netdev - Re: [PATCH v4 for-next 00/12] Add network namespace support in the RDMA-CM

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Message-ID: <556ED1E6.8050907@mellanox.com>
Date:	Wed, 3 Jun 2015 13:07:34 +0300
From:	Haggai Eran <haggaie@...lanox.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	Doug Ledford <dledford@...hat.com>, <linux-rdma@...r.kernel.org>,
	<netdev@...r.kernel.org>, Liran Liss <liranl@...lanox.com>,
	Guy Shapiro <guysh@...lanox.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Yotam Kenneth <yotamke@...lanox.com>
Subject: Re: [PATCH v4 for-next 00/12] Add network namespace support in the
 RDMA-CM

On 28/05/2015 18:46, Jason Gunthorpe wrote:
> On Thu, May 28, 2015 at 04:22:36PM +0300, Haggai Eran wrote:
>> wouldn't care if they share the "QP number namespace", etc. RDMA CM
>> ports are different because they are chosen by the applications, but
>> they map directly to the network namespace, so they don't require their
>> own namespace.
> 
> Different containers should have restricted access to the PKey and GID
> tables, and the presence device itself. Just like in the SRIOV
> case.
> 
> That is what the 'RDMA Namespace' would control.

We were thinking here that there is a room for an RDMA cgroup. It would
limit the amount of RDMA resources a container can use. It can also be
used for the restrictions you mentioned, but maybe they are more
suitable for a namespace. I'm not sure. In RoCE for instance, a
restricted access to the GID table can be derived from the network
namespace directly, but perhaps not in InfiniBand.

Regards,
Haggai
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