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
process_sample(void * ctx,void * data,size_t len)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
test_ringbuf_multi(void)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 != 2, "poll_res", "expected 2 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