mirror/xdp-project-bpf-examples
1
0
Fork 0
mirror of https://github.com/xdp-project/bpf-examples.git synced 2024-05-06 15:54:53 +00:00
Code Issues Projects Releases Wiki Activity

AF_XDP-interaction: Make BPF-prog BTF aware

Browse Source 
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
This commit is contained in:
Jesper Dangaard Brouer
2021-10-29 17:54:09 +02:00
parent 858778aa83
commit 69c0f60008
2 changed files with 12 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
AF_XDP-interaction/af_xdp_kern.c
View File

@@ -4,6 +4,8 @@
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_core_read.h> /* */
struct {
__uint(type, BPF_MAP_TYPE_XSKMAP);
__uint(max_entries, 64); /* Assume netdev has no more than 64 queues */
@@ -27,7 +29,14 @@ struct {
*/
struct meta_info {
__u32 mark;
__u32 btf_id;
} __attribute__((aligned(4)));
/*
* NOTICE: Do NOT define __attribute__((preserve_access_index)) here,
* as libbpf will try to find a matching kernel data-structure,
* e.g. it will cause BPF-prog loading step to fail (with invalid func
* unknown#195896080 which is 0xbad2310 in hex for "bad relo").
*/
SEC("xdp_sock")
int xdp_sock_prog(struct xdp_md *ctx)
@@ -58,10 +67,10 @@ int xdp_sock_prog(struct xdp_md *ctx)
return XDP_ABORTED;
meta->mark = 42;
meta->btf_id = bpf_core_type_id_local(struct xdp_hints_mark);
pkt_count = bpf_map_lookup_elem(&xdp_stats_map, &index);
if (pkt_count) {
/* We pass every other packet */
if ((*pkt_count)++ & 1)
return XDP_PASS;