+tap_open(const char *ifname, bool multi_queue)
+{
+ struct ifreq ifr;
+ 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 (fcntl(tapfd, F_SETFL, O_NONBLOCK) < 0) {
+ PMD_DRV_LOG(ERR, "fcntl tapfd failed: %s", strerror(errno));
+ close(tapfd);
+ return -1;
+ }
+
+retry_mono_q:
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
+ ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR;
+ if (multi_queue)
+ ifr.ifr_flags |= IFF_MULTI_QUEUE;
+ if (ioctl(tapfd, TUNSETIFF, (void *)&ifr) == -1) {
+ if (multi_queue) {
+ PMD_DRV_LOG(DEBUG,
+ "TUNSETIFF failed (will retry without IFF_MULTI_QUEUE): %s",
+ strerror(errno));
+ multi_queue = false;
+ goto retry_mono_q;
+ }
+
+ PMD_DRV_LOG(ERR, "TUNSETIFF failed: %s", strerror(errno));
+ close(tapfd);
+ tapfd = -1;
+ }
+ return tapfd;
+}
+
+int
+tap_get_name(int tapfd, char **name)
+{
+ struct ifreq ifr;
+ int ret;
+
+ memset(&ifr, 0, sizeof(ifr));
+ if (ioctl(tapfd, TUNGETIFF, (void *)&ifr) == -1) {
+ PMD_DRV_LOG(ERR, "TUNGETIFF failed: %s", strerror(errno));
+ return -1;
+ }
+ ret = asprintf(name, "%s", ifr.ifr_name);
+ if (ret != -1)
+ ret = 0;
+ return ret;
+}
+
+int
+tap_get_flags(int tapfd, unsigned int *tap_flags)
+{
+ struct ifreq ifr;
+
+ memset(&ifr, 0, sizeof(ifr));
+ if (ioctl(tapfd, TUNGETIFF, (void *)&ifr) == -1) {
+ PMD_DRV_LOG(ERR, "TUNGETIFF failed: %s", strerror(errno));
+ return -1;
+ }
+ *tap_flags = ifr.ifr_flags;
+ return 0;
+}
+
+int
+tap_set_mac(int tapfd, uint8_t *mac)
+{
+ struct ifreq ifr;
+
+ 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));
+ return -1;
+ }
+ return 0;
+}
+
+static int