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Date:   Mon, 18 Jul 2022 19:01:30 +0100
From:   "Russell King (Oracle)" <>
To:     Andrew Lunn <>
Cc:     Sean Anderson <>,
        "David S . Miller" <>,
        Jakub Kicinski <>,
        Madalin Bucur <>,,
        Paolo Abeni <>,
        Eric Dumazet <>,,,
        Alexandru Marginean <>,
        Heiner Kallweit <>,
        Vladimir Oltean <>
Subject: Re: [PATCH net-next v3 08/47] net: phylink: Support differing link
 speeds and interface speeds

On Mon, Jul 18, 2022 at 07:28:58PM +0200, Andrew Lunn wrote:
> > > I am rather worried that we have drivers using ->speed today in their
> > > mac_config and we're redefining what that means in this patch.
> > 
> > Well, kind of. Previously, interface speed was defined to be link speed,
> > and both were just "speed". The MAC driver doesn't really care what the
> > link speed is if there is a phy, just how fast the phy interface mode
> > speed is.
> I'm not sure that is true. At least for SGMII, the MAC is passed the
> line side speed, which can be 10, 100, or 1G. The PHY interface mode
> speed is fixed at 1G, since it is SGMII, but the MAC needs to know if
> it needs to repeat symbols because the line side speed is lower than
> the host side speed.

... and passing the SGMII link speed (1G) will break a lot of stuff
where the MAC/PCS may need to know the media speed to do the right
number of symbol replication.

So I don't think we can get away with just saying ->speed is the link
speed which will prevent drivers breaking. I don't think it's that
simple. Like everything with phylink, all the drivers need to be looked
at and tweaked with every damn change, which makes phylink development
painfully slow.

RMK's Patch system:
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

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