Tested pass with virtio-net regression tests,everything works fine.
Tested-by: Lei Yang <leiy...@redhat.com>
On Thu, Aug 21, 2025 at 2:50 PM Jason Wang <jasow...@redhat.com> wrote:
>
> Hi all:
>
> Virtio used to be coupled with DMA API. This works fine for the device
> that do real DMA but not the others. For example, VDUSE nees to craft
> with DMA API in order to let the virtio-vdpa driver to work.
>
> This series tries to solve this issue by introducing the mapping API
> in the virtio core. So transport like vDPA can implement their own
> mapping logic without the need to hack with DMA API. The mapping API
> are abstracted with a new map operations in order to be re-used by
> transprot or device. So device like VDUSE can implement its own
> mapping loigc.
>
> For device that uses DMA (for example PCI device), the virtio core
> will still call DMA API directly without the need of implementing map
> ops per device/transport.
>
> Please review.
>
> Changes since V5:
>
> - Rename mapping_token to virtio_map
> - Do not use opaque void * pointer, just use a forward decalration of
> vduse_iova_domain
> - Remove unused variable and typo fixes
>
> Changes since V4:
>
> - Rename map_token to mapping_token
> - Introduce a union container for opaque token as well as the DMA
> device so we won't lose the type safety
> - Do not try to set DMA mask for VDUSE device
> - Introduce a new mapper_error op for API completeness
>
> Changes since V3:
>
> - Fix build error of PDS vDPA driver
>
> Changes since V2:
>
> - Drop VDUSE dependenct for HAS_DMA and ARCH_HAS_DMA_OPS
>
> Changes since V1:
>
> - Fix build error of mlx5_vdpa driver
>
>
> Jason Wang (9):
> virtio_ring: constify virtqueue pointer for DMA helpers
> virtio_ring: switch to use dma_{map|unmap}_page()
> virtio: rename dma helpers
> virtio: introduce virtio_map container union
> virtio_ring: rename dma_handle to map_handle
> virtio: introduce map ops in virtio core
> vdpa: support virtio_map
> vdpa: introduce map ops
> vduse: switch to use virtio map API instead of DMA API
>
> drivers/net/virtio_net.c | 28 +-
> drivers/vdpa/Kconfig | 8 +-
> drivers/vdpa/alibaba/eni_vdpa.c | 5 +-
> drivers/vdpa/ifcvf/ifcvf_main.c | 5 +-
> drivers/vdpa/mlx5/core/mr.c | 4 +-
> drivers/vdpa/mlx5/net/mlx5_vnet.c | 15 +-
> drivers/vdpa/octeon_ep/octep_vdpa_main.c | 6 +-
> drivers/vdpa/pds/vdpa_dev.c | 5 +-
> drivers/vdpa/solidrun/snet_main.c | 8 +-
> drivers/vdpa/vdpa.c | 5 +-
> drivers/vdpa/vdpa_sim/vdpa_sim.c | 4 +-
> drivers/vdpa/vdpa_user/iova_domain.c | 2 +-
> drivers/vdpa/vdpa_user/iova_domain.h | 2 +-
> drivers/vdpa/vdpa_user/vduse_dev.c | 79 ++--
> drivers/vdpa/virtio_pci/vp_vdpa.c | 5 +-
> drivers/vhost/vdpa.c | 6 +-
> drivers/virtio/virtio_ring.c | 459 ++++++++++++++---------
> drivers/virtio/virtio_vdpa.c | 20 +-
> include/linux/vdpa.h | 25 +-
> include/linux/virtio.h | 46 ++-
> include/linux/virtio_config.h | 72 ++++
> include/linux/virtio_ring.h | 7 +-
> 22 files changed, 531 insertions(+), 285 deletions(-)
>
> --
> 2.31.1
>
>
