Re: [PATCH 00/16] vdpa: Add support for vq descriptor mappings

[Dragos Tatulea]

On Tue, 2023-09-12 at 16:01 +0300, Dragos Tatulea wrote:
> This patch series adds support for vq descriptor table mappings which
> are used to improve vdpa live migration downtime. The improvement comes
> from using smaller mappings which take less time to create and destroy
> in hw.
> 
Gentle ping.

Note that I will have to send a v2. The changes in mlx5_ifc.h will need to be
merged first separately into the mlx5-next branch [0] and then pulled from there
when the series is applied.

[0]
https://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git/log/?h=mlx5-next

Thanks,
Dragos

> The first part adds the vdpa core changes from Si-Wei [0].
> 
> The second part adds support in mlx5_vdpa:
> - Refactor the mr code to be able to cleanly add descriptor mappings.
> - Add hardware descriptor mr support.
> - Properly update iotlb for cvq during ASID switch.
> 
> [0]
> https://lore.kernel.org/virtualization/1694248959-13369-1-git-send-email-si-wei.liu@xxxxxxxxxx
> 
> Dragos Tatulea (13):
>   vdpa/mlx5: Create helper function for dma mappings
>   vdpa/mlx5: Decouple cvq iotlb handling from hw mapping code
>   vdpa/mlx5: Take cvq iotlb lock during refresh
>   vdpa/mlx5: Collapse "dvq" mr add/delete functions
>   vdpa/mlx5: Rename mr destroy functions
>   vdpa/mlx5: Allow creation/deletion of any given mr struct
>   vdpa/mlx5: Move mr mutex out of mr struct
>   vdpa/mlx5: Improve mr update flow
>   vdpa/mlx5: Introduce mr for vq descriptor
>   vdpa/mlx5: Enable hw support for vq descriptor mapping
>   vdpa/mlx5: Make iotlb helper functions more generic
>   vdpa/mlx5: Update cvq iotlb mapping on ASID change
>   Cover letter: vdpa/mlx5: Add support for vq descriptor mappings
> 
> Si-Wei Liu (3):
>   vdpa: introduce dedicated descriptor group for virtqueue
>   vhost-vdpa: introduce descriptor group backend feature
>   vhost-vdpa: uAPI to get dedicated descriptor group id
> 
>  drivers/vdpa/mlx5/core/mlx5_vdpa.h |  31 +++--
>  drivers/vdpa/mlx5/core/mr.c        | 191 ++++++++++++++++-------------
>  drivers/vdpa/mlx5/core/resources.c |   6 +-
>  drivers/vdpa/mlx5/net/mlx5_vnet.c  | 100 ++++++++++-----
>  drivers/vhost/vdpa.c               |  27 ++++
>  include/linux/mlx5/mlx5_ifc.h      |   8 +-
>  include/linux/mlx5/mlx5_ifc_vdpa.h |   7 +-
>  include/linux/vdpa.h               |  11 ++
>  include/uapi/linux/vhost.h         |   8 ++
>  include/uapi/linux/vhost_types.h   |   5 +
>  10 files changed, 264 insertions(+), 130 deletions(-)
>