lib/librte_eal/common/rte_service.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2017 Intel Corporation
   3  */
   4
   5 #include <stdio.h>
   6 #include <unistd.h>
   7 #include <inttypes.h>
   8 #include <limits.h>
   9 #include <string.h>
  10
  11 #include <rte_compat.h>
  12 #include <rte_service.h>
  13 #include <rte_service_component.h>
  14
  15 #include <rte_eal.h>
  16 #include <rte_lcore.h>
  17 #include <rte_common.h>
  18 #include <rte_debug.h>
  19 #include <rte_cycles.h>
  20 #include <rte_atomic.h>
  21 #include <rte_memory.h>
  22 #include <rte_malloc.h>
  23
  24 #include "eal_private.h"
  25
  26 #define RTE_SERVICE_NUM_MAX 64
  27
  28 #define SERVICE_F_REGISTERED    (1 << 0)
  29 #define SERVICE_F_STATS_ENABLED (1 << 1)
  30 #define SERVICE_F_START_CHECK   (1 << 2)
  31
  32 /* runstates for services and lcores, denoting if they are active or not */
  33 #define RUNSTATE_STOPPED 0
  34 #define RUNSTATE_RUNNING 1
  35
  36 /* internal representation of a service */
  37 struct rte_service_spec_impl {
  38         /* public part of the struct */
  39         struct rte_service_spec spec;
  40
  41         /* atomic lock that when set indicates a service core is currently
  42          * running this service callback. When not set, a core may take the
  43          * lock and then run the service callback.
  44          */
  45         rte_atomic32_t execute_lock;
  46
  47         /* API set/get-able variables */
  48         int8_t app_runstate;
  49         int8_t comp_runstate;
  50         uint8_t internal_flags;
  51
  52         /* per service statistics */
  53         /* Indicates how many cores the service is mapped to run on.
  54          * It does not indicate the number of cores the service is running
  55          * on currently.
  56          */
  57         rte_atomic32_t num_mapped_cores;
  58         uint64_t calls;
  59         uint64_t cycles_spent;
  60 } __rte_cache_aligned;
  61
  62 /* the internal values of a service core */
  63 struct core_state {
  64         /* map of services IDs are run on this core */
  65         uint64_t service_mask;
  66         uint8_t runstate; /* running or stopped */
  67         uint8_t is_service_core; /* set if core is currently a service core */
  68         uint8_t service_active_on_lcore[RTE_SERVICE_NUM_MAX];
  69         uint64_t loops;
  70         uint64_t calls_per_service[RTE_SERVICE_NUM_MAX];
  71 } __rte_cache_aligned;
  72
  73 static uint32_t rte_service_count;
  74 static struct rte_service_spec_impl *rte_services;
  75 static struct core_state *lcore_states;
  76 static uint32_t rte_service_library_initialized;
  77
  78 int32_t
  79 rte_service_init(void)
  80 {
  81         if (rte_service_library_initialized) {
  82                 RTE_LOG(NOTICE, EAL,
  83                         "service library init() called, init flag %d\n",
  84                         rte_service_library_initialized);
  85                 return -EALREADY;
  86         }
  87
  88         rte_services = rte_calloc("rte_services", RTE_SERVICE_NUM_MAX,
  89                         sizeof(struct rte_service_spec_impl),
  90                         RTE_CACHE_LINE_SIZE);
  91         if (!rte_services) {
  92                 RTE_LOG(ERR, EAL, "error allocating rte services array\n");
  93                 goto fail_mem;
  94         }
  95
  96         lcore_states = rte_calloc("rte_service_core_states", RTE_MAX_LCORE,
  97                         sizeof(struct core_state), RTE_CACHE_LINE_SIZE);
  98         if (!lcore_states) {
  99                 RTE_LOG(ERR, EAL, "error allocating core states array\n");
 100                 goto fail_mem;
 101         }
 102
 103         int i;
 104         int count = 0;
 105         struct rte_config *cfg = rte_eal_get_configuration();
 106         for (i = 0; i < RTE_MAX_LCORE; i++) {
 107                 if (lcore_config[i].core_role == ROLE_SERVICE) {
 108                         if ((unsigned int)i == cfg->master_lcore)
 109                                 continue;
 110                         rte_service_lcore_add(i);
 111                         count++;
 112                 }
 113         }
 114
 115         rte_service_library_initialized = 1;
 116         return 0;
 117 fail_mem:
 118         rte_free(rte_services);
 119         rte_free(lcore_states);
 120         return -ENOMEM;
 121 }
 122
 123 void
 124 rte_service_finalize(void)
 125 {
 126         if (!rte_service_library_initialized)
 127                 return;
 128
 129         rte_service_lcore_reset_all();
 130         rte_eal_mp_wait_lcore();
 131
 132         rte_free(rte_services);
 133         rte_free(lcore_states);
 134
 135         rte_service_library_initialized = 0;
 136 }
 137
 138 /* returns 1 if service is registered and has not been unregistered
 139  * Returns 0 if service never registered, or has been unregistered
 140  */
 141 static inline int
 142 service_valid(uint32_t id)
 143 {
 144         return !!(rte_services[id].internal_flags & SERVICE_F_REGISTERED);
 145 }
 146
 147 static struct rte_service_spec_impl *
 148 service_get(uint32_t id)
 149 {
 150         return &rte_services[id];
 151 }
 152
 153 /* validate ID and retrieve service pointer, or return error value */
 154 #define SERVICE_VALID_GET_OR_ERR_RET(id, service, retval) do {          \
 155         if (id >= RTE_SERVICE_NUM_MAX || !service_valid(id))            \
 156                 return retval;                                          \
 157         service = &rte_services[id];                                    \
 158 } while (0)
 159
 160 /* returns 1 if statistics should be collected for service
 161  * Returns 0 if statistics should not be collected for service
 162  */
 163 static inline int
 164 service_stats_enabled(struct rte_service_spec_impl *impl)
 165 {
 166         return !!(impl->internal_flags & SERVICE_F_STATS_ENABLED);
 167 }
 168
 169 static inline int
 170 service_mt_safe(struct rte_service_spec_impl *s)
 171 {
 172         return !!(s->spec.capabilities & RTE_SERVICE_CAP_MT_SAFE);
 173 }
 174
 175 int32_t
 176 rte_service_set_stats_enable(uint32_t id, int32_t enabled)
 177 {
 178         struct rte_service_spec_impl *s;
 179         SERVICE_VALID_GET_OR_ERR_RET(id, s, 0);
 180
 181         if (enabled)
 182                 s->internal_flags |= SERVICE_F_STATS_ENABLED;
 183         else
 184                 s->internal_flags &= ~(SERVICE_F_STATS_ENABLED);
 185
 186         return 0;
 187 }
 188
 189 int32_t
 190 rte_service_set_runstate_mapped_check(uint32_t id, int32_t enabled)
 191 {
 192         struct rte_service_spec_impl *s;
 193         SERVICE_VALID_GET_OR_ERR_RET(id, s, 0);
 194
 195         if (enabled)
 196                 s->internal_flags |= SERVICE_F_START_CHECK;
 197         else
 198                 s->internal_flags &= ~(SERVICE_F_START_CHECK);
 199
 200         return 0;
 201 }
 202
 203 uint32_t
 204 rte_service_get_count(void)
 205 {
 206         return rte_service_count;
 207 }
 208
 209 int32_t
 210 rte_service_get_by_name(const char *name, uint32_t *service_id)
 211 {
 212         if (!service_id)
 213                 return -EINVAL;
 214
 215         int i;
 216         for (i = 0; i < RTE_SERVICE_NUM_MAX; i++) {
 217                 if (service_valid(i) &&
 218                                 strcmp(name, rte_services[i].spec.name) == 0) {
 219                         *service_id = i;
 220                         return 0;
 221                 }
 222         }
 223
 224         return -ENODEV;
 225 }
 226
 227 const char *
 228 rte_service_get_name(uint32_t id)
 229 {
 230         struct rte_service_spec_impl *s;
 231         SERVICE_VALID_GET_OR_ERR_RET(id, s, 0);
 232         return s->spec.name;
 233 }
 234
 235 int32_t
 236 rte_service_probe_capability(uint32_t id, uint32_t capability)
 237 {
 238         struct rte_service_spec_impl *s;
 239         SERVICE_VALID_GET_OR_ERR_RET(id, s, -EINVAL);
 240         return !!(s->spec.capabilities & capability);
 241 }
 242
 243 int32_t
 244 rte_service_component_register(const struct rte_service_spec *spec,
 245                                uint32_t *id_ptr)
 246 {
 247         uint32_t i;
 248         int32_t free_slot = -1;
 249
 250         if (spec->callback == NULL || strlen(spec->name) == 0)
 251                 return -EINVAL;
 252
 253         for (i = 0; i < RTE_SERVICE_NUM_MAX; i++) {
 254                 if (!service_valid(i)) {
 255                         free_slot = i;
 256                         break;
 257                 }
 258         }
 259
 260         if ((free_slot < 0) || (i == RTE_SERVICE_NUM_MAX))
 261                 return -ENOSPC;
 262
 263         struct rte_service_spec_impl *s = &rte_services[free_slot];
 264         s->spec = *spec;
 265         s->internal_flags |= SERVICE_F_REGISTERED | SERVICE_F_START_CHECK;
 266
 267         rte_smp_wmb();
 268         rte_service_count++;
 269
 270         if (id_ptr)
 271                 *id_ptr = free_slot;
 272
 273         return 0;
 274 }
 275
 276 int32_t
 277 rte_service_component_unregister(uint32_t id)
 278 {
 279         uint32_t i;
 280         struct rte_service_spec_impl *s;
 281         SERVICE_VALID_GET_OR_ERR_RET(id, s, -EINVAL);
 282
 283         rte_service_count--;
 284         rte_smp_wmb();
 285
 286         s->internal_flags &= ~(SERVICE_F_REGISTERED);
 287
 288         /* clear the run-bit in all cores */
 289         for (i = 0; i < RTE_MAX_LCORE; i++)
 290                 lcore_states[i].service_mask &= ~(UINT64_C(1) << id);
 291
 292         memset(&rte_services[id], 0, sizeof(struct rte_service_spec_impl));
 293
 294         return 0;
 295 }
 296
 297 int32_t
 298 rte_service_component_runstate_set(uint32_t id, uint32_t runstate)
 299 {
 300         struct rte_service_spec_impl *s;
 301         SERVICE_VALID_GET_OR_ERR_RET(id, s, -EINVAL);
 302
 303         if (runstate)
 304                 s->comp_runstate = RUNSTATE_RUNNING;
 305         else
 306                 s->comp_runstate = RUNSTATE_STOPPED;
 307
 308         rte_smp_wmb();
 309         return 0;
 310 }
 311
 312 int32_t
 313 rte_service_runstate_set(uint32_t id, uint32_t runstate)
 314 {
 315         struct rte_service_spec_impl *s;
 316         SERVICE_VALID_GET_OR_ERR_RET(id, s, -EINVAL);
 317
 318         if (runstate)
 319                 s->app_runstate = RUNSTATE_RUNNING;
 320         else
 321                 s->app_runstate = RUNSTATE_STOPPED;
 322
 323         rte_smp_wmb();
 324         return 0;
 325 }
 326
 327 int32_t
 328 rte_service_runstate_get(uint32_t id)
 329 {
 330         struct rte_service_spec_impl *s;
 331         SERVICE_VALID_GET_OR_ERR_RET(id, s, -EINVAL);
 332         rte_smp_rmb();
 333
 334         int check_disabled = !(s->internal_flags & SERVICE_F_START_CHECK);
 335         int lcore_mapped = (rte_atomic32_read(&s->num_mapped_cores) > 0);
 336
 337         return (s->app_runstate == RUNSTATE_RUNNING) &&
 338                 (s->comp_runstate == RUNSTATE_RUNNING) &&
 339                 (check_disabled | lcore_mapped);
 340 }
 341
 342 static inline void
 343 rte_service_runner_do_callback(struct rte_service_spec_impl *s,
 344                                struct core_state *cs, uint32_t service_idx)
 345 {
 346         void *userdata = s->spec.callback_userdata;
 347
 348         if (service_stats_enabled(s)) {
 349                 uint64_t start = rte_rdtsc();
 350                 s->spec.callback(userdata);
 351                 uint64_t end = rte_rdtsc();
 352                 s->cycles_spent += end - start;
 353                 cs->calls_per_service[service_idx]++;
 354                 s->calls++;
 355         } else
 356                 s->spec.callback(userdata);
 357 }
 358
 359
 360 /* Expects the service 's' is valid. */
 361 static int32_t
 362 service_run(uint32_t i, struct core_state *cs, uint64_t service_mask,
 363             struct rte_service_spec_impl *s, uint32_t serialize_mt_unsafe)
 364 {
 365         if (!s)
 366                 return -EINVAL;
 367
 368         if (s->comp_runstate != RUNSTATE_RUNNING ||
 369                         s->app_runstate != RUNSTATE_RUNNING ||
 370                         !(service_mask & (UINT64_C(1) << i))) {
 371                 cs->service_active_on_lcore[i] = 0;
 372                 return -ENOEXEC;
 373         }
 374
 375         cs->service_active_on_lcore[i] = 1;
 376
 377         if ((service_mt_safe(s) == 0) && (serialize_mt_unsafe == 1)) {
 378                 if (!rte_atomic32_cmpset((uint32_t *)&s->execute_lock, 0, 1))
 379                         return -EBUSY;
 380
 381                 rte_service_runner_do_callback(s, cs, i);
 382                 rte_atomic32_clear(&s->execute_lock);
 383         } else
 384                 rte_service_runner_do_callback(s, cs, i);
 385
 386         return 0;
 387 }
 388
 389 int32_t
 390 rte_service_may_be_active(uint32_t id)
 391 {
 392         uint32_t ids[RTE_MAX_LCORE] = {0};
 393         int32_t lcore_count = rte_service_lcore_list(ids, RTE_MAX_LCORE);
 394         int i;
 395
 396         if (id >= RTE_SERVICE_NUM_MAX || !service_valid(id))
 397                 return -EINVAL;
 398
 399         for (i = 0; i < lcore_count; i++) {
 400                 if (lcore_states[i].service_active_on_lcore[id])
 401                         return 1;
 402         }
 403
 404         return 0;
 405 }
 406
 407 int32_t
 408 rte_service_run_iter_on_app_lcore(uint32_t id, uint32_t serialize_mt_unsafe)
 409 {
 410         struct core_state *cs = &lcore_states[rte_lcore_id()];
 411         struct rte_service_spec_impl *s;
 412
 413         SERVICE_VALID_GET_OR_ERR_RET(id, s, -EINVAL);
 414
 415         /* Increment num_mapped_cores to reflect that this core is
 416          * now mapped capable of running the service.
 417          */
 418         rte_atomic32_inc(&s->num_mapped_cores);
 419
 420         int ret = service_run(id, cs, UINT64_MAX, s, serialize_mt_unsafe);
 421
 422         rte_atomic32_dec(&s->num_mapped_cores);
 423
 424         return ret;
 425 }
 426
 427 static int32_t
 428 rte_service_runner_func(void *arg)
 429 {
 430         RTE_SET_USED(arg);
 431         uint32_t i;
 432         const int lcore = rte_lcore_id();
 433         struct core_state *cs = &lcore_states[lcore];
 434
 435         while (lcore_states[lcore].runstate == RUNSTATE_RUNNING) {
 436                 const uint64_t service_mask = cs->service_mask;
 437
 438                 for (i = 0; i < RTE_SERVICE_NUM_MAX; i++) {
 439                         if (!service_valid(i))
 440                                 continue;
 441                         /* return value ignored as no change to code flow */
 442                         service_run(i, cs, service_mask, service_get(i), 1);
 443                 }
 444
 445                 cs->loops++;
 446
 447                 rte_smp_rmb();
 448         }
 449
 450         lcore_config[lcore].state = WAIT;
 451
 452         return 0;
 453 }
 454
 455 int32_t
 456 rte_service_lcore_count(void)
 457 {
 458         int32_t count = 0;
 459         uint32_t i;
 460         for (i = 0; i < RTE_MAX_LCORE; i++)
 461                 count += lcore_states[i].is_service_core;
 462         return count;
 463 }
 464
 465 int32_t
 466 rte_service_lcore_list(uint32_t array[], uint32_t n)
 467 {
 468         uint32_t count = rte_service_lcore_count();
 469         if (count > n)
 470                 return -ENOMEM;
 471
 472         if (!array)
 473                 return -EINVAL;
 474
 475         uint32_t i;
 476         uint32_t idx = 0;
 477         for (i = 0; i < RTE_MAX_LCORE; i++) {
 478                 struct core_state *cs = &lcore_states[i];
 479                 if (cs->is_service_core) {
 480                         array[idx] = i;
 481                         idx++;
 482                 }
 483         }
 484
 485         return count;
 486 }
 487
 488 int32_t
 489 rte_service_lcore_count_services(uint32_t lcore)
 490 {
 491         if (lcore >= RTE_MAX_LCORE)
 492                 return -EINVAL;
 493
 494         struct core_state *cs = &lcore_states[lcore];
 495         if (!cs->is_service_core)
 496                 return -ENOTSUP;
 497
 498         return __builtin_popcountll(cs->service_mask);
 499 }
 500
 501 int32_t
 502 rte_service_start_with_defaults(void)
 503 {
 504         /* create a default mapping from cores to services, then start the
 505          * services to make them transparent to unaware applications.
 506          */
 507         uint32_t i;
 508         int ret;
 509         uint32_t count = rte_service_get_count();
 510
 511         int32_t lcore_iter = 0;
 512         uint32_t ids[RTE_MAX_LCORE] = {0};
 513         int32_t lcore_count = rte_service_lcore_list(ids, RTE_MAX_LCORE);
 514
 515         if (lcore_count == 0)
 516                 return -ENOTSUP;
 517
 518         for (i = 0; (int)i < lcore_count; i++)
 519                 rte_service_lcore_start(ids[i]);
 520
 521         for (i = 0; i < count; i++) {
 522                 /* do 1:1 core mapping here, with each service getting
 523                  * assigned a single core by default. Adding multiple services
 524                  * should multiplex to a single core, or 1:1 if there are the
 525                  * same amount of services as service-cores
 526                  */
 527                 ret = rte_service_map_lcore_set(i, ids[lcore_iter], 1);
 528                 if (ret)
 529                         return -ENODEV;
 530
 531                 lcore_iter++;
 532                 if (lcore_iter >= lcore_count)
 533                         lcore_iter = 0;
 534
 535                 ret = rte_service_runstate_set(i, 1);
 536                 if (ret)
 537                         return -ENOEXEC;
 538         }
 539
 540         return 0;
 541 }
 542
 543 static int32_t
 544 service_update(struct rte_service_spec *service, uint32_t lcore,
 545                 uint32_t *set, uint32_t *enabled)
 546 {
 547         uint32_t i;
 548         int32_t sid = -1;
 549
 550         for (i = 0; i < RTE_SERVICE_NUM_MAX; i++) {
 551                 if ((struct rte_service_spec *)&rte_services[i] == service &&
 552                                 service_valid(i)) {
 553                         sid = i;
 554                         break;
 555                 }
 556         }
 557
 558         if (sid == -1 || lcore >= RTE_MAX_LCORE)
 559                 return -EINVAL;
 560
 561         if (!lcore_states[lcore].is_service_core)
 562                 return -EINVAL;
 563
 564         uint64_t sid_mask = UINT64_C(1) << sid;
 565         if (set) {
 566                 uint64_t lcore_mapped = lcore_states[lcore].service_mask &
 567                         sid_mask;
 568
 569                 if (*set && !lcore_mapped) {
 570                         lcore_states[lcore].service_mask |= sid_mask;
 571                         rte_atomic32_inc(&rte_services[sid].num_mapped_cores);
 572                 }
 573                 if (!*set && lcore_mapped) {
 574                         lcore_states[lcore].service_mask &= ~(sid_mask);
 575                         rte_atomic32_dec(&rte_services[sid].num_mapped_cores);
 576                 }
 577         }
 578
 579         if (enabled)
 580                 *enabled = !!(lcore_states[lcore].service_mask & (sid_mask));
 581
 582         rte_smp_wmb();
 583
 584         return 0;
 585 }
 586
 587 int32_t
 588 rte_service_map_lcore_set(uint32_t id, uint32_t lcore, uint32_t enabled)
 589 {
 590         struct rte_service_spec_impl *s;
 591         SERVICE_VALID_GET_OR_ERR_RET(id, s, -EINVAL);
 592         uint32_t on = enabled > 0;
 593         return service_update(&s->spec, lcore, &on, 0);
 594 }
 595
 596 int32_t
 597 rte_service_map_lcore_get(uint32_t id, uint32_t lcore)
 598 {
 599         struct rte_service_spec_impl *s;
 600         SERVICE_VALID_GET_OR_ERR_RET(id, s, -EINVAL);
 601         uint32_t enabled;
 602         int ret = service_update(&s->spec, lcore, 0, &enabled);
 603         if (ret == 0)
 604                 return enabled;
 605         return ret;
 606 }
 607
 608 static void
 609 set_lcore_state(uint32_t lcore, int32_t state)
 610 {
 611         /* mark core state in hugepage backed config */
 612         struct rte_config *cfg = rte_eal_get_configuration();
 613         cfg->lcore_role[lcore] = state;
 614
 615         /* mark state in process local lcore_config */
 616         lcore_config[lcore].core_role = state;
 617
 618         /* update per-lcore optimized state tracking */
 619         lcore_states[lcore].is_service_core = (state == ROLE_SERVICE);
 620 }
 621
 622 int32_t
 623 rte_service_lcore_reset_all(void)
 624 {
 625         /* loop over cores, reset all to mask 0 */
 626         uint32_t i;
 627         for (i = 0; i < RTE_MAX_LCORE; i++) {
 628                 if (lcore_states[i].is_service_core) {
 629                         lcore_states[i].service_mask = 0;
 630                         set_lcore_state(i, ROLE_RTE);
 631                         lcore_states[i].runstate = RUNSTATE_STOPPED;
 632                 }
 633         }
 634         for (i = 0; i < RTE_SERVICE_NUM_MAX; i++)
 635                 rte_atomic32_set(&rte_services[i].num_mapped_cores, 0);
 636
 637         rte_smp_wmb();
 638
 639         return 0;
 640 }
 641
 642 int32_t
 643 rte_service_lcore_add(uint32_t lcore)
 644 {
 645         if (lcore >= RTE_MAX_LCORE)
 646                 return -EINVAL;
 647         if (lcore_states[lcore].is_service_core)
 648                 return -EALREADY;
 649
 650         set_lcore_state(lcore, ROLE_SERVICE);
 651
 652         /* ensure that after adding a core the mask and state are defaults */
 653         lcore_states[lcore].service_mask = 0;
 654         lcore_states[lcore].runstate = RUNSTATE_STOPPED;
 655
 656         rte_smp_wmb();
 657
 658         return rte_eal_wait_lcore(lcore);
 659 }
 660
 661 int32_t
 662 rte_service_lcore_del(uint32_t lcore)
 663 {
 664         if (lcore >= RTE_MAX_LCORE)
 665                 return -EINVAL;
 666
 667         struct core_state *cs = &lcore_states[lcore];
 668         if (!cs->is_service_core)
 669                 return -EINVAL;
 670
 671         if (cs->runstate != RUNSTATE_STOPPED)
 672                 return -EBUSY;
 673
 674         set_lcore_state(lcore, ROLE_RTE);
 675
 676         rte_smp_wmb();
 677         return 0;
 678 }
 679
 680 int32_t
 681 rte_service_lcore_start(uint32_t lcore)
 682 {
 683         if (lcore >= RTE_MAX_LCORE)
 684                 return -EINVAL;
 685
 686         struct core_state *cs = &lcore_states[lcore];
 687         if (!cs->is_service_core)
 688                 return -EINVAL;
 689
 690         if (cs->runstate == RUNSTATE_RUNNING)
 691                 return -EALREADY;
 692
 693         /* set core to run state first, and then launch otherwise it will
 694          * return immediately as runstate keeps it in the service poll loop
 695          */
 696         lcore_states[lcore].runstate = RUNSTATE_RUNNING;
 697
 698         int ret = rte_eal_remote_launch(rte_service_runner_func, 0, lcore);
 699         /* returns -EBUSY if the core is already launched, 0 on success */
 700         return ret;
 701 }
 702
 703 int32_t
 704 rte_service_lcore_stop(uint32_t lcore)
 705 {
 706         if (lcore >= RTE_MAX_LCORE)
 707                 return -EINVAL;
 708
 709         if (lcore_states[lcore].runstate == RUNSTATE_STOPPED)
 710                 return -EALREADY;
 711
 712         uint32_t i;
 713         uint64_t service_mask = lcore_states[lcore].service_mask;
 714         for (i = 0; i < RTE_SERVICE_NUM_MAX; i++) {
 715                 int32_t enabled = service_mask & (UINT64_C(1) << i);
 716                 int32_t service_running = rte_service_runstate_get(i);
 717                 int32_t only_core = (1 ==
 718                         rte_atomic32_read(&rte_services[i].num_mapped_cores));
 719
 720                 /* if the core is mapped, and the service is running, and this
 721                  * is the only core that is mapped, the service would cease to
 722                  * run if this core stopped, so fail instead.
 723                  */
 724                 if (enabled && service_running && only_core)
 725                         return -EBUSY;
 726         }
 727
 728         lcore_states[lcore].runstate = RUNSTATE_STOPPED;
 729
 730         return 0;
 731 }
 732
 733 int32_t
 734 rte_service_attr_get(uint32_t id, uint32_t attr_id, uint64_t *attr_value)
 735 {
 736         struct rte_service_spec_impl *s;
 737         SERVICE_VALID_GET_OR_ERR_RET(id, s, -EINVAL);
 738
 739         if (!attr_value)
 740                 return -EINVAL;
 741
 742         switch (attr_id) {
 743         case RTE_SERVICE_ATTR_CYCLES:
 744                 *attr_value = s->cycles_spent;
 745                 return 0;
 746         case RTE_SERVICE_ATTR_CALL_COUNT:
 747                 *attr_value = s->calls;
 748                 return 0;
 749         default:
 750                 return -EINVAL;
 751         }
 752 }
 753
 754 int32_t
 755 rte_service_lcore_attr_get(uint32_t lcore, uint32_t attr_id,
 756                            uint64_t *attr_value)
 757 {
 758         struct core_state *cs;
 759
 760         if (lcore >= RTE_MAX_LCORE || !attr_value)
 761                 return -EINVAL;
 762
 763         cs = &lcore_states[lcore];
 764         if (!cs->is_service_core)
 765                 return -ENOTSUP;
 766
 767         switch (attr_id) {
 768         case RTE_SERVICE_LCORE_ATTR_LOOPS:
 769                 *attr_value = cs->loops;
 770                 return 0;
 771         default:
 772                 return -EINVAL;
 773         }
 774 }
 775
 776 static void
 777 rte_service_dump_one(FILE *f, struct rte_service_spec_impl *s,
 778                      uint64_t all_cycles, uint32_t reset)
 779 {
 780         /* avoid divide by zero */
 781         if (all_cycles == 0)
 782                 all_cycles = 1;
 783
 784         int calls = 1;
 785         if (s->calls != 0)
 786                 calls = s->calls;
 787
 788         if (reset) {
 789                 s->cycles_spent = 0;
 790                 s->calls = 0;
 791                 return;
 792         }
 793
 794         if (f == NULL)
 795                 return;
 796
 797         fprintf(f, "  %s: stats %d\tcalls %"PRIu64"\tcycles %"
 798                         PRIu64"\tavg: %"PRIu64"\n",
 799                         s->spec.name, service_stats_enabled(s), s->calls,
 800                         s->cycles_spent, s->cycles_spent / calls);
 801 }
 802
 803 int32_t
 804 rte_service_attr_reset_all(uint32_t id)
 805 {
 806         struct rte_service_spec_impl *s;
 807         SERVICE_VALID_GET_OR_ERR_RET(id, s, -EINVAL);
 808
 809         int reset = 1;
 810         rte_service_dump_one(NULL, s, 0, reset);
 811         return 0;
 812 }
 813
 814 int32_t
 815 rte_service_lcore_attr_reset_all(uint32_t lcore)
 816 {
 817         struct core_state *cs;
 818
 819         if (lcore >= RTE_MAX_LCORE)
 820                 return -EINVAL;
 821
 822         cs = &lcore_states[lcore];
 823         if (!cs->is_service_core)
 824                 return -ENOTSUP;
 825
 826         cs->loops = 0;
 827
 828         return 0;
 829 }
 830
 831 static void
 832 service_dump_calls_per_lcore(FILE *f, uint32_t lcore, uint32_t reset)
 833 {
 834         uint32_t i;
 835         struct core_state *cs = &lcore_states[lcore];
 836
 837         fprintf(f, "%02d\t", lcore);
 838         for (i = 0; i < RTE_SERVICE_NUM_MAX; i++) {
 839                 if (!service_valid(i))
 840                         continue;
 841                 fprintf(f, "%"PRIu64"\t", cs->calls_per_service[i]);
 842                 if (reset)
 843                         cs->calls_per_service[i] = 0;
 844         }
 845         fprintf(f, "\n");
 846 }
 847
 848 int32_t
 849 rte_service_dump(FILE *f, uint32_t id)
 850 {
 851         uint32_t i;
 852         int print_one = (id != UINT32_MAX);
 853
 854         uint64_t total_cycles = 0;
 855
 856         for (i = 0; i < RTE_SERVICE_NUM_MAX; i++) {
 857                 if (!service_valid(i))
 858                         continue;
 859                 total_cycles += rte_services[i].cycles_spent;
 860         }
 861
 862         /* print only the specified service */
 863         if (print_one) {
 864                 struct rte_service_spec_impl *s;
 865                 SERVICE_VALID_GET_OR_ERR_RET(id, s, -EINVAL);
 866                 fprintf(f, "Service %s Summary\n", s->spec.name);
 867                 uint32_t reset = 0;
 868                 rte_service_dump_one(f, s, total_cycles, reset);
 869                 return 0;
 870         }
 871
 872         /* print all services, as UINT32_MAX was passed as id */
 873         fprintf(f, "Services Summary\n");
 874         for (i = 0; i < RTE_SERVICE_NUM_MAX; i++) {
 875                 if (!service_valid(i))
 876                         continue;
 877                 uint32_t reset = 0;
 878                 rte_service_dump_one(f, &rte_services[i], total_cycles, reset);
 879         }
 880
 881         fprintf(f, "Service Cores Summary\n");
 882         for (i = 0; i < RTE_MAX_LCORE; i++) {
 883                 if (lcore_config[i].core_role != ROLE_SERVICE)
 884                         continue;
 885
 886                 uint32_t reset = 0;
 887                 service_dump_calls_per_lcore(f, i, reset);
 888         }
 889
 890         return 0;
 891 }