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_pci.h"
22 vhost_kernel_tap_set_offload(int fd, uint64_t features)
24 unsigned int offload = 0;
26 if (features & (1ULL << VIRTIO_NET_F_GUEST_CSUM)) {
27 offload |= TUN_F_CSUM;
28 if (features & (1ULL << VIRTIO_NET_F_GUEST_TSO4))
29 offload |= TUN_F_TSO4;
30 if (features & (1ULL << VIRTIO_NET_F_GUEST_TSO6))
31 offload |= TUN_F_TSO6;
32 if (features & ((1ULL << VIRTIO_NET_F_GUEST_TSO4) |
33 (1ULL << VIRTIO_NET_F_GUEST_TSO6)) &&
34 (features & (1ULL << VIRTIO_NET_F_GUEST_ECN)))
35 offload |= TUN_F_TSO_ECN;
36 if (features & (1ULL << VIRTIO_NET_F_GUEST_UFO))
40 /* Check if our kernel supports TUNSETOFFLOAD */
41 if (ioctl(fd, TUNSETOFFLOAD, 0) != 0 && errno == EINVAL) {
42 PMD_DRV_LOG(ERR, "Kernel doesn't support TUNSETOFFLOAD\n");
46 if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
47 offload &= ~TUN_F_UFO;
48 if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
49 PMD_DRV_LOG(ERR, "TUNSETOFFLOAD ioctl() failed: %s\n",
59 vhost_kernel_tap_set_queue(int fd, bool attach)
62 .ifr_flags = attach ? IFF_ATTACH_QUEUE : IFF_DETACH_QUEUE,
65 return ioctl(fd, TUNSETQUEUE, &ifr);
69 vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
70 const char *mac, uint64_t features)
72 unsigned int tap_features;
73 char *tap_name = NULL;
80 * 1. verify we can get/set vnet_hdr_len, tap_probe_vnet_hdr_len
81 * 2. get number of memory regions from vhost module parameter
82 * max_mem_regions, supported in newer version linux kernel
84 tapfd = open(PATH_NET_TUN, O_RDWR);
86 PMD_DRV_LOG(ERR, "fail to open %s: %s",
87 PATH_NET_TUN, strerror(errno));
92 memset(&ifr, 0, sizeof(ifr));
93 ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
95 if (ioctl(tapfd, TUNGETFEATURES, &tap_features) == -1) {
96 PMD_DRV_LOG(ERR, "TUNGETFEATURES failed: %s", strerror(errno));
99 if (tap_features & IFF_ONE_QUEUE)
100 ifr.ifr_flags |= IFF_ONE_QUEUE;
102 /* Let tap instead of vhost-net handle vnet header, as the latter does
103 * not support offloading. And in this case, we should not set feature
104 * bit VHOST_NET_F_VIRTIO_NET_HDR.
106 if (tap_features & IFF_VNET_HDR) {
107 ifr.ifr_flags |= IFF_VNET_HDR;
109 PMD_DRV_LOG(ERR, "TAP does not support IFF_VNET_HDR");
114 ifr.ifr_flags |= IFF_MULTI_QUEUE;
117 strncpy(ifr.ifr_name, *p_ifname, IFNAMSIZ - 1);
119 strncpy(ifr.ifr_name, "tap%d", IFNAMSIZ - 1);
120 if (ioctl(tapfd, TUNSETIFF, (void *)&ifr) == -1) {
121 PMD_DRV_LOG(ERR, "TUNSETIFF failed: %s", strerror(errno));
125 tap_name = strdup(ifr.ifr_name);
127 PMD_DRV_LOG(ERR, "strdup ifname failed: %s", strerror(errno));
131 if (fcntl(tapfd, F_SETFL, O_NONBLOCK) < 0) {
132 PMD_DRV_LOG(ERR, "fcntl tapfd failed: %s", strerror(errno));
136 if (ioctl(tapfd, TUNSETVNETHDRSZ, &hdr_size) < 0) {
137 PMD_DRV_LOG(ERR, "TUNSETVNETHDRSZ failed: %s", strerror(errno));
141 if (ioctl(tapfd, TUNSETSNDBUF, &sndbuf) < 0) {
142 PMD_DRV_LOG(ERR, "TUNSETSNDBUF failed: %s", strerror(errno));
146 ret = vhost_kernel_tap_set_offload(tapfd, features);
147 if (ret < 0 && ret != -ENOTSUP)
150 memset(&ifr, 0, sizeof(ifr));
151 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
152 memcpy(ifr.ifr_hwaddr.sa_data, mac, RTE_ETHER_ADDR_LEN);
153 if (ioctl(tapfd, SIOCSIFHWADDR, (void *)&ifr) == -1) {
154 PMD_DRV_LOG(ERR, "SIOCSIFHWADDR failed: %s", strerror(errno));
159 *p_ifname = tap_name;