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

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Date:   Sun, 11 Aug 2019 21:20:05 +0000
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>
Subject: Re: [PATCH] dpaa2-ethsw: move the DPAA2 Ethernet Switch driver out of
 staging

On 8/11/19 6:22 AM, Andrew Lunn wrote:
> 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.
> 

Let me make a distinction here: we do no support multiple bridges on the 
same DPSW object but we do support multiple DPSW objects, each with its 
bridge.


> Are there any plans to fix this?
> 

We had some internal discussions on this, the hardware could support 
this kind of further partitioning the switch object but, at the moment, 
the firmware doesn't.

> Thanks
> 	Andrew
>