Hmmm... in my case there was no rdma_cm device until I re-installed MLNX OFED with kernel support. I had the same entry in start up log:
#cat /var/log/messages | grep rdma
Jan 11 13:01:38 fedor6 openibd: Module rdma_cm belong to kernel which is not a part of MLNX_OFED, skipping...[FAILED]
Jan 11 13:01:38 fedor6 logger[2936]: openibd: ERROR: Module rdma_cm belong to kernel which is not a part of MLNX_OFED, skipping...