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target: Fix missing CMD_T_ACTIVE bit regression for pending WRITEs
[mirror_ubuntu-focal-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{
c8e31f26 544 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
8dc52b54 545 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 546
547 if (transport_cmd_check_stop_to_fabric(cmd))
548 return;
af877292 549 if (remove)
e6a2573f 550 transport_put_cmd(cmd);
c66ac9db
NB		 551}
552
35e0e757
CH		 553static void target_complete_failure_work(struct work_struct *work)
554{
555 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
556
de103c93
CH		 557 transport_generic_request_failure(cmd,
558 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 559}
560
6138ed2a 561/*
d5829eac
PB		 562 * Used when asking transport to copy Sense Data from the underlying
563 * Linux/SCSI struct scsi_cmnd
6138ed2a 564 */
d5829eac 565static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 566{
6138ed2a 567 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 568
569 WARN_ON(!cmd->se_lun);
570
571 if (!dev)
d5829eac 572 return NULL;
6138ed2a 573
d5829eac
PB		 574 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
575 return NULL;
6138ed2a 576
9c58b7dd 577 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 578
d5829eac 579 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 580 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 581 return cmd->sense_buffer;
6138ed2a
PB		 582}
583
5787cacd 584void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 585{
42bf829e 586 struct se_device *dev = cmd->se_dev;
5787cacd 587 int success = scsi_status == GOOD;
c66ac9db 588 unsigned long flags;
c66ac9db 589
5787cacd
CH		 590 cmd->scsi_status = scsi_status;
591
592
a1d8b49a 593 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 594 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 595
c66ac9db 596 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 597 dev->transport->transport_complete(cmd,
598 cmd->t_data_sg,
599 transport_get_sense_buffer(cmd));
600 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 601 success = 1;
c66ac9db
NB		 602 }
603
604 /*
5787cacd 605 * See if we are waiting to complete for an exception condition.
c66ac9db 606 */
cf572a96 607 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 608 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 609 complete(&cmd->task_stop_comp);
c66ac9db
NB		 610 return;
611 }
2235007c
CH		 612
613 if (!success)
7d680f3b 614 cmd->transport_state |= CMD_T_FAILED;
2235007c 615
3d28934a
NB		 616 /*
617 * Check for case where an explict ABORT_TASK has been received
618 * and transport_wait_for_tasks() will be waiting for completion..
619 */
620 if (cmd->transport_state & CMD_T_ABORTED &&
621 cmd->transport_state & CMD_T_STOP) {
622 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
623 complete(&cmd->t_transport_stop_comp);
624 return;
625 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 626 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 627 } else {
35e0e757 628 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 629 }
35e0e757 630
35e0e757 631 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 632 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 633 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 634
35e0e757 635 queue_work(target_completion_wq, &cmd->work);
c66ac9db 636}
6bb35e00
CH		 637EXPORT_SYMBOL(target_complete_cmd);
638
cf572a96 639static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 640{
cf572a96
CH		 641 struct se_device *dev = cmd->se_dev;
642 unsigned long flags;
c66ac9db 643
cf572a96
CH		 644 spin_lock_irqsave(&dev->execute_task_lock, flags);
645 if (!cmd->state_active) {
646 list_add_tail(&cmd->state_list, &dev->state_list);
647 cmd->state_active = true;
c66ac9db 648 }
cf572a96 649 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 650}
651
07bde79a 652/*
f147abb4 653 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 654 */
7a6f0a1e
CH		 655static void transport_write_pending_qf(struct se_cmd *cmd);
656static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 657
0fd97ccf 658void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 659{
660 struct se_device *dev = container_of(work, struct se_device,
661 qf_work_queue);
bcac364a 662 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 663 struct se_cmd *cmd, *cmd_tmp;
664
665 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 666 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
667 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 668
bcac364a 669 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 670 list_del(&cmd->se_qf_node);
671 atomic_dec(&dev->dev_qf_count);
672 smp_mb__after_atomic_dec();
07bde79a 673
6708bb27 674 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 675 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 676 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 677 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
678 : "UNKNOWN");
f7a5cc0b 679
7a6f0a1e
CH		 680 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
681 transport_write_pending_qf(cmd);
682 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
683 transport_complete_qf(cmd);
07bde79a 684 }
07bde79a
NB		 685}
686
c66ac9db
NB		 687unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
688{
689 switch (cmd->data_direction) {
690 case DMA_NONE:
691 return "NONE";
692 case DMA_FROM_DEVICE:
693 return "READ";
694 case DMA_TO_DEVICE:
695 return "WRITE";
696 case DMA_BIDIRECTIONAL:
697 return "BIDI";
698 default:
699 break;
700 }
701
702 return "UNKNOWN";
703}
704
705void transport_dump_dev_state(
706 struct se_device *dev,
707 char *b,
708 int *bl)
709{
710 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 711 if (dev->export_count)
c66ac9db 712 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 713 else
c66ac9db 714 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 715
5f41a31d 716 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 717 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 718 dev->dev_attrib.block_size,
719 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 720 *bl += sprintf(b + *bl, " ");
721}
722
c66ac9db
NB		 723void transport_dump_vpd_proto_id(
724 struct t10_vpd *vpd,
725 unsigned char *p_buf,
726 int p_buf_len)
727{
728 unsigned char buf[VPD_TMP_BUF_SIZE];
729 int len;
730
731 memset(buf, 0, VPD_TMP_BUF_SIZE);
732 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
733
734 switch (vpd->protocol_identifier) {
735 case 0x00:
736 sprintf(buf+len, "Fibre Channel\n");
737 break;
738 case 0x10:
739 sprintf(buf+len, "Parallel SCSI\n");
740 break;
741 case 0x20:
742 sprintf(buf+len, "SSA\n");
743 break;
744 case 0x30:
745 sprintf(buf+len, "IEEE 1394\n");
746 break;
747 case 0x40:
748 sprintf(buf+len, "SCSI Remote Direct Memory Access"
749 " Protocol\n");
750 break;
751 case 0x50:
752 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
753 break;
754 case 0x60:
755 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
756 break;
757 case 0x70:
758 sprintf(buf+len, "Automation/Drive Interface Transport"
759 " Protocol\n");
760 break;
761 case 0x80:
762 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
763 break;
764 default:
765 sprintf(buf+len, "Unknown 0x%02x\n",
766 vpd->protocol_identifier);
767 break;
768 }
769
770 if (p_buf)
771 strncpy(p_buf, buf, p_buf_len);
772 else
6708bb27 773 pr_debug("%s", buf);
c66ac9db
NB		 774}
775
776void
777transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
778{
779 /*
780 * Check if the Protocol Identifier Valid (PIV) bit is set..
781 *
782 * from spc3r23.pdf section 7.5.1
783 */
784 if (page_83[1] & 0x80) {
785 vpd->protocol_identifier = (page_83[0] & 0xf0);
786 vpd->protocol_identifier_set = 1;
787 transport_dump_vpd_proto_id(vpd, NULL, 0);
788 }
789}
790EXPORT_SYMBOL(transport_set_vpd_proto_id);
791
792int transport_dump_vpd_assoc(
793 struct t10_vpd *vpd,
794 unsigned char *p_buf,
795 int p_buf_len)
796{
797 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 798 int ret = 0;
799 int len;
c66ac9db
NB		 800
801 memset(buf, 0, VPD_TMP_BUF_SIZE);
802 len = sprintf(buf, "T10 VPD Identifier Association: ");
803
804 switch (vpd->association) {
805 case 0x00:
806 sprintf(buf+len, "addressed logical unit\n");
807 break;
808 case 0x10:
809 sprintf(buf+len, "target port\n");
810 break;
811 case 0x20:
812 sprintf(buf+len, "SCSI target device\n");
813 break;
814 default:
815 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 816 ret = -EINVAL;
c66ac9db
NB		 817 break;
818 }
819
820 if (p_buf)
821 strncpy(p_buf, buf, p_buf_len);
822 else
6708bb27 823 pr_debug("%s", buf);
c66ac9db
NB		 824
825 return ret;
826}
827
828int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
829{
830 /*
831 * The VPD identification association..
832 *
833 * from spc3r23.pdf Section 7.6.3.1 Table 297
834 */
835 vpd->association = (page_83[1] & 0x30);
836 return transport_dump_vpd_assoc(vpd, NULL, 0);
837}
838EXPORT_SYMBOL(transport_set_vpd_assoc);
839
840int transport_dump_vpd_ident_type(
841 struct t10_vpd *vpd,
842 unsigned char *p_buf,
843 int p_buf_len)
844{
845 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 846 int ret = 0;
847 int len;
c66ac9db
NB		 848
849 memset(buf, 0, VPD_TMP_BUF_SIZE);
850 len = sprintf(buf, "T10 VPD Identifier Type: ");
851
852 switch (vpd->device_identifier_type) {
853 case 0x00:
854 sprintf(buf+len, "Vendor specific\n");
855 break;
856 case 0x01:
857 sprintf(buf+len, "T10 Vendor ID based\n");
858 break;
859 case 0x02:
860 sprintf(buf+len, "EUI-64 based\n");
861 break;
862 case 0x03:
863 sprintf(buf+len, "NAA\n");
864 break;
865 case 0x04:
866 sprintf(buf+len, "Relative target port identifier\n");
867 break;
868 case 0x08:
869 sprintf(buf+len, "SCSI name string\n");
870 break;
871 default:
872 sprintf(buf+len, "Unsupported: 0x%02x\n",
873 vpd->device_identifier_type);
e3d6f909 874 ret = -EINVAL;
c66ac9db
NB		 875 break;
876 }
877
e3d6f909
AG		 878 if (p_buf) {
879 if (p_buf_len < strlen(buf)+1)
880 return -EINVAL;
c66ac9db 881 strncpy(p_buf, buf, p_buf_len);
e3d6f909 882 } else {
6708bb27 883 pr_debug("%s", buf);
e3d6f909 884 }
c66ac9db
NB		 885
886 return ret;
887}
888
889int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
890{
891 /*
892 * The VPD identifier type..
893 *
894 * from spc3r23.pdf Section 7.6.3.1 Table 298
895 */
896 vpd->device_identifier_type = (page_83[1] & 0x0f);
897 return transport_dump_vpd_ident_type(vpd, NULL, 0);
898}
899EXPORT_SYMBOL(transport_set_vpd_ident_type);
900
901int transport_dump_vpd_ident(
902 struct t10_vpd *vpd,
903 unsigned char *p_buf,
904 int p_buf_len)
905{
906 unsigned char buf[VPD_TMP_BUF_SIZE];
907 int ret = 0;
908
909 memset(buf, 0, VPD_TMP_BUF_SIZE);
910
911 switch (vpd->device_identifier_code_set) {
912 case 0x01: /* Binary */
913 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
914 &vpd->device_identifier[0]);
915 break;
916 case 0x02: /* ASCII */
917 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
918 &vpd->device_identifier[0]);
919 break;
920 case 0x03: /* UTF-8 */
921 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
922 &vpd->device_identifier[0]);
923 break;
924 default:
925 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
926 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 927 ret = -EINVAL;
c66ac9db
NB		 928 break;
929 }
930
931 if (p_buf)
932 strncpy(p_buf, buf, p_buf_len);
933 else
6708bb27 934 pr_debug("%s", buf);
c66ac9db
NB		 935
936 return ret;
937}
938
939int
940transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
941{
942 static const char hex_str[] = "0123456789abcdef";
35d1efe8 943 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 944
945 /*
946 * The VPD Code Set (encoding)
947 *
948 * from spc3r23.pdf Section 7.6.3.1 Table 296
949 */
950 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
951 switch (vpd->device_identifier_code_set) {
952 case 0x01: /* Binary */
953 vpd->device_identifier[j++] =
954 hex_str[vpd->device_identifier_type];
955 while (i < (4 + page_83[3])) {
956 vpd->device_identifier[j++] =
957 hex_str[(page_83[i] & 0xf0) >> 4];
958 vpd->device_identifier[j++] =
959 hex_str[page_83[i] & 0x0f];
960 i++;
961 }
962 break;
963 case 0x02: /* ASCII */
964 case 0x03: /* UTF-8 */
965 while (i < (4 + page_83[3]))
966 vpd->device_identifier[j++] = page_83[i++];
967 break;
968 default:
969 break;
970 }
971
972 return transport_dump_vpd_ident(vpd, NULL, 0);
973}
974EXPORT_SYMBOL(transport_set_vpd_ident);
975
de103c93
CH		 976sense_reason_t
977target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 978{
979 struct se_device *dev = cmd->se_dev;
980
981 if (cmd->unknown_data_length) {
982 cmd->data_length = size;
983 } else if (size != cmd->data_length) {
984 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
985 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
986 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
987 cmd->data_length, size, cmd->t_task_cdb[0]);
988
9b3b8041
CH		 989 if (cmd->data_direction == DMA_TO_DEVICE) {
990 pr_err("Rejecting underflow/overflow"
991 " WRITE data\n");
de103c93 992 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 993 }
994 /*
995 * Reject READ_* or WRITE_* with overflow/underflow for
996 * type SCF_SCSI_DATA_CDB.
997 */
0fd97ccf 998 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 999 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1000 " CDB on non 512-byte sector setup subsystem"
1001 " plugin: %s\n", dev->transport->name);
1002 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1003 return TCM_INVALID_CDB_FIELD;
9b3b8041 1004 }
4c054ba6
NB		 1005 /*
1006 * For the overflow case keep the existing fabric provided
1007 * ->data_length. Otherwise for the underflow case, reset
1008 * ->data_length to the smaller SCSI expected data transfer
1009 * length.
1010 */
9b3b8041
CH		 1011 if (size > cmd->data_length) {
1012 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1013 cmd->residual_count = (size - cmd->data_length);
1014 } else {
1015 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1016 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1017 cmd->data_length = size;
9b3b8041 1018 }
9b3b8041
CH		 1019 }
1020
1021 return 0;
1022
9b3b8041
CH		 1023}
1024
c66ac9db
NB		 1025/*
1026 * Used by fabric modules containing a local struct se_cmd within their
1027 * fabric dependent per I/O descriptor.
1028 */
1029void transport_init_se_cmd(
1030 struct se_cmd *cmd,
1031 struct target_core_fabric_ops *tfo,
1032 struct se_session *se_sess,
1033 u32 data_length,
1034 int data_direction,
1035 int task_attr,
1036 unsigned char *sense_buffer)
1037{
5951146d
AG		 1038 INIT_LIST_HEAD(&cmd->se_lun_node);
1039 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1040 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1041 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1042 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1043 init_completion(&cmd->transport_lun_fe_stop_comp);
1044 init_completion(&cmd->transport_lun_stop_comp);
1045 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1046 init_completion(&cmd->cmd_wait_comp);
cf572a96 1047 init_completion(&cmd->task_stop_comp);
a1d8b49a 1048 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1049 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1050
1051 cmd->se_tfo = tfo;
1052 cmd->se_sess = se_sess;
1053 cmd->data_length = data_length;
1054 cmd->data_direction = data_direction;
1055 cmd->sam_task_attr = task_attr;
1056 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1057
1058 cmd->state_active = false;
c66ac9db
NB		 1059}
1060EXPORT_SYMBOL(transport_init_se_cmd);
1061
de103c93
CH		 1062static sense_reason_t
1063transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1064{
019c4ca6
CH		 1065 struct se_device *dev = cmd->se_dev;
1066
c66ac9db
NB		 1067 /*
1068 * Check if SAM Task Attribute emulation is enabled for this
1069 * struct se_device storage object
1070 */
019c4ca6 1071 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1072 return 0;
1073
e66ecd50 1074 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1075 pr_debug("SAM Task Attribute ACA"
c66ac9db 1076 " emulation is not supported\n");
de103c93 1077 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1078 }
1079 /*
1080 * Used to determine when ORDERED commands should go from
1081 * Dormant to Active status.
1082 */
019c4ca6 1083 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1084 smp_mb__after_atomic_inc();
6708bb27 1085 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1086 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1087 dev->transport->name);
c66ac9db
NB		 1088 return 0;
1089}
1090
de103c93
CH		 1091sense_reason_t
1092target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1093{
0fd97ccf 1094 struct se_device *dev = cmd->se_dev;
cb4f4d3c 1095 unsigned long flags;
de103c93 1096 sense_reason_t ret;
c66ac9db 1097
c66ac9db
NB		 1098 /*
1099 * Ensure that the received CDB is less than the max (252 + 8) bytes
1100 * for VARIABLE_LENGTH_CMD
1101 */
1102 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1103 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1104 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1105 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1106 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1107 }
1108 /*
1109 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1110 * allocate the additional extended CDB buffer now.. Otherwise
1111 * setup the pointer from __t_task_cdb to t_task_cdb.
1112 */
a1d8b49a
AG		 1113 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1114 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1115 GFP_KERNEL);
6708bb27
AG		 1116 if (!cmd->t_task_cdb) {
1117 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1118 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1119 scsi_command_size(cdb),
a1d8b49a 1120 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1121 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1122 }
1123 } else
a1d8b49a 1124 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1125 /*
a1d8b49a 1126 * Copy the original CDB into cmd->
c66ac9db 1127 */
a1d8b49a 1128 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1129
1130 /*
1131 * Check for an existing UNIT ATTENTION condition
1132 */
de103c93
CH		 1133 ret = target_scsi3_ua_check(cmd);
1134 if (ret)
1135 return ret;
cb4f4d3c 1136
c87fbd56 1137 ret = target_alua_state_check(cmd);
de103c93
CH		 1138 if (ret)
1139 return ret;
cb4f4d3c 1140
d977f437 1141 ret = target_check_reservation(cmd);
de103c93 1142 if (ret)
d977f437 1143 return ret;
cb4f4d3c 1144
0fd97ccf 1145 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1146 if (ret)
1147 return ret;
1148
1149 ret = transport_check_alloc_task_attr(cmd);
1150 if (ret)
c66ac9db 1151 return ret;
cb4f4d3c
CH		 1152
1153 spin_lock_irqsave(&cmd->t_state_lock, flags);
1154 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1155 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1156
c66ac9db
NB		 1157 spin_lock(&cmd->se_lun->lun_sep_lock);
1158 if (cmd->se_lun->lun_sep)
1159 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1160 spin_unlock(&cmd->se_lun->lun_sep_lock);
1161 return 0;
1162}
a12f41f8 1163EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1164
695434e1
NB		 1165/*
1166 * Used by fabric module frontends to queue tasks directly.
1167 * Many only be used from process context only
1168 */
1169int transport_handle_cdb_direct(
1170 struct se_cmd *cmd)
1171{
de103c93 1172 sense_reason_t ret;
dd8ae59d 1173
695434e1
NB		 1174 if (!cmd->se_lun) {
1175 dump_stack();
6708bb27 1176 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1177 return -EINVAL;
1178 }
1179 if (in_interrupt()) {
1180 dump_stack();
6708bb27 1181 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1182 " from interrupt context\n");
1183 return -EINVAL;
1184 }
dd8ae59d 1185 /*
af877292
CH		 1186 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1187 * outstanding descriptors are handled correctly during shutdown via
1188 * transport_wait_for_tasks()
dd8ae59d
NB		 1189 *
1190 * Also, we don't take cmd->t_state_lock here as we only expect
1191 * this to be called for initial descriptor submission.
1192 */
1193 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1194 cmd->transport_state |= CMD_T_ACTIVE;
1195
dd8ae59d
NB		 1196 /*
1197 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1198 * so follow TRANSPORT_NEW_CMD processing thread context usage
1199 * and call transport_generic_request_failure() if necessary..
1200 */
1201 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1202 if (ret)
1203 transport_generic_request_failure(cmd, ret);
dd8ae59d 1204 return 0;
695434e1
NB		 1205}
1206EXPORT_SYMBOL(transport_handle_cdb_direct);
1207
de103c93
CH		 1208static sense_reason_t
1209transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1210 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1211{
1212 if (!sgl || !sgl_count)
1213 return 0;
1214
1215 /*
1216 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1217 * scatterlists already have been set to follow what the fabric
1218 * passes for the original expected data transfer length.
1219 */
1220 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1221 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1222 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1223 return TCM_INVALID_CDB_FIELD;
1224 }
1225
1226 cmd->t_data_sg = sgl;
1227 cmd->t_data_nents = sgl_count;
1228
1229 if (sgl_bidi && sgl_bidi_count) {
1230 cmd->t_bidi_data_sg = sgl_bidi;
1231 cmd->t_bidi_data_nents = sgl_bidi_count;
1232 }
1233 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1234 return 0;
1235}
1236
a026757f
NB		 1237/*
1238 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1239 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1240 *
1241 * @se_cmd: command descriptor to submit
1242 * @se_sess: associated se_sess for endpoint
1243 * @cdb: pointer to SCSI CDB
1244 * @sense: pointer to SCSI sense buffer
1245 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1246 * @data_length: fabric expected data transfer length
1247 * @task_addr: SAM task attribute
1248 * @data_dir: DMA data direction
1249 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1250 * @sgl: struct scatterlist memory for unidirectional mapping
1251 * @sgl_count: scatterlist count for unidirectional mapping
1252 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1253 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1254 *
d6dfc868
RD		 1255 * Returns non zero to signal active I/O shutdown failure. All other
1256 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1257 * but still return zero here.
1258 *
a6360785
NB		 1259 * This may only be called from process context, and also currently
1260 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1261 */
1262int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1263 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1264 u32 data_length, int task_attr, int data_dir, int flags,
1265 struct scatterlist *sgl, u32 sgl_count,
1266 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1267{
1268 struct se_portal_group *se_tpg;
de103c93
CH		 1269 sense_reason_t rc;
1270 int ret;
a6360785
NB		 1271
1272 se_tpg = se_sess->se_tpg;
1273 BUG_ON(!se_tpg);
1274 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1275 BUG_ON(in_interrupt());
1276 /*
1277 * Initialize se_cmd for target operation. From this point
1278 * exceptions are handled by sending exception status via
1279 * target_core_fabric_ops->queue_status() callback
1280 */
1281 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1282 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1283 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1284 se_cmd->unknown_data_length = 1;
a6360785
NB		 1285 /*
1286 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1287 * se_sess->sess_cmd_list. A second kref_get here is necessary
1288 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1289 * kref_put() to happen during fabric packet acknowledgement.
1290 */
de103c93
CH		 1291 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1292 if (ret)
1293 return ret;
a6360785
NB		 1294 /*
1295 * Signal bidirectional data payloads to target-core
1296 */
1297 if (flags & TARGET_SCF_BIDI_OP)
1298 se_cmd->se_cmd_flags |= SCF_BIDI;
1299 /*
1300 * Locate se_lun pointer and attach it to struct se_cmd
1301 */
de103c93
CH		 1302 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1303 if (rc) {
1304 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1305 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1306 return 0;
735703ca 1307 }
d6e0175c 1308
a12f41f8 1309 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1310 if (rc != 0) {
de103c93 1311 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1312 return 0;
735703ca 1313 }
a026757f
NB		 1314 /*
1315 * When a non zero sgl_count has been passed perform SGL passthrough
1316 * mapping for pre-allocated fabric memory instead of having target
1317 * core perform an internal SGL allocation..
1318 */
1319 if (sgl_count != 0) {
1320 BUG_ON(!sgl);
1321
944981c7
NB		 1322 /*
1323 * A work-around for tcm_loop as some userspace code via
1324 * scsi-generic do not memset their associated read buffers,
1325 * so go ahead and do that here for type non-data CDBs. Also
1326 * note that this is currently guaranteed to be a single SGL
1327 * for this case by target core in target_setup_cmd_from_cdb()
1328 * -> transport_generic_cmd_sequencer().
1329 */
1330 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1331 se_cmd->data_direction == DMA_FROM_DEVICE) {
1332 unsigned char *buf = NULL;
1333
1334 if (sgl)
1335 buf = kmap(sg_page(sgl)) + sgl->offset;
1336
1337 if (buf) {
1338 memset(buf, 0, sgl->length);
1339 kunmap(sg_page(sgl));
1340 }
1341 }
1342
a026757f
NB		 1343 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1344 sgl_bidi, sgl_bidi_count);
1345 if (rc != 0) {
de103c93 1346 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1347 return 0;
1348 }
1349 }
11e319ed
AG		 1350 /*
1351 * Check if we need to delay processing because of ALUA
1352 * Active/NonOptimized primary access state..
1353 */
1354 core_alua_check_nonop_delay(se_cmd);
1355
a6360785 1356 transport_handle_cdb_direct(se_cmd);
d6dfc868 1357 return 0;
a6360785 1358}
a026757f
NB		 1359EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1360
1361/*
1362 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1363 *
1364 * @se_cmd: command descriptor to submit
1365 * @se_sess: associated se_sess for endpoint
1366 * @cdb: pointer to SCSI CDB
1367 * @sense: pointer to SCSI sense buffer
1368 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1369 * @data_length: fabric expected data transfer length
1370 * @task_addr: SAM task attribute
1371 * @data_dir: DMA data direction
1372 * @flags: flags for command submission from target_sc_flags_tables
1373 *
1374 * Returns non zero to signal active I/O shutdown failure. All other
1375 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1376 * but still return zero here.
1377 *
1378 * This may only be called from process context, and also currently
1379 * assumes internal allocation of fabric payload buffer by target-core.
1380 *
1381 * It also assumes interal target core SGL memory allocation.
1382 */
1383int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1384 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1385 u32 data_length, int task_attr, int data_dir, int flags)
1386{
1387 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1388 unpacked_lun, data_length, task_attr, data_dir,
1389 flags, NULL, 0, NULL, 0);
1390}
a6360785
NB		 1391EXPORT_SYMBOL(target_submit_cmd);
1392
9f0d05c2
NB		 1393static void target_complete_tmr_failure(struct work_struct *work)
1394{
1395 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1396
1397 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1398 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
9f0d05c2
NB		 1399}
1400
ea98d7f9
AG		 1401/**
1402 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1403 * for TMR CDBs
1404 *
1405 * @se_cmd: command descriptor to submit
1406 * @se_sess: associated se_sess for endpoint
1407 * @sense: pointer to SCSI sense buffer
1408 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1409 * @fabric_context: fabric context for TMR req
1410 * @tm_type: Type of TM request
c0974f89
NB		 1411 * @gfp: gfp type for caller
1412 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1413 * @flags: submit cmd flags
ea98d7f9
AG		 1414 *
1415 * Callable from all contexts.
1416 **/
1417
c7042cae 1418int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1419 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1420 void *fabric_tmr_ptr, unsigned char tm_type,
1421 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1422{
1423 struct se_portal_group *se_tpg;
1424 int ret;
1425
1426 se_tpg = se_sess->se_tpg;
1427 BUG_ON(!se_tpg);
1428
1429 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1430 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1431 /*
1432 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1433 * allocation failure.
1434 */
c0974f89 1435 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1436 if (ret < 0)
1437 return -ENOMEM;
ea98d7f9 1438
c0974f89
NB		 1439 if (tm_type == TMR_ABORT_TASK)
1440 se_cmd->se_tmr_req->ref_task_tag = tag;
1441
ea98d7f9 1442 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1443 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1444 if (ret) {
1445 core_tmr_release_req(se_cmd->se_tmr_req);
1446 return ret;
1447 }
ea98d7f9 1448
ea98d7f9
AG		 1449 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1450 if (ret) {
9f0d05c2
NB		 1451 /*
1452 * For callback during failure handling, push this work off
1453 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1454 */
1455 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1456 schedule_work(&se_cmd->work);
c7042cae 1457 return 0;
ea98d7f9
AG		 1458 }
1459 transport_generic_handle_tmr(se_cmd);
c7042cae 1460 return 0;
ea98d7f9
AG		 1461}
1462EXPORT_SYMBOL(target_submit_tmr);
1463
cdbb70bb 1464/*
cf572a96 1465 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1466 * has completed.
1467 */
cf572a96 1468bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1469{
cdbb70bb
CH		 1470 bool was_active = false;
1471
cf572a96
CH		 1472 if (cmd->transport_state & CMD_T_BUSY) {
1473 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1474 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1475
cf572a96
CH		 1476 pr_debug("cmd %p waiting to complete\n", cmd);
1477 wait_for_completion(&cmd->task_stop_comp);
1478 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1479
1480 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1481 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1482 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1483 was_active = true;
1484 }
1485
cdbb70bb
CH		 1486 return was_active;
1487}
1488
c66ac9db
NB		 1489/*
1490 * Handle SAM-esque emulation for generic transport request failures.
1491 */
de103c93
CH		 1492void transport_generic_request_failure(struct se_cmd *cmd,
1493 sense_reason_t sense_reason)
c66ac9db 1494{
07bde79a
NB		 1495 int ret = 0;
1496
6708bb27 1497 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1498 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1499 cmd->t_task_cdb[0]);
de103c93 1500 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1501 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1502 cmd->t_state, sense_reason);
d43d6aea 1503 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1504 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1505 (cmd->transport_state & CMD_T_STOP) != 0,
1506 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1507
c66ac9db
NB		 1508 /*
1509 * For SAM Task Attribute emulation for failed struct se_cmd
1510 */
019c4ca6 1511 transport_complete_task_attr(cmd);
c66ac9db 1512
de103c93 1513 switch (sense_reason) {
03e98c9e
NB		 1514 case TCM_NON_EXISTENT_LUN:
1515 case TCM_UNSUPPORTED_SCSI_OPCODE:
1516 case TCM_INVALID_CDB_FIELD:
1517 case TCM_INVALID_PARAMETER_LIST:
1518 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1519 case TCM_UNKNOWN_MODE_PAGE:
1520 case TCM_WRITE_PROTECTED:
e2397c70 1521 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1522 case TCM_CHECK_CONDITION_ABORT_CMD:
1523 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1524 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1525 break;
de103c93
CH		 1526 case TCM_OUT_OF_RESOURCES:
1527 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1528 break;
03e98c9e 1529 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1530 /*
1531 * No SENSE Data payload for this case, set SCSI Status
1532 * and queue the response to $FABRIC_MOD.
1533 *
1534 * Uses linux/include/scsi/scsi.h SAM status codes defs
1535 */
1536 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1537 /*
1538 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1539 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1540 * CONFLICT STATUS.
1541 *
1542 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1543 */
e3d6f909 1544 if (cmd->se_sess &&
0fd97ccf 1545 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1546 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1547 cmd->orig_fe_lun, 0x2C,
1548 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1549
07bde79a 1550 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1551 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1552 goto queue_full;
c66ac9db 1553 goto check_stop;
c66ac9db 1554 default:
6708bb27 1555 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1556 cmd->t_task_cdb[0], sense_reason);
1557 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1558 break;
1559 }
f3146437 1560
de103c93 1561 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1562 if (ret == -EAGAIN || ret == -ENOMEM)
1563 goto queue_full;
07bde79a 1564
c66ac9db
NB		 1565check_stop:
1566 transport_lun_remove_cmd(cmd);
6708bb27 1567 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1568 ;
07bde79a
NB		 1569 return;
1570
1571queue_full:
e057f533
CH		 1572 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1573 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1574}
2fbff127 1575EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1576
5f41a31d 1577static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1578{
de103c93 1579 sense_reason_t ret;
5f41a31d
CH		 1580
1581 spin_lock_irq(&cmd->t_state_lock);
1582 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1583 spin_unlock_irq(&cmd->t_state_lock);
1584
de103c93
CH		 1585 if (cmd->execute_cmd) {
1586 ret = cmd->execute_cmd(cmd);
1587 if (ret) {
1588 spin_lock_irq(&cmd->t_state_lock);
1589 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1590 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1591
de103c93
CH		 1592 transport_generic_request_failure(cmd, ret);
1593 }
5f41a31d
CH		 1594 }
1595}
1596
019c4ca6 1597static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1598{
1599 struct se_device *dev = cmd->se_dev;
1600
019c4ca6
CH		 1601 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1602 return false;
5f41a31d 1603
c66ac9db 1604 /*
25985edc 1605 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1606 * to allow the passed struct se_cmd list of tasks to the front of the list.
1607 */
5f41a31d
CH		 1608 switch (cmd->sam_task_attr) {
1609 case MSG_HEAD_TAG:
1610 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1611 "se_ordered_id: %u\n",
1612 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1613 return false;
5f41a31d
CH		 1614 case MSG_ORDERED_TAG:
1615 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1616 smp_mb__after_atomic_inc();
1617
5f41a31d
CH		 1618 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1619 " se_ordered_id: %u\n",
1620 cmd->t_task_cdb[0], cmd->se_ordered_id);
1621
c66ac9db 1622 /*
5f41a31d
CH		 1623 * Execute an ORDERED command if no other older commands
1624 * exist that need to be completed first.
c66ac9db 1625 */
5f41a31d 1626 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1627 return false;
5f41a31d
CH		 1628 break;
1629 default:
c66ac9db
NB		 1630 /*
1631 * For SIMPLE and UNTAGGED Task Attribute commands
1632 */
5f41a31d 1633 atomic_inc(&dev->simple_cmds);
c66ac9db 1634 smp_mb__after_atomic_inc();
5f41a31d 1635 break;
c66ac9db 1636 }
5f41a31d 1637
019c4ca6
CH		 1638 if (atomic_read(&dev->dev_ordered_sync) == 0)
1639 return false;
c66ac9db 1640
019c4ca6
CH		 1641 spin_lock(&dev->delayed_cmd_lock);
1642 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1643 spin_unlock(&dev->delayed_cmd_lock);
1644
1645 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1646 " delayed CMD list, se_ordered_id: %u\n",
1647 cmd->t_task_cdb[0], cmd->sam_task_attr,
1648 cmd->se_ordered_id);
1649 return true;
1650}
1651
1652void target_execute_cmd(struct se_cmd *cmd)
1653{
1654 /*
1655 * If the received CDB has aleady been aborted stop processing it here.
1656 */
5bd665f2
LT		 1657 if (transport_check_aborted_status(cmd, 1)) {
1658 complete(&cmd->transport_lun_stop_comp);
5f41a31d 1659 return;
c66ac9db 1660 }
c66ac9db 1661
c66ac9db 1662 /*
019c4ca6
CH		 1663 * Determine if IOCTL context caller in requesting the stopping of this
1664 * command for LUN shutdown purposes.
c66ac9db 1665 */
019c4ca6
CH		 1666 spin_lock_irq(&cmd->t_state_lock);
1667 if (cmd->transport_state & CMD_T_LUN_STOP) {
1668 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1669 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1670
1671 cmd->transport_state &= ~CMD_T_ACTIVE;
1672 spin_unlock_irq(&cmd->t_state_lock);
1673 complete(&cmd->transport_lun_stop_comp);
1674 return;
1675 }
1676 /*
1677 * Determine if frontend context caller is requesting the stopping of
1678 * this command for frontend exceptions.
1679 */
1680 if (cmd->transport_state & CMD_T_STOP) {
1681 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1682 __func__, __LINE__,
1683 cmd->se_tfo->get_task_tag(cmd));
1684
1685 spin_unlock_irq(&cmd->t_state_lock);
1686 complete(&cmd->t_transport_stop_comp);
1687 return;
1688 }
1689
1690 cmd->t_state = TRANSPORT_PROCESSING;
e627c615 1691 cmd->transport_state |= CMD_T_ACTIVE;
019c4ca6
CH		 1692 spin_unlock_irq(&cmd->t_state_lock);
1693
1694 if (!target_handle_task_attr(cmd))
1695 __target_execute_cmd(cmd);
c66ac9db 1696}
70baf0ab 1697EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1698
5f41a31d
CH		 1699/*
1700 * Process all commands up to the last received ORDERED task attribute which
1701 * requires another blocking boundary
1702 */
1703static void target_restart_delayed_cmds(struct se_device *dev)
1704{
1705 for (;;) {
1706 struct se_cmd *cmd;
1707
1708 spin_lock(&dev->delayed_cmd_lock);
1709 if (list_empty(&dev->delayed_cmd_list)) {
1710 spin_unlock(&dev->delayed_cmd_lock);
1711 break;
1712 }
1713
1714 cmd = list_entry(dev->delayed_cmd_list.next,
1715 struct se_cmd, se_delayed_node);
1716 list_del(&cmd->se_delayed_node);
1717 spin_unlock(&dev->delayed_cmd_lock);
1718
1719 __target_execute_cmd(cmd);
1720
1721 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1722 break;
1723 }
1724}
1725
c66ac9db 1726/*
35e0e757 1727 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1728 * and ordered cmds need to have their tasks added to the execution queue.
1729 */
1730static void transport_complete_task_attr(struct se_cmd *cmd)
1731{
5951146d 1732 struct se_device *dev = cmd->se_dev;
c66ac9db 1733
019c4ca6
CH		 1734 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1735 return;
1736
e66ecd50 1737 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1738 atomic_dec(&dev->simple_cmds);
1739 smp_mb__after_atomic_dec();
1740 dev->dev_cur_ordered_id++;
6708bb27 1741 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1742 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1743 cmd->se_ordered_id);
e66ecd50 1744 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1745 dev->dev_cur_ordered_id++;
6708bb27 1746 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1747 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1748 cmd->se_ordered_id);
e66ecd50 1749 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1750 atomic_dec(&dev->dev_ordered_sync);
1751 smp_mb__after_atomic_dec();
c66ac9db
NB		 1752
1753 dev->dev_cur_ordered_id++;
6708bb27 1754 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1755 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1756 }
c66ac9db 1757
5f41a31d 1758 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1759}
1760
e057f533 1761static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1762{
1763 int ret = 0;
1764
019c4ca6 1765 transport_complete_task_attr(cmd);
e057f533
CH		 1766
1767 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1768 ret = cmd->se_tfo->queue_status(cmd);
1769 if (ret)
1770 goto out;
1771 }
07bde79a
NB		 1772
1773 switch (cmd->data_direction) {
1774 case DMA_FROM_DEVICE:
1775 ret = cmd->se_tfo->queue_data_in(cmd);
1776 break;
1777 case DMA_TO_DEVICE:
ec98f782 1778 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 1779 ret = cmd->se_tfo->queue_data_in(cmd);
1780 if (ret < 0)
e057f533 1781 break;
07bde79a
NB		 1782 }
1783 /* Fall through for DMA_TO_DEVICE */
1784 case DMA_NONE:
1785 ret = cmd->se_tfo->queue_status(cmd);
1786 break;
1787 default:
1788 break;
1789 }
1790
e057f533
CH		 1791out:
1792 if (ret < 0) {
1793 transport_handle_queue_full(cmd, cmd->se_dev);
1794 return;
1795 }
1796 transport_lun_remove_cmd(cmd);
1797 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1798}
1799
1800static void transport_handle_queue_full(
1801 struct se_cmd *cmd,
e057f533 1802 struct se_device *dev)
07bde79a
NB		 1803{
1804 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1805 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1806 atomic_inc(&dev->dev_qf_count);
1807 smp_mb__after_atomic_inc();
1808 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1809
1810 schedule_work(&cmd->se_dev->qf_work_queue);
1811}
1812
35e0e757 1813static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1814{
35e0e757 1815 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1816 int ret;
35e0e757 1817
c66ac9db
NB		 1818 /*
1819 * Check if we need to move delayed/dormant tasks from cmds on the
1820 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1821 * Attribute.
1822 */
019c4ca6
CH		 1823 transport_complete_task_attr(cmd);
1824
07bde79a
NB		 1825 /*
1826 * Check to schedule QUEUE_FULL work, or execute an existing
1827 * cmd->transport_qf_callback()
1828 */
1829 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1830 schedule_work(&cmd->se_dev->qf_work_queue);
1831
c66ac9db 1832 /*
d5829eac 1833 * Check if we need to send a sense buffer from
c66ac9db
NB		 1834 * the struct se_cmd in question.
1835 */
1836 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1837 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1838 ret = transport_send_check_condition_and_sense(
1839 cmd, 0, 1);
1840 if (ret == -EAGAIN || ret == -ENOMEM)
1841 goto queue_full;
1842
1843 transport_lun_remove_cmd(cmd);
1844 transport_cmd_check_stop_to_fabric(cmd);
1845 return;
c66ac9db
NB		 1846 }
1847 /*
25985edc 1848 * Check for a callback, used by amongst other things
c66ac9db
NB		 1849 * XDWRITE_READ_10 emulation.
1850 */
1851 if (cmd->transport_complete_callback)
1852 cmd->transport_complete_callback(cmd);
1853
1854 switch (cmd->data_direction) {
1855 case DMA_FROM_DEVICE:
1856 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1857 if (cmd->se_lun->lun_sep) {
1858 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1859 cmd->data_length;
1860 }
1861 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1862
07bde79a 1863 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1864 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1865 goto queue_full;
c66ac9db
NB		 1866 break;
1867 case DMA_TO_DEVICE:
1868 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1869 if (cmd->se_lun->lun_sep) {
1870 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1871 cmd->data_length;
1872 }
1873 spin_unlock(&cmd->se_lun->lun_sep_lock);
1874 /*
1875 * Check if we need to send READ payload for BIDI-COMMAND
1876 */
ec98f782 1877 if (cmd->t_bidi_data_sg) {
c66ac9db 1878 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1879 if (cmd->se_lun->lun_sep) {
1880 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1881 cmd->data_length;
1882 }
1883 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1884 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1885 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1886 goto queue_full;
c66ac9db
NB		 1887 break;
1888 }
1889 /* Fall through for DMA_TO_DEVICE */
1890 case DMA_NONE:
07bde79a 1891 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1892 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1893 goto queue_full;
c66ac9db
NB		 1894 break;
1895 default:
1896 break;
1897 }
1898
1899 transport_lun_remove_cmd(cmd);
1900 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1901 return;
1902
1903queue_full:
6708bb27 1904 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1905 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1906 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1907 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1908}
1909
6708bb27 1910static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 1911{
ec98f782 1912 struct scatterlist *sg;
ec98f782 1913 int count;
c66ac9db 1914
6708bb27
AG		 1915 for_each_sg(sgl, sg, nents, count)
1916 __free_page(sg_page(sg));
c66ac9db 1917
6708bb27
AG		 1918 kfree(sgl);
1919}
c66ac9db 1920
6708bb27
AG		 1921static inline void transport_free_pages(struct se_cmd *cmd)
1922{
1923 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
1924 return;
1925
1926 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 1927 cmd->t_data_sg = NULL;
1928 cmd->t_data_nents = 0;
c66ac9db 1929
6708bb27 1930 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 1931 cmd->t_bidi_data_sg = NULL;
1932 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 1933}
1934
e26d99ae
CH		 1935/**
1936 * transport_release_cmd - free a command
1937 * @cmd: command to free
1938 *
1939 * This routine unconditionally frees a command, and reference counting
1940 * or list removal must be done in the caller.
1941 */
1942static void transport_release_cmd(struct se_cmd *cmd)
1943{
1944 BUG_ON(!cmd->se_tfo);
1945
c8e31f26 1946 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 1947 core_tmr_release_req(cmd->se_tmr_req);
1948 if (cmd->t_task_cdb != cmd->__t_task_cdb)
1949 kfree(cmd->t_task_cdb);
1950 /*
7481deb4
NB		 1951 * If this cmd has been setup with target_get_sess_cmd(), drop
1952 * the kref and call ->release_cmd() in kref callback.
e26d99ae 1953 */
7481deb4
NB		 1954 if (cmd->check_release != 0) {
1955 target_put_sess_cmd(cmd->se_sess, cmd);
1956 return;
1957 }
e26d99ae
CH		 1958 cmd->se_tfo->release_cmd(cmd);
1959}
1960
d3df7825
CH		 1961/**
1962 * transport_put_cmd - release a reference to a command
1963 * @cmd: command to release
1964 *
1965 * This routine releases our reference to the command and frees it if possible.
1966 */
39c05f32 1967static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 1968{
1969 unsigned long flags;
c66ac9db 1970
a1d8b49a 1971 spin_lock_irqsave(&cmd->t_state_lock, flags);
d9ed6947
RD		 1972 if (atomic_read(&cmd->t_fe_count) &&
1973 !atomic_dec_and_test(&cmd->t_fe_count)) {
1974 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1975 return;
4911e3cc
CH		 1976 }
1977
7d680f3b
CH		 1978 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
1979 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 1980 target_remove_from_state_list(cmd);
c66ac9db 1981 }
a1d8b49a 1982 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 1983
c66ac9db 1984 transport_free_pages(cmd);
31afc39c 1985 transport_release_cmd(cmd);
39c05f32 1986 return;
c66ac9db 1987}
c66ac9db 1988
4949314c 1989void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 1990{
ec98f782 1991 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 1992 struct page **pages;
1993 int i;
05d1c7c0
AG		 1994
1995 /*
ec98f782
AG		 1996 * We need to take into account a possible offset here for fabrics like
1997 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
1998 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 1999 */
4949314c
AG		 2000 if (!cmd->t_data_nents)
2001 return NULL;
3717ef0c
PB		 2002
2003 BUG_ON(!sg);
2004 if (cmd->t_data_nents == 1)
4949314c
AG		 2005 return kmap(sg_page(sg)) + sg->offset;
2006
2007 /* >1 page. use vmap */
2008 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2009 if (!pages)
4949314c
AG		 2010 return NULL;
2011
2012 /* convert sg[] to pages[] */
2013 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2014 pages[i] = sg_page(sg);
2015 }
2016
2017 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2018 kfree(pages);
de103c93 2019 if (!cmd->t_data_vmap)
4949314c
AG		 2020 return NULL;
2021
2022 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2023}
4949314c 2024EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2025
4949314c 2026void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2027{
a1edf9cf 2028 if (!cmd->t_data_nents) {
4949314c 2029 return;
a1edf9cf 2030 } else if (cmd->t_data_nents == 1) {
4949314c 2031 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2032 return;
2033 }
4949314c
AG		 2034
2035 vunmap(cmd->t_data_vmap);
2036 cmd->t_data_vmap = NULL;
05d1c7c0 2037}
4949314c 2038EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2039
c66ac9db 2040static int
05d1c7c0 2041transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2042{
ec98f782
AG		 2043 u32 length = cmd->data_length;
2044 unsigned int nents;
2045 struct page *page;
9db9da33 2046 gfp_t zero_flag;
ec98f782 2047 int i = 0;
c66ac9db 2048
ec98f782
AG		 2049 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2050 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2051 if (!cmd->t_data_sg)
2052 return -ENOMEM;
c66ac9db 2053
ec98f782
AG		 2054 cmd->t_data_nents = nents;
2055 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2056
64f1db38 2057 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2058
ec98f782
AG		 2059 while (length) {
2060 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2061 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2062 if (!page)
2063 goto out;
c66ac9db 2064
ec98f782
AG		 2065 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2066 length -= page_len;
2067 i++;
c66ac9db 2068 }
c66ac9db 2069 return 0;
c66ac9db 2070
ec98f782 2071out:
d0e27c88 2072 while (i > 0) {
ec98f782 2073 i--;
d0e27c88 2074 __free_page(sg_page(&cmd->t_data_sg[i]));
c66ac9db 2075 }
ec98f782
AG		 2076 kfree(cmd->t_data_sg);
2077 cmd->t_data_sg = NULL;
2078 return -ENOMEM;
c66ac9db
NB		 2079}
2080
da0f7619 2081/*
b16a35b0
AG		 2082 * Allocate any required resources to execute the command. For writes we
2083 * might not have the payload yet, so notify the fabric via a call to
2084 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2085 */
de103c93
CH		 2086sense_reason_t
2087transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2088{
c66ac9db
NB		 2089 int ret = 0;
2090
2091 /*
2092 * Determine is the TCM fabric module has already allocated physical
2093 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2094 * beforehand.
c66ac9db 2095 */
ec98f782
AG		 2096 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2097 cmd->data_length) {
05d1c7c0 2098 ret = transport_generic_get_mem(cmd);
c66ac9db 2099 if (ret < 0)
de103c93 2100 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2101 }
da0f7619 2102
4101f0a8 2103 atomic_inc(&cmd->t_fe_count);
4101f0a8 2104
c66ac9db 2105 /*
c3196f0c
CH		 2106 * If this command is not a write we can execute it right here,
2107 * for write buffers we need to notify the fabric driver first
2108 * and let it call back once the write buffers are ready.
c66ac9db 2109 */
5f41a31d 2110 target_add_to_state_list(cmd);
c3196f0c
CH		 2111 if (cmd->data_direction != DMA_TO_DEVICE) {
2112 target_execute_cmd(cmd);
2113 return 0;
2114 }
2115
2116 spin_lock_irq(&cmd->t_state_lock);
2117 cmd->t_state = TRANSPORT_WRITE_PENDING;
2118 spin_unlock_irq(&cmd->t_state_lock);
2119
2120 transport_cmd_check_stop(cmd, false);
2121
2122 ret = cmd->se_tfo->write_pending(cmd);
2123 if (ret == -EAGAIN || ret == -ENOMEM)
2124 goto queue_full;
2125
de103c93
CH		 2126 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2127 WARN_ON(ret);
2128
b69c1fcf 2129 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2130
c3196f0c
CH		 2131queue_full:
2132 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2133 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2134 transport_handle_queue_full(cmd, cmd->se_dev);
2135 return 0;
c66ac9db 2136}
a1d8b49a 2137EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2138
e057f533 2139static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2140{
f147abb4
NB		 2141 int ret;
2142
2143 ret = cmd->se_tfo->write_pending(cmd);
2144 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2145 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2146 cmd);
2147 transport_handle_queue_full(cmd, cmd->se_dev);
2148 }
07bde79a
NB		 2149}
2150
39c05f32 2151void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2152{
d14921d6 2153 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2154 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2155 transport_wait_for_tasks(cmd);
2156
35462975 2157 transport_release_cmd(cmd);
d14921d6
NB		 2158 } else {
2159 if (wait_for_tasks)
2160 transport_wait_for_tasks(cmd);
2161
c66ac9db
NB		 2162 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2163
82f1c8a4 2164 if (cmd->se_lun)
c66ac9db 2165 transport_lun_remove_cmd(cmd);
c66ac9db 2166
39c05f32 2167 transport_put_cmd(cmd);
c66ac9db
NB		 2168 }
2169}
2170EXPORT_SYMBOL(transport_generic_free_cmd);
2171
a17f091d
NB		 2172/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2173 * @se_sess: session to reference
2174 * @se_cmd: command descriptor to add
a6360785 2175 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2176 */
bc187ea6
RD		 2177static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2178 bool ack_kref)
a17f091d
NB		 2179{
2180 unsigned long flags;
bc187ea6 2181 int ret = 0;
a17f091d 2182
7481deb4 2183 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2184 /*
2185 * Add a second kref if the fabric caller is expecting to handle
2186 * fabric acknowledgement that requires two target_put_sess_cmd()
2187 * invocations before se_cmd descriptor release.
2188 */
86715569 2189 if (ack_kref == true) {
a6360785 2190 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2191 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2192 }
7481deb4 2193
a17f091d 2194 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2195 if (se_sess->sess_tearing_down) {
2196 ret = -ESHUTDOWN;
2197 goto out;
2198 }
a17f091d
NB		 2199 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2200 se_cmd->check_release = 1;
bc187ea6
RD		 2201
2202out:
a17f091d 2203 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2204 return ret;
a17f091d 2205}
a17f091d 2206
7481deb4 2207static void target_release_cmd_kref(struct kref *kref)
a17f091d 2208{
7481deb4
NB		 2209 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2210 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 2211 unsigned long flags;
2212
2213 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2214 if (list_empty(&se_cmd->se_cmd_list)) {
2215 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2216 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2217 return;
a17f091d 2218 }
a17f091d
NB		 2219 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2220 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2221 complete(&se_cmd->cmd_wait_comp);
7481deb4 2222 return;
a17f091d
NB		 2223 }
2224 list_del(&se_cmd->se_cmd_list);
2225 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2226
7481deb4
NB		 2227 se_cmd->se_tfo->release_cmd(se_cmd);
2228}
2229
2230/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2231 * @se_sess: session to reference
2232 * @se_cmd: command descriptor to drop
2233 */
2234int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2235{
2236 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2237}
2238EXPORT_SYMBOL(target_put_sess_cmd);
2239
1c7b13fe
RD		 2240/* target_sess_cmd_list_set_waiting - Flag all commands in
2241 * sess_cmd_list to complete cmd_wait_comp. Set
2242 * sess_tearing_down so no more commands are queued.
2243 * @se_sess: session to flag
a17f091d 2244 */
1c7b13fe 2245void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2246{
2247 struct se_cmd *se_cmd;
2248 unsigned long flags;
2249
a17f091d 2250 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
a17f091d 2251
1c7b13fe
RD		 2252 WARN_ON(se_sess->sess_tearing_down);
2253 se_sess->sess_tearing_down = 1;
a17f091d 2254
1c7b13fe 2255 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
a17f091d
NB		 2256 se_cmd->cmd_wait_set = 1;
2257
2258 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2259}
1c7b13fe 2260EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2261
2262/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2263 * @se_sess: session to wait for active I/O
2264 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2265 */
2266void target_wait_for_sess_cmds(
2267 struct se_session *se_sess,
2268 int wait_for_tasks)
2269{
2270 struct se_cmd *se_cmd, *tmp_cmd;
2271 bool rc = false;
2272
2273 list_for_each_entry_safe(se_cmd, tmp_cmd,
1c7b13fe 2274 &se_sess->sess_cmd_list, se_cmd_list) {
a17f091d
NB		 2275 list_del(&se_cmd->se_cmd_list);
2276
2277 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2278 " %d\n", se_cmd, se_cmd->t_state,
2279 se_cmd->se_tfo->get_cmd_state(se_cmd));
2280
2281 if (wait_for_tasks) {
2282 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2283 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2284 se_cmd->se_tfo->get_cmd_state(se_cmd));
2285
2286 rc = transport_wait_for_tasks(se_cmd);
2287
2288 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2289 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2290 se_cmd->se_tfo->get_cmd_state(se_cmd));
2291 }
2292
2293 if (!rc) {
2294 wait_for_completion(&se_cmd->cmd_wait_comp);
2295 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2296 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2297 se_cmd->se_tfo->get_cmd_state(se_cmd));
2298 }
2299
2300 se_cmd->se_tfo->release_cmd(se_cmd);
2301 }
2302}
2303EXPORT_SYMBOL(target_wait_for_sess_cmds);
2304
c66ac9db
NB		 2305/* transport_lun_wait_for_tasks():
2306 *
2307 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2308 * an struct se_lun to be successfully shutdown.
2309 */
2310static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2311{
2312 unsigned long flags;
cf572a96
CH		 2313 int ret = 0;
2314
c66ac9db
NB		 2315 /*
2316 * If the frontend has already requested this struct se_cmd to
2317 * be stopped, we can safely ignore this struct se_cmd.
2318 */
a1d8b49a 2319 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2320 if (cmd->transport_state & CMD_T_STOP) {
2321 cmd->transport_state &= ~CMD_T_LUN_STOP;
2322
2323 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2324 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2325 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2326 transport_cmd_check_stop(cmd, false);
e3d6f909 2327 return -EPERM;
c66ac9db 2328 }
7d680f3b 2329 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2330 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2331
cf572a96
CH		 2332 // XXX: audit task_flags checks.
2333 spin_lock_irqsave(&cmd->t_state_lock, flags);
2334 if ((cmd->transport_state & CMD_T_BUSY) &&
2335 (cmd->transport_state & CMD_T_SENT)) {
2336 if (!target_stop_cmd(cmd, &flags))
2337 ret++;
cf572a96 2338 }
5f41a31d 2339 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2340
785fdf70
CH		 2341 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2342 " %d\n", cmd, ret);
c66ac9db 2343 if (!ret) {
6708bb27 2344 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2345 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2346 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2347 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2348 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2349 }
c66ac9db
NB		 2350
2351 return 0;
2352}
2353
c66ac9db
NB		 2354static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2355{
2356 struct se_cmd *cmd = NULL;
2357 unsigned long lun_flags, cmd_flags;
2358 /*
2359 * Do exception processing and return CHECK_CONDITION status to the
2360 * Initiator Port.
2361 */
2362 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2363 while (!list_empty(&lun->lun_cmd_list)) {
2364 cmd = list_first_entry(&lun->lun_cmd_list,
2365 struct se_cmd, se_lun_node);
3d26fea0 2366 list_del_init(&cmd->se_lun_node);
5951146d 2367
a1d8b49a 2368 spin_lock(&cmd->t_state_lock);
6708bb27 2369 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2370 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2371 cmd->se_lun->unpacked_lun,
2372 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2373 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2374 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2375
2376 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2377
6708bb27
AG		 2378 if (!cmd->se_lun) {
2379 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2380 cmd->se_tfo->get_task_tag(cmd),
2381 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2382 BUG();
2383 }
2384 /*
2385 * If the Storage engine still owns the iscsi_cmd_t, determine
2386 * and/or stop its context.
2387 */
6708bb27 2388 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2389 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2390 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2391
e3d6f909 2392 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2393 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2394 continue;
2395 }
2396
6708bb27 2397 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2398 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2399 cmd->se_lun->unpacked_lun,
2400 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2401
a1d8b49a 2402 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2403 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2404 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2405 goto check_cond;
2406 }
7d680f3b 2407 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2408 target_remove_from_state_list(cmd);
a1d8b49a 2409 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2410
c66ac9db
NB		 2411 /*
2412 * The Storage engine stopped this struct se_cmd before it was
2413 * send to the fabric frontend for delivery back to the
2414 * Initiator Node. Return this SCSI CDB back with an
2415 * CHECK_CONDITION status.
2416 */
2417check_cond:
2418 transport_send_check_condition_and_sense(cmd,
2419 TCM_NON_EXISTENT_LUN, 0);
2420 /*
2421 * If the fabric frontend is waiting for this iscsi_cmd_t to
2422 * be released, notify the waiting thread now that LU has
2423 * finished accessing it.
2424 */
a1d8b49a 2425 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2426 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2427 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2428 " struct se_cmd: %p ITT: 0x%08x\n",
2429 lun->unpacked_lun,
e3d6f909 2430 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2431
a1d8b49a 2432 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2433 cmd_flags);
f7113a47 2434 transport_cmd_check_stop(cmd, false);
a1d8b49a 2435 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2436 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2437 continue;
2438 }
6708bb27 2439 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2440 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2441
a1d8b49a 2442 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2443 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2444 }
2445 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2446}
2447
2448static int transport_clear_lun_thread(void *p)
2449{
8359cf43 2450 struct se_lun *lun = p;
c66ac9db
NB		 2451
2452 __transport_clear_lun_from_sessions(lun);
2453 complete(&lun->lun_shutdown_comp);
2454
2455 return 0;
2456}
2457
2458int transport_clear_lun_from_sessions(struct se_lun *lun)
2459{
2460 struct task_struct *kt;
2461
5951146d 2462 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2463 "tcm_cl_%u", lun->unpacked_lun);
2464 if (IS_ERR(kt)) {
6708bb27 2465 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2466 return PTR_ERR(kt);
c66ac9db
NB		 2467 }
2468 wait_for_completion(&lun->lun_shutdown_comp);
2469
2470 return 0;
2471}
2472
d14921d6
NB		 2473/**
2474 * transport_wait_for_tasks - wait for completion to occur
2475 * @cmd: command to wait
c66ac9db 2476 *
d14921d6
NB		 2477 * Called from frontend fabric context to wait for storage engine
2478 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2479 */
a17f091d 2480bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2481{
2482 unsigned long flags;
2483
a1d8b49a 2484 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2485 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2486 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2487 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2488 return false;
d14921d6 2489 }
cb4f4d3c 2490
c8e31f26
AG		 2491 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2492 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2493 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2494 return false;
d14921d6 2495 }
c66ac9db
NB		 2496 /*
2497 * If we are already stopped due to an external event (ie: LUN shutdown)
2498 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2499 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2500 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2501 * has completed its operation on the struct se_cmd.
2502 */
7d680f3b 2503 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2504 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2505 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2506 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2507 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2508 /*
2509 * There is a special case for WRITES where a FE exception +
2510 * LUN shutdown means ConfigFS context is still sleeping on
2511 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2512 * We go ahead and up transport_lun_stop_comp just to be sure
2513 * here.
2514 */
a1d8b49a
AG		 2515 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2516 complete(&cmd->transport_lun_stop_comp);
2517 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2518 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2519
cf572a96 2520 target_remove_from_state_list(cmd);
c66ac9db
NB		 2521 /*
2522 * At this point, the frontend who was the originator of this
2523 * struct se_cmd, now owns the structure and can be released through
2524 * normal means below.
2525 */
6708bb27 2526 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2527 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2528 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2529 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2530
7d680f3b 2531 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2532 }
7d680f3b 2533
3d28934a 2534 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2535 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2536 return false;
d14921d6 2537 }
c66ac9db 2538
7d680f3b 2539 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2540
6708bb27 2541 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2542 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2543 cmd, cmd->se_tfo->get_task_tag(cmd),
2544 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2545
a1d8b49a 2546 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2547
a1d8b49a 2548 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2549
a1d8b49a 2550 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2551 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2552
35d1efe8 2553 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2554 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2555 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2556
d14921d6 2557 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2558
2559 return true;
c66ac9db 2560}
d14921d6 2561EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2562
2563static int transport_get_sense_codes(
2564 struct se_cmd *cmd,
2565 u8 *asc,
2566 u8 *ascq)
2567{
2568 *asc = cmd->scsi_asc;
2569 *ascq = cmd->scsi_ascq;
2570
2571 return 0;
2572}
2573
de103c93
CH		 2574int
2575transport_send_check_condition_and_sense(struct se_cmd *cmd,
2576 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2577{
2578 unsigned char *buffer = cmd->sense_buffer;
2579 unsigned long flags;
c66ac9db
NB		 2580 u8 asc = 0, ascq = 0;
2581
a1d8b49a 2582 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2583 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2584 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2585 return 0;
2586 }
2587 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2588 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2589
2590 if (!reason && from_transport)
2591 goto after_reason;
2592
2593 if (!from_transport)
2594 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2595
c66ac9db
NB		 2596 /*
2597 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2598 * SENSE KEY values from include/scsi/scsi.h
2599 */
2600 switch (reason) {
ba829137
HR		 2601 case TCM_NO_SENSE:
2602 /* CURRENT ERROR */
2603 buffer[0] = 0x70;
2604 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2605 /* Not Ready */
2606 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2607 /* NO ADDITIONAL SENSE INFORMATION */
2608 buffer[SPC_ASC_KEY_OFFSET] = 0;
2609 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2610 break;
c66ac9db 2611 case TCM_NON_EXISTENT_LUN:
eb39d340 2612 /* CURRENT ERROR */
9c58b7dd
RD		 2613 buffer[0] = 0x70;
2614 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2615 /* ILLEGAL REQUEST */
9c58b7dd 2616 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2617 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2618 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2619 break;
c66ac9db
NB		 2620 case TCM_UNSUPPORTED_SCSI_OPCODE:
2621 case TCM_SECTOR_COUNT_TOO_MANY:
2622 /* CURRENT ERROR */
9c58b7dd
RD		 2623 buffer[0] = 0x70;
2624 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2625 /* ILLEGAL REQUEST */
9c58b7dd 2626 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2627 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2628 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2629 break;
2630 case TCM_UNKNOWN_MODE_PAGE:
2631 /* CURRENT ERROR */
9c58b7dd
RD		 2632 buffer[0] = 0x70;
2633 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2634 /* ILLEGAL REQUEST */
9c58b7dd 2635 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2636 /* INVALID FIELD IN CDB */
9c58b7dd 2637 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2638 break;
2639 case TCM_CHECK_CONDITION_ABORT_CMD:
2640 /* CURRENT ERROR */
9c58b7dd
RD		 2641 buffer[0] = 0x70;
2642 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2643 /* ABORTED COMMAND */
9c58b7dd 2644 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2645 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2646 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2647 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2648 break;
2649 case TCM_INCORRECT_AMOUNT_OF_DATA:
2650 /* CURRENT ERROR */
9c58b7dd
RD		 2651 buffer[0] = 0x70;
2652 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2653 /* ABORTED COMMAND */
9c58b7dd 2654 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2655 /* WRITE ERROR */
9c58b7dd 2656 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2657 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2658 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2659 break;
2660 case TCM_INVALID_CDB_FIELD:
2661 /* CURRENT ERROR */
9c58b7dd
RD		 2662 buffer[0] = 0x70;
2663 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2664 /* ILLEGAL REQUEST */
9c58b7dd 2665 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2666 /* INVALID FIELD IN CDB */
9c58b7dd 2667 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2668 break;
2669 case TCM_INVALID_PARAMETER_LIST:
2670 /* CURRENT ERROR */
9c58b7dd
RD		 2671 buffer[0] = 0x70;
2672 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2673 /* ILLEGAL REQUEST */
9c58b7dd 2674 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2675 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2676 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db
NB		 2677 break;
2678 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2679 /* CURRENT ERROR */
9c58b7dd
RD		 2680 buffer[0] = 0x70;
2681 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2682 /* ABORTED COMMAND */
9c58b7dd 2683 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2684 /* WRITE ERROR */
9c58b7dd 2685 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2686 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2687 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2688 break;
2689 case TCM_SERVICE_CRC_ERROR:
2690 /* CURRENT ERROR */
9c58b7dd
RD		 2691 buffer[0] = 0x70;
2692 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2693 /* ABORTED COMMAND */
9c58b7dd 2694 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2695 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2696 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2697 /* N/A */
9c58b7dd 2698 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2699 break;
2700 case TCM_SNACK_REJECTED:
2701 /* CURRENT ERROR */
9c58b7dd
RD		 2702 buffer[0] = 0x70;
2703 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2704 /* ABORTED COMMAND */
9c58b7dd 2705 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2706 /* READ ERROR */
9c58b7dd 2707 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2708 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2709 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2710 break;
2711 case TCM_WRITE_PROTECTED:
2712 /* CURRENT ERROR */
9c58b7dd
RD		 2713 buffer[0] = 0x70;
2714 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2715 /* DATA PROTECT */
9c58b7dd 2716 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2717 /* WRITE PROTECTED */
9c58b7dd 2718 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2719 break;
e2397c70
RD		 2720 case TCM_ADDRESS_OUT_OF_RANGE:
2721 /* CURRENT ERROR */
9c58b7dd
RD		 2722 buffer[0] = 0x70;
2723 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2724 /* ILLEGAL REQUEST */
9c58b7dd 2725 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2726 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2727 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2728 break;
c66ac9db
NB		 2729 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2730 /* CURRENT ERROR */
9c58b7dd
RD		 2731 buffer[0] = 0x70;
2732 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2733 /* UNIT ATTENTION */
9c58b7dd 2734 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2735 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2736 buffer[SPC_ASC_KEY_OFFSET] = asc;
2737 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2738 break;
2739 case TCM_CHECK_CONDITION_NOT_READY:
2740 /* CURRENT ERROR */
9c58b7dd
RD		 2741 buffer[0] = 0x70;
2742 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2743 /* Not Ready */
9c58b7dd 2744 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2745 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2746 buffer[SPC_ASC_KEY_OFFSET] = asc;
2747 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2748 break;
2749 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2750 default:
2751 /* CURRENT ERROR */
9c58b7dd
RD		 2752 buffer[0] = 0x70;
2753 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2754 /* ILLEGAL REQUEST */
9c58b7dd 2755 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2756 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2757 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2758 break;
2759 }
2760 /*
2761 * This code uses linux/include/scsi/scsi.h SAM status codes!
2762 */
2763 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2764 /*
2765 * Automatically padded, this value is encoded in the fabric's
2766 * data_length response PDU containing the SCSI defined sense data.
2767 */
9c58b7dd 2768 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2769
2770after_reason:
07bde79a 2771 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2772}
2773EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2774
2775int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2776{
c18bc7d8
RD		 2777 if (!(cmd->transport_state & CMD_T_ABORTED))
2778 return 0;
c66ac9db 2779
c18bc7d8
RD		 2780 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2781 return 1;
8b1e1244 2782
c18bc7d8
RD		 2783 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2784 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2785
c18bc7d8
RD		 2786 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
2787 cmd->se_tfo->queue_status(cmd);
2788
2789 return 1;
c66ac9db
NB		 2790}
2791EXPORT_SYMBOL(transport_check_aborted_status);
2792
2793void transport_send_task_abort(struct se_cmd *cmd)
2794{
c252f003
NB		 2795 unsigned long flags;
2796
2797 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2798 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2799 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2800 return;
2801 }
2802 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2803
c66ac9db
NB		 2804 /*
2805 * If there are still expected incoming fabric WRITEs, we wait
2806 * until until they have completed before sending a TASK_ABORTED
2807 * response. This response with TASK_ABORTED status will be
2808 * queued back to fabric module by transport_check_aborted_status().
2809 */
2810 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2811 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2812 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2813 smp_mb__after_atomic_inc();
c66ac9db
NB		 2814 }
2815 }
2816 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2817
6708bb27 2818 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2819 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2820 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2821
e3d6f909 2822 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2823}
2824
af877292 2825static void target_tmr_work(struct work_struct *work)
c66ac9db 2826{
af877292 2827 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2828 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2829 struct se_tmr_req *tmr = cmd->se_tmr_req;
2830 int ret;
2831
2832 switch (tmr->function) {
5c6cd613 2833 case TMR_ABORT_TASK:
3d28934a 2834 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2835 break;
5c6cd613
NB		 2836 case TMR_ABORT_TASK_SET:
2837 case TMR_CLEAR_ACA:
2838 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2839 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2840 break;
5c6cd613 2841 case TMR_LUN_RESET:
c66ac9db
NB		 2842 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2843 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2844 TMR_FUNCTION_REJECTED;
2845 break;
5c6cd613 2846 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2847 tmr->response = TMR_FUNCTION_REJECTED;
2848 break;
5c6cd613 2849 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2850 tmr->response = TMR_FUNCTION_REJECTED;
2851 break;
c66ac9db 2852 default:
6708bb27 2853 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2854 tmr->function);
2855 tmr->response = TMR_FUNCTION_REJECTED;
2856 break;
2857 }
2858
2859 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2860 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2861
b7b8bef7 2862 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2863}
2864
af877292
CH		 2865int transport_generic_handle_tmr(
2866 struct se_cmd *cmd)
c66ac9db 2867{
af877292
CH		 2868 INIT_WORK(&cmd->work, target_tmr_work);
2869 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2870 return 0;
2871}
af877292 2872EXPORT_SYMBOL(transport_generic_handle_tmr);
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