Message-ID: <5530C60B.5060308@profitbricks.com>
Date: Fri, 17 Apr 2015 10:36:27 +0200
From: Michael Wang <yun.wang@profitbricks.com>
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To: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
CC: Roland Dreier <roland@kernel.org>, Sean Hefty <sean.hefty@intel.com>,
        Hal Rosenstock <hal.rosenstock@gmail.com>, linux-rdma@vger.kernel.org,
        linux-kernel@vger.kernel.org, Tom Tucker <tom@opengridcomputing.com>,
        Steve Wise <swise@opengridcomputing.com>,
        Hoang-Nam Nguyen <hnguyen@de.ibm.com>,
        Christoph Raisch <raisch@de.ibm.com>,
        Mike Marciniszyn <infinipath@intel.com>, Eli Cohen <eli@mellanox.com>,
        Faisal Latif <faisal.latif@intel.com>,
        Jack Morgenstein <jackm@dev.mellanox.co.il>,
        Or Gerlitz <ogerlitz@mellanox.com>, Haggai Eran <haggaie@mellanox.com>,
        Ira Weiny <ira.weiny@intel.com>, Tom Talpey <tom@talpey.com>,
        Doug Ledford <dledford@redhat.com>, hal@dev.mellanox.co.il
Subject: Re: [PATCH v4 10/27] IB/Verbs: Reform cm related part in IB-core
 cma/ucm
References: <552F6CF2.4000606@profitbricks.com> <552F6DEA.9080701@profitbricks.com> <20150416155823.GB21809@obsidianresearch.com>
In-Reply-To: <20150416155823.GB21809@obsidianresearch.com>
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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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