netdev - Re: [PATCH net v6] failover: allow name change on IFF

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Date:   Fri, 5 Apr 2019 18:01:43 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Si-Wei Liu <si-wei.liu@...cle.com>, sridhar.samudrala@...el.com,
        davem@...emloft.net, kubakici@...pl, alexander.duyck@...il.com,
        jiri@...nulli.us, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, liran.alon@...cle.com,
        boris.ostrovsky@...cle.com, vijay.balakrishna@...cle.com
Subject: Re: [PATCH net v6] failover: allow name change on IFF_UP slave
 interfaces

On Fri, Apr 05, 2019 at 02:47:01PM -0700, Stephen Hemminger wrote:
> On Wed,  3 Apr 2019 00:52:47 -0400
> Si-Wei Liu <si-wei.liu@...cle.com> wrote:
> 
> >  
> > +	if (unlikely(dev->flags & IFF_UP)) {
> > +		struct netdev_notifier_change_info change_info = {
> > +			.info.dev = dev,
> > +		};
> > +
> > +		call_netdevice_notifiers_info(NETDEV_CHANGE,
> > +					      &change_info.info);
> > +	}
> 
> This notifier is not really necessary, there already is a CHANGENAME
> that gets sent.
> NETDEV_CHANGE is used in other cases to mean that the state (flags)
> have changed.

The point is some existing scripts might not expect name
change to happen without a status change afterwards (since it was
impossible for so long). So this reports a change
to make sure scripts do not miss it.