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 - 1);
 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 umad_len, 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     if (umad_len <= sizeof(*hdr)) {
 312         rc = -EINVAL;
 313         syslog(LOG_DEBUG, "Ignoring MAD packets with header only\n");
 314         goto out;
 315     }
 316
 317     switch (attr_id) {
 318     case UMAD_CM_ATTR_REQ:
 319         if (unlikely(umad_len < sizeof(*hdr) + CM_REQ_DGID_POS +
 320             sizeof(*gid_ifid))) {
 321             rc = -EINVAL;
 322             syslog(LOG_WARNING,
 323                    "Invalid MAD packet size (%d) for attr_id 0x%x\n", umad_len,
 324                     attr_id);
 325             goto out;
 326         }
 327         memcpy(gid_ifid, data + CM_REQ_DGID_POS, sizeof(*gid_ifid));
 328         rc = hash_tbl_search_fd_by_ifid(fd, gid_ifid);
 329         break;
 330
 331     case UMAD_CM_ATTR_SIDR_REQ:
 332         if (unlikely(umad_len < sizeof(*hdr) + CM_SIDR_REQ_DGID_POS +
 333             sizeof(*gid_ifid))) {
 334             rc = -EINVAL;
 335             syslog(LOG_WARNING,
 336                    "Invalid MAD packet size (%d) for attr_id 0x%x\n", umad_len,
 337                     attr_id);
 338             goto out;
 339         }
 340         memcpy(gid_ifid, data + CM_SIDR_REQ_DGID_POS, sizeof(*gid_ifid));
 341         rc = hash_tbl_search_fd_by_ifid(fd, gid_ifid);
 342         break;
 343
 344     case UMAD_CM_ATTR_REP:
 345         /* Fall through */
 346     case UMAD_CM_ATTR_REJ:
 347         /* Fall through */
 348     case UMAD_CM_ATTR_DREQ:
 349         /* Fall through */
 350     case UMAD_CM_ATTR_DREP:
 351         /* Fall through */
 352     case UMAD_CM_ATTR_RTU:
 353         data += sizeof(comm_id);
 354         /* Fall through */
 355     case UMAD_CM_ATTR_SIDR_REP:
 356         if (unlikely(umad_len < sizeof(*hdr) + sizeof(comm_id))) {
 357             rc = -EINVAL;
 358             syslog(LOG_WARNING,
 359                    "Invalid MAD packet size (%d) for attr_id 0x%x\n", umad_len,
 360                    attr_id);
 361             goto out;
 362         }
 363         memcpy(&comm_id, data, sizeof(comm_id));
 364         if (comm_id) {
 365             rc = hash_tbl_search_fd_by_comm_id(comm_id, fd, gid_ifid);
 366         }
 367         break;
 368
 369     default:
 370         rc = -EINVAL;
 371         syslog(LOG_WARNING, "Unsupported attr_id 0x%x\n", attr_id);
 372     }
 373
 374     syslog(LOG_DEBUG, "mad_to_vm: %d 0x%x 0x%x\n", *fd, attr_id, comm_id);
 375
 376 out:
 377     return rc;
 378 }
 379
 380 static void *umad_recv_thread_func(void *args)
 381 {
 382     int rc;
 383     RdmaCmMuxMsg msg = {};
 384     int fd = -2;
 385
 386     msg.hdr.msg_type = RDMACM_MUX_MSG_TYPE_REQ;
 387     msg.hdr.op_code = RDMACM_MUX_OP_CODE_MAD;
 388
 389     while (server.run) {
 390         do {
 391             msg.umad_len = sizeof(msg.umad.mad);
 392             rc = umad_recv(server.umad_agent.port_id, &msg.umad, &msg.umad_len,
 393                            SLEEP_SECS * SCALE_US);
 394             if ((rc == -EIO) || (rc == -EINVAL)) {
 395                 syslog(LOG_CRIT, "Fatal error while trying to read MAD");
 396             }
 397
 398             if (rc == -ETIMEDOUT) {
 399                 g_hash_table_foreach_remove(server.umad_agent.commid2fd,
 400                                             remove_old_comm_ids, NULL);
 401             }
 402         } while (rc && server.run);
 403
 404         if (server.run) {
 405             rc = get_fd(msg.umad.mad, msg.umad_len, &fd,
 406                         &msg.hdr.sgid.global.interface_id);
 407             if (rc) {
 408                 continue;
 409             }
 410
 411             send(fd, &msg, sizeof(msg), 0);
 412         }
 413     }
 414
 415     return NULL;
 416 }
 417
 418 static int read_and_process(int fd)
 419 {
 420     int rc;
 421     RdmaCmMuxMsg msg = {};
 422     struct umad_hdr *hdr;
 423     uint32_t *comm_id = 0;
 424     uint16_t attr_id;
 425
 426     rc = recv(fd, &msg, sizeof(msg), 0);
 427     syslog(LOG_DEBUG, "Socket %d, recv %d\n", fd, rc);
 428
 429     if (rc < 0 && errno != EWOULDBLOCK) {
 430         syslog(LOG_ERR, "Fail to read from socket %d\n", fd);
 431         return -EIO;
 432     }
 433
 434     if (!rc) {
 435         syslog(LOG_ERR, "Fail to read from socket %d\n", fd);
 436         return -EPIPE;
 437     }
 438
 439     if (msg.hdr.msg_type != RDMACM_MUX_MSG_TYPE_REQ) {
 440         syslog(LOG_WARNING, "Got non-request message (%d) from socket %d\n",
 441                msg.hdr.msg_type, fd);
 442         return -EPERM;
 443     }
 444
 445     switch (msg.hdr.op_code) {
 446     case RDMACM_MUX_OP_CODE_REG:
 447         rc = add_fd_ifid_pair(fd, msg.hdr.sgid.global.interface_id);
 448         break;
 449
 450     case RDMACM_MUX_OP_CODE_UNREG:
 451         rc = delete_fd_ifid_pair(fd, msg.hdr.sgid.global.interface_id);
 452         break;
 453
 454     case RDMACM_MUX_OP_CODE_MAD:
 455         /* If this is REQ or REP then store the pair comm_id,fd to be later
 456          * used for other messages where gid is unknown */
 457         hdr = (struct umad_hdr *)msg.umad.mad;
 458         attr_id = be16toh(hdr->attr_id);
 459         if ((attr_id == UMAD_CM_ATTR_REQ) || (attr_id == UMAD_CM_ATTR_DREQ) ||
 460             (attr_id == UMAD_CM_ATTR_SIDR_REQ) ||
 461             (attr_id == UMAD_CM_ATTR_REP) || (attr_id == UMAD_CM_ATTR_DREP)) {
 462             comm_id = (uint32_t *)(msg.umad.mad + sizeof(*hdr));
 463             hash_tbl_save_fd_comm_id_pair(fd, *comm_id,
 464                                           msg.hdr.sgid.global.interface_id);
 465         }
 466
 467         syslog(LOG_DEBUG, "vm_to_mad: %d 0x%x 0x%x\n", fd, attr_id,
 468                comm_id ? *comm_id : 0);
 469         rc = umad_send(server.umad_agent.port_id, server.umad_agent.agent_id,
 470                        &msg.umad, msg.umad_len, 1, 0);
 471         if (rc) {
 472             syslog(LOG_ERR,
 473                   "Fail to send MAD message (0x%x) from socket %d, err=%d",
 474                   attr_id, fd, rc);
 475         }
 476         break;
 477
 478     default:
 479         syslog(LOG_ERR, "Got invalid op_code (%d) from socket %d",
 480                msg.hdr.msg_type, fd);
 481         rc = RDMACM_MUX_ERR_CODE_EINVAL;
 482     }
 483
 484     msg.hdr.msg_type = RDMACM_MUX_MSG_TYPE_RESP;
 485     msg.hdr.err_code = rc;
 486     rc = send(fd, &msg, sizeof(msg), 0);
 487
 488     return rc == sizeof(msg) ? 0 : -EPIPE;
 489 }
 490
 491 static int accept_all(void)
 492 {
 493     int fd, rc = 0;
 494
 495     pthread_rwlock_wrlock(&server.lock);
 496
 497     do {
 498         if ((server.nfds + 1) > MAX_CLIENTS) {
 499             syslog(LOG_WARNING, "Too many clients (%d)", server.nfds);
 500             rc = -EIO;
 501             goto out;
 502         }
 503
 504         fd = accept(server.fds[0].fd, NULL, NULL);
 505         if (fd < 0) {
 506             if (errno != EWOULDBLOCK) {
 507                 syslog(LOG_WARNING, "accept() failed");
 508                 rc = -EIO;
 509                 goto out;
 510             }
 511             break;
 512         }
 513
 514         syslog(LOG_INFO, "Client connected on socket %d\n", fd);
 515         server.fds[server.nfds].fd = fd;
 516         server.fds[server.nfds].events = POLLIN;
 517         server.nfds++;
 518     } while (fd != -1);
 519
 520 out:
 521     pthread_rwlock_unlock(&server.lock);
 522     return rc;
 523 }
 524
 525 static void compress_fds(void)
 526 {
 527     int i, j;
 528     int closed = 0;
 529
 530     pthread_rwlock_wrlock(&server.lock);
 531
 532     for (i = 1; i < server.nfds; i++) {
 533         if (!server.fds[i].fd) {
 534             closed++;
 535             for (j = i; j < server.nfds - 1; j++) {
 536                 server.fds[j] = server.fds[j + 1];
 537             }
 538         }
 539     }
 540
 541     server.nfds -= closed;
 542
 543     pthread_rwlock_unlock(&server.lock);
 544 }
 545
 546 static void close_fd(int idx)
 547 {
 548     close(server.fds[idx].fd);
 549     syslog(LOG_INFO, "Socket %d closed\n", server.fds[idx].fd);
 550     hash_tbl_remove_fd_ifid_pair(server.fds[idx].fd);
 551     server.fds[idx].fd = 0;
 552 }
 553
 554 static void run(void)
 555 {
 556     int rc, nfds, i;
 557     bool compress = false;
 558
 559     syslog(LOG_INFO, "Service started");
 560
 561     while (server.run) {
 562         rc = poll(server.fds, server.nfds, SLEEP_SECS * SCALE_US);
 563         if (rc < 0) {
 564             if (errno != EINTR) {
 565                 syslog(LOG_WARNING, "poll() failed");
 566             }
 567             continue;
 568         }
 569
 570         if (rc == 0) {
 571             continue;
 572         }
 573
 574         nfds = server.nfds;
 575         for (i = 0; i < nfds; i++) {
 576             syslog(LOG_DEBUG, "pollfd[%d]: revents 0x%x, events 0x%x\n", i,
 577                    server.fds[i].revents, server.fds[i].events);
 578             if (server.fds[i].revents == 0) {
 579                 continue;
 580             }
 581
 582             if (server.fds[i].revents != POLLIN) {
 583                 if (i == 0) {
 584                     syslog(LOG_NOTICE, "Unexpected poll() event (0x%x)\n",
 585                            server.fds[i].revents);
 586                 } else {
 587                     close_fd(i);
 588                     compress = true;
 589                 }
 590                 continue;
 591             }
 592
 593             if (i == 0) {
 594                 rc = accept_all();
 595                 if (rc) {
 596                     continue;
 597                 }
 598             } else {
 599                 rc = read_and_process(server.fds[i].fd);
 600                 if (rc) {
 601                     close_fd(i);
 602                     compress = true;
 603                 }
 604             }
 605         }
 606
 607         if (compress) {
 608             compress = false;
 609             compress_fds();
 610         }
 611     }
 612 }
 613
 614 static void fini_listener(void)
 615 {
 616     int i;
 617
 618     if (server.fds[0].fd <= 0) {
 619         return;
 620     }
 621
 622     for (i = server.nfds - 1; i >= 0; i--) {
 623         if (server.fds[i].fd) {
 624             close(server.fds[i].fd);
 625         }
 626     }
 627
 628     unlink(server.args.unix_socket_path);
 629 }
 630
 631 static void fini_umad(void)
 632 {
 633     if (server.umad_agent.agent_id) {
 634         umad_unregister(server.umad_agent.port_id, server.umad_agent.agent_id);
 635     }
 636
 637     if (server.umad_agent.port_id) {
 638         umad_close_port(server.umad_agent.port_id);
 639     }
 640
 641     hash_tbl_free();
 642 }
 643
 644 static void fini(void)
 645 {
 646     if (server.umad_recv_thread) {
 647         pthread_join(server.umad_recv_thread, NULL);
 648         server.umad_recv_thread = 0;
 649     }
 650     fini_umad();
 651     fini_listener();
 652     pthread_rwlock_destroy(&server.lock);
 653
 654     syslog(LOG_INFO, "Service going down");
 655 }
 656
 657 static int init_listener(void)
 658 {
 659     struct sockaddr_un sun;
 660     int rc, on = 1;
 661
 662     server.fds[0].fd = socket(AF_UNIX, SOCK_STREAM, 0);
 663     if (server.fds[0].fd < 0) {
 664         syslog(LOG_ALERT, "socket() failed");
 665         return -EIO;
 666     }
 667
 668     rc = setsockopt(server.fds[0].fd, SOL_SOCKET, SO_REUSEADDR, (char *)&on,
 669                     sizeof(on));
 670     if (rc < 0) {
 671         syslog(LOG_ALERT, "setsockopt() failed");
 672         rc = -EIO;
 673         goto err;
 674     }
 675
 676     rc = ioctl(server.fds[0].fd, FIONBIO, (char *)&on);
 677     if (rc < 0) {
 678         syslog(LOG_ALERT, "ioctl() failed");
 679         rc = -EIO;
 680         goto err;
 681     }
 682
 683     if (strlen(server.args.unix_socket_path) >= sizeof(sun.sun_path)) {
 684         syslog(LOG_ALERT,
 685                "Invalid unix_socket_path, size must be less than %ld\n",
 686                sizeof(sun.sun_path));
 687         rc = -EINVAL;
 688         goto err;
 689     }
 690
 691     sun.sun_family = AF_UNIX;
 692     rc = snprintf(sun.sun_path, sizeof(sun.sun_path), "%s",
 693                   server.args.unix_socket_path);
 694     if (rc < 0 || rc >= sizeof(sun.sun_path)) {
 695         syslog(LOG_ALERT, "Could not copy unix socket path\n");
 696         rc = -EINVAL;
 697         goto err;
 698     }
 699
 700     rc = bind(server.fds[0].fd, (struct sockaddr *)&sun, sizeof(sun));
 701     if (rc < 0) {
 702         syslog(LOG_ALERT, "bind() failed");
 703         rc = -EIO;
 704         goto err;
 705     }
 706
 707     rc = listen(server.fds[0].fd, SERVER_LISTEN_BACKLOG);
 708     if (rc < 0) {
 709         syslog(LOG_ALERT, "listen() failed");
 710         rc = -EIO;
 711         goto err;
 712     }
 713
 714     server.fds[0].events = POLLIN;
 715     server.nfds = 1;
 716     server.run = true;
 717
 718     return 0;
 719
 720 err:
 721     close(server.fds[0].fd);
 722     return rc;
 723 }
 724
 725 static int init_umad(void)
 726 {
 727     long method_mask[IB_USER_MAD_LONGS_PER_METHOD_MASK];
 728
 729     server.umad_agent.port_id = umad_open_port(server.args.rdma_dev_name,
 730                                                server.args.rdma_port_num);
 731
 732     if (server.umad_agent.port_id < 0) {
 733         syslog(LOG_WARNING, "umad_open_port() failed");
 734         return -EIO;
 735     }
 736
 737     memset(&method_mask, 0, sizeof(method_mask));
 738     method_mask[0] = MAD_METHOD_MASK0;
 739     server.umad_agent.agent_id = umad_register(server.umad_agent.port_id,
 740                                                UMAD_CLASS_CM,
 741                                                UMAD_SA_CLASS_VERSION,
 742                                                MAD_RMPP_VERSION, method_mask);
 743     if (server.umad_agent.agent_id < 0) {
 744         syslog(LOG_WARNING, "umad_register() failed");
 745         return -EIO;
 746     }
 747
 748     hash_tbl_alloc();
 749
 750     return 0;
 751 }
 752
 753 static void signal_handler(int sig, siginfo_t *siginfo, void *context)
 754 {
 755     static bool warned;
 756
 757     /* Prevent stop if clients are connected */
 758     if (server.nfds != 1) {
 759         if (!warned) {
 760             syslog(LOG_WARNING,
 761                    "Can't stop while active client exist, resend SIGINT to overid");
 762             warned = true;
 763             return;
 764         }
 765     }
 766
 767     if (sig == SIGINT) {
 768         server.run = false;
 769         fini();
 770     }
 771
 772     exit(0);
 773 }
 774
 775 static int init(void)
 776 {
 777     int rc;
 778     struct sigaction sig = {};
 779
 780     rc = init_listener();
 781     if (rc) {
 782         return rc;
 783     }
 784
 785     rc = init_umad();
 786     if (rc) {
 787         return rc;
 788     }
 789
 790     pthread_rwlock_init(&server.lock, 0);
 791
 792     rc = pthread_create(&server.umad_recv_thread, NULL, umad_recv_thread_func,
 793                         NULL);
 794     if (rc) {
 795         syslog(LOG_ERR, "Fail to create UMAD receiver thread (%d)\n", rc);
 796         return rc;
 797     }
 798
 799     sig.sa_sigaction = &signal_handler;
 800     sig.sa_flags = SA_SIGINFO;
 801     rc = sigaction(SIGINT, &sig, NULL);
 802     if (rc < 0) {
 803         syslog(LOG_ERR, "Fail to install SIGINT handler (%d)\n", errno);
 804         return rc;
 805     }
 806
 807     return 0;
 808 }
 809
 810 int main(int argc, char *argv[])
 811 {
 812     int rc;
 813
 814     memset(&server, 0, sizeof(server));
 815
 816     parse_args(argc, argv);
 817
 818     rc = init();
 819     if (rc) {
 820         syslog(LOG_ERR, "Fail to initialize server (%d)\n", rc);
 821         rc = -EAGAIN;
 822         goto out;
 823     }
 824
 825     run();
 826
 827 out:
 828     fini();
 829
 830     return rc;
 831 }