tcp_cwnd_reduction
void tcp_cwnd_reduction(struct sock *sk, int newly_acked_sacked, int newly_lost, int flag);
DECLARE_TRACE(tcp_cwnd_reduction,
tcp_cwnd_reduction(sk, acked_sacked, rs->losses, flag);
tcp_cwnd_reduction(sk, 1, tp->lost - lost, 0);
tcp_cwnd_reduction(sk, rs->acked_sacked, rs->losses, flag);