---
id: pr-vllm-34883
repo: vllm-project/vllm
pr: 34883
title: '[Core] Add All-to-All communication backend for DCP '
author: sungsooha
date: '2026-03-04'
url: https://github.com/vllm-project/vllm/pull/34883
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 6cb901093f3df8e26cbc0a8a0e1a884f4dbaa5ea
inclusion_reason: defer
changed_paths:
- tests/distributed/test_dcp_a2a.py
- vllm/config/parallel.py
- vllm/config/vllm.py
- vllm/engine/arg_utils.py
- vllm/model_executor/layers/attention/mla_attention.py
- vllm/v1/attention/backends/flash_attn.py
- vllm/v1/attention/backends/flashinfer.py
- vllm/v1/attention/ops/dcp_alltoall.py
artifact_dir: evidence/pull-bundles/vllm/gh-34883
head_ref_oid: 11109ba353bdf6304f3de362e67a4fc243e09431
---
# [Core] Add All-to-All communication backend for DCP 

- Repository: `vllm-project/vllm`
- PR: [34883](https://github.com/vllm-project/vllm/pull/34883)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `tests/distributed/test_dcp_a2a.py`
- `vllm/config/parallel.py`
- `vllm/config/vllm.py`
- `vllm/engine/arg_utils.py`
- `vllm/model_executor/layers/attention/mla_attention.py`
- `vllm/v1/attention/backends/flash_attn.py`
- `vllm/v1/attention/backends/flashinfer.py`
- `vllm/v1/attention/ops/dcp_alltoall.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-34883`
