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//
// Copyright 2017 Ettus Research
//
// SPDX-License-Identifier: GPL-3.0
//
#include <uhd/transport/zero_copy_flow_ctrl.hpp>
#include <uhd/transport/bounded_buffer.hpp>
#include <uhd/transport/buffer_pool.hpp>
#include <uhd/utils/log.hpp>
#include <uhd/utils/safe_call.hpp>
#include <boost/format.hpp>
#include <boost/make_shared.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/thread.hpp>
#include <boost/bind.hpp>
using namespace uhd;
using namespace uhd::transport;
typedef bounded_buffer<managed_send_buffer::sptr> bounded_buffer_t;
class zero_copy_flow_ctrl_msb : public managed_send_buffer
{
public:
zero_copy_flow_ctrl_msb(
flow_ctrl_func flow_ctrl
) :
_mb(nullptr),
_flow_ctrl(flow_ctrl)
{
/* NOP */
}
~zero_copy_flow_ctrl_msb()
{
/* NOP */
}
void release()
{
if (_mb)
{
_mb->commit(size());
while (_flow_ctrl and not _flow_ctrl(_mb)) {}
_mb.reset();
}
}
UHD_INLINE sptr get(sptr &mb)
{
_mb = mb;
return make(this, _mb->cast<void *>(), _mb->size());
}
private:
sptr _mb;
flow_ctrl_func _flow_ctrl;
};
class zero_copy_flow_ctrl_mrb : public managed_recv_buffer
{
public:
zero_copy_flow_ctrl_mrb(
flow_ctrl_func flow_ctrl
) :
_mb(nullptr),
_flow_ctrl(flow_ctrl)
{
/* NOP */
}
~zero_copy_flow_ctrl_mrb()
{
/* NOP */
}
void release()
{
if (_mb)
{
_mb->commit(size());
while (_flow_ctrl and not _flow_ctrl(_mb)) {}
_mb.reset();
}
}
UHD_INLINE sptr get(sptr &mb)
{
_mb = mb;
return make(this, _mb->cast<void *>(), _mb->size());
}
private:
sptr _mb;
flow_ctrl_func _flow_ctrl;
};
/***********************************************************************
* Zero copy offload transport:
* An intermediate transport that utilizes threading to free
* the main thread from any receive work.
**********************************************************************/
class zero_copy_flow_ctrl_impl : public zero_copy_flow_ctrl {
public:
typedef boost::shared_ptr<zero_copy_flow_ctrl_impl> sptr;
zero_copy_flow_ctrl_impl(zero_copy_if::sptr transport,
flow_ctrl_func send_flow_ctrl,
flow_ctrl_func recv_flow_ctrl) :
_transport(transport),
_send_buffers(transport->get_num_send_frames()),
_recv_buffers(transport->get_num_recv_frames()),
_send_buff_index(0),
_recv_buff_index(0),
_send_flow_ctrl(send_flow_ctrl),
_recv_flow_ctrl(recv_flow_ctrl)
{
UHD_LOG_TRACE("TRANSPORT", "Created zero_copy_flow_ctrl");
for (size_t i = 0; i < transport->get_num_send_frames(); i++)
{
_send_buffers[i] = boost::make_shared<zero_copy_flow_ctrl_msb>(_send_flow_ctrl);
}
for (size_t i = 0; i < transport->get_num_recv_frames(); i++)
{
_recv_buffers[i] = boost::make_shared<zero_copy_flow_ctrl_mrb>(_recv_flow_ctrl);
}
}
~zero_copy_flow_ctrl_impl()
{
}
/*******************************************************************
* Receive implementation:
* Pop the receive buffer pointer from the underlying transport
******************************************************************/
UHD_INLINE managed_recv_buffer::sptr get_recv_buff(double timeout)
{
managed_recv_buffer::sptr ptr;
managed_recv_buffer::sptr buff = _transport->get_recv_buff(timeout);
if (buff)
{
boost::shared_ptr<zero_copy_flow_ctrl_mrb> mb = _recv_buffers[_recv_buff_index++];
_recv_buff_index %= _recv_buffers.size();
ptr = mb->get(buff);
}
return ptr;
}
UHD_INLINE size_t get_num_recv_frames() const
{
return _transport->get_num_recv_frames();
}
UHD_INLINE size_t get_recv_frame_size() const
{
return _transport->get_recv_frame_size();
}
/*******************************************************************
* Send implementation:
* Pass the send buffer pointer from the underlying transport
******************************************************************/
managed_send_buffer::sptr get_send_buff(double timeout)
{
managed_send_buffer::sptr ptr;
managed_send_buffer::sptr buff = _transport->get_send_buff(timeout);
if (buff)
{
boost::shared_ptr<zero_copy_flow_ctrl_msb> mb = _send_buffers[_send_buff_index++];
_send_buff_index %= _send_buffers.size();
ptr = mb->get(buff);
}
return ptr;
}
UHD_INLINE size_t get_num_send_frames() const
{
return _transport->get_num_send_frames();
}
UHD_INLINE size_t get_send_frame_size() const
{
return _transport->get_send_frame_size();
}
private:
// The underlying transport
zero_copy_if::sptr _transport;
// buffers
std::vector< boost::shared_ptr<zero_copy_flow_ctrl_msb> > _send_buffers;
std::vector< boost::shared_ptr<zero_copy_flow_ctrl_mrb> > _recv_buffers;
size_t _send_buff_index;
size_t _recv_buff_index;
// Flow control functions
flow_ctrl_func _send_flow_ctrl;
flow_ctrl_func _recv_flow_ctrl;
};
zero_copy_flow_ctrl::sptr zero_copy_flow_ctrl::make(
zero_copy_if::sptr transport,
flow_ctrl_func send_flow_ctrl,
flow_ctrl_func recv_flow_ctrl
)
{
zero_copy_flow_ctrl_impl::sptr zero_copy_flow_ctrl(
new zero_copy_flow_ctrl_impl(transport, send_flow_ctrl, recv_flow_ctrl)
);
return zero_copy_flow_ctrl;
}
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