Date: Sat, 28 May 2011 04:40:35 +0000 (UTC) From: Lawrence Stewart <lstewart@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/conf files src/sys/netinet cc.h tcp_input.c tcp_output.c tcp_sack.c tcp_subr.c tcp_timer.c tcp_usrreq.c tcp_var.h src/sys/netinet/cc cc.c cc_module.h cc_newreno.c src/sys/sys param.h Message-ID: <201105280441.p4S4f28O086793@repoman.freebsd.org>
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lstewart 2011-05-28 04:40:35 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_8)
sys/conf files
sys/netinet tcp_input.c tcp_output.c tcp_sack.c
tcp_subr.c tcp_timer.c tcp_usrreq.c
tcp_var.h
sys/sys param.h
Added files: (Branch: RELENG_8)
sys/netinet cc.h
sys/netinet/cc cc.c cc_module.h cc_newreno.c
Log:
SVN rev 222401 on 2011-05-28 04:40:35Z by lstewart
MFC r215166,215377,215391,215392,215393,215395,216101,216103,216105,216107,
216749,216760,217748,218167:
- Add a KPI and supporting infrastructure to allow modular congestion control
algorithms to be used in the net stack. Algorithms can maintain per-connection
state if required, and connections maintain their own algorithm pointer, which
allows different connections to concurrently use different algorithms. The
TCP_CONGESTION socket option can be used with getsockopt()/setsockopt() to
programmatically query or change the congestion control algorithm respectively
from within an application at runtime.
- Integrate the framework with the TCP stack in as least intrusive a manner as
possible. Care was also taken to develop the framework in a way that should
allow integration with other congestion aware transport protocols (e.g. SCTP)
in the future. The hope is that we will one day be able to share a single set
of congestion control algorithm modules between all congestion aware transport
protocols.
- Introduce a new congestion recovery (TF_CONGRECOVERY) state into the TCP stack
and use it to decouple the meaning of recovery from a congestion event and
recovery from packet loss (TF_FASTRECOVERY) a la RFC2581. ECN and delay based
congestion control protocols don't generally need to recover from packet loss
and need a different way to note a congestion recovery episode within the
stack.
- Remove the net.inet.tcp.newreno sysctl, which simplifies some portions of code
and ensures the stack always uses the appropriate mechanisms for recovering
from packet loss during a congestion recovery episode.
- Extract the NewReno congestion control algorithm from the TCP stack and
massage it into module form. NewReno is always built into the kernel and will
remain the default algorithm for the forseeable future. Implementations of
additional different algorithms will become available in the near future.
- Tweak the MFCed code to preserve the ABI of the 8-STABLE branch with respect
to "struct tcpcb" by consuming some of the padding within the struct.
- Bump __FreeBSD_version to 802504.
In collaboration with: David Hayes <dahayes at swin edu au> and
Grenville Armitage <garmitage at swin edu au>
Sponsored by: Cisco URP, FreeBSD Foundation
Reviewed by: rpaulo (r215166), bz (r215391,215395,216749,217748)
Tested by: David Hayes (r215166), trociny (r215377,215391,215392,215395)
Revision Changes Path
1.1459.2.59 +2 -0 src/sys/conf/files
1.5.2.2 +166 -0 src/sys/netinet/cc.h (new)
1.8.2.2 +325 -0 src/sys/netinet/cc/cc.c (new)
1.2.2.2 +70 -0 src/sys/netinet/cc/cc_module.h (new)
1.5.2.2 +236 -0 src/sys/netinet/cc/cc_newreno.c (new)
1.411.2.12 +256 -238 src/sys/netinet/tcp_input.c
1.164.2.9 +19 -40 src/sys/netinet/tcp_output.c
1.53.2.3 +1 -1 src/sys/netinet/tcp_sack.c
1.350.2.14 +92 -2 src/sys/netinet/tcp_subr.c
1.112.2.4 +11 -38 src/sys/netinet/tcp_timer.c
1.192.2.7 +61 -1 src/sys/netinet/tcp_usrreq.c
1.182.2.12 +26 -6 src/sys/netinet/tcp_var.h
1.433.2.16 +1 -1 src/sys/sys/param.h
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