[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, 5 insertions, 3 deletions

diff --git a/drivers/net/netxen/netxen_nic_hw.c b/drivers/net/netxen/netxen_nic_hw.c
index 625e11ed6aae..b2f5032937e3 100644
--- a/drivers/net/netxen/netxen_nic_hw.c
+++ b/drivers/net/netxen/netxen_nic_hw.c
@@ -35,6 +35,8 @@
 #include "netxen_nic_hw.h"
 #include "netxen_nic_phan_reg.h"
 
+#include <net/ip.h>
+
 /*  PCI Windowing for DDR regions.  */
 
 #define ADDR_IN_RANGE(addr, low, high)  \
@@ -371,9 +373,9 @@ void netxen_tso_check(struct netxen_adapter *adapter,
                       struct cmd_desc_type0 *desc, struct sk_buff *skb)
 {
         if (desc->mss) {
-                desc->total_hdr_length = sizeof(struct ethhdr) +
-                    ((skb->nh.iph)->ihl * sizeof(u32)) +
-                    ((skb->h.th)->doff * sizeof(u32));
+                desc->total_hdr_length = (sizeof(struct ethhdr) +
+                                          ip_hdrlen(skb) +
+                                          skb->h.th->doff * 4);
                 netxen_set_cmd_desc_opcode(desc, TX_TCP_LSO);
         } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
                 if (skb->nh.iph->protocol == IPPROTO_TCP) {