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