2.20.3-1

Add support for alternating rings, allow for cross-nic rings without
cross-rail communication.
Add support for user buffer registration for network send/recv.
Optimize aggregated operations to better utilize all channels.
Add flattening for BCM PCI gen5 switches.
Add support for inter-node NVLink communication
Add support for port fusion in NET/IB.
Add support for ReduceScatter and AllGather using Collnet.
Update net API to v8.
Fix hang during A2A connection.

src/misc/utils.cc

@@ -291,3 +291,79 @@ void ncclMemoryStackDestruct(struct ncclMemoryStack* me) {
     h = h1;
   }
 }
+
+const char* ncclOpToString(ncclRedOp_t op) {
+  switch (op) {
+    case ncclSum:
+      return "ncclSum";
+    case ncclProd:
+      return "ncclProd";
+    case ncclMax:
+      return "ncclMax";
+    case ncclMin:
+      return "ncclMin";
+    case ncclAvg:
+      return "ncclAvg";
+    default:
+      return "Unknown";
+  }
+}
+
+const char* ncclDatatypeToString(ncclDataType_t type) {
+  switch (type) {
+    case ncclInt8: // ncclChar
+      return "ncclInt8";
+    case ncclInt32: // ncclInt
+      return "ncclInt32";
+    case ncclUint32:
+      return "ncclUint32";
+    case ncclInt64:
+      return "ncclInt64";
+    case ncclUint64:
+      return "ncclUint64";
+    case ncclFloat16: // ncclHalf
+      return "ncclFloat16";
+    case ncclFloat32: // ncclFloat
+      return "ncclFloat32";
+    case ncclFloat64: // ncclDouble
+      return "ncclFloat64";
+#if defined(__CUDA_BF16_TYPES_EXIST__)
+    case ncclBfloat16:
+      return "ncclBfloat16";
+#endif
+    default:
+      return "Unknown";
+  }
+}
+
+const char* ncclAlgoToString(int algo) {
+  switch (algo) {
+    case NCCL_ALGO_TREE:
+      return "TREE";
+    case NCCL_ALGO_RING:
+      return "RING";
+    case NCCL_ALGO_COLLNET_DIRECT:
+      return "COLLNET_DIRECT";
+    case NCCL_ALGO_COLLNET_CHAIN:
+      return "COLLNET_CHAIN";
+    case NCCL_ALGO_NVLS:
+      return "NVLS";
+    case NCCL_ALGO_NVLS_TREE:
+      return "NVLS_TREE";
+    default:
+      return "Unknown";
+  }
+}
+
+const char* ncclProtoToString(int proto) {
+  switch (proto) {
+    case NCCL_PROTO_LL:
+      return "LL";
+    case NCCL_PROTO_LL128:
+      return "LL128";
+    case NCCL_PROTO_SIMPLE:
+      return "SIMPLE";
+    default:
+      return "Unknown";
+  }
+}