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 = NULL;
45 int err;
46 int page_size = getpagesize();
47 int proto_fd = -1;
48
49 skel = test_ringbuf_multi__open();
50 if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
51 return;
52
53 /* validate ringbuf size adjustment logic */
54 ASSERT_EQ(bpf_map__max_entries(skel->maps.ringbuf1), page_size, "rb1_size_before");
55 ASSERT_OK(bpf_map__set_max_entries(skel->maps.ringbuf1, page_size + 1), "rb1_resize");
56 ASSERT_EQ(bpf_map__max_entries(skel->maps.ringbuf1), 2 * page_size, "rb1_size_after");
57 ASSERT_OK(bpf_map__set_max_entries(skel->maps.ringbuf1, page_size), "rb1_reset");
58 ASSERT_EQ(bpf_map__max_entries(skel->maps.ringbuf1), page_size, "rb1_size_final");
59
60 proto_fd = bpf_map_create(BPF_MAP_TYPE_RINGBUF, NULL, 0, 0, page_size, NULL);
61 if (CHECK(proto_fd < 0, "bpf_map_create", "bpf_map_create failed\n"))
62 goto cleanup;
63
64 err = bpf_map__set_inner_map_fd(skel->maps.ringbuf_hash, proto_fd);
65 if (CHECK(err != 0, "bpf_map__set_inner_map_fd", "bpf_map__set_inner_map_fd failed\n"))
66 goto cleanup;
67
68 err = test_ringbuf_multi__load(skel);
69 if (CHECK(err != 0, "skel_load", "skeleton load failed\n"))
70 goto cleanup;
71
72 close(proto_fd);
73 proto_fd = -1;
74
75 /* make sure we can't resize ringbuf after object load */
76 if (!ASSERT_ERR(bpf_map__set_max_entries(skel->maps.ringbuf1, 3 * page_size), "rb1_resize_after_load"))
77 goto cleanup;
78
79 /* only trigger BPF program for current process */
80 skel->bss->pid = getpid();
81
82 ringbuf = ring_buffer__new(bpf_map__fd(skel->maps.ringbuf1),
83 process_sample, (void *)(long)1, NULL);
84 if (CHECK(!ringbuf, "ringbuf_create", "failed to create ringbuf\n"))
85 goto cleanup;
86
87 err = ring_buffer__add(ringbuf, bpf_map__fd(skel->maps.ringbuf2),
88 process_sample, (void *)(long)2);
89 if (CHECK(err, "ringbuf_add", "failed to add another ring\n"))
90 goto cleanup;
91
92 err = test_ringbuf_multi__attach(skel);
93 if (CHECK(err, "skel_attach", "skeleton attachment failed: %d\n", err))
94 goto cleanup;
95
96 /* trigger few samples, some will be skipped */
97 skel->bss->target_ring = 0;
98 skel->bss->value = 333;
99 syscall(__NR_getpgid);
100
101 /* skipped, no ringbuf in slot 1 */
102 skel->bss->target_ring = 1;
103 skel->bss->value = 555;
104 syscall(__NR_getpgid);
105
106 skel->bss->target_ring = 2;
107 skel->bss->value = 777;
108 syscall(__NR_getpgid);
109
110 /* poll for samples, should get 2 ringbufs back */
111 err = ring_buffer__poll(ringbuf, -1);
112 if (CHECK(err != 2, "poll_res", "expected 2 records, got %d\n", err))
113 goto cleanup;
114
115 /* expect extra polling to return nothing */
116 err = ring_buffer__poll(ringbuf, 0);
117 if (CHECK(err < 0, "extra_samples", "poll result: %d\n", err))
118 goto cleanup;
119
120 CHECK(skel->bss->dropped != 0, "err_dropped", "exp %ld, got %ld\n",
121 0L, skel->bss->dropped);
122 CHECK(skel->bss->skipped != 1, "err_skipped", "exp %ld, got %ld\n",
123 1L, skel->bss->skipped);
124 CHECK(skel->bss->total != 2, "err_total", "exp %ld, got %ld\n",
125 2L, skel->bss->total);
126
127 cleanup:
128 if (proto_fd >= 0)
129 close(proto_fd);
130 ring_buffer__free(ringbuf);
131 test_ringbuf_multi__destroy(skel);
132 }
133