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

Broadcom Netxtreme HCA support

modulename: bnxt_re.ko

configname: CONFIG_INFINIBAND_BNXT_RE

Linux Kernel Configuration
└─>Device Drivers
└─>InfiniBand support
└─>Ethernet driver support
└─>Network device support
└─>PCI support
└─>Broadcom Netxtreme HCA support
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This driver supports Broadcom NetXtreme-E 10/25/40/50 gigabit
RoCE HCAs. To compile this driver as a module, choose M here:
the module will be called bnxt_re.

source code: