MacchiatoBin SingleShot 2500BASE-X port (eth3) with GPON SFP on mvpp2x

[<marcmicalizzi@gmail.com>]

I’ve just been playing with the mcbin for a little while now, and this
kernel tree (mcbin branch) seems to be the only way (using a modern kernel)
I’ve found that actually gets the 10GB SFP ports working on the SingleShot. 

Unfortunately, however, the GPON SFP I have (Huawei MA5671, provided by my
ISP) does not seem to work on eth3 (mvpp2x driver). Currently I’m using it
successfully in a different machine using a Broadcom BCM57810S (bnx2x
warpcore) with a couple modifications to the driver to link at 2500BASE-X,
and support SC modules, but was hoping to move it over to the MacchiatoBin
and try it as a router.

Worth noting is one quirk of this SFP is that it does not have a physical
EEPROM, and instead has a soft EEPROM that takes some time to load after
powering.

On boot I receive: 
[    5.376559] sfp sfp-eth3: failed to read EEPROM: -6
Which also keeps posting to dmesg afterwards.

And with ethtool -m: 
# ethtool -m eth3
Cannot get Module EEPROM data: No such device or address

I also noticed from `ethtool eth3` that it does not explicitly list
2500Base-X as a supported link or advertisement mode with the SFP plugged,
and afterwards (otherwise it does):
mcbin # ethtool eth3
Settings for eth3:
        Supported ports: [ MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Speed: 10Mb/s
        Duplex: Half
        Port: MII
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Link detected: no

From the machine I have that does work with the SFP:
server # ethtool -m eth0
        Identifier                                : 0x03 (SFP)
        Extended identifier                       : 0x04 (GBIC/SFP defined
by 2-wire interface ID)
        Connector                                 : 0x01 (SC)
        Transceiver codes                         : 0x00 0x00 0x00 0x02 0x00
0x00 0x00 0x00
        Transceiver type                          : Ethernet: 1000BASE-LX
        Encoding                                  : 0x03 (NRZ)
        BR, Nominal                               : 1200MBd
        Rate identifier                           : 0x00 (unspecified)
        Length (SMF,km)                           : 20km
        Length (SMF)                              : 20000m
        Length (50um)                             : 0m
        Length (62.5um)                           : 0m
        Length (Copper)                           : 0m
        Length (OM3)                              : 0m
        Laser wavelength                          : 1310nm
        Vendor name                               : HUAWEI
        Vendor OUI                                : 00:00:00
        Vendor PN                                 : MA5671A
        Vendor rev                                : 0000
        Option values                             : 0x00 0x1a
        Option                                    : RX_LOS implemented
        Option                                    : TX_FAULT implemented
        Option                                    : TX_DISABLE implemented
        BR margin, max                            : 0%
        BR margin, min                            : 0%
        Vendor SN                                 : xxxxxxxxxxxxxxxxx
        Date code                                 : 180105
        Optical diagnostics support               : Yes
        Laser bias current                        : 8.058 mA
        Laser output power                        : 1.4902 mW / 1.73 dBm
        Receiver signal average optical power     : 0.0104 mW / -19.83 dBm
        Module temperature                        : 41.66 degrees C / 106.99
degrees F
        Module voltage                            : 3.2717 V
        Alarm/warning flags implemented           : Yes
        Laser bias current high alarm             : Off
        Laser bias current low alarm              : Off
        Laser bias current high warning           : Off
        Laser bias current low warning            : Off
        Laser output power high alarm             : Off
        Laser output power low alarm              : Off
        Laser output power high warning           : Off
        Laser output power low warning            : Off
        Module temperature high alarm             : Off
        Module temperature low alarm              : Off
        Module temperature high warning           : Off
        Module temperature low warning            : Off
        Module voltage high alarm                 : Off
        Module voltage low alarm                  : Off
        Module voltage high warning               : Off
        Module voltage low warning                : Off
        Laser rx power high alarm                 : Off
        Laser rx power low alarm                  : Off
        Laser rx power high warning               : Off
        Laser rx power low warning                : Off
        Laser bias current high alarm threshold   : 90.000 mA
        Laser bias current low alarm threshold    : 0.000 mA
        Laser bias current high warning threshold : 70.000 mA
        Laser bias current low warning threshold  : 0.000 mA
        Laser output power high alarm threshold   : 3.9810 mW / 6.00 dBm
        Laser output power low alarm threshold    : 0.8912 mW / -0.50 dBm
        Laser output power high warning threshold : 3.1622 mW / 5.00 dBm
        Laser output power low warning threshold  : 1.1220 mW / 0.50 dBm
        Module temperature high alarm threshold   : 95.00 degrees C / 203.00
degrees F
        Module temperature low alarm threshold    : -50.00 degrees C /
-58.00 degrees F
        Module temperature high warning threshold : 90.00 degrees C / 194.00
degrees F
        Module temperature low warning threshold  : -45.00 degrees C /
-49.00 degrees F
        Module voltage high alarm threshold       : 3.6000 V
        Module voltage low alarm threshold        : 3.0000 V
        Module voltage high warning threshold     : 3.5000 V
        Module voltage low warning threshold      : 3.1000 V
        Laser rx power high alarm threshold       : 0.2511 mW / -6.00 dBm
        Laser rx power low alarm threshold        : 0.0013 mW / -28.86 dBm
        Laser rx power high warning threshold     : 0.1995 mW / -7.00 dBm
        Laser rx power low warning threshold      : 0.0016 mW / -27.96 dBm
server # ethtool eth0
Settings for eth0:
        Supported ports: [ FIBRE ]
        Supported link modes:   1000baseT/Full
                                2500baseX/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: No
        Advertised link modes:  2500baseX/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Speed: 2500Mb/s
        Duplex: Full
        Port: FIBRE
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: off
        Supports Wake-on: g
        Wake-on: d
        Current message level: 0x00000000 (0)

        Link detected: yes

If you have any ideas or can provide any direction, I would greatly
appreciate it.

Thanks,
Marc

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