netdev - [PATCH net-next] tcp: Fix bug in ofo queue pruning MIB stats

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Date:	Wed, 21 Dec 2011 15:50:01 -0800
From:	Vijay Subramanian <subramanian.vijay@...il.com>
To:	netdev@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	Vijay Subramanian <subramanian.vijay@...il.com>
Subject: [PATCH net-next] tcp: Fix bug in ofo queue pruning MIB stats

Linux MIB LINUX_MIB_OFOPRUNED is supposed to count the number of packets
dropped from the out-of-order queue due to socket buffer overrun. Instead
of counting the number of skbs freed, it counts the number of calls make to
__skb_queue_purge() which is not what the user (see f.e. netstat) is expecting.
Fix this by  incrementing the counter correctly.

Signed-off-by: Vijay Subramanian <subramanian.vijay@...il.com>
---
 net/ipv4/tcp_input.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2877c3e..0e2c21b 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4833,7 +4833,8 @@ static int tcp_prune_ofo_queue(struct sock *sk)
 	int res = 0;
 
 	if (!skb_queue_empty(&tp->out_of_order_queue)) {
-		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_OFOPRUNED);
+		NET_ADD_STATS_BH(sock_net(sk), LINUX_MIB_OFOPRUNED,
+				 tp->out_of_order_queue.qlen);
 		__skb_queue_purge(&tp->out_of_order_queue);
 
 		/* Reset SACK state.  A conforming SACK implementation will
-- 
1.7.0.4

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