[Bugfix] fix dp parallel + tp > 1 offline inference port conflict (#4539)

### What this PR does / why we need it?
fix dp parallel + tp > 1 offline inference port conflict

issue import PR:https://github.com/vllm-project/vllm-ascend/pull/429


- vLLM version: v0.11.2
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.2

---------

Signed-off-by: leo-pony <nengjunma@outlook.com>

.github/workflows/_e2e_test.yaml

@@ -269,6 +269,7 @@ jobs:
             tests/e2e/multicard/test_offline_inference_distributed.py::test_models_distributed_DeepSeek_W4A8DYNAMIC 
             # tests/e2e/multicard/test_qwen3_moe.py::test_models_distributed_Qwen3_MOE_TP2_WITH_EP \
             # tests/e2e/multicard/test_qwen3_moe.py::test_models_distributed_Qwen3_MOE_W8A8_WITH_EP
+          pytest -sv tests/e2e/multicard/test_data_parallel_tp2.py
 
       - name: Install Ascend toolkit & triton_ascend (for Qwen3-Next-80B-A3B-Instruct)
         shell: bash -l {0}

tests/e2e/multicard/test_data_parallel_tp2.py

@@ -0,0 +1,52 @@
+"""
+Run `pytest tests/e2e/multicard/test_data_parallel_tp2.py`.
+"""
+
+import os
+import subprocess
+import sys
+from unittest.mock import patch
+
+import pytest
+
+MODELS = ["Qwen/Qwen3-0.6B"]
+
+
+@pytest.mark.parametrize("model", MODELS)
+@pytest.mark.parametrize("max_tokens", [32])
+@patch.dict(os.environ, {"ASCEND_RT_VISIBLE_DEVICES": "0,1,2,3"})
+def test_data_parallel_inference(model, max_tokens):
+    script = "examples/offline_data_parallel.py"
+
+    env = os.environ.copy()
+
+    cmd = [
+        sys.executable,
+        script,
+        "--model",
+        model,
+        "--dp-size",
+        "2",
+        "--tp-size",
+        "2",
+        "--node-size",
+        "1",
+        "--node-rank",
+        "0",
+        "--trust-remote-code",
+    ]
+
+    print(f"Running subprocess: {' '.join(cmd)}")
+    proc = subprocess.run(cmd,
+                          env=env,
+                          stdout=subprocess.PIPE,
+                          stderr=subprocess.STDOUT,
+                          timeout=600)
+    output = proc.stdout.decode()
+
+    print(output)
+
+    assert "DP rank 0 needs to process" in output
+    assert "DP rank 1 needs to process" in output
+    assert "Generated text:" in output
+    assert proc.returncode == 0

vllm_ascend/patch/platform/patch_distributed.py

@@ -18,32 +18,10 @@
 # This file is a part of the vllm-ascend project.
 
 import torch
-import vllm.envs as envs_vllm
-from vllm.config import ParallelConfig
 
 from vllm_ascend.utils import AscendDeviceType, get_ascend_device_type
 
 
-def parallel_config_get_dp_port(self) -> int:
-    """
-    We might need to initialize process groups in multiple
-    processes that is related to data parallelism,
-    e.g. both in the worker and in the engine, which
-    can live in different processes. To avoid port conflicts, we
-    increment the port number each time we need to initialize a
-    new process group related to data parallelism.
-    """
-    answer = self.data_parallel_master_port
-    self.data_parallel_master_port += 1
-
-    # NOTE: Get port from envs directly when using torchrun
-    port = envs_vllm.VLLM_DP_MASTER_PORT if envs_vllm.VLLM_DP_MASTER_PORT else answer
-    return port
-
-
-ParallelConfig.get_next_dp_init_port = parallel_config_get_dp_port
-
-
 class NullHandle:
 
     def __init__(self):