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target/iblock: Add WRITE_SAME w/ UNMAP=0 emulation support
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
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
35e0e757 58static struct workqueue_struct *target_completion_wq;
c66ac9db 59static struct kmem_cache *se_sess_cache;
c66ac9db 60struct kmem_cache *se_ua_cache;
c66ac9db
NB		 61struct kmem_cache *t10_pr_reg_cache;
62struct kmem_cache *t10_alua_lu_gp_cache;
63struct kmem_cache *t10_alua_lu_gp_mem_cache;
64struct kmem_cache *t10_alua_tg_pt_gp_cache;
65struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
66
c66ac9db 67static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 68static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 69 struct se_device *dev);
05d1c7c0 70static int transport_generic_get_mem(struct se_cmd *cmd);
bc187ea6 71static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
39c05f32 72static void transport_put_cmd(struct se_cmd *cmd);
35e0e757 73static void target_complete_ok_work(struct work_struct *work);
c66ac9db 74
e3d6f909 75int init_se_kmem_caches(void)
c66ac9db 76{
c66ac9db
NB		 77 se_sess_cache = kmem_cache_create("se_sess_cache",
78 sizeof(struct se_session), __alignof__(struct se_session),
79 0, NULL);
6708bb27
AG		 80 if (!se_sess_cache) {
81 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 82 " failed\n");
c8e31f26 83 goto out;
c66ac9db
NB		 84 }
85 se_ua_cache = kmem_cache_create("se_ua_cache",
86 sizeof(struct se_ua), __alignof__(struct se_ua),
87 0, NULL);
6708bb27
AG		 88 if (!se_ua_cache) {
89 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 90 goto out_free_sess_cache;
c66ac9db 91 }
c66ac9db
NB		 92 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
93 sizeof(struct t10_pr_registration),
94 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 95 if (!t10_pr_reg_cache) {
96 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 97 " failed\n");
35e0e757 98 goto out_free_ua_cache;
c66ac9db
NB		 99 }
100 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
101 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
102 0, NULL);
6708bb27
AG		 103 if (!t10_alua_lu_gp_cache) {
104 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 105 " failed\n");
35e0e757 106 goto out_free_pr_reg_cache;
c66ac9db
NB		 107 }
108 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
109 sizeof(struct t10_alua_lu_gp_member),
110 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 111 if (!t10_alua_lu_gp_mem_cache) {
112 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 113 "cache failed\n");
35e0e757 114 goto out_free_lu_gp_cache;
c66ac9db
NB		 115 }
116 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
117 sizeof(struct t10_alua_tg_pt_gp),
118 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 119 if (!t10_alua_tg_pt_gp_cache) {
120 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 121 "cache failed\n");
35e0e757 122 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 123 }
124 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
125 "t10_alua_tg_pt_gp_mem_cache",
126 sizeof(struct t10_alua_tg_pt_gp_member),
127 __alignof__(struct t10_alua_tg_pt_gp_member),
128 0, NULL);
6708bb27
AG		 129 if (!t10_alua_tg_pt_gp_mem_cache) {
130 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 131 "mem_t failed\n");
35e0e757 132 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 133 }
134
35e0e757
CH		 135 target_completion_wq = alloc_workqueue("target_completion",
136 WQ_MEM_RECLAIM, 0);
137 if (!target_completion_wq)
138 goto out_free_tg_pt_gp_mem_cache;
139
c66ac9db 140 return 0;
35e0e757
CH		 141
142out_free_tg_pt_gp_mem_cache:
143 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
144out_free_tg_pt_gp_cache:
145 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
146out_free_lu_gp_mem_cache:
147 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
148out_free_lu_gp_cache:
149 kmem_cache_destroy(t10_alua_lu_gp_cache);
150out_free_pr_reg_cache:
151 kmem_cache_destroy(t10_pr_reg_cache);
152out_free_ua_cache:
153 kmem_cache_destroy(se_ua_cache);
154out_free_sess_cache:
155 kmem_cache_destroy(se_sess_cache);
c66ac9db 156out:
e3d6f909 157 return -ENOMEM;
c66ac9db
NB		 158}
159
e3d6f909 160void release_se_kmem_caches(void)
c66ac9db 161{
35e0e757 162 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 163 kmem_cache_destroy(se_sess_cache);
164 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 165 kmem_cache_destroy(t10_pr_reg_cache);
166 kmem_cache_destroy(t10_alua_lu_gp_cache);
167 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
168 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
169 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 170}
171
e3d6f909
AG		 172/* This code ensures unique mib indexes are handed out. */
173static DEFINE_SPINLOCK(scsi_mib_index_lock);
174static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 175
176/*
177 * Allocate a new row index for the entry type specified
178 */
179u32 scsi_get_new_index(scsi_index_t type)
180{
181 u32 new_index;
182
e3d6f909 183 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 184
e3d6f909
AG		 185 spin_lock(&scsi_mib_index_lock);
186 new_index = ++scsi_mib_index[type];
187 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 188
189 return new_index;
190}
191
dbc5623e 192void transport_subsystem_check_init(void)
c66ac9db
NB		 193{
194 int ret;
283669d2 195 static int sub_api_initialized;
c66ac9db 196
dbc5623e
NB		 197 if (sub_api_initialized)
198 return;
199
c66ac9db
NB		 200 ret = request_module("target_core_iblock");
201 if (ret != 0)
6708bb27 202 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 203
204 ret = request_module("target_core_file");
205 if (ret != 0)
6708bb27 206 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 207
208 ret = request_module("target_core_pscsi");
209 if (ret != 0)
6708bb27 210 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 211
e3d6f909 212 sub_api_initialized = 1;
c66ac9db
NB		 213}
214
215struct se_session *transport_init_session(void)
216{
217 struct se_session *se_sess;
218
219 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 220 if (!se_sess) {
221 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 222 " se_sess_cache\n");
223 return ERR_PTR(-ENOMEM);
224 }
225 INIT_LIST_HEAD(&se_sess->sess_list);
226 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 227 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
a17f091d 228 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 229 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 230
231 return se_sess;
232}
233EXPORT_SYMBOL(transport_init_session);
234
235/*
140854cb 236 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 237 */
238void __transport_register_session(
239 struct se_portal_group *se_tpg,
240 struct se_node_acl *se_nacl,
241 struct se_session *se_sess,
242 void *fabric_sess_ptr)
243{
244 unsigned char buf[PR_REG_ISID_LEN];
245
246 se_sess->se_tpg = se_tpg;
247 se_sess->fabric_sess_ptr = fabric_sess_ptr;
248 /*
249 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
250 *
251 * Only set for struct se_session's that will actually be moving I/O.
252 * eg: *NOT* discovery sessions.
253 */
254 if (se_nacl) {
255 /*
256 * If the fabric module supports an ISID based TransportID,
257 * save this value in binary from the fabric I_T Nexus now.
258 */
e3d6f909 259 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 260 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 261 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 262 &buf[0], PR_REG_ISID_LEN);
263 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
264 }
afb999ff
NB		 265 kref_get(&se_nacl->acl_kref);
266
c66ac9db
NB		 267 spin_lock_irq(&se_nacl->nacl_sess_lock);
268 /*
269 * The se_nacl->nacl_sess pointer will be set to the
270 * last active I_T Nexus for each struct se_node_acl.
271 */
272 se_nacl->nacl_sess = se_sess;
273
274 list_add_tail(&se_sess->sess_acl_list,
275 &se_nacl->acl_sess_list);
276 spin_unlock_irq(&se_nacl->nacl_sess_lock);
277 }
278 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
279
6708bb27 280 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 281 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 282}
283EXPORT_SYMBOL(__transport_register_session);
284
285void transport_register_session(
286 struct se_portal_group *se_tpg,
287 struct se_node_acl *se_nacl,
288 struct se_session *se_sess,
289 void *fabric_sess_ptr)
290{
140854cb
NB		 291 unsigned long flags;
292
293 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 294 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 295 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 296}
297EXPORT_SYMBOL(transport_register_session);
298
ecf0dd66 299static void target_release_session(struct kref *kref)
41ac82b6
NB		 300{
301 struct se_session *se_sess = container_of(kref,
302 struct se_session, sess_kref);
303 struct se_portal_group *se_tpg = se_sess->se_tpg;
304
305 se_tpg->se_tpg_tfo->close_session(se_sess);
306}
307
308void target_get_session(struct se_session *se_sess)
309{
310 kref_get(&se_sess->sess_kref);
311}
312EXPORT_SYMBOL(target_get_session);
313
33933a0e 314void target_put_session(struct se_session *se_sess)
41ac82b6 315{
4149268e
JE		 316 struct se_portal_group *tpg = se_sess->se_tpg;
317
318 if (tpg->se_tpg_tfo->put_session != NULL) {
319 tpg->se_tpg_tfo->put_session(se_sess);
320 return;
321 }
33933a0e 322 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 323}
324EXPORT_SYMBOL(target_put_session);
325
afb999ff
NB		 326static void target_complete_nacl(struct kref *kref)
327{
328 struct se_node_acl *nacl = container_of(kref,
329 struct se_node_acl, acl_kref);
330
331 complete(&nacl->acl_free_comp);
332}
333
334void target_put_nacl(struct se_node_acl *nacl)
335{
336 kref_put(&nacl->acl_kref, target_complete_nacl);
337}
338
c66ac9db
NB		 339void transport_deregister_session_configfs(struct se_session *se_sess)
340{
341 struct se_node_acl *se_nacl;
23388864 342 unsigned long flags;
c66ac9db
NB		 343 /*
344 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
345 */
346 se_nacl = se_sess->se_node_acl;
6708bb27 347 if (se_nacl) {
23388864 348 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 349 if (se_nacl->acl_stop == 0)
350 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 351 /*
352 * If the session list is empty, then clear the pointer.
353 * Otherwise, set the struct se_session pointer from the tail
354 * element of the per struct se_node_acl active session list.
355 */
356 if (list_empty(&se_nacl->acl_sess_list))
357 se_nacl->nacl_sess = NULL;
358 else {
359 se_nacl->nacl_sess = container_of(
360 se_nacl->acl_sess_list.prev,
361 struct se_session, sess_acl_list);
362 }
23388864 363 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 364 }
365}
366EXPORT_SYMBOL(transport_deregister_session_configfs);
367
368void transport_free_session(struct se_session *se_sess)
369{
370 kmem_cache_free(se_sess_cache, se_sess);
371}
372EXPORT_SYMBOL(transport_free_session);
373
374void transport_deregister_session(struct se_session *se_sess)
375{
376 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 377 struct target_core_fabric_ops *se_tfo;
c66ac9db 378 struct se_node_acl *se_nacl;
e63a8e19 379 unsigned long flags;
01468346 380 bool comp_nacl = true;
c66ac9db 381
6708bb27 382 if (!se_tpg) {
c66ac9db
NB		 383 transport_free_session(se_sess);
384 return;
385 }
01468346 386 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 387
e63a8e19 388 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 389 list_del(&se_sess->sess_list);
390 se_sess->se_tpg = NULL;
391 se_sess->fabric_sess_ptr = NULL;
e63a8e19 392 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 393
394 /*
395 * Determine if we need to do extra work for this initiator node's
396 * struct se_node_acl if it had been previously dynamically generated.
397 */
398 se_nacl = se_sess->se_node_acl;
01468346
NB		 399
400 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
401 if (se_nacl && se_nacl->dynamic_node_acl) {
402 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
403 list_del(&se_nacl->acl_list);
404 se_tpg->num_node_acls--;
405 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
406 core_tpg_wait_for_nacl_pr_ref(se_nacl);
407 core_free_device_list_for_node(se_nacl, se_tpg);
408 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
409
410 comp_nacl = false;
411 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 412 }
c66ac9db 413 }
01468346 414 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 415
6708bb27 416 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 417 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 418 /*
afb999ff
NB		 419 * If last kref is dropping now for an explict NodeACL, awake sleeping
420 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
421 * removal context.
01468346
NB		 422 */
423 if (se_nacl && comp_nacl == true)
afb999ff 424 target_put_nacl(se_nacl);
01468346 425
afb999ff 426 transport_free_session(se_sess);
c66ac9db
NB		 427}
428EXPORT_SYMBOL(transport_deregister_session);
429
430/*
a1d8b49a 431 * Called with cmd->t_state_lock held.
c66ac9db 432 */
cf572a96 433static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 434{
42bf829e 435 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 436 unsigned long flags;
437
42bf829e
CH		 438 if (!dev)
439 return;
c66ac9db 440
cf572a96
CH		 441 if (cmd->transport_state & CMD_T_BUSY)
442 return;
c66ac9db 443
cf572a96
CH		 444 spin_lock_irqsave(&dev->execute_task_lock, flags);
445 if (cmd->state_active) {
446 list_del(&cmd->state_list);
cf572a96 447 cmd->state_active = false;
c66ac9db 448 }
cf572a96 449 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 450}
451
f7113a47 452static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
c66ac9db
NB		 453{
454 unsigned long flags;
455
a1d8b49a 456 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 457 /*
458 * Determine if IOCTL context caller in requesting the stopping of this
459 * command for LUN shutdown purposes.
460 */
7d680f3b
CH		 461 if (cmd->transport_state & CMD_T_LUN_STOP) {
462 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
463 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 464
7d680f3b 465 cmd->transport_state &= ~CMD_T_ACTIVE;
f7113a47 466 if (remove_from_lists)
cf572a96 467 target_remove_from_state_list(cmd);
a1d8b49a 468 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 469
a1d8b49a 470 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 471 return 1;
472 }
f7113a47
CH		 473
474 if (remove_from_lists) {
475 target_remove_from_state_list(cmd);
476
477 /*
478 * Clear struct se_cmd->se_lun before the handoff to FE.
479 */
480 cmd->se_lun = NULL;
481 }
482
c66ac9db
NB		 483 /*
484 * Determine if frontend context caller is requesting the stopping of
e3d6f909 485 * this command for frontend exceptions.
c66ac9db 486 */
7d680f3b
CH		 487 if (cmd->transport_state & CMD_T_STOP) {
488 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
489 __func__, __LINE__,
e3d6f909 490 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 491
a1d8b49a 492 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 493
a1d8b49a 494 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 495 return 1;
496 }
f7113a47
CH		 497
498 cmd->transport_state &= ~CMD_T_ACTIVE;
499 if (remove_from_lists) {
500 /*
501 * Some fabric modules like tcm_loop can release
502 * their internally allocated I/O reference now and
503 * struct se_cmd now.
504 *
505 * Fabric modules are expected to return '1' here if the
506 * se_cmd being passed is released at this point,
507 * or zero if not being released.
508 */
509 if (cmd->se_tfo->check_stop_free != NULL) {
510 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
511 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 512 }
f7113a47 513 }
c66ac9db 514
a1d8b49a 515 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 516 return 0;
517}
518
519static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
520{
f7113a47 521 return transport_cmd_check_stop(cmd, true);
c66ac9db
NB		 522}
523
524static void transport_lun_remove_cmd(struct se_cmd *cmd)
525{
e3d6f909 526 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 527 unsigned long flags;
528
529 if (!lun)
530 return;
531
a1d8b49a 532 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 533 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
534 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 535 target_remove_from_state_list(cmd);
c66ac9db 536 }
a1d8b49a 537 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 538
c66ac9db 539 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 540 if (!list_empty(&cmd->se_lun_node))
541 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 542 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
543}
544
545void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
546{
c8e31f26 547 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
8dc52b54 548 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 549
550 if (transport_cmd_check_stop_to_fabric(cmd))
551 return;
af877292 552 if (remove)
e6a2573f 553 transport_put_cmd(cmd);
c66ac9db
NB		 554}
555
35e0e757
CH		 556static void target_complete_failure_work(struct work_struct *work)
557{
558 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
559
de103c93
CH		 560 transport_generic_request_failure(cmd,
561 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 562}
563
6138ed2a 564/*
d5829eac
PB		 565 * Used when asking transport to copy Sense Data from the underlying
566 * Linux/SCSI struct scsi_cmnd
6138ed2a 567 */
d5829eac 568static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 569{
6138ed2a 570 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 571
572 WARN_ON(!cmd->se_lun);
573
574 if (!dev)
d5829eac 575 return NULL;
6138ed2a 576
d5829eac
PB		 577 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
578 return NULL;
6138ed2a 579
9c58b7dd 580 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 581
d5829eac 582 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 583 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 584 return cmd->sense_buffer;
6138ed2a
PB		 585}
586
5787cacd 587void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 588{
42bf829e 589 struct se_device *dev = cmd->se_dev;
5787cacd 590 int success = scsi_status == GOOD;
c66ac9db 591 unsigned long flags;
c66ac9db 592
5787cacd
CH		 593 cmd->scsi_status = scsi_status;
594
595
a1d8b49a 596 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 597 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 598
c66ac9db 599 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 600 dev->transport->transport_complete(cmd,
601 cmd->t_data_sg,
602 transport_get_sense_buffer(cmd));
603 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 604 success = 1;
c66ac9db
NB		 605 }
606
607 /*
5787cacd 608 * See if we are waiting to complete for an exception condition.
c66ac9db 609 */
cf572a96 610 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 611 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 612 complete(&cmd->task_stop_comp);
c66ac9db
NB		 613 return;
614 }
2235007c
CH		 615
616 if (!success)
7d680f3b 617 cmd->transport_state |= CMD_T_FAILED;
2235007c 618
3d28934a
NB		 619 /*
620 * Check for case where an explict ABORT_TASK has been received
621 * and transport_wait_for_tasks() will be waiting for completion..
622 */
623 if (cmd->transport_state & CMD_T_ABORTED &&
624 cmd->transport_state & CMD_T_STOP) {
625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
626 complete(&cmd->t_transport_stop_comp);
627 return;
628 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 629 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 630 } else {
35e0e757 631 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 632 }
35e0e757 633
35e0e757 634 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 635 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 636 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 637
35e0e757 638 queue_work(target_completion_wq, &cmd->work);
c66ac9db 639}
6bb35e00
CH		 640EXPORT_SYMBOL(target_complete_cmd);
641
cf572a96 642static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 643{
cf572a96
CH		 644 struct se_device *dev = cmd->se_dev;
645 unsigned long flags;
c66ac9db 646
cf572a96
CH		 647 spin_lock_irqsave(&dev->execute_task_lock, flags);
648 if (!cmd->state_active) {
649 list_add_tail(&cmd->state_list, &dev->state_list);
650 cmd->state_active = true;
c66ac9db 651 }
cf572a96 652 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 653}
654
07bde79a 655/*
f147abb4 656 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 657 */
7a6f0a1e
CH		 658static void transport_write_pending_qf(struct se_cmd *cmd);
659static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 660
0fd97ccf 661void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 662{
663 struct se_device *dev = container_of(work, struct se_device,
664 qf_work_queue);
bcac364a 665 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 666 struct se_cmd *cmd, *cmd_tmp;
667
668 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 669 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
670 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 671
bcac364a 672 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 673 list_del(&cmd->se_qf_node);
674 atomic_dec(&dev->dev_qf_count);
675 smp_mb__after_atomic_dec();
07bde79a 676
6708bb27 677 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 678 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 679 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 680 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
681 : "UNKNOWN");
f7a5cc0b 682
7a6f0a1e
CH		 683 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
684 transport_write_pending_qf(cmd);
685 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
686 transport_complete_qf(cmd);
07bde79a 687 }
07bde79a
NB		 688}
689
c66ac9db
NB		 690unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
691{
692 switch (cmd->data_direction) {
693 case DMA_NONE:
694 return "NONE";
695 case DMA_FROM_DEVICE:
696 return "READ";
697 case DMA_TO_DEVICE:
698 return "WRITE";
699 case DMA_BIDIRECTIONAL:
700 return "BIDI";
701 default:
702 break;
703 }
704
705 return "UNKNOWN";
706}
707
708void transport_dump_dev_state(
709 struct se_device *dev,
710 char *b,
711 int *bl)
712{
713 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 714 if (dev->export_count)
c66ac9db 715 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 716 else
c66ac9db 717 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 718
5f41a31d 719 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 720 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 721 dev->dev_attrib.block_size,
722 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 723 *bl += sprintf(b + *bl, " ");
724}
725
c66ac9db
NB		 726void transport_dump_vpd_proto_id(
727 struct t10_vpd *vpd,
728 unsigned char *p_buf,
729 int p_buf_len)
730{
731 unsigned char buf[VPD_TMP_BUF_SIZE];
732 int len;
733
734 memset(buf, 0, VPD_TMP_BUF_SIZE);
735 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
736
737 switch (vpd->protocol_identifier) {
738 case 0x00:
739 sprintf(buf+len, "Fibre Channel\n");
740 break;
741 case 0x10:
742 sprintf(buf+len, "Parallel SCSI\n");
743 break;
744 case 0x20:
745 sprintf(buf+len, "SSA\n");
746 break;
747 case 0x30:
748 sprintf(buf+len, "IEEE 1394\n");
749 break;
750 case 0x40:
751 sprintf(buf+len, "SCSI Remote Direct Memory Access"
752 " Protocol\n");
753 break;
754 case 0x50:
755 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
756 break;
757 case 0x60:
758 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
759 break;
760 case 0x70:
761 sprintf(buf+len, "Automation/Drive Interface Transport"
762 " Protocol\n");
763 break;
764 case 0x80:
765 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
766 break;
767 default:
768 sprintf(buf+len, "Unknown 0x%02x\n",
769 vpd->protocol_identifier);
770 break;
771 }
772
773 if (p_buf)
774 strncpy(p_buf, buf, p_buf_len);
775 else
6708bb27 776 pr_debug("%s", buf);
c66ac9db
NB		 777}
778
779void
780transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
781{
782 /*
783 * Check if the Protocol Identifier Valid (PIV) bit is set..
784 *
785 * from spc3r23.pdf section 7.5.1
786 */
787 if (page_83[1] & 0x80) {
788 vpd->protocol_identifier = (page_83[0] & 0xf0);
789 vpd->protocol_identifier_set = 1;
790 transport_dump_vpd_proto_id(vpd, NULL, 0);
791 }
792}
793EXPORT_SYMBOL(transport_set_vpd_proto_id);
794
795int transport_dump_vpd_assoc(
796 struct t10_vpd *vpd,
797 unsigned char *p_buf,
798 int p_buf_len)
799{
800 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 801 int ret = 0;
802 int len;
c66ac9db
NB		 803
804 memset(buf, 0, VPD_TMP_BUF_SIZE);
805 len = sprintf(buf, "T10 VPD Identifier Association: ");
806
807 switch (vpd->association) {
808 case 0x00:
809 sprintf(buf+len, "addressed logical unit\n");
810 break;
811 case 0x10:
812 sprintf(buf+len, "target port\n");
813 break;
814 case 0x20:
815 sprintf(buf+len, "SCSI target device\n");
816 break;
817 default:
818 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 819 ret = -EINVAL;
c66ac9db
NB		 820 break;
821 }
822
823 if (p_buf)
824 strncpy(p_buf, buf, p_buf_len);
825 else
6708bb27 826 pr_debug("%s", buf);
c66ac9db
NB		 827
828 return ret;
829}
830
831int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
832{
833 /*
834 * The VPD identification association..
835 *
836 * from spc3r23.pdf Section 7.6.3.1 Table 297
837 */
838 vpd->association = (page_83[1] & 0x30);
839 return transport_dump_vpd_assoc(vpd, NULL, 0);
840}
841EXPORT_SYMBOL(transport_set_vpd_assoc);
842
843int transport_dump_vpd_ident_type(
844 struct t10_vpd *vpd,
845 unsigned char *p_buf,
846 int p_buf_len)
847{
848 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 849 int ret = 0;
850 int len;
c66ac9db
NB		 851
852 memset(buf, 0, VPD_TMP_BUF_SIZE);
853 len = sprintf(buf, "T10 VPD Identifier Type: ");
854
855 switch (vpd->device_identifier_type) {
856 case 0x00:
857 sprintf(buf+len, "Vendor specific\n");
858 break;
859 case 0x01:
860 sprintf(buf+len, "T10 Vendor ID based\n");
861 break;
862 case 0x02:
863 sprintf(buf+len, "EUI-64 based\n");
864 break;
865 case 0x03:
866 sprintf(buf+len, "NAA\n");
867 break;
868 case 0x04:
869 sprintf(buf+len, "Relative target port identifier\n");
870 break;
871 case 0x08:
872 sprintf(buf+len, "SCSI name string\n");
873 break;
874 default:
875 sprintf(buf+len, "Unsupported: 0x%02x\n",
876 vpd->device_identifier_type);
e3d6f909 877 ret = -EINVAL;
c66ac9db
NB		 878 break;
879 }
880
e3d6f909
AG		 881 if (p_buf) {
882 if (p_buf_len < strlen(buf)+1)
883 return -EINVAL;
c66ac9db 884 strncpy(p_buf, buf, p_buf_len);
e3d6f909 885 } else {
6708bb27 886 pr_debug("%s", buf);
e3d6f909 887 }
c66ac9db
NB		 888
889 return ret;
890}
891
892int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
893{
894 /*
895 * The VPD identifier type..
896 *
897 * from spc3r23.pdf Section 7.6.3.1 Table 298
898 */
899 vpd->device_identifier_type = (page_83[1] & 0x0f);
900 return transport_dump_vpd_ident_type(vpd, NULL, 0);
901}
902EXPORT_SYMBOL(transport_set_vpd_ident_type);
903
904int transport_dump_vpd_ident(
905 struct t10_vpd *vpd,
906 unsigned char *p_buf,
907 int p_buf_len)
908{
909 unsigned char buf[VPD_TMP_BUF_SIZE];
910 int ret = 0;
911
912 memset(buf, 0, VPD_TMP_BUF_SIZE);
913
914 switch (vpd->device_identifier_code_set) {
915 case 0x01: /* Binary */
916 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
917 &vpd->device_identifier[0]);
918 break;
919 case 0x02: /* ASCII */
920 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
921 &vpd->device_identifier[0]);
922 break;
923 case 0x03: /* UTF-8 */
924 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
925 &vpd->device_identifier[0]);
926 break;
927 default:
928 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
929 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 930 ret = -EINVAL;
c66ac9db
NB		 931 break;
932 }
933
934 if (p_buf)
935 strncpy(p_buf, buf, p_buf_len);
936 else
6708bb27 937 pr_debug("%s", buf);
c66ac9db
NB		 938
939 return ret;
940}
941
942int
943transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
944{
945 static const char hex_str[] = "0123456789abcdef";
35d1efe8 946 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 947
948 /*
949 * The VPD Code Set (encoding)
950 *
951 * from spc3r23.pdf Section 7.6.3.1 Table 296
952 */
953 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
954 switch (vpd->device_identifier_code_set) {
955 case 0x01: /* Binary */
956 vpd->device_identifier[j++] =
957 hex_str[vpd->device_identifier_type];
958 while (i < (4 + page_83[3])) {
959 vpd->device_identifier[j++] =
960 hex_str[(page_83[i] & 0xf0) >> 4];
961 vpd->device_identifier[j++] =
962 hex_str[page_83[i] & 0x0f];
963 i++;
964 }
965 break;
966 case 0x02: /* ASCII */
967 case 0x03: /* UTF-8 */
968 while (i < (4 + page_83[3]))
969 vpd->device_identifier[j++] = page_83[i++];
970 break;
971 default:
972 break;
973 }
974
975 return transport_dump_vpd_ident(vpd, NULL, 0);
976}
977EXPORT_SYMBOL(transport_set_vpd_ident);
978
de103c93
CH		 979sense_reason_t
980target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 981{
982 struct se_device *dev = cmd->se_dev;
983
984 if (cmd->unknown_data_length) {
985 cmd->data_length = size;
986 } else if (size != cmd->data_length) {
987 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
988 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
989 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
990 cmd->data_length, size, cmd->t_task_cdb[0]);
991
9b3b8041
CH		 992 if (cmd->data_direction == DMA_TO_DEVICE) {
993 pr_err("Rejecting underflow/overflow"
994 " WRITE data\n");
de103c93 995 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 996 }
997 /*
998 * Reject READ_* or WRITE_* with overflow/underflow for
999 * type SCF_SCSI_DATA_CDB.
1000 */
0fd97ccf 1001 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1002 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1003 " CDB on non 512-byte sector setup subsystem"
1004 " plugin: %s\n", dev->transport->name);
1005 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1006 return TCM_INVALID_CDB_FIELD;
9b3b8041 1007 }
4c054ba6
NB		 1008 /*
1009 * For the overflow case keep the existing fabric provided
1010 * ->data_length. Otherwise for the underflow case, reset
1011 * ->data_length to the smaller SCSI expected data transfer
1012 * length.
1013 */
9b3b8041
CH		 1014 if (size > cmd->data_length) {
1015 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1016 cmd->residual_count = (size - cmd->data_length);
1017 } else {
1018 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1019 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1020 cmd->data_length = size;
9b3b8041 1021 }
9b3b8041
CH		 1022 }
1023
1024 return 0;
1025
9b3b8041
CH		 1026}
1027
c66ac9db
NB		 1028/*
1029 * Used by fabric modules containing a local struct se_cmd within their
1030 * fabric dependent per I/O descriptor.
1031 */
1032void transport_init_se_cmd(
1033 struct se_cmd *cmd,
1034 struct target_core_fabric_ops *tfo,
1035 struct se_session *se_sess,
1036 u32 data_length,
1037 int data_direction,
1038 int task_attr,
1039 unsigned char *sense_buffer)
1040{
5951146d
AG		 1041 INIT_LIST_HEAD(&cmd->se_lun_node);
1042 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1043 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1044 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1045 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1046 init_completion(&cmd->transport_lun_fe_stop_comp);
1047 init_completion(&cmd->transport_lun_stop_comp);
1048 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1049 init_completion(&cmd->cmd_wait_comp);
cf572a96 1050 init_completion(&cmd->task_stop_comp);
a1d8b49a 1051 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1052 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1053
1054 cmd->se_tfo = tfo;
1055 cmd->se_sess = se_sess;
1056 cmd->data_length = data_length;
1057 cmd->data_direction = data_direction;
1058 cmd->sam_task_attr = task_attr;
1059 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1060
1061 cmd->state_active = false;
c66ac9db
NB		 1062}
1063EXPORT_SYMBOL(transport_init_se_cmd);
1064
de103c93
CH		 1065static sense_reason_t
1066transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1067{
019c4ca6
CH		 1068 struct se_device *dev = cmd->se_dev;
1069
c66ac9db
NB		 1070 /*
1071 * Check if SAM Task Attribute emulation is enabled for this
1072 * struct se_device storage object
1073 */
019c4ca6 1074 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1075 return 0;
1076
e66ecd50 1077 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1078 pr_debug("SAM Task Attribute ACA"
c66ac9db 1079 " emulation is not supported\n");
de103c93 1080 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1081 }
1082 /*
1083 * Used to determine when ORDERED commands should go from
1084 * Dormant to Active status.
1085 */
019c4ca6 1086 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1087 smp_mb__after_atomic_inc();
6708bb27 1088 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1089 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1090 dev->transport->name);
c66ac9db
NB		 1091 return 0;
1092}
1093
de103c93
CH		 1094sense_reason_t
1095target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1096{
0fd97ccf 1097 struct se_device *dev = cmd->se_dev;
cb4f4d3c 1098 unsigned long flags;
de103c93 1099 sense_reason_t ret;
c66ac9db 1100
c66ac9db
NB		 1101 /*
1102 * Ensure that the received CDB is less than the max (252 + 8) bytes
1103 * for VARIABLE_LENGTH_CMD
1104 */
1105 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1106 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1107 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1108 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1109 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1110 }
1111 /*
1112 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1113 * allocate the additional extended CDB buffer now.. Otherwise
1114 * setup the pointer from __t_task_cdb to t_task_cdb.
1115 */
a1d8b49a
AG		 1116 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1117 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1118 GFP_KERNEL);
6708bb27
AG		 1119 if (!cmd->t_task_cdb) {
1120 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1121 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1122 scsi_command_size(cdb),
a1d8b49a 1123 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1124 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1125 }
1126 } else
a1d8b49a 1127 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1128 /*
a1d8b49a 1129 * Copy the original CDB into cmd->
c66ac9db 1130 */
a1d8b49a 1131 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1132
1133 /*
1134 * Check for an existing UNIT ATTENTION condition
1135 */
de103c93
CH		 1136 ret = target_scsi3_ua_check(cmd);
1137 if (ret)
1138 return ret;
cb4f4d3c 1139
c87fbd56 1140 ret = target_alua_state_check(cmd);
de103c93
CH		 1141 if (ret)
1142 return ret;
cb4f4d3c 1143
d977f437 1144 ret = target_check_reservation(cmd);
de103c93 1145 if (ret)
d977f437 1146 return ret;
cb4f4d3c 1147
0fd97ccf 1148 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1149 if (ret)
1150 return ret;
1151
1152 ret = transport_check_alloc_task_attr(cmd);
1153 if (ret)
c66ac9db 1154 return ret;
cb4f4d3c
CH		 1155
1156 spin_lock_irqsave(&cmd->t_state_lock, flags);
1157 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1158 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1159
c66ac9db
NB		 1160 spin_lock(&cmd->se_lun->lun_sep_lock);
1161 if (cmd->se_lun->lun_sep)
1162 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1163 spin_unlock(&cmd->se_lun->lun_sep_lock);
1164 return 0;
1165}
a12f41f8 1166EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1167
695434e1
NB		 1168/*
1169 * Used by fabric module frontends to queue tasks directly.
1170 * Many only be used from process context only
1171 */
1172int transport_handle_cdb_direct(
1173 struct se_cmd *cmd)
1174{
de103c93 1175 sense_reason_t ret;
dd8ae59d 1176
695434e1
NB		 1177 if (!cmd->se_lun) {
1178 dump_stack();
6708bb27 1179 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1180 return -EINVAL;
1181 }
1182 if (in_interrupt()) {
1183 dump_stack();
6708bb27 1184 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1185 " from interrupt context\n");
1186 return -EINVAL;
1187 }
dd8ae59d 1188 /*
af877292
CH		 1189 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1190 * outstanding descriptors are handled correctly during shutdown via
1191 * transport_wait_for_tasks()
dd8ae59d
NB		 1192 *
1193 * Also, we don't take cmd->t_state_lock here as we only expect
1194 * this to be called for initial descriptor submission.
1195 */
1196 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1197 cmd->transport_state |= CMD_T_ACTIVE;
1198
dd8ae59d
NB		 1199 /*
1200 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1201 * so follow TRANSPORT_NEW_CMD processing thread context usage
1202 * and call transport_generic_request_failure() if necessary..
1203 */
1204 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1205 if (ret)
1206 transport_generic_request_failure(cmd, ret);
dd8ae59d 1207 return 0;
695434e1
NB		 1208}
1209EXPORT_SYMBOL(transport_handle_cdb_direct);
1210
de103c93
CH		 1211static sense_reason_t
1212transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1213 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1214{
1215 if (!sgl || !sgl_count)
1216 return 0;
1217
1218 /*
1219 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1220 * scatterlists already have been set to follow what the fabric
1221 * passes for the original expected data transfer length.
1222 */
1223 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1224 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1225 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1226 return TCM_INVALID_CDB_FIELD;
1227 }
1228
1229 cmd->t_data_sg = sgl;
1230 cmd->t_data_nents = sgl_count;
1231
1232 if (sgl_bidi && sgl_bidi_count) {
1233 cmd->t_bidi_data_sg = sgl_bidi;
1234 cmd->t_bidi_data_nents = sgl_bidi_count;
1235 }
1236 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1237 return 0;
1238}
1239
a026757f
NB		 1240/*
1241 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1242 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1243 *
1244 * @se_cmd: command descriptor to submit
1245 * @se_sess: associated se_sess for endpoint
1246 * @cdb: pointer to SCSI CDB
1247 * @sense: pointer to SCSI sense buffer
1248 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1249 * @data_length: fabric expected data transfer length
1250 * @task_addr: SAM task attribute
1251 * @data_dir: DMA data direction
1252 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1253 * @sgl: struct scatterlist memory for unidirectional mapping
1254 * @sgl_count: scatterlist count for unidirectional mapping
1255 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1256 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1257 *
d6dfc868
RD		 1258 * Returns non zero to signal active I/O shutdown failure. All other
1259 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1260 * but still return zero here.
1261 *
a6360785
NB		 1262 * This may only be called from process context, and also currently
1263 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1264 */
1265int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1266 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1267 u32 data_length, int task_attr, int data_dir, int flags,
1268 struct scatterlist *sgl, u32 sgl_count,
1269 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1270{
1271 struct se_portal_group *se_tpg;
de103c93
CH		 1272 sense_reason_t rc;
1273 int ret;
a6360785
NB		 1274
1275 se_tpg = se_sess->se_tpg;
1276 BUG_ON(!se_tpg);
1277 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1278 BUG_ON(in_interrupt());
1279 /*
1280 * Initialize se_cmd for target operation. From this point
1281 * exceptions are handled by sending exception status via
1282 * target_core_fabric_ops->queue_status() callback
1283 */
1284 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1285 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1286 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1287 se_cmd->unknown_data_length = 1;
a6360785
NB		 1288 /*
1289 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1290 * se_sess->sess_cmd_list. A second kref_get here is necessary
1291 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1292 * kref_put() to happen during fabric packet acknowledgement.
1293 */
de103c93
CH		 1294 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1295 if (ret)
1296 return ret;
a6360785
NB		 1297 /*
1298 * Signal bidirectional data payloads to target-core
1299 */
1300 if (flags & TARGET_SCF_BIDI_OP)
1301 se_cmd->se_cmd_flags |= SCF_BIDI;
1302 /*
1303 * Locate se_lun pointer and attach it to struct se_cmd
1304 */
de103c93
CH		 1305 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1306 if (rc) {
1307 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1308 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1309 return 0;
735703ca 1310 }
d6e0175c 1311
a12f41f8 1312 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1313 if (rc != 0) {
de103c93 1314 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1315 return 0;
735703ca 1316 }
a026757f
NB		 1317 /*
1318 * When a non zero sgl_count has been passed perform SGL passthrough
1319 * mapping for pre-allocated fabric memory instead of having target
1320 * core perform an internal SGL allocation..
1321 */
1322 if (sgl_count != 0) {
1323 BUG_ON(!sgl);
1324
944981c7
NB		 1325 /*
1326 * A work-around for tcm_loop as some userspace code via
1327 * scsi-generic do not memset their associated read buffers,
1328 * so go ahead and do that here for type non-data CDBs. Also
1329 * note that this is currently guaranteed to be a single SGL
1330 * for this case by target core in target_setup_cmd_from_cdb()
1331 * -> transport_generic_cmd_sequencer().
1332 */
1333 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1334 se_cmd->data_direction == DMA_FROM_DEVICE) {
1335 unsigned char *buf = NULL;
1336
1337 if (sgl)
1338 buf = kmap(sg_page(sgl)) + sgl->offset;
1339
1340 if (buf) {
1341 memset(buf, 0, sgl->length);
1342 kunmap(sg_page(sgl));
1343 }
1344 }
1345
a026757f
NB		 1346 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1347 sgl_bidi, sgl_bidi_count);
1348 if (rc != 0) {
de103c93 1349 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1350 return 0;
1351 }
1352 }
11e319ed
AG		 1353 /*
1354 * Check if we need to delay processing because of ALUA
1355 * Active/NonOptimized primary access state..
1356 */
1357 core_alua_check_nonop_delay(se_cmd);
1358
a6360785 1359 transport_handle_cdb_direct(se_cmd);
d6dfc868 1360 return 0;
a6360785 1361}
a026757f
NB		 1362EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1363
1364/*
1365 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1366 *
1367 * @se_cmd: command descriptor to submit
1368 * @se_sess: associated se_sess for endpoint
1369 * @cdb: pointer to SCSI CDB
1370 * @sense: pointer to SCSI sense buffer
1371 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1372 * @data_length: fabric expected data transfer length
1373 * @task_addr: SAM task attribute
1374 * @data_dir: DMA data direction
1375 * @flags: flags for command submission from target_sc_flags_tables
1376 *
1377 * Returns non zero to signal active I/O shutdown failure. All other
1378 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1379 * but still return zero here.
1380 *
1381 * This may only be called from process context, and also currently
1382 * assumes internal allocation of fabric payload buffer by target-core.
1383 *
1384 * It also assumes interal target core SGL memory allocation.
1385 */
1386int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1387 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1388 u32 data_length, int task_attr, int data_dir, int flags)
1389{
1390 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1391 unpacked_lun, data_length, task_attr, data_dir,
1392 flags, NULL, 0, NULL, 0);
1393}
a6360785
NB		 1394EXPORT_SYMBOL(target_submit_cmd);
1395
9f0d05c2
NB		 1396static void target_complete_tmr_failure(struct work_struct *work)
1397{
1398 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1399
1400 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1401 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
9f0d05c2
NB		 1402}
1403
ea98d7f9
AG		 1404/**
1405 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1406 * for TMR CDBs
1407 *
1408 * @se_cmd: command descriptor to submit
1409 * @se_sess: associated se_sess for endpoint
1410 * @sense: pointer to SCSI sense buffer
1411 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1412 * @fabric_context: fabric context for TMR req
1413 * @tm_type: Type of TM request
c0974f89
NB		 1414 * @gfp: gfp type for caller
1415 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1416 * @flags: submit cmd flags
ea98d7f9
AG		 1417 *
1418 * Callable from all contexts.
1419 **/
1420
c7042cae 1421int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1422 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1423 void *fabric_tmr_ptr, unsigned char tm_type,
1424 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1425{
1426 struct se_portal_group *se_tpg;
1427 int ret;
1428
1429 se_tpg = se_sess->se_tpg;
1430 BUG_ON(!se_tpg);
1431
1432 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1433 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1434 /*
1435 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1436 * allocation failure.
1437 */
c0974f89 1438 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1439 if (ret < 0)
1440 return -ENOMEM;
ea98d7f9 1441
c0974f89
NB		 1442 if (tm_type == TMR_ABORT_TASK)
1443 se_cmd->se_tmr_req->ref_task_tag = tag;
1444
ea98d7f9 1445 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1446 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1447 if (ret) {
1448 core_tmr_release_req(se_cmd->se_tmr_req);
1449 return ret;
1450 }
ea98d7f9 1451
ea98d7f9
AG		 1452 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1453 if (ret) {
9f0d05c2
NB		 1454 /*
1455 * For callback during failure handling, push this work off
1456 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1457 */
1458 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1459 schedule_work(&se_cmd->work);
c7042cae 1460 return 0;
ea98d7f9
AG		 1461 }
1462 transport_generic_handle_tmr(se_cmd);
c7042cae 1463 return 0;
ea98d7f9
AG		 1464}
1465EXPORT_SYMBOL(target_submit_tmr);
1466
cdbb70bb 1467/*
cf572a96 1468 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1469 * has completed.
1470 */
cf572a96 1471bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1472{
cdbb70bb
CH		 1473 bool was_active = false;
1474
cf572a96
CH		 1475 if (cmd->transport_state & CMD_T_BUSY) {
1476 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1477 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1478
cf572a96
CH		 1479 pr_debug("cmd %p waiting to complete\n", cmd);
1480 wait_for_completion(&cmd->task_stop_comp);
1481 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1482
1483 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1484 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1485 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1486 was_active = true;
1487 }
1488
cdbb70bb
CH		 1489 return was_active;
1490}
1491
c66ac9db
NB		 1492/*
1493 * Handle SAM-esque emulation for generic transport request failures.
1494 */
de103c93
CH		 1495void transport_generic_request_failure(struct se_cmd *cmd,
1496 sense_reason_t sense_reason)
c66ac9db 1497{
07bde79a
NB		 1498 int ret = 0;
1499
6708bb27 1500 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1501 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1502 cmd->t_task_cdb[0]);
de103c93 1503 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1504 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1505 cmd->t_state, sense_reason);
d43d6aea 1506 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1507 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1508 (cmd->transport_state & CMD_T_STOP) != 0,
1509 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1510
c66ac9db
NB		 1511 /*
1512 * For SAM Task Attribute emulation for failed struct se_cmd
1513 */
019c4ca6 1514 transport_complete_task_attr(cmd);
c66ac9db 1515
de103c93 1516 switch (sense_reason) {
03e98c9e
NB		 1517 case TCM_NON_EXISTENT_LUN:
1518 case TCM_UNSUPPORTED_SCSI_OPCODE:
1519 case TCM_INVALID_CDB_FIELD:
1520 case TCM_INVALID_PARAMETER_LIST:
1521 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1522 case TCM_UNKNOWN_MODE_PAGE:
1523 case TCM_WRITE_PROTECTED:
e2397c70 1524 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1525 case TCM_CHECK_CONDITION_ABORT_CMD:
1526 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1527 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1528 break;
de103c93
CH		 1529 case TCM_OUT_OF_RESOURCES:
1530 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1531 break;
03e98c9e 1532 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1533 /*
1534 * No SENSE Data payload for this case, set SCSI Status
1535 * and queue the response to $FABRIC_MOD.
1536 *
1537 * Uses linux/include/scsi/scsi.h SAM status codes defs
1538 */
1539 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1540 /*
1541 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1542 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1543 * CONFLICT STATUS.
1544 *
1545 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1546 */
e3d6f909 1547 if (cmd->se_sess &&
0fd97ccf 1548 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1549 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1550 cmd->orig_fe_lun, 0x2C,
1551 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1552
07bde79a 1553 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1554 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1555 goto queue_full;
c66ac9db 1556 goto check_stop;
c66ac9db 1557 default:
6708bb27 1558 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1559 cmd->t_task_cdb[0], sense_reason);
1560 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1561 break;
1562 }
f3146437 1563
de103c93 1564 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1565 if (ret == -EAGAIN || ret == -ENOMEM)
1566 goto queue_full;
07bde79a 1567
c66ac9db
NB		 1568check_stop:
1569 transport_lun_remove_cmd(cmd);
6708bb27 1570 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1571 ;
07bde79a
NB		 1572 return;
1573
1574queue_full:
e057f533
CH		 1575 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1576 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1577}
2fbff127 1578EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1579
5f41a31d 1580static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1581{
de103c93 1582 sense_reason_t ret;
5f41a31d
CH		 1583
1584 spin_lock_irq(&cmd->t_state_lock);
1585 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1586 spin_unlock_irq(&cmd->t_state_lock);
1587
de103c93
CH		 1588 if (cmd->execute_cmd) {
1589 ret = cmd->execute_cmd(cmd);
1590 if (ret) {
1591 spin_lock_irq(&cmd->t_state_lock);
1592 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1593 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1594
de103c93
CH		 1595 transport_generic_request_failure(cmd, ret);
1596 }
5f41a31d
CH		 1597 }
1598}
1599
019c4ca6 1600static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1601{
1602 struct se_device *dev = cmd->se_dev;
1603
019c4ca6
CH		 1604 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1605 return false;
5f41a31d 1606
c66ac9db 1607 /*
25985edc 1608 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1609 * to allow the passed struct se_cmd list of tasks to the front of the list.
1610 */
5f41a31d
CH		 1611 switch (cmd->sam_task_attr) {
1612 case MSG_HEAD_TAG:
1613 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1614 "se_ordered_id: %u\n",
1615 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1616 return false;
5f41a31d
CH		 1617 case MSG_ORDERED_TAG:
1618 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1619 smp_mb__after_atomic_inc();
1620
5f41a31d
CH		 1621 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1622 " se_ordered_id: %u\n",
1623 cmd->t_task_cdb[0], cmd->se_ordered_id);
1624
c66ac9db 1625 /*
5f41a31d
CH		 1626 * Execute an ORDERED command if no other older commands
1627 * exist that need to be completed first.
c66ac9db 1628 */
5f41a31d 1629 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1630 return false;
5f41a31d
CH		 1631 break;
1632 default:
c66ac9db
NB		 1633 /*
1634 * For SIMPLE and UNTAGGED Task Attribute commands
1635 */
5f41a31d 1636 atomic_inc(&dev->simple_cmds);
c66ac9db 1637 smp_mb__after_atomic_inc();
5f41a31d 1638 break;
c66ac9db 1639 }
5f41a31d 1640
019c4ca6
CH		 1641 if (atomic_read(&dev->dev_ordered_sync) == 0)
1642 return false;
c66ac9db 1643
019c4ca6
CH		 1644 spin_lock(&dev->delayed_cmd_lock);
1645 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1646 spin_unlock(&dev->delayed_cmd_lock);
1647
1648 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1649 " delayed CMD list, se_ordered_id: %u\n",
1650 cmd->t_task_cdb[0], cmd->sam_task_attr,
1651 cmd->se_ordered_id);
1652 return true;
1653}
1654
1655void target_execute_cmd(struct se_cmd *cmd)
1656{
1657 /*
1658 * If the received CDB has aleady been aborted stop processing it here.
1659 */
1660 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1661 return;
c66ac9db 1662
c66ac9db 1663 /*
019c4ca6
CH		 1664 * Determine if IOCTL context caller in requesting the stopping of this
1665 * command for LUN shutdown purposes.
c66ac9db 1666 */
019c4ca6
CH		 1667 spin_lock_irq(&cmd->t_state_lock);
1668 if (cmd->transport_state & CMD_T_LUN_STOP) {
1669 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1670 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1671
1672 cmd->transport_state &= ~CMD_T_ACTIVE;
1673 spin_unlock_irq(&cmd->t_state_lock);
1674 complete(&cmd->transport_lun_stop_comp);
1675 return;
1676 }
1677 /*
1678 * Determine if frontend context caller is requesting the stopping of
1679 * this command for frontend exceptions.
1680 */
1681 if (cmd->transport_state & CMD_T_STOP) {
1682 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1683 __func__, __LINE__,
1684 cmd->se_tfo->get_task_tag(cmd));
1685
1686 spin_unlock_irq(&cmd->t_state_lock);
1687 complete(&cmd->t_transport_stop_comp);
1688 return;
1689 }
1690
1691 cmd->t_state = TRANSPORT_PROCESSING;
1692 spin_unlock_irq(&cmd->t_state_lock);
1693
1694 if (!target_handle_task_attr(cmd))
1695 __target_execute_cmd(cmd);
c66ac9db 1696}
70baf0ab 1697EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1698
5f41a31d
CH		 1699/*
1700 * Process all commands up to the last received ORDERED task attribute which
1701 * requires another blocking boundary
1702 */
1703static void target_restart_delayed_cmds(struct se_device *dev)
1704{
1705 for (;;) {
1706 struct se_cmd *cmd;
1707
1708 spin_lock(&dev->delayed_cmd_lock);
1709 if (list_empty(&dev->delayed_cmd_list)) {
1710 spin_unlock(&dev->delayed_cmd_lock);
1711 break;
1712 }
1713
1714 cmd = list_entry(dev->delayed_cmd_list.next,
1715 struct se_cmd, se_delayed_node);
1716 list_del(&cmd->se_delayed_node);
1717 spin_unlock(&dev->delayed_cmd_lock);
1718
1719 __target_execute_cmd(cmd);
1720
1721 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1722 break;
1723 }
1724}
1725
c66ac9db 1726/*
35e0e757 1727 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1728 * and ordered cmds need to have their tasks added to the execution queue.
1729 */
1730static void transport_complete_task_attr(struct se_cmd *cmd)
1731{
5951146d 1732 struct se_device *dev = cmd->se_dev;
c66ac9db 1733
019c4ca6
CH		 1734 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1735 return;
1736
e66ecd50 1737 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1738 atomic_dec(&dev->simple_cmds);
1739 smp_mb__after_atomic_dec();
1740 dev->dev_cur_ordered_id++;
6708bb27 1741 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1742 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1743 cmd->se_ordered_id);
e66ecd50 1744 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1745 dev->dev_cur_ordered_id++;
6708bb27 1746 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1747 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1748 cmd->se_ordered_id);
e66ecd50 1749 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1750 atomic_dec(&dev->dev_ordered_sync);
1751 smp_mb__after_atomic_dec();
c66ac9db
NB		 1752
1753 dev->dev_cur_ordered_id++;
6708bb27 1754 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1755 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1756 }
c66ac9db 1757
5f41a31d 1758 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1759}
1760
e057f533 1761static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1762{
1763 int ret = 0;
1764
019c4ca6 1765 transport_complete_task_attr(cmd);
e057f533
CH		 1766
1767 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1768 ret = cmd->se_tfo->queue_status(cmd);
1769 if (ret)
1770 goto out;
1771 }
07bde79a
NB		 1772
1773 switch (cmd->data_direction) {
1774 case DMA_FROM_DEVICE:
1775 ret = cmd->se_tfo->queue_data_in(cmd);
1776 break;
1777 case DMA_TO_DEVICE:
ec98f782 1778 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 1779 ret = cmd->se_tfo->queue_data_in(cmd);
1780 if (ret < 0)
e057f533 1781 break;
07bde79a
NB		 1782 }
1783 /* Fall through for DMA_TO_DEVICE */
1784 case DMA_NONE:
1785 ret = cmd->se_tfo->queue_status(cmd);
1786 break;
1787 default:
1788 break;
1789 }
1790
e057f533
CH		 1791out:
1792 if (ret < 0) {
1793 transport_handle_queue_full(cmd, cmd->se_dev);
1794 return;
1795 }
1796 transport_lun_remove_cmd(cmd);
1797 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1798}
1799
1800static void transport_handle_queue_full(
1801 struct se_cmd *cmd,
e057f533 1802 struct se_device *dev)
07bde79a
NB		 1803{
1804 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1805 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1806 atomic_inc(&dev->dev_qf_count);
1807 smp_mb__after_atomic_inc();
1808 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1809
1810 schedule_work(&cmd->se_dev->qf_work_queue);
1811}
1812
35e0e757 1813static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1814{
35e0e757 1815 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1816 int ret;
35e0e757 1817
c66ac9db
NB		 1818 /*
1819 * Check if we need to move delayed/dormant tasks from cmds on the
1820 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1821 * Attribute.
1822 */
019c4ca6
CH		 1823 transport_complete_task_attr(cmd);
1824
07bde79a
NB		 1825 /*
1826 * Check to schedule QUEUE_FULL work, or execute an existing
1827 * cmd->transport_qf_callback()
1828 */
1829 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1830 schedule_work(&cmd->se_dev->qf_work_queue);
1831
c66ac9db 1832 /*
d5829eac 1833 * Check if we need to send a sense buffer from
c66ac9db
NB		 1834 * the struct se_cmd in question.
1835 */
1836 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1837 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1838 ret = transport_send_check_condition_and_sense(
1839 cmd, 0, 1);
1840 if (ret == -EAGAIN || ret == -ENOMEM)
1841 goto queue_full;
1842
1843 transport_lun_remove_cmd(cmd);
1844 transport_cmd_check_stop_to_fabric(cmd);
1845 return;
c66ac9db
NB		 1846 }
1847 /*
25985edc 1848 * Check for a callback, used by amongst other things
c66ac9db
NB		 1849 * XDWRITE_READ_10 emulation.
1850 */
1851 if (cmd->transport_complete_callback)
1852 cmd->transport_complete_callback(cmd);
1853
1854 switch (cmd->data_direction) {
1855 case DMA_FROM_DEVICE:
1856 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1857 if (cmd->se_lun->lun_sep) {
1858 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1859 cmd->data_length;
1860 }
1861 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1862
07bde79a 1863 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1864 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1865 goto queue_full;
c66ac9db
NB		 1866 break;
1867 case DMA_TO_DEVICE:
1868 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1869 if (cmd->se_lun->lun_sep) {
1870 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1871 cmd->data_length;
1872 }
1873 spin_unlock(&cmd->se_lun->lun_sep_lock);
1874 /*
1875 * Check if we need to send READ payload for BIDI-COMMAND
1876 */
ec98f782 1877 if (cmd->t_bidi_data_sg) {
c66ac9db 1878 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1879 if (cmd->se_lun->lun_sep) {
1880 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1881 cmd->data_length;
1882 }
1883 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1884 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1885 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1886 goto queue_full;
c66ac9db
NB		 1887 break;
1888 }
1889 /* Fall through for DMA_TO_DEVICE */
1890 case DMA_NONE:
07bde79a 1891 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1892 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1893 goto queue_full;
c66ac9db
NB		 1894 break;
1895 default:
1896 break;
1897 }
1898
1899 transport_lun_remove_cmd(cmd);
1900 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1901 return;
1902
1903queue_full:
6708bb27 1904 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1905 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1906 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1907 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1908}
1909
6708bb27 1910static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 1911{
ec98f782 1912 struct scatterlist *sg;
ec98f782 1913 int count;
c66ac9db 1914
6708bb27
AG		 1915 for_each_sg(sgl, sg, nents, count)
1916 __free_page(sg_page(sg));
c66ac9db 1917
6708bb27
AG		 1918 kfree(sgl);
1919}
c66ac9db 1920
6708bb27
AG		 1921static inline void transport_free_pages(struct se_cmd *cmd)
1922{
1923 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
1924 return;
1925
1926 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 1927 cmd->t_data_sg = NULL;
1928 cmd->t_data_nents = 0;
c66ac9db 1929
6708bb27 1930 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 1931 cmd->t_bidi_data_sg = NULL;
1932 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 1933}
1934
e26d99ae
CH		 1935/**
1936 * transport_release_cmd - free a command
1937 * @cmd: command to free
1938 *
1939 * This routine unconditionally frees a command, and reference counting
1940 * or list removal must be done in the caller.
1941 */
1942static void transport_release_cmd(struct se_cmd *cmd)
1943{
1944 BUG_ON(!cmd->se_tfo);
1945
c8e31f26 1946 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 1947 core_tmr_release_req(cmd->se_tmr_req);
1948 if (cmd->t_task_cdb != cmd->__t_task_cdb)
1949 kfree(cmd->t_task_cdb);
1950 /*
7481deb4
NB		 1951 * If this cmd has been setup with target_get_sess_cmd(), drop
1952 * the kref and call ->release_cmd() in kref callback.
e26d99ae 1953 */
7481deb4
NB		 1954 if (cmd->check_release != 0) {
1955 target_put_sess_cmd(cmd->se_sess, cmd);
1956 return;
1957 }
e26d99ae
CH		 1958 cmd->se_tfo->release_cmd(cmd);
1959}
1960
d3df7825
CH		 1961/**
1962 * transport_put_cmd - release a reference to a command
1963 * @cmd: command to release
1964 *
1965 * This routine releases our reference to the command and frees it if possible.
1966 */
39c05f32 1967static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 1968{
1969 unsigned long flags;
c66ac9db 1970
a1d8b49a 1971 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 1972 if (atomic_read(&cmd->t_fe_count)) {
1973 if (!atomic_dec_and_test(&cmd->t_fe_count))
1974 goto out_busy;
1975 }
1976
7d680f3b
CH		 1977 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
1978 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 1979 target_remove_from_state_list(cmd);
c66ac9db 1980 }
a1d8b49a 1981 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 1982
c66ac9db 1983 transport_free_pages(cmd);
31afc39c 1984 transport_release_cmd(cmd);
39c05f32 1985 return;
4911e3cc
CH		 1986out_busy:
1987 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1988}
1989
4949314c 1990void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 1991{
ec98f782 1992 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 1993 struct page **pages;
1994 int i;
05d1c7c0
AG		 1995
1996 /*
ec98f782
AG		 1997 * We need to take into account a possible offset here for fabrics like
1998 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
1999 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2000 */
4949314c
AG		 2001 if (!cmd->t_data_nents)
2002 return NULL;
3717ef0c
PB		 2003
2004 BUG_ON(!sg);
2005 if (cmd->t_data_nents == 1)
4949314c
AG		 2006 return kmap(sg_page(sg)) + sg->offset;
2007
2008 /* >1 page. use vmap */
2009 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2010 if (!pages)
4949314c
AG		 2011 return NULL;
2012
2013 /* convert sg[] to pages[] */
2014 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2015 pages[i] = sg_page(sg);
2016 }
2017
2018 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2019 kfree(pages);
de103c93 2020 if (!cmd->t_data_vmap)
4949314c
AG		 2021 return NULL;
2022
2023 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2024}
4949314c 2025EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2026
4949314c 2027void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2028{
a1edf9cf 2029 if (!cmd->t_data_nents) {
4949314c 2030 return;
a1edf9cf 2031 } else if (cmd->t_data_nents == 1) {
4949314c 2032 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2033 return;
2034 }
4949314c
AG		 2035
2036 vunmap(cmd->t_data_vmap);
2037 cmd->t_data_vmap = NULL;
05d1c7c0 2038}
4949314c 2039EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2040
c66ac9db 2041static int
05d1c7c0 2042transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2043{
ec98f782
AG		 2044 u32 length = cmd->data_length;
2045 unsigned int nents;
2046 struct page *page;
9db9da33 2047 gfp_t zero_flag;
ec98f782 2048 int i = 0;
c66ac9db 2049
ec98f782
AG		 2050 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2051 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2052 if (!cmd->t_data_sg)
2053 return -ENOMEM;
c66ac9db 2054
ec98f782
AG		 2055 cmd->t_data_nents = nents;
2056 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2057
64f1db38 2058 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2059
ec98f782
AG		 2060 while (length) {
2061 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2062 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2063 if (!page)
2064 goto out;
c66ac9db 2065
ec98f782
AG		 2066 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2067 length -= page_len;
2068 i++;
c66ac9db 2069 }
c66ac9db 2070 return 0;
c66ac9db 2071
ec98f782 2072out:
d0e27c88 2073 while (i > 0) {
ec98f782 2074 i--;
d0e27c88 2075 __free_page(sg_page(&cmd->t_data_sg[i]));
c66ac9db 2076 }
ec98f782
AG		 2077 kfree(cmd->t_data_sg);
2078 cmd->t_data_sg = NULL;
2079 return -ENOMEM;
c66ac9db
NB		 2080}
2081
da0f7619 2082/*
b16a35b0
AG		 2083 * Allocate any required resources to execute the command. For writes we
2084 * might not have the payload yet, so notify the fabric via a call to
2085 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2086 */
de103c93
CH		 2087sense_reason_t
2088transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2089{
c66ac9db
NB		 2090 int ret = 0;
2091
2092 /*
2093 * Determine is the TCM fabric module has already allocated physical
2094 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2095 * beforehand.
c66ac9db 2096 */
ec98f782
AG		 2097 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2098 cmd->data_length) {
05d1c7c0 2099 ret = transport_generic_get_mem(cmd);
c66ac9db 2100 if (ret < 0)
de103c93 2101 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2102 }
da0f7619 2103
4101f0a8 2104 atomic_inc(&cmd->t_fe_count);
4101f0a8 2105
c66ac9db 2106 /*
c3196f0c
CH		 2107 * If this command is not a write we can execute it right here,
2108 * for write buffers we need to notify the fabric driver first
2109 * and let it call back once the write buffers are ready.
c66ac9db 2110 */
5f41a31d 2111 target_add_to_state_list(cmd);
c3196f0c
CH		 2112 if (cmd->data_direction != DMA_TO_DEVICE) {
2113 target_execute_cmd(cmd);
2114 return 0;
2115 }
2116
2117 spin_lock_irq(&cmd->t_state_lock);
2118 cmd->t_state = TRANSPORT_WRITE_PENDING;
2119 spin_unlock_irq(&cmd->t_state_lock);
2120
2121 transport_cmd_check_stop(cmd, false);
2122
2123 ret = cmd->se_tfo->write_pending(cmd);
2124 if (ret == -EAGAIN || ret == -ENOMEM)
2125 goto queue_full;
2126
de103c93
CH		 2127 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2128 WARN_ON(ret);
2129
b69c1fcf 2130 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2131
c3196f0c
CH		 2132queue_full:
2133 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2134 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2135 transport_handle_queue_full(cmd, cmd->se_dev);
2136 return 0;
c66ac9db 2137}
a1d8b49a 2138EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2139
e057f533 2140static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2141{
f147abb4
NB		 2142 int ret;
2143
2144 ret = cmd->se_tfo->write_pending(cmd);
2145 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2146 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2147 cmd);
2148 transport_handle_queue_full(cmd, cmd->se_dev);
2149 }
07bde79a
NB		 2150}
2151
39c05f32 2152void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2153{
d14921d6 2154 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2155 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2156 transport_wait_for_tasks(cmd);
2157
35462975 2158 transport_release_cmd(cmd);
d14921d6
NB		 2159 } else {
2160 if (wait_for_tasks)
2161 transport_wait_for_tasks(cmd);
2162
c66ac9db
NB		 2163 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2164
82f1c8a4 2165 if (cmd->se_lun)
c66ac9db 2166 transport_lun_remove_cmd(cmd);
c66ac9db 2167
39c05f32 2168 transport_put_cmd(cmd);
c66ac9db
NB		 2169 }
2170}
2171EXPORT_SYMBOL(transport_generic_free_cmd);
2172
a17f091d
NB		 2173/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2174 * @se_sess: session to reference
2175 * @se_cmd: command descriptor to add
a6360785 2176 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2177 */
bc187ea6
RD		 2178static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2179 bool ack_kref)
a17f091d
NB		 2180{
2181 unsigned long flags;
bc187ea6 2182 int ret = 0;
a17f091d 2183
7481deb4 2184 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2185 /*
2186 * Add a second kref if the fabric caller is expecting to handle
2187 * fabric acknowledgement that requires two target_put_sess_cmd()
2188 * invocations before se_cmd descriptor release.
2189 */
86715569 2190 if (ack_kref == true) {
a6360785 2191 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2192 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2193 }
7481deb4 2194
a17f091d 2195 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2196 if (se_sess->sess_tearing_down) {
2197 ret = -ESHUTDOWN;
2198 goto out;
2199 }
a17f091d
NB		 2200 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2201 se_cmd->check_release = 1;
bc187ea6
RD		 2202
2203out:
a17f091d 2204 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2205 return ret;
a17f091d 2206}
a17f091d 2207
7481deb4 2208static void target_release_cmd_kref(struct kref *kref)
a17f091d 2209{
7481deb4
NB		 2210 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2211 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 2212 unsigned long flags;
2213
2214 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2215 if (list_empty(&se_cmd->se_cmd_list)) {
2216 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2217 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2218 return;
a17f091d 2219 }
a17f091d
NB		 2220 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2221 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2222 complete(&se_cmd->cmd_wait_comp);
7481deb4 2223 return;
a17f091d
NB		 2224 }
2225 list_del(&se_cmd->se_cmd_list);
2226 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2227
7481deb4
NB		 2228 se_cmd->se_tfo->release_cmd(se_cmd);
2229}
2230
2231/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2232 * @se_sess: session to reference
2233 * @se_cmd: command descriptor to drop
2234 */
2235int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2236{
2237 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2238}
2239EXPORT_SYMBOL(target_put_sess_cmd);
2240
1c7b13fe
RD		 2241/* target_sess_cmd_list_set_waiting - Flag all commands in
2242 * sess_cmd_list to complete cmd_wait_comp. Set
2243 * sess_tearing_down so no more commands are queued.
2244 * @se_sess: session to flag
a17f091d 2245 */
1c7b13fe 2246void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2247{
2248 struct se_cmd *se_cmd;
2249 unsigned long flags;
2250
a17f091d 2251 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
a17f091d 2252
1c7b13fe
RD		 2253 WARN_ON(se_sess->sess_tearing_down);
2254 se_sess->sess_tearing_down = 1;
a17f091d 2255
1c7b13fe 2256 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
a17f091d
NB		 2257 se_cmd->cmd_wait_set = 1;
2258
2259 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2260}
1c7b13fe 2261EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2262
2263/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2264 * @se_sess: session to wait for active I/O
2265 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2266 */
2267void target_wait_for_sess_cmds(
2268 struct se_session *se_sess,
2269 int wait_for_tasks)
2270{
2271 struct se_cmd *se_cmd, *tmp_cmd;
2272 bool rc = false;
2273
2274 list_for_each_entry_safe(se_cmd, tmp_cmd,
1c7b13fe 2275 &se_sess->sess_cmd_list, se_cmd_list) {
a17f091d
NB		 2276 list_del(&se_cmd->se_cmd_list);
2277
2278 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2279 " %d\n", se_cmd, se_cmd->t_state,
2280 se_cmd->se_tfo->get_cmd_state(se_cmd));
2281
2282 if (wait_for_tasks) {
2283 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2284 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2285 se_cmd->se_tfo->get_cmd_state(se_cmd));
2286
2287 rc = transport_wait_for_tasks(se_cmd);
2288
2289 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2290 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2291 se_cmd->se_tfo->get_cmd_state(se_cmd));
2292 }
2293
2294 if (!rc) {
2295 wait_for_completion(&se_cmd->cmd_wait_comp);
2296 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2297 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2298 se_cmd->se_tfo->get_cmd_state(se_cmd));
2299 }
2300
2301 se_cmd->se_tfo->release_cmd(se_cmd);
2302 }
2303}
2304EXPORT_SYMBOL(target_wait_for_sess_cmds);
2305
c66ac9db
NB		 2306/* transport_lun_wait_for_tasks():
2307 *
2308 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2309 * an struct se_lun to be successfully shutdown.
2310 */
2311static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2312{
2313 unsigned long flags;
cf572a96
CH		 2314 int ret = 0;
2315
c66ac9db
NB		 2316 /*
2317 * If the frontend has already requested this struct se_cmd to
2318 * be stopped, we can safely ignore this struct se_cmd.
2319 */
a1d8b49a 2320 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2321 if (cmd->transport_state & CMD_T_STOP) {
2322 cmd->transport_state &= ~CMD_T_LUN_STOP;
2323
2324 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2325 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2326 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2327 transport_cmd_check_stop(cmd, false);
e3d6f909 2328 return -EPERM;
c66ac9db 2329 }
7d680f3b 2330 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2331 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2332
cf572a96
CH		 2333 // XXX: audit task_flags checks.
2334 spin_lock_irqsave(&cmd->t_state_lock, flags);
2335 if ((cmd->transport_state & CMD_T_BUSY) &&
2336 (cmd->transport_state & CMD_T_SENT)) {
2337 if (!target_stop_cmd(cmd, &flags))
2338 ret++;
cf572a96 2339 }
5f41a31d 2340 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2341
785fdf70
CH		 2342 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2343 " %d\n", cmd, ret);
c66ac9db 2344 if (!ret) {
6708bb27 2345 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2346 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2347 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2348 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2349 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2350 }
c66ac9db
NB		 2351
2352 return 0;
2353}
2354
c66ac9db
NB		 2355static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2356{
2357 struct se_cmd *cmd = NULL;
2358 unsigned long lun_flags, cmd_flags;
2359 /*
2360 * Do exception processing and return CHECK_CONDITION status to the
2361 * Initiator Port.
2362 */
2363 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2364 while (!list_empty(&lun->lun_cmd_list)) {
2365 cmd = list_first_entry(&lun->lun_cmd_list,
2366 struct se_cmd, se_lun_node);
3d26fea0 2367 list_del_init(&cmd->se_lun_node);
5951146d 2368
a1d8b49a 2369 spin_lock(&cmd->t_state_lock);
6708bb27 2370 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2371 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2372 cmd->se_lun->unpacked_lun,
2373 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2374 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2375 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2376
2377 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2378
6708bb27
AG		 2379 if (!cmd->se_lun) {
2380 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2381 cmd->se_tfo->get_task_tag(cmd),
2382 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2383 BUG();
2384 }
2385 /*
2386 * If the Storage engine still owns the iscsi_cmd_t, determine
2387 * and/or stop its context.
2388 */
6708bb27 2389 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2390 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2391 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2392
e3d6f909 2393 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2394 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2395 continue;
2396 }
2397
6708bb27 2398 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2399 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2400 cmd->se_lun->unpacked_lun,
2401 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2402
a1d8b49a 2403 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2404 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2405 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2406 goto check_cond;
2407 }
7d680f3b 2408 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2409 target_remove_from_state_list(cmd);
a1d8b49a 2410 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2411
c66ac9db
NB		 2412 /*
2413 * The Storage engine stopped this struct se_cmd before it was
2414 * send to the fabric frontend for delivery back to the
2415 * Initiator Node. Return this SCSI CDB back with an
2416 * CHECK_CONDITION status.
2417 */
2418check_cond:
2419 transport_send_check_condition_and_sense(cmd,
2420 TCM_NON_EXISTENT_LUN, 0);
2421 /*
2422 * If the fabric frontend is waiting for this iscsi_cmd_t to
2423 * be released, notify the waiting thread now that LU has
2424 * finished accessing it.
2425 */
a1d8b49a 2426 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2427 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2428 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2429 " struct se_cmd: %p ITT: 0x%08x\n",
2430 lun->unpacked_lun,
e3d6f909 2431 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2432
a1d8b49a 2433 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2434 cmd_flags);
f7113a47 2435 transport_cmd_check_stop(cmd, false);
a1d8b49a 2436 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2437 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2438 continue;
2439 }
6708bb27 2440 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2441 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2442
a1d8b49a 2443 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2444 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2445 }
2446 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2447}
2448
2449static int transport_clear_lun_thread(void *p)
2450{
8359cf43 2451 struct se_lun *lun = p;
c66ac9db
NB		 2452
2453 __transport_clear_lun_from_sessions(lun);
2454 complete(&lun->lun_shutdown_comp);
2455
2456 return 0;
2457}
2458
2459int transport_clear_lun_from_sessions(struct se_lun *lun)
2460{
2461 struct task_struct *kt;
2462
5951146d 2463 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2464 "tcm_cl_%u", lun->unpacked_lun);
2465 if (IS_ERR(kt)) {
6708bb27 2466 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2467 return PTR_ERR(kt);
c66ac9db
NB		 2468 }
2469 wait_for_completion(&lun->lun_shutdown_comp);
2470
2471 return 0;
2472}
2473
d14921d6
NB		 2474/**
2475 * transport_wait_for_tasks - wait for completion to occur
2476 * @cmd: command to wait
c66ac9db 2477 *
d14921d6
NB		 2478 * Called from frontend fabric context to wait for storage engine
2479 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2480 */
a17f091d 2481bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2482{
2483 unsigned long flags;
2484
a1d8b49a 2485 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2486 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2487 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2488 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2489 return false;
d14921d6 2490 }
cb4f4d3c 2491
c8e31f26
AG		 2492 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2493 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2494 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2495 return false;
d14921d6 2496 }
c66ac9db
NB		 2497 /*
2498 * If we are already stopped due to an external event (ie: LUN shutdown)
2499 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2500 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2501 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2502 * has completed its operation on the struct se_cmd.
2503 */
7d680f3b 2504 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2505 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2506 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2507 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2508 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2509 /*
2510 * There is a special case for WRITES where a FE exception +
2511 * LUN shutdown means ConfigFS context is still sleeping on
2512 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2513 * We go ahead and up transport_lun_stop_comp just to be sure
2514 * here.
2515 */
a1d8b49a
AG		 2516 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2517 complete(&cmd->transport_lun_stop_comp);
2518 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2519 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2520
cf572a96 2521 target_remove_from_state_list(cmd);
c66ac9db
NB		 2522 /*
2523 * At this point, the frontend who was the originator of this
2524 * struct se_cmd, now owns the structure and can be released through
2525 * normal means below.
2526 */
6708bb27 2527 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2528 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2529 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2530 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2531
7d680f3b 2532 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2533 }
7d680f3b 2534
3d28934a 2535 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2536 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2537 return false;
d14921d6 2538 }
c66ac9db 2539
7d680f3b 2540 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2541
6708bb27 2542 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2543 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2544 cmd, cmd->se_tfo->get_task_tag(cmd),
2545 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2546
a1d8b49a 2547 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2548
a1d8b49a 2549 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2550
a1d8b49a 2551 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2552 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2553
35d1efe8 2554 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2555 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2556 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2557
d14921d6 2558 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2559
2560 return true;
c66ac9db 2561}
d14921d6 2562EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2563
2564static int transport_get_sense_codes(
2565 struct se_cmd *cmd,
2566 u8 *asc,
2567 u8 *ascq)
2568{
2569 *asc = cmd->scsi_asc;
2570 *ascq = cmd->scsi_ascq;
2571
2572 return 0;
2573}
2574
de103c93
CH		 2575int
2576transport_send_check_condition_and_sense(struct se_cmd *cmd,
2577 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2578{
2579 unsigned char *buffer = cmd->sense_buffer;
2580 unsigned long flags;
c66ac9db
NB		 2581 u8 asc = 0, ascq = 0;
2582
a1d8b49a 2583 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2584 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2585 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2586 return 0;
2587 }
2588 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2589 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2590
2591 if (!reason && from_transport)
2592 goto after_reason;
2593
2594 if (!from_transport)
2595 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2596
c66ac9db
NB		 2597 /*
2598 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2599 * SENSE KEY values from include/scsi/scsi.h
2600 */
2601 switch (reason) {
2602 case TCM_NON_EXISTENT_LUN:
eb39d340 2603 /* CURRENT ERROR */
9c58b7dd
RD		 2604 buffer[0] = 0x70;
2605 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2606 /* ILLEGAL REQUEST */
9c58b7dd 2607 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2608 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2609 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2610 break;
c66ac9db
NB		 2611 case TCM_UNSUPPORTED_SCSI_OPCODE:
2612 case TCM_SECTOR_COUNT_TOO_MANY:
2613 /* CURRENT ERROR */
9c58b7dd
RD		 2614 buffer[0] = 0x70;
2615 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2616 /* ILLEGAL REQUEST */
9c58b7dd 2617 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2618 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2619 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2620 break;
2621 case TCM_UNKNOWN_MODE_PAGE:
2622 /* CURRENT ERROR */
9c58b7dd
RD		 2623 buffer[0] = 0x70;
2624 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2625 /* ILLEGAL REQUEST */
9c58b7dd 2626 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2627 /* INVALID FIELD IN CDB */
9c58b7dd 2628 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2629 break;
2630 case TCM_CHECK_CONDITION_ABORT_CMD:
2631 /* CURRENT ERROR */
9c58b7dd
RD		 2632 buffer[0] = 0x70;
2633 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2634 /* ABORTED COMMAND */
9c58b7dd 2635 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2636 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2637 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2638 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2639 break;
2640 case TCM_INCORRECT_AMOUNT_OF_DATA:
2641 /* CURRENT ERROR */
9c58b7dd
RD		 2642 buffer[0] = 0x70;
2643 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2644 /* ABORTED COMMAND */
9c58b7dd 2645 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2646 /* WRITE ERROR */
9c58b7dd 2647 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2648 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2649 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2650 break;
2651 case TCM_INVALID_CDB_FIELD:
2652 /* CURRENT ERROR */
9c58b7dd
RD		 2653 buffer[0] = 0x70;
2654 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2655 /* ILLEGAL REQUEST */
9c58b7dd 2656 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2657 /* INVALID FIELD IN CDB */
9c58b7dd 2658 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2659 break;
2660 case TCM_INVALID_PARAMETER_LIST:
2661 /* CURRENT ERROR */
9c58b7dd
RD		 2662 buffer[0] = 0x70;
2663 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2664 /* ILLEGAL REQUEST */
9c58b7dd 2665 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2666 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2667 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db
NB		 2668 break;
2669 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2670 /* CURRENT ERROR */
9c58b7dd
RD		 2671 buffer[0] = 0x70;
2672 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2673 /* ABORTED COMMAND */
9c58b7dd 2674 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2675 /* WRITE ERROR */
9c58b7dd 2676 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2677 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2678 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2679 break;
2680 case TCM_SERVICE_CRC_ERROR:
2681 /* CURRENT ERROR */
9c58b7dd
RD		 2682 buffer[0] = 0x70;
2683 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2684 /* ABORTED COMMAND */
9c58b7dd 2685 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2686 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2687 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2688 /* N/A */
9c58b7dd 2689 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2690 break;
2691 case TCM_SNACK_REJECTED:
2692 /* CURRENT ERROR */
9c58b7dd
RD		 2693 buffer[0] = 0x70;
2694 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2695 /* ABORTED COMMAND */
9c58b7dd 2696 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2697 /* READ ERROR */
9c58b7dd 2698 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2699 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2700 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2701 break;
2702 case TCM_WRITE_PROTECTED:
2703 /* CURRENT ERROR */
9c58b7dd
RD		 2704 buffer[0] = 0x70;
2705 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2706 /* DATA PROTECT */
9c58b7dd 2707 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2708 /* WRITE PROTECTED */
9c58b7dd 2709 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2710 break;
e2397c70
RD		 2711 case TCM_ADDRESS_OUT_OF_RANGE:
2712 /* CURRENT ERROR */
9c58b7dd
RD		 2713 buffer[0] = 0x70;
2714 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2715 /* ILLEGAL REQUEST */
9c58b7dd 2716 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2717 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2718 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2719 break;
c66ac9db
NB		 2720 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2721 /* CURRENT ERROR */
9c58b7dd
RD		 2722 buffer[0] = 0x70;
2723 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2724 /* UNIT ATTENTION */
9c58b7dd 2725 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2726 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2727 buffer[SPC_ASC_KEY_OFFSET] = asc;
2728 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2729 break;
2730 case TCM_CHECK_CONDITION_NOT_READY:
2731 /* CURRENT ERROR */
9c58b7dd
RD		 2732 buffer[0] = 0x70;
2733 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2734 /* Not Ready */
9c58b7dd 2735 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2736 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2737 buffer[SPC_ASC_KEY_OFFSET] = asc;
2738 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2739 break;
2740 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2741 default:
2742 /* CURRENT ERROR */
9c58b7dd
RD		 2743 buffer[0] = 0x70;
2744 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2745 /* ILLEGAL REQUEST */
9c58b7dd 2746 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2747 /* LOGICAL UNIT COMMUNICATION FAILURE */
9c58b7dd 2748 buffer[SPC_ASC_KEY_OFFSET] = 0x80;
c66ac9db
NB		 2749 break;
2750 }
2751 /*
2752 * This code uses linux/include/scsi/scsi.h SAM status codes!
2753 */
2754 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2755 /*
2756 * Automatically padded, this value is encoded in the fabric's
2757 * data_length response PDU containing the SCSI defined sense data.
2758 */
9c58b7dd 2759 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2760
2761after_reason:
07bde79a 2762 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2763}
2764EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2765
2766int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2767{
2768 int ret = 0;
2769
7d680f3b 2770 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 2771 if (!send_status ||
c66ac9db
NB		 2772 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2773 return 1;
8b1e1244 2774
6708bb27 2775 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 2776 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 2777 cmd->t_task_cdb[0],
e3d6f909 2778 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2779
c66ac9db 2780 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 2781 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2782 ret = 1;
2783 }
2784 return ret;
2785}
2786EXPORT_SYMBOL(transport_check_aborted_status);
2787
2788void transport_send_task_abort(struct se_cmd *cmd)
2789{
c252f003
NB		 2790 unsigned long flags;
2791
2792 spin_lock_irqsave(&cmd->t_state_lock, flags);
2793 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2794 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2795 return;
2796 }
2797 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2798
c66ac9db
NB		 2799 /*
2800 * If there are still expected incoming fabric WRITEs, we wait
2801 * until until they have completed before sending a TASK_ABORTED
2802 * response. This response with TASK_ABORTED status will be
2803 * queued back to fabric module by transport_check_aborted_status().
2804 */
2805 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2806 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2807 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2808 smp_mb__after_atomic_inc();
c66ac9db
NB		 2809 }
2810 }
2811 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2812
6708bb27 2813 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2814 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2815 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2816
e3d6f909 2817 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2818}
2819
af877292 2820static void target_tmr_work(struct work_struct *work)
c66ac9db 2821{
af877292 2822 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2823 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2824 struct se_tmr_req *tmr = cmd->se_tmr_req;
2825 int ret;
2826
2827 switch (tmr->function) {
5c6cd613 2828 case TMR_ABORT_TASK:
3d28934a 2829 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2830 break;
5c6cd613
NB		 2831 case TMR_ABORT_TASK_SET:
2832 case TMR_CLEAR_ACA:
2833 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2834 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2835 break;
5c6cd613 2836 case TMR_LUN_RESET:
c66ac9db
NB		 2837 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2838 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2839 TMR_FUNCTION_REJECTED;
2840 break;
5c6cd613 2841 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2842 tmr->response = TMR_FUNCTION_REJECTED;
2843 break;
5c6cd613 2844 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2845 tmr->response = TMR_FUNCTION_REJECTED;
2846 break;
c66ac9db 2847 default:
6708bb27 2848 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2849 tmr->function);
2850 tmr->response = TMR_FUNCTION_REJECTED;
2851 break;
2852 }
2853
2854 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2855 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2856
b7b8bef7 2857 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2858}
2859
af877292
CH		 2860int transport_generic_handle_tmr(
2861 struct se_cmd *cmd)
c66ac9db 2862{
af877292
CH		 2863 INIT_WORK(&cmd->work, target_tmr_work);
2864 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2865 return 0;
2866}
af877292 2867EXPORT_SYMBOL(transport_generic_handle_tmr);