/*************************************************************************
 * Copyright (c) 2016-2022, NVIDIA CORPORATION. All rights reserved.
 * Modifications Copyright (c) 2020-2022 Advanced Micro Devices, Inc. All rights reserved.
 *
 * See LICENSE.txt for license information
 ************************************************************************/

#include "common.h"
#include "cuda_runtime.h"

void
SendRecvGetCollByteCount(size_t* sendcount, size_t* recvcount, size_t* paramcount,
                         size_t* sendInplaceOffset, size_t* recvInplaceOffset,
                         size_t count, size_t eltSize, int nranks)
{
    *sendcount         = count;
    *recvcount         = count;
    *sendInplaceOffset = 0;
    *recvInplaceOffset = 0;
    *paramcount        = *sendcount;
}

testResult_t
SendRecvInitData(struct threadArgs* args, ncclDataType_t type, ncclRedOp_t op, int root,
                 int rep, int in_place)
{
    size_t sendcount = args->sendBytes / wordSize(type);
    size_t recvcount = args->expectedBytes / wordSize(type);
    int    nranks    = args->nProcs * args->nThreads * args->nGpus;

    for(int i = 0; i < args->nGpus; i++)
    {
        CUDACHECK(cudaSetDevice(args->gpus[i]));
        int rank = ((args->proc * args->nThreads + args->thread) * args->nGpus + i);
        CUDACHECK(cudaMemset(args->recvbuffs[i], 0, args->expectedBytes));
        void* data = in_place ? args->recvbuffs[i] : args->sendbuffs[i];
        TESTCHECK(InitData(data, sendcount, rank * sendcount, type, ncclSum, rep, 1, 0));
        int peer = (rank - 1 + nranks) % nranks;
        TESTCHECK(InitData(args->expected[i], recvcount, peer * recvcount, type, ncclSum,
                           rep, 1, 0));
        CUDACHECK(cudaDeviceSynchronize());
    }
    // We don't support in-place sendrecv
    args->reportErrors = in_place ? 0 : 1;
    return testSuccess;
}

void
SendRecvGetBw(size_t count, int typesize, double sec, double* algBw, double* busBw,
              int nranks)
{
    double baseBw = (double) (count * typesize) / 1.0E9 / sec;

    *algBw        = baseBw;
    double factor = 1;
    *busBw        = baseBw * factor;
}

testResult_t
SendRecvRunColl(void* sendbuff, void* recvbuff, size_t count, ncclDataType_t type,
                ncclRedOp_t op, int root, ncclComm_t comm, cudaStream_t stream)
{
    int nRanks;
    NCCLCHECK(ncclCommCount(comm, &nRanks));
    int rank;
    NCCLCHECK(ncclCommUserRank(comm, &rank));
    int recvPeer = (rank - 1 + nRanks) % nRanks;
    int sendPeer = (rank + 1) % nRanks;

    NCCLCHECK(ncclGroupStart());
    NCCLCHECK(ncclSend(sendbuff, count, type, sendPeer, comm, stream));
    NCCLCHECK(ncclRecv(recvbuff, count, type, recvPeer, comm, stream));
    NCCLCHECK(ncclGroupEnd());
    return testSuccess;
}

struct testColl sendRecvTest = { "SendRecv", SendRecvGetCollByteCount, SendRecvInitData,
                                 SendRecvGetBw, SendRecvRunColl };

void
SendRecvGetBuffSize(size_t* sendcount, size_t* recvcount, size_t count, int nranks)
{
    size_t paramcount, sendInplaceOffset, recvInplaceOffset;
    SendRecvGetCollByteCount(sendcount, recvcount, &paramcount, &sendInplaceOffset,
                             &recvInplaceOffset, count, /*eltSize=*/1, nranks);
}

testResult_t
SendRecvRunTest(struct threadArgs* args, int root, ncclDataType_t type,
                const char* typeName, ncclRedOp_t op, const char* opName)
{
    args->collTest = &sendRecvTest;
    ncclDataType_t* run_types;
    ncclRedOp_t*    run_ops;
    const char **   run_typenames, **run_opnames;
    int             type_count, op_count;

    if((int) type != -1)
    {
        type_count    = 1;
        run_types     = &type;
        run_typenames = &typeName;
    }
    else
    {
        type_count    = test_typenum;
        run_types     = test_types;
        run_typenames = test_typenames;
    }

    if((int) op != -1)
    {
        op_count    = 1;
        run_ops     = &op;
        run_opnames = &opName;
    }
    else
    {
        op_count    = test_opnum;
        run_ops     = test_ops;
        run_opnames = test_opnames;
    }

    for(int i = 0; i < type_count; i++)
    {
        for(int j = 0; j < op_count; j++)
        {
            TESTCHECK(TimeTest(args, run_types[i], run_typenames[i], run_ops[j],
                               run_opnames[j], -1));
        }
    }
    return testSuccess;
}

struct testEngine ncclTestEngine = { SendRecvGetBuffSize, SendRecvRunTest };