tcp: add OFO snmp counters

Add three SNMP TCP counters, to better track TCP behavior
at global stage (netstat -s), when packets are received
Out Of Order (OFO)

TCPOFOQueue : Number of packets queued in OFO queue

TCPOFODrop  : Number of packets meant to be queued in OFO
              but dropped because socket rcvbuf limit hit.

TCPOFOMerge : Number of packets in OFO that were merged with
              other packets.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/snmp.h b/include/linux/snmp.h
index 2e68f5ba0389..6e4c51123828 100644
--- a/include/linux/snmp.h
+++ b/include/linux/snmp.h
@@ -233,7 +233,10 @@ enum
         LINUX_MIB_TCPREQQFULLDOCOOKIES,         /* TCPReqQFullDoCookies */
         LINUX_MIB_TCPREQQFULLDROP,              /* TCPReqQFullDrop */
         LINUX_MIB_TCPRETRANSFAIL,               /* TCPRetransFail */
-        LINUX_MIB_TCPRCVCOALESCE,                       /* TCPRcvCoalesce */
+        LINUX_MIB_TCPRCVCOALESCE,               /* TCPRcvCoalesce */
+        LINUX_MIB_TCPOFOQUEUE,                  /* TCPOFOQueue */
+        LINUX_MIB_TCPOFODROP,                   /* TCPOFODrop */
+        LINUX_MIB_TCPOFOMERGE,                  /* TCPOFOMerge */
         __LINUX_MIB_MAX
 };