On Wed, 30 Mar 2022 14:56:17 +0800, Jason Wang <jasowang at redhat.com>
wrote:> 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.
hi, the core code of premapped, I will merge it into 'virtio pci support
VIRTIO_F_RING_RESET' because this function will be used when reusing the
buffer
after resize.
Thanks.
>
> 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
> >
>