1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <stdio.h> 3 #include <fcntl.h> 4 #include <poll.h> 5 #include <time.h> 6 #include <signal.h> 7 #include <bpf/libbpf.h> 8 9 static __u64 time_get_ns(void) 10 { 11 struct timespec ts; 12 13 clock_gettime(CLOCK_MONOTONIC, &ts); 14 return ts.tv_sec * 1000000000ull + ts.tv_nsec; 15 } 16 17 static __u64 start_time; 18 static __u64 cnt; 19 20 #define MAX_CNT 100000ll 21 22 static void print_bpf_output(void *ctx, int cpu, void *data, __u32 size) 23 { 24 struct { 25 __u64 pid; 26 __u64 cookie; 27 } *e = data; 28 29 if (e->cookie != 0x12345678) { 30 printf("BUG pid %llx cookie %llx sized %d\n", 31 e->pid, e->cookie, size); 32 return; 33 } 34 35 cnt++; 36 37 if (cnt == MAX_CNT) { 38 printf("recv %lld events per sec\n", 39 MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); 40 return; 41 } 42 } 43 44 int main(int argc, char **argv) 45 { 46 struct bpf_link *link = NULL; 47 struct bpf_program *prog; 48 struct perf_buffer *pb; 49 struct bpf_object *obj; 50 int map_fd, ret = 0; 51 char filename[256]; 52 FILE *f; 53 54 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 55 obj = bpf_object__open_file(filename, NULL); 56 if (libbpf_get_error(obj)) { 57 fprintf(stderr, "ERROR: opening BPF object file failed\n"); 58 return 0; 59 } 60 61 /* load BPF program */ 62 if (bpf_object__load(obj)) { 63 fprintf(stderr, "ERROR: loading BPF object file failed\n"); 64 goto cleanup; 65 } 66 67 map_fd = bpf_object__find_map_fd_by_name(obj, "my_map"); 68 if (map_fd < 0) { 69 fprintf(stderr, "ERROR: finding a map in obj file failed\n"); 70 goto cleanup; 71 } 72 73 prog = bpf_object__find_program_by_name(obj, "bpf_prog1"); 74 if (libbpf_get_error(prog)) { 75 fprintf(stderr, "ERROR: finding a prog in obj file failed\n"); 76 goto cleanup; 77 } 78 79 link = bpf_program__attach(prog); 80 if (libbpf_get_error(link)) { 81 fprintf(stderr, "ERROR: bpf_program__attach failed\n"); 82 link = NULL; 83 goto cleanup; 84 } 85 86 pb = perf_buffer__new(map_fd, 8, print_bpf_output, NULL, NULL, NULL); 87 ret = libbpf_get_error(pb); 88 if (ret) { 89 printf("failed to setup perf_buffer: %d\n", ret); 90 return 1; 91 } 92 93 f = popen("taskset 1 dd if=/dev/zero of=/dev/null", "r"); 94 (void) f; 95 96 start_time = time_get_ns(); 97 while ((ret = perf_buffer__poll(pb, 1000)) >= 0 && cnt < MAX_CNT) { 98 } 99 kill(0, SIGINT); 100 101 cleanup: 102 bpf_link__destroy(link); 103 bpf_object__close(obj); 104 return ret; 105 } 106