// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */ #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #include "bpf_misc.h" char _license[] SEC("license") = "GPL"; struct sample { int pid; int seq; long value; char comm[16]; }; struct { __uint(type, BPF_MAP_TYPE_RINGBUF); } ringbuf SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 1000); __type(key, struct sample); __type(value, int); } hash_map SEC(".maps"); /* inputs */ int pid = 0; /* inner state */ long seq = 0; SEC("fentry/" SYS_PREFIX "sys_getpgid") int test_ringbuf_mem_map_key(void *ctx) { int cur_pid = bpf_get_current_pid_tgid() >> 32; struct sample *sample; int *lookup_val; if (cur_pid != pid) return 0; sample = bpf_ringbuf_reserve(&ringbuf, sizeof(*sample), 0); if (!sample) return 0; sample->pid = pid; bpf_get_current_comm(sample->comm, sizeof(sample->comm)); sample->seq = ++seq; sample->value = 42; /* test using 'sample' (PTR_TO_MEM | MEM_ALLOC) as map key arg */ lookup_val = (int *)bpf_map_lookup_elem(&hash_map, sample); __sink(lookup_val); /* * Since bpf_map_lookup_elem above uses 'sample' as key, test using * sample field as value below */ bpf_map_update_elem(&hash_map, sample, &sample->seq, BPF_ANY); bpf_ringbuf_submit(sample, 0); return 0; }