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EFA adapters are exposed through libfabrics (https://github.com/aws/libfabric) which offers a comparable interface in terms of functionality (slightly higher level actually). So an application written for libverbs won't work on EFA/libfabric without a significant rewrite.
It does not offer RDMA capabilities yet, but this is usually an implementation detail. What the customer usually cares about is the low-latency / high-throughput and not the fact that the messages are actually transmitted using RDMA.