1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2016 Intel Corporation
10 #include <net/if_arp.h>
15 #include <rte_ether.h>
17 #include "vhost_kernel_tap.h"
18 #include "../virtio_logs.h"
19 #include "../virtio.h"
23 tap_support_features(unsigned int *tap_features)
27 tapfd = open(PATH_NET_TUN, O_RDWR);
29 PMD_DRV_LOG(ERR, "fail to open %s: %s",
30 PATH_NET_TUN, strerror(errno));
34 if (ioctl(tapfd, TUNGETFEATURES, tap_features) == -1) {
35 PMD_DRV_LOG(ERR, "TUNGETFEATURES failed: %s", strerror(errno));
45 tap_open(const char *ifname, bool multi_queue)
50 tapfd = open(PATH_NET_TUN, O_RDWR);
52 PMD_DRV_LOG(ERR, "fail to open %s: %s", PATH_NET_TUN, strerror(errno));
55 if (fcntl(tapfd, F_SETFL, O_NONBLOCK) < 0) {
56 PMD_DRV_LOG(ERR, "fcntl tapfd failed: %s", strerror(errno));
62 memset(&ifr, 0, sizeof(ifr));
63 strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
64 ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR;
66 ifr.ifr_flags |= IFF_MULTI_QUEUE;
67 if (ioctl(tapfd, TUNSETIFF, (void *)&ifr) == -1) {
70 "TUNSETIFF failed (will retry without IFF_MULTI_QUEUE): %s",
76 PMD_DRV_LOG(ERR, "TUNSETIFF failed: %s", strerror(errno));
84 tap_get_name(int tapfd, char **name)
89 memset(&ifr, 0, sizeof(ifr));
90 if (ioctl(tapfd, TUNGETIFF, (void *)&ifr) == -1) {
91 PMD_DRV_LOG(ERR, "TUNGETIFF failed: %s", strerror(errno));
94 ret = asprintf(name, "%s", ifr.ifr_name);
101 tap_get_flags(int tapfd, unsigned int *tap_flags)
105 memset(&ifr, 0, sizeof(ifr));
106 if (ioctl(tapfd, TUNGETIFF, (void *)&ifr) == -1) {
107 PMD_DRV_LOG(ERR, "TUNGETIFF failed: %s", strerror(errno));
110 *tap_flags = ifr.ifr_flags;
115 tap_set_mac(int tapfd, uint8_t *mac)
119 memset(&ifr, 0, sizeof(ifr));
120 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
121 memcpy(ifr.ifr_hwaddr.sa_data, mac, RTE_ETHER_ADDR_LEN);
122 if (ioctl(tapfd, SIOCSIFHWADDR, (void *)&ifr) == -1) {
123 PMD_DRV_LOG(ERR, "SIOCSIFHWADDR failed: %s", strerror(errno));
130 vhost_kernel_tap_set_offload(int fd, uint64_t features)
132 unsigned int offload = 0;
134 if (features & (1ULL << VIRTIO_NET_F_GUEST_CSUM)) {
135 offload |= TUN_F_CSUM;
136 if (features & (1ULL << VIRTIO_NET_F_GUEST_TSO4))
137 offload |= TUN_F_TSO4;
138 if (features & (1ULL << VIRTIO_NET_F_GUEST_TSO6))
139 offload |= TUN_F_TSO6;
140 if (features & ((1ULL << VIRTIO_NET_F_GUEST_TSO4) |
141 (1ULL << VIRTIO_NET_F_GUEST_TSO6)) &&
142 (features & (1ULL << VIRTIO_NET_F_GUEST_ECN)))
143 offload |= TUN_F_TSO_ECN;
144 if (features & (1ULL << VIRTIO_NET_F_GUEST_UFO))
145 offload |= TUN_F_UFO;
148 /* Check if our kernel supports TUNSETOFFLOAD */
149 if (ioctl(fd, TUNSETOFFLOAD, 0) != 0 && errno == EINVAL) {
150 PMD_DRV_LOG(ERR, "Kernel doesn't support TUNSETOFFLOAD");
154 if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
155 offload &= ~TUN_F_UFO;
156 if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
157 PMD_DRV_LOG(ERR, "TUNSETOFFLOAD ioctl() failed: %s",
167 vhost_kernel_tap_setup(int tapfd, int hdr_size, uint64_t features)
169 int sndbuf = INT_MAX;
173 * 1. verify we can get/set vnet_hdr_len, tap_probe_vnet_hdr_len
174 * 2. get number of memory regions from vhost module parameter
175 * max_mem_regions, supported in newer version linux kernel
177 if (ioctl(tapfd, TUNSETVNETHDRSZ, &hdr_size) < 0) {
178 PMD_DRV_LOG(ERR, "TUNSETVNETHDRSZ failed: %s", strerror(errno));
182 if (ioctl(tapfd, TUNSETSNDBUF, &sndbuf) < 0) {
183 PMD_DRV_LOG(ERR, "TUNSETSNDBUF failed: %s", strerror(errno));
187 ret = vhost_kernel_tap_set_offload(tapfd, features);