[TRTLLM-6743][feat] Optimize and refactor alltoall in WideEP

cpp/tensorrt_llm/kernels/moeCommKernelsCommon.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2019-2025, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include <stdint.h>
+
+namespace tensorrt_llm
+{
+namespace kernels
+{
+
+#ifdef __CUDACC__
+#define ALIGN_256 __align__(256)
+#else
+#define ALIGN_256 alignas(256)
+#endif
+
+constexpr int WARP_SIZE = 32;
+constexpr uint32_t WARP_MASK = 0xffffffff;
+
+struct MoeEpWorldInfo
+{
+    int epSize;
+    int epRank;
+};
+
+struct MoeExpertParallelInfo
+{
+    int expertCount = -1;
+    int topK = 1;
+};
+
+} // namespace kernels
+} // namespace tensorrt_llm