Re: GSSD warning with proto=rdma

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On Wed, Oct 28, 2015 at 3:33 PM, Chuck Lever <chuck.lever@xxxxxxxxxx> wrote:
>
>> On Oct 28, 2015, at 3:30 PM, Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx> wrote:
>>
>> On Wed, Oct 28, 2015 at 2:56 PM, Chuck Lever <chuck.lever@xxxxxxxxxx> wrote:
>>> Hi-
>>>
>>> I’m beginning to try Kerberos with NFS/RDMA. I get this complaint
>>> from GSSD:
>>>
>>> Oct 28 13:10:02 manet rpc.gssd[2549]: WARNING: unrecognized
>>> protocol, 'rdma', requested for connection to server
>>> klimt-ib.1015granger.net for user with uid 0
>>>
>>> Should I change the kernel NFS client to tell GSSD it’s using
>>> TCP, or should I change GSSD to recognize RDMA as another form
>>> of TCP?
>>>
>>
>> gssd expects to be able to connect to the IP address that we pass in
>> the upcall. If we can guarantee that IP address can always be resolved
>> in a TCP connection attempt, then let's lie, and call it TCP.
>
> NFS/RDMA still requires IPoIB to provide IP addresses that
> resolve to GUIDs, so I think we can make that guarantee.
>
> Still, do you prefer the kernel to lie, or for GSSD to lie?
> Changing GSSD might be more future-proof.

OK.
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