> -----Original Message-----
> From: Daniel Vetter <daniel@xxxxxxxx>
> Sent: Monday, November 30, 2020 6:58 AM
> To: Xiong, Jianxin <jianxin.xiong@xxxxxxxxx>
> Cc: linux-rdma@xxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx; Leon Romanovsky <leon@xxxxxxxxxx>; Jason Gunthorpe <jgg@xxxxxxxx>;
> Doug Ledford <dledford@xxxxxxxxxx>; Vetter, Daniel <daniel.vetter@xxxxxxxxx>; Christian Koenig <christian.koenig@xxxxxxx>
> Subject: Re: [PATCH rdma-core v3 4/6] pyverbs: Add dma-buf based MR support
>
> > +cdef class DmaBuf:
> > + def __init__(self, size, unit=0):
> > + """
> > + Allocate DmaBuf object from a GPU device. This is done through the
> > + DRI device interface. Usually this requires the effective user id
> > + being a member of the 'render' group.
> > + :param size: The size (in number of bytes) of the buffer.
> > + :param unit: The unit number of the GPU to allocate the buffer from.
> > + :return: The newly created DmaBuf object on success.
> > + """
> > + self.dmabuf_mrs = weakref.WeakSet()
> > + self.dmabuf = dmabuf_alloc(size, unit)
> > + if self.dmabuf == NULL:
> > + raise PyverbsRDMAErrno(f'Failed to allocate dmabuf of size {size} on unit {unit}')
> > + self.dri_fd = dmabuf_get_dri_fd(<dmabuf *>self.dmabuf)
>
> dri_fd seems unused by the tests
It's used by the read/write methods of the DmaBufMR class for performing mmap.
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