1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
5 #include <bpf/bpf_helpers.h>
8 char _license[] SEC("license") = "GPL";
18 __uint(type, BPF_MAP_TYPE_RINGBUF);
19 } ringbuf SEC(".maps");
22 __uint(type, BPF_MAP_TYPE_HASH);
23 __uint(max_entries, 1000);
24 __type(key, struct sample);
26 } hash_map SEC(".maps");
34 SEC("fentry/" SYS_PREFIX "sys_getpgid")
35 int test_ringbuf_mem_map_key(void *ctx)
37 int cur_pid = bpf_get_current_pid_tgid() >> 32;
38 struct sample *sample, sample_copy;
44 sample = bpf_ringbuf_reserve(&ringbuf, sizeof(*sample), 0);
49 bpf_get_current_comm(sample->comm, sizeof(sample->comm));
53 /* test using 'sample' (PTR_TO_MEM | MEM_ALLOC) as map key arg
55 lookup_val = (int *)bpf_map_lookup_elem(&hash_map, sample);
58 /* workaround - memcpy is necessary so that verifier doesn't
60 * verifier internal error: more than one arg with ref_obj_id R3
61 * when trying to do bpf_map_update_elem(&hash_map, sample, &sample->seq, BPF_ANY);
63 * Since bpf_map_lookup_elem above uses 'sample' as key, test using
64 * sample field as value below
66 __builtin_memcpy(&sample_copy, sample, sizeof(struct sample));
67 bpf_map_update_elem(&hash_map, &sample_copy, &sample->seq, BPF_ANY);
69 bpf_ringbuf_submit(sample, 0);