[BUG] Can't execute ibswitches or ibhosts, infiniband not working.

Hi, when i execute command ibhost, this is what i got but i won't get the error if i execute it on normal Debian:
root@localhost:~# ibhosts
ibwarn: [20302] mad_rpc_open_port: client_register for mgmt 1 failed
./libibnetdisc/ibnetdisc.c:802; can't open MAD port ((null):0)
/usr/sbin/ibnetdiscover: iberror: failed: discover failed

Please help!