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linux: Add skb_frag_t page_offset accessors 

Add skb_frag_off(), skb_frag_off_add(), skb_frag_off_set(),
and skb_frag_off_copy() accessors for page_offset.

Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jonathan Lemon 2019-07-30 07:40:32 -07:00 committed by David S. Miller
parent 6ca04afbf9
commit 7240b60c98
1 changed files with 59 additions and 8 deletions
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67
include/linux/skbuff.h
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@ -312,7 +312,7 @@ extern int sysctl_max_skb_frags;
typedef struct bio_vec skb_frag_t;
/**
* skb_frag_size - Returns the size of a skb fragment
* skb_frag_size() - Returns the size of a skb fragment
* @frag: skb fragment
*/
static inline unsigned int skb_frag_size(const skb_frag_t *frag)
@ -321,7 +321,7 @@ static inline unsigned int skb_frag_size(const skb_frag_t *frag)
}
/**
* skb_frag_size_set - Sets the size of a skb fragment
* skb_frag_size_set() - Sets the size of a skb fragment
* @frag: skb fragment
* @size: size of fragment
*/
@ -331,7 +331,7 @@ static inline void skb_frag_size_set(skb_frag_t *frag, unsigned int size)
}
/**
* skb_frag_size_add - Incrementes the size of a skb fragment by %delta
* skb_frag_size_add() - Increments the size of a skb fragment by @delta
* @frag: skb fragment
* @delta: value to add
*/
@ -341,7 +341,7 @@ static inline void skb_frag_size_add(skb_frag_t *frag, int delta)
}
/**
* skb_frag_size_sub - Decrements the size of a skb fragment by %delta
* skb_frag_size_sub() - Decrements the size of a skb fragment by @delta
* @frag: skb fragment
* @delta: value to subtract
*/
@ -2857,6 +2857,46 @@ static inline void skb_propagate_pfmemalloc(struct page *page,
skb->pfmemalloc = true;
}
/**
* skb_frag_off() - Returns the offset of a skb fragment
* @frag: the paged fragment
*/
static inline unsigned int skb_frag_off(const skb_frag_t *frag)
{
return frag->page_offset;
}
/**
* skb_frag_off_add() - Increments the offset of a skb fragment by @delta
* @frag: skb fragment
* @delta: value to add
*/
static inline void skb_frag_off_add(skb_frag_t *frag, int delta)
{
frag->page_offset += delta;
}
/**
* skb_frag_off_set() - Sets the offset of a skb fragment
* @frag: skb fragment
* @offset: offset of fragment
*/
static inline void skb_frag_off_set(skb_frag_t *frag, unsigned int offset)
{
frag->page_offset = offset;
}
/**
* skb_frag_off_copy() - Sets the offset of a skb fragment from another fragment
* @fragto: skb fragment where offset is set
* @fragfrom: skb fragment offset is copied from
*/
static inline void skb_frag_off_copy(skb_frag_t *fragto,
const skb_frag_t *fragfrom)
{
fragto->page_offset = fragfrom->page_offset;
}
/**
* skb_frag_page - retrieve the page referred to by a paged fragment
* @frag: the paged fragment
@ -2923,7 +2963,7 @@ static inline void skb_frag_unref(struct sk_buff *skb, int f)
*/
static inline void *skb_frag_address(const skb_frag_t *frag)
{
return page_address(skb_frag_page(frag)) + frag->page_offset;
return page_address(skb_frag_page(frag)) + skb_frag_off(frag);
}
/**
@ -2939,7 +2979,18 @@ static inline void *skb_frag_address_safe(const skb_frag_t *frag)
if (unlikely(!ptr))
return NULL;
return ptr + frag->page_offset;
return ptr + skb_frag_off(frag);
}
/**
* skb_frag_page_copy() - sets the page in a fragment from another fragment
* @fragto: skb fragment where page is set
* @fragfrom: skb fragment page is copied from
*/
static inline void skb_frag_page_copy(skb_frag_t *fragto,
const skb_frag_t *fragfrom)
{
fragto->bv_page = fragfrom->bv_page;
}
/**
@ -2987,7 +3038,7 @@ static inline dma_addr_t skb_frag_dma_map(struct device *dev,
enum dma_data_direction dir)
{
return dma_map_page(dev, skb_frag_page(frag),
frag->page_offset + offset, size, dir);
skb_frag_off(frag) + offset, size, dir);
}
static inline struct sk_buff *pskb_copy(struct sk_buff *skb,
@ -3157,7 +3208,7 @@ static inline bool skb_can_coalesce(struct sk_buff *skb, int i,
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
return page == skb_frag_page(frag) &&
off == frag->page_offset + skb_frag_size(frag);
off == skb_frag_off(frag) + skb_frag_size(frag);
}
return false;
}