netdev - Re: [PATCH net-next] net/mlx4_core: Fix backward compatibility on VFs

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Message-ID: <20160320070759.GA2935@yuval-lap.uk.oracle.com>
Date:	Sun, 20 Mar 2016 09:07:59 +0200
From:	Yuval Shaia <yuval.shaia@...cle.com>
To:	eli@...lanox.com, David Miller <davem@...emloft.net>
Cc:	eli@...lanox.com, linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org, aik@...abs.ru
Subject: Re: [PATCH net-next] net/mlx4_core: Fix backward compatibility on VFs

On Fri, Mar 18, 2016 at 11:11:06PM -0400, David Miller wrote:
> From: Eli Cohen <eli@...lanox.com>
> Date: Thu, 17 Mar 2016 18:49:42 +0200
> 
> > Commit 85743f1eb345 ("net/mlx4_core: Set UAR page size to 4KB regardless
> > of system page size") introduced dependency where old VF drivers without
> > this fix fail to load if the PF driver runs with this commit.
> > 
> > To resolve this add a module parameter which disables that functionality
> > by default.  If both the PF and VFs are running with a driver with that
> > commit the administrator may set the module param to true.
> > 
> > The module parameter is called enable_4k_uar.
Can you consider passing this via comm-channel and save us all from new
module parameter?
Suggesting this from sys-admin perspective where (1) making this consist in
VF and **all** guests would me a nightmare and also (2) take into account
in public cloud that hypervisor sys-admin is not necessary the same person
as guest sys-admin.
> > 
> > Fixes: 85743f1eb345 ('net/mlx4_core: Set UAR page size to 4KB ...')
> > Signed-off-by: Eli Cohen <eli@...lanox.com>
> 
> Applied.
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