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Convert magic values into macros in the LinuxKPI scatterlist

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implementation.

Suggested by:		cem @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2017-02-22 20:24:09 +00:00
parent 1cdefd084d
commit 72ebbe00b3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=314109
1 changed files with 13 additions and 9 deletions
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22
sys/compat/linuxkpi/common/include/linux/scatterlist.h
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@ -38,12 +38,15 @@
struct scatterlist {
unsigned long page_link;
#define SG_PAGE_LINK_CHAIN 0x1UL
#define SG_PAGE_LINK_LAST 0x2UL
#define SG_PAGE_LINK_MASK 0x3UL
unsigned int offset;
unsigned int length;
dma_addr_t address;
};
CTASSERT((sizeof(struct scatterlist) & 0x3) == 0);
CTASSERT((sizeof(struct scatterlist) & SG_PAGE_LINK_MASK) == 0);
struct sg_table {
struct scatterlist *sgl;
@ -65,10 +68,10 @@ struct sg_page_iter {
#define SG_MAGIC 0x87654321UL
#define sg_is_chain(sg) ((sg)->page_link & 0x01)
#define sg_is_last(sg) ((sg)->page_link & 0x02)
#define sg_is_chain(sg) ((sg)->page_link & SG_PAGE_LINK_CHAIN)
#define sg_is_last(sg) ((sg)->page_link & SG_PAGE_LINK_LAST)
#define sg_chain_ptr(sg) \
((struct scatterlist *) ((sg)->page_link & ~0x03))
((struct scatterlist *) ((sg)->page_link & ~SG_PAGE_LINK_MASK))
#define sg_dma_address(sg) (sg)->address
#define sg_dma_len(sg) (sg)->length
@ -86,7 +89,7 @@ typedef void (sg_free_fn) (struct scatterlist *, unsigned int);
static inline void
sg_assign_page(struct scatterlist *sg, struct page *page)
{
unsigned long page_link = sg->page_link & 0x3;
unsigned long page_link = sg->page_link & SG_PAGE_LINK_MASK;
sg->page_link = page_link | (unsigned long)page;
}
@ -103,7 +106,7 @@ sg_set_page(struct scatterlist *sg, struct page *page, unsigned int len,
static inline struct page *
sg_page(struct scatterlist *sg)
{
return ((struct page *)((sg)->page_link & ~0x3));
return ((struct page *)((sg)->page_link & ~SG_PAGE_LINK_MASK));
}
static inline void
@ -138,14 +141,15 @@ sg_chain(struct scatterlist *prv, unsigned int prv_nents,
sg->offset = 0;
sg->length = 0;
sg->page_link = ((unsigned long)sgl | 0x01) & ~0x02;
sg->page_link = ((unsigned long)sgl |
SG_PAGE_LINK_CHAIN) & ~SG_PAGE_LINK_LAST;
}
static inline void
sg_mark_end(struct scatterlist *sg)
{
sg->page_link |= 0x02;
sg->page_link &= ~0x01;
sg->page_link |= SG_PAGE_LINK_LAST;
sg->page_link &= ~SG_PAGE_LINK_CHAIN;
}
static inline void