netdev - Re: [PATCH net] net: libwx: fix device bus LAN ID

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Message-ID: <aQsf2tTu3_FAeRic@horms.kernel.org>
Date: Wed, 5 Nov 2025 09:58:50 +0000
From: Simon Horman <horms@...nel.org>
To: Jiawen Wu <jiawenwu@...stnetic.com>
Cc: netdev@...r.kernel.org, Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Mengyuan Lou <mengyuanlou@...-swift.com>, stable@...r.kernel.org
Subject: Re: [PATCH net] net: libwx: fix device bus LAN ID

On Tue, Nov 04, 2025 at 02:23:21PM +0800, Jiawen Wu wrote:
> The device bus LAN ID was obtained from PCI_FUNC(), but when a PF
> port is passthrough to a virtual machine, the function number may not
> match the actual port index on the device. This could cause the driver
> to perform operations such as LAN reset on the wrong port.
> 
> Fix this by reading the LAN ID from port status register.
> 
> Fixes: a34b3e6ed8fb ("net: txgbe: Store PCI info")
> Cc: stable@...r.kernel.org
> Signed-off-by: Jiawen Wu <jiawenwu@...stnetic.com>

Hi Jiawen Wu,

I am wondering if these devises also support port swapping (maybe LAN
Function Select bit of FACTPS). And if so, does it need to be taken into
account here?

...