Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r247133 and associated fixes (r247151, r247152):

r247133:
Improve mxge's receive performance for IPv6:

- Add support for IPv6 rx csum offload
- Finally switch mxge from using its own driver lro, to
using tcp_lro

r247151:
Fix build.

r247152:
Try harder to make mxge safe for all combinations of INET and INET6

- Re-fix build by restoring local removed in r247151, but protected
by #if defined(INET) || defined(INET6) so that the compile
succeeds in the !(INET||INET6) case.

- Protect call to in_pseudo() with an #ifdef INET, to allow
a kernel to link with mxge when INET is not compiled in.

- Also remove an errant (improperly commented) obsolete debugging printf

MFC r247011:

Add support to mxge for IPv6 TX csum offload & IPv6 TSO.

Sponsored by: Myricom, Inc.

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Implement minimal set of changes suggested by bz to make
mxge no longer depend on INET.

Add optional support to mxge for MSI-X interrupts and multiple receive
queues (which we call slices). The NIC will steer traffic into up to
hw.mxge.max_slices different receive rings based on a configurable
hash type (hw.mxge.rss_hash_type).

Currently the driver defaults to using a single slice, so the default
behavior is unchanged. Also, transmit from non-zero slices is
disabled currently.

- Enable static building of mxge(4) and its firmware.

- Add custom .c wrappers for the firmware, rather than the standard
firmware(9) generated firmware objects to work around toolchain
problems on ia64 involving linking objects produced by
ld -b -binary into the kernel.

- Move from using Myricom's ".dat" firmware blobs to using Myricom's
zlib compressed ".h" firmware header files. This is done to
facilitate the custom wrappers, and saves a fair amount of wired
memory in the case where the firmware is built in, or preloaded.

- Fix two compile issues in mxge which only appear on non-i386/amd64.

Reviewed by: mlaier, mav (earlier version with just zlib support)
Glanced at by: sam
Approved by: re (kensmith)

Hook mxge_lro.c to the build so that the if_mxge.ko module
will load.

- Complete the myri10ge -> mxge name change by doing a mechanical
s/myri10ge/mxge/g replacement in the myri10ge files. A few contuation
lines were joined because of the regained columns.
- Hook the mxge driver back to the build.

10GbE mode driver and binary firmware for Myricom's PCI-express NICs.
More info regarding these nics can be found at http://www.myri.com.

Please note that the files
sys/dev/myri10ge/{mcp_gen_header.h,myri10ge_mcp.h} are internally
shared between all our drivers (solaris, macosx, windows, linux, etc).
I'd like to keep these files unchanged, so I can just import newer
versions of them when the firmware API/ABI changes. This means I'm
stuck with some of the crazy-long #define names, and possibly
non-style(9) characteristics of these files.

Many thanks to mlaier for doing firmware(9) just as I
needed it, and to scottl for his helpful review.

Reviewed by: scottl, glebius
Sponsored by: Myricom Inc.