On Thu, Feb 02, 2023 at 07:00:43PM +0800, Xuan Zhuo wrote:
> receive_merageable() use virtnet_xdp_handler()
>
> Meanwhile, support Multi Buffer XDP.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
typo
> ---
> drivers/net/virtio/main.c | 88 +++++++++++++++------------------------
> 1 file changed, 33 insertions(+), 55 deletions(-)
>
> diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
> index d7a856bd8862..fb82035a0b7f 100644
> --- a/drivers/net/virtio/main.c
> +++ b/drivers/net/virtio/main.c
> @@ -483,8 +483,10 @@ int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
> unsigned int *xdp_xmit,
> struct virtnet_rq_stats *stats)
> {
> + struct skb_shared_info *shinfo;
> struct xdp_frame *xdpf;
> - int err;
> + struct page *xdp_page;
> + int err, i;
> u32 act;
>
> act = bpf_prog_run_xdp(xdp_prog, xdp);
> @@ -527,6 +529,13 @@ int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
> trace_xdp_exception(dev, xdp_prog, act);
> fallthrough;
> case XDP_DROP:
> + if (xdp_buff_has_frags(xdp)) {
> + shinfo = xdp_get_shared_info_from_buff(xdp);
> + for (i = 0; i < shinfo->nr_frags; i++) {
> + xdp_page = skb_frag_page(&shinfo->frags[i]);
> + put_page(xdp_page);
> + }
> + }
> return VIRTNET_XDP_RES_DROP;
> }
> }
> @@ -809,7 +818,7 @@ static int virtnet_build_xdp_buff_mrg(struct net_device *dev,
> unsigned int xdp_frags_truesz = 0;
> struct page *page;
> skb_frag_t *frag;
> - int offset;
> + int offset, i;
> void *ctx;
>
> xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq);
> @@ -842,7 +851,7 @@ 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;
> @@ -861,7 +870,7 @@ 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++];
> @@ -876,6 +885,14 @@ static int virtnet_build_xdp_buff_mrg(struct net_device *dev,
>
> *xdp_frags_truesize = xdp_frags_truesz;
> return 0;
> +
> +err:
> + for (i = 0; i < shinfo->nr_frags; i++) {
> + page = skb_frag_page(&shinfo->frags[i]);
> + put_page(page);
> + }
> +
> + return -EINVAL;
> }
>
> static struct sk_buff *receive_mergeable(struct net_device *dev,
> @@ -919,13 +936,10 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
> xdp_prog = rcu_dereference(rq->xdp_prog);
> if (xdp_prog) {
> unsigned int xdp_frags_truesz = 0;
> - struct skb_shared_info *shinfo;
> - struct xdp_frame *xdpf;
> struct page *xdp_page;
> struct xdp_buff xdp;
> void *data;
> u32 act;
> - int i;
>
> /* Transient failure which in theory could occur if
> * in-flight packets from before XDP was enabled reach
> @@ -983,69 +997,33 @@ 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 = bpf_prog_run_xdp(xdp_prog, &xdp);
> - stats->xdp_packets++;
> + act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
>
> switch (act) {
> - case XDP_PASS:
> + case VIRTNET_XDP_RES_PASS:
> if (unlikely(xdp_page != page))
> put_page(page);
> +
> head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz);
> rcu_read_unlock();
> return head_skb;
> - case XDP_TX:
> - stats->xdp_tx++;
> - xdpf = xdp_convert_buff_to_frame(&xdp);
> - if (unlikely(!xdpf)) {
> - netdev_dbg(dev, "convert buff to frame failed for xdp\n");
> - goto err_xdp_frags;
> - }
> - err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
> - if (unlikely(!err)) {
> - xdp_return_frame_rx_napi(xdpf);
> - } else if (unlikely(err < 0)) {
> - trace_xdp_exception(vi->dev, xdp_prog, act);
> - goto err_xdp_frags;
> - }
> - *xdp_xmit |= VIRTIO_XDP_TX;
> - if (unlikely(xdp_page != page))
> - put_page(page);
> - rcu_read_unlock();
> - goto xdp_xmit;
> - case XDP_REDIRECT:
> - stats->xdp_redirects++;
> - err = xdp_do_redirect(dev, &xdp, xdp_prog);
> - if (err)
> - goto err_xdp_frags;
> - *xdp_xmit |= VIRTIO_XDP_REDIR;
> +
> + case VIRTNET_XDP_RES_CONSUMED:
> if (unlikely(xdp_page != page))
> put_page(page);
> +
> rcu_read_unlock();
> goto xdp_xmit;
> - default:
> - bpf_warn_invalid_xdp_action(vi->dev, xdp_prog, act);
> - fallthrough;
> - case XDP_ABORTED:
> - trace_xdp_exception(vi->dev, xdp_prog, act);
> - fallthrough;
> - case XDP_DROP:
> - goto err_xdp_frags;
> - }
> -err_xdp_frags:
> - if (unlikely(xdp_page != page))
> - __free_pages(xdp_page, 0);
>
> - if (xdp_buff_has_frags(&xdp)) {
> - shinfo = xdp_get_shared_info_from_buff(&xdp);
> - for (i = 0; i < shinfo->nr_frags; i++) {
> - xdp_page = skb_frag_page(&shinfo->frags[i]);
> + case VIRTNET_XDP_RES_DROP:
> + if (unlikely(xdp_page != page))
> put_page(xdp_page);
> - }
> - }
>
> - goto err_xdp;
> + rcu_read_unlock();
> + goto err_xdp;
> + }
> }
> rcu_read_unlock();
>
> --
> 2.32.0.3.g01195cf9f
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