tcp: Limit cwnd growth when deferring for GSO
This fixes inappropriately large cwnd growth on sender-limited flows
when GSO is enabled, limiting cwnd growth to 64k.
Signed-off-by: John Heffner <johnwheffner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index bfb1996..6a25082 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -287,7 +287,8 @@
left = tp->snd_cwnd - in_flight;
if (sk_can_gso(sk) &&
- left * sysctl_tcp_tso_win_divisor < tp->snd_cwnd)
+ 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);
}