netdev - Re: [PATCH RFC V1 net-next 3/4] net: Let the active time stamping layer be selectable.

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Date:   Fri, 21 Jan 2022 07:28:20 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Jakub Kicinski <kuba@...nel.org>,
        Joakim Zhang <qiangqing.zhang@....com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Miroslav Lichvar <mlichvar@...hat.com>,
        Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH RFC V1 net-next 3/4] net: Let the active time stamping
 layer be selectable.

On Fri, Jan 21, 2022 at 02:50:36PM +0000, Vladimir Oltean wrote:
> So as I mentioned earlier, the use case would be hardware performance
> testing and diagnosing. You may consider that as not that important, but
> this is basically what I had to do for several months, and even wrote
> a program for that, that collects packet timestamps at all possible points.

This is not possible without making a brand new CMSG to accommodate
time stamps from all the various layers.

That is completely out of scope for this series.

The only practical use case of this series is to switch from PHY back to MAC.

Thanks,
Richard