linux-kernel - Re: [PATCH v3 RFC 3/4] net: dsa: hsr: Enable in KSZ9477 switch HW HSR offloading

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Message-ID: <20230905134837.dzp3yk2hjgt6hf4a@skbuf>
Date:   Tue, 5 Sep 2023 16:48:37 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Lukasz Majewski <lukma@...x.de>
Cc:     Eric Dumazet <edumazet@...gle.com>, Andrew Lunn <andrew@...n.ch>,
        davem@...emloft.net, Paolo Abeni <pabeni@...hat.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Tristram.Ha@...rochip.com, Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>, UNGLinuxDriver@...rochip.com,
        George McCollister <george.mccollister@...il.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 RFC 3/4] net: dsa: hsr: Enable in KSZ9477 switch HW
 HSR offloading

On Tue, Sep 05, 2023 at 04:03:55PM +0300, Vladimir Oltean wrote:
> > > What are the causes due to which self-address filtering and duplicate
> > > elimination only work "most of the time"?
> > 
> > Please refer to section "KSZ9477 CHIP LIMITATIONS" in:
> > https://ww1.microchip.com/downloads/en/Appnotes/AN3474-KSZ9477-High-Availability-Seamless-Redundancy-Application-Note-00003474A.pdf
> 
> Ok, so the limitation is a race condition in hardware such that, when
> duplicate packets are received on member ports very close in time to
> each other, the hardware fails to detect that they're duplicates.

It would be good to leave at least the link as part of the comment,
if not also a short summary (in case the PDF URL gets moved/removed).