Re: [net-next V7 PATCH] virtio-net: send gratuitous packets whenneeded

[David Miller]

From: Jason Wang <jasowang@xxxxxxxxxx>
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@xxxxxxxxxx>

Michael, Rusty, et al.?
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