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AF_XDP-interaction: Make BPF-prog BTF aware

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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
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11
AF_XDP-interaction/af_xdp_kern.c
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@@ -4,6 +4,8 @@
#include <bpf/bpf_helpers.h> #include <bpf/bpf_helpers.h>
#include <bpf/bpf_core_read.h> /* */
struct { struct {
__uint(type, BPF_MAP_TYPE_XSKMAP); __uint(type, BPF_MAP_TYPE_XSKMAP);
__uint(max_entries, 64); /* Assume netdev has no more than 64 queues */ __uint(max_entries, 64); /* Assume netdev has no more than 64 queues */
@@ -27,7 +29,14 @@ struct {
*/ */
struct meta_info { struct meta_info {
__u32 mark; __u32 mark;
__u32 btf_id;
} __attribute__((aligned(4))); } __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") SEC("xdp_sock")
int xdp_sock_prog(struct xdp_md *ctx) int xdp_sock_prog(struct xdp_md *ctx)
@@ -58,10 +67,10 @@ int xdp_sock_prog(struct xdp_md *ctx)
return XDP_ABORTED; return XDP_ABORTED;
meta->mark = 42; 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); pkt_count = bpf_map_lookup_elem(&xdp_stats_map, &index);
if (pkt_count) { if (pkt_count) {
/* We pass every other packet */ /* We pass every other packet */
if ((*pkt_count)++ & 1) if ((*pkt_count)++ & 1)
return XDP_PASS; return XDP_PASS;

3
AF_XDP-interaction/af_xdp_user.c
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@@ -303,6 +303,7 @@ static inline void csum_replace2(__sum16 *sum, __be16 old, __be16 new)
struct meta_info { struct meta_info {
__u32 mark; __u32 mark;
__u32 btf_id;
} __attribute__((aligned(4))); } __attribute__((aligned(4)));
static void print_meta_info(uint8_t *pkt, uint32_t len) static void print_meta_info(uint8_t *pkt, uint32_t len)
@@ -314,7 +315,7 @@ static void print_meta_info(uint8_t *pkt, uint32_t len)
*/ */
struct meta_info *meta = (void *)(pkt - sizeof(*meta)); struct meta_info *meta = (void *)(pkt - sizeof(*meta));
printf("DEBUG-meta %d\n", meta->mark); printf("DEBUG-meta btf_id:%d mark:%d\n", meta->btf_id, meta->mark);
} }