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Commit ee039871 authored by David S. Miller's avatar David S. Miller
Browse files

skbuff: Add frag list abstraction interfaces. 



With the hope that these can be used to eliminate direct
references to the frag list implementation.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 05f77f85

include/linux/skbuff.h

+20 −1
Original line number Diff line number Diff line
@@ -1077,7 +1077,7 @@ extern void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, 
			    int off, int size);



#define SKB_PAGE_ASSERT(skb) 	BUG_ON(skb_shinfo(skb)->nr_frags)

#define SKB_FRAG_ASSERT(skb) 	BUG_ON(skb_shinfo(skb)->frag_list)

#define SKB_FRAG_ASSERT(skb) 	BUG_ON(skb_has_frags(skb))

#define SKB_LINEAR_ASSERT(skb)  BUG_ON(skb_is_nonlinear(skb))



#ifdef NET_SKBUFF_DATA_USES_OFFSET
@@ -1716,6 +1716,25 @@ static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len) 
		     skb = skb->prev)





static inline bool skb_has_frags(const struct sk_buff *skb)

{

	return skb_shinfo(skb)->frag_list != NULL;

}



static inline void skb_frag_list_init(struct sk_buff *skb)

{

	skb_shinfo(skb)->frag_list = NULL;

}



static inline void skb_frag_add_head(struct sk_buff *skb, struct sk_buff *frag)

{

	frag->next = skb_shinfo(skb)->frag_list;

	skb_shinfo(skb)->frag_list = frag;

}



#define skb_walk_frags(skb, iter)	\

	for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next)



extern struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned flags,

					   int *peeked, int *err);

extern struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags,