samples/bpf/xdp_monitor_user.c

   1 /* SPDX-License-Identifier: GPL-2.0
   2  * Copyright(c) 2017 Jesper Dangaard Brouer, Red Hat, Inc.
   3  */
   4 static const char *__doc__=
   5  "XDP monitor tool, based on tracepoints\n"
   6 ;
   7
   8 static const char *__doc_err_only__=
   9  " NOTICE: Only tracking XDP redirect errors\n"
  10  "         Enable TX success stats via '--stats'\n"
  11  "         (which comes with a per packet processing overhead)\n"
  12 ;
  13
  14 #include <errno.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <stdbool.h>
  18 #include <stdint.h>
  19 #include <string.h>
  20 #include <ctype.h>
  21 #include <unistd.h>
  22 #include <locale.h>
  23
  24 #include <sys/resource.h>
  25 #include <getopt.h>
  26 #include <net/if.h>
  27 #include <time.h>
  28
  29 #include <bpf/bpf.h>
  30 #include "bpf_load.h"
  31 #include "bpf_util.h"
  32
  33 static int verbose = 1;
  34 static bool debug = false;
  35
  36 static const struct option long_options[] = {
  37         {"help",        no_argument,            NULL, 'h' },
  38         {"debug",       no_argument,            NULL, 'D' },
  39         {"stats",       no_argument,            NULL, 'S' },
  40         {"sec",         required_argument,      NULL, 's' },
  41         {0, 0, NULL,  0 }
  42 };
  43
  44 /* C standard specifies two constants, EXIT_SUCCESS(0) and EXIT_FAILURE(1) */
  45 #define EXIT_FAIL_MEM   5
  46
  47 static void usage(char *argv[])
  48 {
  49         int i;
  50         printf("\nDOCUMENTATION:\n%s\n", __doc__);
  51         printf("\n");
  52         printf(" Usage: %s (options-see-below)\n",
  53                argv[0]);
  54         printf(" Listing options:\n");
  55         for (i = 0; long_options[i].name != 0; i++) {
  56                 printf(" --%-15s", long_options[i].name);
  57                 if (long_options[i].flag != NULL)
  58                         printf(" flag (internal value:%d)",
  59                                *long_options[i].flag);
  60                 else
  61                         printf("short-option: -%c",
  62                                long_options[i].val);
  63                 printf("\n");
  64         }
  65         printf("\n");
  66 }
  67
  68 #define NANOSEC_PER_SEC 1000000000 /* 10^9 */
  69 static __u64 gettime(void)
  70 {
  71         struct timespec t;
  72         int res;
  73
  74         res = clock_gettime(CLOCK_MONOTONIC, &t);
  75         if (res < 0) {
  76                 fprintf(stderr, "Error with gettimeofday! (%i)\n", res);
  77                 exit(EXIT_FAILURE);
  78         }
  79         return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
  80 }
  81
  82 enum {
  83         REDIR_SUCCESS = 0,
  84         REDIR_ERROR = 1,
  85 };
  86 #define REDIR_RES_MAX 2
  87 static const char *redir_names[REDIR_RES_MAX] = {
  88         [REDIR_SUCCESS] = "Success",
  89         [REDIR_ERROR]   = "Error",
  90 };
  91 static const char *err2str(int err)
  92 {
  93         if (err < REDIR_RES_MAX)
  94                 return redir_names[err];
  95         return NULL;
  96 }
  97 /* enum xdp_action */
  98 #define XDP_UNKNOWN     XDP_REDIRECT + 1
  99 #define XDP_ACTION_MAX (XDP_UNKNOWN + 1)
 100 static const char *xdp_action_names[XDP_ACTION_MAX] = {
 101         [XDP_ABORTED]   = "XDP_ABORTED",
 102         [XDP_DROP]      = "XDP_DROP",
 103         [XDP_PASS]      = "XDP_PASS",
 104         [XDP_TX]        = "XDP_TX",
 105         [XDP_REDIRECT]  = "XDP_REDIRECT",
 106         [XDP_UNKNOWN]   = "XDP_UNKNOWN",
 107 };
 108 static const char *action2str(int action)
 109 {
 110         if (action < XDP_ACTION_MAX)
 111                 return xdp_action_names[action];
 112         return NULL;
 113 }
 114
 115 /* Common stats data record shared with _kern.c */
 116 struct datarec {
 117         __u64 processed;
 118         __u64 dropped;
 119         __u64 info;
 120         __u64 err;
 121 };
 122 #define MAX_CPUS 64
 123
 124 /* Userspace structs for collection of stats from maps */
 125 struct record {
 126         __u64 timestamp;
 127         struct datarec total;
 128         struct datarec *cpu;
 129 };
 130 struct u64rec {
 131         __u64 processed;
 132 };
 133 struct record_u64 {
 134         /* record for _kern side __u64 values */
 135         __u64 timestamp;
 136         struct u64rec total;
 137         struct u64rec *cpu;
 138 };
 139
 140 struct stats_record {
 141         struct record_u64 xdp_redirect[REDIR_RES_MAX];
 142         struct record_u64 xdp_exception[XDP_ACTION_MAX];
 143         struct record xdp_cpumap_kthread;
 144         struct record xdp_cpumap_enqueue[MAX_CPUS];
 145         struct record xdp_devmap_xmit;
 146 };
 147
 148 static bool map_collect_record(int fd, __u32 key, struct record *rec)
 149 {
 150         /* For percpu maps, userspace gets a value per possible CPU */
 151         unsigned int nr_cpus = bpf_num_possible_cpus();
 152         struct datarec values[nr_cpus];
 153         __u64 sum_processed = 0;
 154         __u64 sum_dropped = 0;
 155         __u64 sum_info = 0;
 156         __u64 sum_err = 0;
 157         int i;
 158
 159         if ((bpf_map_lookup_elem(fd, &key, values)) != 0) {
 160                 fprintf(stderr,
 161                         "ERR: bpf_map_lookup_elem failed key:0x%X\n", key);
 162                 return false;
 163         }
 164         /* Get time as close as possible to reading map contents */
 165         rec->timestamp = gettime();
 166
 167         /* Record and sum values from each CPU */
 168         for (i = 0; i < nr_cpus; i++) {
 169                 rec->cpu[i].processed = values[i].processed;
 170                 sum_processed        += values[i].processed;
 171                 rec->cpu[i].dropped = values[i].dropped;
 172                 sum_dropped        += values[i].dropped;
 173                 rec->cpu[i].info = values[i].info;
 174                 sum_info        += values[i].info;
 175                 rec->cpu[i].err = values[i].err;
 176                 sum_err        += values[i].err;
 177         }
 178         rec->total.processed = sum_processed;
 179         rec->total.dropped   = sum_dropped;
 180         rec->total.info      = sum_info;
 181         rec->total.err       = sum_err;
 182         return true;
 183 }
 184
 185 static bool map_collect_record_u64(int fd, __u32 key, struct record_u64 *rec)
 186 {
 187         /* For percpu maps, userspace gets a value per possible CPU */
 188         unsigned int nr_cpus = bpf_num_possible_cpus();
 189         struct u64rec values[nr_cpus];
 190         __u64 sum_total = 0;
 191         int i;
 192
 193         if ((bpf_map_lookup_elem(fd, &key, values)) != 0) {
 194                 fprintf(stderr,
 195                         "ERR: bpf_map_lookup_elem failed key:0x%X\n", key);
 196                 return false;
 197         }
 198         /* Get time as close as possible to reading map contents */
 199         rec->timestamp = gettime();
 200
 201         /* Record and sum values from each CPU */
 202         for (i = 0; i < nr_cpus; i++) {
 203                 rec->cpu[i].processed = values[i].processed;
 204                 sum_total            += values[i].processed;
 205         }
 206         rec->total.processed = sum_total;
 207         return true;
 208 }
 209
 210 static double calc_period(struct record *r, struct record *p)
 211 {
 212         double period_ = 0;
 213         __u64 period = 0;
 214
 215         period = r->timestamp - p->timestamp;
 216         if (period > 0)
 217                 period_ = ((double) period / NANOSEC_PER_SEC);
 218
 219         return period_;
 220 }
 221
 222 static double calc_period_u64(struct record_u64 *r, struct record_u64 *p)
 223 {
 224         double period_ = 0;
 225         __u64 period = 0;
 226
 227         period = r->timestamp - p->timestamp;
 228         if (period > 0)
 229                 period_ = ((double) period / NANOSEC_PER_SEC);
 230
 231         return period_;
 232 }
 233
 234 static double calc_pps(struct datarec *r, struct datarec *p, double period)
 235 {
 236         __u64 packets = 0;
 237         double pps = 0;
 238
 239         if (period > 0) {
 240                 packets = r->processed - p->processed;
 241                 pps = packets / period;
 242         }
 243         return pps;
 244 }
 245
 246 static double calc_pps_u64(struct u64rec *r, struct u64rec *p, double period)
 247 {
 248         __u64 packets = 0;
 249         double pps = 0;
 250
 251         if (period > 0) {
 252                 packets = r->processed - p->processed;
 253                 pps = packets / period;
 254         }
 255         return pps;
 256 }
 257
 258 static double calc_drop(struct datarec *r, struct datarec *p, double period)
 259 {
 260         __u64 packets = 0;
 261         double pps = 0;
 262
 263         if (period > 0) {
 264                 packets = r->dropped - p->dropped;
 265                 pps = packets / period;
 266         }
 267         return pps;
 268 }
 269
 270 static double calc_info(struct datarec *r, struct datarec *p, double period)
 271 {
 272         __u64 packets = 0;
 273         double pps = 0;
 274
 275         if (period > 0) {
 276                 packets = r->info - p->info;
 277                 pps = packets / period;
 278         }
 279         return pps;
 280 }
 281
 282 static double calc_err(struct datarec *r, struct datarec *p, double period)
 283 {
 284         __u64 packets = 0;
 285         double pps = 0;
 286
 287         if (period > 0) {
 288                 packets = r->err - p->err;
 289                 pps = packets / period;
 290         }
 291         return pps;
 292 }
 293
 294 static void stats_print(struct stats_record *stats_rec,
 295                         struct stats_record *stats_prev,
 296                         bool err_only)
 297 {
 298         unsigned int nr_cpus = bpf_num_possible_cpus();
 299         int rec_i = 0, i, to_cpu;
 300         double t = 0, pps = 0;
 301
 302         /* Header */
 303         printf("%-15s %-7s %-12s %-12s %-9s\n",
 304                "XDP-event", "CPU:to", "pps", "drop-pps", "extra-info");
 305
 306         /* tracepoint: xdp:xdp_redirect_* */
 307         if (err_only)
 308                 rec_i = REDIR_ERROR;
 309
 310         for (; rec_i < REDIR_RES_MAX; rec_i++) {
 311                 struct record_u64 *rec, *prev;
 312                 char *fmt1 = "%-15s %-7d %'-12.0f %'-12.0f %s\n";
 313                 char *fmt2 = "%-15s %-7s %'-12.0f %'-12.0f %s\n";
 314
 315                 rec  =  &stats_rec->xdp_redirect[rec_i];
 316                 prev = &stats_prev->xdp_redirect[rec_i];
 317                 t = calc_period_u64(rec, prev);
 318
 319                 for (i = 0; i < nr_cpus; i++) {
 320                         struct u64rec *r = &rec->cpu[i];
 321                         struct u64rec *p = &prev->cpu[i];
 322
 323                         pps = calc_pps_u64(r, p, t);
 324                         if (pps > 0)
 325                                 printf(fmt1, "XDP_REDIRECT", i,
 326                                        rec_i ? 0.0: pps, rec_i ? pps : 0.0,
 327                                        err2str(rec_i));
 328                 }
 329                 pps = calc_pps_u64(&rec->total, &prev->total, t);
 330                 printf(fmt2, "XDP_REDIRECT", "total",
 331                        rec_i ? 0.0: pps, rec_i ? pps : 0.0, err2str(rec_i));
 332         }
 333
 334         /* tracepoint: xdp:xdp_exception */
 335         for (rec_i = 0; rec_i < XDP_ACTION_MAX; rec_i++) {
 336                 struct record_u64 *rec, *prev;
 337                 char *fmt1 = "%-15s %-7d %'-12.0f %'-12.0f %s\n";
 338                 char *fmt2 = "%-15s %-7s %'-12.0f %'-12.0f %s\n";
 339
 340                 rec  =  &stats_rec->xdp_exception[rec_i];
 341                 prev = &stats_prev->xdp_exception[rec_i];
 342                 t = calc_period_u64(rec, prev);
 343
 344                 for (i = 0; i < nr_cpus; i++) {
 345                         struct u64rec *r = &rec->cpu[i];
 346                         struct u64rec *p = &prev->cpu[i];
 347
 348                         pps = calc_pps_u64(r, p, t);
 349                         if (pps > 0)
 350                                 printf(fmt1, "Exception", i,
 351                                        0.0, pps, action2str(rec_i));
 352                 }
 353                 pps = calc_pps_u64(&rec->total, &prev->total, t);
 354                 if (pps > 0)
 355                         printf(fmt2, "Exception", "total",
 356                                0.0, pps, action2str(rec_i));
 357         }
 358
 359         /* cpumap enqueue stats */
 360         for (to_cpu = 0; to_cpu < MAX_CPUS; to_cpu++) {
 361                 char *fmt1 = "%-15s %3d:%-3d %'-12.0f %'-12.0f %'-10.2f %s\n";
 362                 char *fmt2 = "%-15s %3s:%-3d %'-12.0f %'-12.0f %'-10.2f %s\n";
 363                 struct record *rec, *prev;
 364                 char *info_str = "";
 365                 double drop, info;
 366
 367                 rec  =  &stats_rec->xdp_cpumap_enqueue[to_cpu];
 368                 prev = &stats_prev->xdp_cpumap_enqueue[to_cpu];
 369                 t = calc_period(rec, prev);
 370                 for (i = 0; i < nr_cpus; i++) {
 371                         struct datarec *r = &rec->cpu[i];
 372                         struct datarec *p = &prev->cpu[i];
 373
 374                         pps  = calc_pps(r, p, t);
 375                         drop = calc_drop(r, p, t);
 376                         info = calc_info(r, p, t);
 377                         if (info > 0) {
 378                                 info_str = "bulk-average";
 379                                 info = pps / info; /* calc average bulk size */
 380                         }
 381                         if (pps > 0)
 382                                 printf(fmt1, "cpumap-enqueue",
 383                                        i, to_cpu, pps, drop, info, info_str);
 384                 }
 385                 pps = calc_pps(&rec->total, &prev->total, t);
 386                 if (pps > 0) {
 387                         drop = calc_drop(&rec->total, &prev->total, t);
 388                         info = calc_info(&rec->total, &prev->total, t);
 389                         if (info > 0) {
 390                                 info_str = "bulk-average";
 391                                 info = pps / info; /* calc average bulk size */
 392                         }
 393                         printf(fmt2, "cpumap-enqueue",
 394                                "sum", to_cpu, pps, drop, info, info_str);
 395                 }
 396         }
 397
 398         /* cpumap kthread stats */
 399         {
 400                 char *fmt1 = "%-15s %-7d %'-12.0f %'-12.0f %'-10.0f %s\n";
 401                 char *fmt2 = "%-15s %-7s %'-12.0f %'-12.0f %'-10.0f %s\n";
 402                 struct record *rec, *prev;
 403                 double drop, info;
 404                 char *i_str = "";
 405
 406                 rec  =  &stats_rec->xdp_cpumap_kthread;
 407                 prev = &stats_prev->xdp_cpumap_kthread;
 408                 t = calc_period(rec, prev);
 409                 for (i = 0; i < nr_cpus; i++) {
 410                         struct datarec *r = &rec->cpu[i];
 411                         struct datarec *p = &prev->cpu[i];
 412
 413                         pps  = calc_pps(r, p, t);
 414                         drop = calc_drop(r, p, t);
 415                         info = calc_info(r, p, t);
 416                         if (info > 0)
 417                                 i_str = "sched";
 418                         if (pps > 0 || drop > 0)
 419                                 printf(fmt1, "cpumap-kthread",
 420                                        i, pps, drop, info, i_str);
 421                 }
 422                 pps = calc_pps(&rec->total, &prev->total, t);
 423                 drop = calc_drop(&rec->total, &prev->total, t);
 424                 info = calc_info(&rec->total, &prev->total, t);
 425                 if (info > 0)
 426                         i_str = "sched-sum";
 427                 printf(fmt2, "cpumap-kthread", "total", pps, drop, info, i_str);
 428         }
 429
 430         /* devmap ndo_xdp_xmit stats */
 431         {
 432                 char *fmt1 = "%-15s %-7d %'-12.0f %'-12.0f %'-10.2f %s %s\n";
 433                 char *fmt2 = "%-15s %-7s %'-12.0f %'-12.0f %'-10.2f %s %s\n";
 434                 struct record *rec, *prev;
 435                 double drop, info, err;
 436                 char *i_str = "";
 437                 char *err_str = "";
 438
 439                 rec  =  &stats_rec->xdp_devmap_xmit;
 440                 prev = &stats_prev->xdp_devmap_xmit;
 441                 t = calc_period(rec, prev);
 442                 for (i = 0; i < nr_cpus; i++) {
 443                         struct datarec *r = &rec->cpu[i];
 444                         struct datarec *p = &prev->cpu[i];
 445
 446                         pps  = calc_pps(r, p, t);
 447                         drop = calc_drop(r, p, t);
 448                         info = calc_info(r, p, t);
 449                         err  = calc_err(r, p, t);
 450                         if (info > 0) {
 451                                 i_str = "bulk-average";
 452                                 info = (pps+drop) / info; /* calc avg bulk */
 453                         }
 454                         if (err > 0)
 455                                 err_str = "drv-err";
 456                         if (pps > 0 || drop > 0)
 457                                 printf(fmt1, "devmap-xmit",
 458                                        i, pps, drop, info, i_str, err_str);
 459                 }
 460                 pps = calc_pps(&rec->total, &prev->total, t);
 461                 drop = calc_drop(&rec->total, &prev->total, t);
 462                 info = calc_info(&rec->total, &prev->total, t);
 463                 err  = calc_err(&rec->total, &prev->total, t);
 464                 if (info > 0) {
 465                         i_str = "bulk-average";
 466                         info = (pps+drop) / info; /* calc avg bulk */
 467                 }
 468                 if (err > 0)
 469                         err_str = "drv-err";
 470                 printf(fmt2, "devmap-xmit", "total", pps, drop,
 471                        info, i_str, err_str);
 472         }
 473
 474         printf("\n");
 475 }
 476
 477 static bool stats_collect(struct stats_record *rec)
 478 {
 479         int fd;
 480         int i;
 481
 482         /* TODO: Detect if someone unloaded the perf event_fd's, as
 483          * this can happen by someone running perf-record -e
 484          */
 485
 486         fd = map_data[0].fd; /* map0: redirect_err_cnt */
 487         for (i = 0; i < REDIR_RES_MAX; i++)
 488                 map_collect_record_u64(fd, i, &rec->xdp_redirect[i]);
 489
 490         fd = map_data[1].fd; /* map1: exception_cnt */
 491         for (i = 0; i < XDP_ACTION_MAX; i++) {
 492                 map_collect_record_u64(fd, i, &rec->xdp_exception[i]);
 493         }
 494
 495         fd = map_data[2].fd; /* map2: cpumap_enqueue_cnt */
 496         for (i = 0; i < MAX_CPUS; i++)
 497                 map_collect_record(fd, i, &rec->xdp_cpumap_enqueue[i]);
 498
 499         fd = map_data[3].fd; /* map3: cpumap_kthread_cnt */
 500         map_collect_record(fd, 0, &rec->xdp_cpumap_kthread);
 501
 502         fd = map_data[4].fd; /* map4: devmap_xmit_cnt */
 503         map_collect_record(fd, 0, &rec->xdp_devmap_xmit);
 504
 505         return true;
 506 }
 507
 508 static void *alloc_rec_per_cpu(int record_size)
 509 {
 510         unsigned int nr_cpus = bpf_num_possible_cpus();
 511         void *array;
 512         size_t size;
 513
 514         size = record_size * nr_cpus;
 515         array = malloc(size);
 516         memset(array, 0, size);
 517         if (!array) {
 518                 fprintf(stderr, "Mem alloc error (nr_cpus:%u)\n", nr_cpus);
 519                 exit(EXIT_FAIL_MEM);
 520         }
 521         return array;
 522 }
 523
 524 static struct stats_record *alloc_stats_record(void)
 525 {
 526         struct stats_record *rec;
 527         int rec_sz;
 528         int i;
 529
 530         /* Alloc main stats_record structure */
 531         rec = malloc(sizeof(*rec));
 532         memset(rec, 0, sizeof(*rec));
 533         if (!rec) {
 534                 fprintf(stderr, "Mem alloc error\n");
 535                 exit(EXIT_FAIL_MEM);
 536         }
 537
 538         /* Alloc stats stored per CPU for each record */
 539         rec_sz = sizeof(struct u64rec);
 540         for (i = 0; i < REDIR_RES_MAX; i++)
 541                 rec->xdp_redirect[i].cpu = alloc_rec_per_cpu(rec_sz);
 542
 543         for (i = 0; i < XDP_ACTION_MAX; i++)
 544                 rec->xdp_exception[i].cpu = alloc_rec_per_cpu(rec_sz);
 545
 546         rec_sz = sizeof(struct datarec);
 547         rec->xdp_cpumap_kthread.cpu = alloc_rec_per_cpu(rec_sz);
 548         rec->xdp_devmap_xmit.cpu    = alloc_rec_per_cpu(rec_sz);
 549
 550         for (i = 0; i < MAX_CPUS; i++)
 551                 rec->xdp_cpumap_enqueue[i].cpu = alloc_rec_per_cpu(rec_sz);
 552
 553         return rec;
 554 }
 555
 556 static void free_stats_record(struct stats_record *r)
 557 {
 558         int i;
 559
 560         for (i = 0; i < REDIR_RES_MAX; i++)
 561                 free(r->xdp_redirect[i].cpu);
 562
 563         for (i = 0; i < XDP_ACTION_MAX; i++)
 564                 free(r->xdp_exception[i].cpu);
 565
 566         free(r->xdp_cpumap_kthread.cpu);
 567         free(r->xdp_devmap_xmit.cpu);
 568
 569         for (i = 0; i < MAX_CPUS; i++)
 570                 free(r->xdp_cpumap_enqueue[i].cpu);
 571
 572         free(r);
 573 }
 574
 575 /* Pointer swap trick */
 576 static inline void swap(struct stats_record **a, struct stats_record **b)
 577 {
 578         struct stats_record *tmp;
 579
 580         tmp = *a;
 581         *a = *b;
 582         *b = tmp;
 583 }
 584
 585 static void stats_poll(int interval, bool err_only)
 586 {
 587         struct stats_record *rec, *prev;
 588
 589         rec  = alloc_stats_record();
 590         prev = alloc_stats_record();
 591         stats_collect(rec);
 592
 593         if (err_only)
 594                 printf("\n%s\n", __doc_err_only__);
 595
 596         /* Trick to pretty printf with thousands separators use %' */
 597         setlocale(LC_NUMERIC, "en_US");
 598
 599         /* Header */
 600         if (verbose)
 601                 printf("\n%s", __doc__);
 602
 603         /* TODO Need more advanced stats on error types */
 604         if (verbose) {
 605                 printf(" - Stats map0: %s\n", map_data[0].name);
 606                 printf(" - Stats map1: %s\n", map_data[1].name);
 607                 printf("\n");
 608         }
 609         fflush(stdout);
 610
 611         while (1) {
 612                 swap(&prev, &rec);
 613                 stats_collect(rec);
 614                 stats_print(rec, prev, err_only);
 615                 fflush(stdout);
 616                 sleep(interval);
 617         }
 618
 619         free_stats_record(rec);
 620         free_stats_record(prev);
 621 }
 622
 623 static void print_bpf_prog_info(void)
 624 {
 625         int i;
 626
 627         /* Prog info */
 628         printf("Loaded BPF prog have %d bpf program(s)\n", prog_cnt);
 629         for (i = 0; i < prog_cnt; i++) {
 630                 printf(" - prog_fd[%d] = fd(%d)\n", i, prog_fd[i]);
 631         }
 632
 633         /* Maps info */
 634         printf("Loaded BPF prog have %d map(s)\n", map_data_count);
 635         for (i = 0; i < map_data_count; i++) {
 636                 char *name = map_data[i].name;
 637                 int fd     = map_data[i].fd;
 638
 639                 printf(" - map_data[%d] = fd(%d) name:%s\n", i, fd, name);
 640         }
 641
 642         /* Event info */
 643         printf("Searching for (max:%d) event file descriptor(s)\n", prog_cnt);
 644         for (i = 0; i < prog_cnt; i++) {
 645                 if (event_fd[i] != -1)
 646                         printf(" - event_fd[%d] = fd(%d)\n", i, event_fd[i]);
 647         }
 648 }
 649
 650 int main(int argc, char **argv)
 651 {
 652         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 653         int longindex = 0, opt;
 654         int ret = EXIT_SUCCESS;
 655         char bpf_obj_file[256];
 656
 657         /* Default settings: */
 658         bool errors_only = true;
 659         int interval = 2;
 660
 661         snprintf(bpf_obj_file, sizeof(bpf_obj_file), "%s_kern.o", argv[0]);
 662
 663         /* Parse commands line args */
 664         while ((opt = getopt_long(argc, argv, "hDSs:",
 665                                   long_options, &longindex)) != -1) {
 666                 switch (opt) {
 667                 case 'D':
 668                         debug = true;
 669                         break;
 670                 case 'S':
 671                         errors_only = false;
 672                         break;
 673                 case 's':
 674                         interval = atoi(optarg);
 675                         break;
 676                 case 'h':
 677                 default:
 678                         usage(argv);
 679                         return EXIT_FAILURE;
 680                 }
 681         }
 682
 683         if (setrlimit(RLIMIT_MEMLOCK, &r)) {
 684                 perror("setrlimit(RLIMIT_MEMLOCK)");
 685                 return EXIT_FAILURE;
 686         }
 687
 688         if (load_bpf_file(bpf_obj_file)) {
 689                 printf("ERROR - bpf_log_buf: %s", bpf_log_buf);
 690                 return EXIT_FAILURE;
 691         }
 692         if (!prog_fd[0]) {
 693                 printf("ERROR - load_bpf_file: %s\n", strerror(errno));
 694                 return EXIT_FAILURE;
 695         }
 696
 697         if (debug) {
 698                 print_bpf_prog_info();
 699         }
 700
 701         /* Unload/stop tracepoint event by closing fd's */
 702         if (errors_only) {
 703                 /* The prog_fd[i] and event_fd[i] depend on the
 704                  * order the functions was defined in _kern.c
 705                  */
 706                 close(event_fd[2]); /* tracepoint/xdp/xdp_redirect */
 707                 close(prog_fd[2]);  /* func: trace_xdp_redirect */
 708                 close(event_fd[3]); /* tracepoint/xdp/xdp_redirect_map */
 709                 close(prog_fd[3]);  /* func: trace_xdp_redirect_map */
 710         }
 711
 712         stats_poll(interval, errors_only);
 713
 714         return ret;
 715 }