xor to find where free ranges begin and end.

Tested by: pho
Reviewed by:alc
Approved by:markj, kib (mentors)
Differential Revision:	https://reviews.freebsd.org/D20256

* F_RDLCK, F_UNLCK, and F_WRLCK aren't flags.  They're stored in the
  fl.l_type field.
* Add F_REMOTE, added in r177633
* Add F_NOINTR, added in r180025

MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation

MFC after:	1 week

Reported by:	lwhsu@
MFC after:	1 week

MFC after:	1 week

MDT_MODULE info is required to be ordered before any other MDT metadata for
a given kld because it serves as an implicit record boundary between
distinct klds for linker.hints consumers.  kldxref(8) has previously relied
on the assumption that MDT_MODULE was ordered relative to other module
metadata in kld objects by source code ordering.

However, C does not require implementations to emit file scope objects in
any particular order, and it seems that GCC 6.4.0 and/or binutils 2.32 ld
may reorder emitted objects with respect to source code ordering.

So: just take two passes over a given .ko's module metadata, scanning for
the MDT_MODULE on the first pass and the other metadata on subsequent
passes.  It's not super expensive and not exactly a performance-critical
piece of code.  This ensures MDT_MODULE is always ordered before
MDT_PNP_INFO and other MDTs, regardless of compiler/linker movement.  As a
fringe benefit, it removes the requirement that care be taken to always
order MODULE_PNP_INFO after DRIVER_MODULE in source code.

Reviewed by:	emaste, imp
Differential Revision:	https://reviews.freebsd.org/D20405

tables which affect demotion.

The last last-level page table under 2M mappings below KERNend was
only partially initialized.  When that page was used as the hardware
page table for demotion of the 2M mapping, the result was not
consistent.  Since pmap_demote_pde() is switched to use PG_PROMOTED as
the test for the validity of the saved last level page table page, we
can keep page table pages zero-initialized instead.  Demotion would
fill them as needed.

Only map the created page tables beyond KERNend, there is no need to
pre-promote PTmap after KERNend, because the extra mapping is not used.

Only round up *firstaddr to 2M boundary when it is below rounded
KERNend.  Sometimes the allocpages() calls advance *firstaddr past the
end of the last 2MB page mapping. In that case, this conditional
avoids wasting an average of 1MB of physical memory.

Update comments to explain action in more clean and direct language.

Reported and tested by:	pho
In collaboration with:	alc
Sponsored by:	The FreeBSD Foundation (kib)
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D20380

bpf_mtap() can invoke catchpacket() for already detached descriptor.
And this can lead to NULL pointer dereference, since bd_bif pointer
was reset to NULL in bpf_detachd_locked(). To avoid this, use
NET_EPOCH_WAIT() when descriptor is removed from interface's descriptors
list. After the wait it is safe to modify descriptor's content.

Submitted by:	kib
Reported by:	slavash
MFC after:	1 week

is not available.

Submitted by:	Ali Mashtizadeh <ali mashtizadeh.com>
MFC after:	3 days

MFC after:	2 weeks

worklist structures to help track their movement between work lists.
No functional change to the operation of soft updates intended.

Check the CTF magic number in big endian platforms.  This lets DTrace FBT
handle types correctly on these platforms.

Submitted by:	Brandon Bergren
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D20413

'.' function names exist only in ELFv1.  ELFv2 does away with function
descriptors, and look more like they do on powerpc(32) and most other
platforms, as direct function pointers.  Stop blacklisting regular function
names in ELFv2.

Submitted by:	Brandon Bergren
Differential Revision:	https://reviews.freebsd.org/D20346

The device_t always references the softc, so we can pass the device and
obtain the softc instead of the other way around.

This page could probably use further improvement.

This fixes the kernel build with xtoolchain-gcc (6.4.0).

X-MFC-With:	r348268

No functional change (except for out-of-tree C++ kmods).

acpi_config_intr() will be called when an arm64 system booted with ACPI.
We do the interrupt mapping for ACPI interrupts in nexus_acpi_map_intr()
on arm64, so acpi_config_intr() has to just return success without
printing this error message.

Reviewed by:	andrew
Differential Revision:	https://reviews.freebsd.org/D19432

received and support for time stamps was negotiated in the SYN/SYNACK
exchange, perform the PAWS check and only expand the syn cache entry if
the check is passed.
Without this check, endpoints may get stuck on the incomplete queue.

Reviewed by:		jtl@
MFC after:		3 days
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D20374

  [SelectionDAG] soften assertion when legalizing narrow vector FP ops

  The test based on PR42010:
  https://bugs.llvm.org/show_bug.cgi?id=42010

  ...may show an inaccuracy for PPC's target defs, but we should not be
  so aggressive with an assert here. There's no telling what
  out-of-tree targets look like.

This fixes an assertion when building the graphics/mesa-dri port for
PowerPC64.

Reported by:	Mark Millard <marklmi26-fbsd@yahoo.com>
PR:		238082
MFC after:	3 days

Reviewed by:	danfe, hselasky
Approved by:	src (hselasky)
Differential Revision:	https://reviews.freebsd.org/D20353

application's logic.  It's possible that 'else' keyword is missing.

Reviewed by:	gallatin, np, pfg
Approved by:	pfg
Differential Revision:	https://reviews.freebsd.org/D20396

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

It has not been compilable in a long time and doesn't seem very useful.

Suggested by:	kib
MFC after:	1 week

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

optical drives in devfs.conf(5).

MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation

code.  The primary client of this is probably going to be ZFS encryption.

Reviewed by:	jhb, cem
Sponsored by:	iXsystems Inc, Kithrup Enterprises
Differential Revision:	https://reviews.freebsd.org/D19298

This was lost in the re-merger of ISA3 MMU into moea64_native.

Prior to this revision, vtpci's BUS_READ_IVAR method on VIRTIO_IVAR_SUBVENDOR
accidentally returned the PCI subdevice.

The typo seems to have been introduced with the original commit adding
VIRTIO_IVAR_{{SUB,}DEVICE,{SUB,}VENDOR} to virtio_pci.  The commit log and code
strongly suggest that the ivar was intended to return the subvendor rather than
the subdevice; it was likely just a copy/paste mistake.

Go ahead and rectify that.

operations already in its queue were not being properly drained.
The GEOM framework does the queue draining, but the module needs
to wait for the draining to happen. The waiting is done by adding
a g_nop_providergone() function to wait for the I/O operations to
finish up. This change is similar to change -r345758 made to the
memory-disk driver.

Submitted by: Chuck Silvers
Tested by:    Chuck Silvers
MFC after:    1 week
Sponsored by: Netflix

The upper bound for the valid address from the large map used
LARGEMAP_MAX_ADDRESS instead of LARGEMAP_MIN_ADDRESS.  Provide a
function-like macro for proper upper value.

Noted by:	markj
Reviewed by:	alc, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D20386

Similar to PG_FRAME and PG_PS_FRAME, it denotes the mask of the
physical address component of 1G superpage PDP entry.

Reviewed by:	alc, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D20386

The ixl.4 manual page has documented that the threshold falsely detects
interrupt storms on 40Gbit NICs as long ago as 2015, and we have seen
similar false positives with the ioat(4) DMA device (which can push GB/s).

For example, synthetic load can be generated with tools/tools/ioat
'ioatcontrol 0 200 8192 1 1000' (allocate 200x8kB buffers, generate an
interrupt for each one, and do this for 1000 milliseconds).  With
storm-detection disabled, the Broadwell-EP version of this device is capable
of generating ~350k real interrupts per second.

The following historical context comes from jhb@: Originally, the threshold
worked around incorrect routing of PCI INTx interrupts on single-CPU systems
which would end up in a hard hang during boot.  Since the threshold was
added, our PCI interrupt routing was improved, most PCI interrupts use
edge-triggered MSI instead of level-triggered INTx, and typical systems have
multiple CPUs available to service interrupts.

On the off chance that the threshold is useful in the future, it remains
available as a tunable and sysctl.

Reviewed by:	jhb
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D20401

- Perform ifp mismatch checks (to determine if a send tag is allocated
  for a different ifp than the one the packet is being output on), in
  ip_output() and ip6_output().  This avoids sending packets with send
  tags to ifnet drivers that don't support send tags.

  Since we are now checking for ifp mismatches before invoking
  if_output, we can now try to allocate a new tag before invoking
  if_output sending the original packet on the new tag if allocation
  succeeds.

  To avoid code duplication for the fragment and unfragmented cases,
  add ip_output_send() and ip6_output_send() as wrappers around
  if_output and nd6_output_ifp, respectively.  All of the logic for
  setting send tags and dealing with send tag-related errors is done
  in these wrapper functions.

  For pseudo interfaces that wrap other network interfaces (vlan and
  lagg), wrapper send tags are now allocated so that ip*_output see
  the wrapper ifp as the ifp in the send tag.  The if_transmit
  routines rewrite the send tags after performing an ifp mismatch
  check.  If an ifp mismatch is detected, the transmit routines fail
  with EAGAIN.

- To provide clearer life cycle management of send tags, especially
  in the presence of vlan and lagg wrapper tags, add a reference count
  to send tags managed via m_snd_tag_ref() and m_snd_tag_rele().
  Provide a helper function (m_snd_tag_init()) for use by drivers
  supporting send tags.  m_snd_tag_init() takes care of the if_ref
  on the ifp meaning that code alloating send tags via if_snd_tag_alloc
  no longer has to manage that manually.  Similarly, m_snd_tag_rele
  drops the refcount on the ifp after invoking if_snd_tag_free when
  the last reference to a send tag is dropped.

  This also closes use after free races if there are pending packets in
  driver tx rings after the socket is closed (e.g. from tcpdrop).

  In order for m_free to work reliably, add a new CSUM_SND_TAG flag in
  csum_flags to indicate 'snd_tag' is set (rather than 'rcvif').
  Drivers now also check this flag instead of checking snd_tag against
  NULL.  This avoids false positive matches when a forwarded packet
  has a non-NULL rcvif that was treated as a send tag.

- cxgbe was relying on snd_tag_free being called when the inp was
  detached so that it could kick the firmware to flush any pending
  work on the flow.  This is because the driver doesn't require ACK
  messages from the firmware for every request, but instead does a
  kind of manual interrupt coalescing by only setting a flag to
  request a completion on a subset of requests.  If all of the
  in-flight requests don't have the flag when the tag is detached from
  the inp, the flow might never return the credits.  The current
  snd_tag_free command issues a flush command to force the credits to
  return.  However, the credit return is what also frees the mbufs,
  and since those mbufs now hold references on the tag, this meant
  that snd_tag_free would never be called.

  To fix, explicitly drop the mbuf's reference on the snd tag when the
  mbuf is queued in the firmware work queue.  This means that once the
  inp's reference on the tag goes away and all in-flight mbufs have
  been queued to the firmware, tag's refcount will drop to zero and
  snd_tag_free will kick in and send the flush request.  Note that we
  need to avoid doing this in the middle of ethofld_tx(), so the
  driver grabs a temporary reference on the tag around that loop to
  defer the free to the end of the function in case it sends the last
  mbuf to the queue after the inp has dropped its reference on the
  tag.

- mlx5 preallocates send tags and was using the ifp pointer even when
  the send tag wasn't in use.  Explicitly use the ifp from other data
  structures instead.

- Sprinkle some assertions in various places to assert that received
  packets don't have a send tag, and that other places that overwrite
  rcvif (e.g. 802.11 transmit) don't clobber a send tag pointer.

Reviewed by:	gallatin, hselasky, rgrimes, ae
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D20117

This doesn't recognize any features yet, but does parse the features
string.  It advertises an arbitrary packet size of 4k.

Reviewed by:	markj, Scott Phillips <d.scott.phillips@intel.com>
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D20308

vtruncbuf takes a "struct ucred*" argument. AFAICT, it's been unused ever
since that function was first added in r34611. Remove it.  Also, remove some
"struct ucred" arguments from fuse and nfs functions that were only used by
vtruncbuf.

Reviewed by:	cem
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D20377

amd64 also has snd_hda(4) in GENERIC.

Approved by:	jhibbits (src committer), linimon (mentor)

If the file is verified - do not allow write
otherwise do not allow read.

Add O_ACCMODE to stand.h

Reviewed by:	stevek, mindal_semihalf.com
MFC after:	3 days
Sponsored by:	Juniper Networks
Differential Revision:	https://reviews.freebsd.org/D20387

Having this option enabled by default on PowerPC64 kernels makes
booting ISO images much easier when on PowerNV.

With it, the ISO may simply be given to the -i flag of kexec.
Better yet, the ISO may be loop mounted on PetitBoot and its
kernel may be used to load itself.

Without this option, booting ISOs on remote PPC64 machines usually
involve preparing a separate kernel, with this option enabled.