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

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Date:	Thu, 09 Apr 2015 10:34:30 -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 Wed, 2015-04-08 at 14:10 -0600, Jason Gunthorpe wrote:
> On Wed, Apr 08, 2015 at 02:29:46PM -0400, Doug Ledford wrote:
> 
> > To straighten all this out, lets break management out into the two
> > distinct types:
> > 
> > rdma_port_ib_fabric_mgmt() <- fabric specific management tasks: MAD, SM,
> > multicast.  The proper test for this with my bitmap above is a simple
> > transport & RDMA_MGMT_IB test.  If will be true for IB and OPA fabrics.
> 
> > rdma_port_conn_mgmt() <- connection management, which we currently
> > support everything except USNIC (correct Sean?), so a test would be
> > something like !(transport & RDMA_TRANSPORT_USNIC).  This is then split
> > out into two subgroups, IB style and iWARP stype connection management
> > (aka, rdma_port_iw_conn_mgmt() and rdma_port_ib_conn_mgmt()).  In my
> > above bitmap, since I didn't give IBOE its own transport type, these
> > subgroups still boil down to the simple tests transport & iWARP and
> > transport & IB like they do today.
> 
> There is a lot more variation here than just these two tests, and those
> two tests won't scale to include OPA.
> 
>         IB ROCEE OPA
> SMI     Y  N     Y    (though the OPA smi looked a bit different)
> IB SMP  Y  N     N
> OPA SMP N  N     Y
> GMP     Y  Y     Y
> SA      Y  N     Y
> PM      Y  Y     Y    (? guessing for OPA)
> CM      Y  Y     Y
> GMP needs GRH N Y N
> 

You can still break this down to a manageable bitmap.

SMI, SMP, and SA are all essentially the same and can be combined to one
bitmap that is

IB_SM  0x1
OPA_SM 0x2

and the defines are such that IB devices define IB_SM, and OPA devices
define IB_SM and OPA_SM.  Any minor differences between OPA and IB can
be handled by testing just the OPA_SM bit.  This will exclude all IBOE
devices and iWARP devices.

GMP, PM, and CM are all the same, and are all identical to transport ==
INFINIBAND.

GMP needs GRH happens to be precisely the same as ib_dev_is_iboe.

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.


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



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