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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Fix documentation that mention xdpsock_kern.c which has been
replaced by code embedded in libbpf.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>
alistair/sunxi64-5.4-dsi
Eric Leblond 2019-06-21 22:13:10 +02:00 committed by Alexei Starovoitov
parent 900de4ac49
commit 0bed61371f
1 changed files with 15 additions and 1 deletions
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16
Documentation/networking/af_xdp.rst
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@ -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::