From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Subject: Re: [PATCH 0/2 RESEND] IB/Verbs: Use helpers to refine the checking
 on transport and link layer
Date: Thu, 26 Mar 2015 15:13:34 -0600
Message-ID: <20150326211334.GA3359@obsidianresearch.com>
References: <5512CFB0.1050108@profitbricks.com>
 <1427378940.21101.100.camel@redhat.com>
 <55142DFD.2060100@profitbricks.com>
 <1427387258.21101.124.camel@redhat.com>
 <55143AAC.8040206@profitbricks.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Roland Dreier <roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	Hal Rosenstock <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Ira Weiny <ira.weiny-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	Trond Myklebust <trond.myklebust-7I+n7zu2hftEKMMhf/gKZA@public.gmane.org>,
	"J. Bruce Fields" <bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>,
	"David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
	Moni Shoua <monis-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
	Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
	Tatyana Nikolova <Tatyana.E.Nikolova-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>,
	Yan Burman <yanb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
	Jack Morgenstein <jackm-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>,
	Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>,
	Yann Droneaud <ydroneaud-RlY5vtjFyJ3QT0dZR+AlfA@public.gmane.org>,
	Colin Ian King <colin.king-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>,
	Jiri Kosina <jkosina-AlSwsSmVLrQ@public.gmane.org>,
	Matan Barak <matanb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
	Majd Dibbiny <majd@mellanox.c
To: Michael Wang <yun.wang-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>
Return-path: <linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Content-Disposition: inline
In-Reply-To: <55143AAC.8040206-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>
Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
List-Id: netdev.vger.kernel.org

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
--
To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html