netdev - Re: [PATCH] Hyperv: Trigger DHCP renew after host hibernation

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Message-ID: <20140808134549.GD4427@kroah.com>
Date:	Fri, 8 Aug 2014 06:45:49 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Dexuan Cui <decui@...rosoft.com>
Cc:	"olaf@...fle.de" <olaf@...fle.de>,
	Richard Weinberger <richard.weinberger@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Shao <huishao@...rosoft.com>,
	"Yue Zhang (OSTC DEV)" <yuezha@...rosoft.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH] Hyperv: Trigger DHCP renew after host hibernation

On Fri, Aug 08, 2014 at 08:11:20AM +0000, Dexuan Cui wrote:
> > From: Greg KH [mailto:gregkh@...uxfoundation.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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