It turns out that too many drivers are not only parsing the L2/3/4
headers for TSO but also for generic checksum offloading.  Ideally we
would only have one common function shared amongst all drivers, and
perhaps when updating them for IPv6 we should introduce that.
Eventually we should provide the meta information along with mbufs to
avoid (re-)parsing entirely.

To not break IPv6 (checksums and offload) and to be able to MFC the
changes without risking to hurt 3rd party drivers, duplicate the v4
framework, as other OSes have done as well.

Introduce interface capability flags for TX/RX checksum offload with
IPv6, to allow independent toggling (where possible).  Add CSUM_*_IPV6
flags for UDP/TCP over IPv6, and reserve further for SCTP, and IPv6
fragmentation.  Define CSUM_DELAY_DATA_IPV6 as we do for legacy IP and
add an alias for CSUM_DATA_VALID_IPV6.

This pretty much brings IPv6 handling in line with IPv4.
TSO is still handled in a different way and not via if_hwassist.

Update ifconfig to allow (un)setting of the new capability flags.
Update loopback to announce the new capabilities and if_hwassist flags.

Individual driver updates will have to follow, as will SCTP.

Reported by:	gallatin, dim, ..
Reviewed by:	gallatin (glanced at?)
MFC after:	3 days
X-MFC with:	r235961,235959,235958
Removed the IFCAP_ prefix when printing the IPv6 checksum capabilities.

Submitted by:	dim
MFC after:	3 days
Correctly export operator new / delete for things linking against libsupc++ but
not libstdc++.

Unfortunately, it appears that libsupc++ / libstdc++ have a different idea of
the type of size_t to the rest of the world, which may cause problems later
on...

Reported by:	des
MFC after:	1 week
if_lagg: allow to invoke SIOCSLAGGPORT multiple times in a row

Currently, 'ifconfig laggX down' does not remove members from this
lagg(4) interface.  So, 'service netif stop laggX' followed by
'service netif start laggX' will choke, because "stop" will leave
interfaces attached to the laggX and ifconfig from the "start" will
refuse to add already-existing interfaces.

The real-world case is when I am bundling together my Ethernet and
WiFi interfaces and using multiple profiles for accessing network in
different places: system being booted up with one profile, but later
this profile being exchanged to another one, followed by 'service
netif restart' will not add WiFi interface back to the lagg: the
"stop" action from 'service netif restart' will shut down my main WiFi
interface, so wlan0 that exists in the lagg0 will be destroyed and
purged from lagg0; the "start" action will try to re-add both
interfaces, but since Ethernet one is already in lagg0, ifconfig will
refuse to add the wlan0 from WiFi interface.

Since adding the interface to the lagg(4) when it is already here
should be an idempotent action: we're really not changing anything,
so this fix doesn't change the semantics of interface addition.

Approved by: thompsa
Reviewed by: emaste
MFC after: 1 week
Fix calculation of the execution buffer end in the mapped pages
when it is spilled into the next page.

MFC after:	1 month
Disable end of buffer fixup by default. New DDX does not need this, and
since batch_len is unused by Linux driver, it seems that it is sometimes
gets passed wrong. This causes command buffer corruption and GPU hung.

Old GEMified DDX drivers that needs this workaround are not supported.

MFC after:	1 month
Make legacy ATA to not call device_add_child() with unit number but
without driver name. This fixed legacy ATA breakage by r235978.

MFC after:	1 week
- Include forgotten bsd.own.mk and fix condition

Reported by:	Jan Beich <jbeich@tormail.org>
Catch a corner case where ssegs could be 0 and thus i would be 0 and
we index suinfo out of bounds (i.e. -1).

Approved by:	gber
Update a comment in get_pv_entry() to reflect the changes to the
synchronization of pv_vafree in r236158.
- Correct the comments regarding the sizes of some partitions in the
  DataFlash.
- Add a mapping for the Nut/OS configuration DataFlash partition according
  to the board manual (but not known to either Linux or U-Boot (patches).
libfetch: Avoid SIGPIPE on network connections.

To avoid unexpected process termination from SIGPIPE when writing to a
closed network connection, enable SO_NOSIGPIPE on all network connections.

The POSIX standard MSG_NOSIGNAL is not used since it requires modifying all
send calls to add this flag. This is particularly nasty for SSL connections.

Reviewed by:	des
Tested by:	bapt
MFC after:	5 days
Upgrade to BIND version 9.8.3, the latest from ISC.

Feature Change

*  BIND now recognizes the TLSA resource record type, created to
   support IETF DANE (DNS-based Authentication of Named Entities)

Bug Fix

*  The locking strategy around the handling of iterative queries
   has been tuned to reduce unnecessary contention in a multi-
   threaded environment.

Other critical bug fixes are included.

All BIND users are encouraged to upgrade.
When writing the jid via the -i flag, do it right when the jail is created,
before any commands run.  /etc/rc.d/jail depends on this.
A small simplification to i915_gem_pager_fault().

Reviewed by:	kib
Update mxge(4) firmware to the latest version available from
Myricom (1.4.55).

MFC after:	3 days
Sponored by: Myricom, Inc.
Make sure that each va_start has one and only one matching va_end,
especially in error cases.
Replace all uses of the vm page queues lock by a r/w lock that is private
to this pmap.c.  This new r/w lock is used primarily to synchronize access
to the TTE lists.  However, it will be used in a somewhat unconventional
way.  As finer-grained TTE list locking is added to each of the pmap
functions that acquire this r/w lock, its acquisition will be changed from
write to read, enabling concurrent execution of the pmap functions with
finer-grained locking.

Reviewed by:	attilio
Tested by:	flo
MFC after:	10 days
Compute the master clock frequency, so we no longer need to have it
compiled into the kernel.  This allows us to boot the same kernel on
machines with different master clock frequencies, so long as we can
determine the main clock frequency accurately.  Cleanup the pmc clock
init function so it can be called in early boot so we can use the
serial port just after we call cninit.

# We have two calls to at91_pmc_clock_init for reasons unknown, that will
# be fixed later -- it is harmless for now.
Fix the problem acpi_sleep_force() hang.

Suspending from callout cause the freeze in DEVICE_SUSPEND().
Suspend from acpi_task thread in stead.

MFC after:	3 days