On Tue, Nov 10, 2020 at 03:14:45PM +0100, Daniel Vetter wrote:
> On Fri, Nov 06, 2020 at 12:39:53PM -0400, Jason Gunthorpe wrote:
> > On Fri, Nov 06, 2020 at 04:34:07PM +, Xiong, Jianxin wrote:
> >
> > > > The user could specify a length that is beyond the dma buf, can
> > > > the dma buf leng
iel ;
> Christian Koenig
> Subject: Re: [PATCH v8 1/5] RDMA/umem: Support importing dma-buf as user
> memory region
>
> On Tue, Nov 10, 2020 at 10:27:57AM -0400, Jason Gunthorpe wrote:
> > On Tue, Nov 10, 2020 at 03:14:45PM +0100, Daniel Vetter wrote:
> > > On Fri, N
On Tue, Nov 10, 2020 at 10:27:57AM -0400, Jason Gunthorpe wrote:
> On Tue, Nov 10, 2020 at 03:14:45PM +0100, Daniel Vetter wrote:
> > On Fri, Nov 06, 2020 at 12:39:53PM -0400, Jason Gunthorpe wrote:
> > > On Fri, Nov 06, 2020 at 04:34:07PM +, Xiong, Jianxin wrote:
> > >
> > > > > The user coul
On Fri, Nov 06, 2020 at 12:39:53PM -0400, Jason Gunthorpe wrote:
> On Fri, Nov 06, 2020 at 04:34:07PM +, Xiong, Jianxin wrote:
>
> > > The user could specify a length that is beyond the dma buf, can
> > > the dma buf length be checked during get?
> >
> > In order to check the length, the buff
On Fri, Nov 06, 2020 at 04:34:07PM +, Xiong, Jianxin wrote:
> > The user could specify a length that is beyond the dma buf, can
> > the dma buf length be checked during get?
>
> In order to check the length, the buffer needs to be mapped. That can be done.
Do DMA bufs even have definitate im
Daniel
>
> Subject: Re: [PATCH v8 1/5] RDMA/umem: Support importing dma-buf as user
> memory region
>
> On Fri, Nov 06, 2020 at 04:34:07PM +, Xiong, Jianxin wrote:
>
> > > The user could specify a length that is beyond the dma buf, can the
> > > dma buf length
Daniel
>
> Subject: Re: [PATCH v8 1/5] RDMA/umem: Support importing dma-buf as user
> memory region
>
> On Thu, Nov 05, 2020 at 02:48:05PM -0800, Jianxin Xiong wrote:
> > + /* modify the sgl in-place to match umem address and length */
> > +
> > + start = ALIG
On Thu, Nov 05, 2020 at 02:48:05PM -0800, Jianxin Xiong wrote:
> + /* modify the sgl in-place to match umem address and length */
> +
> + start = ALIGN_DOWN(umem_dmabuf->umem.address, PAGE_SIZE);
> + end = ALIGN(umem_dmabuf->umem.address + umem_dmabuf->umem.length,
> + P
Dma-buf is a standard cross-driver buffer sharing mechanism that can be
used to support peer-to-peer access from RDMA devices.
Device memory exported via dma-buf is associated with a file descriptor.
This is passed to the user space as a property associated with the
buffer allocation. When the buf
