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.

two minor changes from the master netmap version:
1. handle errors from nm_config(), if any (none of the FreeBSD drivers
currently returns an error on this function, so this change
is a no-op a

two minor changes from the master netmap version:
1. handle errors from nm_config(), if any (none of the FreeBSD drivers
currently returns an error on this function, so this change
is a no-op at this time
2. use a full memory barrier on ioctls

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whitespace change:
clarify the role of MAKEDEV_ETERNAL_KLD, and remove an old
#ifdef __FreeBSD__ since the code is valid on all platforms.

Merge from HEAD

Merge ^/head r277327 through r277718.

MFhead @ r277659

Change the permissions from 0660 to 0600.

Otherwise people in wheel can do things with netmap, including
but not limited to promisc transmit/receive.

Approved by: luigi
MFC after: 1 week

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

Sync to HEAD@r272516.

IFC @r272185

fix a panic when passing ifioctl from a netmap file descriptor to
the underlying device. This needs to be merged to 10.1

Reported by: Patrick Kelsey
MFC after: 3 days

IFC @r271694

IFC @r269962

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

Sync to HEAD@r270409.

Merge head from 7/28

Update to the current version of netmap.
Mostly bugfixes or features developed in the past 6 months,
so this is a 10.1 candidate.

Basically no user API changes (some bugfixes in sys/net/netmap_user.

Update to the current version of netmap.
Mostly bugfixes or features developed in the past 6 months,
so this is a 10.1 candidate.

Basically no user API changes (some bugfixes in sys/net/netmap_user.h).

In detail:

1. netmap support for virtio-net, including in netmap mode.
Under bhyve and with a netmap backend [2] we reach over 1Mpps
with standard APIs (e.g. libpcap), and 5-8 Mpps in netmap mode.

2. (kernel) add support for multiple memory allocators, so we can
better partition physical and virtual interfaces giving access
to separate users. The most visible effect is one additional
argument to the various kernel functions to compute buffer
addresses. All netmap-supported drivers are affected, but changes
are mechanical and trivial

3. (kernel) simplify the prototype for *txsync() and *rxsync()
driver methods. All netmap drivers affected, changes mostly mechanical.

4. add support for netmap-monitor ports. Think of it as a mirroring
port on a physical switch: a netmap monitor port replicates traffic
present on the main port. Restrictions apply. Drive carefully.

5. if_lem.c: support for various paravirtualization features,
experimental and disabled by default.
Most of these are described in our ANCS'13 paper [1].
Paravirtualized support in netmap mode is new, and beats the
numbers in the paper by a large factor (under qemu-kvm,
we measured gues-host throughput up to 10-12 Mpps).

A lot of refactoring and additional documentation in the files
in sys/dev/netmap, but apart from #2 and #3 above, almost nothing
of this stuff is visible to other kernel parts.

Example programs in tools/tools/netmap have been updated with bugfixes
and to support more of the existing features.

This is meant to go into 10.1 so we plan an MFC before the Aug.22 deadline.

A lot of this code has been contributed by my colleagues at UNIPI,
including Giuseppe Lettieri, Vincenzo Maffione, Stefano Garzarella.

MFC after: 3 days.

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Fixes from Fanco Ficthner on transparent mode

* The way rings are updated changed with the last API bump.
Also sync ->head when moving slots in netmap_sw_to_nic().

* Remove a crashing selrecord()

Fixes from Fanco Ficthner on transparent mode

* The way rings are updated changed with the last API bump.
Also sync ->head when moving slots in netmap_sw_to_nic().

* Remove a crashing selrecord() call.

* Unclog the logic surrounding netmap_rxsync_from_host().

* Add timestamping to RX host ring.

* Remove a couple of obsolete comments.

Submitted by: Franco Fichtner
MFC after: 3 days
Sponsored by: Packetwerk

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