diff options
Diffstat (limited to 'host/lib/usrp/usrp2/io_impl.cpp')
| -rw-r--r-- | host/lib/usrp/usrp2/io_impl.cpp | 529 |
1 files changed, 529 insertions, 0 deletions
diff --git a/host/lib/usrp/usrp2/io_impl.cpp b/host/lib/usrp/usrp2/io_impl.cpp new file mode 100644 index 000000000..340e9d155 --- /dev/null +++ b/host/lib/usrp/usrp2/io_impl.cpp @@ -0,0 +1,529 @@ +// +// Copyright 2010-2011 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/exception.hpp> +#include <uhd/usrp/mboard_props.hpp> +#include <uhd/utils/byteswap.hpp> +#include <uhd/utils/thread_priority.hpp> +#include <uhd/transport/bounded_buffer.hpp> +#include <boost/format.hpp> +#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; +namespace pt = boost::posix_time; + +/*********************************************************************** + * helpers + **********************************************************************/ +static UHD_INLINE pt::time_duration to_time_dur(double timeout){ + return pt::microseconds(long(timeout*1e6)); +} + +static UHD_INLINE double from_time_dur(const pt::time_duration &time_dur){ + return 1e-6*time_dur.total_microseconds(); +} + +/*********************************************************************** + * constants + **********************************************************************/ +static const int underflow_flags = 0 + | async_metadata_t::EVENT_CODE_UNDERFLOW + | async_metadata_t::EVENT_CODE_UNDERFLOW_IN_PACKET +; + +static const size_t vrt_send_header_offset_words32 = 1; + +/*********************************************************************** + * flow control monitor for a single tx channel + * - the pirate thread calls update + * - the get send buffer calls check + **********************************************************************/ +class flow_control_monitor{ +public: + typedef boost::uint32_t seq_type; + typedef boost::shared_ptr<flow_control_monitor> sptr; + + /*! + * Make a new flow control monitor. + * \param max_seqs_out num seqs before throttling + */ + flow_control_monitor(seq_type max_seqs_out){ + _last_seq_out = 0; + _last_seq_ack = 0; + _max_seqs_out = max_seqs_out; + _ready_fcn = boost::bind(&flow_control_monitor::ready, this); + } + + /*! + * Check the flow control condition. + * \param seq the sequence to go out + * \param timeout the timeout in seconds + * \return false on timeout + */ + UHD_INLINE bool check_fc_condition(seq_type seq, double timeout){ + boost::unique_lock<boost::mutex> lock(_fc_mutex); + _last_seq_out = seq; + if (this->ready()) return true; + boost::this_thread::disable_interruption di; //disable because the wait can throw + return _fc_cond.timed_wait(lock, to_time_dur(timeout), _ready_fcn); + } + + /*! + * Update the flow control condition. + * \param seq the last sequence number to be ACK'd + */ + UHD_INLINE void update_fc_condition(seq_type seq){ + boost::unique_lock<boost::mutex> lock(_fc_mutex); + _last_seq_ack = seq; + lock.unlock(); + _fc_cond.notify_one(); + } + +private: + bool ready(void){ + return seq_type(_last_seq_out -_last_seq_ack) < _max_seqs_out; + } + + boost::mutex _fc_mutex; + boost::condition _fc_cond; + seq_type _last_seq_out, _last_seq_ack, _max_seqs_out; + boost::function<bool(void)> _ready_fcn; +}; + +/*********************************************************************** + * Alignment indexes class: keeps track of indexes + **********************************************************************/ +class alignment_indexes{ +public: + alignment_indexes(void){_indexes = 0;} + void reset(size_t len){_indexes = (1 << len) - 1;} + size_t front(void){ //TODO replace with look-up table + size_t index = 0; + while ((_indexes & (1 << index)) == 0) index++; + return index; + } + void remove(size_t index){_indexes &= ~(1 << index);} + bool empty(void){return _indexes == 0;} +private: size_t _indexes; +}; + +/*********************************************************************** + * io impl details (internal to this file) + * - pirate crew + * - alignment buffer + * - thread loop + * - vrt packet handler states + **********************************************************************/ +struct usrp2_impl::io_impl{ + + io_impl(std::vector<zero_copy_if::sptr> &dsp_xports): + dsp_xports(dsp_xports), //the assumption is that all data transports should be identical + get_recv_buffs_fcn(boost::bind(&usrp2_impl::io_impl::get_recv_buffs, this, _1)), + get_send_buffs_fcn(boost::bind(&usrp2_impl::io_impl::get_send_buffs, this, _1)), + async_msg_fifo(100/*messages deep*/) + { + for (size_t i = 0; i < dsp_xports.size(); i++){ + fc_mons.push_back(flow_control_monitor::sptr(new flow_control_monitor( + usrp2_impl::sram_bytes/dsp_xports.front()->get_send_frame_size() + )));; + } + + //init empty packet infos + vrt::if_packet_info_t packet_info = vrt::if_packet_info_t(); + packet_info.packet_count = 0xf; + packet_info.has_tsi = true; + packet_info.tsi = 0; + packet_info.has_tsf = true; + packet_info.tsf = 0; + prev_infos.resize(dsp_xports.size(), packet_info); + } + + ~io_impl(void){ + recv_pirate_crew_raiding = false; + recv_pirate_crew.interrupt_all(); + recv_pirate_crew.join_all(); + } + + bool get_send_buffs(vrt_packet_handler::managed_send_buffs_t &buffs){ + UHD_ASSERT_THROW(send_map.size() == buffs.size()); + + //calculate the flow control word + const boost::uint32_t fc_word32 = packet_handler_send_state.next_packet_seq; + + //grab a managed buffer for each index + for (size_t i = 0; i < buffs.size(); i++){ + if (not fc_mons[send_map[i]]->check_fc_condition(fc_word32, send_timeout)) return false; + buffs[i] = dsp_xports[send_map[i]]->get_send_buff(send_timeout); + if (not buffs[i].get()) return false; + buffs[i]->cast<boost::uint32_t *>()[0] = uhd::htonx(fc_word32); + } + return true; + } + + alignment_indexes indexes_to_do; //used in alignment logic + time_spec_t expected_time; //used in alignment logic + bool get_recv_buffs(vrt_packet_handler::managed_recv_buffs_t &buffs); + + std::vector<zero_copy_if::sptr> &dsp_xports; + + //mappings from channel index to dsp xport + std::vector<size_t> send_map, recv_map; + + //timeouts set on calls to recv/send (passed into get buffs methods) + double recv_timeout, send_timeout; + + //bound callbacks for get buffs (bound once here, not in fast-path) + vrt_packet_handler::get_recv_buffs_t get_recv_buffs_fcn; + vrt_packet_handler::get_send_buffs_t get_send_buffs_fcn; + + //previous state for each buffer + std::vector<vrt::if_packet_info_t> prev_infos; + + //flow control monitors + std::vector<flow_control_monitor::sptr> fc_mons; + + //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(usrp2_mboard_impl::sptr, zero_copy_if::sptr, size_t); + boost::thread_group recv_pirate_crew; + bool recv_pirate_crew_raiding; + bounded_buffer<async_metadata_t> async_msg_fifo; + boost::mutex spawn_mutex; +}; + +/*********************************************************************** + * Receive Pirate Loop + * - while raiding, loot for message packet + * - update flow control condition count + * - put async message packets into queue + **********************************************************************/ +void usrp2_impl::io_impl::recv_pirate_loop( + usrp2_mboard_impl::sptr mboard, zero_copy_if::sptr err_xport, size_t index +){ + set_thread_priority_safe(); + recv_pirate_crew_raiding = true; + + spawn_mutex.unlock(); + + //store a reference to the flow control monitor (offset by max dsps) + flow_control_monitor &fc_mon = *(this->fc_mons[index*usrp2_mboard_impl::MAX_NUM_DSPS]); + + while(recv_pirate_crew_raiding){ + managed_recv_buffer::sptr buff = err_xport->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 == usrp2_impl::ASYNC_SID 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); + + //catch the flow control packets and react + if (metadata.event_code == 0){ + boost::uint32_t fc_word32 = (vrt_hdr + if_packet_info.num_header_words32)[1]; + fc_mon.update_fc_condition(uhd::ntohx(fc_word32)); + continue; + } + + //print the famous U, and push the metadata into the message queue + if (metadata.event_code & underflow_flags) std::cerr << "U" << std::flush; + //else std::cout << "metadata.event_code " << metadata.event_code << std::endl; + async_msg_fifo.push_with_pop_on_full(metadata); + } + else{ + //TODO unknown received packet, may want to print error... + } + }catch(const std::exception &e){ + std::cerr << "Error (usrp2 recv pirate loop): " << e.what() << std::endl; + } + } +} + +/*********************************************************************** + * Helper Functions + **********************************************************************/ +void usrp2_impl::io_init(void){ + + //create new io impl + _io_impl = UHD_PIMPL_MAKE(io_impl, (dsp_xports)); + + //create a new pirate thread for each zc if (yarr!!) + for (size_t i = 0; i < _mboards.size(); i++){ + //lock the unlocked mutex (non-blocking) + _io_impl->spawn_mutex.lock(); + //spawn a new pirate to plunder the recv booty + _io_impl->recv_pirate_crew.create_thread(boost::bind( + &usrp2_impl::io_impl::recv_pirate_loop, + _io_impl.get(), _mboards.at(i), err_xports.at(i), i + )); + //block here until the spawned thread unlocks + _io_impl->spawn_mutex.lock(); + //exit loop iteration in an unlocked condition + _io_impl->spawn_mutex.unlock(); + } + + //update mapping here since it didnt b4 when io init not called first + update_xport_channel_mapping(); +} + +void usrp2_impl::update_xport_channel_mapping(void){ + if (_io_impl.get() == NULL) return; //not inited yet + + _io_impl->recv_map.clear(); + _io_impl->send_map.clear(); + + for (size_t i = 0; i < _mboards.size(); i++){ + + subdev_spec_t rx_subdev_spec = _mboards[i]->get_link()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>(); + for (size_t j = 0; j < rx_subdev_spec.size(); j++){ + _io_impl->recv_map.push_back(i*usrp2_mboard_impl::MAX_NUM_DSPS+j); + //std::cout << "recv_map.back() " << _io_impl->recv_map.back() << std::endl; + } + + subdev_spec_t tx_subdev_spec = _mboards[i]->get_link()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>(); + for (size_t j = 0; j < tx_subdev_spec.size(); j++){ + _io_impl->send_map.push_back(i*usrp2_mboard_impl::MAX_NUM_DSPS+j); + //std::cout << "send_map.back() " << _io_impl->send_map.back() << std::endl; + } + + } + + _io_impl->packet_handler_recv_state = vrt_packet_handler::recv_state(_io_impl->recv_map.size()); + _io_impl->packet_handler_send_state = vrt_packet_handler::send_state(_io_impl->send_map.size()); +} + +/*********************************************************************** + * 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 + **********************************************************************/ +size_t usrp2_impl::get_max_send_samps_per_packet(void) const{ + static const size_t hdr_size = 0 + + vrt::max_if_hdr_words32*sizeof(boost::uint32_t) + + vrt_send_header_offset_words32*sizeof(boost::uint32_t) + - sizeof(vrt::if_packet_info_t().cid) //no class id ever used + ; + const size_t bpp = dsp_xports.front()->get_send_frame_size() - hdr_size; + return bpp/_tx_otw_type.get_sample_size(); +} + +size_t usrp2_impl::send( + const send_buffs_type &buffs, size_t num_samps, + const tx_metadata_t &metadata, const io_type_t &io_type, + send_mode_t send_mode, double timeout +){ + _io_impl->send_timeout = 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, _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, + _io_impl->get_send_buffs_fcn, + get_max_send_samps_per_packet(), + vrt_send_header_offset_words32 + ); +} + +/*********************************************************************** + * Alignment logic on receive + **********************************************************************/ +static UHD_INLINE time_spec_t extract_time_spec( + const vrt::if_packet_info_t &packet_info +){ + return time_spec_t( //assumes has_tsi and has_tsf are true + time_t(packet_info.tsi), size_t(packet_info.tsf), + 100e6 //tick rate does not have to be correct for comparison purposes + ); +} + +static UHD_INLINE void extract_packet_info( + managed_recv_buffer::sptr &buff, + vrt::if_packet_info_t &prev_info, + time_spec_t &time, bool &clear, bool &msg +){ + //extract packet info + vrt::if_packet_info_t next_info; + next_info.num_packet_words32 = buff->size()/sizeof(boost::uint32_t); + vrt::if_hdr_unpack_be(buff->cast<const boost::uint32_t *>(), next_info); + + //handle the packet count / sequence number + if ((prev_info.packet_count+1)%16 != next_info.packet_count){ + std::cerr << "O" << std::flush; //report overflow (drops in the kernel) + } + + time = extract_time_spec(next_info); + clear = extract_time_spec(prev_info) > time; + msg = next_info.packet_type != vrt::if_packet_info_t::PACKET_TYPE_DATA; + prev_info = next_info; +} + +static UHD_INLINE bool handle_msg_packet( + vrt_packet_handler::managed_recv_buffs_t &buffs, size_t index +){ + for (size_t i = 0; i < buffs.size(); i++){ + if (i == index) continue; + buffs[i].reset(); //set NULL + } + return true; +} + +UHD_INLINE bool usrp2_impl::io_impl::get_recv_buffs( + vrt_packet_handler::managed_recv_buffs_t &buffs +){ + if (buffs.size() == 1){ + buffs[0] = dsp_xports[recv_map[0]]->get_recv_buff(recv_timeout); + if (buffs[0].get() == NULL) return false; + bool clear, msg; time_spec_t time; //unused variables + //call extract_packet_info to handle printing the overflows + extract_packet_info(buffs[0], this->prev_infos[recv_map[0]], time, clear, msg); + return true; + } + //-------------------- begin alignment logic ---------------------// + UHD_ASSERT_THROW(recv_map.size() == buffs.size()); + boost::system_time exit_time = boost::get_system_time() + to_time_dur(recv_timeout); + managed_recv_buffer::sptr buff_tmp; + bool clear, msg; + size_t index; + + //If we did not enter this routine with an empty indexes set, + //jump to after the clear so we can preserve the previous state. + //This saves buffers from being lost when using non-blocking recv. + if (not indexes_to_do.empty()) goto skip_pop_initial; + + //respond to a clear by starting from scratch + got_clear: + indexes_to_do.reset(buffs.size()); + clear = false; + + //do an initial pop to load an initial sequence id + index = indexes_to_do.front(); + buff_tmp = dsp_xports[recv_map[index]]->get_recv_buff(from_time_dur(exit_time - boost::get_system_time())); + if (buff_tmp.get() == NULL) return false; + extract_packet_info(buff_tmp, this->prev_infos[recv_map[index]], expected_time, clear, msg); + if (clear) goto got_clear; + buffs[index] = buff_tmp; + if (msg) return handle_msg_packet(buffs, index); + indexes_to_do.remove(index); + skip_pop_initial: + + //get an aligned set of elements from the buffers: + while(not indexes_to_do.empty()){ + + //pop an element off for this index + index = indexes_to_do.front(); + buff_tmp = dsp_xports[recv_map[index]]->get_recv_buff(from_time_dur(exit_time - boost::get_system_time())); + if (buff_tmp.get() == NULL) return false; + time_spec_t this_time; + extract_packet_info(buff_tmp, this->prev_infos[recv_map[index]], this_time, clear, msg); + if (clear) goto got_clear; + buffs[index] = buff_tmp; + if (msg) return handle_msg_packet(buffs, index); + + //if the sequence id matches: + // remove this index from the list and continue + if (this_time == expected_time){ + indexes_to_do.remove(index); + } + + //if the sequence id is newer: + // use the new expected time for comparison + // add all other indexes back into the list + else if (this_time > expected_time){ + expected_time = this_time; + indexes_to_do.reset(buffs.size()); + indexes_to_do.remove(index); + } + + //if the sequence id is older: + // continue with the same index to try again + //else if (this_time < expected_time)... + + } + return true; + //-------------------- end alignment logic -----------------------// +} + +/*********************************************************************** + * Receive Data + **********************************************************************/ +size_t usrp2_impl::get_max_recv_samps_per_packet(void) const{ + static const size_t hdr_size = 0 + + vrt::max_if_hdr_words32*sizeof(boost::uint32_t) + + sizeof(vrt::if_packet_info_t().tlr) //forced to have trailer + - sizeof(vrt::if_packet_info_t().cid) //no class id ever used + ; + const size_t bpp = dsp_xports.front()->get_recv_frame_size() - hdr_size; + return bpp/_rx_otw_type.get_sample_size(); +} + +void usrp2_impl::handle_overflow(size_t chan){ + std::cerr << "O" << std::flush; + ldiv_t indexes = ldiv(chan, usrp2_mboard_impl::NUM_RX_DSPS); + _mboards.at(indexes.quot)->handle_overflow(indexes.rem); +} + +size_t usrp2_impl::recv( + const recv_buffs_type &buffs, size_t num_samps, + rx_metadata_t &metadata, const io_type_t &io_type, + recv_mode_t recv_mode, double timeout +){ + _io_impl->recv_timeout = 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, _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, + _io_impl->get_recv_buffs_fcn, + boost::bind(&usrp2_impl::handle_overflow, this, _1) + ); +} |