[TRTLLM-11016][fix] Add cacheSaltID property to BlockKey serialization code

[thorjohnsen]

Summary by CodeRabbit

• Chores
  • Enhanced KV cache management infrastructure to support improved caching capabilities and operations.

Description

Noticed one property (cacheSaltID) is missing in BlockKey c++ serialization code. Decided to add it.

Work for this issue is tracked in https://jirasw.nvidia.com/browse/TRTLLM-11016.

Test Coverage

BlockKey serialization test should verify that cacheSaltID property is deserialized with non-default value.

PR Checklist

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[thorjohnsen]

/bot run --disable-fail-fast

[coderabbitai]

📝 Walkthrough

Walkthrough

Added support for an optional cacheSaltID field to the BlockKey structure. Updated serialization, deserialization, and serializedSize methods to handle the new field in KV cache management.

Changes

Cohort / File(s)	Summary
Serialization Support for BlockKey cacheSaltID cpp/tensorrt_llm/executor/serialization.cpp	Added serialization and deserialization support for the optional cacheSaltID field in BlockKey, including updates to serialized size calculation, serialize method, and deserializeBlockKey method.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding cacheSaltID property to BlockKey serialization code with appropriate ticket reference and fix type.
Description check	✅ Passed	The PR description includes all required template sections: description explaining the issue and solution, test coverage details, and a completed PR checklist.

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[tensorrt-cicd]

PR_Github #35661 [ run ] triggered by Bot. Commit: 8ecbf68

[tensorrt-cicd]

PR_Github #35661 [ run ] completed with state SUCCESS. Commit: 8ecbf68
/LLM/main/L0_MergeRequest_PR pipeline #27539 completed with status: 'FAILURE'

⚠️ Action Required:

• Please check the failed tests and fix your PR
• If you cannot view the failures, ask the CI triggerer to share details
• Once fixed, request an NVIDIA team member to trigger CI again

[thorjohnsen]

/bot run

[tensorrt-cicd]

PR_Github #35683 [ run ] triggered by Bot. Commit: 8ecbf68

[tensorrt-cicd]

PR_Github #35683 [ run ] completed with state SUCCESS. Commit: 8ecbf68
/LLM/main/L0_MergeRequest_PR pipeline #27561 completed with status: 'FAILURE'

⚠️ Action Required:

• Please check the failed tests and fix your PR
• If you cannot view the failures, ask the CI triggerer to share details
• Once fixed, request an NVIDIA team member to trigger CI again

[thorjohnsen]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #35914 [ run ] triggered by Bot. Commit: 7f5562d

[tensorrt-cicd]

PR_Github #35914 [ run ] completed with state SUCCESS. Commit: 7f5562d
/LLM/main/L0_MergeRequest_PR pipeline #27737 completed with status: 'FAILURE'

⚠️ Action Required:

• Please check the failed tests and fix your PR
• If you cannot view the failures, ask the CI triggerer to share details
• Once fixed, request an NVIDIA team member to trigger CI again

[thorjohnsen]

/bot run

[tensorrt-cicd]

PR_Github #35950 [ run ] triggered by Bot. Commit: 7f5562d

[tensorrt-cicd]

PR_Github #35950 [ run ] completed with state SUCCESS. Commit: 7f5562d
/LLM/main/L0_MergeRequest_PR pipeline #27765 completed with status: 'SUCCESS'