netdev - Re: [patch net-next 6/9] mlxsw: spectrum: Unmap local port from module during teardown

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Date:	Mon, 22 Feb 2016 12:32:47 -0800
From:	John Fastabend <john.fastabend@...il.com>
To:	Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
CC:	davem@...emloft.net, idosch@...lanox.com, eladr@...lanox.com,
	yotamg@...lanox.com, ogerlitz@...lanox.com, yishaih@...lanox.com,
	dledford@...hat.com, sean.hefty@...el.com,
	hal.rosenstock@...il.com, eugenia@...lanox.com,
	roopa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
	hadarh@...lanox.com, jhs@...atatu.com, jeffrey.t.kirsher@...el.com,
	brouer@...hat.com, ivecera@...hat.com, rami.rosen@...el.com
Subject: Re: [patch net-next 6/9] mlxsw: spectrum: Unmap local port from module
 during teardown

On 16-02-22 10:32 AM, Jiri Pirko wrote:
> From: Ido Schimmel <idosch@...lanox.com>
> 
> When splitting a port we replace it with 2 or 4 other ports. To be able
> to do that we need to remove the original port netdev and unmap it from
> its module. However, we first mark it as disabled, as active ports
> cannot be unmapped.
> 
> Signed-off-by: Ido Schimmel <idosch@...lanox.com>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---

Hi Jiri, Ido,

You've sort of lost me on this port splitting/unsplitting thread. What
does this actually do? Are you just creating two netdevs and LAGing them
in the hardware, I'm guessing not or you wouldn't have some device API
for it and would do it using normal methods.

If its something to do with physical layout of the board itself why
don't you trigger this based on some init time introspection or an
interrupt if someone plugs in a port splitting cable/module (does that
exist?).

Thanks,
John