Clock info #284
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Clock info #284
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The travis failure is checkpatch and looks ignorable to me |
This patch maps the kernel driver's clock info page to userspace. With this, users will be able to read the clock info directly from the shared page without any system calls. Signed-off-by: Feras Daoud <ferasda@mellanox.com> Signed-off-by: Eitan Rabin <rabin@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Allow retrieving the current clock info with a direct verb. This allows DV consumers to directly cache and control the safely copied version of the clock data. A C11 atomic is used to ensure the copy of the kernel data is done atomically. A new mlx5dv attribute "max_clock_info_update_nsec" was added to indicate the maximum period that the user can correctly use the cached clock info, it can be retrieved by using the mlx5dv_query_device API. Signed-off-by: Feras Daoud <ferasda@mellanox.com> Signed-off-by: Eitan Rabin <rabin@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Add a direct verb that translates device timestamps from HCA core clock units to nanoseconds using the device clock info. Signed-off-by: Feras Daoud <ferasda@mellanox.com> Signed-off-by: Eitan Rabin <rabin@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
…econds Add support to read completion timestamp and convert it from HCA clock units to wallclock nanoseconds. This commit revises the documentation for ibv_wc_read_completion_ts to clarify the return value time units. Signed-off-by: Feras Daoud <ferasda@mellanox.com> Signed-off-by: Eitan Rabin <rabin@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Implement the read_completion_wallclock_ns CQ reader. This internally fetches the clock page and converts the device timestamp using the existing DV api. The commit also revises mlx5_cq_fill_pfns return value. Signed-off-by: Feras Daoud <ferasda@mellanox.com> Signed-off-by: Eitan Rabin <rabin@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
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This series adds the ability to query mlx5 core clock info and translates timestamps from HCA core clock units to nanoseconds using the clock info.
The supplementary kernel part was sent upstream for 4.16.