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etherdev: Fix sparse error, make test usable by other functions

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This change does two things.  First it fixes a sparse error for the fact
that the __be16 degrades to an integer.  Since that is actually what I am
kind of doing I am simply working around that by forcing both sides of the
comparison to u16.

Also I realized on some compilers I was generating another instruction for
big endian systems such as PowerPC since it was masking the value before
doing the comparison.  So to resolve that I have simply pulled the mask out
and wrapped it in an #ifndef __BIG_ENDIAN.

Lastly I pulled this all out into its own function.  I notices there are
similar checks in a number of other places so this function can be reused
there to help reduce overhead in these paths as well.

Signed-off-by: Alexander Duyck <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Alexander Duyck 2015-05-04 14:33:48 -07:00 • committed by David S. Miller
commit 2c7a88c252
2 changed files with 19 additions and 1 deletions
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2
net/ethernet/eth.c
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@ -179,7 +179,7 @@ __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((eth->h_proto & htons(0xFF00)) >= htons(ETH_P_802_3_MIN)))
if (likely(eth_proto_is_802_3(eth->h_proto)))
return eth->h_proto;
/*