[openib-general] [PATCH] IPOIB: Use a GRH when appropriate forunicast packets

[Hal Rosenstock]

Arkady,

On Fri, 2007-02-09 at 10:32, Kanevsky, Arkady wrote:
> Hal,
> unfortunately, IBTA punted on this issue.
> We considered it for IBTA CM IP address annex but at the end
> could not handle all the cases.

Thanks.

Any idea if this issue might be addressed (no pun intended) or whether
it is left for implementors to decide if/how to try to handle this ?

-- Hal

> 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: Hal Rosenstock [mailto:halr at voltaire.com] 
> > Sent: Wednesday, February 07, 2007 7:20 PM
> > To: Sean Hefty
> > Cc: Jason Gunthorpe; Roland Dreier; 
> > openib-general at openib.org; Kanevsky, Arkady
> > Subject: Re: [openib-general] [PATCH] IPOIB: Use a GRH when 
> > appropriate forunicast packets
> > 
> > On Wed, 2007-02-07 at 15:24, Sean Hefty wrote:
> > > > I didn't get too far on getting CMA to work. Beyond the 
> > bad HopLimit 
> > > > feild I was seeing Hal pointed out a number of problems 
> > in IBA that 
> > > > would prevent it from working as is :<
> > > 
> > > I've started thinking about what it would take to get the 
> > rdma cm to 
> > > work across a router.  I think the rdma cm may need to treat IPv6 
> > > addresses as a GID for this to work across subnets, versus 
> > trying to 
> > > map an ipoib IP address to a GID based on ARP.
> > 
> > An IB GID is IPv6 like but not an IPv6 address so I don't 
> > think this is a good idea and don't see how you get around 
> > mapping IP addresses to GIDs in an IB routed network given 
> > the way things are spec'd. I think that the RDMA CM assumes a 
> > single IPoIB subnet. Does it work when the destination is on 
> > another subnet ? I think there are some unaddressed gateway 
> > issues here to make that work and these may have been punted 
> > (during spec time). Arkady might be a good person to comment on this.
> > 
> > -- Hal
> > 
> > > - Sean
> > > 
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