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

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

Backport just the sys/{dev,modules}/cxgb{,e}/ parts of r237263, and then
disable the TOE and iWARP modules in the Makefiles (they won't compile
without the rest of r237263).

This reduces diffs between the cxgb/cxgbe drivers in head and 9 and
makes it easy to MFC other fixes to 9.

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

Approved by: re (implicit)

fix incorrect use of atomic_set_xxx in cxgb

There is no need to use an atomic operation at structure initialization
time.
Note that the file changed is not connected to the build at this time.

Reviewed by: jhb (general issue)
Approved by: np
MFC after: 2 weeks

Update firmware version check
make ddp a tunable

Obtained from: Chelsio Inc.
MFC after: 3 days

- Remove default NIC dependency on ulp headers
- make toe module build dependent on kernel support

Submitted by: Chelsio Inc.
MFC after: 1 week

Update cxgb include paths to not require prefixing with dev/cxgb

Submitted by: Chelsio Inc.

Fix issue with tom loading by moving cxgb_log_tcb in to tom

MFC after: 3 days

Remove some dead code along with gratuitous differences between HEAD and 7

Unbreak the build by including sys/socketvar.h

fix includes for post sockbuf re-factor

move cxgb_lt2.[ch] from NIC to TOE
move most offload functionality from NIC to TOE
factor out all socket and inpcb direct access
factor out access to locking in incpb, pcbinfo, and sockbuf

remove call to kdb_backtrace()

- update firmware to 5.0
- add support for T3C
- add DDP support (zero-copy receive)
- fix TOE transmit of large requests
- fix shutdown so that sockets don't remain in CLOSING state indefinitely
- register listeners when an interface is brought up after tom is loaded
- fix setting of multicast filter
- enable link at device attach
- exit tick handler if shutdown is in progress
- add helper for logging TCB
- add sysctls for dumping transmit queues

- note that TOE wxill not be MFC'd until after 7.0 has been finalized

MFC after: 3 days

Make TCP offload work on HEAD (modulo negative interaction between sbcompress
and t3_push_frames).
- Import latest changes to cxgb_main.c and cxgb_sge.c from toestack p4 branch
- make driver local copy of tcp_subr.c and tcp_usrreq.c and override tcp_usrreqs so
TOE can also functions on versions with unmodified TCP

- add cxgb back to the build

Add driver for TCP offload

Sponsored by: Chelsio Inc.