$Id$ -> $FreeBSD$

Add sysctl descriptions to many SYSCTL_XXXs

PR: kern/11197
Submitted by: Adrian Chadd <adrian@FreeBSD.org>
Reviewed by: billf(spelling/style/minor nits)
Looked at by: bde(style)

Converted the last instance of hzto() to tvtohz().

Eradicate the variable "time" from the kernel, using various measures.
"time" wasn't a atomic variable, so splfoo() protection were needed
around any access to it, unless you just wanted the seconds

Eradicate the variable "time" from the kernel, using various measures.
"time" wasn't a atomic variable, so splfoo() protection were needed
around any access to it, unless you just wanted the seconds part.

Most uses of time.tv_sec now uses the new variable time_second instead.

gettime() changed to getmicrotime(0.

Remove a couple of unneeded splfoo() protections, the new getmicrotime()
is atomic, (until Bruce sets a breakpoint in it).

A couple of places needed random data, so use read_random() instead
of mucking about with time which isn't random.

Add a new nfs_curusec() function.

Mark a couple of bogosities involving the now disappeard time variable.

Update ffs_update() to avoid the weird "== &time" checks, by fixing the
one remaining call that passwd &time as args.

Change profiling in ncr.c to use ticks instead of time. Resolution is
the same.

Add new function "tvtohz()" to avoid the bogus "splfoo(), add time, call
hzto() which subtracts time" sequences.

Reviewed by: bde

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A fix for a link down route cleanup panic, when the route cleanup
pulls the rug out from underneath itself.

Obtained from: wollman (a few months ago, I've been using this for ages)

Back out DIAGNOSTIC changes.

Turn DIAGNOSTIC into a new-style option.

Removed unused #includes.

Fix the mechanism for choosing wehether to save the slow-start threshold
in the route. This allows us to remove the unconditional setting of the
pipesize in the route, which should mean that SO_SNDB

Fix the mechanism for choosing wehether to save the slow-start threshold
in the route. This allows us to remove the unconditional setting of the
pipesize in the route, which should mean that SO_SNDBUF and SO_RCVBUF
should actually work again. While we're at it:

- Convert udp_usrreq from `mondo switch statement from Hell' to new-style.
- Delete old TCP mondo switch statement from Hell, which had previously
been diked out.

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Provide PRC_IFDOWN and PRC_IFUP support for IP. Now, when an interface
is administratively downed, all routes to that interface (including the
interface route itself) which are not static will be de

Provide PRC_IFDOWN and PRC_IFUP support for IP. Now, when an interface
is administratively downed, all routes to that interface (including the
interface route itself) which are not static will be deleted. When
it comes back up, and addresses remaining will have their interface routes
re-added. This solves the problem where, for example, an Ethernet interface
is downed by traffic continues to flow by way of ARP entries.

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Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

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Put the 'debug' messages of the type:
/kernel: in_rtqtimo: adjusted rtq_reallyold to 1066
/kernel: in_rtqtimo: adjusted rtq_reallyold to 710
inside of #ifdef DIAGNOSTIC to avoid the support quest

Put the 'debug' messages of the type:
/kernel: in_rtqtimo: adjusted rtq_reallyold to 1066
/kernel: in_rtqtimo: adjusted rtq_reallyold to 710
inside of #ifdef DIAGNOSTIC to avoid the support questions from folks
asking what this means.

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Add three new route flags to help determine what sort of address
the destination represents. For IP:

- Iff it is a host route, RTF_LOCAL and RTF_BROADCAST indicate local
(belongs to this host) an

Add three new route flags to help determine what sort of address
the destination represents. For IP:

- Iff it is a host route, RTF_LOCAL and RTF_BROADCAST indicate local
(belongs to this host) and broadcast addresses, respectively.

- For all routes, RTF_MULTICAST is set if the destination is multicast.

The RTF_BROADCAST flag is used by ip_output() to eliminate a call to
in_broadcast() in a common case; this gives about 1% in our packet-generation
experiments. All three flags might be used (although they aren't now)
to determine whether a packet can be forwarded; a given host route can
represent a forwardable address if:

(rt->rt_flags & (RTF_HOST | RTF_LOCAL | RTF_BROADCAST | RTF_MULTICAST))
== RTF_HOST

Obviously, one still has to do all the work if a host route is not present,
but this code allows one to cache the results of such a lookup if rtalloc1()
is called without masking RTF_PRCLONING.

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Delete #if 0 block containing remnants of pre-MTU discovery rmx_mtu
initialization.

First piece of fixing ppp/proxy arp problem:

If an attempt to add a route fails because an "ARP table" entry is in
the way, remove the ARP entry and retry the add.

Reviewed by: nate

Actually call in_rtqdrain()as was originally intended.

Path MTU Discovery is now standard.

Completed function declarations and/or added prototypes.

New style sysctl & staticize alot of stuff.

Start adding new style sysctl here too.

Second batch of cleanup changes.
This time mostly making a lot of things static and some unused
variables here and there.

Initial back-end support for IP MTU discovery, gated on MTUDISC. The support
for TCP has yet to be written.

tcp_input.c - keep track of how many times a route contained a cached rtt
or ssthresh that we were able to use

tcp_var.h - declare tcpstat entries for above; declare tcp_{send,recv}space

in_rmx.c

tcp_input.c - keep track of how many times a route contained a cached rtt
or ssthresh that we were able to use

tcp_var.h - declare tcpstat entries for above; declare tcp_{send,recv}space

in_rmx.c - fill in the MTU and pipe sizes with the defaults TCP would have
used anyway in the absence of values here

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Fix an error in the comparison direction of the ap->updating case of
in_rtqkill().

Submitted by: W. Richard Stevens

Remove trailing whitespace.