Differential D8225 Diff 21662 head/sys/netinet/tcp_input.c

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head/sys/netinet/tcp_input.c

Show First 20 Lines • Show All 432 Lines • ▼ Show 20 Lines	if (!IN_CONGRECOVERY(tp->t_flags)) {
tp->t_flags \|= TF_ECN_SND_CWR;		tp->t_flags \|= TF_ECN_SND_CWR;
}		}
break;		break;
case CC_RTO:		case CC_RTO:
maxseg = tcp_maxseg(tp);		maxseg = tcp_maxseg(tp);
tp->t_dupacks = 0;		tp->t_dupacks = 0;
tp->t_bytes_acked = 0;		tp->t_bytes_acked = 0;
EXIT_RECOVERY(tp->t_flags);		EXIT_RECOVERY(tp->t_flags);
tp->snd_ssthresh = max(2, min(tp->snd_wnd, tp->snd_cwnd) / 2 /		if (CC_ALGO(tp)->cong_signal == NULL) {
maxseg) * maxseg;		/*
		* RFC5681 Section 3.1
		* ssthresh = max (FlightSize / 2, 2*SMSS) eq (4)
		*/
		tp->snd_ssthresh =
		max((tp->snd_max - tp->snd_una) / 2, 2 * maxseg);
tp->snd_cwnd = maxseg;		tp->snd_cwnd = maxseg;
		}
break;		break;
case CC_RTO_ERR:		case CC_RTO_ERR:
TCPSTAT_INC(tcps_sndrexmitbad);		TCPSTAT_INC(tcps_sndrexmitbad);
/* RTO was unnecessary, so reset everything. */		/* RTO was unnecessary, so reset everything. */
tp->snd_cwnd = tp->snd_cwnd_prev;		tp->snd_cwnd = tp->snd_cwnd_prev;
tp->snd_ssthresh = tp->snd_ssthresh_prev;		tp->snd_ssthresh = tp->snd_ssthresh_prev;
tp->snd_recover = tp->snd_recover_prev;		tp->snd_recover = tp->snd_recover_prev;
if (tp->t_flags & TF_WASFRECOVERY)		if (tp->t_flags & TF_WASFRECOVERY)
▲ Show 20 Lines • Show All 2,156 Lines • ▼ Show 20 Lines	if (SEQ_LEQ(th->th_ack, tp->snd_una)) {
if (V_tcp_do_rfc6675_pipe)		if (V_tcp_do_rfc6675_pipe)
awnd = tcp_compute_pipe(tp);		awnd = tcp_compute_pipe(tp);
else		else
awnd = (tp->snd_nxt - tp->snd_fack) +		awnd = (tp->snd_nxt - tp->snd_fack) +
tp->sackhint.sack_bytes_rexmit;		tp->sackhint.sack_bytes_rexmit;

if (awnd < tp->snd_ssthresh) {		if (awnd < tp->snd_ssthresh) {
tp->snd_cwnd += maxseg;		tp->snd_cwnd += maxseg;
		/*
		* RFC5681 Section 3.2 talks about cwnd
		* inflation on additional dupacks and
		* deflation on recovering from loss.
		*
		* We keep cwnd into check so that
		* we don't have to 'deflate' it when we
		* get out of recovery.
		*/
if (tp->snd_cwnd > tp->snd_ssthresh)		if (tp->snd_cwnd > tp->snd_ssthresh)
tp->snd_cwnd = tp->snd_ssthresh;		tp->snd_cwnd = tp->snd_ssthresh;
}		}
} else		} else
tp->snd_cwnd += maxseg;		tp->snd_cwnd += maxseg;
(void) tp->t_fb->tfb_tcp_output(tp);		(void) tp->t_fb->tfb_tcp_output(tp);
goto drop;		goto drop;
} else if (tp->t_dupacks == tcprexmtthresh) {		} else if (tp->t_dupacks == tcprexmtthresh) {
Show All 23 Lines	if (SEQ_LEQ(th->th_ack, tp->snd_una)) {
cc_ack_received(tp, th, nsegs,		cc_ack_received(tp, th, nsegs,
CC_DUPACK);		CC_DUPACK);
tcp_timer_activate(tp, TT_REXMT, 0);		tcp_timer_activate(tp, TT_REXMT, 0);
tp->t_rtttime = 0;		tp->t_rtttime = 0;
if (tp->t_flags & TF_SACK_PERMIT) {		if (tp->t_flags & TF_SACK_PERMIT) {
TCPSTAT_INC(		TCPSTAT_INC(
tcps_sack_recovery_episode);		tcps_sack_recovery_episode);
tp->sack_newdata = tp->snd_nxt;		tp->sack_newdata = tp->snd_nxt;
		if (CC_ALGO(tp)->cong_signal == NULL)
tp->snd_cwnd = maxseg;		tp->snd_cwnd = maxseg;
(void) tp->t_fb->tfb_tcp_output(tp);		(void) tp->t_fb->tfb_tcp_output(tp);
goto drop;		goto drop;
}		}
tp->snd_nxt = th->th_ack;		tp->snd_nxt = th->th_ack;
		if (CC_ALGO(tp)->cong_signal == NULL)
tp->snd_cwnd = maxseg;		tp->snd_cwnd = maxseg;
(void) tp->t_fb->tfb_tcp_output(tp);		(void) tp->t_fb->tfb_tcp_output(tp);
KASSERT(tp->snd_limited <= 2,		KASSERT(tp->snd_limited <= 2,
("%s: tp->snd_limited too big",		("%s: tp->snd_limited too big",
__func__));		__func__));
		if (CC_ALGO(tp)->cong_signal == NULL)
tp->snd_cwnd = tp->snd_ssthresh +		tp->snd_cwnd = tp->snd_ssthresh +
maxseg *		maxseg *
(tp->t_dupacks - tp->snd_limited);		(tp->t_dupacks - tp->snd_limited);
if (SEQ_GT(onxt, tp->snd_nxt))		if (SEQ_GT(onxt, tp->snd_nxt))
tp->snd_nxt = onxt;		tp->snd_nxt = onxt;
goto drop;		goto drop;
} else if (V_tcp_do_rfc3042) {		} else if (V_tcp_do_rfc3042) {
/*		/*
* Process first and second duplicate		* Process first and second duplicate
* ACKs. Each indicates a segment		* ACKs. Each indicates a segment
* leaving the network, creating room		* leaving the network, creating room
▲ Show 20 Lines • Show All 1,225 Lines • Show Last 20 Lines