diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/map_in_map_btf.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/map_in_map_btf.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/map_in_map_btf.c b/tools/testing/selftests/bpf/progs/map_in_map_btf.c new file mode 100644 index 0000000000..7a1336d7b1 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/map_in_map_btf.c @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2023. Huawei Technologies Co., Ltd */ +#include <vmlinux.h> +#include <bpf/bpf_tracing.h> +#include <bpf/bpf_helpers.h> + +#include "bpf_misc.h" +#include "bpf_experimental.h" + +struct node_data { + __u64 data; + struct bpf_list_node node; +}; + +struct map_value { + struct bpf_list_head head __contains(node_data, node); + struct bpf_spin_lock lock; +}; + +struct inner_array_type { + __uint(type, BPF_MAP_TYPE_ARRAY); + __type(key, int); + __type(value, struct map_value); + __uint(max_entries, 1); +} inner_array SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS); + __uint(key_size, 4); + __uint(value_size, 4); + __uint(max_entries, 1); + __array(values, struct inner_array_type); +} outer_array SEC(".maps") = { + .values = { + [0] = &inner_array, + }, +}; + +char _license[] SEC("license") = "GPL"; + +int pid = 0; +bool done = false; + +SEC("fentry/" SYS_PREFIX "sys_nanosleep") +int add_to_list_in_inner_array(void *ctx) +{ + struct map_value *value; + struct node_data *new; + struct bpf_map *map; + int zero = 0; + + if (done || (u32)bpf_get_current_pid_tgid() != pid) + return 0; + + map = bpf_map_lookup_elem(&outer_array, &zero); + if (!map) + return 0; + + value = bpf_map_lookup_elem(map, &zero); + if (!value) + return 0; + + new = bpf_obj_new(typeof(*new)); + if (!new) + return 0; + + bpf_spin_lock(&value->lock); + bpf_list_push_back(&value->head, &new->node); + bpf_spin_unlock(&value->lock); + done = true; + + return 0; +} |