[libfabric-users] Can only use one NIC port in libfabric 1.6.1

[Jörn Schumacher]

Hi Sean,

It's not that libfabric binds to a specific address, but to a specific 
domain in the passive endpoint.

The domain is only ignored when the domain is set to VERBS_ANY_DOMAIN:
https://github.com/ofiwg/libfabric/blob/master/prov/verbs/src/verbs_eq.c#L100

That is set only when no domain name is given:
https://github.com/ofiwg/libfabric/blob/master/prov/verbs/src/verbs_info.c#L1199

If you follow the stacktrace of this call, you will see that this is 
only the case when ofi_is_only_src_port_set yields true. And this is 
only the case when in the parameters to fi_getinfo the node is NULL:
https://github.com/ofiwg/libfabric/blob/master/src/common.c#L598
If anything else is given for node, even "0.0.0.0", the call returns false.

Cheers,
Jörn

On 09/05/2018 06:39 PM, Hefty, Sean wrote:
>> Looks like this was in the past OK:
>>
>> fi_getinfo(FI_VERSION(1, 1), "0.0.0.0", "12345", FI_SOURCE, hints,
>> &fi))
> Hmmm... do you know what address the server ends up with asking for this option?
>
>> While now you need to use:
>>
>> fi_getinfo(FI_VERSION(1, 1), NULL, "12345", FI_SOURCE, hints, &fi))
> - Sean
>
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