On Thu, Feb 02, 2023 at 07:00:44PM +0800, Xuan Zhuo wrote:
> Introduce virtnet_tx_reset() to release the buffers inside virtio ring.
>
> This is needed for xsk disable. When disable xsk, we need to relese the
typo
> buffer from xsk, so this function is needed.
>
> This patch reuse the virtnet_tx_resize.
reuses
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
> ---
> drivers/net/virtio/main.c | 21 ++++++++++++++++++---
> drivers/net/virtio/virtio_net.h | 1 +
> 2 files changed, 19 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
> index fb82035a0b7f..049a3bb9d88d 100644
> --- a/drivers/net/virtio/main.c
> +++ b/drivers/net/virtio/main.c
> @@ -1806,8 +1806,8 @@ static int virtnet_rx_resize(struct virtnet_info *vi,
> return err;
> }
>
> -static int virtnet_tx_resize(struct virtnet_info *vi,
> - struct send_queue *sq, u32 ring_num)
> +static int __virtnet_tx_reset(struct virtnet_info *vi,
> + struct send_queue *sq, u32 ring_num)
> {
> bool running = netif_running(vi->dev);
> struct netdev_queue *txq;
> @@ -1833,7 +1833,11 @@ static int virtnet_tx_resize(struct virtnet_info *vi,
>
> __netif_tx_unlock_bh(txq);
>
> - err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf);
> + if (ring_num)
> + err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf);
> + else
> + err = virtqueue_reset(sq->vq, virtnet_sq_free_unused_buf);
> +
> if (err)
> netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err);
>
This __virtnet_tx_reset is a really weird API.
Suggest just splitting the common parts:
__virtnet_tx_pause
__virtnet_tx_resume
we can then implement virtnet_tx_resize and virtnet_tx_reset
using these two.
> @@ -1847,6 +1851,17 @@ static int virtnet_tx_resize(struct virtnet_info *vi,
> return err;
> }
>
> +static int virtnet_tx_resize(struct virtnet_info *vi,
> + struct send_queue *sq, u32 ring_num)
> +{
> + return __virtnet_tx_reset(vi, sq, ring_num);
> +}
> +
> +int virtnet_tx_reset(struct virtnet_info *vi, struct send_queue *sq)
> +{
> + return __virtnet_tx_reset(vi, sq, 0);
> +}
> +
> /*
> * Send command via the control virtqueue and check status. Commands
> * supported by the hypervisor, as indicated by feature bits, should
> diff --git a/drivers/net/virtio/virtio_net.h b/drivers/net/virtio/virtio_net.h
> index af3e7e817f9e..b46f083a630a 100644
> --- a/drivers/net/virtio/virtio_net.h
> +++ b/drivers/net/virtio/virtio_net.h
> @@ -273,4 +273,5 @@ int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
> struct net_device *dev,
> unsigned int *xdp_xmit,
> struct virtnet_rq_stats *stats);
> +int virtnet_tx_reset(struct virtnet_info *vi, struct send_queue *sq);
> #endif
> --
> 2.32.0.3.g01195cf9f
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