linux-kernel - Re: [PATCH net-next v3 3/3] net: icmp: add reasons of the skb drops to icmp protocol

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Date:   Wed, 16 Mar 2022 21:05:34 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     David Ahern <dsahern@...nel.org>
Cc:     menglong8.dong@...il.com, pabeni@...hat.com, rostedt@...dmis.org,
        mingo@...hat.com, xeb@...l.ru, davem@...emloft.net,
        yoshfuji@...ux-ipv6.org, imagedong@...cent.com,
        edumazet@...gle.com, kafai@...com, talalahmad@...gle.com,
        keescook@...omium.org, alobakin@...me, flyingpeng@...cent.com,
        mengensun@...cent.com, dongli.zhang@...cle.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        benbjiang@...cent.com
Subject: Re: [PATCH net-next v3 3/3] net: icmp: add reasons of the skb drops
 to icmp protocol

On Wed, 16 Mar 2022 21:35:47 -0600 David Ahern wrote:
> On 3/16/22 9:18 PM, Jakub Kicinski wrote:
> > 
> > I guess this set raises the follow up question to Dave if adding 
> > drop reasons to places with MIB exception stats means improving 
> > the granularity or one MIB stat == one reason?
> 
> There are a few examples where multiple MIB stats are bumped on a drop,
> but the reason code should always be set based on first failure. Did you
> mean something else with your question?

I meant whether we want to differentiate between TYPE, and BROADCAST or
whatever other possible invalid protocol cases we can get here or just
dump them all into a single protocol error code.