up to 2 rx/tx queues for the 82574.

Program the 82574 to enable 5 msix vectors, assign 1 to each rx queue,
1 to each tx queue and 1 to the link handler.

Inspired by DragonFlyBSD, enable some RSS logic for handling tx queue
handling/processing.

Move multiqueue handler functions so that they line up better in a diff
review to if_igb.c

Always enqueue tx work to be done in em_mq_start, if unable to acquire
the TX lock, then this will be processed in the background later by the
taskqueue.  Remove mbuf argument from em_start_mq_locked() as the work
is always enqueued.  (stolen from igb)

Setup TARC, TXDCTL and RXDCTL registers for better performance and stability
in multiqueue and singlequeue implementations. Handle Intel errata  3 and
generic multiqueue behavior with the initialization of TARC(0) and TARC(1)

Bind interrupt threads to cpus in order.  (stolen from igb)

Add 2 new DDB functions, one to display the queue(s) and their settings and
one to reset the adapter.  Primarily used for debugging.

In the multiqueue configuration, bump RXD and TXD ring size to max for the
adapter (4096).  Setup an RDTR of 64 and an RADV of 128 in multiqueue configuration
to cut down on the number of interrupts.  RADV was arbitrarily set to 2x RDTR
and can be adjusted as needed.

Cleanup the display in top a bit to make it clearer where the taskqueue threads
are running and what they should be doing.

Ensure that both queues are processed by em_local_timer() by writing them both
to the IMS register to generate soft interrupts.

Ensure that an soft interrupt is generated when em_msix_link() is run so that
any races between assertion of the link/status interrupt and a rx/tx interrupt
are handled.

Document existing tuneables: hw.em.eee_setting, hw.em.msix, hw.em.smart_pwr_down, hw.em.sbp

Document use of hw.em.num_queues and the new kernel option EM_MULTIQUEUE

Thanks to Intel for their continued support of FreeBSD.

Reviewed by:	erj jfv hiren gnn wblock
Obtained from:	Intel Corporation
MFC after:	2 weeks
Relnotes:	Yes
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D1994

really the man page should be renamed as nanobsd.sh is not installed
as nanobsd..

Pointy hat to:	loos
Reported by:	araujo

Previously the OACTIVE flag was being set when the tx descriptors are fully
allocated but it wasn't unset anywhere.

As soon as a packet is transmitted, unset the OACTIVE flag and call start
routine to push any pending packets from the tx queue.

This closes another race where a full tx queue would jam the tx path (tx
queue is full, new packets cannot be added to queue and dwc_txstart never
gets called).

On armv6, cache maintenance can trigger page faults.  Add handling so that
these turn into SIGSEGV that kills the process rather than panics that kill
the kernel.

Differential Revision:	https://reviews.freebsd.org/D2035
Submitted by:	Michal Meloun <meloun@miracle.cz>

gzip(1) cannot be used as bootstrap tools as it depends on syscalls that only
exists on HEAD

This allows to not depend on gunzip(1) at bootstrap time, and is good enough to
wait for upstream real implementation using zlib.

Additionally, sort all real filesystems before the virtual ones.

Differential Revision:	https://reviews.freebsd.org/D2709
Reviewed by:	grehan
MFC after:	5 days

with compressed manpages.

This should fix spam during installworld: "exec: No such file or directory"

Reported by:	many

smh@ at r278034 made it base17, that is somewhat odd. :)

MFC after:	3 days

Remove extra argument from iwi_wme_setparams(), a softc has 1 to 1
accordance with ieee80211com.

This fatal mismatch appeared to be absolutely harmless, since both structs
have pointer to struct ifnet as their first member, and they both point to
the same ifnet.  And the first member is the only one used from the argument.

MFC after:	3 days
X-MFC-to:	stable/10

PM starts at 12:00, not 13:00.

PR:		194291, 200133
Submitted by:	Nick Price
MFC after:	1 week

When providing memory map information to userland, populate the vnode pointer
for tmpfs files.  Set the memory mapping to appear as a vnode type, to match
FreeBSD 9 behavior.

This fixes the use of tmpfs files with the dtrace pid provider,
procstat -v, procfs, linprocfs, pmc (pmcstat), and ptrace (PT_VM_ENTRY).

Submitted by:   Eric Badger <eric@badgerio.us> (initial revision)
Obtained from:  Dell Inc.
PR:             198431
MFC after:      2 weeks
Reviewed by:    jhb
Approved by:    kib (mentor)

applying them to em(4).

Rely on iterations through the local timer, and the tx queue state to
determine if an actual hang has occurred. Any time a descriptor is used
(packet sent), the tx queue is flagged as busy. Then when txeof runs, it
either clears the flag when all is clean, or resets it to 1 if ANY are
cleaned, if nothing is cleaned it increments the flag.

Local timer simply checks to see if busy ever reaches MAX (10, which
is compile time configurable), and then sets it as HUNG, at that point
there is one more timer cycle in which to have any cleans, if not a
watchdog reset will occur.

Differential Revision:	https://reviews.freebsd.org/D2019
Submitted by:	jfv
Reviewed by:	hiren
Obtained from:	Intel Corporation
MFC after:	2 weeks
Relnotes:	Yes
Sponsored by:	Limelight Networks

stage processing is only allowed after the setup complete event has
been received. Else a race may occur and the OUT data can be corrupted.
While at it ensure resetting a FIFO has the required wait loop.

MFC after:	3 days

Sponsored by:	The FreeBSD Foundation

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

Also, validate the chipselect parameter before grabbing ownership of the
hardware, and report timeout errors after releasing it.

PR:		200584

in the correct place.

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

Differential Revision:	D2688
Reviewed by:		rodrigc, mav

Differential Revision:	D2684
Reviewed by:		rodrigc

is not negotiated as minimum, but only reported by sides to each other.

MFC after:	1 week

outer addresses using multiple FIBs.

X-MFC after:	r282809

Disabling soft updates journaling appears to resolve issues
with kernel panics, and may also be generally bad to have
enabled for SD cards.

Requested by:	ian
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

pw(8) to set the correct /etc directory for the user/group
files.

Provided by:	ian (thanks!)
MFC after:	3 days
X-MFC-with:	r283894
Sponsored by:	The FreeBSD Foundation

user in the userland for the target image, but creates the
user in the build chroot.

Before this is re-enabled, I want to figure out a clean way
to do this without requiring the overhead of third-party
utilities (such as qemu).

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

Noticed by:	jhb
Reviewed by:	sef
Sponsored by:	iXsystems, Inc.
MFC after:	2 weeks

Without this, if a process was being traced by truss(1), which
uses different p_stops bits than gdb(1), the latter would
misbehave because of the unexpected bits.

Reported by:	jceel
Submitted by:	sef
Sponsored by:	iXsystems, Inc.
MFC after:	2 weeks

return value. We use this bit to signal when a syscall has failed, and
without this getcontext/setcontext may fail.

MFC after:	1 week

NOTE: This is a technology preview, while it has undergone
      development testing, Intel has not yet completed full
      validation of the feature. It is being integrated for
      early access and customer testing.

NOTE: This is a technology preview, while it has undergone development
      tests, Intel has not yet completed full validation of the feature.
      It is being integrated for early access and customer testing.