Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Node constructor methods are supposed to be called in syscall
context always. Convert nodes to consistently use M_WAITOK flag
for memory allocation.

Reviewed by: julian

Add XMIT_FAILOVER transmit algorithm to ng_one2many node. Packets are
delivered out the first active "many" hook.

PR: kern/137775
Submitted by: Maxim Ignatenko
MFC after: 2 weeks

Retire the MALLOC and FREE macros. They are an abomination unto style(9).

MFC after: 3 months

Fix getting stats from many links with index > 0.

Submitted by: Richard Kojedzinszky
MFC after: 3 days

/* -> /*- for license, minor formatting changes

Introduce new failure detection algorithm, called NG_ONE2MANY_FAIL_NOTIFY.
It means, that node listens to flow control messages from downstreams
and removes link from list of active links whenever a LINK_IS_DOWN message
is received. If LINK_IS_UP message is received, then links is put
back into list of active links.

Approved by: julian (mentor), implicitly
MFC after: 1 week

Remove unused macro.

Approved by: julian (mentor)

Having moved metadata usage to mbuf tags, remove code that supports
the old way of doing it.

Submitted by: Gleb Smirnoff <glebius@cell.sick.ru>

Switch to using C99 sparse initialisers for the type methods array.
Should make no binary difference.

Submitted by: Gleb Smirnoff <glebius@cell.sick.ru>
Reviewed by: Harti Brandt <harti@freebsd.org>
MFC after: 1 week

Backout previous change, it breaks build and it is not needed
layering violation. As pointed out, there is much better way to do this.
Sorry guys, I need to find a better way to force reviews.

Requested by: harti, julian, scottl (mentor)
Pointy hat to: pjd

Add new failure detection algorithm.
It works as follows:
In every 'interval' seconds defined links are checked.
If they are non-active they will not be used by to data transfer.

No response from: julian, archie
Silent on: net@
Approved by: scottl (mentor)

Back out M_* changes, per decision of the TRB.

Approved by: trb

Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.

o Untangle the confusion with the malloc flags {M_WAITOK, M_NOWAIT} and
the mbuf allocator flags {M_TRYWAIT, M_DONTWAIT}.
o Fix a bpf_compat issue where malloc() was defined to just call
bpf_alloc() and pass the 'canwait' flag(s) along. It's been changed
to call bpf_alloc() but pass the corresponding M_TRYWAIT or M_DONTWAIT
flag (and only one of those two).

Submitted by: Hiten Pandya <hiten@unixdaemons.com> (hiten->commit_count++)

Use intptr_t to fix various sizeof(int) != sizeof(void *) warnings.

Fix GCC warnings caused by initializing a zero length array. In the process,
simply things a bit by getting rid of 'struct ng_parse_struct_info' which
was useless because it only contained one field.

MFC after: 2 weeks

Update to C99, s/__FUNCTION__/__func__/,
also don't use ANSI string concatenation.

Implement direct support for semipersistant nodes.
(e.g. ethernet nodes are persistent until you rip out the hardware)
Use this support in the ethernet and sample nodes.
Add some more abstraction on the 'item's so that node and
hook reference counting can be checked easier.
Slight man page correction.
Make pppoe type dependent on ethernet type.
Clean up node shutdown a little.
Move a mutex from MTX_SPIN to MTX_DEF (oops)
Fix small ref-counting bug.
remove warning on one2many type.

Add a new distribution algorythm to the 'one2many' node type.
The new method is 'flood' (in addition to the old round-robin)
in which incoming packets are sent to more than one outgoing hook.
(I'm not sure what Rogier is using this for but it seems generally useful
and isn't much extra)

Submitted by: Rogier R. Mulhuijzen (drwilco@drwilco.net )

Part 2 of the netgraph rewrite.
This is mostly cosmetic changes, (though I caught a bug or two while
makeing them)
Reviewed by: archie@freebsd.org

Rewrite of netgraph to start getting ready for SMP.
This version is functional and is aproaching solid..
notice I said APROACHING. There are many node types I cannot test
I have tested: echo hole ppp socket vjc iface tee bpf async tty
The rest compile and "Look" right. More changes to follow.
DEBUGGING is enabled in this code to help if people have problems.

Divorce the kernel binary ABI version number from the message
format version number. (userland programs should not need to be
recompiled when the netgraph kernel internal ABI is changed.

Also fix modules that don;t handle the fact that a caller may not supply
a return message pointer. (benign at the moment because the calling code
checks, but that will change)

Reviewed by: Archie@freebsd.org
This clears out my outstanding netgraph changes.
There is a netgraph change of design in the offing and this is to some
extent a superset of soem of the new functionality and some of the old
functionality that may be removed.

This code works as before, but allows some new features that I want to
work with and evaluate. It is the basis for a version of netgraph
with integral locking for SMP use.

This is running on my test machine with no new problems :-)

New netgraph node type ng_one2many(4).