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net: Add skb_headers_offset_update helper function.

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This function will be used in next VXLAN_GSO patch. This patch does
not change any functionality.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar 2013-03-07 13:21:40 +00:00 committed by David S. Miller
parent ee579677c2
commit f5b1729443
1 changed files with 14 additions and 20 deletions
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34
net/core/skbuff.c
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@ -867,6 +867,17 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
}
EXPORT_SYMBOL(skb_clone);
static void skb_headers_offset_update(struct sk_buff *skb, int off)
{
/* {transport,network,mac}_header and tail are relative to skb->head */
skb->transport_header += off;
skb->network_header += off;
if (skb_mac_header_was_set(skb))
skb->mac_header += off;
skb->inner_transport_header += off;
skb->inner_network_header += off;
}
static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
{
#ifndef NET_SKBUFF_DATA_USES_OFFSET
@ -879,13 +890,7 @@ static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
__copy_skb_header(new, old);
#ifndef NET_SKBUFF_DATA_USES_OFFSET
/* {transport,network,mac}_header are relative to skb->head */
new->transport_header += offset;
new->network_header += offset;
if (skb_mac_header_was_set(new))
new->mac_header += offset;
new->inner_transport_header += offset;
new->inner_network_header += offset;
skb_headers_offset_update(new, offset);
#endif
skb_shinfo(new)->gso_size = skb_shinfo(old)->gso_size;
skb_shinfo(new)->gso_segs = skb_shinfo(old)->gso_segs;
@ -1077,14 +1082,8 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
#else
skb->end = skb->head + size;
#endif
/* {transport,network,mac}_header and tail are relative to skb->head */
skb->tail += off;
skb->transport_header += off;
skb->network_header += off;
if (skb_mac_header_was_set(skb))
skb->mac_header += off;
skb->inner_transport_header += off;
skb->inner_network_header += off;
skb_headers_offset_update(skb, off);
/* Only adjust this if it actually is csum_start rather than csum */
if (skb->ip_summed == CHECKSUM_PARTIAL)
skb->csum_start += nhead;
@ -1180,12 +1179,7 @@ struct sk_buff *skb_copy_expand(const struct sk_buff *skb,
if (n->ip_summed == CHECKSUM_PARTIAL)
n->csum_start += off;
#ifdef NET_SKBUFF_DATA_USES_OFFSET
n->transport_header += off;
n->network_header += off;
if (skb_mac_header_was_set(skb))
n->mac_header += off;
n->inner_transport_header += off;
n->inner_network_header += off;
skb_headers_offset_update(n, off);
#endif
return n;