tun_flow_find
e = tun_flow_find(head, rxhash);
if (!tun_flow_find(head, rxhash) &&
e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq);
e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], rxhash);