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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 "../../transport/vrt_packet_handler.hpp"
#include "usrp2_impl.hpp"
#include "usrp2_regs.hpp"
#include <uhd/utils/thread_priority.hpp>
#include <uhd/transport/convert_types.hpp>
#include <uhd/transport/alignment_buffer.hpp>
#include <boost/format.hpp>
#include <boost/asio.hpp> //htonl and ntohl
#include <boost/bind.hpp>
#include <boost/thread.hpp>
#include <iostream>
using namespace uhd;
using namespace uhd::usrp;
using namespace uhd::transport;
namespace asio = boost::asio;
static const int underflow_flags = async_metadata_t::EVENT_CODE_UNDERFLOW | async_metadata_t::EVENT_CODE_UNDERFLOW_IN_PACKET;
/***********************************************************************
* io impl details (internal to this file)
* - pirate crew
* - alignment buffer
* - thread loop
* - vrt packet handler states
**********************************************************************/
struct usrp2_impl::io_impl{
typedef alignment_buffer<managed_recv_buffer::sptr, time_spec_t> alignment_buffer_type;
io_impl(size_t num_frames, size_t width):
packet_handler_recv_state(width),
recv_pirate_booty(alignment_buffer_type::make(num_frames, width)),
async_msg_fifo(bounded_buffer<async_metadata_t>::make(100/*messages deep*/))
{
/* NOP */
}
~io_impl(void){
recv_pirate_crew_raiding = false;
recv_pirate_crew.interrupt_all();
recv_pirate_crew.join_all();
}
bool get_recv_buffs(vrt_packet_handler::managed_recv_buffs_t &buffs, double timeout){
boost::this_thread::disable_interruption di; //disable because the wait can throw
return recv_pirate_booty->pop_elems_with_timed_wait(buffs, timeout);
}
//state management for the vrt packet handler code
vrt_packet_handler::recv_state packet_handler_recv_state;
vrt_packet_handler::send_state packet_handler_send_state;
//methods and variables for the pirate crew
void recv_pirate_loop(zero_copy_if::sptr, usrp2_mboard_impl::sptr, size_t);
boost::thread_group recv_pirate_crew;
bool recv_pirate_crew_raiding;
alignment_buffer_type::sptr recv_pirate_booty;
bounded_buffer<async_metadata_t>::sptr async_msg_fifo;
};
/***********************************************************************
* Receive Pirate Loop
* - while raiding, loot for recv buffers
* - put booty into the alignment buffer
**********************************************************************/
void usrp2_impl::io_impl::recv_pirate_loop(
zero_copy_if::sptr zc_if,
usrp2_mboard_impl::sptr mboard,
size_t index
){
set_thread_priority_safe();
recv_pirate_crew_raiding = true;
size_t next_packet_seq = 0;
while(recv_pirate_crew_raiding){
managed_recv_buffer::sptr buff = zc_if->get_recv_buff();
if (not buff.get()) continue; //ignore timeout/error buffers
try{
//extract the vrt header packet info
vrt::if_packet_info_t if_packet_info;
if_packet_info.num_packet_words32 = buff->size()/sizeof(boost::uint32_t);
const boost::uint32_t *vrt_hdr = buff->cast<const boost::uint32_t *>();
vrt::if_hdr_unpack_be(vrt_hdr, if_packet_info);
//handle a tx async report message
if (if_packet_info.sid == 1 and if_packet_info.packet_type != vrt::if_packet_info_t::PACKET_TYPE_DATA){
//fill in the async metadata
async_metadata_t metadata;
metadata.channel = index;
metadata.has_time_spec = if_packet_info.has_tsi and if_packet_info.has_tsf;
metadata.time_spec = time_spec_t(
time_t(if_packet_info.tsi), size_t(if_packet_info.tsf), mboard->get_master_clock_freq()
);
metadata.event_code = vrt_packet_handler::get_context_code<async_metadata_t::event_code_t>(vrt_hdr, if_packet_info);
//print the famous U, and push the metadata into the message queue
if (metadata.event_code & underflow_flags) std::cerr << "U" << std::flush;
async_msg_fifo->push_with_pop_on_full(metadata);
continue;
}
//handle the packet count / sequence number
if (if_packet_info.packet_count != next_packet_seq){
//std::cerr << "S" << (if_packet_info.packet_count - next_packet_seq)%16;
std::cerr << "O" << std::flush; //report overflow (drops in the kernel)
}
next_packet_seq = (if_packet_info.packet_count+1)%16;
//extract the timespec and round to the nearest packet
UHD_ASSERT_THROW(if_packet_info.has_tsi and if_packet_info.has_tsf);
time_spec_t time(
time_t(if_packet_info.tsi), size_t(if_packet_info.tsf), mboard->get_master_clock_freq()
);
//push the packet into the buffer with the new time
recv_pirate_booty->push_with_pop_on_full(buff, time, index);
}catch(const std::exception &e){
std::cerr << "Error (usrp2 recv pirate loop): " << e.what() << std::endl;
}
}
}
/***********************************************************************
* Helper Functions
**********************************************************************/
void usrp2_impl::io_init(void){
//send a small data packet so the usrp2 knows the udp source port
BOOST_FOREACH(zero_copy_if::sptr data_transport, _data_transports){
managed_send_buffer::sptr send_buff = data_transport->get_send_buff();
static const boost::uint32_t data = htonl(USRP2_INVALID_VRT_HEADER);
std::memcpy(send_buff->cast<void*>(), &data, sizeof(data));
send_buff->commit(sizeof(data));
//drain the recv buffers (may have junk)
while (data_transport->get_recv_buff().get()){};
}
//the number of recv frames is the number for the first transport
//the assumption is that all data transports should be identical
size_t num_frames = _data_transports.front()->get_num_recv_frames();
//create new io impl
_io_impl = UHD_PIMPL_MAKE(io_impl, (num_frames, _data_transports.size()));
//create a new pirate thread for each zc if (yarr!!)
for (size_t i = 0; i < _data_transports.size(); i++){
_io_impl->recv_pirate_crew.create_thread(boost::bind(
&usrp2_impl::io_impl::recv_pirate_loop,
_io_impl.get(), _data_transports.at(i),
_mboards.at(i), i
));
}
}
/***********************************************************************
* Async Data
**********************************************************************/
bool usrp2_impl::recv_async_msg(
async_metadata_t &async_metadata, double timeout
){
boost::this_thread::disable_interruption di; //disable because the wait can throw
return _io_impl->async_msg_fifo->pop_with_timed_wait(async_metadata, timeout);
}
/***********************************************************************
* Send Data
**********************************************************************/
static bool get_send_buffs(
const std::vector<udp_zero_copy::sptr> &trans,
vrt_packet_handler::managed_send_buffs_t &buffs,
double timeout
){
UHD_ASSERT_THROW(trans.size() == buffs.size());
bool good = true;
for (size_t i = 0; i < buffs.size(); i++){
buffs[i] = trans[i]->get_send_buff(timeout);
good = good and (buffs[i].get() != NULL);
}
return good;
}
size_t usrp2_impl::send(
const std::vector<const void *> &buffs, size_t num_samps,
const tx_metadata_t &metadata, const io_type_t &io_type,
send_mode_t send_mode, double timeout
){
return vrt_packet_handler::send(
_io_impl->packet_handler_send_state, //last state of the send handler
buffs, num_samps, //buffer to fill
metadata, send_mode, //samples metadata
io_type, _io_helper.get_tx_otw_type(), //input and output types to convert
_mboards.front()->get_master_clock_freq(), //master clock tick rate
uhd::transport::vrt::if_hdr_pack_be,
boost::bind(&get_send_buffs, _data_transports, _1, timeout),
get_max_send_samps_per_packet()
);
}
/***********************************************************************
* Receive Data
**********************************************************************/
size_t usrp2_impl::recv(
const std::vector<void *> &buffs, size_t num_samps,
rx_metadata_t &metadata, const io_type_t &io_type,
recv_mode_t recv_mode, double timeout
){
return vrt_packet_handler::recv(
_io_impl->packet_handler_recv_state, //last state of the recv handler
buffs, num_samps, //buffer to fill
metadata, recv_mode, //samples metadata
io_type, _io_helper.get_rx_otw_type(), //input and output types to convert
_mboards.front()->get_master_clock_freq(), //master clock tick rate
uhd::transport::vrt::if_hdr_unpack_be,
boost::bind(&usrp2_impl::io_impl::get_recv_buffs, _io_impl.get(), _1, timeout)
);
}
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