Virtualization - Mar 2022 - [PATCH v2 0/9] virtio: support advance DMA

On Thu, Feb 24, 2022 at 07:03:53PM +0800, Xuan Zhuo
wrote:
> virtqueue_add() only supports virtual addresses, dma is completed in
> virtqueue_add().
> 
> In some scenarios (such as the AF_XDP scenario), DMA is completed in
advance, so
> it is necessary for us to support passing the DMA address to
virtqueue_add().
I picked up a couple of patches. Others are waiting for some acks
(Jason?) and improved commit logs for documentation.

Thanks!
> v2:
>     1. rename predma -> premapped
>     2. virtio net xdp tx use virtio dma api
> 
> v1:
>    1. All sgs requested at one time are required to be unified PREDMA, and
several
>       of them are not supported to be PREDMA
>    2. virtio_dma_map() is removed from this patch set and will be submitted
>       together with the next time AF_XDP supports virtio dma
>    3. Added patch #2 #3 to remove the check for flags when performing unmap
>       indirect desc
> 
> Xuan Zhuo (9):
>   virtio_ring: rename vring_unmap_state_packed() to
>     vring_unmap_extra_packed()
>   virtio_ring: remove flags check for unmap split indirect desc
>   virtio_ring: remove flags check for unmap packed indirect desc
>   virtio_ring: virtqueue_add() support premapped
>   virtio_ring: split: virtqueue_add_split() support premapped
>   virtio_ring: packed: virtqueue_add_packed() support premapped
>   virtio_ring: add api virtio_dma_map() for advance dma
>   virtio_ring: introduce virtqueue_add_outbuf_premapped()
>   virtio_net: xdp xmit use virtio dma api
> 
>  drivers/net/virtio_net.c     |  42 +++++-
>  drivers/virtio/virtio_ring.c | 280 ++++++++++++++++++++++++++---------
>  include/linux/virtio.h       |  12 ++
>  3 files changed, 254 insertions(+), 80 deletions(-)
> 
> --
> 2.31.0

On Wed, Mar 30, 2022 at 2:34 PM Michael S. Tsirkin <mst at redhat.com>
wrote:
>
> On Thu, Feb 24, 2022 at 07:03:53PM +0800, Xuan Zhuo wrote:
> > virtqueue_add() only supports virtual addresses, dma is completed in
> > virtqueue_add().
> >
> > In some scenarios (such as the AF_XDP scenario), DMA is completed in
advance, so
> > it is necessary for us to support passing the DMA address to
virtqueue_add().
>
> I picked up a couple of patches. Others are waiting for some acks
> (Jason?) and improved commit logs for documentation.
I will review them.

Thanks
>
> Thanks!
>
> > v2:
> >     1. rename predma -> premapped
> >     2. virtio net xdp tx use virtio dma api
> >
> > v1:
> >    1. All sgs requested at one time are required to be unified PREDMA,
and several
> >       of them are not supported to be PREDMA
> >    2. virtio_dma_map() is removed from this patch set and will be
submitted
> >       together with the next time AF_XDP supports virtio dma
> >    3. Added patch #2 #3 to remove the check for flags when performing
unmap
> >       indirect desc
> >
> > Xuan Zhuo (9):
> >   virtio_ring: rename vring_unmap_state_packed() to
> >     vring_unmap_extra_packed()
> >   virtio_ring: remove flags check for unmap split indirect desc
> >   virtio_ring: remove flags check for unmap packed indirect desc
> >   virtio_ring: virtqueue_add() support premapped
> >   virtio_ring: split: virtqueue_add_split() support premapped
> >   virtio_ring: packed: virtqueue_add_packed() support premapped
> >   virtio_ring: add api virtio_dma_map() for advance dma
> >   virtio_ring: introduce virtqueue_add_outbuf_premapped()
> >   virtio_net: xdp xmit use virtio dma api
> >
> >  drivers/net/virtio_net.c     |  42 +++++-
> >  drivers/virtio/virtio_ring.c | 280
++++++++++++++++++++++++++---------
> >  include/linux/virtio.h       |  12 ++
> >  3 files changed, 254 insertions(+), 80 deletions(-)
> >
> > --
> > 2.31.0
>