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target: cleanup transport_execute_tasks()
[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
333int target_put_session(struct se_session *se_sess)
334{
335 return kref_put(&se_sess->sess_kref, target_release_session);
336}
337EXPORT_SYMBOL(target_put_session);
338
afb999ff
NB		 339static void target_complete_nacl(struct kref *kref)
340{
341 struct se_node_acl *nacl = container_of(kref,
342 struct se_node_acl, acl_kref);
343
344 complete(&nacl->acl_free_comp);
345}
346
347void target_put_nacl(struct se_node_acl *nacl)
348{
349 kref_put(&nacl->acl_kref, target_complete_nacl);
350}
351
c66ac9db
NB		 352void transport_deregister_session_configfs(struct se_session *se_sess)
353{
354 struct se_node_acl *se_nacl;
23388864 355 unsigned long flags;
c66ac9db
NB		 356 /*
357 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
358 */
359 se_nacl = se_sess->se_node_acl;
6708bb27 360 if (se_nacl) {
23388864 361 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 362 if (se_nacl->acl_stop == 0)
363 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 364 /*
365 * If the session list is empty, then clear the pointer.
366 * Otherwise, set the struct se_session pointer from the tail
367 * element of the per struct se_node_acl active session list.
368 */
369 if (list_empty(&se_nacl->acl_sess_list))
370 se_nacl->nacl_sess = NULL;
371 else {
372 se_nacl->nacl_sess = container_of(
373 se_nacl->acl_sess_list.prev,
374 struct se_session, sess_acl_list);
375 }
23388864 376 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 377 }
378}
379EXPORT_SYMBOL(transport_deregister_session_configfs);
380
381void transport_free_session(struct se_session *se_sess)
382{
383 kmem_cache_free(se_sess_cache, se_sess);
384}
385EXPORT_SYMBOL(transport_free_session);
386
387void transport_deregister_session(struct se_session *se_sess)
388{
389 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 390 struct target_core_fabric_ops *se_tfo;
c66ac9db 391 struct se_node_acl *se_nacl;
e63a8e19 392 unsigned long flags;
01468346 393 bool comp_nacl = true;
c66ac9db 394
6708bb27 395 if (!se_tpg) {
c66ac9db
NB		 396 transport_free_session(se_sess);
397 return;
398 }
01468346 399 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 400
e63a8e19 401 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 402 list_del(&se_sess->sess_list);
403 se_sess->se_tpg = NULL;
404 se_sess->fabric_sess_ptr = NULL;
e63a8e19 405 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 406
407 /*
408 * Determine if we need to do extra work for this initiator node's
409 * struct se_node_acl if it had been previously dynamically generated.
410 */
411 se_nacl = se_sess->se_node_acl;
01468346
NB		 412
413 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
414 if (se_nacl && se_nacl->dynamic_node_acl) {
415 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
416 list_del(&se_nacl->acl_list);
417 se_tpg->num_node_acls--;
418 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
419 core_tpg_wait_for_nacl_pr_ref(se_nacl);
420 core_free_device_list_for_node(se_nacl, se_tpg);
421 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
422
423 comp_nacl = false;
424 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 425 }
c66ac9db 426 }
01468346 427 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 428
6708bb27 429 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 430 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 431 /*
afb999ff
NB		 432 * If last kref is dropping now for an explict NodeACL, awake sleeping
433 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
434 * removal context.
01468346
NB		 435 */
436 if (se_nacl && comp_nacl == true)
afb999ff 437 target_put_nacl(se_nacl);
01468346 438
afb999ff 439 transport_free_session(se_sess);
c66ac9db
NB		 440}
441EXPORT_SYMBOL(transport_deregister_session);
442
443/*
a1d8b49a 444 * Called with cmd->t_state_lock held.
c66ac9db 445 */
cf572a96 446static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 447{
42bf829e 448 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 449 unsigned long flags;
450
42bf829e
CH		 451 if (!dev)
452 return;
c66ac9db 453
cf572a96
CH		 454 if (cmd->transport_state & CMD_T_BUSY)
455 return;
c66ac9db 456
cf572a96
CH		 457 spin_lock_irqsave(&dev->execute_task_lock, flags);
458 if (cmd->state_active) {
459 list_del(&cmd->state_list);
cf572a96 460 cmd->state_active = false;
c66ac9db 461 }
cf572a96 462 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 463}
464
465/* transport_cmd_check_stop():
466 *
7d680f3b 467 * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
c66ac9db
NB		 468 * 'transport_off = 2' determines if task_dev_state should be removed.
469 *
470 * A non-zero u8 t_state sets cmd->t_state.
471 * Returns 1 when command is stopped, else 0.
472 */
473static int transport_cmd_check_stop(
474 struct se_cmd *cmd,
475 int transport_off,
476 u8 t_state)
477{
478 unsigned long flags;
479
a1d8b49a 480 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 481 /*
482 * Determine if IOCTL context caller in requesting the stopping of this
483 * command for LUN shutdown purposes.
484 */
7d680f3b
CH		 485 if (cmd->transport_state & CMD_T_LUN_STOP) {
486 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
487 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 488
7d680f3b 489 cmd->transport_state &= ~CMD_T_ACTIVE;
c66ac9db 490 if (transport_off == 2)
cf572a96 491 target_remove_from_state_list(cmd);
a1d8b49a 492 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 493
a1d8b49a 494 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 495 return 1;
496 }
497 /*
498 * Determine if frontend context caller is requesting the stopping of
e3d6f909 499 * this command for frontend exceptions.
c66ac9db 500 */
7d680f3b
CH		 501 if (cmd->transport_state & CMD_T_STOP) {
502 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
503 __func__, __LINE__,
e3d6f909 504 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 505
c66ac9db 506 if (transport_off == 2)
cf572a96 507 target_remove_from_state_list(cmd);
c66ac9db
NB		 508
509 /*
510 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
511 * to FE.
512 */
513 if (transport_off == 2)
514 cmd->se_lun = NULL;
a1d8b49a 515 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 516
a1d8b49a 517 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 518 return 1;
519 }
520 if (transport_off) {
7d680f3b 521 cmd->transport_state &= ~CMD_T_ACTIVE;
c66ac9db 522 if (transport_off == 2) {
cf572a96 523 target_remove_from_state_list(cmd);
c66ac9db
NB		 524 /*
525 * Clear struct se_cmd->se_lun before the transport_off == 2
526 * handoff to fabric module.
527 */
528 cmd->se_lun = NULL;
529 /*
530 * Some fabric modules like tcm_loop can release
25985edc 531 * their internally allocated I/O reference now and
c66ac9db 532 * struct se_cmd now.
88dd9e26
NB		 533 *
534 * Fabric modules are expected to return '1' here if the
535 * se_cmd being passed is released at this point,
536 * or zero if not being released.
c66ac9db 537 */
e3d6f909 538 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 539 spin_unlock_irqrestore(
a1d8b49a 540 &cmd->t_state_lock, flags);
c66ac9db 541
88dd9e26 542 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 543 }
544 }
a1d8b49a 545 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 546
547 return 0;
548 } else if (t_state)
549 cmd->t_state = t_state;
a1d8b49a 550 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 551
552 return 0;
553}
554
555static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
556{
557 return transport_cmd_check_stop(cmd, 2, 0);
558}
559
560static void transport_lun_remove_cmd(struct se_cmd *cmd)
561{
e3d6f909 562 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 563 unsigned long flags;
564
565 if (!lun)
566 return;
567
a1d8b49a 568 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 569 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
570 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 571 target_remove_from_state_list(cmd);
c66ac9db 572 }
a1d8b49a 573 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 574
c66ac9db 575 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 576 if (!list_empty(&cmd->se_lun_node))
577 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 578 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
579}
580
581void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
582{
c8e31f26 583 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
8dc52b54 584 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 585
586 if (transport_cmd_check_stop_to_fabric(cmd))
587 return;
77039d1e 588 if (remove) {
3df8d40b 589 transport_remove_cmd_from_queue(cmd);
e6a2573f 590 transport_put_cmd(cmd);
77039d1e 591 }
c66ac9db
NB		 592}
593
f7a5cc0b
CH		 594static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
595 bool at_head)
c66ac9db
NB		 596{
597 struct se_device *dev = cmd->se_dev;
e3d6f909 598 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 599 unsigned long flags;
600
c66ac9db 601 if (t_state) {
a1d8b49a 602 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 603 cmd->t_state = t_state;
7d680f3b 604 cmd->transport_state |= CMD_T_ACTIVE;
a1d8b49a 605 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 606 }
607
608 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 609
610 /* If the cmd is already on the list, remove it before we add it */
611 if (!list_empty(&cmd->se_queue_node))
612 list_del(&cmd->se_queue_node);
613 else
614 atomic_inc(&qobj->queue_cnt);
615
f7a5cc0b 616 if (at_head)
07bde79a 617 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 618 else
07bde79a 619 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
7d680f3b 620 cmd->transport_state |= CMD_T_QUEUED;
c66ac9db
NB		 621 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
622
c66ac9db 623 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 624}
625
5951146d
AG		 626static struct se_cmd *
627transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 628{
5951146d 629 struct se_cmd *cmd;
c66ac9db
NB		 630 unsigned long flags;
631
632 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
633 if (list_empty(&qobj->qobj_list)) {
634 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
635 return NULL;
636 }
5951146d 637 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 638
7d680f3b 639 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2 640 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 641 atomic_dec(&qobj->queue_cnt);
642 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
643
5951146d 644 return cmd;
c66ac9db
NB		 645}
646
3df8d40b 647static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 648{
3df8d40b 649 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 650 unsigned long flags;
651
652 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
7d680f3b 653 if (!(cmd->transport_state & CMD_T_QUEUED)) {
c66ac9db
NB		 654 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
655 return;
656 }
7d680f3b 657 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2
RD		 658 atomic_dec(&qobj->queue_cnt);
659 list_del_init(&cmd->se_queue_node);
c66ac9db 660 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
c66ac9db
NB		 661}
662
35e0e757
CH		 663static void target_complete_failure_work(struct work_struct *work)
664{
665 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
666
03e98c9e 667 transport_generic_request_failure(cmd);
35e0e757
CH		 668}
669
5787cacd 670void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 671{
42bf829e 672 struct se_device *dev = cmd->se_dev;
5787cacd 673 int success = scsi_status == GOOD;
c66ac9db 674 unsigned long flags;
c66ac9db 675
5787cacd
CH		 676 cmd->scsi_status = scsi_status;
677
678
a1d8b49a 679 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 680 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 681
c66ac9db 682 if (dev && dev->transport->transport_complete) {
5787cacd
CH		 683 if (dev->transport->transport_complete(cmd,
684 cmd->t_data_sg) != 0) {
c66ac9db 685 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
c66ac9db
NB		 686 success = 1;
687 }
688 }
689
690 /*
5787cacd 691 * See if we are waiting to complete for an exception condition.
c66ac9db 692 */
cf572a96 693 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 694 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 695 complete(&cmd->task_stop_comp);
c66ac9db
NB		 696 return;
697 }
2235007c
CH		 698
699 if (!success)
7d680f3b 700 cmd->transport_state |= CMD_T_FAILED;
2235007c 701
3d28934a
NB		 702 /*
703 * Check for case where an explict ABORT_TASK has been received
704 * and transport_wait_for_tasks() will be waiting for completion..
705 */
706 if (cmd->transport_state & CMD_T_ABORTED &&
707 cmd->transport_state & CMD_T_STOP) {
708 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
709 complete(&cmd->t_transport_stop_comp);
710 return;
711 } else if (cmd->transport_state & CMD_T_FAILED) {
41e16e98 712 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 713 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 714 } else {
35e0e757 715 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 716 }
35e0e757 717
35e0e757 718 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 719 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 720 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 721
35e0e757 722 queue_work(target_completion_wq, &cmd->work);
c66ac9db 723}
6bb35e00
CH		 724EXPORT_SYMBOL(target_complete_cmd);
725
cf572a96 726static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 727{
cf572a96
CH		 728 struct se_device *dev = cmd->se_dev;
729 unsigned long flags;
c66ac9db 730
cf572a96
CH		 731 spin_lock_irqsave(&dev->execute_task_lock, flags);
732 if (!cmd->state_active) {
733 list_add_tail(&cmd->state_list, &dev->state_list);
734 cmd->state_active = true;
c66ac9db 735 }
cf572a96 736 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 737}
738
cf572a96 739static void __target_add_to_execute_list(struct se_cmd *cmd)
c66ac9db 740{
cf572a96
CH		 741 struct se_device *dev = cmd->se_dev;
742 bool head_of_queue = false;
c66ac9db 743
cf572a96 744 if (!list_empty(&cmd->execute_list))
c66ac9db 745 return;
c66ac9db 746
cf572a96
CH		 747 if (dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED &&
748 cmd->sam_task_attr == MSG_HEAD_TAG)
749 head_of_queue = true;
c66ac9db 750
cf572a96
CH		 751 if (head_of_queue)
752 list_add(&cmd->execute_list, &dev->execute_list);
753 else
754 list_add_tail(&cmd->execute_list, &dev->execute_list);
785fdf70 755
cf572a96 756 atomic_inc(&dev->execute_tasks);
1880807a 757
cf572a96
CH		 758 if (cmd->state_active)
759 return;
c66ac9db 760
cf572a96
CH		 761 if (head_of_queue)
762 list_add(&cmd->state_list, &dev->state_list);
763 else
764 list_add_tail(&cmd->state_list, &dev->state_list);
c66ac9db 765
cf572a96 766 cmd->state_active = true;
4d2300cc
NB		 767}
768
cf572a96 769static void target_add_to_execute_list(struct se_cmd *cmd)
4d2300cc
NB		 770{
771 unsigned long flags;
772 struct se_device *dev = cmd->se_dev;
773
774 spin_lock_irqsave(&dev->execute_task_lock, flags);
cf572a96 775 __target_add_to_execute_list(cmd);
c66ac9db 776 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 777}
778
cf572a96 779void __target_remove_from_execute_list(struct se_cmd *cmd)
04629b7b 780{
cf572a96
CH		 781 list_del_init(&cmd->execute_list);
782 atomic_dec(&cmd->se_dev->execute_tasks);
04629b7b
CH		 783}
784
cf572a96 785static void target_remove_from_execute_list(struct se_cmd *cmd)
c66ac9db 786{
cf572a96 787 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 788 unsigned long flags;
789
cf572a96 790 if (WARN_ON(list_empty(&cmd->execute_list)))
af57c3ac 791 return;
af57c3ac 792
c66ac9db 793 spin_lock_irqsave(&dev->execute_task_lock, flags);
cf572a96 794 __target_remove_from_execute_list(cmd);
c66ac9db
NB		 795 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
796}
797
07bde79a 798/*
f147abb4 799 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 800 */
801
802static void target_qf_do_work(struct work_struct *work)
803{
804 struct se_device *dev = container_of(work, struct se_device,
805 qf_work_queue);
bcac364a 806 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 807 struct se_cmd *cmd, *cmd_tmp;
808
809 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 810 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
811 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 812
bcac364a 813 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 814 list_del(&cmd->se_qf_node);
815 atomic_dec(&dev->dev_qf_count);
816 smp_mb__after_atomic_dec();
07bde79a 817
6708bb27 818 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 819 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 820 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 821 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
822 : "UNKNOWN");
f7a5cc0b
CH		 823
824 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 825 }
07bde79a
NB		 826}
827
c66ac9db
NB		 828unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
829{
830 switch (cmd->data_direction) {
831 case DMA_NONE:
832 return "NONE";
833 case DMA_FROM_DEVICE:
834 return "READ";
835 case DMA_TO_DEVICE:
836 return "WRITE";
837 case DMA_BIDIRECTIONAL:
838 return "BIDI";
839 default:
840 break;
841 }
842
843 return "UNKNOWN";
844}
845
846void transport_dump_dev_state(
847 struct se_device *dev,
848 char *b,
849 int *bl)
850{
851 *bl += sprintf(b + *bl, "Status: ");
852 switch (dev->dev_status) {
853 case TRANSPORT_DEVICE_ACTIVATED:
854 *bl += sprintf(b + *bl, "ACTIVATED");
855 break;
856 case TRANSPORT_DEVICE_DEACTIVATED:
857 *bl += sprintf(b + *bl, "DEACTIVATED");
858 break;
859 case TRANSPORT_DEVICE_SHUTDOWN:
860 *bl += sprintf(b + *bl, "SHUTDOWN");
861 break;
862 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
863 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
864 *bl += sprintf(b + *bl, "OFFLINE");
865 break;
866 default:
867 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
868 break;
869 }
870
65586d51
NB		 871 *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d",
872 atomic_read(&dev->execute_tasks), dev->queue_depth);
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:
2484 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2485 if (sector_ret)
2486 goto out_unsupported_cdb;
2487 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2488 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2489 if (cdb[1] & 0x8)
2490 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2491 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2492 break;
2493 case WRITE_12:
2494 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2495 if (sector_ret)
2496 goto out_unsupported_cdb;
2497 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2498 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2499 if (cdb[1] & 0x8)
2500 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2501 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2502 break;
2503 case WRITE_16:
2504 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2505 if (sector_ret)
2506 goto out_unsupported_cdb;
2507 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2508 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2509 if (cdb[1] & 0x8)
2510 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2511 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2512 break;
2513 case XDWRITEREAD_10:
2514 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2515 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2516 goto out_invalid_cdb_field;
2517 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2518 if (sector_ret)
2519 goto out_unsupported_cdb;
2520 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2521 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2522 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2523
5bda90c8
CH		 2524 /*
2525 * Do now allow BIDI commands for passthrough mode.
2526 */
2527 if (passthrough)
7c1c6af3 2528 goto out_unsupported_cdb;
5bda90c8 2529
c66ac9db 2530 /*
35e0e757 2531 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2532 */
2533 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2534 if (cdb[1] & 0x8)
2535 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2536 break;
2537 case VARIABLE_LENGTH_CMD:
2538 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2539 switch (service_action) {
2540 case XDWRITEREAD_32:
2541 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2542 if (sector_ret)
2543 goto out_unsupported_cdb;
2544 size = transport_get_size(sectors, cdb, cmd);
2545 /*
2546 * Use WRITE_32 and READ_32 opcodes for the emulated
2547 * XDWRITE_READ_32 logic.
2548 */
a1d8b49a 2549 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2550 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2551
5bda90c8
CH		 2552 /*
2553 * Do now allow BIDI commands for passthrough mode.
2554 */
c66ac9db 2555 if (passthrough)
7c1c6af3 2556 goto out_unsupported_cdb;
5bda90c8 2557
c66ac9db 2558 /*
35e0e757
CH		 2559 * Setup BIDI XOR callback to be run during after I/O
2560 * completion.
c66ac9db
NB		 2561 */
2562 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2563 if (cdb[1] & 0x8)
2564 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2565 break;
2566 case WRITE_SAME_32:
2567 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2568 if (sector_ret)
2569 goto out_unsupported_cdb;
dd3a5ad8 2570
6708bb27 2571 if (sectors)
12850626 2572 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2573 else {
2574 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2575 " supported\n");
2576 goto out_invalid_cdb_field;
2577 }
dd3a5ad8 2578
a1d8b49a 2579 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2580 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2581
706d5860 2582 if (target_check_write_same_discard(&cdb[10], dev) < 0)
67236c44 2583 goto out_unsupported_cdb;
5bda90c8 2584 if (!passthrough)
6bb35e00 2585 cmd->execute_cmd = target_emulate_write_same;
c66ac9db
NB		 2586 break;
2587 default:
6708bb27 2588 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2589 " 0x%04x not supported\n", service_action);
2590 goto out_unsupported_cdb;
2591 }
2592 break;
e434f1f1 2593 case MAINTENANCE_IN:
e3d6f909 2594 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2595 /* MAINTENANCE_IN from SCC-2 */
2596 /*
2597 * Check for emulated MI_REPORT_TARGET_PGS.
2598 */
e76a35d6
CH		 2599 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2600 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
6bb35e00 2601 cmd->execute_cmd =
e76a35d6 2602 target_emulate_report_target_port_groups;
c66ac9db
NB		 2603 }
2604 size = (cdb[6] << 24) | (cdb[7] << 16) |
2605 (cdb[8] << 8) | cdb[9];
2606 } else {
2607 /* GPCMD_SEND_KEY from multi media commands */
2608 size = (cdb[8] << 8) + cdb[9];
2609 }
05d1c7c0 2610 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2611 break;
2612 case MODE_SELECT:
2613 size = cdb[4];
2614 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2615 break;
2616 case MODE_SELECT_10:
2617 size = (cdb[7] << 8) + cdb[8];
2618 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2619 break;
2620 case MODE_SENSE:
2621 size = cdb[4];
05d1c7c0 2622 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2623 if (!passthrough)
6bb35e00 2624 cmd->execute_cmd = target_emulate_modesense;
c66ac9db
NB		 2625 break;
2626 case MODE_SENSE_10:
5bda90c8
CH		 2627 size = (cdb[7] << 8) + cdb[8];
2628 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2629 if (!passthrough)
6bb35e00 2630 cmd->execute_cmd = target_emulate_modesense;
5bda90c8 2631 break;
c66ac9db
NB		 2632 case GPCMD_READ_BUFFER_CAPACITY:
2633 case GPCMD_SEND_OPC:
2634 case LOG_SELECT:
2635 case LOG_SENSE:
2636 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2637 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2638 break;
2639 case READ_BLOCK_LIMITS:
2640 size = READ_BLOCK_LEN;
05d1c7c0 2641 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2642 break;
2643 case GPCMD_GET_CONFIGURATION:
2644 case GPCMD_READ_FORMAT_CAPACITIES:
2645 case GPCMD_READ_DISC_INFO:
2646 case GPCMD_READ_TRACK_RZONE_INFO:
2647 size = (cdb[7] << 8) + cdb[8];
2648 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2649 break;
2650 case PERSISTENT_RESERVE_IN:
617c0e06 2651 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
6bb35e00 2652 cmd->execute_cmd = target_scsi3_emulate_pr_in;
617c0e06
CH		 2653 size = (cdb[7] << 8) + cdb[8];
2654 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2655 break;
c66ac9db 2656 case PERSISTENT_RESERVE_OUT:
617c0e06 2657 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
6bb35e00 2658 cmd->execute_cmd = target_scsi3_emulate_pr_out;
c66ac9db 2659 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2660 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2661 break;
2662 case GPCMD_MECHANISM_STATUS:
2663 case GPCMD_READ_DVD_STRUCTURE:
2664 size = (cdb[8] << 8) + cdb[9];
2665 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2666 break;
2667 case READ_POSITION:
2668 size = READ_POSITION_LEN;
05d1c7c0 2669 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2670 break;
e434f1f1 2671 case MAINTENANCE_OUT:
e3d6f909 2672 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2673 /* MAINTENANCE_OUT from SCC-2
2674 *
2675 * Check for emulated MO_SET_TARGET_PGS.
2676 */
e76a35d6
CH		 2677 if (cdb[1] == MO_SET_TARGET_PGS &&
2678 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
6bb35e00 2679 cmd->execute_cmd =
e76a35d6 2680 target_emulate_set_target_port_groups;
c66ac9db
NB		 2681 }
2682
2683 size = (cdb[6] << 24) | (cdb[7] << 16) |
2684 (cdb[8] << 8) | cdb[9];
2685 } else {
2686 /* GPCMD_REPORT_KEY from multi media commands */
2687 size = (cdb[8] << 8) + cdb[9];
2688 }
05d1c7c0 2689 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2690 break;
2691 case INQUIRY:
2692 size = (cdb[3] << 8) + cdb[4];
2693 /*
2694 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2695 * See spc4r17 section 5.3
2696 */
5951146d 2697 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2698 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2699 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2700 if (!passthrough)
6bb35e00 2701 cmd->execute_cmd = target_emulate_inquiry;
c66ac9db
NB		 2702 break;
2703 case READ_BUFFER:
2704 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2705 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2706 break;
2707 case READ_CAPACITY:
2708 size = READ_CAP_LEN;
05d1c7c0 2709 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2710 if (!passthrough)
6bb35e00 2711 cmd->execute_cmd = target_emulate_readcapacity;
c66ac9db
NB		 2712 break;
2713 case READ_MEDIA_SERIAL_NUMBER:
2714 case SECURITY_PROTOCOL_IN:
2715 case SECURITY_PROTOCOL_OUT:
2716 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2717 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2718 break;
2719 case SERVICE_ACTION_IN:
5bda90c8
CH		 2720 switch (cmd->t_task_cdb[1] & 0x1f) {
2721 case SAI_READ_CAPACITY_16:
2722 if (!passthrough)
6bb35e00 2723 cmd->execute_cmd =
5bda90c8
CH		 2724 target_emulate_readcapacity_16;
2725 break;
2726 default:
2727 if (passthrough)
2728 break;
2729
2730 pr_err("Unsupported SA: 0x%02x\n",
2731 cmd->t_task_cdb[1] & 0x1f);
b168fe8c 2732 goto out_invalid_cdb_field;
5bda90c8
CH		 2733 }
2734 /*FALLTHROUGH*/
c66ac9db
NB		 2735 case ACCESS_CONTROL_IN:
2736 case ACCESS_CONTROL_OUT:
2737 case EXTENDED_COPY:
2738 case READ_ATTRIBUTE:
2739 case RECEIVE_COPY_RESULTS:
2740 case WRITE_ATTRIBUTE:
2741 size = (cdb[10] << 24) | (cdb[11] << 16) |
2742 (cdb[12] << 8) | cdb[13];
05d1c7c0 2743 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2744 break;
2745 case RECEIVE_DIAGNOSTIC:
2746 case SEND_DIAGNOSTIC:
2747 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2748 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2749 break;
2750/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2751#if 0
2752 case GPCMD_READ_CD:
2753 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2754 size = (2336 * sectors);
05d1c7c0 2755 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2756 break;
2757#endif
2758 case READ_TOC:
2759 size = cdb[8];
05d1c7c0 2760 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2761 break;
2762 case REQUEST_SENSE:
2763 size = cdb[4];
05d1c7c0 2764 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2765 if (!passthrough)
6bb35e00 2766 cmd->execute_cmd = target_emulate_request_sense;
c66ac9db
NB		 2767 break;
2768 case READ_ELEMENT_STATUS:
2769 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2770 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2771 break;
2772 case WRITE_BUFFER:
2773 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2774 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2775 break;
2776 case RESERVE:
2777 case RESERVE_10:
2778 /*
2779 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2780 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2781 */
2782 if (cdb[0] == RESERVE_10)
2783 size = (cdb[7] << 8) | cdb[8];
2784 else
2785 size = cmd->data_length;
2786
2787 /*
2788 * Setup the legacy emulated handler for SPC-2 and
2789 * >= SPC-3 compatible reservation handling (CRH=1)
2790 * Otherwise, we assume the underlying SCSI logic is
2791 * is running in SPC_PASSTHROUGH, and wants reservations
2792 * emulation disabled.
2793 */
e76a35d6 2794 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
6bb35e00 2795 cmd->execute_cmd = target_scsi2_reservation_reserve;
c66ac9db
NB		 2796 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2797 break;
2798 case RELEASE:
2799 case RELEASE_10:
2800 /*
2801 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2802 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2803 */
2804 if (cdb[0] == RELEASE_10)
2805 size = (cdb[7] << 8) | cdb[8];
2806 else
2807 size = cmd->data_length;
2808
e76a35d6 2809 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
6bb35e00 2810 cmd->execute_cmd = target_scsi2_reservation_release;
c66ac9db
NB		 2811 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2812 break;
2813 case SYNCHRONIZE_CACHE:
8e94b8db 2814 case SYNCHRONIZE_CACHE_16:
c66ac9db
NB		 2815 /*
2816 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2817 */
2818 if (cdb[0] == SYNCHRONIZE_CACHE) {
2819 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2820 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2821 } else {
2822 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2823 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2824 }
2825 if (sector_ret)
2826 goto out_unsupported_cdb;
2827
2828 size = transport_get_size(sectors, cdb, cmd);
2829 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2830
5bda90c8 2831 if (passthrough)
c66ac9db 2832 break;
5bda90c8 2833
c66ac9db
NB		 2834 /*
2835 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 2836 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 2837 */
7abbe7f3
NB		 2838 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2839 if (transport_cmd_get_valid_sectors(cmd) < 0)
2840 goto out_invalid_cdb_field;
2841 }
6bb35e00 2842 cmd->execute_cmd = target_emulate_synchronize_cache;
c66ac9db
NB		 2843 break;
2844 case UNMAP:
2845 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 2846 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8 2847 if (!passthrough)
6bb35e00 2848 cmd->execute_cmd = target_emulate_unmap;
c66ac9db
NB		 2849 break;
2850 case WRITE_SAME_16:
2851 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2852 if (sector_ret)
2853 goto out_unsupported_cdb;
dd3a5ad8 2854
6708bb27 2855 if (sectors)
12850626 2856 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2857 else {
2858 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2859 goto out_invalid_cdb_field;
2860 }
dd3a5ad8 2861
5db0753b 2862 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 2863 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2864
2865 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 2866 goto out_unsupported_cdb;
5bda90c8 2867 if (!passthrough)
6bb35e00 2868 cmd->execute_cmd = target_emulate_write_same;
706d5860
NB		 2869 break;
2870 case WRITE_SAME:
2871 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2872 if (sector_ret)
2873 goto out_unsupported_cdb;
2874
2875 if (sectors)
12850626 2876 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 2877 else {
2878 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2879 goto out_invalid_cdb_field;
c66ac9db 2880 }
706d5860
NB		 2881
2882 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 2883 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 2884 /*
2885 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2886 * of byte 1 bit 3 UNMAP instead of original reserved field
2887 */
2888 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 2889 goto out_unsupported_cdb;
5bda90c8 2890 if (!passthrough)
6bb35e00 2891 cmd->execute_cmd = target_emulate_write_same;
c66ac9db
NB		 2892 break;
2893 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 2894 case ERASE:
c66ac9db
NB		 2895 case REZERO_UNIT:
2896 case SEEK_10:
c66ac9db
NB		 2897 case SPACE:
2898 case START_STOP:
2899 case TEST_UNIT_READY:
2900 case VERIFY:
2901 case WRITE_FILEMARKS:
5bda90c8
CH		 2902 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2903 if (!passthrough)
6bb35e00 2904 cmd->execute_cmd = target_emulate_noop;
5bda90c8
CH		 2905 break;
2906 case GPCMD_CLOSE_TRACK:
2907 case INITIALIZE_ELEMENT_STATUS:
2908 case GPCMD_LOAD_UNLOAD:
2909 case GPCMD_SET_SPEED:
c66ac9db
NB		 2910 case MOVE_MEDIUM:
2911 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2912 break;
2913 case REPORT_LUNS:
6bb35e00 2914 cmd->execute_cmd = target_report_luns;
c66ac9db
NB		 2915 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2916 /*
2917 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2918 * See spc4r17 section 5.3
2919 */
5951146d 2920 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2921 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2922 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2923 break;
ed0b2144
SH		 2924 case GET_EVENT_STATUS_NOTIFICATION:
2925 size = (cdb[7] << 8) | cdb[8];
2926 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2927 break;
c66ac9db 2928 default:
6708bb27 2929 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 2930 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 2931 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 2932 goto out_unsupported_cdb;
2933 }
2934
b0d79946
SAS		 2935 if (cmd->unknown_data_length)
2936 cmd->data_length = size;
2937
c66ac9db 2938 if (size != cmd->data_length) {
6708bb27 2939 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 2940 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 2941 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 2942 cmd->data_length, size, cdb[0]);
2943
2944 cmd->cmd_spdtl = size;
2945
2946 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 2947 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 2948 " WRITE data\n");
2949 goto out_invalid_cdb_field;
2950 }
2951 /*
2952 * Reject READ_* or WRITE_* with overflow/underflow for
2953 * type SCF_SCSI_DATA_SG_IO_CDB.
2954 */
6708bb27
AG		 2955 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
2956 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 2957 " CDB on non 512-byte sector setup subsystem"
e3d6f909 2958 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 2959 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
2960 goto out_invalid_cdb_field;
2961 }
2962
2963 if (size > cmd->data_length) {
2964 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
2965 cmd->residual_count = (size - cmd->data_length);
2966 } else {
2967 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
2968 cmd->residual_count = (cmd->data_length - size);
2969 }
2970 cmd->data_length = size;
2971 }
2972
7b4deef5
NB		 2973 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
2974 if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
2975 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
2976 " big sectors %u exceeds fabric_max_sectors:"
2977 " %u\n", cdb[0], sectors,
2978 su_dev->se_dev_attrib.fabric_max_sectors);
2979 goto out_invalid_cdb_field;
2980 }
2981 if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
2982 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
2983 " big sectors %u exceeds backend hw_max_sectors:"
2984 " %u\n", cdb[0], sectors,
2985 su_dev->se_dev_attrib.hw_max_sectors);
2986 goto out_invalid_cdb_field;
2987 }
015487b8
RD		 2988 }
2989
5bda90c8 2990 /* reject any command that we don't have a handler for */
6bb35e00 2991 if (!(passthrough || cmd->execute_cmd ||
5bda90c8
CH		 2992 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2993 goto out_unsupported_cdb;
2994
c66ac9db
NB		 2995 transport_set_supported_SAM_opcode(cmd);
2996 return ret;
2997
2998out_unsupported_cdb:
2999 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3000 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3001 return -EINVAL;
c66ac9db
NB		 3002out_invalid_cdb_field:
3003 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3004 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3005 return -EINVAL;
c66ac9db
NB		 3006}
3007
c66ac9db 3008/*
35e0e757 3009 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3010 * and ordered cmds need to have their tasks added to the execution queue.
3011 */
3012static void transport_complete_task_attr(struct se_cmd *cmd)
3013{
5951146d 3014 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3015 struct se_cmd *cmd_p, *cmd_tmp;
3016 int new_active_tasks = 0;
3017
e66ecd50 3018 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3019 atomic_dec(&dev->simple_cmds);
3020 smp_mb__after_atomic_dec();
3021 dev->dev_cur_ordered_id++;
6708bb27 3022 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3023 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3024 cmd->se_ordered_id);
e66ecd50 3025 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3026 dev->dev_cur_ordered_id++;
6708bb27 3027 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3028 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3029 cmd->se_ordered_id);
e66ecd50 3030 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3031 atomic_dec(&dev->dev_ordered_sync);
3032 smp_mb__after_atomic_dec();
c66ac9db
NB		 3033
3034 dev->dev_cur_ordered_id++;
6708bb27 3035 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3036 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3037 }
3038 /*
3039 * Process all commands up to the last received
3040 * ORDERED task attribute which requires another blocking
3041 * boundary
3042 */
3043 spin_lock(&dev->delayed_cmd_lock);
3044 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3045 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3046
5951146d 3047 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3048 spin_unlock(&dev->delayed_cmd_lock);
3049
6708bb27 3050 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3051 " cmd_p: 0x%02x Task Attr: 0x%02x"
3052 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3053 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3054 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3055
cf572a96 3056 target_add_to_execute_list(cmd_p);
c66ac9db
NB		 3057 new_active_tasks++;
3058
3059 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3060 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3061 break;
3062 }
3063 spin_unlock(&dev->delayed_cmd_lock);
3064 /*
3065 * If new tasks have become active, wake up the transport thread
3066 * to do the processing of the Active tasks.
3067 */
3068 if (new_active_tasks != 0)
e3d6f909 3069 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3070}
3071
e057f533 3072static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3073{
3074 int ret = 0;
3075
e057f533
CH		 3076 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3077 transport_complete_task_attr(cmd);
3078
3079 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3080 ret = cmd->se_tfo->queue_status(cmd);
3081 if (ret)
3082 goto out;
3083 }
07bde79a
NB		 3084
3085 switch (cmd->data_direction) {
3086 case DMA_FROM_DEVICE:
3087 ret = cmd->se_tfo->queue_data_in(cmd);
3088 break;
3089 case DMA_TO_DEVICE:
ec98f782 3090 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3091 ret = cmd->se_tfo->queue_data_in(cmd);
3092 if (ret < 0)
e057f533 3093 break;
07bde79a
NB		 3094 }
3095 /* Fall through for DMA_TO_DEVICE */
3096 case DMA_NONE:
3097 ret = cmd->se_tfo->queue_status(cmd);
3098 break;
3099 default:
3100 break;
3101 }
3102
e057f533
CH		 3103out:
3104 if (ret < 0) {
3105 transport_handle_queue_full(cmd, cmd->se_dev);
3106 return;
3107 }
3108 transport_lun_remove_cmd(cmd);
3109 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3110}
3111
3112static void transport_handle_queue_full(
3113 struct se_cmd *cmd,
e057f533 3114 struct se_device *dev)
07bde79a
NB		 3115{
3116 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3117 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3118 atomic_inc(&dev->dev_qf_count);
3119 smp_mb__after_atomic_inc();
3120 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3121
3122 schedule_work(&cmd->se_dev->qf_work_queue);
3123}
3124
35e0e757 3125static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3126{
35e0e757 3127 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3128 int reason = 0, ret;
35e0e757 3129
c66ac9db
NB		 3130 /*
3131 * Check if we need to move delayed/dormant tasks from cmds on the
3132 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3133 * Attribute.
3134 */
5951146d 3135 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3136 transport_complete_task_attr(cmd);
07bde79a
NB		 3137 /*
3138 * Check to schedule QUEUE_FULL work, or execute an existing
3139 * cmd->transport_qf_callback()
3140 */
3141 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3142 schedule_work(&cmd->se_dev->qf_work_queue);
3143
c66ac9db
NB		 3144 /*
3145 * Check if we need to retrieve a sense buffer from
3146 * the struct se_cmd in question.
3147 */
3148 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3149 if (transport_get_sense_data(cmd) < 0)
3150 reason = TCM_NON_EXISTENT_LUN;
3151
c66ac9db 3152 if (cmd->scsi_status) {
07bde79a 3153 ret = transport_send_check_condition_and_sense(
c66ac9db 3154 cmd, reason, 1);
f147abb4 3155 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3156 goto queue_full;
3157
c66ac9db
NB		 3158 transport_lun_remove_cmd(cmd);
3159 transport_cmd_check_stop_to_fabric(cmd);
3160 return;
3161 }
3162 }
3163 /*
25985edc 3164 * Check for a callback, used by amongst other things
c66ac9db
NB		 3165 * XDWRITE_READ_10 emulation.
3166 */
3167 if (cmd->transport_complete_callback)
3168 cmd->transport_complete_callback(cmd);
3169
3170 switch (cmd->data_direction) {
3171 case DMA_FROM_DEVICE:
3172 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3173 if (cmd->se_lun->lun_sep) {
3174 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3175 cmd->data_length;
3176 }
3177 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3178
07bde79a 3179 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3180 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3181 goto queue_full;
c66ac9db
NB		 3182 break;
3183 case DMA_TO_DEVICE:
3184 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3185 if (cmd->se_lun->lun_sep) {
3186 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3187 cmd->data_length;
3188 }
3189 spin_unlock(&cmd->se_lun->lun_sep_lock);
3190 /*
3191 * Check if we need to send READ payload for BIDI-COMMAND
3192 */
ec98f782 3193 if (cmd->t_bidi_data_sg) {
c66ac9db 3194 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3195 if (cmd->se_lun->lun_sep) {
3196 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3197 cmd->data_length;
3198 }
3199 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3200 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3201 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3202 goto queue_full;
c66ac9db
NB		 3203 break;
3204 }
3205 /* Fall through for DMA_TO_DEVICE */
3206 case DMA_NONE:
07bde79a 3207 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3208 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3209 goto queue_full;
c66ac9db
NB		 3210 break;
3211 default:
3212 break;
3213 }
3214
3215 transport_lun_remove_cmd(cmd);
3216 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3217 return;
3218
3219queue_full:
6708bb27 3220 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3221 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3222 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3223 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3224}
3225
6708bb27 3226static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3227{
ec98f782 3228 struct scatterlist *sg;
ec98f782 3229 int count;
c66ac9db 3230
6708bb27
AG		 3231 for_each_sg(sgl, sg, nents, count)
3232 __free_page(sg_page(sg));
c66ac9db 3233
6708bb27
AG		 3234 kfree(sgl);
3235}
c66ac9db 3236
6708bb27
AG		 3237static inline void transport_free_pages(struct se_cmd *cmd)
3238{
3239 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3240 return;
3241
3242 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3243 cmd->t_data_sg = NULL;
3244 cmd->t_data_nents = 0;
c66ac9db 3245
6708bb27 3246 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3247 cmd->t_bidi_data_sg = NULL;
3248 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3249}
3250
e26d99ae
CH		 3251/**
3252 * transport_release_cmd - free a command
3253 * @cmd: command to free
3254 *
3255 * This routine unconditionally frees a command, and reference counting
3256 * or list removal must be done in the caller.
3257 */
3258static void transport_release_cmd(struct se_cmd *cmd)
3259{
3260 BUG_ON(!cmd->se_tfo);
3261
c8e31f26 3262 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 3263 core_tmr_release_req(cmd->se_tmr_req);
3264 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3265 kfree(cmd->t_task_cdb);
3266 /*
7481deb4
NB		 3267 * If this cmd has been setup with target_get_sess_cmd(), drop
3268 * the kref and call ->release_cmd() in kref callback.
e26d99ae 3269 */
7481deb4
NB		 3270 if (cmd->check_release != 0) {
3271 target_put_sess_cmd(cmd->se_sess, cmd);
3272 return;
3273 }
e26d99ae
CH		 3274 cmd->se_tfo->release_cmd(cmd);
3275}
3276
d3df7825
CH		 3277/**
3278 * transport_put_cmd - release a reference to a command
3279 * @cmd: command to release
3280 *
3281 * This routine releases our reference to the command and frees it if possible.
3282 */
39c05f32 3283static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3284{
3285 unsigned long flags;
c66ac9db 3286
a1d8b49a 3287 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3288 if (atomic_read(&cmd->t_fe_count)) {
3289 if (!atomic_dec_and_test(&cmd->t_fe_count))
3290 goto out_busy;
3291 }
3292
7d680f3b
CH		 3293 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3294 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 3295 target_remove_from_state_list(cmd);
c66ac9db 3296 }
a1d8b49a 3297 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3298
c66ac9db 3299 transport_free_pages(cmd);
31afc39c 3300 transport_release_cmd(cmd);
39c05f32 3301 return;
4911e3cc
CH		 3302out_busy:
3303 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3304}
3305
c66ac9db 3306/*
ec98f782
AG		 3307 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3308 * allocating in the core.
c66ac9db
NB		 3309 * @cmd: Associated se_cmd descriptor
3310 * @mem: SGL style memory for TCM WRITE / READ
3311 * @sg_mem_num: Number of SGL elements
3312 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3313 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3314 *
3315 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3316 * of parameters.
3317 */
3318int transport_generic_map_mem_to_cmd(
3319 struct se_cmd *cmd,
5951146d
AG		 3320 struct scatterlist *sgl,
3321 u32 sgl_count,
3322 struct scatterlist *sgl_bidi,
3323 u32 sgl_bidi_count)
c66ac9db 3324{
5951146d 3325 if (!sgl || !sgl_count)
c66ac9db 3326 return 0;
c66ac9db 3327
c66ac9db
NB		 3328 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3329 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
fef58a60
NB		 3330 /*
3331 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3332 * scatterlists already have been set to follow what the fabric
3333 * passes for the original expected data transfer length.
3334 */
3335 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3336 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3337 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3338 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3339 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3340 return -EINVAL;
3341 }
c66ac9db 3342
ec98f782
AG		 3343 cmd->t_data_sg = sgl;
3344 cmd->t_data_nents = sgl_count;
c66ac9db 3345
ec98f782
AG		 3346 if (sgl_bidi && sgl_bidi_count) {
3347 cmd->t_bidi_data_sg = sgl_bidi;
3348 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3349 }
3350 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3351 }
3352
3353 return 0;
3354}
3355EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3356
4949314c 3357void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3358{
ec98f782 3359 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 3360 struct page **pages;
3361 int i;
05d1c7c0 3362
ec98f782 3363 BUG_ON(!sg);
05d1c7c0 3364 /*
ec98f782
AG		 3365 * We need to take into account a possible offset here for fabrics like
3366 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3367 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3368 */
4949314c
AG		 3369 if (!cmd->t_data_nents)
3370 return NULL;
3371 else if (cmd->t_data_nents == 1)
3372 return kmap(sg_page(sg)) + sg->offset;
3373
3374 /* >1 page. use vmap */
3375 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3376 if (!pages)
3377 return NULL;
3378
3379 /* convert sg[] to pages[] */
3380 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3381 pages[i] = sg_page(sg);
3382 }
3383
3384 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
3385 kfree(pages);
3386 if (!cmd->t_data_vmap)
3387 return NULL;
3388
3389 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 3390}
4949314c 3391EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 3392
4949314c 3393void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3394{
a1edf9cf 3395 if (!cmd->t_data_nents) {
4949314c 3396 return;
a1edf9cf 3397 } else if (cmd->t_data_nents == 1) {
4949314c 3398 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 3399 return;
3400 }
4949314c
AG		 3401
3402 vunmap(cmd->t_data_vmap);
3403 cmd->t_data_vmap = NULL;
05d1c7c0 3404}
4949314c 3405EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 3406
c66ac9db 3407static int
05d1c7c0 3408transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3409{
ec98f782
AG		 3410 u32 length = cmd->data_length;
3411 unsigned int nents;
3412 struct page *page;
9db9da33 3413 gfp_t zero_flag;
ec98f782 3414 int i = 0;
c66ac9db 3415
ec98f782
AG		 3416 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3417 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3418 if (!cmd->t_data_sg)
3419 return -ENOMEM;
c66ac9db 3420
ec98f782
AG		 3421 cmd->t_data_nents = nents;
3422 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3423
9db9da33 3424 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3425
ec98f782
AG		 3426 while (length) {
3427 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 3428 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 3429 if (!page)
3430 goto out;
c66ac9db 3431
ec98f782
AG		 3432 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3433 length -= page_len;
3434 i++;
c66ac9db 3435 }
c66ac9db 3436 return 0;
c66ac9db 3437
ec98f782
AG		 3438out:
3439 while (i >= 0) {
3440 __free_page(sg_page(&cmd->t_data_sg[i]));
3441 i--;
c66ac9db 3442 }
ec98f782
AG		 3443 kfree(cmd->t_data_sg);
3444 cmd->t_data_sg = NULL;
3445 return -ENOMEM;
c66ac9db
NB		 3446}
3447
da0f7619 3448/*
b16a35b0
AG		 3449 * Allocate any required resources to execute the command. For writes we
3450 * might not have the payload yet, so notify the fabric via a call to
3451 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 3452 */
a1d8b49a 3453int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3454{
da0f7619 3455 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3456 int ret = 0;
3457
3458 /*
3459 * Determine is the TCM fabric module has already allocated physical
3460 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3461 * beforehand.
c66ac9db 3462 */
ec98f782
AG		 3463 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3464 cmd->data_length) {
05d1c7c0 3465 ret = transport_generic_get_mem(cmd);
c66ac9db 3466 if (ret < 0)
03e98c9e 3467 goto out_fail;
c66ac9db 3468 }
da0f7619 3469
4101f0a8
CH		 3470 /* Workaround for handling zero-length control CDBs */
3471 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3472 !cmd->data_length) {
7d680f3b 3473 spin_lock_irq(&cmd->t_state_lock);
410f6702 3474 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 3475 cmd->transport_state |= CMD_T_ACTIVE;
3476 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 3477
3478 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3479 u8 ua_asc = 0, ua_ascq = 0;
3480
3481 core_scsi3_ua_clear_for_request_sense(cmd,
3482 &ua_asc, &ua_ascq);
3483 }
3484
410f6702
RD		 3485 INIT_WORK(&cmd->work, target_complete_ok_work);
3486 queue_work(target_completion_wq, &cmd->work);
3487 return 0;
3488 }
da0f7619 3489
4101f0a8
CH		 3490 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3491 struct se_dev_attrib *attr = &dev->se_sub_dev->se_dev_attrib;
3492
3493 if (transport_cmd_get_valid_sectors(cmd) < 0)
3494 return -EINVAL;
3495
3496 BUG_ON(cmd->data_length % attr->block_size);
3497 BUG_ON(DIV_ROUND_UP(cmd->data_length, attr->block_size) >
11e764bd 3498 attr->hw_max_sectors);
da0f7619
CH		 3499 }
3500
4101f0a8 3501 atomic_inc(&cmd->t_fe_count);
4101f0a8 3502
c66ac9db 3503 /*
5787cacd
CH		 3504 * For WRITEs, let the fabric know its buffer is ready.
3505 *
3506 * The command will be added to the execution queue after its write
3507 * data has arrived.
c66ac9db
NB		 3508 */
3509 if (cmd->data_direction == DMA_TO_DEVICE) {
cf572a96 3510 target_add_to_state_list(cmd);
c66ac9db
NB		 3511 return transport_generic_write_pending(cmd);
3512 }
3513 /*
5787cacd 3514 * Everything else but a WRITE, add the command to the execution queue.
c66ac9db
NB		 3515 */
3516 transport_execute_tasks(cmd);
3517 return 0;
da0f7619
CH		 3518
3519out_fail:
3520 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3521 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3522 return -EINVAL;
c66ac9db 3523}
a1d8b49a 3524EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3525
3526/* transport_generic_process_write():
3527 *
3528 *
3529 */
3530void transport_generic_process_write(struct se_cmd *cmd)
3531{
c66ac9db
NB		 3532 transport_execute_tasks(cmd);
3533}
3534EXPORT_SYMBOL(transport_generic_process_write);
3535
e057f533 3536static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3537{
f147abb4
NB		 3538 int ret;
3539
3540 ret = cmd->se_tfo->write_pending(cmd);
3541 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3542 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3543 cmd);
3544 transport_handle_queue_full(cmd, cmd->se_dev);
3545 }
07bde79a
NB		 3546}
3547
c66ac9db
NB		 3548static int transport_generic_write_pending(struct se_cmd *cmd)
3549{
3550 unsigned long flags;
3551 int ret;
3552
a1d8b49a 3553 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3554 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3555 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3556
c66ac9db
NB		 3557 /*
3558 * Clear the se_cmd for WRITE_PENDING status in order to set
7d680f3b
CH		 3559 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3560 * from HW target mode interrupt code. This is safe to be called
3561 * with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3562 * because the se_cmd->se_lun pointer is not being cleared.
3563 */
3564 transport_cmd_check_stop(cmd, 1, 0);
3565
3566 /*
3567 * Call the fabric write_pending function here to let the
3568 * frontend know that WRITE buffers are ready.
3569 */
e3d6f909 3570 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3571 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3572 goto queue_full;
3573 else if (ret < 0)
c66ac9db
NB		 3574 return ret;
3575
03e98c9e 3576 return 1;
07bde79a
NB		 3577
3578queue_full:
6708bb27 3579 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3580 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3581 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3582 return 0;
c66ac9db
NB		 3583}
3584
39c05f32 3585void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3586{
d14921d6 3587 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 3588 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 3589 transport_wait_for_tasks(cmd);
3590
35462975 3591 transport_release_cmd(cmd);
d14921d6
NB		 3592 } else {
3593 if (wait_for_tasks)
3594 transport_wait_for_tasks(cmd);
3595
c66ac9db
NB		 3596 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3597
82f1c8a4 3598 if (cmd->se_lun)
c66ac9db 3599 transport_lun_remove_cmd(cmd);
c66ac9db 3600
39c05f32 3601 transport_put_cmd(cmd);
c66ac9db
NB		 3602 }
3603}
3604EXPORT_SYMBOL(transport_generic_free_cmd);
3605
a17f091d
NB		 3606/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3607 * @se_sess: session to reference
3608 * @se_cmd: command descriptor to add
a6360785 3609 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 3610 */
a6360785
NB		 3611void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3612 bool ack_kref)
a17f091d
NB		 3613{
3614 unsigned long flags;
3615
7481deb4 3616 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 3617 /*
3618 * Add a second kref if the fabric caller is expecting to handle
3619 * fabric acknowledgement that requires two target_put_sess_cmd()
3620 * invocations before se_cmd descriptor release.
3621 */
86715569 3622 if (ack_kref == true) {
a6360785 3623 kref_get(&se_cmd->cmd_kref);
86715569
NB		 3624 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
3625 }
7481deb4 3626
a17f091d
NB		 3627 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3628 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3629 se_cmd->check_release = 1;
3630 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3631}
3632EXPORT_SYMBOL(target_get_sess_cmd);
3633
7481deb4 3634static void target_release_cmd_kref(struct kref *kref)
a17f091d 3635{
7481deb4
NB		 3636 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3637 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 3638 unsigned long flags;
3639
3640 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3641 if (list_empty(&se_cmd->se_cmd_list)) {
3642 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 3643 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 3644 return;
a17f091d 3645 }
a17f091d
NB		 3646 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3647 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3648 complete(&se_cmd->cmd_wait_comp);
7481deb4 3649 return;
a17f091d
NB		 3650 }
3651 list_del(&se_cmd->se_cmd_list);
3652 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3653
7481deb4
NB		 3654 se_cmd->se_tfo->release_cmd(se_cmd);
3655}
3656
3657/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
3658 * @se_sess: session to reference
3659 * @se_cmd: command descriptor to drop
3660 */
3661int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3662{
3663 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 3664}
3665EXPORT_SYMBOL(target_put_sess_cmd);
3666
3667/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3668 * @se_sess: session to split
3669 */
3670void target_splice_sess_cmd_list(struct se_session *se_sess)
3671{
3672 struct se_cmd *se_cmd;
3673 unsigned long flags;
3674
3675 WARN_ON(!list_empty(&se_sess->sess_wait_list));
3676 INIT_LIST_HEAD(&se_sess->sess_wait_list);
3677
3678 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3679 se_sess->sess_tearing_down = 1;
3680
3681 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3682
3683 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3684 se_cmd->cmd_wait_set = 1;
3685
3686 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3687}
3688EXPORT_SYMBOL(target_splice_sess_cmd_list);
3689
3690/* target_wait_for_sess_cmds - Wait for outstanding descriptors
3691 * @se_sess: session to wait for active I/O
3692 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3693 */
3694void target_wait_for_sess_cmds(
3695 struct se_session *se_sess,
3696 int wait_for_tasks)
3697{
3698 struct se_cmd *se_cmd, *tmp_cmd;
3699 bool rc = false;
3700
3701 list_for_each_entry_safe(se_cmd, tmp_cmd,
3702 &se_sess->sess_wait_list, se_cmd_list) {
3703 list_del(&se_cmd->se_cmd_list);
3704
3705 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3706 " %d\n", se_cmd, se_cmd->t_state,
3707 se_cmd->se_tfo->get_cmd_state(se_cmd));
3708
3709 if (wait_for_tasks) {
3710 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3711 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3712 se_cmd->se_tfo->get_cmd_state(se_cmd));
3713
3714 rc = transport_wait_for_tasks(se_cmd);
3715
3716 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3717 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3718 se_cmd->se_tfo->get_cmd_state(se_cmd));
3719 }
3720
3721 if (!rc) {
3722 wait_for_completion(&se_cmd->cmd_wait_comp);
3723 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
3724 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3725 se_cmd->se_tfo->get_cmd_state(se_cmd));
3726 }
3727
3728 se_cmd->se_tfo->release_cmd(se_cmd);
3729 }
3730}
3731EXPORT_SYMBOL(target_wait_for_sess_cmds);
3732
c66ac9db
NB		 3733/* transport_lun_wait_for_tasks():
3734 *
3735 * Called from ConfigFS context to stop the passed struct se_cmd to allow
3736 * an struct se_lun to be successfully shutdown.
3737 */
3738static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
3739{
3740 unsigned long flags;
cf572a96
CH		 3741 int ret = 0;
3742
c66ac9db
NB		 3743 /*
3744 * If the frontend has already requested this struct se_cmd to
3745 * be stopped, we can safely ignore this struct se_cmd.
3746 */
a1d8b49a 3747 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 3748 if (cmd->transport_state & CMD_T_STOP) {
3749 cmd->transport_state &= ~CMD_T_LUN_STOP;
3750
3751 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
3752 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 3753 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3754 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 3755 return -EPERM;
c66ac9db 3756 }
7d680f3b 3757 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 3758 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3759
5951146d 3760 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 3761
cf572a96
CH		 3762 // XXX: audit task_flags checks.
3763 spin_lock_irqsave(&cmd->t_state_lock, flags);
3764 if ((cmd->transport_state & CMD_T_BUSY) &&
3765 (cmd->transport_state & CMD_T_SENT)) {
3766 if (!target_stop_cmd(cmd, &flags))
3767 ret++;
23019170 3768 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96
CH		 3769 } else {
3770 spin_unlock_irqrestore(&cmd->t_state_lock,
3771 flags);
3772 target_remove_from_execute_list(cmd);
3773 }
c66ac9db 3774
785fdf70
CH		 3775 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
3776 " %d\n", cmd, ret);
c66ac9db 3777 if (!ret) {
6708bb27 3778 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 3779 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 3780 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 3781 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 3782 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3783 }
3df8d40b 3784 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 3785
3786 return 0;
3787}
3788
c66ac9db
NB		 3789static void __transport_clear_lun_from_sessions(struct se_lun *lun)
3790{
3791 struct se_cmd *cmd = NULL;
3792 unsigned long lun_flags, cmd_flags;
3793 /*
3794 * Do exception processing and return CHECK_CONDITION status to the
3795 * Initiator Port.
3796 */
3797 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 3798 while (!list_empty(&lun->lun_cmd_list)) {
3799 cmd = list_first_entry(&lun->lun_cmd_list,
3800 struct se_cmd, se_lun_node);
3d26fea0 3801 list_del_init(&cmd->se_lun_node);
5951146d 3802
c66ac9db
NB		 3803 /*
3804 * This will notify iscsi_target_transport.c:
3805 * transport_cmd_check_stop() that a LUN shutdown is in
3806 * progress for the iscsi_cmd_t.
3807 */
a1d8b49a 3808 spin_lock(&cmd->t_state_lock);
6708bb27 3809 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 3810 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 3811 cmd->se_lun->unpacked_lun,
3812 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 3813 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 3814 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 3815
3816 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3817
6708bb27
AG		 3818 if (!cmd->se_lun) {
3819 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 3820 cmd->se_tfo->get_task_tag(cmd),
3821 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 3822 BUG();
3823 }
3824 /*
3825 * If the Storage engine still owns the iscsi_cmd_t, determine
3826 * and/or stop its context.
3827 */
6708bb27 3828 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 3829 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
3830 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3831
e3d6f909 3832 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 3833 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3834 continue;
3835 }
3836
6708bb27 3837 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 3838 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 3839 cmd->se_lun->unpacked_lun,
3840 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3841
a1d8b49a 3842 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 3843 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 3844 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 3845 goto check_cond;
3846 }
7d680f3b 3847 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 3848 target_remove_from_state_list(cmd);
a1d8b49a 3849 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 3850
c66ac9db
NB		 3851 /*
3852 * The Storage engine stopped this struct se_cmd before it was
3853 * send to the fabric frontend for delivery back to the
3854 * Initiator Node. Return this SCSI CDB back with an
3855 * CHECK_CONDITION status.
3856 */
3857check_cond:
3858 transport_send_check_condition_and_sense(cmd,
3859 TCM_NON_EXISTENT_LUN, 0);
3860 /*
3861 * If the fabric frontend is waiting for this iscsi_cmd_t to
3862 * be released, notify the waiting thread now that LU has
3863 * finished accessing it.
3864 */
a1d8b49a 3865 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 3866 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 3867 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 3868 " struct se_cmd: %p ITT: 0x%08x\n",
3869 lun->unpacked_lun,
e3d6f909 3870 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3871
a1d8b49a 3872 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3873 cmd_flags);
3874 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 3875 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 3876 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3877 continue;
3878 }
6708bb27 3879 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 3880 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3881
a1d8b49a 3882 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 3883 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3884 }
3885 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3886}
3887
3888static int transport_clear_lun_thread(void *p)
3889{
8359cf43 3890 struct se_lun *lun = p;
c66ac9db
NB		 3891
3892 __transport_clear_lun_from_sessions(lun);
3893 complete(&lun->lun_shutdown_comp);
3894
3895 return 0;
3896}
3897
3898int transport_clear_lun_from_sessions(struct se_lun *lun)
3899{
3900 struct task_struct *kt;
3901
5951146d 3902 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 3903 "tcm_cl_%u", lun->unpacked_lun);
3904 if (IS_ERR(kt)) {
6708bb27 3905 pr_err("Unable to start clear_lun thread\n");
e3d6f909 3906 return PTR_ERR(kt);
c66ac9db
NB		 3907 }
3908 wait_for_completion(&lun->lun_shutdown_comp);
3909
3910 return 0;
3911}
3912
d14921d6
NB		 3913/**
3914 * transport_wait_for_tasks - wait for completion to occur
3915 * @cmd: command to wait
c66ac9db 3916 *
d14921d6
NB		 3917 * Called from frontend fabric context to wait for storage engine
3918 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 3919 */
a17f091d 3920bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 3921{
3922 unsigned long flags;
3923
a1d8b49a 3924 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 3925 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
3926 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 3927 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 3928 return false;
d14921d6
NB		 3929 }
3930 /*
3931 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
3932 * has been set in transport_set_supported_SAM_opcode().
3933 */
c8e31f26
AG		 3934 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
3935 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 3936 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 3937 return false;
d14921d6 3938 }
c66ac9db
NB		 3939 /*
3940 * If we are already stopped due to an external event (ie: LUN shutdown)
3941 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 3942 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 3943 * transport_clear_lun_from_sessions() once the ConfigFS context caller
3944 * has completed its operation on the struct se_cmd.
3945 */
7d680f3b 3946 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 3947 pr_debug("wait_for_tasks: Stopping"
e3d6f909 3948 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 3949 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 3950 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 3951 /*
3952 * There is a special case for WRITES where a FE exception +
3953 * LUN shutdown means ConfigFS context is still sleeping on
3954 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
3955 * We go ahead and up transport_lun_stop_comp just to be sure
3956 * here.
3957 */
a1d8b49a
AG		 3958 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3959 complete(&cmd->transport_lun_stop_comp);
3960 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
3961 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3962
cf572a96 3963 target_remove_from_state_list(cmd);
c66ac9db
NB		 3964 /*
3965 * At this point, the frontend who was the originator of this
3966 * struct se_cmd, now owns the structure and can be released through
3967 * normal means below.
3968 */
6708bb27 3969 pr_debug("wait_for_tasks: Stopped"
e3d6f909 3970 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 3971 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 3972 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 3973
7d680f3b 3974 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 3975 }
7d680f3b 3976
3d28934a 3977 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 3978 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 3979 return false;
d14921d6 3980 }
c66ac9db 3981
7d680f3b 3982 cmd->transport_state |= CMD_T_STOP;
c66ac9db 3983
6708bb27 3984 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 3985 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 3986 cmd, cmd->se_tfo->get_task_tag(cmd),
3987 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 3988
a1d8b49a 3989 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3990
5951146d 3991 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 3992
a1d8b49a 3993 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 3994
a1d8b49a 3995 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 3996 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 3997
6708bb27 3998 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 3999 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4000 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4001
d14921d6 4002 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4003
4004 return true;
c66ac9db 4005}
d14921d6 4006EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4007
4008static int transport_get_sense_codes(
4009 struct se_cmd *cmd,
4010 u8 *asc,
4011 u8 *ascq)
4012{
4013 *asc = cmd->scsi_asc;
4014 *ascq = cmd->scsi_ascq;
4015
4016 return 0;
4017}
4018
4019static int transport_set_sense_codes(
4020 struct se_cmd *cmd,
4021 u8 asc,
4022 u8 ascq)
4023{
4024 cmd->scsi_asc = asc;
4025 cmd->scsi_ascq = ascq;
4026
4027 return 0;
4028}
4029
4030int transport_send_check_condition_and_sense(
4031 struct se_cmd *cmd,
4032 u8 reason,
4033 int from_transport)
4034{
4035 unsigned char *buffer = cmd->sense_buffer;
4036 unsigned long flags;
4037 int offset;
4038 u8 asc = 0, ascq = 0;
4039
a1d8b49a 4040 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4041 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4042 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4043 return 0;
4044 }
4045 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4046 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4047
4048 if (!reason && from_transport)
4049 goto after_reason;
4050
4051 if (!from_transport)
4052 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4053 /*
4054 * Data Segment and SenseLength of the fabric response PDU.
4055 *
4056 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4057 * from include/scsi/scsi_cmnd.h
4058 */
e3d6f909 4059 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4060 TRANSPORT_SENSE_BUFFER);
4061 /*
4062 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4063 * SENSE KEY values from include/scsi/scsi.h
4064 */
4065 switch (reason) {
4066 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4067 /* CURRENT ERROR */
4068 buffer[offset] = 0x70;
895f3022 4069 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 4070 /* ILLEGAL REQUEST */
4071 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4072 /* LOGICAL UNIT NOT SUPPORTED */
4073 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4074 break;
c66ac9db
NB		 4075 case TCM_UNSUPPORTED_SCSI_OPCODE:
4076 case TCM_SECTOR_COUNT_TOO_MANY:
4077 /* CURRENT ERROR */
4078 buffer[offset] = 0x70;
895f3022 4079 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4080 /* ILLEGAL REQUEST */
4081 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4082 /* INVALID COMMAND OPERATION CODE */
4083 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4084 break;
4085 case TCM_UNKNOWN_MODE_PAGE:
4086 /* CURRENT ERROR */
4087 buffer[offset] = 0x70;
895f3022 4088 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4089 /* ILLEGAL REQUEST */
4090 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4091 /* INVALID FIELD IN CDB */
4092 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4093 break;
4094 case TCM_CHECK_CONDITION_ABORT_CMD:
4095 /* CURRENT ERROR */
4096 buffer[offset] = 0x70;
895f3022 4097 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4098 /* ABORTED COMMAND */
4099 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4100 /* BUS DEVICE RESET FUNCTION OCCURRED */
4101 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4102 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4103 break;
4104 case TCM_INCORRECT_AMOUNT_OF_DATA:
4105 /* CURRENT ERROR */
4106 buffer[offset] = 0x70;
895f3022 4107 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4108 /* ABORTED COMMAND */
4109 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4110 /* WRITE ERROR */
4111 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4112 /* NOT ENOUGH UNSOLICITED DATA */
4113 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4114 break;
4115 case TCM_INVALID_CDB_FIELD:
4116 /* CURRENT ERROR */
4117 buffer[offset] = 0x70;
895f3022 4118 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4119 /* ILLEGAL REQUEST */
4120 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4121 /* INVALID FIELD IN CDB */
4122 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4123 break;
4124 case TCM_INVALID_PARAMETER_LIST:
4125 /* CURRENT ERROR */
4126 buffer[offset] = 0x70;
895f3022 4127 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4128 /* ILLEGAL REQUEST */
4129 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4130 /* INVALID FIELD IN PARAMETER LIST */
4131 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4132 break;
4133 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4134 /* CURRENT ERROR */
4135 buffer[offset] = 0x70;
895f3022 4136 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4137 /* ABORTED COMMAND */
4138 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4139 /* WRITE ERROR */
4140 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4141 /* UNEXPECTED_UNSOLICITED_DATA */
4142 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4143 break;
4144 case TCM_SERVICE_CRC_ERROR:
4145 /* CURRENT ERROR */
4146 buffer[offset] = 0x70;
895f3022 4147 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4148 /* ABORTED COMMAND */
4149 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4150 /* PROTOCOL SERVICE CRC ERROR */
4151 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4152 /* N/A */
4153 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4154 break;
4155 case TCM_SNACK_REJECTED:
4156 /* CURRENT ERROR */
4157 buffer[offset] = 0x70;
895f3022 4158 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4159 /* ABORTED COMMAND */
4160 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4161 /* READ ERROR */
4162 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4163 /* FAILED RETRANSMISSION REQUEST */
4164 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4165 break;
4166 case TCM_WRITE_PROTECTED:
4167 /* CURRENT ERROR */
4168 buffer[offset] = 0x70;
895f3022 4169 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4170 /* DATA PROTECT */
4171 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4172 /* WRITE PROTECTED */
4173 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4174 break;
4175 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4176 /* CURRENT ERROR */
4177 buffer[offset] = 0x70;
895f3022 4178 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4179 /* UNIT ATTENTION */
4180 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4181 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4182 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4183 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4184 break;
4185 case TCM_CHECK_CONDITION_NOT_READY:
4186 /* CURRENT ERROR */
4187 buffer[offset] = 0x70;
895f3022 4188 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4189 /* Not Ready */
4190 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4191 transport_get_sense_codes(cmd, &asc, &ascq);
4192 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4193 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4194 break;
4195 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4196 default:
4197 /* CURRENT ERROR */
4198 buffer[offset] = 0x70;
895f3022 4199 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4200 /* ILLEGAL REQUEST */
4201 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4202 /* LOGICAL UNIT COMMUNICATION FAILURE */
4203 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4204 break;
4205 }
4206 /*
4207 * This code uses linux/include/scsi/scsi.h SAM status codes!
4208 */
4209 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4210 /*
4211 * Automatically padded, this value is encoded in the fabric's
4212 * data_length response PDU containing the SCSI defined sense data.
4213 */
4214 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4215
4216after_reason:
07bde79a 4217 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4218}
4219EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4220
4221int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4222{
4223 int ret = 0;
4224
7d680f3b 4225 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 4226 if (!send_status ||
c66ac9db
NB		 4227 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4228 return 1;
8b1e1244 4229
6708bb27 4230 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4231 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4232 cmd->t_task_cdb[0],
e3d6f909 4233 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 4234
c66ac9db 4235 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4236 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4237 ret = 1;
4238 }
4239 return ret;
4240}
4241EXPORT_SYMBOL(transport_check_aborted_status);
4242
4243void transport_send_task_abort(struct se_cmd *cmd)
4244{
c252f003
NB		 4245 unsigned long flags;
4246
4247 spin_lock_irqsave(&cmd->t_state_lock, flags);
4248 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4249 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4250 return;
4251 }
4252 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4253
c66ac9db
NB		 4254 /*
4255 * If there are still expected incoming fabric WRITEs, we wait
4256 * until until they have completed before sending a TASK_ABORTED
4257 * response. This response with TASK_ABORTED status will be
4258 * queued back to fabric module by transport_check_aborted_status().
4259 */
4260 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4261 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 4262 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 4263 smp_mb__after_atomic_inc();
c66ac9db
NB		 4264 }
4265 }
4266 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 4267
6708bb27 4268 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4269 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4270 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 4271
e3d6f909 4272 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4273}
4274
e26d99ae 4275static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4276{
5951146d 4277 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4278 struct se_tmr_req *tmr = cmd->se_tmr_req;
4279 int ret;
4280
4281 switch (tmr->function) {
5c6cd613 4282 case TMR_ABORT_TASK:
3d28934a 4283 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 4284 break;
5c6cd613
NB		 4285 case TMR_ABORT_TASK_SET:
4286 case TMR_CLEAR_ACA:
4287 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4288 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4289 break;
5c6cd613 4290 case TMR_LUN_RESET:
c66ac9db
NB		 4291 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4292 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4293 TMR_FUNCTION_REJECTED;
4294 break;
5c6cd613 4295 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4296 tmr->response = TMR_FUNCTION_REJECTED;
4297 break;
5c6cd613 4298 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4299 tmr->response = TMR_FUNCTION_REJECTED;
4300 break;
c66ac9db 4301 default:
6708bb27 4302 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4303 tmr->function);
4304 tmr->response = TMR_FUNCTION_REJECTED;
4305 break;
4306 }
4307
4308 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4309 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4310
b7b8bef7 4311 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4312 return 0;
4313}
4314
c66ac9db
NB		 4315/* transport_processing_thread():
4316 *
4317 *
4318 */
4319static int transport_processing_thread(void *param)
4320{
5951146d 4321 int ret;
c66ac9db 4322 struct se_cmd *cmd;
8359cf43 4323 struct se_device *dev = param;
c66ac9db 4324
c66ac9db 4325 while (!kthread_should_stop()) {
e3d6f909
AG		 4326 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4327 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4328 kthread_should_stop());
4329 if (ret < 0)
4330 goto out;
4331
c66ac9db 4332get_cmd:
5951146d
AG		 4333 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4334 if (!cmd)
c66ac9db
NB		 4335 continue;
4336
5951146d 4337 switch (cmd->t_state) {
680b73c5
CH		 4338 case TRANSPORT_NEW_CMD:
4339 BUG();
4340 break;
c66ac9db 4341 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4342 if (!cmd->se_tfo->new_cmd_map) {
4343 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4344 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4345 BUG();
4346 }
e3d6f909 4347 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4348 if (ret < 0) {
03e98c9e 4349 transport_generic_request_failure(cmd);
c66ac9db
NB		 4350 break;
4351 }
c66ac9db 4352 ret = transport_generic_new_cmd(cmd);
f147abb4 4353 if (ret < 0) {
03e98c9e
NB		 4354 transport_generic_request_failure(cmd);
4355 break;
c66ac9db
NB		 4356 }
4357 break;
4358 case TRANSPORT_PROCESS_WRITE:
4359 transport_generic_process_write(cmd);
4360 break;
c66ac9db
NB		 4361 case TRANSPORT_PROCESS_TMR:
4362 transport_generic_do_tmr(cmd);
4363 break;
07bde79a 4364 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4365 transport_write_pending_qf(cmd);
4366 break;
4367 case TRANSPORT_COMPLETE_QF_OK:
4368 transport_complete_qf(cmd);
07bde79a 4369 break;
c66ac9db 4370 default:
f2da9dbd
CH		 4371 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4372 "i_state: %d on SE LUN: %u\n",
4373 cmd->t_state,
e3d6f909
AG		 4374 cmd->se_tfo->get_task_tag(cmd),
4375 cmd->se_tfo->get_cmd_state(cmd),
4376 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4377 BUG();
4378 }
4379
4380 goto get_cmd;
4381 }
4382
4383out:
cf572a96 4384 WARN_ON(!list_empty(&dev->state_list));
ce8762f6 4385 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4386 dev->process_thread = NULL;
4387 return 0;
4388}
Linux kernel - Deliverables
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