On Tue, 11 Jul 2023 09:05:02 -0300 Jason Gunthorpe wrote: > On Tue, Jul 11, 2023 at 07:04:45AM +0200, Christoph Hellwig wrote: > > On Mon, Jul 10, 2023 at 09:59:06PM -0700, Jakub Kicinski wrote: > > > Noob question - how does RDMA integrate with the out of tree junk? > > > AFAIU it's possible to run the "in-tree" RDMA stack and get "GPU > > > direct". > > > > I don't care and it has absolutel no business being discussed here. My question was genuine. If you think the code is dog shit I will make no argument for merging it. I just get hives from looking at proprietary code so I was hoping someone could explain how the proprietary stacks get it done. > > FYI at leat iWarp is a totally open standard. And I'm sure someone cares about that. I care about open source. I think people in the networking world have a deeper understanding of standardization processes, and their practical implication for open source and hack-ability. If all usable implementations are proprietary the standard could as well not exist. That may be a little hard to understand for folks coming from storage and fabric worlds where the interesting bits of the implementation was pretty much always closed. > So is Infiniband, Jakub has a unique definition of "proprietary". For IB AFAIU there's only one practically usable vendor, such an impressive ecosystem!! > RDMA works with the AMD and Intel intree drivers using DMABUF without > requiring struct pages using the DRM hacky scatterlist approach. I see, thanks. We need pages primarily for refcounting. Avoiding all the infamous problems with memory pins. Oh well.
