/*************************************************************************
 * Copyright (c) 2016-2021, NVIDIA CORPORATION. All rights reserved.
 *
 * See LICENSE.txt for license information
 ************************************************************************/

#ifndef NCCL_TRANSPORT_H_
#define NCCL_TRANSPORT_H_

#include "devcomm.h"
#include "graph.h"
#include "nvmlwrap.h"
#include "core.h"
#include "proxy.h"

#define NTRANSPORTS 3
#define TRANSPORT_P2P 0
#define TRANSPORT_SHM 1
#define TRANSPORT_NET 2

extern struct ncclTransport ncclTransports[];

// Forward declarations
struct ncclRing;
struct ncclConnector;
struct ncclComm;

struct ncclPeerInfo {
  int rank;
  int cudaDev;
  int gdrSupport;
  uint64_t hostHash;
  uint64_t pidHash;
  dev_t shmDev;
  int64_t busId;
};

#define CONNECT_SIZE 128
struct ncclConnect {
  char data[CONNECT_SIZE];
};

struct ncclTransportComm {
  ncclResult_t (*setup)(struct ncclComm* comm, struct ncclTopoGraph* graph, struct ncclPeerInfo*, struct ncclPeerInfo*, struct ncclConnect*, struct ncclConnector*, int channelId, int connIndex);
  ncclResult_t (*connect)(struct ncclComm* comm, struct ncclConnect*, int nranks, int rank, struct ncclConnector*);
  ncclResult_t (*free)(void*);
  ncclResult_t (*proxy)(struct ncclProxyArgs*);
};

struct ncclTransport {
  const char name[4];
  ncclResult_t (*canConnect)(int*, struct ncclTopoSystem* topo, struct ncclTopoGraph* graph, struct ncclPeerInfo*, struct ncclPeerInfo*);
  struct ncclTransportComm send;
  struct ncclTransportComm recv;
};

ncclResult_t ncclTransportP2pConnect(struct ncclComm* comm, struct ncclChannel* channel, int nrecv, int* peerRecv, int nsend, int* peerSend, int connIndex);
ncclResult_t ncclTransportP2pSetup(struct ncclComm* comm, struct ncclTopoGraph* graph, int connIndex);

enum { collNetRecv=0, collNetSend=1 };
int ncclTransportCollNetSetup(struct ncclComm* comm, struct ncclTopoGraph* collNetGraph, struct ncclChannel* channel, int masterRank, int masterPeer, int collNetGraphChannelId, int type);
ncclResult_t ncclTransportCollNetCheck(struct ncclComm* comm, int collNetSetupFail);
ncclResult_t ncclTransportCollNetFree(struct ncclComm* comm);
#endif