netdev - Re: Marvell 88E609x switch?

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Date:	Fri, 27 Feb 2009 07:55:29 -0700
From:	Gary Thomas <gary@...assoc.com>
To:	Lennert Buytenhek <buytenh@...tstofly.org>
CC:	netdev@...r.kernel.org
Subject: Re: Marvell 88E609x switch?

Lennert Buytenhek wrote:
> On Fri, Feb 27, 2009 at 07:36:07AM -0700, Gary Thomas wrote:
> 
>>>>>>> Also, can you show me what you're filling the dsa platform data
>>>>>>> structure with?
>>>>>> struct dsa_platform_data _switch_data = {
>>>>>>     .port_names[0]  = "lan1.1",
>>>>>>     .port_names[1]  = "lan1.2",
>>>>>>     .port_names[2]  = "lan1.3",
>>>>>>     .port_names[3]  = "lan1.4",
>>>>>>     .port_names[4]  = "lan1.5",
>>>>>>     .port_names[5]  = "lan1.6",
>>>>>>     .port_names[6]  = "lan1.7",
>>>>>>     .port_names[7]  = "lan1.8",
>>>>>>     .port_names[10]  = "cpu",
>>>>>>     .sw_addr = 1,
>>>>>> };
>>>>> Just this should do the trick.  So what's not working -- are the
>>>>> interfaces not showing up?  Or packet RX/TX isn't working?  Or
>>>>> something else?
>>>> It won't let me bring up eth0 (my scripts try to run DHCP):
>>>>   starting network interfaces...
>>>>   24520:01 not found
>>>>   eth0: Could not attach to PHY
>>>>   ip: SIOCSIFFLAGS: No such device
>>>>
>>>> As for the other devices, they do show up if I let eth0 try to
>>>> attach to the PHY:
>>> OK.  If you try to cheat the gianfar driver by having it attach to
>>> the PHY for lan1.1, and plug a network cable into lan1.1 so that the
>>> link goes up and gianfar thinks that the link on eth0 is up, does that
>>> enable you to pass packets over any of the switch interfaces?  That
>>> should be working now in this stage.
>> So, what name do I use when the gianfar is trying to attach?
>> It makes this call:
>>   phydev = phy_connect(dev, phy_id, &adjust_link, 0, interface);
>> where phy_id="24520:01".
>>
>> Using "24520:01:00" gets an error:
>>   eth0: 24520:01:00 already attached
>>
>> Maybe the DSA layer/driver needs to export a device "24520:01"
>> which pretends all of the things that the gianfar wants (1000Mb/Full/Link)?
> 
> Well, this isn't DSA-specific -- e.g. if you'd hook your CPU's
> ethernet MAC up to an FPGA, you'd be in the same situation.
> 
> Maybe there is some fake PHY you can instantiate -- the "Fixed"
> MDIO bus maybe?  Can you try enabling CONFIG_FIXED_PHY and pointing
> it to that?

OK, I did that:
  Sending discover...
  PHY: 0:01 - Link is Up - 1000/Full

I now see the fixed PHY (pretender, configured at build time)
and the 8 LAN sockets:
  root@..._target:~ ls /sys/bus/mdio_bus/devices/
  0:01         24520:01:01  24520:01:03  24520:01:05  24520:01:07
  24520:01:00  24520:01:02  24520:01:04  24520:01:06

But nothing seems to get through the switch.  Of course, I
know that the switch and connections are working because that's
the path I downloaded/booted the kernel from.

Getting closer :-) Any ideas?

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------
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