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    Subject[PATCH 4/4] virtio: Enable netpoll interface for netconsole logging
    Date
    From: "Amit Shah" <amitshah@gmx.net>

    Add a new poll_controller handler that the netpoll interface needs.

    This enables netconsole logging from a kvm guest over the virtio
    net interface.

    Signed-off-by: Amit Shah <amitshah@gmx.net>
    Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
    ---
    drivers/net/virtio_net.c | 12 ++++++++++++
    1 file changed, 12 insertions(+)

    diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
    --- a/drivers/net/virtio_net.c
    +++ b/drivers/net/virtio_net.c
    @@ -294,6 +294,15 @@ again:
    return 0;
    }

    +#ifdef CONFIG_NET_POLL_CONTROLLER
    +static void virtnet_netpoll(struct net_device *dev)
    +{
    + struct virtnet_info *vi = netdev_priv(dev);
    +
    + napi_schedule(&vi->napi);
    +}
    +#endif
    +
    static int virtnet_open(struct net_device *dev)
    {
    struct virtnet_info *vi = netdev_priv(dev);
    @@ -336,6 +345,9 @@ static int virtnet_probe(struct virtio_d
    dev->stop = virtnet_close;
    dev->hard_start_xmit = start_xmit;
    dev->features = NETIF_F_HIGHDMA;
    +#ifdef CONFIG_NET_POLL_CONTROLLER
    + dev->poll_controller = virtnet_netpoll;
    +#endif
    SET_NETDEV_DEV(dev, &vdev->dev);

    /* Do we support "hardware" checksums? */

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