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net: introduce skb_transport_header_was_set()

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We have skb_mac_header_was_set() helper to tell if mac_header
was set on a skb. We would like the same for transport_header.

__netif_receive_skb() doesn't reset the transport header if already
set by GRO layer.

Note that network stacks usually reset the transport header anyway,
after pulling the network header, so this change only allows
a followup patch to have more precise qdisc pkt_len computation
for GSO packets at ingress side.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2013-01-07 09:28:21 +00:00 committed by David S. Miller
parent 0edb7ede7d
commit fda55eca5a
3 changed files with 14 additions and 1 deletions
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10
include/linux/skbuff.h
View file

@ -1492,6 +1492,11 @@ static inline void skb_set_inner_network_header(struct sk_buff *skb,
skb->inner_network_header += offset; skb->inner_network_header += offset;
} }
static inline bool skb_transport_header_was_set(const struct sk_buff *skb)
{
return skb->transport_header != ~0U;
}
static inline unsigned char *skb_transport_header(const struct sk_buff *skb) static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
{ {
return skb->head + skb->transport_header; return skb->head + skb->transport_header;
@ -1580,6 +1585,11 @@ static inline void skb_set_inner_network_header(struct sk_buff *skb,
skb->inner_network_header = skb->data + offset; skb->inner_network_header = skb->data + offset;
} }
static inline bool skb_transport_header_was_set(const struct sk_buff *skb)
{
return skb->transport_header != NULL;
}
static inline unsigned char *skb_transport_header(const struct sk_buff *skb) static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
{ {
return skb->transport_header; return skb->transport_header;

3
net/core/dev.c
View file

@ -3352,7 +3352,8 @@ static int __netif_receive_skb(struct sk_buff *skb)
orig_dev = skb->dev; orig_dev = skb->dev;
skb_reset_network_header(skb); skb_reset_network_header(skb);
skb_reset_transport_header(skb); if (!skb_transport_header_was_set(skb))
skb_reset_transport_header(skb);
skb_reset_mac_len(skb); skb_reset_mac_len(skb);
pt_prev = NULL; pt_prev = NULL;

2
net/core/skbuff.c
View file

@ -260,6 +260,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
skb->end = skb->tail + size; skb->end = skb->tail + size;
#ifdef NET_SKBUFF_DATA_USES_OFFSET #ifdef NET_SKBUFF_DATA_USES_OFFSET
skb->mac_header = ~0U; skb->mac_header = ~0U;
skb->transport_header = ~0U;
#endif #endif
/* make sure we initialize shinfo sequentially */ /* make sure we initialize shinfo sequentially */
@ -328,6 +329,7 @@ struct sk_buff *build_skb(void *data, unsigned int frag_size)
skb->end = skb->tail + size; skb->end = skb->tail + size;
#ifdef NET_SKBUFF_DATA_USES_OFFSET #ifdef NET_SKBUFF_DATA_USES_OFFSET
skb->mac_header = ~0U; skb->mac_header = ~0U;
skb->transport_header = ~0U;
#endif #endif
/* make sure we initialize shinfo sequentially */ /* make sure we initialize shinfo sequentially */