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Quelle sctp_cc_functions.cSprache: C |
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/*- * 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_o 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, ui 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_rtt 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 @@@ Do something } else if (sctp_cmt_on_off == 0 && asoc->fast_retran_loss_recovery && w */ #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 *n #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(<ls); timevalsub(<ls, &net->cc_mod.rtcc.tls); net->cc_mod.rtcc.new_tot_time = (ltls.tv_sec * 1000000) + ltls.tv_usec; } } static void sctp_cwnd_new_rtcc_transmission_begins(struct sctp_tcb *stcb, struct sctp_nets *net) { #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 @@@ Do something } else if (sctp_cmt_on_off == 0 && asoc->fast_retran_loss_recovery && w */ #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_tic 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_ (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.l 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->cwn /*- * 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_ 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 @@@ Do something } else if (sctp_cmt_on_off == 0 && asoc->fast_retran_loss_recovery && w */ #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 } };
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2026-08-25