dsa: add support for Trailer tagging format

This adds support for the Trailer switch tagging format.  This is
another tagging that doesn't explicitly mark tagged packets with a
distinct ethertype, so that we need to add a similar hack in the
receive path as for the Original DSA tagging format.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Tested-by: Byron Bradley <byron.bbradley@gmail.com>
Tested-by: Tim Ellis <tim.ellis@mac.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index dae47e7a44d8..b9d85af2dd31 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -193,6 +193,8 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
          */
         if (netdev_uses_dsa_tags(dev))
                 return htons(ETH_P_DSA);
+        if (netdev_uses_trailer_tags(dev))
+                return htons(ETH_P_TRAILER);
 
         if (ntohs(eth->h_proto) >= 1536)
                 return eth->h_proto;