Message-ID: <552FD527.4060507@profitbricks.com>
Date: Thu, 16 Apr 2015 17:28:39 +0200
From: Michael Wang <yun.wang@profitbricks.com>
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To: "Hefty, Sean" <sean.hefty@intel.com>,
        Hal Rosenstock <hal@dev.mellanox.co.il>,
        Or Gerlitz <gerlitz.or@gmail.com>
CC: Roland Dreier <roland@kernel.org>,
        Hal Rosenstock <hal.rosenstock@gmail.com>,
        "linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        Tom Tucker <tom@opengridcomputing.com>,
        Steve Wise <swise@opengridcomputing.com>,
        Hoang-Nam Nguyen <hnguyen@de.ibm.com>,
        Christoph Raisch <raisch@de.ibm.com>,
        infinipath <infinipath@intel.com>, Eli Cohen <eli@mellanox.com>,
        "Latif, Faisal" <faisal.latif@intel.com>,
        Jack Morgenstein <jackm@dev.mellanox.co.il>,
        Or Gerlitz <ogerlitz@mellanox.com>, Haggai Eran <haggaie@mellanox.com>,
        "Weiny, Ira" <ira.weiny@intel.com>, Tom Talpey <tom@talpey.com>,
        Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
        Doug Ledford <dledford@redhat.com>
Subject: Re: [PATCH v3 25/28] IB/Verbs: Use management helper cap_af_ib()
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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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