[SK_BUFF]: Introduce skb_transport_offset()

For the quite common 'skb->h.raw - skb->data' sequence.

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

2 files changed, 8 insertions, 3 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 7c1f1756e482..64c3c1687e49 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -962,6 +962,11 @@ static inline void skb_reset_transport_header(struct sk_buff *skb)
         skb->h.raw = skb->data;
 }
 
+static inline int skb_transport_offset(const struct sk_buff *skb)
+{
+        return skb->h.raw - skb->data;
+}
+
 static inline unsigned char *skb_network_header(const struct sk_buff *skb)
 {
         return skb->nh.raw;
diff --git a/include/net/udplite.h b/include/net/udplite.h
index d99df75fe54c..765032036657 100644
--- a/include/net/udplite.h
+++ b/include/net/udplite.h
@@ -101,14 +101,14 @@ static inline int udplite_sender_cscov(struct udp_sock *up, struct udphdr *uh)
 
 static inline __wsum udplite_csum_outgoing(struct sock *sk, struct sk_buff *skb)
 {
-        int off, len, cscov = udplite_sender_cscov(udp_sk(sk), skb->h.uh);
+        int cscov = udplite_sender_cscov(udp_sk(sk), skb->h.uh);
         __wsum csum = 0;
 
         skb->ip_summed = CHECKSUM_NONE;     /* no HW support for checksumming */
 
         skb_queue_walk(&sk->sk_write_queue, skb) {
-                off = skb->h.raw - skb->data;
-                len = skb->len - off;
+                const int off = skb_transport_offset(skb);
+                const int len = skb->len - off;
 
                 csum = skb_checksum(skb, off, (cscov > len)? len : cscov, csum);