netdev - Re: [PATCH V2 net-next 2/5] net: Introduce a new MII time stamping interface.

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Date:   Sun, 7 Oct 2018 14:20:33 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        David Miller <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Miroslav Lichvar <mlichvar@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH V2 net-next 2/5] net: Introduce a new MII time stamping
 interface.

On Sun, Oct 07, 2018 at 11:14:05PM +0200, Andrew Lunn wrote:
> The problem is you depend on skbuf->dev->phydev. phydev will be NULL.
> net_device does not currently have a phylink member. Even if it did,
> you end up add more and more tests looking every place a
> mii_timestamper could be placed.

Ok, so the way to do this is to have something like
CONFIG_NETWORK_PHYLINK_TIMESTAMPING.  We can deal with that if and
when any real devices appear.

> I'm currently thinking register_mii_timestamper() should take a netdev
> argument, and the net_device structure should gain a struct
> mii_timestamper.
> 
> But we have to look at the lifetime problems. A phydev does not know
> what netdev it is associated to until phy_connect() is called. It is
> at that point you can call register_mii_timestamper().

Right, IOW passing a netdev won't work.

Thanks,
Richard