net/mlx5: detect and enable bypass port select flow table

Use port selection capability port_select_flow_table_bypass
bit to detect and enable explicit port affinity even when
in lag hash mode.
Signed-off-by: Liu, Changcheng <jerrliu@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -652,6 +652,33 @@ static int handle_hca_cap_roce(struct mlx5_core_dev *dev, void *set_ctx)
 	return err;
 }
 
+static int handle_hca_cap_port_selection(struct mlx5_core_dev *dev,
+					 void *set_ctx)
+{
+	void *set_hca_cap;
+	int err;
+
+	if (!MLX5_CAP_GEN(dev, port_selection_cap))
+		return 0;
+
+	err = mlx5_core_get_caps(dev, MLX5_CAP_PORT_SELECTION);
+	if (err)
+		return err;
+
+	if (MLX5_CAP_PORT_SELECTION(dev, port_select_flow_table_bypass) ||
+	    !MLX5_CAP_PORT_SELECTION_MAX(dev, port_select_flow_table_bypass))
+		return 0;
+
+	set_hca_cap = MLX5_ADDR_OF(set_hca_cap_in, set_ctx, capability);
+	memcpy(set_hca_cap, dev->caps.hca[MLX5_CAP_PORT_SELECTION]->cur,
+	       MLX5_ST_SZ_BYTES(port_selection_cap));
+	MLX5_SET(port_selection_cap, set_hca_cap, port_select_flow_table_bypass, 1);
+
+	err = set_caps(dev, set_ctx, MLX5_SET_HCA_CAP_OP_MODE_PORT_SELECTION);
+
+	return err;
+}
+
 static int set_hca_cap(struct mlx5_core_dev *dev)
 {
 	int set_sz = MLX5_ST_SZ_BYTES(set_hca_cap_in);
@@ -696,6 +723,13 @@ static int set_hca_cap(struct mlx5_core_dev *dev)
 		goto out;
 	}
 
+	memset(set_ctx, 0, set_sz);
+	err = handle_hca_cap_port_selection(dev, set_ctx);
+	if (err) {
+		mlx5_core_err(dev, "handle_hca_cap_port_selection failed\n");
+		goto out;
+	}
+
 out:
 	kfree(set_ctx);
 	return err;