net/mlx5: Add DCBX firmware commands support

Add set/query commands for DCBX_PARAM register
Signed-off-by: Huy Nguyen <huyn@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -548,6 +548,26 @@ int mlx5_max_tc(struct mlx5_core_dev *mdev)
 	return num_tc - 1;
 }
 
+int mlx5_query_port_dcbx_param(struct mlx5_core_dev *mdev, u32 *out)
+{
+	u32 in[MLX5_ST_SZ_DW(dcbx_param)] = {0};
+
+	MLX5_SET(dcbx_param, in, port_number, 1);
+
+	return  mlx5_core_access_reg(mdev, in, sizeof(in), out,
+				    sizeof(in), MLX5_REG_DCBX_PARAM, 0, 0);
+}
+
+int mlx5_set_port_dcbx_param(struct mlx5_core_dev *mdev, u32 *in)
+{
+	u32 out[MLX5_ST_SZ_DW(dcbx_param)];
+
+	MLX5_SET(dcbx_param, in, port_number, 1);
+
+	return mlx5_core_access_reg(mdev, in, sizeof(out), out,
+				    sizeof(out), MLX5_REG_DCBX_PARAM, 0, 1);
+}
+
 int mlx5_set_port_prio_tc(struct mlx5_core_dev *mdev, u8 *prio_tc)
 {
 	u32 in[MLX5_ST_SZ_DW(qtct_reg)] = {0};

include/linux/mlx5/driver.h

@@ -104,6 +104,8 @@ enum {
 enum {
 	MLX5_REG_QETCR		 = 0x4005,
 	MLX5_REG_QTCT		 = 0x400a,
+	MLX5_REG_DCBX_PARAM      = 0x4020,
+	MLX5_REG_DCBX_APP        = 0x4021,
 	MLX5_REG_PCAP		 = 0x5001,
 	MLX5_REG_PMTU		 = 0x5003,
 	MLX5_REG_PTYS		 = 0x5004,
@@ -124,6 +126,11 @@ enum {
 	MLX5_REG_MPCNT		 = 0x9051,
 };
 
+enum mlx5_dcbx_oper_mode {
+	MLX5E_DCBX_PARAM_VER_OPER_HOST  = 0x0,
+	MLX5E_DCBX_PARAM_VER_OPER_AUTO  = 0x3,
+};
+
 enum {
 	MLX5_ATOMIC_OPS_CMP_SWAP	= 1 << 0,
 	MLX5_ATOMIC_OPS_FETCH_ADD	= 1 << 1,

include/linux/mlx5/port.h

@@ -162,4 +162,6 @@ void mlx5_query_port_fcs(struct mlx5_core_dev *mdev, bool *supported,
 int mlx5_query_module_eeprom(struct mlx5_core_dev *dev,
 			     u16 offset, u16 size, u8 *data);
 
+int mlx5_query_port_dcbx_param(struct mlx5_core_dev *mdev, u32 *out);
+int mlx5_set_port_dcbx_param(struct mlx5_core_dev *mdev, u32 *in);
 #endif /* __MLX5_PORT_H__ */