On Fri, Jun 14, 2024 at 2:40 PM Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> wrote:
>
> xsk wakeup is used to trigger the logic for xsk xmit by xsk framework or
> user.
>
> Virtio-net does not support to actively generate an interruption, so it
> tries to trigger tx NAPI on the local cpu.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Thanks
> ---
> drivers/net/virtio_net.c | 24 ++++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 7e811f392768..9bfccef18e27 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1368,6 +1368,29 @@ static bool virtnet_xsk_xmit(struct send_queue *sq, struct xsk_buff_pool *pool,
> return sent == budget;
> }
>
> +static int virtnet_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag)
> +{
> + struct virtnet_info *vi = netdev_priv(dev);
> + struct send_queue *sq;
> +
> + if (!netif_running(dev))
> + return -ENETDOWN;
> +
> + if (qid >= vi->curr_queue_pairs)
> + return -EINVAL;
> +
> + sq = &vi->sq[qid];
> +
> + if (napi_if_scheduled_mark_missed(&sq->napi))
> + return 0;
> +
> + local_bh_disable();
> + virtqueue_napi_schedule(&sq->napi, sq->vq);
> + local_bh_enable();
> +
> + return 0;
> +}
> +
> static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
> struct send_queue *sq,
> struct xdp_frame *xdpf)
> @@ -5706,6 +5729,7 @@ static const struct net_device_ops virtnet_netdev = {
> .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
> .ndo_bpf = virtnet_xdp,
> .ndo_xdp_xmit = virtnet_xdp_xmit,
> + .ndo_xsk_wakeup = virtnet_xsk_wakeup,
> .ndo_features_check = passthru_features_check,
> .ndo_get_phys_port_name = virtnet_get_phys_port_name,
> .ndo_set_features = virtnet_set_features,
> --
> 2.32.0.3.g01195cf9f
>
