CONFIG_PHYLINK (not configurable)

modulename: phylink.ko

configname: CONFIG_PHYLINK

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>PHYLINK
In linux kernel since version 3.10 (release Date: 2013-06-30)  
PHYlink models the link between the PHY and MAC, allowing fixed
configuration links, PHYs, and Serdes links with MAC level
autonegotiation modes.

source code:
drivers/net/phy/phylink.c


is selected by
CONFIG_SFP