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FreeBSD TCP retransmissions
- From: Matt Jerdonek <maj1224 at yahoo dot com>
- To: Patches eCos <ecos-patches at sources dot redhat dot com>
- Date: Tue, 28 Oct 2003 09:36:48 -0800 (PST)
- Subject: FreeBSD TCP retransmissions
Attached patch implements tcp_rexmit_min (copied from
FreeBSD) and tcp_rexmit_shift_max (no FreeBSD support.
Originated by me).
///////////////////////////////////////////
SYSCTL output
INFO:<4 2 6 107 = net.inet.tcp.newreno (INT Read Write
){6}>
INFO:<4 2 6 108 = net.inet.tcp.msl (INT Read Write
){6}>
INFO:<4 2 6 109 = net.inet.tcp.always_keepalive (INT
Read Write ){6}>
INFO:<4 2 6 110 = net.inet.tcp.rexmit_min (INT Read
Write ){6}>
INFO:<4 2 6 111 = net.inet.tcp.rexmit_shift_max (INT
Read Write ){6}>
INFO:<4 2 6 112 = net.inet.tcp.tcbhashsize (INT Read
){6}>
INFO:<4 2 6 113 = net.inet.tcp.do_tcpdrain (INT Read
Write ){6}>
INFO:<4 2 6 114 = net.inet.tcp.pcbcount (INT Read
){6}>
INFO:<4 2 6 115 = net.inet.tcp.icmp_may_rst (INT Read
Write ){6}>
INFO:<4 2 6 116 = net.inet.tcp.strict_rfc1948 (INT
Read Write ){6}>
INFO:<4 2 6 117 = net.inet.tcp.isn_reseed_interval
(INT Read Write ){6}>
////////////////////////////////////////////////////////////////
eCos
i386-elf:(~/ecos/packages/net/bsd_tcpip/current/include/netinet)cvs
diff tcp_timer.h
Index: tcp_timer.h
===================================================================
RCS file:
/ienrcs/cvsintact/ecos/packages/net/bsd_tcpip/current/include/netinet/tcp_timer.h,v
retrieving revision 1.1
diff -r1.1 tcp_timer.h
147a148,149
> extern int tcp_rexmit_min; /* min time between
retransmissions */
> extern int tcp_rexmit_shift_max; /* maximum
retransmission attempts */
eCos
i386-elf:(~/ecos/packages/net/bsd_tcpip/current/include/netinet)
//////////////////////////////////////////////////////////////////
eCos
i386-elf:(~/ecos/packages/net/bsd_tcpip/current/src/sys/netinet)cvs
diff tcp_output.c
Index: tcp_output.c
===================================================================
RCS file:
/ienrcs/cvsintact/ecos/packages/net/bsd_tcpip/current/src/sys/netinet/tcp_output.c,v
retrieving revision 1.2
diff -r1.2 tcp_output.c
946c946
< if (tp->t_rxtshift < TCP_MAXRXTSHIFT)
---
> if (tp->t_rxtshift < tcp_rexmit_shift_max)
////////////////////////////////////////////////////////////////////
eCos
i386-elf:(~/ecos/packages/net/bsd_tcpip/current/src/sys/netinet)cvs
diff tcp_subr.c
Index: tcp_subr.c
===================================================================
RCS file:
/ienrcs/cvsintact/ecos/packages/net/bsd_tcpip/current/src/sys/netinet/tcp_subr.c,v
retrieving revision 1.2
diff -r1.2 tcp_subr.c
155c155
<
---
>
207a208
> tcp_rexmit_min = TCPTV_MIN;
547c548
< tp->t_rttmin = TCPTV_MIN;
---
> tp->t_rttmin = tcp_rexmit_min;
eCos
i386-elf:(~/ecos/packages/net/bsd_tcpip/current/src/sys/netinet)
////////////////////////////////////////////////////////////////////
eCos
i386-elf:(~/ecos/packages/net/bsd_tcpip/current/src/sys/netinet)cvs
diff tcp_timer.c
Index: tcp_timer.c
===================================================================
RCS file:
/ienrcs/cvsintact/ecos/packages/net/bsd_tcpip/current/src/sys/netinet/tcp_timer.c,v
retrieving revision 1.2
diff -r1.2 tcp_timer.c
103a104,123
> static int
> sysctl_rexmitmax_rangecheck(SYSCTL_HANDLER_ARGS)
> {
> int error, tt;
>
> tt = *(int *)oidp->oid_arg1;
>
> error = sysctl_handle_int(oidp, &tt, 0, req);
> if (error || !req->newptr)
> return (error);
>
> if (tt > TCP_MAXRXTSHIFT)
> return (EINVAL);
>
> if (tt < 2)
> return (EINVAL);
>
> *(int *)oidp->oid_arg1 = tt;
> return (0);
> }
128a149,156
>
> int tcp_rexmit_min;
> SYSCTL_PROC(_net_inet_tcp, OID_AUTO, rexmit_min,
CTLTYPE_INT|CTLFLAG_RW,
> &tcp_rexmit_min, 0, sysctl_msec_to_ticks, "I",
"Minimum retransmission timeout");
>
> int tcp_rexmit_shift_max = TCP_MAXRXTSHIFT;
> SYSCTL_PROC(_net_inet_tcp, OID_AUTO,
rexmit_shift_max, CTLTYPE_INT|CTLFLAG_RW,
> &tcp_rexmit_shift_max, 0,
sysctl_rexmitmax_rangecheck, "I", "Maximum TCP
retransmissions");
340c368
< if (tp->t_rxtshift == TCP_MAXRXTSHIFT &&
---
> if (tp->t_rxtshift == tcp_rexmit_shift_max &&
384,385c412,413
< if (++tp->t_rxtshift > TCP_MAXRXTSHIFT) {
< tp->t_rxtshift = TCP_MAXRXTSHIFT;
---
> if (++tp->t_rxtshift > tcp_rexmit_shift_max) {
> tp->t_rxtshift = tcp_rexmit_shift_max;
429c457
< if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) {
---
> if (tp->t_rxtshift > tcp_rexmit_shift_max / 4)
{
eCos
i386-elf:(~/ecos/packages/net/bsd_tcpip/current/src/sys/netinet)
//////////////////////////////////////////////////////////////////////////
eCos
i386-elf:(~/ecos/packages/net/bsd_tcpip/current)cvs
diff ChangeLog
Index: ChangeLog
===================================================================
RCS file:
/ienrcs/cvsintact/ecos/packages/net/bsd_tcpip/current/ChangeLog,v
retrieving revision 1.1
diff -r1.1 ChangeLog
0a1,12
> 2003-10-28 Matt Jerdonek <maj1224@yahoo.com>
>
> * src/sys/netinet/tcp_output.c
(tcp_setpersist): Use variable
> tcp_rexmit_shift_max instead of
TCP_MAXRXTSHIFT
> * src/sys/netinet/tcp_subr.c (tcp_newtcpcb):
Add FreeBSD
> changes to control minimum retransmit time
> * src/sys/netinet/tcp_timer.c : Use variable
tcp_rexmit_shift_max
> instead of TCP_MAXRXTSHIFT. Also add FreeBSD
changes to control
> minimum retransmit time
> * include/netinet/tcp_timer.h : Add external
declarations to
> support above.
>
eCos i386-elf:(~/ecos/packages/net/bsd_tcpip/current)
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