[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, 4 insertions, 2 deletions

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 5b24c65b13c6..d8248198bcd7 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -253,7 +253,7 @@ static int arp_constructor(struct neighbour *neigh)
         neigh->parms = neigh_parms_clone(parms);
         rcu_read_unlock();
 
-        if (dev->hard_header == NULL) {
+        if (!dev->header_ops) {
                 neigh->nud_state = NUD_NOARP;
                 neigh->ops = &arp_direct_ops;
                 neigh->output = neigh->ops->queue_xmit;
@@ -310,10 +310,12 @@ static int arp_constructor(struct neighbour *neigh)
                         neigh->nud_state = NUD_NOARP;
                         memcpy(neigh->ha, dev->broadcast, dev->addr_len);
                 }
-                if (dev->hard_header_cache)
+
+                if (dev->header_ops->cache)
                         neigh->ops = &arp_hh_ops;
                 else
                         neigh->ops = &arp_generic_ops;
+
                 if (neigh->nud_state&NUD_VALID)
                         neigh->output = neigh->ops->connected_output;
                 else