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

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Message-ID: <553DE799.5050608@profitbricks.com>
Date:	Mon, 27 Apr 2015 09:39:05 +0200
From:	Michael Wang <yun.wang@...fitbricks.com>
To:	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>
CC:	Steve Wise <swise@...ngridcomputing.com>,
	Tom Talpey <tom@...pey.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Doug Ledford <dledford@...hat.com>,
	Ira Weiny <ira.weiny@...el.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 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 :-)

Regards,
Michael Wang

> 
> The semantics are: "check that a link supports a certain wire protocol, or a set of wire protocols", where 'certain'
> refers to the specific helper...
> 
> 
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