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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | AUTHORS | COLOPHON |
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MLX5DV_G...LOCK_INFO(3) Library Functions Manual MLX5DV_G...LOCK_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 <[email protected]>
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
[email protected]. This page was obtained from the
project's upstream Git repository
⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2024-06-14. (At
that time, the date of the most recent commit that was found in
the repository was 2024-06-10.) 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
[email protected]
1.0.0 2017-11-08 MLX5DV_G...LOCK_INFO(3)
Pages that refer to this page: mlx5dv_get_clock_info(3), mlx5dv_ts_to_ns(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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