netdev - Re: [PATCH net-next v2 4/5] ptp: Support late timestamp determination

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Date:   Wed, 13 Apr 2022 23:36:27 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Gerhard Engleder <gerhard@...leder-embedded.com>
Cc:     Vinicius Costa Gomes <vinicius.gomes@...el.com>, yangbo.lu@....com,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, mlichvar@...hat.com,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 4/5] ptp: Support late timestamp determination

On Wed, Apr 13, 2022 at 10:51:54PM +0200, Gerhard Engleder wrote:
> For igc and tsnep the 16 bytes in front of the RX frame exist anyway.
> So this would be a minimal solution with best performance as a first
> step. A lookup for netdev/phc can be added in the future if there is
> a driver, which needs that.

It is a design mistake to base new kernel interfaces on hardware
quirks.

> Is it worth posting an implementation in that direction?

Sure, but please make thoughts about how this would work for the
non-igc world.

IIRC one of the nxp switches also has such counters?  You can start
with that.

Thanks,
Richard