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

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Message-ID: <20150326211334.GA3359@obsidianresearch.com>
Date:	Thu, 26 Mar 2015 15:13:34 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Michael Wang <yun.wang@...fitbricks.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 Thu, Mar 26, 2015 at 05:58:20PM +0100, Michael Wang wrote:

> The questions is just wondering how the transition method could be, but
> if we have to do the changes for vendor, that sounds like a tough job...

I would see changing how the information is represented in the struct
as a follow on issue. The first patch should go through and replace
all direct access to the link layer/transport/etc with an
appropriately narrow is_XX() test like Doug was suggesting.

That means looking at each code site and determining what it needs,
making a is_XX for it and a kdoc describing exactly what is needed for
the test to return true.

The follow on patch can then rework the is_XX and drop the link
layer/transport stuff..

Some ideas for is_XX:
  IB compatible SA
  QP0 SMP mechanism
  IB SMP format
  OPA SMP format
  QP1 GMP mechanism
  IB compatible CM
  GID addressing
  IP/IPv6 addressing
  Ethernet VLAN
  ...

Jason
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