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().
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
