On 11/02/2017 09:10 AM, Andrew Lunn wrote:
> On Thu, Nov 02, 2017 at 08:55:33AM -0700, David Daney wrote:
>> On 11/02/2017 05:43 AM, Andrew Lunn wrote:
>> [...]
>>>> +
>>>> + i = atomic_inc_return(&pki_id);
>>>> + pki_dev = platform_device_register_data(&new_dev->dev,
>>>> + is_mix ? "octeon_mgmt" : "ethernet-mac-pki",
>>>> + i, &platform_data, sizeof(platform_data));
>>>> + dev_info(&pdev->dev, "Created %s %u: %p\n",
>>>> + is_mix ? "MIX" : "PKI", pki_dev->id, pki_dev);
>>>
>>> Is there any change of these ethernet ports being used to connect to
>>> an Ethernet switch. We have had issues in the past with these sort of
>>> platform devices combined with DSA.
>>>
>>
>> There are only two possibilities. The BGX MACs have a multiplexer that
>> allows them to be connected to either the "octeon_mgmt" MIX packet
>> processor, or to the "ethernet-mac-pki" PKI/PKO packet processor. The SoCs
>> supported by these drivers do not contain any hardware that would be
>> considered an "Ethernet switch".
>
> Hi David
>
> I was thinking of an external Ethernet switch. You generally connect
> via RGMII to a port of the switch.
>
OK, now I think I understand. Yes, the MAC can be hardwired to a
switch. In fact, there are system designs that do exactly that.
We try to handle this case by not having a "phy-handle" property in the
device tree. The link to the remote device (switch IC in this case) is
brought up on ndo_open()
There may be opportunities to improve how this works in the future, but
the current code is serviceable.
> http://elixir.free-electrons.com/linux/v4.9.60/source/Documentation/networking/dsa/dsa.txt
>
> Andrew
>
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