Re: [PATCH rdma-next v3 00/14] RDMA: Make device names unique per net namespace

[Leon Romanovsky <leon@kernel.org>]

On Wed, Jul 22, 2026 at 01:19:00PM +0200, Jiri Pirko wrote:
> Thu, Jul 16, 2026 at 03:23:01PM +0200, jiri@resnulli.us wrote:
> >From: Jiri Pirko <jiri@nvidia.com>
> >
> >RDMA device names are unique system-wide today:
> >__ib_device_get_by_name() checks a requested name against every
> >registered device regardless of the network namespace it lives in.
> >A device in one network namespace therefore cannot use a name already
> >taken in another, even in exclusive netns mode (netns_mode=0) where
> >the two are otherwise isolated. Net devices have no such restriction -
> >their names only need to be unique within a network namespace.
> >
> >This series makes RDMA device names unique per network namespace,
> >matching net device semantics, and adapts the users that assumed
> >system-wide unique names.
> >
> >Scoping reuses the existing rdma_dev_access_netns() predicate, so
> >behavior only changes in exclusive mode:
> >  - shared mode (default): names stay unique system-wide, no change;
> >  - exclusive mode: names only need to be unique within a namespace;
> >  - CONFIG_NET_NS=n: everything is init_net, names stay system-wide
> >    unique.
> >
> >There are two users that cannot be made per-namespace and are
> >documented as known limitations instead of changed:
> >  - the rdma_cm configfs tree: configfs has no network namespace
> >    support, so it cannot represent two same-named devices;
> >  - SELinux ibendport labelling: endports are labelled by (device
> >    name, port) from a global policy; distinguishing same-named
> >    devices would need net namespace support in the SELinux policy
> >    language and tooling.
> >
> >Tested with the new rxe_netns_names kselftest added in the last patch.
> 
> This looks like good to go. All Sashiko findings are false positive or
> unrelated. Care to merge? Thanks!

We usually take extra time before merging complex changes touching
core or UAPI code.

Thanks