netdev - RE: [PATCH v3 for-next 05/13] IB/cm: Reference count ib_cm

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Date:	Wed, 20 May 2015 00:49:44 +0000
From:	"Hefty, Sean" <sean.hefty@...el.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	Haggai Eran <haggaie@...lanox.com>,
	Doug Ledford <dledford@...hat.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Liran Liss <liranl@...lanox.com>,
	Guy Shapiro <guysh@...lanox.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Yotam Kenneth <yotamke@...lanox.com>
Subject: RE: [PATCH v3 for-next 05/13] IB/cm: Reference count ib_cm_ids

> > I wonder if the existing ib_cm interface is even what we want.
> > Currently, the rdma_cm pushes the private data (i.e. IP address)
> > comparison into the ib_cm.  This is only used by the rdma_cm.
> > Should that instead be moved out of the ib_cm and handled in the
> > rdma_cm?  And then update the ib_cm to support multiple listens on
> > the same service id.
> 
> Well, that really is the problem here, the private data compare
> doesn't really do enough because rdma cm wildcard's the IP address and
> does it's own check anyhow. So I see all of this as different
> proposals on how to fix that. rdma_cm basically already does most of
> the private data compare itself.

Maybe the first thing to fix is this.  Since the private data compare is no longer sufficient, remove it and update the rdma_cm to handle the change.  Regardless of how the code ends up structured, the namespace support should then easily fit into that solution.

- Sean
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