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Commit 03fba047 authored by Ilpo Järvinen's avatar Ilpo Järvinen Committed by David S. Miller
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[TCP] Highspeed: Limited slow-start is nowadays in tcp_slow_start



Reuse limited slow-start (RFC3742) included into tcp_cong instead
of having another implementation in High Speed TCP.

Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 72fbaeb6
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+3 −21
Original line number Diff line number Diff line
@@ -97,10 +97,6 @@ struct hstcp {
	u32	ai;
};

static int max_ssthresh = 100;
module_param(max_ssthresh, int, 0644);
MODULE_PARM_DESC(max_ssthresh, "limited slow start threshold (RFC3742)");

static void hstcp_init(struct sock *sk)
{
	struct tcp_sock *tp = tcp_sk(sk);
@@ -122,23 +118,9 @@ static void hstcp_cong_avoid(struct sock *sk, u32 adk, u32 rtt,
	if (!tcp_is_cwnd_limited(sk, in_flight))
		return;

	if (tp->snd_cwnd <= tp->snd_ssthresh) {
		/* RFC3742: limited slow start
		 * the window is increased by 1/K MSS for each arriving ACK,
		 * for K = int(cwnd/(0.5 max_ssthresh))
		 */
		if (max_ssthresh > 0 && tp->snd_cwnd > max_ssthresh) {
			u32 k = max(tp->snd_cwnd / (max_ssthresh >> 1), 1U);
			if (++tp->snd_cwnd_cnt >= k) {
				if (tp->snd_cwnd < tp->snd_cwnd_clamp)
					tp->snd_cwnd++;
				tp->snd_cwnd_cnt = 0;
			}
		} else {
			if (tp->snd_cwnd < tp->snd_cwnd_clamp)
				tp->snd_cwnd++;
		}
	} else {
	if (tp->snd_cwnd <= tp->snd_ssthresh)
		tcp_slow_start(tp);
	else {
		/* Update AIMD parameters.
		 *
		 * We want to guarantee that: