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//
// Copyright 2010 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <uhd/transport/udp_zero_copy.hpp>
#include <uhd/utils/assert.hpp>
#include <boost/cstdint.hpp>
#include <boost/asio.hpp>
#include <boost/format.hpp>
#include <iostream>
using namespace uhd::transport;
/***********************************************************************
* Constants
**********************************************************************/
static const size_t MIN_SOCK_BUFF_SIZE = size_t(100e3);
static const size_t MAX_DGRAM_SIZE = 2048; //assume max size on send and recv
static const double RECV_TIMEOUT = 0.1; // 100 ms
/***********************************************************************
* Managed receive buffer implementation for udp zero-copy asio:
**********************************************************************/
class managed_recv_buffer_impl : public managed_recv_buffer{
public:
managed_recv_buffer_impl(const boost::asio::const_buffer &buff) : _buff(buff){
/* NOP */
}
~managed_recv_buffer_impl(void){
delete [] this->cast<const boost::uint8_t *>();
}
private:
const boost::asio::const_buffer &get(void) const{
return _buff;
}
const boost::asio::const_buffer _buff;
};
/***********************************************************************
* Managed send buffer implementation for udp zero-copy asio:
**********************************************************************/
class managed_send_buffer_impl : public managed_send_buffer{
public:
managed_send_buffer_impl(
const boost::asio::mutable_buffer &buff,
boost::asio::ip::udp::socket *socket
) : _buff(buff), _socket(socket){
/* NOP */
}
~managed_send_buffer_impl(void){
/* NOP */
}
void commit(size_t num_bytes){
_socket->send(boost::asio::buffer(_buff, num_bytes));
}
private:
const boost::asio::mutable_buffer &get(void) const{
return _buff;
}
const boost::asio::mutable_buffer _buff;
boost::asio::ip::udp::socket *_socket;
};
/***********************************************************************
* Zero Copy UDP implementation with ASIO:
* This is the portable zero copy implementation for systems
* where a faster, platform specific solution is not available.
* However, it is not a true zero copy implementation as each
* send and recv requires a copy operation to/from userspace.
**********************************************************************/
class udp_zero_copy_impl : public udp_zero_copy{
public:
typedef boost::shared_ptr<udp_zero_copy_impl> sptr;
//structors
udp_zero_copy_impl(const std::string &addr, const std::string &port);
~udp_zero_copy_impl(void);
//send/recv
managed_recv_buffer::sptr get_recv_buff(void);
managed_send_buffer::sptr get_send_buff(void);
//manage buffer
template <typename Opt> size_t get_buff_size(void){
Opt option;
_socket->get_option(option);
return option.value();
}
template <typename Opt> size_t resize_buff(size_t num_bytes){
Opt option(num_bytes);
_socket->set_option(option);
return get_buff_size<Opt>();
}
private:
boost::asio::ip::udp::socket *_socket;
boost::asio::io_service _io_service;
//send and recv buffer memory (allocated once)
boost::uint8_t _send_mem[MIN_SOCK_BUFF_SIZE];
managed_send_buffer::sptr _send_buff;
};
udp_zero_copy_impl::udp_zero_copy_impl(const std::string &addr, const std::string &port){
//std::cout << boost::format("Creating udp transport for %s %s") % addr % port << std::endl;
// resolve the address
boost::asio::ip::udp::resolver resolver(_io_service);
boost::asio::ip::udp::resolver::query query(boost::asio::ip::udp::v4(), addr, port);
boost::asio::ip::udp::endpoint receiver_endpoint = *resolver.resolve(query);
// create, open, and connect the socket
_socket = new boost::asio::ip::udp::socket(_io_service);
_socket->open(boost::asio::ip::udp::v4());
_socket->connect(receiver_endpoint);
// create the managed send buff (just once)
_send_buff = managed_send_buffer::sptr(new managed_send_buffer_impl(
boost::asio::buffer(_send_mem, MIN_SOCK_BUFF_SIZE), _socket
));
// set recv timeout
timeval tv;
tv.tv_sec = 0;
tv.tv_usec = size_t(RECV_TIMEOUT*1e6);
UHD_ASSERT_THROW(setsockopt(
_socket->native(),
SOL_SOCKET, SO_RCVTIMEO,
(const char *)&tv, sizeof(timeval)
) == 0);
}
udp_zero_copy_impl::~udp_zero_copy_impl(void){
delete _socket;
}
managed_recv_buffer::sptr udp_zero_copy_impl::get_recv_buff(void){
//allocate memory
boost::uint8_t *recv_mem = new boost::uint8_t[MAX_DGRAM_SIZE];
//call recv() with timeout option
size_t num_bytes = _socket->receive(boost::asio::buffer(recv_mem, MAX_DGRAM_SIZE));
//create a new managed buffer to house the data
return managed_recv_buffer::sptr(
new managed_recv_buffer_impl(boost::asio::buffer(recv_mem, num_bytes))
);
}
managed_send_buffer::sptr udp_zero_copy_impl::get_send_buff(void){
return _send_buff; //FIXME there is only ever one send buff, we assume that the caller doesnt hang onto these
}
/***********************************************************************
* UDP zero copy make function
**********************************************************************/
template<typename Opt> static inline void resize_buff_helper(
udp_zero_copy_impl::sptr udp_trans,
size_t target_size,
const std::string &name
){
//resize the buffer if size was provided
if (target_size > 0){
size_t actual_size = udp_trans->resize_buff<Opt>(target_size);
if (target_size != actual_size) std::cout << boost::format(
"Target %s buffer size: %d\n"
"Actual %s byffer size: %d"
) % name % target_size % name % actual_size << std::endl;
}
//otherwise, ensure that the buffer is at least the minimum size
else if (udp_trans->get_buff_size<Opt>() < MIN_SOCK_BUFF_SIZE){
resize_buff_helper<Opt>(udp_trans, MIN_SOCK_BUFF_SIZE, name);
}
}
udp_zero_copy::sptr udp_zero_copy::make(
const std::string &addr,
const std::string &port,
size_t recv_buff_size,
size_t send_buff_size
){
udp_zero_copy_impl::sptr udp_trans(new udp_zero_copy_impl(addr, port));
//call the helper to resize send and recv buffers
resize_buff_helper<boost::asio::socket_base::receive_buffer_size>(udp_trans, recv_buff_size, "recv");
resize_buff_helper<boost::asio::socket_base::send_buffer_size> (udp_trans, send_buff_size, "send");
return udp_trans;
}
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