[openib-general] CMA: port 2 loopback problems

[Michael S. Tsirkin]

Quoting r. Sean Hefty <mshefty at ichips.intel.com>:
> Subject: Re: [openib-general] CMA: port 2 loopback problems
> 
> Michael S. Tsirkin wrote:
> >>Is it possible to communicate between QPs on 
> >>the same device if that device is disconnected from the fabric?
> >
> >
> >Yes.
> 
> What attributes do you use for the pkey index and address vector when 
> connecting the QPs?
> 
> I'm wondering if the correct solution to this issue isn't to create some 
> sort of "loopback" path record.  I'm not sure what changes would be 
> required of the IB CM.

I thought about this too. People actually do expect loopback to work when link
is down.  I guess we could create "loopback" path record, with parameters such
as SL editable from sysfs.

And on port event we could try to update it from the SM.

-- 
MST