linux-kernel - Re: [PATCH net-next] ptp: add vclock timestamp conversion IOCTL

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Message-ID: <20210927145916.GA9549@hoboy.vegasvil.org>
Date:   Mon, 27 Sep 2021 07:59:16 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Sebastien Laveze <sebastien.laveze@....nxp.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        yangbo.lu@....com, yannick.vignon@....nxp.com,
        rui.sousa@....nxp.com
Subject: Re: [PATCH net-next] ptp: add vclock timestamp conversion IOCTL

On Mon, Sep 27, 2021 at 11:32:50AM +0200, Sebastien Laveze wrote:
> Add an IOCTL to perform per-timestamp conversion, as an extension of the
> ptp virtual framework introduced in commit 5d43f951b1ac ("ptp: add ptp
> virtual clock driver framework").

I'm not wild about having yet another ioctl for functionality that
already exists.

> This binding works well if the application requires all timestamps in the
> same domain but is not convenient when multiple domains need to be
> supported using a single socket.

Opening multiple sockets is not rocket science.
 
> Typically, IEEE 802.1AS-2020 can be implemented using a single socket,
> the CMLDS layer using raw PHC timestamps and the domain specific
> timestamps converted in the appropriate gPTP domain using this IOCTL.

You say "typically", but how many applications actually do this?  I
can't think of any at all.

Thanks,
Richard