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

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Message-ID: <20220122020854.GA23783@hoboy.vegasvil.org>
Date:   Fri, 21 Jan 2022 18:08:54 -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 04:23:27PM +0000, Vladimir Oltean wrote:
> On Fri, Jan 21, 2022 at 07:28:20AM -0800, Richard Cochran wrote:
> > 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.
> 
> I don't think my proposal is out of scope.

I don't see a way to implement your proposal at all.

If you want to implement your proposal and submit a patch series, I
will gladly drop mine in favor of yours.  Otherwise, my series solves
a real world problem and improves the stack at least a little bit.

Thanks,
Richard