From: Ka-Cheong Poon <ka-cheong.poon@oracle.com>
To: Jason Gunthorpe <jgg@ziepe.ca>, Chuck Lever <chucklever@gmail.com>
Cc: Leon Romanovsky <leon@kernel.org>, linux-rdma@vger.kernel.org
Subject: Re: RDMA subsystem namespace related questions (was Re: Finding the namespace of a struct ib_device)
Date: Mon, 12 Oct 2020 16:20:40 +0800 [thread overview]
Message-ID: <4e630f85-c684-1e56-bb68-22c37872c728@oracle.com> (raw)
In-Reply-To: <20201009153406.GA5177@ziepe.ca>
On 10/9/20 11:34 PM, Jason Gunthorpe wrote:
> Yes, because namespaces are fundamentally supposed to be anchored in
> the processes inside the namespace.
>
> Having the kernel jump in and start opening holes as soon as a
> namespace is created is just wrong.
>
> At a bare minimum the listener should not exist until something in the
> namespace is willing to work with RDS.
As I mentioned in a previous email, starting is not the problem. It
is the problem of deleting a namespace. Using what is suggested
above, it means that there needs to be an explicit shutdown in
addition to the normal shutdown of a namespace. It is not clear why
this is necessary. The additional reference by rdma_create_id() puts
an unnecessary restriction on what a kernel module can do. Without
this reference, if a kernel module wants to use, say a one-to-one/many
mapping model to user space socket as suggested above, it can do that.
And if a kernel module does not want to use this model, it can also
choose to do that. It is not clear why such a restriction must be
enforced in RDMA subsystem while there is no such restriction using
kernel socket.
--
K. Poon
ka-cheong.poon@oracle.com
next prev parent reply other threads:[~2020-10-12 8:20 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-03 14:02 Finding the namespace of a struct ib_device Ka-Cheong Poon
2020-09-03 17:39 ` Jason Gunthorpe
2020-09-04 4:01 ` Ka-Cheong Poon
2020-09-04 11:32 ` Jason Gunthorpe
2020-09-04 14:02 ` Ka-Cheong Poon
2020-09-06 7:44 ` Leon Romanovsky
2020-09-07 3:33 ` Ka-Cheong Poon
2020-09-07 7:18 ` Leon Romanovsky
2020-09-07 8:24 ` Ka-Cheong Poon
2020-09-07 9:04 ` Leon Romanovsky
2020-09-07 9:28 ` Ka-Cheong Poon
2020-09-07 10:22 ` Leon Romanovsky
2020-09-07 13:48 ` Ka-Cheong Poon
2020-09-29 16:57 ` RDMA subsystem namespace related questions (was Re: Finding the namespace of a struct ib_device) Ka-Cheong Poon
2020-09-29 17:40 ` Jason Gunthorpe
2020-09-30 10:32 ` Ka-Cheong Poon
2020-10-02 14:04 ` Jason Gunthorpe
2020-10-05 10:27 ` Ka-Cheong Poon
2020-10-05 13:16 ` Jason Gunthorpe
2020-10-05 13:57 ` Ka-Cheong Poon
2020-10-05 14:25 ` Jason Gunthorpe
2020-10-05 15:02 ` Ka-Cheong Poon
2020-10-05 15:45 ` Jason Gunthorpe
2020-10-06 9:36 ` Ka-Cheong Poon
2020-10-06 12:46 ` Jason Gunthorpe
2020-10-07 8:38 ` Ka-Cheong Poon
2020-10-07 11:16 ` Leon Romanovsky
2020-10-08 10:22 ` Ka-Cheong Poon
2020-10-08 10:36 ` Leon Romanovsky
2020-10-08 11:08 ` Ka-Cheong Poon
2020-10-08 16:08 ` Jason Gunthorpe
2020-10-08 16:21 ` Chuck Lever
2020-10-08 16:46 ` Jason Gunthorpe
2020-10-09 4:49 ` Ka-Cheong Poon
2020-10-09 14:39 ` Jason Gunthorpe
2020-10-09 14:48 ` Chuck Lever
2020-10-09 14:57 ` Jason Gunthorpe
2020-10-09 15:00 ` Chuck Lever
2020-10-09 15:07 ` Jason Gunthorpe
2020-10-09 15:27 ` Chuck Lever
2020-10-09 15:34 ` Jason Gunthorpe
2020-10-09 15:52 ` Chuck Lever
2020-10-12 8:20 ` Ka-Cheong Poon [this message]
2020-10-16 18:54 ` Jason Gunthorpe
2020-10-16 20:49 ` Chuck Lever
2020-10-19 18:31 ` Jason Gunthorpe
2020-10-07 12:28 ` Jason Gunthorpe
2020-10-08 10:49 ` Ka-Cheong Poon
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