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Diffstat (limited to 'include/net')
-rw-r--r--include/net/tcp.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 96cc3b434e4..15bdbc6bd57 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -810,6 +810,27 @@ static __inline__ __u32 tcp_max_burst(const struct tcp_sock *tp)
return 3;
}
+/* RFC2861 Check whether we are limited by application or congestion window
+ * This is the inverse of cwnd check in tcp_tso_should_defer
+ */
+static inline 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;
+
+ if (!(sk->sk_route_caps & NETIF_F_TSO))
+ return 0;
+
+ left = tp->snd_cwnd - in_flight;
+ if (sysctl_tcp_tso_win_divisor)
+ return left * sysctl_tcp_tso_win_divisor < tp->snd_cwnd;
+ else
+ return left <= tcp_max_burst(tp);
+}
+
static __inline__ void tcp_minshall_update(struct tcp_sock *tp, int mss,
const struct sk_buff *skb)
{