etherdev: Use skb->data to retrieve Ethernet header instead of eth_hdr

Avoid recomputing the Ethernet header location and instead just use the
pointer provided by skb->data.  The problem with using eth_hdr is that the
compiler wasn't smart enough to realize that skb->head + skb->mac_header
was the same thing as skb->data before it added ETH_HLEN.  By just caching
it off before calling skb_pull_inline we can avoid a few unnecessary
instructions.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 21c211e9fd5ac87e11910a959cae6ec59fd98c4b..314e4c5a5a5e0982e29b81c91394477bc58fd582 100644 (file)
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -156,8 +156,9 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
 
        skb->dev = dev;
        skb_reset_mac_header(skb);
+
+       eth = (struct ethhdr *)skb->data;
        skb_pull_inline(skb, ETH_HLEN);
-       eth = eth_hdr(skb);
 
        if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) {
                if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))