Subject: Re: [PATCH] dpaa2-ethsw: move the DPAA2 Ethernet Switch driver out of staging

From: Andrew Lunn <[email-masked]>
Date: Sun, 11 Aug 2019 05:22:35 +0200

Hi Ioana

>  >> +	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
>  >> +	struct ethsw_core *ethsw = port_priv->ethsw_data;
>  >> +	int i, err;
>  >> +
>  >> +	for (i = 0; i < ethsw->sw_attr.num_ifs; i++)
>  >> +		if (ethsw->ports[i]->bridge_dev &&
>  >> +		    (ethsw->ports[i]->bridge_dev != upper_dev)) {
>  >> +			netdev_err(netdev,
>  >> +				   "Another switch port is connected to %s\n",
>  >> +				   ethsw->ports[i]->bridge_dev->name);
>  >> +			return -EINVAL;
>  >> +		}
>  >
>  > Am i reading this correct? You only support a single bridge?  The
>  > error message is not very informative. Also, i think you should be
>  > returning EOPNOTSUPP, indicating the offload is not possible. Linux
>  > will then do it in software. If it could actually receive/transmit the
>  > frames....
>  >
> 
> Yes, we only support a single bridge.

That is a pretty severe restriction for a device of this class. Some
of the very simple switches DSA support have a similar restriction,
but in general, most do support multiple bridges.

Are there any plans to fix this?

Thanks
	Andrew