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-rw-r--r--include/net/tcp.h14
1 files changed, 13 insertions, 1 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 1b94b9bfe2dc..646dbe3962ea 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -41,6 +41,7 @@
#include <net/ip.h>
#include <net/tcp_states.h>
#include <net/inet_ecn.h>
+#include <net/dst.h>
#include <linux/seq_file.h>
@@ -530,6 +531,17 @@ static inline void tcp_fast_path_check(struct sock *sk)
tcp_fast_path_on(tp);
}
+/* Compute the actual rto_min value */
+static inline u32 tcp_rto_min(struct sock *sk)
+{
+ struct dst_entry *dst = __sk_dst_get(sk);
+ u32 rto_min = TCP_RTO_MIN;
+
+ if (dst && dst_metric_locked(dst, RTAX_RTO_MIN))
+ rto_min = dst_metric_rtt(dst, RTAX_RTO_MIN);
+ return rto_min;
+}
+
/* Compute the actual receive window we are currently advertising.
* Rcv_nxt can be after the window if our peer push more data
* than the offered window.
@@ -895,7 +907,7 @@ static inline int tcp_prequeue(struct sock *sk, struct sk_buff *skb)
wake_up_interruptible(sk->sk_sleep);
if (!inet_csk_ack_scheduled(sk))
inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
- (3 * TCP_RTO_MIN) / 4,
+ (3 * tcp_rto_min(sk)) / 4,
TCP_RTO_MAX);
}
return 1;