---
id: pr-vllm-39717
repo: vllm-project/vllm
pr: 39717
title: '[Bugfix] Reject non-nvfp4 dtypes when using the flashinfer_nvlink_one_sided all2all backend'
author: tlrmchlsmth
date: '2026-04-13'
url: https://github.com/vllm-project/vllm/pull/39717
source_category: upstream-code
architectures:
- sm100
tags:
- fp4
- kernel-fusion
- moe
- nvfp4
techniques:
- kernel-fusion
hardware_features:
- fp4
- nvfp4
kernel_types:
- moe
languages:
- python
captured_at: '2026-04-17'
status: merged
merge_sha: f72b20976c49f5cc522281b59df4863cabed8df2
inclusion_reason: kernel file changes
changed_paths:
- vllm/model_executor/layers/fused_moe/all2all_utils.py
head_ref_oid: 7380df8bb9f3f77f56176a11f7da3a6e8e45ad9c
artifact_dir: evidence/pull-bundles/vllm/gh-39717
---
# [Bugfix] Reject non-nvfp4 dtypes when using the flashinfer_nvlink_one_sided all2all backend

- Repository: `vllm-project/vllm`
- PR: [39717](https://github.com/vllm-project/vllm/pull/39717)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `vllm/model_executor/layers/fused_moe/all2all_utils.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-39717`
