netdev - Re: [net-next V3 15/15] Documentation: networking: Add description for multi-pf netdev

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Date: Thu, 22 Feb 2024 08:51:36 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Tariq Toukan <ttoukan.linux@...il.com>,
	Saeed Mahameed <saeed@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>,
	Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
	Tariq Toukan <tariqt@...dia.com>, Gal Pressman <gal@...dia.com>,
	Leon Romanovsky <leonro@...dia.com>
Subject: Re: [net-next V3 15/15] Documentation: networking: Add description
 for multi-pf netdev

On Tue, Feb 20, 2024 at 05:33:09PM -0800, Jakub Kicinski wrote:
> Greg, we have a feature here where a single device of class net has
> multiple "bus parents". We used to have one attr under class net
> (device) which is a link to the bus parent. Now we either need to add
> more or not bother with the linking of the whole device. Is there any
> precedent / preference for solving this from the device model
> perspective?

How, logically, can a netdevice be controlled properly from 2 parent
devices on two different busses?  How is that even possible from a
physical point-of-view?  What exact bus types are involved here?

This "shouldn't" be possible as in the end, it's usually a PCI device
handling this all, right?

thanks,

greg k-h