netdev - Re: [PATCH v4 1/9] rdma/cm: define native IB address

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Date:	Wed, 13 Feb 2013 14:51:11 +0200
From:	Or Gerlitz <ogerlitz@...lanox.com>
To:	"Hefty, Sean" <sean.hefty@...el.com>
CC:	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David Miller (davem@...emloft.net)" <davem@...emloft.net>,
	Roland Dreier <roland@...nel.org>
Subject: Re: [PATCH v4 1/9] rdma/cm: define native IB address

On 11/02/2013 20:02, Hefty, Sean wrote:
>> Define AF_IB and sockaddr_ib to allow the rdma_cm to use native IB addressing.
>>
>> Signed-off-by: Sean Hefty <sean.hefty@...el.com>
>> ---
>>   include/linux/socket.h |    2 +
>>   include/rdma/ib.h      |   89 ++++++++++++++++++++++++++++++++++++++++++++++++
>>   2 files changed, 91 insertions(+), 0 deletions(-)
>>   create mode 100644 include/rdma/ib.h
>>
>> diff --git a/include/linux/socket.h b/include/linux/socket.h
>> index 9a546ff..17a33f7 100644
>> --- a/include/linux/socket.h
>> +++ b/include/linux/socket.h
>> @@ -167,6 +167,7 @@ struct ucred {
>>   #define AF_PPPOX	24	/* PPPoX sockets		*/
>>   #define AF_WANPIPE	25	/* Wanpipe API Sockets */
>>   #define AF_LLC		26	/* Linux LLC			*/
>> +#define AF_IB		27	/* Native InfiniBand address	*/
> ...
>
>> diff --git a/include/rdma/ib.h b/include/rdma/ib.h
> ...
>
>> +struct sockaddr_ib {
>> +	unsigned short int	sib_family;	/* AF_IB */
>> +	__be16			sib_pkey;
>> +	__be32			sib_flowinfo;
>> +	struct ib_addr		sib_addr;
>> +	__be64			sib_sid;
>> +	__be64			sib_sid_mask;
>> +	__u64			sib_scope_id;
>> +};
> Dave/Roland/anyone, is there any feedback on this approach?
>
> If there's hesitation to add new address families to socket.h, I could instead use definitions local to the rdma_cm.  This has the potential to result in conflicts if the rdma_cm is expanded for other address families, though such conflicts seem unlikely.
>
>

I don't see why not add new address family if it comes to serve a real 
world use case, which seems to be the case from the description you 
provided in the cover letter.

Or.
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