linux-kernel - Re: [PATCH v3 07/28] IB/Verbs: Reform IB-ulp ipoib

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Message-ID: <20150414182137.GD7682@obsidianresearch.com>
Date:	Tue, 14 Apr 2015 12:21:37 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	"Hefty, Sean" <sean.hefty@...el.com>
Cc:	"Weiny, Ira" <ira.weiny@...el.com>,
	Michael Wang <yun.wang@...fitbricks.com>,
	Roland Dreier <roland@...nel.org>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tom Tucker <tom@...ngridcomputing.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	Hoang-Nam Nguyen <hnguyen@...ibm.com>,
	Christoph Raisch <raisch@...ibm.com>,
	infinipath <infinipath@...el.com>, Eli Cohen <eli@...lanox.com>,
	"Latif, Faisal" <faisal.latif@...el.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>,
	Tom Talpey <tom@...pey.com>, Doug Ledford <dledford@...hat.com>
Subject: Re: [PATCH v3 07/28] IB/Verbs: Reform IB-ulp ipoib

On Tue, Apr 14, 2015 at 06:02:47PM +0000, Hefty, Sean wrote:
> > Yes, that is the only reasonable thing that could happen.
> > 
> > init failure should only be possible under exceptional cases (OOM).
> > 
> > The only system response is to call ib_umad_add_one again - so of
> > course the first call had to completely clean up everything it did.
> 
> A reasonable follow up change would be to replace the add device
> callbacks with add port callbacks.

Yes, combined with a port argument to ib_set_client_data /
ib_get_client_data it would be a nice simplifying clean up.

It would be nice to have sane error handling too :( In an ideal world
the add call back should return an error and the thing that triggered
it should unwind back to module load failure.

Jason
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