CONFIG_INFINIBAND_RDMAVT is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT

RDMA verbs transport library

modulename: rdmavt.ko

configname: CONFIG_INFINIBAND_RDMAVT

Linux Kernel Configuration
└─>Device Drivers
└─>InfiniBand support
└─>RDMA verbs transport library
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This is a common software verbs provider for RDMA networks.

source code: