[IP]: Introduce ip_hdrlen()

For the common sequence "skb->nh.iph->ihl * 4", removing a good number of open
coded skb->nh.iph uses, now to go after the rest...

Just out of curiosity, here are the idioms found to get the same result:

skb->nh.iph->ihl << 2
skb->nh.iph->ihl<<2
skb->nh.iph->ihl * 4
skb->nh.iph->ihl*4
(skb->nh.iph)->ihl * sizeof(u32)

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

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index ac36152c68bf..51e994f26a84 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -32,6 +32,7 @@
 #include <linux/ethtool.h>
 #include <linux/pci.h>
 #include <linux/ip.h>
+#include <net/ip.h>
 #include <linux/tcp.h>
 #include <linux/in.h>
 #include <linux/delay.h>
@@ -1392,7 +1393,7 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)
         mss = skb_shinfo(skb)->gso_size;
         if (mss != 0) {
                 mss += ((skb->h.th->doff - 5) * 4);     /* TCP options */
-                mss += (skb->nh.iph->ihl * 4) + sizeof(struct tcphdr);
+                mss += ip_hdrlen(skb) + sizeof(struct tcphdr);
                 mss += ETH_HLEN;
 
                 if (mss != sky2->tx_last_mss) {