1544 lines
45 KiB
C
1544 lines
45 KiB
C
/*-
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* Copyright (c) 2001-2007, by Cisco Systems, Inc. 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 <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_cc_functions.h>
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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/*
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* We take the max of the burst limit times a MTU or the
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* INITIAL_CWND. We then limit this to 4 MTU's of sending. cwnd must
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* be at least 2 MTU.
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*/
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net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND));
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net->ssthresh = stcb->asoc.peers_rwnd;
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if (SCTP_BASE_SYSCTL(sctp_logging_level) & (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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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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/*-
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* CMT fast recovery code. Need to debug. ((sctp_cmt_on_off == 1) &&
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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) || (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 1)) {
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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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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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net->cwnd = net->ssthresh;
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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_seq - 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_seq - 1;
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}
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/*
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* Disable Nonce Sum Checking and store the
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* resync tsn
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*/
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asoc->nonce_sum_check = 0;
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asoc->nonce_resync_tsn = asoc->fast_recovery_tsn + 1;
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sctp_timer_stop(SCTP_TIMER_TYPE_SEND,
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stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_32);
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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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void
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sctp_cwnd_update_after_sack(struct sctp_tcb *stcb,
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struct sctp_association *asoc,
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int accum_moved, int reneged_all, int will_exit)
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{
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struct sctp_nets *net;
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/******************************/
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/* update cwnd and Early FR */
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/******************************/
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TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
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#ifdef JANA_CMT_FAST_RECOVERY
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/*
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* CMT fast recovery code. Need to debug.
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*/
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if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) {
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if (compare_with_wrap(asoc->last_acked_seq,
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net->fast_recovery_tsn, MAX_TSN) ||
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(asoc->last_acked_seq == net->fast_recovery_tsn) ||
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compare_with_wrap(net->pseudo_cumack, net->fast_recovery_tsn, MAX_TSN) ||
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(net->pseudo_cumack == net->fast_recovery_tsn)) {
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net->will_exit_fast_recovery = 1;
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}
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}
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#endif
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if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
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/*
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* So, first of all do we need to have a Early FR
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* timer running?
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*/
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if (((TAILQ_FIRST(&asoc->sent_queue)) &&
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(net->ref_count > 1) &&
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(net->flight_size < net->cwnd)) ||
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(reneged_all)) {
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/*
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* yes, so in this case stop it if its
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* running, and then restart it. Reneging
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* all is a special case where we want to
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* run the Early FR timer and then force the
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* last few unacked to be sent, causing us
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* to illicit a sack with gaps to force out
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* the others.
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*/
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if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
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SCTP_STAT_INCR(sctps_earlyfrstpidsck2);
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sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
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SCTP_FROM_SCTP_INDATA + SCTP_LOC_20);
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}
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SCTP_STAT_INCR(sctps_earlyfrstrid);
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sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net);
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} else {
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/* No, stop it if its running */
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if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
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SCTP_STAT_INCR(sctps_earlyfrstpidsck3);
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sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
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SCTP_FROM_SCTP_INDATA + SCTP_LOC_21);
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}
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}
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}
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/* if nothing was acked on this destination skip it */
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if (net->net_ack == 0) {
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if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
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sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK);
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}
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continue;
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}
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if (net->net_ack2 > 0) {
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/*
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* Karn's rule applies to clearing error count, this
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* is optional.
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*/
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net->error_count = 0;
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if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
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SCTP_ADDR_NOT_REACHABLE) {
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/* addr came good */
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net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE;
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net->dest_state |= SCTP_ADDR_REACHABLE;
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sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
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SCTP_RECEIVED_SACK, (void *)net, SCTP_SO_NOT_LOCKED);
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/* now was it the primary? if so restore */
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if (net->dest_state & SCTP_ADDR_WAS_PRIMARY) {
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(void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, net);
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}
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}
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/*
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* JRS 5/14/07 - If CMT PF is on and the destination
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* is in PF state, set the destination to active
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* state and set the cwnd to one or two MTU's based
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* on whether PF1 or PF2 is being used.
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*
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* Should we stop any running T3 timer here?
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*/
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if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
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SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
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((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
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net->dest_state &= ~SCTP_ADDR_PF;
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net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf);
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SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n",
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net, net->cwnd);
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/*
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* Since the cwnd value is explicitly set,
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* skip the code that updates the cwnd
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* value.
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*/
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goto skip_cwnd_update;
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}
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}
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#ifdef JANA_CMT_FAST_RECOVERY
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/*
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* CMT fast recovery code
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*/
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/*
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* if (sctp_cmt_on_off == 1 &&
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* net->fast_retran_loss_recovery &&
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* net->will_exit_fast_recovery == 0) { @@@ Do something }
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* else if (sctp_cmt_on_off == 0 &&
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* asoc->fast_retran_loss_recovery && will_exit == 0) {
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*/
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#endif
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if (asoc->fast_retran_loss_recovery && will_exit == 0 && SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) {
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/*
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* If we are in loss recovery we skip any cwnd
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* update
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*/
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goto skip_cwnd_update;
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}
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/*
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* CMT: CUC algorithm. Update cwnd if pseudo-cumack has
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* moved.
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*/
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if (accum_moved || (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && net->new_pseudo_cumack)) {
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/* If the cumulative ack moved we can proceed */
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if (net->cwnd <= net->ssthresh) {
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/* We are in slow start */
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if (net->flight_size + net->net_ack >= net->cwnd) {
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if (net->net_ack > (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable))) {
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net->cwnd += (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable));
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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->mtu,
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SCTP_CWND_LOG_FROM_SS);
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}
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} else {
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net->cwnd += net->net_ack;
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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->net_ack,
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SCTP_CWND_LOG_FROM_SS);
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}
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}
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} else {
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if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
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sctp_log_cwnd(stcb, net, net->net_ack,
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SCTP_CWND_LOG_NOADV_SS);
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}
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}
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} else {
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/* We are in congestion avoidance */
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/*
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* Add to pba
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*/
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net->partial_bytes_acked += net->net_ack;
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if ((net->flight_size + net->net_ack >= net->cwnd) &&
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(net->partial_bytes_acked >= net->cwnd)) {
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net->partial_bytes_acked -= net->cwnd;
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net->cwnd += net->mtu;
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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->mtu,
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SCTP_CWND_LOG_FROM_CA);
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}
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} else {
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if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
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sctp_log_cwnd(stcb, net, net->net_ack,
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SCTP_CWND_LOG_NOADV_CA);
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}
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}
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}
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} else {
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if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
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sctp_log_cwnd(stcb, net, net->mtu,
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SCTP_CWND_LOG_NO_CUMACK);
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}
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}
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skip_cwnd_update:
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/*
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* NOW, according to Karn's rule do we need to restore the
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* RTO timer back? Check our net_ack2. If not set then we
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* have a ambiguity.. i.e. all data ack'd was sent to more
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* than one place.
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*/
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if (net->net_ack2) {
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/* restore any doubled timers */
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net->RTO = ((net->lastsa >> 2) + net->lastsv) >> 1;
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if (net->RTO < stcb->asoc.minrto) {
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net->RTO = stcb->asoc.minrto;
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}
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if (net->RTO > stcb->asoc.maxrto) {
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net->RTO = stcb->asoc.maxrto;
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}
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}
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}
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}
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void
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sctp_cwnd_update_after_timeout(struct sctp_tcb *stcb, struct sctp_nets *net)
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{
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int old_cwnd = net->cwnd;
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net->ssthresh = max(net->cwnd / 2, 4 * net->mtu);
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net->cwnd = net->mtu;
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net->partial_bytes_acked = 0;
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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, SCTP_CWND_LOG_FROM_RTX);
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}
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}
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void
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sctp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net)
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{
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int old_cwnd = net->cwnd;
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SCTP_STAT_INCR(sctps_ecnereducedcwnd);
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net->ssthresh = net->cwnd / 2;
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if (net->ssthresh < net->mtu) {
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net->ssthresh = net->mtu;
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/* here back off the timer as well, to slow us down */
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net->RTO <<= 1;
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}
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net->cwnd = net->ssthresh;
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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), SCTP_CWND_LOG_FROM_SAT);
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}
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}
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void
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sctp_cwnd_update_after_packet_dropped(struct sctp_tcb *stcb,
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struct sctp_nets *net, struct sctp_pktdrop_chunk *cp,
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uint32_t * bottle_bw, uint32_t * on_queue)
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{
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uint32_t bw_avail;
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int rtt, incr;
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int old_cwnd = net->cwnd;
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/* need real RTT for this calc */
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rtt = ((net->lastsa >> 2) + net->lastsv) >> 1;
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/* get bottle neck bw */
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*bottle_bw = ntohl(cp->bottle_bw);
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/* and whats on queue */
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*on_queue = ntohl(cp->current_onq);
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/*
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* adjust the on-queue if our flight is more it could be that the
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* router has not yet gotten data "in-flight" to it
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*/
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if (*on_queue < net->flight_size)
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*on_queue = net->flight_size;
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/* calculate the available space */
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bw_avail = (*bottle_bw * rtt) / 1000;
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if (bw_avail > *bottle_bw) {
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/*
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* Cap the growth to no more than the bottle neck. This can
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* happen as RTT slides up due to queues. It also means if
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* you have more than a 1 second RTT with a empty queue you
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* will be limited to the bottle_bw per second no matter if
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* other points have 1/2 the RTT and you could get more
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* out...
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*/
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bw_avail = *bottle_bw;
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}
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if (*on_queue > bw_avail) {
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/*
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* No room for anything else don't allow anything else to be
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* "added to the fire".
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*/
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int seg_inflight, seg_onqueue, my_portion;
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net->partial_bytes_acked = 0;
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|
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/* how much are we over queue size? */
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incr = *on_queue - bw_avail;
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if (stcb->asoc.seen_a_sack_this_pkt) {
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/*
|
|
* 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 = min((bw_avail - *on_queue) >> 2,
|
|
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;
|
|
}
|
|
if (net->cwnd - old_cwnd != 0) {
|
|
/* log only changes */
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
net->cwnd = (net->flight_size + (burst_limit * 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_BRST);
|
|
}
|
|
}
|
|
|
|
void
|
|
sctp_cwnd_update_after_fr_timer(struct sctp_inpcb *inp,
|
|
struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
int old_cwnd = net->cwnd;
|
|
|
|
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_EARLY_FR_TMR, SCTP_SO_NOT_LOCKED);
|
|
/*
|
|
* make a small adjustment to cwnd and force to CA.
|
|
*/
|
|
if (net->cwnd > net->mtu)
|
|
/* drop down one MTU after sending */
|
|
net->cwnd -= net->mtu;
|
|
if (net->cwnd < net->ssthresh)
|
|
/* still in SS move to CA */
|
|
net->ssthresh = net->cwnd - 1;
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, (old_cwnd - net->cwnd), SCTP_CWND_LOG_FROM_FR);
|
|
}
|
|
}
|
|
|
|
struct sctp_hs_raise_drop {
|
|
int32_t cwnd;
|
|
int32_t increase;
|
|
int32_t drop_percent;
|
|
};
|
|
|
|
#define SCTP_HS_TABLE_SIZE 73
|
|
|
|
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;
|
|
|
|
cur_val = net->cwnd >> 10;
|
|
indx = SCTP_HS_TABLE_SIZE - 1;
|
|
#ifdef SCTP_DEBUG
|
|
printf("HS CC CAlled.\n");
|
|
#endif
|
|
if (cur_val < sctp_cwnd_adjust[0].cwnd) {
|
|
/* normal mode */
|
|
if (net->net_ack > net->mtu) {
|
|
net->cwnd += net->mtu;
|
|
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);
|
|
}
|
|
}
|
|
} 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 = ((sctp_cwnd_adjust[indx].increase) << 10);
|
|
net->cwnd += incr;
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, incr, 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;
|
|
indx = net->last_hs_used;
|
|
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) *
|
|
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;
|
|
}
|
|
}
|
|
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);
|
|
}
|
|
}
|
|
|
|
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 == 1) &&
|
|
* (net->fast_retran_loss_recovery == 0)))
|
|
*/
|
|
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
|
|
if ((asoc->fast_retran_loss_recovery == 0) || (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 1)) {
|
|
/* 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_seq - 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_seq - 1;
|
|
}
|
|
|
|
/*
|
|
* Disable Nonce Sum Checking and store the
|
|
* resync tsn
|
|
*/
|
|
asoc->nonce_sum_check = 0;
|
|
asoc->nonce_resync_tsn = asoc->fast_recovery_tsn + 1;
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_SEND,
|
|
stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_32);
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
sctp_hs_cwnd_update_after_sack(struct sctp_tcb *stcb,
|
|
struct sctp_association *asoc,
|
|
int accum_moved, int reneged_all, 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 (compare_with_wrap(asoc->last_acked_seq,
|
|
net->fast_recovery_tsn, MAX_TSN) ||
|
|
(asoc->last_acked_seq == net->fast_recovery_tsn) ||
|
|
compare_with_wrap(net->pseudo_cumack, net->fast_recovery_tsn, MAX_TSN) ||
|
|
(net->pseudo_cumack == net->fast_recovery_tsn)) {
|
|
net->will_exit_fast_recovery = 1;
|
|
}
|
|
}
|
|
#endif
|
|
if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
|
|
/*
|
|
* So, first of all do we need to have a Early FR
|
|
* timer running?
|
|
*/
|
|
if (((TAILQ_FIRST(&asoc->sent_queue)) &&
|
|
(net->ref_count > 1) &&
|
|
(net->flight_size < net->cwnd)) ||
|
|
(reneged_all)) {
|
|
/*
|
|
* yes, so in this case stop it if its
|
|
* running, and then restart it. Reneging
|
|
* all is a special case where we want to
|
|
* run the Early FR timer and then force the
|
|
* last few unacked to be sent, causing us
|
|
* to illicit a sack with gaps to force out
|
|
* the others.
|
|
*/
|
|
if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
|
|
SCTP_STAT_INCR(sctps_earlyfrstpidsck2);
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
|
|
SCTP_FROM_SCTP_INDATA + SCTP_LOC_20);
|
|
}
|
|
SCTP_STAT_INCR(sctps_earlyfrstrid);
|
|
sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net);
|
|
} else {
|
|
/* No, stop it if its running */
|
|
if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
|
|
SCTP_STAT_INCR(sctps_earlyfrstpidsck3);
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
|
|
SCTP_FROM_SCTP_INDATA + SCTP_LOC_21);
|
|
}
|
|
}
|
|
}
|
|
/* 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;
|
|
}
|
|
if (net->net_ack2 > 0) {
|
|
/*
|
|
* Karn's rule applies to clearing error count, this
|
|
* is optional.
|
|
*/
|
|
net->error_count = 0;
|
|
if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
|
|
SCTP_ADDR_NOT_REACHABLE) {
|
|
/* addr came good */
|
|
net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE;
|
|
net->dest_state |= SCTP_ADDR_REACHABLE;
|
|
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
|
|
SCTP_RECEIVED_SACK, (void *)net, SCTP_SO_NOT_LOCKED);
|
|
/* now was it the primary? if so restore */
|
|
if (net->dest_state & SCTP_ADDR_WAS_PRIMARY) {
|
|
(void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, net);
|
|
}
|
|
}
|
|
/*
|
|
* JRS 5/14/07 - If CMT PF is on and the destination
|
|
* is in PF state, set the destination to active
|
|
* state and set the cwnd to one or two MTU's based
|
|
* on whether PF1 or PF2 is being used.
|
|
*
|
|
* Should we stop any running T3 timer here?
|
|
*/
|
|
if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
|
|
SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
|
|
((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
|
|
net->dest_state &= ~SCTP_ADDR_PF;
|
|
net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf);
|
|
SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n",
|
|
net, net->cwnd);
|
|
/*
|
|
* Since the cwnd value is explicitly set,
|
|
* skip the code that updates the cwnd
|
|
* value.
|
|
*/
|
|
goto skip_cwnd_update;
|
|
}
|
|
}
|
|
#ifdef JANA_CMT_FAST_RECOVERY
|
|
/*
|
|
* CMT fast recovery code
|
|
*/
|
|
/*
|
|
* if (sctp_cmt_on_off == 1 &&
|
|
* 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 && SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) {
|
|
/*
|
|
* If we are in loss recovery we skip any cwnd
|
|
* update
|
|
*/
|
|
goto skip_cwnd_update;
|
|
}
|
|
/*
|
|
* CMT: CUC algorithm. Update cwnd if pseudo-cumack has
|
|
* moved.
|
|
*/
|
|
if (accum_moved || (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && 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;
|
|
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);
|
|
}
|
|
}
|
|
skip_cwnd_update:
|
|
/*
|
|
* NOW, according to Karn's rule do we need to restore the
|
|
* RTO timer back? Check our net_ack2. If not set then we
|
|
* have a ambiguity.. i.e. all data ack'd was sent to more
|
|
* than one place.
|
|
*/
|
|
if (net->net_ack2) {
|
|
/* restore any doubled timers */
|
|
net->RTO = ((net->lastsa >> 2) + net->lastsv) >> 1;
|
|
if (net->RTO < stcb->asoc.minrto) {
|
|
net->RTO = stcb->asoc.minrto;
|
|
}
|
|
if (net->RTO > stcb->asoc.maxrto) {
|
|
net->RTO = stcb->asoc.maxrto;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 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->htcp_ca.last_cong = net->htcp_ca.undo_last_cong;
|
|
net->htcp_ca.maxRTT = net->htcp_ca.undo_maxRTT;
|
|
net->htcp_ca.old_maxB = net->htcp_ca.undo_old_maxB;
|
|
return max(net->cwnd, ((net->ssthresh / net->mtu << 7) / net->htcp_ca.beta) * net->mtu);
|
|
}
|
|
|
|
#endif
|
|
|
|
static inline void
|
|
measure_rtt(struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
uint32_t srtt = net->lastsa >> 3;
|
|
|
|
/* keep track of minimum RTT seen so far, minRTT is zero at first */
|
|
if (net->htcp_ca.minRTT > srtt || !net->htcp_ca.minRTT)
|
|
net->htcp_ca.minRTT = srtt;
|
|
|
|
/* max RTT */
|
|
if (net->fast_retran_ip == 0 && net->ssthresh < 0xFFFF && htcp_ccount(&net->htcp_ca) > 3) {
|
|
if (net->htcp_ca.maxRTT < net->htcp_ca.minRTT)
|
|
net->htcp_ca.maxRTT = net->htcp_ca.minRTT;
|
|
if (net->htcp_ca.maxRTT < srtt && srtt <= net->htcp_ca.maxRTT + MSEC_TO_TICKS(20))
|
|
net->htcp_ca.maxRTT = srtt;
|
|
}
|
|
}
|
|
|
|
static void
|
|
measure_achieved_throughput(struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
uint32_t now = sctp_get_tick_count();
|
|
|
|
if (net->fast_retran_ip == 0)
|
|
net->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->htcp_ca.bytecount = 0;
|
|
net->htcp_ca.lasttime = now;
|
|
return;
|
|
}
|
|
net->htcp_ca.bytecount += net->net_ack;
|
|
|
|
if (net->htcp_ca.bytecount >= net->cwnd - ((net->htcp_ca.alpha >> 7 ? : 1) * net->mtu)
|
|
&& now - net->htcp_ca.lasttime >= net->htcp_ca.minRTT
|
|
&& net->htcp_ca.minRTT > 0) {
|
|
uint32_t cur_Bi = net->htcp_ca.bytecount / net->mtu * hz / (now - net->htcp_ca.lasttime);
|
|
|
|
if (htcp_ccount(&net->htcp_ca) <= 3) {
|
|
/* just after backoff */
|
|
net->htcp_ca.minB = net->htcp_ca.maxB = net->htcp_ca.Bi = cur_Bi;
|
|
} else {
|
|
net->htcp_ca.Bi = (3 * net->htcp_ca.Bi + cur_Bi) / 4;
|
|
if (net->htcp_ca.Bi > net->htcp_ca.maxB)
|
|
net->htcp_ca.maxB = net->htcp_ca.Bi;
|
|
if (net->htcp_ca.minB > net->htcp_ca.maxB)
|
|
net->htcp_ca.minB = net->htcp_ca.maxB;
|
|
}
|
|
net->htcp_ca.bytecount = 0;
|
|
net->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 > (uint32_t) MSEC_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)
|
|
factor = 1;
|
|
}
|
|
ca->alpha = 2 * factor * ((1 << 7) - ca->beta);
|
|
if (!ca->alpha)
|
|
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_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
uint32_t minRTT = net->htcp_ca.minRTT;
|
|
uint32_t maxRTT = net->htcp_ca.maxRTT;
|
|
|
|
htcp_beta_update(&net->htcp_ca, minRTT, maxRTT);
|
|
htcp_alpha_update(&net->htcp_ca);
|
|
|
|
/*
|
|
* add slowly fading memory for maxRTT to accommodate routing
|
|
* changes etc
|
|
*/
|
|
if (minRTT > 0 && maxRTT > minRTT)
|
|
net->htcp_ca.maxRTT = minRTT + ((maxRTT - minRTT) * 95) / 100;
|
|
}
|
|
|
|
static uint32_t
|
|
htcp_recalc_ssthresh(struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
htcp_param_update(stcb, net);
|
|
return max(((net->cwnd / net->mtu * net->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);
|
|
}
|
|
}
|
|
} 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(stcb, 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->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;
|
|
htcp_alpha_update(&net->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->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_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
memset(&net->htcp_ca, 0, sizeof(struct htcp));
|
|
net->htcp_ca.alpha = ALPHA_BASE;
|
|
net->htcp_ca.beta = BETA_MIN;
|
|
net->htcp_ca.bytes_acked = net->mtu;
|
|
net->htcp_ca.last_cong = sctp_get_tick_count();
|
|
}
|
|
|
|
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;
|
|
htcp_init(stcb, 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);
|
|
}
|
|
}
|
|
|
|
void
|
|
sctp_htcp_cwnd_update_after_sack(struct sctp_tcb *stcb,
|
|
struct sctp_association *asoc,
|
|
int accum_moved, int reneged_all, 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 (compare_with_wrap(asoc->last_acked_seq,
|
|
net->fast_recovery_tsn, MAX_TSN) ||
|
|
(asoc->last_acked_seq == net->fast_recovery_tsn) ||
|
|
compare_with_wrap(net->pseudo_cumack, net->fast_recovery_tsn, MAX_TSN) ||
|
|
(net->pseudo_cumack == net->fast_recovery_tsn)) {
|
|
net->will_exit_fast_recovery = 1;
|
|
}
|
|
}
|
|
#endif
|
|
if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
|
|
/*
|
|
* So, first of all do we need to have a Early FR
|
|
* timer running?
|
|
*/
|
|
if (((TAILQ_FIRST(&asoc->sent_queue)) &&
|
|
(net->ref_count > 1) &&
|
|
(net->flight_size < net->cwnd)) ||
|
|
(reneged_all)) {
|
|
/*
|
|
* yes, so in this case stop it if its
|
|
* running, and then restart it. Reneging
|
|
* all is a special case where we want to
|
|
* run the Early FR timer and then force the
|
|
* last few unacked to be sent, causing us
|
|
* to illicit a sack with gaps to force out
|
|
* the others.
|
|
*/
|
|
if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
|
|
SCTP_STAT_INCR(sctps_earlyfrstpidsck2);
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
|
|
SCTP_FROM_SCTP_INDATA + SCTP_LOC_20);
|
|
}
|
|
SCTP_STAT_INCR(sctps_earlyfrstrid);
|
|
sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net);
|
|
} else {
|
|
/* No, stop it if its running */
|
|
if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
|
|
SCTP_STAT_INCR(sctps_earlyfrstpidsck3);
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
|
|
SCTP_FROM_SCTP_INDATA + SCTP_LOC_21);
|
|
}
|
|
}
|
|
}
|
|
/* 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;
|
|
}
|
|
if (net->net_ack2 > 0) {
|
|
/*
|
|
* Karn's rule applies to clearing error count, this
|
|
* is optional.
|
|
*/
|
|
net->error_count = 0;
|
|
if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
|
|
SCTP_ADDR_NOT_REACHABLE) {
|
|
/* addr came good */
|
|
net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE;
|
|
net->dest_state |= SCTP_ADDR_REACHABLE;
|
|
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
|
|
SCTP_RECEIVED_SACK, (void *)net, SCTP_SO_NOT_LOCKED);
|
|
/* now was it the primary? if so restore */
|
|
if (net->dest_state & SCTP_ADDR_WAS_PRIMARY) {
|
|
(void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, net);
|
|
}
|
|
}
|
|
/*
|
|
* JRS 5/14/07 - If CMT PF is on and the destination
|
|
* is in PF state, set the destination to active
|
|
* state and set the cwnd to one or two MTU's based
|
|
* on whether PF1 or PF2 is being used.
|
|
*
|
|
* Should we stop any running T3 timer here?
|
|
*/
|
|
if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
|
|
SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
|
|
((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
|
|
net->dest_state &= ~SCTP_ADDR_PF;
|
|
net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf);
|
|
SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n",
|
|
net, net->cwnd);
|
|
/*
|
|
* Since the cwnd value is explicitly set,
|
|
* skip the code that updates the cwnd
|
|
* value.
|
|
*/
|
|
goto skip_cwnd_update;
|
|
}
|
|
}
|
|
#ifdef JANA_CMT_FAST_RECOVERY
|
|
/*
|
|
* CMT fast recovery code
|
|
*/
|
|
/*
|
|
* if (sctp_cmt_on_off == 1 &&
|
|
* 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 && SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) {
|
|
/*
|
|
* If we are in loss recovery we skip any cwnd
|
|
* update
|
|
*/
|
|
goto skip_cwnd_update;
|
|
}
|
|
/*
|
|
* CMT: CUC algorithm. Update cwnd if pseudo-cumack has
|
|
* moved.
|
|
*/
|
|
if (accum_moved || (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && net->new_pseudo_cumack)) {
|
|
htcp_cong_avoid(stcb, net);
|
|
measure_achieved_throughput(stcb, 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);
|
|
}
|
|
}
|
|
skip_cwnd_update:
|
|
/*
|
|
* NOW, according to Karn's rule do we need to restore the
|
|
* RTO timer back? Check our net_ack2. If not set then we
|
|
* have a ambiguity.. i.e. all data ack'd was sent to more
|
|
* than one place.
|
|
*/
|
|
if (net->net_ack2) {
|
|
/* restore any doubled timers */
|
|
net->RTO = ((net->lastsa >> 2) + net->lastsv) >> 1;
|
|
if (net->RTO < stcb->asoc.minrto) {
|
|
net->RTO = stcb->asoc.minrto;
|
|
}
|
|
if (net->RTO > stcb->asoc.maxrto) {
|
|
net->RTO = stcb->asoc.maxrto;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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 == 1) &&
|
|
* (net->fast_retran_loss_recovery == 0)))
|
|
*/
|
|
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
|
|
if ((asoc->fast_retran_loss_recovery == 0) || (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 1)) {
|
|
/* 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->htcp_ca);
|
|
net->ssthresh = htcp_recalc_ssthresh(stcb, net);
|
|
net->cwnd = net->ssthresh;
|
|
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_seq - 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_seq - 1;
|
|
}
|
|
|
|
/*
|
|
* Disable Nonce Sum Checking and store the
|
|
* resync tsn
|
|
*/
|
|
asoc->nonce_sum_check = 0;
|
|
asoc->nonce_resync_tsn = asoc->fast_recovery_tsn + 1;
|
|
|
|
sctp_timer_stop(SCTP_TIMER_TYPE_SEND,
|
|
stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_32);
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
|
|
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->htcp_ca);
|
|
net->ssthresh = htcp_recalc_ssthresh(stcb, 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);
|
|
}
|
|
}
|
|
|
|
void
|
|
sctp_htcp_cwnd_update_after_fr_timer(struct sctp_inpcb *inp,
|
|
struct sctp_tcb *stcb, struct sctp_nets *net)
|
|
{
|
|
int old_cwnd;
|
|
|
|
old_cwnd = net->cwnd;
|
|
|
|
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_EARLY_FR_TMR, SCTP_SO_NOT_LOCKED);
|
|
net->htcp_ca.last_cong = sctp_get_tick_count();
|
|
/*
|
|
* make a small adjustment to cwnd and force to CA.
|
|
*/
|
|
if (net->cwnd > net->mtu)
|
|
/* drop down one MTU after sending */
|
|
net->cwnd -= net->mtu;
|
|
if (net->cwnd < net->ssthresh)
|
|
/* still in SS move to CA */
|
|
net->ssthresh = net->cwnd - 1;
|
|
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
|
|
sctp_log_cwnd(stcb, net, (old_cwnd - net->cwnd), SCTP_CWND_LOG_FROM_FR);
|
|
}
|
|
}
|
|
|
|
void
|
|
sctp_htcp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb,
|
|
struct sctp_nets *net)
|
|
{
|
|
int old_cwnd;
|
|
|
|
old_cwnd = net->cwnd;
|
|
|
|
/* JRS - reset hctp as if state changed */
|
|
htcp_reset(&net->htcp_ca);
|
|
SCTP_STAT_INCR(sctps_ecnereducedcwnd);
|
|
net->ssthresh = htcp_recalc_ssthresh(stcb, 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;
|
|
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);
|
|
}
|
|
}
|