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