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 vhost_kernel_tap_set_offload(int fd, uint64_t features)
47 unsigned int offload = 0;
49 if (features & (1ULL << VIRTIO_NET_F_GUEST_CSUM)) {
50 offload |= TUN_F_CSUM;
51 if (features & (1ULL << VIRTIO_NET_F_GUEST_TSO4))
52 offload |= TUN_F_TSO4;
53 if (features & (1ULL << VIRTIO_NET_F_GUEST_TSO6))
54 offload |= TUN_F_TSO6;
55 if (features & ((1ULL << VIRTIO_NET_F_GUEST_TSO4) |
56 (1ULL << VIRTIO_NET_F_GUEST_TSO6)) &&
57 (features & (1ULL << VIRTIO_NET_F_GUEST_ECN)))
58 offload |= TUN_F_TSO_ECN;
59 if (features & (1ULL << VIRTIO_NET_F_GUEST_UFO))
63 /* Check if our kernel supports TUNSETOFFLOAD */
64 if (ioctl(fd, TUNSETOFFLOAD, 0) != 0 && errno == EINVAL) {
65 PMD_DRV_LOG(ERR, "Kernel doesn't support TUNSETOFFLOAD");
69 if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
70 offload &= ~TUN_F_UFO;
71 if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
72 PMD_DRV_LOG(ERR, "TUNSETOFFLOAD ioctl() failed: %s",
82 vhost_kernel_tap_set_queue(int fd, bool attach)
85 .ifr_flags = attach ? IFF_ATTACH_QUEUE : IFF_DETACH_QUEUE,
88 return ioctl(fd, TUNSETQUEUE, &ifr);
92 vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
93 const char *mac, uint64_t features)
95 unsigned int tap_features;
96 char *tap_name = NULL;
103 * 1. verify we can get/set vnet_hdr_len, tap_probe_vnet_hdr_len
104 * 2. get number of memory regions from vhost module parameter
105 * max_mem_regions, supported in newer version linux kernel
107 tapfd = open(PATH_NET_TUN, O_RDWR);
109 PMD_DRV_LOG(ERR, "fail to open %s: %s",
110 PATH_NET_TUN, strerror(errno));
115 memset(&ifr, 0, sizeof(ifr));
116 ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
118 if (ioctl(tapfd, TUNGETFEATURES, &tap_features) == -1) {
119 PMD_DRV_LOG(ERR, "TUNGETFEATURES failed: %s", strerror(errno));
122 if (tap_features & IFF_ONE_QUEUE)
123 ifr.ifr_flags |= IFF_ONE_QUEUE;
125 /* Let tap instead of vhost-net handle vnet header, as the latter does
126 * not support offloading. And in this case, we should not set feature
127 * bit VHOST_NET_F_VIRTIO_NET_HDR.
129 if (tap_features & IFF_VNET_HDR) {
130 ifr.ifr_flags |= IFF_VNET_HDR;
132 PMD_DRV_LOG(ERR, "TAP does not support IFF_VNET_HDR");
137 ifr.ifr_flags |= IFF_MULTI_QUEUE;
140 strncpy(ifr.ifr_name, *p_ifname, IFNAMSIZ - 1);
142 strncpy(ifr.ifr_name, "tap%d", IFNAMSIZ - 1);
143 if (ioctl(tapfd, TUNSETIFF, (void *)&ifr) == -1) {
144 PMD_DRV_LOG(ERR, "TUNSETIFF failed: %s", strerror(errno));
148 tap_name = strdup(ifr.ifr_name);
150 PMD_DRV_LOG(ERR, "strdup ifname failed: %s", strerror(errno));
154 if (fcntl(tapfd, F_SETFL, O_NONBLOCK) < 0) {
155 PMD_DRV_LOG(ERR, "fcntl tapfd failed: %s", strerror(errno));
159 if (ioctl(tapfd, TUNSETVNETHDRSZ, &hdr_size) < 0) {
160 PMD_DRV_LOG(ERR, "TUNSETVNETHDRSZ failed: %s", strerror(errno));
164 if (ioctl(tapfd, TUNSETSNDBUF, &sndbuf) < 0) {
165 PMD_DRV_LOG(ERR, "TUNSETSNDBUF failed: %s", strerror(errno));
169 ret = vhost_kernel_tap_set_offload(tapfd, features);
170 if (ret < 0 && ret != -ENOTSUP)
173 memset(&ifr, 0, sizeof(ifr));
174 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
175 memcpy(ifr.ifr_hwaddr.sa_data, mac, RTE_ETHER_ADDR_LEN);
176 if (ioctl(tapfd, SIOCSIFHWADDR, (void *)&ifr) == -1) {
177 PMD_DRV_LOG(ERR, "SIOCSIFHWADDR failed: %s", strerror(errno));
182 *p_ifname = tap_name;