RDMA/core: Allow port_groups to be used with namespaces

Now that the port_groups data is being destroyed and managed by the core
code this restriction is no longer needed. All the ib_port_attrs are
compatible with the core's sysfs lifecycle.

When the main device is destroyed and moved to another namespace the
driver's port sysfs can be created/destroyed as well due to it now being a
simple attribute list.

Link: https://lore.kernel.org/r/afd8b676eace2821692d44489ff71856277c48d1.1623427137.git.leonro@nvidia.comSigned-off-by: NLeon Romanovsky <leonro@nvidia.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/core/device.c

@@ -1698,13 +1698,11 @@ int ib_device_set_netns_put(struct sk_buff *skb,
 	}
 
 	/*
-	 * Currently supported only for those providers which support
-	 * disassociation and don't do port specific sysfs init. Once a
-	 * port_cleanup infrastructure is implemented, this limitation will be
-	 * removed.
+	 * All the ib_clients, including uverbs, are reset when the namespace is
+	 * changed and this cannot be blocked waiting for userspace to do
+	 * something, so disassociation is mandatory.
 	 */
-	if (!dev->ops.disassociate_ucontext || dev->ops.port_groups ||
-	    ib_devices_shared_netns) {
+	if (!dev->ops.disassociate_ucontext || ib_devices_shared_netns) {
 		ret = -EOPNOTSUPP;
 		goto ns_err;
 	}