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Date:   Wed, 13 Apr 2022 23:36:27 -0700
From:   Richard Cochran <>
To:     Gerhard Engleder <>
Cc:     Vinicius Costa Gomes <>,,
        David Miller <>,
        Jakub Kicinski <>,,
        netdev <>
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

> 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.


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