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tcm_loop: switch to using transport_handle_cdb_direct
[GitHub/exynos8895/android_kernel_samsung_universal8895.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>
c66ac9db
NB		 40#include <asm/unaligned.h>
41#include <net/sock.h>
42#include <net/tcp.h>
43#include <scsi/scsi.h>
44#include <scsi/scsi_cmnd.h>
e66ecd50 45#include <scsi/scsi_tcq.h>
c66ac9db
NB		 46
47#include <target/target_core_base.h>
c4795fb2
CH		 48#include <target/target_core_backend.h>
49#include <target/target_core_fabric.h>
c66ac9db
NB		 50#include <target/target_core_configfs.h>
51
e26d99ae 52#include "target_core_internal.h"
c66ac9db 53#include "target_core_alua.h"
c66ac9db 54#include "target_core_pr.h"
c66ac9db
NB		 55#include "target_core_ua.h"
56
e3d6f909 57static int sub_api_initialized;
c66ac9db 58
35e0e757 59static struct workqueue_struct *target_completion_wq;
c66ac9db 60static struct kmem_cache *se_sess_cache;
c66ac9db 61struct kmem_cache *se_ua_cache;
c66ac9db
NB		 62struct kmem_cache *t10_pr_reg_cache;
63struct kmem_cache *t10_alua_lu_gp_cache;
64struct kmem_cache *t10_alua_lu_gp_mem_cache;
65struct kmem_cache *t10_alua_tg_pt_gp_cache;
66struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
67
c66ac9db 68static int transport_generic_write_pending(struct se_cmd *);
5951146d 69static int transport_processing_thread(void *param);
4d2300cc 70static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
c66ac9db 71static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 72static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 73 struct se_device *dev);
c66ac9db 74static void transport_free_dev_tasks(struct se_cmd *cmd);
05d1c7c0 75static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 76static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 77static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 78static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
03e98c9e 79static void transport_generic_request_failure(struct se_cmd *);
35e0e757 80static void target_complete_ok_work(struct work_struct *work);
c66ac9db 81
e3d6f909 82int init_se_kmem_caches(void)
c66ac9db 83{
c66ac9db
NB		 84 se_sess_cache = kmem_cache_create("se_sess_cache",
85 sizeof(struct se_session), __alignof__(struct se_session),
86 0, NULL);
6708bb27
AG		 87 if (!se_sess_cache) {
88 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 89 " failed\n");
c8e31f26 90 goto out;
c66ac9db
NB		 91 }
92 se_ua_cache = kmem_cache_create("se_ua_cache",
93 sizeof(struct se_ua), __alignof__(struct se_ua),
94 0, NULL);
6708bb27
AG		 95 if (!se_ua_cache) {
96 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 97 goto out_free_sess_cache;
c66ac9db 98 }
c66ac9db
NB		 99 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
100 sizeof(struct t10_pr_registration),
101 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 102 if (!t10_pr_reg_cache) {
103 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 104 " failed\n");
35e0e757 105 goto out_free_ua_cache;
c66ac9db
NB		 106 }
107 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
108 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
109 0, NULL);
6708bb27
AG		 110 if (!t10_alua_lu_gp_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 112 " failed\n");
35e0e757 113 goto out_free_pr_reg_cache;
c66ac9db
NB		 114 }
115 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
116 sizeof(struct t10_alua_lu_gp_member),
117 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 118 if (!t10_alua_lu_gp_mem_cache) {
119 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 120 "cache failed\n");
35e0e757 121 goto out_free_lu_gp_cache;
c66ac9db
NB		 122 }
123 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
124 sizeof(struct t10_alua_tg_pt_gp),
125 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 126 if (!t10_alua_tg_pt_gp_cache) {
127 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 128 "cache failed\n");
35e0e757 129 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 130 }
131 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
132 "t10_alua_tg_pt_gp_mem_cache",
133 sizeof(struct t10_alua_tg_pt_gp_member),
134 __alignof__(struct t10_alua_tg_pt_gp_member),
135 0, NULL);
6708bb27
AG		 136 if (!t10_alua_tg_pt_gp_mem_cache) {
137 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 138 "mem_t failed\n");
35e0e757 139 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 140 }
141
35e0e757
CH		 142 target_completion_wq = alloc_workqueue("target_completion",
143 WQ_MEM_RECLAIM, 0);
144 if (!target_completion_wq)
145 goto out_free_tg_pt_gp_mem_cache;
146
c66ac9db 147 return 0;
35e0e757
CH		 148
149out_free_tg_pt_gp_mem_cache:
150 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
151out_free_tg_pt_gp_cache:
152 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
153out_free_lu_gp_mem_cache:
154 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
155out_free_lu_gp_cache:
156 kmem_cache_destroy(t10_alua_lu_gp_cache);
157out_free_pr_reg_cache:
158 kmem_cache_destroy(t10_pr_reg_cache);
159out_free_ua_cache:
160 kmem_cache_destroy(se_ua_cache);
161out_free_sess_cache:
162 kmem_cache_destroy(se_sess_cache);
c66ac9db 163out:
e3d6f909 164 return -ENOMEM;
c66ac9db
NB		 165}
166
e3d6f909 167void release_se_kmem_caches(void)
c66ac9db 168{
35e0e757 169 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 170 kmem_cache_destroy(se_sess_cache);
171 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 172 kmem_cache_destroy(t10_pr_reg_cache);
173 kmem_cache_destroy(t10_alua_lu_gp_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
176 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 177}
178
e3d6f909
AG		 179/* This code ensures unique mib indexes are handed out. */
180static DEFINE_SPINLOCK(scsi_mib_index_lock);
181static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 182
183/*
184 * Allocate a new row index for the entry type specified
185 */
186u32 scsi_get_new_index(scsi_index_t type)
187{
188 u32 new_index;
189
e3d6f909 190 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 191
e3d6f909
AG		 192 spin_lock(&scsi_mib_index_lock);
193 new_index = ++scsi_mib_index[type];
194 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 195
196 return new_index;
197}
198
e26d99ae 199static void transport_init_queue_obj(struct se_queue_obj *qobj)
c66ac9db
NB		 200{
201 atomic_set(&qobj->queue_cnt, 0);
202 INIT_LIST_HEAD(&qobj->qobj_list);
203 init_waitqueue_head(&qobj->thread_wq);
204 spin_lock_init(&qobj->cmd_queue_lock);
205}
c66ac9db 206
dbc5623e 207void transport_subsystem_check_init(void)
c66ac9db
NB		 208{
209 int ret;
210
dbc5623e
NB		 211 if (sub_api_initialized)
212 return;
213
c66ac9db
NB		 214 ret = request_module("target_core_iblock");
215 if (ret != 0)
6708bb27 216 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 217
218 ret = request_module("target_core_file");
219 if (ret != 0)
6708bb27 220 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 221
222 ret = request_module("target_core_pscsi");
223 if (ret != 0)
6708bb27 224 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 225
226 ret = request_module("target_core_stgt");
227 if (ret != 0)
6708bb27 228 pr_err("Unable to load target_core_stgt\n");
c66ac9db 229
e3d6f909 230 sub_api_initialized = 1;
dbc5623e 231 return;
c66ac9db
NB		 232}
233
234struct se_session *transport_init_session(void)
235{
236 struct se_session *se_sess;
237
238 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 239 if (!se_sess) {
240 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 241 " se_sess_cache\n");
242 return ERR_PTR(-ENOMEM);
243 }
244 INIT_LIST_HEAD(&se_sess->sess_list);
245 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d
NB		 246 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
247 INIT_LIST_HEAD(&se_sess->sess_wait_list);
248 spin_lock_init(&se_sess->sess_cmd_lock);
c66ac9db
NB		 249
250 return se_sess;
251}
252EXPORT_SYMBOL(transport_init_session);
253
254/*
255 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
256 */
257void __transport_register_session(
258 struct se_portal_group *se_tpg,
259 struct se_node_acl *se_nacl,
260 struct se_session *se_sess,
261 void *fabric_sess_ptr)
262{
263 unsigned char buf[PR_REG_ISID_LEN];
264
265 se_sess->se_tpg = se_tpg;
266 se_sess->fabric_sess_ptr = fabric_sess_ptr;
267 /*
268 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
269 *
270 * Only set for struct se_session's that will actually be moving I/O.
271 * eg: *NOT* discovery sessions.
272 */
273 if (se_nacl) {
274 /*
275 * If the fabric module supports an ISID based TransportID,
276 * save this value in binary from the fabric I_T Nexus now.
277 */
e3d6f909 278 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 279 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 280 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 281 &buf[0], PR_REG_ISID_LEN);
282 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
283 }
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{
308 spin_lock_bh(&se_tpg->session_lock);
309 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
310 spin_unlock_bh(&se_tpg->session_lock);
311}
312EXPORT_SYMBOL(transport_register_session);
313
314void transport_deregister_session_configfs(struct se_session *se_sess)
315{
316 struct se_node_acl *se_nacl;
23388864 317 unsigned long flags;
c66ac9db
NB		 318 /*
319 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
320 */
321 se_nacl = se_sess->se_node_acl;
6708bb27 322 if (se_nacl) {
23388864 323 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 324 list_del(&se_sess->sess_acl_list);
325 /*
326 * If the session list is empty, then clear the pointer.
327 * Otherwise, set the struct se_session pointer from the tail
328 * element of the per struct se_node_acl active session list.
329 */
330 if (list_empty(&se_nacl->acl_sess_list))
331 se_nacl->nacl_sess = NULL;
332 else {
333 se_nacl->nacl_sess = container_of(
334 se_nacl->acl_sess_list.prev,
335 struct se_session, sess_acl_list);
336 }
23388864 337 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 338 }
339}
340EXPORT_SYMBOL(transport_deregister_session_configfs);
341
342void transport_free_session(struct se_session *se_sess)
343{
344 kmem_cache_free(se_sess_cache, se_sess);
345}
346EXPORT_SYMBOL(transport_free_session);
347
348void transport_deregister_session(struct se_session *se_sess)
349{
350 struct se_portal_group *se_tpg = se_sess->se_tpg;
351 struct se_node_acl *se_nacl;
e63a8e19 352 unsigned long flags;
c66ac9db 353
6708bb27 354 if (!se_tpg) {
c66ac9db
NB		 355 transport_free_session(se_sess);
356 return;
357 }
c66ac9db 358
e63a8e19 359 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 360 list_del(&se_sess->sess_list);
361 se_sess->se_tpg = NULL;
362 se_sess->fabric_sess_ptr = NULL;
e63a8e19 363 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 364
365 /*
366 * Determine if we need to do extra work for this initiator node's
367 * struct se_node_acl if it had been previously dynamically generated.
368 */
369 se_nacl = se_sess->se_node_acl;
6708bb27 370 if (se_nacl) {
e63a8e19 371 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 372 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 373 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
374 se_tpg)) {
c66ac9db
NB		 375 list_del(&se_nacl->acl_list);
376 se_tpg->num_node_acls--;
e63a8e19 377 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 378
379 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 380 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 381 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 382 se_nacl);
e63a8e19 383 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 384 }
385 }
e63a8e19 386 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 387 }
388
389 transport_free_session(se_sess);
390
6708bb27 391 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 392 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 393}
394EXPORT_SYMBOL(transport_deregister_session);
395
396/*
a1d8b49a 397 * Called with cmd->t_state_lock held.
c66ac9db
NB		 398 */
399static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
400{
42bf829e 401 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 402 struct se_task *task;
403 unsigned long flags;
404
42bf829e
CH		 405 if (!dev)
406 return;
c66ac9db 407
42bf829e 408 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 409 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 410 continue;
411
c66ac9db 412 spin_lock_irqsave(&dev->execute_task_lock, flags);
1880807a
CH		 413 if (task->t_state_active) {
414 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
415 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db 416
1880807a
CH		 417 list_del(&task->t_state_list);
418 atomic_dec(&cmd->t_task_cdbs_ex_left);
419 task->t_state_active = false;
420 }
421 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db 422 }
1880807a 423
c66ac9db
NB		 424}
425
426/* transport_cmd_check_stop():
427 *
7d680f3b 428 * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
c66ac9db
NB		 429 * 'transport_off = 2' determines if task_dev_state should be removed.
430 *
431 * A non-zero u8 t_state sets cmd->t_state.
432 * Returns 1 when command is stopped, else 0.
433 */
434static int transport_cmd_check_stop(
435 struct se_cmd *cmd,
436 int transport_off,
437 u8 t_state)
438{
439 unsigned long flags;
440
a1d8b49a 441 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 442 /*
443 * Determine if IOCTL context caller in requesting the stopping of this
444 * command for LUN shutdown purposes.
445 */
7d680f3b
CH		 446 if (cmd->transport_state & CMD_T_LUN_STOP) {
447 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
448 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 449
7d680f3b 450 cmd->transport_state &= ~CMD_T_ACTIVE;
c66ac9db
NB		 451 if (transport_off == 2)
452 transport_all_task_dev_remove_state(cmd);
a1d8b49a 453 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 454
a1d8b49a 455 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 456 return 1;
457 }
458 /*
459 * Determine if frontend context caller is requesting the stopping of
e3d6f909 460 * this command for frontend exceptions.
c66ac9db 461 */
7d680f3b
CH		 462 if (cmd->transport_state & CMD_T_STOP) {
463 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
464 __func__, __LINE__,
e3d6f909 465 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 466
c66ac9db
NB		 467 if (transport_off == 2)
468 transport_all_task_dev_remove_state(cmd);
469
470 /*
471 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
472 * to FE.
473 */
474 if (transport_off == 2)
475 cmd->se_lun = NULL;
a1d8b49a 476 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 477
a1d8b49a 478 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 479 return 1;
480 }
481 if (transport_off) {
7d680f3b 482 cmd->transport_state &= ~CMD_T_ACTIVE;
c66ac9db
NB		 483 if (transport_off == 2) {
484 transport_all_task_dev_remove_state(cmd);
485 /*
486 * Clear struct se_cmd->se_lun before the transport_off == 2
487 * handoff to fabric module.
488 */
489 cmd->se_lun = NULL;
490 /*
491 * Some fabric modules like tcm_loop can release
25985edc 492 * their internally allocated I/O reference now and
c66ac9db 493 * struct se_cmd now.
88dd9e26
NB		 494 *
495 * Fabric modules are expected to return '1' here if the
496 * se_cmd being passed is released at this point,
497 * or zero if not being released.
c66ac9db 498 */
e3d6f909 499 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 500 spin_unlock_irqrestore(
a1d8b49a 501 &cmd->t_state_lock, flags);
c66ac9db 502
88dd9e26 503 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 504 }
505 }
a1d8b49a 506 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 507
508 return 0;
509 } else if (t_state)
510 cmd->t_state = t_state;
a1d8b49a 511 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 512
513 return 0;
514}
515
516static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
517{
518 return transport_cmd_check_stop(cmd, 2, 0);
519}
520
521static void transport_lun_remove_cmd(struct se_cmd *cmd)
522{
e3d6f909 523 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 524 unsigned long flags;
525
526 if (!lun)
527 return;
528
a1d8b49a 529 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 530 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
531 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
532 transport_all_task_dev_remove_state(cmd);
c66ac9db 533 }
a1d8b49a 534 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 535
c66ac9db 536 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 537 if (!list_empty(&cmd->se_lun_node))
538 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 539 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
540}
541
542void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
543{
c8e31f26 544 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
8dc52b54 545 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 546
547 if (transport_cmd_check_stop_to_fabric(cmd))
548 return;
77039d1e 549 if (remove) {
3df8d40b 550 transport_remove_cmd_from_queue(cmd);
e6a2573f 551 transport_put_cmd(cmd);
77039d1e 552 }
c66ac9db
NB		 553}
554
f7a5cc0b
CH		 555static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
556 bool at_head)
c66ac9db
NB		 557{
558 struct se_device *dev = cmd->se_dev;
e3d6f909 559 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 560 unsigned long flags;
561
c66ac9db 562 if (t_state) {
a1d8b49a 563 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 564 cmd->t_state = t_state;
7d680f3b 565 cmd->transport_state |= CMD_T_ACTIVE;
a1d8b49a 566 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 567 }
568
569 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 570
571 /* If the cmd is already on the list, remove it before we add it */
572 if (!list_empty(&cmd->se_queue_node))
573 list_del(&cmd->se_queue_node);
574 else
575 atomic_inc(&qobj->queue_cnt);
576
f7a5cc0b 577 if (at_head)
07bde79a 578 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 579 else
07bde79a 580 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
7d680f3b 581 cmd->transport_state |= CMD_T_QUEUED;
c66ac9db
NB		 582 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
583
c66ac9db 584 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 585}
586
5951146d
AG		 587static struct se_cmd *
588transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 589{
5951146d 590 struct se_cmd *cmd;
c66ac9db
NB		 591 unsigned long flags;
592
593 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
594 if (list_empty(&qobj->qobj_list)) {
595 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
596 return NULL;
597 }
5951146d 598 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 599
7d680f3b 600 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2 601 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 602 atomic_dec(&qobj->queue_cnt);
603 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
604
5951146d 605 return cmd;
c66ac9db
NB		 606}
607
3df8d40b 608static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 609{
3df8d40b 610 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 611 unsigned long flags;
612
613 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
7d680f3b 614 if (!(cmd->transport_state & CMD_T_QUEUED)) {
c66ac9db
NB		 615 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
616 return;
617 }
7d680f3b 618 cmd->transport_state &= ~CMD_T_QUEUED;
79a7fef2
RD		 619 atomic_dec(&qobj->queue_cnt);
620 list_del_init(&cmd->se_queue_node);
c66ac9db 621 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
c66ac9db
NB		 622}
623
624/*
625 * Completion function used by TCM subsystem plugins (such as FILEIO)
626 * for queueing up response from struct se_subsystem_api->do_task()
627 */
628void transport_complete_sync_cache(struct se_cmd *cmd, int good)
629{
a1d8b49a 630 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 631 struct se_task, t_list);
632
633 if (good) {
634 cmd->scsi_status = SAM_STAT_GOOD;
635 task->task_scsi_status = GOOD;
636 } else {
637 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
03e98c9e
NB		 638 task->task_se_cmd->scsi_sense_reason =
639 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
640
c66ac9db
NB		 641 }
642
643 transport_complete_task(task, good);
644}
645EXPORT_SYMBOL(transport_complete_sync_cache);
646
35e0e757
CH		 647static void target_complete_failure_work(struct work_struct *work)
648{
649 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
650
03e98c9e 651 transport_generic_request_failure(cmd);
35e0e757
CH		 652}
653
c66ac9db
NB		 654/* transport_complete_task():
655 *
656 * Called from interrupt and non interrupt context depending
657 * on the transport plugin.
658 */
659void transport_complete_task(struct se_task *task, int success)
660{
e3d6f909 661 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 662 struct se_device *dev = cmd->se_dev;
c66ac9db 663 unsigned long flags;
c66ac9db 664
a1d8b49a 665 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 666 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 667
668 /*
669 * See if any sense data exists, if so set the TASK_SENSE flag.
670 * Also check for any other post completion work that needs to be
671 * done by the plugins.
672 */
673 if (dev && dev->transport->transport_complete) {
674 if (dev->transport->transport_complete(task) != 0) {
675 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
ef804a84 676 task->task_flags |= TF_HAS_SENSE;
c66ac9db
NB		 677 success = 1;
678 }
679 }
680
681 /*
682 * See if we are waiting for outstanding struct se_task
683 * to complete for an exception condition
684 */
6c76bf95 685 if (task->task_flags & TF_REQUEST_STOP) {
a1d8b49a 686 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 687 complete(&task->task_stop_comp);
688 return;
689 }
2235007c
CH		 690
691 if (!success)
7d680f3b 692 cmd->transport_state |= CMD_T_FAILED;
2235007c 693
c66ac9db
NB		 694 /*
695 * Decrement the outstanding t_task_cdbs_left count. The last
696 * struct se_task from struct se_cmd will complete itself into the
697 * device queue depending upon int success.
698 */
6708bb27 699 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
a1d8b49a 700 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 701 return;
702 }
703
7d680f3b 704 if (cmd->transport_state & CMD_T_FAILED) {
41e16e98 705 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
35e0e757 706 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 707 } else {
7d680f3b 708 cmd->transport_state |= CMD_T_COMPLETE;
35e0e757 709 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 710 }
35e0e757 711
35e0e757 712 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b 713 cmd->transport_state |= CMD_T_ACTIVE;
a1d8b49a 714 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 715
35e0e757 716 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 717}
718EXPORT_SYMBOL(transport_complete_task);
719
720/*
721 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
722 * struct se_task list are ready to be added to the active execution list
723 * struct se_device
724
725 * Called with se_dev_t->execute_task_lock called.
726 */
727static inline int transport_add_task_check_sam_attr(
728 struct se_task *task,
729 struct se_task *task_prev,
730 struct se_device *dev)
731{
732 /*
733 * No SAM Task attribute emulation enabled, add to tail of
734 * execution queue
735 */
736 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
737 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
738 return 0;
739 }
740 /*
741 * HEAD_OF_QUEUE attribute for received CDB, which means
742 * the first task that is associated with a struct se_cmd goes to
743 * head of the struct se_device->execute_task_list, and task_prev
744 * after that for each subsequent task
745 */
e66ecd50 746 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 747 list_add(&task->t_execute_list,
748 (task_prev != NULL) ?
749 &task_prev->t_execute_list :
750 &dev->execute_task_list);
751
6708bb27 752 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 753 " in execution queue\n",
6708bb27 754 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 755 return 1;
756 }
757 /*
758 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
759 * transitioned from Dermant -> Active state, and are added to the end
760 * of the struct se_device->execute_task_list
761 */
762 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
763 return 0;
764}
765
766/* __transport_add_task_to_execute_queue():
767 *
768 * Called with se_dev_t->execute_task_lock called.
769 */
770static void __transport_add_task_to_execute_queue(
771 struct se_task *task,
772 struct se_task *task_prev,
773 struct se_device *dev)
774{
775 int head_of_queue;
776
777 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
778 atomic_inc(&dev->execute_tasks);
779
1880807a 780 if (task->t_state_active)
c66ac9db
NB		 781 return;
782 /*
783 * Determine if this task needs to go to HEAD_OF_QUEUE for the
784 * state list as well. Running with SAM Task Attribute emulation
785 * will always return head_of_queue == 0 here
786 */
787 if (head_of_queue)
788 list_add(&task->t_state_list, (task_prev) ?
789 &task_prev->t_state_list :
790 &dev->state_task_list);
791 else
792 list_add_tail(&task->t_state_list, &dev->state_task_list);
793
1880807a 794 task->t_state_active = true;
c66ac9db 795
6708bb27 796 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 797 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 798 task, dev);
799}
800
801static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
802{
42bf829e 803 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 804 struct se_task *task;
805 unsigned long flags;
806
a1d8b49a
AG		 807 spin_lock_irqsave(&cmd->t_state_lock, flags);
808 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db 809 spin_lock(&dev->execute_task_lock);
1880807a
CH		 810 if (!task->t_state_active) {
811 list_add_tail(&task->t_state_list,
812 &dev->state_task_list);
813 task->t_state_active = true;
814
815 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
816 task->task_se_cmd->se_tfo->get_task_tag(
817 task->task_se_cmd), task, dev);
818 }
c66ac9db
NB		 819 spin_unlock(&dev->execute_task_lock);
820 }
a1d8b49a 821 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 822}
823
4d2300cc 824static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
c66ac9db 825{
5951146d 826 struct se_device *dev = cmd->se_dev;
c66ac9db 827 struct se_task *task, *task_prev = NULL;
c66ac9db 828
a1d8b49a 829 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 830 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 831 continue;
832 /*
833 * __transport_add_task_to_execute_queue() handles the
834 * SAM Task Attribute emulation if enabled
835 */
836 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 837 task_prev = task;
838 }
4d2300cc
NB		 839}
840
841static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
842{
843 unsigned long flags;
844 struct se_device *dev = cmd->se_dev;
845
846 spin_lock_irqsave(&dev->execute_task_lock, flags);
847 __transport_add_tasks_from_cmd(cmd);
c66ac9db 848 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 849}
850
04629b7b
CH		 851void __transport_remove_task_from_execute_queue(struct se_task *task,
852 struct se_device *dev)
853{
854 list_del_init(&task->t_execute_list);
855 atomic_dec(&dev->execute_tasks);
856}
857
e26d99ae 858static void transport_remove_task_from_execute_queue(
c66ac9db
NB		 859 struct se_task *task,
860 struct se_device *dev)
861{
862 unsigned long flags;
863
04629b7b 864 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 865 return;
af57c3ac 866
c66ac9db 867 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 868 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 869 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
870}
871
07bde79a 872/*
f147abb4 873 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 874 */
875
876static void target_qf_do_work(struct work_struct *work)
877{
878 struct se_device *dev = container_of(work, struct se_device,
879 qf_work_queue);
bcac364a 880 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 881 struct se_cmd *cmd, *cmd_tmp;
882
883 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 884 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
885 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 886
bcac364a 887 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 888 list_del(&cmd->se_qf_node);
889 atomic_dec(&dev->dev_qf_count);
890 smp_mb__after_atomic_dec();
07bde79a 891
6708bb27 892 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 893 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 894 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 895 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
896 : "UNKNOWN");
f7a5cc0b
CH		 897
898 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 899 }
07bde79a
NB		 900}
901
c66ac9db
NB		 902unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
903{
904 switch (cmd->data_direction) {
905 case DMA_NONE:
906 return "NONE";
907 case DMA_FROM_DEVICE:
908 return "READ";
909 case DMA_TO_DEVICE:
910 return "WRITE";
911 case DMA_BIDIRECTIONAL:
912 return "BIDI";
913 default:
914 break;
915 }
916
917 return "UNKNOWN";
918}
919
920void transport_dump_dev_state(
921 struct se_device *dev,
922 char *b,
923 int *bl)
924{
925 *bl += sprintf(b + *bl, "Status: ");
926 switch (dev->dev_status) {
927 case TRANSPORT_DEVICE_ACTIVATED:
928 *bl += sprintf(b + *bl, "ACTIVATED");
929 break;
930 case TRANSPORT_DEVICE_DEACTIVATED:
931 *bl += sprintf(b + *bl, "DEACTIVATED");
932 break;
933 case TRANSPORT_DEVICE_SHUTDOWN:
934 *bl += sprintf(b + *bl, "SHUTDOWN");
935 break;
936 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
937 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
938 *bl += sprintf(b + *bl, "OFFLINE");
939 break;
940 default:
941 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
942 break;
943 }
944
65586d51
NB		 945 *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d",
946 atomic_read(&dev->execute_tasks), dev->queue_depth);
c66ac9db 947 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 948 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 949 *bl += sprintf(b + *bl, " ");
950}
951
c66ac9db
NB		 952void transport_dump_vpd_proto_id(
953 struct t10_vpd *vpd,
954 unsigned char *p_buf,
955 int p_buf_len)
956{
957 unsigned char buf[VPD_TMP_BUF_SIZE];
958 int len;
959
960 memset(buf, 0, VPD_TMP_BUF_SIZE);
961 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
962
963 switch (vpd->protocol_identifier) {
964 case 0x00:
965 sprintf(buf+len, "Fibre Channel\n");
966 break;
967 case 0x10:
968 sprintf(buf+len, "Parallel SCSI\n");
969 break;
970 case 0x20:
971 sprintf(buf+len, "SSA\n");
972 break;
973 case 0x30:
974 sprintf(buf+len, "IEEE 1394\n");
975 break;
976 case 0x40:
977 sprintf(buf+len, "SCSI Remote Direct Memory Access"
978 " Protocol\n");
979 break;
980 case 0x50:
981 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
982 break;
983 case 0x60:
984 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
985 break;
986 case 0x70:
987 sprintf(buf+len, "Automation/Drive Interface Transport"
988 " Protocol\n");
989 break;
990 case 0x80:
991 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
992 break;
993 default:
994 sprintf(buf+len, "Unknown 0x%02x\n",
995 vpd->protocol_identifier);
996 break;
997 }
998
999 if (p_buf)
1000 strncpy(p_buf, buf, p_buf_len);
1001 else
6708bb27 1002 pr_debug("%s", buf);
c66ac9db
NB		 1003}
1004
1005void
1006transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1007{
1008 /*
1009 * Check if the Protocol Identifier Valid (PIV) bit is set..
1010 *
1011 * from spc3r23.pdf section 7.5.1
1012 */
1013 if (page_83[1] & 0x80) {
1014 vpd->protocol_identifier = (page_83[0] & 0xf0);
1015 vpd->protocol_identifier_set = 1;
1016 transport_dump_vpd_proto_id(vpd, NULL, 0);
1017 }
1018}
1019EXPORT_SYMBOL(transport_set_vpd_proto_id);
1020
1021int transport_dump_vpd_assoc(
1022 struct t10_vpd *vpd,
1023 unsigned char *p_buf,
1024 int p_buf_len)
1025{
1026 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1027 int ret = 0;
1028 int len;
c66ac9db
NB		 1029
1030 memset(buf, 0, VPD_TMP_BUF_SIZE);
1031 len = sprintf(buf, "T10 VPD Identifier Association: ");
1032
1033 switch (vpd->association) {
1034 case 0x00:
1035 sprintf(buf+len, "addressed logical unit\n");
1036 break;
1037 case 0x10:
1038 sprintf(buf+len, "target port\n");
1039 break;
1040 case 0x20:
1041 sprintf(buf+len, "SCSI target device\n");
1042 break;
1043 default:
1044 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1045 ret = -EINVAL;
c66ac9db
NB		 1046 break;
1047 }
1048
1049 if (p_buf)
1050 strncpy(p_buf, buf, p_buf_len);
1051 else
6708bb27 1052 pr_debug("%s", buf);
c66ac9db
NB		 1053
1054 return ret;
1055}
1056
1057int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1058{
1059 /*
1060 * The VPD identification association..
1061 *
1062 * from spc3r23.pdf Section 7.6.3.1 Table 297
1063 */
1064 vpd->association = (page_83[1] & 0x30);
1065 return transport_dump_vpd_assoc(vpd, NULL, 0);
1066}
1067EXPORT_SYMBOL(transport_set_vpd_assoc);
1068
1069int transport_dump_vpd_ident_type(
1070 struct t10_vpd *vpd,
1071 unsigned char *p_buf,
1072 int p_buf_len)
1073{
1074 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1075 int ret = 0;
1076 int len;
c66ac9db
NB		 1077
1078 memset(buf, 0, VPD_TMP_BUF_SIZE);
1079 len = sprintf(buf, "T10 VPD Identifier Type: ");
1080
1081 switch (vpd->device_identifier_type) {
1082 case 0x00:
1083 sprintf(buf+len, "Vendor specific\n");
1084 break;
1085 case 0x01:
1086 sprintf(buf+len, "T10 Vendor ID based\n");
1087 break;
1088 case 0x02:
1089 sprintf(buf+len, "EUI-64 based\n");
1090 break;
1091 case 0x03:
1092 sprintf(buf+len, "NAA\n");
1093 break;
1094 case 0x04:
1095 sprintf(buf+len, "Relative target port identifier\n");
1096 break;
1097 case 0x08:
1098 sprintf(buf+len, "SCSI name string\n");
1099 break;
1100 default:
1101 sprintf(buf+len, "Unsupported: 0x%02x\n",
1102 vpd->device_identifier_type);
e3d6f909 1103 ret = -EINVAL;
c66ac9db
NB		 1104 break;
1105 }
1106
e3d6f909
AG		 1107 if (p_buf) {
1108 if (p_buf_len < strlen(buf)+1)
1109 return -EINVAL;
c66ac9db 1110 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1111 } else {
6708bb27 1112 pr_debug("%s", buf);
e3d6f909 1113 }
c66ac9db
NB		 1114
1115 return ret;
1116}
1117
1118int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1119{
1120 /*
1121 * The VPD identifier type..
1122 *
1123 * from spc3r23.pdf Section 7.6.3.1 Table 298
1124 */
1125 vpd->device_identifier_type = (page_83[1] & 0x0f);
1126 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1127}
1128EXPORT_SYMBOL(transport_set_vpd_ident_type);
1129
1130int transport_dump_vpd_ident(
1131 struct t10_vpd *vpd,
1132 unsigned char *p_buf,
1133 int p_buf_len)
1134{
1135 unsigned char buf[VPD_TMP_BUF_SIZE];
1136 int ret = 0;
1137
1138 memset(buf, 0, VPD_TMP_BUF_SIZE);
1139
1140 switch (vpd->device_identifier_code_set) {
1141 case 0x01: /* Binary */
1142 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1143 &vpd->device_identifier[0]);
1144 break;
1145 case 0x02: /* ASCII */
1146 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1147 &vpd->device_identifier[0]);
1148 break;
1149 case 0x03: /* UTF-8 */
1150 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1151 &vpd->device_identifier[0]);
1152 break;
1153 default:
1154 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1155 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1156 ret = -EINVAL;
c66ac9db
NB		 1157 break;
1158 }
1159
1160 if (p_buf)
1161 strncpy(p_buf, buf, p_buf_len);
1162 else
6708bb27 1163 pr_debug("%s", buf);
c66ac9db
NB		 1164
1165 return ret;
1166}
1167
1168int
1169transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1170{
1171 static const char hex_str[] = "0123456789abcdef";
1172 int j = 0, i = 4; /* offset to start of the identifer */
1173
1174 /*
1175 * The VPD Code Set (encoding)
1176 *
1177 * from spc3r23.pdf Section 7.6.3.1 Table 296
1178 */
1179 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1180 switch (vpd->device_identifier_code_set) {
1181 case 0x01: /* Binary */
1182 vpd->device_identifier[j++] =
1183 hex_str[vpd->device_identifier_type];
1184 while (i < (4 + page_83[3])) {
1185 vpd->device_identifier[j++] =
1186 hex_str[(page_83[i] & 0xf0) >> 4];
1187 vpd->device_identifier[j++] =
1188 hex_str[page_83[i] & 0x0f];
1189 i++;
1190 }
1191 break;
1192 case 0x02: /* ASCII */
1193 case 0x03: /* UTF-8 */
1194 while (i < (4 + page_83[3]))
1195 vpd->device_identifier[j++] = page_83[i++];
1196 break;
1197 default:
1198 break;
1199 }
1200
1201 return transport_dump_vpd_ident(vpd, NULL, 0);
1202}
1203EXPORT_SYMBOL(transport_set_vpd_ident);
1204
1205static void core_setup_task_attr_emulation(struct se_device *dev)
1206{
1207 /*
1208 * If this device is from Target_Core_Mod/pSCSI, disable the
1209 * SAM Task Attribute emulation.
1210 *
1211 * This is currently not available in upsream Linux/SCSI Target
1212 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1213 */
e3d6f909 1214 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1215 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1216 return;
1217 }
1218
1219 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1220 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1221 " device\n", dev->transport->name,
1222 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1223}
1224
1225static void scsi_dump_inquiry(struct se_device *dev)
1226{
e3d6f909 1227 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
e59a41b6 1228 char buf[17];
c66ac9db
NB		 1229 int i, device_type;
1230 /*
1231 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1232 */
c66ac9db
NB		 1233 for (i = 0; i < 8; i++)
1234 if (wwn->vendor[i] >= 0x20)
e59a41b6 1235 buf[i] = wwn->vendor[i];
c66ac9db 1236 else
e59a41b6
SAS		 1237 buf[i] = ' ';
1238 buf[i] = '\0';
1239 pr_debug(" Vendor: %s\n", buf);
c66ac9db 1240
c66ac9db
NB		 1241 for (i = 0; i < 16; i++)
1242 if (wwn->model[i] >= 0x20)
e59a41b6 1243 buf[i] = wwn->model[i];
c66ac9db 1244 else
e59a41b6
SAS		 1245 buf[i] = ' ';
1246 buf[i] = '\0';
1247 pr_debug(" Model: %s\n", buf);
c66ac9db 1248
c66ac9db
NB		 1249 for (i = 0; i < 4; i++)
1250 if (wwn->revision[i] >= 0x20)
e59a41b6 1251 buf[i] = wwn->revision[i];
c66ac9db 1252 else
e59a41b6
SAS		 1253 buf[i] = ' ';
1254 buf[i] = '\0';
1255 pr_debug(" Revision: %s\n", buf);
c66ac9db 1256
e3d6f909 1257 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1258 pr_debug(" Type: %s ", scsi_device_type(device_type));
1259 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1260 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1261}
1262
1263struct se_device *transport_add_device_to_core_hba(
1264 struct se_hba *hba,
1265 struct se_subsystem_api *transport,
1266 struct se_subsystem_dev *se_dev,
1267 u32 device_flags,
1268 void *transport_dev,
1269 struct se_dev_limits *dev_limits,
1270 const char *inquiry_prod,
1271 const char *inquiry_rev)
1272{
12a18bdc 1273 int force_pt;
c66ac9db
NB		 1274 struct se_device *dev;
1275
1276 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1277 if (!dev) {
1278 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1279 return NULL;
1280 }
c66ac9db 1281
e3d6f909 1282 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1283 dev->dev_flags = device_flags;
1284 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1285 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1286 dev->se_hba = hba;
1287 dev->se_sub_dev = se_dev;
1288 dev->transport = transport;
c66ac9db
NB		 1289 INIT_LIST_HEAD(&dev->dev_list);
1290 INIT_LIST_HEAD(&dev->dev_sep_list);
1291 INIT_LIST_HEAD(&dev->dev_tmr_list);
1292 INIT_LIST_HEAD(&dev->execute_task_list);
1293 INIT_LIST_HEAD(&dev->delayed_cmd_list);
c66ac9db 1294 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1295 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1296 spin_lock_init(&dev->execute_task_lock);
1297 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1298 spin_lock_init(&dev->dev_reservation_lock);
1299 spin_lock_init(&dev->dev_status_lock);
c66ac9db
NB		 1300 spin_lock_init(&dev->se_port_lock);
1301 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1302 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1303 atomic_set(&dev->dev_ordered_id, 0);
1304
1305 se_dev_set_default_attribs(dev, dev_limits);
1306
1307 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1308 dev->creation_time = get_jiffies_64();
1309 spin_lock_init(&dev->stats_lock);
1310
1311 spin_lock(&hba->device_lock);
1312 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1313 hba->dev_count++;
1314 spin_unlock(&hba->device_lock);
1315 /*
1316 * Setup the SAM Task Attribute emulation for struct se_device
1317 */
1318 core_setup_task_attr_emulation(dev);
1319 /*
1320 * Force PR and ALUA passthrough emulation with internal object use.
1321 */
1322 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1323 /*
1324 * Setup the Reservations infrastructure for struct se_device
1325 */
1326 core_setup_reservations(dev, force_pt);
1327 /*
1328 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1329 */
1330 if (core_setup_alua(dev, force_pt) < 0)
1331 goto out;
1332
1333 /*
1334 * Startup the struct se_device processing thread
1335 */
1336 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1337 "LIO_%s", dev->transport->name);
c66ac9db 1338 if (IS_ERR(dev->process_thread)) {
6708bb27 1339 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1340 dev->transport->name);
c66ac9db
NB		 1341 goto out;
1342 }
07bde79a
NB		 1343 /*
1344 * Setup work_queue for QUEUE_FULL
1345 */
1346 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1347 /*
1348 * Preload the initial INQUIRY const values if we are doing
1349 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1350 * passthrough because this is being provided by the backend LLD.
1351 * This is required so that transport_get_inquiry() copies these
1352 * originals once back into DEV_T10_WWN(dev) for the virtual device
1353 * setup.
1354 */
e3d6f909 1355 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1356 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1357 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1358 " INQUIRY consts\n");
1359 goto out;
1360 }
1361
e3d6f909
AG		 1362 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1363 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1364 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1365 }
1366 scsi_dump_inquiry(dev);
1367
12a18bdc 1368 return dev;
c66ac9db 1369out:
c66ac9db
NB		 1370 kthread_stop(dev->process_thread);
1371
1372 spin_lock(&hba->device_lock);
1373 list_del(&dev->dev_list);
1374 hba->dev_count--;
1375 spin_unlock(&hba->device_lock);
1376
1377 se_release_vpd_for_dev(dev);
1378
c66ac9db
NB		 1379 kfree(dev);
1380
1381 return NULL;
1382}
1383EXPORT_SYMBOL(transport_add_device_to_core_hba);
1384
1385/* transport_generic_prepare_cdb():
1386 *
1387 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1388 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1389 * The point of this is since we are mapping iSCSI LUNs to
1390 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1391 * devices and HBAs for a loop.
1392 */
1393static inline void transport_generic_prepare_cdb(
1394 unsigned char *cdb)
1395{
1396 switch (cdb[0]) {
1397 case READ_10: /* SBC - RDProtect */
1398 case READ_12: /* SBC - RDProtect */
1399 case READ_16: /* SBC - RDProtect */
1400 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1401 case VERIFY: /* SBC - VRProtect */
1402 case VERIFY_16: /* SBC - VRProtect */
1403 case WRITE_VERIFY: /* SBC - VRProtect */
1404 case WRITE_VERIFY_12: /* SBC - VRProtect */
1405 break;
1406 default:
1407 cdb[1] &= 0x1f; /* clear logical unit number */
1408 break;
1409 }
1410}
1411
1412static struct se_task *
1413transport_generic_get_task(struct se_cmd *cmd,
1414 enum dma_data_direction data_direction)
1415{
1416 struct se_task *task;
5951146d 1417 struct se_device *dev = cmd->se_dev;
c66ac9db 1418
6708bb27 1419 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1420 if (!task) {
6708bb27 1421 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1422 return NULL;
1423 }
1424
1425 INIT_LIST_HEAD(&task->t_list);
1426 INIT_LIST_HEAD(&task->t_execute_list);
1427 INIT_LIST_HEAD(&task->t_state_list);
1428 init_completion(&task->task_stop_comp);
c66ac9db 1429 task->task_se_cmd = cmd;
c66ac9db
NB		 1430 task->task_data_direction = data_direction;
1431
c66ac9db
NB		 1432 return task;
1433}
1434
1435static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1436
c66ac9db
NB		 1437/*
1438 * Used by fabric modules containing a local struct se_cmd within their
1439 * fabric dependent per I/O descriptor.
1440 */
1441void transport_init_se_cmd(
1442 struct se_cmd *cmd,
1443 struct target_core_fabric_ops *tfo,
1444 struct se_session *se_sess,
1445 u32 data_length,
1446 int data_direction,
1447 int task_attr,
1448 unsigned char *sense_buffer)
1449{
5951146d
AG		 1450 INIT_LIST_HEAD(&cmd->se_lun_node);
1451 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1452 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1453 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1454 INIT_LIST_HEAD(&cmd->se_cmd_list);
a1d8b49a
AG		 1455 INIT_LIST_HEAD(&cmd->t_task_list);
1456 init_completion(&cmd->transport_lun_fe_stop_comp);
1457 init_completion(&cmd->transport_lun_stop_comp);
1458 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1459 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1460 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1461 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1462
1463 cmd->se_tfo = tfo;
1464 cmd->se_sess = se_sess;
1465 cmd->data_length = data_length;
1466 cmd->data_direction = data_direction;
1467 cmd->sam_task_attr = task_attr;
1468 cmd->sense_buffer = sense_buffer;
1469}
1470EXPORT_SYMBOL(transport_init_se_cmd);
1471
1472static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1473{
1474 /*
1475 * Check if SAM Task Attribute emulation is enabled for this
1476 * struct se_device storage object
1477 */
5951146d 1478 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1479 return 0;
1480
e66ecd50 1481 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1482 pr_debug("SAM Task Attribute ACA"
c66ac9db 1483 " emulation is not supported\n");
e3d6f909 1484 return -EINVAL;
c66ac9db
NB		 1485 }
1486 /*
1487 * Used to determine when ORDERED commands should go from
1488 * Dormant to Active status.
1489 */
5951146d 1490 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1491 smp_mb__after_atomic_inc();
6708bb27 1492 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1493 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1494 cmd->se_dev->transport->name);
c66ac9db
NB		 1495 return 0;
1496}
1497
c66ac9db
NB		 1498/* transport_generic_allocate_tasks():
1499 *
1500 * Called from fabric RX Thread.
1501 */
1502int transport_generic_allocate_tasks(
1503 struct se_cmd *cmd,
1504 unsigned char *cdb)
1505{
1506 int ret;
1507
1508 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1509 /*
1510 * Ensure that the received CDB is less than the max (252 + 8) bytes
1511 * for VARIABLE_LENGTH_CMD
1512 */
1513 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1514 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1515 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1516 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1517 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1518 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1519 return -EINVAL;
c66ac9db
NB		 1520 }
1521 /*
1522 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1523 * allocate the additional extended CDB buffer now.. Otherwise
1524 * setup the pointer from __t_task_cdb to t_task_cdb.
1525 */
a1d8b49a
AG		 1526 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1527 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1528 GFP_KERNEL);
6708bb27
AG		 1529 if (!cmd->t_task_cdb) {
1530 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1531 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1532 scsi_command_size(cdb),
a1d8b49a 1533 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1534 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1535 cmd->scsi_sense_reason =
1536 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1537 return -ENOMEM;
c66ac9db
NB		 1538 }
1539 } else
a1d8b49a 1540 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1541 /*
a1d8b49a 1542 * Copy the original CDB into cmd->
c66ac9db 1543 */
a1d8b49a 1544 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1545 /*
1546 * Setup the received CDB based on SCSI defined opcodes and
1547 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1548 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1549 * pointer is expected to be setup before we reach this point.
1550 */
1551 ret = transport_generic_cmd_sequencer(cmd, cdb);
1552 if (ret < 0)
1553 return ret;
1554 /*
1555 * Check for SAM Task Attribute Emulation
1556 */
1557 if (transport_check_alloc_task_attr(cmd) < 0) {
1558 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1559 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1560 return -EINVAL;
c66ac9db
NB		 1561 }
1562 spin_lock(&cmd->se_lun->lun_sep_lock);
1563 if (cmd->se_lun->lun_sep)
1564 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1565 spin_unlock(&cmd->se_lun->lun_sep_lock);
1566 return 0;
1567}
1568EXPORT_SYMBOL(transport_generic_allocate_tasks);
1569
695434e1
NB		 1570/*
1571 * Used by fabric module frontends to queue tasks directly.
1572 * Many only be used from process context only
1573 */
1574int transport_handle_cdb_direct(
1575 struct se_cmd *cmd)
1576{
dd8ae59d
NB		 1577 int ret;
1578
695434e1
NB		 1579 if (!cmd->se_lun) {
1580 dump_stack();
6708bb27 1581 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1582 return -EINVAL;
1583 }
1584 if (in_interrupt()) {
1585 dump_stack();
6708bb27 1586 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1587 " from interrupt context\n");
1588 return -EINVAL;
1589 }
dd8ae59d 1590 /*
7d680f3b 1591 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
dd8ae59d
NB		 1592 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1593 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1594 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1595 *
1596 * Also, we don't take cmd->t_state_lock here as we only expect
1597 * this to be called for initial descriptor submission.
1598 */
1599 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1600 cmd->transport_state |= CMD_T_ACTIVE;
1601
dd8ae59d
NB		 1602 /*
1603 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1604 * so follow TRANSPORT_NEW_CMD processing thread context usage
1605 * and call transport_generic_request_failure() if necessary..
1606 */
1607 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1608 if (ret < 0)
1609 transport_generic_request_failure(cmd);
1610
dd8ae59d 1611 return 0;
695434e1
NB		 1612}
1613EXPORT_SYMBOL(transport_handle_cdb_direct);
1614
a6360785
NB		 1615/**
1616 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1617 *
1618 * @se_cmd: command descriptor to submit
1619 * @se_sess: associated se_sess for endpoint
1620 * @cdb: pointer to SCSI CDB
1621 * @sense: pointer to SCSI sense buffer
1622 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1623 * @data_length: fabric expected data transfer length
1624 * @task_addr: SAM task attribute
1625 * @data_dir: DMA data direction
1626 * @flags: flags for command submission from target_sc_flags_tables
1627 *
1628 * This may only be called from process context, and also currently
1629 * assumes internal allocation of fabric payload buffer by target-core.
1630 **/
1edcdb49 1631void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785
NB		 1632 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1633 u32 data_length, int task_attr, int data_dir, int flags)
1634{
1635 struct se_portal_group *se_tpg;
1636 int rc;
1637
1638 se_tpg = se_sess->se_tpg;
1639 BUG_ON(!se_tpg);
1640 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1641 BUG_ON(in_interrupt());
1642 /*
1643 * Initialize se_cmd for target operation. From this point
1644 * exceptions are handled by sending exception status via
1645 * target_core_fabric_ops->queue_status() callback
1646 */
1647 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1648 data_length, data_dir, task_attr, sense);
1649 /*
1650 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1651 * se_sess->sess_cmd_list. A second kref_get here is necessary
1652 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1653 * kref_put() to happen during fabric packet acknowledgement.
1654 */
1655 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1656 /*
1657 * Signal bidirectional data payloads to target-core
1658 */
1659 if (flags & TARGET_SCF_BIDI_OP)
1660 se_cmd->se_cmd_flags |= SCF_BIDI;
1661 /*
1662 * Locate se_lun pointer and attach it to struct se_cmd
1663 */
735703ca
NB		 1664 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1665 transport_send_check_condition_and_sense(se_cmd,
1666 se_cmd->scsi_sense_reason, 0);
1667 target_put_sess_cmd(se_sess, se_cmd);
1668 return;
1669 }
a6360785
NB		 1670 /*
1671 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1672 * allocate the necessary tasks to complete the received CDB+data
1673 */
1674 rc = transport_generic_allocate_tasks(se_cmd, cdb);
735703ca
NB		 1675 if (rc != 0) {
1676 transport_generic_request_failure(se_cmd);
1677 return;
1678 }
a6360785
NB		 1679 /*
1680 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1681 * for immediate execution of READs, otherwise wait for
1682 * transport_generic_handle_data() to be called for WRITEs
1683 * when fabric has filled the incoming buffer.
1684 */
1685 transport_handle_cdb_direct(se_cmd);
1edcdb49 1686 return;
a6360785
NB		 1687}
1688EXPORT_SYMBOL(target_submit_cmd);
1689
ea98d7f9
AG		 1690/**
1691 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1692 * for TMR CDBs
1693 *
1694 * @se_cmd: command descriptor to submit
1695 * @se_sess: associated se_sess for endpoint
1696 * @sense: pointer to SCSI sense buffer
1697 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1698 * @fabric_context: fabric context for TMR req
1699 * @tm_type: Type of TM request
1700 *
1701 * Callable from all contexts.
1702 **/
1703
1704void target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1705 unsigned char *sense, u32 unpacked_lun,
1706 void *fabric_tmr_ptr, unsigned char tm_type, int flags)
1707{
1708 struct se_portal_group *se_tpg;
1709 int ret;
1710
1711 se_tpg = se_sess->se_tpg;
1712 BUG_ON(!se_tpg);
1713
1714 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1715 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1716
1717 /* See target_submit_cmd for commentary */
1718 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1719
1720 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, GFP_KERNEL);
1721 if (ret < 0) {
1722 dump_stack();
1723 /* FIXME XXX */
1724 return;
1725 }
1726
1727 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1728 if (ret) {
1729 transport_send_check_condition_and_sense(se_cmd,
1730 se_cmd->scsi_sense_reason, 0);
1731 transport_generic_free_cmd(se_cmd, 0);
1732 return;
1733 }
1734 transport_generic_handle_tmr(se_cmd);
1735}
1736EXPORT_SYMBOL(target_submit_tmr);
1737
c66ac9db
NB		 1738/*
1739 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1740 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1741 * complete setup in TCM process context w/ TFO->new_cmd_map().
1742 */
1743int transport_generic_handle_cdb_map(
1744 struct se_cmd *cmd)
1745{
e3d6f909 1746 if (!cmd->se_lun) {
c66ac9db 1747 dump_stack();
6708bb27 1748 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1749 return -EINVAL;
c66ac9db
NB		 1750 }
1751
f7a5cc0b 1752 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1753 return 0;
1754}
1755EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1756
1757/* transport_generic_handle_data():
1758 *
1759 *
1760 */
1761int transport_generic_handle_data(
1762 struct se_cmd *cmd)
1763{
1764 /*
1765 * For the software fabric case, then we assume the nexus is being
1766 * failed/shutdown when signals are pending from the kthread context
1767 * caller, so we return a failure. For the HW target mode case running
1768 * in interrupt code, the signal_pending() check is skipped.
1769 */
1770 if (!in_interrupt() && signal_pending(current))
e3d6f909 1771 return -EPERM;
c66ac9db
NB		 1772 /*
1773 * If the received CDB has aleady been ABORTED by the generic
1774 * target engine, we now call transport_check_aborted_status()
1775 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1776 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1777 * sequences at this point.
1778 */
1779 if (transport_check_aborted_status(cmd, 1) != 0)
1780 return 0;
1781
f7a5cc0b 1782 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1783 return 0;
1784}
1785EXPORT_SYMBOL(transport_generic_handle_data);
1786
1787/* transport_generic_handle_tmr():
1788 *
1789 *
1790 */
1791int transport_generic_handle_tmr(
1792 struct se_cmd *cmd)
1793{
f7a5cc0b 1794 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1795 return 0;
1796}
1797EXPORT_SYMBOL(transport_generic_handle_tmr);
1798
cdbb70bb
CH		 1799/*
1800 * If the task is active, request it to be stopped and sleep until it
1801 * has completed.
1802 */
1803bool target_stop_task(struct se_task *task, unsigned long *flags)
1804{
1805 struct se_cmd *cmd = task->task_se_cmd;
1806 bool was_active = false;
1807
1808 if (task->task_flags & TF_ACTIVE) {
1809 task->task_flags |= TF_REQUEST_STOP;
1810 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1811
1812 pr_debug("Task %p waiting to complete\n", task);
1813 wait_for_completion(&task->task_stop_comp);
1814 pr_debug("Task %p stopped successfully\n", task);
1815
1816 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1817 atomic_dec(&cmd->t_task_cdbs_left);
1818 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1819 was_active = true;
1820 }
1821
cdbb70bb
CH		 1822 return was_active;
1823}
1824
c66ac9db
NB		 1825static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1826{
1827 struct se_task *task, *task_tmp;
1828 unsigned long flags;
1829 int ret = 0;
1830
6708bb27 1831 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1832 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1833
1834 /*
1835 * No tasks remain in the execution queue
1836 */
a1d8b49a 1837 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1838 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1839 &cmd->t_task_list, t_list) {
04629b7b 1840 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1841 /*
1842 * If the struct se_task has not been sent and is not active,
1843 * remove the struct se_task from the execution queue.
1844 */
6c76bf95 1845 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1846 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1847 flags);
1848 transport_remove_task_from_execute_queue(task,
42bf829e 1849 cmd->se_dev);
c66ac9db 1850
04629b7b 1851 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1852 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1853 continue;
1854 }
1855
cdbb70bb 1856 if (!target_stop_task(task, &flags)) {
04629b7b 1857 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1858 ret++;
1859 }
c66ac9db 1860 }
a1d8b49a 1861 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1862
1863 return ret;
1864}
1865
c66ac9db
NB		 1866/*
1867 * Handle SAM-esque emulation for generic transport request failures.
1868 */
03e98c9e 1869static void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1870{
07bde79a
NB		 1871 int ret = 0;
1872
6708bb27 1873 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1874 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1875 cmd->t_task_cdb[0]);
03e98c9e 1876 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1877 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1878 cmd->t_state, cmd->scsi_sense_reason);
6708bb27 1879 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db 1880 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
7d680f3b
CH		 1881 " CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1882 cmd->t_task_list_num,
a1d8b49a
AG		 1883 atomic_read(&cmd->t_task_cdbs_left),
1884 atomic_read(&cmd->t_task_cdbs_sent),
1885 atomic_read(&cmd->t_task_cdbs_ex_left),
7d680f3b
CH		 1886 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1887 (cmd->transport_state & CMD_T_STOP) != 0,
1888 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1889
c66ac9db
NB		 1890 /*
1891 * For SAM Task Attribute emulation for failed struct se_cmd
1892 */
1893 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1894 transport_complete_task_attr(cmd);
1895
03e98c9e
NB		 1896 switch (cmd->scsi_sense_reason) {
1897 case TCM_NON_EXISTENT_LUN:
1898 case TCM_UNSUPPORTED_SCSI_OPCODE:
1899 case TCM_INVALID_CDB_FIELD:
1900 case TCM_INVALID_PARAMETER_LIST:
1901 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1902 case TCM_UNKNOWN_MODE_PAGE:
1903 case TCM_WRITE_PROTECTED:
1904 case TCM_CHECK_CONDITION_ABORT_CMD:
1905 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1906 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1907 break;
03e98c9e 1908 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1909 /*
1910 * No SENSE Data payload for this case, set SCSI Status
1911 * and queue the response to $FABRIC_MOD.
1912 *
1913 * Uses linux/include/scsi/scsi.h SAM status codes defs
1914 */
1915 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1916 /*
1917 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1918 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1919 * CONFLICT STATUS.
1920 *
1921 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1922 */
e3d6f909
AG		 1923 if (cmd->se_sess &&
1924 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1925 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1926 cmd->orig_fe_lun, 0x2C,
1927 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1928
07bde79a 1929 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1930 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1931 goto queue_full;
c66ac9db 1932 goto check_stop;
c66ac9db 1933 default:
6708bb27 1934 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1935 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1936 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1937 break;
1938 }
16ab8e60
NB		 1939 /*
1940 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1941 * make the call to transport_send_check_condition_and_sense()
1942 * directly. Otherwise expect the fabric to make the call to
1943 * transport_send_check_condition_and_sense() after handling
1944 * possible unsoliticied write data payloads.
1945 */
03e98c9e
NB		 1946 ret = transport_send_check_condition_and_sense(cmd,
1947 cmd->scsi_sense_reason, 0);
1948 if (ret == -EAGAIN || ret == -ENOMEM)
1949 goto queue_full;
07bde79a 1950
c66ac9db
NB		 1951check_stop:
1952 transport_lun_remove_cmd(cmd);
6708bb27 1953 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1954 ;
07bde79a
NB		 1955 return;
1956
1957queue_full:
e057f533
CH		 1958 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1959 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1960}
1961
c66ac9db
NB		 1962static inline u32 transport_lba_21(unsigned char *cdb)
1963{
1964 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1965}
1966
1967static inline u32 transport_lba_32(unsigned char *cdb)
1968{
1969 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1970}
1971
1972static inline unsigned long long transport_lba_64(unsigned char *cdb)
1973{
1974 unsigned int __v1, __v2;
1975
1976 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1977 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1978
1979 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1980}
1981
1982/*
1983 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1984 */
1985static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1986{
1987 unsigned int __v1, __v2;
1988
1989 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1990 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1991
1992 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1993}
1994
1995static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1996{
1997 unsigned long flags;
1998
a1d8b49a 1999 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2000 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2001 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2002}
2003
c66ac9db
NB		 2004/*
2005 * Called from Fabric Module context from transport_execute_tasks()
2006 *
2007 * The return of this function determins if the tasks from struct se_cmd
2008 * get added to the execution queue in transport_execute_tasks(),
2009 * or are added to the delayed or ordered lists here.
2010 */
2011static inline int transport_execute_task_attr(struct se_cmd *cmd)
2012{
5951146d 2013 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2014 return 1;
2015 /*
25985edc 2016 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2017 * to allow the passed struct se_cmd list of tasks to the front of the list.
2018 */
e66ecd50 2019 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
6708bb27 2020 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2021 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2022 cmd->t_task_cdb[0],
c66ac9db
NB		 2023 cmd->se_ordered_id);
2024 return 1;
e66ecd50 2025 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d 2026 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2027 smp_mb__after_atomic_inc();
2028
6708bb27 2029 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2030 " list, se_ordered_id: %u\n",
a1d8b49a 2031 cmd->t_task_cdb[0],
c66ac9db
NB		 2032 cmd->se_ordered_id);
2033 /*
2034 * Add ORDERED command to tail of execution queue if
2035 * no other older commands exist that need to be
2036 * completed first.
2037 */
6708bb27 2038 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2039 return 1;
2040 } else {
2041 /*
2042 * For SIMPLE and UNTAGGED Task Attribute commands
2043 */
5951146d 2044 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2045 smp_mb__after_atomic_inc();
2046 }
2047 /*
2048 * Otherwise if one or more outstanding ORDERED task attribute exist,
2049 * add the dormant task(s) built for the passed struct se_cmd to the
2050 * execution queue and become in Active state for this struct se_device.
2051 */
5951146d 2052 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2053 /*
2054 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2055 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2056 */
5951146d 2057 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2058 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2059 list_add_tail(&cmd->se_delayed_node,
2060 &cmd->se_dev->delayed_cmd_list);
2061 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2062
6708bb27 2063 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2064 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2065 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2066 cmd->se_ordered_id);
2067 /*
2068 * Return zero to let transport_execute_tasks() know
2069 * not to add the delayed tasks to the execution list.
2070 */
2071 return 0;
2072 }
2073 /*
2074 * Otherwise, no ORDERED task attributes exist..
2075 */
2076 return 1;
2077}
2078
2079/*
2080 * Called from fabric module context in transport_generic_new_cmd() and
2081 * transport_generic_process_write()
2082 */
2083static int transport_execute_tasks(struct se_cmd *cmd)
2084{
2085 int add_tasks;
40be67f4 2086 struct se_device *se_dev = cmd->se_dev;
c66ac9db
NB		 2087 /*
2088 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2089 * has occurred that prevents execution.
c66ac9db 2090 */
6708bb27 2091 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2092 /*
2093 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2094 * attribute for the tasks of the received struct se_cmd CDB
2095 */
2096 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2097 if (!add_tasks)
c66ac9db
NB		 2098 goto execute_tasks;
2099 /*
4d2300cc
NB		 2100 * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2101 * adds associated se_tasks while holding dev->execute_task_lock
2102 * before I/O dispath to avoid a double spinlock access.
c66ac9db 2103 */
4d2300cc
NB		 2104 __transport_execute_tasks(se_dev, cmd);
2105 return 0;
c66ac9db 2106 }
4d2300cc 2107
c66ac9db 2108execute_tasks:
4d2300cc 2109 __transport_execute_tasks(se_dev, NULL);
c66ac9db
NB		 2110 return 0;
2111}
2112
2113/*
2114 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2115 * from struct se_device->execute_task_list and
2116 *
2117 * Called from transport_processing_thread()
2118 */
4d2300cc 2119static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
c66ac9db
NB		 2120{
2121 int error;
2122 struct se_cmd *cmd = NULL;
e3d6f909 2123 struct se_task *task = NULL;
c66ac9db
NB		 2124 unsigned long flags;
2125
c66ac9db 2126check_depth:
e3d6f909 2127 spin_lock_irq(&dev->execute_task_lock);
4d2300cc
NB		 2128 if (new_cmd != NULL)
2129 __transport_add_tasks_from_cmd(new_cmd);
2130
e3d6f909
AG		 2131 if (list_empty(&dev->execute_task_list)) {
2132 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2133 return 0;
2134 }
e3d6f909
AG		 2135 task = list_first_entry(&dev->execute_task_list,
2136 struct se_task, t_execute_list);
04629b7b 2137 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2138 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db 2139
e3d6f909 2140 cmd = task->task_se_cmd;
a1d8b49a 2141 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2142 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2143 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2144
a1d8b49a
AG		 2145 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2146 cmd->t_task_list_num)
7d680f3b 2147 cmd->transport_state |= CMD_T_SENT;
c66ac9db 2148
a1d8b49a 2149 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2150
5bda90c8
CH		 2151 if (cmd->execute_task)
2152 error = cmd->execute_task(task);
2153 else
2154 error = dev->transport->do_task(task);
d29a5b6a 2155 if (error != 0) {
d29a5b6a
CH		 2156 spin_lock_irqsave(&cmd->t_state_lock, flags);
2157 task->task_flags &= ~TF_ACTIVE;
7d680f3b 2158 cmd->transport_state &= ~CMD_T_SENT;
d29a5b6a 2159 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
7d680f3b 2160
d29a5b6a 2161 transport_stop_tasks_for_cmd(cmd);
03e98c9e 2162 transport_generic_request_failure(cmd);
c66ac9db
NB		 2163 }
2164
4d2300cc 2165 new_cmd = NULL;
c66ac9db
NB		 2166 goto check_depth;
2167
2168 return 0;
2169}
2170
c66ac9db
NB		 2171static inline u32 transport_get_sectors_6(
2172 unsigned char *cdb,
2173 struct se_cmd *cmd,
2174 int *ret)
2175{
5951146d 2176 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2177
2178 /*
2179 * Assume TYPE_DISK for non struct se_device objects.
2180 * Use 8-bit sector value.
2181 */
2182 if (!dev)
2183 goto type_disk;
2184
2185 /*
2186 * Use 24-bit allocation length for TYPE_TAPE.
2187 */
e3d6f909 2188 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2189 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2190
2191 /*
2192 * Everything else assume TYPE_DISK Sector CDB location.
9b5cd7f3
RD		 2193 * Use 8-bit sector value. SBC-3 says:
2194 *
2195 * A TRANSFER LENGTH field set to zero specifies that 256
2196 * logical blocks shall be written. Any other value
2197 * specifies the number of logical blocks that shall be
2198 * written.
c66ac9db
NB		 2199 */
2200type_disk:
9b5cd7f3 2201 return cdb[4] ? : 256;
c66ac9db
NB		 2202}
2203
2204static inline u32 transport_get_sectors_10(
2205 unsigned char *cdb,
2206 struct se_cmd *cmd,
2207 int *ret)
2208{
5951146d 2209 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2210
2211 /*
2212 * Assume TYPE_DISK for non struct se_device objects.
2213 * Use 16-bit sector value.
2214 */
2215 if (!dev)
2216 goto type_disk;
2217
2218 /*
2219 * XXX_10 is not defined in SSC, throw an exception
2220 */
e3d6f909
AG		 2221 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2222 *ret = -EINVAL;
c66ac9db
NB		 2223 return 0;
2224 }
2225
2226 /*
2227 * Everything else assume TYPE_DISK Sector CDB location.
2228 * Use 16-bit sector value.
2229 */
2230type_disk:
2231 return (u32)(cdb[7] << 8) + cdb[8];
2232}
2233
2234static inline u32 transport_get_sectors_12(
2235 unsigned char *cdb,
2236 struct se_cmd *cmd,
2237 int *ret)
2238{
5951146d 2239 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2240
2241 /*
2242 * Assume TYPE_DISK for non struct se_device objects.
2243 * Use 32-bit sector value.
2244 */
2245 if (!dev)
2246 goto type_disk;
2247
2248 /*
2249 * XXX_12 is not defined in SSC, throw an exception
2250 */
e3d6f909
AG		 2251 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2252 *ret = -EINVAL;
c66ac9db
NB		 2253 return 0;
2254 }
2255
2256 /*
2257 * Everything else assume TYPE_DISK Sector CDB location.
2258 * Use 32-bit sector value.
2259 */
2260type_disk:
2261 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2262}
2263
2264static inline u32 transport_get_sectors_16(
2265 unsigned char *cdb,
2266 struct se_cmd *cmd,
2267 int *ret)
2268{
5951146d 2269 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2270
2271 /*
2272 * Assume TYPE_DISK for non struct se_device objects.
2273 * Use 32-bit sector value.
2274 */
2275 if (!dev)
2276 goto type_disk;
2277
2278 /*
2279 * Use 24-bit allocation length for TYPE_TAPE.
2280 */
e3d6f909 2281 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2282 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2283
2284type_disk:
2285 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2286 (cdb[12] << 8) + cdb[13];
2287}
2288
2289/*
2290 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2291 */
2292static inline u32 transport_get_sectors_32(
2293 unsigned char *cdb,
2294 struct se_cmd *cmd,
2295 int *ret)
2296{
2297 /*
2298 * Assume TYPE_DISK for non struct se_device objects.
2299 * Use 32-bit sector value.
2300 */
2301 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2302 (cdb[30] << 8) + cdb[31];
2303
2304}
2305
2306static inline u32 transport_get_size(
2307 u32 sectors,
2308 unsigned char *cdb,
2309 struct se_cmd *cmd)
2310{
5951146d 2311 struct se_device *dev = cmd->se_dev;
c66ac9db 2312
e3d6f909 2313 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2314 if (cdb[1] & 1) { /* sectors */
e3d6f909 2315 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2316 } else /* bytes */
2317 return sectors;
2318 }
2319#if 0
6708bb27 2320 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2321 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2322 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2323 dev->transport->name);
c66ac9db 2324#endif
e3d6f909 2325 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2326}
2327
c66ac9db
NB		 2328static void transport_xor_callback(struct se_cmd *cmd)
2329{
2330 unsigned char *buf, *addr;
ec98f782 2331 struct scatterlist *sg;
c66ac9db
NB		 2332 unsigned int offset;
2333 int i;
ec98f782 2334 int count;
c66ac9db
NB		 2335 /*
2336 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2337 *
2338 * 1) read the specified logical block(s);
2339 * 2) transfer logical blocks from the data-out buffer;
2340 * 3) XOR the logical blocks transferred from the data-out buffer with
2341 * the logical blocks read, storing the resulting XOR data in a buffer;
2342 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2343 * blocks transferred from the data-out buffer; and
2344 * 5) transfer the resulting XOR data to the data-in buffer.
2345 */
2346 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2347 if (!buf) {
2348 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2349 return;
2350 }
2351 /*
ec98f782 2352 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2353 * into the locally allocated *buf
2354 */
ec98f782
AG		 2355 sg_copy_to_buffer(cmd->t_data_sg,
2356 cmd->t_data_nents,
2357 buf,
2358 cmd->data_length);
2359
c66ac9db
NB		 2360 /*
2361 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2362 * cmd->t_mem_bidi_list
c66ac9db
NB		 2363 */
2364
2365 offset = 0;
ec98f782
AG		 2366 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2367 addr = kmap_atomic(sg_page(sg), KM_USER0);
2368 if (!addr)
c66ac9db
NB		 2369 goto out;
2370
ec98f782
AG		 2371 for (i = 0; i < sg->length; i++)
2372 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2373
ec98f782 2374 offset += sg->length;
c66ac9db
NB		 2375 kunmap_atomic(addr, KM_USER0);
2376 }
ec98f782 2377
c66ac9db
NB		 2378out:
2379 kfree(buf);
2380}
2381
2382/*
2383 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2384 */
2385static int transport_get_sense_data(struct se_cmd *cmd)
2386{
2387 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2388 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2389 struct se_task *task = NULL, *task_tmp;
2390 unsigned long flags;
2391 u32 offset = 0;
2392
e3d6f909
AG		 2393 WARN_ON(!cmd->se_lun);
2394
42bf829e
CH		 2395 if (!dev)
2396 return 0;
2397
a1d8b49a 2398 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2399 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2400 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2401 return 0;
2402 }
2403
2404 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2405 &cmd->t_task_list, t_list) {
ef804a84 2406 if (!(task->task_flags & TF_HAS_SENSE))
c66ac9db
NB		 2407 continue;
2408
e3d6f909 2409 if (!dev->transport->get_sense_buffer) {
6708bb27 2410 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2411 " is NULL\n");
2412 continue;
2413 }
2414
e3d6f909 2415 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2416 if (!sense_buffer) {
04629b7b 2417 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2418 " sense buffer for task with sense\n",
04629b7b 2419 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2420 continue;
2421 }
a1d8b49a 2422 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2423
e3d6f909 2424 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2425 TRANSPORT_SENSE_BUFFER);
2426
5951146d 2427 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2428 TRANSPORT_SENSE_BUFFER);
2429 cmd->scsi_status = task->task_scsi_status;
2430 /* Automatically padded */
2431 cmd->scsi_sense_length =
2432 (TRANSPORT_SENSE_BUFFER + offset);
2433
6708bb27 2434 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2435 " and sense\n",
e3d6f909 2436 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2437 cmd->scsi_status);
2438 return 0;
2439 }
a1d8b49a 2440 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2441
2442 return -1;
2443}
2444
ec98f782
AG		 2445static inline long long transport_dev_end_lba(struct se_device *dev)
2446{
2447 return dev->transport->get_blocks(dev) + 1;
2448}
2449
2450static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2451{
2452 struct se_device *dev = cmd->se_dev;
2453 u32 sectors;
2454
2455 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2456 return 0;
2457
2458 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2459
6708bb27
AG		 2460 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2461 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2462 " transport_dev_end_lba(): %llu\n",
2463 cmd->t_task_lba, sectors,
2464 transport_dev_end_lba(dev));
7abbe7f3 2465 return -EINVAL;
ec98f782
AG		 2466 }
2467
7abbe7f3 2468 return 0;
ec98f782
AG		 2469}
2470
706d5860
NB		 2471static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2472{
2473 /*
2474 * Determine if the received WRITE_SAME is used to for direct
2475 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2476 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2477 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2478 */
2479 int passthrough = (dev->transport->transport_type ==
2480 TRANSPORT_PLUGIN_PHBA_PDEV);
2481
2482 if (!passthrough) {
2483 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2484 pr_err("WRITE_SAME PBDATA and LBDATA"
2485 " bits not supported for Block Discard"
2486 " Emulation\n");
2487 return -ENOSYS;
2488 }
2489 /*
2490 * Currently for the emulated case we only accept
2491 * tpws with the UNMAP=1 bit set.
2492 */
2493 if (!(flags[0] & 0x08)) {
2494 pr_err("WRITE_SAME w/o UNMAP bit not"
2495 " supported for Block Discard Emulation\n");
2496 return -ENOSYS;
2497 }
2498 }
2499
2500 return 0;
2501}
2502
c66ac9db
NB		 2503/* transport_generic_cmd_sequencer():
2504 *
2505 * Generic Command Sequencer that should work for most DAS transport
2506 * drivers.
2507 *
2508 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2509 * RX Thread.
2510 *
2511 * FIXME: Need to support other SCSI OPCODES where as well.
2512 */
2513static int transport_generic_cmd_sequencer(
2514 struct se_cmd *cmd,
2515 unsigned char *cdb)
2516{
5951146d 2517 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2518 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2519 int ret = 0, sector_ret = 0, passthrough;
2520 u32 sectors = 0, size = 0, pr_reg_type = 0;
2521 u16 service_action;
2522 u8 alua_ascq = 0;
2523 /*
2524 * Check for an existing UNIT ATTENTION condition
2525 */
2526 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2527 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2528 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2529 return -EINVAL;
c66ac9db
NB		 2530 }
2531 /*
2532 * Check status of Asymmetric Logical Unit Assignment port
2533 */
e3d6f909 2534 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2535 if (ret != 0) {
c66ac9db 2536 /*
25985edc 2537 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2538 * The ALUA additional sense code qualifier (ASCQ) is determined
2539 * by the ALUA primary or secondary access state..
2540 */
2541 if (ret > 0) {
2542#if 0
6708bb27 2543 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2544 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2545 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2546#endif
2547 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2548 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2549 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2550 return -EINVAL;
c66ac9db
NB		 2551 }
2552 goto out_invalid_cdb_field;
2553 }
2554 /*
2555 * Check status for SPC-3 Persistent Reservations
2556 */
e3d6f909
AG		 2557 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2558 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2559 cmd, cdb, pr_reg_type) != 0) {
2560 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2561 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2562 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2563 return -EBUSY;
2564 }
c66ac9db
NB		 2565 /*
2566 * This means the CDB is allowed for the SCSI Initiator port
2567 * when said port is *NOT* holding the legacy SPC-2 or
2568 * SPC-3 Persistent Reservation.
2569 */
2570 }
2571
5bda90c8
CH		 2572 /*
2573 * If we operate in passthrough mode we skip most CDB emulation and
2574 * instead hand the commands down to the physical SCSI device.
2575 */
2576 passthrough =
2577 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2578
c66ac9db
NB		 2579 switch (cdb[0]) {
2580 case READ_6:
2581 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2582 if (sector_ret)
2583 goto out_unsupported_cdb;
2584 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2585 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2586 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2587 break;
2588 case READ_10:
2589 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2590 if (sector_ret)
2591 goto out_unsupported_cdb;
2592 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2593 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2594 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2595 break;
2596 case READ_12:
2597 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2598 if (sector_ret)
2599 goto out_unsupported_cdb;
2600 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2601 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2602 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2603 break;
2604 case READ_16:
2605 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2606 if (sector_ret)
2607 goto out_unsupported_cdb;
2608 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2609 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2610 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2611 break;
2612 case WRITE_6:
2613 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2614 if (sector_ret)
2615 goto out_unsupported_cdb;
2616 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2617 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2618 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2619 break;
2620 case WRITE_10:
2621 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2622 if (sector_ret)
2623 goto out_unsupported_cdb;
2624 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2625 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2626 if (cdb[1] & 0x8)
2627 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2628 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2629 break;
2630 case WRITE_12:
2631 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2632 if (sector_ret)
2633 goto out_unsupported_cdb;
2634 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2635 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2636 if (cdb[1] & 0x8)
2637 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2638 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2639 break;
2640 case WRITE_16:
2641 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2642 if (sector_ret)
2643 goto out_unsupported_cdb;
2644 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2645 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2646 if (cdb[1] & 0x8)
2647 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2648 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2649 break;
2650 case XDWRITEREAD_10:
2651 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2652 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2653 goto out_invalid_cdb_field;
2654 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2655 if (sector_ret)
2656 goto out_unsupported_cdb;
2657 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2658 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2659 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2660
5bda90c8
CH		 2661 /*
2662 * Do now allow BIDI commands for passthrough mode.
2663 */
2664 if (passthrough)
7c1c6af3 2665 goto out_unsupported_cdb;
5bda90c8 2666
c66ac9db 2667 /*
35e0e757 2668 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2669 */
2670 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2671 if (cdb[1] & 0x8)
2672 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2673 break;
2674 case VARIABLE_LENGTH_CMD:
2675 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2676 switch (service_action) {
2677 case XDWRITEREAD_32:
2678 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2679 if (sector_ret)
2680 goto out_unsupported_cdb;
2681 size = transport_get_size(sectors, cdb, cmd);
2682 /*
2683 * Use WRITE_32 and READ_32 opcodes for the emulated
2684 * XDWRITE_READ_32 logic.
2685 */
a1d8b49a 2686 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2687 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2688
5bda90c8
CH		 2689 /*
2690 * Do now allow BIDI commands for passthrough mode.
2691 */
c66ac9db 2692 if (passthrough)
7c1c6af3 2693 goto out_unsupported_cdb;
5bda90c8 2694
c66ac9db 2695 /*
35e0e757
CH		 2696 * Setup BIDI XOR callback to be run during after I/O
2697 * completion.
c66ac9db
NB		 2698 */
2699 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2700 if (cdb[1] & 0x8)
2701 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2702 break;
2703 case WRITE_SAME_32:
2704 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2705 if (sector_ret)
2706 goto out_unsupported_cdb;
dd3a5ad8 2707
6708bb27 2708 if (sectors)
12850626 2709 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2710 else {
2711 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2712 " supported\n");
2713 goto out_invalid_cdb_field;
2714 }
dd3a5ad8 2715
a1d8b49a 2716 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2717 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2718
706d5860 2719 if (target_check_write_same_discard(&cdb[10], dev) < 0)
67236c44 2720 goto out_unsupported_cdb;
5bda90c8
CH		 2721 if (!passthrough)
2722 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2723 break;
2724 default:
6708bb27 2725 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2726 " 0x%04x not supported\n", service_action);
2727 goto out_unsupported_cdb;
2728 }
2729 break;
e434f1f1 2730 case MAINTENANCE_IN:
e3d6f909 2731 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2732 /* MAINTENANCE_IN from SCC-2 */
2733 /*
2734 * Check for emulated MI_REPORT_TARGET_PGS.
2735 */
e76a35d6
CH		 2736 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2737 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2738 cmd->execute_task =
2739 target_emulate_report_target_port_groups;
c66ac9db
NB		 2740 }
2741 size = (cdb[6] << 24) | (cdb[7] << 16) |
2742 (cdb[8] << 8) | cdb[9];
2743 } else {
2744 /* GPCMD_SEND_KEY from multi media commands */
2745 size = (cdb[8] << 8) + cdb[9];
2746 }
05d1c7c0 2747 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2748 break;
2749 case MODE_SELECT:
2750 size = cdb[4];
2751 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2752 break;
2753 case MODE_SELECT_10:
2754 size = (cdb[7] << 8) + cdb[8];
2755 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2756 break;
2757 case MODE_SENSE:
2758 size = cdb[4];
05d1c7c0 2759 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2760 if (!passthrough)
2761 cmd->execute_task = target_emulate_modesense;
c66ac9db
NB		 2762 break;
2763 case MODE_SENSE_10:
5bda90c8
CH		 2764 size = (cdb[7] << 8) + cdb[8];
2765 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2766 if (!passthrough)
2767 cmd->execute_task = target_emulate_modesense;
2768 break;
c66ac9db
NB		 2769 case GPCMD_READ_BUFFER_CAPACITY:
2770 case GPCMD_SEND_OPC:
2771 case LOG_SELECT:
2772 case LOG_SENSE:
2773 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2774 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2775 break;
2776 case READ_BLOCK_LIMITS:
2777 size = READ_BLOCK_LEN;
05d1c7c0 2778 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2779 break;
2780 case GPCMD_GET_CONFIGURATION:
2781 case GPCMD_READ_FORMAT_CAPACITIES:
2782 case GPCMD_READ_DISC_INFO:
2783 case GPCMD_READ_TRACK_RZONE_INFO:
2784 size = (cdb[7] << 8) + cdb[8];
2785 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2786 break;
2787 case PERSISTENT_RESERVE_IN:
617c0e06 2788 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2789 cmd->execute_task = target_scsi3_emulate_pr_in;
617c0e06
CH		 2790 size = (cdb[7] << 8) + cdb[8];
2791 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2792 break;
c66ac9db 2793 case PERSISTENT_RESERVE_OUT:
617c0e06 2794 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2795 cmd->execute_task = target_scsi3_emulate_pr_out;
c66ac9db 2796 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2797 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2798 break;
2799 case GPCMD_MECHANISM_STATUS:
2800 case GPCMD_READ_DVD_STRUCTURE:
2801 size = (cdb[8] << 8) + cdb[9];
2802 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2803 break;
2804 case READ_POSITION:
2805 size = READ_POSITION_LEN;
05d1c7c0 2806 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2807 break;
e434f1f1 2808 case MAINTENANCE_OUT:
e3d6f909 2809 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2810 /* MAINTENANCE_OUT from SCC-2
2811 *
2812 * Check for emulated MO_SET_TARGET_PGS.
2813 */
e76a35d6
CH		 2814 if (cdb[1] == MO_SET_TARGET_PGS &&
2815 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2816 cmd->execute_task =
2817 target_emulate_set_target_port_groups;
c66ac9db
NB		 2818 }
2819
2820 size = (cdb[6] << 24) | (cdb[7] << 16) |
2821 (cdb[8] << 8) | cdb[9];
2822 } else {
2823 /* GPCMD_REPORT_KEY from multi media commands */
2824 size = (cdb[8] << 8) + cdb[9];
2825 }
05d1c7c0 2826 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2827 break;
2828 case INQUIRY:
2829 size = (cdb[3] << 8) + cdb[4];
2830 /*
2831 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2832 * See spc4r17 section 5.3
2833 */
5951146d 2834 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2835 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2836 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2837 if (!passthrough)
2838 cmd->execute_task = target_emulate_inquiry;
c66ac9db
NB		 2839 break;
2840 case READ_BUFFER:
2841 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2842 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2843 break;
2844 case READ_CAPACITY:
2845 size = READ_CAP_LEN;
05d1c7c0 2846 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2847 if (!passthrough)
2848 cmd->execute_task = target_emulate_readcapacity;
c66ac9db
NB		 2849 break;
2850 case READ_MEDIA_SERIAL_NUMBER:
2851 case SECURITY_PROTOCOL_IN:
2852 case SECURITY_PROTOCOL_OUT:
2853 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2854 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2855 break;
2856 case SERVICE_ACTION_IN:
5bda90c8
CH		 2857 switch (cmd->t_task_cdb[1] & 0x1f) {
2858 case SAI_READ_CAPACITY_16:
2859 if (!passthrough)
2860 cmd->execute_task =
2861 target_emulate_readcapacity_16;
2862 break;
2863 default:
2864 if (passthrough)
2865 break;
2866
2867 pr_err("Unsupported SA: 0x%02x\n",
2868 cmd->t_task_cdb[1] & 0x1f);
2869 goto out_unsupported_cdb;
2870 }
2871 /*FALLTHROUGH*/
c66ac9db
NB		 2872 case ACCESS_CONTROL_IN:
2873 case ACCESS_CONTROL_OUT:
2874 case EXTENDED_COPY:
2875 case READ_ATTRIBUTE:
2876 case RECEIVE_COPY_RESULTS:
2877 case WRITE_ATTRIBUTE:
2878 size = (cdb[10] << 24) | (cdb[11] << 16) |
2879 (cdb[12] << 8) | cdb[13];
05d1c7c0 2880 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2881 break;
2882 case RECEIVE_DIAGNOSTIC:
2883 case SEND_DIAGNOSTIC:
2884 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2885 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2886 break;
2887/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2888#if 0
2889 case GPCMD_READ_CD:
2890 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2891 size = (2336 * sectors);
05d1c7c0 2892 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2893 break;
2894#endif
2895 case READ_TOC:
2896 size = cdb[8];
05d1c7c0 2897 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2898 break;
2899 case REQUEST_SENSE:
2900 size = cdb[4];
05d1c7c0 2901 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2902 if (!passthrough)
2903 cmd->execute_task = target_emulate_request_sense;
c66ac9db
NB		 2904 break;
2905 case READ_ELEMENT_STATUS:
2906 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2907 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2908 break;
2909 case WRITE_BUFFER:
2910 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2911 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2912 break;
2913 case RESERVE:
2914 case RESERVE_10:
2915 /*
2916 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2917 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2918 */
2919 if (cdb[0] == RESERVE_10)
2920 size = (cdb[7] << 8) | cdb[8];
2921 else
2922 size = cmd->data_length;
2923
2924 /*
2925 * Setup the legacy emulated handler for SPC-2 and
2926 * >= SPC-3 compatible reservation handling (CRH=1)
2927 * Otherwise, we assume the underlying SCSI logic is
2928 * is running in SPC_PASSTHROUGH, and wants reservations
2929 * emulation disabled.
2930 */
e76a35d6
CH		 2931 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2932 cmd->execute_task = target_scsi2_reservation_reserve;
c66ac9db
NB		 2933 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2934 break;
2935 case RELEASE:
2936 case RELEASE_10:
2937 /*
2938 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2939 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2940 */
2941 if (cdb[0] == RELEASE_10)
2942 size = (cdb[7] << 8) | cdb[8];
2943 else
2944 size = cmd->data_length;
2945
e76a35d6
CH		 2946 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2947 cmd->execute_task = target_scsi2_reservation_release;
c66ac9db
NB		 2948 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2949 break;
2950 case SYNCHRONIZE_CACHE:
8e94b8db 2951 case SYNCHRONIZE_CACHE_16:
c66ac9db
NB		 2952 /*
2953 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2954 */
2955 if (cdb[0] == SYNCHRONIZE_CACHE) {
2956 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2957 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2958 } else {
2959 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2960 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2961 }
2962 if (sector_ret)
2963 goto out_unsupported_cdb;
2964
2965 size = transport_get_size(sectors, cdb, cmd);
2966 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2967
5bda90c8 2968 if (passthrough)
c66ac9db 2969 break;
5bda90c8 2970
c66ac9db
NB		 2971 /*
2972 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 2973 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 2974 */
7abbe7f3
NB		 2975 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2976 if (transport_cmd_get_valid_sectors(cmd) < 0)
2977 goto out_invalid_cdb_field;
2978 }
5bda90c8 2979 cmd->execute_task = target_emulate_synchronize_cache;
c66ac9db
NB		 2980 break;
2981 case UNMAP:
2982 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 2983 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2984 if (!passthrough)
2985 cmd->execute_task = target_emulate_unmap;
c66ac9db
NB		 2986 break;
2987 case WRITE_SAME_16:
2988 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2989 if (sector_ret)
2990 goto out_unsupported_cdb;
dd3a5ad8 2991
6708bb27 2992 if (sectors)
12850626 2993 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2994 else {
2995 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2996 goto out_invalid_cdb_field;
2997 }
dd3a5ad8 2998
5db0753b 2999 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3000 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3001
3002 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 3003 goto out_unsupported_cdb;
5bda90c8
CH		 3004 if (!passthrough)
3005 cmd->execute_task = target_emulate_write_same;
706d5860
NB		 3006 break;
3007 case WRITE_SAME:
3008 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3009 if (sector_ret)
3010 goto out_unsupported_cdb;
3011
3012 if (sectors)
12850626 3013 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3014 else {
3015 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3016 goto out_invalid_cdb_field;
c66ac9db 3017 }
706d5860
NB		 3018
3019 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3020 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3021 /*
3022 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3023 * of byte 1 bit 3 UNMAP instead of original reserved field
3024 */
3025 if (target_check_write_same_discard(&cdb[1], dev) < 0)
67236c44 3026 goto out_unsupported_cdb;
5bda90c8
CH		 3027 if (!passthrough)
3028 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 3029 break;
3030 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 3031 case ERASE:
c66ac9db
NB		 3032 case REZERO_UNIT:
3033 case SEEK_10:
c66ac9db
NB		 3034 case SPACE:
3035 case START_STOP:
3036 case TEST_UNIT_READY:
3037 case VERIFY:
3038 case WRITE_FILEMARKS:
5bda90c8
CH		 3039 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3040 if (!passthrough)
3041 cmd->execute_task = target_emulate_noop;
3042 break;
3043 case GPCMD_CLOSE_TRACK:
3044 case INITIALIZE_ELEMENT_STATUS:
3045 case GPCMD_LOAD_UNLOAD:
3046 case GPCMD_SET_SPEED:
c66ac9db
NB		 3047 case MOVE_MEDIUM:
3048 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3049 break;
3050 case REPORT_LUNS:
e76a35d6 3051 cmd->execute_task = target_report_luns;
c66ac9db
NB		 3052 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3053 /*
3054 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3055 * See spc4r17 section 5.3
3056 */
5951146d 3057 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3058 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3059 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3060 break;
3061 default:
6708bb27 3062 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3063 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3064 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3065 goto out_unsupported_cdb;
3066 }
3067
3068 if (size != cmd->data_length) {
6708bb27 3069 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3070 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3071 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3072 cmd->data_length, size, cdb[0]);
3073
3074 cmd->cmd_spdtl = size;
3075
3076 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3077 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3078 " WRITE data\n");
3079 goto out_invalid_cdb_field;
3080 }
3081 /*
3082 * Reject READ_* or WRITE_* with overflow/underflow for
3083 * type SCF_SCSI_DATA_SG_IO_CDB.
3084 */
6708bb27
AG		 3085 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3086 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3087 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3088 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3089 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3090 goto out_invalid_cdb_field;
3091 }
3092
3093 if (size > cmd->data_length) {
3094 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3095 cmd->residual_count = (size - cmd->data_length);
3096 } else {
3097 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3098 cmd->residual_count = (cmd->data_length - size);
3099 }
3100 cmd->data_length = size;
3101 }
3102
5bda90c8
CH		 3103 /* reject any command that we don't have a handler for */
3104 if (!(passthrough || cmd->execute_task ||
3105 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3106 goto out_unsupported_cdb;
3107
c66ac9db
NB		 3108 transport_set_supported_SAM_opcode(cmd);
3109 return ret;
3110
3111out_unsupported_cdb:
3112 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3113 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3114 return -EINVAL;
c66ac9db
NB		 3115out_invalid_cdb_field:
3116 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3117 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3118 return -EINVAL;
c66ac9db
NB		 3119}
3120
c66ac9db 3121/*
35e0e757 3122 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3123 * and ordered cmds need to have their tasks added to the execution queue.
3124 */
3125static void transport_complete_task_attr(struct se_cmd *cmd)
3126{
5951146d 3127 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3128 struct se_cmd *cmd_p, *cmd_tmp;
3129 int new_active_tasks = 0;
3130
e66ecd50 3131 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3132 atomic_dec(&dev->simple_cmds);
3133 smp_mb__after_atomic_dec();
3134 dev->dev_cur_ordered_id++;
6708bb27 3135 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3136 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3137 cmd->se_ordered_id);
e66ecd50 3138 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 3139 dev->dev_cur_ordered_id++;
6708bb27 3140 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3141 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3142 cmd->se_ordered_id);
e66ecd50 3143 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3144 atomic_dec(&dev->dev_ordered_sync);
3145 smp_mb__after_atomic_dec();
c66ac9db
NB		 3146
3147 dev->dev_cur_ordered_id++;
6708bb27 3148 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3149 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3150 }
3151 /*
3152 * Process all commands up to the last received
3153 * ORDERED task attribute which requires another blocking
3154 * boundary
3155 */
3156 spin_lock(&dev->delayed_cmd_lock);
3157 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3158 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3159
5951146d 3160 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3161 spin_unlock(&dev->delayed_cmd_lock);
3162
6708bb27 3163 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3164 " cmd_p: 0x%02x Task Attr: 0x%02x"
3165 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3166 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3167 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3168
3169 transport_add_tasks_from_cmd(cmd_p);
3170 new_active_tasks++;
3171
3172 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3173 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3174 break;
3175 }
3176 spin_unlock(&dev->delayed_cmd_lock);
3177 /*
3178 * If new tasks have become active, wake up the transport thread
3179 * to do the processing of the Active tasks.
3180 */
3181 if (new_active_tasks != 0)
e3d6f909 3182 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3183}
3184
e057f533 3185static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3186{
3187 int ret = 0;
3188
e057f533
CH		 3189 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3190 transport_complete_task_attr(cmd);
3191
3192 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3193 ret = cmd->se_tfo->queue_status(cmd);
3194 if (ret)
3195 goto out;
3196 }
07bde79a
NB		 3197
3198 switch (cmd->data_direction) {
3199 case DMA_FROM_DEVICE:
3200 ret = cmd->se_tfo->queue_data_in(cmd);
3201 break;
3202 case DMA_TO_DEVICE:
ec98f782 3203 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3204 ret = cmd->se_tfo->queue_data_in(cmd);
3205 if (ret < 0)
e057f533 3206 break;
07bde79a
NB		 3207 }
3208 /* Fall through for DMA_TO_DEVICE */
3209 case DMA_NONE:
3210 ret = cmd->se_tfo->queue_status(cmd);
3211 break;
3212 default:
3213 break;
3214 }
3215
e057f533
CH		 3216out:
3217 if (ret < 0) {
3218 transport_handle_queue_full(cmd, cmd->se_dev);
3219 return;
3220 }
3221 transport_lun_remove_cmd(cmd);
3222 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3223}
3224
3225static void transport_handle_queue_full(
3226 struct se_cmd *cmd,
e057f533 3227 struct se_device *dev)
07bde79a
NB		 3228{
3229 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3230 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3231 atomic_inc(&dev->dev_qf_count);
3232 smp_mb__after_atomic_inc();
3233 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3234
3235 schedule_work(&cmd->se_dev->qf_work_queue);
3236}
3237
35e0e757 3238static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3239{
35e0e757 3240 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3241 int reason = 0, ret;
35e0e757 3242
c66ac9db
NB		 3243 /*
3244 * Check if we need to move delayed/dormant tasks from cmds on the
3245 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3246 * Attribute.
3247 */
5951146d 3248 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3249 transport_complete_task_attr(cmd);
07bde79a
NB		 3250 /*
3251 * Check to schedule QUEUE_FULL work, or execute an existing
3252 * cmd->transport_qf_callback()
3253 */
3254 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3255 schedule_work(&cmd->se_dev->qf_work_queue);
3256
c66ac9db
NB		 3257 /*
3258 * Check if we need to retrieve a sense buffer from
3259 * the struct se_cmd in question.
3260 */
3261 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3262 if (transport_get_sense_data(cmd) < 0)
3263 reason = TCM_NON_EXISTENT_LUN;
3264
3265 /*
3266 * Only set when an struct se_task->task_scsi_status returned
3267 * a non GOOD status.
3268 */
3269 if (cmd->scsi_status) {
07bde79a 3270 ret = transport_send_check_condition_and_sense(
c66ac9db 3271 cmd, reason, 1);
f147abb4 3272 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3273 goto queue_full;
3274
c66ac9db
NB		 3275 transport_lun_remove_cmd(cmd);
3276 transport_cmd_check_stop_to_fabric(cmd);
3277 return;
3278 }
3279 }
3280 /*
25985edc 3281 * Check for a callback, used by amongst other things
c66ac9db
NB		 3282 * XDWRITE_READ_10 emulation.
3283 */
3284 if (cmd->transport_complete_callback)
3285 cmd->transport_complete_callback(cmd);
3286
3287 switch (cmd->data_direction) {
3288 case DMA_FROM_DEVICE:
3289 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3290 if (cmd->se_lun->lun_sep) {
3291 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3292 cmd->data_length;
3293 }
3294 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3295
07bde79a 3296 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3297 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3298 goto queue_full;
c66ac9db
NB		 3299 break;
3300 case DMA_TO_DEVICE:
3301 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3302 if (cmd->se_lun->lun_sep) {
3303 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3304 cmd->data_length;
3305 }
3306 spin_unlock(&cmd->se_lun->lun_sep_lock);
3307 /*
3308 * Check if we need to send READ payload for BIDI-COMMAND
3309 */
ec98f782 3310 if (cmd->t_bidi_data_sg) {
c66ac9db 3311 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3312 if (cmd->se_lun->lun_sep) {
3313 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3314 cmd->data_length;
3315 }
3316 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3317 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3318 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3319 goto queue_full;
c66ac9db
NB		 3320 break;
3321 }
3322 /* Fall through for DMA_TO_DEVICE */
3323 case DMA_NONE:
07bde79a 3324 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3325 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3326 goto queue_full;
c66ac9db
NB		 3327 break;
3328 default:
3329 break;
3330 }
3331
3332 transport_lun_remove_cmd(cmd);
3333 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3334 return;
3335
3336queue_full:
6708bb27 3337 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3338 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3339 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3340 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3341}
3342
3343static void transport_free_dev_tasks(struct se_cmd *cmd)
3344{
3345 struct se_task *task, *task_tmp;
3346 unsigned long flags;
0c2cfe5f 3347 LIST_HEAD(dispose_list);
c66ac9db 3348
a1d8b49a 3349 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3350 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3351 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3352 if (!(task->task_flags & TF_ACTIVE))
3353 list_move_tail(&task->t_list, &dispose_list);
3354 }
3355 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3356
3357 while (!list_empty(&dispose_list)) {
3358 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3359
af3f00c7
CH		 3360 if (task->task_sg != cmd->t_data_sg &&
3361 task->task_sg != cmd->t_bidi_data_sg)
3362 kfree(task->task_sg);
c66ac9db
NB		 3363
3364 list_del(&task->t_list);
3365
42bf829e 3366 cmd->se_dev->transport->free_task(task);
c66ac9db 3367 }
c66ac9db
NB		 3368}
3369
6708bb27 3370static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3371{
ec98f782 3372 struct scatterlist *sg;
ec98f782 3373 int count;
c66ac9db 3374
6708bb27
AG		 3375 for_each_sg(sgl, sg, nents, count)
3376 __free_page(sg_page(sg));
c66ac9db 3377
6708bb27
AG		 3378 kfree(sgl);
3379}
c66ac9db 3380
6708bb27
AG		 3381static inline void transport_free_pages(struct se_cmd *cmd)
3382{
3383 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3384 return;
3385
3386 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3387 cmd->t_data_sg = NULL;
3388 cmd->t_data_nents = 0;
c66ac9db 3389
6708bb27 3390 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3391 cmd->t_bidi_data_sg = NULL;
3392 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3393}
3394
e26d99ae
CH		 3395/**
3396 * transport_release_cmd - free a command
3397 * @cmd: command to free
3398 *
3399 * This routine unconditionally frees a command, and reference counting
3400 * or list removal must be done in the caller.
3401 */
3402static void transport_release_cmd(struct se_cmd *cmd)
3403{
3404 BUG_ON(!cmd->se_tfo);
3405
c8e31f26 3406 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 3407 core_tmr_release_req(cmd->se_tmr_req);
3408 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3409 kfree(cmd->t_task_cdb);
3410 /*
7481deb4
NB		 3411 * If this cmd has been setup with target_get_sess_cmd(), drop
3412 * the kref and call ->release_cmd() in kref callback.
e26d99ae 3413 */
7481deb4
NB		 3414 if (cmd->check_release != 0) {
3415 target_put_sess_cmd(cmd->se_sess, cmd);
3416 return;
3417 }
e26d99ae
CH		 3418 cmd->se_tfo->release_cmd(cmd);
3419}
3420
d3df7825
CH		 3421/**
3422 * transport_put_cmd - release a reference to a command
3423 * @cmd: command to release
3424 *
3425 * This routine releases our reference to the command and frees it if possible.
3426 */
39c05f32 3427static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3428{
3429 unsigned long flags;
4911e3cc 3430 int free_tasks = 0;
c66ac9db 3431
a1d8b49a 3432 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3433 if (atomic_read(&cmd->t_fe_count)) {
3434 if (!atomic_dec_and_test(&cmd->t_fe_count))
3435 goto out_busy;
3436 }
3437
3438 if (atomic_read(&cmd->t_se_count)) {
3439 if (!atomic_dec_and_test(&cmd->t_se_count))
3440 goto out_busy;
3441 }
3442
7d680f3b
CH		 3443 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3444 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
4911e3cc
CH		 3445 transport_all_task_dev_remove_state(cmd);
3446 free_tasks = 1;
c66ac9db 3447 }
a1d8b49a 3448 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3449
4911e3cc
CH		 3450 if (free_tasks != 0)
3451 transport_free_dev_tasks(cmd);
d3df7825 3452
c66ac9db 3453 transport_free_pages(cmd);
31afc39c 3454 transport_release_cmd(cmd);
39c05f32 3455 return;
4911e3cc
CH		 3456out_busy:
3457 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3458}
3459
c66ac9db 3460/*
ec98f782
AG		 3461 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3462 * allocating in the core.
c66ac9db
NB		 3463 * @cmd: Associated se_cmd descriptor
3464 * @mem: SGL style memory for TCM WRITE / READ
3465 * @sg_mem_num: Number of SGL elements
3466 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3467 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3468 *
3469 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3470 * of parameters.
3471 */
3472int transport_generic_map_mem_to_cmd(
3473 struct se_cmd *cmd,
5951146d
AG		 3474 struct scatterlist *sgl,
3475 u32 sgl_count,
3476 struct scatterlist *sgl_bidi,
3477 u32 sgl_bidi_count)
c66ac9db 3478{
5951146d 3479 if (!sgl || !sgl_count)
c66ac9db 3480 return 0;
c66ac9db 3481
c66ac9db
NB		 3482 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3483 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
fef58a60
NB		 3484 /*
3485 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3486 * scatterlists already have been set to follow what the fabric
3487 * passes for the original expected data transfer length.
3488 */
3489 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3490 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3491 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3492 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3493 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3494 return -EINVAL;
3495 }
c66ac9db 3496
ec98f782
AG		 3497 cmd->t_data_sg = sgl;
3498 cmd->t_data_nents = sgl_count;
c66ac9db 3499
ec98f782
AG		 3500 if (sgl_bidi && sgl_bidi_count) {
3501 cmd->t_bidi_data_sg = sgl_bidi;
3502 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3503 }
3504 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3505 }
3506
3507 return 0;
3508}
3509EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3510
4949314c 3511void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3512{
ec98f782 3513 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 3514 struct page **pages;
3515 int i;
05d1c7c0 3516
ec98f782 3517 BUG_ON(!sg);
05d1c7c0 3518 /*
ec98f782
AG		 3519 * We need to take into account a possible offset here for fabrics like
3520 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3521 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3522 */
4949314c
AG		 3523 if (!cmd->t_data_nents)
3524 return NULL;
3525 else if (cmd->t_data_nents == 1)
3526 return kmap(sg_page(sg)) + sg->offset;
3527
3528 /* >1 page. use vmap */
3529 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3530 if (!pages)
3531 return NULL;
3532
3533 /* convert sg[] to pages[] */
3534 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3535 pages[i] = sg_page(sg);
3536 }
3537
3538 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
3539 kfree(pages);
3540 if (!cmd->t_data_vmap)
3541 return NULL;
3542
3543 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 3544}
4949314c 3545EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 3546
4949314c 3547void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 3548{
4949314c
AG		 3549 if (!cmd->t_data_nents)
3550 return;
3551 else if (cmd->t_data_nents == 1)
3552 kunmap(sg_page(cmd->t_data_sg));
3553
3554 vunmap(cmd->t_data_vmap);
3555 cmd->t_data_vmap = NULL;
05d1c7c0 3556}
4949314c 3557EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 3558
c66ac9db 3559static int
05d1c7c0 3560transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3561{
ec98f782
AG		 3562 u32 length = cmd->data_length;
3563 unsigned int nents;
3564 struct page *page;
9db9da33 3565 gfp_t zero_flag;
ec98f782 3566 int i = 0;
c66ac9db 3567
ec98f782
AG		 3568 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3569 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3570 if (!cmd->t_data_sg)
3571 return -ENOMEM;
c66ac9db 3572
ec98f782
AG		 3573 cmd->t_data_nents = nents;
3574 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3575
9db9da33 3576 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3577
ec98f782
AG		 3578 while (length) {
3579 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 3580 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 3581 if (!page)
3582 goto out;
c66ac9db 3583
ec98f782
AG		 3584 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3585 length -= page_len;
3586 i++;
c66ac9db 3587 }
c66ac9db 3588 return 0;
c66ac9db 3589
ec98f782
AG		 3590out:
3591 while (i >= 0) {
3592 __free_page(sg_page(&cmd->t_data_sg[i]));
3593 i--;
c66ac9db 3594 }
ec98f782
AG		 3595 kfree(cmd->t_data_sg);
3596 cmd->t_data_sg = NULL;
3597 return -ENOMEM;
c66ac9db
NB		 3598}
3599
a1d8b49a
AG		 3600/* Reduce sectors if they are too long for the device */
3601static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3602 struct se_device *dev,
3603 unsigned long long lba,
a1d8b49a 3604 sector_t sectors)
c66ac9db 3605{
a1d8b49a 3606 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3607
a1d8b49a
AG		 3608 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3609 if ((lba + sectors) > transport_dev_end_lba(dev))
3610 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3611
a1d8b49a 3612 return sectors;
c66ac9db
NB		 3613}
3614
c66ac9db
NB		 3615
3616/*
3617 * This function can be used by HW target mode drivers to create a linked
3618 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3619 * This is intended to be called during the completion path by TCM Core
3620 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3621 */
3622void transport_do_task_sg_chain(struct se_cmd *cmd)
3623{
ec98f782
AG		 3624 struct scatterlist *sg_first = NULL;
3625 struct scatterlist *sg_prev = NULL;
3626 int sg_prev_nents = 0;
3627 struct scatterlist *sg;
c66ac9db 3628 struct se_task *task;
ec98f782 3629 u32 chained_nents = 0;
c66ac9db
NB		 3630 int i;
3631
ec98f782
AG		 3632 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3633
c66ac9db
NB		 3634 /*
3635 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3636 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3637 */
a1d8b49a 3638 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3639 if (!task->task_sg)
c66ac9db
NB		 3640 continue;
3641
ec98f782
AG		 3642 if (!sg_first) {
3643 sg_first = task->task_sg;
6708bb27 3644 chained_nents = task->task_sg_nents;
97868c89 3645 } else {
ec98f782 3646 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3647 chained_nents += task->task_sg_nents;
97868c89 3648 }
c3c74c7a
NB		 3649 /*
3650 * For the padded tasks, use the extra SGL vector allocated
3651 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3652 * offset into sg_chain() above.
3653 *
3654 * We do not need the padding for the last task (or a single
3655 * task), but in that case we will never use the sg_prev_nents
3656 * value below which would be incorrect.
c3c74c7a 3657 */
04629b7b 3658 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3659 sg_prev = task->task_sg;
c66ac9db
NB		 3660 }
3661 /*
3662 * Setup the starting pointer and total t_tasks_sg_linked_no including
3663 * padding SGs for linking and to mark the end.
3664 */
a1d8b49a 3665 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3666 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3667
6708bb27 3668 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3669 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3670 cmd->t_tasks_sg_chained_no);
c66ac9db 3671
a1d8b49a
AG		 3672 for_each_sg(cmd->t_tasks_sg_chained, sg,
3673 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3674
6708bb27 3675 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3676 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3677 if (sg_is_chain(sg))
6708bb27 3678 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3679 if (sg_is_last(sg))
6708bb27 3680 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3681 }
c66ac9db
NB		 3682}
3683EXPORT_SYMBOL(transport_do_task_sg_chain);
3684
a1d8b49a
AG		 3685/*
3686 * Break up cmd into chunks transport can handle
3687 */
38b40067
CH		 3688static int
3689transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3690 enum dma_data_direction data_direction,
38b40067 3691 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3692{
5951146d 3693 struct se_device *dev = cmd->se_dev;
a3eedc22 3694 int task_count, i;
38b40067
CH		 3695 unsigned long long lba;
3696 sector_t sectors, dev_max_sectors;
3697 u32 sector_size;
3698
3699 if (transport_cmd_get_valid_sectors(cmd) < 0)
3700 return -EINVAL;
3701
3702 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3703 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
a1d8b49a 3704
ec98f782 3705 WARN_ON(cmd->data_length % sector_size);
38b40067
CH		 3706
3707 lba = cmd->t_task_lba;
ec98f782 3708 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27 3709 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
af3f00c7
CH		 3710
3711 /*
3712 * If we need just a single task reuse the SG list in the command
3713 * and avoid a lot of work.
3714 */
3715 if (task_count == 1) {
3716 struct se_task *task;
3717 unsigned long flags;
3718
3719 task = transport_generic_get_task(cmd, data_direction);
3720 if (!task)
3721 return -ENOMEM;
3722
3723 task->task_sg = cmd_sg;
3724 task->task_sg_nents = sgl_nents;
3725
3726 task->task_lba = lba;
3727 task->task_sectors = sectors;
3728 task->task_size = task->task_sectors * sector_size;
3729
3730 spin_lock_irqsave(&cmd->t_state_lock, flags);
3731 list_add_tail(&task->t_list, &cmd->t_task_list);
3732 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3733
3734 return task_count;
3735 }
3736
ec98f782 3737 for (i = 0; i < task_count; i++) {
38b40067 3738 struct se_task *task;
c3c74c7a 3739 unsigned int task_size, task_sg_nents_padded;
38b40067
CH		 3740 struct scatterlist *sg;
3741 unsigned long flags;
ec98f782 3742 int count;
a1d8b49a 3743
c66ac9db 3744 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3745 if (!task)
ec98f782 3746 return -ENOMEM;
c66ac9db 3747
c66ac9db 3748 task->task_lba = lba;
ec98f782
AG		 3749 task->task_sectors = min(sectors, dev_max_sectors);
3750 task->task_size = task->task_sectors * sector_size;
c66ac9db 3751
525a48a2
NB		 3752 /*
3753 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3754 * in order to calculate the number per task SGL entries
3755 */
3756 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3757 /*
ec98f782
AG		 3758 * Check if the fabric module driver is requesting that all
3759 * struct se_task->task_sg[] be chained together.. If so,
3760 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3761 * marking the end of the chained SGL for every task except
3762 * the last one for (task_count > 1) operation, or skipping
3763 * the extra padding for the (task_count == 1) case.
c66ac9db 3764 */
c3c74c7a
NB		 3765 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3766 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3767 } else
3768 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3769
1d20bb61 3770 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3771 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3772 if (!task->task_sg) {
3773 cmd->se_dev->transport->free_task(task);
3774 return -ENOMEM;
3775 }
3776
c3c74c7a 3777 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3778
ec98f782
AG		 3779 task_size = task->task_size;
3780
3781 /* Build new sgl, only up to task_size */
6708bb27 3782 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3783 if (cmd_sg->length > task_size)
3784 break;
3785
3786 *sg = *cmd_sg;
3787 task_size -= cmd_sg->length;
3788 cmd_sg = sg_next(cmd_sg);
c66ac9db 3789 }
c66ac9db 3790
ec98f782
AG		 3791 lba += task->task_sectors;
3792 sectors -= task->task_sectors;
c66ac9db 3793
ec98f782
AG		 3794 spin_lock_irqsave(&cmd->t_state_lock, flags);
3795 list_add_tail(&task->t_list, &cmd->t_task_list);
3796 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3797 }
3798
ec98f782 3799 return task_count;
c66ac9db
NB		 3800}
3801
3802static int
ec98f782 3803transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3804{
c66ac9db 3805 struct se_task *task;
ec98f782 3806 unsigned long flags;
c66ac9db 3807
91ec1d35
NB		 3808 /* Workaround for handling zero-length control CDBs */
3809 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3810 !cmd->data_length)
3811 return 0;
3812
c66ac9db
NB		 3813 task = transport_generic_get_task(cmd, cmd->data_direction);
3814 if (!task)
ec98f782 3815 return -ENOMEM;
c66ac9db 3816
af3f00c7 3817 task->task_sg = cmd->t_data_sg;
c66ac9db 3818 task->task_size = cmd->data_length;
6708bb27 3819 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3820
ec98f782
AG		 3821 spin_lock_irqsave(&cmd->t_state_lock, flags);
3822 list_add_tail(&task->t_list, &cmd->t_task_list);
3823 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3824
6708bb27 3825 /* Success! Return number of tasks allocated */
a3eedc22 3826 return 1;
ec98f782
AG		 3827}
3828
da0f7619
CH		 3829/*
3830 * Allocate any required ressources to execute the command, and either place
3831 * it on the execution queue if possible. For writes we might not have the
3832 * payload yet, thus notify the fabric via a call to ->write_pending instead.
c66ac9db 3833 */
a1d8b49a 3834int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3835{
da0f7619 3836 struct se_device *dev = cmd->se_dev;
9ac54987 3837 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3838 int set_counts = 1;
c66ac9db
NB		 3839 int ret = 0;
3840
3841 /*
3842 * Determine is the TCM fabric module has already allocated physical
3843 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3844 * beforehand.
c66ac9db 3845 */
ec98f782
AG		 3846 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3847 cmd->data_length) {
05d1c7c0 3848 ret = transport_generic_get_mem(cmd);
c66ac9db 3849 if (ret < 0)
03e98c9e 3850 goto out_fail;
c66ac9db 3851 }
da0f7619 3852
1d20bb61 3853 /*
38b40067 3854 * For BIDI command set up the read tasks first.
1d20bb61 3855 */
da0f7619 3856 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3857 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3858 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3859
9ac54987
NB		 3860 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3861 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3862 cmd->t_bidi_data_nents);
3863 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3864 goto out_fail;
3865
3866 atomic_inc(&cmd->t_fe_count);
3867 atomic_inc(&cmd->t_se_count);
3868 set_counts = 0;
3869 }
38b40067
CH		 3870
3871 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3872 task_cdbs = transport_allocate_data_tasks(cmd,
3873 cmd->data_direction, cmd->t_data_sg,
3874 cmd->t_data_nents);
3875 } else {
3876 task_cdbs = transport_allocate_control_task(cmd);
3877 }
3878
410f6702 3879 if (task_cdbs < 0)
da0f7619 3880 goto out_fail;
410f6702 3881 else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
7d680f3b 3882 spin_lock_irq(&cmd->t_state_lock);
410f6702 3883 cmd->t_state = TRANSPORT_COMPLETE;
7d680f3b
CH		 3884 cmd->transport_state |= CMD_T_ACTIVE;
3885 spin_unlock_irq(&cmd->t_state_lock);
91ec1d35
NB		 3886
3887 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3888 u8 ua_asc = 0, ua_ascq = 0;
3889
3890 core_scsi3_ua_clear_for_request_sense(cmd,
3891 &ua_asc, &ua_ascq);
3892 }
3893
410f6702
RD		 3894 INIT_WORK(&cmd->work, target_complete_ok_work);
3895 queue_work(target_completion_wq, &cmd->work);
3896 return 0;
3897 }
da0f7619
CH		 3898
3899 if (set_counts) {
3900 atomic_inc(&cmd->t_fe_count);
3901 atomic_inc(&cmd->t_se_count);
3902 }
3903
9ac54987
NB		 3904 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3905 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3906 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3907
c66ac9db 3908 /*
a1d8b49a 3909 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3910 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3911 * will be added to the struct se_device execution queue after its WRITE
3912 * data has arrived. (ie: It gets handled by the transport processing
3913 * thread a second time)
3914 */
3915 if (cmd->data_direction == DMA_TO_DEVICE) {
3916 transport_add_tasks_to_state_queue(cmd);
3917 return transport_generic_write_pending(cmd);
3918 }
3919 /*
3920 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3921 * to the execution queue.
3922 */
3923 transport_execute_tasks(cmd);
3924 return 0;
da0f7619
CH		 3925
3926out_fail:
3927 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3928 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3929 return -EINVAL;
c66ac9db 3930}
a1d8b49a 3931EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3932
3933/* transport_generic_process_write():
3934 *
3935 *
3936 */
3937void transport_generic_process_write(struct se_cmd *cmd)
3938{
c66ac9db
NB		 3939 transport_execute_tasks(cmd);
3940}
3941EXPORT_SYMBOL(transport_generic_process_write);
3942
e057f533 3943static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3944{
f147abb4
NB		 3945 int ret;
3946
3947 ret = cmd->se_tfo->write_pending(cmd);
3948 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3949 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3950 cmd);
3951 transport_handle_queue_full(cmd, cmd->se_dev);
3952 }
07bde79a
NB		 3953}
3954
c66ac9db
NB		 3955static int transport_generic_write_pending(struct se_cmd *cmd)
3956{
3957 unsigned long flags;
3958 int ret;
3959
a1d8b49a 3960 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3961 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3962 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3963
c66ac9db
NB		 3964 /*
3965 * Clear the se_cmd for WRITE_PENDING status in order to set
7d680f3b
CH		 3966 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3967 * from HW target mode interrupt code. This is safe to be called
3968 * with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3969 * because the se_cmd->se_lun pointer is not being cleared.
3970 */
3971 transport_cmd_check_stop(cmd, 1, 0);
3972
3973 /*
3974 * Call the fabric write_pending function here to let the
3975 * frontend know that WRITE buffers are ready.
3976 */
e3d6f909 3977 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3978 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3979 goto queue_full;
3980 else if (ret < 0)
c66ac9db
NB		 3981 return ret;
3982
03e98c9e 3983 return 1;
07bde79a
NB		 3984
3985queue_full:
6708bb27 3986 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3987 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3988 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3989 return 0;
c66ac9db
NB		 3990}
3991
39c05f32 3992void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3993{
d14921d6 3994 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 3995 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 3996 transport_wait_for_tasks(cmd);
3997
35462975 3998 transport_release_cmd(cmd);
d14921d6
NB		 3999 } else {
4000 if (wait_for_tasks)
4001 transport_wait_for_tasks(cmd);
4002
c66ac9db
NB		 4003 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4004
82f1c8a4 4005 if (cmd->se_lun)
c66ac9db 4006 transport_lun_remove_cmd(cmd);
c66ac9db 4007
f4366772
NB		 4008 transport_free_dev_tasks(cmd);
4009
39c05f32 4010 transport_put_cmd(cmd);
c66ac9db
NB		 4011 }
4012}
4013EXPORT_SYMBOL(transport_generic_free_cmd);
4014
a17f091d
NB		 4015/* target_get_sess_cmd - Add command to active ->sess_cmd_list
4016 * @se_sess: session to reference
4017 * @se_cmd: command descriptor to add
a6360785 4018 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 4019 */
a6360785
NB		 4020void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
4021 bool ack_kref)
a17f091d
NB		 4022{
4023 unsigned long flags;
4024
7481deb4 4025 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 4026 /*
4027 * Add a second kref if the fabric caller is expecting to handle
4028 * fabric acknowledgement that requires two target_put_sess_cmd()
4029 * invocations before se_cmd descriptor release.
4030 */
4031 if (ack_kref == true)
4032 kref_get(&se_cmd->cmd_kref);
7481deb4 4033
a17f091d
NB		 4034 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4035 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
4036 se_cmd->check_release = 1;
4037 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4038}
4039EXPORT_SYMBOL(target_get_sess_cmd);
4040
7481deb4 4041static void target_release_cmd_kref(struct kref *kref)
a17f091d 4042{
7481deb4
NB		 4043 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
4044 struct se_session *se_sess = se_cmd->se_sess;
a17f091d
NB		 4045 unsigned long flags;
4046
4047 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4048 if (list_empty(&se_cmd->se_cmd_list)) {
4049 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4050 WARN_ON(1);
7481deb4 4051 return;
a17f091d 4052 }
a17f091d
NB		 4053 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
4054 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4055 complete(&se_cmd->cmd_wait_comp);
7481deb4 4056 return;
a17f091d
NB		 4057 }
4058 list_del(&se_cmd->se_cmd_list);
4059 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4060
7481deb4
NB		 4061 se_cmd->se_tfo->release_cmd(se_cmd);
4062}
4063
4064/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4065 * @se_sess: session to reference
4066 * @se_cmd: command descriptor to drop
4067 */
4068int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4069{
4070 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 4071}
4072EXPORT_SYMBOL(target_put_sess_cmd);
4073
4074/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4075 * @se_sess: session to split
4076 */
4077void target_splice_sess_cmd_list(struct se_session *se_sess)
4078{
4079 struct se_cmd *se_cmd;
4080 unsigned long flags;
4081
4082 WARN_ON(!list_empty(&se_sess->sess_wait_list));
4083 INIT_LIST_HEAD(&se_sess->sess_wait_list);
4084
4085 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4086 se_sess->sess_tearing_down = 1;
4087
4088 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4089
4090 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4091 se_cmd->cmd_wait_set = 1;
4092
4093 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4094}
4095EXPORT_SYMBOL(target_splice_sess_cmd_list);
4096
4097/* target_wait_for_sess_cmds - Wait for outstanding descriptors
4098 * @se_sess: session to wait for active I/O
4099 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4100 */
4101void target_wait_for_sess_cmds(
4102 struct se_session *se_sess,
4103 int wait_for_tasks)
4104{
4105 struct se_cmd *se_cmd, *tmp_cmd;
4106 bool rc = false;
4107
4108 list_for_each_entry_safe(se_cmd, tmp_cmd,
4109 &se_sess->sess_wait_list, se_cmd_list) {
4110 list_del(&se_cmd->se_cmd_list);
4111
4112 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4113 " %d\n", se_cmd, se_cmd->t_state,
4114 se_cmd->se_tfo->get_cmd_state(se_cmd));
4115
4116 if (wait_for_tasks) {
4117 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4118 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4119 se_cmd->se_tfo->get_cmd_state(se_cmd));
4120
4121 rc = transport_wait_for_tasks(se_cmd);
4122
4123 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4124 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4125 se_cmd->se_tfo->get_cmd_state(se_cmd));
4126 }
4127
4128 if (!rc) {
4129 wait_for_completion(&se_cmd->cmd_wait_comp);
4130 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4131 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4132 se_cmd->se_tfo->get_cmd_state(se_cmd));
4133 }
4134
4135 se_cmd->se_tfo->release_cmd(se_cmd);
4136 }
4137}
4138EXPORT_SYMBOL(target_wait_for_sess_cmds);
4139
c66ac9db
NB		 4140/* transport_lun_wait_for_tasks():
4141 *
4142 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4143 * an struct se_lun to be successfully shutdown.
4144 */
4145static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4146{
4147 unsigned long flags;
4148 int ret;
4149 /*
4150 * If the frontend has already requested this struct se_cmd to
4151 * be stopped, we can safely ignore this struct se_cmd.
4152 */
a1d8b49a 4153 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 4154 if (cmd->transport_state & CMD_T_STOP) {
4155 cmd->transport_state &= ~CMD_T_LUN_STOP;
4156
4157 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
4158 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4159 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4160 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4161 return -EPERM;
c66ac9db 4162 }
7d680f3b 4163 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 4164 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4165
5951146d 4166 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4167
4168 ret = transport_stop_tasks_for_cmd(cmd);
4169
6708bb27
AG		 4170 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4171 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4172 if (!ret) {
6708bb27 4173 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4174 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4175 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4176 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4177 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4178 }
3df8d40b 4179 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4180
4181 return 0;
4182}
4183
c66ac9db
NB		 4184static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4185{
4186 struct se_cmd *cmd = NULL;
4187 unsigned long lun_flags, cmd_flags;
4188 /*
4189 * Do exception processing and return CHECK_CONDITION status to the
4190 * Initiator Port.
4191 */
4192 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4193 while (!list_empty(&lun->lun_cmd_list)) {
4194 cmd = list_first_entry(&lun->lun_cmd_list,
4195 struct se_cmd, se_lun_node);
3d26fea0 4196 list_del_init(&cmd->se_lun_node);
5951146d 4197
c66ac9db
NB		 4198 /*
4199 * This will notify iscsi_target_transport.c:
4200 * transport_cmd_check_stop() that a LUN shutdown is in
4201 * progress for the iscsi_cmd_t.
4202 */
a1d8b49a 4203 spin_lock(&cmd->t_state_lock);
6708bb27 4204 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4205 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4206 cmd->se_lun->unpacked_lun,
4207 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 4208 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 4209 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4210
4211 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4212
6708bb27
AG		 4213 if (!cmd->se_lun) {
4214 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4215 cmd->se_tfo->get_task_tag(cmd),
4216 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4217 BUG();
4218 }
4219 /*
4220 * If the Storage engine still owns the iscsi_cmd_t, determine
4221 * and/or stop its context.
4222 */
6708bb27 4223 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4224 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4225 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4226
e3d6f909 4227 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4228 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4229 continue;
4230 }
4231
6708bb27 4232 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4233 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4234 cmd->se_lun->unpacked_lun,
4235 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4236
a1d8b49a 4237 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 4238 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 4239 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4240 goto check_cond;
4241 }
7d680f3b 4242 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
c66ac9db 4243 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4244 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4245
4246 transport_free_dev_tasks(cmd);
4247 /*
4248 * The Storage engine stopped this struct se_cmd before it was
4249 * send to the fabric frontend for delivery back to the
4250 * Initiator Node. Return this SCSI CDB back with an
4251 * CHECK_CONDITION status.
4252 */
4253check_cond:
4254 transport_send_check_condition_and_sense(cmd,
4255 TCM_NON_EXISTENT_LUN, 0);
4256 /*
4257 * If the fabric frontend is waiting for this iscsi_cmd_t to
4258 * be released, notify the waiting thread now that LU has
4259 * finished accessing it.
4260 */
a1d8b49a 4261 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 4262 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 4263 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4264 " struct se_cmd: %p ITT: 0x%08x\n",
4265 lun->unpacked_lun,
e3d6f909 4266 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4267
a1d8b49a 4268 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4269 cmd_flags);
4270 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4271 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4272 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4273 continue;
4274 }
6708bb27 4275 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4276 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4277
a1d8b49a 4278 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4279 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4280 }
4281 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4282}
4283
4284static int transport_clear_lun_thread(void *p)
4285{
8359cf43 4286 struct se_lun *lun = p;
c66ac9db
NB		 4287
4288 __transport_clear_lun_from_sessions(lun);
4289 complete(&lun->lun_shutdown_comp);
4290
4291 return 0;
4292}
4293
4294int transport_clear_lun_from_sessions(struct se_lun *lun)
4295{
4296 struct task_struct *kt;
4297
5951146d 4298 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4299 "tcm_cl_%u", lun->unpacked_lun);
4300 if (IS_ERR(kt)) {
6708bb27 4301 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4302 return PTR_ERR(kt);
c66ac9db
NB		 4303 }
4304 wait_for_completion(&lun->lun_shutdown_comp);
4305
4306 return 0;
4307}
4308
d14921d6
NB		 4309/**
4310 * transport_wait_for_tasks - wait for completion to occur
4311 * @cmd: command to wait
c66ac9db 4312 *
d14921d6
NB		 4313 * Called from frontend fabric context to wait for storage engine
4314 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4315 */
a17f091d 4316bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4317{
4318 unsigned long flags;
4319
a1d8b49a 4320 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 4321 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
4322 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 4323 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4324 return false;
d14921d6
NB		 4325 }
4326 /*
4327 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4328 * has been set in transport_set_supported_SAM_opcode().
4329 */
c8e31f26
AG		 4330 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
4331 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 4332 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4333 return false;
d14921d6 4334 }
c66ac9db
NB		 4335 /*
4336 * If we are already stopped due to an external event (ie: LUN shutdown)
4337 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4338 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4339 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4340 * has completed its operation on the struct se_cmd.
4341 */
7d680f3b 4342 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 4343 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4344 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4345 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4346 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4347 /*
4348 * There is a special case for WRITES where a FE exception +
4349 * LUN shutdown means ConfigFS context is still sleeping on
4350 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4351 * We go ahead and up transport_lun_stop_comp just to be sure
4352 * here.
4353 */
a1d8b49a
AG		 4354 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4355 complete(&cmd->transport_lun_stop_comp);
4356 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4357 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4358
4359 transport_all_task_dev_remove_state(cmd);
4360 /*
4361 * At this point, the frontend who was the originator of this
4362 * struct se_cmd, now owns the structure and can be released through
4363 * normal means below.
4364 */
6708bb27 4365 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4366 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4367 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4368 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4369
7d680f3b 4370 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 4371 }
7d680f3b
CH		 4372
4373 if (!(cmd->transport_state & CMD_T_ACTIVE) ||
4374 (cmd->transport_state & CMD_T_ABORTED)) {
d14921d6 4375 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4376 return false;
d14921d6 4377 }
c66ac9db 4378
7d680f3b 4379 cmd->transport_state |= CMD_T_STOP;
c66ac9db 4380
6708bb27 4381 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 4382 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 4383 cmd, cmd->se_tfo->get_task_tag(cmd),
4384 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4385
a1d8b49a 4386 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4387
5951146d 4388 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4389
a1d8b49a 4390 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4391
a1d8b49a 4392 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 4393 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 4394
6708bb27 4395 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4396 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4397 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4398
d14921d6 4399 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4400
4401 return true;
c66ac9db 4402}
d14921d6 4403EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4404
4405static int transport_get_sense_codes(
4406 struct se_cmd *cmd,
4407 u8 *asc,
4408 u8 *ascq)
4409{
4410 *asc = cmd->scsi_asc;
4411 *ascq = cmd->scsi_ascq;
4412
4413 return 0;
4414}
4415
4416static int transport_set_sense_codes(
4417 struct se_cmd *cmd,
4418 u8 asc,
4419 u8 ascq)
4420{
4421 cmd->scsi_asc = asc;
4422 cmd->scsi_ascq = ascq;
4423
4424 return 0;
4425}
4426
4427int transport_send_check_condition_and_sense(
4428 struct se_cmd *cmd,
4429 u8 reason,
4430 int from_transport)
4431{
4432 unsigned char *buffer = cmd->sense_buffer;
4433 unsigned long flags;
4434 int offset;
4435 u8 asc = 0, ascq = 0;
4436
a1d8b49a 4437 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4438 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4439 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4440 return 0;
4441 }
4442 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4443 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4444
4445 if (!reason && from_transport)
4446 goto after_reason;
4447
4448 if (!from_transport)
4449 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4450 /*
4451 * Data Segment and SenseLength of the fabric response PDU.
4452 *
4453 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4454 * from include/scsi/scsi_cmnd.h
4455 */
e3d6f909 4456 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4457 TRANSPORT_SENSE_BUFFER);
4458 /*
4459 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4460 * SENSE KEY values from include/scsi/scsi.h
4461 */
4462 switch (reason) {
4463 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4464 /* CURRENT ERROR */
4465 buffer[offset] = 0x70;
895f3022 4466 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340
NB		 4467 /* ILLEGAL REQUEST */
4468 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4469 /* LOGICAL UNIT NOT SUPPORTED */
4470 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4471 break;
c66ac9db
NB		 4472 case TCM_UNSUPPORTED_SCSI_OPCODE:
4473 case TCM_SECTOR_COUNT_TOO_MANY:
4474 /* CURRENT ERROR */
4475 buffer[offset] = 0x70;
895f3022 4476 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4477 /* ILLEGAL REQUEST */
4478 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4479 /* INVALID COMMAND OPERATION CODE */
4480 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4481 break;
4482 case TCM_UNKNOWN_MODE_PAGE:
4483 /* CURRENT ERROR */
4484 buffer[offset] = 0x70;
895f3022 4485 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4486 /* ILLEGAL REQUEST */
4487 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4488 /* INVALID FIELD IN CDB */
4489 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4490 break;
4491 case TCM_CHECK_CONDITION_ABORT_CMD:
4492 /* CURRENT ERROR */
4493 buffer[offset] = 0x70;
895f3022 4494 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4495 /* ABORTED COMMAND */
4496 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4497 /* BUS DEVICE RESET FUNCTION OCCURRED */
4498 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4499 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4500 break;
4501 case TCM_INCORRECT_AMOUNT_OF_DATA:
4502 /* CURRENT ERROR */
4503 buffer[offset] = 0x70;
895f3022 4504 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4505 /* ABORTED COMMAND */
4506 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4507 /* WRITE ERROR */
4508 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4509 /* NOT ENOUGH UNSOLICITED DATA */
4510 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4511 break;
4512 case TCM_INVALID_CDB_FIELD:
4513 /* CURRENT ERROR */
4514 buffer[offset] = 0x70;
895f3022 4515 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4516 /* ILLEGAL REQUEST */
4517 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4518 /* INVALID FIELD IN CDB */
4519 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4520 break;
4521 case TCM_INVALID_PARAMETER_LIST:
4522 /* CURRENT ERROR */
4523 buffer[offset] = 0x70;
895f3022 4524 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909
RD		 4525 /* ILLEGAL REQUEST */
4526 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db
NB		 4527 /* INVALID FIELD IN PARAMETER LIST */
4528 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4529 break;
4530 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4531 /* CURRENT ERROR */
4532 buffer[offset] = 0x70;
895f3022 4533 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4534 /* ABORTED COMMAND */
4535 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4536 /* WRITE ERROR */
4537 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4538 /* UNEXPECTED_UNSOLICITED_DATA */
4539 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4540 break;
4541 case TCM_SERVICE_CRC_ERROR:
4542 /* CURRENT ERROR */
4543 buffer[offset] = 0x70;
895f3022 4544 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4545 /* ABORTED COMMAND */
4546 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4547 /* PROTOCOL SERVICE CRC ERROR */
4548 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4549 /* N/A */
4550 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4551 break;
4552 case TCM_SNACK_REJECTED:
4553 /* CURRENT ERROR */
4554 buffer[offset] = 0x70;
895f3022 4555 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4556 /* ABORTED COMMAND */
4557 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4558 /* READ ERROR */
4559 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4560 /* FAILED RETRANSMISSION REQUEST */
4561 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4562 break;
4563 case TCM_WRITE_PROTECTED:
4564 /* CURRENT ERROR */
4565 buffer[offset] = 0x70;
895f3022 4566 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4567 /* DATA PROTECT */
4568 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4569 /* WRITE PROTECTED */
4570 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4571 break;
4572 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4573 /* CURRENT ERROR */
4574 buffer[offset] = 0x70;
895f3022 4575 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4576 /* UNIT ATTENTION */
4577 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4578 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4579 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4580 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4581 break;
4582 case TCM_CHECK_CONDITION_NOT_READY:
4583 /* CURRENT ERROR */
4584 buffer[offset] = 0x70;
895f3022 4585 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4586 /* Not Ready */
4587 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4588 transport_get_sense_codes(cmd, &asc, &ascq);
4589 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4590 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4591 break;
4592 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4593 default:
4594 /* CURRENT ERROR */
4595 buffer[offset] = 0x70;
895f3022 4596 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db
NB		 4597 /* ILLEGAL REQUEST */
4598 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4599 /* LOGICAL UNIT COMMUNICATION FAILURE */
4600 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4601 break;
4602 }
4603 /*
4604 * This code uses linux/include/scsi/scsi.h SAM status codes!
4605 */
4606 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4607 /*
4608 * Automatically padded, this value is encoded in the fabric's
4609 * data_length response PDU containing the SCSI defined sense data.
4610 */
4611 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4612
4613after_reason:
07bde79a 4614 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4615}
4616EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4617
4618int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4619{
4620 int ret = 0;
4621
7d680f3b 4622 if (cmd->transport_state & CMD_T_ABORTED) {
6708bb27 4623 if (!send_status ||
c66ac9db
NB		 4624 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4625 return 1;
4626#if 0
6708bb27 4627 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4628 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4629 cmd->t_task_cdb[0],
e3d6f909 4630 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4631#endif
4632 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4633 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4634 ret = 1;
4635 }
4636 return ret;
4637}
4638EXPORT_SYMBOL(transport_check_aborted_status);
4639
4640void transport_send_task_abort(struct se_cmd *cmd)
4641{
c252f003
NB		 4642 unsigned long flags;
4643
4644 spin_lock_irqsave(&cmd->t_state_lock, flags);
4645 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4646 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4647 return;
4648 }
4649 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4650
c66ac9db
NB		 4651 /*
4652 * If there are still expected incoming fabric WRITEs, we wait
4653 * until until they have completed before sending a TASK_ABORTED
4654 * response. This response with TASK_ABORTED status will be
4655 * queued back to fabric module by transport_check_aborted_status().
4656 */
4657 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4658 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 4659 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 4660 smp_mb__after_atomic_inc();
c66ac9db
NB		 4661 }
4662 }
4663 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4664#if 0
6708bb27 4665 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4666 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4667 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4668#endif
e3d6f909 4669 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4670}
4671
e26d99ae 4672static int transport_generic_do_tmr(struct se_cmd *cmd)
c66ac9db 4673{
5951146d 4674 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4675 struct se_tmr_req *tmr = cmd->se_tmr_req;
4676 int ret;
4677
4678 switch (tmr->function) {
5c6cd613 4679 case TMR_ABORT_TASK:
c66ac9db
NB		 4680 tmr->response = TMR_FUNCTION_REJECTED;
4681 break;
5c6cd613
NB		 4682 case TMR_ABORT_TASK_SET:
4683 case TMR_CLEAR_ACA:
4684 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4685 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4686 break;
5c6cd613 4687 case TMR_LUN_RESET:
c66ac9db
NB		 4688 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4689 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4690 TMR_FUNCTION_REJECTED;
4691 break;
5c6cd613 4692 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4693 tmr->response = TMR_FUNCTION_REJECTED;
4694 break;
5c6cd613 4695 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4696 tmr->response = TMR_FUNCTION_REJECTED;
4697 break;
c66ac9db 4698 default:
6708bb27 4699 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4700 tmr->function);
4701 tmr->response = TMR_FUNCTION_REJECTED;
4702 break;
4703 }
4704
4705 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4706 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4707
b7b8bef7 4708 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4709 return 0;
4710}
4711
c66ac9db
NB		 4712/* transport_processing_thread():
4713 *
4714 *
4715 */
4716static int transport_processing_thread(void *param)
4717{
5951146d 4718 int ret;
c66ac9db 4719 struct se_cmd *cmd;
8359cf43 4720 struct se_device *dev = param;
c66ac9db 4721
c66ac9db 4722 while (!kthread_should_stop()) {
e3d6f909
AG		 4723 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4724 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4725 kthread_should_stop());
4726 if (ret < 0)
4727 goto out;
4728
c66ac9db 4729get_cmd:
5951146d
AG		 4730 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4731 if (!cmd)
c66ac9db
NB		 4732 continue;
4733
5951146d 4734 switch (cmd->t_state) {
680b73c5
CH		 4735 case TRANSPORT_NEW_CMD:
4736 BUG();
4737 break;
c66ac9db 4738 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4739 if (!cmd->se_tfo->new_cmd_map) {
4740 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4741 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4742 BUG();
4743 }
e3d6f909 4744 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4745 if (ret < 0) {
03e98c9e 4746 transport_generic_request_failure(cmd);
c66ac9db
NB		 4747 break;
4748 }
c66ac9db 4749 ret = transport_generic_new_cmd(cmd);
f147abb4 4750 if (ret < 0) {
03e98c9e
NB		 4751 transport_generic_request_failure(cmd);
4752 break;
c66ac9db
NB		 4753 }
4754 break;
4755 case TRANSPORT_PROCESS_WRITE:
4756 transport_generic_process_write(cmd);
4757 break;
c66ac9db
NB		 4758 case TRANSPORT_PROCESS_TMR:
4759 transport_generic_do_tmr(cmd);
4760 break;
07bde79a 4761 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4762 transport_write_pending_qf(cmd);
4763 break;
4764 case TRANSPORT_COMPLETE_QF_OK:
4765 transport_complete_qf(cmd);
07bde79a 4766 break;
c66ac9db 4767 default:
f2da9dbd
CH		 4768 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4769 "i_state: %d on SE LUN: %u\n",
4770 cmd->t_state,
e3d6f909
AG		 4771 cmd->se_tfo->get_task_tag(cmd),
4772 cmd->se_tfo->get_cmd_state(cmd),
4773 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4774 BUG();
4775 }
4776
4777 goto get_cmd;
4778 }
4779
4780out:
ce8762f6
NB		 4781 WARN_ON(!list_empty(&dev->state_task_list));
4782 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4783 dev->process_thread = NULL;
4784 return 0;
4785}