linux-kernel - RE: [PATCHv2] hv_set_ifconfig.sh double check before setting ip

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Date:   Mon, 28 Aug 2017 16:48:32 +0000
From:   KY Srinivasan <kys@...rosoft.com>
To:     Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Eduardo Otubo <otubo@...hat.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "Stephen Hemminger" <sthemmin@...rosoft.com>,
        David Miller <davem@...emloft.net>
Subject: RE: [PATCHv2] hv_set_ifconfig.sh double check before setting ip



> -----Original Message-----
> From: Haiyang Zhang
> Sent: Monday, August 28, 2017 8:57 AM
> To: Stephen Hemminger <stephen@...workplumber.org>; Eduardo Otubo
> <otubo@...hat.com>; KY Srinivasan <kys@...rosoft.com>
> Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org; Stephen
> Hemminger <sthemmin@...rosoft.com>; David Miller
> <davem@...emloft.net>
> Subject: RE: [PATCHv2] hv_set_ifconfig.sh double check before setting ip
> 
> 
> 
> > -----Original Message-----
> > From: Stephen Hemminger [mailto:stephen@...workplumber.org]
> > Sent: Monday, August 28, 2017 11:16 AM
> > To: Eduardo Otubo <otubo@...hat.com>
> > Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org; Haiyang
> > Zhang <haiyangz@...rosoft.com>; Stephen Hemminger
> > <sthemmin@...rosoft.com>; David Miller <davem@...emloft.net>
> > Subject: Re: [PATCHv2] hv_set_ifconfig.sh double check before setting ip
> >
> > On Mon, 28 Aug 2017 12:01:21 +0200
> > Eduardo Otubo <otubo@...hat.com> wrote:
> >
> > > v2: The script is now a little bit safer so it doesn't conflicts with
> > > network daemon trying to set configurations at the same time.
> > >
> > > This patch fixes the behavior of the hv_set_ifconfig script when
> > setting
> > > the interface ip. Sometimes the interface has already been configured
> > by
> > > network daemon, in this case hv_set_ifconfig causes "RTNETLINK: file
> > > exists error"; in order to avoid this error this patch makes sure
> > double
> > > checks the interface before trying anything.
> > >
> > > Signed-off-by: Eduardo Otubo <otubo@...hat.com>
> >
> > Adding new dependency on systemd is not going to make this script
> > even less useful.  I wonder why the script still exists at all? Most of
> > the
> > Linux distro's can already setup HV networking without it.
> >
> 
> This script is used by a host to inject IP into guests. KY knows more
> details about it.

I wrote this script initially to provide an example script for Distros to base their solution on.
KVP supports IP injection to enable VM migration. For this scenario, I think we recommend that NM be
disabled.

K. Y
>