diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/networking/af_xdp.rst | 16 |
1 files changed, 15 insertions, 1 deletions
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:: |