netdev - [RFC PATCH 3/3] [TCP] MIB: Count FRTO's successfully detected spurious RTOs

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Date:	Mon, 24 Sep 2007 12:04:08 +0300
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: [RFC PATCH 3/3] [TCP] MIB: Count FRTO's successfully detected spurious RTOs

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
---
 include/linux/snmp.h |    1 +
 net/ipv4/proc.c      |    1 +
 net/ipv4/tcp_input.c |    1 +
 3 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/include/linux/snmp.h b/include/linux/snmp.h
index d8fd3ec..89f0c2b 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 2015148..9dee70e 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 ae06b94..259f517 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;
 }
-- 
1.5.0.6

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