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-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)