1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2016 Facebook
3  */
4 #define _GNU_SOURCE
5 #include <sched.h>
6 #include <stdio.h>
7 #include <sys/types.h>
8 #include <asm/unistd.h>
9 #include <unistd.h>
10 #include <assert.h>
11 #include <sys/wait.h>
12 #include <stdlib.h>
13 #include <signal.h>
14 #include <string.h>
15 #include <time.h>
16 #include <sys/resource.h>
17 #include <arpa/inet.h>
18 #include <errno.h>
19 
20 #include <bpf/bpf.h>
21 #include <bpf/libbpf.h>
22 
23 #define TEST_BIT(t) (1U << (t))
24 #define MAX_NR_CPUS 1024
25 
26 static __u64 time_get_ns(void)
27 {
28 	struct timespec ts;
29 
30 	clock_gettime(CLOCK_MONOTONIC, &ts);
31 	return ts.tv_sec * 1000000000ull + ts.tv_nsec;
32 }
33 
34 enum test_type {
35 	HASH_PREALLOC,
36 	PERCPU_HASH_PREALLOC,
37 	HASH_KMALLOC,
38 	PERCPU_HASH_KMALLOC,
39 	LRU_HASH_PREALLOC,
40 	NOCOMMON_LRU_HASH_PREALLOC,
41 	LPM_KMALLOC,
42 	HASH_LOOKUP,
43 	ARRAY_LOOKUP,
44 	INNER_LRU_HASH_PREALLOC,
45 	LRU_HASH_LOOKUP,
46 	NR_TESTS,
47 };
48 
49 const char *test_map_names[NR_TESTS] = {
50 	[HASH_PREALLOC] = "hash_map",
51 	[PERCPU_HASH_PREALLOC] = "percpu_hash_map",
52 	[HASH_KMALLOC] = "hash_map_alloc",
53 	[PERCPU_HASH_KMALLOC] = "percpu_hash_map_alloc",
54 	[LRU_HASH_PREALLOC] = "lru_hash_map",
55 	[NOCOMMON_LRU_HASH_PREALLOC] = "nocommon_lru_hash_map",
56 	[LPM_KMALLOC] = "lpm_trie_map_alloc",
57 	[HASH_LOOKUP] = "hash_map",
58 	[ARRAY_LOOKUP] = "array_map",
59 	[INNER_LRU_HASH_PREALLOC] = "inner_lru_hash_map",
60 	[LRU_HASH_LOOKUP] = "lru_hash_lookup_map",
61 };
62 
63 enum map_idx {
64 	array_of_lru_hashs_idx,
65 	hash_map_alloc_idx,
66 	lru_hash_lookup_idx,
67 	NR_IDXES,
68 };
69 
70 static int map_fd[NR_IDXES];
71 
72 static int test_flags = ~0;
73 static uint32_t num_map_entries;
74 static uint32_t inner_lru_hash_size;
75 static int lru_hash_lookup_test_entries = 32;
76 static uint32_t max_cnt = 1000000;
77 
78 static int check_test_flags(enum test_type t)
79 {
80 	return test_flags & TEST_BIT(t);
81 }
82 
83 static void test_hash_prealloc(int cpu)
84 {
85 	__u64 start_time;
86 	int i;
87 
88 	start_time = time_get_ns();
89 	for (i = 0; i < max_cnt; i++)
90 		syscall(__NR_getuid);
91 	printf("%d:hash_map_perf pre-alloc %lld events per sec\n",
92 	       cpu, max_cnt * 1000000000ll / (time_get_ns() - start_time));
93 }
94 
95 static int pre_test_lru_hash_lookup(int tasks)
96 {
97 	int fd = map_fd[lru_hash_lookup_idx];
98 	uint32_t key;
99 	long val = 1;
100 	int ret;
101 
102 	if (num_map_entries > lru_hash_lookup_test_entries)
103 		lru_hash_lookup_test_entries = num_map_entries;
104 
105 	/* Populate the lru_hash_map for LRU_HASH_LOOKUP perf test.
106 	 *
107 	 * It is fine that the user requests for a map with
108 	 * num_map_entries < 32 and some of the later lru hash lookup
109 	 * may return not found.  For LRU map, we are not interested
110 	 * in such small map performance.
111 	 */
112 	for (key = 0; key < lru_hash_lookup_test_entries; key++) {
113 		ret = bpf_map_update_elem(fd, &key, &val, BPF_NOEXIST);
114 		if (ret)
115 			return ret;
116 	}
117 
118 	return 0;
119 }
120 
121 static void do_test_lru(enum test_type test, int cpu)
122 {
123 	static int inner_lru_map_fds[MAX_NR_CPUS];
124 
125 	struct sockaddr_in6 in6 = { .sin6_family = AF_INET6 };
126 	const char *test_name;
127 	__u64 start_time;
128 	int i, ret;
129 
130 	if (test == INNER_LRU_HASH_PREALLOC && cpu) {
131 		/* If CPU is not 0, create inner_lru hash map and insert the fd
132 		 * value into the array_of_lru_hash map. In case of CPU 0,
133 		 * 'inner_lru_hash_map' was statically inserted on the map init
134 		 */
135 		int outer_fd = map_fd[array_of_lru_hashs_idx];
136 		unsigned int mycpu, mynode;
137 
138 		assert(cpu < MAX_NR_CPUS);
139 
140 		ret = syscall(__NR_getcpu, &mycpu, &mynode, NULL);
141 		assert(!ret);
142 
143 		inner_lru_map_fds[cpu] =
144 			bpf_create_map_node(BPF_MAP_TYPE_LRU_HASH,
145 					    test_map_names[INNER_LRU_HASH_PREALLOC],
146 					    sizeof(uint32_t),
147 					    sizeof(long),
148 					    inner_lru_hash_size, 0,
149 					    mynode);
150 		if (inner_lru_map_fds[cpu] == -1) {
151 			printf("cannot create BPF_MAP_TYPE_LRU_HASH %s(%d)\n",
152 			       strerror(errno), errno);
153 			exit(1);
154 		}
155 
156 		ret = bpf_map_update_elem(outer_fd, &cpu,
157 					  &inner_lru_map_fds[cpu],
158 					  BPF_ANY);
159 		if (ret) {
160 			printf("cannot update ARRAY_OF_LRU_HASHS with key:%u. %s(%d)\n",
161 			       cpu, strerror(errno), errno);
162 			exit(1);
163 		}
164 	}
165 
166 	in6.sin6_addr.s6_addr16[0] = 0xdead;
167 	in6.sin6_addr.s6_addr16[1] = 0xbeef;
168 
169 	if (test == LRU_HASH_PREALLOC) {
170 		test_name = "lru_hash_map_perf";
171 		in6.sin6_addr.s6_addr16[2] = 0;
172 	} else if (test == NOCOMMON_LRU_HASH_PREALLOC) {
173 		test_name = "nocommon_lru_hash_map_perf";
174 		in6.sin6_addr.s6_addr16[2] = 1;
175 	} else if (test == INNER_LRU_HASH_PREALLOC) {
176 		test_name = "inner_lru_hash_map_perf";
177 		in6.sin6_addr.s6_addr16[2] = 2;
178 	} else if (test == LRU_HASH_LOOKUP) {
179 		test_name = "lru_hash_lookup_perf";
180 		in6.sin6_addr.s6_addr16[2] = 3;
181 		in6.sin6_addr.s6_addr32[3] = 0;
182 	} else {
183 		assert(0);
184 	}
185 
186 	start_time = time_get_ns();
187 	for (i = 0; i < max_cnt; i++) {
188 		ret = connect(-1, (const struct sockaddr *)&in6, sizeof(in6));
189 		assert(ret == -1 && errno == EBADF);
190 		if (in6.sin6_addr.s6_addr32[3] <
191 		    lru_hash_lookup_test_entries - 32)
192 			in6.sin6_addr.s6_addr32[3] += 32;
193 		else
194 			in6.sin6_addr.s6_addr32[3] = 0;
195 	}
196 	printf("%d:%s pre-alloc %lld events per sec\n",
197 	       cpu, test_name,
198 	       max_cnt * 1000000000ll / (time_get_ns() - start_time));
199 }
200 
201 static void test_lru_hash_prealloc(int cpu)
202 {
203 	do_test_lru(LRU_HASH_PREALLOC, cpu);
204 }
205 
206 static void test_nocommon_lru_hash_prealloc(int cpu)
207 {
208 	do_test_lru(NOCOMMON_LRU_HASH_PREALLOC, cpu);
209 }
210 
211 static void test_inner_lru_hash_prealloc(int cpu)
212 {
213 	do_test_lru(INNER_LRU_HASH_PREALLOC, cpu);
214 }
215 
216 static void test_lru_hash_lookup(int cpu)
217 {
218 	do_test_lru(LRU_HASH_LOOKUP, cpu);
219 }
220 
221 static void test_percpu_hash_prealloc(int cpu)
222 {
223 	__u64 start_time;
224 	int i;
225 
226 	start_time = time_get_ns();
227 	for (i = 0; i < max_cnt; i++)
228 		syscall(__NR_geteuid);
229 	printf("%d:percpu_hash_map_perf pre-alloc %lld events per sec\n",
230 	       cpu, max_cnt * 1000000000ll / (time_get_ns() - start_time));
231 }
232 
233 static void test_hash_kmalloc(int cpu)
234 {
235 	__u64 start_time;
236 	int i;
237 
238 	start_time = time_get_ns();
239 	for (i = 0; i < max_cnt; i++)
240 		syscall(__NR_getgid);
241 	printf("%d:hash_map_perf kmalloc %lld events per sec\n",
242 	       cpu, max_cnt * 1000000000ll / (time_get_ns() - start_time));
243 }
244 
245 static void test_percpu_hash_kmalloc(int cpu)
246 {
247 	__u64 start_time;
248 	int i;
249 
250 	start_time = time_get_ns();
251 	for (i = 0; i < max_cnt; i++)
252 		syscall(__NR_getegid);
253 	printf("%d:percpu_hash_map_perf kmalloc %lld events per sec\n",
254 	       cpu, max_cnt * 1000000000ll / (time_get_ns() - start_time));
255 }
256 
257 static void test_lpm_kmalloc(int cpu)
258 {
259 	__u64 start_time;
260 	int i;
261 
262 	start_time = time_get_ns();
263 	for (i = 0; i < max_cnt; i++)
264 		syscall(__NR_gettid);
265 	printf("%d:lpm_perf kmalloc %lld events per sec\n",
266 	       cpu, max_cnt * 1000000000ll / (time_get_ns() - start_time));
267 }
268 
269 static void test_hash_lookup(int cpu)
270 {
271 	__u64 start_time;
272 	int i;
273 
274 	start_time = time_get_ns();
275 	for (i = 0; i < max_cnt; i++)
276 		syscall(__NR_getpgid, 0);
277 	printf("%d:hash_lookup %lld lookups per sec\n",
278 	       cpu, max_cnt * 1000000000ll * 64 / (time_get_ns() - start_time));
279 }
280 
281 static void test_array_lookup(int cpu)
282 {
283 	__u64 start_time;
284 	int i;
285 
286 	start_time = time_get_ns();
287 	for (i = 0; i < max_cnt; i++)
288 		syscall(__NR_getppid, 0);
289 	printf("%d:array_lookup %lld lookups per sec\n",
290 	       cpu, max_cnt * 1000000000ll * 64 / (time_get_ns() - start_time));
291 }
292 
293 typedef int (*pre_test_func)(int tasks);
294 const pre_test_func pre_test_funcs[] = {
295 	[LRU_HASH_LOOKUP] = pre_test_lru_hash_lookup,
296 };
297 
298 typedef void (*test_func)(int cpu);
299 const test_func test_funcs[] = {
300 	[HASH_PREALLOC] = test_hash_prealloc,
301 	[PERCPU_HASH_PREALLOC] = test_percpu_hash_prealloc,
302 	[HASH_KMALLOC] = test_hash_kmalloc,
303 	[PERCPU_HASH_KMALLOC] = test_percpu_hash_kmalloc,
304 	[LRU_HASH_PREALLOC] = test_lru_hash_prealloc,
305 	[NOCOMMON_LRU_HASH_PREALLOC] = test_nocommon_lru_hash_prealloc,
306 	[LPM_KMALLOC] = test_lpm_kmalloc,
307 	[HASH_LOOKUP] = test_hash_lookup,
308 	[ARRAY_LOOKUP] = test_array_lookup,
309 	[INNER_LRU_HASH_PREALLOC] = test_inner_lru_hash_prealloc,
310 	[LRU_HASH_LOOKUP] = test_lru_hash_lookup,
311 };
312 
313 static int pre_test(int tasks)
314 {
315 	int i;
316 
317 	for (i = 0; i < NR_TESTS; i++) {
318 		if (pre_test_funcs[i] && check_test_flags(i)) {
319 			int ret = pre_test_funcs[i](tasks);
320 
321 			if (ret)
322 				return ret;
323 		}
324 	}
325 
326 	return 0;
327 }
328 
329 static void loop(int cpu)
330 {
331 	cpu_set_t cpuset;
332 	int i;
333 
334 	CPU_ZERO(&cpuset);
335 	CPU_SET(cpu, &cpuset);
336 	sched_setaffinity(0, sizeof(cpuset), &cpuset);
337 
338 	for (i = 0; i < NR_TESTS; i++) {
339 		if (check_test_flags(i))
340 			test_funcs[i](cpu);
341 	}
342 }
343 
344 static void run_perf_test(int tasks)
345 {
346 	pid_t pid[tasks];
347 	int i;
348 
349 	assert(!pre_test(tasks));
350 
351 	for (i = 0; i < tasks; i++) {
352 		pid[i] = fork();
353 		if (pid[i] == 0) {
354 			loop(i);
355 			exit(0);
356 		} else if (pid[i] == -1) {
357 			printf("couldn't spawn #%d process\n", i);
358 			exit(1);
359 		}
360 	}
361 	for (i = 0; i < tasks; i++) {
362 		int status;
363 
364 		assert(waitpid(pid[i], &status, 0) == pid[i]);
365 		assert(status == 0);
366 	}
367 }
368 
369 static void fill_lpm_trie(void)
370 {
371 	struct bpf_lpm_trie_key *key;
372 	unsigned long value = 0;
373 	unsigned int i;
374 	int r;
375 
376 	key = alloca(sizeof(*key) + 4);
377 	key->prefixlen = 32;
378 
379 	for (i = 0; i < 512; ++i) {
380 		key->prefixlen = rand() % 33;
381 		key->data[0] = rand() & 0xff;
382 		key->data[1] = rand() & 0xff;
383 		key->data[2] = rand() & 0xff;
384 		key->data[3] = rand() & 0xff;
385 		r = bpf_map_update_elem(map_fd[hash_map_alloc_idx],
386 					key, &value, 0);
387 		assert(!r);
388 	}
389 
390 	key->prefixlen = 32;
391 	key->data[0] = 192;
392 	key->data[1] = 168;
393 	key->data[2] = 0;
394 	key->data[3] = 1;
395 	value = 128;
396 
397 	r = bpf_map_update_elem(map_fd[hash_map_alloc_idx], key, &value, 0);
398 	assert(!r);
399 }
400 
401 static void fixup_map(struct bpf_object *obj)
402 {
403 	struct bpf_map *map;
404 	int i;
405 
406 	bpf_object__for_each_map(map, obj) {
407 		const char *name = bpf_map__name(map);
408 
409 		/* Only change the max_entries for the enabled test(s) */
410 		for (i = 0; i < NR_TESTS; i++) {
411 			if (!strcmp(test_map_names[i], name) &&
412 			    (check_test_flags(i))) {
413 				bpf_map__resize(map, num_map_entries);
414 				continue;
415 			}
416 		}
417 	}
418 
419 	inner_lru_hash_size = num_map_entries;
420 }
421 
422 int main(int argc, char **argv)
423 {
424 	int nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
425 	struct bpf_link *links[8];
426 	struct bpf_program *prog;
427 	struct bpf_object *obj;
428 	struct bpf_map *map;
429 	char filename[256];
430 	int i = 0;
431 
432 	if (argc > 1)
433 		test_flags = atoi(argv[1]) ? : test_flags;
434 
435 	if (argc > 2)
436 		nr_cpus = atoi(argv[2]) ? : nr_cpus;
437 
438 	if (argc > 3)
439 		num_map_entries = atoi(argv[3]);
440 
441 	if (argc > 4)
442 		max_cnt = atoi(argv[4]);
443 
444 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
445 	obj = bpf_object__open_file(filename, NULL);
446 	if (libbpf_get_error(obj)) {
447 		fprintf(stderr, "ERROR: opening BPF object file failed\n");
448 		return 0;
449 	}
450 
451 	map = bpf_object__find_map_by_name(obj, "inner_lru_hash_map");
452 	if (libbpf_get_error(map)) {
453 		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
454 		goto cleanup;
455 	}
456 
457 	inner_lru_hash_size = bpf_map__max_entries(map);
458 	if (!inner_lru_hash_size) {
459 		fprintf(stderr, "ERROR: failed to get map attribute\n");
460 		goto cleanup;
461 	}
462 
463 	/* resize BPF map prior to loading */
464 	if (num_map_entries > 0)
465 		fixup_map(obj);
466 
467 	/* load BPF program */
468 	if (bpf_object__load(obj)) {
469 		fprintf(stderr, "ERROR: loading BPF object file failed\n");
470 		goto cleanup;
471 	}
472 
473 	map_fd[0] = bpf_object__find_map_fd_by_name(obj, "array_of_lru_hashs");
474 	map_fd[1] = bpf_object__find_map_fd_by_name(obj, "hash_map_alloc");
475 	map_fd[2] = bpf_object__find_map_fd_by_name(obj, "lru_hash_lookup_map");
476 	if (map_fd[0] < 0 || map_fd[1] < 0 || map_fd[2] < 0) {
477 		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
478 		goto cleanup;
479 	}
480 
481 	bpf_object__for_each_program(prog, obj) {
482 		links[i] = bpf_program__attach(prog);
483 		if (libbpf_get_error(links[i])) {
484 			fprintf(stderr, "ERROR: bpf_program__attach failed\n");
485 			links[i] = NULL;
486 			goto cleanup;
487 		}
488 		i++;
489 	}
490 
491 	fill_lpm_trie();
492 
493 	run_perf_test(nr_cpus);
494 
495 cleanup:
496 	for (i--; i >= 0; i--)
497 		bpf_link__destroy(links[i]);
498 
499 	bpf_object__close(obj);
500 	return 0;
501 }
502