Merge tag 'driver-core-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git...

[karo-tx-linux.git] / include / net / tcp.h

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 70483296157f87acdf5acd5e96eaa910119ba220..ada65e767b28dfcabb662a7b08f65c6fc04f5b73 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1916,6 +1916,16 @@ extern void tcp_rack_advance(struct tcp_sock *tp, u8 sacked, u32 end_seq,
                             u64 xmit_time);
 extern void tcp_rack_reo_timeout(struct sock *sk);
 
+/* At how many usecs into the future should the RTO fire? */
+static inline s64 tcp_rto_delta_us(const struct sock *sk)
+{
+       const struct sk_buff *skb = tcp_write_queue_head(sk);
+       u32 rto = inet_csk(sk)->icsk_rto;
+       u64 rto_time_stamp_us = skb->skb_mstamp + jiffies_to_usecs(rto);
+
+       return rto_time_stamp_us - tcp_sk(sk)->tcp_mstamp;
+}
+
 /*
  * Save and compile IPv4 options, return a pointer to it
  */