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iscsi-target: Avoid unnecessary t_state_lock during unsolicited data-out check
[deliverable/linux.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
862e6389
NB		 449static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
450 bool write_pending)
c66ac9db
NB		 451{
452 unsigned long flags;
453
a1d8b49a 454 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 455 if (write_pending)
456 cmd->t_state = TRANSPORT_WRITE_PENDING;
457
c66ac9db
NB		 458 /*
459 * Determine if IOCTL context caller in requesting the stopping of this
460 * command for LUN shutdown purposes.
461 */
7d680f3b
CH		 462 if (cmd->transport_state & CMD_T_LUN_STOP) {
463 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
464 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 465
7d680f3b 466 cmd->transport_state &= ~CMD_T_ACTIVE;
f7113a47 467 if (remove_from_lists)
cf572a96 468 target_remove_from_state_list(cmd);
a1d8b49a 469 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 470
a1d8b49a 471 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 472 return 1;
473 }
f7113a47
CH		 474
475 if (remove_from_lists) {
476 target_remove_from_state_list(cmd);
477
478 /*
479 * Clear struct se_cmd->se_lun before the handoff to FE.
480 */
481 cmd->se_lun = NULL;
482 }
483
c66ac9db
NB		 484 /*
485 * Determine if frontend context caller is requesting the stopping of
e3d6f909 486 * this command for frontend exceptions.
c66ac9db 487 */
7d680f3b
CH		 488 if (cmd->transport_state & CMD_T_STOP) {
489 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
490 __func__, __LINE__,
e3d6f909 491 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 492
a1d8b49a 493 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 494
a1d8b49a 495 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 496 return 1;
497 }
f7113a47
CH		 498
499 cmd->transport_state &= ~CMD_T_ACTIVE;
500 if (remove_from_lists) {
501 /*
502 * Some fabric modules like tcm_loop can release
503 * their internally allocated I/O reference now and
504 * struct se_cmd now.
505 *
506 * Fabric modules are expected to return '1' here if the
507 * se_cmd being passed is released at this point,
508 * or zero if not being released.
509 */
510 if (cmd->se_tfo->check_stop_free != NULL) {
511 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
512 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 513 }
f7113a47 514 }
c66ac9db 515
a1d8b49a 516 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 517 return 0;
518}
519
520static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
521{
862e6389 522 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 523}
524
525static void transport_lun_remove_cmd(struct se_cmd *cmd)
526{
e3d6f909 527 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 528 unsigned long flags;
529
530 if (!lun)
531 return;
532
c66ac9db 533 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 534 if (!list_empty(&cmd->se_lun_node))
535 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 536 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
537}
538
539void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
540{
c66ac9db
NB		 541 if (transport_cmd_check_stop_to_fabric(cmd))
542 return;
af877292 543 if (remove)
e6a2573f 544 transport_put_cmd(cmd);
c66ac9db
NB		 545}
546
35e0e757
CH		 547static void target_complete_failure_work(struct work_struct *work)
548{
549 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
550
de103c93
CH		 551 transport_generic_request_failure(cmd,
552 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 553}
554
6138ed2a 555/*
d5829eac
PB		 556 * Used when asking transport to copy Sense Data from the underlying
557 * Linux/SCSI struct scsi_cmnd
6138ed2a 558 */
d5829eac 559static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 560{
6138ed2a 561 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 562
563 WARN_ON(!cmd->se_lun);
564
565 if (!dev)
d5829eac 566 return NULL;
6138ed2a 567
d5829eac
PB		 568 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
569 return NULL;
6138ed2a 570
9c58b7dd 571 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 572
d5829eac 573 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 574 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 575 return cmd->sense_buffer;
6138ed2a
PB		 576}
577
5787cacd 578void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 579{
42bf829e 580 struct se_device *dev = cmd->se_dev;
5787cacd 581 int success = scsi_status == GOOD;
c66ac9db 582 unsigned long flags;
c66ac9db 583
5787cacd
CH		 584 cmd->scsi_status = scsi_status;
585
586
a1d8b49a 587 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 588 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 589
c66ac9db 590 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 591 dev->transport->transport_complete(cmd,
592 cmd->t_data_sg,
593 transport_get_sense_buffer(cmd));
594 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 595 success = 1;
c66ac9db
NB		 596 }
597
598 /*
5787cacd 599 * See if we are waiting to complete for an exception condition.
c66ac9db 600 */
cf572a96 601 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 602 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 603 complete(&cmd->task_stop_comp);
c66ac9db
NB		 604 return;
605 }
2235007c
CH		 606
607 if (!success)
7d680f3b 608 cmd->transport_state |= CMD_T_FAILED;
2235007c 609
3d28934a
NB		 610 /*
611 * Check for case where an explict ABORT_TASK has been received
612 * and transport_wait_for_tasks() will be waiting for completion..
613 */
614 if (cmd->transport_state & CMD_T_ABORTED &&
615 cmd->transport_state & CMD_T_STOP) {
616 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
617 complete(&cmd->t_transport_stop_comp);
618 return;
619 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 620 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 621 } else {
35e0e757 622 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 623 }
35e0e757 624
35e0e757 625 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 626 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 627 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 628
35e0e757 629 queue_work(target_completion_wq, &cmd->work);
c66ac9db 630}
6bb35e00
CH		 631EXPORT_SYMBOL(target_complete_cmd);
632
cf572a96 633static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 634{
cf572a96
CH		 635 struct se_device *dev = cmd->se_dev;
636 unsigned long flags;
c66ac9db 637
cf572a96
CH		 638 spin_lock_irqsave(&dev->execute_task_lock, flags);
639 if (!cmd->state_active) {
640 list_add_tail(&cmd->state_list, &dev->state_list);
641 cmd->state_active = true;
c66ac9db 642 }
cf572a96 643 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 644}
645
07bde79a 646/*
f147abb4 647 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 648 */
7a6f0a1e
CH		 649static void transport_write_pending_qf(struct se_cmd *cmd);
650static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 651
0fd97ccf 652void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 653{
654 struct se_device *dev = container_of(work, struct se_device,
655 qf_work_queue);
bcac364a 656 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 657 struct se_cmd *cmd, *cmd_tmp;
658
659 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 660 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
661 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 662
bcac364a 663 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 664 list_del(&cmd->se_qf_node);
665 atomic_dec(&dev->dev_qf_count);
666 smp_mb__after_atomic_dec();
07bde79a 667
6708bb27 668 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 669 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 670 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 671 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
672 : "UNKNOWN");
f7a5cc0b 673
7a6f0a1e
CH		 674 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
675 transport_write_pending_qf(cmd);
676 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
677 transport_complete_qf(cmd);
07bde79a 678 }
07bde79a
NB		 679}
680
c66ac9db
NB		 681unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
682{
683 switch (cmd->data_direction) {
684 case DMA_NONE:
685 return "NONE";
686 case DMA_FROM_DEVICE:
687 return "READ";
688 case DMA_TO_DEVICE:
689 return "WRITE";
690 case DMA_BIDIRECTIONAL:
691 return "BIDI";
692 default:
693 break;
694 }
695
696 return "UNKNOWN";
697}
698
699void transport_dump_dev_state(
700 struct se_device *dev,
701 char *b,
702 int *bl)
703{
704 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 705 if (dev->export_count)
c66ac9db 706 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 707 else
c66ac9db 708 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 709
5f41a31d 710 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 711 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 712 dev->dev_attrib.block_size,
713 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 714 *bl += sprintf(b + *bl, " ");
715}
716
c66ac9db
NB		 717void transport_dump_vpd_proto_id(
718 struct t10_vpd *vpd,
719 unsigned char *p_buf,
720 int p_buf_len)
721{
722 unsigned char buf[VPD_TMP_BUF_SIZE];
723 int len;
724
725 memset(buf, 0, VPD_TMP_BUF_SIZE);
726 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
727
728 switch (vpd->protocol_identifier) {
729 case 0x00:
730 sprintf(buf+len, "Fibre Channel\n");
731 break;
732 case 0x10:
733 sprintf(buf+len, "Parallel SCSI\n");
734 break;
735 case 0x20:
736 sprintf(buf+len, "SSA\n");
737 break;
738 case 0x30:
739 sprintf(buf+len, "IEEE 1394\n");
740 break;
741 case 0x40:
742 sprintf(buf+len, "SCSI Remote Direct Memory Access"
743 " Protocol\n");
744 break;
745 case 0x50:
746 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
747 break;
748 case 0x60:
749 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
750 break;
751 case 0x70:
752 sprintf(buf+len, "Automation/Drive Interface Transport"
753 " Protocol\n");
754 break;
755 case 0x80:
756 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
757 break;
758 default:
759 sprintf(buf+len, "Unknown 0x%02x\n",
760 vpd->protocol_identifier);
761 break;
762 }
763
764 if (p_buf)
765 strncpy(p_buf, buf, p_buf_len);
766 else
6708bb27 767 pr_debug("%s", buf);
c66ac9db
NB		 768}
769
770void
771transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
772{
773 /*
774 * Check if the Protocol Identifier Valid (PIV) bit is set..
775 *
776 * from spc3r23.pdf section 7.5.1
777 */
778 if (page_83[1] & 0x80) {
779 vpd->protocol_identifier = (page_83[0] & 0xf0);
780 vpd->protocol_identifier_set = 1;
781 transport_dump_vpd_proto_id(vpd, NULL, 0);
782 }
783}
784EXPORT_SYMBOL(transport_set_vpd_proto_id);
785
786int transport_dump_vpd_assoc(
787 struct t10_vpd *vpd,
788 unsigned char *p_buf,
789 int p_buf_len)
790{
791 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 792 int ret = 0;
793 int len;
c66ac9db
NB		 794
795 memset(buf, 0, VPD_TMP_BUF_SIZE);
796 len = sprintf(buf, "T10 VPD Identifier Association: ");
797
798 switch (vpd->association) {
799 case 0x00:
800 sprintf(buf+len, "addressed logical unit\n");
801 break;
802 case 0x10:
803 sprintf(buf+len, "target port\n");
804 break;
805 case 0x20:
806 sprintf(buf+len, "SCSI target device\n");
807 break;
808 default:
809 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 810 ret = -EINVAL;
c66ac9db
NB		 811 break;
812 }
813
814 if (p_buf)
815 strncpy(p_buf, buf, p_buf_len);
816 else
6708bb27 817 pr_debug("%s", buf);
c66ac9db
NB		 818
819 return ret;
820}
821
822int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
823{
824 /*
825 * The VPD identification association..
826 *
827 * from spc3r23.pdf Section 7.6.3.1 Table 297
828 */
829 vpd->association = (page_83[1] & 0x30);
830 return transport_dump_vpd_assoc(vpd, NULL, 0);
831}
832EXPORT_SYMBOL(transport_set_vpd_assoc);
833
834int transport_dump_vpd_ident_type(
835 struct t10_vpd *vpd,
836 unsigned char *p_buf,
837 int p_buf_len)
838{
839 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 840 int ret = 0;
841 int len;
c66ac9db
NB		 842
843 memset(buf, 0, VPD_TMP_BUF_SIZE);
844 len = sprintf(buf, "T10 VPD Identifier Type: ");
845
846 switch (vpd->device_identifier_type) {
847 case 0x00:
848 sprintf(buf+len, "Vendor specific\n");
849 break;
850 case 0x01:
851 sprintf(buf+len, "T10 Vendor ID based\n");
852 break;
853 case 0x02:
854 sprintf(buf+len, "EUI-64 based\n");
855 break;
856 case 0x03:
857 sprintf(buf+len, "NAA\n");
858 break;
859 case 0x04:
860 sprintf(buf+len, "Relative target port identifier\n");
861 break;
862 case 0x08:
863 sprintf(buf+len, "SCSI name string\n");
864 break;
865 default:
866 sprintf(buf+len, "Unsupported: 0x%02x\n",
867 vpd->device_identifier_type);
e3d6f909 868 ret = -EINVAL;
c66ac9db
NB		 869 break;
870 }
871
e3d6f909
AG		 872 if (p_buf) {
873 if (p_buf_len < strlen(buf)+1)
874 return -EINVAL;
c66ac9db 875 strncpy(p_buf, buf, p_buf_len);
e3d6f909 876 } else {
6708bb27 877 pr_debug("%s", buf);
e3d6f909 878 }
c66ac9db
NB		 879
880 return ret;
881}
882
883int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
884{
885 /*
886 * The VPD identifier type..
887 *
888 * from spc3r23.pdf Section 7.6.3.1 Table 298
889 */
890 vpd->device_identifier_type = (page_83[1] & 0x0f);
891 return transport_dump_vpd_ident_type(vpd, NULL, 0);
892}
893EXPORT_SYMBOL(transport_set_vpd_ident_type);
894
895int transport_dump_vpd_ident(
896 struct t10_vpd *vpd,
897 unsigned char *p_buf,
898 int p_buf_len)
899{
900 unsigned char buf[VPD_TMP_BUF_SIZE];
901 int ret = 0;
902
903 memset(buf, 0, VPD_TMP_BUF_SIZE);
904
905 switch (vpd->device_identifier_code_set) {
906 case 0x01: /* Binary */
703d641d
DC		 907 snprintf(buf, sizeof(buf),
908 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 909 &vpd->device_identifier[0]);
910 break;
911 case 0x02: /* ASCII */
703d641d
DC		 912 snprintf(buf, sizeof(buf),
913 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 914 &vpd->device_identifier[0]);
915 break;
916 case 0x03: /* UTF-8 */
703d641d
DC		 917 snprintf(buf, sizeof(buf),
918 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 919 &vpd->device_identifier[0]);
920 break;
921 default:
922 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
923 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 924 ret = -EINVAL;
c66ac9db
NB		 925 break;
926 }
927
928 if (p_buf)
929 strncpy(p_buf, buf, p_buf_len);
930 else
6708bb27 931 pr_debug("%s", buf);
c66ac9db
NB		 932
933 return ret;
934}
935
936int
937transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
938{
939 static const char hex_str[] = "0123456789abcdef";
35d1efe8 940 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 941
942 /*
943 * The VPD Code Set (encoding)
944 *
945 * from spc3r23.pdf Section 7.6.3.1 Table 296
946 */
947 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
948 switch (vpd->device_identifier_code_set) {
949 case 0x01: /* Binary */
950 vpd->device_identifier[j++] =
951 hex_str[vpd->device_identifier_type];
952 while (i < (4 + page_83[3])) {
953 vpd->device_identifier[j++] =
954 hex_str[(page_83[i] & 0xf0) >> 4];
955 vpd->device_identifier[j++] =
956 hex_str[page_83[i] & 0x0f];
957 i++;
958 }
959 break;
960 case 0x02: /* ASCII */
961 case 0x03: /* UTF-8 */
962 while (i < (4 + page_83[3]))
963 vpd->device_identifier[j++] = page_83[i++];
964 break;
965 default:
966 break;
967 }
968
969 return transport_dump_vpd_ident(vpd, NULL, 0);
970}
971EXPORT_SYMBOL(transport_set_vpd_ident);
972
de103c93
CH		 973sense_reason_t
974target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 975{
976 struct se_device *dev = cmd->se_dev;
977
978 if (cmd->unknown_data_length) {
979 cmd->data_length = size;
980 } else if (size != cmd->data_length) {
981 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
982 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
983 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
984 cmd->data_length, size, cmd->t_task_cdb[0]);
985
9b3b8041
CH		 986 if (cmd->data_direction == DMA_TO_DEVICE) {
987 pr_err("Rejecting underflow/overflow"
988 " WRITE data\n");
de103c93 989 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 990 }
991 /*
992 * Reject READ_* or WRITE_* with overflow/underflow for
993 * type SCF_SCSI_DATA_CDB.
994 */
0fd97ccf 995 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 996 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
997 " CDB on non 512-byte sector setup subsystem"
998 " plugin: %s\n", dev->transport->name);
999 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1000 return TCM_INVALID_CDB_FIELD;
9b3b8041 1001 }
4c054ba6
NB		 1002 /*
1003 * For the overflow case keep the existing fabric provided
1004 * ->data_length. Otherwise for the underflow case, reset
1005 * ->data_length to the smaller SCSI expected data transfer
1006 * length.
1007 */
9b3b8041
CH		 1008 if (size > cmd->data_length) {
1009 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1010 cmd->residual_count = (size - cmd->data_length);
1011 } else {
1012 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1013 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1014 cmd->data_length = size;
9b3b8041 1015 }
9b3b8041
CH		 1016 }
1017
1018 return 0;
1019
9b3b8041
CH		 1020}
1021
c66ac9db
NB		 1022/*
1023 * Used by fabric modules containing a local struct se_cmd within their
1024 * fabric dependent per I/O descriptor.
1025 */
1026void transport_init_se_cmd(
1027 struct se_cmd *cmd,
1028 struct target_core_fabric_ops *tfo,
1029 struct se_session *se_sess,
1030 u32 data_length,
1031 int data_direction,
1032 int task_attr,
1033 unsigned char *sense_buffer)
1034{
5951146d
AG		 1035 INIT_LIST_HEAD(&cmd->se_lun_node);
1036 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1037 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1038 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1039 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1040 init_completion(&cmd->transport_lun_fe_stop_comp);
1041 init_completion(&cmd->transport_lun_stop_comp);
1042 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1043 init_completion(&cmd->cmd_wait_comp);
cf572a96 1044 init_completion(&cmd->task_stop_comp);
a1d8b49a 1045 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1046 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1047
1048 cmd->se_tfo = tfo;
1049 cmd->se_sess = se_sess;
1050 cmd->data_length = data_length;
1051 cmd->data_direction = data_direction;
1052 cmd->sam_task_attr = task_attr;
1053 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1054
1055 cmd->state_active = false;
c66ac9db
NB		 1056}
1057EXPORT_SYMBOL(transport_init_se_cmd);
1058
de103c93
CH		 1059static sense_reason_t
1060transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1061{
019c4ca6
CH		 1062 struct se_device *dev = cmd->se_dev;
1063
c66ac9db
NB		 1064 /*
1065 * Check if SAM Task Attribute emulation is enabled for this
1066 * struct se_device storage object
1067 */
019c4ca6 1068 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1069 return 0;
1070
e66ecd50 1071 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1072 pr_debug("SAM Task Attribute ACA"
c66ac9db 1073 " emulation is not supported\n");
de103c93 1074 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1075 }
1076 /*
1077 * Used to determine when ORDERED commands should go from
1078 * Dormant to Active status.
1079 */
019c4ca6 1080 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1081 smp_mb__after_atomic_inc();
6708bb27 1082 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1083 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1084 dev->transport->name);
c66ac9db
NB		 1085 return 0;
1086}
1087
de103c93
CH		 1088sense_reason_t
1089target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1090{
0fd97ccf 1091 struct se_device *dev = cmd->se_dev;
de103c93 1092 sense_reason_t ret;
c66ac9db 1093
c66ac9db
NB		 1094 /*
1095 * Ensure that the received CDB is less than the max (252 + 8) bytes
1096 * for VARIABLE_LENGTH_CMD
1097 */
1098 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1099 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1100 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1101 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1102 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1103 }
1104 /*
1105 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1106 * allocate the additional extended CDB buffer now.. Otherwise
1107 * setup the pointer from __t_task_cdb to t_task_cdb.
1108 */
a1d8b49a
AG		 1109 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1110 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1111 GFP_KERNEL);
6708bb27
AG		 1112 if (!cmd->t_task_cdb) {
1113 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1114 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1115 scsi_command_size(cdb),
a1d8b49a 1116 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1117 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1118 }
1119 } else
a1d8b49a 1120 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1121 /*
a1d8b49a 1122 * Copy the original CDB into cmd->
c66ac9db 1123 */
a1d8b49a 1124 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1125
1126 /*
1127 * Check for an existing UNIT ATTENTION condition
1128 */
de103c93
CH		 1129 ret = target_scsi3_ua_check(cmd);
1130 if (ret)
1131 return ret;
cb4f4d3c 1132
c87fbd56 1133 ret = target_alua_state_check(cmd);
de103c93
CH		 1134 if (ret)
1135 return ret;
cb4f4d3c 1136
d977f437 1137 ret = target_check_reservation(cmd);
f85eda8d
NB		 1138 if (ret) {
1139 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1140 return ret;
f85eda8d 1141 }
cb4f4d3c 1142
0fd97ccf 1143 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1144 if (ret)
1145 return ret;
1146
1147 ret = transport_check_alloc_task_attr(cmd);
1148 if (ret)
c66ac9db 1149 return ret;
cb4f4d3c 1150
cb4f4d3c 1151 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1152
c66ac9db
NB		 1153 spin_lock(&cmd->se_lun->lun_sep_lock);
1154 if (cmd->se_lun->lun_sep)
1155 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1156 spin_unlock(&cmd->se_lun->lun_sep_lock);
1157 return 0;
1158}
a12f41f8 1159EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1160
695434e1
NB		 1161/*
1162 * Used by fabric module frontends to queue tasks directly.
1163 * Many only be used from process context only
1164 */
1165int transport_handle_cdb_direct(
1166 struct se_cmd *cmd)
1167{
de103c93 1168 sense_reason_t ret;
dd8ae59d 1169
695434e1
NB		 1170 if (!cmd->se_lun) {
1171 dump_stack();
6708bb27 1172 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1173 return -EINVAL;
1174 }
1175 if (in_interrupt()) {
1176 dump_stack();
6708bb27 1177 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1178 " from interrupt context\n");
1179 return -EINVAL;
1180 }
dd8ae59d 1181 /*
af877292
CH		 1182 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1183 * outstanding descriptors are handled correctly during shutdown via
1184 * transport_wait_for_tasks()
dd8ae59d
NB		 1185 *
1186 * Also, we don't take cmd->t_state_lock here as we only expect
1187 * this to be called for initial descriptor submission.
1188 */
1189 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1190 cmd->transport_state |= CMD_T_ACTIVE;
1191
dd8ae59d
NB		 1192 /*
1193 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1194 * so follow TRANSPORT_NEW_CMD processing thread context usage
1195 * and call transport_generic_request_failure() if necessary..
1196 */
1197 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1198 if (ret)
1199 transport_generic_request_failure(cmd, ret);
dd8ae59d 1200 return 0;
695434e1
NB		 1201}
1202EXPORT_SYMBOL(transport_handle_cdb_direct);
1203
de103c93
CH		 1204static sense_reason_t
1205transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1206 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1207{
1208 if (!sgl || !sgl_count)
1209 return 0;
1210
1211 /*
1212 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1213 * scatterlists already have been set to follow what the fabric
1214 * passes for the original expected data transfer length.
1215 */
1216 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1217 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1218 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1219 return TCM_INVALID_CDB_FIELD;
1220 }
1221
1222 cmd->t_data_sg = sgl;
1223 cmd->t_data_nents = sgl_count;
1224
1225 if (sgl_bidi && sgl_bidi_count) {
1226 cmd->t_bidi_data_sg = sgl_bidi;
1227 cmd->t_bidi_data_nents = sgl_bidi_count;
1228 }
1229 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1230 return 0;
1231}
1232
a026757f
NB		 1233/*
1234 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1235 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1236 *
1237 * @se_cmd: command descriptor to submit
1238 * @se_sess: associated se_sess for endpoint
1239 * @cdb: pointer to SCSI CDB
1240 * @sense: pointer to SCSI sense buffer
1241 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1242 * @data_length: fabric expected data transfer length
1243 * @task_addr: SAM task attribute
1244 * @data_dir: DMA data direction
1245 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1246 * @sgl: struct scatterlist memory for unidirectional mapping
1247 * @sgl_count: scatterlist count for unidirectional mapping
1248 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1249 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1250 *
d6dfc868
RD		 1251 * Returns non zero to signal active I/O shutdown failure. All other
1252 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1253 * but still return zero here.
1254 *
a6360785
NB		 1255 * This may only be called from process context, and also currently
1256 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1257 */
1258int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1259 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1260 u32 data_length, int task_attr, int data_dir, int flags,
1261 struct scatterlist *sgl, u32 sgl_count,
1262 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1263{
1264 struct se_portal_group *se_tpg;
de103c93
CH		 1265 sense_reason_t rc;
1266 int ret;
a6360785
NB		 1267
1268 se_tpg = se_sess->se_tpg;
1269 BUG_ON(!se_tpg);
1270 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1271 BUG_ON(in_interrupt());
1272 /*
1273 * Initialize se_cmd for target operation. From this point
1274 * exceptions are handled by sending exception status via
1275 * target_core_fabric_ops->queue_status() callback
1276 */
1277 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1278 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1279 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1280 se_cmd->unknown_data_length = 1;
a6360785
NB		 1281 /*
1282 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1283 * se_sess->sess_cmd_list. A second kref_get here is necessary
1284 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1285 * kref_put() to happen during fabric packet acknowledgement.
1286 */
de103c93
CH		 1287 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1288 if (ret)
1289 return ret;
a6360785
NB		 1290 /*
1291 * Signal bidirectional data payloads to target-core
1292 */
1293 if (flags & TARGET_SCF_BIDI_OP)
1294 se_cmd->se_cmd_flags |= SCF_BIDI;
1295 /*
1296 * Locate se_lun pointer and attach it to struct se_cmd
1297 */
de103c93
CH		 1298 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1299 if (rc) {
1300 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1301 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1302 return 0;
735703ca 1303 }
d6e0175c 1304
a12f41f8 1305 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1306 if (rc != 0) {
de103c93 1307 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1308 return 0;
735703ca 1309 }
a026757f
NB		 1310 /*
1311 * When a non zero sgl_count has been passed perform SGL passthrough
1312 * mapping for pre-allocated fabric memory instead of having target
1313 * core perform an internal SGL allocation..
1314 */
1315 if (sgl_count != 0) {
1316 BUG_ON(!sgl);
1317
944981c7
NB		 1318 /*
1319 * A work-around for tcm_loop as some userspace code via
1320 * scsi-generic do not memset their associated read buffers,
1321 * so go ahead and do that here for type non-data CDBs. Also
1322 * note that this is currently guaranteed to be a single SGL
1323 * for this case by target core in target_setup_cmd_from_cdb()
1324 * -> transport_generic_cmd_sequencer().
1325 */
1326 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1327 se_cmd->data_direction == DMA_FROM_DEVICE) {
1328 unsigned char *buf = NULL;
1329
1330 if (sgl)
1331 buf = kmap(sg_page(sgl)) + sgl->offset;
1332
1333 if (buf) {
1334 memset(buf, 0, sgl->length);
1335 kunmap(sg_page(sgl));
1336 }
1337 }
1338
a026757f
NB		 1339 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1340 sgl_bidi, sgl_bidi_count);
1341 if (rc != 0) {
de103c93 1342 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1343 return 0;
1344 }
1345 }
11e319ed
AG		 1346 /*
1347 * Check if we need to delay processing because of ALUA
1348 * Active/NonOptimized primary access state..
1349 */
1350 core_alua_check_nonop_delay(se_cmd);
1351
a6360785 1352 transport_handle_cdb_direct(se_cmd);
d6dfc868 1353 return 0;
a6360785 1354}
a026757f
NB		 1355EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1356
1357/*
1358 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1359 *
1360 * @se_cmd: command descriptor to submit
1361 * @se_sess: associated se_sess for endpoint
1362 * @cdb: pointer to SCSI CDB
1363 * @sense: pointer to SCSI sense buffer
1364 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1365 * @data_length: fabric expected data transfer length
1366 * @task_addr: SAM task attribute
1367 * @data_dir: DMA data direction
1368 * @flags: flags for command submission from target_sc_flags_tables
1369 *
1370 * Returns non zero to signal active I/O shutdown failure. All other
1371 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1372 * but still return zero here.
1373 *
1374 * This may only be called from process context, and also currently
1375 * assumes internal allocation of fabric payload buffer by target-core.
1376 *
1377 * It also assumes interal target core SGL memory allocation.
1378 */
1379int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1380 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1381 u32 data_length, int task_attr, int data_dir, int flags)
1382{
1383 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1384 unpacked_lun, data_length, task_attr, data_dir,
1385 flags, NULL, 0, NULL, 0);
1386}
a6360785
NB		 1387EXPORT_SYMBOL(target_submit_cmd);
1388
9f0d05c2
NB		 1389static void target_complete_tmr_failure(struct work_struct *work)
1390{
1391 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1392
1393 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1394 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1395
1396 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1397}
1398
ea98d7f9
AG		 1399/**
1400 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1401 * for TMR CDBs
1402 *
1403 * @se_cmd: command descriptor to submit
1404 * @se_sess: associated se_sess for endpoint
1405 * @sense: pointer to SCSI sense buffer
1406 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1407 * @fabric_context: fabric context for TMR req
1408 * @tm_type: Type of TM request
c0974f89
NB		 1409 * @gfp: gfp type for caller
1410 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1411 * @flags: submit cmd flags
ea98d7f9
AG		 1412 *
1413 * Callable from all contexts.
1414 **/
1415
c7042cae 1416int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1417 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1418 void *fabric_tmr_ptr, unsigned char tm_type,
1419 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1420{
1421 struct se_portal_group *se_tpg;
1422 int ret;
1423
1424 se_tpg = se_sess->se_tpg;
1425 BUG_ON(!se_tpg);
1426
1427 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1428 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1429 /*
1430 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1431 * allocation failure.
1432 */
c0974f89 1433 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1434 if (ret < 0)
1435 return -ENOMEM;
ea98d7f9 1436
c0974f89
NB		 1437 if (tm_type == TMR_ABORT_TASK)
1438 se_cmd->se_tmr_req->ref_task_tag = tag;
1439
ea98d7f9 1440 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1441 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1442 if (ret) {
1443 core_tmr_release_req(se_cmd->se_tmr_req);
1444 return ret;
1445 }
ea98d7f9 1446
ea98d7f9
AG		 1447 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1448 if (ret) {
9f0d05c2
NB		 1449 /*
1450 * For callback during failure handling, push this work off
1451 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1452 */
1453 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1454 schedule_work(&se_cmd->work);
c7042cae 1455 return 0;
ea98d7f9
AG		 1456 }
1457 transport_generic_handle_tmr(se_cmd);
c7042cae 1458 return 0;
ea98d7f9
AG		 1459}
1460EXPORT_SYMBOL(target_submit_tmr);
1461
cdbb70bb 1462/*
cf572a96 1463 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1464 * has completed.
1465 */
cf572a96 1466bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1467{
cdbb70bb
CH		 1468 bool was_active = false;
1469
cf572a96
CH		 1470 if (cmd->transport_state & CMD_T_BUSY) {
1471 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1472 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1473
cf572a96
CH		 1474 pr_debug("cmd %p waiting to complete\n", cmd);
1475 wait_for_completion(&cmd->task_stop_comp);
1476 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1477
1478 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1479 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1480 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1481 was_active = true;
1482 }
1483
cdbb70bb
CH		 1484 return was_active;
1485}
1486
c66ac9db
NB		 1487/*
1488 * Handle SAM-esque emulation for generic transport request failures.
1489 */
de103c93
CH		 1490void transport_generic_request_failure(struct se_cmd *cmd,
1491 sense_reason_t sense_reason)
c66ac9db 1492{
07bde79a
NB		 1493 int ret = 0;
1494
6708bb27 1495 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1496 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1497 cmd->t_task_cdb[0]);
de103c93 1498 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1499 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1500 cmd->t_state, sense_reason);
d43d6aea 1501 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1502 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1503 (cmd->transport_state & CMD_T_STOP) != 0,
1504 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1505
c66ac9db
NB		 1506 /*
1507 * For SAM Task Attribute emulation for failed struct se_cmd
1508 */
019c4ca6 1509 transport_complete_task_attr(cmd);
c66ac9db 1510
de103c93 1511 switch (sense_reason) {
03e98c9e
NB		 1512 case TCM_NON_EXISTENT_LUN:
1513 case TCM_UNSUPPORTED_SCSI_OPCODE:
1514 case TCM_INVALID_CDB_FIELD:
1515 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1516 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1517 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1518 case TCM_UNKNOWN_MODE_PAGE:
1519 case TCM_WRITE_PROTECTED:
e2397c70 1520 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1521 case TCM_CHECK_CONDITION_ABORT_CMD:
1522 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1523 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1524 break;
de103c93
CH		 1525 case TCM_OUT_OF_RESOURCES:
1526 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1527 break;
03e98c9e 1528 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1529 /*
1530 * No SENSE Data payload for this case, set SCSI Status
1531 * and queue the response to $FABRIC_MOD.
1532 *
1533 * Uses linux/include/scsi/scsi.h SAM status codes defs
1534 */
1535 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1536 /*
1537 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1538 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1539 * CONFLICT STATUS.
1540 *
1541 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1542 */
e3d6f909 1543 if (cmd->se_sess &&
0fd97ccf 1544 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1545 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1546 cmd->orig_fe_lun, 0x2C,
1547 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1548
07bde79a 1549 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1550 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1551 goto queue_full;
c66ac9db 1552 goto check_stop;
c66ac9db 1553 default:
6708bb27 1554 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1555 cmd->t_task_cdb[0], sense_reason);
1556 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1557 break;
1558 }
f3146437 1559
de103c93 1560 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1561 if (ret == -EAGAIN || ret == -ENOMEM)
1562 goto queue_full;
07bde79a 1563
c66ac9db
NB		 1564check_stop:
1565 transport_lun_remove_cmd(cmd);
6708bb27 1566 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1567 ;
07bde79a
NB		 1568 return;
1569
1570queue_full:
e057f533
CH		 1571 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1572 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1573}
2fbff127 1574EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1575
5f41a31d 1576static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1577{
de103c93 1578 sense_reason_t ret;
5f41a31d 1579
de103c93
CH		 1580 if (cmd->execute_cmd) {
1581 ret = cmd->execute_cmd(cmd);
1582 if (ret) {
1583 spin_lock_irq(&cmd->t_state_lock);
1584 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1585 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1586
de103c93
CH		 1587 transport_generic_request_failure(cmd, ret);
1588 }
5f41a31d
CH		 1589 }
1590}
1591
019c4ca6 1592static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1593{
1594 struct se_device *dev = cmd->se_dev;
1595
019c4ca6
CH		 1596 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1597 return false;
5f41a31d 1598
c66ac9db 1599 /*
25985edc 1600 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1601 * to allow the passed struct se_cmd list of tasks to the front of the list.
1602 */
5f41a31d
CH		 1603 switch (cmd->sam_task_attr) {
1604 case MSG_HEAD_TAG:
1605 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1606 "se_ordered_id: %u\n",
1607 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1608 return false;
5f41a31d
CH		 1609 case MSG_ORDERED_TAG:
1610 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1611 smp_mb__after_atomic_inc();
1612
5f41a31d
CH		 1613 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1614 " se_ordered_id: %u\n",
1615 cmd->t_task_cdb[0], cmd->se_ordered_id);
1616
c66ac9db 1617 /*
5f41a31d
CH		 1618 * Execute an ORDERED command if no other older commands
1619 * exist that need to be completed first.
c66ac9db 1620 */
5f41a31d 1621 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1622 return false;
5f41a31d
CH		 1623 break;
1624 default:
c66ac9db
NB		 1625 /*
1626 * For SIMPLE and UNTAGGED Task Attribute commands
1627 */
5f41a31d 1628 atomic_inc(&dev->simple_cmds);
c66ac9db 1629 smp_mb__after_atomic_inc();
5f41a31d 1630 break;
c66ac9db 1631 }
5f41a31d 1632
019c4ca6
CH		 1633 if (atomic_read(&dev->dev_ordered_sync) == 0)
1634 return false;
c66ac9db 1635
019c4ca6
CH		 1636 spin_lock(&dev->delayed_cmd_lock);
1637 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1638 spin_unlock(&dev->delayed_cmd_lock);
1639
1640 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1641 " delayed CMD list, se_ordered_id: %u\n",
1642 cmd->t_task_cdb[0], cmd->sam_task_attr,
1643 cmd->se_ordered_id);
1644 return true;
1645}
1646
1647void target_execute_cmd(struct se_cmd *cmd)
1648{
1649 /*
1650 * If the received CDB has aleady been aborted stop processing it here.
1651 */
5bd665f2
LT		 1652 if (transport_check_aborted_status(cmd, 1)) {
1653 complete(&cmd->transport_lun_stop_comp);
5f41a31d 1654 return;
c66ac9db 1655 }
c66ac9db 1656
c66ac9db 1657 /*
019c4ca6
CH		 1658 * Determine if IOCTL context caller in requesting the stopping of this
1659 * command for LUN shutdown purposes.
c66ac9db 1660 */
019c4ca6
CH		 1661 spin_lock_irq(&cmd->t_state_lock);
1662 if (cmd->transport_state & CMD_T_LUN_STOP) {
1663 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1664 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1665
1666 cmd->transport_state &= ~CMD_T_ACTIVE;
1667 spin_unlock_irq(&cmd->t_state_lock);
1668 complete(&cmd->transport_lun_stop_comp);
1669 return;
1670 }
1671 /*
1672 * Determine if frontend context caller is requesting the stopping of
1673 * this command for frontend exceptions.
1674 */
1675 if (cmd->transport_state & CMD_T_STOP) {
1676 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1677 __func__, __LINE__,
1678 cmd->se_tfo->get_task_tag(cmd));
1679
1680 spin_unlock_irq(&cmd->t_state_lock);
1681 complete(&cmd->t_transport_stop_comp);
1682 return;
1683 }
1684
1685 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1686 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6
CH		 1687 spin_unlock_irq(&cmd->t_state_lock);
1688
1a398b97
NB		 1689 if (target_handle_task_attr(cmd)) {
1690 spin_lock_irq(&cmd->t_state_lock);
1691 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1692 spin_unlock_irq(&cmd->t_state_lock);
1693 return;
1694 }
1695
1696 __target_execute_cmd(cmd);
c66ac9db 1697}
70baf0ab 1698EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1699
5f41a31d
CH		 1700/*
1701 * Process all commands up to the last received ORDERED task attribute which
1702 * requires another blocking boundary
1703 */
1704static void target_restart_delayed_cmds(struct se_device *dev)
1705{
1706 for (;;) {
1707 struct se_cmd *cmd;
1708
1709 spin_lock(&dev->delayed_cmd_lock);
1710 if (list_empty(&dev->delayed_cmd_list)) {
1711 spin_unlock(&dev->delayed_cmd_lock);
1712 break;
1713 }
1714
1715 cmd = list_entry(dev->delayed_cmd_list.next,
1716 struct se_cmd, se_delayed_node);
1717 list_del(&cmd->se_delayed_node);
1718 spin_unlock(&dev->delayed_cmd_lock);
1719
1720 __target_execute_cmd(cmd);
1721
1722 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1723 break;
1724 }
1725}
1726
c66ac9db 1727/*
35e0e757 1728 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1729 * and ordered cmds need to have their tasks added to the execution queue.
1730 */
1731static void transport_complete_task_attr(struct se_cmd *cmd)
1732{
5951146d 1733 struct se_device *dev = cmd->se_dev;
c66ac9db 1734
019c4ca6
CH		 1735 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1736 return;
1737
e66ecd50 1738 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1739 atomic_dec(&dev->simple_cmds);
1740 smp_mb__after_atomic_dec();
1741 dev->dev_cur_ordered_id++;
6708bb27 1742 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1743 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1744 cmd->se_ordered_id);
e66ecd50 1745 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1746 dev->dev_cur_ordered_id++;
6708bb27 1747 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1748 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1749 cmd->se_ordered_id);
e66ecd50 1750 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1751 atomic_dec(&dev->dev_ordered_sync);
1752 smp_mb__after_atomic_dec();
c66ac9db
NB		 1753
1754 dev->dev_cur_ordered_id++;
6708bb27 1755 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1756 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1757 }
c66ac9db 1758
5f41a31d 1759 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1760}
1761
e057f533 1762static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1763{
1764 int ret = 0;
1765
019c4ca6 1766 transport_complete_task_attr(cmd);
e057f533
CH		 1767
1768 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1769 ret = cmd->se_tfo->queue_status(cmd);
1770 if (ret)
1771 goto out;
1772 }
07bde79a
NB		 1773
1774 switch (cmd->data_direction) {
1775 case DMA_FROM_DEVICE:
1776 ret = cmd->se_tfo->queue_data_in(cmd);
1777 break;
1778 case DMA_TO_DEVICE:
ec98f782 1779 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 1780 ret = cmd->se_tfo->queue_data_in(cmd);
1781 if (ret < 0)
e057f533 1782 break;
07bde79a
NB		 1783 }
1784 /* Fall through for DMA_TO_DEVICE */
1785 case DMA_NONE:
1786 ret = cmd->se_tfo->queue_status(cmd);
1787 break;
1788 default:
1789 break;
1790 }
1791
e057f533
CH		 1792out:
1793 if (ret < 0) {
1794 transport_handle_queue_full(cmd, cmd->se_dev);
1795 return;
1796 }
1797 transport_lun_remove_cmd(cmd);
1798 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1799}
1800
1801static void transport_handle_queue_full(
1802 struct se_cmd *cmd,
e057f533 1803 struct se_device *dev)
07bde79a
NB		 1804{
1805 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1806 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1807 atomic_inc(&dev->dev_qf_count);
1808 smp_mb__after_atomic_inc();
1809 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1810
1811 schedule_work(&cmd->se_dev->qf_work_queue);
1812}
1813
35e0e757 1814static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1815{
35e0e757 1816 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1817 int ret;
35e0e757 1818
c66ac9db
NB		 1819 /*
1820 * Check if we need to move delayed/dormant tasks from cmds on the
1821 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1822 * Attribute.
1823 */
019c4ca6
CH		 1824 transport_complete_task_attr(cmd);
1825
07bde79a
NB		 1826 /*
1827 * Check to schedule QUEUE_FULL work, or execute an existing
1828 * cmd->transport_qf_callback()
1829 */
1830 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1831 schedule_work(&cmd->se_dev->qf_work_queue);
1832
c66ac9db 1833 /*
d5829eac 1834 * Check if we need to send a sense buffer from
c66ac9db
NB		 1835 * the struct se_cmd in question.
1836 */
1837 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1838 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1839 ret = transport_send_check_condition_and_sense(
1840 cmd, 0, 1);
1841 if (ret == -EAGAIN || ret == -ENOMEM)
1842 goto queue_full;
1843
1844 transport_lun_remove_cmd(cmd);
1845 transport_cmd_check_stop_to_fabric(cmd);
1846 return;
c66ac9db
NB		 1847 }
1848 /*
25985edc 1849 * Check for a callback, used by amongst other things
c66ac9db
NB		 1850 * XDWRITE_READ_10 emulation.
1851 */
1852 if (cmd->transport_complete_callback)
1853 cmd->transport_complete_callback(cmd);
1854
1855 switch (cmd->data_direction) {
1856 case DMA_FROM_DEVICE:
1857 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1858 if (cmd->se_lun->lun_sep) {
1859 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1860 cmd->data_length;
1861 }
1862 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1863
07bde79a 1864 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1865 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1866 goto queue_full;
c66ac9db
NB		 1867 break;
1868 case DMA_TO_DEVICE:
1869 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1870 if (cmd->se_lun->lun_sep) {
1871 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1872 cmd->data_length;
1873 }
1874 spin_unlock(&cmd->se_lun->lun_sep_lock);
1875 /*
1876 * Check if we need to send READ payload for BIDI-COMMAND
1877 */
ec98f782 1878 if (cmd->t_bidi_data_sg) {
c66ac9db 1879 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1880 if (cmd->se_lun->lun_sep) {
1881 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1882 cmd->data_length;
1883 }
1884 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1885 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1886 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1887 goto queue_full;
c66ac9db
NB		 1888 break;
1889 }
1890 /* Fall through for DMA_TO_DEVICE */
1891 case DMA_NONE:
07bde79a 1892 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1893 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1894 goto queue_full;
c66ac9db
NB		 1895 break;
1896 default:
1897 break;
1898 }
1899
1900 transport_lun_remove_cmd(cmd);
1901 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1902 return;
1903
1904queue_full:
6708bb27 1905 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1906 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1907 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1908 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1909}
1910
6708bb27 1911static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 1912{
ec98f782 1913 struct scatterlist *sg;
ec98f782 1914 int count;
c66ac9db 1915
6708bb27
AG		 1916 for_each_sg(sgl, sg, nents, count)
1917 __free_page(sg_page(sg));
c66ac9db 1918
6708bb27
AG		 1919 kfree(sgl);
1920}
c66ac9db 1921
6708bb27
AG		 1922static inline void transport_free_pages(struct se_cmd *cmd)
1923{
1924 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
1925 return;
1926
1927 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 1928 cmd->t_data_sg = NULL;
1929 cmd->t_data_nents = 0;
c66ac9db 1930
6708bb27 1931 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 1932 cmd->t_bidi_data_sg = NULL;
1933 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 1934}
1935
e26d99ae
CH		 1936/**
1937 * transport_release_cmd - free a command
1938 * @cmd: command to free
1939 *
1940 * This routine unconditionally frees a command, and reference counting
1941 * or list removal must be done in the caller.
1942 */
d5ddad41 1943static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 1944{
1945 BUG_ON(!cmd->se_tfo);
1946
c8e31f26 1947 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 1948 core_tmr_release_req(cmd->se_tmr_req);
1949 if (cmd->t_task_cdb != cmd->__t_task_cdb)
1950 kfree(cmd->t_task_cdb);
1951 /*
7481deb4
NB		 1952 * If this cmd has been setup with target_get_sess_cmd(), drop
1953 * the kref and call ->release_cmd() in kref callback.
e26d99ae 1954 */
d5ddad41
NB		 1955 if (cmd->check_release != 0)
1956 return target_put_sess_cmd(cmd->se_sess, cmd);
1957
e26d99ae 1958 cmd->se_tfo->release_cmd(cmd);
d5ddad41 1959 return 1;
e26d99ae
CH		 1960}
1961
d3df7825
CH		 1962/**
1963 * transport_put_cmd - release a reference to a command
1964 * @cmd: command to release
1965 *
1966 * This routine releases our reference to the command and frees it if possible.
1967 */
d5ddad41 1968static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 1969{
c66ac9db 1970 transport_free_pages(cmd);
d5ddad41 1971 return transport_release_cmd(cmd);
c66ac9db 1972}
c66ac9db 1973
4949314c 1974void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 1975{
ec98f782 1976 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 1977 struct page **pages;
1978 int i;
05d1c7c0
AG		 1979
1980 /*
ec98f782
AG		 1981 * We need to take into account a possible offset here for fabrics like
1982 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
1983 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 1984 */
4949314c
AG		 1985 if (!cmd->t_data_nents)
1986 return NULL;
3717ef0c
PB		 1987
1988 BUG_ON(!sg);
1989 if (cmd->t_data_nents == 1)
4949314c
AG		 1990 return kmap(sg_page(sg)) + sg->offset;
1991
1992 /* >1 page. use vmap */
1993 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 1994 if (!pages)
4949314c
AG		 1995 return NULL;
1996
1997 /* convert sg[] to pages[] */
1998 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
1999 pages[i] = sg_page(sg);
2000 }
2001
2002 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2003 kfree(pages);
de103c93 2004 if (!cmd->t_data_vmap)
4949314c
AG		 2005 return NULL;
2006
2007 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2008}
4949314c 2009EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2010
4949314c 2011void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2012{
a1edf9cf 2013 if (!cmd->t_data_nents) {
4949314c 2014 return;
a1edf9cf 2015 } else if (cmd->t_data_nents == 1) {
4949314c 2016 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2017 return;
2018 }
4949314c
AG		 2019
2020 vunmap(cmd->t_data_vmap);
2021 cmd->t_data_vmap = NULL;
05d1c7c0 2022}
4949314c 2023EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2024
c66ac9db 2025static int
05d1c7c0 2026transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2027{
ec98f782
AG		 2028 u32 length = cmd->data_length;
2029 unsigned int nents;
2030 struct page *page;
9db9da33 2031 gfp_t zero_flag;
ec98f782 2032 int i = 0;
c66ac9db 2033
ec98f782
AG		 2034 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2035 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2036 if (!cmd->t_data_sg)
2037 return -ENOMEM;
c66ac9db 2038
ec98f782
AG		 2039 cmd->t_data_nents = nents;
2040 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2041
64f1db38 2042 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2043
ec98f782
AG		 2044 while (length) {
2045 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2046 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2047 if (!page)
2048 goto out;
c66ac9db 2049
ec98f782
AG		 2050 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2051 length -= page_len;
2052 i++;
c66ac9db 2053 }
c66ac9db 2054 return 0;
c66ac9db 2055
ec98f782 2056out:
d0e27c88 2057 while (i > 0) {
ec98f782 2058 i--;
d0e27c88 2059 __free_page(sg_page(&cmd->t_data_sg[i]));
c66ac9db 2060 }
ec98f782
AG		 2061 kfree(cmd->t_data_sg);
2062 cmd->t_data_sg = NULL;
2063 return -ENOMEM;
c66ac9db
NB		 2064}
2065
da0f7619 2066/*
b16a35b0
AG		 2067 * Allocate any required resources to execute the command. For writes we
2068 * might not have the payload yet, so notify the fabric via a call to
2069 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2070 */
de103c93
CH		 2071sense_reason_t
2072transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2073{
c66ac9db
NB		 2074 int ret = 0;
2075
2076 /*
2077 * Determine is the TCM fabric module has already allocated physical
2078 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2079 * beforehand.
c66ac9db 2080 */
ec98f782
AG		 2081 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2082 cmd->data_length) {
05d1c7c0 2083 ret = transport_generic_get_mem(cmd);
c66ac9db 2084 if (ret < 0)
de103c93 2085 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2086 }
c66ac9db 2087 /*
c3196f0c
CH		 2088 * If this command is not a write we can execute it right here,
2089 * for write buffers we need to notify the fabric driver first
2090 * and let it call back once the write buffers are ready.
c66ac9db 2091 */
5f41a31d 2092 target_add_to_state_list(cmd);
c3196f0c
CH		 2093 if (cmd->data_direction != DMA_TO_DEVICE) {
2094 target_execute_cmd(cmd);
2095 return 0;
2096 }
862e6389 2097 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2098
2099 ret = cmd->se_tfo->write_pending(cmd);
2100 if (ret == -EAGAIN || ret == -ENOMEM)
2101 goto queue_full;
2102
de103c93
CH		 2103 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2104 WARN_ON(ret);
2105
b69c1fcf 2106 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2107
c3196f0c
CH		 2108queue_full:
2109 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2110 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2111 transport_handle_queue_full(cmd, cmd->se_dev);
2112 return 0;
c66ac9db 2113}
a1d8b49a 2114EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2115
e057f533 2116static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2117{
f147abb4
NB		 2118 int ret;
2119
2120 ret = cmd->se_tfo->write_pending(cmd);
2121 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2122 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2123 cmd);
2124 transport_handle_queue_full(cmd, cmd->se_dev);
2125 }
07bde79a
NB		 2126}
2127
d5ddad41 2128int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2129{
d5ddad41
NB		 2130 int ret = 0;
2131
d14921d6 2132 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2133 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2134 transport_wait_for_tasks(cmd);
2135
d5ddad41 2136 ret = transport_release_cmd(cmd);
d14921d6
NB		 2137 } else {
2138 if (wait_for_tasks)
2139 transport_wait_for_tasks(cmd);
2140
82f1c8a4 2141 if (cmd->se_lun)
c66ac9db 2142 transport_lun_remove_cmd(cmd);
c66ac9db 2143
d5ddad41 2144 ret = transport_put_cmd(cmd);
c66ac9db 2145 }
d5ddad41 2146 return ret;
c66ac9db
NB		 2147}
2148EXPORT_SYMBOL(transport_generic_free_cmd);
2149
a17f091d
NB		 2150/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2151 * @se_sess: session to reference
2152 * @se_cmd: command descriptor to add
a6360785 2153 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2154 */
20361e69 2155int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2156 bool ack_kref)
a17f091d
NB		 2157{
2158 unsigned long flags;
bc187ea6 2159 int ret = 0;
a17f091d 2160
7481deb4 2161 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2162 /*
2163 * Add a second kref if the fabric caller is expecting to handle
2164 * fabric acknowledgement that requires two target_put_sess_cmd()
2165 * invocations before se_cmd descriptor release.
2166 */
86715569 2167 if (ack_kref == true) {
a6360785 2168 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2169 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2170 }
7481deb4 2171
a17f091d 2172 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2173 if (se_sess->sess_tearing_down) {
2174 ret = -ESHUTDOWN;
2175 goto out;
2176 }
a17f091d
NB		 2177 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2178 se_cmd->check_release = 1;
bc187ea6
RD		 2179
2180out:
a17f091d 2181 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2182 return ret;
a17f091d 2183}
20361e69 2184EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2185
7481deb4 2186static void target_release_cmd_kref(struct kref *kref)
a17f091d 2187{
7481deb4
NB		 2188 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2189 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2190
a17f091d 2191 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2192 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2193 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2194 return;
a17f091d 2195 }
a17f091d 2196 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2197 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2198 complete(&se_cmd->cmd_wait_comp);
7481deb4 2199 return;
a17f091d
NB		 2200 }
2201 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2202 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2203
7481deb4
NB		 2204 se_cmd->se_tfo->release_cmd(se_cmd);
2205}
2206
2207/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2208 * @se_sess: session to reference
2209 * @se_cmd: command descriptor to drop
2210 */
2211int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2212{
ccf5ae83
JE		 2213 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2214 &se_sess->sess_cmd_lock);
a17f091d
NB		 2215}
2216EXPORT_SYMBOL(target_put_sess_cmd);
2217
1c7b13fe
RD		 2218/* target_sess_cmd_list_set_waiting - Flag all commands in
2219 * sess_cmd_list to complete cmd_wait_comp. Set
2220 * sess_tearing_down so no more commands are queued.
2221 * @se_sess: session to flag
a17f091d 2222 */
1c7b13fe 2223void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2224{
2225 struct se_cmd *se_cmd;
2226 unsigned long flags;
2227
a17f091d 2228 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2229 if (se_sess->sess_tearing_down) {
2230 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2231 return;
2232 }
1c7b13fe 2233 se_sess->sess_tearing_down = 1;
9b31a328 2234 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2235
9b31a328 2236 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2237 se_cmd->cmd_wait_set = 1;
2238
2239 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2240}
1c7b13fe 2241EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2242
2243/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2244 * @se_sess: session to wait for active I/O
a17f091d 2245 */
be646c2d 2246void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2247{
2248 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2249 unsigned long flags;
a17f091d
NB		 2250
2251 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2252 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2253 list_del(&se_cmd->se_cmd_list);
2254
2255 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2256 " %d\n", se_cmd, se_cmd->t_state,
2257 se_cmd->se_tfo->get_cmd_state(se_cmd));
2258
be646c2d
JE		 2259 wait_for_completion(&se_cmd->cmd_wait_comp);
2260 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2261 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2262 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2263
2264 se_cmd->se_tfo->release_cmd(se_cmd);
2265 }
9b31a328
NB		 2266
2267 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2268 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2269 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2270
a17f091d
NB		 2271}
2272EXPORT_SYMBOL(target_wait_for_sess_cmds);
2273
c66ac9db
NB		 2274/* transport_lun_wait_for_tasks():
2275 *
2276 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2277 * an struct se_lun to be successfully shutdown.
2278 */
2279static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2280{
2281 unsigned long flags;
cf572a96
CH		 2282 int ret = 0;
2283
c66ac9db
NB		 2284 /*
2285 * If the frontend has already requested this struct se_cmd to
2286 * be stopped, we can safely ignore this struct se_cmd.
2287 */
a1d8b49a 2288 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2289 if (cmd->transport_state & CMD_T_STOP) {
2290 cmd->transport_state &= ~CMD_T_LUN_STOP;
2291
2292 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2293 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2294 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
862e6389 2295 transport_cmd_check_stop(cmd, false, false);
e3d6f909 2296 return -EPERM;
c66ac9db 2297 }
7d680f3b 2298 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2299 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2300
cf572a96
CH		 2301 // XXX: audit task_flags checks.
2302 spin_lock_irqsave(&cmd->t_state_lock, flags);
2303 if ((cmd->transport_state & CMD_T_BUSY) &&
2304 (cmd->transport_state & CMD_T_SENT)) {
2305 if (!target_stop_cmd(cmd, &flags))
2306 ret++;
cf572a96 2307 }
5f41a31d 2308 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2309
785fdf70
CH		 2310 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2311 " %d\n", cmd, ret);
c66ac9db 2312 if (!ret) {
6708bb27 2313 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2314 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2315 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2316 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2317 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2318 }
c66ac9db
NB		 2319
2320 return 0;
2321}
2322
c66ac9db
NB		 2323static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2324{
2325 struct se_cmd *cmd = NULL;
2326 unsigned long lun_flags, cmd_flags;
2327 /*
2328 * Do exception processing and return CHECK_CONDITION status to the
2329 * Initiator Port.
2330 */
2331 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2332 while (!list_empty(&lun->lun_cmd_list)) {
2333 cmd = list_first_entry(&lun->lun_cmd_list,
2334 struct se_cmd, se_lun_node);
3d26fea0 2335 list_del_init(&cmd->se_lun_node);
5951146d 2336
a1d8b49a 2337 spin_lock(&cmd->t_state_lock);
6708bb27 2338 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2339 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2340 cmd->se_lun->unpacked_lun,
2341 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2342 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2343 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2344
2345 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2346
6708bb27
AG		 2347 if (!cmd->se_lun) {
2348 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2349 cmd->se_tfo->get_task_tag(cmd),
2350 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2351 BUG();
2352 }
2353 /*
2354 * If the Storage engine still owns the iscsi_cmd_t, determine
2355 * and/or stop its context.
2356 */
6708bb27 2357 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2358 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2359 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2360
e3d6f909 2361 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2362 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2363 continue;
2364 }
2365
6708bb27 2366 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2367 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2368 cmd->se_lun->unpacked_lun,
2369 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2370
a1d8b49a 2371 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2372 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2373 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2374 goto check_cond;
2375 }
7d680f3b 2376 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2377 target_remove_from_state_list(cmd);
a1d8b49a 2378 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2379
c66ac9db
NB		 2380 /*
2381 * The Storage engine stopped this struct se_cmd before it was
2382 * send to the fabric frontend for delivery back to the
2383 * Initiator Node. Return this SCSI CDB back with an
2384 * CHECK_CONDITION status.
2385 */
2386check_cond:
2387 transport_send_check_condition_and_sense(cmd,
2388 TCM_NON_EXISTENT_LUN, 0);
2389 /*
2390 * If the fabric frontend is waiting for this iscsi_cmd_t to
2391 * be released, notify the waiting thread now that LU has
2392 * finished accessing it.
2393 */
a1d8b49a 2394 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2395 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2396 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2397 " struct se_cmd: %p ITT: 0x%08x\n",
2398 lun->unpacked_lun,
e3d6f909 2399 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2400
a1d8b49a 2401 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2402 cmd_flags);
862e6389 2403 transport_cmd_check_stop(cmd, false, false);
a1d8b49a 2404 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2405 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2406 continue;
2407 }
6708bb27 2408 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2409 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2410
a1d8b49a 2411 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2412 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2413 }
2414 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2415}
2416
2417static int transport_clear_lun_thread(void *p)
2418{
8359cf43 2419 struct se_lun *lun = p;
c66ac9db
NB		 2420
2421 __transport_clear_lun_from_sessions(lun);
2422 complete(&lun->lun_shutdown_comp);
2423
2424 return 0;
2425}
2426
2427int transport_clear_lun_from_sessions(struct se_lun *lun)
2428{
2429 struct task_struct *kt;
2430
5951146d 2431 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2432 "tcm_cl_%u", lun->unpacked_lun);
2433 if (IS_ERR(kt)) {
6708bb27 2434 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2435 return PTR_ERR(kt);
c66ac9db
NB		 2436 }
2437 wait_for_completion(&lun->lun_shutdown_comp);
2438
2439 return 0;
2440}
2441
d14921d6
NB		 2442/**
2443 * transport_wait_for_tasks - wait for completion to occur
2444 * @cmd: command to wait
c66ac9db 2445 *
d14921d6
NB		 2446 * Called from frontend fabric context to wait for storage engine
2447 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2448 */
a17f091d 2449bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2450{
2451 unsigned long flags;
2452
a1d8b49a 2453 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2454 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2455 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2456 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2457 return false;
d14921d6 2458 }
cb4f4d3c 2459
c8e31f26
AG		 2460 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2461 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2462 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2463 return false;
d14921d6 2464 }
c66ac9db
NB		 2465 /*
2466 * If we are already stopped due to an external event (ie: LUN shutdown)
2467 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2468 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2469 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2470 * has completed its operation on the struct se_cmd.
2471 */
7d680f3b 2472 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2473 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2474 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2475 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2476 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2477 /*
2478 * There is a special case for WRITES where a FE exception +
2479 * LUN shutdown means ConfigFS context is still sleeping on
2480 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2481 * We go ahead and up transport_lun_stop_comp just to be sure
2482 * here.
2483 */
a1d8b49a
AG		 2484 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2485 complete(&cmd->transport_lun_stop_comp);
2486 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2487 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2488
cf572a96 2489 target_remove_from_state_list(cmd);
c66ac9db
NB		 2490 /*
2491 * At this point, the frontend who was the originator of this
2492 * struct se_cmd, now owns the structure and can be released through
2493 * normal means below.
2494 */
6708bb27 2495 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2496 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2497 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2498 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2499
7d680f3b 2500 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2501 }
7d680f3b 2502
3d28934a 2503 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2504 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2505 return false;
d14921d6 2506 }
c66ac9db 2507
7d680f3b 2508 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2509
6708bb27 2510 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2511 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2512 cmd, cmd->se_tfo->get_task_tag(cmd),
2513 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2514
a1d8b49a 2515 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2516
a1d8b49a 2517 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2518
a1d8b49a 2519 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2520 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2521
35d1efe8 2522 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2523 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2524 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2525
d14921d6 2526 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2527
2528 return true;
c66ac9db 2529}
d14921d6 2530EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2531
2532static int transport_get_sense_codes(
2533 struct se_cmd *cmd,
2534 u8 *asc,
2535 u8 *ascq)
2536{
2537 *asc = cmd->scsi_asc;
2538 *ascq = cmd->scsi_ascq;
2539
2540 return 0;
2541}
2542
de103c93
CH		 2543int
2544transport_send_check_condition_and_sense(struct se_cmd *cmd,
2545 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2546{
2547 unsigned char *buffer = cmd->sense_buffer;
2548 unsigned long flags;
c66ac9db
NB		 2549 u8 asc = 0, ascq = 0;
2550
a1d8b49a 2551 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2552 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2553 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2554 return 0;
2555 }
2556 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2557 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2558
2559 if (!reason && from_transport)
2560 goto after_reason;
2561
2562 if (!from_transport)
2563 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2564
c66ac9db
NB		 2565 /*
2566 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2567 * SENSE KEY values from include/scsi/scsi.h
2568 */
2569 switch (reason) {
ba829137
HR		 2570 case TCM_NO_SENSE:
2571 /* CURRENT ERROR */
2572 buffer[0] = 0x70;
2573 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2574 /* Not Ready */
2575 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2576 /* NO ADDITIONAL SENSE INFORMATION */
2577 buffer[SPC_ASC_KEY_OFFSET] = 0;
2578 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2579 break;
c66ac9db 2580 case TCM_NON_EXISTENT_LUN:
eb39d340 2581 /* CURRENT ERROR */
9c58b7dd
RD		 2582 buffer[0] = 0x70;
2583 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2584 /* ILLEGAL REQUEST */
9c58b7dd 2585 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2586 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2587 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2588 break;
c66ac9db
NB		 2589 case TCM_UNSUPPORTED_SCSI_OPCODE:
2590 case TCM_SECTOR_COUNT_TOO_MANY:
2591 /* CURRENT ERROR */
9c58b7dd
RD		 2592 buffer[0] = 0x70;
2593 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2594 /* ILLEGAL REQUEST */
9c58b7dd 2595 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2596 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2597 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2598 break;
2599 case TCM_UNKNOWN_MODE_PAGE:
2600 /* CURRENT ERROR */
9c58b7dd
RD		 2601 buffer[0] = 0x70;
2602 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2603 /* ILLEGAL REQUEST */
9c58b7dd 2604 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2605 /* INVALID FIELD IN CDB */
9c58b7dd 2606 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2607 break;
2608 case TCM_CHECK_CONDITION_ABORT_CMD:
2609 /* CURRENT ERROR */
9c58b7dd
RD		 2610 buffer[0] = 0x70;
2611 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2612 /* ABORTED COMMAND */
9c58b7dd 2613 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2614 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2615 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2616 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2617 break;
2618 case TCM_INCORRECT_AMOUNT_OF_DATA:
2619 /* CURRENT ERROR */
9c58b7dd
RD		 2620 buffer[0] = 0x70;
2621 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2622 /* ABORTED COMMAND */
9c58b7dd 2623 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2624 /* WRITE ERROR */
9c58b7dd 2625 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2626 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2627 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2628 break;
2629 case TCM_INVALID_CDB_FIELD:
2630 /* CURRENT ERROR */
9c58b7dd
RD		 2631 buffer[0] = 0x70;
2632 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2633 /* ILLEGAL REQUEST */
9c58b7dd 2634 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2635 /* INVALID FIELD IN CDB */
9c58b7dd 2636 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2637 break;
2638 case TCM_INVALID_PARAMETER_LIST:
2639 /* CURRENT ERROR */
9c58b7dd
RD		 2640 buffer[0] = 0x70;
2641 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2642 /* ILLEGAL REQUEST */
9c58b7dd 2643 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2644 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2645 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2646 break;
bb992e72
RD		 2647 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2648 /* CURRENT ERROR */
2649 buffer[0] = 0x70;
2650 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2651 /* ILLEGAL REQUEST */
2652 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2653 /* PARAMETER LIST LENGTH ERROR */
2654 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2655 break;
c66ac9db
NB		 2656 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2657 /* CURRENT ERROR */
9c58b7dd
RD		 2658 buffer[0] = 0x70;
2659 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2660 /* ABORTED COMMAND */
9c58b7dd 2661 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2662 /* WRITE ERROR */
9c58b7dd 2663 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2664 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2665 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2666 break;
2667 case TCM_SERVICE_CRC_ERROR:
2668 /* CURRENT ERROR */
9c58b7dd
RD		 2669 buffer[0] = 0x70;
2670 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2671 /* ABORTED COMMAND */
9c58b7dd 2672 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2673 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2674 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2675 /* N/A */
9c58b7dd 2676 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2677 break;
2678 case TCM_SNACK_REJECTED:
2679 /* CURRENT ERROR */
9c58b7dd
RD		 2680 buffer[0] = 0x70;
2681 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2682 /* ABORTED COMMAND */
9c58b7dd 2683 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2684 /* READ ERROR */
9c58b7dd 2685 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2686 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2687 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2688 break;
2689 case TCM_WRITE_PROTECTED:
2690 /* CURRENT ERROR */
9c58b7dd
RD		 2691 buffer[0] = 0x70;
2692 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2693 /* DATA PROTECT */
9c58b7dd 2694 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2695 /* WRITE PROTECTED */
9c58b7dd 2696 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2697 break;
e2397c70
RD		 2698 case TCM_ADDRESS_OUT_OF_RANGE:
2699 /* CURRENT ERROR */
9c58b7dd
RD		 2700 buffer[0] = 0x70;
2701 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2702 /* ILLEGAL REQUEST */
9c58b7dd 2703 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2704 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2705 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2706 break;
c66ac9db
NB		 2707 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2708 /* CURRENT ERROR */
9c58b7dd
RD		 2709 buffer[0] = 0x70;
2710 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2711 /* UNIT ATTENTION */
9c58b7dd 2712 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2713 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2714 buffer[SPC_ASC_KEY_OFFSET] = asc;
2715 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2716 break;
2717 case TCM_CHECK_CONDITION_NOT_READY:
2718 /* CURRENT ERROR */
9c58b7dd
RD		 2719 buffer[0] = 0x70;
2720 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2721 /* Not Ready */
9c58b7dd 2722 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2723 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2724 buffer[SPC_ASC_KEY_OFFSET] = asc;
2725 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2726 break;
2727 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2728 default:
2729 /* CURRENT ERROR */
9c58b7dd
RD		 2730 buffer[0] = 0x70;
2731 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2732 /*
2733 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2734 * Solaris initiators. Returning NOT READY instead means the
2735 * operations will be retried a finite number of times and we
2736 * can survive intermittent errors.
2737 */
2738 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2739 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2740 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2741 break;
2742 }
2743 /*
2744 * This code uses linux/include/scsi/scsi.h SAM status codes!
2745 */
2746 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2747 /*
2748 * Automatically padded, this value is encoded in the fabric's
2749 * data_length response PDU containing the SCSI defined sense data.
2750 */
9c58b7dd 2751 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2752
2753after_reason:
07bde79a 2754 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2755}
2756EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2757
2758int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2759{
c18bc7d8
RD		 2760 if (!(cmd->transport_state & CMD_T_ABORTED))
2761 return 0;
c66ac9db 2762
c18bc7d8
RD		 2763 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2764 return 1;
8b1e1244 2765
c18bc7d8
RD		 2766 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2767 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2768
c18bc7d8
RD		 2769 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
2770 cmd->se_tfo->queue_status(cmd);
2771
2772 return 1;
c66ac9db
NB		 2773}
2774EXPORT_SYMBOL(transport_check_aborted_status);
2775
2776void transport_send_task_abort(struct se_cmd *cmd)
2777{
c252f003
NB		 2778 unsigned long flags;
2779
2780 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2781 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2782 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2783 return;
2784 }
2785 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2786
c66ac9db
NB		 2787 /*
2788 * If there are still expected incoming fabric WRITEs, we wait
2789 * until until they have completed before sending a TASK_ABORTED
2790 * response. This response with TASK_ABORTED status will be
2791 * queued back to fabric module by transport_check_aborted_status().
2792 */
2793 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2794 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2795 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2796 smp_mb__after_atomic_inc();
c66ac9db
NB		 2797 }
2798 }
2799 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2800
72b59d6e
RD		 2801 transport_lun_remove_cmd(cmd);
2802
6708bb27 2803 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2804 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2805 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2806
e3d6f909 2807 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2808}
2809
af877292 2810static void target_tmr_work(struct work_struct *work)
c66ac9db 2811{
af877292 2812 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2813 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2814 struct se_tmr_req *tmr = cmd->se_tmr_req;
2815 int ret;
2816
2817 switch (tmr->function) {
5c6cd613 2818 case TMR_ABORT_TASK:
3d28934a 2819 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2820 break;
5c6cd613
NB		 2821 case TMR_ABORT_TASK_SET:
2822 case TMR_CLEAR_ACA:
2823 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2824 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2825 break;
5c6cd613 2826 case TMR_LUN_RESET:
c66ac9db
NB		 2827 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2828 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2829 TMR_FUNCTION_REJECTED;
2830 break;
5c6cd613 2831 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2832 tmr->response = TMR_FUNCTION_REJECTED;
2833 break;
5c6cd613 2834 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2835 tmr->response = TMR_FUNCTION_REJECTED;
2836 break;
c66ac9db 2837 default:
6708bb27 2838 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2839 tmr->function);
2840 tmr->response = TMR_FUNCTION_REJECTED;
2841 break;
2842 }
2843
2844 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2845 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2846
b7b8bef7 2847 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2848}
2849
af877292
CH		 2850int transport_generic_handle_tmr(
2851 struct se_cmd *cmd)
c66ac9db 2852{
af877292
CH		 2853 INIT_WORK(&cmd->work, target_tmr_work);
2854 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2855 return 0;
2856}
af877292 2857EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux kernel - Deliverables
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