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author | Eric Leblond <eric@regit.org> | 2019-06-21 22:13:10 +0200 |
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committer | Alexei Starovoitov <ast@kernel.org> | 2019-06-24 18:18:30 -0700 |
commit | 0bed61371f7d537ecb6e1833acf59a74ae183b37 (patch) | |
tree | fec3937ab54550da57718c313d1686231dd91030 /Documentation | |
parent | 900de4ac4953fcf5e25ea45bea5bb28e797b1420 (diff) | |
download | linux-0bed61371f7d537ecb6e1833acf59a74ae183b37.tar.bz2 |
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Fix documentation that mention xdpsock_kern.c which has been
replaced by code embedded in libbpf.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 <eric@regit.org>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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:: |