Optimize alltoall for 64 GPUs and above for gfx942 (#1828)

Add pxn and p2p net chunksize mi300x tuning

[ROCm/rccl commit: 4ce3df8d3a]

projects/rccl/src/include/rccl_common.h

@@ -41,6 +41,11 @@ typedef enum RcclTunableColls {
 #define RCCL_PROTOCOL_FACTOR_IDX 2
 #define RCCL_PROTOCOL_THREAD_THRESHOLD_IDX 3
 
+typedef enum {
+  RCCL_VALUE_UNSET = -2,
+  RCCL_VALUE_INVALID = -1
+} rcclValueState_t;
+
 #ifdef RCCL_EXPOSE_STATIC
 #define RCCL_STATIC_EXPOSE_CHECK()
 #else
@@ -78,7 +83,8 @@ void rcclUpdateThreadThreshold(struct ncclComm* comm, size_t const& nBytes, stru
 ncclResult_t rcclGetAlgoInfo(struct ncclComm* comm, ncclFunc_t coll, uint64_t count, ncclDataType_t dataType,
                              int collNetSupport, int nvlsSupport, int numPipeOps,
                              int* algo, int* protocol, int* maxChannels);
-
+void rcclSetPxn(struct ncclComm* comm,  int& rcclPxnDisable);
+void rcclSetP2pNetChunkSize(struct ncclComm* comm,  int& rcclP2pNetChunkSize);
 ncclResult_t rcclFuncMaxSendRecvCount(ncclFunc_t func, int nRanks, size_t count, size_t& maxCount);
 ncclResult_t commSetUnrollFactor(struct ncclComm* comm);
 #endif