contrib/rdmacm-mux/main.c

   1 /*
   2  * QEMU paravirtual RDMA - rdmacm-mux implementation
   3  *
   4  * Copyright (C) 2018 Oracle
   5  * Copyright (C) 2018 Red Hat Inc
   6  *
   7  * Authors:
   8  *     Yuval Shaia <yuval.shaia@oracle.com>
   9  *     Marcel Apfelbaum <marcel@redhat.com>
  10  *
  11  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  12  * See the COPYING file in the top-level directory.
  13  *
  14  */
  15
  16 #include "qemu/osdep.h"
  17 #include "sys/poll.h"
  18 #include "sys/ioctl.h"
  19 #include "pthread.h"
  20 #include "syslog.h"
  21
  22 #include "infiniband/verbs.h"
  23 #include "infiniband/umad.h"
  24 #include "infiniband/umad_types.h"
  25 #include "infiniband/umad_sa.h"
  26 #include "infiniband/umad_cm.h"
  27
  28 #include "rdmacm-mux.h"
  29
  30 #define SCALE_US 1000
  31 #define COMMID_TTL 2 /* How many SCALE_US a context of MAD session is saved */
  32 #define SLEEP_SECS 5 /* This is used both in poll() and thread */
  33 #define SERVER_LISTEN_BACKLOG 10
  34 #define MAX_CLIENTS 4096
  35 #define MAD_RMPP_VERSION 0
  36 #define MAD_METHOD_MASK0 0x8
  37
  38 #define IB_USER_MAD_LONGS_PER_METHOD_MASK (128 / (8 * sizeof(long)))
  39
  40 #define CM_REQ_DGID_POS      80
  41 #define CM_SIDR_REQ_DGID_POS 44
  42
  43 /* The below can be override by command line parameter */
  44 #define UNIX_SOCKET_PATH "/var/run/rdmacm-mux"
  45 /* Has format %s-%s-%d" <path>-<rdma-dev--name>-<port> */
  46 #define SOCKET_PATH_MAX (PATH_MAX - NAME_MAX - sizeof(int) - 2)
  47 #define RDMA_PORT_NUM 1
  48
  49 typedef struct RdmaCmServerArgs {
  50     char unix_socket_path[PATH_MAX];
  51     char rdma_dev_name[NAME_MAX];
  52     int rdma_port_num;
  53 } RdmaCMServerArgs;
  54
  55 typedef struct CommId2FdEntry {
  56     int fd;
  57     int ttl; /* Initialized to 2, decrement each timeout, entry delete when 0 */
  58     __be64 gid_ifid;
  59 } CommId2FdEntry;
  60
  61 typedef struct RdmaCmUMadAgent {
  62     int port_id;
  63     int agent_id;
  64     GHashTable *gid2fd; /* Used to find fd of a given gid */
  65     GHashTable *commid2fd; /* Used to find fd on of a given comm_id */
  66 } RdmaCmUMadAgent;
  67
  68 typedef struct RdmaCmServer {
  69     bool run;
  70     RdmaCMServerArgs args;
  71     struct pollfd fds[MAX_CLIENTS];
  72     int nfds;
  73     RdmaCmUMadAgent umad_agent;
  74     pthread_t umad_recv_thread;
  75     pthread_rwlock_t lock;
  76 } RdmaCMServer;
  77
  78 static RdmaCMServer server = {0};
  79
  80 static void usage(const char *progname)
  81 {
  82     printf("Usage: %s [OPTION]...\n"
  83            "Start a RDMA-CM multiplexer\n"
  84            "\n"
  85            "\t-h                    Show this help\n"
  86            "\t-d rdma-device-name   Name of RDMA device to register with\n"
  87            "\t-s unix-socket-path   Path to unix socket to listen on (default %s)\n"
  88            "\t-p rdma-device-port   Port number of RDMA device to register with (default %d)\n",
  89            progname, UNIX_SOCKET_PATH, RDMA_PORT_NUM);
  90 }
  91
  92 static void help(const char *progname)
  93 {
  94     fprintf(stderr, "Try '%s -h' for more information.\n", progname);
  95 }
  96
  97 static void parse_args(int argc, char *argv[])
  98 {
  99     int c;
 100     char unix_socket_path[SOCKET_PATH_MAX];
 101
 102     strcpy(server.args.rdma_dev_name, "");
 103     strcpy(unix_socket_path, UNIX_SOCKET_PATH);
 104     server.args.rdma_port_num = RDMA_PORT_NUM;
 105
 106     while ((c = getopt(argc, argv, "hs:d:p:")) != -1) {
 107         switch (c) {
 108         case 'h':
 109             usage(argv[0]);
 110             exit(0);
 111
 112         case 'd':
 113             strncpy(server.args.rdma_dev_name, optarg, NAME_MAX - 1);
 114             break;
 115
 116         case 's':
 117             /* This is temporary, final name will build below */
 118             strncpy(unix_socket_path, optarg, SOCKET_PATH_MAX);
 119             break;
 120
 121         case 'p':
 122             server.args.rdma_port_num = atoi(optarg);
 123             break;
 124
 125         default:
 126             help(argv[0]);
 127             exit(1);
 128         }
 129     }
 130
 131     if (!strcmp(server.args.rdma_dev_name, "")) {
 132         fprintf(stderr, "Missing RDMA device name\n");
 133         help(argv[0]);
 134         exit(1);
 135     }
 136
 137     /* Build unique unix-socket file name */
 138     snprintf(server.args.unix_socket_path, PATH_MAX, "%s-%s-%d",
 139              unix_socket_path, server.args.rdma_dev_name,
 140              server.args.rdma_port_num);
 141
 142     syslog(LOG_INFO, "unix_socket_path=%s", server.args.unix_socket_path);
 143     syslog(LOG_INFO, "rdma-device-name=%s", server.args.rdma_dev_name);
 144     syslog(LOG_INFO, "rdma-device-port=%d", server.args.rdma_port_num);
 145 }
 146
 147 static void hash_tbl_alloc(void)
 148 {
 149
 150     server.umad_agent.gid2fd = g_hash_table_new_full(g_int64_hash,
 151                                                      g_int64_equal,
 152                                                      g_free, g_free);
 153     server.umad_agent.commid2fd = g_hash_table_new_full(g_int_hash,
 154                                                         g_int_equal,
 155                                                         g_free, g_free);
 156 }
 157
 158 static void hash_tbl_free(void)
 159 {
 160     if (server.umad_agent.commid2fd) {
 161         g_hash_table_destroy(server.umad_agent.commid2fd);
 162     }
 163     if (server.umad_agent.gid2fd) {
 164         g_hash_table_destroy(server.umad_agent.gid2fd);
 165     }
 166 }
 167
 168
 169 static int _hash_tbl_search_fd_by_ifid(__be64 *gid_ifid)
 170 {
 171     int *fd;
 172
 173     fd = g_hash_table_lookup(server.umad_agent.gid2fd, gid_ifid);
 174     if (!fd) {
 175         /* Let's try IPv4 */
 176         *gid_ifid |= 0x00000000ffff0000;
 177         fd = g_hash_table_lookup(server.umad_agent.gid2fd, gid_ifid);
 178     }
 179
 180     return fd ? *fd : 0;
 181 }
 182
 183 static int hash_tbl_search_fd_by_ifid(int *fd, __be64 *gid_ifid)
 184 {
 185     pthread_rwlock_rdlock(&server.lock);
 186     *fd = _hash_tbl_search_fd_by_ifid(gid_ifid);
 187     pthread_rwlock_unlock(&server.lock);
 188
 189     if (!fd) {
 190         syslog(LOG_WARNING, "Can't find matching for ifid 0x%llx\n", *gid_ifid);
 191         return -ENOENT;
 192     }
 193
 194     return 0;
 195 }
 196
 197 static int hash_tbl_search_fd_by_comm_id(uint32_t comm_id, int *fd,
 198                                          __be64 *gid_idid)
 199 {
 200     CommId2FdEntry *fde;
 201
 202     pthread_rwlock_rdlock(&server.lock);
 203     fde = g_hash_table_lookup(server.umad_agent.commid2fd, &comm_id);
 204     pthread_rwlock_unlock(&server.lock);
 205
 206     if (!fde) {
 207         syslog(LOG_WARNING, "Can't find matching for comm_id 0x%x\n", comm_id);
 208         return -ENOENT;
 209     }
 210
 211     *fd = fde->fd;
 212     *gid_idid = fde->gid_ifid;
 213
 214     return 0;
 215 }
 216
 217 static RdmaCmMuxErrCode add_fd_ifid_pair(int fd, __be64 gid_ifid)
 218 {
 219     int fd1;
 220
 221     pthread_rwlock_wrlock(&server.lock);
 222
 223     fd1 = _hash_tbl_search_fd_by_ifid(&gid_ifid);
 224     if (fd1) { /* record already exist - an error */
 225         pthread_rwlock_unlock(&server.lock);
 226         return fd == fd1 ? RDMACM_MUX_ERR_CODE_EEXIST :
 227                            RDMACM_MUX_ERR_CODE_EACCES;
 228     }
 229
 230     g_hash_table_insert(server.umad_agent.gid2fd, g_memdup(&gid_ifid,
 231                         sizeof(gid_ifid)), g_memdup(&fd, sizeof(fd)));
 232
 233     pthread_rwlock_unlock(&server.lock);
 234
 235     syslog(LOG_INFO, "0x%lx registered on socket %d",
 236            be64toh((uint64_t)gid_ifid), fd);
 237
 238     return RDMACM_MUX_ERR_CODE_OK;
 239 }
 240
 241 static RdmaCmMuxErrCode delete_fd_ifid_pair(int fd, __be64 gid_ifid)
 242 {
 243     int fd1;
 244
 245     pthread_rwlock_wrlock(&server.lock);
 246
 247     fd1 = _hash_tbl_search_fd_by_ifid(&gid_ifid);
 248     if (!fd1) { /* record not exist - an error */
 249         pthread_rwlock_unlock(&server.lock);
 250         return RDMACM_MUX_ERR_CODE_ENOTFOUND;
 251     }
 252
 253     g_hash_table_remove(server.umad_agent.gid2fd, g_memdup(&gid_ifid,
 254                         sizeof(gid_ifid)));
 255     pthread_rwlock_unlock(&server.lock);
 256
 257     syslog(LOG_INFO, "0x%lx unregistered on socket %d",
 258            be64toh((uint64_t)gid_ifid), fd);
 259
 260     return RDMACM_MUX_ERR_CODE_OK;
 261 }
 262
 263 static void hash_tbl_save_fd_comm_id_pair(int fd, uint32_t comm_id,
 264                                           uint64_t gid_ifid)
 265 {
 266     CommId2FdEntry fde = {fd, COMMID_TTL, gid_ifid};
 267
 268     pthread_rwlock_wrlock(&server.lock);
 269     g_hash_table_insert(server.umad_agent.commid2fd,
 270                         g_memdup(&comm_id, sizeof(comm_id)),
 271                         g_memdup(&fde, sizeof(fde)));
 272     pthread_rwlock_unlock(&server.lock);
 273 }
 274
 275 static gboolean remove_old_comm_ids(gpointer key, gpointer value,
 276                                     gpointer user_data)
 277 {
 278     CommId2FdEntry *fde = (CommId2FdEntry *)value;
 279
 280     return !fde->ttl--;
 281 }
 282
 283 static gboolean remove_entry_from_gid2fd(gpointer key, gpointer value,
 284                                          gpointer user_data)
 285 {
 286     if (*(int *)value == *(int *)user_data) {
 287         syslog(LOG_INFO, "0x%lx unregistered on socket %d",
 288                be64toh(*(uint64_t *)key), *(int *)value);
 289         return true;
 290     }
 291
 292     return false;
 293 }
 294
 295 static void hash_tbl_remove_fd_ifid_pair(int fd)
 296 {
 297     pthread_rwlock_wrlock(&server.lock);
 298     g_hash_table_foreach_remove(server.umad_agent.gid2fd,
 299                                 remove_entry_from_gid2fd, (gpointer)&fd);
 300     pthread_rwlock_unlock(&server.lock);
 301 }
 302
 303 static int get_fd(const char *mad, int *fd, __be64 *gid_ifid)
 304 {
 305     struct umad_hdr *hdr = (struct umad_hdr *)mad;
 306     char *data = (char *)hdr + sizeof(*hdr);
 307     int32_t comm_id = 0;
 308     uint16_t attr_id = be16toh(hdr->attr_id);
 309     int rc = 0;
 310
 311     switch (attr_id) {
 312     case UMAD_CM_ATTR_REQ:
 313         memcpy(gid_ifid, data + CM_REQ_DGID_POS, sizeof(*gid_ifid));
 314         rc = hash_tbl_search_fd_by_ifid(fd, gid_ifid);
 315         break;
 316
 317     case UMAD_CM_ATTR_SIDR_REQ:
 318         memcpy(gid_ifid, data + CM_SIDR_REQ_DGID_POS, sizeof(*gid_ifid));
 319         rc = hash_tbl_search_fd_by_ifid(fd, gid_ifid);
 320         break;
 321
 322     case UMAD_CM_ATTR_REP:
 323         /* Fall through */
 324     case UMAD_CM_ATTR_REJ:
 325         /* Fall through */
 326     case UMAD_CM_ATTR_DREQ:
 327         /* Fall through */
 328     case UMAD_CM_ATTR_DREP:
 329         /* Fall through */
 330     case UMAD_CM_ATTR_RTU:
 331         data += sizeof(comm_id);
 332         /* Fall through */
 333     case UMAD_CM_ATTR_SIDR_REP:
 334         memcpy(&comm_id, data, sizeof(comm_id));
 335         if (comm_id) {
 336             rc = hash_tbl_search_fd_by_comm_id(comm_id, fd, gid_ifid);
 337         }
 338         break;
 339
 340     default:
 341         rc = -EINVAL;
 342         syslog(LOG_WARNING, "Unsupported attr_id 0x%x\n", attr_id);
 343     }
 344
 345     syslog(LOG_DEBUG, "mad_to_vm: %d 0x%x 0x%x\n", *fd, attr_id, comm_id);
 346
 347     return rc;
 348 }
 349
 350 static void *umad_recv_thread_func(void *args)
 351 {
 352     int rc;
 353     RdmaCmMuxMsg msg = {};
 354     int fd = -2;
 355
 356     msg.hdr.msg_type = RDMACM_MUX_MSG_TYPE_REQ;
 357     msg.hdr.op_code = RDMACM_MUX_OP_CODE_MAD;
 358
 359     while (server.run) {
 360         do {
 361             msg.umad_len = sizeof(msg.umad.mad);
 362             rc = umad_recv(server.umad_agent.port_id, &msg.umad, &msg.umad_len,
 363                            SLEEP_SECS * SCALE_US);
 364             if ((rc == -EIO) || (rc == -EINVAL)) {
 365                 syslog(LOG_CRIT, "Fatal error while trying to read MAD");
 366             }
 367
 368             if (rc == -ETIMEDOUT) {
 369                 g_hash_table_foreach_remove(server.umad_agent.commid2fd,
 370                                             remove_old_comm_ids, NULL);
 371             }
 372         } while (rc && server.run);
 373
 374         if (server.run) {
 375             rc = get_fd(msg.umad.mad, &fd, &msg.hdr.sgid.global.interface_id);
 376             if (rc) {
 377                 continue;
 378             }
 379
 380             send(fd, &msg, sizeof(msg), 0);
 381         }
 382     }
 383
 384     return NULL;
 385 }
 386
 387 static int read_and_process(int fd)
 388 {
 389     int rc;
 390     RdmaCmMuxMsg msg = {};
 391     struct umad_hdr *hdr;
 392     uint32_t *comm_id = 0;
 393     uint16_t attr_id;
 394
 395     rc = recv(fd, &msg, sizeof(msg), 0);
 396     syslog(LOG_DEBUG, "Socket %d, recv %d\n", fd, rc);
 397
 398     if (rc < 0 && errno != EWOULDBLOCK) {
 399         syslog(LOG_ERR, "Fail to read from socket %d\n", fd);
 400         return -EIO;
 401     }
 402
 403     if (!rc) {
 404         syslog(LOG_ERR, "Fail to read from socket %d\n", fd);
 405         return -EPIPE;
 406     }
 407
 408     if (msg.hdr.msg_type != RDMACM_MUX_MSG_TYPE_REQ) {
 409         syslog(LOG_WARNING, "Got non-request message (%d) from socket %d\n",
 410                msg.hdr.msg_type, fd);
 411         return -EPERM;
 412     }
 413
 414     switch (msg.hdr.op_code) {
 415     case RDMACM_MUX_OP_CODE_REG:
 416         rc = add_fd_ifid_pair(fd, msg.hdr.sgid.global.interface_id);
 417         break;
 418
 419     case RDMACM_MUX_OP_CODE_UNREG:
 420         rc = delete_fd_ifid_pair(fd, msg.hdr.sgid.global.interface_id);
 421         break;
 422
 423     case RDMACM_MUX_OP_CODE_MAD:
 424         /* If this is REQ or REP then store the pair comm_id,fd to be later
 425          * used for other messages where gid is unknown */
 426         hdr = (struct umad_hdr *)msg.umad.mad;
 427         attr_id = be16toh(hdr->attr_id);
 428         if ((attr_id == UMAD_CM_ATTR_REQ) || (attr_id == UMAD_CM_ATTR_DREQ) ||
 429             (attr_id == UMAD_CM_ATTR_SIDR_REQ) ||
 430             (attr_id == UMAD_CM_ATTR_REP) || (attr_id == UMAD_CM_ATTR_DREP)) {
 431             comm_id = (uint32_t *)(msg.umad.mad + sizeof(*hdr));
 432             hash_tbl_save_fd_comm_id_pair(fd, *comm_id,
 433                                           msg.hdr.sgid.global.interface_id);
 434         }
 435
 436         syslog(LOG_DEBUG, "vm_to_mad: %d 0x%x 0x%x\n", fd, attr_id,
 437                comm_id ? *comm_id : 0);
 438         rc = umad_send(server.umad_agent.port_id, server.umad_agent.agent_id,
 439                        &msg.umad, msg.umad_len, 1, 0);
 440         if (rc) {
 441             syslog(LOG_ERR,
 442                   "Fail to send MAD message (0x%x) from socket %d, err=%d",
 443                   attr_id, fd, rc);
 444         }
 445         break;
 446
 447     default:
 448         syslog(LOG_ERR, "Got invalid op_code (%d) from socket %d",
 449                msg.hdr.msg_type, fd);
 450         rc = RDMACM_MUX_ERR_CODE_EINVAL;
 451     }
 452
 453     msg.hdr.msg_type = RDMACM_MUX_MSG_TYPE_RESP;
 454     msg.hdr.err_code = rc;
 455     rc = send(fd, &msg, sizeof(msg), 0);
 456
 457     return rc == sizeof(msg) ? 0 : -EPIPE;
 458 }
 459
 460 static int accept_all(void)
 461 {
 462     int fd, rc = 0;;
 463
 464     pthread_rwlock_wrlock(&server.lock);
 465
 466     do {
 467         if ((server.nfds + 1) > MAX_CLIENTS) {
 468             syslog(LOG_WARNING, "Too many clients (%d)", server.nfds);
 469             rc = -EIO;
 470             goto out;
 471         }
 472
 473         fd = accept(server.fds[0].fd, NULL, NULL);
 474         if (fd < 0) {
 475             if (errno != EWOULDBLOCK) {
 476                 syslog(LOG_WARNING, "accept() failed");
 477                 rc = -EIO;
 478                 goto out;
 479             }
 480             break;
 481         }
 482
 483         syslog(LOG_INFO, "Client connected on socket %d\n", fd);
 484         server.fds[server.nfds].fd = fd;
 485         server.fds[server.nfds].events = POLLIN;
 486         server.nfds++;
 487     } while (fd != -1);
 488
 489 out:
 490     pthread_rwlock_unlock(&server.lock);
 491     return rc;
 492 }
 493
 494 static void compress_fds(void)
 495 {
 496     int i, j;
 497     int closed = 0;
 498
 499     pthread_rwlock_wrlock(&server.lock);
 500
 501     for (i = 1; i < server.nfds; i++) {
 502         if (!server.fds[i].fd) {
 503             closed++;
 504             for (j = i; j < server.nfds - 1; j++) {
 505                 server.fds[j] = server.fds[j + 1];
 506             }
 507         }
 508     }
 509
 510     server.nfds -= closed;
 511
 512     pthread_rwlock_unlock(&server.lock);
 513 }
 514
 515 static void close_fd(int idx)
 516 {
 517     close(server.fds[idx].fd);
 518     syslog(LOG_INFO, "Socket %d closed\n", server.fds[idx].fd);
 519     hash_tbl_remove_fd_ifid_pair(server.fds[idx].fd);
 520     server.fds[idx].fd = 0;
 521 }
 522
 523 static void run(void)
 524 {
 525     int rc, nfds, i;
 526     bool compress = false;
 527
 528     syslog(LOG_INFO, "Service started");
 529
 530     while (server.run) {
 531         rc = poll(server.fds, server.nfds, SLEEP_SECS * SCALE_US);
 532         if (rc < 0) {
 533             if (errno != EINTR) {
 534                 syslog(LOG_WARNING, "poll() failed");
 535             }
 536             continue;
 537         }
 538
 539         if (rc == 0) {
 540             continue;
 541         }
 542
 543         nfds = server.nfds;
 544         for (i = 0; i < nfds; i++) {
 545             syslog(LOG_DEBUG, "pollfd[%d]: revents 0x%x, events 0x%x\n", i,
 546                    server.fds[i].revents, server.fds[i].events);
 547             if (server.fds[i].revents == 0) {
 548                 continue;
 549             }
 550
 551             if (server.fds[i].revents != POLLIN) {
 552                 if (i == 0) {
 553                     syslog(LOG_NOTICE, "Unexpected poll() event (0x%x)\n",
 554                            server.fds[i].revents);
 555                 } else {
 556                     close_fd(i);
 557                     compress = true;
 558                 }
 559                 continue;
 560             }
 561
 562             if (i == 0) {
 563                 rc = accept_all();
 564                 if (rc) {
 565                     continue;
 566                 }
 567             } else {
 568                 rc = read_and_process(server.fds[i].fd);
 569                 if (rc) {
 570                     close_fd(i);
 571                     compress = true;
 572                 }
 573             }
 574         }
 575
 576         if (compress) {
 577             compress = false;
 578             compress_fds();
 579         }
 580     }
 581 }
 582
 583 static void fini_listener(void)
 584 {
 585     int i;
 586
 587     if (server.fds[0].fd <= 0) {
 588         return;
 589     }
 590
 591     for (i = server.nfds - 1; i >= 0; i--) {
 592         if (server.fds[i].fd) {
 593             close(server.fds[i].fd);
 594         }
 595     }
 596
 597     unlink(server.args.unix_socket_path);
 598 }
 599
 600 static void fini_umad(void)
 601 {
 602     if (server.umad_agent.agent_id) {
 603         umad_unregister(server.umad_agent.port_id, server.umad_agent.agent_id);
 604     }
 605
 606     if (server.umad_agent.port_id) {
 607         umad_close_port(server.umad_agent.port_id);
 608     }
 609
 610     hash_tbl_free();
 611 }
 612
 613 static void fini(void)
 614 {
 615     if (server.umad_recv_thread) {
 616         pthread_join(server.umad_recv_thread, NULL);
 617         server.umad_recv_thread = 0;
 618     }
 619     fini_umad();
 620     fini_listener();
 621     pthread_rwlock_destroy(&server.lock);
 622
 623     syslog(LOG_INFO, "Service going down");
 624 }
 625
 626 static int init_listener(void)
 627 {
 628     struct sockaddr_un sun;
 629     int rc, on = 1;
 630
 631     server.fds[0].fd = socket(AF_UNIX, SOCK_STREAM, 0);
 632     if (server.fds[0].fd < 0) {
 633         syslog(LOG_ALERT, "socket() failed");
 634         return -EIO;
 635     }
 636
 637     rc = setsockopt(server.fds[0].fd, SOL_SOCKET, SO_REUSEADDR, (char *)&on,
 638                     sizeof(on));
 639     if (rc < 0) {
 640         syslog(LOG_ALERT, "setsockopt() failed");
 641         rc = -EIO;
 642         goto err;
 643     }
 644
 645     rc = ioctl(server.fds[0].fd, FIONBIO, (char *)&on);
 646     if (rc < 0) {
 647         syslog(LOG_ALERT, "ioctl() failed");
 648         rc = -EIO;
 649         goto err;
 650     }
 651
 652     if (strlen(server.args.unix_socket_path) >= sizeof(sun.sun_path)) {
 653         syslog(LOG_ALERT,
 654                "Invalid unix_socket_path, size must be less than %ld\n",
 655                sizeof(sun.sun_path));
 656         rc = -EINVAL;
 657         goto err;
 658     }
 659
 660     sun.sun_family = AF_UNIX;
 661     rc = snprintf(sun.sun_path, sizeof(sun.sun_path), "%s",
 662                   server.args.unix_socket_path);
 663     if (rc < 0 || rc >= sizeof(sun.sun_path)) {
 664         syslog(LOG_ALERT, "Could not copy unix socket path\n");
 665         rc = -EINVAL;
 666         goto err;
 667     }
 668
 669     rc = bind(server.fds[0].fd, (struct sockaddr *)&sun, sizeof(sun));
 670     if (rc < 0) {
 671         syslog(LOG_ALERT, "bind() failed");
 672         rc = -EIO;
 673         goto err;
 674     }
 675
 676     rc = listen(server.fds[0].fd, SERVER_LISTEN_BACKLOG);
 677     if (rc < 0) {
 678         syslog(LOG_ALERT, "listen() failed");
 679         rc = -EIO;
 680         goto err;
 681     }
 682
 683     server.fds[0].events = POLLIN;
 684     server.nfds = 1;
 685     server.run = true;
 686
 687     return 0;
 688
 689 err:
 690     close(server.fds[0].fd);
 691     return rc;
 692 }
 693
 694 static int init_umad(void)
 695 {
 696     long method_mask[IB_USER_MAD_LONGS_PER_METHOD_MASK];
 697
 698     server.umad_agent.port_id = umad_open_port(server.args.rdma_dev_name,
 699                                                server.args.rdma_port_num);
 700
 701     if (server.umad_agent.port_id < 0) {
 702         syslog(LOG_WARNING, "umad_open_port() failed");
 703         return -EIO;
 704     }
 705
 706     memset(&method_mask, 0, sizeof(method_mask));
 707     method_mask[0] = MAD_METHOD_MASK0;
 708     server.umad_agent.agent_id = umad_register(server.umad_agent.port_id,
 709                                                UMAD_CLASS_CM,
 710                                                UMAD_SA_CLASS_VERSION,
 711                                                MAD_RMPP_VERSION, method_mask);
 712     if (server.umad_agent.agent_id < 0) {
 713         syslog(LOG_WARNING, "umad_register() failed");
 714         return -EIO;
 715     }
 716
 717     hash_tbl_alloc();
 718
 719     return 0;
 720 }
 721
 722 static void signal_handler(int sig, siginfo_t *siginfo, void *context)
 723 {
 724     static bool warned;
 725
 726     /* Prevent stop if clients are connected */
 727     if (server.nfds != 1) {
 728         if (!warned) {
 729             syslog(LOG_WARNING,
 730                    "Can't stop while active client exist, resend SIGINT to overid");
 731             warned = true;
 732             return;
 733         }
 734     }
 735
 736     if (sig == SIGINT) {
 737         server.run = false;
 738         fini();
 739     }
 740
 741     exit(0);
 742 }
 743
 744 static int init(void)
 745 {
 746     int rc;
 747     struct sigaction sig = {};
 748
 749     rc = init_listener();
 750     if (rc) {
 751         return rc;
 752     }
 753
 754     rc = init_umad();
 755     if (rc) {
 756         return rc;
 757     }
 758
 759     pthread_rwlock_init(&server.lock, 0);
 760
 761     rc = pthread_create(&server.umad_recv_thread, NULL, umad_recv_thread_func,
 762                         NULL);
 763     if (rc) {
 764         syslog(LOG_ERR, "Fail to create UMAD receiver thread (%d)\n", rc);
 765         return rc;
 766     }
 767
 768     sig.sa_sigaction = &signal_handler;
 769     sig.sa_flags = SA_SIGINFO;
 770     rc = sigaction(SIGINT, &sig, NULL);
 771     if (rc < 0) {
 772         syslog(LOG_ERR, "Fail to install SIGINT handler (%d)\n", errno);
 773         return rc;
 774     }
 775
 776     return 0;
 777 }
 778
 779 int main(int argc, char *argv[])
 780 {
 781     int rc;
 782
 783     memset(&server, 0, sizeof(server));
 784
 785     parse_args(argc, argv);
 786
 787     rc = init();
 788     if (rc) {
 789         syslog(LOG_ERR, "Fail to initialize server (%d)\n", rc);
 790         rc = -EAGAIN;
 791         goto out;
 792     }
 793
 794     run();
 795
 796 out:
 797     fini();
 798
 799     return rc;
 800 }