Generally RDMA implies kernel bypass as the point is to write into a process' address space efficiently, but you could conceivably implement RDMA in a way that

Generally RDMA implies kernel bypass as the point is to write into a process' address space efficiently, but you could conceivably implement RDMA in a way that goes through the kernel, e.g. by using a conventional NIC and doing a copy into the corresponding address space manually. Note that there are many other things using kernel bypass that are not RDMA.