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//
// Copyright 2019 Ettus Research, a National Instruments brand
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#ifndef INCLUDED_UHDLIB_TRANSPORT_LIBERIO_LINK_HPP
#define INCLUDED_UHDLIB_TRANSPORT_LIBERIO_LINK_HPP
#include <uhd/config.hpp>
#include <uhd/transport/buffer_pool.hpp>
#include <uhd/types/device_addr.hpp>
#include <uhdlib/transport/adapter_info.hpp>
#include <uhdlib/transport/link_base.hpp>
#include <liberio/liberio.h>
#include <cassert>
#include <string>
#include <vector>
namespace uhd { namespace transport {
class liberio_frame_buff : public frame_buff
{
public:
liberio_frame_buff(struct liberio_chan* chan) : _chan(chan)
{
assert(_chan);
// Acquire channel reference
liberio_chan_get(_chan);
}
~liberio_frame_buff()
{
if (_buff) {
// Set payload size to signify "empty"
liberio_buf_set_payload(_buff, 0, 0);
// Release buffer back to liberio
liberio_chan_buf_enqueue(_chan, _buff);
_buff = nullptr;
_data = nullptr;
}
// Release channel reference
liberio_chan_put(_chan);
}
liberio_frame_buff(const liberio_frame_buff& src)
: liberio_frame_buff(src._chan) {}
UHD_FORCE_INLINE size_t get(int32_t timeout_ms)
{
// Dequeue timeout in microseconds
_buff = liberio_chan_buf_dequeue(_chan, timeout_ms * 1000);
if (!_buff) {
return 0;
}
_packet_size = liberio_buf_get_len(_buff, 0);
_data = liberio_buf_get_mem(_buff, 0);
return _packet_size;
}
UHD_FORCE_INLINE void release()
{
assert(_buff);
liberio_buf_set_payload(_buff, 0, _packet_size);
liberio_chan_buf_enqueue(_chan, _buff);
_buff = nullptr;
_data = nullptr;
}
private:
struct liberio_buf* _buff = nullptr;
struct liberio_chan* _chan;
};
class liberio_adapter_info : public adapter_info
{
public:
liberio_adapter_info() = default;
~liberio_adapter_info() = default;
std::string to_string()
{
// Currently, there is only ever one liberio adapter
// If that changes, fix this!
return std::string("Liberio");
}
bool operator==(const liberio_adapter_info& /*rhs*/) const
{
// Currently, there is only ever one liberio adapter
// If that changes, fix this!
return true;
}
};
/*!
* A zero copy transport interface to the liberio DMA library.
*/
class liberio_link : public recv_link_base<liberio_link>,
public send_link_base<liberio_link>
{
public:
using sptr = std::shared_ptr<liberio_link>;
liberio_link(
const std::string& tx_path, const std::string& rx_path, const link_params_t& params);
~liberio_link();
/*!
* Make a new liberio link.
*
* \param tx_path a path string to the TX DMA device
* \param rx_path a path string to the RX DMA device
* \param params Values for frame sizes, num frames, and buffer sizes
* \return a shared_ptr to a new liberio link
*/
static sptr make(const std::string& tx_path,
const std::string& rx_path,
const link_params_t& params);
/*!
* Get the physical adapter ID used for this link
*/
adapter_id_t get_send_adapter_id() const
{
return _adapter_id;
}
/*!
* Get the physical adapter ID used for this link
*/
adapter_id_t get_recv_adapter_id() const
{
return _adapter_id;
}
private:
using recv_link_base_t = recv_link_base<liberio_link>;
using send_link_base_t = send_link_base<liberio_link>;
// Friend declarations to allow base classes to call private methods
friend recv_link_base_t;
friend send_link_base_t;
// Methods called by recv_link_base
size_t get_recv_buff_derived(frame_buff& buff, int32_t timeout_ms)
{
auto& buffer = static_cast<liberio_frame_buff&>(buff);
return buffer.get(timeout_ms);
}
void release_recv_buff_derived(frame_buff& buff)
{
auto& buffer = static_cast<liberio_frame_buff&>(buff);
buffer.release();
}
bool get_send_buff_derived(frame_buff& buff, int32_t timeout_ms)
{
auto& buffer = static_cast<liberio_frame_buff&>(buff);
return buffer.get(timeout_ms);
}
void release_send_buff_derived(frame_buff& buff)
{
auto& buffer = static_cast<liberio_frame_buff&>(buff);
buffer.release();
}
struct liberio_chan* _tx_chan;
struct liberio_chan* _rx_chan;
std::vector<liberio_frame_buff> _recv_buffs;
std::vector<liberio_frame_buff> _send_buffs;
adapter_id_t _adapter_id;
};
}} // namespace uhd::transport
#endif /* INCLUDED_UHDLIB_TRANSPORT_LIBERIO_LINK_HPP */
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