[openib-general] Re: Questions about libibat, ib_uat, and ib_a

[Hal Rosenstock]

On Tue, 2005-10-18 at 18:40, Kevin Reilly wrote:
> 
> 
> On Mon, 2005-10-18 at 10:07, Kevin Reilly wrote:
> >On Mon, 2005-10-17 at 10:07, Hal Rosenstock wrote:
> >> > Should this code work, because it seems that out_dev is a kernel
> >> > address (platform: PPC64) which cannot accessed  by a userspace
> >> > program. Via GDB I can see that rt has the following content:
> >> >
> >> > The address is rt->out_dev = 0xc0000000cffaa800 which looks like a
> >> > kernel address.
> >>
> >> Yes, this is a bug which has been previously pointed out on the list and
> >> not fixed.
> >
> >The fix for this involves an ABI change: it should return the GID of the
> >outgoing IB device.
> >
> >-- Hal
> 
> Should we (IBM) work on submitting a patch for this?

That's up to you.

> Returning the GID or the device_name would be good fix.

Yes, either of these could be made to work.

> I guess our reluctance is that we've heard the this address translation
> library function might be depreciated for another interface?

Yes, that has been my reluctance as well. It appears AT is likely to be
superceeded by CMA.

> Having neither leaves us without a method to translate healthy
> "heartbeat-able" IP interfaces to HCAs where we can run things over verbs.

As of now, there is no user space CMA although work is likely to
commence on this shortly. You should make sure the APIs suit your needs.

-- Hal

> Kevin J. Reilly
> STSM, HPC Architecture
> -Federation/HPS  Chief Engineer
> -HPC interconnect architect
> (office) 845-433-7976  (tieline) 8-293-7976
> 
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