modules: increase MAXMODNAME and provide backward compat

With various firmware files used by graphics and wireless drivers
we are exceeding the current 32 character module name (file path
in kldxref) length.
In order to overcome this issue bump it to the maximum path length
for the next version.
To be able to MFC provide backward compat support for another version
of the struct as the offsets for the second half change due to the
array size increase.

MAXMODNAME being defined to MAXPATHLEN needs param.h to be
included first. With only 7 modules (or LinuxKPI module.h) not
doing that adjust them rather than including param.h in module.h [1].

Reported by: Greg V (greg unrelenting.technology)
Sponsored by: The FreeBSD Foundation
Suggested by: imp [1]
MFC after: 10 days
Reviewed by: imp (and others to different level)
Differential Revision: https://reviews.freebsd.org/D32383

Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many)

r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are
still not MPSAFE (or already are but aren’t properly marked).
Use it in preparation for a general review of all nodes.

This is non-functional change that adds annotations to SYSCTL_NODE and
SYSCTL_PROC nodes using one of the soon-to-be-required flags.

Mark all obvious cases as MPSAFE. All entries that haven't been marked
as MPSAFE before are by default marked as NEEDGIANT

Approved by: kib (mentor, blanket)
Commented by: kib, gallatin, melifaro
Differential Revision: https://reviews.freebsd.org/D23718

Notify all sleeping threads of device removal in krping.
Implement d_purge for krping_cdevsw.

Submitted by: slavash@
MFC after: 3 days
Sponsored by: Mellanox Technologies

krping: Fix for memory leak in error case.

Submitted by: hselasky@
Approved by: hselasky (mentor)
MFC after: 1 week
Sponsored by: Mellanox Technologies

Initial RoCE/infiniband kernel update to Linux v4.9.

This patch currently supports:
- ibcore as a kernel module only
- krping as a kernel module only
- ipoib as a kernel module only

Sponsored by: Mellanox Technologies

Send krping output to the log instead of the tty, as is done upstream.

Reviewed by: hselasky@
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D5931

Update krping to the latest upstream code. Move all the FreeBSD
specific parts to krping_dev.c, which leaves the other files as
close to their upstream versions as possible.

Assorted fixes to krping. Disconnect the rest of sys/contrib/rdma from
the build while here. sys/ofed has more recent RDMA code and should be
used instead. We should probably move krping out of sys/contrib/rdma
and get rid of the rest of it.

Obtained from: Chelsio

- Updated TOE support in the kernel.

- Stateful TCP offload drivers for Terminator 3 and 4 (T3 and T4) ASICs.
These are available as t3_tom and t4_tom modules that augment cxgb(4)
and cxgbe(4) respectively. The cxgb/cxgbe drivers continue to work as
usual with or without these extra features.

- iWARP driver for Terminator 3 ASIC (kernel verbs). T4 iWARP in the
works and will follow soon.

Build-tested with make universe.

30s overview
============
What interfaces support TCP offload? Look for TOE4 and/or TOE6 in the
capabilities of an interface:
# ifconfig -m | grep TOE

Enable/disable TCP offload on an interface (just like any other ifnet
capability):
# ifconfig cxgbe0 toe
# ifconfig cxgbe0 -toe

Which connections are offloaded? Look for toe4 and/or toe6 in the
output of netstat and sockstat:
# netstat -np tcp | grep toe
# sockstat -46c | grep toe

Reviewed by: bz, gnn
Sponsored by: Chelsio communications.
MFC after: ~3 months (after 9.1, and after ensuring MFC is feasible)

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

- Import the HEAD csup code which is the basis for the cvsmode work.

Import basic common and iwarp kernel RDMA infrastructure.

Supported by: Chelsio Inc.