From ee0398717078260ee4ffa97d407071bc774e2dac Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 9 Jun 2009 00:17:13 -0700 Subject: [PATCH] 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: David S. Miller --- include/linux/skbuff.h | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index aad484cd5863..f1c93b878b3b 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -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, -- 2.30.2