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target: lock => unlock typo in transport_lun_wait_for_tasks
[mirror_ubuntu-bionic-kernel.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>
015487b8 40#include <linux/ratelimit.h>
c66ac9db
NB		 41#include <asm/unaligned.h>
42#include <net/sock.h>
43#include <net/tcp.h>
44#include <scsi/scsi.h>
45#include <scsi/scsi_cmnd.h>
e66ecd50 46#include <scsi/scsi_tcq.h>
c66ac9db
NB		 47
48#include <target/target_core_base.h>
c4795fb2
CH		 49#include <target/target_core_backend.h>
50#include <target/target_core_fabric.h>
c66ac9db
NB		 51#include <target/target_core_configfs.h>
52
e26d99ae 53#include "target_core_internal.h"
c66ac9db 54#include "target_core_alua.h"
c66ac9db 55#include "target_core_pr.h"
c66ac9db
NB		 56#include "target_core_ua.h"
57
e3d6f909 58static int sub_api_initialized;
c66ac9db 59
35e0e757 60static struct workqueue_struct *target_completion_wq;
c66ac9db 61static struct kmem_cache *se_sess_cache;
c66ac9db 62struct kmem_cache *se_ua_cache;
c66ac9db
NB		 63struct kmem_cache *t10_pr_reg_cache;
64struct kmem_cache *t10_alua_lu_gp_cache;
65struct kmem_cache *t10_alua_lu_gp_mem_cache;
66struct kmem_cache *t10_alua_tg_pt_gp_cache;
67struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
68
c66ac9db 69static int transport_generic_write_pending(struct se_cmd *);
5951146d 70static int transport_processing_thread(void *param);
4d2300cc 71static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
c66ac9db 72static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 73static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 74 struct se_device *dev);
05d1c7c0 75static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 76static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 77static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 78static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
35e0e757 79static void target_complete_ok_work(struct work_struct *work);
c66ac9db 80
e3d6f909 81int init_se_kmem_caches(void)
c66ac9db 82{
c66ac9db
NB		 83 se_sess_cache = kmem_cache_create("se_sess_cache",
84 sizeof(struct se_session), __alignof__(struct se_session),
85 0, NULL);
6708bb27
AG		 86 if (!se_sess_cache) {
87 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 88 " failed\n");
c8e31f26 89 goto out;
c66ac9db
NB		 90 }
91 se_ua_cache = kmem_cache_create("se_ua_cache",
92 sizeof(struct se_ua), __alignof__(struct se_ua),
93 0, NULL);
6708bb27
AG		 94 if (!se_ua_cache) {
95 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 96 goto out_free_sess_cache;
c66ac9db 97 }
c66ac9db
NB		 98 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
99 sizeof(struct t10_pr_registration),
100 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 101 if (!t10_pr_reg_cache) {
102 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 103 " failed\n");
35e0e757 104 goto out_free_ua_cache;
c66ac9db
NB		 105 }
106 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
107 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
108 0, NULL);
6708bb27
AG		 109 if (!t10_alua_lu_gp_cache) {
110 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 111 " failed\n");
35e0e757 112 goto out_free_pr_reg_cache;
c66ac9db
NB		 113 }
114 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
115 sizeof(struct t10_alua_lu_gp_member),
116 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 117 if (!t10_alua_lu_gp_mem_cache) {
118 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 119 "cache failed\n");
35e0e757 120 goto out_free_lu_gp_cache;
c66ac9db
NB		 121 }
122 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
123 sizeof(struct t10_alua_tg_pt_gp),
124 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 125 if (!t10_alua_tg_pt_gp_cache) {
126 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 127 "cache failed\n");
35e0e757 128 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 129 }
130 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
131 "t10_alua_tg_pt_gp_mem_cache",
132 sizeof(struct t10_alua_tg_pt_gp_member),
133 __alignof__(struct t10_alua_tg_pt_gp_member),
134 0, NULL);
6708bb27
AG		 135 if (!t10_alua_tg_pt_gp_mem_cache) {
136 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 137 "mem_t failed\n");
35e0e757 138 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 139 }
140
35e0e757
CH		 141 target_completion_wq = alloc_workqueue("target_completion",
142 WQ_MEM_RECLAIM, 0);
143 if (!target_completion_wq)
144 goto out_free_tg_pt_gp_mem_cache;
145
c66ac9db 146 return 0;
35e0e757
CH		 147
148out_free_tg_pt_gp_mem_cache:
149 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
150out_free_tg_pt_gp_cache:
151 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
152out_free_lu_gp_mem_cache:
153 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
154out_free_lu_gp_cache:
155 kmem_cache_destroy(t10_alua_lu_gp_cache);
156out_free_pr_reg_cache:
157 kmem_cache_destroy(t10_pr_reg_cache);
158out_free_ua_cache:
159 kmem_cache_destroy(se_ua_cache);
160out_free_sess_cache:
161 kmem_cache_destroy(se_sess_cache);
c66ac9db 162out:
e3d6f909 163 return -ENOMEM;
c66ac9db
NB		 164}
165
e3d6f909 166void release_se_kmem_caches(void)
c66ac9db 167{
35e0e757 168 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 169 kmem_cache_destroy(se_sess_cache);
170 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 171 kmem_cache_destroy(t10_pr_reg_cache);
172 kmem_cache_destroy(t10_alua_lu_gp_cache);
173 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
174 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 176}
177
e3d6f909
AG		 178/* This code ensures unique mib indexes are handed out. */
179static DEFINE_SPINLOCK(scsi_mib_index_lock);
180static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 181
182/*
183 * Allocate a new row index for the entry type specified
184 */
185u32 scsi_get_new_index(scsi_index_t type)
186{
187 u32 new_index;
188
e3d6f909 189 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 190
e3d6f909
AG		 191 spin_lock(&scsi_mib_index_lock);
192 new_index = ++scsi_mib_index[type];
193 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 194
195 return new_index;
196}
197
e26d99ae 198static void transport_init_queue_obj(struct se_queue_obj *qobj)
c66ac9db
NB		 199{
200 atomic_set(&qobj->queue_cnt, 0);
201 INIT_LIST_HEAD(&qobj->qobj_list);
202 init_waitqueue_head(&qobj->thread_wq);
203 spin_lock_init(&qobj->cmd_queue_lock);
204}
c66ac9db 205
dbc5623e 206void transport_subsystem_check_init(void)
c66ac9db
NB		 207{
208 int ret;
209
dbc5623e
NB		 210 if (sub_api_initialized)
211 return;
212
c66ac9db
NB		 213 ret = request_module("target_core_iblock");
214 if (ret != 0)
6708bb27 215 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 216
217 ret = request_module("target_core_file");
218 if (ret != 0)
6708bb27 219 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 220
221 ret = request_module("target_core_pscsi");
222 if (ret != 0)
6708bb27 223 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 224
225 ret = request_module("target_core_stgt");
226 if (ret != 0)
6708bb27 227 pr_err("Unable to load target_core_stgt\n");
c66ac9db 228
e3d6f909 229 sub_api_initialized = 1;
dbc5623e 230 return;
c66ac9db
NB		 231}
232
233struct se_session *transport_init_session(void)
234{
235 struct se_session *se_sess;
236
237 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 238 if (!se_sess) {
239 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 240 " se_sess_cache\n");
241 return ERR_PTR(-ENOMEM);
242 }
243 INIT_LIST_HEAD(&se_sess->sess_list);
244 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d
NB		 245 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
246 INIT_LIST_HEAD(&se_sess->sess_wait_list);
247 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 248 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 249
250 return se_sess;
251}
252EXPORT_SYMBOL(transport_init_session);
253
254/*
140854cb 255 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 256 */
257void __transport_register_session(
258 struct se_portal_group *se_tpg,
259 struct se_node_acl *se_nacl,
260 struct se_session *se_sess,
261 void *fabric_sess_ptr)
262{
263 unsigned char buf[PR_REG_ISID_LEN];
264
265 se_sess->se_tpg = se_tpg;
266 se_sess->fabric_sess_ptr = fabric_sess_ptr;
267 /*
268 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
269 *
270 * Only set for struct se_session's that will actually be moving I/O.
271 * eg: *NOT* discovery sessions.
272 */
273 if (se_nacl) {
274 /*
275 * If the fabric module supports an ISID based TransportID,
276 * save this value in binary from the fabric I_T Nexus now.
277 */
e3d6f909 278 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 279 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 280 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 281 &buf[0], PR_REG_ISID_LEN);
282 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
283 }
afb999ff
NB		 284 kref_get(&se_nacl->acl_kref);
285
c66ac9db
NB		 286 spin_lock_irq(&se_nacl->nacl_sess_lock);
287 /*
288 * The se_nacl->nacl_sess pointer will be set to the
289 * last active I_T Nexus for each struct se_node_acl.
290 */
291 se_nacl->nacl_sess = se_sess;
292
293 list_add_tail(&se_sess->sess_acl_list,
294 &se_nacl->acl_sess_list);
295 spin_unlock_irq(&se_nacl->nacl_sess_lock);
296 }
297 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
298
6708bb27 299 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 300 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 301}
302EXPORT_SYMBOL(__transport_register_session);
303
304void transport_register_session(
305 struct se_portal_group *se_tpg,
306 struct se_node_acl *se_nacl,
307 struct se_session *se_sess,
308 void *fabric_sess_ptr)
309{
140854cb
NB		 310 unsigned long flags;
311
312 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 313 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 314 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 315}
316EXPORT_SYMBOL(transport_register_session);
317
41ac82b6
NB		 318static void target_release_session(struct kref *kref)
319{
320 struct se_session *se_sess = container_of(kref,
321 struct se_session, sess_kref);
322 struct se_portal_group *se_tpg = se_sess->se_tpg;
323
324 se_tpg->se_tpg_tfo->close_session(se_sess);
325}
326
327void target_get_session(struct se_session *se_sess)
328{
329 kref_get(&se_sess->sess_kref);
330}
331EXPORT_SYMBOL(target_get_session);
332
333int target_put_session(struct se_session *se_sess)
334{
335 return kref_put(&se_sess->sess_kref, target_release_session);
336}
337EXPORT_SYMBOL(target_put_session);
338
afb999ff
NB		 339static void target_complete_nacl(struct kref *kref)
340{
341 struct se_node_acl *nacl = container_of(kref,
342 struct se_node_acl, acl_kref);
343
344 complete(&nacl->acl_free_comp);
345}
346
347void target_put_nacl(struct se_node_acl *nacl)
348{
349 kref_put(&nacl->acl_kref, target_complete_nacl);
350}
351
c66ac9db
NB		 352void transport_deregister_session_configfs(struct se_session *se_sess)
353{
354 struct se_node_acl *se_nacl;
23388864 355 unsigned long flags;
c66ac9db
NB		 356 /*
357 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
358 */
359 se_nacl = se_sess->se_node_acl;
6708bb27 360 if (se_nacl) {
23388864 361 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 362 if (se_nacl->acl_stop == 0)
363 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 364 /*
365 * If the session list is empty, then clear the pointer.
366 * Otherwise, set the struct se_session pointer from the tail
367 * element of the per struct se_node_acl active session list.
368 */
369 if (list_empty(&se_nacl->acl_sess_list))
370 se_nacl->nacl_sess = NULL;
371 else {
372 se_nacl->nacl_sess = container_of(
373 se_nacl->acl_sess_list.prev,
374 struct se_session, sess_acl_list);
375 }
23388864 376 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 377 }
378}
379EXPORT_SYMBOL(transport_deregister_session_configfs);
380
381void transport_free_session(struct se_session *se_sess)
382{
383 kmem_cache_free(se_sess_cache, se_sess);
384}
385EXPORT_SYMBOL(transport_free_session);
386
387void transport_deregister_session(struct se_session *se_sess)
388{
389 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 390 struct target_core_fabric_ops *se_tfo;
c66ac9db 391 struct se_node_acl *se_nacl;
e63a8e19 392 unsigned long flags;
01468346 393 bool comp_nacl = true;
c66ac9db 394
6708bb27 395 if (!se_tpg) {
c66ac9db
NB		 396 transport_free_session(se_sess);
397 return;
398 }
01468346 399 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 400
e63a8e19 401 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 402 list_del(&se_sess->sess_list);
403 se_sess->se_tpg = NULL;
404 se_sess->fabric_sess_ptr = NULL;
e63a8e19 405 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 406
407 /*
408 * Determine if we need to do extra work for this initiator node's
409 * struct se_node_acl if it had been previously dynamically generated.
410 */
411 se_nacl = se_sess->se_node_acl;
01468346
NB		 412
413 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
414 if (se_nacl && se_nacl->dynamic_node_acl) {
415 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
416 list_del(&se_nacl->acl_list);
417 se_tpg->num_node_acls--;
418 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
419 core_tpg_wait_for_nacl_pr_ref(se_nacl);
420 core_free_device_list_for_node(se_nacl, se_tpg);
421 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
422
423 comp_nacl = false;
424 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 425 }
c66ac9db 426 }
01468346 427 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 428
6708bb27 429 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 430 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 431 /*
afb999ff
NB		 432 * If last kref is dropping now for an explict NodeACL, awake sleeping
433 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
434 * removal context.
01468346
NB		 435 */
436 if (se_nacl && comp_nacl == true)
afb999ff 437 target_put_nacl(se_nacl);
01468346 438
afb999ff 439 transport_free_session(se_sess);
c66ac9db
NB		 440}
441EXPORT_SYMBOL(transport_deregister_session);
442
443/*
a1d8b49a 444 * Called with cmd->t_state_lock held.
c66ac9db 445 */
cf572a96 446static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 447{
42bf829e 448 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 449 unsigned long flags;
450
42bf829e
CH		 451 if (!dev)
452 return;
c66ac9db 453
cf572a96
CH		 454 if (cmd->transport_state & CMD_T_BUSY)
455 return;
c66ac9db 456
cf572a96
CH		 457 spin_lock_irqsave(&dev->execute_task_lock, flags);
458 if (cmd->state_active) {
459 list_del(&cmd->state_list);
cf572a96 460 cmd->state_active = false;
c66ac9db 461 }
cf572a96 462 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 463}
464
465/* transport_cmd_check_stop():
466 *
7d680f3b 467 * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
c66ac9db
NB		 468 * 'transport_off = 2' determines if task_dev_state should be removed.
469 *
470 * A non-zero u8 t_state sets cmd->t_state.
471 * Returns 1 when command is stopped, else 0.
472 */
473static int transport_cmd_check_stop(
474 struct se_cmd *cmd,
475 int transport_off,
476 u8 t_state)
477{
478 unsigned long flags;
479
a1d8b49a 480 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 481 /*
482 * Determine if IOCTL context caller in requesting the stopping of this
483 * command for LUN shutdown purposes.
484 */
7d680f3b
CH		 485 if (cmd->transport_state & CMD_T_LUN_STOP) {
486 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
487 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 488
7d680f3b 489 cmd->transport_state &= ~CMD_T_ACTIVE;
c66ac9db 490 if (transport_off == 2)
cf572a96 491 target_remove_from_state_list(cmd);
a1d8b49a 492 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 493
a1d8b49a 494 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 495 return 1;
496 }
497 /*
498 * Determine if frontend context caller is requesting the stopping of
e3d6f909 499 * this command for frontend exceptions.
c66ac9db 500 */
7d680f3b
CH		 501 if (cmd->transport_state & CMD_T_STOP) {
502 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
503 __func__, __LINE__,
e3d6f909 504 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 505
c66ac9db 506 if (transport_off == 2)
cf572a96 507 target_remove_from_state_list(cmd);
c66ac9db
NB		 508
509 /*
510 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
511 * to FE.
512 */
513 if (transport_off == 2)
514 cmd->se_lun = NULL;
a1d8b49a 515 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 516
a1d8b49a 517 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 518 return 1;
519 }
520 if (transport_off) {
7d680f3b 521 cmd->transport_state &= ~CMD_T_ACTIVE;
c66ac9db 522 if (transport_off == 2) {
cf572a96 523 target_remove_from_state_list(cmd);
c66ac9db
NB		 524 /*
525 * Clear struct se_cmd->se_lun before the transport_off == 2
526 * handoff to fabric module.
527 */
528 cmd->se_lun = NULL;
529 /*
530 * Some fabric modules like tcm_loop can release
25985edc 531 * their internally allocated I/O reference now and
c66ac9db 532 * struct se_cmd now.
88dd9e26
NB		 533 *
534 * Fabric modules are expected to return '1' here if the
535 * se_cmd being passed is released at this point,
536 * or zero if not being released.
c66ac9db 537 */
e3d6f909 538 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 539 spin_unlock_irqrestore(
a1d8b49a 540 &cmd->t_state_lock, flags);
c66ac9db 541
88dd9e26 542 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 543 }
544 }
a1d8b49a 545 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 546
547 return 0;
548 } else if (t_state)
549 cmd->t_state = t_state;
a1d8b49a 550 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 551
552 return 0;
553}
554
555static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
556{
557 return transport_cmd_check_stop(cmd, 2, 0);
558}
559
560static void transport_lun_remove_cmd(struct se_cmd *cmd)
561{
e3d6f909 562 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 563 unsigned long flags;
564
565 if (!lun)
566 return;
567
a1d8b49a 568 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 569 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
570 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 571 target_remove_from_state_list(cmd);
c66ac9db 572 }
a1d8b49a 573 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 574
c66ac9db 575 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 576 if (!list_empty(&cmd->se_lun_node))
577 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 578 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
579}
580
581void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
582{
c8e31f26 583 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
8dc52b54 584 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 585
586 if (transport_cmd_check_stop_to_fabric(cmd))
587 return;
77039d1e 588 if (remove) {
3df8d40b 589 transport_remove_cmd_from_queue(cmd);
e6a2573f 590 transport_put_cmd(cmd);
77039d1e 591 }
c66ac9db
NB		 592}
593
f7a5cc0b
CH		 594static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
595 bool at_head)
c66ac9db
NB		 596{
597 struct se_device *dev = cmd->se_dev;
e3d6f909 598 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 599 unsigned long flags;
600
c66ac9db 601 if (t_state) {
a1d8b49a 602 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 603 cmd->t_state = t_state;
7d680f3b 604 cmd->transport_state |= CMD_T_ACTIVE;
a1d8b49a 605 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 606 }
607
608 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 609
610 /* If the cmd is already on the list, remove it before we add it */
611 if (!list_empty(&cmd->se_queue_node))
612 list_del(&cmd->se_queue_node);
613 else
614 atomic_inc(&qobj->queue_cnt);
615
f7a5cc0b 616 if (at_head)
07bde79a 617 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 618 else
07bde79a 619 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
7d680f3b 620 cmd->transport_state |= CMD_T_QUEUED;
c66ac9db
NB		 621 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
622
c66ac9db 623 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 624}
625
5951146d
AG		 626static struct se_cmd *
627transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 628{
5951146d 629 struct se_cmd *cmd;
c66ac9db
NB		 630 unsigned long flags;
631
632 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
633 if (list_empty(&qobj->qobj_list)) {
634 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
635 return NULL;
636 }
5951146d 637 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 638
7d680f3b 639 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2 640 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 641 atomic_dec(&qobj->queue_cnt);
642 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
643
5951146d 644 return cmd;
c66ac9db
NB		 645}
646
3df8d40b 647static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 648{
3df8d40b 649 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 650 unsigned long flags;
651
652 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
7d680f3b 653 if (!(cmd->transport_state & CMD_T_QUEUED)) {
c66ac9db
NB		 654 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
655 return;
656 }
7d680f3b 657 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2
RD		 658 atomic_dec(&qobj->queue_cnt);
659 list_del_init(&cmd->se_queue_node);
c66ac9db 660 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
c66ac9db
NB		 661}
662
35e0e757
CH		 663static void target_complete_failure_work(struct work_struct *work)
664{
665 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
666
03e98c9e 667 transport_generic_request_failure(cmd);
35e0e757
CH		 668}
669
5787cacd 670void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 671{
42bf829e 672 struct se_device *dev = cmd->se_dev;
5787cacd 673 int success = scsi_status == GOOD;
c66ac9db 674 unsigned long flags;
c66ac9db 675
5787cacd
CH		 676 cmd->scsi_status = scsi_status;
677
678
a1d8b49a 679 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 680 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 681
c66ac9db 682 if (dev && dev->transport->transport_complete) {
5787cacd
CH		 683 if (dev->transport->transport_complete(cmd,
684 cmd->t_data_sg) != 0) {
c66ac9db 685 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
c66ac9db
NB		 686 success = 1;
687 }
688 }
689
690 /*
5787cacd 691 * See if we are waiting to complete for an exception condition.
c66ac9db 692 */
cf572a96 693 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 694 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 695 complete(&cmd->task_stop_comp);
c66ac9db
NB		 696 return;
697 }
2235007c
CH		 698
699 if (!success)
7d680f3b 700 cmd->transport_state |= CMD_T_FAILED;
2235007c 701
3d28934a
NB		 702 /*
703 * Check for case where an explict ABORT_TASK has been received
704 * and transport_wait_for_tasks() will be waiting for completion..
705 */
706 if (cmd->transport_state & CMD_T_ABORTED &&
707 cmd->transport_state & CMD_T_STOP) {
708 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
709 complete(&cmd->t_transport_stop_comp);
710 return;
711 } else if (cmd->transport_state & CMD_T_FAILED) {
41e16e98 712 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 713 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 714 } else {
35e0e757 715 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 716 }
35e0e757 717
35e0e757 718 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 719 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 720 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 721
35e0e757 722 queue_work(target_completion_wq, &cmd->work);
c66ac9db 723}
6bb35e00
CH		 724EXPORT_SYMBOL(target_complete_cmd);
725
cf572a96 726static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 727{
cf572a96
CH		 728 struct se_device *dev = cmd->se_dev;
729 unsigned long flags;
c66ac9db 730
cf572a96
CH		 731 spin_lock_irqsave(&dev->execute_task_lock, flags);
732 if (!cmd->state_active) {
733 list_add_tail(&cmd->state_list, &dev->state_list);
734 cmd->state_active = true;
c66ac9db 735 }
cf572a96 736 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 737}
738
cf572a96 739static void __target_add_to_execute_list(struct se_cmd *cmd)
c66ac9db 740{
cf572a96
CH		 741 struct se_device *dev = cmd->se_dev;
742 bool head_of_queue = false;
c66ac9db 743
cf572a96 744 if (!list_empty(&cmd->execute_list))
c66ac9db 745 return;
c66ac9db 746
cf572a96
CH		 747 if (dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED &&
748 cmd->sam_task_attr == MSG_HEAD_TAG)
749 head_of_queue = true;
c66ac9db 750
cf572a96
CH		 751 if (head_of_queue)
752 list_add(&cmd->execute_list, &dev->execute_list);
753 else
754 list_add_tail(&cmd->execute_list, &dev->execute_list);
785fdf70 755
cf572a96 756 atomic_inc(&dev->execute_tasks);
1880807a 757
cf572a96
CH		 758 if (cmd->state_active)
759 return;
c66ac9db 760
cf572a96
CH		 761 if (head_of_queue)
762 list_add(&cmd->state_list, &dev->state_list);
763 else
764 list_add_tail(&cmd->state_list, &dev->state_list);
c66ac9db 765
cf572a96 766 cmd->state_active = true;
4d2300cc
NB		 767}
768
cf572a96 769static void target_add_to_execute_list(struct se_cmd *cmd)
4d2300cc
NB		 770{
771 unsigned long flags;
772 struct se_device *dev = cmd->se_dev;
773
774 spin_lock_irqsave(&dev->execute_task_lock, flags);
cf572a96 775 __target_add_to_execute_list(cmd);
c66ac9db 776 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 777}
778
cf572a96 779void __target_remove_from_execute_list(struct se_cmd *cmd)
04629b7b 780{
cf572a96
CH		 781 list_del_init(&cmd->execute_list);
782 atomic_dec(&cmd->se_dev->execute_tasks);
04629b7b
CH		 783}
784
cf572a96 785static void target_remove_from_execute_list(struct se_cmd *cmd)
c66ac9db 786{
cf572a96 787 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 788 unsigned long flags;
789
cf572a96 790 if (WARN_ON(list_empty(&cmd->execute_list)))
af57c3ac 791 return;
af57c3ac 792
c66ac9db 793 spin_lock_irqsave(&dev->execute_task_lock, flags);
cf572a96 794 __target_remove_from_execute_list(cmd);
c66ac9db
NB		 795 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
796}
797
07bde79a 798/*
f147abb4 799 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 800 */
801
802static void target_qf_do_work(struct work_struct *work)
803{
804 struct se_device *dev = container_of(work, struct se_device,
805 qf_work_queue);
bcac364a 806 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 807 struct se_cmd *cmd, *cmd_tmp;
808
809 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 810 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
811 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 812
bcac364a 813 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 814 list_del(&cmd->se_qf_node);
815 atomic_dec(&dev->dev_qf_count);
816 smp_mb__after_atomic_dec();
07bde79a 817
6708bb27 818 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 819 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 820 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 821 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
822 : "UNKNOWN");
f7a5cc0b
CH		 823
824 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 825 }
07bde79a
NB		 826}
827
c66ac9db
NB		 828unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
829{
830 switch (cmd->data_direction) {
831 case DMA_NONE:
832 return "NONE";
833 case DMA_FROM_DEVICE:
834 return "READ";
835 case DMA_TO_DEVICE:
836 return "WRITE";
837 case DMA_BIDIRECTIONAL:
838 return "BIDI";
839 default:
840 break;
841 }
842
843 return "UNKNOWN";
844}
845
846void transport_dump_dev_state(
847 struct se_device *dev,
848 char *b,
849 int *bl)
850{
851 *bl += sprintf(b + *bl, "Status: ");
852 switch (dev->dev_status) {
853 case TRANSPORT_DEVICE_ACTIVATED:
854 *bl += sprintf(b + *bl, "ACTIVATED");
855 break;
856 case TRANSPORT_DEVICE_DEACTIVATED:
857 *bl += sprintf(b + *bl, "DEACTIVATED");
858 break;
859 case TRANSPORT_DEVICE_SHUTDOWN:
860 *bl += sprintf(b + *bl, "SHUTDOWN");
861 break;
862 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
863 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
864 *bl += sprintf(b + *bl, "OFFLINE");
865 break;
866 default:
867 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
868 break;
869 }
870
65586d51
NB		 871 *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d",
872 atomic_read(&dev->execute_tasks), dev->queue_depth);
c66ac9db 873 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 874 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 875 *bl += sprintf(b + *bl, " ");
876}
877
c66ac9db
NB		 878void transport_dump_vpd_proto_id(
879 struct t10_vpd *vpd,
880 unsigned char *p_buf,
881 int p_buf_len)
882{
883 unsigned char buf[VPD_TMP_BUF_SIZE];
884 int len;
885
886 memset(buf, 0, VPD_TMP_BUF_SIZE);
887 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
888
889 switch (vpd->protocol_identifier) {
890 case 0x00:
891 sprintf(buf+len, "Fibre Channel\n");
892 break;
893 case 0x10:
894 sprintf(buf+len, "Parallel SCSI\n");
895 break;
896 case 0x20:
897 sprintf(buf+len, "SSA\n");
898 break;
899 case 0x30:
900 sprintf(buf+len, "IEEE 1394\n");
901 break;
902 case 0x40:
903 sprintf(buf+len, "SCSI Remote Direct Memory Access"
904 " Protocol\n");
905 break;
906 case 0x50:
907 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
908 break;
909 case 0x60:
910 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
911 break;
912 case 0x70:
913 sprintf(buf+len, "Automation/Drive Interface Transport"
914 " Protocol\n");
915 break;
916 case 0x80:
917 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
918 break;
919 default:
920 sprintf(buf+len, "Unknown 0x%02x\n",
921 vpd->protocol_identifier);
922 break;
923 }
924
925 if (p_buf)
926 strncpy(p_buf, buf, p_buf_len);
927 else
6708bb27 928 pr_debug("%s", buf);
c66ac9db
NB		 929}
930
931void
932transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
933{
934 /*
935 * Check if the Protocol Identifier Valid (PIV) bit is set..
936 *
937 * from spc3r23.pdf section 7.5.1
938 */
939 if (page_83[1] & 0x80) {
940 vpd->protocol_identifier = (page_83[0] & 0xf0);
941 vpd->protocol_identifier_set = 1;
942 transport_dump_vpd_proto_id(vpd, NULL, 0);
943 }
944}
945EXPORT_SYMBOL(transport_set_vpd_proto_id);
946
947int transport_dump_vpd_assoc(
948 struct t10_vpd *vpd,
949 unsigned char *p_buf,
950 int p_buf_len)
951{
952 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 953 int ret = 0;
954 int len;
c66ac9db
NB		 955
956 memset(buf, 0, VPD_TMP_BUF_SIZE);
957 len = sprintf(buf, "T10 VPD Identifier Association: ");
958
959 switch (vpd->association) {
960 case 0x00:
961 sprintf(buf+len, "addressed logical unit\n");
962 break;
963 case 0x10:
964 sprintf(buf+len, "target port\n");
965 break;
966 case 0x20:
967 sprintf(buf+len, "SCSI target device\n");
968 break;
969 default:
970 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 971 ret = -EINVAL;
c66ac9db
NB		 972 break;
973 }
974
975 if (p_buf)
976 strncpy(p_buf, buf, p_buf_len);
977 else
6708bb27 978 pr_debug("%s", buf);
c66ac9db
NB		 979
980 return ret;
981}
982
983int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
984{
985 /*
986 * The VPD identification association..
987 *
988 * from spc3r23.pdf Section 7.6.3.1 Table 297
989 */
990 vpd->association = (page_83[1] & 0x30);
991 return transport_dump_vpd_assoc(vpd, NULL, 0);
992}
993EXPORT_SYMBOL(transport_set_vpd_assoc);
994
995int transport_dump_vpd_ident_type(
996 struct t10_vpd *vpd,
997 unsigned char *p_buf,
998 int p_buf_len)
999{
1000 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1001 int ret = 0;
1002 int len;
c66ac9db
NB		 1003
1004 memset(buf, 0, VPD_TMP_BUF_SIZE);
1005 len = sprintf(buf, "T10 VPD Identifier Type: ");
1006
1007 switch (vpd->device_identifier_type) {
1008 case 0x00:
1009 sprintf(buf+len, "Vendor specific\n");
1010 break;
1011 case 0x01:
1012 sprintf(buf+len, "T10 Vendor ID based\n");
1013 break;
1014 case 0x02:
1015 sprintf(buf+len, "EUI-64 based\n");
1016 break;
1017 case 0x03:
1018 sprintf(buf+len, "NAA\n");
1019 break;
1020 case 0x04:
1021 sprintf(buf+len, "Relative target port identifier\n");
1022 break;
1023 case 0x08:
1024 sprintf(buf+len, "SCSI name string\n");
1025 break;
1026 default:
1027 sprintf(buf+len, "Unsupported: 0x%02x\n",
1028 vpd->device_identifier_type);
e3d6f909 1029 ret = -EINVAL;
c66ac9db
NB		 1030 break;
1031 }
1032
e3d6f909
AG		 1033 if (p_buf) {
1034 if (p_buf_len < strlen(buf)+1)
1035 return -EINVAL;
c66ac9db 1036 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1037 } else {
6708bb27 1038 pr_debug("%s", buf);
e3d6f909 1039 }
c66ac9db
NB		 1040
1041 return ret;
1042}
1043
1044int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1045{
1046 /*
1047 * The VPD identifier type..
1048 *
1049 * from spc3r23.pdf Section 7.6.3.1 Table 298
1050 */
1051 vpd->device_identifier_type = (page_83[1] & 0x0f);
1052 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1053}
1054EXPORT_SYMBOL(transport_set_vpd_ident_type);
1055
1056int transport_dump_vpd_ident(
1057 struct t10_vpd *vpd,
1058 unsigned char *p_buf,
1059 int p_buf_len)
1060{
1061 unsigned char buf[VPD_TMP_BUF_SIZE];
1062 int ret = 0;
1063
1064 memset(buf, 0, VPD_TMP_BUF_SIZE);
1065
1066 switch (vpd->device_identifier_code_set) {
1067 case 0x01: /* Binary */
1068 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1069 &vpd->device_identifier[0]);
1070 break;
1071 case 0x02: /* ASCII */
1072 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1073 &vpd->device_identifier[0]);
1074 break;
1075 case 0x03: /* UTF-8 */
1076 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1077 &vpd->device_identifier[0]);
1078 break;
1079 default:
1080 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1081 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1082 ret = -EINVAL;
c66ac9db
NB		 1083 break;
1084 }
1085
1086 if (p_buf)
1087 strncpy(p_buf, buf, p_buf_len);
1088 else
6708bb27 1089 pr_debug("%s", buf);
c66ac9db
NB		 1090
1091 return ret;
1092}
1093
1094int
1095transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1096{
1097 static const char hex_str[] = "0123456789abcdef";
1098 int j = 0, i = 4; /* offset to start of the identifer */
1099
1100 /*
1101 * The VPD Code Set (encoding)
1102 *
1103 * from spc3r23.pdf Section 7.6.3.1 Table 296
1104 */
1105 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1106 switch (vpd->device_identifier_code_set) {
1107 case 0x01: /* Binary */
1108 vpd->device_identifier[j++] =
1109 hex_str[vpd->device_identifier_type];
1110 while (i < (4 + page_83[3])) {
1111 vpd->device_identifier[j++] =
1112 hex_str[(page_83[i] & 0xf0) >> 4];
1113 vpd->device_identifier[j++] =
1114 hex_str[page_83[i] & 0x0f];
1115 i++;
1116 }
1117 break;
1118 case 0x02: /* ASCII */
1119 case 0x03: /* UTF-8 */
1120 while (i < (4 + page_83[3]))
1121 vpd->device_identifier[j++] = page_83[i++];
1122 break;
1123 default:
1124 break;
1125 }
1126
1127 return transport_dump_vpd_ident(vpd, NULL, 0);
1128}
1129EXPORT_SYMBOL(transport_set_vpd_ident);
1130
1131static void core_setup_task_attr_emulation(struct se_device *dev)
1132{
1133 /*
1134 * If this device is from Target_Core_Mod/pSCSI, disable the
1135 * SAM Task Attribute emulation.
1136 *
1137 * This is currently not available in upsream Linux/SCSI Target
1138 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1139 */
e3d6f909 1140 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1141 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1142 return;
1143 }
1144
1145 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1146 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1147 " device\n", dev->transport->name,
1148 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1149}
1150
1151static void scsi_dump_inquiry(struct se_device *dev)
1152{
e3d6f909 1153 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1154 char buf[17];
c66ac9db
NB		 1155 int i, device_type;
1156 /*
1157 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1158 */
c66ac9db
NB		 1159 for (i = 0; i < 8; i++)
1160 if (wwn->vendor[i] >= 0x20)
e59a41b6 1161 buf[i] = wwn->vendor[i];
c66ac9db 1162 else
e59a41b6
SAS		 1163 buf[i] = ' ';
1164 buf[i] = '\0';
1165 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1166
c66ac9db
NB		 1167 for (i = 0; i < 16; i++)
1168 if (wwn->model[i] >= 0x20)
e59a41b6 1169 buf[i] = wwn->model[i];
c66ac9db 1170 else
e59a41b6
SAS		 1171 buf[i] = ' ';
1172 buf[i] = '\0';
1173 pr_debug(" Model: %s\n", buf);
c66ac9db 1174
c66ac9db
NB		 1175 for (i = 0; i < 4; i++)
1176 if (wwn->revision[i] >= 0x20)
e59a41b6 1177 buf[i] = wwn->revision[i];
c66ac9db 1178 else
e59a41b6
SAS		 1179 buf[i] = ' ';
1180 buf[i] = '\0';
1181 pr_debug(" Revision: %s\n", buf);
c66ac9db 1182
e3d6f909 1183 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1184 pr_debug(" Type: %s ", scsi_device_type(device_type));
1185 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1186 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1187}
1188
1189struct se_device *transport_add_device_to_core_hba(
1190 struct se_hba *hba,
1191 struct se_subsystem_api *transport,
1192 struct se_subsystem_dev *se_dev,
1193 u32 device_flags,
1194 void *transport_dev,
1195 struct se_dev_limits *dev_limits,
1196 const char *inquiry_prod,
1197 const char *inquiry_rev)
1198{
12a18bdc 1199 int force_pt;
c66ac9db
NB		 1200 struct se_device *dev;
1201
1202 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1203 if (!dev) {
1204 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1205 return NULL;
1206 }
c66ac9db 1207
e3d6f909 1208 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1209 dev->dev_flags = device_flags;
1210 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1211 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1212 dev->se_hba = hba;
1213 dev->se_sub_dev = se_dev;
1214 dev->transport = transport;
c66ac9db
NB		 1215 INIT_LIST_HEAD(&dev->dev_list);
1216 INIT_LIST_HEAD(&dev->dev_sep_list);
1217 INIT_LIST_HEAD(&dev->dev_tmr_list);
cf572a96 1218 INIT_LIST_HEAD(&dev->execute_list);
c66ac9db 1219 INIT_LIST_HEAD(&dev->delayed_cmd_list);
cf572a96 1220 INIT_LIST_HEAD(&dev->state_list);
07bde79a 1221 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1222 spin_lock_init(&dev->execute_task_lock);
1223 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1224 spin_lock_init(&dev->dev_reservation_lock);
1225 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1226 spin_lock_init(&dev->se_port_lock);
1227 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1228 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1229 atomic_set(&dev->dev_ordered_id, 0);
1230
1231 se_dev_set_default_attribs(dev, dev_limits);
1232
1233 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1234 dev->creation_time = get_jiffies_64();
1235 spin_lock_init(&dev->stats_lock);
1236
1237 spin_lock(&hba->device_lock);
1238 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1239 hba->dev_count++;
1240 spin_unlock(&hba->device_lock);
1241 /*
1242 * Setup the SAM Task Attribute emulation for struct se_device
1243 */
1244 core_setup_task_attr_emulation(dev);
1245 /*
1246 * Force PR and ALUA passthrough emulation with internal object use.
1247 */
1248 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1249 /*
1250 * Setup the Reservations infrastructure for struct se_device
1251 */
1252 core_setup_reservations(dev, force_pt);
1253 /*
1254 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1255 */
1256 if (core_setup_alua(dev, force_pt) < 0)
1257 goto out;
1258
1259 /*
1260 * Startup the struct se_device processing thread
1261 */
1262 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1263 "LIO_%s", dev->transport->name);
c66ac9db 1264 if (IS_ERR(dev->process_thread)) {
6708bb27 1265 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1266 dev->transport->name);
c66ac9db
NB		 1267 goto out;
1268 }
07bde79a
NB		 1269 /*
1270 * Setup work_queue for QUEUE_FULL
1271 */
1272 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1273 /*
1274 * Preload the initial INQUIRY const values if we are doing
1275 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1276 * passthrough because this is being provided by the backend LLD.
1277 * This is required so that transport_get_inquiry() copies these
1278 * originals once back into DEV_T10_WWN(dev) for the virtual device
1279 * setup.
1280 */
e3d6f909 1281 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1282 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1283 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1284 " INQUIRY consts\n");
1285 goto out;
1286 }
1287
e3d6f909
AG		 1288 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1289 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1290 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1291 }
1292 scsi_dump_inquiry(dev);
1293
12a18bdc 1294 return dev;
c66ac9db 1295out:
c66ac9db
NB		 1296 kthread_stop(dev->process_thread);
1297
1298 spin_lock(&hba->device_lock);
1299 list_del(&dev->dev_list);
1300 hba->dev_count--;
1301 spin_unlock(&hba->device_lock);
1302
1303 se_release_vpd_for_dev(dev);
1304
c66ac9db
NB		 1305 kfree(dev);
1306
1307 return NULL;
1308}
1309EXPORT_SYMBOL(transport_add_device_to_core_hba);
1310
1311/* transport_generic_prepare_cdb():
1312 *
1313 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1314 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1315 * The point of this is since we are mapping iSCSI LUNs to
1316 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1317 * devices and HBAs for a loop.
1318 */
1319static inline void transport_generic_prepare_cdb(
1320 unsigned char *cdb)
1321{
1322 switch (cdb[0]) {
1323 case READ_10: /* SBC - RDProtect */
1324 case READ_12: /* SBC - RDProtect */
1325 case READ_16: /* SBC - RDProtect */
1326 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1327 case VERIFY: /* SBC - VRProtect */
1328 case VERIFY_16: /* SBC - VRProtect */
1329 case WRITE_VERIFY: /* SBC - VRProtect */
1330 case WRITE_VERIFY_12: /* SBC - VRProtect */
1331 break;
1332 default:
1333 cdb[1] &= 0x1f; /* clear logical unit number */
1334 break;
1335 }
1336}
1337
c66ac9db
NB		 1338static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1339
c66ac9db
NB		 1340/*
1341 * Used by fabric modules containing a local struct se_cmd within their
1342 * fabric dependent per I/O descriptor.
1343 */
1344void transport_init_se_cmd(
1345 struct se_cmd *cmd,
1346 struct target_core_fabric_ops *tfo,
1347 struct se_session *se_sess,
1348 u32 data_length,
1349 int data_direction,
1350 int task_attr,
1351 unsigned char *sense_buffer)
1352{
5951146d
AG		 1353 INIT_LIST_HEAD(&cmd->se_lun_node);
1354 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1355 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1356 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1357 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96
CH		 1358 INIT_LIST_HEAD(&cmd->execute_list);
1359 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1360 init_completion(&cmd->transport_lun_fe_stop_comp);
1361 init_completion(&cmd->transport_lun_stop_comp);
1362 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1363 init_completion(&cmd->cmd_wait_comp);
cf572a96 1364 init_completion(&cmd->task_stop_comp);
a1d8b49a 1365 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1366 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1367
1368 cmd->se_tfo = tfo;
1369 cmd->se_sess = se_sess;
1370 cmd->data_length = data_length;
1371 cmd->data_direction = data_direction;
1372 cmd->sam_task_attr = task_attr;
1373 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1374
1375 cmd->state_active = false;
c66ac9db
NB		 1376}
1377EXPORT_SYMBOL(transport_init_se_cmd);
1378
1379static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1380{
1381 /*
1382 * Check if SAM Task Attribute emulation is enabled for this
1383 * struct se_device storage object
1384 */
5951146d 1385 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1386 return 0;
1387
e66ecd50 1388 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1389 pr_debug("SAM Task Attribute ACA"
c66ac9db 1390 " emulation is not supported\n");
e3d6f909 1391 return -EINVAL;
c66ac9db
NB		 1392 }
1393 /*
1394 * Used to determine when ORDERED commands should go from
1395 * Dormant to Active status.
1396 */
5951146d 1397 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1398 smp_mb__after_atomic_inc();
6708bb27 1399 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1400 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1401 cmd->se_dev->transport->name);
c66ac9db
NB		 1402 return 0;
1403}
1404
a12f41f8 1405/* target_setup_cmd_from_cdb():
c66ac9db
NB		 1406 *
1407 * Called from fabric RX Thread.
1408 */
a12f41f8 1409int target_setup_cmd_from_cdb(
c66ac9db
NB		 1410 struct se_cmd *cmd,
1411 unsigned char *cdb)
1412{
1413 int ret;
1414
1415 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1416 /*
1417 * Ensure that the received CDB is less than the max (252 + 8) bytes
1418 * for VARIABLE_LENGTH_CMD
1419 */
1420 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1421 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1422 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1423 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1424 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1425 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1426 return -EINVAL;
c66ac9db
NB		 1427 }
1428 /*
1429 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1430 * allocate the additional extended CDB buffer now.. Otherwise
1431 * setup the pointer from __t_task_cdb to t_task_cdb.
1432 */
a1d8b49a
AG		 1433 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1434 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1435 GFP_KERNEL);
6708bb27
AG		 1436 if (!cmd->t_task_cdb) {
1437 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1438 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1439 scsi_command_size(cdb),
a1d8b49a 1440 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1441 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1442 cmd->scsi_sense_reason =
1443 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1444 return -ENOMEM;
c66ac9db
NB		 1445 }
1446 } else
a1d8b49a 1447 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1448 /*
a1d8b49a 1449 * Copy the original CDB into cmd->
c66ac9db 1450 */
a1d8b49a 1451 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1452 /*
1453 * Setup the received CDB based on SCSI defined opcodes and
1454 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1455 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1456 * pointer is expected to be setup before we reach this point.
1457 */
1458 ret = transport_generic_cmd_sequencer(cmd, cdb);
1459 if (ret < 0)
1460 return ret;
1461 /*
1462 * Check for SAM Task Attribute Emulation
1463 */
1464 if (transport_check_alloc_task_attr(cmd) < 0) {
1465 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1466 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1467 return -EINVAL;
c66ac9db
NB		 1468 }
1469 spin_lock(&cmd->se_lun->lun_sep_lock);
1470 if (cmd->se_lun->lun_sep)
1471 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1472 spin_unlock(&cmd->se_lun->lun_sep_lock);
1473 return 0;
1474}
a12f41f8 1475EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1476
695434e1
NB		 1477/*
1478 * Used by fabric module frontends to queue tasks directly.
1479 * Many only be used from process context only
1480 */
1481int transport_handle_cdb_direct(
1482 struct se_cmd *cmd)
1483{
dd8ae59d
NB		 1484 int ret;
1485
695434e1
NB		 1486 if (!cmd->se_lun) {
1487 dump_stack();
6708bb27 1488 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1489 return -EINVAL;
1490 }
1491 if (in_interrupt()) {
1492 dump_stack();
6708bb27 1493 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1494 " from interrupt context\n");
1495 return -EINVAL;
1496 }
dd8ae59d 1497 /*
7d680f3b 1498 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
dd8ae59d
NB		 1499 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1500 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1501 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1502 *
1503 * Also, we don't take cmd->t_state_lock here as we only expect
1504 * this to be called for initial descriptor submission.
1505 */
1506 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1507 cmd->transport_state |= CMD_T_ACTIVE;
1508
dd8ae59d
NB		 1509 /*
1510 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1511 * so follow TRANSPORT_NEW_CMD processing thread context usage
1512 * and call transport_generic_request_failure() if necessary..
1513 */
1514 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1515 if (ret < 0)
1516 transport_generic_request_failure(cmd);
1517
dd8ae59d 1518 return 0;
695434e1
NB		 1519}
1520EXPORT_SYMBOL(transport_handle_cdb_direct);
1521
a6360785
NB		 1522/**
1523 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1524 *
1525 * @se_cmd: command descriptor to submit
1526 * @se_sess: associated se_sess for endpoint
1527 * @cdb: pointer to SCSI CDB
1528 * @sense: pointer to SCSI sense buffer
1529 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1530 * @data_length: fabric expected data transfer length
1531 * @task_addr: SAM task attribute
1532 * @data_dir: DMA data direction
1533 * @flags: flags for command submission from target_sc_flags_tables
1534 *
1535 * This may only be called from process context, and also currently
1536 * assumes internal allocation of fabric payload buffer by target-core.
1537 **/
1edcdb49 1538void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1539 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1540 u32 data_length, int task_attr, int data_dir, int flags)
1541{
1542 struct se_portal_group *se_tpg;
1543 int rc;
1544
1545 se_tpg = se_sess->se_tpg;
1546 BUG_ON(!se_tpg);
1547 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1548 BUG_ON(in_interrupt());
1549 /*
1550 * Initialize se_cmd for target operation. From this point
1551 * exceptions are handled by sending exception status via
1552 * target_core_fabric_ops->queue_status() callback
1553 */
1554 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1555 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1556 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1557 se_cmd->unknown_data_length = 1;
a6360785
NB		 1558 /*
1559 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1560 * se_sess->sess_cmd_list. A second kref_get here is necessary
1561 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1562 * kref_put() to happen during fabric packet acknowledgement.
1563 */
1564 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1565 /*
1566 * Signal bidirectional data payloads to target-core
1567 */
1568 if (flags & TARGET_SCF_BIDI_OP)
1569 se_cmd->se_cmd_flags |= SCF_BIDI;
1570 /*
1571 * Locate se_lun pointer and attach it to struct se_cmd
1572 */
735703ca
NB		 1573 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1574 transport_send_check_condition_and_sense(se_cmd,
1575 se_cmd->scsi_sense_reason, 0);
1576 target_put_sess_cmd(se_sess, se_cmd);
1577 return;
1578 }
a6360785
NB		 1579 /*
1580 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1581 * allocate the necessary tasks to complete the received CDB+data
1582 */
a12f41f8 1583 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca
NB		 1584 if (rc != 0) {
1585 transport_generic_request_failure(se_cmd);
1586 return;
1587 }
11e319ed
AG		 1588
1589 /*
1590 * Check if we need to delay processing because of ALUA
1591 * Active/NonOptimized primary access state..
1592 */
1593 core_alua_check_nonop_delay(se_cmd);
1594
a6360785
NB		 1595 /*
1596 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1597 * for immediate execution of READs, otherwise wait for
1598 * transport_generic_handle_data() to be called for WRITEs
1599 * when fabric has filled the incoming buffer.
1600 */
1601 transport_handle_cdb_direct(se_cmd);
1edcdb49 1602 return;
a6360785
NB		 1603}
1604EXPORT_SYMBOL(target_submit_cmd);
1605
9f0d05c2
NB		 1606static void target_complete_tmr_failure(struct work_struct *work)
1607{
1608 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1609
1610 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1611 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1612 transport_generic_free_cmd(se_cmd, 0);
1613}
1614
ea98d7f9
AG		 1615/**
1616 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1617 * for TMR CDBs
1618 *
1619 * @se_cmd: command descriptor to submit
1620 * @se_sess: associated se_sess for endpoint
1621 * @sense: pointer to SCSI sense buffer
1622 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1623 * @fabric_context: fabric context for TMR req
1624 * @tm_type: Type of TM request
c0974f89
NB		 1625 * @gfp: gfp type for caller
1626 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1627 * @flags: submit cmd flags
ea98d7f9
AG		 1628 *
1629 * Callable from all contexts.
1630 **/
1631
c7042cae 1632int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1633 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1634 void *fabric_tmr_ptr, unsigned char tm_type,
1635 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1636{
1637 struct se_portal_group *se_tpg;
1638 int ret;
1639
1640 se_tpg = se_sess->se_tpg;
1641 BUG_ON(!se_tpg);
1642
1643 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1644 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1645 /*
1646 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1647 * allocation failure.
1648 */
c0974f89 1649 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1650 if (ret < 0)
1651 return -ENOMEM;
ea98d7f9 1652
c0974f89
NB		 1653 if (tm_type == TMR_ABORT_TASK)
1654 se_cmd->se_tmr_req->ref_task_tag = tag;
1655
ea98d7f9
AG		 1656 /* See target_submit_cmd for commentary */
1657 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1658
ea98d7f9
AG		 1659 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1660 if (ret) {
9f0d05c2
NB		 1661 /*
1662 * For callback during failure handling, push this work off
1663 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1664 */
1665 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1666 schedule_work(&se_cmd->work);
c7042cae 1667 return 0;
ea98d7f9
AG		 1668 }
1669 transport_generic_handle_tmr(se_cmd);
c7042cae 1670 return 0;
ea98d7f9
AG		 1671}
1672EXPORT_SYMBOL(target_submit_tmr);
1673
c66ac9db
NB		 1674/*
1675 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1676 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1677 * complete setup in TCM process context w/ TFO->new_cmd_map().
1678 */
1679int transport_generic_handle_cdb_map(
1680 struct se_cmd *cmd)
1681{
e3d6f909 1682 if (!cmd->se_lun) {
c66ac9db 1683 dump_stack();
6708bb27 1684 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1685 return -EINVAL;
c66ac9db
NB		 1686 }
1687
f7a5cc0b 1688 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1689 return 0;
1690}
1691EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1692
1693/* transport_generic_handle_data():
1694 *
1695 *
1696 */
1697int transport_generic_handle_data(
1698 struct se_cmd *cmd)
1699{
1700 /*
1701 * For the software fabric case, then we assume the nexus is being
1702 * failed/shutdown when signals are pending from the kthread context
1703 * caller, so we return a failure. For the HW target mode case running
1704 * in interrupt code, the signal_pending() check is skipped.
1705 */
1706 if (!in_interrupt() && signal_pending(current))
e3d6f909 1707 return -EPERM;
c66ac9db
NB		 1708 /*
1709 * If the received CDB has aleady been ABORTED by the generic
1710 * target engine, we now call transport_check_aborted_status()
1711 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1712 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1713 * sequences at this point.
1714 */
1715 if (transport_check_aborted_status(cmd, 1) != 0)
1716 return 0;
1717
f7a5cc0b 1718 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1719 return 0;
1720}
1721EXPORT_SYMBOL(transport_generic_handle_data);
1722
1723/* transport_generic_handle_tmr():
1724 *
1725 *
1726 */
1727int transport_generic_handle_tmr(
1728 struct se_cmd *cmd)
1729{
f7a5cc0b 1730 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1731 return 0;
1732}
1733EXPORT_SYMBOL(transport_generic_handle_tmr);
1734
cdbb70bb 1735/*
cf572a96 1736 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1737 * has completed.
1738 */
cf572a96 1739bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1740{
cdbb70bb
CH		 1741 bool was_active = false;
1742
cf572a96
CH		 1743 if (cmd->transport_state & CMD_T_BUSY) {
1744 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1745 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1746
cf572a96
CH		 1747 pr_debug("cmd %p waiting to complete\n", cmd);
1748 wait_for_completion(&cmd->task_stop_comp);
1749 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1750
1751 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1752 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1753 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1754 was_active = true;
1755 }
1756
cdbb70bb
CH		 1757 return was_active;
1758}
1759
c66ac9db
NB		 1760/*
1761 * Handle SAM-esque emulation for generic transport request failures.
1762 */
2fbff127 1763void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1764{
07bde79a
NB		 1765 int ret = 0;
1766
6708bb27 1767 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1768 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1769 cmd->t_task_cdb[0]);
03e98c9e 1770 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1771 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1772 cmd->t_state, cmd->scsi_sense_reason);
d43d6aea 1773 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1774 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1775 (cmd->transport_state & CMD_T_STOP) != 0,
1776 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1777
c66ac9db
NB		 1778 /*
1779 * For SAM Task Attribute emulation for failed struct se_cmd
1780 */
1781 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1782 transport_complete_task_attr(cmd);
1783
03e98c9e
NB		 1784 switch (cmd->scsi_sense_reason) {
1785 case TCM_NON_EXISTENT_LUN:
1786 case TCM_UNSUPPORTED_SCSI_OPCODE:
1787 case TCM_INVALID_CDB_FIELD:
1788 case TCM_INVALID_PARAMETER_LIST:
1789 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1790 case TCM_UNKNOWN_MODE_PAGE:
1791 case TCM_WRITE_PROTECTED:
1792 case TCM_CHECK_CONDITION_ABORT_CMD:
1793 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1794 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1795 break;
03e98c9e 1796 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1797 /*
1798 * No SENSE Data payload for this case, set SCSI Status
1799 * and queue the response to $FABRIC_MOD.
1800 *
1801 * Uses linux/include/scsi/scsi.h SAM status codes defs
1802 */
1803 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1804 /*
1805 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1806 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1807 * CONFLICT STATUS.
1808 *
1809 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1810 */
e3d6f909
AG		 1811 if (cmd->se_sess &&
1812 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1813 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1814 cmd->orig_fe_lun, 0x2C,
1815 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1816
07bde79a 1817 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1818 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1819 goto queue_full;
c66ac9db 1820 goto check_stop;
c66ac9db 1821 default:
6708bb27 1822 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1823 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1824 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1825 break;
1826 }
16ab8e60
NB		 1827 /*
1828 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1829 * make the call to transport_send_check_condition_and_sense()
1830 * directly. Otherwise expect the fabric to make the call to
1831 * transport_send_check_condition_and_sense() after handling
1832 * possible unsoliticied write data payloads.
1833 */
03e98c9e
NB		 1834 ret = transport_send_check_condition_and_sense(cmd,
1835 cmd->scsi_sense_reason, 0);
1836 if (ret == -EAGAIN || ret == -ENOMEM)
1837 goto queue_full;
07bde79a 1838
c66ac9db
NB		 1839check_stop:
1840 transport_lun_remove_cmd(cmd);
6708bb27 1841 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1842 ;
07bde79a
NB		 1843 return;
1844
1845queue_full:
e057f533
CH		 1846 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1847 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1848}
2fbff127 1849EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1850
c66ac9db
NB		 1851static inline u32 transport_lba_21(unsigned char *cdb)
1852{
1853 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1854}
1855
1856static inline u32 transport_lba_32(unsigned char *cdb)
1857{
1858 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1859}
1860
1861static inline unsigned long long transport_lba_64(unsigned char *cdb)
1862{
1863 unsigned int __v1, __v2;
1864
1865 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1866 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1867
1868 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1869}
1870
1871/*
1872 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1873 */
1874static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1875{
1876 unsigned int __v1, __v2;
1877
1878 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1879 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1880
1881 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1882}
1883
1884static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1885{
1886 unsigned long flags;
1887
a1d8b49a 1888 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 1889 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 1890 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 1891}
1892
c66ac9db
NB		 1893/*
1894 * Called from Fabric Module context from transport_execute_tasks()
1895 *
1896 * The return of this function determins if the tasks from struct se_cmd
1897 * get added to the execution queue in transport_execute_tasks(),
1898 * or are added to the delayed or ordered lists here.
1899 */
1900static inline int transport_execute_task_attr(struct se_cmd *cmd)
1901{
5951146d 1902 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1903 return 1;
1904 /*
25985edc 1905 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1906 * to allow the passed struct se_cmd list of tasks to the front of the list.
1907 */
e66ecd50 1908 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
6708bb27 1909 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 1910 " 0x%02x, se_ordered_id: %u\n",
6708bb27 1911 cmd->t_task_cdb[0],
c66ac9db
NB		 1912 cmd->se_ordered_id);
1913 return 1;
e66ecd50 1914 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d 1915 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 1916 smp_mb__after_atomic_inc();
1917
6708bb27 1918 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 1919 " list, se_ordered_id: %u\n",
a1d8b49a 1920 cmd->t_task_cdb[0],
c66ac9db
NB		 1921 cmd->se_ordered_id);
1922 /*
1923 * Add ORDERED command to tail of execution queue if
1924 * no other older commands exist that need to be
1925 * completed first.
1926 */
6708bb27 1927 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 1928 return 1;
1929 } else {
1930 /*
1931 * For SIMPLE and UNTAGGED Task Attribute commands
1932 */
5951146d 1933 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 1934 smp_mb__after_atomic_inc();
1935 }
1936 /*
1937 * Otherwise if one or more outstanding ORDERED task attribute exist,
1938 * add the dormant task(s) built for the passed struct se_cmd to the
1939 * execution queue and become in Active state for this struct se_device.
1940 */
5951146d 1941 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 1942 /*
1943 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 1944 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 1945 */
5951146d 1946 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 1947 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 1948 list_add_tail(&cmd->se_delayed_node,
1949 &cmd->se_dev->delayed_cmd_list);
1950 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 1951
6708bb27 1952 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 1953 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 1954 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 1955 cmd->se_ordered_id);
1956 /*
1957 * Return zero to let transport_execute_tasks() know
1958 * not to add the delayed tasks to the execution list.
1959 */
1960 return 0;
1961 }
1962 /*
1963 * Otherwise, no ORDERED task attributes exist..
1964 */
1965 return 1;
1966}
1967
1968/*
1969 * Called from fabric module context in transport_generic_new_cmd() and
1970 * transport_generic_process_write()
1971 */
1972static int transport_execute_tasks(struct se_cmd *cmd)
1973{
1974 int add_tasks;
40be67f4 1975 struct se_device *se_dev = cmd->se_dev;
c66ac9db
NB		 1976 /*
1977 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 1978 * has occurred that prevents execution.
c66ac9db 1979 */
6708bb27 1980 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 1981 /*
1982 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
1983 * attribute for the tasks of the received struct se_cmd CDB
1984 */
1985 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 1986 if (!add_tasks)
c66ac9db 1987 goto execute_tasks;
cf572a96 1988
4d2300cc
NB		 1989 __transport_execute_tasks(se_dev, cmd);
1990 return 0;
c66ac9db 1991 }
4d2300cc 1992
c66ac9db 1993execute_tasks:
4d2300cc 1994 __transport_execute_tasks(se_dev, NULL);
c66ac9db
NB		 1995 return 0;
1996}
1997
4d2300cc 1998static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
c66ac9db
NB		 1999{
2000 int error;
2001 struct se_cmd *cmd = NULL;
c66ac9db
NB		 2002 unsigned long flags;
2003
c66ac9db 2004check_depth:
e3d6f909 2005 spin_lock_irq(&dev->execute_task_lock);
4d2300cc 2006 if (new_cmd != NULL)
cf572a96 2007 __target_add_to_execute_list(new_cmd);
4d2300cc 2008
cf572a96 2009 if (list_empty(&dev->execute_list)) {
e3d6f909 2010 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2011 return 0;
2012 }
cf572a96
CH		 2013 cmd = list_first_entry(&dev->execute_list, struct se_cmd, execute_list);
2014 __target_remove_from_execute_list(cmd);
e3d6f909 2015 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db 2016
a1d8b49a 2017 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 2018 cmd->transport_state |= CMD_T_BUSY;
785fdf70 2019 cmd->transport_state |= CMD_T_SENT;
c66ac9db 2020
a1d8b49a 2021 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2022
6bb35e00
CH		 2023 if (cmd->execute_cmd)
2024 error = cmd->execute_cmd(cmd);
5787cacd
CH		 2025 else {
2026 error = dev->transport->execute_cmd(cmd, cmd->t_data_sg,
2027 cmd->t_data_nents, cmd->data_direction);
2028 }
cf572a96 2029
d29a5b6a 2030 if (error != 0) {
d29a5b6a 2031 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 2032 cmd->transport_state &= ~CMD_T_BUSY;
7d680f3b 2033 cmd->transport_state &= ~CMD_T_SENT;
d29a5b6a 2034 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
7d680f3b 2035
03e98c9e 2036 transport_generic_request_failure(cmd);
c66ac9db
NB		 2037 }
2038
4d2300cc 2039 new_cmd = NULL;
c66ac9db
NB		 2040 goto check_depth;
2041
2042 return 0;
2043}
2044
c66ac9db
NB		 2045static inline u32 transport_get_sectors_6(
2046 unsigned char *cdb,
2047 struct se_cmd *cmd,
2048 int *ret)
2049{
5951146d 2050 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2051
2052 /*
2053 * Assume TYPE_DISK for non struct se_device objects.
2054 * Use 8-bit sector value.
2055 */
2056 if (!dev)
2057 goto type_disk;
2058
2059 /*
2060 * Use 24-bit allocation length for TYPE_TAPE.
2061 */
e3d6f909 2062 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2063 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2064
2065 /*
2066 * Everything else assume TYPE_DISK Sector CDB location.
9b5cd7f3
RD		 2067 * Use 8-bit sector value. SBC-3 says:
2068 *
2069 * A TRANSFER LENGTH field set to zero specifies that 256
2070 * logical blocks shall be written. Any other value
2071 * specifies the number of logical blocks that shall be
2072 * written.
c66ac9db
NB		 2073 */
2074type_disk:
9b5cd7f3 2075 return cdb[4] ? : 256;
c66ac9db
NB		 2076}
2077
2078static inline u32 transport_get_sectors_10(
2079 unsigned char *cdb,
2080 struct se_cmd *cmd,
2081 int *ret)
2082{
5951146d 2083 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2084
2085 /*
2086 * Assume TYPE_DISK for non struct se_device objects.
2087 * Use 16-bit sector value.
2088 */
2089 if (!dev)
2090 goto type_disk;
2091
2092 /*
2093 * XXX_10 is not defined in SSC, throw an exception
2094 */
e3d6f909
AG		 2095 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2096 *ret = -EINVAL;
c66ac9db
NB		 2097 return 0;
2098 }
2099
2100 /*
2101 * Everything else assume TYPE_DISK Sector CDB location.
2102 * Use 16-bit sector value.
2103 */
2104type_disk:
2105 return (u32)(cdb[7] << 8) + cdb[8];
2106}
2107
2108static inline u32 transport_get_sectors_12(
2109 unsigned char *cdb,
2110 struct se_cmd *cmd,
2111 int *ret)
2112{
5951146d 2113 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2114
2115 /*
2116 * Assume TYPE_DISK for non struct se_device objects.
2117 * Use 32-bit sector value.
2118 */
2119 if (!dev)
2120 goto type_disk;
2121
2122 /*
2123 * XXX_12 is not defined in SSC, throw an exception
2124 */
e3d6f909
AG		 2125 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2126 *ret = -EINVAL;
c66ac9db
NB		 2127 return 0;
2128 }
2129
2130 /*
2131 * Everything else assume TYPE_DISK Sector CDB location.
2132 * Use 32-bit sector value.
2133 */
2134type_disk:
2135 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2136}
2137
2138static inline u32 transport_get_sectors_16(
2139 unsigned char *cdb,
2140 struct se_cmd *cmd,
2141 int *ret)
2142{
5951146d 2143 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2144
2145 /*
2146 * Assume TYPE_DISK for non struct se_device objects.
2147 * Use 32-bit sector value.
2148 */
2149 if (!dev)
2150 goto type_disk;
2151
2152 /*
2153 * Use 24-bit allocation length for TYPE_TAPE.
2154 */
e3d6f909 2155 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2156 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2157
2158type_disk:
2159 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2160 (cdb[12] << 8) + cdb[13];
2161}
2162
2163/*
2164 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2165 */
2166static inline u32 transport_get_sectors_32(
2167 unsigned char *cdb,
2168 struct se_cmd *cmd,
2169 int *ret)
2170{
2171 /*
2172 * Assume TYPE_DISK for non struct se_device objects.
2173 * Use 32-bit sector value.
2174 */
2175 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2176 (cdb[30] << 8) + cdb[31];
2177
2178}
2179
2180static inline u32 transport_get_size(
2181 u32 sectors,
2182 unsigned char *cdb,
2183 struct se_cmd *cmd)
2184{
5951146d 2185 struct se_device *dev = cmd->se_dev;
c66ac9db 2186
e3d6f909 2187 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2188 if (cdb[1] & 1) { /* sectors */
e3d6f909 2189 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2190 } else /* bytes */
2191 return sectors;
2192 }
8b1e1244 2193
6708bb27 2194 pr_debug("Returning block_size: %u, sectors: %u == %u for"
8b1e1244
AG		 2195 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size,
2196 sectors, dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2197 dev->transport->name);
2198
e3d6f909 2199 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2200}
2201
c66ac9db
NB		 2202static void transport_xor_callback(struct se_cmd *cmd)
2203{
2204 unsigned char *buf, *addr;
ec98f782 2205 struct scatterlist *sg;
c66ac9db
NB		 2206 unsigned int offset;
2207 int i;
ec98f782 2208 int count;
c66ac9db
NB		 2209 /*
2210 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2211 *
2212 * 1) read the specified logical block(s);
2213 * 2) transfer logical blocks from the data-out buffer;
2214 * 3) XOR the logical blocks transferred from the data-out buffer with
2215 * the logical blocks read, storing the resulting XOR data in a buffer;
2216 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2217 * blocks transferred from the data-out buffer; and
2218 * 5) transfer the resulting XOR data to the data-in buffer.
2219 */
2220 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2221 if (!buf) {
2222 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2223 return;
2224 }
2225 /*
ec98f782 2226 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2227 * into the locally allocated *buf
2228 */
ec98f782
AG		 2229 sg_copy_to_buffer(cmd->t_data_sg,
2230 cmd->t_data_nents,
2231 buf,
2232 cmd->data_length);
2233
c66ac9db
NB		 2234 /*
2235 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2236 * cmd->t_mem_bidi_list
c66ac9db
NB		 2237 */
2238
2239 offset = 0;
ec98f782 2240 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
ca747d61 2241 addr = kmap_atomic(sg_page(sg));
ec98f782 2242 if (!addr)
c66ac9db
NB		 2243 goto out;
2244
ec98f782
AG		 2245 for (i = 0; i < sg->length; i++)
2246 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2247
ec98f782 2248 offset += sg->length;
ca747d61 2249 kunmap_atomic(addr);
c66ac9db 2250 }
ec98f782 2251
c66ac9db
NB		 2252out:
2253 kfree(buf);
2254}
2255
2256/*
2257 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2258 */
2259static int transport_get_sense_data(struct se_cmd *cmd)
2260{
2261 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2262 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2263 unsigned long flags;
2264 u32 offset = 0;
2265
e3d6f909
AG		 2266 WARN_ON(!cmd->se_lun);
2267
42bf829e
CH		 2268 if (!dev)
2269 return 0;
2270
a1d8b49a 2271 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2272 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2273 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2274 return 0;
2275 }
2276
cf572a96
CH		 2277 if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2278 goto out;
c66ac9db 2279
cf572a96
CH		 2280 if (!dev->transport->get_sense_buffer) {
2281 pr_err("dev->transport->get_sense_buffer is NULL\n");
2282 goto out;
2283 }
c66ac9db 2284
5787cacd 2285 sense_buffer = dev->transport->get_sense_buffer(cmd);
cf572a96 2286 if (!sense_buffer) {
5787cacd 2287 pr_err("ITT 0x%08x cmd %p: Unable to locate"
cf572a96 2288 " sense buffer for task with sense\n",
5787cacd 2289 cmd->se_tfo->get_task_tag(cmd), cmd);
cf572a96 2290 goto out;
c66ac9db 2291 }
5787cacd 2292
cf572a96
CH		 2293 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2294
2295 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
2296
2297 memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
cf572a96
CH		 2298
2299 /* Automatically padded */
2300 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
2301
2302 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2303 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
2304 return 0;
2305
785fdf70 2306out:
a1d8b49a 2307 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2308 return -1;
2309}
2310
ec98f782
AG		 2311static inline long long transport_dev_end_lba(struct se_device *dev)
2312{
2313 return dev->transport->get_blocks(dev) + 1;
2314}
2315
2316static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2317{
2318 struct se_device *dev = cmd->se_dev;
2319 u32 sectors;
2320
2321 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2322 return 0;
2323
2324 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2325
6708bb27
AG		 2326 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2327 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2328 " transport_dev_end_lba(): %llu\n",
2329 cmd->t_task_lba, sectors,
2330 transport_dev_end_lba(dev));
7abbe7f3 2331 return -EINVAL;
ec98f782
AG		 2332 }
2333
7abbe7f3 2334 return 0;
ec98f782
AG		 2335}
2336
706d5860
NB		 2337static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2338{
2339 /*
2340 * Determine if the received WRITE_SAME is used to for direct
2341 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2342 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2343 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2344 */
2345 int passthrough = (dev->transport->transport_type ==
2346 TRANSPORT_PLUGIN_PHBA_PDEV);
2347
2348 if (!passthrough) {
2349 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2350 pr_err("WRITE_SAME PBDATA and LBDATA"
2351 " bits not supported for Block Discard"
2352 " Emulation\n");
2353 return -ENOSYS;
2354 }
2355 /*
2356 * Currently for the emulated case we only accept
2357 * tpws with the UNMAP=1 bit set.
2358 */
2359 if (!(flags[0] & 0x08)) {
2360 pr_err("WRITE_SAME w/o UNMAP bit not"
2361 " supported for Block Discard Emulation\n");
2362 return -ENOSYS;
2363 }
2364 }
2365
2366 return 0;
2367}
2368
c66ac9db
NB		 2369/* transport_generic_cmd_sequencer():
2370 *
2371 * Generic Command Sequencer that should work for most DAS transport
2372 * drivers.
2373 *
a12f41f8 2374 * Called from target_setup_cmd_from_cdb() in the $FABRIC_MOD
c66ac9db
NB		 2375 * RX Thread.
2376 *
2377 * FIXME: Need to support other SCSI OPCODES where as well.
2378 */
2379static int transport_generic_cmd_sequencer(
2380 struct se_cmd *cmd,
2381 unsigned char *cdb)
2382{
5951146d 2383 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2384 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2385 int ret = 0, sector_ret = 0, passthrough;
2386 u32 sectors = 0, size = 0, pr_reg_type = 0;
2387 u16 service_action;
2388 u8 alua_ascq = 0;
2389 /*
2390 * Check for an existing UNIT ATTENTION condition
2391 */
2392 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2393 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2394 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2395 return -EINVAL;
c66ac9db
NB		 2396 }
2397 /*
2398 * Check status of Asymmetric Logical Unit Assignment port
2399 */
e3d6f909 2400 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2401 if (ret != 0) {
c66ac9db 2402 /*
25985edc 2403 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2404 * The ALUA additional sense code qualifier (ASCQ) is determined
2405 * by the ALUA primary or secondary access state..
2406 */
2407 if (ret > 0) {
6708bb27 2408 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2409 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2410 cmd->se_tfo->get_fabric_name(), alua_ascq);
8b1e1244 2411
c66ac9db
NB		 2412 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2413 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2414 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2415 return -EINVAL;
c66ac9db
NB		 2416 }
2417 goto out_invalid_cdb_field;
2418 }
2419 /*
2420 * Check status for SPC-3 Persistent Reservations
2421 */
e3d6f909
AG		 2422 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2423 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2424 cmd, cdb, pr_reg_type) != 0) {
2425 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2426 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
087a03b3 2427 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
03e98c9e
NB		 2428 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2429 return -EBUSY;
2430 }
c66ac9db
NB		 2431 /*
2432 * This means the CDB is allowed for the SCSI Initiator port
2433 * when said port is *NOT* holding the legacy SPC-2 or
2434 * SPC-3 Persistent Reservation.
2435 */
2436 }
2437
5bda90c8
CH		 2438 /*
2439 * If we operate in passthrough mode we skip most CDB emulation and
2440 * instead hand the commands down to the physical SCSI device.
2441 */
2442 passthrough =
2443 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2444
c66ac9db
NB		 2445 switch (cdb[0]) {
2446 case READ_6:
2447 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2448 if (sector_ret)
2449 goto out_unsupported_cdb;
2450 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2451 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2452 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2453 break;
2454 case READ_10:
2455 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2456 if (sector_ret)
2457 goto out_unsupported_cdb;
2458 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2459 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2460 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2461 break;
2462 case READ_12:
2463 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2464 if (sector_ret)
2465 goto out_unsupported_cdb;
2466 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2467 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2468 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2469 break;
2470 case READ_16:
2471 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2472 if (sector_ret)
2473 goto out_unsupported_cdb;
2474 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2475 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2476 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2477 break;
2478 case WRITE_6:
2479 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2480 if (sector_ret)
2481 goto out_unsupported_cdb;
2482 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2483 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2484 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2485 break;
2486 case WRITE_10:
2487 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2488 if (sector_ret)
2489 goto out_unsupported_cdb;
2490 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2491 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2492 if (cdb[1] & 0x8)
2493 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2494 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2495 break;
2496 case WRITE_12:
2497 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2498 if (sector_ret)
2499 goto out_unsupported_cdb;
2500 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2501 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2502 if (cdb[1] & 0x8)
2503 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2504 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2505 break;
2506 case WRITE_16:
2507 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2508 if (sector_ret)
2509 goto out_unsupported_cdb;
2510 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2511 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2512 if (cdb[1] & 0x8)
2513 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2514 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2515 break;
2516 case XDWRITEREAD_10:
2517 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2518 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2519 goto out_invalid_cdb_field;
2520 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2521 if (sector_ret)
2522 goto out_unsupported_cdb;
2523 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2524 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2525 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2526
5bda90c8
CH		 2527 /*
2528 * Do now allow BIDI commands for passthrough mode.
2529 */
2530 if (passthrough)
7c1c6af3 2531 goto out_unsupported_cdb;
5bda90c8 2532
c66ac9db 2533 /*
35e0e757 2534 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2535 */
2536 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2537 if (cdb[1] & 0x8)
2538 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2539 break;
2540 case VARIABLE_LENGTH_CMD:
2541 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2542 switch (service_action) {
2543 case XDWRITEREAD_32:
2544 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2545 if (sector_ret)
2546 goto out_unsupported_cdb;
2547 size = transport_get_size(sectors, cdb, cmd);
2548 /*
2549 * Use WRITE_32 and READ_32 opcodes for the emulated
2550 * XDWRITE_READ_32 logic.
2551 */
a1d8b49a 2552 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2553 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2554
5bda90c8
CH		 2555 /*
2556 * Do now allow BIDI commands for passthrough mode.
2557 */
c66ac9db 2558 if (passthrough)
7c1c6af3 2559 goto out_unsupported_cdb;
5bda90c8 2560
c66ac9db 2561 /*
35e0e757
CH		 2562 * Setup BIDI XOR callback to be run during after I/O
2563 * completion.
c66ac9db
NB		 2564 */
2565 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2566 if (cdb[1] & 0x8)
2567 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2568 break;
2569 case WRITE_SAME_32:
2570 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2571 if (sector_ret)
2572 goto out_unsupported_cdb;
dd3a5ad8 2573
6708bb27 2574 if (sectors)
12850626 2575 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2576 else {
2577 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2578 " supported\n");
2579 goto out_invalid_cdb_field;
2580 }
dd3a5ad8 2581
a1d8b49a 2582 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2583 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2584
706d5860 2585 if (target_check_write_same_discard(&cdb[10], dev) < 0)
67236c44 2586 goto out_unsupported_cdb;
5bda90c8 2587 if (!passthrough)
6bb35e00 2588 cmd->execute_cmd = target_emulate_write_same;
c66ac9db
NB		 2589 break;
2590 default:
6708bb27 2591 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2592 " 0x%04x not supported\n", service_action);
2593 goto out_unsupported_cdb;
2594 }
2595 break;
e434f1f1 2596 case MAINTENANCE_IN:
e3d6f909 2597 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2598 /* MAINTENANCE_IN from SCC-2 */
2599 /*
2600 * Check for emulated MI_REPORT_TARGET_PGS.
2601 */
e76a35d6
CH		 2602 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2603 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
6bb35e00 2604 cmd->execute_cmd =
e76a35d6 2605 target_emulate_report_target_port_groups;
c66ac9db
NB		 2606 }
2607 size = (cdb[6] << 24) | (cdb[7] << 16) |
2608 (cdb[8] << 8) | cdb[9];
2609 } else {
2610 /* GPCMD_SEND_KEY from multi media commands */
2611 size = (cdb[8] << 8) + cdb[9];
2612 }
05d1c7c0 2613 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2614 break;
2615 case MODE_SELECT:
2616 size = cdb[4];
2617 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2618 break;
2619 case MODE_SELECT_10:
2620 size = (cdb[7] << 8) + cdb[8];
2621 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2622 break;
2623 case MODE_SENSE:
2624 size = cdb[4];
05d1c7c0 2625 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2626 if (!passthrough)
6bb35e00 2627 cmd->execute_cmd = target_emulate_modesense;
c66ac9db
NB		 2628 break;
2629 case MODE_SENSE_10:
5bda90c8
CH		 2630 size = (cdb[7] << 8) + cdb[8];
2631 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2632 if (!passthrough)
6bb35e00 2633 cmd->execute_cmd = target_emulate_modesense;
5bda90c8 2634 break;
c66ac9db
NB		 2635 case GPCMD_READ_BUFFER_CAPACITY:
2636 case GPCMD_SEND_OPC:
2637 case LOG_SELECT:
2638 case LOG_SENSE:
2639 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2640 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2641 break;
2642 case READ_BLOCK_LIMITS:
2643 size = READ_BLOCK_LEN;
05d1c7c0 2644 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2645 break;
2646 case GPCMD_GET_CONFIGURATION:
2647 case GPCMD_READ_FORMAT_CAPACITIES:
2648 case GPCMD_READ_DISC_INFO:
2649 case GPCMD_READ_TRACK_RZONE_INFO:
2650 size = (cdb[7] << 8) + cdb[8];
2651 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2652 break;
2653 case PERSISTENT_RESERVE_IN:
617c0e06 2654 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
6bb35e00 2655 cmd->execute_cmd = target_scsi3_emulate_pr_in;
617c0e06
CH		 2656 size = (cdb[7] << 8) + cdb[8];
2657 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2658 break;
c66ac9db 2659 case PERSISTENT_RESERVE_OUT:
617c0e06 2660 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
6bb35e00 2661 cmd->execute_cmd = target_scsi3_emulate_pr_out;
c66ac9db 2662 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2663 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2664 break;
2665 case GPCMD_MECHANISM_STATUS:
2666 case GPCMD_READ_DVD_STRUCTURE:
2667 size = (cdb[8] << 8) + cdb[9];
2668 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2669 break;
2670 case READ_POSITION:
2671 size = READ_POSITION_LEN;
05d1c7c0 2672 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2673 break;
e434f1f1 2674 case MAINTENANCE_OUT:
e3d6f909 2675 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2676 /* MAINTENANCE_OUT from SCC-2
2677 *
2678 * Check for emulated MO_SET_TARGET_PGS.
2679 */
e76a35d6
CH		 2680 if (cdb[1] == MO_SET_TARGET_PGS &&
2681 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
6bb35e00 2682 cmd->execute_cmd =
e76a35d6 2683 target_emulate_set_target_port_groups;
c66ac9db
NB		 2684 }
2685
2686 size = (cdb[6] << 24) | (cdb[7] << 16) |
2687 (cdb[8] << 8) | cdb[9];
2688 } else {
2689 /* GPCMD_REPORT_KEY from multi media commands */
2690 size = (cdb[8] << 8) + cdb[9];
2691 }
05d1c7c0 2692 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2693 break;
2694 case INQUIRY:
2695 size = (cdb[3] << 8) + cdb[4];
2696 /*
2697 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2698 * See spc4r17 section 5.3
2699 */
5951146d 2700 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2701 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2702 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2703 if (!passthrough)
6bb35e00 2704 cmd->execute_cmd = target_emulate_inquiry;
c66ac9db
NB		 2705 break;
2706 case READ_BUFFER:
2707 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2708 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2709 break;
2710 case READ_CAPACITY:
2711 size = READ_CAP_LEN;
05d1c7c0 2712 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2713 if (!passthrough)
6bb35e00 2714 cmd->execute_cmd = target_emulate_readcapacity;
c66ac9db
NB		 2715 break;
2716 case READ_MEDIA_SERIAL_NUMBER:
2717 case SECURITY_PROTOCOL_IN:
2718 case SECURITY_PROTOCOL_OUT:
2719 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2720 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2721 break;
2722 case SERVICE_ACTION_IN:
5bda90c8
CH		 2723 switch (cmd->t_task_cdb[1] & 0x1f) {
2724 case SAI_READ_CAPACITY_16:
2725 if (!passthrough)
6bb35e00 2726 cmd->execute_cmd =
5bda90c8
CH		 2727 target_emulate_readcapacity_16;
2728 break;
2729 default:
2730 if (passthrough)
2731 break;
2732
2733 pr_err("Unsupported SA: 0x%02x\n",
2734 cmd->t_task_cdb[1] & 0x1f);
b168fe8c 2735 goto out_invalid_cdb_field;
5bda90c8
CH		 2736 }
2737 /*FALLTHROUGH*/
c66ac9db
NB		 2738 case ACCESS_CONTROL_IN:
2739 case ACCESS_CONTROL_OUT:
2740 case EXTENDED_COPY:
2741 case READ_ATTRIBUTE:
2742 case RECEIVE_COPY_RESULTS:
2743 case WRITE_ATTRIBUTE:
2744 size = (cdb[10] << 24) | (cdb[11] << 16) |
2745 (cdb[12] << 8) | cdb[13];
05d1c7c0 2746 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2747 break;
2748 case RECEIVE_DIAGNOSTIC:
2749 case SEND_DIAGNOSTIC:
2750 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2751 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2752 break;
2753/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2754#if 0
2755 case GPCMD_READ_CD:
2756 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2757 size = (2336 * sectors);
05d1c7c0 2758 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2759 break;
2760#endif
2761 case READ_TOC:
2762 size = cdb[8];
05d1c7c0 2763 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2764 break;
2765 case REQUEST_SENSE:
2766 size = cdb[4];
05d1c7c0 2767 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2768 if (!passthrough)
6bb35e00 2769 cmd->execute_cmd = target_emulate_request_sense;
c66ac9db
NB		 2770 break;
2771 case READ_ELEMENT_STATUS:
2772 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2773 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2774 break;
2775 case WRITE_BUFFER:
2776 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2777 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2778 break;
2779 case RESERVE:
2780 case RESERVE_10:
2781 /*
2782 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2783 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2784 */
2785 if (cdb[0] == RESERVE_10)
2786 size = (cdb[7] << 8) | cdb[8];
2787 else
2788 size = cmd->data_length;
2789
2790 /*
2791 * Setup the legacy emulated handler for SPC-2 and
2792 * >= SPC-3 compatible reservation handling (CRH=1)
2793 * Otherwise, we assume the underlying SCSI logic is
2794 * is running in SPC_PASSTHROUGH, and wants reservations
2795 * emulation disabled.
2796 */
e76a35d6 2797 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
6bb35e00 2798 cmd->execute_cmd = target_scsi2_reservation_reserve;
c66ac9db
NB		 2799 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2800 break;
2801 case RELEASE:
2802 case RELEASE_10:
2803 /*
2804 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2805 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2806 */
2807 if (cdb[0] == RELEASE_10)
2808 size = (cdb[7] << 8) | cdb[8];
2809 else
2810 size = cmd->data_length;
2811
e76a35d6 2812 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
6bb35e00 2813 cmd->execute_cmd = target_scsi2_reservation_release;
c66ac9db
NB		 2814 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2815 break;
2816 case SYNCHRONIZE_CACHE:
8e94b8db 2817 case SYNCHRONIZE_CACHE_16:
c66ac9db
NB		 2818 /*
2819 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2820 */
2821 if (cdb[0] == SYNCHRONIZE_CACHE) {
2822 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2823 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2824 } else {
2825 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2826 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2827 }
2828 if (sector_ret)
2829 goto out_unsupported_cdb;
2830
2831 size = transport_get_size(sectors, cdb, cmd);
2832 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2833
5bda90c8 2834 if (passthrough)
c66ac9db 2835 break;
5bda90c8 2836
c66ac9db
NB		 2837 /*
2838 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 2839 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 2840 */
7abbe7f3
NB		 2841 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2842 if (transport_cmd_get_valid_sectors(cmd) < 0)
2843 goto out_invalid_cdb_field;
2844 }
6bb35e00 2845 cmd->execute_cmd = target_emulate_synchronize_cache;
c66ac9db
NB		 2846 break;
2847 case UNMAP:
2848 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 2849 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2850 if (!passthrough)
6bb35e00 2851 cmd->execute_cmd = target_emulate_unmap;
c66ac9db
NB		 2852 break;
2853 case WRITE_SAME_16:
2854 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2855 if (sector_ret)
2856 goto out_unsupported_cdb;
dd3a5ad8 2857
6708bb27 2858 if (sectors)
12850626 2859 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2860 else {
2861 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2862 goto out_invalid_cdb_field;
2863 }
dd3a5ad8 2864
5db0753b 2865 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 2866 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2867
2868 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 2869 goto out_unsupported_cdb;
5bda90c8 2870 if (!passthrough)
6bb35e00 2871 cmd->execute_cmd = target_emulate_write_same;
706d5860
NB		 2872 break;
2873 case WRITE_SAME:
2874 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2875 if (sector_ret)
2876 goto out_unsupported_cdb;
2877
2878 if (sectors)
12850626 2879 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 2880 else {
2881 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2882 goto out_invalid_cdb_field;
c66ac9db 2883 }
706d5860
NB		 2884
2885 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 2886 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 2887 /*
2888 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2889 * of byte 1 bit 3 UNMAP instead of original reserved field
2890 */
2891 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 2892 goto out_unsupported_cdb;
5bda90c8 2893 if (!passthrough)
6bb35e00 2894 cmd->execute_cmd = target_emulate_write_same;
c66ac9db
NB		 2895 break;
2896 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 2897 case ERASE:
c66ac9db
NB		 2898 case REZERO_UNIT:
2899 case SEEK_10:
c66ac9db
NB		 2900 case SPACE:
2901 case START_STOP:
2902 case TEST_UNIT_READY:
2903 case VERIFY:
2904 case WRITE_FILEMARKS:
5bda90c8
CH		 2905 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2906 if (!passthrough)
6bb35e00 2907 cmd->execute_cmd = target_emulate_noop;
5bda90c8
CH		 2908 break;
2909 case GPCMD_CLOSE_TRACK:
2910 case INITIALIZE_ELEMENT_STATUS:
2911 case GPCMD_LOAD_UNLOAD:
2912 case GPCMD_SET_SPEED:
c66ac9db
NB		 2913 case MOVE_MEDIUM:
2914 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2915 break;
2916 case REPORT_LUNS:
6bb35e00 2917 cmd->execute_cmd = target_report_luns;
c66ac9db
NB		 2918 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2919 /*
2920 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2921 * See spc4r17 section 5.3
2922 */
5951146d 2923 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2924 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2925 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2926 break;
ed0b2144
SH		 2927 case GET_EVENT_STATUS_NOTIFICATION:
2928 size = (cdb[7] << 8) | cdb[8];
2929 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2930 break;
c66ac9db 2931 default:
6708bb27 2932 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 2933 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 2934 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 2935 goto out_unsupported_cdb;
2936 }
2937
b0d79946
SAS		 2938 if (cmd->unknown_data_length)
2939 cmd->data_length = size;
2940
c66ac9db 2941 if (size != cmd->data_length) {
6708bb27 2942 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 2943 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 2944 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 2945 cmd->data_length, size, cdb[0]);
2946
2947 cmd->cmd_spdtl = size;
2948
2949 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 2950 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 2951 " WRITE data\n");
2952 goto out_invalid_cdb_field;
2953 }
2954 /*
2955 * Reject READ_* or WRITE_* with overflow/underflow for
2956 * type SCF_SCSI_DATA_SG_IO_CDB.
2957 */
6708bb27
AG		 2958 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
2959 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 2960 " CDB on non 512-byte sector setup subsystem"
e3d6f909 2961 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 2962 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
2963 goto out_invalid_cdb_field;
2964 }
2965
2966 if (size > cmd->data_length) {
2967 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
2968 cmd->residual_count = (size - cmd->data_length);
2969 } else {
2970 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
2971 cmd->residual_count = (cmd->data_length - size);
2972 }
2973 cmd->data_length = size;
2974 }
2975
7b4deef5
NB		 2976 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
2977 if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
2978 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
2979 " big sectors %u exceeds fabric_max_sectors:"
2980 " %u\n", cdb[0], sectors,
2981 su_dev->se_dev_attrib.fabric_max_sectors);
2982 goto out_invalid_cdb_field;
2983 }
2984 if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
2985 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
2986 " big sectors %u exceeds backend hw_max_sectors:"
2987 " %u\n", cdb[0], sectors,
2988 su_dev->se_dev_attrib.hw_max_sectors);
2989 goto out_invalid_cdb_field;
2990 }
015487b8
RD		 2991 }
2992
5bda90c8 2993 /* reject any command that we don't have a handler for */
6bb35e00 2994 if (!(passthrough || cmd->execute_cmd ||
5bda90c8
CH		 2995 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2996 goto out_unsupported_cdb;
2997
c66ac9db
NB		 2998 transport_set_supported_SAM_opcode(cmd);
2999 return ret;
3000
3001out_unsupported_cdb:
3002 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3003 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3004 return -EINVAL;
c66ac9db
NB		 3005out_invalid_cdb_field:
3006 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3007 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3008 return -EINVAL;
c66ac9db
NB		 3009}
3010
c66ac9db 3011/*
35e0e757 3012 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3013 * and ordered cmds need to have their tasks added to the execution queue.
3014 */
3015static void transport_complete_task_attr(struct se_cmd *cmd)
3016{
5951146d 3017 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3018 struct se_cmd *cmd_p, *cmd_tmp;
3019 int new_active_tasks = 0;
3020
e66ecd50 3021 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3022 atomic_dec(&dev->simple_cmds);
3023 smp_mb__after_atomic_dec();
3024 dev->dev_cur_ordered_id++;
6708bb27 3025 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3026 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3027 cmd->se_ordered_id);
e66ecd50 3028 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3029 dev->dev_cur_ordered_id++;
6708bb27 3030 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3031 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3032 cmd->se_ordered_id);
e66ecd50 3033 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3034 atomic_dec(&dev->dev_ordered_sync);
3035 smp_mb__after_atomic_dec();
c66ac9db
NB		 3036
3037 dev->dev_cur_ordered_id++;
6708bb27 3038 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3039 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3040 }
3041 /*
3042 * Process all commands up to the last received
3043 * ORDERED task attribute which requires another blocking
3044 * boundary
3045 */
3046 spin_lock(&dev->delayed_cmd_lock);
3047 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3048 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3049
5951146d 3050 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3051 spin_unlock(&dev->delayed_cmd_lock);
3052
6708bb27 3053 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3054 " cmd_p: 0x%02x Task Attr: 0x%02x"
3055 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3056 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3057 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3058
cf572a96 3059 target_add_to_execute_list(cmd_p);
c66ac9db
NB		 3060 new_active_tasks++;
3061
3062 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3063 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3064 break;
3065 }
3066 spin_unlock(&dev->delayed_cmd_lock);
3067 /*
3068 * If new tasks have become active, wake up the transport thread
3069 * to do the processing of the Active tasks.
3070 */
3071 if (new_active_tasks != 0)
e3d6f909 3072 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3073}
3074
e057f533 3075static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3076{
3077 int ret = 0;
3078
e057f533
CH		 3079 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3080 transport_complete_task_attr(cmd);
3081
3082 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3083 ret = cmd->se_tfo->queue_status(cmd);
3084 if (ret)
3085 goto out;
3086 }
07bde79a
NB		 3087
3088 switch (cmd->data_direction) {
3089 case DMA_FROM_DEVICE:
3090 ret = cmd->se_tfo->queue_data_in(cmd);
3091 break;
3092 case DMA_TO_DEVICE:
ec98f782 3093 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3094 ret = cmd->se_tfo->queue_data_in(cmd);
3095 if (ret < 0)
e057f533 3096 break;
07bde79a
NB		 3097 }
3098 /* Fall through for DMA_TO_DEVICE */
3099 case DMA_NONE:
3100 ret = cmd->se_tfo->queue_status(cmd);
3101 break;
3102 default:
3103 break;
3104 }
3105
e057f533
CH		 3106out:
3107 if (ret < 0) {
3108 transport_handle_queue_full(cmd, cmd->se_dev);
3109 return;
3110 }
3111 transport_lun_remove_cmd(cmd);
3112 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3113}
3114
3115static void transport_handle_queue_full(
3116 struct se_cmd *cmd,
e057f533 3117 struct se_device *dev)
07bde79a
NB		 3118{
3119 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3120 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3121 atomic_inc(&dev->dev_qf_count);
3122 smp_mb__after_atomic_inc();
3123 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3124
3125 schedule_work(&cmd->se_dev->qf_work_queue);
3126}
3127
35e0e757 3128static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3129{
35e0e757 3130 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3131 int reason = 0, ret;
35e0e757 3132
c66ac9db
NB		 3133 /*
3134 * Check if we need to move delayed/dormant tasks from cmds on the
3135 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3136 * Attribute.
3137 */
5951146d 3138 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3139 transport_complete_task_attr(cmd);
07bde79a
NB		 3140 /*
3141 * Check to schedule QUEUE_FULL work, or execute an existing
3142 * cmd->transport_qf_callback()
3143 */
3144 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3145 schedule_work(&cmd->se_dev->qf_work_queue);
3146
c66ac9db
NB		 3147 /*
3148 * Check if we need to retrieve a sense buffer from
3149 * the struct se_cmd in question.
3150 */
3151 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3152 if (transport_get_sense_data(cmd) < 0)
3153 reason = TCM_NON_EXISTENT_LUN;
3154
c66ac9db 3155 if (cmd->scsi_status) {
07bde79a 3156 ret = transport_send_check_condition_and_sense(
c66ac9db 3157 cmd, reason, 1);
f147abb4 3158 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3159 goto queue_full;
3160
c66ac9db
NB		 3161 transport_lun_remove_cmd(cmd);
3162 transport_cmd_check_stop_to_fabric(cmd);
3163 return;
3164 }
3165 }
3166 /*
25985edc 3167 * Check for a callback, used by amongst other things
c66ac9db
NB		 3168 * XDWRITE_READ_10 emulation.
3169 */
3170 if (cmd->transport_complete_callback)
3171 cmd->transport_complete_callback(cmd);
3172
3173 switch (cmd->data_direction) {
3174 case DMA_FROM_DEVICE:
3175 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3176 if (cmd->se_lun->lun_sep) {
3177 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3178 cmd->data_length;
3179 }
3180 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3181
07bde79a 3182 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3183 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3184 goto queue_full;
c66ac9db
NB		 3185 break;
3186 case DMA_TO_DEVICE:
3187 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3188 if (cmd->se_lun->lun_sep) {
3189 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3190 cmd->data_length;
3191 }
3192 spin_unlock(&cmd->se_lun->lun_sep_lock);
3193 /*
3194 * Check if we need to send READ payload for BIDI-COMMAND
3195 */
ec98f782 3196 if (cmd->t_bidi_data_sg) {
c66ac9db 3197 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3198 if (cmd->se_lun->lun_sep) {
3199 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3200 cmd->data_length;
3201 }
3202 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3203 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3204 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3205 goto queue_full;
c66ac9db
NB		 3206 break;
3207 }
3208 /* Fall through for DMA_TO_DEVICE */
3209 case DMA_NONE:
07bde79a 3210 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3211 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3212 goto queue_full;
c66ac9db
NB		 3213 break;
3214 default:
3215 break;
3216 }
3217
3218 transport_lun_remove_cmd(cmd);
3219 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3220 return;
3221
3222queue_full:
6708bb27 3223 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3224 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3225 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3226 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3227}
3228
6708bb27 3229static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3230{
ec98f782 3231 struct scatterlist *sg;
ec98f782 3232 int count;
c66ac9db 3233
6708bb27
AG		 3234 for_each_sg(sgl, sg, nents, count)
3235 __free_page(sg_page(sg));
c66ac9db 3236
6708bb27
AG		 3237 kfree(sgl);
3238}
c66ac9db 3239
6708bb27
AG		 3240static inline void transport_free_pages(struct se_cmd *cmd)
3241{
3242 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3243 return;
3244
3245 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3246 cmd->t_data_sg = NULL;
3247 cmd->t_data_nents = 0;
c66ac9db 3248
6708bb27 3249 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3250 cmd->t_bidi_data_sg = NULL;
3251 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3252}
3253
e26d99ae
CH		 3254/**
3255 * transport_release_cmd - free a command
3256 * @cmd: command to free
3257 *
3258 * This routine unconditionally frees a command, and reference counting
3259 * or list removal must be done in the caller.
3260 */
3261static void transport_release_cmd(struct se_cmd *cmd)
3262{
3263 BUG_ON(!cmd->se_tfo);
3264
c8e31f26 3265 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 3266 core_tmr_release_req(cmd->se_tmr_req);
3267 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3268 kfree(cmd->t_task_cdb);
3269 /*
7481deb4
NB		 3270 * If this cmd has been setup with target_get_sess_cmd(), drop
3271 * the kref and call ->release_cmd() in kref callback.
e26d99ae 3272 */
7481deb4
NB		 3273 if (cmd->check_release != 0) {
3274 target_put_sess_cmd(cmd->se_sess, cmd);
3275 return;
3276 }
e26d99ae
CH		 3277 cmd->se_tfo->release_cmd(cmd);
3278}
3279
d3df7825
CH		 3280/**
3281 * transport_put_cmd - release a reference to a command
3282 * @cmd: command to release
3283 *
3284 * This routine releases our reference to the command and frees it if possible.
3285 */
39c05f32 3286static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3287{
3288 unsigned long flags;
c66ac9db 3289
a1d8b49a 3290 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3291 if (atomic_read(&cmd->t_fe_count)) {
3292 if (!atomic_dec_and_test(&cmd->t_fe_count))
3293 goto out_busy;
3294 }
3295
7d680f3b
CH		 3296 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3297 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 3298 target_remove_from_state_list(cmd);
c66ac9db 3299 }
a1d8b49a 3300 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3301
c66ac9db 3302 transport_free_pages(cmd);
31afc39c 3303 transport_release_cmd(cmd);
39c05f32 3304 return;
4911e3cc
CH		 3305out_busy:
3306 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3307}
3308
c66ac9db 3309/*
ec98f782
AG		 3310 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3311 * allocating in the core.
c66ac9db
NB		 3312 * @cmd: Associated se_cmd descriptor
3313 * @mem: SGL style memory for TCM WRITE / READ
3314 * @sg_mem_num: Number of SGL elements
3315 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3316 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3317 *
3318 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3319 * of parameters.
3320 */
3321int transport_generic_map_mem_to_cmd(
3322 struct se_cmd *cmd,
5951146d
AG		 3323 struct scatterlist *sgl,
3324 u32 sgl_count,
3325 struct scatterlist *sgl_bidi,
3326 u32 sgl_bidi_count)
c66ac9db 3327{
5951146d 3328 if (!sgl || !sgl_count)
c66ac9db 3329 return 0;
c66ac9db 3330
c66ac9db
NB		 3331 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3332 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
fef58a60
NB		 3333 /*
3334 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3335 * scatterlists already have been set to follow what the fabric
3336 * passes for the original expected data transfer length.
3337 */
3338 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3339 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3340 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3341 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3342 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3343 return -EINVAL;
3344 }
c66ac9db 3345
ec98f782
AG		 3346 cmd->t_data_sg = sgl;
3347 cmd->t_data_nents = sgl_count;
c66ac9db 3348
ec98f782
AG		 3349 if (sgl_bidi && sgl_bidi_count) {
3350 cmd->t_bidi_data_sg = sgl_bidi;
3351 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3352 }
3353 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3354 }
3355
3356 return 0;
3357}
3358EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3359
4949314c 3360void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3361{
ec98f782 3362 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 3363 struct page **pages;
3364 int i;
05d1c7c0 3365
ec98f782 3366 BUG_ON(!sg);
05d1c7c0 3367 /*
ec98f782
AG		 3368 * We need to take into account a possible offset here for fabrics like
3369 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3370 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3371 */
4949314c
AG		 3372 if (!cmd->t_data_nents)
3373 return NULL;
3374 else if (cmd->t_data_nents == 1)
3375 return kmap(sg_page(sg)) + sg->offset;
3376
3377 /* >1 page. use vmap */
3378 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3379 if (!pages)
3380 return NULL;
3381
3382 /* convert sg[] to pages[] */
3383 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3384 pages[i] = sg_page(sg);
3385 }
3386
3387 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
3388 kfree(pages);
3389 if (!cmd->t_data_vmap)
3390 return NULL;
3391
3392 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 3393}
4949314c 3394EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 3395
4949314c 3396void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3397{
a1edf9cf 3398 if (!cmd->t_data_nents) {
4949314c 3399 return;
a1edf9cf 3400 } else if (cmd->t_data_nents == 1) {
4949314c 3401 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 3402 return;
3403 }
4949314c
AG		 3404
3405 vunmap(cmd->t_data_vmap);
3406 cmd->t_data_vmap = NULL;
05d1c7c0 3407}
4949314c 3408EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 3409
c66ac9db 3410static int
05d1c7c0 3411transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3412{
ec98f782
AG		 3413 u32 length = cmd->data_length;
3414 unsigned int nents;
3415 struct page *page;
9db9da33 3416 gfp_t zero_flag;
ec98f782 3417 int i = 0;
c66ac9db 3418
ec98f782
AG		 3419 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3420 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3421 if (!cmd->t_data_sg)
3422 return -ENOMEM;
c66ac9db 3423
ec98f782
AG		 3424 cmd->t_data_nents = nents;
3425 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3426
9db9da33 3427 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3428
ec98f782
AG		 3429 while (length) {
3430 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 3431 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 3432 if (!page)
3433 goto out;
c66ac9db 3434
ec98f782
AG		 3435 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3436 length -= page_len;
3437 i++;
c66ac9db 3438 }
c66ac9db 3439 return 0;
c66ac9db 3440
ec98f782
AG		 3441out:
3442 while (i >= 0) {
3443 __free_page(sg_page(&cmd->t_data_sg[i]));
3444 i--;
c66ac9db 3445 }
ec98f782
AG		 3446 kfree(cmd->t_data_sg);
3447 cmd->t_data_sg = NULL;
3448 return -ENOMEM;
c66ac9db
NB		 3449}
3450
da0f7619 3451/*
b16a35b0
AG		 3452 * Allocate any required resources to execute the command. For writes we
3453 * might not have the payload yet, so notify the fabric via a call to
3454 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 3455 */
a1d8b49a 3456int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3457{
da0f7619 3458 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3459 int ret = 0;
3460
3461 /*
3462 * Determine is the TCM fabric module has already allocated physical
3463 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3464 * beforehand.
c66ac9db 3465 */
ec98f782
AG		 3466 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3467 cmd->data_length) {
05d1c7c0 3468 ret = transport_generic_get_mem(cmd);
c66ac9db 3469 if (ret < 0)
03e98c9e 3470 goto out_fail;
c66ac9db 3471 }
da0f7619 3472
4101f0a8
CH		 3473 /* Workaround for handling zero-length control CDBs */
3474 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3475 !cmd->data_length) {
7d680f3b 3476 spin_lock_irq(&cmd->t_state_lock);
410f6702 3477 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 3478 cmd->transport_state |= CMD_T_ACTIVE;
3479 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 3480
3481 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3482 u8 ua_asc = 0, ua_ascq = 0;
3483
3484 core_scsi3_ua_clear_for_request_sense(cmd,
3485 &ua_asc, &ua_ascq);
3486 }
3487
410f6702
RD		 3488 INIT_WORK(&cmd->work, target_complete_ok_work);
3489 queue_work(target_completion_wq, &cmd->work);
3490 return 0;
3491 }
da0f7619 3492
4101f0a8
CH		 3493 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3494 struct se_dev_attrib *attr = &dev->se_sub_dev->se_dev_attrib;
3495
3496 if (transport_cmd_get_valid_sectors(cmd) < 0)
3497 return -EINVAL;
3498
3499 BUG_ON(cmd->data_length % attr->block_size);
3500 BUG_ON(DIV_ROUND_UP(cmd->data_length, attr->block_size) >
3501 attr->max_sectors);
da0f7619
CH		 3502 }
3503
4101f0a8 3504 atomic_inc(&cmd->t_fe_count);
4101f0a8 3505
c66ac9db 3506 /*
5787cacd
CH		 3507 * For WRITEs, let the fabric know its buffer is ready.
3508 *
3509 * The command will be added to the execution queue after its write
3510 * data has arrived.
c66ac9db
NB		 3511 */
3512 if (cmd->data_direction == DMA_TO_DEVICE) {
cf572a96 3513 target_add_to_state_list(cmd);
c66ac9db
NB		 3514 return transport_generic_write_pending(cmd);
3515 }
3516 /*
5787cacd 3517 * Everything else but a WRITE, add the command to the execution queue.
c66ac9db
NB		 3518 */
3519 transport_execute_tasks(cmd);
3520 return 0;
da0f7619
CH		 3521
3522out_fail:
3523 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3524 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3525 return -EINVAL;
c66ac9db 3526}
a1d8b49a 3527EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3528
3529/* transport_generic_process_write():
3530 *
3531 *
3532 */
3533void transport_generic_process_write(struct se_cmd *cmd)
3534{
c66ac9db
NB		 3535 transport_execute_tasks(cmd);
3536}
3537EXPORT_SYMBOL(transport_generic_process_write);
3538
e057f533 3539static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3540{
f147abb4
NB		 3541 int ret;
3542
3543 ret = cmd->se_tfo->write_pending(cmd);
3544 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3545 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3546 cmd);
3547 transport_handle_queue_full(cmd, cmd->se_dev);
3548 }
07bde79a
NB		 3549}
3550
c66ac9db
NB		 3551static int transport_generic_write_pending(struct se_cmd *cmd)
3552{
3553 unsigned long flags;
3554 int ret;
3555
a1d8b49a 3556 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3557 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3558 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3559
c66ac9db
NB		 3560 /*
3561 * Clear the se_cmd for WRITE_PENDING status in order to set
7d680f3b
CH		 3562 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3563 * from HW target mode interrupt code. This is safe to be called
3564 * with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3565 * because the se_cmd->se_lun pointer is not being cleared.
3566 */
3567 transport_cmd_check_stop(cmd, 1, 0);
3568
3569 /*
3570 * Call the fabric write_pending function here to let the
3571 * frontend know that WRITE buffers are ready.
3572 */
e3d6f909 3573 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3574 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3575 goto queue_full;
3576 else if (ret < 0)
c66ac9db
NB		 3577 return ret;
3578
03e98c9e 3579 return 1;
07bde79a
NB		 3580
3581queue_full:
6708bb27 3582 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3583 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3584 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3585 return 0;
c66ac9db
NB		 3586}
3587
39c05f32 3588void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3589{
d14921d6 3590 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 3591 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 3592 transport_wait_for_tasks(cmd);
3593
35462975 3594 transport_release_cmd(cmd);
d14921d6
NB		 3595 } else {
3596 if (wait_for_tasks)
3597 transport_wait_for_tasks(cmd);
3598
c66ac9db
NB		 3599 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3600
82f1c8a4 3601 if (cmd->se_lun)
c66ac9db 3602 transport_lun_remove_cmd(cmd);
c66ac9db 3603
39c05f32 3604 transport_put_cmd(cmd);
c66ac9db
NB		 3605 }
3606}
3607EXPORT_SYMBOL(transport_generic_free_cmd);
3608
a17f091d
NB		 3609/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3610 * @se_sess: session to reference
3611 * @se_cmd: command descriptor to add
a6360785 3612 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 3613 */
a6360785
NB		 3614void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3615 bool ack_kref)
a17f091d
NB		 3616{
3617 unsigned long flags;
3618
7481deb4 3619 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 3620 /*
3621 * Add a second kref if the fabric caller is expecting to handle
3622 * fabric acknowledgement that requires two target_put_sess_cmd()
3623 * invocations before se_cmd descriptor release.
3624 */
86715569 3625 if (ack_kref == true) {
a6360785 3626 kref_get(&se_cmd->cmd_kref);
86715569
NB		 3627 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
3628 }
7481deb4 3629
a17f091d
NB		 3630 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3631 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3632 se_cmd->check_release = 1;
3633 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3634}
3635EXPORT_SYMBOL(target_get_sess_cmd);
3636
7481deb4 3637static void target_release_cmd_kref(struct kref *kref)
a17f091d 3638{
7481deb4
NB		 3639 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3640 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 3641 unsigned long flags;
3642
3643 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3644 if (list_empty(&se_cmd->se_cmd_list)) {
3645 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 3646 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 3647 return;
a17f091d 3648 }
a17f091d
NB		 3649 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3650 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3651 complete(&se_cmd->cmd_wait_comp);
7481deb4 3652 return;
a17f091d
NB		 3653 }
3654 list_del(&se_cmd->se_cmd_list);
3655 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3656
7481deb4
NB		 3657 se_cmd->se_tfo->release_cmd(se_cmd);
3658}
3659
3660/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
3661 * @se_sess: session to reference
3662 * @se_cmd: command descriptor to drop
3663 */
3664int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3665{
3666 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 3667}
3668EXPORT_SYMBOL(target_put_sess_cmd);
3669
3670/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3671 * @se_sess: session to split
3672 */
3673void target_splice_sess_cmd_list(struct se_session *se_sess)
3674{
3675 struct se_cmd *se_cmd;
3676 unsigned long flags;
3677
3678 WARN_ON(!list_empty(&se_sess->sess_wait_list));
3679 INIT_LIST_HEAD(&se_sess->sess_wait_list);
3680
3681 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3682 se_sess->sess_tearing_down = 1;
3683
3684 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3685
3686 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3687 se_cmd->cmd_wait_set = 1;
3688
3689 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3690}
3691EXPORT_SYMBOL(target_splice_sess_cmd_list);
3692
3693/* target_wait_for_sess_cmds - Wait for outstanding descriptors
3694 * @se_sess: session to wait for active I/O
3695 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3696 */
3697void target_wait_for_sess_cmds(
3698 struct se_session *se_sess,
3699 int wait_for_tasks)
3700{
3701 struct se_cmd *se_cmd, *tmp_cmd;
3702 bool rc = false;
3703
3704 list_for_each_entry_safe(se_cmd, tmp_cmd,
3705 &se_sess->sess_wait_list, se_cmd_list) {
3706 list_del(&se_cmd->se_cmd_list);
3707
3708 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3709 " %d\n", se_cmd, se_cmd->t_state,
3710 se_cmd->se_tfo->get_cmd_state(se_cmd));
3711
3712 if (wait_for_tasks) {
3713 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3714 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3715 se_cmd->se_tfo->get_cmd_state(se_cmd));
3716
3717 rc = transport_wait_for_tasks(se_cmd);
3718
3719 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3720 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3721 se_cmd->se_tfo->get_cmd_state(se_cmd));
3722 }
3723
3724 if (!rc) {
3725 wait_for_completion(&se_cmd->cmd_wait_comp);
3726 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
3727 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3728 se_cmd->se_tfo->get_cmd_state(se_cmd));
3729 }
3730
3731 se_cmd->se_tfo->release_cmd(se_cmd);
3732 }
3733}
3734EXPORT_SYMBOL(target_wait_for_sess_cmds);
3735
c66ac9db
NB		 3736/* transport_lun_wait_for_tasks():
3737 *
3738 * Called from ConfigFS context to stop the passed struct se_cmd to allow
3739 * an struct se_lun to be successfully shutdown.
3740 */
3741static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
3742{
3743 unsigned long flags;
cf572a96
CH		 3744 int ret = 0;
3745
c66ac9db
NB		 3746 /*
3747 * If the frontend has already requested this struct se_cmd to
3748 * be stopped, we can safely ignore this struct se_cmd.
3749 */
a1d8b49a 3750 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 3751 if (cmd->transport_state & CMD_T_STOP) {
3752 cmd->transport_state &= ~CMD_T_LUN_STOP;
3753
3754 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
3755 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 3756 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3757 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 3758 return -EPERM;
c66ac9db 3759 }
7d680f3b 3760 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 3761 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3762
5951146d 3763 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 3764
cf572a96
CH		 3765 // XXX: audit task_flags checks.
3766 spin_lock_irqsave(&cmd->t_state_lock, flags);
3767 if ((cmd->transport_state & CMD_T_BUSY) &&
3768 (cmd->transport_state & CMD_T_SENT)) {
3769 if (!target_stop_cmd(cmd, &flags))
3770 ret++;
23019170 3771 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96
CH		 3772 } else {
3773 spin_unlock_irqrestore(&cmd->t_state_lock,
3774 flags);
3775 target_remove_from_execute_list(cmd);
3776 }
c66ac9db 3777
785fdf70
CH		 3778 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
3779 " %d\n", cmd, ret);
c66ac9db 3780 if (!ret) {
6708bb27 3781 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 3782 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 3783 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 3784 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 3785 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3786 }
3df8d40b 3787 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 3788
3789 return 0;
3790}
3791
c66ac9db
NB		 3792static void __transport_clear_lun_from_sessions(struct se_lun *lun)
3793{
3794 struct se_cmd *cmd = NULL;
3795 unsigned long lun_flags, cmd_flags;
3796 /*
3797 * Do exception processing and return CHECK_CONDITION status to the
3798 * Initiator Port.
3799 */
3800 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 3801 while (!list_empty(&lun->lun_cmd_list)) {
3802 cmd = list_first_entry(&lun->lun_cmd_list,
3803 struct se_cmd, se_lun_node);
3d26fea0 3804 list_del_init(&cmd->se_lun_node);
5951146d 3805
c66ac9db
NB		 3806 /*
3807 * This will notify iscsi_target_transport.c:
3808 * transport_cmd_check_stop() that a LUN shutdown is in
3809 * progress for the iscsi_cmd_t.
3810 */
a1d8b49a 3811 spin_lock(&cmd->t_state_lock);
6708bb27 3812 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 3813 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 3814 cmd->se_lun->unpacked_lun,
3815 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 3816 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 3817 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 3818
3819 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3820
6708bb27
AG		 3821 if (!cmd->se_lun) {
3822 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 3823 cmd->se_tfo->get_task_tag(cmd),
3824 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 3825 BUG();
3826 }
3827 /*
3828 * If the Storage engine still owns the iscsi_cmd_t, determine
3829 * and/or stop its context.
3830 */
6708bb27 3831 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 3832 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
3833 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3834
e3d6f909 3835 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 3836 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3837 continue;
3838 }
3839
6708bb27 3840 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 3841 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 3842 cmd->se_lun->unpacked_lun,
3843 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3844
a1d8b49a 3845 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 3846 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 3847 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 3848 goto check_cond;
3849 }
7d680f3b 3850 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 3851 target_remove_from_state_list(cmd);
a1d8b49a 3852 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 3853
c66ac9db
NB		 3854 /*
3855 * The Storage engine stopped this struct se_cmd before it was
3856 * send to the fabric frontend for delivery back to the
3857 * Initiator Node. Return this SCSI CDB back with an
3858 * CHECK_CONDITION status.
3859 */
3860check_cond:
3861 transport_send_check_condition_and_sense(cmd,
3862 TCM_NON_EXISTENT_LUN, 0);
3863 /*
3864 * If the fabric frontend is waiting for this iscsi_cmd_t to
3865 * be released, notify the waiting thread now that LU has
3866 * finished accessing it.
3867 */
a1d8b49a 3868 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 3869 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 3870 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 3871 " struct se_cmd: %p ITT: 0x%08x\n",
3872 lun->unpacked_lun,
e3d6f909 3873 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3874
a1d8b49a 3875 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3876 cmd_flags);
3877 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 3878 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 3879 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3880 continue;
3881 }
6708bb27 3882 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 3883 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3884
a1d8b49a 3885 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 3886 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3887 }
3888 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3889}
3890
3891static int transport_clear_lun_thread(void *p)
3892{
8359cf43 3893 struct se_lun *lun = p;
c66ac9db
NB		 3894
3895 __transport_clear_lun_from_sessions(lun);
3896 complete(&lun->lun_shutdown_comp);
3897
3898 return 0;
3899}
3900
3901int transport_clear_lun_from_sessions(struct se_lun *lun)
3902{
3903 struct task_struct *kt;
3904
5951146d 3905 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 3906 "tcm_cl_%u", lun->unpacked_lun);
3907 if (IS_ERR(kt)) {
6708bb27 3908 pr_err("Unable to start clear_lun thread\n");
e3d6f909 3909 return PTR_ERR(kt);
c66ac9db
NB		 3910 }
3911 wait_for_completion(&lun->lun_shutdown_comp);
3912
3913 return 0;
3914}
3915
d14921d6
NB		 3916/**
3917 * transport_wait_for_tasks - wait for completion to occur
3918 * @cmd: command to wait
c66ac9db 3919 *
d14921d6
NB		 3920 * Called from frontend fabric context to wait for storage engine
3921 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 3922 */
a17f091d 3923bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 3924{
3925 unsigned long flags;
3926
a1d8b49a 3927 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 3928 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
3929 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 3930 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 3931 return false;
d14921d6
NB		 3932 }
3933 /*
3934 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
3935 * has been set in transport_set_supported_SAM_opcode().
3936 */
c8e31f26
AG		 3937 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
3938 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 3939 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 3940 return false;
d14921d6 3941 }
c66ac9db
NB		 3942 /*
3943 * If we are already stopped due to an external event (ie: LUN shutdown)
3944 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 3945 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 3946 * transport_clear_lun_from_sessions() once the ConfigFS context caller
3947 * has completed its operation on the struct se_cmd.
3948 */
7d680f3b 3949 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 3950 pr_debug("wait_for_tasks: Stopping"
e3d6f909 3951 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 3952 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 3953 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 3954 /*
3955 * There is a special case for WRITES where a FE exception +
3956 * LUN shutdown means ConfigFS context is still sleeping on
3957 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
3958 * We go ahead and up transport_lun_stop_comp just to be sure
3959 * here.
3960 */
a1d8b49a
AG		 3961 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3962 complete(&cmd->transport_lun_stop_comp);
3963 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
3964 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3965
cf572a96 3966 target_remove_from_state_list(cmd);
c66ac9db
NB		 3967 /*
3968 * At this point, the frontend who was the originator of this
3969 * struct se_cmd, now owns the structure and can be released through
3970 * normal means below.
3971 */
6708bb27 3972 pr_debug("wait_for_tasks: Stopped"
e3d6f909 3973 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 3974 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 3975 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3976
7d680f3b 3977 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 3978 }
7d680f3b 3979
3d28934a 3980 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 3981 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 3982 return false;
d14921d6 3983 }
c66ac9db 3984
7d680f3b 3985 cmd->transport_state |= CMD_T_STOP;
c66ac9db 3986
6708bb27 3987 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 3988 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 3989 cmd, cmd->se_tfo->get_task_tag(cmd),
3990 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 3991
a1d8b49a 3992 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3993
5951146d 3994 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 3995
a1d8b49a 3996 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 3997
a1d8b49a 3998 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 3999 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 4000
6708bb27 4001 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4002 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4003 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4004
d14921d6 4005 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4006
4007 return true;
c66ac9db 4008}
d14921d6 4009EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4010
4011static int transport_get_sense_codes(
4012 struct se_cmd *cmd,
4013 u8 *asc,
4014 u8 *ascq)
4015{
4016 *asc = cmd->scsi_asc;
4017 *ascq = cmd->scsi_ascq;
4018
4019 return 0;
4020}
4021
4022static int transport_set_sense_codes(
4023 struct se_cmd *cmd,
4024 u8 asc,
4025 u8 ascq)
4026{
4027 cmd->scsi_asc = asc;
4028 cmd->scsi_ascq = ascq;
4029
4030 return 0;
4031}
4032
4033int transport_send_check_condition_and_sense(
4034 struct se_cmd *cmd,
4035 u8 reason,
4036 int from_transport)
4037{
4038 unsigned char *buffer = cmd->sense_buffer;
4039 unsigned long flags;
4040 int offset;
4041 u8 asc = 0, ascq = 0;
4042
a1d8b49a 4043 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4044 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4045 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4046 return 0;
4047 }
4048 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4049 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4050
4051 if (!reason && from_transport)
4052 goto after_reason;
4053
4054 if (!from_transport)
4055 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4056 /*
4057 * Data Segment and SenseLength of the fabric response PDU.
4058 *
4059 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4060 * from include/scsi/scsi_cmnd.h
4061 */
e3d6f909 4062 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4063 TRANSPORT_SENSE_BUFFER);
4064 /*
4065 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4066 * SENSE KEY values from include/scsi/scsi.h
4067 */
4068 switch (reason) {
4069 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4070 /* CURRENT ERROR */
4071 buffer[offset] = 0x70;
895f3022 4072 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 4073 /* ILLEGAL REQUEST */
4074 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4075 /* LOGICAL UNIT NOT SUPPORTED */
4076 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4077 break;
c66ac9db
NB		 4078 case TCM_UNSUPPORTED_SCSI_OPCODE:
4079 case TCM_SECTOR_COUNT_TOO_MANY:
4080 /* CURRENT ERROR */
4081 buffer[offset] = 0x70;
895f3022 4082 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4083 /* ILLEGAL REQUEST */
4084 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4085 /* INVALID COMMAND OPERATION CODE */
4086 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4087 break;
4088 case TCM_UNKNOWN_MODE_PAGE:
4089 /* CURRENT ERROR */
4090 buffer[offset] = 0x70;
895f3022 4091 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4092 /* ILLEGAL REQUEST */
4093 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4094 /* INVALID FIELD IN CDB */
4095 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4096 break;
4097 case TCM_CHECK_CONDITION_ABORT_CMD:
4098 /* CURRENT ERROR */
4099 buffer[offset] = 0x70;
895f3022 4100 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4101 /* ABORTED COMMAND */
4102 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4103 /* BUS DEVICE RESET FUNCTION OCCURRED */
4104 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4105 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4106 break;
4107 case TCM_INCORRECT_AMOUNT_OF_DATA:
4108 /* CURRENT ERROR */
4109 buffer[offset] = 0x70;
895f3022 4110 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4111 /* ABORTED COMMAND */
4112 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4113 /* WRITE ERROR */
4114 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4115 /* NOT ENOUGH UNSOLICITED DATA */
4116 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4117 break;
4118 case TCM_INVALID_CDB_FIELD:
4119 /* CURRENT ERROR */
4120 buffer[offset] = 0x70;
895f3022 4121 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4122 /* ILLEGAL REQUEST */
4123 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4124 /* INVALID FIELD IN CDB */
4125 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4126 break;
4127 case TCM_INVALID_PARAMETER_LIST:
4128 /* CURRENT ERROR */
4129 buffer[offset] = 0x70;
895f3022 4130 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4131 /* ILLEGAL REQUEST */
4132 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4133 /* INVALID FIELD IN PARAMETER LIST */
4134 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4135 break;
4136 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4137 /* CURRENT ERROR */
4138 buffer[offset] = 0x70;
895f3022 4139 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4140 /* ABORTED COMMAND */
4141 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4142 /* WRITE ERROR */
4143 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4144 /* UNEXPECTED_UNSOLICITED_DATA */
4145 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4146 break;
4147 case TCM_SERVICE_CRC_ERROR:
4148 /* CURRENT ERROR */
4149 buffer[offset] = 0x70;
895f3022 4150 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4151 /* ABORTED COMMAND */
4152 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4153 /* PROTOCOL SERVICE CRC ERROR */
4154 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4155 /* N/A */
4156 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4157 break;
4158 case TCM_SNACK_REJECTED:
4159 /* CURRENT ERROR */
4160 buffer[offset] = 0x70;
895f3022 4161 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4162 /* ABORTED COMMAND */
4163 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4164 /* READ ERROR */
4165 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4166 /* FAILED RETRANSMISSION REQUEST */
4167 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4168 break;
4169 case TCM_WRITE_PROTECTED:
4170 /* CURRENT ERROR */
4171 buffer[offset] = 0x70;
895f3022 4172 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4173 /* DATA PROTECT */
4174 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4175 /* WRITE PROTECTED */
4176 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4177 break;
4178 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4179 /* CURRENT ERROR */
4180 buffer[offset] = 0x70;
895f3022 4181 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4182 /* UNIT ATTENTION */
4183 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4184 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4185 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4186 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4187 break;
4188 case TCM_CHECK_CONDITION_NOT_READY:
4189 /* CURRENT ERROR */
4190 buffer[offset] = 0x70;
895f3022 4191 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4192 /* Not Ready */
4193 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4194 transport_get_sense_codes(cmd, &asc, &ascq);
4195 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4196 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4197 break;
4198 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4199 default:
4200 /* CURRENT ERROR */
4201 buffer[offset] = 0x70;
895f3022 4202 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4203 /* ILLEGAL REQUEST */
4204 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4205 /* LOGICAL UNIT COMMUNICATION FAILURE */
4206 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4207 break;
4208 }
4209 /*
4210 * This code uses linux/include/scsi/scsi.h SAM status codes!
4211 */
4212 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4213 /*
4214 * Automatically padded, this value is encoded in the fabric's
4215 * data_length response PDU containing the SCSI defined sense data.
4216 */
4217 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4218
4219after_reason:
07bde79a 4220 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4221}
4222EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4223
4224int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4225{
4226 int ret = 0;
4227
7d680f3b 4228 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 4229 if (!send_status ||
c66ac9db
NB		 4230 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4231 return 1;
8b1e1244 4232
6708bb27 4233 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4234 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4235 cmd->t_task_cdb[0],
e3d6f909 4236 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 4237
c66ac9db 4238 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4239 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4240 ret = 1;
4241 }
4242 return ret;
4243}
4244EXPORT_SYMBOL(transport_check_aborted_status);
4245
4246void transport_send_task_abort(struct se_cmd *cmd)
4247{
c252f003
NB		 4248 unsigned long flags;
4249
4250 spin_lock_irqsave(&cmd->t_state_lock, flags);
4251 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4252 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4253 return;
4254 }
4255 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4256
c66ac9db
NB		 4257 /*
4258 * If there are still expected incoming fabric WRITEs, we wait
4259 * until until they have completed before sending a TASK_ABORTED
4260 * response. This response with TASK_ABORTED status will be
4261 * queued back to fabric module by transport_check_aborted_status().
4262 */
4263 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4264 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 4265 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 4266 smp_mb__after_atomic_inc();
c66ac9db
NB		 4267 }
4268 }
4269 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 4270
6708bb27 4271 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4272 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4273 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 4274
e3d6f909 4275 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4276}
4277
e26d99ae 4278static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4279{
5951146d 4280 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4281 struct se_tmr_req *tmr = cmd->se_tmr_req;
4282 int ret;
4283
4284 switch (tmr->function) {
5c6cd613 4285 case TMR_ABORT_TASK:
3d28934a 4286 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 4287 break;
5c6cd613
NB		 4288 case TMR_ABORT_TASK_SET:
4289 case TMR_CLEAR_ACA:
4290 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4291 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4292 break;
5c6cd613 4293 case TMR_LUN_RESET:
c66ac9db
NB		 4294 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4295 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4296 TMR_FUNCTION_REJECTED;
4297 break;
5c6cd613 4298 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4299 tmr->response = TMR_FUNCTION_REJECTED;
4300 break;
5c6cd613 4301 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4302 tmr->response = TMR_FUNCTION_REJECTED;
4303 break;
c66ac9db 4304 default:
6708bb27 4305 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4306 tmr->function);
4307 tmr->response = TMR_FUNCTION_REJECTED;
4308 break;
4309 }
4310
4311 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4312 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4313
b7b8bef7 4314 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4315 return 0;
4316}
4317
c66ac9db
NB		 4318/* transport_processing_thread():
4319 *
4320 *
4321 */
4322static int transport_processing_thread(void *param)
4323{
5951146d 4324 int ret;
c66ac9db 4325 struct se_cmd *cmd;
8359cf43 4326 struct se_device *dev = param;
c66ac9db 4327
c66ac9db 4328 while (!kthread_should_stop()) {
e3d6f909
AG		 4329 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4330 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4331 kthread_should_stop());
4332 if (ret < 0)
4333 goto out;
4334
c66ac9db 4335get_cmd:
5951146d
AG		 4336 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4337 if (!cmd)
c66ac9db
NB		 4338 continue;
4339
5951146d 4340 switch (cmd->t_state) {
680b73c5
CH		 4341 case TRANSPORT_NEW_CMD:
4342 BUG();
4343 break;
c66ac9db 4344 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4345 if (!cmd->se_tfo->new_cmd_map) {
4346 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4347 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4348 BUG();
4349 }
e3d6f909 4350 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4351 if (ret < 0) {
03e98c9e 4352 transport_generic_request_failure(cmd);
c66ac9db
NB		 4353 break;
4354 }
c66ac9db 4355 ret = transport_generic_new_cmd(cmd);
f147abb4 4356 if (ret < 0) {
03e98c9e
NB		 4357 transport_generic_request_failure(cmd);
4358 break;
c66ac9db
NB		 4359 }
4360 break;
4361 case TRANSPORT_PROCESS_WRITE:
4362 transport_generic_process_write(cmd);
4363 break;
c66ac9db
NB		 4364 case TRANSPORT_PROCESS_TMR:
4365 transport_generic_do_tmr(cmd);
4366 break;
07bde79a 4367 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4368 transport_write_pending_qf(cmd);
4369 break;
4370 case TRANSPORT_COMPLETE_QF_OK:
4371 transport_complete_qf(cmd);
07bde79a 4372 break;
c66ac9db 4373 default:
f2da9dbd
CH		 4374 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4375 "i_state: %d on SE LUN: %u\n",
4376 cmd->t_state,
e3d6f909
AG		 4377 cmd->se_tfo->get_task_tag(cmd),
4378 cmd->se_tfo->get_cmd_state(cmd),
4379 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4380 BUG();
4381 }
4382
4383 goto get_cmd;
4384 }
4385
4386out:
cf572a96 4387 WARN_ON(!list_empty(&dev->state_list));
ce8762f6 4388 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4389 dev->process_thread = NULL;
4390 return 0;
4391}
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