1 // SPDX-License-Identifier: GPL-2.0 2 #define _GNU_SOURCE 3 #include <test_progs.h> 4 #include <sys/epoll.h> 5 #include "test_ringbuf_multi.skel.h" 6 7 static int duration = 0; 8 9 struct sample { 10 int pid; 11 int seq; 12 long value; 13 char comm[16]; 14 }; 15 16 static int process_sample(void *ctx, void *data, size_t len) 17 { 18 int ring = (unsigned long)ctx; 19 struct sample *s = data; 20 21 switch (s->seq) { 22 case 0: 23 CHECK(ring != 1, "sample1_ring", "exp %d, got %d\n", 1, ring); 24 CHECK(s->value != 333, "sample1_value", "exp %ld, got %ld\n", 25 333L, s->value); 26 break; 27 case 1: 28 CHECK(ring != 2, "sample2_ring", "exp %d, got %d\n", 2, ring); 29 CHECK(s->value != 777, "sample2_value", "exp %ld, got %ld\n", 30 777L, s->value); 31 break; 32 default: 33 CHECK(true, "extra_sample", "unexpected sample seq %d, val %ld\n", 34 s->seq, s->value); 35 return -1; 36 } 37 38 return 0; 39 } 40 41 void test_ringbuf_multi(void) 42 { 43 struct test_ringbuf_multi *skel; 44 struct ring_buffer *ringbuf; 45 int err; 46 47 skel = test_ringbuf_multi__open_and_load(); 48 if (CHECK(!skel, "skel_open_load", "skeleton open&load failed\n")) 49 return; 50 51 /* only trigger BPF program for current process */ 52 skel->bss->pid = getpid(); 53 54 ringbuf = ring_buffer__new(bpf_map__fd(skel->maps.ringbuf1), 55 process_sample, (void *)(long)1, NULL); 56 if (CHECK(!ringbuf, "ringbuf_create", "failed to create ringbuf\n")) 57 goto cleanup; 58 59 err = ring_buffer__add(ringbuf, bpf_map__fd(skel->maps.ringbuf2), 60 process_sample, (void *)(long)2); 61 if (CHECK(err, "ringbuf_add", "failed to add another ring\n")) 62 goto cleanup; 63 64 err = test_ringbuf_multi__attach(skel); 65 if (CHECK(err, "skel_attach", "skeleton attachment failed: %d\n", err)) 66 goto cleanup; 67 68 /* trigger few samples, some will be skipped */ 69 skel->bss->target_ring = 0; 70 skel->bss->value = 333; 71 syscall(__NR_getpgid); 72 73 /* skipped, no ringbuf in slot 1 */ 74 skel->bss->target_ring = 1; 75 skel->bss->value = 555; 76 syscall(__NR_getpgid); 77 78 skel->bss->target_ring = 2; 79 skel->bss->value = 777; 80 syscall(__NR_getpgid); 81 82 /* poll for samples, should get 2 ringbufs back */ 83 err = ring_buffer__poll(ringbuf, -1); 84 if (CHECK(err != 4, "poll_res", "expected 4 records, got %d\n", err)) 85 goto cleanup; 86 87 /* expect extra polling to return nothing */ 88 err = ring_buffer__poll(ringbuf, 0); 89 if (CHECK(err < 0, "extra_samples", "poll result: %d\n", err)) 90 goto cleanup; 91 92 CHECK(skel->bss->dropped != 0, "err_dropped", "exp %ld, got %ld\n", 93 0L, skel->bss->dropped); 94 CHECK(skel->bss->skipped != 1, "err_skipped", "exp %ld, got %ld\n", 95 1L, skel->bss->skipped); 96 CHECK(skel->bss->total != 2, "err_total", "exp %ld, got %ld\n", 97 2L, skel->bss->total); 98 99 cleanup: 100 ring_buffer__free(ringbuf); 101 test_ringbuf_multi__destroy(skel); 102 } 103