[openib-general] mapping between IP address and device name

[Hal Rosenstock]

Hi again Kevin,

I'd like to go back to your original query to make sure I understand
things.

On Mon, 2005-06-20 at 22:23, Kevin Reilly wrote:
> Maybe somebody could help me understand the proper way to map between an IP
> address assigned to a port to the
> "device  name" and "port number" in the gen2 architecture.  If I have an IP
> address can I map it to a name that i get back
> from ibv_get_device_name() or pass to ibv_open_device().

So the application knows the IP addresses of the local IP interfaces and
(potentially) the device names and ports but not their correspondence.
It is the correspondence that is needed, Is that correct ? Are the local
IP interfaces limited to IPoIB or are there alternate IP network
interfaces as well ?

Thanks.

-- Hal

>      Here  is  the  problem.  Let's  say  there  is  a  subsystem that used
> heartbeating over IP interfaces to ascertain the adapters
> and  ports  state,  up  or  down.   The  data  actively  maintained be this
> heartbeating subsystem is used by a job scheduler that
> desires  to  only schedule tasks on HCAs that are UP and have active ports.
> The job scheduler does not want to launch jobs
> on adapters that are broken, not connected to a switch or not configured.

>       The  job  scheduler  needs a way to map an IP address into a name and
> port number sitable to be passed to the job to
> use   when   ibv_open_device()   is  called  or  to  match  the  output  of
> ibv_get_device_name().

> 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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