[ewg] Re: [ofa-general] RFC: SRC API

[Michael S. Tsirkin]

> Quoting Gleb Natapov <glebn at voltaire.com>:
> Subject: Re: [ofa-general] RFC: SRC API
> 
> On Mon, Jul 30, 2007 at 12:16:39PM +0300, Michael S. Tsirkin wrote:
> > More code examples:
> > 
> > Create an SRC QP, part of SRC domain:
> > 
> > 	attr.qp_type = IBV_QPT_SRC;
> > 	attr.src_domain = d;
> > 	qp = ibv_create_qp(pd, &attr);
> > 
> > Given remote SRQ number, send data to this SRQ over an SRC QP:
> > 
> > 	wr.src_remote_srq_num = src_remote_srq_num;
> > 	ib_post_send(qp, &wr);
> > 
> > Note: SRQ number needs to be exchanged as part of CM private data
> >       or some other protocol.
> > 
> You are too brief. I can come up with one linears based on the API by
> myself. I am trying to understand how sharing of SRC between processes
> will work and your example doesn't show this.

It seems what you are missing is what SRC is, not how to use the API.
I'll have a working example when I get closer to implementation.
For now you'll have to look up Dror's preso if you want to
understand what SRC is.

> Can I connected the same
> SRC to different QPs? If yes, can I send packet to any SRQ connected to
> the SRC through any QP connected to the same SRC?

Yes to both.

> If yes how is this
> different from having regular QPs?

With regular QP you can only send to a single SRQ.
But again, look at Dror's preso.

-- 
MST