Expose mlx5 core driver's clock information

This series adds the ability to query mlx5 core clock info from userspace applications. This will allow userspace applications to translate timestamps from HCA core clock units to nanoseconds using the latest clock info.

The first patch creates a new clock info page, which will be updated in the kernel only, and the second patch maps the page to userspace.

In order to read the clock info correctly, 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 ensure correctness, the user will:

repeat:
seq1 = <read sequence>
goto <repeate> while odd
<read data structure>
seq2 = <read sequence>
if seq1 != seq2 goto repeat

Thanks

Feras Daoud (2):
net/mlx5e: Add clock info page to mlx5 core devices IB/mlx5: Mmap the HCA's clock info to user-space

 drivers/infiniband/hw/mlx5/main.c                  | 44 ++++++++++++++++-
 drivers/infiniband/hw/mlx5/mlx5_ib.h               | 10 ----
 .../net/ethernet/mellanox/mlx5/core/lib/clock.c    | 55 ++++++++++++++++++++++
 include/linux/mlx5/driver.h                        |  3 ++
 include/uapi/rdma/mlx5-abi.h                       | 34 ++++++++++++-
 5 files changed, 133 insertions(+), 13 deletions(-)

--
2.15.1

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