netdev - Re: [PATCH net v5] failover: allow name change on IFF

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Message-ID: <20190403084646.1aee960c@shemminger-XPS-13-9360>
Date:   Wed, 3 Apr 2019 08:46:46 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
Cc:     si-wei liu <si-wei.liu@...cle.com>, mst@...hat.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 v5] failover: allow name change on IFF_UP slave
 interfaces

On Tue, 2 Apr 2019 22:22:18 -0700
"Samudrala, Sridhar" <sridhar.samudrala@...el.com> wrote:

> On 4/2/2019 8:14 PM, Stephen Hemminger wrote:
> > On Tue, 2 Apr 2019 15:23:29 -0700
> > si-wei liu <si-wei.liu@...cle.com> wrote:
> >   
> >> On 4/2/2019 2:53 PM, Stephen Hemminger wrote:  
> >>> On Mon,  1 Apr 2019 19:04:53 -0400
> >>> Si-Wei Liu <si-wei.liu@...cle.com> wrote:
> >>>     
> >>>> +	if (dev->flags & IFF_UP &&
> >>>> +	    likely(!(dev->priv_flags & IFF_FAILOVER_SLAVE)))  
> >>> Why is property limited to failover slave, it would make sense for netvsc
> >>> as well. Why not make it a flag like live address change?  
> >> Well, netvsc today is still taking the delayed approach meaning that it
> >> is incompatible yet with this live name change flag if need be. ;-)
> >>
> >> I thought Sridhar did not like to introduce an additional
> >> IFF_SLAVE_RENAME_OK flag given that failover slave is the only consumer
> >> for the time being. Even though I can get it back, patch is needed for
> >> netvsc to remove the VF takeover delay IMHO.
> >>
> >> Sridhar, what do you think we revive the IFF_SLAVE_RENAME_OK flag which
> >> allows netvsc to be used later on? Or maybe, IFF_LIVE_RENAME_OK for a
> >> better name?
> >>
> >> -Siwei  
> > 
> > I would name it IFF_LIVE_NAME_CHANGE to match IFF_LIVE_ADDR_CHANGE
> > there is no reason its use should be restricted to SLAVE devices.
> >  
> Stephen,
> May be you should consider moving netvsc to use the net_failover driver now?
> 

NO

Why would I waste time doing that when there is a working and cleaner solution
that is working across 4 OS's and three versions of five major distributions?