[TCP] MIB: Count FRTO's successfully detected spurious RTOs

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

3 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/snmp.h b/include/linux/snmp.h
index d8fd3ec4148a..89f0c2b5f405 100644
--- a/include/linux/snmp.h
+++ b/include/linux/snmp.h
@@ -213,6 +213,7 @@ enum
         LINUX_MIB_TCPSACKDISCARD,               /* TCPSACKDiscard */
         LINUX_MIB_TCPDSACKIGNOREDOLD,           /* TCPSACKIgnoredOld */
         LINUX_MIB_TCPDSACKIGNOREDNOUNDO,        /* TCPSACKIgnoredNoUndo */
+        LINUX_MIB_TCPSPURIOUSRTOS,              /* TCPSpuriousRTOs */
         __LINUX_MIB_MAX
 };
 
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 2015148b41a8..9dee70e1cf0d 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -245,6 +245,7 @@ static const struct snmp_mib snmp4_net_list[] = {
         SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
         SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
         SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
+        SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
         SNMP_MIB_SENTINEL
 };
 
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4866e75e98e0..4b27739031fb 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2935,6 +2935,7 @@ static int tcp_process_frto(struct sock *sk, int flag)
                 }
                 tp->frto_counter = 0;
                 tp->undo_marker = 0;
+                NET_INC_STATS_BH(LINUX_MIB_TCPSPURIOUSRTOS);
         }
         return 0;
 }