freebsd-dev/sys/modules/khelp/Makefile

# $FreeBSD$

SUBDIR=	

# Do we have the TCP_HHOOK symbol defined? If not, there is no point in
# building this modules by default.
# We will default to building this module unless $OPT_INET is defined
# and does not contain the TCP_HHOOK option.
.if defined(ALL_MODULES) || ${OPT_INET:UTCP_HHOOK:MTCP_HHOOK} != ""
SUBDIR+=	h_ertt
.endif

.include <bsd.subdir.mk>
Add build infrastructure for Khelp modules. Sponsored by: FreeBSD Foundation Reviewed by: bz MFC after: 3 months 2011-01-24 07:50:29 +00:00			`# $FreeBSD$`

In the TCP stack, the hhook(9) framework provides hooks for kernel modules 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 2016-10-12 02:16:42 +00:00			`SUBDIR=`

			`# Do we have the TCP_HHOOK symbol defined? If not, there is no point in`
			`# building this modules by default.`
			`# We will default to building this module unless $OPT_INET is defined`
			`# and does not contain the TCP_HHOOK option.`
			`.if defined(ALL_MODULES) \|\| ${OPT_INET:UTCP_HHOOK:MTCP_HHOOK} != ""`
			`SUBDIR+= h_ertt`
			`.endif`
Add build infrastructure for Khelp modules. Sponsored by: FreeBSD Foundation Reviewed by: bz MFC after: 3 months 2011-01-24 07:50:29 +00:00
			`.include <bsd.subdir.mk>`