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virtio: net: Add freeze, restore handlers to support S4 

Remove all the vqs, disable napi and detach from the netdev on
hibernation.

Re-create vqs after restoring from a hibernated image, re-enable napi
and re-attach the netdev.  This keeps networking working across
hibernation.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Amit Shah 2011-12-22 16:58:33 +05:30 committed by Rusty Russell
parent 04486ed019
commit 0741bcb558
1 changed files with 46 additions and 0 deletions
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46
drivers/net/virtio_net.c
View File

@ -1178,6 +1178,48 @@ 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;
virtqueue_disable_cb(vi->rvq);
virtqueue_disable_cb(vi->svq);
if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ))
virtqueue_disable_cb(vi->cvq);
netif_device_detach(vi->dev);
cancel_delayed_work_sync(&vi->refill);
if (netif_running(vi->dev))
napi_disable(&vi->napi);
remove_vq_common(vi);
return 0;
}
static int virtnet_restore(struct virtio_device *vdev)
{
struct virtnet_info *vi = vdev->priv;
int err;
err = init_vqs(vi);
if (err)
return err;
if (netif_running(vi->dev))
virtnet_napi_enable(vi);
netif_device_attach(vi->dev);
if (!try_fill_recv(vi, GFP_KERNEL))
queue_delayed_work(system_nrt_wq, &vi->refill, 0);
return 0;
}
#endif
static struct virtio_device_id id_table[] = {
{ VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
{ 0 },
@ -1202,6 +1244,10 @@ 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)