Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 1 | #include <stdio.h> |
| 2 | #include <sys/epoll.h> |
Wang Nan | 6a7d550 | 2016-01-25 09:55:53 +0000 | [diff] [blame] | 3 | #include <util/util.h> |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 4 | #include <util/bpf-loader.h> |
| 5 | #include <util/evlist.h> |
Wang Nan | 6a7d550 | 2016-01-25 09:55:53 +0000 | [diff] [blame] | 6 | #include <linux/bpf.h> |
| 7 | #include <linux/filter.h> |
| 8 | #include <bpf/bpf.h> |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 9 | #include "tests.h" |
| 10 | #include "llvm.h" |
| 11 | #include "debug.h" |
| 12 | #define NR_ITERS 111 |
| 13 | |
| 14 | #ifdef HAVE_LIBBPF_SUPPORT |
| 15 | |
Arnaldo Carvalho de Melo | 4ffde49 | 2016-07-11 23:22:30 -0300 | [diff] [blame] | 16 | static int epoll_wait_loop(void) |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 17 | { |
| 18 | int i; |
| 19 | |
| 20 | /* Should fail NR_ITERS times */ |
| 21 | for (i = 0; i < NR_ITERS; i++) |
Arnaldo Carvalho de Melo | 4ffde49 | 2016-07-11 23:22:30 -0300 | [diff] [blame] | 22 | epoll_wait(-(i + 1), NULL, 0, 0); |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 23 | return 0; |
| 24 | } |
| 25 | |
Wang Nan | bbb7d49 | 2015-11-16 12:10:14 +0000 | [diff] [blame] | 26 | #ifdef HAVE_BPF_PROLOGUE |
| 27 | |
| 28 | static 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 | |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 49 | static 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, |
Arnaldo Carvalho de Melo | 030910c | 2016-11-29 12:38:14 -0300 | [diff] [blame] | 60 | "Basic BPF filtering", |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 61 | "[basic_bpf_test]", |
| 62 | "fix 'perf test LLVM' first", |
| 63 | "load bpf object failed", |
Arnaldo Carvalho de Melo | 4ffde49 | 2016-07-11 23:22:30 -0300 | [diff] [blame] | 64 | &epoll_wait_loop, |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 65 | (NR_ITERS + 1) / 2, |
| 66 | }, |
Wang Nan | bbb7d49 | 2015-11-16 12:10:14 +0000 | [diff] [blame] | 67 | #ifdef HAVE_BPF_PROLOGUE |
| 68 | { |
| 69 | LLVM_TESTCASE_BPF_PROLOGUE, |
Arnaldo Carvalho de Melo | 030910c | 2016-11-29 12:38:14 -0300 | [diff] [blame] | 70 | "BPF prologue generation", |
Wang Nan | bbb7d49 | 2015-11-16 12:10:14 +0000 | [diff] [blame] | 71 | "[bpf_prologue_test]", |
| 72 | "fix kbuild first", |
| 73 | "check your vmlinux setting?", |
| 74 | &llseek_loop, |
| 75 | (NR_ITERS + 1) / 4, |
| 76 | }, |
| 77 | #endif |
Wang Nan | 7b6982c | 2016-01-25 09:55:48 +0000 | [diff] [blame] | 78 | { |
| 79 | LLVM_TESTCASE_BPF_RELOCATION, |
Arnaldo Carvalho de Melo | 030910c | 2016-11-29 12:38:14 -0300 | [diff] [blame] | 80 | "BPF relocation checker", |
Wang Nan | 7b6982c | 2016-01-25 09:55:48 +0000 | [diff] [blame] | 81 | "[bpf_relocation_test]", |
| 82 | "fix 'perf test LLVM' first", |
| 83 | "libbpf error when dealing with relocation", |
| 84 | NULL, |
| 85 | 0, |
| 86 | }, |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 87 | }; |
| 88 | |
| 89 | static 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 | |
Wang Nan | 95088a5 | 2016-02-22 09:10:36 +0000 | [diff] [blame] | 115 | err = parse_events_load_bpf_obj(&parse_evlist, &parse_evlist.list, obj, NULL); |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 116 | if (err || list_empty(&parse_evlist.list)) { |
| 117 | pr_debug("Failed to add events selected by BPF\n"); |
Wang Nan | ad0dd7a | 2015-11-17 08:32:46 +0000 | [diff] [blame] | 118 | return TEST_FAIL; |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 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 | /* Instead of perf_evlist__new_default, don't add default events */ |
| 126 | evlist = perf_evlist__new(); |
| 127 | if (!evlist) { |
Alexander Alemayhu | 042cfb5 | 2016-10-13 18:18:11 +0200 | [diff] [blame] | 128 | pr_debug("Not enough memory to create evlist\n"); |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 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 | |
Arnaldo Carvalho de Melo | e68ae9c | 2016-04-11 18:15:29 -0300 | [diff] [blame] | 141 | perf_evlist__config(evlist, &opts, NULL); |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 142 | |
| 143 | err = perf_evlist__open(evlist); |
| 144 | if (err < 0) { |
| 145 | pr_debug("perf_evlist__open: %s\n", |
Arnaldo Carvalho de Melo | c8b5f2c | 2016-07-06 11:56:20 -0300 | [diff] [blame] | 146 | str_error_r(errno, sbuf, sizeof(sbuf))); |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 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", |
Arnaldo Carvalho de Melo | c8b5f2c | 2016-07-06 11:56:20 -0300 | [diff] [blame] | 153 | str_error_r(errno, sbuf, sizeof(sbuf))); |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 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 | |
Wang Nan | ad0dd7a | 2015-11-17 08:32:46 +0000 | [diff] [blame] | 172 | if (count != expect) { |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 173 | pr_debug("BPF filter result incorrect\n"); |
Wang Nan | ad0dd7a | 2015-11-17 08:32:46 +0000 | [diff] [blame] | 174 | goto out_delete_evlist; |
| 175 | } |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 176 | |
| 177 | ret = TEST_OK; |
| 178 | |
| 179 | out_delete_evlist: |
| 180 | perf_evlist__delete(evlist); |
| 181 | return ret; |
| 182 | } |
| 183 | |
| 184 | static struct bpf_object * |
| 185 | prepare_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 | |
Arnaldo Carvalho de Melo | 916d409 | 2015-11-18 17:38:49 -0300 | [diff] [blame] | 197 | static int __test__bpf(int idx) |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 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, |
Arnaldo Carvalho de Melo | 916d409 | 2015-11-18 17:38:49 -0300 | [diff] [blame] | 205 | bpf_testcase_table[idx].prog_id, |
Wang Nan | 7b6982c | 2016-01-25 09:55:48 +0000 | [diff] [blame] | 206 | true, NULL); |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 207 | if (ret != TEST_OK || !obj_buf || !obj_buf_sz) { |
| 208 | pr_debug("Unable to get BPF object, %s\n", |
Arnaldo Carvalho de Melo | 916d409 | 2015-11-18 17:38:49 -0300 | [diff] [blame] | 209 | bpf_testcase_table[idx].msg_compile_fail); |
| 210 | if (idx == 0) |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 211 | return TEST_SKIP; |
| 212 | else |
| 213 | return TEST_FAIL; |
| 214 | } |
| 215 | |
| 216 | obj = prepare_bpf(obj_buf, obj_buf_sz, |
Arnaldo Carvalho de Melo | 916d409 | 2015-11-18 17:38:49 -0300 | [diff] [blame] | 217 | bpf_testcase_table[idx].name); |
Wang Nan | 7b6982c | 2016-01-25 09:55:48 +0000 | [diff] [blame] | 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); |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 225 | ret = TEST_FAIL; |
| 226 | goto out; |
| 227 | } |
| 228 | |
Wang Nan | 7b6982c | 2016-01-25 09:55:48 +0000 | [diff] [blame] | 229 | if (obj) |
| 230 | ret = do_test(obj, |
| 231 | bpf_testcase_table[idx].target_func, |
| 232 | bpf_testcase_table[idx].expect_result); |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 233 | out: |
| 234 | bpf__clear(); |
| 235 | return ret; |
| 236 | } |
| 237 | |
Wang Nan | 77a0cf6 | 2015-11-17 08:32:49 +0000 | [diff] [blame] | 238 | int test__bpf_subtest_get_nr(void) |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 239 | { |
Wang Nan | 77a0cf6 | 2015-11-17 08:32:49 +0000 | [diff] [blame] | 240 | return (int)ARRAY_SIZE(bpf_testcase_table); |
| 241 | } |
| 242 | |
| 243 | const 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 | |
Wang Nan | 6a7d550 | 2016-01-25 09:55:53 +0000 | [diff] [blame] | 250 | static 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 | |
Wang Nan | 77a0cf6 | 2015-11-17 08:32:49 +0000 | [diff] [blame] | 280 | int test__bpf(int i) |
| 281 | { |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 282 | int err; |
| 283 | |
Wang Nan | 77a0cf6 | 2015-11-17 08:32:49 +0000 | [diff] [blame] | 284 | if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table)) |
| 285 | return TEST_FAIL; |
| 286 | |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 287 | if (geteuid() != 0) { |
| 288 | pr_debug("Only root can run BPF test\n"); |
| 289 | return TEST_SKIP; |
| 290 | } |
| 291 | |
Wang Nan | 6a7d550 | 2016-01-25 09:55:53 +0000 | [diff] [blame] | 292 | if (check_env()) |
| 293 | return TEST_SKIP; |
| 294 | |
Wang Nan | 77a0cf6 | 2015-11-17 08:32:49 +0000 | [diff] [blame] | 295 | err = __test__bpf(i); |
| 296 | return err; |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | #else |
Wang Nan | 77a0cf6 | 2015-11-17 08:32:49 +0000 | [diff] [blame] | 300 | int test__bpf_subtest_get_nr(void) |
| 301 | { |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | const char *test__bpf_subtest_get_desc(int i __maybe_unused) |
| 306 | { |
| 307 | return NULL; |
| 308 | } |
| 309 | |
| 310 | int test__bpf(int i __maybe_unused) |
Wang Nan | ba1fae4 | 2015-11-06 13:49:43 +0000 | [diff] [blame] | 311 | { |
| 312 | pr_debug("Skip BPF test because BPF support is not compiled\n"); |
| 313 | return TEST_SKIP; |
| 314 | } |
| 315 | #endif |