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net/mlx5: Update cyclecounter shift value to improve ptp free running mode precision

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Multiplier values are equivalent to 2^(shift constant) since all mlx5
devices advertise a 1Ghz frequency for the internal timer. The previous
shift constant of 23 led to internal timer adjustments only taking place
when the provided adjustment values were greater than or equal to ~120 ppb
or ~7864 scaled ppm. Using a shift constant of 31 enables adjustments when
an adjustment parameter is greater than or equal to ~0.47 ppb or ~30.8
scaled ppm.

Signed-off-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Reviewed-by: Bar Shapira <bshapira@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Rahul Rameshbabu
2023-03-08 08:18:22 -08:00
committed by Saeed Mahameed
parent 1a62ffcaaa
commit 6a40109275
1 changed files with 1 additions and 1 deletions
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drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
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@@ -39,7 +39,7 @@
#include "clock.h" #include "clock.h"
enum { enum {
MLX5_CYCLES_SHIFT = 23 MLX5_CYCLES_SHIFT = 31
}; };
enum { enum {