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//
// Copyright 2014 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#include <uhd/rfnoc/source_block_ctrl_base.hpp>
#include <uhd/utils/log.hpp>
#include <uhd/rfnoc/constants.hpp>
#include <uhdlib/rfnoc/utils.hpp>
#include <chrono>
#include <thread>
using namespace uhd;
using namespace uhd::rfnoc;
/***********************************************************************
* Streaming operations
**********************************************************************/
void source_block_ctrl_base::issue_stream_cmd(
const uhd::stream_cmd_t &stream_cmd,
const size_t chan
) {
UHD_RFNOC_BLOCK_TRACE() << "source_block_ctrl_base::issue_stream_cmd()" ;
if (_upstream_nodes.empty()) {
UHD_LOGGER_WARNING("RFNOC") << "issue_stream_cmd() not implemented for " << get_block_id() ;
return;
}
for(const node_ctrl_base::node_map_pair_t upstream_node: _upstream_nodes) {
source_node_ctrl::sptr this_upstream_block_ctrl =
boost::dynamic_pointer_cast<source_node_ctrl>(upstream_node.second.lock());
this_upstream_block_ctrl->issue_stream_cmd(stream_cmd, chan);
}
}
/***********************************************************************
* Stream signatures
**********************************************************************/
stream_sig_t source_block_ctrl_base::get_output_signature(size_t block_port) const
{
if (not _tree->exists(_root_path / "ports" / "out" / block_port)) {
throw uhd::runtime_error(str(
boost::format("Invalid port number %d for block %s")
% block_port % unique_id()
));
}
return _resolve_port_def(
_tree->access<blockdef::port_t>(_root_path / "ports" / "out" / block_port).get()
);
}
std::vector<size_t> source_block_ctrl_base::get_output_ports() const
{
std::vector<size_t> output_ports;
output_ports.reserve(_tree->list(_root_path / "ports" / "out").size());
for(const std::string port: _tree->list(_root_path / "ports" / "out")) {
output_ports.push_back(boost::lexical_cast<size_t>(port));
}
return output_ports;
}
/***********************************************************************
* FPGA Configuration
**********************************************************************/
void source_block_ctrl_base::set_destination(
uint32_t next_address,
size_t output_block_port
) {
UHD_RFNOC_BLOCK_TRACE() << "source_block_ctrl_base::set_destination() " << uhd::sid_t(next_address) ;
sid_t new_sid(next_address);
new_sid.set_src(get_address(output_block_port));
UHD_RFNOC_BLOCK_TRACE() << " Setting SID: " << new_sid << " ";
sr_write(SR_NEXT_DST_SID, (1<<16) | next_address, output_block_port);
}
void source_block_ctrl_base::configure_flow_control_out(
bool enable_fc_output,
size_t buf_size_bytes,
size_t pkt_limit,
size_t block_port,
UHD_UNUSED(const uhd::sid_t &sid)
) {
UHD_RFNOC_BLOCK_TRACE() << "source_block_ctrl_base::configure_flow_control_out() buf_size_bytes==" << buf_size_bytes;
if (buf_size_bytes == 0) {
throw uhd::runtime_error(str(
boost::format("Invalid window size %d for block %s. Window size cannot be 0 bytes.")
% buf_size_bytes % unique_id()
));
}
//Disable flow control entirely and let all upstream data flush out
//We need to do this every time the window is changed because
//a) We don't know what state the flow-control module was left in
// in the previous run (it should still be enabled)
//b) Changing the window size where data is buffered upstream may
// result in stale packets entering the stream.
sr_write(SR_FLOW_CTRL_EN, 0, block_port);
//Wait for data to flush out.
//In the FPGA we are guaranteed that all buffered packets are more-or-less consecutive.
//1ms@200MHz = 200,000 cycles of "flush time".
//200k cycles = 200k * 8 bytes (64 bits) = 1.6MB of data that can be flushed.
//Typically in the FPGA we have buffering in the order of kilobytes so waiting for 1MB
//to flush is more than enough time.
//TODO: Enhancement. We should get feedback from the FPGA about when the source_flow_control
// module is done flushing.
std::this_thread::sleep_for(std::chrono::milliseconds(1));
//Enable source flow control module and conditionally enable byte based and/or packet count
//based flow control
const bool enable_byte_fc = (buf_size_bytes != 0);
const bool enable_pkt_cnt_fc = (pkt_limit != 0);
const size_t config = enable_fc_output + (enable_byte_fc << 1) + (enable_pkt_cnt_fc << 2);
//Resize the FC window.
//Precondition: No data can be buffered upstream.
if (enable_byte_fc) {
sr_write(SR_FLOW_CTRL_WINDOW_SIZE, buf_size_bytes, block_port);
}
if (enable_pkt_cnt_fc) {
sr_write(SR_FLOW_CTRL_PKT_LIMIT, pkt_limit, block_port);
}
//Enable the FC window.
//Precondition: The window size and/or packet limit must be set.
sr_write(SR_FLOW_CTRL_EN, config, block_port);
}
/***********************************************************************
* Hooks
**********************************************************************/
size_t source_block_ctrl_base::_request_output_port(
const size_t suggested_port,
const uhd::device_addr_t &
) const {
const std::set<size_t> valid_output_ports = utils::str_list_to_set<size_t>(_tree->list(_root_path / "ports" / "out"));
return utils::node_map_find_first_free(_downstream_nodes, suggested_port, valid_output_ports);
}
// vim: sw=4 et:
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