Re: [PATCH net 4/6] net/mlx5: Lag, Check shared fdb before creating MultiPort E-Switch

[Michal Swiatkowski <michal.swiatkowski@linux.intel.com>]

On Tue, Mar 11, 2025 at 12:01:42AM +0200, Tariq Toukan wrote:
> From: Shay Drory <shayd@nvidia.com>
> 
> Currently, MultiPort E-Switch is requesting to create a LAG with shared
> FDB without checking the LAG is supporting shared FDB.
> Add the check.
> 
> Fixes: a32327a3a02c ("net/mlx5: Lag, Control MultiPort E-Switch single FDB mode")
> Signed-off-by: Shay Drory <shayd@nvidia.com>
> Reviewed-by: Mark Bloch <mbloch@nvidia.com>
> Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c   | 4 ++--
>  drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h   | 1 +
>  drivers/net/ethernet/mellanox/mlx5/core/lag/mpesw.c | 3 ++-
>  3 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
> index cea5aa314f6c..ed2ba272946b 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
> @@ -951,7 +951,7 @@ void mlx5_disable_lag(struct mlx5_lag *ldev)
>  				mlx5_eswitch_reload_ib_reps(ldev->pf[i].dev->priv.eswitch);
>  }
>  
> -static bool mlx5_shared_fdb_supported(struct mlx5_lag *ldev)
> +bool mlx5_lag_shared_fdb_supported(struct mlx5_lag *ldev)
>  {
>  	int idx = mlx5_lag_get_dev_index_by_seq(ldev, MLX5_LAG_P1);
>  	struct mlx5_core_dev *dev;
> @@ -1038,7 +1038,7 @@ static void mlx5_do_bond(struct mlx5_lag *ldev)
>  	}
>  
>  	if (do_bond && !__mlx5_lag_is_active(ldev)) {
> -		bool shared_fdb = mlx5_shared_fdb_supported(ldev);
> +		bool shared_fdb = mlx5_lag_shared_fdb_supported(ldev);
>  
>  		roce_lag = mlx5_lag_is_roce_lag(ldev);
>  
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h
> index 01cf72366947..c2f256bb2bc2 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h
> @@ -92,6 +92,7 @@ mlx5_lag_is_ready(struct mlx5_lag *ldev)
>  	return test_bit(MLX5_LAG_FLAG_NDEVS_READY, &ldev->state_flags);
>  }
>  
> +bool mlx5_lag_shared_fdb_supported(struct mlx5_lag *ldev);
>  bool mlx5_lag_check_prereq(struct mlx5_lag *ldev);
>  void mlx5_modify_lag(struct mlx5_lag *ldev,
>  		     struct lag_tracker *tracker);
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/mpesw.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/mpesw.c
> index ffac0bd6c895..1770297a112e 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/lag/mpesw.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/mpesw.c
> @@ -83,7 +83,8 @@ static int enable_mpesw(struct mlx5_lag *ldev)
>  	if (mlx5_eswitch_mode(dev0) != MLX5_ESWITCH_OFFLOADS ||
>  	    !MLX5_CAP_PORT_SELECTION(dev0, port_select_flow_table) ||
>  	    !MLX5_CAP_GEN(dev0, create_lag_when_not_master_up) ||
> -	    !mlx5_lag_check_prereq(ldev))
> +	    !mlx5_lag_check_prereq(ldev) ||
> +	    !mlx5_lag_shared_fdb_supported(ldev))
>  		return -EOPNOTSUPP;
>  
>  	err = mlx5_mpesw_metadata_set(ldev);

Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>

> -- 
> 2.31.1