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authorAmit Shah <amit.shah@redhat.com>2011-12-22 11:28:33 (GMT)
committerRusty Russell <rusty@rustcorp.com.au>2012-01-12 05:14:46 (GMT)
commit0741bcb5584f9e2390ae6261573c4de8314999f2 (patch)
treed52abfa39e08dbdda0bee35d85a72a8060391a16 /drivers
parent04486ed019d249249c00546704af12498a432c15 (diff)
downloadlinux-0741bcb5584f9e2390ae6261573c4de8314999f2.tar.xz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/virtio_net.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 59109c1..4880aa8 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -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)