[main][bugfix] bugfix for qwen3 moe quantization (#4599)

### What this PR does / why we need it?
Fix the issue where the qwen3 moe service cannot be started due to
upgrading the vllm version

Error info:
AttributeError: 'AscendFusedMoE' object has no attribute 'use dp
chunking'

### Does this PR introduce _any_ user-facing change?
no


- vLLM version: v0.11.2

---------

Signed-off-by: Wang Kunpeng <1289706727@qq.com>

vllm_ascend/quantization/quant_config.py

@@ -408,11 +408,10 @@ class AscendFusedMoEMethod(FusedMoEMethodBase):
         quant_config: The Ascend quantization config.
     """
 
-    def __init__(self,
-                 quant_config: AscendQuantConfig,
-                 prefix: str,
-                 packed_modules_mapping: Dict[str, Any],
-                 layer: torch.nn.Module = None):
+    def __init__(self, quant_config: AscendQuantConfig, prefix: str,
+                 packed_modules_mapping: Dict[str,
+                                              Any], layer: torch.nn.Module):
+        super().__init__(layer.moe_config)
         self.quant_method = get_quant_method(quant_config.quant_description,
                                              prefix,
                                              "moe",

vllm_ascend/torchair/ops/torchair_fused_moe.py

@@ -16,7 +16,7 @@
 # Adapted from vllm/tests/kernels/test_moe.py
 
 import os
-from typing import Any, Callable, Optional, Tuple, Union
+from typing import Any, Callable, Dict, Optional, Tuple, Union
 
 import torch
 import torch.distributed as dist
@@ -45,7 +45,9 @@ from vllm_ascend.ascend_forward_context import FusedMoEState
 from vllm_ascend.distributed.parallel_state import get_mc2_group
 from vllm_ascend.eplb.core.eplb_utils import determine_default_log2phy_map
 from vllm_ascend.ops.expert_load_balancer import ExpertLoadBalancer
-from vllm_ascend.quantization.quant_config import AscendFusedMoEMethod
+from vllm_ascend.quantization.quant_config import (AscendFusedMoEMethod,
+                                                   AscendQuantConfig)
+from vllm_ascend.quantization.utils import get_quant_method
 from vllm_ascend.torchair.ops.sequence_parallel import MetadataForPadding
 from vllm_ascend.torchair.utils import (get_all_reduce_merge_state,
                                         get_rm_router_logits_state,
@@ -936,6 +938,15 @@ class TorchairAscendUnquantizedFusedMoEMethod(UnquantizedFusedMoEMethod):
                 ep_group=get_ep_group())
 
 
+class TorchairAscendFusedMoEMethod(AscendFusedMoEMethod):
+
+    def __init__(self, quant_config: AscendQuantConfig, prefix: str,
+                 packed_modules_mapping: Dict[str, Any]):
+        self.quant_method = get_quant_method(quant_config.quant_description,
+                                             prefix, "moe",
+                                             packed_modules_mapping)
+
+
 class TorchairAscendFusedMoE(FusedMoE):
 
     # The moe_counter parameter is required during the initialization of EPLB
@@ -1115,7 +1126,7 @@ class TorchairAscendFusedMoE(FusedMoE):
                 self.quant_method = TorchairAscendUnquantizedFusedMoEMethod(
                     self.moe)
             else:
-                self.quant_method = AscendFusedMoEMethod(
+                self.quant_method = TorchairAscendFusedMoEMethod(
                     quant_config, prefix, quant_config.packed_modules_mapping)
 
         assert self.quant_method is not None