The Tor Browser / annotate

netwerk/sctp/src/netinet/sctp_cc_functions.c@ac0c01689b40 (annotated)

netwerk/sctp/src/netinet/sctp_cc_functions.c

Thu, 15 Jan 2015 15:59:08 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Thu, 15 Jan 2015 15:59:08 +0100
branch
TOR_BUG_9701
changeset 10
ac0c01689b40
permissions
-rwxr-xr-x

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0 1 /*-
michael@0 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
michael@0 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
michael@0 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
michael@0 5 *
michael@0 6 * Redistribution and use in source and binary forms, with or without
michael@0 7 * modification, are permitted provided that the following conditions are met:
michael@0 8 *
michael@0 9 * a) Redistributions of source code must retain the above copyright notice,
michael@0 10 * this list of conditions and the following disclaimer.
michael@0 11 *
michael@0 12 * b) Redistributions in binary form must reproduce the above copyright
michael@0 13 * notice, this list of conditions and the following disclaimer in
michael@0 14 * the documentation and/or other materials provided with the distribution.
michael@0 15 *
michael@0 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its
michael@0 17 * contributors may be used to endorse or promote products derived
michael@0 18 * from this software without specific prior written permission.
michael@0 19 *
michael@0 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
michael@0 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
michael@0 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
michael@0 30 * THE POSSIBILITY OF SUCH DAMAGE.
michael@0 31 */
michael@0 32
michael@0 33 #ifdef __FreeBSD__
michael@0 34 #include <sys/cdefs.h>
michael@0 35 __FBSDID("$FreeBSD: head/sys/netinet/sctp_cc_functions.c 240158 2012-09-06 07:03:56Z tuexen $");
michael@0 36 #endif
michael@0 37
michael@0 38 #include <netinet/sctp_os.h>
michael@0 39 #include <netinet/sctp_var.h>
michael@0 40 #include <netinet/sctp_sysctl.h>
michael@0 41 #include <netinet/sctp_pcb.h>
michael@0 42 #include <netinet/sctp_header.h>
michael@0 43 #include <netinet/sctputil.h>
michael@0 44 #include <netinet/sctp_output.h>
michael@0 45 #include <netinet/sctp_input.h>
michael@0 46 #include <netinet/sctp_indata.h>
michael@0 47 #include <netinet/sctp_uio.h>
michael@0 48 #include <netinet/sctp_timer.h>
michael@0 49 #include <netinet/sctp_auth.h>
michael@0 50 #include <netinet/sctp_asconf.h>
michael@0 51 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 52 #include <netinet/sctp_dtrace_declare.h>
michael@0 53 #endif
michael@0 54
michael@0 55 #define SHIFT_MPTCP_MULTI_N 40
michael@0 56 #define SHIFT_MPTCP_MULTI_Z 16
michael@0 57 #define SHIFT_MPTCP_MULTI 8
michael@0 58
michael@0 59 static void
michael@0 60 sctp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net)
michael@0 61 {
michael@0 62 struct sctp_association *assoc;
michael@0 63 uint32_t cwnd_in_mtu;
michael@0 64
michael@0 65 assoc = &stcb->asoc;
michael@0 66 cwnd_in_mtu = SCTP_BASE_SYSCTL(sctp_initial_cwnd);
michael@0 67 if (cwnd_in_mtu == 0) {
michael@0 68 /* Using 0 means that the value of RFC 4960 is used. */
michael@0 69 net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND));
michael@0 70 } else {
michael@0 71 /*
michael@0 72 * We take the minimum of the burst limit and the
michael@0 73 * initial congestion window.
michael@0 74 */
michael@0 75 if ((assoc->max_burst > 0) && (cwnd_in_mtu > assoc->max_burst))
michael@0 76 cwnd_in_mtu = assoc->max_burst;
michael@0 77 net->cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu;
michael@0 78 }
michael@0 79 if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) ||
michael@0 80 (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2)) {
michael@0 81 /* In case of resource pooling initialize appropriately */
michael@0 82 net->cwnd /= assoc->numnets;
michael@0 83 if (net->cwnd < (net->mtu - sizeof(struct sctphdr))) {
michael@0 84 net->cwnd = net->mtu - sizeof(struct sctphdr);
michael@0 85 }
michael@0 86 }
michael@0 87 net->ssthresh = assoc->peers_rwnd;
michael@0 88 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 89 SDT_PROBE(sctp, cwnd, net, init,
michael@0 90 stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net,
michael@0 91 0, net->cwnd);
michael@0 92 #endif
michael@0 93 if (SCTP_BASE_SYSCTL(sctp_logging_level) &
michael@0 94 (SCTP_CWND_MONITOR_ENABLE|SCTP_CWND_LOGGING_ENABLE)) {
michael@0 95 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_INITIALIZATION);
michael@0 96 }
michael@0 97 }
michael@0 98
michael@0 99 static void
michael@0 100 sctp_cwnd_update_after_fr(struct sctp_tcb *stcb,
michael@0 101 struct sctp_association *asoc)
michael@0 102 {
michael@0 103 struct sctp_nets *net;
michael@0 104 uint32_t t_ssthresh, t_cwnd;
michael@0 105 uint64_t t_ucwnd_sbw;
michael@0 106
michael@0 107 /* MT FIXME: Don't compute this over and over again */
michael@0 108 t_ssthresh = 0;
michael@0 109 t_cwnd = 0;
michael@0 110 t_ucwnd_sbw = 0;
michael@0 111 if ((asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) ||
michael@0 112 (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2)) {
michael@0 113 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
michael@0 114 t_ssthresh += net->ssthresh;
michael@0 115 t_cwnd += net->cwnd;
michael@0 116 if (net->lastsa > 0) {
michael@0 117 t_ucwnd_sbw += (uint64_t)net->cwnd / (uint64_t)net->lastsa;
michael@0 118 }
michael@0 119 }
michael@0 120 if (t_ucwnd_sbw == 0) {
michael@0 121 t_ucwnd_sbw = 1;
michael@0 122 }
michael@0 123 }
michael@0 124
michael@0 125 /*-
michael@0 126 * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) &&
michael@0 127 * (net->fast_retran_loss_recovery == 0)))
michael@0 128 */
michael@0 129 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
michael@0 130 if ((asoc->fast_retran_loss_recovery == 0) ||
michael@0 131 (asoc->sctp_cmt_on_off > 0)) {
michael@0 132 /* out of a RFC2582 Fast recovery window? */
michael@0 133 if (net->net_ack > 0) {
michael@0 134 /*
michael@0 135 * per section 7.2.3, are there any
michael@0 136 * destinations that had a fast retransmit
michael@0 137 * to them. If so what we need to do is
michael@0 138 * adjust ssthresh and cwnd.
michael@0 139 */
michael@0 140 struct sctp_tmit_chunk *lchk;
michael@0 141 int old_cwnd = net->cwnd;
michael@0 142
michael@0 143 if ((asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) ||
michael@0 144 (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2)) {
michael@0 145 if (asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) {
michael@0 146 net->ssthresh = (uint32_t)(((uint64_t)4 *
michael@0 147 (uint64_t)net->mtu *
michael@0 148 (uint64_t)net->ssthresh) /
michael@0 149 (uint64_t)t_ssthresh);
michael@0 150
michael@0 151 }
michael@0 152 if (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2) {
michael@0 153 uint32_t srtt;
michael@0 154
michael@0 155 srtt = net->lastsa;
michael@0 156 /* lastsa>>3; we don't need to devide ...*/
michael@0 157 if (srtt == 0) {
michael@0 158 srtt = 1;
michael@0 159 }
michael@0 160 /* Short Version => Equal to Contel Version MBe */
michael@0 161 net->ssthresh = (uint32_t) (((uint64_t)4 *
michael@0 162 (uint64_t)net->mtu *
michael@0 163 (uint64_t)net->cwnd) /
michael@0 164 ((uint64_t)srtt *
michael@0 165 t_ucwnd_sbw));
michael@0 166 /* INCREASE FACTOR */;
michael@0 167 }
michael@0 168 if ((net->cwnd > t_cwnd / 2) &&
michael@0 169 (net->ssthresh < net->cwnd - t_cwnd / 2)) {
michael@0 170 net->ssthresh = net->cwnd - t_cwnd / 2;
michael@0 171 }
michael@0 172 if (net->ssthresh < net->mtu) {
michael@0 173 net->ssthresh = net->mtu;
michael@0 174 }
michael@0 175 } else {
michael@0 176 net->ssthresh = net->cwnd / 2;
michael@0 177 if (net->ssthresh < (net->mtu * 2)) {
michael@0 178 net->ssthresh = 2 * net->mtu;
michael@0 179 }
michael@0 180 }
michael@0 181 net->cwnd = net->ssthresh;
michael@0 182 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 183 SDT_PROBE(sctp, cwnd, net, fr,
michael@0 184 stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net,
michael@0 185 old_cwnd, net->cwnd);
michael@0 186 #endif
michael@0 187 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 188 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd),
michael@0 189 SCTP_CWND_LOG_FROM_FR);
michael@0 190 }
michael@0 191 lchk = TAILQ_FIRST(&asoc->send_queue);
michael@0 192
michael@0 193 net->partial_bytes_acked = 0;
michael@0 194 /* Turn on fast recovery window */
michael@0 195 asoc->fast_retran_loss_recovery = 1;
michael@0 196 if (lchk == NULL) {
michael@0 197 /* Mark end of the window */
michael@0 198 asoc->fast_recovery_tsn = asoc->sending_seq - 1;
michael@0 199 } else {
michael@0 200 asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1;
michael@0 201 }
michael@0 202
michael@0 203 /*
michael@0 204 * CMT fast recovery -- per destination
michael@0 205 * recovery variable.
michael@0 206 */
michael@0 207 net->fast_retran_loss_recovery = 1;
michael@0 208
michael@0 209 if (lchk == NULL) {
michael@0 210 /* Mark end of the window */
michael@0 211 net->fast_recovery_tsn = asoc->sending_seq - 1;
michael@0 212 } else {
michael@0 213 net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1;
michael@0 214 }
michael@0 215
michael@0 216 sctp_timer_stop(SCTP_TIMER_TYPE_SEND,
michael@0 217 stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA+SCTP_LOC_32 );
michael@0 218 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
michael@0 219 stcb->sctp_ep, stcb, net);
michael@0 220 }
michael@0 221 } else if (net->net_ack > 0) {
michael@0 222 /*
michael@0 223 * Mark a peg that we WOULD have done a cwnd
michael@0 224 * reduction but RFC2582 prevented this action.
michael@0 225 */
michael@0 226 SCTP_STAT_INCR(sctps_fastretransinrtt);
michael@0 227 }
michael@0 228 }
michael@0 229 }
michael@0 230
michael@0 231 /* Defines for instantaneous bw decisions */
michael@0 232 #define SCTP_INST_LOOSING 1 /* Loosing to other flows */
michael@0 233 #define SCTP_INST_NEUTRAL 2 /* Neutral, no indication */
michael@0 234 #define SCTP_INST_GAINING 3 /* Gaining, step down possible */
michael@0 235
michael@0 236
michael@0 237 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 238 static int
michael@0 239 cc_bw_same(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw,
michael@0 240 uint64_t rtt_offset, uint64_t vtag, uint8_t inst_ind)
michael@0 241 #else
michael@0 242 static int
michael@0 243 cc_bw_same(struct sctp_tcb *stcb SCTP_UNUSED, struct sctp_nets *net, uint64_t nbw,
michael@0 244 uint64_t rtt_offset, uint8_t inst_ind)
michael@0 245 #endif
michael@0 246 {
michael@0 247 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 248 uint64_t oth, probepoint;
michael@0 249 #endif
michael@0 250
michael@0 251 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 252 probepoint = (((uint64_t)net->cwnd) << 32);
michael@0 253 #endif
michael@0 254 if (net->rtt > net->cc_mod.rtcc.lbw_rtt + rtt_offset) {
michael@0 255 /*
michael@0 256 * rtt increased
michael@0 257 * we don't update bw.. so we don't
michael@0 258 * update the rtt either.
michael@0 259 */
michael@0 260 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 261 /* Probe point 5 */
michael@0 262 probepoint |= ((5 << 16) | 1);
michael@0 263 SDT_PROBE(sctp, cwnd, net, rttvar,
michael@0 264 vtag,
michael@0 265 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 266 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 267 net->flight_size,
michael@0 268 probepoint);
michael@0 269 #endif
michael@0 270 if ((net->cc_mod.rtcc.steady_step) && (inst_ind != SCTP_INST_LOOSING)) {
michael@0 271 if (net->cc_mod.rtcc.last_step_state == 5)
michael@0 272 net->cc_mod.rtcc.step_cnt++;
michael@0 273 else
michael@0 274 net->cc_mod.rtcc.step_cnt = 1;
michael@0 275 net->cc_mod.rtcc.last_step_state = 5;
michael@0 276 if ((net->cc_mod.rtcc.step_cnt == net->cc_mod.rtcc.steady_step) ||
michael@0 277 ((net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step) &&
michael@0 278 ((net->cc_mod.rtcc.step_cnt % net->cc_mod.rtcc.steady_step) == 0))) {
michael@0 279 /* Try a step down */
michael@0 280 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 281 oth = net->cc_mod.rtcc.vol_reduce;
michael@0 282 oth <<= 16;
michael@0 283 oth |= net->cc_mod.rtcc.step_cnt;
michael@0 284 oth <<= 16;
michael@0 285 oth |= net->cc_mod.rtcc.last_step_state;
michael@0 286 SDT_PROBE(sctp, cwnd, net, rttstep,
michael@0 287 vtag,
michael@0 288 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 289 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 290 oth,
michael@0 291 probepoint);
michael@0 292 #endif
michael@0 293 if (net->cwnd > (4 * net->mtu)) {
michael@0 294 net->cwnd -= net->mtu;
michael@0 295 net->cc_mod.rtcc.vol_reduce++;
michael@0 296 } else {
michael@0 297 net->cc_mod.rtcc.step_cnt = 0;
michael@0 298 }
michael@0 299 }
michael@0 300 }
michael@0 301 return (1);
michael@0 302 }
michael@0 303 if (net->rtt < net->cc_mod.rtcc.lbw_rtt-rtt_offset) {
michael@0 304 /*
michael@0 305 * rtt decreased, there could be more room.
michael@0 306 * we update both the bw and the rtt here to
michael@0 307 * lock this in as a good step down.
michael@0 308 */
michael@0 309 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 310 /* Probe point 6 */
michael@0 311 probepoint |= ((6 << 16) | 0);
michael@0 312 SDT_PROBE(sctp, cwnd, net, rttvar,
michael@0 313 vtag,
michael@0 314 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 315 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 316 net->flight_size,
michael@0 317 probepoint);
michael@0 318 #endif
michael@0 319 if (net->cc_mod.rtcc.steady_step) {
michael@0 320 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 321 oth = net->cc_mod.rtcc.vol_reduce;
michael@0 322 oth <<= 16;
michael@0 323 oth |= net->cc_mod.rtcc.step_cnt;
michael@0 324 oth <<= 16;
michael@0 325 oth |= net->cc_mod.rtcc.last_step_state;
michael@0 326 SDT_PROBE(sctp, cwnd, net, rttstep,
michael@0 327 vtag,
michael@0 328 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 329 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 330 oth,
michael@0 331 probepoint);
michael@0 332 #endif
michael@0 333 if ((net->cc_mod.rtcc.last_step_state == 5) &&
michael@0 334 (net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step)) {
michael@0 335 /* Step down worked */
michael@0 336 net->cc_mod.rtcc.step_cnt = 0;
michael@0 337 return (1);
michael@0 338 } else {
michael@0 339 net->cc_mod.rtcc.last_step_state = 6;
michael@0 340 net->cc_mod.rtcc.step_cnt = 0;
michael@0 341 }
michael@0 342 }
michael@0 343 net->cc_mod.rtcc.lbw = nbw;
michael@0 344 net->cc_mod.rtcc.lbw_rtt = net->rtt;
michael@0 345 net->cc_mod.rtcc.cwnd_at_bw_set = net->cwnd;
michael@0 346 if (inst_ind == SCTP_INST_GAINING)
michael@0 347 return (1);
michael@0 348 else if (inst_ind == SCTP_INST_NEUTRAL)
michael@0 349 return (1);
michael@0 350 else
michael@0 351 return (0);
michael@0 352 }
michael@0 353 /* Ok bw and rtt remained the same .. no update to any
michael@0 354 */
michael@0 355 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 356 /* Probe point 7 */
michael@0 357 probepoint |= ((7 << 16) | net->cc_mod.rtcc.ret_from_eq);
michael@0 358 SDT_PROBE(sctp, cwnd, net, rttvar,
michael@0 359 vtag,
michael@0 360 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 361 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 362 net->flight_size,
michael@0 363 probepoint);
michael@0 364 #endif
michael@0 365 if ((net->cc_mod.rtcc.steady_step) && (inst_ind != SCTP_INST_LOOSING)) {
michael@0 366 if (net->cc_mod.rtcc.last_step_state == 5)
michael@0 367 net->cc_mod.rtcc.step_cnt++;
michael@0 368 else
michael@0 369 net->cc_mod.rtcc.step_cnt = 1;
michael@0 370 net->cc_mod.rtcc.last_step_state = 5;
michael@0 371 if ((net->cc_mod.rtcc.step_cnt == net->cc_mod.rtcc.steady_step) ||
michael@0 372 ((net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step) &&
michael@0 373 ((net->cc_mod.rtcc.step_cnt % net->cc_mod.rtcc.steady_step) == 0))) {
michael@0 374 /* Try a step down */
michael@0 375 if (net->cwnd > (4 * net->mtu)) {
michael@0 376 net->cwnd -= net->mtu;
michael@0 377 net->cc_mod.rtcc.vol_reduce++;
michael@0 378 return (1);
michael@0 379 } else {
michael@0 380 net->cc_mod.rtcc.step_cnt = 0;
michael@0 381 }
michael@0 382 }
michael@0 383 }
michael@0 384 if (inst_ind == SCTP_INST_GAINING)
michael@0 385 return (1);
michael@0 386 else if (inst_ind == SCTP_INST_NEUTRAL)
michael@0 387 return (1);
michael@0 388 else
michael@0 389 return ((int)net->cc_mod.rtcc.ret_from_eq);
michael@0 390 }
michael@0 391
michael@0 392 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 393 static int
michael@0 394 cc_bw_decrease(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw, uint64_t rtt_offset,
michael@0 395 uint64_t vtag, uint8_t inst_ind)
michael@0 396 #else
michael@0 397 static int
michael@0 398 cc_bw_decrease(struct sctp_tcb *stcb SCTP_UNUSED, struct sctp_nets *net, uint64_t nbw, uint64_t rtt_offset,
michael@0 399 uint8_t inst_ind)
michael@0 400 #endif
michael@0 401 {
michael@0 402 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 403 uint64_t oth, probepoint;
michael@0 404 #endif
michael@0 405
michael@0 406 /* Bandwidth decreased.*/
michael@0 407 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 408 probepoint = (((uint64_t)net->cwnd) << 32);
michael@0 409 #endif
michael@0 410 if (net->rtt > net->cc_mod.rtcc.lbw_rtt+rtt_offset) {
michael@0 411 /* rtt increased */
michael@0 412 /* Did we add more */
michael@0 413 if ((net->cwnd > net->cc_mod.rtcc.cwnd_at_bw_set) &&
michael@0 414 (inst_ind != SCTP_INST_LOOSING)) {
michael@0 415 /* We caused it maybe.. back off? */
michael@0 416 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 417 /* PROBE POINT 1 */
michael@0 418 probepoint |= ((1 << 16) | 1);
michael@0 419 SDT_PROBE(sctp, cwnd, net, rttvar,
michael@0 420 vtag,
michael@0 421 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 422 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 423 net->flight_size,
michael@0 424 probepoint);
michael@0 425 #endif
michael@0 426 if (net->cc_mod.rtcc.ret_from_eq) {
michael@0 427 /* Switch over to CA if we are less aggressive */
michael@0 428 net->ssthresh = net->cwnd-1;
michael@0 429 net->partial_bytes_acked = 0;
michael@0 430 }
michael@0 431 return (1);
michael@0 432 }
michael@0 433 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 434 /* Probe point 2 */
michael@0 435 probepoint |= ((2 << 16) | 0);
michael@0 436 SDT_PROBE(sctp, cwnd, net, rttvar,
michael@0 437 vtag,
michael@0 438 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 439 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 440 net->flight_size,
michael@0 441 probepoint);
michael@0 442 #endif
michael@0 443 /* Someone else - fight for more? */
michael@0 444 if (net->cc_mod.rtcc.steady_step) {
michael@0 445 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 446 oth = net->cc_mod.rtcc.vol_reduce;
michael@0 447 oth <<= 16;
michael@0 448 oth |= net->cc_mod.rtcc.step_cnt;
michael@0 449 oth <<= 16;
michael@0 450 oth |= net->cc_mod.rtcc.last_step_state;
michael@0 451 SDT_PROBE(sctp, cwnd, net, rttstep,
michael@0 452 vtag,
michael@0 453 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 454 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 455 oth,
michael@0 456 probepoint);
michael@0 457 #endif
michael@0 458 /* Did we voluntarily give up some? if so take
michael@0 459 * one back please
michael@0 460 */
michael@0 461 if ((net->cc_mod.rtcc.vol_reduce) &&
michael@0 462 (inst_ind != SCTP_INST_GAINING)) {
michael@0 463 net->cwnd += net->mtu;
michael@0 464 net->cc_mod.rtcc.vol_reduce--;
michael@0 465 }
michael@0 466 net->cc_mod.rtcc.last_step_state = 2;
michael@0 467 net->cc_mod.rtcc.step_cnt = 0;
michael@0 468 }
michael@0 469 goto out_decision;
michael@0 470 } else if (net->rtt < net->cc_mod.rtcc.lbw_rtt-rtt_offset) {
michael@0 471 /* bw & rtt decreased */
michael@0 472 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 473 /* Probe point 3 */
michael@0 474 probepoint |= ((3 << 16) | 0);
michael@0 475 SDT_PROBE(sctp, cwnd, net, rttvar,
michael@0 476 vtag,
michael@0 477 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 478 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 479 net->flight_size,
michael@0 480 probepoint);
michael@0 481 #endif
michael@0 482 if (net->cc_mod.rtcc.steady_step) {
michael@0 483 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 484 oth = net->cc_mod.rtcc.vol_reduce;
michael@0 485 oth <<= 16;
michael@0 486 oth |= net->cc_mod.rtcc.step_cnt;
michael@0 487 oth <<= 16;
michael@0 488 oth |= net->cc_mod.rtcc.last_step_state;
michael@0 489 SDT_PROBE(sctp, cwnd, net, rttstep,
michael@0 490 vtag,
michael@0 491 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 492 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 493 oth,
michael@0 494 probepoint);
michael@0 495 #endif
michael@0 496 if ((net->cc_mod.rtcc.vol_reduce) &&
michael@0 497 (inst_ind != SCTP_INST_GAINING)) {
michael@0 498 net->cwnd += net->mtu;
michael@0 499 net->cc_mod.rtcc.vol_reduce--;
michael@0 500 }
michael@0 501 net->cc_mod.rtcc.last_step_state = 3;
michael@0 502 net->cc_mod.rtcc.step_cnt = 0;
michael@0 503 }
michael@0 504 goto out_decision;
michael@0 505 }
michael@0 506 /* The bw decreased but rtt stayed the same */
michael@0 507 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 508 /* Probe point 4 */
michael@0 509 probepoint |= ((4 << 16) | 0);
michael@0 510 SDT_PROBE(sctp, cwnd, net, rttvar,
michael@0 511 vtag,
michael@0 512 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 513 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 514 net->flight_size,
michael@0 515 probepoint);
michael@0 516 #endif
michael@0 517 if (net->cc_mod.rtcc.steady_step) {
michael@0 518 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 519 oth = net->cc_mod.rtcc.vol_reduce;
michael@0 520 oth <<= 16;
michael@0 521 oth |= net->cc_mod.rtcc.step_cnt;
michael@0 522 oth <<= 16;
michael@0 523 oth |= net->cc_mod.rtcc.last_step_state;
michael@0 524 SDT_PROBE(sctp, cwnd, net, rttstep,
michael@0 525 vtag,
michael@0 526 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 527 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 528 oth,
michael@0 529 probepoint);
michael@0 530 #endif
michael@0 531 if ((net->cc_mod.rtcc.vol_reduce) &&
michael@0 532 (inst_ind != SCTP_INST_GAINING)) {
michael@0 533 net->cwnd += net->mtu;
michael@0 534 net->cc_mod.rtcc.vol_reduce--;
michael@0 535 }
michael@0 536 net->cc_mod.rtcc.last_step_state = 4;
michael@0 537 net->cc_mod.rtcc.step_cnt = 0;
michael@0 538 }
michael@0 539 out_decision:
michael@0 540 net->cc_mod.rtcc.lbw = nbw;
michael@0 541 net->cc_mod.rtcc.lbw_rtt = net->rtt;
michael@0 542 net->cc_mod.rtcc.cwnd_at_bw_set = net->cwnd;
michael@0 543 if (inst_ind == SCTP_INST_GAINING) {
michael@0 544 return (1);
michael@0 545 } else {
michael@0 546 return (0);
michael@0 547 }
michael@0 548 }
michael@0 549
michael@0 550 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 551 static int
michael@0 552 cc_bw_increase(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw, uint64_t vtag)
michael@0 553 #else
michael@0 554 static int
michael@0 555 cc_bw_increase(struct sctp_tcb *stcb SCTP_UNUSED, struct sctp_nets *net, uint64_t nbw)
michael@0 556 #endif
michael@0 557 {
michael@0 558 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 559 uint64_t oth, probepoint;
michael@0 560
michael@0 561 #endif
michael@0 562 /* BW increased, so update and
michael@0 563 * return 0, since all actions in
michael@0 564 * our table say to do the normal CC
michael@0 565 * update. Note that we pay no attention to
michael@0 566 * the inst_ind since our overall sum is increasing.
michael@0 567 */
michael@0 568 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 569 /* PROBE POINT 0 */
michael@0 570 probepoint = (((uint64_t)net->cwnd) << 32);
michael@0 571 SDT_PROBE(sctp, cwnd, net, rttvar,
michael@0 572 vtag,
michael@0 573 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 574 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 575 net->flight_size,
michael@0 576 probepoint);
michael@0 577 #endif
michael@0 578 if (net->cc_mod.rtcc.steady_step) {
michael@0 579 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 580 oth = net->cc_mod.rtcc.vol_reduce;
michael@0 581 oth <<= 16;
michael@0 582 oth |= net->cc_mod.rtcc.step_cnt;
michael@0 583 oth <<= 16;
michael@0 584 oth |= net->cc_mod.rtcc.last_step_state;
michael@0 585 SDT_PROBE(sctp, cwnd, net, rttstep,
michael@0 586 vtag,
michael@0 587 ((net->cc_mod.rtcc.lbw << 32) | nbw),
michael@0 588 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 589 oth,
michael@0 590 probepoint);
michael@0 591 #endif
michael@0 592 net->cc_mod.rtcc.last_step_state = 0;
michael@0 593 net->cc_mod.rtcc.step_cnt = 0;
michael@0 594 net->cc_mod.rtcc.vol_reduce = 0;
michael@0 595 }
michael@0 596 net->cc_mod.rtcc.lbw = nbw;
michael@0 597 net->cc_mod.rtcc.lbw_rtt = net->rtt;
michael@0 598 net->cc_mod.rtcc.cwnd_at_bw_set = net->cwnd;
michael@0 599 return (0);
michael@0 600 }
michael@0 601
michael@0 602 /* RTCC Algoritm to limit growth of cwnd, return
michael@0 603 * true if you want to NOT allow cwnd growth
michael@0 604 */
michael@0 605 static int
michael@0 606 cc_bw_limit(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw)
michael@0 607 {
michael@0 608 uint64_t bw_offset, rtt_offset;
michael@0 609 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 610 uint64_t probepoint, rtt, vtag;
michael@0 611 #endif
michael@0 612 uint64_t bytes_for_this_rtt, inst_bw;
michael@0 613 uint64_t div, inst_off;
michael@0 614 int bw_shift;
michael@0 615 uint8_t inst_ind;
michael@0 616 int ret;
michael@0 617 /*-
michael@0 618 * Here we need to see if we want
michael@0 619 * to limit cwnd growth due to increase
michael@0 620 * in overall rtt but no increase in bw.
michael@0 621 * We use the following table to figure
michael@0 622 * out what we should do. When we return
michael@0 623 * 0, cc update goes on as planned. If we
michael@0 624 * return 1, then no cc update happens and cwnd
michael@0 625 * stays where it is at.
michael@0 626 * ----------------------------------
michael@0 627 * BW | RTT | Action
michael@0 628 * *********************************
michael@0 629 * INC | INC | return 0
michael@0 630 * ----------------------------------
michael@0 631 * INC | SAME | return 0
michael@0 632 * ----------------------------------
michael@0 633 * INC | DECR | return 0
michael@0 634 * ----------------------------------
michael@0 635 * SAME | INC | return 1
michael@0 636 * ----------------------------------
michael@0 637 * SAME | SAME | return 1
michael@0 638 * ----------------------------------
michael@0 639 * SAME | DECR | return 0
michael@0 640 * ----------------------------------
michael@0 641 * DECR | INC | return 0 or 1 based on if we caused.
michael@0 642 * ----------------------------------
michael@0 643 * DECR | SAME | return 0
michael@0 644 * ----------------------------------
michael@0 645 * DECR | DECR | return 0
michael@0 646 * ----------------------------------
michael@0 647 *
michael@0 648 * We are a bit fuzz on what an increase or
michael@0 649 * decrease is. For BW it is the same if
michael@0 650 * it did not change within 1/64th. For
michael@0 651 * RTT it stayed the same if it did not
michael@0 652 * change within 1/32nd
michael@0 653 */
michael@0 654 bw_shift = SCTP_BASE_SYSCTL(sctp_rttvar_bw);
michael@0 655 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 656 rtt = stcb->asoc.my_vtag;
michael@0 657 vtag = (rtt << 32) | (((uint32_t)(stcb->sctp_ep->sctp_lport)) << 16) | (stcb->rport);
michael@0 658 probepoint = (((uint64_t)net->cwnd) << 32);
michael@0 659 rtt = net->rtt;
michael@0 660 #endif
michael@0 661 if (net->cc_mod.rtcc.rtt_set_this_sack) {
michael@0 662 net->cc_mod.rtcc.rtt_set_this_sack = 0;
michael@0 663 bytes_for_this_rtt = net->cc_mod.rtcc.bw_bytes - net->cc_mod.rtcc.bw_bytes_at_last_rttc;
michael@0 664 net->cc_mod.rtcc.bw_bytes_at_last_rttc = net->cc_mod.rtcc.bw_bytes;
michael@0 665 if (net->rtt) {
michael@0 666 div = net->rtt / 1000;
michael@0 667 if (div) {
michael@0 668 inst_bw = bytes_for_this_rtt / div;
michael@0 669 inst_off = inst_bw >> bw_shift;
michael@0 670 if (inst_bw > nbw)
michael@0 671 inst_ind = SCTP_INST_GAINING;
michael@0 672 else if ((inst_bw+inst_off) < nbw)
michael@0 673 inst_ind = SCTP_INST_LOOSING;
michael@0 674 else
michael@0 675 inst_ind = SCTP_INST_NEUTRAL;
michael@0 676 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 677 probepoint |= ((0xb << 16) | inst_ind);
michael@0 678 #endif
michael@0 679 } else {
michael@0 680 inst_ind = net->cc_mod.rtcc.last_inst_ind;
michael@0 681 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 682 inst_bw = bytes_for_this_rtt / (uint64_t)(net->rtt);
michael@0 683 /* Can't determine do not change */
michael@0 684 probepoint |= ((0xc << 16) | inst_ind);
michael@0 685 #endif
michael@0 686 }
michael@0 687 } else {
michael@0 688 inst_ind = net->cc_mod.rtcc.last_inst_ind;
michael@0 689 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 690 inst_bw = bytes_for_this_rtt;
michael@0 691 /* Can't determine do not change */
michael@0 692 probepoint |= ((0xd << 16) | inst_ind);
michael@0 693 #endif
michael@0 694 }
michael@0 695 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 696 SDT_PROBE(sctp, cwnd, net, rttvar,
michael@0 697 vtag,
michael@0 698 ((nbw << 32) | inst_bw),
michael@0 699 ((net->cc_mod.rtcc.lbw_rtt << 32) | rtt),
michael@0 700 net->flight_size,
michael@0 701 probepoint);
michael@0 702 #endif
michael@0 703 } else {
michael@0 704 /* No rtt measurement, use last one */
michael@0 705 inst_ind = net->cc_mod.rtcc.last_inst_ind;
michael@0 706 }
michael@0 707 bw_offset = net->cc_mod.rtcc.lbw >> bw_shift;
michael@0 708 if (nbw > net->cc_mod.rtcc.lbw + bw_offset) {
michael@0 709 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 710 ret = cc_bw_increase(stcb, net, nbw, vtag);
michael@0 711 #else
michael@0 712 ret = cc_bw_increase(stcb, net, nbw);
michael@0 713 #endif
michael@0 714 goto out;
michael@0 715 }
michael@0 716 rtt_offset = net->cc_mod.rtcc.lbw_rtt >> SCTP_BASE_SYSCTL(sctp_rttvar_rtt);
michael@0 717 if (nbw < net->cc_mod.rtcc.lbw - bw_offset) {
michael@0 718 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 719 ret = cc_bw_decrease(stcb, net, nbw, rtt_offset, vtag, inst_ind);
michael@0 720 #else
michael@0 721 ret = cc_bw_decrease(stcb, net, nbw, rtt_offset, inst_ind);
michael@0 722 #endif
michael@0 723 goto out;
michael@0 724 }
michael@0 725 /* If we reach here then
michael@0 726 * we are in a situation where
michael@0 727 * the bw stayed the same.
michael@0 728 */
michael@0 729 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 730 ret = cc_bw_same(stcb, net, nbw, rtt_offset, vtag, inst_ind);
michael@0 731 #else
michael@0 732 ret = cc_bw_same(stcb, net, nbw, rtt_offset, inst_ind);
michael@0 733 #endif
michael@0 734 out:
michael@0 735 net->cc_mod.rtcc.last_inst_ind = inst_ind;
michael@0 736 return (ret);
michael@0 737 }
michael@0 738
michael@0 739 static void
michael@0 740 sctp_cwnd_update_after_sack_common(struct sctp_tcb *stcb,
michael@0 741 struct sctp_association *asoc,
michael@0 742 int accum_moved, int reneged_all SCTP_UNUSED, int will_exit, int use_rtcc)
michael@0 743 {
michael@0 744 struct sctp_nets *net;
michael@0 745 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 746 int old_cwnd;
michael@0 747 #endif
michael@0 748 uint32_t t_ssthresh, t_cwnd, incr;
michael@0 749 uint64_t t_ucwnd_sbw;
michael@0 750 uint64_t t_path_mptcp;
michael@0 751 uint64_t mptcp_like_alpha;
michael@0 752 uint32_t srtt;
michael@0 753 uint64_t max_path;
michael@0 754
michael@0 755 /* MT FIXME: Don't compute this over and over again */
michael@0 756 t_ssthresh = 0;
michael@0 757 t_cwnd = 0;
michael@0 758 t_ucwnd_sbw = 0;
michael@0 759 t_path_mptcp = 0;
michael@0 760 mptcp_like_alpha = 1;
michael@0 761 if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) ||
michael@0 762 (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2) ||
michael@0 763 (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_MPTCP)) {
michael@0 764 max_path = 0;
michael@0 765 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
michael@0 766 t_ssthresh += net->ssthresh;
michael@0 767 t_cwnd += net->cwnd;
michael@0 768 /* lastsa>>3; we don't need to devide ...*/
michael@0 769 srtt = net->lastsa;
michael@0 770 if (srtt > 0) {
michael@0 771 uint64_t tmp;
michael@0 772
michael@0 773 t_ucwnd_sbw += (uint64_t)net->cwnd / (uint64_t)srtt;
michael@0 774 t_path_mptcp += (((uint64_t)net->cwnd) << SHIFT_MPTCP_MULTI_Z) /
michael@0 775 (((uint64_t)net->mtu) * (uint64_t)srtt);
michael@0 776 tmp = (((uint64_t)net->cwnd) << SHIFT_MPTCP_MULTI_N) /
michael@0 777 ((uint64_t)net->mtu * (uint64_t)(srtt * srtt));
michael@0 778 if (tmp > max_path) {
michael@0 779 max_path = tmp;
michael@0 780 }
michael@0 781 }
michael@0 782 }
michael@0 783 if (t_path_mptcp > 0) {
michael@0 784 mptcp_like_alpha = max_path / (t_path_mptcp * t_path_mptcp);
michael@0 785 } else {
michael@0 786 mptcp_like_alpha = 1;
michael@0 787 }
michael@0 788 }
michael@0 789 if (t_ssthresh == 0) {
michael@0 790 t_ssthresh = 1;
michael@0 791 }
michael@0 792 if (t_ucwnd_sbw == 0) {
michael@0 793 t_ucwnd_sbw = 1;
michael@0 794 }
michael@0 795 /******************************/
michael@0 796 /* update cwnd and Early FR */
michael@0 797 /******************************/
michael@0 798 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
michael@0 799
michael@0 800 #ifdef JANA_CMT_FAST_RECOVERY
michael@0 801 /*
michael@0 802 * CMT fast recovery code. Need to debug.
michael@0 803 */
michael@0 804 if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) {
michael@0 805 if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) ||
michael@0 806 SCTP_TSN_GE(net->pseudo_cumack,net->fast_recovery_tsn)) {
michael@0 807 net->will_exit_fast_recovery = 1;
michael@0 808 }
michael@0 809 }
michael@0 810 #endif
michael@0 811 /* if nothing was acked on this destination skip it */
michael@0 812 if (net->net_ack == 0) {
michael@0 813 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
michael@0 814 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK);
michael@0 815 }
michael@0 816 continue;
michael@0 817 }
michael@0 818 #ifdef JANA_CMT_FAST_RECOVERY
michael@0 819 /* CMT fast recovery code
michael@0 820 */
michael@0 821 /*
michael@0 822 if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery && net->will_exit_fast_recovery == 0) {
michael@0 823 @@@ Do something
michael@0 824 }
michael@0 825 else if (sctp_cmt_on_off == 0 && asoc->fast_retran_loss_recovery && will_exit == 0) {
michael@0 826 */
michael@0 827 #endif
michael@0 828
michael@0 829 if (asoc->fast_retran_loss_recovery &&
michael@0 830 (will_exit == 0) &&
michael@0 831 (asoc->sctp_cmt_on_off == 0)) {
michael@0 832 /*
michael@0 833 * If we are in loss recovery we skip any cwnd
michael@0 834 * update
michael@0 835 */
michael@0 836 return;
michael@0 837 }
michael@0 838 /*
michael@0 839 * Did any measurements go on for this network?
michael@0 840 */
michael@0 841 if (use_rtcc && (net->cc_mod.rtcc.tls_needs_set > 0)) {
michael@0 842 uint64_t nbw;
michael@0 843 /*
michael@0 844 * At this point our bw_bytes has been updated
michael@0 845 * by incoming sack information.
michael@0 846 *
michael@0 847 * But our bw may not yet be set.
michael@0 848 *
michael@0 849 */
michael@0 850 if ((net->cc_mod.rtcc.new_tot_time/1000) > 0) {
michael@0 851 nbw = net->cc_mod.rtcc.bw_bytes/(net->cc_mod.rtcc.new_tot_time/1000);
michael@0 852 } else {
michael@0 853 nbw = net->cc_mod.rtcc.bw_bytes;
michael@0 854 }
michael@0 855 if (net->cc_mod.rtcc.lbw) {
michael@0 856 if (cc_bw_limit(stcb, net, nbw)) {
michael@0 857 /* Hold here, no update */
michael@0 858 continue;
michael@0 859 }
michael@0 860 } else {
michael@0 861 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 862 uint64_t vtag, probepoint;
michael@0 863
michael@0 864 probepoint = (((uint64_t)net->cwnd) << 32);
michael@0 865 probepoint |= ((0xa << 16) | 0);
michael@0 866 vtag = (net->rtt << 32) |
michael@0 867 (((uint32_t)(stcb->sctp_ep->sctp_lport)) << 16) |
michael@0 868 (stcb->rport);
michael@0 869
michael@0 870 SDT_PROBE(sctp, cwnd, net, rttvar,
michael@0 871 vtag,
michael@0 872 nbw,
michael@0 873 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 874 net->flight_size,
michael@0 875 probepoint);
michael@0 876 #endif
michael@0 877 net->cc_mod.rtcc.lbw = nbw;
michael@0 878 net->cc_mod.rtcc.lbw_rtt = net->rtt;
michael@0 879 if (net->cc_mod.rtcc.rtt_set_this_sack) {
michael@0 880 net->cc_mod.rtcc.rtt_set_this_sack = 0;
michael@0 881 net->cc_mod.rtcc.bw_bytes_at_last_rttc = net->cc_mod.rtcc.bw_bytes;
michael@0 882 }
michael@0 883 }
michael@0 884 }
michael@0 885 /*
michael@0 886 * CMT: CUC algorithm. Update cwnd if pseudo-cumack has
michael@0 887 * moved.
michael@0 888 */
michael@0 889 if (accum_moved ||
michael@0 890 ((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) {
michael@0 891 /* If the cumulative ack moved we can proceed */
michael@0 892 if (net->cwnd <= net->ssthresh) {
michael@0 893 /* We are in slow start */
michael@0 894 if (net->flight_size + net->net_ack >= net->cwnd) {
michael@0 895 uint32_t limit;
michael@0 896
michael@0 897 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 898 old_cwnd = net->cwnd;
michael@0 899 #endif
michael@0 900 switch (asoc->sctp_cmt_on_off) {
michael@0 901 case SCTP_CMT_RPV1:
michael@0 902 limit = (uint32_t)(((uint64_t)net->mtu *
michael@0 903 (uint64_t)SCTP_BASE_SYSCTL(sctp_L2_abc_variable) *
michael@0 904 (uint64_t)net->ssthresh) /
michael@0 905 (uint64_t)t_ssthresh);
michael@0 906 incr = (uint32_t)(((uint64_t)net->net_ack *
michael@0 907 (uint64_t)net->ssthresh) /
michael@0 908 (uint64_t)t_ssthresh);
michael@0 909 if (incr > limit) {
michael@0 910 incr = limit;
michael@0 911 }
michael@0 912 if (incr == 0) {
michael@0 913 incr = 1;
michael@0 914 }
michael@0 915 break;
michael@0 916 case SCTP_CMT_RPV2:
michael@0 917 /* lastsa>>3; we don't need to divide ...*/
michael@0 918 srtt = net->lastsa;
michael@0 919 if (srtt == 0) {
michael@0 920 srtt = 1;
michael@0 921 }
michael@0 922 limit = (uint32_t)(((uint64_t)net->mtu *
michael@0 923 (uint64_t)SCTP_BASE_SYSCTL(sctp_L2_abc_variable) *
michael@0 924 (uint64_t)net->cwnd) /
michael@0 925 ((uint64_t)srtt * t_ucwnd_sbw));
michael@0 926 /* INCREASE FACTOR */
michael@0 927 incr = (uint32_t)(((uint64_t)net->net_ack *
michael@0 928 (uint64_t)net->cwnd) /
michael@0 929 ((uint64_t)srtt * t_ucwnd_sbw));
michael@0 930 /* INCREASE FACTOR */
michael@0 931 if (incr > limit) {
michael@0 932 incr = limit;
michael@0 933 }
michael@0 934 if (incr == 0) {
michael@0 935 incr = 1;
michael@0 936 }
michael@0 937 break;
michael@0 938 case SCTP_CMT_MPTCP:
michael@0 939 limit = (uint32_t)(((uint64_t)net->mtu *
michael@0 940 mptcp_like_alpha *
michael@0 941 (uint64_t)SCTP_BASE_SYSCTL(sctp_L2_abc_variable)) >>
michael@0 942 SHIFT_MPTCP_MULTI);
michael@0 943 incr = (uint32_t)(((uint64_t)net->net_ack *
michael@0 944 mptcp_like_alpha) >>
michael@0 945 SHIFT_MPTCP_MULTI);
michael@0 946 if (incr > limit) {
michael@0 947 incr = limit;
michael@0 948 }
michael@0 949 if (incr > net->net_ack) {
michael@0 950 incr = net->net_ack;
michael@0 951 }
michael@0 952 if (incr > net->mtu) {
michael@0 953 incr = net->mtu;
michael@0 954 }
michael@0 955 break;
michael@0 956 default:
michael@0 957 incr = net->net_ack;
michael@0 958 if (incr > net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable)) {
michael@0 959 incr = net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable);
michael@0 960 }
michael@0 961 break;
michael@0 962 }
michael@0 963 net->cwnd += incr;
michael@0 964 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 965 sctp_log_cwnd(stcb, net, incr,
michael@0 966 SCTP_CWND_LOG_FROM_SS);
michael@0 967 }
michael@0 968 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 969 SDT_PROBE(sctp, cwnd, net, ack,
michael@0 970 stcb->asoc.my_vtag,
michael@0 971 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
michael@0 972 net,
michael@0 973 old_cwnd, net->cwnd);
michael@0 974 #endif
michael@0 975 } else {
michael@0 976 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
michael@0 977 sctp_log_cwnd(stcb, net, net->net_ack,
michael@0 978 SCTP_CWND_LOG_NOADV_SS);
michael@0 979 }
michael@0 980 }
michael@0 981 } else {
michael@0 982 /* We are in congestion avoidance */
michael@0 983 /*
michael@0 984 * Add to pba
michael@0 985 */
michael@0 986 net->partial_bytes_acked += net->net_ack;
michael@0 987
michael@0 988 if ((net->flight_size + net->net_ack >= net->cwnd) &&
michael@0 989 (net->partial_bytes_acked >= net->cwnd)) {
michael@0 990 net->partial_bytes_acked -= net->cwnd;
michael@0 991 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 992 old_cwnd = net->cwnd;
michael@0 993 #endif
michael@0 994 switch (asoc->sctp_cmt_on_off) {
michael@0 995 case SCTP_CMT_RPV1:
michael@0 996 incr = (uint32_t)(((uint64_t)net->mtu *
michael@0 997 (uint64_t)net->ssthresh) /
michael@0 998 (uint64_t)t_ssthresh);
michael@0 999 if (incr == 0) {
michael@0 1000 incr = 1;
michael@0 1001 }
michael@0 1002 break;
michael@0 1003 case SCTP_CMT_RPV2:
michael@0 1004 /* lastsa>>3; we don't need to divide ... */
michael@0 1005 srtt = net->lastsa;
michael@0 1006 if (srtt == 0) {
michael@0 1007 srtt = 1;
michael@0 1008 }
michael@0 1009 incr = (uint32_t)((uint64_t)net->mtu *
michael@0 1010 (uint64_t)net->cwnd /
michael@0 1011 ((uint64_t)srtt *
michael@0 1012 t_ucwnd_sbw));
michael@0 1013 /* INCREASE FACTOR */
michael@0 1014 if (incr == 0) {
michael@0 1015 incr = 1;
michael@0 1016 }
michael@0 1017 break;
michael@0 1018 case SCTP_CMT_MPTCP:
michael@0 1019 incr = (uint32_t)((mptcp_like_alpha *
michael@0 1020 (uint64_t) net->cwnd) >>
michael@0 1021 SHIFT_MPTCP_MULTI);
michael@0 1022 if (incr > net->mtu) {
michael@0 1023 incr = net->mtu;
michael@0 1024 }
michael@0 1025 break;
michael@0 1026 default:
michael@0 1027 incr = net->mtu;
michael@0 1028 break;
michael@0 1029 }
michael@0 1030 net->cwnd += incr;
michael@0 1031 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 1032 SDT_PROBE(sctp, cwnd, net, ack,
michael@0 1033 stcb->asoc.my_vtag,
michael@0 1034 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
michael@0 1035 net,
michael@0 1036 old_cwnd, net->cwnd);
michael@0 1037 #endif
michael@0 1038 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 1039 sctp_log_cwnd(stcb, net, net->mtu,
michael@0 1040 SCTP_CWND_LOG_FROM_CA);
michael@0 1041 }
michael@0 1042 } else {
michael@0 1043 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
michael@0 1044 sctp_log_cwnd(stcb, net, net->net_ack,
michael@0 1045 SCTP_CWND_LOG_NOADV_CA);
michael@0 1046 }
michael@0 1047 }
michael@0 1048 }
michael@0 1049 } else {
michael@0 1050 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
michael@0 1051 sctp_log_cwnd(stcb, net, net->mtu,
michael@0 1052 SCTP_CWND_LOG_NO_CUMACK);
michael@0 1053 }
michael@0 1054 }
michael@0 1055 }
michael@0 1056 }
michael@0 1057
michael@0 1058 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 1059 static void
michael@0 1060 sctp_cwnd_update_exit_pf_common(struct sctp_tcb *stcb, struct sctp_nets *net)
michael@0 1061 #else
michael@0 1062 static void
michael@0 1063 sctp_cwnd_update_exit_pf_common(struct sctp_tcb *stcb SCTP_UNUSED, struct sctp_nets *net)
michael@0 1064 #endif
michael@0 1065 {
michael@0 1066 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 1067 int old_cwnd;
michael@0 1068
michael@0 1069 old_cwnd = net->cwnd;
michael@0 1070 #endif
michael@0 1071 net->cwnd = net->mtu;
michael@0 1072 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 1073 SDT_PROBE(sctp, cwnd, net, ack,
michael@0 1074 stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net,
michael@0 1075 old_cwnd, net->cwnd);
michael@0 1076 #endif
michael@0 1077 SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n",
michael@0 1078 (void *)net, net->cwnd);
michael@0 1079 }
michael@0 1080
michael@0 1081
michael@0 1082 static void
michael@0 1083 sctp_cwnd_update_after_timeout(struct sctp_tcb *stcb, struct sctp_nets *net)
michael@0 1084 {
michael@0 1085 int old_cwnd = net->cwnd;
michael@0 1086 uint32_t t_ssthresh, t_cwnd;
michael@0 1087 uint64_t t_ucwnd_sbw;
michael@0 1088
michael@0 1089 /* MT FIXME: Don't compute this over and over again */
michael@0 1090 t_ssthresh = 0;
michael@0 1091 t_cwnd = 0;
michael@0 1092 if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) ||
michael@0 1093 (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2)) {
michael@0 1094 struct sctp_nets *lnet;
michael@0 1095 uint32_t srtt;
michael@0 1096
michael@0 1097 t_ucwnd_sbw = 0;
michael@0 1098 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
michael@0 1099 t_ssthresh += lnet->ssthresh;
michael@0 1100 t_cwnd += lnet->cwnd;
michael@0 1101 srtt = lnet->lastsa;
michael@0 1102 /* lastsa>>3; we don't need to divide ... */
michael@0 1103 if (srtt > 0) {
michael@0 1104 t_ucwnd_sbw += (uint64_t)lnet->cwnd / (uint64_t)srtt;
michael@0 1105 }
michael@0 1106 }
michael@0 1107 if (t_ssthresh < 1) {
michael@0 1108 t_ssthresh = 1;
michael@0 1109 }
michael@0 1110 if (t_ucwnd_sbw < 1) {
michael@0 1111 t_ucwnd_sbw = 1;
michael@0 1112 }
michael@0 1113 if (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) {
michael@0 1114 net->ssthresh = (uint32_t)(((uint64_t)4 *
michael@0 1115 (uint64_t)net->mtu *
michael@0 1116 (uint64_t)net->ssthresh) /
michael@0 1117 (uint64_t)t_ssthresh);
michael@0 1118 } else {
michael@0 1119 uint64_t cc_delta;
michael@0 1120
michael@0 1121 srtt = net->lastsa;
michael@0 1122 /* lastsa>>3; we don't need to divide ... */
michael@0 1123 if (srtt == 0) {
michael@0 1124 srtt = 1;
michael@0 1125 }
michael@0 1126 cc_delta = t_ucwnd_sbw * (uint64_t)srtt / 2;
michael@0 1127 if (cc_delta < t_cwnd) {
michael@0 1128 net->ssthresh = (uint32_t)((uint64_t)t_cwnd - cc_delta);
michael@0 1129 } else {
michael@0 1130 net->ssthresh = net->mtu;
michael@0 1131 }
michael@0 1132 }
michael@0 1133 if ((net->cwnd > t_cwnd / 2) &&
michael@0 1134 (net->ssthresh < net->cwnd - t_cwnd / 2)) {
michael@0 1135 net->ssthresh = net->cwnd - t_cwnd / 2;
michael@0 1136 }
michael@0 1137 if (net->ssthresh < net->mtu) {
michael@0 1138 net->ssthresh = net->mtu;
michael@0 1139 }
michael@0 1140 } else {
michael@0 1141 net->ssthresh = max(net->cwnd / 2, 4 * net->mtu);
michael@0 1142 }
michael@0 1143 net->cwnd = net->mtu;
michael@0 1144 net->partial_bytes_acked = 0;
michael@0 1145 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 1146 SDT_PROBE(sctp, cwnd, net, to,
michael@0 1147 stcb->asoc.my_vtag,
michael@0 1148 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
michael@0 1149 net,
michael@0 1150 old_cwnd, net->cwnd);
michael@0 1151 #endif
michael@0 1152 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 1153 sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX);
michael@0 1154 }
michael@0 1155 }
michael@0 1156
michael@0 1157 static void
michael@0 1158 sctp_cwnd_update_after_ecn_echo_common(struct sctp_tcb *stcb, struct sctp_nets *net,
michael@0 1159 int in_window, int num_pkt_lost, int use_rtcc)
michael@0 1160 {
michael@0 1161 int old_cwnd = net->cwnd;
michael@0 1162 if ((use_rtcc) && (net->lan_type == SCTP_LAN_LOCAL) && (net->cc_mod.rtcc.use_dccc_ecn)) {
michael@0 1163 /* Data center Congestion Control */
michael@0 1164 if (in_window == 0) {
michael@0 1165 /* Go to CA with the cwnd at the point we sent
michael@0 1166 * the TSN that was marked with a CE.
michael@0 1167 */
michael@0 1168 if (net->ecn_prev_cwnd < net->cwnd) {
michael@0 1169 /* Restore to prev cwnd */
michael@0 1170 net->cwnd = net->ecn_prev_cwnd - (net->mtu * num_pkt_lost);
michael@0 1171 } else {
michael@0 1172 /* Just cut in 1/2 */
michael@0 1173 net->cwnd /= 2;
michael@0 1174 }
michael@0 1175 /* Drop to CA */
michael@0 1176 net->ssthresh = net->cwnd - (num_pkt_lost * net->mtu);
michael@0 1177 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 1178 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT);
michael@0 1179 }
michael@0 1180 } else {
michael@0 1181 /* Further tuning down required over the drastic orginal cut */
michael@0 1182 net->ssthresh -= (net->mtu * num_pkt_lost);
michael@0 1183 net->cwnd -= (net->mtu * num_pkt_lost);
michael@0 1184 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 1185 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT);
michael@0 1186 }
michael@0 1187
michael@0 1188 }
michael@0 1189 SCTP_STAT_INCR(sctps_ecnereducedcwnd);
michael@0 1190 } else {
michael@0 1191 if (in_window == 0) {
michael@0 1192 SCTP_STAT_INCR(sctps_ecnereducedcwnd);
michael@0 1193 net->ssthresh = net->cwnd / 2;
michael@0 1194 if (net->ssthresh < net->mtu) {
michael@0 1195 net->ssthresh = net->mtu;
michael@0 1196 /* here back off the timer as well, to slow us down */
michael@0 1197 net->RTO <<= 1;
michael@0 1198 }
michael@0 1199 net->cwnd = net->ssthresh;
michael@0 1200 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 1201 SDT_PROBE(sctp, cwnd, net, ecn,
michael@0 1202 stcb->asoc.my_vtag,
michael@0 1203 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
michael@0 1204 net,
michael@0 1205 old_cwnd, net->cwnd);
michael@0 1206 #endif
michael@0 1207 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 1208 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT);
michael@0 1209 }
michael@0 1210 }
michael@0 1211 }
michael@0 1212
michael@0 1213 }
michael@0 1214
michael@0 1215 static void
michael@0 1216 sctp_cwnd_update_after_packet_dropped(struct sctp_tcb *stcb,
michael@0 1217 struct sctp_nets *net, struct sctp_pktdrop_chunk *cp,
michael@0 1218 uint32_t *bottle_bw, uint32_t *on_queue)
michael@0 1219 {
michael@0 1220 uint32_t bw_avail;
michael@0 1221 int rtt;
michael@0 1222 unsigned int incr;
michael@0 1223 int old_cwnd = net->cwnd;
michael@0 1224
michael@0 1225 /* need real RTT in msd for this calc */
michael@0 1226 rtt = net->rtt / 1000;
michael@0 1227 /* get bottle neck bw */
michael@0 1228 *bottle_bw = ntohl(cp->bottle_bw);
michael@0 1229 /* and whats on queue */
michael@0 1230 *on_queue = ntohl(cp->current_onq);
michael@0 1231 /*
michael@0 1232 * adjust the on-queue if our flight is more it could be
michael@0 1233 * that the router has not yet gotten data "in-flight" to it
michael@0 1234 */
michael@0 1235 if (*on_queue < net->flight_size)
michael@0 1236 *on_queue = net->flight_size;
michael@0 1237 /* calculate the available space */
michael@0 1238 bw_avail = (*bottle_bw * rtt) / 1000;
michael@0 1239 if (bw_avail > *bottle_bw) {
michael@0 1240 /*
michael@0 1241 * Cap the growth to no more than the bottle neck.
michael@0 1242 * This can happen as RTT slides up due to queues.
michael@0 1243 * It also means if you have more than a 1 second
michael@0 1244 * RTT with a empty queue you will be limited to the
michael@0 1245 * bottle_bw per second no matter if other points
michael@0 1246 * have 1/2 the RTT and you could get more out...
michael@0 1247 */
michael@0 1248 bw_avail = *bottle_bw;
michael@0 1249 }
michael@0 1250 if (*on_queue > bw_avail) {
michael@0 1251 /*
michael@0 1252 * No room for anything else don't allow anything
michael@0 1253 * else to be "added to the fire".
michael@0 1254 */
michael@0 1255 int seg_inflight, seg_onqueue, my_portion;
michael@0 1256 net->partial_bytes_acked = 0;
michael@0 1257
michael@0 1258 /* how much are we over queue size? */
michael@0 1259 incr = *on_queue - bw_avail;
michael@0 1260 if (stcb->asoc.seen_a_sack_this_pkt) {
michael@0 1261 /*
michael@0 1262 * undo any cwnd adjustment that the sack
michael@0 1263 * might have made
michael@0 1264 */
michael@0 1265 net->cwnd = net->prev_cwnd;
michael@0 1266 }
michael@0 1267 /* Now how much of that is mine? */
michael@0 1268 seg_inflight = net->flight_size / net->mtu;
michael@0 1269 seg_onqueue = *on_queue / net->mtu;
michael@0 1270 my_portion = (incr * seg_inflight) / seg_onqueue;
michael@0 1271
michael@0 1272 /* Have I made an adjustment already */
michael@0 1273 if (net->cwnd > net->flight_size) {
michael@0 1274 /*
michael@0 1275 * for this flight I made an adjustment we
michael@0 1276 * need to decrease the portion by a share
michael@0 1277 * our previous adjustment.
michael@0 1278 */
michael@0 1279 int diff_adj;
michael@0 1280
michael@0 1281 diff_adj = net->cwnd - net->flight_size;
michael@0 1282 if (diff_adj > my_portion)
michael@0 1283 my_portion = 0;
michael@0 1284 else
michael@0 1285 my_portion -= diff_adj;
michael@0 1286 }
michael@0 1287 /*
michael@0 1288 * back down to the previous cwnd (assume we have
michael@0 1289 * had a sack before this packet). minus what ever
michael@0 1290 * portion of the overage is my fault.
michael@0 1291 */
michael@0 1292 net->cwnd -= my_portion;
michael@0 1293
michael@0 1294 /* we will NOT back down more than 1 MTU */
michael@0 1295 if (net->cwnd <= net->mtu) {
michael@0 1296 net->cwnd = net->mtu;
michael@0 1297 }
michael@0 1298 /* force into CA */
michael@0 1299 net->ssthresh = net->cwnd - 1;
michael@0 1300 } else {
michael@0 1301 /*
michael@0 1302 * Take 1/4 of the space left or max burst up ..
michael@0 1303 * whichever is less.
michael@0 1304 */
michael@0 1305 incr = (bw_avail - *on_queue) >> 2;
michael@0 1306 if ((stcb->asoc.max_burst > 0) &&
michael@0 1307 (stcb->asoc.max_burst * net->mtu < incr)) {
michael@0 1308 incr = stcb->asoc.max_burst * net->mtu;
michael@0 1309 }
michael@0 1310 net->cwnd += incr;
michael@0 1311 }
michael@0 1312 if (net->cwnd > bw_avail) {
michael@0 1313 /* We can't exceed the pipe size */
michael@0 1314 net->cwnd = bw_avail;
michael@0 1315 }
michael@0 1316 if (net->cwnd < net->mtu) {
michael@0 1317 /* We always have 1 MTU */
michael@0 1318 net->cwnd = net->mtu;
michael@0 1319 }
michael@0 1320
michael@0 1321 if (net->cwnd - old_cwnd != 0) {
michael@0 1322 /* log only changes */
michael@0 1323 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 1324 SDT_PROBE(sctp, cwnd, net, pd,
michael@0 1325 stcb->asoc.my_vtag,
michael@0 1326 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
michael@0 1327 net,
michael@0 1328 old_cwnd, net->cwnd);
michael@0 1329 #endif
michael@0 1330 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 1331 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd),
michael@0 1332 SCTP_CWND_LOG_FROM_SAT);
michael@0 1333 }
michael@0 1334 }
michael@0 1335 }
michael@0 1336
michael@0 1337 static void
michael@0 1338 sctp_cwnd_update_after_output(struct sctp_tcb *stcb,
michael@0 1339 struct sctp_nets *net, int burst_limit)
michael@0 1340 {
michael@0 1341 int old_cwnd = net->cwnd;
michael@0 1342
michael@0 1343 if (net->ssthresh < net->cwnd)
michael@0 1344 net->ssthresh = net->cwnd;
michael@0 1345 if (burst_limit) {
michael@0 1346 net->cwnd = (net->flight_size + (burst_limit * net->mtu));
michael@0 1347 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 1348 SDT_PROBE(sctp, cwnd, net, bl,
michael@0 1349 stcb->asoc.my_vtag,
michael@0 1350 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)),
michael@0 1351 net,
michael@0 1352 old_cwnd, net->cwnd);
michael@0 1353 #endif
michael@0 1354 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 1355 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_BRST);
michael@0 1356 }
michael@0 1357 }
michael@0 1358 }
michael@0 1359
michael@0 1360 static void
michael@0 1361 sctp_cwnd_update_after_sack(struct sctp_tcb *stcb,
michael@0 1362 struct sctp_association *asoc,
michael@0 1363 int accum_moved, int reneged_all, int will_exit)
michael@0 1364 {
michael@0 1365 /* Passing a zero argument in last disables the rtcc algoritm */
michael@0 1366 sctp_cwnd_update_after_sack_common(stcb, asoc, accum_moved, reneged_all, will_exit, 0);
michael@0 1367 }
michael@0 1368
michael@0 1369 static void
michael@0 1370 sctp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
michael@0 1371 int in_window, int num_pkt_lost)
michael@0 1372 {
michael@0 1373 /* Passing a zero argument in last disables the rtcc algoritm */
michael@0 1374 sctp_cwnd_update_after_ecn_echo_common(stcb, net, in_window, num_pkt_lost, 0);
michael@0 1375 }
michael@0 1376
michael@0 1377 /* Here starts the RTCCVAR type CC invented by RRS which
michael@0 1378 * is a slight mod to RFC2581. We reuse a common routine or
michael@0 1379 * two since these algoritms are so close and need to
michael@0 1380 * remain the same.
michael@0 1381 */
michael@0 1382 static void
michael@0 1383 sctp_cwnd_update_rtcc_after_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
michael@0 1384 int in_window, int num_pkt_lost)
michael@0 1385 {
michael@0 1386 sctp_cwnd_update_after_ecn_echo_common(stcb, net, in_window, num_pkt_lost, 1);
michael@0 1387 }
michael@0 1388
michael@0 1389
michael@0 1390 static
michael@0 1391 void sctp_cwnd_update_rtcc_tsn_acknowledged(struct sctp_nets *net,
michael@0 1392 struct sctp_tmit_chunk *tp1)
michael@0 1393 {
michael@0 1394 net->cc_mod.rtcc.bw_bytes += tp1->send_size;
michael@0 1395 }
michael@0 1396
michael@0 1397 static void
michael@0 1398 sctp_cwnd_prepare_rtcc_net_for_sack(struct sctp_tcb *stcb SCTP_UNUSED,
michael@0 1399 struct sctp_nets *net)
michael@0 1400 {
michael@0 1401 if (net->cc_mod.rtcc.tls_needs_set > 0) {
michael@0 1402 /* We had a bw measurment going on */
michael@0 1403 struct timeval ltls;
michael@0 1404 SCTP_GETPTIME_TIMEVAL(&ltls);
michael@0 1405 timevalsub(&ltls, &net->cc_mod.rtcc.tls);
michael@0 1406 net->cc_mod.rtcc.new_tot_time = (ltls.tv_sec * 1000000) + ltls.tv_usec;
michael@0 1407 }
michael@0 1408 }
michael@0 1409
michael@0 1410 static void
michael@0 1411 sctp_cwnd_new_rtcc_transmission_begins(struct sctp_tcb *stcb,
michael@0 1412 struct sctp_nets *net)
michael@0 1413 {
michael@0 1414 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 1415 uint64_t vtag, probepoint;
michael@0 1416
michael@0 1417 #endif
michael@0 1418 if (net->cc_mod.rtcc.lbw) {
michael@0 1419 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 1420 /* Clear the old bw.. we went to 0 in-flight */
michael@0 1421 vtag = (net->rtt << 32) | (((uint32_t)(stcb->sctp_ep->sctp_lport)) << 16) |
michael@0 1422 (stcb->rport);
michael@0 1423 probepoint = (((uint64_t)net->cwnd) << 32);
michael@0 1424 /* Probe point 8 */
michael@0 1425 probepoint |= ((8 << 16) | 0);
michael@0 1426 SDT_PROBE(sctp, cwnd, net, rttvar,
michael@0 1427 vtag,
michael@0 1428 ((net->cc_mod.rtcc.lbw << 32) | 0),
michael@0 1429 ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt),
michael@0 1430 net->flight_size,
michael@0 1431 probepoint);
michael@0 1432 #endif
michael@0 1433 net->cc_mod.rtcc.lbw_rtt = 0;
michael@0 1434 net->cc_mod.rtcc.cwnd_at_bw_set = 0;
michael@0 1435 net->cc_mod.rtcc.lbw = 0;
michael@0 1436 net->cc_mod.rtcc.bw_bytes_at_last_rttc = 0;
michael@0 1437 net->cc_mod.rtcc.vol_reduce = 0;
michael@0 1438 net->cc_mod.rtcc.bw_tot_time = 0;
michael@0 1439 net->cc_mod.rtcc.bw_bytes = 0;
michael@0 1440 net->cc_mod.rtcc.tls_needs_set = 0;
michael@0 1441 if (net->cc_mod.rtcc.steady_step) {
michael@0 1442 net->cc_mod.rtcc.vol_reduce = 0;
michael@0 1443 net->cc_mod.rtcc.step_cnt = 0;
michael@0 1444 net->cc_mod.rtcc.last_step_state = 0;
michael@0 1445 }
michael@0 1446 if (net->cc_mod.rtcc.ret_from_eq) {
michael@0 1447 /* less aggressive one - reset cwnd too */
michael@0 1448 uint32_t cwnd_in_mtu, cwnd;
michael@0 1449
michael@0 1450 cwnd_in_mtu = SCTP_BASE_SYSCTL(sctp_initial_cwnd);
michael@0 1451 if (cwnd_in_mtu == 0) {
michael@0 1452 /* Using 0 means that the value of RFC 4960 is used. */
michael@0 1453 cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND));
michael@0 1454 } else {
michael@0 1455 /*
michael@0 1456 * We take the minimum of the burst limit and the
michael@0 1457 * initial congestion window.
michael@0 1458 */
michael@0 1459 if ((stcb->asoc.max_burst > 0) && (cwnd_in_mtu > stcb->asoc.max_burst))
michael@0 1460 cwnd_in_mtu = stcb->asoc.max_burst;
michael@0 1461 cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu;
michael@0 1462 }
michael@0 1463 if (net->cwnd > cwnd) {
michael@0 1464 /* Only set if we are not a timeout (i.e. down to 1 mtu) */
michael@0 1465 net->cwnd = cwnd;
michael@0 1466 }
michael@0 1467 }
michael@0 1468 }
michael@0 1469 }
michael@0 1470
michael@0 1471 static void
michael@0 1472 sctp_set_rtcc_initial_cc_param(struct sctp_tcb *stcb,
michael@0 1473 struct sctp_nets *net)
michael@0 1474 {
michael@0 1475 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 1476 uint64_t vtag, probepoint;
michael@0 1477
michael@0 1478 #endif
michael@0 1479 sctp_set_initial_cc_param(stcb, net);
michael@0 1480 stcb->asoc.use_precise_time = 1;
michael@0 1481 #if defined(__FreeBSD__) && __FreeBSD_version >= 803000
michael@0 1482 probepoint = (((uint64_t)net->cwnd) << 32);
michael@0 1483 probepoint |= ((9 << 16) | 0);
michael@0 1484 vtag = (net->rtt << 32) |
michael@0 1485 (((uint32_t)(stcb->sctp_ep->sctp_lport)) << 16) |
michael@0 1486 (stcb->rport);
michael@0 1487 SDT_PROBE(sctp, cwnd, net, rttvar,
michael@0 1488 vtag,
michael@0 1489 0,
michael@0 1490 0,
michael@0 1491 0,
michael@0 1492 probepoint);
michael@0 1493 #endif
michael@0 1494 net->cc_mod.rtcc.lbw_rtt = 0;
michael@0 1495 net->cc_mod.rtcc.cwnd_at_bw_set = 0;
michael@0 1496 net->cc_mod.rtcc.vol_reduce = 0;
michael@0 1497 net->cc_mod.rtcc.lbw = 0;
michael@0 1498 net->cc_mod.rtcc.vol_reduce = 0;
michael@0 1499 net->cc_mod.rtcc.bw_bytes_at_last_rttc = 0;
michael@0 1500 net->cc_mod.rtcc.bw_tot_time = 0;
michael@0 1501 net->cc_mod.rtcc.bw_bytes = 0;
michael@0 1502 net->cc_mod.rtcc.tls_needs_set = 0;
michael@0 1503 net->cc_mod.rtcc.ret_from_eq = SCTP_BASE_SYSCTL(sctp_rttvar_eqret);
michael@0 1504 net->cc_mod.rtcc.steady_step = SCTP_BASE_SYSCTL(sctp_steady_step);
michael@0 1505 net->cc_mod.rtcc.use_dccc_ecn = SCTP_BASE_SYSCTL(sctp_use_dccc_ecn);
michael@0 1506 net->cc_mod.rtcc.step_cnt = 0;
michael@0 1507 net->cc_mod.rtcc.last_step_state = 0;
michael@0 1508
michael@0 1509
michael@0 1510 }
michael@0 1511
michael@0 1512 static int
michael@0 1513 sctp_cwnd_rtcc_socket_option(struct sctp_tcb *stcb, int setorget,
michael@0 1514 struct sctp_cc_option *cc_opt)
michael@0 1515 {
michael@0 1516 struct sctp_nets *net;
michael@0 1517 if (setorget == 1) {
michael@0 1518 /* a set */
michael@0 1519 if (cc_opt->option == SCTP_CC_OPT_RTCC_SETMODE) {
michael@0 1520 if ((cc_opt->aid_value.assoc_value != 0) &&
michael@0 1521 (cc_opt->aid_value.assoc_value != 1)) {
michael@0 1522 return (EINVAL);
michael@0 1523 }
michael@0 1524 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
michael@0 1525 net->cc_mod.rtcc.ret_from_eq = cc_opt->aid_value.assoc_value;
michael@0 1526 }
michael@0 1527 } else if (cc_opt->option == SCTP_CC_OPT_USE_DCCC_ECN) {
michael@0 1528 if ((cc_opt->aid_value.assoc_value != 0) &&
michael@0 1529 (cc_opt->aid_value.assoc_value != 1)) {
michael@0 1530 return (EINVAL);
michael@0 1531 }
michael@0 1532 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
michael@0 1533 net->cc_mod.rtcc.use_dccc_ecn = cc_opt->aid_value.assoc_value;
michael@0 1534 }
michael@0 1535 } else if (cc_opt->option == SCTP_CC_OPT_STEADY_STEP) {
michael@0 1536 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
michael@0 1537 net->cc_mod.rtcc.steady_step = cc_opt->aid_value.assoc_value;
michael@0 1538 }
michael@0 1539 } else {
michael@0 1540 return (EINVAL);
michael@0 1541 }
michael@0 1542 } else {
michael@0 1543 /* a get */
michael@0 1544 if (cc_opt->option == SCTP_CC_OPT_RTCC_SETMODE) {
michael@0 1545 net = TAILQ_FIRST(&stcb->asoc.nets);
michael@0 1546 if (net == NULL) {
michael@0 1547 return (EFAULT);
michael@0 1548 }
michael@0 1549 cc_opt->aid_value.assoc_value = net->cc_mod.rtcc.ret_from_eq;
michael@0 1550 } else if (cc_opt->option == SCTP_CC_OPT_USE_DCCC_ECN) {
michael@0 1551 net = TAILQ_FIRST(&stcb->asoc.nets);
michael@0 1552 if (net == NULL) {
michael@0 1553 return (EFAULT);
michael@0 1554 }
michael@0 1555 cc_opt->aid_value.assoc_value = net->cc_mod.rtcc.use_dccc_ecn;
michael@0 1556 } else if (cc_opt->option == SCTP_CC_OPT_STEADY_STEP) {
michael@0 1557 net = TAILQ_FIRST(&stcb->asoc.nets);
michael@0 1558 if (net == NULL) {
michael@0 1559 return (EFAULT);
michael@0 1560 }
michael@0 1561 cc_opt->aid_value.assoc_value = net->cc_mod.rtcc.steady_step;
michael@0 1562 } else {
michael@0 1563 return (EINVAL);
michael@0 1564 }
michael@0 1565 }
michael@0 1566 return (0);
michael@0 1567 }
michael@0 1568
michael@0 1569 static void
michael@0 1570 sctp_cwnd_update_rtcc_packet_transmitted(struct sctp_tcb *stcb SCTP_UNUSED,
michael@0 1571 struct sctp_nets *net)
michael@0 1572 {
michael@0 1573 if (net->cc_mod.rtcc.tls_needs_set == 0) {
michael@0 1574 SCTP_GETPTIME_TIMEVAL(&net->cc_mod.rtcc.tls);
michael@0 1575 net->cc_mod.rtcc.tls_needs_set = 2;
michael@0 1576 }
michael@0 1577 }
michael@0 1578
michael@0 1579 static void
michael@0 1580 sctp_cwnd_update_rtcc_after_sack(struct sctp_tcb *stcb,
michael@0 1581 struct sctp_association *asoc,
michael@0 1582 int accum_moved, int reneged_all, int will_exit)
michael@0 1583 {
michael@0 1584 /* Passing a one argument at the last enables the rtcc algoritm */
michael@0 1585 sctp_cwnd_update_after_sack_common(stcb, asoc, accum_moved, reneged_all, will_exit, 1);
michael@0 1586 }
michael@0 1587
michael@0 1588 static void
michael@0 1589 sctp_rtt_rtcc_calculated(struct sctp_tcb *stcb SCTP_UNUSED,
michael@0 1590 struct sctp_nets *net,
michael@0 1591 struct timeval *now SCTP_UNUSED)
michael@0 1592 {
michael@0 1593 net->cc_mod.rtcc.rtt_set_this_sack = 1;
michael@0 1594 }
michael@0 1595
michael@0 1596 /* Here starts Sally Floyds HS-TCP */
michael@0 1597
michael@0 1598 struct sctp_hs_raise_drop {
michael@0 1599 int32_t cwnd;
michael@0 1600 int32_t increase;
michael@0 1601 int32_t drop_percent;
michael@0 1602 };
michael@0 1603
michael@0 1604 #define SCTP_HS_TABLE_SIZE 73
michael@0 1605
michael@0 1606 struct sctp_hs_raise_drop sctp_cwnd_adjust[SCTP_HS_TABLE_SIZE] = {
michael@0 1607 {38, 1, 50}, /* 0 */
michael@0 1608 {118, 2, 44}, /* 1 */
michael@0 1609 {221, 3, 41}, /* 2 */
michael@0 1610 {347, 4, 38}, /* 3 */
michael@0 1611 {495, 5, 37}, /* 4 */
michael@0 1612 {663, 6, 35}, /* 5 */
michael@0 1613 {851, 7, 34}, /* 6 */
michael@0 1614 {1058, 8, 33}, /* 7 */
michael@0 1615 {1284, 9, 32}, /* 8 */
michael@0 1616 {1529, 10, 31}, /* 9 */
michael@0 1617 {1793, 11, 30}, /* 10 */
michael@0 1618 {2076, 12, 29}, /* 11 */
michael@0 1619 {2378, 13, 28}, /* 12 */
michael@0 1620 {2699, 14, 28}, /* 13 */
michael@0 1621 {3039, 15, 27}, /* 14 */
michael@0 1622 {3399, 16, 27}, /* 15 */
michael@0 1623 {3778, 17, 26}, /* 16 */
michael@0 1624 {4177, 18, 26}, /* 17 */
michael@0 1625 {4596, 19, 25}, /* 18 */
michael@0 1626 {5036, 20, 25}, /* 19 */
michael@0 1627 {5497, 21, 24}, /* 20 */
michael@0 1628 {5979, 22, 24}, /* 21 */
michael@0 1629 {6483, 23, 23}, /* 22 */
michael@0 1630 {7009, 24, 23}, /* 23 */
michael@0 1631 {7558, 25, 22}, /* 24 */
michael@0 1632 {8130, 26, 22}, /* 25 */
michael@0 1633 {8726, 27, 22}, /* 26 */
michael@0 1634 {9346, 28, 21}, /* 27 */
michael@0 1635 {9991, 29, 21}, /* 28 */
michael@0 1636 {10661, 30, 21}, /* 29 */
michael@0 1637 {11358, 31, 20}, /* 30 */
michael@0 1638 {12082, 32, 20}, /* 31 */
michael@0 1639 {12834, 33, 20}, /* 32 */
michael@0 1640 {13614, 34, 19}, /* 33 */
michael@0 1641 {14424, 35, 19}, /* 34 */
michael@0 1642 {15265, 36, 19}, /* 35 */
michael@0 1643 {16137, 37, 19}, /* 36 */
michael@0 1644 {17042, 38, 18}, /* 37 */
michael@0 1645 {17981, 39, 18}, /* 38 */
michael@0 1646 {18955, 40, 18}, /* 39 */
michael@0 1647 {19965, 41, 17}, /* 40 */
michael@0 1648 {21013, 42, 17}, /* 41 */
michael@0 1649 {22101, 43, 17}, /* 42 */
michael@0 1650 {23230, 44, 17}, /* 43 */
michael@0 1651 {24402, 45, 16}, /* 44 */
michael@0 1652 {25618, 46, 16}, /* 45 */
michael@0 1653 {26881, 47, 16}, /* 46 */
michael@0 1654 {28193, 48, 16}, /* 47 */
michael@0 1655 {29557, 49, 15}, /* 48 */
michael@0 1656 {30975, 50, 15}, /* 49 */
michael@0 1657 {32450, 51, 15}, /* 50 */
michael@0 1658 {33986, 52, 15}, /* 51 */
michael@0 1659 {35586, 53, 14}, /* 52 */
michael@0 1660 {37253, 54, 14}, /* 53 */
michael@0 1661 {38992, 55, 14}, /* 54 */
michael@0 1662 {40808, 56, 14}, /* 55 */
michael@0 1663 {42707, 57, 13}, /* 56 */
michael@0 1664 {44694, 58, 13}, /* 57 */
michael@0 1665 {46776, 59, 13}, /* 58 */
michael@0 1666 {48961, 60, 13}, /* 59 */
michael@0 1667 {51258, 61, 13}, /* 60 */
michael@0 1668 {53677, 62, 12}, /* 61 */
michael@0 1669 {56230, 63, 12}, /* 62 */
michael@0 1670 {58932, 64, 12}, /* 63 */
michael@0 1671 {61799, 65, 12}, /* 64 */
michael@0 1672 {64851, 66, 11}, /* 65 */
michael@0 1673 {68113, 67, 11}, /* 66 */
michael@0 1674 {71617, 68, 11}, /* 67 */
michael@0 1675 {75401, 69, 10}, /* 68 */
michael@0 1676 {79517, 70, 10}, /* 69 */
michael@0 1677 {84035, 71, 10}, /* 70 */
michael@0 1678 {89053, 72, 10}, /* 71 */
michael@0 1679 {94717, 73, 9} /* 72 */
michael@0 1680 };
michael@0 1681
michael@0 1682 static void
michael@0 1683 sctp_hs_cwnd_increase(struct sctp_tcb *stcb, struct sctp_nets *net)
michael@0 1684 {
michael@0 1685 int cur_val, i, indx, incr;
michael@0 1686
michael@0 1687 cur_val = net->cwnd >> 10;
michael@0 1688 indx = SCTP_HS_TABLE_SIZE - 1;
michael@0 1689
michael@0 1690 if (cur_val < sctp_cwnd_adjust[0].cwnd) {
michael@0 1691 /* normal mode */
michael@0 1692 if (net->net_ack > net->mtu) {
michael@0 1693 net->cwnd += net->mtu;
michael@0 1694 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 1695 sctp_log_cwnd(stcb, net, net->mtu, SCTP_CWND_LOG_FROM_SS);
michael@0 1696 }
michael@0 1697 } else {
michael@0 1698 net->cwnd += net->net_ack;
michael@0 1699 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 1700 sctp_log_cwnd(stcb, net, net->net_ack, SCTP_CWND_LOG_FROM_SS);
michael@0 1701 }
michael@0 1702 }
michael@0 1703 } else {
michael@0 1704 for (i = net->last_hs_used; i < SCTP_HS_TABLE_SIZE; i++) {
michael@0 1705 if (cur_val < sctp_cwnd_adjust[i].cwnd) {
michael@0 1706 indx = i;
michael@0 1707 break;
michael@0 1708 }
michael@0 1709 }
michael@0 1710 net->last_hs_used = indx;
michael@0 1711 incr = ((sctp_cwnd_adjust[indx].increase) << 10);
michael@0 1712 net->cwnd += incr;
michael@0 1713 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 1714 sctp_log_cwnd(stcb, net, incr, SCTP_CWND_LOG_FROM_SS);
michael@0 1715 }
michael@0 1716 }
michael@0 1717 }
michael@0 1718
michael@0 1719 static void
michael@0 1720 sctp_hs_cwnd_decrease(struct sctp_tcb *stcb, struct sctp_nets *net)
michael@0 1721 {
michael@0 1722 int cur_val, i, indx;
michael@0 1723 int old_cwnd = net->cwnd;
michael@0 1724
michael@0 1725 cur_val = net->cwnd >> 10;
michael@0 1726 if (cur_val < sctp_cwnd_adjust[0].cwnd) {
michael@0 1727 /* normal mode */
michael@0 1728 net->ssthresh = net->cwnd / 2;
michael@0 1729 if (net->ssthresh < (net->mtu * 2)) {
michael@0 1730 net->ssthresh = 2 * net->mtu;
michael@0 1731 }
michael@0 1732 net->cwnd = net->ssthresh;
michael@0 1733 } else {
michael@0 1734 /* drop by the proper amount */
michael@0 1735 net->ssthresh = net->cwnd - (int)((net->cwnd / 100) *
michael@0 1736 sctp_cwnd_adjust[net->last_hs_used].drop_percent);
michael@0 1737 net->cwnd = net->ssthresh;
michael@0 1738 /* now where are we */
michael@0 1739 indx = net->last_hs_used;
michael@0 1740 cur_val = net->cwnd >> 10;
michael@0 1741 /* reset where we are in the table */
michael@0 1742 if (cur_val < sctp_cwnd_adjust[0].cwnd) {
michael@0 1743 /* feel out of hs */
michael@0 1744 net->last_hs_used = 0;
michael@0 1745 } else {
michael@0 1746 for (i = indx; i >= 1; i--) {
michael@0 1747 if (cur_val > sctp_cwnd_adjust[i - 1].cwnd) {
michael@0 1748 break;
michael@0 1749 }
michael@0 1750 }
michael@0 1751 net->last_hs_used = indx;
michael@0 1752 }
michael@0 1753 }
michael@0 1754 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 1755 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_FR);
michael@0 1756 }
michael@0 1757 }
michael@0 1758
michael@0 1759 static void
michael@0 1760 sctp_hs_cwnd_update_after_fr(struct sctp_tcb *stcb,
michael@0 1761 struct sctp_association *asoc)
michael@0 1762 {
michael@0 1763 struct sctp_nets *net;
michael@0 1764 /*
michael@0 1765 * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) &&
michael@0 1766 * (net->fast_retran_loss_recovery == 0)))
michael@0 1767 */
michael@0 1768 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
michael@0 1769 if ((asoc->fast_retran_loss_recovery == 0) ||
michael@0 1770 (asoc->sctp_cmt_on_off > 0)) {
michael@0 1771 /* out of a RFC2582 Fast recovery window? */
michael@0 1772 if (net->net_ack > 0) {
michael@0 1773 /*
michael@0 1774 * per section 7.2.3, are there any
michael@0 1775 * destinations that had a fast retransmit
michael@0 1776 * to them. If so what we need to do is
michael@0 1777 * adjust ssthresh and cwnd.
michael@0 1778 */
michael@0 1779 struct sctp_tmit_chunk *lchk;
michael@0 1780
michael@0 1781 sctp_hs_cwnd_decrease(stcb, net);
michael@0 1782
michael@0 1783 lchk = TAILQ_FIRST(&asoc->send_queue);
michael@0 1784
michael@0 1785 net->partial_bytes_acked = 0;
michael@0 1786 /* Turn on fast recovery window */
michael@0 1787 asoc->fast_retran_loss_recovery = 1;
michael@0 1788 if (lchk == NULL) {
michael@0 1789 /* Mark end of the window */
michael@0 1790 asoc->fast_recovery_tsn = asoc->sending_seq - 1;
michael@0 1791 } else {
michael@0 1792 asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1;
michael@0 1793 }
michael@0 1794
michael@0 1795 /*
michael@0 1796 * CMT fast recovery -- per destination
michael@0 1797 * recovery variable.
michael@0 1798 */
michael@0 1799 net->fast_retran_loss_recovery = 1;
michael@0 1800
michael@0 1801 if (lchk == NULL) {
michael@0 1802 /* Mark end of the window */
michael@0 1803 net->fast_recovery_tsn = asoc->sending_seq - 1;
michael@0 1804 } else {
michael@0 1805 net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1;
michael@0 1806 }
michael@0 1807
michael@0 1808 sctp_timer_stop(SCTP_TIMER_TYPE_SEND,
michael@0 1809 stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA+SCTP_LOC_32);
michael@0 1810 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
michael@0 1811 stcb->sctp_ep, stcb, net);
michael@0 1812 }
michael@0 1813 } else if (net->net_ack > 0) {
michael@0 1814 /*
michael@0 1815 * Mark a peg that we WOULD have done a cwnd
michael@0 1816 * reduction but RFC2582 prevented this action.
michael@0 1817 */
michael@0 1818 SCTP_STAT_INCR(sctps_fastretransinrtt);
michael@0 1819 }
michael@0 1820 }
michael@0 1821 }
michael@0 1822
michael@0 1823 static void
michael@0 1824 sctp_hs_cwnd_update_after_sack(struct sctp_tcb *stcb,
michael@0 1825 struct sctp_association *asoc,
michael@0 1826 int accum_moved, int reneged_all SCTP_UNUSED, int will_exit)
michael@0 1827 {
michael@0 1828 struct sctp_nets *net;
michael@0 1829 /******************************/
michael@0 1830 /* update cwnd and Early FR */
michael@0 1831 /******************************/
michael@0 1832 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
michael@0 1833
michael@0 1834 #ifdef JANA_CMT_FAST_RECOVERY
michael@0 1835 /*
michael@0 1836 * CMT fast recovery code. Need to debug.
michael@0 1837 */
michael@0 1838 if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) {
michael@0 1839 if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) ||
michael@0 1840 SCTP_TSN_GE(net->pseudo_cumack,net->fast_recovery_tsn)) {
michael@0 1841 net->will_exit_fast_recovery = 1;
michael@0 1842 }
michael@0 1843 }
michael@0 1844 #endif
michael@0 1845 /* if nothing was acked on this destination skip it */
michael@0 1846 if (net->net_ack == 0) {
michael@0 1847 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
michael@0 1848 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK);
michael@0 1849 }
michael@0 1850 continue;
michael@0 1851 }
michael@0 1852 #ifdef JANA_CMT_FAST_RECOVERY
michael@0 1853 /* CMT fast recovery code
michael@0 1854 */
michael@0 1855 /*
michael@0 1856 if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery && net->will_exit_fast_recovery == 0) {
michael@0 1857 @@@ Do something
michael@0 1858 }
michael@0 1859 else if (sctp_cmt_on_off == 0 && asoc->fast_retran_loss_recovery && will_exit == 0) {
michael@0 1860 */
michael@0 1861 #endif
michael@0 1862
michael@0 1863 if (asoc->fast_retran_loss_recovery &&
michael@0 1864 (will_exit == 0) &&
michael@0 1865 (asoc->sctp_cmt_on_off == 0)) {
michael@0 1866 /*
michael@0 1867 * If we are in loss recovery we skip any cwnd
michael@0 1868 * update
michael@0 1869 */
michael@0 1870 return;
michael@0 1871 }
michael@0 1872 /*
michael@0 1873 * CMT: CUC algorithm. Update cwnd if pseudo-cumack has
michael@0 1874 * moved.
michael@0 1875 */
michael@0 1876 if (accum_moved ||
michael@0 1877 ((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) {
michael@0 1878 /* If the cumulative ack moved we can proceed */
michael@0 1879 if (net->cwnd <= net->ssthresh) {
michael@0 1880 /* We are in slow start */
michael@0 1881 if (net->flight_size + net->net_ack >= net->cwnd) {
michael@0 1882
michael@0 1883 sctp_hs_cwnd_increase(stcb, net);
michael@0 1884
michael@0 1885 } else {
michael@0 1886 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
michael@0 1887 sctp_log_cwnd(stcb, net, net->net_ack,
michael@0 1888 SCTP_CWND_LOG_NOADV_SS);
michael@0 1889 }
michael@0 1890 }
michael@0 1891 } else {
michael@0 1892 /* We are in congestion avoidance */
michael@0 1893 net->partial_bytes_acked += net->net_ack;
michael@0 1894 if ((net->flight_size + net->net_ack >= net->cwnd) &&
michael@0 1895 (net->partial_bytes_acked >= net->cwnd)) {
michael@0 1896 net->partial_bytes_acked -= net->cwnd;
michael@0 1897 net->cwnd += net->mtu;
michael@0 1898 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 1899 sctp_log_cwnd(stcb, net, net->mtu,
michael@0 1900 SCTP_CWND_LOG_FROM_CA);
michael@0 1901 }
michael@0 1902 } else {
michael@0 1903 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
michael@0 1904 sctp_log_cwnd(stcb, net, net->net_ack,
michael@0 1905 SCTP_CWND_LOG_NOADV_CA);
michael@0 1906 }
michael@0 1907 }
michael@0 1908 }
michael@0 1909 } else {
michael@0 1910 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
michael@0 1911 sctp_log_cwnd(stcb, net, net->mtu,
michael@0 1912 SCTP_CWND_LOG_NO_CUMACK);
michael@0 1913 }
michael@0 1914 }
michael@0 1915 }
michael@0 1916 }
michael@0 1917
michael@0 1918
michael@0 1919 /*
michael@0 1920 * H-TCP congestion control. The algorithm is detailed in:
michael@0 1921 * R.N.Shorten, D.J.Leith:
michael@0 1922 * "H-TCP: TCP for high-speed and long-distance networks"
michael@0 1923 * Proc. PFLDnet, Argonne, 2004.
michael@0 1924 * http://www.hamilton.ie/net/htcp3.pdf
michael@0 1925 */
michael@0 1926
michael@0 1927
michael@0 1928 static int use_rtt_scaling = 1;
michael@0 1929 static int use_bandwidth_switch = 1;
michael@0 1930
michael@0 1931 static inline int
michael@0 1932 between(uint32_t seq1, uint32_t seq2, uint32_t seq3)
michael@0 1933 {
michael@0 1934 return (seq3 - seq2 >= seq1 - seq2);
michael@0 1935 }
michael@0 1936
michael@0 1937 static inline uint32_t
michael@0 1938 htcp_cong_time(struct htcp *ca)
michael@0 1939 {
michael@0 1940 return (sctp_get_tick_count() - ca->last_cong);
michael@0 1941 }
michael@0 1942
michael@0 1943 static inline uint32_t
michael@0 1944 htcp_ccount(struct htcp *ca)
michael@0 1945 {
michael@0 1946 return (htcp_cong_time(ca)/ca->minRTT);
michael@0 1947 }
michael@0 1948
michael@0 1949 static inline void
michael@0 1950 htcp_reset(struct htcp *ca)
michael@0 1951 {
michael@0 1952 ca->undo_last_cong = ca->last_cong;
michael@0 1953 ca->undo_maxRTT = ca->maxRTT;
michael@0 1954 ca->undo_old_maxB = ca->old_maxB;
michael@0 1955 ca->last_cong = sctp_get_tick_count();
michael@0 1956 }
michael@0 1957
michael@0 1958 #ifdef SCTP_NOT_USED
michael@0 1959
michael@0 1960 static uint32_t
michael@0 1961 htcp_cwnd_undo(struct sctp_tcb *stcb, struct sctp_nets *net)
michael@0 1962 {
michael@0 1963 net->cc_mod.htcp_ca.last_cong = net->cc_mod.htcp_ca.undo_last_cong;
michael@0 1964 net->cc_mod.htcp_ca.maxRTT = net->cc_mod.htcp_ca.undo_maxRTT;
michael@0 1965 net->cc_mod.htcp_ca.old_maxB = net->cc_mod.htcp_ca.undo_old_maxB;
michael@0 1966 return (max(net->cwnd, ((net->ssthresh/net->mtu<<7)/net->cc_mod.htcp_ca.beta)*net->mtu));
michael@0 1967 }
michael@0 1968
michael@0 1969 #endif
michael@0 1970
michael@0 1971 static inline void
michael@0 1972 measure_rtt(struct sctp_nets *net)
michael@0 1973 {
michael@0 1974 uint32_t srtt = net->lastsa>>SCTP_RTT_SHIFT;
michael@0 1975
michael@0 1976 /* keep track of minimum RTT seen so far, minRTT is zero at first */
michael@0 1977 if (net->cc_mod.htcp_ca.minRTT > srtt || !net->cc_mod.htcp_ca.minRTT)
michael@0 1978 net->cc_mod.htcp_ca.minRTT = srtt;
michael@0 1979
michael@0 1980 /* max RTT */
michael@0 1981 if (net->fast_retran_ip == 0 && net->ssthresh < 0xFFFF && htcp_ccount(&net->cc_mod.htcp_ca) > 3) {
michael@0 1982 if (net->cc_mod.htcp_ca.maxRTT < net->cc_mod.htcp_ca.minRTT)
michael@0 1983 net->cc_mod.htcp_ca.maxRTT = net->cc_mod.htcp_ca.minRTT;
michael@0 1984 if (net->cc_mod.htcp_ca.maxRTT < srtt && srtt <= net->cc_mod.htcp_ca.maxRTT+MSEC_TO_TICKS(20))
michael@0 1985 net->cc_mod.htcp_ca.maxRTT = srtt;
michael@0 1986 }
michael@0 1987 }
michael@0 1988
michael@0 1989 static void
michael@0 1990 measure_achieved_throughput(struct sctp_nets *net)
michael@0 1991 {
michael@0 1992 uint32_t now = sctp_get_tick_count();
michael@0 1993
michael@0 1994 if (net->fast_retran_ip == 0)
michael@0 1995 net->cc_mod.htcp_ca.bytes_acked = net->net_ack;
michael@0 1996
michael@0 1997 if (!use_bandwidth_switch)
michael@0 1998 return;
michael@0 1999
michael@0 2000 /* achieved throughput calculations */
michael@0 2001 /* JRS - not 100% sure of this statement */
michael@0 2002 if (net->fast_retran_ip == 1) {
michael@0 2003 net->cc_mod.htcp_ca.bytecount = 0;
michael@0 2004 net->cc_mod.htcp_ca.lasttime = now;
michael@0 2005 return;
michael@0 2006 }
michael@0 2007
michael@0 2008 net->cc_mod.htcp_ca.bytecount += net->net_ack;
michael@0 2009 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)) &&
michael@0 2010 (now - net->cc_mod.htcp_ca.lasttime >= net->cc_mod.htcp_ca.minRTT) &&
michael@0 2011 (net->cc_mod.htcp_ca.minRTT > 0)) {
michael@0 2012 uint32_t cur_Bi = net->cc_mod.htcp_ca.bytecount/net->mtu*hz/(now - net->cc_mod.htcp_ca.lasttime);
michael@0 2013
michael@0 2014 if (htcp_ccount(&net->cc_mod.htcp_ca) <= 3) {
michael@0 2015 /* just after backoff */
michael@0 2016 net->cc_mod.htcp_ca.minB = net->cc_mod.htcp_ca.maxB = net->cc_mod.htcp_ca.Bi = cur_Bi;
michael@0 2017 } else {
michael@0 2018 net->cc_mod.htcp_ca.Bi = (3*net->cc_mod.htcp_ca.Bi + cur_Bi)/4;
michael@0 2019 if (net->cc_mod.htcp_ca.Bi > net->cc_mod.htcp_ca.maxB)
michael@0 2020 net->cc_mod.htcp_ca.maxB = net->cc_mod.htcp_ca.Bi;
michael@0 2021 if (net->cc_mod.htcp_ca.minB > net->cc_mod.htcp_ca.maxB)
michael@0 2022 net->cc_mod.htcp_ca.minB = net->cc_mod.htcp_ca.maxB;
michael@0 2023 }
michael@0 2024 net->cc_mod.htcp_ca.bytecount = 0;
michael@0 2025 net->cc_mod.htcp_ca.lasttime = now;
michael@0 2026 }
michael@0 2027 }
michael@0 2028
michael@0 2029 static inline void
michael@0 2030 htcp_beta_update(struct htcp *ca, uint32_t minRTT, uint32_t maxRTT)
michael@0 2031 {
michael@0 2032 if (use_bandwidth_switch) {
michael@0 2033 uint32_t maxB = ca->maxB;
michael@0 2034 uint32_t old_maxB = ca->old_maxB;
michael@0 2035 ca->old_maxB = ca->maxB;
michael@0 2036
michael@0 2037 if (!between(5*maxB, 4*old_maxB, 6*old_maxB)) {
michael@0 2038 ca->beta = BETA_MIN;
michael@0 2039 ca->modeswitch = 0;
michael@0 2040 return;
michael@0 2041 }
michael@0 2042 }
michael@0 2043
michael@0 2044 if (ca->modeswitch && minRTT > (uint32_t)MSEC_TO_TICKS(10) && maxRTT) {
michael@0 2045 ca->beta = (minRTT<<7)/maxRTT;
michael@0 2046 if (ca->beta < BETA_MIN)
michael@0 2047 ca->beta = BETA_MIN;
michael@0 2048 else if (ca->beta > BETA_MAX)
michael@0 2049 ca->beta = BETA_MAX;
michael@0 2050 } else {
michael@0 2051 ca->beta = BETA_MIN;
michael@0 2052 ca->modeswitch = 1;
michael@0 2053 }
michael@0 2054 }
michael@0 2055
michael@0 2056 static inline void
michael@0 2057 htcp_alpha_update(struct htcp *ca)
michael@0 2058 {
michael@0 2059 uint32_t minRTT = ca->minRTT;
michael@0 2060 uint32_t factor = 1;
michael@0 2061 uint32_t diff = htcp_cong_time(ca);
michael@0 2062
michael@0 2063 if (diff > (uint32_t)hz) {
michael@0 2064 diff -= hz;
michael@0 2065 factor = 1+ ( 10*diff + ((diff/2)*(diff/2)/hz))/hz;
michael@0 2066 }
michael@0 2067
michael@0 2068 if (use_rtt_scaling && minRTT) {
michael@0 2069 uint32_t scale = (hz<<3)/(10*minRTT);
michael@0 2070 scale = min(max(scale, 1U<<2), 10U<<3); /* clamping ratio to interval [0.5,10]<<3 */
michael@0 2071 factor = (factor<<3)/scale;
michael@0 2072 if (!factor)
michael@0 2073 factor = 1;
michael@0 2074 }
michael@0 2075
michael@0 2076 ca->alpha = 2*factor*((1<<7)-ca->beta);
michael@0 2077 if (!ca->alpha)
michael@0 2078 ca->alpha = ALPHA_BASE;
michael@0 2079 }
michael@0 2080
michael@0 2081 /* After we have the rtt data to calculate beta, we'd still prefer to wait one
michael@0 2082 * rtt before we adjust our beta to ensure we are working from a consistent
michael@0 2083 * data.
michael@0 2084 *
michael@0 2085 * This function should be called when we hit a congestion event since only at
michael@0 2086 * that point do we really have a real sense of maxRTT (the queues en route
michael@0 2087 * were getting just too full now).
michael@0 2088 */
michael@0 2089 static void
michael@0 2090 htcp_param_update(struct sctp_nets *net)
michael@0 2091 {
michael@0 2092 uint32_t minRTT = net->cc_mod.htcp_ca.minRTT;
michael@0 2093 uint32_t maxRTT = net->cc_mod.htcp_ca.maxRTT;
michael@0 2094
michael@0 2095 htcp_beta_update(&net->cc_mod.htcp_ca, minRTT, maxRTT);
michael@0 2096 htcp_alpha_update(&net->cc_mod.htcp_ca);
michael@0 2097
michael@0 2098 /* add slowly fading memory for maxRTT to accommodate routing changes etc */
michael@0 2099 if (minRTT > 0 && maxRTT > minRTT)
michael@0 2100 net->cc_mod.htcp_ca.maxRTT = minRTT + ((maxRTT-minRTT)*95)/100;
michael@0 2101 }
michael@0 2102
michael@0 2103 static uint32_t
michael@0 2104 htcp_recalc_ssthresh(struct sctp_nets *net)
michael@0 2105 {
michael@0 2106 htcp_param_update(net);
michael@0 2107 return (max(((net->cwnd/net->mtu * net->cc_mod.htcp_ca.beta) >> 7)*net->mtu, 2U*net->mtu));
michael@0 2108 }
michael@0 2109
michael@0 2110 static void
michael@0 2111 htcp_cong_avoid(struct sctp_tcb *stcb, struct sctp_nets *net)
michael@0 2112 {
michael@0 2113 /*-
michael@0 2114 * How to handle these functions?
michael@0 2115 * if (!tcp_is_cwnd_limited(sk, in_flight)) RRS - good question.
michael@0 2116 * return;
michael@0 2117 */
michael@0 2118 if (net->cwnd <= net->ssthresh) {
michael@0 2119 /* We are in slow start */
michael@0 2120 if (net->flight_size + net->net_ack >= net->cwnd) {
michael@0 2121 if (net->net_ack > (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable))) {
michael@0 2122 net->cwnd += (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable));
michael@0 2123 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 2124 sctp_log_cwnd(stcb, net, net->mtu,
michael@0 2125 SCTP_CWND_LOG_FROM_SS);
michael@0 2126 }
michael@0 2127
michael@0 2128 } else {
michael@0 2129 net->cwnd += net->net_ack;
michael@0 2130 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 2131 sctp_log_cwnd(stcb, net, net->net_ack,
michael@0 2132 SCTP_CWND_LOG_FROM_SS);
michael@0 2133 }
michael@0 2134
michael@0 2135 }
michael@0 2136 } else {
michael@0 2137 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
michael@0 2138 sctp_log_cwnd(stcb, net, net->net_ack,
michael@0 2139 SCTP_CWND_LOG_NOADV_SS);
michael@0 2140 }
michael@0 2141 }
michael@0 2142 } else {
michael@0 2143 measure_rtt(net);
michael@0 2144
michael@0 2145 /* In dangerous area, increase slowly.
michael@0 2146 * In theory this is net->cwnd += alpha / net->cwnd
michael@0 2147 */
michael@0 2148 /* What is snd_cwnd_cnt?? */
michael@0 2149 if (((net->partial_bytes_acked/net->mtu * net->cc_mod.htcp_ca.alpha) >> 7)*net->mtu >= net->cwnd) {
michael@0 2150 /*-
michael@0 2151 * Does SCTP have a cwnd clamp?
michael@0 2152 * if (net->snd_cwnd < net->snd_cwnd_clamp) - Nope (RRS).
michael@0 2153 */
michael@0 2154 net->cwnd += net->mtu;
michael@0 2155 net->partial_bytes_acked = 0;
michael@0 2156 htcp_alpha_update(&net->cc_mod.htcp_ca);
michael@0 2157 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 2158 sctp_log_cwnd(stcb, net, net->mtu,
michael@0 2159 SCTP_CWND_LOG_FROM_CA);
michael@0 2160 }
michael@0 2161 } else {
michael@0 2162 net->partial_bytes_acked += net->net_ack;
michael@0 2163 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
michael@0 2164 sctp_log_cwnd(stcb, net, net->net_ack,
michael@0 2165 SCTP_CWND_LOG_NOADV_CA);
michael@0 2166 }
michael@0 2167 }
michael@0 2168
michael@0 2169 net->cc_mod.htcp_ca.bytes_acked = net->mtu;
michael@0 2170 }
michael@0 2171 }
michael@0 2172
michael@0 2173 #ifdef SCTP_NOT_USED
michael@0 2174 /* Lower bound on congestion window. */
michael@0 2175 static uint32_t
michael@0 2176 htcp_min_cwnd(struct sctp_tcb *stcb, struct sctp_nets *net)
michael@0 2177 {
michael@0 2178 return (net->ssthresh);
michael@0 2179 }
michael@0 2180 #endif
michael@0 2181
michael@0 2182 static void
michael@0 2183 htcp_init(struct sctp_nets *net)
michael@0 2184 {
michael@0 2185 memset(&net->cc_mod.htcp_ca, 0, sizeof(struct htcp));
michael@0 2186 net->cc_mod.htcp_ca.alpha = ALPHA_BASE;
michael@0 2187 net->cc_mod.htcp_ca.beta = BETA_MIN;
michael@0 2188 net->cc_mod.htcp_ca.bytes_acked = net->mtu;
michael@0 2189 net->cc_mod.htcp_ca.last_cong = sctp_get_tick_count();
michael@0 2190 }
michael@0 2191
michael@0 2192 static void
michael@0 2193 sctp_htcp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net)
michael@0 2194 {
michael@0 2195 /*
michael@0 2196 * We take the max of the burst limit times a MTU or the
michael@0 2197 * INITIAL_CWND. We then limit this to 4 MTU's of sending.
michael@0 2198 */
michael@0 2199 net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND));
michael@0 2200 net->ssthresh = stcb->asoc.peers_rwnd;
michael@0 2201 htcp_init(net);
michael@0 2202
michael@0 2203 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE|SCTP_CWND_LOGGING_ENABLE)) {
michael@0 2204 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_INITIALIZATION);
michael@0 2205 }
michael@0 2206 }
michael@0 2207
michael@0 2208 static void
michael@0 2209 sctp_htcp_cwnd_update_after_sack(struct sctp_tcb *stcb,
michael@0 2210 struct sctp_association *asoc,
michael@0 2211 int accum_moved, int reneged_all SCTP_UNUSED, int will_exit)
michael@0 2212 {
michael@0 2213 struct sctp_nets *net;
michael@0 2214
michael@0 2215 /******************************/
michael@0 2216 /* update cwnd and Early FR */
michael@0 2217 /******************************/
michael@0 2218 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
michael@0 2219
michael@0 2220 #ifdef JANA_CMT_FAST_RECOVERY
michael@0 2221 /*
michael@0 2222 * CMT fast recovery code. Need to debug.
michael@0 2223 */
michael@0 2224 if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) {
michael@0 2225 if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) ||
michael@0 2226 SCTP_TSN_GE(net->pseudo_cumack,net->fast_recovery_tsn)) {
michael@0 2227 net->will_exit_fast_recovery = 1;
michael@0 2228 }
michael@0 2229 }
michael@0 2230 #endif
michael@0 2231 /* if nothing was acked on this destination skip it */
michael@0 2232 if (net->net_ack == 0) {
michael@0 2233 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
michael@0 2234 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK);
michael@0 2235 }
michael@0 2236 continue;
michael@0 2237 }
michael@0 2238 #ifdef JANA_CMT_FAST_RECOVERY
michael@0 2239 /* CMT fast recovery code
michael@0 2240 */
michael@0 2241 /*
michael@0 2242 if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery && net->will_exit_fast_recovery == 0) {
michael@0 2243 @@@ Do something
michael@0 2244 }
michael@0 2245 else if (sctp_cmt_on_off == 0 && asoc->fast_retran_loss_recovery && will_exit == 0) {
michael@0 2246 */
michael@0 2247 #endif
michael@0 2248
michael@0 2249 if (asoc->fast_retran_loss_recovery &&
michael@0 2250 will_exit == 0 &&
michael@0 2251 (asoc->sctp_cmt_on_off == 0)) {
michael@0 2252 /*
michael@0 2253 * If we are in loss recovery we skip any cwnd
michael@0 2254 * update
michael@0 2255 */
michael@0 2256 return;
michael@0 2257 }
michael@0 2258 /*
michael@0 2259 * CMT: CUC algorithm. Update cwnd if pseudo-cumack has
michael@0 2260 * moved.
michael@0 2261 */
michael@0 2262 if (accum_moved ||
michael@0 2263 ((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) {
michael@0 2264 htcp_cong_avoid(stcb, net);
michael@0 2265 measure_achieved_throughput(net);
michael@0 2266 } else {
michael@0 2267 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
michael@0 2268 sctp_log_cwnd(stcb, net, net->mtu,
michael@0 2269 SCTP_CWND_LOG_NO_CUMACK);
michael@0 2270 }
michael@0 2271 }
michael@0 2272 }
michael@0 2273 }
michael@0 2274
michael@0 2275 static void
michael@0 2276 sctp_htcp_cwnd_update_after_fr(struct sctp_tcb *stcb,
michael@0 2277 struct sctp_association *asoc)
michael@0 2278 {
michael@0 2279 struct sctp_nets *net;
michael@0 2280 /*
michael@0 2281 * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) &&
michael@0 2282 * (net->fast_retran_loss_recovery == 0)))
michael@0 2283 */
michael@0 2284 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
michael@0 2285 if ((asoc->fast_retran_loss_recovery == 0) ||
michael@0 2286 (asoc->sctp_cmt_on_off > 0)) {
michael@0 2287 /* out of a RFC2582 Fast recovery window? */
michael@0 2288 if (net->net_ack > 0) {
michael@0 2289 /*
michael@0 2290 * per section 7.2.3, are there any
michael@0 2291 * destinations that had a fast retransmit
michael@0 2292 * to them. If so what we need to do is
michael@0 2293 * adjust ssthresh and cwnd.
michael@0 2294 */
michael@0 2295 struct sctp_tmit_chunk *lchk;
michael@0 2296 int old_cwnd = net->cwnd;
michael@0 2297
michael@0 2298 /* JRS - reset as if state were changed */
michael@0 2299 htcp_reset(&net->cc_mod.htcp_ca);
michael@0 2300 net->ssthresh = htcp_recalc_ssthresh(net);
michael@0 2301 net->cwnd = net->ssthresh;
michael@0 2302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 2303 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd),
michael@0 2304 SCTP_CWND_LOG_FROM_FR);
michael@0 2305 }
michael@0 2306 lchk = TAILQ_FIRST(&asoc->send_queue);
michael@0 2307
michael@0 2308 net->partial_bytes_acked = 0;
michael@0 2309 /* Turn on fast recovery window */
michael@0 2310 asoc->fast_retran_loss_recovery = 1;
michael@0 2311 if (lchk == NULL) {
michael@0 2312 /* Mark end of the window */
michael@0 2313 asoc->fast_recovery_tsn = asoc->sending_seq - 1;
michael@0 2314 } else {
michael@0 2315 asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1;
michael@0 2316 }
michael@0 2317
michael@0 2318 /*
michael@0 2319 * CMT fast recovery -- per destination
michael@0 2320 * recovery variable.
michael@0 2321 */
michael@0 2322 net->fast_retran_loss_recovery = 1;
michael@0 2323
michael@0 2324 if (lchk == NULL) {
michael@0 2325 /* Mark end of the window */
michael@0 2326 net->fast_recovery_tsn = asoc->sending_seq - 1;
michael@0 2327 } else {
michael@0 2328 net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1;
michael@0 2329 }
michael@0 2330
michael@0 2331 sctp_timer_stop(SCTP_TIMER_TYPE_SEND,
michael@0 2332 stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA+SCTP_LOC_32);
michael@0 2333 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
michael@0 2334 stcb->sctp_ep, stcb, net);
michael@0 2335 }
michael@0 2336 } else if (net->net_ack > 0) {
michael@0 2337 /*
michael@0 2338 * Mark a peg that we WOULD have done a cwnd
michael@0 2339 * reduction but RFC2582 prevented this action.
michael@0 2340 */
michael@0 2341 SCTP_STAT_INCR(sctps_fastretransinrtt);
michael@0 2342 }
michael@0 2343 }
michael@0 2344 }
michael@0 2345
michael@0 2346 static void
michael@0 2347 sctp_htcp_cwnd_update_after_timeout(struct sctp_tcb *stcb,
michael@0 2348 struct sctp_nets *net)
michael@0 2349 {
michael@0 2350 int old_cwnd = net->cwnd;
michael@0 2351
michael@0 2352 /* JRS - reset as if the state were being changed to timeout */
michael@0 2353 htcp_reset(&net->cc_mod.htcp_ca);
michael@0 2354 net->ssthresh = htcp_recalc_ssthresh(net);
michael@0 2355 net->cwnd = net->mtu;
michael@0 2356 net->partial_bytes_acked = 0;
michael@0 2357 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 2358 sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX);
michael@0 2359 }
michael@0 2360 }
michael@0 2361
michael@0 2362 static void
michael@0 2363 sctp_htcp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb,
michael@0 2364 struct sctp_nets *net, int in_window, int num_pkt_lost SCTP_UNUSED)
michael@0 2365 {
michael@0 2366 int old_cwnd;
michael@0 2367 old_cwnd = net->cwnd;
michael@0 2368
michael@0 2369 /* JRS - reset hctp as if state changed */
michael@0 2370 if (in_window == 0) {
michael@0 2371 htcp_reset(&net->cc_mod.htcp_ca);
michael@0 2372 SCTP_STAT_INCR(sctps_ecnereducedcwnd);
michael@0 2373 net->ssthresh = htcp_recalc_ssthresh(net);
michael@0 2374 if (net->ssthresh < net->mtu) {
michael@0 2375 net->ssthresh = net->mtu;
michael@0 2376 /* here back off the timer as well, to slow us down */
michael@0 2377 net->RTO <<= 1;
michael@0 2378 }
michael@0 2379 net->cwnd = net->ssthresh;
michael@0 2380 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
michael@0 2381 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT);
michael@0 2382 }
michael@0 2383 }
michael@0 2384 }
michael@0 2385
michael@0 2386 struct sctp_cc_functions sctp_cc_functions[] = {
michael@0 2387 {
michael@0 2388 #if defined(__Windows__) || defined(__Userspace_os_Windows)
michael@0 2389 sctp_set_initial_cc_param,
michael@0 2390 sctp_cwnd_update_after_sack,
michael@0 2391 sctp_cwnd_update_exit_pf_common,
michael@0 2392 sctp_cwnd_update_after_fr,
michael@0 2393 sctp_cwnd_update_after_timeout,
michael@0 2394 sctp_cwnd_update_after_ecn_echo,
michael@0 2395 sctp_cwnd_update_after_packet_dropped,
michael@0 2396 sctp_cwnd_update_after_output,
michael@0 2397 #else
michael@0 2398 .sctp_set_initial_cc_param = sctp_set_initial_cc_param,
michael@0 2399 .sctp_cwnd_update_after_sack = sctp_cwnd_update_after_sack,
michael@0 2400 .sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common,
michael@0 2401 .sctp_cwnd_update_after_fr = sctp_cwnd_update_after_fr,
michael@0 2402 .sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout,
michael@0 2403 .sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_after_ecn_echo,
michael@0 2404 .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped,
michael@0 2405 .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output,
michael@0 2406 #endif
michael@0 2407 },
michael@0 2408 {
michael@0 2409 #if defined(__Windows__) || defined(__Userspace_os_Windows)
michael@0 2410 sctp_set_initial_cc_param,
michael@0 2411 sctp_hs_cwnd_update_after_sack,
michael@0 2412 sctp_cwnd_update_exit_pf_common,
michael@0 2413 sctp_hs_cwnd_update_after_fr,
michael@0 2414 sctp_cwnd_update_after_timeout,
michael@0 2415 sctp_cwnd_update_after_ecn_echo,
michael@0 2416 sctp_cwnd_update_after_packet_dropped,
michael@0 2417 sctp_cwnd_update_after_output,
michael@0 2418 #else
michael@0 2419 .sctp_set_initial_cc_param = sctp_set_initial_cc_param,
michael@0 2420 .sctp_cwnd_update_after_sack = sctp_hs_cwnd_update_after_sack,
michael@0 2421 .sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common,
michael@0 2422 .sctp_cwnd_update_after_fr = sctp_hs_cwnd_update_after_fr,
michael@0 2423 .sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout,
michael@0 2424 .sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_after_ecn_echo,
michael@0 2425 .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped,
michael@0 2426 .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output,
michael@0 2427 #endif
michael@0 2428 },
michael@0 2429 {
michael@0 2430 #if defined(__Windows__) || defined(__Userspace_os_Windows)
michael@0 2431 sctp_htcp_set_initial_cc_param,
michael@0 2432 sctp_htcp_cwnd_update_after_sack,
michael@0 2433 sctp_cwnd_update_exit_pf_common,
michael@0 2434 sctp_htcp_cwnd_update_after_fr,
michael@0 2435 sctp_htcp_cwnd_update_after_timeout,
michael@0 2436 sctp_htcp_cwnd_update_after_ecn_echo,
michael@0 2437 sctp_cwnd_update_after_packet_dropped,
michael@0 2438 sctp_cwnd_update_after_output,
michael@0 2439 #else
michael@0 2440 .sctp_set_initial_cc_param = sctp_htcp_set_initial_cc_param,
michael@0 2441 .sctp_cwnd_update_after_sack = sctp_htcp_cwnd_update_after_sack,
michael@0 2442 .sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common,
michael@0 2443 .sctp_cwnd_update_after_fr = sctp_htcp_cwnd_update_after_fr,
michael@0 2444 .sctp_cwnd_update_after_timeout = sctp_htcp_cwnd_update_after_timeout,
michael@0 2445 .sctp_cwnd_update_after_ecn_echo = sctp_htcp_cwnd_update_after_ecn_echo,
michael@0 2446 .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped,
michael@0 2447 .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output,
michael@0 2448 #endif
michael@0 2449 },
michael@0 2450 {
michael@0 2451 #if defined(__Windows__) || defined(__Userspace_os_Windows)
michael@0 2452 sctp_set_rtcc_initial_cc_param,
michael@0 2453 sctp_cwnd_update_rtcc_after_sack,
michael@0 2454 sctp_cwnd_update_exit_pf_common,
michael@0 2455 sctp_cwnd_update_after_fr,
michael@0 2456 sctp_cwnd_update_after_timeout,
michael@0 2457 sctp_cwnd_update_rtcc_after_ecn_echo,
michael@0 2458 sctp_cwnd_update_after_packet_dropped,
michael@0 2459 sctp_cwnd_update_after_output,
michael@0 2460 sctp_cwnd_update_rtcc_packet_transmitted,
michael@0 2461 sctp_cwnd_update_rtcc_tsn_acknowledged,
michael@0 2462 sctp_cwnd_new_rtcc_transmission_begins,
michael@0 2463 sctp_cwnd_prepare_rtcc_net_for_sack,
michael@0 2464 sctp_cwnd_rtcc_socket_option,
michael@0 2465 sctp_rtt_rtcc_calculated
michael@0 2466 #else
michael@0 2467 .sctp_set_initial_cc_param = sctp_set_rtcc_initial_cc_param,
michael@0 2468 .sctp_cwnd_update_after_sack = sctp_cwnd_update_rtcc_after_sack,
michael@0 2469 .sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common,
michael@0 2470 .sctp_cwnd_update_after_fr = sctp_cwnd_update_after_fr,
michael@0 2471 .sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout,
michael@0 2472 .sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_rtcc_after_ecn_echo,
michael@0 2473 .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped,
michael@0 2474 .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output,
michael@0 2475 .sctp_cwnd_update_packet_transmitted = sctp_cwnd_update_rtcc_packet_transmitted,
michael@0 2476 .sctp_cwnd_update_tsn_acknowledged = sctp_cwnd_update_rtcc_tsn_acknowledged,
michael@0 2477 .sctp_cwnd_new_transmission_begins = sctp_cwnd_new_rtcc_transmission_begins,
michael@0 2478 .sctp_cwnd_prepare_net_for_sack = sctp_cwnd_prepare_rtcc_net_for_sack,
michael@0 2479 .sctp_cwnd_socket_option = sctp_cwnd_rtcc_socket_option,
michael@0 2480 .sctp_rtt_calculated = sctp_rtt_rtcc_calculated
michael@0 2481 #endif
michael@0 2482 }
michael@0 2483 };

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