Re: [PATCH net-next 3/9] mlxsw: spectrum: Check bridge flags during prepare phase

[Ido Schimmel <idosch@mellanox.com>]

On Wed, Feb 13, 2019 at 02:06:32PM -0800, Florian Fainelli wrote:
> In preparation for getting rid of switchdev_port_attr_get(), have mlxsw
> check for the bridge flags being set through switchdev_port_attr_set()
> when the SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS attribute identifier is
> used.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
>  .../ethernet/mellanox/mlxsw/spectrum_switchdev.c   | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
> index 1f492b7dbea8..7616eab50035 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
> @@ -598,13 +598,17 @@ mlxsw_sp_bridge_port_learning_set(struct mlxsw_sp_port *mlxsw_sp_port,
>  static int mlxsw_sp_port_attr_br_flags_set(struct mlxsw_sp_port *mlxsw_sp_port,
>  					   struct switchdev_trans *trans,
>  					   struct net_device *orig_dev,
> -					   unsigned long brport_flags)
> +					   unsigned long brport_flags,
> +					   bool pre_set)
>  {
>  	struct mlxsw_sp_bridge_port *bridge_port;
>  	int err;
>  
> -	if (switchdev_trans_ph_prepare(trans))
> +	if (switchdev_trans_ph_prepare(trans) && pre_set) {
> +		if (brport_flags & ~(BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD))
> +			return -EOPNOTSUPP;
>  		return 0;
> +	}

When we get SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS we only want to
perform a check. With this code in case it's not prepare phase, then we
continue to set the flags. Better do:

if (pre_set) {
	if (switchdev_trans_ph_commit(trans))
		return 0;
	// perform check here
}

>  
>  	bridge_port = mlxsw_sp_bridge_port_find(mlxsw_sp_port->mlxsw_sp->bridge,
>  						orig_dev);
> @@ -833,6 +837,7 @@ static int mlxsw_sp_port_attr_set(struct net_device *dev,
>  				  struct switchdev_trans *trans)
>  {
>  	struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
> +	bool pre_set = false;
>  	int err;
>  
>  	switch (attr->id) {
> @@ -841,10 +846,13 @@ static int mlxsw_sp_port_attr_set(struct net_device *dev,
>  						       attr->orig_dev,
>  						       attr->u.stp_state);
>  		break;
> +	case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
> +		pre_set = true;	/* fall through */
>  	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
>  		err = mlxsw_sp_port_attr_br_flags_set(mlxsw_sp_port, trans,
>  						      attr->orig_dev,
> -						      attr->u.brport_flags);
> +						      attr->u.brport_flags,
> +						      pre_set);
>  		break;
>  	case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
>  		err = mlxsw_sp_port_attr_br_ageing_set(mlxsw_sp_port, trans,
> -- 
> 2.17.1
>