From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Klaus Kudielka <klaus.kudielka@gmail.com>
Cc: Andrew Lunn <andrew@lunn.ch>,
Heiner Kallweit <hkallweit1@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net] net: phylink: initialize carrier state at creation
Date: Mon, 6 Nov 2023 18:36:05 +0000 [thread overview]
Message-ID: <ZUkyFaFHdRIoj9YK@shell.armlinux.org.uk> (raw)
In-Reply-To: <20231106180506.2665-1-klaus.kudielka@gmail.com>
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@lunn.ch>
> Signed-off-by: Klaus Kudielka <klaus.kudielka@gmail.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.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!
next prev parent reply other threads:[~2023-11-06 18:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-06 18:05 [PATCH net] net: phylink: initialize carrier state at creation Klaus Kudielka
2023-11-06 18:36 ` Russell King (Oracle) [this message]
2023-11-06 21:26 ` Andrew Lunn
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