SLIRP refactor — lift passt patterns into our smoltcp stack (Phases 0–5 + 5.5b)#68

Merged

dpsoft merged 92 commits intomainfrom

smoltcp-passt-port-phase0

May 6, 2026

Commits on Apr 28, 2026

Commits on Apr 29, 2026

bench(network): populate ICMP RR latency p50
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fix(scripts): revert setuid busybox in test image (Phase 1.6 regression)
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docs(plans): add Phase 2 plan (generalize UDP via per-flow connected sockets)
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feat(slirp): add UdpFlowEntry + per-flow connected socket helper
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feat(slirp): forward non-DNS UDP via per-flow connected sockets
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ci(bench): add strict voidbox-network-bench step (no continue-on-error)
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feat(slirp): relay UDP flow replies back to guest
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feat(slirp): UDP flow idle reap (60s)
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test(network): full RTT for UDP pin (was BROKEN_ON_PURPOSE one-way)
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bench(network): document DNS qps busybox-nc bottleneck (set null + WARN)
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fix(startup-bench): require userspace vsock backend for snapshot capture
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docs(plans): add Phase 3 plan (TCP relay rewrite via MSG_PEEK + sequence mirroring)
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docs(plans): lock observability as a hard non-negotiable invariant
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refactor(slirp): add bytes_in_flight to TcpNatEntry (no behavior change)
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refactor(slirp): add recv_peek helper using libc::recv MSG_PEEK
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refactor(slirp): peek-based host→guest TCP relay (drops to_guest dependency)
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refactor(slirp): ACK-driven consume from kernel socket
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refactor(slirp): drop to_host buffer + 256KB cliff, use TCP backpressure
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refactor(slirp): drop to_guest/to_host/pending_ack fields and dead helpers
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test(network): flip 256KB cliff pin — assert >1MB throughput succeeds
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bench(network): tcp_bulk_throughput_1mb — measures post-Phase-3 backpressure path
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bench(network): --bulk-mb mode to measure post-Phase-3 backpressure
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docs(plans): add Phase 4 plan (unified flow table refactor)
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refactor(slirp): define FlowKey + FlowEntry enums (no callers yet)
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Commits on Apr 30, 2026