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 $");
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)) {
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)) {
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;
--- 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) {
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) {
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)) {
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;
--- 7 unchanged lines hidden (view full) ---
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 }
325skip_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
--- 17 unchanged lines hidden (view full) ---
346sctp_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
359void
360sctp_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
377void
378sctp_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)
--- 92 unchanged lines hidden (view full) ---
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
488void
489sctp_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
503void
504sctp_cwnd_update_after_fr_timer(struct sctp_inpcb *inp,
505 struct sctp_tcb *stcb, struct sctp_nets *net)
506{
--- 4 unchanged lines hidden (view full) ---
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
524struct sctp_hs_raise_drop {
525 int32_t cwnd;
526 int32_t increase;
527 int32_t drop_percent;
--- 86 unchanged lines hidden (view full) ---
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
647static void
648sctp_hs_cwnd_decrease(struct sctp_tcb *stcb, struct sctp_nets *net)
649{
--- 25 unchanged lines hidden (view full) ---
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
688void
689sctp_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 */
--- 69 unchanged lines hidden (view full) ---
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)) {
--- 19 unchanged lines hidden (view full) ---
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.
--- 14 unchanged lines hidden (view full) ---
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;
--- 7 unchanged lines hidden (view full) ---
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 }
928skip_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
--- 214 unchanged lines hidden (view full) ---
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 /*
--- 4 unchanged lines hidden (view full) ---
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}
--- 24 unchanged lines hidden (view full) ---
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
1241void
1242sctp_htcp_cwnd_update_after_sack(struct sctp_tcb *stcb,
1243 struct sctp_association *asoc,
1244 int accum_moved, int reneged_all, int will_exit)
--- 14 unchanged lines hidden (view full) ---
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)) {
--- 19 unchanged lines hidden (view full) ---
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.
--- 14 unchanged lines hidden (view full) ---
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;
--- 7 unchanged lines hidden (view full) ---
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 }
1381skip_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
--- 19 unchanged lines hidden (view full) ---
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;
--- 45 unchanged lines hidden (view full) ---
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
1495void
1496sctp_htcp_cwnd_update_after_fr_timer(struct sctp_inpcb *inp,
1497 struct sctp_tcb *stcb, struct sctp_nets *net)
1498{
--- 7 unchanged lines hidden (view full) ---
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
1519void
1520sctp_htcp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb,
1521 struct sctp_nets *net)
1522{
--- 6 unchanged lines hidden (view full) ---
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}
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 $");
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)) {
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)) {
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;
--- 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) {
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) {
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)) {
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;
--- 7 unchanged lines hidden (view full) ---
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 }
325skip_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
--- 17 unchanged lines hidden (view full) ---
346sctp_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
359void
360sctp_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
377void
378sctp_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)
--- 92 unchanged lines hidden (view full) ---
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
488void
489sctp_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
503void
504sctp_cwnd_update_after_fr_timer(struct sctp_inpcb *inp,
505 struct sctp_tcb *stcb, struct sctp_nets *net)
506{
--- 4 unchanged lines hidden (view full) ---
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
524struct sctp_hs_raise_drop {
525 int32_t cwnd;
526 int32_t increase;
527 int32_t drop_percent;
--- 86 unchanged lines hidden (view full) ---
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
647static void
648sctp_hs_cwnd_decrease(struct sctp_tcb *stcb, struct sctp_nets *net)
649{
--- 25 unchanged lines hidden (view full) ---
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
688void
689sctp_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 */
--- 69 unchanged lines hidden (view full) ---
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)) {
--- 19 unchanged lines hidden (view full) ---
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.
--- 14 unchanged lines hidden (view full) ---
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;
--- 7 unchanged lines hidden (view full) ---
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 }
928skip_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
--- 214 unchanged lines hidden (view full) ---
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 /*
--- 4 unchanged lines hidden (view full) ---
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}
--- 24 unchanged lines hidden (view full) ---
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
1241void
1242sctp_htcp_cwnd_update_after_sack(struct sctp_tcb *stcb,
1243 struct sctp_association *asoc,
1244 int accum_moved, int reneged_all, int will_exit)
--- 14 unchanged lines hidden (view full) ---
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)) {
--- 19 unchanged lines hidden (view full) ---
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.
--- 14 unchanged lines hidden (view full) ---
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;
--- 7 unchanged lines hidden (view full) ---
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 }
1381skip_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
--- 19 unchanged lines hidden (view full) ---
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;
--- 45 unchanged lines hidden (view full) ---
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
1495void
1496sctp_htcp_cwnd_update_after_fr_timer(struct sctp_inpcb *inp,
1497 struct sctp_tcb *stcb, struct sctp_nets *net)
1498{
--- 7 unchanged lines hidden (view full) ---
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
1519void
1520sctp_htcp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb,
1521 struct sctp_nets *net)
1522{
--- 6 unchanged lines hidden (view full) ---
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}