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

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Message-Id: <20120413.133804.1504347944886702242.davem@davemloft.net>
Date:	Fri, 13 Apr 2012 13:38:04 -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: [net-next V7 PATCH] virtio-net: send gratuitous packets when
 needed

From: Jason Wang <jasowang@...hat.com>
Date: Thu, 12 Apr 2012 14:43:52 +0800

> 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>

Michael, Rusty, et al.?
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