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