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| author | Jason Gunthorpe <jgg@nvidia.com> | 2020-09-05 00:41:45 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2020-09-09 20:33:17 +0200 |
| commit | ebc24096c4c40017d9f9b0fddc5d69b94ad10369 (patch) | |
| tree | 27988092ea178560fb2fb0d94172f951d4b961fb /include/rdma | |
| parent | RDMA/umem: Use simpler logic for ib_umem_find_best_pgsz() (diff) | |
| download | linux-ebc24096c4c40017d9f9b0fddc5d69b94ad10369.tar.xz linux-ebc24096c4c40017d9f9b0fddc5d69b94ad10369.zip | |
RDMA/umem: Add rdma_umem_for_each_dma_block()
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>
Diffstat (limited to 'include/rdma')
| -rw-r--r-- | include/rdma/ib_umem.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h index 07a764eb692e..b880512ba95f 100644 --- a/include/rdma/ib_umem.h +++ b/include/rdma/ib_umem.h @@ -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, |