[openib-general] dapl broken for iWARP

[Steve Wise]

On Fri, 2007-02-09 at 10:15 -0500, Kanevsky, Arkady wrote:
> Steve,
> what is an issue of using 
> max_qp_rd_atom and max_qp_init_rd_atom
> beside the bad name?

its a hack.

But Bob already asked to do this, so I guess I will.

We still don't ensure interoperability with DAPL consumers.  A global
value would.  Using device max's wont.



> Thanks,
> 
> Arkady Kanevsky                       email: arkady at netapp.com
> Network Appliance Inc.               phone: 781-768-5395
> 1601 Trapelo Rd. - Suite 16.        Fax: 781-895-1195
> Waltham, MA 02451                   central phone: 781-768-5300
>  
> 
> > -----Original Message-----
> > From: Steve Wise [mailto:swise at opengridcomputing.com] 
> > Sent: Thursday, February 08, 2007 6:11 PM
> > To: Arlin Davis
> > Cc: openib-general
> > Subject: Re: [openib-general] dapl broken for iWARP
> > 
> > On Wed, 2007-02-07 at 15:57 -0600, Steve Wise wrote:
> > > On Wed, 2007-02-07 at 14:02 -0600, Steve Wise wrote:
> > > > Arlin,
> > > > 
> > > > The OFED dapl code is assuming the responder_resources and 
> > > > initiator_depth passed up on a connection request event 
> > are from the 
> > > > remote peer.  This doesn't happen for iWARP.  In the 
> > current iWARP 
> > > > specifications, its up to the application to exchange this 
> > > > information somehow. So these are defaulting to 0 on the 
> > server side 
> > > > of any dapl connection over iWARP.
> > > > 
> > > > This is a fairly recent change, I think.  We need to come up with 
> > > > some way to deal with this for OFED 1.2 IMO.
> > > > 
> > > 
> > > The IWCM could set these to the device max values for instance.
> > > 
> > > Steve.
> > > 
> > 
> > There is a slight problem with all this.  There are no device 
> > attributes currently for ORD and IRD.  The ammasso driver 
> > maps these to max_qp_rd_atom (IRD) and 
> > max_qp_init_rd_atom(ORD).  But this is screwy.
> > We need new attribute for these.
> > 
> > For OFED 1.2, I think I should just have the IWCM set them to 
> > 8.  The only RNIC in ofed is cxgb3 and it supports 8...
> > 
> > 
> > Steve.
> > 
> > 
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