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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.

--- 29 unchanged lines hidden (view full) ---

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: head/sys/netinet/sctp_cc_functions.c 179157 2008-05-20 13:47:46Z rrs $");
46__FBSDID("$FreeBSD: head/sys/netinet/sctp_cc_functions.c 179783 2008-06-14 07:58:05Z rrs $");
47void
48sctp_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)) {
58 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
59 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_INITIALIZATION);
60 }
61}
62
63void
64sctp_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)) {
74 if ((asoc->fast_retran_loss_recovery == 0) || (SCTP_BASE_SYSCTL(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) {
91 if (SCTP_BASE_SYSCTL(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;

--- 60 unchanged lines hidden (view full) ---

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) {
168 if (SCTP_BASE_SYSCTL(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)) {

--- 19 unchanged lines hidden (view full) ---

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) {
204 if (SCTP_BASE_SYSCTL(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.

--- 14 unchanged lines hidden (view full) ---

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)) {
235 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
236 SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
237 ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
238 net->dest_state &= ~SCTP_ADDR_PF;
238 net->cwnd = net->mtu * sctp_cmt_pf;
239 net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf);
240 SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n",
241 net, net->cwnd);
242 /*
243 * Since the cwnd value is explicitly set,
244 * skip the code that updates the cwnd
245 * value.
246 */
247 goto skip_cwnd_update;

--- 7 unchanged lines hidden (view full) ---

255 * if (sctp_cmt_on_off == 1 &&
256 * net->fast_retran_loss_recovery &&
257 * net->will_exit_fast_recovery == 0) { @@@ Do something }
258 * else if (sctp_cmt_on_off == 0 &&
259 * asoc->fast_retran_loss_recovery && will_exit == 0) {
260 */
261#endif
262
262 if (asoc->fast_retran_loss_recovery && will_exit == 0 && sctp_cmt_on_off == 0) {
263 if (asoc->fast_retran_loss_recovery && will_exit == 0 && SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) {
264 /*
265 * If we are in loss recovery we skip any cwnd
266 * update
267 */
268 goto skip_cwnd_update;
269 }
270 /*
271 * CMT: CUC algorithm. Update cwnd if pseudo-cumack has
272 * moved.
273 */
273 if (accum_moved || (sctp_cmt_on_off && net->new_pseudo_cumack)) {
274 if (accum_moved || (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && net->new_pseudo_cumack)) {
275 /* If the cumulative ack moved we can proceed */
276 if (net->cwnd <= net->ssthresh) {
277 /* We are in slow start */
278 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) {
279 if (net->net_ack > (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable))) {
280 net->cwnd += (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable));
281 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
282 sctp_log_cwnd(stcb, net, net->mtu,
283 SCTP_CWND_LOG_FROM_SS);
284 }
285 } else {
286 net->cwnd += net->net_ack;
286 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
287 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
288 sctp_log_cwnd(stcb, net, net->net_ack,
289 SCTP_CWND_LOG_FROM_SS);
290 }
291 }
292 } else {
292 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
293 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
294 sctp_log_cwnd(stcb, net, net->net_ack,
295 SCTP_CWND_LOG_NOADV_SS);
296 }
297 }
298 } else {
299 /* We are in congestion avoidance */
300 /*
301 * Add to pba
302 */
303 net->partial_bytes_acked += net->net_ack;
304
305 if ((net->flight_size + net->net_ack >= net->cwnd) &&
306 (net->partial_bytes_acked >= net->cwnd)) {
307 net->partial_bytes_acked -= net->cwnd;
308 net->cwnd += net->mtu;
308 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
309 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
310 sctp_log_cwnd(stcb, net, net->mtu,
311 SCTP_CWND_LOG_FROM_CA);
312 }
313 } else {
313 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
314 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
315 sctp_log_cwnd(stcb, net, net->net_ack,
316 SCTP_CWND_LOG_NOADV_CA);
317 }
318 }
319 }
320 } else {
320 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
321 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
322 sctp_log_cwnd(stcb, net, net->mtu,
323 SCTP_CWND_LOG_NO_CUMACK);
324 }
325 }
326skip_cwnd_update:
327 /*
328 * NOW, according to Karn's rule do we need to restore the
329 * RTO timer back? Check our net_ack2. If not set then we

--- 17 unchanged lines hidden (view full) ---

347sctp_cwnd_update_after_timeout(struct sctp_tcb *stcb, struct sctp_nets *net)
348{
349 int old_cwnd = net->cwnd;
350
351 net->ssthresh = max(net->cwnd / 2, 2 * net->mtu);
352 net->cwnd = net->mtu;
353 net->partial_bytes_acked = 0;
354
354 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
355 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
356 sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX);
357 }
358}
359
360void
361sctp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net)
362{
363 int old_cwnd = net->cwnd;
364
365 SCTP_STAT_INCR(sctps_ecnereducedcwnd);
366 net->ssthresh = net->cwnd / 2;
367 if (net->ssthresh < net->mtu) {
368 net->ssthresh = net->mtu;
369 /* here back off the timer as well, to slow us down */
370 net->RTO <<= 1;
371 }
372 net->cwnd = net->ssthresh;
372 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
373 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
374 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT);
375 }
376}
377
378void
379sctp_cwnd_update_after_packet_dropped(struct sctp_tcb *stcb,
380 struct sctp_nets *net, struct sctp_pktdrop_chunk *cp,
381 uint32_t * bottle_bw, uint32_t * on_queue)

--- 92 unchanged lines hidden (view full) ---

474 net->cwnd = bw_avail;
475 }
476 if (net->cwnd < net->mtu) {
477 /* We always have 1 MTU */
478 net->cwnd = net->mtu;
479 }
480 if (net->cwnd - old_cwnd != 0) {
481 /* log only changes */
481 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
482 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
483 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd),
484 SCTP_CWND_LOG_FROM_SAT);
485 }
486 }
487}
488
489void
490sctp_cwnd_update_after_output(struct sctp_tcb *stcb,
491 struct sctp_nets *net, int burst_limit)
492{
493 int old_cwnd = net->cwnd;
494
495 if (net->ssthresh < net->cwnd)
496 net->ssthresh = net->cwnd;
497 net->cwnd = (net->flight_size + (burst_limit * net->mtu));
498
498 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
499 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
500 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_BRST);
501 }
502}
503
504void
505sctp_cwnd_update_after_fr_timer(struct sctp_inpcb *inp,
506 struct sctp_tcb *stcb, struct sctp_nets *net)
507{

--- 4 unchanged lines hidden (view full) ---

512 * make a small adjustment to cwnd and force to CA.
513 */
514 if (net->cwnd > net->mtu)
515 /* drop down one MTU after sending */
516 net->cwnd -= net->mtu;
517 if (net->cwnd < net->ssthresh)
518 /* still in SS move to CA */
519 net->ssthresh = net->cwnd - 1;
519 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
520 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
521 sctp_log_cwnd(stcb, net, (old_cwnd - net->cwnd), SCTP_CWND_LOG_FROM_FR);
522 }
523}
524
525struct sctp_hs_raise_drop {
526 int32_t cwnd;
527 int32_t increase;
528 int32_t drop_percent;

--- 86 unchanged lines hidden (view full) ---

615 indx = SCTP_HS_TABLE_SIZE - 1;
616#ifdef SCTP_DEBUG
617 printf("HS CC CAlled.\n");
618#endif
619 if (cur_val < sctp_cwnd_adjust[0].cwnd) {
620 /* normal mode */
621 if (net->net_ack > net->mtu) {
622 net->cwnd += net->mtu;
622 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
623 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
624 sctp_log_cwnd(stcb, net, net->mtu, SCTP_CWND_LOG_FROM_SS);
625 }
626 } else {
627 net->cwnd += net->net_ack;
627 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
628 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
629 sctp_log_cwnd(stcb, net, net->net_ack, SCTP_CWND_LOG_FROM_SS);
630 }
631 }
632 } else {
633 for (i = net->last_hs_used; i < SCTP_HS_TABLE_SIZE; i++) {
634 if (cur_val < sctp_cwnd_adjust[i].cwnd) {
635 indx = i;
636 break;
637 }
638 }
639 net->last_hs_used = indx;
640 incr = ((sctp_cwnd_adjust[indx].increase) << 10);
641 net->cwnd += incr;
641 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
642 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
643 sctp_log_cwnd(stcb, net, incr, SCTP_CWND_LOG_FROM_SS);
644 }
645 }
646}
647
648static void
649sctp_hs_cwnd_decrease(struct sctp_tcb *stcb, struct sctp_nets *net)
650{

--- 25 unchanged lines hidden (view full) ---

676 for (i = indx; i >= 1; i--) {
677 if (cur_val > sctp_cwnd_adjust[i - 1].cwnd) {
678 break;
679 }
680 }
681 net->last_hs_used = indx;
682 }
683 }
683 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
684 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
685 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_FR);
686 }
687}
688
689void
690sctp_hs_cwnd_update_after_fr(struct sctp_tcb *stcb,
691 struct sctp_association *asoc)
692{
693 struct sctp_nets *net;
694
695 /*
696 * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off == 1) &&
697 * (net->fast_retran_loss_recovery == 0)))
698 */
699 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
699 if ((asoc->fast_retran_loss_recovery == 0) || (sctp_cmt_on_off == 1)) {
700 if ((asoc->fast_retran_loss_recovery == 0) || (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 1)) {
701 /* out of a RFC2582 Fast recovery window? */
702 if (net->net_ack > 0) {
703 /*
704 * per section 7.2.3, are there any
705 * destinations that had a fast retransmit
706 * to them. If so what we need to do is
707 * adjust ssthresh and cwnd.
708 */

--- 69 unchanged lines hidden (view full) ---

778 net->fast_recovery_tsn, MAX_TSN) ||
779 (asoc->last_acked_seq == net->fast_recovery_tsn) ||
780 compare_with_wrap(net->pseudo_cumack, net->fast_recovery_tsn, MAX_TSN) ||
781 (net->pseudo_cumack == net->fast_recovery_tsn)) {
782 net->will_exit_fast_recovery = 1;
783 }
784 }
785#endif
785 if (sctp_early_fr) {
786 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
787 /*
788 * So, first of all do we need to have a Early FR
789 * timer running?
790 */
791 if (((TAILQ_FIRST(&asoc->sent_queue)) &&
792 (net->ref_count > 1) &&
793 (net->flight_size < net->cwnd)) ||
794 (reneged_all)) {

--- 19 unchanged lines hidden (view full) ---

814 SCTP_STAT_INCR(sctps_earlyfrstpidsck3);
815 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
816 SCTP_FROM_SCTP_INDATA + SCTP_LOC_21);
817 }
818 }
819 }
820 /* if nothing was acked on this destination skip it */
821 if (net->net_ack == 0) {
821 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
822 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
823 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK);
824 }
825 continue;
826 }
827 if (net->net_ack2 > 0) {
828 /*
829 * Karn's rule applies to clearing error count, this
830 * is optional.

--- 14 unchanged lines hidden (view full) ---

845 /*
846 * JRS 5/14/07 - If CMT PF is on and the destination
847 * is in PF state, set the destination to active
848 * state and set the cwnd to one or two MTU's based
849 * on whether PF1 or PF2 is being used.
850 *
851 * Should we stop any running T3 timer here?
852 */
852 if (sctp_cmt_on_off && sctp_cmt_pf && ((net->dest_state & SCTP_ADDR_PF) ==
853 SCTP_ADDR_PF)) {
853 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
854 SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
855 ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
856 net->dest_state &= ~SCTP_ADDR_PF;
855 net->cwnd = net->mtu * sctp_cmt_pf;
857 net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf);
858 SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n",
859 net, net->cwnd);
860 /*
861 * Since the cwnd value is explicitly set,
862 * skip the code that updates the cwnd
863 * value.
864 */
865 goto skip_cwnd_update;

--- 7 unchanged lines hidden (view full) ---

873 * if (sctp_cmt_on_off == 1 &&
874 * net->fast_retran_loss_recovery &&
875 * net->will_exit_fast_recovery == 0) { @@@ Do something }
876 * else if (sctp_cmt_on_off == 0 &&
877 * asoc->fast_retran_loss_recovery && will_exit == 0) {
878 */
879#endif
880
879 if (asoc->fast_retran_loss_recovery && will_exit == 0 && sctp_cmt_on_off == 0) {
881 if (asoc->fast_retran_loss_recovery && will_exit == 0 && SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) {
882 /*
883 * If we are in loss recovery we skip any cwnd
884 * update
885 */
886 goto skip_cwnd_update;
887 }
888 /*
889 * CMT: CUC algorithm. Update cwnd if pseudo-cumack has
890 * moved.
891 */
890 if (accum_moved || (sctp_cmt_on_off && net->new_pseudo_cumack)) {
892 if (accum_moved || (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && net->new_pseudo_cumack)) {
893 /* If the cumulative ack moved we can proceed */
894 if (net->cwnd <= net->ssthresh) {
895 /* We are in slow start */
896 if (net->flight_size + net->net_ack >= net->cwnd) {
897
898 sctp_hs_cwnd_increase(stcb, net);
899
900 } else {
899 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
901 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
902 sctp_log_cwnd(stcb, net, net->net_ack,
903 SCTP_CWND_LOG_NOADV_SS);
904 }
905 }
906 } else {
907 /* We are in congestion avoidance */
908 net->partial_bytes_acked += net->net_ack;
909 if ((net->flight_size + net->net_ack >= net->cwnd) &&
910 (net->partial_bytes_acked >= net->cwnd)) {
911 net->partial_bytes_acked -= net->cwnd;
912 net->cwnd += net->mtu;
911 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
913 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
914 sctp_log_cwnd(stcb, net, net->mtu,
915 SCTP_CWND_LOG_FROM_CA);
916 }
917 } else {
916 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
918 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
919 sctp_log_cwnd(stcb, net, net->net_ack,
920 SCTP_CWND_LOG_NOADV_CA);
921 }
922 }
923 }
924 } else {
923 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
925 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
926 sctp_log_cwnd(stcb, net, net->mtu,
927 SCTP_CWND_LOG_NO_CUMACK);
928 }
929 }
930skip_cwnd_update:
931 /*
932 * NOW, according to Karn's rule do we need to restore the
933 * RTO timer back? Check our net_ack2. If not set then we

--- 214 unchanged lines hidden (view full) ---

1148 /*-
1149 * How to handle these functions?
1150 * if (!tcp_is_cwnd_limited(sk, in_flight)) RRS - good question.
1151 * return;
1152 */
1153 if (net->cwnd <= net->ssthresh) {
1154 /* We are in slow start */
1155 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) {
1156 if (net->net_ack > (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable))) {
1157 net->cwnd += (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable));
1158 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
1159 sctp_log_cwnd(stcb, net, net->mtu,
1160 SCTP_CWND_LOG_FROM_SS);
1161 }
1162 } else {
1163 net->cwnd += net->net_ack;
1162 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
1164 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
1165 sctp_log_cwnd(stcb, net, net->net_ack,
1166 SCTP_CWND_LOG_FROM_SS);
1167 }
1168 }
1169 } else {
1168 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
1170 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
1171 sctp_log_cwnd(stcb, net, net->net_ack,
1172 SCTP_CWND_LOG_NOADV_SS);
1173 }
1174 }
1175 } else {
1176 measure_rtt(stcb, net);
1177
1178 /*

--- 4 unchanged lines hidden (view full) ---

1183 if (((net->partial_bytes_acked / net->mtu * net->htcp_ca.alpha) >> 7) * net->mtu >= net->cwnd) {
1184 /*-
1185 * Does SCTP have a cwnd clamp?
1186 * if (net->snd_cwnd < net->snd_cwnd_clamp) - Nope (RRS).
1187 */
1188 net->cwnd += net->mtu;
1189 net->partial_bytes_acked = 0;
1190 htcp_alpha_update(&net->htcp_ca);
1189 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
1191 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
1192 sctp_log_cwnd(stcb, net, net->mtu,
1193 SCTP_CWND_LOG_FROM_CA);
1194 }
1195 } else {
1196 net->partial_bytes_acked += net->net_ack;
1195 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
1197 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
1198 sctp_log_cwnd(stcb, net, net->net_ack,
1199 SCTP_CWND_LOG_NOADV_CA);
1200 }
1201 }
1202
1203 net->htcp_ca.bytes_acked = net->mtu;
1204 }
1205}

--- 24 unchanged lines hidden (view full) ---

1230 /*
1231 * We take the max of the burst limit times a MTU or the
1232 * INITIAL_CWND. We then limit this to 4 MTU's of sending.
1233 */
1234 net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND));
1235 net->ssthresh = stcb->asoc.peers_rwnd;
1236 htcp_init(stcb, net);
1237
1236 if (sctp_logging_level & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
1238 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
1239 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_INITIALIZATION);
1240 }
1241}
1242
1243void
1244sctp_htcp_cwnd_update_after_sack(struct sctp_tcb *stcb,
1245 struct sctp_association *asoc,
1246 int accum_moved, int reneged_all, int will_exit)

--- 14 unchanged lines hidden (view full) ---

1261 net->fast_recovery_tsn, MAX_TSN) ||
1262 (asoc->last_acked_seq == net->fast_recovery_tsn) ||
1263 compare_with_wrap(net->pseudo_cumack, net->fast_recovery_tsn, MAX_TSN) ||
1264 (net->pseudo_cumack == net->fast_recovery_tsn)) {
1265 net->will_exit_fast_recovery = 1;
1266 }
1267 }
1268#endif
1267 if (sctp_early_fr) {
1269 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
1270 /*
1271 * So, first of all do we need to have a Early FR
1272 * timer running?
1273 */
1274 if (((TAILQ_FIRST(&asoc->sent_queue)) &&
1275 (net->ref_count > 1) &&
1276 (net->flight_size < net->cwnd)) ||
1277 (reneged_all)) {

--- 19 unchanged lines hidden (view full) ---

1297 SCTP_STAT_INCR(sctps_earlyfrstpidsck3);
1298 sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
1299 SCTP_FROM_SCTP_INDATA + SCTP_LOC_21);
1300 }
1301 }
1302 }
1303 /* if nothing was acked on this destination skip it */
1304 if (net->net_ack == 0) {
1303 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
1305 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
1306 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK);
1307 }
1308 continue;
1309 }
1310 if (net->net_ack2 > 0) {
1311 /*
1312 * Karn's rule applies to clearing error count, this
1313 * is optional.

--- 14 unchanged lines hidden (view full) ---

1328 /*
1329 * JRS 5/14/07 - If CMT PF is on and the destination
1330 * is in PF state, set the destination to active
1331 * state and set the cwnd to one or two MTU's based
1332 * on whether PF1 or PF2 is being used.
1333 *
1334 * Should we stop any running T3 timer here?
1335 */
1334 if (sctp_cmt_on_off && sctp_cmt_pf && ((net->dest_state & SCTP_ADDR_PF) ==
1335 SCTP_ADDR_PF)) {
1336 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
1337 SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
1338 ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
1339 net->dest_state &= ~SCTP_ADDR_PF;
1337 net->cwnd = net->mtu * sctp_cmt_pf;
1340 net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf);
1341 SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n",
1342 net, net->cwnd);
1343 /*
1344 * Since the cwnd value is explicitly set,
1345 * skip the code that updates the cwnd
1346 * value.
1347 */
1348 goto skip_cwnd_update;

--- 7 unchanged lines hidden (view full) ---

1356 * if (sctp_cmt_on_off == 1 &&
1357 * net->fast_retran_loss_recovery &&
1358 * net->will_exit_fast_recovery == 0) { @@@ Do something }
1359 * else if (sctp_cmt_on_off == 0 &&
1360 * asoc->fast_retran_loss_recovery && will_exit == 0) {
1361 */
1362#endif
1363
1361 if (asoc->fast_retran_loss_recovery && will_exit == 0 && sctp_cmt_on_off == 0) {
1364 if (asoc->fast_retran_loss_recovery && will_exit == 0 && SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) {
1365 /*
1366 * If we are in loss recovery we skip any cwnd
1367 * update
1368 */
1369 goto skip_cwnd_update;
1370 }
1371 /*
1372 * CMT: CUC algorithm. Update cwnd if pseudo-cumack has
1373 * moved.
1374 */
1372 if (accum_moved || (sctp_cmt_on_off && net->new_pseudo_cumack)) {
1375 if (accum_moved || (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && net->new_pseudo_cumack)) {
1376 htcp_cong_avoid(stcb, net);
1377 measure_achieved_throughput(stcb, net);
1378 } else {
1376 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
1379 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
1380 sctp_log_cwnd(stcb, net, net->mtu,
1381 SCTP_CWND_LOG_NO_CUMACK);
1382 }
1383 }
1384skip_cwnd_update:
1385 /*
1386 * NOW, according to Karn's rule do we need to restore the
1387 * RTO timer back? Check our net_ack2. If not set then we

--- 19 unchanged lines hidden (view full) ---

1407{
1408 struct sctp_nets *net;
1409
1410 /*
1411 * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off == 1) &&
1412 * (net->fast_retran_loss_recovery == 0)))
1413 */
1414 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
1412 if ((asoc->fast_retran_loss_recovery == 0) || (sctp_cmt_on_off == 1)) {
1415 if ((asoc->fast_retran_loss_recovery == 0) || (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 1)) {
1416 /* out of a RFC2582 Fast recovery window? */
1417 if (net->net_ack > 0) {
1418 /*
1419 * per section 7.2.3, are there any
1420 * destinations that had a fast retransmit
1421 * to them. If so what we need to do is
1422 * adjust ssthresh and cwnd.
1423 */
1424 struct sctp_tmit_chunk *lchk;
1425 int old_cwnd = net->cwnd;
1426
1427 /* JRS - reset as if state were changed */
1428 htcp_reset(&net->htcp_ca);
1429 net->ssthresh = htcp_recalc_ssthresh(stcb, net);
1430 net->cwnd = net->ssthresh;
1428 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
1431 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
1432 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd),
1433 SCTP_CWND_LOG_FROM_FR);
1434 }
1435 lchk = TAILQ_FIRST(&asoc->send_queue);
1436
1437 net->partial_bytes_acked = 0;
1438 /* Turn on fast recovery window */
1439 asoc->fast_retran_loss_recovery = 1;

--- 45 unchanged lines hidden (view full) ---

1485{
1486 int old_cwnd = net->cwnd;
1487
1488 /* JRS - reset as if the state were being changed to timeout */
1489 htcp_reset(&net->htcp_ca);
1490 net->ssthresh = htcp_recalc_ssthresh(stcb, net);
1491 net->cwnd = net->mtu;
1492 net->partial_bytes_acked = 0;
1490 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
1493 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
1494 sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX);
1495 }
1496}
1497
1498void
1499sctp_htcp_cwnd_update_after_fr_timer(struct sctp_inpcb *inp,
1500 struct sctp_tcb *stcb, struct sctp_nets *net)
1501{

--- 7 unchanged lines hidden (view full) ---

1509 * make a small adjustment to cwnd and force to CA.
1510 */
1511 if (net->cwnd > net->mtu)
1512 /* drop down one MTU after sending */
1513 net->cwnd -= net->mtu;
1514 if (net->cwnd < net->ssthresh)
1515 /* still in SS move to CA */
1516 net->ssthresh = net->cwnd - 1;
1514 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
1517 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
1518 sctp_log_cwnd(stcb, net, (old_cwnd - net->cwnd), SCTP_CWND_LOG_FROM_FR);
1519 }
1520}
1521
1522void
1523sctp_htcp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb,
1524 struct sctp_nets *net)
1525{

--- 6 unchanged lines hidden (view full) ---

1532 SCTP_STAT_INCR(sctps_ecnereducedcwnd);
1533 net->ssthresh = htcp_recalc_ssthresh(stcb, net);
1534 if (net->ssthresh < net->mtu) {
1535 net->ssthresh = net->mtu;
1536 /* here back off the timer as well, to slow us down */
1537 net->RTO <<= 1;
1538 }
1539 net->cwnd = net->ssthresh;
1537 if (sctp_logging_level & SCTP_CWND_MONITOR_ENABLE) {
1540 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
1541 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT);
1542 }
1543}