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//
// Copyright 2019 Ettus Research, a National Instruments Brand
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#include <uhdlib/rfnoc/chdr_rx_data_xport.hpp>
#include <uhdlib/rfnoc/chdr_types.hpp>
#include <uhdlib/rfnoc/mgmt_portal.hpp>
#include <uhdlib/rfnoc/rfnoc_common.hpp>
#include <uhdlib/transport/io_service.hpp>
#include <uhdlib/transport/link_if.hpp>
using namespace uhd;
using namespace uhd::rfnoc;
using namespace uhd::rfnoc::detail;
using namespace uhd::transport;
rx_flow_ctrl_sender::rx_flow_ctrl_sender(
const chdr::chdr_packet_factory& pkt_factory, const sep_id_pair_t sep_ids)
: _dst_epid(sep_ids.first)
{
_fc_packet = pkt_factory.make_strs();
_fc_strs_pyld.src_epid = sep_ids.second;
}
void rx_flow_ctrl_sender::set_capacity(const stream_buff_params_t& recv_capacity)
{
_fc_strs_pyld.capacity_bytes = recv_capacity.bytes;
_fc_strs_pyld.capacity_pkts = recv_capacity.packets;
}
chdr_rx_data_xport::chdr_rx_data_xport(uhd::transport::io_service::sptr io_srv,
uhd::transport::recv_link_if::sptr recv_link,
uhd::transport::send_link_if::sptr send_link,
const chdr::chdr_packet_factory& pkt_factory,
const uhd::rfnoc::sep_id_pair_t& epids,
const size_t num_recv_frames,
const fc_params_t& fc_params)
: _fc_state(epids, fc_params.freq)
, _fc_sender(pkt_factory, epids)
, _epid(epids.second)
{
UHD_LOG_TRACE("XPORT::RX_DATA_XPORT",
"Creating rx xport with local epid=" << epids.second
<< ", remote epid=" << epids.first);
_recv_packet = pkt_factory.make_generic();
_fc_sender.set_capacity(fc_params.buff_capacity);
// Calculate max payload size
const size_t pyld_offset =
_recv_packet->calculate_payload_offset(chdr::PKT_TYPE_DATA_WITH_TS);
_max_payload_size = recv_link->get_recv_frame_size() - pyld_offset;
// Make data transport
auto recv_cb =
[this](buff_t::uptr& buff, recv_link_if* recv_link, send_link_if* send_link) {
return this->_recv_callback(buff, recv_link, send_link);
};
auto fc_cb =
[this](buff_t::uptr buff, recv_link_if* recv_link, send_link_if* send_link) {
this->_fc_callback(std::move(buff), recv_link, send_link);
};
// Needs just a single send frame for responses
_recv_io = io_srv->make_recv_client(recv_link,
num_recv_frames,
recv_cb,
send_link,
/* num_send_frames*/ 1,
fc_cb);
UHD_LOG_TRACE("XPORT::RX_DATA_XPORT",
"Stream endpoint was configured with:"
<< std::endl
<< "capacity bytes=" << fc_params.buff_capacity.bytes
<< ", packets=" << fc_params.buff_capacity.packets << std::endl
<< "fc frequency bytes=" << fc_params.freq.bytes
<< ", packets=" << fc_params.freq.packets);
}
chdr_rx_data_xport::fc_params_t chdr_rx_data_xport::configure_sep(io_service::sptr io_srv,
recv_link_if::sptr recv_link,
send_link_if::sptr send_link,
const chdr::chdr_packet_factory& pkt_factory,
mgmt::mgmt_portal& mgmt_portal,
const sep_id_pair_t& epids,
const sw_buff_t pyld_buff_fmt,
const sw_buff_t mdata_buff_fmt,
const stream_buff_params_t& recv_capacity,
const stream_buff_params_t& fc_freq,
const stream_buff_params_t& fc_headroom,
const bool lossy_xport)
{
const sep_id_t remote_epid = epids.first;
const sep_id_t local_epid = epids.second;
rx_flow_ctrl_sender fc_sender(pkt_factory, epids);
chdr::chdr_packet::uptr pkt = pkt_factory.make_generic();
fc_sender.set_capacity(recv_capacity);
chdr::strc_payload strc;
auto recv_cb = [&pkt, local_epid, &strc](buff_t::uptr& buff,
recv_link_if* /*recv_link*/,
send_link_if* /*send_link*/) {
pkt->refresh(buff->data());
const auto header = pkt->get_chdr_header();
const auto dst_epid = header.get_dst_epid();
if (dst_epid != local_epid) {
return false;
}
const auto type = header.get_pkt_type();
if (type != chdr::PKT_TYPE_STRC) {
return false;
}
strc.deserialize(pkt->get_payload_const_ptr_as<uint64_t>(),
pkt->get_payload_size() / sizeof(uint64_t),
pkt->conv_to_host<uint64_t>());
if (strc.op_code != chdr::STRC_INIT) {
throw uhd::value_error("Unexpected opcode value in STRC packet.");
}
return true;
};
auto fc_cb = [&fc_sender](buff_t::uptr buff,
recv_link_if* recv_link,
send_link_if* send_link) {
recv_link->release_recv_buff(std::move(buff));
// Send a strs response to configure flow control on the sender. The
// byte and packet counts are not important since they are reset by
// the stream endpoint on receipt of this packet.
fc_sender.send_strs(send_link, {0, 0});
};
// Create a temporary recv_io to receive the strc init
auto recv_io = io_srv->make_recv_client(recv_link,
1, // num_recv_frames
recv_cb,
send_link,
1, // num_send_frames
fc_cb);
// Create a control transport with the rx data links to send mgmt packets
// needed to setup the stream
// Piggyback on frames from the recv_io_if
auto ctrl_xport = uhd::rfnoc::chdr_ctrl_xport::make(io_srv,
send_link,
recv_link,
pkt_factory,
local_epid,
1, // num_send_frames
1); // num_recv_frames
// Setup a route to the EPID
// Note that this may be gratuitous--The endpoint may already have been set up
mgmt_portal.setup_local_route(*ctrl_xport, remote_epid);
// Initialize flow control - first, the management portal sends a stream
// command containing its requested flow control frequency
mgmt_portal.config_local_rx_stream_start(*ctrl_xport,
remote_epid,
lossy_xport,
pyld_buff_fmt,
mdata_buff_fmt,
fc_freq,
fc_headroom);
// Now, release the buffer. In the flow control callback for the recv_io
// (fc_cb above), we send a stream status containing the xport buffer
// capacity.
auto buff = recv_io->get_recv_buff(100);
if (!buff) {
throw uhd::runtime_error(
"rx xport timed out getting a response from mgmt_portal");
}
recv_io->release_recv_buff(std::move(buff));
// Finally, let the management portal know the setup is complete
mgmt_portal.config_local_rx_stream_commit(*ctrl_xport, remote_epid);
// The flow control frequency requested is contained in the strc
UHD_LOG_TRACE("XPORT::RX_DATA_XPORT",
"Received strc init with fc freq"
<< " bytes=" << strc.num_bytes << ", packets=" << strc.num_pkts);
fc_params_t fc_params;
fc_params.buff_capacity = recv_capacity;
fc_params.freq = {strc.num_bytes, static_cast<uint32_t>(strc.num_pkts)};
recv_io.reset();
ctrl_xport.reset();
return fc_params;
}
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