[PATCH vhost v2 10/10] vdpa/mlx5: Parallelize VQ suspend/resume for CVQ MQ command

[Dragos Tatulea]

change_num_qps() is still suspending/resuming VQs one by one.
This change switches to parallel suspend/resume.

When increasing the number of queues the flow has changed a bit for
simplicity: the setup_vq() function will always be called before
resume_vqs(). If the VQ is initialized, setup_vq() will exit early. If
the VQ is not initialized, setup_vq() will create it and resume_vqs()
will resume it.

Signed-off-by: Dragos Tatulea <dtatu...@nvidia.com>
Reviewed-by: Tariq Toukan <tar...@nvidia.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c 
b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index d1a01c229110..822092eccb32 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -2229,25 +2229,27 @@ static int change_num_qps(struct mlx5_vdpa_dev *mvdev, 
int newqps)
                if (err)
                        return err;
 
-               for (i = cur_vqs - 1; i >= new_vqs; i--) {
-                       struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[i];
-
-                       if (is_resumable(ndev))
-                               suspend_vq(ndev, mvq);
-                       else
-                               teardown_vq(ndev, mvq);
+               if (is_resumable(ndev)) {
+                       suspend_vqs(ndev, new_vqs, cur_vqs - new_vqs);
+               } else {
+                       for (i = new_vqs; i < cur_vqs; i++)
+                               teardown_vq(ndev, &ndev->vqs[i]);
                }
 
                ndev->cur_num_vqs = new_vqs;
        } else {
                ndev->cur_num_vqs = new_vqs;
-               for (i = cur_vqs; i < new_vqs; i++) {
-                       struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[i];
 
-                       err = mvq->initialized ? resume_vq(ndev, mvq) : 
setup_vq(ndev, mvq, true);
+               for (i = cur_vqs; i < new_vqs; i++) {
+                       err = setup_vq(ndev, &ndev->vqs[i], false);
                        if (err)
                                goto clean_added;
                }
+
+               err = resume_vqs(ndev, cur_vqs, new_vqs - cur_vqs);
+               if (err)
+                       goto clean_added;
+
                err = modify_rqt(ndev, new_vqs);
                if (err)
                        goto clean_added;
-- 
2.45.1