#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.h"
+
+
+int
+tap_support_features(unsigned int *tap_features)
+{
+ int tapfd;
+
+ 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;
+ }
+
+ if (ioctl(tapfd, TUNGETFEATURES, tap_features) == -1) {
+ PMD_DRV_LOG(ERR, "TUNGETFEATURES failed: %s", strerror(errno));
+ close(tapfd);
+ return -1;
+ }
+
+ close(tapfd);
+ return 0;
+}
int
-vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq)
+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;
+ }
+
+ /* Check if our kernel supports TUNSETOFFLOAD */
+ if (ioctl(fd, TUNSETOFFLOAD, 0) != 0 && errno == EINVAL) {
+ PMD_DRV_LOG(ERR, "Kernel doesn'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_tap_set_queue(int fd, bool attach)
+{
+ struct ifreq ifr = {
+ .ifr_flags = attach ? IFF_ATTACH_QUEUE : IFF_DETACH_QUEUE,
+ };
+
+ return ioctl(fd, TUNSETQUEUE, &ifr);
+}
+
+int
+vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
+ const char *mac, uint64_t features)
{
unsigned int tap_features;
+ char *tap_name = NULL;
int sndbuf = INT_MAX;
struct ifreq ifr;
int tapfd;
- unsigned int offload =
- TUN_F_CSUM |
- TUN_F_TSO4 |
- TUN_F_TSO6 |
- TUN_F_TSO_ECN |
- TUN_F_UFO;
+ int ret;
/* TODO:
* 1. verify we can get/set vnet_hdr_len, tap_probe_vnet_hdr_len
goto error;
}
- fcntl(tapfd, F_SETFL, O_NONBLOCK);
+ tap_name = strdup(ifr.ifr_name);
+ if (!tap_name) {
+ PMD_DRV_LOG(ERR, "strdup ifname failed: %s", strerror(errno));
+ goto error;
+ }
+
+ if (fcntl(tapfd, F_SETFL, O_NONBLOCK) < 0) {
+ PMD_DRV_LOG(ERR, "fcntl tapfd failed: %s", strerror(errno));
+ goto error;
+ }
if (ioctl(tapfd, TUNSETVNETHDRSZ, &hdr_size) < 0) {
PMD_DRV_LOG(ERR, "TUNSETVNETHDRSZ failed: %s", strerror(errno));
goto error;
}
- /* TODO: before set the offload capabilities, we'd better (1) check
- * negotiated features to see if necessary to offload; (2) query tap
- * to see if it supports the offload capabilities.
- */
- if (ioctl(tapfd, TUNSETOFFLOAD, offload) != 0)
- PMD_DRV_LOG(ERR, "TUNSETOFFLOAD ioctl() failed: %s",
- strerror(errno));
+ ret = vhost_kernel_tap_set_offload(tapfd, features);
+ if (ret < 0 && ret != -ENOTSUP)
+ goto error;
+
+ memset(&ifr, 0, sizeof(ifr));
+ ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
+ memcpy(ifr.ifr_hwaddr.sa_data, mac, RTE_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);
+ free(*p_ifname);
+ *p_ifname = tap_name;
return tapfd;
error:
+ free(tap_name);
close(tapfd);
return -1;
}