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RDMA/umem: Add rdma_umem_for_each_dma_block()

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This helper does the same as rdma_for_each_block(), except it works on a
umem. This simplifies most of the call sites.

Link: https://lore.kernel.org/r/4-v2-270386b7e60b+28f4-umem_1_jgg@nvidia.com
Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Acked-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jason Gunthorpe
2020-09-04 19:41:45 -03:00
parent 3361c29e92
commit ebc24096c4
6 changed files with 25 additions and 7 deletions
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20
include/rdma/ib_umem.h
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@@ -40,6 +40,26 @@ static inline size_t ib_umem_num_pages(struct ib_umem *umem)
PAGE_SHIFT;
}
static inline void __rdma_umem_block_iter_start(struct ib_block_iter *biter,
struct ib_umem *umem,
unsigned long pgsz)
{
__rdma_block_iter_start(biter, umem->sg_head.sgl, umem->nmap, pgsz);
}
/**
* rdma_umem_for_each_dma_block - iterate over contiguous DMA blocks of the umem
* @umem: umem to iterate over
* @pgsz: Page size to split the list into
*
* pgsz must be <= PAGE_SIZE or computed by ib_umem_find_best_pgsz(). The
* returned DMA blocks will be aligned to pgsz and span the range:
* ALIGN_DOWN(umem->address, pgsz) to ALIGN(umem->address + umem->length, pgsz)
*/
#define rdma_umem_for_each_dma_block(umem, biter, pgsz) \
for (__rdma_umem_block_iter_start(biter, umem, pgsz); \
__rdma_block_iter_next(biter);)
#ifdef CONFIG_INFINIBAND_USER_MEM
struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr,