netdev - Re: [PATCH net 2/3] net/mlx5e: Prevent entering switchdev mode with inconsistent netns

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Message-ID: <05a83eb7-7fb1-46ae-b7ba-bd366446b5f5@nvidia.com>
Date: Wed, 10 Sep 2025 11:01:18 +0800
From: Jianbo Liu <jianbol@...dia.com>
To: Jakub Kicinski <kuba@...nel.org>, Tariq Toukan <tariqt@...dia.com>
CC: Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>,
	Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>, "Mark
 Bloch" <mbloch@...dia.com>, <netdev@...r.kernel.org>,
	<linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Gal Pressman
	<gal@...dia.com>
Subject: Re: [PATCH net 2/3] net/mlx5e: Prevent entering switchdev mode with
 inconsistent netns



On 9/10/2025 9:23 AM, Jakub Kicinski wrote:
> On Mon, 8 Sep 2025 13:07:05 +0300 Tariq Toukan wrote:
>> If the PF's netns has been moved and differs from the devlink's netns,
>> enabling switchdev mode would create an invalid state where
>> representors and PF exist in different namespaces.
>>
>> To prevent this inconsistent configuration,
> 
> Could you explain clearly what is the problem with having different
> netdevs in different namespaces? From networking perspective it really
> doesn't matter.

There is a requirement from customer who wants to manage openvswitch in 
a container. But he can't complete the steps (changing eswitch and 
configuring OVS) in the container if the netns are different.
Besides, ibdev is dependent on netdev, there is refcnt issue if netdev 
is moved to other netns but devlink netns is not changed by "devlink dev 
reload netns" command.

Thanks!
Jianbo