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vdpa/mlx5: Use suspend/resume during VQP change

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Resume a VQ if it is already created when the number of VQ pairs
increases. This is done in preparation for VQ pre-creation which is
coming in a later patch. It is necessary because calling setup_vq() on
an already created VQ will return early and will not enable the queue.

For symmetry, suspend a VQ instead of tearing it down when the number of
VQ pairs decreases. But only if the resume operation is supported.

Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Message-Id: <20240626-stage-vdpa-vq-precreate-v2-20-560c491078df@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Dragos Tatulea 2024-06-26 13:26:56 +03:00 committed by Michael S. Tsirkin
parent ac85cd904d
commit 3b3adb3bbf
1 changed files with 11 additions and 3 deletions
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14
drivers/vdpa/mlx5/net/mlx5_vnet.c
View File

@ -2130,14 +2130,22 @@ static int change_num_qps(struct mlx5_vdpa_dev *mvdev, int newqps)
if (err)
return err;
for (i = ndev->cur_num_vqs - 1; i >= 2 * newqps; i--)
teardown_vq(ndev, &ndev->vqs[i]);
for (i = ndev->cur_num_vqs - 1; i >= 2 * newqps; i--) {
struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[i];
if (is_resumable(ndev))
suspend_vq(ndev, mvq);
else
teardown_vq(ndev, mvq);
}
ndev->cur_num_vqs = 2 * newqps;
} else {
ndev->cur_num_vqs = 2 * newqps;
for (i = cur_qps * 2; i < 2 * newqps; i++) {
err = setup_vq(ndev, &ndev->vqs[i], true);
struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[i];
err = mvq->initialized ? resume_vq(ndev, mvq) : setup_vq(ndev, mvq, true);
if (err)
goto clean_added;
}