samples/bpf/map_perf_test_user.c

   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 }