Re: [PATCH rdma-core 3/5] pyverbs: Add dma-buf based MR support

Jason Gunthorpe
2020-11-26T00:00:25Z

On Wed, Nov 25, 2020 at 07:27:07PM +0000, Xiong, Jianxin wrote:
> > From: Jason Gunthorpe <jgg@ziepe.ca>
> > Sent: Wednesday, November 25, 2020 4:15 AM
> > To: Daniel Vetter <daniel@ffwll.ch>
> > Cc: Xiong, Jianxin <jianxin.xiong@intel.com>; Leon Romanovsky <leon@kernel.org>; linux-rdma@vger.kernel.org; dri-
> > devel@lists.freedesktop.org; Doug Ledford <dledford@redhat.com>; Vetter, Daniel <daniel.vetter@intel.com>; Christian Koenig
> > <christian.koenig@amd.com>
> > Subject: Re: [PATCH rdma-core 3/5] pyverbs: Add dma-buf based MR support
> >
> > On Wed, Nov 25, 2020 at 11:50:41AM +0100, Daniel Vetter wrote:
> >
> > > Yeah imo makes sense. It's a bunch more code for you to make it work
> > > on
> > > i915 and amd, but it's not terrible. And avoids the dependencies, and
> > > also avoids the abuse of card* and dumb buffers. Plus not really more
> > > complex, you just need a table or something to match from the drm
> > > driver name to the driver-specific buffer create function. Everything
> > > else stays the same.
> >
> > If it is going to get more complicated please write it in C then. We haven't done it yet, but you can link a C function through cython to the
> > python test script
> >
> > If you struggle here I can probably work out the build system bits, but it should not be too terrible
>
> Thanks Daniel and Jason. I have started working in this direction. There should be no
> technical obstacle here.

Just to be clear I mean write some 'get dma buf fd' function in C, not
the whole test

Jason