RDMA version of select for multiplexing rdma connections?

RDMA version of select for multiplexing rdma connections?

[Adit Ranadive]

Hello,

I have been building a server client type of application based on top
of RDMA/Verbs user libraries.
The issue that Im running into is how to multiplex between multiple
clients connecting to the server using rdma_listen & rdma_connect
functions.
Looking at he man pages the rdma_listen call supports having a backlog
of connections but doesnt say how to multiplex between that backlog
of connections.

One approach obviously is to create multiple sockets and allow clients
to connect to that but that does not really seem a good solution to
tell clients
which socket to connect to.

Is there a rdma version of the sockets select function which allows us
to multiplex between different sockets for the rdma connection
manager?


Thanks,
Adit
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Re: RDMA version of select for multiplexing rdma connections?

[Jason Gunthorpe]

On Fri, Oct 22, 2010 at 05:07:23PM -0400, Adit Ranadive wrote:

> I have been building a server client type of application based on top
> of RDMA/Verbs user libraries.

You can use select/poll/etc on CQ's after the connection has been
accepted, see ibv_create_comp_channel.

If you want to do non-blocking accept .. I'm not sure that is possible
with RDMA CM. Create a thread to block in rmda_accept and pass
the accepted connection back to your main thread using an eventfd/pipe
construct to wake your select loop?

Jason
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RE: RDMA version of select for multiplexing rdma connections?

[Hefty, Sean]

> If you want to do non-blocking accept .. I'm not sure that is possible
> with RDMA CM. 

non-blocking 'accept' functionality can be achieved by using get_event and select/poll on the associated fd. 
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