netdev - Re: [PATCH net] net: phylink: initialize carrier state at creation

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Date: Mon, 6 Nov 2023 18:36:05 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Klaus Kudielka <klaus.kudielka@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: phylink: initialize carrier state at creation

On Mon, Nov 06, 2023 at 07:05:06PM +0100, Klaus Kudielka wrote:
> Background: Turris Omnia (Armada 385); eth2 (mvneta) connected to SFP bus;
> SFP module is present, but no fiber connected, so definitely no carrier.
> 
> After booting, eth2 is down, but netdev LED trigger surprisingly reports
> link active. Then, after "ip link set eth2 up", the link indicator goes
> away - as I would have expected it from the beginning.
> 
> It turns out, that the default carrier state after netdev creation is
> "carrier ok". Some ethernet drivers explicitly call netif_carrier_off
> during probing, others (like mvneta) don't - which explains the current
> behaviour: only when the device is brought up, phylink_start calls
> netif_carrier_off.
> 
> Fix this for all drivers, by calling netif_carrier_off in phylink_create.
> 
> Suggested-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Klaus Kudielka <klaus.kudielka@...il.com>

Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

Thanks!

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!