Re: [PATCH net-next v3 07/15] virtio_net: auto release xdp shinfo

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On Sun, Apr 23, 2023 at 6:57 PM Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> wrote:
>
> virtnet_build_xdp_buff_mrg() and virtnet_xdp_handler() auto
> release xdp shinfo then the caller no need to careful the xdp shinfo.

Thinking of this, I think releasing frags in
virtnet_build_xdp_buff_mrg() is fine. But for virtnet_xdp_handler(),
it's better to be done by the caller, since the frags were prepared by
the caller anyhow.

Thanks

>
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
> ---
>  drivers/net/virtio_net.c | 29 +++++++++++++++++------------
>  1 file changed, 17 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 5f37a1cef61e..c6bf425e8844 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -825,7 +825,7 @@ static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
>                 xdpf = xdp_convert_buff_to_frame(xdp);
>                 if (unlikely(!xdpf)) {
>                         netdev_dbg(dev, "convert buff to frame failed for xdp\n");
> -                       return XDP_DROP;
> +                       goto drop;
>                 }
>
>                 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
> @@ -833,7 +833,7 @@ static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
>                         xdp_return_frame_rx_napi(xdpf);
>                 } else if (unlikely(err < 0)) {
>                         trace_xdp_exception(dev, xdp_prog, act);
> -                       return XDP_DROP;
> +                       goto drop;
>                 }
>                 *xdp_xmit |= VIRTIO_XDP_TX;
>                 return act;
> @@ -842,7 +842,7 @@ static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
>                 stats->xdp_redirects++;
>                 err = xdp_do_redirect(dev, xdp, xdp_prog);
>                 if (err)
> -                       return XDP_DROP;
> +                       goto drop;
>
>                 *xdp_xmit |= VIRTIO_XDP_REDIR;
>                 return act;
> @@ -854,8 +854,12 @@ static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
>                 trace_xdp_exception(dev, xdp_prog, act);
>                 fallthrough;
>         case XDP_DROP:
> -               return XDP_DROP;
> +               break;
>         }
> +
> +drop:
> +       put_xdp_frags(xdp);
> +       return XDP_DROP;
>  }
>
>  static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
> @@ -1190,7 +1194,7 @@ static int virtnet_build_xdp_buff_mrg(struct net_device *dev,
>                                  dev->name, *num_buf,
>                                  virtio16_to_cpu(vi->vdev, hdr->num_buffers));
>                         dev->stats.rx_length_errors++;
> -                       return -EINVAL;
> +                       goto err;
>                 }
>
>                 stats->bytes += len;
> @@ -1209,7 +1213,7 @@ static int virtnet_build_xdp_buff_mrg(struct net_device *dev,
>                         pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
>                                  dev->name, len, (unsigned long)(truesize - room));
>                         dev->stats.rx_length_errors++;
> -                       return -EINVAL;
> +                       goto err;
>                 }
>
>                 frag = &shinfo->frags[shinfo->nr_frags++];
> @@ -1224,6 +1228,10 @@ static int virtnet_build_xdp_buff_mrg(struct net_device *dev,
>
>         *xdp_frags_truesize = xdp_frags_truesz;
>         return 0;
> +
> +err:
> +       put_xdp_frags(xdp);
> +       return -EINVAL;
>  }
>
>  static void *mergeable_xdp_get_buf(struct virtnet_info *vi,
> @@ -1353,7 +1361,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
>                 err = virtnet_build_xdp_buff_mrg(dev, vi, rq, &xdp, data, len, frame_sz,
>                                                  &num_buf, &xdp_frags_truesz, stats);
>                 if (unlikely(err))
> -                       goto err_xdp_frags;
> +                       goto err_xdp;
>
>                 act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
>
> @@ -1361,7 +1369,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
>                 case XDP_PASS:
>                         head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz);
>                         if (unlikely(!head_skb))
> -                               goto err_xdp_frags;
> +                               goto err_xdp;
>
>                         rcu_read_unlock();
>                         return head_skb;
> @@ -1370,11 +1378,8 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
>                         rcu_read_unlock();
>                         goto xdp_xmit;
>                 default:
> -                       break;
> +                       goto err_xdp;
>                 }
> -err_xdp_frags:
> -               put_xdp_frags(&xdp);
> -               goto err_xdp;
>         }
>         rcu_read_unlock();
>
> --
> 2.32.0.3.g01195cf9f
>

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