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

Thu, Jul 16, 2026 at 03:23:01PM +0200, jiri@resnulli.us wrote:

From: Jiri Pirko <redacted>

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!