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Implement more scatter and gather functions in the LinuxKPI.

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Differential Revision:	https://reviews.freebsd.org/D24611
Submitted by:	ashafer_badland.io (Austin Shafer)
MFC after:	1 week
Sponsored by:	Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2020-05-04 09:58:45 +00:00
parent 42f8ef4bf5
commit fe4b041a14
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=360622
1 changed files with 24 additions and 5 deletions
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29
sys/compat/linuxkpi/common/include/linux/scatterlist.h
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@ -66,6 +66,10 @@ struct sg_page_iter {
} internal;
};
struct sg_dma_page_iter {
struct sg_page_iter base;
};
#define SCATTERLIST_MAX_SEGMENT (-1U & ~(PAGE_SIZE - 1))
#define SG_MAX_SINGLE_ALLOC (PAGE_SIZE / sizeof(struct scatterlist))
@ -85,6 +89,8 @@ struct sg_page_iter {
#define for_each_sg_page(sgl, iter, nents, pgoffset) \
for (_sg_iter_init(sgl, iter, nents, pgoffset); \
(iter)->sg; _sg_iter_next(iter))
#define for_each_sg_dma_page(sgl, iter, nents, pgoffset) \
for_each_sg_page(sgl, &(iter)->base, nents, pgoffset)
#define for_each_sg(sglist, sg, sgmax, iter) \
for (iter = 0, sg = (sglist); iter < (sgmax); iter++, sg = sg_next(sg))
@ -404,6 +410,8 @@ sg_page_count(struct scatterlist *sg)
{
return (PAGE_ALIGN(sg->offset + sg->length) >> PAGE_SHIFT);
}
#define sg_dma_page_count(sg) \
sg_page_count(sg)
static inline bool
__sg_page_iter_next(struct sg_page_iter *piter)
@ -426,6 +434,8 @@ __sg_page_iter_next(struct sg_page_iter *piter)
}
return (1);
}
#define __sg_page_iter_dma_next(itr) \
__sg_page_iter_next(&(itr)->base)
static inline void
_sg_iter_init(struct scatterlist *sgl, struct sg_page_iter *iter,
@ -443,11 +453,20 @@ _sg_iter_init(struct scatterlist *sgl, struct sg_page_iter *iter,
}
}
static inline dma_addr_t
sg_page_iter_dma_address(struct sg_page_iter *spi)
{
return (spi->sg->dma_address + (spi->sg_pgoffset << PAGE_SHIFT));
}
/*
* sg_page_iter_dma_address() is implemented as a macro because it
* needs to accept two different and identical structure types. This
* allows both old and new code to co-exist. The compile time assert
* adds some safety, that the structure sizes match.
*/
#define sg_page_iter_dma_address(spi) ({ \
struct sg_page_iter *__spi = (void *)(spi); \
dma_addr_t __dma_address; \
CTASSERT(sizeof(*(spi)) == sizeof(*__spi)); \
__dma_address = __spi->sg->dma_address + \
(__spi->sg_pgoffset << PAGE_SHIFT); \
__dma_address; \
})
static inline struct page *
sg_page_iter_page(struct sg_page_iter *piter)