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
  41 struct action_entry {
  42         TAILQ_ENTRY(action_entry) next;
  43         char action_name[RTE_MP_MAX_NAME_LEN];
  44         rte_mp_t action;
  45 };
  46
  47 /** Double linked list of actions. */
  48 TAILQ_HEAD(action_entry_list, action_entry);
  49
  50 static struct action_entry_list action_entry_list =
  51         TAILQ_HEAD_INITIALIZER(action_entry_list);
  52
  53 enum mp_type {
  54         MP_MSG, /* Share message with peers, will not block */
  55         MP_REQ, /* Request for information, Will block for a reply */
  56         MP_REP, /* Response to previously-received request */
  57         MP_IGN, /* Response telling requester to ignore this response */
  58 };
  59
  60 struct mp_msg_internal {
  61         int type;
  62         struct rte_mp_msg msg;
  63 };
  64
  65 struct async_request_param {
  66         rte_mp_async_reply_t clb;
  67         struct rte_mp_reply user_reply;
  68         struct timespec end;
  69         int n_responses_processed;
  70 };
  71
  72 struct pending_request {
  73         TAILQ_ENTRY(pending_request) next;
  74         enum {
  75                 REQUEST_TYPE_SYNC,
  76                 REQUEST_TYPE_ASYNC
  77         } type;
  78         char dst[PATH_MAX];
  79         struct rte_mp_msg *request;
  80         struct rte_mp_msg *reply;
  81         int reply_received;
  82         RTE_STD_C11
  83         union {
  84                 struct {
  85                         struct async_request_param *param;
  86                 } async;
  87                 struct {
  88                         pthread_cond_t cond;
  89                 } sync;
  90         };
  91 };
  92
  93 TAILQ_HEAD(pending_request_list, pending_request);
  94
  95 static struct {
  96         struct pending_request_list requests;
  97         pthread_mutex_t lock;
  98 } pending_requests = {
  99         .requests = TAILQ_HEAD_INITIALIZER(pending_requests.requests),
 100         .lock = PTHREAD_MUTEX_INITIALIZER,
 101         /**< used in async requests only */
 102 };
 103
 104 /* forward declarations */
 105 static int
 106 mp_send(struct rte_mp_msg *msg, const char *peer, int type);
 107
 108 /* for use with alarm callback */
 109 static void
 110 async_reply_handle(void *arg);
 111
 112 /* for use with process_msg */
 113 static struct pending_request *
 114 async_reply_handle_thread_unsafe(void *arg);
 115
 116 static void
 117 trigger_async_action(struct pending_request *req);
 118
 119 static struct pending_request *
 120 find_pending_request(const char *dst, const char *act_name)
 121 {
 122         struct pending_request *r;
 123
 124         TAILQ_FOREACH(r, &pending_requests.requests, next) {
 125                 if (!strcmp(r->dst, dst) &&
 126                     !strcmp(r->request->name, act_name))
 127                         break;
 128         }
 129
 130         return r;
 131 }
 132
 133 static void
 134 create_socket_path(const char *name, char *buf, int len)
 135 {
 136         const char *prefix = eal_mp_socket_path();
 137
 138         if (strlen(name) > 0)
 139                 snprintf(buf, len, "%s_%s", prefix, name);
 140         else
 141                 strlcpy(buf, prefix, len);
 142 }
 143
 144 int
 145 rte_eal_primary_proc_alive(const char *config_file_path)
 146 {
 147         int config_fd;
 148
 149         if (config_file_path)
 150                 config_fd = open(config_file_path, O_RDONLY);
 151         else {
 152                 const char *path;
 153
 154                 path = eal_runtime_config_path();
 155                 config_fd = open(path, O_RDONLY);
 156         }
 157         if (config_fd < 0)
 158                 return 0;
 159
 160         int ret = lockf(config_fd, F_TEST, 0);
 161         close(config_fd);
 162
 163         return !!ret;
 164 }
 165
 166 static struct action_entry *
 167 find_action_entry_by_name(const char *name)
 168 {
 169         struct action_entry *entry;
 170
 171         TAILQ_FOREACH(entry, &action_entry_list, next) {
 172                 if (strncmp(entry->action_name, name, RTE_MP_MAX_NAME_LEN) == 0)
 173                         break;
 174         }
 175
 176         return entry;
 177 }
 178
 179 static int
 180 validate_action_name(const char *name)
 181 {
 182         if (name == NULL) {
 183                 RTE_LOG(ERR, EAL, "Action name cannot be NULL\n");
 184                 rte_errno = EINVAL;
 185                 return -1;
 186         }
 187         if (strnlen(name, RTE_MP_MAX_NAME_LEN) == 0) {
 188                 RTE_LOG(ERR, EAL, "Length of action name is zero\n");
 189                 rte_errno = EINVAL;
 190                 return -1;
 191         }
 192         if (strnlen(name, RTE_MP_MAX_NAME_LEN) == RTE_MP_MAX_NAME_LEN) {
 193                 rte_errno = E2BIG;
 194                 return -1;
 195         }
 196         return 0;
 197 }
 198
 199 int __rte_experimental
 200 rte_mp_action_register(const char *name, rte_mp_t action)
 201 {
 202         struct action_entry *entry;
 203
 204         if (validate_action_name(name))
 205                 return -1;
 206
 207         entry = malloc(sizeof(struct action_entry));
 208         if (entry == NULL) {
 209                 rte_errno = ENOMEM;
 210                 return -1;
 211         }
 212         strlcpy(entry->action_name, name, sizeof(entry->action_name));
 213         entry->action = action;
 214
 215         pthread_mutex_lock(&mp_mutex_action);
 216         if (find_action_entry_by_name(name) != NULL) {
 217                 pthread_mutex_unlock(&mp_mutex_action);
 218                 rte_errno = EEXIST;
 219                 free(entry);
 220                 return -1;
 221         }
 222         TAILQ_INSERT_TAIL(&action_entry_list, entry, next);
 223         pthread_mutex_unlock(&mp_mutex_action);
 224         return 0;
 225 }
 226
 227 void __rte_experimental
 228 rte_mp_action_unregister(const char *name)
 229 {
 230         struct action_entry *entry;
 231
 232         if (validate_action_name(name))
 233                 return;
 234
 235         pthread_mutex_lock(&mp_mutex_action);
 236         entry = find_action_entry_by_name(name);
 237         if (entry == NULL) {
 238                 pthread_mutex_unlock(&mp_mutex_action);
 239                 return;
 240         }
 241         TAILQ_REMOVE(&action_entry_list, entry, next);
 242         pthread_mutex_unlock(&mp_mutex_action);
 243         free(entry);
 244 }
 245
 246 static int
 247 read_msg(struct mp_msg_internal *m, struct sockaddr_un *s)
 248 {
 249         int msglen;
 250         struct iovec iov;
 251         struct msghdr msgh;
 252         char control[CMSG_SPACE(sizeof(m->msg.fds))];
 253         struct cmsghdr *cmsg;
 254         int buflen = sizeof(*m) - sizeof(m->msg.fds);
 255
 256         memset(&msgh, 0, sizeof(msgh));
 257         iov.iov_base = m;
 258         iov.iov_len  = buflen;
 259
 260         msgh.msg_name = s;
 261         msgh.msg_namelen = sizeof(*s);
 262         msgh.msg_iov = &iov;
 263         msgh.msg_iovlen = 1;
 264         msgh.msg_control = control;
 265         msgh.msg_controllen = sizeof(control);
 266
 267         msglen = recvmsg(mp_fd, &msgh, 0);
 268         if (msglen < 0) {
 269                 RTE_LOG(ERR, EAL, "recvmsg failed, %s\n", strerror(errno));
 270                 return -1;
 271         }
 272
 273         if (msglen != buflen || (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
 274                 RTE_LOG(ERR, EAL, "truncted msg\n");
 275                 return -1;
 276         }
 277
 278         /* read auxiliary FDs if any */
 279         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 280                 cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 281                 if ((cmsg->cmsg_level == SOL_SOCKET) &&
 282                         (cmsg->cmsg_type == SCM_RIGHTS)) {
 283                         memcpy(m->msg.fds, CMSG_DATA(cmsg), sizeof(m->msg.fds));
 284                         break;
 285                 }
 286         }
 287
 288         return 0;
 289 }
 290
 291 static void
 292 process_msg(struct mp_msg_internal *m, struct sockaddr_un *s)
 293 {
 294         struct pending_request *pending_req;
 295         struct action_entry *entry;
 296         struct rte_mp_msg *msg = &m->msg;
 297         rte_mp_t action = NULL;
 298
 299         RTE_LOG(DEBUG, EAL, "msg: %s\n", msg->name);
 300
 301         if (m->type == MP_REP || m->type == MP_IGN) {
 302                 struct pending_request *req = NULL;
 303
 304                 pthread_mutex_lock(&pending_requests.lock);
 305                 pending_req = find_pending_request(s->sun_path, msg->name);
 306                 if (pending_req) {
 307                         memcpy(pending_req->reply, msg, sizeof(*msg));
 308                         /* -1 indicates that we've been asked to ignore */
 309                         pending_req->reply_received =
 310                                 m->type == MP_REP ? 1 : -1;
 311
 312                         if (pending_req->type == REQUEST_TYPE_SYNC)
 313                                 pthread_cond_signal(&pending_req->sync.cond);
 314                         else if (pending_req->type == REQUEST_TYPE_ASYNC)
 315                                 req = async_reply_handle_thread_unsafe(
 316                                                 pending_req);
 317                 } else
 318                         RTE_LOG(ERR, EAL, "Drop mp reply: %s\n", msg->name);
 319                 pthread_mutex_unlock(&pending_requests.lock);
 320
 321                 if (req != NULL)
 322                         trigger_async_action(req);
 323                 return;
 324         }
 325
 326         pthread_mutex_lock(&mp_mutex_action);
 327         entry = find_action_entry_by_name(msg->name);
 328         if (entry != NULL)
 329                 action = entry->action;
 330         pthread_mutex_unlock(&mp_mutex_action);
 331
 332         if (!action) {
 333                 if (m->type == MP_REQ && !internal_config.init_complete) {
 334                         /* if this is a request, and init is not yet complete,
 335                          * and callback wasn't registered, we should tell the
 336                          * requester to ignore our existence because we're not
 337                          * yet ready to process this request.
 338                          */
 339                         struct rte_mp_msg dummy;
 340
 341                         memset(&dummy, 0, sizeof(dummy));
 342                         strlcpy(dummy.name, msg->name, sizeof(dummy.name));
 343                         mp_send(&dummy, s->sun_path, MP_IGN);
 344                 } else {
 345                         RTE_LOG(ERR, EAL, "Cannot find action: %s\n",
 346                                 msg->name);
 347                 }
 348         } else if (action(msg, s->sun_path) < 0) {
 349                 RTE_LOG(ERR, EAL, "Fail to handle message: %s\n", msg->name);
 350         }
 351 }
 352
 353 static void *
 354 mp_handle(void *arg __rte_unused)
 355 {
 356         struct mp_msg_internal msg;
 357         struct sockaddr_un sa;
 358
 359         while (1) {
 360                 if (read_msg(&msg, &sa) == 0)
 361                         process_msg(&msg, &sa);
 362         }
 363
 364         return NULL;
 365 }
 366
 367 static int
 368 timespec_cmp(const struct timespec *a, const struct timespec *b)
 369 {
 370         if (a->tv_sec < b->tv_sec)
 371                 return -1;
 372         if (a->tv_sec > b->tv_sec)
 373                 return 1;
 374         if (a->tv_nsec < b->tv_nsec)
 375                 return -1;
 376         if (a->tv_nsec > b->tv_nsec)
 377                 return 1;
 378         return 0;
 379 }
 380
 381 enum async_action {
 382         ACTION_FREE, /**< free the action entry, but don't trigger callback */
 383         ACTION_TRIGGER /**< trigger callback, then free action entry */
 384 };
 385
 386 static enum async_action
 387 process_async_request(struct pending_request *sr, const struct timespec *now)
 388 {
 389         struct async_request_param *param;
 390         struct rte_mp_reply *reply;
 391         bool timeout, last_msg;
 392
 393         param = sr->async.param;
 394         reply = &param->user_reply;
 395
 396         /* did we timeout? */
 397         timeout = timespec_cmp(&param->end, now) <= 0;
 398
 399         /* if we received a response, adjust relevant data and copy mesasge. */
 400         if (sr->reply_received == 1 && sr->reply) {
 401                 struct rte_mp_msg *msg, *user_msgs, *tmp;
 402
 403                 msg = sr->reply;
 404                 user_msgs = reply->msgs;
 405
 406                 tmp = realloc(user_msgs, sizeof(*msg) *
 407                                 (reply->nb_received + 1));
 408                 if (!tmp) {
 409                         RTE_LOG(ERR, EAL, "Fail to alloc reply for request %s:%s\n",
 410                                 sr->dst, sr->request->name);
 411                         /* this entry is going to be removed and its message
 412                          * dropped, but we don't want to leak memory, so
 413                          * continue.
 414                          */
 415                 } else {
 416                         user_msgs = tmp;
 417                         reply->msgs = user_msgs;
 418                         memcpy(&user_msgs[reply->nb_received],
 419                                         msg, sizeof(*msg));
 420                         reply->nb_received++;
 421                 }
 422
 423                 /* mark this request as processed */
 424                 param->n_responses_processed++;
 425         } else if (sr->reply_received == -1) {
 426                 /* we were asked to ignore this process */
 427                 reply->nb_sent--;
 428         } else if (timeout) {
 429                 /* count it as processed response, but don't increment
 430                  * nb_received.
 431                  */
 432                 param->n_responses_processed++;
 433         }
 434
 435         free(sr->reply);
 436
 437         last_msg = param->n_responses_processed == reply->nb_sent;
 438
 439         return last_msg ? ACTION_TRIGGER : ACTION_FREE;
 440 }
 441
 442 static void
 443 trigger_async_action(struct pending_request *sr)
 444 {
 445         struct async_request_param *param;
 446         struct rte_mp_reply *reply;
 447
 448         param = sr->async.param;
 449         reply = &param->user_reply;
 450
 451         param->clb(sr->request, reply);
 452
 453         /* clean up */
 454         free(sr->async.param->user_reply.msgs);
 455         free(sr->async.param);
 456         free(sr->request);
 457         free(sr);
 458 }
 459
 460 static struct pending_request *
 461 async_reply_handle_thread_unsafe(void *arg)
 462 {
 463         struct pending_request *req = (struct pending_request *)arg;
 464         enum async_action action;
 465         struct timespec ts_now;
 466         struct timeval now;
 467
 468         if (gettimeofday(&now, NULL) < 0) {
 469                 RTE_LOG(ERR, EAL, "Cannot get current time\n");
 470                 goto no_trigger;
 471         }
 472         ts_now.tv_nsec = now.tv_usec * 1000;
 473         ts_now.tv_sec = now.tv_sec;
 474
 475         action = process_async_request(req, &ts_now);
 476
 477         TAILQ_REMOVE(&pending_requests.requests, req, next);
 478
 479         if (rte_eal_alarm_cancel(async_reply_handle, req) < 0) {
 480                 /* if we failed to cancel the alarm because it's already in
 481                  * progress, don't proceed because otherwise we will end up
 482                  * handling the same message twice.
 483                  */
 484                 if (rte_errno == EINPROGRESS) {
 485                         RTE_LOG(DEBUG, EAL, "Request handling is already in progress\n");
 486                         goto no_trigger;
 487                 }
 488                 RTE_LOG(ERR, EAL, "Failed to cancel alarm\n");
 489         }
 490
 491         if (action == ACTION_TRIGGER)
 492                 return req;
 493 no_trigger:
 494         free(req);
 495         return NULL;
 496 }
 497
 498 static void
 499 async_reply_handle(void *arg)
 500 {
 501         struct pending_request *req;
 502
 503         pthread_mutex_lock(&pending_requests.lock);
 504         req = async_reply_handle_thread_unsafe(arg);
 505         pthread_mutex_unlock(&pending_requests.lock);
 506
 507         if (req != NULL)
 508                 trigger_async_action(req);
 509 }
 510
 511 static int
 512 open_socket_fd(void)
 513 {
 514         char peer_name[PATH_MAX] = {0};
 515         struct sockaddr_un un;
 516
 517         if (rte_eal_process_type() == RTE_PROC_SECONDARY)
 518                 snprintf(peer_name, sizeof(peer_name),
 519                                 "%d_%"PRIx64, getpid(), rte_rdtsc());
 520
 521         mp_fd = socket(AF_UNIX, SOCK_DGRAM, 0);
 522         if (mp_fd < 0) {
 523                 RTE_LOG(ERR, EAL, "failed to create unix socket\n");
 524                 return -1;
 525         }
 526
 527         memset(&un, 0, sizeof(un));
 528         un.sun_family = AF_UNIX;
 529
 530         create_socket_path(peer_name, un.sun_path, sizeof(un.sun_path));
 531
 532         unlink(un.sun_path); /* May still exist since last run */
 533
 534         if (bind(mp_fd, (struct sockaddr *)&un, sizeof(un)) < 0) {
 535                 RTE_LOG(ERR, EAL, "failed to bind %s: %s\n",
 536                         un.sun_path, strerror(errno));
 537                 close(mp_fd);
 538                 return -1;
 539         }
 540
 541         RTE_LOG(INFO, EAL, "Multi-process socket %s\n", un.sun_path);
 542         return mp_fd;
 543 }
 544
 545 int
 546 rte_mp_channel_init(void)
 547 {
 548         char path[PATH_MAX];
 549         int dir_fd;
 550         pthread_t mp_handle_tid;
 551
 552         /* in no shared files mode, we do not have secondary processes support,
 553          * so no need to initialize IPC.
 554          */
 555         if (internal_config.no_shconf) {
 556                 RTE_LOG(DEBUG, EAL, "No shared files mode enabled, IPC will be disabled\n");
 557                 return 0;
 558         }
 559
 560         /* create filter path */
 561         create_socket_path("*", path, sizeof(path));
 562         strlcpy(mp_filter, basename(path), sizeof(mp_filter));
 563
 564         /* path may have been modified, so recreate it */
 565         create_socket_path("*", path, sizeof(path));
 566         strlcpy(mp_dir_path, dirname(path), sizeof(mp_dir_path));
 567
 568         /* lock the directory */
 569         dir_fd = open(mp_dir_path, O_RDONLY);
 570         if (dir_fd < 0) {
 571                 RTE_LOG(ERR, EAL, "failed to open %s: %s\n",
 572                         mp_dir_path, strerror(errno));
 573                 return -1;
 574         }
 575
 576         if (flock(dir_fd, LOCK_EX)) {
 577                 RTE_LOG(ERR, EAL, "failed to lock %s: %s\n",
 578                         mp_dir_path, strerror(errno));
 579                 close(dir_fd);
 580                 return -1;
 581         }
 582
 583         if (open_socket_fd() < 0) {
 584                 close(dir_fd);
 585                 return -1;
 586         }
 587
 588         if (rte_ctrl_thread_create(&mp_handle_tid, "rte_mp_handle",
 589                         NULL, mp_handle, NULL) < 0) {
 590                 RTE_LOG(ERR, EAL, "failed to create mp thead: %s\n",
 591                         strerror(errno));
 592                 close(mp_fd);
 593                 close(dir_fd);
 594                 mp_fd = -1;
 595                 return -1;
 596         }
 597
 598         /* unlock the directory */
 599         flock(dir_fd, LOCK_UN);
 600         close(dir_fd);
 601
 602         return 0;
 603 }
 604
 605 /**
 606  * Return -1, as fail to send message and it's caused by the local side.
 607  * Return 0, as fail to send message and it's caused by the remote side.
 608  * Return 1, as succeed to send message.
 609  *
 610  */
 611 static int
 612 send_msg(const char *dst_path, struct rte_mp_msg *msg, int type)
 613 {
 614         int snd;
 615         struct iovec iov;
 616         struct msghdr msgh;
 617         struct cmsghdr *cmsg;
 618         struct sockaddr_un dst;
 619         struct mp_msg_internal m;
 620         int fd_size = msg->num_fds * sizeof(int);
 621         char control[CMSG_SPACE(fd_size)];
 622
 623         m.type = type;
 624         memcpy(&m.msg, msg, sizeof(*msg));
 625
 626         memset(&dst, 0, sizeof(dst));
 627         dst.sun_family = AF_UNIX;
 628         strlcpy(dst.sun_path, dst_path, sizeof(dst.sun_path));
 629
 630         memset(&msgh, 0, sizeof(msgh));
 631         memset(control, 0, sizeof(control));
 632
 633         iov.iov_base = &m;
 634         iov.iov_len = sizeof(m) - sizeof(msg->fds);
 635
 636         msgh.msg_name = &dst;
 637         msgh.msg_namelen = sizeof(dst);
 638         msgh.msg_iov = &iov;
 639         msgh.msg_iovlen = 1;
 640         msgh.msg_control = control;
 641         msgh.msg_controllen = sizeof(control);
 642
 643         cmsg = CMSG_FIRSTHDR(&msgh);
 644         cmsg->cmsg_len = CMSG_LEN(fd_size);
 645         cmsg->cmsg_level = SOL_SOCKET;
 646         cmsg->cmsg_type = SCM_RIGHTS;
 647         memcpy(CMSG_DATA(cmsg), msg->fds, fd_size);
 648
 649         do {
 650                 snd = sendmsg(mp_fd, &msgh, 0);
 651         } while (snd < 0 && errno == EINTR);
 652
 653         if (snd < 0) {
 654                 rte_errno = errno;
 655                 /* Check if it caused by peer process exits */
 656                 if (errno == ECONNREFUSED &&
 657                                 rte_eal_process_type() == RTE_PROC_PRIMARY) {
 658                         unlink(dst_path);
 659                         return 0;
 660                 }
 661                 if (errno == ENOBUFS) {
 662                         RTE_LOG(ERR, EAL, "Peer cannot receive message %s\n",
 663                                 dst_path);
 664                         return 0;
 665                 }
 666                 RTE_LOG(ERR, EAL, "failed to send to (%s) due to %s\n",
 667                         dst_path, strerror(errno));
 668                 return -1;
 669         }
 670
 671         return 1;
 672 }
 673
 674 static int
 675 mp_send(struct rte_mp_msg *msg, const char *peer, int type)
 676 {
 677         int dir_fd, ret = 0;
 678         DIR *mp_dir;
 679         struct dirent *ent;
 680
 681         if (!peer && (rte_eal_process_type() == RTE_PROC_SECONDARY))
 682                 peer = eal_mp_socket_path();
 683
 684         if (peer) {
 685                 if (send_msg(peer, msg, type) < 0)
 686                         return -1;
 687                 else
 688                         return 0;
 689         }
 690
 691         /* broadcast to all secondary processes */
 692         mp_dir = opendir(mp_dir_path);
 693         if (!mp_dir) {
 694                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n",
 695                                 mp_dir_path);
 696                 rte_errno = errno;
 697                 return -1;
 698         }
 699
 700         dir_fd = dirfd(mp_dir);
 701         /* lock the directory to prevent processes spinning up while we send */
 702         if (flock(dir_fd, LOCK_SH)) {
 703                 RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
 704                         mp_dir_path);
 705                 rte_errno = errno;
 706                 closedir(mp_dir);
 707                 return -1;
 708         }
 709
 710         while ((ent = readdir(mp_dir))) {
 711                 char path[PATH_MAX];
 712
 713                 if (fnmatch(mp_filter, ent->d_name, 0) != 0)
 714                         continue;
 715
 716                 snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
 717                          ent->d_name);
 718                 if (send_msg(path, msg, type) < 0)
 719                         ret = -1;
 720         }
 721         /* unlock the dir */
 722         flock(dir_fd, LOCK_UN);
 723
 724         /* dir_fd automatically closed on closedir */
 725         closedir(mp_dir);
 726         return ret;
 727 }
 728
 729 static bool
 730 check_input(const struct rte_mp_msg *msg)
 731 {
 732         if (msg == NULL) {
 733                 RTE_LOG(ERR, EAL, "Msg cannot be NULL\n");
 734                 rte_errno = EINVAL;
 735                 return false;
 736         }
 737
 738         if (validate_action_name(msg->name))
 739                 return false;
 740
 741         if (msg->len_param > RTE_MP_MAX_PARAM_LEN) {
 742                 RTE_LOG(ERR, EAL, "Message data is too long\n");
 743                 rte_errno = E2BIG;
 744                 return false;
 745         }
 746
 747         if (msg->num_fds > RTE_MP_MAX_FD_NUM) {
 748                 RTE_LOG(ERR, EAL, "Cannot send more than %d FDs\n",
 749                         RTE_MP_MAX_FD_NUM);
 750                 rte_errno = E2BIG;
 751                 return false;
 752         }
 753
 754         return true;
 755 }
 756
 757 int __rte_experimental
 758 rte_mp_sendmsg(struct rte_mp_msg *msg)
 759 {
 760         if (!check_input(msg))
 761                 return -1;
 762
 763         RTE_LOG(DEBUG, EAL, "sendmsg: %s\n", msg->name);
 764         return mp_send(msg, NULL, MP_MSG);
 765 }
 766
 767 static int
 768 mp_request_async(const char *dst, struct rte_mp_msg *req,
 769                 struct async_request_param *param, const struct timespec *ts)
 770 {
 771         struct rte_mp_msg *reply_msg;
 772         struct pending_request *pending_req, *exist;
 773         int ret = -1;
 774
 775         pending_req = calloc(1, sizeof(*pending_req));
 776         reply_msg = calloc(1, sizeof(*reply_msg));
 777         if (pending_req == NULL || reply_msg == NULL) {
 778                 RTE_LOG(ERR, EAL, "Could not allocate space for sync request\n");
 779                 rte_errno = ENOMEM;
 780                 ret = -1;
 781                 goto fail;
 782         }
 783
 784         pending_req->type = REQUEST_TYPE_ASYNC;
 785         strlcpy(pending_req->dst, dst, sizeof(pending_req->dst));
 786         pending_req->request = req;
 787         pending_req->reply = reply_msg;
 788         pending_req->async.param = param;
 789
 790         /* queue already locked by caller */
 791
 792         exist = find_pending_request(dst, req->name);
 793         if (exist) {
 794                 RTE_LOG(ERR, EAL, "A pending request %s:%s\n", dst, req->name);
 795                 rte_errno = EEXIST;
 796                 ret = -1;
 797                 goto fail;
 798         }
 799
 800         ret = send_msg(dst, req, MP_REQ);
 801         if (ret < 0) {
 802                 RTE_LOG(ERR, EAL, "Fail to send request %s:%s\n",
 803                         dst, req->name);
 804                 ret = -1;
 805                 goto fail;
 806         } else if (ret == 0) {
 807                 ret = 0;
 808                 goto fail;
 809         }
 810         param->user_reply.nb_sent++;
 811
 812         /* if alarm set fails, we simply ignore the reply */
 813         if (rte_eal_alarm_set(ts->tv_sec * 1000000 + ts->tv_nsec / 1000,
 814                               async_reply_handle, pending_req) < 0) {
 815                 RTE_LOG(ERR, EAL, "Fail to set alarm for request %s:%s\n",
 816                         dst, req->name);
 817                 ret = -1;
 818                 goto fail;
 819         }
 820         TAILQ_INSERT_TAIL(&pending_requests.requests, pending_req, next);
 821
 822         return 0;
 823 fail:
 824         free(pending_req);
 825         free(reply_msg);
 826         return ret;
 827 }
 828
 829 static int
 830 mp_request_sync(const char *dst, struct rte_mp_msg *req,
 831                struct rte_mp_reply *reply, const struct timespec *ts)
 832 {
 833         int ret;
 834         struct rte_mp_msg msg, *tmp;
 835         struct pending_request pending_req, *exist;
 836
 837         pending_req.type = REQUEST_TYPE_SYNC;
 838         pending_req.reply_received = 0;
 839         strlcpy(pending_req.dst, dst, sizeof(pending_req.dst));
 840         pending_req.request = req;
 841         pending_req.reply = &msg;
 842         pthread_cond_init(&pending_req.sync.cond, NULL);
 843
 844         exist = find_pending_request(dst, req->name);
 845         if (exist) {
 846                 RTE_LOG(ERR, EAL, "A pending request %s:%s\n", dst, req->name);
 847                 rte_errno = EEXIST;
 848                 return -1;
 849         }
 850
 851         ret = send_msg(dst, req, MP_REQ);
 852         if (ret < 0) {
 853                 RTE_LOG(ERR, EAL, "Fail to send request %s:%s\n",
 854                         dst, req->name);
 855                 return -1;
 856         } else if (ret == 0)
 857                 return 0;
 858
 859         TAILQ_INSERT_TAIL(&pending_requests.requests, &pending_req, next);
 860
 861         reply->nb_sent++;
 862
 863         do {
 864                 ret = pthread_cond_timedwait(&pending_req.sync.cond,
 865                                 &pending_requests.lock, ts);
 866         } while (ret != 0 && ret != ETIMEDOUT);
 867
 868         TAILQ_REMOVE(&pending_requests.requests, &pending_req, next);
 869
 870         if (pending_req.reply_received == 0) {
 871                 RTE_LOG(ERR, EAL, "Fail to recv reply for request %s:%s\n",
 872                         dst, req->name);
 873                 rte_errno = ETIMEDOUT;
 874                 return -1;
 875         }
 876         if (pending_req.reply_received == -1) {
 877                 RTE_LOG(DEBUG, EAL, "Asked to ignore response\n");
 878                 /* not receiving this message is not an error, so decrement
 879                  * number of sent messages
 880                  */
 881                 reply->nb_sent--;
 882                 return 0;
 883         }
 884
 885         tmp = realloc(reply->msgs, sizeof(msg) * (reply->nb_received + 1));
 886         if (!tmp) {
 887                 RTE_LOG(ERR, EAL, "Fail to alloc reply for request %s:%s\n",
 888                         dst, req->name);
 889                 rte_errno = ENOMEM;
 890                 return -1;
 891         }
 892         memcpy(&tmp[reply->nb_received], &msg, sizeof(msg));
 893         reply->msgs = tmp;
 894         reply->nb_received++;
 895         return 0;
 896 }
 897
 898 int __rte_experimental
 899 rte_mp_request_sync(struct rte_mp_msg *req, struct rte_mp_reply *reply,
 900                 const struct timespec *ts)
 901 {
 902         int dir_fd, ret = 0;
 903         DIR *mp_dir;
 904         struct dirent *ent;
 905         struct timeval now;
 906         struct timespec end;
 907
 908         RTE_LOG(DEBUG, EAL, "request: %s\n", req->name);
 909
 910         if (check_input(req) == false)
 911                 return -1;
 912
 913         reply->nb_sent = 0;
 914         reply->nb_received = 0;
 915         reply->msgs = NULL;
 916
 917         if (internal_config.no_shconf) {
 918                 RTE_LOG(DEBUG, EAL, "No shared files mode enabled, IPC is disabled\n");
 919                 return 0;
 920         }
 921
 922         if (gettimeofday(&now, NULL) < 0) {
 923                 RTE_LOG(ERR, EAL, "Failed to get current time\n");
 924                 rte_errno = errno;
 925                 return -1;
 926         }
 927
 928         end.tv_nsec = (now.tv_usec * 1000 + ts->tv_nsec) % 1000000000;
 929         end.tv_sec = now.tv_sec + ts->tv_sec +
 930                         (now.tv_usec * 1000 + ts->tv_nsec) / 1000000000;
 931
 932         /* for secondary process, send request to the primary process only */
 933         if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
 934                 pthread_mutex_lock(&pending_requests.lock);
 935                 ret = mp_request_sync(eal_mp_socket_path(), req, reply, &end);
 936                 pthread_mutex_unlock(&pending_requests.lock);
 937                 return ret;
 938         }
 939
 940         /* for primary process, broadcast request, and collect reply 1 by 1 */
 941         mp_dir = opendir(mp_dir_path);
 942         if (!mp_dir) {
 943                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n", mp_dir_path);
 944                 rte_errno = errno;
 945                 return -1;
 946         }
 947
 948         dir_fd = dirfd(mp_dir);
 949         /* lock the directory to prevent processes spinning up while we send */
 950         if (flock(dir_fd, LOCK_SH)) {
 951                 RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
 952                         mp_dir_path);
 953                 closedir(mp_dir);
 954                 rte_errno = errno;
 955                 return -1;
 956         }
 957
 958         pthread_mutex_lock(&pending_requests.lock);
 959         while ((ent = readdir(mp_dir))) {
 960                 char path[PATH_MAX];
 961
 962                 if (fnmatch(mp_filter, ent->d_name, 0) != 0)
 963                         continue;
 964
 965                 snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
 966                          ent->d_name);
 967
 968                 /* unlocks the mutex while waiting for response,
 969                  * locks on receive
 970                  */
 971                 if (mp_request_sync(path, req, reply, &end))
 972                         ret = -1;
 973         }
 974         pthread_mutex_unlock(&pending_requests.lock);
 975         /* unlock the directory */
 976         flock(dir_fd, LOCK_UN);
 977
 978         /* dir_fd automatically closed on closedir */
 979         closedir(mp_dir);
 980         return ret;
 981 }
 982
 983 int __rte_experimental
 984 rte_mp_request_async(struct rte_mp_msg *req, const struct timespec *ts,
 985                 rte_mp_async_reply_t clb)
 986 {
 987         struct rte_mp_msg *copy;
 988         struct pending_request *dummy;
 989         struct async_request_param *param;
 990         struct rte_mp_reply *reply;
 991         int dir_fd, ret = 0;
 992         DIR *mp_dir;
 993         struct dirent *ent;
 994         struct timeval now;
 995         struct timespec *end;
 996         bool dummy_used = false;
 997
 998         RTE_LOG(DEBUG, EAL, "request: %s\n", req->name);
 999
1000         if (check_input(req) == false)
1001                 return -1;
1002
1003         if (internal_config.no_shconf) {
1004                 RTE_LOG(DEBUG, EAL, "No shared files mode enabled, IPC is disabled\n");
1005                 return 0;
1006         }
1007
1008         if (gettimeofday(&now, NULL) < 0) {
1009                 RTE_LOG(ERR, EAL, "Faile to get current time\n");
1010                 rte_errno = errno;
1011                 return -1;
1012         }
1013         copy = calloc(1, sizeof(*copy));
1014         dummy = calloc(1, sizeof(*dummy));
1015         param = calloc(1, sizeof(*param));
1016         if (copy == NULL || dummy == NULL || param == NULL) {
1017                 RTE_LOG(ERR, EAL, "Failed to allocate memory for async reply\n");
1018                 rte_errno = ENOMEM;
1019                 goto fail;
1020         }
1021
1022         /* copy message */
1023         memcpy(copy, req, sizeof(*copy));
1024
1025         param->n_responses_processed = 0;
1026         param->clb = clb;
1027         end = &param->end;
1028         reply = &param->user_reply;
1029
1030         end->tv_nsec = (now.tv_usec * 1000 + ts->tv_nsec) % 1000000000;
1031         end->tv_sec = now.tv_sec + ts->tv_sec +
1032                         (now.tv_usec * 1000 + ts->tv_nsec) / 1000000000;
1033         reply->nb_sent = 0;
1034         reply->nb_received = 0;
1035         reply->msgs = NULL;
1036
1037         /* we have to lock the request queue here, as we will be adding a bunch
1038          * of requests to the queue at once, and some of the replies may arrive
1039          * before we add all of the requests to the queue.
1040          */
1041         pthread_mutex_lock(&pending_requests.lock);
1042
1043         /* we have to ensure that callback gets triggered even if we don't send
1044          * anything, therefore earlier we have allocated a dummy request. fill
1045          * it, and put it on the queue if we don't send any requests.
1046          */
1047         dummy->type = REQUEST_TYPE_ASYNC;
1048         dummy->request = copy;
1049         dummy->reply = NULL;
1050         dummy->async.param = param;
1051         dummy->reply_received = 1; /* short-circuit the timeout */
1052
1053         /* for secondary process, send request to the primary process only */
1054         if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
1055                 ret = mp_request_async(eal_mp_socket_path(), copy, param, ts);
1056
1057                 /* if we didn't send anything, put dummy request on the queue */
1058                 if (ret == 0 && reply->nb_sent == 0) {
1059                         TAILQ_INSERT_TAIL(&pending_requests.requests, dummy,
1060                                         next);
1061                         dummy_used = true;
1062                 }
1063
1064                 pthread_mutex_unlock(&pending_requests.lock);
1065
1066                 /* if we couldn't send anything, clean up */
1067                 if (ret != 0)
1068                         goto fail;
1069                 return 0;
1070         }
1071
1072         /* for primary process, broadcast request */
1073         mp_dir = opendir(mp_dir_path);
1074         if (!mp_dir) {
1075                 RTE_LOG(ERR, EAL, "Unable to open directory %s\n", mp_dir_path);
1076                 rte_errno = errno;
1077                 goto unlock_fail;
1078         }
1079         dir_fd = dirfd(mp_dir);
1080
1081         /* lock the directory to prevent processes spinning up while we send */
1082         if (flock(dir_fd, LOCK_SH)) {
1083                 RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
1084                         mp_dir_path);
1085                 rte_errno = errno;
1086                 goto closedir_fail;
1087         }
1088
1089         while ((ent = readdir(mp_dir))) {
1090                 char path[PATH_MAX];
1091
1092                 if (fnmatch(mp_filter, ent->d_name, 0) != 0)
1093                         continue;
1094
1095                 snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
1096                          ent->d_name);
1097
1098                 if (mp_request_async(path, copy, param, ts))
1099                         ret = -1;
1100         }
1101         /* if we didn't send anything, put dummy request on the queue */
1102         if (ret == 0 && reply->nb_sent == 0) {
1103                 TAILQ_INSERT_HEAD(&pending_requests.requests, dummy, next);
1104                 dummy_used = true;
1105         }
1106
1107         /* finally, unlock the queue */
1108         pthread_mutex_unlock(&pending_requests.lock);
1109
1110         /* unlock the directory */
1111         flock(dir_fd, LOCK_UN);
1112
1113         /* dir_fd automatically closed on closedir */
1114         closedir(mp_dir);
1115
1116         /* if dummy was unused, free it */
1117         if (!dummy_used)
1118                 free(dummy);
1119
1120         return ret;
1121 closedir_fail:
1122         closedir(mp_dir);
1123 unlock_fail:
1124         pthread_mutex_unlock(&pending_requests.lock);
1125 fail:
1126         free(dummy);
1127         free(param);
1128         free(copy);
1129         return -1;
1130 }
1131
1132 int __rte_experimental
1133 rte_mp_reply(struct rte_mp_msg *msg, const char *peer)
1134 {
1135         RTE_LOG(DEBUG, EAL, "reply: %s\n", msg->name);
1136
1137         if (check_input(msg) == false)
1138                 return -1;
1139
1140         if (peer == NULL) {
1141                 RTE_LOG(ERR, EAL, "peer is not specified\n");
1142                 rte_errno = EINVAL;
1143                 return -1;
1144         }
1145
1146         if (internal_config.no_shconf) {
1147                 RTE_LOG(DEBUG, EAL, "No shared files mode enabled, IPC is disabled\n");
1148                 return 0;
1149         }
1150
1151         return mp_send(msg, peer, MP_REP);
1152 }