Step 1.5 of importing the network stack virtualization infrastructure
from the vimage project, as per plan established at devsummit 08/08:
http://wiki.freebsd.org/Image/Notes200808DevSummit

Introduc

Step 1.5 of importing the network stack virtualization infrastructure
from the vimage project, as per plan established at devsummit 08/08:
http://wiki.freebsd.org/Image/Notes200808DevSummit

Introduce INIT_VNET_*() initializer macros, VNET_FOREACH() iterator
macros, and CURVNET_SET() context setting macros, all currently
resolving to NOPs.

Prepare for virtualization of selected SYSCTL objects by introducing a
family of SYSCTL_V_*() macros, currently resolving to their global
counterparts, i.e. SYSCTL_V_INT() == SYSCTL_INT().

Move selected #defines from sys/sys/vimage.h to newly introduced header
files specific to virtualized subsystems (sys/net/vnet.h,
sys/netinet/vinet.h etc.).

All the changes are verified to have zero functional impact at this
point in time by doing MD5 comparision between pre- and post-change
object files(*).

(*) netipsec/keysock.c did not validate depending on compile time options.

Implemented by: julian, bz, brooks, zec
Reviewed by: julian, bz, brooks, kris, rwatson, ...
Approved by: julian (mentor)
Obtained from: //depot/projects/vimage-commit2/...
X-MFC after: never
Sponsored by: NLnet Foundation, The FreeBSD Foundation

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Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).

This is the first in a series of commits over the course
of the next few weeks.

Mark all uses of g

Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).

This is the first in a series of commits over the course
of the next few weeks.

Mark all uses of global variables to be virtualized
with a V_ prefix.
Use macros to map them back to their global names for
now, so this is a NOP change only.

We hope to have caught at least 85-90% of what is needed
so we do not invalidate a lot of outstanding patches again.

Obtained from: //depot/projects/vimage-commit2/...
Reviewed by: brooks, des, ed, mav, julian,
jamie, kris, rwatson, zec, ...
(various people I forgot, different versions)
md5 (with a bit of help)
Sponsored by: NLnet Foundation, The FreeBSD Foundation
X-MFC after: never
V_Commit_Message_Reviewed_By: more people than the patch

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Honor the IFF_MONITOR flag.

PR: kern/99500
Submitted by: Craig Leres <leres ee.lbl.gov>
Approved by: re (kensmith)

ng_send_fn() can return with an error, the function of interest
will never be called and OACTIVE will never be reset. Fix this.

Submitted by: Vsevolod Lobko
MFC after: 3 days

SIOCSIFFLAGS doesn't require an argument in kernel land; instead, flags
are supposed to be set directly in ifnet already. This change fixes a
panic when ng_eiface node is attached to ng_fec node and

SIOCSIFFLAGS doesn't require an argument in kernel land; instead, flags
are supposed to be set directly in ifnet already. This change fixes a
panic when ng_eiface node is attached to ng_fec node and the latter is
shut down (ng_fec sets flags and then calls SIOCSIFFLAGS with a NULL
argument).

MFC after: 3 days

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Don't count output bytes twice (the byte accouting is done
in if.c). Count output errors.

MFC after: 3 days

Two fixes:

- Run send queue down to completion, not just one packet.
It has been observed to cause a stall queue otherwise.

- Prevent queueing multiple function calls to a node.

MFC after: 3 days

Simplify setting the link-level address.

Propagate rename of IFF_OACTIVE and IFF_RUNNING to IFF_DRV_OACTIVE and
IFF_DRV_RUNNING, as well as the move from ifnet.if_flags to
ifnet.if_drv_flags. Device drivers are now responsible for
synchron

Propagate rename of IFF_OACTIVE and IFF_RUNNING to IFF_DRV_OACTIVE and
IFF_DRV_RUNNING, as well as the move from ifnet.if_flags to
ifnet.if_drv_flags. Device drivers are now responsible for
synchronizing access to these flags, as they are in if_drv_flags. This
helps prevent races between the network stack and device driver in
maintaining the interface flags field.

Many __FreeBSD__ and __FreeBSD_version checks maintained and continued;
some less so.

Reviewed by: pjd, bz
MFC after: 7 days

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Stop embedding struct ifnet at the top of driver softcs. Instead the
struct ifnet or the layer 2 common structure it was embedded in have
been replaced with a struct ifnet pointer to be filled by a c

Stop embedding struct ifnet at the top of driver softcs. Instead the
struct ifnet or the layer 2 common structure it was embedded in have
been replaced with a struct ifnet pointer to be filled by a call to the
new function, if_alloc(). The layer 2 common structure is also allocated
via if_alloc() based on the interface type. It is hung off the new
struct ifnet member, if_l2com.

This change removes the size of these structures from the kernel ABI and
will allow us to better manage them as interfaces come and go.

Other changes of note:
- Struct arpcom is no longer referenced in normal interface code.
Instead the Ethernet address is accessed via the IFP2ENADDR() macro.
To enforce this ac_enaddr has been renamed to _ac_enaddr.
- The second argument to ether_ifattach is now always the mac address
from driver private storage rather than sometimes being ac_enaddr.

Reviewed by: sobomax, sam

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- Initialize interface as UP when hook is connected.
- Call if_link_state_change() when netgraph flow control
messages are received.

Sponsored by: Rambler

Remove extra ifnet pointer from private data. It can be accessed via arpcom.

Remove ng_connect_t where it is unused. Probably it remained from ng_source.c.

Use subr_unit allocator instead of own functions.

Pull up to ETHER_HDR_LEN before passing an mbuf to ether_input().
The bug was found by running ng_dummy(4) node configured with a
delay, in front of the ng_eiface(4) node.

bzero() -> M_ZERO.

Create a per-module mutex on MOD_LOAD, and destroy it on MOD_UNLOAD.
(This fixes witness_destroy() panic after module unload.)

OK'ed by: rwatson, julian

Fixed an off-by-one error when dealing with interface name
(if_xname is IFNAMSIZ-sized and NUL-terminated).

Added ASCII version of the NGM_EIFACE_GET_IFNAME message, "getifname".

Removed unused includes.

Fix the comment.

Whitespace and "const" changes to reduce diffs to RELENG_4.
(Gives the same object when compiled without NETGRAPH_DEBUG.)

Raise & drop IFF_RUNNING upon receival of netgraph flow control
messages.

Remove orphaned comment about Meta data.

Introduce a new mutex, ng_eiface_mtx, to protect the global unit list
lock used to synchronize allocation of unit numbers for new netgraph
ethernet interfaces.

Reviewed by: glebius