balar: shared packet wire ABI + coherence-aware DoorbellTestCPU and contract tests by nab880 · Pull Request #2690 · sstsimulator/sst-elements

nab880 · 2026-06-24T07:00:06Z

The existing balar_packet.h pulls in the CUDA toolkit headers (builtin_types.h, driver_types.h) and wraps everything in SST C++ namespaces. That makes the byte layout impossible to share with any peer that isn't a full SST/CUDA C++ translation unit — there was no safe, dependency-light way for another driver to agree on exactly what bytes balar expects.

This PR factors the on-the-wire definitions out of balar_packet.h into a new standalone header, balar_packet_wire.

Contributions:

Share Balar's packet layout with non-SST/CUDA drivers (balar_packet_wire.h)
Test coverage for a coverage for the cached-write → flush → doorbell path. (BalarTestCPU)
Fix per-copy buffer leak on the device-to-host memcpy path

sst-autotester · 2026-06-24T17:10:39Z

Status Flag 'Pre-Test Inspection' - Auto Inspected - Inspection is Not Necessary for this Pull Request.

sst-autotester · 2026-06-24T17:31:02Z

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Pull Request Author: nab880

sst-autotester · 2026-06-25T02:25:32Z

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sst-autotester · 2026-06-25T05:19:49Z

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Pull Request Author: nab880

sst-autotester · 2026-06-25T05:57:55Z

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sst-autotester · 2026-06-25T05:58:12Z

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Pull Request Author: nab880

sst-autotester · 2026-07-23T19:08:14Z

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nab880 requested a review from hughes-c June 24, 2026 07:00

nab880 force-pushed the pr1-balar branch from 5358932 to 511a463 Compare June 24, 2026 10:56

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