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-rw-r--r--include/net/tcp.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 54f212ce8aaf..e5319495f15e 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1252,6 +1252,24 @@ static inline struct sk_buff *tcp_write_queue_prev(struct sock *sk, struct sk_bu
#define tcp_for_write_queue_from_safe(skb, tmp, sk) \
skb_queue_walk_from_safe(&(sk)->sk_write_queue, skb, tmp)
+static inline bool retransmits_timed_out(const struct sock *sk,
+ unsigned int boundary)
+{
+ int limit, K;
+ if (!inet_csk(sk)->icsk_retransmits)
+ return false;
+
+ K = ilog2(TCP_RTO_MAX/TCP_RTO_MIN);
+
+ if (boundary <= K)
+ limit = ((2 << boundary) - 1) * TCP_RTO_MIN;
+ else
+ limit = ((2 << K) - 1) * TCP_RTO_MIN +
+ (boundary - K) * TCP_RTO_MAX;
+
+ return (tcp_time_stamp - tcp_sk(sk)->retrans_stamp) >= limit;
+}
+
static inline struct sk_buff *tcp_send_head(struct sock *sk)
{
return sk->sk_send_head;