[SK_BUFF]: Introduce skb_reset_network_header(skb)

For the common, open coded 'skb->nh.raw = skb->data' operation, so that we can
later turn skb->nh.raw into a offset, reducing the size of struct sk_buff in
64bit land while possibly keeping it as a pointer on 32bit.

This one touches just the most simple case, next will handle the slightly more
"complex" cases.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 6 insertions, 1 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index dff81af454b7..6440c78fe625 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -960,6 +960,11 @@ static inline void skb_reserve(struct sk_buff *skb, int len)
         skb->tail += len;
 }
 
+static inline void skb_reset_network_header(struct sk_buff *skb)
+{
+        skb->nh.raw = skb->data;
+}
+
 static inline unsigned char *skb_mac_header(const struct sk_buff *skb)
 {
         return skb->mac.raw;
diff --git a/include/net/llc_pdu.h b/include/net/llc_pdu.h
index 4e620992c806..778f75a40b4d 100644
--- a/include/net/llc_pdu.h
+++ b/include/net/llc_pdu.h
@@ -235,7 +235,7 @@ static inline void llc_pdu_header_init(struct sk_buff *skb, u8 type,
         struct llc_pdu_un *pdu;
 
         skb_push(skb, hlen);
-        skb->nh.raw = skb->data;
+        skb_reset_network_header(skb);
         pdu = llc_pdu_un_hdr(skb);
         pdu->dsap = dsap;
         pdu->ssap = ssap;