With this SRU, "Optical diagnostics support" and all the fields below it
can be displayed normally:

openstack@lc2bp-vscp0010n:~$ sudo ethtool -m ens15f0
        Identifier                                : 0x03 (SFP)
        Extended identifier                       : 0x04 (GBIC/SFP defined by 
2-wire interface ID)
        Connector                                 : 0x07 (LC)
        Transceiver codes                         : 0x10 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00
        Transceiver type                          : 10G Ethernet: 10G Base-SR
        Encoding                                  : 0x06 (64B/66B)
        BR, Nominal                               : 10300MBd
        Rate identifier                           : 0x00 (unspecified)
        Length (SMF,km)                           : 0km
        Length (SMF)                              : 0m
        Length (50um)                             : 80m
        Length (62.5um)                           : 30m
        Length (Copper)                           : 0m
        Length (OM3)                              : 300m
        Laser wavelength                          : 850nm
        Vendor name                               : FINISAR CORP.
        Vendor OUI                                : 00:90:65
        Vendor PN                                 : FTLX8574D3BCL
        Vendor rev                                : A
        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                                 : A46BS57
        Date code                                 : 200811
        Optical diagnostics support               : Yes          
<<================ display correctly
        Laser bias current                        : 9.392 mA
        Laser output power                        : 0.5396 mW / -2.68 dBm
        Receiver signal average optical power     : 0.6201 mW / -2.08 dBm
        Module temperature                        : 47.54 degrees C / 117.58 
degrees F
        Module voltage                            : 3.4322 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   : 13.000 mA
        Laser bias current low alarm threshold    : 4.000 mA
        Laser bias current high warning threshold : 12.500 mA
        Laser bias current low warning threshold  : 5.000 mA
        Laser output power high alarm threshold   : 1.0000 mW / 0.00 dBm
        Laser output power low alarm threshold    : 0.2512 mW / -6.00 dBm
        Laser output power high warning threshold : 0.7943 mW / -1.00 dBm
        Laser output power low warning threshold  : 0.3162 mW / -5.00 dBm
        Module temperature high alarm threshold   : 78.00 degrees C / 172.40 
degrees F
        Module temperature low alarm threshold    : -13.00 degrees C / 8.60 
degrees F
        Module temperature high warning threshold : 73.00 degrees C / 163.40 
degrees F
        Module temperature low warning threshold  : -8.00 degrees C / 17.60 
degrees F
        Module voltage high alarm threshold       : 3.7000 V
        Module voltage low alarm threshold        : 2.9000 V
        Module voltage high warning threshold     : 3.6000 V
        Module voltage low warning threshold      : 3.0000 V
        Laser rx power high alarm threshold       : 1.0000 mW / 0.00 dBm
        Laser rx power low alarm threshold        : 0.0100 mW / -20.00 dBm
        Laser rx power high warning threshold     : 0.7943 mW / -1.00 dBm
        Laser rx power low warning threshold      : 0.0158 mW / -18.01 dBm
openstack@lc2bp-vscp0010n:~$

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https://bugs.launchpad.net/bugs/2100246

Title:
  ethtool module info missing sff-8472 output in netlink path

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