linux-kernel - RE: [PATCH v3 01/28] IB/Verbs: Implement new callback query

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Message-ID: <1828884A29C6694DAF28B7E6B8A82373A8FC1C7C@ORSMSX109.amr.corp.intel.com>
Date:	Wed, 15 Apr 2015 19:29:31 +0000
From:	"Hefty, Sean" <sean.hefty@...el.com>
To:	Hal Rosenstock <hal@....mellanox.co.il>,
	Michael Wang <yun.wang@...fitbricks.com>
CC:	Roland Dreier <roland@...nel.org>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tom Tucker <tom@...ngridcomputing.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	Hoang-Nam Nguyen <hnguyen@...ibm.com>,
	Christoph Raisch <raisch@...ibm.com>,
	infinipath <infinipath@...el.com>, Eli Cohen <eli@...lanox.com>,
	"Latif, Faisal" <faisal.latif@...el.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	"Or Gerlitz" <ogerlitz@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>,
	"Weiny, Ira" <ira.weiny@...el.com>, Tom Talpey <tom@...pey.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Doug Ledford <dledford@...hat.com>
Subject: RE: [PATCH v3 01/28] IB/Verbs: Implement new callback
 query_transport()

> libibverbs also exposes transport at the device level. Isn't a change to
> make transport per port rather than per device needed there as well to
> be consistent with these proposed kernel changes ? If so, would the
> additional IBoE transport be exposed ? We also need to worry about
> backward compatibility for existing applications.

Libibverbs probably can't change without bumping the major version number.  If the kernel attribute structures change, this is probably something that the user_verbs module would need to handle to avoid breaking the ABI.

- Sean