samples/bpf/xdp_redirect_cpu_user.c

   1 /* GPLv2 Copyright(c) 2017 Jesper Dangaard Brouer, Red Hat, Inc.
   2  */
   3 static const char *__doc__ =
   4         " XDP redirect with a CPU-map type \"BPF_MAP_TYPE_CPUMAP\"";
   5
   6 #include <errno.h>
   7 #include <signal.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <stdbool.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <locale.h>
  14 #include <sys/resource.h>
  15 #include <getopt.h>
  16 #include <net/if.h>
  17 #include <time.h>
  18
  19 #include <arpa/inet.h>
  20 #include <linux/if_link.h>
  21
  22 #define MAX_CPUS 64 /* WARNING - sync with _kern.c */
  23
  24 /* How many xdp_progs are defined in _kern.c */
  25 #define MAX_PROG 6
  26
  27 #include <bpf/bpf.h>
  28 #include "bpf/libbpf.h"
  29
  30 #include "bpf_util.h"
  31
  32 static int ifindex = -1;
  33 static char ifname_buf[IF_NAMESIZE];
  34 static char *ifname;
  35 static __u32 prog_id;
  36
  37 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
  38 static int cpu_map_fd;
  39 static int rx_cnt_map_fd;
  40 static int redirect_err_cnt_map_fd;
  41 static int cpumap_enqueue_cnt_map_fd;
  42 static int cpumap_kthread_cnt_map_fd;
  43 static int cpus_available_map_fd;
  44 static int cpus_count_map_fd;
  45 static int cpus_iterator_map_fd;
  46 static int exception_cnt_map_fd;
  47
  48 /* Exit return codes */
  49 #define EXIT_OK         0
  50 #define EXIT_FAIL               1
  51 #define EXIT_FAIL_OPTION        2
  52 #define EXIT_FAIL_XDP           3
  53 #define EXIT_FAIL_BPF           4
  54 #define EXIT_FAIL_MEM           5
  55
  56 static const struct option long_options[] = {
  57         {"help",        no_argument,            NULL, 'h' },
  58         {"dev",         required_argument,      NULL, 'd' },
  59         {"skb-mode",    no_argument,            NULL, 'S' },
  60         {"sec",         required_argument,      NULL, 's' },
  61         {"progname",    required_argument,      NULL, 'p' },
  62         {"qsize",       required_argument,      NULL, 'q' },
  63         {"cpu",         required_argument,      NULL, 'c' },
  64         {"stress-mode", no_argument,            NULL, 'x' },
  65         {"no-separators", no_argument,          NULL, 'z' },
  66         {"force",       no_argument,            NULL, 'F' },
  67         {0, 0, NULL,  0 }
  68 };
  69
  70 static void int_exit(int sig)
  71 {
  72         __u32 curr_prog_id = 0;
  73
  74         if (ifindex > -1) {
  75                 if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
  76                         printf("bpf_get_link_xdp_id failed\n");
  77                         exit(EXIT_FAIL);
  78                 }
  79                 if (prog_id == curr_prog_id) {
  80                         fprintf(stderr,
  81                                 "Interrupted: Removing XDP program on ifindex:%d device:%s\n",
  82                                 ifindex, ifname);
  83                         bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
  84                 } else if (!curr_prog_id) {
  85                         printf("couldn't find a prog id on a given iface\n");
  86                 } else {
  87                         printf("program on interface changed, not removing\n");
  88                 }
  89         }
  90         exit(EXIT_OK);
  91 }
  92
  93 static void print_avail_progs(struct bpf_object *obj)
  94 {
  95         struct bpf_program *pos;
  96
  97         bpf_object__for_each_program(pos, obj) {
  98                 if (bpf_program__is_xdp(pos))
  99                         printf(" %s\n", bpf_program__title(pos, false));
 100         }
 101 }
 102
 103 static void usage(char *argv[], struct bpf_object *obj)
 104 {
 105         int i;
 106
 107         printf("\nDOCUMENTATION:\n%s\n", __doc__);
 108         printf("\n");
 109         printf(" Usage: %s (options-see-below)\n", argv[0]);
 110         printf(" Listing options:\n");
 111         for (i = 0; long_options[i].name != 0; i++) {
 112                 printf(" --%-12s", long_options[i].name);
 113                 if (long_options[i].flag != NULL)
 114                         printf(" flag (internal value:%d)",
 115                                 *long_options[i].flag);
 116                 else
 117                         printf(" short-option: -%c",
 118                                 long_options[i].val);
 119                 printf("\n");
 120         }
 121         printf("\n Programs to be used for --progname:\n");
 122         print_avail_progs(obj);
 123         printf("\n");
 124 }
 125
 126 /* gettime returns the current time of day in nanoseconds.
 127  * Cost: clock_gettime (ns) => 26ns (CLOCK_MONOTONIC)
 128  *       clock_gettime (ns) =>  9ns (CLOCK_MONOTONIC_COARSE)
 129  */
 130 #define NANOSEC_PER_SEC 1000000000 /* 10^9 */
 131 static __u64 gettime(void)
 132 {
 133         struct timespec t;
 134         int res;
 135
 136         res = clock_gettime(CLOCK_MONOTONIC, &t);
 137         if (res < 0) {
 138                 fprintf(stderr, "Error with gettimeofday! (%i)\n", res);
 139                 exit(EXIT_FAIL);
 140         }
 141         return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
 142 }
 143
 144 /* Common stats data record shared with _kern.c */
 145 struct datarec {
 146         __u64 processed;
 147         __u64 dropped;
 148         __u64 issue;
 149 };
 150 struct record {
 151         __u64 timestamp;
 152         struct datarec total;
 153         struct datarec *cpu;
 154 };
 155 struct stats_record {
 156         struct record rx_cnt;
 157         struct record redir_err;
 158         struct record kthread;
 159         struct record exception;
 160         struct record enq[MAX_CPUS];
 161 };
 162
 163 static bool map_collect_percpu(int fd, __u32 key, struct record *rec)
 164 {
 165         /* For percpu maps, userspace gets a value per possible CPU */
 166         unsigned int nr_cpus = bpf_num_possible_cpus();
 167         struct datarec values[nr_cpus];
 168         __u64 sum_processed = 0;
 169         __u64 sum_dropped = 0;
 170         __u64 sum_issue = 0;
 171         int i;
 172
 173         if ((bpf_map_lookup_elem(fd, &key, values)) != 0) {
 174                 fprintf(stderr,
 175                         "ERR: bpf_map_lookup_elem failed key:0x%X\n", key);
 176                 return false;
 177         }
 178         /* Get time as close as possible to reading map contents */
 179         rec->timestamp = gettime();
 180
 181         /* Record and sum values from each CPU */
 182         for (i = 0; i < nr_cpus; i++) {
 183                 rec->cpu[i].processed = values[i].processed;
 184                 sum_processed        += values[i].processed;
 185                 rec->cpu[i].dropped = values[i].dropped;
 186                 sum_dropped        += values[i].dropped;
 187                 rec->cpu[i].issue = values[i].issue;
 188                 sum_issue        += values[i].issue;
 189         }
 190         rec->total.processed = sum_processed;
 191         rec->total.dropped   = sum_dropped;
 192         rec->total.issue     = sum_issue;
 193         return true;
 194 }
 195
 196 static struct datarec *alloc_record_per_cpu(void)
 197 {
 198         unsigned int nr_cpus = bpf_num_possible_cpus();
 199         struct datarec *array;
 200         size_t size;
 201
 202         size = sizeof(struct datarec) * nr_cpus;
 203         array = malloc(size);
 204         memset(array, 0, size);
 205         if (!array) {
 206                 fprintf(stderr, "Mem alloc error (nr_cpus:%u)\n", nr_cpus);
 207                 exit(EXIT_FAIL_MEM);
 208         }
 209         return array;
 210 }
 211
 212 static struct stats_record *alloc_stats_record(void)
 213 {
 214         struct stats_record *rec;
 215         int i;
 216
 217         rec = malloc(sizeof(*rec));
 218         memset(rec, 0, sizeof(*rec));
 219         if (!rec) {
 220                 fprintf(stderr, "Mem alloc error\n");
 221                 exit(EXIT_FAIL_MEM);
 222         }
 223         rec->rx_cnt.cpu    = alloc_record_per_cpu();
 224         rec->redir_err.cpu = alloc_record_per_cpu();
 225         rec->kthread.cpu   = alloc_record_per_cpu();
 226         rec->exception.cpu = alloc_record_per_cpu();
 227         for (i = 0; i < MAX_CPUS; i++)
 228                 rec->enq[i].cpu = alloc_record_per_cpu();
 229
 230         return rec;
 231 }
 232
 233 static void free_stats_record(struct stats_record *r)
 234 {
 235         int i;
 236
 237         for (i = 0; i < MAX_CPUS; i++)
 238                 free(r->enq[i].cpu);
 239         free(r->exception.cpu);
 240         free(r->kthread.cpu);
 241         free(r->redir_err.cpu);
 242         free(r->rx_cnt.cpu);
 243         free(r);
 244 }
 245
 246 static double calc_period(struct record *r, struct record *p)
 247 {
 248         double period_ = 0;
 249         __u64 period = 0;
 250
 251         period = r->timestamp - p->timestamp;
 252         if (period > 0)
 253                 period_ = ((double) period / NANOSEC_PER_SEC);
 254
 255         return period_;
 256 }
 257
 258 static __u64 calc_pps(struct datarec *r, struct datarec *p, double period_)
 259 {
 260         __u64 packets = 0;
 261         __u64 pps = 0;
 262
 263         if (period_ > 0) {
 264                 packets = r->processed - p->processed;
 265                 pps = packets / period_;
 266         }
 267         return pps;
 268 }
 269
 270 static __u64 calc_drop_pps(struct datarec *r, struct datarec *p, double period_)
 271 {
 272         __u64 packets = 0;
 273         __u64 pps = 0;
 274
 275         if (period_ > 0) {
 276                 packets = r->dropped - p->dropped;
 277                 pps = packets / period_;
 278         }
 279         return pps;
 280 }
 281
 282 static __u64 calc_errs_pps(struct datarec *r,
 283                             struct datarec *p, double period_)
 284 {
 285         __u64 packets = 0;
 286         __u64 pps = 0;
 287
 288         if (period_ > 0) {
 289                 packets = r->issue - p->issue;
 290                 pps = packets / period_;
 291         }
 292         return pps;
 293 }
 294
 295 static void stats_print(struct stats_record *stats_rec,
 296                         struct stats_record *stats_prev,
 297                         char *prog_name)
 298 {
 299         unsigned int nr_cpus = bpf_num_possible_cpus();
 300         double pps = 0, drop = 0, err = 0;
 301         struct record *rec, *prev;
 302         int to_cpu;
 303         double t;
 304         int i;
 305
 306         /* Header */
 307         printf("Running XDP/eBPF prog_name:%s\n", prog_name);
 308         printf("%-15s %-7s %-14s %-11s %-9s\n",
 309                "XDP-cpumap", "CPU:to", "pps", "drop-pps", "extra-info");
 310
 311         /* XDP rx_cnt */
 312         {
 313                 char *fmt_rx = "%-15s %-7d %'-14.0f %'-11.0f %'-10.0f %s\n";
 314                 char *fm2_rx = "%-15s %-7s %'-14.0f %'-11.0f\n";
 315                 char *errstr = "";
 316
 317                 rec  = &stats_rec->rx_cnt;
 318                 prev = &stats_prev->rx_cnt;
 319                 t = calc_period(rec, prev);
 320                 for (i = 0; i < nr_cpus; i++) {
 321                         struct datarec *r = &rec->cpu[i];
 322                         struct datarec *p = &prev->cpu[i];
 323
 324                         pps = calc_pps(r, p, t);
 325                         drop = calc_drop_pps(r, p, t);
 326                         err  = calc_errs_pps(r, p, t);
 327                         if (err > 0)
 328                                 errstr = "cpu-dest/err";
 329                         if (pps > 0)
 330                                 printf(fmt_rx, "XDP-RX",
 331                                         i, pps, drop, err, errstr);
 332                 }
 333                 pps  = calc_pps(&rec->total, &prev->total, t);
 334                 drop = calc_drop_pps(&rec->total, &prev->total, t);
 335                 err  = calc_errs_pps(&rec->total, &prev->total, t);
 336                 printf(fm2_rx, "XDP-RX", "total", pps, drop);
 337         }
 338
 339         /* cpumap enqueue stats */
 340         for (to_cpu = 0; to_cpu < MAX_CPUS; to_cpu++) {
 341                 char *fmt = "%-15s %3d:%-3d %'-14.0f %'-11.0f %'-10.2f %s\n";
 342                 char *fm2 = "%-15s %3s:%-3d %'-14.0f %'-11.0f %'-10.2f %s\n";
 343                 char *errstr = "";
 344
 345                 rec  =  &stats_rec->enq[to_cpu];
 346                 prev = &stats_prev->enq[to_cpu];
 347                 t = calc_period(rec, prev);
 348                 for (i = 0; i < nr_cpus; i++) {
 349                         struct datarec *r = &rec->cpu[i];
 350                         struct datarec *p = &prev->cpu[i];
 351
 352                         pps  = calc_pps(r, p, t);
 353                         drop = calc_drop_pps(r, p, t);
 354                         err  = calc_errs_pps(r, p, t);
 355                         if (err > 0) {
 356                                 errstr = "bulk-average";
 357                                 err = pps / err; /* calc average bulk size */
 358                         }
 359                         if (pps > 0)
 360                                 printf(fmt, "cpumap-enqueue",
 361                                        i, to_cpu, pps, drop, err, errstr);
 362                 }
 363                 pps = calc_pps(&rec->total, &prev->total, t);
 364                 if (pps > 0) {
 365                         drop = calc_drop_pps(&rec->total, &prev->total, t);
 366                         err  = calc_errs_pps(&rec->total, &prev->total, t);
 367                         if (err > 0) {
 368                                 errstr = "bulk-average";
 369                                 err = pps / err; /* calc average bulk size */
 370                         }
 371                         printf(fm2, "cpumap-enqueue",
 372                                "sum", to_cpu, pps, drop, err, errstr);
 373                 }
 374         }
 375
 376         /* cpumap kthread stats */
 377         {
 378                 char *fmt_k = "%-15s %-7d %'-14.0f %'-11.0f %'-10.0f %s\n";
 379                 char *fm2_k = "%-15s %-7s %'-14.0f %'-11.0f %'-10.0f %s\n";
 380                 char *e_str = "";
 381
 382                 rec  = &stats_rec->kthread;
 383                 prev = &stats_prev->kthread;
 384                 t = calc_period(rec, prev);
 385                 for (i = 0; i < nr_cpus; i++) {
 386                         struct datarec *r = &rec->cpu[i];
 387                         struct datarec *p = &prev->cpu[i];
 388
 389                         pps  = calc_pps(r, p, t);
 390                         drop = calc_drop_pps(r, p, t);
 391                         err  = calc_errs_pps(r, p, t);
 392                         if (err > 0)
 393                                 e_str = "sched";
 394                         if (pps > 0)
 395                                 printf(fmt_k, "cpumap_kthread",
 396                                        i, pps, drop, err, e_str);
 397                 }
 398                 pps = calc_pps(&rec->total, &prev->total, t);
 399                 drop = calc_drop_pps(&rec->total, &prev->total, t);
 400                 err  = calc_errs_pps(&rec->total, &prev->total, t);
 401                 if (err > 0)
 402                         e_str = "sched-sum";
 403                 printf(fm2_k, "cpumap_kthread", "total", pps, drop, err, e_str);
 404         }
 405
 406         /* XDP redirect err tracepoints (very unlikely) */
 407         {
 408                 char *fmt_err = "%-15s %-7d %'-14.0f %'-11.0f\n";
 409                 char *fm2_err = "%-15s %-7s %'-14.0f %'-11.0f\n";
 410
 411                 rec  = &stats_rec->redir_err;
 412                 prev = &stats_prev->redir_err;
 413                 t = calc_period(rec, prev);
 414                 for (i = 0; i < nr_cpus; i++) {
 415                         struct datarec *r = &rec->cpu[i];
 416                         struct datarec *p = &prev->cpu[i];
 417
 418                         pps  = calc_pps(r, p, t);
 419                         drop = calc_drop_pps(r, p, t);
 420                         if (pps > 0)
 421                                 printf(fmt_err, "redirect_err", i, pps, drop);
 422                 }
 423                 pps = calc_pps(&rec->total, &prev->total, t);
 424                 drop = calc_drop_pps(&rec->total, &prev->total, t);
 425                 printf(fm2_err, "redirect_err", "total", pps, drop);
 426         }
 427
 428         /* XDP general exception tracepoints */
 429         {
 430                 char *fmt_err = "%-15s %-7d %'-14.0f %'-11.0f\n";
 431                 char *fm2_err = "%-15s %-7s %'-14.0f %'-11.0f\n";
 432
 433                 rec  = &stats_rec->exception;
 434                 prev = &stats_prev->exception;
 435                 t = calc_period(rec, prev);
 436                 for (i = 0; i < nr_cpus; i++) {
 437                         struct datarec *r = &rec->cpu[i];
 438                         struct datarec *p = &prev->cpu[i];
 439
 440                         pps  = calc_pps(r, p, t);
 441                         drop = calc_drop_pps(r, p, t);
 442                         if (pps > 0)
 443                                 printf(fmt_err, "xdp_exception", i, pps, drop);
 444                 }
 445                 pps = calc_pps(&rec->total, &prev->total, t);
 446                 drop = calc_drop_pps(&rec->total, &prev->total, t);
 447                 printf(fm2_err, "xdp_exception", "total", pps, drop);
 448         }
 449
 450         printf("\n");
 451         fflush(stdout);
 452 }
 453
 454 static void stats_collect(struct stats_record *rec)
 455 {
 456         int fd, i;
 457
 458         fd = rx_cnt_map_fd;
 459         map_collect_percpu(fd, 0, &rec->rx_cnt);
 460
 461         fd = redirect_err_cnt_map_fd;
 462         map_collect_percpu(fd, 1, &rec->redir_err);
 463
 464         fd = cpumap_enqueue_cnt_map_fd;
 465         for (i = 0; i < MAX_CPUS; i++)
 466                 map_collect_percpu(fd, i, &rec->enq[i]);
 467
 468         fd = cpumap_kthread_cnt_map_fd;
 469         map_collect_percpu(fd, 0, &rec->kthread);
 470
 471         fd = exception_cnt_map_fd;
 472         map_collect_percpu(fd, 0, &rec->exception);
 473 }
 474
 475
 476 /* Pointer swap trick */
 477 static inline void swap(struct stats_record **a, struct stats_record **b)
 478 {
 479         struct stats_record *tmp;
 480
 481         tmp = *a;
 482         *a = *b;
 483         *b = tmp;
 484 }
 485
 486 static int create_cpu_entry(__u32 cpu, __u32 queue_size,
 487                             __u32 avail_idx, bool new)
 488 {
 489         __u32 curr_cpus_count = 0;
 490         __u32 key = 0;
 491         int ret;
 492
 493         /* Add a CPU entry to cpumap, as this allocate a cpu entry in
 494          * the kernel for the cpu.
 495          */
 496         ret = bpf_map_update_elem(cpu_map_fd, &cpu, &queue_size, 0);
 497         if (ret) {
 498                 fprintf(stderr, "Create CPU entry failed (err:%d)\n", ret);
 499                 exit(EXIT_FAIL_BPF);
 500         }
 501
 502         /* Inform bpf_prog's that a new CPU is available to select
 503          * from via some control maps.
 504          */
 505         ret = bpf_map_update_elem(cpus_available_map_fd, &avail_idx, &cpu, 0);
 506         if (ret) {
 507                 fprintf(stderr, "Add to avail CPUs failed\n");
 508                 exit(EXIT_FAIL_BPF);
 509         }
 510
 511         /* When not replacing/updating existing entry, bump the count */
 512         ret = bpf_map_lookup_elem(cpus_count_map_fd, &key, &curr_cpus_count);
 513         if (ret) {
 514                 fprintf(stderr, "Failed reading curr cpus_count\n");
 515                 exit(EXIT_FAIL_BPF);
 516         }
 517         if (new) {
 518                 curr_cpus_count++;
 519                 ret = bpf_map_update_elem(cpus_count_map_fd, &key,
 520                                           &curr_cpus_count, 0);
 521                 if (ret) {
 522                         fprintf(stderr, "Failed write curr cpus_count\n");
 523                         exit(EXIT_FAIL_BPF);
 524                 }
 525         }
 526         /* map_fd[7] = cpus_iterator */
 527         printf("%s CPU:%u as idx:%u queue_size:%d (total cpus_count:%u)\n",
 528                new ? "Add-new":"Replace", cpu, avail_idx,
 529                queue_size, curr_cpus_count);
 530
 531         return 0;
 532 }
 533
 534 /* CPUs are zero-indexed. Thus, add a special sentinel default value
 535  * in map cpus_available to mark CPU index'es not configured
 536  */
 537 static void mark_cpus_unavailable(void)
 538 {
 539         __u32 invalid_cpu = MAX_CPUS;
 540         int ret, i;
 541
 542         for (i = 0; i < MAX_CPUS; i++) {
 543                 ret = bpf_map_update_elem(cpus_available_map_fd, &i,
 544                                           &invalid_cpu, 0);
 545                 if (ret) {
 546                         fprintf(stderr, "Failed marking CPU unavailable\n");
 547                         exit(EXIT_FAIL_BPF);
 548                 }
 549         }
 550 }
 551
 552 /* Stress cpumap management code by concurrently changing underlying cpumap */
 553 static void stress_cpumap(void)
 554 {
 555         /* Changing qsize will cause kernel to free and alloc a new
 556          * bpf_cpu_map_entry, with an associated/complicated tear-down
 557          * procedure.
 558          */
 559         create_cpu_entry(1,  1024, 0, false);
 560         create_cpu_entry(1,     8, 0, false);
 561         create_cpu_entry(1, 16000, 0, false);
 562 }
 563
 564 static void stats_poll(int interval, bool use_separators, char *prog_name,
 565                        bool stress_mode)
 566 {
 567         struct stats_record *record, *prev;
 568
 569         record = alloc_stats_record();
 570         prev   = alloc_stats_record();
 571         stats_collect(record);
 572
 573         /* Trick to pretty printf with thousands separators use %' */
 574         if (use_separators)
 575                 setlocale(LC_NUMERIC, "en_US");
 576
 577         while (1) {
 578                 swap(&prev, &record);
 579                 stats_collect(record);
 580                 stats_print(record, prev, prog_name);
 581                 sleep(interval);
 582                 if (stress_mode)
 583                         stress_cpumap();
 584         }
 585
 586         free_stats_record(record);
 587         free_stats_record(prev);
 588 }
 589
 590 static int init_map_fds(struct bpf_object *obj)
 591 {
 592         cpu_map_fd = bpf_object__find_map_fd_by_name(obj, "cpu_map");
 593         rx_cnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rx_cnt");
 594         redirect_err_cnt_map_fd =
 595                 bpf_object__find_map_fd_by_name(obj, "redirect_err_cnt");
 596         cpumap_enqueue_cnt_map_fd =
 597                 bpf_object__find_map_fd_by_name(obj, "cpumap_enqueue_cnt");
 598         cpumap_kthread_cnt_map_fd =
 599                 bpf_object__find_map_fd_by_name(obj, "cpumap_kthread_cnt");
 600         cpus_available_map_fd =
 601                 bpf_object__find_map_fd_by_name(obj, "cpus_available");
 602         cpus_count_map_fd = bpf_object__find_map_fd_by_name(obj, "cpus_count");
 603         cpus_iterator_map_fd =
 604                 bpf_object__find_map_fd_by_name(obj, "cpus_iterator");
 605         exception_cnt_map_fd =
 606                 bpf_object__find_map_fd_by_name(obj, "exception_cnt");
 607
 608         if (cpu_map_fd < 0 || rx_cnt_map_fd < 0 ||
 609             redirect_err_cnt_map_fd < 0 || cpumap_enqueue_cnt_map_fd < 0 ||
 610             cpumap_kthread_cnt_map_fd < 0 || cpus_available_map_fd < 0 ||
 611             cpus_count_map_fd < 0 || cpus_iterator_map_fd < 0 ||
 612             exception_cnt_map_fd < 0)
 613                 return -ENOENT;
 614
 615         return 0;
 616 }
 617
 618 int main(int argc, char **argv)
 619 {
 620         struct rlimit r = {10 * 1024 * 1024, RLIM_INFINITY};
 621         char *prog_name = "xdp_cpu_map5_lb_hash_ip_pairs";
 622         struct bpf_prog_load_attr prog_load_attr = {
 623                 .prog_type      = BPF_PROG_TYPE_UNSPEC,
 624         };
 625         struct bpf_prog_info info = {};
 626         __u32 info_len = sizeof(info);
 627         bool use_separators = true;
 628         bool stress_mode = false;
 629         struct bpf_program *prog;
 630         struct bpf_object *obj;
 631         char filename[256];
 632         int added_cpus = 0;
 633         int longindex = 0;
 634         int interval = 2;
 635         int add_cpu = -1;
 636         int opt, err;
 637         int prog_fd;
 638         __u32 qsize;
 639
 640         /* Notice: choosing he queue size is very important with the
 641          * ixgbe driver, because it's driver page recycling trick is
 642          * dependend on pages being returned quickly.  The number of
 643          * out-standing packets in the system must be less-than 2x
 644          * RX-ring size.
 645          */
 646         qsize = 128+64;
 647
 648         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
 649         prog_load_attr.file = filename;
 650
 651         if (setrlimit(RLIMIT_MEMLOCK, &r)) {
 652                 perror("setrlimit(RLIMIT_MEMLOCK)");
 653                 return 1;
 654         }
 655
 656         if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
 657                 return EXIT_FAIL;
 658
 659         if (prog_fd < 0) {
 660                 fprintf(stderr, "ERR: bpf_prog_load_xattr: %s\n",
 661                         strerror(errno));
 662                 return EXIT_FAIL;
 663         }
 664         if (init_map_fds(obj) < 0) {
 665                 fprintf(stderr, "bpf_object__find_map_fd_by_name failed\n");
 666                 return EXIT_FAIL;
 667         }
 668         mark_cpus_unavailable();
 669
 670         /* Parse commands line args */
 671         while ((opt = getopt_long(argc, argv, "hSd:s:p:q:c:xzF",
 672                                   long_options, &longindex)) != -1) {
 673                 switch (opt) {
 674                 case 'd':
 675                         if (strlen(optarg) >= IF_NAMESIZE) {
 676                                 fprintf(stderr, "ERR: --dev name too long\n");
 677                                 goto error;
 678                         }
 679                         ifname = (char *)&ifname_buf;
 680                         strncpy(ifname, optarg, IF_NAMESIZE);
 681                         ifindex = if_nametoindex(ifname);
 682                         if (ifindex == 0) {
 683                                 fprintf(stderr,
 684                                         "ERR: --dev name unknown err(%d):%s\n",
 685                                         errno, strerror(errno));
 686                                 goto error;
 687                         }
 688                         break;
 689                 case 's':
 690                         interval = atoi(optarg);
 691                         break;
 692                 case 'S':
 693                         xdp_flags |= XDP_FLAGS_SKB_MODE;
 694                         break;
 695                 case 'x':
 696                         stress_mode = true;
 697                         break;
 698                 case 'z':
 699                         use_separators = false;
 700                         break;
 701                 case 'p':
 702                         /* Selecting eBPF prog to load */
 703                         prog_name = optarg;
 704                         break;
 705                 case 'c':
 706                         /* Add multiple CPUs */
 707                         add_cpu = strtoul(optarg, NULL, 0);
 708                         if (add_cpu >= MAX_CPUS) {
 709                                 fprintf(stderr,
 710                                 "--cpu nr too large for cpumap err(%d):%s\n",
 711                                         errno, strerror(errno));
 712                                 goto error;
 713                         }
 714                         create_cpu_entry(add_cpu, qsize, added_cpus, true);
 715                         added_cpus++;
 716                         break;
 717                 case 'q':
 718                         qsize = atoi(optarg);
 719                         break;
 720                 case 'F':
 721                         xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
 722                         break;
 723                 case 'h':
 724                 error:
 725                 default:
 726                         usage(argv, obj);
 727                         return EXIT_FAIL_OPTION;
 728                 }
 729         }
 730         /* Required option */
 731         if (ifindex == -1) {
 732                 fprintf(stderr, "ERR: required option --dev missing\n");
 733                 usage(argv, obj);
 734                 return EXIT_FAIL_OPTION;
 735         }
 736         /* Required option */
 737         if (add_cpu == -1) {
 738                 fprintf(stderr, "ERR: required option --cpu missing\n");
 739                 fprintf(stderr, " Specify multiple --cpu option to add more\n");
 740                 usage(argv, obj);
 741                 return EXIT_FAIL_OPTION;
 742         }
 743
 744         /* Remove XDP program when program is interrupted or killed */
 745         signal(SIGINT, int_exit);
 746         signal(SIGTERM, int_exit);
 747
 748         prog = bpf_object__find_program_by_title(obj, prog_name);
 749         if (!prog) {
 750                 fprintf(stderr, "bpf_object__find_program_by_title failed\n");
 751                 return EXIT_FAIL;
 752         }
 753
 754         prog_fd = bpf_program__fd(prog);
 755         if (prog_fd < 0) {
 756                 fprintf(stderr, "bpf_program__fd failed\n");
 757                 return EXIT_FAIL;
 758         }
 759
 760         if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
 761                 fprintf(stderr, "link set xdp fd failed\n");
 762                 return EXIT_FAIL_XDP;
 763         }
 764
 765         err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
 766         if (err) {
 767                 printf("can't get prog info - %s\n", strerror(errno));
 768                 return err;
 769         }
 770         prog_id = info.id;
 771
 772         stats_poll(interval, use_separators, prog_name, stress_mode);
 773         return EXIT_OK;
 774 }