From: Jiri Pirko <jiri@resnulli.us>
To: "Michal Koutný" <mkoutny@suse.com>
Cc: linux-rdma@vger.kernel.org, cgroups@vger.kernel.org,
netdev@vger.kernel.org, linux-s390@vger.kernel.org,
linux-kselftest@vger.kernel.org, jgg@ziepe.ca, leon@kernel.org,
parav@nvidia.com, mbloch@nvidia.com, cmeiohas@nvidia.com,
roman.gushchin@linux.dev, bvanassche@acm.org,
zyjzyj2000@gmail.com, shuah@kernel.org, tj@kernel.org,
hannes@cmpxchg.org, alibuda@linux.alibaba.com,
dust.li@linux.alibaba.com, sidraya@linux.ibm.com,
wenjia@linux.ibm.com
Subject: Re: [PATCH rdma-next 08/13] RDMA/cgroup: Scope rdma cgroup device visibility to the net namespace
Date: Mon, 13 Jul 2026 11:34:10 +0200 [thread overview]
Message-ID: <alSxB0wziQnNuyfn@FV6GYCPJ69> (raw)
In-Reply-To: <ak-Z071LrWhnI5lK@localhost.localdomain>
Thu, Jul 09, 2026 at 03:04:23PM +0200, mkoutny@suse.com wrote:
>Hi.
>
>On Thu, Jul 09, 2026 at 11:55:27AM +0200, Jiri Pirko <jiri@resnulli.us> wrote:
>> index 993446ab66d0..4523c1884d67 100644
>> --- a/Documentation/admin-guide/cgroup-v2.rst
>> +++ b/Documentation/admin-guide/cgroup-v2.rst
>> @@ -2752,6 +2752,13 @@ RDMA
>> The "rdma" controller regulates the distribution and accounting of
>> RDMA resources.
>>
>> +When RDMA devices are isolated per network namespace (exclusive mode),
>> +device names are unique only within a network namespace. The device lines
>> +below are therefore scoped to the reading or writing process's network
>> +namespace: only devices accessible from that namespace are listed, and a
>> +limit is applied to the device of that name in that namespace. Configure
>> +limits from the same network namespace as the workloads.
>
>OK.
>
>> --- a/include/linux/cgroup_rdma.h
>> +++ b/include/linux/cgroup_rdma.h
>> @@ -7,6 +7,7 @@
>> #define _CGROUP_RDMA_H
>>
>> #include <linux/cgroup.h>
>> +#include <net/net_namespace.h>
>>
>> enum rdmacg_resource_type {
>> RDMACG_RESOURCE_HCA_HANDLE,
>> @@ -34,6 +35,15 @@ struct rdmacg_device {
>> struct list_head dev_node;
>> struct list_head rpools;
>> char *name;
>> + /*
>> + * Net namespace the device belongs to. @netns_shared mirrors
>> + * ib_devices_shared_netns: when true the device is visible from every
>> + * net namespace (shared mode); otherwise @net is the only namespace
>> + * that may see and configure it. @netns_shared is updated when the
>> + * sharing mode changes, so use {READ,WRITE}_ONCE() to access it.
>> + */
>> + possible_net_t net;
>> + bool netns_shared;
>
>Any reason to store the netns_shared split per device? (IIUC, it's a
>global parameter.)
No reason, changed.
Thanks!
>
>Thanks,
>Michal
next prev parent reply other threads:[~2026-07-13 9:34 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-09 9:55 [PATCH rdma-next 00/13] RDMA: Make device names unique per net namespace Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 01/13] RDMA/core: Pass the net namespace to the device name lookups Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 02/13] RDMA/core: Handle device name conflicts when changing net namespace Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 03/13] RDMA/core: Support renaming a device when changing its " Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 04/13] RDMA/nldev: Report net namespace move errors through extack Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 05/13] RDMA/nldev: Allow setting the device name while changing net namespace Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 06/13] net/smc: Look up the pnetid ib device within the " Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 07/13] RDMA/srp: Make the SRP sysfs class net namespace aware Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 08/13] RDMA/cgroup: Scope rdma cgroup device visibility to the net namespace Jiri Pirko
2026-07-09 13:04 ` Michal Koutný
2026-07-13 9:34 ` Jiri Pirko [this message]
2026-07-09 9:55 ` [PATCH rdma-next 09/13] RDMA/cma: Document that CM configfs cannot be net namespace scoped Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 10/13] RDMA/core: Document the SELinux ibendport net namespace limitation Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 11/13] RDMA/core: Make device names unique per net namespace Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 12/13] RDMA/rxe: Implement disassociate_ucontext callback Jiri Pirko
2026-07-10 4:21 ` Zhu Yanjun
2026-07-09 9:55 ` [PATCH rdma-next 13/13] RDMA/selftests: Add rxe_netns_names test Jiri Pirko
2026-07-10 4:24 ` Zhu Yanjun
2026-07-13 8:58 ` Jiri Pirko
2026-07-10 23:51 ` yanjun.zhu
2026-07-13 9:02 ` Jiri Pirko
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