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tcp: consolidate congestion control undo functions

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Most TCP congestion controls are using identical logic to undo
cwnd except BBR. This patch consolidates these similar functions
to the one used currently by Reno and others.

Suggested-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng
2017-08-03 20:38:52 -07:00
committed by David S. Miller
parent 4faf783998
commit f1722a1be1
9 changed files with 9 additions and 103 deletions
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11
net/ipv4/tcp_highspeed.c
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@@ -94,7 +94,6 @@ static const struct hstcp_aimd_val {
struct hstcp {
u32 ai;
u32 loss_cwnd;
};
static void hstcp_init(struct sock *sk)
@@ -153,22 +152,14 @@ static u32 hstcp_ssthresh(struct sock *sk)
const struct tcp_sock *tp = tcp_sk(sk);
struct hstcp *ca = inet_csk_ca(sk);
ca->loss_cwnd = tp->snd_cwnd;
/* Do multiplicative decrease */
return max(tp->snd_cwnd - ((tp->snd_cwnd * hstcp_aimd_vals[ca->ai].md) >> 8), 2U);
}
static u32 hstcp_cwnd_undo(struct sock *sk)
{
const struct hstcp *ca = inet_csk_ca(sk);
return max(tcp_sk(sk)->snd_cwnd, ca->loss_cwnd);
}
static struct tcp_congestion_ops tcp_highspeed __read_mostly = {
.init = hstcp_init,
.ssthresh = hstcp_ssthresh,
.undo_cwnd = hstcp_cwnd_undo,
.undo_cwnd = tcp_reno_undo_cwnd,
.cong_avoid = hstcp_cong_avoid,
.owner = THIS_MODULE,