tcp: skip cwnd moderation in TCP_CA_Open in tcp_try_to_open

[linux-2.6.git] / net / ipv4 / tcp_hybla.c

diff --git a/net/ipv4/tcp_hybla.c b/net/ipv4/tcp_hybla.c
index 44618b6..fe3ecf4 100644 (file)
--- a/net/ipv4/tcp_hybla.c
+++ b/net/ipv4/tcp_hybla.c
@@ -101,8 +101,10 @@ static void hybla_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)
        if (!tcp_is_cwnd_limited(sk, in_flight))
                return;
 
-       if (!ca->hybla_en)
-               return tcp_reno_cong_avoid(sk, ack, in_flight);
+       if (!ca->hybla_en) {
+               tcp_reno_cong_avoid(sk, ack, in_flight);
+               return;
+       }
 
        if (ca->rho == 0)
                hybla_recalc_param(sk);
@@ -124,8 +126,8 @@ static void hybla_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)
                 * calculate 2^fract in a <<7 value.
                 */
                is_slowstart = 1;
-               increment = ((1 << ca->rho) * hybla_fraction(rho_fractions))
-                       - 128;
+               increment = ((1 << min(ca->rho, 16U)) *
+                       hybla_fraction(rho_fractions)) - 128;
        } else {
                /*
                 * congestion avoidance
@@ -148,7 +150,11 @@ static void hybla_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)
                ca->snd_cwnd_cents -= 128;
                tp->snd_cwnd_cnt = 0;
        }
-
+       /* check when cwnd has not been incremented for a while */
+       if (increment == 0 && odd == 0 && tp->snd_cwnd_cnt >= tp->snd_cwnd) {
+               tp->snd_cwnd++;
+               tp->snd_cwnd_cnt = 0;
+       }
        /* clamp down slowstart cwnd to ssthresh value. */
        if (is_slowstart)
                tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_ssthresh);
@@ -156,7 +162,7 @@ static void hybla_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)
        tp->snd_cwnd = min_t(u32, tp->snd_cwnd, tp->snd_cwnd_clamp);
 }
 
-static struct tcp_congestion_ops tcp_hybla = {
+static struct tcp_congestion_ops tcp_hybla __read_mostly = {
        .init           = hybla_init,
        .ssthresh       = tcp_reno_ssthresh,
        .min_cwnd       = tcp_reno_min_cwnd,