On Fri, 21 Jun 2019 at 22:55, Eric Leblond <eric@xxxxxxxxx> wrote:
>
> Fix documentation that mention xdpsock_kern.c which has been
> replaced by code embedded in libbpf.
>
> Signed-off-by: Eric Leblond <eric@xxxxxxxxx>
Thanks Eric!
Acked-by: Björn Töpel <bjorn.topel@xxxxxxxxx>
> ---
> Documentation/networking/af_xdp.rst | 16 +++++++++++++++-
> 1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/networking/af_xdp.rst b/Documentation/networking/af_xdp.rst
> index e14d7d40fc75..83dddc20f5d6 100644
> --- a/Documentation/networking/af_xdp.rst
> +++ b/Documentation/networking/af_xdp.rst
> @@ -220,7 +220,21 @@ Usage
> In order to use AF_XDP sockets there are two parts needed. The
> user-space application and the XDP program. For a complete setup and
> usage example, please refer to the sample application. The user-space
> -side is xdpsock_user.c and the XDP side xdpsock_kern.c.
> +side is xdpsock_user.c and the XDP side is part of libbpf.
> +
> +The XDP code sample included in tools/lib/bpf/xsk.c is the following::
> +
> + SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx)
> + {
> + int index = ctx->rx_queue_index;
> +
> + // A set entry here means that the correspnding queue_id
> + // has an active AF_XDP socket bound to it.
> + if (bpf_map_lookup_elem(&xsks_map, &index))
> + return bpf_redirect_map(&xsks_map, index, 0);
> +
> + return XDP_PASS;
> + }
>
> Naive ring dequeue and enqueue could look like this::
>
> --
> 2.20.1
>
