sys/dev: minor spelling fixes.

Most affect comments, very few have user-visible effects.

MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

Mfh r292839

Fix typo (s/harware/hardware/)

Merge from head

Sponsored by: Gandi.net

Merge from head

Finish merging from head, messed up in previous attempt

Merge from head

Merge ^/head r287527 through r287679.

Merge r286744-r287584 from head.

Don't call enable_all_rings if the adapter has been freed.

This is a subtle use-after-free race that results in some very undesirable
hang behaviour.

Reviewed by: pkelsey
Obtained from: Kip Macy, N

Don't call enable_all_rings if the adapter has been freed.

This is a subtle use-after-free race that results in some very undesirable
hang behaviour.

Reviewed by: pkelsey
Obtained from: Kip Macy, NextBSD (https://github.com/NextBSD/NextBSD/commit/91a9bd1dbb33dafb41684d054e59d73976de9654)

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Catch up with head, primarily for the 1.14.4.0 firmware.

Merge ^/head r285341 through r285792.

add a use count so the netmap module cannot be unloaded while in use.

staticize functions only used in netmap.c
(detected by jenkins run with gcc 4.9)

Update documentation on the use of netmap_priv_d,
rename the refcount and use the same structure in
FreeBSD and linux

staticize functions only used in netmap.c
(detected by jenkins run with gcc 4.9)

Update documentation on the use of netmap_priv_d,
rename the refcount and use the same structure in
FreeBSD and linux

No functional changes.

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Sync netmap sources with the version in our private tree.
This commit contains large contributions from Giuseppe Lettieri and
Stefano Garzarella, is partly supported by grants from Verisign and Cisco

Sync netmap sources with the version in our private tree.
This commit contains large contributions from Giuseppe Lettieri and
Stefano Garzarella, is partly supported by grants from Verisign and Cisco,
and brings in the following:

- fix zerocopy monitor ports and introduce copying monitor ports
(the latter are lower performance but give access to all traffic
in parallel with the application)

- exclusive open mode, useful to implement solutions that recover
from crashes of the main netmap client (suggested by Patrick Kelsey)

- revised memory allocator in preparation for the 'passthrough mode'
(ptnetmap) recently presented at bsdcan. ptnetmap is described in
S. Garzarella, G. Lettieri, L. Rizzo;
Virtual device passthrough for high speed VM networking,
ACM/IEEE ANCS 2015, Oakland (CA) May 2015
http://info.iet.unipi.it/~luigi/research.html

- fix rx CRC handing on ixl

- add module dependencies for netmap when building drivers as modules

- minor simplifications to device-specific routines (*txsync, *rxsync)

- general code cleanup (remove unused variables, introduce macros
to access rings and remove duplicate code,

Applications do not need to be recompiled, unless of course
they want to use the new features (monitors and exclusive open).

Those willing to try this code on stable/10 can just update the
sys/dev/netmap/*, sys/net/netmap* with the version in HEAD
and apply the small patches to individual device drivers.

MFC after: 1 month
Sponsored by: (partly) Verisign, Cisco

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Catch up with HEAD (r280229-r284686).

Merge sync of head

Merge from head

MFH: r280643-r281852

Sponsored by: The FreeBSD Foundation

netmap: improve the netmap attach message on FreeBSD.

MFC after: 1 week

Merge from head

Merge r278538 through r279514.

MFH: r278593-r278966

Sponsored by: The FreeBSD Foundation

Merge ^/head r278756 through r278915.