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authorFeras Daoud <ferasda@mellanox.com>2018-01-16 20:08:40 +0200
committerDoug Ledford <dledford@redhat.com>2018-01-18 14:49:21 -0500
commit24d33d2c8e92abffe1f0653d42fc65b8f164a6d9 (patch)
treecb353d5f02e6d1c61c06a10fbdfd8798e41c808b /include/uapi/rdma
parent246d8b184c100e8eb6b4e8c88f232c2ed2a4e672 (diff)
net/mlx5e: Add clock info page to mlx5 core devices
Adds a new page to mlx5 core containing clock info data that allows user level applications to translate between cqe timestamp to nanoseconds. The information stored into this page is represented through mlx5_ib_clock_info. In order to synchronize between kernel and user space a sequence number is incremented at the beginning and end of each update. An odd number means the data is being updated while an even means the access was already done. To guarantee that the data structure was accessed atomically user will: repeat: seq1 = <read sequence> goto <repeate> while odd <read data structure> seq2 = <read sequence> if seq1 != seq2 goto repeat Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Reviewed-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Alex Vesker <valex@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.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/uapi/rdma/mlx5-abi.h b/include/uapi/rdma/mlx5-abi.h
index f6d319dfc7bf..0299deed71a2 100644
--- a/include/uapi/rdma/mlx5-abi.h
+++ b/include/uapi/rdma/mlx5-abi.h
@@ -381,4 +381,20 @@ struct mlx5_ib_modify_wq {
__u32 comp_mask;
__u32 reserved;
};
+
+struct mlx5_ib_clock_info {
+ __u32 sign;
+ __u32 resv;
+ __u64 nsec;
+ __u64 cycles;
+ __u64 frac;
+ __u32 mult;
+ __u32 shift;
+ __u64 mask;
+ __u64 overflow_period;
+};
+
+enum {
+ MLX5_IB_CLOCK_INFO_KERNEL_UPDATING = 1,
+};
#endif /* MLX5_ABI_USER_H */

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