Google's networking stack – Snap: a microkernel approach to host networking

Impressive, Alibaba used something like that with RDMA to hook up remote storage/tls termination/transcoding.

The entirety of control plane is done in http apis that basically ssh into switches and opens L2 route from the client to RDMA box.

Then the userspace lib calls the control server to get address and settings for that RDMA box.

Every other interaction is than handled by userspace libraries that don't expose RDMA.