MFC @ r241285

IFC @ r242684

Sync from head

Fix build.

This is an import of code, mostly from Giuseppe Lettieri,
that revises the netmap memory allocator so that the
various parameters (number and size of buffers, rings, descriptors)
can be modified at r

This is an import of code, mostly from Giuseppe Lettieri,
that revises the netmap memory allocator so that the
various parameters (number and size of buffers, rings, descriptors)
can be modified at runtime through sysctl variables.
The changes become effective when no netmap clients are active.

The API is mostly unchanged, although the NIOCUNREGIF ioctl now
does not bring the interface back to normal mode: and you
need to close the file descriptor for that.
This change was necessary to track who is using the mapped region,
and since it is a simplification of the API there was no
incentive in trying to preserve NIOCUNREGIF.
We will remove the ioctl from the kernel next time we need
a real API change (and version bump).

Among other things, buffer allocation when opening devices is
now much faster: it used to take O(N^2) time, now it is linear.

Submitted by: Giuseppe Lettieri

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Merge head r233826 through r239173.

Improve lock and unlock symmetry

- Move destruction of per-ring locks to netmap_dtor_locked to mirror the
initialization that happens in NIOCREGIF. Otherwise unloading a netmap-
capable interface t

Improve lock and unlock symmetry

- Move destruction of per-ring locks to netmap_dtor_locked to mirror the
initialization that happens in NIOCREGIF. Otherwise unloading a netmap-
capable interface that was never put into netmap mode would try to
mtx_destroy an uninitialized mutex, and panic.

- Destroy core_lock in netmap_detach, mirroring init in netmap_attach.

- Also comment out the knlist_destroy for now as there is currently no
knlist_init.

Sponsored by: ADARA Networks
Reviewed by: luigi@

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Fix whitespace (missing newline)

Clarify comments about number of tx / rx rings

Merge head r233826 through r239010.

fix some signed/unsigned warnings in the netmap code.
Unfortunately the original drivers still have a lot of
sign conversion/comparison warnings.

Add a newline on an error message;
rename linux functions to avoid confusion;
fix error reporting on linux

- move the inclusion of netmap headers to the common part of the code;
- more portable annotations for unused arguments;

use __builtin_prefetch() for prefetch.

merge in the remaining part of the linux-specific glue so i do not need
to maintain two different distributions.

define prefetch as a noop on !x86

Add support for VALE bridges to the netmap core, see

http://info.iet.unipi.it/~luigi/vale/

VALE lets you dynamically instantiate multiple software bridges
that talk the netmap API (and are *ext

Add support for VALE bridges to the netmap core, see

http://info.iet.unipi.it/~luigi/vale/

VALE lets you dynamically instantiate multiple software bridges
that talk the netmap API (and are *extremely* fast), so you can test
netmap applications without the need for high end hardware.

This is particularly useful as I am completing a netmap-aware
version of ipfw, and VALE provides an excellent testing platform.

Also, I also have netmap backends for qemu mostly ready for commit
to the port, and this too will let you interconnect virtual machines
at high speed without fiddling with bridges, tap or other slow solutions.

The API for applications is unchanged, so you can use the code
in tools/tools/netmap (which i will update soon) on the VALE ports.

This commit also syncs the code with the one in my internal repository,
so you will see some conditional code for other platforms.
The code should run mostly unmodified on stable/9 so people interested
in trying it can just copy sys/dev/netmap/ and sys/net/netmap*.h
from HEAD

VALE is joint work with my colleague Giuseppe Lettieri, and
is partly supported by the EU Projects CHANGE and OPENLAB

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IFC @ r238370

Merge head r233826 through r236168.

MFC

print 'netmap stack ring full' only in verbose mode.

Merge head r233826 through r234834.

IFC @ r234692

sys/amd64/include/cpufunc.h
sys/amd64/include/fpu.h
sys/amd64/amd64/fpu.c
sys/amd64/vmm/vmm.c

- Add API to allow vmm FPU state init/save/restore.

FP stuff discussed with: kib

A bit of cleanup in the names of fields of netmap-related structures.
Use the name 'ring' instead of 'queue' in all fields.
Bump NETMAP_API.

Some code restructuring to bring the memory allocator out of netmap.c
and make it easier to replace it with a different implementation.
On passing, also fix indentation.

NOTE: I know that #include "

Some code restructuring to bring the memory allocator out of netmap.c
and make it easier to replace it with a different implementation.
On passing, also fix indentation.

NOTE: I know that #include "foo.c" is ugly, but the alternative
(add another entry to sys/conf/files, add a separate header with
structs and prototypes, and expose functions that are meant to
be private) looks even worse to me.
We need a more modular way to specify dependencies and build options.

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use correct selinfo pointer for the generic interrupt handler
(it is never used in current FreeBSD drivers).