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[156.34.48.30]) by smtp.gmail.com with ESMTPSA id o4sm2484865qko.120.2020.10.06.05.46.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Oct 2020 05:46:28 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kPmMN-000WQj-Kt; Tue, 06 Oct 2020 09:46:27 -0300 Date: Tue, 6 Oct 2020 09:46:27 -0300 From: Jason Gunthorpe To: Ka-Cheong Poon Cc: linux-rdma@vger.kernel.org Subject: Re: RDMA subsystem namespace related questions (was Re: Finding the namespace of a struct ib_device) Message-ID: <20201006124627.GH5177@ziepe.ca> References: <20200929174037.GW9916@ziepe.ca> <2859e4a8-777b-48a5-d3c6-2f2effbebef9@oracle.com> <20201002140445.GJ9916@ziepe.ca> <5ab6e8df-851a-32f2-d64a-96e8d6cf0bc7@oracle.com> <20201005131611.GR9916@ziepe.ca> <4bf4bcd7-4aa4-82b9-8d03-c3ded1098c76@oracle.com> <20201005142554.GS9916@ziepe.ca> <3e9497cb-1ccd-2bc0-bbca-41232ebd6167@oracle.com> <20201005154548.GT9916@ziepe.ca> <765ff6f8-1cba-0f12-937b-c8893e1466e7@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <765ff6f8-1cba-0f12-937b-c8893e1466e7@oracle.com> Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Tue, Oct 06, 2020 at 05:36:32PM +0800, Ka-Cheong Poon wrote: > > > > Kernel modules should not be doing networking unless commanded to by > > > > userspace. > > > > > > It is still not clear why this is an issue with RDMA > > > connection, but not with general kernel socket. It is > > > not random networking. There is a purpose. > > > > It is a problem with sockets too, how do the socket users trigger > > their socket usages? AFAIK all cases originate with userspace > > A user starts a namespace. The module is loaded for servicing > requests. The module starts a listener. The user deletes > the namespace. This scenario will have everything cleaned up > properly if the listener is a kernel socket. This is not the > case with RDMA. Please point to reputable code in upstream doing this Jason