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

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Message-ID: <20230905172050.2834d2df@wsk>
Date: Tue, 5 Sep 2023 17:20:50 +0200
From: Lukasz Majewski <lukma@...x.de>
To: Vladimir Oltean <olteanv@...il.com>
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

Hi Vladimir,

> 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).

Ok.


Best regards,

Lukasz Majewski

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