|
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | AUTHORS | COLOPHON |
MLX5DV_GET_CLOCK_INFO(3) Library Functions Manual MLX5DV_GET_CLOCK_INFO(3)
mlx5dv_get_clock_info - Get device clock information
#include <infiniband/mlx5dv.h>
int mlx5dv_get_clock_info(struct ibv_context *ctx_in,
struct mlx5dv_clock_info *clock_info);
Get the updated core clock_info from the device driver. This
information 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 machine, 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
nanoseconds.
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.
0 on success or the value of errno on failure (which indicates the
failure reason).
mlx5dv(7), mlx5dv_ts_to_ns(3)
Feras Daoud <ferasda@mellanox.com>
This page is part of the rdma-core (RDMA Core Userspace Libraries and
Daemons) project. Information about the project can be found at
⟨https://github.com/linux-rdma/rdma-core⟩. If you have a bug report
for this manual page, send it to linux-rdma@vger.kernel.org. This
page was obtained from the project's upstream Git repository
⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2020-08-13. (At
that time, the date of the most recent commit that was found in the
repository was 2020-08-05.) If you discover any rendering problems
in this HTML version of the page, or you believe there is a better or
more up-to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not part
of the original manual page), send a mail to man-pages@man7.org
1.0.0 2017-11-08 MLX5DV_GET_CLOCK_INFO(3)
Pages that refer to this page: mlx5dv_get_clock_info(3) , mlx5dv_ts_to_ns(3)