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
  30 #include "eal_private.h"
  31 #include "eal_filesystem.h"
  32 #include "eal_internal_cfg.h"
  33
  34 static int mp_fd = -1;
  35 static char mp_filter[PATH_MAX];   /* Filter for secondary process sockets */
  36 static char mp_dir_path[PATH_MAX]; /* The directory path for all mp sockets */
  37 static pthread_mutex_t mp_mutex_action = PTHREAD_MUTEX_INITIALIZER;
  38
  39 struct action_entry {
  40         TAILQ_ENTRY(action_entry) next;
  41         char action_name[RTE_MP_MAX_NAME_LEN];
  42         rte_mp_t action;
  43 };
  44
  45 /** Double linked list of actions. */
  46 TAILQ_HEAD(action_entry_list, action_entry);
  47
  48 static struct action_entry_list action_entry_list =
  49         TAILQ_HEAD_INITIALIZER(action_entry_list);
  50
  51 enum mp_type {
  52         MP_MSG, /* Share message with peers, will not block */
  53         MP_REQ, /* Request for information, Will block for a reply */
  54         MP_REP, /* Response to previously-received request */
  55         MP_IGN, /* Response telling requester to ignore this response */
  56 };
  57
  58 struct mp_msg_internal {
  59         int type;
  60         struct rte_mp_msg msg;
  61 };
  62
  63 struct sync_request {
  64         TAILQ_ENTRY(sync_request) next;
  65         int reply_received;
  66         char dst[PATH_MAX];
  67         struct rte_mp_msg *request;
  68         struct rte_mp_msg *reply;
  69         pthread_cond_t cond;
  70 };
  71
  72 TAILQ_HEAD(sync_request_list, sync_request);
  73
  74 static struct {
  75         struct sync_request_list requests;
  76         pthread_mutex_t lock;
  77 } sync_requests = {
  78         .requests = TAILQ_HEAD_INITIALIZER(sync_requests.requests),
  79         .lock = PTHREAD_MUTEX_INITIALIZER
  80 };
  81
  82 /* forward declarations */
  83 static int
  84 mp_send(struct rte_mp_msg *msg, const char *peer, int type);
  85
  86
  87 static struct sync_request *
  88 find_sync_request(const char *dst, const char *act_name)
  89 {
  90         struct sync_request *r;
  91
  92         TAILQ_FOREACH(r, &sync_requests.requests, next) {
  93                 if (!strcmp(r->dst, dst) &&
  94                     !strcmp(r->request->name, act_name))
  95                         break;
  96         }
  97
  98         return r;
  99 }
 100
 101 static void
 102 create_socket_path(const char *name, char *buf, int len)
 103 {
 104         const char *prefix = eal_mp_socket_path();
 105
 106         if (strlen(name) > 0)
 107                 snprintf(buf, len, "%s_%s", prefix, name);
 108         else
 109                 snprintf(buf, len, "%s", prefix);
 110 }
 111
 112 int
 113 rte_eal_primary_proc_alive(const char *config_file_path)
 114 {
 115         int config_fd;
 116
 117         if (config_file_path)
 118                 config_fd = open(config_file_path, O_RDONLY);
 119         else {
 120                 const char *path;
 121
 122                 path = eal_runtime_config_path();
 123                 config_fd = open(path, O_RDONLY);
 124         }
 125         if (config_fd < 0)
 126                 return 0;
 127
 128         int ret = lockf(config_fd, F_TEST, 0);
 129         close(config_fd);
 130
 131         return !!ret;
 132 }
 133
 134 static struct action_entry *
 135 find_action_entry_by_name(const char *name)
 136 {
 137         struct action_entry *entry;
 138
 139         TAILQ_FOREACH(entry, &action_entry_list, next) {
 140                 if (strncmp(entry->action_name, name, RTE_MP_MAX_NAME_LEN) == 0)
 141                         break;
 142         }
 143
 144         return entry;
 145 }
 146
 147 static int
 148 validate_action_name(const char *name)
 149 {
 150         if (name == NULL) {
 151                 RTE_LOG(ERR, EAL, "Action name cannot be NULL\n");
 152                 rte_errno = EINVAL;
 153                 return -1;
 154         }
 155         if (strnlen(name, RTE_MP_MAX_NAME_LEN) == 0) {
 156                 RTE_LOG(ERR, EAL, "Length of action name is zero\n");
 157                 rte_errno = EINVAL;
 158                 return -1;
 159         }
 160         if (strnlen(name, RTE_MP_MAX_NAME_LEN) == RTE_MP_MAX_NAME_LEN) {
 161                 rte_errno = E2BIG;
 162                 return -1;
 163         }
 164         return 0;
 165 }
 166
 167 int __rte_experimental
 168 rte_mp_action_register(const char *name, rte_mp_t action)
 169 {
 170         struct action_entry *entry;
 171
 172         if (validate_action_name(name))
 173                 return -1;
 174
 175         entry = malloc(sizeof(struct action_entry));
 176         if (entry == NULL) {
 177                 rte_errno = ENOMEM;
 178                 return -1;
 179         }
 180         strcpy(entry->action_name, name);
 181         entry->action = action;
 182
 183         pthread_mutex_lock(&mp_mutex_action);
 184         if (find_action_entry_by_name(name) != NULL) {
 185                 pthread_mutex_unlock(&mp_mutex_action);
 186                 rte_errno = EEXIST;
 187                 free(entry);
 188                 return -1;
 189         }
 190         TAILQ_INSERT_TAIL(&action_entry_list, entry, next);
 191         pthread_mutex_unlock(&mp_mutex_action);
 192         return 0;
 193 }
 194
 195 void __rte_experimental
 196 rte_mp_action_unregister(const char *name)
 197 {
 198         struct action_entry *entry;
 199
 200         if (validate_action_name(name))
 201                 return;
 202
 203         pthread_mutex_lock(&mp_mutex_action);
 204         entry = find_action_entry_by_name(name);
 205         if (entry == NULL) {
 206                 pthread_mutex_unlock(&mp_mutex_action);
 207                 return;
 208         }
 209         TAILQ_REMOVE(&action_entry_list, entry, next);
 210         pthread_mutex_unlock(&mp_mutex_action);
 211         free(entry);
 212 }
 213
 214 static int
 215 read_msg(struct mp_msg_internal *m, struct sockaddr_un *s)
 216 {
 217         int msglen;
 218         struct iovec iov;
 219         struct msghdr msgh;
 220         char control[CMSG_SPACE(sizeof(m->msg.fds))];
 221         struct cmsghdr *cmsg;
 222         int buflen = sizeof(*m) - sizeof(m->msg.fds);
 223
 224         memset(&msgh, 0, sizeof(msgh));
 225         iov.iov_base = m;
 226         iov.iov_len  = buflen;
 227
 228         msgh.msg_name = s;
 229         msgh.msg_namelen = sizeof(*s);
 230         msgh.msg_iov = &iov;
 231         msgh.msg_iovlen = 1;
 232         msgh.msg_control = control;
 233         msgh.msg_controllen = sizeof(control);
 234
 235         msglen = recvmsg(mp_fd, &msgh, 0);
 236         if (msglen < 0) {
 237                 RTE_LOG(ERR, EAL, "recvmsg failed, %s\n", strerror(errno));
 238                 return -1;
 239         }
 240
 241         if (msglen != buflen || (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
 242                 RTE_LOG(ERR, EAL, "truncted msg\n");
 243                 return -1;
 244         }
 245
 246         /* read auxiliary FDs if any */
 247         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 248                 cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 249                 if ((cmsg->cmsg_level == SOL_SOCKET) &&
 250                         (cmsg->cmsg_type == SCM_RIGHTS)) {
 251                         memcpy(m->msg.fds, CMSG_DATA(cmsg), sizeof(m->msg.fds));
 252                         break;
 253                 }
 254         }
 255
 256         return 0;
 257 }
 258
 259 static void
 260 process_msg(struct mp_msg_internal *m, struct sockaddr_un *s)
 261 {
 262         struct sync_request *sync_req;
 263         struct action_entry *entry;
 264         struct rte_mp_msg *msg = &m->msg;
 265         rte_mp_t action = NULL;
 266
 267         RTE_LOG(DEBUG, EAL, "msg: %s\n", msg->name);
 268
 269         if (m->type == MP_REP || m->type == MP_IGN) {
 270                 pthread_mutex_lock(&sync_requests.lock);
 271                 sync_req = find_sync_request(s->sun_path, msg->name);
 272                 if (sync_req) {
 273                         memcpy(sync_req->reply, msg, sizeof(*msg));
 274                         /* -1 indicates that we've been asked to ignore */
 275                         sync_req->reply_received = m->type == MP_REP ? 1 : -1;
 276                         pthread_cond_signal(&sync_req->cond);
 277                 } else
 278                         RTE_LOG(ERR, EAL, "Drop mp reply: %s\n", msg->name);
 279                 pthread_mutex_unlock(&sync_requests.lock);
 280                 return;
 281         }
 282
 283         pthread_mutex_lock(&mp_mutex_action);
 284         entry = find_action_entry_by_name(msg->name);
 285         if (entry != NULL)
 286                 action = entry->action;
 287         pthread_mutex_unlock(&mp_mutex_action);
 288
 289         if (!action) {
 290                 if (m->type == MP_REQ && !internal_config.init_complete) {
 291                         /* if this is a request, and init is not yet complete,
 292                          * and callback wasn't registered, we should tell the
 293                          * requester to ignore our existence because we're not
 294                          * yet ready to process this request.
 295                          */
 296                         struct rte_mp_msg dummy;
 297                         memset(&dummy, 0, sizeof(dummy));
 298                         mp_send(&dummy, s->sun_path, MP_IGN);
 299                 } else {
 300                         RTE_LOG(ERR, EAL, "Cannot find action: %s\n",
 301                                 msg->name);
 302                 }
 303         } else if (action(msg, s->sun_path) < 0) {
 304                 RTE_LOG(ERR, EAL, "Fail to handle message: %s\n", msg->name);
 305         }
 306 }
 307
 308 static void *
 309 mp_handle(void *arg __rte_unused)
 310 {
 311         struct mp_msg_internal msg;
 312         struct sockaddr_un sa;
 313
 314         while (1) {
 315                 if (read_msg(&msg, &sa) == 0)
 316                         process_msg(&msg, &sa);
 317         }
 318
 319         return NULL;
 320 }
 321
 322 static int
 323 open_socket_fd(void)
 324 {
 325         char peer_name[PATH_MAX] = {0};
 326         struct sockaddr_un un;
 327
 328         if (rte_eal_process_type() == RTE_PROC_SECONDARY)
 329                 snprintf(peer_name, sizeof(peer_name),
 330                                 "%d_%"PRIx64, getpid(), rte_rdtsc());
 331
 332         mp_fd = socket(AF_UNIX, SOCK_DGRAM, 0);
 333         if (mp_fd < 0) {
 334                 RTE_LOG(ERR, EAL, "failed to create unix socket\n");
 335                 return -1;
 336         }
 337
 338         memset(&un, 0, sizeof(un));
 339         un.sun_family = AF_UNIX;
 340
 341         create_socket_path(peer_name, un.sun_path, sizeof(un.sun_path));
 342
 343         unlink(un.sun_path); /* May still exist since last run */
 344
 345         if (bind(mp_fd, (struct sockaddr *)&un, sizeof(un)) < 0) {
 346                 RTE_LOG(ERR, EAL, "failed to bind %s: %s\n",
 347                         un.sun_path, strerror(errno));
 348                 close(mp_fd);
 349                 return -1;
 350         }
 351
 352         RTE_LOG(INFO, EAL, "Multi-process socket %s\n", un.sun_path);
 353         return mp_fd;
 354 }
 355
 356 static int
 357 unlink_sockets(const char *filter)
 358 {
 359         int dir_fd;
 360         DIR *mp_dir;
 361         struct dirent *ent;
 362
 363         mp_dir = opendir(mp_dir_path);
 364         if (!mp_dir) {
 365                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n", mp_dir_path);
 366                 return -1;
 367         }
 368         dir_fd = dirfd(mp_dir);
 369
 370         while ((ent = readdir(mp_dir))) {
 371                 if (fnmatch(filter, ent->d_name, 0) == 0)
 372                         unlinkat(dir_fd, ent->d_name, 0);
 373         }
 374
 375         closedir(mp_dir);
 376         return 0;
 377 }
 378
 379 int
 380 rte_mp_channel_init(void)
 381 {
 382         char thread_name[RTE_MAX_THREAD_NAME_LEN];
 383         char path[PATH_MAX];
 384         int dir_fd;
 385         pthread_t tid;
 386
 387         /* create filter path */
 388         create_socket_path("*", path, sizeof(path));
 389         snprintf(mp_filter, sizeof(mp_filter), "%s", basename(path));
 390
 391         /* path may have been modified, so recreate it */
 392         create_socket_path("*", path, sizeof(path));
 393         snprintf(mp_dir_path, sizeof(mp_dir_path), "%s", dirname(path));
 394
 395         /* lock the directory */
 396         dir_fd = open(mp_dir_path, O_RDONLY);
 397         if (dir_fd < 0) {
 398                 RTE_LOG(ERR, EAL, "failed to open %s: %s\n",
 399                         mp_dir_path, strerror(errno));
 400                 return -1;
 401         }
 402
 403         if (flock(dir_fd, LOCK_EX)) {
 404                 RTE_LOG(ERR, EAL, "failed to lock %s: %s\n",
 405                         mp_dir_path, strerror(errno));
 406                 close(dir_fd);
 407                 return -1;
 408         }
 409
 410         if (rte_eal_process_type() == RTE_PROC_PRIMARY &&
 411                         unlink_sockets(mp_filter)) {
 412                 RTE_LOG(ERR, EAL, "failed to unlink mp sockets\n");
 413                 close(dir_fd);
 414                 return -1;
 415         }
 416
 417         if (open_socket_fd() < 0) {
 418                 close(dir_fd);
 419                 return -1;
 420         }
 421
 422         if (pthread_create(&tid, NULL, mp_handle, NULL) < 0) {
 423                 RTE_LOG(ERR, EAL, "failed to create mp thead: %s\n",
 424                         strerror(errno));
 425                 close(mp_fd);
 426                 close(dir_fd);
 427                 mp_fd = -1;
 428                 return -1;
 429         }
 430
 431         /* try best to set thread name */
 432         snprintf(thread_name, RTE_MAX_THREAD_NAME_LEN, "rte_mp_handle");
 433         rte_thread_setname(tid, thread_name);
 434
 435         /* unlock the directory */
 436         flock(dir_fd, LOCK_UN);
 437         close(dir_fd);
 438
 439         return 0;
 440 }
 441
 442 /**
 443  * Return -1, as fail to send message and it's caused by the local side.
 444  * Return 0, as fail to send message and it's caused by the remote side.
 445  * Return 1, as succeed to send message.
 446  *
 447  */
 448 static int
 449 send_msg(const char *dst_path, struct rte_mp_msg *msg, int type)
 450 {
 451         int snd;
 452         struct iovec iov;
 453         struct msghdr msgh;
 454         struct cmsghdr *cmsg;
 455         struct sockaddr_un dst;
 456         struct mp_msg_internal m;
 457         int fd_size = msg->num_fds * sizeof(int);
 458         char control[CMSG_SPACE(fd_size)];
 459
 460         m.type = type;
 461         memcpy(&m.msg, msg, sizeof(*msg));
 462
 463         memset(&dst, 0, sizeof(dst));
 464         dst.sun_family = AF_UNIX;
 465         snprintf(dst.sun_path, sizeof(dst.sun_path), "%s", dst_path);
 466
 467         memset(&msgh, 0, sizeof(msgh));
 468         memset(control, 0, sizeof(control));
 469
 470         iov.iov_base = &m;
 471         iov.iov_len = sizeof(m) - sizeof(msg->fds);
 472
 473         msgh.msg_name = &dst;
 474         msgh.msg_namelen = sizeof(dst);
 475         msgh.msg_iov = &iov;
 476         msgh.msg_iovlen = 1;
 477         msgh.msg_control = control;
 478         msgh.msg_controllen = sizeof(control);
 479
 480         cmsg = CMSG_FIRSTHDR(&msgh);
 481         cmsg->cmsg_len = CMSG_LEN(fd_size);
 482         cmsg->cmsg_level = SOL_SOCKET;
 483         cmsg->cmsg_type = SCM_RIGHTS;
 484         memcpy(CMSG_DATA(cmsg), msg->fds, fd_size);
 485
 486         do {
 487                 snd = sendmsg(mp_fd, &msgh, 0);
 488         } while (snd < 0 && errno == EINTR);
 489
 490         if (snd < 0) {
 491                 rte_errno = errno;
 492                 /* Check if it caused by peer process exits */
 493                 if (errno == ECONNREFUSED &&
 494                                 rte_eal_process_type() == RTE_PROC_PRIMARY) {
 495                         unlink(dst_path);
 496                         return 0;
 497                 }
 498                 if (errno == ENOBUFS) {
 499                         RTE_LOG(ERR, EAL, "Peer cannot receive message %s\n",
 500                                 dst_path);
 501                         return 0;
 502                 }
 503                 RTE_LOG(ERR, EAL, "failed to send to (%s) due to %s\n",
 504                         dst_path, strerror(errno));
 505                 return -1;
 506         }
 507
 508         return 1;
 509 }
 510
 511 static int
 512 mp_send(struct rte_mp_msg *msg, const char *peer, int type)
 513 {
 514         int dir_fd, ret = 0;
 515         DIR *mp_dir;
 516         struct dirent *ent;
 517
 518         if (!peer && (rte_eal_process_type() == RTE_PROC_SECONDARY))
 519                 peer = eal_mp_socket_path();
 520
 521         if (peer) {
 522                 if (send_msg(peer, msg, type) < 0)
 523                         return -1;
 524                 else
 525                         return 0;
 526         }
 527
 528         /* broadcast to all secondary processes */
 529         mp_dir = opendir(mp_dir_path);
 530         if (!mp_dir) {
 531                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n",
 532                                 mp_dir_path);
 533                 rte_errno = errno;
 534                 return -1;
 535         }
 536
 537         dir_fd = dirfd(mp_dir);
 538         /* lock the directory to prevent processes spinning up while we send */
 539         if (flock(dir_fd, LOCK_EX)) {
 540                 RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
 541                         mp_dir_path);
 542                 rte_errno = errno;
 543                 closedir(mp_dir);
 544                 return -1;
 545         }
 546
 547         while ((ent = readdir(mp_dir))) {
 548                 char path[PATH_MAX];
 549
 550                 if (fnmatch(mp_filter, ent->d_name, 0) != 0)
 551                         continue;
 552
 553                 snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
 554                          ent->d_name);
 555                 if (send_msg(path, msg, type) < 0)
 556                         ret = -1;
 557         }
 558         /* unlock the dir */
 559         flock(dir_fd, LOCK_UN);
 560
 561         /* dir_fd automatically closed on closedir */
 562         closedir(mp_dir);
 563         return ret;
 564 }
 565
 566 static bool
 567 check_input(const struct rte_mp_msg *msg)
 568 {
 569         if (msg == NULL) {
 570                 RTE_LOG(ERR, EAL, "Msg cannot be NULL\n");
 571                 rte_errno = EINVAL;
 572                 return false;
 573         }
 574
 575         if (validate_action_name(msg->name))
 576                 return false;
 577
 578         if (msg->len_param > RTE_MP_MAX_PARAM_LEN) {
 579                 RTE_LOG(ERR, EAL, "Message data is too long\n");
 580                 rte_errno = E2BIG;
 581                 return false;
 582         }
 583
 584         if (msg->num_fds > RTE_MP_MAX_FD_NUM) {
 585                 RTE_LOG(ERR, EAL, "Cannot send more than %d FDs\n",
 586                         RTE_MP_MAX_FD_NUM);
 587                 rte_errno = E2BIG;
 588                 return false;
 589         }
 590
 591         return true;
 592 }
 593
 594 int __rte_experimental
 595 rte_mp_sendmsg(struct rte_mp_msg *msg)
 596 {
 597         if (!check_input(msg))
 598                 return -1;
 599
 600         RTE_LOG(DEBUG, EAL, "sendmsg: %s\n", msg->name);
 601         return mp_send(msg, NULL, MP_MSG);
 602 }
 603
 604 static int
 605 mp_request_one(const char *dst, struct rte_mp_msg *req,
 606                struct rte_mp_reply *reply, const struct timespec *ts)
 607 {
 608         int ret;
 609         struct rte_mp_msg msg, *tmp;
 610         struct sync_request sync_req, *exist;
 611
 612         sync_req.reply_received = 0;
 613         strcpy(sync_req.dst, dst);
 614         sync_req.request = req;
 615         sync_req.reply = &msg;
 616         pthread_cond_init(&sync_req.cond, NULL);
 617
 618         pthread_mutex_lock(&sync_requests.lock);
 619         exist = find_sync_request(dst, req->name);
 620         if (!exist)
 621                 TAILQ_INSERT_TAIL(&sync_requests.requests, &sync_req, next);
 622         if (exist) {
 623                 RTE_LOG(ERR, EAL, "A pending request %s:%s\n", dst, req->name);
 624                 rte_errno = EEXIST;
 625                 pthread_mutex_unlock(&sync_requests.lock);
 626                 return -1;
 627         }
 628
 629         ret = send_msg(dst, req, MP_REQ);
 630         if (ret < 0) {
 631                 RTE_LOG(ERR, EAL, "Fail to send request %s:%s\n",
 632                         dst, req->name);
 633                 return -1;
 634         } else if (ret == 0)
 635                 return 0;
 636
 637         reply->nb_sent++;
 638
 639         do {
 640                 ret = pthread_cond_timedwait(&sync_req.cond,
 641                                 &sync_requests.lock, ts);
 642         } while (ret != 0 && ret != ETIMEDOUT);
 643
 644         /* We got the lock now */
 645         TAILQ_REMOVE(&sync_requests.requests, &sync_req, next);
 646         pthread_mutex_unlock(&sync_requests.lock);
 647
 648         if (sync_req.reply_received == 0) {
 649                 RTE_LOG(ERR, EAL, "Fail to recv reply for request %s:%s\n",
 650                         dst, req->name);
 651                 rte_errno = ETIMEDOUT;
 652                 return -1;
 653         }
 654         if (sync_req.reply_received == -1) {
 655                 RTE_LOG(DEBUG, EAL, "Asked to ignore response\n");
 656                 /* not receiving this message is not an error, so decrement
 657                  * number of sent messages
 658                  */
 659                 reply->nb_sent--;
 660                 return 0;
 661         }
 662
 663         tmp = realloc(reply->msgs, sizeof(msg) * (reply->nb_received + 1));
 664         if (!tmp) {
 665                 RTE_LOG(ERR, EAL, "Fail to alloc reply for request %s:%s\n",
 666                         dst, req->name);
 667                 rte_errno = ENOMEM;
 668                 return -1;
 669         }
 670         memcpy(&tmp[reply->nb_received], &msg, sizeof(msg));
 671         reply->msgs = tmp;
 672         reply->nb_received++;
 673         return 0;
 674 }
 675
 676 int __rte_experimental
 677 rte_mp_request(struct rte_mp_msg *req, struct rte_mp_reply *reply,
 678                 const struct timespec *ts)
 679 {
 680         int dir_fd, ret = 0;
 681         DIR *mp_dir;
 682         struct dirent *ent;
 683         struct timeval now;
 684         struct timespec end;
 685
 686         RTE_LOG(DEBUG, EAL, "request: %s\n", req->name);
 687
 688         if (check_input(req) == false)
 689                 return -1;
 690         if (gettimeofday(&now, NULL) < 0) {
 691                 RTE_LOG(ERR, EAL, "Faile to get current time\n");
 692                 rte_errno = errno;
 693                 return -1;
 694         }
 695
 696         end.tv_nsec = (now.tv_usec * 1000 + ts->tv_nsec) % 1000000000;
 697         end.tv_sec = now.tv_sec + ts->tv_sec +
 698                         (now.tv_usec * 1000 + ts->tv_nsec) / 1000000000;
 699
 700         reply->nb_sent = 0;
 701         reply->nb_received = 0;
 702         reply->msgs = NULL;
 703
 704         /* for secondary process, send request to the primary process only */
 705         if (rte_eal_process_type() == RTE_PROC_SECONDARY)
 706                 return mp_request_one(eal_mp_socket_path(), req, reply, &end);
 707
 708         /* for primary process, broadcast request, and collect reply 1 by 1 */
 709         mp_dir = opendir(mp_dir_path);
 710         if (!mp_dir) {
 711                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n", mp_dir_path);
 712                 rte_errno = errno;
 713                 return -1;
 714         }
 715
 716         dir_fd = dirfd(mp_dir);
 717         /* lock the directory to prevent processes spinning up while we send */
 718         if (flock(dir_fd, LOCK_EX)) {
 719                 RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
 720                         mp_dir_path);
 721                 closedir(mp_dir);
 722                 rte_errno = errno;
 723                 return -1;
 724         }
 725
 726         while ((ent = readdir(mp_dir))) {
 727                 char path[PATH_MAX];
 728
 729                 if (fnmatch(mp_filter, ent->d_name, 0) != 0)
 730                         continue;
 731
 732                 snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
 733                          ent->d_name);
 734
 735                 if (mp_request_one(path, req, reply, &end))
 736                         ret = -1;
 737         }
 738         /* unlock the directory */
 739         flock(dir_fd, LOCK_UN);
 740
 741         /* dir_fd automatically closed on closedir */
 742         closedir(mp_dir);
 743         return ret;
 744 }
 745
 746 int __rte_experimental
 747 rte_mp_reply(struct rte_mp_msg *msg, const char *peer)
 748 {
 749
 750         RTE_LOG(DEBUG, EAL, "reply: %s\n", msg->name);
 751
 752         if (check_input(msg) == false)
 753                 return -1;
 754
 755         if (peer == NULL) {
 756                 RTE_LOG(ERR, EAL, "peer is not specified\n");
 757                 rte_errno = EINVAL;
 758                 return -1;
 759         }
 760
 761         return mp_send(msg, peer, MP_REP);
 762 }