MFC r272263:

Checksum coverage values larger than 65535 for UDPLite are invalid.
Check for this when the user calls setsockopt using UDPLITE_{SEND,RECV}CSCOV.
MFC r272296:
When plen != ulen, it should only be checked when this is UDP.

The commit is from kevlo and he agreed that I MFC it as part of the
UDPLite fixes.
MFC r271505:
Add "readcache" and "writecache" LUN options to control default behavior.

Default values are "on".  Disabling requires backend to support IO_DIRECT
and IO_SYNC flags respectively, or some alternatives.
MFC r271507:
Implement control over command reordering via options and control mode page.

It allows to bypass range checks between UNMAP and READ/WRITE commands,
which may introduce additional delays while waiting for UNMAP parameters.
READ and WRITE commands are always processed in safe order since their
range checks are almost free.
MFC r271606:
Always report that we support REPORT TARGET PORT GROUPS command.

Without clustering support we any way have only one group of permanently
active ports, but that gives us one more supported VMWare feature. ;)

Solaris' Comstar also reports it even when only one port is present.
MFC r271839:
Add support for "no Data-Out Buffer" (NDOB) flag of WRITE SAME (16) command.