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Date:   Tue, 25 Jan 2022 19:21:12 -0700
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Subject: Re: [PATCH net-next 4/6] net: ipv4: use kfree_skb_reason() in
 ip_protocol_deliver_rcu()
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To:     menglong8.dong@gmail.com, kuba@kernel.org
Cc:     rostedt@goodmis.org, mingo@redhat.com, davem@davemloft.net,
        yoshfuji@linux-ipv6.org, dsahern@kernel.org, pablo@netfilter.org,
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References: <20220124131538.1453657-1-imagedong@tencent.com>
 <20220124131538.1453657-5-imagedong@tencent.com>
From:   David Ahern <dsahern@gmail.com>
In-Reply-To: <20220124131538.1453657-5-imagedong@tencent.com>
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On 1/24/22 6:15 AM, menglong8.dong@gmail.com wrote:
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index 8942d32c0657..603f77ef2170 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -328,6 +328,8 @@ enum skb_drop_reason {

It would be worthwhile to document the meaning of these as you add them
-- long description of the enum.

>  	SKB_DROP_REASON_IP_RPFILTER,
>  	SKB_DROP_REASON_EARLY_DEMUX,
>  	SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,

	/* xfrm policy check failed */
> +	SKB_DROP_REASON_XFRM_POLICY,

	/* no support for IP protocol */
> +	SKB_DROP_REASON_IP_NOPROTO,
>  	SKB_DROP_REASON_MAX,
>  };
>  


If the enum is 1:1 with an SNMP counter, just state that.