enable virtio_net to return bus_info in ethtool -i consistent with emulated NICs

Add a new .bus_name to virtio_config_ops then modify virtio_net to
call through to it in an ethtool .get_drvinfo routine to report
bus_info in ethtool -i output which is consistent with other
emulated NICs and the output of lspci.

Signed-off-by: Rick Jones <rick.jones2@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index add4790b21fe..63f98d0a8efa 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -100,6 +100,10 @@
  *      vdev: the virtio_device
  *      This gives the final feature bits for the device: it can change
  *      the dev->feature bits if it wants.
+ * @bus_name: return the bus name associated with the device
+ *      vdev: the virtio_device
+ *      This returns a pointer to the bus name a la pci_name from which
+ *      the caller can then copy.
  */
 typedef void vq_callback_t(struct virtqueue *);
 struct virtio_config_ops {
@@ -117,6 +121,7 @@ struct virtio_config_ops {
         void (*del_vqs)(struct virtio_device *);
         u32 (*get_features)(struct virtio_device *vdev);
         void (*finalize_features)(struct virtio_device *vdev);
+        const char *(*bus_name)(struct virtio_device *vdev);
 };
 
 /* If driver didn't advertise the feature, it will never appear. */
@@ -182,5 +187,14 @@ struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev,
                 return ERR_PTR(err);
         return vq;
 }
+
+static inline
+const char *virtio_bus_name(struct virtio_device *vdev)
+{
+        if (!vdev->config->bus_name)
+                return "virtio";
+        return vdev->config->bus_name(vdev);
+}
+
 #endif /* __KERNEL__ */
 #endif /* _LINUX_VIRTIO_CONFIG_H */