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

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Message-ID: <CAG4TOxPMaRAR_B69J1_SHaHh8YMW2Unx786t2FbrA8g=05BAgA@mail.gmail.com>
Date:	Thu, 16 Apr 2015 10:02:46 -0700
From:	Roland Dreier <roland@...nel.org>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	Michael Wang <yun.wang@...fitbricks.com>,
	"Hefty, Sean" <sean.hefty@...el.com>,
	"Weiny, Ira" <ira.weiny@...el.com>,
	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 Thu, Apr 16, 2015 at 9:44 AM, Jason Gunthorpe
<jgunthorpe@...idianresearch.com> wrote:
>> We can give client->add() callback a return value and make
>> ib_register_device() return -ENOMEM when it failed, just wondering
>> why we don't do this at first, any special reason?

> No idea, but having ib_register_device fail and unwind if a client
> fails to attach makes sense to me.

It seems a bit unfriendly to fail an entire device if one ULP has a
problem.  Let's say you have a system whose main network connection is
IPoIB.  Would you want that connection to come up even if, say, the
NFS/RDMA server fails to find the memory registration type it likes?

 - R.
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