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

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Message-ID: <20220627091521.3b80a4e8@kernel.org>
Date:   Mon, 27 Jun 2022 09:15:21 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Vladimir Oltean <olteanv@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Andrew Lunn <andrew@...n.ch>,
        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

On Sun, 26 Jun 2022 19:10:08 +0200 Oleksij Rempel wrote:
> > Is there an authoritative source who is able to tell whether rtnl_link_stats64 ::
> > rx_packets and tx_packets should count PAUSE frames or not?  
> 
> Yes, it will be interesting to know how to proceed with it.

I'm curious as well, AFAIK most drivers do not count pause to ifc stats.

> For example KSZ switch do count pause frame Bytes together will other
> frames. At same time, atheros switch do not count pause frame bytes
> at all.
> 
> To make things worse, i can manually send pause frame of any size, so
> it will not be accounted by HW. What ever decision we will made, i
> will need to calculate typical pause frame size and hope it will fit
> for 90% of cases.

:(