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

Lukasz Majewski
2023-09-05T16:05:16Z

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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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