int tnl_get_mtu(const struct vport *vport);
int tnl_send(struct vport *vport, struct sk_buff *skb);
void tnl_rcv(struct vport *vport, struct sk_buff *skb);
int tnl_get_mtu(const struct vport *vport);
int tnl_send(struct vport *vport, struct sk_buff *skb);
void tnl_rcv(struct vport *vport, struct sk_buff *skb);