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SubjectRe: [PATCH v3 net-next] net-core: add rx_otherhost_dropped counter
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On 3/8/22 2:25 PM, Jeffrey Ji wrote:
> 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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