[Bug 209700] [iscsi] ctld advertises support for tagged queuing but does not appear to support it

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209700

            Bug ID: 209700
           Summary: [iscsi] ctld advertises support for tagged queuing but
                    does not appear to support it
           Product: Base System
           Version: 10.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: agrier at poofygoof.com

Using NetBSD-7 iscsi initiator to FreeBSD-10.2-RELEASE ctld target fails with
check condition, overlapped commands attempted, even though ctld claims that it
supports tagged queueing.

packet captures available at
http://poofygoof.com/~agrier/attic/freebsd_iscsi.cap.bz2 .

for comparison, the same client connecting to a smartOS (illumOS/opensolaris)
iSCSI target is at http://poofygoof.com/~agrier/attic/smartos_iscsi.cap.bz2 ,
which works correctly.

current workaround is to add a quirk to the NetBSD initiator for the FreeBSD
target to disable tagged queuing support.  it is expected that this hurts
throughput, since by definition it disables opportunities for pipelining.

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