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

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Date:	Fri, 10 Apr 2015 10:56:52 -0400
From:	"ira.weiny" <ira.weiny@...el.com>
To:	Michael Wang <yun.wang@...fitbricks.com>
Cc:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Doug Ledford <dledford@...hat.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>,
	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 Fri, Apr 10, 2015 at 10:25:21AM +0200, Michael Wang wrote:
> On 04/10/2015 08:16 AM, ira.weiny wrote:
> > First off there are 2 separate issues here:
> > 
> > 1) We need to communicate if a port supports or requires various management
> >    support from the ib_mad, ib_cm, and/or ib_sa modules.
> > 
> > 2) We need to communicate how a addresses are formated and resolved for a
> >    particular port
> > 
> > 
> > In general I don't think we need to remove all uses of the Transport
> > or Link Layer.
> > 
> > Although we may be able to remove most of the transport uses.
> > 
> > On Wed, Apr 08, 2015 at 02:10:15PM -0600, Jason Gunthorpe wrote:
> [snip]
> > 
> >>
> >> Some of the other checks in this file revolve around pkey, I'm not
> >> sure what rocee does there? cap_pkey_supported ?
> > 
> > It seems IBoE just hardcodes the pkey to 0xffff.  I don't see it used anywhere.
> > 
> > Function where port requires "real" PKey
> > 
> > 	-- cma.c: cma_ib_init_qp_attr
> > 
> > Check rdma_port_req_pkey()?
> 
> What about cap_eth_ah() for all the cases need eth addressing handling?

That works.

> 
> > 
> > 
> > Over all for the addressing choices:
> > 
> > The "Transport" (or protocol, or whatever) is Verbs.  The Layer below Verbs
> > (OPA/IB/Eth/TCP) defines how addressing, route, and connection information is
> > generated, communicated, and used.
> > 
> > As Jason and Doug have been saying sometimes we want to know when that requires
> > SA interaction or the use of the CM protocol (or neither).  Other times we just
> > need to know what the Address format or Link Layer is.
> 
> Till now it seems like we could be able to eliminate the link layer helper in core
> layer, but I'll reserve that helper in next version, if later we do not need it anymore,
> let's erase it then ;-)
 
Eliminating Link Layer is fine if we can do it, but I still think that
something like IPoIB should check the link layer.

After sleeping on it the driver exporting cap_ipoib() does not seem _so_ bad
but I still see a distinction between ULPs like IPoIB and the other modules we
have been discussing.

Ira

> Regards,
> Michael Wang
> 
> > 
> > 
> > Ira
> > 
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