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