`nfs-server` can't request RDMA servives

Need a nfs-server on my raspberry pi.
The result I get from sudo systemctl status nfs-server after starting the nsf-server:

nfs-server.service - NFS server and services
     Loaded: loaded (/usr/lib/systemd/system/nfs-server.service; enabled; vendor preset: disabled)
    Drop-In: /run/systemd/generator/nfs-server.service.d
     Active: active (exited) since Mon 2021-08-02 22:24:27 +0430; 1h 3min ago
    Process: 3545 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS)
    Process: 3546 ExecStart=/usr/sbin/rpc.nfsd (code=exited, status=0/SUCCESS)
   Main PID: 3546 (code=exited, status=0/SUCCESS)
        CPU: 25ms

Aug 02 22:24:27 raspberry systemd[1]: Starting NFS server and services...
Aug 02 22:24:27 raspberry rpc.nfsd[3546]: rpc.nfsd: Unable to request RDMA services: Protocol not supported
Aug 02 22:24:27 raspberry systemd[1]: Finished NFS server and services.

That message is informational, not an error. NFS over TCP works as expected.

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