linux-kernel - Re: [PATCH 0/2 RESEND] IB/Verbs: Use helpers to refine the checking on transport and link layer

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Date:	Fri, 27 Mar 2015 17:03:14 +0100
From:	Michael Wang <yun.wang@...fitbricks.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org, Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	"David S. Miller" <davem@...emloft.net>,
	Moni Shoua <monis@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Tatyana Nikolova <Tatyana.E.Nikolova@...el.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	Yan Burman <yanb@...lanox.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	Bart Van Assche <bvanassche@....org>,
	Yann Droneaud <ydroneaud@...eya.com>,
	Colin Ian King <colin.king@...onical.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Matan Barak <matanb@...lanox.com>,
	Majd Dibbiny <majd@...lanox.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Mel Gorman <mgorman@...e.de>,
	Alex Estrin <alex.estrin@...el.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Erez Shitrit <erezsh@...lanox.com>,
	Sagi Grimberg <sagig@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Mike Marciniszyn <mike.marciniszyn@...el.com>,
	Tom Tucker <tom@....us>, Chuck Lever <chuck.lever@...cle.com>
Subject: Re: [PATCH 0/2 RESEND] IB/Verbs: Use helpers to refine the checking
 on transport and link layer


On 03/27/2015 04:55 PM, Jason Gunthorpe wrote:
> On Fri, Mar 27, 2015 at 10:52:10AM +0100, Michael Wang wrote:
>> [snip]
> So, in principle, testing the device should almost make sense. The
> device is the container for things like PD's MR's and QP's and those
> things can migrate between the ports freely, so all post must share
> the same attributes for those items.
>
> However.. AFAIK, we can have RoCEE and IB ports on the same device -
> which makes that whole concept seem sort of like nonsense..
>
> Anyhow, I would discourage testing the device. Each site has to be
> examined and determine if it working with a single port and really
> needs a port attribute (which may be a device attribute today) or if
> it is doing something device wide and is checking if all ports support
> X.
I prefer Doug's proposal that these attributes should be setup
by vendor at very beginning, unless the attributes keep changing...

>
>> Let's discuss and figure out the right name in the thread of
>> v2 patch set, I guess there will be a lot to be correct :-P
> Well, this is actually a hard job. This isn't a mechanical clean up,
> each site has to be inspected and understood before it can be
> migrated to the correct API.
I've send out the RFC patch set, let's see if it is possible to settle
some thing done ;-)

Regards,
Michael Wang

>
> Jason

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