[compile] Allow strings in custom ops without regressing compilation times (#38123)

Signed-off-by: Richard Zou <zou3519@gmail.com>

tests/compile/passes/test_rope_kvcache_fusion.py

@@ -28,6 +28,7 @@ from vllm.forward_context import get_forward_context, set_forward_context
 from vllm.model_executor.layers.attention import Attention
 from vllm.model_executor.layers.rotary_embedding import RotaryEmbedding
 from vllm.platforms import current_platform
+from vllm.utils.torch_utils import _encode_layer_name
 from vllm.v1.attention.backend import (
     AttentionBackend,
     CommonAttentionMetadata,
@@ -170,7 +171,7 @@ class QKRoPEKVCacheTestModel(torch.nn.Module):
         k = k.view(-1, self.num_kv_heads, self.head_size)
         v = v.view(-1, self.num_kv_heads, self.head_size)
         kv_cache_dummy_dep = torch.ops.vllm.unified_kv_cache_update(
-            k, v, self.layer_name
+            k, v, _encode_layer_name(self.layer_name)
         )
         return q, k, v, kv_cache_dummy_dep
 

vllm/compilation/passes/fusion/attn_quant_fusion.py

@@ -17,6 +17,7 @@ from vllm.model_executor.layers.quantization.utils.quant_utils import (
 )
 from vllm.platforms import current_platform
 from vllm.utils.math_utils import round_up
+from vllm.utils.torch_utils import _USE_LAYERNAME, _encode_layer_name
 
 from ..vllm_inductor_pass import VllmFusionPatternMatcherPass, VllmPatternReplacement
 from .matcher_utils import MatcherQuantFP8
@@ -53,21 +54,43 @@ class AttnFp8StaticQuantPattern(VllmPatternReplacement[..., torch.Tensor]):
 
     @property
     def pattern(self) -> Callable[..., torch.Tensor]:
-        def _pattern(
-            q: torch.Tensor,
-            k: torch.Tensor,
-            v: torch.Tensor,
-            output_attn: torch.Tensor,
-            scale: torch.Tensor,
-            kv_cache_dummy_dep: torch.Tensor,
-        ) -> torch.Tensor:
+        # When _USE_LAYERNAME is enabled (torch >= 2.11), layer_name is
+        # passed as an explicit pattern input so the pattern matcher
+        # treats it as a wildcard matching hoisted LayerName placeholders.
+        # Otherwise it stays as a closure constant (original behavior).
+        _ln = _encode_layer_name(self._layer_name)
+
+        if _USE_LAYERNAME:
+
+            def _pattern_with_ln(  # type: ignore[misc]
+                q, k, v, output_attn, scale, kv_cache_dummy_dep, layer_name
+            ):
+                at1 = auto_functionalized(
+                    ATTN_OP,
+                    query=q,
+                    key=k,
+                    value=v,
+                    output=output_attn,
+                    layer_name=layer_name,
+                    output_scale=None,
+                    output_block_scale=None,
+                    kv_cache_dummy_dep=kv_cache_dummy_dep,
+                )
+                attn_out_view = RESHAPE_OP(
+                    at1[1], [q.shape[0], self._num_heads * self._head_size]
+                )
+                return self._quant_matcher(attn_out_view, scale)[0]
+
+            return _pattern_with_ln
+
+        def _pattern(q, k, v, output_attn, scale, kv_cache_dummy_dep):
             at1 = auto_functionalized(
                 ATTN_OP,
                 query=q,
                 key=k,
                 value=v,
                 output=output_attn,
-                layer_name=self._layer_name,
+                layer_name=_ln,
                 output_scale=None,
                 output_block_scale=None,
                 kv_cache_dummy_dep=kv_cache_dummy_dep,
@@ -81,14 +104,34 @@ class AttnFp8StaticQuantPattern(VllmPatternReplacement[..., torch.Tensor]):
 
     @property
     def replacement(self) -> Callable[..., torch.Tensor]:
-        def _replacement(
-            q: torch.Tensor,
-            k: torch.Tensor,
-            v: torch.Tensor,
-            output_attn: torch.Tensor,
-            scale: torch.Tensor,
-            kv_cache_dummy_dep: torch.Tensor,
-        ) -> torch.Tensor:
+        _ln = _encode_layer_name(self._layer_name)
+
+        if _USE_LAYERNAME:
+
+            def _replacement_with_ln(  # type: ignore[misc]
+                q, k, v, output_attn, scale, kv_cache_dummy_dep, layer_name
+            ):
+                output_attn = torch.empty(
+                    [q.shape[0], self._num_heads, self._head_size],
+                    dtype=FP8_DTYPE,
+                    device=q.device,
+                )
+                at1 = auto_functionalized(
+                    ATTN_OP,
+                    query=q,
+                    key=k,
+                    value=v,
+                    output=output_attn,
+                    layer_name=layer_name,
+                    output_scale=scale,
+                    output_block_scale=None,
+                    kv_cache_dummy_dep=kv_cache_dummy_dep,
+                )
+                return RESHAPE_OP(at1[1], [-1, self._num_heads * self._head_size])
+
+            return _replacement_with_ln
+
+        def _replacement(q, k, v, output_attn, scale, kv_cache_dummy_dep):
             output_attn = torch.empty(
                 [q.shape[0], self._num_heads, self._head_size],
                 dtype=FP8_DTYPE,
@@ -100,7 +143,7 @@ class AttnFp8StaticQuantPattern(VllmPatternReplacement[..., torch.Tensor]):
                 key=k,
                 value=v,
                 output=output_attn,
-                layer_name=self._layer_name,
+                layer_name=_ln,
                 output_scale=scale,
                 output_block_scale=None,
                 kv_cache_dummy_dep=kv_cache_dummy_dep,
@@ -113,7 +156,7 @@ class AttnFp8StaticQuantPattern(VllmPatternReplacement[..., torch.Tensor]):
         dtype = self._dtype
         num_heads = self._num_heads
         head_size = self._head_size
-        return [
+        inputs: list = [
             self.empty(5, num_heads, head_size, dtype=dtype),  # q
             self.empty(5, num_heads, head_size, dtype=dtype),  # k
             self.empty(5, num_heads, head_size, dtype=dtype),  # v
@@ -121,6 +164,9 @@ class AttnFp8StaticQuantPattern(VllmPatternReplacement[..., torch.Tensor]):
             self.empty_fp32(1, 1),  # scale
             self.empty(0, dtype=dtype),  # kv_cache_dummy_dep
         ]
+        if _USE_LAYERNAME:
+            inputs.append(_encode_layer_name(self._layer_name))
+        return inputs
 
 
 class AttnNvfp4QuantPattern(
@@ -144,23 +190,64 @@ class AttnNvfp4QuantPattern(
 
     @property
     def pattern(self) -> Callable[..., tuple[torch.Tensor, torch.Tensor]]:
+        _ln = _encode_layer_name(self._layer_name)
+
+        if _USE_LAYERNAME:
+
+            def _pattern_with_ln(  # type: ignore[misc]
+                q,
+                k,
+                v,
+                output_attn,
+                output_quant,
+                output_scale,
+                input_scale,
+                kv_cache_dummy_dep,
+                layer_name,
+            ):
+                at1 = auto_functionalized(
+                    ATTN_OP,
+                    query=q,
+                    key=k,
+                    value=v,
+                    output=output_attn,
+                    layer_name=layer_name,
+                    output_scale=None,
+                    output_block_scale=None,
+                    kv_cache_dummy_dep=kv_cache_dummy_dep,
+                )
+                attn_out_view = RESHAPE_OP(
+                    at1[1], [q.shape[0], self._num_heads * self._head_size]
+                )
+                at2 = auto_functionalized(
+                    self._QUANT_OP,
+                    input=attn_out_view,
+                    input_scale=input_scale,
+                    is_sf_swizzled_layout=True,
+                    output=output_quant,
+                    output_scale=output_scale,
+                )
+                return at2[1], torch.ops.aten.view.dtype(at2[2], FP8_DTYPE)
+
+            return _pattern_with_ln
+
         def _pattern(
-            q: torch.Tensor,
-            k: torch.Tensor,
-            v: torch.Tensor,
-            output_attn: torch.Tensor,
-            output_quant: torch.Tensor,
-            output_scale: torch.Tensor,
-            input_scale: torch.Tensor,
-            kv_cache_dummy_dep: torch.Tensor,
-        ) -> tuple[torch.Tensor, torch.Tensor]:
+            q,
+            k,
+            v,
+            output_attn,
+            output_quant,
+            output_scale,
+            input_scale,
+            kv_cache_dummy_dep,
+        ):
             at1 = auto_functionalized(
                 ATTN_OP,
                 query=q,
                 key=k,
                 value=v,
                 output=output_attn,
-                layer_name=self._layer_name,
+                layer_name=_ln,
                 output_scale=None,
                 output_block_scale=None,
                 kv_cache_dummy_dep=kv_cache_dummy_dep,
@@ -176,42 +263,80 @@ class AttnNvfp4QuantPattern(
                 output=output_quant,
                 output_scale=output_scale,
             )
-            output_scale_view = torch.ops.aten.view.dtype(at2[2], FP8_DTYPE)
-            return at2[1], output_scale_view
+            return at2[1], torch.ops.aten.view.dtype(at2[2], FP8_DTYPE)
 
         return _pattern
 
     @property
     def replacement(self) -> Callable[..., tuple[torch.Tensor, torch.Tensor]]:
+        _ln = _encode_layer_name(self._layer_name)
+
+        if _USE_LAYERNAME:
+
+            def _replacement_with_ln(  # type: ignore[misc]
+                q,
+                k,
+                v,
+                output_attn,
+                _output_quant,
+                output_scale,
+                input_scale,
+                kv_cache_dummy_dep,
+                layer_name,
+            ):
+                output_attn = torch.empty(
+                    [q.shape[0], self._num_heads, self._head_size // 2],
+                    dtype=FP4_DTYPE,
+                    device=q.device,
+                )
+                osv = torch.ops.aten.view.dtype(output_scale, FP8_DTYPE)
+                at2 = auto_functionalized(
+                    ATTN_OP,
+                    query=q,
+                    key=k,
+                    value=v,
+                    output=output_attn,
+                    layer_name=layer_name,
+                    output_scale=input_scale,
+                    output_block_scale=osv,
+                    kv_cache_dummy_dep=kv_cache_dummy_dep,
+                )
+                return RESHAPE_OP(
+                    at2[1], [-1, self._num_heads * self._head_size // 2]
+                ), at2[2]
+
+            return _replacement_with_ln
+
         def _replacement(
-            q: torch.Tensor,
-            k: torch.Tensor,
-            v: torch.Tensor,
-            output_attn: torch.Tensor,
-            _output_quant: torch.Tensor,
-            output_scale: torch.Tensor,
-            input_scale: torch.Tensor,
-            kv_cache_dummy_dep: torch.Tensor,
-        ) -> tuple[torch.Tensor, torch.Tensor]:
+            q,
+            k,
+            v,
+            output_attn,
+            _output_quant,
+            output_scale,
+            input_scale,
+            kv_cache_dummy_dep,
+        ):
             output_attn = torch.empty(
                 [q.shape[0], self._num_heads, self._head_size // 2],
                 dtype=FP4_DTYPE,
                 device=q.device,
             )
-            output_scale_view = torch.ops.aten.view.dtype(output_scale, FP8_DTYPE)
+            osv = torch.ops.aten.view.dtype(output_scale, FP8_DTYPE)
             at2 = auto_functionalized(
                 ATTN_OP,
                 query=q,
                 key=k,
                 value=v,
                 output=output_attn,
-                layer_name=self._layer_name,
+                layer_name=_ln,
                 output_scale=input_scale,
-                output_block_scale=output_scale_view,
+                output_block_scale=osv,
                 kv_cache_dummy_dep=kv_cache_dummy_dep,
             )
-            output = RESHAPE_OP(at2[1], [-1, self._num_heads * self._head_size // 2])
-            return output, at2[2]
+            return RESHAPE_OP(
+                at2[1], [-1, self._num_heads * self._head_size // 2]
+            ), at2[2]
 
         return _replacement
 
@@ -219,18 +344,19 @@ class AttnNvfp4QuantPattern(
         dtype = self._dtype
         num_heads = self._num_heads
         head_size = self._head_size
-        return [
+        inputs: list = [
             self.empty_bf16(5, num_heads, head_size),  # q
             self.empty_bf16(5, num_heads, head_size),  # k
             self.empty_bf16(5, num_heads, head_size),  # v
             self.empty_bf16(5, num_heads, head_size),  # output_attn
-            self.empty(5, num_heads * head_size // 2, dtype=FP4_DTYPE),  # output_quant
-            self.empty_i32(
-                128, round_up(num_heads * head_size // 16, 4)
-            ),  # output_scale
+            self.empty(5, num_heads * head_size // 2, dtype=FP4_DTYPE),
+            self.empty_i32(128, round_up(num_heads * head_size // 16, 4)),
             self.empty_fp32(1, 1),  # input_scale
             self.empty(0, dtype=dtype),  # kv_cache_dummy_dep
         ]
+        if _USE_LAYERNAME:
+            inputs.append(_encode_layer_name(self._layer_name))
+        return inputs
 
 
 class AttnQuantFusionPass(VllmFusionPatternMatcherPass):
@@ -259,13 +385,19 @@ class AttnQuantFusionPass(VllmFusionPatternMatcherPass):
                 "so no fusion patterns were registered."
             )
 
+        # When _USE_LAYERNAME is enabled, layer_name is a wildcard so all
+        # layers produce the same pattern — register once then break.
         for layer in layers:
             if layer.impl.fused_output_quant_supported(_FP8_QUANT_KEY):
                 self.register(AttnFp8StaticQuantPattern(layer, dtype))
+                if _USE_LAYERNAME:
+                    break
 
         if current_platform.is_cuda() and hasattr(torch.ops._C, "scaled_fp4_quant"):
             for layer in layers:
                 if layer.impl.fused_output_quant_supported(kNvfp4Dynamic):
                     self.register(AttnNvfp4QuantPattern(layer, dtype))
+                    if _USE_LAYERNAME:
+                        break
 
         self.dump_patterns(config, self.pm_pass)

vllm/compilation/passes/fusion/mla_attn_quant_fusion.py

@@ -15,6 +15,7 @@ from vllm.model_executor.layers.quantization.utils.quant_utils import (
     kNvfp4Dynamic,
 )
 from vllm.platforms import current_platform
+from vllm.utils.torch_utils import _USE_LAYERNAME, _encode_layer_name
 
 from ..vllm_inductor_pass import VllmFusionPatternMatcherPass, VllmPatternReplacement
 from .matcher_utils import MatcherQuantFP8
@@ -49,21 +50,43 @@ class MLAAttnFp8StaticQuantPattern(VllmPatternReplacement[..., torch.Tensor]):
 
     @property
     def pattern(self) -> Callable[..., torch.Tensor]:
-        def _pattern(
-            q: torch.Tensor,
-            kv_c_normed: torch.Tensor,
-            k_pe: torch.Tensor,
-            output_attn: torch.Tensor,
-            scale: torch.Tensor,
-            kv_cache_dummy_dep: torch.Tensor,
-        ) -> torch.Tensor:
+        _ln = _encode_layer_name(self._layer_name)
+
+        if _USE_LAYERNAME:
+
+            def _pattern_with_ln(  # type: ignore[misc]
+                q,
+                kv_c_normed,
+                k_pe,
+                output_attn,
+                scale,
+                kv_cache_dummy_dep,
+                layer_name,
+            ):
+                at1 = auto_functionalized(
+                    MLA_ATTN_OP,
+                    q=q,
+                    kv_c_normed=kv_c_normed,
+                    k_pe=k_pe,
+                    output=output_attn,
+                    layer_name=layer_name,
+                    output_scale=None,
+                    output_block_scale=None,
+                    kv_cache_dummy_dep=kv_cache_dummy_dep,
+                )
+                # MLA output is already 2D (T, N*V), no reshape needed
+                return self._quant_matcher(at1[1], scale)[0]
+
+            return _pattern_with_ln
+
+        def _pattern(q, kv_c_normed, k_pe, output_attn, scale, kv_cache_dummy_dep):
             at1 = auto_functionalized(
                 MLA_ATTN_OP,
                 q=q,
                 kv_c_normed=kv_c_normed,
                 k_pe=k_pe,
                 output=output_attn,
-                layer_name=self._layer_name,
+                layer_name=_ln,
                 output_scale=None,
                 output_block_scale=None,
                 kv_cache_dummy_dep=kv_cache_dummy_dep,
@@ -75,14 +98,41 @@ class MLAAttnFp8StaticQuantPattern(VllmPatternReplacement[..., torch.Tensor]):
 
     @property
     def replacement(self) -> Callable[..., torch.Tensor]:
-        def _replacement(
-            q: torch.Tensor,
-            kv_c_normed: torch.Tensor,
-            k_pe: torch.Tensor,
-            output_attn: torch.Tensor,
-            scale: torch.Tensor,
-            kv_cache_dummy_dep: torch.Tensor,
-        ) -> torch.Tensor:
+        _ln = _encode_layer_name(self._layer_name)
+
+        if _USE_LAYERNAME:
+
+            def _replacement_with_ln(  # type: ignore[misc]
+                q,
+                kv_c_normed,
+                k_pe,
+                output_attn,
+                scale,
+                kv_cache_dummy_dep,
+                layer_name,
+            ):
+                # MLA output in quant_dtype
+                output_attn = torch.empty(
+                    [q.shape[0], self._output_dim],
+                    dtype=FP8_DTYPE,
+                    device=q.device,
+                )
+                at1 = auto_functionalized(
+                    MLA_ATTN_OP,
+                    q=q,
+                    kv_c_normed=kv_c_normed,
+                    k_pe=k_pe,
+                    output=output_attn,
+                    layer_name=layer_name,
+                    output_scale=scale,
+                    output_block_scale=None,
+                    kv_cache_dummy_dep=kv_cache_dummy_dep,
+                )
+                return at1[1]
+
+            return _replacement_with_ln
+
+        def _replacement(q, kv_c_normed, k_pe, output_attn, scale, kv_cache_dummy_dep):
             # MLA output in quant_dtype
             output_attn = torch.empty(
                 [q.shape[0], self._output_dim],
@@ -95,7 +145,7 @@ class MLAAttnFp8StaticQuantPattern(VllmPatternReplacement[..., torch.Tensor]):
                 kv_c_normed=kv_c_normed,
                 k_pe=k_pe,
                 output=output_attn,
-                layer_name=self._layer_name,
+                layer_name=_ln,
                 output_scale=scale,
                 output_block_scale=None,
                 kv_cache_dummy_dep=kv_cache_dummy_dep,
@@ -105,7 +155,7 @@ class MLAAttnFp8StaticQuantPattern(VllmPatternReplacement[..., torch.Tensor]):
         return _replacement
 
     def get_inputs(self) -> list[torch.Tensor]:
-        return [
+        inputs: list = [
             self.empty(5, self._num_heads, self._qk_head_dim, dtype=self._dtype),
             self.empty(5, self._kv_lora_rank, dtype=self._dtype),
             self.empty(5, 1, self._qk_rope_head_dim, dtype=self._dtype),
@@ -113,6 +163,9 @@ class MLAAttnFp8StaticQuantPattern(VllmPatternReplacement[..., torch.Tensor]):
             self.empty_fp32(1, 1),
             self.empty(0, dtype=self._dtype),
         ]
+        if _USE_LAYERNAME:
+            inputs.append(_encode_layer_name(self._layer_name))
+        return inputs
 
 
 class MLAAttnNvfp4QuantPattern(
@@ -141,21 +194,56 @@ class MLAAttnNvfp4QuantPattern(
     def pattern(
         self,
     ) -> Callable[..., tuple[torch.Tensor, torch.Tensor]]:
+        _ln = _encode_layer_name(self._layer_name)
+
+        if _USE_LAYERNAME:
+
+            def _pattern_with_ln(  # type: ignore[misc]
+                q,
+                kv_c_normed,
+                k_pe,
+                output_attn,
+                input_scale,
+                kv_cache_dummy_dep,
+                layer_name,
+            ):
+                at1 = auto_functionalized(
+                    MLA_ATTN_OP,
+                    q=q,
+                    kv_c_normed=kv_c_normed,
+                    k_pe=k_pe,
+                    output=output_attn,
+                    layer_name=layer_name,
+                    output_scale=None,
+                    output_block_scale=None,
+                    kv_cache_dummy_dep=kv_cache_dummy_dep,
+                )
+                output_quant, output_scale = create_fp4_output_tensors(
+                    at1[1].shape[0], at1[1].shape[1], at1[1].device, True
+                )
+                at2 = auto_functionalized(
+                    self._QUANT_OP,
+                    input=at1[1],
+                    input_scale=input_scale,
+                    is_sf_swizzled_layout=True,
+                    output=output_quant,
+                    output_scale=output_scale,
+                )
+                output_scale_view = torch.ops.aten.view.dtype(at2[2], FP8_DTYPE)
+                return at2[1], output_scale_view
+
+            return _pattern_with_ln
+
         def _pattern(
-            q: torch.Tensor,
-            kv_c_normed: torch.Tensor,
-            k_pe: torch.Tensor,
-            output_attn: torch.Tensor,
-            input_scale: torch.Tensor,
-            kv_cache_dummy_dep: torch.Tensor,
-        ) -> tuple[torch.Tensor, torch.Tensor]:
+            q, kv_c_normed, k_pe, output_attn, input_scale, kv_cache_dummy_dep
+        ):
             at1 = auto_functionalized(
                 MLA_ATTN_OP,
                 q=q,
                 kv_c_normed=kv_c_normed,
                 k_pe=k_pe,
                 output=output_attn,
-                layer_name=self._layer_name,
+                layer_name=_ln,
                 output_scale=None,
                 output_block_scale=None,
                 kv_cache_dummy_dep=kv_cache_dummy_dep,
@@ -182,14 +270,47 @@ class MLAAttnNvfp4QuantPattern(
     def replacement(
         self,
     ) -> Callable[..., tuple[torch.Tensor, torch.Tensor]]:
+        _ln = _encode_layer_name(self._layer_name)
+
+        if _USE_LAYERNAME:
+
+            def _replacement_with_ln(  # type: ignore[misc]
+                q,
+                kv_c_normed,
+                k_pe,
+                output_attn,
+                input_scale,
+                kv_cache_dummy_dep,
+                layer_name,
+            ):
+                # MLA output in quant_dtype (FP4 packed as uint8)
+                output_attn = torch.empty(
+                    [q.shape[0], self._output_dim // 2],
+                    dtype=FP4_DTYPE,
+                    device=q.device,
+                )
+                output_scale = create_fp4_output_tensors(
+                    q.shape[0], self._output_dim, q.device, True
+                )[1]
+                output_scale_view = torch.ops.aten.view.dtype(output_scale, FP8_DTYPE)
+                at2 = auto_functionalized(
+                    MLA_ATTN_OP,
+                    q=q,
+                    kv_c_normed=kv_c_normed,
+                    k_pe=k_pe,
+                    output=output_attn,
+                    layer_name=layer_name,
+                    output_scale=input_scale,
+                    output_block_scale=output_scale_view,
+                    kv_cache_dummy_dep=kv_cache_dummy_dep,
+                )
+                return at2[1], at2[2]
+
+            return _replacement_with_ln
+
         def _replacement(
-            q: torch.Tensor,
-            kv_c_normed: torch.Tensor,
-            k_pe: torch.Tensor,
-            output_attn: torch.Tensor,
-            input_scale: torch.Tensor,
-            kv_cache_dummy_dep: torch.Tensor,
-        ) -> tuple[torch.Tensor, torch.Tensor]:
+            q, kv_c_normed, k_pe, output_attn, input_scale, kv_cache_dummy_dep
+        ):
             # MLA output in quant_dtype (FP4 packed as uint8)
             output_attn = torch.empty(
                 [q.shape[0], self._output_dim // 2],
@@ -207,7 +328,7 @@ class MLAAttnNvfp4QuantPattern(
                 kv_c_normed=kv_c_normed,
                 k_pe=k_pe,
                 output=output_attn,
-                layer_name=self._layer_name,
+                layer_name=_ln,
                 output_scale=input_scale,
                 output_block_scale=output_scale_view,
                 kv_cache_dummy_dep=kv_cache_dummy_dep,
@@ -217,7 +338,7 @@ class MLAAttnNvfp4QuantPattern(
         return _replacement
 
     def get_inputs(self) -> list[torch.Tensor]:
-        return [
+        inputs: list = [
             self.empty(5, self._num_heads, self._qk_head_dim, dtype=self._dtype),
             self.empty(5, self._kv_lora_rank, dtype=self._dtype),
             self.empty(5, 1, self._qk_rope_head_dim, dtype=self._dtype),
@@ -225,6 +346,9 @@ class MLAAttnNvfp4QuantPattern(
             self.empty_fp32(1, 1),
             self.empty(0, dtype=self._dtype),
         ]
+        if _USE_LAYERNAME:
+            inputs.append(_encode_layer_name(self._layer_name))
+        return inputs
 
 
 class MLAAttnQuantFusionPass(VllmFusionPatternMatcherPass):
@@ -250,13 +374,19 @@ class MLAAttnQuantFusionPass(VllmFusionPatternMatcherPass):
                 "so no fusion patterns were registered."
             )
 
+        # When _USE_LAYERNAME is enabled, layer_name is a wildcard so all
+        # layers produce the same pattern — register once then break.
         for layer in layers:
             if layer.impl.fused_output_quant_supported(kFp8StaticTensorSym):
                 self.register(MLAAttnFp8StaticQuantPattern(layer, dtype))
+                if _USE_LAYERNAME:
+                    break
 
         if current_platform.is_cuda() and hasattr(torch.ops._C, "scaled_fp4_quant"):
             for layer in layers:
                 if layer.impl.fused_output_quant_supported(kNvfp4Dynamic):
                     self.register(MLAAttnNvfp4QuantPattern(layer, dtype))
+                    if _USE_LAYERNAME:
+                        break
 
         self.dump_patterns(config, self.pm_pass)

vllm/compilation/passes/fusion/rope_kvcache_fusion.py

@@ -15,7 +15,13 @@ from vllm.model_executor.layers.attention.attention import (
     Attention,
     get_attention_context,
 )
-from vllm.utils.torch_utils import direct_register_custom_op
+from vllm.utils.torch_utils import (
+    _USE_LAYERNAME,
+    LayerNameType,
+    _encode_layer_name,
+    _resolve_layer_name,
+    direct_register_custom_op,
+)
 
 from ..inductor_pass import enable_fake_mode
 from ..vllm_inductor_pass import VllmInductorPass, VllmPatternMatcherPass
@@ -37,7 +43,7 @@ def fused_rope_and_unified_kv_cache_update_impl(
     positions: torch.Tensor,
     cos_sin_cache: torch.Tensor,
     is_neox: bool,
-    layer_name: str = "",
+    layer_name: LayerNameType,
 ) -> torch.Tensor:
     """
     This impl fetches the KV cache and slot mapping from the forward context,
@@ -46,6 +52,7 @@ def fused_rope_and_unified_kv_cache_update_impl(
     that is passed to unified_attention to signal a side effect and
     the data dependency between them to ensure torch.compile preserves ordering.
     """
+    layer_name = _resolve_layer_name(layer_name)
     _, attn_layer, kv_cache, layer_slot_mapping = get_attention_context(layer_name)
     if layer_slot_mapping is not None:
         attn_layer.impl.do_rope_and_kv_cache_update(
@@ -70,7 +77,7 @@ def fused_rope_and_unified_kv_cache_update_fake(
     positions: torch.Tensor,
     cos_sin_cache: torch.Tensor,
     is_neox: bool,
-    layer_name: str = "",
+    layer_name: LayerNameType,
 ) -> torch.Tensor:
     return torch.empty(0, device=query.device, dtype=query.dtype)
 
@@ -120,38 +127,30 @@ class RopeReshapeKVCachePattern:
             num_kv_heads=self.num_kv_heads,
         )
 
-    def get_inputs(self) -> list[torch.Tensor]:
+    def get_inputs(self) -> list:
         # Sample inputs to help pattern tracing
         T = 5
         L = 4096
         qkv = empty_bf16(T, self.q_size + self.k_size + self.v_size)
         positions = empty_i64(T)
         cos_sin_cache = empty_bf16(L, self.head_size)
-        return [
-            qkv,
-            positions,
-            cos_sin_cache,
-        ]
+        inputs: list = [qkv, positions, cos_sin_cache]
+        if _USE_LAYERNAME:
+            inputs.append(_encode_layer_name(self.layer_name))
+        return inputs
 
-    def register(self, pm_pass: PatternMatcherPass) -> None:
-        def pattern(
-            qkv: torch.Tensor,
-            positions: torch.Tensor,
-            cos_sin_cache: torch.Tensor,
-        ) -> tuple[torch.Tensor, torch.Tensor, torch.Tensor, torch.Tensor]:
+    def _mk_pattern_with_layer_name_input(self, _ln):
+        """Pattern/replacement with layer_name as an explicit input."""
+
+        def pattern(qkv, positions, cos_sin_cache, layer_name):
             q, k, v = qkv.split([self.q_size, self.k_size, self.v_size], dim=-1)
             q, k = self.rope_matcher(positions, q, k, cos_sin_cache)
             q = q.view(-1, self.num_heads, self.head_size)
             k = k.view(-1, self.num_kv_heads, self.head_size)
             v = v.view(-1, self.num_kv_heads, self.head_size_v)
-            dummy = torch.ops.vllm.unified_kv_cache_update(k, v, self.layer_name)
-            return dummy, q, k, v
-
-        def replacement(
-            qkv: torch.Tensor,
-            positions: torch.Tensor,
-            cos_sin_cache: torch.Tensor,
-        ) -> tuple[torch.Tensor, torch.Tensor, torch.Tensor, torch.Tensor]:
+            return torch.ops.vllm.unified_kv_cache_update(k, v, layer_name), q, k, v
+
+        def replacement(qkv, positions, cos_sin_cache, layer_name):
             q, k, v = qkv.split([self.q_size, self.k_size, self.v_size], dim=-1)
             q = q.view(-1, self.num_heads, self.head_size)
             k = k.view(-1, self.num_kv_heads, self.head_size)
@@ -164,10 +163,50 @@ class RopeReshapeKVCachePattern:
                 positions=positions,
                 cos_sin_cache=cos_sin_cache,
                 is_neox=self.is_neox,
-                layer_name=self.layer_name,
+                layer_name=layer_name,
             )
             return results[0], results[1], results[2], v
 
+        return pattern, replacement
+
+    def _mk_pattern_with_layer_name_closure(self, _ln):
+        """Pattern/replacement with layer_name as a closure constant."""
+
+        def pattern(qkv, positions, cos_sin_cache):
+            q, k, v = qkv.split([self.q_size, self.k_size, self.v_size], dim=-1)
+            q, k = self.rope_matcher(positions, q, k, cos_sin_cache)
+            q = q.view(-1, self.num_heads, self.head_size)
+            k = k.view(-1, self.num_kv_heads, self.head_size)
+            v = v.view(-1, self.num_kv_heads, self.head_size_v)
+            return torch.ops.vllm.unified_kv_cache_update(k, v, _ln), q, k, v
+
+        def replacement(qkv, positions, cos_sin_cache):
+            q, k, v = qkv.split([self.q_size, self.k_size, self.v_size], dim=-1)
+            q = q.view(-1, self.num_heads, self.head_size)
+            k = k.view(-1, self.num_kv_heads, self.head_size)
+            v = v.view(-1, self.num_kv_heads, self.head_size_v)
+            results = auto_functionalized(
+                self.FUSED_OP,
+                query=q,
+                key=k,
+                value=v,
+                positions=positions,
+                cos_sin_cache=cos_sin_cache,
+                is_neox=self.is_neox,
+                layer_name=_ln,
+            )
+            return results[0], results[1], results[2], v
+
+        return pattern, replacement
+
+    def register(self, pm_pass: PatternMatcherPass) -> None:
+        _ln = _encode_layer_name(self.layer_name)
+
+        if _USE_LAYERNAME:
+            pattern, replacement = self._mk_pattern_with_layer_name_input(_ln)
+        else:
+            pattern, replacement = self._mk_pattern_with_layer_name_closure(_ln)
+
         # NOTE: use view_to_reshape to unify view/reshape to simplify
         # pattern and increase matching opportunities
         def fwd_and_view_to_reshape(*args, **kwargs) -> fx.GraphModule:
@@ -176,7 +215,11 @@ class RopeReshapeKVCachePattern:
             return gm
 
         pm.register_replacement(
-            pattern, replacement, self.get_inputs(), fwd_and_view_to_reshape, pm_pass
+            pattern,
+            replacement,
+            self.get_inputs(),
+            fwd_and_view_to_reshape,
+            pm_pass,
         )
 
 
@@ -205,6 +248,8 @@ class RopeKVCacheFusionPass(VllmPatternMatcherPass):
         self.max_token_num = cc.pass_config.rope_kvcache_fusion_max_token_num
 
         attn_layers = get_layers_from_vllm_config(config, Attention)
+        # When _USE_LAYERNAME is enabled, layer_name is a wildcard so all
+        # layers produce the same pattern — register once then break.
         for _, layer in attn_layers.items():
             if layer.impl.fused_rope_kvcache_supported():
                 for is_neox in [True, False]:
@@ -212,6 +257,8 @@ class RopeKVCacheFusionPass(VllmPatternMatcherPass):
                         layer=layer,
                         is_neox=is_neox,
                     ).register(self.patterns)
+                if _USE_LAYERNAME:
+                    break
 
         self.dump_patterns(config, self.patterns)
 

vllm/envs.py

@@ -129,6 +129,7 @@ if TYPE_CHECKING:
     VLLM_ENABLE_V1_MULTIPROCESSING: bool = True
     VLLM_LOG_BATCHSIZE_INTERVAL: float = -1
     VLLM_DISABLE_COMPILE_CACHE: bool = False
+    VLLM_USE_LAYERNAME: bool = True
     Q_SCALE_CONSTANT: int = 200
     K_SCALE_CONSTANT: int = 200
     V_SCALE_CONSTANT: int = 100
@@ -1090,6 +1091,9 @@ environment_variables: dict[str, Callable[[], Any]] = {
         os.getenv("VLLM_LOG_BATCHSIZE_INTERVAL", "-1")
     ),
     "VLLM_DISABLE_COMPILE_CACHE": disable_compile_cache,
+    # If set to "0", disable LayerName opaque type for layer_name
+    # parameters in custom ops.  Defaults to enabled on torch >= 2.11.
+    "VLLM_USE_LAYERNAME": lambda: bool(int(os.getenv("VLLM_USE_LAYERNAME", "1"))),
     # If set, vllm will run in development mode, which will enable
     # some additional endpoints for developing and debugging,
     # e.g. `/reset_prefix_cache`

vllm/model_executor/layers/attention/attention.py

@@ -25,6 +25,9 @@ from vllm.model_executor.layers.quantization.kv_cache import BaseKVCacheMethod
 from vllm.model_executor.layers.quantization.utils.quant_utils import GroupShape
 from vllm.platforms import current_platform
 from vllm.utils.torch_utils import (
+    LayerNameType,
+    _encode_layer_name,
+    _resolve_layer_name,
     direct_register_custom_op,
     kv_cache_dtype_str_to_dtype,
 )
@@ -414,7 +417,9 @@ class Attention(nn.Module, AttentionLayerBase):
         `vllm.forward_context.get_forward_context().attn_metadata`.
         """
         if self.calculate_kv_scales:
-            torch.ops.vllm.maybe_calc_kv_scales(query, key, value, self.layer_name)
+            torch.ops.vllm.maybe_calc_kv_scales(
+                query, key, value, _encode_layer_name(self.layer_name)
+            )
         output_dtype = query.dtype
         if self.query_quant is not None:
             # quantizing with a simple torch operation enables
@@ -466,6 +471,7 @@ class Attention(nn.Module, AttentionLayerBase):
             )
         else:
             # Skip this if sharing KV cache with an earlier attention layer.
+            encoded = _encode_layer_name(self.layer_name)
             if (
                 not self.attn_backend.forward_includes_kv_cache_update
                 and self.kv_sharing_target_layer_name is None
@@ -473,14 +479,14 @@ class Attention(nn.Module, AttentionLayerBase):
                 and value is not None
             ):
                 kv_cache_dummy_dep = torch.ops.vllm.unified_kv_cache_update(
-                    key, value, self.layer_name
+                    key, value, encoded
                 )
             torch.ops.vllm.unified_attention_with_output(
                 query,
                 key,
                 value,
                 output,
-                self.layer_name,
+                encoded,
                 kv_cache_dummy_dep=kv_cache_dummy_dep,
             )
         return output.view(-1, hidden_size)
@@ -553,8 +559,9 @@ def maybe_calc_kv_scales(
     query: torch.Tensor,
     key: torch.Tensor,
     value: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
 ) -> None:
+    layer_name = _resolve_layer_name(layer_name)
     forward_context: ForwardContext = get_forward_context()
     self = forward_context.no_compile_layers[layer_name]
 
@@ -570,7 +577,7 @@ def maybe_calc_kv_scales_fake(
     query: torch.Tensor,
     key: torch.Tensor,
     value: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
 ) -> None:
     return
 
@@ -622,12 +629,13 @@ def get_attention_context(
 def unified_kv_cache_update(
     key: torch.Tensor,
     value: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
 ) -> torch.Tensor:
     """
     Returns a dummy that is passed to unified_attention to signal a side effect and
     the data dependency between them to ensure torch.compile preserves ordering.
     """
+    layer_name = _resolve_layer_name(layer_name)
     _, attn_layer, kv_cache, layer_slot_mapping = get_attention_context(layer_name)
     if layer_slot_mapping is not None:
         assert hasattr(attn_layer.impl, "do_kv_cache_update"), (
@@ -647,7 +655,7 @@ def unified_kv_cache_update(
 def unified_kv_cache_update_fake(
     key: torch.Tensor,
     value: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
 ) -> torch.Tensor:
     return torch.empty(0, device=key.device, dtype=key.dtype)
 
@@ -666,7 +674,7 @@ def unified_attention_with_output(
     key: torch.Tensor,
     value: torch.Tensor,
     output: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
     output_scale: torch.Tensor | None = None,
     output_block_scale: torch.Tensor | None = None,
     kv_cache_dummy_dep: torch.Tensor | None = None,
@@ -675,6 +683,7 @@ def unified_attention_with_output(
     # that ensures torch.compile preserves ordering between KV cache update and
     # attention forward.
     del kv_cache_dummy_dep
+    layer_name = _resolve_layer_name(layer_name)
     attn_metadata, self, kv_cache, _ = get_attention_context(layer_name)
 
     self.impl.forward(
@@ -695,7 +704,7 @@ def unified_attention_with_output_fake(
     key: torch.Tensor,
     value: torch.Tensor,
     output: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
     output_scale: torch.Tensor | None = None,
     output_block_scale: torch.Tensor | None = None,
     kv_cache_dummy_dep: torch.Tensor | None = None,

vllm/model_executor/layers/attention/kv_transfer_utils.py

@@ -9,6 +9,7 @@ from vllm.distributed.kv_transfer import (
     has_kv_transfer_group,
     is_v1_kv_transfer_group,
 )
+from vllm.utils.torch_utils import _resolve_layer_name
 
 
 def maybe_transfer_kv_layer(func: Callable) -> Callable:
@@ -38,7 +39,7 @@ def maybe_transfer_kv_layer(func: Callable) -> Callable:
         if not has_kv_transfer_group() or not is_v1_kv_transfer_group():
             return func(*args, **kwargs)
 
-        layer_name: str = args[layer_name_index]
+        layer_name = _resolve_layer_name(args[layer_name_index])
 
         # Extract attention context (metadata, layer, kv_cache, layer_slot_mapping)
         attn_metadata, _, kv_cache, _ = get_attention_context(layer_name)

vllm/model_executor/layers/attention/mla_attention.py

@@ -240,6 +240,9 @@ from vllm.platforms import current_platform
 from vllm.utils.flashinfer import has_flashinfer, has_nvidia_artifactory
 from vllm.utils.math_utils import cdiv, round_down
 from vllm.utils.torch_utils import (
+    LayerNameType,
+    _encode_layer_name,
+    _resolve_layer_name,
     direct_register_custom_op,
     is_quantized_kv_cache,
     kv_cache_dtype_str_to_dtype,
@@ -473,7 +476,12 @@ class MLAAttention(nn.Module, AttentionLayerBase):
         output_shape: torch.Size | None = None,
     ) -> torch.Tensor:
         if self.calculate_kv_scales:
-            torch.ops.vllm.maybe_calc_kv_scales(q, kv_c_normed, k_pe, self.layer_name)
+            torch.ops.vllm.maybe_calc_kv_scales(
+                q,
+                kv_c_normed,
+                k_pe,
+                _encode_layer_name(self.layer_name),
+            )
 
         if self.use_direct_call:
             forward_context: ForwardContext = get_forward_context()
@@ -505,10 +513,11 @@ class MLAAttention(nn.Module, AttentionLayerBase):
             )
             return output
         else:
+            encoded = _encode_layer_name(self.layer_name)
             kv_cache_dummy_dep = torch.ops.vllm.unified_mla_kv_cache_update(
                 kv_c_normed,
                 k_pe,
-                self.layer_name,
+                encoded,
                 self.kv_cache_dtype,
                 self._k_scale,
             )
@@ -518,7 +527,7 @@ class MLAAttention(nn.Module, AttentionLayerBase):
                 kv_c_normed,
                 k_pe,
                 output,
-                self.layer_name,
+                encoded,
                 kv_cache_dummy_dep=kv_cache_dummy_dep,
             )
             return output
@@ -900,7 +909,7 @@ class MLAAttention(nn.Module, AttentionLayerBase):
 def unified_mla_kv_cache_update(
     kv_c_normed: torch.Tensor,
     k_pe: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
     kv_cache_dtype: str,
     k_scale: torch.Tensor,
 ) -> torch.Tensor:
@@ -908,6 +917,7 @@ def unified_mla_kv_cache_update(
     Returns a dummy that is passed to unified_attention to signal a side effect and
     the data dependency between them to ensure torch.compile preserves ordering.
     """
+    layer_name = _resolve_layer_name(layer_name)
     forward_context = get_forward_context()
     attn_layer = forward_context.no_compile_layers[layer_name]
     kv_cache = attn_layer.kv_cache
@@ -939,7 +949,7 @@ def unified_mla_kv_cache_update(
 def unified_mla_kv_cache_update_fake(
     kv_c_normed: torch.Tensor,
     k_pe: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
     kv_cache_dtype: str,
     k_scale: torch.Tensor,
 ) -> torch.Tensor:
@@ -959,7 +969,7 @@ def unified_mla_attention_with_output(
     kv_c_normed: torch.Tensor,
     k_pe: torch.Tensor,
     output: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
     output_scale: torch.Tensor | None = None,
     output_block_scale: torch.Tensor | None = None,
     kv_cache_dummy_dep: torch.Tensor | None = None,
@@ -968,6 +978,7 @@ def unified_mla_attention_with_output(
     # that ensures torch.compile preserves ordering between KV cache update and
     # attention forward.
     del kv_cache_dummy_dep
+    layer_name = _resolve_layer_name(layer_name)
     attn_metadata, layer, kv_cache, _ = get_attention_context(layer_name)
     layer.forward_impl(
         q,
@@ -986,7 +997,7 @@ def unified_mla_attention_with_output_fake(
     kv_c_normed: torch.Tensor,
     k_pe: torch.Tensor,
     output: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
     output_scale: torch.Tensor | None = None,
     output_block_scale: torch.Tensor | None = None,
     kv_cache_dummy_dep: torch.Tensor | None = None,

vllm/model_executor/layers/attention/static_sink_attention.py

@@ -10,7 +10,12 @@ from vllm.logger import init_logger
 from vllm.model_executor.custom_op import CustomOp
 from vllm.model_executor.layers.attention import Attention
 from vllm.utils.math_utils import cdiv
-from vllm.utils.torch_utils import direct_register_custom_op
+from vllm.utils.torch_utils import (
+    LayerNameType,
+    _encode_layer_name,
+    _resolve_layer_name,
+    direct_register_custom_op,
+)
 from vllm.v1.attention.backend import (
     AttentionBackend,
     AttentionMetadata,
@@ -170,7 +175,9 @@ class StaticSinkAttention(Attention, CustomOp):
         )
         if not self.sink_populated:
             self_kv_cache = self.kv_cache
-            torch.ops.vllm.maybe_populate_sink(self_kv_cache, self.layer_name)
+            torch.ops.vllm.maybe_populate_sink(
+                self_kv_cache, _encode_layer_name(self.layer_name)
+            )
 
         return super().forward(query, key, value, output_shape)
 
@@ -224,8 +231,9 @@ class StaticSinkAttention(Attention, CustomOp):
 
 def maybe_populate_sink(
     self_kv_cache: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
 ) -> None:
+    layer_name = _resolve_layer_name(layer_name)
     forward_context: ForwardContext = get_forward_context()
     self = forward_context.no_compile_layers[layer_name]
     if self.sink_populated or self_kv_cache.numel() == 0:
@@ -235,7 +243,7 @@ def maybe_populate_sink(
 
 def maybe_populate_sink_fake(
     self_kv_cache: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
 ) -> None:
     return
 

vllm/model_executor/layers/fused_moe/runner/moe_runner_base.py

@@ -32,15 +32,15 @@ from vllm.model_executor.layers.fused_moe.runner.shared_experts import (
 )
 from vllm.platforms import current_platform
 from vllm.utils.torch_utils import (
-    HAS_OPAQUE_TYPE,
-    ModuleName,
+    _USE_LAYERNAME,
+    LayerName,
     direct_register_custom_op,
 )
 
 
 def get_layer_from_name(layer_name: str) -> torch.nn.Module:
     forward_context: ForwardContext = get_forward_context()
-    if not HAS_OPAQUE_TYPE and layer_name == "from_forward_context":
+    if not _USE_LAYERNAME and layer_name == "from_forward_context":
         all_moe_layers = forward_context.all_moe_layers
         assert all_moe_layers is not None
         moe_layer_index = forward_context.moe_layer_index
@@ -55,21 +55,21 @@ def get_layer_from_name(layer_name: str) -> torch.nn.Module:
     return forward_context.no_compile_layers[layer_name]
 
 
-# On torch >= 2.11, layer_name is a hoisted ModuleName opaque object;
+# On torch >= 2.11, layer_name is a hoisted LayerName opaque object;
 # on older versions it remains a plain str.
 if TYPE_CHECKING:
     from typing import TypeAlias
 
-    _layer_name_type: TypeAlias = str | ModuleName
+    _layer_name_type: TypeAlias = str | LayerName
 else:
-    _layer_name_type = ModuleName if HAS_OPAQUE_TYPE else str
+    _layer_name_type = LayerName if _USE_LAYERNAME else str
 
 
 @torch.compiler.assume_constant_result
-def _resolve_layer_name(layer_name: str | ModuleName) -> str:
+def _resolve_layer_name(layer_name: str | LayerName) -> str:
     from torch._library.fake_class_registry import FakeScriptObject
 
-    if isinstance(layer_name, ModuleName):
+    if isinstance(layer_name, LayerName):
         return layer_name.value
     elif isinstance(layer_name, FakeScriptObject):
         return layer_name.real_obj.value
@@ -331,9 +331,9 @@ class MoERunnerBase(MoERunner):
             assert len(trunc_sizes) == 1
             return func(states, trunc_sizes[0])
 
-    def _encode_layer_name(self) -> str | ModuleName:
-        if HAS_OPAQUE_TYPE:
-            return ModuleName(self.layer_name)
+    def _encode_layer_name(self) -> str | LayerName:
+        if _USE_LAYERNAME:
+            return LayerName(self.layer_name)
         # Can be unavailable or None in unittests
         if (
             is_forward_context_available()

vllm/model_executor/layers/mamba/gdn_linear_attn.py

@@ -56,7 +56,12 @@ from vllm.model_executor.utils import set_weight_attrs
 from vllm.platforms import current_platform
 from vllm.transformers_utils.configs.qwen3_next import Qwen3NextConfig
 from vllm.triton_utils import tl, triton
-from vllm.utils.torch_utils import direct_register_custom_op
+from vllm.utils.torch_utils import (
+    LayerNameType,
+    _encode_layer_name,
+    _resolve_layer_name,
+    direct_register_custom_op,
+)
 from vllm.v1.attention.backend import AttentionMetadata
 from vllm.v1.attention.backends.gdn_attn import GDNAttentionMetadata
 
@@ -568,7 +573,7 @@ class GatedDeltaNetAttention(PluggableLayer, MambaBase):
             b,
             a,
             core_attn_out,
-            self.prefix,
+            _encode_layer_name(self.prefix),
         )
 
         # ============================================================
@@ -1084,13 +1089,14 @@ def gdn_attention_core(
     b: torch.Tensor,
     a: torch.Tensor,
     core_attn_out: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
 ) -> None:
     """
     Custom op for the core attention computation.
     Only handles the convolution + recurrent attention part.
     Input/output projections are handled outside this op.
     """
+    layer_name = _resolve_layer_name(layer_name)
     forward_context: ForwardContext = get_forward_context()
     self = forward_context.no_compile_layers[layer_name]
     self._forward_core(
@@ -1106,7 +1112,7 @@ def gdn_attention_core_fake(
     b: torch.Tensor,
     a: torch.Tensor,
     core_attn_out: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
 ) -> None:
     """Fake implementation for torch.compile."""
     return

vllm/model_executor/layers/mamba/mamba_mixer.py

@@ -36,7 +36,12 @@ from vllm.model_executor.layers.mamba.ops.mamba_ssm import (
 )
 from vllm.model_executor.utils import set_weight_attrs
 from vllm.platforms import current_platform
-from vllm.utils.torch_utils import direct_register_custom_op
+from vllm.utils.torch_utils import (
+    LayerNameType,
+    _encode_layer_name,
+    _resolve_layer_name,
+    direct_register_custom_op,
+)
 from vllm.v1.attention.backends.mamba1_attn import Mamba1AttentionMetadata
 
 
@@ -228,7 +233,7 @@ class MambaMixer(MambaBase, PluggableLayer):
         torch.ops.vllm.mamba_mixer(
             hidden_states,
             output,
-            self.prefix,
+            _encode_layer_name(self.prefix),
         )
 
     def forward_impl(self, hidden_states: torch.Tensor, output: torch.Tensor):
@@ -515,8 +520,9 @@ def split_batch_to_prefill_and_decode(
 def mamba_mixer(
     hidden_states: torch.Tensor,
     output: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
 ) -> None:
+    layer_name = _resolve_layer_name(layer_name)
     forward_context: ForwardContext = get_forward_context()
     self = forward_context.no_compile_layers[layer_name]
     self.forward_impl(hidden_states=hidden_states, output=output)
@@ -525,7 +531,7 @@ def mamba_mixer(
 def mamba_mixer_fake(
     hidden_states: torch.Tensor,
     output: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
 ) -> None:
     return
 

vllm/model_executor/layers/mamba/mamba_mixer2.py

@@ -44,7 +44,12 @@ from vllm.model_executor.model_loader.weight_utils import (
 from vllm.model_executor.parameter import BasevLLMParameter
 from vllm.model_executor.utils import set_weight_attrs
 from vllm.platforms import current_platform
-from vllm.utils.torch_utils import direct_register_custom_op
+from vllm.utils.torch_utils import (
+    LayerNameType,
+    _encode_layer_name,
+    _resolve_layer_name,
+    direct_register_custom_op,
+)
 from vllm.v1.attention.backend import AttentionMetadata
 from vllm.v1.attention.backends.mamba2_attn import Mamba2AttentionMetadata
 
@@ -536,7 +541,7 @@ class MambaMixer2(MambaBase, PluggableLayer):
         torch.ops.vllm.mamba_mixer2(
             projected_states,
             ssm_output,
-            self.prefix,
+            _encode_layer_name(self.prefix),
         )
 
         # 4. gated MLP
@@ -927,8 +932,9 @@ class MambaMixer2(MambaBase, PluggableLayer):
 def mamba_mixer2(
     projected_states: torch.Tensor,
     output: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
 ) -> None:
+    layer_name = _resolve_layer_name(layer_name)
     forward_context: ForwardContext = get_forward_context()
     self = forward_context.no_compile_layers[layer_name]
     self.conv_ssm_forward(projected_states=projected_states, output=output)
@@ -937,7 +943,7 @@ def mamba_mixer2(
 def mamba_mixer2_fake(
     projected_states: torch.Tensor,
     output: torch.Tensor,
-    layer_name: str,
+    layer_name: LayerNameType,
 ) -> None:
     return
 

vllm/model_executor/layers/sparse_attn_indexer.py

@@ -11,7 +11,12 @@ from vllm.logger import init_logger
 from vllm.model_executor.custom_op import CustomOp
 from vllm.platforms import current_platform
 from vllm.utils.deep_gemm import fp8_mqa_logits, fp8_paged_mqa_logits, has_deep_gemm
-from vllm.utils.torch_utils import direct_register_custom_op
+from vllm.utils.torch_utils import (
+    LayerNameType,
+    _encode_layer_name,
+    _resolve_layer_name,
+    direct_register_custom_op,
+)
 from vllm.v1.attention.backends.mla.indexer import (
     DeepseekV32IndexerMetadata,
 )
@@ -30,7 +35,7 @@ RADIX_TOPK_WORKSPACE_SIZE = 1024 * 1024
 
 def sparse_attn_indexer(
     hidden_states: torch.Tensor,
-    k_cache_prefix: str,
+    k_cache_prefix: LayerNameType,
     kv_cache: torch.Tensor,
     q_fp8: torch.Tensor,
     k: torch.Tensor,
@@ -46,6 +51,7 @@ def sparse_attn_indexer(
     # careful! this will be None in dummy run
     attn_metadata = get_forward_context().attn_metadata
     fp8_dtype = current_platform.fp8_dtype()
+    k_cache_prefix = _resolve_layer_name(k_cache_prefix)
 
     # assert isinstance(attn_metadata, dict)
     if not isinstance(attn_metadata, dict):
@@ -253,7 +259,7 @@ def sparse_attn_indexer(
 
 def sparse_attn_indexer_fake(
     hidden_states: torch.Tensor,
-    k_cache_prefix: str,
+    k_cache_prefix: LayerNameType,
     kv_cache: torch.Tensor,
     q_fp8: torch.Tensor,
     k: torch.Tensor,
@@ -342,7 +348,7 @@ class SparseAttnIndexer(CustomOp):
     ):
         return torch.ops.vllm.sparse_attn_indexer(
             hidden_states,
-            self.k_cache.prefix,
+            _encode_layer_name(self.k_cache.prefix),
             self.k_cache.kv_cache,
             q_fp8,
             k,
@@ -366,7 +372,7 @@ class SparseAttnIndexer(CustomOp):
         if rocm_aiter_ops.is_enabled():
             return torch.ops.vllm.rocm_aiter_sparse_attn_indexer(
                 hidden_states,
-                self.k_cache.prefix,
+                _encode_layer_name(self.k_cache.prefix),
                 self.k_cache.kv_cache,
                 q_fp8,
                 k,

vllm/utils/torch_utils.py

@@ -15,6 +15,7 @@ from packaging import version
 from packaging.version import Version
 from torch.library import Library, infer_schema
 
+import vllm.envs as envs
 from vllm.logger import init_logger
 
 if TYPE_CHECKING:
@@ -709,37 +710,62 @@ def is_torch_equal(target: str) -> bool:
 
 HAS_OPAQUE_TYPE = is_torch_equal_or_newer("2.11.0.dev")
 
+# Allow toggling LayerName usage via environment variable.
+# Defaults to True on torch >= 2.11, False otherwise.
+# Set VLLM_USE_LAYERNAME=0 to disable even on torch >= 2.11.
+_USE_LAYERNAME = HAS_OPAQUE_TYPE and envs.VLLM_USE_LAYERNAME
+
 if HAS_OPAQUE_TYPE:
     from torch._opaque_base import OpaqueBase
 else:
     OpaqueBase = object  # type: ignore[misc, assignment]
 
 
-class ModuleName(OpaqueBase):  # type: ignore[misc]
+class LayerName(OpaqueBase):  # type: ignore[misc]
     """Wraps a module name string for use as a torch opaque type.
 
     When torch >= 2.11, this is registered as a hoisted value-type opaque
     object so that torch.compile lifts it as a graph input instead of baking
-    it as a constant.  This avoids per-layer recompilation for MOE ops.
+    it as a constant.  This avoids per-layer recompilation for custom ops
+    that accept layer name strings (attention, MOE, KV cache, etc.).
     """
 
     def __init__(self, value: str):
         self.value = value
 
     def __eq__(self, other):
-        return isinstance(other, ModuleName) and self.value == other.value
+        return isinstance(other, LayerName) and self.value == other.value
 
     def __hash__(self):
         return hash(self.value)
 
     def __fx_repr__(self):
-        return (f"ModuleName({self.value!r})", {ModuleName})
+        return (f"LayerName({self.value!r})", {"LayerName": LayerName})
 
 
 if HAS_OPAQUE_TYPE:
     from torch._library.opaque_object import register_opaque_type
 
-    register_opaque_type(ModuleName, typ="value", hoist=True)
+    register_opaque_type(LayerName, typ="value", hoist=True)
+
+# On torch >= 2.11 (with VLLM_USE_LAYERNAME enabled), custom op
+# layer_name parameters use LayerName; otherwise they remain plain str.
+if TYPE_CHECKING:
+    from typing import TypeAlias
+
+    LayerNameType: TypeAlias = str | LayerName
+else:
+    LayerNameType = LayerName if _USE_LAYERNAME else str
+
+
+def _resolve_layer_name(layer_name: str | LayerName) -> str:
+    """Unwrap a LayerName to str, or return str unchanged."""
+    return layer_name.value if isinstance(layer_name, LayerName) else layer_name
+
+
+def _encode_layer_name(layer_name: str) -> str | LayerName:
+    """Wrap a str layer name as LayerName when enabled."""
+    return LayerName(layer_name) if _USE_LAYERNAME else layer_name
 
 
 # Supports xccl with PyTorch versions >= 2.8.0.dev for XPU platform

vllm/v1/attention/ops/rocm_aiter_mla_sparse.py

@@ -9,6 +9,7 @@ import torch
 from vllm.forward_context import get_forward_context
 from vllm.platforms import current_platform
 from vllm.triton_utils import tl, triton
+from vllm.utils.torch_utils import LayerNameType
 from vllm.v1.attention.backends.mla.indexer import DeepseekV32IndexerMetadata
 from vllm.v1.attention.ops.common import pack_seq_triton, unpack_seq_triton
 
@@ -459,7 +460,7 @@ def rocm_fp8_mqa_logits(
 
 def rocm_aiter_sparse_attn_indexer_fake(
     hidden_states: torch.Tensor,
-    k_cache_prefix: str,
+    k_cache_prefix: LayerNameType,
     kv_cache: torch.Tensor,
     q_fp8: torch.Tensor,
     k: torch.Tensor,
@@ -486,7 +487,7 @@ def rocm_aiter_sparse_attn_indexer_fake(
 
 def rocm_aiter_sparse_attn_indexer(
     hidden_states: torch.Tensor,
-    k_cache_prefix: str,
+    k_cache_prefix: LayerNameType,
     kv_cache: torch.Tensor,
     q_fp8: torch.Tensor,
     k: torch.Tensor,
@@ -502,6 +503,9 @@ def rocm_aiter_sparse_attn_indexer(
     # careful! this will be None in dummy run
     attn_metadata = get_forward_context().attn_metadata
     fp8_dtype = current_platform.fp8_dtype()
+    from vllm.utils.torch_utils import _resolve_layer_name
+
+    k_cache_prefix = _resolve_layer_name(k_cache_prefix)
     # assert isinstance(attn_metadata, dict)
     if not isinstance(attn_metadata, dict):
         return rocm_aiter_sparse_attn_indexer_fake(