Re: [PATCH] rdma: not display the rdma link in other net namespace

[Leon Romanovsky <leon@kernel.org>]

On Thu, Oct 06, 2022 at 01:23:05PM -0300, Jason Gunthorpe wrote:
> On Thu, Oct 06, 2022 at 07:21:39PM +0300, Leon Romanovsky wrote:
> 
> > > And in exclusive mode, a rdma link that can not be accessed in net namespace
> > > A still
> > > 
> > > appears in net namespace A when running "rdma link show" in net namespace A.
> > > 
> > > The above is different from others in net namespace.
> > > 
> > > For example, in net namespace, if net device NIC0 is moved to net namespace
> > > B from net namespace A,
> > > 
> > > this NIC0 will not appear in net namespace A when running "ip link" command
> > > in net namespace A.
> > > 
> > > Is it a problem?
> > 
> > rdmatool presents IB devices. It has no logic that decides if that
> > device is usable/operable or not.
> 
> It should really not report an IB device that is not in the net
> namespace..

It is kernel (nldev.c) job to hide such IB devices and it seems like it
does. For devices with help of ib_enum_all_devs() and for links with
ib_device_get_by_index().

They both checks netns - rdma_dev_access_netns(device, net).

Thanks