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Diffstat (limited to 'netwerk/sctp/src/netinet/sctp_cc_functions.c')
-rw-r--r--netwerk/sctp/src/netinet/sctp_cc_functions.c2494
1 files changed, 2494 insertions, 0 deletions
diff --git a/netwerk/sctp/src/netinet/sctp_cc_functions.c b/netwerk/sctp/src/netinet/sctp_cc_functions.c
new file mode 100644
index 0000000000..176338a05e
--- /dev/null
+++ b/netwerk/sctp/src/netinet/sctp_cc_functions.c
@@ -0,0 +1,2494 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
+ * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
+ * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * a) Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * b) Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the distribution.
+ *
+ * c) Neither the name of Cisco Systems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <netinet/sctp_os.h>
+#include <netinet/sctp_var.h>
+#include <netinet/sctp_sysctl.h>
+#include <netinet/sctp_pcb.h>
+#include <netinet/sctp_header.h>
+#include <netinet/sctputil.h>
+#include <netinet/sctp_output.h>
+#include <netinet/sctp_input.h>
+#include <netinet/sctp_indata.h>
+#include <netinet/sctp_uio.h>
+#include <netinet/sctp_timer.h>
+#include <netinet/sctp_auth.h>
+#include <netinet/sctp_asconf.h>
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+#include <netinet/sctp_kdtrace.h>
+#endif
+
+#define SHIFT_MPTCP_MULTI_N 40
+#define SHIFT_MPTCP_MULTI_Z 16
+#define SHIFT_MPTCP_MULTI 8
+
+#ifdef KDTRACE_HOOKS
+#define __dtrace
+#else
+#define __dtrace __unused
+#endif
+
+static void
+sctp_enforce_cwnd_limit(struct sctp_association *assoc, struct sctp_nets *net)
+{
+ if ((assoc->max_cwnd > 0) &&
+ (net->cwnd > assoc->max_cwnd) &&
+ (net->cwnd > (net->mtu - sizeof(struct sctphdr)))) {
+ net->cwnd = assoc->max_cwnd;
+ if (net->cwnd < (net->mtu - sizeof(struct sctphdr))) {
+ net->cwnd = net->mtu - sizeof(struct sctphdr);
+ }
+ }
+}
+
+static void
+sctp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net)
+{
+ struct sctp_association *assoc;
+ uint32_t cwnd_in_mtu;
+
+ assoc = &stcb->asoc;
+ 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. */
+ net->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 ((assoc->max_burst > 0) && (cwnd_in_mtu > assoc->max_burst))
+ cwnd_in_mtu = assoc->max_burst;
+ net->cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu;
+ }
+ if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) ||
+ (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2)) {
+ /* In case of resource pooling initialize appropriately */
+ net->cwnd /= assoc->numnets;
+ if (net->cwnd < (net->mtu - sizeof(struct sctphdr))) {
+ net->cwnd = net->mtu - sizeof(struct sctphdr);
+ }
+ }
+ sctp_enforce_cwnd_limit(assoc, net);
+ net->ssthresh = assoc->peers_rwnd;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ SDT_PROBE5(sctp, cwnd, net, init,
+ stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net,
+ 0, net->cwnd);
+#endif
+ 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_cwnd_update_after_fr(struct sctp_tcb *stcb,
+ struct sctp_association *asoc)
+{
+ struct sctp_nets *net;
+ 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;
+ t_ucwnd_sbw = 0;
+ if ((asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) ||
+ (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2)) {
+ TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+ t_ssthresh += net->ssthresh;
+ t_cwnd += net->cwnd;
+ if (net->lastsa > 0) {
+ t_ucwnd_sbw += (uint64_t)net->cwnd / (uint64_t)net->lastsa;
+ }
+ }
+ if (t_ucwnd_sbw == 0) {
+ t_ucwnd_sbw = 1;
+ }
+ }
+
+ /*-
+ * 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;
+
+ if ((asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) ||
+ (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2)) {
+ if (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);
+ }
+ if (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2) {
+ uint32_t srtt;
+
+ srtt = net->lastsa;
+ /* lastsa>>3; we don't need to devide ...*/
+ if (srtt == 0) {
+ srtt = 1;
+ }
+ /* Short Version => Equal to Contel Version MBe */
+ net->ssthresh = (uint32_t) (((uint64_t)4 *
+ (uint64_t)net->mtu *
+ (uint64_t)net->cwnd) /
+ ((uint64_t)srtt *
+ t_ucwnd_sbw));
+ /* INCREASE FACTOR */;
+ }
+ 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 = net->cwnd / 2;
+ if (net->ssthresh < (net->mtu * 2)) {
+ net->ssthresh = 2 * net->mtu;
+ }
+ }
+ net->cwnd = net->ssthresh;
+ sctp_enforce_cwnd_limit(asoc, net);
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ SDT_PROBE5(sctp, cwnd, net, fr,
+ stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net,
+ old_cwnd, net->cwnd);
+#endif
+ 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_1);
+ 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);
+ }
+ }
+}
+
+/* Defines for instantaneous bw decisions */
+#define SCTP_INST_LOOSING 1 /* Losing to other flows */
+#define SCTP_INST_NEUTRAL 2 /* Neutral, no indication */
+#define SCTP_INST_GAINING 3 /* Gaining, step down possible */
+
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+static int
+cc_bw_same(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw,
+ uint64_t rtt_offset, uint64_t vtag, uint8_t inst_ind)
+#else
+static int
+cc_bw_same(struct sctp_tcb *stcb SCTP_UNUSED, struct sctp_nets *net, uint64_t nbw,
+ uint64_t rtt_offset, uint8_t inst_ind)
+#endif
+{
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ uint64_t oth __dtrace, probepoint __dtrace;
+#endif
+
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ probepoint = (((uint64_t)net->cwnd) << 32);
+#endif
+ if (net->rtt > net->cc_mod.rtcc.lbw_rtt + rtt_offset) {
+ /*
+ * rtt increased
+ * we don't update bw.. so we don't
+ * update the rtt either.
+ */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ /* Probe point 5 */
+ probepoint |= ((5 << 16) | 1);
+ 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);
+#endif
+ if ((net->cc_mod.rtcc.steady_step) && (inst_ind != SCTP_INST_LOOSING)) {
+ if (net->cc_mod.rtcc.last_step_state == 5)
+ net->cc_mod.rtcc.step_cnt++;
+ else
+ net->cc_mod.rtcc.step_cnt = 1;
+ net->cc_mod.rtcc.last_step_state = 5;
+ if ((net->cc_mod.rtcc.step_cnt == net->cc_mod.rtcc.steady_step) ||
+ ((net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step) &&
+ ((net->cc_mod.rtcc.step_cnt % net->cc_mod.rtcc.steady_step) == 0))) {
+ /* Try a step down */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ 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);
+#endif
+ if (net->cwnd > (4 * net->mtu)) {
+ net->cwnd -= net->mtu;
+ net->cc_mod.rtcc.vol_reduce++;
+ } else {
+ net->cc_mod.rtcc.step_cnt = 0;
+ }
+ }
+ }
+ return (1);
+ }
+ if (net->rtt < net->cc_mod.rtcc.lbw_rtt-rtt_offset) {
+ /*
+ * rtt decreased, there could be more room.
+ * we update both the bw and the rtt here to
+ * lock this in as a good step down.
+ */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ /* Probe point 6 */
+ probepoint |= ((6 << 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);
+#endif
+ if (net->cc_mod.rtcc.steady_step) {
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ 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);
+#endif
+ if ((net->cc_mod.rtcc.last_step_state == 5) &&
+ (net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step)) {
+ /* Step down worked */
+ net->cc_mod.rtcc.step_cnt = 0;
+ return (1);
+ } else {
+ net->cc_mod.rtcc.last_step_state = 6;
+ net->cc_mod.rtcc.step_cnt = 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;
+ if (inst_ind == SCTP_INST_GAINING)
+ return (1);
+ else if (inst_ind == SCTP_INST_NEUTRAL)
+ return (1);
+ else
+ return (0);
+ }
+ /* Ok bw and rtt remained the same .. no update to any
+ */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ /* Probe point 7 */
+ probepoint |= ((7 << 16) | net->cc_mod.rtcc.ret_from_eq);
+ 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);
+#endif
+ if ((net->cc_mod.rtcc.steady_step) && (inst_ind != SCTP_INST_LOOSING)) {
+ if (net->cc_mod.rtcc.last_step_state == 5)
+ net->cc_mod.rtcc.step_cnt++;
+ else
+ net->cc_mod.rtcc.step_cnt = 1;
+ net->cc_mod.rtcc.last_step_state = 5;
+ if ((net->cc_mod.rtcc.step_cnt == net->cc_mod.rtcc.steady_step) ||
+ ((net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step) &&
+ ((net->cc_mod.rtcc.step_cnt % net->cc_mod.rtcc.steady_step) == 0))) {
+ /* Try a step down */
+ if (net->cwnd > (4 * net->mtu)) {
+ net->cwnd -= net->mtu;
+ net->cc_mod.rtcc.vol_reduce++;
+ return (1);
+ } else {
+ net->cc_mod.rtcc.step_cnt = 0;
+ }
+ }
+ }
+ if (inst_ind == SCTP_INST_GAINING)
+ return (1);
+ else if (inst_ind == SCTP_INST_NEUTRAL)
+ return (1);
+ else
+ return ((int)net->cc_mod.rtcc.ret_from_eq);
+}
+
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+static int
+cc_bw_decrease(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw, uint64_t rtt_offset,
+ uint64_t vtag, uint8_t inst_ind)
+#else
+static int
+cc_bw_decrease(struct sctp_tcb *stcb SCTP_UNUSED, struct sctp_nets *net, uint64_t nbw, uint64_t rtt_offset,
+ uint8_t inst_ind)
+#endif
+{
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ uint64_t oth __dtrace, probepoint __dtrace;
+#endif
+
+ /* Bandwidth decreased.*/
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ probepoint = (((uint64_t)net->cwnd) << 32);
+#endif
+ if (net->rtt > net->cc_mod.rtcc.lbw_rtt+rtt_offset) {
+ /* rtt increased */
+ /* Did we add more */
+ if ((net->cwnd > net->cc_mod.rtcc.cwnd_at_bw_set) &&
+ (inst_ind != SCTP_INST_LOOSING)) {
+ /* We caused it maybe.. back off? */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ /* PROBE POINT 1 */
+ probepoint |= ((1 << 16) | 1);
+ 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);
+#endif
+ if (net->cc_mod.rtcc.ret_from_eq) {
+ /* Switch over to CA if we are less aggressive */
+ net->ssthresh = net->cwnd-1;
+ net->partial_bytes_acked = 0;
+ }
+ return (1);
+ }
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ /* 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);
+#endif
+ /* Someone else - fight for more? */
+ if (net->cc_mod.rtcc.steady_step) {
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ 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);
+#endif
+ /* 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 */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ /* 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);
+#endif
+ if (net->cc_mod.rtcc.steady_step) {
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ 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);
+#endif
+ 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 */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ /* 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);
+#endif
+ if (net->cc_mod.rtcc.steady_step) {
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ 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);
+#endif
+ 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);
+ }
+}
+
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+static int
+cc_bw_increase(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw, uint64_t vtag)
+#else
+static int
+cc_bw_increase(struct sctp_tcb *stcb SCTP_UNUSED, struct sctp_nets *net, uint64_t nbw)
+#endif
+{
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ uint64_t oth __dtrace, probepoint __dtrace;
+
+#endif
+ /* 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.
+ */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ /* 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);
+#endif
+ if (net->cc_mod.rtcc.steady_step) {
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ 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);
+#endif
+ 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;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ uint64_t probepoint __dtrace, rtt, vtag;
+#endif
+ 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);
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ 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;
+#endif
+ 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;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ probepoint |= ((0xb << 16) | inst_ind);
+#endif
+ } else {
+ inst_ind = net->cc_mod.rtcc.last_inst_ind;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ inst_bw = bytes_for_this_rtt / (uint64_t)(net->rtt);
+ /* Can't determine do not change */
+ probepoint |= ((0xc << 16) | inst_ind);
+#endif
+ }
+ } else {
+ inst_ind = net->cc_mod.rtcc.last_inst_ind;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ inst_bw = bytes_for_this_rtt;
+ /* Can't determine do not change */
+ probepoint |= ((0xd << 16) | inst_ind);
+#endif
+ }
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ SDT_PROBE5(sctp, cwnd, net, rttvar,
+ vtag,
+ ((nbw << 32) | inst_bw),
+ ((net->cc_mod.rtcc.lbw_rtt << 32) | rtt),
+ net->flight_size,
+ probepoint);
+#endif
+ } 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) {
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ ret = cc_bw_increase(stcb, net, nbw, vtag);
+#else
+ ret = cc_bw_increase(stcb, net, nbw);
+#endif
+ 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) {
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ ret = cc_bw_decrease(stcb, net, nbw, rtt_offset, vtag, inst_ind);
+#else
+ ret = cc_bw_decrease(stcb, net, nbw, rtt_offset, inst_ind);
+#endif
+ goto out;
+ }
+ /* If we reach here then
+ * we are in a situation where
+ * the bw stayed the same.
+ */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ ret = cc_bw_same(stcb, net, nbw, rtt_offset, vtag, inst_ind);
+#else
+ ret = cc_bw_same(stcb, net, nbw, rtt_offset, inst_ind);
+#endif
+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;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ int old_cwnd __dtrace;
+#endif
+ 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 {
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ 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);
+#endif
+ 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;
+
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ old_cwnd = net->cwnd;
+#endif
+ 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);
+ }
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ SDT_PROBE5(sctp, cwnd, net, ack,
+ stcb->asoc.my_vtag,
+ ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
+ net,
+ old_cwnd, net->cwnd);
+#endif
+ } 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;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ old_cwnd = net->cwnd;
+#endif
+ 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);
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ SDT_PROBE5(sctp, cwnd, net, ack,
+ stcb->asoc.my_vtag,
+ ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
+ net,
+ old_cwnd, net->cwnd);
+#endif
+ 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);
+ }
+ }
+ }
+}
+
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+static void
+sctp_cwnd_update_exit_pf_common(struct sctp_tcb *stcb, struct sctp_nets *net)
+#else
+static void
+sctp_cwnd_update_exit_pf_common(struct sctp_tcb *stcb SCTP_UNUSED, struct sctp_nets *net)
+#endif
+{
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ int old_cwnd __dtrace;
+
+ old_cwnd = net->cwnd;
+#endif
+ net->cwnd = net->mtu;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ SDT_PROBE5(sctp, cwnd, net, ack,
+ stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net,
+ old_cwnd, net->cwnd);
+#endif
+ 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;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ SDT_PROBE5(sctp, cwnd, net, to,
+ stcb->asoc.my_vtag,
+ ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
+ net,
+ old_cwnd, net->cwnd);
+#endif
+ 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;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ SDT_PROBE5(sctp, cwnd, net, ecn,
+ stcb->asoc.my_vtag,
+ ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
+ net,
+ old_cwnd, net->cwnd);
+#endif
+ 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 */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ SDT_PROBE5(sctp, cwnd, net, pd,
+ stcb->asoc.my_vtag,
+ ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
+ net,
+ old_cwnd, net->cwnd);
+#endif
+ 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);
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ SDT_PROBE5(sctp, cwnd, net, bl,
+ stcb->asoc.my_vtag,
+ ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
+ net,
+ old_cwnd, net->cwnd);
+#endif
+ 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(&ltls);
+ timevalsub(&ltls, &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)
+{
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ uint64_t vtag __dtrace, probepoint __dtrace;
+
+#endif
+ if (net->cc_mod.rtcc.lbw) {
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ /* 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);
+#endif
+ 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)
+{
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ uint64_t vtag __dtrace, probepoint __dtrace;
+
+#endif
+ sctp_set_initial_cc_param(stcb, net);
+ stcb->asoc.use_precise_time = 1;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+ 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);
+#endif
+ 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[] = {
+{
+#if defined(_WIN32) && !defined(__MINGW32__)
+ sctp_set_initial_cc_param,
+ sctp_cwnd_update_after_sack,
+ sctp_cwnd_update_exit_pf_common,
+ sctp_cwnd_update_after_fr,
+ sctp_cwnd_update_after_timeout,
+ sctp_cwnd_update_after_ecn_echo,
+ sctp_cwnd_update_after_packet_dropped,
+ sctp_cwnd_update_after_output,
+#else
+ .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,
+#endif
+},
+{
+#if defined(_WIN32) && !defined(__MINGW32__)
+ sctp_set_initial_cc_param,
+ sctp_hs_cwnd_update_after_sack,
+ sctp_cwnd_update_exit_pf_common,
+ sctp_hs_cwnd_update_after_fr,
+ sctp_cwnd_update_after_timeout,
+ sctp_cwnd_update_after_ecn_echo,
+ sctp_cwnd_update_after_packet_dropped,
+ sctp_cwnd_update_after_output,
+#else
+ .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,
+#endif
+},
+{
+#if defined(_WIN32) && !defined(__MINGW32__)
+ sctp_htcp_set_initial_cc_param,
+ sctp_htcp_cwnd_update_after_sack,
+ sctp_cwnd_update_exit_pf_common,
+ sctp_htcp_cwnd_update_after_fr,
+ sctp_htcp_cwnd_update_after_timeout,
+ sctp_htcp_cwnd_update_after_ecn_echo,
+ sctp_cwnd_update_after_packet_dropped,
+ sctp_cwnd_update_after_output,
+#else
+ .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,
+#endif
+},
+{
+#if defined(_WIN32) && !defined(__MINGW32__)
+ sctp_set_rtcc_initial_cc_param,
+ sctp_cwnd_update_rtcc_after_sack,
+ sctp_cwnd_update_exit_pf_common,
+ sctp_cwnd_update_after_fr,
+ sctp_cwnd_update_after_timeout,
+ sctp_cwnd_update_rtcc_after_ecn_echo,
+ sctp_cwnd_update_after_packet_dropped,
+ sctp_cwnd_update_after_output,
+ sctp_cwnd_update_rtcc_packet_transmitted,
+ sctp_cwnd_update_rtcc_tsn_acknowledged,
+ sctp_cwnd_new_rtcc_transmission_begins,
+ sctp_cwnd_prepare_rtcc_net_for_sack,
+ sctp_cwnd_rtcc_socket_option,
+ sctp_rtt_rtcc_calculated
+#else
+ .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
+#endif
+}
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-20 15:28:37 +0000