On Thu, Jul 28, 2011 at 08:05:13PM +0530, Amit Shah wrote:
> Remove all the vqs on hibernation and re-create them after restoring
> from a hibernated image. This keeps networking working across
> hibernation.
>
> Signed-off-by: Amit Shah <[email protected]>
> ---
> drivers/net/virtio_net.c | 51
> ++++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 51 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 0c7321c..c9aaa8f 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1117,6 +1117,53 @@ static void __devexit virtnet_remove(struct
> virtio_device *vdev)
> free_netdev(vi->dev);
> }
>
> +#ifdef CONFIG_PM
> +static int virtnet_freeze(struct virtio_device *vdev)
> +{
> + struct virtnet_info *vi = vdev->priv;
> +
> + cancel_delayed_work_sync(&vi->refill);
> +
> + /* Free unused buffers in both send and recv, if any. */
> + free_unused_bufs(vi);
> +
> + vdev->config->del_vqs(vi->vdev);
> +
> + while (vi->pages)
> + __free_pages(get_a_page(vi, GFP_KERNEL), 0);
> +
> + return 0;
> +}
> +
> +static int virtnet_restore(struct virtio_device *vdev)
> +{
> + struct virtnet_info *vi = vdev->priv;
> + struct virtqueue *vqs[3];
> + vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
> + const char *names[] = { "input", "output", "control" };
> + int nvqs, err;
> +
> + /* We expect two virtqueues, receive then send,
> + * and optionally control. */
> + nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
> +
> + err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names);
> + if (err)
> + return err;
> +
> + vi->rvq = vqs[0];
> + vi->svq = vqs[1];
> +
> + if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
> + vi->cvq = vqs[2];
> + }
> +
> + /* Last of all, set up some receive buffers. */
> + try_fill_recv(vi, GFP_KERNEL);
should probably update carrier status too.
> + return 0;
> +}
> +#endif
> +
> static struct virtio_device_id id_table[] = {
> { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
> { 0 },
> @@ -1141,6 +1188,10 @@ static struct virtio_driver virtio_net_driver = {
> .probe = virtnet_probe,
> .remove = __devexit_p(virtnet_remove),
> .config_changed = virtnet_config_changed,
> +#ifdef CONFIG_PM
> + .freeze = virtnet_freeze,
> + .restore = virtnet_restore,
> +#endif
> };
>
> static int __init init(void)
> --
> 1.7.6
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