Function bbr_exit_persist

freebsd/netinet/tcp_stacks/bbr.c:8010–8068

}

static void
bbr_exit_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, int32_t line)
{
	uint32_t idle_time;

	if (bbr->rc_in_persist == 0)
		return;
	idle_time = bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time);
	bbr->rc_in_persist = 0;
	bbr->rc_hit_state_1 = 0;
	bbr->r_ctl.rc_del_time = cts;
	/*
	 * We invalidate the last ack here since we
	 * don't want to transfer forward the time
	 * for our sum's calculations.
	 */
	if (bbr->rc_inp->inp_in_hpts) {
		tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT);
		bbr->rc_timer_first = 0;
		bbr->r_ctl.rc_hpts_flags = 0;
		bbr->r_ctl.rc_last_delay_val = 0;
		bbr->r_ctl.rc_hptsi_agg_delay = 0;
		bbr->r_agg_early_set = 0;
		bbr->r_ctl.rc_agg_early = 0;
	}
	bbr_log_type_pesist(bbr, cts, idle_time, line, 0);
	if (idle_time >= bbr_rtt_probe_time) {
		/*
		 * This qualifies as a RTT_PROBE session since we drop the
		 * data outstanding to nothing and waited more than
		 * bbr_rtt_probe_time.
		 */
		bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_PERSIST, 0);
		bbr->r_ctl.last_in_probertt = bbr->r_ctl.rc_rtt_shrinks = cts;
	}
	tp->t_rxtshift = 0;
	/*
	 * If in probeBW and we have persisted more than an RTT lets do
	 * special handling.
	 */
	/* Force a time based epoch */
	bbr_set_epoch(bbr, cts, __LINE__);
	/*
	 * Setup the lost so we don't count anything against the guy
	 * we have been stuck with during persists.
	 */
	bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost;
	/* Time un-freezes for the state */
	bbr->r_ctl.rc_bbr_state_time = cts;
	if ((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) ||
	    (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT)) {
		/*
		 * If we are going back to probe-bw
		 * or probe_rtt, we may need to possibly
		 * do a fast restart.
		 */
		bbr_restart_after_idle(bbr, cts, idle_time);
	}