Re: [PATCH v4 04/15] vdpa/mlx5: support event qp reuse

[Maxime Coquelin <maxime.coquelin@redhat.com>]

On 6/18/22 11:02, Li Zhang wrote:
> From: Yajun Wu <yajunw@nvidia.com>
> 
> To speed up queue create time, event qp and cq will create only once.
> Each virtq creation will reuse same event qp and cq.
> 
> Because FW will set event qp to error state during virtq destroy,
> need modify event qp to RESET state, then modify qp to RTS state as
> usual. This can save about 1.5ms for each virtq creation.
> 
> After SW qp reset, qp pi/ci all become 0 while cq pi/ci keep as
> previous. Add new variable qp_ci to save SW qp ci. Move qp pi
> independently with cq ci.
> 
> Add new function mlx5_vdpa_drain_cq to drain cq CQE after virtq
> release.
> 
> Signed-off-by: Yajun Wu <yajunw@nvidia.com>
> Acked-by: Matan Azrad <matan@nvidia.com>
> ---
>   drivers/vdpa/mlx5/mlx5_vdpa.c       |  8 ++++
>   drivers/vdpa/mlx5/mlx5_vdpa.h       | 12 +++++-
>   drivers/vdpa/mlx5/mlx5_vdpa_event.c | 60 +++++++++++++++++++++++++++--
>   drivers/vdpa/mlx5/mlx5_vdpa_virtq.c |  6 +--
>   4 files changed, 78 insertions(+), 8 deletions(-)
> 

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime