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/include/collectives.h

@@ -45,4 +45,15 @@ inline int ncclTypeSize(ncclDataType_t type) {
   }
 }
 
+#include <sys/types.h>
+
+#define NCCL_MODE_NORMAL 0
+#define NCCL_MODE_OFFSET 1
+#define NCCL_MODE_PTR    2
+struct ncclConnFifo {
+  int mode;
+  int offset;
+  ssize_t size;
+  void* ptr;
+};
 #endif