netdev - Re: [net-next V7 PATCH] virtio-net: send gratuitous packets when needed

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Date:	Sun, 15 Apr 2012 03:20:03 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	mst@...hat.com
Cc:	jasowang@...hat.com, netdev@...r.kernel.org, rusty@...tcorp.com.au,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [net-next V7 PATCH] virtio-net: send gratuitous packets when
 needed

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Sun, 15 Apr 2012 10:12:23 +0300

> On Thu, Apr 12, 2012 at 02:43:52PM +0800, Jason Wang wrote:
>> As hypervior does not have the knowledge of guest network configuration, it's
>> better to ask guest to send gratuitous packets when needed.
>> 
>> This patch implements VIRTIO_NET_F_GUEST_ANNOUNCE feature: hypervisor would
>> notice the guest when it thinks it's time for guest to announce the link
>> presnece. Guest tests VIRTIO_NET_S_ANNOUNCE bit during config change interrupt
>> and woule send gratuitous packets through netif_notify_peers() and ack the
>> notification through ctrl vq.
>> 
>> We need to make sure the atomicy of read and ack in guest otherwise we may ack
>> more times than being notified. This is done through handling the whole config
>> change interrupt in an non-reentrant workqueue.
>> 
>> Signed-off-by: Jason Wang <jasowang@...hat.com>
> 
> Acked-by: Michael S. Tsirkin <mst@...hat.com>

Applied, thanks everyone.
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