/* Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License. */

#include "paddle/fluid/operators/collective/recv_v2_op.h"

#if defined(PADDLE_WITH_ASCEND_CL)
#include "paddle/fluid/platform/collective_helper.h"
#include "paddle/fluid/platform/hccl_helper.h"
#endif

namespace paddle {
namespace operators {

template <typename T>
class CRecvOpASCENDKernel : public framework::OpKernel<T> {
 public:
  void Compute(const framework::ExecutionContext& ctx) const override {
#if defined(PADDLE_WITH_ASCEND_CL)
    auto out = ctx.Output<framework::LoDTensor>("Out");
    int numel = out->numel();
    hcclDataType_t dtype = platform::ToHCCLDataType(out->type());

    int ring_id = ctx.Attr<int>("ring_id");
    auto place = ctx.GetPlace();
    auto comm = platform::HCCLCommContext::Instance().Get(ring_id, place);

    aclrtStream stream = nullptr;
    if (ctx.Attr<bool>("use_calc_stream")) {
      auto dev_ctx = platform::DeviceContextPool::Instance().Get(place);
      stream = static_cast<platform::NPUDeviceContext*>(dev_ctx)->stream();
    } else {
      stream = comm->stream();
    }
    std::string tag = std::to_string(ring_id) + "_" + std::to_string(comm->NextTagId());
    std::string group = std::string(HCOM_GROUP_PREFIX) + std::to_string(ring_id);
    int srcRank = ctx.Attr<int>("peer");
    int srTag = ctx.Attr<int>("srTag");
    VLOG(3) << "recv_v2_npu attr get";
    PADDLE_ENFORCE_NPU_SUCCESS(platform::dynload::hcom_receive(
        tag.c_str(), reinterpret_cast<void*>(const_cast<T*>(out->data<T>())), (u64)numel, dtype, srcRank,
          srTag, group.c_str(), stream));
     VLOG(3) << "Source Rank: " << srcRank << " Invoke hcom receive. receiving ";
    out->Resize(out->dims());
    out->set_lod(out->lod());
#else
    PADDLE_THROW(platform::errors::PreconditionNotMet(
        "PaddlePaddle should compile with NPU."));
#endif
  }
};

}  // namespace operators
}  // namespace paddle

namespace ops = paddle::operators;
namespace plat = paddle::platform;

REGISTER_OP_NPU_KERNEL(recv_v2,
                        ops::CRecvOpASCENDKernel<int>,
                        ops::CRecvOpASCENDKernel<int8_t>,
                        ops::CRecvOpASCENDKernel<float>,
                        ops::CRecvOpASCENDKernel<plat::float16>);