- Why I did it
ethtool print error logs when EEPROM of a SFP is not available. It prints error like this:
INFO pmon#/supervisord: xcvrd Cannot get module EEPROM information: Input/output error
INFO pmon#/supervisord: xcvrd Cannot get Module EEPROM data: Invalid argument
However, this log does not contain the relevant SFP index which is hard for developer/qa to find the exactly SFP.
- How I did it
Redirect ethtool stderr to subprocess and log it better
- How to verify it
Manual test
5ecb93f7e8