netdev - Re: [PATCH net] net: dsa: mv88e6xxx: Set correct interface mode for CPU/DSA ports

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Date:   Mon, 27 May 2019 11:26:55 +1000
From:   Greg Ungerer <gerg@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net: dsa: mv88e6xxx: Set correct interface mode for
 CPU/DSA ports

Hi Andrew,

Thanks for the quick response.


On 24/5/19 11:44 pm, Andrew Lunn wrote:
> On Fri, May 24, 2019 at 11:25:03AM +1000, Greg Ungerer wrote:
>> Hi Andrew,
>>
>> I have a problem with a Marvell 6390 switch that I have bisected
>> back to commit 7cbbee050c95, "[PATCH] net: dsa: mv88e6xxx: Set correct
>> interface mode for CPU/DSA ports".
>>
>> I have a Marvell 380 SoC based platform with a Marvell 6390 10 port
>> switch, everything works with kernel 5.0 and older. As of 5.1 the
>> switch ports no longer work - no packets are ever received and
>> none get sent out.
>>
>> The ports are probed and all discovered ok, they just don't work.
>>
>>    mv88e6085 f1072004.mdio-mii:10: switch 0x3900 detected: Marvell 88E6390, revision 1
>>    libphy: mv88e6xxx SMI: probed
>>    mv88e6085 f1072004.mdio-mii:10 lan1 (uninitialized): PHY [mv88e6xxx-1:01] driver [Marvell 88E6390]
>>    mv88e6085 f1072004.mdio-mii:10 lan2 (uninitialized): PHY [mv88e6xxx-1:02] driver [Marvell 88E6390]
>>    mv88e6085 f1072004.mdio-mii:10 lan3 (uninitialized): PHY [mv88e6xxx-1:03] driver [Marvell 88E6390]
>>    mv88e6085 f1072004.mdio-mii:10 lan4 (uninitialized): PHY [mv88e6xxx-1:04] driver [Marvell 88E6390]
>>    mv88e6085 f1072004.mdio-mii:10 lan5 (uninitialized): PHY [mv88e6xxx-1:05] driver [Marvell 88E6390]
>>    mv88e6085 f1072004.mdio-mii:10 lan6 (uninitialized): PHY [mv88e6xxx-1:06] driver [Marvell 88E6390]
>>    mv88e6085 f1072004.mdio-mii:10 lan7 (uninitialized): PHY [mv88e6xxx-1:07] driver [Marvell 88E6390]
>>    mv88e6085 f1072004.mdio-mii:10 lan8 (uninitialized): PHY [mv88e6xxx-1:08] driver [Marvell 88E6390]
>>    DSA: tree 0 setup
>>
>> Things like ethtool on the ports seem to work ok, reports link correctly.
>> Configuring ports as part of a bridge or individually gets the same result.
> 
> Hi Greg
> 
> DSA by default should configure the CPU port and DSA ports to there
> maximum speed. For port 10, that is 10Gbps. Your 380 cannot do that
> speed. So you need to tell the switch driver to slow down. Add a fixed
> link node to port ten, with speed 1000. You might also need to set the
> phy-mode to rgmii.

My hardware has the CPU port on 9, and it is SGMII. The existing working
devicetree setup I used is:

                        port@9 {
                                 reg = <9>;
                                 label = "cpu";
                                 ethernet = <&eth0>;
                                 fixed-link {
                                         speed = <1000>;
                                         full-duplex;
                                 };
                         };


> Can the 380 do 2500BaseX? There is work in progress to support this
> speed, so maybe next cycle you can change to that.

That would be nice.

Regards
Greg