netdev - Re: [PATCH net-next] net: phy: prefer 1000baseT over 1000baseKX

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Message-ID: <YbDgoKICfdKA9Cs7@lunn.ch>
Date:   Wed, 8 Dec 2021 17:43:12 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next] net: phy: prefer 1000baseT over 1000baseKX

On Wed, Dec 08, 2021 at 11:36:30AM +0000, Russell King (Oracle) wrote:
> The PHY settings table is supposed to be sorted by descending match
> priority - in other words, earlier entries are preferred over later
> entries.
> 
> The order of 1000baseKX/Full and 1000baseT/Full is such that we
> prefer 1000baseKX/Full over 1000baseT/Full, but 1000baseKX/Full is
> a lot rarer than 1000baseT/Full, and thus is much less likely to
> be preferred.
> 
> This causes phylink problems - it means a fixed link specifying a
> speed of 1G and full duplex gets an ethtool linkmode of 1000baseKX/Full
> rather than 1000baseT/Full as would be expected - and since we offer
> userspace a software emulation of a conventional copper PHY, we want
> to offer copper modes in preference to anything else. However, we do
> still want to allow the rarer modes as well.
> 
> Hence, let's reorder these two modes to prefer copper.
> 
> Tested-by: Tom Lendacky <thomas.lendacky@....com>
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew