summaryrefslogtreecommitdiffstats
path: root/examples/vhost/main.c
blob: 1f532fe3ba2ef5c2668c9133fc907f91b20f4d09 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2017 Intel Corporation. All rights reserved.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <arpa/inet.h>
#include <getopt.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/virtio_net.h>
#include <linux/virtio_ring.h>
#include <signal.h>
#include <stdint.h>
#include <sys/eventfd.h>
#include <sys/param.h>
#include <unistd.h>

#include <rte_atomic.h>
#include <rte_cycles.h>
#include <rte_ethdev.h>
#include <rte_log.h>
#include <rte_string_fns.h>
#include <rte_malloc.h>
#include <rte_vhost.h>
#include <rte_ip.h>
#include <rte_tcp.h>
#include <rte_pause.h>

#include "main.h"

#ifndef MAX_QUEUES
#define MAX_QUEUES 128
#endif

/* the maximum number of external ports supported */
#define MAX_SUP_PORTS 1

#define MBUF_CACHE_SIZE	128
#define MBUF_DATA_SIZE	RTE_MBUF_DEFAULT_BUF_SIZE

#define BURST_TX_DRAIN_US 100	/* TX drain every ~100us */

#define BURST_RX_WAIT_US 15	/* Defines how long we wait between retries on RX */
#define BURST_RX_RETRIES 4		/* Number of retries on RX. */

#define JUMBO_FRAME_MAX_SIZE    0x2600

/* State of virtio device. */
#define DEVICE_MAC_LEARNING 0
#define DEVICE_RX			1
#define DEVICE_SAFE_REMOVE	2

/* Configurable number of RX/TX ring descriptors */
#define RTE_TEST_RX_DESC_DEFAULT 1024
#define RTE_TEST_TX_DESC_DEFAULT 512

#define INVALID_PORT_ID 0xFF

/* Max number of devices. Limited by vmdq. */
#define MAX_DEVICES 64

/* Size of buffers used for snprintfs. */
#define MAX_PRINT_BUFF 6072

/* Maximum long option length for option parsing. */
#define MAX_LONG_OPT_SZ 64

/* mask of enabled ports */
static uint32_t enabled_port_mask = 0;

/* Promiscuous mode */
static uint32_t promiscuous;

/* number of devices/queues to support*/
static uint32_t num_queues = 0;
static uint32_t num_devices;

static struct rte_mempool *mbuf_pool;
static int mergeable;

/* Enable VM2VM communications. If this is disabled then the MAC address compare is skipped. */
typedef enum {
	VM2VM_DISABLED = 0,
	VM2VM_SOFTWARE = 1,
	VM2VM_HARDWARE = 2,
	VM2VM_LAST
} vm2vm_type;
static vm2vm_type vm2vm_mode = VM2VM_SOFTWARE;

/* Enable stats. */
static uint32_t enable_stats = 0;
/* Enable retries on RX. */
static uint32_t enable_retry = 1;

/* Disable TX checksum offload */
static uint32_t enable_tx_csum;

/* Disable TSO offload */
static uint32_t enable_tso;

static int client_mode;
static int dequeue_zero_copy;

static int builtin_net_driver;

/* Specify timeout (in useconds) between retries on RX. */
static uint32_t burst_rx_delay_time = BURST_RX_WAIT_US;
/* Specify the number of retries on RX. */
static uint32_t burst_rx_retry_num = BURST_RX_RETRIES;

/* Socket file paths. Can be set by user */
static char *socket_files;
static int nb_sockets;

/* empty vmdq configuration structure. Filled in programatically */
static struct rte_eth_conf vmdq_conf_default = {
	.rxmode = {
		.mq_mode        = ETH_MQ_RX_VMDQ_ONLY,
		.split_hdr_size = 0,
		.header_split   = 0, /**< Header Split disabled */
		.hw_ip_checksum = 0, /**< IP checksum offload disabled */
		.hw_vlan_filter = 0, /**< VLAN filtering disabled */
		/*
		 * It is necessary for 1G NIC such as I350,
		 * this fixes bug of ipv4 forwarding in guest can't
		 * forward pakets from one virtio dev to another virtio dev.
		 */
		.hw_vlan_strip  = 1, /**< VLAN strip enabled. */
		.jumbo_frame    = 0, /**< Jumbo Frame Support disabled */
		.hw_strip_crc   = 1, /**< CRC stripped by hardware */
	},

	.txmode = {
		.mq_mode = ETH_MQ_TX_NONE,
	},
	.rx_adv_conf = {
		/*
		 * should be overridden separately in code with
		 * appropriate values
		 */
		.vmdq_rx_conf = {
			.nb_queue_pools = ETH_8_POOLS,
			.enable_default_pool = 0,
			.default_pool = 0,
			.nb_pool_maps = 0,
			.pool_map = {{0, 0},},
		},
	},
};

static unsigned lcore_ids[RTE_MAX_LCORE];
static uint16_t ports[RTE_MAX_ETHPORTS];
static unsigned num_ports = 0; /**< The number of ports specified in command line */
static uint16_t num_pf_queues, num_vmdq_queues;
static uint16_t vmdq_pool_base, vmdq_queue_base;
static uint16_t queues_per_pool;

const uint16_t vlan_tags[] = {
	1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007,
	1008, 1009, 1010, 1011,	1012, 1013, 1014, 1015,
	1016, 1017, 1018, 1019, 1020, 1021, 1022, 1023,
	1024, 1025, 1026, 1027, 1028, 1029, 1030, 1031,
	1032, 1033, 1034, 1035, 1036, 1037, 1038, 1039,
	1040, 1041, 1042, 1043, 1044, 1045, 1046, 1047,
	1048, 1049, 1050, 1051, 1052, 1053, 1054, 1055,
	1056, 1057, 1058, 1059, 1060, 1061, 1062, 1063,
};

/* ethernet addresses of ports */
static struct ether_addr vmdq_ports_eth_addr[RTE_MAX_ETHPORTS];

static struct vhost_dev_tailq_list vhost_dev_list =
	TAILQ_HEAD_INITIALIZER(vhost_dev_list);

static struct lcore_info lcore_info[RTE_MAX_LCORE];

/* Used for queueing bursts of TX packets. */
struct mbuf_table {
	unsigned len;
	unsigned txq_id;
	struct rte_mbuf *m_table[MAX_PKT_BURST];
};

/* TX queue for each data core. */
struct mbuf_table lcore_tx_queue[RTE_MAX_LCORE];

#define MBUF_TABLE_DRAIN_TSC	((rte_get_tsc_hz() + US_PER_S - 1) \
				 / US_PER_S * BURST_TX_DRAIN_US)
#define VLAN_HLEN       4

/*
 * Builds up the correct configuration for VMDQ VLAN pool map
 * according to the pool & queue limits.
 */
static inline int
get_eth_conf(struct rte_eth_conf *eth_conf, uint32_t num_devices)
{
	struct rte_eth_vmdq_rx_conf conf;
	struct rte_eth_vmdq_rx_conf *def_conf =
		&vmdq_conf_default.rx_adv_conf.vmdq_rx_conf;
	unsigned i;

	memset(&conf, 0, sizeof(conf));
	conf.nb_queue_pools = (enum rte_eth_nb_pools)num_devices;
	conf.nb_pool_maps = num_devices;
	conf.enable_loop_back = def_conf->enable_loop_back;
	conf.rx_mode = def_conf->rx_mode;

	for (i = 0; i < conf.nb_pool_maps; i++) {
		conf.pool_map[i].vlan_id = vlan_tags[ i ];
		conf.pool_map[i].pools = (1UL << i);
	}

	(void)(rte_memcpy(eth_conf, &vmdq_conf_default, sizeof(*eth_conf)));
	(void)(rte_memcpy(&eth_conf->rx_adv_conf.vmdq_rx_conf, &conf,
		   sizeof(eth_conf->rx_adv_conf.vmdq_rx_conf)));
	return 0;
}

/*
 * Validate the device number according to the max pool number gotten form
 * dev_info. If the device number is invalid, give the error message and
 * return -1. Each device must have its own pool.
 */
static inline int
validate_num_devices(uint32_t max_nb_devices)
{
	if (num_devices > max_nb_devices) {
		RTE_LOG(ERR, VHOST_PORT, "invalid number of devices\n");
		return -1;
	}
	return 0;
}

/*
 * Initialises a given port using global settings and with the rx buffers
 * coming from the mbuf_pool passed as parameter
 */
static inline int
port_init(uint16_t port)
{
	struct rte_eth_dev_info dev_info;
	struct rte_eth_conf port_conf;
	struct rte_eth_rxconf *rxconf;
	struct rte_eth_txconf *txconf;
	int16_t rx_rings, tx_rings;
	uint16_t rx_ring_size, tx_ring_size;
	int retval;
	uint16_t q;

	/* The max pool number from dev_info will be used to validate the pool number specified in cmd line */
	rte_eth_dev_info_get (port, &dev_info);

	rxconf = &dev_info.default_rxconf;
	txconf = &dev_info.default_txconf;
	rxconf->rx_drop_en = 1;

	/* Enable vlan offload */
	txconf->txq_flags &= ~ETH_TXQ_FLAGS_NOVLANOFFL;

	/*configure the number of supported virtio devices based on VMDQ limits */
	num_devices = dev_info.max_vmdq_pools;

	rx_ring_size = RTE_TEST_RX_DESC_DEFAULT;
	tx_ring_size = RTE_TEST_TX_DESC_DEFAULT;

	/*
	 * When dequeue zero copy is enabled, guest Tx used vring will be
	 * updated only when corresponding mbuf is freed. Thus, the nb_tx_desc
	 * (tx_ring_size here) must be small enough so that the driver will
	 * hit the free threshold easily and free mbufs timely. Otherwise,
	 * guest Tx vring would be starved.
	 */
	if (dequeue_zero_copy)
		tx_ring_size = 64;

	tx_rings = (uint16_t)rte_lcore_count();

	retval = validate_num_devices(MAX_DEVICES);
	if (retval < 0)
		return retval;

	/* Get port configuration. */
	retval = get_eth_conf(&port_conf, num_devices);
	if (retval < 0)
		return retval;
	/* NIC queues are divided into pf queues and vmdq queues.  */
	num_pf_queues = dev_info.max_rx_queues - dev_info.vmdq_queue_num;
	queues_per_pool = dev_info.vmdq_queue_num / dev_info.max_vmdq_pools;
	num_vmdq_queues = num_devices * queues_per_pool;
	num_queues = num_pf_queues + num_vmdq_queues;
	vmdq_queue_base = dev_info.vmdq_queue_base;
	vmdq_pool_base  = dev_info.vmdq_pool_base;
	printf("pf queue num: %u, configured vmdq pool num: %u, each vmdq pool has %u queues\n",
		num_pf_queues, num_devices, queues_per_pool);

	if (port >= rte_eth_dev_count()) return -1;

	rx_rings = (uint16_t)dev_info.max_rx_queues;
	/* Configure ethernet device. */
	retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
	if (retval != 0) {
		RTE_LOG(ERR, VHOST_PORT, "Failed to configure port %u: %s.\n",
			port, strerror(-retval));
		return retval;
	}

	retval = rte_eth_dev_adjust_nb_rx_tx_desc(port, &rx_ring_size,
		&tx_ring_size);
	if (retval != 0) {
		RTE_LOG(ERR, VHOST_PORT, "Failed to adjust number of descriptors "
			"for port %u: %s.\n", port, strerror(-retval));
		return retval;
	}
	if (rx_ring_size > RTE_TEST_RX_DESC_DEFAULT) {
		RTE_LOG(ERR, VHOST_PORT, "Mbuf pool has an insufficient size "
			"for Rx queues on port %u.\n", port);
		return -1;
	}

	/* Setup the queues. */
	for (q = 0; q < rx_rings; q ++) {
		retval = rte_eth_rx_queue_setup(port, q, rx_ring_size,
						rte_eth_dev_socket_id(port),
						rxconf,
						mbuf_pool);
		if (retval < 0) {
			RTE_LOG(ERR, VHOST_PORT,
				"Failed to setup rx queue %u of port %u: %s.\n",
				q, port, strerror(-retval));
			return retval;
		}
	}
	for (q = 0; q < tx_rings; q ++) {
		retval = rte_eth_tx_queue_setup(port, q, tx_ring_size,
						rte_eth_dev_socket_id(port),
						txconf);
		if (retval < 0) {
			RTE_LOG(ERR, VHOST_PORT,
				"Failed to setup tx queue %u of port %u: %s.\n",
				q, port, strerror(-retval));
			return retval;
		}
	}

	/* Start the device. */
	retval  = rte_eth_dev_start(port);
	if (retval < 0) {
		RTE_LOG(ERR, VHOST_PORT, "Failed to start port %u: %s\n",
			port, strerror(-retval));
		return retval;
	}

	if (promiscuous)
		rte_eth_promiscuous_enable(port);

	rte_eth_macaddr_get(port, &vmdq_ports_eth_addr[port]);
	RTE_LOG(INFO, VHOST_PORT, "Max virtio devices supported: %u\n", num_devices);
	RTE_LOG(INFO, VHOST_PORT, "Port %u MAC: %02"PRIx8" %02"PRIx8" %02"PRIx8
			" %02"PRIx8" %02"PRIx8" %02"PRIx8"\n",
			port,
			vmdq_ports_eth_addr[port].addr_bytes[0],
			vmdq_ports_eth_addr[port].addr_bytes[1],
			vmdq_ports_eth_addr[port].addr_bytes[2],
			vmdq_ports_eth_addr[port].addr_bytes[3],
			vmdq_ports_eth_addr[port].addr_bytes[4],
			vmdq_ports_eth_addr[port].addr_bytes[5]);

	return 0;
}

/*
 * Set socket file path.
 */
static int
us_vhost_parse_socket_path(const char *q_arg)
{
	/* parse number string */
	if (strnlen(q_arg, PATH_MAX) == PATH_MAX)
		return -1;

	socket_files = realloc(socket_files, PATH_MAX * (nb_sockets + 1));
	snprintf(socket_files + nb_sockets * PATH_MAX, PATH_MAX, "%s", q_arg);
	nb_sockets++;

	return 0;
}

/*
 * Parse the portmask provided at run time.
 */
static int
parse_portmask(const char *portmask)
{
	char *end = NULL;
	unsigned long pm;

	errno = 0;

	/* parse hexadecimal string */
	pm = strtoul(portmask, &end, 16);
	if ((portmask[0] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0))
		return -1;

	if (pm == 0)
		return -1;

	return pm;

}

/*
 * Parse num options at run time.
 */
static int
parse_num_opt(const char *q_arg, uint32_t max_valid_value)
{
	char *end = NULL;
	unsigned long num;

	errno = 0;

	/* parse unsigned int string */
	num = strtoul(q_arg, &end, 10);
	if ((q_arg[0] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0))
		return -1;

	if (num > max_valid_value)
		return -1;

	return num;

}

/*
 * Display usage
 */
static void
us_vhost_usage(const char *prgname)
{
	RTE_LOG(INFO, VHOST_CONFIG, "%s [EAL options] -- -p PORTMASK\n"
	"		--vm2vm [0|1|2]\n"
	"		--rx_retry [0|1] --mergeable [0|1] --stats [0-N]\n"
	"		--socket-file <path>\n"
	"		--nb-devices ND\n"
	"		-p PORTMASK: Set mask for ports to be used by application\n"
	"		--vm2vm [0|1|2]: disable/software(default)/hardware vm2vm comms\n"
	"		--rx-retry [0|1]: disable/enable(default) retries on rx. Enable retry if destintation queue is full\n"
	"		--rx-retry-delay [0-N]: timeout(in usecond) between retries on RX. This makes effect only if retries on rx enabled\n"
	"		--rx-retry-num [0-N]: the number of retries on rx. This makes effect only if retries on rx enabled\n"
	"		--mergeable [0|1]: disable(default)/enable RX mergeable buffers\n"
	"		--stats [0-N]: 0: Disable stats, N: Time in seconds to print stats\n"
	"		--socket-file: The path of the socket file.\n"
	"		--tx-csum [0|1] disable/enable TX checksum offload.\n"
	"		--tso [0|1] disable/enable TCP segment offload.\n"
	"		--client register a vhost-user socket as client mode.\n"
	"		--dequeue-zero-copy enables dequeue zero copy\n",
	       prgname);
}

/*
 * Parse the arguments given in the command line of the application.
 */
static int
us_vhost_parse_args(int argc, char **argv)
{
	int opt, ret;
	int option_index;
	unsigned i;
	const char *prgname = argv[0];
	static struct option long_option[] = {
		{"vm2vm", required_argument, NULL, 0},
		{"rx-retry", required_argument, NULL, 0},
		{"rx-retry-delay", required_argument, NULL, 0},
		{"rx-retry-num", required_argument, NULL, 0},
		{"mergeable", required_argument, NULL, 0},
		{"stats", required_argument, NULL, 0},
		{"socket-file", required_argument, NULL, 0},
		{"tx-csum", required_argument, NULL, 0},
		{"tso", required_argument, NULL, 0},
		{"client", no_argument, &client_mode, 1},
		{"dequeue-zero-copy", no_argument, &dequeue_zero_copy, 1},
		{"builtin-net-driver", no_argument, &builtin_net_driver, 1},
		{NULL, 0, 0, 0},
	};

	/* Parse command line */
	while ((opt = getopt_long(argc, argv, "p:P",
			long_option, &option_index)) != EOF) {
		switch (opt) {
		/* Portmask */
		case 'p':
			enabled_port_mask = parse_portmask(optarg);
			if (enabled_port_mask == 0) {
				RTE_LOG(INFO, VHOST_CONFIG, "Invalid portmask\n");
				us_vhost_usage(prgname);
				return -1;
			}
			break;

		case 'P':
			promiscuous = 1;
			vmdq_conf_default.rx_adv_conf.vmdq_rx_conf.rx_mode =
				ETH_VMDQ_ACCEPT_BROADCAST |
				ETH_VMDQ_ACCEPT_MULTICAST;

			break;

		case 0:
			/* Enable/disable vm2vm comms. */
			if (!strncmp(long_option[option_index].name, "vm2vm",
				MAX_LONG_OPT_SZ)) {
				ret = parse_num_opt(optarg, (VM2VM_LAST - 1));
				if (ret == -1) {
					RTE_LOG(INFO, VHOST_CONFIG,
						"Invalid argument for "
						"vm2vm [0|1|2]\n");
					us_vhost_usage(prgname);
					return -1;
				} else {
					vm2vm_mode = (vm2vm_type)ret;
				}
			}

			/* Enable/disable retries on RX. */
			if (!strncmp(long_option[option_index].name, "rx-retry", MAX_LONG_OPT_SZ)) {
				ret = parse_num_opt(optarg, 1);
				if (ret == -1) {
					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for rx-retry [0|1]\n");
					us_vhost_usage(prgname);
					return -1;
				} else {
					enable_retry = ret;
				}
			}

			/* Enable/disable TX checksum offload. */
			if (!strncmp(long_option[option_index].name, "tx-csum", MAX_LONG_OPT_SZ)) {
				ret = parse_num_opt(optarg, 1);
				if (ret == -1) {
					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for tx-csum [0|1]\n");
					us_vhost_usage(prgname);
					return -1;
				} else
					enable_tx_csum = ret;
			}

			/* Enable/disable TSO offload. */
			if (!strncmp(long_option[option_index].name, "tso", MAX_LONG_OPT_SZ)) {
				ret = parse_num_opt(optarg, 1);
				if (ret == -1) {
					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for tso [0|1]\n");
					us_vhost_usage(prgname);
					return -1;
				} else
					enable_tso = ret;
			}

			/* Specify the retries delay time (in useconds) on RX. */
			if (!strncmp(long_option[option_index].name, "rx-retry-delay", MAX_LONG_OPT_SZ)) {
				ret = parse_num_opt(optarg, INT32_MAX);
				if (ret == -1) {
					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for rx-retry-delay [0-N]\n");
					us_vhost_usage(prgname);
					return -1;
				} else {
					burst_rx_delay_time = ret;
				}
			}

			/* Specify the retries number on RX. */
			if (!strncmp(long_option[option_index].name, "rx-retry-num", MAX_LONG_OPT_SZ)) {
				ret = parse_num_opt(optarg, INT32_MAX);
				if (ret == -1) {
					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for rx-retry-num [0-N]\n");
					us_vhost_usage(prgname);
					return -1;
				} else {
					burst_rx_retry_num = ret;
				}
			}

			/* Enable/disable RX mergeable buffers. */
			if (!strncmp(long_option[option_index].name, "mergeable", MAX_LONG_OPT_SZ)) {
				ret = parse_num_opt(optarg, 1);
				if (ret == -1) {
					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for mergeable [0|1]\n");
					us_vhost_usage(prgname);
					return -1;
				} else {
					mergeable = !!ret;
					if (ret) {
						vmdq_conf_default.rxmode.jumbo_frame = 1;
						vmdq_conf_default.rxmode.max_rx_pkt_len
							= JUMBO_FRAME_MAX_SIZE;
					}
				}
			}

			/* Enable/disable stats. */
			if (!strncmp(long_option[option_index].name, "stats", MAX_LONG_OPT_SZ)) {
				ret = parse_num_opt(optarg, INT32_MAX);
				if (ret == -1) {
					RTE_LOG(INFO, VHOST_CONFIG,
						"Invalid argument for stats [0..N]\n");
					us_vhost_usage(prgname);
					return -1;
				} else {
					enable_stats = ret;
				}
			}

			/* Set socket file path. */
			if (!strncmp(long_option[option_index].name,
						"socket-file", MAX_LONG_OPT_SZ)) {
				if (us_vhost_parse_socket_path(optarg) == -1) {
					RTE_LOG(INFO, VHOST_CONFIG,
					"Invalid argument for socket name (Max %d characters)\n",
					PATH_MAX);
					us_vhost_usage(prgname);
					return -1;
				}
			}

			break;

			/* Invalid option - print options. */
		default:
			us_vhost_usage(prgname);
			return -1;
		}
	}

	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
		if (enabled_port_mask & (1 << i))
			ports[num_ports++] = i;
	}

	if ((num_ports ==  0) || (num_ports > MAX_SUP_PORTS)) {
		RTE_LOG(INFO, VHOST_PORT, "Current enabled port number is %u,"
			"but only %u port can be enabled\n",num_ports, MAX_SUP_PORTS);
		return -1;
	}

	return 0;
}

/*
 * Update the global var NUM_PORTS and array PORTS according to system ports number
 * and return valid ports number
 */
static unsigned check_ports_num(unsigned nb_ports)
{
	unsigned valid_num_ports = num_ports;
	unsigned portid;

	if (num_ports > nb_ports) {
		RTE_LOG(INFO, VHOST_PORT, "\nSpecified port number(%u) exceeds total system port number(%u)\n",
			num_ports, nb_ports);
		num_ports = nb_ports;
	}

	for (portid = 0; portid < num_ports; portid ++) {
		if (ports[portid] >= nb_ports) {
			RTE_LOG(INFO, VHOST_PORT, "\nSpecified port ID(%u) exceeds max system port ID(%u)\n",
				ports[portid], (nb_ports - 1));
			ports[portid] = INVALID_PORT_ID;
			valid_num_ports--;
		}
	}
	return valid_num_ports;
}

static __rte_always_inline struct vhost_dev *
find_vhost_dev(struct ether_addr *mac)
{
	struct vhost_dev *vdev;

	TAILQ_FOREACH(vdev, &vhost_dev_list, global_vdev_entry) {
		if (vdev->ready == DEVICE_RX &&
		    is_same_ether_addr(mac, &vdev->mac_address))
			return vdev;
	}

	return NULL;
}

/*
 * This function learns the MAC address of the device and registers this along with a
 * vlan tag to a VMDQ.
 */
static int
link_vmdq(struct vhost_dev *vdev, struct rte_mbuf *m)
{
	struct ether_hdr *pkt_hdr;
	int i, ret;

	/* Learn MAC address of guest device from packet */
	pkt_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);

	if (find_vhost_dev(&pkt_hdr->s_addr)) {
		RTE_LOG(ERR, VHOST_DATA,
			"(%d) device is using a registered MAC!\n",
			vdev->vid);
		return -1;
	}

	for (i = 0; i < ETHER_ADDR_LEN; i++)
		vdev->mac_address.addr_bytes[i] = pkt_hdr->s_addr.addr_bytes[i];

	/* vlan_tag currently uses the device_id. */
	vdev->vlan_tag = vlan_tags[vdev->vid];

	/* Print out VMDQ registration info. */
	RTE_LOG(INFO, VHOST_DATA,
		"(%d) mac %02x:%02x:%02x:%02x:%02x:%02x and vlan %d registered\n",
		vdev->vid,
		vdev->mac_address.addr_bytes[0], vdev->mac_address.addr_bytes[1],
		vdev->mac_address.addr_bytes[2], vdev->mac_address.addr_bytes[3],
		vdev->mac_address.addr_bytes[4], vdev->mac_address.addr_bytes[5],
		vdev->vlan_tag);

	/* Register the MAC address. */
	ret = rte_eth_dev_mac_addr_add(ports[0], &vdev->mac_address,
				(uint32_t)vdev->vid + vmdq_pool_base);
	if (ret)
		RTE_LOG(ERR, VHOST_DATA,
			"(%d) failed to add device MAC address to VMDQ\n",
			vdev->vid);

	rte_eth_dev_set_vlan_strip_on_queue(ports[0], vdev->vmdq_rx_q, 1);

	/* Set device as ready for RX. */
	vdev->ready = DEVICE_RX;

	return 0;
}

/*
 * Removes MAC address and vlan tag from VMDQ. Ensures that nothing is adding buffers to the RX
 * queue before disabling RX on the device.
 */
static inline void
unlink_vmdq(struct vhost_dev *vdev)
{
	unsigned i = 0;
	unsigned rx_count;
	struct rte_mbuf *pkts_burst[MAX_PKT_BURST];

	if (vdev->ready == DEVICE_RX) {
		/*clear MAC and VLAN settings*/
		rte_eth_dev_mac_addr_remove(ports[0], &vdev->mac_address);
		for (i = 0; i < 6; i++)
			vdev->mac_address.addr_bytes[i] = 0;

		vdev->vlan_tag = 0;

		/*Clear out the receive buffers*/
		rx_count = rte_eth_rx_burst(ports[0],
					(uint16_t)vdev->vmdq_rx_q, pkts_burst, MAX_PKT_BURST);

		while (rx_count) {
			for (i = 0; i < rx_count; i++)
				rte_pktmbuf_free(pkts_burst[i]);

			rx_count = rte_eth_rx_burst(ports[0],
					(uint16_t)vdev->vmdq_rx_q, pkts_burst, MAX_PKT_BURST);
		}

		vdev->ready = DEVICE_MAC_LEARNING;
	}
}

static __rte_always_inline void
virtio_xmit(struct vhost_dev *dst_vdev, struct vhost_dev *src_vdev,
	    struct rte_mbuf *m)
{
	uint16_t ret;

	if (builtin_net_driver) {
		ret = vs_enqueue_pkts(dst_vdev, VIRTIO_RXQ, &m, 1);
	} else {
		ret = rte_vhost_enqueue_burst(dst_vdev->vid, VIRTIO_RXQ, &m, 1);
	}

	if (enable_stats) {
		rte_atomic64_inc(&dst_vdev->stats.rx_total_atomic);
		rte_atomic64_add(&dst_vdev->stats.rx_atomic, ret);
		src_vdev->stats.tx_total++;
		src_vdev->stats.tx += ret;
	}
}

/*
 * Check if the packet destination MAC address is for a local device. If so then put
 * the packet on that devices RX queue. If not then return.
 */
static __rte_always_inline int
virtio_tx_local(struct vhost_dev *vdev, struct rte_mbuf *m)
{
	struct ether_hdr *pkt_hdr;
	struct vhost_dev *dst_vdev;

	pkt_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);

	dst_vdev = find_vhost_dev(&pkt_hdr->d_addr);
	if (!dst_vdev)
		return -1;

	if (vdev->vid == dst_vdev->vid) {
		RTE_LOG_DP(DEBUG, VHOST_DATA,
			"(%d) TX: src and dst MAC is same. Dropping packet.\n",
			vdev->vid);
		return 0;
	}

	RTE_LOG_DP(DEBUG, VHOST_DATA,
		"(%d) TX: MAC address is local\n", dst_vdev->vid);

	if (unlikely(dst_vdev->remove)) {
		RTE_LOG_DP(DEBUG, VHOST_DATA,
			"(%d) device is marked for removal\n", dst_vdev->vid);
		return 0;
	}

	virtio_xmit(dst_vdev, vdev, m);
	return 0;
}

/*
 * Check if the destination MAC of a packet is one local VM,
 * and get its vlan tag, and offset if it is.
 */
static __rte_always_inline int
find_local_dest(struct vhost_dev *vdev, struct rte_mbuf *m,
	uint32_t *offset, uint16_t *vlan_tag)
{
	struct vhost_dev *dst_vdev;
	struct ether_hdr *pkt_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);

	dst_vdev = find_vhost_dev(&pkt_hdr->d_addr);
	if (!dst_vdev)
		return 0;

	if (vdev->vid == dst_vdev->vid) {
		RTE_LOG_DP(DEBUG, VHOST_DATA,
			"(%d) TX: src and dst MAC is same. Dropping packet.\n",
			vdev->vid);
		return -1;
	}

	/*
	 * HW vlan strip will reduce the packet length
	 * by minus length of vlan tag, so need restore
	 * the packet length by plus it.
	 */
	*offset  = VLAN_HLEN;
	*vlan_tag = vlan_tags[vdev->vid];

	RTE_LOG_DP(DEBUG, VHOST_DATA,
		"(%d) TX: pkt to local VM device id: (%d), vlan tag: %u.\n",
		vdev->vid, dst_vdev->vid, *vlan_tag);

	return 0;
}

static uint16_t
get_psd_sum(void *l3_hdr, uint64_t ol_flags)
{
	if (ol_flags & PKT_TX_IPV4)
		return rte_ipv4_phdr_cksum(l3_hdr, ol_flags);
	else /* assume ethertype == ETHER_TYPE_IPv6 */
		return rte_ipv6_phdr_cksum(l3_hdr, ol_flags);
}

static void virtio_tx_offload(struct rte_mbuf *m)
{
	void *l3_hdr;
	struct ipv4_hdr *ipv4_hdr = NULL;
	struct tcp_hdr *tcp_hdr = NULL;
	struct ether_hdr *eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);

	l3_hdr = (char *)eth_hdr + m->l2_len;

	if (m->ol_flags & PKT_TX_IPV4) {
		ipv4_hdr = l3_hdr;
		ipv4_hdr->hdr_checksum = 0;
		m->ol_flags |= PKT_TX_IP_CKSUM;
	}

	tcp_hdr = (struct tcp_hdr *)((char *)l3_hdr + m->l3_len);
	tcp_hdr->cksum = get_psd_sum(l3_hdr, m->ol_flags);
}

static inline void
free_pkts(struct rte_mbuf **pkts, uint16_t n)
{
	while (n--)
		rte_pktmbuf_free(pkts[n]);
}

static __rte_always_inline void
do_drain_mbuf_table(struct mbuf_table *tx_q)
{
	uint16_t count;

	count = rte_eth_tx_burst(ports[0], tx_q->txq_id,
				 tx_q->m_table, tx_q->len);
	if (unlikely(count < tx_q->len))
		free_pkts(&tx_q->m_table[count], tx_q->len - count);

	tx_q->len = 0;
}

/*
 * This function routes the TX packet to the correct interface. This
 * may be a local device or the physical port.
 */
static __rte_always_inline void
virtio_tx_route(struct vhost_dev *vdev, struct rte_mbuf *m, uint16_t vlan_tag)
{
	struct mbuf_table *tx_q;
	unsigned offset = 0;
	const uint16_t lcore_id = rte_lcore_id();
	struct ether_hdr *nh;


	nh = rte_pktmbuf_mtod(m, struct ether_hdr *);
	if (unlikely(is_broadcast_ether_addr(&nh->d_addr))) {
		struct vhost_dev *vdev2;

		TAILQ_FOREACH(vdev2, &vhost_dev_list, global_vdev_entry) {
			if (vdev2 != vdev)
				virtio_xmit(vdev2, vdev, m);
		}
		goto queue2nic;
	}

	/*check if destination is local VM*/
	if ((vm2vm_mode == VM2VM_SOFTWARE) && (virtio_tx_local(vdev, m) == 0)) {
		rte_pktmbuf_free(m);
		return;
	}

	if (unlikely(vm2vm_mode == VM2VM_HARDWARE)) {
		if (unlikely(find_local_dest(vdev, m, &offset,
					     &vlan_tag) != 0)) {
			rte_pktmbuf_free(m);
			return;
		}
	}

	RTE_LOG_DP(DEBUG, VHOST_DATA,
		"(%d) TX: MAC address is external\n", vdev->vid);

queue2nic:

	/*Add packet to the port tx queue*/
	tx_q = &lcore_tx_queue[lcore_id];

	nh = rte_pktmbuf_mtod(m, struct ether_hdr *);
	if (unlikely(nh->ether_type == rte_cpu_to_be_16(ETHER_TYPE_VLAN))) {
		/* Guest has inserted the vlan tag. */
		struct vlan_hdr *vh = (struct vlan_hdr *) (nh + 1);
		uint16_t vlan_tag_be = rte_cpu_to_be_16(vlan_tag);
		if ((vm2vm_mode == VM2VM_HARDWARE) &&
			(vh->vlan_tci != vlan_tag_be))
			vh->vlan_tci = vlan_tag_be;
	} else {
		m->ol_flags |= PKT_TX_VLAN_PKT;

		/*
		 * Find the right seg to adjust the data len when offset is
		 * bigger than tail room size.
		 */
		if (unlikely(vm2vm_mode == VM2VM_HARDWARE)) {
			if (likely(offset <= rte_pktmbuf_tailroom(m)))
				m->data_len += offset;
			else {
				struct rte_mbuf *seg = m;

				while ((seg->next != NULL) &&
					(offset > rte_pktmbuf_tailroom(seg)))
					seg = seg->next;

				seg->data_len += offset;
			}
			m->pkt_len += offset;
		}

		m->vlan_tci = vlan_tag;
	}

	if (m->ol_flags & PKT_TX_TCP_SEG)
		virtio_tx_offload(m);

	tx_q->m_table[tx_q->len++] = m;
	if (enable_stats) {
		vdev->stats.tx_total++;
		vdev->stats.tx++;
	}

	if (unlikely(tx_q->len == MAX_PKT_BURST))
		do_drain_mbuf_table(tx_q);
}


static __rte_always_inline void
drain_mbuf_table(struct mbuf_table *tx_q)
{
	static uint64_t prev_tsc;
	uint64_t cur_tsc;

	if (tx_q->len == 0)
		return;

	cur_tsc = rte_rdtsc();
	if (unlikely(cur_tsc - prev_tsc > MBUF_TABLE_DRAIN_TSC)) {
		prev_tsc = cur_tsc;

		RTE_LOG_DP(DEBUG, VHOST_DATA,
			"TX queue drained after timeout with burst size %u\n",
			tx_q->len);
		do_drain_mbuf_table(tx_q);
	}
}

static __rte_always_inline void
drain_eth_rx(struct vhost_dev *vdev)
{
	uint16_t rx_count, enqueue_count;
	struct rte_mbuf *pkts[MAX_PKT_BURST];

	rx_count = rte_eth_rx_burst(ports[0], vdev->vmdq_rx_q,
				    pkts, MAX_PKT_BURST);
	if (!rx_count)
		return;

	/*
	 * When "enable_retry" is set, here we wait and retry when there
	 * is no enough free slots in the queue to hold @rx_count packets,
	 * to diminish packet loss.
	 */
	if (enable_retry &&
	    unlikely(rx_count > rte_vhost_avail_entries(vdev->vid,
			VIRTIO_RXQ))) {
		uint32_t retry;

		for (retry = 0; retry < burst_rx_retry_num; retry++) {
			rte_delay_us(burst_rx_delay_time);
			if (rx_count <= rte_vhost_avail_entries(vdev->vid,
					VIRTIO_RXQ))
				break;
		}
	}

	if (builtin_net_driver) {
		enqueue_count = vs_enqueue_pkts(vdev, VIRTIO_RXQ,
						pkts, rx_count);
	} else {
		enqueue_count = rte_vhost_enqueue_burst(vdev->vid, VIRTIO_RXQ,
						pkts, rx_count);
	}
	if (enable_stats) {
		rte_atomic64_add(&vdev->stats.rx_total_atomic, rx_count);
		rte_atomic64_add(&vdev->stats.rx_atomic, enqueue_count);
	}

	free_pkts(pkts, rx_count);
}

static __rte_always_inline void
drain_virtio_tx(struct vhost_dev *vdev)
{
	struct rte_mbuf *pkts[MAX_PKT_BURST];
	uint16_t count;
	uint16_t i;

	if (builtin_net_driver) {
		count = vs_dequeue_pkts(vdev, VIRTIO_TXQ, mbuf_pool,
					pkts, MAX_PKT_BURST);
	} else {
		count = rte_vhost_dequeue_burst(vdev->vid, VIRTIO_TXQ,
					mbuf_pool, pkts, MAX_PKT_BURST);
	}

	/* setup VMDq for the first packet */
	if (unlikely(vdev->ready == DEVICE_MAC_LEARNING) && count) {
		if (vdev->remove || link_vmdq(vdev, pkts[0]) == -1)
			free_pkts(pkts, count);
	}

	for (i = 0; i < count; ++i)
		virtio_tx_route(vdev, pkts[i], vlan_tags[vdev->vid]);
}

/*
 * Main function of vhost-switch. It basically does:
 *
 * for each vhost device {
 *    - drain_eth_rx()
 *
 *      Which drains the host eth Rx queue linked to the vhost device,
 *      and deliver all of them to guest virito Rx ring associated with
 *      this vhost device.
 *
 *    - drain_virtio_tx()
 *
 *      Which drains the guest virtio Tx queue and deliver all of them
 *      to the target, which could be another vhost device, or the
 *      physical eth dev. The route is done in function "virtio_tx_route".
 * }
 */
static int
switch_worker(void *arg __rte_unused)
{
	unsigned i;
	unsigned lcore_id = rte_lcore_id();
	struct vhost_dev *vdev;
	struct mbuf_table *tx_q;

	RTE_LOG(INFO, VHOST_DATA, "Procesing on Core %u started\n", lcore_id);

	tx_q = &lcore_tx_queue[lcore_id];
	for (i = 0; i < rte_lcore_count(); i++) {
		if (lcore_ids[i] == lcore_id) {
			tx_q->txq_id = i;
			break;
		}
	}

	while(1) {
		drain_mbuf_table(tx_q);

		/*
		 * Inform the configuration core that we have exited the
		 * linked list and that no devices are in use if requested.
		 */
		if (lcore_info[lcore_id].dev_removal_flag == REQUEST_DEV_REMOVAL)
			lcore_info[lcore_id].dev_removal_flag = ACK_DEV_REMOVAL;

		/*
		 * Process vhost devices
		 */
		TAILQ_FOREACH(vdev, &lcore_info[lcore_id].vdev_list,
			      lcore_vdev_entry) {
			if (unlikely(vdev->remove)) {
				unlink_vmdq(vdev);
				vdev->ready = DEVICE_SAFE_REMOVE;
				continue;
			}

			if (likely(vdev->ready == DEVICE_RX))
				drain_eth_rx(vdev);

			if (likely(!vdev->remove))
				drain_virtio_tx(vdev);
		}
	}

	return 0;
}

/*
 * Remove a device from the specific data core linked list and from the
 * main linked list. Synchonization  occurs through the use of the
 * lcore dev_removal_flag. Device is made volatile here to avoid re-ordering
 * of dev->remove=1 which can cause an infinite loop in the rte_pause loop.
 */
static void
destroy_device(int vid)
{
	struct vhost_dev *vdev = NULL;
	int lcore;

	TAILQ_FOREACH(vdev, &vhost_dev_list, global_vdev_entry) {
		if (vdev->vid == vid)
			break;
	}
	if (!vdev)
		return;
	/*set the remove flag. */
	vdev->remove = 1;
	while(vdev->ready != DEVICE_SAFE_REMOVE) {
		rte_pause();
	}

	if (builtin_net_driver)
		vs_vhost_net_remove(vdev);

	TAILQ_REMOVE(&lcore_info[vdev->coreid].vdev_list, vdev,
		     lcore_vdev_entry);
	TAILQ_REMOVE(&vhost_dev_list, vdev, global_vdev_entry);


	/* Set the dev_removal_flag on each lcore. */
	RTE_LCORE_FOREACH_SLAVE(lcore)
		lcore_info[lcore].dev_removal_flag = REQUEST_DEV_REMOVAL;

	/*
	 * Once each core has set the dev_removal_flag to ACK_DEV_REMOVAL
	 * we can be sure that they can no longer access the device removed
	 * from the linked lists and that the devices are no longer in use.
	 */
	RTE_LCORE_FOREACH_SLAVE(lcore) {
		while (lcore_info[lcore].dev_removal_flag != ACK_DEV_REMOVAL)
			rte_pause();
	}

	lcore_info[vdev->coreid].device_num--;

	RTE_LOG(INFO, VHOST_DATA,
		"(%d) device has been removed from data core\n",
		vdev->vid);

	rte_free(vdev);
}

/*
 * A new device is added to a data core. First the device is added to the main linked list
 * and the allocated to a specific data core.
 */
static int
new_device(int vid)
{
	int lcore, core_add = 0;
	uint32_t device_num_min = num_devices;
	struct vhost_dev *vdev;

	vdev = rte_zmalloc("vhost device", sizeof(*vdev), RTE_CACHE_LINE_SIZE);
	if (vdev == NULL) {
		RTE_LOG(INFO, VHOST_DATA,
			"(%d) couldn't allocate memory for vhost dev\n",
			vid);
		return -1;
	}
	vdev->vid = vid;

	if (builtin_net_driver)
		vs_vhost_net_setup(vdev);

	TAILQ_INSERT_TAIL(&vhost_dev_list, vdev, global_vdev_entry);
	vdev->vmdq_rx_q = vid * queues_per_pool + vmdq_queue_base;

	/*reset ready flag*/
	vdev->ready = DEVICE_MAC_LEARNING;
	vdev->remove = 0;

	/* Find a suitable lcore to add the device. */
	RTE_LCORE_FOREACH_SLAVE(lcore) {
		if (lcore_info[lcore].device_num < device_num_min) {
			device_num_min = lcore_info[lcore].device_num;
			core_add = lcore;
		}
	}
	vdev->coreid = core_add;

	TAILQ_INSERT_TAIL(&lcore_info[vdev->coreid].vdev_list, vdev,
			  lcore_vdev_entry);
	lcore_info[vdev->coreid].device_num++;

	/* Disable notifications. */
	rte_vhost_enable_guest_notification(vid, VIRTIO_RXQ, 0);
	rte_vhost_enable_guest_notification(vid, VIRTIO_TXQ, 0);

	RTE_LOG(INFO, VHOST_DATA,
		"(%d) device has been added to data core %d\n",
		vid, vdev->coreid);

	return 0;
}

/*
 * These callback allow devices to be added to the data core when configuration
 * has been fully complete.
 */
static const struct vhost_device_ops virtio_net_device_ops =
{
	.new_device =  new_device,
	.destroy_device = destroy_device,
};

/*
 * This is a thread will wake up after a period to print stats if the user has
 * enabled them.
 */
static void
print_stats(void)
{
	struct vhost_dev *vdev;
	uint64_t tx_dropped, rx_dropped;
	uint64_t tx, tx_total, rx, rx_total;
	const char clr[] = { 27, '[', '2', 'J', '\0' };
	const char top_left[] = { 27, '[', '1', ';', '1', 'H','\0' };

	while(1) {
		sleep(enable_stats);

		/* Clear screen and move to top left */
		printf("%s%s\n", clr, top_left);
		printf("Device statistics =================================\n");

		TAILQ_FOREACH(vdev, &vhost_dev_list, global_vdev_entry) {
			tx_total   = vdev->stats.tx_total;
			tx         = vdev->stats.tx;
			tx_dropped = tx_total - tx;

			rx_total   = rte_atomic64_read(&vdev->stats.rx_total_atomic);
			rx         = rte_atomic64_read(&vdev->stats.rx_atomic);
			rx_dropped = rx_total - rx;

			printf("Statistics for device %d\n"
				"-----------------------\n"
				"TX total:              %" PRIu64 "\n"
				"TX dropped:            %" PRIu64 "\n"
				"TX successful:         %" PRIu64 "\n"
				"RX total:              %" PRIu64 "\n"
				"RX dropped:            %" PRIu64 "\n"
				"RX successful:         %" PRIu64 "\n",
				vdev->vid,
				tx_total, tx_dropped, tx,
				rx_total, rx_dropped, rx);
		}

		printf("===================================================\n");
	}
}

static void
unregister_drivers(int socket_num)
{
	int i, ret;

	for (i = 0; i < socket_num; i++) {
		ret = rte_vhost_driver_unregister(socket_files + i * PATH_MAX);
		if (ret != 0)
			RTE_LOG(ERR, VHOST_CONFIG,
				"Fail to unregister vhost driver for %s.\n",
				socket_files + i * PATH_MAX);
	}
}

/* When we receive a INT signal, unregister vhost driver */
static void
sigint_handler(__rte_unused int signum)
{
	/* Unregister vhost driver. */
	unregister_drivers(nb_sockets);

	exit(0);
}

/*
 * While creating an mbuf pool, one key thing is to figure out how
 * many mbuf entries is enough for our use. FYI, here are some
 * guidelines:
 *
 * - Each rx queue would reserve @nr_rx_desc mbufs at queue setup stage
 *
 * - For each switch core (A CPU core does the packet switch), we need
 *   also make some reservation for receiving the packets from virtio
 *   Tx queue. How many is enough depends on the usage. It's normally
 *   a simple calculation like following:
 *
 *       MAX_PKT_BURST * max packet size / mbuf size
 *
 *   So, we definitely need allocate more mbufs when TSO is enabled.
 *
 * - Similarly, for each switching core, we should serve @nr_rx_desc
 *   mbufs for receiving the packets from physical NIC device.
 *
 * - We also need make sure, for each switch core, we have allocated
 *   enough mbufs to fill up the mbuf cache.
 */
static void
create_mbuf_pool(uint16_t nr_port, uint32_t nr_switch_core, uint32_t mbuf_size,
	uint32_t nr_queues, uint32_t nr_rx_desc, uint32_t nr_mbuf_cache)
{
	uint32_t nr_mbufs;
	uint32_t nr_mbufs_per_core;
	uint32_t mtu = 1500;

	if (mergeable)
		mtu = 9000;
	if (enable_tso)
		mtu = 64 * 1024;

	nr_mbufs_per_core  = (mtu + mbuf_size) * MAX_PKT_BURST /
			(mbuf_size - RTE_PKTMBUF_HEADROOM);
	nr_mbufs_per_core += nr_rx_desc;
	nr_mbufs_per_core  = RTE_MAX(nr_mbufs_per_core, nr_mbuf_cache);

	nr_mbufs  = nr_queues * nr_rx_desc;
	nr_mbufs += nr_mbufs_per_core * nr_switch_core;
	nr_mbufs *= nr_port;

	mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL", nr_mbufs,
					    nr_mbuf_cache, 0, mbuf_size,
					    rte_socket_id());
	if (mbuf_pool == NULL)
		rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
}

/*
 * Main function, does initialisation and calls the per-lcore functions.
 */
int
main(int argc, char *argv[])
{
	unsigned lcore_id, core_id = 0;
	unsigned nb_ports, valid_num_ports;
	int ret, i;
	uint16_t portid;
	static pthread_t tid;
	char thread_name[RTE_MAX_THREAD_NAME_LEN];
	uint64_t flags = 0;

	signal(SIGINT, sigint_handler);

	/* init EAL */
	ret = rte_eal_init(argc, argv);
	if (ret < 0)
		rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
	argc -= ret;
	argv += ret;

	/* parse app arguments */
	ret = us_vhost_parse_args(argc, argv);
	if (ret < 0)
		rte_exit(EXIT_FAILURE, "Invalid argument\n");

	for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
		TAILQ_INIT(&lcore_info[lcore_id].vdev_list);

		if (rte_lcore_is_enabled(lcore_id))
			lcore_ids[core_id++] = lcore_id;
	}

	if (rte_lcore_count() > RTE_MAX_LCORE)
		rte_exit(EXIT_FAILURE,"Not enough cores\n");

	/* Get the number of physical ports. */
	nb_ports = rte_eth_dev_count();

	/*
	 * Update the global var NUM_PORTS and global array PORTS
	 * and get value of var VALID_NUM_PORTS according to system ports number
	 */
	valid_num_ports = check_ports_num(nb_ports);

	if ((valid_num_ports ==  0) || (valid_num_ports > MAX_SUP_PORTS)) {
		RTE_LOG(INFO, VHOST_PORT, "Current enabled port number is %u,"
			"but only %u port can be enabled\n",num_ports, MAX_SUP_PORTS);
		return -1;
	}

	/*
	 * FIXME: here we are trying to allocate mbufs big enough for
	 * @MAX_QUEUES, but the truth is we're never going to use that
	 * many queues here. We probably should only do allocation for
	 * those queues we are going to use.
	 */
	create_mbuf_pool(valid_num_ports, rte_lcore_count() - 1, MBUF_DATA_SIZE,
			 MAX_QUEUES, RTE_TEST_RX_DESC_DEFAULT, MBUF_CACHE_SIZE);

	if (vm2vm_mode == VM2VM_HARDWARE) {
		/* Enable VT loop back to let L2 switch to do it. */
		vmdq_conf_default.rx_adv_conf.vmdq_rx_conf.enable_loop_back = 1;
		RTE_LOG(DEBUG, VHOST_CONFIG,
			"Enable loop back for L2 switch in vmdq.\n");
	}

	/* initialize all ports */
	for (portid = 0; portid < nb_ports; portid++) {
		/* skip ports that are not enabled */
		if ((enabled_port_mask & (1 << portid)) == 0) {
			RTE_LOG(INFO, VHOST_PORT,
				"Skipping disabled port %d\n", portid);
			continue;
		}
		if (port_init(portid) != 0)
			rte_exit(EXIT_FAILURE,
				"Cannot initialize network ports\n");
	}

	/* Enable stats if the user option is set. */
	if (enable_stats) {
		ret = pthread_create(&tid, NULL, (void *)print_stats, NULL);
		if (ret != 0)
			rte_exit(EXIT_FAILURE,
				"Cannot create print-stats thread\n");

		/* Set thread_name for aid in debugging.  */
		snprintf(thread_name, RTE_MAX_THREAD_NAME_LEN, "print-stats");
		ret = rte_thread_setname(tid, thread_name);
		if (ret != 0)
			RTE_LOG(DEBUG, VHOST_CONFIG,
				"Cannot set print-stats name\n");
	}

	/* Launch all data cores. */
	RTE_LCORE_FOREACH_SLAVE(lcore_id)
		rte_eal_remote_launch(switch_worker, NULL, lcore_id);

	if (client_mode)
		flags |= RTE_VHOST_USER_CLIENT;

	if (dequeue_zero_copy)
		flags |= RTE_VHOST_USER_DEQUEUE_ZERO_COPY;

	/* Register vhost user driver to handle vhost messages. */
	for (i = 0; i < nb_sockets; i++) {
		char *file = socket_files + i * PATH_MAX;
		ret = rte_vhost_driver_register(file, flags);
		if (ret != 0) {
			unregister_drivers(i);
			rte_exit(EXIT_FAILURE,
				"vhost driver register failure.\n");
		}

		if (builtin_net_driver)
			rte_vhost_driver_set_features(file, VIRTIO_NET_FEATURES);

		if (mergeable == 0) {
			rte_vhost_driver_disable_features(file,
				1ULL << VIRTIO_NET_F_MRG_RXBUF);
		}

		if (enable_tx_csum == 0) {
			rte_vhost_driver_disable_features(file,
				1ULL << VIRTIO_NET_F_CSUM);
		}

		if (enable_tso == 0) {
			rte_vhost_driver_disable_features(file,
				1ULL << VIRTIO_NET_F_HOST_TSO4);
			rte_vhost_driver_disable_features(file,
				1ULL << VIRTIO_NET_F_HOST_TSO6);
			rte_vhost_driver_disable_features(file,
				1ULL << VIRTIO_NET_F_GUEST_TSO4);
			rte_vhost_driver_disable_features(file,
				1ULL << VIRTIO_NET_F_GUEST_TSO6);
		}

		if (promiscuous) {
			rte_vhost_driver_enable_features(file,
				1ULL << VIRTIO_NET_F_CTRL_RX);
		}

		ret = rte_vhost_driver_callback_register(file,
			&virtio_net_device_ops);
		if (ret != 0) {
			rte_exit(EXIT_FAILURE,
				"failed to register vhost driver callbacks.\n");
		}

		if (rte_vhost_driver_start(file) < 0) {
			rte_exit(EXIT_FAILURE,
				"failed to start vhost driver.\n");
		}
	}

	RTE_LCORE_FOREACH_SLAVE(lcore_id)
		rte_eal_wait_lcore(lcore_id);

	return 0;

}