[Misc] Nit fix for disaggregated_prefill and ascend_forward_context (#2097)

we recently added disaggregated_prefill and ascend_forward_context
feature by
ba3dfbd59e
and
df0ec55162.
This PR fix some nit introduced by them to make the code clear.
1. drop `current_platform` usage. It'll lead unknown circular import
error in some case
2. update `set_ascend_forward_context` function to make the logic clear.
for example, remove V0 support in this function.
3. Remove useless `self.local_rank_across_dp` in worker
4. Remove `soc_info.py` to use `get_ascend_soc_version` instead.
 

- vLLM version: v0.10.0
- vLLM main:
02f82fe438

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm_ascend/ascend_forward_context.py

@@ -7,9 +7,9 @@ import torch
 from vllm.config import VllmConfig
 from vllm.distributed import get_dp_group, get_ep_group, get_tp_group
 from vllm.forward_context import get_forward_context, set_forward_context
-from vllm.platforms import current_platform
 
 import vllm_ascend.envs as envs
+from vllm_ascend.platform import NPUPlatform
 
 
 class FusedMoEState(Enum):
@@ -22,8 +22,8 @@ class FusedMoEState(Enum):
 
 
 # TODO(zzzzwwjj): add soc_version to choose branch
-def get_fused_moe_state(ep_size: int, with_prefill: bool,
-                        is_deepseek_v3_r1: bool):
+def _get_fused_moe_state(ep_size: int, with_prefill: bool,
+                         is_deepseek_v3_r1: bool):
     # the fusion operator torch_npu.npu_grouped_matmul_finalize_routing called by allgather ep
     # only supports deepseek v3/r1
     if (envs.VLLM_ENABLE_FUSED_EXPERTS_ALLGATHER_EP and ep_size > 1
@@ -73,11 +73,9 @@ def set_ascend_forward_context(
         is_deepseek_v3_r1 = hasattr(
             vllm_config.model_config.hf_config, 'n_routed_experts'
         ) and vllm_config.model_config.hf_config.n_routed_experts == 256
-        fused_moe_state = get_fused_moe_state(ep_size, with_prefill,
-                                              is_deepseek_v3_r1)
-
+        fused_moe_state = _get_fused_moe_state(ep_size, with_prefill,
+                                               is_deepseek_v3_r1)
         forward_context.fused_moe_state = fused_moe_state
-
         forward_context.in_profile_run = in_profile_run
 
         # NOTE: This cannot be set using set_forward_context
@@ -85,15 +83,7 @@ def set_ascend_forward_context(
         forward_context.capturing = False
 
         if num_tokens is None and attn_metadata is not None:
-            if hasattr(attn_metadata, 'num_actual_tokens'):
-                # for v1 engine
-                num_tokens = attn_metadata.num_actual_tokens
-            else:
-                # for v0 engine
-                num_tokens = attn_metadata.num_prefill_tokens + attn_metadata.num_decode_tokens
-
-        if num_actual_tokens is None:
-            num_actual_tokens = num_tokens
+            num_tokens = attn_metadata.num_actual_tokens
 
         dp_world_size = get_dp_group().world_size
         if dp_world_size > 1 and forward_context.dp_metadata is not None:
@@ -105,6 +95,8 @@ def set_ascend_forward_context(
         forward_context.max_tokens_across_dp = max_tokens_across_dp
 
         if num_tokens is not None:
+            if num_actual_tokens is None:
+                num_actual_tokens = num_tokens
             tp_world_size = get_tp_group().world_size
             # NOTE: token num which need to pad to when mc2
             forward_context.padded_num_tokens = math.ceil(
@@ -112,7 +104,7 @@ def set_ascend_forward_context(
 
             mc2_mask = torch.zeros(forward_context.padded_num_tokens,
                                    dtype=torch.bool,
-                                   device=current_platform.device_type)
+                                   device=NPUPlatform.device_type)
             mc2_mask[:num_actual_tokens] = True
             forward_context.mc2_mask = mc2_mask
 

vllm_ascend/distributed/llmdatadist_c_mgr_connector.py

@@ -28,7 +28,7 @@ from vllm.v1.core.sched.output import SchedulerOutput
 from vllm.v1.request import Request, RequestStatus
 
 from vllm_ascend import envs
-from vllm_ascend.soc_info import NPUSocInfo
+from vllm_ascend.utils import AscendSocVersion, get_ascend_soc_version
 
 TORCH_DTYPE_TO_NPU_DTYPE = {
     torch.half: llm_datadist.DataType.DT_FLOAT16,
@@ -336,7 +336,7 @@ class LLMDataDistCMgrConnectorWorker():
                                         self.local_agent_metadata.cluster_id)
         self.init_llm_datadist()
         self.finished_reqs: set[str] = set()
-        self.soc_info = NPUSocInfo()
+        self.soc_info = get_ascend_soc_version()
         # Set hccl deterministic for model execute
         os.environ["HCCL_DETERMINISTIC"] = "true"
         self.done_receiving_counts: defaultdict[str,
@@ -681,7 +681,7 @@ class LLMDataDistCMgrConnectorWorker():
             rank_table["server_list"].append(  # type: ignore[attr-defined]
                 decode_server_device_info)
 
-        if self.soc_info.is_a3:
+        if self.soc_info == AscendSocVersion.A3:
             # generate super_pod_list for rank table
             super_pod_list = []
             prefill_super_pod_info = {

vllm_ascend/soc_info.py

@@ -1,14 +0,0 @@
-from dataclasses import dataclass
-
-import torch_npu
-
-
-@dataclass
-class NPUSocInfo:
-    is_a3: bool = False
-
-    def __post_init__(self):
-        torch_npu.npu._lazy_init()
-        self.soc_version = torch_npu._C._npu_get_soc_version()
-        if self.soc_version in (250, 251, 252, 253, 254, 255):
-            self.is_a3 = True

vllm_ascend/utils.py

@@ -479,7 +479,8 @@ def register_ascend_customop():
     _ASCEND_CUSTOMOP_IS_REIGISTERED = True
 
 
-# TODO(zzzzwwjj): It will be judged with _build_info afterwards.
+# TODO(zzzzwwjj): Currently there is no clear SOC_VERSION policy for A2 and A3 in CANN.
+# So we get the version dynamically. In the future, we should get the version info from _build_info like 310p does.
 class AscendSocVersion(Enum):
     A2 = 0
     A3 = 1

vllm_ascend/worker/worker_v1.py

@@ -71,8 +71,10 @@ class NPUWorker(WorkerBase):
         from vllm_ascend import ops
         ops.register_dummy_fusion_op()
         _register_atb_extensions()
-        # init ascend config
+
+        # init ascend config and soc version
         init_ascend_config(vllm_config)
+        init_ascend_soc_version()
 
         super().__init__(vllm_config=vllm_config,
                          local_rank=local_rank,
@@ -81,9 +83,6 @@ class NPUWorker(WorkerBase):
                          is_driver_worker=is_driver_worker)
 
         # Try to import mindie_turbo to accelerate vLLM inference.
-        local_dp_rank = self.vllm_config.parallel_config.data_parallel_rank_local
-        world_size = self.vllm_config.parallel_config.world_size
-        self.local_rank_across_dp = local_dp_rank * world_size + self.local_rank
         try_register_lib(
             "mindie_turbo",
             "MindIE Turbo is installed. vLLM inference will be accelerated with MindIE Turbo."
@@ -137,7 +136,6 @@ class NPUWorker(WorkerBase):
         NPUPlatform.empty_cache()
         self.init_npu_memory = NPUPlatform.mem_get_info()[0]
 
-        init_ascend_soc_version()
         # Initialize the distributed environment.
         self._init_worker_distributed_environment()
         # Set random seed.