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

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Message-ID: <5530B8F1.4050003@profitbricks.com>
Date:	Fri, 17 Apr 2015 09:40:33 +0200
From:	Michael Wang <yun.wang@...fitbricks.com>
To:	"Weiny, Ira" <ira.weiny@...el.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	"Hefty, Sean" <sean.hefty@...el.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 04/16/2015 07:05 PM, Weiny, Ira wrote:
>>
>> On Wed, Apr 15, 2015 at 09:58:18AM +0200, Michael Wang 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.
> 
> Yes that is what we should do _but_ 
> 
> I think we should tackle that in a different series.
> 
> As you said in another email, this series is getting very long and hard to review/prove is correct.  This is why I was advocating keeping a check at the top of cm_add_one which verified all Ports supported the CM.  This is the current logic today and is proven to work for the devices/use cases out there.
> 
> We can clean up the initialization code and implement support for individual ports in follow on patches.

Agree, as long as this series do not introduce any Bug, I suggest we
put other reform ideas into next series :-)

We have already eliminate the old inferring way and integrate all the
cases into helpers, further reform should be far more clear based on
this foundation.

Regards,
Michael Wang

> 
> Ira
> 
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