netdev - Re: [PATCH net-next] net: ethtool: allow MAC drivers to override ethtool get_ts

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Message-ID: <20210121170347.GA22517@hoboy.vegasvil.org>
Date:   Thu, 21 Jan 2021 09:03:47 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: ethtool: allow MAC drivers to override
 ethtool get_ts_info

On Thu, Jan 21, 2021 at 05:22:37PM +0100, Andrew Lunn wrote:

> There is a growing interesting in PTP, the number of drivers keeps
> going up. The likelihood of MAC/PHY combination having two
> timestamping sources is growing all the time. So the stack needs to
> change to support the selection of the timestamp source.

Fine, but How should the support look like?

- New/extended time stamping API that delivers multiple time stamps?

- sysctl to select MAC/PHY preference at run time globally?

- per-interface ethtool control?

- per-socket control?  (probably not feasible, but heh)

Back of the napkin design ideas appreciated!

Thanks,
Richard