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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2016 Intel Corporation
*/
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
#include <rte_ether.h>
#include "vhost_kernel_tap.h"
#include "../virtio_logs.h"
#include "../virtio_pci.h"
static int
vhost_kernel_tap_set_offload(int fd, uint64_t features)
{
unsigned int offload = 0;
if (features & (1ULL << VIRTIO_NET_F_GUEST_CSUM)) {
offload |= TUN_F_CSUM;
if (features & (1ULL << VIRTIO_NET_F_GUEST_TSO4))
offload |= TUN_F_TSO4;
if (features & (1ULL << VIRTIO_NET_F_GUEST_TSO6))
offload |= TUN_F_TSO6;
if (features & ((1ULL << VIRTIO_NET_F_GUEST_TSO4) |
(1ULL << VIRTIO_NET_F_GUEST_TSO6)) &&
(features & (1ULL << VIRTIO_NET_F_GUEST_ECN)))
offload |= TUN_F_TSO_ECN;
if (features & (1ULL << VIRTIO_NET_F_GUEST_UFO))
offload |= TUN_F_UFO;
}
if (offload != 0) {
/* Check if our kernel supports TUNSETOFFLOAD */
if (ioctl(fd, TUNSETOFFLOAD, 0) != 0 && errno == EINVAL) {
PMD_DRV_LOG(ERR, "Kernel does't support TUNSETOFFLOAD\n");
return -ENOTSUP;
}
if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
offload &= ~TUN_F_UFO;
if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
PMD_DRV_LOG(ERR, "TUNSETOFFLOAD ioctl() failed: %s\n",
strerror(errno));
return -1;
}
}
}
return 0;
}
int
vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
const char *mac, uint64_t features)
{
unsigned int tap_features;
int sndbuf = INT_MAX;
struct ifreq ifr;
int tapfd;
/* TODO:
* 1. verify we can get/set vnet_hdr_len, tap_probe_vnet_hdr_len
* 2. get number of memory regions from vhost module parameter
* max_mem_regions, supported in newer version linux kernel
*/
tapfd = open(PATH_NET_TUN, O_RDWR);
if (tapfd < 0) {
PMD_DRV_LOG(ERR, "fail to open %s: %s",
PATH_NET_TUN, strerror(errno));
return -1;
}
/* Construct ifr */
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
if (ioctl(tapfd, TUNGETFEATURES, &tap_features) == -1) {
PMD_DRV_LOG(ERR, "TUNGETFEATURES failed: %s", strerror(errno));
goto error;
}
if (tap_features & IFF_ONE_QUEUE)
ifr.ifr_flags |= IFF_ONE_QUEUE;
/* Let tap instead of vhost-net handle vnet header, as the latter does
* not support offloading. And in this case, we should not set feature
* bit VHOST_NET_F_VIRTIO_NET_HDR.
*/
if (tap_features & IFF_VNET_HDR) {
ifr.ifr_flags |= IFF_VNET_HDR;
} else {
PMD_DRV_LOG(ERR, "TAP does not support IFF_VNET_HDR");
goto error;
}
if (req_mq)
ifr.ifr_flags |= IFF_MULTI_QUEUE;
if (*p_ifname)
strncpy(ifr.ifr_name, *p_ifname, IFNAMSIZ - 1);
else
strncpy(ifr.ifr_name, "tap%d", IFNAMSIZ - 1);
if (ioctl(tapfd, TUNSETIFF, (void *)&ifr) == -1) {
PMD_DRV_LOG(ERR, "TUNSETIFF failed: %s", strerror(errno));
goto error;
}
fcntl(tapfd, F_SETFL, O_NONBLOCK);
if (ioctl(tapfd, TUNSETVNETHDRSZ, &hdr_size) < 0) {
PMD_DRV_LOG(ERR, "TUNSETVNETHDRSZ failed: %s", strerror(errno));
goto error;
}
if (ioctl(tapfd, TUNSETSNDBUF, &sndbuf) < 0) {
PMD_DRV_LOG(ERR, "TUNSETSNDBUF failed: %s", strerror(errno));
goto error;
}
vhost_kernel_tap_set_offload(tapfd, features);
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
memcpy(ifr.ifr_hwaddr.sa_data, mac, ETHER_ADDR_LEN);
if (ioctl(tapfd, SIOCSIFHWADDR, (void *)&ifr) == -1) {
PMD_DRV_LOG(ERR, "SIOCSIFHWADDR failed: %s", strerror(errno));
goto error;
}
if (!(*p_ifname))
*p_ifname = strdup(ifr.ifr_name);
return tapfd;
error:
close(tapfd);
return -1;
}
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