IB/mlx5: Mmap the HCA's clock info to user-space
This patch maps the new page to user space applications to
allow converting a user space completion timestamp to system wall
time at the lowest possible latency cost.
By using a versioning scheme we allow compatibility between current
and future userspace libraries.
The change moves mlx5_ib_mmap_cmd enum from mlx5_ib.h to the
abi header file mlx5-abi.h.
Reviewed-by: Alex Vesker <valex@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Feras Daoud <ferasda@mellanox.com>
Signed-off-by: Eitan Rabin <rabin@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/include/uapi/rdma/mlx5-abi.h b/include/uapi/rdma/mlx5-abi.h
index 0299dee..1111aa4 100644
--- a/include/uapi/rdma/mlx5-abi.h
+++ b/include/uapi/rdma/mlx5-abi.h
@@ -124,7 +124,7 @@ struct mlx5_ib_alloc_ucontext_resp {
__u8 cqe_version;
__u8 cmds_supp_uhw;
__u8 eth_min_inline;
- __u8 reserved2;
+ __u8 clock_info_versions;
__u64 hca_core_clock_offset;
__u32 log_uar_size;
__u32 num_uars_per_page;
@@ -394,7 +394,23 @@ struct mlx5_ib_clock_info {
__u64 overflow_period;
};
+enum mlx5_ib_mmap_cmd {
+ MLX5_IB_MMAP_REGULAR_PAGE = 0,
+ MLX5_IB_MMAP_GET_CONTIGUOUS_PAGES = 1,
+ MLX5_IB_MMAP_WC_PAGE = 2,
+ MLX5_IB_MMAP_NC_PAGE = 3,
+ /* 5 is chosen in order to be compatible with old versions of libmlx5 */
+ MLX5_IB_MMAP_CORE_CLOCK = 5,
+ MLX5_IB_MMAP_ALLOC_WC = 6,
+ MLX5_IB_MMAP_CLOCK_INFO = 7,
+};
+
enum {
MLX5_IB_CLOCK_INFO_KERNEL_UPDATING = 1,
};
+
+/* Bit indexes for the mlx5_alloc_ucontext_resp.clock_info_versions bitmap */
+enum {
+ MLX5_IB_CLOCK_INFO_V1 = 0,
+};
#endif /* MLX5_ABI_USER_H */