[ofa-general] librdmacm port selection for rdma_bind_addr()

[Tang, Changqing]

Thanks, For all the sample code, the call rdma_resolve_addr() specify
a port number, which is the same as port number when calling
rdma_bind_addr()
on the other side, 

I hope port number is not necessary for rdma_resolve_addr() call.

--CQ

> -----Original Message-----
> From: Steve Wise [mailto:swise at opengridcomputing.com] 
> Sent: Wednesday, October 17, 2007 9:38 AM
> To: Tang, Changqing
> Cc: Sean Hefty; general at lists.openfabrics.org
> Subject: Re: [ofa-general] librdmacm port selection for 
> rdma_bind_addr()
> 
> 
> 
> Tang, Changqing wrote:
> > Below is the piece of rping.c code, how do I pick the 
> returned port ? 
> > Do you reset sin.sin_port inside rdma_bind_addr() if I pass 0 to 
> > sin.sin_port ?
> > 
> 
> Yes.
> 
> > I need the returned port to tell client side to call 
> > rdma_resolve_addr(). If I am right, rdma_resolve_addr() needs dest 
> > port number.
> >
> 
> Sean, Does resolve_addr really need anything more than the ip 
> address? 
> For iWARP it doesn't.
> 
> 
> > 
> > static int rping_bind_server(struct rping_cb *cb) {
> > 	struct sockaddr_in sin;
> > 	int ret;
> > 
> > 	memset(&sin, 0, sizeof(sin));
> > 	sin.sin_family = AF_INET;
> > 	sin.sin_addr.s_addr = cb->addr;
> > 	sin.sin_port = 0;	///////////cb->port;
> > 
> > 	ret = rdma_bind_addr(cb->cm_id, (struct sockaddr *) &sin);
> > 	if (ret) {
> > 		fprintf(stderr, "rdma_bind_addr error %d\n", ret);
> > 		return ret;
> > 	}
> > 	DEBUG_LOG("rdma_bind_addr successful\n");
> > 
> > --CQ
> > 
> >> -----Original Message-----
> >> From: Sean Hefty [mailto:mshefty at ichips.intel.com]
> >> Sent: Tuesday, October 16, 2007 11:40 AM
> >> To: Tang, Changqing
> >> Cc: general at lists.openfabrics.org
> >> Subject: Re: [ofa-general] librdmacm port selection for
> >> rdma_bind_addr()
> >>
> >>> 	Is there a way to let system choose a port for me ? 
> >> like TCP/IP, if
> >>> port is set to 0, system will return an unused port.
> >> Yes - binding to port 0 will return a usable port.
> >>
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