tcp_hw_highest_rate_ifp
tcp_hw_highest_rate_ifp(struct ifnet *ifp, struct inpcb *inp);
high_rate = tcp_hw_highest_rate_ifp(rack->rc_inp->inp_route.ro_nh->nh_ifp, rack->rc_inp);
high_rate = tcp_hw_highest_rate_ifp(rack->rc_inp->inp_route.ro_nh->nh_ifp, rack->rc_inp);