netdev - Re: [PATCH v2 00/11] Add network namespace support in the RDMA-CM

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Date:	Tue, 21 Apr 2015 09:11:57 -0500
From:	Steve Wise <swise@...ngridcomputing.com>
To:	Haggai Eran <haggaie@...lanox.com>,
	Doug Ledford <dledford@...hat.com>,
	Roland Dreier <roland@...nel.org>
CC:	Sean Hefty <sean.hefty@...el.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 v2 00/11] Add network namespace support in the RDMA-CM

On 4/21/2015 1:36 AM, Haggai Eran wrote:
> On 20/04/2015 17:53, Steve Wise wrote:
>> Hey Haggai,
>>
>> Did you check for changes needed in drivers/infiniband/core/iwcm.c?
> We focused on namespace support for InfiniBand alone in this series. We
> didn't handle iWARP, nor did we implement support for RoCE or other
> transports.
>
>> I notice that it uses init_net here:
>>
>> static int __init iw_cm_init(void)
>> {
>>          iwcm_wq = create_singlethread_workqueue("iw_cm_wq");
>>          if (!iwcm_wq)
>>                  return -ENOMEM;
>>
>>          iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm",
>>                                                   iwcm_ctl_table);
>>          if (!iwcm_ctl_table_hdr) {
>>                  pr_err("iw_cm: couldn't register sysctl paths\n");
>>                  destroy_workqueue(iwcm_wq);
>>                  return -ENOMEM;
>>          }
>>
>>          return 0;
>> }
>>
> I see the only thing in the iWARP sysctl registered here is the default
> backlog. If you want to control this parameter per namespace, we could
> store it per network namespace, and add a namespace parameter to
> iw_cm_listen. I'm not sure how important this is though.

I don't think it needs to be per namespace, as long as it still applies 
across all name spaces.

Steve.
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