linux-kernel - Re: [PATCH v2 01/17] IB/Verbs: Implement new callback query

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Date:	Thu, 09 Apr 2015 17:19:08 -0400
From:	Doug Ledford <dledford@...hat.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	Michael Wang <yun.wang@...fitbricks.com>,
	Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org, Hal Rosenstock <hal.rosenstock@...il.com>,
	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>,
	Upinder Malhi <umalhi@...co.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	"David S. Miller" <davem@...emloft.net>,
	Ira Weiny <ira.weiny@...el.com>,
	PJ Waskiewicz <pj.waskiewicz@...idfire.com>,
	Tatyana Nikolova <Tatyana.E.Nikolova@...el.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	Haggai Eran <haggaie@...lanox.com>,
	Ilya Nelkenbaum <ilyan@...lanox.com>,
	Yann Droneaud <ydroneaud@...eya.com>,
	Bart Van Assche <bvanassche@....org>,
	Shachar Raindel <raindel@...lanox.com>,
	Sagi Grimberg <sagig@...lanox.com>,
	Devesh Sharma <devesh.sharma@...lex.com>,
	Matan Barak <matanb@...lanox.com>,
	Moni Shoua <monis@...lanox.com>, Jiri Kosina <jkosina@...e.cz>,
	Selvin Xavier <selvin.xavier@...lex.com>,
	Mitesh Ahuja <mitesh.ahuja@...lex.com>,
	Li RongQing <roy.qing.li@...il.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Alex Estrin <alex.estrin@...el.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Erez Shitrit <erezsh@...lanox.com>,
	Tom Gundersen <teg@...m.no>,
	Chuck Lever <chuck.lever@...cle.com>
Subject: Re: [PATCH v2 01/17] IB/Verbs: Implement new callback
 query_transport() for each HW

On Thu, 2015-04-09 at 10:01 -0600, Jason Gunthorpe wrote:
> On Thu, Apr 09, 2015 at 10:34:30AM -0400, Doug Ledford wrote:
> 
> > These are exactly the tests I proposed Jason.  I'm not sure I see your
> > point here.  I guess my point is that although the scenario of all the
> > different items seems complex, it really does boil down to needing only
> > exactly what I proposed earlier to fulfill the entire test matrix.
> 
> I have no problem with minimizing a bitmap, but I want the accessors
> to make sense first.
> 
> My specific problem with your suggestion was combining cap_ib_mad,
> cap_ib_sa, and cap_ib_smi into rdma_port_ib_fabric_mgmt.
> 
> Not only do the three cap things not return the same value for all
> situations, the documentary knowledge is lost by the reduction.
> 
> I'd prefer we look at this from a 'what do the call sites need' view,
> not a 'how do we minimize' view.
> 
> I've written this before: The mess here is that it is too hard to know
> what the call sites are actually checking for when it is some baroque
> conditional.

The two goals: being specific about what the test is returning and
minimizing the bitmap footprint; are not necessarily opposed.  One can
do both at the same time.

-- 
Doug Ledford <dledford@...hat.com>
              GPG KeyID: 0E572FDD



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