SFP cage support

modulename: sfp.ko

and/or

sfp-bus.ko

configname: CONFIG_SFP

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>PHY Device support and infrastructure
└─>SFP cage support
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
drivers/net/phy/sfp.c
selects
CONFIG_MDIO_I2C