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tcp: make undo_cwnd mandatory for congestion modules

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The undo_cwnd fallback in the stack doubles cwnd based on ssthresh,
which un-does reno halving behaviour.

It seems more appropriate to let congctl algorithms pair .ssthresh
and .undo_cwnd properly. Add a 'tcp_reno_undo_cwnd' function and wire it
up for all congestion algorithms that used to rely on the fallback.

Cc: Eric Dumazet <edumazet@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2016-11-21 14:18:38 +01:00 • committed by David S. Miller
parent 85f7e7508a
commit e97991832a
8 changed files with 19 additions and 6 deletions
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1
net/ipv4/tcp_lp.c
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@ -316,6 +316,7 @@ static void tcp_lp_pkts_acked(struct sock *sk, const struct ack_sample *sample)
static struct tcp_congestion_ops tcp_lp __read_mostly = {
.init = tcp_lp_init,
.ssthresh = tcp_reno_ssthresh,
.undo_cwnd = tcp_reno_undo_cwnd,
.cong_avoid = tcp_lp_cong_avoid,
.pkts_acked = tcp_lp_pkts_acked,