$NetBSD: tcp_congctl.9,v 1.4 2008/04/30 13:10:58 martin Exp $
Copyright (c) 2006 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by Rui Paulo.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd October 15, 2006 .Dt TCP_CONGCTL 9 .Os .Sh NAME .Nm tcp_congctl .Nd TCP congestion control API .Sh SYNOPSIS n netinet/tcp_congctl.h
.Ft int .Fn tcp_congctl_register "const char *" "struct tcp_congctl *"
.Ft int .Fn tcp_congctl_unregister "const char *"
.Sh DESCRIPTION The .Nm tcp_congctrl API is used to add or remove TCP congestion control algorithms on-the-fly and to modularize them. It includes basically two functions: l -tag -width "xxxxx" t Fn tcp_congctl_register "const char *" "struct tcp_congctl *" Registers a new congestion control algorithm. The .Fa struct tcp_congctl argument must contain a list of callbacks like the following: d -literal -offset indent struct tcp_congctl { int (*fast_retransmit)(struct tcpcb *, struct tcphdr *); void (*slow_retransmit)(struct tcpcb *); void (*fast_retransmit_newack)(struct tcpcb *, struct tcphdr *); void (*newack)(struct tcpcb *, struct tcphdr *); void (*cong_exp)(struct tcpcb *); }; .Ed t Fn tcp_congctl_unregister "const char *" If found, unregister the selected TCP congestion control algorithm. .El .Sh RETURN VALUES .Fn tcp_congctl_register and .Fn tcp_congctl_unregister both return .Dv 0 when there is no error. If the name is already registered, .Fn tcp_congctl_register will return .Er EEXIST . .Fn tcp_congctl_unregister can return .Er ENOENT if there is no congestion control algorithm by that name and can return .Er EBUSY if the matched algorithm is being used by userspace applications. .Sh FILES Implementation is in
Copyright (c) 2006 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by Rui Paulo.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd October 15, 2006 .Dt TCP_CONGCTL 9 .Os .Sh NAME .Nm tcp_congctl .Nd TCP congestion control API .Sh SYNOPSIS n netinet/tcp_congctl.h
.Ft int .Fn tcp_congctl_register "const char *" "struct tcp_congctl *"
.Ft int .Fn tcp_congctl_unregister "const char *"
.Sh DESCRIPTION The .Nm tcp_congctrl API is used to add or remove TCP congestion control algorithms on-the-fly and to modularize them. It includes basically two functions: l -tag -width "xxxxx" t Fn tcp_congctl_register "const char *" "struct tcp_congctl *" Registers a new congestion control algorithm. The .Fa struct tcp_congctl argument must contain a list of callbacks like the following: d -literal -offset indent struct tcp_congctl { int (*fast_retransmit)(struct tcpcb *, struct tcphdr *); void (*slow_retransmit)(struct tcpcb *); void (*fast_retransmit_newack)(struct tcpcb *, struct tcphdr *); void (*newack)(struct tcpcb *, struct tcphdr *); void (*cong_exp)(struct tcpcb *); }; .Ed t Fn tcp_congctl_unregister "const char *" If found, unregister the selected TCP congestion control algorithm. .El .Sh RETURN VALUES .Fn tcp_congctl_register and .Fn tcp_congctl_unregister both return .Dv 0 when there is no error. If the name is already registered, .Fn tcp_congctl_register will return .Er EEXIST . .Fn tcp_congctl_unregister can return .Er ENOENT if there is no congestion control algorithm by that name and can return .Er EBUSY if the matched algorithm is being used by userspace applications. .Sh FILES Implementation is in
a sys/netinet/tcp_congctl.c and the interface is in
a sys/netinet/tcp_congctl.h . .Sh SEE ALSO .Xr tcp 4
Indexes created Sat Sep 20 22:09:52 GMT 2025