Support Apple RDMA in layer parallel mode - #715
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Distributed pipeline inference over a UC dual-QP-pair channel (ds4_dist_dchan): a full-duplex reliable byte stream that replaces the TCP data plane so pipelined prefill runs over RDMA. Opt in with --dist-transport rdma; --dist-rdma-adj-devices selects the local device per neighbour (a bare name for a routable fabric, or a peerhost=device map for point-to-point Thunderbolt links). librdma is loaded at runtime and the link bring-up (device/GID discovery, UC INIT->RTR->RTS) is shared with the tensor-parallel path in ds4_rdma_verbs; off Apple the RDMA files compile to TCP-only stubs. See Apple TN3205.
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Supporting RDMA layer parallel mode: