linux-kernel - Re: [PATCH v3 25/28] IB/Verbs: Use management helper cap_af

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Date:	Thu, 16 Apr 2015 17:28:39 +0200
From:	Michael Wang <yun.wang@...fitbricks.com>
To:	"Hefty, Sean" <sean.hefty@...el.com>,
	Hal Rosenstock <hal@....mellanox.co.il>,
	Or Gerlitz <gerlitz.or@...il.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 <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 25/28] IB/Verbs: Use management helper cap_af_ib()



On 04/16/2015 05:09 PM, Hefty, Sean wrote:
[snip]
>>> Sean, can you please put a precise writeup what does it take to
>>> support AF_IB... I am a bit
>>> confused here and wasn't sure if this can be supported with RoCE.
>>
>> I think this means IB GID addressing is checked (Native Infiniband
>> Address) and not AF_IB (which is socket address/protocol family like
>> INET and INET6).
>>
>> I think this naming is confusing and maybe cap_ib_gid is better ?
> 
> I need to trace back through the code to see where this is used, but I thought the check was determining if an address conveyed using sockaddr_ib applied to the port.  Sockaddr_ib was intended to target IB-classic specifically.  It should apply to RoCE/IBoE as well.  I don't think it applies to RoCEv2/IBoUDP without a translation.

The usage is:

	rdma_resolve_addr
	{
		...
                if dst_addr->sa_family == AF_IB                                       
                        cma_resolve_ib_addr --> cma_resolve_ib_dev                             
                else                                                                  
                        rdma_resolve_ip
		...
	}

So I guess IBoE using ib address rather than ip?

Regards,
Michael Wang

> 
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