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https://git.kernel.org/pub/scm/network/iproute2/iproute2.git
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71c7c1fb4f
Users should try use the new BTF defined maps instead of struct bpf_elf_map defined maps. The tail call examples are not added yet as libbpf doesn't currently support declaratively populating tail call maps. Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Hangbin Liu <haliu@redhat.com> Signed-off-by: David Ahern <dsahern@gmail.com>
56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
#include "../../include/bpf_api.h"
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struct inner_map {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(key_size, sizeof(uint32_t));
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__uint(value_size, sizeof(uint32_t));
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__uint(max_entries, 1);
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} map_inner __section(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
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__uint(key_size, sizeof(uint32_t));
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__uint(value_size, sizeof(uint32_t));
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__uint(max_entries, 1);
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__uint(pinning, LIBBPF_PIN_BY_NAME);
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__array(values, struct inner_map);
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} map_outer __section(".maps") = {
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.values = {
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[0] = &map_inner,
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},
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};
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__section("egress")
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int emain(struct __sk_buff *skb)
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{
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struct bpf_elf_map *map_inner;
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int key = 0, *val;
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map_inner = map_lookup_elem(&map_outer, &key);
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if (map_inner) {
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val = map_lookup_elem(map_inner, &key);
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if (val)
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lock_xadd(val, 1);
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}
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return BPF_H_DEFAULT;
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}
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__section("ingress")
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int imain(struct __sk_buff *skb)
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{
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struct bpf_elf_map *map_inner;
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int key = 0, *val;
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map_inner = map_lookup_elem(&map_outer, &key);
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if (map_inner) {
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val = map_lookup_elem(map_inner, &key);
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if (val)
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printt("map val: %d\n", *val);
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}
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return BPF_H_DEFAULT;
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}
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BPF_LICENSE("GPL");
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