MFC r281406:
netmap: improve the netmap attach message on FreeBSD.

sync the code with the version in head. which the exception of
svn 275358 (M_FLOWID deprecation, only a couple of lines)
which cannot be merged.

if_lem_netmap.h, if_re_netmap.h:
- use the same (commented out) function to update the stat counters
as in HEAD. This is a no-op here

netmap.c
- merge 274459 (support for private knote lock)
and minor changes on nm_config and comments

netmap_freebsd.c
- merge 274459 (support for private knote lock)
- merge 274354 (initialize color if passed as argument)

netmap_generic.c
- fix a comment

netmap_kern.h
- revise the lock macros, using sx locks;
merge 274459 (private knote lock)

netmap_monitor.c
- use full memory barriers

netmap_pipe.c
- use full memory barriers, use length from the correct queue
(mostly cosmetic, since the queues typically have the same size)

MFC r272111
fix a panic when passing ifioctl from a netmap file descriptor to
the underlying device. This needs to be merged to 10.1

MFC 270063: update of netmap code
(vtnet and cxgbe not merged yet because we need some other mfc first)

MFC 267284
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

sync netmap code with the version in HEAD:
- fix handling of tx mbufs in emulated netmap mode;
- introduce mbq_lock() and mbq_unlock()
- rate limit some error messages
- many whitespace and comment fixes

MFH: sync the netmap code with the one in HEAD
(enhanced VALE switch, netmap pipes, emulated netmap mode).
See details in the log for svn 261909.

MFC r281406:
netmap: improve the netmap attach message on FreeBSD.

sync the code with the version in head. which the exception of
svn 275358 (M_FLOWID deprecation, only a couple of lines)
which cannot be merged.

if_lem_netmap.h, if_re_netmap.h:
- use the same (commented out) function to update the stat counters
as in HEAD. This is a no-op here

netmap.c
- merge 274459 (support for private knote lock)
and minor changes on nm_config and comments

netmap_freebsd.c
- merge 274459 (support for private knote lock)
- merge 274354 (initialize color if passed as argument)

netmap_generic.c
- fix a comment

netmap_kern.h
- revise the lock macros, using sx locks;
merge 274459 (private knote lock)

netmap_monitor.c
- use full memory barriers

netmap_pipe.c
- use full memory barriers, use length from the correct queue
(mostly cosmetic, since the queues typically have the same size)

MFC r272111
fix a panic when passing ifioctl from a netmap file descriptor to
the underlying device. This needs to be merged to 10.1

MFC 270063: update of netmap code
(vtnet and cxgbe not merged yet because we need some other mfc first)

MFC 267284
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

sync netmap code with the version in HEAD:
- fix handling of tx mbufs in emulated netmap mode;
- introduce mbq_lock() and mbq_unlock()
- rate limit some error messages
- many whitespace and comment fixes

MFH: sync the netmap code with the one in HEAD
(enhanced VALE switch, netmap pipes, emulated netmap mode).
See details in the log for svn 261909.