Add ethtool -g support to virtio_net

Add support for reporting ring sizes via ethtool -g to the virtio_net
driver.

Signed-off-by: Rick Jones <rick.jones2@hp.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 765ab9ac9d1..91039ab1672 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -877,8 +877,21 @@ static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
                 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
 }
 
+static void virtnet_get_ringparam(struct net_device *dev,
+                                struct ethtool_ringparam *ring)
+{
+        struct virtnet_info *vi = netdev_priv(dev);
+
+        ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq);
+        ring->tx_max_pending = virtqueue_get_vring_size(vi->svq);
+        ring->rx_pending = ring->rx_max_pending;
+        ring->tx_pending = ring->tx_max_pending;
+
+}
+
 static const struct ethtool_ops virtnet_ethtool_ops = {
         .get_link = ethtool_op_get_link,
+        .get_ringparam = virtnet_get_ringparam,
 };
 
 #define MIN_MTU 68