What you're looking for is RDMA. It was mostly restricted to Infiniband (IB) back in the days, but nowadays you probably want RoCEv2. You can look at iWARP too

What you're looking for is RDMA. It was mostly restricted to Infiniband (IB) back in the days, but nowadays you probably want RoCEv2. You can look at iWARP too but I think nowadays RoCE won. In any case, the standard software API for RDMA is ibverbs. All adapters supporting RDMA (be it IB, RoCE or iWARP) will expose it. You can get cloud instances with RDMA on AWS and Azure.