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net/mlx5e: Report RS-FEC histogram statistics via ethtool

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Add support for reporting RS-FEC histogram counters by reading them
from the RS_FEC_HISTOGRAM_GROUP in the PPCNT register.

Co-developed-by: Yael Chemla <ychemla@nvidia.com>
Signed-off-by: Yael Chemla <ychemla@nvidia.com>
Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Yael Chemla <ychemla@nvidia.com>
Link: https://patch.msgid.link/20250924124037.1508846-5-vadim.fedorenko@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Carolina Jubran 2025-09-24 12:40:36 +00:00 committed by Jakub Kicinski
parent 44907e7c8f
commit ca80036839
1 changed files with 33 additions and 1 deletions
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34
drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
View File

@ -1555,15 +1555,47 @@ fec_rs_histogram_fill_ranges(struct mlx5e_priv *priv, int mode,
return num_of_bins;
}
static void fec_rs_histogram_fill_stats(struct mlx5e_priv *priv,
u8 num_of_bins,
struct ethtool_fec_hist *hist)
{
struct mlx5_core_dev *mdev = priv->mdev;
u32 out[MLX5_ST_SZ_DW(ppcnt_reg)] = {0};
u32 in[MLX5_ST_SZ_DW(ppcnt_reg)] = {0};
int sz = MLX5_ST_SZ_BYTES(ppcnt_reg);
void *rs_histogram_cntrs;
MLX5_SET(ppcnt_reg, in, local_port, 1);
MLX5_SET(ppcnt_reg, in, grp, MLX5_RS_FEC_HISTOGRAM_GROUP);
if (mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_PPCNT, 0, 0))
return;
rs_histogram_cntrs = MLX5_ADDR_OF(ppcnt_reg, out,
counter_set.rs_histogram_cntrs);
/* Guaranteed that num_of_bins is less than MLX5E_FEC_RS_HIST_MAX
* by fec_rs_histogram_fill_ranges().
*/
for (int i = 0; i < num_of_bins; i++)
hist->values[i].sum = MLX5_GET64(rs_histogram_cntrs,
rs_histogram_cntrs,
hist[i]);
}
static void fec_set_histograms_stats(struct mlx5e_priv *priv, int mode,
struct ethtool_fec_hist *hist)
{
u8 num_of_bins;
switch (mode) {
case MLX5E_FEC_RS_528_514:
case MLX5E_FEC_RS_544_514:
case MLX5E_FEC_LLRS_272_257_1:
case MLX5E_FEC_RS_544_514_INTERLEAVED_QUAD:
fec_rs_histogram_fill_ranges(priv, mode, &hist->ranges);
num_of_bins =
fec_rs_histogram_fill_ranges(priv, mode, &hist->ranges);
if (num_of_bins)
return fec_rs_histogram_fill_stats(priv, num_of_bins,
hist);
break;
default:
return;