[NET]: Move hardware header operations out of netdevice.

Since hardware header operations are part of the protocol class
not the device instance, make them into a separate object and
save memory.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 7 deletions

diff --git a/drivers/net/arcnet/arcnet.c b/drivers/net/arcnet/arcnet.c
index 681e20b8466f..c59c8067de99 100644
--- a/drivers/net/arcnet/arcnet.c
+++ b/drivers/net/arcnet/arcnet.c
@@ -102,8 +102,8 @@ static int arcnet_close(struct net_device *dev);
 static int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev);
 static void arcnet_timeout(struct net_device *dev);
 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
-                         unsigned short type, void *daddr, void *saddr,
-                         unsigned len);
+                         unsigned short type, const void *daddr,
+                         const void *saddr, unsigned len);
 static int arcnet_rebuild_header(struct sk_buff *skb);
 static struct net_device_stats *arcnet_get_stats(struct net_device *dev);
 static int go_tx(struct net_device *dev);
@@ -317,11 +317,17 @@ static int choose_mtu(void)
         return mtu == 65535 ? XMTU : mtu;
 }
 
+static const struct header_ops arcnet_header_ops = {
+        .create = arcnet_header,
+        .rebuild = arcnet_rebuild_header,
+};
+
 
 /* Setup a struct device for ARCnet. */
 static void arcdev_setup(struct net_device *dev)
 {
         dev->type = ARPHRD_ARCNET;
+        dev->header_ops = &arcnet_header_ops;
         dev->hard_header_len = sizeof(struct archdr);
         dev->mtu = choose_mtu();
 
@@ -342,8 +348,6 @@ static void arcdev_setup(struct net_device *dev)
         dev->hard_start_xmit = arcnet_send_packet;
         dev->tx_timeout = arcnet_timeout;
         dev->get_stats = arcnet_get_stats;
-        dev->hard_header = arcnet_header;
-        dev->rebuild_header = arcnet_rebuild_header;
 }
 
 struct net_device *alloc_arcdev(char *name)
@@ -488,10 +492,10 @@ static int arcnet_close(struct net_device *dev)
 
 
 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
-                         unsigned short type, void *daddr, void *saddr,
-                         unsigned len)
+                         unsigned short type, const void *daddr,
+                         const void *saddr, unsigned len)
 {
-        struct arcnet_local *lp = dev->priv;
+        const struct arcnet_local *lp = netdev_priv(dev);
         uint8_t _daddr, proto_num;
         struct ArcProto *proto;