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target: reshuffle headers
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
c66ac9db
NB		 40#include <asm/unaligned.h>
41#include <net/sock.h>
42#include <net/tcp.h>
43#include <scsi/scsi.h>
44#include <scsi/scsi_cmnd.h>
e66ecd50 45#include <scsi/scsi_tcq.h>
c66ac9db
NB		 46
47#include <target/target_core_base.h>
48#include <target/target_core_device.h>
49#include <target/target_core_tmr.h>
50#include <target/target_core_tpg.h>
51#include <target/target_core_transport.h>
52#include <target/target_core_fabric_ops.h>
53#include <target/target_core_configfs.h>
54
e26d99ae 55#include "target_core_internal.h"
c66ac9db 56#include "target_core_alua.h"
c66ac9db 57#include "target_core_pr.h"
c66ac9db
NB		 58#include "target_core_ua.h"
59
e3d6f909 60static int sub_api_initialized;
c66ac9db 61
35e0e757 62static struct workqueue_struct *target_completion_wq;
c66ac9db
NB		 63static struct kmem_cache *se_sess_cache;
64struct kmem_cache *se_tmr_req_cache;
65struct kmem_cache *se_ua_cache;
c66ac9db
NB		 66struct kmem_cache *t10_pr_reg_cache;
67struct kmem_cache *t10_alua_lu_gp_cache;
68struct kmem_cache *t10_alua_lu_gp_mem_cache;
69struct kmem_cache *t10_alua_tg_pt_gp_cache;
70struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
71
c66ac9db 72static int transport_generic_write_pending(struct se_cmd *);
5951146d 73static int transport_processing_thread(void *param);
c66ac9db
NB		 74static int __transport_execute_tasks(struct se_device *dev);
75static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 76static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 77 struct se_device *dev);
c66ac9db 78static void transport_free_dev_tasks(struct se_cmd *cmd);
05d1c7c0 79static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 80static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 81static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 82static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
03e98c9e 83static void transport_generic_request_failure(struct se_cmd *);
35e0e757 84static void target_complete_ok_work(struct work_struct *work);
c66ac9db 85
e3d6f909 86int init_se_kmem_caches(void)
c66ac9db 87{
c66ac9db
NB		 88 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
89 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
90 0, NULL);
6708bb27
AG		 91 if (!se_tmr_req_cache) {
92 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db 93 " failed\n");
97c34f3b 94 goto out;
c66ac9db
NB		 95 }
96 se_sess_cache = kmem_cache_create("se_sess_cache",
97 sizeof(struct se_session), __alignof__(struct se_session),
98 0, NULL);
6708bb27
AG		 99 if (!se_sess_cache) {
100 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 101 " failed\n");
35e0e757 102 goto out_free_tmr_req_cache;
c66ac9db
NB		 103 }
104 se_ua_cache = kmem_cache_create("se_ua_cache",
105 sizeof(struct se_ua), __alignof__(struct se_ua),
106 0, NULL);
6708bb27
AG		 107 if (!se_ua_cache) {
108 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 109 goto out_free_sess_cache;
c66ac9db 110 }
c66ac9db
NB		 111 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
112 sizeof(struct t10_pr_registration),
113 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 114 if (!t10_pr_reg_cache) {
115 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 116 " failed\n");
35e0e757 117 goto out_free_ua_cache;
c66ac9db
NB		 118 }
119 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
120 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
121 0, NULL);
6708bb27
AG		 122 if (!t10_alua_lu_gp_cache) {
123 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 124 " failed\n");
35e0e757 125 goto out_free_pr_reg_cache;
c66ac9db
NB		 126 }
127 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
128 sizeof(struct t10_alua_lu_gp_member),
129 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 130 if (!t10_alua_lu_gp_mem_cache) {
131 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 132 "cache failed\n");
35e0e757 133 goto out_free_lu_gp_cache;
c66ac9db
NB		 134 }
135 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
136 sizeof(struct t10_alua_tg_pt_gp),
137 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 138 if (!t10_alua_tg_pt_gp_cache) {
139 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 140 "cache failed\n");
35e0e757 141 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 142 }
143 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
144 "t10_alua_tg_pt_gp_mem_cache",
145 sizeof(struct t10_alua_tg_pt_gp_member),
146 __alignof__(struct t10_alua_tg_pt_gp_member),
147 0, NULL);
6708bb27
AG		 148 if (!t10_alua_tg_pt_gp_mem_cache) {
149 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 150 "mem_t failed\n");
35e0e757 151 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 152 }
153
35e0e757
CH		 154 target_completion_wq = alloc_workqueue("target_completion",
155 WQ_MEM_RECLAIM, 0);
156 if (!target_completion_wq)
157 goto out_free_tg_pt_gp_mem_cache;
158
c66ac9db 159 return 0;
35e0e757
CH		 160
161out_free_tg_pt_gp_mem_cache:
162 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
163out_free_tg_pt_gp_cache:
164 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
165out_free_lu_gp_mem_cache:
166 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
167out_free_lu_gp_cache:
168 kmem_cache_destroy(t10_alua_lu_gp_cache);
169out_free_pr_reg_cache:
170 kmem_cache_destroy(t10_pr_reg_cache);
171out_free_ua_cache:
172 kmem_cache_destroy(se_ua_cache);
173out_free_sess_cache:
174 kmem_cache_destroy(se_sess_cache);
175out_free_tmr_req_cache:
176 kmem_cache_destroy(se_tmr_req_cache);
c66ac9db 177out:
e3d6f909 178 return -ENOMEM;
c66ac9db
NB		 179}
180
e3d6f909 181void release_se_kmem_caches(void)
c66ac9db 182{
35e0e757 183 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 184 kmem_cache_destroy(se_tmr_req_cache);
185 kmem_cache_destroy(se_sess_cache);
186 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 187 kmem_cache_destroy(t10_pr_reg_cache);
188 kmem_cache_destroy(t10_alua_lu_gp_cache);
189 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
190 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
191 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 192}
193
e3d6f909
AG		 194/* This code ensures unique mib indexes are handed out. */
195static DEFINE_SPINLOCK(scsi_mib_index_lock);
196static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 197
198/*
199 * Allocate a new row index for the entry type specified
200 */
201u32 scsi_get_new_index(scsi_index_t type)
202{
203 u32 new_index;
204
e3d6f909 205 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 206
e3d6f909
AG		 207 spin_lock(&scsi_mib_index_lock);
208 new_index = ++scsi_mib_index[type];
209 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 210
211 return new_index;
212}
213
e26d99ae 214static void transport_init_queue_obj(struct se_queue_obj *qobj)
c66ac9db
NB		 215{
216 atomic_set(&qobj->queue_cnt, 0);
217 INIT_LIST_HEAD(&qobj->qobj_list);
218 init_waitqueue_head(&qobj->thread_wq);
219 spin_lock_init(&qobj->cmd_queue_lock);
220}
c66ac9db 221
dbc5623e 222void transport_subsystem_check_init(void)
c66ac9db
NB		 223{
224 int ret;
225
dbc5623e
NB		 226 if (sub_api_initialized)
227 return;
228
c66ac9db
NB		 229 ret = request_module("target_core_iblock");
230 if (ret != 0)
6708bb27 231 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 232
233 ret = request_module("target_core_file");
234 if (ret != 0)
6708bb27 235 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 236
237 ret = request_module("target_core_pscsi");
238 if (ret != 0)
6708bb27 239 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 240
241 ret = request_module("target_core_stgt");
242 if (ret != 0)
6708bb27 243 pr_err("Unable to load target_core_stgt\n");
c66ac9db 244
e3d6f909 245 sub_api_initialized = 1;
dbc5623e 246 return;
c66ac9db
NB		 247}
248
249struct se_session *transport_init_session(void)
250{
251 struct se_session *se_sess;
252
253 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 254 if (!se_sess) {
255 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 256 " se_sess_cache\n");
257 return ERR_PTR(-ENOMEM);
258 }
259 INIT_LIST_HEAD(&se_sess->sess_list);
260 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d
NB		 261 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
262 INIT_LIST_HEAD(&se_sess->sess_wait_list);
263 spin_lock_init(&se_sess->sess_cmd_lock);
c66ac9db
NB		 264
265 return se_sess;
266}
267EXPORT_SYMBOL(transport_init_session);
268
269/*
270 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
271 */
272void __transport_register_session(
273 struct se_portal_group *se_tpg,
274 struct se_node_acl *se_nacl,
275 struct se_session *se_sess,
276 void *fabric_sess_ptr)
277{
278 unsigned char buf[PR_REG_ISID_LEN];
279
280 se_sess->se_tpg = se_tpg;
281 se_sess->fabric_sess_ptr = fabric_sess_ptr;
282 /*
283 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
284 *
285 * Only set for struct se_session's that will actually be moving I/O.
286 * eg: *NOT* discovery sessions.
287 */
288 if (se_nacl) {
289 /*
290 * If the fabric module supports an ISID based TransportID,
291 * save this value in binary from the fabric I_T Nexus now.
292 */
e3d6f909 293 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 294 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 295 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 296 &buf[0], PR_REG_ISID_LEN);
297 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
298 }
299 spin_lock_irq(&se_nacl->nacl_sess_lock);
300 /*
301 * The se_nacl->nacl_sess pointer will be set to the
302 * last active I_T Nexus for each struct se_node_acl.
303 */
304 se_nacl->nacl_sess = se_sess;
305
306 list_add_tail(&se_sess->sess_acl_list,
307 &se_nacl->acl_sess_list);
308 spin_unlock_irq(&se_nacl->nacl_sess_lock);
309 }
310 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
311
6708bb27 312 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 313 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 314}
315EXPORT_SYMBOL(__transport_register_session);
316
317void transport_register_session(
318 struct se_portal_group *se_tpg,
319 struct se_node_acl *se_nacl,
320 struct se_session *se_sess,
321 void *fabric_sess_ptr)
322{
323 spin_lock_bh(&se_tpg->session_lock);
324 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
325 spin_unlock_bh(&se_tpg->session_lock);
326}
327EXPORT_SYMBOL(transport_register_session);
328
329void transport_deregister_session_configfs(struct se_session *se_sess)
330{
331 struct se_node_acl *se_nacl;
23388864 332 unsigned long flags;
c66ac9db
NB		 333 /*
334 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
335 */
336 se_nacl = se_sess->se_node_acl;
6708bb27 337 if (se_nacl) {
23388864 338 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 339 list_del(&se_sess->sess_acl_list);
340 /*
341 * If the session list is empty, then clear the pointer.
342 * Otherwise, set the struct se_session pointer from the tail
343 * element of the per struct se_node_acl active session list.
344 */
345 if (list_empty(&se_nacl->acl_sess_list))
346 se_nacl->nacl_sess = NULL;
347 else {
348 se_nacl->nacl_sess = container_of(
349 se_nacl->acl_sess_list.prev,
350 struct se_session, sess_acl_list);
351 }
23388864 352 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 353 }
354}
355EXPORT_SYMBOL(transport_deregister_session_configfs);
356
357void transport_free_session(struct se_session *se_sess)
358{
359 kmem_cache_free(se_sess_cache, se_sess);
360}
361EXPORT_SYMBOL(transport_free_session);
362
363void transport_deregister_session(struct se_session *se_sess)
364{
365 struct se_portal_group *se_tpg = se_sess->se_tpg;
366 struct se_node_acl *se_nacl;
e63a8e19 367 unsigned long flags;
c66ac9db 368
6708bb27 369 if (!se_tpg) {
c66ac9db
NB		 370 transport_free_session(se_sess);
371 return;
372 }
c66ac9db 373
e63a8e19 374 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 375 list_del(&se_sess->sess_list);
376 se_sess->se_tpg = NULL;
377 se_sess->fabric_sess_ptr = NULL;
e63a8e19 378 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 379
380 /*
381 * Determine if we need to do extra work for this initiator node's
382 * struct se_node_acl if it had been previously dynamically generated.
383 */
384 se_nacl = se_sess->se_node_acl;
6708bb27 385 if (se_nacl) {
e63a8e19 386 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 387 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 388 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
389 se_tpg)) {
c66ac9db
NB		 390 list_del(&se_nacl->acl_list);
391 se_tpg->num_node_acls--;
e63a8e19 392 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 393
394 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 395 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 396 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 397 se_nacl);
e63a8e19 398 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 399 }
400 }
e63a8e19 401 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 402 }
403
404 transport_free_session(se_sess);
405
6708bb27 406 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 407 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 408}
409EXPORT_SYMBOL(transport_deregister_session);
410
411/*
a1d8b49a 412 * Called with cmd->t_state_lock held.
c66ac9db
NB		 413 */
414static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
415{
42bf829e 416 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 417 struct se_task *task;
418 unsigned long flags;
419
42bf829e
CH		 420 if (!dev)
421 return;
c66ac9db 422
42bf829e 423 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 424 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 425 continue;
426
6708bb27 427 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 428 continue;
429
430 spin_lock_irqsave(&dev->execute_task_lock, flags);
431 list_del(&task->t_state_list);
6708bb27
AG		 432 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
433 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 434 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
435
436 atomic_set(&task->task_state_active, 0);
a1d8b49a 437 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 438 }
439}
440
441/* transport_cmd_check_stop():
442 *
443 * 'transport_off = 1' determines if t_transport_active should be cleared.
444 * 'transport_off = 2' determines if task_dev_state should be removed.
445 *
446 * A non-zero u8 t_state sets cmd->t_state.
447 * Returns 1 when command is stopped, else 0.
448 */
449static int transport_cmd_check_stop(
450 struct se_cmd *cmd,
451 int transport_off,
452 u8 t_state)
453{
454 unsigned long flags;
455
a1d8b49a 456 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 457 /*
458 * Determine if IOCTL context caller in requesting the stopping of this
459 * command for LUN shutdown purposes.
460 */
a1d8b49a 461 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 462 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 463 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 464 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 465
a1d8b49a 466 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 467 if (transport_off == 2)
468 transport_all_task_dev_remove_state(cmd);
a1d8b49a 469 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 470
a1d8b49a 471 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 472 return 1;
473 }
474 /*
475 * Determine if frontend context caller is requesting the stopping of
e3d6f909 476 * this command for frontend exceptions.
c66ac9db 477 */
a1d8b49a 478 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 479 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 480 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 481 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 482
c66ac9db
NB		 483 if (transport_off == 2)
484 transport_all_task_dev_remove_state(cmd);
485
486 /*
487 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
488 * to FE.
489 */
490 if (transport_off == 2)
491 cmd->se_lun = NULL;
a1d8b49a 492 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 493
a1d8b49a 494 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 495 return 1;
496 }
497 if (transport_off) {
a1d8b49a 498 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 499 if (transport_off == 2) {
500 transport_all_task_dev_remove_state(cmd);
501 /*
502 * Clear struct se_cmd->se_lun before the transport_off == 2
503 * handoff to fabric module.
504 */
505 cmd->se_lun = NULL;
506 /*
507 * Some fabric modules like tcm_loop can release
25985edc 508 * their internally allocated I/O reference now and
c66ac9db 509 * struct se_cmd now.
88dd9e26
NB		 510 *
511 * Fabric modules are expected to return '1' here if the
512 * se_cmd being passed is released at this point,
513 * or zero if not being released.
c66ac9db 514 */
e3d6f909 515 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 516 spin_unlock_irqrestore(
a1d8b49a 517 &cmd->t_state_lock, flags);
c66ac9db 518
88dd9e26 519 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 520 }
521 }
a1d8b49a 522 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 523
524 return 0;
525 } else if (t_state)
526 cmd->t_state = t_state;
a1d8b49a 527 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 528
529 return 0;
530}
531
532static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
533{
534 return transport_cmd_check_stop(cmd, 2, 0);
535}
536
537static void transport_lun_remove_cmd(struct se_cmd *cmd)
538{
e3d6f909 539 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 540 unsigned long flags;
541
542 if (!lun)
543 return;
544
a1d8b49a 545 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 546 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 547 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 548 goto check_lun;
549 }
a1d8b49a 550 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 551 transport_all_task_dev_remove_state(cmd);
a1d8b49a 552 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 553
c66ac9db
NB		 554
555check_lun:
556 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 557 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 558 list_del(&cmd->se_lun_node);
a1d8b49a 559 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 560#if 0
6708bb27 561 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 562 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 563#endif
564 }
565 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
566}
567
568void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
569{
8dc52b54
NB		 570 if (!cmd->se_tmr_req)
571 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 572
573 if (transport_cmd_check_stop_to_fabric(cmd))
574 return;
77039d1e 575 if (remove) {
3df8d40b 576 transport_remove_cmd_from_queue(cmd);
e6a2573f 577 transport_put_cmd(cmd);
77039d1e 578 }
c66ac9db
NB		 579}
580
f7a5cc0b
CH		 581static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
582 bool at_head)
c66ac9db
NB		 583{
584 struct se_device *dev = cmd->se_dev;
e3d6f909 585 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 586 unsigned long flags;
587
c66ac9db 588 if (t_state) {
a1d8b49a 589 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 590 cmd->t_state = t_state;
a1d8b49a
AG		 591 atomic_set(&cmd->t_transport_active, 1);
592 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 593 }
594
595 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 596
597 /* If the cmd is already on the list, remove it before we add it */
598 if (!list_empty(&cmd->se_queue_node))
599 list_del(&cmd->se_queue_node);
600 else
601 atomic_inc(&qobj->queue_cnt);
602
f7a5cc0b 603 if (at_head)
07bde79a 604 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 605 else
07bde79a 606 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 607 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 608 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
609
c66ac9db 610 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 611}
612
5951146d
AG		 613static struct se_cmd *
614transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 615{
5951146d 616 struct se_cmd *cmd;
c66ac9db
NB		 617 unsigned long flags;
618
619 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
620 if (list_empty(&qobj->qobj_list)) {
621 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
622 return NULL;
623 }
5951146d 624 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 625
79a7fef2 626 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 627
79a7fef2 628 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 629 atomic_dec(&qobj->queue_cnt);
630 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
631
5951146d 632 return cmd;
c66ac9db
NB		 633}
634
3df8d40b 635static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 636{
3df8d40b 637 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 638 unsigned long flags;
639
640 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 641 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 642 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
643 return;
644 }
79a7fef2
RD		 645 atomic_set(&cmd->t_transport_queue_active, 0);
646 atomic_dec(&qobj->queue_cnt);
647 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 648 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
649
a1d8b49a 650 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 651 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 652 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 653 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 654 }
655}
656
657/*
658 * Completion function used by TCM subsystem plugins (such as FILEIO)
659 * for queueing up response from struct se_subsystem_api->do_task()
660 */
661void transport_complete_sync_cache(struct se_cmd *cmd, int good)
662{
a1d8b49a 663 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 664 struct se_task, t_list);
665
666 if (good) {
667 cmd->scsi_status = SAM_STAT_GOOD;
668 task->task_scsi_status = GOOD;
669 } else {
670 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
03e98c9e
NB		 671 task->task_se_cmd->scsi_sense_reason =
672 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
673
c66ac9db
NB		 674 }
675
676 transport_complete_task(task, good);
677}
678EXPORT_SYMBOL(transport_complete_sync_cache);
679
35e0e757
CH		 680static void target_complete_failure_work(struct work_struct *work)
681{
682 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
683
03e98c9e 684 transport_generic_request_failure(cmd);
35e0e757
CH		 685}
686
c66ac9db
NB		 687/* transport_complete_task():
688 *
689 * Called from interrupt and non interrupt context depending
690 * on the transport plugin.
691 */
692void transport_complete_task(struct se_task *task, int success)
693{
e3d6f909 694 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 695 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 696 unsigned long flags;
697#if 0
6708bb27 698 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 699 cmd->t_task_cdb[0], dev);
c66ac9db 700#endif
e3d6f909 701 if (dev)
c66ac9db 702 atomic_inc(&dev->depth_left);
c66ac9db 703
a1d8b49a 704 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 705 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 706
707 /*
708 * See if any sense data exists, if so set the TASK_SENSE flag.
709 * Also check for any other post completion work that needs to be
710 * done by the plugins.
711 */
712 if (dev && dev->transport->transport_complete) {
713 if (dev->transport->transport_complete(task) != 0) {
714 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
715 task->task_sense = 1;
716 success = 1;
717 }
718 }
719
720 /*
721 * See if we are waiting for outstanding struct se_task
722 * to complete for an exception condition
723 */
6c76bf95 724 if (task->task_flags & TF_REQUEST_STOP) {
a1d8b49a 725 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 726 complete(&task->task_stop_comp);
727 return;
728 }
2235007c
CH		 729
730 if (!success)
731 cmd->t_tasks_failed = 1;
732
c66ac9db
NB		 733 /*
734 * Decrement the outstanding t_task_cdbs_left count. The last
735 * struct se_task from struct se_cmd will complete itself into the
736 * device queue depending upon int success.
737 */
6708bb27 738 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
a1d8b49a 739 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 740 return;
741 }
742
2235007c 743 if (cmd->t_tasks_failed) {
c66ac9db
NB		 744 if (!task->task_error_status) {
745 task->task_error_status =
03e98c9e
NB		 746 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
747 cmd->scsi_sense_reason =
748 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 749 }
03e98c9e 750
35e0e757 751 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 752 } else {
a1d8b49a 753 atomic_set(&cmd->t_transport_complete, 1);
35e0e757 754 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 755 }
35e0e757 756
35e0e757
CH		 757 cmd->t_state = TRANSPORT_COMPLETE;
758 atomic_set(&cmd->t_transport_active, 1);
a1d8b49a 759 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 760
35e0e757 761 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 762}
763EXPORT_SYMBOL(transport_complete_task);
764
765/*
766 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
767 * struct se_task list are ready to be added to the active execution list
768 * struct se_device
769
770 * Called with se_dev_t->execute_task_lock called.
771 */
772static inline int transport_add_task_check_sam_attr(
773 struct se_task *task,
774 struct se_task *task_prev,
775 struct se_device *dev)
776{
777 /*
778 * No SAM Task attribute emulation enabled, add to tail of
779 * execution queue
780 */
781 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
782 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
783 return 0;
784 }
785 /*
786 * HEAD_OF_QUEUE attribute for received CDB, which means
787 * the first task that is associated with a struct se_cmd goes to
788 * head of the struct se_device->execute_task_list, and task_prev
789 * after that for each subsequent task
790 */
e66ecd50 791 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 792 list_add(&task->t_execute_list,
793 (task_prev != NULL) ?
794 &task_prev->t_execute_list :
795 &dev->execute_task_list);
796
6708bb27 797 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 798 " in execution queue\n",
6708bb27 799 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 800 return 1;
801 }
802 /*
803 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
804 * transitioned from Dermant -> Active state, and are added to the end
805 * of the struct se_device->execute_task_list
806 */
807 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
808 return 0;
809}
810
811/* __transport_add_task_to_execute_queue():
812 *
813 * Called with se_dev_t->execute_task_lock called.
814 */
815static void __transport_add_task_to_execute_queue(
816 struct se_task *task,
817 struct se_task *task_prev,
818 struct se_device *dev)
819{
820 int head_of_queue;
821
822 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
823 atomic_inc(&dev->execute_tasks);
824
825 if (atomic_read(&task->task_state_active))
826 return;
827 /*
828 * Determine if this task needs to go to HEAD_OF_QUEUE for the
829 * state list as well. Running with SAM Task Attribute emulation
830 * will always return head_of_queue == 0 here
831 */
832 if (head_of_queue)
833 list_add(&task->t_state_list, (task_prev) ?
834 &task_prev->t_state_list :
835 &dev->state_task_list);
836 else
837 list_add_tail(&task->t_state_list, &dev->state_task_list);
838
839 atomic_set(&task->task_state_active, 1);
840
6708bb27 841 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 842 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 843 task, dev);
844}
845
846static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
847{
42bf829e 848 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 849 struct se_task *task;
850 unsigned long flags;
851
a1d8b49a
AG		 852 spin_lock_irqsave(&cmd->t_state_lock, flags);
853 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 854 if (atomic_read(&task->task_state_active))
855 continue;
856
857 spin_lock(&dev->execute_task_lock);
858 list_add_tail(&task->t_state_list, &dev->state_task_list);
859 atomic_set(&task->task_state_active, 1);
860
6708bb27
AG		 861 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
862 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 863 task->task_se_cmd), task, dev);
864
865 spin_unlock(&dev->execute_task_lock);
866 }
a1d8b49a 867 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 868}
869
870static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
871{
5951146d 872 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 873 struct se_task *task, *task_prev = NULL;
874 unsigned long flags;
875
876 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 877 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 878 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 879 continue;
880 /*
881 * __transport_add_task_to_execute_queue() handles the
882 * SAM Task Attribute emulation if enabled
883 */
884 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 885 task_prev = task;
886 }
887 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 888}
889
04629b7b
CH		 890void __transport_remove_task_from_execute_queue(struct se_task *task,
891 struct se_device *dev)
892{
893 list_del_init(&task->t_execute_list);
894 atomic_dec(&dev->execute_tasks);
895}
896
e26d99ae 897static void transport_remove_task_from_execute_queue(
c66ac9db
NB		 898 struct se_task *task,
899 struct se_device *dev)
900{
901 unsigned long flags;
902
04629b7b 903 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 904 return;
af57c3ac 905
c66ac9db 906 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 907 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 908 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
909}
910
07bde79a 911/*
f147abb4 912 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 913 */
914
915static void target_qf_do_work(struct work_struct *work)
916{
917 struct se_device *dev = container_of(work, struct se_device,
918 qf_work_queue);
bcac364a 919 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 920 struct se_cmd *cmd, *cmd_tmp;
921
922 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 923 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
924 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 925
bcac364a 926 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 927 list_del(&cmd->se_qf_node);
928 atomic_dec(&dev->dev_qf_count);
929 smp_mb__after_atomic_dec();
07bde79a 930
6708bb27 931 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 932 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 933 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 934 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
935 : "UNKNOWN");
f7a5cc0b
CH		 936
937 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 938 }
07bde79a
NB		 939}
940
c66ac9db
NB		 941unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
942{
943 switch (cmd->data_direction) {
944 case DMA_NONE:
945 return "NONE";
946 case DMA_FROM_DEVICE:
947 return "READ";
948 case DMA_TO_DEVICE:
949 return "WRITE";
950 case DMA_BIDIRECTIONAL:
951 return "BIDI";
952 default:
953 break;
954 }
955
956 return "UNKNOWN";
957}
958
959void transport_dump_dev_state(
960 struct se_device *dev,
961 char *b,
962 int *bl)
963{
964 *bl += sprintf(b + *bl, "Status: ");
965 switch (dev->dev_status) {
966 case TRANSPORT_DEVICE_ACTIVATED:
967 *bl += sprintf(b + *bl, "ACTIVATED");
968 break;
969 case TRANSPORT_DEVICE_DEACTIVATED:
970 *bl += sprintf(b + *bl, "DEACTIVATED");
971 break;
972 case TRANSPORT_DEVICE_SHUTDOWN:
973 *bl += sprintf(b + *bl, "SHUTDOWN");
974 break;
975 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
976 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
977 *bl += sprintf(b + *bl, "OFFLINE");
978 break;
979 default:
980 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
981 break;
982 }
983
984 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
985 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
986 dev->queue_depth);
987 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 988 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 989 *bl += sprintf(b + *bl, " ");
990}
991
c66ac9db
NB		 992void transport_dump_vpd_proto_id(
993 struct t10_vpd *vpd,
994 unsigned char *p_buf,
995 int p_buf_len)
996{
997 unsigned char buf[VPD_TMP_BUF_SIZE];
998 int len;
999
1000 memset(buf, 0, VPD_TMP_BUF_SIZE);
1001 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1002
1003 switch (vpd->protocol_identifier) {
1004 case 0x00:
1005 sprintf(buf+len, "Fibre Channel\n");
1006 break;
1007 case 0x10:
1008 sprintf(buf+len, "Parallel SCSI\n");
1009 break;
1010 case 0x20:
1011 sprintf(buf+len, "SSA\n");
1012 break;
1013 case 0x30:
1014 sprintf(buf+len, "IEEE 1394\n");
1015 break;
1016 case 0x40:
1017 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1018 " Protocol\n");
1019 break;
1020 case 0x50:
1021 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1022 break;
1023 case 0x60:
1024 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1025 break;
1026 case 0x70:
1027 sprintf(buf+len, "Automation/Drive Interface Transport"
1028 " Protocol\n");
1029 break;
1030 case 0x80:
1031 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1032 break;
1033 default:
1034 sprintf(buf+len, "Unknown 0x%02x\n",
1035 vpd->protocol_identifier);
1036 break;
1037 }
1038
1039 if (p_buf)
1040 strncpy(p_buf, buf, p_buf_len);
1041 else
6708bb27 1042 pr_debug("%s", buf);
c66ac9db
NB		 1043}
1044
1045void
1046transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1047{
1048 /*
1049 * Check if the Protocol Identifier Valid (PIV) bit is set..
1050 *
1051 * from spc3r23.pdf section 7.5.1
1052 */
1053 if (page_83[1] & 0x80) {
1054 vpd->protocol_identifier = (page_83[0] & 0xf0);
1055 vpd->protocol_identifier_set = 1;
1056 transport_dump_vpd_proto_id(vpd, NULL, 0);
1057 }
1058}
1059EXPORT_SYMBOL(transport_set_vpd_proto_id);
1060
1061int transport_dump_vpd_assoc(
1062 struct t10_vpd *vpd,
1063 unsigned char *p_buf,
1064 int p_buf_len)
1065{
1066 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1067 int ret = 0;
1068 int len;
c66ac9db
NB		 1069
1070 memset(buf, 0, VPD_TMP_BUF_SIZE);
1071 len = sprintf(buf, "T10 VPD Identifier Association: ");
1072
1073 switch (vpd->association) {
1074 case 0x00:
1075 sprintf(buf+len, "addressed logical unit\n");
1076 break;
1077 case 0x10:
1078 sprintf(buf+len, "target port\n");
1079 break;
1080 case 0x20:
1081 sprintf(buf+len, "SCSI target device\n");
1082 break;
1083 default:
1084 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1085 ret = -EINVAL;
c66ac9db
NB		 1086 break;
1087 }
1088
1089 if (p_buf)
1090 strncpy(p_buf, buf, p_buf_len);
1091 else
6708bb27 1092 pr_debug("%s", buf);
c66ac9db
NB		 1093
1094 return ret;
1095}
1096
1097int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1098{
1099 /*
1100 * The VPD identification association..
1101 *
1102 * from spc3r23.pdf Section 7.6.3.1 Table 297
1103 */
1104 vpd->association = (page_83[1] & 0x30);
1105 return transport_dump_vpd_assoc(vpd, NULL, 0);
1106}
1107EXPORT_SYMBOL(transport_set_vpd_assoc);
1108
1109int transport_dump_vpd_ident_type(
1110 struct t10_vpd *vpd,
1111 unsigned char *p_buf,
1112 int p_buf_len)
1113{
1114 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1115 int ret = 0;
1116 int len;
c66ac9db
NB		 1117
1118 memset(buf, 0, VPD_TMP_BUF_SIZE);
1119 len = sprintf(buf, "T10 VPD Identifier Type: ");
1120
1121 switch (vpd->device_identifier_type) {
1122 case 0x00:
1123 sprintf(buf+len, "Vendor specific\n");
1124 break;
1125 case 0x01:
1126 sprintf(buf+len, "T10 Vendor ID based\n");
1127 break;
1128 case 0x02:
1129 sprintf(buf+len, "EUI-64 based\n");
1130 break;
1131 case 0x03:
1132 sprintf(buf+len, "NAA\n");
1133 break;
1134 case 0x04:
1135 sprintf(buf+len, "Relative target port identifier\n");
1136 break;
1137 case 0x08:
1138 sprintf(buf+len, "SCSI name string\n");
1139 break;
1140 default:
1141 sprintf(buf+len, "Unsupported: 0x%02x\n",
1142 vpd->device_identifier_type);
e3d6f909 1143 ret = -EINVAL;
c66ac9db
NB		 1144 break;
1145 }
1146
e3d6f909
AG		 1147 if (p_buf) {
1148 if (p_buf_len < strlen(buf)+1)
1149 return -EINVAL;
c66ac9db 1150 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1151 } else {
6708bb27 1152 pr_debug("%s", buf);
e3d6f909 1153 }
c66ac9db
NB		 1154
1155 return ret;
1156}
1157
1158int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1159{
1160 /*
1161 * The VPD identifier type..
1162 *
1163 * from spc3r23.pdf Section 7.6.3.1 Table 298
1164 */
1165 vpd->device_identifier_type = (page_83[1] & 0x0f);
1166 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1167}
1168EXPORT_SYMBOL(transport_set_vpd_ident_type);
1169
1170int transport_dump_vpd_ident(
1171 struct t10_vpd *vpd,
1172 unsigned char *p_buf,
1173 int p_buf_len)
1174{
1175 unsigned char buf[VPD_TMP_BUF_SIZE];
1176 int ret = 0;
1177
1178 memset(buf, 0, VPD_TMP_BUF_SIZE);
1179
1180 switch (vpd->device_identifier_code_set) {
1181 case 0x01: /* Binary */
1182 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1183 &vpd->device_identifier[0]);
1184 break;
1185 case 0x02: /* ASCII */
1186 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1187 &vpd->device_identifier[0]);
1188 break;
1189 case 0x03: /* UTF-8 */
1190 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1191 &vpd->device_identifier[0]);
1192 break;
1193 default:
1194 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1195 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1196 ret = -EINVAL;
c66ac9db
NB		 1197 break;
1198 }
1199
1200 if (p_buf)
1201 strncpy(p_buf, buf, p_buf_len);
1202 else
6708bb27 1203 pr_debug("%s", buf);
c66ac9db
NB		 1204
1205 return ret;
1206}
1207
1208int
1209transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1210{
1211 static const char hex_str[] = "0123456789abcdef";
1212 int j = 0, i = 4; /* offset to start of the identifer */
1213
1214 /*
1215 * The VPD Code Set (encoding)
1216 *
1217 * from spc3r23.pdf Section 7.6.3.1 Table 296
1218 */
1219 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1220 switch (vpd->device_identifier_code_set) {
1221 case 0x01: /* Binary */
1222 vpd->device_identifier[j++] =
1223 hex_str[vpd->device_identifier_type];
1224 while (i < (4 + page_83[3])) {
1225 vpd->device_identifier[j++] =
1226 hex_str[(page_83[i] & 0xf0) >> 4];
1227 vpd->device_identifier[j++] =
1228 hex_str[page_83[i] & 0x0f];
1229 i++;
1230 }
1231 break;
1232 case 0x02: /* ASCII */
1233 case 0x03: /* UTF-8 */
1234 while (i < (4 + page_83[3]))
1235 vpd->device_identifier[j++] = page_83[i++];
1236 break;
1237 default:
1238 break;
1239 }
1240
1241 return transport_dump_vpd_ident(vpd, NULL, 0);
1242}
1243EXPORT_SYMBOL(transport_set_vpd_ident);
1244
1245static void core_setup_task_attr_emulation(struct se_device *dev)
1246{
1247 /*
1248 * If this device is from Target_Core_Mod/pSCSI, disable the
1249 * SAM Task Attribute emulation.
1250 *
1251 * This is currently not available in upsream Linux/SCSI Target
1252 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1253 */
e3d6f909 1254 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1255 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1256 return;
1257 }
1258
1259 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1260 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1261 " device\n", dev->transport->name,
1262 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1263}
1264
1265static void scsi_dump_inquiry(struct se_device *dev)
1266{
e3d6f909 1267 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1268 int i, device_type;
1269 /*
1270 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1271 */
6708bb27 1272 pr_debug(" Vendor: ");
c66ac9db
NB		 1273 for (i = 0; i < 8; i++)
1274 if (wwn->vendor[i] >= 0x20)
6708bb27 1275 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1276 else
6708bb27 1277 pr_debug(" ");
c66ac9db 1278
6708bb27 1279 pr_debug(" Model: ");
c66ac9db
NB		 1280 for (i = 0; i < 16; i++)
1281 if (wwn->model[i] >= 0x20)
6708bb27 1282 pr_debug("%c", wwn->model[i]);
c66ac9db 1283 else
6708bb27 1284 pr_debug(" ");
c66ac9db 1285
6708bb27 1286 pr_debug(" Revision: ");
c66ac9db
NB		 1287 for (i = 0; i < 4; i++)
1288 if (wwn->revision[i] >= 0x20)
6708bb27 1289 pr_debug("%c", wwn->revision[i]);
c66ac9db 1290 else
6708bb27 1291 pr_debug(" ");
c66ac9db 1292
6708bb27 1293 pr_debug("\n");
c66ac9db 1294
e3d6f909 1295 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1296 pr_debug(" Type: %s ", scsi_device_type(device_type));
1297 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1298 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1299}
1300
1301struct se_device *transport_add_device_to_core_hba(
1302 struct se_hba *hba,
1303 struct se_subsystem_api *transport,
1304 struct se_subsystem_dev *se_dev,
1305 u32 device_flags,
1306 void *transport_dev,
1307 struct se_dev_limits *dev_limits,
1308 const char *inquiry_prod,
1309 const char *inquiry_rev)
1310{
12a18bdc 1311 int force_pt;
c66ac9db
NB		 1312 struct se_device *dev;
1313
1314 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1315 if (!dev) {
1316 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1317 return NULL;
1318 }
c66ac9db 1319
e3d6f909 1320 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1321 dev->dev_flags = device_flags;
1322 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1323 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1324 dev->se_hba = hba;
1325 dev->se_sub_dev = se_dev;
1326 dev->transport = transport;
c66ac9db
NB		 1327 INIT_LIST_HEAD(&dev->dev_list);
1328 INIT_LIST_HEAD(&dev->dev_sep_list);
1329 INIT_LIST_HEAD(&dev->dev_tmr_list);
1330 INIT_LIST_HEAD(&dev->execute_task_list);
1331 INIT_LIST_HEAD(&dev->delayed_cmd_list);
c66ac9db 1332 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1333 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1334 spin_lock_init(&dev->execute_task_lock);
1335 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1336 spin_lock_init(&dev->dev_reservation_lock);
1337 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1338 spin_lock_init(&dev->se_port_lock);
1339 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1340 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1341
1342 dev->queue_depth = dev_limits->queue_depth;
1343 atomic_set(&dev->depth_left, dev->queue_depth);
1344 atomic_set(&dev->dev_ordered_id, 0);
1345
1346 se_dev_set_default_attribs(dev, dev_limits);
1347
1348 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1349 dev->creation_time = get_jiffies_64();
1350 spin_lock_init(&dev->stats_lock);
1351
1352 spin_lock(&hba->device_lock);
1353 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1354 hba->dev_count++;
1355 spin_unlock(&hba->device_lock);
1356 /*
1357 * Setup the SAM Task Attribute emulation for struct se_device
1358 */
1359 core_setup_task_attr_emulation(dev);
1360 /*
1361 * Force PR and ALUA passthrough emulation with internal object use.
1362 */
1363 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1364 /*
1365 * Setup the Reservations infrastructure for struct se_device
1366 */
1367 core_setup_reservations(dev, force_pt);
1368 /*
1369 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1370 */
1371 if (core_setup_alua(dev, force_pt) < 0)
1372 goto out;
1373
1374 /*
1375 * Startup the struct se_device processing thread
1376 */
1377 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1378 "LIO_%s", dev->transport->name);
c66ac9db 1379 if (IS_ERR(dev->process_thread)) {
6708bb27 1380 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1381 dev->transport->name);
c66ac9db
NB		 1382 goto out;
1383 }
07bde79a
NB		 1384 /*
1385 * Setup work_queue for QUEUE_FULL
1386 */
1387 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1388 /*
1389 * Preload the initial INQUIRY const values if we are doing
1390 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1391 * passthrough because this is being provided by the backend LLD.
1392 * This is required so that transport_get_inquiry() copies these
1393 * originals once back into DEV_T10_WWN(dev) for the virtual device
1394 * setup.
1395 */
e3d6f909 1396 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1397 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1398 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1399 " INQUIRY consts\n");
1400 goto out;
1401 }
1402
e3d6f909
AG		 1403 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1404 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1405 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1406 }
1407 scsi_dump_inquiry(dev);
1408
12a18bdc 1409 return dev;
c66ac9db 1410out:
c66ac9db
NB		 1411 kthread_stop(dev->process_thread);
1412
1413 spin_lock(&hba->device_lock);
1414 list_del(&dev->dev_list);
1415 hba->dev_count--;
1416 spin_unlock(&hba->device_lock);
1417
1418 se_release_vpd_for_dev(dev);
1419
c66ac9db
NB		 1420 kfree(dev);
1421
1422 return NULL;
1423}
1424EXPORT_SYMBOL(transport_add_device_to_core_hba);
1425
1426/* transport_generic_prepare_cdb():
1427 *
1428 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1429 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1430 * The point of this is since we are mapping iSCSI LUNs to
1431 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1432 * devices and HBAs for a loop.
1433 */
1434static inline void transport_generic_prepare_cdb(
1435 unsigned char *cdb)
1436{
1437 switch (cdb[0]) {
1438 case READ_10: /* SBC - RDProtect */
1439 case READ_12: /* SBC - RDProtect */
1440 case READ_16: /* SBC - RDProtect */
1441 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1442 case VERIFY: /* SBC - VRProtect */
1443 case VERIFY_16: /* SBC - VRProtect */
1444 case WRITE_VERIFY: /* SBC - VRProtect */
1445 case WRITE_VERIFY_12: /* SBC - VRProtect */
1446 break;
1447 default:
1448 cdb[1] &= 0x1f; /* clear logical unit number */
1449 break;
1450 }
1451}
1452
1453static struct se_task *
1454transport_generic_get_task(struct se_cmd *cmd,
1455 enum dma_data_direction data_direction)
1456{
1457 struct se_task *task;
5951146d 1458 struct se_device *dev = cmd->se_dev;
c66ac9db 1459
6708bb27 1460 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1461 if (!task) {
6708bb27 1462 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1463 return NULL;
1464 }
1465
1466 INIT_LIST_HEAD(&task->t_list);
1467 INIT_LIST_HEAD(&task->t_execute_list);
1468 INIT_LIST_HEAD(&task->t_state_list);
1469 init_completion(&task->task_stop_comp);
c66ac9db 1470 task->task_se_cmd = cmd;
c66ac9db
NB		 1471 task->task_data_direction = data_direction;
1472
c66ac9db
NB		 1473 return task;
1474}
1475
1476static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1477
c66ac9db
NB		 1478/*
1479 * Used by fabric modules containing a local struct se_cmd within their
1480 * fabric dependent per I/O descriptor.
1481 */
1482void transport_init_se_cmd(
1483 struct se_cmd *cmd,
1484 struct target_core_fabric_ops *tfo,
1485 struct se_session *se_sess,
1486 u32 data_length,
1487 int data_direction,
1488 int task_attr,
1489 unsigned char *sense_buffer)
1490{
5951146d
AG		 1491 INIT_LIST_HEAD(&cmd->se_lun_node);
1492 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1493 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1494 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1495 INIT_LIST_HEAD(&cmd->se_cmd_list);
a1d8b49a
AG		 1496 INIT_LIST_HEAD(&cmd->t_task_list);
1497 init_completion(&cmd->transport_lun_fe_stop_comp);
1498 init_completion(&cmd->transport_lun_stop_comp);
1499 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1500 init_completion(&cmd->cmd_wait_comp);
a1d8b49a
AG		 1501 spin_lock_init(&cmd->t_state_lock);
1502 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1503
1504 cmd->se_tfo = tfo;
1505 cmd->se_sess = se_sess;
1506 cmd->data_length = data_length;
1507 cmd->data_direction = data_direction;
1508 cmd->sam_task_attr = task_attr;
1509 cmd->sense_buffer = sense_buffer;
1510}
1511EXPORT_SYMBOL(transport_init_se_cmd);
1512
1513static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1514{
1515 /*
1516 * Check if SAM Task Attribute emulation is enabled for this
1517 * struct se_device storage object
1518 */
5951146d 1519 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1520 return 0;
1521
e66ecd50 1522 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1523 pr_debug("SAM Task Attribute ACA"
c66ac9db 1524 " emulation is not supported\n");
e3d6f909 1525 return -EINVAL;
c66ac9db
NB		 1526 }
1527 /*
1528 * Used to determine when ORDERED commands should go from
1529 * Dormant to Active status.
1530 */
5951146d 1531 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1532 smp_mb__after_atomic_inc();
6708bb27 1533 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1534 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1535 cmd->se_dev->transport->name);
c66ac9db
NB		 1536 return 0;
1537}
1538
c66ac9db
NB		 1539/* transport_generic_allocate_tasks():
1540 *
1541 * Called from fabric RX Thread.
1542 */
1543int transport_generic_allocate_tasks(
1544 struct se_cmd *cmd,
1545 unsigned char *cdb)
1546{
1547 int ret;
1548
1549 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1550 /*
1551 * Ensure that the received CDB is less than the max (252 + 8) bytes
1552 * for VARIABLE_LENGTH_CMD
1553 */
1554 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1555 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1556 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1557 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1558 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1559 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1560 return -EINVAL;
c66ac9db
NB		 1561 }
1562 /*
1563 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1564 * allocate the additional extended CDB buffer now.. Otherwise
1565 * setup the pointer from __t_task_cdb to t_task_cdb.
1566 */
a1d8b49a
AG		 1567 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1568 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1569 GFP_KERNEL);
6708bb27
AG		 1570 if (!cmd->t_task_cdb) {
1571 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1572 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1573 scsi_command_size(cdb),
a1d8b49a 1574 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1575 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1576 cmd->scsi_sense_reason =
1577 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1578 return -ENOMEM;
c66ac9db
NB		 1579 }
1580 } else
a1d8b49a 1581 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1582 /*
a1d8b49a 1583 * Copy the original CDB into cmd->
c66ac9db 1584 */
a1d8b49a 1585 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1586 /*
1587 * Setup the received CDB based on SCSI defined opcodes and
1588 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1589 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1590 * pointer is expected to be setup before we reach this point.
1591 */
1592 ret = transport_generic_cmd_sequencer(cmd, cdb);
1593 if (ret < 0)
1594 return ret;
1595 /*
1596 * Check for SAM Task Attribute Emulation
1597 */
1598 if (transport_check_alloc_task_attr(cmd) < 0) {
1599 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1600 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1601 return -EINVAL;
c66ac9db
NB		 1602 }
1603 spin_lock(&cmd->se_lun->lun_sep_lock);
1604 if (cmd->se_lun->lun_sep)
1605 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1606 spin_unlock(&cmd->se_lun->lun_sep_lock);
1607 return 0;
1608}
1609EXPORT_SYMBOL(transport_generic_allocate_tasks);
1610
695434e1
NB		 1611/*
1612 * Used by fabric module frontends to queue tasks directly.
1613 * Many only be used from process context only
1614 */
1615int transport_handle_cdb_direct(
1616 struct se_cmd *cmd)
1617{
dd8ae59d
NB		 1618 int ret;
1619
695434e1
NB		 1620 if (!cmd->se_lun) {
1621 dump_stack();
6708bb27 1622 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1623 return -EINVAL;
1624 }
1625 if (in_interrupt()) {
1626 dump_stack();
6708bb27 1627 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1628 " from interrupt context\n");
1629 return -EINVAL;
1630 }
dd8ae59d
NB		 1631 /*
1632 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1633 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1634 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1635 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1636 *
1637 * Also, we don't take cmd->t_state_lock here as we only expect
1638 * this to be called for initial descriptor submission.
1639 */
1640 cmd->t_state = TRANSPORT_NEW_CMD;
1641 atomic_set(&cmd->t_transport_active, 1);
1642 /*
1643 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1644 * so follow TRANSPORT_NEW_CMD processing thread context usage
1645 * and call transport_generic_request_failure() if necessary..
1646 */
1647 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1648 if (ret < 0)
1649 transport_generic_request_failure(cmd);
1650
dd8ae59d 1651 return 0;
695434e1
NB		 1652}
1653EXPORT_SYMBOL(transport_handle_cdb_direct);
1654
c66ac9db
NB		 1655/*
1656 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1657 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1658 * complete setup in TCM process context w/ TFO->new_cmd_map().
1659 */
1660int transport_generic_handle_cdb_map(
1661 struct se_cmd *cmd)
1662{
e3d6f909 1663 if (!cmd->se_lun) {
c66ac9db 1664 dump_stack();
6708bb27 1665 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1666 return -EINVAL;
c66ac9db
NB		 1667 }
1668
f7a5cc0b 1669 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1670 return 0;
1671}
1672EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1673
1674/* transport_generic_handle_data():
1675 *
1676 *
1677 */
1678int transport_generic_handle_data(
1679 struct se_cmd *cmd)
1680{
1681 /*
1682 * For the software fabric case, then we assume the nexus is being
1683 * failed/shutdown when signals are pending from the kthread context
1684 * caller, so we return a failure. For the HW target mode case running
1685 * in interrupt code, the signal_pending() check is skipped.
1686 */
1687 if (!in_interrupt() && signal_pending(current))
e3d6f909 1688 return -EPERM;
c66ac9db
NB		 1689 /*
1690 * If the received CDB has aleady been ABORTED by the generic
1691 * target engine, we now call transport_check_aborted_status()
1692 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1693 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1694 * sequences at this point.
1695 */
1696 if (transport_check_aborted_status(cmd, 1) != 0)
1697 return 0;
1698
f7a5cc0b 1699 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1700 return 0;
1701}
1702EXPORT_SYMBOL(transport_generic_handle_data);
1703
1704/* transport_generic_handle_tmr():
1705 *
1706 *
1707 */
1708int transport_generic_handle_tmr(
1709 struct se_cmd *cmd)
1710{
f7a5cc0b 1711 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1712 return 0;
1713}
1714EXPORT_SYMBOL(transport_generic_handle_tmr);
1715
cdbb70bb
CH		 1716/*
1717 * If the task is active, request it to be stopped and sleep until it
1718 * has completed.
1719 */
1720bool target_stop_task(struct se_task *task, unsigned long *flags)
1721{
1722 struct se_cmd *cmd = task->task_se_cmd;
1723 bool was_active = false;
1724
1725 if (task->task_flags & TF_ACTIVE) {
1726 task->task_flags |= TF_REQUEST_STOP;
1727 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1728
1729 pr_debug("Task %p waiting to complete\n", task);
1730 wait_for_completion(&task->task_stop_comp);
1731 pr_debug("Task %p stopped successfully\n", task);
1732
1733 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1734 atomic_dec(&cmd->t_task_cdbs_left);
1735 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1736 was_active = true;
1737 }
1738
cdbb70bb
CH		 1739 return was_active;
1740}
1741
c66ac9db
NB		 1742static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1743{
1744 struct se_task *task, *task_tmp;
1745 unsigned long flags;
1746 int ret = 0;
1747
6708bb27 1748 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1749 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1750
1751 /*
1752 * No tasks remain in the execution queue
1753 */
a1d8b49a 1754 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1755 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1756 &cmd->t_task_list, t_list) {
04629b7b 1757 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1758 /*
1759 * If the struct se_task has not been sent and is not active,
1760 * remove the struct se_task from the execution queue.
1761 */
6c76bf95 1762 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1763 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1764 flags);
1765 transport_remove_task_from_execute_queue(task,
42bf829e 1766 cmd->se_dev);
c66ac9db 1767
04629b7b 1768 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1769 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1770 continue;
1771 }
1772
cdbb70bb 1773 if (!target_stop_task(task, &flags)) {
04629b7b 1774 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1775 ret++;
1776 }
c66ac9db 1777 }
a1d8b49a 1778 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1779
1780 return ret;
1781}
1782
c66ac9db
NB		 1783/*
1784 * Handle SAM-esque emulation for generic transport request failures.
1785 */
03e98c9e 1786static void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1787{
07bde79a
NB		 1788 int ret = 0;
1789
6708bb27 1790 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1791 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1792 cmd->t_task_cdb[0]);
03e98c9e 1793 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1794 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1795 cmd->t_state, cmd->scsi_sense_reason);
6708bb27 1796 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1797 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1798 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1799 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1800 atomic_read(&cmd->t_task_cdbs_left),
1801 atomic_read(&cmd->t_task_cdbs_sent),
1802 atomic_read(&cmd->t_task_cdbs_ex_left),
1803 atomic_read(&cmd->t_transport_active),
1804 atomic_read(&cmd->t_transport_stop),
1805 atomic_read(&cmd->t_transport_sent));
c66ac9db 1806
c66ac9db
NB		 1807 /*
1808 * For SAM Task Attribute emulation for failed struct se_cmd
1809 */
1810 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1811 transport_complete_task_attr(cmd);
1812
03e98c9e
NB		 1813 switch (cmd->scsi_sense_reason) {
1814 case TCM_NON_EXISTENT_LUN:
1815 case TCM_UNSUPPORTED_SCSI_OPCODE:
1816 case TCM_INVALID_CDB_FIELD:
1817 case TCM_INVALID_PARAMETER_LIST:
1818 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1819 case TCM_UNKNOWN_MODE_PAGE:
1820 case TCM_WRITE_PROTECTED:
1821 case TCM_CHECK_CONDITION_ABORT_CMD:
1822 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1823 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1824 break;
03e98c9e 1825 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1826 /*
1827 * No SENSE Data payload for this case, set SCSI Status
1828 * and queue the response to $FABRIC_MOD.
1829 *
1830 * Uses linux/include/scsi/scsi.h SAM status codes defs
1831 */
1832 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1833 /*
1834 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1835 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1836 * CONFLICT STATUS.
1837 *
1838 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1839 */
e3d6f909
AG		 1840 if (cmd->se_sess &&
1841 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1842 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1843 cmd->orig_fe_lun, 0x2C,
1844 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1845
07bde79a 1846 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1847 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1848 goto queue_full;
c66ac9db 1849 goto check_stop;
c66ac9db 1850 default:
6708bb27 1851 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1852 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1853 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1854 break;
1855 }
16ab8e60
NB		 1856 /*
1857 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1858 * make the call to transport_send_check_condition_and_sense()
1859 * directly. Otherwise expect the fabric to make the call to
1860 * transport_send_check_condition_and_sense() after handling
1861 * possible unsoliticied write data payloads.
1862 */
03e98c9e
NB		 1863 ret = transport_send_check_condition_and_sense(cmd,
1864 cmd->scsi_sense_reason, 0);
1865 if (ret == -EAGAIN || ret == -ENOMEM)
1866 goto queue_full;
07bde79a 1867
c66ac9db
NB		 1868check_stop:
1869 transport_lun_remove_cmd(cmd);
6708bb27 1870 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1871 ;
07bde79a
NB		 1872 return;
1873
1874queue_full:
e057f533
CH		 1875 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1876 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1877}
1878
c66ac9db
NB		 1879static inline u32 transport_lba_21(unsigned char *cdb)
1880{
1881 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1882}
1883
1884static inline u32 transport_lba_32(unsigned char *cdb)
1885{
1886 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1887}
1888
1889static inline unsigned long long transport_lba_64(unsigned char *cdb)
1890{
1891 unsigned int __v1, __v2;
1892
1893 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1894 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1895
1896 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1897}
1898
1899/*
1900 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1901 */
1902static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1903{
1904 unsigned int __v1, __v2;
1905
1906 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1907 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1908
1909 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1910}
1911
1912static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1913{
1914 unsigned long flags;
1915
a1d8b49a 1916 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 1917 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 1918 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 1919}
1920
c66ac9db
NB		 1921static inline int transport_tcq_window_closed(struct se_device *dev)
1922{
1923 if (dev->dev_tcq_window_closed++ <
1924 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1925 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1926 } else
1927 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1928
e3d6f909 1929 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 1930 return 0;
1931}
1932
1933/*
1934 * Called from Fabric Module context from transport_execute_tasks()
1935 *
1936 * The return of this function determins if the tasks from struct se_cmd
1937 * get added to the execution queue in transport_execute_tasks(),
1938 * or are added to the delayed or ordered lists here.
1939 */
1940static inline int transport_execute_task_attr(struct se_cmd *cmd)
1941{
5951146d 1942 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1943 return 1;
1944 /*
25985edc 1945 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1946 * to allow the passed struct se_cmd list of tasks to the front of the list.
1947 */
e66ecd50 1948 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
6708bb27 1949 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 1950 " 0x%02x, se_ordered_id: %u\n",
6708bb27 1951 cmd->t_task_cdb[0],
c66ac9db
NB		 1952 cmd->se_ordered_id);
1953 return 1;
e66ecd50 1954 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d 1955 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 1956 smp_mb__after_atomic_inc();
1957
6708bb27 1958 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 1959 " list, se_ordered_id: %u\n",
a1d8b49a 1960 cmd->t_task_cdb[0],
c66ac9db
NB		 1961 cmd->se_ordered_id);
1962 /*
1963 * Add ORDERED command to tail of execution queue if
1964 * no other older commands exist that need to be
1965 * completed first.
1966 */
6708bb27 1967 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 1968 return 1;
1969 } else {
1970 /*
1971 * For SIMPLE and UNTAGGED Task Attribute commands
1972 */
5951146d 1973 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 1974 smp_mb__after_atomic_inc();
1975 }
1976 /*
1977 * Otherwise if one or more outstanding ORDERED task attribute exist,
1978 * add the dormant task(s) built for the passed struct se_cmd to the
1979 * execution queue and become in Active state for this struct se_device.
1980 */
5951146d 1981 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 1982 /*
1983 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 1984 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 1985 */
5951146d 1986 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 1987 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 1988 list_add_tail(&cmd->se_delayed_node,
1989 &cmd->se_dev->delayed_cmd_list);
1990 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 1991
6708bb27 1992 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 1993 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 1994 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 1995 cmd->se_ordered_id);
1996 /*
1997 * Return zero to let transport_execute_tasks() know
1998 * not to add the delayed tasks to the execution list.
1999 */
2000 return 0;
2001 }
2002 /*
2003 * Otherwise, no ORDERED task attributes exist..
2004 */
2005 return 1;
2006}
2007
2008/*
2009 * Called from fabric module context in transport_generic_new_cmd() and
2010 * transport_generic_process_write()
2011 */
2012static int transport_execute_tasks(struct se_cmd *cmd)
2013{
2014 int add_tasks;
2015
58a2801a 2016 if (se_dev_check_online(cmd->se_dev) != 0) {
03e98c9e
NB		 2017 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2018 transport_generic_request_failure(cmd);
db1620a2 2019 return 0;
c66ac9db 2020 }
db1620a2 2021
c66ac9db
NB		 2022 /*
2023 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2024 * has occurred that prevents execution.
c66ac9db 2025 */
6708bb27 2026 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2027 /*
2028 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2029 * attribute for the tasks of the received struct se_cmd CDB
2030 */
2031 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2032 if (!add_tasks)
c66ac9db
NB		 2033 goto execute_tasks;
2034 /*
2035 * This calls transport_add_tasks_from_cmd() to handle
2036 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2037 * (if enabled) in __transport_add_task_to_execute_queue() and
2038 * transport_add_task_check_sam_attr().
2039 */
2040 transport_add_tasks_from_cmd(cmd);
2041 }
2042 /*
2043 * Kick the execution queue for the cmd associated struct se_device
2044 * storage object.
2045 */
2046execute_tasks:
5951146d 2047 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2048 return 0;
2049}
2050
2051/*
2052 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2053 * from struct se_device->execute_task_list and
2054 *
2055 * Called from transport_processing_thread()
2056 */
2057static int __transport_execute_tasks(struct se_device *dev)
2058{
2059 int error;
2060 struct se_cmd *cmd = NULL;
e3d6f909 2061 struct se_task *task = NULL;
c66ac9db
NB		 2062 unsigned long flags;
2063
2064 /*
2065 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2066 * struct se_tasks to the selected transport.
c66ac9db
NB		 2067 */
2068check_depth:
e3d6f909 2069 if (!atomic_read(&dev->depth_left))
c66ac9db 2070 return transport_tcq_window_closed(dev);
c66ac9db 2071
e3d6f909 2072 dev->dev_tcq_window_closed = 0;
c66ac9db 2073
e3d6f909
AG		 2074 spin_lock_irq(&dev->execute_task_lock);
2075 if (list_empty(&dev->execute_task_list)) {
2076 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2077 return 0;
2078 }
e3d6f909
AG		 2079 task = list_first_entry(&dev->execute_task_list,
2080 struct se_task, t_execute_list);
04629b7b 2081 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2082 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2083
2084 atomic_dec(&dev->depth_left);
c66ac9db 2085
e3d6f909 2086 cmd = task->task_se_cmd;
c66ac9db 2087
a1d8b49a 2088 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2089 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2090 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2091
a1d8b49a
AG		 2092 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2093 cmd->t_task_list_num)
415a090a 2094 atomic_set(&cmd->t_transport_sent, 1);
c66ac9db 2095
a1d8b49a 2096 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2097
5bda90c8
CH		 2098 if (cmd->execute_task)
2099 error = cmd->execute_task(task);
2100 else
2101 error = dev->transport->do_task(task);
d29a5b6a 2102 if (error != 0) {
d29a5b6a
CH		 2103 spin_lock_irqsave(&cmd->t_state_lock, flags);
2104 task->task_flags &= ~TF_ACTIVE;
2105 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2106 atomic_set(&cmd->t_transport_sent, 0);
2107 transport_stop_tasks_for_cmd(cmd);
2108 atomic_inc(&dev->depth_left);
03e98c9e 2109 transport_generic_request_failure(cmd);
c66ac9db
NB		 2110 }
2111
2112 goto check_depth;
2113
2114 return 0;
2115}
2116
c66ac9db
NB		 2117static inline u32 transport_get_sectors_6(
2118 unsigned char *cdb,
2119 struct se_cmd *cmd,
2120 int *ret)
2121{
5951146d 2122 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2123
2124 /*
2125 * Assume TYPE_DISK for non struct se_device objects.
2126 * Use 8-bit sector value.
2127 */
2128 if (!dev)
2129 goto type_disk;
2130
2131 /*
2132 * Use 24-bit allocation length for TYPE_TAPE.
2133 */
e3d6f909 2134 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2135 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2136
2137 /*
2138 * Everything else assume TYPE_DISK Sector CDB location.
9b5cd7f3
RD		 2139 * Use 8-bit sector value. SBC-3 says:
2140 *
2141 * A TRANSFER LENGTH field set to zero specifies that 256
2142 * logical blocks shall be written. Any other value
2143 * specifies the number of logical blocks that shall be
2144 * written.
c66ac9db
NB		 2145 */
2146type_disk:
9b5cd7f3 2147 return cdb[4] ? : 256;
c66ac9db
NB		 2148}
2149
2150static inline u32 transport_get_sectors_10(
2151 unsigned char *cdb,
2152 struct se_cmd *cmd,
2153 int *ret)
2154{
5951146d 2155 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2156
2157 /*
2158 * Assume TYPE_DISK for non struct se_device objects.
2159 * Use 16-bit sector value.
2160 */
2161 if (!dev)
2162 goto type_disk;
2163
2164 /*
2165 * XXX_10 is not defined in SSC, throw an exception
2166 */
e3d6f909
AG		 2167 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2168 *ret = -EINVAL;
c66ac9db
NB		 2169 return 0;
2170 }
2171
2172 /*
2173 * Everything else assume TYPE_DISK Sector CDB location.
2174 * Use 16-bit sector value.
2175 */
2176type_disk:
2177 return (u32)(cdb[7] << 8) + cdb[8];
2178}
2179
2180static inline u32 transport_get_sectors_12(
2181 unsigned char *cdb,
2182 struct se_cmd *cmd,
2183 int *ret)
2184{
5951146d 2185 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2186
2187 /*
2188 * Assume TYPE_DISK for non struct se_device objects.
2189 * Use 32-bit sector value.
2190 */
2191 if (!dev)
2192 goto type_disk;
2193
2194 /*
2195 * XXX_12 is not defined in SSC, throw an exception
2196 */
e3d6f909
AG		 2197 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2198 *ret = -EINVAL;
c66ac9db
NB		 2199 return 0;
2200 }
2201
2202 /*
2203 * Everything else assume TYPE_DISK Sector CDB location.
2204 * Use 32-bit sector value.
2205 */
2206type_disk:
2207 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2208}
2209
2210static inline u32 transport_get_sectors_16(
2211 unsigned char *cdb,
2212 struct se_cmd *cmd,
2213 int *ret)
2214{
5951146d 2215 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2216
2217 /*
2218 * Assume TYPE_DISK for non struct se_device objects.
2219 * Use 32-bit sector value.
2220 */
2221 if (!dev)
2222 goto type_disk;
2223
2224 /*
2225 * Use 24-bit allocation length for TYPE_TAPE.
2226 */
e3d6f909 2227 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2228 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2229
2230type_disk:
2231 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2232 (cdb[12] << 8) + cdb[13];
2233}
2234
2235/*
2236 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2237 */
2238static inline u32 transport_get_sectors_32(
2239 unsigned char *cdb,
2240 struct se_cmd *cmd,
2241 int *ret)
2242{
2243 /*
2244 * Assume TYPE_DISK for non struct se_device objects.
2245 * Use 32-bit sector value.
2246 */
2247 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2248 (cdb[30] << 8) + cdb[31];
2249
2250}
2251
2252static inline u32 transport_get_size(
2253 u32 sectors,
2254 unsigned char *cdb,
2255 struct se_cmd *cmd)
2256{
5951146d 2257 struct se_device *dev = cmd->se_dev;
c66ac9db 2258
e3d6f909 2259 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2260 if (cdb[1] & 1) { /* sectors */
e3d6f909 2261 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2262 } else /* bytes */
2263 return sectors;
2264 }
2265#if 0
6708bb27 2266 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2267 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2268 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2269 dev->transport->name);
c66ac9db 2270#endif
e3d6f909 2271 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2272}
2273
c66ac9db
NB		 2274static void transport_xor_callback(struct se_cmd *cmd)
2275{
2276 unsigned char *buf, *addr;
ec98f782 2277 struct scatterlist *sg;
c66ac9db
NB		 2278 unsigned int offset;
2279 int i;
ec98f782 2280 int count;
c66ac9db
NB		 2281 /*
2282 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2283 *
2284 * 1) read the specified logical block(s);
2285 * 2) transfer logical blocks from the data-out buffer;
2286 * 3) XOR the logical blocks transferred from the data-out buffer with
2287 * the logical blocks read, storing the resulting XOR data in a buffer;
2288 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2289 * blocks transferred from the data-out buffer; and
2290 * 5) transfer the resulting XOR data to the data-in buffer.
2291 */
2292 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2293 if (!buf) {
2294 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2295 return;
2296 }
2297 /*
ec98f782 2298 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2299 * into the locally allocated *buf
2300 */
ec98f782
AG		 2301 sg_copy_to_buffer(cmd->t_data_sg,
2302 cmd->t_data_nents,
2303 buf,
2304 cmd->data_length);
2305
c66ac9db
NB		 2306 /*
2307 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2308 * cmd->t_mem_bidi_list
c66ac9db
NB		 2309 */
2310
2311 offset = 0;
ec98f782
AG		 2312 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2313 addr = kmap_atomic(sg_page(sg), KM_USER0);
2314 if (!addr)
c66ac9db
NB		 2315 goto out;
2316
ec98f782
AG		 2317 for (i = 0; i < sg->length; i++)
2318 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2319
ec98f782 2320 offset += sg->length;
c66ac9db
NB		 2321 kunmap_atomic(addr, KM_USER0);
2322 }
ec98f782 2323
c66ac9db
NB		 2324out:
2325 kfree(buf);
2326}
2327
2328/*
2329 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2330 */
2331static int transport_get_sense_data(struct se_cmd *cmd)
2332{
2333 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2334 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2335 struct se_task *task = NULL, *task_tmp;
2336 unsigned long flags;
2337 u32 offset = 0;
2338
e3d6f909
AG		 2339 WARN_ON(!cmd->se_lun);
2340
42bf829e
CH		 2341 if (!dev)
2342 return 0;
2343
a1d8b49a 2344 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2345 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2346 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2347 return 0;
2348 }
2349
2350 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2351 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2352 if (!task->task_sense)
2353 continue;
2354
e3d6f909 2355 if (!dev->transport->get_sense_buffer) {
6708bb27 2356 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2357 " is NULL\n");
2358 continue;
2359 }
2360
e3d6f909 2361 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2362 if (!sense_buffer) {
04629b7b 2363 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2364 " sense buffer for task with sense\n",
04629b7b 2365 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2366 continue;
2367 }
a1d8b49a 2368 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2369
e3d6f909 2370 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2371 TRANSPORT_SENSE_BUFFER);
2372
5951146d 2373 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2374 TRANSPORT_SENSE_BUFFER);
2375 cmd->scsi_status = task->task_scsi_status;
2376 /* Automatically padded */
2377 cmd->scsi_sense_length =
2378 (TRANSPORT_SENSE_BUFFER + offset);
2379
6708bb27 2380 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2381 " and sense\n",
e3d6f909 2382 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2383 cmd->scsi_status);
2384 return 0;
2385 }
a1d8b49a 2386 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2387
2388 return -1;
2389}
2390
ec98f782
AG		 2391static inline long long transport_dev_end_lba(struct se_device *dev)
2392{
2393 return dev->transport->get_blocks(dev) + 1;
2394}
2395
2396static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2397{
2398 struct se_device *dev = cmd->se_dev;
2399 u32 sectors;
2400
2401 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2402 return 0;
2403
2404 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2405
6708bb27
AG		 2406 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2407 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2408 " transport_dev_end_lba(): %llu\n",
2409 cmd->t_task_lba, sectors,
2410 transport_dev_end_lba(dev));
7abbe7f3 2411 return -EINVAL;
ec98f782
AG		 2412 }
2413
7abbe7f3 2414 return 0;
ec98f782
AG		 2415}
2416
706d5860
NB		 2417static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2418{
2419 /*
2420 * Determine if the received WRITE_SAME is used to for direct
2421 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2422 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2423 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2424 */
2425 int passthrough = (dev->transport->transport_type ==
2426 TRANSPORT_PLUGIN_PHBA_PDEV);
2427
2428 if (!passthrough) {
2429 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2430 pr_err("WRITE_SAME PBDATA and LBDATA"
2431 " bits not supported for Block Discard"
2432 " Emulation\n");
2433 return -ENOSYS;
2434 }
2435 /*
2436 * Currently for the emulated case we only accept
2437 * tpws with the UNMAP=1 bit set.
2438 */
2439 if (!(flags[0] & 0x08)) {
2440 pr_err("WRITE_SAME w/o UNMAP bit not"
2441 " supported for Block Discard Emulation\n");
2442 return -ENOSYS;
2443 }
2444 }
2445
2446 return 0;
2447}
2448
c66ac9db
NB		 2449/* transport_generic_cmd_sequencer():
2450 *
2451 * Generic Command Sequencer that should work for most DAS transport
2452 * drivers.
2453 *
2454 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2455 * RX Thread.
2456 *
2457 * FIXME: Need to support other SCSI OPCODES where as well.
2458 */
2459static int transport_generic_cmd_sequencer(
2460 struct se_cmd *cmd,
2461 unsigned char *cdb)
2462{
5951146d 2463 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2464 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2465 int ret = 0, sector_ret = 0, passthrough;
2466 u32 sectors = 0, size = 0, pr_reg_type = 0;
2467 u16 service_action;
2468 u8 alua_ascq = 0;
2469 /*
2470 * Check for an existing UNIT ATTENTION condition
2471 */
2472 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2473 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2474 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2475 return -EINVAL;
c66ac9db
NB		 2476 }
2477 /*
2478 * Check status of Asymmetric Logical Unit Assignment port
2479 */
e3d6f909 2480 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2481 if (ret != 0) {
c66ac9db 2482 /*
25985edc 2483 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2484 * The ALUA additional sense code qualifier (ASCQ) is determined
2485 * by the ALUA primary or secondary access state..
2486 */
2487 if (ret > 0) {
2488#if 0
6708bb27 2489 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2490 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2491 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2492#endif
2493 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2494 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2495 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2496 return -EINVAL;
c66ac9db
NB		 2497 }
2498 goto out_invalid_cdb_field;
2499 }
2500 /*
2501 * Check status for SPC-3 Persistent Reservations
2502 */
e3d6f909
AG		 2503 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2504 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2505 cmd, cdb, pr_reg_type) != 0) {
2506 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2507 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2508 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2509 return -EBUSY;
2510 }
c66ac9db
NB		 2511 /*
2512 * This means the CDB is allowed for the SCSI Initiator port
2513 * when said port is *NOT* holding the legacy SPC-2 or
2514 * SPC-3 Persistent Reservation.
2515 */
2516 }
2517
5bda90c8
CH		 2518 /*
2519 * If we operate in passthrough mode we skip most CDB emulation and
2520 * instead hand the commands down to the physical SCSI device.
2521 */
2522 passthrough =
2523 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2524
c66ac9db
NB		 2525 switch (cdb[0]) {
2526 case READ_6:
2527 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2528 if (sector_ret)
2529 goto out_unsupported_cdb;
2530 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2531 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2532 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2533 break;
2534 case READ_10:
2535 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2536 if (sector_ret)
2537 goto out_unsupported_cdb;
2538 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2539 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2540 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2541 break;
2542 case READ_12:
2543 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2544 if (sector_ret)
2545 goto out_unsupported_cdb;
2546 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2547 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2548 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2549 break;
2550 case READ_16:
2551 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2552 if (sector_ret)
2553 goto out_unsupported_cdb;
2554 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2555 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2556 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2557 break;
2558 case WRITE_6:
2559 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2560 if (sector_ret)
2561 goto out_unsupported_cdb;
2562 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2563 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2564 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2565 break;
2566 case WRITE_10:
2567 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2568 if (sector_ret)
2569 goto out_unsupported_cdb;
2570 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2571 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2572 if (cdb[1] & 0x8)
2573 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2574 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2575 break;
2576 case WRITE_12:
2577 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2578 if (sector_ret)
2579 goto out_unsupported_cdb;
2580 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2581 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2582 if (cdb[1] & 0x8)
2583 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2584 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2585 break;
2586 case WRITE_16:
2587 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2588 if (sector_ret)
2589 goto out_unsupported_cdb;
2590 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2591 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2592 if (cdb[1] & 0x8)
2593 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2594 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2595 break;
2596 case XDWRITEREAD_10:
2597 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2598 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2599 goto out_invalid_cdb_field;
2600 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2601 if (sector_ret)
2602 goto out_unsupported_cdb;
2603 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2604 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2605 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2606
5bda90c8
CH		 2607 /*
2608 * Do now allow BIDI commands for passthrough mode.
2609 */
2610 if (passthrough)
7c1c6af3 2611 goto out_unsupported_cdb;
5bda90c8 2612
c66ac9db 2613 /*
35e0e757 2614 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2615 */
2616 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2617 if (cdb[1] & 0x8)
2618 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2619 break;
2620 case VARIABLE_LENGTH_CMD:
2621 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2622 switch (service_action) {
2623 case XDWRITEREAD_32:
2624 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2625 if (sector_ret)
2626 goto out_unsupported_cdb;
2627 size = transport_get_size(sectors, cdb, cmd);
2628 /*
2629 * Use WRITE_32 and READ_32 opcodes for the emulated
2630 * XDWRITE_READ_32 logic.
2631 */
a1d8b49a 2632 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2633 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2634
5bda90c8
CH		 2635 /*
2636 * Do now allow BIDI commands for passthrough mode.
2637 */
c66ac9db 2638 if (passthrough)
7c1c6af3 2639 goto out_unsupported_cdb;
5bda90c8 2640
c66ac9db 2641 /*
35e0e757
CH		 2642 * Setup BIDI XOR callback to be run during after I/O
2643 * completion.
c66ac9db
NB		 2644 */
2645 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2646 if (cdb[1] & 0x8)
2647 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2648 break;
2649 case WRITE_SAME_32:
2650 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2651 if (sector_ret)
2652 goto out_unsupported_cdb;
dd3a5ad8 2653
6708bb27 2654 if (sectors)
12850626 2655 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2656 else {
2657 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2658 " supported\n");
2659 goto out_invalid_cdb_field;
2660 }
dd3a5ad8 2661
a1d8b49a 2662 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2663 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2664
706d5860 2665 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2666 goto out_invalid_cdb_field;
5bda90c8
CH		 2667 if (!passthrough)
2668 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2669 break;
2670 default:
6708bb27 2671 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2672 " 0x%04x not supported\n", service_action);
2673 goto out_unsupported_cdb;
2674 }
2675 break;
e434f1f1 2676 case MAINTENANCE_IN:
e3d6f909 2677 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2678 /* MAINTENANCE_IN from SCC-2 */
2679 /*
2680 * Check for emulated MI_REPORT_TARGET_PGS.
2681 */
e76a35d6
CH		 2682 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2683 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2684 cmd->execute_task =
2685 target_emulate_report_target_port_groups;
c66ac9db
NB		 2686 }
2687 size = (cdb[6] << 24) | (cdb[7] << 16) |
2688 (cdb[8] << 8) | cdb[9];
2689 } else {
2690 /* GPCMD_SEND_KEY from multi media commands */
2691 size = (cdb[8] << 8) + cdb[9];
2692 }
05d1c7c0 2693 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2694 break;
2695 case MODE_SELECT:
2696 size = cdb[4];
2697 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2698 break;
2699 case MODE_SELECT_10:
2700 size = (cdb[7] << 8) + cdb[8];
2701 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2702 break;
2703 case MODE_SENSE:
2704 size = cdb[4];
05d1c7c0 2705 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2706 if (!passthrough)
2707 cmd->execute_task = target_emulate_modesense;
c66ac9db
NB		 2708 break;
2709 case MODE_SENSE_10:
5bda90c8
CH		 2710 size = (cdb[7] << 8) + cdb[8];
2711 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2712 if (!passthrough)
2713 cmd->execute_task = target_emulate_modesense;
2714 break;
c66ac9db
NB		 2715 case GPCMD_READ_BUFFER_CAPACITY:
2716 case GPCMD_SEND_OPC:
2717 case LOG_SELECT:
2718 case LOG_SENSE:
2719 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2720 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2721 break;
2722 case READ_BLOCK_LIMITS:
2723 size = READ_BLOCK_LEN;
05d1c7c0 2724 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2725 break;
2726 case GPCMD_GET_CONFIGURATION:
2727 case GPCMD_READ_FORMAT_CAPACITIES:
2728 case GPCMD_READ_DISC_INFO:
2729 case GPCMD_READ_TRACK_RZONE_INFO:
2730 size = (cdb[7] << 8) + cdb[8];
2731 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2732 break;
2733 case PERSISTENT_RESERVE_IN:
617c0e06 2734 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2735 cmd->execute_task = target_scsi3_emulate_pr_in;
617c0e06
CH		 2736 size = (cdb[7] << 8) + cdb[8];
2737 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2738 break;
c66ac9db 2739 case PERSISTENT_RESERVE_OUT:
617c0e06 2740 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2741 cmd->execute_task = target_scsi3_emulate_pr_out;
c66ac9db 2742 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2743 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2744 break;
2745 case GPCMD_MECHANISM_STATUS:
2746 case GPCMD_READ_DVD_STRUCTURE:
2747 size = (cdb[8] << 8) + cdb[9];
2748 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2749 break;
2750 case READ_POSITION:
2751 size = READ_POSITION_LEN;
05d1c7c0 2752 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2753 break;
e434f1f1 2754 case MAINTENANCE_OUT:
e3d6f909 2755 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2756 /* MAINTENANCE_OUT from SCC-2
2757 *
2758 * Check for emulated MO_SET_TARGET_PGS.
2759 */
e76a35d6
CH		 2760 if (cdb[1] == MO_SET_TARGET_PGS &&
2761 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2762 cmd->execute_task =
2763 target_emulate_set_target_port_groups;
c66ac9db
NB		 2764 }
2765
2766 size = (cdb[6] << 24) | (cdb[7] << 16) |
2767 (cdb[8] << 8) | cdb[9];
2768 } else {
2769 /* GPCMD_REPORT_KEY from multi media commands */
2770 size = (cdb[8] << 8) + cdb[9];
2771 }
05d1c7c0 2772 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2773 break;
2774 case INQUIRY:
2775 size = (cdb[3] << 8) + cdb[4];
2776 /*
2777 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2778 * See spc4r17 section 5.3
2779 */
5951146d 2780 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2781 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2782 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2783 if (!passthrough)
2784 cmd->execute_task = target_emulate_inquiry;
c66ac9db
NB		 2785 break;
2786 case READ_BUFFER:
2787 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2788 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2789 break;
2790 case READ_CAPACITY:
2791 size = READ_CAP_LEN;
05d1c7c0 2792 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2793 if (!passthrough)
2794 cmd->execute_task = target_emulate_readcapacity;
c66ac9db
NB		 2795 break;
2796 case READ_MEDIA_SERIAL_NUMBER:
2797 case SECURITY_PROTOCOL_IN:
2798 case SECURITY_PROTOCOL_OUT:
2799 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2800 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2801 break;
2802 case SERVICE_ACTION_IN:
5bda90c8
CH		 2803 switch (cmd->t_task_cdb[1] & 0x1f) {
2804 case SAI_READ_CAPACITY_16:
2805 if (!passthrough)
2806 cmd->execute_task =
2807 target_emulate_readcapacity_16;
2808 break;
2809 default:
2810 if (passthrough)
2811 break;
2812
2813 pr_err("Unsupported SA: 0x%02x\n",
2814 cmd->t_task_cdb[1] & 0x1f);
2815 goto out_unsupported_cdb;
2816 }
2817 /*FALLTHROUGH*/
c66ac9db
NB		 2818 case ACCESS_CONTROL_IN:
2819 case ACCESS_CONTROL_OUT:
2820 case EXTENDED_COPY:
2821 case READ_ATTRIBUTE:
2822 case RECEIVE_COPY_RESULTS:
2823 case WRITE_ATTRIBUTE:
2824 size = (cdb[10] << 24) | (cdb[11] << 16) |
2825 (cdb[12] << 8) | cdb[13];
05d1c7c0 2826 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2827 break;
2828 case RECEIVE_DIAGNOSTIC:
2829 case SEND_DIAGNOSTIC:
2830 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2831 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2832 break;
2833/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2834#if 0
2835 case GPCMD_READ_CD:
2836 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2837 size = (2336 * sectors);
05d1c7c0 2838 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2839 break;
2840#endif
2841 case READ_TOC:
2842 size = cdb[8];
05d1c7c0 2843 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2844 break;
2845 case REQUEST_SENSE:
2846 size = cdb[4];
05d1c7c0 2847 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2848 if (!passthrough)
2849 cmd->execute_task = target_emulate_request_sense;
c66ac9db
NB		 2850 break;
2851 case READ_ELEMENT_STATUS:
2852 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2853 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2854 break;
2855 case WRITE_BUFFER:
2856 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2857 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2858 break;
2859 case RESERVE:
2860 case RESERVE_10:
2861 /*
2862 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2863 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2864 */
2865 if (cdb[0] == RESERVE_10)
2866 size = (cdb[7] << 8) | cdb[8];
2867 else
2868 size = cmd->data_length;
2869
2870 /*
2871 * Setup the legacy emulated handler for SPC-2 and
2872 * >= SPC-3 compatible reservation handling (CRH=1)
2873 * Otherwise, we assume the underlying SCSI logic is
2874 * is running in SPC_PASSTHROUGH, and wants reservations
2875 * emulation disabled.
2876 */
e76a35d6
CH		 2877 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2878 cmd->execute_task = target_scsi2_reservation_reserve;
c66ac9db
NB		 2879 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2880 break;
2881 case RELEASE:
2882 case RELEASE_10:
2883 /*
2884 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2885 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2886 */
2887 if (cdb[0] == RELEASE_10)
2888 size = (cdb[7] << 8) | cdb[8];
2889 else
2890 size = cmd->data_length;
2891
e76a35d6
CH		 2892 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2893 cmd->execute_task = target_scsi2_reservation_release;
c66ac9db
NB		 2894 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2895 break;
2896 case SYNCHRONIZE_CACHE:
2897 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2898 /*
2899 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2900 */
2901 if (cdb[0] == SYNCHRONIZE_CACHE) {
2902 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2903 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2904 } else {
2905 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2906 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2907 }
2908 if (sector_ret)
2909 goto out_unsupported_cdb;
2910
2911 size = transport_get_size(sectors, cdb, cmd);
2912 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2913
5bda90c8 2914 if (passthrough)
c66ac9db 2915 break;
5bda90c8 2916
c66ac9db
NB		 2917 /*
2918 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 2919 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 2920 */
7abbe7f3
NB		 2921 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2922 if (transport_cmd_get_valid_sectors(cmd) < 0)
2923 goto out_invalid_cdb_field;
2924 }
5bda90c8 2925 cmd->execute_task = target_emulate_synchronize_cache;
c66ac9db
NB		 2926 break;
2927 case UNMAP:
2928 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 2929 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2930 if (!passthrough)
2931 cmd->execute_task = target_emulate_unmap;
c66ac9db
NB		 2932 break;
2933 case WRITE_SAME_16:
2934 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2935 if (sector_ret)
2936 goto out_unsupported_cdb;
dd3a5ad8 2937
6708bb27 2938 if (sectors)
12850626 2939 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2940 else {
2941 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2942 goto out_invalid_cdb_field;
2943 }
dd3a5ad8 2944
5db0753b 2945 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 2946 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2947
2948 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2949 goto out_invalid_cdb_field;
5bda90c8
CH		 2950 if (!passthrough)
2951 cmd->execute_task = target_emulate_write_same;
706d5860
NB		 2952 break;
2953 case WRITE_SAME:
2954 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2955 if (sector_ret)
2956 goto out_unsupported_cdb;
2957
2958 if (sectors)
12850626 2959 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 2960 else {
2961 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2962 goto out_invalid_cdb_field;
c66ac9db 2963 }
706d5860
NB		 2964
2965 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 2966 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 2967 /*
2968 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2969 * of byte 1 bit 3 UNMAP instead of original reserved field
2970 */
2971 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2972 goto out_invalid_cdb_field;
5bda90c8
CH		 2973 if (!passthrough)
2974 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2975 break;
2976 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 2977 case ERASE:
c66ac9db
NB		 2978 case REZERO_UNIT:
2979 case SEEK_10:
c66ac9db
NB		 2980 case SPACE:
2981 case START_STOP:
2982 case TEST_UNIT_READY:
2983 case VERIFY:
2984 case WRITE_FILEMARKS:
5bda90c8
CH		 2985 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2986 if (!passthrough)
2987 cmd->execute_task = target_emulate_noop;
2988 break;
2989 case GPCMD_CLOSE_TRACK:
2990 case INITIALIZE_ELEMENT_STATUS:
2991 case GPCMD_LOAD_UNLOAD:
2992 case GPCMD_SET_SPEED:
c66ac9db
NB		 2993 case MOVE_MEDIUM:
2994 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2995 break;
2996 case REPORT_LUNS:
e76a35d6 2997 cmd->execute_task = target_report_luns;
c66ac9db
NB		 2998 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2999 /*
3000 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3001 * See spc4r17 section 5.3
3002 */
5951146d 3003 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3004 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3005 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3006 break;
3007 default:
6708bb27 3008 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3009 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3010 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3011 goto out_unsupported_cdb;
3012 }
3013
3014 if (size != cmd->data_length) {
6708bb27 3015 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3016 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3017 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3018 cmd->data_length, size, cdb[0]);
3019
3020 cmd->cmd_spdtl = size;
3021
3022 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3023 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3024 " WRITE data\n");
3025 goto out_invalid_cdb_field;
3026 }
3027 /*
3028 * Reject READ_* or WRITE_* with overflow/underflow for
3029 * type SCF_SCSI_DATA_SG_IO_CDB.
3030 */
6708bb27
AG		 3031 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3032 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3033 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3034 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3035 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3036 goto out_invalid_cdb_field;
3037 }
3038
3039 if (size > cmd->data_length) {
3040 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3041 cmd->residual_count = (size - cmd->data_length);
3042 } else {
3043 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3044 cmd->residual_count = (cmd->data_length - size);
3045 }
3046 cmd->data_length = size;
3047 }
3048
5bda90c8
CH		 3049 /* reject any command that we don't have a handler for */
3050 if (!(passthrough || cmd->execute_task ||
3051 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3052 goto out_unsupported_cdb;
3053
d0229ae3
AG		 3054 /* Let's limit control cdbs to a page, for simplicity's sake. */
3055 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3056 size > PAGE_SIZE)
3057 goto out_invalid_cdb_field;
3058
c66ac9db
NB		 3059 transport_set_supported_SAM_opcode(cmd);
3060 return ret;
3061
3062out_unsupported_cdb:
3063 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3064 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3065 return -EINVAL;
c66ac9db
NB		 3066out_invalid_cdb_field:
3067 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3068 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3069 return -EINVAL;
c66ac9db
NB		 3070}
3071
c66ac9db 3072/*
35e0e757 3073 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3074 * and ordered cmds need to have their tasks added to the execution queue.
3075 */
3076static void transport_complete_task_attr(struct se_cmd *cmd)
3077{
5951146d 3078 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3079 struct se_cmd *cmd_p, *cmd_tmp;
3080 int new_active_tasks = 0;
3081
e66ecd50 3082 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3083 atomic_dec(&dev->simple_cmds);
3084 smp_mb__after_atomic_dec();
3085 dev->dev_cur_ordered_id++;
6708bb27 3086 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3087 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3088 cmd->se_ordered_id);
e66ecd50 3089 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3090 dev->dev_cur_ordered_id++;
6708bb27 3091 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3092 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3093 cmd->se_ordered_id);
e66ecd50 3094 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3095 atomic_dec(&dev->dev_ordered_sync);
3096 smp_mb__after_atomic_dec();
c66ac9db
NB		 3097
3098 dev->dev_cur_ordered_id++;
6708bb27 3099 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3100 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3101 }
3102 /*
3103 * Process all commands up to the last received
3104 * ORDERED task attribute which requires another blocking
3105 * boundary
3106 */
3107 spin_lock(&dev->delayed_cmd_lock);
3108 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3109 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3110
5951146d 3111 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3112 spin_unlock(&dev->delayed_cmd_lock);
3113
6708bb27 3114 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3115 " cmd_p: 0x%02x Task Attr: 0x%02x"
3116 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3117 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3118 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3119
3120 transport_add_tasks_from_cmd(cmd_p);
3121 new_active_tasks++;
3122
3123 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3124 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3125 break;
3126 }
3127 spin_unlock(&dev->delayed_cmd_lock);
3128 /*
3129 * If new tasks have become active, wake up the transport thread
3130 * to do the processing of the Active tasks.
3131 */
3132 if (new_active_tasks != 0)
e3d6f909 3133 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3134}
3135
e057f533 3136static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3137{
3138 int ret = 0;
3139
e057f533
CH		 3140 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3141 transport_complete_task_attr(cmd);
3142
3143 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3144 ret = cmd->se_tfo->queue_status(cmd);
3145 if (ret)
3146 goto out;
3147 }
07bde79a
NB		 3148
3149 switch (cmd->data_direction) {
3150 case DMA_FROM_DEVICE:
3151 ret = cmd->se_tfo->queue_data_in(cmd);
3152 break;
3153 case DMA_TO_DEVICE:
ec98f782 3154 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3155 ret = cmd->se_tfo->queue_data_in(cmd);
3156 if (ret < 0)
e057f533 3157 break;
07bde79a
NB		 3158 }
3159 /* Fall through for DMA_TO_DEVICE */
3160 case DMA_NONE:
3161 ret = cmd->se_tfo->queue_status(cmd);
3162 break;
3163 default:
3164 break;
3165 }
3166
e057f533
CH		 3167out:
3168 if (ret < 0) {
3169 transport_handle_queue_full(cmd, cmd->se_dev);
3170 return;
3171 }
3172 transport_lun_remove_cmd(cmd);
3173 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3174}
3175
3176static void transport_handle_queue_full(
3177 struct se_cmd *cmd,
e057f533 3178 struct se_device *dev)
07bde79a
NB		 3179{
3180 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3181 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3182 atomic_inc(&dev->dev_qf_count);
3183 smp_mb__after_atomic_inc();
3184 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3185
3186 schedule_work(&cmd->se_dev->qf_work_queue);
3187}
3188
35e0e757 3189static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3190{
35e0e757 3191 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3192 int reason = 0, ret;
35e0e757 3193
c66ac9db
NB		 3194 /*
3195 * Check if we need to move delayed/dormant tasks from cmds on the
3196 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3197 * Attribute.
3198 */
5951146d 3199 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3200 transport_complete_task_attr(cmd);
07bde79a
NB		 3201 /*
3202 * Check to schedule QUEUE_FULL work, or execute an existing
3203 * cmd->transport_qf_callback()
3204 */
3205 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3206 schedule_work(&cmd->se_dev->qf_work_queue);
3207
c66ac9db
NB		 3208 /*
3209 * Check if we need to retrieve a sense buffer from
3210 * the struct se_cmd in question.
3211 */
3212 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3213 if (transport_get_sense_data(cmd) < 0)
3214 reason = TCM_NON_EXISTENT_LUN;
3215
3216 /*
3217 * Only set when an struct se_task->task_scsi_status returned
3218 * a non GOOD status.
3219 */
3220 if (cmd->scsi_status) {
07bde79a 3221 ret = transport_send_check_condition_and_sense(
c66ac9db 3222 cmd, reason, 1);
f147abb4 3223 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3224 goto queue_full;
3225
c66ac9db
NB		 3226 transport_lun_remove_cmd(cmd);
3227 transport_cmd_check_stop_to_fabric(cmd);
3228 return;
3229 }
3230 }
3231 /*
25985edc 3232 * Check for a callback, used by amongst other things
c66ac9db
NB		 3233 * XDWRITE_READ_10 emulation.
3234 */
3235 if (cmd->transport_complete_callback)
3236 cmd->transport_complete_callback(cmd);
3237
3238 switch (cmd->data_direction) {
3239 case DMA_FROM_DEVICE:
3240 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3241 if (cmd->se_lun->lun_sep) {
3242 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3243 cmd->data_length;
3244 }
3245 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3246
07bde79a 3247 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3248 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3249 goto queue_full;
c66ac9db
NB		 3250 break;
3251 case DMA_TO_DEVICE:
3252 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3253 if (cmd->se_lun->lun_sep) {
3254 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3255 cmd->data_length;
3256 }
3257 spin_unlock(&cmd->se_lun->lun_sep_lock);
3258 /*
3259 * Check if we need to send READ payload for BIDI-COMMAND
3260 */
ec98f782 3261 if (cmd->t_bidi_data_sg) {
c66ac9db 3262 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3263 if (cmd->se_lun->lun_sep) {
3264 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3265 cmd->data_length;
3266 }
3267 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3268 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3269 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3270 goto queue_full;
c66ac9db
NB		 3271 break;
3272 }
3273 /* Fall through for DMA_TO_DEVICE */
3274 case DMA_NONE:
07bde79a 3275 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3276 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3277 goto queue_full;
c66ac9db
NB		 3278 break;
3279 default:
3280 break;
3281 }
3282
3283 transport_lun_remove_cmd(cmd);
3284 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3285 return;
3286
3287queue_full:
6708bb27 3288 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3289 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3290 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3291 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3292}
3293
3294static void transport_free_dev_tasks(struct se_cmd *cmd)
3295{
3296 struct se_task *task, *task_tmp;
3297 unsigned long flags;
0c2cfe5f 3298 LIST_HEAD(dispose_list);
c66ac9db 3299
a1d8b49a 3300 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3301 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3302 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3303 if (!(task->task_flags & TF_ACTIVE))
3304 list_move_tail(&task->t_list, &dispose_list);
3305 }
3306 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3307
3308 while (!list_empty(&dispose_list)) {
3309 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3310
af3f00c7
CH		 3311 if (task->task_sg != cmd->t_data_sg &&
3312 task->task_sg != cmd->t_bidi_data_sg)
3313 kfree(task->task_sg);
c66ac9db
NB		 3314
3315 list_del(&task->t_list);
3316
42bf829e 3317 cmd->se_dev->transport->free_task(task);
c66ac9db 3318 }
c66ac9db
NB		 3319}
3320
6708bb27 3321static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3322{
ec98f782 3323 struct scatterlist *sg;
ec98f782 3324 int count;
c66ac9db 3325
6708bb27
AG		 3326 for_each_sg(sgl, sg, nents, count)
3327 __free_page(sg_page(sg));
c66ac9db 3328
6708bb27
AG		 3329 kfree(sgl);
3330}
c66ac9db 3331
6708bb27
AG		 3332static inline void transport_free_pages(struct se_cmd *cmd)
3333{
3334 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3335 return;
3336
3337 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3338 cmd->t_data_sg = NULL;
3339 cmd->t_data_nents = 0;
c66ac9db 3340
6708bb27 3341 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3342 cmd->t_bidi_data_sg = NULL;
3343 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3344}
3345
e26d99ae
CH		 3346/**
3347 * transport_release_cmd - free a command
3348 * @cmd: command to free
3349 *
3350 * This routine unconditionally frees a command, and reference counting
3351 * or list removal must be done in the caller.
3352 */
3353static void transport_release_cmd(struct se_cmd *cmd)
3354{
3355 BUG_ON(!cmd->se_tfo);
3356
3357 if (cmd->se_tmr_req)
3358 core_tmr_release_req(cmd->se_tmr_req);
3359 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3360 kfree(cmd->t_task_cdb);
3361 /*
3362 * Check if target_wait_for_sess_cmds() is expecting to
3363 * release se_cmd directly here..
3364 */
3365 if (cmd->check_release != 0 && cmd->se_tfo->check_release_cmd)
3366 if (cmd->se_tfo->check_release_cmd(cmd) != 0)
3367 return;
3368
3369 cmd->se_tfo->release_cmd(cmd);
3370}
3371
d3df7825
CH		 3372/**
3373 * transport_put_cmd - release a reference to a command
3374 * @cmd: command to release
3375 *
3376 * This routine releases our reference to the command and frees it if possible.
3377 */
39c05f32 3378static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3379{
3380 unsigned long flags;
4911e3cc 3381 int free_tasks = 0;
c66ac9db 3382
a1d8b49a 3383 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3384 if (atomic_read(&cmd->t_fe_count)) {
3385 if (!atomic_dec_and_test(&cmd->t_fe_count))
3386 goto out_busy;
3387 }
3388
3389 if (atomic_read(&cmd->t_se_count)) {
3390 if (!atomic_dec_and_test(&cmd->t_se_count))
3391 goto out_busy;
3392 }
3393
3394 if (atomic_read(&cmd->transport_dev_active)) {
3395 atomic_set(&cmd->transport_dev_active, 0);
3396 transport_all_task_dev_remove_state(cmd);
3397 free_tasks = 1;
c66ac9db 3398 }
a1d8b49a 3399 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3400
4911e3cc
CH		 3401 if (free_tasks != 0)
3402 transport_free_dev_tasks(cmd);
d3df7825 3403
c66ac9db 3404 transport_free_pages(cmd);
31afc39c 3405 transport_release_cmd(cmd);
39c05f32 3406 return;
4911e3cc
CH		 3407out_busy:
3408 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3409}
3410
c66ac9db 3411/*
ec98f782
AG		 3412 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3413 * allocating in the core.
c66ac9db
NB		 3414 * @cmd: Associated se_cmd descriptor
3415 * @mem: SGL style memory for TCM WRITE / READ
3416 * @sg_mem_num: Number of SGL elements
3417 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3418 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3419 *
3420 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3421 * of parameters.
3422 */
3423int transport_generic_map_mem_to_cmd(
3424 struct se_cmd *cmd,
5951146d
AG		 3425 struct scatterlist *sgl,
3426 u32 sgl_count,
3427 struct scatterlist *sgl_bidi,
3428 u32 sgl_bidi_count)
c66ac9db 3429{
5951146d 3430 if (!sgl || !sgl_count)
c66ac9db 3431 return 0;
c66ac9db 3432
c66ac9db
NB		 3433 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3434 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
fef58a60
NB		 3435 /*
3436 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3437 * scatterlists already have been set to follow what the fabric
3438 * passes for the original expected data transfer length.
3439 */
3440 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3441 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3442 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3443 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3444 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3445 return -EINVAL;
3446 }
c66ac9db 3447
ec98f782
AG		 3448 cmd->t_data_sg = sgl;
3449 cmd->t_data_nents = sgl_count;
c66ac9db 3450
ec98f782
AG		 3451 if (sgl_bidi && sgl_bidi_count) {
3452 cmd->t_bidi_data_sg = sgl_bidi;
3453 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3454 }
3455 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3456 }
3457
3458 return 0;
3459}
3460EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3461
05d1c7c0
AG		 3462void *transport_kmap_first_data_page(struct se_cmd *cmd)
3463{
ec98f782 3464 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3465
ec98f782 3466 BUG_ON(!sg);
05d1c7c0 3467 /*
ec98f782
AG		 3468 * We need to take into account a possible offset here for fabrics like
3469 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3470 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3471 */
ec98f782 3472 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3473}
3474EXPORT_SYMBOL(transport_kmap_first_data_page);
3475
3476void transport_kunmap_first_data_page(struct se_cmd *cmd)
3477{
ec98f782 3478 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3479}
3480EXPORT_SYMBOL(transport_kunmap_first_data_page);
3481
c66ac9db 3482static int
05d1c7c0 3483transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3484{
ec98f782
AG		 3485 u32 length = cmd->data_length;
3486 unsigned int nents;
3487 struct page *page;
3488 int i = 0;
c66ac9db 3489
ec98f782
AG		 3490 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3491 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3492 if (!cmd->t_data_sg)
3493 return -ENOMEM;
c66ac9db 3494
ec98f782
AG		 3495 cmd->t_data_nents = nents;
3496 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3497
ec98f782
AG		 3498 while (length) {
3499 u32 page_len = min_t(u32, length, PAGE_SIZE);
3500 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3501 if (!page)
3502 goto out;
c66ac9db 3503
ec98f782
AG		 3504 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3505 length -= page_len;
3506 i++;
c66ac9db 3507 }
c66ac9db 3508 return 0;
c66ac9db 3509
ec98f782
AG		 3510out:
3511 while (i >= 0) {
3512 __free_page(sg_page(&cmd->t_data_sg[i]));
3513 i--;
c66ac9db 3514 }
ec98f782
AG		 3515 kfree(cmd->t_data_sg);
3516 cmd->t_data_sg = NULL;
3517 return -ENOMEM;
c66ac9db
NB		 3518}
3519
a1d8b49a
AG		 3520/* Reduce sectors if they are too long for the device */
3521static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3522 struct se_device *dev,
3523 unsigned long long lba,
a1d8b49a 3524 sector_t sectors)
c66ac9db 3525{
a1d8b49a 3526 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3527
a1d8b49a
AG		 3528 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3529 if ((lba + sectors) > transport_dev_end_lba(dev))
3530 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3531
a1d8b49a 3532 return sectors;
c66ac9db
NB		 3533}
3534
c66ac9db
NB		 3535
3536/*
3537 * This function can be used by HW target mode drivers to create a linked
3538 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3539 * This is intended to be called during the completion path by TCM Core
3540 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3541 */
3542void transport_do_task_sg_chain(struct se_cmd *cmd)
3543{
ec98f782
AG		 3544 struct scatterlist *sg_first = NULL;
3545 struct scatterlist *sg_prev = NULL;
3546 int sg_prev_nents = 0;
3547 struct scatterlist *sg;
c66ac9db 3548 struct se_task *task;
ec98f782 3549 u32 chained_nents = 0;
c66ac9db
NB		 3550 int i;
3551
ec98f782
AG		 3552 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3553
c66ac9db
NB		 3554 /*
3555 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3556 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3557 */
a1d8b49a 3558 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3559 if (!task->task_sg)
c66ac9db
NB		 3560 continue;
3561
ec98f782
AG		 3562 if (!sg_first) {
3563 sg_first = task->task_sg;
6708bb27 3564 chained_nents = task->task_sg_nents;
97868c89 3565 } else {
ec98f782 3566 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3567 chained_nents += task->task_sg_nents;
97868c89 3568 }
c3c74c7a
NB		 3569 /*
3570 * For the padded tasks, use the extra SGL vector allocated
3571 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3572 * offset into sg_chain() above.
3573 *
3574 * We do not need the padding for the last task (or a single
3575 * task), but in that case we will never use the sg_prev_nents
3576 * value below which would be incorrect.
c3c74c7a 3577 */
04629b7b 3578 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3579 sg_prev = task->task_sg;
c66ac9db
NB		 3580 }
3581 /*
3582 * Setup the starting pointer and total t_tasks_sg_linked_no including
3583 * padding SGs for linking and to mark the end.
3584 */
a1d8b49a 3585 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3586 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3587
6708bb27 3588 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3589 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3590 cmd->t_tasks_sg_chained_no);
c66ac9db 3591
a1d8b49a
AG		 3592 for_each_sg(cmd->t_tasks_sg_chained, sg,
3593 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3594
6708bb27 3595 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3596 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3597 if (sg_is_chain(sg))
6708bb27 3598 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3599 if (sg_is_last(sg))
6708bb27 3600 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3601 }
c66ac9db
NB		 3602}
3603EXPORT_SYMBOL(transport_do_task_sg_chain);
3604
a1d8b49a
AG		 3605/*
3606 * Break up cmd into chunks transport can handle
3607 */
38b40067
CH		 3608static int
3609transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3610 enum dma_data_direction data_direction,
38b40067 3611 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3612{
5951146d 3613 struct se_device *dev = cmd->se_dev;
a3eedc22 3614 int task_count, i;
38b40067
CH		 3615 unsigned long long lba;
3616 sector_t sectors, dev_max_sectors;
3617 u32 sector_size;
3618
3619 if (transport_cmd_get_valid_sectors(cmd) < 0)
3620 return -EINVAL;
3621
3622 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3623 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
a1d8b49a 3624
ec98f782 3625 WARN_ON(cmd->data_length % sector_size);
38b40067
CH		 3626
3627 lba = cmd->t_task_lba;
ec98f782 3628 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27 3629 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
af3f00c7
CH		 3630
3631 /*
3632 * If we need just a single task reuse the SG list in the command
3633 * and avoid a lot of work.
3634 */
3635 if (task_count == 1) {
3636 struct se_task *task;
3637 unsigned long flags;
3638
3639 task = transport_generic_get_task(cmd, data_direction);
3640 if (!task)
3641 return -ENOMEM;
3642
3643 task->task_sg = cmd_sg;
3644 task->task_sg_nents = sgl_nents;
3645
3646 task->task_lba = lba;
3647 task->task_sectors = sectors;
3648 task->task_size = task->task_sectors * sector_size;
3649
3650 spin_lock_irqsave(&cmd->t_state_lock, flags);
3651 list_add_tail(&task->t_list, &cmd->t_task_list);
3652 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3653
3654 return task_count;
3655 }
3656
ec98f782 3657 for (i = 0; i < task_count; i++) {
38b40067 3658 struct se_task *task;
c3c74c7a 3659 unsigned int task_size, task_sg_nents_padded;
38b40067
CH		 3660 struct scatterlist *sg;
3661 unsigned long flags;
ec98f782 3662 int count;
a1d8b49a 3663
c66ac9db 3664 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3665 if (!task)
ec98f782 3666 return -ENOMEM;
c66ac9db 3667
c66ac9db 3668 task->task_lba = lba;
ec98f782
AG		 3669 task->task_sectors = min(sectors, dev_max_sectors);
3670 task->task_size = task->task_sectors * sector_size;
c66ac9db 3671
525a48a2
NB		 3672 /*
3673 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3674 * in order to calculate the number per task SGL entries
3675 */
3676 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3677 /*
ec98f782
AG		 3678 * Check if the fabric module driver is requesting that all
3679 * struct se_task->task_sg[] be chained together.. If so,
3680 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3681 * marking the end of the chained SGL for every task except
3682 * the last one for (task_count > 1) operation, or skipping
3683 * the extra padding for the (task_count == 1) case.
c66ac9db 3684 */
c3c74c7a
NB		 3685 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3686 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3687 } else
3688 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3689
1d20bb61 3690 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3691 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3692 if (!task->task_sg) {
3693 cmd->se_dev->transport->free_task(task);
3694 return -ENOMEM;
3695 }
3696
c3c74c7a 3697 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3698
ec98f782
AG		 3699 task_size = task->task_size;
3700
3701 /* Build new sgl, only up to task_size */
6708bb27 3702 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3703 if (cmd_sg->length > task_size)
3704 break;
3705
3706 *sg = *cmd_sg;
3707 task_size -= cmd_sg->length;
3708 cmd_sg = sg_next(cmd_sg);
c66ac9db 3709 }
c66ac9db 3710
ec98f782
AG		 3711 lba += task->task_sectors;
3712 sectors -= task->task_sectors;
c66ac9db 3713
ec98f782
AG		 3714 spin_lock_irqsave(&cmd->t_state_lock, flags);
3715 list_add_tail(&task->t_list, &cmd->t_task_list);
3716 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3717 }
3718
ec98f782 3719 return task_count;
c66ac9db
NB		 3720}
3721
3722static int
ec98f782 3723transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3724{
c66ac9db 3725 struct se_task *task;
ec98f782 3726 unsigned long flags;
c66ac9db
NB		 3727
3728 task = transport_generic_get_task(cmd, cmd->data_direction);
3729 if (!task)
ec98f782 3730 return -ENOMEM;
c66ac9db 3731
af3f00c7 3732 task->task_sg = cmd->t_data_sg;
c66ac9db 3733 task->task_size = cmd->data_length;
6708bb27 3734 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3735
ec98f782
AG		 3736 spin_lock_irqsave(&cmd->t_state_lock, flags);
3737 list_add_tail(&task->t_list, &cmd->t_task_list);
3738 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3739
6708bb27 3740 /* Success! Return number of tasks allocated */
a3eedc22 3741 return 1;
ec98f782
AG		 3742}
3743
da0f7619
CH		 3744/*
3745 * Allocate any required ressources to execute the command, and either place
3746 * it on the execution queue if possible. For writes we might not have the
3747 * payload yet, thus notify the fabric via a call to ->write_pending instead.
c66ac9db 3748 */
a1d8b49a 3749int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3750{
da0f7619 3751 struct se_device *dev = cmd->se_dev;
9ac54987 3752 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3753 int set_counts = 1;
c66ac9db
NB		 3754 int ret = 0;
3755
3756 /*
3757 * Determine is the TCM fabric module has already allocated physical
3758 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3759 * beforehand.
c66ac9db 3760 */
ec98f782
AG		 3761 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3762 cmd->data_length) {
05d1c7c0 3763 ret = transport_generic_get_mem(cmd);
c66ac9db 3764 if (ret < 0)
03e98c9e 3765 goto out_fail;
c66ac9db 3766 }
da0f7619 3767
1d20bb61 3768 /*
38b40067 3769 * For BIDI command set up the read tasks first.
1d20bb61 3770 */
da0f7619 3771 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3772 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3773 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3774
9ac54987
NB		 3775 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3776 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3777 cmd->t_bidi_data_nents);
3778 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3779 goto out_fail;
3780
3781 atomic_inc(&cmd->t_fe_count);
3782 atomic_inc(&cmd->t_se_count);
3783 set_counts = 0;
3784 }
38b40067
CH		 3785
3786 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3787 task_cdbs = transport_allocate_data_tasks(cmd,
3788 cmd->data_direction, cmd->t_data_sg,
3789 cmd->t_data_nents);
3790 } else {
3791 task_cdbs = transport_allocate_control_task(cmd);
3792 }
3793
410f6702 3794 if (task_cdbs < 0)
da0f7619 3795 goto out_fail;
410f6702
RD		 3796 else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3797 cmd->t_state = TRANSPORT_COMPLETE;
3798 atomic_set(&cmd->t_transport_active, 1);
3799 INIT_WORK(&cmd->work, target_complete_ok_work);
3800 queue_work(target_completion_wq, &cmd->work);
3801 return 0;
3802 }
da0f7619
CH		 3803
3804 if (set_counts) {
3805 atomic_inc(&cmd->t_fe_count);
3806 atomic_inc(&cmd->t_se_count);
3807 }
3808
9ac54987
NB		 3809 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3810 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3811 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3812
c66ac9db 3813 /*
a1d8b49a 3814 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3815 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3816 * will be added to the struct se_device execution queue after its WRITE
3817 * data has arrived. (ie: It gets handled by the transport processing
3818 * thread a second time)
3819 */
3820 if (cmd->data_direction == DMA_TO_DEVICE) {
3821 transport_add_tasks_to_state_queue(cmd);
3822 return transport_generic_write_pending(cmd);
3823 }
3824 /*
3825 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3826 * to the execution queue.
3827 */
3828 transport_execute_tasks(cmd);
3829 return 0;
da0f7619
CH		 3830
3831out_fail:
3832 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3833 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3834 return -EINVAL;
c66ac9db 3835}
a1d8b49a 3836EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3837
3838/* transport_generic_process_write():
3839 *
3840 *
3841 */
3842void transport_generic_process_write(struct se_cmd *cmd)
3843{
c66ac9db
NB		 3844 transport_execute_tasks(cmd);
3845}
3846EXPORT_SYMBOL(transport_generic_process_write);
3847
e057f533 3848static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3849{
f147abb4
NB		 3850 int ret;
3851
3852 ret = cmd->se_tfo->write_pending(cmd);
3853 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3854 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3855 cmd);
3856 transport_handle_queue_full(cmd, cmd->se_dev);
3857 }
07bde79a
NB		 3858}
3859
c66ac9db
NB		 3860static int transport_generic_write_pending(struct se_cmd *cmd)
3861{
3862 unsigned long flags;
3863 int ret;
3864
a1d8b49a 3865 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3866 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3867 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3868
c66ac9db
NB		 3869 /*
3870 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 3871 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 3872 * can be called from HW target mode interrupt code. This is safe
e3d6f909 3873 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3874 * because the se_cmd->se_lun pointer is not being cleared.
3875 */
3876 transport_cmd_check_stop(cmd, 1, 0);
3877
3878 /*
3879 * Call the fabric write_pending function here to let the
3880 * frontend know that WRITE buffers are ready.
3881 */
e3d6f909 3882 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3883 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3884 goto queue_full;
3885 else if (ret < 0)
c66ac9db
NB		 3886 return ret;
3887
03e98c9e 3888 return 1;
07bde79a
NB		 3889
3890queue_full:
6708bb27 3891 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3892 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3893 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3894 return 0;
c66ac9db
NB		 3895}
3896
39c05f32 3897void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3898{
d14921d6
NB		 3899 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3900 if (wait_for_tasks && cmd->se_tmr_req)
3901 transport_wait_for_tasks(cmd);
3902
35462975 3903 transport_release_cmd(cmd);
d14921d6
NB		 3904 } else {
3905 if (wait_for_tasks)
3906 transport_wait_for_tasks(cmd);
3907
c66ac9db
NB		 3908 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3909
82f1c8a4 3910 if (cmd->se_lun)
c66ac9db 3911 transport_lun_remove_cmd(cmd);
c66ac9db 3912
f4366772
NB		 3913 transport_free_dev_tasks(cmd);
3914
39c05f32 3915 transport_put_cmd(cmd);
c66ac9db
NB		 3916 }
3917}
3918EXPORT_SYMBOL(transport_generic_free_cmd);
3919
a17f091d
NB		 3920/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3921 * @se_sess: session to reference
3922 * @se_cmd: command descriptor to add
3923 */
3924void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3925{
3926 unsigned long flags;
3927
3928 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3929 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3930 se_cmd->check_release = 1;
3931 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3932}
3933EXPORT_SYMBOL(target_get_sess_cmd);
3934
3935/* target_put_sess_cmd - Check for active I/O shutdown or list delete
3936 * @se_sess: session to reference
3937 * @se_cmd: command descriptor to drop
3938 */
3939int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3940{
3941 unsigned long flags;
3942
3943 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3944 if (list_empty(&se_cmd->se_cmd_list)) {
3945 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3946 WARN_ON(1);
3947 return 0;
3948 }
3949
3950 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3951 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3952 complete(&se_cmd->cmd_wait_comp);
3953 return 1;
3954 }
3955 list_del(&se_cmd->se_cmd_list);
3956 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3957
3958 return 0;
3959}
3960EXPORT_SYMBOL(target_put_sess_cmd);
3961
3962/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3963 * @se_sess: session to split
3964 */
3965void target_splice_sess_cmd_list(struct se_session *se_sess)
3966{
3967 struct se_cmd *se_cmd;
3968 unsigned long flags;
3969
3970 WARN_ON(!list_empty(&se_sess->sess_wait_list));
3971 INIT_LIST_HEAD(&se_sess->sess_wait_list);
3972
3973 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3974 se_sess->sess_tearing_down = 1;
3975
3976 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3977
3978 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3979 se_cmd->cmd_wait_set = 1;
3980
3981 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3982}
3983EXPORT_SYMBOL(target_splice_sess_cmd_list);
3984
3985/* target_wait_for_sess_cmds - Wait for outstanding descriptors
3986 * @se_sess: session to wait for active I/O
3987 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3988 */
3989void target_wait_for_sess_cmds(
3990 struct se_session *se_sess,
3991 int wait_for_tasks)
3992{
3993 struct se_cmd *se_cmd, *tmp_cmd;
3994 bool rc = false;
3995
3996 list_for_each_entry_safe(se_cmd, tmp_cmd,
3997 &se_sess->sess_wait_list, se_cmd_list) {
3998 list_del(&se_cmd->se_cmd_list);
3999
4000 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4001 " %d\n", se_cmd, se_cmd->t_state,
4002 se_cmd->se_tfo->get_cmd_state(se_cmd));
4003
4004 if (wait_for_tasks) {
4005 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4006 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4007 se_cmd->se_tfo->get_cmd_state(se_cmd));
4008
4009 rc = transport_wait_for_tasks(se_cmd);
4010
4011 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4012 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4013 se_cmd->se_tfo->get_cmd_state(se_cmd));
4014 }
4015
4016 if (!rc) {
4017 wait_for_completion(&se_cmd->cmd_wait_comp);
4018 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4019 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4020 se_cmd->se_tfo->get_cmd_state(se_cmd));
4021 }
4022
4023 se_cmd->se_tfo->release_cmd(se_cmd);
4024 }
4025}
4026EXPORT_SYMBOL(target_wait_for_sess_cmds);
4027
c66ac9db
NB		 4028/* transport_lun_wait_for_tasks():
4029 *
4030 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4031 * an struct se_lun to be successfully shutdown.
4032 */
4033static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4034{
4035 unsigned long flags;
4036 int ret;
4037 /*
4038 * If the frontend has already requested this struct se_cmd to
4039 * be stopped, we can safely ignore this struct se_cmd.
4040 */
a1d8b49a
AG		 4041 spin_lock_irqsave(&cmd->t_state_lock, flags);
4042 if (atomic_read(&cmd->t_transport_stop)) {
4043 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4044 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4045 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4046 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4047 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4048 return -EPERM;
c66ac9db 4049 }
a1d8b49a
AG		 4050 atomic_set(&cmd->transport_lun_fe_stop, 1);
4051 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4052
5951146d 4053 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4054
4055 ret = transport_stop_tasks_for_cmd(cmd);
4056
6708bb27
AG		 4057 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4058 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4059 if (!ret) {
6708bb27 4060 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4061 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4062 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4063 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4064 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4065 }
3df8d40b 4066 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4067
4068 return 0;
4069}
4070
c66ac9db
NB		 4071static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4072{
4073 struct se_cmd *cmd = NULL;
4074 unsigned long lun_flags, cmd_flags;
4075 /*
4076 * Do exception processing and return CHECK_CONDITION status to the
4077 * Initiator Port.
4078 */
4079 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4080 while (!list_empty(&lun->lun_cmd_list)) {
4081 cmd = list_first_entry(&lun->lun_cmd_list,
4082 struct se_cmd, se_lun_node);
4083 list_del(&cmd->se_lun_node);
4084
a1d8b49a 4085 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4086 /*
4087 * This will notify iscsi_target_transport.c:
4088 * transport_cmd_check_stop() that a LUN shutdown is in
4089 * progress for the iscsi_cmd_t.
4090 */
a1d8b49a 4091 spin_lock(&cmd->t_state_lock);
6708bb27 4092 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4093 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4094 cmd->se_lun->unpacked_lun,
4095 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4096 atomic_set(&cmd->transport_lun_stop, 1);
4097 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4098
4099 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4100
6708bb27
AG		 4101 if (!cmd->se_lun) {
4102 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4103 cmd->se_tfo->get_task_tag(cmd),
4104 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4105 BUG();
4106 }
4107 /*
4108 * If the Storage engine still owns the iscsi_cmd_t, determine
4109 * and/or stop its context.
4110 */
6708bb27 4111 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4112 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4113 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4114
e3d6f909 4115 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4116 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4117 continue;
4118 }
4119
6708bb27 4120 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4121 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4122 cmd->se_lun->unpacked_lun,
4123 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4124
a1d8b49a 4125 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4126 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4127 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4128 goto check_cond;
4129 }
a1d8b49a 4130 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4131 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4132 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4133
4134 transport_free_dev_tasks(cmd);
4135 /*
4136 * The Storage engine stopped this struct se_cmd before it was
4137 * send to the fabric frontend for delivery back to the
4138 * Initiator Node. Return this SCSI CDB back with an
4139 * CHECK_CONDITION status.
4140 */
4141check_cond:
4142 transport_send_check_condition_and_sense(cmd,
4143 TCM_NON_EXISTENT_LUN, 0);
4144 /*
4145 * If the fabric frontend is waiting for this iscsi_cmd_t to
4146 * be released, notify the waiting thread now that LU has
4147 * finished accessing it.
4148 */
a1d8b49a
AG		 4149 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4150 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4151 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4152 " struct se_cmd: %p ITT: 0x%08x\n",
4153 lun->unpacked_lun,
e3d6f909 4154 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4155
a1d8b49a 4156 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4157 cmd_flags);
4158 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4159 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4160 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4161 continue;
4162 }
6708bb27 4163 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4164 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4165
a1d8b49a 4166 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4167 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4168 }
4169 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4170}
4171
4172static int transport_clear_lun_thread(void *p)
4173{
4174 struct se_lun *lun = (struct se_lun *)p;
4175
4176 __transport_clear_lun_from_sessions(lun);
4177 complete(&lun->lun_shutdown_comp);
4178
4179 return 0;
4180}
4181
4182int transport_clear_lun_from_sessions(struct se_lun *lun)
4183{
4184 struct task_struct *kt;
4185
5951146d 4186 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4187 "tcm_cl_%u", lun->unpacked_lun);
4188 if (IS_ERR(kt)) {
6708bb27 4189 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4190 return PTR_ERR(kt);
c66ac9db
NB		 4191 }
4192 wait_for_completion(&lun->lun_shutdown_comp);
4193
4194 return 0;
4195}
4196
d14921d6
NB		 4197/**
4198 * transport_wait_for_tasks - wait for completion to occur
4199 * @cmd: command to wait
c66ac9db 4200 *
d14921d6
NB		 4201 * Called from frontend fabric context to wait for storage engine
4202 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4203 */
a17f091d 4204bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4205{
4206 unsigned long flags;
4207
a1d8b49a 4208 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4209 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4210 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4211 return false;
d14921d6
NB		 4212 }
4213 /*
4214 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4215 * has been set in transport_set_supported_SAM_opcode().
4216 */
4217 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4218 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4219 return false;
d14921d6 4220 }
c66ac9db
NB		 4221 /*
4222 * If we are already stopped due to an external event (ie: LUN shutdown)
4223 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4224 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4225 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4226 * has completed its operation on the struct se_cmd.
4227 */
a1d8b49a 4228 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4229
6708bb27 4230 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4231 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4232 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4233 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4234 /*
4235 * There is a special case for WRITES where a FE exception +
4236 * LUN shutdown means ConfigFS context is still sleeping on
4237 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4238 * We go ahead and up transport_lun_stop_comp just to be sure
4239 * here.
4240 */
a1d8b49a
AG		 4241 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4242 complete(&cmd->transport_lun_stop_comp);
4243 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4244 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4245
4246 transport_all_task_dev_remove_state(cmd);
4247 /*
4248 * At this point, the frontend who was the originator of this
4249 * struct se_cmd, now owns the structure and can be released through
4250 * normal means below.
4251 */
6708bb27 4252 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4253 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4254 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4255 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4256
a1d8b49a 4257 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4258 }
a1d8b49a 4259 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4260 atomic_read(&cmd->t_transport_aborted)) {
4261 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4262 return false;
d14921d6 4263 }
c66ac9db 4264
a1d8b49a 4265 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4266
6708bb27 4267 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
f2da9dbd
CH		 4268 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4269 cmd, cmd->se_tfo->get_task_tag(cmd),
4270 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4271
a1d8b49a 4272 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4273
5951146d 4274 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4275
a1d8b49a 4276 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4277
a1d8b49a
AG		 4278 spin_lock_irqsave(&cmd->t_state_lock, flags);
4279 atomic_set(&cmd->t_transport_active, 0);
4280 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4281
6708bb27 4282 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4283 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4284 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4285
d14921d6 4286 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4287
4288 return true;
c66ac9db 4289}
d14921d6 4290EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4291
4292static int transport_get_sense_codes(
4293 struct se_cmd *cmd,
4294 u8 *asc,
4295 u8 *ascq)
4296{
4297 *asc = cmd->scsi_asc;
4298 *ascq = cmd->scsi_ascq;
4299
4300 return 0;
4301}
4302
4303static int transport_set_sense_codes(
4304 struct se_cmd *cmd,
4305 u8 asc,
4306 u8 ascq)
4307{
4308 cmd->scsi_asc = asc;
4309 cmd->scsi_ascq = ascq;
4310
4311 return 0;
4312}
4313
4314int transport_send_check_condition_and_sense(
4315 struct se_cmd *cmd,
4316 u8 reason,
4317 int from_transport)
4318{
4319 unsigned char *buffer = cmd->sense_buffer;
4320 unsigned long flags;
4321 int offset;
4322 u8 asc = 0, ascq = 0;
4323
a1d8b49a 4324 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4325 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4326 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4327 return 0;
4328 }
4329 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4330 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4331
4332 if (!reason && from_transport)
4333 goto after_reason;
4334
4335 if (!from_transport)
4336 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4337 /*
4338 * Data Segment and SenseLength of the fabric response PDU.
4339 *
4340 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4341 * from include/scsi/scsi_cmnd.h
4342 */
e3d6f909 4343 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4344 TRANSPORT_SENSE_BUFFER);
4345 /*
4346 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4347 * SENSE KEY values from include/scsi/scsi.h
4348 */
4349 switch (reason) {
4350 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4351 /* CURRENT ERROR */
4352 buffer[offset] = 0x70;
4353 /* ILLEGAL REQUEST */
4354 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4355 /* LOGICAL UNIT NOT SUPPORTED */
4356 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4357 break;
c66ac9db
NB		 4358 case TCM_UNSUPPORTED_SCSI_OPCODE:
4359 case TCM_SECTOR_COUNT_TOO_MANY:
4360 /* CURRENT ERROR */
4361 buffer[offset] = 0x70;
4362 /* ILLEGAL REQUEST */
4363 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4364 /* INVALID COMMAND OPERATION CODE */
4365 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4366 break;
4367 case TCM_UNKNOWN_MODE_PAGE:
4368 /* CURRENT ERROR */
4369 buffer[offset] = 0x70;
4370 /* ILLEGAL REQUEST */
4371 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4372 /* INVALID FIELD IN CDB */
4373 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4374 break;
4375 case TCM_CHECK_CONDITION_ABORT_CMD:
4376 /* CURRENT ERROR */
4377 buffer[offset] = 0x70;
4378 /* ABORTED COMMAND */
4379 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4380 /* BUS DEVICE RESET FUNCTION OCCURRED */
4381 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4382 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4383 break;
4384 case TCM_INCORRECT_AMOUNT_OF_DATA:
4385 /* CURRENT ERROR */
4386 buffer[offset] = 0x70;
4387 /* ABORTED COMMAND */
4388 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4389 /* WRITE ERROR */
4390 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4391 /* NOT ENOUGH UNSOLICITED DATA */
4392 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4393 break;
4394 case TCM_INVALID_CDB_FIELD:
4395 /* CURRENT ERROR */
4396 buffer[offset] = 0x70;
4397 /* ABORTED COMMAND */
4398 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4399 /* INVALID FIELD IN CDB */
4400 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4401 break;
4402 case TCM_INVALID_PARAMETER_LIST:
4403 /* CURRENT ERROR */
4404 buffer[offset] = 0x70;
4405 /* ABORTED COMMAND */
4406 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4407 /* INVALID FIELD IN PARAMETER LIST */
4408 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4409 break;
4410 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4411 /* CURRENT ERROR */
4412 buffer[offset] = 0x70;
4413 /* ABORTED COMMAND */
4414 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4415 /* WRITE ERROR */
4416 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4417 /* UNEXPECTED_UNSOLICITED_DATA */
4418 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4419 break;
4420 case TCM_SERVICE_CRC_ERROR:
4421 /* CURRENT ERROR */
4422 buffer[offset] = 0x70;
4423 /* ABORTED COMMAND */
4424 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4425 /* PROTOCOL SERVICE CRC ERROR */
4426 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4427 /* N/A */
4428 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4429 break;
4430 case TCM_SNACK_REJECTED:
4431 /* CURRENT ERROR */
4432 buffer[offset] = 0x70;
4433 /* ABORTED COMMAND */
4434 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4435 /* READ ERROR */
4436 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4437 /* FAILED RETRANSMISSION REQUEST */
4438 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4439 break;
4440 case TCM_WRITE_PROTECTED:
4441 /* CURRENT ERROR */
4442 buffer[offset] = 0x70;
4443 /* DATA PROTECT */
4444 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4445 /* WRITE PROTECTED */
4446 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4447 break;
4448 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4449 /* CURRENT ERROR */
4450 buffer[offset] = 0x70;
4451 /* UNIT ATTENTION */
4452 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4453 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4454 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4455 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4456 break;
4457 case TCM_CHECK_CONDITION_NOT_READY:
4458 /* CURRENT ERROR */
4459 buffer[offset] = 0x70;
4460 /* Not Ready */
4461 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4462 transport_get_sense_codes(cmd, &asc, &ascq);
4463 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4464 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4465 break;
4466 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4467 default:
4468 /* CURRENT ERROR */
4469 buffer[offset] = 0x70;
4470 /* ILLEGAL REQUEST */
4471 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4472 /* LOGICAL UNIT COMMUNICATION FAILURE */
4473 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4474 break;
4475 }
4476 /*
4477 * This code uses linux/include/scsi/scsi.h SAM status codes!
4478 */
4479 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4480 /*
4481 * Automatically padded, this value is encoded in the fabric's
4482 * data_length response PDU containing the SCSI defined sense data.
4483 */
4484 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4485
4486after_reason:
07bde79a 4487 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4488}
4489EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4490
4491int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4492{
4493 int ret = 0;
4494
a1d8b49a 4495 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4496 if (!send_status ||
c66ac9db
NB		 4497 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4498 return 1;
4499#if 0
6708bb27 4500 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4501 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4502 cmd->t_task_cdb[0],
e3d6f909 4503 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4504#endif
4505 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4506 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4507 ret = 1;
4508 }
4509 return ret;
4510}
4511EXPORT_SYMBOL(transport_check_aborted_status);
4512
4513void transport_send_task_abort(struct se_cmd *cmd)
4514{
c252f003
NB		 4515 unsigned long flags;
4516
4517 spin_lock_irqsave(&cmd->t_state_lock, flags);
4518 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4519 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4520 return;
4521 }
4522 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4523
c66ac9db
NB		 4524 /*
4525 * If there are still expected incoming fabric WRITEs, we wait
4526 * until until they have completed before sending a TASK_ABORTED
4527 * response. This response with TASK_ABORTED status will be
4528 * queued back to fabric module by transport_check_aborted_status().
4529 */
4530 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4531 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4532 atomic_inc(&cmd->t_transport_aborted);
c66ac9db 4533 smp_mb__after_atomic_inc();
c66ac9db
NB		 4534 }
4535 }
4536 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4537#if 0
6708bb27 4538 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4539 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4540 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4541#endif
e3d6f909 4542 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4543}
4544
e26d99ae 4545static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4546{
5951146d 4547 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4548 struct se_tmr_req *tmr = cmd->se_tmr_req;
4549 int ret;
4550
4551 switch (tmr->function) {
5c6cd613 4552 case TMR_ABORT_TASK:
c66ac9db
NB		 4553 tmr->response = TMR_FUNCTION_REJECTED;
4554 break;
5c6cd613
NB		 4555 case TMR_ABORT_TASK_SET:
4556 case TMR_CLEAR_ACA:
4557 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4558 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4559 break;
5c6cd613 4560 case TMR_LUN_RESET:
c66ac9db
NB		 4561 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4562 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4563 TMR_FUNCTION_REJECTED;
4564 break;
5c6cd613 4565 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4566 tmr->response = TMR_FUNCTION_REJECTED;
4567 break;
5c6cd613 4568 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4569 tmr->response = TMR_FUNCTION_REJECTED;
4570 break;
c66ac9db 4571 default:
6708bb27 4572 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4573 tmr->function);
4574 tmr->response = TMR_FUNCTION_REJECTED;
4575 break;
4576 }
4577
4578 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4579 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4580
b7b8bef7 4581 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4582 return 0;
4583}
4584
c66ac9db
NB		 4585/* transport_processing_thread():
4586 *
4587 *
4588 */
4589static int transport_processing_thread(void *param)
4590{
5951146d 4591 int ret;
c66ac9db
NB		 4592 struct se_cmd *cmd;
4593 struct se_device *dev = (struct se_device *) param;
c66ac9db 4594
c66ac9db 4595 while (!kthread_should_stop()) {
e3d6f909
AG		 4596 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4597 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4598 kthread_should_stop());
4599 if (ret < 0)
4600 goto out;
4601
c66ac9db
NB		 4602get_cmd:
4603 __transport_execute_tasks(dev);
4604
5951146d
AG		 4605 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4606 if (!cmd)
c66ac9db
NB		 4607 continue;
4608
5951146d 4609 switch (cmd->t_state) {
680b73c5
CH		 4610 case TRANSPORT_NEW_CMD:
4611 BUG();
4612 break;
c66ac9db 4613 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4614 if (!cmd->se_tfo->new_cmd_map) {
4615 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4616 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4617 BUG();
4618 }
e3d6f909 4619 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4620 if (ret < 0) {
03e98c9e 4621 transport_generic_request_failure(cmd);
c66ac9db
NB		 4622 break;
4623 }
c66ac9db 4624 ret = transport_generic_new_cmd(cmd);
f147abb4 4625 if (ret < 0) {
03e98c9e
NB		 4626 transport_generic_request_failure(cmd);
4627 break;
c66ac9db
NB		 4628 }
4629 break;
4630 case TRANSPORT_PROCESS_WRITE:
4631 transport_generic_process_write(cmd);
4632 break;
c66ac9db
NB		 4633 case TRANSPORT_PROCESS_TMR:
4634 transport_generic_do_tmr(cmd);
4635 break;
07bde79a 4636 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4637 transport_write_pending_qf(cmd);
4638 break;
4639 case TRANSPORT_COMPLETE_QF_OK:
4640 transport_complete_qf(cmd);
07bde79a 4641 break;
c66ac9db 4642 default:
f2da9dbd
CH		 4643 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4644 "i_state: %d on SE LUN: %u\n",
4645 cmd->t_state,
e3d6f909
AG		 4646 cmd->se_tfo->get_task_tag(cmd),
4647 cmd->se_tfo->get_cmd_state(cmd),
4648 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4649 BUG();
4650 }
4651
4652 goto get_cmd;
4653 }
4654
4655out:
ce8762f6
NB		 4656 WARN_ON(!list_empty(&dev->state_task_list));
4657 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4658 dev->process_thread = NULL;
4659 return 0;
4660}
Linux kernel - Deliverables
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