kernel/netmap: Move headers into <net/netmap/...>.

Note that netmap isn't hooked into the build right now, and because of
that, this commit results in removing them from their current location.

Som

kernel/netmap: Move headers into <net/netmap/...>.

Note that netmap isn't hooked into the build right now, and because of
that, this commit results in removing them from their current location.

Some dports like net/libpcap started breaking after 2c68437386f4be2ed45a4
because configure found a building netmap_user.h and decided that we have
a current and usable netmap.

Reported-by: zrj

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kernel - Remove PG_ZERO and zeroidle (page-zeroing) entirely

* Remove the PG_ZERO flag and remove all page-zeroing optimizations,
entirely. Aftering doing a substantial amount of testing, these

kernel - Remove PG_ZERO and zeroidle (page-zeroing) entirely

* Remove the PG_ZERO flag and remove all page-zeroing optimizations,
entirely. Aftering doing a substantial amount of testing, these
optimizations, which existed all the way back to CSRG BSD, no longer
provide any benefit on a modern system.

- Pre-zeroing a page only takes 80ns on a modern cpu. vm_fault overhead
in general is ~at least 1 microscond.

- Pre-zeroing a page leads to a cold-cache case on-use, forcing the fault
source (e.g. a userland program) to actually get the data from main
memory in its likely immediate use of the faulted page, reducing
performance.

- Zeroing the page at fault-time is actually more optimal because it does
not require any reading of dynamic ram and leaves the cache hot.

- Multiple synth and build tests show that active idle-time zeroing of
pages actually reduces performance somewhat and incidental allocations
of already-zerod pages (from page-table tear-downs) do not affect
performance in any meaningful way.

* Remove bcopyi() and obbcopy() -> collapse into bcopy(). These other
versions existed because bcopy() used to be specially-optimized and
could not be used in all situations. That is no longer true.

* Remove bcopy function pointer argument to m_devget(). It is no longer
used. This function existed to help support ancient drivers which might
have needed a special memory copy to read and write mapped data. It has
long been supplanted by BUSDMA.

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ifnet: Make ifnet and ifindex2ifnet MPSAFE

- Accessing to these two global variables from non-netisr threads uses
ifnet lock. This kind of accessing is from
- Accessing to ifindex2ifnet from neti

ifnet: Make ifnet and ifindex2ifnet MPSAFE

- Accessing to these two global variables from non-netisr threads uses
ifnet lock. This kind of accessing is from
- Accessing to ifindex2ifnet from netisrs are lockless MPSAFE.
- Netisrs no longer access ifnet, instead they access ifnet array as of
this commit, which is lockless MPSAFE.

Rules for accessing ifnet and ifindex2ifnet is commented near the
declaration of the related global variables/functions in net/if_var.h.

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netmap: Remove unnecessary ifunit call

kernel/netmap: Switch sysctls over to dev.netmap like in FreeBSD.

netmap: reconstruct vm_page_getfake/vm_page_updatefake

Taken from: FreeBSD

netmap: bring back cdevpriv usage

This partially reverts commit 3efed4582e1 now that we have these
functions. There are three remaining porting issues:

* vm fake pages support
* poll to kqfilter
*

netmap: bring back cdevpriv usage

This partially reverts commit 3efed4582e1 now that we have these
functions. There are three remaining porting issues:

* vm fake pages support
* poll to kqfilter
* if_transmit

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netmap: reduce upstream diff output; bring back __FBSDIDs

netmap: properly store private device data

Yes, one could go through the trouble of redefining the cdevpriv
functions as macros returning wild errors, but it looks a lot
cleaner in native code.

netmap: change header includes

Suggested-by: sephe

FWIW, kqfilter() port is not really going well as poll() is doing
a bunch of loosely related drive-by actions that somehow form the
API. The best

netmap: change header includes

Suggested-by: sephe

FWIW, kqfilter() port is not really going well as poll() is doing
a bunch of loosely related drive-by actions that somehow form the
API. The best approach would be to thin out the implementation to
at least get the bare core functionality working. That'll also
include writing new userland glue. Feels more like a fork than a
port that way. :(

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netmap: d_poll -> d_kqfilter

netmap_poll() is a monster. No clue how to move it over
to the kqfilter API just yet.

netmap: fix all the cdev prototypes

While there, reduce diff noise against vanilla sources.

netmap: more porting; undo some mistakes

Probably adds new issues, too. There's some VM magic,
cdev_t adaption and a couple of network internals left.

netmap: lock(9), k*() foo, no ifdefs

The ifdef glue is a bit hard to see through. Remove it now to
bring it back later with appropriate ifdefs for DragonFly.

netmap: initial import of netmap core

Vanilla sources; not hooked up to the build.

Taken-from: https://code.google.com/p/netmap/ (3b385fe7854d)