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

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Date:   Sun, 7 Apr 2019 08:41:52 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
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, 5 Apr 2019 18:01:43 -0400
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> > 
> > 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.


I don't think it matters because if device named is changed and it
is down (!IFF_UP) then only CHANGENAME is sent. The NETDEV_CHANGE is
just noise to an application.