IP-over-InfiniBand Connected Mode support

configname: CONFIG_INFINIBAND_IPOIB_CM

Linux Kernel Configuration
└─>Device Drivers
└─>InfiniBand support
└─>IP-over-InfiniBand Connected Mode support
In linux kernel since version 2.6.21.1 (release Date: 2007-04-27)  
This option enables support for IPoIB connected mode. After
enabling this option, you need to switch to connected mode
through /sys/class/net/ibXXX/mode to actually create
connections, and then increase the interface MTU with
e.g. ifconfig ib0 mtu 65520.

WARNING: Enabling connected mode will trigger some packet
drops for multicast and UD mode traffic from this interface,
unless you limit mtu for these destinations to 2044.