From 0bed61371f7d537ecb6e1833acf59a74ae183b37 Mon Sep 17 00:00:00 2001 From: Eric Leblond Date: Fri, 21 Jun 2019 22:13:10 +0200 Subject: xsk: sample kernel code is now in libbpf Fix documentation that mention xdpsock_kern.c which has been replaced by code embedded in libbpf. Signed-off-by: Eric Leblond Acked-by: Björn Töpel Signed-off-by: Daniel Borkmann Signed-off-by: Alexei Starovoitov --- Documentation/networking/af_xdp.rst | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'Documentation/networking') diff --git a/Documentation/networking/af_xdp.rst b/Documentation/networking/af_xdp.rst index 50bccbf68308..eeedc2e826aa 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:: -- cgit v1.2.3-55-g7522