apt install rdma-core
modprobe rdma
When using for nfs ... enable by outcomment rdma & rdma-port in /etc/nfs.conf, restart nfs server, mount with -o rdma
List the package / check the files yourself, haven't such host yet ...
You could load a module even if you don't use it.
But ethernet mode may be a reason when rdma isn't working even if rdma is loaded.
If you have connectx3 cards, you probably wont get this to work in EN mode due to early broken implementation of ROCE. as for IB- if you get this working (which will require both ends to be IB to work) the performance difference has been negligible when I tried it (which, admittedly, was quite a few years ago.) I'd take ethernet over IB every day and twice on Sunday.
