From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH] Hyperv: Trigger DHCP renew after host hibernation
Date: Fri, 8 Aug 2014 09:28:42 -0700
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Cc: "driverdev-devel@linuxdriverproject.org\"
 <driverdev-devel@linuxdriverproject.org>,
 Haiyang Zhang  <haiyangz@microsoft.com>, LKML <linux-kernel@vger.kernel.org>,
 Thomas Shao  <huishao@microsoft.com>, "@osuosl.org,
 "olaf@aepfle.de" <olaf@aepfle.de>, Yue@osuosl.org,
 Richard Weinberger <richard.weinberger@gmail.com>,
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 David Miller <davem@davemloft.net>"@osuosl.org>, Zhang@osuosl.org
To: Greg KH <gregkh@linuxfoundation.org>
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On Fri, 8 Aug 2014 06:45:49 -0700
Greg KH <gregkh@linuxfoundation.org> wrote:

> On Fri, Aug 08, 2014 at 08:11:20AM +0000, Dexuan Cui wrote:
> > > From: Greg KH [mailto:gregkh@linuxfoundation.org]
> > > Sent: Friday, August 8, 2014 11:32 AM
> > > > Hi Richard and all,
> > > >
> > > > IMO the most feasible and need-the-least-change solution may be:
> > > > the hyperv network VSC driver passes the event
> > > > RNDIS_STATUS_NETWORK_CHANGE to the udev daemon?
> > > >
> > > > In this way, every distro only needs to add a udev rule, which should
> > > > be simple.
> > > 
> > > No, don't do that, again, act like any other network device, drop the
> > > link and bring it up when it comes back.
> > > 
> > > greg k-h
> > 
> > Hi Greg,
> > Thanks for the comment!
> > 
> > Do you mean tearing down the net device and re-creating it (by
> > register_netdev() and unregister_netdev)?
> 
> No, don't you have link-detect for your network device?  Toggle that, I
> thought patches to do this were posted a while ago...
> 
> But if you really want to tear the whole network device down and then
> back up again, sure, that would also work.
> 
> good luck,
> 
> greg k-h
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Call netif_carrier_off then netif_carrier_on to toggle the link detect
state of netdevice.