netdev - [RFC PATCH net-next] arp: Do not perturb drop profiles with ignored ARP packets

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Message-Id: <20140925175528.8DFF329004BA@tardy>
Date:	Thu, 25 Sep 2014 10:55:28 -0700 (PDT)
From:	raj@...dy.usa.hp.com (Rick Jones)
To:	<netdev@...r.kernel.org>
Cc:	<davem@...emloft.net>
Subject: [RFC PATCH net-next] arp: Do not perturb drop profiles with ignored ARP packets


From: Rick Jones <rick.jones2@...com>

We do not wish to disturb dropwatch or perf drop profiles with an ARP
we will ignore.

Signed-off-by: Rick Jones <rick.jones2@...com>

---

Compile tested only after seeing arp_rcv in a perf top -G -e skb:kfree_skb

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 1a9b99e..16acb59 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -953,10 +953,11 @@ static int arp_rcv(struct sk_buff *skb, struct net_device *dev,
 {
 	const struct arphdr *arp;
 
+	/* do not tweak dropwatch on an ARP we will ignore */
 	if (dev->flags & IFF_NOARP ||
 	    skb->pkt_type == PACKET_OTHERHOST ||
 	    skb->pkt_type == PACKET_LOOPBACK)
-		goto freeskb;
+		goto consumeskb;
 
 	skb = skb_share_check(skb, GFP_ATOMIC);
 	if (!skb)
@@ -974,6 +975,9 @@ static int arp_rcv(struct sk_buff *skb, struct net_device *dev,
 
 	return NF_HOOK(NFPROTO_ARP, NF_ARP_IN, skb, dev, NULL, arp_process);
 
+consumeskb:
+	consume_skb(skb);
+	return 0;
 freeskb:
 	kfree_skb(skb);
 out_of_mem:
--
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