Import the current version of netmap, aligned with the one on github.

This commit, long overdue, contains contributions in the last 2 years
from Stefano Garzarella, Giuseppe Lettieri, Vincenzo Maffi

Import the current version of netmap, aligned with the one on github.

This commit, long overdue, contains contributions in the last 2 years
from Stefano Garzarella, Giuseppe Lettieri, Vincenzo Maffione, including:
+ fixes on monitor ports
+ the 'ptnet' virtual device driver, and ptnetmap backend, for
high speed virtual passthrough on VMs (bhyve fixes in an upcoming commit)
+ improved emulated netmap mode
+ more robust error handling
+ removal of stale code
+ various fixes to code and documentation (some mixup between RX and TX
parameters, and private and public variables)

We also include an additional tool, nmreplay, which is functionally
equivalent to tcpreplay but operating on netmap ports.

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Merge ^/head r306412 through r306905.

Move netmap selinfo.h in to sensible location.

netmap_kern.h currently requires all drivers including it to include
selinfo.h.

Submitted by: mmacy@nextbsd.org
Reviewed by: gnn
MFC after: 2 weeks
Di

Move netmap selinfo.h in to sensible location.

netmap_kern.h currently requires all drivers including it to include
selinfo.h.

Submitted by: mmacy@nextbsd.org
Reviewed by: gnn
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D5334

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Merge from head

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.

small documentation update

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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Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

Sync to HEAD@r274766

Merge from head@274682

add support for private knote lock (reduces lock contention),
adapting OS_selrecord accordingly.
Problem and fix suggested by adrian and jmg

in the Linux section, properly define the NMG_LOCK type.
Also import WITH_GENERIC in preparation to adding fine-grained
options to disable specific netmap components.

fix a typo

Sync to HEAD@r272516.

IFC @r272185

adapt the code to different freebsd versions.
Not necessary to MFC

IFC @r271694

Sync to HEAD@r271160.

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Provide pointer from struct ifnet to struct netmap_adapter,
instead of abusing spare field.

Sync to HEAD@r270409.