[PATCH vhost v2 10/24] vdpa/mlx5: Add support for modifying the virtio_version VQ field

[Dragos Tatulea]

This is done in preparation for the pre-creation of hardware virtqueues
at device add time.

Signed-off-by: Dragos Tatulea <dtatu...@nvidia.com>
Reviewed-by: Cosmin Ratiu <cra...@nvidia.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c  | 16 ++++++++++++++++
 include/linux/mlx5/mlx5_ifc_vdpa.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c 
b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 739c2886fc33..b104849f8477 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1283,6 +1283,10 @@ static int modify_virtqueue(struct mlx5_vdpa_net *ndev,
        if (mvq->modified_fields & MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_USED_IDX)
                MLX5_SET(virtio_net_q_object, obj_context, hw_used_index, 
mvq->used_idx);
 
+       if (mvq->modified_fields & MLX5_VIRTQ_MODIFY_MASK_QUEUE_VIRTIO_VERSION)
+               MLX5_SET(virtio_q, vq_ctx, virtio_version_1_0,
+                       !!(ndev->mvdev.actual_features & 
BIT_ULL(VIRTIO_F_VERSION_1)));
+
        if (mvq->modified_fields & MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_MKEY) {
                vq_mr = mvdev->mr[mvdev->group2asid[MLX5_VDPA_DATAVQ_GROUP]];
 
@@ -2709,6 +2713,7 @@ static int mlx5_vdpa_set_driver_features(struct 
vdpa_device *vdev, u64 features)
 {
        struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
        struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
+       u64 old_features = mvdev->actual_features;
        int err;
 
        print_features(mvdev, features, true);
@@ -2723,6 +2728,17 @@ static int mlx5_vdpa_set_driver_features(struct 
vdpa_device *vdev, u64 features)
        else
                ndev->rqt_size = 1;
 
+       /* Interested in changes of vq features only. */
+       if (get_features(old_features) != get_features(mvdev->actual_features)) 
{
+               for (int i = 0; i < mvdev->max_vqs; ++i) {
+                       struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[i];
+
+                       mvq->modified_fields |= (
+                               MLX5_VIRTQ_MODIFY_MASK_QUEUE_VIRTIO_VERSION
+                       );
+               }
+       }
+
        update_cvq_info(mvdev);
        return err;
 }
diff --git a/include/linux/mlx5/mlx5_ifc_vdpa.h 
b/include/linux/mlx5/mlx5_ifc_vdpa.h
index 40371c916cf9..34f27c01cec9 100644
--- a/include/linux/mlx5/mlx5_ifc_vdpa.h
+++ b/include/linux/mlx5/mlx5_ifc_vdpa.h
@@ -148,6 +148,7 @@ enum {
        MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_ADDRS           = (u64)1 << 6,
        MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_AVAIL_IDX       = (u64)1 << 7,
        MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_USED_IDX        = (u64)1 << 8,
+       MLX5_VIRTQ_MODIFY_MASK_QUEUE_VIRTIO_VERSION     = (u64)1 << 10,
        MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_MKEY            = (u64)1 << 11,
        MLX5_VIRTQ_MODIFY_MASK_DESC_GROUP_MKEY          = (u64)1 << 14,
 };

-- 
2.45.1