Refactoring to prepare multi-queues support, no intended behavior change:

- Abstract the allocation/freeing of TX/RX ring into em_dma_malloc().
This will ease the introduction of multiple rings.

- Split the 82576 variant out of 82575. The distinction is necessary
when it comes to setting multiple queues.

- Change multiple TX/RX related macro to take an index argument
corresponding to a ring. Currently only the index 0 and 1 are used.

- Gather and print more stats counters

- Switch to using a function, like FreeBSD, to translate 82542
registers and get rid of a set of defines.

Tested by many, thanks! ok mlarkin@, jmatthew@

Add support for the Intel i219 network chip to the em(4) driver.
from Christian Ehrhardt; input jsg@; OK deraadt@ sthen@ mpi@ jsg@
tested by sthen@ jca@ benno@ bluhm@

Add the remaining parts of support for 82580 based devices such as
the Intel I340-T4 and HP NC365T and simplify some of the multi port
handling while here.

Thanks to fredrik danerklint for donating a card, Linden Varley
for setting up a test system and everyone who made sure this
didn't break their existing em setups.

do not describe where DELAY comes from; pointed out by austin; ok jsg

Sync up to Intel's latest FreeBSD em driver (6.2.9). Adds support
for a few newer Intel PCIe boards, some code removal and cleaning
and a few bug fixes.

From: Jack Vogel@Intel

Tested by mk@ wilfried@ brad@ dlg@, Marc Winiger, Gabriel Kihlman,
Jason Dixon, Johan Mson Lindman, and a few other end users.

Tested with 82543, 82544, 82540, 82545, 82541, 82547, 82546 and 82573.

Sync up to Intel's latest FreeBSD em driver (6.0.5). Adds support
for new chipset revisions embedded in the ESB2 and ICH8 core logic
chipsets.

The previous attempt at commiting this included an unrelated change
to how the I/O base address was being set and this was the cause of
the breakage.

From: Intel's web-site

revert back to the older driver as this causes some breakage.

Sync up to Intel's latest FreeBSD em driver (6.0.5). Adds support
for new chipset revisions embedded in the ESB2 and ICH8 core logic
chipsets.

From: Intel's web-site

Sprinkle some tabs and a little cleaning.

- put spl's right in the code and remove the macros
- remove splassert()'s
- remove empty bus_dma_tag_destroy macro from code and header

sync

Sync with FreeBSD's "em".

Sync with FreeBSD's "em".

ok deraadt@

branches: 1.1.4; 1.1.8;
Driver for Intel PRO/1000 gigabit ethernet adapters.
This driver should work with all current models of gigabit ethernet adapters.

Driver written by Intel
Ported from FreeBSD by Henric Jungheim <henric@attbi.com>
bus_dma and endian support by me.

Add support for the Intel i219 network chip to the em(4) driver.
from Christian Ehrhardt; input jsg@; OK deraadt@ sthen@ mpi@ jsg@
tested by sthen@ jca@ benno@ bluhm@

Add the remaining parts of support for 82580 based devices such as
the Intel I340-T4 and HP NC365T and simplify some of the multi port
handling while here.

Thanks to fredrik danerklint for donating a card, Linden Varley
for setting up a test system and everyone who made sure this
didn't break their existing em setups.

do not describe where DELAY comes from; pointed out by austin; ok jsg

Sync up to Intel's latest FreeBSD em driver (6.2.9). Adds support
for a few newer Intel PCIe boards, some code removal and cleaning
and a few bug fixes.

From: Jack Vogel@Intel

Tested by mk@ wilfried@ brad@ dlg@, Marc Winiger, Gabriel Kihlman,
Jason Dixon, Johan Mson Lindman, and a few other end users.

Tested with 82543, 82544, 82540, 82545, 82541, 82547, 82546 and 82573.

Sync up to Intel's latest FreeBSD em driver (6.0.5). Adds support
for new chipset revisions embedded in the ESB2 and ICH8 core logic
chipsets.

The previous attempt at commiting this included an unrelated change
to how the I/O base address was being set and this was the cause of
the breakage.

From: Intel's web-site

revert back to the older driver as this causes some breakage.

Sync up to Intel's latest FreeBSD em driver (6.0.5). Adds support
for new chipset revisions embedded in the ESB2 and ICH8 core logic
chipsets.

From: Intel's web-site

Sprinkle some tabs and a little cleaning.

- put spl's right in the code and remove the macros
- remove splassert()'s
- remove empty bus_dma_tag_destroy macro from code and header

sync

Sync with FreeBSD's "em".

Sync with FreeBSD's "em".

ok deraadt@

branches: 1.1.4; 1.1.8;
Driver for Intel PRO/1000 gigabit ethernet adapters.
This driver should work with all current models of gigabit ethernet adapters.

Driver written by Intel
Ported from FreeBSD by Henric Jungheim <henric@attbi.com>
bus_dma and endian support by me.