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target: add support for the WRITE_VERIFY command
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
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
33933a0e 333void target_put_session(struct se_session *se_sess)
41ac82b6 334{
33933a0e 335 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 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);
11e764bd
NB		 873 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
874 dev->se_sub_dev->se_dev_attrib.block_size,
875 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
c66ac9db
NB		 876 *bl += sprintf(b + *bl, " ");
877}
878
c66ac9db
NB		 879void transport_dump_vpd_proto_id(
880 struct t10_vpd *vpd,
881 unsigned char *p_buf,
882 int p_buf_len)
883{
884 unsigned char buf[VPD_TMP_BUF_SIZE];
885 int len;
886
887 memset(buf, 0, VPD_TMP_BUF_SIZE);
888 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
889
890 switch (vpd->protocol_identifier) {
891 case 0x00:
892 sprintf(buf+len, "Fibre Channel\n");
893 break;
894 case 0x10:
895 sprintf(buf+len, "Parallel SCSI\n");
896 break;
897 case 0x20:
898 sprintf(buf+len, "SSA\n");
899 break;
900 case 0x30:
901 sprintf(buf+len, "IEEE 1394\n");
902 break;
903 case 0x40:
904 sprintf(buf+len, "SCSI Remote Direct Memory Access"
905 " Protocol\n");
906 break;
907 case 0x50:
908 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
909 break;
910 case 0x60:
911 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
912 break;
913 case 0x70:
914 sprintf(buf+len, "Automation/Drive Interface Transport"
915 " Protocol\n");
916 break;
917 case 0x80:
918 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
919 break;
920 default:
921 sprintf(buf+len, "Unknown 0x%02x\n",
922 vpd->protocol_identifier);
923 break;
924 }
925
926 if (p_buf)
927 strncpy(p_buf, buf, p_buf_len);
928 else
6708bb27 929 pr_debug("%s", buf);
c66ac9db
NB		 930}
931
932void
933transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
934{
935 /*
936 * Check if the Protocol Identifier Valid (PIV) bit is set..
937 *
938 * from spc3r23.pdf section 7.5.1
939 */
940 if (page_83[1] & 0x80) {
941 vpd->protocol_identifier = (page_83[0] & 0xf0);
942 vpd->protocol_identifier_set = 1;
943 transport_dump_vpd_proto_id(vpd, NULL, 0);
944 }
945}
946EXPORT_SYMBOL(transport_set_vpd_proto_id);
947
948int transport_dump_vpd_assoc(
949 struct t10_vpd *vpd,
950 unsigned char *p_buf,
951 int p_buf_len)
952{
953 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 954 int ret = 0;
955 int len;
c66ac9db
NB		 956
957 memset(buf, 0, VPD_TMP_BUF_SIZE);
958 len = sprintf(buf, "T10 VPD Identifier Association: ");
959
960 switch (vpd->association) {
961 case 0x00:
962 sprintf(buf+len, "addressed logical unit\n");
963 break;
964 case 0x10:
965 sprintf(buf+len, "target port\n");
966 break;
967 case 0x20:
968 sprintf(buf+len, "SCSI target device\n");
969 break;
970 default:
971 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 972 ret = -EINVAL;
c66ac9db
NB		 973 break;
974 }
975
976 if (p_buf)
977 strncpy(p_buf, buf, p_buf_len);
978 else
6708bb27 979 pr_debug("%s", buf);
c66ac9db
NB		 980
981 return ret;
982}
983
984int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
985{
986 /*
987 * The VPD identification association..
988 *
989 * from spc3r23.pdf Section 7.6.3.1 Table 297
990 */
991 vpd->association = (page_83[1] & 0x30);
992 return transport_dump_vpd_assoc(vpd, NULL, 0);
993}
994EXPORT_SYMBOL(transport_set_vpd_assoc);
995
996int transport_dump_vpd_ident_type(
997 struct t10_vpd *vpd,
998 unsigned char *p_buf,
999 int p_buf_len)
1000{
1001 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1002 int ret = 0;
1003 int len;
c66ac9db
NB		 1004
1005 memset(buf, 0, VPD_TMP_BUF_SIZE);
1006 len = sprintf(buf, "T10 VPD Identifier Type: ");
1007
1008 switch (vpd->device_identifier_type) {
1009 case 0x00:
1010 sprintf(buf+len, "Vendor specific\n");
1011 break;
1012 case 0x01:
1013 sprintf(buf+len, "T10 Vendor ID based\n");
1014 break;
1015 case 0x02:
1016 sprintf(buf+len, "EUI-64 based\n");
1017 break;
1018 case 0x03:
1019 sprintf(buf+len, "NAA\n");
1020 break;
1021 case 0x04:
1022 sprintf(buf+len, "Relative target port identifier\n");
1023 break;
1024 case 0x08:
1025 sprintf(buf+len, "SCSI name string\n");
1026 break;
1027 default:
1028 sprintf(buf+len, "Unsupported: 0x%02x\n",
1029 vpd->device_identifier_type);
e3d6f909 1030 ret = -EINVAL;
c66ac9db
NB		 1031 break;
1032 }
1033
e3d6f909
AG		 1034 if (p_buf) {
1035 if (p_buf_len < strlen(buf)+1)
1036 return -EINVAL;
c66ac9db 1037 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1038 } else {
6708bb27 1039 pr_debug("%s", buf);
e3d6f909 1040 }
c66ac9db
NB		 1041
1042 return ret;
1043}
1044
1045int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1046{
1047 /*
1048 * The VPD identifier type..
1049 *
1050 * from spc3r23.pdf Section 7.6.3.1 Table 298
1051 */
1052 vpd->device_identifier_type = (page_83[1] & 0x0f);
1053 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1054}
1055EXPORT_SYMBOL(transport_set_vpd_ident_type);
1056
1057int transport_dump_vpd_ident(
1058 struct t10_vpd *vpd,
1059 unsigned char *p_buf,
1060 int p_buf_len)
1061{
1062 unsigned char buf[VPD_TMP_BUF_SIZE];
1063 int ret = 0;
1064
1065 memset(buf, 0, VPD_TMP_BUF_SIZE);
1066
1067 switch (vpd->device_identifier_code_set) {
1068 case 0x01: /* Binary */
1069 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1070 &vpd->device_identifier[0]);
1071 break;
1072 case 0x02: /* ASCII */
1073 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1074 &vpd->device_identifier[0]);
1075 break;
1076 case 0x03: /* UTF-8 */
1077 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1078 &vpd->device_identifier[0]);
1079 break;
1080 default:
1081 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1082 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1083 ret = -EINVAL;
c66ac9db
NB		 1084 break;
1085 }
1086
1087 if (p_buf)
1088 strncpy(p_buf, buf, p_buf_len);
1089 else
6708bb27 1090 pr_debug("%s", buf);
c66ac9db
NB		 1091
1092 return ret;
1093}
1094
1095int
1096transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1097{
1098 static const char hex_str[] = "0123456789abcdef";
1099 int j = 0, i = 4; /* offset to start of the identifer */
1100
1101 /*
1102 * The VPD Code Set (encoding)
1103 *
1104 * from spc3r23.pdf Section 7.6.3.1 Table 296
1105 */
1106 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1107 switch (vpd->device_identifier_code_set) {
1108 case 0x01: /* Binary */
1109 vpd->device_identifier[j++] =
1110 hex_str[vpd->device_identifier_type];
1111 while (i < (4 + page_83[3])) {
1112 vpd->device_identifier[j++] =
1113 hex_str[(page_83[i] & 0xf0) >> 4];
1114 vpd->device_identifier[j++] =
1115 hex_str[page_83[i] & 0x0f];
1116 i++;
1117 }
1118 break;
1119 case 0x02: /* ASCII */
1120 case 0x03: /* UTF-8 */
1121 while (i < (4 + page_83[3]))
1122 vpd->device_identifier[j++] = page_83[i++];
1123 break;
1124 default:
1125 break;
1126 }
1127
1128 return transport_dump_vpd_ident(vpd, NULL, 0);
1129}
1130EXPORT_SYMBOL(transport_set_vpd_ident);
1131
1132static void core_setup_task_attr_emulation(struct se_device *dev)
1133{
1134 /*
1135 * If this device is from Target_Core_Mod/pSCSI, disable the
1136 * SAM Task Attribute emulation.
1137 *
1138 * This is currently not available in upsream Linux/SCSI Target
1139 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1140 */
e3d6f909 1141 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1142 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1143 return;
1144 }
1145
1146 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1147 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1148 " device\n", dev->transport->name,
1149 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1150}
1151
1152static void scsi_dump_inquiry(struct se_device *dev)
1153{
e3d6f909 1154 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1155 char buf[17];
c66ac9db
NB		 1156 int i, device_type;
1157 /*
1158 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1159 */
c66ac9db
NB		 1160 for (i = 0; i < 8; i++)
1161 if (wwn->vendor[i] >= 0x20)
e59a41b6 1162 buf[i] = wwn->vendor[i];
c66ac9db 1163 else
e59a41b6
SAS		 1164 buf[i] = ' ';
1165 buf[i] = '\0';
1166 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1167
c66ac9db
NB		 1168 for (i = 0; i < 16; i++)
1169 if (wwn->model[i] >= 0x20)
e59a41b6 1170 buf[i] = wwn->model[i];
c66ac9db 1171 else
e59a41b6
SAS		 1172 buf[i] = ' ';
1173 buf[i] = '\0';
1174 pr_debug(" Model: %s\n", buf);
c66ac9db 1175
c66ac9db
NB		 1176 for (i = 0; i < 4; i++)
1177 if (wwn->revision[i] >= 0x20)
e59a41b6 1178 buf[i] = wwn->revision[i];
c66ac9db 1179 else
e59a41b6
SAS		 1180 buf[i] = ' ';
1181 buf[i] = '\0';
1182 pr_debug(" Revision: %s\n", buf);
c66ac9db 1183
e3d6f909 1184 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1185 pr_debug(" Type: %s ", scsi_device_type(device_type));
1186 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1187 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1188}
1189
1190struct se_device *transport_add_device_to_core_hba(
1191 struct se_hba *hba,
1192 struct se_subsystem_api *transport,
1193 struct se_subsystem_dev *se_dev,
1194 u32 device_flags,
1195 void *transport_dev,
1196 struct se_dev_limits *dev_limits,
1197 const char *inquiry_prod,
1198 const char *inquiry_rev)
1199{
12a18bdc 1200 int force_pt;
c66ac9db
NB		 1201 struct se_device *dev;
1202
1203 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1204 if (!dev) {
1205 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1206 return NULL;
1207 }
c66ac9db 1208
e3d6f909 1209 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1210 dev->dev_flags = device_flags;
1211 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1212 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1213 dev->se_hba = hba;
1214 dev->se_sub_dev = se_dev;
1215 dev->transport = transport;
c66ac9db
NB		 1216 INIT_LIST_HEAD(&dev->dev_list);
1217 INIT_LIST_HEAD(&dev->dev_sep_list);
1218 INIT_LIST_HEAD(&dev->dev_tmr_list);
cf572a96 1219 INIT_LIST_HEAD(&dev->execute_list);
c66ac9db 1220 INIT_LIST_HEAD(&dev->delayed_cmd_list);
cf572a96 1221 INIT_LIST_HEAD(&dev->state_list);
07bde79a 1222 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1223 spin_lock_init(&dev->execute_task_lock);
1224 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1225 spin_lock_init(&dev->dev_reservation_lock);
1226 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1227 spin_lock_init(&dev->se_port_lock);
1228 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1229 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1230 atomic_set(&dev->dev_ordered_id, 0);
1231
1232 se_dev_set_default_attribs(dev, dev_limits);
1233
1234 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1235 dev->creation_time = get_jiffies_64();
1236 spin_lock_init(&dev->stats_lock);
1237
1238 spin_lock(&hba->device_lock);
1239 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1240 hba->dev_count++;
1241 spin_unlock(&hba->device_lock);
1242 /*
1243 * Setup the SAM Task Attribute emulation for struct se_device
1244 */
1245 core_setup_task_attr_emulation(dev);
1246 /*
1247 * Force PR and ALUA passthrough emulation with internal object use.
1248 */
1249 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1250 /*
1251 * Setup the Reservations infrastructure for struct se_device
1252 */
1253 core_setup_reservations(dev, force_pt);
1254 /*
1255 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1256 */
1257 if (core_setup_alua(dev, force_pt) < 0)
1258 goto out;
1259
1260 /*
1261 * Startup the struct se_device processing thread
1262 */
1263 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1264 "LIO_%s", dev->transport->name);
c66ac9db 1265 if (IS_ERR(dev->process_thread)) {
6708bb27 1266 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1267 dev->transport->name);
c66ac9db
NB		 1268 goto out;
1269 }
07bde79a
NB		 1270 /*
1271 * Setup work_queue for QUEUE_FULL
1272 */
1273 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1274 /*
1275 * Preload the initial INQUIRY const values if we are doing
1276 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1277 * passthrough because this is being provided by the backend LLD.
1278 * This is required so that transport_get_inquiry() copies these
1279 * originals once back into DEV_T10_WWN(dev) for the virtual device
1280 * setup.
1281 */
e3d6f909 1282 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1283 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1284 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1285 " INQUIRY consts\n");
1286 goto out;
1287 }
1288
e3d6f909
AG		 1289 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1290 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1291 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1292 }
1293 scsi_dump_inquiry(dev);
1294
12a18bdc 1295 return dev;
c66ac9db 1296out:
c66ac9db
NB		 1297 kthread_stop(dev->process_thread);
1298
1299 spin_lock(&hba->device_lock);
1300 list_del(&dev->dev_list);
1301 hba->dev_count--;
1302 spin_unlock(&hba->device_lock);
1303
1304 se_release_vpd_for_dev(dev);
1305
c66ac9db
NB		 1306 kfree(dev);
1307
1308 return NULL;
1309}
1310EXPORT_SYMBOL(transport_add_device_to_core_hba);
1311
1312/* transport_generic_prepare_cdb():
1313 *
1314 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1315 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1316 * The point of this is since we are mapping iSCSI LUNs to
1317 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1318 * devices and HBAs for a loop.
1319 */
1320static inline void transport_generic_prepare_cdb(
1321 unsigned char *cdb)
1322{
1323 switch (cdb[0]) {
1324 case READ_10: /* SBC - RDProtect */
1325 case READ_12: /* SBC - RDProtect */
1326 case READ_16: /* SBC - RDProtect */
1327 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1328 case VERIFY: /* SBC - VRProtect */
1329 case VERIFY_16: /* SBC - VRProtect */
1330 case WRITE_VERIFY: /* SBC - VRProtect */
1331 case WRITE_VERIFY_12: /* SBC - VRProtect */
1332 break;
1333 default:
1334 cdb[1] &= 0x1f; /* clear logical unit number */
1335 break;
1336 }
1337}
1338
c66ac9db
NB		 1339static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1340
c66ac9db
NB		 1341/*
1342 * Used by fabric modules containing a local struct se_cmd within their
1343 * fabric dependent per I/O descriptor.
1344 */
1345void transport_init_se_cmd(
1346 struct se_cmd *cmd,
1347 struct target_core_fabric_ops *tfo,
1348 struct se_session *se_sess,
1349 u32 data_length,
1350 int data_direction,
1351 int task_attr,
1352 unsigned char *sense_buffer)
1353{
5951146d
AG		 1354 INIT_LIST_HEAD(&cmd->se_lun_node);
1355 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1356 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1357 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1358 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96
CH		 1359 INIT_LIST_HEAD(&cmd->execute_list);
1360 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1361 init_completion(&cmd->transport_lun_fe_stop_comp);
1362 init_completion(&cmd->transport_lun_stop_comp);
1363 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1364 init_completion(&cmd->cmd_wait_comp);
cf572a96 1365 init_completion(&cmd->task_stop_comp);
a1d8b49a 1366 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1367 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1368
1369 cmd->se_tfo = tfo;
1370 cmd->se_sess = se_sess;
1371 cmd->data_length = data_length;
1372 cmd->data_direction = data_direction;
1373 cmd->sam_task_attr = task_attr;
1374 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1375
1376 cmd->state_active = false;
c66ac9db
NB		 1377}
1378EXPORT_SYMBOL(transport_init_se_cmd);
1379
1380static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1381{
1382 /*
1383 * Check if SAM Task Attribute emulation is enabled for this
1384 * struct se_device storage object
1385 */
5951146d 1386 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1387 return 0;
1388
e66ecd50 1389 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1390 pr_debug("SAM Task Attribute ACA"
c66ac9db 1391 " emulation is not supported\n");
e3d6f909 1392 return -EINVAL;
c66ac9db
NB		 1393 }
1394 /*
1395 * Used to determine when ORDERED commands should go from
1396 * Dormant to Active status.
1397 */
5951146d 1398 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1399 smp_mb__after_atomic_inc();
6708bb27 1400 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1401 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1402 cmd->se_dev->transport->name);
c66ac9db
NB		 1403 return 0;
1404}
1405
a12f41f8 1406/* target_setup_cmd_from_cdb():
c66ac9db
NB		 1407 *
1408 * Called from fabric RX Thread.
1409 */
a12f41f8 1410int target_setup_cmd_from_cdb(
c66ac9db
NB		 1411 struct se_cmd *cmd,
1412 unsigned char *cdb)
1413{
1414 int ret;
1415
1416 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1417 /*
1418 * Ensure that the received CDB is less than the max (252 + 8) bytes
1419 * for VARIABLE_LENGTH_CMD
1420 */
1421 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1422 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1423 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1424 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1425 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1426 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1427 return -EINVAL;
c66ac9db
NB		 1428 }
1429 /*
1430 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1431 * allocate the additional extended CDB buffer now.. Otherwise
1432 * setup the pointer from __t_task_cdb to t_task_cdb.
1433 */
a1d8b49a
AG		 1434 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1435 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1436 GFP_KERNEL);
6708bb27
AG		 1437 if (!cmd->t_task_cdb) {
1438 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1439 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1440 scsi_command_size(cdb),
a1d8b49a 1441 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1442 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1443 cmd->scsi_sense_reason =
1444 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1445 return -ENOMEM;
c66ac9db
NB		 1446 }
1447 } else
a1d8b49a 1448 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1449 /*
a1d8b49a 1450 * Copy the original CDB into cmd->
c66ac9db 1451 */
a1d8b49a 1452 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1453 /*
1454 * Setup the received CDB based on SCSI defined opcodes and
1455 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1456 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1457 * pointer is expected to be setup before we reach this point.
1458 */
1459 ret = transport_generic_cmd_sequencer(cmd, cdb);
1460 if (ret < 0)
1461 return ret;
1462 /*
1463 * Check for SAM Task Attribute Emulation
1464 */
1465 if (transport_check_alloc_task_attr(cmd) < 0) {
1466 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1467 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1468 return -EINVAL;
c66ac9db
NB		 1469 }
1470 spin_lock(&cmd->se_lun->lun_sep_lock);
1471 if (cmd->se_lun->lun_sep)
1472 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1473 spin_unlock(&cmd->se_lun->lun_sep_lock);
1474 return 0;
1475}
a12f41f8 1476EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1477
695434e1
NB		 1478/*
1479 * Used by fabric module frontends to queue tasks directly.
1480 * Many only be used from process context only
1481 */
1482int transport_handle_cdb_direct(
1483 struct se_cmd *cmd)
1484{
dd8ae59d
NB		 1485 int ret;
1486
695434e1
NB		 1487 if (!cmd->se_lun) {
1488 dump_stack();
6708bb27 1489 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1490 return -EINVAL;
1491 }
1492 if (in_interrupt()) {
1493 dump_stack();
6708bb27 1494 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1495 " from interrupt context\n");
1496 return -EINVAL;
1497 }
dd8ae59d 1498 /*
7d680f3b 1499 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
dd8ae59d
NB		 1500 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1501 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1502 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1503 *
1504 * Also, we don't take cmd->t_state_lock here as we only expect
1505 * this to be called for initial descriptor submission.
1506 */
1507 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1508 cmd->transport_state |= CMD_T_ACTIVE;
1509
dd8ae59d
NB		 1510 /*
1511 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1512 * so follow TRANSPORT_NEW_CMD processing thread context usage
1513 * and call transport_generic_request_failure() if necessary..
1514 */
1515 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1516 if (ret < 0)
1517 transport_generic_request_failure(cmd);
1518
dd8ae59d 1519 return 0;
695434e1
NB		 1520}
1521EXPORT_SYMBOL(transport_handle_cdb_direct);
1522
a6360785
NB		 1523/**
1524 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1525 *
1526 * @se_cmd: command descriptor to submit
1527 * @se_sess: associated se_sess for endpoint
1528 * @cdb: pointer to SCSI CDB
1529 * @sense: pointer to SCSI sense buffer
1530 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1531 * @data_length: fabric expected data transfer length
1532 * @task_addr: SAM task attribute
1533 * @data_dir: DMA data direction
1534 * @flags: flags for command submission from target_sc_flags_tables
1535 *
1536 * This may only be called from process context, and also currently
1537 * assumes internal allocation of fabric payload buffer by target-core.
1538 **/
1edcdb49 1539void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1540 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1541 u32 data_length, int task_attr, int data_dir, int flags)
1542{
1543 struct se_portal_group *se_tpg;
1544 int rc;
1545
1546 se_tpg = se_sess->se_tpg;
1547 BUG_ON(!se_tpg);
1548 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1549 BUG_ON(in_interrupt());
1550 /*
1551 * Initialize se_cmd for target operation. From this point
1552 * exceptions are handled by sending exception status via
1553 * target_core_fabric_ops->queue_status() callback
1554 */
1555 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1556 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1557 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1558 se_cmd->unknown_data_length = 1;
a6360785
NB		 1559 /*
1560 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1561 * se_sess->sess_cmd_list. A second kref_get here is necessary
1562 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1563 * kref_put() to happen during fabric packet acknowledgement.
1564 */
1565 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1566 /*
1567 * Signal bidirectional data payloads to target-core
1568 */
1569 if (flags & TARGET_SCF_BIDI_OP)
1570 se_cmd->se_cmd_flags |= SCF_BIDI;
1571 /*
1572 * Locate se_lun pointer and attach it to struct se_cmd
1573 */
735703ca
NB		 1574 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1575 transport_send_check_condition_and_sense(se_cmd,
1576 se_cmd->scsi_sense_reason, 0);
1577 target_put_sess_cmd(se_sess, se_cmd);
1578 return;
1579 }
a6360785
NB		 1580 /*
1581 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1582 * allocate the necessary tasks to complete the received CDB+data
1583 */
a12f41f8 1584 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca
NB		 1585 if (rc != 0) {
1586 transport_generic_request_failure(se_cmd);
1587 return;
1588 }
11e319ed
AG		 1589
1590 /*
1591 * Check if we need to delay processing because of ALUA
1592 * Active/NonOptimized primary access state..
1593 */
1594 core_alua_check_nonop_delay(se_cmd);
1595
a6360785
NB		 1596 /*
1597 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1598 * for immediate execution of READs, otherwise wait for
1599 * transport_generic_handle_data() to be called for WRITEs
1600 * when fabric has filled the incoming buffer.
1601 */
1602 transport_handle_cdb_direct(se_cmd);
1edcdb49 1603 return;
a6360785
NB		 1604}
1605EXPORT_SYMBOL(target_submit_cmd);
1606
9f0d05c2
NB		 1607static void target_complete_tmr_failure(struct work_struct *work)
1608{
1609 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1610
1611 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1612 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1613 transport_generic_free_cmd(se_cmd, 0);
1614}
1615
ea98d7f9
AG		 1616/**
1617 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1618 * for TMR CDBs
1619 *
1620 * @se_cmd: command descriptor to submit
1621 * @se_sess: associated se_sess for endpoint
1622 * @sense: pointer to SCSI sense buffer
1623 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1624 * @fabric_context: fabric context for TMR req
1625 * @tm_type: Type of TM request
c0974f89
NB		 1626 * @gfp: gfp type for caller
1627 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1628 * @flags: submit cmd flags
ea98d7f9
AG		 1629 *
1630 * Callable from all contexts.
1631 **/
1632
c7042cae 1633int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1634 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1635 void *fabric_tmr_ptr, unsigned char tm_type,
1636 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1637{
1638 struct se_portal_group *se_tpg;
1639 int ret;
1640
1641 se_tpg = se_sess->se_tpg;
1642 BUG_ON(!se_tpg);
1643
1644 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1645 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1646 /*
1647 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1648 * allocation failure.
1649 */
c0974f89 1650 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1651 if (ret < 0)
1652 return -ENOMEM;
ea98d7f9 1653
c0974f89
NB		 1654 if (tm_type == TMR_ABORT_TASK)
1655 se_cmd->se_tmr_req->ref_task_tag = tag;
1656
ea98d7f9
AG		 1657 /* See target_submit_cmd for commentary */
1658 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1659
ea98d7f9
AG		 1660 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1661 if (ret) {
9f0d05c2
NB		 1662 /*
1663 * For callback during failure handling, push this work off
1664 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1665 */
1666 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1667 schedule_work(&se_cmd->work);
c7042cae 1668 return 0;
ea98d7f9
AG		 1669 }
1670 transport_generic_handle_tmr(se_cmd);
c7042cae 1671 return 0;
ea98d7f9
AG		 1672}
1673EXPORT_SYMBOL(target_submit_tmr);
1674
c66ac9db
NB		 1675/*
1676 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1677 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1678 * complete setup in TCM process context w/ TFO->new_cmd_map().
1679 */
1680int transport_generic_handle_cdb_map(
1681 struct se_cmd *cmd)
1682{
e3d6f909 1683 if (!cmd->se_lun) {
c66ac9db 1684 dump_stack();
6708bb27 1685 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1686 return -EINVAL;
c66ac9db
NB		 1687 }
1688
f7a5cc0b 1689 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1690 return 0;
1691}
1692EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1693
1694/* transport_generic_handle_data():
1695 *
1696 *
1697 */
1698int transport_generic_handle_data(
1699 struct se_cmd *cmd)
1700{
1701 /*
1702 * For the software fabric case, then we assume the nexus is being
1703 * failed/shutdown when signals are pending from the kthread context
1704 * caller, so we return a failure. For the HW target mode case running
1705 * in interrupt code, the signal_pending() check is skipped.
1706 */
1707 if (!in_interrupt() && signal_pending(current))
e3d6f909 1708 return -EPERM;
c66ac9db
NB		 1709 /*
1710 * If the received CDB has aleady been ABORTED by the generic
1711 * target engine, we now call transport_check_aborted_status()
1712 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1713 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1714 * sequences at this point.
1715 */
1716 if (transport_check_aborted_status(cmd, 1) != 0)
1717 return 0;
1718
f7a5cc0b 1719 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1720 return 0;
1721}
1722EXPORT_SYMBOL(transport_generic_handle_data);
1723
1724/* transport_generic_handle_tmr():
1725 *
1726 *
1727 */
1728int transport_generic_handle_tmr(
1729 struct se_cmd *cmd)
1730{
f7a5cc0b 1731 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1732 return 0;
1733}
1734EXPORT_SYMBOL(transport_generic_handle_tmr);
1735
cdbb70bb 1736/*
cf572a96 1737 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1738 * has completed.
1739 */
cf572a96 1740bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1741{
cdbb70bb
CH		 1742 bool was_active = false;
1743
cf572a96
CH		 1744 if (cmd->transport_state & CMD_T_BUSY) {
1745 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1746 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1747
cf572a96
CH		 1748 pr_debug("cmd %p waiting to complete\n", cmd);
1749 wait_for_completion(&cmd->task_stop_comp);
1750 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1751
1752 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1753 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1754 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1755 was_active = true;
1756 }
1757
cdbb70bb
CH		 1758 return was_active;
1759}
1760
c66ac9db
NB		 1761/*
1762 * Handle SAM-esque emulation for generic transport request failures.
1763 */
2fbff127 1764void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1765{
07bde79a
NB		 1766 int ret = 0;
1767
6708bb27 1768 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1769 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1770 cmd->t_task_cdb[0]);
03e98c9e 1771 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1772 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1773 cmd->t_state, cmd->scsi_sense_reason);
d43d6aea 1774 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1775 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1776 (cmd->transport_state & CMD_T_STOP) != 0,
1777 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1778
c66ac9db
NB		 1779 /*
1780 * For SAM Task Attribute emulation for failed struct se_cmd
1781 */
1782 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1783 transport_complete_task_attr(cmd);
1784
03e98c9e
NB		 1785 switch (cmd->scsi_sense_reason) {
1786 case TCM_NON_EXISTENT_LUN:
1787 case TCM_UNSUPPORTED_SCSI_OPCODE:
1788 case TCM_INVALID_CDB_FIELD:
1789 case TCM_INVALID_PARAMETER_LIST:
1790 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1791 case TCM_UNKNOWN_MODE_PAGE:
1792 case TCM_WRITE_PROTECTED:
1793 case TCM_CHECK_CONDITION_ABORT_CMD:
1794 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1795 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1796 break;
03e98c9e 1797 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1798 /*
1799 * No SENSE Data payload for this case, set SCSI Status
1800 * and queue the response to $FABRIC_MOD.
1801 *
1802 * Uses linux/include/scsi/scsi.h SAM status codes defs
1803 */
1804 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1805 /*
1806 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1807 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1808 * CONFLICT STATUS.
1809 *
1810 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1811 */
e3d6f909
AG		 1812 if (cmd->se_sess &&
1813 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1814 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1815 cmd->orig_fe_lun, 0x2C,
1816 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1817
07bde79a 1818 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1819 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1820 goto queue_full;
c66ac9db 1821 goto check_stop;
c66ac9db 1822 default:
6708bb27 1823 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1824 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1825 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1826 break;
1827 }
16ab8e60
NB		 1828 /*
1829 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1830 * make the call to transport_send_check_condition_and_sense()
1831 * directly. Otherwise expect the fabric to make the call to
1832 * transport_send_check_condition_and_sense() after handling
1833 * possible unsoliticied write data payloads.
1834 */
03e98c9e
NB		 1835 ret = transport_send_check_condition_and_sense(cmd,
1836 cmd->scsi_sense_reason, 0);
1837 if (ret == -EAGAIN || ret == -ENOMEM)
1838 goto queue_full;
07bde79a 1839
c66ac9db
NB		 1840check_stop:
1841 transport_lun_remove_cmd(cmd);
6708bb27 1842 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1843 ;
07bde79a
NB		 1844 return;
1845
1846queue_full:
e057f533
CH		 1847 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1848 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1849}
2fbff127 1850EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1851
c66ac9db
NB		 1852static inline u32 transport_lba_21(unsigned char *cdb)
1853{
1854 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1855}
1856
1857static inline u32 transport_lba_32(unsigned char *cdb)
1858{
1859 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1860}
1861
1862static inline unsigned long long transport_lba_64(unsigned char *cdb)
1863{
1864 unsigned int __v1, __v2;
1865
1866 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1867 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1868
1869 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1870}
1871
1872/*
1873 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1874 */
1875static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1876{
1877 unsigned int __v1, __v2;
1878
1879 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1880 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1881
1882 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1883}
1884
1885static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1886{
1887 unsigned long flags;
1888
a1d8b49a 1889 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 1890 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 1891 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 1892}
1893
c66ac9db
NB		 1894/*
1895 * Called from Fabric Module context from transport_execute_tasks()
1896 *
1897 * The return of this function determins if the tasks from struct se_cmd
1898 * get added to the execution queue in transport_execute_tasks(),
1899 * or are added to the delayed or ordered lists here.
1900 */
1901static inline int transport_execute_task_attr(struct se_cmd *cmd)
1902{
5951146d 1903 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1904 return 1;
1905 /*
25985edc 1906 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1907 * to allow the passed struct se_cmd list of tasks to the front of the list.
1908 */
e66ecd50 1909 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
6708bb27 1910 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 1911 " 0x%02x, se_ordered_id: %u\n",
6708bb27 1912 cmd->t_task_cdb[0],
c66ac9db
NB		 1913 cmd->se_ordered_id);
1914 return 1;
e66ecd50 1915 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d 1916 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 1917 smp_mb__after_atomic_inc();
1918
6708bb27 1919 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 1920 " list, se_ordered_id: %u\n",
a1d8b49a 1921 cmd->t_task_cdb[0],
c66ac9db
NB		 1922 cmd->se_ordered_id);
1923 /*
1924 * Add ORDERED command to tail of execution queue if
1925 * no other older commands exist that need to be
1926 * completed first.
1927 */
6708bb27 1928 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 1929 return 1;
1930 } else {
1931 /*
1932 * For SIMPLE and UNTAGGED Task Attribute commands
1933 */
5951146d 1934 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 1935 smp_mb__after_atomic_inc();
1936 }
1937 /*
1938 * Otherwise if one or more outstanding ORDERED task attribute exist,
1939 * add the dormant task(s) built for the passed struct se_cmd to the
1940 * execution queue and become in Active state for this struct se_device.
1941 */
5951146d 1942 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 1943 /*
1944 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 1945 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 1946 */
5951146d 1947 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 1948 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 1949 list_add_tail(&cmd->se_delayed_node,
1950 &cmd->se_dev->delayed_cmd_list);
1951 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 1952
6708bb27 1953 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 1954 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 1955 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 1956 cmd->se_ordered_id);
1957 /*
1958 * Return zero to let transport_execute_tasks() know
1959 * not to add the delayed tasks to the execution list.
1960 */
1961 return 0;
1962 }
1963 /*
1964 * Otherwise, no ORDERED task attributes exist..
1965 */
1966 return 1;
1967}
1968
1969/*
1970 * Called from fabric module context in transport_generic_new_cmd() and
1971 * transport_generic_process_write()
1972 */
d28d96dc 1973static void transport_execute_tasks(struct se_cmd *cmd)
c66ac9db
NB		 1974{
1975 int add_tasks;
40be67f4 1976 struct se_device *se_dev = cmd->se_dev;
c66ac9db
NB		 1977 /*
1978 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 1979 * has occurred that prevents execution.
c66ac9db 1980 */
6708bb27 1981 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 1982 /*
1983 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
1984 * attribute for the tasks of the received struct se_cmd CDB
1985 */
1986 add_tasks = transport_execute_task_attr(cmd);
d28d96dc
JE		 1987 if (add_tasks) {
1988 __transport_execute_tasks(se_dev, cmd);
1989 return;
1990 }
c66ac9db 1991 }
4d2300cc 1992 __transport_execute_tasks(se_dev, NULL);
c66ac9db
NB		 1993}
1994
4d2300cc 1995static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
c66ac9db
NB		 1996{
1997 int error;
1998 struct se_cmd *cmd = NULL;
c66ac9db
NB		 1999 unsigned long flags;
2000
c66ac9db 2001check_depth:
e3d6f909 2002 spin_lock_irq(&dev->execute_task_lock);
4d2300cc 2003 if (new_cmd != NULL)
cf572a96 2004 __target_add_to_execute_list(new_cmd);
4d2300cc 2005
cf572a96 2006 if (list_empty(&dev->execute_list)) {
e3d6f909 2007 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2008 return 0;
2009 }
cf572a96
CH		 2010 cmd = list_first_entry(&dev->execute_list, struct se_cmd, execute_list);
2011 __target_remove_from_execute_list(cmd);
e3d6f909 2012 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db 2013
a1d8b49a 2014 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 2015 cmd->transport_state |= CMD_T_BUSY;
785fdf70 2016 cmd->transport_state |= CMD_T_SENT;
c66ac9db 2017
a1d8b49a 2018 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2019
6bb35e00
CH		 2020 if (cmd->execute_cmd)
2021 error = cmd->execute_cmd(cmd);
5787cacd
CH		 2022 else {
2023 error = dev->transport->execute_cmd(cmd, cmd->t_data_sg,
2024 cmd->t_data_nents, cmd->data_direction);
2025 }
cf572a96 2026
d29a5b6a 2027 if (error != 0) {
d29a5b6a 2028 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 2029 cmd->transport_state &= ~CMD_T_BUSY;
7d680f3b 2030 cmd->transport_state &= ~CMD_T_SENT;
d29a5b6a 2031 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
7d680f3b 2032
03e98c9e 2033 transport_generic_request_failure(cmd);
c66ac9db
NB		 2034 }
2035
4d2300cc 2036 new_cmd = NULL;
c66ac9db
NB		 2037 goto check_depth;
2038
2039 return 0;
2040}
2041
c66ac9db
NB		 2042static inline u32 transport_get_sectors_6(
2043 unsigned char *cdb,
2044 struct se_cmd *cmd,
2045 int *ret)
2046{
5951146d 2047 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2048
2049 /*
2050 * Assume TYPE_DISK for non struct se_device objects.
2051 * Use 8-bit sector value.
2052 */
2053 if (!dev)
2054 goto type_disk;
2055
2056 /*
2057 * Use 24-bit allocation length for TYPE_TAPE.
2058 */
e3d6f909 2059 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2060 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2061
2062 /*
2063 * Everything else assume TYPE_DISK Sector CDB location.
9b5cd7f3
RD		 2064 * Use 8-bit sector value. SBC-3 says:
2065 *
2066 * A TRANSFER LENGTH field set to zero specifies that 256
2067 * logical blocks shall be written. Any other value
2068 * specifies the number of logical blocks that shall be
2069 * written.
c66ac9db
NB		 2070 */
2071type_disk:
9b5cd7f3 2072 return cdb[4] ? : 256;
c66ac9db
NB		 2073}
2074
2075static inline u32 transport_get_sectors_10(
2076 unsigned char *cdb,
2077 struct se_cmd *cmd,
2078 int *ret)
2079{
5951146d 2080 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2081
2082 /*
2083 * Assume TYPE_DISK for non struct se_device objects.
2084 * Use 16-bit sector value.
2085 */
2086 if (!dev)
2087 goto type_disk;
2088
2089 /*
2090 * XXX_10 is not defined in SSC, throw an exception
2091 */
e3d6f909
AG		 2092 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2093 *ret = -EINVAL;
c66ac9db
NB		 2094 return 0;
2095 }
2096
2097 /*
2098 * Everything else assume TYPE_DISK Sector CDB location.
2099 * Use 16-bit sector value.
2100 */
2101type_disk:
2102 return (u32)(cdb[7] << 8) + cdb[8];
2103}
2104
2105static inline u32 transport_get_sectors_12(
2106 unsigned char *cdb,
2107 struct se_cmd *cmd,
2108 int *ret)
2109{
5951146d 2110 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2111
2112 /*
2113 * Assume TYPE_DISK for non struct se_device objects.
2114 * Use 32-bit sector value.
2115 */
2116 if (!dev)
2117 goto type_disk;
2118
2119 /*
2120 * XXX_12 is not defined in SSC, throw an exception
2121 */
e3d6f909
AG		 2122 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2123 *ret = -EINVAL;
c66ac9db
NB		 2124 return 0;
2125 }
2126
2127 /*
2128 * Everything else assume TYPE_DISK Sector CDB location.
2129 * Use 32-bit sector value.
2130 */
2131type_disk:
2132 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2133}
2134
2135static inline u32 transport_get_sectors_16(
2136 unsigned char *cdb,
2137 struct se_cmd *cmd,
2138 int *ret)
2139{
5951146d 2140 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2141
2142 /*
2143 * Assume TYPE_DISK for non struct se_device objects.
2144 * Use 32-bit sector value.
2145 */
2146 if (!dev)
2147 goto type_disk;
2148
2149 /*
2150 * Use 24-bit allocation length for TYPE_TAPE.
2151 */
e3d6f909 2152 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2153 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2154
2155type_disk:
2156 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2157 (cdb[12] << 8) + cdb[13];
2158}
2159
2160/*
2161 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2162 */
2163static inline u32 transport_get_sectors_32(
2164 unsigned char *cdb,
2165 struct se_cmd *cmd,
2166 int *ret)
2167{
2168 /*
2169 * Assume TYPE_DISK for non struct se_device objects.
2170 * Use 32-bit sector value.
2171 */
2172 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2173 (cdb[30] << 8) + cdb[31];
2174
2175}
2176
2177static inline u32 transport_get_size(
2178 u32 sectors,
2179 unsigned char *cdb,
2180 struct se_cmd *cmd)
2181{
5951146d 2182 struct se_device *dev = cmd->se_dev;
c66ac9db 2183
e3d6f909 2184 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2185 if (cdb[1] & 1) { /* sectors */
e3d6f909 2186 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2187 } else /* bytes */
2188 return sectors;
2189 }
8b1e1244 2190
6708bb27 2191 pr_debug("Returning block_size: %u, sectors: %u == %u for"
8b1e1244
AG		 2192 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size,
2193 sectors, dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2194 dev->transport->name);
2195
e3d6f909 2196 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2197}
2198
c66ac9db
NB		 2199static void transport_xor_callback(struct se_cmd *cmd)
2200{
2201 unsigned char *buf, *addr;
ec98f782 2202 struct scatterlist *sg;
c66ac9db
NB		 2203 unsigned int offset;
2204 int i;
ec98f782 2205 int count;
c66ac9db
NB		 2206 /*
2207 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2208 *
2209 * 1) read the specified logical block(s);
2210 * 2) transfer logical blocks from the data-out buffer;
2211 * 3) XOR the logical blocks transferred from the data-out buffer with
2212 * the logical blocks read, storing the resulting XOR data in a buffer;
2213 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2214 * blocks transferred from the data-out buffer; and
2215 * 5) transfer the resulting XOR data to the data-in buffer.
2216 */
2217 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2218 if (!buf) {
2219 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2220 return;
2221 }
2222 /*
ec98f782 2223 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2224 * into the locally allocated *buf
2225 */
ec98f782
AG		 2226 sg_copy_to_buffer(cmd->t_data_sg,
2227 cmd->t_data_nents,
2228 buf,
2229 cmd->data_length);
2230
c66ac9db
NB		 2231 /*
2232 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2233 * cmd->t_mem_bidi_list
c66ac9db
NB		 2234 */
2235
2236 offset = 0;
ec98f782 2237 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
ca747d61 2238 addr = kmap_atomic(sg_page(sg));
ec98f782 2239 if (!addr)
c66ac9db
NB		 2240 goto out;
2241
ec98f782
AG		 2242 for (i = 0; i < sg->length; i++)
2243 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2244
ec98f782 2245 offset += sg->length;
ca747d61 2246 kunmap_atomic(addr);
c66ac9db 2247 }
ec98f782 2248
c66ac9db
NB		 2249out:
2250 kfree(buf);
2251}
2252
2253/*
2254 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2255 */
2256static int transport_get_sense_data(struct se_cmd *cmd)
2257{
2258 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2259 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2260 unsigned long flags;
2261 u32 offset = 0;
2262
e3d6f909
AG		 2263 WARN_ON(!cmd->se_lun);
2264
42bf829e
CH		 2265 if (!dev)
2266 return 0;
2267
a1d8b49a 2268 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2269 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2270 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2271 return 0;
2272 }
2273
cf572a96
CH		 2274 if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2275 goto out;
c66ac9db 2276
cf572a96
CH		 2277 if (!dev->transport->get_sense_buffer) {
2278 pr_err("dev->transport->get_sense_buffer is NULL\n");
2279 goto out;
2280 }
c66ac9db 2281
5787cacd 2282 sense_buffer = dev->transport->get_sense_buffer(cmd);
cf572a96 2283 if (!sense_buffer) {
5787cacd 2284 pr_err("ITT 0x%08x cmd %p: Unable to locate"
cf572a96 2285 " sense buffer for task with sense\n",
5787cacd 2286 cmd->se_tfo->get_task_tag(cmd), cmd);
cf572a96 2287 goto out;
c66ac9db 2288 }
5787cacd 2289
cf572a96
CH		 2290 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2291
2292 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
2293
2294 memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
cf572a96
CH		 2295
2296 /* Automatically padded */
2297 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
2298
2299 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2300 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
2301 return 0;
2302
785fdf70 2303out:
a1d8b49a 2304 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2305 return -1;
2306}
2307
ec98f782
AG		 2308static inline long long transport_dev_end_lba(struct se_device *dev)
2309{
2310 return dev->transport->get_blocks(dev) + 1;
2311}
2312
2313static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2314{
2315 struct se_device *dev = cmd->se_dev;
2316 u32 sectors;
2317
2318 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2319 return 0;
2320
2321 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2322
6708bb27
AG		 2323 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2324 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2325 " transport_dev_end_lba(): %llu\n",
2326 cmd->t_task_lba, sectors,
2327 transport_dev_end_lba(dev));
7abbe7f3 2328 return -EINVAL;
ec98f782
AG		 2329 }
2330
7abbe7f3 2331 return 0;
ec98f782
AG		 2332}
2333
706d5860
NB		 2334static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2335{
2336 /*
2337 * Determine if the received WRITE_SAME is used to for direct
2338 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2339 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2340 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2341 */
2342 int passthrough = (dev->transport->transport_type ==
2343 TRANSPORT_PLUGIN_PHBA_PDEV);
2344
2345 if (!passthrough) {
2346 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2347 pr_err("WRITE_SAME PBDATA and LBDATA"
2348 " bits not supported for Block Discard"
2349 " Emulation\n");
2350 return -ENOSYS;
2351 }
2352 /*
2353 * Currently for the emulated case we only accept
2354 * tpws with the UNMAP=1 bit set.
2355 */
2356 if (!(flags[0] & 0x08)) {
2357 pr_err("WRITE_SAME w/o UNMAP bit not"
2358 " supported for Block Discard Emulation\n");
2359 return -ENOSYS;
2360 }
2361 }
2362
2363 return 0;
2364}
2365
c66ac9db
NB		 2366/* transport_generic_cmd_sequencer():
2367 *
2368 * Generic Command Sequencer that should work for most DAS transport
2369 * drivers.
2370 *
a12f41f8 2371 * Called from target_setup_cmd_from_cdb() in the $FABRIC_MOD
c66ac9db
NB		 2372 * RX Thread.
2373 *
2374 * FIXME: Need to support other SCSI OPCODES where as well.
2375 */
2376static int transport_generic_cmd_sequencer(
2377 struct se_cmd *cmd,
2378 unsigned char *cdb)
2379{
5951146d 2380 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2381 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2382 int ret = 0, sector_ret = 0, passthrough;
2383 u32 sectors = 0, size = 0, pr_reg_type = 0;
2384 u16 service_action;
2385 u8 alua_ascq = 0;
2386 /*
2387 * Check for an existing UNIT ATTENTION condition
2388 */
2389 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2390 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2391 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2392 return -EINVAL;
c66ac9db
NB		 2393 }
2394 /*
2395 * Check status of Asymmetric Logical Unit Assignment port
2396 */
e3d6f909 2397 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2398 if (ret != 0) {
c66ac9db 2399 /*
25985edc 2400 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2401 * The ALUA additional sense code qualifier (ASCQ) is determined
2402 * by the ALUA primary or secondary access state..
2403 */
2404 if (ret > 0) {
6708bb27 2405 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2406 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2407 cmd->se_tfo->get_fabric_name(), alua_ascq);
8b1e1244 2408
c66ac9db
NB		 2409 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2410 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2411 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2412 return -EINVAL;
c66ac9db
NB		 2413 }
2414 goto out_invalid_cdb_field;
2415 }
2416 /*
2417 * Check status for SPC-3 Persistent Reservations
2418 */
e3d6f909
AG		 2419 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2420 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2421 cmd, cdb, pr_reg_type) != 0) {
2422 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2423 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
087a03b3 2424 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
03e98c9e
NB		 2425 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2426 return -EBUSY;
2427 }
c66ac9db
NB		 2428 /*
2429 * This means the CDB is allowed for the SCSI Initiator port
2430 * when said port is *NOT* holding the legacy SPC-2 or
2431 * SPC-3 Persistent Reservation.
2432 */
2433 }
2434
5bda90c8
CH		 2435 /*
2436 * If we operate in passthrough mode we skip most CDB emulation and
2437 * instead hand the commands down to the physical SCSI device.
2438 */
2439 passthrough =
2440 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2441
c66ac9db
NB		 2442 switch (cdb[0]) {
2443 case READ_6:
2444 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2445 if (sector_ret)
2446 goto out_unsupported_cdb;
2447 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2448 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2449 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2450 break;
2451 case READ_10:
2452 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2453 if (sector_ret)
2454 goto out_unsupported_cdb;
2455 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2456 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2457 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2458 break;
2459 case READ_12:
2460 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2461 if (sector_ret)
2462 goto out_unsupported_cdb;
2463 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2464 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2465 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2466 break;
2467 case READ_16:
2468 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2469 if (sector_ret)
2470 goto out_unsupported_cdb;
2471 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2472 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2473 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2474 break;
2475 case WRITE_6:
2476 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2477 if (sector_ret)
2478 goto out_unsupported_cdb;
2479 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2480 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2481 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2482 break;
2483 case WRITE_10:
66246617 2484 case WRITE_VERIFY:
c66ac9db
NB		 2485 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2486 if (sector_ret)
2487 goto out_unsupported_cdb;
2488 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2489 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2490 if (cdb[1] & 0x8)
2491 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2492 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2493 break;
2494 case WRITE_12:
2495 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2496 if (sector_ret)
2497 goto out_unsupported_cdb;
2498 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2499 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2500 if (cdb[1] & 0x8)
2501 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2502 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2503 break;
2504 case WRITE_16:
2505 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2506 if (sector_ret)
2507 goto out_unsupported_cdb;
2508 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2509 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2510 if (cdb[1] & 0x8)
2511 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2512 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2513 break;
2514 case XDWRITEREAD_10:
2515 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2516 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2517 goto out_invalid_cdb_field;
2518 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2519 if (sector_ret)
2520 goto out_unsupported_cdb;
2521 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2522 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2523 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2524
5bda90c8
CH		 2525 /*
2526 * Do now allow BIDI commands for passthrough mode.
2527 */
2528 if (passthrough)
7c1c6af3 2529 goto out_unsupported_cdb;
5bda90c8 2530
c66ac9db 2531 /*
35e0e757 2532 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2533 */
2534 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2535 if (cdb[1] & 0x8)
2536 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2537 break;
2538 case VARIABLE_LENGTH_CMD:
2539 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2540 switch (service_action) {
2541 case XDWRITEREAD_32:
2542 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2543 if (sector_ret)
2544 goto out_unsupported_cdb;
2545 size = transport_get_size(sectors, cdb, cmd);
2546 /*
2547 * Use WRITE_32 and READ_32 opcodes for the emulated
2548 * XDWRITE_READ_32 logic.
2549 */
a1d8b49a 2550 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2551 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2552
5bda90c8
CH		 2553 /*
2554 * Do now allow BIDI commands for passthrough mode.
2555 */
c66ac9db 2556 if (passthrough)
7c1c6af3 2557 goto out_unsupported_cdb;
5bda90c8 2558
c66ac9db 2559 /*
35e0e757
CH		 2560 * Setup BIDI XOR callback to be run during after I/O
2561 * completion.
c66ac9db
NB		 2562 */
2563 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2564 if (cdb[1] & 0x8)
2565 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2566 break;
2567 case WRITE_SAME_32:
2568 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2569 if (sector_ret)
2570 goto out_unsupported_cdb;
dd3a5ad8 2571
6708bb27 2572 if (sectors)
12850626 2573 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2574 else {
2575 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2576 " supported\n");
2577 goto out_invalid_cdb_field;
2578 }
dd3a5ad8 2579
a1d8b49a 2580 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2581 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2582
706d5860 2583 if (target_check_write_same_discard(&cdb[10], dev) < 0)
67236c44 2584 goto out_unsupported_cdb;
5bda90c8 2585 if (!passthrough)
6bb35e00 2586 cmd->execute_cmd = target_emulate_write_same;
c66ac9db
NB		 2587 break;
2588 default:
6708bb27 2589 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2590 " 0x%04x not supported\n", service_action);
2591 goto out_unsupported_cdb;
2592 }
2593 break;
e434f1f1 2594 case MAINTENANCE_IN:
e3d6f909 2595 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2596 /* MAINTENANCE_IN from SCC-2 */
2597 /*
2598 * Check for emulated MI_REPORT_TARGET_PGS.
2599 */
e76a35d6
CH		 2600 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2601 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
6bb35e00 2602 cmd->execute_cmd =
e76a35d6 2603 target_emulate_report_target_port_groups;
c66ac9db
NB		 2604 }
2605 size = (cdb[6] << 24) | (cdb[7] << 16) |
2606 (cdb[8] << 8) | cdb[9];
2607 } else {
2608 /* GPCMD_SEND_KEY from multi media commands */
2609 size = (cdb[8] << 8) + cdb[9];
2610 }
05d1c7c0 2611 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2612 break;
2613 case MODE_SELECT:
2614 size = cdb[4];
2615 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2616 break;
2617 case MODE_SELECT_10:
2618 size = (cdb[7] << 8) + cdb[8];
2619 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2620 break;
2621 case MODE_SENSE:
2622 size = cdb[4];
05d1c7c0 2623 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2624 if (!passthrough)
6bb35e00 2625 cmd->execute_cmd = target_emulate_modesense;
c66ac9db
NB		 2626 break;
2627 case MODE_SENSE_10:
5bda90c8
CH		 2628 size = (cdb[7] << 8) + cdb[8];
2629 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2630 if (!passthrough)
6bb35e00 2631 cmd->execute_cmd = target_emulate_modesense;
5bda90c8 2632 break;
c66ac9db
NB		 2633 case GPCMD_READ_BUFFER_CAPACITY:
2634 case GPCMD_SEND_OPC:
2635 case LOG_SELECT:
2636 case LOG_SENSE:
2637 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2638 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2639 break;
2640 case READ_BLOCK_LIMITS:
2641 size = READ_BLOCK_LEN;
05d1c7c0 2642 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2643 break;
2644 case GPCMD_GET_CONFIGURATION:
2645 case GPCMD_READ_FORMAT_CAPACITIES:
2646 case GPCMD_READ_DISC_INFO:
2647 case GPCMD_READ_TRACK_RZONE_INFO:
2648 size = (cdb[7] << 8) + cdb[8];
2649 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2650 break;
2651 case PERSISTENT_RESERVE_IN:
617c0e06 2652 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
6bb35e00 2653 cmd->execute_cmd = target_scsi3_emulate_pr_in;
617c0e06
CH		 2654 size = (cdb[7] << 8) + cdb[8];
2655 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2656 break;
c66ac9db 2657 case PERSISTENT_RESERVE_OUT:
617c0e06 2658 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
6bb35e00 2659 cmd->execute_cmd = target_scsi3_emulate_pr_out;
c66ac9db 2660 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2661 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2662 break;
2663 case GPCMD_MECHANISM_STATUS:
2664 case GPCMD_READ_DVD_STRUCTURE:
2665 size = (cdb[8] << 8) + cdb[9];
2666 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2667 break;
2668 case READ_POSITION:
2669 size = READ_POSITION_LEN;
05d1c7c0 2670 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2671 break;
e434f1f1 2672 case MAINTENANCE_OUT:
e3d6f909 2673 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2674 /* MAINTENANCE_OUT from SCC-2
2675 *
2676 * Check for emulated MO_SET_TARGET_PGS.
2677 */
e76a35d6
CH		 2678 if (cdb[1] == MO_SET_TARGET_PGS &&
2679 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
6bb35e00 2680 cmd->execute_cmd =
e76a35d6 2681 target_emulate_set_target_port_groups;
c66ac9db
NB		 2682 }
2683
2684 size = (cdb[6] << 24) | (cdb[7] << 16) |
2685 (cdb[8] << 8) | cdb[9];
2686 } else {
2687 /* GPCMD_REPORT_KEY from multi media commands */
2688 size = (cdb[8] << 8) + cdb[9];
2689 }
05d1c7c0 2690 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2691 break;
2692 case INQUIRY:
2693 size = (cdb[3] << 8) + cdb[4];
2694 /*
2695 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2696 * See spc4r17 section 5.3
2697 */
5951146d 2698 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2699 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2700 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2701 if (!passthrough)
6bb35e00 2702 cmd->execute_cmd = target_emulate_inquiry;
c66ac9db
NB		 2703 break;
2704 case READ_BUFFER:
2705 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2706 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2707 break;
2708 case READ_CAPACITY:
2709 size = READ_CAP_LEN;
05d1c7c0 2710 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2711 if (!passthrough)
6bb35e00 2712 cmd->execute_cmd = target_emulate_readcapacity;
c66ac9db
NB		 2713 break;
2714 case READ_MEDIA_SERIAL_NUMBER:
2715 case SECURITY_PROTOCOL_IN:
2716 case SECURITY_PROTOCOL_OUT:
2717 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2718 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2719 break;
2720 case SERVICE_ACTION_IN:
5bda90c8
CH		 2721 switch (cmd->t_task_cdb[1] & 0x1f) {
2722 case SAI_READ_CAPACITY_16:
2723 if (!passthrough)
6bb35e00 2724 cmd->execute_cmd =
5bda90c8
CH		 2725 target_emulate_readcapacity_16;
2726 break;
2727 default:
2728 if (passthrough)
2729 break;
2730
2731 pr_err("Unsupported SA: 0x%02x\n",
2732 cmd->t_task_cdb[1] & 0x1f);
b168fe8c 2733 goto out_invalid_cdb_field;
5bda90c8
CH		 2734 }
2735 /*FALLTHROUGH*/
c66ac9db
NB		 2736 case ACCESS_CONTROL_IN:
2737 case ACCESS_CONTROL_OUT:
2738 case EXTENDED_COPY:
2739 case READ_ATTRIBUTE:
2740 case RECEIVE_COPY_RESULTS:
2741 case WRITE_ATTRIBUTE:
2742 size = (cdb[10] << 24) | (cdb[11] << 16) |
2743 (cdb[12] << 8) | cdb[13];
05d1c7c0 2744 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2745 break;
2746 case RECEIVE_DIAGNOSTIC:
2747 case SEND_DIAGNOSTIC:
2748 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2749 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2750 break;
2751/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2752#if 0
2753 case GPCMD_READ_CD:
2754 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2755 size = (2336 * sectors);
05d1c7c0 2756 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2757 break;
2758#endif
2759 case READ_TOC:
2760 size = cdb[8];
05d1c7c0 2761 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2762 break;
2763 case REQUEST_SENSE:
2764 size = cdb[4];
05d1c7c0 2765 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2766 if (!passthrough)
6bb35e00 2767 cmd->execute_cmd = target_emulate_request_sense;
c66ac9db
NB		 2768 break;
2769 case READ_ELEMENT_STATUS:
2770 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2771 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2772 break;
2773 case WRITE_BUFFER:
2774 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2775 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2776 break;
2777 case RESERVE:
2778 case RESERVE_10:
2779 /*
2780 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2781 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2782 */
2783 if (cdb[0] == RESERVE_10)
2784 size = (cdb[7] << 8) | cdb[8];
2785 else
2786 size = cmd->data_length;
2787
2788 /*
2789 * Setup the legacy emulated handler for SPC-2 and
2790 * >= SPC-3 compatible reservation handling (CRH=1)
2791 * Otherwise, we assume the underlying SCSI logic is
2792 * is running in SPC_PASSTHROUGH, and wants reservations
2793 * emulation disabled.
2794 */
e76a35d6 2795 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
6bb35e00 2796 cmd->execute_cmd = target_scsi2_reservation_reserve;
c66ac9db
NB		 2797 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2798 break;
2799 case RELEASE:
2800 case RELEASE_10:
2801 /*
2802 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2803 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2804 */
2805 if (cdb[0] == RELEASE_10)
2806 size = (cdb[7] << 8) | cdb[8];
2807 else
2808 size = cmd->data_length;
2809
e76a35d6 2810 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
6bb35e00 2811 cmd->execute_cmd = target_scsi2_reservation_release;
c66ac9db
NB		 2812 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2813 break;
2814 case SYNCHRONIZE_CACHE:
8e94b8db 2815 case SYNCHRONIZE_CACHE_16:
c66ac9db
NB		 2816 /*
2817 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2818 */
2819 if (cdb[0] == SYNCHRONIZE_CACHE) {
2820 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2821 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2822 } else {
2823 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2824 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2825 }
2826 if (sector_ret)
2827 goto out_unsupported_cdb;
2828
2829 size = transport_get_size(sectors, cdb, cmd);
2830 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2831
5bda90c8 2832 if (passthrough)
c66ac9db 2833 break;
5bda90c8 2834
c66ac9db
NB		 2835 /*
2836 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 2837 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 2838 */
7abbe7f3
NB		 2839 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2840 if (transport_cmd_get_valid_sectors(cmd) < 0)
2841 goto out_invalid_cdb_field;
2842 }
6bb35e00 2843 cmd->execute_cmd = target_emulate_synchronize_cache;
c66ac9db
NB		 2844 break;
2845 case UNMAP:
2846 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 2847 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2848 if (!passthrough)
6bb35e00 2849 cmd->execute_cmd = target_emulate_unmap;
c66ac9db
NB		 2850 break;
2851 case WRITE_SAME_16:
2852 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2853 if (sector_ret)
2854 goto out_unsupported_cdb;
dd3a5ad8 2855
6708bb27 2856 if (sectors)
12850626 2857 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2858 else {
2859 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2860 goto out_invalid_cdb_field;
2861 }
dd3a5ad8 2862
5db0753b 2863 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 2864 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2865
2866 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 2867 goto out_unsupported_cdb;
5bda90c8 2868 if (!passthrough)
6bb35e00 2869 cmd->execute_cmd = target_emulate_write_same;
706d5860
NB		 2870 break;
2871 case WRITE_SAME:
2872 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2873 if (sector_ret)
2874 goto out_unsupported_cdb;
2875
2876 if (sectors)
12850626 2877 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 2878 else {
2879 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2880 goto out_invalid_cdb_field;
c66ac9db 2881 }
706d5860
NB		 2882
2883 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 2884 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 2885 /*
2886 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2887 * of byte 1 bit 3 UNMAP instead of original reserved field
2888 */
2889 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 2890 goto out_unsupported_cdb;
5bda90c8 2891 if (!passthrough)
6bb35e00 2892 cmd->execute_cmd = target_emulate_write_same;
c66ac9db
NB		 2893 break;
2894 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 2895 case ERASE:
c66ac9db
NB		 2896 case REZERO_UNIT:
2897 case SEEK_10:
c66ac9db
NB		 2898 case SPACE:
2899 case START_STOP:
2900 case TEST_UNIT_READY:
2901 case VERIFY:
2902 case WRITE_FILEMARKS:
5bda90c8
CH		 2903 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2904 if (!passthrough)
6bb35e00 2905 cmd->execute_cmd = target_emulate_noop;
5bda90c8
CH		 2906 break;
2907 case GPCMD_CLOSE_TRACK:
2908 case INITIALIZE_ELEMENT_STATUS:
2909 case GPCMD_LOAD_UNLOAD:
2910 case GPCMD_SET_SPEED:
c66ac9db
NB		 2911 case MOVE_MEDIUM:
2912 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2913 break;
2914 case REPORT_LUNS:
6bb35e00 2915 cmd->execute_cmd = target_report_luns;
c66ac9db
NB		 2916 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2917 /*
2918 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2919 * See spc4r17 section 5.3
2920 */
5951146d 2921 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2922 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2923 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2924 break;
ed0b2144
SH		 2925 case GET_EVENT_STATUS_NOTIFICATION:
2926 size = (cdb[7] << 8) | cdb[8];
2927 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2928 break;
c66ac9db 2929 default:
6708bb27 2930 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 2931 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 2932 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 2933 goto out_unsupported_cdb;
2934 }
2935
b0d79946
SAS		 2936 if (cmd->unknown_data_length)
2937 cmd->data_length = size;
2938
c66ac9db 2939 if (size != cmd->data_length) {
6708bb27 2940 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 2941 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 2942 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 2943 cmd->data_length, size, cdb[0]);
2944
2945 cmd->cmd_spdtl = size;
2946
2947 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 2948 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 2949 " WRITE data\n");
2950 goto out_invalid_cdb_field;
2951 }
2952 /*
2953 * Reject READ_* or WRITE_* with overflow/underflow for
2954 * type SCF_SCSI_DATA_SG_IO_CDB.
2955 */
6708bb27
AG		 2956 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
2957 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 2958 " CDB on non 512-byte sector setup subsystem"
e3d6f909 2959 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 2960 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
2961 goto out_invalid_cdb_field;
2962 }
2963
2964 if (size > cmd->data_length) {
2965 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
2966 cmd->residual_count = (size - cmd->data_length);
2967 } else {
2968 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
2969 cmd->residual_count = (cmd->data_length - size);
2970 }
2971 cmd->data_length = size;
2972 }
2973
7b4deef5
NB		 2974 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
2975 if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
2976 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
2977 " big sectors %u exceeds fabric_max_sectors:"
2978 " %u\n", cdb[0], sectors,
2979 su_dev->se_dev_attrib.fabric_max_sectors);
2980 goto out_invalid_cdb_field;
2981 }
2982 if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
2983 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
2984 " big sectors %u exceeds backend hw_max_sectors:"
2985 " %u\n", cdb[0], sectors,
2986 su_dev->se_dev_attrib.hw_max_sectors);
2987 goto out_invalid_cdb_field;
2988 }
015487b8
RD		 2989 }
2990
5bda90c8 2991 /* reject any command that we don't have a handler for */
6bb35e00 2992 if (!(passthrough || cmd->execute_cmd ||
5bda90c8
CH		 2993 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2994 goto out_unsupported_cdb;
2995
c66ac9db
NB		 2996 transport_set_supported_SAM_opcode(cmd);
2997 return ret;
2998
2999out_unsupported_cdb:
3000 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3001 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3002 return -EINVAL;
c66ac9db
NB		 3003out_invalid_cdb_field:
3004 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3005 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3006 return -EINVAL;
c66ac9db
NB		 3007}
3008
c66ac9db 3009/*
35e0e757 3010 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3011 * and ordered cmds need to have their tasks added to the execution queue.
3012 */
3013static void transport_complete_task_attr(struct se_cmd *cmd)
3014{
5951146d 3015 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3016 struct se_cmd *cmd_p, *cmd_tmp;
3017 int new_active_tasks = 0;
3018
e66ecd50 3019 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3020 atomic_dec(&dev->simple_cmds);
3021 smp_mb__after_atomic_dec();
3022 dev->dev_cur_ordered_id++;
6708bb27 3023 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3024 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3025 cmd->se_ordered_id);
e66ecd50 3026 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3027 dev->dev_cur_ordered_id++;
6708bb27 3028 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3029 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3030 cmd->se_ordered_id);
e66ecd50 3031 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3032 atomic_dec(&dev->dev_ordered_sync);
3033 smp_mb__after_atomic_dec();
c66ac9db
NB		 3034
3035 dev->dev_cur_ordered_id++;
6708bb27 3036 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3037 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3038 }
3039 /*
3040 * Process all commands up to the last received
3041 * ORDERED task attribute which requires another blocking
3042 * boundary
3043 */
3044 spin_lock(&dev->delayed_cmd_lock);
3045 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3046 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3047
5951146d 3048 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3049 spin_unlock(&dev->delayed_cmd_lock);
3050
6708bb27 3051 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3052 " cmd_p: 0x%02x Task Attr: 0x%02x"
3053 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3054 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3055 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3056
cf572a96 3057 target_add_to_execute_list(cmd_p);
c66ac9db
NB		 3058 new_active_tasks++;
3059
3060 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3061 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3062 break;
3063 }
3064 spin_unlock(&dev->delayed_cmd_lock);
3065 /*
3066 * If new tasks have become active, wake up the transport thread
3067 * to do the processing of the Active tasks.
3068 */
3069 if (new_active_tasks != 0)
e3d6f909 3070 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3071}
3072
e057f533 3073static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3074{
3075 int ret = 0;
3076
e057f533
CH		 3077 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3078 transport_complete_task_attr(cmd);
3079
3080 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3081 ret = cmd->se_tfo->queue_status(cmd);
3082 if (ret)
3083 goto out;
3084 }
07bde79a
NB		 3085
3086 switch (cmd->data_direction) {
3087 case DMA_FROM_DEVICE:
3088 ret = cmd->se_tfo->queue_data_in(cmd);
3089 break;
3090 case DMA_TO_DEVICE:
ec98f782 3091 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3092 ret = cmd->se_tfo->queue_data_in(cmd);
3093 if (ret < 0)
e057f533 3094 break;
07bde79a
NB		 3095 }
3096 /* Fall through for DMA_TO_DEVICE */
3097 case DMA_NONE:
3098 ret = cmd->se_tfo->queue_status(cmd);
3099 break;
3100 default:
3101 break;
3102 }
3103
e057f533
CH		 3104out:
3105 if (ret < 0) {
3106 transport_handle_queue_full(cmd, cmd->se_dev);
3107 return;
3108 }
3109 transport_lun_remove_cmd(cmd);
3110 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3111}
3112
3113static void transport_handle_queue_full(
3114 struct se_cmd *cmd,
e057f533 3115 struct se_device *dev)
07bde79a
NB		 3116{
3117 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3118 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3119 atomic_inc(&dev->dev_qf_count);
3120 smp_mb__after_atomic_inc();
3121 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3122
3123 schedule_work(&cmd->se_dev->qf_work_queue);
3124}
3125
35e0e757 3126static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3127{
35e0e757 3128 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3129 int reason = 0, ret;
35e0e757 3130
c66ac9db
NB		 3131 /*
3132 * Check if we need to move delayed/dormant tasks from cmds on the
3133 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3134 * Attribute.
3135 */
5951146d 3136 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3137 transport_complete_task_attr(cmd);
07bde79a
NB		 3138 /*
3139 * Check to schedule QUEUE_FULL work, or execute an existing
3140 * cmd->transport_qf_callback()
3141 */
3142 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3143 schedule_work(&cmd->se_dev->qf_work_queue);
3144
c66ac9db
NB		 3145 /*
3146 * Check if we need to retrieve a sense buffer from
3147 * the struct se_cmd in question.
3148 */
3149 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3150 if (transport_get_sense_data(cmd) < 0)
3151 reason = TCM_NON_EXISTENT_LUN;
3152
c66ac9db 3153 if (cmd->scsi_status) {
07bde79a 3154 ret = transport_send_check_condition_and_sense(
c66ac9db 3155 cmd, reason, 1);
f147abb4 3156 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3157 goto queue_full;
3158
c66ac9db
NB		 3159 transport_lun_remove_cmd(cmd);
3160 transport_cmd_check_stop_to_fabric(cmd);
3161 return;
3162 }
3163 }
3164 /*
25985edc 3165 * Check for a callback, used by amongst other things
c66ac9db
NB		 3166 * XDWRITE_READ_10 emulation.
3167 */
3168 if (cmd->transport_complete_callback)
3169 cmd->transport_complete_callback(cmd);
3170
3171 switch (cmd->data_direction) {
3172 case DMA_FROM_DEVICE:
3173 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3174 if (cmd->se_lun->lun_sep) {
3175 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3176 cmd->data_length;
3177 }
3178 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3179
07bde79a 3180 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3181 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3182 goto queue_full;
c66ac9db
NB		 3183 break;
3184 case DMA_TO_DEVICE:
3185 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3186 if (cmd->se_lun->lun_sep) {
3187 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3188 cmd->data_length;
3189 }
3190 spin_unlock(&cmd->se_lun->lun_sep_lock);
3191 /*
3192 * Check if we need to send READ payload for BIDI-COMMAND
3193 */
ec98f782 3194 if (cmd->t_bidi_data_sg) {
c66ac9db 3195 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3196 if (cmd->se_lun->lun_sep) {
3197 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3198 cmd->data_length;
3199 }
3200 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3201 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3202 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3203 goto queue_full;
c66ac9db
NB		 3204 break;
3205 }
3206 /* Fall through for DMA_TO_DEVICE */
3207 case DMA_NONE:
07bde79a 3208 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3209 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3210 goto queue_full;
c66ac9db
NB		 3211 break;
3212 default:
3213 break;
3214 }
3215
3216 transport_lun_remove_cmd(cmd);
3217 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3218 return;
3219
3220queue_full:
6708bb27 3221 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3222 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3223 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3224 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3225}
3226
6708bb27 3227static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3228{
ec98f782 3229 struct scatterlist *sg;
ec98f782 3230 int count;
c66ac9db 3231
6708bb27
AG		 3232 for_each_sg(sgl, sg, nents, count)
3233 __free_page(sg_page(sg));
c66ac9db 3234
6708bb27
AG		 3235 kfree(sgl);
3236}
c66ac9db 3237
6708bb27
AG		 3238static inline void transport_free_pages(struct se_cmd *cmd)
3239{
3240 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3241 return;
3242
3243 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3244 cmd->t_data_sg = NULL;
3245 cmd->t_data_nents = 0;
c66ac9db 3246
6708bb27 3247 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3248 cmd->t_bidi_data_sg = NULL;
3249 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3250}
3251
e26d99ae
CH		 3252/**
3253 * transport_release_cmd - free a command
3254 * @cmd: command to free
3255 *
3256 * This routine unconditionally frees a command, and reference counting
3257 * or list removal must be done in the caller.
3258 */
3259static void transport_release_cmd(struct se_cmd *cmd)
3260{
3261 BUG_ON(!cmd->se_tfo);
3262
c8e31f26 3263 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 3264 core_tmr_release_req(cmd->se_tmr_req);
3265 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3266 kfree(cmd->t_task_cdb);
3267 /*
7481deb4
NB		 3268 * If this cmd has been setup with target_get_sess_cmd(), drop
3269 * the kref and call ->release_cmd() in kref callback.
e26d99ae 3270 */
7481deb4
NB		 3271 if (cmd->check_release != 0) {
3272 target_put_sess_cmd(cmd->se_sess, cmd);
3273 return;
3274 }
e26d99ae
CH		 3275 cmd->se_tfo->release_cmd(cmd);
3276}
3277
d3df7825
CH		 3278/**
3279 * transport_put_cmd - release a reference to a command
3280 * @cmd: command to release
3281 *
3282 * This routine releases our reference to the command and frees it if possible.
3283 */
39c05f32 3284static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3285{
3286 unsigned long flags;
c66ac9db 3287
a1d8b49a 3288 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3289 if (atomic_read(&cmd->t_fe_count)) {
3290 if (!atomic_dec_and_test(&cmd->t_fe_count))
3291 goto out_busy;
3292 }
3293
7d680f3b
CH		 3294 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3295 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 3296 target_remove_from_state_list(cmd);
c66ac9db 3297 }
a1d8b49a 3298 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3299
c66ac9db 3300 transport_free_pages(cmd);
31afc39c 3301 transport_release_cmd(cmd);
39c05f32 3302 return;
4911e3cc
CH		 3303out_busy:
3304 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3305}
3306
c66ac9db 3307/*
ec98f782
AG		 3308 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3309 * allocating in the core.
c66ac9db
NB		 3310 * @cmd: Associated se_cmd descriptor
3311 * @mem: SGL style memory for TCM WRITE / READ
3312 * @sg_mem_num: Number of SGL elements
3313 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3314 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3315 *
3316 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3317 * of parameters.
3318 */
3319int transport_generic_map_mem_to_cmd(
3320 struct se_cmd *cmd,
5951146d
AG		 3321 struct scatterlist *sgl,
3322 u32 sgl_count,
3323 struct scatterlist *sgl_bidi,
3324 u32 sgl_bidi_count)
c66ac9db 3325{
5951146d 3326 if (!sgl || !sgl_count)
c66ac9db 3327 return 0;
c66ac9db 3328
c66ac9db
NB		 3329 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3330 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
fef58a60
NB		 3331 /*
3332 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3333 * scatterlists already have been set to follow what the fabric
3334 * passes for the original expected data transfer length.
3335 */
3336 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3337 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3338 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3339 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3340 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3341 return -EINVAL;
3342 }
c66ac9db 3343
ec98f782
AG		 3344 cmd->t_data_sg = sgl;
3345 cmd->t_data_nents = sgl_count;
c66ac9db 3346
ec98f782
AG		 3347 if (sgl_bidi && sgl_bidi_count) {
3348 cmd->t_bidi_data_sg = sgl_bidi;
3349 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3350 }
3351 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3352 }
3353
3354 return 0;
3355}
3356EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3357
4949314c 3358void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3359{
ec98f782 3360 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 3361 struct page **pages;
3362 int i;
05d1c7c0 3363
ec98f782 3364 BUG_ON(!sg);
05d1c7c0 3365 /*
ec98f782
AG		 3366 * We need to take into account a possible offset here for fabrics like
3367 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3368 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3369 */
4949314c
AG		 3370 if (!cmd->t_data_nents)
3371 return NULL;
3372 else if (cmd->t_data_nents == 1)
3373 return kmap(sg_page(sg)) + sg->offset;
3374
3375 /* >1 page. use vmap */
3376 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3377 if (!pages)
3378 return NULL;
3379
3380 /* convert sg[] to pages[] */
3381 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3382 pages[i] = sg_page(sg);
3383 }
3384
3385 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
3386 kfree(pages);
3387 if (!cmd->t_data_vmap)
3388 return NULL;
3389
3390 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 3391}
4949314c 3392EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 3393
4949314c 3394void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3395{
a1edf9cf 3396 if (!cmd->t_data_nents) {
4949314c 3397 return;
a1edf9cf 3398 } else if (cmd->t_data_nents == 1) {
4949314c 3399 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 3400 return;
3401 }
4949314c
AG		 3402
3403 vunmap(cmd->t_data_vmap);
3404 cmd->t_data_vmap = NULL;
05d1c7c0 3405}
4949314c 3406EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 3407
c66ac9db 3408static int
05d1c7c0 3409transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3410{
ec98f782
AG		 3411 u32 length = cmd->data_length;
3412 unsigned int nents;
3413 struct page *page;
9db9da33 3414 gfp_t zero_flag;
ec98f782 3415 int i = 0;
c66ac9db 3416
ec98f782
AG		 3417 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3418 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3419 if (!cmd->t_data_sg)
3420 return -ENOMEM;
c66ac9db 3421
ec98f782
AG		 3422 cmd->t_data_nents = nents;
3423 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3424
9db9da33 3425 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3426
ec98f782
AG		 3427 while (length) {
3428 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 3429 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 3430 if (!page)
3431 goto out;
c66ac9db 3432
ec98f782
AG		 3433 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3434 length -= page_len;
3435 i++;
c66ac9db 3436 }
c66ac9db 3437 return 0;
c66ac9db 3438
ec98f782
AG		 3439out:
3440 while (i >= 0) {
3441 __free_page(sg_page(&cmd->t_data_sg[i]));
3442 i--;
c66ac9db 3443 }
ec98f782
AG		 3444 kfree(cmd->t_data_sg);
3445 cmd->t_data_sg = NULL;
3446 return -ENOMEM;
c66ac9db
NB		 3447}
3448
da0f7619 3449/*
b16a35b0
AG		 3450 * Allocate any required resources to execute the command. For writes we
3451 * might not have the payload yet, so notify the fabric via a call to
3452 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 3453 */
a1d8b49a 3454int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3455{
da0f7619 3456 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3457 int ret = 0;
3458
3459 /*
3460 * Determine is the TCM fabric module has already allocated physical
3461 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3462 * beforehand.
c66ac9db 3463 */
ec98f782
AG		 3464 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3465 cmd->data_length) {
05d1c7c0 3466 ret = transport_generic_get_mem(cmd);
c66ac9db 3467 if (ret < 0)
03e98c9e 3468 goto out_fail;
c66ac9db 3469 }
da0f7619 3470
4101f0a8
CH		 3471 /* Workaround for handling zero-length control CDBs */
3472 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3473 !cmd->data_length) {
7d680f3b 3474 spin_lock_irq(&cmd->t_state_lock);
410f6702 3475 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 3476 cmd->transport_state |= CMD_T_ACTIVE;
3477 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 3478
3479 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3480 u8 ua_asc = 0, ua_ascq = 0;
3481
3482 core_scsi3_ua_clear_for_request_sense(cmd,
3483 &ua_asc, &ua_ascq);
3484 }
3485
410f6702
RD		 3486 INIT_WORK(&cmd->work, target_complete_ok_work);
3487 queue_work(target_completion_wq, &cmd->work);
3488 return 0;
3489 }
da0f7619 3490
4101f0a8
CH		 3491 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3492 struct se_dev_attrib *attr = &dev->se_sub_dev->se_dev_attrib;
3493
3494 if (transport_cmd_get_valid_sectors(cmd) < 0)
3495 return -EINVAL;
3496
3497 BUG_ON(cmd->data_length % attr->block_size);
3498 BUG_ON(DIV_ROUND_UP(cmd->data_length, attr->block_size) >
11e764bd 3499 attr->hw_max_sectors);
da0f7619
CH		 3500 }
3501
4101f0a8 3502 atomic_inc(&cmd->t_fe_count);
4101f0a8 3503
c66ac9db 3504 /*
5787cacd
CH		 3505 * For WRITEs, let the fabric know its buffer is ready.
3506 *
3507 * The command will be added to the execution queue after its write
3508 * data has arrived.
c66ac9db
NB		 3509 */
3510 if (cmd->data_direction == DMA_TO_DEVICE) {
cf572a96 3511 target_add_to_state_list(cmd);
c66ac9db
NB		 3512 return transport_generic_write_pending(cmd);
3513 }
3514 /*
5787cacd 3515 * Everything else but a WRITE, add the command to the execution queue.
c66ac9db
NB		 3516 */
3517 transport_execute_tasks(cmd);
3518 return 0;
da0f7619
CH		 3519
3520out_fail:
3521 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3522 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3523 return -EINVAL;
c66ac9db 3524}
a1d8b49a 3525EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3526
3527/* transport_generic_process_write():
3528 *
3529 *
3530 */
3531void transport_generic_process_write(struct se_cmd *cmd)
3532{
c66ac9db
NB		 3533 transport_execute_tasks(cmd);
3534}
3535EXPORT_SYMBOL(transport_generic_process_write);
3536
e057f533 3537static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3538{
f147abb4
NB		 3539 int ret;
3540
3541 ret = cmd->se_tfo->write_pending(cmd);
3542 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3543 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3544 cmd);
3545 transport_handle_queue_full(cmd, cmd->se_dev);
3546 }
07bde79a
NB		 3547}
3548
c66ac9db
NB		 3549static int transport_generic_write_pending(struct se_cmd *cmd)
3550{
3551 unsigned long flags;
3552 int ret;
3553
a1d8b49a 3554 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3555 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3556 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3557
c66ac9db
NB		 3558 /*
3559 * Clear the se_cmd for WRITE_PENDING status in order to set
7d680f3b
CH		 3560 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3561 * from HW target mode interrupt code. This is safe to be called
3562 * with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3563 * because the se_cmd->se_lun pointer is not being cleared.
3564 */
3565 transport_cmd_check_stop(cmd, 1, 0);
3566
3567 /*
3568 * Call the fabric write_pending function here to let the
3569 * frontend know that WRITE buffers are ready.
3570 */
e3d6f909 3571 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3572 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3573 goto queue_full;
3574 else if (ret < 0)
c66ac9db
NB		 3575 return ret;
3576
03e98c9e 3577 return 1;
07bde79a
NB		 3578
3579queue_full:
6708bb27 3580 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3581 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3582 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3583 return 0;
c66ac9db
NB		 3584}
3585
39c05f32 3586void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3587{
d14921d6 3588 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 3589 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 3590 transport_wait_for_tasks(cmd);
3591
35462975 3592 transport_release_cmd(cmd);
d14921d6
NB		 3593 } else {
3594 if (wait_for_tasks)
3595 transport_wait_for_tasks(cmd);
3596
c66ac9db
NB		 3597 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3598
82f1c8a4 3599 if (cmd->se_lun)
c66ac9db 3600 transport_lun_remove_cmd(cmd);
c66ac9db 3601
39c05f32 3602 transport_put_cmd(cmd);
c66ac9db
NB		 3603 }
3604}
3605EXPORT_SYMBOL(transport_generic_free_cmd);
3606
a17f091d
NB		 3607/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3608 * @se_sess: session to reference
3609 * @se_cmd: command descriptor to add
a6360785 3610 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 3611 */
a6360785
NB		 3612void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3613 bool ack_kref)
a17f091d
NB		 3614{
3615 unsigned long flags;
3616
7481deb4 3617 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 3618 /*
3619 * Add a second kref if the fabric caller is expecting to handle
3620 * fabric acknowledgement that requires two target_put_sess_cmd()
3621 * invocations before se_cmd descriptor release.
3622 */
86715569 3623 if (ack_kref == true) {
a6360785 3624 kref_get(&se_cmd->cmd_kref);
86715569
NB		 3625 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
3626 }
7481deb4 3627
a17f091d
NB		 3628 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3629 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3630 se_cmd->check_release = 1;
3631 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3632}
3633EXPORT_SYMBOL(target_get_sess_cmd);
3634
7481deb4 3635static void target_release_cmd_kref(struct kref *kref)
a17f091d 3636{
7481deb4
NB		 3637 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3638 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 3639 unsigned long flags;
3640
3641 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3642 if (list_empty(&se_cmd->se_cmd_list)) {
3643 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 3644 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 3645 return;
a17f091d 3646 }
a17f091d
NB		 3647 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3648 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3649 complete(&se_cmd->cmd_wait_comp);
7481deb4 3650 return;
a17f091d
NB		 3651 }
3652 list_del(&se_cmd->se_cmd_list);
3653 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3654
7481deb4
NB		 3655 se_cmd->se_tfo->release_cmd(se_cmd);
3656}
3657
3658/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
3659 * @se_sess: session to reference
3660 * @se_cmd: command descriptor to drop
3661 */
3662int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3663{
3664 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 3665}
3666EXPORT_SYMBOL(target_put_sess_cmd);
3667
3668/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3669 * @se_sess: session to split
3670 */
3671void target_splice_sess_cmd_list(struct se_session *se_sess)
3672{
3673 struct se_cmd *se_cmd;
3674 unsigned long flags;
3675
3676 WARN_ON(!list_empty(&se_sess->sess_wait_list));
3677 INIT_LIST_HEAD(&se_sess->sess_wait_list);
3678
3679 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3680 se_sess->sess_tearing_down = 1;
3681
3682 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3683
3684 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3685 se_cmd->cmd_wait_set = 1;
3686
3687 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3688}
3689EXPORT_SYMBOL(target_splice_sess_cmd_list);
3690
3691/* target_wait_for_sess_cmds - Wait for outstanding descriptors
3692 * @se_sess: session to wait for active I/O
3693 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3694 */
3695void target_wait_for_sess_cmds(
3696 struct se_session *se_sess,
3697 int wait_for_tasks)
3698{
3699 struct se_cmd *se_cmd, *tmp_cmd;
3700 bool rc = false;
3701
3702 list_for_each_entry_safe(se_cmd, tmp_cmd,
3703 &se_sess->sess_wait_list, se_cmd_list) {
3704 list_del(&se_cmd->se_cmd_list);
3705
3706 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3707 " %d\n", se_cmd, se_cmd->t_state,
3708 se_cmd->se_tfo->get_cmd_state(se_cmd));
3709
3710 if (wait_for_tasks) {
3711 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3712 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3713 se_cmd->se_tfo->get_cmd_state(se_cmd));
3714
3715 rc = transport_wait_for_tasks(se_cmd);
3716
3717 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3718 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3719 se_cmd->se_tfo->get_cmd_state(se_cmd));
3720 }
3721
3722 if (!rc) {
3723 wait_for_completion(&se_cmd->cmd_wait_comp);
3724 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
3725 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3726 se_cmd->se_tfo->get_cmd_state(se_cmd));
3727 }
3728
3729 se_cmd->se_tfo->release_cmd(se_cmd);
3730 }
3731}
3732EXPORT_SYMBOL(target_wait_for_sess_cmds);
3733
c66ac9db
NB		 3734/* transport_lun_wait_for_tasks():
3735 *
3736 * Called from ConfigFS context to stop the passed struct se_cmd to allow
3737 * an struct se_lun to be successfully shutdown.
3738 */
3739static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
3740{
3741 unsigned long flags;
cf572a96
CH		 3742 int ret = 0;
3743
c66ac9db
NB		 3744 /*
3745 * If the frontend has already requested this struct se_cmd to
3746 * be stopped, we can safely ignore this struct se_cmd.
3747 */
a1d8b49a 3748 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 3749 if (cmd->transport_state & CMD_T_STOP) {
3750 cmd->transport_state &= ~CMD_T_LUN_STOP;
3751
3752 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
3753 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 3754 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3755 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 3756 return -EPERM;
c66ac9db 3757 }
7d680f3b 3758 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 3759 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3760
5951146d 3761 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 3762
cf572a96
CH		 3763 // XXX: audit task_flags checks.
3764 spin_lock_irqsave(&cmd->t_state_lock, flags);
3765 if ((cmd->transport_state & CMD_T_BUSY) &&
3766 (cmd->transport_state & CMD_T_SENT)) {
3767 if (!target_stop_cmd(cmd, &flags))
3768 ret++;
23019170 3769 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96
CH		 3770 } else {
3771 spin_unlock_irqrestore(&cmd->t_state_lock,
3772 flags);
3773 target_remove_from_execute_list(cmd);
3774 }
c66ac9db 3775
785fdf70
CH		 3776 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
3777 " %d\n", cmd, ret);
c66ac9db 3778 if (!ret) {
6708bb27 3779 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 3780 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 3781 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 3782 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 3783 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3784 }
3df8d40b 3785 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 3786
3787 return 0;
3788}
3789
c66ac9db
NB		 3790static void __transport_clear_lun_from_sessions(struct se_lun *lun)
3791{
3792 struct se_cmd *cmd = NULL;
3793 unsigned long lun_flags, cmd_flags;
3794 /*
3795 * Do exception processing and return CHECK_CONDITION status to the
3796 * Initiator Port.
3797 */
3798 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 3799 while (!list_empty(&lun->lun_cmd_list)) {
3800 cmd = list_first_entry(&lun->lun_cmd_list,
3801 struct se_cmd, se_lun_node);
3d26fea0 3802 list_del_init(&cmd->se_lun_node);
5951146d 3803
c66ac9db
NB		 3804 /*
3805 * This will notify iscsi_target_transport.c:
3806 * transport_cmd_check_stop() that a LUN shutdown is in
3807 * progress for the iscsi_cmd_t.
3808 */
a1d8b49a 3809 spin_lock(&cmd->t_state_lock);
6708bb27 3810 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 3811 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 3812 cmd->se_lun->unpacked_lun,
3813 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 3814 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 3815 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 3816
3817 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3818
6708bb27
AG		 3819 if (!cmd->se_lun) {
3820 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 3821 cmd->se_tfo->get_task_tag(cmd),
3822 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 3823 BUG();
3824 }
3825 /*
3826 * If the Storage engine still owns the iscsi_cmd_t, determine
3827 * and/or stop its context.
3828 */
6708bb27 3829 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 3830 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
3831 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3832
e3d6f909 3833 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 3834 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3835 continue;
3836 }
3837
6708bb27 3838 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 3839 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 3840 cmd->se_lun->unpacked_lun,
3841 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3842
a1d8b49a 3843 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 3844 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 3845 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 3846 goto check_cond;
3847 }
7d680f3b 3848 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 3849 target_remove_from_state_list(cmd);
a1d8b49a 3850 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 3851
c66ac9db
NB		 3852 /*
3853 * The Storage engine stopped this struct se_cmd before it was
3854 * send to the fabric frontend for delivery back to the
3855 * Initiator Node. Return this SCSI CDB back with an
3856 * CHECK_CONDITION status.
3857 */
3858check_cond:
3859 transport_send_check_condition_and_sense(cmd,
3860 TCM_NON_EXISTENT_LUN, 0);
3861 /*
3862 * If the fabric frontend is waiting for this iscsi_cmd_t to
3863 * be released, notify the waiting thread now that LU has
3864 * finished accessing it.
3865 */
a1d8b49a 3866 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 3867 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 3868 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 3869 " struct se_cmd: %p ITT: 0x%08x\n",
3870 lun->unpacked_lun,
e3d6f909 3871 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3872
a1d8b49a 3873 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3874 cmd_flags);
3875 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 3876 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 3877 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3878 continue;
3879 }
6708bb27 3880 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 3881 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3882
a1d8b49a 3883 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 3884 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3885 }
3886 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3887}
3888
3889static int transport_clear_lun_thread(void *p)
3890{
8359cf43 3891 struct se_lun *lun = p;
c66ac9db
NB		 3892
3893 __transport_clear_lun_from_sessions(lun);
3894 complete(&lun->lun_shutdown_comp);
3895
3896 return 0;
3897}
3898
3899int transport_clear_lun_from_sessions(struct se_lun *lun)
3900{
3901 struct task_struct *kt;
3902
5951146d 3903 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 3904 "tcm_cl_%u", lun->unpacked_lun);
3905 if (IS_ERR(kt)) {
6708bb27 3906 pr_err("Unable to start clear_lun thread\n");
e3d6f909 3907 return PTR_ERR(kt);
c66ac9db
NB		 3908 }
3909 wait_for_completion(&lun->lun_shutdown_comp);
3910
3911 return 0;
3912}
3913
d14921d6
NB		 3914/**
3915 * transport_wait_for_tasks - wait for completion to occur
3916 * @cmd: command to wait
c66ac9db 3917 *
d14921d6
NB		 3918 * Called from frontend fabric context to wait for storage engine
3919 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 3920 */
a17f091d 3921bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 3922{
3923 unsigned long flags;
3924
a1d8b49a 3925 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 3926 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
3927 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 3928 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 3929 return false;
d14921d6
NB		 3930 }
3931 /*
3932 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
3933 * has been set in transport_set_supported_SAM_opcode().
3934 */
c8e31f26
AG		 3935 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
3936 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 3937 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 3938 return false;
d14921d6 3939 }
c66ac9db
NB		 3940 /*
3941 * If we are already stopped due to an external event (ie: LUN shutdown)
3942 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 3943 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 3944 * transport_clear_lun_from_sessions() once the ConfigFS context caller
3945 * has completed its operation on the struct se_cmd.
3946 */
7d680f3b 3947 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 3948 pr_debug("wait_for_tasks: Stopping"
e3d6f909 3949 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 3950 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 3951 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 3952 /*
3953 * There is a special case for WRITES where a FE exception +
3954 * LUN shutdown means ConfigFS context is still sleeping on
3955 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
3956 * We go ahead and up transport_lun_stop_comp just to be sure
3957 * here.
3958 */
a1d8b49a
AG		 3959 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3960 complete(&cmd->transport_lun_stop_comp);
3961 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
3962 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3963
cf572a96 3964 target_remove_from_state_list(cmd);
c66ac9db
NB		 3965 /*
3966 * At this point, the frontend who was the originator of this
3967 * struct se_cmd, now owns the structure and can be released through
3968 * normal means below.
3969 */
6708bb27 3970 pr_debug("wait_for_tasks: Stopped"
e3d6f909 3971 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 3972 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 3973 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3974
7d680f3b 3975 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 3976 }
7d680f3b 3977
3d28934a 3978 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 3979 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 3980 return false;
d14921d6 3981 }
c66ac9db 3982
7d680f3b 3983 cmd->transport_state |= CMD_T_STOP;
c66ac9db 3984
6708bb27 3985 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 3986 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 3987 cmd, cmd->se_tfo->get_task_tag(cmd),
3988 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 3989
a1d8b49a 3990 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3991
5951146d 3992 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 3993
a1d8b49a 3994 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 3995
a1d8b49a 3996 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 3997 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 3998
6708bb27 3999 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4000 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4001 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4002
d14921d6 4003 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4004
4005 return true;
c66ac9db 4006}
d14921d6 4007EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4008
4009static int transport_get_sense_codes(
4010 struct se_cmd *cmd,
4011 u8 *asc,
4012 u8 *ascq)
4013{
4014 *asc = cmd->scsi_asc;
4015 *ascq = cmd->scsi_ascq;
4016
4017 return 0;
4018}
4019
4020static int transport_set_sense_codes(
4021 struct se_cmd *cmd,
4022 u8 asc,
4023 u8 ascq)
4024{
4025 cmd->scsi_asc = asc;
4026 cmd->scsi_ascq = ascq;
4027
4028 return 0;
4029}
4030
4031int transport_send_check_condition_and_sense(
4032 struct se_cmd *cmd,
4033 u8 reason,
4034 int from_transport)
4035{
4036 unsigned char *buffer = cmd->sense_buffer;
4037 unsigned long flags;
4038 int offset;
4039 u8 asc = 0, ascq = 0;
4040
a1d8b49a 4041 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4042 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4043 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4044 return 0;
4045 }
4046 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4047 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4048
4049 if (!reason && from_transport)
4050 goto after_reason;
4051
4052 if (!from_transport)
4053 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4054 /*
4055 * Data Segment and SenseLength of the fabric response PDU.
4056 *
4057 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4058 * from include/scsi/scsi_cmnd.h
4059 */
e3d6f909 4060 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4061 TRANSPORT_SENSE_BUFFER);
4062 /*
4063 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4064 * SENSE KEY values from include/scsi/scsi.h
4065 */
4066 switch (reason) {
4067 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4068 /* CURRENT ERROR */
4069 buffer[offset] = 0x70;
895f3022 4070 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 4071 /* ILLEGAL REQUEST */
4072 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4073 /* LOGICAL UNIT NOT SUPPORTED */
4074 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4075 break;
c66ac9db
NB		 4076 case TCM_UNSUPPORTED_SCSI_OPCODE:
4077 case TCM_SECTOR_COUNT_TOO_MANY:
4078 /* CURRENT ERROR */
4079 buffer[offset] = 0x70;
895f3022 4080 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4081 /* ILLEGAL REQUEST */
4082 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4083 /* INVALID COMMAND OPERATION CODE */
4084 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4085 break;
4086 case TCM_UNKNOWN_MODE_PAGE:
4087 /* CURRENT ERROR */
4088 buffer[offset] = 0x70;
895f3022 4089 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4090 /* ILLEGAL REQUEST */
4091 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4092 /* INVALID FIELD IN CDB */
4093 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4094 break;
4095 case TCM_CHECK_CONDITION_ABORT_CMD:
4096 /* CURRENT ERROR */
4097 buffer[offset] = 0x70;
895f3022 4098 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4099 /* ABORTED COMMAND */
4100 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4101 /* BUS DEVICE RESET FUNCTION OCCURRED */
4102 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4103 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4104 break;
4105 case TCM_INCORRECT_AMOUNT_OF_DATA:
4106 /* CURRENT ERROR */
4107 buffer[offset] = 0x70;
895f3022 4108 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4109 /* ABORTED COMMAND */
4110 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4111 /* WRITE ERROR */
4112 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4113 /* NOT ENOUGH UNSOLICITED DATA */
4114 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4115 break;
4116 case TCM_INVALID_CDB_FIELD:
4117 /* CURRENT ERROR */
4118 buffer[offset] = 0x70;
895f3022 4119 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4120 /* ILLEGAL REQUEST */
4121 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4122 /* INVALID FIELD IN CDB */
4123 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4124 break;
4125 case TCM_INVALID_PARAMETER_LIST:
4126 /* CURRENT ERROR */
4127 buffer[offset] = 0x70;
895f3022 4128 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4129 /* ILLEGAL REQUEST */
4130 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4131 /* INVALID FIELD IN PARAMETER LIST */
4132 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4133 break;
4134 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4135 /* CURRENT ERROR */
4136 buffer[offset] = 0x70;
895f3022 4137 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4138 /* ABORTED COMMAND */
4139 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4140 /* WRITE ERROR */
4141 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4142 /* UNEXPECTED_UNSOLICITED_DATA */
4143 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4144 break;
4145 case TCM_SERVICE_CRC_ERROR:
4146 /* CURRENT ERROR */
4147 buffer[offset] = 0x70;
895f3022 4148 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4149 /* ABORTED COMMAND */
4150 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4151 /* PROTOCOL SERVICE CRC ERROR */
4152 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4153 /* N/A */
4154 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4155 break;
4156 case TCM_SNACK_REJECTED:
4157 /* CURRENT ERROR */
4158 buffer[offset] = 0x70;
895f3022 4159 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4160 /* ABORTED COMMAND */
4161 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4162 /* READ ERROR */
4163 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4164 /* FAILED RETRANSMISSION REQUEST */
4165 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4166 break;
4167 case TCM_WRITE_PROTECTED:
4168 /* CURRENT ERROR */
4169 buffer[offset] = 0x70;
895f3022 4170 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4171 /* DATA PROTECT */
4172 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4173 /* WRITE PROTECTED */
4174 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4175 break;
4176 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4177 /* CURRENT ERROR */
4178 buffer[offset] = 0x70;
895f3022 4179 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4180 /* UNIT ATTENTION */
4181 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4182 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4183 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4184 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4185 break;
4186 case TCM_CHECK_CONDITION_NOT_READY:
4187 /* CURRENT ERROR */
4188 buffer[offset] = 0x70;
895f3022 4189 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4190 /* Not Ready */
4191 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4192 transport_get_sense_codes(cmd, &asc, &ascq);
4193 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4194 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4195 break;
4196 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4197 default:
4198 /* CURRENT ERROR */
4199 buffer[offset] = 0x70;
895f3022 4200 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4201 /* ILLEGAL REQUEST */
4202 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4203 /* LOGICAL UNIT COMMUNICATION FAILURE */
4204 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4205 break;
4206 }
4207 /*
4208 * This code uses linux/include/scsi/scsi.h SAM status codes!
4209 */
4210 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4211 /*
4212 * Automatically padded, this value is encoded in the fabric's
4213 * data_length response PDU containing the SCSI defined sense data.
4214 */
4215 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4216
4217after_reason:
07bde79a 4218 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4219}
4220EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4221
4222int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4223{
4224 int ret = 0;
4225
7d680f3b 4226 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 4227 if (!send_status ||
c66ac9db
NB		 4228 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4229 return 1;
8b1e1244 4230
6708bb27 4231 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4232 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4233 cmd->t_task_cdb[0],
e3d6f909 4234 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 4235
c66ac9db 4236 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4237 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4238 ret = 1;
4239 }
4240 return ret;
4241}
4242EXPORT_SYMBOL(transport_check_aborted_status);
4243
4244void transport_send_task_abort(struct se_cmd *cmd)
4245{
c252f003
NB		 4246 unsigned long flags;
4247
4248 spin_lock_irqsave(&cmd->t_state_lock, flags);
4249 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4250 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4251 return;
4252 }
4253 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4254
c66ac9db
NB		 4255 /*
4256 * If there are still expected incoming fabric WRITEs, we wait
4257 * until until they have completed before sending a TASK_ABORTED
4258 * response. This response with TASK_ABORTED status will be
4259 * queued back to fabric module by transport_check_aborted_status().
4260 */
4261 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4262 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 4263 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 4264 smp_mb__after_atomic_inc();
c66ac9db
NB		 4265 }
4266 }
4267 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 4268
6708bb27 4269 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4270 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4271 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 4272
e3d6f909 4273 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4274}
4275
e26d99ae 4276static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4277{
5951146d 4278 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4279 struct se_tmr_req *tmr = cmd->se_tmr_req;
4280 int ret;
4281
4282 switch (tmr->function) {
5c6cd613 4283 case TMR_ABORT_TASK:
3d28934a 4284 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 4285 break;
5c6cd613
NB		 4286 case TMR_ABORT_TASK_SET:
4287 case TMR_CLEAR_ACA:
4288 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4289 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4290 break;
5c6cd613 4291 case TMR_LUN_RESET:
c66ac9db
NB		 4292 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4293 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4294 TMR_FUNCTION_REJECTED;
4295 break;
5c6cd613 4296 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4297 tmr->response = TMR_FUNCTION_REJECTED;
4298 break;
5c6cd613 4299 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4300 tmr->response = TMR_FUNCTION_REJECTED;
4301 break;
c66ac9db 4302 default:
6708bb27 4303 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4304 tmr->function);
4305 tmr->response = TMR_FUNCTION_REJECTED;
4306 break;
4307 }
4308
4309 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4310 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4311
b7b8bef7 4312 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4313 return 0;
4314}
4315
c66ac9db
NB		 4316/* transport_processing_thread():
4317 *
4318 *
4319 */
4320static int transport_processing_thread(void *param)
4321{
5951146d 4322 int ret;
c66ac9db 4323 struct se_cmd *cmd;
8359cf43 4324 struct se_device *dev = param;
c66ac9db 4325
c66ac9db 4326 while (!kthread_should_stop()) {
e3d6f909
AG		 4327 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4328 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4329 kthread_should_stop());
4330 if (ret < 0)
4331 goto out;
4332
c66ac9db 4333get_cmd:
5951146d
AG		 4334 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4335 if (!cmd)
c66ac9db
NB		 4336 continue;
4337
5951146d 4338 switch (cmd->t_state) {
680b73c5
CH		 4339 case TRANSPORT_NEW_CMD:
4340 BUG();
4341 break;
c66ac9db 4342 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4343 if (!cmd->se_tfo->new_cmd_map) {
4344 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4345 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4346 BUG();
4347 }
e3d6f909 4348 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4349 if (ret < 0) {
03e98c9e 4350 transport_generic_request_failure(cmd);
c66ac9db
NB		 4351 break;
4352 }
c66ac9db 4353 ret = transport_generic_new_cmd(cmd);
f147abb4 4354 if (ret < 0) {
03e98c9e
NB		 4355 transport_generic_request_failure(cmd);
4356 break;
c66ac9db
NB		 4357 }
4358 break;
4359 case TRANSPORT_PROCESS_WRITE:
4360 transport_generic_process_write(cmd);
4361 break;
c66ac9db
NB		 4362 case TRANSPORT_PROCESS_TMR:
4363 transport_generic_do_tmr(cmd);
4364 break;
07bde79a 4365 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4366 transport_write_pending_qf(cmd);
4367 break;
4368 case TRANSPORT_COMPLETE_QF_OK:
4369 transport_complete_qf(cmd);
07bde79a 4370 break;
c66ac9db 4371 default:
f2da9dbd
CH		 4372 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4373 "i_state: %d on SE LUN: %u\n",
4374 cmd->t_state,
e3d6f909
AG		 4375 cmd->se_tfo->get_task_tag(cmd),
4376 cmd->se_tfo->get_cmd_state(cmd),
4377 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4378 BUG();
4379 }
4380
4381 goto get_cmd;
4382 }
4383
4384out:
cf572a96 4385 WARN_ON(!list_empty(&dev->state_list));
ce8762f6 4386 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4387 dev->process_thread = NULL;
4388 return 0;
4389}
Linux kernel - Deliverables
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