netdev - Re: [PATCH] xsk: sample kernel code is now in libbpf

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Date:   Mon, 24 Jun 2019 12:01:54 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Eric Leblond <eric@...it.org>
Cc:     Netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>
Subject: Re: [PATCH] xsk: sample kernel code is now in libbpf

On Fri, 21 Jun 2019 at 22:55, Eric Leblond <eric@...it.org> wrote:
>
> Fix documentation that mention xdpsock_kern.c which has been
> replaced by code embedded in libbpf.
>
> Signed-off-by: Eric Leblond <eric@...it.org>

Thanks Eric!

Acked-by: Björn Töpel <bjorn.topel@...el.com>

> ---
>  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
>