diff options
| author | Shiraz Saleem <shiraz.saleem@intel.com> | 2019-05-06 16:53:32 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-05-06 19:08:11 +0300 |
| commit | 4a35339958f16d42a4ca06a8da9d4b5ab39ee8ea (patch) | |
| tree | 5ac8683e8ff5329f7c5868cf44c0f6cbfa47f24e /include/rdma | |
| parent | 4c4b1996b5db688e2dcb8242b0a3bf7b1e845e42 (diff) | |
| download | linux-4a35339958f16d42a4ca06a8da9d4b5ab39ee8ea.tar.xz | |
RDMA/umem: Add API to find best driver supported page size in an MR
This helper iterates through the SG list to find the best page size to use
from a bitmap of HW supported page sizes. Drivers that support multiple
page sizes, but not mixed sizes in an MR can use this API.
Suggested-by: Jason Gunthorpe <jgg@ziepe.ca>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'include/rdma')
| -rw-r--r-- | include/rdma/ib_umem.h | 9 | ||||
| -rw-r--r-- | include/rdma/ib_verbs.h | 24 |
2 files changed, 33 insertions, 0 deletions
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h index b13a2e9a50d4..917b687010f0 100644 --- a/include/rdma/ib_umem.h +++ b/include/rdma/ib_umem.h @@ -87,6 +87,9 @@ void ib_umem_release(struct ib_umem *umem); int ib_umem_page_count(struct ib_umem *umem); int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset, size_t length); +unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem, + unsigned long pgsz_bitmap, + unsigned long virt); #else /* CONFIG_INFINIBAND_USER_MEM */ @@ -104,6 +107,12 @@ static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offs size_t length) { return -EINVAL; } +static inline int ib_umem_find_best_pgsz(struct ib_umem *umem, + unsigned long pgsz_bitmap, + unsigned long virt) { + return -EINVAL; +} + #endif /* CONFIG_INFINIBAND_USER_MEM */ #endif /* IB_UMEM_H */ diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 8f8965f8ffdb..03b07ec6a34b 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -3250,6 +3250,30 @@ static inline bool rdma_cap_read_inv(struct ib_device *dev, u32 port_num) return rdma_protocol_iwarp(dev, port_num); } +/** + * rdma_find_pg_bit - Find page bit given address and HW supported page sizes + * + * @addr: address + * @pgsz_bitmap: bitmap of HW supported page sizes + */ +static inline unsigned int rdma_find_pg_bit(unsigned long addr, + unsigned long pgsz_bitmap) +{ + unsigned long align; + unsigned long pgsz; + + align = addr & -addr; + + /* Find page bit such that addr is aligned to the highest supported + * HW page size + */ + pgsz = pgsz_bitmap & ~(-align << 1); + if (!pgsz) + return __ffs(pgsz_bitmap); + + return __fls(pgsz); +} + int ib_set_vf_link_state(struct ib_device *device, int vf, u8 port, int state); int ib_get_vf_config(struct ib_device *device, int vf, u8 port, |