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