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authorFlorian Westphal <fw@strlen.de>2016-11-14 16:42:01 +0100
committerDavid S. Miller <davem@davemloft.net>2016-11-15 22:01:58 -0500
commit4780566784b3968ab9fd6cc94bab72421813f004 (patch)
treea740b61075e065ba2d819b8cb83f967de61648de /net/ipv4
parent0fa1dfd6b92b31eed5446e907049d5b0062b8860 (diff)
dctcp: update cwnd on congestion event
draft-ietf-tcpm-dctcp-02 says: ... when the sender receives an indication of congestion (ECE), the sender SHOULD update cwnd as follows: cwnd = cwnd * (1 - DCTCP.Alpha / 2) So, lets do this and reduce cwnd more smoothly (and faster), as per current congestion estimate. Cc: Lawrence Brakmo <brakmo@fb.com> Cc: Andrew Shewmaker <agshew@gmail.com> Cc: Glenn Judd <glenn.judd@morganstanley.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp_dctcp.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/net/ipv4/tcp_dctcp.c b/net/ipv4/tcp_dctcp.c
index ab37c6775630..51139175bf61 100644
--- a/net/ipv4/tcp_dctcp.c
+++ b/net/ipv4/tcp_dctcp.c
@@ -188,8 +188,8 @@ static void dctcp_ce_state_1_to_0(struct sock *sk)
static void dctcp_update_alpha(struct sock *sk, u32 flags)
{
- const struct tcp_sock *tp = tcp_sk(sk);
struct dctcp *ca = inet_csk_ca(sk);
+ struct tcp_sock *tp = tcp_sk(sk);
u32 acked_bytes = tp->snd_una - ca->prior_snd_una;
/* If ack did not advance snd_una, count dupack as MSS size.
@@ -229,6 +229,13 @@ static void dctcp_update_alpha(struct sock *sk, u32 flags)
WRITE_ONCE(ca->dctcp_alpha, alpha);
dctcp_reset(tp, ca);
}
+
+ if (flags & CA_ACK_ECE) {
+ unsigned int cwnd = dctcp_ssthresh(sk);
+
+ if (cwnd != tp->snd_cwnd)
+ tp->snd_cwnd = cwnd;
+ }
}
static void dctcp_state(struct sock *sk, u8 new_state)