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

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Date:   Mon, 15 Oct 2018 23:27:41 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Ido Schimmel <idosch@...lanox.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next 11/18] vxlan: Add netif_is_vxlan()

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.