net/ethernet: Add parse_protocol header_ops support

The previous commit introduced parse_protocol callback which should
extract the protocol number from the L2 header. Make all Ethernet
devices support it.

Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 2c0af7b..e2f3b21 100644 (file)
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -44,6 +44,7 @@ int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh,
                     __be16 type);
 void eth_header_cache_update(struct hh_cache *hh, const struct net_device *dev,
                             const unsigned char *haddr);
+__be16 eth_header_parse_protocol(const struct sk_buff *skb);
 int eth_prepare_mac_addr_change(struct net_device *dev, void *p);
 void eth_commit_mac_addr_change(struct net_device *dev, void *p);
 int eth_mac_addr(struct net_device *dev, void *p);

diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 4c52011..f7a3d7a 100644 (file)
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -265,6 +265,18 @@ void eth_header_cache_update(struct hh_cache *hh,
 EXPORT_SYMBOL(eth_header_cache_update);
 
 /**
+ * eth_header_parser_protocol - extract protocol from L2 header
+ * @skb: packet to extract protocol from
+ */
+__be16 eth_header_parse_protocol(const struct sk_buff *skb)
+{
+       const struct ethhdr *eth = eth_hdr(skb);
+
+       return eth->h_proto;
+}
+EXPORT_SYMBOL(eth_header_parse_protocol);
+
+/**
  * eth_prepare_mac_addr_change - prepare for mac change
  * @dev: network device
  * @p: socket address
@@ -346,6 +358,7 @@ const struct header_ops eth_header_ops ____cacheline_aligned = {
        .parse          = eth_header_parse,
        .cache          = eth_header_cache,
        .cache_update   = eth_header_cache_update,
+       .parse_protocol = eth_header_parse_protocol,
 };
 
 /**