[ofa-general] uDAPL Question

[Don Kerr]

I am working on a uDAPL layer for Open MPI.  The situation is if I have 
more than one port/HCA my users may want to be selective in what is used 
and to do this they would need to provide some information regarding 
which port/HCA to use. So my thought is that the users are more familar 
with the output from "ifconfig", for example ib0, ib1, etc, and I was 
trying to find a way to correlate that to what is available from the 
uDAPL API. Maybe I need to reprogram them to look at dat.conf.

-DON

Arlin Davis wrote:

> Don Kerr wrote:
>
>> OK, so no good way to determine this from uDAPL alone, its expected 
>> that the provider will register/deregister with the file as needed.
>>
>> Next question. is there a way to get the entire dat.conf entry from 
>> the uDAPL API?
>>
>> Example: Typical dat.conf entry might look something like:
>>    OpenIB-cma u1.2 nonthreadsafe default 
>> /usr/local/lib64/libdaplcma.so dapl.1.2 "ib0 0" ""
>>
>> I can find the first field, in this example "OpenIB-cma", from the ia 
>> attribute name but what if I wanted to correlate say the 6th field, 
>> "ib0 0", with the first field?
>>
> What are you trying to determine from this parsing? Do you need to 
> actually know the netdev name or can you get by with the address of 
> the device? If you are using dat_registry_list_providers(), just walk 
> the list, use the device name for the dat_ia_open and if it returns 
> DAT_SUCCESS the device is active and configured. You can then call 
> dat_ia_query to get the IP address.
>
> -arlin