video: sh7760fb: SH7760/SH7763 LCDC framebuffer driver

[linux-2.6] / net / ipv4 / tcp_cong.c

diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index 4451750b478c85d421f67779164244afaa8247fd..6a250828b767aef7f037a3cf10d10b1dd74625cb 100644 (file)
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -274,6 +274,25 @@ int tcp_set_congestion_control(struct sock *sk, const char *name)
        return err;
 }
 
+/* RFC2861 Check whether we are limited by application or congestion window
+ * This is the inverse of cwnd check in tcp_tso_should_defer
+ */
+int tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight)
+{
+       const struct tcp_sock *tp = tcp_sk(sk);
+       u32 left;
+
+       if (in_flight >= tp->snd_cwnd)
+               return 1;
+
+       left = tp->snd_cwnd - in_flight;
+       if (sk_can_gso(sk) &&
+           left * sysctl_tcp_tso_win_divisor < tp->snd_cwnd &&
+           left * tp->mss_cache < sk->sk_gso_max_size)
+               return 1;
+       return left <= tcp_max_burst(tp);
+}
+EXPORT_SYMBOL_GPL(tcp_is_cwnd_limited);
 
 /*
  * Slow start is used when congestion window is less than slow start