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net: add skb frag size accessors

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To ease skb->truesize sanitization, its better to be able to localize
all references to skb frags size.

Define accessors : skb_frag_size() to fetch frag size, and
skb_frag_size_{set|add|sub}() to manipulate it.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2011-10-18 21:00:24 +00:00
committed by David S. Miller
parent dd767856a3
commit 9e903e0852
87 changed files with 387 additions and 357 deletions
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include/linux/skbuff.h
+24 -4
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@@ -150,6 +150,26 @@ struct skb_frag_struct {
#endif
};
static inline unsigned int skb_frag_size(const skb_frag_t *frag)
{
return frag->size;
}
static inline void skb_frag_size_set(skb_frag_t *frag, unsigned int size)
{
frag->size = size;
}
static inline void skb_frag_size_add(skb_frag_t *frag, int delta)
{
frag->size += delta;
}
static inline void skb_frag_size_sub(skb_frag_t *frag, int delta)
{
frag->size -= delta;
}
#define HAVE_HW_TIME_STAMP
/**
@@ -1132,7 +1152,7 @@ static inline int skb_pagelen(const struct sk_buff *skb)
int i, len = 0;
for (i = (int)skb_shinfo(skb)->nr_frags - 1; i >= 0; i--)
len += skb_shinfo(skb)->frags[i].size;
len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
return len + skb_headlen(skb);
}
@@ -1156,7 +1176,7 @@ static inline void __skb_fill_page_desc(struct sk_buff *skb, int i,
frag->page = page;
frag->page_offset = off;
frag->size = size;
skb_frag_size_set(frag, size);
}
/**
@@ -1907,10 +1927,10 @@ static inline int skb_can_coalesce(struct sk_buff *skb, int i,
const struct page *page, int off)
{
if (i) {
struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i - 1];
const struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i - 1];
return page == skb_frag_page(frag) &&
off == frag->page_offset + frag->size;
off == frag->page_offset + skb_frag_size(frag);
}
return 0;
}