Deleting the old mr during mr update (.set_map) and then modifying the
vqs with the new mr is not a good flow for firmware. The firmware
expects that mkeys are deleted after there are no more vqs referencing
them.
Introduce reference counting for mrs to fix this. It is the only way to
make sure that mkeys are not in use by vqs.
An mr reference is taken when the mr is associated to the mr asid table
and when the mr is linked to the vq on create/modify. The reference is
released when the mkey is unlinked from the vq (trough modify/destroy)
and from the mr asid table.
To make things consistent, get rid of mlx5_vdpa_destroy_mr and use
get/put semantics everywhere.
Reviewed-by: Gal Pressman <gal@nvidia.com>
Acked-by: Eugenio PĂ©rez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Message-Id: <
20231225151203.152687-8-dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
struct vhost_iotlb *iotlb;
bool user_mr;
+
+ refcount_t refcount;
};
struct mlx5_vdpa_resources {
struct mlx5_vdpa_mr *mlx5_vdpa_create_mr(struct mlx5_vdpa_dev *mvdev,
struct vhost_iotlb *iotlb);
void mlx5_vdpa_destroy_mr_resources(struct mlx5_vdpa_dev *mvdev);
-void mlx5_vdpa_destroy_mr(struct mlx5_vdpa_dev *mvdev,
- struct mlx5_vdpa_mr *mr);
+void mlx5_vdpa_get_mr(struct mlx5_vdpa_dev *mvdev,
+ struct mlx5_vdpa_mr *mr);
+void mlx5_vdpa_put_mr(struct mlx5_vdpa_dev *mvdev,
+ struct mlx5_vdpa_mr *mr);
void mlx5_vdpa_update_mr(struct mlx5_vdpa_dev *mvdev,
struct mlx5_vdpa_mr *mr,
unsigned int asid);
static void _mlx5_vdpa_destroy_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *mr)
{
+ if (WARN_ON(!mr))
+ return;
+
if (mr->user_mr)
destroy_user_mr(mvdev, mr);
else
destroy_dma_mr(mvdev, mr);
vhost_iotlb_free(mr->iotlb);
+
+ kfree(mr);
}
-void mlx5_vdpa_destroy_mr(struct mlx5_vdpa_dev *mvdev,
- struct mlx5_vdpa_mr *mr)
+static void _mlx5_vdpa_put_mr(struct mlx5_vdpa_dev *mvdev,
+ struct mlx5_vdpa_mr *mr)
{
if (!mr)
return;
+ if (refcount_dec_and_test(&mr->refcount))
+ _mlx5_vdpa_destroy_mr(mvdev, mr);
+}
+
+void mlx5_vdpa_put_mr(struct mlx5_vdpa_dev *mvdev,
+ struct mlx5_vdpa_mr *mr)
+{
mutex_lock(&mvdev->mr_mtx);
+ _mlx5_vdpa_put_mr(mvdev, mr);
+ mutex_unlock(&mvdev->mr_mtx);
+}
- _mlx5_vdpa_destroy_mr(mvdev, mr);
+static void _mlx5_vdpa_get_mr(struct mlx5_vdpa_dev *mvdev,
+ struct mlx5_vdpa_mr *mr)
+{
+ if (!mr)
+ return;
- for (int i = 0; i < MLX5_VDPA_NUM_AS; i++) {
- if (mvdev->mr[i] == mr)
- mvdev->mr[i] = NULL;
- }
+ refcount_inc(&mr->refcount);
+}
+void mlx5_vdpa_get_mr(struct mlx5_vdpa_dev *mvdev,
+ struct mlx5_vdpa_mr *mr)
+{
+ mutex_lock(&mvdev->mr_mtx);
+ _mlx5_vdpa_get_mr(mvdev, mr);
mutex_unlock(&mvdev->mr_mtx);
-
- kfree(mr);
}
void mlx5_vdpa_update_mr(struct mlx5_vdpa_dev *mvdev,
mutex_lock(&mvdev->mr_mtx);
+ _mlx5_vdpa_put_mr(mvdev, old_mr);
mvdev->mr[asid] = new_mr;
- if (old_mr) {
- _mlx5_vdpa_destroy_mr(mvdev, old_mr);
- kfree(old_mr);
- }
mutex_unlock(&mvdev->mr_mtx);
-
}
void mlx5_vdpa_destroy_mr_resources(struct mlx5_vdpa_dev *mvdev)
{
for (int i = 0; i < MLX5_VDPA_NUM_AS; i++)
- mlx5_vdpa_destroy_mr(mvdev, mvdev->mr[i]);
+ mlx5_vdpa_update_mr(mvdev, NULL, i);
prune_iotlb(mvdev->cvq.iotlb);
}
if (err)
goto out_err;
+ refcount_set(&mr->refcount, 1);
+
return mr;
out_err:
if (asid >= MLX5_VDPA_NUM_AS)
return -EINVAL;
- mlx5_vdpa_destroy_mr(mvdev, mvdev->mr[asid]);
+ mlx5_vdpa_update_mr(mvdev, NULL, asid);
if (asid == 0 && MLX5_CAP_GEN(mvdev->mdev, umem_uid_0)) {
if (mlx5_vdpa_create_dma_mr(mvdev))
u64 modified_fields;
+ struct mlx5_vdpa_mr *vq_mr;
+ struct mlx5_vdpa_mr *desc_mr;
+
struct msi_map map;
/* keep last in the struct */
kfree(in);
mvq->virtq_id = MLX5_GET(general_obj_out_cmd_hdr, out, obj_id);
+ mlx5_vdpa_get_mr(mvdev, vq_mr);
+ mvq->vq_mr = vq_mr;
+
+ if (vq_desc_mr && MLX5_CAP_DEV_VDPA_EMULATION(mvdev->mdev, desc_group_mkey_supported)) {
+ mlx5_vdpa_get_mr(mvdev, vq_desc_mr);
+ mvq->desc_mr = vq_desc_mr;
+ }
+
return 0;
err_cmd:
}
mvq->fw_state = MLX5_VIRTIO_NET_Q_OBJECT_NONE;
umems_destroy(ndev, mvq);
+
+ mlx5_vdpa_put_mr(&ndev->mvdev, mvq->vq_mr);
+ mvq->vq_mr = NULL;
+
+ mlx5_vdpa_put_mr(&ndev->mvdev, mvq->desc_mr);
+ mvq->desc_mr = NULL;
}
static u32 get_rqpn(struct mlx5_vdpa_virtqueue *mvq, bool fw)
int inlen = MLX5_ST_SZ_BYTES(modify_virtio_net_q_in);
u32 out[MLX5_ST_SZ_DW(modify_virtio_net_q_out)] = {};
struct mlx5_vdpa_dev *mvdev = &ndev->mvdev;
+ struct mlx5_vdpa_mr *desc_mr = NULL;
+ struct mlx5_vdpa_mr *vq_mr = NULL;
bool state_change = false;
void *obj_context;
void *cmd_hdr;
MLX5_SET(virtio_net_q_object, obj_context, hw_used_index, mvq->used_idx);
if (mvq->modified_fields & MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_MKEY) {
- struct mlx5_vdpa_mr *mr = mvdev->mr[mvdev->group2asid[MLX5_VDPA_DATAVQ_GROUP]];
+ vq_mr = mvdev->mr[mvdev->group2asid[MLX5_VDPA_DATAVQ_GROUP]];
- if (mr)
- MLX5_SET(virtio_q, vq_ctx, virtio_q_mkey, mr->mkey);
+ if (vq_mr)
+ MLX5_SET(virtio_q, vq_ctx, virtio_q_mkey, vq_mr->mkey);
else
mvq->modified_fields &= ~MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_MKEY;
}
if (mvq->modified_fields & MLX5_VIRTQ_MODIFY_MASK_DESC_GROUP_MKEY) {
- struct mlx5_vdpa_mr *mr = mvdev->mr[mvdev->group2asid[MLX5_VDPA_DATAVQ_DESC_GROUP]];
+ desc_mr = mvdev->mr[mvdev->group2asid[MLX5_VDPA_DATAVQ_DESC_GROUP]];
- if (mr && MLX5_CAP_DEV_VDPA_EMULATION(mvdev->mdev, desc_group_mkey_supported))
- MLX5_SET(virtio_q, vq_ctx, desc_group_mkey, mr->mkey);
+ if (desc_mr && MLX5_CAP_DEV_VDPA_EMULATION(mvdev->mdev, desc_group_mkey_supported))
+ MLX5_SET(virtio_q, vq_ctx, desc_group_mkey, desc_mr->mkey);
else
mvq->modified_fields &= ~MLX5_VIRTQ_MODIFY_MASK_DESC_GROUP_MKEY;
}
if (state_change)
mvq->fw_state = state;
+ if (mvq->modified_fields & MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_MKEY) {
+ mlx5_vdpa_put_mr(mvdev, mvq->vq_mr);
+ mlx5_vdpa_get_mr(mvdev, vq_mr);
+ mvq->vq_mr = vq_mr;
+ }
+
+ if (mvq->modified_fields & MLX5_VIRTQ_MODIFY_MASK_DESC_GROUP_MKEY) {
+ mlx5_vdpa_put_mr(mvdev, mvq->desc_mr);
+ mlx5_vdpa_get_mr(mvdev, desc_mr);
+ mvq->desc_mr = desc_mr;
+ }
+
mvq->modified_fields = 0;
done:
return mlx5_vdpa_update_cvq_iotlb(mvdev, iotlb, asid);
out_err:
- mlx5_vdpa_destroy_mr(mvdev, new_mr);
+ mlx5_vdpa_put_mr(mvdev, new_mr);
return err;
}