if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
gre_trace (vm, node, b[0], tun_sw_if_index[0], ip6[0], ip4[0],
is_ipv6);
if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
gre_trace (vm, node, b[0], tun_sw_if_index[0], ip6[0], ip4[0],
is_ipv6);