netdev - Re: [PATCH net-next v1 2/3] net: dsa: ar9331: add support for pause stats

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Date:   Tue, 28 Jun 2022 09:22:53 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Vladimir Oltean <olteanv@...il.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Lukas Wunner <lukas@...ner.de>, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next v1 2/3] net: dsa: ar9331: add support for pause
 stats

> Yeah, the corrections are always iffy. I understand the doubts, and we
> can probably leave things "under-specified" until someone with a strong
> preference comes along. But I hope that the virt example makes it clear
> that neither of the choices is better (SR-IOV NICs would have to start
> adding the pause if we declare rtnl stats as inclusive).
> 
> I can see advantages to both counting (they are packets) and not
> counting those frames (Linux doesn't see them, they get "invented" 
> by HW).
> 
> Stats are hard.

I doubt we can define it either way. I once submitted a patch for one
driver to make it ignore CRC bytes. It then gave the exact same counts
as another hardware i was using, making the testing i was doing
simpler.

The patch got rejected simply because we have both, with CRC and
without CRC, neither is correct, neither is wrong.

So i would keep it KISS, pause frames can be included, but i would not
go to extra effort to include them, or to exclude them.

   Andrew