MLX5DV_GET_CLOCK_INFO(3) Library Functions Manual MLX5DV_GET_CLOCK_INFO(3)
NAME
mlx5dv_get_clock_info - Get device clock information
SYNOPSIS
#include <infiniband/mlx5dv.h>
int mlx5dv_get_clock_info(struct ibv_context *ctx_in,
struct mlx5dv_clock_info *clock_info);
DESCRIPTION
Get the updated core clock_info from the device driver. This informa-
tion will be used later to translate the completion timestamp from HCA
core clock to nanoseconds. The values of the clock are updated from the
driver's PTP clock, therefore, without a running PTP client on the ma-
chine, the wall clock conversion will not be accurate.
Pass the latest struct mlx5dv_clock_info to mlx5dv_ts_to_ns(3) in order
to translate the completion timestamp from HCA core clock to nanosec-
onds.
If the clock_info becomes too old then time conversion will return
wrong conversion results. The user must ensure that
mlx5dv_get_clock_info(3) is called at least once every
max_clock_info_update_nsec as returned by the mlx5dv_query_device(3)
function.
RETURN VALUE
0 on success or the value of errno on failure (which indicates the
failure reason).
SEE ALSO
mlx5dv(7), mlx5dv_ts_to_ns(3)
AUTHORS
Feras Daoud <ferasda@mellanox.com>
1.0.0 2017-11-08 MLX5DV_GET_CLOCK_INFO(3)
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