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target: remove transport_generic_handle_cdb_map
[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 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
015487b8 40#include <linux/ratelimit.h>
c66ac9db
NB		 41#include <asm/unaligned.h>
42#include <net/sock.h>
43#include <net/tcp.h>
44#include <scsi/scsi.h>
45#include <scsi/scsi_cmnd.h>
e66ecd50 46#include <scsi/scsi_tcq.h>
c66ac9db
NB		 47
48#include <target/target_core_base.h>
c4795fb2
CH		 49#include <target/target_core_backend.h>
50#include <target/target_core_fabric.h>
c66ac9db
NB		 51#include <target/target_core_configfs.h>
52
e26d99ae 53#include "target_core_internal.h"
c66ac9db 54#include "target_core_alua.h"
c66ac9db 55#include "target_core_pr.h"
c66ac9db
NB		 56#include "target_core_ua.h"
57
e3d6f909 58static int sub_api_initialized;
c66ac9db 59
35e0e757 60static struct workqueue_struct *target_completion_wq;
c66ac9db 61static struct kmem_cache *se_sess_cache;
c66ac9db 62struct kmem_cache *se_ua_cache;
c66ac9db
NB		 63struct kmem_cache *t10_pr_reg_cache;
64struct kmem_cache *t10_alua_lu_gp_cache;
65struct kmem_cache *t10_alua_lu_gp_mem_cache;
66struct kmem_cache *t10_alua_tg_pt_gp_cache;
67struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
68
5951146d 69static int transport_processing_thread(void *param);
c66ac9db 70static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 71static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 72 struct se_device *dev);
05d1c7c0 73static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 74static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 75static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 76static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
35e0e757 77static void target_complete_ok_work(struct work_struct *work);
c66ac9db 78
e3d6f909 79int init_se_kmem_caches(void)
c66ac9db 80{
c66ac9db
NB		 81 se_sess_cache = kmem_cache_create("se_sess_cache",
82 sizeof(struct se_session), __alignof__(struct se_session),
83 0, NULL);
6708bb27
AG		 84 if (!se_sess_cache) {
85 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 86 " failed\n");
c8e31f26 87 goto out;
c66ac9db
NB		 88 }
89 se_ua_cache = kmem_cache_create("se_ua_cache",
90 sizeof(struct se_ua), __alignof__(struct se_ua),
91 0, NULL);
6708bb27
AG		 92 if (!se_ua_cache) {
93 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 94 goto out_free_sess_cache;
c66ac9db 95 }
c66ac9db
NB		 96 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
97 sizeof(struct t10_pr_registration),
98 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 99 if (!t10_pr_reg_cache) {
100 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 101 " failed\n");
35e0e757 102 goto out_free_ua_cache;
c66ac9db
NB		 103 }
104 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
105 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
106 0, NULL);
6708bb27
AG		 107 if (!t10_alua_lu_gp_cache) {
108 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 109 " failed\n");
35e0e757 110 goto out_free_pr_reg_cache;
c66ac9db
NB		 111 }
112 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
113 sizeof(struct t10_alua_lu_gp_member),
114 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 115 if (!t10_alua_lu_gp_mem_cache) {
116 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 117 "cache failed\n");
35e0e757 118 goto out_free_lu_gp_cache;
c66ac9db
NB		 119 }
120 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
121 sizeof(struct t10_alua_tg_pt_gp),
122 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 123 if (!t10_alua_tg_pt_gp_cache) {
124 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 125 "cache failed\n");
35e0e757 126 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 127 }
128 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
129 "t10_alua_tg_pt_gp_mem_cache",
130 sizeof(struct t10_alua_tg_pt_gp_member),
131 __alignof__(struct t10_alua_tg_pt_gp_member),
132 0, NULL);
6708bb27
AG		 133 if (!t10_alua_tg_pt_gp_mem_cache) {
134 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 135 "mem_t failed\n");
35e0e757 136 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 137 }
138
35e0e757
CH		 139 target_completion_wq = alloc_workqueue("target_completion",
140 WQ_MEM_RECLAIM, 0);
141 if (!target_completion_wq)
142 goto out_free_tg_pt_gp_mem_cache;
143
c66ac9db 144 return 0;
35e0e757
CH		 145
146out_free_tg_pt_gp_mem_cache:
147 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
148out_free_tg_pt_gp_cache:
149 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
150out_free_lu_gp_mem_cache:
151 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
152out_free_lu_gp_cache:
153 kmem_cache_destroy(t10_alua_lu_gp_cache);
154out_free_pr_reg_cache:
155 kmem_cache_destroy(t10_pr_reg_cache);
156out_free_ua_cache:
157 kmem_cache_destroy(se_ua_cache);
158out_free_sess_cache:
159 kmem_cache_destroy(se_sess_cache);
c66ac9db 160out:
e3d6f909 161 return -ENOMEM;
c66ac9db
NB		 162}
163
e3d6f909 164void release_se_kmem_caches(void)
c66ac9db 165{
35e0e757 166 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 167 kmem_cache_destroy(se_sess_cache);
168 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 169 kmem_cache_destroy(t10_pr_reg_cache);
170 kmem_cache_destroy(t10_alua_lu_gp_cache);
171 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
172 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
173 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 174}
175
e3d6f909
AG		 176/* This code ensures unique mib indexes are handed out. */
177static DEFINE_SPINLOCK(scsi_mib_index_lock);
178static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 179
180/*
181 * Allocate a new row index for the entry type specified
182 */
183u32 scsi_get_new_index(scsi_index_t type)
184{
185 u32 new_index;
186
e3d6f909 187 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 188
e3d6f909
AG		 189 spin_lock(&scsi_mib_index_lock);
190 new_index = ++scsi_mib_index[type];
191 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 192
193 return new_index;
194}
195
e26d99ae 196static void transport_init_queue_obj(struct se_queue_obj *qobj)
c66ac9db
NB		 197{
198 atomic_set(&qobj->queue_cnt, 0);
199 INIT_LIST_HEAD(&qobj->qobj_list);
200 init_waitqueue_head(&qobj->thread_wq);
201 spin_lock_init(&qobj->cmd_queue_lock);
202}
c66ac9db 203
dbc5623e 204void transport_subsystem_check_init(void)
c66ac9db
NB		 205{
206 int ret;
207
dbc5623e
NB		 208 if (sub_api_initialized)
209 return;
210
c66ac9db
NB		 211 ret = request_module("target_core_iblock");
212 if (ret != 0)
6708bb27 213 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 214
215 ret = request_module("target_core_file");
216 if (ret != 0)
6708bb27 217 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 218
219 ret = request_module("target_core_pscsi");
220 if (ret != 0)
6708bb27 221 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 222
223 ret = request_module("target_core_stgt");
224 if (ret != 0)
6708bb27 225 pr_err("Unable to load target_core_stgt\n");
c66ac9db 226
e3d6f909 227 sub_api_initialized = 1;
dbc5623e 228 return;
c66ac9db
NB		 229}
230
231struct se_session *transport_init_session(void)
232{
233 struct se_session *se_sess;
234
235 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 236 if (!se_sess) {
237 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 238 " se_sess_cache\n");
239 return ERR_PTR(-ENOMEM);
240 }
241 INIT_LIST_HEAD(&se_sess->sess_list);
242 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d
NB		 243 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
244 INIT_LIST_HEAD(&se_sess->sess_wait_list);
245 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 246 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 247
248 return se_sess;
249}
250EXPORT_SYMBOL(transport_init_session);
251
252/*
140854cb 253 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 254 */
255void __transport_register_session(
256 struct se_portal_group *se_tpg,
257 struct se_node_acl *se_nacl,
258 struct se_session *se_sess,
259 void *fabric_sess_ptr)
260{
261 unsigned char buf[PR_REG_ISID_LEN];
262
263 se_sess->se_tpg = se_tpg;
264 se_sess->fabric_sess_ptr = fabric_sess_ptr;
265 /*
266 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
267 *
268 * Only set for struct se_session's that will actually be moving I/O.
269 * eg: *NOT* discovery sessions.
270 */
271 if (se_nacl) {
272 /*
273 * If the fabric module supports an ISID based TransportID,
274 * save this value in binary from the fabric I_T Nexus now.
275 */
e3d6f909 276 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 277 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 278 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 279 &buf[0], PR_REG_ISID_LEN);
280 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
281 }
afb999ff
NB		 282 kref_get(&se_nacl->acl_kref);
283
c66ac9db
NB		 284 spin_lock_irq(&se_nacl->nacl_sess_lock);
285 /*
286 * The se_nacl->nacl_sess pointer will be set to the
287 * last active I_T Nexus for each struct se_node_acl.
288 */
289 se_nacl->nacl_sess = se_sess;
290
291 list_add_tail(&se_sess->sess_acl_list,
292 &se_nacl->acl_sess_list);
293 spin_unlock_irq(&se_nacl->nacl_sess_lock);
294 }
295 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
296
6708bb27 297 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 298 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 299}
300EXPORT_SYMBOL(__transport_register_session);
301
302void transport_register_session(
303 struct se_portal_group *se_tpg,
304 struct se_node_acl *se_nacl,
305 struct se_session *se_sess,
306 void *fabric_sess_ptr)
307{
140854cb
NB		 308 unsigned long flags;
309
310 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 311 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 312 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 313}
314EXPORT_SYMBOL(transport_register_session);
315
4149268e 316void target_release_session(struct kref *kref)
41ac82b6
NB		 317{
318 struct se_session *se_sess = container_of(kref,
319 struct se_session, sess_kref);
320 struct se_portal_group *se_tpg = se_sess->se_tpg;
321
322 se_tpg->se_tpg_tfo->close_session(se_sess);
323}
324
325void target_get_session(struct se_session *se_sess)
326{
327 kref_get(&se_sess->sess_kref);
328}
329EXPORT_SYMBOL(target_get_session);
330
33933a0e 331void target_put_session(struct se_session *se_sess)
41ac82b6 332{
4149268e
JE		 333 struct se_portal_group *tpg = se_sess->se_tpg;
334
335 if (tpg->se_tpg_tfo->put_session != NULL) {
336 tpg->se_tpg_tfo->put_session(se_sess);
337 return;
338 }
33933a0e 339 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 340}
341EXPORT_SYMBOL(target_put_session);
342
afb999ff
NB		 343static void target_complete_nacl(struct kref *kref)
344{
345 struct se_node_acl *nacl = container_of(kref,
346 struct se_node_acl, acl_kref);
347
348 complete(&nacl->acl_free_comp);
349}
350
351void target_put_nacl(struct se_node_acl *nacl)
352{
353 kref_put(&nacl->acl_kref, target_complete_nacl);
354}
355
c66ac9db
NB		 356void transport_deregister_session_configfs(struct se_session *se_sess)
357{
358 struct se_node_acl *se_nacl;
23388864 359 unsigned long flags;
c66ac9db
NB		 360 /*
361 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
362 */
363 se_nacl = se_sess->se_node_acl;
6708bb27 364 if (se_nacl) {
23388864 365 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 366 if (se_nacl->acl_stop == 0)
367 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 368 /*
369 * If the session list is empty, then clear the pointer.
370 * Otherwise, set the struct se_session pointer from the tail
371 * element of the per struct se_node_acl active session list.
372 */
373 if (list_empty(&se_nacl->acl_sess_list))
374 se_nacl->nacl_sess = NULL;
375 else {
376 se_nacl->nacl_sess = container_of(
377 se_nacl->acl_sess_list.prev,
378 struct se_session, sess_acl_list);
379 }
23388864 380 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 381 }
382}
383EXPORT_SYMBOL(transport_deregister_session_configfs);
384
385void transport_free_session(struct se_session *se_sess)
386{
387 kmem_cache_free(se_sess_cache, se_sess);
388}
389EXPORT_SYMBOL(transport_free_session);
390
391void transport_deregister_session(struct se_session *se_sess)
392{
393 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 394 struct target_core_fabric_ops *se_tfo;
c66ac9db 395 struct se_node_acl *se_nacl;
e63a8e19 396 unsigned long flags;
01468346 397 bool comp_nacl = true;
c66ac9db 398
6708bb27 399 if (!se_tpg) {
c66ac9db
NB		 400 transport_free_session(se_sess);
401 return;
402 }
01468346 403 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 404
e63a8e19 405 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 406 list_del(&se_sess->sess_list);
407 se_sess->se_tpg = NULL;
408 se_sess->fabric_sess_ptr = NULL;
e63a8e19 409 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 410
411 /*
412 * Determine if we need to do extra work for this initiator node's
413 * struct se_node_acl if it had been previously dynamically generated.
414 */
415 se_nacl = se_sess->se_node_acl;
01468346
NB		 416
417 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
418 if (se_nacl && se_nacl->dynamic_node_acl) {
419 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
420 list_del(&se_nacl->acl_list);
421 se_tpg->num_node_acls--;
422 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
423 core_tpg_wait_for_nacl_pr_ref(se_nacl);
424 core_free_device_list_for_node(se_nacl, se_tpg);
425 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
426
427 comp_nacl = false;
428 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 429 }
c66ac9db 430 }
01468346 431 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 432
6708bb27 433 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 434 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 435 /*
afb999ff
NB		 436 * If last kref is dropping now for an explict NodeACL, awake sleeping
437 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
438 * removal context.
01468346
NB		 439 */
440 if (se_nacl && comp_nacl == true)
afb999ff 441 target_put_nacl(se_nacl);
01468346 442
afb999ff 443 transport_free_session(se_sess);
c66ac9db
NB		 444}
445EXPORT_SYMBOL(transport_deregister_session);
446
447/*
a1d8b49a 448 * Called with cmd->t_state_lock held.
c66ac9db 449 */
cf572a96 450static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 451{
42bf829e 452 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 453 unsigned long flags;
454
42bf829e
CH		 455 if (!dev)
456 return;
c66ac9db 457
cf572a96
CH		 458 if (cmd->transport_state & CMD_T_BUSY)
459 return;
c66ac9db 460
cf572a96
CH		 461 spin_lock_irqsave(&dev->execute_task_lock, flags);
462 if (cmd->state_active) {
463 list_del(&cmd->state_list);
cf572a96 464 cmd->state_active = false;
c66ac9db 465 }
cf572a96 466 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 467}
468
f7113a47 469static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
c66ac9db
NB		 470{
471 unsigned long flags;
472
a1d8b49a 473 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 474 /*
475 * Determine if IOCTL context caller in requesting the stopping of this
476 * command for LUN shutdown purposes.
477 */
7d680f3b
CH		 478 if (cmd->transport_state & CMD_T_LUN_STOP) {
479 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
480 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 481
7d680f3b 482 cmd->transport_state &= ~CMD_T_ACTIVE;
f7113a47 483 if (remove_from_lists)
cf572a96 484 target_remove_from_state_list(cmd);
a1d8b49a 485 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 486
a1d8b49a 487 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 488 return 1;
489 }
f7113a47
CH		 490
491 if (remove_from_lists) {
492 target_remove_from_state_list(cmd);
493
494 /*
495 * Clear struct se_cmd->se_lun before the handoff to FE.
496 */
497 cmd->se_lun = NULL;
498 }
499
c66ac9db
NB		 500 /*
501 * Determine if frontend context caller is requesting the stopping of
e3d6f909 502 * this command for frontend exceptions.
c66ac9db 503 */
7d680f3b
CH		 504 if (cmd->transport_state & CMD_T_STOP) {
505 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
506 __func__, __LINE__,
e3d6f909 507 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 508
a1d8b49a 509 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 510
a1d8b49a 511 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 512 return 1;
513 }
f7113a47
CH		 514
515 cmd->transport_state &= ~CMD_T_ACTIVE;
516 if (remove_from_lists) {
517 /*
518 * Some fabric modules like tcm_loop can release
519 * their internally allocated I/O reference now and
520 * struct se_cmd now.
521 *
522 * Fabric modules are expected to return '1' here if the
523 * se_cmd being passed is released at this point,
524 * or zero if not being released.
525 */
526 if (cmd->se_tfo->check_stop_free != NULL) {
527 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
528 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 529 }
f7113a47 530 }
c66ac9db 531
a1d8b49a 532 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 533 return 0;
534}
535
536static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
537{
f7113a47 538 return transport_cmd_check_stop(cmd, true);
c66ac9db
NB		 539}
540
541static void transport_lun_remove_cmd(struct se_cmd *cmd)
542{
e3d6f909 543 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 544 unsigned long flags;
545
546 if (!lun)
547 return;
548
a1d8b49a 549 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 550 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
551 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 552 target_remove_from_state_list(cmd);
c66ac9db 553 }
a1d8b49a 554 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 555
c66ac9db 556 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 557 if (!list_empty(&cmd->se_lun_node))
558 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 559 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
560}
561
562void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
563{
c8e31f26 564 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
8dc52b54 565 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 566
567 if (transport_cmd_check_stop_to_fabric(cmd))
568 return;
77039d1e 569 if (remove) {
3df8d40b 570 transport_remove_cmd_from_queue(cmd);
e6a2573f 571 transport_put_cmd(cmd);
77039d1e 572 }
c66ac9db
NB		 573}
574
f7a5cc0b
CH		 575static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
576 bool at_head)
c66ac9db
NB		 577{
578 struct se_device *dev = cmd->se_dev;
e3d6f909 579 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 580 unsigned long flags;
581
c66ac9db 582 if (t_state) {
a1d8b49a 583 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 584 cmd->t_state = t_state;
7d680f3b 585 cmd->transport_state |= CMD_T_ACTIVE;
a1d8b49a 586 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 587 }
588
589 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 590
591 /* If the cmd is already on the list, remove it before we add it */
592 if (!list_empty(&cmd->se_queue_node))
593 list_del(&cmd->se_queue_node);
594 else
595 atomic_inc(&qobj->queue_cnt);
596
f7a5cc0b 597 if (at_head)
07bde79a 598 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 599 else
07bde79a 600 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
7d680f3b 601 cmd->transport_state |= CMD_T_QUEUED;
c66ac9db
NB		 602 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
603
c66ac9db 604 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 605}
606
5951146d
AG		 607static struct se_cmd *
608transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 609{
5951146d 610 struct se_cmd *cmd;
c66ac9db
NB		 611 unsigned long flags;
612
613 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
614 if (list_empty(&qobj->qobj_list)) {
615 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
616 return NULL;
617 }
5951146d 618 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 619
7d680f3b 620 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2 621 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 622 atomic_dec(&qobj->queue_cnt);
623 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
624
5951146d 625 return cmd;
c66ac9db
NB		 626}
627
3df8d40b 628static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 629{
3df8d40b 630 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 631 unsigned long flags;
632
633 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
7d680f3b 634 if (!(cmd->transport_state & CMD_T_QUEUED)) {
c66ac9db
NB		 635 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
636 return;
637 }
7d680f3b 638 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2
RD		 639 atomic_dec(&qobj->queue_cnt);
640 list_del_init(&cmd->se_queue_node);
c66ac9db 641 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
c66ac9db
NB		 642}
643
35e0e757
CH		 644static void target_complete_failure_work(struct work_struct *work)
645{
646 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
647
03e98c9e 648 transport_generic_request_failure(cmd);
35e0e757
CH		 649}
650
5787cacd 651void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 652{
42bf829e 653 struct se_device *dev = cmd->se_dev;
5787cacd 654 int success = scsi_status == GOOD;
c66ac9db 655 unsigned long flags;
c66ac9db 656
5787cacd
CH		 657 cmd->scsi_status = scsi_status;
658
659
a1d8b49a 660 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 661 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 662
c66ac9db 663 if (dev && dev->transport->transport_complete) {
5787cacd
CH		 664 if (dev->transport->transport_complete(cmd,
665 cmd->t_data_sg) != 0) {
c66ac9db 666 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
c66ac9db
NB		 667 success = 1;
668 }
669 }
670
671 /*
5787cacd 672 * See if we are waiting to complete for an exception condition.
c66ac9db 673 */
cf572a96 674 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 675 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 676 complete(&cmd->task_stop_comp);
c66ac9db
NB		 677 return;
678 }
2235007c
CH		 679
680 if (!success)
7d680f3b 681 cmd->transport_state |= CMD_T_FAILED;
2235007c 682
3d28934a
NB		 683 /*
684 * Check for case where an explict ABORT_TASK has been received
685 * and transport_wait_for_tasks() will be waiting for completion..
686 */
687 if (cmd->transport_state & CMD_T_ABORTED &&
688 cmd->transport_state & CMD_T_STOP) {
689 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
690 complete(&cmd->t_transport_stop_comp);
691 return;
692 } else if (cmd->transport_state & CMD_T_FAILED) {
41e16e98 693 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 694 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 695 } else {
35e0e757 696 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 697 }
35e0e757 698
35e0e757 699 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 700 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 701 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 702
35e0e757 703 queue_work(target_completion_wq, &cmd->work);
c66ac9db 704}
6bb35e00
CH		 705EXPORT_SYMBOL(target_complete_cmd);
706
cf572a96 707static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 708{
cf572a96
CH		 709 struct se_device *dev = cmd->se_dev;
710 unsigned long flags;
c66ac9db 711
cf572a96
CH		 712 spin_lock_irqsave(&dev->execute_task_lock, flags);
713 if (!cmd->state_active) {
714 list_add_tail(&cmd->state_list, &dev->state_list);
715 cmd->state_active = true;
c66ac9db 716 }
cf572a96 717 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 718}
719
07bde79a 720/*
f147abb4 721 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 722 */
7a6f0a1e
CH		 723static void transport_write_pending_qf(struct se_cmd *cmd);
724static void transport_complete_qf(struct se_cmd *cmd);
07bde79a
NB		 725
726static void target_qf_do_work(struct work_struct *work)
727{
728 struct se_device *dev = container_of(work, struct se_device,
729 qf_work_queue);
bcac364a 730 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 731 struct se_cmd *cmd, *cmd_tmp;
732
733 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 734 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
735 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 736
bcac364a 737 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 738 list_del(&cmd->se_qf_node);
739 atomic_dec(&dev->dev_qf_count);
740 smp_mb__after_atomic_dec();
07bde79a 741
6708bb27 742 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 743 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 744 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 745 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
746 : "UNKNOWN");
f7a5cc0b 747
7a6f0a1e
CH		 748 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
749 transport_write_pending_qf(cmd);
750 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
751 transport_complete_qf(cmd);
07bde79a 752 }
07bde79a
NB		 753}
754
c66ac9db
NB		 755unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
756{
757 switch (cmd->data_direction) {
758 case DMA_NONE:
759 return "NONE";
760 case DMA_FROM_DEVICE:
761 return "READ";
762 case DMA_TO_DEVICE:
763 return "WRITE";
764 case DMA_BIDIRECTIONAL:
765 return "BIDI";
766 default:
767 break;
768 }
769
770 return "UNKNOWN";
771}
772
773void transport_dump_dev_state(
774 struct se_device *dev,
775 char *b,
776 int *bl)
777{
778 *bl += sprintf(b + *bl, "Status: ");
779 switch (dev->dev_status) {
780 case TRANSPORT_DEVICE_ACTIVATED:
781 *bl += sprintf(b + *bl, "ACTIVATED");
782 break;
783 case TRANSPORT_DEVICE_DEACTIVATED:
784 *bl += sprintf(b + *bl, "DEACTIVATED");
785 break;
786 case TRANSPORT_DEVICE_SHUTDOWN:
787 *bl += sprintf(b + *bl, "SHUTDOWN");
788 break;
789 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
790 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
791 *bl += sprintf(b + *bl, "OFFLINE");
792 break;
793 default:
794 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
795 break;
796 }
797
5f41a31d 798 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd
NB		 799 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
800 dev->se_sub_dev->se_dev_attrib.block_size,
801 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
c66ac9db
NB		 802 *bl += sprintf(b + *bl, " ");
803}
804
c66ac9db
NB		 805void transport_dump_vpd_proto_id(
806 struct t10_vpd *vpd,
807 unsigned char *p_buf,
808 int p_buf_len)
809{
810 unsigned char buf[VPD_TMP_BUF_SIZE];
811 int len;
812
813 memset(buf, 0, VPD_TMP_BUF_SIZE);
814 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
815
816 switch (vpd->protocol_identifier) {
817 case 0x00:
818 sprintf(buf+len, "Fibre Channel\n");
819 break;
820 case 0x10:
821 sprintf(buf+len, "Parallel SCSI\n");
822 break;
823 case 0x20:
824 sprintf(buf+len, "SSA\n");
825 break;
826 case 0x30:
827 sprintf(buf+len, "IEEE 1394\n");
828 break;
829 case 0x40:
830 sprintf(buf+len, "SCSI Remote Direct Memory Access"
831 " Protocol\n");
832 break;
833 case 0x50:
834 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
835 break;
836 case 0x60:
837 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
838 break;
839 case 0x70:
840 sprintf(buf+len, "Automation/Drive Interface Transport"
841 " Protocol\n");
842 break;
843 case 0x80:
844 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
845 break;
846 default:
847 sprintf(buf+len, "Unknown 0x%02x\n",
848 vpd->protocol_identifier);
849 break;
850 }
851
852 if (p_buf)
853 strncpy(p_buf, buf, p_buf_len);
854 else
6708bb27 855 pr_debug("%s", buf);
c66ac9db
NB		 856}
857
858void
859transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
860{
861 /*
862 * Check if the Protocol Identifier Valid (PIV) bit is set..
863 *
864 * from spc3r23.pdf section 7.5.1
865 */
866 if (page_83[1] & 0x80) {
867 vpd->protocol_identifier = (page_83[0] & 0xf0);
868 vpd->protocol_identifier_set = 1;
869 transport_dump_vpd_proto_id(vpd, NULL, 0);
870 }
871}
872EXPORT_SYMBOL(transport_set_vpd_proto_id);
873
874int transport_dump_vpd_assoc(
875 struct t10_vpd *vpd,
876 unsigned char *p_buf,
877 int p_buf_len)
878{
879 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 880 int ret = 0;
881 int len;
c66ac9db
NB		 882
883 memset(buf, 0, VPD_TMP_BUF_SIZE);
884 len = sprintf(buf, "T10 VPD Identifier Association: ");
885
886 switch (vpd->association) {
887 case 0x00:
888 sprintf(buf+len, "addressed logical unit\n");
889 break;
890 case 0x10:
891 sprintf(buf+len, "target port\n");
892 break;
893 case 0x20:
894 sprintf(buf+len, "SCSI target device\n");
895 break;
896 default:
897 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 898 ret = -EINVAL;
c66ac9db
NB		 899 break;
900 }
901
902 if (p_buf)
903 strncpy(p_buf, buf, p_buf_len);
904 else
6708bb27 905 pr_debug("%s", buf);
c66ac9db
NB		 906
907 return ret;
908}
909
910int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
911{
912 /*
913 * The VPD identification association..
914 *
915 * from spc3r23.pdf Section 7.6.3.1 Table 297
916 */
917 vpd->association = (page_83[1] & 0x30);
918 return transport_dump_vpd_assoc(vpd, NULL, 0);
919}
920EXPORT_SYMBOL(transport_set_vpd_assoc);
921
922int transport_dump_vpd_ident_type(
923 struct t10_vpd *vpd,
924 unsigned char *p_buf,
925 int p_buf_len)
926{
927 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 928 int ret = 0;
929 int len;
c66ac9db
NB		 930
931 memset(buf, 0, VPD_TMP_BUF_SIZE);
932 len = sprintf(buf, "T10 VPD Identifier Type: ");
933
934 switch (vpd->device_identifier_type) {
935 case 0x00:
936 sprintf(buf+len, "Vendor specific\n");
937 break;
938 case 0x01:
939 sprintf(buf+len, "T10 Vendor ID based\n");
940 break;
941 case 0x02:
942 sprintf(buf+len, "EUI-64 based\n");
943 break;
944 case 0x03:
945 sprintf(buf+len, "NAA\n");
946 break;
947 case 0x04:
948 sprintf(buf+len, "Relative target port identifier\n");
949 break;
950 case 0x08:
951 sprintf(buf+len, "SCSI name string\n");
952 break;
953 default:
954 sprintf(buf+len, "Unsupported: 0x%02x\n",
955 vpd->device_identifier_type);
e3d6f909 956 ret = -EINVAL;
c66ac9db
NB		 957 break;
958 }
959
e3d6f909
AG		 960 if (p_buf) {
961 if (p_buf_len < strlen(buf)+1)
962 return -EINVAL;
c66ac9db 963 strncpy(p_buf, buf, p_buf_len);
e3d6f909 964 } else {
6708bb27 965 pr_debug("%s", buf);
e3d6f909 966 }
c66ac9db
NB		 967
968 return ret;
969}
970
971int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
972{
973 /*
974 * The VPD identifier type..
975 *
976 * from spc3r23.pdf Section 7.6.3.1 Table 298
977 */
978 vpd->device_identifier_type = (page_83[1] & 0x0f);
979 return transport_dump_vpd_ident_type(vpd, NULL, 0);
980}
981EXPORT_SYMBOL(transport_set_vpd_ident_type);
982
983int transport_dump_vpd_ident(
984 struct t10_vpd *vpd,
985 unsigned char *p_buf,
986 int p_buf_len)
987{
988 unsigned char buf[VPD_TMP_BUF_SIZE];
989 int ret = 0;
990
991 memset(buf, 0, VPD_TMP_BUF_SIZE);
992
993 switch (vpd->device_identifier_code_set) {
994 case 0x01: /* Binary */
995 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
996 &vpd->device_identifier[0]);
997 break;
998 case 0x02: /* ASCII */
999 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1000 &vpd->device_identifier[0]);
1001 break;
1002 case 0x03: /* UTF-8 */
1003 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1004 &vpd->device_identifier[0]);
1005 break;
1006 default:
1007 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1008 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1009 ret = -EINVAL;
c66ac9db
NB		 1010 break;
1011 }
1012
1013 if (p_buf)
1014 strncpy(p_buf, buf, p_buf_len);
1015 else
6708bb27 1016 pr_debug("%s", buf);
c66ac9db
NB		 1017
1018 return ret;
1019}
1020
1021int
1022transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1023{
1024 static const char hex_str[] = "0123456789abcdef";
1025 int j = 0, i = 4; /* offset to start of the identifer */
1026
1027 /*
1028 * The VPD Code Set (encoding)
1029 *
1030 * from spc3r23.pdf Section 7.6.3.1 Table 296
1031 */
1032 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1033 switch (vpd->device_identifier_code_set) {
1034 case 0x01: /* Binary */
1035 vpd->device_identifier[j++] =
1036 hex_str[vpd->device_identifier_type];
1037 while (i < (4 + page_83[3])) {
1038 vpd->device_identifier[j++] =
1039 hex_str[(page_83[i] & 0xf0) >> 4];
1040 vpd->device_identifier[j++] =
1041 hex_str[page_83[i] & 0x0f];
1042 i++;
1043 }
1044 break;
1045 case 0x02: /* ASCII */
1046 case 0x03: /* UTF-8 */
1047 while (i < (4 + page_83[3]))
1048 vpd->device_identifier[j++] = page_83[i++];
1049 break;
1050 default:
1051 break;
1052 }
1053
1054 return transport_dump_vpd_ident(vpd, NULL, 0);
1055}
1056EXPORT_SYMBOL(transport_set_vpd_ident);
1057
1058static void core_setup_task_attr_emulation(struct se_device *dev)
1059{
1060 /*
1061 * If this device is from Target_Core_Mod/pSCSI, disable the
1062 * SAM Task Attribute emulation.
1063 *
1064 * This is currently not available in upsream Linux/SCSI Target
1065 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1066 */
e3d6f909 1067 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1068 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1069 return;
1070 }
1071
1072 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1073 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1074 " device\n", dev->transport->name,
1075 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1076}
1077
1078static void scsi_dump_inquiry(struct se_device *dev)
1079{
e3d6f909 1080 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1081 char buf[17];
c66ac9db
NB		 1082 int i, device_type;
1083 /*
1084 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1085 */
c66ac9db
NB		 1086 for (i = 0; i < 8; i++)
1087 if (wwn->vendor[i] >= 0x20)
e59a41b6 1088 buf[i] = wwn->vendor[i];
c66ac9db 1089 else
e59a41b6
SAS		 1090 buf[i] = ' ';
1091 buf[i] = '\0';
1092 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1093
c66ac9db
NB		 1094 for (i = 0; i < 16; i++)
1095 if (wwn->model[i] >= 0x20)
e59a41b6 1096 buf[i] = wwn->model[i];
c66ac9db 1097 else
e59a41b6
SAS		 1098 buf[i] = ' ';
1099 buf[i] = '\0';
1100 pr_debug(" Model: %s\n", buf);
c66ac9db 1101
c66ac9db
NB		 1102 for (i = 0; i < 4; i++)
1103 if (wwn->revision[i] >= 0x20)
e59a41b6 1104 buf[i] = wwn->revision[i];
c66ac9db 1105 else
e59a41b6
SAS		 1106 buf[i] = ' ';
1107 buf[i] = '\0';
1108 pr_debug(" Revision: %s\n", buf);
c66ac9db 1109
e3d6f909 1110 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1111 pr_debug(" Type: %s ", scsi_device_type(device_type));
1112 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1113 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1114}
1115
1116struct se_device *transport_add_device_to_core_hba(
1117 struct se_hba *hba,
1118 struct se_subsystem_api *transport,
1119 struct se_subsystem_dev *se_dev,
1120 u32 device_flags,
1121 void *transport_dev,
1122 struct se_dev_limits *dev_limits,
1123 const char *inquiry_prod,
1124 const char *inquiry_rev)
1125{
12a18bdc 1126 int force_pt;
c66ac9db
NB		 1127 struct se_device *dev;
1128
1129 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1130 if (!dev) {
1131 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1132 return NULL;
1133 }
c66ac9db 1134
e3d6f909 1135 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1136 dev->dev_flags = device_flags;
1137 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1138 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1139 dev->se_hba = hba;
1140 dev->se_sub_dev = se_dev;
1141 dev->transport = transport;
c66ac9db
NB		 1142 INIT_LIST_HEAD(&dev->dev_list);
1143 INIT_LIST_HEAD(&dev->dev_sep_list);
1144 INIT_LIST_HEAD(&dev->dev_tmr_list);
c66ac9db 1145 INIT_LIST_HEAD(&dev->delayed_cmd_list);
cf572a96 1146 INIT_LIST_HEAD(&dev->state_list);
07bde79a 1147 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1148 spin_lock_init(&dev->execute_task_lock);
1149 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1150 spin_lock_init(&dev->dev_reservation_lock);
1151 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1152 spin_lock_init(&dev->se_port_lock);
1153 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1154 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1155 atomic_set(&dev->dev_ordered_id, 0);
1156
1157 se_dev_set_default_attribs(dev, dev_limits);
1158
1159 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1160 dev->creation_time = get_jiffies_64();
1161 spin_lock_init(&dev->stats_lock);
1162
1163 spin_lock(&hba->device_lock);
1164 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1165 hba->dev_count++;
1166 spin_unlock(&hba->device_lock);
1167 /*
1168 * Setup the SAM Task Attribute emulation for struct se_device
1169 */
1170 core_setup_task_attr_emulation(dev);
1171 /*
1172 * Force PR and ALUA passthrough emulation with internal object use.
1173 */
1174 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1175 /*
1176 * Setup the Reservations infrastructure for struct se_device
1177 */
1178 core_setup_reservations(dev, force_pt);
1179 /*
1180 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1181 */
1182 if (core_setup_alua(dev, force_pt) < 0)
1183 goto out;
1184
1185 /*
1186 * Startup the struct se_device processing thread
1187 */
1188 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1189 "LIO_%s", dev->transport->name);
c66ac9db 1190 if (IS_ERR(dev->process_thread)) {
6708bb27 1191 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1192 dev->transport->name);
c66ac9db
NB		 1193 goto out;
1194 }
07bde79a
NB		 1195 /*
1196 * Setup work_queue for QUEUE_FULL
1197 */
1198 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1199 /*
1200 * Preload the initial INQUIRY const values if we are doing
1201 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1202 * passthrough because this is being provided by the backend LLD.
1203 * This is required so that transport_get_inquiry() copies these
1204 * originals once back into DEV_T10_WWN(dev) for the virtual device
1205 * setup.
1206 */
e3d6f909 1207 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1208 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1209 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1210 " INQUIRY consts\n");
1211 goto out;
1212 }
1213
e3d6f909
AG		 1214 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1215 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1216 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1217 }
1218 scsi_dump_inquiry(dev);
1219
12a18bdc 1220 return dev;
c66ac9db 1221out:
c66ac9db
NB		 1222 kthread_stop(dev->process_thread);
1223
1224 spin_lock(&hba->device_lock);
1225 list_del(&dev->dev_list);
1226 hba->dev_count--;
1227 spin_unlock(&hba->device_lock);
1228
1229 se_release_vpd_for_dev(dev);
1230
c66ac9db
NB		 1231 kfree(dev);
1232
1233 return NULL;
1234}
1235EXPORT_SYMBOL(transport_add_device_to_core_hba);
1236
1fd032ee 1237int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1238{
1239 struct se_device *dev = cmd->se_dev;
1240
1241 if (cmd->unknown_data_length) {
1242 cmd->data_length = size;
1243 } else if (size != cmd->data_length) {
1244 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1245 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1246 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1247 cmd->data_length, size, cmd->t_task_cdb[0]);
1248
1249 cmd->cmd_spdtl = size;
1250
1251 if (cmd->data_direction == DMA_TO_DEVICE) {
1252 pr_err("Rejecting underflow/overflow"
1253 " WRITE data\n");
1254 goto out_invalid_cdb_field;
1255 }
1256 /*
1257 * Reject READ_* or WRITE_* with overflow/underflow for
1258 * type SCF_SCSI_DATA_CDB.
1259 */
1260 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
1261 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1262 " CDB on non 512-byte sector setup subsystem"
1263 " plugin: %s\n", dev->transport->name);
1264 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1265 goto out_invalid_cdb_field;
1266 }
1267
1268 if (size > cmd->data_length) {
1269 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1270 cmd->residual_count = (size - cmd->data_length);
1271 } else {
1272 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1273 cmd->residual_count = (cmd->data_length - size);
1274 }
1275 cmd->data_length = size;
1276 }
1277
1278 return 0;
1279
1280out_invalid_cdb_field:
1281 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1282 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1283 return -EINVAL;
1284}
1285
c66ac9db
NB		 1286/*
1287 * Used by fabric modules containing a local struct se_cmd within their
1288 * fabric dependent per I/O descriptor.
1289 */
1290void transport_init_se_cmd(
1291 struct se_cmd *cmd,
1292 struct target_core_fabric_ops *tfo,
1293 struct se_session *se_sess,
1294 u32 data_length,
1295 int data_direction,
1296 int task_attr,
1297 unsigned char *sense_buffer)
1298{
5951146d
AG		 1299 INIT_LIST_HEAD(&cmd->se_lun_node);
1300 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1301 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1302 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1303 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1304 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1305 init_completion(&cmd->transport_lun_fe_stop_comp);
1306 init_completion(&cmd->transport_lun_stop_comp);
1307 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1308 init_completion(&cmd->cmd_wait_comp);
cf572a96 1309 init_completion(&cmd->task_stop_comp);
a1d8b49a 1310 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1311 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1312
1313 cmd->se_tfo = tfo;
1314 cmd->se_sess = se_sess;
1315 cmd->data_length = data_length;
1316 cmd->data_direction = data_direction;
1317 cmd->sam_task_attr = task_attr;
1318 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1319
1320 cmd->state_active = false;
c66ac9db
NB		 1321}
1322EXPORT_SYMBOL(transport_init_se_cmd);
1323
1324static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1325{
1326 /*
1327 * Check if SAM Task Attribute emulation is enabled for this
1328 * struct se_device storage object
1329 */
5951146d 1330 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1331 return 0;
1332
e66ecd50 1333 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1334 pr_debug("SAM Task Attribute ACA"
c66ac9db 1335 " emulation is not supported\n");
e3d6f909 1336 return -EINVAL;
c66ac9db
NB		 1337 }
1338 /*
1339 * Used to determine when ORDERED commands should go from
1340 * Dormant to Active status.
1341 */
5951146d 1342 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1343 smp_mb__after_atomic_inc();
6708bb27 1344 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1345 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1346 cmd->se_dev->transport->name);
c66ac9db
NB		 1347 return 0;
1348}
1349
a12f41f8 1350/* target_setup_cmd_from_cdb():
c66ac9db
NB		 1351 *
1352 * Called from fabric RX Thread.
1353 */
a12f41f8 1354int target_setup_cmd_from_cdb(
c66ac9db
NB		 1355 struct se_cmd *cmd,
1356 unsigned char *cdb)
1357{
cb4f4d3c
CH		 1358 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1359 u32 pr_reg_type = 0;
1360 u8 alua_ascq = 0;
1361 unsigned long flags;
c66ac9db
NB		 1362 int ret;
1363
c66ac9db
NB		 1364 /*
1365 * Ensure that the received CDB is less than the max (252 + 8) bytes
1366 * for VARIABLE_LENGTH_CMD
1367 */
1368 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1369 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1370 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1371 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1372 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1373 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1374 return -EINVAL;
c66ac9db
NB		 1375 }
1376 /*
1377 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1378 * allocate the additional extended CDB buffer now.. Otherwise
1379 * setup the pointer from __t_task_cdb to t_task_cdb.
1380 */
a1d8b49a
AG		 1381 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1382 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1383 GFP_KERNEL);
6708bb27
AG		 1384 if (!cmd->t_task_cdb) {
1385 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1386 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1387 scsi_command_size(cdb),
a1d8b49a 1388 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1389 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1390 cmd->scsi_sense_reason =
1391 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1392 return -ENOMEM;
c66ac9db
NB		 1393 }
1394 } else
a1d8b49a 1395 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1396 /*
a1d8b49a 1397 * Copy the original CDB into cmd->
c66ac9db 1398 */
a1d8b49a 1399 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c
CH		 1400
1401 /*
1402 * Check for an existing UNIT ATTENTION condition
1403 */
1404 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1405 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1406 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1407 return -EINVAL;
1408 }
1409
1410 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1411 if (ret != 0) {
1412 /*
1413 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1414 * The ALUA additional sense code qualifier (ASCQ) is determined
1415 * by the ALUA primary or secondary access state..
1416 */
1417 if (ret > 0) {
1418 pr_debug("[%s]: ALUA TG Port not available, "
1419 "SenseKey: NOT_READY, ASC/ASCQ: "
1420 "0x04/0x%02x\n",
1421 cmd->se_tfo->get_fabric_name(), alua_ascq);
1422
1423 transport_set_sense_codes(cmd, 0x04, alua_ascq);
1424 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1425 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1426 return -EINVAL;
1427 }
1428 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1429 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1430 return -EINVAL;
1431 }
1432
1433 /*
1434 * Check status for SPC-3 Persistent Reservations
1435 */
1436 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1437 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1438 cmd, cdb, pr_reg_type) != 0) {
1439 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1440 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1441 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1442 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1443 return -EBUSY;
1444 }
1445 /*
1446 * This means the CDB is allowed for the SCSI Initiator port
1447 * when said port is *NOT* holding the legacy SPC-2 or
1448 * SPC-3 Persistent Reservation.
1449 */
1450 }
1451
1fd032ee 1452 ret = cmd->se_dev->transport->parse_cdb(cmd);
c66ac9db
NB		 1453 if (ret < 0)
1454 return ret;
cb4f4d3c
CH		 1455
1456 spin_lock_irqsave(&cmd->t_state_lock, flags);
1457 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1458 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1459
c66ac9db
NB		 1460 /*
1461 * Check for SAM Task Attribute Emulation
1462 */
1463 if (transport_check_alloc_task_attr(cmd) < 0) {
1464 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1465 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1466 return -EINVAL;
c66ac9db
NB		 1467 }
1468 spin_lock(&cmd->se_lun->lun_sep_lock);
1469 if (cmd->se_lun->lun_sep)
1470 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1471 spin_unlock(&cmd->se_lun->lun_sep_lock);
1472 return 0;
1473}
a12f41f8 1474EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1475
695434e1
NB		 1476/*
1477 * Used by fabric module frontends to queue tasks directly.
1478 * Many only be used from process context only
1479 */
1480int transport_handle_cdb_direct(
1481 struct se_cmd *cmd)
1482{
dd8ae59d
NB		 1483 int ret;
1484
695434e1
NB		 1485 if (!cmd->se_lun) {
1486 dump_stack();
6708bb27 1487 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1488 return -EINVAL;
1489 }
1490 if (in_interrupt()) {
1491 dump_stack();
6708bb27 1492 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1493 " from interrupt context\n");
1494 return -EINVAL;
1495 }
dd8ae59d 1496 /*
7d680f3b 1497 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
dd8ae59d
NB		 1498 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1499 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1500 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1501 *
1502 * Also, we don't take cmd->t_state_lock here as we only expect
1503 * this to be called for initial descriptor submission.
1504 */
1505 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1506 cmd->transport_state |= CMD_T_ACTIVE;
1507
dd8ae59d
NB		 1508 /*
1509 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1510 * so follow TRANSPORT_NEW_CMD processing thread context usage
1511 * and call transport_generic_request_failure() if necessary..
1512 */
1513 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1514 if (ret < 0)
1515 transport_generic_request_failure(cmd);
1516
dd8ae59d 1517 return 0;
695434e1
NB		 1518}
1519EXPORT_SYMBOL(transport_handle_cdb_direct);
1520
a6360785
NB		 1521/**
1522 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1523 *
1524 * @se_cmd: command descriptor to submit
1525 * @se_sess: associated se_sess for endpoint
1526 * @cdb: pointer to SCSI CDB
1527 * @sense: pointer to SCSI sense buffer
1528 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1529 * @data_length: fabric expected data transfer length
1530 * @task_addr: SAM task attribute
1531 * @data_dir: DMA data direction
1532 * @flags: flags for command submission from target_sc_flags_tables
1533 *
1534 * This may only be called from process context, and also currently
1535 * assumes internal allocation of fabric payload buffer by target-core.
1536 **/
1edcdb49 1537void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1538 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1539 u32 data_length, int task_attr, int data_dir, int flags)
1540{
1541 struct se_portal_group *se_tpg;
1542 int rc;
1543
1544 se_tpg = se_sess->se_tpg;
1545 BUG_ON(!se_tpg);
1546 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1547 BUG_ON(in_interrupt());
1548 /*
1549 * Initialize se_cmd for target operation. From this point
1550 * exceptions are handled by sending exception status via
1551 * target_core_fabric_ops->queue_status() callback
1552 */
1553 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1554 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1555 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1556 se_cmd->unknown_data_length = 1;
a6360785
NB		 1557 /*
1558 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1559 * se_sess->sess_cmd_list. A second kref_get here is necessary
1560 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1561 * kref_put() to happen during fabric packet acknowledgement.
1562 */
1563 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1564 /*
1565 * Signal bidirectional data payloads to target-core
1566 */
1567 if (flags & TARGET_SCF_BIDI_OP)
1568 se_cmd->se_cmd_flags |= SCF_BIDI;
1569 /*
1570 * Locate se_lun pointer and attach it to struct se_cmd
1571 */
735703ca
NB		 1572 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1573 transport_send_check_condition_and_sense(se_cmd,
1574 se_cmd->scsi_sense_reason, 0);
1575 target_put_sess_cmd(se_sess, se_cmd);
1576 return;
1577 }
d6e0175c 1578
a12f41f8 1579 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca
NB		 1580 if (rc != 0) {
1581 transport_generic_request_failure(se_cmd);
1582 return;
1583 }
11e319ed
AG		 1584
1585 /*
1586 * Check if we need to delay processing because of ALUA
1587 * Active/NonOptimized primary access state..
1588 */
1589 core_alua_check_nonop_delay(se_cmd);
1590
a6360785 1591 transport_handle_cdb_direct(se_cmd);
1edcdb49 1592 return;
a6360785
NB		 1593}
1594EXPORT_SYMBOL(target_submit_cmd);
1595
9f0d05c2
NB		 1596static void target_complete_tmr_failure(struct work_struct *work)
1597{
1598 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1599
1600 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1601 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1602 transport_generic_free_cmd(se_cmd, 0);
1603}
1604
ea98d7f9
AG		 1605/**
1606 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1607 * for TMR CDBs
1608 *
1609 * @se_cmd: command descriptor to submit
1610 * @se_sess: associated se_sess for endpoint
1611 * @sense: pointer to SCSI sense buffer
1612 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1613 * @fabric_context: fabric context for TMR req
1614 * @tm_type: Type of TM request
c0974f89
NB		 1615 * @gfp: gfp type for caller
1616 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1617 * @flags: submit cmd flags
ea98d7f9
AG		 1618 *
1619 * Callable from all contexts.
1620 **/
1621
c7042cae 1622int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1623 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1624 void *fabric_tmr_ptr, unsigned char tm_type,
1625 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1626{
1627 struct se_portal_group *se_tpg;
1628 int ret;
1629
1630 se_tpg = se_sess->se_tpg;
1631 BUG_ON(!se_tpg);
1632
1633 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1634 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1635 /*
1636 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1637 * allocation failure.
1638 */
c0974f89 1639 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1640 if (ret < 0)
1641 return -ENOMEM;
ea98d7f9 1642
c0974f89
NB		 1643 if (tm_type == TMR_ABORT_TASK)
1644 se_cmd->se_tmr_req->ref_task_tag = tag;
1645
ea98d7f9
AG		 1646 /* See target_submit_cmd for commentary */
1647 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1648
ea98d7f9
AG		 1649 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1650 if (ret) {
9f0d05c2
NB		 1651 /*
1652 * For callback during failure handling, push this work off
1653 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1654 */
1655 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1656 schedule_work(&se_cmd->work);
c7042cae 1657 return 0;
ea98d7f9
AG		 1658 }
1659 transport_generic_handle_tmr(se_cmd);
c7042cae 1660 return 0;
ea98d7f9
AG		 1661}
1662EXPORT_SYMBOL(target_submit_tmr);
1663
c66ac9db
NB		 1664/* transport_generic_handle_tmr():
1665 *
1666 *
1667 */
1668int transport_generic_handle_tmr(
1669 struct se_cmd *cmd)
1670{
f7a5cc0b 1671 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1672 return 0;
1673}
1674EXPORT_SYMBOL(transport_generic_handle_tmr);
1675
cdbb70bb 1676/*
cf572a96 1677 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1678 * has completed.
1679 */
cf572a96 1680bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1681{
cdbb70bb
CH		 1682 bool was_active = false;
1683
cf572a96
CH		 1684 if (cmd->transport_state & CMD_T_BUSY) {
1685 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1686 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1687
cf572a96
CH		 1688 pr_debug("cmd %p waiting to complete\n", cmd);
1689 wait_for_completion(&cmd->task_stop_comp);
1690 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1691
1692 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1693 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1694 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1695 was_active = true;
1696 }
1697
cdbb70bb
CH		 1698 return was_active;
1699}
1700
c66ac9db
NB		 1701/*
1702 * Handle SAM-esque emulation for generic transport request failures.
1703 */
2fbff127 1704void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1705{
07bde79a
NB		 1706 int ret = 0;
1707
6708bb27 1708 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1709 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1710 cmd->t_task_cdb[0]);
03e98c9e 1711 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1712 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1713 cmd->t_state, cmd->scsi_sense_reason);
d43d6aea 1714 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1715 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1716 (cmd->transport_state & CMD_T_STOP) != 0,
1717 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1718
c66ac9db
NB		 1719 /*
1720 * For SAM Task Attribute emulation for failed struct se_cmd
1721 */
1722 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1723 transport_complete_task_attr(cmd);
1724
03e98c9e
NB		 1725 switch (cmd->scsi_sense_reason) {
1726 case TCM_NON_EXISTENT_LUN:
1727 case TCM_UNSUPPORTED_SCSI_OPCODE:
1728 case TCM_INVALID_CDB_FIELD:
1729 case TCM_INVALID_PARAMETER_LIST:
1730 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1731 case TCM_UNKNOWN_MODE_PAGE:
1732 case TCM_WRITE_PROTECTED:
1733 case TCM_CHECK_CONDITION_ABORT_CMD:
1734 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1735 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1736 break;
03e98c9e 1737 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1738 /*
1739 * No SENSE Data payload for this case, set SCSI Status
1740 * and queue the response to $FABRIC_MOD.
1741 *
1742 * Uses linux/include/scsi/scsi.h SAM status codes defs
1743 */
1744 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1745 /*
1746 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1747 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1748 * CONFLICT STATUS.
1749 *
1750 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1751 */
e3d6f909
AG		 1752 if (cmd->se_sess &&
1753 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1754 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1755 cmd->orig_fe_lun, 0x2C,
1756 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1757
07bde79a 1758 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1759 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1760 goto queue_full;
c66ac9db 1761 goto check_stop;
c66ac9db 1762 default:
6708bb27 1763 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1764 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1765 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1766 break;
1767 }
f3146437 1768
03e98c9e
NB		 1769 ret = transport_send_check_condition_and_sense(cmd,
1770 cmd->scsi_sense_reason, 0);
1771 if (ret == -EAGAIN || ret == -ENOMEM)
1772 goto queue_full;
07bde79a 1773
c66ac9db
NB		 1774check_stop:
1775 transport_lun_remove_cmd(cmd);
6708bb27 1776 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1777 ;
07bde79a
NB		 1778 return;
1779
1780queue_full:
e057f533
CH		 1781 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1782 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1783}
2fbff127 1784EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1785
5f41a31d 1786static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1787{
0c2ad7d1 1788 int error = 0;
5f41a31d
CH		 1789
1790 spin_lock_irq(&cmd->t_state_lock);
1791 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1792 spin_unlock_irq(&cmd->t_state_lock);
1793
1794 if (cmd->execute_cmd)
1795 error = cmd->execute_cmd(cmd);
5f41a31d
CH		 1796
1797 if (error) {
1798 spin_lock_irq(&cmd->t_state_lock);
1799 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1800 spin_unlock_irq(&cmd->t_state_lock);
1801
1802 transport_generic_request_failure(cmd);
1803 }
1804}
1805
70baf0ab 1806void target_execute_cmd(struct se_cmd *cmd)
5f41a31d
CH		 1807{
1808 struct se_device *dev = cmd->se_dev;
1809
d59a02b4
CH		 1810 /*
1811 * If the received CDB has aleady been aborted stop processing it here.
1812 */
1813 if (transport_check_aborted_status(cmd, 1))
1814 return;
1815
f7113a47
CH		 1816 /*
1817 * Determine if IOCTL context caller in requesting the stopping of this
1818 * command for LUN shutdown purposes.
1819 */
1820 spin_lock_irq(&cmd->t_state_lock);
1821 if (cmd->transport_state & CMD_T_LUN_STOP) {
1822 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1823 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1824
1825 cmd->transport_state &= ~CMD_T_ACTIVE;
1826 spin_unlock_irq(&cmd->t_state_lock);
1827 complete(&cmd->transport_lun_stop_comp);
1828 return;
1829 }
1830 /*
1831 * Determine if frontend context caller is requesting the stopping of
1832 * this command for frontend exceptions.
1833 */
1834 if (cmd->transport_state & CMD_T_STOP) {
1835 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1836 __func__, __LINE__,
1837 cmd->se_tfo->get_task_tag(cmd));
1838
1839 spin_unlock_irq(&cmd->t_state_lock);
1840 complete(&cmd->t_transport_stop_comp);
5f41a31d 1841 return;
f7113a47
CH		 1842 }
1843
1844 cmd->t_state = TRANSPORT_PROCESSING;
1845 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d
CH		 1846
1847 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1848 goto execute;
1849
c66ac9db 1850 /*
25985edc 1851 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1852 * to allow the passed struct se_cmd list of tasks to the front of the list.
1853 */
5f41a31d
CH		 1854 switch (cmd->sam_task_attr) {
1855 case MSG_HEAD_TAG:
1856 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1857 "se_ordered_id: %u\n",
1858 cmd->t_task_cdb[0], cmd->se_ordered_id);
1859 goto execute;
1860 case MSG_ORDERED_TAG:
1861 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1862 smp_mb__after_atomic_inc();
1863
5f41a31d
CH		 1864 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1865 " se_ordered_id: %u\n",
1866 cmd->t_task_cdb[0], cmd->se_ordered_id);
1867
c66ac9db 1868 /*
5f41a31d
CH		 1869 * Execute an ORDERED command if no other older commands
1870 * exist that need to be completed first.
c66ac9db 1871 */
5f41a31d
CH		 1872 if (!atomic_read(&dev->simple_cmds))
1873 goto execute;
1874 break;
1875 default:
c66ac9db
NB		 1876 /*
1877 * For SIMPLE and UNTAGGED Task Attribute commands
1878 */
5f41a31d 1879 atomic_inc(&dev->simple_cmds);
c66ac9db 1880 smp_mb__after_atomic_inc();
5f41a31d 1881 break;
c66ac9db 1882 }
5f41a31d
CH		 1883
1884 if (atomic_read(&dev->dev_ordered_sync) != 0) {
1885 spin_lock(&dev->delayed_cmd_lock);
5f41a31d
CH		 1886 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1887 spin_unlock(&dev->delayed_cmd_lock);
c66ac9db 1888
6708bb27 1889 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 1890 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 1891 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db 1892 cmd->se_ordered_id);
5f41a31d 1893 return;
c66ac9db 1894 }
c66ac9db 1895
5f41a31d 1896execute:
c66ac9db 1897 /*
5f41a31d 1898 * Otherwise, no ORDERED task attributes exist..
c66ac9db 1899 */
5f41a31d 1900 __target_execute_cmd(cmd);
c66ac9db 1901}
70baf0ab 1902EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1903
c66ac9db
NB		 1904/*
1905 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
1906 */
1907static int transport_get_sense_data(struct se_cmd *cmd)
1908{
1909 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 1910 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 1911 unsigned long flags;
1912 u32 offset = 0;
1913
e3d6f909
AG		 1914 WARN_ON(!cmd->se_lun);
1915
42bf829e
CH		 1916 if (!dev)
1917 return 0;
1918
a1d8b49a 1919 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1920 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 1921 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1922 return 0;
1923 }
1924
cf572a96
CH		 1925 if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
1926 goto out;
c66ac9db 1927
cf572a96
CH		 1928 if (!dev->transport->get_sense_buffer) {
1929 pr_err("dev->transport->get_sense_buffer is NULL\n");
1930 goto out;
1931 }
c66ac9db 1932
5787cacd 1933 sense_buffer = dev->transport->get_sense_buffer(cmd);
cf572a96 1934 if (!sense_buffer) {
5787cacd 1935 pr_err("ITT 0x%08x cmd %p: Unable to locate"
cf572a96 1936 " sense buffer for task with sense\n",
5787cacd 1937 cmd->se_tfo->get_task_tag(cmd), cmd);
cf572a96 1938 goto out;
c66ac9db 1939 }
5787cacd 1940
cf572a96
CH		 1941 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1942
1943 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
1944
1945 memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
cf572a96
CH		 1946
1947 /* Automatically padded */
1948 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
1949
1950 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
1951 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
1952 return 0;
1953
785fdf70 1954out:
a1d8b49a 1955 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1956 return -1;
1957}
1958
5f41a31d
CH		 1959/*
1960 * Process all commands up to the last received ORDERED task attribute which
1961 * requires another blocking boundary
1962 */
1963static void target_restart_delayed_cmds(struct se_device *dev)
1964{
1965 for (;;) {
1966 struct se_cmd *cmd;
1967
1968 spin_lock(&dev->delayed_cmd_lock);
1969 if (list_empty(&dev->delayed_cmd_list)) {
1970 spin_unlock(&dev->delayed_cmd_lock);
1971 break;
1972 }
1973
1974 cmd = list_entry(dev->delayed_cmd_list.next,
1975 struct se_cmd, se_delayed_node);
1976 list_del(&cmd->se_delayed_node);
1977 spin_unlock(&dev->delayed_cmd_lock);
1978
1979 __target_execute_cmd(cmd);
1980
1981 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1982 break;
1983 }
1984}
1985
c66ac9db 1986/*
35e0e757 1987 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1988 * and ordered cmds need to have their tasks added to the execution queue.
1989 */
1990static void transport_complete_task_attr(struct se_cmd *cmd)
1991{
5951146d 1992 struct se_device *dev = cmd->se_dev;
c66ac9db 1993
e66ecd50 1994 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1995 atomic_dec(&dev->simple_cmds);
1996 smp_mb__after_atomic_dec();
1997 dev->dev_cur_ordered_id++;
6708bb27 1998 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1999 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
2000 cmd->se_ordered_id);
e66ecd50 2001 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 2002 dev->dev_cur_ordered_id++;
6708bb27 2003 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 2004 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
2005 cmd->se_ordered_id);
e66ecd50 2006 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 2007 atomic_dec(&dev->dev_ordered_sync);
2008 smp_mb__after_atomic_dec();
c66ac9db
NB		 2009
2010 dev->dev_cur_ordered_id++;
6708bb27 2011 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 2012 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
2013 }
c66ac9db 2014
5f41a31d 2015 target_restart_delayed_cmds(dev);
c66ac9db
NB		 2016}
2017
e057f533 2018static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 2019{
2020 int ret = 0;
2021
e057f533
CH		 2022 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2023 transport_complete_task_attr(cmd);
2024
2025 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2026 ret = cmd->se_tfo->queue_status(cmd);
2027 if (ret)
2028 goto out;
2029 }
07bde79a
NB		 2030
2031 switch (cmd->data_direction) {
2032 case DMA_FROM_DEVICE:
2033 ret = cmd->se_tfo->queue_data_in(cmd);
2034 break;
2035 case DMA_TO_DEVICE:
ec98f782 2036 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 2037 ret = cmd->se_tfo->queue_data_in(cmd);
2038 if (ret < 0)
e057f533 2039 break;
07bde79a
NB		 2040 }
2041 /* Fall through for DMA_TO_DEVICE */
2042 case DMA_NONE:
2043 ret = cmd->se_tfo->queue_status(cmd);
2044 break;
2045 default:
2046 break;
2047 }
2048
e057f533
CH		 2049out:
2050 if (ret < 0) {
2051 transport_handle_queue_full(cmd, cmd->se_dev);
2052 return;
2053 }
2054 transport_lun_remove_cmd(cmd);
2055 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2056}
2057
2058static void transport_handle_queue_full(
2059 struct se_cmd *cmd,
e057f533 2060 struct se_device *dev)
07bde79a
NB		 2061{
2062 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 2063 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2064 atomic_inc(&dev->dev_qf_count);
2065 smp_mb__after_atomic_inc();
2066 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2067
2068 schedule_work(&cmd->se_dev->qf_work_queue);
2069}
2070
35e0e757 2071static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2072{
35e0e757 2073 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 2074 int reason = 0, ret;
35e0e757 2075
c66ac9db
NB		 2076 /*
2077 * Check if we need to move delayed/dormant tasks from cmds on the
2078 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2079 * Attribute.
2080 */
5951146d 2081 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 2082 transport_complete_task_attr(cmd);
07bde79a
NB		 2083 /*
2084 * Check to schedule QUEUE_FULL work, or execute an existing
2085 * cmd->transport_qf_callback()
2086 */
2087 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2088 schedule_work(&cmd->se_dev->qf_work_queue);
2089
c66ac9db
NB		 2090 /*
2091 * Check if we need to retrieve a sense buffer from
2092 * the struct se_cmd in question.
2093 */
2094 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2095 if (transport_get_sense_data(cmd) < 0)
2096 reason = TCM_NON_EXISTENT_LUN;
2097
c66ac9db 2098 if (cmd->scsi_status) {
07bde79a 2099 ret = transport_send_check_condition_and_sense(
c66ac9db 2100 cmd, reason, 1);
f147abb4 2101 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 2102 goto queue_full;
2103
c66ac9db
NB		 2104 transport_lun_remove_cmd(cmd);
2105 transport_cmd_check_stop_to_fabric(cmd);
2106 return;
2107 }
2108 }
2109 /*
25985edc 2110 * Check for a callback, used by amongst other things
c66ac9db
NB		 2111 * XDWRITE_READ_10 emulation.
2112 */
2113 if (cmd->transport_complete_callback)
2114 cmd->transport_complete_callback(cmd);
2115
2116 switch (cmd->data_direction) {
2117 case DMA_FROM_DEVICE:
2118 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2119 if (cmd->se_lun->lun_sep) {
2120 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2121 cmd->data_length;
2122 }
2123 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 2124
07bde79a 2125 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2126 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2127 goto queue_full;
c66ac9db
NB		 2128 break;
2129 case DMA_TO_DEVICE:
2130 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2131 if (cmd->se_lun->lun_sep) {
2132 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2133 cmd->data_length;
2134 }
2135 spin_unlock(&cmd->se_lun->lun_sep_lock);
2136 /*
2137 * Check if we need to send READ payload for BIDI-COMMAND
2138 */
ec98f782 2139 if (cmd->t_bidi_data_sg) {
c66ac9db 2140 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2141 if (cmd->se_lun->lun_sep) {
2142 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2143 cmd->data_length;
2144 }
2145 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2146 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2147 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2148 goto queue_full;
c66ac9db
NB		 2149 break;
2150 }
2151 /* Fall through for DMA_TO_DEVICE */
2152 case DMA_NONE:
07bde79a 2153 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2154 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2155 goto queue_full;
c66ac9db
NB		 2156 break;
2157 default:
2158 break;
2159 }
2160
2161 transport_lun_remove_cmd(cmd);
2162 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2163 return;
2164
2165queue_full:
6708bb27 2166 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2167 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2168 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2169 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2170}
2171
6708bb27 2172static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2173{
ec98f782 2174 struct scatterlist *sg;
ec98f782 2175 int count;
c66ac9db 2176
6708bb27
AG		 2177 for_each_sg(sgl, sg, nents, count)
2178 __free_page(sg_page(sg));
c66ac9db 2179
6708bb27
AG		 2180 kfree(sgl);
2181}
c66ac9db 2182
6708bb27
AG		 2183static inline void transport_free_pages(struct se_cmd *cmd)
2184{
2185 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2186 return;
2187
2188 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2189 cmd->t_data_sg = NULL;
2190 cmd->t_data_nents = 0;
c66ac9db 2191
6708bb27 2192 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2193 cmd->t_bidi_data_sg = NULL;
2194 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2195}
2196
e26d99ae
CH		 2197/**
2198 * transport_release_cmd - free a command
2199 * @cmd: command to free
2200 *
2201 * This routine unconditionally frees a command, and reference counting
2202 * or list removal must be done in the caller.
2203 */
2204static void transport_release_cmd(struct se_cmd *cmd)
2205{
2206 BUG_ON(!cmd->se_tfo);
2207
c8e31f26 2208 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2209 core_tmr_release_req(cmd->se_tmr_req);
2210 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2211 kfree(cmd->t_task_cdb);
2212 /*
7481deb4
NB		 2213 * If this cmd has been setup with target_get_sess_cmd(), drop
2214 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2215 */
7481deb4
NB		 2216 if (cmd->check_release != 0) {
2217 target_put_sess_cmd(cmd->se_sess, cmd);
2218 return;
2219 }
e26d99ae
CH		 2220 cmd->se_tfo->release_cmd(cmd);
2221}
2222
d3df7825
CH		 2223/**
2224 * transport_put_cmd - release a reference to a command
2225 * @cmd: command to release
2226 *
2227 * This routine releases our reference to the command and frees it if possible.
2228 */
39c05f32 2229static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 2230{
2231 unsigned long flags;
c66ac9db 2232
a1d8b49a 2233 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 2234 if (atomic_read(&cmd->t_fe_count)) {
2235 if (!atomic_dec_and_test(&cmd->t_fe_count))
2236 goto out_busy;
2237 }
2238
7d680f3b
CH		 2239 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2240 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2241 target_remove_from_state_list(cmd);
c66ac9db 2242 }
a1d8b49a 2243 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2244
c66ac9db 2245 transport_free_pages(cmd);
31afc39c 2246 transport_release_cmd(cmd);
39c05f32 2247 return;
4911e3cc
CH		 2248out_busy:
2249 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2250}
2251
c66ac9db 2252/*
ec98f782
AG		 2253 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2254 * allocating in the core.
c66ac9db
NB		 2255 * @cmd: Associated se_cmd descriptor
2256 * @mem: SGL style memory for TCM WRITE / READ
2257 * @sg_mem_num: Number of SGL elements
2258 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2259 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2260 *
2261 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2262 * of parameters.
2263 */
2264int transport_generic_map_mem_to_cmd(
2265 struct se_cmd *cmd,
5951146d
AG		 2266 struct scatterlist *sgl,
2267 u32 sgl_count,
2268 struct scatterlist *sgl_bidi,
2269 u32 sgl_bidi_count)
c66ac9db 2270{
5951146d 2271 if (!sgl || !sgl_count)
c66ac9db 2272 return 0;
c66ac9db 2273
64f1db38
CH		 2274 /*
2275 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2276 * scatterlists already have been set to follow what the fabric
2277 * passes for the original expected data transfer length.
2278 */
2279 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2280 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2281 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2282 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2283 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2284 return -EINVAL;
2285 }
c66ac9db 2286
64f1db38
CH		 2287 cmd->t_data_sg = sgl;
2288 cmd->t_data_nents = sgl_count;
c66ac9db 2289
64f1db38
CH		 2290 if (sgl_bidi && sgl_bidi_count) {
2291 cmd->t_bidi_data_sg = sgl_bidi;
2292 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db 2293 }
64f1db38 2294 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 2295 return 0;
2296}
2297EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2298
4949314c 2299void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2300{
ec98f782 2301 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2302 struct page **pages;
2303 int i;
05d1c7c0 2304
ec98f782 2305 BUG_ON(!sg);
05d1c7c0 2306 /*
ec98f782
AG		 2307 * We need to take into account a possible offset here for fabrics like
2308 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2309 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2310 */
4949314c
AG		 2311 if (!cmd->t_data_nents)
2312 return NULL;
2313 else if (cmd->t_data_nents == 1)
2314 return kmap(sg_page(sg)) + sg->offset;
2315
2316 /* >1 page. use vmap */
2317 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2318 if (!pages)
2319 return NULL;
2320
2321 /* convert sg[] to pages[] */
2322 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2323 pages[i] = sg_page(sg);
2324 }
2325
2326 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2327 kfree(pages);
2328 if (!cmd->t_data_vmap)
2329 return NULL;
2330
2331 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2332}
4949314c 2333EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2334
4949314c 2335void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2336{
a1edf9cf 2337 if (!cmd->t_data_nents) {
4949314c 2338 return;
a1edf9cf 2339 } else if (cmd->t_data_nents == 1) {
4949314c 2340 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2341 return;
2342 }
4949314c
AG		 2343
2344 vunmap(cmd->t_data_vmap);
2345 cmd->t_data_vmap = NULL;
05d1c7c0 2346}
4949314c 2347EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2348
c66ac9db 2349static int
05d1c7c0 2350transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2351{
ec98f782
AG		 2352 u32 length = cmd->data_length;
2353 unsigned int nents;
2354 struct page *page;
9db9da33 2355 gfp_t zero_flag;
ec98f782 2356 int i = 0;
c66ac9db 2357
ec98f782
AG		 2358 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2359 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2360 if (!cmd->t_data_sg)
2361 return -ENOMEM;
c66ac9db 2362
ec98f782
AG		 2363 cmd->t_data_nents = nents;
2364 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2365
64f1db38 2366 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2367
ec98f782
AG		 2368 while (length) {
2369 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2370 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2371 if (!page)
2372 goto out;
c66ac9db 2373
ec98f782
AG		 2374 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2375 length -= page_len;
2376 i++;
c66ac9db 2377 }
c66ac9db 2378 return 0;
c66ac9db 2379
ec98f782
AG		 2380out:
2381 while (i >= 0) {
2382 __free_page(sg_page(&cmd->t_data_sg[i]));
2383 i--;
c66ac9db 2384 }
ec98f782
AG		 2385 kfree(cmd->t_data_sg);
2386 cmd->t_data_sg = NULL;
2387 return -ENOMEM;
c66ac9db
NB		 2388}
2389
da0f7619 2390/*
b16a35b0
AG		 2391 * Allocate any required resources to execute the command. For writes we
2392 * might not have the payload yet, so notify the fabric via a call to
2393 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2394 */
a1d8b49a 2395int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2396{
c66ac9db
NB		 2397 int ret = 0;
2398
2399 /*
2400 * Determine is the TCM fabric module has already allocated physical
2401 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2402 * beforehand.
c66ac9db 2403 */
ec98f782
AG		 2404 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2405 cmd->data_length) {
05d1c7c0 2406 ret = transport_generic_get_mem(cmd);
c66ac9db 2407 if (ret < 0)
03e98c9e 2408 goto out_fail;
c66ac9db 2409 }
da0f7619 2410
4101f0a8 2411 /* Workaround for handling zero-length control CDBs */
64f1db38 2412 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) {
7d680f3b 2413 spin_lock_irq(&cmd->t_state_lock);
410f6702 2414 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 2415 cmd->transport_state |= CMD_T_ACTIVE;
2416 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 2417
2418 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2419 u8 ua_asc = 0, ua_ascq = 0;
2420
2421 core_scsi3_ua_clear_for_request_sense(cmd,
2422 &ua_asc, &ua_ascq);
2423 }
2424
410f6702
RD		 2425 INIT_WORK(&cmd->work, target_complete_ok_work);
2426 queue_work(target_completion_wq, &cmd->work);
2427 return 0;
2428 }
da0f7619 2429
4101f0a8 2430 atomic_inc(&cmd->t_fe_count);
4101f0a8 2431
c66ac9db 2432 /*
c3196f0c
CH		 2433 * If this command is not a write we can execute it right here,
2434 * for write buffers we need to notify the fabric driver first
2435 * and let it call back once the write buffers are ready.
c66ac9db 2436 */
5f41a31d 2437 target_add_to_state_list(cmd);
c3196f0c
CH		 2438 if (cmd->data_direction != DMA_TO_DEVICE) {
2439 target_execute_cmd(cmd);
2440 return 0;
2441 }
2442
2443 spin_lock_irq(&cmd->t_state_lock);
2444 cmd->t_state = TRANSPORT_WRITE_PENDING;
2445 spin_unlock_irq(&cmd->t_state_lock);
2446
2447 transport_cmd_check_stop(cmd, false);
2448
2449 ret = cmd->se_tfo->write_pending(cmd);
2450 if (ret == -EAGAIN || ret == -ENOMEM)
2451 goto queue_full;
2452
2453 if (ret < 0)
2454 return ret;
2455 return 1;
da0f7619
CH		 2456
2457out_fail:
2458 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2459 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2460 return -EINVAL;
c3196f0c
CH		 2461queue_full:
2462 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2463 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2464 transport_handle_queue_full(cmd, cmd->se_dev);
2465 return 0;
c66ac9db 2466}
a1d8b49a 2467EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2468
e057f533 2469static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2470{
f147abb4
NB		 2471 int ret;
2472
2473 ret = cmd->se_tfo->write_pending(cmd);
2474 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2475 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2476 cmd);
2477 transport_handle_queue_full(cmd, cmd->se_dev);
2478 }
07bde79a
NB		 2479}
2480
39c05f32 2481void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2482{
d14921d6 2483 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2484 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2485 transport_wait_for_tasks(cmd);
2486
35462975 2487 transport_release_cmd(cmd);
d14921d6
NB		 2488 } else {
2489 if (wait_for_tasks)
2490 transport_wait_for_tasks(cmd);
2491
c66ac9db
NB		 2492 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2493
82f1c8a4 2494 if (cmd->se_lun)
c66ac9db 2495 transport_lun_remove_cmd(cmd);
c66ac9db 2496
39c05f32 2497 transport_put_cmd(cmd);
c66ac9db
NB		 2498 }
2499}
2500EXPORT_SYMBOL(transport_generic_free_cmd);
2501
a17f091d
NB		 2502/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2503 * @se_sess: session to reference
2504 * @se_cmd: command descriptor to add
a6360785 2505 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2506 */
a6360785
NB		 2507void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2508 bool ack_kref)
a17f091d
NB		 2509{
2510 unsigned long flags;
2511
7481deb4 2512 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2513 /*
2514 * Add a second kref if the fabric caller is expecting to handle
2515 * fabric acknowledgement that requires two target_put_sess_cmd()
2516 * invocations before se_cmd descriptor release.
2517 */
86715569 2518 if (ack_kref == true) {
a6360785 2519 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2520 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2521 }
7481deb4 2522
a17f091d
NB		 2523 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2524 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2525 se_cmd->check_release = 1;
2526 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2527}
2528EXPORT_SYMBOL(target_get_sess_cmd);
2529
7481deb4 2530static void target_release_cmd_kref(struct kref *kref)
a17f091d 2531{
7481deb4
NB		 2532 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2533 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 2534 unsigned long flags;
2535
2536 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2537 if (list_empty(&se_cmd->se_cmd_list)) {
2538 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
ffc32d52 2539 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2540 return;
a17f091d 2541 }
a17f091d
NB		 2542 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2543 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2544 complete(&se_cmd->cmd_wait_comp);
7481deb4 2545 return;
a17f091d
NB		 2546 }
2547 list_del(&se_cmd->se_cmd_list);
2548 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2549
7481deb4
NB		 2550 se_cmd->se_tfo->release_cmd(se_cmd);
2551}
2552
2553/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2554 * @se_sess: session to reference
2555 * @se_cmd: command descriptor to drop
2556 */
2557int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2558{
2559 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2560}
2561EXPORT_SYMBOL(target_put_sess_cmd);
2562
2563/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
2564 * @se_sess: session to split
2565 */
2566void target_splice_sess_cmd_list(struct se_session *se_sess)
2567{
2568 struct se_cmd *se_cmd;
2569 unsigned long flags;
2570
2571 WARN_ON(!list_empty(&se_sess->sess_wait_list));
2572 INIT_LIST_HEAD(&se_sess->sess_wait_list);
2573
2574 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2575 se_sess->sess_tearing_down = 1;
2576
2577 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2578
2579 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2580 se_cmd->cmd_wait_set = 1;
2581
2582 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2583}
2584EXPORT_SYMBOL(target_splice_sess_cmd_list);
2585
2586/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2587 * @se_sess: session to wait for active I/O
2588 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2589 */
2590void target_wait_for_sess_cmds(
2591 struct se_session *se_sess,
2592 int wait_for_tasks)
2593{
2594 struct se_cmd *se_cmd, *tmp_cmd;
2595 bool rc = false;
2596
2597 list_for_each_entry_safe(se_cmd, tmp_cmd,
2598 &se_sess->sess_wait_list, se_cmd_list) {
2599 list_del(&se_cmd->se_cmd_list);
2600
2601 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2602 " %d\n", se_cmd, se_cmd->t_state,
2603 se_cmd->se_tfo->get_cmd_state(se_cmd));
2604
2605 if (wait_for_tasks) {
2606 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2607 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2608 se_cmd->se_tfo->get_cmd_state(se_cmd));
2609
2610 rc = transport_wait_for_tasks(se_cmd);
2611
2612 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2613 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2614 se_cmd->se_tfo->get_cmd_state(se_cmd));
2615 }
2616
2617 if (!rc) {
2618 wait_for_completion(&se_cmd->cmd_wait_comp);
2619 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2620 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2621 se_cmd->se_tfo->get_cmd_state(se_cmd));
2622 }
2623
2624 se_cmd->se_tfo->release_cmd(se_cmd);
2625 }
2626}
2627EXPORT_SYMBOL(target_wait_for_sess_cmds);
2628
c66ac9db
NB		 2629/* transport_lun_wait_for_tasks():
2630 *
2631 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2632 * an struct se_lun to be successfully shutdown.
2633 */
2634static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2635{
2636 unsigned long flags;
cf572a96
CH		 2637 int ret = 0;
2638
c66ac9db
NB		 2639 /*
2640 * If the frontend has already requested this struct se_cmd to
2641 * be stopped, we can safely ignore this struct se_cmd.
2642 */
a1d8b49a 2643 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2644 if (cmd->transport_state & CMD_T_STOP) {
2645 cmd->transport_state &= ~CMD_T_LUN_STOP;
2646
2647 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2648 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2649 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
f7113a47 2650 transport_cmd_check_stop(cmd, false);
e3d6f909 2651 return -EPERM;
c66ac9db 2652 }
7d680f3b 2653 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2654 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2655
5951146d 2656 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 2657
cf572a96
CH		 2658 // XXX: audit task_flags checks.
2659 spin_lock_irqsave(&cmd->t_state_lock, flags);
2660 if ((cmd->transport_state & CMD_T_BUSY) &&
2661 (cmd->transport_state & CMD_T_SENT)) {
2662 if (!target_stop_cmd(cmd, &flags))
2663 ret++;
cf572a96 2664 }
5f41a31d 2665 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2666
785fdf70
CH		 2667 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2668 " %d\n", cmd, ret);
c66ac9db 2669 if (!ret) {
6708bb27 2670 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2671 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2672 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2673 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2674 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2675 }
3df8d40b 2676 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 2677
2678 return 0;
2679}
2680
c66ac9db
NB		 2681static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2682{
2683 struct se_cmd *cmd = NULL;
2684 unsigned long lun_flags, cmd_flags;
2685 /*
2686 * Do exception processing and return CHECK_CONDITION status to the
2687 * Initiator Port.
2688 */
2689 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2690 while (!list_empty(&lun->lun_cmd_list)) {
2691 cmd = list_first_entry(&lun->lun_cmd_list,
2692 struct se_cmd, se_lun_node);
3d26fea0 2693 list_del_init(&cmd->se_lun_node);
5951146d 2694
a1d8b49a 2695 spin_lock(&cmd->t_state_lock);
6708bb27 2696 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2697 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2698 cmd->se_lun->unpacked_lun,
2699 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2700 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2701 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2702
2703 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2704
6708bb27
AG		 2705 if (!cmd->se_lun) {
2706 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2707 cmd->se_tfo->get_task_tag(cmd),
2708 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2709 BUG();
2710 }
2711 /*
2712 * If the Storage engine still owns the iscsi_cmd_t, determine
2713 * and/or stop its context.
2714 */
6708bb27 2715 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2716 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2717 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2718
e3d6f909 2719 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2720 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2721 continue;
2722 }
2723
6708bb27 2724 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2725 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2726 cmd->se_lun->unpacked_lun,
2727 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2728
a1d8b49a 2729 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2730 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2731 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2732 goto check_cond;
2733 }
7d680f3b 2734 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2735 target_remove_from_state_list(cmd);
a1d8b49a 2736 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2737
c66ac9db
NB		 2738 /*
2739 * The Storage engine stopped this struct se_cmd before it was
2740 * send to the fabric frontend for delivery back to the
2741 * Initiator Node. Return this SCSI CDB back with an
2742 * CHECK_CONDITION status.
2743 */
2744check_cond:
2745 transport_send_check_condition_and_sense(cmd,
2746 TCM_NON_EXISTENT_LUN, 0);
2747 /*
2748 * If the fabric frontend is waiting for this iscsi_cmd_t to
2749 * be released, notify the waiting thread now that LU has
2750 * finished accessing it.
2751 */
a1d8b49a 2752 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2753 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2754 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2755 " struct se_cmd: %p ITT: 0x%08x\n",
2756 lun->unpacked_lun,
e3d6f909 2757 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2758
a1d8b49a 2759 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2760 cmd_flags);
f7113a47 2761 transport_cmd_check_stop(cmd, false);
a1d8b49a 2762 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2763 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2764 continue;
2765 }
6708bb27 2766 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2767 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2768
a1d8b49a 2769 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2770 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2771 }
2772 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2773}
2774
2775static int transport_clear_lun_thread(void *p)
2776{
8359cf43 2777 struct se_lun *lun = p;
c66ac9db
NB		 2778
2779 __transport_clear_lun_from_sessions(lun);
2780 complete(&lun->lun_shutdown_comp);
2781
2782 return 0;
2783}
2784
2785int transport_clear_lun_from_sessions(struct se_lun *lun)
2786{
2787 struct task_struct *kt;
2788
5951146d 2789 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2790 "tcm_cl_%u", lun->unpacked_lun);
2791 if (IS_ERR(kt)) {
6708bb27 2792 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2793 return PTR_ERR(kt);
c66ac9db
NB		 2794 }
2795 wait_for_completion(&lun->lun_shutdown_comp);
2796
2797 return 0;
2798}
2799
d14921d6
NB		 2800/**
2801 * transport_wait_for_tasks - wait for completion to occur
2802 * @cmd: command to wait
c66ac9db 2803 *
d14921d6
NB		 2804 * Called from frontend fabric context to wait for storage engine
2805 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2806 */
a17f091d 2807bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2808{
2809 unsigned long flags;
2810
a1d8b49a 2811 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2812 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2813 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2814 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2815 return false;
d14921d6 2816 }
cb4f4d3c 2817
c8e31f26
AG		 2818 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2819 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2820 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2821 return false;
d14921d6 2822 }
c66ac9db
NB		 2823 /*
2824 * If we are already stopped due to an external event (ie: LUN shutdown)
2825 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2826 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2827 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2828 * has completed its operation on the struct se_cmd.
2829 */
7d680f3b 2830 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2831 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2832 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2833 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2834 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2835 /*
2836 * There is a special case for WRITES where a FE exception +
2837 * LUN shutdown means ConfigFS context is still sleeping on
2838 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2839 * We go ahead and up transport_lun_stop_comp just to be sure
2840 * here.
2841 */
a1d8b49a
AG		 2842 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2843 complete(&cmd->transport_lun_stop_comp);
2844 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2845 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2846
cf572a96 2847 target_remove_from_state_list(cmd);
c66ac9db
NB		 2848 /*
2849 * At this point, the frontend who was the originator of this
2850 * struct se_cmd, now owns the structure and can be released through
2851 * normal means below.
2852 */
6708bb27 2853 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2854 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2855 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2856 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2857
7d680f3b 2858 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2859 }
7d680f3b 2860
3d28934a 2861 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2862 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2863 return false;
d14921d6 2864 }
c66ac9db 2865
7d680f3b 2866 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2867
6708bb27 2868 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2869 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2870 cmd, cmd->se_tfo->get_task_tag(cmd),
2871 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2872
a1d8b49a 2873 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2874
5951146d 2875 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 2876
a1d8b49a 2877 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2878
a1d8b49a 2879 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2880 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2881
6708bb27 2882 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 2883 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2884 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2885
d14921d6 2886 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2887
2888 return true;
c66ac9db 2889}
d14921d6 2890EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2891
2892static int transport_get_sense_codes(
2893 struct se_cmd *cmd,
2894 u8 *asc,
2895 u8 *ascq)
2896{
2897 *asc = cmd->scsi_asc;
2898 *ascq = cmd->scsi_ascq;
2899
2900 return 0;
2901}
2902
2903static int transport_set_sense_codes(
2904 struct se_cmd *cmd,
2905 u8 asc,
2906 u8 ascq)
2907{
2908 cmd->scsi_asc = asc;
2909 cmd->scsi_ascq = ascq;
2910
2911 return 0;
2912}
2913
2914int transport_send_check_condition_and_sense(
2915 struct se_cmd *cmd,
2916 u8 reason,
2917 int from_transport)
2918{
2919 unsigned char *buffer = cmd->sense_buffer;
2920 unsigned long flags;
2921 int offset;
2922 u8 asc = 0, ascq = 0;
2923
a1d8b49a 2924 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2925 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2926 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2927 return 0;
2928 }
2929 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2930 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2931
2932 if (!reason && from_transport)
2933 goto after_reason;
2934
2935 if (!from_transport)
2936 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2937 /*
2938 * Data Segment and SenseLength of the fabric response PDU.
2939 *
2940 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2941 * from include/scsi/scsi_cmnd.h
2942 */
e3d6f909 2943 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2944 TRANSPORT_SENSE_BUFFER);
2945 /*
2946 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2947 * SENSE KEY values from include/scsi/scsi.h
2948 */
2949 switch (reason) {
2950 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 2951 /* CURRENT ERROR */
2952 buffer[offset] = 0x70;
895f3022 2953 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 2954 /* ILLEGAL REQUEST */
2955 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2956 /* LOGICAL UNIT NOT SUPPORTED */
2957 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
2958 break;
c66ac9db
NB		 2959 case TCM_UNSUPPORTED_SCSI_OPCODE:
2960 case TCM_SECTOR_COUNT_TOO_MANY:
2961 /* CURRENT ERROR */
2962 buffer[offset] = 0x70;
895f3022 2963 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2964 /* ILLEGAL REQUEST */
2965 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2966 /* INVALID COMMAND OPERATION CODE */
2967 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
2968 break;
2969 case TCM_UNKNOWN_MODE_PAGE:
2970 /* CURRENT ERROR */
2971 buffer[offset] = 0x70;
895f3022 2972 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2973 /* ILLEGAL REQUEST */
2974 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2975 /* INVALID FIELD IN CDB */
2976 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2977 break;
2978 case TCM_CHECK_CONDITION_ABORT_CMD:
2979 /* CURRENT ERROR */
2980 buffer[offset] = 0x70;
895f3022 2981 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2982 /* ABORTED COMMAND */
2983 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2984 /* BUS DEVICE RESET FUNCTION OCCURRED */
2985 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
2986 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
2987 break;
2988 case TCM_INCORRECT_AMOUNT_OF_DATA:
2989 /* CURRENT ERROR */
2990 buffer[offset] = 0x70;
895f3022 2991 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 2992 /* ABORTED COMMAND */
2993 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2994 /* WRITE ERROR */
2995 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2996 /* NOT ENOUGH UNSOLICITED DATA */
2997 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
2998 break;
2999 case TCM_INVALID_CDB_FIELD:
3000 /* CURRENT ERROR */
3001 buffer[offset] = 0x70;
895f3022 3002 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 3003 /* ILLEGAL REQUEST */
3004 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 3005 /* INVALID FIELD IN CDB */
3006 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
3007 break;
3008 case TCM_INVALID_PARAMETER_LIST:
3009 /* CURRENT ERROR */
3010 buffer[offset] = 0x70;
895f3022 3011 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 3012 /* ILLEGAL REQUEST */
3013 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 3014 /* INVALID FIELD IN PARAMETER LIST */
3015 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
3016 break;
3017 case TCM_UNEXPECTED_UNSOLICITED_DATA:
3018 /* CURRENT ERROR */
3019 buffer[offset] = 0x70;
895f3022 3020 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3021 /* ABORTED COMMAND */
3022 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3023 /* WRITE ERROR */
3024 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
3025 /* UNEXPECTED_UNSOLICITED_DATA */
3026 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
3027 break;
3028 case TCM_SERVICE_CRC_ERROR:
3029 /* CURRENT ERROR */
3030 buffer[offset] = 0x70;
895f3022 3031 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3032 /* ABORTED COMMAND */
3033 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3034 /* PROTOCOL SERVICE CRC ERROR */
3035 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
3036 /* N/A */
3037 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
3038 break;
3039 case TCM_SNACK_REJECTED:
3040 /* CURRENT ERROR */
3041 buffer[offset] = 0x70;
895f3022 3042 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3043 /* ABORTED COMMAND */
3044 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3045 /* READ ERROR */
3046 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
3047 /* FAILED RETRANSMISSION REQUEST */
3048 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
3049 break;
3050 case TCM_WRITE_PROTECTED:
3051 /* CURRENT ERROR */
3052 buffer[offset] = 0x70;
895f3022 3053 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3054 /* DATA PROTECT */
3055 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
3056 /* WRITE PROTECTED */
3057 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
3058 break;
3059 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
3060 /* CURRENT ERROR */
3061 buffer[offset] = 0x70;
895f3022 3062 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3063 /* UNIT ATTENTION */
3064 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
3065 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3066 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3067 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3068 break;
3069 case TCM_CHECK_CONDITION_NOT_READY:
3070 /* CURRENT ERROR */
3071 buffer[offset] = 0x70;
895f3022 3072 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3073 /* Not Ready */
3074 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
3075 transport_get_sense_codes(cmd, &asc, &ascq);
3076 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3077 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3078 break;
3079 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3080 default:
3081 /* CURRENT ERROR */
3082 buffer[offset] = 0x70;
895f3022 3083 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 3084 /* ILLEGAL REQUEST */
3085 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3086 /* LOGICAL UNIT COMMUNICATION FAILURE */
3087 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
3088 break;
3089 }
3090 /*
3091 * This code uses linux/include/scsi/scsi.h SAM status codes!
3092 */
3093 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3094 /*
3095 * Automatically padded, this value is encoded in the fabric's
3096 * data_length response PDU containing the SCSI defined sense data.
3097 */
3098 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
3099
3100after_reason:
07bde79a 3101 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3102}
3103EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3104
3105int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3106{
3107 int ret = 0;
3108
7d680f3b 3109 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 3110 if (!send_status ||
c66ac9db
NB		 3111 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3112 return 1;
8b1e1244 3113
6708bb27 3114 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 3115 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 3116 cmd->t_task_cdb[0],
e3d6f909 3117 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3118
c66ac9db 3119 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 3120 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3121 ret = 1;
3122 }
3123 return ret;
3124}
3125EXPORT_SYMBOL(transport_check_aborted_status);
3126
3127void transport_send_task_abort(struct se_cmd *cmd)
3128{
c252f003
NB		 3129 unsigned long flags;
3130
3131 spin_lock_irqsave(&cmd->t_state_lock, flags);
3132 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3133 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3134 return;
3135 }
3136 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3137
c66ac9db
NB		 3138 /*
3139 * If there are still expected incoming fabric WRITEs, we wait
3140 * until until they have completed before sending a TASK_ABORTED
3141 * response. This response with TASK_ABORTED status will be
3142 * queued back to fabric module by transport_check_aborted_status().
3143 */
3144 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3145 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 3146 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 3147 smp_mb__after_atomic_inc();
c66ac9db
NB		 3148 }
3149 }
3150 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3151
6708bb27 3152 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 3153 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 3154 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3155
e3d6f909 3156 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3157}
3158
e26d99ae 3159static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 3160{
5951146d 3161 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3162 struct se_tmr_req *tmr = cmd->se_tmr_req;
3163 int ret;
3164
3165 switch (tmr->function) {
5c6cd613 3166 case TMR_ABORT_TASK:
3d28934a 3167 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3168 break;
5c6cd613
NB		 3169 case TMR_ABORT_TASK_SET:
3170 case TMR_CLEAR_ACA:
3171 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3172 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3173 break;
5c6cd613 3174 case TMR_LUN_RESET:
c66ac9db
NB		 3175 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3176 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3177 TMR_FUNCTION_REJECTED;
3178 break;
5c6cd613 3179 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3180 tmr->response = TMR_FUNCTION_REJECTED;
3181 break;
5c6cd613 3182 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3183 tmr->response = TMR_FUNCTION_REJECTED;
3184 break;
c66ac9db 3185 default:
6708bb27 3186 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3187 tmr->function);
3188 tmr->response = TMR_FUNCTION_REJECTED;
3189 break;
3190 }
3191
3192 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 3193 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3194
b7b8bef7 3195 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3196 return 0;
3197}
3198
c66ac9db
NB		 3199/* transport_processing_thread():
3200 *
3201 *
3202 */
3203static int transport_processing_thread(void *param)
3204{
5951146d 3205 int ret;
c66ac9db 3206 struct se_cmd *cmd;
8359cf43 3207 struct se_device *dev = param;
c66ac9db 3208
c66ac9db 3209 while (!kthread_should_stop()) {
e3d6f909
AG		 3210 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
3211 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 3212 kthread_should_stop());
3213 if (ret < 0)
3214 goto out;
3215
c66ac9db 3216get_cmd:
5951146d
AG		 3217 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
3218 if (!cmd)
c66ac9db
NB		 3219 continue;
3220
5951146d 3221 switch (cmd->t_state) {
680b73c5
CH		 3222 case TRANSPORT_NEW_CMD:
3223 BUG();
3224 break;
c66ac9db
NB		 3225 case TRANSPORT_PROCESS_TMR:
3226 transport_generic_do_tmr(cmd);
3227 break;
c66ac9db 3228 default:
f2da9dbd
CH		 3229 pr_err("Unknown t_state: %d for ITT: 0x%08x "
3230 "i_state: %d on SE LUN: %u\n",
3231 cmd->t_state,
e3d6f909
AG		 3232 cmd->se_tfo->get_task_tag(cmd),
3233 cmd->se_tfo->get_cmd_state(cmd),
3234 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 3235 BUG();
3236 }
3237
3238 goto get_cmd;
3239 }
3240
3241out:
cf572a96 3242 WARN_ON(!list_empty(&dev->state_list));
ce8762f6 3243 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 3244 dev->process_thread = NULL;
3245 return 0;
3246}
Linux kernel - Deliverables
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