tcp: skb_mstamp_after helper

a helper to prepare the first main RACK patch.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 4398411..24f4dfd 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -463,6 +463,15 @@ static inline u32 skb_mstamp_us_delta(const struct skb_mstamp *t1,
        return delta_us;
 }
 
+static inline bool skb_mstamp_after(const struct skb_mstamp *t1,
+                                   const struct skb_mstamp *t0)
+{
+       s32 diff = t1->stamp_jiffies - t0->stamp_jiffies;
+
+       if (!diff)
+               diff = t1->stamp_us - t0->stamp_us;
+       return diff > 0;
+}
 
 /** 
  *     struct sk_buff - socket buffer