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_alarm.h>
  24 #include <rte_common.h>
  25 #include <rte_cycles.h>
  26 #include <rte_eal.h>
  27 #include <rte_errno.h>
  28 #include <rte_lcore.h>
  29 #include <rte_log.h>
  30 #include <rte_tailq.h>
  31
  32 #include "eal_private.h"
  33 #include "eal_filesystem.h"
  34 #include "eal_internal_cfg.h"
  35
  36 static int mp_fd = -1;
  37 static char mp_filter[PATH_MAX];   /* Filter for secondary process sockets */
  38 static char mp_dir_path[PATH_MAX]; /* The directory path for all mp sockets */
  39 static pthread_mutex_t mp_mutex_action = PTHREAD_MUTEX_INITIALIZER;
  40 static char peer_name[PATH_MAX];
  41
  42 struct action_entry {
  43         TAILQ_ENTRY(action_entry) next;
  44         char action_name[RTE_MP_MAX_NAME_LEN];
  45         rte_mp_t action;
  46 };
  47
  48 /** Double linked list of actions. */
  49 TAILQ_HEAD(action_entry_list, action_entry);
  50
  51 static struct action_entry_list action_entry_list =
  52         TAILQ_HEAD_INITIALIZER(action_entry_list);
  53
  54 enum mp_type {
  55         MP_MSG, /* Share message with peers, will not block */
  56         MP_REQ, /* Request for information, Will block for a reply */
  57         MP_REP, /* Response to previously-received request */
  58         MP_IGN, /* Response telling requester to ignore this response */
  59 };
  60
  61 struct mp_msg_internal {
  62         int type;
  63         struct rte_mp_msg msg;
  64 };
  65
  66 struct async_request_param {
  67         rte_mp_async_reply_t clb;
  68         struct rte_mp_reply user_reply;
  69         struct timespec end;
  70         int n_responses_processed;
  71 };
  72
  73 struct pending_request {
  74         TAILQ_ENTRY(pending_request) next;
  75         enum {
  76                 REQUEST_TYPE_SYNC,
  77                 REQUEST_TYPE_ASYNC
  78         } type;
  79         char dst[PATH_MAX];
  80         struct rte_mp_msg *request;
  81         struct rte_mp_msg *reply;
  82         int reply_received;
  83         RTE_STD_C11
  84         union {
  85                 struct {
  86                         struct async_request_param *param;
  87                 } async;
  88                 struct {
  89                         pthread_cond_t cond;
  90                 } sync;
  91         };
  92 };
  93
  94 TAILQ_HEAD(pending_request_list, pending_request);
  95
  96 static struct {
  97         struct pending_request_list requests;
  98         pthread_mutex_t lock;
  99 } pending_requests = {
 100         .requests = TAILQ_HEAD_INITIALIZER(pending_requests.requests),
 101         .lock = PTHREAD_MUTEX_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 /* for use with alarm callback */
 110 static void
 111 async_reply_handle(void *arg);
 112
 113 /* for use with process_msg */
 114 static struct pending_request *
 115 async_reply_handle_thread_unsafe(void *arg);
 116
 117 static void
 118 trigger_async_action(struct pending_request *req);
 119
 120 static struct pending_request *
 121 find_pending_request(const char *dst, const char *act_name)
 122 {
 123         struct pending_request *r;
 124
 125         TAILQ_FOREACH(r, &pending_requests.requests, next) {
 126                 if (!strcmp(r->dst, dst) &&
 127                     !strcmp(r->request->name, act_name))
 128                         break;
 129         }
 130
 131         return r;
 132 }
 133
 134 static void
 135 create_socket_path(const char *name, char *buf, int len)
 136 {
 137         const char *prefix = eal_mp_socket_path();
 138
 139         if (strlen(name) > 0)
 140                 snprintf(buf, len, "%s_%s", prefix, name);
 141         else
 142                 strlcpy(buf, prefix, len);
 143 }
 144
 145 int
 146 rte_eal_primary_proc_alive(const char *config_file_path)
 147 {
 148         int config_fd;
 149
 150         if (config_file_path)
 151                 config_fd = open(config_file_path, O_RDONLY);
 152         else {
 153                 const char *path;
 154
 155                 path = eal_runtime_config_path();
 156                 config_fd = open(path, O_RDONLY);
 157         }
 158         if (config_fd < 0)
 159                 return 0;
 160
 161         int ret = lockf(config_fd, F_TEST, 0);
 162         close(config_fd);
 163
 164         return !!ret;
 165 }
 166
 167 static struct action_entry *
 168 find_action_entry_by_name(const char *name)
 169 {
 170         struct action_entry *entry;
 171
 172         TAILQ_FOREACH(entry, &action_entry_list, next) {
 173                 if (strncmp(entry->action_name, name, RTE_MP_MAX_NAME_LEN) == 0)
 174                         break;
 175         }
 176
 177         return entry;
 178 }
 179
 180 static int
 181 validate_action_name(const char *name)
 182 {
 183         if (name == NULL) {
 184                 RTE_LOG(ERR, EAL, "Action name cannot be NULL\n");
 185                 rte_errno = EINVAL;
 186                 return -1;
 187         }
 188         if (strnlen(name, RTE_MP_MAX_NAME_LEN) == 0) {
 189                 RTE_LOG(ERR, EAL, "Length of action name is zero\n");
 190                 rte_errno = EINVAL;
 191                 return -1;
 192         }
 193         if (strnlen(name, RTE_MP_MAX_NAME_LEN) == RTE_MP_MAX_NAME_LEN) {
 194                 rte_errno = E2BIG;
 195                 return -1;
 196         }
 197         return 0;
 198 }
 199
 200 int __rte_experimental
 201 rte_mp_action_register(const char *name, rte_mp_t action)
 202 {
 203         struct action_entry *entry;
 204
 205         if (validate_action_name(name))
 206                 return -1;
 207
 208         entry = malloc(sizeof(struct action_entry));
 209         if (entry == NULL) {
 210                 rte_errno = ENOMEM;
 211                 return -1;
 212         }
 213         strlcpy(entry->action_name, name, sizeof(entry->action_name));
 214         entry->action = action;
 215
 216         pthread_mutex_lock(&mp_mutex_action);
 217         if (find_action_entry_by_name(name) != NULL) {
 218                 pthread_mutex_unlock(&mp_mutex_action);
 219                 rte_errno = EEXIST;
 220                 free(entry);
 221                 return -1;
 222         }
 223         TAILQ_INSERT_TAIL(&action_entry_list, entry, next);
 224         pthread_mutex_unlock(&mp_mutex_action);
 225         return 0;
 226 }
 227
 228 void __rte_experimental
 229 rte_mp_action_unregister(const char *name)
 230 {
 231         struct action_entry *entry;
 232
 233         if (validate_action_name(name))
 234                 return;
 235
 236         pthread_mutex_lock(&mp_mutex_action);
 237         entry = find_action_entry_by_name(name);
 238         if (entry == NULL) {
 239                 pthread_mutex_unlock(&mp_mutex_action);
 240                 return;
 241         }
 242         TAILQ_REMOVE(&action_entry_list, entry, next);
 243         pthread_mutex_unlock(&mp_mutex_action);
 244         free(entry);
 245 }
 246
 247 static int
 248 read_msg(struct mp_msg_internal *m, struct sockaddr_un *s)
 249 {
 250         int msglen;
 251         struct iovec iov;
 252         struct msghdr msgh;
 253         char control[CMSG_SPACE(sizeof(m->msg.fds))];
 254         struct cmsghdr *cmsg;
 255         int buflen = sizeof(*m) - sizeof(m->msg.fds);
 256
 257         memset(&msgh, 0, sizeof(msgh));
 258         iov.iov_base = m;
 259         iov.iov_len  = buflen;
 260
 261         msgh.msg_name = s;
 262         msgh.msg_namelen = sizeof(*s);
 263         msgh.msg_iov = &iov;
 264         msgh.msg_iovlen = 1;
 265         msgh.msg_control = control;
 266         msgh.msg_controllen = sizeof(control);
 267
 268         msglen = recvmsg(mp_fd, &msgh, 0);
 269         if (msglen < 0) {
 270                 RTE_LOG(ERR, EAL, "recvmsg failed, %s\n", strerror(errno));
 271                 return -1;
 272         }
 273
 274         if (msglen != buflen || (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
 275                 RTE_LOG(ERR, EAL, "truncted msg\n");
 276                 return -1;
 277         }
 278
 279         /* read auxiliary FDs if any */
 280         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 281                 cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 282                 if ((cmsg->cmsg_level == SOL_SOCKET) &&
 283                         (cmsg->cmsg_type == SCM_RIGHTS)) {
 284                         memcpy(m->msg.fds, CMSG_DATA(cmsg), sizeof(m->msg.fds));
 285                         break;
 286                 }
 287         }
 288
 289         return 0;
 290 }
 291
 292 static void
 293 process_msg(struct mp_msg_internal *m, struct sockaddr_un *s)
 294 {
 295         struct pending_request *pending_req;
 296         struct action_entry *entry;
 297         struct rte_mp_msg *msg = &m->msg;
 298         rte_mp_t action = NULL;
 299
 300         RTE_LOG(DEBUG, EAL, "msg: %s\n", msg->name);
 301
 302         if (m->type == MP_REP || m->type == MP_IGN) {
 303                 struct pending_request *req = NULL;
 304
 305                 pthread_mutex_lock(&pending_requests.lock);
 306                 pending_req = find_pending_request(s->sun_path, msg->name);
 307                 if (pending_req) {
 308                         memcpy(pending_req->reply, msg, sizeof(*msg));
 309                         /* -1 indicates that we've been asked to ignore */
 310                         pending_req->reply_received =
 311                                 m->type == MP_REP ? 1 : -1;
 312
 313                         if (pending_req->type == REQUEST_TYPE_SYNC)
 314                                 pthread_cond_signal(&pending_req->sync.cond);
 315                         else if (pending_req->type == REQUEST_TYPE_ASYNC)
 316                                 req = async_reply_handle_thread_unsafe(
 317                                                 pending_req);
 318                 } else
 319                         RTE_LOG(ERR, EAL, "Drop mp reply: %s\n", msg->name);
 320                 pthread_mutex_unlock(&pending_requests.lock);
 321
 322                 if (req != NULL)
 323                         trigger_async_action(req);
 324                 return;
 325         }
 326
 327         pthread_mutex_lock(&mp_mutex_action);
 328         entry = find_action_entry_by_name(msg->name);
 329         if (entry != NULL)
 330                 action = entry->action;
 331         pthread_mutex_unlock(&mp_mutex_action);
 332
 333         if (!action) {
 334                 if (m->type == MP_REQ && !internal_config.init_complete) {
 335                         /* if this is a request, and init is not yet complete,
 336                          * and callback wasn't registered, we should tell the
 337                          * requester to ignore our existence because we're not
 338                          * yet ready to process this request.
 339                          */
 340                         struct rte_mp_msg dummy;
 341
 342                         memset(&dummy, 0, sizeof(dummy));
 343                         strlcpy(dummy.name, msg->name, sizeof(dummy.name));
 344                         mp_send(&dummy, s->sun_path, MP_IGN);
 345                 } else {
 346                         RTE_LOG(ERR, EAL, "Cannot find action: %s\n",
 347                                 msg->name);
 348                 }
 349         } else if (action(msg, s->sun_path) < 0) {
 350                 RTE_LOG(ERR, EAL, "Fail to handle message: %s\n", msg->name);
 351         }
 352 }
 353
 354 static void *
 355 mp_handle(void *arg __rte_unused)
 356 {
 357         struct mp_msg_internal msg;
 358         struct sockaddr_un sa;
 359
 360         while (1) {
 361                 if (read_msg(&msg, &sa) == 0)
 362                         process_msg(&msg, &sa);
 363         }
 364
 365         return NULL;
 366 }
 367
 368 static int
 369 timespec_cmp(const struct timespec *a, const struct timespec *b)
 370 {
 371         if (a->tv_sec < b->tv_sec)
 372                 return -1;
 373         if (a->tv_sec > b->tv_sec)
 374                 return 1;
 375         if (a->tv_nsec < b->tv_nsec)
 376                 return -1;
 377         if (a->tv_nsec > b->tv_nsec)
 378                 return 1;
 379         return 0;
 380 }
 381
 382 enum async_action {
 383         ACTION_FREE, /**< free the action entry, but don't trigger callback */
 384         ACTION_TRIGGER /**< trigger callback, then free action entry */
 385 };
 386
 387 static enum async_action
 388 process_async_request(struct pending_request *sr, const struct timespec *now)
 389 {
 390         struct async_request_param *param;
 391         struct rte_mp_reply *reply;
 392         bool timeout, last_msg;
 393
 394         param = sr->async.param;
 395         reply = &param->user_reply;
 396
 397         /* did we timeout? */
 398         timeout = timespec_cmp(&param->end, now) <= 0;
 399
 400         /* if we received a response, adjust relevant data and copy mesasge. */
 401         if (sr->reply_received == 1 && sr->reply) {
 402                 struct rte_mp_msg *msg, *user_msgs, *tmp;
 403
 404                 msg = sr->reply;
 405                 user_msgs = reply->msgs;
 406
 407                 tmp = realloc(user_msgs, sizeof(*msg) *
 408                                 (reply->nb_received + 1));
 409                 if (!tmp) {
 410                         RTE_LOG(ERR, EAL, "Fail to alloc reply for request %s:%s\n",
 411                                 sr->dst, sr->request->name);
 412                         /* this entry is going to be removed and its message
 413                          * dropped, but we don't want to leak memory, so
 414                          * continue.
 415                          */
 416                 } else {
 417                         user_msgs = tmp;
 418                         reply->msgs = user_msgs;
 419                         memcpy(&user_msgs[reply->nb_received],
 420                                         msg, sizeof(*msg));
 421                         reply->nb_received++;
 422                 }
 423
 424                 /* mark this request as processed */
 425                 param->n_responses_processed++;
 426         } else if (sr->reply_received == -1) {
 427                 /* we were asked to ignore this process */
 428                 reply->nb_sent--;
 429         } else if (timeout) {
 430                 /* count it as processed response, but don't increment
 431                  * nb_received.
 432                  */
 433                 param->n_responses_processed++;
 434         }
 435
 436         free(sr->reply);
 437
 438         last_msg = param->n_responses_processed == reply->nb_sent;
 439
 440         return last_msg ? ACTION_TRIGGER : ACTION_FREE;
 441 }
 442
 443 static void
 444 trigger_async_action(struct pending_request *sr)
 445 {
 446         struct async_request_param *param;
 447         struct rte_mp_reply *reply;
 448
 449         param = sr->async.param;
 450         reply = &param->user_reply;
 451
 452         param->clb(sr->request, reply);
 453
 454         /* clean up */
 455         free(sr->async.param->user_reply.msgs);
 456         free(sr->async.param);
 457         free(sr->request);
 458         free(sr);
 459 }
 460
 461 static struct pending_request *
 462 async_reply_handle_thread_unsafe(void *arg)
 463 {
 464         struct pending_request *req = (struct pending_request *)arg;
 465         enum async_action action;
 466         struct timespec ts_now;
 467         struct timeval now;
 468
 469         if (gettimeofday(&now, NULL) < 0) {
 470                 RTE_LOG(ERR, EAL, "Cannot get current time\n");
 471                 goto no_trigger;
 472         }
 473         ts_now.tv_nsec = now.tv_usec * 1000;
 474         ts_now.tv_sec = now.tv_sec;
 475
 476         action = process_async_request(req, &ts_now);
 477
 478         TAILQ_REMOVE(&pending_requests.requests, req, next);
 479
 480         if (rte_eal_alarm_cancel(async_reply_handle, req) < 0) {
 481                 /* if we failed to cancel the alarm because it's already in
 482                  * progress, don't proceed because otherwise we will end up
 483                  * handling the same message twice.
 484                  */
 485                 if (rte_errno == EINPROGRESS) {
 486                         RTE_LOG(DEBUG, EAL, "Request handling is already in progress\n");
 487                         goto no_trigger;
 488                 }
 489                 RTE_LOG(ERR, EAL, "Failed to cancel alarm\n");
 490         }
 491
 492         if (action == ACTION_TRIGGER)
 493                 return req;
 494 no_trigger:
 495         free(req);
 496         return NULL;
 497 }
 498
 499 static void
 500 async_reply_handle(void *arg)
 501 {
 502         struct pending_request *req;
 503
 504         pthread_mutex_lock(&pending_requests.lock);
 505         req = async_reply_handle_thread_unsafe(arg);
 506         pthread_mutex_unlock(&pending_requests.lock);
 507
 508         if (req != NULL)
 509                 trigger_async_action(req);
 510 }
 511
 512 static int
 513 open_socket_fd(void)
 514 {
 515         struct sockaddr_un un;
 516
 517         peer_name[0] = '\0';
 518         if (rte_eal_process_type() == RTE_PROC_SECONDARY)
 519                 snprintf(peer_name, sizeof(peer_name),
 520                                 "%d_%"PRIx64, getpid(), rte_rdtsc());
 521
 522         mp_fd = socket(AF_UNIX, SOCK_DGRAM, 0);
 523         if (mp_fd < 0) {
 524                 RTE_LOG(ERR, EAL, "failed to create unix socket\n");
 525                 return -1;
 526         }
 527
 528         memset(&un, 0, sizeof(un));
 529         un.sun_family = AF_UNIX;
 530
 531         create_socket_path(peer_name, un.sun_path, sizeof(un.sun_path));
 532
 533         unlink(un.sun_path); /* May still exist since last run */
 534
 535         if (bind(mp_fd, (struct sockaddr *)&un, sizeof(un)) < 0) {
 536                 RTE_LOG(ERR, EAL, "failed to bind %s: %s\n",
 537                         un.sun_path, strerror(errno));
 538                 close(mp_fd);
 539                 return -1;
 540         }
 541
 542         RTE_LOG(INFO, EAL, "Multi-process socket %s\n", un.sun_path);
 543         return mp_fd;
 544 }
 545
 546 static void
 547 close_socket_fd(void)
 548 {
 549         char path[PATH_MAX];
 550
 551         if (mp_fd < 0)
 552                 return;
 553
 554         close(mp_fd);
 555         create_socket_path(peer_name, path, sizeof(path));
 556         unlink(path);
 557 }
 558
 559 int
 560 rte_mp_channel_init(void)
 561 {
 562         char path[PATH_MAX];
 563         int dir_fd;
 564         pthread_t mp_handle_tid;
 565
 566         /* in no shared files mode, we do not have secondary processes support,
 567          * so no need to initialize IPC.
 568          */
 569         if (internal_config.no_shconf) {
 570                 RTE_LOG(DEBUG, EAL, "No shared files mode enabled, IPC will be disabled\n");
 571                 return 0;
 572         }
 573
 574         /* create filter path */
 575         create_socket_path("*", path, sizeof(path));
 576         strlcpy(mp_filter, basename(path), sizeof(mp_filter));
 577
 578         /* path may have been modified, so recreate it */
 579         create_socket_path("*", path, sizeof(path));
 580         strlcpy(mp_dir_path, dirname(path), sizeof(mp_dir_path));
 581
 582         /* lock the directory */
 583         dir_fd = open(mp_dir_path, O_RDONLY);
 584         if (dir_fd < 0) {
 585                 RTE_LOG(ERR, EAL, "failed to open %s: %s\n",
 586                         mp_dir_path, strerror(errno));
 587                 return -1;
 588         }
 589
 590         if (flock(dir_fd, LOCK_EX)) {
 591                 RTE_LOG(ERR, EAL, "failed to lock %s: %s\n",
 592                         mp_dir_path, strerror(errno));
 593                 close(dir_fd);
 594                 return -1;
 595         }
 596
 597         if (open_socket_fd() < 0) {
 598                 close(dir_fd);
 599                 return -1;
 600         }
 601
 602         if (rte_ctrl_thread_create(&mp_handle_tid, "rte_mp_handle",
 603                         NULL, mp_handle, NULL) < 0) {
 604                 RTE_LOG(ERR, EAL, "failed to create mp thead: %s\n",
 605                         strerror(errno));
 606                 close(mp_fd);
 607                 close(dir_fd);
 608                 mp_fd = -1;
 609                 return -1;
 610         }
 611
 612         /* unlock the directory */
 613         flock(dir_fd, LOCK_UN);
 614         close(dir_fd);
 615
 616         return 0;
 617 }
 618
 619 void
 620 rte_mp_channel_cleanup(void)
 621 {
 622         close_socket_fd();
 623 }
 624
 625 /**
 626  * Return -1, as fail to send message and it's caused by the local side.
 627  * Return 0, as fail to send message and it's caused by the remote side.
 628  * Return 1, as succeed to send message.
 629  *
 630  */
 631 static int
 632 send_msg(const char *dst_path, struct rte_mp_msg *msg, int type)
 633 {
 634         int snd;
 635         struct iovec iov;
 636         struct msghdr msgh;
 637         struct cmsghdr *cmsg;
 638         struct sockaddr_un dst;
 639         struct mp_msg_internal m;
 640         int fd_size = msg->num_fds * sizeof(int);
 641         char control[CMSG_SPACE(fd_size)];
 642
 643         m.type = type;
 644         memcpy(&m.msg, msg, sizeof(*msg));
 645
 646         memset(&dst, 0, sizeof(dst));
 647         dst.sun_family = AF_UNIX;
 648         strlcpy(dst.sun_path, dst_path, sizeof(dst.sun_path));
 649
 650         memset(&msgh, 0, sizeof(msgh));
 651         memset(control, 0, sizeof(control));
 652
 653         iov.iov_base = &m;
 654         iov.iov_len = sizeof(m) - sizeof(msg->fds);
 655
 656         msgh.msg_name = &dst;
 657         msgh.msg_namelen = sizeof(dst);
 658         msgh.msg_iov = &iov;
 659         msgh.msg_iovlen = 1;
 660         msgh.msg_control = control;
 661         msgh.msg_controllen = sizeof(control);
 662
 663         cmsg = CMSG_FIRSTHDR(&msgh);
 664         cmsg->cmsg_len = CMSG_LEN(fd_size);
 665         cmsg->cmsg_level = SOL_SOCKET;
 666         cmsg->cmsg_type = SCM_RIGHTS;
 667         memcpy(CMSG_DATA(cmsg), msg->fds, fd_size);
 668
 669         do {
 670                 snd = sendmsg(mp_fd, &msgh, 0);
 671         } while (snd < 0 && errno == EINTR);
 672
 673         if (snd < 0) {
 674                 rte_errno = errno;
 675                 /* Check if it caused by peer process exits */
 676                 if (errno == ECONNREFUSED &&
 677                                 rte_eal_process_type() == RTE_PROC_PRIMARY) {
 678                         unlink(dst_path);
 679                         return 0;
 680                 }
 681                 RTE_LOG(ERR, EAL, "failed to send to (%s) due to %s\n",
 682                         dst_path, strerror(errno));
 683                 return -1;
 684         }
 685
 686         return 1;
 687 }
 688
 689 static int
 690 mp_send(struct rte_mp_msg *msg, const char *peer, int type)
 691 {
 692         int dir_fd, ret = 0;
 693         DIR *mp_dir;
 694         struct dirent *ent;
 695
 696         if (!peer && (rte_eal_process_type() == RTE_PROC_SECONDARY))
 697                 peer = eal_mp_socket_path();
 698
 699         if (peer) {
 700                 if (send_msg(peer, msg, type) < 0)
 701                         return -1;
 702                 else
 703                         return 0;
 704         }
 705
 706         /* broadcast to all secondary processes */
 707         mp_dir = opendir(mp_dir_path);
 708         if (!mp_dir) {
 709                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n",
 710                                 mp_dir_path);
 711                 rte_errno = errno;
 712                 return -1;
 713         }
 714
 715         dir_fd = dirfd(mp_dir);
 716         /* lock the directory to prevent processes spinning up while we send */
 717         if (flock(dir_fd, LOCK_SH)) {
 718                 RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
 719                         mp_dir_path);
 720                 rte_errno = errno;
 721                 closedir(mp_dir);
 722                 return -1;
 723         }
 724
 725         while ((ent = readdir(mp_dir))) {
 726                 char path[PATH_MAX];
 727
 728                 if (fnmatch(mp_filter, ent->d_name, 0) != 0)
 729                         continue;
 730
 731                 snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
 732                          ent->d_name);
 733                 if (send_msg(path, msg, type) < 0)
 734                         ret = -1;
 735         }
 736         /* unlock the dir */
 737         flock(dir_fd, LOCK_UN);
 738
 739         /* dir_fd automatically closed on closedir */
 740         closedir(mp_dir);
 741         return ret;
 742 }
 743
 744 static bool
 745 check_input(const struct rte_mp_msg *msg)
 746 {
 747         if (msg == NULL) {
 748                 RTE_LOG(ERR, EAL, "Msg cannot be NULL\n");
 749                 rte_errno = EINVAL;
 750                 return false;
 751         }
 752
 753         if (validate_action_name(msg->name))
 754                 return false;
 755
 756         if (msg->len_param > RTE_MP_MAX_PARAM_LEN) {
 757                 RTE_LOG(ERR, EAL, "Message data is too long\n");
 758                 rte_errno = E2BIG;
 759                 return false;
 760         }
 761
 762         if (msg->num_fds > RTE_MP_MAX_FD_NUM) {
 763                 RTE_LOG(ERR, EAL, "Cannot send more than %d FDs\n",
 764                         RTE_MP_MAX_FD_NUM);
 765                 rte_errno = E2BIG;
 766                 return false;
 767         }
 768
 769         return true;
 770 }
 771
 772 int __rte_experimental
 773 rte_mp_sendmsg(struct rte_mp_msg *msg)
 774 {
 775         if (!check_input(msg))
 776                 return -1;
 777
 778         RTE_LOG(DEBUG, EAL, "sendmsg: %s\n", msg->name);
 779         return mp_send(msg, NULL, MP_MSG);
 780 }
 781
 782 static int
 783 mp_request_async(const char *dst, struct rte_mp_msg *req,
 784                 struct async_request_param *param, const struct timespec *ts)
 785 {
 786         struct rte_mp_msg *reply_msg;
 787         struct pending_request *pending_req, *exist;
 788         int ret = -1;
 789
 790         pending_req = calloc(1, sizeof(*pending_req));
 791         reply_msg = calloc(1, sizeof(*reply_msg));
 792         if (pending_req == NULL || reply_msg == NULL) {
 793                 RTE_LOG(ERR, EAL, "Could not allocate space for sync request\n");
 794                 rte_errno = ENOMEM;
 795                 ret = -1;
 796                 goto fail;
 797         }
 798
 799         pending_req->type = REQUEST_TYPE_ASYNC;
 800         strlcpy(pending_req->dst, dst, sizeof(pending_req->dst));
 801         pending_req->request = req;
 802         pending_req->reply = reply_msg;
 803         pending_req->async.param = param;
 804
 805         /* queue already locked by caller */
 806
 807         exist = find_pending_request(dst, req->name);
 808         if (exist) {
 809                 RTE_LOG(ERR, EAL, "A pending request %s:%s\n", dst, req->name);
 810                 rte_errno = EEXIST;
 811                 ret = -1;
 812                 goto fail;
 813         }
 814
 815         ret = send_msg(dst, req, MP_REQ);
 816         if (ret < 0) {
 817                 RTE_LOG(ERR, EAL, "Fail to send request %s:%s\n",
 818                         dst, req->name);
 819                 ret = -1;
 820                 goto fail;
 821         } else if (ret == 0) {
 822                 ret = 0;
 823                 goto fail;
 824         }
 825         param->user_reply.nb_sent++;
 826
 827         /* if alarm set fails, we simply ignore the reply */
 828         if (rte_eal_alarm_set(ts->tv_sec * 1000000 + ts->tv_nsec / 1000,
 829                               async_reply_handle, pending_req) < 0) {
 830                 RTE_LOG(ERR, EAL, "Fail to set alarm for request %s:%s\n",
 831                         dst, req->name);
 832                 ret = -1;
 833                 goto fail;
 834         }
 835         TAILQ_INSERT_TAIL(&pending_requests.requests, pending_req, next);
 836
 837         return 0;
 838 fail:
 839         free(pending_req);
 840         free(reply_msg);
 841         return ret;
 842 }
 843
 844 static int
 845 mp_request_sync(const char *dst, struct rte_mp_msg *req,
 846                struct rte_mp_reply *reply, const struct timespec *ts)
 847 {
 848         int ret;
 849         struct rte_mp_msg msg, *tmp;
 850         struct pending_request pending_req, *exist;
 851
 852         pending_req.type = REQUEST_TYPE_SYNC;
 853         pending_req.reply_received = 0;
 854         strlcpy(pending_req.dst, dst, sizeof(pending_req.dst));
 855         pending_req.request = req;
 856         pending_req.reply = &msg;
 857         pthread_cond_init(&pending_req.sync.cond, NULL);
 858
 859         exist = find_pending_request(dst, req->name);
 860         if (exist) {
 861                 RTE_LOG(ERR, EAL, "A pending request %s:%s\n", dst, req->name);
 862                 rte_errno = EEXIST;
 863                 return -1;
 864         }
 865
 866         ret = send_msg(dst, req, MP_REQ);
 867         if (ret < 0) {
 868                 RTE_LOG(ERR, EAL, "Fail to send request %s:%s\n",
 869                         dst, req->name);
 870                 return -1;
 871         } else if (ret == 0)
 872                 return 0;
 873
 874         TAILQ_INSERT_TAIL(&pending_requests.requests, &pending_req, next);
 875
 876         reply->nb_sent++;
 877
 878         do {
 879                 ret = pthread_cond_timedwait(&pending_req.sync.cond,
 880                                 &pending_requests.lock, ts);
 881         } while (ret != 0 && ret != ETIMEDOUT);
 882
 883         TAILQ_REMOVE(&pending_requests.requests, &pending_req, next);
 884
 885         if (pending_req.reply_received == 0) {
 886                 RTE_LOG(ERR, EAL, "Fail to recv reply for request %s:%s\n",
 887                         dst, req->name);
 888                 rte_errno = ETIMEDOUT;
 889                 return -1;
 890         }
 891         if (pending_req.reply_received == -1) {
 892                 RTE_LOG(DEBUG, EAL, "Asked to ignore response\n");
 893                 /* not receiving this message is not an error, so decrement
 894                  * number of sent messages
 895                  */
 896                 reply->nb_sent--;
 897                 return 0;
 898         }
 899
 900         tmp = realloc(reply->msgs, sizeof(msg) * (reply->nb_received + 1));
 901         if (!tmp) {
 902                 RTE_LOG(ERR, EAL, "Fail to alloc reply for request %s:%s\n",
 903                         dst, req->name);
 904                 rte_errno = ENOMEM;
 905                 return -1;
 906         }
 907         memcpy(&tmp[reply->nb_received], &msg, sizeof(msg));
 908         reply->msgs = tmp;
 909         reply->nb_received++;
 910         return 0;
 911 }
 912
 913 int __rte_experimental
 914 rte_mp_request_sync(struct rte_mp_msg *req, struct rte_mp_reply *reply,
 915                 const struct timespec *ts)
 916 {
 917         int dir_fd, ret = 0;
 918         DIR *mp_dir;
 919         struct dirent *ent;
 920         struct timeval now;
 921         struct timespec end;
 922
 923         RTE_LOG(DEBUG, EAL, "request: %s\n", req->name);
 924
 925         reply->nb_sent = 0;
 926         reply->nb_received = 0;
 927         reply->msgs = NULL;
 928
 929         if (check_input(req) == false)
 930                 goto err;
 931
 932         if (internal_config.no_shconf) {
 933                 RTE_LOG(DEBUG, EAL, "No shared files mode enabled, IPC is disabled\n");
 934                 return 0;
 935         }
 936
 937         if (gettimeofday(&now, NULL) < 0) {
 938                 RTE_LOG(ERR, EAL, "Failed to get current time\n");
 939                 rte_errno = errno;
 940                 goto err;
 941         }
 942
 943         end.tv_nsec = (now.tv_usec * 1000 + ts->tv_nsec) % 1000000000;
 944         end.tv_sec = now.tv_sec + ts->tv_sec +
 945                         (now.tv_usec * 1000 + ts->tv_nsec) / 1000000000;
 946
 947         /* for secondary process, send request to the primary process only */
 948         if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
 949                 pthread_mutex_lock(&pending_requests.lock);
 950                 ret = mp_request_sync(eal_mp_socket_path(), req, reply, &end);
 951                 pthread_mutex_unlock(&pending_requests.lock);
 952                 if (ret)
 953                         goto err;
 954                 return ret;
 955         }
 956
 957         /* for primary process, broadcast request, and collect reply 1 by 1 */
 958         mp_dir = opendir(mp_dir_path);
 959         if (!mp_dir) {
 960                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n", mp_dir_path);
 961                 rte_errno = errno;
 962                 goto err;
 963         }
 964
 965         dir_fd = dirfd(mp_dir);
 966         /* lock the directory to prevent processes spinning up while we send */
 967         if (flock(dir_fd, LOCK_SH)) {
 968                 RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
 969                         mp_dir_path);
 970                 closedir(mp_dir);
 971                 rte_errno = errno;
 972                 goto err;
 973         }
 974
 975         pthread_mutex_lock(&pending_requests.lock);
 976         while ((ent = readdir(mp_dir))) {
 977                 char path[PATH_MAX];
 978
 979                 if (fnmatch(mp_filter, ent->d_name, 0) != 0)
 980                         continue;
 981
 982                 snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
 983                          ent->d_name);
 984
 985                 /* unlocks the mutex while waiting for response,
 986                  * locks on receive
 987                  */
 988                 if (mp_request_sync(path, req, reply, &end))
 989                         goto err;
 990         }
 991         pthread_mutex_unlock(&pending_requests.lock);
 992         /* unlock the directory */
 993         flock(dir_fd, LOCK_UN);
 994
 995         /* dir_fd automatically closed on closedir */
 996         closedir(mp_dir);
 997         return ret;
 998
 999 err:
1000         free(reply->msgs);
1001         reply->nb_received = 0;
1002         reply->msgs = NULL;
1003         return -1;
1004 }
1005
1006 int __rte_experimental
1007 rte_mp_request_async(struct rte_mp_msg *req, const struct timespec *ts,
1008                 rte_mp_async_reply_t clb)
1009 {
1010         struct rte_mp_msg *copy;
1011         struct pending_request *dummy;
1012         struct async_request_param *param;
1013         struct rte_mp_reply *reply;
1014         int dir_fd, ret = 0;
1015         DIR *mp_dir;
1016         struct dirent *ent;
1017         struct timeval now;
1018         struct timespec *end;
1019         bool dummy_used = false;
1020
1021         RTE_LOG(DEBUG, EAL, "request: %s\n", req->name);
1022
1023         if (check_input(req) == false)
1024                 return -1;
1025
1026         if (internal_config.no_shconf) {
1027                 RTE_LOG(DEBUG, EAL, "No shared files mode enabled, IPC is disabled\n");
1028                 return 0;
1029         }
1030
1031         if (gettimeofday(&now, NULL) < 0) {
1032                 RTE_LOG(ERR, EAL, "Faile to get current time\n");
1033                 rte_errno = errno;
1034                 return -1;
1035         }
1036         copy = calloc(1, sizeof(*copy));
1037         dummy = calloc(1, sizeof(*dummy));
1038         param = calloc(1, sizeof(*param));
1039         if (copy == NULL || dummy == NULL || param == NULL) {
1040                 RTE_LOG(ERR, EAL, "Failed to allocate memory for async reply\n");
1041                 rte_errno = ENOMEM;
1042                 goto fail;
1043         }
1044
1045         /* copy message */
1046         memcpy(copy, req, sizeof(*copy));
1047
1048         param->n_responses_processed = 0;
1049         param->clb = clb;
1050         end = &param->end;
1051         reply = &param->user_reply;
1052
1053         end->tv_nsec = (now.tv_usec * 1000 + ts->tv_nsec) % 1000000000;
1054         end->tv_sec = now.tv_sec + ts->tv_sec +
1055                         (now.tv_usec * 1000 + ts->tv_nsec) / 1000000000;
1056         reply->nb_sent = 0;
1057         reply->nb_received = 0;
1058         reply->msgs = NULL;
1059
1060         /* we have to lock the request queue here, as we will be adding a bunch
1061          * of requests to the queue at once, and some of the replies may arrive
1062          * before we add all of the requests to the queue.
1063          */
1064         pthread_mutex_lock(&pending_requests.lock);
1065
1066         /* we have to ensure that callback gets triggered even if we don't send
1067          * anything, therefore earlier we have allocated a dummy request. fill
1068          * it, and put it on the queue if we don't send any requests.
1069          */
1070         dummy->type = REQUEST_TYPE_ASYNC;
1071         dummy->request = copy;
1072         dummy->reply = NULL;
1073         dummy->async.param = param;
1074         dummy->reply_received = 1; /* short-circuit the timeout */
1075
1076         /* for secondary process, send request to the primary process only */
1077         if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
1078                 ret = mp_request_async(eal_mp_socket_path(), copy, param, ts);
1079
1080                 /* if we didn't send anything, put dummy request on the queue */
1081                 if (ret == 0 && reply->nb_sent == 0) {
1082                         TAILQ_INSERT_TAIL(&pending_requests.requests, dummy,
1083                                         next);
1084                         dummy_used = true;
1085                 }
1086
1087                 pthread_mutex_unlock(&pending_requests.lock);
1088
1089                 /* if we couldn't send anything, clean up */
1090                 if (ret != 0)
1091                         goto fail;
1092                 return 0;
1093         }
1094
1095         /* for primary process, broadcast request */
1096         mp_dir = opendir(mp_dir_path);
1097         if (!mp_dir) {
1098                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n", mp_dir_path);
1099                 rte_errno = errno;
1100                 goto unlock_fail;
1101         }
1102         dir_fd = dirfd(mp_dir);
1103
1104         /* lock the directory to prevent processes spinning up while we send */
1105         if (flock(dir_fd, LOCK_SH)) {
1106                 RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
1107                         mp_dir_path);
1108                 rte_errno = errno;
1109                 goto closedir_fail;
1110         }
1111
1112         while ((ent = readdir(mp_dir))) {
1113                 char path[PATH_MAX];
1114
1115                 if (fnmatch(mp_filter, ent->d_name, 0) != 0)
1116                         continue;
1117
1118                 snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
1119                          ent->d_name);
1120
1121                 if (mp_request_async(path, copy, param, ts))
1122                         ret = -1;
1123         }
1124         /* if we didn't send anything, put dummy request on the queue */
1125         if (ret == 0 && reply->nb_sent == 0) {
1126                 TAILQ_INSERT_HEAD(&pending_requests.requests, dummy, next);
1127                 dummy_used = true;
1128         }
1129
1130         /* finally, unlock the queue */
1131         pthread_mutex_unlock(&pending_requests.lock);
1132
1133         /* unlock the directory */
1134         flock(dir_fd, LOCK_UN);
1135
1136         /* dir_fd automatically closed on closedir */
1137         closedir(mp_dir);
1138
1139         /* if dummy was unused, free it */
1140         if (!dummy_used)
1141                 free(dummy);
1142
1143         return ret;
1144 closedir_fail:
1145         closedir(mp_dir);
1146 unlock_fail:
1147         pthread_mutex_unlock(&pending_requests.lock);
1148 fail:
1149         free(dummy);
1150         free(param);
1151         free(copy);
1152         return -1;
1153 }
1154
1155 int __rte_experimental
1156 rte_mp_reply(struct rte_mp_msg *msg, const char *peer)
1157 {
1158         RTE_LOG(DEBUG, EAL, "reply: %s\n", msg->name);
1159
1160         if (check_input(msg) == false)
1161                 return -1;
1162
1163         if (peer == NULL) {
1164                 RTE_LOG(ERR, EAL, "peer is not specified\n");
1165                 rte_errno = EINVAL;
1166                 return -1;
1167         }
1168
1169         if (internal_config.no_shconf) {
1170                 RTE_LOG(DEBUG, EAL, "No shared files mode enabled, IPC is disabled\n");
1171                 return 0;
1172         }
1173
1174         return mp_send(msg, peer, MP_REP);
1175 }