udaddy.c question

[Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>]

Hello rdma wizards,

I'm trying to understand how IB UD service works with the rdmacm in 
linux.  According to the IBTA specification, I should be able to create 
a single UD QP and exchange messages with any number of peers as long as 
I know their qkeys.  Yet when I look at udaddy.c (and even mckey.c), it 
appears that the UD service in the rdmacm is really connection oriented 
and a QP is required for each pair of processes exchanging data.  I 
think this is just the way udaddy.c was implemented, but I want to know 
if it is possible with librdmacm to create a single cm_id with a single 
QP, bind it to an IP address/port, and then send/recv to multiple peers 
(via unicast).  Is this possible?

Thanks!

Steve.


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