On Tue, 19 Dec 2017 15:44:05 -0800, Stephen Hemminger wrote:
> On Tue, 19 Dec 2017 15:20:57 -0800
> Jakub Kicinski <jakub.kicin...@netronome.com> wrote:
>
> > On Tue, 19 Dec 2017 14:50:17 -0800, Stephen Hemminger wrote:
> > > On Tue, 19 Dec 2017 14:44:37 -0800
> > > "Samudrala, Sridhar" <sridhar.samudr...@intel.com> wrote:
> > >
> > > > -static void __netvsc_vf_setup(struct net_device *ndev,
> > > > > - struct net_device *vf_netdev)
> > > > > -{
> > > > > - int ret;
> > > > > + /* set the name of VF device based on upper device name */
> > > > > + snprintf(vf_name, IFNAMSIZ, "%s_vf", ndev->name);
> > > > > + ret = dev_change_name(vf_netdev, vf_name);
> > > > > + if (ret != 0)
> > > > > + netdev_warn(vf_netdev,
> > > > > + "can not rename device: (%d)\n", ret);
> > > > >
> > > >
> > > > It is possible that upper device name can change after this call. I
> > > > noticed this
> > > > when i tried this approach with virtio_net.
> > > >
> > > > Also, what should happen if the upper device is unloaded? Should we
> > > > rename
> > > > the VF name?
> > >
> > > Yes upper device can change name. So sure, netdevice could trap that
> > > in callback (it already has notifier) and rename VF. Will add that in V2.
> > >
> > > If upper device is unloaded then it is already decoupled from the VF.
> > > There is no good value to change it back to. The orignal name probably
> > > has been reused by then.
> >
> > Both of those issues would be solved by just exposing phys_port_name
> > from the VF driver, and letting systemd do its thing independent of
> > magic bonds.
> >
> > Reluctance to do driver work aside :/
>
> The port name for Mellanox driver is already set in the driver as a numeric
> value.
> It indicates which port is used.
> This won't work.
You must be looking at representor ndos. I don't think MLX NIC drivers
are implementing phys_port_name for normal netdevs at all today.
