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net/mlx5: fix committed bucket size

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Committed Bucket Size calculation tries to fit into 8-bit wide
mantissa field by setting 256 as a maximum value for it.
To compensate for this increase in the mantissa value the exponent
value has to be reduced by 8. But it gives a negative exponent
value for CBS less than 128. And negative exponent value is not
supported by the NIC. Adjust CSB calculation only for values
bigger than 128 to allow both small and big bucket sizes.

Fixes: 3bd26b23ce ("net/mlx5: support meter profile operations")
Cc: stable@dpdk.org

Signed-off-by: Alexander Kozyrev <akozyrev@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
This commit is contained in:
Alexander Kozyrev 2022-02-07 15:28:40 +02:00 committed by Raslan Darawsheh
parent 793f5f4a34
commit 21fdeab422
1 changed files with 4 additions and 2 deletions
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6
drivers/net/mlx5/mlx5_flow_meter.c
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@ -295,8 +295,10 @@ mlx5_flow_meter_xbs_man_exp_calc(uint64_t xbs, uint8_t *man, uint8_t *exp)
}
/* xbs = xbs_mantissa * 2^xbs_exponent */
_man = frexp(xbs, &_exp);
_man = _man * pow(2, MLX5_MAN_WIDTH);
_exp = _exp - MLX5_MAN_WIDTH;
if (_exp >= MLX5_MAN_WIDTH) {
_man = _man * pow(2, MLX5_MAN_WIDTH);
_exp = _exp - MLX5_MAN_WIDTH;
}
*man = (uint8_t)ceil(_man);
*exp = _exp;
}