On Wed, Nov 04, 2020 at 03:09:04PM +, Bernard Metzler wrote:
> lkey of zero to pass a physical buffer, only allowed for
> kernel applications? Very nice idea I think.
It already exists, it is called the local_dma_lkey, just set
IB_DEVICE_LOCAL_DMA_LKEY and provide the value you want to use
On Wed, Nov 04, 2020 at 05:31:35PM +0100, Christoph Hellwig wrote:
> On Wed, Nov 04, 2020 at 11:52:55AM -0400, Jason Gunthorpe wrote:
> > It could work, I think a resonable ULP API would be to have some
> >
> > rdma_fill_ib_sge_from_sgl()
> > rdma_map_sge_single()
> > etc etc
> >
> > ie
On Wed, Nov 04, 2020 at 11:52:55AM -0400, Jason Gunthorpe wrote:
> It could work, I think a resonable ULP API would be to have some
>
> rdma_fill_ib_sge_from_sgl()
> rdma_map_sge_single()
> etc etc
>
> ie instead of wrappering the DMA API as-is we have a new API that
> directly builds the
On Wed, Nov 04, 2020 at 03:01:08PM +0100, Christoph Hellwig wrote:
> > Sigh. I think the proper fix is to replace addr/length with a
> > scatterlist pointer in the struct ib_sge, then have SW drivers
> > directly use the page pointer properly.
>
> The proper fix is to move the DMA mapping into
...@vger.kernel.org,
>iommu@lists.linux-foundation.org
>Subject: [EXTERNAL] Re: [PATCH 2/5] RDMA/core: remove use of
>dma_virt_ops
>
>On Wed, Nov 04, 2020 at 09:42:41AM -0400, Jason Gunthorpe wrote:
>> On Wed, Nov 04, 2020 at 10:50:49AM +0100, Christoph Hellwi
On Wed, Nov 04, 2020 at 09:42:41AM -0400, Jason Gunthorpe wrote:
> On Wed, Nov 04, 2020 at 10:50:49AM +0100, Christoph Hellwig wrote:
>
> > +int ib_dma_virt_map_sg(struct ib_device *dev, struct scatterlist *sg, int
> > nents)
> > +{
> > + struct scatterlist *s;
> > + int i;
> > +
> > +
On Wed, Nov 04, 2020 at 10:50:49AM +0100, Christoph Hellwig wrote:
> +int ib_dma_virt_map_sg(struct ib_device *dev, struct scatterlist *sg, int
> nents)
> +{
> + struct scatterlist *s;
> + int i;
> +
> + for_each_sg(sg, s, nents, i) {
> + sg_dma_address(s) =
