linux-kernel - Re: [PATCH v3 04/28] IB/Verbs: Reform IB-core cm

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Date:	Mon, 13 Apr 2015 15:52:17 -0400
From:	"ira.weiny" <ira.weiny@...el.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	"Hefty, Sean" <sean.hefty@...el.com>,
	Michael Wang <yun.wang@...fitbricks.com>,
	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>,
	Tom Talpey <tom@...pey.com>, Doug Ledford <dledford@...hat.com>
Subject: Re: [PATCH v3 04/28] IB/Verbs: Reform IB-core cm

On Mon, Apr 13, 2015 at 01:29:30PM -0600, Jason Gunthorpe wrote:
> On Mon, Apr 13, 2015 at 06:40:35PM +0000, Hefty, Sean wrote:
> > > > -	if (rdma_node_get_transport(ib_device->node_type) !=
> > > RDMA_TRANSPORT_IB)
> > > > -		return;
> > > > +	int count = 0;
> > > 
> > > I'm ok with this as an intermediate patch but going forward if we are
> > > going to
> > > have calls like
> > > 
> > > static inline int cap_ib_cm_dev(struct ib_device *device)
> > 
> > I would rather keep everything to checking per port, not per device.
> > Specifically, because we have code that does this:
> 
> Argee.
> 
> I asked Michael for it and stand by it, the property is per-port, not
> per device. Having the per-device tests just muddles the logic, look
> at the trouble Sean notices in #10 when we are now forced to think of
> things clearly.

What about having those be helpers within the corresponding C code?

For example move cap_ib_cm_dev() into cm.c.  Or just put the logic at the top
of cm_add_one()?

I think that having the ib_umad, ib_sa, and ib_cm modules skip devices which
have no ports which support those functions makes the code clean.  But I
understand the desire to have checks from the devices be per port.

Also for these function clean up patches we preserve the existing logic.

Ira

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