New files:
net/ethtool/cmis_loopback.c
net/ethtool/loopback.c

Modified files:
include/linux/ethtool.h
net/ethtool/netlink.h
net/ethtool/netlink.c
include/uapi/linux/ethtool_netlink_generated.h
net/ethtool/Makefile
drivers/net/netdevsim/netdevsim.h
MAINTAINERS
net/ethtool/plca.c
drivers/net/netdevsim/ethtool.c
net/ethtool/mse.c
net/ethtool/pse-pd.c
net/ethtool/phy.c

Checking coverage for a new file: net/ethtool/cmis_loopback.c
  Section NETWORKING [ETHTOOL LOOPBACK] covers ~5 files
PASS

Checking coverage for a new file: net/ethtool/loopback.c
  Section NETWORKING [ETHTOOL LOOPBACK] covers ~5 files
PASS