From: "Talpey, Thomas" <Thomas.Talpey@netapp.com>
Subject: Re: [pnfs] nfs41: sunrpc: handle clnt==NULL in call_status
Date: Wed, 05 Nov 2008 13:52:42 -0500
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Cc: Tom Tucker <tom@opengridcomputing.com>,
	pNFS Mailing List <pnfs@linux-nfs.org>,
	NFS list <linux-nfs@vger.kernel.org>,
	"Labiaga, Ricardo" <Ricardo.Labiaga@netapp.com>
To: Chuck Lever <chuck.lever@oracle.com>
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At 01:41 PM 11/5/2008, Chuck Lever wrote:
>On Nov 5, 2008, at 1:05 PM, Tom Tucker wrote:
>> FWIW, We already require IPoIB because the NFSRDMA implementation  
>> uses the RDMA CM which is IP address based.
>
>Oh, that's too bad.  I thought the IP sideband requirement would go  
>away with NFSv4 over RDMA because NLM/NSM would be retired.

Just think of it like ARP. The RDMA CM is a low-level discovery and
connection protocol, which isn't actually used by RPC or NFS at all.
It just magically comes into play when the RPC client calls into the
rdma_connect() subsystem. RDMA uses IP addresses, btw.

Tom.