lib/librte_eal/common/eal_common_proc.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2016-2018 Intel Corporation
   3  */
   4
   5 #include <dirent.h>
   6 #include <errno.h>
   7 #include <fcntl.h>
   8 #include <fnmatch.h>
   9 #include <inttypes.h>
  10 #include <libgen.h>
  11 #include <limits.h>
  12 #include <pthread.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <sys/file.h>
  17 #include <sys/time.h>
  18 #include <sys/types.h>
  19 #include <sys/socket.h>
  20 #include <sys/un.h>
  21 #include <unistd.h>
  22
  23 #include <rte_common.h>
  24 #include <rte_cycles.h>
  25 #include <rte_eal.h>
  26 #include <rte_errno.h>
  27 #include <rte_lcore.h>
  28 #include <rte_log.h>
  29 #include <rte_tailq.h>
  30
  31 #include "eal_private.h"
  32 #include "eal_filesystem.h"
  33 #include "eal_internal_cfg.h"
  34
  35 static int mp_fd = -1;
  36 static char mp_filter[PATH_MAX];   /* Filter for secondary process sockets */
  37 static char mp_dir_path[PATH_MAX]; /* The directory path for all mp sockets */
  38 static pthread_mutex_t mp_mutex_action = PTHREAD_MUTEX_INITIALIZER;
  39
  40 struct action_entry {
  41         TAILQ_ENTRY(action_entry) next;
  42         char action_name[RTE_MP_MAX_NAME_LEN];
  43         rte_mp_t action;
  44 };
  45
  46 /** Double linked list of actions. */
  47 TAILQ_HEAD(action_entry_list, action_entry);
  48
  49 static struct action_entry_list action_entry_list =
  50         TAILQ_HEAD_INITIALIZER(action_entry_list);
  51
  52 enum mp_type {
  53         MP_MSG, /* Share message with peers, will not block */
  54         MP_REQ, /* Request for information, Will block for a reply */
  55         MP_REP, /* Response to previously-received request */
  56         MP_IGN, /* Response telling requester to ignore this response */
  57 };
  58
  59 struct mp_msg_internal {
  60         int type;
  61         struct rte_mp_msg msg;
  62 };
  63
  64 struct async_request_param {
  65         rte_mp_async_reply_t clb;
  66         struct rte_mp_reply user_reply;
  67         struct timespec end;
  68         int n_responses_processed;
  69 };
  70
  71 struct pending_request {
  72         TAILQ_ENTRY(pending_request) next;
  73         enum {
  74                 REQUEST_TYPE_SYNC,
  75                 REQUEST_TYPE_ASYNC
  76         } type;
  77         char dst[PATH_MAX];
  78         struct rte_mp_msg *request;
  79         struct rte_mp_msg *reply;
  80         int reply_received;
  81         RTE_STD_C11
  82         union {
  83                 struct {
  84                         struct async_request_param *param;
  85                 } async;
  86                 struct {
  87                         pthread_cond_t cond;
  88                 } sync;
  89         };
  90 };
  91
  92 TAILQ_HEAD(pending_request_list, pending_request);
  93
  94 static struct {
  95         struct pending_request_list requests;
  96         pthread_mutex_t lock;
  97         pthread_cond_t async_cond;
  98 } pending_requests = {
  99         .requests = TAILQ_HEAD_INITIALIZER(pending_requests.requests),
 100         .lock = PTHREAD_MUTEX_INITIALIZER,
 101         .async_cond = PTHREAD_COND_INITIALIZER
 102         /**< used in async requests only */
 103 };
 104
 105 /* forward declarations */
 106 static int
 107 mp_send(struct rte_mp_msg *msg, const char *peer, int type);
 108
 109
 110 static struct pending_request *
 111 find_pending_request(const char *dst, const char *act_name)
 112 {
 113         struct pending_request *r;
 114
 115         TAILQ_FOREACH(r, &pending_requests.requests, next) {
 116                 if (!strcmp(r->dst, dst) &&
 117                     !strcmp(r->request->name, act_name))
 118                         break;
 119         }
 120
 121         return r;
 122 }
 123
 124 static void
 125 create_socket_path(const char *name, char *buf, int len)
 126 {
 127         const char *prefix = eal_mp_socket_path();
 128
 129         if (strlen(name) > 0)
 130                 snprintf(buf, len, "%s_%s", prefix, name);
 131         else
 132                 strlcpy(buf, prefix, len);
 133 }
 134
 135 int
 136 rte_eal_primary_proc_alive(const char *config_file_path)
 137 {
 138         int config_fd;
 139
 140         if (config_file_path)
 141                 config_fd = open(config_file_path, O_RDONLY);
 142         else {
 143                 const char *path;
 144
 145                 path = eal_runtime_config_path();
 146                 config_fd = open(path, O_RDONLY);
 147         }
 148         if (config_fd < 0)
 149                 return 0;
 150
 151         int ret = lockf(config_fd, F_TEST, 0);
 152         close(config_fd);
 153
 154         return !!ret;
 155 }
 156
 157 static struct action_entry *
 158 find_action_entry_by_name(const char *name)
 159 {
 160         struct action_entry *entry;
 161
 162         TAILQ_FOREACH(entry, &action_entry_list, next) {
 163                 if (strncmp(entry->action_name, name, RTE_MP_MAX_NAME_LEN) == 0)
 164                         break;
 165         }
 166
 167         return entry;
 168 }
 169
 170 static int
 171 validate_action_name(const char *name)
 172 {
 173         if (name == NULL) {
 174                 RTE_LOG(ERR, EAL, "Action name cannot be NULL\n");
 175                 rte_errno = EINVAL;
 176                 return -1;
 177         }
 178         if (strnlen(name, RTE_MP_MAX_NAME_LEN) == 0) {
 179                 RTE_LOG(ERR, EAL, "Length of action name is zero\n");
 180                 rte_errno = EINVAL;
 181                 return -1;
 182         }
 183         if (strnlen(name, RTE_MP_MAX_NAME_LEN) == RTE_MP_MAX_NAME_LEN) {
 184                 rte_errno = E2BIG;
 185                 return -1;
 186         }
 187         return 0;
 188 }
 189
 190 int __rte_experimental
 191 rte_mp_action_register(const char *name, rte_mp_t action)
 192 {
 193         struct action_entry *entry;
 194
 195         if (validate_action_name(name))
 196                 return -1;
 197
 198         entry = malloc(sizeof(struct action_entry));
 199         if (entry == NULL) {
 200                 rte_errno = ENOMEM;
 201                 return -1;
 202         }
 203         strlcpy(entry->action_name, name, sizeof(entry->action_name));
 204         entry->action = action;
 205
 206         pthread_mutex_lock(&mp_mutex_action);
 207         if (find_action_entry_by_name(name) != NULL) {
 208                 pthread_mutex_unlock(&mp_mutex_action);
 209                 rte_errno = EEXIST;
 210                 free(entry);
 211                 return -1;
 212         }
 213         TAILQ_INSERT_TAIL(&action_entry_list, entry, next);
 214         pthread_mutex_unlock(&mp_mutex_action);
 215         return 0;
 216 }
 217
 218 void __rte_experimental
 219 rte_mp_action_unregister(const char *name)
 220 {
 221         struct action_entry *entry;
 222
 223         if (validate_action_name(name))
 224                 return;
 225
 226         pthread_mutex_lock(&mp_mutex_action);
 227         entry = find_action_entry_by_name(name);
 228         if (entry == NULL) {
 229                 pthread_mutex_unlock(&mp_mutex_action);
 230                 return;
 231         }
 232         TAILQ_REMOVE(&action_entry_list, entry, next);
 233         pthread_mutex_unlock(&mp_mutex_action);
 234         free(entry);
 235 }
 236
 237 static int
 238 read_msg(struct mp_msg_internal *m, struct sockaddr_un *s)
 239 {
 240         int msglen;
 241         struct iovec iov;
 242         struct msghdr msgh;
 243         char control[CMSG_SPACE(sizeof(m->msg.fds))];
 244         struct cmsghdr *cmsg;
 245         int buflen = sizeof(*m) - sizeof(m->msg.fds);
 246
 247         memset(&msgh, 0, sizeof(msgh));
 248         iov.iov_base = m;
 249         iov.iov_len  = buflen;
 250
 251         msgh.msg_name = s;
 252         msgh.msg_namelen = sizeof(*s);
 253         msgh.msg_iov = &iov;
 254         msgh.msg_iovlen = 1;
 255         msgh.msg_control = control;
 256         msgh.msg_controllen = sizeof(control);
 257
 258         msglen = recvmsg(mp_fd, &msgh, 0);
 259         if (msglen < 0) {
 260                 RTE_LOG(ERR, EAL, "recvmsg failed, %s\n", strerror(errno));
 261                 return -1;
 262         }
 263
 264         if (msglen != buflen || (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
 265                 RTE_LOG(ERR, EAL, "truncted msg\n");
 266                 return -1;
 267         }
 268
 269         /* read auxiliary FDs if any */
 270         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 271                 cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 272                 if ((cmsg->cmsg_level == SOL_SOCKET) &&
 273                         (cmsg->cmsg_type == SCM_RIGHTS)) {
 274                         memcpy(m->msg.fds, CMSG_DATA(cmsg), sizeof(m->msg.fds));
 275                         break;
 276                 }
 277         }
 278
 279         return 0;
 280 }
 281
 282 static void
 283 process_msg(struct mp_msg_internal *m, struct sockaddr_un *s)
 284 {
 285         struct pending_request *pending_req;
 286         struct action_entry *entry;
 287         struct rte_mp_msg *msg = &m->msg;
 288         rte_mp_t action = NULL;
 289
 290         RTE_LOG(DEBUG, EAL, "msg: %s\n", msg->name);
 291
 292         if (m->type == MP_REP || m->type == MP_IGN) {
 293                 pthread_mutex_lock(&pending_requests.lock);
 294                 pending_req = find_pending_request(s->sun_path, msg->name);
 295                 if (pending_req) {
 296                         memcpy(pending_req->reply, msg, sizeof(*msg));
 297                         /* -1 indicates that we've been asked to ignore */
 298                         pending_req->reply_received =
 299                                 m->type == MP_REP ? 1 : -1;
 300
 301                         if (pending_req->type == REQUEST_TYPE_SYNC)
 302                                 pthread_cond_signal(&pending_req->sync.cond);
 303                         else if (pending_req->type == REQUEST_TYPE_ASYNC)
 304                                 pthread_cond_signal(
 305                                         &pending_requests.async_cond);
 306                 } else
 307                         RTE_LOG(ERR, EAL, "Drop mp reply: %s\n", msg->name);
 308                 pthread_mutex_unlock(&pending_requests.lock);
 309                 return;
 310         }
 311
 312         pthread_mutex_lock(&mp_mutex_action);
 313         entry = find_action_entry_by_name(msg->name);
 314         if (entry != NULL)
 315                 action = entry->action;
 316         pthread_mutex_unlock(&mp_mutex_action);
 317
 318         if (!action) {
 319                 if (m->type == MP_REQ && !internal_config.init_complete) {
 320                         /* if this is a request, and init is not yet complete,
 321                          * and callback wasn't registered, we should tell the
 322                          * requester to ignore our existence because we're not
 323                          * yet ready to process this request.
 324                          */
 325                         struct rte_mp_msg dummy;
 326
 327                         memset(&dummy, 0, sizeof(dummy));
 328                         strlcpy(dummy.name, msg->name, sizeof(dummy.name));
 329                         mp_send(&dummy, s->sun_path, MP_IGN);
 330                 } else {
 331                         RTE_LOG(ERR, EAL, "Cannot find action: %s\n",
 332                                 msg->name);
 333                 }
 334         } else if (action(msg, s->sun_path) < 0) {
 335                 RTE_LOG(ERR, EAL, "Fail to handle message: %s\n", msg->name);
 336         }
 337 }
 338
 339 static void *
 340 mp_handle(void *arg __rte_unused)
 341 {
 342         struct mp_msg_internal msg;
 343         struct sockaddr_un sa;
 344
 345         while (1) {
 346                 if (read_msg(&msg, &sa) == 0)
 347                         process_msg(&msg, &sa);
 348         }
 349
 350         return NULL;
 351 }
 352
 353 static int
 354 timespec_cmp(const struct timespec *a, const struct timespec *b)
 355 {
 356         if (a->tv_sec < b->tv_sec)
 357                 return -1;
 358         if (a->tv_sec > b->tv_sec)
 359                 return 1;
 360         if (a->tv_nsec < b->tv_nsec)
 361                 return -1;
 362         if (a->tv_nsec > b->tv_nsec)
 363                 return 1;
 364         return 0;
 365 }
 366
 367 enum async_action {
 368         ACTION_NONE, /**< don't do anything */
 369         ACTION_FREE, /**< free the action entry, but don't trigger callback */
 370         ACTION_TRIGGER /**< trigger callback, then free action entry */
 371 };
 372
 373 static enum async_action
 374 process_async_request(struct pending_request *sr, const struct timespec *now)
 375 {
 376         struct async_request_param *param;
 377         struct rte_mp_reply *reply;
 378         bool timeout, received, last_msg;
 379
 380         param = sr->async.param;
 381         reply = &param->user_reply;
 382
 383         /* did we timeout? */
 384         timeout = timespec_cmp(&param->end, now) <= 0;
 385
 386         /* did we receive a response? */
 387         received = sr->reply_received != 0;
 388
 389         /* if we didn't time out, and we didn't receive a response, ignore */
 390         if (!timeout && !received)
 391                 return ACTION_NONE;
 392
 393         /* if we received a response, adjust relevant data and copy mesasge. */
 394         if (sr->reply_received == 1 && sr->reply) {
 395                 struct rte_mp_msg *msg, *user_msgs, *tmp;
 396
 397                 msg = sr->reply;
 398                 user_msgs = reply->msgs;
 399
 400                 tmp = realloc(user_msgs, sizeof(*msg) *
 401                                 (reply->nb_received + 1));
 402                 if (!tmp) {
 403                         RTE_LOG(ERR, EAL, "Fail to alloc reply for request %s:%s\n",
 404                                 sr->dst, sr->request->name);
 405                         /* this entry is going to be removed and its message
 406                          * dropped, but we don't want to leak memory, so
 407                          * continue.
 408                          */
 409                 } else {
 410                         user_msgs = tmp;
 411                         reply->msgs = user_msgs;
 412                         memcpy(&user_msgs[reply->nb_received],
 413                                         msg, sizeof(*msg));
 414                         reply->nb_received++;
 415                 }
 416
 417                 /* mark this request as processed */
 418                 param->n_responses_processed++;
 419         } else if (sr->reply_received == -1) {
 420                 /* we were asked to ignore this process */
 421                 reply->nb_sent--;
 422         } else if (timeout) {
 423                 /* count it as processed response, but don't increment
 424                  * nb_received.
 425                  */
 426                 param->n_responses_processed++;
 427         }
 428
 429         free(sr->reply);
 430
 431         last_msg = param->n_responses_processed == reply->nb_sent;
 432
 433         return last_msg ? ACTION_TRIGGER : ACTION_FREE;
 434 }
 435
 436 static void
 437 trigger_async_action(struct pending_request *sr)
 438 {
 439         struct async_request_param *param;
 440         struct rte_mp_reply *reply;
 441
 442         param = sr->async.param;
 443         reply = &param->user_reply;
 444
 445         param->clb(sr->request, reply);
 446
 447         /* clean up */
 448         free(sr->async.param->user_reply.msgs);
 449         free(sr->async.param);
 450         free(sr->request);
 451 }
 452
 453 static struct pending_request *
 454 check_trigger(struct timespec *ts)
 455 {
 456         struct pending_request *next, *cur, *trigger = NULL;
 457
 458         TAILQ_FOREACH_SAFE(cur, &pending_requests.requests, next, next) {
 459                 enum async_action action;
 460                 if (cur->type != REQUEST_TYPE_ASYNC)
 461                         continue;
 462
 463                 action = process_async_request(cur, ts);
 464                 if (action == ACTION_FREE) {
 465                         TAILQ_REMOVE(&pending_requests.requests, cur, next);
 466                         free(cur);
 467                 } else if (action == ACTION_TRIGGER) {
 468                         TAILQ_REMOVE(&pending_requests.requests, cur, next);
 469                         trigger = cur;
 470                         break;
 471                 }
 472         }
 473         return trigger;
 474 }
 475
 476 static void
 477 wait_for_async_messages(void)
 478 {
 479         struct pending_request *sr;
 480         struct timespec timeout;
 481         bool timedwait = false;
 482         bool nowait = false;
 483         int ret;
 484
 485         /* scan through the list and see if there are any timeouts that
 486          * are earlier than our current timeout.
 487          */
 488         TAILQ_FOREACH(sr, &pending_requests.requests, next) {
 489                 if (sr->type != REQUEST_TYPE_ASYNC)
 490                         continue;
 491                 if (!timedwait || timespec_cmp(&sr->async.param->end,
 492                                 &timeout) < 0) {
 493                         memcpy(&timeout, &sr->async.param->end,
 494                                 sizeof(timeout));
 495                         timedwait = true;
 496                 }
 497
 498                 /* sometimes, we don't even wait */
 499                 if (sr->reply_received) {
 500                         nowait = true;
 501                         break;
 502                 }
 503         }
 504
 505         if (nowait)
 506                 return;
 507
 508         do {
 509                 ret = timedwait ?
 510                         pthread_cond_timedwait(
 511                                 &pending_requests.async_cond,
 512                                 &pending_requests.lock,
 513                                 &timeout) :
 514                         pthread_cond_wait(
 515                                 &pending_requests.async_cond,
 516                                 &pending_requests.lock);
 517         } while (ret != 0 && ret != ETIMEDOUT);
 518
 519         /* we've been woken up or timed out */
 520 }
 521
 522 static void *
 523 async_reply_handle(void *arg __rte_unused)
 524 {
 525         struct timeval now;
 526         struct timespec ts_now;
 527         while (1) {
 528                 struct pending_request *trigger = NULL;
 529
 530                 pthread_mutex_lock(&pending_requests.lock);
 531
 532                 /* we exit this function holding the lock */
 533                 wait_for_async_messages();
 534
 535                 if (gettimeofday(&now, NULL) < 0) {
 536                         pthread_mutex_unlock(&pending_requests.lock);
 537                         RTE_LOG(ERR, EAL, "Cannot get current time\n");
 538                         break;
 539                 }
 540                 ts_now.tv_nsec = now.tv_usec * 1000;
 541                 ts_now.tv_sec = now.tv_sec;
 542
 543                 do {
 544                         trigger = check_trigger(&ts_now);
 545                         /* unlock request list */
 546                         pthread_mutex_unlock(&pending_requests.lock);
 547
 548                         if (trigger) {
 549                                 trigger_async_action(trigger);
 550                                 free(trigger);
 551
 552                                 /* we've triggered a callback, but there may be
 553                                  * more, so lock the list and check again.
 554                                  */
 555                                 pthread_mutex_lock(&pending_requests.lock);
 556                         }
 557                 } while (trigger);
 558         }
 559
 560         RTE_LOG(ERR, EAL, "ERROR: asynchronous requests disabled\n");
 561
 562         return NULL;
 563 }
 564
 565 static int
 566 open_socket_fd(void)
 567 {
 568         char peer_name[PATH_MAX] = {0};
 569         struct sockaddr_un un;
 570
 571         if (rte_eal_process_type() == RTE_PROC_SECONDARY)
 572                 snprintf(peer_name, sizeof(peer_name),
 573                                 "%d_%"PRIx64, getpid(), rte_rdtsc());
 574
 575         mp_fd = socket(AF_UNIX, SOCK_DGRAM, 0);
 576         if (mp_fd < 0) {
 577                 RTE_LOG(ERR, EAL, "failed to create unix socket\n");
 578                 return -1;
 579         }
 580
 581         memset(&un, 0, sizeof(un));
 582         un.sun_family = AF_UNIX;
 583
 584         create_socket_path(peer_name, un.sun_path, sizeof(un.sun_path));
 585
 586         unlink(un.sun_path); /* May still exist since last run */
 587
 588         if (bind(mp_fd, (struct sockaddr *)&un, sizeof(un)) < 0) {
 589                 RTE_LOG(ERR, EAL, "failed to bind %s: %s\n",
 590                         un.sun_path, strerror(errno));
 591                 close(mp_fd);
 592                 return -1;
 593         }
 594
 595         RTE_LOG(INFO, EAL, "Multi-process socket %s\n", un.sun_path);
 596         return mp_fd;
 597 }
 598
 599 static int
 600 unlink_sockets(const char *filter)
 601 {
 602         int dir_fd;
 603         DIR *mp_dir;
 604         struct dirent *ent;
 605
 606         mp_dir = opendir(mp_dir_path);
 607         if (!mp_dir) {
 608                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n", mp_dir_path);
 609                 return -1;
 610         }
 611         dir_fd = dirfd(mp_dir);
 612
 613         while ((ent = readdir(mp_dir))) {
 614                 if (fnmatch(filter, ent->d_name, 0) == 0)
 615                         unlinkat(dir_fd, ent->d_name, 0);
 616         }
 617
 618         closedir(mp_dir);
 619         return 0;
 620 }
 621
 622 int
 623 rte_mp_channel_init(void)
 624 {
 625         char path[PATH_MAX];
 626         int dir_fd;
 627         pthread_t mp_handle_tid, async_reply_handle_tid;
 628
 629         /* create filter path */
 630         create_socket_path("*", path, sizeof(path));
 631         strlcpy(mp_filter, basename(path), sizeof(mp_filter));
 632
 633         /* path may have been modified, so recreate it */
 634         create_socket_path("*", path, sizeof(path));
 635         strlcpy(mp_dir_path, dirname(path), sizeof(mp_dir_path));
 636
 637         /* lock the directory */
 638         dir_fd = open(mp_dir_path, O_RDONLY);
 639         if (dir_fd < 0) {
 640                 RTE_LOG(ERR, EAL, "failed to open %s: %s\n",
 641                         mp_dir_path, strerror(errno));
 642                 return -1;
 643         }
 644
 645         if (flock(dir_fd, LOCK_EX)) {
 646                 RTE_LOG(ERR, EAL, "failed to lock %s: %s\n",
 647                         mp_dir_path, strerror(errno));
 648                 close(dir_fd);
 649                 return -1;
 650         }
 651
 652         if (rte_eal_process_type() == RTE_PROC_PRIMARY &&
 653                         unlink_sockets(mp_filter)) {
 654                 RTE_LOG(ERR, EAL, "failed to unlink mp sockets\n");
 655                 close(dir_fd);
 656                 return -1;
 657         }
 658
 659         if (open_socket_fd() < 0) {
 660                 close(dir_fd);
 661                 return -1;
 662         }
 663
 664         if (rte_ctrl_thread_create(&mp_handle_tid, "rte_mp_handle",
 665                         NULL, mp_handle, NULL) < 0) {
 666                 RTE_LOG(ERR, EAL, "failed to create mp thead: %s\n",
 667                         strerror(errno));
 668                 close(mp_fd);
 669                 close(dir_fd);
 670                 mp_fd = -1;
 671                 return -1;
 672         }
 673
 674         if (rte_ctrl_thread_create(&async_reply_handle_tid,
 675                         "rte_mp_async", NULL,
 676                         async_reply_handle, NULL) < 0) {
 677                 RTE_LOG(ERR, EAL, "failed to create mp thead: %s\n",
 678                         strerror(errno));
 679                 close(mp_fd);
 680                 close(dir_fd);
 681                 mp_fd = -1;
 682                 return -1;
 683         }
 684
 685         /* unlock the directory */
 686         flock(dir_fd, LOCK_UN);
 687         close(dir_fd);
 688
 689         return 0;
 690 }
 691
 692 /**
 693  * Return -1, as fail to send message and it's caused by the local side.
 694  * Return 0, as fail to send message and it's caused by the remote side.
 695  * Return 1, as succeed to send message.
 696  *
 697  */
 698 static int
 699 send_msg(const char *dst_path, struct rte_mp_msg *msg, int type)
 700 {
 701         int snd;
 702         struct iovec iov;
 703         struct msghdr msgh;
 704         struct cmsghdr *cmsg;
 705         struct sockaddr_un dst;
 706         struct mp_msg_internal m;
 707         int fd_size = msg->num_fds * sizeof(int);
 708         char control[CMSG_SPACE(fd_size)];
 709
 710         m.type = type;
 711         memcpy(&m.msg, msg, sizeof(*msg));
 712
 713         memset(&dst, 0, sizeof(dst));
 714         dst.sun_family = AF_UNIX;
 715         strlcpy(dst.sun_path, dst_path, sizeof(dst.sun_path));
 716
 717         memset(&msgh, 0, sizeof(msgh));
 718         memset(control, 0, sizeof(control));
 719
 720         iov.iov_base = &m;
 721         iov.iov_len = sizeof(m) - sizeof(msg->fds);
 722
 723         msgh.msg_name = &dst;
 724         msgh.msg_namelen = sizeof(dst);
 725         msgh.msg_iov = &iov;
 726         msgh.msg_iovlen = 1;
 727         msgh.msg_control = control;
 728         msgh.msg_controllen = sizeof(control);
 729
 730         cmsg = CMSG_FIRSTHDR(&msgh);
 731         cmsg->cmsg_len = CMSG_LEN(fd_size);
 732         cmsg->cmsg_level = SOL_SOCKET;
 733         cmsg->cmsg_type = SCM_RIGHTS;
 734         memcpy(CMSG_DATA(cmsg), msg->fds, fd_size);
 735
 736         do {
 737                 snd = sendmsg(mp_fd, &msgh, 0);
 738         } while (snd < 0 && errno == EINTR);
 739
 740         if (snd < 0) {
 741                 rte_errno = errno;
 742                 /* Check if it caused by peer process exits */
 743                 if (errno == ECONNREFUSED &&
 744                                 rte_eal_process_type() == RTE_PROC_PRIMARY) {
 745                         unlink(dst_path);
 746                         return 0;
 747                 }
 748                 if (errno == ENOBUFS) {
 749                         RTE_LOG(ERR, EAL, "Peer cannot receive message %s\n",
 750                                 dst_path);
 751                         return 0;
 752                 }
 753                 RTE_LOG(ERR, EAL, "failed to send to (%s) due to %s\n",
 754                         dst_path, strerror(errno));
 755                 return -1;
 756         }
 757
 758         return 1;
 759 }
 760
 761 static int
 762 mp_send(struct rte_mp_msg *msg, const char *peer, int type)
 763 {
 764         int dir_fd, ret = 0;
 765         DIR *mp_dir;
 766         struct dirent *ent;
 767
 768         if (!peer && (rte_eal_process_type() == RTE_PROC_SECONDARY))
 769                 peer = eal_mp_socket_path();
 770
 771         if (peer) {
 772                 if (send_msg(peer, msg, type) < 0)
 773                         return -1;
 774                 else
 775                         return 0;
 776         }
 777
 778         /* broadcast to all secondary processes */
 779         mp_dir = opendir(mp_dir_path);
 780         if (!mp_dir) {
 781                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n",
 782                                 mp_dir_path);
 783                 rte_errno = errno;
 784                 return -1;
 785         }
 786
 787         dir_fd = dirfd(mp_dir);
 788         /* lock the directory to prevent processes spinning up while we send */
 789         if (flock(dir_fd, LOCK_EX)) {
 790                 RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
 791                         mp_dir_path);
 792                 rte_errno = errno;
 793                 closedir(mp_dir);
 794                 return -1;
 795         }
 796
 797         while ((ent = readdir(mp_dir))) {
 798                 char path[PATH_MAX];
 799
 800                 if (fnmatch(mp_filter, ent->d_name, 0) != 0)
 801                         continue;
 802
 803                 snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
 804                          ent->d_name);
 805                 if (send_msg(path, msg, type) < 0)
 806                         ret = -1;
 807         }
 808         /* unlock the dir */
 809         flock(dir_fd, LOCK_UN);
 810
 811         /* dir_fd automatically closed on closedir */
 812         closedir(mp_dir);
 813         return ret;
 814 }
 815
 816 static bool
 817 check_input(const struct rte_mp_msg *msg)
 818 {
 819         if (msg == NULL) {
 820                 RTE_LOG(ERR, EAL, "Msg cannot be NULL\n");
 821                 rte_errno = EINVAL;
 822                 return false;
 823         }
 824
 825         if (validate_action_name(msg->name))
 826                 return false;
 827
 828         if (msg->len_param > RTE_MP_MAX_PARAM_LEN) {
 829                 RTE_LOG(ERR, EAL, "Message data is too long\n");
 830                 rte_errno = E2BIG;
 831                 return false;
 832         }
 833
 834         if (msg->num_fds > RTE_MP_MAX_FD_NUM) {
 835                 RTE_LOG(ERR, EAL, "Cannot send more than %d FDs\n",
 836                         RTE_MP_MAX_FD_NUM);
 837                 rte_errno = E2BIG;
 838                 return false;
 839         }
 840
 841         return true;
 842 }
 843
 844 int __rte_experimental
 845 rte_mp_sendmsg(struct rte_mp_msg *msg)
 846 {
 847         if (!check_input(msg))
 848                 return -1;
 849
 850         RTE_LOG(DEBUG, EAL, "sendmsg: %s\n", msg->name);
 851         return mp_send(msg, NULL, MP_MSG);
 852 }
 853
 854 static int
 855 mp_request_async(const char *dst, struct rte_mp_msg *req,
 856                 struct async_request_param *param)
 857 {
 858         struct rte_mp_msg *reply_msg;
 859         struct pending_request *pending_req, *exist;
 860         int ret;
 861
 862         pending_req = calloc(1, sizeof(*pending_req));
 863         reply_msg = calloc(1, sizeof(*reply_msg));
 864         if (pending_req == NULL || reply_msg == NULL) {
 865                 RTE_LOG(ERR, EAL, "Could not allocate space for sync request\n");
 866                 rte_errno = ENOMEM;
 867                 ret = -1;
 868                 goto fail;
 869         }
 870
 871         pending_req->type = REQUEST_TYPE_ASYNC;
 872         strlcpy(pending_req->dst, dst, sizeof(pending_req->dst));
 873         strcpy(pending_req->dst, dst);
 874         pending_req->request = req;
 875         pending_req->reply = reply_msg;
 876         pending_req->async.param = param;
 877
 878         /* queue already locked by caller */
 879
 880         exist = find_pending_request(dst, req->name);
 881         if (exist) {
 882                 RTE_LOG(ERR, EAL, "A pending request %s:%s\n", dst, req->name);
 883                 rte_errno = EEXIST;
 884                 ret = -1;
 885                 goto fail;
 886         }
 887
 888         ret = send_msg(dst, req, MP_REQ);
 889         if (ret < 0) {
 890                 RTE_LOG(ERR, EAL, "Fail to send request %s:%s\n",
 891                         dst, req->name);
 892                 ret = -1;
 893                 goto fail;
 894         } else if (ret == 0) {
 895                 ret = 0;
 896                 goto fail;
 897         }
 898         TAILQ_INSERT_TAIL(&pending_requests.requests, pending_req, next);
 899
 900         param->user_reply.nb_sent++;
 901
 902         return 0;
 903 fail:
 904         free(pending_req);
 905         free(reply_msg);
 906         return ret;
 907 }
 908
 909 static int
 910 mp_request_sync(const char *dst, struct rte_mp_msg *req,
 911                struct rte_mp_reply *reply, const struct timespec *ts)
 912 {
 913         int ret;
 914         struct rte_mp_msg msg, *tmp;
 915         struct pending_request pending_req, *exist;
 916
 917         pending_req.type = REQUEST_TYPE_SYNC;
 918         pending_req.reply_received = 0;
 919         strlcpy(pending_req.dst, dst, sizeof(pending_req.dst));
 920         pending_req.request = req;
 921         pending_req.reply = &msg;
 922         pthread_cond_init(&pending_req.sync.cond, NULL);
 923
 924         exist = find_pending_request(dst, req->name);
 925         if (exist) {
 926                 RTE_LOG(ERR, EAL, "A pending request %s:%s\n", dst, req->name);
 927                 rte_errno = EEXIST;
 928                 return -1;
 929         }
 930
 931         ret = send_msg(dst, req, MP_REQ);
 932         if (ret < 0) {
 933                 RTE_LOG(ERR, EAL, "Fail to send request %s:%s\n",
 934                         dst, req->name);
 935                 return -1;
 936         } else if (ret == 0)
 937                 return 0;
 938
 939         TAILQ_INSERT_TAIL(&pending_requests.requests, &pending_req, next);
 940
 941         reply->nb_sent++;
 942
 943         do {
 944                 ret = pthread_cond_timedwait(&pending_req.sync.cond,
 945                                 &pending_requests.lock, ts);
 946         } while (ret != 0 && ret != ETIMEDOUT);
 947
 948         TAILQ_REMOVE(&pending_requests.requests, &pending_req, next);
 949
 950         if (pending_req.reply_received == 0) {
 951                 RTE_LOG(ERR, EAL, "Fail to recv reply for request %s:%s\n",
 952                         dst, req->name);
 953                 rte_errno = ETIMEDOUT;
 954                 return -1;
 955         }
 956         if (pending_req.reply_received == -1) {
 957                 RTE_LOG(DEBUG, EAL, "Asked to ignore response\n");
 958                 /* not receiving this message is not an error, so decrement
 959                  * number of sent messages
 960                  */
 961                 reply->nb_sent--;
 962                 return 0;
 963         }
 964
 965         tmp = realloc(reply->msgs, sizeof(msg) * (reply->nb_received + 1));
 966         if (!tmp) {
 967                 RTE_LOG(ERR, EAL, "Fail to alloc reply for request %s:%s\n",
 968                         dst, req->name);
 969                 rte_errno = ENOMEM;
 970                 return -1;
 971         }
 972         memcpy(&tmp[reply->nb_received], &msg, sizeof(msg));
 973         reply->msgs = tmp;
 974         reply->nb_received++;
 975         return 0;
 976 }
 977
 978 int __rte_experimental
 979 rte_mp_request_sync(struct rte_mp_msg *req, struct rte_mp_reply *reply,
 980                 const struct timespec *ts)
 981 {
 982         int dir_fd, ret = 0;
 983         DIR *mp_dir;
 984         struct dirent *ent;
 985         struct timeval now;
 986         struct timespec end;
 987
 988         RTE_LOG(DEBUG, EAL, "request: %s\n", req->name);
 989
 990         if (check_input(req) == false)
 991                 return -1;
 992         if (gettimeofday(&now, NULL) < 0) {
 993                 RTE_LOG(ERR, EAL, "Faile to get current time\n");
 994                 rte_errno = errno;
 995                 return -1;
 996         }
 997
 998         end.tv_nsec = (now.tv_usec * 1000 + ts->tv_nsec) % 1000000000;
 999         end.tv_sec = now.tv_sec + ts->tv_sec +
1000                         (now.tv_usec * 1000 + ts->tv_nsec) / 1000000000;
1001
1002         reply->nb_sent = 0;
1003         reply->nb_received = 0;
1004         reply->msgs = NULL;
1005
1006         /* for secondary process, send request to the primary process only */
1007         if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
1008                 pthread_mutex_lock(&pending_requests.lock);
1009                 ret = mp_request_sync(eal_mp_socket_path(), req, reply, &end);
1010                 pthread_mutex_unlock(&pending_requests.lock);
1011                 return ret;
1012         }
1013
1014         /* for primary process, broadcast request, and collect reply 1 by 1 */
1015         mp_dir = opendir(mp_dir_path);
1016         if (!mp_dir) {
1017                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n", mp_dir_path);
1018                 rte_errno = errno;
1019                 return -1;
1020         }
1021
1022         dir_fd = dirfd(mp_dir);
1023         /* lock the directory to prevent processes spinning up while we send */
1024         if (flock(dir_fd, LOCK_EX)) {
1025                 RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
1026                         mp_dir_path);
1027                 closedir(mp_dir);
1028                 rte_errno = errno;
1029                 return -1;
1030         }
1031
1032         pthread_mutex_lock(&pending_requests.lock);
1033         while ((ent = readdir(mp_dir))) {
1034                 char path[PATH_MAX];
1035
1036                 if (fnmatch(mp_filter, ent->d_name, 0) != 0)
1037                         continue;
1038
1039                 snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
1040                          ent->d_name);
1041
1042                 /* unlocks the mutex while waiting for response,
1043                  * locks on receive
1044                  */
1045                 if (mp_request_sync(path, req, reply, &end))
1046                         ret = -1;
1047         }
1048         pthread_mutex_unlock(&pending_requests.lock);
1049         /* unlock the directory */
1050         flock(dir_fd, LOCK_UN);
1051
1052         /* dir_fd automatically closed on closedir */
1053         closedir(mp_dir);
1054         return ret;
1055 }
1056
1057 int __rte_experimental
1058 rte_mp_request_async(struct rte_mp_msg *req, const struct timespec *ts,
1059                 rte_mp_async_reply_t clb)
1060 {
1061         struct rte_mp_msg *copy;
1062         struct pending_request *dummy;
1063         struct async_request_param *param;
1064         struct rte_mp_reply *reply;
1065         int dir_fd, ret = 0;
1066         DIR *mp_dir;
1067         struct dirent *ent;
1068         struct timeval now;
1069         struct timespec *end;
1070         bool dummy_used = false;
1071
1072         RTE_LOG(DEBUG, EAL, "request: %s\n", req->name);
1073
1074         if (check_input(req) == false)
1075                 return -1;
1076         if (gettimeofday(&now, NULL) < 0) {
1077                 RTE_LOG(ERR, EAL, "Faile to get current time\n");
1078                 rte_errno = errno;
1079                 return -1;
1080         }
1081         copy = calloc(1, sizeof(*copy));
1082         dummy = calloc(1, sizeof(*dummy));
1083         param = calloc(1, sizeof(*param));
1084         if (copy == NULL || dummy == NULL || param == NULL) {
1085                 RTE_LOG(ERR, EAL, "Failed to allocate memory for async reply\n");
1086                 rte_errno = ENOMEM;
1087                 goto fail;
1088         }
1089
1090         /* copy message */
1091         memcpy(copy, req, sizeof(*copy));
1092
1093         param->n_responses_processed = 0;
1094         param->clb = clb;
1095         end = &param->end;
1096         reply = &param->user_reply;
1097
1098         end->tv_nsec = (now.tv_usec * 1000 + ts->tv_nsec) % 1000000000;
1099         end->tv_sec = now.tv_sec + ts->tv_sec +
1100                         (now.tv_usec * 1000 + ts->tv_nsec) / 1000000000;
1101         reply->nb_sent = 0;
1102         reply->nb_received = 0;
1103         reply->msgs = NULL;
1104
1105         /* we have to lock the request queue here, as we will be adding a bunch
1106          * of requests to the queue at once, and some of the replies may arrive
1107          * before we add all of the requests to the queue.
1108          */
1109         pthread_mutex_lock(&pending_requests.lock);
1110
1111         /* we have to ensure that callback gets triggered even if we don't send
1112          * anything, therefore earlier we have allocated a dummy request. fill
1113          * it, and put it on the queue if we don't send any requests.
1114          */
1115         dummy->type = REQUEST_TYPE_ASYNC;
1116         dummy->request = copy;
1117         dummy->reply = NULL;
1118         dummy->async.param = param;
1119         dummy->reply_received = 1; /* short-circuit the timeout */
1120
1121         /* for secondary process, send request to the primary process only */
1122         if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
1123                 ret = mp_request_async(eal_mp_socket_path(), copy, param);
1124
1125                 /* if we didn't send anything, put dummy request on the queue */
1126                 if (ret == 0 && reply->nb_sent == 0) {
1127                         TAILQ_INSERT_TAIL(&pending_requests.requests, dummy,
1128                                         next);
1129                         dummy_used = true;
1130                 }
1131
1132                 pthread_mutex_unlock(&pending_requests.lock);
1133
1134                 /* if we couldn't send anything, clean up */
1135                 if (ret != 0)
1136                         goto fail;
1137                 return 0;
1138         }
1139
1140         /* for primary process, broadcast request */
1141         mp_dir = opendir(mp_dir_path);
1142         if (!mp_dir) {
1143                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n", mp_dir_path);
1144                 rte_errno = errno;
1145                 goto unlock_fail;
1146         }
1147         dir_fd = dirfd(mp_dir);
1148
1149         /* lock the directory to prevent processes spinning up while we send */
1150         if (flock(dir_fd, LOCK_EX)) {
1151                 RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
1152                         mp_dir_path);
1153                 rte_errno = errno;
1154                 goto closedir_fail;
1155         }
1156
1157         while ((ent = readdir(mp_dir))) {
1158                 char path[PATH_MAX];
1159
1160                 if (fnmatch(mp_filter, ent->d_name, 0) != 0)
1161                         continue;
1162
1163                 snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
1164                          ent->d_name);
1165
1166                 if (mp_request_async(path, copy, param))
1167                         ret = -1;
1168         }
1169         /* if we didn't send anything, put dummy request on the queue */
1170         if (ret == 0 && reply->nb_sent == 0) {
1171                 TAILQ_INSERT_HEAD(&pending_requests.requests, dummy, next);
1172                 dummy_used = true;
1173         }
1174
1175         /* trigger async request thread wake up */
1176         pthread_cond_signal(&pending_requests.async_cond);
1177
1178         /* finally, unlock the queue */
1179         pthread_mutex_unlock(&pending_requests.lock);
1180
1181         /* unlock the directory */
1182         flock(dir_fd, LOCK_UN);
1183
1184         /* dir_fd automatically closed on closedir */
1185         closedir(mp_dir);
1186
1187         /* if dummy was unused, free it */
1188         if (!dummy_used)
1189                 free(dummy);
1190
1191         return ret;
1192 closedir_fail:
1193         closedir(mp_dir);
1194 unlock_fail:
1195         pthread_mutex_unlock(&pending_requests.lock);
1196 fail:
1197         free(dummy);
1198         free(param);
1199         free(copy);
1200         return -1;
1201 }
1202
1203 int __rte_experimental
1204 rte_mp_reply(struct rte_mp_msg *msg, const char *peer)
1205 {
1206         RTE_LOG(DEBUG, EAL, "reply: %s\n", msg->name);
1207
1208         if (check_input(msg) == false)
1209                 return -1;
1210
1211         if (peer == NULL) {
1212                 RTE_LOG(ERR, EAL, "peer is not specified\n");
1213                 rte_errno = EINVAL;
1214                 return -1;
1215         }
1216
1217         return mp_send(msg, peer, MP_REP);
1218 }