[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, 4 insertions, 6 deletions

diff --git a/net/ipv4/tcp_bic.c b/net/ipv4/tcp_bic.c
index 5af99b3ef5d7..1d0cd86621b1 100644
--- a/net/ipv4/tcp_bic.c
+++ b/net/ipv4/tcp_bic.c
@@ -220,14 +220,12 @@ static void bictcp_cong_avoid(struct sock *sk, u32 ack,
         if (!tcp_is_cwnd_limited(sk, in_flight))
                 return;
 
-        if (tp->snd_cwnd <= tp->snd_ssthresh) {
-                /* In "safe" area, increase. */
-                if (tp->snd_cwnd < tp->snd_cwnd_clamp)
-                        tp->snd_cwnd++;
-        } else {
+        if (tp->snd_cwnd <= tp->snd_ssthresh)
+                tcp_slow_start(tp);
+        else {
                 bictcp_update(ca, tp->snd_cwnd);
 
-                /* In dangerous area, increase slowly.
+                /* In dangerous area, increase slowly.
                  * In theory this is tp->snd_cwnd += 1 / tp->snd_cwnd
                  */
                 if (tp->snd_cwnd_cnt >= ca->cnt) {