void
tcp_save_congestion_state(struct tcpcb *tp)
{
/*
* Record connection's current states so that they could be
* recovered, if this turns out to be a spurious retransmit.
*/
tp->snd_cwnd_prev = tp->snd_cwnd;
tp->snd_wacked_prev = tp->snd_wacked;
tp->snd_ssthresh_prev = tp->snd_ssthresh;
tp->snd_recover_prev = tp->snd_recover;
/*
* State for Eifel response after spurious timeout retransmit
* is detected. We save the current value of snd_max even if
* we are called from fast retransmit code, so if RTO needs
* rebase, it will be rebased using the RTT of segment that
* is not sent during possible congestion.
*/
tp->snd_max_prev = tp->snd_max;
if (IN_FASTRECOVERY(tp))
tp->rxt_flags |= TRXT_F_WASFRECOVERY;
else
tp->rxt_flags &= ~TRXT_F_WASFRECOVERY;
if (tp->t_flags & TF_RCVD_TSTMP) {
/* States for Eifel detection */
tp->t_rexmtTS = ticks;
tp->rxt_flags |= TRXT_F_FIRSTACCACK;
}
#ifdef later
tcp_sack_save_scoreboard(&tp->scb);
#endif
}
void
tcp_save_congestion_state(struct tcpcb *tp)
{
tp->snd_cwnd_prev = tp->snd_cwnd;
tp->snd_wacked_prev = tp->snd_wacked;
tp->snd_ssthresh_prev = tp->snd_ssthresh;
tp->snd_recover_prev = tp->snd_recover;
tp->t_rxtcur_prev = tp->t_rxtcur;
tp->t_srtt_prev = tp->t_srtt +
(tcp_eifel_rtoinc << TCP_RTT_SHIFT);
tp->t_rttvar_prev = tp->t_rttvar;
tp->snd_max_prev = tp->snd_max;
tp->rxt_flags &= ~TRXT_F_REBASERTO;
if (IN_FASTRECOVERY(tp))
tp->rxt_flags |= TRXT_F_WASFRECOVERY;
else
tp->rxt_flags &= ~TRXT_F_WASFRECOVERY;
if (tp->t_flags & TF_RCVD_TSTMP) {
tp->t_rexmtTS = ticks;
tp->rxt_flags |= TRXT_F_FIRSTACCACK;
}
#ifdef later
tcp_sack_save_scoreboard(&tp->scb);
#endif
}
