[openib-general] round 2 - proposal for socket based connection model

[Tom Tucker]

Arkady:

I may actually have a constructive comment about the protocol (private
data format). One thing I noticed is that *almost* everything in the
private data header is available in the native iWARP protocol header
except the ZB and SI bits.  If these bits become part of the canonical
private data header, then does that require an iWARP transport to use
the header too even though only two bits are useful?

Sorry if this is a dumb question,

Tom

On Tue, 2005-10-25 at 16:40 -0500, Tom Tucker wrote:
> Arkady:
> 
> I don't think anyone disagrees with your goals. Unfortunately additional
> requirements on the implementation were coupled with the specification
> of the private data format (protocol). This peripheral discussion
> derailed any attempt to discuss the protocol. 
> 
> Attempts to separate the protocol discussion from the implementation
> failed. And so here we are...
> 
> 
> On Tue, 2005-10-25 at 15:38 -0400, Kanevsky, Arkady wrote:
> > What are you trying to achieve?
> > 
> > I am trying to define an IB REQ protocol extension that
> > support IP connection 5-tuple exchange between connection
> > requestor and responder.
> > And define mapping between IP 5-tuple and IB entities.
> > 
> > That way ULP which was written to TCP/IP, UDP/IP, CSTP/IP (and so on)
> > can use RDMA transport without change.
> > To modify ULP to know that it runs on top of IB vs. iWARP
> > vs. (any other RDMA transport) is bad idea.
> > It is one thing to choose proper port to connect.
> > Completely different to ask ULP to parse private data
> > in transport specific way.
> > 
> > The same protocol must support both user level ULPs
> > and kernel level ULPs.
> > Arkady
> > 
> > Arkady Kanevsky                       email: arkady at netapp.com
> > Network Appliance                     phone: 781-768-5395
> > 375 Totten Pond Rd.                  Fax: 781-895-1195
> > Waltham, MA 02451-2010          central phone: 781-768-5300
> >  
> > 
> > 
> > > -----Original Message-----
> > > From: Sean Hefty [mailto:mshefty at ichips.intel.com] 
> > > Sent: Tuesday, October 25, 2005 3:22 PM
> > > To: Kanevsky, Arkady
> > > Cc: Sean Hefty; openib-general at openib.org; swg at infinibandta.org
> > > Subject: Re: [openib-general] round 2 - proposal for socket 
> > > based connectionmodel
> > > 
> > > 
> > > Kanevsky, Arkady wrote:
> > > > Sean,
> > > > answers in-line.
> > > > Arkady
> > > 
> > > At this point, I'm just going to disagree with this approach 
> > > and move on with 
> > > the current implementation of the CMA.  What's needed is a 
> > > service that provides 
> > > IB connections using TCP/IP addressing.  I don't believe this 
> > > proposal meets 
> > > this goal.
> > > 
> > > To meet the requirement of connecting over IB using TCP/IP 
> > > addressing, I believe 
> > > that we need a service with a reserved service identifier or range of 
> > > identifiers, a mechanism for mapping between IP and IB 
> > > addresses, and a 
> > > mechanism for reversing the mapping.
> > > 
> > > I don't see where the proposal addresses the bulk of the work 
> > > that's required, 
> > > nor do I think that it will present an API to the user that 
> > > does not expose IB 
> > > related addressing (such as service IDs).
> > > 
> > > - Sean
> > > 
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