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Date:	Tue, 19 Jun 2007 01:25:58 +0300
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org,
	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Subject: [RFC PATCH tcp-2.6 2/2] [TCP] MIB: Add counter for discarded SACK blocks

From: =?ISO-8859-1?q?Ilpo_J=E4rvinen?= <ilpo.jarvinen@...sinki.fi>

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
---
 include/linux/snmp.h |    1 +
 net/ipv4/proc.c      |    1 +
 net/ipv4/tcp_input.c |    4 +++-
 3 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/include/linux/snmp.h b/include/linux/snmp.h
index 802b3a3..6e64a70 100644
--- a/include/linux/snmp.h
+++ b/include/linux/snmp.h
@@ -231,6 +231,7 @@ enum
 	LINUX_MIB_TCPABORTONLINGER,		/* TCPAbortOnLinger */
 	LINUX_MIB_TCPABORTFAILED,		/* TCPAbortFailed */
 	LINUX_MIB_TCPMEMORYPRESSURES,		/* TCPMemoryPressures */
+	LINUX_MIB_TCPSACKDISCARD,		/* TCPSACKDiscard */
 	__LINUX_MIB_MAX
 };
 
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 3b690cf..d5a8de0 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -244,6 +244,7 @@ static const struct snmp_mib snmp4_net_list[] = {
 	SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 	SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 	SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
+	SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 	SNMP_MIB_SENTINEL
 };
 
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index ebd9739..e26d8ca 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1283,8 +1283,10 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb,
 		/* Discard SACK blocks that are seemingly bad */
 		if (before(start_seq, valid_range_start) ||
 		    after(end_seq, tp->snd_nxt) ||
-		    !before(start_seq, end_seq))
+		    !before(start_seq, end_seq)) {
+			NET_INC_STATS_BH(LINUX_MIB_TCPSACKDISCARD);
 			continue;
+		}
 
 		skb = cached_skb;
 		fack_count = cached_fack_count;
-- 
1.5.0.6

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