netdev - [PATCH] [PATCH] tcp: Increment of LINUX_MIB_LISTENOVERFLOWS in tcp_v4_conn

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Message-Id: <1359337550-3958-1-git-send-email-niveditasinghvi@gmail.com>
Date:	Sun, 27 Jan 2013 17:45:50 -0800
From:	Nivedita Singhvi <niveditasinghvi@...il.com>
To:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Cc:	Vijay Subramanian <subramanian.vijay@...il.com>,
	Nivedita Singhvi <niv@...ibm.com>
Subject: [PATCH] [PATCH] tcp: Increment of LINUX_MIB_LISTENOVERFLOWS in tcp_v4_conn_request() (updated)

From: Nivedita Singhvi <niv@...ibm.com>

We drop a connection request if the accept backlog is full and there are
sufficient packets in the syn queue to warrant starting drops. Increment the
appropriate counter so this isn't silent, for accurate stats and help in
debugging.

Signed-off-by: Nivedita Singhvi <niv@...ibm.com>
---
 net/ipv4/tcp_ipv4.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index bbbdcc5..49b4f50 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1502,8 +1502,10 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 	 * clogging syn queue with openreqs with exponentially increasing
 	 * timeout.
 	 */
-	if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
+	if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) {
+		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 		goto drop;
+	}
 
 	req = inet_reqsk_alloc(&tcp_request_sock_ops);
 	if (!req)
-- 
1.7.5.4

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