#define PATH_NET_TUN "/dev/net/tun"
-int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
+int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
+ int vnet_hdr_required, int mq_required)
{
struct ifreq ifr;
int fd, ret;
int len = sizeof(struct virtio_net_hdr);
+ unsigned int features;
TFR(fd = open(PATH_NET_TUN, O_RDWR));
if (fd < 0) {
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
- if (*vnet_hdr) {
- unsigned int features;
+ if (ioctl(fd, TUNGETFEATURES, &features) == 0 &&
+ features & IFF_ONE_QUEUE) {
+ ifr.ifr_flags |= IFF_ONE_QUEUE;
+ }
+ if (*vnet_hdr) {
if (ioctl(fd, TUNGETFEATURES, &features) == 0 &&
features & IFF_VNET_HDR) {
*vnet_hdr = 1;
ioctl(fd, TUNSETVNETHDRSZ, &len);
}
+ if (mq_required) {
+ if ((ioctl(fd, TUNGETFEATURES, &features) != 0) ||
+ !(features & IFF_MULTI_QUEUE)) {
+ error_report("multiqueue required, but no kernel "
+ "support for IFF_MULTI_QUEUE available");
+ close(fd);
+ return -1;
+ } else {
+ ifr.ifr_flags |= IFF_MULTI_QUEUE;
+ }
+ }
+
if (ifname[0] != '\0')
pstrcpy(ifr.ifr_name, IFNAMSIZ, ifname);
else
if (ioctl(fd, TUNSETVNETHDRSZ, &orig) == -1) {
fprintf(stderr, "TUNGETVNETHDRSZ ioctl() failed: %s. Exiting.\n",
strerror(errno));
- assert(0);
+ abort();
return -errno;
}
return 1;
if (ioctl(fd, TUNSETVNETHDRSZ, &len) == -1) {
fprintf(stderr, "TUNSETVNETHDRSZ ioctl() failed: %s. Exiting.\n",
strerror(errno));
- assert(0);
+ abort();
}
}
}
}
}
+
+/* Enable a specific queue of tap. */
+int tap_fd_enable(int fd)
+{
+ struct ifreq ifr;
+ int ret;
+
+ memset(&ifr, 0, sizeof(ifr));
+
+ ifr.ifr_flags = IFF_ATTACH_QUEUE;
+ ret = ioctl(fd, TUNSETQUEUE, (void *) &ifr);
+
+ if (ret != 0) {
+ error_report("could not enable queue");
+ }
+
+ return ret;
+}
+
+/* Disable a specific queue of tap/ */
+int tap_fd_disable(int fd)
+{
+ struct ifreq ifr;
+ int ret;
+
+ memset(&ifr, 0, sizeof(ifr));
+
+ ifr.ifr_flags = IFF_DETACH_QUEUE;
+ ret = ioctl(fd, TUNSETQUEUE, (void *) &ifr);
+
+ if (ret != 0) {
+ error_report("could not disable queue");
+ }
+
+ return ret;
+}
+
+int tap_fd_get_ifname(int fd, char *ifname)
+{
+ struct ifreq ifr;
+
+ if (ioctl(fd, TUNGETIFF, &ifr) != 0) {
+ error_report("TUNGETIFF ioctl() failed: %s",
+ strerror(errno));
+ return -1;
+ }
+
+ pstrcpy(ifname, sizeof(ifr.ifr_name), ifr.ifr_name);
+ return 0;
+}