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

[Kanevsky, Arkady]

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,

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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