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xen-netfront: use skb_partial_csum_set() to simplify the codes 

use skb_partial_csum_set() to simplify the codes

Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Li RongQing 2013-06-06 14:35:18 +08:00 committed by David S. Miller
parent 2e42206948
commit 8249152c47
1 changed files with 8 additions and 12 deletions
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20
drivers/net/xen-netfront.c
View File

@ -858,7 +858,6 @@ static RING_IDX xennet_fill_frags(struct netfront_info *np,
static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
{
struct iphdr *iph;
unsigned char *th;
int err = -EPROTO;
int recalculate_partial_csum = 0;
@ -883,27 +882,27 @@ static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
goto out;
iph = (void *)skb->data;
th = skb->data + 4 * iph->ihl;
if (th >= skb_tail_pointer(skb))
goto out;
skb->csum_start = th - skb->head;
switch (iph->protocol) {
case IPPROTO_TCP:
skb->csum_offset = offsetof(struct tcphdr, check);
if (!skb_partial_csum_set(skb, 4 * iph->ihl,
offsetof(struct tcphdr, check)))
goto out;
if (recalculate_partial_csum) {
struct tcphdr *tcph = (struct tcphdr *)th;
struct tcphdr *tcph = tcp_hdr(skb);
tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
skb->len - iph->ihl*4,
IPPROTO_TCP, 0);
}
break;
case IPPROTO_UDP:
skb->csum_offset = offsetof(struct udphdr, check);
if (!skb_partial_csum_set(skb, 4 * iph->ihl,
offsetof(struct udphdr, check)))
goto out;
if (recalculate_partial_csum) {
struct udphdr *udph = (struct udphdr *)th;
struct udphdr *udph = udp_hdr(skb);
udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
skb->len - iph->ihl*4,
IPPROTO_UDP, 0);
@ -917,9 +916,6 @@ static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
goto out;
}
if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb))
goto out;
err = 0;
out: