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target: Fix incorrect starting offset after MODE_SENSE refactoring
[mirror_ubuntu-bionic-kernel.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
015487b8 40#include <linux/ratelimit.h>
c66ac9db
NB		 41#include <asm/unaligned.h>
42#include <net/sock.h>
43#include <net/tcp.h>
44#include <scsi/scsi.h>
45#include <scsi/scsi_cmnd.h>
e66ecd50 46#include <scsi/scsi_tcq.h>
c66ac9db
NB		 47
48#include <target/target_core_base.h>
c4795fb2
CH		 49#include <target/target_core_backend.h>
50#include <target/target_core_fabric.h>
c66ac9db
NB		 51#include <target/target_core_configfs.h>
52
e26d99ae 53#include "target_core_internal.h"
c66ac9db 54#include "target_core_alua.h"
c66ac9db 55#include "target_core_pr.h"
c66ac9db
NB		 56#include "target_core_ua.h"
57
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
03e98c9e 560 transport_generic_request_failure(cmd);
35e0e757
CH		 561}
562
6138ed2a 563/*
d5829eac
PB		 564 * Used when asking transport to copy Sense Data from the underlying
565 * Linux/SCSI struct scsi_cmnd
6138ed2a 566 */
d5829eac 567static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 568{
6138ed2a 569 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 570
571 WARN_ON(!cmd->se_lun);
572
573 if (!dev)
d5829eac 574 return NULL;
6138ed2a 575
d5829eac
PB		 576 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
577 return NULL;
6138ed2a 578
9c58b7dd 579 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 580
d5829eac 581 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 582 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 583 return cmd->sense_buffer;
6138ed2a
PB		 584}
585
5787cacd 586void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 587{
42bf829e 588 struct se_device *dev = cmd->se_dev;
5787cacd 589 int success = scsi_status == GOOD;
c66ac9db 590 unsigned long flags;
c66ac9db 591
5787cacd
CH		 592 cmd->scsi_status = scsi_status;
593
594
a1d8b49a 595 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 596 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 597
c66ac9db 598 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 599 dev->transport->transport_complete(cmd,
600 cmd->t_data_sg,
601 transport_get_sense_buffer(cmd));
602 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 603 success = 1;
c66ac9db
NB		 604 }
605
606 /*
5787cacd 607 * See if we are waiting to complete for an exception condition.
c66ac9db 608 */
cf572a96 609 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 610 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 611 complete(&cmd->task_stop_comp);
c66ac9db
NB		 612 return;
613 }
2235007c
CH		 614
615 if (!success)
7d680f3b 616 cmd->transport_state |= CMD_T_FAILED;
2235007c 617
3d28934a
NB		 618 /*
619 * Check for case where an explict ABORT_TASK has been received
620 * and transport_wait_for_tasks() will be waiting for completion..
621 */
622 if (cmd->transport_state & CMD_T_ABORTED &&
623 cmd->transport_state & CMD_T_STOP) {
624 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
625 complete(&cmd->t_transport_stop_comp);
626 return;
627 } else if (cmd->transport_state & CMD_T_FAILED) {
41e16e98 628 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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
1fd032ee 979int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 980{
981 struct se_device *dev = cmd->se_dev;
982
983 if (cmd->unknown_data_length) {
984 cmd->data_length = size;
985 } else if (size != cmd->data_length) {
986 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
987 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
988 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
989 cmd->data_length, size, cmd->t_task_cdb[0]);
990
9b3b8041
CH		 991 if (cmd->data_direction == DMA_TO_DEVICE) {
992 pr_err("Rejecting underflow/overflow"
993 " WRITE data\n");
994 goto out_invalid_cdb_field;
995 }
996 /*
997 * Reject READ_* or WRITE_* with overflow/underflow for
998 * type SCF_SCSI_DATA_CDB.
999 */
0fd97ccf 1000 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1001 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1002 " CDB on non 512-byte sector setup subsystem"
1003 " plugin: %s\n", dev->transport->name);
1004 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1005 goto out_invalid_cdb_field;
1006 }
4c054ba6
NB		 1007 /*
1008 * For the overflow case keep the existing fabric provided
1009 * ->data_length. Otherwise for the underflow case, reset
1010 * ->data_length to the smaller SCSI expected data transfer
1011 * length.
1012 */
9b3b8041
CH		 1013 if (size > cmd->data_length) {
1014 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1015 cmd->residual_count = (size - cmd->data_length);
1016 } else {
1017 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1018 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1019 cmd->data_length = size;
9b3b8041 1020 }
9b3b8041
CH		 1021 }
1022
1023 return 0;
1024
1025out_invalid_cdb_field:
1026 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1027 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1028 return -EINVAL;
1029}
1030
c66ac9db
NB		 1031/*
1032 * Used by fabric modules containing a local struct se_cmd within their
1033 * fabric dependent per I/O descriptor.
1034 */
1035void transport_init_se_cmd(
1036 struct se_cmd *cmd,
1037 struct target_core_fabric_ops *tfo,
1038 struct se_session *se_sess,
1039 u32 data_length,
1040 int data_direction,
1041 int task_attr,
1042 unsigned char *sense_buffer)
1043{
5951146d
AG		 1044 INIT_LIST_HEAD(&cmd->se_lun_node);
1045 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1046 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1047 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1048 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1049 init_completion(&cmd->transport_lun_fe_stop_comp);
1050 init_completion(&cmd->transport_lun_stop_comp);
1051 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1052 init_completion(&cmd->cmd_wait_comp);
cf572a96 1053 init_completion(&cmd->task_stop_comp);
a1d8b49a 1054 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1055 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1056
1057 cmd->se_tfo = tfo;
1058 cmd->se_sess = se_sess;
1059 cmd->data_length = data_length;
1060 cmd->data_direction = data_direction;
1061 cmd->sam_task_attr = task_attr;
1062 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1063
1064 cmd->state_active = false;
c66ac9db
NB		 1065}
1066EXPORT_SYMBOL(transport_init_se_cmd);
1067
1068static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1069{
019c4ca6
CH		 1070 struct se_device *dev = cmd->se_dev;
1071
c66ac9db
NB		 1072 /*
1073 * Check if SAM Task Attribute emulation is enabled for this
1074 * struct se_device storage object
1075 */
019c4ca6 1076 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1077 return 0;
1078
e66ecd50 1079 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1080 pr_debug("SAM Task Attribute ACA"
c66ac9db 1081 " emulation is not supported\n");
e3d6f909 1082 return -EINVAL;
c66ac9db
NB		 1083 }
1084 /*
1085 * Used to determine when ORDERED commands should go from
1086 * Dormant to Active status.
1087 */
019c4ca6 1088 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1089 smp_mb__after_atomic_inc();
6708bb27 1090 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1091 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1092 dev->transport->name);
c66ac9db
NB		 1093 return 0;
1094}
1095
a12f41f8 1096/* target_setup_cmd_from_cdb():
c66ac9db
NB		 1097 *
1098 * Called from fabric RX Thread.
1099 */
a12f41f8 1100int target_setup_cmd_from_cdb(
c66ac9db
NB		 1101 struct se_cmd *cmd,
1102 unsigned char *cdb)
1103{
0fd97ccf 1104 struct se_device *dev = cmd->se_dev;
cb4f4d3c 1105 unsigned long flags;
c66ac9db
NB		 1106 int ret;
1107
c66ac9db
NB		 1108 /*
1109 * Ensure that the received CDB is less than the max (252 + 8) bytes
1110 * for VARIABLE_LENGTH_CMD
1111 */
1112 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1113 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1114 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1115 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1116 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1117 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1118 return -EINVAL;
c66ac9db
NB		 1119 }
1120 /*
1121 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1122 * allocate the additional extended CDB buffer now.. Otherwise
1123 * setup the pointer from __t_task_cdb to t_task_cdb.
1124 */
a1d8b49a
AG		 1125 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1126 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1127 GFP_KERNEL);
6708bb27
AG		 1128 if (!cmd->t_task_cdb) {
1129 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1130 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1131 scsi_command_size(cdb),
a1d8b49a 1132 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1133 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1134 cmd->scsi_sense_reason =
1135 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1136 return -ENOMEM;
c66ac9db
NB		 1137 }
1138 } else
a1d8b49a 1139 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1140 /*
a1d8b49a 1141 * Copy the original CDB into cmd->
c66ac9db 1142 */
a1d8b49a 1143 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1144
1145 /*
1146 * Check for an existing UNIT ATTENTION condition
1147 */
1148 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1149 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1150 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1151 return -EINVAL;
1152 }
1153
c87fbd56
CH		 1154 ret = target_alua_state_check(cmd);
1155 if (ret) {
cb4f4d3c 1156 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
c87fbd56
CH		 1157 if (ret > 0)
1158 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1159 else
1160 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
cb4f4d3c
CH		 1161 return -EINVAL;
1162 }
1163
1164 /*
1165 * Check status for SPC-3 Persistent Reservations
1166 */
d977f437
CH		 1167 ret = target_check_reservation(cmd);
1168 if (ret) {
1169 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1170 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1171 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1172 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1173 return ret;
cb4f4d3c
CH		 1174 }
1175
0fd97ccf 1176 ret = dev->transport->parse_cdb(cmd);
c66ac9db
NB		 1177 if (ret < 0)
1178 return ret;
cb4f4d3c
CH		 1179
1180 spin_lock_irqsave(&cmd->t_state_lock, flags);
1181 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1182 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1183
c66ac9db
NB		 1184 /*
1185 * Check for SAM Task Attribute Emulation
1186 */
1187 if (transport_check_alloc_task_attr(cmd) < 0) {
1188 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1189 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1190 return -EINVAL;
c66ac9db
NB		 1191 }
1192 spin_lock(&cmd->se_lun->lun_sep_lock);
1193 if (cmd->se_lun->lun_sep)
1194 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1195 spin_unlock(&cmd->se_lun->lun_sep_lock);
1196 return 0;
1197}
a12f41f8 1198EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1199
695434e1
NB		 1200/*
1201 * Used by fabric module frontends to queue tasks directly.
1202 * Many only be used from process context only
1203 */
1204int transport_handle_cdb_direct(
1205 struct se_cmd *cmd)
1206{
dd8ae59d
NB		 1207 int ret;
1208
695434e1
NB		 1209 if (!cmd->se_lun) {
1210 dump_stack();
6708bb27 1211 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1212 return -EINVAL;
1213 }
1214 if (in_interrupt()) {
1215 dump_stack();
6708bb27 1216 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1217 " from interrupt context\n");
1218 return -EINVAL;
1219 }
dd8ae59d 1220 /*
af877292
CH		 1221 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1222 * outstanding descriptors are handled correctly during shutdown via
1223 * transport_wait_for_tasks()
dd8ae59d
NB		 1224 *
1225 * Also, we don't take cmd->t_state_lock here as we only expect
1226 * this to be called for initial descriptor submission.
1227 */
1228 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1229 cmd->transport_state |= CMD_T_ACTIVE;
1230
dd8ae59d
NB		 1231 /*
1232 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1233 * so follow TRANSPORT_NEW_CMD processing thread context usage
1234 * and call transport_generic_request_failure() if necessary..
1235 */
1236 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1237 if (ret < 0)
1238 transport_generic_request_failure(cmd);
1239
dd8ae59d 1240 return 0;
695434e1
NB		 1241}
1242EXPORT_SYMBOL(transport_handle_cdb_direct);
1243
a026757f
NB		 1244/*
1245 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1246 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1247 *
1248 * @se_cmd: command descriptor to submit
1249 * @se_sess: associated se_sess for endpoint
1250 * @cdb: pointer to SCSI CDB
1251 * @sense: pointer to SCSI sense buffer
1252 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1253 * @data_length: fabric expected data transfer length
1254 * @task_addr: SAM task attribute
1255 * @data_dir: DMA data direction
1256 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1257 * @sgl: struct scatterlist memory for unidirectional mapping
1258 * @sgl_count: scatterlist count for unidirectional mapping
1259 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1260 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1261 *
d6dfc868
RD		 1262 * Returns non zero to signal active I/O shutdown failure. All other
1263 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1264 * but still return zero here.
1265 *
a6360785
NB		 1266 * This may only be called from process context, and also currently
1267 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1268 */
1269int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1270 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1271 u32 data_length, int task_attr, int data_dir, int flags,
1272 struct scatterlist *sgl, u32 sgl_count,
1273 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1274{
1275 struct se_portal_group *se_tpg;
1276 int rc;
1277
1278 se_tpg = se_sess->se_tpg;
1279 BUG_ON(!se_tpg);
1280 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1281 BUG_ON(in_interrupt());
1282 /*
1283 * Initialize se_cmd for target operation. From this point
1284 * exceptions are handled by sending exception status via
1285 * target_core_fabric_ops->queue_status() callback
1286 */
1287 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1288 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1289 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1290 se_cmd->unknown_data_length = 1;
a6360785
NB		 1291 /*
1292 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1293 * se_sess->sess_cmd_list. A second kref_get here is necessary
1294 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1295 * kref_put() to happen during fabric packet acknowledgement.
1296 */
bc187ea6
RD		 1297 rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1298 if (rc)
d6dfc868 1299 return rc;
a6360785
NB		 1300 /*
1301 * Signal bidirectional data payloads to target-core
1302 */
1303 if (flags & TARGET_SCF_BIDI_OP)
1304 se_cmd->se_cmd_flags |= SCF_BIDI;
1305 /*
1306 * Locate se_lun pointer and attach it to struct se_cmd
1307 */
735703ca
NB		 1308 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1309 transport_send_check_condition_and_sense(se_cmd,
1310 se_cmd->scsi_sense_reason, 0);
1311 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1312 return 0;
735703ca 1313 }
d6e0175c 1314
a12f41f8 1315 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca
NB		 1316 if (rc != 0) {
1317 transport_generic_request_failure(se_cmd);
d6dfc868 1318 return 0;
735703ca 1319 }
a026757f
NB		 1320 /*
1321 * When a non zero sgl_count has been passed perform SGL passthrough
1322 * mapping for pre-allocated fabric memory instead of having target
1323 * core perform an internal SGL allocation..
1324 */
1325 if (sgl_count != 0) {
1326 BUG_ON(!sgl);
1327
944981c7
NB		 1328 /*
1329 * A work-around for tcm_loop as some userspace code via
1330 * scsi-generic do not memset their associated read buffers,
1331 * so go ahead and do that here for type non-data CDBs. Also
1332 * note that this is currently guaranteed to be a single SGL
1333 * for this case by target core in target_setup_cmd_from_cdb()
1334 * -> transport_generic_cmd_sequencer().
1335 */
1336 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1337 se_cmd->data_direction == DMA_FROM_DEVICE) {
1338 unsigned char *buf = NULL;
1339
1340 if (sgl)
1341 buf = kmap(sg_page(sgl)) + sgl->offset;
1342
1343 if (buf) {
1344 memset(buf, 0, sgl->length);
1345 kunmap(sg_page(sgl));
1346 }
1347 }
1348
a026757f
NB		 1349 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1350 sgl_bidi, sgl_bidi_count);
1351 if (rc != 0) {
1352 transport_generic_request_failure(se_cmd);
1353 return 0;
1354 }
1355 }
11e319ed
AG		 1356 /*
1357 * Check if we need to delay processing because of ALUA
1358 * Active/NonOptimized primary access state..
1359 */
1360 core_alua_check_nonop_delay(se_cmd);
1361
a6360785 1362 transport_handle_cdb_direct(se_cmd);
d6dfc868 1363 return 0;
a6360785 1364}
a026757f
NB		 1365EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1366
1367/*
1368 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1369 *
1370 * @se_cmd: command descriptor to submit
1371 * @se_sess: associated se_sess for endpoint
1372 * @cdb: pointer to SCSI CDB
1373 * @sense: pointer to SCSI sense buffer
1374 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1375 * @data_length: fabric expected data transfer length
1376 * @task_addr: SAM task attribute
1377 * @data_dir: DMA data direction
1378 * @flags: flags for command submission from target_sc_flags_tables
1379 *
1380 * Returns non zero to signal active I/O shutdown failure. All other
1381 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1382 * but still return zero here.
1383 *
1384 * This may only be called from process context, and also currently
1385 * assumes internal allocation of fabric payload buffer by target-core.
1386 *
1387 * It also assumes interal target core SGL memory allocation.
1388 */
1389int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1390 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1391 u32 data_length, int task_attr, int data_dir, int flags)
1392{
1393 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1394 unpacked_lun, data_length, task_attr, data_dir,
1395 flags, NULL, 0, NULL, 0);
1396}
a6360785
NB		 1397EXPORT_SYMBOL(target_submit_cmd);
1398
9f0d05c2
NB		 1399static void target_complete_tmr_failure(struct work_struct *work)
1400{
1401 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1402
1403 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1404 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
9f0d05c2
NB		 1405}
1406
ea98d7f9
AG		 1407/**
1408 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1409 * for TMR CDBs
1410 *
1411 * @se_cmd: command descriptor to submit
1412 * @se_sess: associated se_sess for endpoint
1413 * @sense: pointer to SCSI sense buffer
1414 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1415 * @fabric_context: fabric context for TMR req
1416 * @tm_type: Type of TM request
c0974f89
NB		 1417 * @gfp: gfp type for caller
1418 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1419 * @flags: submit cmd flags
ea98d7f9
AG		 1420 *
1421 * Callable from all contexts.
1422 **/
1423
c7042cae 1424int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1425 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1426 void *fabric_tmr_ptr, unsigned char tm_type,
1427 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1428{
1429 struct se_portal_group *se_tpg;
1430 int ret;
1431
1432 se_tpg = se_sess->se_tpg;
1433 BUG_ON(!se_tpg);
1434
1435 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1436 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1437 /*
1438 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1439 * allocation failure.
1440 */
c0974f89 1441 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1442 if (ret < 0)
1443 return -ENOMEM;
ea98d7f9 1444
c0974f89
NB		 1445 if (tm_type == TMR_ABORT_TASK)
1446 se_cmd->se_tmr_req->ref_task_tag = tag;
1447
ea98d7f9 1448 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1449 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1450 if (ret) {
1451 core_tmr_release_req(se_cmd->se_tmr_req);
1452 return ret;
1453 }
ea98d7f9 1454
ea98d7f9
AG		 1455 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1456 if (ret) {
9f0d05c2
NB		 1457 /*
1458 * For callback during failure handling, push this work off
1459 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1460 */
1461 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1462 schedule_work(&se_cmd->work);
c7042cae 1463 return 0;
ea98d7f9
AG		 1464 }
1465 transport_generic_handle_tmr(se_cmd);
c7042cae 1466 return 0;
ea98d7f9
AG		 1467}
1468EXPORT_SYMBOL(target_submit_tmr);
1469
cdbb70bb 1470/*
cf572a96 1471 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1472 * has completed.
1473 */
cf572a96 1474bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1475{
cdbb70bb
CH		 1476 bool was_active = false;
1477
cf572a96
CH		 1478 if (cmd->transport_state & CMD_T_BUSY) {
1479 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1480 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1481
cf572a96
CH		 1482 pr_debug("cmd %p waiting to complete\n", cmd);
1483 wait_for_completion(&cmd->task_stop_comp);
1484 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1485
1486 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1487 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1488 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1489 was_active = true;
1490 }
1491
cdbb70bb
CH		 1492 return was_active;
1493}
1494
c66ac9db
NB		 1495/*
1496 * Handle SAM-esque emulation for generic transport request failures.
1497 */
2fbff127 1498void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1499{
07bde79a
NB		 1500 int ret = 0;
1501
6708bb27 1502 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1503 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1504 cmd->t_task_cdb[0]);
03e98c9e 1505 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1506 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1507 cmd->t_state, cmd->scsi_sense_reason);
d43d6aea 1508 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1509 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1510 (cmd->transport_state & CMD_T_STOP) != 0,
1511 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1512
c66ac9db
NB		 1513 /*
1514 * For SAM Task Attribute emulation for failed struct se_cmd
1515 */
019c4ca6 1516 transport_complete_task_attr(cmd);
c66ac9db 1517
03e98c9e
NB		 1518 switch (cmd->scsi_sense_reason) {
1519 case TCM_NON_EXISTENT_LUN:
1520 case TCM_UNSUPPORTED_SCSI_OPCODE:
1521 case TCM_INVALID_CDB_FIELD:
1522 case TCM_INVALID_PARAMETER_LIST:
1523 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1524 case TCM_UNKNOWN_MODE_PAGE:
1525 case TCM_WRITE_PROTECTED:
e2397c70 1526 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1527 case TCM_CHECK_CONDITION_ABORT_CMD:
1528 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1529 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1530 break;
03e98c9e 1531 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1532 /*
1533 * No SENSE Data payload for this case, set SCSI Status
1534 * and queue the response to $FABRIC_MOD.
1535 *
1536 * Uses linux/include/scsi/scsi.h SAM status codes defs
1537 */
1538 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1539 /*
1540 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1541 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1542 * CONFLICT STATUS.
1543 *
1544 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1545 */
e3d6f909 1546 if (cmd->se_sess &&
0fd97ccf 1547 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1548 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1549 cmd->orig_fe_lun, 0x2C,
1550 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1551
07bde79a 1552 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1553 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1554 goto queue_full;
c66ac9db 1555 goto check_stop;
c66ac9db 1556 default:
6708bb27 1557 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1558 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1559 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1560 break;
1561 }
f3146437 1562
03e98c9e
NB		 1563 ret = transport_send_check_condition_and_sense(cmd,
1564 cmd->scsi_sense_reason, 0);
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{
0c2ad7d1 1582 int error = 0;
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
1588 if (cmd->execute_cmd)
1589 error = cmd->execute_cmd(cmd);
5f41a31d
CH		 1590
1591 if (error) {
1592 spin_lock_irq(&cmd->t_state_lock);
1593 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1594 spin_unlock_irq(&cmd->t_state_lock);
1595
1596 transport_generic_request_failure(cmd);
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
c66ac9db 1990/*
ec98f782
AG		 1991 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
1992 * allocating in the core.
c66ac9db
NB		 1993 * @cmd: Associated se_cmd descriptor
1994 * @mem: SGL style memory for TCM WRITE / READ
1995 * @sg_mem_num: Number of SGL elements
1996 * @mem_bidi_in: SGL style memory for TCM BIDI READ
1997 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
1998 *
1999 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2000 * of parameters.
2001 */
2002int transport_generic_map_mem_to_cmd(
2003 struct se_cmd *cmd,
5951146d
AG		 2004 struct scatterlist *sgl,
2005 u32 sgl_count,
2006 struct scatterlist *sgl_bidi,
2007 u32 sgl_bidi_count)
c66ac9db 2008{
5951146d 2009 if (!sgl || !sgl_count)
c66ac9db 2010 return 0;
c66ac9db 2011
64f1db38
CH		 2012 /*
2013 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2014 * scatterlists already have been set to follow what the fabric
2015 * passes for the original expected data transfer length.
2016 */
2017 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2018 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2019 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2020 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2021 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2022 return -EINVAL;
2023 }
c66ac9db 2024
64f1db38
CH		 2025 cmd->t_data_sg = sgl;
2026 cmd->t_data_nents = sgl_count;
c66ac9db 2027
64f1db38
CH		 2028 if (sgl_bidi && sgl_bidi_count) {
2029 cmd->t_bidi_data_sg = sgl_bidi;
2030 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db 2031 }
64f1db38 2032 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 2033 return 0;
2034}
2035EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2036
4949314c 2037void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2038{
ec98f782 2039 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2040 struct page **pages;
2041 int i;
05d1c7c0
AG		 2042
2043 /*
ec98f782
AG		 2044 * We need to take into account a possible offset here for fabrics like
2045 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2046 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2047 */
4949314c
AG		 2048 if (!cmd->t_data_nents)
2049 return NULL;
3717ef0c
PB		 2050
2051 BUG_ON(!sg);
2052 if (cmd->t_data_nents == 1)
4949314c
AG		 2053 return kmap(sg_page(sg)) + sg->offset;
2054
2055 /* >1 page. use vmap */
2056 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3717ef0c
PB		 2057 if (!pages) {
2058 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4949314c 2059 return NULL;
3717ef0c 2060 }
4949314c
AG		 2061
2062 /* convert sg[] to pages[] */
2063 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2064 pages[i] = sg_page(sg);
2065 }
2066
2067 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2068 kfree(pages);
3717ef0c
PB		 2069 if (!cmd->t_data_vmap) {
2070 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4949314c 2071 return NULL;
3717ef0c 2072 }
4949314c
AG		 2073
2074 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2075}
4949314c 2076EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2077
4949314c 2078void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2079{
a1edf9cf 2080 if (!cmd->t_data_nents) {
4949314c 2081 return;
a1edf9cf 2082 } else if (cmd->t_data_nents == 1) {
4949314c 2083 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2084 return;
2085 }
4949314c
AG		 2086
2087 vunmap(cmd->t_data_vmap);
2088 cmd->t_data_vmap = NULL;
05d1c7c0 2089}
4949314c 2090EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2091
c66ac9db 2092static int
05d1c7c0 2093transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2094{
ec98f782
AG		 2095 u32 length = cmd->data_length;
2096 unsigned int nents;
2097 struct page *page;
9db9da33 2098 gfp_t zero_flag;
ec98f782 2099 int i = 0;
c66ac9db 2100
ec98f782
AG		 2101 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2102 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2103 if (!cmd->t_data_sg)
2104 return -ENOMEM;
c66ac9db 2105
ec98f782
AG		 2106 cmd->t_data_nents = nents;
2107 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2108
64f1db38 2109 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2110
ec98f782
AG		 2111 while (length) {
2112 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2113 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2114 if (!page)
2115 goto out;
c66ac9db 2116
ec98f782
AG		 2117 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2118 length -= page_len;
2119 i++;
c66ac9db 2120 }
c66ac9db 2121 return 0;
c66ac9db 2122
ec98f782 2123out:
d0e27c88 2124 while (i > 0) {
ec98f782 2125 i--;
d0e27c88 2126 __free_page(sg_page(&cmd->t_data_sg[i]));
c66ac9db 2127 }
ec98f782
AG		 2128 kfree(cmd->t_data_sg);
2129 cmd->t_data_sg = NULL;
2130 return -ENOMEM;
c66ac9db
NB		 2131}
2132
da0f7619 2133/*
b16a35b0
AG		 2134 * Allocate any required resources to execute the command. For writes we
2135 * might not have the payload yet, so notify the fabric via a call to
2136 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2137 */
a1d8b49a 2138int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2139{
c66ac9db
NB		 2140 int ret = 0;
2141
2142 /*
2143 * Determine is the TCM fabric module has already allocated physical
2144 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2145 * beforehand.
c66ac9db 2146 */
ec98f782
AG		 2147 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2148 cmd->data_length) {
05d1c7c0 2149 ret = transport_generic_get_mem(cmd);
c66ac9db 2150 if (ret < 0)
03e98c9e 2151 goto out_fail;
c66ac9db 2152 }
da0f7619 2153
4101f0a8 2154 atomic_inc(&cmd->t_fe_count);
4101f0a8 2155
c66ac9db 2156 /*
c3196f0c
CH		 2157 * If this command is not a write we can execute it right here,
2158 * for write buffers we need to notify the fabric driver first
2159 * and let it call back once the write buffers are ready.
c66ac9db 2160 */
5f41a31d 2161 target_add_to_state_list(cmd);
c3196f0c
CH		 2162 if (cmd->data_direction != DMA_TO_DEVICE) {
2163 target_execute_cmd(cmd);
2164 return 0;
2165 }
2166
2167 spin_lock_irq(&cmd->t_state_lock);
2168 cmd->t_state = TRANSPORT_WRITE_PENDING;
2169 spin_unlock_irq(&cmd->t_state_lock);
2170
2171 transport_cmd_check_stop(cmd, false);
2172
2173 ret = cmd->se_tfo->write_pending(cmd);
2174 if (ret == -EAGAIN || ret == -ENOMEM)
2175 goto queue_full;
2176
2177 if (ret < 0)
2178 return ret;
2179 return 1;
da0f7619
CH		 2180
2181out_fail:
2182 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2183 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2184 return -EINVAL;
c3196f0c
CH		 2185queue_full:
2186 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2187 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2188 transport_handle_queue_full(cmd, cmd->se_dev);
2189 return 0;
c66ac9db 2190}
a1d8b49a 2191EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2192
e057f533 2193static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2194{
f147abb4
NB		 2195 int ret;
2196
2197 ret = cmd->se_tfo->write_pending(cmd);
2198 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2199 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2200 cmd);
2201 transport_handle_queue_full(cmd, cmd->se_dev);
2202 }
07bde79a
NB		 2203}
2204
39c05f32 2205void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2206{
d14921d6 2207 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2208 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2209 transport_wait_for_tasks(cmd);
2210
35462975 2211 transport_release_cmd(cmd);
d14921d6
NB		 2212 } else {
2213 if (wait_for_tasks)
2214 transport_wait_for_tasks(cmd);
2215
c66ac9db
NB		 2216 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2217
82f1c8a4 2218 if (cmd->se_lun)
c66ac9db 2219 transport_lun_remove_cmd(cmd);
c66ac9db 2220
39c05f32 2221 transport_put_cmd(cmd);
c66ac9db
NB		 2222 }
2223}
2224EXPORT_SYMBOL(transport_generic_free_cmd);
2225
a17f091d
NB		 2226/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2227 * @se_sess: session to reference
2228 * @se_cmd: command descriptor to add
a6360785 2229 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2230 */
bc187ea6
RD		 2231static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2232 bool ack_kref)
a17f091d
NB		 2233{
2234 unsigned long flags;
bc187ea6 2235 int ret = 0;
a17f091d 2236
7481deb4 2237 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2238 /*
2239 * Add a second kref if the fabric caller is expecting to handle
2240 * fabric acknowledgement that requires two target_put_sess_cmd()
2241 * invocations before se_cmd descriptor release.
2242 */
86715569 2243 if (ack_kref == true) {
a6360785 2244 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2245 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2246 }
7481deb4 2247
a17f091d 2248 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2249 if (se_sess->sess_tearing_down) {
2250 ret = -ESHUTDOWN;
2251 goto out;
2252 }
a17f091d
NB		 2253 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2254 se_cmd->check_release = 1;
bc187ea6
RD		 2255
2256out:
a17f091d 2257 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2258 return ret;
a17f091d 2259}
a17f091d 2260
7481deb4 2261static void target_release_cmd_kref(struct kref *kref)
a17f091d 2262{
7481deb4
NB		 2263 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2264 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 2265 unsigned long flags;
2266
2267 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2268 if (list_empty(&se_cmd->se_cmd_list)) {
2269 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2270 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2271 return;
a17f091d 2272 }
a17f091d
NB		 2273 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2274 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2275 complete(&se_cmd->cmd_wait_comp);
7481deb4 2276 return;
a17f091d
NB		 2277 }
2278 list_del(&se_cmd->se_cmd_list);
2279 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2280
7481deb4
NB		 2281 se_cmd->se_tfo->release_cmd(se_cmd);
2282}
2283
2284/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2285 * @se_sess: session to reference
2286 * @se_cmd: command descriptor to drop
2287 */
2288int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2289{
2290 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2291}
2292EXPORT_SYMBOL(target_put_sess_cmd);
2293
1c7b13fe
RD		 2294/* target_sess_cmd_list_set_waiting - Flag all commands in
2295 * sess_cmd_list to complete cmd_wait_comp. Set
2296 * sess_tearing_down so no more commands are queued.
2297 * @se_sess: session to flag
a17f091d 2298 */
1c7b13fe 2299void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2300{
2301 struct se_cmd *se_cmd;
2302 unsigned long flags;
2303
a17f091d 2304 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
a17f091d 2305
1c7b13fe
RD		 2306 WARN_ON(se_sess->sess_tearing_down);
2307 se_sess->sess_tearing_down = 1;
a17f091d 2308
1c7b13fe 2309 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
a17f091d
NB		 2310 se_cmd->cmd_wait_set = 1;
2311
2312 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2313}
1c7b13fe 2314EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2315
2316/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2317 * @se_sess: session to wait for active I/O
2318 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2319 */
2320void target_wait_for_sess_cmds(
2321 struct se_session *se_sess,
2322 int wait_for_tasks)
2323{
2324 struct se_cmd *se_cmd, *tmp_cmd;
2325 bool rc = false;
2326
2327 list_for_each_entry_safe(se_cmd, tmp_cmd,
1c7b13fe 2328 &se_sess->sess_cmd_list, se_cmd_list) {
a17f091d
NB		 2329 list_del(&se_cmd->se_cmd_list);
2330
2331 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2332 " %d\n", se_cmd, se_cmd->t_state,
2333 se_cmd->se_tfo->get_cmd_state(se_cmd));
2334
2335 if (wait_for_tasks) {
2336 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2337 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2338 se_cmd->se_tfo->get_cmd_state(se_cmd));
2339
2340 rc = transport_wait_for_tasks(se_cmd);
2341
2342 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2343 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2344 se_cmd->se_tfo->get_cmd_state(se_cmd));
2345 }
2346
2347 if (!rc) {
2348 wait_for_completion(&se_cmd->cmd_wait_comp);
2349 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2350 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2351 se_cmd->se_tfo->get_cmd_state(se_cmd));
2352 }
2353
2354 se_cmd->se_tfo->release_cmd(se_cmd);
2355 }
2356}
2357EXPORT_SYMBOL(target_wait_for_sess_cmds);
2358
c66ac9db
NB		 2359/* transport_lun_wait_for_tasks():
2360 *
2361 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2362 * an struct se_lun to be successfully shutdown.
2363 */
2364static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2365{
2366 unsigned long flags;
cf572a96
CH		 2367 int ret = 0;
2368
c66ac9db
NB		 2369 /*
2370 * If the frontend has already requested this struct se_cmd to
2371 * be stopped, we can safely ignore this struct se_cmd.
2372 */
a1d8b49a 2373 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2374 if (cmd->transport_state & CMD_T_STOP) {
2375 cmd->transport_state &= ~CMD_T_LUN_STOP;
2376
2377 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2378 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2379 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2380 transport_cmd_check_stop(cmd, false);
e3d6f909 2381 return -EPERM;
c66ac9db 2382 }
7d680f3b 2383 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2384 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2385
cf572a96
CH		 2386 // XXX: audit task_flags checks.
2387 spin_lock_irqsave(&cmd->t_state_lock, flags);
2388 if ((cmd->transport_state & CMD_T_BUSY) &&
2389 (cmd->transport_state & CMD_T_SENT)) {
2390 if (!target_stop_cmd(cmd, &flags))
2391 ret++;
cf572a96 2392 }
5f41a31d 2393 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2394
785fdf70
CH		 2395 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2396 " %d\n", cmd, ret);
c66ac9db 2397 if (!ret) {
6708bb27 2398 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2399 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2400 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2401 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2402 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2403 }
c66ac9db
NB		 2404
2405 return 0;
2406}
2407
c66ac9db
NB		 2408static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2409{
2410 struct se_cmd *cmd = NULL;
2411 unsigned long lun_flags, cmd_flags;
2412 /*
2413 * Do exception processing and return CHECK_CONDITION status to the
2414 * Initiator Port.
2415 */
2416 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2417 while (!list_empty(&lun->lun_cmd_list)) {
2418 cmd = list_first_entry(&lun->lun_cmd_list,
2419 struct se_cmd, se_lun_node);
3d26fea0 2420 list_del_init(&cmd->se_lun_node);
5951146d 2421
a1d8b49a 2422 spin_lock(&cmd->t_state_lock);
6708bb27 2423 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2424 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2425 cmd->se_lun->unpacked_lun,
2426 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2427 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2428 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2429
2430 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2431
6708bb27
AG		 2432 if (!cmd->se_lun) {
2433 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2434 cmd->se_tfo->get_task_tag(cmd),
2435 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2436 BUG();
2437 }
2438 /*
2439 * If the Storage engine still owns the iscsi_cmd_t, determine
2440 * and/or stop its context.
2441 */
6708bb27 2442 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2443 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2444 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2445
e3d6f909 2446 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2447 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2448 continue;
2449 }
2450
6708bb27 2451 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2452 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2453 cmd->se_lun->unpacked_lun,
2454 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2455
a1d8b49a 2456 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2457 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2458 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2459 goto check_cond;
2460 }
7d680f3b 2461 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2462 target_remove_from_state_list(cmd);
a1d8b49a 2463 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2464
c66ac9db
NB		 2465 /*
2466 * The Storage engine stopped this struct se_cmd before it was
2467 * send to the fabric frontend for delivery back to the
2468 * Initiator Node. Return this SCSI CDB back with an
2469 * CHECK_CONDITION status.
2470 */
2471check_cond:
2472 transport_send_check_condition_and_sense(cmd,
2473 TCM_NON_EXISTENT_LUN, 0);
2474 /*
2475 * If the fabric frontend is waiting for this iscsi_cmd_t to
2476 * be released, notify the waiting thread now that LU has
2477 * finished accessing it.
2478 */
a1d8b49a 2479 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2480 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2481 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2482 " struct se_cmd: %p ITT: 0x%08x\n",
2483 lun->unpacked_lun,
e3d6f909 2484 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2485
a1d8b49a 2486 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2487 cmd_flags);
f7113a47 2488 transport_cmd_check_stop(cmd, false);
a1d8b49a 2489 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2490 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2491 continue;
2492 }
6708bb27 2493 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2494 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2495
a1d8b49a 2496 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2497 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2498 }
2499 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2500}
2501
2502static int transport_clear_lun_thread(void *p)
2503{
8359cf43 2504 struct se_lun *lun = p;
c66ac9db
NB		 2505
2506 __transport_clear_lun_from_sessions(lun);
2507 complete(&lun->lun_shutdown_comp);
2508
2509 return 0;
2510}
2511
2512int transport_clear_lun_from_sessions(struct se_lun *lun)
2513{
2514 struct task_struct *kt;
2515
5951146d 2516 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2517 "tcm_cl_%u", lun->unpacked_lun);
2518 if (IS_ERR(kt)) {
6708bb27 2519 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2520 return PTR_ERR(kt);
c66ac9db
NB		 2521 }
2522 wait_for_completion(&lun->lun_shutdown_comp);
2523
2524 return 0;
2525}
2526
d14921d6
NB		 2527/**
2528 * transport_wait_for_tasks - wait for completion to occur
2529 * @cmd: command to wait
c66ac9db 2530 *
d14921d6
NB		 2531 * Called from frontend fabric context to wait for storage engine
2532 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2533 */
a17f091d 2534bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2535{
2536 unsigned long flags;
2537
a1d8b49a 2538 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2539 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2540 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2541 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2542 return false;
d14921d6 2543 }
cb4f4d3c 2544
c8e31f26
AG		 2545 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2546 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2547 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2548 return false;
d14921d6 2549 }
c66ac9db
NB		 2550 /*
2551 * If we are already stopped due to an external event (ie: LUN shutdown)
2552 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2553 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2554 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2555 * has completed its operation on the struct se_cmd.
2556 */
7d680f3b 2557 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2558 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2559 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2560 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2561 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2562 /*
2563 * There is a special case for WRITES where a FE exception +
2564 * LUN shutdown means ConfigFS context is still sleeping on
2565 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2566 * We go ahead and up transport_lun_stop_comp just to be sure
2567 * here.
2568 */
a1d8b49a
AG		 2569 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2570 complete(&cmd->transport_lun_stop_comp);
2571 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2572 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2573
cf572a96 2574 target_remove_from_state_list(cmd);
c66ac9db
NB		 2575 /*
2576 * At this point, the frontend who was the originator of this
2577 * struct se_cmd, now owns the structure and can be released through
2578 * normal means below.
2579 */
6708bb27 2580 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2581 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2582 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2583 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2584
7d680f3b 2585 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2586 }
7d680f3b 2587
3d28934a 2588 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2589 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2590 return false;
d14921d6 2591 }
c66ac9db 2592
7d680f3b 2593 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2594
6708bb27 2595 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2596 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2597 cmd, cmd->se_tfo->get_task_tag(cmd),
2598 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2599
a1d8b49a 2600 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2601
a1d8b49a 2602 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2603
a1d8b49a 2604 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2605 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2606
35d1efe8 2607 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2608 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2609 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2610
d14921d6 2611 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2612
2613 return true;
c66ac9db 2614}
d14921d6 2615EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2616
2617static int transport_get_sense_codes(
2618 struct se_cmd *cmd,
2619 u8 *asc,
2620 u8 *ascq)
2621{
2622 *asc = cmd->scsi_asc;
2623 *ascq = cmd->scsi_ascq;
2624
2625 return 0;
2626}
2627
c66ac9db
NB		 2628int transport_send_check_condition_and_sense(
2629 struct se_cmd *cmd,
2630 u8 reason,
2631 int from_transport)
2632{
2633 unsigned char *buffer = cmd->sense_buffer;
2634 unsigned long flags;
c66ac9db
NB		 2635 u8 asc = 0, ascq = 0;
2636
a1d8b49a 2637 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2638 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2639 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2640 return 0;
2641 }
2642 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2643 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2644
2645 if (!reason && from_transport)
2646 goto after_reason;
2647
2648 if (!from_transport)
2649 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2650
c66ac9db
NB		 2651 /*
2652 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2653 * SENSE KEY values from include/scsi/scsi.h
2654 */
2655 switch (reason) {
2656 case TCM_NON_EXISTENT_LUN:
eb39d340 2657 /* CURRENT ERROR */
9c58b7dd
RD		 2658 buffer[0] = 0x70;
2659 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2660 /* ILLEGAL REQUEST */
9c58b7dd 2661 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2662 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2663 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2664 break;
c66ac9db
NB		 2665 case TCM_UNSUPPORTED_SCSI_OPCODE:
2666 case TCM_SECTOR_COUNT_TOO_MANY:
2667 /* CURRENT ERROR */
9c58b7dd
RD		 2668 buffer[0] = 0x70;
2669 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2670 /* ILLEGAL REQUEST */
9c58b7dd 2671 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2672 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2673 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2674 break;
2675 case TCM_UNKNOWN_MODE_PAGE:
2676 /* CURRENT ERROR */
9c58b7dd
RD		 2677 buffer[0] = 0x70;
2678 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2679 /* ILLEGAL REQUEST */
9c58b7dd 2680 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2681 /* INVALID FIELD IN CDB */
9c58b7dd 2682 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2683 break;
2684 case TCM_CHECK_CONDITION_ABORT_CMD:
2685 /* CURRENT ERROR */
9c58b7dd
RD		 2686 buffer[0] = 0x70;
2687 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2688 /* ABORTED COMMAND */
9c58b7dd 2689 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2690 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2691 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2692 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2693 break;
2694 case TCM_INCORRECT_AMOUNT_OF_DATA:
2695 /* CURRENT ERROR */
9c58b7dd
RD		 2696 buffer[0] = 0x70;
2697 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2698 /* ABORTED COMMAND */
9c58b7dd 2699 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2700 /* WRITE ERROR */
9c58b7dd 2701 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2702 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2703 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2704 break;
2705 case TCM_INVALID_CDB_FIELD:
2706 /* CURRENT ERROR */
9c58b7dd
RD		 2707 buffer[0] = 0x70;
2708 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2709 /* ILLEGAL REQUEST */
9c58b7dd 2710 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2711 /* INVALID FIELD IN CDB */
9c58b7dd 2712 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2713 break;
2714 case TCM_INVALID_PARAMETER_LIST:
2715 /* CURRENT ERROR */
9c58b7dd
RD		 2716 buffer[0] = 0x70;
2717 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2718 /* ILLEGAL REQUEST */
9c58b7dd 2719 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2720 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2721 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db
NB		 2722 break;
2723 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2724 /* CURRENT ERROR */
9c58b7dd
RD		 2725 buffer[0] = 0x70;
2726 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2727 /* ABORTED COMMAND */
9c58b7dd 2728 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2729 /* WRITE ERROR */
9c58b7dd 2730 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2731 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2732 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2733 break;
2734 case TCM_SERVICE_CRC_ERROR:
2735 /* CURRENT ERROR */
9c58b7dd
RD		 2736 buffer[0] = 0x70;
2737 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2738 /* ABORTED COMMAND */
9c58b7dd 2739 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2740 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2741 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2742 /* N/A */
9c58b7dd 2743 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2744 break;
2745 case TCM_SNACK_REJECTED:
2746 /* CURRENT ERROR */
9c58b7dd
RD		 2747 buffer[0] = 0x70;
2748 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2749 /* ABORTED COMMAND */
9c58b7dd 2750 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2751 /* READ ERROR */
9c58b7dd 2752 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2753 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2754 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2755 break;
2756 case TCM_WRITE_PROTECTED:
2757 /* CURRENT ERROR */
9c58b7dd
RD		 2758 buffer[0] = 0x70;
2759 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2760 /* DATA PROTECT */
9c58b7dd 2761 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2762 /* WRITE PROTECTED */
9c58b7dd 2763 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2764 break;
e2397c70
RD		 2765 case TCM_ADDRESS_OUT_OF_RANGE:
2766 /* CURRENT ERROR */
9c58b7dd
RD		 2767 buffer[0] = 0x70;
2768 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2769 /* ILLEGAL REQUEST */
9c58b7dd 2770 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2771 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2772 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2773 break;
c66ac9db
NB		 2774 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2775 /* CURRENT ERROR */
9c58b7dd
RD		 2776 buffer[0] = 0x70;
2777 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2778 /* UNIT ATTENTION */
9c58b7dd 2779 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2780 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2781 buffer[SPC_ASC_KEY_OFFSET] = asc;
2782 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2783 break;
2784 case TCM_CHECK_CONDITION_NOT_READY:
2785 /* CURRENT ERROR */
9c58b7dd
RD		 2786 buffer[0] = 0x70;
2787 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2788 /* Not Ready */
9c58b7dd 2789 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2790 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2791 buffer[SPC_ASC_KEY_OFFSET] = asc;
2792 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2793 break;
2794 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2795 default:
2796 /* CURRENT ERROR */
9c58b7dd
RD		 2797 buffer[0] = 0x70;
2798 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2799 /* ILLEGAL REQUEST */
9c58b7dd 2800 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2801 /* LOGICAL UNIT COMMUNICATION FAILURE */
9c58b7dd 2802 buffer[SPC_ASC_KEY_OFFSET] = 0x80;
c66ac9db
NB		 2803 break;
2804 }
2805 /*
2806 * This code uses linux/include/scsi/scsi.h SAM status codes!
2807 */
2808 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2809 /*
2810 * Automatically padded, this value is encoded in the fabric's
2811 * data_length response PDU containing the SCSI defined sense data.
2812 */
9c58b7dd 2813 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2814
2815after_reason:
07bde79a 2816 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2817}
2818EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2819
2820int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2821{
2822 int ret = 0;
2823
7d680f3b 2824 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 2825 if (!send_status ||
c66ac9db
NB		 2826 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2827 return 1;
8b1e1244 2828
6708bb27 2829 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 2830 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 2831 cmd->t_task_cdb[0],
e3d6f909 2832 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2833
c66ac9db 2834 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 2835 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2836 ret = 1;
2837 }
2838 return ret;
2839}
2840EXPORT_SYMBOL(transport_check_aborted_status);
2841
2842void transport_send_task_abort(struct se_cmd *cmd)
2843{
c252f003
NB		 2844 unsigned long flags;
2845
2846 spin_lock_irqsave(&cmd->t_state_lock, flags);
2847 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2848 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2849 return;
2850 }
2851 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2852
c66ac9db
NB		 2853 /*
2854 * If there are still expected incoming fabric WRITEs, we wait
2855 * until until they have completed before sending a TASK_ABORTED
2856 * response. This response with TASK_ABORTED status will be
2857 * queued back to fabric module by transport_check_aborted_status().
2858 */
2859 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2860 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2861 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2862 smp_mb__after_atomic_inc();
c66ac9db
NB		 2863 }
2864 }
2865 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2866
6708bb27 2867 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2868 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2869 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2870
e3d6f909 2871 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2872}
2873
af877292 2874static void target_tmr_work(struct work_struct *work)
c66ac9db 2875{
af877292 2876 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2877 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2878 struct se_tmr_req *tmr = cmd->se_tmr_req;
2879 int ret;
2880
2881 switch (tmr->function) {
5c6cd613 2882 case TMR_ABORT_TASK:
3d28934a 2883 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2884 break;
5c6cd613
NB		 2885 case TMR_ABORT_TASK_SET:
2886 case TMR_CLEAR_ACA:
2887 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2888 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2889 break;
5c6cd613 2890 case TMR_LUN_RESET:
c66ac9db
NB		 2891 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2892 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2893 TMR_FUNCTION_REJECTED;
2894 break;
5c6cd613 2895 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2896 tmr->response = TMR_FUNCTION_REJECTED;
2897 break;
5c6cd613 2898 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2899 tmr->response = TMR_FUNCTION_REJECTED;
2900 break;
c66ac9db 2901 default:
6708bb27 2902 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2903 tmr->function);
2904 tmr->response = TMR_FUNCTION_REJECTED;
2905 break;
2906 }
2907
2908 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2909 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2910
b7b8bef7 2911 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2912}
2913
af877292
CH		 2914int transport_generic_handle_tmr(
2915 struct se_cmd *cmd)
c66ac9db 2916{
af877292
CH		 2917 INIT_WORK(&cmd->work, target_tmr_work);
2918 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2919 return 0;
2920}
af877292 2921EXPORT_SYMBOL(transport_generic_handle_tmr);
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