linux-kernel - Re: [PATCH v4 10/27] IB/Verbs: Reform cm related part in IB-core cma/ucm

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Date:	Fri, 17 Apr 2015 10:36:27 +0200
From:	Michael Wang <yun.wang@...fitbricks.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	linux-rdma@...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>,
	Mike Marciniszyn <infinipath@...el.com>,
	Eli Cohen <eli@...lanox.com>,
	Faisal Latif <faisal.latif@...el.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>,
	Ira Weiny <ira.weiny@...el.com>, Tom Talpey <tom@...pey.com>,
	Doug Ledford <dledford@...hat.com>, hal@....mellanox.co.il
Subject: Re: [PATCH v4 10/27] IB/Verbs: Reform cm related part in IB-core
 cma/ucm



On 04/16/2015 05:58 PM, Jason Gunthorpe wrote:
> On Thu, Apr 16, 2015 at 10:08:10AM +0200, Michael Wang wrote:
>>
>> Use raw management helpers to reform cm related part in IB-core cma/ucm.
>>
>> These checks focus on the device cm type rather than the port capability,
>> directly pass port 1 works currently, but can't support mixing cm type
>> device in future.
> 
> After the discussion settled, I ended up thinking that implementing
> explicit device checks, for use by CM, and the BUG_ON at register to
> require all ports have the same value was the best option.
> 
> It also looks like hardwired 1 won't work on switch ports, so it is no-go.

AFAIK, the current HW won't trigger such Bug, actually only mlx4 using port_num
to check the link-layer (but still ib cm anyway), others are just static whatever
the port_num is.

Thus as long as the check is still count on transport type and link-layer, the
BUG may never be triggered...

Regards,
Michael Wang

> 
> Jason
> 
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