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

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Date:	Thu, 21 May 2015 09:51:23 +0300
From:	Haggai Eran <haggaie@...lanox.com>
To:	"Hefty, Sean" <sean.hefty@...el.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	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

On 20/05/2015 03:49, Hefty, Sean wrote:
>>> 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.
Patch 8 in this series (IB/cma: Add compare_data checks to the RDMA CM
module) basically does that (change rdma_cm so that it doesn't rely on
private_data checks in ib_cm). Indeed, it is positioned in the series
before adding the rdma_cm namespace support.

It remains to clean up ib_cm's ib_cm_listen interface now that
compare_data isn't used, but I'm not sure this belongs in this series.

Haggai
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