netdev - Re: [V5 PATCH] virtio-net: send gratuitous packets when needed

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Date:	Tue, 27 Mar 2012 22:31:12 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	jasowang@...hat.com
Cc:	netdev@...r.kernel.org, rusty@...tcorp.com.au,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, mst@...hat.com
Subject: Re: [V5 PATCH] virtio-net: send gratuitous packets when needed

From: Jason Wang <jasowang@...hat.com>
Date: Fri, 16 Mar 2012 17:01:01 +0800

> As hypervior does not have the knowledge of guest network configuration, it's
> better to ask guest to send gratuitous packets when needed.
> 
> Guest tests VIRTIO_NET_S_ANNOUNCE bit during config change interrupt and when it
> is set, a workqueue is scheduled to send gratuitous packet through
> NETDEV_NOTIFY_PEERS. This feature is negotiated through bit
> VIRTIO_NET_F_GUEST_ANNOUNCE.
> 
> Changes from v4:
> - typos
> - handle workqueue unconditionally
> - move VIRTIO_NET_S_ANNOUNCE to bit 8 to separate rw bits from ro bits
> 
> Changes from v3:
> - cancel the workqueue during freeze
> 
> Changes from v2:
> - fix the race between unregister_dev() and workqueue
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>

What's happening with this patch?
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