[TCP]: Add highest_sack seqno, points to globally highest SACK

It is guaranteed to be valid only when !tp->sacked_out. In most
cases this seqno is available in the last ACK but there is no
guarantee for that. The new fast recovery loss marking algorithm
needs this as entry point.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index c6b9f92e8289..c072f88afb97 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -333,6 +333,8 @@ struct tcp_sock {
 
         struct tcp_sack_block_wire recv_sack_cache[4];
 
+        u32     highest_sack;   /* Start seq of globally highest revd SACK (valid only in slowpath) */
+
         /* from STCP, retrans queue hinting */
         struct sk_buff* lost_skb_hint;