[TCP]: add tcp_slow_start helper

Move all the code that does linear TCP slowstart to one
inline function to ease later patch to add ABC support.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 15bdbc6bd571..54c399886275 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -765,6 +765,16 @@ static inline __u32 tcp_current_ssthresh(const struct sock *sk)
                             (tp->snd_cwnd >> 2)));
 }
 
+/*
+ * Linear increase during slow start
+ */
+static inline void tcp_slow_start(struct tcp_sock *tp)
+{
+        if (tp->snd_cwnd < tp->snd_cwnd_clamp)
+                tp->snd_cwnd++;
+}
+
+
 static inline void tcp_sync_left_out(struct tcp_sock *tp)
 {
         if (tp->rx_opt.sack_ok &&