Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

sys/net*: minor spelling fixes.

No functional change.

Add const qualifier to the dst parameter of the ifnet if_output method.

Change if_output to take a struct route as its fourth argument in order
to allow passing a cached struct llentry * down to L2

Reviewed by: rwatson

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

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

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

Add a device type for virtual interfaces.

Remove the ATMIOCENA and ATMIOCDIS ioctl. Everyting has been converted
to use the new OPENVCC and CLOSEVCC calls that allow the sepcification
of traffic parameters for the connections.

Remove the last vestiges of ATM raw mode. This has not been useful for a
long time and has already been removed from the only driver that supported
it (en(4)) and from the man page.

Define a flag for asynchronuous VC open/close operations as used
by the NATM stuff.

Implement a mechanism by which ATM drivers can inform interested
parts of the system about certain kinds of events, like changes
in the ABR rate, changes in the carrier state, PVC changes. The
main consumers of these events are the harp(4) pseudo-driver
and the ILMI daemon via ng_atm(4).

Correct the device identifiers for the ProATM cards.

Implement an utility function that can be used by device drivers to
implement the ATMIOCGVCCS ioctls. This routine handles changing
VCC tables (which can occure because we cannot hold the driver mutex
while allocating memory) with a loop and a re-allocation, should the
table not fit in the allocated memory.

Add identifiers for ProSum's and IDT's cards that are based on
the IDT77252 chip. The driver will follow soon.

ATM_PH_LLCSNAP and ATMIO_FLAG_LLCSNAP must have the same value, so
define one in terms of the other.

Protect a kernel structure by _KERNEL.

Now that most of this file is new, stylify the rest and correct the
style bugs (space/tab) introduced by me.

Add definitions for the ioctls that are used by netgraph and harp to open
and close VCCs.

Fix the breakage introduced by rev. 1.43 of sys/dev/midway.c (don't commit
on friday 13th and without making a universe). This adds struct and
constant definitions for ATM traffic parameters and re-enables the
build of the midway driver.

Tested by: make universe

Define a link layer MIB for ATM. Most fields of this MIB are needed by
ILMI daemons. Factor out common softc fields for all ATM interfaces that
need to be externally visible into an ifatm structure and make the midway
driver using this structure and fill the MIB.

Add module data and version to the atm_subr and reference this info from the
(currently) only consumer (en).

Add a sysctl node hw.atm where the atm drivers will hook on their hardware
sysctl sub-trees.

Make atm_ifattach call if_attach and remove the corresponding call to if_attach
from en. Create atm_ifdetach and use that in en.

While the last change actually changes the interface this is not a problem in
practice because the only other consumer of this API is an older LANAI driver
on the net, that is not ready for current anyway.

Reviewed by: -atm

This corrects a longstanding endian bug in processing LLC/SNAP encoded
frames. A comment in if_atm.h suggests that both macros, that for extracting
the ethertype and that for inserting it, handle their argument in host
byte order. In fact, the inserting macro treated its argument as an opposite
host order short and the calling code feeds it the result of htons(). This
happens to work on i386, but fails on sparc. Make the macro use real host
endianess.

Reviewed by: kjc, atm@

Remove __P.

Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL"
is an application space macro and the applications are supposed to be free
to use it as they please (but cannot). This is consistant with the other
BSD's who made this change quite some time ago. More commits to come.

clean up en atm driver
o fix DDB support
- include "opt_ddb.h"
- fix Debugger() arg
pointed out by bde

o back out pvc shadow interface support
- it is currently not used
- to make it easier to merge another implementation

o misc minor cleanup

update ATM driver. (base version: midway.c 1.67 --> 1.68)

several new features are added:
- support vc/vp shaping
- support pvc shadow interface

code cleanup:
- remove WMAYBE related code. ENI WMAYBE DMA doen't work.
- remove updating if_lastchange for every packet.
- BPF related code is moved to midway.c as it should be.
(bpfwrite should work if atm_pseudohdr and LLC/SNAP are
prepended.)
- BPF link type is changed to DLT_ATM_RFC1483.
BPF now understands only LLC/SNAP!! (because bpf can't
handle variable link header length.)
It is recommended to use LLC/SNAP instead of NULL
encapsulation for various reasons. (BPF, IPv6,
interoperability, etc.)

the code has been used for months in ALTQ and KAME IPv6.

OKed by phk long time ago.

This commit was generated by cvs2svn to compensate for changes in r25603,
which included commits to RCS files with non-trunk default branches.

import Chuck Cranor's ATM driver