DPDK logo

Elixir Cross Referencer

   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
/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2018 6WIND S.A.
 * Copyright 2018 Mellanox Technologies, Ltd
 */

#include <errno.h>
#include <linux/if_link.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <net/if.h>
#include <rdma/rdma_netlink.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdalign.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>

#include <rte_errno.h>
#include <rte_malloc.h>
#include <rte_hypervisor.h>

#include "mlx5.h"
#include "mlx5_utils.h"

/* Size of the buffer to receive kernel messages */
#define MLX5_NL_BUF_SIZE (32 * 1024)
/* Send buffer size for the Netlink socket */
#define MLX5_SEND_BUF_SIZE 32768
/* Receive buffer size for the Netlink socket */
#define MLX5_RECV_BUF_SIZE 32768

/** Parameters of VLAN devices created by driver. */
#define MLX5_VMWA_VLAN_DEVICE_PFX "evmlx"
/*
 * Define NDA_RTA as defined in iproute2 sources.
 *
 * see in iproute2 sources file include/libnetlink.h
 */
#ifndef MLX5_NDA_RTA
#define MLX5_NDA_RTA(r) \
	((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
#endif

/*
 * The following definitions are normally found in rdma/rdma_netlink.h,
 * however they are so recent that most systems do not expose them yet.
 */
#ifndef HAVE_RDMA_NL_NLDEV
#define RDMA_NL_NLDEV 5
#endif
#ifndef HAVE_RDMA_NLDEV_CMD_GET
#define RDMA_NLDEV_CMD_GET 1
#endif
#ifndef HAVE_RDMA_NLDEV_CMD_PORT_GET
#define RDMA_NLDEV_CMD_PORT_GET 5
#endif
#ifndef HAVE_RDMA_NLDEV_ATTR_DEV_INDEX
#define RDMA_NLDEV_ATTR_DEV_INDEX 1
#endif
#ifndef HAVE_RDMA_NLDEV_ATTR_DEV_NAME
#define RDMA_NLDEV_ATTR_DEV_NAME 2
#endif
#ifndef HAVE_RDMA_NLDEV_ATTR_PORT_INDEX
#define RDMA_NLDEV_ATTR_PORT_INDEX 3
#endif
#ifndef HAVE_RDMA_NLDEV_ATTR_NDEV_INDEX
#define RDMA_NLDEV_ATTR_NDEV_INDEX 50
#endif

/* These are normally found in linux/if_link.h. */
#ifndef HAVE_IFLA_NUM_VF
#define IFLA_NUM_VF 21
#endif
#ifndef HAVE_IFLA_EXT_MASK
#define IFLA_EXT_MASK 29
#endif
#ifndef HAVE_IFLA_PHYS_SWITCH_ID
#define IFLA_PHYS_SWITCH_ID 36
#endif
#ifndef HAVE_IFLA_PHYS_PORT_NAME
#define IFLA_PHYS_PORT_NAME 38
#endif

/* Add/remove MAC address through Netlink */
struct mlx5_nl_mac_addr {
	struct rte_ether_addr (*mac)[];
	/**< MAC address handled by the device. */
	int mac_n; /**< Number of addresses in the array. */
};

/** Data structure used by mlx5_nl_cmdget_cb(). */
struct mlx5_nl_ifindex_data {
	const char *name; /**< IB device name (in). */
	uint32_t ibindex; /**< IB device index (out). */
	uint32_t ifindex; /**< Network interface index (out). */
	uint32_t portnum; /**< IB device max port number. */
};

/**
 * Opens a Netlink socket.
 *
 * @param protocol
 *   Netlink protocol (e.g. NETLINK_ROUTE, NETLINK_RDMA).
 *
 * @return
 *   A file descriptor on success, a negative errno value otherwise and
 *   rte_errno is set.
 */
int
mlx5_nl_init(int protocol)
{
	int fd;
	int sndbuf_size = MLX5_SEND_BUF_SIZE;
	int rcvbuf_size = MLX5_RECV_BUF_SIZE;
	struct sockaddr_nl local = {
		.nl_family = AF_NETLINK,
	};
	int ret;

	fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, protocol);
	if (fd == -1) {
		rte_errno = errno;
		return -rte_errno;
	}
	ret = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &sndbuf_size, sizeof(int));
	if (ret == -1) {
		rte_errno = errno;
		goto error;
	}
	ret = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf_size, sizeof(int));
	if (ret == -1) {
		rte_errno = errno;
		goto error;
	}
	ret = bind(fd, (struct sockaddr *)&local, sizeof(local));
	if (ret == -1) {
		rte_errno = errno;
		goto error;
	}
	return fd;
error:
	close(fd);
	return -rte_errno;
}

/**
 * Send a request message to the kernel on the Netlink socket.
 *
 * @param[in] nlsk_fd
 *   Netlink socket file descriptor.
 * @param[in] nh
 *   The Netlink message send to the kernel.
 * @param[in] ssn
 *   Sequence number.
 * @param[in] req
 *   Pointer to the request structure.
 * @param[in] len
 *   Length of the request in bytes.
 *
 * @return
 *   The number of sent bytes on success, a negative errno value otherwise and
 *   rte_errno is set.
 */
static int
mlx5_nl_request(int nlsk_fd, struct nlmsghdr *nh, uint32_t sn, void *req,
		int len)
{
	struct sockaddr_nl sa = {
		.nl_family = AF_NETLINK,
	};
	struct iovec iov[2] = {
		{ .iov_base = nh, .iov_len = sizeof(*nh), },
		{ .iov_base = req, .iov_len = len, },
	};
	struct msghdr msg = {
		.msg_name = &sa,
		.msg_namelen = sizeof(sa),
		.msg_iov = iov,
		.msg_iovlen = 2,
	};
	int send_bytes;

	nh->nlmsg_pid = 0; /* communication with the kernel uses pid 0 */
	nh->nlmsg_seq = sn;
	send_bytes = sendmsg(nlsk_fd, &msg, 0);
	if (send_bytes < 0) {
		rte_errno = errno;
		return -rte_errno;
	}
	return send_bytes;
}

/**
 * Send a message to the kernel on the Netlink socket.
 *
 * @param[in] nlsk_fd
 *   The Netlink socket file descriptor used for communication.
 * @param[in] nh
 *   The Netlink message send to the kernel.
 * @param[in] sn
 *   Sequence number.
 *
 * @return
 *   The number of sent bytes on success, a negative errno value otherwise and
 *   rte_errno is set.
 */
static int
mlx5_nl_send(int nlsk_fd, struct nlmsghdr *nh, uint32_t sn)
{
	struct sockaddr_nl sa = {
		.nl_family = AF_NETLINK,
	};
	struct iovec iov = {
		.iov_base = nh,
		.iov_len = nh->nlmsg_len,
	};
	struct msghdr msg = {
		.msg_name = &sa,
		.msg_namelen = sizeof(sa),
		.msg_iov = &iov,
		.msg_iovlen = 1,
	};
	int send_bytes;

	nh->nlmsg_pid = 0; /* communication with the kernel uses pid 0 */
	nh->nlmsg_seq = sn;
	send_bytes = sendmsg(nlsk_fd, &msg, 0);
	if (send_bytes < 0) {
		rte_errno = errno;
		return -rte_errno;
	}
	return send_bytes;
}

/**
 * Receive a message from the kernel on the Netlink socket, following
 * mlx5_nl_send().
 *
 * @param[in] nlsk_fd
 *   The Netlink socket file descriptor used for communication.
 * @param[in] sn
 *   Sequence number.
 * @param[in] cb
 *   The callback function to call for each Netlink message received.
 * @param[in, out] arg
 *   Custom arguments for the callback.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
static int
mlx5_nl_recv(int nlsk_fd, uint32_t sn, int (*cb)(struct nlmsghdr *, void *arg),
	     void *arg)
{
	struct sockaddr_nl sa;
	char buf[MLX5_RECV_BUF_SIZE];
	struct iovec iov = {
		.iov_base = buf,
		.iov_len = sizeof(buf),
	};
	struct msghdr msg = {
		.msg_name = &sa,
		.msg_namelen = sizeof(sa),
		.msg_iov = &iov,
		/* One message at a time */
		.msg_iovlen = 1,
	};
	int multipart = 0;
	int ret = 0;

	do {
		struct nlmsghdr *nh;
		int recv_bytes = 0;

		do {
			recv_bytes = recvmsg(nlsk_fd, &msg, 0);
			if (recv_bytes == -1) {
				rte_errno = errno;
				return -rte_errno;
			}
			nh = (struct nlmsghdr *)buf;
		} while (nh->nlmsg_seq != sn);
		for (;
		     NLMSG_OK(nh, (unsigned int)recv_bytes);
		     nh = NLMSG_NEXT(nh, recv_bytes)) {
			if (nh->nlmsg_type == NLMSG_ERROR) {
				struct nlmsgerr *err_data = NLMSG_DATA(nh);

				if (err_data->error < 0) {
					rte_errno = -err_data->error;
					return -rte_errno;
				}
				/* Ack message. */
				return 0;
			}
			/* Multi-part msgs and their trailing DONE message. */
			if (nh->nlmsg_flags & NLM_F_MULTI) {
				if (nh->nlmsg_type == NLMSG_DONE)
					return 0;
				multipart = 1;
			}
			if (cb) {
				ret = cb(nh, arg);
				if (ret < 0)
					return ret;
			}
		}
	} while (multipart);
	return ret;
}

/**
 * Parse Netlink message to retrieve the bridge MAC address.
 *
 * @param nh
 *   Pointer to Netlink Message Header.
 * @param arg
 *   PMD data register with this callback.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
static int
mlx5_nl_mac_addr_cb(struct nlmsghdr *nh, void *arg)
{
	struct mlx5_nl_mac_addr *data = arg;
	struct ndmsg *r = NLMSG_DATA(nh);
	struct rtattr *attribute;
	int len;

	len = nh->nlmsg_len - NLMSG_LENGTH(sizeof(*r));
	for (attribute = MLX5_NDA_RTA(r);
	     RTA_OK(attribute, len);
	     attribute = RTA_NEXT(attribute, len)) {
		if (attribute->rta_type == NDA_LLADDR) {
			if (data->mac_n == MLX5_MAX_MAC_ADDRESSES) {
				DRV_LOG(WARNING,
					"not enough room to finalize the"
					" request");
				rte_errno = ENOMEM;
				return -rte_errno;
			}
#ifndef NDEBUG
			char m[18];

			rte_ether_format_addr(m, 18, RTA_DATA(attribute));
			DRV_LOG(DEBUG, "bridge MAC address %s", m);
#endif
			memcpy(&(*data->mac)[data->mac_n++],
			       RTA_DATA(attribute), RTE_ETHER_ADDR_LEN);
		}
	}
	return 0;
}

/**
 * Get bridge MAC addresses.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param mac[out]
 *   Pointer to the array table of MAC addresses to fill.
 *   Its size should be of MLX5_MAX_MAC_ADDRESSES.
 * @param mac_n[out]
 *   Number of entries filled in MAC array.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
static int
mlx5_nl_mac_addr_list(struct rte_eth_dev *dev, struct rte_ether_addr (*mac)[],
		      int *mac_n)
{
	struct mlx5_priv *priv = dev->data->dev_private;
	unsigned int iface_idx = mlx5_ifindex(dev);
	struct {
		struct nlmsghdr	hdr;
		struct ifinfomsg ifm;
	} req = {
		.hdr = {
			.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
			.nlmsg_type = RTM_GETNEIGH,
			.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
		},
		.ifm = {
			.ifi_family = PF_BRIDGE,
			.ifi_index = iface_idx,
		},
	};
	struct mlx5_nl_mac_addr data = {
		.mac = mac,
		.mac_n = 0,
	};
	int fd;
	int ret;
	uint32_t sn = priv->nl_sn++;

	if (priv->nl_socket_route == -1)
		return 0;
	fd = priv->nl_socket_route;
	ret = mlx5_nl_request(fd, &req.hdr, sn, &req.ifm,
			      sizeof(struct ifinfomsg));
	if (ret < 0)
		goto error;
	ret = mlx5_nl_recv(fd, sn, mlx5_nl_mac_addr_cb, &data);
	if (ret < 0)
		goto error;
	*mac_n = data.mac_n;
	return 0;
error:
	DRV_LOG(DEBUG, "port %u cannot retrieve MAC address list %s",
		dev->data->port_id, strerror(rte_errno));
	return -rte_errno;
}

/**
 * Modify the MAC address neighbour table with Netlink.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param mac
 *   MAC address to consider.
 * @param add
 *   1 to add the MAC address, 0 to remove the MAC address.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
static int
mlx5_nl_mac_addr_modify(struct rte_eth_dev *dev, struct rte_ether_addr *mac,
			int add)
{
	struct mlx5_priv *priv = dev->data->dev_private;
	unsigned int iface_idx = mlx5_ifindex(dev);
	struct {
		struct nlmsghdr hdr;
		struct ndmsg ndm;
		struct rtattr rta;
		uint8_t buffer[RTE_ETHER_ADDR_LEN];
	} req = {
		.hdr = {
			.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
			.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE |
				NLM_F_EXCL | NLM_F_ACK,
			.nlmsg_type = add ? RTM_NEWNEIGH : RTM_DELNEIGH,
		},
		.ndm = {
			.ndm_family = PF_BRIDGE,
			.ndm_state = NUD_NOARP | NUD_PERMANENT,
			.ndm_ifindex = iface_idx,
			.ndm_flags = NTF_SELF,
		},
		.rta = {
			.rta_type = NDA_LLADDR,
			.rta_len = RTA_LENGTH(RTE_ETHER_ADDR_LEN),
		},
	};
	int fd;
	int ret;
	uint32_t sn = priv->nl_sn++;

	if (priv->nl_socket_route == -1)
		return 0;
	fd = priv->nl_socket_route;
	memcpy(RTA_DATA(&req.rta), mac, RTE_ETHER_ADDR_LEN);
	req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) +
		RTA_ALIGN(req.rta.rta_len);
	ret = mlx5_nl_send(fd, &req.hdr, sn);
	if (ret < 0)
		goto error;
	ret = mlx5_nl_recv(fd, sn, NULL, NULL);
	if (ret < 0)
		goto error;
	return 0;
error:
	DRV_LOG(DEBUG,
		"port %u cannot %s MAC address %02X:%02X:%02X:%02X:%02X:%02X"
		" %s",
		dev->data->port_id,
		add ? "add" : "remove",
		mac->addr_bytes[0], mac->addr_bytes[1],
		mac->addr_bytes[2], mac->addr_bytes[3],
		mac->addr_bytes[4], mac->addr_bytes[5],
		strerror(rte_errno));
	return -rte_errno;
}

/**
 * Add a MAC address.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param mac
 *   MAC address to register.
 * @param index
 *   MAC address index.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_nl_mac_addr_add(struct rte_eth_dev *dev, struct rte_ether_addr *mac,
		     uint32_t index)
{
	struct mlx5_priv *priv = dev->data->dev_private;
	int ret;

	ret = mlx5_nl_mac_addr_modify(dev, mac, 1);
	if (!ret)
		BITFIELD_SET(priv->mac_own, index);
	if (ret == -EEXIST)
		return 0;
	return ret;
}

/**
 * Remove a MAC address.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param mac
 *   MAC address to remove.
 * @param index
 *   MAC address index.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_nl_mac_addr_remove(struct rte_eth_dev *dev, struct rte_ether_addr *mac,
			uint32_t index)
{
	struct mlx5_priv *priv = dev->data->dev_private;

	BITFIELD_RESET(priv->mac_own, index);
	return mlx5_nl_mac_addr_modify(dev, mac, 0);
}

/**
 * Synchronize Netlink bridge table to the internal table.
 *
 * @param dev
 *   Pointer to Ethernet device.
 */
void
mlx5_nl_mac_addr_sync(struct rte_eth_dev *dev)
{
	struct rte_ether_addr macs[MLX5_MAX_MAC_ADDRESSES];
	int macs_n = 0;
	int i;
	int ret;

	ret = mlx5_nl_mac_addr_list(dev, &macs, &macs_n);
	if (ret)
		return;
	for (i = 0; i != macs_n; ++i) {
		int j;

		/* Verify the address is not in the array yet. */
		for (j = 0; j != MLX5_MAX_MAC_ADDRESSES; ++j)
			if (rte_is_same_ether_addr(&macs[i],
					       &dev->data->mac_addrs[j]))
				break;
		if (j != MLX5_MAX_MAC_ADDRESSES)
			continue;
		/* Find the first entry available. */
		for (j = 0; j != MLX5_MAX_MAC_ADDRESSES; ++j) {
			if (rte_is_zero_ether_addr(&dev->data->mac_addrs[j])) {
				dev->data->mac_addrs[j] = macs[i];
				break;
			}
		}
	}
}

/**
 * Flush all added MAC addresses.
 *
 * @param dev
 *   Pointer to Ethernet device.
 */
void
mlx5_nl_mac_addr_flush(struct rte_eth_dev *dev)
{
	struct mlx5_priv *priv = dev->data->dev_private;
	int i;

	for (i = MLX5_MAX_MAC_ADDRESSES - 1; i >= 0; --i) {
		struct rte_ether_addr *m = &dev->data->mac_addrs[i];

		if (BITFIELD_ISSET(priv->mac_own, i))
			mlx5_nl_mac_addr_remove(dev, m, i);
	}
}

/**
 * Enable promiscuous / all multicast mode through Netlink.
 *
 * @param dev
 *   Pointer to Ethernet device structure.
 * @param flags
 *   IFF_PROMISC for promiscuous, IFF_ALLMULTI for allmulti.
 * @param enable
 *   Nonzero to enable, disable otherwise.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
static int
mlx5_nl_device_flags(struct rte_eth_dev *dev, uint32_t flags, int enable)
{
	struct mlx5_priv *priv = dev->data->dev_private;
	unsigned int iface_idx = mlx5_ifindex(dev);
	struct {
		struct nlmsghdr hdr;
		struct ifinfomsg ifi;
	} req = {
		.hdr = {
			.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
			.nlmsg_type = RTM_NEWLINK,
			.nlmsg_flags = NLM_F_REQUEST,
		},
		.ifi = {
			.ifi_flags = enable ? flags : 0,
			.ifi_change = flags,
			.ifi_index = iface_idx,
		},
	};
	int fd;
	int ret;

	assert(!(flags & ~(IFF_PROMISC | IFF_ALLMULTI)));
	if (priv->nl_socket_route < 0)
		return 0;
	fd = priv->nl_socket_route;
	ret = mlx5_nl_send(fd, &req.hdr, priv->nl_sn++);
	if (ret < 0)
		return ret;
	return 0;
}

/**
 * Enable promiscuous mode through Netlink.
 *
 * @param dev
 *   Pointer to Ethernet device structure.
 * @param enable
 *   Nonzero to enable, disable otherwise.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_nl_promisc(struct rte_eth_dev *dev, int enable)
{
	int ret = mlx5_nl_device_flags(dev, IFF_PROMISC, enable);

	if (ret)
		DRV_LOG(DEBUG,
			"port %u cannot %s promisc mode: Netlink error %s",
			dev->data->port_id, enable ? "enable" : "disable",
			strerror(rte_errno));
	return ret;
}

/**
 * Enable all multicast mode through Netlink.
 *
 * @param dev
 *   Pointer to Ethernet device structure.
 * @param enable
 *   Nonzero to enable, disable otherwise.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_nl_allmulti(struct rte_eth_dev *dev, int enable)
{
	int ret = mlx5_nl_device_flags(dev, IFF_ALLMULTI, enable);

	if (ret)
		DRV_LOG(DEBUG,
			"port %u cannot %s allmulti mode: Netlink error %s",
			dev->data->port_id, enable ? "enable" : "disable",
			strerror(rte_errno));
	return ret;
}

/**
 * Process network interface information from Netlink message.
 *
 * @param nh
 *   Pointer to Netlink message header.
 * @param arg
 *   Opaque data pointer for this callback.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
static int
mlx5_nl_cmdget_cb(struct nlmsghdr *nh, void *arg)
{
	struct mlx5_nl_ifindex_data *data = arg;
	size_t off = NLMSG_HDRLEN;
	uint32_t ibindex = 0;
	uint32_t ifindex = 0;
	uint32_t portnum = 0;
	int found = 0;

	if (nh->nlmsg_type !=
	    RDMA_NL_GET_TYPE(RDMA_NL_NLDEV, RDMA_NLDEV_CMD_GET) &&
	    nh->nlmsg_type !=
	    RDMA_NL_GET_TYPE(RDMA_NL_NLDEV, RDMA_NLDEV_CMD_PORT_GET))
		goto error;
	while (off < nh->nlmsg_len) {
		struct nlattr *na = (void *)((uintptr_t)nh + off);
		void *payload = (void *)((uintptr_t)na + NLA_HDRLEN);

		if (na->nla_len > nh->nlmsg_len - off)
			goto error;
		switch (na->nla_type) {
		case RDMA_NLDEV_ATTR_DEV_INDEX:
			ibindex = *(uint32_t *)payload;
			break;
		case RDMA_NLDEV_ATTR_DEV_NAME:
			if (!strcmp(payload, data->name))
				found = 1;
			break;
		case RDMA_NLDEV_ATTR_NDEV_INDEX:
			ifindex = *(uint32_t *)payload;
			break;
		case RDMA_NLDEV_ATTR_PORT_INDEX:
			portnum = *(uint32_t *)payload;
			break;
		default:
			break;
		}
		off += NLA_ALIGN(na->nla_len);
	}
	if (found) {
		data->ibindex = ibindex;
		data->ifindex = ifindex;
		data->portnum = portnum;
	}
	return 0;
error:
	rte_errno = EINVAL;
	return -rte_errno;
}

/**
 * Get index of network interface associated with some IB device.
 *
 * This is the only somewhat safe method to avoid resorting to heuristics
 * when faced with port representors. Unfortunately it requires at least
 * Linux 4.17.
 *
 * @param nl
 *   Netlink socket of the RDMA kind (NETLINK_RDMA).
 * @param[in] name
 *   IB device name.
 * @param[in] pindex
 *   IB device port index, starting from 1
 * @return
 *   A valid (nonzero) interface index on success, 0 otherwise and rte_errno
 *   is set.
 */
unsigned int
mlx5_nl_ifindex(int nl, const char *name, uint32_t pindex)
{
	uint32_t seq = random();
	struct mlx5_nl_ifindex_data data = {
		.name = name,
		.ibindex = 0, /* Determined during first pass. */
		.ifindex = 0, /* Determined during second pass. */
	};
	union {
		struct nlmsghdr nh;
		uint8_t buf[NLMSG_HDRLEN +
			    NLA_HDRLEN + NLA_ALIGN(sizeof(data.ibindex)) +
			    NLA_HDRLEN + NLA_ALIGN(sizeof(pindex))];
	} req = {
		.nh = {
			.nlmsg_len = NLMSG_LENGTH(0),
			.nlmsg_type = RDMA_NL_GET_TYPE(RDMA_NL_NLDEV,
						       RDMA_NLDEV_CMD_GET),
			.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_DUMP,
		},
	};
	struct nlattr *na;
	int ret;

	ret = mlx5_nl_send(nl, &req.nh, seq);
	if (ret < 0)
		return 0;
	ret = mlx5_nl_recv(nl, seq, mlx5_nl_cmdget_cb, &data);
	if (ret < 0)
		return 0;
	if (!data.ibindex)
		goto error;
	++seq;
	req.nh.nlmsg_type = RDMA_NL_GET_TYPE(RDMA_NL_NLDEV,
					     RDMA_NLDEV_CMD_PORT_GET);
	req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
	req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.buf) - NLMSG_HDRLEN);
	na = (void *)((uintptr_t)req.buf + NLMSG_HDRLEN);
	na->nla_len = NLA_HDRLEN + sizeof(data.ibindex);
	na->nla_type = RDMA_NLDEV_ATTR_DEV_INDEX;
	memcpy((void *)((uintptr_t)na + NLA_HDRLEN),
	       &data.ibindex, sizeof(data.ibindex));
	na = (void *)((uintptr_t)na + NLA_ALIGN(na->nla_len));
	na->nla_len = NLA_HDRLEN + sizeof(pindex);
	na->nla_type = RDMA_NLDEV_ATTR_PORT_INDEX;
	memcpy((void *)((uintptr_t)na + NLA_HDRLEN),
	       &pindex, sizeof(pindex));
	ret = mlx5_nl_send(nl, &req.nh, seq);
	if (ret < 0)
		return 0;
	ret = mlx5_nl_recv(nl, seq, mlx5_nl_cmdget_cb, &data);
	if (ret < 0)
		return 0;
	if (!data.ifindex)
		goto error;
	return data.ifindex;
error:
	rte_errno = ENODEV;
	return 0;
}

/**
 * Get the number of physical ports of given IB device.
 *
 * @param nl
 *   Netlink socket of the RDMA kind (NETLINK_RDMA).
 * @param[in] name
 *   IB device name.
 *
 * @return
 *   A valid (nonzero) number of ports on success, 0 otherwise
 *   and rte_errno is set.
 */
unsigned int
mlx5_nl_portnum(int nl, const char *name)
{
	uint32_t seq = random();
	struct mlx5_nl_ifindex_data data = {
		.name = name,
		.ibindex = 0,
		.ifindex = 0,
		.portnum = 0,
	};
	struct nlmsghdr req = {
		.nlmsg_len = NLMSG_LENGTH(0),
		.nlmsg_type = RDMA_NL_GET_TYPE(RDMA_NL_NLDEV,
					       RDMA_NLDEV_CMD_GET),
		.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_DUMP,
	};
	int ret;

	ret = mlx5_nl_send(nl, &req, seq);
	if (ret < 0)
		return 0;
	ret = mlx5_nl_recv(nl, seq, mlx5_nl_cmdget_cb, &data);
	if (ret < 0)
		return 0;
	if (!data.ibindex) {
		rte_errno = ENODEV;
		return 0;
	}
	if (!data.portnum)
		rte_errno = EINVAL;
	return data.portnum;
}

/**
 * Process switch information from Netlink message.
 *
 * @param nh
 *   Pointer to Netlink message header.
 * @param arg
 *   Opaque data pointer for this callback.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
static int
mlx5_nl_switch_info_cb(struct nlmsghdr *nh, void *arg)
{
	struct mlx5_switch_info info = {
		.master = 0,
		.representor = 0,
		.name_type = MLX5_PHYS_PORT_NAME_TYPE_NOTSET,
		.port_name = 0,
		.switch_id = 0,
	};
	size_t off = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	bool switch_id_set = false;
	bool num_vf_set = false;

	if (nh->nlmsg_type != RTM_NEWLINK)
		goto error;
	while (off < nh->nlmsg_len) {
		struct rtattr *ra = (void *)((uintptr_t)nh + off);
		void *payload = RTA_DATA(ra);
		unsigned int i;

		if (ra->rta_len > nh->nlmsg_len - off)
			goto error;
		switch (ra->rta_type) {
		case IFLA_NUM_VF:
			num_vf_set = true;
			break;
		case IFLA_PHYS_PORT_NAME:
			mlx5_translate_port_name((char *)payload, &info);
			break;
		case IFLA_PHYS_SWITCH_ID:
			info.switch_id = 0;
			for (i = 0; i < RTA_PAYLOAD(ra); ++i) {
				info.switch_id <<= 8;
				info.switch_id |= ((uint8_t *)payload)[i];
			}
			switch_id_set = true;
			break;
		}
		off += RTA_ALIGN(ra->rta_len);
	}
	if (switch_id_set) {
		/* We have some E-Switch configuration. */
		mlx5_nl_check_switch_info(num_vf_set, &info);
	}
	assert(!(info.master && info.representor));
	memcpy(arg, &info, sizeof(info));
	return 0;
error:
	rte_errno = EINVAL;
	return -rte_errno;
}

/**
 * Get switch information associated with network interface.
 *
 * @param nl
 *   Netlink socket of the ROUTE kind (NETLINK_ROUTE).
 * @param ifindex
 *   Network interface index.
 * @param[out] info
 *   Switch information object, populated in case of success.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_nl_switch_info(int nl, unsigned int ifindex, struct mlx5_switch_info *info)
{
	uint32_t seq = random();
	struct {
		struct nlmsghdr nh;
		struct ifinfomsg info;
		struct rtattr rta;
		uint32_t extmask;
	} req = {
		.nh = {
			.nlmsg_len = NLMSG_LENGTH
					(sizeof(req.info) +
					 RTA_LENGTH(sizeof(uint32_t))),
			.nlmsg_type = RTM_GETLINK,
			.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK,
		},
		.info = {
			.ifi_family = AF_UNSPEC,
			.ifi_index = ifindex,
		},
		.rta = {
			.rta_type = IFLA_EXT_MASK,
			.rta_len = RTA_LENGTH(sizeof(int32_t)),
		},
		.extmask = RTE_LE32(1),
	};
	int ret;

	ret = mlx5_nl_send(nl, &req.nh, seq);
	if (ret >= 0)
		ret = mlx5_nl_recv(nl, seq, mlx5_nl_switch_info_cb, info);
	if (info->master && info->representor) {
		DRV_LOG(ERR, "ifindex %u device is recognized as master"
			     " and as representor", ifindex);
		rte_errno = ENODEV;
		ret = -rte_errno;
	}
	return ret;
}

/*
 * Delete VLAN network device by ifindex.
 *
 * @param[in] tcf
 *   Context object initialized by mlx5_vlan_vmwa_init().
 * @param[in] ifindex
 *   Interface index of network device to delete.
 */
static void
mlx5_vlan_vmwa_delete(struct mlx5_vlan_vmwa_context *vmwa,
		      uint32_t ifindex)
{
	int ret;
	struct {
		struct nlmsghdr nh;
		struct ifinfomsg info;
	} req = {
		.nh = {
			.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
			.nlmsg_type = RTM_DELLINK,
			.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK,
		},
		.info = {
			.ifi_family = AF_UNSPEC,
			.ifi_index = ifindex,
		},
	};

	if (ifindex) {
		++vmwa->nl_sn;
		if (!vmwa->nl_sn)
			++vmwa->nl_sn;
		ret = mlx5_nl_send(vmwa->nl_socket, &req.nh, vmwa->nl_sn);
		if (ret >= 0)
			ret = mlx5_nl_recv(vmwa->nl_socket,
					   vmwa->nl_sn,
					   NULL, NULL);
		if (ret < 0)
			DRV_LOG(WARNING, "netlink: error deleting"
					 " VLAN WA ifindex %u, %d",
					 ifindex, ret);
	}
}

/* Set of subroutines to build Netlink message. */
static struct nlattr *
nl_msg_tail(struct nlmsghdr *nlh)
{
	return (struct nlattr *)
		(((uint8_t *)nlh) + NLMSG_ALIGN(nlh->nlmsg_len));
}

static void
nl_attr_put(struct nlmsghdr *nlh, int type, const void *data, int alen)
{
	struct nlattr *nla = nl_msg_tail(nlh);

	nla->nla_type = type;
	nla->nla_len = NLMSG_ALIGN(sizeof(struct nlattr) + alen);
	nlh->nlmsg_len = NLMSG_ALIGN(nlh->nlmsg_len) + nla->nla_len;

	if (alen)
		memcpy((uint8_t *)nla + sizeof(struct nlattr), data, alen);
}

static struct nlattr *
nl_attr_nest_start(struct nlmsghdr *nlh, int type)
{
	struct nlattr *nest = (struct nlattr *)nl_msg_tail(nlh);

	nl_attr_put(nlh, type, NULL, 0);
	return nest;
}

static void
nl_attr_nest_end(struct nlmsghdr *nlh, struct nlattr *nest)
{
	nest->nla_len = (uint8_t *)nl_msg_tail(nlh) - (uint8_t *)nest;
}

/*
 * Create network VLAN device with specified VLAN tag.
 *
 * @param[in] tcf
 *   Context object initialized by mlx5_vlan_vmwa_init().
 * @param[in] ifindex
 *   Base network interface index.
 * @param[in] tag
 *   VLAN tag for VLAN network device to create.
 */
static uint32_t
mlx5_vlan_vmwa_create(struct mlx5_vlan_vmwa_context *vmwa,
		      uint32_t ifindex,
		      uint16_t tag)
{
	struct nlmsghdr *nlh;
	struct ifinfomsg *ifm;
	char name[sizeof(MLX5_VMWA_VLAN_DEVICE_PFX) + 32];

	alignas(RTE_CACHE_LINE_SIZE)
	uint8_t buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
		    NLMSG_ALIGN(sizeof(struct ifinfomsg)) +
		    NLMSG_ALIGN(sizeof(struct nlattr)) * 8 +
		    NLMSG_ALIGN(sizeof(uint32_t)) +
		    NLMSG_ALIGN(sizeof(name)) +
		    NLMSG_ALIGN(sizeof("vlan")) +
		    NLMSG_ALIGN(sizeof(uint32_t)) +
		    NLMSG_ALIGN(sizeof(uint16_t)) + 16];
	struct nlattr *na_info;
	struct nlattr *na_vlan;
	int ret;

	memset(buf, 0, sizeof(buf));
	++vmwa->nl_sn;
	if (!vmwa->nl_sn)
		++vmwa->nl_sn;
	nlh = (struct nlmsghdr *)buf;
	nlh->nlmsg_len = sizeof(struct nlmsghdr);
	nlh->nlmsg_type = RTM_NEWLINK;
	nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE |
			   NLM_F_EXCL | NLM_F_ACK;
	ifm = (struct ifinfomsg *)nl_msg_tail(nlh);
	nlh->nlmsg_len += sizeof(struct ifinfomsg);
	ifm->ifi_family = AF_UNSPEC;
	ifm->ifi_type = 0;
	ifm->ifi_index = 0;
	ifm->ifi_flags = IFF_UP;
	ifm->ifi_change = 0xffffffff;
	nl_attr_put(nlh, IFLA_LINK, &ifindex, sizeof(ifindex));
	ret = snprintf(name, sizeof(name), "%s.%u.%u",
		       MLX5_VMWA_VLAN_DEVICE_PFX, ifindex, tag);
	nl_attr_put(nlh, IFLA_IFNAME, name, ret + 1);
	na_info = nl_attr_nest_start(nlh, IFLA_LINKINFO);
	nl_attr_put(nlh, IFLA_INFO_KIND, "vlan", sizeof("vlan"));
	na_vlan = nl_attr_nest_start(nlh, IFLA_INFO_DATA);
	nl_attr_put(nlh, IFLA_VLAN_ID, &tag, sizeof(tag));
	nl_attr_nest_end(nlh, na_vlan);
	nl_attr_nest_end(nlh, na_info);
	assert(sizeof(buf) >= nlh->nlmsg_len);
	ret = mlx5_nl_send(vmwa->nl_socket, nlh, vmwa->nl_sn);
	if (ret >= 0)
		ret = mlx5_nl_recv(vmwa->nl_socket, vmwa->nl_sn, NULL, NULL);
	if (ret < 0) {
		DRV_LOG(WARNING,
			"netlink: VLAN %s create failure (%d)",
			name, ret);
	}
	// Try to get ifindex of created or pre-existing device.
	ret = if_nametoindex(name);
	if (!ret) {
		DRV_LOG(WARNING,
			"VLAN %s failed to get index (%d)",
			name, errno);
		return 0;
	}
	return ret;
}

/*
 * Release VLAN network device, created for VM workaround.
 *
 * @param[in] dev
 *   Ethernet device object, Netlink context provider.
 * @param[in] vlan
 *   Object representing the network device to release.
 */
void mlx5_vlan_vmwa_release(struct rte_eth_dev *dev,
			    struct mlx5_vf_vlan *vlan)
{
	struct mlx5_priv *priv = dev->data->dev_private;
	struct mlx5_vlan_vmwa_context *vmwa = priv->vmwa_context;
	struct mlx5_vlan_dev *vlan_dev = &vmwa->vlan_dev[0];

	assert(vlan->created);
	assert(priv->vmwa_context);
	if (!vlan->created || !vmwa)
		return;
	vlan->created = 0;
	assert(vlan_dev[vlan->tag].refcnt);
	if (--vlan_dev[vlan->tag].refcnt == 0 &&
	    vlan_dev[vlan->tag].ifindex) {
		mlx5_vlan_vmwa_delete(vmwa, vlan_dev[vlan->tag].ifindex);
		vlan_dev[vlan->tag].ifindex = 0;
	}
}

/**
 * Acquire VLAN interface with specified tag for VM workaround.
 *
 * @param[in] dev
 *   Ethernet device object, Netlink context provider.
 * @param[in] vlan
 *   Object representing the network device to acquire.
 */
void mlx5_vlan_vmwa_acquire(struct rte_eth_dev *dev,
			    struct mlx5_vf_vlan *vlan)
{
	struct mlx5_priv *priv = dev->data->dev_private;
	struct mlx5_vlan_vmwa_context *vmwa = priv->vmwa_context;
	struct mlx5_vlan_dev *vlan_dev = &vmwa->vlan_dev[0];

	assert(!vlan->created);
	assert(priv->vmwa_context);
	if (vlan->created || !vmwa)
		return;
	if (vlan_dev[vlan->tag].refcnt == 0) {
		assert(!vlan_dev[vlan->tag].ifindex);
		vlan_dev[vlan->tag].ifindex =
			mlx5_vlan_vmwa_create(vmwa,
					      vmwa->vf_ifindex,
					      vlan->tag);
	}
	if (vlan_dev[vlan->tag].ifindex) {
		vlan_dev[vlan->tag].refcnt++;
		vlan->created = 1;
	}
}

/*
 * Create per ethernet device VLAN VM workaround context
 */
struct mlx5_vlan_vmwa_context *
mlx5_vlan_vmwa_init(struct rte_eth_dev *dev,
		    uint32_t ifindex)
{
	struct mlx5_priv *priv = dev->data->dev_private;
	struct mlx5_dev_config *config = &priv->config;
	struct mlx5_vlan_vmwa_context *vmwa;
	enum rte_hypervisor hv_type;

	/* Do not engage workaround over PF. */
	if (!config->vf)
		return NULL;
	/* Check whether there is desired virtual environment */
	hv_type = rte_hypervisor_get();
	switch (hv_type) {
	case RTE_HYPERVISOR_UNKNOWN:
	case RTE_HYPERVISOR_VMWARE:
		/*
		 * The "white list" of configurations
		 * to engage the workaround.
		 */
		break;
	default:
		/*
		 * The configuration is not found in the "white list".
		 * We should not engage the VLAN workaround.
		 */
		return NULL;
	}
	vmwa = rte_zmalloc(__func__, sizeof(*vmwa), sizeof(uint32_t));
	if (!vmwa) {
		DRV_LOG(WARNING,
			"Can not allocate memory"
			" for VLAN workaround context");
		return NULL;
	}
	vmwa->nl_socket = mlx5_nl_init(NETLINK_ROUTE);
	if (vmwa->nl_socket < 0) {
		DRV_LOG(WARNING,
			"Can not create Netlink socket"
			" for VLAN workaround context");
		rte_free(vmwa);
		return NULL;
	}
	vmwa->nl_sn = random();
	vmwa->vf_ifindex = ifindex;
	vmwa->dev = dev;
	/* Cleanup for existing VLAN devices. */
	return vmwa;
}

/*
 * Destroy per ethernet device VLAN VM workaround context
 */
void mlx5_vlan_vmwa_exit(struct mlx5_vlan_vmwa_context *vmwa)
{
	unsigned int i;

	/* Delete all remaining VLAN devices. */
	for (i = 0; i < RTE_DIM(vmwa->vlan_dev); i++) {
		if (vmwa->vlan_dev[i].ifindex)
			mlx5_vlan_vmwa_delete(vmwa, vmwa->vlan_dev[i].ifindex);
	}
	if (vmwa->nl_socket >= 0)
		close(vmwa->nl_socket);
	rte_free(vmwa);
}