linux-kernel - Re: [PATCH v6 01/26] IB/Verbs: Implement new callback query

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Date:	Mon, 27 Apr 2015 17:52:30 -0400
From:	"ira.weiny" <ira.weiny@...el.com>
To:	Michael Wang <yun.wang@...fitbricks.com>
Cc:	Liran Liss <liranl@...lanox.com>,
	Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal@....mellanox.co.il>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Steve Wise <swise@...ngridcomputing.com>,
	Tom Talpey <tom@...pey.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Doug Ledford <dledford@...hat.com>,
	Tom Tucker <tom@...ngridcomputing.com>,
	Hoang-Nam Nguyen <hnguyen@...ibm.com>,
	"raisch@...ibm.com" <raisch@...ibm.com>,
	Mike Marciniszyn <infinipath@...el.com>,
	Eli Cohen <eli@...lanox.com>,
	Faisal Latif <faisal.latif@...el.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>
Subject: Re: [PATCH v6 01/26] IB/Verbs: Implement new callback query_transport()

On Mon, Apr 27, 2015 at 09:39:05AM +0200, Michael Wang wrote:
> 
> 
> On 04/24/2015 05:12 PM, Liran Liss wrote:
> >> From: linux-rdma-owner@...r.kernel.org [mailto:linux-rdma-
> >>
> > [snip]
> >> a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index
> >> 65994a1..d54f91e 100644
> >> --- a/include/rdma/ib_verbs.h
> >> +++ b/include/rdma/ib_verbs.h
> >> @@ -75,10 +75,13 @@ enum rdma_node_type {  };
> >>
> >>  enum rdma_transport_type {
> >> +	/* legacy for users */
> >>  	RDMA_TRANSPORT_IB,
> >>  	RDMA_TRANSPORT_IWARP,
> >>  	RDMA_TRANSPORT_USNIC,
> >> -	RDMA_TRANSPORT_USNIC_UDP
> >> +	RDMA_TRANSPORT_USNIC_UDP,
> >> +	/* new transport */
> >> +	RDMA_TRANSPORT_IBOE,
> > 
> > Remove RDMA_TRANSPORT_IBOE - it is not a transport.
> > ROCE uses IBTA transport.
> > 
> > If any code should test for ROCE should invoke a specific helper, e.g., rdma_protocol_iboe().
> > This is  what you currently call "rdma_tech_iboe" is patch 02/26.
> > 
> > I think that pretty much everybody agrees that rdma_protocol_*() is a better name than rdma_tech_*(), right?
> > So, let's change this.
> 
> Sure, sounds reasonable now, about the IBOE, we still need it to
> separate the port support IB/ETH without the check on link-layer,
> So what about a new enum on protocol type?
> 
> Like:
> 
> enum rdma_protocol {
> 	RDMA_PROTOCOL_IB,
> 	RDMA_PROTOCOL_IBOE,
> 	RDMA_PROTOCOL_IWARP,
> 	RDMA_PROTOCOL_USNIC_UDP
> };
> 
> So we could use query_protocol() to ask device provide the protocol
> type, and there will be no mixing with the legacy transport type
> anymore :-)

I'm ok with that.  I like introducing a unique namespace which is clearly
different from the previous "transport" one.

Ira

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