netdev - Re: [PATCH net-next 1/3] net: phylink: Set host

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Date:   Tue, 3 Jan 2023 09:54:18 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc:     andrew@...n.ch, hkallweit1@...il.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH net-next 1/3] net: phylink: Set host_interfaces for a
 non-sfp PHY

On Mon, Dec 26, 2022 at 04:14:23PM +0900, Yoshihiro Shimoda wrote:
> Set phy_dev->host_interfaces by pl->link_interface in
> phylink_fwnode_phy_connect() for a non-sfp PHY.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> ---
>  drivers/net/phy/phylink.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index 09cc65c0da93..1958d6cc9ef9 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -1809,6 +1809,7 @@ int phylink_fwnode_phy_connect(struct phylink *pl,
>  		pl->link_interface = phy_dev->interface;
>  		pl->link_config.interface = pl->link_interface;
>  	}
> +	__set_bit(pl->link_interface, phy_dev->host_interfaces);

This is probably going to break Macchiatobin platforms, since we
declare that the link mode there is 10GBASE-R, we'll end up with
host_interfaces containing just this mode. This will cause the
88x3310 driver to select a rate matching interface mode, which the
mvpp2 MAC can't support.

If we want to fill host_interfaces in, then it needs to be filled in
properly - and by that I mean with all the host interface modes that
can be electrically supported - otherwise platforms will break.

So, sorry, but NAK on this change.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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