From 08233d44a6cfde878d7e10bca38ae935ed1c8fd5 Mon Sep 17 00:00:00 2001 From: Mauro Date: Wed, 30 Jun 2021 07:57:22 +0000 Subject: [HICN-713] Transport Library Major Refactoring 2 Co-authored-by: Luca Muscariello Co-authored-by: Michele Papalini Co-authored-by: Olivier Roques Co-authored-by: Giulio Grassi Signed-off-by: Mauro Sardara Change-Id: I5b2c667bad66feb45abdb5effe22ed0f6c85d1c2 --- libtransport/src/protocols/rtc_data_path.cc | 156 ---------------------------- 1 file changed, 156 deletions(-) delete mode 100644 libtransport/src/protocols/rtc_data_path.cc (limited to 'libtransport/src/protocols/rtc_data_path.cc') diff --git a/libtransport/src/protocols/rtc_data_path.cc b/libtransport/src/protocols/rtc_data_path.cc deleted file mode 100644 index 30644e939..000000000 --- a/libtransport/src/protocols/rtc_data_path.cc +++ /dev/null @@ -1,156 +0,0 @@ -/* - * Copyright (c) 2017-2019 Cisco and/or its affiliates. - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at: - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include - -#include -#include - -#define MAX_ROUNDS_WITHOUT_PKTS 10 // 2sec - -namespace transport { - -namespace protocol { - -RTCDataPath::RTCDataPath() - : min_rtt(UINT_MAX), - prev_min_rtt(UINT_MAX), - min_owd(INT_MAX), // this is computed like in LEDBAT, so it is not the - // real OWD, but the measured one, that depends on the - // clock of sender and receiver. the only meaningful - // value is is the queueing delay. for this reason we - // keep both RTT (for the windowd calculation) and OWD - // (for congestion/quality control) - prev_min_owd(INT_MAX), - avg_owd(0.0), - queuing_delay(DBL_MAX), - lastRecvSeq_(0), - lastRecvTime_(0), - avg_inter_arrival_(DBL_MAX), - received_nacks_(false), - received_packets_(false), - rounds_without_packets_(0), - RTThistory_(HISTORY_LEN), - OWDhistory_(HISTORY_LEN){}; - -void RTCDataPath::insertRttSample(uint64_t rtt) { - // for the rtt we only keep track of the min one - if (rtt < min_rtt) min_rtt = rtt; -} - -void RTCDataPath::insertOwdSample(int64_t owd) { - // for owd we use both min and avg - if (owd < min_owd) min_owd = owd; - - if (avg_owd != DBL_MAX) - avg_owd = (avg_owd * (1 - ALPHA_RTC)) + (owd * ALPHA_RTC); - else { - avg_owd = owd; - } - - // owd is computed only for valid data packets so we count only - // this for decide if we recevie traffic or not - received_packets_ = true; -} - -void RTCDataPath::computeInterArrivalGap(uint32_t segmentNumber) { - // got packet in sequence, compute gap - if (lastRecvSeq_ == (segmentNumber - 1)) { - uint64_t now = std::chrono::duration_cast( - std::chrono::steady_clock::now().time_since_epoch()) - .count(); - uint64_t delta = now - lastRecvTime_; - lastRecvSeq_ = segmentNumber; - lastRecvTime_ = now; - if (avg_inter_arrival_ == DBL_MAX) - avg_inter_arrival_ = delta; - else - avg_inter_arrival_ = - (avg_inter_arrival_ * (1 - ALPHA_RTC)) + (delta * ALPHA_RTC); - return; - } - - // ooo packet, update the stasts if needed - if (lastRecvSeq_ <= segmentNumber) { - lastRecvSeq_ = segmentNumber; - lastRecvTime_ = std::chrono::duration_cast( - std::chrono::steady_clock::now().time_since_epoch()) - .count(); - } -} - -void RTCDataPath::receivedNack() { received_nacks_ = true; } - -double RTCDataPath::getInterArrivalGap() { - if (avg_inter_arrival_ == DBL_MAX) return 0; - return avg_inter_arrival_; -} - -bool RTCDataPath::isActive() { - if (received_nacks_ && rounds_without_packets_ < MAX_ROUNDS_WITHOUT_PKTS) - return true; - return false; -} - -void RTCDataPath::roundEnd() { - // reset min_rtt and add it to the history - if (min_rtt != UINT_MAX) { - prev_min_rtt = min_rtt; - } else { - // this may happen if we do not receive any packet - // from this path in the last round. in this case - // we use the measure from the previuos round - min_rtt = prev_min_rtt; - } - - if (min_rtt == 0) min_rtt = 1; - - RTThistory_.pushBack(min_rtt); - min_rtt = UINT_MAX; - - // do the same for min owd - if (min_owd != INT_MAX) { - prev_min_owd = min_owd; - } else { - min_owd = prev_min_owd; - } - - if (min_owd != INT_MAX) { - OWDhistory_.pushBack(min_owd); - min_owd = INT_MAX; - - // compute queuing delay - queuing_delay = avg_owd - getMinOwd(); - - } else { - queuing_delay = 0.0; - } - - if (!received_packets_) - rounds_without_packets_++; - else - rounds_without_packets_ = 0; - received_packets_ = false; -} - -double RTCDataPath::getQueuingDealy() { return queuing_delay; } - -uint64_t RTCDataPath::getMinRtt() { return RTThistory_.begin(); } - -int64_t RTCDataPath::getMinOwd() { return OWDhistory_.begin(); } - -} // end namespace protocol - -} // end namespace transport -- cgit 1.2.3-korg