Merge branch 'v0.15.1-dev' into 'v0.15.1-dev-w4a8+pp_balance'

# Conflicts:
#   vllm/envs.py

csrc/sampler.cu

@@ -215,7 +215,11 @@ __device__ bool processHistogramStep(
 
     // Compute the prefix sum.
     int prefixSum{0}, totalSum{0};
-    using Scan = cub::BlockScan<int, kNumThreadsPerBlock>;
+    #ifndef USE_ROCM
+      using Scan = cub::BlockScan<int, kNumThreadsPerBlock>;
+    #else:
+      using Scan = hipcub::BlockScan<int, kNumThreadsPerBlock>;
+    #endif
     Scan(smemFinal.histo.scan).ExclusiveSum(binCount, prefixSum, totalSum);
 
     // Update the histogram with the prefix sums.
@@ -334,13 +338,22 @@ static __device__ void topKPerRowJob(const int* indices, const float* logits,
   static constexpr int kNumFinalItemsPerThread =
       kNumFinalItems / kNumThreadsPerBlock;
   // The class to sort the elements during the final pass.
-  using FinalSort = cub::BlockRadixSort<float, kNumThreadsPerBlock,
-                                        kNumFinalItemsPerThread, int>;
+  #ifndef USE_ROCM
+    using FinalSort = cub::BlockRadixSort<float, kNumThreadsPerBlock,
+                                          kNumFinalItemsPerThread, int>;
+  #else
+    using FinalSort = hipcub::BlockRadixSort<float, kNumThreadsPerBlock,
+                                          kNumFinalItemsPerThread, int>;
+  #endif
+
   using FinalSortTempStorage =
       std::conditional_t<useRadixSort, typename FinalSort::TempStorage, int>;
   // The class to compute the inclusive prefix-sum over the histogram.
-  using Scan = cub::BlockScan<int, kNumThreadsPerBlock>;
-
+  #ifndef USE_ROCM
+    using Scan = cub::BlockScan<int, kNumThreadsPerBlock>;
+  #else
+    using Scan = hipcub::BlockScan<int, kNumThreadsPerBlock>;
+  #endif
   // The structure to store the final items (for the final pass).
   struct FinalItems {
     // Shared memory to store the indices for the final pass.

docs/models/supported_models.md

@@ -507,7 +507,7 @@ These models primarily support the [`LLM.embed`](./pooling_models.md#llmembed) A
 | `RobertaModel`, `RobertaForMaskedLM` | RoBERTa-based | `sentence-transformers/all-roberta-large-v1`, etc. | | |
 | `*Model`<sup>C</sup>, `*ForCausalLM`<sup>C</sup>, etc. | Generative models | N/A | \* | \* |
 
-<sup>C</sup> Automatically converted into an embedding model via `--convert embed`. ([details](./pooling_models.md#model-conversion))  
+<sup>C</sup> Automatically converted into an embedding model via `--convert embed`. ([details](./pooling_models.md#model-conversion))
 \* Feature support is the same as that of the original model.
 
 !!! note
@@ -538,7 +538,7 @@ These models primarily support the [`LLM.classify`](./pooling_models.md#llmclass
 | `GPT2ForSequenceClassification` | GPT2 | `nie3e/sentiment-polish-gpt2-small` | | |
 | `*Model`<sup>C</sup>, `*ForCausalLM`<sup>C</sup>, etc. | Generative models | N/A | \* | \* |
 
-<sup>C</sup> Automatically converted into a classification model via `--convert classify`. ([details](./pooling_models.md#model-conversion))  
+<sup>C</sup> Automatically converted into a classification model via `--convert classify`. ([details](./pooling_models.md#model-conversion))
 \* Feature support is the same as that of the original model.
 
 If your model is not in the above list, we will try to automatically convert the model using
@@ -561,7 +561,7 @@ These models primarily support the [`LLM.score`](./pooling_models.md#llmscore) A
 | `XLMRobertaForSequenceClassification` | XLM-RoBERTa-based | `BAAI/bge-reranker-v2-m3`, etc. | N/A | | |
 | `*Model`<sup>C</sup>, `*ForCausalLM`<sup>C</sup>, etc. | Generative models | N/A | N/A | \* | \* |
 
-<sup>C</sup> Automatically converted into a classification model via `--convert classify`. ([details](./pooling_models.md#model-conversion))  
+<sup>C</sup> Automatically converted into a classification model via `--convert classify`. ([details](./pooling_models.md#model-conversion))
 \* Feature support is the same as that of the original model.
 
 !!! note
@@ -717,6 +717,8 @@ These models primarily accept the [`LLM.generate`](./generative_models.md#llmgen
 | `Qwen2VLForConditionalGeneration` | QVQ, Qwen2-VL | T + I<sup>E+</sup> + V<sup>E+</sup> | `Qwen/QVQ-72B-Preview`, `Qwen/Qwen2-VL-7B-Instruct`, `Qwen/Qwen2-VL-72B-Instruct`, etc. | ✅︎ | ✅︎ |
 | `Qwen2_5_VLForConditionalGeneration` | Qwen2.5-VL | T + I<sup>E+</sup> + V<sup>E+</sup> | `Qwen/Qwen2.5-VL-3B-Instruct`, `Qwen/Qwen2.5-VL-72B-Instruct`, etc. | ✅︎ | ✅︎ |
 | `Qwen2_5OmniThinkerForConditionalGeneration` | Qwen2.5-Omni | T + I<sup>E+</sup> + V<sup>E+</sup> + A<sup>+</sup> | `Qwen/Qwen2.5-Omni-3B`, `Qwen/Qwen2.5-Omni-7B` | ✅︎ | ✅︎ |
+| `Qwen3_5ForConditionalGeneration` | Qwen3.5 | T + I<sup>E+</sup> + V<sup>E+</sup> | `Qwen/Qwen3.5-9B-Instruct`, etc. | ✅︎ | ✅︎ |
+| `Qwen3_5MoeForConditionalGeneration` | Qwen3.5-MOE | T + I<sup>E+</sup> + V<sup>E+</sup> | `Qwen/Qwen3.5-35B-A3B-Instruct`, etc. | ✅︎ | ✅︎ |
 | `Qwen3VLForConditionalGeneration` | Qwen3-VL | T + I<sup>E+</sup> + V<sup>E+</sup> | `Qwen/Qwen3-VL-4B-Instruct`, etc. | ✅︎ | ✅︎ |
 | `Qwen3VLMoeForConditionalGeneration` | Qwen3-VL-MOE | T + I<sup>E+</sup> + V<sup>E+</sup> | `Qwen/Qwen3-VL-30B-A3B-Instruct`, etc. | ✅︎ | ✅︎ |
 | `Qwen3OmniMoeThinkerForConditionalGeneration` | Qwen3-Omni | T + I<sup>E+</sup> + V<sup>E+</sup> + A<sup>+</sup> | `Qwen/Qwen3-Omni-30B-A3B-Instruct`, `Qwen/Qwen3-Omni-30B-A3B-Thinking` | ✅︎ | ✅︎ |
@@ -744,10 +746,10 @@ Some models are supported only via the [Transformers modeling backend](#transfor
 !!! note
     `Gemma3nForConditionalGeneration` is only supported on V1 due to shared KV caching and it depends on `timm>=1.0.17` to make use of its
     MobileNet-v5 vision backbone.
-  
+
     Performance is not yet fully optimized mainly due to:
-  
-    - Both audio and vision MM encoders use `transformers.AutoModel` implementation.  
+
+    - Both audio and vision MM encoders use `transformers.AutoModel` implementation.
     - There's no PLE caching or out-of-memory swapping support, as described in [Google's blog](https://developers.googleblog.com/en/introducing-gemma-3n/). These features might be too model-specific for vLLM, and swapping in particular may be better suited for constrained setups.
 
 !!! note
@@ -797,7 +799,7 @@ The following table lists those that are tested in vLLM.
 | `SiglipModel` | SigLIP, SigLIP2 | T / I | `google/siglip-base-patch16-224`, `google/siglip2-base-patch16-224` | | |
 | `*ForConditionalGeneration`<sup>C</sup>, `*ForCausalLM`<sup>C</sup>, etc. | Generative models | \* | N/A | \* | \* |
 
-<sup>C</sup> Automatically converted into an embedding model via `--convert embed`. ([details](./pooling_models.md#model-conversion))  
+<sup>C</sup> Automatically converted into an embedding model via `--convert embed`. ([details](./pooling_models.md#model-conversion))
 \* Feature support is the same as that of the original model.
 
 ---
@@ -812,7 +814,7 @@ These models primarily support the [`LLM.score`](./pooling_models.md#llmscore) A
 | `JinaVLForSequenceClassification` | JinaVL-based | T + I<sup>E+</sup> | `jinaai/jina-reranker-m0`, etc. | ✅︎ | ✅︎ |
 | `Qwen3VLForSequenceClassification` | Qwen3-VL-Reranker | T + I<sup>E+</sup> + V<sup>E+</sup> | `Qwen/Qwen3-VL-Reranker-2B`(see note), etc. | ✅︎ | ✅︎ |
 
-<sup>C</sup> Automatically converted into a classification model via `--convert classify`. ([details](./pooling_models.md#model-conversion))  
+<sup>C</sup> Automatically converted into a classification model via `--convert classify`. ([details](./pooling_models.md#model-conversion))
 \* Feature support is the same as that of the original model.
 
 !!! note

tests/models/registry.py

@@ -112,7 +112,7 @@ class _HfExamplesInfo:
 
     use_original_num_layers: bool = False
     """
-    If True, use the original number of layers from the model config 
+    If True, use the original number of layers from the model config
     instead of minimal layers for testing.
     """
 
@@ -943,6 +943,26 @@ _MULTIMODAL_EXAMPLE_MODELS = {
         max_model_len=4096,
         min_transformers_version="4.57",
     ),
+    "Qwen3_5ForConditionalGeneration": _HfExamplesInfo(
+        os.path.join(models_path_prefix, "Qwen/Qwen3.5-9B-Instruct"),
+        max_model_len=4096,
+        min_transformers_version="5.1.0",
+    ),
+    "Qwen3_5MoeForConditionalGeneration": _HfExamplesInfo(
+        os.path.join(models_path_prefix, "Qwen/Qwen3.5-35B-A3B-Instruct"),
+        max_model_len=4096,
+        min_transformers_version="5.1.0",
+    ),
+    "Qwen3_5MTP": _HfExamplesInfo(
+        os.path.join(models_path_prefix, "Qwen/Qwen3.5-9B-Instruct"),
+        speculative_model="Qwen/Qwen3.5-9B-Instruct",
+        min_transformers_version="5.1.0",
+    ),
+    "Qwen3_5MoeMTP": _HfExamplesInfo(
+        os.path.join(models_path_prefix, "Qwen/Qwen3.5-35B-A3B-Instruct"),
+        speculative_model="Qwen/Qwen3.5-35B-A3B-Instruct",
+        min_transformers_version="5.1.0",
+    ),
     "Qwen3OmniMoeForConditionalGeneration": _HfExamplesInfo(
         os.path.join(models_path_prefix, "Qwen/Qwen3-Omni-30B-A3B-Instruct"),
         max_model_len=4096,

vllm/_custom_ops.py

@@ -19,6 +19,7 @@ from vllm.utils.torch_utils import direct_register_custom_op
 try:
     from lmslim import quant_ops 
     from lmslim import quant_tools 
+    from lmslim.layers.gemm.fp8_utils import per_token_quant_fp8
 except Exception:
     print("INFO: Please install lmslim if you want to infer gptq or awq  or w8a8 model.\n") 
 try:
@@ -1878,6 +1879,67 @@ def scaled_fp4_experts_quant(
     output_scales = output_scales.view(torch.float8_e4m3fn)
     return output, output_scales
 
+def scaled_fp8_quant(
+    input: torch.Tensor,
+    scale: Optional[torch.Tensor] = None,
+    num_token_padding: Optional[int] = None,
+    scale_ub: Optional[torch.Tensor] = None,
+    use_per_token_if_dynamic: bool = False,
+    output: Optional[torch.Tensor] = None,
+    group_shape: Optional[tuple[int, int]] = None, 
+) -> tuple[torch.Tensor, torch.Tensor]:
+    """
+    Quantize input tensor to FP8 and return quantized tensor and scale.
+    This function supports both static and dynamic quantization: If you
+    provide the scale, it will use static scaling and if you omit it,
+    the scale will be determined dynamically. The function also allows
+    optional padding of the output tensors for downstream kernels that
+    will benefit from padding.
+
+    Args:
+        input: The input tensor to be quantized to FP8
+        scale: Optional scaling factor for the FP8 quantization
+        scale_ub: Optional upper bound for scaling factor in dynamic
+            per token case
+        num_token_padding: If specified, pad the first dimension
+            of the output to at least this value.
+        use_per_token_if_dynamic: Whether to do per_tensor or per_token
+            in the dynamic quantization case.
+
+    Returns:
+        tuple[torch.Tensor, torch.Tensor]: The output tensor in FP8 and
+            scaling factor.
+    """
+    # This code assumes batch_dim and num_tokens are flattened
+    assert (input.ndim == 2)
+    shape: Union[tuple[int, int], torch.Size] = input.shape
+    # For ROCm on MI300, the output fp8 dtype is torch.float_e3m3fnuz
+    out_dtype: torch.dtype = current_platform.fp8_dtype()
+    if num_token_padding:
+        shape = (max(num_token_padding, input.shape[0]), shape[1])
+    if output is None:
+        output = torch.empty(shape, device=input.device, dtype=out_dtype)
+    else:
+        assert num_token_padding is None, \
+            "padding not supported if output passed in"
+        assert output.dtype == out_dtype
+
+    if scale is None:
+        if use_per_token_if_dynamic:
+            scale = torch.empty((shape[0], 1),
+                                device=input.device,
+                                dtype=torch.float32)
+            # torch.ops._C.dynamic_per_token_scaled_fp8_quant(
+            #     output, input.contiguous(), scale, scale_ub)
+            output, scale = per_token_quant_fp8(input.contiguous())
+        else:
+            scale = torch.zeros(1, device=input.device, dtype=torch.float32)
+            torch.ops._C.dynamic_scaled_fp8_quant(output, input, scale)
+    else:
+        assert scale.numel() == 1, f"{scale.shape}"
+        torch.ops._C.static_scaled_fp8_quant(output, input, scale)
+    return output, scale
+
 
 def silu_and_mul_scaled_fp4_experts_quant(
     input_tensor: torch.Tensor,

vllm/config/model.py

@@ -105,13 +105,13 @@ models_path_prefix = os.getenv('VLLM_OPTEST_MODELS_PATH') or os.getenv("OPTEST_M
 class ModelConfig:
     """Configuration for the model."""
 
-    model: str = os.path.join(models_path_prefix, "Qwen/Qwen3-0.6B") if models_path_prefix is not None else "Qwen/Qwen3-0.6B" 
+    model: str = os.path.join(models_path_prefix, "Qwen/Qwen3-0.6B") if models_path_prefix is not None else "Qwen/Qwen3-0.6B"
     """Name or path of the Hugging Face model to use. It is also used as the
     content for `model_name` tag in metrics output when `served_model_name` is
     not specified."""
     model_weights: str = ""
-    """Original model weights path. Used when the model is pulled from object 
-    storage (e.g., RunAI) to preserve the original URI while `model` points to 
+    """Original model weights path. Used when the model is pulled from object
+    storage (e.g., RunAI) to preserve the original URI while `model` points to
     the local directory."""
     runner: RunnerOption = "auto"
     """The type of model runner to use. Each vLLM instance only supports one
@@ -1250,7 +1250,9 @@ class ModelConfig:
                 return sum(t == 1 for t in attn_type_list[start:end])
 
             # Hybrid model Qwen3Next
-            layer_types_value = getattr(self.hf_config, "layer_types", None)
+            # layer_types_value = getattr(self.hf_config, "layer_types", None)
+            # Hybrid model Qwen3Next Qwen3.5 Series
+            layer_types_value = getattr(self.hf_text_config, "layer_types", None)
             if layer_types_value is not None:
                 if block_type == "attention":
                     return sum(

vllm/config/speculative.py

@@ -37,6 +37,7 @@ MTPModelTypes = Literal[
     "ernie_mtp",
     "exaone_moe_mtp",
     "qwen3_next_mtp",
+    "qwen3_5_mtp",
     "longcat_flash_mtp",
     "mtp",
     "pangu_ultra_moe_mtp",
@@ -246,6 +247,16 @@ class SpeculativeConfig:
                 {"n_predict": n_predict, "architectures": ["ExaoneMoeMTP"]}
             )
 
+        if hf_config.model_type in ("qwen3_5", "qwen3_5_moe"):
+            is_moe = hf_config.model_type == "qwen3_5_moe"
+            hf_config.model_type = "qwen3_5_mtp"
+            n_predict = getattr(hf_config, "mtp_num_hidden_layers", None)
+            hf_config.update(
+                {
+                    "n_predict": n_predict,
+                    "architectures": ["Qwen3_5MoeMTP" if is_moe else "Qwen3_5MTP"],
+                }
+            )
         if hf_config.model_type == "longcat_flash":
             hf_config.model_type = "longcat_flash_mtp"
             n_predict = getattr(hf_config, "num_nextn_predict_layers", 1)

vllm/envs.py

@@ -292,7 +292,15 @@ if TYPE_CHECKING:
     VLLM_USE_FUSED_FILL_RMS_CAT: bool = False
     VLLM_W8A8_BACKEND: int = 3
     VLLM_USE_PP_BALANCE = True
+    VLLM_MOE_ROUTER_CAPTURE: bool = False
+    VLLM_MOE_ROUTER_CAPTURE_DIR: str = "/tmp"
+    VLLM_MOE_ROUTER_CAPTURE_RANK: int = -1
+    VLLM_MOE_ROUTER_CAPTURE_MAX_LAYERS: int = 0
+    VLLM_MOE_ROUTER_CAPTURE_NUM_TOKENS_GT: int = -1
+    VLLM_MOE_ROUTER_CAPTURE_NUM_TOKENS_LT: int = -1
     VLLM_REJECT_SAMPLE_OPT: bool = False
+    VLLM_USE_MOE_W16A16_TRITON: bool = False
+    VLLM_V1_FAST_TOKEN_ID_COPY: bool = False
 
 
 def get_default_cache_root():
@@ -1841,14 +1849,42 @@ environment_variables: dict[str, Callable[[], Any]] = {
     # blaslt: 3 (default)
     # rocblas: others
     "VLLM_W8A8_BACKEND": lambda: int(os.getenv("VLLM_W8A8_BACKEND", "3")),
+    # Capture MoE router logits for debugging/analysis.
+    "VLLM_MOE_ROUTER_CAPTURE":
+    lambda: (os.getenv("VLLM_MOE_ROUTER_CAPTURE", "0").lower() in ("true", "1")),
+    # Output directory for MoE router capture dumps.
+    "VLLM_MOE_ROUTER_CAPTURE_DIR":
+    lambda: os.environ.get(
+        "VLLM_MOE_ROUTER_CAPTURE_DIR",
+        "/tmp",
+    ),
+    # Capture only the specified rank; set to -1 to capture all ranks.
+    "VLLM_MOE_ROUTER_CAPTURE_RANK":
+    lambda: int(os.environ.get("VLLM_MOE_ROUTER_CAPTURE_RANK", "-1")),
+    # Max number of MoE layers to record per process (0 = unlimited).
+    "VLLM_MOE_ROUTER_CAPTURE_MAX_LAYERS":
+    lambda: int(os.environ.get("VLLM_MOE_ROUTER_CAPTURE_MAX_LAYERS", "0")),
+    # Only capture when num_tokens > N (negative disables).
+    "VLLM_MOE_ROUTER_CAPTURE_NUM_TOKENS_GT":
+    lambda: int(os.environ.get("VLLM_MOE_ROUTER_CAPTURE_NUM_TOKENS_GT", "-1")),
+    # Only capture when num_tokens < N (0 disables).
+    "VLLM_MOE_ROUTER_CAPTURE_NUM_TOKENS_LT":
+    lambda: int(os.environ.get("VLLM_MOE_ROUTER_CAPTURE_NUM_TOKENS_LT", "-1")),
 
     # vllm will use optimized reject sample
     "VLLM_REJECT_SAMPLE_OPT":
         lambda: (os.getenv('VLLM_REJECT_SAMPLE_OPT', 'True').lower() in
                  ("true", "1")),
+    # Force using Triton MoE path (disable Marlin W16A16 MoE).
+    "VLLM_USE_MOE_W16A16_TRITON":
+        lambda: (os.environ.get("VLLM_USE_MOE_W16A16_TRITON", "0").lower() in
+                 ("true", "1")),
+    #If set to 1/True, enable the V1 fast token-id copy path in InputBatch.
+    "VLLM_V1_FAST_TOKEN_ID_COPY":
+        lambda: (os.environ.get("VLLM_V1_FAST_TOKEN_ID_COPY", "False").lower() in
+                    ("true", "1")),
 }
 
-
 # --8<-- [end:env-vars-definition]
 
 

vllm/model_executor/layers/fused_moe/fuse_moe_w16a16_marlin.py

@@ -397,21 +397,13 @@ def fused_experts_impl_w16a16_marlin(hidden_states: torch.Tensor,
         )
         intermediate_cache3 = intermediate_cache3.view(-1, top_k_num, K)
 
-        if envs.VLLM_USE_LIGHTOP_MOE_SUM_MUL_ADD: 
+        if envs.VLLM_USE_LIGHTOP_MOE_SUM:
             from lightop import op as op
             op.moe_sum(input=intermediate_cache3.view(*intermediate_cache3.size()),
-                    output=out_hidden_states[begin_chunk_idx:end_chunk_idx], bias=shared_output[begin_chunk_idx:end_chunk_idx], 
-                    expert_mask=None, num_local_tokens=None, factor=routed_scaling_factor)
+                output=out_hidden_states[begin_chunk_idx:end_chunk_idx], bias=None, 
+                expert_mask=None, num_local_tokens=None, factor=1.0)
         else:
-            if envs.VLLM_USE_LIGHTOP_MOE_SUM:
-                from lightop import op as op
-                op.moe_sum(input=intermediate_cache3.view(*intermediate_cache3.size()),
-                    output=out_hidden_states[begin_chunk_idx:end_chunk_idx], bias=None, 
-                    expert_mask=None, num_local_tokens=None, factor=1.0)
-            elif envs.VLLM_USE_OPT_MOE_SUM:
-                moe_reduce_dispatch(intermediate_cache3.view(*intermediate_cache3.size()), out_hidden_states[begin_chunk_idx:end_chunk_idx], begin_chunk_idx, end_chunk_idx)
-            else:
-                ops.moe_sum(intermediate_cache3.view(*intermediate_cache3.size()),
-                                out_hidden_states[begin_chunk_idx:end_chunk_idx])
+            ops.moe_sum(intermediate_cache3.view(*intermediate_cache3.size()),
+                            out_hidden_states[begin_chunk_idx:end_chunk_idx])
 
     return out_hidden_states
\ No newline at end of file

vllm/model_executor/layers/fused_moe/fused_moe.py

@@ -1612,6 +1612,7 @@ def fused_experts(
     expert_map: torch.Tensor | None = None,
     quant_config: FusedMoEQuantConfig | None = None,
     use_nn_moe: bool | None = False,
+    use_fused_gate: bool | None = False,
 ) -> torch.Tensor:
     if quant_config is None:
         quant_config = FUSED_MOE_UNQUANTIZED_CONFIG
@@ -1705,6 +1706,112 @@ def fused_experts_impl(
 ) -> torch.Tensor:
     # Check constraints.
     num_tokens = hidden_states.size(0)
+    top_k_num = topk_ids.size(1)
+    # We execute the fused_moe kernel in chunks to circumvent this issue:
+    # https://github.com/vllm-project/vllm/issues/5938
+    CHUNK_SIZE = envs.VLLM_FUSED_MOE_CHUNK_SIZE
+    M = min(num_tokens, CHUNK_SIZE)
+
+    # Optional fast path: use Marlin W16A16 fused MoE implementation when the
+    # expert weights are already packed in Marlin layout.
+    if not use_nn_moe:
+        K = hidden_states.size(1)
+
+        def _is_marlin_w16a16_packed(w1: torch.Tensor, w2: torch.Tensor) -> bool:
+            if w1.dim() != 3 or w2.dim() != 3:
+                return False
+            if w1.size(0) != w2.size(0):
+                return False
+            k_div16 = w1.size(1)
+            if k_div16 * 16 != K:
+                return False
+            if w1.size(2) % 16 != 0:
+                return False
+            twoN = w1.size(2) // 16
+            if twoN % 2 != 0:
+                return False
+            N = twoN // 2
+            if w2.size(2) != K * 16:
+                return False
+            if w2.size(1) * 16 != N:
+                return False
+            return True
+
+        is_packed = (
+            getattr(w1, "marlin_w16a16_packed", False)
+            or getattr(w2, "marlin_w16a16_packed", False)
+            or _is_marlin_w16a16_packed(w1, w2)
+        )
+
+        if is_packed:
+            if envs.VLLM_USE_MOE_W16A16_TRITON:
+                raise RuntimeError(
+                    "VLLM_USE_MOE_W16A16_TRITON=1 forces Triton MoE, but the MoE weights are "
+                    "packed in Marlin W16A16 layout. Please load unpacked weights or set "
+                    "VLLM_USE_MOE_W16A16_TRITON=0."
+                )
+
+            try:
+                from vllm.model_executor.layers.fused_moe.fuse_moe_w16a16_marlin import (
+                    fused_experts_impl_w16a16_marlin,
+                )
+            except Exception:
+                fused_experts_impl_w16a16_marlin = None  # type: ignore
+
+            if fused_experts_impl_w16a16_marlin is None:
+                raise RuntimeError(
+                    "Marlin W16A16 MoE weights are packed, but the Marlin kernel is unavailable. "
+                    "Ensure lightop/lmslim is installed and LMSLIM_USE_LIGHTOP=1."
+                )
+
+            if activation != "silu":
+                raise RuntimeError(
+                    "Marlin W16A16 MoE only supports activation='silu'."
+                )
+            if apply_router_weight_on_input:
+                raise RuntimeError(
+                    "Marlin W16A16 MoE does not support apply_router_weight_on_input=True."
+                )
+            if w1_bias is not None or w2_bias is not None:
+                raise RuntimeError(
+                    "Marlin W16A16 MoE does not support expert biases."
+                )
+
+            E = w1.size(0)
+            if global_num_experts == -1:
+                global_num_experts = E
+
+            twoN = w1.size(2) // 16
+            if envs.VLLM_USE_GLOBAL_CACHE13:
+                cache13 = get_moe_cache(
+                    top_k_num,
+                    twoN,
+                    K,
+                    device=hidden_states.device,
+                    dtype=hidden_states.dtype,
+                )
+            else:
+                cache13 = torch.empty(
+                    M * top_k_num * max(twoN, K),
+                    device=hidden_states.device,
+                    dtype=hidden_states.dtype,
+                )
+
+            return fused_experts_impl_w16a16_marlin(
+                hidden_states=hidden_states,
+                w1_marlin=w1,
+                w2_marlin=w2,
+                topk_weights=topk_weights,
+                topk_ids=topk_ids,
+                cache13=cache13,
+                inplace=inplace,
+                activation=activation,
+                apply_router_weight_on_input=apply_router_weight_on_input,
+                global_num_experts=global_num_experts,
+                expert_map=expert_map,
+                use_nn_moe=False,
+            )
+
     if use_nn_moe:
         E, _, N = w1.size()
     else:
@@ -1713,18 +1820,12 @@ def fused_experts_impl(
 
     if global_num_experts == -1:
         global_num_experts = E
-    top_k_num = topk_ids.size(1)
-    # We execute the fused_moe kernel in chunks to circumvent this issue:
-    # https://github.com/vllm-project/vllm/issues/5938
-    CHUNK_SIZE = envs.VLLM_FUSED_MOE_CHUNK_SIZE
-    M = min(num_tokens, CHUNK_SIZE)
-
     if envs.VLLM_USE_GLOBAL_CACHE13:
         cache13 = get_moe_cache(top_k_num, N,K if not use_nn_moe else w2.shape[2], device=hidden_states.device, dtype=hidden_states.dtype)
     else:
         cache13 = torch.empty(M * top_k_num * max(N, K if not use_nn_moe else w2.shape[2]), device=hidden_states.device, dtype=hidden_states.dtype)
 
-    if use_int8_w8a8 is True:
+    if use_int8_w8a8 or use_fp8_w8a8:
         return fused_experts_impl_int8(hidden_states=hidden_states,
                                        w1=w1,
                                        w2=w2,
@@ -1734,8 +1835,8 @@ def fused_experts_impl(
                                        inplace=inplace,
                                        activation=activation,
                                        apply_router_weight_on_input=apply_router_weight_on_input,
-                                       use_fp8_w8a8=False,
-                                       use_int8_w8a8=True,
+                                       use_fp8_w8a8=use_fp8_w8a8,
+                                       use_int8_w8a8=use_int8_w8a8,
                                        use_int8_w8a16=False,
                                        use_int4_w4a16=False,
                                        per_channel_quant=per_channel_quant,

vllm/model_executor/layers/fused_moe/layer.py

 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
+import functools
 import os
 from collections.abc import Callable, Iterable
 from contextlib import nullcontext
@@ -72,6 +73,64 @@ from vllm.model_executor.layers.fused_moe.fused_moe import is_power_of_two
 
 logger = init_logger(__name__)
 
+_MARLIN_W16A16_MOE_PROBE_BATCH_SIZES: tuple[int, ...] = (1, 128)
+
+
+@functools.lru_cache
+def _is_marlin_w16a16_moe_supported(
+    E: int,
+    N: int,
+    K: int,
+    top_k: int,
+    dtype: torch.dtype,
+) -> bool:
+    """Return True if lightop reports Marlin W16A16 MoE is supported.
+
+    This is a best-effort probe used to decide whether we can safely pre-pack
+    weights into Marlin layout (which would otherwise prevent fallback).
+    """
+    if not (current_platform.is_cuda_alike() and torch.cuda.is_available()):
+        return False
+    if dtype not in (torch.float16, torch.bfloat16):
+        return False
+    if K % 32 != 0 or N % 16 != 0:
+        return False
+    if E <= 0 or N <= 0 or K <= 0 or top_k <= 0:
+        return False
+
+    try:
+        from lightop import get_moe_cuda_marlin_config_w16a16
+
+        props = torch.cuda.get_device_properties(torch.cuda.current_device())
+        arch_name = getattr(props, "gcnArchName", None)
+        if isinstance(arch_name, str) and arch_name:
+            arch_name = arch_name.split(":")[0]
+        else:
+            arch_name = getattr(props, "name", None)
+        if not isinstance(arch_name, str) or not arch_name:
+            return False
+
+        arch_cu = props.multi_processor_count
+        twoN = 2 * N
+        for bs in _MARLIN_W16A16_MOE_PROBE_BATCH_SIZES:
+            _, _, status = get_moe_cuda_marlin_config_w16a16(
+                E,
+                bs,
+                twoN,
+                K,
+                K,
+                N,
+                top_k,
+                arch_name,
+                arch_cu,
+                dtype,
+            )
+            if not status:
+                return False
+        return True
+    except Exception:
+        return False
+
 
 class FusedMoeWeightScaleSupported(Enum):
     TENSOR = "tensor"
@@ -543,9 +602,9 @@ class FusedMoE(CustomOp):
         # moe_fused_gate kernel ensure that num_experts/num_expert_group does not exceed MAX_VPT=32 now. And when kernel can handle MAX_VPT > 32, we can remove this assertion.
         self.use_fused_gate = envs.VLLM_ENABLE_MOE_FUSED_GATE \
             and self.e_score_correction_bias is not None \
-                 and num_expert_group is not None \
-                    and self.global_num_experts // num_expert_group <= 32 \
-                        and is_power_of_two(e_score_correction_bias.shape[0])
+                 and num_expert_group is not None #\
+                    #and self.global_num_experts // num_expert_group <= 32 \
+                    #    and is_power_of_two(e_score_correction_bias.shape[0])
                         
         self.router = create_fused_moe_router(
             top_k=top_k,
@@ -632,9 +691,28 @@ class FusedMoE(CustomOp):
         
         if quant_config is None:
             # Not considering quant for now, temporarily
+            self._marlin_w16a16_moe_enabled = (
+                not envs.VLLM_USE_MOE_W16A16_TRITON
+                and params_dtype == moe_in_dtype
+                and not self.moe_config.has_bias
+                and self.activation == "silu"
+                and not self.apply_router_weight_on_input
+                and _is_marlin_w16a16_moe_supported(
+                    E=self.local_num_experts,
+                    N=self.intermediate_size_per_partition,
+                    K=self.hidden_size,
+                    top_k=self.top_k,
+                    dtype=moe_in_dtype,
+                )
+            )
+
             self.use_nn_moe = int(os.environ.get('MOE_NN', 1)) == 1
+            # Marlin W16A16 MoE requires the non-NN weight layout.
+            if self._marlin_w16a16_moe_enabled:
+                self.use_nn_moe = False
         else:
             self.use_nn_moe = False
+            self._marlin_w16a16_moe_enabled = False
 
         moe_quant_params = {
             "num_experts": self.local_num_experts,
@@ -671,6 +749,12 @@ class FusedMoE(CustomOp):
     # should be safe to swap out the quant_method.
     def maybe_init_modular_kernel(self) -> None:
 
+        # If this layer is configured for Marlin W16A16 path, we intentionally
+        # keep the monolithic execution route so runtime can dispatch to
+        # fused_experts_impl_w16a16_marlin when weights are packed.
+        if getattr(self, "_marlin_w16a16_moe_enabled", False):
+            return
+
         self.ensure_moe_quant_config_init()
         # routing_tables only needed for round-robin expert placement with
         # DeepEP all2all backend.

vllm/model_executor/layers/fused_moe/router_capture.py

+"""
+Utilities for capturing MoE router distributions from real workloads.
+
+This is intentionally lightweight and gated behind env vars so it has zero
+runtime impact unless explicitly enabled.
+
+Env vars (defaults from vllm.envs):
+- VLLM_MOE_ROUTER_CAPTURE=0/1: enable capture (default: 0).
+- VLLM_MOE_ROUTER_CAPTURE_DIR=/path: output directory for per-process dumps
+  (default: /tmp).
+- VLLM_MOE_ROUTER_CAPTURE_RANK=N: only capture on the given torch.distributed
+  rank (default: -1; set to -1 to capture all ranks).
+- VLLM_MOE_ROUTER_CAPTURE_MAX_LAYERS=N: max number of layers to record per
+  process (default: 0; 0 = unlimited).
+- VLLM_MOE_ROUTER_CAPTURE_NUM_TOKENS_GT=A: only record calls where router_logits
+  has num_tokens > A (default: -1; <0 = disabled).
+- VLLM_MOE_ROUTER_CAPTURE_NUM_TOKENS_LT=B: only record calls where router_logits
+  has num_tokens < B (default: -1; 0 = disabled).
+
+Output format:
+- A single `.pt` per captured num_tokens (and per rank if torch.distributed is
+  initialized).
+- Payload includes `layers_by_num_tokens: dict[str, dict[layer_name, layer_state]]`.
+- A convenience `layers` field is also included (same as
+  `layers_by_num_tokens[str(num_tokens)]`) for easy loading.
+- For each captured MoE layer, stores a list of 2D tensors
+  `router_logits_chunks: list[Tensor[num_tokens_i, num_experts]]` on CPU,
+  typically in fp16 for space efficiency.
+"""
+
+from __future__ import annotations
+
+import atexit
+import inspect
+import os
+import socket
+import threading
+import time
+from dataclasses import dataclass
+from typing import Optional
+
+import torch
+
+import vllm.envs as envs
+
+_DEFAULT_SKIP_STACK_FUNCS = ("profile_run", "_dummy_run",
+                             "determine_available_memory")
+
+
+@dataclass(frozen=True)
+class RouterCaptureConfig:
+    enabled: bool = False
+    out_dir: str = "/tmp"
+    skip_profile: bool = True
+    skip_stack_funcs: tuple[str, ...] = _DEFAULT_SKIP_STACK_FUNCS
+    only_rank: Optional[int] = 0
+    max_layers: int = 0
+    num_tokens_gt: Optional[int] = None
+    num_tokens_lt: Optional[int] = None
+
+    @staticmethod
+    def from_env() -> "RouterCaptureConfig":
+        enabled = envs.VLLM_MOE_ROUTER_CAPTURE
+        out_dir = envs.VLLM_MOE_ROUTER_CAPTURE_DIR
+        skip_profile = True
+        skip_stack_funcs = _DEFAULT_SKIP_STACK_FUNCS
+        only_rank: Optional[int] = None
+        if envs.VLLM_MOE_ROUTER_CAPTURE_RANK >= 0:
+            only_rank = envs.VLLM_MOE_ROUTER_CAPTURE_RANK
+        max_layers = envs.VLLM_MOE_ROUTER_CAPTURE_MAX_LAYERS
+        num_tokens_gt_opt = (envs.VLLM_MOE_ROUTER_CAPTURE_NUM_TOKENS_GT
+                             if envs.VLLM_MOE_ROUTER_CAPTURE_NUM_TOKENS_GT >= 0
+                             else None)
+        num_tokens_lt_opt = (envs.VLLM_MOE_ROUTER_CAPTURE_NUM_TOKENS_LT
+                             if envs.VLLM_MOE_ROUTER_CAPTURE_NUM_TOKENS_LT > 0
+                             else None)
+
+        # Per-size mode requires an explicit token-count filter to avoid
+        # unbounded captures by default.
+        if num_tokens_gt_opt is None and num_tokens_lt_opt is None:
+            enabled = False
+        if (num_tokens_gt_opt is not None and num_tokens_lt_opt is not None
+                and num_tokens_gt_opt >= num_tokens_lt_opt):
+            enabled = False
+        return RouterCaptureConfig(enabled=enabled,
+                                   out_dir=out_dir,
+                                   skip_profile=skip_profile,
+                                   skip_stack_funcs=skip_stack_funcs,
+                                   only_rank=only_rank,
+                                   max_layers=max_layers,
+                                   num_tokens_gt=num_tokens_gt_opt,
+                                   num_tokens_lt=num_tokens_lt_opt)
+
+
+def _in_profile_run(skip_stack_funcs: tuple[str, ...]) -> bool:
+    """
+    Best-effort detection for vLLM startup profiling/warmup runs.
+
+    Startup warmups often execute MoE kernels with synthetic shapes. When
+    enabled, skip captures from these stacks so the first capture comes from a
+    real request.
+    """
+    if not skip_stack_funcs:
+        return False
+    frame = inspect.currentframe()
+    try:
+        while frame is not None:
+            name = frame.f_code.co_name
+            if name in skip_stack_funcs:
+                return True
+            frame = frame.f_back
+    finally:
+        # Avoid reference cycles.
+        del frame
+    return False
+
+
+class _RouterCapture:
+
+    def __init__(self, cfg: RouterCaptureConfig) -> None:
+        self.cfg = cfg
+        # Bucket captures by token count.
+        self._layers_by_num_tokens: dict[int, dict[str, dict[str, object]]] = {}
+        self._layer_names: set[str] = set()
+        self._completed_num_tokens: set[int] = set()
+        self._lock = threading.Lock()
+        self._flush_counter = 0
+
+        self._pid = os.getpid()
+        self._host = socket.gethostname()
+        self._start_time = time.time()
+
+        os.makedirs(cfg.out_dir, exist_ok=True)
+        atexit.register(self.flush)
+
+    def _bucket_for_num_tokens(self, num_tokens: int) -> Optional[int]:
+        """Return the per-size bucket key for this record call, or None if filtered."""
+        if self.cfg.num_tokens_gt is None and self.cfg.num_tokens_lt is None:
+            return None
+        if self.cfg.num_tokens_gt is not None:
+            if int(num_tokens) <= int(self.cfg.num_tokens_gt):
+                return None
+        if self.cfg.num_tokens_lt is not None:
+            if int(num_tokens) >= int(self.cfg.num_tokens_lt):
+                return None
+        bucket_num_tokens = int(num_tokens)
+        if bucket_num_tokens != 0 and bucket_num_tokens in self._completed_num_tokens:
+            return None
+        return bucket_num_tokens
+
+    def _snapshot_layers_by_num_tokens(
+        self,
+        layers_by_num_tokens: dict[int, dict[str, dict[str, object]]],
+    ) -> dict[int, dict[str, dict[str, object]]]:
+        snapshot: dict[int, dict[str, dict[str, object]]] = {}
+        for num_tokens, bucket in layers_by_num_tokens.items():
+            bucket_snapshot: dict[str, dict[str, object]] = {}
+            for layer_name, state in bucket.items():
+                chunks = state.get("router_logits_chunks", [])
+                bucket_snapshot[layer_name] = {
+                    "num_experts": int(state.get("num_experts", 0)),
+                    "num_tokens": int(state.get("num_tokens", 0)),
+                    "router_logits_chunks": list(chunks),
+                }
+            snapshot[int(num_tokens)] = bucket_snapshot
+        return snapshot
+
+    @torch.no_grad()
+    def record(self, layer_name: str, router_logits: torch.Tensor,
+               top_k: int) -> None:
+        if self.cfg.skip_profile and _in_profile_run(self.cfg.skip_stack_funcs):
+            return
+        if self.cfg.only_rank is not None:
+            rank = _get_rank()
+            if rank is not None and rank != self.cfg.only_rank:
+                return
+        if router_logits.dim() != 2:
+            return
+        num_tokens, num_experts = router_logits.shape
+        if num_tokens == 0 or num_experts == 0:
+            return
+        bucket_num_tokens = self._bucket_for_num_tokens(int(num_tokens))
+        if bucket_num_tokens is None:
+            return
+
+        # Limit the number of recorded layers to avoid unbounded dumps.
+        if layer_name not in self._layer_names:
+            if self.cfg.max_layers != 0 and len(self._layer_names) >= self.cfg.max_layers:
+                return
+            self._layer_names.add(layer_name)
+
+        # Store on CPU to avoid consuming GPU memory during long runs.
+        # fp16 is typically sufficient because we primarily care about
+        # distribution and relative ordering (top-k), not exact values.
+        router_logits_cpu = router_logits.detach()
+        if router_logits_cpu.is_cuda:
+            router_logits_cpu = router_logits_cpu.to(device="cpu",
+                                                     dtype=torch.float16)
+        else:
+            router_logits_cpu = router_logits_cpu.to(dtype=torch.float16)
+
+        bucket_snapshot: Optional[dict[str, dict[str, object]]] = None
+        should_flush = False
+        with self._lock:
+            bucket = self._layers_by_num_tokens.setdefault(bucket_num_tokens, {})
+            if layer_name in bucket:
+                return
+            bucket[layer_name] = {
+                "num_experts": int(num_experts),
+                "num_tokens": int(num_tokens),
+                "router_logits_chunks": [router_logits_cpu],
+            }
+            if self.cfg.max_layers != 0 and len(bucket) >= int(self.cfg.max_layers):
+                should_flush = True
+                bucket_snapshot = self._snapshot_layers_by_num_tokens(
+                    {int(bucket_num_tokens): bucket})[int(bucket_num_tokens)]
+                self._completed_num_tokens.add(int(bucket_num_tokens))
+                self._layers_by_num_tokens.pop(int(bucket_num_tokens), None)
+
+        if should_flush and bucket_snapshot is not None:
+            self._flush_payload(
+                layers_by_num_tokens={int(bucket_num_tokens): bucket_snapshot},
+                file_tag=f"nt{int(bucket_num_tokens)}",
+            )
+
+    def _flush_payload(
+        self,
+        *,
+        layers_by_num_tokens: dict[int, dict[str, dict[str, object]]],
+        file_tag: Optional[str] = None,
+    ) -> Optional[str]:
+        if not self.cfg.enabled:
+            return None
+        if self.cfg.only_rank is not None:
+            rank = _get_rank()
+            if rank is not None and rank != self.cfg.only_rank:
+                return None
+
+        rank = _get_rank()
+        now = time.time()
+        ts = time.strftime("%Y%m%d_%H%M%S", time.localtime(now))
+        ts_us = int(now * 1_000_000)
+        with self._lock:
+            flush_idx = self._flush_counter
+            self._flush_counter += 1
+        rank_str = f"rank{rank}" if rank is not None else "rankNA"
+        tag = f"{file_tag}_" if file_tag else ""
+        out_path = os.path.join(
+            self.cfg.out_dir,
+            f"moe_router_stats_{tag}{ts_us}_{self._host}_{rank_str}_pid{self._pid}_flush{flush_idx}.pt",
+        )
+
+        layers_by_num_tokens_out: dict[str, object] = {}
+        for num_tokens, bucket in layers_by_num_tokens.items():
+            bucket_out: dict[str, object] = {}
+            for layer_name, state in bucket.items():
+                bucket_out[layer_name] = {
+                    "num_experts": int(state["num_experts"]),
+                    "num_tokens": int(state["num_tokens"]),
+                    "router_logits_chunks":
+                    state["router_logits_chunks"],  # type: ignore[typeddict-item]
+                }
+            layers_by_num_tokens_out[str(int(num_tokens))] = bucket_out
+
+        payload: dict[str, object] = {
+            "meta": {
+                "timestamp": ts,
+                "timestamp_us": ts_us,
+                "flush_index": int(flush_idx),
+                "host": self._host,
+                "pid": self._pid,
+                "rank": rank,
+                "wall_time_s": float(now - self._start_time),
+            },
+            "layers_by_num_tokens": layers_by_num_tokens_out,
+        }
+
+        # Backward-compatible convenience field when there is a single bucket.
+        if len(layers_by_num_tokens) == 1:
+            (only_bucket_key, ) = layers_by_num_tokens.keys()
+            payload["layers"] = layers_by_num_tokens_out[str(int(only_bucket_key))]
+
+        try:
+            torch.save(payload, out_path)
+        except Exception:
+            return None
+        return out_path
+
+    def flush(self) -> Optional[str]:
+        with self._lock:
+            if not self._layers_by_num_tokens:
+                return None
+            snapshot = self._snapshot_layers_by_num_tokens(self._layers_by_num_tokens)
+
+        return self._flush_payload(layers_by_num_tokens=snapshot)
+
+    def reset(self) -> None:
+        with self._lock:
+            self._layers_by_num_tokens.clear()
+            self._layer_names.clear()
+            self._completed_num_tokens.clear()
+            self._start_time = time.time()
+
+
+_CAPTURE: Optional[_RouterCapture] = None
+_CAPTURE_DISABLED: bool = False
+
+
+def _disable_global_capture() -> None:
+    global _CAPTURE, _CAPTURE_DISABLED
+    _CAPTURE = None
+    _CAPTURE_DISABLED = True
+
+
+def _get_rank() -> Optional[int]:
+    if torch.distributed.is_available() and torch.distributed.is_initialized():
+        try:
+            return torch.distributed.get_rank()
+        except Exception:
+            return None
+    return None
+
+
+def _get_capture() -> Optional[_RouterCapture]:
+    global _CAPTURE, _CAPTURE_DISABLED
+    if _CAPTURE_DISABLED:
+        return None
+    if _CAPTURE is not None:
+        return _CAPTURE
+    cfg = RouterCaptureConfig.from_env()
+    if not cfg.enabled:
+        _disable_global_capture()
+        return None
+    if cfg.only_rank is not None:
+        rank = _get_rank()
+        if rank is not None and rank != cfg.only_rank:
+            _disable_global_capture()
+            return None
+    _CAPTURE = _RouterCapture(cfg)
+    return _CAPTURE
+
+
+@torch.no_grad()
+def maybe_record_router_logits(*, layer_name: str, router_logits: torch.Tensor,
+                              top_k: int) -> None:
+    capture = _get_capture()
+    if capture is None:
+        return
+    capture.record(layer_name=layer_name, router_logits=router_logits, top_k=top_k)
+
+
+def maybe_flush_router_capture(*, reset: bool = False) -> Optional[str]:
+    """Flush capture buffers to disk without exiting the process."""
+    capture = _get_capture()
+    if capture is None:
+        return None
+    out_path = capture.flush()
+    if out_path is not None and reset:
+        capture.reset()
+    return out_path

vllm/model_executor/layers/fused_moe/unquantized_fused_moe_method.py

@@ -32,6 +32,7 @@ from vllm.model_executor.layers.fused_moe.oracle.unquantized import (
     make_unquantized_moe_kernel,
     select_unquantized_moe_backend,
 )
+from vllm.model_executor.layers.fused_moe.fused_moe import fused_experts
 from vllm.model_executor.utils import replace_parameter, set_weight_attrs
 from vllm.platforms import current_platform
 from vllm.platforms.interface import CpuArchEnum
@@ -230,6 +231,87 @@ class UnquantizedFusedMoEMethod(FusedMoEMethodBase, CustomOp):
     def process_weights_after_loading(self, layer: torch.nn.Module) -> None:
         super().process_weights_after_loading(layer)
 
+        # If Marlin W16A16 MoE is supported, pre-pack weights once during the
+        # post-load hook and replace parameters with the packed layout.
+        #
+        # This avoids first-run packing peaks during KV cache profiling and
+        # keeps only one copy of weights resident on GPU in steady state.
+        if (
+            getattr(layer, "_marlin_w16a16_moe_enabled", False)
+            and current_platform.is_cuda_alike()
+            and not getattr(layer, "use_nn_moe", False)
+            and not getattr(layer, "_marlin_w16a16_moe_packed", False)
+        ):
+            w1 = layer.w13_weight
+            w2 = layer.w2_weight
+            if (
+                w1.is_cuda
+                and w2.is_cuda
+                and w1.dtype in (torch.float16, torch.bfloat16)
+                and w2.dtype in (torch.float16, torch.bfloat16)
+            ):
+                try:
+                    if w1.dim() != 3 or w2.dim() != 3 or w1.size(0) != w2.size(0):
+                        raise RuntimeError("Unexpected MoE weight shapes")
+
+                    twoN, K = w1.size(1), w1.size(2)
+                    if w2.size(1) != K:
+                        raise RuntimeError("Unexpected MoE w2 layout")
+
+                    N = w2.size(2)
+                    if twoN != 2 * N:
+                        raise RuntimeError("Unexpected MoE hidden dims")
+
+                    if K % 32 != 0 or N % 16 != 0:
+                        raise RuntimeError("Marlin packing requires alignment")
+
+                    from torch.nn.parameter import Parameter
+
+                    from vllm.model_executor.layers.fused_moe.marlin_quant import (
+                        w16a16_marlin_weight,
+                    )
+
+                    def _pack_per_expert(weight: torch.Tensor) -> torch.Tensor:
+                        num_experts = weight.shape[0]
+                        packed0 = w16a16_marlin_weight(weight[0]).contiguous()
+                        packed = packed0.new_empty((num_experts,) + packed0.shape)
+                        packed[0].copy_(packed0)
+                        del packed0
+
+                        for i in range(1, num_experts):
+                            tmp = w16a16_marlin_weight(weight[i]).contiguous()
+                            packed[i].copy_(tmp)
+                            del tmp
+                        return packed
+
+                    with torch.no_grad():
+                        w1_packed = _pack_per_expert(w1)
+                        w2_packed = _pack_per_expert(w2)
+
+                        new_w1 = Parameter(w1_packed, requires_grad=False)
+                        new_w2 = Parameter(w2_packed, requires_grad=False)
+
+                        # Preserve any custom weight attributes (e.g. loaders).
+                        if hasattr(w1, "__dict__"):
+                            for k, v in w1.__dict__.items():
+                                setattr(new_w1, k, v)
+                        if hasattr(w2, "__dict__"):
+                            for k, v in w2.__dict__.items():
+                                setattr(new_w2, k, v)
+
+                        setattr(new_w1, "marlin_w16a16_packed", True)
+                        setattr(new_w2, "marlin_w16a16_packed", True)
+
+                        layer.w13_weight = new_w1
+                        layer.w2_weight = new_w2
+                        layer._marlin_w16a16_moe_packed = True
+
+                    return
+                except Exception:
+                    # If packing dependencies are unavailable, fall back to the
+                    # standard (non-Marlin) layouts.
+                    pass
+
         # Padding the weight for better performance on ROCm
         layer.w13_weight.data = self._maybe_pad_weight(layer.w13_weight.data)
         layer.w2_weight.data = self._maybe_pad_weight(layer.w2_weight.data)
@@ -289,7 +371,6 @@ class UnquantizedFusedMoEMethod(FusedMoEMethodBase, CustomOp):
         topk_weights: torch.Tensor,
         topk_ids: torch.Tensor,
         use_nn_moe: bool | None = False,
-        use_fused_gate: bool | None = False,
     ) -> torch.Tensor | tuple[torch.Tensor, torch.Tensor]:
         return self.forward(
             layer=layer,
@@ -297,7 +378,6 @@ class UnquantizedFusedMoEMethod(FusedMoEMethodBase, CustomOp):
             topk_weights=topk_weights,
             topk_ids=topk_ids,
             use_nn_moe=use_nn_moe,
-            use_fused_gate=use_fused_gate,
         )
 
     def get_fused_moe_quant_config(self, layer: torch.nn.Module) -> FusedMoEQuantConfig:
@@ -317,6 +397,25 @@ class UnquantizedFusedMoEMethod(FusedMoEMethodBase, CustomOp):
         topk_ids: torch.Tensor,
         use_nn_moe: bool | None = False,
     ) -> torch.Tensor | tuple[torch.Tensor, torch.Tensor]:
+        if (
+            getattr(layer, "_marlin_w16a16_moe_enabled", False)
+            and getattr(layer, "_marlin_w16a16_moe_packed", False)
+        ):
+            return fused_experts(
+                hidden_states=x,
+                w1=layer.w13_weight,
+                w2=layer.w2_weight,
+                topk_weights=topk_weights,
+                topk_ids=topk_ids,
+                inplace=self.allow_inplace,
+                activation=layer.activation,
+                apply_router_weight_on_input=layer.apply_router_weight_on_input,
+                global_num_experts=layer.global_num_experts,
+                expert_map=layer.expert_map,
+                quant_config=self.get_fused_moe_quant_config(layer),
+                use_nn_moe=use_nn_moe,
+            )
+
         assert self.kernel is not None
         return self.kernel(
             hidden_states=x,

vllm/model_executor/layers/mamba/abstract.py

@@ -43,7 +43,8 @@ class MambaBase(AttentionLayerBase):
     def get_kv_cache_spec(self, vllm_config: VllmConfig) -> KVCacheSpec | None:
         if (
             vllm_config.speculative_config is not None
-            and vllm_config.model_config.hf_config.model_type not in ["qwen3_next"]
+            and vllm_config.model_config.hf_config.model_type
+            not in ["qwen3_next", "qwen3_5", "qwen3_5_moe"]
         ):
             raise NotImplementedError(
                 "Mamba with speculative decoding is not supported yet."

vllm/model_executor/layers/mamba/mamba_mixer2.py

@@ -44,6 +44,7 @@ from vllm.model_executor.utils import set_weight_attrs
 from vllm.utils.torch_utils import direct_register_custom_op
 from vllm.v1.attention.backend import AttentionMetadata
 from vllm.v1.attention.backends.mamba2_attn import Mamba2AttentionMetadata
+import vllm.envs as envs
 
 # Added by the IBM Team, 2024
 
@@ -170,6 +171,15 @@ def mamba_v2_sharded_weight_loader(
     def loader(param: torch.Tensor, loaded_weight: torch.Tensor) -> None:
         # - track boundary of (sharded) param, and loaded_weight, respectively
         boundary, loaded_boundary = 0, 0
+        
+        if envs.VLLM_USE_NN:
+            loaded_total_dim = sum(full_dim - extra
+                               for full_dim, extra, _ in shard_spec)
+            param_out_axis = 0 if param.dim() == 1 else (param.dim() - 1)
+            loaded_out_axis = 0
+            if (loaded_weight.dim() > 1 and loaded_weight.shape[-1] == loaded_total_dim
+                    and loaded_weight.shape[0] != loaded_total_dim):
+                loaded_out_axis = loaded_weight.dim() - 1
 
         # - iterate over the shard specs
         for full_dim, extra, duplicate_groups in shard_spec:
@@ -201,13 +211,39 @@ def mamba_v2_sharded_weight_loader(
             # - the ignore is for a mundane mypy error as it does not
             #   seem to handle slices well.
             # https://github.com/python/mypy/issues/2410
-            param.data[
-                boundary : (boundary + take), ...  # type: ignore[misc]
-            ] = loaded_weight[
-                loaded_start_idx : (
-                    loaded_start_idx + take
-                )  # type: ignore[misc]
-            ]  # type: ignore[misc]
+            if envs.VLLM_USE_NN:
+                if take > 0:
+                    param_slice = param.data.narrow(param_out_axis, boundary, take)
+                    loaded_slice = loaded_weight.narrow(loaded_out_axis,
+                                                        loaded_start_idx, take)
+
+                    if (param_slice.dim() == loaded_slice.dim() + 1
+                            and param_slice.shape[1] == 1):
+                        loaded_slice = loaded_slice.unsqueeze(1)
+                    elif (loaded_slice.dim() == param_slice.dim() + 1
+                        and loaded_slice.shape[1] == 1):
+                        loaded_slice = loaded_slice.squeeze(1)
+
+                    if param_slice.shape != loaded_slice.shape:
+                        loaded_slice = loaded_slice.permute(*reversed(range(loaded_slice.dim())))
+
+                    if param_slice.shape != loaded_slice.shape:
+                        raise RuntimeError(
+                            "mamba_v2_sharded_weight_loader shape mismatch: "
+                            f"param_slice={tuple(param_slice.shape)} "
+                            f"loaded_slice={tuple(loaded_slice.shape)} "
+                            f"(param_out_axis={param_out_axis}, "
+                            f"loaded_out_axis={loaded_out_axis})")
+
+                    param_slice.copy_(loaded_slice)
+            else:
+                param.data[
+                    boundary : (boundary + take), ...  # type: ignore[misc]
+                ] = loaded_weight[
+                    loaded_start_idx : (
+                        loaded_start_idx + take
+                    )  # type: ignore[misc]
+                ]  # type: ignore[misc]
 
             # move indexing boundaries
             boundary += shard_size
@@ -428,9 +464,13 @@ class MambaMixer2(MambaBase, CustomOp):
         # `ColumnParallelLinear` and `MergedColumnParallelLinear`,
         # and `set_weight_attrs` doesn't allow to override it
         self.conv1d.weight.data = self.conv1d.weight.data.unsqueeze(1)
-        conv_weights = self.conv1d.weight.view(
-            self.conv1d.weight.size(0), self.conv1d.weight.size(2)
-        )
+        if envs.VLLM_USE_NN:
+            conv_weights = self.conv1d.weight.squeeze(1).transpose(
+                0, 1).contiguous()
+        else:
+            conv_weights = self.conv1d.weight.view(
+                self.conv1d.weight.size(0), self.conv1d.weight.size(2)
+            )
         self.register_buffer("conv_weights", conv_weights, persistent=False)
 
         # - these are TPed by heads to reduce the size of the

vllm/model_executor/layers/mamba/mamba_utils.py

@@ -80,9 +80,13 @@ class MambaStateDtypeCalculator:
         cls,
         model_dtype: ModelDType | torch.dtype,
         mamba_cache_dtype: MambaDType,
+        mamba_ssm_cache_dtype: MambaDType = "auto",
     ) -> tuple[torch.dtype, torch.dtype]:
-        state_dtype = get_kv_cache_torch_dtype(mamba_cache_dtype, model_dtype)
-        return (state_dtype, state_dtype)
+        # state_dtype = get_kv_cache_torch_dtype(mamba_cache_dtype, model_dtype)
+        # return (state_dtype, state_dtype)
+        return cls._mamba_state_dtype(
+            model_dtype, mamba_cache_dtype, mamba_ssm_cache_dtype
+        )
 
     @classmethod
     def kda_state_dtype(

vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors_moe.py

@@ -1109,22 +1109,28 @@ class CompressedTensorsW8A8Fp8MoEMethod(CompressedTensorsMoEMethod):
         x: torch.Tensor,
         topk_weights: torch.Tensor,
         topk_ids: torch.Tensor,
+        use_nn_moe: bool | None = False,
+        use_fused_gate: bool | None = False,
+
     ) -> torch.Tensor | tuple[torch.Tensor, torch.Tensor]:
         assert not self.is_monolithic
         assert self.kernel is not None
-        return self.kernel(
-            x,
-            layer.w13_weight,
-            layer.w2_weight,
-            topk_weights,
-            topk_ids,
-            inplace=self.use_inplace,
+        from vllm.model_executor.layers.fused_moe import fused_experts
+
+        return fused_experts(
+            hidden_states=x,
+            w1=layer.w13_weight,
+            w2=layer.w2_weight,
+            topk_weights=topk_weights,
+            topk_ids=topk_ids,
+            inplace=True,
             activation=layer.activation,
+            apply_router_weight_on_input=layer.apply_router_weight_on_input,
             global_num_experts=layer.global_num_experts,
-            # TODO(rob): investigate the disable_expert_map introduced by:
-            # https://github.com/vllm-project/vllm/commit/84166fee9770e6fba71a96978b3e7d149392fb28 # noqa: E501
             expert_map=layer.expert_map,
-            apply_router_weight_on_input=layer.apply_router_weight_on_input,
+            quant_config=self.moe_quant_config,
+            use_fused_gate=use_fused_gate,
+            use_nn_moe=False,
         )
 
     @property

vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors_moe_marlin.py

@@ -28,6 +28,7 @@ from vllm.model_executor.layers.fused_moe import (
 )
 try:
     from lmslim.layers.fused_moe.fuse_moe_int8_marlin import fused_experts_impl_int8_marlin
+    from lmslim.layers.fused_moe.fuse_moe_fp8_marlin import fused_experts_impl_fp8_marlin
 except Exception:
     print("INFO: Please install lmslim if you want to infer the quantitative model of moe.\n")
 
@@ -35,9 +36,32 @@ logger = init_logger(__name__)
 
 __all__ = [
     "CompressedTensorsW8A8Int8MarlinMoEMethod",
+    "CompressedTensorsW8A8FP8MarlinMoEMethod",
 ]
 
 
+def fp32_to_fp8_e4m3fn(t: torch.Tensor) -> torch.Tensor:
+    """更合理的FP32到Float8_e4m3fn转换，使用最近值而不是简单舍弃尾数"""
+    # torch.float8_e4m3fn的数值范围约[-448, 448]
+    fp8_min, fp8_max = -448.0, 448.0
+    t_clamped = t.clamp(min=fp8_min, max=fp8_max)
+    # 保证不会下溢到0
+    # 转换前到float16再转fp8可能提升精度（float8实现本身通常通过float16做rounding）
+    t_fp16 = t_clamped.to(torch.float16)
+    return t_fp16.to(torch.float8_e4m3fn)
+
+
+def w8a8_fp8_nt_kpack2_marlin_weight(w8a8_w,  # [size_n, size_k// 2 ]
+                                     k_tile=16,
+                                     n_tile=16, ):
+    size_n, size_k = w8a8_w.shape
+    assert size_n % k_tile == 0 and size_k % n_tile == 0, "k_tile / n_tile 必须能整除对应维度"
+
+    w8a8_w = w8a8_w.reshape((size_n // n_tile, n_tile, size_k // k_tile, k_tile))
+    w8a8_w = w8a8_w.permute((0, 2, 1, 3)).contiguous()
+    w8a8_w = w8a8_w.reshape((size_n // k_tile, size_k * k_tile))
+    return w8a8_w
+
 class CompressedTensorsMarlinMoEMethod(FusedMoEMethodBase):
     def __init_(self, moe: FusedMoEConfig):
         super().__init__(moe)
@@ -52,12 +76,191 @@ class CompressedTensorsMarlinMoEMethod(FusedMoEMethodBase):
         weight_quant = quant_config.target_scheme_map["Linear"].get("weights")
         input_quant = quant_config.target_scheme_map["Linear"].get(
             "input_activations")
-        if quant_config._is_dynamic_token_w8a8(weight_quant, input_quant):
+        if quant_config._is_fp8_w8a8(weight_quant, input_quant):
+            return CompressedTensorsW8A8FP8MarlinMoEMethod(quant_config, layer.moe_config)
+        elif quant_config._is_dynamic_token_w8a8(weight_quant, input_quant):
             return CompressedTensorsW8A8Int8MarlinMoEMethod(quant_config, layer.moe_config)
         else:
             raise RuntimeError(
                 f"Slimquant_marlin does not support the FusedMoe scheme: {weight_quant}, {input_quant}")
 
+
+class CompressedTensorsW8A8FP8MarlinMoEMethod(CompressedTensorsMarlinMoEMethod):
+    def __init__(
+            self,
+            quant_config: "CompressedTensorsMarlinConfig",  # type: ignore # noqa E501
+            moe: FusedMoEConfig
+    ):
+        self.quant_config = quant_config
+        super().__init__(moe)
+        self.weight_quant = self.quant_config.target_scheme_map["Linear"].get(
+            "weights")
+        self.input_quant = self.quant_config.target_scheme_map["Linear"].get(
+            "input_activations")
+
+        per_channel = (
+                self.weight_quant.strategy == QuantizationStrategy.CHANNEL
+                and self.input_quant.strategy == QuantizationStrategy.TOKEN)
+        if not per_channel:
+            raise ValueError(
+                "For FP8 Fused MoE layers, we require channelwise, "
+                "dynamic per token quantization. Found "
+                f"{self.weight_quant}, {self.input_quant}")
+
+        self.static_input_scales = not self.input_quant.dynamic
+        if self.static_input_scales:
+            raise ValueError(
+                "For FP8 Fused MoE layers, we require channelwise, "
+                "dynamic per token quantization. Found static input scales.")
+        self.fused_experts = self.fused_moe_forward
+
+    def get_fused_moe_quant_config(
+            self, layer: torch.nn.Module) -> Optional[FusedMoEQuantConfig]:
+        return None
+
+    def create_weights(self, layer: torch.nn.Module, num_experts: int,
+                       hidden_size: int, intermediate_size_per_partition: int,
+                       params_dtype: torch.dtype, **extra_weight_attrs):
+
+        params_dtype = torch.float8_e4m3fn
+
+        # WEIGHTS
+        w13_weight = torch.nn.Parameter(torch.empty(
+            num_experts,
+            2 * intermediate_size_per_partition,
+            hidden_size,
+            dtype=params_dtype),
+            requires_grad=False)
+        layer.register_parameter("w13_weight", w13_weight)
+        set_weight_attrs(w13_weight, extra_weight_attrs)
+
+        w2_weight = torch.nn.Parameter(torch.empty(
+            num_experts,
+            hidden_size,
+            intermediate_size_per_partition,
+            dtype=params_dtype),
+            requires_grad=False)
+        layer.register_parameter("w2_weight", w2_weight)
+        set_weight_attrs(w2_weight, extra_weight_attrs)
+
+        # WEIGHT_SCALES
+        assert self.weight_quant.strategy == QuantizationStrategy.CHANNEL
+        w13_weight_scale = torch.nn.Parameter(torch.ones(
+            num_experts,
+            2 * intermediate_size_per_partition,
+            1,
+            dtype=torch.float32),
+            requires_grad=False)
+        layer.register_parameter("w13_weight_scale", w13_weight_scale)
+        w2_weight_scale = torch.nn.Parameter(torch.ones(num_experts,
+                                                        hidden_size,
+                                                        1,
+                                                        dtype=torch.float32),
+                                             requires_grad=False)
+        layer.register_parameter("w2_weight_scale", w2_weight_scale)
+        # Add PER-CHANNEL quantization for FusedMoE.weight_loader.
+        extra_weight_attrs.update(
+            {"quant_method": FusedMoeWeightScaleSupported.CHANNEL.value})
+        set_weight_attrs(w13_weight_scale, extra_weight_attrs)
+        set_weight_attrs(w2_weight_scale, extra_weight_attrs)
+
+        # INPUT_SCALES
+        assert not self.static_input_scales
+        layer.w13_input_scale = None
+        layer.w2_input_scale = None
+
+    def process_weights_after_loading(self, layer: torch.nn.Module) -> None:
+        w1_marlin_list = []
+        for ii in range(layer.w13_weight.shape[0]):
+            w1_marlin_in = get_w8a8_int8_marlin_weights(layer.w13_weight[ii])
+            w1_marlin_list.append(w1_marlin_in.float() if w1_marlin_in.dtype == torch.float8_e4m3fn else w1_marlin_in)
+        w1_marlin = torch.stack(w1_marlin_list, dim=0)
+        w1_marlin = fp32_to_fp8_e4m3fn(w1_marlin)
+
+        del w1_marlin_list
+        w2_marlin_list = []
+        for ii in range(layer.w2_weight.shape[0]):
+            w2_marlin_in = get_w8a8_int8_marlin_weights(layer.w2_weight[ii])
+            w2_marlin_list.append(w2_marlin_in.float() if w2_marlin_in.dtype == torch.float8_e4m3fn else w2_marlin_in)
+        w2_marlin = torch.stack(w2_marlin_list, dim=0)
+        w2_marlin = fp32_to_fp8_e4m3fn(w2_marlin)
+        layer.w13_weight = Parameter(w1_marlin, requires_grad=False)
+        layer.w2_weight = Parameter(w2_marlin, requires_grad=False)
+
+    def fused_moe_forward(
+            self,
+            layer: torch.nn.Module,
+            x: torch.Tensor,
+            topk_weights: torch.Tensor,
+            topk_ids: torch.Tensor,
+            global_num_experts: int = -1,
+            expert_map: Optional[torch.Tensor] = None,
+            apply_router_weight_on_input: bool = False,
+            activation: str = "silu",
+            routed_scaling_factor: Optional[float] = None,
+            shared_output: Optional[torch.Tensor] = None,
+    ):
+
+        return fused_experts_impl_fp8_marlin(
+            hidden_states=x,
+            w1=layer.w13_weight,
+            w2=layer.w2_weight,
+            topk_weights=topk_weights,
+            topk_ids=topk_ids,
+            inplace=True,
+            activation=activation,
+            apply_router_weight_on_input=apply_router_weight_on_input,
+            use_fp8_w8a8=True,
+            per_channel_quant=True,
+            global_num_experts=global_num_experts,
+            expert_map=expert_map,
+            w1_scale=layer.w13_weight_scale,
+            w2_scale=layer.w2_weight_scale,
+            a1_scale=layer.w13_input_scale,
+            a2_scale=layer.w2_input_scale,
+            use_nn_moe=False,
+            shared_output=shared_output,
+            routed_scaling_factor=routed_scaling_factor)
+
+    def apply(
+            self,
+            layer: torch.nn.Module,
+            x: torch.Tensor,
+            topk_weights: torch.Tensor,
+            topk_ids: torch.Tensor,
+            global_num_experts: int = -1,
+            expert_map: Optional[torch.Tensor] = None,
+            custom_routing_function: Optional[Callable] = None,
+            scoring_func: str = "softmax",
+            e_score_correction_bias: Optional[torch.Tensor] = None,
+            apply_router_weight_on_input: bool = False,
+            activation: str = "silu",
+            enable_eplb: bool = False,
+            use_nn_moe: Optional[bool] = False,
+            routed_scaling_factor: Optional[float] = None,
+            use_fused_gate: Optional[bool] = False,
+            expert_load_view: Optional[torch.Tensor] = None,
+            logical_to_physical_map: Optional[torch.Tensor] = None,
+            logical_replica_count: Optional[torch.Tensor] = None,
+            shared_output: Optional[torch.Tensor] = None,
+    ) -> torch.Tensor:
+        if enable_eplb:
+            raise NotImplementedError(
+                "EPLB not supported for "
+                "`CompressedTensorsW8A8Int8MoEMethod` yet.")
+
+        return self.fused_experts(
+            layer=layer,
+            x=x,
+            topk_weights=topk_weights,
+            topk_ids=topk_ids,
+            global_num_experts=global_num_experts,
+            expert_map=expert_map,
+            apply_router_weight_on_input=apply_router_weight_on_input,
+            activation=activation,
+            routed_scaling_factor=routed_scaling_factor,
+            shared_output=shared_output, )
+    
 class CompressedTensorsW8A8Int8MarlinMoEMethod(CompressedTensorsMarlinMoEMethod):
     def __init__(
             self,

vllm/model_executor/layers/quantization/compressed_tensors/schemes/compressed_tensors_w8a8_fp8.py

@@ -2,7 +2,8 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 from collections.abc import Callable
-
+from typing import Optional
+from vllm import envs
 import torch
 from compressed_tensors.quantization import QuantizationArgs, QuantizationStrategy
 from torch.nn import Parameter
@@ -40,7 +41,6 @@ from vllm.model_executor.parameter import (
     ChannelQuantScaleParameter,
     PerTensorScaleParameter,
 )
-
 __all__ = ["CompressedTensorsW8A8Fp8"]
 
 strategy_to_parameter_type = {
@@ -159,8 +159,11 @@ class CompressedTensorsW8A8Fp8(CompressedTensorsScheme):
             weight, weight_scale, input_scale = process_fp8_weight_channel_strategy(
                 layer.weight, layer.weight_scale, getattr(layer, "input_scale", None)
             )
-            weight = weight.t()
-
+            if envs.VLLM_W8A8_BACKEND == 3:
+                weight = weight.t().contiguous()
+            # triton不用转置，torch需要
+            # else:
+            #     weight = weight.t()
         elif self.strategy == QuantizationStrategy.BLOCK:
             assert self.is_static_input_scheme is False
             weight, weight_scale = process_fp8_weight_block_strategy(
@@ -193,6 +196,8 @@ class CompressedTensorsW8A8Fp8(CompressedTensorsScheme):
         layer: torch.nn.Module,
         x: torch.Tensor,
         bias: torch.Tensor | None = None,
+        input_quant_args: Optional[list[torch.Tensor]] = None,
+        silu_quant_args: Optional[list[torch.Tensor]] = None, **_,
     ) -> torch.Tensor:
         if self.weight_block_size is not None:
             return self.w8a8_block_fp8_linear.apply(

vllm/model_executor/layers/quantization/fp8.py

@@ -6,7 +6,6 @@ from typing import TYPE_CHECKING, Any, Optional
 import torch
 from torch.nn import Module
 from torch.utils._python_dispatch import TorchDispatchMode
-
 import vllm.envs as envs
 import vllm.model_executor.layers.fused_moe.modular_kernel as mk
 from vllm import _custom_ops as ops
@@ -1027,20 +1026,27 @@ class Fp8MoEMethod(FusedMoEMethodBase):
         x: torch.Tensor,
         topk_weights: torch.Tensor,
         topk_ids: torch.Tensor,
+        use_nn_moe: bool | None = False,
+        use_fused_gate: bool | None = False,
     ) -> torch.Tensor | tuple[torch.Tensor, torch.Tensor]:
         assert self.kernel is not None
         assert not self.is_monolithic
-        return self.kernel(
-            x,
-            layer.w13_weight,
-            layer.w2_weight,
-            topk_weights,
-            topk_ids,
-            inplace=self.use_inplace,
+        from vllm.model_executor.layers.fused_moe import fused_experts
+
+        return fused_experts(
+            hidden_states=x,
+            w1=layer.w13_weight,
+            w2=layer.w2_weight,
+            topk_weights=topk_weights,
+            topk_ids=topk_ids,
+            inplace=True,
             activation=layer.activation,
+            apply_router_weight_on_input=layer.apply_router_weight_on_input,
             global_num_experts=layer.global_num_experts,
             expert_map=layer.expert_map,
-            apply_router_weight_on_input=layer.apply_router_weight_on_input,
+            quant_config=self.moe_quant_config,
+            use_fused_gate=use_fused_gate,
+            use_nn_moe=False,
         )
 
 

vllm/model_executor/layers/quantization/kernels/scaled_mm/pytorch.py

@@ -12,7 +12,12 @@ from .ScaledMMLinearKernel import (
     FP8ScaledMMLinearKernel,
     FP8ScaledMMLinearLayerConfig,
 )
-
+try:
+    from lmslim.quantize.quant_ops import hipblaslt_w8a8_channelwise_gemm
+    from lmslim.layers.gemm.fp8_utils import triton_scaled_mm_fp8
+except ImportError:
+    print("INFO: Please updata lmslim if you want to use fp8_utils.\n")
+from vllm import envs
 
 class TorchFP8ScaledMMLinearKernel(FP8ScaledMMLinearKernel):
     """
@@ -176,46 +181,31 @@ class ChannelWiseTorchFP8ScaledMMLinearKernel(TorchFP8ScaledMMLinearKernel):
         bias: torch.Tensor | None,
         output_shape: list,
     ) -> torch.Tensor:
-        # Use unfused DQ due to limitations with scaled_mm
-
-        # Symmetric quantized GEMM by definition computes the following:
-        #   C = (s_x * X) (s_w * W) + bias
-        # This is equivalent to dequantizing the weights and activations
-        # before applying a GEMM.
-        #
-        # In order to compute quantized operands, a quantized kernel
-        # will rewrite the above like so:
-        #   C = s_w * s_x * (X * W) + bias
-        #
-        # For the scaled_mm fallback case, we break this down, since it
-        # does not support s_w being a vector.
-
-        # Input scaling factors are no longer optional in _scaled_mm starting
-        # from pytorch 2.5. Allocating a dummy tensor to pass as scales
-        dummy_tensor = torch.ones(1, dtype=torch.float32, device=A.device)
-
-        # GEMM
-        # This computes C = (X * W).
-        # Output in fp32 to allow subsequent ops to happen in-place
-        output = torch._scaled_mm(
-            A,
-            B,
-            scale_a=dummy_tensor,
-            scale_b=dummy_tensor,
-            out_dtype=torch.float32,
-        )
-        # A fix for discrepancy in scaled_mm which returns tuple
-        # for torch < 2.5 and a single value in torch >= 2.5
-        if type(output) is tuple and len(output) == 2:
-            output = output[0]
-
-        # Unpad (undo num_token_padding)
-        output = torch.narrow(output, 0, 0, output_shape[0])
-        x_scale = torch.narrow(As, 0, 0, output_shape[0])
-
-        # DQ
-        # C = sw * sx * (X * W) + bias
-        output = output * x_scale * Bs.t()
-        if bias is not None:
-            output = output + bias
-        return output.to(out_dtype).view(*output_shape)
+        m = A.shape[0]
+        k = A.shape[1]
+        n = B.shape[0]
+
+        if envs.VLLM_W8A8_BACKEND == 3:
+            _, output = hipblaslt_w8a8_channelwise_gemm(
+                a=A,
+                b=B,
+                scale_a=As,
+                scale_b=Bs,
+                m=m,
+                n=n,
+                k=k,
+                transpose_flag="NT",
+                out_dtype=out_dtype,
+                bias=bias,
+            )
+            return output.view(m, n)
+        else:
+            output = triton_scaled_mm_fp8(
+                A,
+                B,
+                scale_a=As,
+                scale_b=Bs,
+                out_dtype=out_dtype,
+                bias=bias,
+            )
+            return output.view(*output_shape)