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

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Date:	Tue, 14 Apr 2015 16:32:57 +0200
From:	Michael Wang <yun.wang@...fitbricks.com>
To:	"ira.weiny" <ira.weiny@...el.com>,
	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>,
	Tom Talpey <tom@...pey.com>, Doug Ledford <dledford@...hat.com>
Subject: Re: [PATCH v3 07/28] IB/Verbs: Reform IB-ulp ipoib



On 04/14/2015 04:18 PM, ira.weiny wrote:
[snip]
>  
>  /**
> - * cap_ib_cm_dev - Check if any port of device has the capability Infiniband
> - * Communication Manager.
> + * cap_ib_cm_any_port - Check if any port of the device has Infiniband
> + * Communication Manager (CM) support.
>   *
>   * @device: Device to be checked
>   *
> - * Return 0 when all port of the device don't support Infiniband
> - * Communication Manager.
> + * Return 1 if any port of the device supports the IB CM.
>   */
> -static inline int cap_ib_cm_dev(struct ib_device *device)
> +static inline int cap_ib_cm_any_port(struct ib_device *device)
>  {
>         int i;

I think we maybe able to get rid of this helper according to Sean's suggestion :-)

We just need to check the port 1 of HCA see if it support ib cm, seems like
currently there is no case that port 1 support cm while others doesn't.

Regards,
Michael Wang

>  
> 
>>
>> That seems reasonable, and solves the #10 problem, but we should
>> enforce this invariant during device register.
>>
>> Typically the ports seem to be completely orthogonal (like SA), so in those
>> cases the _dev and restriction makes no sense.
> 
> While the ports in ib_sa and ib_umad probably can be orthogonal the current
> implementation does not support that and this patch series obscures that a bit.
> 
>>
>> CM seems to be different, so it should probably enforce its rules
> 
> Technically, the implementation of the ib_sa and ib_umad modules are not
> different it is just that Michaels patch is not broken.
> 
> I'm not saying we can't change the ib_sa and ib_umad modules but the current
> logic is all or nothing.  And I think changing this :
> 
> 	1) require more review and testing
> 	2) is not the purpose of this series.
> 
> Ira
> 
>>
>> Jason
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