2 Alexander: Thanks for the tip
For bookkeeping here is a solution that worked for me.
I have Minimal CentOS install on my servvers. Adding kernel support required adding some components:.
Step 1: Upgrading kernel to the latest version
#yum -y update kernel
<reboot>
Step 2: Installing kernel sources:
#yum install -y kernel-devel
Step 3: Install some tools needed by Mellanox script:
#yum install -y python-devel redhat-rpm-config rpm-build
Step 4: Re-install mellanox OFED with "--add-kernel-support" option:
#mlnxofedinstall --add-kernel-support
<reboot>
Step 5: Verify that device "rdma_cm" is available:
# ls /dev/infiniband/
issm0 issm1 rdma_cm ucm0 umad0 umad1 uverbs0