[Bug 245022] Problem with FreeBSD NLM interoperating with Netapp Filer after software upgrade

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245022

            Bug ID: 245022
           Summary: Problem with FreeBSD NLM interoperating with Netapp
                    Filer after software upgrade
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: rmacklem at FreeBSD.org

Created attachment 212663
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=212663&action=edit
create a tunable to set the NLM client to use TCP

After upgrading the software on a Netapp Filer, serious interoperability
problems were observed between the FreeBSD NLM client and Netapp server.
(The NLM protocol is a separate protocol from NFSv3 that provides file
 locking. Also known as rpc.lockd.)
Reported via email by Daniel Braniss (danny at cs.huji.ac.il).

Although the problem(s) were not completely diagnosed, it appeared to
be related to reuse of the xid in the RPC over UDP header.

Adam McDougall (mcdouga9 at egr.msu.edu) mentioned resolving a similar
issue with the FreeBSD NLM->Netapp Filer by switching the NLM to use TCP
instead of UDP.

I have created this bug report to track this and have two simple patches
that might resolve (or make it easier to deal with) attached here.

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