C++ (Cpp) bpf_prog_put_rcu Examples

Example #1

File: arraymap.c Project: ammubhave/bargud

/* only called from syscall */
static int prog_array_map_update_elem(struct bpf_map *map, void *key,
				      void *value, u64 map_flags)
{
	struct bpf_array *array = container_of(map, struct bpf_array, map);
	struct bpf_prog *prog, *old_prog;
	u32 index = *(u32 *)key, ufd;

	if (map_flags != BPF_ANY)
		return -EINVAL;

	if (index >= array->map.max_entries)
		return -E2BIG;

	ufd = *(u32 *)value;
	prog = bpf_prog_get(ufd);
	if (IS_ERR(prog))
		return PTR_ERR(prog);

	if (!bpf_prog_array_compatible(array, prog)) {
		bpf_prog_put(prog);
		return -EINVAL;
	}

	old_prog = xchg(array->prog + index, prog);
	if (old_prog)
		bpf_prog_put_rcu(old_prog);

	return 0;
}

Example #2

File: arraymap.c Project: ammubhave/bargud

static int prog_array_map_delete_elem(struct bpf_map *map, void *key)
{
	struct bpf_array *array = container_of(map, struct bpf_array, map);
	struct bpf_prog *old_prog;
	u32 index = *(u32 *)key;

	if (index >= array->map.max_entries)
		return -E2BIG;

	old_prog = xchg(array->prog + index, NULL);
	if (old_prog) {
		bpf_prog_put_rcu(old_prog);
		return 0;
	} else {
		return -ENOENT;
	}
}

Example #3

File: arraymap.c Project: coralreef2046/net-next-nuse

static void prog_fd_array_put_ptr(void *ptr)
{
    struct bpf_prog *prog = ptr;

    bpf_prog_put_rcu(prog);
}