[NET]: Remove HIPPI private from skbuff.h

This removes the private element from skbuff, that is only used by
HIPPI. Instead it uses skb->cb[] to hold the additional data that is
needed in the output path from hard_header to device driver.

PS: The only qdisc that might potentially corrupt this cb[] is if
netem was used over HIPPI. I will take care of that by fixing netem
to use skb->stamp. I don't expect many users of netem over HIPPI

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

Author: Stephen Hemminger

drivers/net/rrunner.c

@@ -1429,6 +1429,7 @@ static int rr_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct rr_private *rrpriv = netdev_priv(dev);
 	struct rr_regs __iomem *regs = rrpriv->regs;
+	struct hippi_cb *hcb = (struct hippi_cb *) skb->cb;
 	struct ring_ctrl *txctrl;
 	unsigned long flags;
 	u32 index, len = skb->len;
@@ -1460,7 +1461,7 @@ static int rr_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	ifield = (u32 *)skb_push(skb, 8);
 
 	ifield[0] = 0;
-	ifield[1] = skb->private.ifield;
+	ifield[1] = hcb->ifield;
 
 	/*
 	 * We don't need the lock before we are actually going to start

include/linux/hippidevice.h

@@ -26,6 +26,11 @@
 #include <linux/if_hippi.h>
 
 #ifdef __KERNEL__
+
+struct hippi_cb {
+	__u32	ifield;
+};
+
 extern unsigned short hippi_type_trans(struct sk_buff *skb,
 				       struct net_device *dev);
 

include/linux/skbuff.h

@@ -193,7 +193,6 @@ struct skb_shared_info {
  *	@nfct: Associated connection, if any
  *	@nfctinfo: Relationship of this skb to the connection
  *	@nf_bridge: Saved data about a bridged frame - see br_netfilter.c
- *      @private: Data which is private to the HIPPI implementation
  *	@tc_index: Traffic control index
  *	@tc_verd: traffic control verdict
  */
@@ -265,11 +264,6 @@ struct sk_buff {
 	struct nf_bridge_info	*nf_bridge;
 #endif
 #endif /* CONFIG_NETFILTER */
-#if defined(CONFIG_HIPPI)
-	union {
-		__u32		ifield;
-	} private;
-#endif
 #ifdef CONFIG_NET_SCHED
        __u32			tc_index;        /* traffic control index */
 #ifdef CONFIG_NET_CLS_ACT

net/802/hippi.c

@@ -51,6 +51,7 @@ static int hippi_header(struct sk_buff *skb, struct net_device *dev,
 			unsigned len)
 {
 	struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
+	struct hippi_cb *hcb = (struct hippi_cb *) skb->cb;
 
 	if (!len){
 		len = skb->len - HIPPI_HLEN;
@@ -84,9 +85,10 @@ static int hippi_header(struct sk_buff *skb, struct net_device *dev,
 	if (daddr)
 	{
 		memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
-		memcpy(&skb->private.ifield, daddr + 2, 4);
+		memcpy(&hcb->ifield, daddr + 2, 4);
 		return HIPPI_HLEN;
 	}
+	hcb->ifield = 0;
 	return -((int)HIPPI_HLEN);
 }
 

net/core/skbuff.c

@@ -365,9 +365,6 @@ struct sk_buff *skb_clone(struct sk_buff *skb, unsigned int __nocast gfp_mask)
 	nf_bridge_get(skb->nf_bridge);
 #endif
 #endif /*CONFIG_NETFILTER*/
-#if defined(CONFIG_HIPPI)
-	C(private);
-#endif
 #ifdef CONFIG_NET_SCHED
 	C(tc_index);
 #ifdef CONFIG_NET_CLS_ACT