[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>

7 files changed, 43 insertions, 50 deletions

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 6cdb97365e47..b7558ec81ed5 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -29,15 +29,19 @@
 #include <linux/random.h>
 
 #ifdef __KERNEL__
-extern int              eth_header(struct sk_buff *skb, struct net_device *dev,
-                                   unsigned short type, void *daddr,
-                                   void *saddr, unsigned len);
-extern int              eth_rebuild_header(struct sk_buff *skb);
 extern __be16           eth_type_trans(struct sk_buff *skb, struct net_device *dev);
-extern void             eth_header_cache_update(struct hh_cache *hh, struct net_device *dev,
-                                                unsigned char * haddr);
-extern int              eth_header_cache(struct neighbour *neigh,
-                                         struct hh_cache *hh);
+extern const struct header_ops eth_header_ops;
+
+extern int eth_header(struct sk_buff *skb, struct net_device *dev,
+                      unsigned short type,
+                      const void *daddr, const void *saddr, unsigned len);
+extern int eth_rebuild_header(struct sk_buff *skb);
+extern int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
+extern int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh);
+extern void eth_header_cache_update(struct hh_cache *hh,
+                                    const struct net_device *dev,
+                                    const unsigned char *haddr);
+
 
 extern struct net_device *alloc_etherdev_mq(int sizeof_priv, unsigned int queue_count);
 #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)
diff --git a/include/linux/if_ether.h b/include/linux/if_ether.h
index 0e791e2c0c5a..5f9297793661 100644
--- a/include/linux/if_ether.h
+++ b/include/linux/if_ether.h
@@ -117,6 +117,8 @@ static inline struct ethhdr *eth_hdr(const struct sk_buff *skb)
         return (struct ethhdr *)skb_mac_header(skb);
 }
 
+int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
+
 #ifdef CONFIG_SYSCTL
 extern struct ctl_table ether_table[];
 #endif
diff --git a/include/linux/if_shaper.h b/include/linux/if_shaper.h
index 51574743aa1b..3b1b7ba19825 100644
--- a/include/linux/if_shaper.h
+++ b/include/linux/if_shaper.h
@@ -25,17 +25,6 @@ struct shaper
                                    an empty queue */
         spinlock_t lock;
         struct net_device *dev;
-        int  (*hard_start_xmit) (struct sk_buff *skb,
-                struct net_device *dev);
-        int  (*hard_header) (struct sk_buff *skb,
-                struct net_device *dev,
-                unsigned short type,
-                void *daddr,
-                void *saddr,
-                unsigned len);
-        int  (*rebuild_header)(struct sk_buff *skb);
-        int (*hard_header_cache)(struct neighbour *neigh, struct hh_cache *hh);
-        void (*header_cache_update)(struct hh_cache *hh, struct net_device *dev, unsigned char *  haddr);
         struct net_device_stats* (*get_stats)(struct net_device *dev);
         struct timer_list timer;
 };
diff --git a/include/linux/isdn.h b/include/linux/isdn.h
index 3c7875b7ab5b..a6fb366748bb 100644
--- a/include/linux/isdn.h
+++ b/include/linux/isdn.h
@@ -353,13 +353,6 @@ typedef struct isdn_net_local_s {
                                        /* a particular channel (including  */
                                        /* the frame_cnt                    */
 
-  int                    (*org_hhc)(
-                                    struct neighbour *neigh,
-                                    struct hh_cache *hh);
-                                       /* Ptr to orig. header_cache_update */
-  void                   (*org_hcu)(struct hh_cache *,
-                                    struct net_device *,
-                                    unsigned char *);
   int  pppbind;                        /* ippp device for bindings         */
   int                                   dialtimeout;    /* How long shall we try on dialing? (jiffies) */
   int                                   dialwait;               /* How long shall we wait after failed attempt? (jiffies) */
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index aae9ec367f5d..91cd3f3db507 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -250,6 +250,19 @@ struct hh_cache
 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
         ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 
+struct header_ops {
+        int     (*create) (struct sk_buff *skb, struct net_device *dev,
+                           unsigned short type, const void *daddr,
+                           const void *saddr, unsigned len);
+        int     (*parse)(const struct sk_buff *skb, unsigned char *haddr);
+        int     (*rebuild)(struct sk_buff *skb);
+#define HAVE_HEADER_CACHE
+        int     (*cache)(const struct neighbour *neigh, struct hh_cache *hh);
+        void    (*cache_update)(struct hh_cache *hh,
+                                const struct net_device *dev,
+                                const unsigned char *haddr);
+};
+
 /* These flag bits are private to the generic network queueing
  * layer, they may not be explicitly referenced by any other
  * code.
@@ -492,6 +505,9 @@ struct net_device
 #endif
         const struct ethtool_ops *ethtool_ops;
 
+        /* Hardware header description */
+        const struct header_ops *header_ops;
+
         /*
          * This marks the end of the "visible" part of the structure. All
          * fields hereafter are internal to the system, and may change at
@@ -615,13 +631,6 @@ struct net_device
         int                     (*open)(struct net_device *dev);
         int                     (*stop)(struct net_device *dev);
 #define HAVE_NETDEV_POLL
-        int                     (*hard_header) (struct sk_buff *skb,
-                                                struct net_device *dev,
-                                                unsigned short type,
-                                                void *daddr,
-                                                void *saddr,
-                                                unsigned len);
-        int                     (*rebuild_header)(struct sk_buff *skb);
 #define HAVE_CHANGE_RX_FLAGS
         void                    (*change_rx_flags)(struct net_device *dev,
                                                    int flags);
@@ -638,12 +647,6 @@ struct net_device
 #define HAVE_SET_CONFIG
         int                     (*set_config)(struct net_device *dev,
                                               struct ifmap *map);
-#define HAVE_HEADER_CACHE
-        int                     (*hard_header_cache)(struct neighbour *neigh,
-                                                     struct hh_cache *hh);
-        void                    (*header_cache_update)(struct hh_cache *hh,
-                                                       struct net_device *dev,
-                                                       unsigned char *  haddr);
 #define HAVE_CHANGE_MTU
         int                     (*change_mtu)(struct net_device *dev, int new_mtu);
 
@@ -657,8 +660,6 @@ struct net_device
         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
                                                     unsigned short vid);
 
-        int                     (*hard_header_parse)(const struct sk_buff *skb,
-                                                     unsigned char *haddr);
         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 #ifdef CONFIG_NETPOLL
         struct netpoll_info     *npinfo;
@@ -802,11 +803,13 @@ extern int		netpoll_trap(void);
 
 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
                                   unsigned short type,
-                                  void *daddr, void *saddr, unsigned len)
+                                  const void *daddr, const void *saddr,
+                                  unsigned len)
 {
-        if (!dev->hard_header)
+        if (!dev->header_ops)
                 return 0;
-        return dev->hard_header(skb, dev, type, daddr, saddr, len);
+
+        return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
 }
 
 static inline int dev_parse_header(const struct sk_buff *skb,
@@ -814,9 +817,9 @@ static inline int dev_parse_header(const struct sk_buff *skb,
 {
         const struct net_device *dev = skb->dev;
 
-        if (!dev->hard_header_parse)
+        if (!dev->header_ops->parse)
                 return 0;
-        return dev->hard_header_parse(skb, haddr);
+        return dev->header_ops->parse(skb, haddr);
 }
 
 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
diff --git a/include/net/ax25.h b/include/net/ax25.h
index 99a4e364c74a..4e3cd93f81fc 100644
--- a/include/net/ax25.h
+++ b/include/net/ax25.h
@@ -363,8 +363,11 @@ extern int  ax25_rx_iframe(ax25_cb *, struct sk_buff *);
 extern int  ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
 
 /* ax25_ip.c */
-extern int  ax25_hard_header(struct sk_buff *, struct net_device *, unsigned short, void *, void *, unsigned int);
+extern int ax25_hard_header(struct sk_buff *, struct net_device *,
+                            unsigned short, const void *,
+                            const void *, unsigned int);
 extern int  ax25_rebuild_header(struct sk_buff *);
+extern const struct header_ops ax25_header_ops;
 
 /* ax25_out.c */
 extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
index 9e22526e80e7..ab61809a9616 100644
--- a/include/net/pkt_sched.h
+++ b/include/net/pkt_sched.h
@@ -97,10 +97,9 @@ extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp,
 /* Calculate maximal size of packet seen by hard_start_xmit
    routine of this device.
  */
-static inline unsigned psched_mtu(struct net_device *dev)
+static inline unsigned psched_mtu(const struct net_device *dev)
 {
-        unsigned mtu = dev->mtu;
-        return dev->hard_header ? mtu + dev->hard_header_len : mtu;
+        return dev->mtu + dev->hard_header_len;
 }
 
 #endif