction) {
3443 case DMA_FROM_DEVICE:
3444 ret = cmd->se_tfo->queue_data_in(cmd);
3445 break;
3446 case DMA_TO_DEVICE:
ec98f782 3447 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3448 ret = cmd->se_tfo->queue_data_in(cmd);
3449 if (ret < 0)
e057f533 3450 break;
07bde79a
NB		 3451 }
3452 /* Fall through for DMA_TO_DEVICE */
3453 case DMA_NONE:
3454 ret = cmd->se_tfo->queue_status(cmd);
3455 break;
3456 default:
3457 break;
3458 }
3459
e057f533
CH		 3460out:
3461 if (ret < 0) {
3462 transport_handle_queue_full(cmd, cmd->se_dev);
3463 return;
3464 }
3465 transport_lun_remove_cmd(cmd);
3466 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3467}
3468
3469static void transport_handle_queue_full(
3470 struct se_cmd *cmd,
e057f533 3471 struct se_device *dev)
07bde79a
NB		 3472{
3473 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3474 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3475 atomic_inc(&dev->dev_qf_count);
3476 smp_mb__after_atomic_inc();
3477 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3478
3479 schedule_work(&cmd->se_dev->qf_work_queue);
3480}
3481
c66ac9db
NB		 3482static void transport_generic_complete_ok(struct se_cmd *cmd)
3483{
07bde79a 3484 int reason = 0, ret;
c66ac9db
NB		 3485 /*
3486 * Check if we need to move delayed/dormant tasks from cmds on the
3487 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3488 * Attribute.
3489 */
5951146d 3490 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3491 transport_complete_task_attr(cmd);
07bde79a
NB		 3492 /*
3493 * Check to schedule QUEUE_FULL work, or execute an existing
3494 * cmd->transport_qf_callback()
3495 */
3496 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3497 schedule_work(&cmd->se_dev->qf_work_queue);
3498
c66ac9db
NB		 3499 /*
3500 * Check if we need to retrieve a sense buffer from
3501 * the struct se_cmd in question.
3502 */
3503 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3504 if (transport_get_sense_data(cmd) < 0)
3505 reason = TCM_NON_EXISTENT_LUN;
3506
3507 /*
3508 * Only set when an struct se_task->task_scsi_status returned
3509 * a non GOOD status.
3510 */
3511 if (cmd->scsi_status) {
07bde79a 3512 ret = transport_send_check_condition_and_sense(
c66ac9db 3513 cmd, reason, 1);
07bde79a
NB		 3514 if (ret == -EAGAIN)
3515 goto queue_full;
3516
c66ac9db
NB		 3517 transport_lun_remove_cmd(cmd);
3518 transport_cmd_check_stop_to_fabric(cmd);
3519 return;
3520 }
3521 }
3522 /*
25985edc 3523 * Check for a callback, used by amongst other things
c66ac9db
NB		 3524 * XDWRITE_READ_10 emulation.
3525 */
3526 if (cmd->transport_complete_callback)
3527 cmd->transport_complete_callback(cmd);
3528
3529 switch (cmd->data_direction) {
3530 case DMA_FROM_DEVICE:
3531 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3532 if (cmd->se_lun->lun_sep) {
3533 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3534 cmd->data_length;
3535 }
3536 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3537
07bde79a
NB		 3538 ret = cmd->se_tfo->queue_data_in(cmd);
3539 if (ret == -EAGAIN)
3540 goto queue_full;
c66ac9db
NB		 3541 break;
3542 case DMA_TO_DEVICE:
3543 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3544 if (cmd->se_lun->lun_sep) {
3545 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3546 cmd->data_length;
3547 }
3548 spin_unlock(&cmd->se_lun->lun_sep_lock);
3549 /*
3550 * Check if we need to send READ payload for BIDI-COMMAND
3551 */
ec98f782 3552 if (cmd->t_bidi_data_sg) {
c66ac9db 3553 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3554 if (cmd->se_lun->lun_sep) {
3555 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3556 cmd->data_length;
3557 }
3558 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3559 ret = cmd->se_tfo->queue_data_in(cmd);
3560 if (ret == -EAGAIN)
3561 goto queue_full;
c66ac9db
NB		 3562 break;
3563 }
3564 /* Fall through for DMA_TO_DEVICE */
3565 case DMA_NONE:
07bde79a
NB		 3566 ret = cmd->se_tfo->queue_status(cmd);
3567 if (ret == -EAGAIN)
3568 goto queue_full;
c66ac9db
NB		 3569 break;
3570 default:
3571 break;
3572 }
3573
3574 transport_lun_remove_cmd(cmd);
3575 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3576 return;
3577
3578queue_full:
6708bb27 3579 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3580 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3581 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3582 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3583}
3584
3585static void transport_free_dev_tasks(struct se_cmd *cmd)
3586{
3587 struct se_task *task, *task_tmp;
3588 unsigned long flags;
3589
a1d8b49a 3590 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3591 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3592 &cmd->t_task_list, t_list) {
6c76bf95 3593 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 3594 continue;
3595
3596 kfree(task->task_sg_bidi);
3597 kfree(task->task_sg);
3598
3599 list_del(&task->t_list);
3600
a1d8b49a 3601 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
42bf829e 3602 cmd->se_dev->transport->free_task(task);
a1d8b49a 3603 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3604 }
a1d8b49a 3605 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3606}
3607
6708bb27 3608static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3609{
ec98f782 3610 struct scatterlist *sg;
ec98f782 3611 int count;
c66ac9db 3612
6708bb27
AG		 3613 for_each_sg(sgl, sg, nents, count)
3614 __free_page(sg_page(sg));
c66ac9db 3615
6708bb27
AG		 3616 kfree(sgl);
3617}
c66ac9db 3618
6708bb27
AG		 3619static inline void transport_free_pages(struct se_cmd *cmd)
3620{
3621 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3622 return;
3623
3624 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3625 cmd->t_data_sg = NULL;
3626 cmd->t_data_nents = 0;
c66ac9db 3627
6708bb27 3628 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3629 cmd->t_bidi_data_sg = NULL;
3630 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3631}
3632
d3df7825
CH		 3633/**
3634 * transport_put_cmd - release a reference to a command
3635 * @cmd: command to release
3636 *
3637 * This routine releases our reference to the command and frees it if possible.
3638 */
39c05f32 3639static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3640{
3641 unsigned long flags;
4911e3cc 3642 int free_tasks = 0;
c66ac9db 3643
a1d8b49a 3644 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3645 if (atomic_read(&cmd->t_fe_count)) {
3646 if (!atomic_dec_and_test(&cmd->t_fe_count))
3647 goto out_busy;
3648 }
3649
3650 if (atomic_read(&cmd->t_se_count)) {
3651 if (!atomic_dec_and_test(&cmd->t_se_count))
3652 goto out_busy;
3653 }
3654
3655 if (atomic_read(&cmd->transport_dev_active)) {
3656 atomic_set(&cmd->transport_dev_active, 0);
3657 transport_all_task_dev_remove_state(cmd);
3658 free_tasks = 1;
c66ac9db 3659 }
a1d8b49a 3660 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3661
4911e3cc
CH		 3662 if (free_tasks != 0)
3663 transport_free_dev_tasks(cmd);
d3df7825 3664
c66ac9db 3665 transport_free_pages(cmd);
31afc39c 3666 transport_release_cmd(cmd);
39c05f32 3667 return;
4911e3cc
CH		 3668out_busy:
3669 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3670}
3671
c66ac9db 3672/*
ec98f782
AG		 3673 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3674 * allocating in the core.
c66ac9db
NB		 3675 * @cmd: Associated se_cmd descriptor
3676 * @mem: SGL style memory for TCM WRITE / READ
3677 * @sg_mem_num: Number of SGL elements
3678 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3679 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3680 *
3681 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3682 * of parameters.
3683 */
3684int transport_generic_map_mem_to_cmd(
3685 struct se_cmd *cmd,
5951146d
AG		 3686 struct scatterlist *sgl,
3687 u32 sgl_count,
3688 struct scatterlist *sgl_bidi,
3689 u32 sgl_bidi_count)
c66ac9db 3690{
5951146d 3691 if (!sgl || !sgl_count)
c66ac9db 3692 return 0;
c66ac9db 3693
c66ac9db
NB		 3694 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3695 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3696
ec98f782
AG		 3697 cmd->t_data_sg = sgl;
3698 cmd->t_data_nents = sgl_count;
c66ac9db 3699
ec98f782
AG		 3700 if (sgl_bidi && sgl_bidi_count) {
3701 cmd->t_bidi_data_sg = sgl_bidi;
3702 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3703 }
3704 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3705 }
3706
3707 return 0;
3708}
3709EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3710
c66ac9db
NB		 3711static int transport_new_cmd_obj(struct se_cmd *cmd)
3712{
5951146d 3713 struct se_device *dev = cmd->se_dev;
01cde4d5 3714 int set_counts = 1, rc, task_cdbs;
c66ac9db 3715
ec98f782
AG		 3716 /*
3717 * Setup any BIDI READ tasks and memory from
3718 * cmd->t_mem_bidi_list so the READ struct se_tasks
3719 * are queued first for the non pSCSI passthrough case.
3720 */
3721 if (cmd->t_bidi_data_sg &&
3722 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3723 rc = transport_allocate_tasks(cmd,
3724 cmd->t_task_lba,
3725 DMA_FROM_DEVICE,
3726 cmd->t_bidi_data_sg,
3727 cmd->t_bidi_data_nents);
6708bb27 3728 if (rc <= 0) {
c66ac9db
NB		 3729 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3730 cmd->scsi_sense_reason =
ec98f782 3731 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3732 return -EINVAL;
c66ac9db 3733 }
ec98f782
AG		 3734 atomic_inc(&cmd->t_fe_count);
3735 atomic_inc(&cmd->t_se_count);
3736 set_counts = 0;
3737 }
3738 /*
3739 * Setup the tasks and memory from cmd->t_mem_list
3740 * Note for BIDI transfers this will contain the WRITE payload
3741 */
3742 task_cdbs = transport_allocate_tasks(cmd,
3743 cmd->t_task_lba,
3744 cmd->data_direction,
3745 cmd->t_data_sg,
3746 cmd->t_data_nents);
6708bb27 3747 if (task_cdbs <= 0) {
ec98f782
AG		 3748 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3749 cmd->scsi_sense_reason =
3750 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3751 return -EINVAL;
ec98f782 3752 }
c66ac9db 3753
ec98f782
AG		 3754 if (set_counts) {
3755 atomic_inc(&cmd->t_fe_count);
3756 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 3757 }
3758
ec98f782
AG		 3759 cmd->t_task_list_num = task_cdbs;
3760
a1d8b49a
AG		 3761 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3762 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3763 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 3764 return 0;
3765}
3766
05d1c7c0
AG		 3767void *transport_kmap_first_data_page(struct se_cmd *cmd)
3768{
ec98f782 3769 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3770
ec98f782 3771 BUG_ON(!sg);
05d1c7c0 3772 /*
ec98f782
AG		 3773 * We need to take into account a possible offset here for fabrics like
3774 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3775 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3776 */
ec98f782 3777 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3778}
3779EXPORT_SYMBOL(transport_kmap_first_data_page);
3780
3781void transport_kunmap_first_data_page(struct se_cmd *cmd)
3782{
ec98f782 3783 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3784}
3785EXPORT_SYMBOL(transport_kunmap_first_data_page);
3786
c66ac9db 3787static int
05d1c7c0 3788transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3789{
ec98f782
AG		 3790 u32 length = cmd->data_length;
3791 unsigned int nents;
3792 struct page *page;
3793 int i = 0;
c66ac9db 3794
ec98f782
AG		 3795 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3796 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3797 if (!cmd->t_data_sg)
3798 return -ENOMEM;
c66ac9db 3799
ec98f782
AG		 3800 cmd->t_data_nents = nents;
3801 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3802
ec98f782
AG		 3803 while (length) {
3804 u32 page_len = min_t(u32, length, PAGE_SIZE);
3805 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3806 if (!page)
3807 goto out;
c66ac9db 3808
ec98f782
AG		 3809 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3810 length -= page_len;
3811 i++;
c66ac9db 3812 }
c66ac9db 3813 return 0;
c66ac9db 3814
ec98f782
AG		 3815out:
3816 while (i >= 0) {
3817 __free_page(sg_page(&cmd->t_data_sg[i]));
3818 i--;
c66ac9db 3819 }
ec98f782
AG		 3820 kfree(cmd->t_data_sg);
3821 cmd->t_data_sg = NULL;
3822 return -ENOMEM;
c66ac9db
NB		 3823}
3824
a1d8b49a
AG		 3825/* Reduce sectors if they are too long for the device */
3826static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3827 struct se_device *dev,
3828 unsigned long long lba,
a1d8b49a 3829 sector_t sectors)
c66ac9db 3830{
a1d8b49a 3831 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3832
a1d8b49a
AG		 3833 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3834 if ((lba + sectors) > transport_dev_end_lba(dev))
3835 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3836
a1d8b49a 3837 return sectors;
c66ac9db
NB		 3838}
3839
c66ac9db
NB		 3840
3841/*
3842 * This function can be used by HW target mode drivers to create a linked
3843 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3844 * This is intended to be called during the completion path by TCM Core
3845 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3846 */
3847void transport_do_task_sg_chain(struct se_cmd *cmd)
3848{
ec98f782
AG		 3849 struct scatterlist *sg_first = NULL;
3850 struct scatterlist *sg_prev = NULL;
3851 int sg_prev_nents = 0;
3852 struct scatterlist *sg;
c66ac9db 3853 struct se_task *task;
ec98f782 3854 u32 chained_nents = 0;
c66ac9db
NB		 3855 int i;
3856
ec98f782
AG		 3857 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3858
c66ac9db
NB		 3859 /*
3860 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3861 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3862 */
a1d8b49a 3863 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3864 if (!task->task_sg)
c66ac9db
NB		 3865 continue;
3866
ec98f782
AG		 3867 if (!sg_first) {
3868 sg_first = task->task_sg;
6708bb27 3869 chained_nents = task->task_sg_nents;
97868c89 3870 } else {
ec98f782 3871 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3872 chained_nents += task->task_sg_nents;
97868c89 3873 }
c3c74c7a
NB		 3874 /*
3875 * For the padded tasks, use the extra SGL vector allocated
3876 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3877 * offset into sg_chain() above.
3878 *
3879 * We do not need the padding for the last task (or a single
3880 * task), but in that case we will never use the sg_prev_nents
3881 * value below which would be incorrect.
c3c74c7a 3882 */
04629b7b 3883 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3884 sg_prev = task->task_sg;
c66ac9db
NB		 3885 }
3886 /*
3887 * Setup the starting pointer and total t_tasks_sg_linked_no including
3888 * padding SGs for linking and to mark the end.
3889 */
a1d8b49a 3890 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3891 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3892
6708bb27 3893 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3894 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3895 cmd->t_tasks_sg_chained_no);
c66ac9db 3896
a1d8b49a
AG		 3897 for_each_sg(cmd->t_tasks_sg_chained, sg,
3898 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3899
6708bb27 3900 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3901 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3902 if (sg_is_chain(sg))
6708bb27 3903 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3904 if (sg_is_last(sg))
6708bb27 3905 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3906 }
c66ac9db
NB		 3907}
3908EXPORT_SYMBOL(transport_do_task_sg_chain);
3909
a1d8b49a
AG		 3910/*
3911 * Break up cmd into chunks transport can handle
3912 */
ec98f782 3913static int transport_allocate_data_tasks(
c66ac9db
NB		 3914 struct se_cmd *cmd,
3915 unsigned long long lba,
c66ac9db 3916 enum dma_data_direction data_direction,
ec98f782
AG		 3917 struct scatterlist *sgl,
3918 unsigned int sgl_nents)
c66ac9db 3919{
c66ac9db 3920 struct se_task *task;
5951146d 3921 struct se_device *dev = cmd->se_dev;
ec98f782 3922 unsigned long flags;
a3eedc22 3923 int task_count, i;
277c5f27 3924 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
ec98f782
AG		 3925 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3926 struct scatterlist *sg;
3927 struct scatterlist *cmd_sg;
a1d8b49a 3928
ec98f782
AG		 3929 WARN_ON(cmd->data_length % sector_size);
3930 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27
NB		 3931 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3932
ec98f782
AG		 3933 cmd_sg = sgl;
3934 for (i = 0; i < task_count; i++) {
c3c74c7a 3935 unsigned int task_size, task_sg_nents_padded;
ec98f782 3936 int count;
a1d8b49a 3937
c66ac9db 3938 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3939 if (!task)
ec98f782 3940 return -ENOMEM;
c66ac9db 3941
c66ac9db 3942 task->task_lba = lba;
ec98f782
AG		 3943 task->task_sectors = min(sectors, dev_max_sectors);
3944 task->task_size = task->task_sectors * sector_size;
c66ac9db 3945
525a48a2
NB		 3946 /*
3947 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3948 * in order to calculate the number per task SGL entries
3949 */
3950 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3951 /*
ec98f782
AG		 3952 * Check if the fabric module driver is requesting that all
3953 * struct se_task->task_sg[] be chained together.. If so,
3954 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3955 * marking the end of the chained SGL for every task except
3956 * the last one for (task_count > 1) operation, or skipping
3957 * the extra padding for the (task_count == 1) case.
c66ac9db 3958 */
c3c74c7a
NB		 3959 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3960 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3961 } else
3962 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3963
1d20bb61 3964 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3965 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3966 if (!task->task_sg) {
3967 cmd->se_dev->transport->free_task(task);
3968 return -ENOMEM;
3969 }
3970
c3c74c7a 3971 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3972
ec98f782
AG		 3973 task_size = task->task_size;
3974
3975 /* Build new sgl, only up to task_size */
6708bb27 3976 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3977 if (cmd_sg->length > task_size)
3978 break;
3979
3980 *sg = *cmd_sg;
3981 task_size -= cmd_sg->length;
3982 cmd_sg = sg_next(cmd_sg);
c66ac9db 3983 }
c66ac9db 3984
ec98f782
AG		 3985 lba += task->task_sectors;
3986 sectors -= task->task_sectors;
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
NB		 3991 }
3992
ec98f782 3993 return task_count;
c66ac9db
NB		 3994}
3995
3996static int
ec98f782 3997transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3998{
c66ac9db 3999 struct se_task *task;
ec98f782 4000 unsigned long flags;
c66ac9db
NB		 4001
4002 task = transport_generic_get_task(cmd, cmd->data_direction);
4003 if (!task)
ec98f782 4004 return -ENOMEM;
c66ac9db 4005
ec98f782
AG		 4006 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4007 GFP_KERNEL);
4008 if (!task->task_sg) {
4009 cmd->se_dev->transport->free_task(task);
4010 return -ENOMEM;
4011 }
4012
4013 memcpy(task->task_sg, cmd->t_data_sg,
4014 sizeof(struct scatterlist) * cmd->t_data_nents);
c66ac9db 4015 task->task_size = cmd->data_length;
6708bb27 4016 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 4017
ec98f782
AG		 4018 spin_lock_irqsave(&cmd->t_state_lock, flags);
4019 list_add_tail(&task->t_list, &cmd->t_task_list);
4020 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4021
6708bb27 4022 /* Success! Return number of tasks allocated */
a3eedc22 4023 return 1;
ec98f782
AG		 4024}
4025
4026static u32 transport_allocate_tasks(
4027 struct se_cmd *cmd,
4028 unsigned long long lba,
4029 enum dma_data_direction data_direction,
4030 struct scatterlist *sgl,
4031 unsigned int sgl_nents)
4032{
01cde4d5
NB		 4033 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4034 if (transport_cmd_get_valid_sectors(cmd) < 0)
4035 return -EINVAL;
4036
ec98f782
AG		 4037 return transport_allocate_data_tasks(cmd, lba, data_direction,
4038 sgl, sgl_nents);
01cde4d5 4039 } else
6708bb27
AG		 4040 return transport_allocate_control_task(cmd);
4041
c66ac9db
NB		 4042}
4043
ec98f782 4044
c66ac9db
NB		 4045/* transport_generic_new_cmd(): Called from transport_processing_thread()
4046 *
4047 * Allocate storage transport resources from a set of values predefined
4048 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4049 * Any non zero return here is treated as an "out of resource' op here.
4050 */
4051 /*
4052 * Generate struct se_task(s) and/or their payloads for this CDB.
4053 */
a1d8b49a 4054int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4055{
c66ac9db
NB		 4056 int ret = 0;
4057
4058 /*
4059 * Determine is the TCM fabric module has already allocated physical
4060 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 4061 * beforehand.
c66ac9db 4062 */
ec98f782
AG		 4063 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4064 cmd->data_length) {
05d1c7c0 4065 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4066 if (ret < 0)
4067 return ret;
4068 }
1d20bb61
NB		 4069 /*
4070 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4071 * control or data CDB types, and perform the map to backend subsystem
4072 * code from SGL memory allocated here by transport_generic_get_mem(), or
4073 * via pre-existing SGL memory setup explictly by fabric module code with
4074 * transport_generic_map_mem_to_cmd().
4075 */
c66ac9db
NB		 4076 ret = transport_new_cmd_obj(cmd);
4077 if (ret < 0)
4078 return ret;
c66ac9db 4079 /*
a1d8b49a 4080 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4081 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4082 * will be added to the struct se_device execution queue after its WRITE
4083 * data has arrived. (ie: It gets handled by the transport processing
4084 * thread a second time)
4085 */
4086 if (cmd->data_direction == DMA_TO_DEVICE) {
4087 transport_add_tasks_to_state_queue(cmd);
4088 return transport_generic_write_pending(cmd);
4089 }
4090 /*
4091 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4092 * to the execution queue.
4093 */
4094 transport_execute_tasks(cmd);
4095 return 0;
4096}
a1d8b49a 4097EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4098
4099/* transport_generic_process_write():
4100 *
4101 *
4102 */
4103void transport_generic_process_write(struct se_cmd *cmd)
4104{
c66ac9db
NB		 4105 transport_execute_tasks(cmd);
4106}
4107EXPORT_SYMBOL(transport_generic_process_write);
4108
e057f533 4109static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 4110{
e057f533
CH		 4111 if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
4112 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4113 cmd);
4114 transport_handle_queue_full(cmd, cmd->se_dev);
4115 }
07bde79a
NB		 4116}
4117
c66ac9db
NB		 4118static int transport_generic_write_pending(struct se_cmd *cmd)
4119{
4120 unsigned long flags;
4121 int ret;
4122
a1d8b49a 4123 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4124 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4125 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 4126
c66ac9db
NB		 4127 /*
4128 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4129 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4130 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4131 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4132 * because the se_cmd->se_lun pointer is not being cleared.
4133 */
4134 transport_cmd_check_stop(cmd, 1, 0);
4135
4136 /*
4137 * Call the fabric write_pending function here to let the
4138 * frontend know that WRITE buffers are ready.
4139 */
e3d6f909 4140 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 4141 if (ret == -EAGAIN)
4142 goto queue_full;
4143 else if (ret < 0)
c66ac9db
NB		 4144 return ret;
4145
4146 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 4147
4148queue_full:
6708bb27 4149 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 4150 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 4151 transport_handle_queue_full(cmd, cmd->se_dev);
07bde79a 4152 return ret;
c66ac9db
NB		 4153}
4154
2dbc43d2
CH		 4155/**
4156 * transport_release_cmd - free a command
4157 * @cmd: command to free
4158 *
4159 * This routine unconditionally frees a command, and reference counting
4160 * or list removal must be done in the caller.
4161 */
35462975 4162void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4163{
e3d6f909 4164 BUG_ON(!cmd->se_tfo);
c66ac9db 4165
2dbc43d2
CH		 4166 if (cmd->se_tmr_req)
4167 core_tmr_release_req(cmd->se_tmr_req);
4168 if (cmd->t_task_cdb != cmd->__t_task_cdb)
4169 kfree(cmd->t_task_cdb);
35462975 4170 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4171}
35462975 4172EXPORT_SYMBOL(transport_release_cmd);
c66ac9db 4173
39c05f32 4174void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 4175{
d14921d6
NB		 4176 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
4177 if (wait_for_tasks && cmd->se_tmr_req)
4178 transport_wait_for_tasks(cmd);
4179
35462975 4180 transport_release_cmd(cmd);
d14921d6
NB		 4181 } else {
4182 if (wait_for_tasks)
4183 transport_wait_for_tasks(cmd);
4184
c66ac9db
NB		 4185 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4186
82f1c8a4 4187 if (cmd->se_lun)
c66ac9db 4188 transport_lun_remove_cmd(cmd);
c66ac9db 4189
f4366772
NB		 4190 transport_free_dev_tasks(cmd);
4191
39c05f32 4192 transport_put_cmd(cmd);
c66ac9db
NB		 4193 }
4194}
4195EXPORT_SYMBOL(transport_generic_free_cmd);
4196
c66ac9db
NB		 4197/* transport_lun_wait_for_tasks():
4198 *
4199 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4200 * an struct se_lun to be successfully shutdown.
4201 */
4202static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4203{
4204 unsigned long flags;
4205 int ret;
4206 /*
4207 * If the frontend has already requested this struct se_cmd to
4208 * be stopped, we can safely ignore this struct se_cmd.
4209 */
a1d8b49a
AG		 4210 spin_lock_irqsave(&cmd->t_state_lock, flags);
4211 if (atomic_read(&cmd->t_transport_stop)) {
4212 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4213 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4214 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4215 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4216 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4217 return -EPERM;
c66ac9db 4218 }
a1d8b49a
AG		 4219 atomic_set(&cmd->transport_lun_fe_stop, 1);
4220 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4221
5951146d 4222 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4223
4224 ret = transport_stop_tasks_for_cmd(cmd);
4225
6708bb27
AG		 4226 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4227 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4228 if (!ret) {
6708bb27 4229 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4230 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4231 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4232 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4233 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4234 }
5951146d 4235 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 4236
4237 return 0;
4238}
4239
c66ac9db
NB		 4240static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4241{
4242 struct se_cmd *cmd = NULL;
4243 unsigned long lun_flags, cmd_flags;
4244 /*
4245 * Do exception processing and return CHECK_CONDITION status to the
4246 * Initiator Port.
4247 */
4248 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4249 while (!list_empty(&lun->lun_cmd_list)) {
4250 cmd = list_first_entry(&lun->lun_cmd_list,
4251 struct se_cmd, se_lun_node);
4252 list_del(&cmd->se_lun_node);
4253
a1d8b49a 4254 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4255 /*
4256 * This will notify iscsi_target_transport.c:
4257 * transport_cmd_check_stop() that a LUN shutdown is in
4258 * progress for the iscsi_cmd_t.
4259 */
a1d8b49a 4260 spin_lock(&cmd->t_state_lock);
6708bb27 4261 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4262 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4263 cmd->se_lun->unpacked_lun,
4264 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4265 atomic_set(&cmd->transport_lun_stop, 1);
4266 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4267
4268 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4269
6708bb27
AG		 4270 if (!cmd->se_lun) {
4271 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4272 cmd->se_tfo->get_task_tag(cmd),
4273 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4274 BUG();
4275 }
4276 /*
4277 * If the Storage engine still owns the iscsi_cmd_t, determine
4278 * and/or stop its context.
4279 */
6708bb27 4280 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4281 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4282 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4283
e3d6f909 4284 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4285 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4286 continue;
4287 }
4288
6708bb27 4289 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4290 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4291 cmd->se_lun->unpacked_lun,
4292 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4293
a1d8b49a 4294 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4295 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4296 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4297 goto check_cond;
4298 }
a1d8b49a 4299 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4300 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4301 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4302
4303 transport_free_dev_tasks(cmd);
4304 /*
4305 * The Storage engine stopped this struct se_cmd before it was
4306 * send to the fabric frontend for delivery back to the
4307 * Initiator Node. Return this SCSI CDB back with an
4308 * CHECK_CONDITION status.
4309 */
4310check_cond:
4311 transport_send_check_condition_and_sense(cmd,
4312 TCM_NON_EXISTENT_LUN, 0);
4313 /*
4314 * If the fabric frontend is waiting for this iscsi_cmd_t to
4315 * be released, notify the waiting thread now that LU has
4316 * finished accessing it.
4317 */
a1d8b49a
AG		 4318 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4319 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4320 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4321 " struct se_cmd: %p ITT: 0x%08x\n",
4322 lun->unpacked_lun,
e3d6f909 4323 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4324
a1d8b49a 4325 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4326 cmd_flags);
4327 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4328 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4329 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4330 continue;
4331 }
6708bb27 4332 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4333 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4334
a1d8b49a 4335 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4336 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4337 }
4338 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4339}
4340
4341static int transport_clear_lun_thread(void *p)
4342{
4343 struct se_lun *lun = (struct se_lun *)p;
4344
4345 __transport_clear_lun_from_sessions(lun);
4346 complete(&lun->lun_shutdown_comp);
4347
4348 return 0;
4349}
4350
4351int transport_clear_lun_from_sessions(struct se_lun *lun)
4352{
4353 struct task_struct *kt;
4354
5951146d 4355 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4356 "tcm_cl_%u", lun->unpacked_lun);
4357 if (IS_ERR(kt)) {
6708bb27 4358 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4359 return PTR_ERR(kt);
c66ac9db
NB		 4360 }
4361 wait_for_completion(&lun->lun_shutdown_comp);
4362
4363 return 0;
4364}
4365
d14921d6
NB		 4366/**
4367 * transport_wait_for_tasks - wait for completion to occur
4368 * @cmd: command to wait
c66ac9db 4369 *
d14921d6
NB		 4370 * Called from frontend fabric context to wait for storage engine
4371 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4372 */
d14921d6 4373void transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4374{
4375 unsigned long flags;
4376
a1d8b49a 4377 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4378 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4379 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4380 return;
4381 }
4382 /*
4383 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4384 * has been set in transport_set_supported_SAM_opcode().
4385 */
4386 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4387 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4388 return;
4389 }
c66ac9db
NB		 4390 /*
4391 * If we are already stopped due to an external event (ie: LUN shutdown)
4392 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4393 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4394 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4395 * has completed its operation on the struct se_cmd.
4396 */
a1d8b49a 4397 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4398
6708bb27 4399 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4400 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4401 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4402 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4403 /*
4404 * There is a special case for WRITES where a FE exception +
4405 * LUN shutdown means ConfigFS context is still sleeping on
4406 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4407 * We go ahead and up transport_lun_stop_comp just to be sure
4408 * here.
4409 */
a1d8b49a
AG		 4410 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4411 complete(&cmd->transport_lun_stop_comp);
4412 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4413 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4414
4415 transport_all_task_dev_remove_state(cmd);
4416 /*
4417 * At this point, the frontend who was the originator of this
4418 * struct se_cmd, now owns the structure and can be released through
4419 * normal means below.
4420 */
6708bb27 4421 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4422 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4423 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4424 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4425
a1d8b49a 4426 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4427 }
a1d8b49a 4428 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4429 atomic_read(&cmd->t_transport_aborted)) {
4430 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4431 return;
4432 }
c66ac9db 4433
a1d8b49a 4434 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4435
6708bb27 4436 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
c66ac9db 4437 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
e3d6f909
AG		 4438 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4439 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
c66ac9db
NB		 4440 cmd->deferred_t_state);
4441
a1d8b49a 4442 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4443
5951146d 4444 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4445
a1d8b49a 4446 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4447
a1d8b49a
AG		 4448 spin_lock_irqsave(&cmd->t_state_lock, flags);
4449 atomic_set(&cmd->t_transport_active, 0);
4450 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4451
6708bb27 4452 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4453 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4454 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4455
d14921d6 4456 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4457}
d14921d6 4458EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4459
4460static int transport_get_sense_codes(
4461 struct se_cmd *cmd,
4462 u8 *asc,
4463 u8 *ascq)
4464{
4465 *asc = cmd->scsi_asc;
4466 *ascq = cmd->scsi_ascq;
4467
4468 return 0;
4469}
4470
4471static int transport_set_sense_codes(
4472 struct se_cmd *cmd,
4473 u8 asc,
4474 u8 ascq)
4475{
4476 cmd->scsi_asc = asc;
4477 cmd->scsi_ascq = ascq;
4478
4479 return 0;
4480}
4481
4482int transport_send_check_condition_and_sense(
4483 struct se_cmd *cmd,
4484 u8 reason,
4485 int from_transport)
4486{
4487 unsigned char *buffer = cmd->sense_buffer;
4488 unsigned long flags;
4489 int offset;
4490 u8 asc = 0, ascq = 0;
4491
a1d8b49a 4492 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4493 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4494 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4495 return 0;
4496 }
4497 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4498 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4499
4500 if (!reason && from_transport)
4501 goto after_reason;
4502
4503 if (!from_transport)
4504 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4505 /*
4506 * Data Segment and SenseLength of the fabric response PDU.
4507 *
4508 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4509 * from include/scsi/scsi_cmnd.h
4510 */
e3d6f909 4511 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4512 TRANSPORT_SENSE_BUFFER);
4513 /*
4514 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4515 * SENSE KEY values from include/scsi/scsi.h
4516 */
4517 switch (reason) {
4518 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4519 /* CURRENT ERROR */
4520 buffer[offset] = 0x70;
4521 /* ILLEGAL REQUEST */
4522 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4523 /* LOGICAL UNIT NOT SUPPORTED */
4524 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4525 break;
c66ac9db
NB		 4526 case TCM_UNSUPPORTED_SCSI_OPCODE:
4527 case TCM_SECTOR_COUNT_TOO_MANY:
4528 /* CURRENT ERROR */
4529 buffer[offset] = 0x70;
4530 /* ILLEGAL REQUEST */
4531 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4532 /* INVALID COMMAND OPERATION CODE */
4533 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4534 break;
4535 case TCM_UNKNOWN_MODE_PAGE:
4536 /* CURRENT ERROR */
4537 buffer[offset] = 0x70;
4538 /* ILLEGAL REQUEST */
4539 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4540 /* INVALID FIELD IN CDB */
4541 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4542 break;
4543 case TCM_CHECK_CONDITION_ABORT_CMD:
4544 /* CURRENT ERROR */
4545 buffer[offset] = 0x70;
4546 /* ABORTED COMMAND */
4547 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4548 /* BUS DEVICE RESET FUNCTION OCCURRED */
4549 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4550 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4551 break;
4552 case TCM_INCORRECT_AMOUNT_OF_DATA:
4553 /* CURRENT ERROR */
4554 buffer[offset] = 0x70;
4555 /* ABORTED COMMAND */
4556 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4557 /* WRITE ERROR */
4558 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4559 /* NOT ENOUGH UNSOLICITED DATA */
4560 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4561 break;
4562 case TCM_INVALID_CDB_FIELD:
4563 /* CURRENT ERROR */
4564 buffer[offset] = 0x70;
4565 /* ABORTED COMMAND */
4566 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4567 /* INVALID FIELD IN CDB */
4568 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4569 break;
4570 case TCM_INVALID_PARAMETER_LIST:
4571 /* CURRENT ERROR */
4572 buffer[offset] = 0x70;
4573 /* ABORTED COMMAND */
4574 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4575 /* INVALID FIELD IN PARAMETER LIST */
4576 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4577 break;
4578 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4579 /* CURRENT ERROR */
4580 buffer[offset] = 0x70;
4581 /* ABORTED COMMAND */
4582 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4583 /* WRITE ERROR */
4584 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4585 /* UNEXPECTED_UNSOLICITED_DATA */
4586 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4587 break;
4588 case TCM_SERVICE_CRC_ERROR:
4589 /* CURRENT ERROR */
4590 buffer[offset] = 0x70;
4591 /* ABORTED COMMAND */
4592 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4593 /* PROTOCOL SERVICE CRC ERROR */
4594 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4595 /* N/A */
4596 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4597 break;
4598 case TCM_SNACK_REJECTED:
4599 /* CURRENT ERROR */
4600 buffer[offset] = 0x70;
4601 /* ABORTED COMMAND */
4602 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4603 /* READ ERROR */
4604 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4605 /* FAILED RETRANSMISSION REQUEST */
4606 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4607 break;
4608 case TCM_WRITE_PROTECTED:
4609 /* CURRENT ERROR */
4610 buffer[offset] = 0x70;
4611 /* DATA PROTECT */
4612 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4613 /* WRITE PROTECTED */
4614 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4615 break;
4616 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4617 /* CURRENT ERROR */
4618 buffer[offset] = 0x70;
4619 /* UNIT ATTENTION */
4620 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4621 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4622 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4623 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4624 break;
4625 case TCM_CHECK_CONDITION_NOT_READY:
4626 /* CURRENT ERROR */
4627 buffer[offset] = 0x70;
4628 /* Not Ready */
4629 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4630 transport_get_sense_codes(cmd, &asc, &ascq);
4631 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4632 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4633 break;
4634 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4635 default:
4636 /* CURRENT ERROR */
4637 buffer[offset] = 0x70;
4638 /* ILLEGAL REQUEST */
4639 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4640 /* LOGICAL UNIT COMMUNICATION FAILURE */
4641 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4642 break;
4643 }
4644 /*
4645 * This code uses linux/include/scsi/scsi.h SAM status codes!
4646 */
4647 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4648 /*
4649 * Automatically padded, this value is encoded in the fabric's
4650 * data_length response PDU containing the SCSI defined sense data.
4651 */
4652 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4653
4654after_reason:
07bde79a 4655 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4656}
4657EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4658
4659int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4660{
4661 int ret = 0;
4662
a1d8b49a 4663 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4664 if (!send_status ||
c66ac9db
NB		 4665 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4666 return 1;
4667#if 0
6708bb27 4668 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4669 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4670 cmd->t_task_cdb[0],
e3d6f909 4671 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4672#endif
4673 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4674 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4675 ret = 1;
4676 }
4677 return ret;
4678}
4679EXPORT_SYMBOL(transport_check_aborted_status);
4680
4681void transport_send_task_abort(struct se_cmd *cmd)
4682{
c252f003
NB		 4683 unsigned long flags;
4684
4685 spin_lock_irqsave(&cmd->t_state_lock, flags);
4686 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4687 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4688 return;
4689 }
4690 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4691
c66ac9db
NB		 4692 /*
4693 * If there are still expected incoming fabric WRITEs, we wait
4694 * until until they have completed before sending a TASK_ABORTED
4695 * response. This response with TASK_ABORTED status will be
4696 * queued back to fabric module by transport_check_aborted_status().
4697 */
4698 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4699 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4700 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4701 smp_mb__after_atomic_inc();
4702 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4703 transport_new_cmd_failure(cmd);
4704 return;
4705 }
4706 }
4707 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4708#if 0
6708bb27 4709 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4710 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4711 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4712#endif
e3d6f909 4713 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4714}
4715
4716/* transport_generic_do_tmr():
4717 *
4718 *
4719 */
4720int transport_generic_do_tmr(struct se_cmd *cmd)
4721{
5951146d 4722 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4723 struct se_tmr_req *tmr = cmd->se_tmr_req;
4724 int ret;
4725
4726 switch (tmr->function) {
5c6cd613 4727 case TMR_ABORT_TASK:
c66ac9db
NB		 4728 tmr->response = TMR_FUNCTION_REJECTED;
4729 break;
5c6cd613
NB		 4730 case TMR_ABORT_TASK_SET:
4731 case TMR_CLEAR_ACA:
4732 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4733 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4734 break;
5c6cd613 4735 case TMR_LUN_RESET:
c66ac9db
NB		 4736 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4737 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4738 TMR_FUNCTION_REJECTED;
4739 break;
5c6cd613 4740 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4741 tmr->response = TMR_FUNCTION_REJECTED;
4742 break;
5c6cd613 4743 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4744 tmr->response = TMR_FUNCTION_REJECTED;
4745 break;
c66ac9db 4746 default:
6708bb27 4747 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4748 tmr->function);
4749 tmr->response = TMR_FUNCTION_REJECTED;
4750 break;
4751 }
4752
4753 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4754 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db
NB		 4755
4756 transport_cmd_check_stop(cmd, 2, 0);
4757 return 0;
4758}
4759
c66ac9db
NB		 4760/* transport_processing_thread():
4761 *
4762 *
4763 */
4764static int transport_processing_thread(void *param)
4765{
5951146d 4766 int ret;
c66ac9db
NB		 4767 struct se_cmd *cmd;
4768 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 4769
4770 set_user_nice(current, -20);
4771
4772 while (!kthread_should_stop()) {
e3d6f909
AG		 4773 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4774 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4775 kthread_should_stop());
4776 if (ret < 0)
4777 goto out;
4778
c66ac9db
NB		 4779get_cmd:
4780 __transport_execute_tasks(dev);
4781
5951146d
AG		 4782 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4783 if (!cmd)
c66ac9db
NB		 4784 continue;
4785
5951146d 4786 switch (cmd->t_state) {
680b73c5
CH		 4787 case TRANSPORT_NEW_CMD:
4788 BUG();
4789 break;
c66ac9db 4790 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4791 if (!cmd->se_tfo->new_cmd_map) {
4792 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4793 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4794 BUG();
4795 }
e3d6f909 4796 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 4797 if (ret < 0) {
4798 cmd->transport_error_status = ret;
4799 transport_generic_request_failure(cmd, NULL,
4800 0, (cmd->data_direction !=
4801 DMA_TO_DEVICE));
4802 break;
4803 }
c66ac9db 4804 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 4805 if (ret == -EAGAIN)
4806 break;
4807 else if (ret < 0) {
c66ac9db
NB		 4808 cmd->transport_error_status = ret;
4809 transport_generic_request_failure(cmd, NULL,
4810 0, (cmd->data_direction !=
4811 DMA_TO_DEVICE));
4812 }
4813 break;
4814 case TRANSPORT_PROCESS_WRITE:
4815 transport_generic_process_write(cmd);
4816 break;
4817 case TRANSPORT_COMPLETE_OK:
4818 transport_stop_all_task_timers(cmd);
4819 transport_generic_complete_ok(cmd);
4820 break;
4821 case TRANSPORT_REMOVE:
e6a2573f 4822 transport_put_cmd(cmd);
c66ac9db 4823 break;
f4366772 4824 case TRANSPORT_FREE_CMD_INTR:
82f1c8a4 4825 transport_generic_free_cmd(cmd, 0);
f4366772 4826 break;
c66ac9db
NB		 4827 case TRANSPORT_PROCESS_TMR:
4828 transport_generic_do_tmr(cmd);
4829 break;
4830 case TRANSPORT_COMPLETE_FAILURE:
4831 transport_generic_request_failure(cmd, NULL, 1, 1);
4832 break;
4833 case TRANSPORT_COMPLETE_TIMEOUT:
4834 transport_stop_all_task_timers(cmd);
4835 transport_generic_request_timeout(cmd);
4836 break;
07bde79a 4837 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4838 transport_write_pending_qf(cmd);
4839 break;
4840 case TRANSPORT_COMPLETE_QF_OK:
4841 transport_complete_qf(cmd);
07bde79a 4842 break;
c66ac9db 4843 default:
6708bb27 4844 pr_err("Unknown t_state: %d deferred_t_state:"
c66ac9db 4845 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5951146d 4846 " %u\n", cmd->t_state, cmd->deferred_t_state,
e3d6f909
AG		 4847 cmd->se_tfo->get_task_tag(cmd),
4848 cmd->se_tfo->get_cmd_state(cmd),
4849 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4850 BUG();
4851 }
4852
4853 goto get_cmd;
4854 }
4855
4856out:
ce8762f6
NB		 4857 WARN_ON(!list_empty(&dev->state_task_list));
4858 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4859 dev->process_thread = NULL;
4860 return 0;
4861}