Package: ethtool
Version: 1:4.19-1
Severity: important
The command ethtool -m <interface> is unable to read the transceiver DOM values.
Here is a transcript:
root@localhost:~# ethtool -i ens2f0
driver: mlx5_core
version: 5.0-0
firmware-version: 14.25.8000 (DEL2420110034)
expansion-rom-version:
bus-info: 0000:65:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: yes
root@localhost:~# ethtool -m ens2f0
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) : 20m
Length (Copper) : 0m
Length (OM3) : 300m
Laser wavelength : 850nm
Vendor name : Pureoptics
Vendor OUI : 00:00:00
Vendor PN : EX-SFP-10GE-SR
Vendor rev : B4
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 : M4787212
Date code : 200222
Optical diagnostics support : Yes
Laser bias current : 0.000 mA
Laser output power : 0.0000 mW / -inf dBm
Receiver signal average optical power : 0.0000 mW / -inf dBm
Module temperature : 0.00 degrees C / 32.00 degrees F
Module voltage : 0.0000 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 : 0.000 mA
Laser bias current low alarm threshold : 0.000 mA
Laser bias current high warning threshold : 0.000 mA
Laser bias current low warning threshold : 0.000 mA
Laser output power high alarm threshold : 0.0000 mW / -inf dBm
Laser output power low alarm threshold : 0.0000 mW / -inf dBm
Laser output power high warning threshold : 0.0000 mW / -inf dBm
Laser output power low warning threshold : 0.0000 mW / -inf dBm
Module temperature high alarm threshold : 0.00 degrees C / 32.00 degrees F
Module temperature low alarm threshold : 0.00 degrees C / 32.00 degrees F
Module temperature high warning threshold : 0.00 degrees C / 32.00 degrees F
Module temperature low warning threshold : 0.00 degrees C / 32.00 degrees F
Module voltage high alarm threshold : 0.0000 V
Module voltage low alarm threshold : 0.0000 V
Module voltage high warning threshold : 0.0000 V
Module voltage low warning threshold : 0.0000 V
Laser rx power high alarm threshold : 0.0000 mW / -inf dBm
Laser rx power low alarm threshold : 0.0000 mW / -inf dBm
Laser rx power high warning threshold : 0.0000 mW / -inf dBm
Laser rx power low warning threshold : 0.0000 mW / -inf dBm
As you can see all mesuring values are zeros.
I am using Debian GNU/Linux 10 (buster), kernel 4.19.0-9-amd64 #1 SMP Debian 4.19.118-2 (2020-04-29) x86_64 GNU/Linux and libc6 2.28-10
FYI, I get correct values using SystemRescueCD 6 (ethtool 5.0, kernel 4.19.34-1-lts) on this same hardware, using the same command.
Regards,