src/sys/modules/khelp, branch releng/14.3

sys: Remove $FreeBSD$: one-line sh pattern

2023-08-16T17:54:58+00:00

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

tcp: fix build issue for some cc modules

2023-07-13T16:56:25+00:00

The TCP_HHOOK option was moved from opt_inet.h to opt_global.h in
https://cgit.FreeBSD.org/src/commit/?id=e68b3792440cac248347afe08ba5881a00ba6523
The corresponding changes in two Makefiles were missed, which resulted
in not building cc_cdg, cc_chd, cc_hd, and cc_vegas anymore.

Reported by:		void@f-m.fm
Reviewed by:		rrs, rscheff
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D41010

modules: a lot: need opt_kern_tls.h

2021-09-30T04:10:31+00:00

This fixes the standalone build.

sys/modules: normalize .CURDIR-relative paths to SRCTOP

2017-03-04T10:10:17+00:00

This simplifies make output/logic

Tested with:	`cd sys/modules; make ALL_MODULES=` on amd64
MFC after:	1 month
Sponsored by:	Dell EMC Isilon

In the TCP stack, the hhook(9) framework provides hooks for kernel modules

2016-10-12T02:16:42+00:00

to add actions that run when a TCP frame is sent or received on a TCP
session in the ESTABLISHED state. In the base tree, this functionality is
only used for the h_ertt module, which is used by the cc_cdg, cc_chd, cc_hd,
and cc_vegas congestion control modules.

Presently, we incur overhead to check for hooks each time a TCP frame is
sent or received on an ESTABLISHED TCP session.

This change adds a new compile-time option (TCP_HHOOK) to determine whether
to include the hhook(9) framework for TCP. To retain backwards
compatibility, I added the TCP_HHOOK option to every configuration file that
already defined "options INET". (Therefore, this patch introduces no
functional change. In order to see a functional difference, you need to
compile a custom kernel without the TCP_HHOOK option.) This change will
allow users to easily exclude this functionality from their kernel, should
they wish to do so.

Note that any users who use a custom kernel configuration and use one of the
congestion control modules listed above will need to add the TCP_HHOOK
option to their kernel configuration.

Reviewed by:	rrs, lstewart, hiren (previous version), sjg (makefiles only)
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D8185

Remove unnecessary inclusions of bsd.own.mk.

2014-08-04T22:34:12+00:00

Import the ERTT (Enhanced Round Trip Time) Khelp module. ERTT uses the

2011-01-24T23:08:38+00:00

Khelp/Hhook KPIs to hook into the TCP stack and maintain a per-connection, low
noise estimate of the instantaneous RTT. ERTT's implementation is robust even in
the face of delayed acknowledgements and/or TSO being in use for a connection.

A high quality, low noise RTT estimate is a requirement for applications such as
delay-based congestion control, for which we will be importing some algorithm
implementations shortly.

In collaboration with:	David Hayes  and
				Grenville Armitage 
Sponsored by:	FreeBSD Foundation
Reviewed by:	bz and others along the way
MFC after:	3 months

Add build infrastructure for Khelp modules.

2011-01-24T07:50:29+00:00

Sponsored by:	FreeBSD Foundation
Reviewed by:	bz
MFC after:	3 months