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authorShiraz Saleem <shiraz.saleem@intel.com>2019-05-06 08:53:32 -0500
committerJason Gunthorpe <jgg@mellanox.com>2019-05-06 13:08:11 -0300
commit4a35339958f16d42a4ca06a8da9d4b5ab39ee8ea (patch)
tree5ac8683e8ff5329f7c5868cf44c0f6cbfa47f24e /include/rdma/ib_verbs.h
parentIB/hfi1: Fix WQ_MEM_RECLAIM warning (diff)
downloadlinux-dev-4a35339958f16d42a4ca06a8da9d4b5ab39ee8ea.tar.xz
linux-dev-4a35339958f16d42a4ca06a8da9d4b5ab39ee8ea.zip
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/ib_verbs.h')
-rw-r--r--include/rdma/ib_verbs.h24
1 files changed, 24 insertions, 0 deletions
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,