[RFC experiment 1/2] usbnet: allow mini-drivers to consume L2 headers

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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@xxxxxxx>
---
 drivers/net/usb/usbnet.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index fae0fbd..b9ce226 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -231,7 +231,10 @@ 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;
 
-- 
1.7.9

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