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[GitHub/LineageOS/android_kernel_samsung_universal7580.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);
d5ddad41 68static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 69static void target_complete_ok_work(struct work_struct *work);
c66ac9db 70
e3d6f909 71int init_se_kmem_caches(void)
c66ac9db 72{
c66ac9db
NB		 73 se_sess_cache = kmem_cache_create("se_sess_cache",
74 sizeof(struct se_session), __alignof__(struct se_session),
75 0, NULL);
6708bb27
AG		 76 if (!se_sess_cache) {
77 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 78 " failed\n");
c8e31f26 79 goto out;
c66ac9db
NB		 80 }
81 se_ua_cache = kmem_cache_create("se_ua_cache",
82 sizeof(struct se_ua), __alignof__(struct se_ua),
83 0, NULL);
6708bb27
AG		 84 if (!se_ua_cache) {
85 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 86 goto out_free_sess_cache;
c66ac9db 87 }
c66ac9db
NB		 88 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
89 sizeof(struct t10_pr_registration),
90 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 91 if (!t10_pr_reg_cache) {
92 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 93 " failed\n");
35e0e757 94 goto out_free_ua_cache;
c66ac9db
NB		 95 }
96 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
97 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
98 0, NULL);
6708bb27
AG		 99 if (!t10_alua_lu_gp_cache) {
100 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 101 " failed\n");
35e0e757 102 goto out_free_pr_reg_cache;
c66ac9db
NB		 103 }
104 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
105 sizeof(struct t10_alua_lu_gp_member),
106 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 107 if (!t10_alua_lu_gp_mem_cache) {
108 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 109 "cache failed\n");
35e0e757 110 goto out_free_lu_gp_cache;
c66ac9db
NB		 111 }
112 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
113 sizeof(struct t10_alua_tg_pt_gp),
114 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 115 if (!t10_alua_tg_pt_gp_cache) {
116 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 117 "cache failed\n");
35e0e757 118 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 119 }
120 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
121 "t10_alua_tg_pt_gp_mem_cache",
122 sizeof(struct t10_alua_tg_pt_gp_member),
123 __alignof__(struct t10_alua_tg_pt_gp_member),
124 0, NULL);
6708bb27
AG		 125 if (!t10_alua_tg_pt_gp_mem_cache) {
126 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 127 "mem_t failed\n");
35e0e757 128 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 129 }
130
35e0e757
CH		 131 target_completion_wq = alloc_workqueue("target_completion",
132 WQ_MEM_RECLAIM, 0);
133 if (!target_completion_wq)
134 goto out_free_tg_pt_gp_mem_cache;
135
c66ac9db 136 return 0;
35e0e757
CH		 137
138out_free_tg_pt_gp_mem_cache:
139 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
140out_free_tg_pt_gp_cache:
141 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
142out_free_lu_gp_mem_cache:
143 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
144out_free_lu_gp_cache:
145 kmem_cache_destroy(t10_alua_lu_gp_cache);
146out_free_pr_reg_cache:
147 kmem_cache_destroy(t10_pr_reg_cache);
148out_free_ua_cache:
149 kmem_cache_destroy(se_ua_cache);
150out_free_sess_cache:
151 kmem_cache_destroy(se_sess_cache);
c66ac9db 152out:
e3d6f909 153 return -ENOMEM;
c66ac9db
NB		 154}
155
e3d6f909 156void release_se_kmem_caches(void)
c66ac9db 157{
35e0e757 158 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 159 kmem_cache_destroy(se_sess_cache);
160 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 161 kmem_cache_destroy(t10_pr_reg_cache);
162 kmem_cache_destroy(t10_alua_lu_gp_cache);
163 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
164 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
165 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 166}
167
e3d6f909
AG		 168/* This code ensures unique mib indexes are handed out. */
169static DEFINE_SPINLOCK(scsi_mib_index_lock);
170static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 171
172/*
173 * Allocate a new row index for the entry type specified
174 */
175u32 scsi_get_new_index(scsi_index_t type)
176{
177 u32 new_index;
178
e3d6f909 179 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 180
e3d6f909
AG		 181 spin_lock(&scsi_mib_index_lock);
182 new_index = ++scsi_mib_index[type];
183 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 184
185 return new_index;
186}
187
dbc5623e 188void transport_subsystem_check_init(void)
c66ac9db
NB		 189{
190 int ret;
283669d2 191 static int sub_api_initialized;
c66ac9db 192
dbc5623e
NB		 193 if (sub_api_initialized)
194 return;
195
c66ac9db
NB		 196 ret = request_module("target_core_iblock");
197 if (ret != 0)
6708bb27 198 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 199
200 ret = request_module("target_core_file");
201 if (ret != 0)
6708bb27 202 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 203
204 ret = request_module("target_core_pscsi");
205 if (ret != 0)
6708bb27 206 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 207
e3d6f909 208 sub_api_initialized = 1;
c66ac9db
NB		 209}
210
211struct se_session *transport_init_session(void)
212{
213 struct se_session *se_sess;
214
215 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 216 if (!se_sess) {
217 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 218 " se_sess_cache\n");
219 return ERR_PTR(-ENOMEM);
220 }
221 INIT_LIST_HEAD(&se_sess->sess_list);
222 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 223 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 224 INIT_LIST_HEAD(&se_sess->sess_wait_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
01bdcde7 491 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 492 return 1;
493 }
f7113a47
CH		 494
495 cmd->transport_state &= ~CMD_T_ACTIVE;
496 if (remove_from_lists) {
497 /*
498 * Some fabric modules like tcm_loop can release
499 * their internally allocated I/O reference now and
500 * struct se_cmd now.
501 *
502 * Fabric modules are expected to return '1' here if the
503 * se_cmd being passed is released at this point,
504 * or zero if not being released.
505 */
506 if (cmd->se_tfo->check_stop_free != NULL) {
507 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
508 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 509 }
f7113a47 510 }
c66ac9db 511
a1d8b49a 512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 513 return 0;
514}
515
516static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
517{
f7113a47 518 return transport_cmd_check_stop(cmd, true);
c66ac9db
NB		 519}
520
521static void transport_lun_remove_cmd(struct se_cmd *cmd)
522{
e3d6f909 523 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 524 unsigned long flags;
525
526 if (!lun)
527 return;
528
a1d8b49a 529 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 530 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
531 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 532 target_remove_from_state_list(cmd);
c66ac9db 533 }
a1d8b49a 534 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 535
c66ac9db 536 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 537 if (!list_empty(&cmd->se_lun_node))
538 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 539 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
540}
541
542void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
543{
c66ac9db
NB		 544 if (transport_cmd_check_stop_to_fabric(cmd))
545 return;
af877292 546 if (remove)
e6a2573f 547 transport_put_cmd(cmd);
c66ac9db
NB		 548}
549
35e0e757
CH		 550static void target_complete_failure_work(struct work_struct *work)
551{
552 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
553
de103c93
CH		 554 transport_generic_request_failure(cmd,
555 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 556}
557
6138ed2a 558/*
d5829eac
PB		 559 * Used when asking transport to copy Sense Data from the underlying
560 * Linux/SCSI struct scsi_cmnd
6138ed2a 561 */
d5829eac 562static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 563{
6138ed2a 564 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 565
566 WARN_ON(!cmd->se_lun);
567
568 if (!dev)
d5829eac 569 return NULL;
6138ed2a 570
d5829eac
PB		 571 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
572 return NULL;
6138ed2a 573
9c58b7dd 574 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 575
d5829eac 576 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 577 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 578 return cmd->sense_buffer;
6138ed2a
PB		 579}
580
5787cacd 581void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 582{
42bf829e 583 struct se_device *dev = cmd->se_dev;
5787cacd 584 int success = scsi_status == GOOD;
c66ac9db 585 unsigned long flags;
c66ac9db 586
5787cacd
CH		 587 cmd->scsi_status = scsi_status;
588
589
a1d8b49a 590 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 591 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 592
c66ac9db 593 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 594 dev->transport->transport_complete(cmd,
595 cmd->t_data_sg,
596 transport_get_sense_buffer(cmd));
597 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 598 success = 1;
c66ac9db
NB		 599 }
600
601 /*
5787cacd 602 * See if we are waiting to complete for an exception condition.
c66ac9db 603 */
cf572a96 604 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 605 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 606 complete(&cmd->task_stop_comp);
c66ac9db
NB		 607 return;
608 }
2235007c
CH		 609
610 if (!success)
7d680f3b 611 cmd->transport_state |= CMD_T_FAILED;
2235007c 612
3d28934a
NB		 613 /*
614 * Check for case where an explict ABORT_TASK has been received
615 * and transport_wait_for_tasks() will be waiting for completion..
616 */
617 if (cmd->transport_state & CMD_T_ABORTED &&
618 cmd->transport_state & CMD_T_STOP) {
619 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
01bdcde7 620 complete_all(&cmd->t_transport_stop_comp);
3d28934a
NB		 621 return;
622 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 623 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 624 } else {
35e0e757 625 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 626 }
35e0e757 627
35e0e757 628 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 629 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 631
35e0e757 632 queue_work(target_completion_wq, &cmd->work);
c66ac9db 633}
6bb35e00
CH		 634EXPORT_SYMBOL(target_complete_cmd);
635
be03ed7c
RD		 636void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
637{
638 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
639 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
640 cmd->residual_count += cmd->data_length - length;
641 } else {
642 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
643 cmd->residual_count = cmd->data_length - length;
644 }
645
646 cmd->data_length = length;
647 }
648
649 target_complete_cmd(cmd, scsi_status);
650}
651EXPORT_SYMBOL(target_complete_cmd_with_length);
652
cf572a96 653static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 654{
cf572a96
CH		 655 struct se_device *dev = cmd->se_dev;
656 unsigned long flags;
c66ac9db 657
cf572a96
CH		 658 spin_lock_irqsave(&dev->execute_task_lock, flags);
659 if (!cmd->state_active) {
660 list_add_tail(&cmd->state_list, &dev->state_list);
661 cmd->state_active = true;
c66ac9db 662 }
cf572a96 663 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 664}
665
07bde79a 666/*
f147abb4 667 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 668 */
7a6f0a1e
CH		 669static void transport_write_pending_qf(struct se_cmd *cmd);
670static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 671
0fd97ccf 672void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 673{
674 struct se_device *dev = container_of(work, struct se_device,
675 qf_work_queue);
bcac364a 676 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 677 struct se_cmd *cmd, *cmd_tmp;
678
679 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 680 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
681 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 682
bcac364a 683 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 684 list_del(&cmd->se_qf_node);
685 atomic_dec(&dev->dev_qf_count);
b81f3e0c 686 smp_mb__after_atomic();
07bde79a 687
6708bb27 688 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 689 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 690 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 691 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
692 : "UNKNOWN");
f7a5cc0b 693
7a6f0a1e
CH		 694 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
695 transport_write_pending_qf(cmd);
696 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
697 transport_complete_qf(cmd);
07bde79a 698 }
07bde79a
NB		 699}
700
c66ac9db
NB		 701unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
702{
703 switch (cmd->data_direction) {
704 case DMA_NONE:
705 return "NONE";
706 case DMA_FROM_DEVICE:
707 return "READ";
708 case DMA_TO_DEVICE:
709 return "WRITE";
710 case DMA_BIDIRECTIONAL:
711 return "BIDI";
712 default:
713 break;
714 }
715
716 return "UNKNOWN";
717}
718
719void transport_dump_dev_state(
720 struct se_device *dev,
721 char *b,
722 int *bl)
723{
724 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 725 if (dev->export_count)
c66ac9db 726 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 727 else
c66ac9db 728 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 729
5f41a31d 730 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 731 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 732 dev->dev_attrib.block_size,
733 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 734 *bl += sprintf(b + *bl, " ");
735}
736
c66ac9db
NB		 737void transport_dump_vpd_proto_id(
738 struct t10_vpd *vpd,
739 unsigned char *p_buf,
740 int p_buf_len)
741{
742 unsigned char buf[VPD_TMP_BUF_SIZE];
743 int len;
744
745 memset(buf, 0, VPD_TMP_BUF_SIZE);
746 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
747
748 switch (vpd->protocol_identifier) {
749 case 0x00:
750 sprintf(buf+len, "Fibre Channel\n");
751 break;
752 case 0x10:
753 sprintf(buf+len, "Parallel SCSI\n");
754 break;
755 case 0x20:
756 sprintf(buf+len, "SSA\n");
757 break;
758 case 0x30:
759 sprintf(buf+len, "IEEE 1394\n");
760 break;
761 case 0x40:
762 sprintf(buf+len, "SCSI Remote Direct Memory Access"
763 " Protocol\n");
764 break;
765 case 0x50:
766 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
767 break;
768 case 0x60:
769 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
770 break;
771 case 0x70:
772 sprintf(buf+len, "Automation/Drive Interface Transport"
773 " Protocol\n");
774 break;
775 case 0x80:
776 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
777 break;
778 default:
779 sprintf(buf+len, "Unknown 0x%02x\n",
780 vpd->protocol_identifier);
781 break;
782 }
783
784 if (p_buf)
785 strncpy(p_buf, buf, p_buf_len);
786 else
6708bb27 787 pr_debug("%s", buf);
c66ac9db
NB		 788}
789
790void
791transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
792{
793 /*
794 * Check if the Protocol Identifier Valid (PIV) bit is set..
795 *
796 * from spc3r23.pdf section 7.5.1
797 */
798 if (page_83[1] & 0x80) {
799 vpd->protocol_identifier = (page_83[0] & 0xf0);
800 vpd->protocol_identifier_set = 1;
801 transport_dump_vpd_proto_id(vpd, NULL, 0);
802 }
803}
804EXPORT_SYMBOL(transport_set_vpd_proto_id);
805
806int transport_dump_vpd_assoc(
807 struct t10_vpd *vpd,
808 unsigned char *p_buf,
809 int p_buf_len)
810{
811 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 812 int ret = 0;
813 int len;
c66ac9db
NB		 814
815 memset(buf, 0, VPD_TMP_BUF_SIZE);
816 len = sprintf(buf, "T10 VPD Identifier Association: ");
817
818 switch (vpd->association) {
819 case 0x00:
820 sprintf(buf+len, "addressed logical unit\n");
821 break;
822 case 0x10:
823 sprintf(buf+len, "target port\n");
824 break;
825 case 0x20:
826 sprintf(buf+len, "SCSI target device\n");
827 break;
828 default:
829 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 830 ret = -EINVAL;
c66ac9db
NB		 831 break;
832 }
833
834 if (p_buf)
835 strncpy(p_buf, buf, p_buf_len);
836 else
6708bb27 837 pr_debug("%s", buf);
c66ac9db
NB		 838
839 return ret;
840}
841
842int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
843{
844 /*
845 * The VPD identification association..
846 *
847 * from spc3r23.pdf Section 7.6.3.1 Table 297
848 */
849 vpd->association = (page_83[1] & 0x30);
850 return transport_dump_vpd_assoc(vpd, NULL, 0);
851}
852EXPORT_SYMBOL(transport_set_vpd_assoc);
853
854int transport_dump_vpd_ident_type(
855 struct t10_vpd *vpd,
856 unsigned char *p_buf,
857 int p_buf_len)
858{
859 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 860 int ret = 0;
861 int len;
c66ac9db
NB		 862
863 memset(buf, 0, VPD_TMP_BUF_SIZE);
864 len = sprintf(buf, "T10 VPD Identifier Type: ");
865
866 switch (vpd->device_identifier_type) {
867 case 0x00:
868 sprintf(buf+len, "Vendor specific\n");
869 break;
870 case 0x01:
871 sprintf(buf+len, "T10 Vendor ID based\n");
872 break;
873 case 0x02:
874 sprintf(buf+len, "EUI-64 based\n");
875 break;
876 case 0x03:
877 sprintf(buf+len, "NAA\n");
878 break;
879 case 0x04:
880 sprintf(buf+len, "Relative target port identifier\n");
881 break;
882 case 0x08:
883 sprintf(buf+len, "SCSI name string\n");
884 break;
885 default:
886 sprintf(buf+len, "Unsupported: 0x%02x\n",
887 vpd->device_identifier_type);
e3d6f909 888 ret = -EINVAL;
c66ac9db
NB		 889 break;
890 }
891
e3d6f909
AG		 892 if (p_buf) {
893 if (p_buf_len < strlen(buf)+1)
894 return -EINVAL;
c66ac9db 895 strncpy(p_buf, buf, p_buf_len);
e3d6f909 896 } else {
6708bb27 897 pr_debug("%s", buf);
e3d6f909 898 }
c66ac9db
NB		 899
900 return ret;
901}
902
903int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
904{
905 /*
906 * The VPD identifier type..
907 *
908 * from spc3r23.pdf Section 7.6.3.1 Table 298
909 */
910 vpd->device_identifier_type = (page_83[1] & 0x0f);
911 return transport_dump_vpd_ident_type(vpd, NULL, 0);
912}
913EXPORT_SYMBOL(transport_set_vpd_ident_type);
914
915int transport_dump_vpd_ident(
916 struct t10_vpd *vpd,
917 unsigned char *p_buf,
918 int p_buf_len)
919{
920 unsigned char buf[VPD_TMP_BUF_SIZE];
921 int ret = 0;
922
923 memset(buf, 0, VPD_TMP_BUF_SIZE);
924
925 switch (vpd->device_identifier_code_set) {
926 case 0x01: /* Binary */
703d641d
DC		 927 snprintf(buf, sizeof(buf),
928 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 929 &vpd->device_identifier[0]);
930 break;
931 case 0x02: /* ASCII */
703d641d
DC		 932 snprintf(buf, sizeof(buf),
933 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 934 &vpd->device_identifier[0]);
935 break;
936 case 0x03: /* UTF-8 */
703d641d
DC		 937 snprintf(buf, sizeof(buf),
938 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 939 &vpd->device_identifier[0]);
940 break;
941 default:
942 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
943 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 944 ret = -EINVAL;
c66ac9db
NB		 945 break;
946 }
947
948 if (p_buf)
949 strncpy(p_buf, buf, p_buf_len);
950 else
6708bb27 951 pr_debug("%s", buf);
c66ac9db
NB		 952
953 return ret;
954}
955
956int
957transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
958{
959 static const char hex_str[] = "0123456789abcdef";
35d1efe8 960 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 961
962 /*
963 * The VPD Code Set (encoding)
964 *
965 * from spc3r23.pdf Section 7.6.3.1 Table 296
966 */
967 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
968 switch (vpd->device_identifier_code_set) {
969 case 0x01: /* Binary */
970 vpd->device_identifier[j++] =
971 hex_str[vpd->device_identifier_type];
972 while (i < (4 + page_83[3])) {
973 vpd->device_identifier[j++] =
974 hex_str[(page_83[i] & 0xf0) >> 4];
975 vpd->device_identifier[j++] =
976 hex_str[page_83[i] & 0x0f];
977 i++;
978 }
979 break;
980 case 0x02: /* ASCII */
981 case 0x03: /* UTF-8 */
982 while (i < (4 + page_83[3]))
983 vpd->device_identifier[j++] = page_83[i++];
984 break;
985 default:
986 break;
987 }
988
989 return transport_dump_vpd_ident(vpd, NULL, 0);
990}
991EXPORT_SYMBOL(transport_set_vpd_ident);
992
de103c93
CH		 993sense_reason_t
994target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 995{
996 struct se_device *dev = cmd->se_dev;
997
998 if (cmd->unknown_data_length) {
999 cmd->data_length = size;
1000 } else if (size != cmd->data_length) {
1001 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1002 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1003 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1004 cmd->data_length, size, cmd->t_task_cdb[0]);
1005
9b3b8041
CH		 1006 if (cmd->data_direction == DMA_TO_DEVICE) {
1007 pr_err("Rejecting underflow/overflow"
1008 " WRITE data\n");
de103c93 1009 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1010 }
1011 /*
1012 * Reject READ_* or WRITE_* with overflow/underflow for
1013 * type SCF_SCSI_DATA_CDB.
1014 */
0fd97ccf 1015 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1016 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1017 " CDB on non 512-byte sector setup subsystem"
1018 " plugin: %s\n", dev->transport->name);
1019 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1020 return TCM_INVALID_CDB_FIELD;
9b3b8041 1021 }
4c054ba6
NB		 1022 /*
1023 * For the overflow case keep the existing fabric provided
1024 * ->data_length. Otherwise for the underflow case, reset
1025 * ->data_length to the smaller SCSI expected data transfer
1026 * length.
1027 */
9b3b8041
CH		 1028 if (size > cmd->data_length) {
1029 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1030 cmd->residual_count = (size - cmd->data_length);
1031 } else {
1032 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1033 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1034 cmd->data_length = size;
9b3b8041 1035 }
9b3b8041
CH		 1036 }
1037
1038 return 0;
1039
9b3b8041
CH		 1040}
1041
c66ac9db
NB		 1042/*
1043 * Used by fabric modules containing a local struct se_cmd within their
1044 * fabric dependent per I/O descriptor.
1045 */
1046void transport_init_se_cmd(
1047 struct se_cmd *cmd,
1048 struct target_core_fabric_ops *tfo,
1049 struct se_session *se_sess,
1050 u32 data_length,
1051 int data_direction,
1052 int task_attr,
1053 unsigned char *sense_buffer)
1054{
5951146d
AG		 1055 INIT_LIST_HEAD(&cmd->se_lun_node);
1056 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1057 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1058 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1059 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1060 init_completion(&cmd->transport_lun_fe_stop_comp);
1061 init_completion(&cmd->transport_lun_stop_comp);
1062 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1063 init_completion(&cmd->cmd_wait_comp);
cf572a96 1064 init_completion(&cmd->task_stop_comp);
a1d8b49a 1065 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1066 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1067
1068 cmd->se_tfo = tfo;
1069 cmd->se_sess = se_sess;
1070 cmd->data_length = data_length;
1071 cmd->data_direction = data_direction;
1072 cmd->sam_task_attr = task_attr;
1073 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1074
1075 cmd->state_active = false;
c66ac9db
NB		 1076}
1077EXPORT_SYMBOL(transport_init_se_cmd);
1078
de103c93
CH		 1079static sense_reason_t
1080transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1081{
019c4ca6
CH		 1082 struct se_device *dev = cmd->se_dev;
1083
c66ac9db
NB		 1084 /*
1085 * Check if SAM Task Attribute emulation is enabled for this
1086 * struct se_device storage object
1087 */
019c4ca6 1088 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1089 return 0;
1090
e66ecd50 1091 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1092 pr_debug("SAM Task Attribute ACA"
c66ac9db 1093 " emulation is not supported\n");
de103c93 1094 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1095 }
1096 /*
1097 * Used to determine when ORDERED commands should go from
1098 * Dormant to Active status.
1099 */
019c4ca6 1100 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
b81f3e0c 1101 smp_mb__after_atomic();
6708bb27 1102 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1103 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1104 dev->transport->name);
c66ac9db
NB		 1105 return 0;
1106}
1107
de103c93
CH		 1108sense_reason_t
1109target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1110{
0fd97ccf 1111 struct se_device *dev = cmd->se_dev;
cb4f4d3c 1112 unsigned long flags;
de103c93 1113 sense_reason_t ret;
c66ac9db 1114
c66ac9db
NB		 1115 /*
1116 * Ensure that the received CDB is less than the max (252 + 8) bytes
1117 * for VARIABLE_LENGTH_CMD
1118 */
1119 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1120 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1121 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1122 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1123 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1124 }
1125 /*
1126 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1127 * allocate the additional extended CDB buffer now.. Otherwise
1128 * setup the pointer from __t_task_cdb to t_task_cdb.
1129 */
a1d8b49a
AG		 1130 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1131 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1132 GFP_KERNEL);
6708bb27
AG		 1133 if (!cmd->t_task_cdb) {
1134 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1135 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1136 scsi_command_size(cdb),
a1d8b49a 1137 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1138 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1139 }
1140 } else
a1d8b49a 1141 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1142 /*
a1d8b49a 1143 * Copy the original CDB into cmd->
c66ac9db 1144 */
a1d8b49a 1145 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1146
1147 /*
1148 * Check for an existing UNIT ATTENTION condition
1149 */
de103c93
CH		 1150 ret = target_scsi3_ua_check(cmd);
1151 if (ret)
1152 return ret;
cb4f4d3c 1153
c87fbd56 1154 ret = target_alua_state_check(cmd);
de103c93
CH		 1155 if (ret)
1156 return ret;
cb4f4d3c 1157
d977f437 1158 ret = target_check_reservation(cmd);
f85eda8d
NB		 1159 if (ret) {
1160 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1161 return ret;
f85eda8d 1162 }
cb4f4d3c 1163
0fd97ccf 1164 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1165 if (ret)
1166 return ret;
1167
1168 ret = transport_check_alloc_task_attr(cmd);
1169 if (ret)
c66ac9db 1170 return ret;
cb4f4d3c
CH		 1171
1172 spin_lock_irqsave(&cmd->t_state_lock, flags);
1173 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1174 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1175
c66ac9db
NB		 1176 spin_lock(&cmd->se_lun->lun_sep_lock);
1177 if (cmd->se_lun->lun_sep)
1178 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1179 spin_unlock(&cmd->se_lun->lun_sep_lock);
1180 return 0;
1181}
a12f41f8 1182EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1183
695434e1
NB		 1184/*
1185 * Used by fabric module frontends to queue tasks directly.
1186 * Many only be used from process context only
1187 */
1188int transport_handle_cdb_direct(
1189 struct se_cmd *cmd)
1190{
de103c93 1191 sense_reason_t ret;
dd8ae59d 1192
695434e1
NB		 1193 if (!cmd->se_lun) {
1194 dump_stack();
6708bb27 1195 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1196 return -EINVAL;
1197 }
1198 if (in_interrupt()) {
1199 dump_stack();
6708bb27 1200 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1201 " from interrupt context\n");
1202 return -EINVAL;
1203 }
dd8ae59d 1204 /*
af877292
CH		 1205 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1206 * outstanding descriptors are handled correctly during shutdown via
1207 * transport_wait_for_tasks()
dd8ae59d
NB		 1208 *
1209 * Also, we don't take cmd->t_state_lock here as we only expect
1210 * this to be called for initial descriptor submission.
1211 */
1212 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1213 cmd->transport_state |= CMD_T_ACTIVE;
1214
dd8ae59d
NB		 1215 /*
1216 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1217 * so follow TRANSPORT_NEW_CMD processing thread context usage
1218 * and call transport_generic_request_failure() if necessary..
1219 */
1220 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1221 if (ret)
1222 transport_generic_request_failure(cmd, ret);
dd8ae59d 1223 return 0;
695434e1
NB		 1224}
1225EXPORT_SYMBOL(transport_handle_cdb_direct);
1226
de103c93
CH		 1227static sense_reason_t
1228transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1229 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1230{
1231 if (!sgl || !sgl_count)
1232 return 0;
1233
1234 /*
1235 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1236 * scatterlists already have been set to follow what the fabric
1237 * passes for the original expected data transfer length.
1238 */
1239 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1240 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1241 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1242 return TCM_INVALID_CDB_FIELD;
1243 }
1244
1245 cmd->t_data_sg = sgl;
1246 cmd->t_data_nents = sgl_count;
1247
1248 if (sgl_bidi && sgl_bidi_count) {
1249 cmd->t_bidi_data_sg = sgl_bidi;
1250 cmd->t_bidi_data_nents = sgl_bidi_count;
1251 }
1252 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1253 return 0;
1254}
1255
a026757f
NB		 1256/*
1257 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1258 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1259 *
1260 * @se_cmd: command descriptor to submit
1261 * @se_sess: associated se_sess for endpoint
1262 * @cdb: pointer to SCSI CDB
1263 * @sense: pointer to SCSI sense buffer
1264 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1265 * @data_length: fabric expected data transfer length
1266 * @task_addr: SAM task attribute
1267 * @data_dir: DMA data direction
1268 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1269 * @sgl: struct scatterlist memory for unidirectional mapping
1270 * @sgl_count: scatterlist count for unidirectional mapping
1271 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1272 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1273 *
d6dfc868
RD		 1274 * Returns non zero to signal active I/O shutdown failure. All other
1275 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1276 * but still return zero here.
1277 *
a6360785
NB		 1278 * This may only be called from process context, and also currently
1279 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1280 */
1281int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1282 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1283 u32 data_length, int task_attr, int data_dir, int flags,
1284 struct scatterlist *sgl, u32 sgl_count,
1285 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1286{
1287 struct se_portal_group *se_tpg;
de103c93
CH		 1288 sense_reason_t rc;
1289 int ret;
a6360785
NB		 1290
1291 se_tpg = se_sess->se_tpg;
1292 BUG_ON(!se_tpg);
1293 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1294 BUG_ON(in_interrupt());
1295 /*
1296 * Initialize se_cmd for target operation. From this point
1297 * exceptions are handled by sending exception status via
1298 * target_core_fabric_ops->queue_status() callback
1299 */
1300 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1301 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1302 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1303 se_cmd->unknown_data_length = 1;
a6360785
NB		 1304 /*
1305 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1306 * se_sess->sess_cmd_list. A second kref_get here is necessary
1307 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1308 * kref_put() to happen during fabric packet acknowledgement.
1309 */
de103c93
CH		 1310 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1311 if (ret)
1312 return ret;
a6360785
NB		 1313 /*
1314 * Signal bidirectional data payloads to target-core
1315 */
1316 if (flags & TARGET_SCF_BIDI_OP)
1317 se_cmd->se_cmd_flags |= SCF_BIDI;
1318 /*
1319 * Locate se_lun pointer and attach it to struct se_cmd
1320 */
de103c93
CH		 1321 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1322 if (rc) {
1323 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1324 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1325 return 0;
735703ca 1326 }
d6e0175c 1327
a12f41f8 1328 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1329 if (rc != 0) {
de103c93 1330 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1331 return 0;
735703ca 1332 }
a026757f
NB		 1333 /*
1334 * When a non zero sgl_count has been passed perform SGL passthrough
1335 * mapping for pre-allocated fabric memory instead of having target
1336 * core perform an internal SGL allocation..
1337 */
1338 if (sgl_count != 0) {
1339 BUG_ON(!sgl);
1340
944981c7
NB		 1341 /*
1342 * A work-around for tcm_loop as some userspace code via
1343 * scsi-generic do not memset their associated read buffers,
1344 * so go ahead and do that here for type non-data CDBs. Also
1345 * note that this is currently guaranteed to be a single SGL
1346 * for this case by target core in target_setup_cmd_from_cdb()
1347 * -> transport_generic_cmd_sequencer().
1348 */
1349 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1350 se_cmd->data_direction == DMA_FROM_DEVICE) {
1351 unsigned char *buf = NULL;
1352
1353 if (sgl)
1354 buf = kmap(sg_page(sgl)) + sgl->offset;
1355
1356 if (buf) {
1357 memset(buf, 0, sgl->length);
1358 kunmap(sg_page(sgl));
1359 }
1360 }
1361
a026757f
NB		 1362 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1363 sgl_bidi, sgl_bidi_count);
1364 if (rc != 0) {
de103c93 1365 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1366 return 0;
1367 }
1368 }
11e319ed
AG		 1369 /*
1370 * Check if we need to delay processing because of ALUA
1371 * Active/NonOptimized primary access state..
1372 */
1373 core_alua_check_nonop_delay(se_cmd);
1374
a6360785 1375 transport_handle_cdb_direct(se_cmd);
d6dfc868 1376 return 0;
a6360785 1377}
a026757f
NB		 1378EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1379
1380/*
1381 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1382 *
1383 * @se_cmd: command descriptor to submit
1384 * @se_sess: associated se_sess for endpoint
1385 * @cdb: pointer to SCSI CDB
1386 * @sense: pointer to SCSI sense buffer
1387 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1388 * @data_length: fabric expected data transfer length
1389 * @task_addr: SAM task attribute
1390 * @data_dir: DMA data direction
1391 * @flags: flags for command submission from target_sc_flags_tables
1392 *
1393 * Returns non zero to signal active I/O shutdown failure. All other
1394 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1395 * but still return zero here.
1396 *
1397 * This may only be called from process context, and also currently
1398 * assumes internal allocation of fabric payload buffer by target-core.
1399 *
1400 * It also assumes interal target core SGL memory allocation.
1401 */
1402int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1403 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1404 u32 data_length, int task_attr, int data_dir, int flags)
1405{
1406 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1407 unpacked_lun, data_length, task_attr, data_dir,
1408 flags, NULL, 0, NULL, 0);
1409}
a6360785
NB		 1410EXPORT_SYMBOL(target_submit_cmd);
1411
9f0d05c2
NB		 1412static void target_complete_tmr_failure(struct work_struct *work)
1413{
1414 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1415
1416 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1417 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1418
1419 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1420}
1421
ea98d7f9
AG		 1422/**
1423 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1424 * for TMR CDBs
1425 *
1426 * @se_cmd: command descriptor to submit
1427 * @se_sess: associated se_sess for endpoint
1428 * @sense: pointer to SCSI sense buffer
1429 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1430 * @fabric_context: fabric context for TMR req
1431 * @tm_type: Type of TM request
c0974f89
NB		 1432 * @gfp: gfp type for caller
1433 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1434 * @flags: submit cmd flags
ea98d7f9
AG		 1435 *
1436 * Callable from all contexts.
1437 **/
1438
c7042cae 1439int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1440 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1441 void *fabric_tmr_ptr, unsigned char tm_type,
1442 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1443{
1444 struct se_portal_group *se_tpg;
1445 int ret;
1446
1447 se_tpg = se_sess->se_tpg;
1448 BUG_ON(!se_tpg);
1449
1450 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1451 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1452 /*
1453 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1454 * allocation failure.
1455 */
c0974f89 1456 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1457 if (ret < 0)
1458 return -ENOMEM;
ea98d7f9 1459
c0974f89
NB		 1460 if (tm_type == TMR_ABORT_TASK)
1461 se_cmd->se_tmr_req->ref_task_tag = tag;
1462
ea98d7f9 1463 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1464 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1465 if (ret) {
1466 core_tmr_release_req(se_cmd->se_tmr_req);
1467 return ret;
1468 }
ea98d7f9 1469
ea98d7f9
AG		 1470 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1471 if (ret) {
9f0d05c2
NB		 1472 /*
1473 * For callback during failure handling, push this work off
1474 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1475 */
1476 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1477 schedule_work(&se_cmd->work);
c7042cae 1478 return 0;
ea98d7f9
AG		 1479 }
1480 transport_generic_handle_tmr(se_cmd);
c7042cae 1481 return 0;
ea98d7f9
AG		 1482}
1483EXPORT_SYMBOL(target_submit_tmr);
1484
cdbb70bb 1485/*
cf572a96 1486 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1487 * has completed.
1488 */
cf572a96 1489bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1490{
cdbb70bb
CH		 1491 bool was_active = false;
1492
cf572a96
CH		 1493 if (cmd->transport_state & CMD_T_BUSY) {
1494 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1495 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1496
cf572a96
CH		 1497 pr_debug("cmd %p waiting to complete\n", cmd);
1498 wait_for_completion(&cmd->task_stop_comp);
1499 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1500
1501 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1502 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1503 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1504 was_active = true;
1505 }
1506
cdbb70bb
CH		 1507 return was_active;
1508}
1509
c66ac9db
NB		 1510/*
1511 * Handle SAM-esque emulation for generic transport request failures.
1512 */
de103c93
CH		 1513void transport_generic_request_failure(struct se_cmd *cmd,
1514 sense_reason_t sense_reason)
c66ac9db 1515{
07bde79a
NB		 1516 int ret = 0;
1517
6708bb27 1518 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1519 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1520 cmd->t_task_cdb[0]);
de103c93 1521 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1522 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1523 cmd->t_state, sense_reason);
d43d6aea 1524 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1525 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1526 (cmd->transport_state & CMD_T_STOP) != 0,
1527 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1528
c66ac9db
NB		 1529 /*
1530 * For SAM Task Attribute emulation for failed struct se_cmd
1531 */
019c4ca6 1532 transport_complete_task_attr(cmd);
c66ac9db 1533
de103c93 1534 switch (sense_reason) {
03e98c9e
NB		 1535 case TCM_NON_EXISTENT_LUN:
1536 case TCM_UNSUPPORTED_SCSI_OPCODE:
1537 case TCM_INVALID_CDB_FIELD:
1538 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1539 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1540 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1541 case TCM_UNKNOWN_MODE_PAGE:
1542 case TCM_WRITE_PROTECTED:
e2397c70 1543 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1544 case TCM_CHECK_CONDITION_ABORT_CMD:
1545 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1546 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1547 break;
de103c93
CH		 1548 case TCM_OUT_OF_RESOURCES:
1549 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1550 break;
03e98c9e 1551 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1552 /*
1553 * No SENSE Data payload for this case, set SCSI Status
1554 * and queue the response to $FABRIC_MOD.
1555 *
1556 * Uses linux/include/scsi/scsi.h SAM status codes defs
1557 */
1558 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1559 /*
1560 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1561 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1562 * CONFLICT STATUS.
1563 *
1564 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1565 */
e3d6f909 1566 if (cmd->se_sess &&
0fd97ccf 1567 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1568 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1569 cmd->orig_fe_lun, 0x2C,
1570 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1571
07bde79a 1572 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1573 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1574 goto queue_full;
c66ac9db 1575 goto check_stop;
c66ac9db 1576 default:
6708bb27 1577 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1578 cmd->t_task_cdb[0], sense_reason);
1579 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1580 break;
1581 }
f3146437 1582
de103c93 1583 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1584 if (ret == -EAGAIN || ret == -ENOMEM)
1585 goto queue_full;
07bde79a 1586
c66ac9db
NB		 1587check_stop:
1588 transport_lun_remove_cmd(cmd);
6708bb27 1589 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1590 ;
07bde79a
NB		 1591 return;
1592
1593queue_full:
e057f533
CH		 1594 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1595 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1596}
2fbff127 1597EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1598
5f41a31d 1599static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1600{
de103c93 1601 sense_reason_t ret;
5f41a31d
CH		 1602
1603 spin_lock_irq(&cmd->t_state_lock);
1604 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1605 spin_unlock_irq(&cmd->t_state_lock);
1606
de103c93
CH		 1607 if (cmd->execute_cmd) {
1608 ret = cmd->execute_cmd(cmd);
1609 if (ret) {
1610 spin_lock_irq(&cmd->t_state_lock);
1611 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1612 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1613
de103c93
CH		 1614 transport_generic_request_failure(cmd, ret);
1615 }
5f41a31d
CH		 1616 }
1617}
1618
019c4ca6 1619static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1620{
1621 struct se_device *dev = cmd->se_dev;
1622
019c4ca6
CH		 1623 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1624 return false;
5f41a31d 1625
c66ac9db 1626 /*
25985edc 1627 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1628 * to allow the passed struct se_cmd list of tasks to the front of the list.
1629 */
5f41a31d
CH		 1630 switch (cmd->sam_task_attr) {
1631 case MSG_HEAD_TAG:
1632 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1633 "se_ordered_id: %u\n",
1634 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1635 return false;
5f41a31d
CH		 1636 case MSG_ORDERED_TAG:
1637 atomic_inc(&dev->dev_ordered_sync);
b81f3e0c 1638 smp_mb__after_atomic();
c66ac9db 1639
5f41a31d
CH		 1640 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1641 " se_ordered_id: %u\n",
1642 cmd->t_task_cdb[0], cmd->se_ordered_id);
1643
c66ac9db 1644 /*
5f41a31d
CH		 1645 * Execute an ORDERED command if no other older commands
1646 * exist that need to be completed first.
c66ac9db 1647 */
5f41a31d 1648 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1649 return false;
5f41a31d
CH		 1650 break;
1651 default:
c66ac9db
NB		 1652 /*
1653 * For SIMPLE and UNTAGGED Task Attribute commands
1654 */
5f41a31d 1655 atomic_inc(&dev->simple_cmds);
b81f3e0c 1656 smp_mb__after_atomic();
5f41a31d 1657 break;
c66ac9db 1658 }
5f41a31d 1659
019c4ca6
CH		 1660 if (atomic_read(&dev->dev_ordered_sync) == 0)
1661 return false;
c66ac9db 1662
019c4ca6
CH		 1663 spin_lock(&dev->delayed_cmd_lock);
1664 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1665 spin_unlock(&dev->delayed_cmd_lock);
1666
1667 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1668 " delayed CMD list, se_ordered_id: %u\n",
1669 cmd->t_task_cdb[0], cmd->sam_task_attr,
1670 cmd->se_ordered_id);
1671 return true;
1672}
1673
1674void target_execute_cmd(struct se_cmd *cmd)
1675{
1676 /*
1677 * If the received CDB has aleady been aborted stop processing it here.
1678 */
5bd665f2
LT		 1679 if (transport_check_aborted_status(cmd, 1)) {
1680 complete(&cmd->transport_lun_stop_comp);
5f41a31d 1681 return;
c66ac9db 1682 }
c66ac9db 1683
c66ac9db 1684 /*
019c4ca6
CH		 1685 * Determine if IOCTL context caller in requesting the stopping of this
1686 * command for LUN shutdown purposes.
c66ac9db 1687 */
019c4ca6
CH		 1688 spin_lock_irq(&cmd->t_state_lock);
1689 if (cmd->transport_state & CMD_T_LUN_STOP) {
1690 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1691 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1692
1693 cmd->transport_state &= ~CMD_T_ACTIVE;
1694 spin_unlock_irq(&cmd->t_state_lock);
1695 complete(&cmd->transport_lun_stop_comp);
1696 return;
1697 }
1698 /*
1699 * Determine if frontend context caller is requesting the stopping of
1700 * this command for frontend exceptions.
1701 */
1702 if (cmd->transport_state & CMD_T_STOP) {
1703 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1704 __func__, __LINE__,
1705 cmd->se_tfo->get_task_tag(cmd));
1706
1707 spin_unlock_irq(&cmd->t_state_lock);
01bdcde7 1708 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1709 return;
1710 }
1711
1712 cmd->t_state = TRANSPORT_PROCESSING;
e627c615 1713 cmd->transport_state |= CMD_T_ACTIVE;
019c4ca6
CH		 1714 spin_unlock_irq(&cmd->t_state_lock);
1715
1716 if (!target_handle_task_attr(cmd))
1717 __target_execute_cmd(cmd);
c66ac9db 1718}
70baf0ab 1719EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1720
5f41a31d
CH		 1721/*
1722 * Process all commands up to the last received ORDERED task attribute which
1723 * requires another blocking boundary
1724 */
1725static void target_restart_delayed_cmds(struct se_device *dev)
1726{
1727 for (;;) {
1728 struct se_cmd *cmd;
1729
1730 spin_lock(&dev->delayed_cmd_lock);
1731 if (list_empty(&dev->delayed_cmd_list)) {
1732 spin_unlock(&dev->delayed_cmd_lock);
1733 break;
1734 }
1735
1736 cmd = list_entry(dev->delayed_cmd_list.next,
1737 struct se_cmd, se_delayed_node);
1738 list_del(&cmd->se_delayed_node);
1739 spin_unlock(&dev->delayed_cmd_lock);
1740
1741 __target_execute_cmd(cmd);
1742
1743 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1744 break;
1745 }
1746}
1747
c66ac9db 1748/*
35e0e757 1749 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1750 * and ordered cmds need to have their tasks added to the execution queue.
1751 */
1752static void transport_complete_task_attr(struct se_cmd *cmd)
1753{
5951146d 1754 struct se_device *dev = cmd->se_dev;
c66ac9db 1755
019c4ca6
CH		 1756 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1757 return;
1758
e66ecd50 1759 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db 1760 atomic_dec(&dev->simple_cmds);
b81f3e0c 1761 smp_mb__after_atomic();
c66ac9db 1762 dev->dev_cur_ordered_id++;
6708bb27 1763 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1764 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1765 cmd->se_ordered_id);
e66ecd50 1766 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1767 dev->dev_cur_ordered_id++;
6708bb27 1768 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1769 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1770 cmd->se_ordered_id);
e66ecd50 1771 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 1772 atomic_dec(&dev->dev_ordered_sync);
b81f3e0c 1773 smp_mb__after_atomic();
c66ac9db
NB		 1774
1775 dev->dev_cur_ordered_id++;
6708bb27 1776 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1777 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1778 }
c66ac9db 1779
5f41a31d 1780 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1781}
1782
e057f533 1783static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1784{
1785 int ret = 0;
1786
019c4ca6 1787 transport_complete_task_attr(cmd);
e057f533
CH		 1788
1789 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1790 ret = cmd->se_tfo->queue_status(cmd);
b036d398 1791 goto out;
e057f533 1792 }
07bde79a
NB		 1793
1794 switch (cmd->data_direction) {
1795 case DMA_FROM_DEVICE:
1796 ret = cmd->se_tfo->queue_data_in(cmd);
1797 break;
1798 case DMA_TO_DEVICE:
ec98f782 1799 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 1800 ret = cmd->se_tfo->queue_data_in(cmd);
1801 if (ret < 0)
e057f533 1802 break;
07bde79a
NB		 1803 }
1804 /* Fall through for DMA_TO_DEVICE */
1805 case DMA_NONE:
1806 ret = cmd->se_tfo->queue_status(cmd);
1807 break;
1808 default:
1809 break;
1810 }
1811
e057f533
CH		 1812out:
1813 if (ret < 0) {
1814 transport_handle_queue_full(cmd, cmd->se_dev);
1815 return;
1816 }
1817 transport_lun_remove_cmd(cmd);
1818 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1819}
1820
1821static void transport_handle_queue_full(
1822 struct se_cmd *cmd,
e057f533 1823 struct se_device *dev)
07bde79a
NB		 1824{
1825 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1826 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1827 atomic_inc(&dev->dev_qf_count);
b81f3e0c 1828 smp_mb__after_atomic();
07bde79a
NB		 1829 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1830
1831 schedule_work(&cmd->se_dev->qf_work_queue);
1832}
1833
35e0e757 1834static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1835{
35e0e757 1836 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1837 int ret;
35e0e757 1838
c66ac9db
NB		 1839 /*
1840 * Check if we need to move delayed/dormant tasks from cmds on the
1841 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1842 * Attribute.
1843 */
019c4ca6
CH		 1844 transport_complete_task_attr(cmd);
1845
07bde79a
NB		 1846 /*
1847 * Check to schedule QUEUE_FULL work, or execute an existing
1848 * cmd->transport_qf_callback()
1849 */
1850 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1851 schedule_work(&cmd->se_dev->qf_work_queue);
1852
c66ac9db 1853 /*
d5829eac 1854 * Check if we need to send a sense buffer from
c66ac9db
NB		 1855 * the struct se_cmd in question.
1856 */
1857 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1858 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1859 ret = transport_send_check_condition_and_sense(
1860 cmd, 0, 1);
1861 if (ret == -EAGAIN || ret == -ENOMEM)
1862 goto queue_full;
1863
1864 transport_lun_remove_cmd(cmd);
1865 transport_cmd_check_stop_to_fabric(cmd);
1866 return;
c66ac9db
NB		 1867 }
1868 /*
25985edc 1869 * Check for a callback, used by amongst other things
c66ac9db
NB		 1870 * XDWRITE_READ_10 emulation.
1871 */
1872 if (cmd->transport_complete_callback)
1873 cmd->transport_complete_callback(cmd);
1874
1875 switch (cmd->data_direction) {
1876 case DMA_FROM_DEVICE:
1877 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1878 if (cmd->se_lun->lun_sep) {
1879 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1880 cmd->data_length;
1881 }
1882 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1883
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 case DMA_TO_DEVICE:
1889 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1890 if (cmd->se_lun->lun_sep) {
1891 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1892 cmd->data_length;
1893 }
1894 spin_unlock(&cmd->se_lun->lun_sep_lock);
1895 /*
1896 * Check if we need to send READ payload for BIDI-COMMAND
1897 */
ec98f782 1898 if (cmd->t_bidi_data_sg) {
c66ac9db 1899 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1900 if (cmd->se_lun->lun_sep) {
1901 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1902 cmd->data_length;
1903 }
1904 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1905 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1906 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1907 goto queue_full;
c66ac9db
NB		 1908 break;
1909 }
1910 /* Fall through for DMA_TO_DEVICE */
1911 case DMA_NONE:
07bde79a 1912 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1913 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1914 goto queue_full;
c66ac9db
NB		 1915 break;
1916 default:
1917 break;
1918 }
1919
1920 transport_lun_remove_cmd(cmd);
1921 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1922 return;
1923
1924queue_full:
6708bb27 1925 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1926 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1927 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1928 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1929}
1930
6708bb27 1931static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 1932{
ec98f782 1933 struct scatterlist *sg;
ec98f782 1934 int count;
c66ac9db 1935
6708bb27
AG		 1936 for_each_sg(sgl, sg, nents, count)
1937 __free_page(sg_page(sg));
c66ac9db 1938
6708bb27
AG		 1939 kfree(sgl);
1940}
c66ac9db 1941
6708bb27
AG		 1942static inline void transport_free_pages(struct se_cmd *cmd)
1943{
1944 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
1945 return;
1946
1947 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 1948 cmd->t_data_sg = NULL;
1949 cmd->t_data_nents = 0;
c66ac9db 1950
6708bb27 1951 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 1952 cmd->t_bidi_data_sg = NULL;
1953 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 1954}
1955
e26d99ae
CH		 1956/**
1957 * transport_release_cmd - free a command
1958 * @cmd: command to free
1959 *
1960 * This routine unconditionally frees a command, and reference counting
1961 * or list removal must be done in the caller.
1962 */
d5ddad41 1963static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 1964{
1965 BUG_ON(!cmd->se_tfo);
1966
c8e31f26 1967 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 1968 core_tmr_release_req(cmd->se_tmr_req);
1969 if (cmd->t_task_cdb != cmd->__t_task_cdb)
1970 kfree(cmd->t_task_cdb);
1971 /*
7481deb4
NB		 1972 * If this cmd has been setup with target_get_sess_cmd(), drop
1973 * the kref and call ->release_cmd() in kref callback.
e26d99ae 1974 */
d5ddad41
NB		 1975 if (cmd->check_release != 0)
1976 return target_put_sess_cmd(cmd->se_sess, cmd);
1977
e26d99ae 1978 cmd->se_tfo->release_cmd(cmd);
d5ddad41 1979 return 1;
e26d99ae
CH		 1980}
1981
d3df7825
CH		 1982/**
1983 * transport_put_cmd - release a reference to a command
1984 * @cmd: command to release
1985 *
1986 * This routine releases our reference to the command and frees it if possible.
1987 */
d5ddad41 1988static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 1989{
1990 unsigned long flags;
c66ac9db 1991
a1d8b49a 1992 spin_lock_irqsave(&cmd->t_state_lock, flags);
d9ed6947
RD		 1993 if (atomic_read(&cmd->t_fe_count) &&
1994 !atomic_dec_and_test(&cmd->t_fe_count)) {
1995 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
d5ddad41 1996 return 0;
4911e3cc
CH		 1997 }
1998
7d680f3b
CH		 1999 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2000 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2001 target_remove_from_state_list(cmd);
c66ac9db 2002 }
a1d8b49a 2003 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2004
c66ac9db 2005 transport_free_pages(cmd);
d5ddad41 2006 return transport_release_cmd(cmd);
c66ac9db 2007}
c66ac9db 2008
4949314c 2009void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2010{
ec98f782 2011 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2012 struct page **pages;
2013 int i;
05d1c7c0
AG		 2014
2015 /*
ec98f782
AG		 2016 * We need to take into account a possible offset here for fabrics like
2017 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2018 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2019 */
4949314c
AG		 2020 if (!cmd->t_data_nents)
2021 return NULL;
3717ef0c
PB		 2022
2023 BUG_ON(!sg);
2024 if (cmd->t_data_nents == 1)
4949314c
AG		 2025 return kmap(sg_page(sg)) + sg->offset;
2026
2027 /* >1 page. use vmap */
2028 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2029 if (!pages)
4949314c
AG		 2030 return NULL;
2031
2032 /* convert sg[] to pages[] */
2033 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2034 pages[i] = sg_page(sg);
2035 }
2036
2037 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2038 kfree(pages);
de103c93 2039 if (!cmd->t_data_vmap)
4949314c
AG		 2040 return NULL;
2041
2042 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2043}
4949314c 2044EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2045
4949314c 2046void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2047{
a1edf9cf 2048 if (!cmd->t_data_nents) {
4949314c 2049 return;
a1edf9cf 2050 } else if (cmd->t_data_nents == 1) {
4949314c 2051 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2052 return;
2053 }
4949314c
AG		 2054
2055 vunmap(cmd->t_data_vmap);
2056 cmd->t_data_vmap = NULL;
05d1c7c0 2057}
4949314c 2058EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2059
c66ac9db 2060static int
05d1c7c0 2061transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2062{
ec98f782
AG		 2063 u32 length = cmd->data_length;
2064 unsigned int nents;
2065 struct page *page;
9db9da33 2066 gfp_t zero_flag;
ec98f782 2067 int i = 0;
c66ac9db 2068
ec98f782
AG		 2069 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2070 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2071 if (!cmd->t_data_sg)
2072 return -ENOMEM;
c66ac9db 2073
ec98f782
AG		 2074 cmd->t_data_nents = nents;
2075 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2076
64f1db38 2077 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2078
ec98f782
AG		 2079 while (length) {
2080 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2081 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2082 if (!page)
2083 goto out;
c66ac9db 2084
ec98f782
AG		 2085 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2086 length -= page_len;
2087 i++;
c66ac9db 2088 }
c66ac9db 2089 return 0;
c66ac9db 2090
ec98f782 2091out:
d0e27c88 2092 while (i > 0) {
ec98f782 2093 i--;
d0e27c88 2094 __free_page(sg_page(&cmd->t_data_sg[i]));
c66ac9db 2095 }
ec98f782
AG		 2096 kfree(cmd->t_data_sg);
2097 cmd->t_data_sg = NULL;
2098 return -ENOMEM;
c66ac9db
NB		 2099}
2100
da0f7619 2101/*
b16a35b0
AG		 2102 * Allocate any required resources to execute the command. For writes we
2103 * might not have the payload yet, so notify the fabric via a call to
2104 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2105 */
de103c93
CH		 2106sense_reason_t
2107transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2108{
c66ac9db
NB		 2109 int ret = 0;
2110
2111 /*
2112 * Determine is the TCM fabric module has already allocated physical
2113 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2114 * beforehand.
c66ac9db 2115 */
ec98f782
AG		 2116 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2117 cmd->data_length) {
05d1c7c0 2118 ret = transport_generic_get_mem(cmd);
c66ac9db 2119 if (ret < 0)
de103c93 2120 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2121 }
da0f7619 2122
4101f0a8 2123 atomic_inc(&cmd->t_fe_count);
4101f0a8 2124
c66ac9db 2125 /*
c3196f0c
CH		 2126 * If this command is not a write we can execute it right here,
2127 * for write buffers we need to notify the fabric driver first
2128 * and let it call back once the write buffers are ready.
c66ac9db 2129 */
5f41a31d 2130 target_add_to_state_list(cmd);
5a6ca32c 2131 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2132 target_execute_cmd(cmd);
2133 return 0;
2134 }
2135
2136 spin_lock_irq(&cmd->t_state_lock);
2137 cmd->t_state = TRANSPORT_WRITE_PENDING;
2138 spin_unlock_irq(&cmd->t_state_lock);
2139
2140 transport_cmd_check_stop(cmd, false);
2141
2142 ret = cmd->se_tfo->write_pending(cmd);
2143 if (ret == -EAGAIN || ret == -ENOMEM)
2144 goto queue_full;
2145
de103c93
CH		 2146 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2147 WARN_ON(ret);
2148
b69c1fcf 2149 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2150
c3196f0c
CH		 2151queue_full:
2152 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2153 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2154 transport_handle_queue_full(cmd, cmd->se_dev);
2155 return 0;
c66ac9db 2156}
a1d8b49a 2157EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2158
e057f533 2159static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2160{
f147abb4
NB		 2161 int ret;
2162
2163 ret = cmd->se_tfo->write_pending(cmd);
2164 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2165 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2166 cmd);
2167 transport_handle_queue_full(cmd, cmd->se_dev);
2168 }
07bde79a
NB		 2169}
2170
d5ddad41 2171int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2172{
d5ddad41
NB		 2173 int ret = 0;
2174
d14921d6 2175 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2176 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2177 transport_wait_for_tasks(cmd);
2178
d5ddad41 2179 ret = transport_release_cmd(cmd);
d14921d6
NB		 2180 } else {
2181 if (wait_for_tasks)
2182 transport_wait_for_tasks(cmd);
2183
82f1c8a4 2184 if (cmd->se_lun)
c66ac9db 2185 transport_lun_remove_cmd(cmd);
c66ac9db 2186
d5ddad41 2187 ret = transport_put_cmd(cmd);
c66ac9db 2188 }
d5ddad41 2189 return ret;
c66ac9db
NB		 2190}
2191EXPORT_SYMBOL(transport_generic_free_cmd);
2192
a17f091d
NB		 2193/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2194 * @se_sess: session to reference
2195 * @se_cmd: command descriptor to add
a6360785 2196 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2197 */
20361e69 2198int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2199 bool ack_kref)
a17f091d
NB		 2200{
2201 unsigned long flags;
bc187ea6 2202 int ret = 0;
a17f091d 2203
7481deb4 2204 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2205 /*
2206 * Add a second kref if the fabric caller is expecting to handle
2207 * fabric acknowledgement that requires two target_put_sess_cmd()
2208 * invocations before se_cmd descriptor release.
2209 */
86715569 2210 if (ack_kref == true) {
a6360785 2211 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2212 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2213 }
7481deb4 2214
a17f091d 2215 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2216 if (se_sess->sess_tearing_down) {
2217 ret = -ESHUTDOWN;
2218 goto out;
2219 }
a17f091d
NB		 2220 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2221 se_cmd->check_release = 1;
bc187ea6
RD		 2222
2223out:
a17f091d 2224 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
32e10af8
BVA		 2225
2226 if (ret && ack_kref)
2227 target_put_sess_cmd(se_sess, se_cmd);
2228
bc187ea6 2229 return ret;
a17f091d 2230}
20361e69 2231EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2232
7481deb4 2233static void target_release_cmd_kref(struct kref *kref)
a17f091d 2234{
7481deb4
NB		 2235 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2236 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2237
a17f091d 2238 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2239 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2240 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2241 return;
a17f091d 2242 }
a17f091d 2243 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2244 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2245 complete(&se_cmd->cmd_wait_comp);
7481deb4 2246 return;
a17f091d
NB		 2247 }
2248 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2249 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2250
7481deb4
NB		 2251 se_cmd->se_tfo->release_cmd(se_cmd);
2252}
2253
2254/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2255 * @se_sess: session to reference
2256 * @se_cmd: command descriptor to drop
2257 */
2258int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2259{
ccf5ae83
JE		 2260 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2261 &se_sess->sess_cmd_lock);
a17f091d
NB		 2262}
2263EXPORT_SYMBOL(target_put_sess_cmd);
2264
1c7b13fe
RD		 2265/* target_sess_cmd_list_set_waiting - Flag all commands in
2266 * sess_cmd_list to complete cmd_wait_comp. Set
2267 * sess_tearing_down so no more commands are queued.
2268 * @se_sess: session to flag
a17f091d 2269 */
1c7b13fe 2270void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2271{
2272 struct se_cmd *se_cmd;
2273 unsigned long flags;
2274
a17f091d 2275 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2276 if (se_sess->sess_tearing_down) {
2277 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2278 return;
2279 }
1c7b13fe 2280 se_sess->sess_tearing_down = 1;
9b31a328 2281 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2282
9b31a328 2283 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2284 se_cmd->cmd_wait_set = 1;
2285
2286 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2287}
1c7b13fe 2288EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2289
2290/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2291 * @se_sess: session to wait for active I/O
a17f091d 2292 */
be646c2d 2293void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2294{
2295 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2296 unsigned long flags;
a17f091d
NB		 2297
2298 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2299 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2300 list_del(&se_cmd->se_cmd_list);
2301
2302 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2303 " %d\n", se_cmd, se_cmd->t_state,
2304 se_cmd->se_tfo->get_cmd_state(se_cmd));
2305
be646c2d
JE		 2306 wait_for_completion(&se_cmd->cmd_wait_comp);
2307 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2308 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2309 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2310
2311 se_cmd->se_tfo->release_cmd(se_cmd);
2312 }
9b31a328
NB		 2313
2314 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2315 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2316 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2317
a17f091d
NB		 2318}
2319EXPORT_SYMBOL(target_wait_for_sess_cmds);
2320
c66ac9db
NB		 2321/* transport_lun_wait_for_tasks():
2322 *
2323 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2324 * an struct se_lun to be successfully shutdown.
2325 */
2326static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2327{
2328 unsigned long flags;
cf572a96
CH		 2329 int ret = 0;
2330
c66ac9db
NB		 2331 /*
2332 * If the frontend has already requested this struct se_cmd to
2333 * be stopped, we can safely ignore this struct se_cmd.
2334 */
a1d8b49a 2335 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2336 if (cmd->transport_state & CMD_T_STOP) {
2337 cmd->transport_state &= ~CMD_T_LUN_STOP;
2338
2339 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2340 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2341 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2342 transport_cmd_check_stop(cmd, false);
e3d6f909 2343 return -EPERM;
c66ac9db 2344 }
7d680f3b 2345 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2346 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2347
cf572a96
CH		 2348 // XXX: audit task_flags checks.
2349 spin_lock_irqsave(&cmd->t_state_lock, flags);
2350 if ((cmd->transport_state & CMD_T_BUSY) &&
2351 (cmd->transport_state & CMD_T_SENT)) {
2352 if (!target_stop_cmd(cmd, &flags))
2353 ret++;
cf572a96 2354 }
5f41a31d 2355 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2356
785fdf70
CH		 2357 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2358 " %d\n", cmd, ret);
c66ac9db 2359 if (!ret) {
6708bb27 2360 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2361 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2362 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2363 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2364 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2365 }
c66ac9db
NB		 2366
2367 return 0;
2368}
2369
c66ac9db
NB		 2370static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2371{
2372 struct se_cmd *cmd = NULL;
2373 unsigned long lun_flags, cmd_flags;
2374 /*
2375 * Do exception processing and return CHECK_CONDITION status to the
2376 * Initiator Port.
2377 */
2378 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2379 while (!list_empty(&lun->lun_cmd_list)) {
2380 cmd = list_first_entry(&lun->lun_cmd_list,
2381 struct se_cmd, se_lun_node);
3d26fea0 2382 list_del_init(&cmd->se_lun_node);
5951146d 2383
a1d8b49a 2384 spin_lock(&cmd->t_state_lock);
6708bb27 2385 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2386 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2387 cmd->se_lun->unpacked_lun,
2388 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2389 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2390 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2391
2392 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2393
6708bb27
AG		 2394 if (!cmd->se_lun) {
2395 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2396 cmd->se_tfo->get_task_tag(cmd),
2397 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2398 BUG();
2399 }
2400 /*
2401 * If the Storage engine still owns the iscsi_cmd_t, determine
2402 * and/or stop its context.
2403 */
6708bb27 2404 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2405 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2406 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2407
e3d6f909 2408 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2409 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2410 continue;
2411 }
2412
6708bb27 2413 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2414 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2415 cmd->se_lun->unpacked_lun,
2416 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2417
a1d8b49a 2418 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2419 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2420 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2421 goto check_cond;
2422 }
7d680f3b 2423 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2424 target_remove_from_state_list(cmd);
a1d8b49a 2425 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2426
c66ac9db
NB		 2427 /*
2428 * The Storage engine stopped this struct se_cmd before it was
2429 * send to the fabric frontend for delivery back to the
2430 * Initiator Node. Return this SCSI CDB back with an
2431 * CHECK_CONDITION status.
2432 */
2433check_cond:
2434 transport_send_check_condition_and_sense(cmd,
2435 TCM_NON_EXISTENT_LUN, 0);
2436 /*
2437 * If the fabric frontend is waiting for this iscsi_cmd_t to
2438 * be released, notify the waiting thread now that LU has
2439 * finished accessing it.
2440 */
a1d8b49a 2441 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2442 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2443 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2444 " struct se_cmd: %p ITT: 0x%08x\n",
2445 lun->unpacked_lun,
e3d6f909 2446 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2447
a1d8b49a 2448 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2449 cmd_flags);
f7113a47 2450 transport_cmd_check_stop(cmd, false);
a1d8b49a 2451 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2452 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2453 continue;
2454 }
6708bb27 2455 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2456 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2457
a1d8b49a 2458 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2459 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2460 }
2461 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2462}
2463
2464static int transport_clear_lun_thread(void *p)
2465{
8359cf43 2466 struct se_lun *lun = p;
c66ac9db
NB		 2467
2468 __transport_clear_lun_from_sessions(lun);
2469 complete(&lun->lun_shutdown_comp);
2470
2471 return 0;
2472}
2473
2474int transport_clear_lun_from_sessions(struct se_lun *lun)
2475{
2476 struct task_struct *kt;
2477
5951146d 2478 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2479 "tcm_cl_%u", lun->unpacked_lun);
2480 if (IS_ERR(kt)) {
6708bb27 2481 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2482 return PTR_ERR(kt);
c66ac9db
NB		 2483 }
2484 wait_for_completion(&lun->lun_shutdown_comp);
2485
2486 return 0;
2487}
2488
d14921d6
NB		 2489/**
2490 * transport_wait_for_tasks - wait for completion to occur
2491 * @cmd: command to wait
c66ac9db 2492 *
d14921d6
NB		 2493 * Called from frontend fabric context to wait for storage engine
2494 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2495 */
a17f091d 2496bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2497{
2498 unsigned long flags;
2499
a1d8b49a 2500 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2501 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2502 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2503 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2504 return false;
d14921d6 2505 }
cb4f4d3c 2506
c8e31f26
AG		 2507 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2508 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2509 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2510 return false;
d14921d6 2511 }
c66ac9db
NB		 2512 /*
2513 * If we are already stopped due to an external event (ie: LUN shutdown)
2514 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2515 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2516 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2517 * has completed its operation on the struct se_cmd.
2518 */
7d680f3b 2519 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2520 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2521 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2522 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2523 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2524 /*
2525 * There is a special case for WRITES where a FE exception +
2526 * LUN shutdown means ConfigFS context is still sleeping on
2527 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2528 * We go ahead and up transport_lun_stop_comp just to be sure
2529 * here.
2530 */
a1d8b49a
AG		 2531 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2532 complete(&cmd->transport_lun_stop_comp);
2533 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2534 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2535
cf572a96 2536 target_remove_from_state_list(cmd);
c66ac9db
NB		 2537 /*
2538 * At this point, the frontend who was the originator of this
2539 * struct se_cmd, now owns the structure and can be released through
2540 * normal means below.
2541 */
6708bb27 2542 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2543 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2544 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2545 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2546
7d680f3b 2547 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2548 }
7d680f3b 2549
3d28934a 2550 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2551 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2552 return false;
d14921d6 2553 }
c66ac9db 2554
7d680f3b 2555 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2556
6708bb27 2557 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2558 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2559 cmd, cmd->se_tfo->get_task_tag(cmd),
2560 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2561
a1d8b49a 2562 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2563
a1d8b49a 2564 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2565
a1d8b49a 2566 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2567 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2568
35d1efe8 2569 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2570 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2571 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2572
d14921d6 2573 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2574
2575 return true;
c66ac9db 2576}
d14921d6 2577EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2578
2579static int transport_get_sense_codes(
2580 struct se_cmd *cmd,
2581 u8 *asc,
2582 u8 *ascq)
2583{
2584 *asc = cmd->scsi_asc;
2585 *ascq = cmd->scsi_ascq;
2586
2587 return 0;
2588}
2589
de103c93
CH		 2590int
2591transport_send_check_condition_and_sense(struct se_cmd *cmd,
2592 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2593{
2594 unsigned char *buffer = cmd->sense_buffer;
2595 unsigned long flags;
c66ac9db
NB		 2596 u8 asc = 0, ascq = 0;
2597
a1d8b49a 2598 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2599 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2600 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2601 return 0;
2602 }
2603 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2604 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2605
2606 if (!reason && from_transport)
2607 goto after_reason;
2608
2609 if (!from_transport)
2610 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2611
c66ac9db
NB		 2612 /*
2613 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2614 * SENSE KEY values from include/scsi/scsi.h
2615 */
2616 switch (reason) {
ba829137
HR		 2617 case TCM_NO_SENSE:
2618 /* CURRENT ERROR */
2619 buffer[0] = 0x70;
2620 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2621 /* Not Ready */
2622 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2623 /* NO ADDITIONAL SENSE INFORMATION */
2624 buffer[SPC_ASC_KEY_OFFSET] = 0;
2625 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2626 break;
c66ac9db 2627 case TCM_NON_EXISTENT_LUN:
eb39d340 2628 /* CURRENT ERROR */
9c58b7dd
RD		 2629 buffer[0] = 0x70;
2630 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2631 /* ILLEGAL REQUEST */
9c58b7dd 2632 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2633 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2634 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2635 break;
c66ac9db
NB		 2636 case TCM_UNSUPPORTED_SCSI_OPCODE:
2637 case TCM_SECTOR_COUNT_TOO_MANY:
2638 /* CURRENT ERROR */
9c58b7dd
RD		 2639 buffer[0] = 0x70;
2640 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2641 /* ILLEGAL REQUEST */
9c58b7dd 2642 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2643 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2644 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2645 break;
2646 case TCM_UNKNOWN_MODE_PAGE:
2647 /* CURRENT ERROR */
9c58b7dd
RD		 2648 buffer[0] = 0x70;
2649 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2650 /* ILLEGAL REQUEST */
9c58b7dd 2651 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2652 /* INVALID FIELD IN CDB */
9c58b7dd 2653 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2654 break;
2655 case TCM_CHECK_CONDITION_ABORT_CMD:
2656 /* CURRENT ERROR */
9c58b7dd
RD		 2657 buffer[0] = 0x70;
2658 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2659 /* ABORTED COMMAND */
9c58b7dd 2660 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2661 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2662 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2663 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2664 break;
2665 case TCM_INCORRECT_AMOUNT_OF_DATA:
2666 /* CURRENT ERROR */
9c58b7dd
RD		 2667 buffer[0] = 0x70;
2668 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2669 /* ABORTED COMMAND */
9c58b7dd 2670 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2671 /* WRITE ERROR */
9c58b7dd 2672 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2673 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2674 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2675 break;
2676 case TCM_INVALID_CDB_FIELD:
2677 /* CURRENT ERROR */
9c58b7dd
RD		 2678 buffer[0] = 0x70;
2679 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2680 /* ILLEGAL REQUEST */
9c58b7dd 2681 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2682 /* INVALID FIELD IN CDB */
9c58b7dd 2683 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2684 break;
2685 case TCM_INVALID_PARAMETER_LIST:
2686 /* CURRENT ERROR */
9c58b7dd
RD		 2687 buffer[0] = 0x70;
2688 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2689 /* ILLEGAL REQUEST */
9c58b7dd 2690 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2691 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2692 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2693 break;
bb992e72
RD		 2694 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2695 /* CURRENT ERROR */
2696 buffer[0] = 0x70;
2697 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2698 /* ILLEGAL REQUEST */
2699 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2700 /* PARAMETER LIST LENGTH ERROR */
2701 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2702 break;
c66ac9db
NB		 2703 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2704 /* CURRENT ERROR */
9c58b7dd
RD		 2705 buffer[0] = 0x70;
2706 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2707 /* ABORTED COMMAND */
9c58b7dd 2708 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2709 /* WRITE ERROR */
9c58b7dd 2710 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2711 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2712 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2713 break;
2714 case TCM_SERVICE_CRC_ERROR:
2715 /* CURRENT ERROR */
9c58b7dd
RD		 2716 buffer[0] = 0x70;
2717 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2718 /* ABORTED COMMAND */
9c58b7dd 2719 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2720 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2721 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2722 /* N/A */
9c58b7dd 2723 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2724 break;
2725 case TCM_SNACK_REJECTED:
2726 /* CURRENT ERROR */
9c58b7dd
RD		 2727 buffer[0] = 0x70;
2728 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2729 /* ABORTED COMMAND */
9c58b7dd 2730 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2731 /* READ ERROR */
9c58b7dd 2732 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2733 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2734 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2735 break;
2736 case TCM_WRITE_PROTECTED:
2737 /* CURRENT ERROR */
9c58b7dd
RD		 2738 buffer[0] = 0x70;
2739 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2740 /* DATA PROTECT */
9c58b7dd 2741 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2742 /* WRITE PROTECTED */
9c58b7dd 2743 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2744 break;
e2397c70
RD		 2745 case TCM_ADDRESS_OUT_OF_RANGE:
2746 /* CURRENT ERROR */
9c58b7dd
RD		 2747 buffer[0] = 0x70;
2748 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2749 /* ILLEGAL REQUEST */
9c58b7dd 2750 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2751 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2752 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2753 break;
c66ac9db
NB		 2754 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2755 /* CURRENT ERROR */
9c58b7dd
RD		 2756 buffer[0] = 0x70;
2757 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2758 /* UNIT ATTENTION */
9c58b7dd 2759 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2760 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2761 buffer[SPC_ASC_KEY_OFFSET] = asc;
2762 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2763 break;
2764 case TCM_CHECK_CONDITION_NOT_READY:
2765 /* CURRENT ERROR */
9c58b7dd
RD		 2766 buffer[0] = 0x70;
2767 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2768 /* Not Ready */
9c58b7dd 2769 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2770 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2771 buffer[SPC_ASC_KEY_OFFSET] = asc;
2772 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2773 break;
2774 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2775 default:
2776 /* CURRENT ERROR */
9c58b7dd
RD		 2777 buffer[0] = 0x70;
2778 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2779 /*
2780 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2781 * Solaris initiators. Returning NOT READY instead means the
2782 * operations will be retried a finite number of times and we
2783 * can survive intermittent errors.
2784 */
2785 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2786 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2787 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2788 break;
2789 }
2790 /*
2791 * This code uses linux/include/scsi/scsi.h SAM status codes!
2792 */
2793 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2794 /*
2795 * Automatically padded, this value is encoded in the fabric's
2796 * data_length response PDU containing the SCSI defined sense data.
2797 */
9c58b7dd 2798 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2799
2800after_reason:
07bde79a 2801 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2802}
2803EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2804
2805int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2806{
c18bc7d8
RD		 2807 if (!(cmd->transport_state & CMD_T_ABORTED))
2808 return 0;
c66ac9db 2809
c18bc7d8
RD		 2810 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2811 return 1;
8b1e1244 2812
c18bc7d8
RD		 2813 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2814 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2815
c18bc7d8
RD		 2816 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
2817 cmd->se_tfo->queue_status(cmd);
2818
2819 return 1;
c66ac9db
NB		 2820}
2821EXPORT_SYMBOL(transport_check_aborted_status);
2822
2823void transport_send_task_abort(struct se_cmd *cmd)
2824{
c252f003
NB		 2825 unsigned long flags;
2826
2827 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2828 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2829 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2830 return;
2831 }
2832 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2833
c66ac9db
NB		 2834 /*
2835 * If there are still expected incoming fabric WRITEs, we wait
2836 * until until they have completed before sending a TASK_ABORTED
2837 * response. This response with TASK_ABORTED status will be
2838 * queued back to fabric module by transport_check_aborted_status().
2839 */
2840 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2841 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2842 cmd->transport_state |= CMD_T_ABORTED;
b81f3e0c 2843 smp_mb__after_atomic();
c66ac9db
NB		 2844 }
2845 }
2846 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2847
72b59d6e
RD		 2848 transport_lun_remove_cmd(cmd);
2849
6708bb27 2850 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2851 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2852 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2853
e3d6f909 2854 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2855}
2856
af877292 2857static void target_tmr_work(struct work_struct *work)
c66ac9db 2858{
af877292 2859 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2860 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2861 struct se_tmr_req *tmr = cmd->se_tmr_req;
2862 int ret;
2863
2864 switch (tmr->function) {
5c6cd613 2865 case TMR_ABORT_TASK:
3d28934a 2866 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2867 break;
5c6cd613
NB		 2868 case TMR_ABORT_TASK_SET:
2869 case TMR_CLEAR_ACA:
2870 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2871 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2872 break;
5c6cd613 2873 case TMR_LUN_RESET:
c66ac9db
NB		 2874 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2875 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2876 TMR_FUNCTION_REJECTED;
2877 break;
5c6cd613 2878 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2879 tmr->response = TMR_FUNCTION_REJECTED;
2880 break;
5c6cd613 2881 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2882 tmr->response = TMR_FUNCTION_REJECTED;
2883 break;
c66ac9db 2884 default:
6708bb27 2885 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2886 tmr->function);
2887 tmr->response = TMR_FUNCTION_REJECTED;
2888 break;
2889 }
2890
2891 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2892 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2893
b7b8bef7 2894 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2895}
2896
af877292
CH		 2897int transport_generic_handle_tmr(
2898 struct se_cmd *cmd)
c66ac9db 2899{
7f2a9059
NB		 2900 unsigned long flags;
2901
2902 spin_lock_irqsave(&cmd->t_state_lock, flags);
2903 cmd->transport_state |= CMD_T_ACTIVE;
2904 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2905
af877292
CH		 2906 INIT_WORK(&cmd->work, target_tmr_work);
2907 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2908 return 0;
2909}
af877292 2910EXPORT_SYMBOL(transport_generic_handle_tmr);