net/mlx5e: Return a valid errno if can't get lag device index

Change the return value to -ENOENT, to make it more meaningful.
Signed-off-by: NJianbo Liu <jianbol@mellanox.com>
Reviewed-by: NJiri Pirko <jiri@nvidia.com>
Signed-off-by: NSaeed Mahameed <saeedm@nvidia.com>

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

@@ -102,7 +102,7 @@ int mlx5_lag_dev_get_netdev_idx(struct mlx5_lag *ldev,
 		if (ldev->pf[i].netdev == ndev)
 			return i;
 
-	return -1;
+	return -ENOENT;
 }
 
 static bool __mlx5_lag_is_roce(struct mlx5_lag *ldev)
@@ -374,7 +374,7 @@ static int mlx5_handle_changeupper_event(struct mlx5_lag *ldev,
 	rcu_read_lock();
 	for_each_netdev_in_bond_rcu(upper, ndev_tmp) {
 		idx = mlx5_lag_dev_get_netdev_idx(ldev, ndev_tmp);
-		if (idx > -1)
+		if (idx >= 0)
 			bond_status |= (1 << idx);
 
 		num_slaves++;
@@ -418,7 +418,7 @@ static int mlx5_handle_changelowerstate_event(struct mlx5_lag *ldev,
 		return 0;
 
 	idx = mlx5_lag_dev_get_netdev_idx(ldev, ndev);
-	if (idx == -1)
+	if (idx < 0)
 		return 0;
 
 	/* This information is used to determine virtual to physical

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

@@ -131,7 +131,12 @@ static void mlx5_lag_fib_route_event(struct mlx5_lag *ldev,
 			struct net_device *nh_dev = nh->fib_nh_dev;
 			int i = mlx5_lag_dev_get_netdev_idx(ldev, nh_dev);
 
-			mlx5_lag_set_port_affinity(ldev, ++i);
+			if (i < 0)
+				i = MLX5_LAG_NORMAL_AFFINITY;
+			else
+				++i;
+
+			mlx5_lag_set_port_affinity(ldev, i);
 		}
 		return;
 	}