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

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Date:   Tue, 12 Apr 2022 14:46:55 -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 Tue, Apr 12, 2022 at 09:24:10PM +0200, Gerhard Engleder wrote:
> I'm thinking about why there should be a slow path with lookup. If the
> address/cookie
> points to a defined data structure with two timestamps, then no lookup
> for the phc or
> netdev is necessary. It should be possible for every driver to
> allocate a skbuff with enough
> space for this structure in front of the received Ethernet frame.

Adding 16 bytes for every allocated skbuff is going to be a tough
sell.  Most people don't want/need this.

Thanks,
Richard