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107 lines
2.3 KiB
107 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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#include <stdio.h> |
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#include <fcntl.h> |
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#include <poll.h> |
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#include <time.h> |
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#include <signal.h> |
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#include <bpf/libbpf.h> |
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static __u64 time_get_ns(void) |
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{ |
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struct timespec ts; |
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clock_gettime(CLOCK_MONOTONIC, &ts); |
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return ts.tv_sec * 1000000000ull + ts.tv_nsec; |
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} |
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static __u64 start_time; |
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static __u64 cnt; |
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#define MAX_CNT 100000ll |
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static void print_bpf_output(void *ctx, int cpu, void *data, __u32 size) |
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{ |
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struct { |
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__u64 pid; |
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__u64 cookie; |
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} *e = data; |
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if (e->cookie != 0x12345678) { |
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printf("BUG pid %llx cookie %llx sized %d\n", |
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e->pid, e->cookie, size); |
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return; |
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} |
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cnt++; |
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if (cnt == MAX_CNT) { |
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printf("recv %lld events per sec\n", |
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MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); |
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return; |
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} |
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} |
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int main(int argc, char **argv) |
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{ |
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struct perf_buffer_opts pb_opts = {}; |
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struct bpf_link *link = NULL; |
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struct bpf_program *prog; |
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struct perf_buffer *pb; |
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struct bpf_object *obj; |
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int map_fd, ret = 0; |
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char filename[256]; |
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FILE *f; |
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); |
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obj = bpf_object__open_file(filename, NULL); |
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if (libbpf_get_error(obj)) { |
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fprintf(stderr, "ERROR: opening BPF object file failed\n"); |
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return 0; |
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} |
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/* load BPF program */ |
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if (bpf_object__load(obj)) { |
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fprintf(stderr, "ERROR: loading BPF object file failed\n"); |
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goto cleanup; |
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} |
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map_fd = bpf_object__find_map_fd_by_name(obj, "my_map"); |
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if (map_fd < 0) { |
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fprintf(stderr, "ERROR: finding a map in obj file failed\n"); |
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goto cleanup; |
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} |
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prog = bpf_object__find_program_by_name(obj, "bpf_prog1"); |
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if (libbpf_get_error(prog)) { |
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fprintf(stderr, "ERROR: finding a prog in obj file failed\n"); |
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goto cleanup; |
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} |
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link = bpf_program__attach(prog); |
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if (libbpf_get_error(link)) { |
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fprintf(stderr, "ERROR: bpf_program__attach failed\n"); |
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link = NULL; |
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goto cleanup; |
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} |
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pb_opts.sample_cb = print_bpf_output; |
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pb = perf_buffer__new(map_fd, 8, &pb_opts); |
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ret = libbpf_get_error(pb); |
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if (ret) { |
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printf("failed to setup perf_buffer: %d\n", ret); |
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return 1; |
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} |
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f = popen("taskset 1 dd if=/dev/zero of=/dev/null", "r"); |
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(void) f; |
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start_time = time_get_ns(); |
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while ((ret = perf_buffer__poll(pb, 1000)) >= 0 && cnt < MAX_CNT) { |
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} |
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kill(0, SIGINT); |
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cleanup: |
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bpf_link__destroy(link); |
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bpf_object__close(obj); |
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return ret; |
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}
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