lnet/klnds/gnilnd/gnilnd.c

   1 /*
   2  * Copyright (C) 2012 Cray, Inc.
   3  *
   4  *   Author: Nic Henke <nic@cray.com>
   5  *   Author: James Shimek <jshimek@cray.com>
   6  *
   7  *   This file is part of Lustre, http://www.lustre.org.
   8  *
   9  *   Lustre is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Lustre is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Lustre; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  */
  23 #include "gnilnd.h"
  24
  25 /* Primary entry points from LNET.  There are no guarantees against reentrance. */
  26 lnd_t the_kgnilnd = {
  27 #ifdef CONFIG_CRAY_XT
  28         .lnd_type       = GNILND,
  29 #else
  30         .lnd_type       = GNIIPLND,
  31 #endif
  32         .lnd_startup    = kgnilnd_startup,
  33         .lnd_shutdown   = kgnilnd_shutdown,
  34         .lnd_ctl        = kgnilnd_ctl,
  35         .lnd_send       = kgnilnd_send,
  36         .lnd_recv       = kgnilnd_recv,
  37         .lnd_eager_recv = kgnilnd_eager_recv,
  38         .lnd_query      = kgnilnd_query,
  39 };
  40
  41 kgn_data_t      kgnilnd_data;
  42
  43 /* needs write_lock on kgn_peer_conn_lock */
  44 int
  45 kgnilnd_close_stale_conns_locked(kgn_peer_t *peer, kgn_conn_t *newconn)
  46 {
  47         kgn_conn_t         *conn;
  48         struct list_head   *ctmp, *cnxt;
  49         int                 loopback;
  50         int                 count = 0;
  51
  52         loopback = peer->gnp_nid == peer->gnp_net->gnn_ni->ni_nid;
  53
  54         list_for_each_safe(ctmp, cnxt, &peer->gnp_conns) {
  55                 conn = list_entry(ctmp, kgn_conn_t, gnc_list);
  56
  57                 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
  58                         continue;
  59
  60                 if (conn == newconn)
  61                         continue;
  62
  63                 if (conn->gnc_device != newconn->gnc_device)
  64                         continue;
  65
  66                 /* This is a two connection loopback - one talking to the other */
  67                 if (loopback &&
  68                     newconn->gnc_my_connstamp == conn->gnc_peer_connstamp &&
  69                     newconn->gnc_peer_connstamp == conn->gnc_my_connstamp) {
  70                         CDEBUG(D_NET, "skipping prune of %p, "
  71                                 "loopback and matching stamps"
  72                                 " connstamp "LPU64"("LPU64")"
  73                                 " peerstamp "LPU64"("LPU64")\n",
  74                                 conn, newconn->gnc_my_connstamp,
  75                                 conn->gnc_peer_connstamp,
  76                                 newconn->gnc_peer_connstamp,
  77                                 conn->gnc_my_connstamp);
  78                         continue;
  79                 }
  80
  81                 if (conn->gnc_peerstamp != newconn->gnc_peerstamp) {
  82                         LASSERTF(conn->gnc_peerstamp < newconn->gnc_peerstamp,
  83                                 "conn 0x%p peerstamp "LPU64" >= "
  84                                 "newconn 0x%p peerstamp "LPU64"\n",
  85                                 conn, conn->gnc_peerstamp,
  86                                 newconn, newconn->gnc_peerstamp);
  87
  88                         CDEBUG(D_NET, "Closing stale conn nid: %s "
  89                                " peerstamp:"LPX64"("LPX64")\n",
  90                                libcfs_nid2str(peer->gnp_nid),
  91                                conn->gnc_peerstamp, newconn->gnc_peerstamp);
  92                 } else {
  93
  94                         LASSERTF(conn->gnc_peer_connstamp < newconn->gnc_peer_connstamp,
  95                                 "conn 0x%p peer_connstamp "LPU64" >= "
  96                                 "newconn 0x%p peer_connstamp "LPU64"\n",
  97                                 conn, conn->gnc_peer_connstamp,
  98                                 newconn, newconn->gnc_peer_connstamp);
  99
 100                         CDEBUG(D_NET, "Closing stale conn nid: %s"
 101                                " connstamp:"LPU64"("LPU64")\n",
 102                                libcfs_nid2str(peer->gnp_nid),
 103                                conn->gnc_peer_connstamp, newconn->gnc_peer_connstamp);
 104                 }
 105
 106                 count++;
 107                 kgnilnd_close_conn_locked(conn, -ESTALE);
 108         }
 109
 110         if (count != 0) {
 111                 CWARN("Closed %d stale conns to %s\n", count, libcfs_nid2str(peer->gnp_nid));
 112         }
 113
 114         RETURN(count);
 115 }
 116
 117 int
 118 kgnilnd_conn_isdup_locked(kgn_peer_t *peer, kgn_conn_t *newconn)
 119 {
 120         kgn_conn_t       *conn;
 121         struct list_head *tmp;
 122         int               loopback;
 123         ENTRY;
 124
 125         loopback = peer->gnp_nid == peer->gnp_net->gnn_ni->ni_nid;
 126
 127         list_for_each(tmp, &peer->gnp_conns) {
 128                 conn = list_entry(tmp, kgn_conn_t, gnc_list);
 129                 CDEBUG(D_NET, "checking conn 0x%p for peer %s"
 130                         " lo %d new "LPU64" existing "LPU64
 131                         " new peer "LPU64" existing peer "LPU64
 132                         " new dev %p existing dev %p\n",
 133                         conn, libcfs_nid2str(peer->gnp_nid),
 134                         loopback,
 135                         newconn->gnc_peerstamp, conn->gnc_peerstamp,
 136                         newconn->gnc_peer_connstamp, conn->gnc_peer_connstamp,
 137                         newconn->gnc_device, conn->gnc_device);
 138
 139                 /* conn is in the process of closing */
 140                 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
 141                         continue;
 142
 143                 /* 'newconn' is from an earlier version of 'peer'!!! */
 144                 if (newconn->gnc_peerstamp < conn->gnc_peerstamp)
 145                         RETURN(1);
 146
 147                 /* 'conn' is from an earlier version of 'peer': it will be
 148                  * removed when we cull stale conns later on... */
 149                 if (newconn->gnc_peerstamp > conn->gnc_peerstamp)
 150                         continue;
 151
 152                 /* Different devices are OK */
 153                 if (conn->gnc_device != newconn->gnc_device)
 154                         continue;
 155
 156                 /* It's me connecting to myself */
 157                 if (loopback &&
 158                     newconn->gnc_my_connstamp == conn->gnc_peer_connstamp &&
 159                     newconn->gnc_peer_connstamp == conn->gnc_my_connstamp)
 160                         continue;
 161
 162                 /* 'newconn' is an earlier connection from 'peer'!!! */
 163                 if (newconn->gnc_peer_connstamp < conn->gnc_peer_connstamp)
 164                         RETURN(2);
 165
 166                 /* 'conn' is an earlier connection from 'peer': it will be
 167                  * removed when we cull stale conns later on... */
 168                 if (newconn->gnc_peer_connstamp > conn->gnc_peer_connstamp)
 169                         continue;
 170
 171                 /* 'newconn' has the SAME connection stamp; 'peer' isn't
 172                  * playing the game... */
 173                 RETURN(3);
 174         }
 175
 176         RETURN(0);
 177 }
 178
 179 int
 180 kgnilnd_create_conn(kgn_conn_t **connp, kgn_device_t *dev)
 181 {
 182         kgn_conn_t      *conn;
 183         gni_return_t    rrc;
 184         int             rc = 0;
 185
 186         LASSERT (!in_interrupt());
 187         atomic_inc(&kgnilnd_data.kgn_nconns);
 188
 189         /* divide by 2 to allow for complete reset and immediate reconnect */
 190         if (atomic_read(&kgnilnd_data.kgn_nconns) >= GNILND_MAX_CQID/2) {
 191                 CERROR("Too many conn are live: %d > %d\n",
 192                         atomic_read(&kgnilnd_data.kgn_nconns), GNILND_MAX_CQID/2);
 193                 atomic_dec(&kgnilnd_data.kgn_nconns);
 194                 return -E2BIG;
 195         }
 196
 197         LIBCFS_ALLOC(conn, sizeof(*conn));
 198         if (conn == NULL) {
 199                 atomic_dec(&kgnilnd_data.kgn_nconns);
 200                 return -ENOMEM;
 201         }
 202
 203         LIBCFS_ALLOC(conn->gnc_tx_ref_table, GNILND_MAX_MSG_ID * sizeof(void *));
 204         if (conn->gnc_tx_ref_table == NULL) {
 205                 CERROR("Can't allocate conn tx_ref_table\n");
 206                 GOTO(failed, rc = -ENOMEM);
 207         }
 208
 209         atomic_set(&conn->gnc_refcount, 1);
 210         atomic_set(&conn->gnc_reaper_noop, 0);
 211         atomic_set(&conn->gnc_sched_noop, 0);
 212         atomic_set(&conn->gnc_tx_in_use, 0);
 213         INIT_LIST_HEAD(&conn->gnc_list);
 214         INIT_LIST_HEAD(&conn->gnc_hashlist);
 215         INIT_LIST_HEAD(&conn->gnc_schedlist);
 216         INIT_LIST_HEAD(&conn->gnc_fmaq);
 217         INIT_LIST_HEAD(&conn->gnc_mdd_list);
 218         spin_lock_init(&conn->gnc_list_lock);
 219         spin_lock_init(&conn->gnc_tx_lock);
 220         conn->gnc_magic = GNILND_CONN_MAGIC;
 221
 222         /* set tx id to nearly the end to make sure we find wrapping
 223          * issues soon */
 224         conn->gnc_next_tx = (int) GNILND_MAX_MSG_ID - 10;
 225
 226         /* if this fails, we have conflicts and MAX_TX is too large */
 227         CLASSERT(GNILND_MAX_MSG_ID < GNILND_MSGID_CLOSE);
 228
 229         /* get a new unique CQ id for this conn */
 230         write_lock(&kgnilnd_data.kgn_peer_conn_lock);
 231         conn->gnc_my_connstamp = kgnilnd_data.kgn_connstamp++;
 232         conn->gnc_cqid = kgnilnd_get_cqid_locked();
 233         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
 234
 235         if (conn->gnc_cqid == 0) {
 236                 CERROR("Could not allocate unique CQ ID for conn 0x%p\n", conn);
 237                 GOTO(failed, rc = -E2BIG);
 238         }
 239
 240         CDEBUG(D_NET, "alloc cqid %u for conn 0x%p\n",
 241                 conn->gnc_cqid, conn);
 242
 243         /* need to be set before gnc_ephandle to allow kgnilnd_destroy_conn_ep to
 244          * check context */
 245         conn->gnc_device = dev;
 246
 247         conn->gnc_timeout = MAX(*kgnilnd_tunables.kgn_timeout,
 248                                 GNILND_MIN_TIMEOUT);
 249         kgnilnd_update_reaper_timeout(conn->gnc_timeout);
 250
 251         /* this is the ep_handle for doing SMSG & BTE */
 252         mutex_lock(&dev->gnd_cq_mutex);
 253         rrc = kgnilnd_ep_create(dev->gnd_handle, dev->gnd_snd_fma_cqh,
 254                                 &conn->gnc_ephandle);
 255         mutex_unlock(&dev->gnd_cq_mutex);
 256         if (rrc != GNI_RC_SUCCESS)
 257                 GOTO(failed, rc = -ENETDOWN);
 258
 259         CDEBUG(D_NET, "created conn 0x%p ep_hndl 0x%p\n",
 260                conn, conn->gnc_ephandle);
 261
 262         /* add ref for EP canceling */
 263         kgnilnd_conn_addref(conn);
 264         atomic_inc(&dev->gnd_neps);
 265
 266         *connp = conn;
 267         return 0;
 268
 269 failed:
 270         atomic_dec(&kgnilnd_data.kgn_nconns);
 271         LIBCFS_FREE(conn->gnc_tx_ref_table, GNILND_MAX_MSG_ID * sizeof(void *));
 272         LIBCFS_FREE(conn, sizeof(*conn));
 273         return rc;
 274 }
 275
 276 /* needs to be called with kgn_peer_conn_lock held (read or write) */
 277 kgn_conn_t *
 278 kgnilnd_find_conn_locked(kgn_peer_t *peer)
 279 {
 280         kgn_conn_t      *conn = NULL;
 281
 282         /* if we are in reset, this conn is going to die soon */
 283         if (unlikely(kgnilnd_data.kgn_in_reset)) {
 284                 RETURN(NULL);
 285         }
 286
 287         /* just return the first ESTABLISHED connection */
 288         list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
 289                 /* kgnilnd_finish_connect doesn't put connections on the
 290                  * peer list until they are actually established */
 291                 LASSERTF(conn->gnc_state >= GNILND_CONN_ESTABLISHED,
 292                         "found conn %p state %s on peer %p (%s)\n",
 293                         conn, kgnilnd_conn_state2str(conn), peer,
 294                         libcfs_nid2str(peer->gnp_nid));
 295                 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
 296                         continue;
 297
 298                 RETURN(conn);
 299         }
 300         RETURN(NULL);
 301 }
 302
 303 /* needs write_lock on kgn_peer_conn_lock held */
 304 kgn_conn_t *
 305 kgnilnd_find_or_create_conn_locked(kgn_peer_t *peer) {
 306
 307         kgn_device_t    *dev = peer->gnp_net->gnn_dev;
 308         kgn_conn_t      *conn;
 309
 310         conn = kgnilnd_find_conn_locked(peer);
 311
 312         if (conn != NULL) {
 313                 return conn;
 314         }
 315
 316         /* if the peer was previously connecting, check if we should
 317          * trigger another connection attempt yet. */
 318         if (time_before(jiffies, peer->gnp_reconnect_time)) {
 319                 return NULL;
 320         }
 321
 322         /* This check prevents us from creating a new connection to a peer while we are
 323          * still in the process of closing an existing connection to the peer.
 324          */
 325         list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
 326                 if (conn->gnc_ephandle != NULL) {
 327                         CDEBUG(D_NET, "Not connecting non-null ephandle found peer 0x%p->%s\n", peer,
 328                                 libcfs_nid2str(peer->gnp_nid));
 329                         return NULL;
 330                 }
 331         }
 332
 333         if (peer->gnp_connecting != GNILND_PEER_IDLE) {
 334                 /* if we are not connecting, fire up a new connection */
 335                 /* or if we are anything but IDLE DONT start a new connection */
 336                return NULL;
 337         }
 338
 339         CDEBUG(D_NET, "starting connect to %s\n",
 340                 libcfs_nid2str(peer->gnp_nid));
 341         peer->gnp_connecting = GNILND_PEER_CONNECT;
 342         kgnilnd_peer_addref(peer); /* extra ref for connd */
 343
 344         spin_lock(&dev->gnd_connd_lock);
 345         list_add_tail(&peer->gnp_connd_list, &dev->gnd_connd_peers);
 346         spin_unlock(&dev->gnd_connd_lock);
 347
 348         kgnilnd_schedule_dgram(dev);
 349         CDEBUG(D_NETTRACE, "scheduling new connect\n");
 350
 351         return NULL;
 352 }
 353
 354 /* Caller is responsible for deciding if/when to call this */
 355 void
 356 kgnilnd_destroy_conn_ep(kgn_conn_t *conn)
 357 {
 358         gni_return_t    rrc;
 359         gni_ep_handle_t tmp_ep;
 360
 361         /* only if we actually initialized it,
 362          *  then set NULL to tell kgnilnd_destroy_conn to leave it alone */
 363
 364         tmp_ep = xchg(&conn->gnc_ephandle, NULL);
 365         if (tmp_ep != NULL) {
 366                 /* we never re-use the EP, so unbind is not needed */
 367                 mutex_lock(&conn->gnc_device->gnd_cq_mutex);
 368                 rrc = kgnilnd_ep_destroy(tmp_ep);
 369
 370                 mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
 371
 372                 /* if this fails, it could hork up kgni smsg retransmit and others
 373                  * since we could free the SMSG mbox memory, etc. */
 374                 LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d conn 0x%p ep 0x%p\n",
 375                          rrc, conn, conn->gnc_ephandle);
 376
 377                 atomic_dec(&conn->gnc_device->gnd_neps);
 378
 379                 /* clear out count added in kgnilnd_close_conn_locked
 380                  * conn will have a peer once it hits finish_connect, where it
 381                  * is the first spot we'll mark it ESTABLISHED as well */
 382                 if (conn->gnc_peer) {
 383                         kgnilnd_admin_decref(conn->gnc_peer->gnp_dirty_eps);
 384                 }
 385
 386                 /* drop ref for EP */
 387                 kgnilnd_conn_decref(conn);
 388         }
 389 }
 390
 391 void
 392 kgnilnd_destroy_conn(kgn_conn_t *conn)
 393 {
 394         LASSERTF(!in_interrupt() &&
 395                 !conn->gnc_scheduled &&
 396                 !conn->gnc_in_purgatory &&
 397                 conn->gnc_ephandle == NULL &&
 398                 list_empty(&conn->gnc_list) &&
 399                 list_empty(&conn->gnc_hashlist) &&
 400                 list_empty(&conn->gnc_schedlist) &&
 401                 list_empty(&conn->gnc_mdd_list) &&
 402                 conn->gnc_magic == GNILND_CONN_MAGIC,
 403                 "conn 0x%p->%s IRQ %d sched %d purg %d ep 0x%p Mg %d lists %d/%d/%d/%d\n",
 404                 conn, conn->gnc_peer ? libcfs_nid2str(conn->gnc_peer->gnp_nid)
 405                                      : "<?>",
 406                 !!in_interrupt(), conn->gnc_scheduled,
 407                 conn->gnc_in_purgatory,
 408                 conn->gnc_ephandle,
 409                 conn->gnc_magic,
 410                 list_empty(&conn->gnc_list),
 411                 list_empty(&conn->gnc_hashlist),
 412                 list_empty(&conn->gnc_schedlist),
 413                 list_empty(&conn->gnc_mdd_list));
 414
 415         /* Tripping these is especially bad, as it means we have items on the
 416          *  lists that didn't keep their refcount on the connection - or
 417          *  somebody evil released their own */
 418         LASSERTF(list_empty(&conn->gnc_fmaq) &&
 419                  atomic_read(&conn->gnc_nlive_fma) == 0 &&
 420                  atomic_read(&conn->gnc_nlive_rdma) == 0,
 421                  "conn 0x%p fmaq %d@0x%p nfma %d nrdma %d\n",
 422                  conn, kgnilnd_count_list(&conn->gnc_fmaq), &conn->gnc_fmaq,
 423                  atomic_read(&conn->gnc_nlive_fma), atomic_read(&conn->gnc_nlive_rdma));
 424
 425         CDEBUG(D_NET, "destroying conn %p ephandle %p error %d\n",
 426                 conn, conn->gnc_ephandle, conn->gnc_error);
 427
 428         /* We are freeing this memory remove the magic value from the connection */
 429         conn->gnc_magic = 0;
 430
 431         /* if there is an FMA blk left here, we'll tear it down */
 432         if (conn->gnc_fma_blk) {
 433                 if (conn->gnc_peer) {
 434                         kgn_mbox_info_t *mbox;
 435                         mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
 436                         mbox->mbx_prev_nid = conn->gnc_peer->gnp_nid;
 437                 }
 438                 kgnilnd_release_mbox(conn, 0);
 439         }
 440
 441         if (conn->gnc_peer != NULL)
 442                 kgnilnd_peer_decref(conn->gnc_peer);
 443
 444         if (conn->gnc_tx_ref_table != NULL) {
 445                 LIBCFS_FREE(conn->gnc_tx_ref_table,
 446                             GNILND_MAX_MSG_ID * sizeof(void *));
 447         }
 448
 449         LIBCFS_FREE(conn, sizeof(*conn));
 450         atomic_dec(&kgnilnd_data.kgn_nconns);
 451 }
 452
 453 /* peer_alive and peer_notify done in the style of the o2iblnd */
 454 void
 455 kgnilnd_peer_alive(kgn_peer_t *peer)
 456 {
 457         set_mb(peer->gnp_last_alive, jiffies);
 458 }
 459
 460 void
 461 kgnilnd_peer_notify(kgn_peer_t *peer, int error)
 462 {
 463         int                     tell_lnet = 0;
 464         int                     nnets = 0;
 465         int                     rc;
 466         int                     i, j;
 467         kgn_conn_t             *conn;
 468         kgn_net_t             **nets;
 469         kgn_net_t              *net;
 470
 471
 472         if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DONT_NOTIFY))
 473                 return;
 474
 475         /* Tell LNet we are giving ups on this peer - but only
 476          * if it isn't already reconnected or trying to reconnect */
 477         read_lock(&kgnilnd_data.kgn_peer_conn_lock);
 478
 479         /* use kgnilnd_find_conn_locked to avoid any conns in the process of being nuked
 480          *
 481          * don't tell LNet if we are in reset - we assume that everyone will be able to
 482          * reconnect just fine
 483          */
 484         conn = kgnilnd_find_conn_locked(peer);
 485
 486         CDEBUG(D_NETTRACE, "peer 0x%p->%s ting %d conn 0x%p, rst %d error %d\n",
 487                peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting, conn,
 488                kgnilnd_data.kgn_in_reset, error);
 489
 490         if ((peer->gnp_connecting == GNILND_PEER_IDLE) &&
 491             (conn == NULL) &&
 492             (!kgnilnd_data.kgn_in_reset) &&
 493             (!kgnilnd_conn_clean_errno(error))) {
 494                 tell_lnet = 1;
 495         }
 496
 497         read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
 498
 499         if (!tell_lnet) {
 500                 /* short circuit if we dont need to notify Lnet */
 501                 return;
 502         }
 503
 504         rc = down_read_trylock(&kgnilnd_data.kgn_net_rw_sem);
 505
 506         if (rc) {
 507             /* dont do this if this fails since LNET is in shutdown or something else
 508              */
 509
 510                 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
 511                         list_for_each_entry(net , &kgnilnd_data.kgn_nets[i], gnn_list) {
 512                                 /* if gnn_shutdown set for any net shutdown is in progress just return */
 513                                 if (net->gnn_shutdown) {
 514                                         up_read(&kgnilnd_data.kgn_net_rw_sem);
 515                                         return;
 516                                 }
 517                                 nnets++;
 518                         }
 519                 }
 520
 521                 if (nnets == 0) {
 522                         /* shutdown in progress most likely */
 523                         up_read(&kgnilnd_data.kgn_net_rw_sem);
 524                         return;
 525                 }
 526
 527                 LIBCFS_ALLOC(nets, nnets * sizeof(*nets));
 528
 529                 if (nets == NULL) {
 530                         up_read(&kgnilnd_data.kgn_net_rw_sem);
 531                         CERROR("Failed to allocate nets[%d]\n", nnets);
 532                         return;
 533                 }
 534
 535                 j = 0;
 536                 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
 537                         list_for_each_entry(net, &kgnilnd_data.kgn_nets[i], gnn_list) {
 538                                 nets[j] = net;
 539                                 kgnilnd_net_addref(net);
 540                                 j++;
 541                         }
 542                 }
 543                 up_read(&kgnilnd_data.kgn_net_rw_sem);
 544
 545                 for (i = 0; i < nnets; i++) {
 546                         lnet_nid_t peer_nid;
 547
 548                         net = nets[i];
 549
 550                         peer_nid = kgnilnd_lnd2lnetnid(net->gnn_ni->ni_nid,
 551                                                                  peer->gnp_nid);
 552
 553                         CDEBUG(D_NET, "peer 0x%p->%s last_alive %lu (%lus ago)\n",
 554                                 peer, libcfs_nid2str(peer_nid), peer->gnp_last_alive,
 555                                 cfs_duration_sec(jiffies - peer->gnp_last_alive));
 556
 557                         lnet_notify(net->gnn_ni, peer_nid, 0, peer->gnp_last_alive);
 558
 559
 560                         kgnilnd_net_decref(net);
 561                 }
 562
 563                 LIBCFS_FREE(nets, nnets * sizeof(*nets));
 564         }
 565 }
 566
 567 /* need write_lock on kgn_peer_conn_lock */
 568 void
 569 kgnilnd_close_conn_locked(kgn_conn_t *conn, int error)
 570 {
 571         kgn_peer_t        *peer = conn->gnc_peer;
 572         ENTRY;
 573
 574         LASSERT(!in_interrupt());
 575
 576         /* store error for tx completion */
 577         conn->gnc_error = error;
 578         peer->gnp_last_errno = error;
 579
 580         /* use real error from peer if possible */
 581         if (error == -ECONNRESET) {
 582                 error = conn->gnc_peer_error;
 583         }
 584
 585         /* if we NETERROR, make sure it is rate limited */
 586         if (!kgnilnd_conn_clean_errno(error) &&
 587             peer->gnp_down == GNILND_RCA_NODE_UP) {
 588                 CNETERR("closing conn to %s: error %d\n",
 589                        libcfs_nid2str(peer->gnp_nid), error);
 590         } else {
 591                 CDEBUG(D_NET, "closing conn to %s: error %d\n",
 592                        libcfs_nid2str(peer->gnp_nid), error);
 593         }
 594
 595         LASSERTF(conn->gnc_state == GNILND_CONN_ESTABLISHED,
 596                 "conn %p to %s with bogus state %s\n", conn,
 597                 libcfs_nid2str(conn->gnc_peer->gnp_nid),
 598                 kgnilnd_conn_state2str(conn));
 599         LASSERT(!list_empty(&conn->gnc_hashlist));
 600         LASSERT(!list_empty(&conn->gnc_list));
 601
 602
 603         /* mark peer count here so any place the EP gets destroyed will
 604          * open up the peer count so that a new ESTABLISHED conn is then free
 605          * to send new messages -- sending before the previous EPs are destroyed
 606          * could end up with messages on the network for the old conn _after_
 607          * the new conn and break the mbox safety protocol */
 608         kgnilnd_admin_addref(conn->gnc_peer->gnp_dirty_eps);
 609
 610         /* Remove from conn hash table: no new callbacks */
 611         list_del_init(&conn->gnc_hashlist);
 612         kgnilnd_data.kgn_conn_version++;
 613         kgnilnd_conn_decref(conn);
 614
 615         /* if we are in reset, go right to CLOSED as there is no scheduler
 616          * thread to move from CLOSING to CLOSED */
 617         if (unlikely(kgnilnd_data.kgn_in_reset)) {
 618                 conn->gnc_state = GNILND_CONN_CLOSED;
 619         } else {
 620                 conn->gnc_state = GNILND_CONN_CLOSING;
 621         }
 622
 623         /* leave on peer->gnp_conns to make sure we don't let the reaper
 624          * or others try to unlink this peer until the conn is fully
 625          * processed for closing */
 626
 627         if (kgnilnd_check_purgatory_conn(conn)) {
 628                 kgnilnd_add_purgatory_locked(conn, conn->gnc_peer);
 629         }
 630
 631         /* Reset RX timeout to ensure we wait for an incoming CLOSE
 632          * for the full timeout.  If we get a CLOSE we know the
 633          * peer has stopped all RDMA.  Otherwise if we wait for
 634          * the full timeout we can also be sure all RDMA has stopped. */
 635         conn->gnc_last_rx = conn->gnc_last_rx_cq = jiffies;
 636         mb();
 637
 638         /* schedule sending CLOSE - if we are in quiesce, this adds to
 639          * gnd_ready_conns and allows us to find it in quiesce processing */
 640         kgnilnd_schedule_conn(conn);
 641
 642         EXIT;
 643 }
 644
 645 void
 646 kgnilnd_close_conn(kgn_conn_t *conn, int error)
 647 {
 648         write_lock(&kgnilnd_data.kgn_peer_conn_lock);
 649         /* need to check the state here - this call is racy and we don't
 650          * know the state until after the lock is grabbed */
 651         if (conn->gnc_state == GNILND_CONN_ESTABLISHED) {
 652                 kgnilnd_close_conn_locked(conn, error);
 653         }
 654         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
 655 }
 656
 657 void
 658 kgnilnd_complete_closed_conn(kgn_conn_t *conn)
 659 {
 660         LIST_HEAD               (sinners);
 661         kgn_tx_t               *tx, *txn;
 662         int                     nlive = 0;
 663         int                     nrdma = 0;
 664         int                     nq_rdma = 0;
 665         int                     logmsg;
 666         ENTRY;
 667
 668         /* Dump log  on cksum error - wait until complete phase to let
 669          * RX of error happen */
 670         if (*kgnilnd_tunables.kgn_checksum_dump &&
 671             (conn != NULL && conn->gnc_peer_error == -ENOKEY)) {
 672                 libcfs_debug_dumplog();
 673         }
 674
 675         /* _CLOSED set in kgnilnd_process_fmaq once we decide to
 676          * send the CLOSE or not */
 677         LASSERTF(conn->gnc_state == GNILND_CONN_CLOSED,
 678                  "conn 0x%p->%s with bad state %s\n",
 679                  conn, conn->gnc_peer ?
 680                         libcfs_nid2str(conn->gnc_peer->gnp_nid) :
 681                         "<?>",
 682                  kgnilnd_conn_state2str(conn));
 683
 684         LASSERT(list_empty(&conn->gnc_hashlist));
 685
 686         /* we've sent the close, start nuking */
 687         if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SCHEDULE_COMPLETE))
 688                 kgnilnd_schedule_conn(conn);
 689
 690         if (conn->gnc_scheduled != GNILND_CONN_PROCESS) {
 691                 CDEBUG(D_NETERROR, "Error someone scheduled us after we were "
 692                                 "done, Attempting to recover conn 0x%p "
 693                                 "scheduled %d function: %s line: %d\n", conn,
 694                                 conn->gnc_scheduled, conn->gnc_sched_caller,
 695                                 conn->gnc_sched_line);
 696                 RETURN_EXIT;
 697         }
 698
 699         /* we don't use lists to track things that we can get out of the
 700          * tx_ref table... */
 701
 702         /* need to hold locks for tx_list_state, sampling it is too racy:
 703          * - the lock actually protects tx != NULL, but we can't take the proper
 704          *   lock until we check tx_list_state, which would be too late and
 705          *   we could have the TX change under us.
 706          * gnd_rdmaq_lock and gnd_lock and not used together, so taking both
 707          * should be fine */
 708         spin_lock(&conn->gnc_device->gnd_rdmaq_lock);
 709         spin_lock(&conn->gnc_device->gnd_lock);
 710
 711         for (nrdma = 0; nrdma < GNILND_MAX_MSG_ID; nrdma++) {
 712                 tx = conn->gnc_tx_ref_table[nrdma];
 713
 714                 if (tx != NULL) {
 715                         /* only print the first error and if not CLOSE, we often don't see
 716                          * CQ events for that by the time we get here... and really don't care */
 717                         if (nlive || tx->tx_msg.gnm_type == GNILND_MSG_CLOSE)
 718                                 tx->tx_state |= GNILND_TX_QUIET_ERROR;
 719                         nlive++;
 720                         GNIDBG_TX(D_NET, tx, "cleaning up on close, nlive %d", nlive);
 721
 722                         /* don't worry about gnc_lock here as nobody else should be
 723                          * touching this conn */
 724                         kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
 725                         list_add_tail(&tx->tx_list, &sinners);
 726                 }
 727         }
 728         spin_unlock(&conn->gnc_device->gnd_lock);
 729         spin_unlock(&conn->gnc_device->gnd_rdmaq_lock);
 730
 731         /* nobody should have marked this as needing scheduling after
 732          * we called close - so only ref should be us handling it */
 733         if (conn->gnc_scheduled != GNILND_CONN_PROCESS) {
 734                 CDEBUG(D_NETERROR, "Error someone scheduled us after we were "
 735                                 "done, Attempting to recover conn 0x%p "
 736                                 "scheduled %d function %s line: %d\n", conn,
 737                                 conn->gnc_scheduled, conn->gnc_sched_caller,
 738                                 conn->gnc_sched_line);
 739         }
 740         /* now reset a few to actual counters... */
 741         nrdma = atomic_read(&conn->gnc_nlive_rdma);
 742         nq_rdma = atomic_read(&conn->gnc_nq_rdma);
 743
 744         if (!list_empty(&sinners)) {
 745                 list_for_each_entry_safe(tx, txn, &sinners, tx_list) {
 746                         /* clear tx_list to make tx_add_list_locked happy */
 747                         list_del_init(&tx->tx_list);
 748                         /* The error codes determine if we hold onto the MDD */
 749                         kgnilnd_tx_done(tx, conn->gnc_error);
 750                 }
 751         }
 752
 753         logmsg = (nlive + nrdma + nq_rdma);
 754
 755         if (logmsg) {
 756                 if (conn->gnc_peer->gnp_down == GNILND_RCA_NODE_UP) {
 757                         CNETERR("Closed conn 0x%p->%s (errno %d, peer errno %d): "
 758                                 "canceled %d TX, %d/%d RDMA\n",
 759                                 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
 760                                 conn->gnc_error, conn->gnc_peer_error,
 761                                 nlive, nq_rdma, nrdma);
 762                 } else {
 763                         CDEBUG(D_NET, "Closed conn 0x%p->%s (errno %d,"
 764                                 " peer errno %d): canceled %d TX, %d/%d RDMA\n",
 765                                 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
 766                                 conn->gnc_error, conn->gnc_peer_error,
 767                                 nlive, nq_rdma, nrdma);
 768                 }
 769         }
 770
 771         kgnilnd_destroy_conn_ep(conn);
 772
 773         /* Bug 765042 - race this with completing a new conn to same peer - we need
 774          * finish_connect to detach purgatory before we can do it ourselves here */
 775         CFS_RACE(CFS_FAIL_GNI_FINISH_PURG);
 776
 777         /* now it is safe to remove from peer list - anyone looking at
 778          * gnp_conns now is free to unlink if not on purgatory */
 779         write_lock(&kgnilnd_data.kgn_peer_conn_lock);
 780
 781         conn->gnc_state = GNILND_CONN_DONE;
 782
 783         /* Decrement counter if we are marked by del_conn_or_peers for closing
 784          */
 785         if (conn->gnc_needs_closing)
 786                 kgnilnd_admin_decref(kgnilnd_data.kgn_npending_conns);
 787
 788         /* Remove from peer's list of valid connections if its not in purgatory */
 789         if (!conn->gnc_in_purgatory) {
 790                 list_del_init(&conn->gnc_list);
 791                 /* Lose peers reference on the conn */
 792                 kgnilnd_conn_decref(conn);
 793         }
 794
 795         /* NB - only unlinking if we set pending in del_peer_locked from admin or
 796          * shutdown */
 797         if (kgnilnd_peer_active(conn->gnc_peer) &&
 798             conn->gnc_peer->gnp_pending_unlink &&
 799             kgnilnd_can_unlink_peer_locked(conn->gnc_peer)) {
 800                 kgnilnd_unlink_peer_locked(conn->gnc_peer);
 801         }
 802
 803         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
 804
 805         /* I'm telling Mommy! - use peer_error if they initiated close */
 806         kgnilnd_peer_notify(conn->gnc_peer,
 807                             conn->gnc_error == -ECONNRESET ? conn->gnc_peer_error
 808                                                            : conn->gnc_error);
 809
 810         EXIT;
 811 }
 812
 813 int
 814 kgnilnd_set_conn_params(kgn_dgram_t *dgram)
 815 {
 816         kgn_conn_t             *conn = dgram->gndg_conn;
 817         kgn_connreq_t          *connreq = &dgram->gndg_conn_in;
 818         kgn_gniparams_t        *rem_param = &connreq->gncr_gnparams;
 819         gni_return_t            rrc;
 820         int                     rc = 0;
 821         gni_smsg_attr_t        *remote = &connreq->gncr_gnparams.gnpr_smsg_attr;
 822
 823         /* set timeout vals in conn early so we can use them for the NAK */
 824
 825         /* use max of the requested and our timeout, peer will do the same */
 826         conn->gnc_timeout = MAX(conn->gnc_timeout, connreq->gncr_timeout);
 827
 828         /* only ep_bind really mucks around with the CQ */
 829         /* only ep bind if we are not connecting to ourself and the dstnid is not a wildcard. this check
 830          * is necessary as you can only bind an ep once and we must make sure we dont bind when already bound.
 831          */
 832         if (connreq->gncr_dstnid != LNET_NID_ANY && dgram->gndg_conn_out.gncr_dstnid != connreq->gncr_srcnid) {
 833                 mutex_lock(&conn->gnc_device->gnd_cq_mutex);
 834                 rrc = kgnilnd_ep_bind(conn->gnc_ephandle,
 835                         connreq->gncr_gnparams.gnpr_host_id,
 836                         conn->gnc_cqid);
 837                 mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
 838                 if (rrc != GNI_RC_SUCCESS) {
 839                         rc = -ECONNABORTED;
 840                         goto return_out;
 841                 }
 842         }
 843
 844         rrc = kgnilnd_ep_set_eventdata(conn->gnc_ephandle, conn->gnc_cqid,
 845                          connreq->gncr_gnparams.gnpr_cqid);
 846         if (rrc != GNI_RC_SUCCESS) {
 847                 rc = -ECONNABORTED;
 848                 goto cleanup_out;
 849         }
 850
 851         /* Initialize SMSG */
 852         rrc = kgnilnd_smsg_init(conn->gnc_ephandle, &conn->gnpr_smsg_attr,
 853                         &connreq->gncr_gnparams.gnpr_smsg_attr);
 854         if (unlikely(rrc == GNI_RC_INVALID_PARAM)) {
 855                 gni_smsg_attr_t *local = &conn->gnpr_smsg_attr;
 856                 /* help folks figure out if there is a tunable off, etc. */
 857                 LCONSOLE_ERROR("SMSG attribute mismatch. Data from local/remote:"
 858                                " type %d/%d msg_maxsize %u/%u"
 859                                " mbox_maxcredit %u/%u. Please check kgni"
 860                                " logs for further data\n",
 861                                local->msg_type, remote->msg_type,
 862                                local->msg_maxsize, remote->msg_maxsize,
 863                                local->mbox_maxcredit, remote->mbox_maxcredit);
 864         }
 865         if (rrc != GNI_RC_SUCCESS) {
 866                 rc = -ECONNABORTED;
 867                 goto cleanup_out;
 868         }
 869
 870         /* log this for help in debuggin SMSG buffer re-use */
 871         CDEBUG(D_NET, "conn %p src %s dst %s smsg %p acquired"
 872                 " local cqid %u SMSG %p->%u hndl "LPX64"."LPX64
 873                 " remote cqid %u SMSG %p->%u hndl "LPX64"."LPX64"\n",
 874                 conn, libcfs_nid2str(connreq->gncr_srcnid),
 875                 libcfs_nid2str(connreq->gncr_dstnid),
 876                 &conn->gnpr_smsg_attr,
 877                 conn->gnc_cqid,
 878                 conn->gnpr_smsg_attr.msg_buffer,
 879                 conn->gnpr_smsg_attr.mbox_offset,
 880                 conn->gnpr_smsg_attr.mem_hndl.qword1,
 881                 conn->gnpr_smsg_attr.mem_hndl.qword2,
 882                 rem_param->gnpr_cqid,
 883                 rem_param->gnpr_smsg_attr.msg_buffer,
 884                 rem_param->gnpr_smsg_attr.mbox_offset,
 885                 rem_param->gnpr_smsg_attr.mem_hndl.qword1,
 886                 rem_param->gnpr_smsg_attr.mem_hndl.qword2);
 887
 888         conn->gnc_peerstamp = connreq->gncr_peerstamp;
 889         conn->gnc_peer_connstamp = connreq->gncr_connstamp;
 890         conn->remote_mbox_addr = (void *)((char *)remote->msg_buffer + remote->mbox_offset);
 891
 892         /* We update the reaper timeout once we have a valid conn and timeout */
 893         kgnilnd_update_reaper_timeout(GNILND_TO2KA(conn->gnc_timeout));
 894
 895         return 0;
 896
 897 cleanup_out:
 898         rrc = kgnilnd_ep_unbind(conn->gnc_ephandle);
 899         /* not sure I can just let this fly */
 900         LASSERTF(rrc == GNI_RC_SUCCESS,
 901                 "bad rc from gni_ep_unbind trying to cleanup: %d\n", rrc);
 902
 903 return_out:
 904         LASSERTF(rc != 0, "SOFTWARE BUG: rc == 0\n");
 905         CERROR("Error setting connection params from %s: %d\n",
 906                libcfs_nid2str(connreq->gncr_srcnid), rc);
 907         return rc;
 908 }
 909
 910 /* needs down_read on kgn_net_rw_sem held from before this call until
 911  * after the write_lock on kgn_peer_conn_lock - this ensures we stay sane
 912  * with kgnilnd_shutdown - it'll get the sem and set shutdown, then get the
 913  * kgn_peer_conn_lock to start del_peer'ing. If we hold the sem until after
 914  * kgn_peer_conn_lock is held, we guarantee that nobody calls
 915  * kgnilnd_add_peer_locked without checking gnn_shutdown */
 916 int
 917 kgnilnd_create_peer_safe(kgn_peer_t **peerp,
 918                          lnet_nid_t nid,
 919                          kgn_net_t *net,
 920                          int node_state)
 921 {
 922         kgn_peer_t      *peer;
 923         int             rc;
 924
 925         LASSERT(nid != LNET_NID_ANY);
 926
 927         /* We dont pass the net around in the dgram anymore so here is where we find it
 928          * this will work unless its in shutdown or the nid has a net that is invalid.
 929          * Either way error code needs to be returned in that case.
 930          *
 931          * If the net passed in is not NULL then we can use it, this alleviates looking it
 932          * when the calling function has access to the data.
 933          */
 934         if (net == NULL) {
 935                 rc = kgnilnd_find_net(nid, &net);
 936                 if (rc < 0)
 937                         return rc;
 938         } else {
 939                 /* find net adds a reference on the net if we are not using
 940                  * it we must do it manually so the net references are
 941                  * correct when tearing down the net
 942                  */
 943                 kgnilnd_net_addref(net);
 944         }
 945
 946         LIBCFS_ALLOC(peer, sizeof(*peer));
 947         if (peer == NULL) {
 948                 kgnilnd_net_decref(net);
 949                 return -ENOMEM;
 950         }
 951         peer->gnp_nid = nid;
 952         peer->gnp_down = node_state;
 953
 954         /* translate from nid to nic addr & store */
 955         rc = kgnilnd_nid_to_nicaddrs(LNET_NIDADDR(nid), 1, &peer->gnp_host_id);
 956         if (rc <= 0) {
 957                 kgnilnd_net_decref(net);
 958                 LIBCFS_FREE(peer, sizeof(*peer));
 959                 return -ESRCH;
 960         }
 961         CDEBUG(D_NET, "peer 0x%p->%s -> NIC 0x%x\n", peer,
 962                 libcfs_nid2str(nid), peer->gnp_host_id);
 963
 964         atomic_set(&peer->gnp_refcount, 1);     /* 1 ref for caller */
 965         atomic_set(&peer->gnp_dirty_eps, 0);
 966
 967         INIT_LIST_HEAD(&peer->gnp_list);
 968         INIT_LIST_HEAD(&peer->gnp_connd_list);
 969         INIT_LIST_HEAD(&peer->gnp_conns);
 970         INIT_LIST_HEAD(&peer->gnp_tx_queue);
 971
 972         /* the first reconnect should happen immediately, so we leave
 973          * gnp_reconnect_interval set to 0 */
 974
 975         LASSERTF(net != NULL, "peer 0x%p->%s with NULL net\n",
 976                  peer, libcfs_nid2str(nid));
 977
 978         /* must have kgn_net_rw_sem held for this...  */
 979         if (net->gnn_shutdown) {
 980                 /* shutdown has started already */
 981                 kgnilnd_net_decref(net);
 982                 LIBCFS_FREE(peer, sizeof(*peer));
 983                 return -ESHUTDOWN;
 984         }
 985
 986         peer->gnp_net = net;
 987
 988         atomic_inc(&kgnilnd_data.kgn_npeers);
 989
 990         *peerp = peer;
 991         return 0;
 992 }
 993
 994 void
 995 kgnilnd_destroy_peer(kgn_peer_t *peer)
 996 {
 997         CDEBUG(D_NET, "peer %s %p deleted\n",
 998                libcfs_nid2str(peer->gnp_nid), peer);
 999         LASSERTF(atomic_read(&peer->gnp_refcount) == 0,
1000                  "peer 0x%p->%s refs %d\n",
1001                  peer, libcfs_nid2str(peer->gnp_nid),
1002                  atomic_read(&peer->gnp_refcount));
1003         LASSERTF(atomic_read(&peer->gnp_dirty_eps) == 0,
1004                  "peer 0x%p->%s dirty eps %d\n",
1005                  peer, libcfs_nid2str(peer->gnp_nid),
1006                  atomic_read(&peer->gnp_dirty_eps));
1007         LASSERTF(peer->gnp_net != NULL, "peer %p (%s) with NULL net\n",
1008                  peer, libcfs_nid2str(peer->gnp_nid));
1009         LASSERTF(!kgnilnd_peer_active(peer),
1010                  "peer 0x%p->%s\n",
1011                 peer, libcfs_nid2str(peer->gnp_nid));
1012         LASSERTF(peer->gnp_connecting == GNILND_PEER_IDLE || peer->gnp_connecting == GNILND_PEER_KILL,
1013                  "peer 0x%p->%s, connecting %d\n",
1014                 peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting);
1015         LASSERTF(list_empty(&peer->gnp_conns),
1016                  "peer 0x%p->%s\n",
1017                 peer, libcfs_nid2str(peer->gnp_nid));
1018         LASSERTF(list_empty(&peer->gnp_tx_queue),
1019                  "peer 0x%p->%s\n",
1020                 peer, libcfs_nid2str(peer->gnp_nid));
1021         LASSERTF(list_empty(&peer->gnp_connd_list),
1022                  "peer 0x%p->%s\n",
1023                 peer, libcfs_nid2str(peer->gnp_nid));
1024
1025         /* NB a peer's connections keep a reference on their peer until
1026          * they are destroyed, so we can be assured that _all_ state to do
1027          * with this peer has been cleaned up when its refcount drops to
1028          * zero. */
1029
1030         atomic_dec(&kgnilnd_data.kgn_npeers);
1031         kgnilnd_net_decref(peer->gnp_net);
1032
1033         LIBCFS_FREE(peer, sizeof(*peer));
1034 }
1035
1036 /* the conn might not have made it all the way through to a connected
1037  * state - but we need to purgatory any conn that a remote peer might
1038  * have seen through a posted dgram as well */
1039 void
1040 kgnilnd_add_purgatory_locked(kgn_conn_t *conn, kgn_peer_t *peer)
1041 {
1042         kgn_mbox_info_t *mbox = NULL;
1043         ENTRY;
1044
1045         /* NB - the caller should own conn by removing him from the
1046          * scheduler thread when finishing the close */
1047
1048         LASSERTF(peer != NULL, "conn %p with NULL peer\n", conn);
1049
1050         /* If this is still true, need to add the calls to unlink back in and
1051          * figure out how to close the hole on loopback conns */
1052         LASSERTF(kgnilnd_peer_active(peer), "can't use inactive peer %s (%p)"
1053                 " we'll never recover the resources\n",
1054                 libcfs_nid2str(peer->gnp_nid), peer);
1055
1056         CDEBUG(D_NET, "conn %p peer %p dev %p\n", conn, peer,
1057                 conn->gnc_device);
1058
1059         LASSERTF(conn->gnc_in_purgatory == 0,
1060                 "Conn already in purgatory\n");
1061         conn->gnc_in_purgatory = 1;
1062
1063         mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
1064         mbox->mbx_prev_purg_nid = peer->gnp_nid;
1065         mbox->mbx_add_purgatory = jiffies;
1066         kgnilnd_release_mbox(conn, 1);
1067
1068         LASSERTF(list_empty(&conn->gnc_mdd_list),
1069                 "conn 0x%p->%s with active purgatory hold MDD %d\n",
1070                 conn, libcfs_nid2str(peer->gnp_nid),
1071                 kgnilnd_count_list(&conn->gnc_mdd_list));
1072
1073         EXIT;
1074 }
1075
1076 /* Instead of detaching everything from purgatory here we just mark the conn as needing
1077  * detach, when the reaper checks the conn the next time it will detach it.
1078  * Calling function requires write_lock held on kgn_peer_conn_lock
1079  */
1080 void
1081 kgnilnd_mark_for_detach_purgatory_all_locked(kgn_peer_t *peer) {
1082         kgn_conn_t       *conn;
1083
1084         list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
1085                 if (conn->gnc_in_purgatory && !conn->gnc_needs_detach) {
1086                         conn->gnc_needs_detach = 1;
1087                         kgnilnd_admin_addref(kgnilnd_data.kgn_npending_detach);
1088                 }
1089         }
1090 }
1091
1092 /* Calling function needs a write_lock held on kgn_peer_conn_lock */
1093 void
1094 kgnilnd_detach_purgatory_locked(kgn_conn_t *conn, struct list_head *conn_list)
1095 {
1096         kgn_mbox_info_t *mbox = NULL;
1097
1098         /* if needed, add the conn purgatory data to the list passed in */
1099         if (conn->gnc_in_purgatory) {
1100                 CDEBUG(D_NET, "peer %p->%s purg_conn %p@%s mdd_list #tx %d\n",
1101                         conn->gnc_peer, libcfs_nid2str(conn->gnc_peer->gnp_nid),
1102                         conn, kgnilnd_conn_state2str(conn),
1103                         kgnilnd_count_list(&conn->gnc_mdd_list));
1104
1105                 mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
1106                 mbox->mbx_detach_of_purgatory = jiffies;
1107
1108                 /* conn->gnc_list is the entry point on peer->gnp_conns, so detaching it
1109                  * here removes it from the list of 'valid' peer connections.
1110                  * We put the current conn onto a list of conns to call kgnilnd_release_purgatory_locked()
1111                  * and as such the caller of kgnilnd_detach_purgatory_locked() now owns that conn, since its not
1112                  * on the peer's conn_list anymore.
1113                  */
1114
1115                 list_del_init(&conn->gnc_list);
1116
1117                 /* NB - only unlinking if we set pending in del_peer_locked from admin or
1118                  * shutdown */
1119                 if (kgnilnd_peer_active(conn->gnc_peer) &&
1120                     conn->gnc_peer->gnp_pending_unlink &&
1121                     kgnilnd_can_unlink_peer_locked(conn->gnc_peer)) {
1122                         kgnilnd_unlink_peer_locked(conn->gnc_peer);
1123                 }
1124                 /* The reaper will not call detach unless the conn is fully through kgnilnd_complete_closed_conn.
1125                  * If the conn is not in a DONE state somehow we are attempting to detach even though
1126                  * the conn has not been fully cleaned up. If we detach while the conn is still closing
1127                  * we will end up with an orphaned connection that has valid ep_handle, that is not on a
1128                  * peer.
1129                  */
1130
1131                 LASSERTF(conn->gnc_state == GNILND_CONN_DONE, "Conn in invalid state  %p@%s \n",
1132                                 conn, kgnilnd_conn_state2str(conn));
1133
1134                 /* move from peer to the delayed release list */
1135                 list_add_tail(&conn->gnc_list, conn_list);
1136         }
1137 }
1138
1139 void
1140 kgnilnd_release_purgatory_list(struct list_head *conn_list)
1141 {
1142         kgn_device_t            *dev;
1143         kgn_conn_t              *conn, *connN;
1144         kgn_mdd_purgatory_t     *gmp, *gmpN;
1145
1146         list_for_each_entry_safe(conn, connN, conn_list, gnc_list) {
1147                 dev = conn->gnc_device;
1148
1149                 kgnilnd_release_mbox(conn, -1);
1150                 conn->gnc_in_purgatory = 0;
1151
1152                 list_del_init(&conn->gnc_list);
1153
1154                 /* gnc_needs_detach is set in kgnilnd_del_conn_or_peer. It is used to keep track
1155                  * of conns that have been marked for detach by kgnilnd_del_conn_or_peer.
1156                  * The function uses kgn_npending_detach to verify the conn has
1157                  * actually been detached.
1158                  */
1159
1160                 if (conn->gnc_needs_detach)
1161                         kgnilnd_admin_decref(kgnilnd_data.kgn_npending_detach);
1162
1163                 /* if this guy is really dead (we are doing release from reaper),
1164                  * make sure we tell LNet - if this is from other context,
1165                  * the checks in the function will prevent an errant
1166                  * notification */
1167                 kgnilnd_peer_notify(conn->gnc_peer, conn->gnc_error);
1168
1169                 list_for_each_entry_safe(gmp, gmpN, &conn->gnc_mdd_list,
1170                                          gmp_list) {
1171                         CDEBUG(D_NET,
1172                                "dev %p releasing held mdd "LPX64"."LPX64"\n",
1173                                conn->gnc_device, gmp->gmp_map_key.qword1,
1174                                gmp->gmp_map_key.qword2);
1175
1176                         atomic_dec(&dev->gnd_n_mdd_held);
1177                         kgnilnd_mem_mdd_release(conn->gnc_device->gnd_handle,
1178                                                 &gmp->gmp_map_key);
1179                         /* ignoring the return code - if kgni/ghal can't find it
1180                          * it must be released already */
1181
1182                         list_del_init(&gmp->gmp_list);
1183                         LIBCFS_FREE(gmp, sizeof(*gmp));
1184                 }
1185                 /* lose conn ref for purgatory */
1186                 kgnilnd_conn_decref(conn);
1187         }
1188 }
1189
1190 /* needs write_lock on kgnilnd_data.kgn_peer_conn_lock held */
1191 void
1192 kgnilnd_peer_increase_reconnect_locked(kgn_peer_t *peer)
1193 {
1194         int current_to;
1195
1196         current_to = peer->gnp_reconnect_interval;
1197
1198         /* we'll try to reconnect fast the first time, then back-off */
1199         if (current_to == 0) {
1200                 peer->gnp_reconnect_time = jiffies - 1;
1201                 current_to = *kgnilnd_tunables.kgn_min_reconnect_interval;
1202         } else {
1203                 peer->gnp_reconnect_time = jiffies + cfs_time_seconds(current_to);
1204                 /* add 50% of min timeout & retry */
1205                 current_to += *kgnilnd_tunables.kgn_min_reconnect_interval / 2;
1206         }
1207
1208         current_to = MIN(current_to,
1209                                 *kgnilnd_tunables.kgn_max_reconnect_interval);
1210
1211         peer->gnp_reconnect_interval = current_to;
1212         CDEBUG(D_NET, "peer %s can reconnect at %lu interval %lu\n",
1213                libcfs_nid2str(peer->gnp_nid), peer->gnp_reconnect_time,
1214                peer->gnp_reconnect_interval);
1215 }
1216
1217 /* needs kgnilnd_data.kgn_peer_conn_lock held */
1218 kgn_peer_t *
1219 kgnilnd_find_peer_locked(lnet_nid_t nid)
1220 {
1221         struct list_head *peer_list = kgnilnd_nid2peerlist(nid);
1222         kgn_peer_t       *peer;
1223
1224         /* Chopping nid down to only NIDADDR using LNET_NIDADDR so we only
1225          * have a single peer per device instead of a peer per nid/net combo.
1226          */
1227
1228         list_for_each_entry(peer, peer_list, gnp_list) {
1229                 if (LNET_NIDADDR(nid) != LNET_NIDADDR(peer->gnp_nid))
1230                         continue;
1231
1232                 CDEBUG(D_NET, "got peer [%p] -> %s c %d (%d)\n",
1233                        peer, libcfs_nid2str(nid),
1234                        peer->gnp_connecting,
1235                        atomic_read(&peer->gnp_refcount));
1236                 return peer;
1237         }
1238         return NULL;
1239 }
1240
1241 /* need write_lock on kgn_peer_conn_lock */
1242 void
1243 kgnilnd_unlink_peer_locked(kgn_peer_t *peer)
1244 {
1245         LASSERTF(list_empty(&peer->gnp_conns),
1246                 "peer 0x%p->%s\n",
1247                  peer, libcfs_nid2str(peer->gnp_nid));
1248         LASSERTF(list_empty(&peer->gnp_tx_queue),
1249                 "peer 0x%p->%s\n",
1250                  peer, libcfs_nid2str(peer->gnp_nid));
1251         LASSERTF(kgnilnd_peer_active(peer),
1252                 "peer 0x%p->%s\n",
1253                  peer, libcfs_nid2str(peer->gnp_nid));
1254         CDEBUG(D_NET, "unlinking peer 0x%p->%s\n",
1255                 peer, libcfs_nid2str(peer->gnp_nid));
1256
1257         list_del_init(&peer->gnp_list);
1258         kgnilnd_data.kgn_peer_version++;
1259         kgnilnd_admin_decref(kgnilnd_data.kgn_npending_unlink);
1260         /* lose peerlist's ref */
1261         kgnilnd_peer_decref(peer);
1262 }
1263
1264 int
1265 kgnilnd_get_peer_info(int index,
1266                       kgn_peer_t **found_peer,
1267                       lnet_nid_t *id, __u32 *nic_addr,
1268                       int *refcount, int *connecting)
1269 {
1270         struct list_head  *ptmp;
1271         kgn_peer_t        *peer;
1272         int               i;
1273         int               rc = -ENOENT;
1274
1275         read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1276
1277         for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
1278
1279                 list_for_each(ptmp, &kgnilnd_data.kgn_peers[i]) {
1280                         peer = list_entry(ptmp, kgn_peer_t, gnp_list);
1281
1282                         if (index-- > 0)
1283                                 continue;
1284
1285                         CDEBUG(D_NET, "found peer %p (%s) at index %d\n",
1286                                peer, libcfs_nid2str(peer->gnp_nid), index);
1287
1288                         *found_peer  = peer;
1289                         *id          = peer->gnp_nid;
1290                         *nic_addr    = peer->gnp_host_id;
1291                         *refcount    = atomic_read(&peer->gnp_refcount);
1292                         *connecting  = peer->gnp_connecting;
1293
1294                         rc = 0;
1295                         goto out;
1296                 }
1297         }
1298 out:
1299         read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1300         if (rc)
1301                 CDEBUG(D_NET, "no gni peer at index %d\n", index);
1302         return rc;
1303 }
1304
1305 /* requires write_lock on kgn_peer_conn_lock held */
1306 void
1307 kgnilnd_add_peer_locked(lnet_nid_t nid, kgn_peer_t *new_stub_peer, kgn_peer_t **peerp)
1308 {
1309         kgn_peer_t        *peer, *peer2;
1310
1311         LASSERTF(new_stub_peer != NULL, "bad stub peer for nid %s\n",
1312                  libcfs_nid2str(nid));
1313
1314         peer2 = kgnilnd_find_peer_locked(nid);
1315         if (peer2 != NULL) {
1316                 /* A peer was created during the lock transition, so drop
1317                  * the new one we created */
1318                 kgnilnd_peer_decref(new_stub_peer);
1319                 peer = peer2;
1320         } else {
1321                 peer = new_stub_peer;
1322                 /* peer table takes existing ref on peer */
1323
1324                 LASSERTF(!kgnilnd_peer_active(peer),
1325                         "peer 0x%p->%s already in peer table\n",
1326                         peer, libcfs_nid2str(peer->gnp_nid));
1327                 list_add_tail(&peer->gnp_list,
1328                               kgnilnd_nid2peerlist(nid));
1329                 kgnilnd_data.kgn_peer_version++;
1330         }
1331
1332         LASSERTF(peer->gnp_net != NULL, "peer 0x%p->%s with NULL net\n",
1333                  peer, libcfs_nid2str(peer->gnp_nid));
1334         *peerp = peer;
1335 }
1336
1337 int
1338 kgnilnd_add_peer(kgn_net_t *net, lnet_nid_t nid, kgn_peer_t **peerp)
1339 {
1340         kgn_peer_t        *peer;
1341         int                rc;
1342         int                node_state;
1343         ENTRY;
1344
1345         if (nid == LNET_NID_ANY)
1346                 return -EINVAL;
1347
1348         node_state = kgnilnd_get_node_state(LNET_NIDADDR(nid));
1349
1350         /* NB - this will not block during normal operations -
1351          * the only writer of this is in the startup/shutdown path. */
1352         rc = down_read_trylock(&kgnilnd_data.kgn_net_rw_sem);
1353         if (!rc) {
1354                 rc = -ESHUTDOWN;
1355                 RETURN(rc);
1356         }
1357         rc = kgnilnd_create_peer_safe(&peer, nid, net, node_state);
1358         if (rc != 0) {
1359                 up_read(&kgnilnd_data.kgn_net_rw_sem);
1360                 RETURN(rc);
1361         }
1362
1363         write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1364         up_read(&kgnilnd_data.kgn_net_rw_sem);
1365
1366         kgnilnd_add_peer_locked(nid, peer, peerp);
1367
1368         CDEBUG(D_NET, "peer 0x%p->%s connecting %d\n",
1369                peerp, libcfs_nid2str((*peerp)->gnp_nid),
1370                (*peerp)->gnp_connecting);
1371
1372         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1373         RETURN(0);
1374 }
1375
1376 /* needs write_lock on kgn_peer_conn_lock */
1377 void
1378 kgnilnd_cancel_peer_connect_locked(kgn_peer_t *peer, struct list_head *zombies)
1379 {
1380         kgn_tx_t        *tx, *txn;
1381
1382         /* we do care about state of gnp_connecting - we could be between
1383          * reconnect attempts, so try to find the dgram and cancel the TX
1384          * anyways. If we are in the process of posting DONT do anything;
1385          * once it fails or succeeds we can nuke the connect attempt.
1386          * We have no idea where in kgnilnd_post_dgram we are so we cant
1387          * attempt to cancel until the function is done.
1388          */
1389
1390         /* make sure peer isn't in process of connecting or waiting for connect*/
1391         spin_lock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
1392         if (!(list_empty(&peer->gnp_connd_list))) {
1393                 list_del_init(&peer->gnp_connd_list);
1394                 /* remove connd ref */
1395                 kgnilnd_peer_decref(peer);
1396         }
1397         spin_unlock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
1398
1399         if (peer->gnp_connecting == GNILND_PEER_POSTING || peer->gnp_connecting == GNILND_PEER_NEEDS_DEATH) {
1400                 peer->gnp_connecting = GNILND_PEER_NEEDS_DEATH;
1401                 /* We are in process of posting right now the xchg set it up for us to
1402                  * cancel the connect so we are finished for now */
1403         } else {
1404                 /* no need for exchange we have the peer lock and its ready for us to nuke */
1405                 LASSERTF(peer->gnp_connecting != GNILND_PEER_POSTING,
1406                         "Peer in invalid state 0x%p->%s, connecting %d\n",
1407                         peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting);
1408                 peer->gnp_connecting = GNILND_PEER_IDLE;
1409                 set_mb(peer->gnp_last_dgram_errno, -ETIMEDOUT);
1410                 kgnilnd_find_and_cancel_dgram(peer->gnp_net->gnn_dev,
1411                                                       peer->gnp_nid);
1412         }
1413
1414         /* The least we can do is nuke the tx's no matter what.... */
1415         list_for_each_entry_safe(tx, txn, &peer->gnp_tx_queue, tx_list) {
1416                 kgnilnd_tx_del_state_locked(tx, peer, NULL,
1417                                            GNILND_TX_ALLOCD);
1418                 list_add_tail(&tx->tx_list, zombies);
1419         }
1420 }
1421
1422 /* needs write_lock on kgn_peer_conn_lock */
1423 void
1424 kgnilnd_del_peer_locked(kgn_peer_t *peer, int error)
1425 {
1426         /* this peer could be passive and only held for purgatory,
1427          * take a ref to ensure it doesn't disappear in this function */
1428         kgnilnd_peer_addref(peer);
1429
1430         CFS_RACE(CFS_FAIL_GNI_FIND_TARGET);
1431
1432         /* if purgatory release cleared it out, don't try again */
1433         if (kgnilnd_peer_active(peer)) {
1434                 /* always do this to allow kgnilnd_start_connect and
1435                  * kgnilnd_finish_connect to catch this before they
1436                  * wrap up their operations */
1437                 if (kgnilnd_can_unlink_peer_locked(peer)) {
1438                         /* already released purgatory, so only active
1439                          * conns hold it */
1440                         kgnilnd_unlink_peer_locked(peer);
1441                 } else {
1442                         kgnilnd_close_peer_conns_locked(peer, error);
1443                         /* peer unlinks itself when last conn is closed */
1444                 }
1445         }
1446
1447         /* we are done, release back to the wild */
1448         kgnilnd_peer_decref(peer);
1449 }
1450
1451 int
1452 kgnilnd_del_conn_or_peer(kgn_net_t *net, lnet_nid_t nid, int command,
1453                           int error)
1454 {
1455         LIST_HEAD               (souls);
1456         LIST_HEAD               (zombies);
1457         struct list_head        *ptmp, *pnxt;
1458         kgn_peer_t              *peer;
1459         int                     lo;
1460         int                     hi;
1461         int                     i;
1462         int                     rc = -ENOENT;
1463
1464         write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1465
1466         if (nid != LNET_NID_ANY)
1467                 lo = hi = kgnilnd_nid2peerlist(nid) - kgnilnd_data.kgn_peers;
1468         else {
1469                 lo = 0;
1470                 hi = *kgnilnd_tunables.kgn_peer_hash_size - 1;
1471                 /* wildcards always succeed */
1472                 rc = 0;
1473         }
1474
1475         for (i = lo; i <= hi; i++) {
1476                 list_for_each_safe(ptmp, pnxt, &kgnilnd_data.kgn_peers[i]) {
1477                         peer = list_entry(ptmp, kgn_peer_t, gnp_list);
1478
1479                         LASSERTF(peer->gnp_net != NULL,
1480                                 "peer %p (%s) with NULL net\n",
1481                                  peer, libcfs_nid2str(peer->gnp_nid));
1482
1483                         if (net != NULL && peer->gnp_net != net)
1484                                 continue;
1485
1486                         if (!(nid == LNET_NID_ANY || LNET_NIDADDR(peer->gnp_nid) == LNET_NIDADDR(nid)))
1487                                 continue;
1488
1489                         /* In both cases, we want to stop any in-flight
1490                          * connect attempts */
1491                         kgnilnd_cancel_peer_connect_locked(peer, &zombies);
1492
1493                         switch (command) {
1494                         case GNILND_DEL_CONN:
1495                                 kgnilnd_close_peer_conns_locked(peer, error);
1496                                 break;
1497                         case GNILND_DEL_PEER:
1498                                 peer->gnp_pending_unlink = 1;
1499                                 kgnilnd_admin_addref(kgnilnd_data.kgn_npending_unlink);
1500                                 kgnilnd_mark_for_detach_purgatory_all_locked(peer);
1501                                 kgnilnd_del_peer_locked(peer, error);
1502                                 break;
1503                         case GNILND_CLEAR_PURGATORY:
1504                                 /* Mark everything ready for detach reaper will cleanup
1505                                  * once we release the kgn_peer_conn_lock
1506                                  */
1507                                 kgnilnd_mark_for_detach_purgatory_all_locked(peer);
1508                                 peer->gnp_last_errno = -EISCONN;
1509                                 /* clear reconnect so he can reconnect soon */
1510                                 peer->gnp_reconnect_time = 0;
1511                                 peer->gnp_reconnect_interval = 0;
1512                                 break;
1513                         default:
1514                                 CERROR("bad command %d\n", command);
1515                                 LBUG();
1516                         }
1517                         /* we matched something */
1518                         rc = 0;
1519                 }
1520         }
1521
1522         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1523
1524         /* nuke peer TX */
1525         kgnilnd_txlist_done(&zombies, error);
1526
1527         /* This function does not return until the commands it initiated have completed,
1528          * since they have to work there way through the other threads. In the case of shutdown
1529          * threads are not woken up until after this call is initiated so we cannot wait, we just
1530          * need to return. The same applies for stack reset we shouldnt wait as the reset thread
1531          * handles closing.
1532          */
1533
1534         CFS_RACE(CFS_FAIL_GNI_RACE_RESET);
1535
1536         if (error == -ENOTRECOVERABLE || error == -ESHUTDOWN) {
1537                 return rc;
1538         }
1539
1540         i = 4;
1541         while (atomic_read(&kgnilnd_data.kgn_npending_conns)   ||
1542                atomic_read(&kgnilnd_data.kgn_npending_detach)  ||
1543                atomic_read(&kgnilnd_data.kgn_npending_unlink)) {
1544
1545                 cfs_pause(cfs_time_seconds(1));
1546                 i++;
1547
1548                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, "Waiting on %d peers %d closes %d detaches\n",
1549                                 atomic_read(&kgnilnd_data.kgn_npending_unlink),
1550                                 atomic_read(&kgnilnd_data.kgn_npending_conns),
1551                                 atomic_read(&kgnilnd_data.kgn_npending_detach));
1552         }
1553
1554         return rc;
1555 }
1556
1557 kgn_conn_t *
1558 kgnilnd_get_conn_by_idx(int index)
1559 {
1560         kgn_peer_t        *peer;
1561         struct list_head  *ptmp;
1562         kgn_conn_t        *conn;
1563         struct list_head  *ctmp;
1564         int                i;
1565
1566
1567         for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
1568                 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1569                 list_for_each(ptmp, &kgnilnd_data.kgn_peers[i]) {
1570
1571                         peer = list_entry(ptmp, kgn_peer_t, gnp_list);
1572
1573                         list_for_each(ctmp, &peer->gnp_conns) {
1574                                 conn = list_entry(ctmp, kgn_conn_t, gnc_list);
1575
1576                                 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
1577                                         continue;
1578
1579                                 if (index-- > 0)
1580                                         continue;
1581
1582                                 CDEBUG(D_NET, "++conn[%p] -> %s (%d)\n", conn,
1583                                        libcfs_nid2str(conn->gnc_peer->gnp_nid),
1584                                        atomic_read(&conn->gnc_refcount));
1585                                 kgnilnd_conn_addref(conn);
1586                                 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1587                                 return conn;
1588                         }
1589                 }
1590                 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1591         }
1592
1593         return NULL;
1594 }
1595
1596 int
1597 kgnilnd_get_conn_info(kgn_peer_t *peer,
1598                       int *device_id, __u64 *peerstamp,
1599                       int *tx_seq, int *rx_seq,
1600                       int *fmaq_len, int *nfma, int *nrdma)
1601 {
1602         kgn_conn_t        *conn;
1603         int               rc = 0;
1604
1605         read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1606
1607         conn = kgnilnd_find_conn_locked(peer);
1608         if (conn == NULL) {
1609                 rc = -ENOENT;
1610                 goto out;
1611         }
1612
1613         *device_id = conn->gnc_device->gnd_host_id;
1614         *peerstamp = conn->gnc_peerstamp;
1615         *tx_seq = conn->gnc_tx_seq;
1616         *rx_seq = conn->gnc_rx_seq;
1617         *fmaq_len = kgnilnd_count_list(&conn->gnc_fmaq);
1618         *nfma = atomic_read(&conn->gnc_nlive_fma);
1619         *nrdma = atomic_read(&conn->gnc_nlive_rdma);
1620 out:
1621         read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1622         return rc;
1623 }
1624
1625 /* needs write_lock on kgn_peer_conn_lock */
1626 int
1627 kgnilnd_close_peer_conns_locked(kgn_peer_t *peer, int why)
1628 {
1629         kgn_conn_t         *conn;
1630         struct list_head   *ctmp, *cnxt;
1631         int                 count = 0;
1632
1633         list_for_each_safe(ctmp, cnxt, &peer->gnp_conns) {
1634                 conn = list_entry(ctmp, kgn_conn_t, gnc_list);
1635
1636                 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
1637                         continue;
1638
1639                 count++;
1640                 /* we mark gnc_needs closing and increment kgn_npending_conns so that
1641                  * kgnilnd_del_conn_or_peer can wait on the other threads closing
1642                  * and cleaning up the connection.
1643                  */
1644                 if (!conn->gnc_needs_closing) {
1645                         conn->gnc_needs_closing = 1;
1646                         kgnilnd_admin_addref(kgnilnd_data.kgn_npending_conns);
1647                 }
1648                 kgnilnd_close_conn_locked(conn, why);
1649         }
1650         return count;
1651 }
1652
1653 int
1654 kgnilnd_report_node_state(lnet_nid_t nid, int down)
1655 {
1656         int         rc;
1657         kgn_peer_t  *peer, *new_peer;
1658         LIST_HEAD(zombies);
1659
1660         write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1661         peer = kgnilnd_find_peer_locked(nid);
1662
1663         if (peer == NULL) {
1664                 int       i;
1665                 int       found_net = 0;
1666                 kgn_net_t *net;
1667
1668                 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1669
1670                 /* Don't add a peer for node up events */
1671                 if (down == GNILND_RCA_NODE_UP) {
1672                         return 0;
1673                 }
1674
1675                 /* find any valid net - we don't care which one... */
1676                 down_read(&kgnilnd_data.kgn_net_rw_sem);
1677                 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
1678                         list_for_each_entry(net, &kgnilnd_data.kgn_nets[i],
1679                                             gnn_list) {
1680                                 found_net = 1;
1681                                 break;
1682                         }
1683
1684                         if (found_net) {
1685                                 break;
1686                         }
1687                 }
1688                 up_read(&kgnilnd_data.kgn_net_rw_sem);
1689
1690                 if (!found_net) {
1691                         CNETERR("Could not find a net for nid %lld\n", nid);
1692                         return 1;
1693                 }
1694
1695                 /* The nid passed in does not yet contain the net portion.
1696                  * Let's build it up now
1697                  */
1698                 nid = LNET_MKNID(LNET_NIDNET(net->gnn_ni->ni_nid), nid);
1699                 rc = kgnilnd_add_peer(net, nid, &new_peer);
1700
1701                 if (rc) {
1702                         CNETERR("Could not add peer for nid %lld, rc %d\n",
1703                                 nid, rc);
1704                         return 1;
1705                 }
1706
1707                 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1708                 peer = kgnilnd_find_peer_locked(nid);
1709
1710                 if (peer == NULL) {
1711                         CNETERR("Could not find peer for nid %lld\n", nid);
1712                         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1713                         return 1;
1714                 }
1715         }
1716
1717         peer->gnp_down = down;
1718
1719         if (down == GNILND_RCA_NODE_DOWN) {
1720                 kgn_conn_t *conn;
1721
1722                 peer->gnp_down_event_time = jiffies;
1723                 kgnilnd_cancel_peer_connect_locked(peer, &zombies);
1724                 conn = kgnilnd_find_conn_locked(peer);
1725
1726                 if (conn != NULL) {
1727                         kgnilnd_close_conn_locked(conn, -ENETRESET);
1728                 }
1729         } else {
1730                 peer->gnp_up_event_time = jiffies;
1731         }
1732
1733         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1734
1735         if (down == GNILND_RCA_NODE_DOWN) {
1736                 /* using ENETRESET so we don't get messages from
1737                  * kgnilnd_tx_done
1738                  */
1739                 kgnilnd_txlist_done(&zombies, -ENETRESET);
1740
1741                 if (*kgnilnd_tunables.kgn_peer_health) {
1742                         kgnilnd_peer_notify(peer, -ECONNRESET);
1743                 }
1744         }
1745
1746         CDEBUG(D_INFO, "marking nid %lld %s\n", nid, down ? "down" : "up");
1747         return 0;
1748 }
1749
1750 int
1751 kgnilnd_ctl(lnet_ni_t *ni, unsigned int cmd, void *arg)
1752 {
1753         struct libcfs_ioctl_data *data = arg;
1754         kgn_net_t                *net = ni->ni_data;
1755         int                       rc = -EINVAL;
1756
1757         LASSERT(ni == net->gnn_ni);
1758
1759         switch (cmd) {
1760         case IOC_LIBCFS_GET_PEER: {
1761                 lnet_nid_t   nid = 0;
1762                 kgn_peer_t  *peer = NULL;
1763                 __u32 nic_addr = 0;
1764                 __u64 peerstamp = 0;
1765                 int peer_refcount = 0, peer_connecting = 0;
1766                 int device_id = 0;
1767                 int tx_seq = 0, rx_seq = 0;
1768                 int fmaq_len = 0, nfma = 0, nrdma = 0;
1769
1770                 rc = kgnilnd_get_peer_info(data->ioc_count, &peer,
1771                                            &nid, &nic_addr, &peer_refcount,
1772                                            &peer_connecting);
1773                 if (rc)
1774                         break;
1775
1776                 /* Barf */
1777                 /* LNET_MKNID is used to mask from lnet the multiplexing/demultiplexing of connections and peers
1778                  * LNET assumes a conn and peer per net, the LNET_MKNID/LNET_NIDADDR allows us to let Lnet see what it
1779                  * wants to see instead of the underlying network that is being used to send the data
1780                  */
1781                 data->ioc_nid    = LNET_MKNID(LNET_NIDNET(ni->ni_nid), LNET_NIDADDR(nid));
1782                 data->ioc_flags  = peer_connecting;
1783                 data->ioc_count  = peer_refcount;
1784
1785                 rc = kgnilnd_get_conn_info(peer, &device_id, &peerstamp,
1786                                            &tx_seq, &rx_seq, &fmaq_len,
1787                                            &nfma, &nrdma);
1788
1789                 /* This is allowable - a persistent peer could not
1790                  * have a connection */
1791                 if (rc) {
1792                         /* flag to indicate we are not connected -
1793                          * need to print as such */
1794                         data->ioc_flags |= (1<<16);
1795                         rc = 0;
1796                 } else {
1797                         /* still barf */
1798                         data->ioc_net = device_id;
1799                         data->ioc_u64[0] = peerstamp;
1800                         data->ioc_u32[0] = fmaq_len;
1801                         data->ioc_u32[1] = nfma;
1802                         data->ioc_u32[2] = tx_seq;
1803                         data->ioc_u32[3] = rx_seq;
1804                         data->ioc_u32[4] = nrdma;
1805                 }
1806                 break;
1807         }
1808         case IOC_LIBCFS_ADD_PEER: {
1809                 /* just dummy value to allow using common interface */
1810                 kgn_peer_t      *peer;
1811                 rc = kgnilnd_add_peer(net, data->ioc_nid, &peer);
1812                 break;
1813         }
1814         case IOC_LIBCFS_DEL_PEER: {
1815                 /* NULL is passed in so it affects all peers in existence without regard to network
1816                  * as the peer may not exist on the network LNET believes it to be on.
1817                  */
1818                 rc = kgnilnd_del_conn_or_peer(NULL, data->ioc_nid,
1819                                               GNILND_DEL_PEER, -EUCLEAN);
1820                 break;
1821         }
1822         case IOC_LIBCFS_GET_CONN: {
1823                 kgn_conn_t *conn = kgnilnd_get_conn_by_idx(data->ioc_count);
1824
1825                 if (conn == NULL)
1826                         rc = -ENOENT;
1827                 else {
1828                         rc = 0;
1829                         /* LNET_MKNID is used to build the correct address based on what LNET wants to see instead of
1830                          * the generic connection that is used to send the data
1831                          */
1832                         data->ioc_nid    = LNET_MKNID(LNET_NIDNET(ni->ni_nid), LNET_NIDADDR(conn->gnc_peer->gnp_nid));
1833                         data->ioc_u32[0] = conn->gnc_device->gnd_id;
1834                         kgnilnd_conn_decref(conn);
1835                 }
1836                 break;
1837         }
1838         case IOC_LIBCFS_CLOSE_CONNECTION: {
1839                 /* use error = -ENETRESET to indicate it was lctl disconnect */
1840                 /* NULL is passed in so it affects all the nets as the connection is virtual
1841                  * and may not exist on the network LNET believes it to be on.
1842                  */
1843                 rc = kgnilnd_del_conn_or_peer(NULL, data->ioc_nid,
1844                                               GNILND_DEL_CONN, -ENETRESET);
1845                 break;
1846         }
1847         case IOC_LIBCFS_PUSH_CONNECTION: {
1848                 /* we use this to flush purgatory */
1849                 rc = kgnilnd_del_conn_or_peer(NULL, data->ioc_nid,
1850                                               GNILND_CLEAR_PURGATORY, -EUCLEAN);
1851                 break;
1852         }
1853         case IOC_LIBCFS_REGISTER_MYNID: {
1854                 /* Ignore if this is a noop */
1855                 if (data->ioc_nid == ni->ni_nid) {
1856                         rc = 0;
1857                 } else {
1858                         CERROR("obsolete IOC_LIBCFS_REGISTER_MYNID: %s(%s)\n",
1859                                libcfs_nid2str(data->ioc_nid),
1860                                libcfs_nid2str(ni->ni_nid));
1861                         rc = -EINVAL;
1862                 }
1863                 break;
1864         }
1865         }
1866
1867         return rc;
1868 }
1869
1870 void
1871 kgnilnd_query(lnet_ni_t *ni, lnet_nid_t nid, cfs_time_t *when)
1872 {
1873         kgn_net_t               *net = ni->ni_data;
1874         kgn_tx_t                *tx;
1875         kgn_peer_t              *peer = NULL;
1876         kgn_conn_t              *conn = NULL;
1877         lnet_process_id_t       id = {.nid = nid, .pid = LUSTRE_SRV_LNET_PID};
1878         ENTRY;
1879
1880         /* I expect to find him, so only take a read lock */
1881         read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1882         peer = kgnilnd_find_peer_locked(nid);
1883         if (peer != NULL) {
1884                 /* LIE if in a quiesce - we will update the timeouts after,
1885                  * but we don't want sends failing during it */
1886                 if (kgnilnd_data.kgn_quiesce_trigger) {
1887                         *when = jiffies;
1888                         read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1889                         GOTO(out, 0);
1890                 }
1891
1892                 /* Update to best guess, might refine on later checks */
1893                 *when = peer->gnp_last_alive;
1894
1895                 /* we have a peer, how about a conn? */
1896                 conn = kgnilnd_find_conn_locked(peer);
1897
1898                 if (conn == NULL)  {
1899                         /* if there is no conn, check peer last errno to see if clean disconnect
1900                          * - if it was, we lie to LNet because we believe a TX would complete
1901                          * on reconnect */
1902                         if (kgnilnd_conn_clean_errno(peer->gnp_last_errno)) {
1903                                 *when = jiffies;
1904                         }
1905                         /* we still want to fire a TX and new conn in this case */
1906                 } else {
1907                         /* gnp_last_alive is valid, run for the hills */
1908                         read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1909                         GOTO(out, 0);
1910                 }
1911         }
1912         /* if we get here, either we have no peer or no conn for him, so fire off
1913          * new TX to trigger conn setup */
1914         read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1915
1916         /* if we couldn't find him, we'll fire up a TX and get connected -
1917          * if we don't do this, after ni_peer_timeout, LNet will declare him dead.
1918          * So really we treat kgnilnd_query as a bit of a 'connect now' type
1919          * event because it'll only do this when it wants to send
1920          *
1921          * Use a real TX for this to get the proper gnp_tx_queue behavior, etc
1922          * normally we'd use kgnilnd_send_ctlmsg for this, but we don't really
1923          * care that this goes out quickly since we already know we need a new conn
1924          * formed */
1925         if (CFS_FAIL_CHECK(CFS_FAIL_GNI_NOOP_SEND))
1926                 return;
1927
1928         tx = kgnilnd_new_tx_msg(GNILND_MSG_NOOP, ni->ni_nid);
1929         if (tx != NULL) {
1930                 kgnilnd_launch_tx(tx, net, &id);
1931         }
1932 out:
1933         CDEBUG(D_NETTRACE, "peer 0x%p->%s when %lu\n", peer,
1934                libcfs_nid2str(nid), *when);
1935         EXIT;
1936 }
1937
1938 int
1939 kgnilnd_dev_init(kgn_device_t *dev)
1940 {
1941         gni_return_t      rrc;
1942         int               rc = 0;
1943         unsigned int      cq_size;
1944         ENTRY;
1945
1946         /* size of these CQs should be able to accommodate the outgoing
1947          * RDMA and SMSG transactions.  Since we really don't know what we
1948          * really need here, we'll take credits * 2 * 3 to allow a bunch.
1949          * We need to dig into this more with the performance work. */
1950         cq_size = *kgnilnd_tunables.kgn_credits * 2 * 3;
1951
1952         rrc = kgnilnd_cdm_create(dev->gnd_id, *kgnilnd_tunables.kgn_ptag,
1953                                  GNILND_COOKIE, 0,
1954                                  &dev->gnd_domain);
1955         if (rrc != GNI_RC_SUCCESS) {
1956                 CERROR("Can't create CDM %d (%d)\n", dev->gnd_id, rrc);
1957                 GOTO(failed, rc = -ENODEV);
1958         }
1959
1960         rrc = kgnilnd_cdm_attach(dev->gnd_domain, dev->gnd_id,
1961                                  &dev->gnd_host_id, &dev->gnd_handle);
1962         if (rrc != GNI_RC_SUCCESS) {
1963                 CERROR("Can't attach CDM to device %d (%d)\n",
1964                         dev->gnd_id, rrc);
1965                 GOTO(failed, rc = -ENODEV);
1966         }
1967
1968         /* a bit gross, but not much we can do - Aries Sim doesn't have
1969          * hardcoded NIC/NID that we can use */
1970         rc = kgnilnd_setup_nic_translation(dev->gnd_host_id);
1971         if (rc != 0)
1972                 GOTO(failed, rc = -ENODEV);
1973
1974         /* only dev 0 gets the errors - no need to reset the stack twice
1975          * - this works because we have a single PTAG, if we had more
1976          * then we'd need to have multiple handlers */
1977         if (dev->gnd_id == 0) {
1978                 rrc = kgnilnd_subscribe_errors(dev->gnd_handle,
1979                                                 GNI_ERRMASK_CRITICAL |
1980                                                 GNI_ERRMASK_UNKNOWN_TRANSACTION,
1981                                               0, NULL, kgnilnd_critical_error,
1982                                               &dev->gnd_err_handle);
1983                 if (rrc != GNI_RC_SUCCESS) {
1984                         CERROR("Can't subscribe for errors on device %d: rc %d\n",
1985                                 dev->gnd_id, rrc);
1986                         GOTO(failed, rc = -ENODEV);
1987                 }
1988
1989                 rc = kgnilnd_set_quiesce_callback(dev->gnd_handle,
1990                                                   kgnilnd_quiesce_end_callback);
1991                 if (rc != GNI_RC_SUCCESS) {
1992                         CERROR("Can't subscribe for quiesce callback on device %d: rc %d\n",
1993                                 dev->gnd_id, rrc);
1994                         GOTO(failed, rc = -ENODEV);
1995                 }
1996         }
1997
1998         rrc = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_IP, &kgnilnd_data.kgn_sock);
1999         if (rrc < 0) {
2000                 CERROR("sock_create returned %d\n", rrc);
2001                 GOTO(failed, rrc);
2002         }
2003
2004         rc = kgnilnd_nicaddr_to_nid(dev->gnd_host_id, &dev->gnd_nid);
2005         if (rc < 0) {
2006                 /* log messages during startup */
2007                 if (kgnilnd_data.kgn_init < GNILND_INIT_ALL) {
2008                         CERROR("couldn't translate host_id 0x%x to nid. rc %d\n",
2009                                 dev->gnd_host_id, rc);
2010                 }
2011                 GOTO(failed, rc = -ESRCH);
2012         }
2013         CDEBUG(D_NET, "NIC %x -> NID %d\n", dev->gnd_host_id, dev->gnd_nid);
2014
2015         rrc = kgnilnd_cq_create(dev->gnd_handle, cq_size,
2016                                 0, kgnilnd_device_callback,
2017                                 dev->gnd_id, &dev->gnd_snd_rdma_cqh);
2018         if (rrc != GNI_RC_SUCCESS) {
2019                 CERROR("Can't create rdma send cq size %u for device "
2020                        "%d (%d)\n", cq_size, dev->gnd_id, rrc);
2021                 GOTO(failed, rc = -EINVAL);
2022         }
2023
2024         rrc = kgnilnd_cq_create(dev->gnd_handle, cq_size,
2025                         0, kgnilnd_device_callback, dev->gnd_id,
2026                         &dev->gnd_snd_fma_cqh);
2027         if (rrc != GNI_RC_SUCCESS) {
2028                 CERROR("Can't create fma send cq size %u for device %d (%d)\n",
2029                        cq_size, dev->gnd_id, rrc);
2030                 GOTO(failed, rc = -EINVAL);
2031         }
2032
2033         /* This one we size differently - overflows are possible and it needs to be
2034          * sized based on machine size */
2035         rrc = kgnilnd_cq_create(dev->gnd_handle,
2036                         *kgnilnd_tunables.kgn_fma_cq_size,
2037                         0, kgnilnd_device_callback, dev->gnd_id,
2038                         &dev->gnd_rcv_fma_cqh);
2039         if (rrc != GNI_RC_SUCCESS) {
2040                 CERROR("Can't create fma cq size %d for device %d (%d)\n",
2041                        *kgnilnd_tunables.kgn_fma_cq_size, dev->gnd_id, rrc);
2042                 GOTO(failed, rc = -EINVAL);
2043         }
2044
2045         RETURN(0);
2046
2047 failed:
2048         kgnilnd_dev_fini(dev);
2049         RETURN(rc);
2050 }
2051
2052 void
2053 kgnilnd_dev_fini(kgn_device_t *dev)
2054 {
2055         gni_return_t rrc;
2056         ENTRY;
2057
2058         /* At quiesce or rest time, need to loop through and clear gnd_ready_conns ?*/
2059         LASSERTF(list_empty(&dev->gnd_ready_conns) &&
2060                  list_empty(&dev->gnd_map_tx) &&
2061                  list_empty(&dev->gnd_rdmaq),
2062                  "dev 0x%p ready_conns %d@0x%p map_tx %d@0x%p rdmaq %d@0x%p\n",
2063                  dev, kgnilnd_count_list(&dev->gnd_ready_conns), &dev->gnd_ready_conns,
2064                  kgnilnd_count_list(&dev->gnd_map_tx), &dev->gnd_map_tx,
2065                  kgnilnd_count_list(&dev->gnd_rdmaq), &dev->gnd_rdmaq);
2066
2067         /* These should follow from tearing down all connections */
2068         LASSERTF(dev->gnd_map_nphys == 0 && dev->gnd_map_physnop == 0,
2069                 "%d physical mappings of %d pages still mapped\n",
2070                  dev->gnd_map_nphys, dev->gnd_map_physnop);
2071
2072         LASSERTF(dev->gnd_map_nvirt == 0 && dev->gnd_map_virtnob == 0,
2073                 "%d virtual mappings of "LPU64" bytes still mapped\n",
2074                  dev->gnd_map_nvirt, dev->gnd_map_virtnob);
2075
2076         LASSERTF(atomic_read(&dev->gnd_n_mdd) == 0 &&
2077                  atomic_read(&dev->gnd_n_mdd_held) == 0 &&
2078                  atomic64_read(&dev->gnd_nbytes_map) == 0,
2079                 "%d SMSG mappings of %ld bytes still mapped or held %d\n",
2080                  atomic_read(&dev->gnd_n_mdd),
2081                  atomic64_read(&dev->gnd_nbytes_map), atomic_read(&dev->gnd_n_mdd_held));
2082
2083         LASSERT(list_empty(&dev->gnd_map_list));
2084
2085         /* What other assertions needed to ensure all connections torn down ? */
2086
2087         /* check all counters == 0 (EP, MDD, etc) */
2088
2089         /* if we are resetting due to quiese (stack reset), don't check
2090          * thread states */
2091         LASSERTF(kgnilnd_data.kgn_quiesce_trigger ||
2092                 atomic_read(&kgnilnd_data.kgn_nthreads) == 0,
2093                 "tried to shutdown with threads active\n");
2094
2095         if (dev->gnd_rcv_fma_cqh) {
2096                 rrc = kgnilnd_cq_destroy(dev->gnd_rcv_fma_cqh);
2097                 LASSERTF(rrc == GNI_RC_SUCCESS,
2098                         "bad rc from gni_cq_destroy on rcv_fma_cqh: %d\n", rrc);
2099                 dev->gnd_rcv_fma_cqh = NULL;
2100         }
2101
2102         if (dev->gnd_snd_rdma_cqh) {
2103                 rrc = kgnilnd_cq_destroy(dev->gnd_snd_rdma_cqh);
2104                 LASSERTF(rrc == GNI_RC_SUCCESS,
2105                         "bad rc from gni_cq_destroy on send_rdma_cqh: %d\n", rrc);
2106                 dev->gnd_snd_rdma_cqh = NULL;
2107         }
2108
2109         if (dev->gnd_snd_fma_cqh) {
2110                 rrc = kgnilnd_cq_destroy(dev->gnd_snd_fma_cqh);
2111                 LASSERTF(rrc == GNI_RC_SUCCESS,
2112                         "bad rc from gni_cq_destroy on snd_fma_cqh: %d\n", rrc);
2113                 dev->gnd_snd_fma_cqh = NULL;
2114         }
2115
2116         if (dev->gnd_err_handle) {
2117                 rrc = kgnilnd_release_errors(dev->gnd_err_handle);
2118                 LASSERTF(rrc == GNI_RC_SUCCESS,
2119                         "bad rc from gni_release_errors: %d\n", rrc);
2120                 dev->gnd_err_handle = NULL;
2121         }
2122
2123         if (dev->gnd_domain) {
2124                 rrc = kgnilnd_cdm_destroy(dev->gnd_domain);
2125                 LASSERTF(rrc == GNI_RC_SUCCESS,
2126                         "bad rc from gni_cdm_destroy: %d\n", rrc);
2127                 dev->gnd_domain = NULL;
2128         }
2129
2130         sock_release(kgnilnd_data.kgn_sock);
2131
2132         EXIT;
2133 }
2134
2135
2136 int kgnilnd_base_startup(void)
2137 {
2138         struct timeval       tv;
2139         int                  pkmem = atomic_read(&libcfs_kmemory);
2140         int                  rc;
2141         int                  i;
2142         kgn_device_t        *dev;
2143         struct task_struct  *thrd;
2144         ENTRY;
2145
2146         LASSERTF(kgnilnd_data.kgn_init == GNILND_INIT_NOTHING,
2147                 "init %d\n", kgnilnd_data.kgn_init);
2148
2149         /* zero pointers, flags etc */
2150         memset(&kgnilnd_data, 0, sizeof(kgnilnd_data));
2151
2152         /* CAVEAT EMPTOR: Every 'Fma' message includes the sender's NID and
2153          * a unique (for all time) connstamp so we can uniquely identify
2154          * the sender.  The connstamp is an incrementing counter
2155          * initialised with seconds + microseconds at startup time.  So we
2156          * rely on NOT creating connections more frequently on average than
2157          * 1MHz to ensure we don't use old connstamps when we reboot. */
2158         do_gettimeofday(&tv);
2159         kgnilnd_data.kgn_connstamp =
2160                  kgnilnd_data.kgn_peerstamp =
2161                         (((__u64)tv.tv_sec) * 1000000) + tv.tv_usec;
2162
2163         init_rwsem(&kgnilnd_data.kgn_net_rw_sem);
2164
2165         for (i = 0; i < GNILND_MAXDEVS; i++) {
2166                 kgn_device_t  *dev = &kgnilnd_data.kgn_devices[i];
2167
2168                 dev->gnd_id = i;
2169                 INIT_LIST_HEAD(&dev->gnd_ready_conns);
2170                 INIT_LIST_HEAD(&dev->gnd_map_tx);
2171                 INIT_LIST_HEAD(&dev->gnd_fma_buffs);
2172                 mutex_init(&dev->gnd_cq_mutex);
2173                 mutex_init(&dev->gnd_fmablk_mutex);
2174                 spin_lock_init(&dev->gnd_fmablk_lock);
2175                 init_waitqueue_head(&dev->gnd_waitq);
2176                 init_waitqueue_head(&dev->gnd_dgram_waitq);
2177                 init_waitqueue_head(&dev->gnd_dgping_waitq);
2178                 spin_lock_init(&dev->gnd_lock);
2179                 INIT_LIST_HEAD(&dev->gnd_map_list);
2180                 spin_lock_init(&dev->gnd_map_lock);
2181                 atomic_set(&dev->gnd_nfmablk, 0);
2182                 atomic_set(&dev->gnd_fmablk_vers, 1);
2183                 atomic_set(&dev->gnd_neps, 0);
2184                 atomic_set(&dev->gnd_canceled_dgrams, 0);
2185                 INIT_LIST_HEAD(&dev->gnd_connd_peers);
2186                 spin_lock_init(&dev->gnd_connd_lock);
2187                 spin_lock_init(&dev->gnd_dgram_lock);
2188                 spin_lock_init(&dev->gnd_rdmaq_lock);
2189                 INIT_LIST_HEAD(&dev->gnd_rdmaq);
2190                 init_rwsem(&dev->gnd_conn_sem);
2191
2192                 /* alloc & setup nid based dgram table */
2193                 LIBCFS_ALLOC(dev->gnd_dgrams,
2194                             sizeof(struct list_head) * *kgnilnd_tunables.kgn_peer_hash_size);
2195
2196                 if (dev->gnd_dgrams == NULL)
2197                         GOTO(failed, rc = -ENOMEM);
2198
2199                 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
2200                         INIT_LIST_HEAD(&dev->gnd_dgrams[i]);
2201                 }
2202                 atomic_set(&dev->gnd_ndgrams, 0);
2203                 atomic_set(&dev->gnd_nwcdgrams, 0);
2204                 /* setup timer for RDMAQ processing */
2205                 setup_timer(&dev->gnd_rdmaq_timer, kgnilnd_schedule_device_timer,
2206                             (unsigned long)dev);
2207
2208                 /* setup timer for mapping processing */
2209                 setup_timer(&dev->gnd_map_timer, kgnilnd_schedule_device_timer,
2210                             (unsigned long)dev);
2211
2212         }
2213
2214         /* CQID 0 isn't allowed, set to MAX_MSG_ID - 1 to check for conflicts early */
2215         kgnilnd_data.kgn_next_cqid = GNILND_MAX_MSG_ID - 1;
2216         kgnilnd_data.kgn_new_min_timeout = *kgnilnd_tunables.kgn_timeout;
2217         init_waitqueue_head(&kgnilnd_data.kgn_reaper_waitq);
2218         init_waitqueue_head(&kgnilnd_data.kgn_ruhroh_waitq);
2219         spin_lock_init(&kgnilnd_data.kgn_reaper_lock);
2220
2221         mutex_init(&kgnilnd_data.kgn_quiesce_mutex);
2222         atomic_set(&kgnilnd_data.kgn_nquiesce, 0);
2223         atomic_set(&kgnilnd_data.kgn_npending_conns, 0);
2224         atomic_set(&kgnilnd_data.kgn_npending_unlink, 0);
2225         atomic_set(&kgnilnd_data.kgn_npending_detach, 0);
2226         atomic_set(&kgnilnd_data.kgn_rev_offset, 0);
2227         atomic_set(&kgnilnd_data.kgn_rev_length, 0);
2228         atomic_set(&kgnilnd_data.kgn_rev_copy_buff, 0);
2229
2230         /* OK to call kgnilnd_api_shutdown() to cleanup now */
2231         kgnilnd_data.kgn_init = GNILND_INIT_DATA;
2232         try_module_get(THIS_MODULE);
2233
2234         rwlock_init(&kgnilnd_data.kgn_peer_conn_lock);
2235
2236         LIBCFS_ALLOC(kgnilnd_data.kgn_peers,
2237                     sizeof(struct list_head) * *kgnilnd_tunables.kgn_peer_hash_size);
2238
2239         if (kgnilnd_data.kgn_peers == NULL)
2240                 GOTO(failed, rc = -ENOMEM);
2241
2242         for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
2243                 INIT_LIST_HEAD(&kgnilnd_data.kgn_peers[i]);
2244         }
2245
2246         LIBCFS_ALLOC(kgnilnd_data.kgn_conns,
2247                     sizeof(struct list_head) * *kgnilnd_tunables.kgn_peer_hash_size);
2248
2249         if (kgnilnd_data.kgn_conns == NULL)
2250                 GOTO(failed, rc = -ENOMEM);
2251
2252         for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
2253                 INIT_LIST_HEAD(&kgnilnd_data.kgn_conns[i]);
2254         }
2255
2256         LIBCFS_ALLOC(kgnilnd_data.kgn_nets,
2257                     sizeof(struct list_head) * *kgnilnd_tunables.kgn_net_hash_size);
2258
2259         if (kgnilnd_data.kgn_nets == NULL)
2260                 GOTO(failed, rc = -ENOMEM);
2261
2262         for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
2263                 INIT_LIST_HEAD(&kgnilnd_data.kgn_nets[i]);
2264         }
2265
2266         kgnilnd_data.kgn_mbox_cache =
2267                 kmem_cache_create("kgn_mbox_block", KMALLOC_MAX_SIZE, 0,
2268                                   SLAB_HWCACHE_ALIGN, NULL);
2269         if (kgnilnd_data.kgn_mbox_cache == NULL) {
2270                 CERROR("Can't create slab for physical mbox blocks\n");
2271                 GOTO(failed, rc = -ENOMEM);
2272         }
2273
2274         kgnilnd_data.kgn_rx_cache =
2275                 kmem_cache_create("kgn_rx_t", sizeof(kgn_rx_t), 0, 0, NULL);
2276         if (kgnilnd_data.kgn_rx_cache == NULL) {
2277                 CERROR("Can't create slab for kgn_rx_t descriptors\n");
2278                 GOTO(failed, rc = -ENOMEM);
2279         }
2280
2281         kgnilnd_data.kgn_tx_cache =
2282                 kmem_cache_create("kgn_tx_t", sizeof(kgn_tx_t), 0, 0, NULL);
2283         if (kgnilnd_data.kgn_tx_cache == NULL) {
2284                 CERROR("Can't create slab for kgn_tx_t\n");
2285                 GOTO(failed, rc = -ENOMEM);
2286         }
2287
2288         kgnilnd_data.kgn_tx_phys_cache =
2289                 kmem_cache_create("kgn_tx_phys",
2290                                    LNET_MAX_IOV * sizeof(gni_mem_segment_t),
2291                                    0, 0, NULL);
2292         if (kgnilnd_data.kgn_tx_phys_cache == NULL) {
2293                 CERROR("Can't create slab for kgn_tx_phys\n");
2294                 GOTO(failed, rc = -ENOMEM);
2295         }
2296
2297         kgnilnd_data.kgn_dgram_cache =
2298                 kmem_cache_create("kgn_dgram_t", sizeof(kgn_dgram_t), 0, 0, NULL);
2299         if (kgnilnd_data.kgn_dgram_cache == NULL) {
2300                 CERROR("Can't create slab for outgoing datagrams\n");
2301                 GOTO(failed, rc = -ENOMEM);
2302         }
2303
2304         /* allocate a MAX_IOV array of page pointers for each cpu */
2305         kgnilnd_data.kgn_cksum_map_pages = kmalloc(num_possible_cpus() * sizeof (struct page *),
2306                                                    GFP_KERNEL);
2307         if (kgnilnd_data.kgn_cksum_map_pages == NULL) {
2308                 CERROR("Can't allocate vmap cksum pages\n");
2309                 GOTO(failed, rc = -ENOMEM);
2310         }
2311         kgnilnd_data.kgn_cksum_npages = num_possible_cpus();
2312         memset(kgnilnd_data.kgn_cksum_map_pages, 0,
2313                 kgnilnd_data.kgn_cksum_npages * sizeof (struct page *));
2314
2315         for (i = 0; i < kgnilnd_data.kgn_cksum_npages; i++) {
2316                 kgnilnd_data.kgn_cksum_map_pages[i] = kmalloc(LNET_MAX_IOV * sizeof (struct page *),
2317                                                               GFP_KERNEL);
2318                 if (kgnilnd_data.kgn_cksum_map_pages[i] == NULL) {
2319                         CERROR("Can't allocate vmap cksum pages for cpu %d\n", i);
2320                         GOTO(failed, rc = -ENOMEM);
2321                 }
2322         }
2323
2324         LASSERT(kgnilnd_data.kgn_ndevs == 0);
2325
2326         /* Use all available GNI devices */
2327         for (i = 0; i < GNILND_MAXDEVS; i++) {
2328                 dev = &kgnilnd_data.kgn_devices[kgnilnd_data.kgn_ndevs];
2329
2330                 rc = kgnilnd_dev_init(dev);
2331                 if (rc == 0) {
2332                         /* Increment here so base_shutdown cleans it up */
2333                         kgnilnd_data.kgn_ndevs++;
2334
2335                         rc = kgnilnd_allocate_phys_fmablk(dev);
2336                         if (rc)
2337                                 GOTO(failed, rc);
2338                 }
2339         }
2340
2341         if (kgnilnd_data.kgn_ndevs == 0) {
2342                 CERROR("Can't initialise any GNI devices\n");
2343                 GOTO(failed, rc = -ENODEV);
2344         }
2345
2346         rc = kgnilnd_thread_start(kgnilnd_reaper, NULL, "kgnilnd_rpr", 0);
2347         if (rc != 0) {
2348                 CERROR("Can't spawn gnilnd reaper: %d\n", rc);
2349                 GOTO(failed, rc);
2350         }
2351
2352         rc = kgnilnd_start_rca_thread();
2353         if (rc != 0) {
2354                 CERROR("Can't spawn gnilnd rca: %d\n", rc);
2355                 GOTO(failed, rc);
2356         }
2357
2358         /*
2359          * Start ruhroh thread.  We can't use kgnilnd_thread_start() because
2360          * we don't want this thread included in kgnilnd_data.kgn_nthreads
2361          * count.  This thread controls quiesce, so it mustn't
2362          * quiesce itself.
2363          */
2364         thrd = kthread_run(kgnilnd_ruhroh_thread, NULL, "%s_%02d", "kgnilnd_rr", 0);
2365         if (IS_ERR(thrd)) {
2366                 rc = PTR_ERR(thrd);
2367                 CERROR("Can't spawn gnilnd ruhroh thread: %d\n", rc);
2368                 GOTO(failed, rc);
2369         }
2370
2371         /* threads will load balance across devs as they are available */
2372         for (i = 0; i < *kgnilnd_tunables.kgn_sched_threads; i++) {
2373                 rc = kgnilnd_thread_start(kgnilnd_scheduler, (void *)((long)i),
2374                                           "kgnilnd_sd", i);
2375                 if (rc != 0) {
2376                         CERROR("Can't spawn gnilnd scheduler[%d]: %d\n",
2377                                i, rc);
2378                         GOTO(failed, rc);
2379                 }
2380         }
2381
2382         for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
2383                 dev = &kgnilnd_data.kgn_devices[i];
2384                 rc = kgnilnd_thread_start(kgnilnd_dgram_mover, dev,
2385                                           "kgnilnd_dg", dev->gnd_id);
2386                 if (rc != 0) {
2387                         CERROR("Can't spawn gnilnd dgram_mover[%d]: %d\n",
2388                                dev->gnd_id, rc);
2389                         GOTO(failed, rc);
2390                 }
2391
2392                 rc = kgnilnd_thread_start(kgnilnd_dgram_waitq, dev,
2393                                           "kgnilnd_dgn", dev->gnd_id);
2394                 if (rc != 0) {
2395                         CERROR("Can't spawn gnilnd dgram_waitq[%d]: %d\n",
2396                                 dev->gnd_id, rc);
2397                         GOTO(failed, rc);
2398                 }
2399
2400                 rc = kgnilnd_setup_wildcard_dgram(dev);
2401
2402                 if (rc != 0) {
2403                         CERROR("Can't create wildcard dgrams[%d]: %d\n",
2404                                 dev->gnd_id, rc);
2405                         GOTO(failed, rc);
2406                 }
2407         }
2408
2409
2410
2411         /* flag everything initialised */
2412         kgnilnd_data.kgn_init = GNILND_INIT_ALL;
2413         /*****************************************************/
2414
2415         CDEBUG(D_MALLOC, "initial kmem %d\n", pkmem);
2416         RETURN(0);
2417
2418 failed:
2419         kgnilnd_base_shutdown();
2420         kgnilnd_data.kgn_init = GNILND_INIT_NOTHING;
2421         RETURN(rc);
2422 }
2423
2424 void
2425 kgnilnd_base_shutdown(void)
2426 {
2427         int                     i, j;
2428         ENTRY;
2429
2430         while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_PAUSE_SHUTDOWN, 1)) {};
2431
2432         kgnilnd_data.kgn_wc_kill = 1;
2433
2434         for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
2435                 kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
2436                 kgnilnd_cancel_wc_dgrams(dev);
2437                 kgnilnd_cancel_dgrams(dev);
2438                 kgnilnd_del_conn_or_peer(NULL, LNET_NID_ANY, GNILND_DEL_PEER, -ESHUTDOWN);
2439                 kgnilnd_wait_for_canceled_dgrams(dev);
2440         }
2441
2442         /* We need to verify there are no conns left before we let the threads
2443          * shut down otherwise we could clean up the peers but still have
2444          * some outstanding conns due to orphaned datagram conns that are
2445          * being cleaned up.
2446          */
2447         i = 2;
2448         while (atomic_read(&kgnilnd_data.kgn_nconns) != 0) {
2449                 i++;
2450
2451                 for(j = 0; j < kgnilnd_data.kgn_ndevs; ++j) {
2452                         kgn_device_t *dev = &kgnilnd_data.kgn_devices[j];
2453                         kgnilnd_schedule_device(dev);
2454                 }
2455
2456                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2457                         "Waiting for conns to be cleaned up %d\n",atomic_read(&kgnilnd_data.kgn_nconns));
2458                 cfs_pause(cfs_time_seconds(1));
2459         }
2460         /* Peer state all cleaned up BEFORE setting shutdown, so threads don't
2461          * have to worry about shutdown races.  NB connections may be created
2462          * while there are still active connds, but these will be temporary
2463          * since peer creation always fails after the listener has started to
2464          * shut down.
2465          * all peers should have been cleared out on the nets */
2466         LASSERTF(atomic_read(&kgnilnd_data.kgn_npeers) == 0,
2467                 "peers left %d\n", atomic_read(&kgnilnd_data.kgn_npeers));
2468
2469         /* Wait for the ruhroh thread to shut down. */
2470         kgnilnd_data.kgn_ruhroh_shutdown = 1;
2471         wake_up(&kgnilnd_data.kgn_ruhroh_waitq);
2472         i = 2;
2473         while (kgnilnd_data.kgn_ruhroh_running != 0) {
2474                 i++;
2475                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2476                        "Waiting for ruhroh thread to terminate\n");
2477                 cfs_pause(cfs_time_seconds(1));
2478         }
2479
2480        /* Flag threads to terminate */
2481         kgnilnd_data.kgn_shutdown = 1;
2482
2483         for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
2484                 kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
2485
2486                 /* should clear all the MDDs */
2487                 kgnilnd_unmap_fma_blocks(dev);
2488
2489                 kgnilnd_schedule_device(dev);
2490                 wake_up_all(&dev->gnd_dgram_waitq);
2491                 wake_up_all(&dev->gnd_dgping_waitq);
2492                 LASSERT(list_empty(&dev->gnd_connd_peers));
2493         }
2494
2495         spin_lock(&kgnilnd_data.kgn_reaper_lock);
2496         wake_up_all(&kgnilnd_data.kgn_reaper_waitq);
2497         spin_unlock(&kgnilnd_data.kgn_reaper_lock);
2498
2499         kgnilnd_wakeup_rca_thread();
2500
2501         /* Wait for threads to exit */
2502         i = 2;
2503         while (atomic_read(&kgnilnd_data.kgn_nthreads) != 0) {
2504                 i++;
2505                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
2506                        "Waiting for %d threads to terminate\n",
2507                        atomic_read(&kgnilnd_data.kgn_nthreads));
2508                 cfs_pause(cfs_time_seconds(1));
2509         }
2510
2511         LASSERTF(atomic_read(&kgnilnd_data.kgn_npeers) == 0,
2512                 "peers left %d\n", atomic_read(&kgnilnd_data.kgn_npeers));
2513
2514         if (kgnilnd_data.kgn_peers != NULL) {
2515                 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++)
2516                         LASSERT(list_empty(&kgnilnd_data.kgn_peers[i]));
2517
2518                 LIBCFS_FREE(kgnilnd_data.kgn_peers,
2519                             sizeof (struct list_head) *
2520                             *kgnilnd_tunables.kgn_peer_hash_size);
2521         }
2522
2523         down_write(&kgnilnd_data.kgn_net_rw_sem);
2524         if (kgnilnd_data.kgn_nets != NULL) {
2525                 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++)
2526                         LASSERT(list_empty(&kgnilnd_data.kgn_nets[i]));
2527
2528                 LIBCFS_FREE(kgnilnd_data.kgn_nets,
2529                             sizeof (struct list_head) *
2530                             *kgnilnd_tunables.kgn_net_hash_size);
2531         }
2532         up_write(&kgnilnd_data.kgn_net_rw_sem);
2533
2534         LASSERTF(atomic_read(&kgnilnd_data.kgn_nconns) == 0,
2535                 "conns left %d\n", atomic_read(&kgnilnd_data.kgn_nconns));
2536
2537         if (kgnilnd_data.kgn_conns != NULL) {
2538                 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++)
2539                         LASSERT(list_empty(&kgnilnd_data.kgn_conns[i]));
2540
2541                 LIBCFS_FREE(kgnilnd_data.kgn_conns,
2542                             sizeof (struct list_head) *
2543                             *kgnilnd_tunables.kgn_peer_hash_size);
2544         }
2545
2546         for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
2547                 kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
2548                 kgnilnd_dev_fini(dev);
2549
2550                 LASSERTF(atomic_read(&dev->gnd_ndgrams) == 0,
2551                         "dgrams left %d\n", atomic_read(&dev->gnd_ndgrams));
2552
2553                 if (dev->gnd_dgrams != NULL) {
2554                         for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++)
2555                                 LASSERT(list_empty(&dev->gnd_dgrams[i]));
2556
2557                         LIBCFS_FREE(dev->gnd_dgrams,
2558                                     sizeof (struct list_head) *
2559                                     *kgnilnd_tunables.kgn_peer_hash_size);
2560                 }
2561
2562                 kgnilnd_free_phys_fmablk(dev);
2563         }
2564
2565         if (kgnilnd_data.kgn_mbox_cache != NULL)
2566                 kmem_cache_destroy(kgnilnd_data.kgn_mbox_cache);
2567
2568         if (kgnilnd_data.kgn_rx_cache != NULL)
2569                 kmem_cache_destroy(kgnilnd_data.kgn_rx_cache);
2570
2571         if (kgnilnd_data.kgn_tx_cache != NULL)
2572                 kmem_cache_destroy(kgnilnd_data.kgn_tx_cache);
2573
2574         if (kgnilnd_data.kgn_tx_phys_cache != NULL)
2575                 kmem_cache_destroy(kgnilnd_data.kgn_tx_phys_cache);
2576
2577         if (kgnilnd_data.kgn_dgram_cache != NULL)
2578                 kmem_cache_destroy(kgnilnd_data.kgn_dgram_cache);
2579
2580         if (kgnilnd_data.kgn_cksum_map_pages != NULL) {
2581                 for (i = 0; i < kgnilnd_data.kgn_cksum_npages; i++) {
2582                         if (kgnilnd_data.kgn_cksum_map_pages[i] != NULL) {
2583                                 kfree(kgnilnd_data.kgn_cksum_map_pages[i]);
2584                         }
2585                 }
2586                 kfree(kgnilnd_data.kgn_cksum_map_pages);
2587         }
2588
2589         CDEBUG(D_MALLOC, "after NAL cleanup: kmem %d\n",
2590                atomic_read(&libcfs_kmemory));
2591
2592         kgnilnd_data.kgn_init = GNILND_INIT_NOTHING;
2593         module_put(THIS_MODULE);
2594
2595         EXIT;
2596 }
2597
2598 int
2599 kgnilnd_startup(lnet_ni_t *ni)
2600 {
2601         int               rc, devno;
2602         kgn_net_t        *net;
2603         ENTRY;
2604
2605         LASSERTF(ni->ni_lnd == &the_kgnilnd,
2606                 "bad LND 0x%p != the_kgnilnd @ 0x%p\n",
2607                 ni->ni_lnd, &the_kgnilnd);
2608
2609         if (kgnilnd_data.kgn_init == GNILND_INIT_NOTHING) {
2610                 rc = kgnilnd_base_startup();
2611                 if (rc != 0)
2612                         RETURN(rc);
2613         }
2614
2615         /* Serialize with shutdown. */
2616         mutex_lock(&kgnilnd_data.kgn_quiesce_mutex);
2617
2618         LIBCFS_ALLOC(net, sizeof(*net));
2619         if (net == NULL) {
2620                 CERROR("could not allocate net for new interface instance\n");
2621                 /* no need to cleanup the CDM... */
2622                 GOTO(failed, rc = -ENOMEM);
2623         }
2624         INIT_LIST_HEAD(&net->gnn_list);
2625         ni->ni_data = net;
2626         net->gnn_ni = ni;
2627         ni->ni_maxtxcredits = *kgnilnd_tunables.kgn_credits;
2628         ni->ni_peertxcredits = *kgnilnd_tunables.kgn_peer_credits;
2629
2630         if (*kgnilnd_tunables.kgn_peer_health) {
2631                 int     fudge;
2632                 int     timeout;
2633                 /* give this a bit of leeway - we don't have a hard timeout
2634                  * as we only check timeouts periodically - see comment in kgnilnd_reaper */
2635                 fudge = (GNILND_TO2KA(*kgnilnd_tunables.kgn_timeout) / GNILND_REAPER_NCHECKS);
2636                 timeout = *kgnilnd_tunables.kgn_timeout + fudge;
2637
2638                 if (*kgnilnd_tunables.kgn_peer_timeout >= timeout)
2639                         ni->ni_peertimeout = *kgnilnd_tunables.kgn_peer_timeout;
2640                 else if (*kgnilnd_tunables.kgn_peer_timeout > -1) {
2641                         LCONSOLE_ERROR("Peer_timeout is set to %d but needs to be >= %d\n",
2642                                         *kgnilnd_tunables.kgn_peer_timeout,
2643                                         timeout);
2644                         ni->ni_data = NULL;
2645                         LIBCFS_FREE(net, sizeof(*net));
2646                         GOTO(failed, rc = -EINVAL);
2647                 } else
2648                         ni->ni_peertimeout = timeout;
2649
2650                 LCONSOLE_INFO("Enabling LNet peer health for gnilnd, timeout %ds\n",
2651                               ni->ni_peertimeout);
2652         }
2653
2654         atomic_set(&net->gnn_refcount, 1);
2655
2656         /* if we have multiple devices, spread the nets around */
2657         net->gnn_netnum = LNET_NETNUM(LNET_NIDNET(ni->ni_nid));
2658
2659         devno = LNET_NIDNET(ni->ni_nid) % GNILND_MAXDEVS;
2660         net->gnn_dev = &kgnilnd_data.kgn_devices[devno];
2661
2662         /* allocate a 'dummy' cdm for datagram use. We can only have a single
2663          * datagram between a nid:inst_id and nid2:inst_id. The fake cdm
2664          * give us additional inst_id to use, allowing the datagrams to flow
2665          * like rivers of honey and beer */
2666
2667         /* the instance id for the cdm is the NETNUM offset by MAXDEVS -
2668          * ensuring we'll have a unique id */
2669
2670
2671         ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), net->gnn_dev->gnd_nid);
2672         CDEBUG(D_NET, "adding net %p nid=%s on dev %d \n",
2673                 net, libcfs_nid2str(ni->ni_nid), net->gnn_dev->gnd_id);
2674         /* until the gnn_list is set, we need to cleanup ourselves as
2675          * kgnilnd_shutdown is just gonna get confused */
2676
2677         down_write(&kgnilnd_data.kgn_net_rw_sem);
2678         list_add_tail(&net->gnn_list, kgnilnd_netnum2netlist(net->gnn_netnum));
2679         up_write(&kgnilnd_data.kgn_net_rw_sem);
2680
2681         /* we need a separate thread to call probe_wait_by_id until
2682          * we get a function callback notifier from kgni */
2683         mutex_unlock(&kgnilnd_data.kgn_quiesce_mutex);
2684         RETURN(0);
2685  failed:
2686         mutex_unlock(&kgnilnd_data.kgn_quiesce_mutex);
2687         kgnilnd_shutdown(ni);
2688         RETURN(rc);
2689 }
2690
2691 void
2692 kgnilnd_shutdown(lnet_ni_t *ni)
2693 {
2694         kgn_net_t     *net = ni->ni_data;
2695         int           i;
2696         int           rc;
2697         ENTRY;
2698
2699         CFS_RACE(CFS_FAIL_GNI_SR_DOWN_RACE);
2700
2701         LASSERTF(kgnilnd_data.kgn_init == GNILND_INIT_ALL,
2702                 "init %d\n", kgnilnd_data.kgn_init);
2703
2704         /* Serialize with startup. */
2705         mutex_lock(&kgnilnd_data.kgn_quiesce_mutex);
2706         CDEBUG(D_MALLOC, "before NAL cleanup: kmem %d\n",
2707                atomic_read(&libcfs_kmemory));
2708
2709         if (net == NULL) {
2710                 CERROR("got NULL net for ni %p\n", ni);
2711                 GOTO(out, rc = -EINVAL);
2712         }
2713
2714         LASSERTF(ni == net->gnn_ni,
2715                 "ni %p gnn_ni %p\n", net, net->gnn_ni);
2716
2717         ni->ni_data = NULL;
2718
2719         LASSERT(!net->gnn_shutdown);
2720         LASSERTF(atomic_read(&net->gnn_refcount) != 0,
2721                 "net %p refcount %d\n",
2722                  net, atomic_read(&net->gnn_refcount));
2723
2724         if (!list_empty(&net->gnn_list)) {
2725                 /* serialize with peer creation */
2726                 down_write(&kgnilnd_data.kgn_net_rw_sem);
2727                 net->gnn_shutdown = 1;
2728                 up_write(&kgnilnd_data.kgn_net_rw_sem);
2729
2730                 kgnilnd_cancel_net_dgrams(net);
2731
2732                 kgnilnd_del_conn_or_peer(net, LNET_NID_ANY, GNILND_DEL_PEER, -ESHUTDOWN);
2733
2734                 /* if we are quiesced, need to wake up - we need those threads
2735                  * alive to release peers, etc */
2736                 if (GNILND_IS_QUIESCED) {
2737                         set_mb(kgnilnd_data.kgn_quiesce_trigger, GNILND_QUIESCE_IDLE);
2738                         kgnilnd_quiesce_wait("shutdown");
2739                 }
2740
2741                 kgnilnd_wait_for_canceled_dgrams(net->gnn_dev);
2742
2743                 /* We wait until the nets ref's are 1, we will release final ref which is ours
2744                  * this allows us to make sure everything else is done before we free the
2745                  * net.
2746                  */
2747                 i = 4;
2748                 while (atomic_read(&net->gnn_refcount) != 1) {
2749                         i++;
2750                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2751                                 "Waiting for %d references to clear on net %d\n",
2752                                 atomic_read(&net->gnn_refcount),
2753                                 net->gnn_netnum);
2754                         cfs_pause(cfs_time_seconds(1));
2755                 }
2756
2757                 /* release ref from kgnilnd_startup */
2758                 kgnilnd_net_decref(net);
2759                 /* serialize with reaper and conn_task looping */
2760                 down_write(&kgnilnd_data.kgn_net_rw_sem);
2761                 list_del_init(&net->gnn_list);
2762                 up_write(&kgnilnd_data.kgn_net_rw_sem);
2763
2764         }
2765
2766         /* not locking, this can't race with writers */
2767         LASSERTF(atomic_read(&net->gnn_refcount) == 0,
2768                 "net %p refcount %d\n",
2769                  net, atomic_read(&net->gnn_refcount));
2770         LIBCFS_FREE(net, sizeof(*net));
2771
2772 out:
2773         down_read(&kgnilnd_data.kgn_net_rw_sem);
2774         for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
2775                 if (!list_empty(&kgnilnd_data.kgn_nets[i])) {
2776                         up_read(&kgnilnd_data.kgn_net_rw_sem);
2777                         break;
2778                 }
2779
2780                 if (i == *kgnilnd_tunables.kgn_net_hash_size - 1) {
2781                         up_read(&kgnilnd_data.kgn_net_rw_sem);
2782                         kgnilnd_base_shutdown();
2783                 }
2784         }
2785         CDEBUG(D_MALLOC, "after NAL cleanup: kmem %d\n",
2786                atomic_read(&libcfs_kmemory));
2787
2788         mutex_unlock(&kgnilnd_data.kgn_quiesce_mutex);
2789         EXIT;
2790 }
2791
2792 void __exit
2793 kgnilnd_module_fini(void)
2794 {
2795         lnet_unregister_lnd(&the_kgnilnd);
2796         kgnilnd_proc_fini();
2797         kgnilnd_remove_sysctl();
2798         kgnilnd_tunables_fini();
2799 }
2800
2801 int __init
2802 kgnilnd_module_init(void)
2803 {
2804         int    rc;
2805
2806         rc = kgnilnd_tunables_init();
2807         if (rc != 0)
2808                 return rc;
2809
2810         printk(KERN_INFO "Lustre: kgnilnd build version: "KGNILND_BUILD_REV"\n");
2811
2812         kgnilnd_insert_sysctl();
2813         kgnilnd_proc_init();
2814
2815         lnet_register_lnd(&the_kgnilnd);
2816
2817         return 0;
2818 }
2819
2820 MODULE_AUTHOR("Cray, Inc. <nic@cray.com>");
2821 MODULE_DESCRIPTION("Kernel Gemini LND v"KGNILND_BUILD_REV);
2822 MODULE_LICENSE("GPL");
2823
2824 module_init(kgnilnd_module_init);
2825 module_exit(kgnilnd_module_fini);