1#include <stdio.h>
2#include <sys/epoll.h>
3#include <util/util.h>
4#include <util/bpf-loader.h>
5#include <util/evlist.h>
6#include <linux/bpf.h>
7#include <linux/filter.h>
8#include <bpf/bpf.h>
9#include "tests.h"
10#include "llvm.h"
11#include "debug.h"
12#define NR_ITERS 111
13
14#ifdef HAVE_LIBBPF_SUPPORT
15
16static int epoll_wait_loop(void)
17{
18 int i;
19
20
21 for (i = 0; i < NR_ITERS; i++)
22 epoll_wait(-(i + 1), NULL, 0, 0);
23 return 0;
24}
25
26#ifdef HAVE_BPF_PROLOGUE
27
28static int llseek_loop(void)
29{
30 int fds[2], i;
31
32 fds[0] = open("/dev/null", O_RDONLY);
33 fds[1] = open("/dev/null", O_RDWR);
34
35 if (fds[0] < 0 || fds[1] < 0)
36 return -1;
37
38 for (i = 0; i < NR_ITERS; i++) {
39 lseek(fds[i % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
40 lseek(fds[(i + 1) % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
41 }
42 close(fds[0]);
43 close(fds[1]);
44 return 0;
45}
46
47#endif
48
49static struct {
50 enum test_llvm__testcase prog_id;
51 const char *desc;
52 const char *name;
53 const char *msg_compile_fail;
54 const char *msg_load_fail;
55 int (*target_func)(void);
56 int expect_result;
57} bpf_testcase_table[] = {
58 {
59 LLVM_TESTCASE_BASE,
60 "Test basic BPF filtering",
61 "[basic_bpf_test]",
62 "fix 'perf test LLVM' first",
63 "load bpf object failed",
64 &epoll_wait_loop,
65 (NR_ITERS + 1) / 2,
66 },
67#ifdef HAVE_BPF_PROLOGUE
68 {
69 LLVM_TESTCASE_BPF_PROLOGUE,
70 "Test BPF prologue generation",
71 "[bpf_prologue_test]",
72 "fix kbuild first",
73 "check your vmlinux setting?",
74 &llseek_loop,
75 (NR_ITERS + 1) / 4,
76 },
77#endif
78 {
79 LLVM_TESTCASE_BPF_RELOCATION,
80 "Test BPF relocation checker",
81 "[bpf_relocation_test]",
82 "fix 'perf test LLVM' first",
83 "libbpf error when dealing with relocation",
84 NULL,
85 0,
86 },
87};
88
89static int do_test(struct bpf_object *obj, int (*func)(void),
90 int expect)
91{
92 struct record_opts opts = {
93 .target = {
94 .uid = UINT_MAX,
95 .uses_mmap = true,
96 },
97 .freq = 0,
98 .mmap_pages = 256,
99 .default_interval = 1,
100 };
101
102 char pid[16];
103 char sbuf[STRERR_BUFSIZE];
104 struct perf_evlist *evlist;
105 int i, ret = TEST_FAIL, err = 0, count = 0;
106
107 struct parse_events_evlist parse_evlist;
108 struct parse_events_error parse_error;
109
110 bzero(&parse_error, sizeof(parse_error));
111 bzero(&parse_evlist, sizeof(parse_evlist));
112 parse_evlist.error = &parse_error;
113 INIT_LIST_HEAD(&parse_evlist.list);
114
115 err = parse_events_load_bpf_obj(&parse_evlist, &parse_evlist.list, obj, NULL);
116 if (err || list_empty(&parse_evlist.list)) {
117 pr_debug("Failed to add events selected by BPF\n");
118 return TEST_FAIL;
119 }
120
121 snprintf(pid, sizeof(pid), "%d", getpid());
122 pid[sizeof(pid) - 1] = '\0';
123 opts.target.tid = opts.target.pid = pid;
124
125
126 evlist = perf_evlist__new();
127 if (!evlist) {
128 pr_debug("No enough memory to create evlist\n");
129 return TEST_FAIL;
130 }
131
132 err = perf_evlist__create_maps(evlist, &opts.target);
133 if (err < 0) {
134 pr_debug("Not enough memory to create thread/cpu maps\n");
135 goto out_delete_evlist;
136 }
137
138 perf_evlist__splice_list_tail(evlist, &parse_evlist.list);
139 evlist->nr_groups = parse_evlist.nr_groups;
140
141 perf_evlist__config(evlist, &opts, NULL);
142
143 err = perf_evlist__open(evlist);
144 if (err < 0) {
145 pr_debug("perf_evlist__open: %s\n",
146 str_error_r(errno, sbuf, sizeof(sbuf)));
147 goto out_delete_evlist;
148 }
149
150 err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
151 if (err < 0) {
152 pr_debug("perf_evlist__mmap: %s\n",
153 str_error_r(errno, sbuf, sizeof(sbuf)));
154 goto out_delete_evlist;
155 }
156
157 perf_evlist__enable(evlist);
158 (*func)();
159 perf_evlist__disable(evlist);
160
161 for (i = 0; i < evlist->nr_mmaps; i++) {
162 union perf_event *event;
163
164 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
165 const u32 type = event->header.type;
166
167 if (type == PERF_RECORD_SAMPLE)
168 count ++;
169 }
170 }
171
172 if (count != expect) {
173 pr_debug("BPF filter result incorrect\n");
174 goto out_delete_evlist;
175 }
176
177 ret = TEST_OK;
178
179out_delete_evlist:
180 perf_evlist__delete(evlist);
181 return ret;
182}
183
184static struct bpf_object *
185prepare_bpf(void *obj_buf, size_t obj_buf_sz, const char *name)
186{
187 struct bpf_object *obj;
188
189 obj = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, name);
190 if (IS_ERR(obj)) {
191 pr_debug("Compile BPF program failed.\n");
192 return NULL;
193 }
194 return obj;
195}
196
197static int __test__bpf(int idx)
198{
199 int ret;
200 void *obj_buf;
201 size_t obj_buf_sz;
202 struct bpf_object *obj;
203
204 ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
205 bpf_testcase_table[idx].prog_id,
206 true, NULL);
207 if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
208 pr_debug("Unable to get BPF object, %s\n",
209 bpf_testcase_table[idx].msg_compile_fail);
210 if (idx == 0)
211 return TEST_SKIP;
212 else
213 return TEST_FAIL;
214 }
215
216 obj = prepare_bpf(obj_buf, obj_buf_sz,
217 bpf_testcase_table[idx].name);
218 if ((!!bpf_testcase_table[idx].target_func) != (!!obj)) {
219 if (!obj)
220 pr_debug("Fail to load BPF object: %s\n",
221 bpf_testcase_table[idx].msg_load_fail);
222 else
223 pr_debug("Success unexpectedly: %s\n",
224 bpf_testcase_table[idx].msg_load_fail);
225 ret = TEST_FAIL;
226 goto out;
227 }
228
229 if (obj)
230 ret = do_test(obj,
231 bpf_testcase_table[idx].target_func,
232 bpf_testcase_table[idx].expect_result);
233out:
234 bpf__clear();
235 return ret;
236}
237
238int test__bpf_subtest_get_nr(void)
239{
240 return (int)ARRAY_SIZE(bpf_testcase_table);
241}
242
243const char *test__bpf_subtest_get_desc(int i)
244{
245 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
246 return NULL;
247 return bpf_testcase_table[i].desc;
248}
249
250static int check_env(void)
251{
252 int err;
253 unsigned int kver_int;
254 char license[] = "GPL";
255
256 struct bpf_insn insns[] = {
257 BPF_MOV64_IMM(BPF_REG_0, 1),
258 BPF_EXIT_INSN(),
259 };
260
261 err = fetch_kernel_version(&kver_int, NULL, 0);
262 if (err) {
263 pr_debug("Unable to get kernel version\n");
264 return err;
265 }
266
267 err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
268 sizeof(insns) / sizeof(insns[0]),
269 license, kver_int, NULL, 0);
270 if (err < 0) {
271 pr_err("Missing basic BPF support, skip this test: %s\n",
272 strerror(errno));
273 return err;
274 }
275 close(err);
276
277 return 0;
278}
279
280int test__bpf(int i)
281{
282 int err;
283
284 if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
285 return TEST_FAIL;
286
287 if (geteuid() != 0) {
288 pr_debug("Only root can run BPF test\n");
289 return TEST_SKIP;
290 }
291
292 if (check_env())
293 return TEST_SKIP;
294
295 err = __test__bpf(i);
296 return err;
297}
298
299#else
300int test__bpf_subtest_get_nr(void)
301{
302 return 0;
303}
304
305const char *test__bpf_subtest_get_desc(int i __maybe_unused)
306{
307 return NULL;
308}
309
310int test__bpf(int i __maybe_unused)
311{
312 pr_debug("Skip BPF test because BPF support is not compiled\n");
313 return TEST_SKIP;
314}
315#endif
316
