net/mlx5: Lag, store number of ports inside lag object

Store the number of lag ports inside the lag object. Lag object is a single
shared object managing the lag state of multiple mlx5 devices on the same
physical HCA.

Downstream patches will allow hardware lag to be created over devices with
more than 2 ports.
Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Maor Gottlieb <maorg@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -164,6 +164,7 @@ static struct mlx5_lag *mlx5_lag_dev_alloc(struct mlx5_core_dev *dev)
 	if (err)
 		mlx5_core_err(dev, "Failed to init multipath lag err=%d\n",
 			      err);
+	ldev->ports = MLX5_CAP_GEN(dev, num_lag_ports);
 
 	return ldev;
 }

drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h

@@ -45,6 +45,7 @@ struct lag_tracker {
  */
 struct mlx5_lag {
 	u8                        flags;
+	u8			  ports;
 	int			  mode_changes_in_progress;
 	bool			  shared_fdb;
 	u8                        v2p_map[MLX5_MAX_PORTS];