netdev - Re: [RFC v3 3/3] vxlan: handle underlay VRF changes

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Message-ID: <CAJieiUiAho4UGbJP8Zcf-1_ErNu+jq_P6EqOKUQFqONRpsTD9w@mail.gmail.com>
Date:   Tue, 20 Nov 2018 07:35:18 -0800
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     David Ahern <dsa@...ulusnetworks.com>
Cc:     abauvin@...leway.com, netdev <netdev@...r.kernel.org>,
        akherbouche@...leway.com
Subject: Re: [RFC v3 3/3] vxlan: handle underlay VRF changes

On Tue, Nov 20, 2018 at 7:04 AM David Ahern <dsa@...ulusnetworks.com> wrote:
>
> On 11/20/18 7:23 AM, Alexis Bauvin wrote:
> > When underlay VRF changes, either because the lower device itself changed,
> > or its VRF changed, this patch releases the current socket of the VXLAN
> > device and recreates another one in the right VRF. This allows for
> > on-the-fly change of the underlay VRF of a VXLAN device.
> >
> > Signed-off-by: Alexis Bauvin <abauvin@...leway.com>
> > Reviewed-by: Amine Kherbouche <akherbouche@...leway.com>
> > Tested-by: Amine Kherbouche <akherbouche@...leway.com>
> > ---
> >  drivers/net/vxlan.c | 94 +++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 94 insertions(+)
> >
> > diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
> > index a3de08122269..1e6ccad6df6a 100644
> > --- a/drivers/net/vxlan.c
> > +++ b/drivers/net/vxlan.c
> > @@ -208,6 +208,18 @@ static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
> >       return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
> >  }
> >
> > +static int vxlan_is_in_l3mdev_chain(struct net_device *chain,
> > +                                 struct net_device *dev)
> > +{
> > +     if (!chain)
> > +             return 0;
> > +
> > +     if (chain->ifindex == dev->ifindex)
> > +             return 1;
> > +     return vxlan_is_in_l3mdev_chain(netdev_master_upper_dev_get(chain),
> > +                                     dev);
> > +}
>
> This should return bool and true/false.
>
> Also, why l3mdev in the name? None of the checks look at whether it is
> an l3mdev master.
>
> And again here, someone more familiar with the vxlan code should review it.
>


I understand the need for patch 2. But I don't understand the need for
the complexity this patch introduces (especially implicit down and up
of the vxlan device).
Alexis, If your underlay routing changes,  you can down and up the
vxlan device from user-space correct ?. This should be true for any
tunnel device.