Intel(R) Ethernet X722 iWARP Driver

modulename: i40iw.ko

configname: CONFIG_INFINIBAND_I40IW

Linux Kernel Configuration
└─>Device Drivers
└─>InfiniBand support
└─>Intel(R) Ethernet X722 iWARP Driver
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Intel(R) Ethernet X722 iWARP Driver
INET && I40IW && INFINIBAND && I40E

source code:
drivers/infiniband/hw/i40iw/