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authorFeras Daoud <ferasda@mellanox.com>2018-01-16 20:08:41 +0200
committerDoug Ledford <dledford@redhat.com>2018-01-18 14:49:21 -0500
commit5c99eaecb1fce76e86cf74020624e36fbb63c3bf (patch)
tree41b190412ee9831aa582c8f8b19300971b68b50d /include/uapi/rdma
parent24d33d2c8e92abffe1f0653d42fc65b8f164a6d9 (diff)
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>
Diffstat (limited to 'include/uapi/rdma')
-rw-r--r--include/uapi/rdma/mlx5-abi.h18
1 files changed, 17 insertions, 1 deletions
diff --git a/include/uapi/rdma/mlx5-abi.h b/include/uapi/rdma/mlx5-abi.h
index 0299deed71a2..1111aa4e7c1e 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 */

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