netdev - Re: [PATCH net-next 11/18] vxlan: Add netif_is

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Message-ID: <20181015133323.790f3059@xeon-e3>
Date:   Mon, 15 Oct 2018 13:33:23 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Ido Schimmel <idosch@...sch.org>,
        Ido Schimmel <idosch@...lanox.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 11/18] vxlan: Add netif_is_vxlan()

On Mon, 15 Oct 2018 13:30:41 -0700
Jakub Kicinski <jakub.kicinski@...ronome.com> wrote:

> On Mon, 15 Oct 2018 23:27:41 +0300, Ido Schimmel wrote:
> > On Mon, Oct 15, 2018 at 01:16:42PM -0700, Stephen Hemminger wrote:  
> > > On Mon, 15 Oct 2018 22:57:48 +0300
> > > Ido Schimmel <idosch@...lanox.com> wrote:
> > >     
> > > > On Mon, Oct 15, 2018 at 11:57:56AM -0700, Jakub Kicinski wrote:    
> > > > > On Sat, 13 Oct 2018 17:18:38 +0000, Ido Schimmel wrote:      
> > > > > > Add the ability to determine whether a netdev is a VxLAN netdev by
> > > > > > calling the above mentioned function that checks the netdev's private
> > > > > > flags.
> > > > > > 
> > > > > > This will allow modules to identify netdev events involving a VxLAN
> > > > > > netdev and act accordingly. For example, drivers capable of VxLAN
> > > > > > offload will need to configure the underlying device when a VxLAN netdev
> > > > > > is being enslaved to an offloaded bridge.
> > > > > > 
> > > > > > Signed-off-by: Ido Schimmel <idosch@...lanox.com>
> > > > > > Reviewed-by: Petr Machata <petrm@...lanox.com>      
> > > > > 
> > > > > Is this preferable over
> > > > > 
> > > > > !strcmp(netdev->rtnl_link_ops->kind, "vxlan")
> > > > > 
> > > > > which is what TC offloads do?      
> > > > 
> > > > Using a flag seemed like the more standard way.
> > > > 
> > > > That being said, we considered using net_device_ops instead, given we
> > > > are about to run out of available private flags, so I don't mind
> > > > adopting a technique already employed by another driver.
> > > > 
> > > > P.S. Had to Cc netdev again. I think your client somehow messed the Cc
> > > > list? I see Cc list in your reply, but with back slashes at the end of
> > > > two email addresses.    
> > > 
> > > Agree that using a global resource bit in flags is probably overkill.
> > > If you can use kind that would be good example for other drivers as well.    
> > 
> > OK, will change.
> > 
> > Jakub, any objections if I implement netif_is_vxlan() using 'kind' and
> > convert nfp to use the helper? Having all these helpers in the same
> > location will increase the chances of others reusing them.  
> 
> Sounds very good :)

We could even do this for bridge, and other devices that are using private flags.