samples/bpf/xdp_sample_user.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #define _GNU_SOURCE
   3
   4 #include <arpa/inet.h>
   5 #include <bpf/bpf.h>
   6 #include <bpf/libbpf.h>
   7 #include <errno.h>
   8 #include <fcntl.h>
   9 #include <getopt.h>
  10 #include <linux/ethtool.h>
  11 #include <linux/hashtable.h>
  12 #include <linux/if_link.h>
  13 #include <linux/jhash.h>
  14 #include <linux/limits.h>
  15 #include <linux/list.h>
  16 #include <linux/sockios.h>
  17 #include <locale.h>
  18 #include <math.h>
  19 #include <net/if.h>
  20 #include <poll.h>
  21 #include <signal.h>
  22 #include <stdbool.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/ioctl.h>
  27 #include <sys/mman.h>
  28 #include <sys/signalfd.h>
  29 #include <sys/sysinfo.h>
  30 #include <sys/timerfd.h>
  31 #include <sys/utsname.h>
  32 #include <time.h>
  33 #include <unistd.h>
  34
  35 #include "bpf_util.h"
  36 #include "xdp_sample_user.h"
  37
  38 #define __sample_print(fmt, cond, ...)                                         \
  39         ({                                                                     \
  40                 if (cond)                                                      \
  41                         printf(fmt, ##__VA_ARGS__);                            \
  42         })
  43
  44 #define print_always(fmt, ...) __sample_print(fmt, 1, ##__VA_ARGS__)
  45 #define print_default(fmt, ...)                                                \
  46         __sample_print(fmt, sample_log_level & LL_DEFAULT, ##__VA_ARGS__)
  47 #define __print_err(err, fmt, ...)                                             \
  48         ({                                                                     \
  49                 __sample_print(fmt, err > 0 || sample_log_level & LL_DEFAULT,  \
  50                                ##__VA_ARGS__);                                 \
  51                 sample_err_exp = sample_err_exp ? true : err > 0;              \
  52         })
  53 #define print_err(err, fmt, ...) __print_err(err, fmt, ##__VA_ARGS__)
  54
  55 #define __COLUMN(x) "%'10" x " %-13s"
  56 #define FMT_COLUMNf __COLUMN(".0f")
  57 #define FMT_COLUMNd __COLUMN("d")
  58 #define FMT_COLUMNl __COLUMN("llu")
  59 #define RX(rx) rx, "rx/s"
  60 #define PPS(pps) pps, "pkt/s"
  61 #define DROP(drop) drop, "drop/s"
  62 #define ERR(err) err, "error/s"
  63 #define HITS(hits) hits, "hit/s"
  64 #define XMIT(xmit) xmit, "xmit/s"
  65 #define PASS(pass) pass, "pass/s"
  66 #define REDIR(redir) redir, "redir/s"
  67 #define NANOSEC_PER_SEC 1000000000 /* 10^9 */
  68
  69 #define XDP_UNKNOWN (XDP_REDIRECT + 1)
  70 #define XDP_ACTION_MAX (XDP_UNKNOWN + 1)
  71 #define XDP_REDIRECT_ERR_MAX 7
  72
  73 enum map_type {
  74         MAP_RX,
  75         MAP_REDIRECT_ERR,
  76         MAP_CPUMAP_ENQUEUE,
  77         MAP_CPUMAP_KTHREAD,
  78         MAP_EXCEPTION,
  79         MAP_DEVMAP_XMIT,
  80         MAP_DEVMAP_XMIT_MULTI,
  81         NUM_MAP,
  82 };
  83
  84 enum log_level {
  85         LL_DEFAULT = 1U << 0,
  86         LL_SIMPLE = 1U << 1,
  87         LL_DEBUG = 1U << 2,
  88 };
  89
  90 struct record {
  91         __u64 timestamp;
  92         struct datarec total;
  93         struct datarec *cpu;
  94 };
  95
  96 struct map_entry {
  97         struct hlist_node node;
  98         __u64 pair;
  99         struct record val;
 100 };
 101
 102 struct stats_record {
 103         struct record rx_cnt;
 104         struct record redir_err[XDP_REDIRECT_ERR_MAX];
 105         struct record kthread;
 106         struct record exception[XDP_ACTION_MAX];
 107         struct record devmap_xmit;
 108         DECLARE_HASHTABLE(xmit_map, 5);
 109         struct record enq[];
 110 };
 111
 112 struct sample_output {
 113         struct {
 114                 __u64 rx;
 115                 __u64 redir;
 116                 __u64 drop;
 117                 __u64 drop_xmit;
 118                 __u64 err;
 119                 __u64 xmit;
 120         } totals;
 121         struct {
 122                 union {
 123                         __u64 pps;
 124                         __u64 num;
 125                 };
 126                 __u64 drop;
 127                 __u64 err;
 128         } rx_cnt;
 129         struct {
 130                 __u64 suc;
 131                 __u64 err;
 132         } redir_cnt;
 133         struct {
 134                 __u64 hits;
 135         } except_cnt;
 136         struct {
 137                 __u64 pps;
 138                 __u64 drop;
 139                 __u64 err;
 140                 double bavg;
 141         } xmit_cnt;
 142 };
 143
 144 struct xdp_desc {
 145         int ifindex;
 146         __u32 prog_id;
 147         int flags;
 148 } sample_xdp_progs[32];
 149
 150 struct datarec *sample_mmap[NUM_MAP];
 151 struct bpf_map *sample_map[NUM_MAP];
 152 size_t sample_map_count[NUM_MAP];
 153 enum log_level sample_log_level;
 154 struct sample_output sample_out;
 155 unsigned long sample_interval;
 156 bool sample_err_exp;
 157 int sample_xdp_cnt;
 158 int sample_n_cpus;
 159 int sample_sig_fd;
 160 int sample_mask;
 161
 162 static const char *xdp_redirect_err_names[XDP_REDIRECT_ERR_MAX] = {
 163         /* Key=1 keeps unknown errors */
 164         "Success",
 165         "Unknown",
 166         "EINVAL",
 167         "ENETDOWN",
 168         "EMSGSIZE",
 169         "EOPNOTSUPP",
 170         "ENOSPC",
 171 };
 172
 173 /* Keyed from Unknown */
 174 static const char *xdp_redirect_err_help[XDP_REDIRECT_ERR_MAX - 1] = {
 175         "Unknown error",
 176         "Invalid redirection",
 177         "Device being redirected to is down",
 178         "Packet length too large for device",
 179         "Operation not supported",
 180         "No space in ptr_ring of cpumap kthread",
 181 };
 182
 183 static const char *xdp_action_names[XDP_ACTION_MAX] = {
 184         [XDP_ABORTED]  = "XDP_ABORTED",
 185         [XDP_DROP]     = "XDP_DROP",
 186         [XDP_PASS]     = "XDP_PASS",
 187         [XDP_TX]       = "XDP_TX",
 188         [XDP_REDIRECT] = "XDP_REDIRECT",
 189         [XDP_UNKNOWN]  = "XDP_UNKNOWN",
 190 };
 191
 192 static __u64 gettime(void)
 193 {
 194         struct timespec t;
 195         int res;
 196
 197         res = clock_gettime(CLOCK_MONOTONIC, &t);
 198         if (res < 0) {
 199                 fprintf(stderr, "Error with gettimeofday! (%i)\n", res);
 200                 return UINT64_MAX;
 201         }
 202         return (__u64)t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
 203 }
 204
 205 static const char *action2str(int action)
 206 {
 207         if (action < XDP_ACTION_MAX)
 208                 return xdp_action_names[action];
 209         return NULL;
 210 }
 211
 212 static void sample_print_help(int mask)
 213 {
 214         printf("Output format description\n\n"
 215                "By default, redirect success statistics are disabled, use -s to enable.\n"
 216                "The terse output mode is default, verbose mode can be activated using -v\n"
 217                "Use SIGQUIT (Ctrl + \\) to switch the mode dynamically at runtime\n\n"
 218                "Terse mode displays at most the following fields:\n"
 219                "  rx/s        Number of packets received per second\n"
 220                "  redir/s     Number of packets successfully redirected per second\n"
 221                "  err,drop/s  Aggregated count of errors per second (including dropped packets)\n"
 222                "  xmit/s      Number of packets transmitted on the output device per second\n\n"
 223                "Output description for verbose mode:\n"
 224                "  FIELD                 DESCRIPTION\n");
 225
 226         if (mask & SAMPLE_RX_CNT) {
 227                 printf("  receive\t\tDisplays the number of packets received & errors encountered\n"
 228                        " \t\t\tWhenever an error or packet drop occurs, details of per CPU error\n"
 229                        " \t\t\tand drop statistics will be expanded inline in terse mode.\n"
 230                        " \t\t\t\tpkt/s     - Packets received per second\n"
 231                        " \t\t\t\tdrop/s    - Packets dropped per second\n"
 232                        " \t\t\t\terror/s   - Errors encountered per second\n\n");
 233         }
 234         if (mask & (SAMPLE_REDIRECT_CNT | SAMPLE_REDIRECT_ERR_CNT)) {
 235                 printf("  redirect\t\tDisplays the number of packets successfully redirected\n"
 236                        "  \t\t\tErrors encountered are expanded under redirect_err field\n"
 237                        "  \t\t\tNote that passing -s to enable it has a per packet overhead\n"
 238                        "  \t\t\t\tredir/s   - Packets redirected successfully per second\n\n"
 239                        "  redirect_err\t\tDisplays the number of packets that failed redirection\n"
 240                        "  \t\t\tThe errno is expanded under this field with per CPU count\n"
 241                        "  \t\t\tThe recognized errors are:\n");
 242
 243                 for (int i = 2; i < XDP_REDIRECT_ERR_MAX; i++)
 244                         printf("\t\t\t  %s: %s\n", xdp_redirect_err_names[i],
 245                                xdp_redirect_err_help[i - 1]);
 246
 247                 printf("  \n\t\t\t\terror/s   - Packets that failed redirection per second\n\n");
 248         }
 249
 250         if (mask & SAMPLE_CPUMAP_ENQUEUE_CNT) {
 251                 printf("  enqueue to cpu N\tDisplays the number of packets enqueued to bulk queue of CPU N\n"
 252                        "  \t\t\tExpands to cpu:FROM->N to display enqueue stats for each CPU enqueuing to CPU N\n"
 253                        "  \t\t\tReceived packets can be associated with the CPU redirect program is enqueuing \n"
 254                        "  \t\t\tpackets to.\n"
 255                        "  \t\t\t\tpkt/s    - Packets enqueued per second from other CPU to CPU N\n"
 256                        "  \t\t\t\tdrop/s   - Packets dropped when trying to enqueue to CPU N\n"
 257                        "  \t\t\t\tbulk-avg - Average number of packets processed for each event\n\n");
 258         }
 259
 260         if (mask & SAMPLE_CPUMAP_KTHREAD_CNT) {
 261                 printf("  kthread\t\tDisplays the number of packets processed in CPUMAP kthread for each CPU\n"
 262                        "  \t\t\tPackets consumed from ptr_ring in kthread, and its xdp_stats (after calling \n"
 263                        "  \t\t\tCPUMAP bpf prog) are expanded below this. xdp_stats are expanded as a total and\n"
 264                        "  \t\t\tthen per-CPU to associate it to each CPU's pinned CPUMAP kthread.\n"
 265                        "  \t\t\t\tpkt/s    - Packets consumed per second from ptr_ring\n"
 266                        "  \t\t\t\tdrop/s   - Packets dropped per second in kthread\n"
 267                        "  \t\t\t\tsched    - Number of times kthread called schedule()\n\n"
 268                        "  \t\t\txdp_stats (also expands to per-CPU counts)\n"
 269                        "  \t\t\t\tpass/s  - XDP_PASS count for CPUMAP program execution\n"
 270                        "  \t\t\t\tdrop/s  - XDP_DROP count for CPUMAP program execution\n"
 271                        "  \t\t\t\tredir/s - XDP_REDIRECT count for CPUMAP program execution\n\n");
 272         }
 273
 274         if (mask & SAMPLE_EXCEPTION_CNT) {
 275                 printf("  xdp_exception\t\tDisplays xdp_exception tracepoint events\n"
 276                        "  \t\t\tThis can occur due to internal driver errors, unrecognized\n"
 277                        "  \t\t\tXDP actions and due to explicit user trigger by use of XDP_ABORTED\n"
 278                        "  \t\t\tEach action is expanded below this field with its count\n"
 279                        "  \t\t\t\thit/s     - Number of times the tracepoint was hit per second\n\n");
 280         }
 281
 282         if (mask & SAMPLE_DEVMAP_XMIT_CNT) {
 283                 printf("  devmap_xmit\t\tDisplays devmap_xmit tracepoint events\n"
 284                        "  \t\t\tThis tracepoint is invoked for successful transmissions on output\n"
 285                        "  \t\t\tdevice but these statistics are not available for generic XDP mode,\n"
 286                        "  \t\t\thence they will be omitted from the output when using SKB mode\n"
 287                        "  \t\t\t\txmit/s    - Number of packets that were transmitted per second\n"
 288                        "  \t\t\t\tdrop/s    - Number of packets that failed transmissions per second\n"
 289                        "  \t\t\t\tdrv_err/s - Number of internal driver errors per second\n"
 290                        "  \t\t\t\tbulk-avg  - Average number of packets processed for each event\n\n");
 291         }
 292 }
 293
 294 void sample_usage(char *argv[], const struct option *long_options,
 295                   const char *doc, int mask, bool error)
 296 {
 297         int i;
 298
 299         if (!error)
 300                 sample_print_help(mask);
 301
 302         printf("\n%s\nOption for %s:\n", doc, argv[0]);
 303         for (i = 0; long_options[i].name != 0; i++) {
 304                 printf(" --%-15s", long_options[i].name);
 305                 if (long_options[i].flag != NULL)
 306                         printf(" flag (internal value: %d)",
 307                                *long_options[i].flag);
 308                 else
 309                         printf("\t short-option: -%c", long_options[i].val);
 310                 printf("\n");
 311         }
 312         printf("\n");
 313 }
 314
 315 static struct datarec *alloc_record_per_cpu(void)
 316 {
 317         unsigned int nr_cpus = libbpf_num_possible_cpus();
 318         struct datarec *array;
 319
 320         array = calloc(nr_cpus, sizeof(*array));
 321         if (!array) {
 322                 fprintf(stderr, "Failed to allocate memory (nr_cpus: %u)\n",
 323                         nr_cpus);
 324                 return NULL;
 325         }
 326         return array;
 327 }
 328
 329 static int map_entry_init(struct map_entry *e, __u64 pair)
 330 {
 331         e->pair = pair;
 332         INIT_HLIST_NODE(&e->node);
 333         e->val.timestamp = gettime();
 334         e->val.cpu = alloc_record_per_cpu();
 335         if (!e->val.cpu)
 336                 return -ENOMEM;
 337         return 0;
 338 }
 339
 340 static void map_collect_percpu(struct datarec *values, struct record *rec)
 341 {
 342         /* For percpu maps, userspace gets a value per possible CPU */
 343         unsigned int nr_cpus = libbpf_num_possible_cpus();
 344         __u64 sum_xdp_redirect = 0;
 345         __u64 sum_processed = 0;
 346         __u64 sum_xdp_pass = 0;
 347         __u64 sum_xdp_drop = 0;
 348         __u64 sum_dropped = 0;
 349         __u64 sum_issue = 0;
 350         int i;
 351
 352         /* Get time as close as possible to reading map contents */
 353         rec->timestamp = gettime();
 354
 355         /* Record and sum values from each CPU */
 356         for (i = 0; i < nr_cpus; i++) {
 357                 rec->cpu[i].processed = READ_ONCE(values[i].processed);
 358                 rec->cpu[i].dropped = READ_ONCE(values[i].dropped);
 359                 rec->cpu[i].issue = READ_ONCE(values[i].issue);
 360                 rec->cpu[i].xdp_pass = READ_ONCE(values[i].xdp_pass);
 361                 rec->cpu[i].xdp_drop = READ_ONCE(values[i].xdp_drop);
 362                 rec->cpu[i].xdp_redirect = READ_ONCE(values[i].xdp_redirect);
 363
 364                 sum_processed += rec->cpu[i].processed;
 365                 sum_dropped += rec->cpu[i].dropped;
 366                 sum_issue += rec->cpu[i].issue;
 367                 sum_xdp_pass += rec->cpu[i].xdp_pass;
 368                 sum_xdp_drop += rec->cpu[i].xdp_drop;
 369                 sum_xdp_redirect += rec->cpu[i].xdp_redirect;
 370         }
 371
 372         rec->total.processed = sum_processed;
 373         rec->total.dropped = sum_dropped;
 374         rec->total.issue = sum_issue;
 375         rec->total.xdp_pass = sum_xdp_pass;
 376         rec->total.xdp_drop = sum_xdp_drop;
 377         rec->total.xdp_redirect = sum_xdp_redirect;
 378 }
 379
 380 static int map_collect_percpu_devmap(int map_fd, struct stats_record *rec)
 381 {
 382         unsigned int nr_cpus = bpf_num_possible_cpus();
 383         __u32 batch, count = 32;
 384         struct datarec *values;
 385         bool init = false;
 386         __u64 *keys;
 387         int i, ret;
 388
 389         keys = calloc(count, sizeof(__u64));
 390         if (!keys)
 391                 return -ENOMEM;
 392         values = calloc(count * nr_cpus, sizeof(struct datarec));
 393         if (!values) {
 394                 free(keys);
 395                 return -ENOMEM;
 396         }
 397
 398         for (;;) {
 399                 bool exit = false;
 400
 401                 ret = bpf_map_lookup_batch(map_fd, init ? &batch : NULL, &batch,
 402                                            keys, values, &count, NULL);
 403                 if (ret < 0 && errno != ENOENT)
 404                         break;
 405                 if (errno == ENOENT)
 406                         exit = true;
 407
 408                 init = true;
 409                 for (i = 0; i < count; i++) {
 410                         struct map_entry *e, *x = NULL;
 411                         __u64 pair = keys[i];
 412                         struct datarec *arr;
 413
 414                         arr = &values[i * nr_cpus];
 415                         hash_for_each_possible(rec->xmit_map, e, node, pair) {
 416                                 if (e->pair == pair) {
 417                                         x = e;
 418                                         break;
 419                                 }
 420                         }
 421                         if (!x) {
 422                                 x = calloc(1, sizeof(*x));
 423                                 if (!x)
 424                                         goto cleanup;
 425                                 if (map_entry_init(x, pair) < 0) {
 426                                         free(x);
 427                                         goto cleanup;
 428                                 }
 429                                 hash_add(rec->xmit_map, &x->node, pair);
 430                         }
 431                         map_collect_percpu(arr, &x->val);
 432                 }
 433
 434                 if (exit)
 435                         break;
 436                 count = 32;
 437         }
 438
 439         free(values);
 440         free(keys);
 441         return 0;
 442 cleanup:
 443         free(values);
 444         free(keys);
 445         return -ENOMEM;
 446 }
 447
 448 static struct stats_record *alloc_stats_record(void)
 449 {
 450         struct stats_record *rec;
 451         int i;
 452
 453         rec = calloc(1, sizeof(*rec) + sample_n_cpus * sizeof(struct record));
 454         if (!rec) {
 455                 fprintf(stderr, "Failed to allocate memory\n");
 456                 return NULL;
 457         }
 458
 459         if (sample_mask & SAMPLE_RX_CNT) {
 460                 rec->rx_cnt.cpu = alloc_record_per_cpu();
 461                 if (!rec->rx_cnt.cpu) {
 462                         fprintf(stderr,
 463                                 "Failed to allocate rx_cnt per-CPU array\n");
 464                         goto end_rec;
 465                 }
 466         }
 467         if (sample_mask & (SAMPLE_REDIRECT_CNT | SAMPLE_REDIRECT_ERR_CNT)) {
 468                 for (i = 0; i < XDP_REDIRECT_ERR_MAX; i++) {
 469                         rec->redir_err[i].cpu = alloc_record_per_cpu();
 470                         if (!rec->redir_err[i].cpu) {
 471                                 fprintf(stderr,
 472                                         "Failed to allocate redir_err per-CPU array for "
 473                                         "\"%s\" case\n",
 474                                         xdp_redirect_err_names[i]);
 475                                 while (i--)
 476                                         free(rec->redir_err[i].cpu);
 477                                 goto end_rx_cnt;
 478                         }
 479                 }
 480         }
 481         if (sample_mask & SAMPLE_CPUMAP_KTHREAD_CNT) {
 482                 rec->kthread.cpu = alloc_record_per_cpu();
 483                 if (!rec->kthread.cpu) {
 484                         fprintf(stderr,
 485                                 "Failed to allocate kthread per-CPU array\n");
 486                         goto end_redir;
 487                 }
 488         }
 489         if (sample_mask & SAMPLE_EXCEPTION_CNT) {
 490                 for (i = 0; i < XDP_ACTION_MAX; i++) {
 491                         rec->exception[i].cpu = alloc_record_per_cpu();
 492                         if (!rec->exception[i].cpu) {
 493                                 fprintf(stderr,
 494                                         "Failed to allocate exception per-CPU array for "
 495                                         "\"%s\" case\n",
 496                                         action2str(i));
 497                                 while (i--)
 498                                         free(rec->exception[i].cpu);
 499                                 goto end_kthread;
 500                         }
 501                 }
 502         }
 503         if (sample_mask & SAMPLE_DEVMAP_XMIT_CNT) {
 504                 rec->devmap_xmit.cpu = alloc_record_per_cpu();
 505                 if (!rec->devmap_xmit.cpu) {
 506                         fprintf(stderr,
 507                                 "Failed to allocate devmap_xmit per-CPU array\n");
 508                         goto end_exception;
 509                 }
 510         }
 511         if (sample_mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI)
 512                 hash_init(rec->xmit_map);
 513         if (sample_mask & SAMPLE_CPUMAP_ENQUEUE_CNT) {
 514                 for (i = 0; i < sample_n_cpus; i++) {
 515                         rec->enq[i].cpu = alloc_record_per_cpu();
 516                         if (!rec->enq[i].cpu) {
 517                                 fprintf(stderr,
 518                                         "Failed to allocate enqueue per-CPU array for "
 519                                         "CPU %d\n",
 520                                         i);
 521                                 while (i--)
 522                                         free(rec->enq[i].cpu);
 523                                 goto end_devmap_xmit;
 524                         }
 525                 }
 526         }
 527
 528         return rec;
 529
 530 end_devmap_xmit:
 531         free(rec->devmap_xmit.cpu);
 532 end_exception:
 533         for (i = 0; i < XDP_ACTION_MAX; i++)
 534                 free(rec->exception[i].cpu);
 535 end_kthread:
 536         free(rec->kthread.cpu);
 537 end_redir:
 538         for (i = 0; i < XDP_REDIRECT_ERR_MAX; i++)
 539                 free(rec->redir_err[i].cpu);
 540 end_rx_cnt:
 541         free(rec->rx_cnt.cpu);
 542 end_rec:
 543         free(rec);
 544         return NULL;
 545 }
 546
 547 static void free_stats_record(struct stats_record *r)
 548 {
 549         struct hlist_node *tmp;
 550         struct map_entry *e;
 551         int i;
 552
 553         for (i = 0; i < sample_n_cpus; i++)
 554                 free(r->enq[i].cpu);
 555         hash_for_each_safe(r->xmit_map, i, tmp, e, node) {
 556                 hash_del(&e->node);
 557                 free(e->val.cpu);
 558                 free(e);
 559         }
 560         free(r->devmap_xmit.cpu);
 561         for (i = 0; i < XDP_ACTION_MAX; i++)
 562                 free(r->exception[i].cpu);
 563         free(r->kthread.cpu);
 564         for (i = 0; i < XDP_REDIRECT_ERR_MAX; i++)
 565                 free(r->redir_err[i].cpu);
 566         free(r->rx_cnt.cpu);
 567         free(r);
 568 }
 569
 570 static double calc_period(struct record *r, struct record *p)
 571 {
 572         double period_ = 0;
 573         __u64 period = 0;
 574
 575         period = r->timestamp - p->timestamp;
 576         if (period > 0)
 577                 period_ = ((double)period / NANOSEC_PER_SEC);
 578
 579         return period_;
 580 }
 581
 582 static double sample_round(double val)
 583 {
 584         if (val - floor(val) < 0.5)
 585                 return floor(val);
 586         return ceil(val);
 587 }
 588
 589 static __u64 calc_pps(struct datarec *r, struct datarec *p, double period_)
 590 {
 591         __u64 packets = 0;
 592         __u64 pps = 0;
 593
 594         if (period_ > 0) {
 595                 packets = r->processed - p->processed;
 596                 pps = sample_round(packets / period_);
 597         }
 598         return pps;
 599 }
 600
 601 static __u64 calc_drop_pps(struct datarec *r, struct datarec *p, double period_)
 602 {
 603         __u64 packets = 0;
 604         __u64 pps = 0;
 605
 606         if (period_ > 0) {
 607                 packets = r->dropped - p->dropped;
 608                 pps = sample_round(packets / period_);
 609         }
 610         return pps;
 611 }
 612
 613 static __u64 calc_errs_pps(struct datarec *r, struct datarec *p, double period_)
 614 {
 615         __u64 packets = 0;
 616         __u64 pps = 0;
 617
 618         if (period_ > 0) {
 619                 packets = r->issue - p->issue;
 620                 pps = sample_round(packets / period_);
 621         }
 622         return pps;
 623 }
 624
 625 static __u64 calc_info_pps(struct datarec *r, struct datarec *p, double period_)
 626 {
 627         __u64 packets = 0;
 628         __u64 pps = 0;
 629
 630         if (period_ > 0) {
 631                 packets = r->info - p->info;
 632                 pps = sample_round(packets / period_);
 633         }
 634         return pps;
 635 }
 636
 637 static void calc_xdp_pps(struct datarec *r, struct datarec *p, double *xdp_pass,
 638                          double *xdp_drop, double *xdp_redirect, double period_)
 639 {
 640         *xdp_pass = 0, *xdp_drop = 0, *xdp_redirect = 0;
 641         if (period_ > 0) {
 642                 *xdp_redirect = (r->xdp_redirect - p->xdp_redirect) / period_;
 643                 *xdp_pass = (r->xdp_pass - p->xdp_pass) / period_;
 644                 *xdp_drop = (r->xdp_drop - p->xdp_drop) / period_;
 645         }
 646 }
 647
 648 static void stats_get_rx_cnt(struct stats_record *stats_rec,
 649                              struct stats_record *stats_prev,
 650                              unsigned int nr_cpus, struct sample_output *out)
 651 {
 652         struct record *rec, *prev;
 653         double t, pps, drop, err;
 654         int i;
 655
 656         rec = &stats_rec->rx_cnt;
 657         prev = &stats_prev->rx_cnt;
 658         t = calc_period(rec, prev);
 659
 660         for (i = 0; i < nr_cpus; i++) {
 661                 struct datarec *r = &rec->cpu[i];
 662                 struct datarec *p = &prev->cpu[i];
 663                 char str[64];
 664
 665                 pps = calc_pps(r, p, t);
 666                 drop = calc_drop_pps(r, p, t);
 667                 err = calc_errs_pps(r, p, t);
 668                 if (!pps && !drop && !err)
 669                         continue;
 670
 671                 snprintf(str, sizeof(str), "cpu:%d", i);
 672                 print_default("    %-18s " FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf
 673                               "\n",
 674                               str, PPS(pps), DROP(drop), ERR(err));
 675         }
 676
 677         if (out) {
 678                 pps = calc_pps(&rec->total, &prev->total, t);
 679                 drop = calc_drop_pps(&rec->total, &prev->total, t);
 680                 err = calc_errs_pps(&rec->total, &prev->total, t);
 681
 682                 out->rx_cnt.pps = pps;
 683                 out->rx_cnt.drop = drop;
 684                 out->rx_cnt.err = err;
 685                 out->totals.rx += pps;
 686                 out->totals.drop += drop;
 687                 out->totals.err += err;
 688         }
 689 }
 690
 691 static void stats_get_cpumap_enqueue(struct stats_record *stats_rec,
 692                                      struct stats_record *stats_prev,
 693                                      unsigned int nr_cpus)
 694 {
 695         struct record *rec, *prev;
 696         double t, pps, drop, err;
 697         int i, to_cpu;
 698
 699         /* cpumap enqueue stats */
 700         for (to_cpu = 0; to_cpu < sample_n_cpus; to_cpu++) {
 701                 rec = &stats_rec->enq[to_cpu];
 702                 prev = &stats_prev->enq[to_cpu];
 703                 t = calc_period(rec, prev);
 704
 705                 pps = calc_pps(&rec->total, &prev->total, t);
 706                 drop = calc_drop_pps(&rec->total, &prev->total, t);
 707                 err = calc_errs_pps(&rec->total, &prev->total, t);
 708
 709                 if (pps > 0 || drop > 0) {
 710                         char str[64];
 711
 712                         snprintf(str, sizeof(str), "enqueue to cpu %d", to_cpu);
 713
 714                         if (err > 0)
 715                                 err = pps / err; /* calc average bulk size */
 716
 717                         print_err(drop,
 718                                   "  %-20s " FMT_COLUMNf FMT_COLUMNf __COLUMN(
 719                                           ".2f") "\n",
 720                                   str, PPS(pps), DROP(drop), err, "bulk-avg");
 721                 }
 722
 723                 for (i = 0; i < nr_cpus; i++) {
 724                         struct datarec *r = &rec->cpu[i];
 725                         struct datarec *p = &prev->cpu[i];
 726                         char str[64];
 727
 728                         pps = calc_pps(r, p, t);
 729                         drop = calc_drop_pps(r, p, t);
 730                         err = calc_errs_pps(r, p, t);
 731                         if (!pps && !drop && !err)
 732                                 continue;
 733
 734                         snprintf(str, sizeof(str), "cpu:%d->%d", i, to_cpu);
 735                         if (err > 0)
 736                                 err = pps / err; /* calc average bulk size */
 737                         print_default(
 738                                 "    %-18s " FMT_COLUMNf FMT_COLUMNf __COLUMN(
 739                                         ".2f") "\n",
 740                                 str, PPS(pps), DROP(drop), err, "bulk-avg");
 741                 }
 742         }
 743 }
 744
 745 static void stats_get_cpumap_remote(struct stats_record *stats_rec,
 746                                     struct stats_record *stats_prev,
 747                                     unsigned int nr_cpus)
 748 {
 749         double xdp_pass, xdp_drop, xdp_redirect;
 750         struct record *rec, *prev;
 751         double t;
 752         int i;
 753
 754         rec = &stats_rec->kthread;
 755         prev = &stats_prev->kthread;
 756         t = calc_period(rec, prev);
 757
 758         calc_xdp_pps(&rec->total, &prev->total, &xdp_pass, &xdp_drop,
 759                      &xdp_redirect, t);
 760         if (xdp_pass || xdp_drop || xdp_redirect) {
 761                 print_err(xdp_drop,
 762                           "    %-18s " FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf "\n",
 763                           "xdp_stats", PASS(xdp_pass), DROP(xdp_drop),
 764                           REDIR(xdp_redirect));
 765         }
 766
 767         for (i = 0; i < nr_cpus; i++) {
 768                 struct datarec *r = &rec->cpu[i];
 769                 struct datarec *p = &prev->cpu[i];
 770                 char str[64];
 771
 772                 calc_xdp_pps(r, p, &xdp_pass, &xdp_drop, &xdp_redirect, t);
 773                 if (!xdp_pass && !xdp_drop && !xdp_redirect)
 774                         continue;
 775
 776                 snprintf(str, sizeof(str), "cpu:%d", i);
 777                 print_default("      %-16s " FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf
 778                               "\n",
 779                               str, PASS(xdp_pass), DROP(xdp_drop),
 780                               REDIR(xdp_redirect));
 781         }
 782 }
 783
 784 static void stats_get_cpumap_kthread(struct stats_record *stats_rec,
 785                                      struct stats_record *stats_prev,
 786                                      unsigned int nr_cpus)
 787 {
 788         struct record *rec, *prev;
 789         double t, pps, drop, err;
 790         int i;
 791
 792         rec = &stats_rec->kthread;
 793         prev = &stats_prev->kthread;
 794         t = calc_period(rec, prev);
 795
 796         pps = calc_pps(&rec->total, &prev->total, t);
 797         drop = calc_drop_pps(&rec->total, &prev->total, t);
 798         err = calc_errs_pps(&rec->total, &prev->total, t);
 799
 800         print_err(drop, "  %-20s " FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf "\n",
 801                   pps ? "kthread total" : "kthread", PPS(pps), DROP(drop), err,
 802                   "sched");
 803
 804         for (i = 0; i < nr_cpus; i++) {
 805                 struct datarec *r = &rec->cpu[i];
 806                 struct datarec *p = &prev->cpu[i];
 807                 char str[64];
 808
 809                 pps = calc_pps(r, p, t);
 810                 drop = calc_drop_pps(r, p, t);
 811                 err = calc_errs_pps(r, p, t);
 812                 if (!pps && !drop && !err)
 813                         continue;
 814
 815                 snprintf(str, sizeof(str), "cpu:%d", i);
 816                 print_default("    %-18s " FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf
 817                               "\n",
 818                               str, PPS(pps), DROP(drop), err, "sched");
 819         }
 820 }
 821
 822 static void stats_get_redirect_cnt(struct stats_record *stats_rec,
 823                                    struct stats_record *stats_prev,
 824                                    unsigned int nr_cpus,
 825                                    struct sample_output *out)
 826 {
 827         struct record *rec, *prev;
 828         double t, pps;
 829         int i;
 830
 831         rec = &stats_rec->redir_err[0];
 832         prev = &stats_prev->redir_err[0];
 833         t = calc_period(rec, prev);
 834         for (i = 0; i < nr_cpus; i++) {
 835                 struct datarec *r = &rec->cpu[i];
 836                 struct datarec *p = &prev->cpu[i];
 837                 char str[64];
 838
 839                 pps = calc_pps(r, p, t);
 840                 if (!pps)
 841                         continue;
 842
 843                 snprintf(str, sizeof(str), "cpu:%d", i);
 844                 print_default("    %-18s " FMT_COLUMNf "\n", str, REDIR(pps));
 845         }
 846
 847         if (out) {
 848                 pps = calc_pps(&rec->total, &prev->total, t);
 849                 out->redir_cnt.suc = pps;
 850                 out->totals.redir += pps;
 851         }
 852 }
 853
 854 static void stats_get_redirect_err_cnt(struct stats_record *stats_rec,
 855                                        struct stats_record *stats_prev,
 856                                        unsigned int nr_cpus,
 857                                        struct sample_output *out)
 858 {
 859         struct record *rec, *prev;
 860         double t, drop, sum = 0;
 861         int rec_i, i;
 862
 863         for (rec_i = 1; rec_i < XDP_REDIRECT_ERR_MAX; rec_i++) {
 864                 char str[64];
 865
 866                 rec = &stats_rec->redir_err[rec_i];
 867                 prev = &stats_prev->redir_err[rec_i];
 868                 t = calc_period(rec, prev);
 869
 870                 drop = calc_drop_pps(&rec->total, &prev->total, t);
 871                 if (drop > 0 && !out) {
 872                         snprintf(str, sizeof(str),
 873                                  sample_log_level & LL_DEFAULT ? "%s total" :
 874                                                                        "%s",
 875                                  xdp_redirect_err_names[rec_i]);
 876                         print_err(drop, "    %-18s " FMT_COLUMNf "\n", str,
 877                                   ERR(drop));
 878                 }
 879
 880                 for (i = 0; i < nr_cpus; i++) {
 881                         struct datarec *r = &rec->cpu[i];
 882                         struct datarec *p = &prev->cpu[i];
 883                         double drop;
 884
 885                         drop = calc_drop_pps(r, p, t);
 886                         if (!drop)
 887                                 continue;
 888
 889                         snprintf(str, sizeof(str), "cpu:%d", i);
 890                         print_default("       %-16s" FMT_COLUMNf "\n", str,
 891                                       ERR(drop));
 892                 }
 893
 894                 sum += drop;
 895         }
 896
 897         if (out) {
 898                 out->redir_cnt.err = sum;
 899                 out->totals.err += sum;
 900         }
 901 }
 902
 903 static void stats_get_exception_cnt(struct stats_record *stats_rec,
 904                                     struct stats_record *stats_prev,
 905                                     unsigned int nr_cpus,
 906                                     struct sample_output *out)
 907 {
 908         double t, drop, sum = 0;
 909         struct record *rec, *prev;
 910         int rec_i, i;
 911
 912         for (rec_i = 0; rec_i < XDP_ACTION_MAX; rec_i++) {
 913                 rec = &stats_rec->exception[rec_i];
 914                 prev = &stats_prev->exception[rec_i];
 915                 t = calc_period(rec, prev);
 916
 917                 drop = calc_drop_pps(&rec->total, &prev->total, t);
 918                 /* Fold out errors after heading */
 919                 sum += drop;
 920
 921                 if (drop > 0 && !out) {
 922                         print_always("    %-18s " FMT_COLUMNf "\n",
 923                                      action2str(rec_i), ERR(drop));
 924
 925                         for (i = 0; i < nr_cpus; i++) {
 926                                 struct datarec *r = &rec->cpu[i];
 927                                 struct datarec *p = &prev->cpu[i];
 928                                 char str[64];
 929                                 double drop;
 930
 931                                 drop = calc_drop_pps(r, p, t);
 932                                 if (!drop)
 933                                         continue;
 934
 935                                 snprintf(str, sizeof(str), "cpu:%d", i);
 936                                 print_default("       %-16s" FMT_COLUMNf "\n",
 937                                               str, ERR(drop));
 938                         }
 939                 }
 940         }
 941
 942         if (out) {
 943                 out->except_cnt.hits = sum;
 944                 out->totals.err += sum;
 945         }
 946 }
 947
 948 static void stats_get_devmap_xmit(struct stats_record *stats_rec,
 949                                   struct stats_record *stats_prev,
 950                                   unsigned int nr_cpus,
 951                                   struct sample_output *out)
 952 {
 953         double pps, drop, info, err;
 954         struct record *rec, *prev;
 955         double t;
 956         int i;
 957
 958         rec = &stats_rec->devmap_xmit;
 959         prev = &stats_prev->devmap_xmit;
 960         t = calc_period(rec, prev);
 961         for (i = 0; i < nr_cpus; i++) {
 962                 struct datarec *r = &rec->cpu[i];
 963                 struct datarec *p = &prev->cpu[i];
 964                 char str[64];
 965
 966                 pps = calc_pps(r, p, t);
 967                 drop = calc_drop_pps(r, p, t);
 968                 err = calc_errs_pps(r, p, t);
 969
 970                 if (!pps && !drop && !err)
 971                         continue;
 972
 973                 snprintf(str, sizeof(str), "cpu:%d", i);
 974                 info = calc_info_pps(r, p, t);
 975                 if (info > 0)
 976                         info = (pps + drop) / info; /* calc avg bulk */
 977                 print_default("     %-18s" FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf
 978                                       __COLUMN(".2f") "\n",
 979                               str, XMIT(pps), DROP(drop), err, "drv_err/s",
 980                               info, "bulk-avg");
 981         }
 982         if (out) {
 983                 pps = calc_pps(&rec->total, &prev->total, t);
 984                 drop = calc_drop_pps(&rec->total, &prev->total, t);
 985                 info = calc_info_pps(&rec->total, &prev->total, t);
 986                 if (info > 0)
 987                         info = (pps + drop) / info; /* calc avg bulk */
 988                 err = calc_errs_pps(&rec->total, &prev->total, t);
 989
 990                 out->xmit_cnt.pps = pps;
 991                 out->xmit_cnt.drop = drop;
 992                 out->xmit_cnt.bavg = info;
 993                 out->xmit_cnt.err = err;
 994                 out->totals.xmit += pps;
 995                 out->totals.drop_xmit += drop;
 996                 out->totals.err += err;
 997         }
 998 }
 999
1000 static void stats_get_devmap_xmit_multi(struct stats_record *stats_rec,
1001                                         struct stats_record *stats_prev,
1002                                         unsigned int nr_cpus,
1003                                         struct sample_output *out,
1004                                         bool xmit_total)
1005 {
1006         double pps, drop, info, err;
1007         struct map_entry *entry;
1008         struct record *r, *p;
1009         double t;
1010         int bkt;
1011
1012         hash_for_each(stats_rec->xmit_map, bkt, entry, node) {
1013                 struct map_entry *e, *x = NULL;
1014                 char ifname_from[IFNAMSIZ];
1015                 char ifname_to[IFNAMSIZ];
1016                 const char *fstr, *tstr;
1017                 unsigned long prev_time;
1018                 struct record beg = {};
1019                 __u32 from_idx, to_idx;
1020                 char str[128];
1021                 __u64 pair;
1022                 int i;
1023
1024                 prev_time = sample_interval * NANOSEC_PER_SEC;
1025
1026                 pair = entry->pair;
1027                 from_idx = pair >> 32;
1028                 to_idx = pair & 0xFFFFFFFF;
1029
1030                 r = &entry->val;
1031                 beg.timestamp = r->timestamp - prev_time;
1032
1033                 /* Find matching entry from stats_prev map */
1034                 hash_for_each_possible(stats_prev->xmit_map, e, node, pair) {
1035                         if (e->pair == pair) {
1036                                 x = e;
1037                                 break;
1038                         }
1039                 }
1040                 if (x)
1041                         p = &x->val;
1042                 else
1043                         p = &beg;
1044                 t = calc_period(r, p);
1045                 pps = calc_pps(&r->total, &p->total, t);
1046                 drop = calc_drop_pps(&r->total, &p->total, t);
1047                 info = calc_info_pps(&r->total, &p->total, t);
1048                 if (info > 0)
1049                         info = (pps + drop) / info; /* calc avg bulk */
1050                 err = calc_errs_pps(&r->total, &p->total, t);
1051
1052                 if (out) {
1053                         /* We are responsible for filling out totals */
1054                         out->totals.xmit += pps;
1055                         out->totals.drop_xmit += drop;
1056                         out->totals.err += err;
1057                         continue;
1058                 }
1059
1060                 fstr = tstr = NULL;
1061                 if (if_indextoname(from_idx, ifname_from))
1062                         fstr = ifname_from;
1063                 if (if_indextoname(to_idx, ifname_to))
1064                         tstr = ifname_to;
1065
1066                 snprintf(str, sizeof(str), "xmit %s->%s", fstr ?: "?",
1067                          tstr ?: "?");
1068                 /* Skip idle streams of redirection */
1069                 if (pps || drop || err) {
1070                         print_err(drop,
1071                                   "  %-20s " FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf
1072                                   __COLUMN(".2f") "\n", str, XMIT(pps), DROP(drop),
1073                                   err, "drv_err/s", info, "bulk-avg");
1074                 }
1075
1076                 for (i = 0; i < nr_cpus; i++) {
1077                         struct datarec *rc = &r->cpu[i];
1078                         struct datarec *pc, p_beg = {};
1079                         char str[64];
1080
1081                         pc = p == &beg ? &p_beg : &p->cpu[i];
1082
1083                         pps = calc_pps(rc, pc, t);
1084                         drop = calc_drop_pps(rc, pc, t);
1085                         err = calc_errs_pps(rc, pc, t);
1086
1087                         if (!pps && !drop && !err)
1088                                 continue;
1089
1090                         snprintf(str, sizeof(str), "cpu:%d", i);
1091                         info = calc_info_pps(rc, pc, t);
1092                         if (info > 0)
1093                                 info = (pps + drop) / info; /* calc avg bulk */
1094
1095                         print_default("     %-18s" FMT_COLUMNf FMT_COLUMNf FMT_COLUMNf
1096                                       __COLUMN(".2f") "\n", str, XMIT(pps),
1097                                       DROP(drop), err, "drv_err/s", info, "bulk-avg");
1098                 }
1099         }
1100 }
1101
1102 static void stats_print(const char *prefix, int mask, struct stats_record *r,
1103                         struct stats_record *p, struct sample_output *out)
1104 {
1105         int nr_cpus = libbpf_num_possible_cpus();
1106         const char *str;
1107
1108         print_always("%-23s", prefix ?: "Summary");
1109         if (mask & SAMPLE_RX_CNT)
1110                 print_always(FMT_COLUMNl, RX(out->totals.rx));
1111         if (mask & SAMPLE_REDIRECT_CNT)
1112                 print_always(FMT_COLUMNl, REDIR(out->totals.redir));
1113         printf(FMT_COLUMNl,
1114                out->totals.err + out->totals.drop + out->totals.drop_xmit,
1115                "err,drop/s");
1116         if (mask & SAMPLE_DEVMAP_XMIT_CNT ||
1117             mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI)
1118                 printf(FMT_COLUMNl, XMIT(out->totals.xmit));
1119         printf("\n");
1120
1121         if (mask & SAMPLE_RX_CNT) {
1122                 str = (sample_log_level & LL_DEFAULT) && out->rx_cnt.pps ?
1123                                     "receive total" :
1124                                     "receive";
1125                 print_err((out->rx_cnt.err || out->rx_cnt.drop),
1126                           "  %-20s " FMT_COLUMNl FMT_COLUMNl FMT_COLUMNl "\n",
1127                           str, PPS(out->rx_cnt.pps), DROP(out->rx_cnt.drop),
1128                           ERR(out->rx_cnt.err));
1129
1130                 stats_get_rx_cnt(r, p, nr_cpus, NULL);
1131         }
1132
1133         if (mask & SAMPLE_CPUMAP_ENQUEUE_CNT)
1134                 stats_get_cpumap_enqueue(r, p, nr_cpus);
1135
1136         if (mask & SAMPLE_CPUMAP_KTHREAD_CNT) {
1137                 stats_get_cpumap_kthread(r, p, nr_cpus);
1138                 stats_get_cpumap_remote(r, p, nr_cpus);
1139         }
1140
1141         if (mask & SAMPLE_REDIRECT_CNT) {
1142                 str = out->redir_cnt.suc ? "redirect total" : "redirect";
1143                 print_default("  %-20s " FMT_COLUMNl "\n", str,
1144                               REDIR(out->redir_cnt.suc));
1145
1146                 stats_get_redirect_cnt(r, p, nr_cpus, NULL);
1147         }
1148
1149         if (mask & SAMPLE_REDIRECT_ERR_CNT) {
1150                 str = (sample_log_level & LL_DEFAULT) && out->redir_cnt.err ?
1151                                     "redirect_err total" :
1152                                     "redirect_err";
1153                 print_err(out->redir_cnt.err, "  %-20s " FMT_COLUMNl "\n", str,
1154                           ERR(out->redir_cnt.err));
1155
1156                 stats_get_redirect_err_cnt(r, p, nr_cpus, NULL);
1157         }
1158
1159         if (mask & SAMPLE_EXCEPTION_CNT) {
1160                 str = out->except_cnt.hits ? "xdp_exception total" :
1161                                                    "xdp_exception";
1162
1163                 print_err(out->except_cnt.hits, "  %-20s " FMT_COLUMNl "\n", str,
1164                           HITS(out->except_cnt.hits));
1165
1166                 stats_get_exception_cnt(r, p, nr_cpus, NULL);
1167         }
1168
1169         if (mask & SAMPLE_DEVMAP_XMIT_CNT) {
1170                 str = (sample_log_level & LL_DEFAULT) && out->xmit_cnt.pps ?
1171                                     "devmap_xmit total" :
1172                                     "devmap_xmit";
1173
1174                 print_err(out->xmit_cnt.err || out->xmit_cnt.drop,
1175                           "  %-20s " FMT_COLUMNl FMT_COLUMNl FMT_COLUMNl
1176                                   __COLUMN(".2f") "\n",
1177                           str, XMIT(out->xmit_cnt.pps),
1178                           DROP(out->xmit_cnt.drop), out->xmit_cnt.err,
1179                           "drv_err/s", out->xmit_cnt.bavg, "bulk-avg");
1180
1181                 stats_get_devmap_xmit(r, p, nr_cpus, NULL);
1182         }
1183
1184         if (mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI)
1185                 stats_get_devmap_xmit_multi(r, p, nr_cpus, NULL,
1186                                             mask & SAMPLE_DEVMAP_XMIT_CNT);
1187
1188         if (sample_log_level & LL_DEFAULT ||
1189             ((sample_log_level & LL_SIMPLE) && sample_err_exp)) {
1190                 sample_err_exp = false;
1191                 printf("\n");
1192         }
1193 }
1194
1195 int sample_setup_maps(struct bpf_map **maps)
1196 {
1197         sample_n_cpus = libbpf_num_possible_cpus();
1198
1199         for (int i = 0; i < MAP_DEVMAP_XMIT_MULTI; i++) {
1200                 sample_map[i] = maps[i];
1201
1202                 switch (i) {
1203                 case MAP_RX:
1204                 case MAP_CPUMAP_KTHREAD:
1205                 case MAP_DEVMAP_XMIT:
1206                         sample_map_count[i] = sample_n_cpus;
1207                         break;
1208                 case MAP_REDIRECT_ERR:
1209                         sample_map_count[i] =
1210                                 XDP_REDIRECT_ERR_MAX * sample_n_cpus;
1211                         break;
1212                 case MAP_EXCEPTION:
1213                         sample_map_count[i] = XDP_ACTION_MAX * sample_n_cpus;
1214                 case MAP_CPUMAP_ENQUEUE:
1215                         sample_map_count[i] = sample_n_cpus * sample_n_cpus;
1216                         break;
1217                 default:
1218                         return -EINVAL;
1219                 }
1220                 if (bpf_map__set_max_entries(sample_map[i], sample_map_count[i]) < 0)
1221                         return -errno;
1222         }
1223         sample_map[MAP_DEVMAP_XMIT_MULTI] = maps[MAP_DEVMAP_XMIT_MULTI];
1224         return 0;
1225 }
1226
1227 static int sample_setup_maps_mappings(void)
1228 {
1229         for (int i = 0; i < MAP_DEVMAP_XMIT_MULTI; i++) {
1230                 size_t size = sample_map_count[i] * sizeof(struct datarec);
1231
1232                 sample_mmap[i] = mmap(NULL, size, PROT_READ | PROT_WRITE,
1233                                       MAP_SHARED, bpf_map__fd(sample_map[i]), 0);
1234                 if (sample_mmap[i] == MAP_FAILED)
1235                         return -errno;
1236         }
1237         return 0;
1238 }
1239
1240 int __sample_init(int mask)
1241 {
1242         sigset_t st;
1243
1244         sigemptyset(&st);
1245         sigaddset(&st, SIGQUIT);
1246         sigaddset(&st, SIGINT);
1247         sigaddset(&st, SIGTERM);
1248
1249         if (sigprocmask(SIG_BLOCK, &st, NULL) < 0)
1250                 return -errno;
1251
1252         sample_sig_fd = signalfd(-1, &st, SFD_CLOEXEC | SFD_NONBLOCK);
1253         if (sample_sig_fd < 0)
1254                 return -errno;
1255
1256         sample_mask = mask;
1257
1258         return sample_setup_maps_mappings();
1259 }
1260
1261 static int __sample_remove_xdp(int ifindex, __u32 prog_id, int xdp_flags)
1262 {
1263         __u32 cur_prog_id = 0;
1264         int ret;
1265
1266         if (prog_id) {
1267                 ret = bpf_xdp_query_id(ifindex, xdp_flags, &cur_prog_id);
1268                 if (ret < 0)
1269                         return -errno;
1270
1271                 if (prog_id != cur_prog_id) {
1272                         print_always(
1273                                 "Program on ifindex %d does not match installed "
1274                                 "program, skipping unload\n",
1275                                 ifindex);
1276                         return -ENOENT;
1277                 }
1278         }
1279
1280         return bpf_xdp_detach(ifindex, xdp_flags, NULL);
1281 }
1282
1283 int sample_install_xdp(struct bpf_program *xdp_prog, int ifindex, bool generic,
1284                        bool force)
1285 {
1286         int ret, xdp_flags = 0;
1287         __u32 prog_id = 0;
1288
1289         if (sample_xdp_cnt == 32) {
1290                 fprintf(stderr,
1291                         "Total limit for installed XDP programs in a sample reached\n");
1292                 return -ENOTSUP;
1293         }
1294
1295         xdp_flags |= !force ? XDP_FLAGS_UPDATE_IF_NOEXIST : 0;
1296         xdp_flags |= generic ? XDP_FLAGS_SKB_MODE : XDP_FLAGS_DRV_MODE;
1297         ret = bpf_xdp_attach(ifindex, bpf_program__fd(xdp_prog), xdp_flags, NULL);
1298         if (ret < 0) {
1299                 ret = -errno;
1300                 fprintf(stderr,
1301                         "Failed to install program \"%s\" on ifindex %d, mode = %s, "
1302                         "force = %s: %s\n",
1303                         bpf_program__name(xdp_prog), ifindex,
1304                         generic ? "skb" : "native", force ? "true" : "false",
1305                         strerror(-ret));
1306                 return ret;
1307         }
1308
1309         ret = bpf_xdp_query_id(ifindex, xdp_flags, &prog_id);
1310         if (ret < 0) {
1311                 ret = -errno;
1312                 fprintf(stderr,
1313                         "Failed to get XDP program id for ifindex %d, removing program: %s\n",
1314                         ifindex, strerror(errno));
1315                 __sample_remove_xdp(ifindex, 0, xdp_flags);
1316                 return ret;
1317         }
1318         sample_xdp_progs[sample_xdp_cnt++] =
1319                 (struct xdp_desc){ ifindex, prog_id, xdp_flags };
1320
1321         return 0;
1322 }
1323
1324 static void sample_summary_print(void)
1325 {
1326         double num = sample_out.rx_cnt.num;
1327
1328         if (sample_out.totals.rx) {
1329                 double pkts = sample_out.totals.rx;
1330
1331                 print_always("  Packets received    : %'-10llu\n",
1332                              sample_out.totals.rx);
1333                 print_always("  Average packets/s   : %'-10.0f\n",
1334                              sample_round(pkts / num));
1335         }
1336         if (sample_out.totals.redir) {
1337                 double pkts = sample_out.totals.redir;
1338
1339                 print_always("  Packets redirected  : %'-10llu\n",
1340                              sample_out.totals.redir);
1341                 print_always("  Average redir/s     : %'-10.0f\n",
1342                              sample_round(pkts / num));
1343         }
1344         if (sample_out.totals.drop)
1345                 print_always("  Rx dropped          : %'-10llu\n",
1346                              sample_out.totals.drop);
1347         if (sample_out.totals.drop_xmit)
1348                 print_always("  Tx dropped          : %'-10llu\n",
1349                              sample_out.totals.drop_xmit);
1350         if (sample_out.totals.err)
1351                 print_always("  Errors recorded     : %'-10llu\n",
1352                              sample_out.totals.err);
1353         if (sample_out.totals.xmit) {
1354                 double pkts = sample_out.totals.xmit;
1355
1356                 print_always("  Packets transmitted : %'-10llu\n",
1357                              sample_out.totals.xmit);
1358                 print_always("  Average transmit/s  : %'-10.0f\n",
1359                              sample_round(pkts / num));
1360         }
1361 }
1362
1363 void sample_exit(int status)
1364 {
1365         size_t size;
1366
1367         for (int i = 0; i < NUM_MAP; i++) {
1368                 size = sample_map_count[i] * sizeof(**sample_mmap);
1369                 munmap(sample_mmap[i], size);
1370         }
1371         while (sample_xdp_cnt--) {
1372                 int i = sample_xdp_cnt, ifindex, xdp_flags;
1373                 __u32 prog_id;
1374
1375                 prog_id = sample_xdp_progs[i].prog_id;
1376                 ifindex = sample_xdp_progs[i].ifindex;
1377                 xdp_flags = sample_xdp_progs[i].flags;
1378
1379                 __sample_remove_xdp(ifindex, prog_id, xdp_flags);
1380         }
1381         sample_summary_print();
1382         close(sample_sig_fd);
1383         exit(status);
1384 }
1385
1386 static int sample_stats_collect(struct stats_record *rec)
1387 {
1388         int i;
1389
1390         if (sample_mask & SAMPLE_RX_CNT)
1391                 map_collect_percpu(sample_mmap[MAP_RX], &rec->rx_cnt);
1392
1393         if (sample_mask & SAMPLE_REDIRECT_CNT)
1394                 map_collect_percpu(sample_mmap[MAP_REDIRECT_ERR], &rec->redir_err[0]);
1395
1396         if (sample_mask & SAMPLE_REDIRECT_ERR_CNT) {
1397                 for (i = 1; i < XDP_REDIRECT_ERR_MAX; i++)
1398                         map_collect_percpu(&sample_mmap[MAP_REDIRECT_ERR][i * sample_n_cpus],
1399                                            &rec->redir_err[i]);
1400         }
1401
1402         if (sample_mask & SAMPLE_CPUMAP_ENQUEUE_CNT)
1403                 for (i = 0; i < sample_n_cpus; i++)
1404                         map_collect_percpu(&sample_mmap[MAP_CPUMAP_ENQUEUE][i * sample_n_cpus],
1405                                            &rec->enq[i]);
1406
1407         if (sample_mask & SAMPLE_CPUMAP_KTHREAD_CNT)
1408                 map_collect_percpu(sample_mmap[MAP_CPUMAP_KTHREAD],
1409                                    &rec->kthread);
1410
1411         if (sample_mask & SAMPLE_EXCEPTION_CNT)
1412                 for (i = 0; i < XDP_ACTION_MAX; i++)
1413                         map_collect_percpu(&sample_mmap[MAP_EXCEPTION][i * sample_n_cpus],
1414                                            &rec->exception[i]);
1415
1416         if (sample_mask & SAMPLE_DEVMAP_XMIT_CNT)
1417                 map_collect_percpu(sample_mmap[MAP_DEVMAP_XMIT], &rec->devmap_xmit);
1418
1419         if (sample_mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI) {
1420                 if (map_collect_percpu_devmap(bpf_map__fd(sample_map[MAP_DEVMAP_XMIT_MULTI]), rec) < 0)
1421                         return -EINVAL;
1422         }
1423         return 0;
1424 }
1425
1426 static void sample_summary_update(struct sample_output *out)
1427 {
1428         sample_out.totals.rx += out->totals.rx;
1429         sample_out.totals.redir += out->totals.redir;
1430         sample_out.totals.drop += out->totals.drop;
1431         sample_out.totals.drop_xmit += out->totals.drop_xmit;
1432         sample_out.totals.err += out->totals.err;
1433         sample_out.totals.xmit += out->totals.xmit;
1434         sample_out.rx_cnt.num++;
1435 }
1436
1437 static void sample_stats_print(int mask, struct stats_record *cur,
1438                                struct stats_record *prev, char *prog_name)
1439 {
1440         struct sample_output out = {};
1441
1442         if (mask & SAMPLE_RX_CNT)
1443                 stats_get_rx_cnt(cur, prev, 0, &out);
1444         if (mask & SAMPLE_REDIRECT_CNT)
1445                 stats_get_redirect_cnt(cur, prev, 0, &out);
1446         if (mask & SAMPLE_REDIRECT_ERR_CNT)
1447                 stats_get_redirect_err_cnt(cur, prev, 0, &out);
1448         if (mask & SAMPLE_EXCEPTION_CNT)
1449                 stats_get_exception_cnt(cur, prev, 0, &out);
1450         if (mask & SAMPLE_DEVMAP_XMIT_CNT)
1451                 stats_get_devmap_xmit(cur, prev, 0, &out);
1452         else if (mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI)
1453                 stats_get_devmap_xmit_multi(cur, prev, 0, &out,
1454                                             mask & SAMPLE_DEVMAP_XMIT_CNT);
1455         sample_summary_update(&out);
1456
1457         stats_print(prog_name, mask, cur, prev, &out);
1458 }
1459
1460 void sample_switch_mode(void)
1461 {
1462         sample_log_level ^= LL_DEBUG - 1;
1463 }
1464
1465 static int sample_signal_cb(void)
1466 {
1467         struct signalfd_siginfo si;
1468         int r;
1469
1470         r = read(sample_sig_fd, &si, sizeof(si));
1471         if (r < 0)
1472                 return -errno;
1473
1474         switch (si.ssi_signo) {
1475         case SIGQUIT:
1476                 sample_switch_mode();
1477                 printf("\n");
1478                 break;
1479         default:
1480                 printf("\n");
1481                 return 1;
1482         }
1483
1484         return 0;
1485 }
1486
1487 /* Pointer swap trick */
1488 static void swap(struct stats_record **a, struct stats_record **b)
1489 {
1490         struct stats_record *tmp;
1491
1492         tmp = *a;
1493         *a = *b;
1494         *b = tmp;
1495 }
1496
1497 static int sample_timer_cb(int timerfd, struct stats_record **rec,
1498                            struct stats_record **prev)
1499 {
1500         char line[64] = "Summary";
1501         int ret;
1502         __u64 t;
1503
1504         ret = read(timerfd, &t, sizeof(t));
1505         if (ret < 0)
1506                 return -errno;
1507
1508         swap(prev, rec);
1509         ret = sample_stats_collect(*rec);
1510         if (ret < 0)
1511                 return ret;
1512
1513         if (sample_xdp_cnt == 2 && !(sample_mask & SAMPLE_SKIP_HEADING)) {
1514                 char fi[IFNAMSIZ];
1515                 char to[IFNAMSIZ];
1516                 const char *f, *t;
1517
1518                 f = t = NULL;
1519                 if (if_indextoname(sample_xdp_progs[0].ifindex, fi))
1520                         f = fi;
1521                 if (if_indextoname(sample_xdp_progs[1].ifindex, to))
1522                         t = to;
1523
1524                 snprintf(line, sizeof(line), "%s->%s", f ?: "?", t ?: "?");
1525         }
1526
1527         sample_stats_print(sample_mask, *rec, *prev, line);
1528         return 0;
1529 }
1530
1531 int sample_run(int interval, void (*post_cb)(void *), void *ctx)
1532 {
1533         struct timespec ts = { interval, 0 };
1534         struct itimerspec its = { ts, ts };
1535         struct stats_record *rec, *prev;
1536         struct pollfd pfd[2] = {};
1537         int timerfd, ret;
1538
1539         if (!interval) {
1540                 fprintf(stderr, "Incorrect interval 0\n");
1541                 return -EINVAL;
1542         }
1543         sample_interval = interval;
1544         /* Pretty print numbers */
1545         setlocale(LC_NUMERIC, "en_US.UTF-8");
1546
1547         timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK);
1548         if (timerfd < 0)
1549                 return -errno;
1550         timerfd_settime(timerfd, 0, &its, NULL);
1551
1552         pfd[0].fd = sample_sig_fd;
1553         pfd[0].events = POLLIN;
1554
1555         pfd[1].fd = timerfd;
1556         pfd[1].events = POLLIN;
1557
1558         ret = -ENOMEM;
1559         rec = alloc_stats_record();
1560         if (!rec)
1561                 goto end;
1562         prev = alloc_stats_record();
1563         if (!prev)
1564                 goto end_rec;
1565
1566         ret = sample_stats_collect(rec);
1567         if (ret < 0)
1568                 goto end_rec_prev;
1569
1570         for (;;) {
1571                 ret = poll(pfd, 2, -1);
1572                 if (ret < 0) {
1573                         if (errno == EINTR)
1574                                 continue;
1575                         else
1576                                 break;
1577                 }
1578
1579                 if (pfd[0].revents & POLLIN)
1580                         ret = sample_signal_cb();
1581                 else if (pfd[1].revents & POLLIN)
1582                         ret = sample_timer_cb(timerfd, &rec, &prev);
1583
1584                 if (ret)
1585                         break;
1586
1587                 if (post_cb)
1588                         post_cb(ctx);
1589         }
1590
1591 end_rec_prev:
1592         free_stats_record(prev);
1593 end_rec:
1594         free_stats_record(rec);
1595 end:
1596         close(timerfd);
1597
1598         return ret;
1599 }
1600
1601 const char *get_driver_name(int ifindex)
1602 {
1603         struct ethtool_drvinfo drv = {};
1604         char ifname[IF_NAMESIZE];
1605         static char drvname[32];
1606         struct ifreq ifr = {};
1607         int fd, r = 0;
1608
1609         fd = socket(AF_INET, SOCK_DGRAM, 0);
1610         if (fd < 0)
1611                 return "[error]";
1612
1613         if (!if_indextoname(ifindex, ifname))
1614                 goto end;
1615
1616         drv.cmd = ETHTOOL_GDRVINFO;
1617         safe_strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
1618         ifr.ifr_data = (void *)&drv;
1619
1620         r = ioctl(fd, SIOCETHTOOL, &ifr);
1621         if (r)
1622                 goto end;
1623
1624         safe_strncpy(drvname, drv.driver, sizeof(drvname));
1625
1626         close(fd);
1627         return drvname;
1628
1629 end:
1630         r = errno;
1631         close(fd);
1632         return r == EOPNOTSUPP ? "loopback" : "[error]";
1633 }
1634
1635 int get_mac_addr(int ifindex, void *mac_addr)
1636 {
1637         char ifname[IF_NAMESIZE];
1638         struct ifreq ifr = {};
1639         int fd, r;
1640
1641         fd = socket(AF_INET, SOCK_DGRAM, 0);
1642         if (fd < 0)
1643                 return -errno;
1644
1645         if (!if_indextoname(ifindex, ifname)) {
1646                 r = -errno;
1647                 goto end;
1648         }
1649
1650         safe_strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
1651
1652         r = ioctl(fd, SIOCGIFHWADDR, &ifr);
1653         if (r) {
1654                 r = -errno;
1655                 goto end;
1656         }
1657
1658         memcpy(mac_addr, ifr.ifr_hwaddr.sa_data, 6 * sizeof(char));
1659
1660 end:
1661         close(fd);
1662         return r;
1663 }
1664
1665 __attribute__((constructor)) static void sample_ctor(void)
1666 {
1667         if (libbpf_set_strict_mode(LIBBPF_STRICT_ALL) < 0) {
1668                 fprintf(stderr, "Failed to set libbpf strict mode: %s\n",
1669                         strerror(errno));
1670                 /* Just exit, nothing to cleanup right now */
1671                 exit(EXIT_FAIL_BPF);
1672         }
1673 }