On Tue, Mar 28, 2023 at 8:04 PM Xuan Zhuo <xuanz...@linux.alibaba.com> wrote:
>
> This patch introduce a new function that releases the
> xdp shinfo. The subsequent patch will reuse this function.
>
> Signed-off-by: Xuan Zhuo <xuanz...@linux.alibaba.com>
Acked-by: Jason Wang <jasow...@redhat.com>
Thanks
> ---
> drivers/net/virtio_net.c | 27 ++++++++++++++++-----------
> 1 file changed, 16 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 72b9d6ee4024..09aed60e2f51 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -798,6 +798,21 @@ static int virtnet_xdp_xmit(struct net_device *dev,
> return ret;
> }
>
> +static void put_xdp_frags(struct xdp_buff *xdp)
> +{
> + struct skb_shared_info *shinfo;
> + struct page *xdp_page;
> + int i;
> +
> + 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);
> + }
> + }
> +}
> +
> static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff
> *xdp,
> struct net_device *dev,
> unsigned int *xdp_xmit,
> @@ -1312,12 +1327,9 @@ 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 page *xdp_page;
> struct xdp_buff xdp;
> void *data;
> u32 act;
> - int i;
>
> data = mergeable_xdp_prepare(vi, rq, xdp_prog, ctx,
> &frame_sz, &num_buf, &page,
> offset, &len, hdr);
> @@ -1348,14 +1360,7 @@ static struct sk_buff *receive_mergeable(struct
> net_device *dev,
> goto err_xdp_frags;
> }
> err_xdp_frags:
> - 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);
> - }
> - }
> -
> + put_xdp_frags(&xdp);
> goto err_xdp;
> }
> rcu_read_unlock();
> --
> 2.32.0.3.g01195cf9f
>
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