/etc/fcoe/cfg-ethx is in fcoe-utils 1.0.9-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | ## Type: yes/no
## Default: no
# Enable/Disable FCoE service at the Ethernet port
FCOE_ENABLE="no"
## Type: yes/no
## Default: yes
# Indicate if DCB service is required at the Ethernet port
DCB_REQUIRED="yes"
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