On Thu, Feb 02, 2023 at 07:00:41PM +0800, Xuan Zhuo wrote:
> At present, we have two long similar logic to perform XDP Progs. And in
> the implementation of XSK, we will have this need.
>
> Therefore, this PATCH separates the code of executing XDP, which is
> conducive to later maintenance and facilitates subsequent XSK for reuse.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
So you first add a new function then move users over.
This means that it's hard during review to make sure
nothing is lost in translation.
Do the refactoring in a single patch instead.
> ---
> drivers/net/virtio/main.c | 53 +++++++++++++++++++++++++++++++++
> drivers/net/virtio/virtio_net.h | 11 +++++++
> 2 files changed, 64 insertions(+)
>
> diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
> index 5683cb576474..9d4b84b23ef7 100644
> --- a/drivers/net/virtio/main.c
> +++ b/drivers/net/virtio/main.c
> @@ -478,6 +478,59 @@ static int virtnet_xdp_xmit(struct net_device *dev,
> return ret;
> }
>
> +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)
> +{
> + struct xdp_frame *xdpf;
> + int err;
> + u32 act;
> +
> + act = bpf_prog_run_xdp(xdp_prog, xdp);
> + stats->xdp_packets++;
> +
> + switch (act) {
> + case XDP_PASS:
> + return VIRTNET_XDP_RES_PASS;
> +
> + case XDP_TX:
> + stats->xdp_tx++;
> + xdpf = xdp_convert_buff_to_frame(xdp);
> + if (unlikely(!xdpf))
> + return VIRTNET_XDP_RES_DROP;
> +
> + 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(dev, xdp_prog, act);
> + return VIRTNET_XDP_RES_DROP;
> + }
> +
> + *xdp_xmit |= VIRTIO_XDP_TX;
> + return VIRTNET_XDP_RES_CONSUMED;
> +
> + case XDP_REDIRECT:
> + stats->xdp_redirects++;
> + err = xdp_do_redirect(dev, xdp, xdp_prog);
> + if (err)
> + return VIRTNET_XDP_RES_DROP;
> +
> + *xdp_xmit |= VIRTIO_XDP_REDIR;
> + return VIRTNET_XDP_RES_CONSUMED;
> +
> + default:
> + bpf_warn_invalid_xdp_action(dev, xdp_prog, act);
> + fallthrough;
> + case XDP_ABORTED:
> + trace_xdp_exception(dev, xdp_prog, act);
> + fallthrough;
> + case XDP_DROP:
> + return VIRTNET_XDP_RES_DROP;
> + }
> +}
> +
> static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
> {
> return vi->xdp_enabled ? VIRTIO_XDP_HEADROOM : 0;
> diff --git a/drivers/net/virtio/virtio_net.h b/drivers/net/virtio/virtio_net.h
> index 8bf31429ae28..af3e7e817f9e 100644
> --- a/drivers/net/virtio/virtio_net.h
> +++ b/drivers/net/virtio/virtio_net.h
> @@ -22,6 +22,12 @@
> #include <net/net_failover.h>
> #include <net/xdp_sock_drv.h>
>
> +enum {
> + VIRTNET_XDP_RES_PASS,
> + VIRTNET_XDP_RES_DROP,
> + VIRTNET_XDP_RES_CONSUMED,
> +};
> +
> #define VIRTIO_XDP_FLAG BIT(0)
>
> struct virtnet_info {
> @@ -262,4 +268,9 @@ static void __free_old_xmit(struct send_queue *sq, bool in_napi,
> stats->packets++;
> }
> }
> +
> +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);
> #endif
> --
> 2.32.0.3.g01195cf9f
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