/*************************************************************************
 * Copyright (c) 2016-2020, NVIDIA CORPORATION. All rights reserved.
 *
 * See LICENSE.txt for license information
 ************************************************************************/

#ifndef NCCL_GRAPH_H_
#define NCCL_GRAPH_H_

#include "nccl.h"
#include "devcomm.h"
#include <limits.h>
#include <stdlib.h>
#include <ctype.h>
#include <stdio.h>

ncclResult_t ncclTopoCudaPath(int cudaDev, char** path);

struct ncclTopoSystem;
// Build the topology
ncclResult_t ncclTopoGetSystem(struct ncclComm* comm, struct ncclTopoSystem** system);
ncclResult_t ncclTopoSortSystem(struct ncclTopoSystem* system);
ncclResult_t ncclTopoPrint(struct ncclTopoSystem* system);

ncclResult_t ncclTopoComputePaths(struct ncclTopoSystem* system, struct ncclPeerInfo* info);
void ncclTopoFree(struct ncclTopoSystem* system);
ncclResult_t ncclTopoTrimSystem(struct ncclTopoSystem* system, struct ncclComm* comm);
ncclResult_t ncclTopoComputeP2pChannels(struct ncclComm* comm);

// Query topology
ncclResult_t ncclTopoGetNetDev(struct ncclTopoSystem* system, int rank, struct ncclTopoGraph* graph, int channelId, int* net);
ncclResult_t ncclTopoCheckP2p(struct ncclTopoSystem* system, int64_t id1, int64_t id2, int* p2p, int *read, int* intermediateRank);
ncclResult_t ncclTopoCheckGdr(struct ncclTopoSystem* topo, int64_t busId, int netDev, int read, int* useGdr);

// Set CPU affinity
ncclResult_t ncclTopoSetAffinity(struct ncclTopoSystem* system, int rank);

#define NCCL_TOPO_CPU_ARCH_X86 1
#define NCCL_TOPO_CPU_ARCH_POWER 2
#define NCCL_TOPO_CPU_ARCH_ARM 3
#define NCCL_TOPO_CPU_VENDOR_INTEL 1
#define NCCL_TOPO_CPU_VENDOR_AMD 2
#define NCCL_TOPO_CPU_TYPE_BDW 1
#define NCCL_TOPO_CPU_TYPE_SKL 2
ncclResult_t ncclTopoCpuType(struct ncclTopoSystem* system, int* arch, int* vendor, int* model);
ncclResult_t ncclTopoGetNetCount(struct ncclTopoSystem* system, int* count);

#define NCCL_TOPO_MAX_NODES 256

// Init search. Needs to be done before calling ncclTopoCompute
ncclResult_t ncclTopoSearchInit(struct ncclTopoSystem* system);

#define NCCL_TOPO_PATTERN_BALANCED_TREE 1   // Spread NIC traffic between two GPUs (Tree parent + one child on first GPU, second child on second GPU)
#define NCCL_TOPO_PATTERN_SPLIT_TREE 2      // Spread NIC traffic between two GPUs (Tree parent on first GPU, tree children on the second GPU)
#define NCCL_TOPO_PATTERN_TREE 3            // All NIC traffic going to/from the same GPU
#define NCCL_TOPO_PATTERN_RING 4            // Ring
struct ncclTopoGraph {
  // Input / output
  int id; // ring : 0, tree : 1, collnet : 2
  int pattern;
  int crossNic;
  int collNet;
  int minChannels;
  int maxChannels;
  // Output
  int nChannels;
  float speedIntra;
  float speedInter;
  int typeIntra;
  int typeInter;
  int sameChannels;
  int nHops;
  int intra[MAXCHANNELS*NCCL_TOPO_MAX_NODES];
  int inter[MAXCHANNELS*2];
};
ncclResult_t ncclTopoCompute(struct ncclTopoSystem* system, struct ncclTopoGraph* graph);

ncclResult_t ncclTopoPrintGraph(struct ncclTopoSystem* system, struct ncclTopoGraph* graph);
ncclResult_t ncclTopoDumpGraphs(struct ncclTopoSystem* system, int ngraphs, struct ncclTopoGraph** graphs);

struct ncclTopoRanks {
  int ringRecv[MAXCHANNELS];
  int ringSend[MAXCHANNELS];
  int ringPrev[MAXCHANNELS];
  int ringNext[MAXCHANNELS];
  int treeToParent[MAXCHANNELS];
  int treeToChild0[MAXCHANNELS];
  int treeToChild1[MAXCHANNELS];
};

ncclResult_t ncclTopoPreset(struct ncclComm* comm,
    struct ncclTopoGraph* treeGraph, struct ncclTopoGraph* ringGraph, struct ncclTopoGraph* collNetGraph,
    struct ncclTopoRanks* topoRanks);

ncclResult_t ncclTopoPostset(struct ncclComm* comm, int* firstRanks, int* treePatterns,
    struct ncclTopoRanks** allTopoRanks, int* rings);

ncclResult_t ncclTopoConnectCollNet(struct ncclComm* comm, struct ncclTopoGraph* collNetGraph, int rank);

ncclResult_t ncclTopoTuneModel(struct ncclComm* comm, int minCompCap, int maxCompCap, struct ncclTopoGraph* treeGraph, struct ncclTopoGraph* ringGraph, struct ncclTopoGraph* collNetGraph);
#include "info.h"
ncclResult_t ncclTopoGetAlgoTime(struct ncclInfo* info, int algorithm, int protocol, float* time);

#endif
