Re: [RFC] RDMA/irdma: Add support for revocable dmabuf import

[Leon Romanovsky <leon@kernel.org>]

On Tue, Feb 17, 2026 at 07:21:58PM -0400, Jason Gunthorpe wrote:
> On Tue, Feb 17, 2026 at 06:08:54PM -0500, Jacob Moroni wrote:
> > Hi,
> > 
> > Thanks for taking a look.

<...>

> > Should I create a new kernel device method for this? If so, then I wonder if
> > it makes sense to expose it as a generic "invalidate_mr" method and let
> > the drivers choose now to actually implement it (many can probably just
> > forward the call to their internal rereg_mr logic).
> 
> I have on and off thought about doing something like that with rereg
> mr as it would be more general, but I think for now just extending the
> ib_umem_dmabuf_get_pinned() is reasonable, and avoids the races.

I'm in the camp that, sooner or later, we will need a generic solution in
ib_core to handle this. More and more drivers now support dmabuf in RDMA,
and most of them lack ODP, so they will all need to implement
invalidate_mr at some point.

That said, starting with the simplest reasonable approach and refactoring
later sounds fine.

Thanks