On 6/16/22 04:29, Li Zhang wrote:
From: Yajun Wu <yaj...@nvidia.com> The motivation of this change is to reduce vDPA device queue creation time by create some queue resource in vDPA device probe stage.
s/create/creating/
In VM live migration scenario, this can reduce 0.8ms for each queue creation, thus reduce LM network downtime. To create queue resource(umem/counter) in advance, we need to know virtio queue depth and max number of queue VM will use. Introduce two new devargs: queues(max queue pair number) and queue_size (queue depth). Two args must be both provided, if only one argument provided, the argument will be ignored and no pre-creation. The queues and queue_size must also be identical to vhost configuration driver later receive. Otherwise either the pre-create resource is wasted or missing or the resource need destroy and recreate(in case queue_size mismatch). Pre-create umem/counter will keep alive until vDPA device removal. Signed-off-by: Yajun Wu <yaj...@nvidia.com> Acked-by: Matan Azrad <ma...@nvidia.com> --- doc/guides/vdpadevs/mlx5.rst | 14 +++++++ drivers/vdpa/mlx5/mlx5_vdpa.c | 75 ++++++++++++++++++++++++++++++++++- drivers/vdpa/mlx5/mlx5_vdpa.h | 2 + 3 files changed, 89 insertions(+), 2 deletions(-)
Reviewed-by: Maxime Coquelin <maxime.coque...@redhat.com> Thanks, Maxime
