netdev - Re: [PATCH net] i40e: Match VF MAC deletion behaviour with OOT driver

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Message-ID: <20250623162032.GB506049@horms.kernel.org>
Date: Mon, 23 Jun 2025 17:20:32 +0100
From: Simon Horman <horms@...nel.org>
To: Jamie Bainbridge <jamie.bainbridge@...il.com>
Cc: Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	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>,
	Brett Creeley <brett.creeley@....com>,
	Ivan Vecera <ivecera@...hat.com>,
	Michal Schmidt <mschmidt@...hat.com>,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] i40e: Match VF MAC deletion behaviour with OOT driver

On Mon, Jun 23, 2025 at 09:04:41AM +1000, Jamie Bainbridge wrote:
> When the PF is processing an AQ message to delete a VF's MACs from the
> MAC filter, the Linux kernel driver checks if the PF set the MAC and if
> the VF is trusted. However, the out-of-tree driver has intentionally
> removed the check for VF trust with OOT driver version 2.26.8.
> 
> This results in an undesirable behaviour difference between the OOT
> driver and the Linux driver, where if a trusted VF with a PF-set MAC
> sets itself down (which sends an AQ message to delete the VF's MAC
> filters) then the VF MAC is erased from the interface with the Linux
> kernel driver but not with the OOT driver.
> 
> This results in the VF losing its PF-set MAC which should not happen.
> 
> Change the Linux kernel driver and comment to match the OOT behaviour.
> 
> Fixes: ea2a1cfc3b201 ("i40e: Fix VF MAC filter removal")
> Signed-off-by: Jamie Bainbridge <jamie.bainbridge@...il.com>

Hi Jamie,

I hate to be a pain but I'm wondering if we could rephrase the subject
and patch description to emphasis that this is correcting undesirable
(incorrect?) behaviour. And as a footnote, that the new behaviour matches
the OOT driver.

Correctness is what matters most from an upstream PoV.

Thanks!