On Tue, Sep 24, 2024 at 9:32 AM Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> wrote:
>
> This patch implement the logic of bind/unbind xsk pool to sq and rq.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
> ---
> drivers/net/virtio_net.c | 53 ++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 53 insertions(+)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 41a5ea9b788d..7c379614fd22 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -295,6 +295,10 @@ struct send_queue {
>
> /* Record whether sq is in reset state. */
> bool reset;
> +
> + struct xsk_buff_pool *xsk_pool;
> +
> + dma_addr_t xsk_hdr_dma_addr;
> };
>
> /* Internal representation of a receive virtqueue */
> @@ -497,6 +501,8 @@ struct virtio_net_common_hdr {
> };
> };
>
> +static struct virtio_net_common_hdr xsk_hdr;
> +
> static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf);
> static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
> struct net_device *dev,
> @@ -5488,6 +5494,29 @@ static int virtnet_rq_bind_xsk_pool(struct virtnet_info *vi, struct receive_queu
> return err;
> }
>
> +static int virtnet_sq_bind_xsk_pool(struct virtnet_info *vi,
> + struct send_queue *sq,
> + struct xsk_buff_pool *pool)
> +{
> + int err, qindex;
> +
> + qindex = sq - vi->sq;
> +
> + virtnet_tx_pause(vi, sq);
> +
> + err = virtqueue_reset(sq->vq, virtnet_sq_free_unused_buf);
> + if (err) {
> + netdev_err(vi->dev, "reset tx fail: tx queue index: %d err: %d\n", qindex, err);
> + pool = NULL;
> + }
> +
> + sq->xsk_pool = pool;
> +
> + virtnet_tx_resume(vi, sq);
> +
> + return err;
> +}
> +
> static int virtnet_xsk_pool_enable(struct net_device *dev,
> struct xsk_buff_pool *pool,
> u16 qid)
> @@ -5496,6 +5525,7 @@ static int virtnet_xsk_pool_enable(struct net_device *dev,
> struct receive_queue *rq;
> struct device *dma_dev;
> struct send_queue *sq;
> + dma_addr_t hdr_dma;
> int err, size;
>
> if (vi->hdr_len > xsk_pool_get_headroom(pool))
> @@ -5533,6 +5563,11 @@ static int virtnet_xsk_pool_enable(struct net_device *dev,
> if (!rq->xsk_buffs)
> return -ENOMEM;
>
> + hdr_dma = virtqueue_dma_map_single_attrs(sq->vq, &xsk_hdr, vi->hdr_len,
> + DMA_TO_DEVICE, 0);
> + if (virtqueue_dma_mapping_error(sq->vq, hdr_dma))
> + return -ENOMEM;
> +
> err = xsk_pool_dma_map(pool, dma_dev, 0);
> if (err)
> goto err_xsk_map;
> @@ -5541,11 +5576,24 @@ static int virtnet_xsk_pool_enable(struct net_device *dev,
> if (err)
> goto err_rq;
>
> + err = virtnet_sq_bind_xsk_pool(vi, sq, pool);
> + if (err)
> + goto err_sq;
> +
> + /* Now, we do not support tx offset, so all the tx virtnet hdr is zero.
What did you mean by "tx offset" here? (Or I don't see the connection
with vnet hdr).
Anyhow the patch looks good.
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Thanks
