Thread (4 messages) flat view 4 messages, 4 authors, 2022-03-09

Re: [PATCH v3 net-next] net-core: add rx_otherhost_dropped counter

From: David Ahern <dsahern@kernel.org>
Date: 2022-03-08 22:51:43
Also in: lkml

On 3/8/22 2:25 PM, Jeffrey Ji wrote:
quoted hunk ↗ jump to hunk
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 95f7bb052784..8b87ea99904b 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -451,6 +451,7 @@ static struct sk_buff *ip_rcv_core(struct sk_buff *skb, struct net *net)
 	 * that it receives, do not try to analyse it.
 	 */
 	if (skb->pkt_type == PACKET_OTHERHOST) {
+		atomic_long_inc(&skb->dev->rx_otherhost_dropped);
 		drop_reason = SKB_DROP_REASON_OTHERHOST;
 		goto drop;
 	}
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 5b5ea35635f9..5624c937f87f 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -150,6 +150,7 @@ static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev,
 	struct inet6_dev *idev;
 
 	if (skb->pkt_type == PACKET_OTHERHOST) {
+		atomic_long_inc(&skb->dev->rx_otherhost_dropped);
 		kfree_skb(skb);
 		return NULL;
 	}
that's an expensive packet counter for a common path (e.g., hosting
environments).
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