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