diff options
| author | tuexen <tuexen@FreeBSD.org> | 2010-12-22 19:04:14 +0000 |
|---|---|---|
| committer | tuexen <tuexen@FreeBSD.org> | 2010-12-22 19:04:14 +0000 |
| commit | 0826d29a2d8e53cc3f8de837cc3646c464f5cd20 (patch) | |
| tree | 9c25fb3791f1ee5c0580c783b9635aec84319691 /sys/netinet/sctp_cc_functions.c | |
| parent | 74fe88a37c5c61c7306bdbd9e13ee54a060b18c4 (diff) | |
| download | FreeBSD-src-0826d29a2d8e53cc3f8de837cc3646c464f5cd20.zip FreeBSD-src-0826d29a2d8e53cc3f8de837cc3646c464f5cd20.tar.gz | |
Provide a possibility to configure the inital congestion window to the
value defined in RFC 4960.
MFC after: 3 months.
Diffstat (limited to 'sys/netinet/sctp_cc_functions.c')
| -rw-r--r-- | sys/netinet/sctp_cc_functions.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/sys/netinet/sctp_cc_functions.c b/sys/netinet/sctp_cc_functions.c index c7a2415..fc8811b 100644 --- a/sys/netinet/sctp_cc_functions.c +++ b/sys/netinet/sctp_cc_functions.c @@ -53,15 +53,19 @@ sctp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net) uint32_t cwnd_in_mtu; assoc = &stcb->asoc; - /* - * We take the minimum of the burst limit and the initial congestion - * window. The initial congestion window is at least two times the - * MTU. - */ cwnd_in_mtu = SCTP_BASE_SYSCTL(sctp_initial_cwnd); - if ((assoc->max_burst > 0) && (cwnd_in_mtu > assoc->max_burst)) - cwnd_in_mtu = assoc->max_burst; - net->cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu; + if (cwnd_in_mtu == 0) { + /* Using 0 means that the value of RFC 4960 is used. */ + net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND)); + } else { + /* + * We take the minimum of the burst limit and the initial + * congestion window. + */ + if ((assoc->max_burst > 0) && (cwnd_in_mtu > assoc->max_burst)) + cwnd_in_mtu = assoc->max_burst; + net->cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu; + } net->ssthresh = assoc->peers_rwnd; SDT_PROBE(sctp, cwnd, net, init, |
