[ofa-general] Question about rdma_cm

[Nicolas Morey-Chaisemartin]

Sean Hefty a écrit :
>> For the remote HCA, I can't workout how is the transition done between
>> the destination IP and the lid.
>>
>> Can anyone enlighten me?
>>     
>
> The remote IP address is mapped to what IP considers to be the L2 address
> (typically using ARP).  The 'L2' address contains the destination GID.  The
> rdma_resolve_route() call performs a path record query to the SM using the local
> address (SGID and PKey) and remote address (DGID) to obtain a usable path,
> including the LIDs.
>
> - Sean
>
>   

Hi,

Thanks for your answer.
I saw the DGID to path/LID earlier, but I didn't see where and how
exactly the GID is obtained.
I also saw how the GID is obtained from the L2-like address, but I'm
still not sure how the L2-like address is obtained.
Is there an ARP like protocol implemented on IB?

Anyway thanks for your answers

Best Regards

Nicolas Morey-Chaisemartin