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.du...@redhat.com>
---
net/ethernet/eth.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index f3bad41d725f..60069318d5d1 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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