[PATCH vhost 15/23] vdpa/mlx5: Accept Init -> Ready VQ transition in resume_vq()

Dragos Tatulea
2024-06-17T15:09:05Z

Until now resume_vq() was used only for the suspend/resume scenario.
This change also allows calling resume_vq() to bring it from Init to
Ready state (VQ initialization).

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
---
drivers/vdpa/mlx5/net/mlx5_vnet.c | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index a2dd8fd58afa..e4d68d2d0bb4 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1557,11 +1557,31 @@ static void suspend_vqs(struct mlx5_vdpa_net *ndev)

static void resume_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq)
{
- if (!mvq->initialized || !is_resumable(ndev))
+ if (!mvq->initialized)
return;

- if (mvq->fw_state != MLX5_VIRTIO_NET_Q_OBJECT_STATE_SUSPEND)
+ switch (mvq->fw_state) {
+ case MLX5_VIRTIO_NET_Q_OBJECT_STATE_INIT:
+ /* Due to a FW quirk we need to modify the VQ fields first then change state.
+ * This should be fixed soon. After that, a single command can be used.
+ */
+ if (modify_virtqueue(ndev, mvq, 0))
+ mlx5_vdpa_warn(&ndev->mvdev,
+ "modify vq properties failed for vq %u\n", mvq->index);
+ break;
+ case MLX5_VIRTIO_NET_Q_OBJECT_STATE_SUSPEND:
+ if (!is_resumable(ndev)) {
+ mlx5_vdpa_warn(&ndev->mvdev, "vq %d is not resumable\n", mvq->index);
+ return;
+ }
+ break;
+ case MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY:
return;
+ default:
+ mlx5_vdpa_warn(&ndev->mvdev, "resume vq %u called from bad state %d\n",
+ mvq->index, mvq->fw_state);
+ return;
+ }

if (modify_virtqueue_state(ndev, mvq, MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY))
mlx5_vdpa_warn(&ndev->mvdev, "modify to resume failed for vq %u\n", mvq->index);

--
2.45.1