TCM Virtual SAS target and Linux/SCSI LDD fabric loopback module

modulename: tcm_loop.ko

configname: CONFIG_LOOPBACK_TARGET

Linux Kernel Configuration
└─>Device Drivers
└─>Generic Target Core Mod (TCM) and ConfigFS Infrastructure
└─>TCM Virtual SAS target and Linux/SCSI LDD fabric loopback module
In linux kernel since version 2.6.39 (release Date: 2011-05-18)  
Say Y here to enable the TCM Virtual SAS target and Linux/SCSI LLD
fabric loopback module.

source code:
drivers/target/loopback/tcm_loop.c