usbnet: allow mini-drivers to consume L2 headers

Assume the minidriver has taken care of all L2 header parsing
if it sets skb->protocol.  This allows the minidriver to
support non-ethernet L2 headers, and even operate without
any L2 header at all.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 0744bf2..0b0ba7e 100644 (file)
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -324,7 +324,10 @@ void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
                return;
        }
 
-       skb->protocol = eth_type_trans (skb, dev->net);
+       /* only update if unset to allow minidriver rx_fixup override */
+       if (skb->protocol == 0)
+               skb->protocol = eth_type_trans (skb, dev->net);
+
        dev->net->stats.rx_packets++;
        dev->net->stats.rx_bytes += skb->len;