sctp_cc_functions.c revision 218232
1/*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2011, by Randall Stewart, rrs@lakerest.net and 4 * Michael Tuexen, tuexen@fh-muenster.de 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * 10 * a) Redistributions of source code must retain the above copyright notice, 11 * this list of conditions and the following disclaimer. 12 * 13 * b) Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the distribution. 16 * 17 * c) Neither the name of Cisco Systems, Inc. nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 31 * THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34#include <netinet/sctp_os.h> 35#include <netinet/sctp_var.h> 36#include <netinet/sctp_sysctl.h> 37#include <netinet/sctp_pcb.h> 38#include <netinet/sctp_header.h> 39#include <netinet/sctputil.h> 40#include <netinet/sctp_output.h> 41#include <netinet/sctp_input.h> 42#include <netinet/sctp_indata.h> 43#include <netinet/sctp_uio.h> 44#include <netinet/sctp_timer.h> 45#include <netinet/sctp_auth.h> 46#include <netinet/sctp_asconf.h> 47#include <netinet/sctp_dtrace_declare.h> 48#include <sys/cdefs.h> 49__FBSDID("$FreeBSD: head/sys/netinet/sctp_cc_functions.c 218232 2011-02-03 19:22:21Z rrs $"); 50 51static void 52sctp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net) 53{ 54 struct sctp_association *assoc; 55 uint32_t cwnd_in_mtu; 56 57 assoc = &stcb->asoc; 58 cwnd_in_mtu = SCTP_BASE_SYSCTL(sctp_initial_cwnd); 59 if (cwnd_in_mtu == 0) { 60 /* Using 0 means that the value of RFC 4960 is used. */ 61 net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND)); 62 } else { 63 /* 64 * We take the minimum of the burst limit and the initial 65 * congestion window. 66 */ 67 if ((assoc->max_burst > 0) && (cwnd_in_mtu > assoc->max_burst)) 68 cwnd_in_mtu = assoc->max_burst; 69 net->cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu; 70 } 71 if (stcb->asoc.sctp_cmt_on_off == 2) { 72 /* In case of resource pooling initialize appropriately */ 73 net->cwnd /= assoc->numnets; 74 if (net->cwnd < (net->mtu - sizeof(struct sctphdr))) { 75 net->cwnd = net->mtu - sizeof(struct sctphdr); 76 } 77 } 78 net->ssthresh = assoc->peers_rwnd; 79 80 SDT_PROBE(sctp, cwnd, net, init, 81 stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net, 82 0, net->cwnd); 83 if (SCTP_BASE_SYSCTL(sctp_logging_level) & 84 (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 85 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_INITIALIZATION); 86 } 87} 88 89static void 90sctp_cwnd_update_after_fr(struct sctp_tcb *stcb, 91 struct sctp_association *asoc) 92{ 93 struct sctp_nets *net; 94 uint32_t t_ssthresh, t_cwnd; 95 96 /* MT FIXME: Don't compute this over and over again */ 97 t_ssthresh = 0; 98 t_cwnd = 0; 99 if (asoc->sctp_cmt_on_off == 2) { 100 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 101 t_ssthresh += net->ssthresh; 102 t_cwnd += net->cwnd; 103 } 104 } 105 /*- 106 * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) && 107 * (net->fast_retran_loss_recovery == 0))) 108 */ 109 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 110 if ((asoc->fast_retran_loss_recovery == 0) || 111 (asoc->sctp_cmt_on_off > 0)) { 112 /* out of a RFC2582 Fast recovery window? */ 113 if (net->net_ack > 0) { 114 /* 115 * per section 7.2.3, are there any 116 * destinations that had a fast retransmit 117 * to them. If so what we need to do is 118 * adjust ssthresh and cwnd. 119 */ 120 struct sctp_tmit_chunk *lchk; 121 int old_cwnd = net->cwnd; 122 123 if (asoc->sctp_cmt_on_off == 2) { 124 net->ssthresh = (uint32_t) (((uint64_t) 4 * 125 (uint64_t) net->mtu * 126 (uint64_t) net->ssthresh) / 127 (uint64_t) t_ssthresh); 128 if ((net->cwnd > t_cwnd / 2) && 129 (net->ssthresh < net->cwnd - t_cwnd / 2)) { 130 net->ssthresh = net->cwnd - t_cwnd / 2; 131 } 132 if (net->ssthresh < net->mtu) { 133 net->ssthresh = net->mtu; 134 } 135 } else { 136 net->ssthresh = net->cwnd / 2; 137 if (net->ssthresh < (net->mtu * 2)) { 138 net->ssthresh = 2 * net->mtu; 139 } 140 } 141 net->cwnd = net->ssthresh; 142 SDT_PROBE(sctp, cwnd, net, fr, 143 stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net, 144 old_cwnd, net->cwnd); 145 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 146 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), 147 SCTP_CWND_LOG_FROM_FR); 148 } 149 lchk = TAILQ_FIRST(&asoc->send_queue); 150 151 net->partial_bytes_acked = 0; 152 /* Turn on fast recovery window */ 153 asoc->fast_retran_loss_recovery = 1; 154 if (lchk == NULL) { 155 /* Mark end of the window */ 156 asoc->fast_recovery_tsn = asoc->sending_seq - 1; 157 } else { 158 asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; 159 } 160 161 /* 162 * CMT fast recovery -- per destination 163 * recovery variable. 164 */ 165 net->fast_retran_loss_recovery = 1; 166 167 if (lchk == NULL) { 168 /* Mark end of the window */ 169 net->fast_recovery_tsn = asoc->sending_seq - 1; 170 } else { 171 net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; 172 } 173 174 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, 175 stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_32); 176 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 177 stcb->sctp_ep, stcb, net); 178 } 179 } else if (net->net_ack > 0) { 180 /* 181 * Mark a peg that we WOULD have done a cwnd 182 * reduction but RFC2582 prevented this action. 183 */ 184 SCTP_STAT_INCR(sctps_fastretransinrtt); 185 } 186 } 187} 188 189static void 190sctp_cwnd_update_after_sack(struct sctp_tcb *stcb, 191 struct sctp_association *asoc, 192 int accum_moved, int reneged_all, int will_exit) 193{ 194 struct sctp_nets *net; 195 int old_cwnd; 196 uint32_t t_ssthresh, t_cwnd, incr; 197 198 /* MT FIXME: Don't compute this over and over again */ 199 t_ssthresh = 0; 200 t_cwnd = 0; 201 if (stcb->asoc.sctp_cmt_on_off == 2) { 202 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 203 t_ssthresh += net->ssthresh; 204 t_cwnd += net->cwnd; 205 } 206 } 207 /******************************/ 208 /* update cwnd and Early FR */ 209 /******************************/ 210 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 211 212#ifdef JANA_CMT_FAST_RECOVERY 213 /* 214 * CMT fast recovery code. Need to debug. 215 */ 216 if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) { 217 if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) || 218 SCTP_TSN_GE(net->pseudo_cumack, net->fast_recovery_tsn)) { 219 net->will_exit_fast_recovery = 1; 220 } 221 } 222#endif 223 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 224 /* 225 * So, first of all do we need to have a Early FR 226 * timer running? 227 */ 228 if ((!TAILQ_EMPTY(&asoc->sent_queue) && 229 (net->ref_count > 1) && 230 (net->flight_size < net->cwnd)) || 231 (reneged_all)) { 232 /* 233 * yes, so in this case stop it if its 234 * running, and then restart it. Reneging 235 * all is a special case where we want to 236 * run the Early FR timer and then force the 237 * last few unacked to be sent, causing us 238 * to illicit a sack with gaps to force out 239 * the others. 240 */ 241 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 242 SCTP_STAT_INCR(sctps_earlyfrstpidsck2); 243 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 244 SCTP_FROM_SCTP_INDATA + SCTP_LOC_20); 245 } 246 SCTP_STAT_INCR(sctps_earlyfrstrid); 247 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net); 248 } else { 249 /* No, stop it if its running */ 250 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 251 SCTP_STAT_INCR(sctps_earlyfrstpidsck3); 252 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 253 SCTP_FROM_SCTP_INDATA + SCTP_LOC_21); 254 } 255 } 256 } 257 /* if nothing was acked on this destination skip it */ 258 if (net->net_ack == 0) { 259 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 260 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK); 261 } 262 continue; 263 } 264 if (net->net_ack2 > 0) { 265 /* 266 * Karn's rule applies to clearing error count, this 267 * is optional. 268 */ 269 net->error_count = 0; 270 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) == 271 SCTP_ADDR_NOT_REACHABLE) { 272 /* addr came good */ 273 net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 274 net->dest_state |= SCTP_ADDR_REACHABLE; 275 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 276 SCTP_RECEIVED_SACK, (void *)net, SCTP_SO_NOT_LOCKED); 277 /* now was it the primary? if so restore */ 278 if (net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 279 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, net); 280 } 281 } 282 /* 283 * JRS 5/14/07 - If CMT PF is on and the destination 284 * is in PF state, set the destination to active 285 * state and set the cwnd to one or two MTU's based 286 * on whether PF1 or PF2 is being used. 287 * 288 * Should we stop any running T3 timer here? 289 */ 290 if ((asoc->sctp_cmt_on_off > 0) && 291 (asoc->sctp_cmt_pf > 0) && 292 ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) { 293 net->dest_state &= ~SCTP_ADDR_PF; 294 old_cwnd = net->cwnd; 295 net->cwnd = net->mtu * asoc->sctp_cmt_pf; 296 SDT_PROBE(sctp, cwnd, net, ack, 297 stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net, 298 old_cwnd, net->cwnd); 299 SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n", 300 net, net->cwnd); 301 /* 302 * Since the cwnd value is explicitly set, 303 * skip the code that updates the cwnd 304 * value. 305 */ 306 goto skip_cwnd_update; 307 } 308 } 309#ifdef JANA_CMT_FAST_RECOVERY 310 /* 311 * CMT fast recovery code 312 */ 313 /* 314 * if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery 315 * && net->will_exit_fast_recovery == 0) { @@@ Do something 316 * } else if (sctp_cmt_on_off == 0 && 317 * asoc->fast_retran_loss_recovery && will_exit == 0) { 318 */ 319#endif 320 321 if (asoc->fast_retran_loss_recovery && 322 (will_exit == 0) && 323 (asoc->sctp_cmt_on_off == 0)) { 324 /* 325 * If we are in loss recovery we skip any cwnd 326 * update 327 */ 328 goto skip_cwnd_update; 329 } 330 /* 331 * CMT: CUC algorithm. Update cwnd if pseudo-cumack has 332 * moved. 333 */ 334 if (accum_moved || 335 ((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) { 336 /* If the cumulative ack moved we can proceed */ 337 if (net->cwnd <= net->ssthresh) { 338 /* We are in slow start */ 339 if (net->flight_size + net->net_ack >= net->cwnd) { 340 old_cwnd = net->cwnd; 341 if (stcb->asoc.sctp_cmt_on_off == 2) { 342 uint32_t limit; 343 344 limit = (uint32_t) (((uint64_t) net->mtu * 345 (uint64_t) SCTP_BASE_SYSCTL(sctp_L2_abc_variable) * 346 (uint64_t) net->ssthresh) / 347 (uint64_t) t_ssthresh); 348 incr = (uint32_t) (((uint64_t) net->net_ack * 349 (uint64_t) net->ssthresh) / 350 (uint64_t) t_ssthresh); 351 if (incr > limit) { 352 incr = limit; 353 } 354 if (incr == 0) { 355 incr = 1; 356 } 357 } else { 358 incr = net->net_ack; 359 if (incr > net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable)) { 360 incr = net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable); 361 } 362 } 363 net->cwnd += incr; 364 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 365 sctp_log_cwnd(stcb, net, incr, 366 SCTP_CWND_LOG_FROM_SS); 367 } 368 SDT_PROBE(sctp, cwnd, net, ack, 369 stcb->asoc.my_vtag, 370 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 371 net, 372 old_cwnd, net->cwnd); 373 } else { 374 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 375 sctp_log_cwnd(stcb, net, net->net_ack, 376 SCTP_CWND_LOG_NOADV_SS); 377 } 378 } 379 } else { 380 /* We are in congestion avoidance */ 381 /* 382 * Add to pba 383 */ 384 net->partial_bytes_acked += net->net_ack; 385 386 if ((net->flight_size + net->net_ack >= net->cwnd) && 387 (net->partial_bytes_acked >= net->cwnd)) { 388 net->partial_bytes_acked -= net->cwnd; 389 old_cwnd = net->cwnd; 390 if (asoc->sctp_cmt_on_off == 2) { 391 incr = (uint32_t) (((uint64_t) net->mtu * 392 (uint64_t) net->ssthresh) / 393 (uint64_t) t_ssthresh); 394 if (incr == 0) { 395 incr = 1; 396 } 397 } else { 398 incr = net->mtu; 399 } 400 net->cwnd += incr; 401 SDT_PROBE(sctp, cwnd, net, ack, 402 stcb->asoc.my_vtag, 403 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 404 net, 405 old_cwnd, net->cwnd); 406 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 407 sctp_log_cwnd(stcb, net, net->mtu, 408 SCTP_CWND_LOG_FROM_CA); 409 } 410 } else { 411 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 412 sctp_log_cwnd(stcb, net, net->net_ack, 413 SCTP_CWND_LOG_NOADV_CA); 414 } 415 } 416 } 417 } else { 418 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 419 sctp_log_cwnd(stcb, net, net->mtu, 420 SCTP_CWND_LOG_NO_CUMACK); 421 } 422 } 423skip_cwnd_update: 424 /* 425 * NOW, according to Karn's rule do we need to restore the 426 * RTO timer back? Check our net_ack2. If not set then we 427 * have a ambiguity.. i.e. all data ack'd was sent to more 428 * than one place. 429 */ 430 if (net->net_ack2) { 431 /* restore any doubled timers */ 432 net->RTO = ((net->lastsa >> 2) + net->lastsv) >> 1; 433 if (net->RTO < stcb->asoc.minrto) { 434 net->RTO = stcb->asoc.minrto; 435 } 436 if (net->RTO > stcb->asoc.maxrto) { 437 net->RTO = stcb->asoc.maxrto; 438 } 439 } 440 } 441} 442 443static void 444sctp_cwnd_update_after_timeout(struct sctp_tcb *stcb, struct sctp_nets *net) 445{ 446 int old_cwnd = net->cwnd; 447 uint32_t t_ssthresh, t_cwnd; 448 449 /* MT FIXME: Don't compute this over and over again */ 450 t_ssthresh = 0; 451 t_cwnd = 0; 452 if (stcb->asoc.sctp_cmt_on_off == 2) { 453 struct sctp_nets *lnet; 454 455 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) { 456 t_ssthresh += lnet->ssthresh; 457 t_cwnd += lnet->cwnd; 458 } 459 net->ssthresh = (uint32_t) (((uint64_t) 4 * 460 (uint64_t) net->mtu * 461 (uint64_t) net->ssthresh) / 462 (uint64_t) t_ssthresh); 463 if ((net->cwnd > t_cwnd / 2) && 464 (net->ssthresh < net->cwnd - t_cwnd / 2)) { 465 net->ssthresh = net->cwnd - t_cwnd / 2; 466 } 467 if (net->ssthresh < net->mtu) { 468 net->ssthresh = net->mtu; 469 } 470 } else { 471 net->ssthresh = max(net->cwnd / 2, 4 * net->mtu); 472 } 473 net->cwnd = net->mtu; 474 net->partial_bytes_acked = 0; 475 SDT_PROBE(sctp, cwnd, net, to, 476 stcb->asoc.my_vtag, 477 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 478 net, 479 old_cwnd, net->cwnd); 480 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 481 sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX); 482 } 483} 484 485 486static void 487sctp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net, 488 int in_window, int num_pkt_lost) 489{ 490 int old_cwnd = net->cwnd; 491 492 if (in_window == 0) { 493 SCTP_STAT_INCR(sctps_ecnereducedcwnd); 494 net->ssthresh = net->cwnd / 2; 495 if (net->ssthresh < net->mtu) { 496 net->ssthresh = net->mtu; 497 /* here back off the timer as well, to slow us down */ 498 net->RTO <<= 1; 499 } 500 net->cwnd = net->ssthresh; 501 SDT_PROBE(sctp, cwnd, net, ecn, 502 stcb->asoc.my_vtag, 503 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 504 net, 505 old_cwnd, net->cwnd); 506 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 507 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); 508 } 509 } 510} 511 512static void 513sctp_cwnd_update_after_packet_dropped(struct sctp_tcb *stcb, 514 struct sctp_nets *net, struct sctp_pktdrop_chunk *cp, 515 uint32_t * bottle_bw, uint32_t * on_queue) 516{ 517 uint32_t bw_avail; 518 int rtt; 519 unsigned int incr; 520 int old_cwnd = net->cwnd; 521 522 /* need real RTT for this calc */ 523 rtt = ((net->lastsa >> 2) + net->lastsv) >> 1; 524 /* get bottle neck bw */ 525 *bottle_bw = ntohl(cp->bottle_bw); 526 /* and whats on queue */ 527 *on_queue = ntohl(cp->current_onq); 528 /* 529 * adjust the on-queue if our flight is more it could be that the 530 * router has not yet gotten data "in-flight" to it 531 */ 532 if (*on_queue < net->flight_size) 533 *on_queue = net->flight_size; 534 /* calculate the available space */ 535 bw_avail = (*bottle_bw * rtt) / 1000; 536 if (bw_avail > *bottle_bw) { 537 /* 538 * Cap the growth to no more than the bottle neck. This can 539 * happen as RTT slides up due to queues. It also means if 540 * you have more than a 1 second RTT with a empty queue you 541 * will be limited to the bottle_bw per second no matter if 542 * other points have 1/2 the RTT and you could get more 543 * out... 544 */ 545 bw_avail = *bottle_bw; 546 } 547 if (*on_queue > bw_avail) { 548 /* 549 * No room for anything else don't allow anything else to be 550 * "added to the fire". 551 */ 552 int seg_inflight, seg_onqueue, my_portion; 553 554 net->partial_bytes_acked = 0; 555 556 /* how much are we over queue size? */ 557 incr = *on_queue - bw_avail; 558 if (stcb->asoc.seen_a_sack_this_pkt) { 559 /* 560 * undo any cwnd adjustment that the sack might have 561 * made 562 */ 563 net->cwnd = net->prev_cwnd; 564 } 565 /* Now how much of that is mine? */ 566 seg_inflight = net->flight_size / net->mtu; 567 seg_onqueue = *on_queue / net->mtu; 568 my_portion = (incr * seg_inflight) / seg_onqueue; 569 570 /* Have I made an adjustment already */ 571 if (net->cwnd > net->flight_size) { 572 /* 573 * for this flight I made an adjustment we need to 574 * decrease the portion by a share our previous 575 * adjustment. 576 */ 577 int diff_adj; 578 579 diff_adj = net->cwnd - net->flight_size; 580 if (diff_adj > my_portion) 581 my_portion = 0; 582 else 583 my_portion -= diff_adj; 584 } 585 /* 586 * back down to the previous cwnd (assume we have had a sack 587 * before this packet). minus what ever portion of the 588 * overage is my fault. 589 */ 590 net->cwnd -= my_portion; 591 592 /* we will NOT back down more than 1 MTU */ 593 if (net->cwnd <= net->mtu) { 594 net->cwnd = net->mtu; 595 } 596 /* force into CA */ 597 net->ssthresh = net->cwnd - 1; 598 } else { 599 /* 600 * Take 1/4 of the space left or max burst up .. whichever 601 * is less. 602 */ 603 incr = (bw_avail - *on_queue) >> 2; 604 if ((stcb->asoc.max_burst > 0) && 605 (stcb->asoc.max_burst * net->mtu < incr)) { 606 incr = stcb->asoc.max_burst * net->mtu; 607 } 608 net->cwnd += incr; 609 } 610 if (net->cwnd > bw_avail) { 611 /* We can't exceed the pipe size */ 612 net->cwnd = bw_avail; 613 } 614 if (net->cwnd < net->mtu) { 615 /* We always have 1 MTU */ 616 net->cwnd = net->mtu; 617 } 618 if (net->cwnd - old_cwnd != 0) { 619 /* log only changes */ 620 SDT_PROBE(sctp, cwnd, net, pd, 621 stcb->asoc.my_vtag, 622 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 623 net, 624 old_cwnd, net->cwnd); 625 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 626 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), 627 SCTP_CWND_LOG_FROM_SAT); 628 } 629 } 630} 631 632static void 633sctp_cwnd_update_after_output(struct sctp_tcb *stcb, 634 struct sctp_nets *net, int burst_limit) 635{ 636 int old_cwnd = net->cwnd; 637 638 if (net->ssthresh < net->cwnd) 639 net->ssthresh = net->cwnd; 640 net->cwnd = (net->flight_size + (burst_limit * net->mtu)); 641 SDT_PROBE(sctp, cwnd, net, bl, 642 stcb->asoc.my_vtag, 643 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 644 net, 645 old_cwnd, net->cwnd); 646 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 647 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_BRST); 648 } 649} 650 651static void 652sctp_cwnd_update_after_fr_timer(struct sctp_inpcb *inp, 653 struct sctp_tcb *stcb, struct sctp_nets *net) 654{ 655 int old_cwnd = net->cwnd; 656 657 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_EARLY_FR_TMR, SCTP_SO_NOT_LOCKED); 658 /* 659 * make a small adjustment to cwnd and force to CA. 660 */ 661 if (net->cwnd > net->mtu) 662 /* drop down one MTU after sending */ 663 net->cwnd -= net->mtu; 664 if (net->cwnd < net->ssthresh) 665 /* still in SS move to CA */ 666 net->ssthresh = net->cwnd - 1; 667 SDT_PROBE(sctp, cwnd, net, fr, 668 stcb->asoc.my_vtag, 669 ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), 670 net, 671 old_cwnd, net->cwnd); 672 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 673 sctp_log_cwnd(stcb, net, (old_cwnd - net->cwnd), SCTP_CWND_LOG_FROM_FR); 674 } 675} 676 677struct sctp_hs_raise_drop { 678 int32_t cwnd; 679 int32_t increase; 680 int32_t drop_percent; 681}; 682 683#define SCTP_HS_TABLE_SIZE 73 684 685struct sctp_hs_raise_drop sctp_cwnd_adjust[SCTP_HS_TABLE_SIZE] = { 686 {38, 1, 50}, /* 0 */ 687 {118, 2, 44}, /* 1 */ 688 {221, 3, 41}, /* 2 */ 689 {347, 4, 38}, /* 3 */ 690 {495, 5, 37}, /* 4 */ 691 {663, 6, 35}, /* 5 */ 692 {851, 7, 34}, /* 6 */ 693 {1058, 8, 33}, /* 7 */ 694 {1284, 9, 32}, /* 8 */ 695 {1529, 10, 31}, /* 9 */ 696 {1793, 11, 30}, /* 10 */ 697 {2076, 12, 29}, /* 11 */ 698 {2378, 13, 28}, /* 12 */ 699 {2699, 14, 28}, /* 13 */ 700 {3039, 15, 27}, /* 14 */ 701 {3399, 16, 27}, /* 15 */ 702 {3778, 17, 26}, /* 16 */ 703 {4177, 18, 26}, /* 17 */ 704 {4596, 19, 25}, /* 18 */ 705 {5036, 20, 25}, /* 19 */ 706 {5497, 21, 24}, /* 20 */ 707 {5979, 22, 24}, /* 21 */ 708 {6483, 23, 23}, /* 22 */ 709 {7009, 24, 23}, /* 23 */ 710 {7558, 25, 22}, /* 24 */ 711 {8130, 26, 22}, /* 25 */ 712 {8726, 27, 22}, /* 26 */ 713 {9346, 28, 21}, /* 27 */ 714 {9991, 29, 21}, /* 28 */ 715 {10661, 30, 21}, /* 29 */ 716 {11358, 31, 20}, /* 30 */ 717 {12082, 32, 20}, /* 31 */ 718 {12834, 33, 20}, /* 32 */ 719 {13614, 34, 19}, /* 33 */ 720 {14424, 35, 19}, /* 34 */ 721 {15265, 36, 19}, /* 35 */ 722 {16137, 37, 19}, /* 36 */ 723 {17042, 38, 18}, /* 37 */ 724 {17981, 39, 18}, /* 38 */ 725 {18955, 40, 18}, /* 39 */ 726 {19965, 41, 17}, /* 40 */ 727 {21013, 42, 17}, /* 41 */ 728 {22101, 43, 17}, /* 42 */ 729 {23230, 44, 17}, /* 43 */ 730 {24402, 45, 16}, /* 44 */ 731 {25618, 46, 16}, /* 45 */ 732 {26881, 47, 16}, /* 46 */ 733 {28193, 48, 16}, /* 47 */ 734 {29557, 49, 15}, /* 48 */ 735 {30975, 50, 15}, /* 49 */ 736 {32450, 51, 15}, /* 50 */ 737 {33986, 52, 15}, /* 51 */ 738 {35586, 53, 14}, /* 52 */ 739 {37253, 54, 14}, /* 53 */ 740 {38992, 55, 14}, /* 54 */ 741 {40808, 56, 14}, /* 55 */ 742 {42707, 57, 13}, /* 56 */ 743 {44694, 58, 13}, /* 57 */ 744 {46776, 59, 13}, /* 58 */ 745 {48961, 60, 13}, /* 59 */ 746 {51258, 61, 13}, /* 60 */ 747 {53677, 62, 12}, /* 61 */ 748 {56230, 63, 12}, /* 62 */ 749 {58932, 64, 12}, /* 63 */ 750 {61799, 65, 12}, /* 64 */ 751 {64851, 66, 11}, /* 65 */ 752 {68113, 67, 11}, /* 66 */ 753 {71617, 68, 11}, /* 67 */ 754 {75401, 69, 10}, /* 68 */ 755 {79517, 70, 10}, /* 69 */ 756 {84035, 71, 10}, /* 70 */ 757 {89053, 72, 10}, /* 71 */ 758 {94717, 73, 9} /* 72 */ 759}; 760 761static void 762sctp_hs_cwnd_increase(struct sctp_tcb *stcb, struct sctp_nets *net) 763{ 764 int cur_val, i, indx, incr; 765 766 cur_val = net->cwnd >> 10; 767 indx = SCTP_HS_TABLE_SIZE - 1; 768#ifdef SCTP_DEBUG 769 printf("HS CC CAlled.\n"); 770#endif 771 if (cur_val < sctp_cwnd_adjust[0].cwnd) { 772 /* normal mode */ 773 if (net->net_ack > net->mtu) { 774 net->cwnd += net->mtu; 775 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 776 sctp_log_cwnd(stcb, net, net->mtu, SCTP_CWND_LOG_FROM_SS); 777 } 778 } else { 779 net->cwnd += net->net_ack; 780 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 781 sctp_log_cwnd(stcb, net, net->net_ack, SCTP_CWND_LOG_FROM_SS); 782 } 783 } 784 } else { 785 for (i = net->last_hs_used; i < SCTP_HS_TABLE_SIZE; i++) { 786 if (cur_val < sctp_cwnd_adjust[i].cwnd) { 787 indx = i; 788 break; 789 } 790 } 791 net->last_hs_used = indx; 792 incr = ((sctp_cwnd_adjust[indx].increase) << 10); 793 net->cwnd += incr; 794 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 795 sctp_log_cwnd(stcb, net, incr, SCTP_CWND_LOG_FROM_SS); 796 } 797 } 798} 799 800static void 801sctp_hs_cwnd_decrease(struct sctp_tcb *stcb, struct sctp_nets *net) 802{ 803 int cur_val, i, indx; 804 int old_cwnd = net->cwnd; 805 806 cur_val = net->cwnd >> 10; 807 if (cur_val < sctp_cwnd_adjust[0].cwnd) { 808 /* normal mode */ 809 net->ssthresh = net->cwnd / 2; 810 if (net->ssthresh < (net->mtu * 2)) { 811 net->ssthresh = 2 * net->mtu; 812 } 813 net->cwnd = net->ssthresh; 814 } else { 815 /* drop by the proper amount */ 816 net->ssthresh = net->cwnd - (int)((net->cwnd / 100) * 817 sctp_cwnd_adjust[net->last_hs_used].drop_percent); 818 net->cwnd = net->ssthresh; 819 /* now where are we */ 820 indx = net->last_hs_used; 821 cur_val = net->cwnd >> 10; 822 /* reset where we are in the table */ 823 if (cur_val < sctp_cwnd_adjust[0].cwnd) { 824 /* feel out of hs */ 825 net->last_hs_used = 0; 826 } else { 827 for (i = indx; i >= 1; i--) { 828 if (cur_val > sctp_cwnd_adjust[i - 1].cwnd) { 829 break; 830 } 831 } 832 net->last_hs_used = indx; 833 } 834 } 835 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 836 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_FR); 837 } 838} 839 840static void 841sctp_hs_cwnd_update_after_fr(struct sctp_tcb *stcb, 842 struct sctp_association *asoc) 843{ 844 struct sctp_nets *net; 845 846 /* 847 * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) && 848 * (net->fast_retran_loss_recovery == 0))) 849 */ 850 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 851 if ((asoc->fast_retran_loss_recovery == 0) || 852 (asoc->sctp_cmt_on_off > 0)) { 853 /* out of a RFC2582 Fast recovery window? */ 854 if (net->net_ack > 0) { 855 /* 856 * per section 7.2.3, are there any 857 * destinations that had a fast retransmit 858 * to them. If so what we need to do is 859 * adjust ssthresh and cwnd. 860 */ 861 struct sctp_tmit_chunk *lchk; 862 863 sctp_hs_cwnd_decrease(stcb, net); 864 865 lchk = TAILQ_FIRST(&asoc->send_queue); 866 867 net->partial_bytes_acked = 0; 868 /* Turn on fast recovery window */ 869 asoc->fast_retran_loss_recovery = 1; 870 if (lchk == NULL) { 871 /* Mark end of the window */ 872 asoc->fast_recovery_tsn = asoc->sending_seq - 1; 873 } else { 874 asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; 875 } 876 877 /* 878 * CMT fast recovery -- per destination 879 * recovery variable. 880 */ 881 net->fast_retran_loss_recovery = 1; 882 883 if (lchk == NULL) { 884 /* Mark end of the window */ 885 net->fast_recovery_tsn = asoc->sending_seq - 1; 886 } else { 887 net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; 888 } 889 890 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, 891 stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_32); 892 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 893 stcb->sctp_ep, stcb, net); 894 } 895 } else if (net->net_ack > 0) { 896 /* 897 * Mark a peg that we WOULD have done a cwnd 898 * reduction but RFC2582 prevented this action. 899 */ 900 SCTP_STAT_INCR(sctps_fastretransinrtt); 901 } 902 } 903} 904 905static void 906sctp_hs_cwnd_update_after_sack(struct sctp_tcb *stcb, 907 struct sctp_association *asoc, 908 int accum_moved, int reneged_all, int will_exit) 909{ 910 struct sctp_nets *net; 911 912 /******************************/ 913 /* update cwnd and Early FR */ 914 /******************************/ 915 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 916 917#ifdef JANA_CMT_FAST_RECOVERY 918 /* 919 * CMT fast recovery code. Need to debug. 920 */ 921 if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) { 922 if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) || 923 SCTP_TSN_GE(net->pseudo_cumack, net->fast_recovery_tsn)) { 924 net->will_exit_fast_recovery = 1; 925 } 926 } 927#endif 928 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 929 /* 930 * So, first of all do we need to have a Early FR 931 * timer running? 932 */ 933 if ((!TAILQ_EMPTY(&asoc->sent_queue) && 934 (net->ref_count > 1) && 935 (net->flight_size < net->cwnd)) || 936 (reneged_all)) { 937 /* 938 * yes, so in this case stop it if its 939 * running, and then restart it. Reneging 940 * all is a special case where we want to 941 * run the Early FR timer and then force the 942 * last few unacked to be sent, causing us 943 * to illicit a sack with gaps to force out 944 * the others. 945 */ 946 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 947 SCTP_STAT_INCR(sctps_earlyfrstpidsck2); 948 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 949 SCTP_FROM_SCTP_INDATA + SCTP_LOC_20); 950 } 951 SCTP_STAT_INCR(sctps_earlyfrstrid); 952 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net); 953 } else { 954 /* No, stop it if its running */ 955 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 956 SCTP_STAT_INCR(sctps_earlyfrstpidsck3); 957 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 958 SCTP_FROM_SCTP_INDATA + SCTP_LOC_21); 959 } 960 } 961 } 962 /* if nothing was acked on this destination skip it */ 963 if (net->net_ack == 0) { 964 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 965 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK); 966 } 967 continue; 968 } 969 if (net->net_ack2 > 0) { 970 /* 971 * Karn's rule applies to clearing error count, this 972 * is optional. 973 */ 974 net->error_count = 0; 975 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) == 976 SCTP_ADDR_NOT_REACHABLE) { 977 /* addr came good */ 978 net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 979 net->dest_state |= SCTP_ADDR_REACHABLE; 980 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 981 SCTP_RECEIVED_SACK, (void *)net, SCTP_SO_NOT_LOCKED); 982 /* now was it the primary? if so restore */ 983 if (net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 984 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, net); 985 } 986 } 987 /* 988 * JRS 5/14/07 - If CMT PF is on and the destination 989 * is in PF state, set the destination to active 990 * state and set the cwnd to one or two MTU's based 991 * on whether PF1 or PF2 is being used. 992 * 993 * Should we stop any running T3 timer here? 994 */ 995 if ((asoc->sctp_cmt_on_off > 0) && 996 (asoc->sctp_cmt_pf > 0) && 997 ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) { 998 net->dest_state &= ~SCTP_ADDR_PF; 999 net->cwnd = net->mtu * asoc->sctp_cmt_pf; 1000 SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n", 1001 net, net->cwnd); 1002 /* 1003 * Since the cwnd value is explicitly set, 1004 * skip the code that updates the cwnd 1005 * value. 1006 */ 1007 goto skip_cwnd_update; 1008 } 1009 } 1010#ifdef JANA_CMT_FAST_RECOVERY 1011 /* 1012 * CMT fast recovery code 1013 */ 1014 /* 1015 * if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery 1016 * && net->will_exit_fast_recovery == 0) { @@@ Do something 1017 * } else if (sctp_cmt_on_off == 0 && 1018 * asoc->fast_retran_loss_recovery && will_exit == 0) { 1019 */ 1020#endif 1021 1022 if (asoc->fast_retran_loss_recovery && 1023 (will_exit == 0) && 1024 (asoc->sctp_cmt_on_off == 0)) { 1025 /* 1026 * If we are in loss recovery we skip any cwnd 1027 * update 1028 */ 1029 goto skip_cwnd_update; 1030 } 1031 /* 1032 * CMT: CUC algorithm. Update cwnd if pseudo-cumack has 1033 * moved. 1034 */ 1035 if (accum_moved || 1036 ((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) { 1037 /* If the cumulative ack moved we can proceed */ 1038 if (net->cwnd <= net->ssthresh) { 1039 /* We are in slow start */ 1040 if (net->flight_size + net->net_ack >= net->cwnd) { 1041 1042 sctp_hs_cwnd_increase(stcb, net); 1043 1044 } else { 1045 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 1046 sctp_log_cwnd(stcb, net, net->net_ack, 1047 SCTP_CWND_LOG_NOADV_SS); 1048 } 1049 } 1050 } else { 1051 /* We are in congestion avoidance */ 1052 net->partial_bytes_acked += net->net_ack; 1053 if ((net->flight_size + net->net_ack >= net->cwnd) && 1054 (net->partial_bytes_acked >= net->cwnd)) { 1055 net->partial_bytes_acked -= net->cwnd; 1056 net->cwnd += net->mtu; 1057 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1058 sctp_log_cwnd(stcb, net, net->mtu, 1059 SCTP_CWND_LOG_FROM_CA); 1060 } 1061 } else { 1062 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 1063 sctp_log_cwnd(stcb, net, net->net_ack, 1064 SCTP_CWND_LOG_NOADV_CA); 1065 } 1066 } 1067 } 1068 } else { 1069 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 1070 sctp_log_cwnd(stcb, net, net->mtu, 1071 SCTP_CWND_LOG_NO_CUMACK); 1072 } 1073 } 1074skip_cwnd_update: 1075 /* 1076 * NOW, according to Karn's rule do we need to restore the 1077 * RTO timer back? Check our net_ack2. If not set then we 1078 * have a ambiguity.. i.e. all data ack'd was sent to more 1079 * than one place. 1080 */ 1081 if (net->net_ack2) { 1082 /* restore any doubled timers */ 1083 net->RTO = ((net->lastsa >> 2) + net->lastsv) >> 1; 1084 if (net->RTO < stcb->asoc.minrto) { 1085 net->RTO = stcb->asoc.minrto; 1086 } 1087 if (net->RTO > stcb->asoc.maxrto) { 1088 net->RTO = stcb->asoc.maxrto; 1089 } 1090 } 1091 } 1092} 1093 1094 1095/* 1096 * H-TCP congestion control. The algorithm is detailed in: 1097 * R.N.Shorten, D.J.Leith: 1098 * "H-TCP: TCP for high-speed and long-distance networks" 1099 * Proc. PFLDnet, Argonne, 2004. 1100 * http://www.hamilton.ie/net/htcp3.pdf 1101 */ 1102 1103 1104static int use_rtt_scaling = 1; 1105static int use_bandwidth_switch = 1; 1106 1107static inline int 1108between(uint32_t seq1, uint32_t seq2, uint32_t seq3) 1109{ 1110 return seq3 - seq2 >= seq1 - seq2; 1111} 1112 1113static inline uint32_t 1114htcp_cong_time(struct htcp *ca) 1115{ 1116 return sctp_get_tick_count() - ca->last_cong; 1117} 1118 1119static inline uint32_t 1120htcp_ccount(struct htcp *ca) 1121{ 1122 return htcp_cong_time(ca) / ca->minRTT; 1123} 1124 1125static inline void 1126htcp_reset(struct htcp *ca) 1127{ 1128 ca->undo_last_cong = ca->last_cong; 1129 ca->undo_maxRTT = ca->maxRTT; 1130 ca->undo_old_maxB = ca->old_maxB; 1131 ca->last_cong = sctp_get_tick_count(); 1132} 1133 1134#ifdef SCTP_NOT_USED 1135 1136static uint32_t 1137htcp_cwnd_undo(struct sctp_tcb *stcb, struct sctp_nets *net) 1138{ 1139 net->htcp_ca.last_cong = net->htcp_ca.undo_last_cong; 1140 net->htcp_ca.maxRTT = net->htcp_ca.undo_maxRTT; 1141 net->htcp_ca.old_maxB = net->htcp_ca.undo_old_maxB; 1142 return max(net->cwnd, ((net->ssthresh / net->mtu << 7) / net->htcp_ca.beta) * net->mtu); 1143} 1144 1145#endif 1146 1147static inline void 1148measure_rtt(struct sctp_tcb *stcb, struct sctp_nets *net) 1149{ 1150 uint32_t srtt = net->lastsa >> 3; 1151 1152 /* keep track of minimum RTT seen so far, minRTT is zero at first */ 1153 if (net->htcp_ca.minRTT > srtt || !net->htcp_ca.minRTT) 1154 net->htcp_ca.minRTT = srtt; 1155 1156 /* max RTT */ 1157 if (net->fast_retran_ip == 0 && net->ssthresh < 0xFFFF && htcp_ccount(&net->htcp_ca) > 3) { 1158 if (net->htcp_ca.maxRTT < net->htcp_ca.minRTT) 1159 net->htcp_ca.maxRTT = net->htcp_ca.minRTT; 1160 if (net->htcp_ca.maxRTT < srtt && srtt <= net->htcp_ca.maxRTT + MSEC_TO_TICKS(20)) 1161 net->htcp_ca.maxRTT = srtt; 1162 } 1163} 1164 1165static void 1166measure_achieved_throughput(struct sctp_tcb *stcb, struct sctp_nets *net) 1167{ 1168 uint32_t now = sctp_get_tick_count(); 1169 1170 if (net->fast_retran_ip == 0) 1171 net->htcp_ca.bytes_acked = net->net_ack; 1172 1173 if (!use_bandwidth_switch) 1174 return; 1175 1176 /* achieved throughput calculations */ 1177 /* JRS - not 100% sure of this statement */ 1178 if (net->fast_retran_ip == 1) { 1179 net->htcp_ca.bytecount = 0; 1180 net->htcp_ca.lasttime = now; 1181 return; 1182 } 1183 net->htcp_ca.bytecount += net->net_ack; 1184 1185 if (net->htcp_ca.bytecount >= net->cwnd - ((net->htcp_ca.alpha >> 7 ? : 1) * net->mtu) 1186 && now - net->htcp_ca.lasttime >= net->htcp_ca.minRTT 1187 && net->htcp_ca.minRTT > 0) { 1188 uint32_t cur_Bi = net->htcp_ca.bytecount / net->mtu * hz / (now - net->htcp_ca.lasttime); 1189 1190 if (htcp_ccount(&net->htcp_ca) <= 3) { 1191 /* just after backoff */ 1192 net->htcp_ca.minB = net->htcp_ca.maxB = net->htcp_ca.Bi = cur_Bi; 1193 } else { 1194 net->htcp_ca.Bi = (3 * net->htcp_ca.Bi + cur_Bi) / 4; 1195 if (net->htcp_ca.Bi > net->htcp_ca.maxB) 1196 net->htcp_ca.maxB = net->htcp_ca.Bi; 1197 if (net->htcp_ca.minB > net->htcp_ca.maxB) 1198 net->htcp_ca.minB = net->htcp_ca.maxB; 1199 } 1200 net->htcp_ca.bytecount = 0; 1201 net->htcp_ca.lasttime = now; 1202 } 1203} 1204 1205static inline void 1206htcp_beta_update(struct htcp *ca, uint32_t minRTT, uint32_t maxRTT) 1207{ 1208 if (use_bandwidth_switch) { 1209 uint32_t maxB = ca->maxB; 1210 uint32_t old_maxB = ca->old_maxB; 1211 1212 ca->old_maxB = ca->maxB; 1213 1214 if (!between(5 * maxB, 4 * old_maxB, 6 * old_maxB)) { 1215 ca->beta = BETA_MIN; 1216 ca->modeswitch = 0; 1217 return; 1218 } 1219 } 1220 if (ca->modeswitch && minRTT > (uint32_t) MSEC_TO_TICKS(10) && maxRTT) { 1221 ca->beta = (minRTT << 7) / maxRTT; 1222 if (ca->beta < BETA_MIN) 1223 ca->beta = BETA_MIN; 1224 else if (ca->beta > BETA_MAX) 1225 ca->beta = BETA_MAX; 1226 } else { 1227 ca->beta = BETA_MIN; 1228 ca->modeswitch = 1; 1229 } 1230} 1231 1232static inline void 1233htcp_alpha_update(struct htcp *ca) 1234{ 1235 uint32_t minRTT = ca->minRTT; 1236 uint32_t factor = 1; 1237 uint32_t diff = htcp_cong_time(ca); 1238 1239 if (diff > (uint32_t) hz) { 1240 diff -= hz; 1241 factor = 1 + (10 * diff + ((diff / 2) * (diff / 2) / hz)) / hz; 1242 } 1243 if (use_rtt_scaling && minRTT) { 1244 uint32_t scale = (hz << 3) / (10 * minRTT); 1245 1246 scale = min(max(scale, 1U << 2), 10U << 3); /* clamping ratio to 1247 * interval [0.5,10]<<3 */ 1248 factor = (factor << 3) / scale; 1249 if (!factor) 1250 factor = 1; 1251 } 1252 ca->alpha = 2 * factor * ((1 << 7) - ca->beta); 1253 if (!ca->alpha) 1254 ca->alpha = ALPHA_BASE; 1255} 1256 1257/* After we have the rtt data to calculate beta, we'd still prefer to wait one 1258 * rtt before we adjust our beta to ensure we are working from a consistent 1259 * data. 1260 * 1261 * This function should be called when we hit a congestion event since only at 1262 * that point do we really have a real sense of maxRTT (the queues en route 1263 * were getting just too full now). 1264 */ 1265static void 1266htcp_param_update(struct sctp_tcb *stcb, struct sctp_nets *net) 1267{ 1268 uint32_t minRTT = net->htcp_ca.minRTT; 1269 uint32_t maxRTT = net->htcp_ca.maxRTT; 1270 1271 htcp_beta_update(&net->htcp_ca, minRTT, maxRTT); 1272 htcp_alpha_update(&net->htcp_ca); 1273 1274 /* 1275 * add slowly fading memory for maxRTT to accommodate routing 1276 * changes etc 1277 */ 1278 if (minRTT > 0 && maxRTT > minRTT) 1279 net->htcp_ca.maxRTT = minRTT + ((maxRTT - minRTT) * 95) / 100; 1280} 1281 1282static uint32_t 1283htcp_recalc_ssthresh(struct sctp_tcb *stcb, struct sctp_nets *net) 1284{ 1285 htcp_param_update(stcb, net); 1286 return max(((net->cwnd / net->mtu * net->htcp_ca.beta) >> 7) * net->mtu, 2U * net->mtu); 1287} 1288 1289static void 1290htcp_cong_avoid(struct sctp_tcb *stcb, struct sctp_nets *net) 1291{ 1292 /*- 1293 * How to handle these functions? 1294 * if (!tcp_is_cwnd_limited(sk, in_flight)) RRS - good question. 1295 * return; 1296 */ 1297 if (net->cwnd <= net->ssthresh) { 1298 /* We are in slow start */ 1299 if (net->flight_size + net->net_ack >= net->cwnd) { 1300 if (net->net_ack > (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable))) { 1301 net->cwnd += (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable)); 1302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1303 sctp_log_cwnd(stcb, net, net->mtu, 1304 SCTP_CWND_LOG_FROM_SS); 1305 } 1306 } else { 1307 net->cwnd += net->net_ack; 1308 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1309 sctp_log_cwnd(stcb, net, net->net_ack, 1310 SCTP_CWND_LOG_FROM_SS); 1311 } 1312 } 1313 } else { 1314 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 1315 sctp_log_cwnd(stcb, net, net->net_ack, 1316 SCTP_CWND_LOG_NOADV_SS); 1317 } 1318 } 1319 } else { 1320 measure_rtt(stcb, net); 1321 1322 /* 1323 * In dangerous area, increase slowly. In theory this is 1324 * net->cwnd += alpha / net->cwnd 1325 */ 1326 /* What is snd_cwnd_cnt?? */ 1327 if (((net->partial_bytes_acked / net->mtu * net->htcp_ca.alpha) >> 7) * net->mtu >= net->cwnd) { 1328 /*- 1329 * Does SCTP have a cwnd clamp? 1330 * if (net->snd_cwnd < net->snd_cwnd_clamp) - Nope (RRS). 1331 */ 1332 net->cwnd += net->mtu; 1333 net->partial_bytes_acked = 0; 1334 htcp_alpha_update(&net->htcp_ca); 1335 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1336 sctp_log_cwnd(stcb, net, net->mtu, 1337 SCTP_CWND_LOG_FROM_CA); 1338 } 1339 } else { 1340 net->partial_bytes_acked += net->net_ack; 1341 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 1342 sctp_log_cwnd(stcb, net, net->net_ack, 1343 SCTP_CWND_LOG_NOADV_CA); 1344 } 1345 } 1346 1347 net->htcp_ca.bytes_acked = net->mtu; 1348 } 1349} 1350 1351#ifdef SCTP_NOT_USED 1352/* Lower bound on congestion window. */ 1353static uint32_t 1354htcp_min_cwnd(struct sctp_tcb *stcb, struct sctp_nets *net) 1355{ 1356 return net->ssthresh; 1357} 1358 1359#endif 1360 1361static void 1362htcp_init(struct sctp_tcb *stcb, struct sctp_nets *net) 1363{ 1364 memset(&net->htcp_ca, 0, sizeof(struct htcp)); 1365 net->htcp_ca.alpha = ALPHA_BASE; 1366 net->htcp_ca.beta = BETA_MIN; 1367 net->htcp_ca.bytes_acked = net->mtu; 1368 net->htcp_ca.last_cong = sctp_get_tick_count(); 1369} 1370 1371static void 1372sctp_htcp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net) 1373{ 1374 /* 1375 * We take the max of the burst limit times a MTU or the 1376 * INITIAL_CWND. We then limit this to 4 MTU's of sending. 1377 */ 1378 net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND)); 1379 net->ssthresh = stcb->asoc.peers_rwnd; 1380 htcp_init(stcb, net); 1381 1382 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 1383 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_INITIALIZATION); 1384 } 1385} 1386 1387static void 1388sctp_htcp_cwnd_update_after_sack(struct sctp_tcb *stcb, 1389 struct sctp_association *asoc, 1390 int accum_moved, int reneged_all, int will_exit) 1391{ 1392 struct sctp_nets *net; 1393 1394 /******************************/ 1395 /* update cwnd and Early FR */ 1396 /******************************/ 1397 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 1398 1399#ifdef JANA_CMT_FAST_RECOVERY 1400 /* 1401 * CMT fast recovery code. Need to debug. 1402 */ 1403 if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) { 1404 if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) || 1405 SCTP_TSN_GE(net->pseudo_cumack, net->fast_recovery_tsn)) { 1406 net->will_exit_fast_recovery = 1; 1407 } 1408 } 1409#endif 1410 if (SCTP_BASE_SYSCTL(sctp_early_fr)) { 1411 /* 1412 * So, first of all do we need to have a Early FR 1413 * timer running? 1414 */ 1415 if ((!TAILQ_EMPTY(&asoc->sent_queue) && 1416 (net->ref_count > 1) && 1417 (net->flight_size < net->cwnd)) || 1418 (reneged_all)) { 1419 /* 1420 * yes, so in this case stop it if its 1421 * running, and then restart it. Reneging 1422 * all is a special case where we want to 1423 * run the Early FR timer and then force the 1424 * last few unacked to be sent, causing us 1425 * to illicit a sack with gaps to force out 1426 * the others. 1427 */ 1428 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 1429 SCTP_STAT_INCR(sctps_earlyfrstpidsck2); 1430 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 1431 SCTP_FROM_SCTP_INDATA + SCTP_LOC_20); 1432 } 1433 SCTP_STAT_INCR(sctps_earlyfrstrid); 1434 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net); 1435 } else { 1436 /* No, stop it if its running */ 1437 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { 1438 SCTP_STAT_INCR(sctps_earlyfrstpidsck3); 1439 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, 1440 SCTP_FROM_SCTP_INDATA + SCTP_LOC_21); 1441 } 1442 } 1443 } 1444 /* if nothing was acked on this destination skip it */ 1445 if (net->net_ack == 0) { 1446 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 1447 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK); 1448 } 1449 continue; 1450 } 1451 if (net->net_ack2 > 0) { 1452 /* 1453 * Karn's rule applies to clearing error count, this 1454 * is optional. 1455 */ 1456 net->error_count = 0; 1457 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) == 1458 SCTP_ADDR_NOT_REACHABLE) { 1459 /* addr came good */ 1460 net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 1461 net->dest_state |= SCTP_ADDR_REACHABLE; 1462 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 1463 SCTP_RECEIVED_SACK, (void *)net, SCTP_SO_NOT_LOCKED); 1464 /* now was it the primary? if so restore */ 1465 if (net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 1466 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, net); 1467 } 1468 } 1469 /* 1470 * JRS 5/14/07 - If CMT PF is on and the destination 1471 * is in PF state, set the destination to active 1472 * state and set the cwnd to one or two MTU's based 1473 * on whether PF1 or PF2 is being used. 1474 * 1475 * Should we stop any running T3 timer here? 1476 */ 1477 if ((asoc->sctp_cmt_on_off > 0) && 1478 (asoc->sctp_cmt_pf > 0) && 1479 ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) { 1480 net->dest_state &= ~SCTP_ADDR_PF; 1481 net->cwnd = net->mtu * asoc->sctp_cmt_pf; 1482 SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n", 1483 net, net->cwnd); 1484 /* 1485 * Since the cwnd value is explicitly set, 1486 * skip the code that updates the cwnd 1487 * value. 1488 */ 1489 goto skip_cwnd_update; 1490 } 1491 } 1492#ifdef JANA_CMT_FAST_RECOVERY 1493 /* 1494 * CMT fast recovery code 1495 */ 1496 /* 1497 * if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery 1498 * && net->will_exit_fast_recovery == 0) { @@@ Do something 1499 * } else if (sctp_cmt_on_off == 0 && 1500 * asoc->fast_retran_loss_recovery && will_exit == 0) { 1501 */ 1502#endif 1503 1504 if (asoc->fast_retran_loss_recovery && 1505 will_exit == 0 && 1506 (asoc->sctp_cmt_on_off == 0)) { 1507 /* 1508 * If we are in loss recovery we skip any cwnd 1509 * update 1510 */ 1511 goto skip_cwnd_update; 1512 } 1513 /* 1514 * CMT: CUC algorithm. Update cwnd if pseudo-cumack has 1515 * moved. 1516 */ 1517 if (accum_moved || 1518 ((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) { 1519 htcp_cong_avoid(stcb, net); 1520 measure_achieved_throughput(stcb, net); 1521 } else { 1522 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 1523 sctp_log_cwnd(stcb, net, net->mtu, 1524 SCTP_CWND_LOG_NO_CUMACK); 1525 } 1526 } 1527skip_cwnd_update: 1528 /* 1529 * NOW, according to Karn's rule do we need to restore the 1530 * RTO timer back? Check our net_ack2. If not set then we 1531 * have a ambiguity.. i.e. all data ack'd was sent to more 1532 * than one place. 1533 */ 1534 if (net->net_ack2) { 1535 /* restore any doubled timers */ 1536 net->RTO = ((net->lastsa >> 2) + net->lastsv) >> 1; 1537 if (net->RTO < stcb->asoc.minrto) { 1538 net->RTO = stcb->asoc.minrto; 1539 } 1540 if (net->RTO > stcb->asoc.maxrto) { 1541 net->RTO = stcb->asoc.maxrto; 1542 } 1543 } 1544 } 1545} 1546 1547static void 1548sctp_htcp_cwnd_update_after_fr(struct sctp_tcb *stcb, 1549 struct sctp_association *asoc) 1550{ 1551 struct sctp_nets *net; 1552 1553 /* 1554 * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) && 1555 * (net->fast_retran_loss_recovery == 0))) 1556 */ 1557 TAILQ_FOREACH(net, &asoc->nets, sctp_next) { 1558 if ((asoc->fast_retran_loss_recovery == 0) || 1559 (asoc->sctp_cmt_on_off > 0)) { 1560 /* out of a RFC2582 Fast recovery window? */ 1561 if (net->net_ack > 0) { 1562 /* 1563 * per section 7.2.3, are there any 1564 * destinations that had a fast retransmit 1565 * to them. If so what we need to do is 1566 * adjust ssthresh and cwnd. 1567 */ 1568 struct sctp_tmit_chunk *lchk; 1569 int old_cwnd = net->cwnd; 1570 1571 /* JRS - reset as if state were changed */ 1572 htcp_reset(&net->htcp_ca); 1573 net->ssthresh = htcp_recalc_ssthresh(stcb, net); 1574 net->cwnd = net->ssthresh; 1575 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1576 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), 1577 SCTP_CWND_LOG_FROM_FR); 1578 } 1579 lchk = TAILQ_FIRST(&asoc->send_queue); 1580 1581 net->partial_bytes_acked = 0; 1582 /* Turn on fast recovery window */ 1583 asoc->fast_retran_loss_recovery = 1; 1584 if (lchk == NULL) { 1585 /* Mark end of the window */ 1586 asoc->fast_recovery_tsn = asoc->sending_seq - 1; 1587 } else { 1588 asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; 1589 } 1590 1591 /* 1592 * CMT fast recovery -- per destination 1593 * recovery variable. 1594 */ 1595 net->fast_retran_loss_recovery = 1; 1596 1597 if (lchk == NULL) { 1598 /* Mark end of the window */ 1599 net->fast_recovery_tsn = asoc->sending_seq - 1; 1600 } else { 1601 net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; 1602 } 1603 1604 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, 1605 stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_32); 1606 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 1607 stcb->sctp_ep, stcb, net); 1608 } 1609 } else if (net->net_ack > 0) { 1610 /* 1611 * Mark a peg that we WOULD have done a cwnd 1612 * reduction but RFC2582 prevented this action. 1613 */ 1614 SCTP_STAT_INCR(sctps_fastretransinrtt); 1615 } 1616 } 1617} 1618 1619static void 1620sctp_htcp_cwnd_update_after_timeout(struct sctp_tcb *stcb, 1621 struct sctp_nets *net) 1622{ 1623 int old_cwnd = net->cwnd; 1624 1625 /* JRS - reset as if the state were being changed to timeout */ 1626 htcp_reset(&net->htcp_ca); 1627 net->ssthresh = htcp_recalc_ssthresh(stcb, net); 1628 net->cwnd = net->mtu; 1629 net->partial_bytes_acked = 0; 1630 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1631 sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX); 1632 } 1633} 1634 1635static void 1636sctp_htcp_cwnd_update_after_fr_timer(struct sctp_inpcb *inp, 1637 struct sctp_tcb *stcb, struct sctp_nets *net) 1638{ 1639 int old_cwnd; 1640 1641 old_cwnd = net->cwnd; 1642 1643 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_EARLY_FR_TMR, SCTP_SO_NOT_LOCKED); 1644 net->htcp_ca.last_cong = sctp_get_tick_count(); 1645 /* 1646 * make a small adjustment to cwnd and force to CA. 1647 */ 1648 if (net->cwnd > net->mtu) 1649 /* drop down one MTU after sending */ 1650 net->cwnd -= net->mtu; 1651 if (net->cwnd < net->ssthresh) 1652 /* still in SS move to CA */ 1653 net->ssthresh = net->cwnd - 1; 1654 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1655 sctp_log_cwnd(stcb, net, (old_cwnd - net->cwnd), SCTP_CWND_LOG_FROM_FR); 1656 } 1657} 1658 1659static void 1660sctp_htcp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb, 1661 struct sctp_nets *net, int in_window, int num_pkt_lost) 1662{ 1663 int old_cwnd; 1664 1665 old_cwnd = net->cwnd; 1666 1667 /* JRS - reset hctp as if state changed */ 1668 if (in_window == 0) { 1669 htcp_reset(&net->htcp_ca); 1670 SCTP_STAT_INCR(sctps_ecnereducedcwnd); 1671 net->ssthresh = htcp_recalc_ssthresh(stcb, net); 1672 if (net->ssthresh < net->mtu) { 1673 net->ssthresh = net->mtu; 1674 /* here back off the timer as well, to slow us down */ 1675 net->RTO <<= 1; 1676 } 1677 net->cwnd = net->ssthresh; 1678 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1679 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); 1680 } 1681 } 1682} 1683 1684struct sctp_cc_functions sctp_cc_functions[] = { 1685 { 1686 .sctp_set_initial_cc_param = sctp_set_initial_cc_param, 1687 .sctp_cwnd_update_after_sack = sctp_cwnd_update_after_sack, 1688 .sctp_cwnd_update_after_fr = sctp_cwnd_update_after_fr, 1689 .sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout, 1690 .sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_after_ecn_echo, 1691 .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped, 1692 .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output, 1693 .sctp_cwnd_update_after_fr_timer = sctp_cwnd_update_after_fr_timer 1694 }, 1695 { 1696 .sctp_set_initial_cc_param = sctp_set_initial_cc_param, 1697 .sctp_cwnd_update_after_sack = sctp_hs_cwnd_update_after_sack, 1698 .sctp_cwnd_update_after_fr = sctp_hs_cwnd_update_after_fr, 1699 .sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout, 1700 .sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_after_ecn_echo, 1701 .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped, 1702 .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output, 1703 .sctp_cwnd_update_after_fr_timer = sctp_cwnd_update_after_fr_timer 1704 }, 1705 { 1706 .sctp_set_initial_cc_param = sctp_htcp_set_initial_cc_param, 1707 .sctp_cwnd_update_after_sack = sctp_htcp_cwnd_update_after_sack, 1708 .sctp_cwnd_update_after_fr = sctp_htcp_cwnd_update_after_fr, 1709 .sctp_cwnd_update_after_timeout = sctp_htcp_cwnd_update_after_timeout, 1710 .sctp_cwnd_update_after_ecn_echo = sctp_htcp_cwnd_update_after_ecn_echo, 1711 .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped, 1712 .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output, 1713 .sctp_cwnd_update_after_fr_timer = sctp_htcp_cwnd_update_after_fr_timer 1714 } 1715}; 1716