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

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Message-ID: <1768200608-1543180-1-git-send-email-tariqt@nvidia.com>
Date: Mon, 12 Jan 2026 08:50:08 +0200
From: Tariq Toukan <tariqt@...dia.com>
To: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	Tariq Toukan <tariqt@...dia.com>, Mark Bloch <mbloch@...dia.com>,
	<netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
 S. Miller" <davem@...emloft.net>, Gal Pressman <gal@...dia.com>, "Moshe
 Shemesh" <moshe@...dia.com>, Dragos Tatulea <dtatulea@...dia.com>, "Alexei
 Lazar" <alazar@...dia.com>
Subject: [PATCH mlx5-next] net/mlx5: Add IFC bits for extended ETS rate limit bandwidth value

From: Alexei Lazar <alazar@...dia.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@...dia.com>
Reviewed-by: Dragos Tatulea <dtatulea@...dia.com>
Reviewed-by: Gal Pressman <gal@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.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