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target: Fix sense data for out-of-bounds IO operations
[mirror_ubuntu-artful-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 *
fd9a11d7 6 * (c) Copyright 2002-2012 RisingTide Systems LLC.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
31#include <linux/blkdev.h>
32#include <linux/spinlock.h>
c66ac9db
NB		 33#include <linux/kthread.h>
34#include <linux/in.h>
35#include <linux/cdrom.h>
827509e3 36#include <linux/module.h>
015487b8 37#include <linux/ratelimit.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
41#include <scsi/scsi.h>
42#include <scsi/scsi_cmnd.h>
e66ecd50 43#include <scsi/scsi_tcq.h>
c66ac9db
NB		 44
45#include <target/target_core_base.h>
c4795fb2
CH		 46#include <target/target_core_backend.h>
47#include <target/target_core_fabric.h>
c66ac9db
NB		 48#include <target/target_core_configfs.h>
49
e26d99ae 50#include "target_core_internal.h"
c66ac9db 51#include "target_core_alua.h"
c66ac9db 52#include "target_core_pr.h"
c66ac9db
NB		 53#include "target_core_ua.h"
54
35e0e757 55static struct workqueue_struct *target_completion_wq;
c66ac9db 56static struct kmem_cache *se_sess_cache;
c66ac9db 57struct kmem_cache *se_ua_cache;
c66ac9db
NB		 58struct kmem_cache *t10_pr_reg_cache;
59struct kmem_cache *t10_alua_lu_gp_cache;
60struct kmem_cache *t10_alua_lu_gp_mem_cache;
61struct kmem_cache *t10_alua_tg_pt_gp_cache;
62struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
63
c66ac9db 64static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 65static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 66 struct se_device *dev);
05d1c7c0 67static int transport_generic_get_mem(struct se_cmd *cmd);
bc187ea6 68static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
39c05f32 69static void transport_put_cmd(struct se_cmd *cmd);
35e0e757 70static void target_complete_ok_work(struct work_struct *work);
c66ac9db 71
e3d6f909 72int init_se_kmem_caches(void)
c66ac9db 73{
c66ac9db
NB		 74 se_sess_cache = kmem_cache_create("se_sess_cache",
75 sizeof(struct se_session), __alignof__(struct se_session),
76 0, NULL);
6708bb27
AG		 77 if (!se_sess_cache) {
78 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 79 " failed\n");
c8e31f26 80 goto out;
c66ac9db
NB		 81 }
82 se_ua_cache = kmem_cache_create("se_ua_cache",
83 sizeof(struct se_ua), __alignof__(struct se_ua),
84 0, NULL);
6708bb27
AG		 85 if (!se_ua_cache) {
86 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 87 goto out_free_sess_cache;
c66ac9db 88 }
c66ac9db
NB		 89 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
90 sizeof(struct t10_pr_registration),
91 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 92 if (!t10_pr_reg_cache) {
93 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 94 " failed\n");
35e0e757 95 goto out_free_ua_cache;
c66ac9db
NB		 96 }
97 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
98 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
99 0, NULL);
6708bb27
AG		 100 if (!t10_alua_lu_gp_cache) {
101 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 102 " failed\n");
35e0e757 103 goto out_free_pr_reg_cache;
c66ac9db
NB		 104 }
105 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
106 sizeof(struct t10_alua_lu_gp_member),
107 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 108 if (!t10_alua_lu_gp_mem_cache) {
109 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 110 "cache failed\n");
35e0e757 111 goto out_free_lu_gp_cache;
c66ac9db
NB		 112 }
113 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
114 sizeof(struct t10_alua_tg_pt_gp),
115 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 116 if (!t10_alua_tg_pt_gp_cache) {
117 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 118 "cache failed\n");
35e0e757 119 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 120 }
121 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
122 "t10_alua_tg_pt_gp_mem_cache",
123 sizeof(struct t10_alua_tg_pt_gp_member),
124 __alignof__(struct t10_alua_tg_pt_gp_member),
125 0, NULL);
6708bb27
AG		 126 if (!t10_alua_tg_pt_gp_mem_cache) {
127 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 128 "mem_t failed\n");
35e0e757 129 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 130 }
131
35e0e757
CH		 132 target_completion_wq = alloc_workqueue("target_completion",
133 WQ_MEM_RECLAIM, 0);
134 if (!target_completion_wq)
135 goto out_free_tg_pt_gp_mem_cache;
136
c66ac9db 137 return 0;
35e0e757
CH		 138
139out_free_tg_pt_gp_mem_cache:
140 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
141out_free_tg_pt_gp_cache:
142 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
143out_free_lu_gp_mem_cache:
144 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
145out_free_lu_gp_cache:
146 kmem_cache_destroy(t10_alua_lu_gp_cache);
147out_free_pr_reg_cache:
148 kmem_cache_destroy(t10_pr_reg_cache);
149out_free_ua_cache:
150 kmem_cache_destroy(se_ua_cache);
151out_free_sess_cache:
152 kmem_cache_destroy(se_sess_cache);
c66ac9db 153out:
e3d6f909 154 return -ENOMEM;
c66ac9db
NB		 155}
156
e3d6f909 157void release_se_kmem_caches(void)
c66ac9db 158{
35e0e757 159 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 160 kmem_cache_destroy(se_sess_cache);
161 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 162 kmem_cache_destroy(t10_pr_reg_cache);
163 kmem_cache_destroy(t10_alua_lu_gp_cache);
164 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
165 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
166 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 167}
168
e3d6f909
AG		 169/* This code ensures unique mib indexes are handed out. */
170static DEFINE_SPINLOCK(scsi_mib_index_lock);
171static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 172
173/*
174 * Allocate a new row index for the entry type specified
175 */
176u32 scsi_get_new_index(scsi_index_t type)
177{
178 u32 new_index;
179
e3d6f909 180 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 181
e3d6f909
AG		 182 spin_lock(&scsi_mib_index_lock);
183 new_index = ++scsi_mib_index[type];
184 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 185
186 return new_index;
187}
188
dbc5623e 189void transport_subsystem_check_init(void)
c66ac9db
NB		 190{
191 int ret;
283669d2 192 static int sub_api_initialized;
c66ac9db 193
dbc5623e
NB		 194 if (sub_api_initialized)
195 return;
196
c66ac9db
NB		 197 ret = request_module("target_core_iblock");
198 if (ret != 0)
6708bb27 199 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 200
201 ret = request_module("target_core_file");
202 if (ret != 0)
6708bb27 203 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 204
205 ret = request_module("target_core_pscsi");
206 if (ret != 0)
6708bb27 207 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 208
e3d6f909 209 sub_api_initialized = 1;
c66ac9db
NB		 210}
211
212struct se_session *transport_init_session(void)
213{
214 struct se_session *se_sess;
215
216 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 217 if (!se_sess) {
218 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 219 " se_sess_cache\n");
220 return ERR_PTR(-ENOMEM);
221 }
222 INIT_LIST_HEAD(&se_sess->sess_list);
223 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 224 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
a17f091d 225 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 226 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 227
228 return se_sess;
229}
230EXPORT_SYMBOL(transport_init_session);
231
232/*
140854cb 233 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 234 */
235void __transport_register_session(
236 struct se_portal_group *se_tpg,
237 struct se_node_acl *se_nacl,
238 struct se_session *se_sess,
239 void *fabric_sess_ptr)
240{
241 unsigned char buf[PR_REG_ISID_LEN];
242
243 se_sess->se_tpg = se_tpg;
244 se_sess->fabric_sess_ptr = fabric_sess_ptr;
245 /*
246 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
247 *
248 * Only set for struct se_session's that will actually be moving I/O.
249 * eg: *NOT* discovery sessions.
250 */
251 if (se_nacl) {
252 /*
253 * If the fabric module supports an ISID based TransportID,
254 * save this value in binary from the fabric I_T Nexus now.
255 */
e3d6f909 256 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 257 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 258 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 259 &buf[0], PR_REG_ISID_LEN);
260 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
261 }
afb999ff
NB		 262 kref_get(&se_nacl->acl_kref);
263
c66ac9db
NB		 264 spin_lock_irq(&se_nacl->nacl_sess_lock);
265 /*
266 * The se_nacl->nacl_sess pointer will be set to the
267 * last active I_T Nexus for each struct se_node_acl.
268 */
269 se_nacl->nacl_sess = se_sess;
270
271 list_add_tail(&se_sess->sess_acl_list,
272 &se_nacl->acl_sess_list);
273 spin_unlock_irq(&se_nacl->nacl_sess_lock);
274 }
275 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
276
6708bb27 277 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 278 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 279}
280EXPORT_SYMBOL(__transport_register_session);
281
282void transport_register_session(
283 struct se_portal_group *se_tpg,
284 struct se_node_acl *se_nacl,
285 struct se_session *se_sess,
286 void *fabric_sess_ptr)
287{
140854cb
NB		 288 unsigned long flags;
289
290 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 291 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 292 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 293}
294EXPORT_SYMBOL(transport_register_session);
295
ecf0dd66 296static void target_release_session(struct kref *kref)
41ac82b6
NB		 297{
298 struct se_session *se_sess = container_of(kref,
299 struct se_session, sess_kref);
300 struct se_portal_group *se_tpg = se_sess->se_tpg;
301
302 se_tpg->se_tpg_tfo->close_session(se_sess);
303}
304
305void target_get_session(struct se_session *se_sess)
306{
307 kref_get(&se_sess->sess_kref);
308}
309EXPORT_SYMBOL(target_get_session);
310
33933a0e 311void target_put_session(struct se_session *se_sess)
41ac82b6 312{
4149268e
JE		 313 struct se_portal_group *tpg = se_sess->se_tpg;
314
315 if (tpg->se_tpg_tfo->put_session != NULL) {
316 tpg->se_tpg_tfo->put_session(se_sess);
317 return;
318 }
33933a0e 319 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 320}
321EXPORT_SYMBOL(target_put_session);
322
afb999ff
NB		 323static void target_complete_nacl(struct kref *kref)
324{
325 struct se_node_acl *nacl = container_of(kref,
326 struct se_node_acl, acl_kref);
327
328 complete(&nacl->acl_free_comp);
329}
330
331void target_put_nacl(struct se_node_acl *nacl)
332{
333 kref_put(&nacl->acl_kref, target_complete_nacl);
334}
335
c66ac9db
NB		 336void transport_deregister_session_configfs(struct se_session *se_sess)
337{
338 struct se_node_acl *se_nacl;
23388864 339 unsigned long flags;
c66ac9db
NB		 340 /*
341 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
342 */
343 se_nacl = se_sess->se_node_acl;
6708bb27 344 if (se_nacl) {
23388864 345 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 346 if (se_nacl->acl_stop == 0)
347 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 348 /*
349 * If the session list is empty, then clear the pointer.
350 * Otherwise, set the struct se_session pointer from the tail
351 * element of the per struct se_node_acl active session list.
352 */
353 if (list_empty(&se_nacl->acl_sess_list))
354 se_nacl->nacl_sess = NULL;
355 else {
356 se_nacl->nacl_sess = container_of(
357 se_nacl->acl_sess_list.prev,
358 struct se_session, sess_acl_list);
359 }
23388864 360 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 361 }
362}
363EXPORT_SYMBOL(transport_deregister_session_configfs);
364
365void transport_free_session(struct se_session *se_sess)
366{
367 kmem_cache_free(se_sess_cache, se_sess);
368}
369EXPORT_SYMBOL(transport_free_session);
370
371void transport_deregister_session(struct se_session *se_sess)
372{
373 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 374 struct target_core_fabric_ops *se_tfo;
c66ac9db 375 struct se_node_acl *se_nacl;
e63a8e19 376 unsigned long flags;
01468346 377 bool comp_nacl = true;
c66ac9db 378
6708bb27 379 if (!se_tpg) {
c66ac9db
NB		 380 transport_free_session(se_sess);
381 return;
382 }
01468346 383 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 384
e63a8e19 385 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 386 list_del(&se_sess->sess_list);
387 se_sess->se_tpg = NULL;
388 se_sess->fabric_sess_ptr = NULL;
e63a8e19 389 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 390
391 /*
392 * Determine if we need to do extra work for this initiator node's
393 * struct se_node_acl if it had been previously dynamically generated.
394 */
395 se_nacl = se_sess->se_node_acl;
01468346
NB		 396
397 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
398 if (se_nacl && se_nacl->dynamic_node_acl) {
399 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
400 list_del(&se_nacl->acl_list);
401 se_tpg->num_node_acls--;
402 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
403 core_tpg_wait_for_nacl_pr_ref(se_nacl);
404 core_free_device_list_for_node(se_nacl, se_tpg);
405 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
406
407 comp_nacl = false;
408 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 409 }
c66ac9db 410 }
01468346 411 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 412
6708bb27 413 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 414 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 415 /*
afb999ff
NB		 416 * If last kref is dropping now for an explict NodeACL, awake sleeping
417 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
418 * removal context.
01468346
NB		 419 */
420 if (se_nacl && comp_nacl == true)
afb999ff 421 target_put_nacl(se_nacl);
01468346 422
afb999ff 423 transport_free_session(se_sess);
c66ac9db
NB		 424}
425EXPORT_SYMBOL(transport_deregister_session);
426
427/*
a1d8b49a 428 * Called with cmd->t_state_lock held.
c66ac9db 429 */
cf572a96 430static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 431{
42bf829e 432 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 433 unsigned long flags;
434
42bf829e
CH		 435 if (!dev)
436 return;
c66ac9db 437
cf572a96
CH		 438 if (cmd->transport_state & CMD_T_BUSY)
439 return;
c66ac9db 440
cf572a96
CH		 441 spin_lock_irqsave(&dev->execute_task_lock, flags);
442 if (cmd->state_active) {
443 list_del(&cmd->state_list);
cf572a96 444 cmd->state_active = false;
c66ac9db 445 }
cf572a96 446 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 447}
448
f7113a47 449static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
c66ac9db
NB		 450{
451 unsigned long flags;
452
a1d8b49a 453 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 454 /*
455 * Determine if IOCTL context caller in requesting the stopping of this
456 * command for LUN shutdown purposes.
457 */
7d680f3b
CH		 458 if (cmd->transport_state & CMD_T_LUN_STOP) {
459 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
460 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 461
7d680f3b 462 cmd->transport_state &= ~CMD_T_ACTIVE;
f7113a47 463 if (remove_from_lists)
cf572a96 464 target_remove_from_state_list(cmd);
a1d8b49a 465 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 466
a1d8b49a 467 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 468 return 1;
469 }
f7113a47
CH		 470
471 if (remove_from_lists) {
472 target_remove_from_state_list(cmd);
473
474 /*
475 * Clear struct se_cmd->se_lun before the handoff to FE.
476 */
477 cmd->se_lun = NULL;
478 }
479
c66ac9db
NB		 480 /*
481 * Determine if frontend context caller is requesting the stopping of
e3d6f909 482 * this command for frontend exceptions.
c66ac9db 483 */
7d680f3b
CH		 484 if (cmd->transport_state & CMD_T_STOP) {
485 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
486 __func__, __LINE__,
e3d6f909 487 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 488
a1d8b49a 489 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 490
a1d8b49a 491 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 492 return 1;
493 }
f7113a47
CH		 494
495 cmd->transport_state &= ~CMD_T_ACTIVE;
496 if (remove_from_lists) {
497 /*
498 * Some fabric modules like tcm_loop can release
499 * their internally allocated I/O reference now and
500 * struct se_cmd now.
501 *
502 * Fabric modules are expected to return '1' here if the
503 * se_cmd being passed is released at this point,
504 * or zero if not being released.
505 */
506 if (cmd->se_tfo->check_stop_free != NULL) {
507 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
508 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 509 }
f7113a47 510 }
c66ac9db 511
a1d8b49a 512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 513 return 0;
514}
515
516static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
517{
f7113a47 518 return transport_cmd_check_stop(cmd, true);
c66ac9db
NB		 519}
520
521static void transport_lun_remove_cmd(struct se_cmd *cmd)
522{
e3d6f909 523 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 524 unsigned long flags;
525
526 if (!lun)
527 return;
528
a1d8b49a 529 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 530 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
531 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 532 target_remove_from_state_list(cmd);
c66ac9db 533 }
a1d8b49a 534 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 535
c66ac9db 536 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 537 if (!list_empty(&cmd->se_lun_node))
538 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 539 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
540}
541
542void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
543{
c66ac9db
NB		 544 if (transport_cmd_check_stop_to_fabric(cmd))
545 return;
af877292 546 if (remove)
e6a2573f 547 transport_put_cmd(cmd);
c66ac9db
NB		 548}
549
35e0e757
CH		 550static void target_complete_failure_work(struct work_struct *work)
551{
552 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
553
de103c93
CH		 554 transport_generic_request_failure(cmd,
555 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 556}
557
6138ed2a 558/*
d5829eac
PB		 559 * Used when asking transport to copy Sense Data from the underlying
560 * Linux/SCSI struct scsi_cmnd
6138ed2a 561 */
d5829eac 562static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 563{
6138ed2a 564 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 565
566 WARN_ON(!cmd->se_lun);
567
568 if (!dev)
d5829eac 569 return NULL;
6138ed2a 570
d5829eac
PB		 571 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
572 return NULL;
6138ed2a 573
9c58b7dd 574 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 575
d5829eac 576 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 577 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 578 return cmd->sense_buffer;
6138ed2a
PB		 579}
580
5787cacd 581void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 582{
42bf829e 583 struct se_device *dev = cmd->se_dev;
5787cacd 584 int success = scsi_status == GOOD;
c66ac9db 585 unsigned long flags;
c66ac9db 586
5787cacd
CH		 587 cmd->scsi_status = scsi_status;
588
589
a1d8b49a 590 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 591 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 592
c66ac9db 593 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 594 dev->transport->transport_complete(cmd,
595 cmd->t_data_sg,
596 transport_get_sense_buffer(cmd));
597 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 598 success = 1;
c66ac9db
NB		 599 }
600
601 /*
5787cacd 602 * See if we are waiting to complete for an exception condition.
c66ac9db 603 */
cf572a96 604 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 605 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 606 complete(&cmd->task_stop_comp);
c66ac9db
NB		 607 return;
608 }
2235007c
CH		 609
610 if (!success)
7d680f3b 611 cmd->transport_state |= CMD_T_FAILED;
2235007c 612
3d28934a
NB		 613 /*
614 * Check for case where an explict ABORT_TASK has been received
615 * and transport_wait_for_tasks() will be waiting for completion..
616 */
617 if (cmd->transport_state & CMD_T_ABORTED &&
618 cmd->transport_state & CMD_T_STOP) {
619 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
620 complete(&cmd->t_transport_stop_comp);
621 return;
622 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 623 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 624 } else {
35e0e757 625 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 626 }
35e0e757 627
35e0e757 628 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 629 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 631
35e0e757 632 queue_work(target_completion_wq, &cmd->work);
c66ac9db 633}
6bb35e00
CH		 634EXPORT_SYMBOL(target_complete_cmd);
635
cf572a96 636static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 637{
cf572a96
CH		 638 struct se_device *dev = cmd->se_dev;
639 unsigned long flags;
c66ac9db 640
cf572a96
CH		 641 spin_lock_irqsave(&dev->execute_task_lock, flags);
642 if (!cmd->state_active) {
643 list_add_tail(&cmd->state_list, &dev->state_list);
644 cmd->state_active = true;
c66ac9db 645 }
cf572a96 646 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 647}
648
07bde79a 649/*
f147abb4 650 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 651 */
7a6f0a1e
CH		 652static void transport_write_pending_qf(struct se_cmd *cmd);
653static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 654
0fd97ccf 655void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 656{
657 struct se_device *dev = container_of(work, struct se_device,
658 qf_work_queue);
bcac364a 659 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 660 struct se_cmd *cmd, *cmd_tmp;
661
662 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 663 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
664 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 665
bcac364a 666 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 667 list_del(&cmd->se_qf_node);
668 atomic_dec(&dev->dev_qf_count);
669 smp_mb__after_atomic_dec();
07bde79a 670
6708bb27 671 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 672 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 673 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 674 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
675 : "UNKNOWN");
f7a5cc0b 676
7a6f0a1e
CH		 677 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
678 transport_write_pending_qf(cmd);
679 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
680 transport_complete_qf(cmd);
07bde79a 681 }
07bde79a
NB		 682}
683
c66ac9db
NB		 684unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
685{
686 switch (cmd->data_direction) {
687 case DMA_NONE:
688 return "NONE";
689 case DMA_FROM_DEVICE:
690 return "READ";
691 case DMA_TO_DEVICE:
692 return "WRITE";
693 case DMA_BIDIRECTIONAL:
694 return "BIDI";
695 default:
696 break;
697 }
698
699 return "UNKNOWN";
700}
701
702void transport_dump_dev_state(
703 struct se_device *dev,
704 char *b,
705 int *bl)
706{
707 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 708 if (dev->export_count)
c66ac9db 709 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 710 else
c66ac9db 711 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 712
5f41a31d 713 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 714 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 715 dev->dev_attrib.block_size,
716 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 717 *bl += sprintf(b + *bl, " ");
718}
719
c66ac9db
NB		 720void transport_dump_vpd_proto_id(
721 struct t10_vpd *vpd,
722 unsigned char *p_buf,
723 int p_buf_len)
724{
725 unsigned char buf[VPD_TMP_BUF_SIZE];
726 int len;
727
728 memset(buf, 0, VPD_TMP_BUF_SIZE);
729 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
730
731 switch (vpd->protocol_identifier) {
732 case 0x00:
733 sprintf(buf+len, "Fibre Channel\n");
734 break;
735 case 0x10:
736 sprintf(buf+len, "Parallel SCSI\n");
737 break;
738 case 0x20:
739 sprintf(buf+len, "SSA\n");
740 break;
741 case 0x30:
742 sprintf(buf+len, "IEEE 1394\n");
743 break;
744 case 0x40:
745 sprintf(buf+len, "SCSI Remote Direct Memory Access"
746 " Protocol\n");
747 break;
748 case 0x50:
749 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
750 break;
751 case 0x60:
752 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
753 break;
754 case 0x70:
755 sprintf(buf+len, "Automation/Drive Interface Transport"
756 " Protocol\n");
757 break;
758 case 0x80:
759 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
760 break;
761 default:
762 sprintf(buf+len, "Unknown 0x%02x\n",
763 vpd->protocol_identifier);
764 break;
765 }
766
767 if (p_buf)
768 strncpy(p_buf, buf, p_buf_len);
769 else
6708bb27 770 pr_debug("%s", buf);
c66ac9db
NB		 771}
772
773void
774transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
775{
776 /*
777 * Check if the Protocol Identifier Valid (PIV) bit is set..
778 *
779 * from spc3r23.pdf section 7.5.1
780 */
781 if (page_83[1] & 0x80) {
782 vpd->protocol_identifier = (page_83[0] & 0xf0);
783 vpd->protocol_identifier_set = 1;
784 transport_dump_vpd_proto_id(vpd, NULL, 0);
785 }
786}
787EXPORT_SYMBOL(transport_set_vpd_proto_id);
788
789int transport_dump_vpd_assoc(
790 struct t10_vpd *vpd,
791 unsigned char *p_buf,
792 int p_buf_len)
793{
794 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 795 int ret = 0;
796 int len;
c66ac9db
NB		 797
798 memset(buf, 0, VPD_TMP_BUF_SIZE);
799 len = sprintf(buf, "T10 VPD Identifier Association: ");
800
801 switch (vpd->association) {
802 case 0x00:
803 sprintf(buf+len, "addressed logical unit\n");
804 break;
805 case 0x10:
806 sprintf(buf+len, "target port\n");
807 break;
808 case 0x20:
809 sprintf(buf+len, "SCSI target device\n");
810 break;
811 default:
812 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 813 ret = -EINVAL;
c66ac9db
NB		 814 break;
815 }
816
817 if (p_buf)
818 strncpy(p_buf, buf, p_buf_len);
819 else
6708bb27 820 pr_debug("%s", buf);
c66ac9db
NB		 821
822 return ret;
823}
824
825int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
826{
827 /*
828 * The VPD identification association..
829 *
830 * from spc3r23.pdf Section 7.6.3.1 Table 297
831 */
832 vpd->association = (page_83[1] & 0x30);
833 return transport_dump_vpd_assoc(vpd, NULL, 0);
834}
835EXPORT_SYMBOL(transport_set_vpd_assoc);
836
837int transport_dump_vpd_ident_type(
838 struct t10_vpd *vpd,
839 unsigned char *p_buf,
840 int p_buf_len)
841{
842 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 843 int ret = 0;
844 int len;
c66ac9db
NB		 845
846 memset(buf, 0, VPD_TMP_BUF_SIZE);
847 len = sprintf(buf, "T10 VPD Identifier Type: ");
848
849 switch (vpd->device_identifier_type) {
850 case 0x00:
851 sprintf(buf+len, "Vendor specific\n");
852 break;
853 case 0x01:
854 sprintf(buf+len, "T10 Vendor ID based\n");
855 break;
856 case 0x02:
857 sprintf(buf+len, "EUI-64 based\n");
858 break;
859 case 0x03:
860 sprintf(buf+len, "NAA\n");
861 break;
862 case 0x04:
863 sprintf(buf+len, "Relative target port identifier\n");
864 break;
865 case 0x08:
866 sprintf(buf+len, "SCSI name string\n");
867 break;
868 default:
869 sprintf(buf+len, "Unsupported: 0x%02x\n",
870 vpd->device_identifier_type);
e3d6f909 871 ret = -EINVAL;
c66ac9db
NB		 872 break;
873 }
874
e3d6f909
AG		 875 if (p_buf) {
876 if (p_buf_len < strlen(buf)+1)
877 return -EINVAL;
c66ac9db 878 strncpy(p_buf, buf, p_buf_len);
e3d6f909 879 } else {
6708bb27 880 pr_debug("%s", buf);
e3d6f909 881 }
c66ac9db
NB		 882
883 return ret;
884}
885
886int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
887{
888 /*
889 * The VPD identifier type..
890 *
891 * from spc3r23.pdf Section 7.6.3.1 Table 298
892 */
893 vpd->device_identifier_type = (page_83[1] & 0x0f);
894 return transport_dump_vpd_ident_type(vpd, NULL, 0);
895}
896EXPORT_SYMBOL(transport_set_vpd_ident_type);
897
898int transport_dump_vpd_ident(
899 struct t10_vpd *vpd,
900 unsigned char *p_buf,
901 int p_buf_len)
902{
903 unsigned char buf[VPD_TMP_BUF_SIZE];
904 int ret = 0;
905
906 memset(buf, 0, VPD_TMP_BUF_SIZE);
907
908 switch (vpd->device_identifier_code_set) {
909 case 0x01: /* Binary */
703d641d
DC		 910 snprintf(buf, sizeof(buf),
911 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 912 &vpd->device_identifier[0]);
913 break;
914 case 0x02: /* ASCII */
703d641d
DC		 915 snprintf(buf, sizeof(buf),
916 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 917 &vpd->device_identifier[0]);
918 break;
919 case 0x03: /* UTF-8 */
703d641d
DC		 920 snprintf(buf, sizeof(buf),
921 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 922 &vpd->device_identifier[0]);
923 break;
924 default:
925 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
926 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 927 ret = -EINVAL;
c66ac9db
NB		 928 break;
929 }
930
931 if (p_buf)
932 strncpy(p_buf, buf, p_buf_len);
933 else
6708bb27 934 pr_debug("%s", buf);
c66ac9db
NB		 935
936 return ret;
937}
938
939int
940transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
941{
942 static const char hex_str[] = "0123456789abcdef";
35d1efe8 943 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 944
945 /*
946 * The VPD Code Set (encoding)
947 *
948 * from spc3r23.pdf Section 7.6.3.1 Table 296
949 */
950 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
951 switch (vpd->device_identifier_code_set) {
952 case 0x01: /* Binary */
953 vpd->device_identifier[j++] =
954 hex_str[vpd->device_identifier_type];
955 while (i < (4 + page_83[3])) {
956 vpd->device_identifier[j++] =
957 hex_str[(page_83[i] & 0xf0) >> 4];
958 vpd->device_identifier[j++] =
959 hex_str[page_83[i] & 0x0f];
960 i++;
961 }
962 break;
963 case 0x02: /* ASCII */
964 case 0x03: /* UTF-8 */
965 while (i < (4 + page_83[3]))
966 vpd->device_identifier[j++] = page_83[i++];
967 break;
968 default:
969 break;
970 }
971
972 return transport_dump_vpd_ident(vpd, NULL, 0);
973}
974EXPORT_SYMBOL(transport_set_vpd_ident);
975
de103c93
CH		 976sense_reason_t
977target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 978{
979 struct se_device *dev = cmd->se_dev;
980
981 if (cmd->unknown_data_length) {
982 cmd->data_length = size;
983 } else if (size != cmd->data_length) {
984 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
985 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
986 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
987 cmd->data_length, size, cmd->t_task_cdb[0]);
988
9b3b8041
CH		 989 if (cmd->data_direction == DMA_TO_DEVICE) {
990 pr_err("Rejecting underflow/overflow"
991 " WRITE data\n");
de103c93 992 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 993 }
994 /*
995 * Reject READ_* or WRITE_* with overflow/underflow for
996 * type SCF_SCSI_DATA_CDB.
997 */
0fd97ccf 998 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 999 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1000 " CDB on non 512-byte sector setup subsystem"
1001 " plugin: %s\n", dev->transport->name);
1002 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1003 return TCM_INVALID_CDB_FIELD;
9b3b8041 1004 }
4c054ba6
NB		 1005 /*
1006 * For the overflow case keep the existing fabric provided
1007 * ->data_length. Otherwise for the underflow case, reset
1008 * ->data_length to the smaller SCSI expected data transfer
1009 * length.
1010 */
9b3b8041
CH		 1011 if (size > cmd->data_length) {
1012 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1013 cmd->residual_count = (size - cmd->data_length);
1014 } else {
1015 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1016 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1017 cmd->data_length = size;
9b3b8041 1018 }
9b3b8041
CH		 1019 }
1020
1021 return 0;
1022
9b3b8041
CH		 1023}
1024
c66ac9db
NB		 1025/*
1026 * Used by fabric modules containing a local struct se_cmd within their
1027 * fabric dependent per I/O descriptor.
1028 */
1029void transport_init_se_cmd(
1030 struct se_cmd *cmd,
1031 struct target_core_fabric_ops *tfo,
1032 struct se_session *se_sess,
1033 u32 data_length,
1034 int data_direction,
1035 int task_attr,
1036 unsigned char *sense_buffer)
1037{
5951146d
AG		 1038 INIT_LIST_HEAD(&cmd->se_lun_node);
1039 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1040 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1041 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1042 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1043 init_completion(&cmd->transport_lun_fe_stop_comp);
1044 init_completion(&cmd->transport_lun_stop_comp);
1045 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1046 init_completion(&cmd->cmd_wait_comp);
cf572a96 1047 init_completion(&cmd->task_stop_comp);
a1d8b49a 1048 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1049 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1050
1051 cmd->se_tfo = tfo;
1052 cmd->se_sess = se_sess;
1053 cmd->data_length = data_length;
1054 cmd->data_direction = data_direction;
1055 cmd->sam_task_attr = task_attr;
1056 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1057
1058 cmd->state_active = false;
c66ac9db
NB		 1059}
1060EXPORT_SYMBOL(transport_init_se_cmd);
1061
de103c93
CH		 1062static sense_reason_t
1063transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1064{
019c4ca6
CH		 1065 struct se_device *dev = cmd->se_dev;
1066
c66ac9db
NB		 1067 /*
1068 * Check if SAM Task Attribute emulation is enabled for this
1069 * struct se_device storage object
1070 */
019c4ca6 1071 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1072 return 0;
1073
e66ecd50 1074 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1075 pr_debug("SAM Task Attribute ACA"
c66ac9db 1076 " emulation is not supported\n");
de103c93 1077 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1078 }
1079 /*
1080 * Used to determine when ORDERED commands should go from
1081 * Dormant to Active status.
1082 */
019c4ca6 1083 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1084 smp_mb__after_atomic_inc();
6708bb27 1085 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1086 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1087 dev->transport->name);
c66ac9db
NB		 1088 return 0;
1089}
1090
de103c93
CH		 1091sense_reason_t
1092target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1093{
0fd97ccf 1094 struct se_device *dev = cmd->se_dev;
cb4f4d3c 1095 unsigned long flags;
de103c93 1096 sense_reason_t ret;
c66ac9db 1097
c66ac9db
NB		 1098 /*
1099 * Ensure that the received CDB is less than the max (252 + 8) bytes
1100 * for VARIABLE_LENGTH_CMD
1101 */
1102 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1103 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1104 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1105 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1106 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1107 }
1108 /*
1109 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1110 * allocate the additional extended CDB buffer now.. Otherwise
1111 * setup the pointer from __t_task_cdb to t_task_cdb.
1112 */
a1d8b49a
AG		 1113 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1114 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1115 GFP_KERNEL);
6708bb27
AG		 1116 if (!cmd->t_task_cdb) {
1117 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1118 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1119 scsi_command_size(cdb),
a1d8b49a 1120 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1121 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1122 }
1123 } else
a1d8b49a 1124 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1125 /*
a1d8b49a 1126 * Copy the original CDB into cmd->
c66ac9db 1127 */
a1d8b49a 1128 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1129
1130 /*
1131 * Check for an existing UNIT ATTENTION condition
1132 */
de103c93
CH		 1133 ret = target_scsi3_ua_check(cmd);
1134 if (ret)
1135 return ret;
cb4f4d3c 1136
c87fbd56 1137 ret = target_alua_state_check(cmd);
de103c93
CH		 1138 if (ret)
1139 return ret;
cb4f4d3c 1140
d977f437 1141 ret = target_check_reservation(cmd);
de103c93 1142 if (ret)
d977f437 1143 return ret;
cb4f4d3c 1144
0fd97ccf 1145 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1146 if (ret)
1147 return ret;
1148
1149 ret = transport_check_alloc_task_attr(cmd);
1150 if (ret)
c66ac9db 1151 return ret;
cb4f4d3c
CH		 1152
1153 spin_lock_irqsave(&cmd->t_state_lock, flags);
1154 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1155 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1156
c66ac9db
NB		 1157 spin_lock(&cmd->se_lun->lun_sep_lock);
1158 if (cmd->se_lun->lun_sep)
1159 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1160 spin_unlock(&cmd->se_lun->lun_sep_lock);
1161 return 0;
1162}
a12f41f8 1163EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1164
695434e1
NB		 1165/*
1166 * Used by fabric module frontends to queue tasks directly.
1167 * Many only be used from process context only
1168 */
1169int transport_handle_cdb_direct(
1170 struct se_cmd *cmd)
1171{
de103c93 1172 sense_reason_t ret;
dd8ae59d 1173
695434e1
NB		 1174 if (!cmd->se_lun) {
1175 dump_stack();
6708bb27 1176 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1177 return -EINVAL;
1178 }
1179 if (in_interrupt()) {
1180 dump_stack();
6708bb27 1181 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1182 " from interrupt context\n");
1183 return -EINVAL;
1184 }
dd8ae59d 1185 /*
af877292
CH		 1186 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1187 * outstanding descriptors are handled correctly during shutdown via
1188 * transport_wait_for_tasks()
dd8ae59d
NB		 1189 *
1190 * Also, we don't take cmd->t_state_lock here as we only expect
1191 * this to be called for initial descriptor submission.
1192 */
1193 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1194 cmd->transport_state |= CMD_T_ACTIVE;
1195
dd8ae59d
NB		 1196 /*
1197 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1198 * so follow TRANSPORT_NEW_CMD processing thread context usage
1199 * and call transport_generic_request_failure() if necessary..
1200 */
1201 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1202 if (ret)
1203 transport_generic_request_failure(cmd, ret);
dd8ae59d 1204 return 0;
695434e1
NB		 1205}
1206EXPORT_SYMBOL(transport_handle_cdb_direct);
1207
de103c93
CH		 1208static sense_reason_t
1209transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1210 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1211{
1212 if (!sgl || !sgl_count)
1213 return 0;
1214
1215 /*
1216 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1217 * scatterlists already have been set to follow what the fabric
1218 * passes for the original expected data transfer length.
1219 */
1220 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1221 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1222 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1223 return TCM_INVALID_CDB_FIELD;
1224 }
1225
1226 cmd->t_data_sg = sgl;
1227 cmd->t_data_nents = sgl_count;
1228
1229 if (sgl_bidi && sgl_bidi_count) {
1230 cmd->t_bidi_data_sg = sgl_bidi;
1231 cmd->t_bidi_data_nents = sgl_bidi_count;
1232 }
1233 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1234 return 0;
1235}
1236
a026757f
NB		 1237/*
1238 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1239 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1240 *
1241 * @se_cmd: command descriptor to submit
1242 * @se_sess: associated se_sess for endpoint
1243 * @cdb: pointer to SCSI CDB
1244 * @sense: pointer to SCSI sense buffer
1245 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1246 * @data_length: fabric expected data transfer length
1247 * @task_addr: SAM task attribute
1248 * @data_dir: DMA data direction
1249 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1250 * @sgl: struct scatterlist memory for unidirectional mapping
1251 * @sgl_count: scatterlist count for unidirectional mapping
1252 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1253 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1254 *
d6dfc868
RD		 1255 * Returns non zero to signal active I/O shutdown failure. All other
1256 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1257 * but still return zero here.
1258 *
a6360785
NB		 1259 * This may only be called from process context, and also currently
1260 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1261 */
1262int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1263 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1264 u32 data_length, int task_attr, int data_dir, int flags,
1265 struct scatterlist *sgl, u32 sgl_count,
1266 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1267{
1268 struct se_portal_group *se_tpg;
de103c93
CH		 1269 sense_reason_t rc;
1270 int ret;
a6360785
NB		 1271
1272 se_tpg = se_sess->se_tpg;
1273 BUG_ON(!se_tpg);
1274 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1275 BUG_ON(in_interrupt());
1276 /*
1277 * Initialize se_cmd for target operation. From this point
1278 * exceptions are handled by sending exception status via
1279 * target_core_fabric_ops->queue_status() callback
1280 */
1281 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1282 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1283 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1284 se_cmd->unknown_data_length = 1;
a6360785
NB		 1285 /*
1286 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1287 * se_sess->sess_cmd_list. A second kref_get here is necessary
1288 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1289 * kref_put() to happen during fabric packet acknowledgement.
1290 */
de103c93
CH		 1291 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1292 if (ret)
1293 return ret;
a6360785
NB		 1294 /*
1295 * Signal bidirectional data payloads to target-core
1296 */
1297 if (flags & TARGET_SCF_BIDI_OP)
1298 se_cmd->se_cmd_flags |= SCF_BIDI;
1299 /*
1300 * Locate se_lun pointer and attach it to struct se_cmd
1301 */
de103c93
CH		 1302 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1303 if (rc) {
1304 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1305 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1306 return 0;
735703ca 1307 }
d6e0175c 1308
a12f41f8 1309 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1310 if (rc != 0) {
de103c93 1311 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1312 return 0;
735703ca 1313 }
a026757f
NB		 1314 /*
1315 * When a non zero sgl_count has been passed perform SGL passthrough
1316 * mapping for pre-allocated fabric memory instead of having target
1317 * core perform an internal SGL allocation..
1318 */
1319 if (sgl_count != 0) {
1320 BUG_ON(!sgl);
1321
944981c7
NB		 1322 /*
1323 * A work-around for tcm_loop as some userspace code via
1324 * scsi-generic do not memset their associated read buffers,
1325 * so go ahead and do that here for type non-data CDBs. Also
1326 * note that this is currently guaranteed to be a single SGL
1327 * for this case by target core in target_setup_cmd_from_cdb()
1328 * -> transport_generic_cmd_sequencer().
1329 */
1330 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1331 se_cmd->data_direction == DMA_FROM_DEVICE) {
1332 unsigned char *buf = NULL;
1333
1334 if (sgl)
1335 buf = kmap(sg_page(sgl)) + sgl->offset;
1336
1337 if (buf) {
1338 memset(buf, 0, sgl->length);
1339 kunmap(sg_page(sgl));
1340 }
1341 }
1342
a026757f
NB		 1343 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1344 sgl_bidi, sgl_bidi_count);
1345 if (rc != 0) {
de103c93 1346 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1347 return 0;
1348 }
1349 }
11e319ed
AG		 1350 /*
1351 * Check if we need to delay processing because of ALUA
1352 * Active/NonOptimized primary access state..
1353 */
1354 core_alua_check_nonop_delay(se_cmd);
1355
a6360785 1356 transport_handle_cdb_direct(se_cmd);
d6dfc868 1357 return 0;
a6360785 1358}
a026757f
NB		 1359EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1360
1361/*
1362 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1363 *
1364 * @se_cmd: command descriptor to submit
1365 * @se_sess: associated se_sess for endpoint
1366 * @cdb: pointer to SCSI CDB
1367 * @sense: pointer to SCSI sense buffer
1368 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1369 * @data_length: fabric expected data transfer length
1370 * @task_addr: SAM task attribute
1371 * @data_dir: DMA data direction
1372 * @flags: flags for command submission from target_sc_flags_tables
1373 *
1374 * Returns non zero to signal active I/O shutdown failure. All other
1375 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1376 * but still return zero here.
1377 *
1378 * This may only be called from process context, and also currently
1379 * assumes internal allocation of fabric payload buffer by target-core.
1380 *
1381 * It also assumes interal target core SGL memory allocation.
1382 */
1383int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1384 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1385 u32 data_length, int task_attr, int data_dir, int flags)
1386{
1387 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1388 unpacked_lun, data_length, task_attr, data_dir,
1389 flags, NULL, 0, NULL, 0);
1390}
a6360785
NB		 1391EXPORT_SYMBOL(target_submit_cmd);
1392
9f0d05c2
NB		 1393static void target_complete_tmr_failure(struct work_struct *work)
1394{
1395 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1396
1397 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1398 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1399
1400 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1401}
1402
ea98d7f9
AG		 1403/**
1404 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1405 * for TMR CDBs
1406 *
1407 * @se_cmd: command descriptor to submit
1408 * @se_sess: associated se_sess for endpoint
1409 * @sense: pointer to SCSI sense buffer
1410 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1411 * @fabric_context: fabric context for TMR req
1412 * @tm_type: Type of TM request
c0974f89
NB		 1413 * @gfp: gfp type for caller
1414 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1415 * @flags: submit cmd flags
ea98d7f9
AG		 1416 *
1417 * Callable from all contexts.
1418 **/
1419
c7042cae 1420int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1421 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1422 void *fabric_tmr_ptr, unsigned char tm_type,
1423 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1424{
1425 struct se_portal_group *se_tpg;
1426 int ret;
1427
1428 se_tpg = se_sess->se_tpg;
1429 BUG_ON(!se_tpg);
1430
1431 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1432 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1433 /*
1434 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1435 * allocation failure.
1436 */
c0974f89 1437 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1438 if (ret < 0)
1439 return -ENOMEM;
ea98d7f9 1440
c0974f89
NB		 1441 if (tm_type == TMR_ABORT_TASK)
1442 se_cmd->se_tmr_req->ref_task_tag = tag;
1443
ea98d7f9 1444 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1445 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1446 if (ret) {
1447 core_tmr_release_req(se_cmd->se_tmr_req);
1448 return ret;
1449 }
ea98d7f9 1450
ea98d7f9
AG		 1451 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1452 if (ret) {
9f0d05c2
NB		 1453 /*
1454 * For callback during failure handling, push this work off
1455 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1456 */
1457 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1458 schedule_work(&se_cmd->work);
c7042cae 1459 return 0;
ea98d7f9
AG		 1460 }
1461 transport_generic_handle_tmr(se_cmd);
c7042cae 1462 return 0;
ea98d7f9
AG		 1463}
1464EXPORT_SYMBOL(target_submit_tmr);
1465
cdbb70bb 1466/*
cf572a96 1467 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1468 * has completed.
1469 */
cf572a96 1470bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1471{
cdbb70bb
CH		 1472 bool was_active = false;
1473
cf572a96
CH		 1474 if (cmd->transport_state & CMD_T_BUSY) {
1475 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1476 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1477
cf572a96
CH		 1478 pr_debug("cmd %p waiting to complete\n", cmd);
1479 wait_for_completion(&cmd->task_stop_comp);
1480 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1481
1482 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1483 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1484 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1485 was_active = true;
1486 }
1487
cdbb70bb
CH		 1488 return was_active;
1489}
1490
c66ac9db
NB		 1491/*
1492 * Handle SAM-esque emulation for generic transport request failures.
1493 */
de103c93
CH		 1494void transport_generic_request_failure(struct se_cmd *cmd,
1495 sense_reason_t sense_reason)
c66ac9db 1496{
07bde79a
NB		 1497 int ret = 0;
1498
6708bb27 1499 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1500 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1501 cmd->t_task_cdb[0]);
de103c93 1502 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1503 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1504 cmd->t_state, sense_reason);
d43d6aea 1505 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1506 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1507 (cmd->transport_state & CMD_T_STOP) != 0,
1508 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1509
c66ac9db
NB		 1510 /*
1511 * For SAM Task Attribute emulation for failed struct se_cmd
1512 */
019c4ca6 1513 transport_complete_task_attr(cmd);
c66ac9db 1514
de103c93 1515 switch (sense_reason) {
03e98c9e
NB		 1516 case TCM_NON_EXISTENT_LUN:
1517 case TCM_UNSUPPORTED_SCSI_OPCODE:
1518 case TCM_INVALID_CDB_FIELD:
1519 case TCM_INVALID_PARAMETER_LIST:
1520 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1521 case TCM_UNKNOWN_MODE_PAGE:
1522 case TCM_WRITE_PROTECTED:
e2397c70 1523 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1524 case TCM_CHECK_CONDITION_ABORT_CMD:
1525 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1526 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1527 break;
de103c93
CH		 1528 case TCM_OUT_OF_RESOURCES:
1529 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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",
de103c93
CH		 1558 cmd->t_task_cdb[0], sense_reason);
1559 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1560 break;
1561 }
f3146437 1562
de103c93 1563 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1564 if (ret == -EAGAIN || ret == -ENOMEM)
1565 goto queue_full;
07bde79a 1566
c66ac9db
NB		 1567check_stop:
1568 transport_lun_remove_cmd(cmd);
6708bb27 1569 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1570 ;
07bde79a
NB		 1571 return;
1572
1573queue_full:
e057f533
CH		 1574 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1575 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1576}
2fbff127 1577EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1578
5f41a31d 1579static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1580{
de103c93 1581 sense_reason_t ret;
5f41a31d
CH		 1582
1583 spin_lock_irq(&cmd->t_state_lock);
1584 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1585 spin_unlock_irq(&cmd->t_state_lock);
1586
de103c93
CH		 1587 if (cmd->execute_cmd) {
1588 ret = cmd->execute_cmd(cmd);
1589 if (ret) {
1590 spin_lock_irq(&cmd->t_state_lock);
1591 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1592 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1593
de103c93
CH		 1594 transport_generic_request_failure(cmd, ret);
1595 }
5f41a31d
CH		 1596 }
1597}
1598
019c4ca6 1599static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1600{
1601 struct se_device *dev = cmd->se_dev;
1602
019c4ca6
CH		 1603 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1604 return false;
5f41a31d 1605
c66ac9db 1606 /*
25985edc 1607 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1608 * to allow the passed struct se_cmd list of tasks to the front of the list.
1609 */
5f41a31d
CH		 1610 switch (cmd->sam_task_attr) {
1611 case MSG_HEAD_TAG:
1612 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1613 "se_ordered_id: %u\n",
1614 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1615 return false;
5f41a31d
CH		 1616 case MSG_ORDERED_TAG:
1617 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1618 smp_mb__after_atomic_inc();
1619
5f41a31d
CH		 1620 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1621 " se_ordered_id: %u\n",
1622 cmd->t_task_cdb[0], cmd->se_ordered_id);
1623
c66ac9db 1624 /*
5f41a31d
CH		 1625 * Execute an ORDERED command if no other older commands
1626 * exist that need to be completed first.
c66ac9db 1627 */
5f41a31d 1628 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1629 return false;
5f41a31d
CH		 1630 break;
1631 default:
c66ac9db
NB		 1632 /*
1633 * For SIMPLE and UNTAGGED Task Attribute commands
1634 */
5f41a31d 1635 atomic_inc(&dev->simple_cmds);
c66ac9db 1636 smp_mb__after_atomic_inc();
5f41a31d 1637 break;
c66ac9db 1638 }
5f41a31d 1639
019c4ca6
CH		 1640 if (atomic_read(&dev->dev_ordered_sync) == 0)
1641 return false;
c66ac9db 1642
019c4ca6
CH		 1643 spin_lock(&dev->delayed_cmd_lock);
1644 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1645 spin_unlock(&dev->delayed_cmd_lock);
1646
1647 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1648 " delayed CMD list, se_ordered_id: %u\n",
1649 cmd->t_task_cdb[0], cmd->sam_task_attr,
1650 cmd->se_ordered_id);
1651 return true;
1652}
1653
1654void target_execute_cmd(struct se_cmd *cmd)
1655{
1656 /*
1657 * If the received CDB has aleady been aborted stop processing it here.
1658 */
5bd665f2
LT		 1659 if (transport_check_aborted_status(cmd, 1)) {
1660 complete(&cmd->transport_lun_stop_comp);
5f41a31d 1661 return;
c66ac9db 1662 }
c66ac9db 1663
c66ac9db 1664 /*
019c4ca6
CH		 1665 * Determine if IOCTL context caller in requesting the stopping of this
1666 * command for LUN shutdown purposes.
c66ac9db 1667 */
019c4ca6
CH		 1668 spin_lock_irq(&cmd->t_state_lock);
1669 if (cmd->transport_state & CMD_T_LUN_STOP) {
1670 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1671 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1672
1673 cmd->transport_state &= ~CMD_T_ACTIVE;
1674 spin_unlock_irq(&cmd->t_state_lock);
1675 complete(&cmd->transport_lun_stop_comp);
1676 return;
1677 }
1678 /*
1679 * Determine if frontend context caller is requesting the stopping of
1680 * this command for frontend exceptions.
1681 */
1682 if (cmd->transport_state & CMD_T_STOP) {
1683 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1684 __func__, __LINE__,
1685 cmd->se_tfo->get_task_tag(cmd));
1686
1687 spin_unlock_irq(&cmd->t_state_lock);
1688 complete(&cmd->t_transport_stop_comp);
1689 return;
1690 }
1691
1692 cmd->t_state = TRANSPORT_PROCESSING;
e627c615 1693 cmd->transport_state |= CMD_T_ACTIVE;
019c4ca6
CH		 1694 spin_unlock_irq(&cmd->t_state_lock);
1695
1696 if (!target_handle_task_attr(cmd))
1697 __target_execute_cmd(cmd);
c66ac9db 1698}
70baf0ab 1699EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1700
5f41a31d
CH		 1701/*
1702 * Process all commands up to the last received ORDERED task attribute which
1703 * requires another blocking boundary
1704 */
1705static void target_restart_delayed_cmds(struct se_device *dev)
1706{
1707 for (;;) {
1708 struct se_cmd *cmd;
1709
1710 spin_lock(&dev->delayed_cmd_lock);
1711 if (list_empty(&dev->delayed_cmd_list)) {
1712 spin_unlock(&dev->delayed_cmd_lock);
1713 break;
1714 }
1715
1716 cmd = list_entry(dev->delayed_cmd_list.next,
1717 struct se_cmd, se_delayed_node);
1718 list_del(&cmd->se_delayed_node);
1719 spin_unlock(&dev->delayed_cmd_lock);
1720
1721 __target_execute_cmd(cmd);
1722
1723 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1724 break;
1725 }
1726}
1727
c66ac9db 1728/*
35e0e757 1729 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1730 * and ordered cmds need to have their tasks added to the execution queue.
1731 */
1732static void transport_complete_task_attr(struct se_cmd *cmd)
1733{
5951146d 1734 struct se_device *dev = cmd->se_dev;
c66ac9db 1735
019c4ca6
CH		 1736 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1737 return;
1738
e66ecd50 1739 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1740 atomic_dec(&dev->simple_cmds);
1741 smp_mb__after_atomic_dec();
1742 dev->dev_cur_ordered_id++;
6708bb27 1743 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1744 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1745 cmd->se_ordered_id);
e66ecd50 1746 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1747 dev->dev_cur_ordered_id++;
6708bb27 1748 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1749 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1750 cmd->se_ordered_id);
e66ecd50 1751 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1752 atomic_dec(&dev->dev_ordered_sync);
1753 smp_mb__after_atomic_dec();
c66ac9db
NB		 1754
1755 dev->dev_cur_ordered_id++;
6708bb27 1756 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1757 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1758 }
c66ac9db 1759
5f41a31d 1760 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1761}
1762
e057f533 1763static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1764{
1765 int ret = 0;
1766
019c4ca6 1767 transport_complete_task_attr(cmd);
e057f533
CH		 1768
1769 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1770 ret = cmd->se_tfo->queue_status(cmd);
1771 if (ret)
1772 goto out;
1773 }
07bde79a
NB		 1774
1775 switch (cmd->data_direction) {
1776 case DMA_FROM_DEVICE:
1777 ret = cmd->se_tfo->queue_data_in(cmd);
1778 break;
1779 case DMA_TO_DEVICE:
ec98f782 1780 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 1781 ret = cmd->se_tfo->queue_data_in(cmd);
1782 if (ret < 0)
e057f533 1783 break;
07bde79a
NB		 1784 }
1785 /* Fall through for DMA_TO_DEVICE */
1786 case DMA_NONE:
1787 ret = cmd->se_tfo->queue_status(cmd);
1788 break;
1789 default:
1790 break;
1791 }
1792
e057f533
CH		 1793out:
1794 if (ret < 0) {
1795 transport_handle_queue_full(cmd, cmd->se_dev);
1796 return;
1797 }
1798 transport_lun_remove_cmd(cmd);
1799 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1800}
1801
1802static void transport_handle_queue_full(
1803 struct se_cmd *cmd,
e057f533 1804 struct se_device *dev)
07bde79a
NB		 1805{
1806 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1807 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1808 atomic_inc(&dev->dev_qf_count);
1809 smp_mb__after_atomic_inc();
1810 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1811
1812 schedule_work(&cmd->se_dev->qf_work_queue);
1813}
1814
35e0e757 1815static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1816{
35e0e757 1817 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1818 int ret;
35e0e757 1819
c66ac9db
NB		 1820 /*
1821 * Check if we need to move delayed/dormant tasks from cmds on the
1822 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1823 * Attribute.
1824 */
019c4ca6
CH		 1825 transport_complete_task_attr(cmd);
1826
07bde79a
NB		 1827 /*
1828 * Check to schedule QUEUE_FULL work, or execute an existing
1829 * cmd->transport_qf_callback()
1830 */
1831 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1832 schedule_work(&cmd->se_dev->qf_work_queue);
1833
c66ac9db 1834 /*
d5829eac 1835 * Check if we need to send a sense buffer from
c66ac9db
NB		 1836 * the struct se_cmd in question.
1837 */
1838 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1839 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1840 ret = transport_send_check_condition_and_sense(
1841 cmd, 0, 1);
1842 if (ret == -EAGAIN || ret == -ENOMEM)
1843 goto queue_full;
1844
1845 transport_lun_remove_cmd(cmd);
1846 transport_cmd_check_stop_to_fabric(cmd);
1847 return;
c66ac9db
NB		 1848 }
1849 /*
25985edc 1850 * Check for a callback, used by amongst other things
c66ac9db
NB		 1851 * XDWRITE_READ_10 emulation.
1852 */
1853 if (cmd->transport_complete_callback)
1854 cmd->transport_complete_callback(cmd);
1855
1856 switch (cmd->data_direction) {
1857 case DMA_FROM_DEVICE:
1858 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1859 if (cmd->se_lun->lun_sep) {
1860 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1861 cmd->data_length;
1862 }
1863 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1864
07bde79a 1865 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1866 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1867 goto queue_full;
c66ac9db
NB		 1868 break;
1869 case DMA_TO_DEVICE:
1870 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1871 if (cmd->se_lun->lun_sep) {
1872 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1873 cmd->data_length;
1874 }
1875 spin_unlock(&cmd->se_lun->lun_sep_lock);
1876 /*
1877 * Check if we need to send READ payload for BIDI-COMMAND
1878 */
ec98f782 1879 if (cmd->t_bidi_data_sg) {
c66ac9db 1880 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1881 if (cmd->se_lun->lun_sep) {
1882 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1883 cmd->data_length;
1884 }
1885 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1886 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1887 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1888 goto queue_full;
c66ac9db
NB		 1889 break;
1890 }
1891 /* Fall through for DMA_TO_DEVICE */
1892 case DMA_NONE:
07bde79a 1893 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1894 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1895 goto queue_full;
c66ac9db
NB		 1896 break;
1897 default:
1898 break;
1899 }
1900
1901 transport_lun_remove_cmd(cmd);
1902 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1903 return;
1904
1905queue_full:
6708bb27 1906 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1907 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1908 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1909 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1910}
1911
6708bb27 1912static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 1913{
ec98f782 1914 struct scatterlist *sg;
ec98f782 1915 int count;
c66ac9db 1916
6708bb27
AG		 1917 for_each_sg(sgl, sg, nents, count)
1918 __free_page(sg_page(sg));
c66ac9db 1919
6708bb27
AG		 1920 kfree(sgl);
1921}
c66ac9db 1922
6708bb27
AG		 1923static inline void transport_free_pages(struct se_cmd *cmd)
1924{
1925 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
1926 return;
1927
1928 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 1929 cmd->t_data_sg = NULL;
1930 cmd->t_data_nents = 0;
c66ac9db 1931
6708bb27 1932 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 1933 cmd->t_bidi_data_sg = NULL;
1934 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 1935}
1936
e26d99ae
CH		 1937/**
1938 * transport_release_cmd - free a command
1939 * @cmd: command to free
1940 *
1941 * This routine unconditionally frees a command, and reference counting
1942 * or list removal must be done in the caller.
1943 */
1944static void transport_release_cmd(struct se_cmd *cmd)
1945{
1946 BUG_ON(!cmd->se_tfo);
1947
c8e31f26 1948 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 1949 core_tmr_release_req(cmd->se_tmr_req);
1950 if (cmd->t_task_cdb != cmd->__t_task_cdb)
1951 kfree(cmd->t_task_cdb);
1952 /*
7481deb4
NB		 1953 * If this cmd has been setup with target_get_sess_cmd(), drop
1954 * the kref and call ->release_cmd() in kref callback.
e26d99ae 1955 */
7481deb4
NB		 1956 if (cmd->check_release != 0) {
1957 target_put_sess_cmd(cmd->se_sess, cmd);
1958 return;
1959 }
e26d99ae
CH		 1960 cmd->se_tfo->release_cmd(cmd);
1961}
1962
d3df7825
CH		 1963/**
1964 * transport_put_cmd - release a reference to a command
1965 * @cmd: command to release
1966 *
1967 * This routine releases our reference to the command and frees it if possible.
1968 */
39c05f32 1969static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 1970{
1971 unsigned long flags;
c66ac9db 1972
a1d8b49a 1973 spin_lock_irqsave(&cmd->t_state_lock, flags);
d9ed6947
RD		 1974 if (atomic_read(&cmd->t_fe_count) &&
1975 !atomic_dec_and_test(&cmd->t_fe_count)) {
1976 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1977 return;
4911e3cc
CH		 1978 }
1979
7d680f3b
CH		 1980 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
1981 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 1982 target_remove_from_state_list(cmd);
c66ac9db 1983 }
a1d8b49a 1984 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 1985
c66ac9db 1986 transport_free_pages(cmd);
31afc39c 1987 transport_release_cmd(cmd);
39c05f32 1988 return;
c66ac9db 1989}
c66ac9db 1990
4949314c 1991void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 1992{
ec98f782 1993 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 1994 struct page **pages;
1995 int i;
05d1c7c0
AG		 1996
1997 /*
ec98f782
AG		 1998 * We need to take into account a possible offset here for fabrics like
1999 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2000 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2001 */
4949314c
AG		 2002 if (!cmd->t_data_nents)
2003 return NULL;
3717ef0c
PB		 2004
2005 BUG_ON(!sg);
2006 if (cmd->t_data_nents == 1)
4949314c
AG		 2007 return kmap(sg_page(sg)) + sg->offset;
2008
2009 /* >1 page. use vmap */
2010 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2011 if (!pages)
4949314c
AG		 2012 return NULL;
2013
2014 /* convert sg[] to pages[] */
2015 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2016 pages[i] = sg_page(sg);
2017 }
2018
2019 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2020 kfree(pages);
de103c93 2021 if (!cmd->t_data_vmap)
4949314c
AG		 2022 return NULL;
2023
2024 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2025}
4949314c 2026EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2027
4949314c 2028void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2029{
a1edf9cf 2030 if (!cmd->t_data_nents) {
4949314c 2031 return;
a1edf9cf 2032 } else if (cmd->t_data_nents == 1) {
4949314c 2033 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2034 return;
2035 }
4949314c
AG		 2036
2037 vunmap(cmd->t_data_vmap);
2038 cmd->t_data_vmap = NULL;
05d1c7c0 2039}
4949314c 2040EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2041
c66ac9db 2042static int
05d1c7c0 2043transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2044{
ec98f782
AG		 2045 u32 length = cmd->data_length;
2046 unsigned int nents;
2047 struct page *page;
9db9da33 2048 gfp_t zero_flag;
ec98f782 2049 int i = 0;
c66ac9db 2050
ec98f782
AG		 2051 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2052 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2053 if (!cmd->t_data_sg)
2054 return -ENOMEM;
c66ac9db 2055
ec98f782
AG		 2056 cmd->t_data_nents = nents;
2057 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2058
64f1db38 2059 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2060
ec98f782
AG		 2061 while (length) {
2062 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2063 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2064 if (!page)
2065 goto out;
c66ac9db 2066
ec98f782
AG		 2067 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2068 length -= page_len;
2069 i++;
c66ac9db 2070 }
c66ac9db 2071 return 0;
c66ac9db 2072
ec98f782 2073out:
d0e27c88 2074 while (i > 0) {
ec98f782 2075 i--;
d0e27c88 2076 __free_page(sg_page(&cmd->t_data_sg[i]));
c66ac9db 2077 }
ec98f782
AG		 2078 kfree(cmd->t_data_sg);
2079 cmd->t_data_sg = NULL;
2080 return -ENOMEM;
c66ac9db
NB		 2081}
2082
da0f7619 2083/*
b16a35b0
AG		 2084 * Allocate any required resources to execute the command. For writes we
2085 * might not have the payload yet, so notify the fabric via a call to
2086 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2087 */
de103c93
CH		 2088sense_reason_t
2089transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2090{
c66ac9db
NB		 2091 int ret = 0;
2092
2093 /*
2094 * Determine is the TCM fabric module has already allocated physical
2095 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2096 * beforehand.
c66ac9db 2097 */
ec98f782
AG		 2098 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2099 cmd->data_length) {
05d1c7c0 2100 ret = transport_generic_get_mem(cmd);
c66ac9db 2101 if (ret < 0)
de103c93 2102 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2103 }
da0f7619 2104
4101f0a8 2105 atomic_inc(&cmd->t_fe_count);
4101f0a8 2106
c66ac9db 2107 /*
c3196f0c
CH		 2108 * If this command is not a write we can execute it right here,
2109 * for write buffers we need to notify the fabric driver first
2110 * and let it call back once the write buffers are ready.
c66ac9db 2111 */
5f41a31d 2112 target_add_to_state_list(cmd);
c3196f0c
CH		 2113 if (cmd->data_direction != DMA_TO_DEVICE) {
2114 target_execute_cmd(cmd);
2115 return 0;
2116 }
2117
2118 spin_lock_irq(&cmd->t_state_lock);
2119 cmd->t_state = TRANSPORT_WRITE_PENDING;
2120 spin_unlock_irq(&cmd->t_state_lock);
2121
2122 transport_cmd_check_stop(cmd, false);
2123
2124 ret = cmd->se_tfo->write_pending(cmd);
2125 if (ret == -EAGAIN || ret == -ENOMEM)
2126 goto queue_full;
2127
de103c93
CH		 2128 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2129 WARN_ON(ret);
2130
b69c1fcf 2131 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2132
c3196f0c
CH		 2133queue_full:
2134 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2135 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2136 transport_handle_queue_full(cmd, cmd->se_dev);
2137 return 0;
c66ac9db 2138}
a1d8b49a 2139EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2140
e057f533 2141static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2142{
f147abb4
NB		 2143 int ret;
2144
2145 ret = cmd->se_tfo->write_pending(cmd);
2146 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2147 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2148 cmd);
2149 transport_handle_queue_full(cmd, cmd->se_dev);
2150 }
07bde79a
NB		 2151}
2152
39c05f32 2153void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2154{
d14921d6 2155 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2156 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2157 transport_wait_for_tasks(cmd);
2158
35462975 2159 transport_release_cmd(cmd);
d14921d6
NB		 2160 } else {
2161 if (wait_for_tasks)
2162 transport_wait_for_tasks(cmd);
2163
c66ac9db
NB		 2164 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2165
82f1c8a4 2166 if (cmd->se_lun)
c66ac9db 2167 transport_lun_remove_cmd(cmd);
c66ac9db 2168
39c05f32 2169 transport_put_cmd(cmd);
c66ac9db
NB		 2170 }
2171}
2172EXPORT_SYMBOL(transport_generic_free_cmd);
2173
a17f091d
NB		 2174/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2175 * @se_sess: session to reference
2176 * @se_cmd: command descriptor to add
a6360785 2177 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2178 */
bc187ea6
RD		 2179static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2180 bool ack_kref)
a17f091d
NB		 2181{
2182 unsigned long flags;
bc187ea6 2183 int ret = 0;
a17f091d 2184
7481deb4 2185 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2186 /*
2187 * Add a second kref if the fabric caller is expecting to handle
2188 * fabric acknowledgement that requires two target_put_sess_cmd()
2189 * invocations before se_cmd descriptor release.
2190 */
86715569 2191 if (ack_kref == true) {
a6360785 2192 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2193 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2194 }
7481deb4 2195
a17f091d 2196 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2197 if (se_sess->sess_tearing_down) {
2198 ret = -ESHUTDOWN;
2199 goto out;
2200 }
a17f091d
NB		 2201 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2202 se_cmd->check_release = 1;
bc187ea6
RD		 2203
2204out:
a17f091d 2205 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2206 return ret;
a17f091d 2207}
a17f091d 2208
7481deb4 2209static void target_release_cmd_kref(struct kref *kref)
a17f091d 2210{
7481deb4
NB		 2211 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2212 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 2213 unsigned long flags;
2214
2215 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2216 if (list_empty(&se_cmd->se_cmd_list)) {
2217 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2218 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2219 return;
a17f091d 2220 }
a17f091d
NB		 2221 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2222 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2223 complete(&se_cmd->cmd_wait_comp);
7481deb4 2224 return;
a17f091d
NB		 2225 }
2226 list_del(&se_cmd->se_cmd_list);
2227 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2228
7481deb4
NB		 2229 se_cmd->se_tfo->release_cmd(se_cmd);
2230}
2231
2232/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2233 * @se_sess: session to reference
2234 * @se_cmd: command descriptor to drop
2235 */
2236int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2237{
2238 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2239}
2240EXPORT_SYMBOL(target_put_sess_cmd);
2241
1c7b13fe
RD		 2242/* target_sess_cmd_list_set_waiting - Flag all commands in
2243 * sess_cmd_list to complete cmd_wait_comp. Set
2244 * sess_tearing_down so no more commands are queued.
2245 * @se_sess: session to flag
a17f091d 2246 */
1c7b13fe 2247void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2248{
2249 struct se_cmd *se_cmd;
2250 unsigned long flags;
2251
a17f091d 2252 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
a17f091d 2253
1c7b13fe
RD		 2254 WARN_ON(se_sess->sess_tearing_down);
2255 se_sess->sess_tearing_down = 1;
a17f091d 2256
1c7b13fe 2257 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
a17f091d
NB		 2258 se_cmd->cmd_wait_set = 1;
2259
2260 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2261}
1c7b13fe 2262EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2263
2264/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2265 * @se_sess: session to wait for active I/O
2266 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2267 */
2268void target_wait_for_sess_cmds(
2269 struct se_session *se_sess,
2270 int wait_for_tasks)
2271{
2272 struct se_cmd *se_cmd, *tmp_cmd;
2273 bool rc = false;
2274
2275 list_for_each_entry_safe(se_cmd, tmp_cmd,
1c7b13fe 2276 &se_sess->sess_cmd_list, se_cmd_list) {
a17f091d
NB		 2277 list_del(&se_cmd->se_cmd_list);
2278
2279 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2280 " %d\n", se_cmd, se_cmd->t_state,
2281 se_cmd->se_tfo->get_cmd_state(se_cmd));
2282
2283 if (wait_for_tasks) {
2284 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2285 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2286 se_cmd->se_tfo->get_cmd_state(se_cmd));
2287
2288 rc = transport_wait_for_tasks(se_cmd);
2289
2290 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2291 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2292 se_cmd->se_tfo->get_cmd_state(se_cmd));
2293 }
2294
2295 if (!rc) {
2296 wait_for_completion(&se_cmd->cmd_wait_comp);
2297 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2298 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2299 se_cmd->se_tfo->get_cmd_state(se_cmd));
2300 }
2301
2302 se_cmd->se_tfo->release_cmd(se_cmd);
2303 }
2304}
2305EXPORT_SYMBOL(target_wait_for_sess_cmds);
2306
c66ac9db
NB		 2307/* transport_lun_wait_for_tasks():
2308 *
2309 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2310 * an struct se_lun to be successfully shutdown.
2311 */
2312static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2313{
2314 unsigned long flags;
cf572a96
CH		 2315 int ret = 0;
2316
c66ac9db
NB		 2317 /*
2318 * If the frontend has already requested this struct se_cmd to
2319 * be stopped, we can safely ignore this struct se_cmd.
2320 */
a1d8b49a 2321 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2322 if (cmd->transport_state & CMD_T_STOP) {
2323 cmd->transport_state &= ~CMD_T_LUN_STOP;
2324
2325 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2326 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2327 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2328 transport_cmd_check_stop(cmd, false);
e3d6f909 2329 return -EPERM;
c66ac9db 2330 }
7d680f3b 2331 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2332 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2333
cf572a96
CH		 2334 // XXX: audit task_flags checks.
2335 spin_lock_irqsave(&cmd->t_state_lock, flags);
2336 if ((cmd->transport_state & CMD_T_BUSY) &&
2337 (cmd->transport_state & CMD_T_SENT)) {
2338 if (!target_stop_cmd(cmd, &flags))
2339 ret++;
cf572a96 2340 }
5f41a31d 2341 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2342
785fdf70
CH		 2343 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2344 " %d\n", cmd, ret);
c66ac9db 2345 if (!ret) {
6708bb27 2346 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2347 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2348 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2349 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2350 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2351 }
c66ac9db
NB		 2352
2353 return 0;
2354}
2355
c66ac9db
NB		 2356static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2357{
2358 struct se_cmd *cmd = NULL;
2359 unsigned long lun_flags, cmd_flags;
2360 /*
2361 * Do exception processing and return CHECK_CONDITION status to the
2362 * Initiator Port.
2363 */
2364 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2365 while (!list_empty(&lun->lun_cmd_list)) {
2366 cmd = list_first_entry(&lun->lun_cmd_list,
2367 struct se_cmd, se_lun_node);
3d26fea0 2368 list_del_init(&cmd->se_lun_node);
5951146d 2369
a1d8b49a 2370 spin_lock(&cmd->t_state_lock);
6708bb27 2371 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2372 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2373 cmd->se_lun->unpacked_lun,
2374 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2375 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2376 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2377
2378 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2379
6708bb27
AG		 2380 if (!cmd->se_lun) {
2381 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2382 cmd->se_tfo->get_task_tag(cmd),
2383 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2384 BUG();
2385 }
2386 /*
2387 * If the Storage engine still owns the iscsi_cmd_t, determine
2388 * and/or stop its context.
2389 */
6708bb27 2390 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2391 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2392 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2393
e3d6f909 2394 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2395 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2396 continue;
2397 }
2398
6708bb27 2399 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2400 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2401 cmd->se_lun->unpacked_lun,
2402 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2403
a1d8b49a 2404 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2405 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2406 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2407 goto check_cond;
2408 }
7d680f3b 2409 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2410 target_remove_from_state_list(cmd);
a1d8b49a 2411 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2412
c66ac9db
NB		 2413 /*
2414 * The Storage engine stopped this struct se_cmd before it was
2415 * send to the fabric frontend for delivery back to the
2416 * Initiator Node. Return this SCSI CDB back with an
2417 * CHECK_CONDITION status.
2418 */
2419check_cond:
2420 transport_send_check_condition_and_sense(cmd,
2421 TCM_NON_EXISTENT_LUN, 0);
2422 /*
2423 * If the fabric frontend is waiting for this iscsi_cmd_t to
2424 * be released, notify the waiting thread now that LU has
2425 * finished accessing it.
2426 */
a1d8b49a 2427 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2428 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2429 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2430 " struct se_cmd: %p ITT: 0x%08x\n",
2431 lun->unpacked_lun,
e3d6f909 2432 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2433
a1d8b49a 2434 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2435 cmd_flags);
f7113a47 2436 transport_cmd_check_stop(cmd, false);
a1d8b49a 2437 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2438 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2439 continue;
2440 }
6708bb27 2441 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2442 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2443
a1d8b49a 2444 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2445 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2446 }
2447 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2448}
2449
2450static int transport_clear_lun_thread(void *p)
2451{
8359cf43 2452 struct se_lun *lun = p;
c66ac9db
NB		 2453
2454 __transport_clear_lun_from_sessions(lun);
2455 complete(&lun->lun_shutdown_comp);
2456
2457 return 0;
2458}
2459
2460int transport_clear_lun_from_sessions(struct se_lun *lun)
2461{
2462 struct task_struct *kt;
2463
5951146d 2464 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2465 "tcm_cl_%u", lun->unpacked_lun);
2466 if (IS_ERR(kt)) {
6708bb27 2467 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2468 return PTR_ERR(kt);
c66ac9db
NB		 2469 }
2470 wait_for_completion(&lun->lun_shutdown_comp);
2471
2472 return 0;
2473}
2474
d14921d6
NB		 2475/**
2476 * transport_wait_for_tasks - wait for completion to occur
2477 * @cmd: command to wait
c66ac9db 2478 *
d14921d6
NB		 2479 * Called from frontend fabric context to wait for storage engine
2480 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2481 */
a17f091d 2482bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2483{
2484 unsigned long flags;
2485
a1d8b49a 2486 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2487 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2488 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2489 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2490 return false;
d14921d6 2491 }
cb4f4d3c 2492
c8e31f26
AG		 2493 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2494 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2495 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2496 return false;
d14921d6 2497 }
c66ac9db
NB		 2498 /*
2499 * If we are already stopped due to an external event (ie: LUN shutdown)
2500 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2501 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2502 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2503 * has completed its operation on the struct se_cmd.
2504 */
7d680f3b 2505 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2506 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2507 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2508 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2509 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2510 /*
2511 * There is a special case for WRITES where a FE exception +
2512 * LUN shutdown means ConfigFS context is still sleeping on
2513 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2514 * We go ahead and up transport_lun_stop_comp just to be sure
2515 * here.
2516 */
a1d8b49a
AG		 2517 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2518 complete(&cmd->transport_lun_stop_comp);
2519 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2520 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2521
cf572a96 2522 target_remove_from_state_list(cmd);
c66ac9db
NB		 2523 /*
2524 * At this point, the frontend who was the originator of this
2525 * struct se_cmd, now owns the structure and can be released through
2526 * normal means below.
2527 */
6708bb27 2528 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2529 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2530 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2531 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2532
7d680f3b 2533 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2534 }
7d680f3b 2535
3d28934a 2536 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2537 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2538 return false;
d14921d6 2539 }
c66ac9db 2540
7d680f3b 2541 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2542
6708bb27 2543 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2544 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2545 cmd, cmd->se_tfo->get_task_tag(cmd),
2546 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2547
a1d8b49a 2548 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2549
a1d8b49a 2550 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2551
a1d8b49a 2552 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2553 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2554
35d1efe8 2555 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2556 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2557 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2558
d14921d6 2559 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2560
2561 return true;
c66ac9db 2562}
d14921d6 2563EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2564
2565static int transport_get_sense_codes(
2566 struct se_cmd *cmd,
2567 u8 *asc,
2568 u8 *ascq)
2569{
2570 *asc = cmd->scsi_asc;
2571 *ascq = cmd->scsi_ascq;
2572
2573 return 0;
2574}
2575
de103c93
CH		 2576int
2577transport_send_check_condition_and_sense(struct se_cmd *cmd,
2578 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2579{
2580 unsigned char *buffer = cmd->sense_buffer;
2581 unsigned long flags;
c66ac9db
NB		 2582 u8 asc = 0, ascq = 0;
2583
a1d8b49a 2584 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2585 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2586 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2587 return 0;
2588 }
2589 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2590 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2591
2592 if (!reason && from_transport)
2593 goto after_reason;
2594
2595 if (!from_transport)
2596 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2597
c66ac9db
NB		 2598 /*
2599 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2600 * SENSE KEY values from include/scsi/scsi.h
2601 */
2602 switch (reason) {
ba829137
HR		 2603 case TCM_NO_SENSE:
2604 /* CURRENT ERROR */
2605 buffer[0] = 0x70;
2606 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2607 /* Not Ready */
2608 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2609 /* NO ADDITIONAL SENSE INFORMATION */
2610 buffer[SPC_ASC_KEY_OFFSET] = 0;
2611 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2612 break;
c66ac9db 2613 case TCM_NON_EXISTENT_LUN:
eb39d340 2614 /* CURRENT ERROR */
9c58b7dd
RD		 2615 buffer[0] = 0x70;
2616 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2617 /* ILLEGAL REQUEST */
9c58b7dd 2618 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2619 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2620 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2621 break;
c66ac9db
NB		 2622 case TCM_UNSUPPORTED_SCSI_OPCODE:
2623 case TCM_SECTOR_COUNT_TOO_MANY:
2624 /* CURRENT ERROR */
9c58b7dd
RD		 2625 buffer[0] = 0x70;
2626 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2627 /* ILLEGAL REQUEST */
9c58b7dd 2628 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2629 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2630 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2631 break;
2632 case TCM_UNKNOWN_MODE_PAGE:
2633 /* CURRENT ERROR */
9c58b7dd
RD		 2634 buffer[0] = 0x70;
2635 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2636 /* ILLEGAL REQUEST */
9c58b7dd 2637 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2638 /* INVALID FIELD IN CDB */
9c58b7dd 2639 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2640 break;
2641 case TCM_CHECK_CONDITION_ABORT_CMD:
2642 /* CURRENT ERROR */
9c58b7dd
RD		 2643 buffer[0] = 0x70;
2644 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2645 /* ABORTED COMMAND */
9c58b7dd 2646 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2647 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2648 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2649 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2650 break;
2651 case TCM_INCORRECT_AMOUNT_OF_DATA:
2652 /* CURRENT ERROR */
9c58b7dd
RD		 2653 buffer[0] = 0x70;
2654 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2655 /* ABORTED COMMAND */
9c58b7dd 2656 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2657 /* WRITE ERROR */
9c58b7dd 2658 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2659 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2660 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2661 break;
2662 case TCM_INVALID_CDB_FIELD:
2663 /* CURRENT ERROR */
9c58b7dd
RD		 2664 buffer[0] = 0x70;
2665 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2666 /* ILLEGAL REQUEST */
9c58b7dd 2667 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2668 /* INVALID FIELD IN CDB */
9c58b7dd 2669 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2670 break;
2671 case TCM_INVALID_PARAMETER_LIST:
2672 /* CURRENT ERROR */
9c58b7dd
RD		 2673 buffer[0] = 0x70;
2674 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2675 /* ILLEGAL REQUEST */
9c58b7dd 2676 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2677 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2678 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db
NB		 2679 break;
2680 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2681 /* CURRENT ERROR */
9c58b7dd
RD		 2682 buffer[0] = 0x70;
2683 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2684 /* ABORTED COMMAND */
9c58b7dd 2685 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2686 /* WRITE ERROR */
9c58b7dd 2687 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2688 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2689 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2690 break;
2691 case TCM_SERVICE_CRC_ERROR:
2692 /* CURRENT ERROR */
9c58b7dd
RD		 2693 buffer[0] = 0x70;
2694 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2695 /* ABORTED COMMAND */
9c58b7dd 2696 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2697 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2698 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2699 /* N/A */
9c58b7dd 2700 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2701 break;
2702 case TCM_SNACK_REJECTED:
2703 /* CURRENT ERROR */
9c58b7dd
RD		 2704 buffer[0] = 0x70;
2705 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2706 /* ABORTED COMMAND */
9c58b7dd 2707 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2708 /* READ ERROR */
9c58b7dd 2709 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2710 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2711 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2712 break;
2713 case TCM_WRITE_PROTECTED:
2714 /* CURRENT ERROR */
9c58b7dd
RD		 2715 buffer[0] = 0x70;
2716 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2717 /* DATA PROTECT */
9c58b7dd 2718 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2719 /* WRITE PROTECTED */
9c58b7dd 2720 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2721 break;
e2397c70
RD		 2722 case TCM_ADDRESS_OUT_OF_RANGE:
2723 /* CURRENT ERROR */
9c58b7dd
RD		 2724 buffer[0] = 0x70;
2725 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2726 /* ILLEGAL REQUEST */
9c58b7dd 2727 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2728 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2729 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2730 break;
c66ac9db
NB		 2731 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2732 /* CURRENT ERROR */
9c58b7dd
RD		 2733 buffer[0] = 0x70;
2734 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2735 /* UNIT ATTENTION */
9c58b7dd 2736 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2737 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2738 buffer[SPC_ASC_KEY_OFFSET] = asc;
2739 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2740 break;
2741 case TCM_CHECK_CONDITION_NOT_READY:
2742 /* CURRENT ERROR */
9c58b7dd
RD		 2743 buffer[0] = 0x70;
2744 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2745 /* Not Ready */
9c58b7dd 2746 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2747 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2748 buffer[SPC_ASC_KEY_OFFSET] = asc;
2749 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2750 break;
2751 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2752 default:
2753 /* CURRENT ERROR */
9c58b7dd
RD		 2754 buffer[0] = 0x70;
2755 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2756 /* ILLEGAL REQUEST */
9c58b7dd 2757 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2758 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2759 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2760 break;
2761 }
2762 /*
2763 * This code uses linux/include/scsi/scsi.h SAM status codes!
2764 */
2765 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2766 /*
2767 * Automatically padded, this value is encoded in the fabric's
2768 * data_length response PDU containing the SCSI defined sense data.
2769 */
9c58b7dd 2770 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2771
2772after_reason:
07bde79a 2773 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2774}
2775EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2776
2777int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2778{
c18bc7d8
RD		 2779 if (!(cmd->transport_state & CMD_T_ABORTED))
2780 return 0;
c66ac9db 2781
c18bc7d8
RD		 2782 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2783 return 1;
8b1e1244 2784
c18bc7d8
RD		 2785 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2786 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2787
c18bc7d8
RD		 2788 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
2789 cmd->se_tfo->queue_status(cmd);
2790
2791 return 1;
c66ac9db
NB		 2792}
2793EXPORT_SYMBOL(transport_check_aborted_status);
2794
2795void transport_send_task_abort(struct se_cmd *cmd)
2796{
c252f003
NB		 2797 unsigned long flags;
2798
2799 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2800 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2801 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2802 return;
2803 }
2804 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2805
c66ac9db
NB		 2806 /*
2807 * If there are still expected incoming fabric WRITEs, we wait
2808 * until until they have completed before sending a TASK_ABORTED
2809 * response. This response with TASK_ABORTED status will be
2810 * queued back to fabric module by transport_check_aborted_status().
2811 */
2812 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2813 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2814 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2815 smp_mb__after_atomic_inc();
c66ac9db
NB		 2816 }
2817 }
2818 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2819
72b59d6e
RD		 2820 transport_lun_remove_cmd(cmd);
2821
6708bb27 2822 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2823 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2824 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2825
e3d6f909 2826 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2827}
2828
af877292 2829static void target_tmr_work(struct work_struct *work)
c66ac9db 2830{
af877292 2831 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2832 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2833 struct se_tmr_req *tmr = cmd->se_tmr_req;
2834 int ret;
2835
2836 switch (tmr->function) {
5c6cd613 2837 case TMR_ABORT_TASK:
3d28934a 2838 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2839 break;
5c6cd613
NB		 2840 case TMR_ABORT_TASK_SET:
2841 case TMR_CLEAR_ACA:
2842 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2843 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2844 break;
5c6cd613 2845 case TMR_LUN_RESET:
c66ac9db
NB		 2846 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2847 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2848 TMR_FUNCTION_REJECTED;
2849 break;
5c6cd613 2850 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2851 tmr->response = TMR_FUNCTION_REJECTED;
2852 break;
5c6cd613 2853 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2854 tmr->response = TMR_FUNCTION_REJECTED;
2855 break;
c66ac9db 2856 default:
6708bb27 2857 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2858 tmr->function);
2859 tmr->response = TMR_FUNCTION_REJECTED;
2860 break;
2861 }
2862
2863 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2864 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2865
b7b8bef7 2866 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2867}
2868
af877292
CH		 2869int transport_generic_handle_tmr(
2870 struct se_cmd *cmd)
c66ac9db 2871{
af877292
CH		 2872 INIT_WORK(&cmd->work, target_tmr_work);
2873 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2874 return 0;
2875}
af877292 2876EXPORT_SYMBOL(transport_generic_handle_tmr);
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