[Macchiato] SFP+ ports - any config needed?

[Baruch Siach]

Hi Steve,

Steve McIntyre writes:
> On Sun, Dec 16, 2018 at 01:21:30PM +0200, Baruch Siach wrote:
>>Steve McIntyre writes:
>>> I've just got a new switch with some 10G SFP+ ports on it, and I'm
>>> trying to use it with my macchiatobin, with some simple SFP+ direct
>>> attach cables.
>>>
>>> Naively, I just plugged things together and hoped for the best. *grin*
>>> But I don't seem to be getting any link on my cable. I don't see any
>>> obvious way of configuring the two 10G ports to use the SFP+ cages
>>> rather than the RJ45 TP connectors. Can somebody tell me what I'm
>>> missing please? Marcin?
>>
>>Which kernel version are you using?
>
> Debian's 4.18 backports kernel, which is "4.18.6-1~bpo9+1".
>
>>Do you have CONFIG_SFP and CONFIG_MARVELL_10G_PHY enabled?
>
> Yup.

Then you should at least see the sfp driver messages.

What is the revision of your Macchiatobin? Note that revision 1.1 has a
hardware bug that prevents i2c access to the SFP module EEPROM. You need
this workaround from the RMK git tree:

  http://git.armlinux.org.uk/cgit/linux-arm.git/commit/?h=mcbin&id=56da2dda3921fe927e683c211526417d03836dba

You also need to enable CONFIG_I2C_GPIO to make the workaround work.

baruch

>>You might need kernel commit 01b3fd5ac97c ("net: mvpp2: fix detection of
>>10G SFP modules") from v4.20-rc6 for 10G configuration.
>
> Hmm, OK. Will take a look.
>
>>To the best of my knowledge the 10G PHY automatically selects the active
>>port between copper and SFP.
>
> OK, cool. I was a little thrown by ethtool not showing anything under
> supported ports for the 10G SFP+ ports, but showing odd settings for
> the others:
>
> root at mjolnir:/lib/modules# ethtool eth0 | grep "Supported ports"
>         Supported ports: [ ]
> root at mjolnir:/lib/modules# ethtool eth1 | grep "Supported ports"
>         Supported ports: [ ]
> root at mjolnir:/lib/modules# ethtool eth2 | grep "Supported ports"
>         Supported ports: [ TP MII FIBRE ]
> root at mjolnir:/lib/modules# ethtool eth3 | grep "Supported ports"
>         Supported ports: [ MII ]
>
> Whereas on other machines with SFP+ I see FIBRE, and more sensible
> looking options elswhere:
>
> root at mustang3:/home/steve# ethtool eth0 | grep "Supported ports"
>         Supported ports: [ TP MII ]
> root at mustang3:/home/steve# ethtool eth1 | grep "Supported ports"
>         Supported ports: [ TP MII ]
> root at mustang3:/home/steve# ethtool eth2 | grep "Supported ports"
>         Supported ports: [ TP MII ]
> root at mustang3:/home/steve# ethtool eth3 | grep "Supported ports"
>         Supported ports: [ FIBRE ]


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