netdev - Re: [patch net-next 04/10] net: Add netif_is_vrf

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Date:   Mon, 13 Mar 2017 09:15:32 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org,
        davem@...emloft.net, idosch@...lanox.com, mlxsw@...lanox.com,
        shm@...ulusnetworks.com, kuznet@....inr.ac.ru, jmorris@...ei.org,
        yoshfuji@...ux-ipv6.org, kaber@...sh.net, lorenzo@...gle.com,
        mateusz.bajorski@...ia.com
Subject: Re: [patch net-next 04/10] net: Add netif_is_vrf_master helper

On 3/13/17 9:01 AM, Ido Schimmel wrote:
> On Mon, Mar 13, 2017 at 08:39:19AM -0600, David Ahern wrote:
>> On 3/13/17 1:38 AM, Jiri Pirko wrote:
>>> From: Ido Schimmel <idosch@...lanox.com>
>>>
>>> Drivers capable of offloading VRF configurations need to know the ports
>>> are enslaved to an actual VRF device and not some other L3 master.
>>>
>>> Add a flag to indicate netdev is a VRF master and a corresponding
>>> helper.
>>>
>>> Signed-off-by: Ido Schimmel <idosch@...lanox.com>
>>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>>> ---
>>>  drivers/net/vrf.c         | 2 +-
>>>  include/linux/netdevice.h | 8 ++++++++
>>>  2 files changed, 9 insertions(+), 1 deletion(-)
>>>
>>
>> IFF_VRF_MASTER was renamed IFF_L3MDEV_MASTER 18 months ago.
> 
> But IFF_L3MDEV_MASTER isn't specific to the VRF driver. It can be set by
> other drivers including future ones that might be introduced. I need to
> allow enslavement to a VRF master, but reject others.
> 

Why isn't an L3MDEV associated with a FIB table sufficient? ie., the
L3MDEV_MASTER flag is set and the driver impements l3mdev_fib_table. At
that point, what is specific to a VRF device that the offload relies on?