[TRTLLM-15033][fix] Revert #17800 FlashInfer CuTeDSL MLA dispatch - #18653
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Remove the FlashInfer-to-CuTeDSL MLA backend path introduced by NVIDIA#17800 while preserving the standalone CuTeDSL FMHA backend and later DSA, Helix, combined-FMHA, and sysinfo changes. Signed-off-by: Pengbo Wang <221450789+pengbowang-nv@users.noreply.github.com>
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Inline comments:
In `@tests/unittest/_torch/attention/test_fmha_page_index.py`:
- Line 350: Add a direct MLA dispatch test that intercepts
flashinfer.mla.trtllm_batch_decode_with_kv_cache_mla and verifies
backend="trtllm-gen", params.sequence_lengths, USE_SHARED_PAGED_KV_IDX, and
multi_ctas_kv_counter_buffer; also register the changed tests in the appropriate
integration test lists.
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📒 Files selected for processing (16)
docs/source/deployment-guide/deployment-guide-for-kimi-k3-on-trtllm.mdexamples/kimi_k3/README.mdtensorrt_llm/_torch/attention/ATTENTION_DEVELOPER_GUIDE.mdtensorrt_llm/_torch/attention/backends/fmha/cute_dsl_mla.pytensorrt_llm/_torch/attention/backends/fmha/flashinfer_trtllm_gen.pytensorrt_llm/_torch/attention/backends/fmha/interface.pytensorrt_llm/_torch/attention/backends/trtllm.pytensorrt_llm/_torch/attention/backends/utils.pytensorrt_llm/_torch/attention/mla.pytensorrt_llm/_torch/modules/kimi_k3_mla/kimi_k3_mla_attention.pytests/integration/test_lists/test-db/l0_b200.ymltests/scripts/perf/disaggregated/gb300_kimi-k3-fp4_8k1k_con512_ctx1_dep16_gen1_dep16_eplb0_mtp0_ccb-NIXL.yamltests/unittest/_torch/attention/fmha_test_utils.pytests/unittest/_torch/attention/sparse/dsa/test_req_idx_per_token.pytests/unittest/_torch/attention/test_fmha_page_index.pytests/unittest/_torch/modules/test_kimi_k3_mla_backend.py
💤 Files with no reviewable changes (10)
- tensorrt_llm/_torch/attention/ATTENTION_DEVELOPER_GUIDE.md
- tests/integration/test_lists/test-db/l0_b200.yml
- tests/unittest/_torch/attention/sparse/dsa/test_req_idx_per_token.py
- tests/unittest/_torch/attention/fmha_test_utils.py
- tensorrt_llm/_torch/attention/backends/utils.py
- tensorrt_llm/_torch/attention/backends/fmha/cute_dsl_mla.py
- tensorrt_llm/_torch/attention/mla.py
- tests/unittest/_torch/modules/test_kimi_k3_mla_backend.py
- examples/kimi_k3/README.md
- tensorrt_llm/_torch/attention/backends/trtllm.py
🚧 Files skipped from review as they are similar to previous changes (3)
- tests/scripts/perf/disaggregated/gb300_kimi-k3-fp4_8k1k_con512_ctx1_dep16_gen1_dep16_eplb0_mtp0_ccb-NIXL.yaml
- docs/source/deployment-guide/deployment-guide-for-kimi-k3-on-trtllm.md
- tensorrt_llm/_torch/modules/kimi_k3_mla/kimi_k3_mla_attention.py
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Remove the FlashInfer-to-CuTeDSL MLA backend path introduced by #17800 while preserving the standalone CuTeDSL FMHA backend and later DSA, Helix, combined-FMHA, and sysinfo changes.
Reason: we have a cutedsl fmha backend path that's more thoroughly tested and reviewed.
Perf consideration: won't have perf impact as in current case, MTP is not enabled for this flashinfer cutedsl backend and the perf difference would be minimal.
Description
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PR Checklist
Please review the following before submitting your PR:
PR description clearly explains what and why. If using CodeRabbit's summary, please make sure it makes sense.
PR Follows TRT-LLM CODING GUIDELINES to the best of your knowledge.
Test cases are provided for new code paths (see test instructions)
If PR introduces API changes, an appropriate PR label is added - either
api-compatibleorapi-breaking. Forapi-breaking, includeBREAKINGin the PR title.Any new dependencies have been scanned for license and vulnerabilities
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Documentation updated as needed
Update tava architecture diagram if there is a significant design change in PR.
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/bot help.Dev Engineer Review
flashinfer_mla_backendAPI and related policy, staging, validation, and execution paths.Verdict: sufficient.
QA Engineer Review
Modified test files and coverage:
tests/integration/test_lists/test-db/l0_b200.yml: removes the Kimi K3 MLA backend configuration test.tests/scripts/perf/disaggregated/gb300_kimi-k3-fp4_8k1k_con512_ctx1_dep16_gen1_dep16_eplb0_mtp0_ccb-NIXL.yaml: removes the obsolete backend environment setting.tests/unittest/_torch/attention/sparse/dsa/test_req_idx_per_token.py: updates the invalidation test for removed staging state.tests/unittest/_torch/attention/test_fmha_page_index.py: removes obsolete MLA backend-policy tests and updates MLA generation-support tests.tests/unittest/_torch/modules/test_kimi_k3_mla_backend.py: removes tests for the deleted backend-selection and validation behavior.tests/unittest/_torch/attention/fmha_test_utils.py: removes the obsoleteFakeAttention.flashinfer_mla_backendattribute.The modified test-list entry uses the existing test-list format and removes coverage for deleted functionality. The remaining test changes align with the removed API and backend policy. The reviewed test changes are covered by the updated B200 test-list entry where applicable.
Verdict: sufficient.