feat: update flashinfer ar oneshot params (#8687)

python/sglang/srt/layers/communicator.py

@@ -443,7 +443,6 @@ class CommunicateWithAllReduceAndLayerNormFn:
                 and _is_flashinfer_available
                 and hasattr(layernorm, "forward_with_allreduce_fusion")
                 and global_server_args_dict["enable_flashinfer_allreduce_fusion"]
-                and hidden_states.shape[0] <= 128
             ):
                 hidden_states, residual = layernorm.forward_with_allreduce_fusion(
                     hidden_states, residual

python/sglang/srt/layers/flashinfer_comm_fusion.py

@@ -125,7 +125,7 @@ def flashinfer_allreduce_residual_rmsnorm(
     weight: torch.Tensor,
     eps: float = 1e-6,
     max_token_num: int = 128,
-    use_oneshot: bool = True,
+    use_oneshot: Optional[bool] = None,
     trigger_completion_at_end: bool = False,
     fp32_acc: bool = False,
 ) -> Tuple[torch.Tensor, torch.Tensor]: