net/mlx5: Add support for MTPTM and MTCTR registers

Make Management Precision Time Measurement (MTPTM) register and Management
Cross Timestamp (MTCTR) register usable in mlx5 driver.

Signed-off-by: Rahul Rameshbabu <[email protected]>
Signed-off-by: Tariq Toukan <[email protected]>
Reviewed-by: Wojciech Drewek <[email protected]>
Tested-by: Vadim Fedorenko <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Binary-Eater

drivers/net/ethernet/mellanox/mlx5/core/fw.c

@@ -224,6 +224,7 @@ int mlx5_query_hca_caps(struct mlx5_core_dev *dev)
 	if (MLX5_CAP_GEN(dev, mcam_reg)) {
 		mlx5_get_mcam_access_reg_group(dev, MLX5_MCAM_REGS_FIRST_128);
 		mlx5_get_mcam_access_reg_group(dev, MLX5_MCAM_REGS_0x9100_0x917F);
+		mlx5_get_mcam_access_reg_group(dev, MLX5_MCAM_REGS_0x9180_0x91FF);
 	}
 
 	if (MLX5_CAP_GEN(dev, qcam_reg))

include/linux/mlx5/device.h

@@ -1243,7 +1243,8 @@ enum mlx5_pcam_feature_groups {
 enum mlx5_mcam_reg_groups {
 	MLX5_MCAM_REGS_FIRST_128                    = 0x0,
 	MLX5_MCAM_REGS_0x9100_0x917F                = 0x2,
-	MLX5_MCAM_REGS_NUM                          = 0x3,
+	MLX5_MCAM_REGS_0x9180_0x91FF                = 0x3,
+	MLX5_MCAM_REGS_NUM                          = 0x4,
 };
 
 enum mlx5_mcam_feature_groups {
@@ -1392,6 +1393,10 @@ enum mlx5_qcam_feature_groups {
 	MLX5_GET(mcam_reg, (mdev)->caps.mcam[MLX5_MCAM_REGS_0x9100_0x917F], \
 		 mng_access_reg_cap_mask.access_regs2.reg)
 
+#define MLX5_CAP_MCAM_REG3(mdev, reg) \
+	MLX5_GET(mcam_reg, (mdev)->caps.mcam[MLX5_MCAM_REGS_0x9180_0x91FF], \
+		 mng_access_reg_cap_mask.access_regs3.reg)
+
 #define MLX5_CAP_MCAM_FEATURE(mdev, fld) \
 	MLX5_GET(mcam_reg, (mdev)->caps.mcam, mng_feature_cap_mask.enhanced_features.fld)
 

include/linux/mlx5/driver.h

@@ -159,6 +159,8 @@ enum {
 	MLX5_REG_MSECQ		 = 0x9155,
 	MLX5_REG_MSEES		 = 0x9156,
 	MLX5_REG_MIRC		 = 0x9162,
+	MLX5_REG_MTPTM		 = 0x9180,
+	MLX5_REG_MTCTR		 = 0x9181,
 	MLX5_REG_SBCAM		 = 0xB01F,
 	MLX5_REG_RESOURCE_DUMP   = 0xC000,
 	MLX5_REG_DTOR            = 0xC00E,

include/linux/mlx5/mlx5_ifc.h

@@ -10401,6 +10401,18 @@ struct mlx5_ifc_mcam_access_reg_bits2 {
 	u8         regs_31_to_0[0x20];
 };
 
+struct mlx5_ifc_mcam_access_reg_bits3 {
+	u8         regs_127_to_96[0x20];
+
+	u8         regs_95_to_64[0x20];
+
+	u8         regs_63_to_32[0x20];
+
+	u8         regs_31_to_2[0x1e];
+	u8         mtctr[0x1];
+	u8         mtptm[0x1];
+};
+
 struct mlx5_ifc_mcam_reg_bits {
 	u8         reserved_at_0[0x8];
 	u8         feature_group[0x8];
@@ -10413,6 +10425,7 @@ struct mlx5_ifc_mcam_reg_bits {
 		struct mlx5_ifc_mcam_access_reg_bits access_regs;
 		struct mlx5_ifc_mcam_access_reg_bits1 access_regs1;
 		struct mlx5_ifc_mcam_access_reg_bits2 access_regs2;
+		struct mlx5_ifc_mcam_access_reg_bits3 access_regs3;
 		u8         reserved_at_0[0x80];
 	} mng_access_reg_cap_mask;
 
@@ -11166,6 +11179,34 @@ struct mlx5_ifc_mtmp_reg_bits {
 	u8         sensor_name_lo[0x20];
 };
 
+struct mlx5_ifc_mtptm_reg_bits {
+	u8         reserved_at_0[0x10];
+	u8         psta[0x1];
+	u8         reserved_at_11[0xf];
+
+	u8         reserved_at_20[0x60];
+};
+
+enum {
+	MLX5_MTCTR_REQUEST_NOP = 0x0,
+	MLX5_MTCTR_REQUEST_PTM_ROOT_CLOCK = 0x1,
+	MLX5_MTCTR_REQUEST_FREE_RUNNING_COUNTER = 0x2,
+	MLX5_MTCTR_REQUEST_REAL_TIME_CLOCK = 0x3,
+};
+
+struct mlx5_ifc_mtctr_reg_bits {
+	u8         first_clock_timestamp_request[0x8];
+	u8         second_clock_timestamp_request[0x8];
+	u8         reserved_at_10[0x10];
+
+	u8         first_clock_valid[0x1];
+	u8         second_clock_valid[0x1];
+	u8         reserved_at_22[0x1e];
+
+	u8         first_clock_timestamp[0x40];
+	u8         second_clock_timestamp[0x40];
+};
+
 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;
@@ -11230,6 +11271,8 @@ union mlx5_ifc_ports_control_registers_document_bits {
 	struct mlx5_ifc_mrtc_reg_bits mrtc_reg;
 	struct mlx5_ifc_mtcap_reg_bits mtcap_reg;
 	struct mlx5_ifc_mtmp_reg_bits mtmp_reg;
+	struct mlx5_ifc_mtptm_reg_bits mtptm_reg;
+	struct mlx5_ifc_mtctr_reg_bits mtctr_reg;
 	u8         reserved_at_0[0x60e0];
 };