TUNNEL_ENCAP_FLAG_CSUM
info->encap.flags |= TUNNEL_ENCAP_FLAG_CSUM;
udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb,
int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM :
int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM :