linux-kernel - [PATCH mlx5-next] net/mlx5: Add RS FEC histogram infrastructure

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Message-ID: <1756884600-520195-1-git-send-email-tariqt@nvidia.com>
Date: Wed, 3 Sep 2025 10:30:00 +0300
From: Tariq Toukan <tariqt@...dia.com>
To: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.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>, Tariq Toukan <tariqt@...dia.com>, "Mark
 Bloch" <mbloch@...dia.com>, <netdev@...r.kernel.org>,
	<linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Gal Pressman
	<gal@...dia.com>, Vadim Fedorenko <vadim.fedorenko@...ux.dev>, Dragos Tatulea
	<dtatulea@...dia.com>, Carolina Jubran <cjubran@...dia.com>, Yael Chemla
	<ychemla@...dia.com>
Subject: [PATCH mlx5-next] net/mlx5: Add RS FEC histogram infrastructure

From: Carolina Jubran <cjubran@...dia.com>

Define the Ports Phy Histogram Configuration Register (PPHCR) to expose
RS-FEC histogram bin ranges, and expose a new counter group in the Ports
Performance Counters Register (PPCNT) to report the corresponding
histogram values.

Co-developed-by: Yael Chemla <ychemla@...dia.com>
Signed-off-by: Yael Chemla <ychemla@...dia.com>
Signed-off-by: Carolina Jubran <cjubran@...dia.com>
Reviewed-by: Dragos Tatulea <dtatulea@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 include/linux/mlx5/device.h   |  1 +
 include/linux/mlx5/driver.h   |  1 +
 include/linux/mlx5/mlx5_ifc.h | 29 +++++++++++++++++++++++++++++
 3 files changed, 31 insertions(+)

diff --git a/include/linux/mlx5/device.h b/include/linux/mlx5/device.h
index 72a83666e67f..d7f46a8fbfa1 100644
--- a/include/linux/mlx5/device.h
+++ b/include/linux/mlx5/device.h
@@ -1525,6 +1525,7 @@ enum {
 	MLX5_PHYSICAL_LAYER_RECOVERY_GROUP    = 0x1a,
 	MLX5_INFINIBAND_PORT_COUNTERS_GROUP   = 0x20,
 	MLX5_INFINIBAND_EXTENDED_PORT_COUNTERS_GROUP = 0x21,
+	MLX5_RS_FEC_HISTOGRAM_GROUP = 0x23,
 };
 
 enum {
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index 8c5fbfb85749..c0858af0e854 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -130,6 +130,7 @@ enum {
 	MLX5_REG_PDDR		 = 0x5031,
 	MLX5_REG_PMLP		 = 0x5002,
 	MLX5_REG_PPLM		 = 0x5023,
+	MLX5_REG_PPHCR		 = 0x503E,
 	MLX5_REG_PCAM		 = 0x507f,
 	MLX5_REG_NODE_DESC	 = 0x6001,
 	MLX5_REG_HOST_ENDIANNESS = 0x7004,
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index e9f14a0c7f4f..097b1b7ada63 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -4901,6 +4901,11 @@ union mlx5_ifc_field_select_802_1_r_roce_auto_bits {
 	u8         reserved_at_0[0x20];
 };
 
+struct mlx5_ifc_rs_histogram_cntrs_bits {
+	u8         hist[16][0x40];
+	u8         reserved_at_400[0x2c0];
+};
+
 union mlx5_ifc_eth_cntrs_grp_data_layout_auto_bits {
 	struct mlx5_ifc_eth_802_3_cntrs_grp_data_layout_bits eth_802_3_cntrs_grp_data_layout;
 	struct mlx5_ifc_eth_2863_cntrs_grp_data_layout_bits eth_2863_cntrs_grp_data_layout;
@@ -4915,6 +4920,7 @@ union mlx5_ifc_eth_cntrs_grp_data_layout_auto_bits {
 	struct mlx5_ifc_phys_layer_cntrs_bits phys_layer_cntrs;
 	struct mlx5_ifc_phys_layer_statistical_cntrs_bits phys_layer_statistical_cntrs;
 	struct mlx5_ifc_phys_layer_recovery_cntrs_bits phys_layer_recovery_cntrs;
+	struct mlx5_ifc_rs_histogram_cntrs_bits rs_histogram_cntrs;
 	u8         reserved_at_0[0x7c0];
 };
 
@@ -11738,6 +11744,28 @@ struct mlx5_ifc_mtctr_reg_bits {
 	u8         second_clock_timestamp[0x40];
 };
 
+struct mlx5_ifc_bin_range_layout_bits {
+	u8         reserved_at_0[0xa];
+	u8         high_val[0x6];
+	u8         reserved_at_10[0xa];
+	u8         low_val[0x6];
+};
+
+struct mlx5_ifc_pphcr_reg_bits {
+	u8         active_hist_type[0x4];
+	u8         reserved_at_4[0x4];
+	u8         local_port[0x8];
+	u8         reserved_at_10[0x10];
+
+	u8         reserved_at_20[0x8];
+	u8         num_of_bins[0x8];
+	u8         reserved_at_30[0x10];
+
+	u8         reserved_at_40[0x40];
+
+	struct mlx5_ifc_bin_range_layout_bits bin_range[16];
+};
+
 union mlx5_ifc_ports_control_registers_document_bits {
 	struct mlx5_ifc_bufferx_reg_bits bufferx_reg;
 	struct mlx5_ifc_eth_2819_cntrs_grp_data_layout_bits eth_2819_cntrs_grp_data_layout;
@@ -11804,6 +11832,7 @@ union mlx5_ifc_ports_control_registers_document_bits {
 	struct mlx5_ifc_mtmp_reg_bits mtmp_reg;
 	struct mlx5_ifc_mtptm_reg_bits mtptm_reg;
 	struct mlx5_ifc_mtctr_reg_bits mtctr_reg;
+	struct mlx5_ifc_pphcr_reg_bits pphcr_reg;
 	u8         reserved_at_0[0x60e0];
 };
 

base-commit: 04a3134f88a4bd03001a3093144819523cfca99e
-- 
2.31.1