[PATCH mlx5-next] net/mlx5: Add IFC bits for extended ETS rate limit bandwidth value

[PATCH mlx5-next] net/mlx5: Add IFC bits for extended ETS rate limit bandwidth value

[Tariq Toukan]

From: Alexei Lazar <alazar@nvidia.com>

Add hardware interface definitions to support extended bandwidth rate
limiting in the QoS Enhanced Transmission Selection (ETS) configuration.

The new fields include:
- max_bw_value: extended from 8-bit to 16-bit in ets_tcn_config_reg,
  simplifying the implementation by using a single field instead of
  separate MSB/LSB fields.
- qetcr_qshr_max_bw_val_msb: capability bit in qcam_qos_feature_cap_mask
  indicating device support for the extended 16-bit max_bw_value field.

These interface additions are prerequisites for increasing the per-TC
rate limit beyond 255 Gbps to support higher-bandwidth NICs.

Signed-off-by: Alexei Lazar <alazar@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 include/linux/mlx5/mlx5_ifc.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index e844cfa4fe0a..775cb0c56865 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -11009,7 +11009,9 @@ struct mlx5_ifc_qcam_access_reg_cap_mask {
 };
 
 struct mlx5_ifc_qcam_qos_feature_cap_mask {
-	u8         qcam_qos_feature_cap_mask_127_to_1[0x7F];
+	u8         qcam_qos_feature_cap_mask_127_to_5[0x7B];
+	u8         qetcr_qshr_max_bw_val_msb[0x1];
+	u8         qcam_qos_feature_cap_mask_3_to_1[0x3];
 	u8         qpts_trust_both[0x1];
 };
 
@@ -11965,8 +11967,7 @@ struct mlx5_ifc_ets_tcn_config_reg_bits {
 
 	u8         reserved_at_20[0xc];
 	u8         max_bw_units[0x4];
-	u8         reserved_at_30[0x8];
-	u8         max_bw_value[0x8];
+	u8         max_bw_value[0x10];
 };
 
 struct mlx5_ifc_ets_global_config_reg_bits {

base-commit: f0b2fde98065e49795ce6824837b3f53fdf16e5d
-- 
2.31.1

Re: [PATCH mlx5-next] net/mlx5: Add IFC bits for extended ETS rate limit bandwidth value

[Leon Romanovsky]

On Mon, 12 Jan 2026 08:50:08 +0200, Tariq Toukan wrote:
> Add hardware interface definitions to support extended bandwidth rate
> limiting in the QoS Enhanced Transmission Selection (ETS) configuration.
> 
> The new fields include:
> - max_bw_value: extended from 8-bit to 16-bit in ets_tcn_config_reg,
>   simplifying the implementation by using a single field instead of
>   separate MSB/LSB fields.
> - qetcr_qshr_max_bw_val_msb: capability bit in qcam_qos_feature_cap_mask
>   indicating device support for the extended 16-bit max_bw_value field.
> 
> [...]

Applied, thanks!

[1/1] net/mlx5: Add IFC bits for extended ETS rate limit bandwidth value
      https://git.kernel.org/rdma/rdma/c/49e41f3ea3f754

Best regards,
-- 
Leon Romanovsky <leon@kernel.org>