sctp_cc_functions.c revision 310218
1171440Srrs/*- 2171440Srrs * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3235828Stuexen * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4235828Stuexen * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5171440Srrs * 6171440Srrs * Redistribution and use in source and binary forms, with or without 7171440Srrs * modification, are permitted provided that the following conditions are met: 8171440Srrs * 9171440Srrs * a) Redistributions of source code must retain the above copyright notice, 10228653Stuexen * this list of conditions and the following disclaimer. 11171440Srrs * 12171440Srrs * b) Redistributions in binary form must reproduce the above copyright 13171440Srrs * notice, this list of conditions and the following disclaimer in 14228653Stuexen * the documentation and/or other materials provided with the distribution. 15171440Srrs * 16171440Srrs * c) Neither the name of Cisco Systems, Inc. nor the names of its 17171440Srrs * contributors may be used to endorse or promote products derived 18171440Srrs * from this software without specific prior written permission. 19171440Srrs * 20171440Srrs * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21171440Srrs * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22171440Srrs * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23171440Srrs * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24171440Srrs * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25171440Srrs * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26171440Srrs * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27171440Srrs * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28171440Srrs * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29171440Srrs * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30171440Srrs * THE POSSIBILITY OF SUCH DAMAGE. 31171440Srrs */ 32171440Srrs 33235828Stuexen#include <sys/cdefs.h> 34235828Stuexen__FBSDID("$FreeBSD: stable/11/sys/netinet/sctp_cc_functions.c 310218 2016-12-18 13:00:11Z tuexen $"); 35235828Stuexen 36171440Srrs#include <netinet/sctp_os.h> 37171440Srrs#include <netinet/sctp_var.h> 38171440Srrs#include <netinet/sctp_sysctl.h> 39171440Srrs#include <netinet/sctp_pcb.h> 40171440Srrs#include <netinet/sctp_header.h> 41171440Srrs#include <netinet/sctputil.h> 42171440Srrs#include <netinet/sctp_output.h> 43171440Srrs#include <netinet/sctp_input.h> 44171440Srrs#include <netinet/sctp_indata.h> 45171440Srrs#include <netinet/sctp_uio.h> 46171440Srrs#include <netinet/sctp_timer.h> 47171440Srrs#include <netinet/sctp_auth.h> 48171440Srrs#include <netinet/sctp_asconf.h> 49215817Srrs#include <netinet/sctp_dtrace_declare.h> 50212800Stuexen 51221460Stuexen#define SHIFT_MPTCP_MULTI_N 40 52221460Stuexen#define SHIFT_MPTCP_MULTI_Z 16 53221460Stuexen#define SHIFT_MPTCP_MULTI 8 54221460Stuexen 55217611Stuexenstatic void 56279859Stuexensctp_enforce_cwnd_limit(struct sctp_association *assoc, struct sctp_nets *net) 57279859Stuexen{ 58279859Stuexen if ((assoc->max_cwnd > 0) && 59279859Stuexen (net->cwnd > assoc->max_cwnd) && 60279859Stuexen (net->cwnd > (net->mtu - sizeof(struct sctphdr)))) { 61279859Stuexen net->cwnd = assoc->max_cwnd; 62279859Stuexen if (net->cwnd < (net->mtu - sizeof(struct sctphdr))) { 63279859Stuexen net->cwnd = net->mtu - sizeof(struct sctphdr); 64279859Stuexen } 65279859Stuexen } 66279859Stuexen} 67279859Stuexen 68279859Stuexenstatic void 69171440Srrssctp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net) 70171440Srrs{ 71212800Stuexen struct sctp_association *assoc; 72212800Stuexen uint32_t cwnd_in_mtu; 73212800Stuexen 74212800Stuexen assoc = &stcb->asoc; 75212800Stuexen cwnd_in_mtu = SCTP_BASE_SYSCTL(sctp_initial_cwnd); 76216672Stuexen if (cwnd_in_mtu == 0) { 77216672Stuexen /* Using 0 means that the value of RFC 4960 is used. */ 78216672Stuexen net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND)); 79216672Stuexen } else { 80216672Stuexen /* 81216672Stuexen * We take the minimum of the burst limit and the initial 82216672Stuexen * congestion window. 83216672Stuexen */ 84216672Stuexen if ((assoc->max_burst > 0) && (cwnd_in_mtu > assoc->max_burst)) 85216672Stuexen cwnd_in_mtu = assoc->max_burst; 86216672Stuexen net->cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu; 87216672Stuexen } 88221460Stuexen if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) || 89221460Stuexen (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2)) { 90217469Stuexen /* In case of resource pooling initialize appropriately */ 91217469Stuexen net->cwnd /= assoc->numnets; 92217469Stuexen if (net->cwnd < (net->mtu - sizeof(struct sctphdr))) { 93217469Stuexen net->cwnd = net->mtu - sizeof(struct sctphdr); 94217469Stuexen } 95217469Stuexen } 96279859Stuexen sctp_enforce_cwnd_limit(assoc, net); 97212800Stuexen net->ssthresh = assoc->peers_rwnd; 98292384Smarkj SDT_PROBE5(sctp, cwnd, net, init, 99215817Srrs stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net, 100215817Srrs 0, net->cwnd); 101212800Stuexen if (SCTP_BASE_SYSCTL(sctp_logging_level) & 102212800Stuexen (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 103171440Srrs sctp_log_cwnd(stcb, net, 0, SCTP_CWND_INITIALIZATION); 104171440Srrs } 105171440Srrs} 106171440Srrs 107217611Stuexenstatic void 108171440Srrssctp_cwnd_update_after_fr(struct sctp_tcb *stcb, 109171440Srrs struct sctp_association *asoc) 110171440Srrs{ 111171440Srrs struct sctp_nets *net; 112217469Stuexen uint32_t t_ssthresh, t_cwnd; 113221460Stuexen uint64_t t_ucwnd_sbw; 114171440Srrs 115217469Stuexen /* MT FIXME: Don't compute this over and over again */ 116217469Stuexen t_ssthresh = 0; 117217469Stuexen t_cwnd = 0; 118221460Stuexen t_ucwnd_sbw = 0; 119221460Stuexen if ((asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) || 120221460Stuexen (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2)) { 121217469Stuexen TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 122217469Stuexen t_ssthresh += net->ssthresh; 123217469Stuexen t_cwnd += net->cwnd; 124221460Stuexen if (net->lastsa > 0) { 125221460Stuexen t_ucwnd_sbw += (uint64_t) net->cwnd / (uint64_t) net->lastsa; 126221460Stuexen } 127217469Stuexen } 128221460Stuexen if (t_ucwnd_sbw == 0) { 129221460Stuexen t_ucwnd_sbw = 1; 130221460Stuexen } 131217469Stuexen } 132171440Srrs /*- 133216669Stuexen * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) && 134171440Srrs * (net->fast_retran_loss_recovery == 0))) 135171440Srrs */ 136171440Srrs TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 137211944Stuexen if ((asoc->fast_retran_loss_recovery == 0) || 138216669Stuexen (asoc->sctp_cmt_on_off > 0)) { 139171440Srrs /* out of a RFC2582 Fast recovery window? */ 140171440Srrs if (net->net_ack > 0) { 141171440Srrs /* 142171440Srrs * per section 7.2.3, are there any 143171440Srrs * destinations that had a fast retransmit 144171440Srrs * to them. If so what we need to do is 145171440Srrs * adjust ssthresh and cwnd. 146171440Srrs */ 147171440Srrs struct sctp_tmit_chunk *lchk; 148171440Srrs int old_cwnd = net->cwnd; 149171440Srrs 150221460Stuexen if ((asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) || 151221460Stuexen (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2)) { 152221460Stuexen if (asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) { 153221460Stuexen net->ssthresh = (uint32_t) (((uint64_t) 4 * 154221460Stuexen (uint64_t) net->mtu * 155221460Stuexen (uint64_t) net->ssthresh) / 156221460Stuexen (uint64_t) t_ssthresh); 157221460Stuexen 158221460Stuexen } 159221460Stuexen if (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2) { 160221460Stuexen uint32_t srtt; 161221460Stuexen 162221460Stuexen srtt = net->lastsa; 163310218Stuexen /* lastsa>>3; we don't need 164310218Stuexen * to devide ... */ 165221460Stuexen if (srtt == 0) { 166221460Stuexen srtt = 1; 167221460Stuexen } 168310218Stuexen /* Short Version => Equal to 169310218Stuexen * Contel Version MBe */ 170221460Stuexen net->ssthresh = (uint32_t) (((uint64_t) 4 * 171221460Stuexen (uint64_t) net->mtu * 172221460Stuexen (uint64_t) net->cwnd) / 173221460Stuexen ((uint64_t) srtt * 174221460Stuexen t_ucwnd_sbw)); 175221460Stuexen /* INCREASE FACTOR */ ; 176221460Stuexen } 177217469Stuexen if ((net->cwnd > t_cwnd / 2) && 178217469Stuexen (net->ssthresh < net->cwnd - t_cwnd / 2)) { 179217469Stuexen net->ssthresh = net->cwnd - t_cwnd / 2; 180217469Stuexen } 181217469Stuexen if (net->ssthresh < net->mtu) { 182217469Stuexen net->ssthresh = net->mtu; 183217469Stuexen } 184217469Stuexen } else { 185217469Stuexen net->ssthresh = net->cwnd / 2; 186217469Stuexen if (net->ssthresh < (net->mtu * 2)) { 187217469Stuexen net->ssthresh = 2 * net->mtu; 188217469Stuexen } 189171440Srrs } 190171440Srrs net->cwnd = net->ssthresh; 191279859Stuexen sctp_enforce_cwnd_limit(asoc, net); 192292384Smarkj SDT_PROBE5(sctp, cwnd, net, fr, 193215817Srrs stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net, 194215817Srrs old_cwnd, net->cwnd); 195179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 196171440Srrs sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), 197171440Srrs SCTP_CWND_LOG_FROM_FR); 198171440Srrs } 199171440Srrs lchk = TAILQ_FIRST(&asoc->send_queue); 200171440Srrs 201171440Srrs net->partial_bytes_acked = 0; 202171440Srrs /* Turn on fast recovery window */ 203171440Srrs asoc->fast_retran_loss_recovery = 1; 204171440Srrs if (lchk == NULL) { 205171440Srrs /* Mark end of the window */ 206171440Srrs asoc->fast_recovery_tsn = asoc->sending_seq - 1; 207171440Srrs } else { 208171440Srrs asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; 209171440Srrs } 210171440Srrs 211171440Srrs /* 212171440Srrs * CMT fast recovery -- per destination 213171440Srrs * recovery variable. 214171440Srrs */ 215171440Srrs net->fast_retran_loss_recovery = 1; 216171440Srrs 217171440Srrs if (lchk == NULL) { 218171440Srrs /* Mark end of the window */ 219171440Srrs net->fast_recovery_tsn = asoc->sending_seq - 1; 220171440Srrs } else { 221171440Srrs net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; 222171440Srrs } 223171440Srrs 224171440Srrs sctp_timer_stop(SCTP_TIMER_TYPE_SEND, 225283650Stuexen stcb->sctp_ep, stcb, net, 226283650Stuexen SCTP_FROM_SCTP_CC_FUNCTIONS + SCTP_LOC_1); 227171440Srrs sctp_timer_start(SCTP_TIMER_TYPE_SEND, 228171440Srrs stcb->sctp_ep, stcb, net); 229171440Srrs } 230171440Srrs } else if (net->net_ack > 0) { 231171440Srrs /* 232171440Srrs * Mark a peg that we WOULD have done a cwnd 233171440Srrs * reduction but RFC2582 prevented this action. 234171440Srrs */ 235171440Srrs SCTP_STAT_INCR(sctps_fastretransinrtt); 236171440Srrs } 237171440Srrs } 238171440Srrs} 239171440Srrs 240219397Srrs/* Defines for instantaneous bw decisions */ 241298942Spfg#define SCTP_INST_LOOSING 1 /* Losing to other flows */ 242219397Srrs#define SCTP_INST_NEUTRAL 2 /* Neutral, no indication */ 243219397Srrs#define SCTP_INST_GAINING 3 /* Gaining, step down possible */ 244219120Srrs 245219397Srrs 246219397Srrsstatic int 247219397Srrscc_bw_same(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw, 248219397Srrs uint64_t rtt_offset, uint64_t vtag, uint8_t inst_ind) 249219397Srrs{ 250219397Srrs uint64_t oth, probepoint; 251219397Srrs 252219397Srrs probepoint = (((uint64_t) net->cwnd) << 32); 253219397Srrs if (net->rtt > net->cc_mod.rtcc.lbw_rtt + rtt_offset) { 254219397Srrs /* 255219397Srrs * rtt increased we don't update bw.. so we don't update the 256219397Srrs * rtt either. 257219397Srrs */ 258219397Srrs /* Probe point 5 */ 259219397Srrs probepoint |= ((5 << 16) | 1); 260292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttvar, 261219397Srrs vtag, 262219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 263219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 264219397Srrs net->flight_size, 265219397Srrs probepoint); 266219397Srrs if ((net->cc_mod.rtcc.steady_step) && (inst_ind != SCTP_INST_LOOSING)) { 267219397Srrs if (net->cc_mod.rtcc.last_step_state == 5) 268219397Srrs net->cc_mod.rtcc.step_cnt++; 269219397Srrs else 270219397Srrs net->cc_mod.rtcc.step_cnt = 1; 271219397Srrs net->cc_mod.rtcc.last_step_state = 5; 272219397Srrs if ((net->cc_mod.rtcc.step_cnt == net->cc_mod.rtcc.steady_step) || 273219397Srrs ((net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step) && 274219397Srrs ((net->cc_mod.rtcc.step_cnt % net->cc_mod.rtcc.steady_step) == 0))) { 275219397Srrs /* Try a step down */ 276219397Srrs oth = net->cc_mod.rtcc.vol_reduce; 277219397Srrs oth <<= 16; 278219397Srrs oth |= net->cc_mod.rtcc.step_cnt; 279219397Srrs oth <<= 16; 280219397Srrs oth |= net->cc_mod.rtcc.last_step_state; 281292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttstep, 282219397Srrs vtag, 283219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 284219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 285219397Srrs oth, 286219397Srrs probepoint); 287219397Srrs if (net->cwnd > (4 * net->mtu)) { 288219397Srrs net->cwnd -= net->mtu; 289219397Srrs net->cc_mod.rtcc.vol_reduce++; 290219397Srrs } else { 291219397Srrs net->cc_mod.rtcc.step_cnt = 0; 292219397Srrs } 293219397Srrs } 294219397Srrs } 295219397Srrs return (1); 296219397Srrs } 297219397Srrs if (net->rtt < net->cc_mod.rtcc.lbw_rtt - rtt_offset) { 298219397Srrs /* 299219397Srrs * rtt decreased, there could be more room. we update both 300219397Srrs * the bw and the rtt here to lock this in as a good step 301219397Srrs * down. 302219397Srrs */ 303219397Srrs /* Probe point 6 */ 304219397Srrs probepoint |= ((6 << 16) | 0); 305292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttvar, 306219397Srrs vtag, 307219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 308219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 309219397Srrs net->flight_size, 310219397Srrs probepoint); 311219397Srrs if (net->cc_mod.rtcc.steady_step) { 312219397Srrs oth = net->cc_mod.rtcc.vol_reduce; 313219397Srrs oth <<= 16; 314219397Srrs oth |= net->cc_mod.rtcc.step_cnt; 315219397Srrs oth <<= 16; 316219397Srrs oth |= net->cc_mod.rtcc.last_step_state; 317292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttstep, 318219397Srrs vtag, 319219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 320219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 321219397Srrs oth, 322219397Srrs probepoint); 323219397Srrs if ((net->cc_mod.rtcc.last_step_state == 5) && 324219397Srrs (net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step)) { 325219397Srrs /* Step down worked */ 326219397Srrs net->cc_mod.rtcc.step_cnt = 0; 327219397Srrs return (1); 328219397Srrs } else { 329219397Srrs net->cc_mod.rtcc.last_step_state = 6; 330219397Srrs net->cc_mod.rtcc.step_cnt = 0; 331219397Srrs } 332219397Srrs } 333219397Srrs net->cc_mod.rtcc.lbw = nbw; 334219397Srrs net->cc_mod.rtcc.lbw_rtt = net->rtt; 335219397Srrs net->cc_mod.rtcc.cwnd_at_bw_set = net->cwnd; 336219397Srrs if (inst_ind == SCTP_INST_GAINING) 337219397Srrs return (1); 338219397Srrs else if (inst_ind == SCTP_INST_NEUTRAL) 339219397Srrs return (1); 340219397Srrs else 341219397Srrs return (0); 342219397Srrs } 343219397Srrs /* 344219397Srrs * Ok bw and rtt remained the same .. no update to any 345219397Srrs */ 346219397Srrs /* Probe point 7 */ 347219397Srrs probepoint |= ((7 << 16) | net->cc_mod.rtcc.ret_from_eq); 348292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttvar, 349219397Srrs vtag, 350219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 351219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 352219397Srrs net->flight_size, 353219397Srrs probepoint); 354219397Srrs if ((net->cc_mod.rtcc.steady_step) && (inst_ind != SCTP_INST_LOOSING)) { 355219397Srrs if (net->cc_mod.rtcc.last_step_state == 5) 356219397Srrs net->cc_mod.rtcc.step_cnt++; 357219397Srrs else 358219397Srrs net->cc_mod.rtcc.step_cnt = 1; 359219397Srrs net->cc_mod.rtcc.last_step_state = 5; 360219397Srrs if ((net->cc_mod.rtcc.step_cnt == net->cc_mod.rtcc.steady_step) || 361219397Srrs ((net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step) && 362219397Srrs ((net->cc_mod.rtcc.step_cnt % net->cc_mod.rtcc.steady_step) == 0))) { 363219397Srrs /* Try a step down */ 364219397Srrs if (net->cwnd > (4 * net->mtu)) { 365219397Srrs net->cwnd -= net->mtu; 366219397Srrs net->cc_mod.rtcc.vol_reduce++; 367219397Srrs return (1); 368219397Srrs } else { 369219397Srrs net->cc_mod.rtcc.step_cnt = 0; 370219397Srrs } 371219397Srrs } 372219397Srrs } 373219397Srrs if (inst_ind == SCTP_INST_GAINING) 374219397Srrs return (1); 375219397Srrs else if (inst_ind == SCTP_INST_NEUTRAL) 376219397Srrs return (1); 377219397Srrs else 378219397Srrs return ((int)net->cc_mod.rtcc.ret_from_eq); 379219397Srrs} 380219397Srrs 381219397Srrsstatic int 382219397Srrscc_bw_decrease(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw, uint64_t rtt_offset, 383219397Srrs uint64_t vtag, uint8_t inst_ind) 384219397Srrs{ 385219397Srrs uint64_t oth, probepoint; 386219397Srrs 387219397Srrs /* Bandwidth decreased. */ 388219397Srrs probepoint = (((uint64_t) net->cwnd) << 32); 389219397Srrs if (net->rtt > net->cc_mod.rtcc.lbw_rtt + rtt_offset) { 390219397Srrs /* rtt increased */ 391219397Srrs /* Did we add more */ 392219397Srrs if ((net->cwnd > net->cc_mod.rtcc.cwnd_at_bw_set) && 393219397Srrs (inst_ind != SCTP_INST_LOOSING)) { 394219397Srrs /* We caused it maybe.. back off? */ 395219397Srrs /* PROBE POINT 1 */ 396219397Srrs probepoint |= ((1 << 16) | 1); 397292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttvar, 398219397Srrs vtag, 399219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 400219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 401219397Srrs net->flight_size, 402219397Srrs probepoint); 403219397Srrs if (net->cc_mod.rtcc.ret_from_eq) { 404310218Stuexen /* Switch over to CA if we are less 405310218Stuexen * aggressive */ 406219397Srrs net->ssthresh = net->cwnd - 1; 407219397Srrs net->partial_bytes_acked = 0; 408219397Srrs } 409219397Srrs return (1); 410219397Srrs } 411219397Srrs /* Probe point 2 */ 412219397Srrs probepoint |= ((2 << 16) | 0); 413292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttvar, 414219397Srrs vtag, 415219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 416219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 417219397Srrs net->flight_size, 418219397Srrs probepoint); 419219397Srrs /* Someone else - fight for more? */ 420219397Srrs if (net->cc_mod.rtcc.steady_step) { 421219397Srrs oth = net->cc_mod.rtcc.vol_reduce; 422219397Srrs oth <<= 16; 423219397Srrs oth |= net->cc_mod.rtcc.step_cnt; 424219397Srrs oth <<= 16; 425219397Srrs oth |= net->cc_mod.rtcc.last_step_state; 426292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttstep, 427219397Srrs vtag, 428219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 429219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 430219397Srrs oth, 431219397Srrs probepoint); 432219397Srrs /* 433219397Srrs * Did we voluntarily give up some? if so take one 434219397Srrs * back please 435219397Srrs */ 436219397Srrs if ((net->cc_mod.rtcc.vol_reduce) && 437219397Srrs (inst_ind != SCTP_INST_GAINING)) { 438219397Srrs net->cwnd += net->mtu; 439279859Stuexen sctp_enforce_cwnd_limit(&stcb->asoc, net); 440219397Srrs net->cc_mod.rtcc.vol_reduce--; 441219397Srrs } 442219397Srrs net->cc_mod.rtcc.last_step_state = 2; 443219397Srrs net->cc_mod.rtcc.step_cnt = 0; 444219397Srrs } 445219397Srrs goto out_decision; 446219397Srrs } else if (net->rtt < net->cc_mod.rtcc.lbw_rtt - rtt_offset) { 447219397Srrs /* bw & rtt decreased */ 448219397Srrs /* Probe point 3 */ 449219397Srrs probepoint |= ((3 << 16) | 0); 450292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttvar, 451219397Srrs vtag, 452219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 453219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 454219397Srrs net->flight_size, 455219397Srrs probepoint); 456219397Srrs if (net->cc_mod.rtcc.steady_step) { 457219397Srrs oth = net->cc_mod.rtcc.vol_reduce; 458219397Srrs oth <<= 16; 459219397Srrs oth |= net->cc_mod.rtcc.step_cnt; 460219397Srrs oth <<= 16; 461219397Srrs oth |= net->cc_mod.rtcc.last_step_state; 462292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttstep, 463219397Srrs vtag, 464219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 465219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 466219397Srrs oth, 467219397Srrs probepoint); 468219397Srrs if ((net->cc_mod.rtcc.vol_reduce) && 469219397Srrs (inst_ind != SCTP_INST_GAINING)) { 470219397Srrs net->cwnd += net->mtu; 471279859Stuexen sctp_enforce_cwnd_limit(&stcb->asoc, net); 472219397Srrs net->cc_mod.rtcc.vol_reduce--; 473219397Srrs } 474219397Srrs net->cc_mod.rtcc.last_step_state = 3; 475219397Srrs net->cc_mod.rtcc.step_cnt = 0; 476219397Srrs } 477219397Srrs goto out_decision; 478219397Srrs } 479219397Srrs /* The bw decreased but rtt stayed the same */ 480219397Srrs /* Probe point 4 */ 481219397Srrs probepoint |= ((4 << 16) | 0); 482292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttvar, 483219397Srrs vtag, 484219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 485219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 486219397Srrs net->flight_size, 487219397Srrs probepoint); 488219397Srrs if (net->cc_mod.rtcc.steady_step) { 489219397Srrs oth = net->cc_mod.rtcc.vol_reduce; 490219397Srrs oth <<= 16; 491219397Srrs oth |= net->cc_mod.rtcc.step_cnt; 492219397Srrs oth <<= 16; 493219397Srrs oth |= net->cc_mod.rtcc.last_step_state; 494292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttstep, 495219397Srrs vtag, 496219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 497219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 498219397Srrs oth, 499219397Srrs probepoint); 500219397Srrs if ((net->cc_mod.rtcc.vol_reduce) && 501219397Srrs (inst_ind != SCTP_INST_GAINING)) { 502219397Srrs net->cwnd += net->mtu; 503279859Stuexen sctp_enforce_cwnd_limit(&stcb->asoc, net); 504219397Srrs net->cc_mod.rtcc.vol_reduce--; 505219397Srrs } 506219397Srrs net->cc_mod.rtcc.last_step_state = 4; 507219397Srrs net->cc_mod.rtcc.step_cnt = 0; 508219397Srrs } 509219397Srrsout_decision: 510219397Srrs net->cc_mod.rtcc.lbw = nbw; 511219397Srrs net->cc_mod.rtcc.lbw_rtt = net->rtt; 512219397Srrs net->cc_mod.rtcc.cwnd_at_bw_set = net->cwnd; 513219397Srrs if (inst_ind == SCTP_INST_GAINING) { 514219397Srrs return (1); 515219397Srrs } else { 516219397Srrs return (0); 517219397Srrs } 518219397Srrs} 519219397Srrs 520219397Srrsstatic int 521228653Stuexencc_bw_increase(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw, uint64_t vtag) 522219397Srrs{ 523219397Srrs uint64_t oth, probepoint; 524219397Srrs 525219397Srrs /* 526219397Srrs * BW increased, so update and return 0, since all actions in our 527219397Srrs * table say to do the normal CC update. Note that we pay no 528219397Srrs * attention to the inst_ind since our overall sum is increasing. 529219397Srrs */ 530219397Srrs /* PROBE POINT 0 */ 531219397Srrs probepoint = (((uint64_t) net->cwnd) << 32); 532292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttvar, 533219397Srrs vtag, 534219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 535219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 536219397Srrs net->flight_size, 537219397Srrs probepoint); 538219397Srrs if (net->cc_mod.rtcc.steady_step) { 539219397Srrs oth = net->cc_mod.rtcc.vol_reduce; 540219397Srrs oth <<= 16; 541219397Srrs oth |= net->cc_mod.rtcc.step_cnt; 542219397Srrs oth <<= 16; 543219397Srrs oth |= net->cc_mod.rtcc.last_step_state; 544292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttstep, 545219397Srrs vtag, 546219397Srrs ((net->cc_mod.rtcc.lbw << 32) | nbw), 547219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 548219397Srrs oth, 549219397Srrs probepoint); 550219397Srrs net->cc_mod.rtcc.last_step_state = 0; 551219397Srrs net->cc_mod.rtcc.step_cnt = 0; 552219397Srrs net->cc_mod.rtcc.vol_reduce = 0; 553219397Srrs } 554219397Srrs net->cc_mod.rtcc.lbw = nbw; 555219397Srrs net->cc_mod.rtcc.lbw_rtt = net->rtt; 556219397Srrs net->cc_mod.rtcc.cwnd_at_bw_set = net->cwnd; 557219397Srrs return (0); 558219397Srrs} 559219397Srrs 560298942Spfg/* RTCC Algorithm to limit growth of cwnd, return 561219120Srrs * true if you want to NOT allow cwnd growth 562219120Srrs */ 563219120Srrsstatic int 564219120Srrscc_bw_limit(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw) 565219120Srrs{ 566228907Stuexen uint64_t bw_offset, rtt_offset; 567228907Stuexen uint64_t probepoint, rtt, vtag; 568219397Srrs uint64_t bytes_for_this_rtt, inst_bw; 569219397Srrs uint64_t div, inst_off; 570219397Srrs int bw_shift; 571219397Srrs uint8_t inst_ind; 572219397Srrs int ret; 573219120Srrs 574219120Srrs /*- 575219120Srrs * Here we need to see if we want 576219120Srrs * to limit cwnd growth due to increase 577219120Srrs * in overall rtt but no increase in bw. 578219120Srrs * We use the following table to figure 579219120Srrs * out what we should do. When we return 580219120Srrs * 0, cc update goes on as planned. If we 581219120Srrs * return 1, then no cc update happens and cwnd 582219120Srrs * stays where it is at. 583219120Srrs * ---------------------------------- 584219120Srrs * BW | RTT | Action 585219120Srrs * ********************************* 586219120Srrs * INC | INC | return 0 587219120Srrs * ---------------------------------- 588219120Srrs * INC | SAME | return 0 589219120Srrs * ---------------------------------- 590219120Srrs * INC | DECR | return 0 591219120Srrs * ---------------------------------- 592219120Srrs * SAME | INC | return 1 593219120Srrs * ---------------------------------- 594219120Srrs * SAME | SAME | return 1 595219120Srrs * ---------------------------------- 596219120Srrs * SAME | DECR | return 0 597219120Srrs * ---------------------------------- 598219120Srrs * DECR | INC | return 0 or 1 based on if we caused. 599219120Srrs * ---------------------------------- 600219120Srrs * DECR | SAME | return 0 601219120Srrs * ---------------------------------- 602219120Srrs * DECR | DECR | return 0 603219120Srrs * ---------------------------------- 604219120Srrs * 605219120Srrs * We are a bit fuzz on what an increase or 606219120Srrs * decrease is. For BW it is the same if 607219120Srrs * it did not change within 1/64th. For 608219120Srrs * RTT it stayed the same if it did not 609219120Srrs * change within 1/32nd 610219120Srrs */ 611219397Srrs bw_shift = SCTP_BASE_SYSCTL(sctp_rttvar_bw); 612219120Srrs rtt = stcb->asoc.my_vtag; 613219120Srrs vtag = (rtt << 32) | (((uint32_t) (stcb->sctp_ep->sctp_lport)) << 16) | (stcb->rport); 614219120Srrs probepoint = (((uint64_t) net->cwnd) << 32); 615219120Srrs rtt = net->rtt; 616219397Srrs if (net->cc_mod.rtcc.rtt_set_this_sack) { 617219397Srrs net->cc_mod.rtcc.rtt_set_this_sack = 0; 618219397Srrs bytes_for_this_rtt = net->cc_mod.rtcc.bw_bytes - net->cc_mod.rtcc.bw_bytes_at_last_rttc; 619219397Srrs net->cc_mod.rtcc.bw_bytes_at_last_rttc = net->cc_mod.rtcc.bw_bytes; 620219397Srrs if (net->rtt) { 621219397Srrs div = net->rtt / 1000; 622219397Srrs if (div) { 623219397Srrs inst_bw = bytes_for_this_rtt / div; 624219397Srrs inst_off = inst_bw >> bw_shift; 625219397Srrs if (inst_bw > nbw) 626219397Srrs inst_ind = SCTP_INST_GAINING; 627219397Srrs else if ((inst_bw + inst_off) < nbw) 628219397Srrs inst_ind = SCTP_INST_LOOSING; 629219397Srrs else 630219397Srrs inst_ind = SCTP_INST_NEUTRAL; 631219397Srrs probepoint |= ((0xb << 16) | inst_ind); 632219397Srrs } else { 633228907Stuexen inst_ind = net->cc_mod.rtcc.last_inst_ind; 634219397Srrs inst_bw = bytes_for_this_rtt / (uint64_t) (net->rtt); 635219397Srrs /* Can't determine do not change */ 636219397Srrs probepoint |= ((0xc << 16) | inst_ind); 637219397Srrs } 638219397Srrs } else { 639228907Stuexen inst_ind = net->cc_mod.rtcc.last_inst_ind; 640219397Srrs inst_bw = bytes_for_this_rtt; 641219397Srrs /* Can't determine do not change */ 642219397Srrs probepoint |= ((0xd << 16) | inst_ind); 643219397Srrs } 644292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttvar, 645219120Srrs vtag, 646219397Srrs ((nbw << 32) | inst_bw), 647219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | rtt), 648219397Srrs net->flight_size, 649219120Srrs probepoint); 650219397Srrs } else { 651219397Srrs /* No rtt measurement, use last one */ 652219397Srrs inst_ind = net->cc_mod.rtcc.last_inst_ind; 653219120Srrs } 654219397Srrs bw_offset = net->cc_mod.rtcc.lbw >> bw_shift; 655219397Srrs if (nbw > net->cc_mod.rtcc.lbw + bw_offset) { 656228653Stuexen ret = cc_bw_increase(stcb, net, nbw, vtag); 657219397Srrs goto out; 658219397Srrs } 659219120Srrs rtt_offset = net->cc_mod.rtcc.lbw_rtt >> SCTP_BASE_SYSCTL(sctp_rttvar_rtt); 660219120Srrs if (nbw < net->cc_mod.rtcc.lbw - bw_offset) { 661219397Srrs ret = cc_bw_decrease(stcb, net, nbw, rtt_offset, vtag, inst_ind); 662219397Srrs goto out; 663219120Srrs } 664219120Srrs /* 665219120Srrs * If we reach here then we are in a situation where the bw stayed 666219120Srrs * the same. 667219120Srrs */ 668219397Srrs ret = cc_bw_same(stcb, net, nbw, rtt_offset, vtag, inst_ind); 669219397Srrsout: 670219397Srrs net->cc_mod.rtcc.last_inst_ind = inst_ind; 671219397Srrs return (ret); 672219120Srrs} 673219120Srrs 674217611Stuexenstatic void 675219120Srrssctp_cwnd_update_after_sack_common(struct sctp_tcb *stcb, 676171440Srrs struct sctp_association *asoc, 677228653Stuexen int accum_moved, int reneged_all SCTP_UNUSED, int will_exit, int use_rtcc) 678171440Srrs{ 679171440Srrs struct sctp_nets *net; 680215817Srrs int old_cwnd; 681217469Stuexen uint32_t t_ssthresh, t_cwnd, incr; 682221460Stuexen uint64_t t_ucwnd_sbw; 683221460Stuexen uint64_t t_path_mptcp; 684221460Stuexen uint64_t mptcp_like_alpha; 685221460Stuexen uint32_t srtt; 686221460Stuexen uint64_t max_path; 687171440Srrs 688217469Stuexen /* MT FIXME: Don't compute this over and over again */ 689217469Stuexen t_ssthresh = 0; 690217469Stuexen t_cwnd = 0; 691221460Stuexen t_ucwnd_sbw = 0; 692221460Stuexen t_path_mptcp = 0; 693221460Stuexen mptcp_like_alpha = 1; 694221460Stuexen if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) || 695221460Stuexen (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2) || 696221460Stuexen (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_MPTCP)) { 697221460Stuexen max_path = 0; 698217469Stuexen TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 699217469Stuexen t_ssthresh += net->ssthresh; 700217469Stuexen t_cwnd += net->cwnd; 701221460Stuexen /* lastsa>>3; we don't need to devide ... */ 702221460Stuexen srtt = net->lastsa; 703221460Stuexen if (srtt > 0) { 704221460Stuexen uint64_t tmp; 705221460Stuexen 706221460Stuexen t_ucwnd_sbw += (uint64_t) net->cwnd / (uint64_t) srtt; 707221460Stuexen t_path_mptcp += (((uint64_t) net->cwnd) << SHIFT_MPTCP_MULTI_Z) / 708221460Stuexen (((uint64_t) net->mtu) * (uint64_t) srtt); 709221460Stuexen tmp = (((uint64_t) net->cwnd) << SHIFT_MPTCP_MULTI_N) / 710221460Stuexen ((uint64_t) net->mtu * (uint64_t) (srtt * srtt)); 711221460Stuexen if (tmp > max_path) { 712221460Stuexen max_path = tmp; 713221460Stuexen } 714221460Stuexen } 715217469Stuexen } 716221460Stuexen if (t_path_mptcp > 0) { 717221460Stuexen mptcp_like_alpha = max_path / (t_path_mptcp * t_path_mptcp); 718221460Stuexen } else { 719221460Stuexen mptcp_like_alpha = 1; 720221460Stuexen } 721217469Stuexen } 722228907Stuexen if (t_ssthresh == 0) { 723228907Stuexen t_ssthresh = 1; 724228907Stuexen } 725228907Stuexen if (t_ucwnd_sbw == 0) { 726228907Stuexen t_ucwnd_sbw = 1; 727228907Stuexen } 728171440Srrs /******************************/ 729171440Srrs /* update cwnd and Early FR */ 730171440Srrs /******************************/ 731171440Srrs TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 732171440Srrs 733171440Srrs#ifdef JANA_CMT_FAST_RECOVERY 734171440Srrs /* 735171440Srrs * CMT fast recovery code. Need to debug. 736171440Srrs */ 737171440Srrs if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) { 738217469Stuexen if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) || 739217469Stuexen SCTP_TSN_GE(net->pseudo_cumack, net->fast_recovery_tsn)) { 740171440Srrs net->will_exit_fast_recovery = 1; 741171440Srrs } 742171440Srrs } 743171440Srrs#endif 744171440Srrs /* if nothing was acked on this destination skip it */ 745171440Srrs if (net->net_ack == 0) { 746179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 747171440Srrs sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK); 748171440Srrs } 749171440Srrs continue; 750171440Srrs } 751171440Srrs#ifdef JANA_CMT_FAST_RECOVERY 752171440Srrs /* 753171440Srrs * CMT fast recovery code 754171440Srrs */ 755171440Srrs /* 756216669Stuexen * if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery 757216669Stuexen * && net->will_exit_fast_recovery == 0) { @@@ Do something 758216669Stuexen * } else if (sctp_cmt_on_off == 0 && 759171440Srrs * asoc->fast_retran_loss_recovery && will_exit == 0) { 760171440Srrs */ 761171440Srrs#endif 762171440Srrs 763211944Stuexen if (asoc->fast_retran_loss_recovery && 764211944Stuexen (will_exit == 0) && 765211944Stuexen (asoc->sctp_cmt_on_off == 0)) { 766171440Srrs /* 767171440Srrs * If we are in loss recovery we skip any cwnd 768171440Srrs * update 769171440Srrs */ 770224641Stuexen return; 771171440Srrs } 772171440Srrs /* 773219120Srrs * Did any measurements go on for this network? 774219120Srrs */ 775219120Srrs if (use_rtcc && (net->cc_mod.rtcc.tls_needs_set > 0)) { 776219120Srrs uint64_t nbw; 777219120Srrs 778219120Srrs /* 779219120Srrs * At this point our bw_bytes has been updated by 780219120Srrs * incoming sack information. 781310218Stuexen * 782219120Srrs * But our bw may not yet be set. 783310218Stuexen * 784219120Srrs */ 785219120Srrs if ((net->cc_mod.rtcc.new_tot_time / 1000) > 0) { 786219120Srrs nbw = net->cc_mod.rtcc.bw_bytes / (net->cc_mod.rtcc.new_tot_time / 1000); 787219120Srrs } else { 788219120Srrs nbw = net->cc_mod.rtcc.bw_bytes; 789219120Srrs } 790219120Srrs if (net->cc_mod.rtcc.lbw) { 791219120Srrs if (cc_bw_limit(stcb, net, nbw)) { 792219120Srrs /* Hold here, no update */ 793224641Stuexen continue; 794219120Srrs } 795219120Srrs } else { 796219120Srrs uint64_t vtag, probepoint; 797219120Srrs 798219120Srrs probepoint = (((uint64_t) net->cwnd) << 32); 799219120Srrs probepoint |= ((0xa << 16) | 0); 800219120Srrs vtag = (net->rtt << 32) | 801219120Srrs (((uint32_t) (stcb->sctp_ep->sctp_lport)) << 16) | 802219120Srrs (stcb->rport); 803219120Srrs 804292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttvar, 805219120Srrs vtag, 806219120Srrs nbw, 807219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 808219397Srrs net->flight_size, 809219120Srrs probepoint); 810219120Srrs net->cc_mod.rtcc.lbw = nbw; 811219120Srrs net->cc_mod.rtcc.lbw_rtt = net->rtt; 812219397Srrs if (net->cc_mod.rtcc.rtt_set_this_sack) { 813219397Srrs net->cc_mod.rtcc.rtt_set_this_sack = 0; 814219397Srrs net->cc_mod.rtcc.bw_bytes_at_last_rttc = net->cc_mod.rtcc.bw_bytes; 815219397Srrs } 816219120Srrs } 817219120Srrs } 818219120Srrs /* 819171440Srrs * CMT: CUC algorithm. Update cwnd if pseudo-cumack has 820171440Srrs * moved. 821171440Srrs */ 822211944Stuexen if (accum_moved || 823216669Stuexen ((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) { 824171440Srrs /* If the cumulative ack moved we can proceed */ 825171440Srrs if (net->cwnd <= net->ssthresh) { 826171440Srrs /* We are in slow start */ 827179157Srrs if (net->flight_size + net->net_ack >= net->cwnd) { 828221460Stuexen uint32_t limit; 829221460Stuexen 830217469Stuexen old_cwnd = net->cwnd; 831221460Stuexen switch (asoc->sctp_cmt_on_off) { 832221460Stuexen case SCTP_CMT_RPV1: 833217469Stuexen limit = (uint32_t) (((uint64_t) net->mtu * 834217469Stuexen (uint64_t) SCTP_BASE_SYSCTL(sctp_L2_abc_variable) * 835217469Stuexen (uint64_t) net->ssthresh) / 836217469Stuexen (uint64_t) t_ssthresh); 837217469Stuexen incr = (uint32_t) (((uint64_t) net->net_ack * 838217469Stuexen (uint64_t) net->ssthresh) / 839217469Stuexen (uint64_t) t_ssthresh); 840217469Stuexen if (incr > limit) { 841217469Stuexen incr = limit; 842171440Srrs } 843217469Stuexen if (incr == 0) { 844217469Stuexen incr = 1; 845217469Stuexen } 846221460Stuexen break; 847221460Stuexen case SCTP_CMT_RPV2: 848310218Stuexen /* lastsa>>3; we don't need 849310218Stuexen * to divide ... */ 850221460Stuexen srtt = net->lastsa; 851221460Stuexen if (srtt == 0) { 852221460Stuexen srtt = 1; 853221460Stuexen } 854221460Stuexen limit = (uint32_t) (((uint64_t) net->mtu * 855221460Stuexen (uint64_t) SCTP_BASE_SYSCTL(sctp_L2_abc_variable) * 856221460Stuexen (uint64_t) net->cwnd) / 857221460Stuexen ((uint64_t) srtt * t_ucwnd_sbw)); 858221460Stuexen /* INCREASE FACTOR */ 859221460Stuexen incr = (uint32_t) (((uint64_t) net->net_ack * 860221460Stuexen (uint64_t) net->cwnd) / 861221460Stuexen ((uint64_t) srtt * t_ucwnd_sbw)); 862221460Stuexen /* INCREASE FACTOR */ 863221460Stuexen if (incr > limit) { 864221460Stuexen incr = limit; 865221460Stuexen } 866221460Stuexen if (incr == 0) { 867221460Stuexen incr = 1; 868221460Stuexen } 869221460Stuexen break; 870221460Stuexen case SCTP_CMT_MPTCP: 871221460Stuexen limit = (uint32_t) (((uint64_t) net->mtu * 872221460Stuexen mptcp_like_alpha * 873221460Stuexen (uint64_t) SCTP_BASE_SYSCTL(sctp_L2_abc_variable)) >> 874221460Stuexen SHIFT_MPTCP_MULTI); 875221460Stuexen incr = (uint32_t) (((uint64_t) net->net_ack * 876221460Stuexen mptcp_like_alpha) >> 877221460Stuexen SHIFT_MPTCP_MULTI); 878221460Stuexen if (incr > limit) { 879221460Stuexen incr = limit; 880221460Stuexen } 881221460Stuexen if (incr > net->net_ack) { 882221460Stuexen incr = net->net_ack; 883221460Stuexen } 884221460Stuexen if (incr > net->mtu) { 885221460Stuexen incr = net->mtu; 886221460Stuexen } 887221460Stuexen break; 888221460Stuexen default: 889217469Stuexen incr = net->net_ack; 890217469Stuexen if (incr > net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable)) { 891217469Stuexen incr = net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable); 892171440Srrs } 893221460Stuexen break; 894171440Srrs } 895217469Stuexen net->cwnd += incr; 896279859Stuexen sctp_enforce_cwnd_limit(asoc, net); 897217469Stuexen if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 898217469Stuexen sctp_log_cwnd(stcb, net, incr, 899217469Stuexen SCTP_CWND_LOG_FROM_SS); 900217469Stuexen } 901292384Smarkj SDT_PROBE5(sctp, cwnd, net, ack, 902217469Stuexen stcb->asoc.my_vtag, 903217469Stuexen ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 904217469Stuexen net, 905217469Stuexen old_cwnd, net->cwnd); 906171440Srrs } else { 907179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 908171440Srrs sctp_log_cwnd(stcb, net, net->net_ack, 909171440Srrs SCTP_CWND_LOG_NOADV_SS); 910171440Srrs } 911171440Srrs } 912171440Srrs } else { 913171440Srrs /* We are in congestion avoidance */ 914179141Srrs /* 915179141Srrs * Add to pba 916179141Srrs */ 917179157Srrs net->partial_bytes_acked += net->net_ack; 918171440Srrs 919179141Srrs if ((net->flight_size + net->net_ack >= net->cwnd) && 920179141Srrs (net->partial_bytes_acked >= net->cwnd)) { 921179141Srrs net->partial_bytes_acked -= net->cwnd; 922215817Srrs old_cwnd = net->cwnd; 923221460Stuexen switch (asoc->sctp_cmt_on_off) { 924221460Stuexen case SCTP_CMT_RPV1: 925217469Stuexen incr = (uint32_t) (((uint64_t) net->mtu * 926217469Stuexen (uint64_t) net->ssthresh) / 927217469Stuexen (uint64_t) t_ssthresh); 928217469Stuexen if (incr == 0) { 929217469Stuexen incr = 1; 930217469Stuexen } 931221460Stuexen break; 932221460Stuexen case SCTP_CMT_RPV2: 933310218Stuexen /* lastsa>>3; we don't need 934310218Stuexen * to divide ... */ 935221460Stuexen srtt = net->lastsa; 936221460Stuexen if (srtt == 0) { 937221460Stuexen srtt = 1; 938221460Stuexen } 939221460Stuexen incr = (uint32_t) ((uint64_t) net->mtu * 940221460Stuexen (uint64_t) net->cwnd / 941221460Stuexen ((uint64_t) srtt * 942221460Stuexen t_ucwnd_sbw)); 943221460Stuexen /* INCREASE FACTOR */ 944221460Stuexen if (incr == 0) { 945221460Stuexen incr = 1; 946221460Stuexen } 947221460Stuexen break; 948221460Stuexen case SCTP_CMT_MPTCP: 949221460Stuexen incr = (uint32_t) ((mptcp_like_alpha * 950221460Stuexen (uint64_t) net->cwnd) >> 951221460Stuexen SHIFT_MPTCP_MULTI); 952221460Stuexen if (incr > net->mtu) { 953221460Stuexen incr = net->mtu; 954221460Stuexen } 955221460Stuexen break; 956221460Stuexen default: 957217469Stuexen incr = net->mtu; 958221460Stuexen break; 959217469Stuexen } 960217469Stuexen net->cwnd += incr; 961279859Stuexen sctp_enforce_cwnd_limit(asoc, net); 962292384Smarkj SDT_PROBE5(sctp, cwnd, net, ack, 963215817Srrs stcb->asoc.my_vtag, 964215817Srrs ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 965215817Srrs net, 966215817Srrs old_cwnd, net->cwnd); 967179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 968179141Srrs sctp_log_cwnd(stcb, net, net->mtu, 969179141Srrs SCTP_CWND_LOG_FROM_CA); 970171440Srrs } 971171440Srrs } else { 972179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 973171440Srrs sctp_log_cwnd(stcb, net, net->net_ack, 974171440Srrs SCTP_CWND_LOG_NOADV_CA); 975171440Srrs } 976171440Srrs } 977171440Srrs } 978171440Srrs } else { 979179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 980171440Srrs sctp_log_cwnd(stcb, net, net->mtu, 981171440Srrs SCTP_CWND_LOG_NO_CUMACK); 982171440Srrs } 983171440Srrs } 984171440Srrs } 985171440Srrs} 986171440Srrs 987217611Stuexenstatic void 988224641Stuexensctp_cwnd_update_exit_pf_common(struct sctp_tcb *stcb, struct sctp_nets *net) 989224641Stuexen{ 990224641Stuexen int old_cwnd; 991224641Stuexen 992224641Stuexen old_cwnd = net->cwnd; 993224641Stuexen net->cwnd = net->mtu; 994292384Smarkj SDT_PROBE5(sctp, cwnd, net, ack, 995224641Stuexen stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net, 996224641Stuexen old_cwnd, net->cwnd); 997224641Stuexen SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n", 998240148Stuexen (void *)net, net->cwnd); 999224641Stuexen} 1000224641Stuexen 1001224641Stuexen 1002224641Stuexenstatic void 1003179157Srrssctp_cwnd_update_after_timeout(struct sctp_tcb *stcb, struct sctp_nets *net) 1004171440Srrs{ 1005171440Srrs int old_cwnd = net->cwnd; 1006217469Stuexen uint32_t t_ssthresh, t_cwnd; 1007221460Stuexen uint64_t t_ucwnd_sbw; 1008171440Srrs 1009217469Stuexen /* MT FIXME: Don't compute this over and over again */ 1010217469Stuexen t_ssthresh = 0; 1011217469Stuexen t_cwnd = 0; 1012221460Stuexen if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) || 1013221460Stuexen (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2)) { 1014217469Stuexen struct sctp_nets *lnet; 1015221460Stuexen uint32_t srtt; 1016217469Stuexen 1017221460Stuexen t_ucwnd_sbw = 0; 1018217469Stuexen TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) { 1019217469Stuexen t_ssthresh += lnet->ssthresh; 1020217469Stuexen t_cwnd += lnet->cwnd; 1021221460Stuexen srtt = lnet->lastsa; 1022221460Stuexen /* lastsa>>3; we don't need to divide ... */ 1023221460Stuexen if (srtt > 0) { 1024221460Stuexen t_ucwnd_sbw += (uint64_t) lnet->cwnd / (uint64_t) srtt; 1025221460Stuexen } 1026217469Stuexen } 1027228907Stuexen if (t_ssthresh < 1) { 1028228907Stuexen t_ssthresh = 1; 1029228907Stuexen } 1030221460Stuexen if (t_ucwnd_sbw < 1) { 1031221460Stuexen t_ucwnd_sbw = 1; 1032221460Stuexen } 1033221460Stuexen if (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) { 1034221460Stuexen net->ssthresh = (uint32_t) (((uint64_t) 4 * 1035221460Stuexen (uint64_t) net->mtu * 1036221460Stuexen (uint64_t) net->ssthresh) / 1037221460Stuexen (uint64_t) t_ssthresh); 1038221460Stuexen } else { 1039221460Stuexen uint64_t cc_delta; 1040221460Stuexen 1041221460Stuexen srtt = net->lastsa; 1042221460Stuexen /* lastsa>>3; we don't need to divide ... */ 1043221460Stuexen if (srtt == 0) { 1044221460Stuexen srtt = 1; 1045221460Stuexen } 1046221460Stuexen cc_delta = t_ucwnd_sbw * (uint64_t) srtt / 2; 1047221460Stuexen if (cc_delta < t_cwnd) { 1048221460Stuexen net->ssthresh = (uint32_t) ((uint64_t) t_cwnd - cc_delta); 1049221460Stuexen } else { 1050221460Stuexen net->ssthresh = net->mtu; 1051221460Stuexen } 1052221460Stuexen } 1053217469Stuexen if ((net->cwnd > t_cwnd / 2) && 1054217469Stuexen (net->ssthresh < net->cwnd - t_cwnd / 2)) { 1055217469Stuexen net->ssthresh = net->cwnd - t_cwnd / 2; 1056217469Stuexen } 1057217469Stuexen if (net->ssthresh < net->mtu) { 1058217469Stuexen net->ssthresh = net->mtu; 1059217469Stuexen } 1060217469Stuexen } else { 1061217469Stuexen net->ssthresh = max(net->cwnd / 2, 4 * net->mtu); 1062217469Stuexen } 1063171440Srrs net->cwnd = net->mtu; 1064179157Srrs net->partial_bytes_acked = 0; 1065292384Smarkj SDT_PROBE5(sctp, cwnd, net, to, 1066215817Srrs stcb->asoc.my_vtag, 1067215817Srrs ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 1068215817Srrs net, 1069215817Srrs old_cwnd, net->cwnd); 1070179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1071171440Srrs sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX); 1072171440Srrs } 1073171440Srrs} 1074171440Srrs 1075217611Stuexenstatic void 1076219120Srrssctp_cwnd_update_after_ecn_echo_common(struct sctp_tcb *stcb, struct sctp_nets *net, 1077219120Srrs int in_window, int num_pkt_lost, int use_rtcc) 1078179157Srrs{ 1079179157Srrs int old_cwnd = net->cwnd; 1080179157Srrs 1081219120Srrs if ((use_rtcc) && (net->lan_type == SCTP_LAN_LOCAL) && (net->cc_mod.rtcc.use_dccc_ecn)) { 1082219120Srrs /* Data center Congestion Control */ 1083219120Srrs if (in_window == 0) { 1084219120Srrs /* 1085219120Srrs * Go to CA with the cwnd at the point we sent the 1086219120Srrs * TSN that was marked with a CE. 1087219120Srrs */ 1088219120Srrs if (net->ecn_prev_cwnd < net->cwnd) { 1089219120Srrs /* Restore to prev cwnd */ 1090219120Srrs net->cwnd = net->ecn_prev_cwnd - (net->mtu * num_pkt_lost); 1091219120Srrs } else { 1092219120Srrs /* Just cut in 1/2 */ 1093219120Srrs net->cwnd /= 2; 1094219120Srrs } 1095219120Srrs /* Drop to CA */ 1096219120Srrs net->ssthresh = net->cwnd - (num_pkt_lost * net->mtu); 1097219120Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1098219120Srrs sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); 1099219120Srrs } 1100219120Srrs } else { 1101310218Stuexen /* Further tuning down required over the drastic 1102310218Stuexen * original cut */ 1103219120Srrs net->ssthresh -= (net->mtu * num_pkt_lost); 1104219120Srrs net->cwnd -= (net->mtu * num_pkt_lost); 1105219120Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1106219120Srrs sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); 1107219120Srrs } 1108219120Srrs } 1109218129Srrs SCTP_STAT_INCR(sctps_ecnereducedcwnd); 1110219120Srrs } else { 1111219120Srrs if (in_window == 0) { 1112219120Srrs SCTP_STAT_INCR(sctps_ecnereducedcwnd); 1113219120Srrs net->ssthresh = net->cwnd / 2; 1114219120Srrs if (net->ssthresh < net->mtu) { 1115219120Srrs net->ssthresh = net->mtu; 1116310218Stuexen /* here back off the timer as well, to slow 1117310218Stuexen * us down */ 1118219120Srrs net->RTO <<= 1; 1119219120Srrs } 1120219120Srrs net->cwnd = net->ssthresh; 1121292384Smarkj SDT_PROBE5(sctp, cwnd, net, ecn, 1122219120Srrs stcb->asoc.my_vtag, 1123219120Srrs ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 1124219120Srrs net, 1125219120Srrs old_cwnd, net->cwnd); 1126219120Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1127219120Srrs sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); 1128219120Srrs } 1129218129Srrs } 1130179157Srrs } 1131219120Srrs 1132179157Srrs} 1133179157Srrs 1134217611Stuexenstatic void 1135179157Srrssctp_cwnd_update_after_packet_dropped(struct sctp_tcb *stcb, 1136179157Srrs struct sctp_nets *net, struct sctp_pktdrop_chunk *cp, 1137179157Srrs uint32_t * bottle_bw, uint32_t * on_queue) 1138179157Srrs{ 1139179157Srrs uint32_t bw_avail; 1140218232Srrs unsigned int incr; 1141179157Srrs int old_cwnd = net->cwnd; 1142179157Srrs 1143179157Srrs /* get bottle neck bw */ 1144179157Srrs *bottle_bw = ntohl(cp->bottle_bw); 1145179157Srrs /* and whats on queue */ 1146179157Srrs *on_queue = ntohl(cp->current_onq); 1147179157Srrs /* 1148179157Srrs * adjust the on-queue if our flight is more it could be that the 1149179157Srrs * router has not yet gotten data "in-flight" to it 1150179157Srrs */ 1151271672Stuexen if (*on_queue < net->flight_size) { 1152179157Srrs *on_queue = net->flight_size; 1153271672Stuexen } 1154271672Stuexen /* rtt is measured in micro seconds, bottle_bw in bytes per second */ 1155271672Stuexen bw_avail = (uint32_t) (((uint64_t) (*bottle_bw) * net->rtt) / (uint64_t) 1000000); 1156179157Srrs if (bw_avail > *bottle_bw) { 1157179157Srrs /* 1158179157Srrs * Cap the growth to no more than the bottle neck. This can 1159179157Srrs * happen as RTT slides up due to queues. It also means if 1160179157Srrs * you have more than a 1 second RTT with a empty queue you 1161179157Srrs * will be limited to the bottle_bw per second no matter if 1162179157Srrs * other points have 1/2 the RTT and you could get more 1163179157Srrs * out... 1164179157Srrs */ 1165179157Srrs bw_avail = *bottle_bw; 1166179157Srrs } 1167179157Srrs if (*on_queue > bw_avail) { 1168179157Srrs /* 1169179157Srrs * No room for anything else don't allow anything else to be 1170179157Srrs * "added to the fire". 1171179157Srrs */ 1172179157Srrs int seg_inflight, seg_onqueue, my_portion; 1173179157Srrs 1174179157Srrs net->partial_bytes_acked = 0; 1175179157Srrs /* how much are we over queue size? */ 1176179157Srrs incr = *on_queue - bw_avail; 1177179157Srrs if (stcb->asoc.seen_a_sack_this_pkt) { 1178179157Srrs /* 1179179157Srrs * undo any cwnd adjustment that the sack might have 1180179157Srrs * made 1181179157Srrs */ 1182179157Srrs net->cwnd = net->prev_cwnd; 1183179157Srrs } 1184179157Srrs /* Now how much of that is mine? */ 1185179157Srrs seg_inflight = net->flight_size / net->mtu; 1186179157Srrs seg_onqueue = *on_queue / net->mtu; 1187179157Srrs my_portion = (incr * seg_inflight) / seg_onqueue; 1188179157Srrs 1189179157Srrs /* Have I made an adjustment already */ 1190179157Srrs if (net->cwnd > net->flight_size) { 1191179157Srrs /* 1192179157Srrs * for this flight I made an adjustment we need to 1193179157Srrs * decrease the portion by a share our previous 1194179157Srrs * adjustment. 1195179157Srrs */ 1196179157Srrs int diff_adj; 1197179157Srrs 1198179157Srrs diff_adj = net->cwnd - net->flight_size; 1199179157Srrs if (diff_adj > my_portion) 1200179157Srrs my_portion = 0; 1201179157Srrs else 1202179157Srrs my_portion -= diff_adj; 1203179157Srrs } 1204179157Srrs /* 1205179157Srrs * back down to the previous cwnd (assume we have had a sack 1206179157Srrs * before this packet). minus what ever portion of the 1207179157Srrs * overage is my fault. 1208179157Srrs */ 1209179157Srrs net->cwnd -= my_portion; 1210179157Srrs 1211179157Srrs /* we will NOT back down more than 1 MTU */ 1212179157Srrs if (net->cwnd <= net->mtu) { 1213179157Srrs net->cwnd = net->mtu; 1214179157Srrs } 1215179157Srrs /* force into CA */ 1216179157Srrs net->ssthresh = net->cwnd - 1; 1217179157Srrs } else { 1218179157Srrs /* 1219179157Srrs * Take 1/4 of the space left or max burst up .. whichever 1220179157Srrs * is less. 1221179157Srrs */ 1222217894Stuexen incr = (bw_avail - *on_queue) >> 2; 1223217894Stuexen if ((stcb->asoc.max_burst > 0) && 1224217894Stuexen (stcb->asoc.max_burst * net->mtu < incr)) { 1225217894Stuexen incr = stcb->asoc.max_burst * net->mtu; 1226217894Stuexen } 1227179157Srrs net->cwnd += incr; 1228179157Srrs } 1229179157Srrs if (net->cwnd > bw_avail) { 1230179157Srrs /* We can't exceed the pipe size */ 1231179157Srrs net->cwnd = bw_avail; 1232179157Srrs } 1233179157Srrs if (net->cwnd < net->mtu) { 1234179157Srrs /* We always have 1 MTU */ 1235179157Srrs net->cwnd = net->mtu; 1236179157Srrs } 1237279859Stuexen sctp_enforce_cwnd_limit(&stcb->asoc, net); 1238179157Srrs if (net->cwnd - old_cwnd != 0) { 1239179157Srrs /* log only changes */ 1240292384Smarkj SDT_PROBE5(sctp, cwnd, net, pd, 1241215817Srrs stcb->asoc.my_vtag, 1242215817Srrs ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 1243215817Srrs net, 1244215817Srrs old_cwnd, net->cwnd); 1245179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1246179157Srrs sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), 1247179157Srrs SCTP_CWND_LOG_FROM_SAT); 1248179157Srrs } 1249179157Srrs } 1250179157Srrs} 1251179157Srrs 1252217611Stuexenstatic void 1253179157Srrssctp_cwnd_update_after_output(struct sctp_tcb *stcb, 1254179157Srrs struct sctp_nets *net, int burst_limit) 1255179157Srrs{ 1256179157Srrs int old_cwnd = net->cwnd; 1257179157Srrs 1258179157Srrs if (net->ssthresh < net->cwnd) 1259179157Srrs net->ssthresh = net->cwnd; 1260219120Srrs if (burst_limit) { 1261219120Srrs net->cwnd = (net->flight_size + (burst_limit * net->mtu)); 1262279859Stuexen sctp_enforce_cwnd_limit(&stcb->asoc, net); 1263292384Smarkj SDT_PROBE5(sctp, cwnd, net, bl, 1264219120Srrs stcb->asoc.my_vtag, 1265219120Srrs ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 1266219120Srrs net, 1267219120Srrs old_cwnd, net->cwnd); 1268219120Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1269219120Srrs sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_BRST); 1270219120Srrs } 1271179157Srrs } 1272179157Srrs} 1273179157Srrs 1274217611Stuexenstatic void 1275219120Srrssctp_cwnd_update_after_sack(struct sctp_tcb *stcb, 1276219120Srrs struct sctp_association *asoc, 1277219120Srrs int accum_moved, int reneged_all, int will_exit) 1278219120Srrs{ 1279298942Spfg /* Passing a zero argument in last disables the rtcc algorithm */ 1280219120Srrs sctp_cwnd_update_after_sack_common(stcb, asoc, accum_moved, reneged_all, will_exit, 0); 1281219120Srrs} 1282219120Srrs 1283219120Srrsstatic void 1284219120Srrssctp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net, 1285219120Srrs int in_window, int num_pkt_lost) 1286219120Srrs{ 1287298942Spfg /* Passing a zero argument in last disables the rtcc algorithm */ 1288219120Srrs sctp_cwnd_update_after_ecn_echo_common(stcb, net, in_window, num_pkt_lost, 0); 1289219120Srrs} 1290219120Srrs 1291219120Srrs/* Here starts the RTCCVAR type CC invented by RRS which 1292219120Srrs * is a slight mod to RFC2581. We reuse a common routine or 1293298942Spfg * two since these algorithms are so close and need to 1294219120Srrs * remain the same. 1295219120Srrs */ 1296219120Srrsstatic void 1297219120Srrssctp_cwnd_update_rtcc_after_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net, 1298219120Srrs int in_window, int num_pkt_lost) 1299219120Srrs{ 1300219120Srrs sctp_cwnd_update_after_ecn_echo_common(stcb, net, in_window, num_pkt_lost, 1); 1301219120Srrs} 1302219120Srrs 1303219120Srrs 1304219120Srrsstatic 1305219120Srrsvoid 1306219120Srrssctp_cwnd_update_rtcc_tsn_acknowledged(struct sctp_nets *net, 1307219120Srrs struct sctp_tmit_chunk *tp1) 1308219120Srrs{ 1309219120Srrs net->cc_mod.rtcc.bw_bytes += tp1->send_size; 1310219120Srrs} 1311219120Srrs 1312219120Srrsstatic void 1313228653Stuexensctp_cwnd_prepare_rtcc_net_for_sack(struct sctp_tcb *stcb SCTP_UNUSED, 1314219120Srrs struct sctp_nets *net) 1315219120Srrs{ 1316219120Srrs if (net->cc_mod.rtcc.tls_needs_set > 0) { 1317219120Srrs /* We had a bw measurment going on */ 1318219120Srrs struct timeval ltls; 1319219120Srrs 1320219120Srrs SCTP_GETPTIME_TIMEVAL(<ls); 1321219120Srrs timevalsub(<ls, &net->cc_mod.rtcc.tls); 1322219120Srrs net->cc_mod.rtcc.new_tot_time = (ltls.tv_sec * 1000000) + ltls.tv_usec; 1323219120Srrs } 1324219120Srrs} 1325219120Srrs 1326219120Srrsstatic void 1327219120Srrssctp_cwnd_new_rtcc_transmission_begins(struct sctp_tcb *stcb, 1328219120Srrs struct sctp_nets *net) 1329219120Srrs{ 1330219120Srrs uint64_t vtag, probepoint; 1331219120Srrs 1332219120Srrs if (net->cc_mod.rtcc.lbw) { 1333219120Srrs /* Clear the old bw.. we went to 0 in-flight */ 1334219120Srrs vtag = (net->rtt << 32) | (((uint32_t) (stcb->sctp_ep->sctp_lport)) << 16) | 1335219120Srrs (stcb->rport); 1336219120Srrs probepoint = (((uint64_t) net->cwnd) << 32); 1337219120Srrs /* Probe point 8 */ 1338219120Srrs probepoint |= ((8 << 16) | 0); 1339292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttvar, 1340219120Srrs vtag, 1341219120Srrs ((net->cc_mod.rtcc.lbw << 32) | 0), 1342219397Srrs ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), 1343219397Srrs net->flight_size, 1344219120Srrs probepoint); 1345219120Srrs net->cc_mod.rtcc.lbw_rtt = 0; 1346219120Srrs net->cc_mod.rtcc.cwnd_at_bw_set = 0; 1347219120Srrs net->cc_mod.rtcc.lbw = 0; 1348219397Srrs net->cc_mod.rtcc.bw_bytes_at_last_rttc = 0; 1349219397Srrs net->cc_mod.rtcc.vol_reduce = 0; 1350219120Srrs net->cc_mod.rtcc.bw_tot_time = 0; 1351219120Srrs net->cc_mod.rtcc.bw_bytes = 0; 1352219120Srrs net->cc_mod.rtcc.tls_needs_set = 0; 1353219397Srrs if (net->cc_mod.rtcc.steady_step) { 1354219397Srrs net->cc_mod.rtcc.vol_reduce = 0; 1355219397Srrs net->cc_mod.rtcc.step_cnt = 0; 1356219397Srrs net->cc_mod.rtcc.last_step_state = 0; 1357219397Srrs } 1358219120Srrs if (net->cc_mod.rtcc.ret_from_eq) { 1359219120Srrs /* less aggressive one - reset cwnd too */ 1360219120Srrs uint32_t cwnd_in_mtu, cwnd; 1361219120Srrs 1362219120Srrs cwnd_in_mtu = SCTP_BASE_SYSCTL(sctp_initial_cwnd); 1363219120Srrs if (cwnd_in_mtu == 0) { 1364310218Stuexen /* Using 0 means that the value of RFC 4960 1365310218Stuexen * is used. */ 1366219120Srrs cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND)); 1367219120Srrs } else { 1368219120Srrs /* 1369219120Srrs * We take the minimum of the burst limit 1370219120Srrs * and the initial congestion window. 1371219120Srrs */ 1372219120Srrs if ((stcb->asoc.max_burst > 0) && (cwnd_in_mtu > stcb->asoc.max_burst)) 1373219120Srrs cwnd_in_mtu = stcb->asoc.max_burst; 1374219120Srrs cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu; 1375219120Srrs } 1376219120Srrs if (net->cwnd > cwnd) { 1377310218Stuexen /* Only set if we are not a timeout (i.e. 1378310218Stuexen * down to 1 mtu) */ 1379219120Srrs net->cwnd = cwnd; 1380219120Srrs } 1381219120Srrs } 1382219120Srrs } 1383219120Srrs} 1384219120Srrs 1385219120Srrsstatic void 1386219120Srrssctp_set_rtcc_initial_cc_param(struct sctp_tcb *stcb, 1387219120Srrs struct sctp_nets *net) 1388219120Srrs{ 1389219120Srrs uint64_t vtag, probepoint; 1390219120Srrs 1391219120Srrs sctp_set_initial_cc_param(stcb, net); 1392219120Srrs stcb->asoc.use_precise_time = 1; 1393219120Srrs probepoint = (((uint64_t) net->cwnd) << 32); 1394219120Srrs probepoint |= ((9 << 16) | 0); 1395219120Srrs vtag = (net->rtt << 32) | 1396219120Srrs (((uint32_t) (stcb->sctp_ep->sctp_lport)) << 16) | 1397219120Srrs (stcb->rport); 1398292384Smarkj SDT_PROBE5(sctp, cwnd, net, rttvar, 1399219120Srrs vtag, 1400219120Srrs 0, 1401219120Srrs 0, 1402219120Srrs 0, 1403219120Srrs probepoint); 1404219120Srrs net->cc_mod.rtcc.lbw_rtt = 0; 1405219120Srrs net->cc_mod.rtcc.cwnd_at_bw_set = 0; 1406219397Srrs net->cc_mod.rtcc.vol_reduce = 0; 1407219120Srrs net->cc_mod.rtcc.lbw = 0; 1408219397Srrs net->cc_mod.rtcc.vol_reduce = 0; 1409219397Srrs net->cc_mod.rtcc.bw_bytes_at_last_rttc = 0; 1410219120Srrs net->cc_mod.rtcc.bw_tot_time = 0; 1411219120Srrs net->cc_mod.rtcc.bw_bytes = 0; 1412219120Srrs net->cc_mod.rtcc.tls_needs_set = 0; 1413219120Srrs net->cc_mod.rtcc.ret_from_eq = SCTP_BASE_SYSCTL(sctp_rttvar_eqret); 1414219397Srrs net->cc_mod.rtcc.steady_step = SCTP_BASE_SYSCTL(sctp_steady_step); 1415219397Srrs net->cc_mod.rtcc.use_dccc_ecn = SCTP_BASE_SYSCTL(sctp_use_dccc_ecn); 1416219397Srrs net->cc_mod.rtcc.step_cnt = 0; 1417219397Srrs net->cc_mod.rtcc.last_step_state = 0; 1418219397Srrs 1419219397Srrs 1420219120Srrs} 1421219120Srrs 1422219120Srrsstatic int 1423219120Srrssctp_cwnd_rtcc_socket_option(struct sctp_tcb *stcb, int setorget, 1424219120Srrs struct sctp_cc_option *cc_opt) 1425219120Srrs{ 1426219120Srrs struct sctp_nets *net; 1427219120Srrs 1428219120Srrs if (setorget == 1) { 1429219120Srrs /* a set */ 1430219120Srrs if (cc_opt->option == SCTP_CC_OPT_RTCC_SETMODE) { 1431219120Srrs if ((cc_opt->aid_value.assoc_value != 0) && 1432219120Srrs (cc_opt->aid_value.assoc_value != 1)) { 1433219120Srrs return (EINVAL); 1434219120Srrs } 1435219120Srrs TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1436219120Srrs net->cc_mod.rtcc.ret_from_eq = cc_opt->aid_value.assoc_value; 1437219120Srrs } 1438219120Srrs } else if (cc_opt->option == SCTP_CC_OPT_USE_DCCC_ECN) { 1439219120Srrs if ((cc_opt->aid_value.assoc_value != 0) && 1440219120Srrs (cc_opt->aid_value.assoc_value != 1)) { 1441219120Srrs return (EINVAL); 1442219120Srrs } 1443219120Srrs TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1444219120Srrs net->cc_mod.rtcc.use_dccc_ecn = cc_opt->aid_value.assoc_value; 1445219120Srrs } 1446219397Srrs } else if (cc_opt->option == SCTP_CC_OPT_STEADY_STEP) { 1447219397Srrs TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1448219397Srrs net->cc_mod.rtcc.steady_step = cc_opt->aid_value.assoc_value; 1449219397Srrs } 1450219120Srrs } else { 1451219120Srrs return (EINVAL); 1452219120Srrs } 1453219120Srrs } else { 1454219120Srrs /* a get */ 1455219120Srrs if (cc_opt->option == SCTP_CC_OPT_RTCC_SETMODE) { 1456219120Srrs net = TAILQ_FIRST(&stcb->asoc.nets); 1457219120Srrs if (net == NULL) { 1458219120Srrs return (EFAULT); 1459219120Srrs } 1460219120Srrs cc_opt->aid_value.assoc_value = net->cc_mod.rtcc.ret_from_eq; 1461219120Srrs } else if (cc_opt->option == SCTP_CC_OPT_USE_DCCC_ECN) { 1462219120Srrs net = TAILQ_FIRST(&stcb->asoc.nets); 1463219120Srrs if (net == NULL) { 1464219120Srrs return (EFAULT); 1465219120Srrs } 1466219120Srrs cc_opt->aid_value.assoc_value = net->cc_mod.rtcc.use_dccc_ecn; 1467219397Srrs } else if (cc_opt->option == SCTP_CC_OPT_STEADY_STEP) { 1468219397Srrs net = TAILQ_FIRST(&stcb->asoc.nets); 1469219397Srrs if (net == NULL) { 1470219397Srrs return (EFAULT); 1471219397Srrs } 1472219397Srrs cc_opt->aid_value.assoc_value = net->cc_mod.rtcc.steady_step; 1473219120Srrs } else { 1474219120Srrs return (EINVAL); 1475219120Srrs } 1476219120Srrs } 1477219120Srrs return (0); 1478219120Srrs} 1479219120Srrs 1480219120Srrsstatic void 1481228653Stuexensctp_cwnd_update_rtcc_packet_transmitted(struct sctp_tcb *stcb SCTP_UNUSED, 1482219120Srrs struct sctp_nets *net) 1483219120Srrs{ 1484219120Srrs if (net->cc_mod.rtcc.tls_needs_set == 0) { 1485219120Srrs SCTP_GETPTIME_TIMEVAL(&net->cc_mod.rtcc.tls); 1486219120Srrs net->cc_mod.rtcc.tls_needs_set = 2; 1487219120Srrs } 1488219120Srrs} 1489219120Srrs 1490219120Srrsstatic void 1491219120Srrssctp_cwnd_update_rtcc_after_sack(struct sctp_tcb *stcb, 1492219120Srrs struct sctp_association *asoc, 1493219120Srrs int accum_moved, int reneged_all, int will_exit) 1494219120Srrs{ 1495298942Spfg /* Passing a one argument at the last enables the rtcc algorithm */ 1496219120Srrs sctp_cwnd_update_after_sack_common(stcb, asoc, accum_moved, reneged_all, will_exit, 1); 1497219120Srrs} 1498219120Srrs 1499219397Srrsstatic void 1500228653Stuexensctp_rtt_rtcc_calculated(struct sctp_tcb *stcb SCTP_UNUSED, 1501228653Stuexen struct sctp_nets *net, 1502228653Stuexen struct timeval *now SCTP_UNUSED) 1503219397Srrs{ 1504219397Srrs net->cc_mod.rtcc.rtt_set_this_sack = 1; 1505219397Srrs} 1506219120Srrs 1507219120Srrs/* Here starts Sally Floyds HS-TCP */ 1508219120Srrs 1509171440Srrsstruct sctp_hs_raise_drop { 1510171440Srrs int32_t cwnd; 1511297208Stuexen int8_t increase; 1512297208Stuexen int8_t drop_percent; 1513171440Srrs}; 1514171440Srrs 1515171440Srrs#define SCTP_HS_TABLE_SIZE 73 1516171440Srrs 1517297208Stuexenstatic const struct sctp_hs_raise_drop sctp_cwnd_adjust[SCTP_HS_TABLE_SIZE] = { 1518171440Srrs {38, 1, 50}, /* 0 */ 1519171440Srrs {118, 2, 44}, /* 1 */ 1520171440Srrs {221, 3, 41}, /* 2 */ 1521171440Srrs {347, 4, 38}, /* 3 */ 1522171440Srrs {495, 5, 37}, /* 4 */ 1523171440Srrs {663, 6, 35}, /* 5 */ 1524171440Srrs {851, 7, 34}, /* 6 */ 1525171440Srrs {1058, 8, 33}, /* 7 */ 1526171440Srrs {1284, 9, 32}, /* 8 */ 1527171440Srrs {1529, 10, 31}, /* 9 */ 1528171440Srrs {1793, 11, 30}, /* 10 */ 1529171440Srrs {2076, 12, 29}, /* 11 */ 1530171440Srrs {2378, 13, 28}, /* 12 */ 1531171440Srrs {2699, 14, 28}, /* 13 */ 1532171440Srrs {3039, 15, 27}, /* 14 */ 1533171440Srrs {3399, 16, 27}, /* 15 */ 1534171440Srrs {3778, 17, 26}, /* 16 */ 1535171440Srrs {4177, 18, 26}, /* 17 */ 1536171440Srrs {4596, 19, 25}, /* 18 */ 1537171440Srrs {5036, 20, 25}, /* 19 */ 1538171440Srrs {5497, 21, 24}, /* 20 */ 1539171440Srrs {5979, 22, 24}, /* 21 */ 1540171440Srrs {6483, 23, 23}, /* 22 */ 1541171440Srrs {7009, 24, 23}, /* 23 */ 1542171440Srrs {7558, 25, 22}, /* 24 */ 1543171440Srrs {8130, 26, 22}, /* 25 */ 1544171440Srrs {8726, 27, 22}, /* 26 */ 1545171440Srrs {9346, 28, 21}, /* 27 */ 1546171440Srrs {9991, 29, 21}, /* 28 */ 1547171440Srrs {10661, 30, 21}, /* 29 */ 1548171440Srrs {11358, 31, 20}, /* 30 */ 1549171440Srrs {12082, 32, 20}, /* 31 */ 1550171440Srrs {12834, 33, 20}, /* 32 */ 1551171440Srrs {13614, 34, 19}, /* 33 */ 1552171440Srrs {14424, 35, 19}, /* 34 */ 1553171440Srrs {15265, 36, 19}, /* 35 */ 1554171440Srrs {16137, 37, 19}, /* 36 */ 1555171440Srrs {17042, 38, 18}, /* 37 */ 1556171440Srrs {17981, 39, 18}, /* 38 */ 1557171440Srrs {18955, 40, 18}, /* 39 */ 1558171440Srrs {19965, 41, 17}, /* 40 */ 1559171440Srrs {21013, 42, 17}, /* 41 */ 1560171440Srrs {22101, 43, 17}, /* 42 */ 1561171440Srrs {23230, 44, 17}, /* 43 */ 1562171440Srrs {24402, 45, 16}, /* 44 */ 1563171440Srrs {25618, 46, 16}, /* 45 */ 1564171440Srrs {26881, 47, 16}, /* 46 */ 1565171440Srrs {28193, 48, 16}, /* 47 */ 1566171440Srrs {29557, 49, 15}, /* 48 */ 1567171440Srrs {30975, 50, 15}, /* 49 */ 1568171440Srrs {32450, 51, 15}, /* 50 */ 1569171440Srrs {33986, 52, 15}, /* 51 */ 1570171440Srrs {35586, 53, 14}, /* 52 */ 1571171440Srrs {37253, 54, 14}, /* 53 */ 1572171440Srrs {38992, 55, 14}, /* 54 */ 1573171440Srrs {40808, 56, 14}, /* 55 */ 1574171440Srrs {42707, 57, 13}, /* 56 */ 1575171440Srrs {44694, 58, 13}, /* 57 */ 1576171440Srrs {46776, 59, 13}, /* 58 */ 1577171440Srrs {48961, 60, 13}, /* 59 */ 1578171440Srrs {51258, 61, 13}, /* 60 */ 1579171440Srrs {53677, 62, 12}, /* 61 */ 1580171440Srrs {56230, 63, 12}, /* 62 */ 1581171440Srrs {58932, 64, 12}, /* 63 */ 1582171440Srrs {61799, 65, 12}, /* 64 */ 1583171440Srrs {64851, 66, 11}, /* 65 */ 1584171440Srrs {68113, 67, 11}, /* 66 */ 1585171440Srrs {71617, 68, 11}, /* 67 */ 1586171440Srrs {75401, 69, 10}, /* 68 */ 1587171440Srrs {79517, 70, 10}, /* 69 */ 1588171440Srrs {84035, 71, 10}, /* 70 */ 1589171440Srrs {89053, 72, 10}, /* 71 */ 1590171440Srrs {94717, 73, 9} /* 72 */ 1591171440Srrs}; 1592171440Srrs 1593171440Srrsstatic void 1594171440Srrssctp_hs_cwnd_increase(struct sctp_tcb *stcb, struct sctp_nets *net) 1595171440Srrs{ 1596171440Srrs int cur_val, i, indx, incr; 1597279859Stuexen int old_cwnd = net->cwnd; 1598171440Srrs 1599171440Srrs cur_val = net->cwnd >> 10; 1600171440Srrs indx = SCTP_HS_TABLE_SIZE - 1; 1601234995Stuexen 1602171440Srrs if (cur_val < sctp_cwnd_adjust[0].cwnd) { 1603171440Srrs /* normal mode */ 1604171440Srrs if (net->net_ack > net->mtu) { 1605171440Srrs net->cwnd += net->mtu; 1606171440Srrs } else { 1607171440Srrs net->cwnd += net->net_ack; 1608171440Srrs } 1609171440Srrs } else { 1610171440Srrs for (i = net->last_hs_used; i < SCTP_HS_TABLE_SIZE; i++) { 1611171440Srrs if (cur_val < sctp_cwnd_adjust[i].cwnd) { 1612171440Srrs indx = i; 1613171440Srrs break; 1614171440Srrs } 1615171440Srrs } 1616171440Srrs net->last_hs_used = indx; 1617297208Stuexen incr = (((int32_t) sctp_cwnd_adjust[indx].increase) << 10); 1618171440Srrs net->cwnd += incr; 1619171440Srrs } 1620279859Stuexen sctp_enforce_cwnd_limit(&stcb->asoc, net); 1621279859Stuexen if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1622279859Stuexen sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SS); 1623279859Stuexen } 1624171440Srrs} 1625171440Srrs 1626171440Srrsstatic void 1627171440Srrssctp_hs_cwnd_decrease(struct sctp_tcb *stcb, struct sctp_nets *net) 1628171440Srrs{ 1629171440Srrs int cur_val, i, indx; 1630171440Srrs int old_cwnd = net->cwnd; 1631171440Srrs 1632171440Srrs cur_val = net->cwnd >> 10; 1633171440Srrs if (cur_val < sctp_cwnd_adjust[0].cwnd) { 1634171440Srrs /* normal mode */ 1635171440Srrs net->ssthresh = net->cwnd / 2; 1636171440Srrs if (net->ssthresh < (net->mtu * 2)) { 1637171440Srrs net->ssthresh = 2 * net->mtu; 1638171440Srrs } 1639171440Srrs net->cwnd = net->ssthresh; 1640171440Srrs } else { 1641171440Srrs /* drop by the proper amount */ 1642171440Srrs net->ssthresh = net->cwnd - (int)((net->cwnd / 100) * 1643297208Stuexen (int32_t) sctp_cwnd_adjust[net->last_hs_used].drop_percent); 1644171440Srrs net->cwnd = net->ssthresh; 1645171440Srrs /* now where are we */ 1646171440Srrs indx = net->last_hs_used; 1647171440Srrs cur_val = net->cwnd >> 10; 1648171440Srrs /* reset where we are in the table */ 1649171440Srrs if (cur_val < sctp_cwnd_adjust[0].cwnd) { 1650171440Srrs /* feel out of hs */ 1651171440Srrs net->last_hs_used = 0; 1652171440Srrs } else { 1653171440Srrs for (i = indx; i >= 1; i--) { 1654171440Srrs if (cur_val > sctp_cwnd_adjust[i - 1].cwnd) { 1655171440Srrs break; 1656171440Srrs } 1657171440Srrs } 1658171440Srrs net->last_hs_used = indx; 1659171440Srrs } 1660171440Srrs } 1661279859Stuexen sctp_enforce_cwnd_limit(&stcb->asoc, net); 1662179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1663171440Srrs sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_FR); 1664171440Srrs } 1665171440Srrs} 1666171440Srrs 1667217611Stuexenstatic void 1668171440Srrssctp_hs_cwnd_update_after_fr(struct sctp_tcb *stcb, 1669171440Srrs struct sctp_association *asoc) 1670171440Srrs{ 1671171440Srrs struct sctp_nets *net; 1672171440Srrs 1673171440Srrs /* 1674216669Stuexen * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) && 1675171440Srrs * (net->fast_retran_loss_recovery == 0))) 1676171440Srrs */ 1677171440Srrs TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 1678211944Stuexen if ((asoc->fast_retran_loss_recovery == 0) || 1679216669Stuexen (asoc->sctp_cmt_on_off > 0)) { 1680171440Srrs /* out of a RFC2582 Fast recovery window? */ 1681171440Srrs if (net->net_ack > 0) { 1682171440Srrs /* 1683171440Srrs * per section 7.2.3, are there any 1684171440Srrs * destinations that had a fast retransmit 1685171440Srrs * to them. If so what we need to do is 1686171440Srrs * adjust ssthresh and cwnd. 1687171440Srrs */ 1688171440Srrs struct sctp_tmit_chunk *lchk; 1689171440Srrs 1690171440Srrs sctp_hs_cwnd_decrease(stcb, net); 1691171440Srrs 1692171440Srrs lchk = TAILQ_FIRST(&asoc->send_queue); 1693171440Srrs 1694171440Srrs net->partial_bytes_acked = 0; 1695171440Srrs /* Turn on fast recovery window */ 1696171440Srrs asoc->fast_retran_loss_recovery = 1; 1697171440Srrs if (lchk == NULL) { 1698171440Srrs /* Mark end of the window */ 1699171440Srrs asoc->fast_recovery_tsn = asoc->sending_seq - 1; 1700171440Srrs } else { 1701171440Srrs asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; 1702171440Srrs } 1703171440Srrs 1704171440Srrs /* 1705171440Srrs * CMT fast recovery -- per destination 1706171440Srrs * recovery variable. 1707171440Srrs */ 1708171440Srrs net->fast_retran_loss_recovery = 1; 1709171440Srrs 1710171440Srrs if (lchk == NULL) { 1711171440Srrs /* Mark end of the window */ 1712171440Srrs net->fast_recovery_tsn = asoc->sending_seq - 1; 1713171440Srrs } else { 1714171440Srrs net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; 1715171440Srrs } 1716171440Srrs 1717171440Srrs sctp_timer_stop(SCTP_TIMER_TYPE_SEND, 1718283650Stuexen stcb->sctp_ep, stcb, net, 1719283650Stuexen SCTP_FROM_SCTP_CC_FUNCTIONS + SCTP_LOC_2); 1720171440Srrs sctp_timer_start(SCTP_TIMER_TYPE_SEND, 1721171440Srrs stcb->sctp_ep, stcb, net); 1722171440Srrs } 1723171440Srrs } else if (net->net_ack > 0) { 1724171440Srrs /* 1725171440Srrs * Mark a peg that we WOULD have done a cwnd 1726171440Srrs * reduction but RFC2582 prevented this action. 1727171440Srrs */ 1728171440Srrs SCTP_STAT_INCR(sctps_fastretransinrtt); 1729171440Srrs } 1730171440Srrs } 1731171440Srrs} 1732171440Srrs 1733217611Stuexenstatic void 1734171440Srrssctp_hs_cwnd_update_after_sack(struct sctp_tcb *stcb, 1735171440Srrs struct sctp_association *asoc, 1736228653Stuexen int accum_moved, int reneged_all SCTP_UNUSED, int will_exit) 1737171440Srrs{ 1738171440Srrs struct sctp_nets *net; 1739171440Srrs 1740171440Srrs /******************************/ 1741171440Srrs /* update cwnd and Early FR */ 1742171440Srrs /******************************/ 1743171440Srrs TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 1744171440Srrs 1745171440Srrs#ifdef JANA_CMT_FAST_RECOVERY 1746171440Srrs /* 1747171440Srrs * CMT fast recovery code. Need to debug. 1748171440Srrs */ 1749171440Srrs if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) { 1750217469Stuexen if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) || 1751217469Stuexen SCTP_TSN_GE(net->pseudo_cumack, net->fast_recovery_tsn)) { 1752171440Srrs net->will_exit_fast_recovery = 1; 1753171440Srrs } 1754171440Srrs } 1755171440Srrs#endif 1756171440Srrs /* if nothing was acked on this destination skip it */ 1757171440Srrs if (net->net_ack == 0) { 1758179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 1759171440Srrs sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK); 1760171440Srrs } 1761171440Srrs continue; 1762171440Srrs } 1763171440Srrs#ifdef JANA_CMT_FAST_RECOVERY 1764171440Srrs /* 1765171440Srrs * CMT fast recovery code 1766171440Srrs */ 1767171440Srrs /* 1768216669Stuexen * if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery 1769216669Stuexen * && net->will_exit_fast_recovery == 0) { @@@ Do something 1770216669Stuexen * } else if (sctp_cmt_on_off == 0 && 1771171440Srrs * asoc->fast_retran_loss_recovery && will_exit == 0) { 1772171440Srrs */ 1773171440Srrs#endif 1774171440Srrs 1775211944Stuexen if (asoc->fast_retran_loss_recovery && 1776211944Stuexen (will_exit == 0) && 1777211944Stuexen (asoc->sctp_cmt_on_off == 0)) { 1778171440Srrs /* 1779171440Srrs * If we are in loss recovery we skip any cwnd 1780171440Srrs * update 1781171440Srrs */ 1782224641Stuexen return; 1783171440Srrs } 1784171440Srrs /* 1785171440Srrs * CMT: CUC algorithm. Update cwnd if pseudo-cumack has 1786171440Srrs * moved. 1787171440Srrs */ 1788211944Stuexen if (accum_moved || 1789216669Stuexen ((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) { 1790171440Srrs /* If the cumulative ack moved we can proceed */ 1791171440Srrs if (net->cwnd <= net->ssthresh) { 1792171440Srrs /* We are in slow start */ 1793179157Srrs if (net->flight_size + net->net_ack >= net->cwnd) { 1794171440Srrs sctp_hs_cwnd_increase(stcb, net); 1795171440Srrs } else { 1796179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 1797171440Srrs sctp_log_cwnd(stcb, net, net->net_ack, 1798171440Srrs SCTP_CWND_LOG_NOADV_SS); 1799171440Srrs } 1800171440Srrs } 1801171440Srrs } else { 1802171440Srrs /* We are in congestion avoidance */ 1803179157Srrs net->partial_bytes_acked += net->net_ack; 1804179157Srrs if ((net->flight_size + net->net_ack >= net->cwnd) && 1805179157Srrs (net->partial_bytes_acked >= net->cwnd)) { 1806179157Srrs net->partial_bytes_acked -= net->cwnd; 1807179157Srrs net->cwnd += net->mtu; 1808279859Stuexen sctp_enforce_cwnd_limit(asoc, net); 1809179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1810179157Srrs sctp_log_cwnd(stcb, net, net->mtu, 1811179157Srrs SCTP_CWND_LOG_FROM_CA); 1812171440Srrs } 1813171440Srrs } else { 1814179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 1815171440Srrs sctp_log_cwnd(stcb, net, net->net_ack, 1816171440Srrs SCTP_CWND_LOG_NOADV_CA); 1817171440Srrs } 1818171440Srrs } 1819171440Srrs } 1820171440Srrs } else { 1821179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 1822171440Srrs sctp_log_cwnd(stcb, net, net->mtu, 1823171440Srrs SCTP_CWND_LOG_NO_CUMACK); 1824171440Srrs } 1825171440Srrs } 1826171440Srrs } 1827171440Srrs} 1828171440Srrs 1829171440Srrs 1830171440Srrs/* 1831171440Srrs * H-TCP congestion control. The algorithm is detailed in: 1832171440Srrs * R.N.Shorten, D.J.Leith: 1833171440Srrs * "H-TCP: TCP for high-speed and long-distance networks" 1834171440Srrs * Proc. PFLDnet, Argonne, 2004. 1835171440Srrs * http://www.hamilton.ie/net/htcp3.pdf 1836171440Srrs */ 1837171440Srrs 1838171440Srrs 1839171440Srrsstatic int use_rtt_scaling = 1; 1840171440Srrsstatic int use_bandwidth_switch = 1; 1841171440Srrs 1842171440Srrsstatic inline int 1843171440Srrsbetween(uint32_t seq1, uint32_t seq2, uint32_t seq3) 1844171440Srrs{ 1845228907Stuexen return (seq3 - seq2 >= seq1 - seq2); 1846171440Srrs} 1847171440Srrs 1848171440Srrsstatic inline uint32_t 1849171440Srrshtcp_cong_time(struct htcp *ca) 1850171440Srrs{ 1851228907Stuexen return (sctp_get_tick_count() - ca->last_cong); 1852171440Srrs} 1853171440Srrs 1854171440Srrsstatic inline uint32_t 1855171440Srrshtcp_ccount(struct htcp *ca) 1856171440Srrs{ 1857228907Stuexen return (htcp_cong_time(ca) / ca->minRTT); 1858171440Srrs} 1859171440Srrs 1860171440Srrsstatic inline void 1861171440Srrshtcp_reset(struct htcp *ca) 1862171440Srrs{ 1863171440Srrs ca->undo_last_cong = ca->last_cong; 1864171440Srrs ca->undo_maxRTT = ca->maxRTT; 1865171440Srrs ca->undo_old_maxB = ca->old_maxB; 1866171477Srrs ca->last_cong = sctp_get_tick_count(); 1867171440Srrs} 1868171440Srrs 1869171440Srrs#ifdef SCTP_NOT_USED 1870171440Srrs 1871171440Srrsstatic uint32_t 1872171440Srrshtcp_cwnd_undo(struct sctp_tcb *stcb, struct sctp_nets *net) 1873171440Srrs{ 1874219057Srrs net->cc_mod.htcp_ca.last_cong = net->cc_mod.htcp_ca.undo_last_cong; 1875219057Srrs net->cc_mod.htcp_ca.maxRTT = net->cc_mod.htcp_ca.undo_maxRTT; 1876219057Srrs net->cc_mod.htcp_ca.old_maxB = net->cc_mod.htcp_ca.undo_old_maxB; 1877228907Stuexen return (max(net->cwnd, ((net->ssthresh / net->mtu << 7) / net->cc_mod.htcp_ca.beta) * net->mtu)); 1878171440Srrs} 1879171440Srrs 1880171440Srrs#endif 1881171440Srrs 1882171440Srrsstatic inline void 1883228653Stuexenmeasure_rtt(struct sctp_nets *net) 1884171440Srrs{ 1885219014Stuexen uint32_t srtt = net->lastsa >> SCTP_RTT_SHIFT; 1886171440Srrs 1887171440Srrs /* keep track of minimum RTT seen so far, minRTT is zero at first */ 1888219057Srrs if (net->cc_mod.htcp_ca.minRTT > srtt || !net->cc_mod.htcp_ca.minRTT) 1889219057Srrs net->cc_mod.htcp_ca.minRTT = srtt; 1890171440Srrs 1891171440Srrs /* max RTT */ 1892219057Srrs if (net->fast_retran_ip == 0 && net->ssthresh < 0xFFFF && htcp_ccount(&net->cc_mod.htcp_ca) > 3) { 1893219057Srrs if (net->cc_mod.htcp_ca.maxRTT < net->cc_mod.htcp_ca.minRTT) 1894219057Srrs net->cc_mod.htcp_ca.maxRTT = net->cc_mod.htcp_ca.minRTT; 1895219057Srrs if (net->cc_mod.htcp_ca.maxRTT < srtt && srtt <= net->cc_mod.htcp_ca.maxRTT + MSEC_TO_TICKS(20)) 1896219057Srrs net->cc_mod.htcp_ca.maxRTT = srtt; 1897171440Srrs } 1898171440Srrs} 1899171440Srrs 1900171440Srrsstatic void 1901228653Stuexenmeasure_achieved_throughput(struct sctp_nets *net) 1902171440Srrs{ 1903171477Srrs uint32_t now = sctp_get_tick_count(); 1904171440Srrs 1905171440Srrs if (net->fast_retran_ip == 0) 1906219057Srrs net->cc_mod.htcp_ca.bytes_acked = net->net_ack; 1907171440Srrs 1908171440Srrs if (!use_bandwidth_switch) 1909171440Srrs return; 1910171440Srrs 1911171440Srrs /* achieved throughput calculations */ 1912171440Srrs /* JRS - not 100% sure of this statement */ 1913171440Srrs if (net->fast_retran_ip == 1) { 1914219057Srrs net->cc_mod.htcp_ca.bytecount = 0; 1915219057Srrs net->cc_mod.htcp_ca.lasttime = now; 1916171440Srrs return; 1917171440Srrs } 1918219057Srrs net->cc_mod.htcp_ca.bytecount += net->net_ack; 1919240158Stuexen 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)) && 1920240158Stuexen (now - net->cc_mod.htcp_ca.lasttime >= net->cc_mod.htcp_ca.minRTT) && 1921240158Stuexen (net->cc_mod.htcp_ca.minRTT > 0)) { 1922219057Srrs uint32_t cur_Bi = net->cc_mod.htcp_ca.bytecount / net->mtu * hz / (now - net->cc_mod.htcp_ca.lasttime); 1923171440Srrs 1924219057Srrs if (htcp_ccount(&net->cc_mod.htcp_ca) <= 3) { 1925171440Srrs /* just after backoff */ 1926219057Srrs net->cc_mod.htcp_ca.minB = net->cc_mod.htcp_ca.maxB = net->cc_mod.htcp_ca.Bi = cur_Bi; 1927171440Srrs } else { 1928219057Srrs net->cc_mod.htcp_ca.Bi = (3 * net->cc_mod.htcp_ca.Bi + cur_Bi) / 4; 1929219057Srrs if (net->cc_mod.htcp_ca.Bi > net->cc_mod.htcp_ca.maxB) 1930219057Srrs net->cc_mod.htcp_ca.maxB = net->cc_mod.htcp_ca.Bi; 1931219057Srrs if (net->cc_mod.htcp_ca.minB > net->cc_mod.htcp_ca.maxB) 1932219057Srrs net->cc_mod.htcp_ca.minB = net->cc_mod.htcp_ca.maxB; 1933171440Srrs } 1934219057Srrs net->cc_mod.htcp_ca.bytecount = 0; 1935219057Srrs net->cc_mod.htcp_ca.lasttime = now; 1936171440Srrs } 1937171440Srrs} 1938171440Srrs 1939171440Srrsstatic inline void 1940171440Srrshtcp_beta_update(struct htcp *ca, uint32_t minRTT, uint32_t maxRTT) 1941171440Srrs{ 1942171440Srrs if (use_bandwidth_switch) { 1943171440Srrs uint32_t maxB = ca->maxB; 1944171440Srrs uint32_t old_maxB = ca->old_maxB; 1945171440Srrs 1946171440Srrs ca->old_maxB = ca->maxB; 1947171440Srrs 1948171440Srrs if (!between(5 * maxB, 4 * old_maxB, 6 * old_maxB)) { 1949171440Srrs ca->beta = BETA_MIN; 1950171440Srrs ca->modeswitch = 0; 1951171440Srrs return; 1952171440Srrs } 1953171440Srrs } 1954171440Srrs if (ca->modeswitch && minRTT > (uint32_t) MSEC_TO_TICKS(10) && maxRTT) { 1955171440Srrs ca->beta = (minRTT << 7) / maxRTT; 1956171440Srrs if (ca->beta < BETA_MIN) 1957171440Srrs ca->beta = BETA_MIN; 1958171440Srrs else if (ca->beta > BETA_MAX) 1959171440Srrs ca->beta = BETA_MAX; 1960171440Srrs } else { 1961171440Srrs ca->beta = BETA_MIN; 1962171440Srrs ca->modeswitch = 1; 1963171440Srrs } 1964171440Srrs} 1965171440Srrs 1966171440Srrsstatic inline void 1967171440Srrshtcp_alpha_update(struct htcp *ca) 1968171440Srrs{ 1969171440Srrs uint32_t minRTT = ca->minRTT; 1970171440Srrs uint32_t factor = 1; 1971171440Srrs uint32_t diff = htcp_cong_time(ca); 1972171440Srrs 1973171440Srrs if (diff > (uint32_t) hz) { 1974171440Srrs diff -= hz; 1975171440Srrs factor = 1 + (10 * diff + ((diff / 2) * (diff / 2) / hz)) / hz; 1976171440Srrs } 1977171440Srrs if (use_rtt_scaling && minRTT) { 1978171440Srrs uint32_t scale = (hz << 3) / (10 * minRTT); 1979171440Srrs 1980171440Srrs scale = min(max(scale, 1U << 2), 10U << 3); /* clamping ratio to 1981171440Srrs * interval [0.5,10]<<3 */ 1982171440Srrs factor = (factor << 3) / scale; 1983171440Srrs if (!factor) 1984171440Srrs factor = 1; 1985171440Srrs } 1986171440Srrs ca->alpha = 2 * factor * ((1 << 7) - ca->beta); 1987171440Srrs if (!ca->alpha) 1988171440Srrs ca->alpha = ALPHA_BASE; 1989171440Srrs} 1990171440Srrs 1991171440Srrs/* After we have the rtt data to calculate beta, we'd still prefer to wait one 1992171440Srrs * rtt before we adjust our beta to ensure we are working from a consistent 1993171440Srrs * data. 1994171440Srrs * 1995171440Srrs * This function should be called when we hit a congestion event since only at 1996171440Srrs * that point do we really have a real sense of maxRTT (the queues en route 1997171440Srrs * were getting just too full now). 1998171440Srrs */ 1999171440Srrsstatic void 2000228653Stuexenhtcp_param_update(struct sctp_nets *net) 2001171440Srrs{ 2002219057Srrs uint32_t minRTT = net->cc_mod.htcp_ca.minRTT; 2003219057Srrs uint32_t maxRTT = net->cc_mod.htcp_ca.maxRTT; 2004171440Srrs 2005219057Srrs htcp_beta_update(&net->cc_mod.htcp_ca, minRTT, maxRTT); 2006219057Srrs htcp_alpha_update(&net->cc_mod.htcp_ca); 2007171440Srrs 2008310218Stuexen /* add slowly fading memory for maxRTT to accommodate routing 2009310218Stuexen * changes etc */ 2010171440Srrs if (minRTT > 0 && maxRTT > minRTT) 2011219057Srrs net->cc_mod.htcp_ca.maxRTT = minRTT + ((maxRTT - minRTT) * 95) / 100; 2012171440Srrs} 2013171440Srrs 2014171440Srrsstatic uint32_t 2015228653Stuexenhtcp_recalc_ssthresh(struct sctp_nets *net) 2016171440Srrs{ 2017228653Stuexen htcp_param_update(net); 2018228907Stuexen return (max(((net->cwnd / net->mtu * net->cc_mod.htcp_ca.beta) >> 7) * net->mtu, 2U * net->mtu)); 2019171440Srrs} 2020171440Srrs 2021171440Srrsstatic void 2022171440Srrshtcp_cong_avoid(struct sctp_tcb *stcb, struct sctp_nets *net) 2023171440Srrs{ 2024171440Srrs /*- 2025171440Srrs * How to handle these functions? 2026171440Srrs * if (!tcp_is_cwnd_limited(sk, in_flight)) RRS - good question. 2027171440Srrs * return; 2028171440Srrs */ 2029171440Srrs if (net->cwnd <= net->ssthresh) { 2030171440Srrs /* We are in slow start */ 2031171440Srrs if (net->flight_size + net->net_ack >= net->cwnd) { 2032179783Srrs if (net->net_ack > (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable))) { 2033179783Srrs net->cwnd += (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable)); 2034179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 2035171440Srrs sctp_log_cwnd(stcb, net, net->mtu, 2036171440Srrs SCTP_CWND_LOG_FROM_SS); 2037171440Srrs } 2038171440Srrs } else { 2039171440Srrs net->cwnd += net->net_ack; 2040179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 2041171440Srrs sctp_log_cwnd(stcb, net, net->net_ack, 2042171440Srrs SCTP_CWND_LOG_FROM_SS); 2043171440Srrs } 2044171440Srrs } 2045279859Stuexen sctp_enforce_cwnd_limit(&stcb->asoc, net); 2046171440Srrs } else { 2047179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 2048171440Srrs sctp_log_cwnd(stcb, net, net->net_ack, 2049171440Srrs SCTP_CWND_LOG_NOADV_SS); 2050171440Srrs } 2051171440Srrs } 2052171440Srrs } else { 2053228653Stuexen measure_rtt(net); 2054171440Srrs 2055171440Srrs /* 2056171440Srrs * In dangerous area, increase slowly. In theory this is 2057171440Srrs * net->cwnd += alpha / net->cwnd 2058171440Srrs */ 2059171440Srrs /* What is snd_cwnd_cnt?? */ 2060219057Srrs if (((net->partial_bytes_acked / net->mtu * net->cc_mod.htcp_ca.alpha) >> 7) * net->mtu >= net->cwnd) { 2061171440Srrs /*- 2062171440Srrs * Does SCTP have a cwnd clamp? 2063171440Srrs * if (net->snd_cwnd < net->snd_cwnd_clamp) - Nope (RRS). 2064171440Srrs */ 2065171440Srrs net->cwnd += net->mtu; 2066171440Srrs net->partial_bytes_acked = 0; 2067279859Stuexen sctp_enforce_cwnd_limit(&stcb->asoc, net); 2068219057Srrs htcp_alpha_update(&net->cc_mod.htcp_ca); 2069179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 2070171440Srrs sctp_log_cwnd(stcb, net, net->mtu, 2071171440Srrs SCTP_CWND_LOG_FROM_CA); 2072171440Srrs } 2073171440Srrs } else { 2074171440Srrs net->partial_bytes_acked += net->net_ack; 2075179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 2076171440Srrs sctp_log_cwnd(stcb, net, net->net_ack, 2077171440Srrs SCTP_CWND_LOG_NOADV_CA); 2078171440Srrs } 2079171440Srrs } 2080171440Srrs 2081219057Srrs net->cc_mod.htcp_ca.bytes_acked = net->mtu; 2082171440Srrs } 2083171440Srrs} 2084171440Srrs 2085171440Srrs#ifdef SCTP_NOT_USED 2086171440Srrs/* Lower bound on congestion window. */ 2087171440Srrsstatic uint32_t 2088171440Srrshtcp_min_cwnd(struct sctp_tcb *stcb, struct sctp_nets *net) 2089171440Srrs{ 2090228907Stuexen return (net->ssthresh); 2091171440Srrs} 2092171440Srrs#endif 2093171440Srrs 2094171440Srrsstatic void 2095228653Stuexenhtcp_init(struct sctp_nets *net) 2096171440Srrs{ 2097219057Srrs memset(&net->cc_mod.htcp_ca, 0, sizeof(struct htcp)); 2098219057Srrs net->cc_mod.htcp_ca.alpha = ALPHA_BASE; 2099219057Srrs net->cc_mod.htcp_ca.beta = BETA_MIN; 2100219057Srrs net->cc_mod.htcp_ca.bytes_acked = net->mtu; 2101219057Srrs net->cc_mod.htcp_ca.last_cong = sctp_get_tick_count(); 2102171440Srrs} 2103171440Srrs 2104217611Stuexenstatic void 2105171440Srrssctp_htcp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net) 2106171440Srrs{ 2107171440Srrs /* 2108171440Srrs * We take the max of the burst limit times a MTU or the 2109171440Srrs * INITIAL_CWND. We then limit this to 4 MTU's of sending. 2110171440Srrs */ 2111171440Srrs net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND)); 2112171440Srrs net->ssthresh = stcb->asoc.peers_rwnd; 2113279859Stuexen sctp_enforce_cwnd_limit(&stcb->asoc, net); 2114228653Stuexen htcp_init(net); 2115171440Srrs 2116179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 2117171440Srrs sctp_log_cwnd(stcb, net, 0, SCTP_CWND_INITIALIZATION); 2118171440Srrs } 2119171440Srrs} 2120171440Srrs 2121217611Stuexenstatic void 2122171440Srrssctp_htcp_cwnd_update_after_sack(struct sctp_tcb *stcb, 2123171440Srrs struct sctp_association *asoc, 2124228653Stuexen int accum_moved, int reneged_all SCTP_UNUSED, int will_exit) 2125171440Srrs{ 2126171440Srrs struct sctp_nets *net; 2127171440Srrs 2128171440Srrs /******************************/ 2129171440Srrs /* update cwnd and Early FR */ 2130171440Srrs /******************************/ 2131171440Srrs TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 2132171440Srrs 2133171440Srrs#ifdef JANA_CMT_FAST_RECOVERY 2134171440Srrs /* 2135171440Srrs * CMT fast recovery code. Need to debug. 2136171440Srrs */ 2137171440Srrs if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) { 2138217469Stuexen if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) || 2139217469Stuexen SCTP_TSN_GE(net->pseudo_cumack, net->fast_recovery_tsn)) { 2140171440Srrs net->will_exit_fast_recovery = 1; 2141171440Srrs } 2142171440Srrs } 2143171440Srrs#endif 2144171440Srrs /* if nothing was acked on this destination skip it */ 2145171440Srrs if (net->net_ack == 0) { 2146179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 2147171440Srrs sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK); 2148171440Srrs } 2149171440Srrs continue; 2150171440Srrs } 2151171440Srrs#ifdef JANA_CMT_FAST_RECOVERY 2152171440Srrs /* 2153171440Srrs * CMT fast recovery code 2154171440Srrs */ 2155171440Srrs /* 2156216669Stuexen * if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery 2157216669Stuexen * && net->will_exit_fast_recovery == 0) { @@@ Do something 2158216669Stuexen * } else if (sctp_cmt_on_off == 0 && 2159171440Srrs * asoc->fast_retran_loss_recovery && will_exit == 0) { 2160171440Srrs */ 2161171440Srrs#endif 2162171440Srrs 2163211944Stuexen if (asoc->fast_retran_loss_recovery && 2164211944Stuexen will_exit == 0 && 2165211944Stuexen (asoc->sctp_cmt_on_off == 0)) { 2166171440Srrs /* 2167171440Srrs * If we are in loss recovery we skip any cwnd 2168171440Srrs * update 2169171440Srrs */ 2170224641Stuexen return; 2171171440Srrs } 2172171440Srrs /* 2173171440Srrs * CMT: CUC algorithm. Update cwnd if pseudo-cumack has 2174171440Srrs * moved. 2175171440Srrs */ 2176211944Stuexen if (accum_moved || 2177216669Stuexen ((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) { 2178171440Srrs htcp_cong_avoid(stcb, net); 2179228653Stuexen measure_achieved_throughput(net); 2180171440Srrs } else { 2181179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 2182171440Srrs sctp_log_cwnd(stcb, net, net->mtu, 2183171440Srrs SCTP_CWND_LOG_NO_CUMACK); 2184171440Srrs } 2185171440Srrs } 2186171440Srrs } 2187171440Srrs} 2188171440Srrs 2189217611Stuexenstatic void 2190171440Srrssctp_htcp_cwnd_update_after_fr(struct sctp_tcb *stcb, 2191171440Srrs struct sctp_association *asoc) 2192171440Srrs{ 2193171440Srrs struct sctp_nets *net; 2194171440Srrs 2195171440Srrs /* 2196216669Stuexen * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) && 2197171440Srrs * (net->fast_retran_loss_recovery == 0))) 2198171440Srrs */ 2199171440Srrs TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 2200211944Stuexen if ((asoc->fast_retran_loss_recovery == 0) || 2201216669Stuexen (asoc->sctp_cmt_on_off > 0)) { 2202171440Srrs /* out of a RFC2582 Fast recovery window? */ 2203171440Srrs if (net->net_ack > 0) { 2204171440Srrs /* 2205171440Srrs * per section 7.2.3, are there any 2206171440Srrs * destinations that had a fast retransmit 2207171440Srrs * to them. If so what we need to do is 2208171440Srrs * adjust ssthresh and cwnd. 2209171440Srrs */ 2210171440Srrs struct sctp_tmit_chunk *lchk; 2211171440Srrs int old_cwnd = net->cwnd; 2212171440Srrs 2213171440Srrs /* JRS - reset as if state were changed */ 2214219057Srrs htcp_reset(&net->cc_mod.htcp_ca); 2215228653Stuexen net->ssthresh = htcp_recalc_ssthresh(net); 2216171440Srrs net->cwnd = net->ssthresh; 2217279859Stuexen sctp_enforce_cwnd_limit(asoc, net); 2218179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 2219171440Srrs sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), 2220171440Srrs SCTP_CWND_LOG_FROM_FR); 2221171440Srrs } 2222171440Srrs lchk = TAILQ_FIRST(&asoc->send_queue); 2223171440Srrs 2224171440Srrs net->partial_bytes_acked = 0; 2225171440Srrs /* Turn on fast recovery window */ 2226171440Srrs asoc->fast_retran_loss_recovery = 1; 2227171440Srrs if (lchk == NULL) { 2228171440Srrs /* Mark end of the window */ 2229171440Srrs asoc->fast_recovery_tsn = asoc->sending_seq - 1; 2230171440Srrs } else { 2231171440Srrs asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; 2232171440Srrs } 2233171440Srrs 2234171440Srrs /* 2235171440Srrs * CMT fast recovery -- per destination 2236171440Srrs * recovery variable. 2237171440Srrs */ 2238171440Srrs net->fast_retran_loss_recovery = 1; 2239171440Srrs 2240171440Srrs if (lchk == NULL) { 2241171440Srrs /* Mark end of the window */ 2242171440Srrs net->fast_recovery_tsn = asoc->sending_seq - 1; 2243171440Srrs } else { 2244171440Srrs net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; 2245171440Srrs } 2246171440Srrs 2247171440Srrs sctp_timer_stop(SCTP_TIMER_TYPE_SEND, 2248283650Stuexen stcb->sctp_ep, stcb, net, 2249283650Stuexen SCTP_FROM_SCTP_CC_FUNCTIONS + SCTP_LOC_3); 2250171440Srrs sctp_timer_start(SCTP_TIMER_TYPE_SEND, 2251171440Srrs stcb->sctp_ep, stcb, net); 2252171440Srrs } 2253171440Srrs } else if (net->net_ack > 0) { 2254171440Srrs /* 2255171440Srrs * Mark a peg that we WOULD have done a cwnd 2256171440Srrs * reduction but RFC2582 prevented this action. 2257171440Srrs */ 2258171440Srrs SCTP_STAT_INCR(sctps_fastretransinrtt); 2259171440Srrs } 2260171440Srrs } 2261171440Srrs} 2262171440Srrs 2263217611Stuexenstatic void 2264171440Srrssctp_htcp_cwnd_update_after_timeout(struct sctp_tcb *stcb, 2265171440Srrs struct sctp_nets *net) 2266171440Srrs{ 2267171440Srrs int old_cwnd = net->cwnd; 2268171440Srrs 2269171440Srrs /* JRS - reset as if the state were being changed to timeout */ 2270219057Srrs htcp_reset(&net->cc_mod.htcp_ca); 2271228653Stuexen net->ssthresh = htcp_recalc_ssthresh(net); 2272171440Srrs net->cwnd = net->mtu; 2273179157Srrs net->partial_bytes_acked = 0; 2274179783Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 2275171440Srrs sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX); 2276171440Srrs } 2277171440Srrs} 2278171440Srrs 2279217611Stuexenstatic void 2280171440Srrssctp_htcp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb, 2281228653Stuexen struct sctp_nets *net, int in_window, int num_pkt_lost SCTP_UNUSED) 2282171440Srrs{ 2283171440Srrs int old_cwnd; 2284171440Srrs 2285171440Srrs old_cwnd = net->cwnd; 2286171440Srrs 2287171440Srrs /* JRS - reset hctp as if state changed */ 2288218129Srrs if (in_window == 0) { 2289219057Srrs htcp_reset(&net->cc_mod.htcp_ca); 2290218129Srrs SCTP_STAT_INCR(sctps_ecnereducedcwnd); 2291228653Stuexen net->ssthresh = htcp_recalc_ssthresh(net); 2292218129Srrs if (net->ssthresh < net->mtu) { 2293218129Srrs net->ssthresh = net->mtu; 2294218129Srrs /* here back off the timer as well, to slow us down */ 2295218129Srrs net->RTO <<= 1; 2296218129Srrs } 2297218129Srrs net->cwnd = net->ssthresh; 2298279859Stuexen sctp_enforce_cwnd_limit(&stcb->asoc, net); 2299218129Srrs if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 2300218129Srrs sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); 2301218129Srrs } 2302171440Srrs } 2303171440Srrs} 2304217611Stuexen 2305297208Stuexenconst struct sctp_cc_functions sctp_cc_functions[] = { 2306217611Stuexen { 2307217611Stuexen .sctp_set_initial_cc_param = sctp_set_initial_cc_param, 2308217611Stuexen .sctp_cwnd_update_after_sack = sctp_cwnd_update_after_sack, 2309224641Stuexen .sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common, 2310217611Stuexen .sctp_cwnd_update_after_fr = sctp_cwnd_update_after_fr, 2311217611Stuexen .sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout, 2312217611Stuexen .sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_after_ecn_echo, 2313217611Stuexen .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped, 2314217611Stuexen .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output, 2315217611Stuexen }, 2316217611Stuexen { 2317217611Stuexen .sctp_set_initial_cc_param = sctp_set_initial_cc_param, 2318217611Stuexen .sctp_cwnd_update_after_sack = sctp_hs_cwnd_update_after_sack, 2319224641Stuexen .sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common, 2320217611Stuexen .sctp_cwnd_update_after_fr = sctp_hs_cwnd_update_after_fr, 2321217611Stuexen .sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout, 2322217611Stuexen .sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_after_ecn_echo, 2323217611Stuexen .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped, 2324217611Stuexen .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output, 2325217611Stuexen }, 2326217611Stuexen { 2327217611Stuexen .sctp_set_initial_cc_param = sctp_htcp_set_initial_cc_param, 2328217611Stuexen .sctp_cwnd_update_after_sack = sctp_htcp_cwnd_update_after_sack, 2329224641Stuexen .sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common, 2330217611Stuexen .sctp_cwnd_update_after_fr = sctp_htcp_cwnd_update_after_fr, 2331217611Stuexen .sctp_cwnd_update_after_timeout = sctp_htcp_cwnd_update_after_timeout, 2332217611Stuexen .sctp_cwnd_update_after_ecn_echo = sctp_htcp_cwnd_update_after_ecn_echo, 2333217611Stuexen .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped, 2334217611Stuexen .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output, 2335219120Srrs }, 2336219120Srrs { 2337219120Srrs .sctp_set_initial_cc_param = sctp_set_rtcc_initial_cc_param, 2338219120Srrs .sctp_cwnd_update_after_sack = sctp_cwnd_update_rtcc_after_sack, 2339224641Stuexen .sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common, 2340219120Srrs .sctp_cwnd_update_after_fr = sctp_cwnd_update_after_fr, 2341219120Srrs .sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout, 2342219120Srrs .sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_rtcc_after_ecn_echo, 2343219120Srrs .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped, 2344219120Srrs .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output, 2345219120Srrs .sctp_cwnd_update_packet_transmitted = sctp_cwnd_update_rtcc_packet_transmitted, 2346219120Srrs .sctp_cwnd_update_tsn_acknowledged = sctp_cwnd_update_rtcc_tsn_acknowledged, 2347219120Srrs .sctp_cwnd_new_transmission_begins = sctp_cwnd_new_rtcc_transmission_begins, 2348219120Srrs .sctp_cwnd_prepare_net_for_sack = sctp_cwnd_prepare_rtcc_net_for_sack, 2349219397Srrs .sctp_cwnd_socket_option = sctp_cwnd_rtcc_socket_option, 2350219397Srrs .sctp_rtt_calculated = sctp_rtt_rtcc_calculated 2351217611Stuexen } 2352217611Stuexen}; 2353