[PATCH vhost 10/23] vdpa/mlx5: Add support for modifying the VQ features field

Dragos Tatulea
2024-06-17T15:08:45Z

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

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
---
drivers/vdpa/mlx5/net/mlx5_vnet.c | 12 +++++++++++-
include/linux/mlx5/mlx5_ifc_vdpa.h | 1 +
2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index b60e8897717b..245b5dac98d3 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1287,6 +1287,15 @@ static int modify_virtqueue(struct mlx5_vdpa_net *ndev,
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_QUEUE_FEATURES) {
+ u16 mlx_features = get_features(ndev->mvdev.actual_features);
+
+ MLX5_SET(virtio_net_q_object, obj_context, queue_feature_bit_mask_12_3,
+ mlx_features >> 3);
+ MLX5_SET(virtio_net_q_object, obj_context, queue_feature_bit_mask_2_0,
+ mlx_features & 7);
+ }
+
if (mvq->modified_fields & MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_MKEY) {
vq_mr = mvdev->mr[mvdev->group2asid[MLX5_VDPA_DATAVQ_GROUP]];

@@ -2734,7 +2743,8 @@ static int mlx5_vdpa_set_driver_features(struct vdpa_device *vdev, u64 features)
struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[i];

mvq->modified_fields |= (
- MLX5_VIRTQ_MODIFY_MASK_QUEUE_VIRTIO_VERSION
+ MLX5_VIRTQ_MODIFY_MASK_QUEUE_VIRTIO_VERSION |
+ MLX5_VIRTQ_MODIFY_MASK_QUEUE_FEATURES
);
}
}
diff --git a/include/linux/mlx5/mlx5_ifc_vdpa.h b/include/linux/mlx5/mlx5_ifc_vdpa.h
index 34f27c01cec9..58dfa2ee7c83 100644
--- a/include/linux/mlx5/mlx5_ifc_vdpa.h
+++ b/include/linux/mlx5/mlx5_ifc_vdpa.h
@@ -150,6 +150,7 @@ enum {
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_QUEUE_FEATURES = (u64)1 << 12,
MLX5_VIRTQ_MODIFY_MASK_DESC_GROUP_MKEY = (u64)1 << 14,
};

--
2.45.1