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authorAlexander Duyck <alexander.h.duyck@redhat.com>2015-04-30 21:53:48 (GMT)
committerDavid S. Miller <davem@davemloft.net>2015-05-04 02:30:36 (GMT)
commit849b920e17a2b1e9a3c912ca960dc667d27985e8 (patch)
tree022462df37208a5eba25b4ad59a2c18b846aa5c3
parent82a584b7cd366511a22e37675b029cf2fb58e291 (diff)
etherdev: Avoid unnecessary byte swap in check for Ethertype
This change takes advantage of the fact that ETH_P_802_3_MIN is aligned to 512 so as a result we can actually ignore the lower 8b when comparing the Ethertype to ETH_P_802_3_MIN. This allows us to avoid a byte swap by simply masking the value and comparing it to the byte swapped value for ETH_P_802_3_MIN. Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ethernet/eth.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index f3bad41..6006931 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -178,7 +178,7 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
if (unlikely(netdev_uses_dsa(dev)))
return htons(ETH_P_XDSA);
- if (likely(ntohs(eth->h_proto) >= ETH_P_802_3_MIN))
+ if (likely((eth->h_proto & htons(0xFF00)) >= htons(ETH_P_802_3_MIN)))
return eth->h_proto;
/*

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