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

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Message-ID: <093901dc4e3b$b753c630$25fb5290$@trustnetic.com>
Date: Wed, 5 Nov 2025 18:05:29 +0800
From: Jiawen Wu <jiawenwu@...stnetic.com>
To: "'Simon Horman'" <horms@...nel.org>
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 Wed, Nov 5, 2025 5:59 PM, Simon Horman wrote:
> 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?

Does not support yet, thanks. :)