2375 lines
69 KiB
C
2375 lines
69 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
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* Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* a) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* b) Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the distribution.
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*
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* c) Neither the name of Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <netinet/sctp_os.h>
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#include <netinet/sctp_var.h>
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#include <netinet/sctp_sysctl.h>
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#include <netinet/sctp_pcb.h>
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#include <netinet/sctp_header.h>
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#include <netinet/sctputil.h>
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#include <netinet/sctp_output.h>
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#include <netinet/sctp_input.h>
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#include <netinet/sctp_indata.h>
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#include <netinet/sctp_uio.h>
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#include <netinet/sctp_timer.h>
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#include <netinet/sctp_auth.h>
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#include <netinet/sctp_asconf.h>
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#include <netinet/sctp_kdtrace.h>
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#define SHIFT_MPTCP_MULTI_N 40
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#define SHIFT_MPTCP_MULTI_Z 16
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#define SHIFT_MPTCP_MULTI 8
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#ifdef KDTRACE_HOOOKS
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#define __dtrace
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#else
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#define __dtrace __unused
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#endif
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static void
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sctp_enforce_cwnd_limit(struct sctp_association *assoc, struct sctp_nets *net)
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{
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if ((assoc->max_cwnd > 0) &&
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(net->cwnd > assoc->max_cwnd) &&
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(net->cwnd > (net->mtu - sizeof(struct sctphdr)))) {
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net->cwnd = assoc->max_cwnd;
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if (net->cwnd < (net->mtu - sizeof(struct sctphdr))) {
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net->cwnd = net->mtu - sizeof(struct sctphdr);
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}
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}
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}
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static void
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sctp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net)
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{
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struct sctp_association *assoc;
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uint32_t cwnd_in_mtu;
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assoc = &stcb->asoc;
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cwnd_in_mtu = SCTP_BASE_SYSCTL(sctp_initial_cwnd);
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if (cwnd_in_mtu == 0) {
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/* Using 0 means that the value of RFC 4960 is used. */
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net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND));
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} else {
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/*
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* We take the minimum of the burst limit and the initial
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* congestion window.
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*/
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if ((assoc->max_burst > 0) && (cwnd_in_mtu > assoc->max_burst))
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cwnd_in_mtu = assoc->max_burst;
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net->cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu;
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}
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if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) ||
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(stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2)) {
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/* In case of resource pooling initialize appropriately */
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net->cwnd /= assoc->numnets;
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if (net->cwnd < (net->mtu - sizeof(struct sctphdr))) {
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net->cwnd = net->mtu - sizeof(struct sctphdr);
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}
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}
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sctp_enforce_cwnd_limit(assoc, net);
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net->ssthresh = assoc->peers_rwnd;
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SDT_PROBE5(sctp, cwnd, net, init,
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stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net,
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0, net->cwnd);
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if (SCTP_BASE_SYSCTL(sctp_logging_level) &
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(SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
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sctp_log_cwnd(stcb, net, 0, SCTP_CWND_INITIALIZATION);
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}
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}
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static void
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sctp_cwnd_update_after_fr(struct sctp_tcb *stcb,
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struct sctp_association *asoc)
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{
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struct sctp_nets *net;
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uint32_t t_ssthresh, t_cwnd;
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uint64_t t_ucwnd_sbw;
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/* MT FIXME: Don't compute this over and over again */
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t_ssthresh = 0;
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t_cwnd = 0;
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t_ucwnd_sbw = 0;
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if ((asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) ||
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(asoc->sctp_cmt_on_off == SCTP_CMT_RPV2)) {
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TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
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t_ssthresh += net->ssthresh;
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t_cwnd += net->cwnd;
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if (net->lastsa > 0) {
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t_ucwnd_sbw += (uint64_t)net->cwnd / (uint64_t)net->lastsa;
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}
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}
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if (t_ucwnd_sbw == 0) {
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t_ucwnd_sbw = 1;
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}
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}
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/*-
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* CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) &&
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* (net->fast_retran_loss_recovery == 0)))
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*/
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TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
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if ((asoc->fast_retran_loss_recovery == 0) ||
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(asoc->sctp_cmt_on_off > 0)) {
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/* out of a RFC2582 Fast recovery window? */
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if (net->net_ack > 0) {
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/*
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* per section 7.2.3, are there any
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* destinations that had a fast retransmit
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* to them. If so what we need to do is
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* adjust ssthresh and cwnd.
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*/
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struct sctp_tmit_chunk *lchk;
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int old_cwnd = net->cwnd;
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if ((asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) ||
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(asoc->sctp_cmt_on_off == SCTP_CMT_RPV2)) {
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if (asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) {
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net->ssthresh = (uint32_t)(((uint64_t)4 *
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(uint64_t)net->mtu *
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(uint64_t)net->ssthresh) /
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(uint64_t)t_ssthresh);
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}
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if (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2) {
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uint32_t srtt;
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srtt = net->lastsa;
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/*
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* lastsa>>3; we don't need
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* to devide ...
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*/
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if (srtt == 0) {
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srtt = 1;
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}
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/*
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* Short Version => Equal to
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* Contel Version MBe
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*/
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net->ssthresh = (uint32_t)(((uint64_t)4 *
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(uint64_t)net->mtu *
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(uint64_t)net->cwnd) /
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((uint64_t)srtt *
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t_ucwnd_sbw));
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/* INCREASE FACTOR */ ;
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}
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if ((net->cwnd > t_cwnd / 2) &&
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(net->ssthresh < net->cwnd - t_cwnd / 2)) {
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net->ssthresh = net->cwnd - t_cwnd / 2;
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}
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if (net->ssthresh < net->mtu) {
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net->ssthresh = net->mtu;
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}
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} else {
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net->ssthresh = net->cwnd / 2;
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if (net->ssthresh < (net->mtu * 2)) {
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net->ssthresh = 2 * net->mtu;
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}
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}
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net->cwnd = net->ssthresh;
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sctp_enforce_cwnd_limit(asoc, net);
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SDT_PROBE5(sctp, cwnd, net, fr,
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stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net,
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old_cwnd, net->cwnd);
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if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
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sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd),
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SCTP_CWND_LOG_FROM_FR);
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}
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lchk = TAILQ_FIRST(&asoc->send_queue);
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net->partial_bytes_acked = 0;
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/* Turn on fast recovery window */
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asoc->fast_retran_loss_recovery = 1;
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if (lchk == NULL) {
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/* Mark end of the window */
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asoc->fast_recovery_tsn = asoc->sending_seq - 1;
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} else {
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asoc->fast_recovery_tsn = lchk->rec.data.tsn - 1;
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}
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/*
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* CMT fast recovery -- per destination
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* recovery variable.
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*/
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net->fast_retran_loss_recovery = 1;
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if (lchk == NULL) {
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/* Mark end of the window */
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net->fast_recovery_tsn = asoc->sending_seq - 1;
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} else {
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net->fast_recovery_tsn = lchk->rec.data.tsn - 1;
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}
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sctp_timer_stop(SCTP_TIMER_TYPE_SEND,
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stcb->sctp_ep, stcb, net,
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SCTP_FROM_SCTP_CC_FUNCTIONS + SCTP_LOC_1);
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sctp_timer_start(SCTP_TIMER_TYPE_SEND,
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stcb->sctp_ep, stcb, net);
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}
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} else if (net->net_ack > 0) {
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/*
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* Mark a peg that we WOULD have done a cwnd
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* reduction but RFC2582 prevented this action.
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*/
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SCTP_STAT_INCR(sctps_fastretransinrtt);
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}
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}
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}
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/* Defines for instantaneous bw decisions */
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#define SCTP_INST_LOOSING 1 /* Losing to other flows */
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#define SCTP_INST_NEUTRAL 2 /* Neutral, no indication */
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#define SCTP_INST_GAINING 3 /* Gaining, step down possible */
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static int
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cc_bw_same(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw,
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uint64_t rtt_offset, uint64_t vtag, uint8_t inst_ind)
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{
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uint64_t oth __dtrace, probepoint __dtrace;
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probepoint = (((uint64_t)net->cwnd) << 32);
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if (net->rtt > net->cc_mod.rtcc.lbw_rtt + rtt_offset) {
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/*
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* rtt increased we don't update bw.. so we don't update the
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* rtt either.
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*/
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/* Probe point 5 */
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probepoint |= ((5 << 16) | 1);
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SDT_PROBE5(sctp, cwnd, net, rttvar,
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vtag,
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((net->cc_mod.rtcc.lbw << 32) | nbw),
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((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
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net->flight_size,
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probepoint);
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if ((net->cc_mod.rtcc.steady_step) && (inst_ind != SCTP_INST_LOOSING)) {
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if (net->cc_mod.rtcc.last_step_state == 5)
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net->cc_mod.rtcc.step_cnt++;
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else
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net->cc_mod.rtcc.step_cnt = 1;
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net->cc_mod.rtcc.last_step_state = 5;
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if ((net->cc_mod.rtcc.step_cnt == net->cc_mod.rtcc.steady_step) ||
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((net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step) &&
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((net->cc_mod.rtcc.step_cnt % net->cc_mod.rtcc.steady_step) == 0))) {
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/* Try a step down */
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oth = net->cc_mod.rtcc.vol_reduce;
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oth <<= 16;
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oth |= net->cc_mod.rtcc.step_cnt;
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oth <<= 16;
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oth |= net->cc_mod.rtcc.last_step_state;
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SDT_PROBE5(sctp, cwnd, net, rttstep,
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vtag,
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((net->cc_mod.rtcc.lbw << 32) | nbw),
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((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
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oth,
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probepoint);
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if (net->cwnd > (4 * net->mtu)) {
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net->cwnd -= net->mtu;
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net->cc_mod.rtcc.vol_reduce++;
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} else {
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net->cc_mod.rtcc.step_cnt = 0;
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}
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}
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}
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return (1);
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}
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if (net->rtt < net->cc_mod.rtcc.lbw_rtt - rtt_offset) {
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/*
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* rtt decreased, there could be more room. we update both
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* the bw and the rtt here to lock this in as a good step
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* down.
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*/
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/* Probe point 6 */
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probepoint |= ((6 << 16) | 0);
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SDT_PROBE5(sctp, cwnd, net, rttvar,
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vtag,
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((net->cc_mod.rtcc.lbw << 32) | nbw),
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((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
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net->flight_size,
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probepoint);
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if (net->cc_mod.rtcc.steady_step) {
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oth = net->cc_mod.rtcc.vol_reduce;
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oth <<= 16;
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oth |= net->cc_mod.rtcc.step_cnt;
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oth <<= 16;
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oth |= net->cc_mod.rtcc.last_step_state;
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SDT_PROBE5(sctp, cwnd, net, rttstep,
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vtag,
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((net->cc_mod.rtcc.lbw << 32) | nbw),
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((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
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oth,
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probepoint);
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if ((net->cc_mod.rtcc.last_step_state == 5) &&
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(net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step)) {
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/* Step down worked */
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net->cc_mod.rtcc.step_cnt = 0;
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return (1);
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} else {
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net->cc_mod.rtcc.last_step_state = 6;
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net->cc_mod.rtcc.step_cnt = 0;
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}
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}
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net->cc_mod.rtcc.lbw = nbw;
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net->cc_mod.rtcc.lbw_rtt = net->rtt;
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net->cc_mod.rtcc.cwnd_at_bw_set = net->cwnd;
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if (inst_ind == SCTP_INST_GAINING)
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return (1);
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else if (inst_ind == SCTP_INST_NEUTRAL)
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return (1);
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else
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return (0);
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}
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/*
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* Ok bw and rtt remained the same .. no update to any
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*/
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/* Probe point 7 */
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probepoint |= ((7 << 16) | net->cc_mod.rtcc.ret_from_eq);
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SDT_PROBE5(sctp, cwnd, net, rttvar,
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vtag,
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((net->cc_mod.rtcc.lbw << 32) | nbw),
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((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
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net->flight_size,
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probepoint);
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if ((net->cc_mod.rtcc.steady_step) && (inst_ind != SCTP_INST_LOOSING)) {
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if (net->cc_mod.rtcc.last_step_state == 5)
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net->cc_mod.rtcc.step_cnt++;
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else
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net->cc_mod.rtcc.step_cnt = 1;
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net->cc_mod.rtcc.last_step_state = 5;
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if ((net->cc_mod.rtcc.step_cnt == net->cc_mod.rtcc.steady_step) ||
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((net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step) &&
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((net->cc_mod.rtcc.step_cnt % net->cc_mod.rtcc.steady_step) == 0))) {
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/* Try a step down */
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if (net->cwnd > (4 * net->mtu)) {
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net->cwnd -= net->mtu;
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net->cc_mod.rtcc.vol_reduce++;
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return (1);
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} else {
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net->cc_mod.rtcc.step_cnt = 0;
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}
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}
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}
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if (inst_ind == SCTP_INST_GAINING)
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return (1);
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else if (inst_ind == SCTP_INST_NEUTRAL)
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return (1);
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else
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return ((int)net->cc_mod.rtcc.ret_from_eq);
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}
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static int
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cc_bw_decrease(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw, uint64_t rtt_offset,
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uint64_t vtag, uint8_t inst_ind)
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{
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uint64_t oth __dtrace, probepoint __dtrace;
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/* Bandwidth decreased. */
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probepoint = (((uint64_t)net->cwnd) << 32);
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if (net->rtt > net->cc_mod.rtcc.lbw_rtt + rtt_offset) {
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/* rtt increased */
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/* Did we add more */
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if ((net->cwnd > net->cc_mod.rtcc.cwnd_at_bw_set) &&
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(inst_ind != SCTP_INST_LOOSING)) {
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/* We caused it maybe.. back off? */
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/* PROBE POINT 1 */
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probepoint |= ((1 << 16) | 1);
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SDT_PROBE5(sctp, cwnd, net, rttvar,
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vtag,
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((net->cc_mod.rtcc.lbw << 32) | nbw),
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((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
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net->flight_size,
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probepoint);
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if (net->cc_mod.rtcc.ret_from_eq) {
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/*
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* Switch over to CA if we are less
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* aggressive
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*/
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net->ssthresh = net->cwnd - 1;
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|
net->partial_bytes_acked = 0;
|
|
}
|
|
return (1);
|
|
}
|
|
/* Probe point 2 */
|
|
probepoint |= ((2 << 16) | 0);
|
|
SDT_PROBE5(sctp, cwnd, net, rttvar,
|
|
vtag,
|
|
((net->cc_mod.rtcc.lbw << 32) | nbw),
|
|
((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
|
|
net->flight_size,
|
|
probepoint);
|
|
/* Someone else - fight for more? */
|
|
if (net->cc_mod.rtcc.steady_step) {
|
|
oth = net->cc_mod.rtcc.vol_reduce;
|
|
oth <<= 16;
|
|
oth |= net->cc_mod.rtcc.step_cnt;
|
|
oth <<= 16;
|
|
oth |= net->cc_mod.rtcc.last_step_state;
|
|
SDT_PROBE5(sctp, cwnd, net, rttstep,
|
|
vtag,
|
|
((net->cc_mod.rtcc.lbw << 32) | nbw),
|
|
((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
|
|
oth,
|
|
probepoint);
|
|
/*
|
|
* Did we voluntarily give up some? if so take one
|
|
* back please
|
|
*/
|
|
if ((net->cc_mod.rtcc.vol_reduce) &&
|
|
(inst_ind != SCTP_INST_GAINING)) {
|
|
net->cwnd += net->mtu;
|
|
sctp_enforce_cwnd_limit(&stcb->asoc, net);
|
|
net->cc_mod.rtcc.vol_reduce--;
|
|
}
|
|
net->cc_mod.rtcc.last_step_state = 2;
|
|
net->cc_mod.rtcc.step_cnt = 0;
|
|
}
|
|
goto out_decision;
|
|
} else if (net->rtt < net->cc_mod.rtcc.lbw_rtt - rtt_offset) {
|
|
/* bw & rtt decreased */
|
|
/* Probe point 3 */
|
|
probepoint |= ((3 << 16) | 0);
|
|
SDT_PROBE5(sctp, cwnd, net, rttvar,
|
|
vtag,
|
|
((net->cc_mod.rtcc.lbw << 32) | nbw),
|
|
((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
|
|
net->flight_size,
|
|
probepoint);
|
|
if (net->cc_mod.rtcc.steady_step) {
|
|
oth = net->cc_mod.rtcc.vol_reduce;
|
|
oth <<= 16;
|
|
oth |= net->cc_mod.rtcc.step_cnt;
|
|
oth <<= 16;
|
|
oth |= net->cc_mod.rtcc.last_step_state;
|
|
SDT_PROBE5(sctp, cwnd, net, rttstep,
|
|
vtag,
|
|
((net->cc_mod.rtcc.lbw << 32) | nbw),
|
|
((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
|
|
oth,
|
|
probepoint);
|
|
if ((net->cc_mod.rtcc.vol_reduce) &&
|
|
(inst_ind != SCTP_INST_GAINING)) {
|
|
net->cwnd += net->mtu;
|
|
sctp_enforce_cwnd_limit(&stcb->asoc, net);
|
|
net->cc_mod.rtcc.vol_reduce--;
|
|
}
|
|
net->cc_mod.rtcc.last_step_state = 3;
|
|
net->cc_mod.rtcc.step_cnt = 0;
|
|
}
|
|
goto out_decision;
|
|
}
|
|
/* The bw decreased but rtt stayed the same */
|
|
/* Probe point 4 */
|
|
probepoint |= ((4 << 16) | 0);
|
|
SDT_PROBE5(sctp, cwnd, net, rttvar,
|
|
vtag,
|
|
((net->cc_mod.rtcc.lbw << 32) | nbw),
|
|
((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
|
|
net->flight_size,
|
|
probepoint);
|
|
if (net->cc_mod.rtcc.steady_step) {
|
|
oth = net->cc_mod.rtcc.vol_reduce;
|
|
oth <<= 16;
|
|
oth |= net->cc_mod.rtcc.step_cnt;
|
|
oth <<= 16;
|
|
oth |= net->cc_mod.rtcc.last_step_state;
|
|
SDT_PROBE5(sctp, cwnd, net, rttstep,
|
|
vtag,
|
|
((net->cc_mod.rtcc.lbw << 32) | nbw),
|
|
((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
|
|
oth,
|
|
probepoint);
|
|
if ((net->cc_mod.rtcc.vol_reduce) &&
|
|
(inst_ind != SCTP_INST_GAINING)) {
|
|
net->cwnd += net->mtu;
|
|
sctp_enforce_cwnd_limit(&stcb->asoc, net);
|
|
net->cc_mod.rtcc.vol_reduce--;
|
|
}
|
|
net->cc_mod.rtcc.last_step_state = 4;
|
|
net->cc_mod.rtcc.step_cnt = 0;
|
|
}
|
|
out_decision:
|
|
net->cc_mod.rtcc.lbw = nbw;
|
|
net->cc_mod.rtcc.lbw_rtt = net->rtt;
|
|
net->cc_mod.rtcc.cwnd_at_bw_set = net->cwnd;
|
|
if (inst_ind == SCTP_INST_GAINING) {
|
|
return (1);
|
|
} else {
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
static int
|
|
cc_bw_increase(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw, uint64_t vtag)
|
|
{
|
|
uint64_t oth __dtrace, probepoint __dtrace;
|
|
|
|
/*
|
|
* BW increased, so update and return 0, since all actions in our
|
|
* table say to do the normal CC update. Note that we pay no
|
|
* attention to the inst_ind since our overall sum is increasing.
|
|
*/
|
|
/* PROBE POINT 0 */
|
|
probepoint = (((uint64_t)net->cwnd) << 32);
|
|
SDT_PROBE5(sctp, cwnd, net, rttvar,
|
|
vtag,
|
|
((net->cc_mod.rtcc.lbw << 32) | nbw),
|
|
((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
|
|
net->flight_size,
|
|
probepoint);
|
|
if (net->cc_mod.rtcc.steady_step) {
|
|
oth = net->cc_mod.rtcc.vol_reduce;
|
|
oth <<= 16;
|
|
oth |= net->cc_mod.rtcc.step_cnt;
|
|
oth <<= 16;
|
|
oth |= net->cc_mod.rtcc.last_step_state;
|
|
SDT_PROBE5(sctp, cwnd, net, rttstep,
|
|
vtag,
|
|
((net->cc_mod.rtcc.lbw << 32) | nbw),
|
|
((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
|
|
oth,
|
|
probepoint);
|
|
net->cc_mod.rtcc.last_step_state = 0;
|
|
net->cc_mod.rtcc.step_cnt = 0;
|
|
net->cc_mod.rtcc.vol_reduce = 0;
|
|
}
|
|
net->cc_mod.rtcc.lbw = nbw;
|
|
net->cc_mod.rtcc.lbw_rtt = net->rtt;
|
|
net->cc_mod.rtcc.cwnd_at_bw_set = net->cwnd;
|
|
return (0);
|
|
}
|
|
|
|
/* RTCC Algorithm to limit growth of cwnd, return
|
|
* true if you want to NOT allow cwnd growth
|
|
*/
|
|
static int
|
|
cc_bw_limit(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw)
|
|
{
|
|
uint64_t bw_offset, rtt_offset;
|
|
uint64_t probepoint __dtrace, rtt, vtag;
|
|
uint64_t bytes_for_this_rtt, inst_bw;
|
|
uint64_t div, inst_off;
|
|
int bw_shift;
|
|
uint8_t inst_ind;
|
|
int ret;
|
|
|
|
/*-
|
|
* Here we need to see if we want
|
|
* to limit cwnd growth due to increase
|
|
* in overall rtt but no increase in bw.
|
|
* We use the following table to figure
|
|
* out what we should do. When we return
|
|
* 0, cc update goes on as planned. If we
|
|
* return 1, then no cc update happens and cwnd
|
|
* stays where it is at.
|
|
* ----------------------------------
|
|
* BW | RTT | Action
|
|
* *********************************
|
|
* INC | INC | return 0
|
|
* ----------------------------------
|
|
* INC | SAME | return 0
|
|
* ----------------------------------
|
|
* INC | DECR | return 0
|
|
* ----------------------------------
|
|
* SAME | INC | return 1
|
|
* ----------------------------------
|
|
* SAME | SAME | return 1
|
|
* ----------------------------------
|
|
* SAME | DECR | return 0
|
|
* ----------------------------------
|
|
* DECR | INC | return 0 or 1 based on if we caused.
|
|
* ----------------------------------
|
|
* DECR | SAME | return 0
|
|
* ----------------------------------
|
|
* DECR | DECR | return 0
|
|
* ----------------------------------
|
|
*
|
|
* We are a bit fuzz on what an increase or
|
|
* decrease is. For BW it is the same if
|
|
* it did not change within 1/64th. For
|
|
* RTT it stayed the same if it did not
|
|
* change within 1/32nd
|
|
*/
|
|
bw_shift = SCTP_BASE_SYSCTL(sctp_rttvar_bw);
|
|
rtt = stcb->asoc.my_vtag;
|
|
vtag = (rtt << 32) | (((uint32_t)(stcb->sctp_ep->sctp_lport)) << 16) | (stcb->rport);
|
|
probepoint = (((uint64_t)net->cwnd) << 32);
|
|
rtt = net->rtt;
|
|
if (net->cc_mod.rtcc.rtt_set_this_sack) {
|
|
net->cc_mod.rtcc.rtt_set_this_sack = 0;
|
|
bytes_for_this_rtt = net->cc_mod.rtcc.bw_bytes - net->cc_mod.rtcc.bw_bytes_at_last_rttc;
|
|
net->cc_mod.rtcc.bw_bytes_at_last_rttc = net->cc_mod.rtcc.bw_bytes;
|
|
if (net->rtt) {
|
|
div = net->rtt / 1000;
|
|
if (div) {
|
|
inst_bw = bytes_for_this_rtt / div;
|
|
inst_off = inst_bw >> bw_shift;
|
|
if (inst_bw > nbw)
|
|
inst_ind = SCTP_INST_GAINING;
|
|
else if ((inst_bw + inst_off) < nbw)
|
|
inst_ind = SCTP_INST_LOOSING;
|
|
else
|
|
inst_ind = SCTP_INST_NEUTRAL;
|
|
probepoint |= ((0xb << 16) | inst_ind);
|
|
} else {
|
|
inst_ind = net->cc_mod.rtcc.last_inst_ind;
|
|
inst_bw = bytes_for_this_rtt / (uint64_t)(net->rtt);
|
|
/* Can't determine do not change */
|
|
probepoint |= ((0xc << 16) | inst_ind);
|
|
}
|
|
} else {
|
|
inst_ind = net->cc_mod.rtcc.last_inst_ind;
|
|
inst_bw = bytes_for_this_rtt;
|
|
/* Can't determine do not change */
|
|
probepoint |= ((0xd << 16) | inst_ind);
|
|
}
|
|
SDT_PROBE5(sctp, cwnd, net, rttvar,
|
|
vtag,
|
|
((nbw << 32) | inst_bw),
|
|
((net->cc_mod.rtcc.lbw_rtt << 32) | rtt),
|
|
net->flight_size,
|
|
probepoint);
|
|
} else {
|
|
/* No rtt measurement, use last one */
|
|
inst_ind = net->cc_mod.rtcc.last_inst_ind;
|
|
}
|
|
bw_offset = net->cc_mod.rtcc.lbw >> bw_shift;
|
|
if (nbw > net->cc_mod.rtcc.lbw + bw_offset) {
|
|
ret = cc_bw_increase(stcb, net, nbw, vtag);
|
|
goto out;
|
|
}
|
|
rtt_offset = net->cc_mod.rtcc.lbw_rtt >> SCTP_BASE_SYSCTL(sctp_rttvar_rtt);
|
|
if (nbw < net->cc_mod.rtcc.lbw - bw_offset) {
|
|
ret = cc_bw_decrease(stcb, net, nbw, rtt_offset, vtag, inst_ind);
|
|
goto out;
|
|
}
|
|
/*
|
|
* If we reach here then we are in a situation where the bw stayed
|
|
* the same.
|
|
*/
|
|
ret = cc_bw_same(stcb, net, nbw, rtt_offset, vtag, inst_ind);
|
|
out:
|
|
net->cc_mod.rtcc.last_inst_ind = inst_ind;
|
|
return (ret);
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_update_after_sack_common(struct sctp_tcb *stcb,
|
|
struct sctp_association *asoc,
|
|
int accum_moved, int reneged_all SCTP_UNUSED, int will_exit, int use_rtcc)
|
|
{
|
|
struct sctp_nets *net;
|
|
int old_cwnd __dtrace;
|
|
uint32_t t_ssthresh, incr;
|
|
uint64_t t_ucwnd_sbw;
|
|
uint64_t t_path_mptcp;
|
|
uint64_t mptcp_like_alpha;
|
|
uint32_t srtt;
|
|
uint64_t max_path;
|
|
|
|
/* MT FIXME: Don't compute this over and over again */
|
|
t_ssthresh = 0;
|
|
t_ucwnd_sbw = 0;
|
|
t_path_mptcp = 0;
|
|
mptcp_like_alpha = 1;
|
|
if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) ||
|
|
(stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2) ||
|
|
(stcb->asoc.sctp_cmt_on_off == SCTP_CMT_MPTCP)) {
|
|
max_path = 0;
|
|
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
|
|
t_ssthresh += net->ssthresh;
|
|
/* lastsa>>3; we don't need to devide ... */
|
|
srtt = net->lastsa;
|
|
if (srtt > 0) {
|
|
uint64_t tmp;
|
|
|
|
t_ucwnd_sbw += (uint64_t)net->cwnd / (uint64_t)srtt;
|
|
t_path_mptcp += (((uint64_t)net->cwnd) << SHIFT_MPTCP_MULTI_Z) /
|
|
(((uint64_t)net->mtu) * (uint64_t)srtt);
|
|
tmp = (((uint64_t)net->cwnd) << SHIFT_MPTCP_MULTI_N) /
|
|
((uint64_t)net->mtu * (uint64_t)(srtt * srtt));
|
|
if (tmp > max_path) {
|
|
max_path = tmp;
|
|
}
|
|
}
|
|
}
|
|
if (t_path_mptcp > 0) {
|
|
mptcp_like_alpha = max_path / (t_path_mptcp * t_path_mptcp);
|
|
} else {
|
|
mptcp_like_alpha = 1;
|
|
}
|
|
}
|
|
if (t_ssthresh == 0) {
|
|
t_ssthresh = 1;
|
|
}
|
|
if (t_ucwnd_sbw == 0) {
|
|
t_ucwnd_sbw = 1;
|
|
}
|
|
/******************************/
|
|
/* update cwnd and Early FR */
|
|
/******************************/
|
|
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
|
|
#ifdef JANA_CMT_FAST_RECOVERY
|
|
/*
|
|
* CMT fast recovery code. Need to debug.
|
|
*/
|
|
if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) {
|
|
if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) ||
|
|
SCTP_TSN_GE(net->pseudo_cumack, net->fast_recovery_tsn)) {
|
|
net->will_exit_fast_recovery = 1;
|
|
}
|
|
}
|
|
#endif
|
|
/* if nothing was acked on this destination skip it */
|
|
if (net->net_ack == 0) {
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK);
|
|
}
|
|
continue;
|
|
}
|
|
#ifdef JANA_CMT_FAST_RECOVERY
|
|
/*
|
|
* CMT fast recovery code
|
|
*/
|
|
/*
|
|
* if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery
|
|
* && net->will_exit_fast_recovery == 0) { @@@ Do something
|
|
* } else if (sctp_cmt_on_off == 0 &&
|
|
* asoc->fast_retran_loss_recovery && will_exit == 0) {
|
|
*/
|
|
#endif
|
|
|
|
if (asoc->fast_retran_loss_recovery &&
|
|
(will_exit == 0) &&
|
|
(asoc->sctp_cmt_on_off == 0)) {
|
|
/*
|
|
* If we are in loss recovery we skip any cwnd
|
|
* update
|
|
*/
|
|
return;
|
|
}
|
|
/*
|
|
* Did any measurements go on for this network?
|
|
*/
|
|
if (use_rtcc && (net->cc_mod.rtcc.tls_needs_set > 0)) {
|
|
uint64_t nbw;
|
|
|
|
/*
|
|
* At this point our bw_bytes has been updated by
|
|
* incoming sack information.
|
|
*
|
|
* But our bw may not yet be set.
|
|
*
|
|
*/
|
|
if ((net->cc_mod.rtcc.new_tot_time / 1000) > 0) {
|
|
nbw = net->cc_mod.rtcc.bw_bytes / (net->cc_mod.rtcc.new_tot_time / 1000);
|
|
} else {
|
|
nbw = net->cc_mod.rtcc.bw_bytes;
|
|
}
|
|
if (net->cc_mod.rtcc.lbw) {
|
|
if (cc_bw_limit(stcb, net, nbw)) {
|
|
/* Hold here, no update */
|
|
continue;
|
|
}
|
|
} else {
|
|
uint64_t vtag __dtrace, probepoint __dtrace;
|
|
|
|
probepoint = (((uint64_t)net->cwnd) << 32);
|
|
probepoint |= ((0xa << 16) | 0);
|
|
vtag = (net->rtt << 32) |
|
|
(((uint32_t)(stcb->sctp_ep->sctp_lport)) << 16) |
|
|
(stcb->rport);
|
|
|
|
SDT_PROBE5(sctp, cwnd, net, rttvar,
|
|
vtag,
|
|
nbw,
|
|
((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
|
|
net->flight_size,
|
|
probepoint);
|
|
net->cc_mod.rtcc.lbw = nbw;
|
|
net->cc_mod.rtcc.lbw_rtt = net->rtt;
|
|
if (net->cc_mod.rtcc.rtt_set_this_sack) {
|
|
net->cc_mod.rtcc.rtt_set_this_sack = 0;
|
|
net->cc_mod.rtcc.bw_bytes_at_last_rttc = net->cc_mod.rtcc.bw_bytes;
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* CMT: CUC algorithm. Update cwnd if pseudo-cumack has
|
|
* moved.
|
|
*/
|
|
if (accum_moved ||
|
|
((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) {
|
|
/* If the cumulative ack moved we can proceed */
|
|
if (net->cwnd <= net->ssthresh) {
|
|
/* We are in slow start */
|
|
if (net->flight_size + net->net_ack >= net->cwnd) {
|
|
uint32_t limit;
|
|
|
|
old_cwnd = net->cwnd;
|
|
switch (asoc->sctp_cmt_on_off) {
|
|
case SCTP_CMT_RPV1:
|
|
limit = (uint32_t)(((uint64_t)net->mtu *
|
|
(uint64_t)SCTP_BASE_SYSCTL(sctp_L2_abc_variable) *
|
|
(uint64_t)net->ssthresh) /
|
|
(uint64_t)t_ssthresh);
|
|
incr = (uint32_t)(((uint64_t)net->net_ack *
|
|
(uint64_t)net->ssthresh) /
|
|
(uint64_t)t_ssthresh);
|
|
if (incr > limit) {
|
|
incr = limit;
|
|
}
|
|
if (incr == 0) {
|
|
incr = 1;
|
|
}
|
|
break;
|
|
case SCTP_CMT_RPV2:
|
|
/*
|
|
* lastsa>>3; we don't need
|
|
* to divide ...
|
|
*/
|
|
srtt = net->lastsa;
|
|
if (srtt == 0) {
|
|
srtt = 1;
|
|
}
|
|
limit = (uint32_t)(((uint64_t)net->mtu *
|
|
(uint64_t)SCTP_BASE_SYSCTL(sctp_L2_abc_variable) *
|
|
(uint64_t)net->cwnd) /
|
|
((uint64_t)srtt * t_ucwnd_sbw));
|
|
/* INCREASE FACTOR */
|
|
incr = (uint32_t)(((uint64_t)net->net_ack *
|
|
(uint64_t)net->cwnd) /
|
|
((uint64_t)srtt * t_ucwnd_sbw));
|
|
/* INCREASE FACTOR */
|
|
if (incr > limit) {
|
|
incr = limit;
|
|
}
|
|
if (incr == 0) {
|
|
incr = 1;
|
|
}
|
|
break;
|
|
case SCTP_CMT_MPTCP:
|
|
limit = (uint32_t)(((uint64_t)net->mtu *
|
|
mptcp_like_alpha *
|
|
(uint64_t)SCTP_BASE_SYSCTL(sctp_L2_abc_variable)) >>
|
|
SHIFT_MPTCP_MULTI);
|
|
incr = (uint32_t)(((uint64_t)net->net_ack *
|
|
mptcp_like_alpha) >>
|
|
SHIFT_MPTCP_MULTI);
|
|
if (incr > limit) {
|
|
incr = limit;
|
|
}
|
|
if (incr > net->net_ack) {
|
|
incr = net->net_ack;
|
|
}
|
|
if (incr > net->mtu) {
|
|
incr = net->mtu;
|
|
}
|
|
break;
|
|
default:
|
|
incr = net->net_ack;
|
|
if (incr > net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable)) {
|
|
incr = net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable);
|
|
}
|
|
break;
|
|
}
|
|
net->cwnd += incr;
|
|
sctp_enforce_cwnd_limit(asoc, net);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, incr,
|
|
SCTP_CWND_LOG_FROM_SS);
|
|
}
|
|
SDT_PROBE5(sctp, cwnd, net, ack,
|
|
stcb->asoc.my_vtag,
|
|
((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
|
|
net,
|
|
old_cwnd, net->cwnd);
|
|
} else {
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->net_ack,
|
|
SCTP_CWND_LOG_NOADV_SS);
|
|
}
|
|
}
|
|
} else {
|
|
/* We are in congestion avoidance */
|
|
/*
|
|
* Add to pba
|
|
*/
|
|
net->partial_bytes_acked += net->net_ack;
|
|
|
|
if ((net->flight_size + net->net_ack >= net->cwnd) &&
|
|
(net->partial_bytes_acked >= net->cwnd)) {
|
|
net->partial_bytes_acked -= net->cwnd;
|
|
old_cwnd = net->cwnd;
|
|
switch (asoc->sctp_cmt_on_off) {
|
|
case SCTP_CMT_RPV1:
|
|
incr = (uint32_t)(((uint64_t)net->mtu *
|
|
(uint64_t)net->ssthresh) /
|
|
(uint64_t)t_ssthresh);
|
|
if (incr == 0) {
|
|
incr = 1;
|
|
}
|
|
break;
|
|
case SCTP_CMT_RPV2:
|
|
/*
|
|
* lastsa>>3; we don't need
|
|
* to divide ...
|
|
*/
|
|
srtt = net->lastsa;
|
|
if (srtt == 0) {
|
|
srtt = 1;
|
|
}
|
|
incr = (uint32_t)((uint64_t)net->mtu *
|
|
(uint64_t)net->cwnd /
|
|
((uint64_t)srtt *
|
|
t_ucwnd_sbw));
|
|
/* INCREASE FACTOR */
|
|
if (incr == 0) {
|
|
incr = 1;
|
|
}
|
|
break;
|
|
case SCTP_CMT_MPTCP:
|
|
incr = (uint32_t)((mptcp_like_alpha *
|
|
(uint64_t)net->cwnd) >>
|
|
SHIFT_MPTCP_MULTI);
|
|
if (incr > net->mtu) {
|
|
incr = net->mtu;
|
|
}
|
|
break;
|
|
default:
|
|
incr = net->mtu;
|
|
break;
|
|
}
|
|
net->cwnd += incr;
|
|
sctp_enforce_cwnd_limit(asoc, net);
|
|
SDT_PROBE5(sctp, cwnd, net, ack,
|
|
stcb->asoc.my_vtag,
|
|
((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
|
|
net,
|
|
old_cwnd, net->cwnd);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->mtu,
|
|
SCTP_CWND_LOG_FROM_CA);
|
|
}
|
|
} else {
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->net_ack,
|
|
SCTP_CWND_LOG_NOADV_CA);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->mtu,
|
|
SCTP_CWND_LOG_NO_CUMACK);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_update_exit_pf_common(struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
int old_cwnd __dtrace;
|
|
|
|
old_cwnd = net->cwnd;
|
|
net->cwnd = net->mtu;
|
|
SDT_PROBE5(sctp, cwnd, net, ack,
|
|
stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net,
|
|
old_cwnd, net->cwnd);
|
|
SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n",
|
|
(void *)net, net->cwnd);
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_update_after_timeout(struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
int old_cwnd = net->cwnd;
|
|
uint32_t t_ssthresh, t_cwnd;
|
|
uint64_t t_ucwnd_sbw;
|
|
|
|
/* MT FIXME: Don't compute this over and over again */
|
|
t_ssthresh = 0;
|
|
t_cwnd = 0;
|
|
if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) ||
|
|
(stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2)) {
|
|
struct sctp_nets *lnet;
|
|
uint32_t srtt;
|
|
|
|
t_ucwnd_sbw = 0;
|
|
TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
|
|
t_ssthresh += lnet->ssthresh;
|
|
t_cwnd += lnet->cwnd;
|
|
srtt = lnet->lastsa;
|
|
/* lastsa>>3; we don't need to divide ... */
|
|
if (srtt > 0) {
|
|
t_ucwnd_sbw += (uint64_t)lnet->cwnd / (uint64_t)srtt;
|
|
}
|
|
}
|
|
if (t_ssthresh < 1) {
|
|
t_ssthresh = 1;
|
|
}
|
|
if (t_ucwnd_sbw < 1) {
|
|
t_ucwnd_sbw = 1;
|
|
}
|
|
if (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) {
|
|
net->ssthresh = (uint32_t)(((uint64_t)4 *
|
|
(uint64_t)net->mtu *
|
|
(uint64_t)net->ssthresh) /
|
|
(uint64_t)t_ssthresh);
|
|
} else {
|
|
uint64_t cc_delta;
|
|
|
|
srtt = net->lastsa;
|
|
/* lastsa>>3; we don't need to divide ... */
|
|
if (srtt == 0) {
|
|
srtt = 1;
|
|
}
|
|
cc_delta = t_ucwnd_sbw * (uint64_t)srtt / 2;
|
|
if (cc_delta < t_cwnd) {
|
|
net->ssthresh = (uint32_t)((uint64_t)t_cwnd - cc_delta);
|
|
} else {
|
|
net->ssthresh = net->mtu;
|
|
}
|
|
}
|
|
if ((net->cwnd > t_cwnd / 2) &&
|
|
(net->ssthresh < net->cwnd - t_cwnd / 2)) {
|
|
net->ssthresh = net->cwnd - t_cwnd / 2;
|
|
}
|
|
if (net->ssthresh < net->mtu) {
|
|
net->ssthresh = net->mtu;
|
|
}
|
|
} else {
|
|
net->ssthresh = max(net->cwnd / 2, 4 * net->mtu);
|
|
}
|
|
net->cwnd = net->mtu;
|
|
net->partial_bytes_acked = 0;
|
|
SDT_PROBE5(sctp, cwnd, net, to,
|
|
stcb->asoc.my_vtag,
|
|
((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
|
|
net,
|
|
old_cwnd, net->cwnd);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX);
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_update_after_ecn_echo_common(struct sctp_tcb *stcb, struct sctp_nets *net,
|
|
int in_window, int num_pkt_lost, int use_rtcc)
|
|
{
|
|
int old_cwnd = net->cwnd;
|
|
|
|
if ((use_rtcc) && (net->lan_type == SCTP_LAN_LOCAL) && (net->cc_mod.rtcc.use_dccc_ecn)) {
|
|
/* Data center Congestion Control */
|
|
if (in_window == 0) {
|
|
/*
|
|
* Go to CA with the cwnd at the point we sent the
|
|
* TSN that was marked with a CE.
|
|
*/
|
|
if (net->ecn_prev_cwnd < net->cwnd) {
|
|
/* Restore to prev cwnd */
|
|
net->cwnd = net->ecn_prev_cwnd - (net->mtu * num_pkt_lost);
|
|
} else {
|
|
/* Just cut in 1/2 */
|
|
net->cwnd /= 2;
|
|
}
|
|
/* Drop to CA */
|
|
net->ssthresh = net->cwnd - (num_pkt_lost * net->mtu);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT);
|
|
}
|
|
} else {
|
|
/*
|
|
* Further tuning down required over the drastic
|
|
* original cut
|
|
*/
|
|
net->ssthresh -= (net->mtu * num_pkt_lost);
|
|
net->cwnd -= (net->mtu * num_pkt_lost);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT);
|
|
}
|
|
}
|
|
SCTP_STAT_INCR(sctps_ecnereducedcwnd);
|
|
} else {
|
|
if (in_window == 0) {
|
|
SCTP_STAT_INCR(sctps_ecnereducedcwnd);
|
|
net->ssthresh = net->cwnd / 2;
|
|
if (net->ssthresh < net->mtu) {
|
|
net->ssthresh = net->mtu;
|
|
/*
|
|
* here back off the timer as well, to slow
|
|
* us down
|
|
*/
|
|
net->RTO <<= 1;
|
|
}
|
|
net->cwnd = net->ssthresh;
|
|
SDT_PROBE5(sctp, cwnd, net, ecn,
|
|
stcb->asoc.my_vtag,
|
|
((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
|
|
net,
|
|
old_cwnd, net->cwnd);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT);
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_update_after_packet_dropped(struct sctp_tcb *stcb,
|
|
struct sctp_nets *net, struct sctp_pktdrop_chunk *cp,
|
|
uint32_t *bottle_bw, uint32_t *on_queue)
|
|
{
|
|
uint32_t bw_avail;
|
|
unsigned int incr;
|
|
int old_cwnd = net->cwnd;
|
|
|
|
/* get bottle neck bw */
|
|
*bottle_bw = ntohl(cp->bottle_bw);
|
|
/* and whats on queue */
|
|
*on_queue = ntohl(cp->current_onq);
|
|
/*
|
|
* adjust the on-queue if our flight is more it could be that the
|
|
* router has not yet gotten data "in-flight" to it
|
|
*/
|
|
if (*on_queue < net->flight_size) {
|
|
*on_queue = net->flight_size;
|
|
}
|
|
/* rtt is measured in micro seconds, bottle_bw in bytes per second */
|
|
bw_avail = (uint32_t)(((uint64_t)(*bottle_bw) * net->rtt) / (uint64_t)1000000);
|
|
if (bw_avail > *bottle_bw) {
|
|
/*
|
|
* Cap the growth to no more than the bottle neck. This can
|
|
* happen as RTT slides up due to queues. It also means if
|
|
* you have more than a 1 second RTT with a empty queue you
|
|
* will be limited to the bottle_bw per second no matter if
|
|
* other points have 1/2 the RTT and you could get more
|
|
* out...
|
|
*/
|
|
bw_avail = *bottle_bw;
|
|
}
|
|
if (*on_queue > bw_avail) {
|
|
/*
|
|
* No room for anything else don't allow anything else to be
|
|
* "added to the fire".
|
|
*/
|
|
int seg_inflight, seg_onqueue, my_portion;
|
|
|
|
net->partial_bytes_acked = 0;
|
|
/* how much are we over queue size? */
|
|
incr = *on_queue - bw_avail;
|
|
if (stcb->asoc.seen_a_sack_this_pkt) {
|
|
/*
|
|
* undo any cwnd adjustment that the sack might have
|
|
* made
|
|
*/
|
|
net->cwnd = net->prev_cwnd;
|
|
}
|
|
/* Now how much of that is mine? */
|
|
seg_inflight = net->flight_size / net->mtu;
|
|
seg_onqueue = *on_queue / net->mtu;
|
|
my_portion = (incr * seg_inflight) / seg_onqueue;
|
|
|
|
/* Have I made an adjustment already */
|
|
if (net->cwnd > net->flight_size) {
|
|
/*
|
|
* for this flight I made an adjustment we need to
|
|
* decrease the portion by a share our previous
|
|
* adjustment.
|
|
*/
|
|
int diff_adj;
|
|
|
|
diff_adj = net->cwnd - net->flight_size;
|
|
if (diff_adj > my_portion)
|
|
my_portion = 0;
|
|
else
|
|
my_portion -= diff_adj;
|
|
}
|
|
/*
|
|
* back down to the previous cwnd (assume we have had a sack
|
|
* before this packet). minus what ever portion of the
|
|
* overage is my fault.
|
|
*/
|
|
net->cwnd -= my_portion;
|
|
|
|
/* we will NOT back down more than 1 MTU */
|
|
if (net->cwnd <= net->mtu) {
|
|
net->cwnd = net->mtu;
|
|
}
|
|
/* force into CA */
|
|
net->ssthresh = net->cwnd - 1;
|
|
} else {
|
|
/*
|
|
* Take 1/4 of the space left or max burst up .. whichever
|
|
* is less.
|
|
*/
|
|
incr = (bw_avail - *on_queue) >> 2;
|
|
if ((stcb->asoc.max_burst > 0) &&
|
|
(stcb->asoc.max_burst * net->mtu < incr)) {
|
|
incr = stcb->asoc.max_burst * net->mtu;
|
|
}
|
|
net->cwnd += incr;
|
|
}
|
|
if (net->cwnd > bw_avail) {
|
|
/* We can't exceed the pipe size */
|
|
net->cwnd = bw_avail;
|
|
}
|
|
if (net->cwnd < net->mtu) {
|
|
/* We always have 1 MTU */
|
|
net->cwnd = net->mtu;
|
|
}
|
|
sctp_enforce_cwnd_limit(&stcb->asoc, net);
|
|
if (net->cwnd - old_cwnd != 0) {
|
|
/* log only changes */
|
|
SDT_PROBE5(sctp, cwnd, net, pd,
|
|
stcb->asoc.my_vtag,
|
|
((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
|
|
net,
|
|
old_cwnd, net->cwnd);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd),
|
|
SCTP_CWND_LOG_FROM_SAT);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_update_after_output(struct sctp_tcb *stcb,
|
|
struct sctp_nets *net, int burst_limit)
|
|
{
|
|
int old_cwnd = net->cwnd;
|
|
|
|
if (net->ssthresh < net->cwnd)
|
|
net->ssthresh = net->cwnd;
|
|
if (burst_limit) {
|
|
net->cwnd = (net->flight_size + (burst_limit * net->mtu));
|
|
sctp_enforce_cwnd_limit(&stcb->asoc, net);
|
|
SDT_PROBE5(sctp, cwnd, net, bl,
|
|
stcb->asoc.my_vtag,
|
|
((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
|
|
net,
|
|
old_cwnd, net->cwnd);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_BRST);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_update_after_sack(struct sctp_tcb *stcb,
|
|
struct sctp_association *asoc,
|
|
int accum_moved, int reneged_all, int will_exit)
|
|
{
|
|
/* Passing a zero argument in last disables the rtcc algorithm */
|
|
sctp_cwnd_update_after_sack_common(stcb, asoc, accum_moved, reneged_all, will_exit, 0);
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
|
|
int in_window, int num_pkt_lost)
|
|
{
|
|
/* Passing a zero argument in last disables the rtcc algorithm */
|
|
sctp_cwnd_update_after_ecn_echo_common(stcb, net, in_window, num_pkt_lost, 0);
|
|
}
|
|
|
|
/* Here starts the RTCCVAR type CC invented by RRS which
|
|
* is a slight mod to RFC2581. We reuse a common routine or
|
|
* two since these algorithms are so close and need to
|
|
* remain the same.
|
|
*/
|
|
static void
|
|
sctp_cwnd_update_rtcc_after_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
|
|
int in_window, int num_pkt_lost)
|
|
{
|
|
sctp_cwnd_update_after_ecn_echo_common(stcb, net, in_window, num_pkt_lost, 1);
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_update_rtcc_tsn_acknowledged(struct sctp_nets *net,
|
|
struct sctp_tmit_chunk *tp1)
|
|
{
|
|
net->cc_mod.rtcc.bw_bytes += tp1->send_size;
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_prepare_rtcc_net_for_sack(struct sctp_tcb *stcb SCTP_UNUSED,
|
|
struct sctp_nets *net)
|
|
{
|
|
if (net->cc_mod.rtcc.tls_needs_set > 0) {
|
|
/* We had a bw measurement going on */
|
|
struct timeval ltls;
|
|
|
|
SCTP_GETPTIME_TIMEVAL(<ls);
|
|
timevalsub(<ls, &net->cc_mod.rtcc.tls);
|
|
net->cc_mod.rtcc.new_tot_time = (ltls.tv_sec * 1000000) + ltls.tv_usec;
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_new_rtcc_transmission_begins(struct sctp_tcb *stcb,
|
|
struct sctp_nets *net)
|
|
{
|
|
uint64_t vtag __dtrace, probepoint __dtrace;
|
|
|
|
if (net->cc_mod.rtcc.lbw) {
|
|
/* Clear the old bw.. we went to 0 in-flight */
|
|
vtag = (net->rtt << 32) | (((uint32_t)(stcb->sctp_ep->sctp_lport)) << 16) |
|
|
(stcb->rport);
|
|
probepoint = (((uint64_t)net->cwnd) << 32);
|
|
/* Probe point 8 */
|
|
probepoint |= ((8 << 16) | 0);
|
|
SDT_PROBE5(sctp, cwnd, net, rttvar,
|
|
vtag,
|
|
((net->cc_mod.rtcc.lbw << 32) | 0),
|
|
((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
|
|
net->flight_size,
|
|
probepoint);
|
|
net->cc_mod.rtcc.lbw_rtt = 0;
|
|
net->cc_mod.rtcc.cwnd_at_bw_set = 0;
|
|
net->cc_mod.rtcc.lbw = 0;
|
|
net->cc_mod.rtcc.bw_bytes_at_last_rttc = 0;
|
|
net->cc_mod.rtcc.vol_reduce = 0;
|
|
net->cc_mod.rtcc.bw_tot_time = 0;
|
|
net->cc_mod.rtcc.bw_bytes = 0;
|
|
net->cc_mod.rtcc.tls_needs_set = 0;
|
|
if (net->cc_mod.rtcc.steady_step) {
|
|
net->cc_mod.rtcc.vol_reduce = 0;
|
|
net->cc_mod.rtcc.step_cnt = 0;
|
|
net->cc_mod.rtcc.last_step_state = 0;
|
|
}
|
|
if (net->cc_mod.rtcc.ret_from_eq) {
|
|
/* less aggressive one - reset cwnd too */
|
|
uint32_t cwnd_in_mtu, cwnd;
|
|
|
|
cwnd_in_mtu = SCTP_BASE_SYSCTL(sctp_initial_cwnd);
|
|
if (cwnd_in_mtu == 0) {
|
|
/*
|
|
* Using 0 means that the value of RFC 4960
|
|
* is used.
|
|
*/
|
|
cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND));
|
|
} else {
|
|
/*
|
|
* We take the minimum of the burst limit
|
|
* and the initial congestion window.
|
|
*/
|
|
if ((stcb->asoc.max_burst > 0) && (cwnd_in_mtu > stcb->asoc.max_burst))
|
|
cwnd_in_mtu = stcb->asoc.max_burst;
|
|
cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu;
|
|
}
|
|
if (net->cwnd > cwnd) {
|
|
/*
|
|
* Only set if we are not a timeout (i.e.
|
|
* down to 1 mtu)
|
|
*/
|
|
net->cwnd = cwnd;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_set_rtcc_initial_cc_param(struct sctp_tcb *stcb,
|
|
struct sctp_nets *net)
|
|
{
|
|
#ifdef KDTRACE_HOOOKS
|
|
uint64_t vtag, probepoint;
|
|
#else
|
|
uint64_t vtag __unused, probepoint __unused;
|
|
#endif
|
|
|
|
sctp_set_initial_cc_param(stcb, net);
|
|
stcb->asoc.use_precise_time = 1;
|
|
probepoint = (((uint64_t)net->cwnd) << 32);
|
|
probepoint |= ((9 << 16) | 0);
|
|
vtag = (net->rtt << 32) |
|
|
(((uint32_t)(stcb->sctp_ep->sctp_lport)) << 16) |
|
|
(stcb->rport);
|
|
SDT_PROBE5(sctp, cwnd, net, rttvar,
|
|
vtag,
|
|
0,
|
|
0,
|
|
0,
|
|
probepoint);
|
|
net->cc_mod.rtcc.lbw_rtt = 0;
|
|
net->cc_mod.rtcc.cwnd_at_bw_set = 0;
|
|
net->cc_mod.rtcc.vol_reduce = 0;
|
|
net->cc_mod.rtcc.lbw = 0;
|
|
net->cc_mod.rtcc.vol_reduce = 0;
|
|
net->cc_mod.rtcc.bw_bytes_at_last_rttc = 0;
|
|
net->cc_mod.rtcc.bw_tot_time = 0;
|
|
net->cc_mod.rtcc.bw_bytes = 0;
|
|
net->cc_mod.rtcc.tls_needs_set = 0;
|
|
net->cc_mod.rtcc.ret_from_eq = SCTP_BASE_SYSCTL(sctp_rttvar_eqret);
|
|
net->cc_mod.rtcc.steady_step = SCTP_BASE_SYSCTL(sctp_steady_step);
|
|
net->cc_mod.rtcc.use_dccc_ecn = SCTP_BASE_SYSCTL(sctp_use_dccc_ecn);
|
|
net->cc_mod.rtcc.step_cnt = 0;
|
|
net->cc_mod.rtcc.last_step_state = 0;
|
|
}
|
|
|
|
static int
|
|
sctp_cwnd_rtcc_socket_option(struct sctp_tcb *stcb, int setorget,
|
|
struct sctp_cc_option *cc_opt)
|
|
{
|
|
struct sctp_nets *net;
|
|
|
|
if (setorget == 1) {
|
|
/* a set */
|
|
if (cc_opt->option == SCTP_CC_OPT_RTCC_SETMODE) {
|
|
if ((cc_opt->aid_value.assoc_value != 0) &&
|
|
(cc_opt->aid_value.assoc_value != 1)) {
|
|
return (EINVAL);
|
|
}
|
|
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
|
|
net->cc_mod.rtcc.ret_from_eq = cc_opt->aid_value.assoc_value;
|
|
}
|
|
} else if (cc_opt->option == SCTP_CC_OPT_USE_DCCC_ECN) {
|
|
if ((cc_opt->aid_value.assoc_value != 0) &&
|
|
(cc_opt->aid_value.assoc_value != 1)) {
|
|
return (EINVAL);
|
|
}
|
|
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
|
|
net->cc_mod.rtcc.use_dccc_ecn = cc_opt->aid_value.assoc_value;
|
|
}
|
|
} else if (cc_opt->option == SCTP_CC_OPT_STEADY_STEP) {
|
|
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
|
|
net->cc_mod.rtcc.steady_step = cc_opt->aid_value.assoc_value;
|
|
}
|
|
} else {
|
|
return (EINVAL);
|
|
}
|
|
} else {
|
|
/* a get */
|
|
if (cc_opt->option == SCTP_CC_OPT_RTCC_SETMODE) {
|
|
net = TAILQ_FIRST(&stcb->asoc.nets);
|
|
if (net == NULL) {
|
|
return (EFAULT);
|
|
}
|
|
cc_opt->aid_value.assoc_value = net->cc_mod.rtcc.ret_from_eq;
|
|
} else if (cc_opt->option == SCTP_CC_OPT_USE_DCCC_ECN) {
|
|
net = TAILQ_FIRST(&stcb->asoc.nets);
|
|
if (net == NULL) {
|
|
return (EFAULT);
|
|
}
|
|
cc_opt->aid_value.assoc_value = net->cc_mod.rtcc.use_dccc_ecn;
|
|
} else if (cc_opt->option == SCTP_CC_OPT_STEADY_STEP) {
|
|
net = TAILQ_FIRST(&stcb->asoc.nets);
|
|
if (net == NULL) {
|
|
return (EFAULT);
|
|
}
|
|
cc_opt->aid_value.assoc_value = net->cc_mod.rtcc.steady_step;
|
|
} else {
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_update_rtcc_packet_transmitted(struct sctp_tcb *stcb SCTP_UNUSED,
|
|
struct sctp_nets *net)
|
|
{
|
|
if (net->cc_mod.rtcc.tls_needs_set == 0) {
|
|
SCTP_GETPTIME_TIMEVAL(&net->cc_mod.rtcc.tls);
|
|
net->cc_mod.rtcc.tls_needs_set = 2;
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_cwnd_update_rtcc_after_sack(struct sctp_tcb *stcb,
|
|
struct sctp_association *asoc,
|
|
int accum_moved, int reneged_all, int will_exit)
|
|
{
|
|
/* Passing a one argument at the last enables the rtcc algorithm */
|
|
sctp_cwnd_update_after_sack_common(stcb, asoc, accum_moved, reneged_all, will_exit, 1);
|
|
}
|
|
|
|
static void
|
|
sctp_rtt_rtcc_calculated(struct sctp_tcb *stcb SCTP_UNUSED,
|
|
struct sctp_nets *net,
|
|
struct timeval *now SCTP_UNUSED)
|
|
{
|
|
net->cc_mod.rtcc.rtt_set_this_sack = 1;
|
|
}
|
|
|
|
/* Here starts Sally Floyds HS-TCP */
|
|
|
|
struct sctp_hs_raise_drop {
|
|
int32_t cwnd;
|
|
int8_t increase;
|
|
int8_t drop_percent;
|
|
};
|
|
|
|
#define SCTP_HS_TABLE_SIZE 73
|
|
|
|
static const struct sctp_hs_raise_drop sctp_cwnd_adjust[SCTP_HS_TABLE_SIZE] = {
|
|
{38, 1, 50}, /* 0 */
|
|
{118, 2, 44}, /* 1 */
|
|
{221, 3, 41}, /* 2 */
|
|
{347, 4, 38}, /* 3 */
|
|
{495, 5, 37}, /* 4 */
|
|
{663, 6, 35}, /* 5 */
|
|
{851, 7, 34}, /* 6 */
|
|
{1058, 8, 33}, /* 7 */
|
|
{1284, 9, 32}, /* 8 */
|
|
{1529, 10, 31}, /* 9 */
|
|
{1793, 11, 30}, /* 10 */
|
|
{2076, 12, 29}, /* 11 */
|
|
{2378, 13, 28}, /* 12 */
|
|
{2699, 14, 28}, /* 13 */
|
|
{3039, 15, 27}, /* 14 */
|
|
{3399, 16, 27}, /* 15 */
|
|
{3778, 17, 26}, /* 16 */
|
|
{4177, 18, 26}, /* 17 */
|
|
{4596, 19, 25}, /* 18 */
|
|
{5036, 20, 25}, /* 19 */
|
|
{5497, 21, 24}, /* 20 */
|
|
{5979, 22, 24}, /* 21 */
|
|
{6483, 23, 23}, /* 22 */
|
|
{7009, 24, 23}, /* 23 */
|
|
{7558, 25, 22}, /* 24 */
|
|
{8130, 26, 22}, /* 25 */
|
|
{8726, 27, 22}, /* 26 */
|
|
{9346, 28, 21}, /* 27 */
|
|
{9991, 29, 21}, /* 28 */
|
|
{10661, 30, 21}, /* 29 */
|
|
{11358, 31, 20}, /* 30 */
|
|
{12082, 32, 20}, /* 31 */
|
|
{12834, 33, 20}, /* 32 */
|
|
{13614, 34, 19}, /* 33 */
|
|
{14424, 35, 19}, /* 34 */
|
|
{15265, 36, 19}, /* 35 */
|
|
{16137, 37, 19}, /* 36 */
|
|
{17042, 38, 18}, /* 37 */
|
|
{17981, 39, 18}, /* 38 */
|
|
{18955, 40, 18}, /* 39 */
|
|
{19965, 41, 17}, /* 40 */
|
|
{21013, 42, 17}, /* 41 */
|
|
{22101, 43, 17}, /* 42 */
|
|
{23230, 44, 17}, /* 43 */
|
|
{24402, 45, 16}, /* 44 */
|
|
{25618, 46, 16}, /* 45 */
|
|
{26881, 47, 16}, /* 46 */
|
|
{28193, 48, 16}, /* 47 */
|
|
{29557, 49, 15}, /* 48 */
|
|
{30975, 50, 15}, /* 49 */
|
|
{32450, 51, 15}, /* 50 */
|
|
{33986, 52, 15}, /* 51 */
|
|
{35586, 53, 14}, /* 52 */
|
|
{37253, 54, 14}, /* 53 */
|
|
{38992, 55, 14}, /* 54 */
|
|
{40808, 56, 14}, /* 55 */
|
|
{42707, 57, 13}, /* 56 */
|
|
{44694, 58, 13}, /* 57 */
|
|
{46776, 59, 13}, /* 58 */
|
|
{48961, 60, 13}, /* 59 */
|
|
{51258, 61, 13}, /* 60 */
|
|
{53677, 62, 12}, /* 61 */
|
|
{56230, 63, 12}, /* 62 */
|
|
{58932, 64, 12}, /* 63 */
|
|
{61799, 65, 12}, /* 64 */
|
|
{64851, 66, 11}, /* 65 */
|
|
{68113, 67, 11}, /* 66 */
|
|
{71617, 68, 11}, /* 67 */
|
|
{75401, 69, 10}, /* 68 */
|
|
{79517, 70, 10}, /* 69 */
|
|
{84035, 71, 10}, /* 70 */
|
|
{89053, 72, 10}, /* 71 */
|
|
{94717, 73, 9} /* 72 */
|
|
};
|
|
|
|
static void
|
|
sctp_hs_cwnd_increase(struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
int cur_val, i, indx, incr;
|
|
int old_cwnd = net->cwnd;
|
|
|
|
cur_val = net->cwnd >> 10;
|
|
indx = SCTP_HS_TABLE_SIZE - 1;
|
|
|
|
if (cur_val < sctp_cwnd_adjust[0].cwnd) {
|
|
/* normal mode */
|
|
if (net->net_ack > net->mtu) {
|
|
net->cwnd += net->mtu;
|
|
} else {
|
|
net->cwnd += net->net_ack;
|
|
}
|
|
} else {
|
|
for (i = net->last_hs_used; i < SCTP_HS_TABLE_SIZE; i++) {
|
|
if (cur_val < sctp_cwnd_adjust[i].cwnd) {
|
|
indx = i;
|
|
break;
|
|
}
|
|
}
|
|
net->last_hs_used = indx;
|
|
incr = (((int32_t)sctp_cwnd_adjust[indx].increase) << 10);
|
|
net->cwnd += incr;
|
|
}
|
|
sctp_enforce_cwnd_limit(&stcb->asoc, net);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SS);
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_hs_cwnd_decrease(struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
int cur_val, i, indx;
|
|
int old_cwnd = net->cwnd;
|
|
|
|
cur_val = net->cwnd >> 10;
|
|
if (cur_val < sctp_cwnd_adjust[0].cwnd) {
|
|
/* normal mode */
|
|
net->ssthresh = net->cwnd / 2;
|
|
if (net->ssthresh < (net->mtu * 2)) {
|
|
net->ssthresh = 2 * net->mtu;
|
|
}
|
|
net->cwnd = net->ssthresh;
|
|
} else {
|
|
/* drop by the proper amount */
|
|
net->ssthresh = net->cwnd - (int)((net->cwnd / 100) *
|
|
(int32_t)sctp_cwnd_adjust[net->last_hs_used].drop_percent);
|
|
net->cwnd = net->ssthresh;
|
|
/* now where are we */
|
|
indx = net->last_hs_used;
|
|
cur_val = net->cwnd >> 10;
|
|
/* reset where we are in the table */
|
|
if (cur_val < sctp_cwnd_adjust[0].cwnd) {
|
|
/* feel out of hs */
|
|
net->last_hs_used = 0;
|
|
} else {
|
|
for (i = indx; i >= 1; i--) {
|
|
if (cur_val > sctp_cwnd_adjust[i - 1].cwnd) {
|
|
break;
|
|
}
|
|
}
|
|
net->last_hs_used = indx;
|
|
}
|
|
}
|
|
sctp_enforce_cwnd_limit(&stcb->asoc, net);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_FR);
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_hs_cwnd_update_after_fr(struct sctp_tcb *stcb,
|
|
struct sctp_association *asoc)
|
|
{
|
|
struct sctp_nets *net;
|
|
|
|
/*
|
|
* CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) &&
|
|
* (net->fast_retran_loss_recovery == 0)))
|
|
*/
|
|
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
|
|
if ((asoc->fast_retran_loss_recovery == 0) ||
|
|
(asoc->sctp_cmt_on_off > 0)) {
|
|
/* out of a RFC2582 Fast recovery window? */
|
|
if (net->net_ack > 0) {
|
|
/*
|
|
* per section 7.2.3, are there any
|
|
* destinations that had a fast retransmit
|
|
* to them. If so what we need to do is
|
|
* adjust ssthresh and cwnd.
|
|
*/
|
|
struct sctp_tmit_chunk *lchk;
|
|
|
|
sctp_hs_cwnd_decrease(stcb, net);
|
|
|
|
lchk = TAILQ_FIRST(&asoc->send_queue);
|
|
|
|
net->partial_bytes_acked = 0;
|
|
/* Turn on fast recovery window */
|
|
asoc->fast_retran_loss_recovery = 1;
|
|
if (lchk == NULL) {
|
|
/* Mark end of the window */
|
|
asoc->fast_recovery_tsn = asoc->sending_seq - 1;
|
|
} else {
|
|
asoc->fast_recovery_tsn = lchk->rec.data.tsn - 1;
|
|
}
|
|
|
|
/*
|
|
* CMT fast recovery -- per destination
|
|
* recovery variable.
|
|
*/
|
|
net->fast_retran_loss_recovery = 1;
|
|
|
|
if (lchk == NULL) {
|
|
/* Mark end of the window */
|
|
net->fast_recovery_tsn = asoc->sending_seq - 1;
|
|
} else {
|
|
net->fast_recovery_tsn = lchk->rec.data.tsn - 1;
|
|
}
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_SEND,
|
|
stcb->sctp_ep, stcb, net,
|
|
SCTP_FROM_SCTP_CC_FUNCTIONS + SCTP_LOC_2);
|
|
sctp_timer_start(SCTP_TIMER_TYPE_SEND,
|
|
stcb->sctp_ep, stcb, net);
|
|
}
|
|
} else if (net->net_ack > 0) {
|
|
/*
|
|
* Mark a peg that we WOULD have done a cwnd
|
|
* reduction but RFC2582 prevented this action.
|
|
*/
|
|
SCTP_STAT_INCR(sctps_fastretransinrtt);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_hs_cwnd_update_after_sack(struct sctp_tcb *stcb,
|
|
struct sctp_association *asoc,
|
|
int accum_moved, int reneged_all SCTP_UNUSED, int will_exit)
|
|
{
|
|
struct sctp_nets *net;
|
|
|
|
/******************************/
|
|
/* update cwnd and Early FR */
|
|
/******************************/
|
|
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
|
|
#ifdef JANA_CMT_FAST_RECOVERY
|
|
/*
|
|
* CMT fast recovery code. Need to debug.
|
|
*/
|
|
if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) {
|
|
if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) ||
|
|
SCTP_TSN_GE(net->pseudo_cumack, net->fast_recovery_tsn)) {
|
|
net->will_exit_fast_recovery = 1;
|
|
}
|
|
}
|
|
#endif
|
|
/* if nothing was acked on this destination skip it */
|
|
if (net->net_ack == 0) {
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK);
|
|
}
|
|
continue;
|
|
}
|
|
#ifdef JANA_CMT_FAST_RECOVERY
|
|
/*
|
|
* CMT fast recovery code
|
|
*/
|
|
/*
|
|
* if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery
|
|
* && net->will_exit_fast_recovery == 0) { @@@ Do something
|
|
* } else if (sctp_cmt_on_off == 0 &&
|
|
* asoc->fast_retran_loss_recovery && will_exit == 0) {
|
|
*/
|
|
#endif
|
|
|
|
if (asoc->fast_retran_loss_recovery &&
|
|
(will_exit == 0) &&
|
|
(asoc->sctp_cmt_on_off == 0)) {
|
|
/*
|
|
* If we are in loss recovery we skip any cwnd
|
|
* update
|
|
*/
|
|
return;
|
|
}
|
|
/*
|
|
* CMT: CUC algorithm. Update cwnd if pseudo-cumack has
|
|
* moved.
|
|
*/
|
|
if (accum_moved ||
|
|
((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) {
|
|
/* If the cumulative ack moved we can proceed */
|
|
if (net->cwnd <= net->ssthresh) {
|
|
/* We are in slow start */
|
|
if (net->flight_size + net->net_ack >= net->cwnd) {
|
|
sctp_hs_cwnd_increase(stcb, net);
|
|
} else {
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->net_ack,
|
|
SCTP_CWND_LOG_NOADV_SS);
|
|
}
|
|
}
|
|
} else {
|
|
/* We are in congestion avoidance */
|
|
net->partial_bytes_acked += net->net_ack;
|
|
if ((net->flight_size + net->net_ack >= net->cwnd) &&
|
|
(net->partial_bytes_acked >= net->cwnd)) {
|
|
net->partial_bytes_acked -= net->cwnd;
|
|
net->cwnd += net->mtu;
|
|
sctp_enforce_cwnd_limit(asoc, net);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->mtu,
|
|
SCTP_CWND_LOG_FROM_CA);
|
|
}
|
|
} else {
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->net_ack,
|
|
SCTP_CWND_LOG_NOADV_CA);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->mtu,
|
|
SCTP_CWND_LOG_NO_CUMACK);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* H-TCP congestion control. The algorithm is detailed in:
|
|
* R.N.Shorten, D.J.Leith:
|
|
* "H-TCP: TCP for high-speed and long-distance networks"
|
|
* Proc. PFLDnet, Argonne, 2004.
|
|
* http://www.hamilton.ie/net/htcp3.pdf
|
|
*/
|
|
|
|
static int use_rtt_scaling = 1;
|
|
static int use_bandwidth_switch = 1;
|
|
|
|
static inline int
|
|
between(uint32_t seq1, uint32_t seq2, uint32_t seq3)
|
|
{
|
|
return (seq3 - seq2 >= seq1 - seq2);
|
|
}
|
|
|
|
static inline uint32_t
|
|
htcp_cong_time(struct htcp *ca)
|
|
{
|
|
return (sctp_get_tick_count() - ca->last_cong);
|
|
}
|
|
|
|
static inline uint32_t
|
|
htcp_ccount(struct htcp *ca)
|
|
{
|
|
return (ca->minRTT == 0 ? htcp_cong_time(ca) : htcp_cong_time(ca) / ca->minRTT);
|
|
}
|
|
|
|
static inline void
|
|
htcp_reset(struct htcp *ca)
|
|
{
|
|
ca->undo_last_cong = ca->last_cong;
|
|
ca->undo_maxRTT = ca->maxRTT;
|
|
ca->undo_old_maxB = ca->old_maxB;
|
|
ca->last_cong = sctp_get_tick_count();
|
|
}
|
|
|
|
#ifdef SCTP_NOT_USED
|
|
|
|
static uint32_t
|
|
htcp_cwnd_undo(struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
net->cc_mod.htcp_ca.last_cong = net->cc_mod.htcp_ca.undo_last_cong;
|
|
net->cc_mod.htcp_ca.maxRTT = net->cc_mod.htcp_ca.undo_maxRTT;
|
|
net->cc_mod.htcp_ca.old_maxB = net->cc_mod.htcp_ca.undo_old_maxB;
|
|
return (max(net->cwnd, ((net->ssthresh / net->mtu << 7) / net->cc_mod.htcp_ca.beta) * net->mtu));
|
|
}
|
|
|
|
#endif
|
|
|
|
static inline void
|
|
measure_rtt(struct sctp_nets *net)
|
|
{
|
|
uint32_t srtt = net->lastsa >> SCTP_RTT_SHIFT;
|
|
|
|
/* keep track of minimum RTT seen so far, minRTT is zero at first */
|
|
if (net->cc_mod.htcp_ca.minRTT > srtt || !net->cc_mod.htcp_ca.minRTT)
|
|
net->cc_mod.htcp_ca.minRTT = srtt;
|
|
|
|
/* max RTT */
|
|
if (net->fast_retran_ip == 0 && net->ssthresh < 0xFFFF && htcp_ccount(&net->cc_mod.htcp_ca) > 3) {
|
|
if (net->cc_mod.htcp_ca.maxRTT < net->cc_mod.htcp_ca.minRTT)
|
|
net->cc_mod.htcp_ca.maxRTT = net->cc_mod.htcp_ca.minRTT;
|
|
if (net->cc_mod.htcp_ca.maxRTT < srtt && srtt <= net->cc_mod.htcp_ca.maxRTT + sctp_msecs_to_ticks(20))
|
|
net->cc_mod.htcp_ca.maxRTT = srtt;
|
|
}
|
|
}
|
|
|
|
static void
|
|
measure_achieved_throughput(struct sctp_nets *net)
|
|
{
|
|
uint32_t now = sctp_get_tick_count();
|
|
|
|
if (net->fast_retran_ip == 0)
|
|
net->cc_mod.htcp_ca.bytes_acked = net->net_ack;
|
|
|
|
if (!use_bandwidth_switch)
|
|
return;
|
|
|
|
/* achieved throughput calculations */
|
|
/* JRS - not 100% sure of this statement */
|
|
if (net->fast_retran_ip == 1) {
|
|
net->cc_mod.htcp_ca.bytecount = 0;
|
|
net->cc_mod.htcp_ca.lasttime = now;
|
|
return;
|
|
}
|
|
|
|
net->cc_mod.htcp_ca.bytecount += net->net_ack;
|
|
if ((net->cc_mod.htcp_ca.bytecount >= net->cwnd - (((net->cc_mod.htcp_ca.alpha >> 7) ? (net->cc_mod.htcp_ca.alpha >> 7) : 1) * net->mtu)) &&
|
|
(now - net->cc_mod.htcp_ca.lasttime >= net->cc_mod.htcp_ca.minRTT) &&
|
|
(net->cc_mod.htcp_ca.minRTT > 0)) {
|
|
uint32_t cur_Bi = net->cc_mod.htcp_ca.bytecount / net->mtu * hz / (now - net->cc_mod.htcp_ca.lasttime);
|
|
|
|
if (htcp_ccount(&net->cc_mod.htcp_ca) <= 3) {
|
|
/* just after backoff */
|
|
net->cc_mod.htcp_ca.minB = net->cc_mod.htcp_ca.maxB = net->cc_mod.htcp_ca.Bi = cur_Bi;
|
|
} else {
|
|
net->cc_mod.htcp_ca.Bi = (3 * net->cc_mod.htcp_ca.Bi + cur_Bi) / 4;
|
|
if (net->cc_mod.htcp_ca.Bi > net->cc_mod.htcp_ca.maxB)
|
|
net->cc_mod.htcp_ca.maxB = net->cc_mod.htcp_ca.Bi;
|
|
if (net->cc_mod.htcp_ca.minB > net->cc_mod.htcp_ca.maxB)
|
|
net->cc_mod.htcp_ca.minB = net->cc_mod.htcp_ca.maxB;
|
|
}
|
|
net->cc_mod.htcp_ca.bytecount = 0;
|
|
net->cc_mod.htcp_ca.lasttime = now;
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
htcp_beta_update(struct htcp *ca, uint32_t minRTT, uint32_t maxRTT)
|
|
{
|
|
if (use_bandwidth_switch) {
|
|
uint32_t maxB = ca->maxB;
|
|
uint32_t old_maxB = ca->old_maxB;
|
|
|
|
ca->old_maxB = ca->maxB;
|
|
|
|
if (!between(5 * maxB, 4 * old_maxB, 6 * old_maxB)) {
|
|
ca->beta = BETA_MIN;
|
|
ca->modeswitch = 0;
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (ca->modeswitch && minRTT > sctp_msecs_to_ticks(10) && maxRTT) {
|
|
ca->beta = (minRTT << 7) / maxRTT;
|
|
if (ca->beta < BETA_MIN)
|
|
ca->beta = BETA_MIN;
|
|
else if (ca->beta > BETA_MAX)
|
|
ca->beta = BETA_MAX;
|
|
} else {
|
|
ca->beta = BETA_MIN;
|
|
ca->modeswitch = 1;
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
htcp_alpha_update(struct htcp *ca)
|
|
{
|
|
uint32_t minRTT = ca->minRTT;
|
|
uint32_t factor = 1;
|
|
uint32_t diff = htcp_cong_time(ca);
|
|
|
|
if (diff > (uint32_t)hz) {
|
|
diff -= hz;
|
|
factor = 1 + (10 * diff + ((diff / 2) * (diff / 2) / hz)) / hz;
|
|
}
|
|
|
|
if (use_rtt_scaling && minRTT) {
|
|
uint32_t scale = (hz << 3) / (10 * minRTT);
|
|
|
|
scale = min(max(scale, 1U << 2), 10U << 3); /* clamping ratio to
|
|
* interval [0.5,10]<<3 */
|
|
factor = (factor << 3) / scale;
|
|
if (factor != 0)
|
|
factor = 1;
|
|
}
|
|
|
|
ca->alpha = 2 * factor * ((1 << 7) - ca->beta);
|
|
if (ca->alpha != 0)
|
|
ca->alpha = ALPHA_BASE;
|
|
}
|
|
|
|
/* After we have the rtt data to calculate beta, we'd still prefer to wait one
|
|
* rtt before we adjust our beta to ensure we are working from a consistent
|
|
* data.
|
|
*
|
|
* This function should be called when we hit a congestion event since only at
|
|
* that point do we really have a real sense of maxRTT (the queues en route
|
|
* were getting just too full now).
|
|
*/
|
|
static void
|
|
htcp_param_update(struct sctp_nets *net)
|
|
{
|
|
uint32_t minRTT = net->cc_mod.htcp_ca.minRTT;
|
|
uint32_t maxRTT = net->cc_mod.htcp_ca.maxRTT;
|
|
|
|
htcp_beta_update(&net->cc_mod.htcp_ca, minRTT, maxRTT);
|
|
htcp_alpha_update(&net->cc_mod.htcp_ca);
|
|
|
|
/*
|
|
* add slowly fading memory for maxRTT to accommodate routing
|
|
* changes etc
|
|
*/
|
|
if (minRTT > 0 && maxRTT > minRTT)
|
|
net->cc_mod.htcp_ca.maxRTT = minRTT + ((maxRTT - minRTT) * 95) / 100;
|
|
}
|
|
|
|
static uint32_t
|
|
htcp_recalc_ssthresh(struct sctp_nets *net)
|
|
{
|
|
htcp_param_update(net);
|
|
return (max(((net->cwnd / net->mtu * net->cc_mod.htcp_ca.beta) >> 7) * net->mtu, 2U * net->mtu));
|
|
}
|
|
|
|
static void
|
|
htcp_cong_avoid(struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
/*-
|
|
* How to handle these functions?
|
|
* if (!tcp_is_cwnd_limited(sk, in_flight)) RRS - good question.
|
|
* return;
|
|
*/
|
|
if (net->cwnd <= net->ssthresh) {
|
|
/* We are in slow start */
|
|
if (net->flight_size + net->net_ack >= net->cwnd) {
|
|
if (net->net_ack > (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable))) {
|
|
net->cwnd += (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable));
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->mtu,
|
|
SCTP_CWND_LOG_FROM_SS);
|
|
}
|
|
|
|
} else {
|
|
net->cwnd += net->net_ack;
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->net_ack,
|
|
SCTP_CWND_LOG_FROM_SS);
|
|
}
|
|
}
|
|
sctp_enforce_cwnd_limit(&stcb->asoc, net);
|
|
} else {
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->net_ack,
|
|
SCTP_CWND_LOG_NOADV_SS);
|
|
}
|
|
}
|
|
} else {
|
|
measure_rtt(net);
|
|
|
|
/*
|
|
* In dangerous area, increase slowly. In theory this is
|
|
* net->cwnd += alpha / net->cwnd
|
|
*/
|
|
/* What is snd_cwnd_cnt?? */
|
|
if (((net->partial_bytes_acked / net->mtu * net->cc_mod.htcp_ca.alpha) >> 7) * net->mtu >= net->cwnd) {
|
|
/*-
|
|
* Does SCTP have a cwnd clamp?
|
|
* if (net->snd_cwnd < net->snd_cwnd_clamp) - Nope (RRS).
|
|
*/
|
|
net->cwnd += net->mtu;
|
|
net->partial_bytes_acked = 0;
|
|
sctp_enforce_cwnd_limit(&stcb->asoc, net);
|
|
htcp_alpha_update(&net->cc_mod.htcp_ca);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->mtu,
|
|
SCTP_CWND_LOG_FROM_CA);
|
|
}
|
|
} else {
|
|
net->partial_bytes_acked += net->net_ack;
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->net_ack,
|
|
SCTP_CWND_LOG_NOADV_CA);
|
|
}
|
|
}
|
|
|
|
net->cc_mod.htcp_ca.bytes_acked = net->mtu;
|
|
}
|
|
}
|
|
|
|
#ifdef SCTP_NOT_USED
|
|
/* Lower bound on congestion window. */
|
|
static uint32_t
|
|
htcp_min_cwnd(struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
return (net->ssthresh);
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
htcp_init(struct sctp_nets *net)
|
|
{
|
|
memset(&net->cc_mod.htcp_ca, 0, sizeof(struct htcp));
|
|
net->cc_mod.htcp_ca.alpha = ALPHA_BASE;
|
|
net->cc_mod.htcp_ca.beta = BETA_MIN;
|
|
net->cc_mod.htcp_ca.bytes_acked = net->mtu;
|
|
net->cc_mod.htcp_ca.last_cong = sctp_get_tick_count();
|
|
}
|
|
|
|
static void
|
|
sctp_htcp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
/*
|
|
* We take the max of the burst limit times a MTU or the
|
|
* INITIAL_CWND. We then limit this to 4 MTU's of sending.
|
|
*/
|
|
net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND));
|
|
net->ssthresh = stcb->asoc.peers_rwnd;
|
|
sctp_enforce_cwnd_limit(&stcb->asoc, net);
|
|
htcp_init(net);
|
|
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
|
|
sctp_log_cwnd(stcb, net, 0, SCTP_CWND_INITIALIZATION);
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_htcp_cwnd_update_after_sack(struct sctp_tcb *stcb,
|
|
struct sctp_association *asoc,
|
|
int accum_moved, int reneged_all SCTP_UNUSED, int will_exit)
|
|
{
|
|
struct sctp_nets *net;
|
|
|
|
/******************************/
|
|
/* update cwnd and Early FR */
|
|
/******************************/
|
|
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
|
|
#ifdef JANA_CMT_FAST_RECOVERY
|
|
/*
|
|
* CMT fast recovery code. Need to debug.
|
|
*/
|
|
if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) {
|
|
if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) ||
|
|
SCTP_TSN_GE(net->pseudo_cumack, net->fast_recovery_tsn)) {
|
|
net->will_exit_fast_recovery = 1;
|
|
}
|
|
}
|
|
#endif
|
|
/* if nothing was acked on this destination skip it */
|
|
if (net->net_ack == 0) {
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK);
|
|
}
|
|
continue;
|
|
}
|
|
#ifdef JANA_CMT_FAST_RECOVERY
|
|
/*
|
|
* CMT fast recovery code
|
|
*/
|
|
/*
|
|
* if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery
|
|
* && net->will_exit_fast_recovery == 0) { @@@ Do something
|
|
* } else if (sctp_cmt_on_off == 0 &&
|
|
* asoc->fast_retran_loss_recovery && will_exit == 0) {
|
|
*/
|
|
#endif
|
|
|
|
if (asoc->fast_retran_loss_recovery &&
|
|
will_exit == 0 &&
|
|
(asoc->sctp_cmt_on_off == 0)) {
|
|
/*
|
|
* If we are in loss recovery we skip any cwnd
|
|
* update
|
|
*/
|
|
return;
|
|
}
|
|
/*
|
|
* CMT: CUC algorithm. Update cwnd if pseudo-cumack has
|
|
* moved.
|
|
*/
|
|
if (accum_moved ||
|
|
((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) {
|
|
htcp_cong_avoid(stcb, net);
|
|
measure_achieved_throughput(net);
|
|
} else {
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->mtu,
|
|
SCTP_CWND_LOG_NO_CUMACK);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_htcp_cwnd_update_after_fr(struct sctp_tcb *stcb,
|
|
struct sctp_association *asoc)
|
|
{
|
|
struct sctp_nets *net;
|
|
|
|
/*
|
|
* CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) &&
|
|
* (net->fast_retran_loss_recovery == 0)))
|
|
*/
|
|
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
|
|
if ((asoc->fast_retran_loss_recovery == 0) ||
|
|
(asoc->sctp_cmt_on_off > 0)) {
|
|
/* out of a RFC2582 Fast recovery window? */
|
|
if (net->net_ack > 0) {
|
|
/*
|
|
* per section 7.2.3, are there any
|
|
* destinations that had a fast retransmit
|
|
* to them. If so what we need to do is
|
|
* adjust ssthresh and cwnd.
|
|
*/
|
|
struct sctp_tmit_chunk *lchk;
|
|
int old_cwnd = net->cwnd;
|
|
|
|
/* JRS - reset as if state were changed */
|
|
htcp_reset(&net->cc_mod.htcp_ca);
|
|
net->ssthresh = htcp_recalc_ssthresh(net);
|
|
net->cwnd = net->ssthresh;
|
|
sctp_enforce_cwnd_limit(asoc, net);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd),
|
|
SCTP_CWND_LOG_FROM_FR);
|
|
}
|
|
lchk = TAILQ_FIRST(&asoc->send_queue);
|
|
|
|
net->partial_bytes_acked = 0;
|
|
/* Turn on fast recovery window */
|
|
asoc->fast_retran_loss_recovery = 1;
|
|
if (lchk == NULL) {
|
|
/* Mark end of the window */
|
|
asoc->fast_recovery_tsn = asoc->sending_seq - 1;
|
|
} else {
|
|
asoc->fast_recovery_tsn = lchk->rec.data.tsn - 1;
|
|
}
|
|
|
|
/*
|
|
* CMT fast recovery -- per destination
|
|
* recovery variable.
|
|
*/
|
|
net->fast_retran_loss_recovery = 1;
|
|
|
|
if (lchk == NULL) {
|
|
/* Mark end of the window */
|
|
net->fast_recovery_tsn = asoc->sending_seq - 1;
|
|
} else {
|
|
net->fast_recovery_tsn = lchk->rec.data.tsn - 1;
|
|
}
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_SEND,
|
|
stcb->sctp_ep, stcb, net,
|
|
SCTP_FROM_SCTP_CC_FUNCTIONS + SCTP_LOC_3);
|
|
sctp_timer_start(SCTP_TIMER_TYPE_SEND,
|
|
stcb->sctp_ep, stcb, net);
|
|
}
|
|
} else if (net->net_ack > 0) {
|
|
/*
|
|
* Mark a peg that we WOULD have done a cwnd
|
|
* reduction but RFC2582 prevented this action.
|
|
*/
|
|
SCTP_STAT_INCR(sctps_fastretransinrtt);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_htcp_cwnd_update_after_timeout(struct sctp_tcb *stcb,
|
|
struct sctp_nets *net)
|
|
{
|
|
int old_cwnd = net->cwnd;
|
|
|
|
/* JRS - reset as if the state were being changed to timeout */
|
|
htcp_reset(&net->cc_mod.htcp_ca);
|
|
net->ssthresh = htcp_recalc_ssthresh(net);
|
|
net->cwnd = net->mtu;
|
|
net->partial_bytes_acked = 0;
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX);
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_htcp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb,
|
|
struct sctp_nets *net, int in_window, int num_pkt_lost SCTP_UNUSED)
|
|
{
|
|
int old_cwnd;
|
|
|
|
old_cwnd = net->cwnd;
|
|
|
|
/* JRS - reset hctp as if state changed */
|
|
if (in_window == 0) {
|
|
htcp_reset(&net->cc_mod.htcp_ca);
|
|
SCTP_STAT_INCR(sctps_ecnereducedcwnd);
|
|
net->ssthresh = htcp_recalc_ssthresh(net);
|
|
if (net->ssthresh < net->mtu) {
|
|
net->ssthresh = net->mtu;
|
|
/* here back off the timer as well, to slow us down */
|
|
net->RTO <<= 1;
|
|
}
|
|
net->cwnd = net->ssthresh;
|
|
sctp_enforce_cwnd_limit(&stcb->asoc, net);
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT);
|
|
}
|
|
}
|
|
}
|
|
|
|
const struct sctp_cc_functions sctp_cc_functions[] = {
|
|
{
|
|
.sctp_set_initial_cc_param = sctp_set_initial_cc_param,
|
|
.sctp_cwnd_update_after_sack = sctp_cwnd_update_after_sack,
|
|
.sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common,
|
|
.sctp_cwnd_update_after_fr = sctp_cwnd_update_after_fr,
|
|
.sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout,
|
|
.sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_after_ecn_echo,
|
|
.sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped,
|
|
.sctp_cwnd_update_after_output = sctp_cwnd_update_after_output,
|
|
},
|
|
{
|
|
.sctp_set_initial_cc_param = sctp_set_initial_cc_param,
|
|
.sctp_cwnd_update_after_sack = sctp_hs_cwnd_update_after_sack,
|
|
.sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common,
|
|
.sctp_cwnd_update_after_fr = sctp_hs_cwnd_update_after_fr,
|
|
.sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout,
|
|
.sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_after_ecn_echo,
|
|
.sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped,
|
|
.sctp_cwnd_update_after_output = sctp_cwnd_update_after_output,
|
|
},
|
|
{
|
|
.sctp_set_initial_cc_param = sctp_htcp_set_initial_cc_param,
|
|
.sctp_cwnd_update_after_sack = sctp_htcp_cwnd_update_after_sack,
|
|
.sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common,
|
|
.sctp_cwnd_update_after_fr = sctp_htcp_cwnd_update_after_fr,
|
|
.sctp_cwnd_update_after_timeout = sctp_htcp_cwnd_update_after_timeout,
|
|
.sctp_cwnd_update_after_ecn_echo = sctp_htcp_cwnd_update_after_ecn_echo,
|
|
.sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped,
|
|
.sctp_cwnd_update_after_output = sctp_cwnd_update_after_output,
|
|
},
|
|
{
|
|
.sctp_set_initial_cc_param = sctp_set_rtcc_initial_cc_param,
|
|
.sctp_cwnd_update_after_sack = sctp_cwnd_update_rtcc_after_sack,
|
|
.sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common,
|
|
.sctp_cwnd_update_after_fr = sctp_cwnd_update_after_fr,
|
|
.sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout,
|
|
.sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_rtcc_after_ecn_echo,
|
|
.sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped,
|
|
.sctp_cwnd_update_after_output = sctp_cwnd_update_after_output,
|
|
.sctp_cwnd_update_packet_transmitted = sctp_cwnd_update_rtcc_packet_transmitted,
|
|
.sctp_cwnd_update_tsn_acknowledged = sctp_cwnd_update_rtcc_tsn_acknowledged,
|
|
.sctp_cwnd_new_transmission_begins = sctp_cwnd_new_rtcc_transmission_begins,
|
|
.sctp_cwnd_prepare_net_for_sack = sctp_cwnd_prepare_rtcc_net_for_sack,
|
|
.sctp_cwnd_socket_option = sctp_cwnd_rtcc_socket_option,
|
|
.sctp_rtt_calculated = sctp_rtt_rtcc_calculated
|
|
}
|
|
};
|