[ofa-general] rdma_listen() backlog

[Isaac Huang]

On Thu, Jul 09, 2009 at 11:25:59AM -0700, Sean Hefty wrote:
> >Maybe I've missed something, but the last time I checked it appeared
> >to me that for kernel RDMA CM the 'backlog' parameter was not used at
> >all unless for iWarp transport.
> 
> It's not used for kernel IB connections.  Since connection requests are reported
> through a callback, there's nothing to queue and it's unneeded.

I see, thanks for the explanation. But then why would iWarp transport
cares the 'backlog' while connection requests are also reported via a
callback? iw_cm_listen() allocates resources based on 'backlog' and I
saw this comment over it:

@backlog: The maximum number of outstanding un-accepted inbound listen
  requests to queue.


Thanks,
Isaac