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target: Fix use-after-free in LUN RESET handling
[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 */
910 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
911 &vpd->device_identifier[0]);
912 break;
913 case 0x02: /* ASCII */
914 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
915 &vpd->device_identifier[0]);
916 break;
917 case 0x03: /* UTF-8 */
918 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
919 &vpd->device_identifier[0]);
920 break;
921 default:
922 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
923 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 924 ret = -EINVAL;
c66ac9db
NB		 925 break;
926 }
927
928 if (p_buf)
929 strncpy(p_buf, buf, p_buf_len);
930 else
6708bb27 931 pr_debug("%s", buf);
c66ac9db
NB		 932
933 return ret;
934}
935
936int
937transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
938{
939 static const char hex_str[] = "0123456789abcdef";
35d1efe8 940 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 941
942 /*
943 * The VPD Code Set (encoding)
944 *
945 * from spc3r23.pdf Section 7.6.3.1 Table 296
946 */
947 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
948 switch (vpd->device_identifier_code_set) {
949 case 0x01: /* Binary */
950 vpd->device_identifier[j++] =
951 hex_str[vpd->device_identifier_type];
952 while (i < (4 + page_83[3])) {
953 vpd->device_identifier[j++] =
954 hex_str[(page_83[i] & 0xf0) >> 4];
955 vpd->device_identifier[j++] =
956 hex_str[page_83[i] & 0x0f];
957 i++;
958 }
959 break;
960 case 0x02: /* ASCII */
961 case 0x03: /* UTF-8 */
962 while (i < (4 + page_83[3]))
963 vpd->device_identifier[j++] = page_83[i++];
964 break;
965 default:
966 break;
967 }
968
969 return transport_dump_vpd_ident(vpd, NULL, 0);
970}
971EXPORT_SYMBOL(transport_set_vpd_ident);
972
de103c93
CH		 973sense_reason_t
974target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 975{
976 struct se_device *dev = cmd->se_dev;
977
978 if (cmd->unknown_data_length) {
979 cmd->data_length = size;
980 } else if (size != cmd->data_length) {
981 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
982 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
983 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
984 cmd->data_length, size, cmd->t_task_cdb[0]);
985
9b3b8041
CH		 986 if (cmd->data_direction == DMA_TO_DEVICE) {
987 pr_err("Rejecting underflow/overflow"
988 " WRITE data\n");
de103c93 989 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 990 }
991 /*
992 * Reject READ_* or WRITE_* with overflow/underflow for
993 * type SCF_SCSI_DATA_CDB.
994 */
0fd97ccf 995 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 996 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
997 " CDB on non 512-byte sector setup subsystem"
998 " plugin: %s\n", dev->transport->name);
999 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1000 return TCM_INVALID_CDB_FIELD;
9b3b8041 1001 }
4c054ba6
NB		 1002 /*
1003 * For the overflow case keep the existing fabric provided
1004 * ->data_length. Otherwise for the underflow case, reset
1005 * ->data_length to the smaller SCSI expected data transfer
1006 * length.
1007 */
9b3b8041
CH		 1008 if (size > cmd->data_length) {
1009 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1010 cmd->residual_count = (size - cmd->data_length);
1011 } else {
1012 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1013 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1014 cmd->data_length = size;
9b3b8041 1015 }
9b3b8041
CH		 1016 }
1017
1018 return 0;
1019
9b3b8041
CH		 1020}
1021
c66ac9db
NB		 1022/*
1023 * Used by fabric modules containing a local struct se_cmd within their
1024 * fabric dependent per I/O descriptor.
1025 */
1026void transport_init_se_cmd(
1027 struct se_cmd *cmd,
1028 struct target_core_fabric_ops *tfo,
1029 struct se_session *se_sess,
1030 u32 data_length,
1031 int data_direction,
1032 int task_attr,
1033 unsigned char *sense_buffer)
1034{
5951146d
AG		 1035 INIT_LIST_HEAD(&cmd->se_lun_node);
1036 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1037 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1038 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1039 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1040 init_completion(&cmd->transport_lun_fe_stop_comp);
1041 init_completion(&cmd->transport_lun_stop_comp);
1042 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1043 init_completion(&cmd->cmd_wait_comp);
cf572a96 1044 init_completion(&cmd->task_stop_comp);
a1d8b49a 1045 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1046 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1047
1048 cmd->se_tfo = tfo;
1049 cmd->se_sess = se_sess;
1050 cmd->data_length = data_length;
1051 cmd->data_direction = data_direction;
1052 cmd->sam_task_attr = task_attr;
1053 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1054
1055 cmd->state_active = false;
c66ac9db
NB		 1056}
1057EXPORT_SYMBOL(transport_init_se_cmd);
1058
de103c93
CH		 1059static sense_reason_t
1060transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1061{
019c4ca6
CH		 1062 struct se_device *dev = cmd->se_dev;
1063
c66ac9db
NB		 1064 /*
1065 * Check if SAM Task Attribute emulation is enabled for this
1066 * struct se_device storage object
1067 */
019c4ca6 1068 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1069 return 0;
1070
e66ecd50 1071 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1072 pr_debug("SAM Task Attribute ACA"
c66ac9db 1073 " emulation is not supported\n");
de103c93 1074 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1075 }
1076 /*
1077 * Used to determine when ORDERED commands should go from
1078 * Dormant to Active status.
1079 */
019c4ca6 1080 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1081 smp_mb__after_atomic_inc();
6708bb27 1082 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1083 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1084 dev->transport->name);
c66ac9db
NB		 1085 return 0;
1086}
1087
de103c93
CH		 1088sense_reason_t
1089target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1090{
0fd97ccf 1091 struct se_device *dev = cmd->se_dev;
cb4f4d3c 1092 unsigned long flags;
de103c93 1093 sense_reason_t ret;
c66ac9db 1094
c66ac9db
NB		 1095 /*
1096 * Ensure that the received CDB is less than the max (252 + 8) bytes
1097 * for VARIABLE_LENGTH_CMD
1098 */
1099 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1100 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1101 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1102 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1103 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1104 }
1105 /*
1106 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1107 * allocate the additional extended CDB buffer now.. Otherwise
1108 * setup the pointer from __t_task_cdb to t_task_cdb.
1109 */
a1d8b49a
AG		 1110 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1111 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1112 GFP_KERNEL);
6708bb27
AG		 1113 if (!cmd->t_task_cdb) {
1114 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1115 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1116 scsi_command_size(cdb),
a1d8b49a 1117 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1118 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1119 }
1120 } else
a1d8b49a 1121 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1122 /*
a1d8b49a 1123 * Copy the original CDB into cmd->
c66ac9db 1124 */
a1d8b49a 1125 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1126
1127 /*
1128 * Check for an existing UNIT ATTENTION condition
1129 */
de103c93
CH		 1130 ret = target_scsi3_ua_check(cmd);
1131 if (ret)
1132 return ret;
cb4f4d3c 1133
c87fbd56 1134 ret = target_alua_state_check(cmd);
de103c93
CH		 1135 if (ret)
1136 return ret;
cb4f4d3c 1137
d977f437 1138 ret = target_check_reservation(cmd);
de103c93 1139 if (ret)
d977f437 1140 return ret;
cb4f4d3c 1141
0fd97ccf 1142 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1143 if (ret)
1144 return ret;
1145
1146 ret = transport_check_alloc_task_attr(cmd);
1147 if (ret)
c66ac9db 1148 return ret;
cb4f4d3c
CH		 1149
1150 spin_lock_irqsave(&cmd->t_state_lock, flags);
1151 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1152 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1153
c66ac9db
NB		 1154 spin_lock(&cmd->se_lun->lun_sep_lock);
1155 if (cmd->se_lun->lun_sep)
1156 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1157 spin_unlock(&cmd->se_lun->lun_sep_lock);
1158 return 0;
1159}
a12f41f8 1160EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1161
695434e1
NB		 1162/*
1163 * Used by fabric module frontends to queue tasks directly.
1164 * Many only be used from process context only
1165 */
1166int transport_handle_cdb_direct(
1167 struct se_cmd *cmd)
1168{
de103c93 1169 sense_reason_t ret;
dd8ae59d 1170
695434e1
NB		 1171 if (!cmd->se_lun) {
1172 dump_stack();
6708bb27 1173 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1174 return -EINVAL;
1175 }
1176 if (in_interrupt()) {
1177 dump_stack();
6708bb27 1178 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1179 " from interrupt context\n");
1180 return -EINVAL;
1181 }
dd8ae59d 1182 /*
af877292
CH		 1183 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1184 * outstanding descriptors are handled correctly during shutdown via
1185 * transport_wait_for_tasks()
dd8ae59d
NB		 1186 *
1187 * Also, we don't take cmd->t_state_lock here as we only expect
1188 * this to be called for initial descriptor submission.
1189 */
1190 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1191 cmd->transport_state |= CMD_T_ACTIVE;
1192
dd8ae59d
NB		 1193 /*
1194 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1195 * so follow TRANSPORT_NEW_CMD processing thread context usage
1196 * and call transport_generic_request_failure() if necessary..
1197 */
1198 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1199 if (ret)
1200 transport_generic_request_failure(cmd, ret);
dd8ae59d 1201 return 0;
695434e1
NB		 1202}
1203EXPORT_SYMBOL(transport_handle_cdb_direct);
1204
de103c93
CH		 1205static sense_reason_t
1206transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1207 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1208{
1209 if (!sgl || !sgl_count)
1210 return 0;
1211
1212 /*
1213 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1214 * scatterlists already have been set to follow what the fabric
1215 * passes for the original expected data transfer length.
1216 */
1217 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1218 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1219 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1220 return TCM_INVALID_CDB_FIELD;
1221 }
1222
1223 cmd->t_data_sg = sgl;
1224 cmd->t_data_nents = sgl_count;
1225
1226 if (sgl_bidi && sgl_bidi_count) {
1227 cmd->t_bidi_data_sg = sgl_bidi;
1228 cmd->t_bidi_data_nents = sgl_bidi_count;
1229 }
1230 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1231 return 0;
1232}
1233
a026757f
NB		 1234/*
1235 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1236 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1237 *
1238 * @se_cmd: command descriptor to submit
1239 * @se_sess: associated se_sess for endpoint
1240 * @cdb: pointer to SCSI CDB
1241 * @sense: pointer to SCSI sense buffer
1242 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1243 * @data_length: fabric expected data transfer length
1244 * @task_addr: SAM task attribute
1245 * @data_dir: DMA data direction
1246 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1247 * @sgl: struct scatterlist memory for unidirectional mapping
1248 * @sgl_count: scatterlist count for unidirectional mapping
1249 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1250 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1251 *
d6dfc868
RD		 1252 * Returns non zero to signal active I/O shutdown failure. All other
1253 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1254 * but still return zero here.
1255 *
a6360785
NB		 1256 * This may only be called from process context, and also currently
1257 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1258 */
1259int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1260 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1261 u32 data_length, int task_attr, int data_dir, int flags,
1262 struct scatterlist *sgl, u32 sgl_count,
1263 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1264{
1265 struct se_portal_group *se_tpg;
de103c93
CH		 1266 sense_reason_t rc;
1267 int ret;
a6360785
NB		 1268
1269 se_tpg = se_sess->se_tpg;
1270 BUG_ON(!se_tpg);
1271 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1272 BUG_ON(in_interrupt());
1273 /*
1274 * Initialize se_cmd for target operation. From this point
1275 * exceptions are handled by sending exception status via
1276 * target_core_fabric_ops->queue_status() callback
1277 */
1278 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1279 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1280 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1281 se_cmd->unknown_data_length = 1;
a6360785
NB		 1282 /*
1283 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1284 * se_sess->sess_cmd_list. A second kref_get here is necessary
1285 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1286 * kref_put() to happen during fabric packet acknowledgement.
1287 */
de103c93
CH		 1288 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1289 if (ret)
1290 return ret;
a6360785
NB		 1291 /*
1292 * Signal bidirectional data payloads to target-core
1293 */
1294 if (flags & TARGET_SCF_BIDI_OP)
1295 se_cmd->se_cmd_flags |= SCF_BIDI;
1296 /*
1297 * Locate se_lun pointer and attach it to struct se_cmd
1298 */
de103c93
CH		 1299 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1300 if (rc) {
1301 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1302 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1303 return 0;
735703ca 1304 }
d6e0175c 1305
a12f41f8 1306 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1307 if (rc != 0) {
de103c93 1308 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1309 return 0;
735703ca 1310 }
a026757f
NB		 1311 /*
1312 * When a non zero sgl_count has been passed perform SGL passthrough
1313 * mapping for pre-allocated fabric memory instead of having target
1314 * core perform an internal SGL allocation..
1315 */
1316 if (sgl_count != 0) {
1317 BUG_ON(!sgl);
1318
944981c7
NB		 1319 /*
1320 * A work-around for tcm_loop as some userspace code via
1321 * scsi-generic do not memset their associated read buffers,
1322 * so go ahead and do that here for type non-data CDBs. Also
1323 * note that this is currently guaranteed to be a single SGL
1324 * for this case by target core in target_setup_cmd_from_cdb()
1325 * -> transport_generic_cmd_sequencer().
1326 */
1327 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1328 se_cmd->data_direction == DMA_FROM_DEVICE) {
1329 unsigned char *buf = NULL;
1330
1331 if (sgl)
1332 buf = kmap(sg_page(sgl)) + sgl->offset;
1333
1334 if (buf) {
1335 memset(buf, 0, sgl->length);
1336 kunmap(sg_page(sgl));
1337 }
1338 }
1339
a026757f
NB		 1340 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1341 sgl_bidi, sgl_bidi_count);
1342 if (rc != 0) {
de103c93 1343 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1344 return 0;
1345 }
1346 }
11e319ed
AG		 1347 /*
1348 * Check if we need to delay processing because of ALUA
1349 * Active/NonOptimized primary access state..
1350 */
1351 core_alua_check_nonop_delay(se_cmd);
1352
a6360785 1353 transport_handle_cdb_direct(se_cmd);
d6dfc868 1354 return 0;
a6360785 1355}
a026757f
NB		 1356EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1357
1358/*
1359 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1360 *
1361 * @se_cmd: command descriptor to submit
1362 * @se_sess: associated se_sess for endpoint
1363 * @cdb: pointer to SCSI CDB
1364 * @sense: pointer to SCSI sense buffer
1365 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1366 * @data_length: fabric expected data transfer length
1367 * @task_addr: SAM task attribute
1368 * @data_dir: DMA data direction
1369 * @flags: flags for command submission from target_sc_flags_tables
1370 *
1371 * Returns non zero to signal active I/O shutdown failure. All other
1372 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1373 * but still return zero here.
1374 *
1375 * This may only be called from process context, and also currently
1376 * assumes internal allocation of fabric payload buffer by target-core.
1377 *
1378 * It also assumes interal target core SGL memory allocation.
1379 */
1380int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1381 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1382 u32 data_length, int task_attr, int data_dir, int flags)
1383{
1384 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1385 unpacked_lun, data_length, task_attr, data_dir,
1386 flags, NULL, 0, NULL, 0);
1387}
a6360785
NB		 1388EXPORT_SYMBOL(target_submit_cmd);
1389
9f0d05c2
NB		 1390static void target_complete_tmr_failure(struct work_struct *work)
1391{
1392 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1393
1394 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1395 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
9f0d05c2
NB		 1396}
1397
ea98d7f9
AG		 1398/**
1399 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1400 * for TMR CDBs
1401 *
1402 * @se_cmd: command descriptor to submit
1403 * @se_sess: associated se_sess for endpoint
1404 * @sense: pointer to SCSI sense buffer
1405 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1406 * @fabric_context: fabric context for TMR req
1407 * @tm_type: Type of TM request
c0974f89
NB		 1408 * @gfp: gfp type for caller
1409 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1410 * @flags: submit cmd flags
ea98d7f9
AG		 1411 *
1412 * Callable from all contexts.
1413 **/
1414
c7042cae 1415int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1416 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1417 void *fabric_tmr_ptr, unsigned char tm_type,
1418 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1419{
1420 struct se_portal_group *se_tpg;
1421 int ret;
1422
1423 se_tpg = se_sess->se_tpg;
1424 BUG_ON(!se_tpg);
1425
1426 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1427 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1428 /*
1429 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1430 * allocation failure.
1431 */
c0974f89 1432 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1433 if (ret < 0)
1434 return -ENOMEM;
ea98d7f9 1435
c0974f89
NB		 1436 if (tm_type == TMR_ABORT_TASK)
1437 se_cmd->se_tmr_req->ref_task_tag = tag;
1438
ea98d7f9 1439 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1440 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1441 if (ret) {
1442 core_tmr_release_req(se_cmd->se_tmr_req);
1443 return ret;
1444 }
ea98d7f9 1445
ea98d7f9
AG		 1446 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1447 if (ret) {
9f0d05c2
NB		 1448 /*
1449 * For callback during failure handling, push this work off
1450 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1451 */
1452 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1453 schedule_work(&se_cmd->work);
c7042cae 1454 return 0;
ea98d7f9
AG		 1455 }
1456 transport_generic_handle_tmr(se_cmd);
c7042cae 1457 return 0;
ea98d7f9
AG		 1458}
1459EXPORT_SYMBOL(target_submit_tmr);
1460
cdbb70bb 1461/*
cf572a96 1462 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1463 * has completed.
1464 */
cf572a96 1465bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1466{
cdbb70bb
CH		 1467 bool was_active = false;
1468
cf572a96
CH		 1469 if (cmd->transport_state & CMD_T_BUSY) {
1470 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1471 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1472
cf572a96
CH		 1473 pr_debug("cmd %p waiting to complete\n", cmd);
1474 wait_for_completion(&cmd->task_stop_comp);
1475 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1476
1477 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1478 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1479 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1480 was_active = true;
1481 }
1482
cdbb70bb
CH		 1483 return was_active;
1484}
1485
c66ac9db
NB		 1486/*
1487 * Handle SAM-esque emulation for generic transport request failures.
1488 */
de103c93
CH		 1489void transport_generic_request_failure(struct se_cmd *cmd,
1490 sense_reason_t sense_reason)
c66ac9db 1491{
07bde79a
NB		 1492 int ret = 0;
1493
6708bb27 1494 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1495 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1496 cmd->t_task_cdb[0]);
de103c93 1497 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1498 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1499 cmd->t_state, sense_reason);
d43d6aea 1500 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1501 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1502 (cmd->transport_state & CMD_T_STOP) != 0,
1503 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1504
c66ac9db
NB		 1505 /*
1506 * For SAM Task Attribute emulation for failed struct se_cmd
1507 */
019c4ca6 1508 transport_complete_task_attr(cmd);
c66ac9db 1509
de103c93 1510 switch (sense_reason) {
03e98c9e
NB		 1511 case TCM_NON_EXISTENT_LUN:
1512 case TCM_UNSUPPORTED_SCSI_OPCODE:
1513 case TCM_INVALID_CDB_FIELD:
1514 case TCM_INVALID_PARAMETER_LIST:
1515 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1516 case TCM_UNKNOWN_MODE_PAGE:
1517 case TCM_WRITE_PROTECTED:
e2397c70 1518 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1519 case TCM_CHECK_CONDITION_ABORT_CMD:
1520 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1521 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1522 break;
de103c93
CH		 1523 case TCM_OUT_OF_RESOURCES:
1524 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1525 break;
03e98c9e 1526 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1527 /*
1528 * No SENSE Data payload for this case, set SCSI Status
1529 * and queue the response to $FABRIC_MOD.
1530 *
1531 * Uses linux/include/scsi/scsi.h SAM status codes defs
1532 */
1533 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1534 /*
1535 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1536 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1537 * CONFLICT STATUS.
1538 *
1539 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1540 */
e3d6f909 1541 if (cmd->se_sess &&
0fd97ccf 1542 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1543 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1544 cmd->orig_fe_lun, 0x2C,
1545 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1546
07bde79a 1547 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1548 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1549 goto queue_full;
c66ac9db 1550 goto check_stop;
c66ac9db 1551 default:
6708bb27 1552 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1553 cmd->t_task_cdb[0], sense_reason);
1554 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1555 break;
1556 }
f3146437 1557
de103c93 1558 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1559 if (ret == -EAGAIN || ret == -ENOMEM)
1560 goto queue_full;
07bde79a 1561
c66ac9db
NB		 1562check_stop:
1563 transport_lun_remove_cmd(cmd);
6708bb27 1564 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1565 ;
07bde79a
NB		 1566 return;
1567
1568queue_full:
e057f533
CH		 1569 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1570 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1571}
2fbff127 1572EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1573
5f41a31d 1574static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1575{
de103c93 1576 sense_reason_t ret;
5f41a31d
CH		 1577
1578 spin_lock_irq(&cmd->t_state_lock);
1579 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1580 spin_unlock_irq(&cmd->t_state_lock);
1581
de103c93
CH		 1582 if (cmd->execute_cmd) {
1583 ret = cmd->execute_cmd(cmd);
1584 if (ret) {
1585 spin_lock_irq(&cmd->t_state_lock);
1586 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1587 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1588
de103c93
CH		 1589 transport_generic_request_failure(cmd, ret);
1590 }
5f41a31d
CH		 1591 }
1592}
1593
019c4ca6 1594static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1595{
1596 struct se_device *dev = cmd->se_dev;
1597
019c4ca6
CH		 1598 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1599 return false;
5f41a31d 1600
c66ac9db 1601 /*
25985edc 1602 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1603 * to allow the passed struct se_cmd list of tasks to the front of the list.
1604 */
5f41a31d
CH		 1605 switch (cmd->sam_task_attr) {
1606 case MSG_HEAD_TAG:
1607 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1608 "se_ordered_id: %u\n",
1609 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1610 return false;
5f41a31d
CH		 1611 case MSG_ORDERED_TAG:
1612 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1613 smp_mb__after_atomic_inc();
1614
5f41a31d
CH		 1615 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1616 " se_ordered_id: %u\n",
1617 cmd->t_task_cdb[0], cmd->se_ordered_id);
1618
c66ac9db 1619 /*
5f41a31d
CH		 1620 * Execute an ORDERED command if no other older commands
1621 * exist that need to be completed first.
c66ac9db 1622 */
5f41a31d 1623 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1624 return false;
5f41a31d
CH		 1625 break;
1626 default:
c66ac9db
NB		 1627 /*
1628 * For SIMPLE and UNTAGGED Task Attribute commands
1629 */
5f41a31d 1630 atomic_inc(&dev->simple_cmds);
c66ac9db 1631 smp_mb__after_atomic_inc();
5f41a31d 1632 break;
c66ac9db 1633 }
5f41a31d 1634
019c4ca6
CH		 1635 if (atomic_read(&dev->dev_ordered_sync) == 0)
1636 return false;
c66ac9db 1637
019c4ca6
CH		 1638 spin_lock(&dev->delayed_cmd_lock);
1639 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1640 spin_unlock(&dev->delayed_cmd_lock);
1641
1642 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1643 " delayed CMD list, se_ordered_id: %u\n",
1644 cmd->t_task_cdb[0], cmd->sam_task_attr,
1645 cmd->se_ordered_id);
1646 return true;
1647}
1648
1649void target_execute_cmd(struct se_cmd *cmd)
1650{
1651 /*
1652 * If the received CDB has aleady been aborted stop processing it here.
1653 */
5bd665f2
LT		 1654 if (transport_check_aborted_status(cmd, 1)) {
1655 complete(&cmd->transport_lun_stop_comp);
5f41a31d 1656 return;
c66ac9db 1657 }
c66ac9db 1658
c66ac9db 1659 /*
019c4ca6
CH		 1660 * Determine if IOCTL context caller in requesting the stopping of this
1661 * command for LUN shutdown purposes.
c66ac9db 1662 */
019c4ca6
CH		 1663 spin_lock_irq(&cmd->t_state_lock);
1664 if (cmd->transport_state & CMD_T_LUN_STOP) {
1665 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1666 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1667
1668 cmd->transport_state &= ~CMD_T_ACTIVE;
1669 spin_unlock_irq(&cmd->t_state_lock);
1670 complete(&cmd->transport_lun_stop_comp);
1671 return;
1672 }
1673 /*
1674 * Determine if frontend context caller is requesting the stopping of
1675 * this command for frontend exceptions.
1676 */
1677 if (cmd->transport_state & CMD_T_STOP) {
1678 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1679 __func__, __LINE__,
1680 cmd->se_tfo->get_task_tag(cmd));
1681
1682 spin_unlock_irq(&cmd->t_state_lock);
1683 complete(&cmd->t_transport_stop_comp);
1684 return;
1685 }
1686
1687 cmd->t_state = TRANSPORT_PROCESSING;
e627c615 1688 cmd->transport_state |= CMD_T_ACTIVE;
019c4ca6
CH		 1689 spin_unlock_irq(&cmd->t_state_lock);
1690
1691 if (!target_handle_task_attr(cmd))
1692 __target_execute_cmd(cmd);
c66ac9db 1693}
70baf0ab 1694EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1695
5f41a31d
CH		 1696/*
1697 * Process all commands up to the last received ORDERED task attribute which
1698 * requires another blocking boundary
1699 */
1700static void target_restart_delayed_cmds(struct se_device *dev)
1701{
1702 for (;;) {
1703 struct se_cmd *cmd;
1704
1705 spin_lock(&dev->delayed_cmd_lock);
1706 if (list_empty(&dev->delayed_cmd_list)) {
1707 spin_unlock(&dev->delayed_cmd_lock);
1708 break;
1709 }
1710
1711 cmd = list_entry(dev->delayed_cmd_list.next,
1712 struct se_cmd, se_delayed_node);
1713 list_del(&cmd->se_delayed_node);
1714 spin_unlock(&dev->delayed_cmd_lock);
1715
1716 __target_execute_cmd(cmd);
1717
1718 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1719 break;
1720 }
1721}
1722
c66ac9db 1723/*
35e0e757 1724 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1725 * and ordered cmds need to have their tasks added to the execution queue.
1726 */
1727static void transport_complete_task_attr(struct se_cmd *cmd)
1728{
5951146d 1729 struct se_device *dev = cmd->se_dev;
c66ac9db 1730
019c4ca6
CH		 1731 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1732 return;
1733
e66ecd50 1734 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1735 atomic_dec(&dev->simple_cmds);
1736 smp_mb__after_atomic_dec();
1737 dev->dev_cur_ordered_id++;
6708bb27 1738 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1739 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1740 cmd->se_ordered_id);
e66ecd50 1741 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1742 dev->dev_cur_ordered_id++;
6708bb27 1743 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1744 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1745 cmd->se_ordered_id);
e66ecd50 1746 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1747 atomic_dec(&dev->dev_ordered_sync);
1748 smp_mb__after_atomic_dec();
c66ac9db
NB		 1749
1750 dev->dev_cur_ordered_id++;
6708bb27 1751 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1752 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1753 }
c66ac9db 1754
5f41a31d 1755 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1756}
1757
e057f533 1758static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1759{
1760 int ret = 0;
1761
019c4ca6 1762 transport_complete_task_attr(cmd);
e057f533
CH		 1763
1764 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1765 ret = cmd->se_tfo->queue_status(cmd);
1766 if (ret)
1767 goto out;
1768 }
07bde79a
NB		 1769
1770 switch (cmd->data_direction) {
1771 case DMA_FROM_DEVICE:
1772 ret = cmd->se_tfo->queue_data_in(cmd);
1773 break;
1774 case DMA_TO_DEVICE:
ec98f782 1775 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 1776 ret = cmd->se_tfo->queue_data_in(cmd);
1777 if (ret < 0)
e057f533 1778 break;
07bde79a
NB		 1779 }
1780 /* Fall through for DMA_TO_DEVICE */
1781 case DMA_NONE:
1782 ret = cmd->se_tfo->queue_status(cmd);
1783 break;
1784 default:
1785 break;
1786 }
1787
e057f533
CH		 1788out:
1789 if (ret < 0) {
1790 transport_handle_queue_full(cmd, cmd->se_dev);
1791 return;
1792 }
1793 transport_lun_remove_cmd(cmd);
1794 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1795}
1796
1797static void transport_handle_queue_full(
1798 struct se_cmd *cmd,
e057f533 1799 struct se_device *dev)
07bde79a
NB		 1800{
1801 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1802 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1803 atomic_inc(&dev->dev_qf_count);
1804 smp_mb__after_atomic_inc();
1805 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1806
1807 schedule_work(&cmd->se_dev->qf_work_queue);
1808}
1809
35e0e757 1810static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1811{
35e0e757 1812 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1813 int ret;
35e0e757 1814
c66ac9db
NB		 1815 /*
1816 * Check if we need to move delayed/dormant tasks from cmds on the
1817 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1818 * Attribute.
1819 */
019c4ca6
CH		 1820 transport_complete_task_attr(cmd);
1821
07bde79a
NB		 1822 /*
1823 * Check to schedule QUEUE_FULL work, or execute an existing
1824 * cmd->transport_qf_callback()
1825 */
1826 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1827 schedule_work(&cmd->se_dev->qf_work_queue);
1828
c66ac9db 1829 /*
d5829eac 1830 * Check if we need to send a sense buffer from
c66ac9db
NB		 1831 * the struct se_cmd in question.
1832 */
1833 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1834 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1835 ret = transport_send_check_condition_and_sense(
1836 cmd, 0, 1);
1837 if (ret == -EAGAIN || ret == -ENOMEM)
1838 goto queue_full;
1839
1840 transport_lun_remove_cmd(cmd);
1841 transport_cmd_check_stop_to_fabric(cmd);
1842 return;
c66ac9db
NB		 1843 }
1844 /*
25985edc 1845 * Check for a callback, used by amongst other things
c66ac9db
NB		 1846 * XDWRITE_READ_10 emulation.
1847 */
1848 if (cmd->transport_complete_callback)
1849 cmd->transport_complete_callback(cmd);
1850
1851 switch (cmd->data_direction) {
1852 case DMA_FROM_DEVICE:
1853 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1854 if (cmd->se_lun->lun_sep) {
1855 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1856 cmd->data_length;
1857 }
1858 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1859
07bde79a 1860 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1861 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1862 goto queue_full;
c66ac9db
NB		 1863 break;
1864 case DMA_TO_DEVICE:
1865 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1866 if (cmd->se_lun->lun_sep) {
1867 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1868 cmd->data_length;
1869 }
1870 spin_unlock(&cmd->se_lun->lun_sep_lock);
1871 /*
1872 * Check if we need to send READ payload for BIDI-COMMAND
1873 */
ec98f782 1874 if (cmd->t_bidi_data_sg) {
c66ac9db 1875 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1876 if (cmd->se_lun->lun_sep) {
1877 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1878 cmd->data_length;
1879 }
1880 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1881 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1882 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1883 goto queue_full;
c66ac9db
NB		 1884 break;
1885 }
1886 /* Fall through for DMA_TO_DEVICE */
1887 case DMA_NONE:
07bde79a 1888 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1889 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1890 goto queue_full;
c66ac9db
NB		 1891 break;
1892 default:
1893 break;
1894 }
1895
1896 transport_lun_remove_cmd(cmd);
1897 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1898 return;
1899
1900queue_full:
6708bb27 1901 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1902 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1903 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1904 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1905}
1906
6708bb27 1907static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 1908{
ec98f782 1909 struct scatterlist *sg;
ec98f782 1910 int count;
c66ac9db 1911
6708bb27
AG		 1912 for_each_sg(sgl, sg, nents, count)
1913 __free_page(sg_page(sg));
c66ac9db 1914
6708bb27
AG		 1915 kfree(sgl);
1916}
c66ac9db 1917
6708bb27
AG		 1918static inline void transport_free_pages(struct se_cmd *cmd)
1919{
1920 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
1921 return;
1922
1923 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 1924 cmd->t_data_sg = NULL;
1925 cmd->t_data_nents = 0;
c66ac9db 1926
6708bb27 1927 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 1928 cmd->t_bidi_data_sg = NULL;
1929 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 1930}
1931
e26d99ae
CH		 1932/**
1933 * transport_release_cmd - free a command
1934 * @cmd: command to free
1935 *
1936 * This routine unconditionally frees a command, and reference counting
1937 * or list removal must be done in the caller.
1938 */
1939static void transport_release_cmd(struct se_cmd *cmd)
1940{
1941 BUG_ON(!cmd->se_tfo);
1942
c8e31f26 1943 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 1944 core_tmr_release_req(cmd->se_tmr_req);
1945 if (cmd->t_task_cdb != cmd->__t_task_cdb)
1946 kfree(cmd->t_task_cdb);
1947 /*
7481deb4
NB		 1948 * If this cmd has been setup with target_get_sess_cmd(), drop
1949 * the kref and call ->release_cmd() in kref callback.
e26d99ae 1950 */
7481deb4
NB		 1951 if (cmd->check_release != 0) {
1952 target_put_sess_cmd(cmd->se_sess, cmd);
1953 return;
1954 }
e26d99ae
CH		 1955 cmd->se_tfo->release_cmd(cmd);
1956}
1957
d3df7825
CH		 1958/**
1959 * transport_put_cmd - release a reference to a command
1960 * @cmd: command to release
1961 *
1962 * This routine releases our reference to the command and frees it if possible.
1963 */
39c05f32 1964static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 1965{
1966 unsigned long flags;
c66ac9db 1967
a1d8b49a 1968 spin_lock_irqsave(&cmd->t_state_lock, flags);
d9ed6947
RD		 1969 if (atomic_read(&cmd->t_fe_count) &&
1970 !atomic_dec_and_test(&cmd->t_fe_count)) {
1971 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1972 return;
4911e3cc
CH		 1973 }
1974
7d680f3b
CH		 1975 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
1976 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 1977 target_remove_from_state_list(cmd);
c66ac9db 1978 }
a1d8b49a 1979 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 1980
c66ac9db 1981 transport_free_pages(cmd);
31afc39c 1982 transport_release_cmd(cmd);
39c05f32 1983 return;
c66ac9db 1984}
c66ac9db 1985
4949314c 1986void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 1987{
ec98f782 1988 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 1989 struct page **pages;
1990 int i;
05d1c7c0
AG		 1991
1992 /*
ec98f782
AG		 1993 * We need to take into account a possible offset here for fabrics like
1994 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
1995 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 1996 */
4949314c
AG		 1997 if (!cmd->t_data_nents)
1998 return NULL;
3717ef0c
PB		 1999
2000 BUG_ON(!sg);
2001 if (cmd->t_data_nents == 1)
4949314c
AG		 2002 return kmap(sg_page(sg)) + sg->offset;
2003
2004 /* >1 page. use vmap */
2005 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2006 if (!pages)
4949314c
AG		 2007 return NULL;
2008
2009 /* convert sg[] to pages[] */
2010 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2011 pages[i] = sg_page(sg);
2012 }
2013
2014 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2015 kfree(pages);
de103c93 2016 if (!cmd->t_data_vmap)
4949314c
AG		 2017 return NULL;
2018
2019 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2020}
4949314c 2021EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2022
4949314c 2023void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2024{
a1edf9cf 2025 if (!cmd->t_data_nents) {
4949314c 2026 return;
a1edf9cf 2027 } else if (cmd->t_data_nents == 1) {
4949314c 2028 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2029 return;
2030 }
4949314c
AG		 2031
2032 vunmap(cmd->t_data_vmap);
2033 cmd->t_data_vmap = NULL;
05d1c7c0 2034}
4949314c 2035EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2036
c66ac9db 2037static int
05d1c7c0 2038transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2039{
ec98f782
AG		 2040 u32 length = cmd->data_length;
2041 unsigned int nents;
2042 struct page *page;
9db9da33 2043 gfp_t zero_flag;
ec98f782 2044 int i = 0;
c66ac9db 2045
ec98f782
AG		 2046 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2047 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2048 if (!cmd->t_data_sg)
2049 return -ENOMEM;
c66ac9db 2050
ec98f782
AG		 2051 cmd->t_data_nents = nents;
2052 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2053
64f1db38 2054 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2055
ec98f782
AG		 2056 while (length) {
2057 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2058 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2059 if (!page)
2060 goto out;
c66ac9db 2061
ec98f782
AG		 2062 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2063 length -= page_len;
2064 i++;
c66ac9db 2065 }
c66ac9db 2066 return 0;
c66ac9db 2067
ec98f782 2068out:
d0e27c88 2069 while (i > 0) {
ec98f782 2070 i--;
d0e27c88 2071 __free_page(sg_page(&cmd->t_data_sg[i]));
c66ac9db 2072 }
ec98f782
AG		 2073 kfree(cmd->t_data_sg);
2074 cmd->t_data_sg = NULL;
2075 return -ENOMEM;
c66ac9db
NB		 2076}
2077
da0f7619 2078/*
b16a35b0
AG		 2079 * Allocate any required resources to execute the command. For writes we
2080 * might not have the payload yet, so notify the fabric via a call to
2081 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2082 */
de103c93
CH		 2083sense_reason_t
2084transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2085{
c66ac9db
NB		 2086 int ret = 0;
2087
2088 /*
2089 * Determine is the TCM fabric module has already allocated physical
2090 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2091 * beforehand.
c66ac9db 2092 */
ec98f782
AG		 2093 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2094 cmd->data_length) {
05d1c7c0 2095 ret = transport_generic_get_mem(cmd);
c66ac9db 2096 if (ret < 0)
de103c93 2097 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2098 }
da0f7619 2099
4101f0a8 2100 atomic_inc(&cmd->t_fe_count);
4101f0a8 2101
c66ac9db 2102 /*
c3196f0c
CH		 2103 * If this command is not a write we can execute it right here,
2104 * for write buffers we need to notify the fabric driver first
2105 * and let it call back once the write buffers are ready.
c66ac9db 2106 */
5f41a31d 2107 target_add_to_state_list(cmd);
c3196f0c
CH		 2108 if (cmd->data_direction != DMA_TO_DEVICE) {
2109 target_execute_cmd(cmd);
2110 return 0;
2111 }
2112
2113 spin_lock_irq(&cmd->t_state_lock);
2114 cmd->t_state = TRANSPORT_WRITE_PENDING;
2115 spin_unlock_irq(&cmd->t_state_lock);
2116
2117 transport_cmd_check_stop(cmd, false);
2118
2119 ret = cmd->se_tfo->write_pending(cmd);
2120 if (ret == -EAGAIN || ret == -ENOMEM)
2121 goto queue_full;
2122
de103c93
CH		 2123 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2124 WARN_ON(ret);
2125
b69c1fcf 2126 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2127
c3196f0c
CH		 2128queue_full:
2129 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2130 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2131 transport_handle_queue_full(cmd, cmd->se_dev);
2132 return 0;
c66ac9db 2133}
a1d8b49a 2134EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2135
e057f533 2136static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2137{
f147abb4
NB		 2138 int ret;
2139
2140 ret = cmd->se_tfo->write_pending(cmd);
2141 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2142 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2143 cmd);
2144 transport_handle_queue_full(cmd, cmd->se_dev);
2145 }
07bde79a
NB		 2146}
2147
39c05f32 2148void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2149{
d14921d6 2150 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2151 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2152 transport_wait_for_tasks(cmd);
2153
35462975 2154 transport_release_cmd(cmd);
d14921d6
NB		 2155 } else {
2156 if (wait_for_tasks)
2157 transport_wait_for_tasks(cmd);
2158
c66ac9db
NB		 2159 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2160
82f1c8a4 2161 if (cmd->se_lun)
c66ac9db 2162 transport_lun_remove_cmd(cmd);
c66ac9db 2163
39c05f32 2164 transport_put_cmd(cmd);
c66ac9db
NB		 2165 }
2166}
2167EXPORT_SYMBOL(transport_generic_free_cmd);
2168
a17f091d
NB		 2169/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2170 * @se_sess: session to reference
2171 * @se_cmd: command descriptor to add
a6360785 2172 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2173 */
bc187ea6
RD		 2174static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2175 bool ack_kref)
a17f091d
NB		 2176{
2177 unsigned long flags;
bc187ea6 2178 int ret = 0;
a17f091d 2179
7481deb4 2180 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2181 /*
2182 * Add a second kref if the fabric caller is expecting to handle
2183 * fabric acknowledgement that requires two target_put_sess_cmd()
2184 * invocations before se_cmd descriptor release.
2185 */
86715569 2186 if (ack_kref == true) {
a6360785 2187 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2188 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2189 }
7481deb4 2190
a17f091d 2191 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2192 if (se_sess->sess_tearing_down) {
2193 ret = -ESHUTDOWN;
2194 goto out;
2195 }
a17f091d
NB		 2196 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2197 se_cmd->check_release = 1;
bc187ea6
RD		 2198
2199out:
a17f091d 2200 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2201 return ret;
a17f091d 2202}
a17f091d 2203
7481deb4 2204static void target_release_cmd_kref(struct kref *kref)
a17f091d 2205{
7481deb4
NB		 2206 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2207 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 2208 unsigned long flags;
2209
2210 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2211 if (list_empty(&se_cmd->se_cmd_list)) {
2212 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2213 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2214 return;
a17f091d 2215 }
a17f091d
NB		 2216 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2217 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2218 complete(&se_cmd->cmd_wait_comp);
7481deb4 2219 return;
a17f091d
NB		 2220 }
2221 list_del(&se_cmd->se_cmd_list);
2222 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2223
7481deb4
NB		 2224 se_cmd->se_tfo->release_cmd(se_cmd);
2225}
2226
2227/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2228 * @se_sess: session to reference
2229 * @se_cmd: command descriptor to drop
2230 */
2231int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2232{
2233 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2234}
2235EXPORT_SYMBOL(target_put_sess_cmd);
2236
1c7b13fe
RD		 2237/* target_sess_cmd_list_set_waiting - Flag all commands in
2238 * sess_cmd_list to complete cmd_wait_comp. Set
2239 * sess_tearing_down so no more commands are queued.
2240 * @se_sess: session to flag
a17f091d 2241 */
1c7b13fe 2242void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2243{
2244 struct se_cmd *se_cmd;
2245 unsigned long flags;
2246
a17f091d 2247 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
a17f091d 2248
1c7b13fe
RD		 2249 WARN_ON(se_sess->sess_tearing_down);
2250 se_sess->sess_tearing_down = 1;
a17f091d 2251
1c7b13fe 2252 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
a17f091d
NB		 2253 se_cmd->cmd_wait_set = 1;
2254
2255 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2256}
1c7b13fe 2257EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2258
2259/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2260 * @se_sess: session to wait for active I/O
2261 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2262 */
2263void target_wait_for_sess_cmds(
2264 struct se_session *se_sess,
2265 int wait_for_tasks)
2266{
2267 struct se_cmd *se_cmd, *tmp_cmd;
2268 bool rc = false;
2269
2270 list_for_each_entry_safe(se_cmd, tmp_cmd,
1c7b13fe 2271 &se_sess->sess_cmd_list, se_cmd_list) {
a17f091d
NB		 2272 list_del(&se_cmd->se_cmd_list);
2273
2274 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2275 " %d\n", se_cmd, se_cmd->t_state,
2276 se_cmd->se_tfo->get_cmd_state(se_cmd));
2277
2278 if (wait_for_tasks) {
2279 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2280 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2281 se_cmd->se_tfo->get_cmd_state(se_cmd));
2282
2283 rc = transport_wait_for_tasks(se_cmd);
2284
2285 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2286 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2287 se_cmd->se_tfo->get_cmd_state(se_cmd));
2288 }
2289
2290 if (!rc) {
2291 wait_for_completion(&se_cmd->cmd_wait_comp);
2292 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2293 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2294 se_cmd->se_tfo->get_cmd_state(se_cmd));
2295 }
2296
2297 se_cmd->se_tfo->release_cmd(se_cmd);
2298 }
2299}
2300EXPORT_SYMBOL(target_wait_for_sess_cmds);
2301
c66ac9db
NB		 2302/* transport_lun_wait_for_tasks():
2303 *
2304 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2305 * an struct se_lun to be successfully shutdown.
2306 */
2307static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2308{
2309 unsigned long flags;
cf572a96
CH		 2310 int ret = 0;
2311
c66ac9db
NB		 2312 /*
2313 * If the frontend has already requested this struct se_cmd to
2314 * be stopped, we can safely ignore this struct se_cmd.
2315 */
a1d8b49a 2316 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2317 if (cmd->transport_state & CMD_T_STOP) {
2318 cmd->transport_state &= ~CMD_T_LUN_STOP;
2319
2320 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2321 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2322 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2323 transport_cmd_check_stop(cmd, false);
e3d6f909 2324 return -EPERM;
c66ac9db 2325 }
7d680f3b 2326 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2327 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2328
cf572a96
CH		 2329 // XXX: audit task_flags checks.
2330 spin_lock_irqsave(&cmd->t_state_lock, flags);
2331 if ((cmd->transport_state & CMD_T_BUSY) &&
2332 (cmd->transport_state & CMD_T_SENT)) {
2333 if (!target_stop_cmd(cmd, &flags))
2334 ret++;
cf572a96 2335 }
5f41a31d 2336 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2337
785fdf70
CH		 2338 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2339 " %d\n", cmd, ret);
c66ac9db 2340 if (!ret) {
6708bb27 2341 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2342 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2343 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2344 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2345 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2346 }
c66ac9db
NB		 2347
2348 return 0;
2349}
2350
c66ac9db
NB		 2351static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2352{
2353 struct se_cmd *cmd = NULL;
2354 unsigned long lun_flags, cmd_flags;
2355 /*
2356 * Do exception processing and return CHECK_CONDITION status to the
2357 * Initiator Port.
2358 */
2359 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2360 while (!list_empty(&lun->lun_cmd_list)) {
2361 cmd = list_first_entry(&lun->lun_cmd_list,
2362 struct se_cmd, se_lun_node);
3d26fea0 2363 list_del_init(&cmd->se_lun_node);
5951146d 2364
a1d8b49a 2365 spin_lock(&cmd->t_state_lock);
6708bb27 2366 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2367 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2368 cmd->se_lun->unpacked_lun,
2369 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2370 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2371 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2372
2373 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2374
6708bb27
AG		 2375 if (!cmd->se_lun) {
2376 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2377 cmd->se_tfo->get_task_tag(cmd),
2378 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2379 BUG();
2380 }
2381 /*
2382 * If the Storage engine still owns the iscsi_cmd_t, determine
2383 * and/or stop its context.
2384 */
6708bb27 2385 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2386 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2387 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2388
e3d6f909 2389 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2390 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2391 continue;
2392 }
2393
6708bb27 2394 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2395 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2396 cmd->se_lun->unpacked_lun,
2397 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2398
a1d8b49a 2399 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2400 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2401 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2402 goto check_cond;
2403 }
7d680f3b 2404 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2405 target_remove_from_state_list(cmd);
a1d8b49a 2406 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2407
c66ac9db
NB		 2408 /*
2409 * The Storage engine stopped this struct se_cmd before it was
2410 * send to the fabric frontend for delivery back to the
2411 * Initiator Node. Return this SCSI CDB back with an
2412 * CHECK_CONDITION status.
2413 */
2414check_cond:
2415 transport_send_check_condition_and_sense(cmd,
2416 TCM_NON_EXISTENT_LUN, 0);
2417 /*
2418 * If the fabric frontend is waiting for this iscsi_cmd_t to
2419 * be released, notify the waiting thread now that LU has
2420 * finished accessing it.
2421 */
a1d8b49a 2422 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2423 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2424 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2425 " struct se_cmd: %p ITT: 0x%08x\n",
2426 lun->unpacked_lun,
e3d6f909 2427 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2428
a1d8b49a 2429 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2430 cmd_flags);
f7113a47 2431 transport_cmd_check_stop(cmd, false);
a1d8b49a 2432 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2433 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2434 continue;
2435 }
6708bb27 2436 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2437 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2438
a1d8b49a 2439 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2440 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2441 }
2442 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2443}
2444
2445static int transport_clear_lun_thread(void *p)
2446{
8359cf43 2447 struct se_lun *lun = p;
c66ac9db
NB		 2448
2449 __transport_clear_lun_from_sessions(lun);
2450 complete(&lun->lun_shutdown_comp);
2451
2452 return 0;
2453}
2454
2455int transport_clear_lun_from_sessions(struct se_lun *lun)
2456{
2457 struct task_struct *kt;
2458
5951146d 2459 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2460 "tcm_cl_%u", lun->unpacked_lun);
2461 if (IS_ERR(kt)) {
6708bb27 2462 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2463 return PTR_ERR(kt);
c66ac9db
NB		 2464 }
2465 wait_for_completion(&lun->lun_shutdown_comp);
2466
2467 return 0;
2468}
2469
d14921d6
NB		 2470/**
2471 * transport_wait_for_tasks - wait for completion to occur
2472 * @cmd: command to wait
c66ac9db 2473 *
d14921d6
NB		 2474 * Called from frontend fabric context to wait for storage engine
2475 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2476 */
a17f091d 2477bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2478{
2479 unsigned long flags;
2480
a1d8b49a 2481 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2482 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2483 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2484 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2485 return false;
d14921d6 2486 }
cb4f4d3c 2487
c8e31f26
AG		 2488 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2489 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2490 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2491 return false;
d14921d6 2492 }
c66ac9db
NB		 2493 /*
2494 * If we are already stopped due to an external event (ie: LUN shutdown)
2495 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2496 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2497 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2498 * has completed its operation on the struct se_cmd.
2499 */
7d680f3b 2500 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2501 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2502 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2503 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2504 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2505 /*
2506 * There is a special case for WRITES where a FE exception +
2507 * LUN shutdown means ConfigFS context is still sleeping on
2508 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2509 * We go ahead and up transport_lun_stop_comp just to be sure
2510 * here.
2511 */
a1d8b49a
AG		 2512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2513 complete(&cmd->transport_lun_stop_comp);
2514 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2515 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2516
cf572a96 2517 target_remove_from_state_list(cmd);
c66ac9db
NB		 2518 /*
2519 * At this point, the frontend who was the originator of this
2520 * struct se_cmd, now owns the structure and can be released through
2521 * normal means below.
2522 */
6708bb27 2523 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2524 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2525 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2526 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2527
7d680f3b 2528 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2529 }
7d680f3b 2530
3d28934a 2531 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2532 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2533 return false;
d14921d6 2534 }
c66ac9db 2535
7d680f3b 2536 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2537
6708bb27 2538 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2539 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2540 cmd, cmd->se_tfo->get_task_tag(cmd),
2541 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2542
a1d8b49a 2543 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2544
a1d8b49a 2545 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2546
a1d8b49a 2547 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2548 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2549
35d1efe8 2550 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2551 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2552 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2553
d14921d6 2554 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2555
2556 return true;
c66ac9db 2557}
d14921d6 2558EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2559
2560static int transport_get_sense_codes(
2561 struct se_cmd *cmd,
2562 u8 *asc,
2563 u8 *ascq)
2564{
2565 *asc = cmd->scsi_asc;
2566 *ascq = cmd->scsi_ascq;
2567
2568 return 0;
2569}
2570
de103c93
CH		 2571int
2572transport_send_check_condition_and_sense(struct se_cmd *cmd,
2573 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2574{
2575 unsigned char *buffer = cmd->sense_buffer;
2576 unsigned long flags;
c66ac9db
NB		 2577 u8 asc = 0, ascq = 0;
2578
a1d8b49a 2579 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2580 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2581 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2582 return 0;
2583 }
2584 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2585 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2586
2587 if (!reason && from_transport)
2588 goto after_reason;
2589
2590 if (!from_transport)
2591 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2592
c66ac9db
NB		 2593 /*
2594 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2595 * SENSE KEY values from include/scsi/scsi.h
2596 */
2597 switch (reason) {
ba829137
HR		 2598 case TCM_NO_SENSE:
2599 /* CURRENT ERROR */
2600 buffer[0] = 0x70;
2601 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2602 /* Not Ready */
2603 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2604 /* NO ADDITIONAL SENSE INFORMATION */
2605 buffer[SPC_ASC_KEY_OFFSET] = 0;
2606 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2607 break;
c66ac9db 2608 case TCM_NON_EXISTENT_LUN:
eb39d340 2609 /* CURRENT ERROR */
9c58b7dd
RD		 2610 buffer[0] = 0x70;
2611 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2612 /* ILLEGAL REQUEST */
9c58b7dd 2613 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2614 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2615 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2616 break;
c66ac9db
NB		 2617 case TCM_UNSUPPORTED_SCSI_OPCODE:
2618 case TCM_SECTOR_COUNT_TOO_MANY:
2619 /* CURRENT ERROR */
9c58b7dd
RD		 2620 buffer[0] = 0x70;
2621 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2622 /* ILLEGAL REQUEST */
9c58b7dd 2623 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2624 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2625 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2626 break;
2627 case TCM_UNKNOWN_MODE_PAGE:
2628 /* CURRENT ERROR */
9c58b7dd
RD		 2629 buffer[0] = 0x70;
2630 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2631 /* ILLEGAL REQUEST */
9c58b7dd 2632 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2633 /* INVALID FIELD IN CDB */
9c58b7dd 2634 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2635 break;
2636 case TCM_CHECK_CONDITION_ABORT_CMD:
2637 /* CURRENT ERROR */
9c58b7dd
RD		 2638 buffer[0] = 0x70;
2639 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2640 /* ABORTED COMMAND */
9c58b7dd 2641 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2642 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2643 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2644 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2645 break;
2646 case TCM_INCORRECT_AMOUNT_OF_DATA:
2647 /* CURRENT ERROR */
9c58b7dd
RD		 2648 buffer[0] = 0x70;
2649 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2650 /* ABORTED COMMAND */
9c58b7dd 2651 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2652 /* WRITE ERROR */
9c58b7dd 2653 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2654 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2655 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2656 break;
2657 case TCM_INVALID_CDB_FIELD:
2658 /* CURRENT ERROR */
9c58b7dd
RD		 2659 buffer[0] = 0x70;
2660 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2661 /* ILLEGAL REQUEST */
9c58b7dd 2662 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2663 /* INVALID FIELD IN CDB */
9c58b7dd 2664 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2665 break;
2666 case TCM_INVALID_PARAMETER_LIST:
2667 /* CURRENT ERROR */
9c58b7dd
RD		 2668 buffer[0] = 0x70;
2669 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2670 /* ILLEGAL REQUEST */
9c58b7dd 2671 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2672 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2673 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db
NB		 2674 break;
2675 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2676 /* CURRENT ERROR */
9c58b7dd
RD		 2677 buffer[0] = 0x70;
2678 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2679 /* ABORTED COMMAND */
9c58b7dd 2680 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2681 /* WRITE ERROR */
9c58b7dd 2682 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2683 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2684 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2685 break;
2686 case TCM_SERVICE_CRC_ERROR:
2687 /* CURRENT ERROR */
9c58b7dd
RD		 2688 buffer[0] = 0x70;
2689 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2690 /* ABORTED COMMAND */
9c58b7dd 2691 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2692 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2693 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2694 /* N/A */
9c58b7dd 2695 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2696 break;
2697 case TCM_SNACK_REJECTED:
2698 /* CURRENT ERROR */
9c58b7dd
RD		 2699 buffer[0] = 0x70;
2700 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2701 /* ABORTED COMMAND */
9c58b7dd 2702 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2703 /* READ ERROR */
9c58b7dd 2704 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2705 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2706 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2707 break;
2708 case TCM_WRITE_PROTECTED:
2709 /* CURRENT ERROR */
9c58b7dd
RD		 2710 buffer[0] = 0x70;
2711 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2712 /* DATA PROTECT */
9c58b7dd 2713 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2714 /* WRITE PROTECTED */
9c58b7dd 2715 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2716 break;
e2397c70
RD		 2717 case TCM_ADDRESS_OUT_OF_RANGE:
2718 /* CURRENT ERROR */
9c58b7dd
RD		 2719 buffer[0] = 0x70;
2720 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2721 /* ILLEGAL REQUEST */
9c58b7dd 2722 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2723 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2724 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2725 break;
c66ac9db
NB		 2726 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2727 /* CURRENT ERROR */
9c58b7dd
RD		 2728 buffer[0] = 0x70;
2729 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2730 /* UNIT ATTENTION */
9c58b7dd 2731 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2732 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2733 buffer[SPC_ASC_KEY_OFFSET] = asc;
2734 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2735 break;
2736 case TCM_CHECK_CONDITION_NOT_READY:
2737 /* CURRENT ERROR */
9c58b7dd
RD		 2738 buffer[0] = 0x70;
2739 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2740 /* Not Ready */
9c58b7dd 2741 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2742 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2743 buffer[SPC_ASC_KEY_OFFSET] = asc;
2744 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2745 break;
2746 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2747 default:
2748 /* CURRENT ERROR */
9c58b7dd
RD		 2749 buffer[0] = 0x70;
2750 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2751 /* ILLEGAL REQUEST */
9c58b7dd 2752 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2753 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2754 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2755 break;
2756 }
2757 /*
2758 * This code uses linux/include/scsi/scsi.h SAM status codes!
2759 */
2760 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2761 /*
2762 * Automatically padded, this value is encoded in the fabric's
2763 * data_length response PDU containing the SCSI defined sense data.
2764 */
9c58b7dd 2765 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2766
2767after_reason:
07bde79a 2768 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2769}
2770EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2771
2772int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2773{
c18bc7d8
RD		 2774 if (!(cmd->transport_state & CMD_T_ABORTED))
2775 return 0;
c66ac9db 2776
c18bc7d8
RD		 2777 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2778 return 1;
8b1e1244 2779
c18bc7d8
RD		 2780 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2781 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2782
c18bc7d8
RD		 2783 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
2784 cmd->se_tfo->queue_status(cmd);
2785
2786 return 1;
c66ac9db
NB		 2787}
2788EXPORT_SYMBOL(transport_check_aborted_status);
2789
2790void transport_send_task_abort(struct se_cmd *cmd)
2791{
c252f003
NB		 2792 unsigned long flags;
2793
2794 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2795 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2796 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2797 return;
2798 }
2799 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2800
c66ac9db
NB		 2801 /*
2802 * If there are still expected incoming fabric WRITEs, we wait
2803 * until until they have completed before sending a TASK_ABORTED
2804 * response. This response with TASK_ABORTED status will be
2805 * queued back to fabric module by transport_check_aborted_status().
2806 */
2807 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2808 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2809 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2810 smp_mb__after_atomic_inc();
c66ac9db
NB		 2811 }
2812 }
2813 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2814
72b59d6e
RD		 2815 transport_lun_remove_cmd(cmd);
2816
6708bb27 2817 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2818 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2819 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2820
e3d6f909 2821 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2822}
2823
af877292 2824static void target_tmr_work(struct work_struct *work)
c66ac9db 2825{
af877292 2826 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2827 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2828 struct se_tmr_req *tmr = cmd->se_tmr_req;
2829 int ret;
2830
2831 switch (tmr->function) {
5c6cd613 2832 case TMR_ABORT_TASK:
3d28934a 2833 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2834 break;
5c6cd613
NB		 2835 case TMR_ABORT_TASK_SET:
2836 case TMR_CLEAR_ACA:
2837 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2838 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2839 break;
5c6cd613 2840 case TMR_LUN_RESET:
c66ac9db
NB		 2841 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2842 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2843 TMR_FUNCTION_REJECTED;
2844 break;
5c6cd613 2845 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2846 tmr->response = TMR_FUNCTION_REJECTED;
2847 break;
5c6cd613 2848 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2849 tmr->response = TMR_FUNCTION_REJECTED;
2850 break;
c66ac9db 2851 default:
6708bb27 2852 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2853 tmr->function);
2854 tmr->response = TMR_FUNCTION_REJECTED;
2855 break;
2856 }
2857
2858 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2859 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2860
b7b8bef7 2861 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2862}
2863
af877292
CH		 2864int transport_generic_handle_tmr(
2865 struct se_cmd *cmd)
c66ac9db 2866{
af877292
CH		 2867 INIT_WORK(&cmd->work, target_tmr_work);
2868 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2869 return 0;
2870}
af877292 2871EXPORT_SYMBOL(transport_generic_handle_tmr);
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