net/mlx5: LAG, block multipath LAG in case ldev have more than 2 ports

multipath LAG is not supported over more than two ports. Add a check in
order to block multipath LAG over such configurations.
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c

@@ -14,6 +14,7 @@ static bool __mlx5_lag_is_multipath(struct mlx5_lag *ldev)
 	return ldev->mode == MLX5_LAG_MODE_MULTIPATH;
 }
 
+#define MLX5_LAG_MULTIPATH_OFFLOADS_SUPPORTED_PORTS 2
 static bool mlx5_lag_multipath_check_prereq(struct mlx5_lag *ldev)
 {
 	if (!mlx5_lag_is_ready(ldev))
@@ -22,6 +23,9 @@ static bool mlx5_lag_multipath_check_prereq(struct mlx5_lag *ldev)
 	if (__mlx5_lag_is_active(ldev) && !__mlx5_lag_is_multipath(ldev))
 		return false;
 
+	if (ldev->ports > MLX5_LAG_MULTIPATH_OFFLOADS_SUPPORTED_PORTS)
+		return false;
+
 	return mlx5_esw_multipath_prereq(ldev->pf[MLX5_LAG_P1].dev,
 					 ldev->pf[MLX5_LAG_P2].dev);
 }