[TRTLLM-15344][feat] nixl bounce v2 (2/6): wire protocol and transfer plan - #17604
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This was referenced Aug 13, 2026
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Buddy allocator, shared data arena, execution-context pool, and the gather/scatter CUDA kernel, plus their unit tests. These are the dependency-free building blocks of the NIXL bounce-buffer v2 transport; nothing is wired into production paths yet. Signed-off-by: Chuang Zhu <111838961+chuangz0@users.noreply.github.com>
Bounce config (env-var parsing), wire message codec (control-plane messages + capability handshake encode/decode), and the transfer-plan builder that maps a TransferRequest onto bounce chunks. Unit-tested; still not reachable from production paths. Signed-off-by: Chuang Zhu <111838961+chuangz0@users.noreply.github.com>
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@coderabbitai summary
Description
Part 2/6 of splitting the NIXL bounce-buffer v2 transport (#15780) into reviewable pieces. This PR adds the protocol layer:
BounceConfig— env-var driven configuration (byte-size suffix parsing, limits, opt-in knobs)BounceMessage— control-plane wire codec (chunk grant/complete messages + the capability handshakeencodeHandshake/decodeHandshakeused during agent connection)BounceTransferPlan— maps aTransferRequestonto bounce chunks (region splitting, size limits)Pure logic, unit-tested, still not reachable from production paths.
Stack: part 2/6, stacked on #17603 — review only the last commit (
nixl bounce v2 (2/6)); the earlier commits belong to part 1. Umbrella: #15780.Test Coverage
cpp/tests/unit_tests/executor/bounce/bounceConfigTest.cppcpp/tests/unit_tests/executor/bounce/bounceMessageCodecTest.cppcpp/tests/unit_tests/executor/bounce/bounceTransferPlanTest.cppPR Checklist
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