[openib-general] Re: RFC: cma: need rdma_unbind

[Michael S. Tsirkin]

Quoting r. Sean Hefty <mshefty at ichips.intel.com>:
> Subject: Re: RFC: cma: need rdma_unbind
> 
> Michael S. Tsirkin wrote:
> >No. A socket is a 5 tuple (proto, local addr, local port, remote addr, 
> >remote
> >port).  unbind just says that you can reuse local addresses, so e.g. a new
> >connection request will connect to a new socket.
> 
> I understand.  But if both sides do this, then the local and remote ports 
> become available for re-use, and a new connection between the systems could 
> end up with the same tuple.

I think you are right. That's a known property of REUSEADDR I think.

> >Maybe rename it unbind_local?
> 
> I'm fine with the name rdma_unbind().  I will likely change 
> rdma_bind_addr() to just rdma_bind() at some point.  I'm just trying to 
> determine what the real limitations are to rdma_unbind(), or if there's 
> some other solution that we're missing that may make more sense, such as 
> having SDP control its own port space.

That's always possible I guess. But do let me know.

-- 
MST