lnet/klnds/gnilnd/gnilnd.c

   1 /*
   2  * Copyright (C) 2012 Cray, Inc.
   3  *
   4  * Copyright (c) 2013, 2017, Intel Corporation.
   5  *
   6  *   Author: Nic Henke <nic@cray.com>
   7  *   Author: James Shimek <jshimek@cray.com>
   8  *
   9  *   This file is part of Lustre, http://www.lustre.org.
  10  *
  11  *   Lustre is free software; you can redistribute it and/or
  12  *   modify it under the terms of version 2 of the GNU General Public
  13  *   License as published by the Free Software Foundation.
  14  *
  15  *   Lustre is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with Lustre; if not, write to the Free Software
  22  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  */
  25 #include "gnilnd.h"
  26
  27 /* Primary entry points from LNET.  There are no guarantees against reentrance. */
  28 struct lnet_lnd the_kgnilnd = {
  29         .lnd_type       = GNILND,
  30         .lnd_startup    = kgnilnd_startup,
  31         .lnd_shutdown   = kgnilnd_shutdown,
  32         .lnd_ctl        = kgnilnd_ctl,
  33         .lnd_send       = kgnilnd_send,
  34         .lnd_recv       = kgnilnd_recv,
  35         .lnd_eager_recv = kgnilnd_eager_recv,
  36         .lnd_query      = kgnilnd_query,
  37 };
  38
  39 kgn_data_t      kgnilnd_data;
  40
  41 int
  42 kgnilnd_thread_start(int(*fn)(void *arg), void *arg, char *name, int id)
  43 {
  44         struct task_struct *thrd;
  45
  46         thrd = kthread_run(fn, arg, "%s_%02d", name, id);
  47         if (IS_ERR(thrd))
  48                 return PTR_ERR(thrd);
  49
  50         atomic_inc(&kgnilnd_data.kgn_nthreads);
  51         return 0;
  52 }
  53
  54 /* bind scheduler threads to cpus */
  55 int
  56 kgnilnd_start_sd_threads(void)
  57 {
  58         int cpu;
  59         int i = 0;
  60         struct task_struct *task;
  61
  62         for_each_online_cpu(cpu) {
  63                 /* don't bind to cpu 0 - all interrupts are processed here */
  64                 if (cpu == 0)
  65                         continue;
  66
  67                 task = kthread_create(kgnilnd_scheduler, (void *)((long)i),
  68                                       "%s_%02d", "kgnilnd_sd", i);
  69                 if (!IS_ERR(task)) {
  70                         kthread_bind(task, cpu);
  71                         wake_up_process(task);
  72                 } else {
  73                         CERROR("Can't spawn gnilnd scheduler[%d] %ld\n", i,
  74                                 PTR_ERR(task));
  75                         return PTR_ERR(task);
  76                 }
  77                 atomic_inc(&kgnilnd_data.kgn_nthreads);
  78
  79                 if (++i >= *kgnilnd_tunables.kgn_sched_threads) {
  80                         break;
  81                 }
  82         }
  83
  84         return 0;
  85 }
  86
  87 /* needs write_lock on kgn_peer_conn_lock */
  88 int
  89 kgnilnd_close_stale_conns_locked(kgn_peer_t *peer, kgn_conn_t *newconn)
  90 {
  91         kgn_conn_t         *conn;
  92         struct list_head   *ctmp, *cnxt;
  93         int                 loopback;
  94         int                 count = 0;
  95
  96         loopback = peer->gnp_nid == peer->gnp_net->gnn_ni->ni_nid;
  97
  98         list_for_each_safe(ctmp, cnxt, &peer->gnp_conns) {
  99                 conn = list_entry(ctmp, kgn_conn_t, gnc_list);
 100
 101                 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
 102                         continue;
 103
 104                 if (conn == newconn)
 105                         continue;
 106
 107                 if (conn->gnc_device != newconn->gnc_device)
 108                         continue;
 109
 110                 /* This is a two connection loopback - one talking to the other */
 111                 if (loopback &&
 112                     newconn->gnc_my_connstamp == conn->gnc_peer_connstamp &&
 113                     newconn->gnc_peer_connstamp == conn->gnc_my_connstamp) {
 114                         CDEBUG(D_NET, "skipping prune of %p, "
 115                                 "loopback and matching stamps"
 116                                 " connstamp %llu(%llu)"
 117                                 " peerstamp %llu(%llu)\n",
 118                                 conn, newconn->gnc_my_connstamp,
 119                                 conn->gnc_peer_connstamp,
 120                                 newconn->gnc_peer_connstamp,
 121                                 conn->gnc_my_connstamp);
 122                         continue;
 123                 }
 124
 125                 if (conn->gnc_peerstamp != newconn->gnc_peerstamp) {
 126                         LASSERTF(conn->gnc_peerstamp < newconn->gnc_peerstamp,
 127                                 "conn 0x%p peerstamp %llu >= "
 128                                 "newconn 0x%p peerstamp %llu\n",
 129                                 conn, conn->gnc_peerstamp,
 130                                 newconn, newconn->gnc_peerstamp);
 131
 132                         CDEBUG(D_NET, "Closing stale conn nid: %s "
 133                                " peerstamp:%#llx(%#llx)\n",
 134                                libcfs_nid2str(peer->gnp_nid),
 135                                conn->gnc_peerstamp, newconn->gnc_peerstamp);
 136                 } else {
 137
 138                         LASSERTF(conn->gnc_peer_connstamp < newconn->gnc_peer_connstamp,
 139                                 "conn 0x%p peer_connstamp %llu >= "
 140                                 "newconn 0x%p peer_connstamp %llu\n",
 141                                 conn, conn->gnc_peer_connstamp,
 142                                 newconn, newconn->gnc_peer_connstamp);
 143
 144                         CDEBUG(D_NET, "Closing stale conn nid: %s"
 145                                " connstamp:%llu(%llu)\n",
 146                                libcfs_nid2str(peer->gnp_nid),
 147                                conn->gnc_peer_connstamp, newconn->gnc_peer_connstamp);
 148                 }
 149
 150                 count++;
 151                 kgnilnd_close_conn_locked(conn, -ESTALE);
 152         }
 153
 154         if (count != 0) {
 155                 CWARN("Closed %d stale conns to %s\n", count, libcfs_nid2str(peer->gnp_nid));
 156         }
 157
 158         RETURN(count);
 159 }
 160
 161 int
 162 kgnilnd_conn_isdup_locked(kgn_peer_t *peer, kgn_conn_t *newconn)
 163 {
 164         kgn_conn_t       *conn;
 165         struct list_head *tmp;
 166         int               loopback;
 167         ENTRY;
 168
 169         loopback = peer->gnp_nid == peer->gnp_net->gnn_ni->ni_nid;
 170
 171         list_for_each(tmp, &peer->gnp_conns) {
 172                 conn = list_entry(tmp, kgn_conn_t, gnc_list);
 173                 CDEBUG(D_NET, "checking conn 0x%p for peer %s"
 174                         " lo %d new %llu existing %llu"
 175                         " new peer %llu existing peer %llu"
 176                         " new dev %p existing dev %p\n",
 177                         conn, libcfs_nid2str(peer->gnp_nid),
 178                         loopback,
 179                         newconn->gnc_peerstamp, conn->gnc_peerstamp,
 180                         newconn->gnc_peer_connstamp, conn->gnc_peer_connstamp,
 181                         newconn->gnc_device, conn->gnc_device);
 182
 183                 /* conn is in the process of closing */
 184                 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
 185                         continue;
 186
 187                 /* 'newconn' is from an earlier version of 'peer'!!! */
 188                 if (newconn->gnc_peerstamp < conn->gnc_peerstamp)
 189                         RETURN(1);
 190
 191                 /* 'conn' is from an earlier version of 'peer': it will be
 192                  * removed when we cull stale conns later on... */
 193                 if (newconn->gnc_peerstamp > conn->gnc_peerstamp)
 194                         continue;
 195
 196                 /* Different devices are OK */
 197                 if (conn->gnc_device != newconn->gnc_device)
 198                         continue;
 199
 200                 /* It's me connecting to myself */
 201                 if (loopback &&
 202                     newconn->gnc_my_connstamp == conn->gnc_peer_connstamp &&
 203                     newconn->gnc_peer_connstamp == conn->gnc_my_connstamp)
 204                         continue;
 205
 206                 /* 'newconn' is an earlier connection from 'peer'!!! */
 207                 if (newconn->gnc_peer_connstamp < conn->gnc_peer_connstamp)
 208                         RETURN(2);
 209
 210                 /* 'conn' is an earlier connection from 'peer': it will be
 211                  * removed when we cull stale conns later on... */
 212                 if (newconn->gnc_peer_connstamp > conn->gnc_peer_connstamp)
 213                         continue;
 214
 215                 /* 'newconn' has the SAME connection stamp; 'peer' isn't
 216                  * playing the game... */
 217                 RETURN(3);
 218         }
 219
 220         RETURN(0);
 221 }
 222
 223 int
 224 kgnilnd_create_conn(kgn_conn_t **connp, kgn_device_t *dev)
 225 {
 226         kgn_conn_t      *conn;
 227         gni_return_t    rrc;
 228         int             rc = 0;
 229
 230         LASSERT (!in_interrupt());
 231         atomic_inc(&kgnilnd_data.kgn_nconns);
 232
 233         /* divide by 2 to allow for complete reset and immediate reconnect */
 234         if (atomic_read(&kgnilnd_data.kgn_nconns) >= GNILND_MAX_CQID/2) {
 235                 CERROR("Too many conn are live: %d > %d\n",
 236                         atomic_read(&kgnilnd_data.kgn_nconns), GNILND_MAX_CQID/2);
 237                 atomic_dec(&kgnilnd_data.kgn_nconns);
 238                 return -E2BIG;
 239         }
 240
 241         LIBCFS_ALLOC(conn, sizeof(*conn));
 242         if (conn == NULL) {
 243                 atomic_dec(&kgnilnd_data.kgn_nconns);
 244                 return -ENOMEM;
 245         }
 246
 247         conn->gnc_tx_ref_table =
 248                 kgnilnd_vzalloc(GNILND_MAX_MSG_ID * sizeof(void *));
 249         if (conn->gnc_tx_ref_table == NULL) {
 250                 CERROR("Can't allocate conn tx_ref_table\n");
 251                 GOTO(failed, rc = -ENOMEM);
 252         }
 253
 254         mutex_init(&conn->gnc_smsg_mutex);
 255         mutex_init(&conn->gnc_rdma_mutex);
 256         atomic_set(&conn->gnc_refcount, 1);
 257         atomic_set(&conn->gnc_reaper_noop, 0);
 258         atomic_set(&conn->gnc_sched_noop, 0);
 259         atomic_set(&conn->gnc_tx_in_use, 0);
 260         INIT_LIST_HEAD(&conn->gnc_list);
 261         INIT_LIST_HEAD(&conn->gnc_hashlist);
 262         INIT_LIST_HEAD(&conn->gnc_schedlist);
 263         INIT_LIST_HEAD(&conn->gnc_fmaq);
 264         INIT_LIST_HEAD(&conn->gnc_mdd_list);
 265         INIT_LIST_HEAD(&conn->gnc_delaylist);
 266         spin_lock_init(&conn->gnc_list_lock);
 267         spin_lock_init(&conn->gnc_tx_lock);
 268         conn->gnc_magic = GNILND_CONN_MAGIC;
 269
 270         /* set tx id to nearly the end to make sure we find wrapping
 271          * issues soon */
 272         conn->gnc_next_tx = (int) GNILND_MAX_MSG_ID - 10;
 273
 274         /* if this fails, we have conflicts and MAX_TX is too large */
 275         CLASSERT(GNILND_MAX_MSG_ID < GNILND_MSGID_CLOSE);
 276
 277         /* get a new unique CQ id for this conn */
 278         write_lock(&kgnilnd_data.kgn_peer_conn_lock);
 279         conn->gnc_my_connstamp = kgnilnd_data.kgn_connstamp++;
 280         conn->gnc_cqid = kgnilnd_get_cqid_locked();
 281         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
 282
 283         if (conn->gnc_cqid == 0) {
 284                 CERROR("Could not allocate unique CQ ID for conn 0x%p\n", conn);
 285                 GOTO(failed, rc = -E2BIG);
 286         }
 287
 288         CDEBUG(D_NET, "alloc cqid %u for conn 0x%p\n",
 289                 conn->gnc_cqid, conn);
 290
 291         /* need to be set before gnc_ephandle to allow kgnilnd_destroy_conn_ep to
 292          * check context */
 293         conn->gnc_device = dev;
 294
 295         conn->gnc_timeout = MAX(*kgnilnd_tunables.kgn_timeout,
 296                                 GNILND_MIN_TIMEOUT);
 297         kgnilnd_update_reaper_timeout(conn->gnc_timeout);
 298
 299         /* this is the ep_handle for doing SMSG & BTE */
 300         mutex_lock(&dev->gnd_cq_mutex);
 301         rrc = kgnilnd_ep_create(dev->gnd_handle, dev->gnd_snd_fma_cqh,
 302                                 &conn->gnc_ephandle);
 303         mutex_unlock(&dev->gnd_cq_mutex);
 304         if (rrc != GNI_RC_SUCCESS)
 305                 GOTO(failed, rc = -ENETDOWN);
 306
 307         CDEBUG(D_NET, "created conn 0x%p ep_hndl 0x%p\n",
 308                conn, conn->gnc_ephandle);
 309
 310         /* add ref for EP canceling */
 311         kgnilnd_conn_addref(conn);
 312         atomic_inc(&dev->gnd_neps);
 313
 314         *connp = conn;
 315         return 0;
 316
 317 failed:
 318         atomic_dec(&kgnilnd_data.kgn_nconns);
 319         kgnilnd_vfree(conn->gnc_tx_ref_table,
 320                       GNILND_MAX_MSG_ID * sizeof(void *));
 321         LIBCFS_FREE(conn, sizeof(*conn));
 322         return rc;
 323 }
 324
 325 /* needs to be called with kgn_peer_conn_lock held (read or write) */
 326 kgn_conn_t *
 327 kgnilnd_find_conn_locked(kgn_peer_t *peer)
 328 {
 329         kgn_conn_t      *conn = NULL;
 330
 331         /* if we are in reset, this conn is going to die soon */
 332         if (unlikely(kgnilnd_data.kgn_in_reset)) {
 333                 RETURN(NULL);
 334         }
 335
 336         /* just return the first ESTABLISHED connection */
 337         list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
 338                 /* kgnilnd_finish_connect doesn't put connections on the
 339                  * peer list until they are actually established */
 340                 LASSERTF(conn->gnc_state >= GNILND_CONN_ESTABLISHED,
 341                         "found conn %p state %s on peer %p (%s)\n",
 342                         conn, kgnilnd_conn_state2str(conn), peer,
 343                         libcfs_nid2str(peer->gnp_nid));
 344                 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
 345                         continue;
 346
 347                 RETURN(conn);
 348         }
 349         RETURN(NULL);
 350 }
 351
 352 /* needs write_lock on kgn_peer_conn_lock held */
 353 kgn_conn_t *
 354 kgnilnd_find_or_create_conn_locked(kgn_peer_t *peer) {
 355
 356         kgn_device_t    *dev = peer->gnp_net->gnn_dev;
 357         kgn_conn_t      *conn;
 358
 359         conn = kgnilnd_find_conn_locked(peer);
 360
 361         if (conn != NULL) {
 362                 return conn;
 363         }
 364
 365         /* if the peer was previously connecting, check if we should
 366          * trigger another connection attempt yet. */
 367         if (time_before(jiffies, peer->gnp_reconnect_time)) {
 368                 return NULL;
 369         }
 370
 371         /* This check prevents us from creating a new connection to a peer while we are
 372          * still in the process of closing an existing connection to the peer.
 373          */
 374         list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
 375                 if (conn->gnc_ephandle != NULL) {
 376                         CDEBUG(D_NET, "Not connecting non-null ephandle found peer 0x%p->%s\n", peer,
 377                                 libcfs_nid2str(peer->gnp_nid));
 378                         return NULL;
 379                 }
 380         }
 381
 382         if (peer->gnp_connecting != GNILND_PEER_IDLE) {
 383                 /* if we are not connecting, fire up a new connection */
 384                 /* or if we are anything but IDLE DONT start a new connection */
 385                return NULL;
 386         }
 387
 388         CDEBUG(D_NET, "starting connect to %s\n",
 389                 libcfs_nid2str(peer->gnp_nid));
 390         peer->gnp_connecting = GNILND_PEER_CONNECT;
 391         kgnilnd_peer_addref(peer); /* extra ref for connd */
 392
 393         spin_lock(&dev->gnd_connd_lock);
 394         list_add_tail(&peer->gnp_connd_list, &dev->gnd_connd_peers);
 395         spin_unlock(&dev->gnd_connd_lock);
 396
 397         kgnilnd_schedule_dgram(dev);
 398         CDEBUG(D_NETTRACE, "scheduling new connect\n");
 399
 400         return NULL;
 401 }
 402
 403 /* Caller is responsible for deciding if/when to call this */
 404 void
 405 kgnilnd_destroy_conn_ep(kgn_conn_t *conn)
 406 {
 407         gni_return_t    rrc;
 408         gni_ep_handle_t tmp_ep;
 409
 410         /* only if we actually initialized it,
 411          *  then set NULL to tell kgnilnd_destroy_conn to leave it alone */
 412
 413         tmp_ep = xchg(&conn->gnc_ephandle, NULL);
 414         if (tmp_ep != NULL) {
 415                 /* we never re-use the EP, so unbind is not needed */
 416                 mutex_lock(&conn->gnc_device->gnd_cq_mutex);
 417                 rrc = kgnilnd_ep_destroy(tmp_ep);
 418
 419                 mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
 420
 421                 /* if this fails, it could hork up kgni smsg retransmit and others
 422                  * since we could free the SMSG mbox memory, etc. */
 423                 LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d conn 0x%p ep 0x%p\n",
 424                          rrc, conn, conn->gnc_ephandle);
 425
 426                 atomic_dec(&conn->gnc_device->gnd_neps);
 427
 428                 /* clear out count added in kgnilnd_close_conn_locked
 429                  * conn will have a peer once it hits finish_connect, where it
 430                  * is the first spot we'll mark it ESTABLISHED as well */
 431                 if (conn->gnc_peer) {
 432                         kgnilnd_admin_decref(conn->gnc_peer->gnp_dirty_eps);
 433                 }
 434
 435                 /* drop ref for EP */
 436                 kgnilnd_conn_decref(conn);
 437         }
 438 }
 439
 440 void
 441 kgnilnd_destroy_conn(kgn_conn_t *conn)
 442 {
 443         LASSERTF(!in_interrupt() &&
 444                 !conn->gnc_scheduled &&
 445                 !conn->gnc_in_purgatory &&
 446                 conn->gnc_ephandle == NULL &&
 447                 list_empty(&conn->gnc_list) &&
 448                 list_empty(&conn->gnc_hashlist) &&
 449                 list_empty(&conn->gnc_schedlist) &&
 450                 list_empty(&conn->gnc_mdd_list) &&
 451                 list_empty(&conn->gnc_delaylist) &&
 452                 conn->gnc_magic == GNILND_CONN_MAGIC,
 453                 "conn 0x%p->%s IRQ %d sched %d purg %d ep 0x%p Mg %d lists %d/%d/%d/%d/%d\n",
 454                 conn, conn->gnc_peer ? libcfs_nid2str(conn->gnc_peer->gnp_nid)
 455                                      : "<?>",
 456                 !!in_interrupt(), conn->gnc_scheduled,
 457                 conn->gnc_in_purgatory,
 458                 conn->gnc_ephandle,
 459                 conn->gnc_magic,
 460                 list_empty(&conn->gnc_list),
 461                 list_empty(&conn->gnc_hashlist),
 462                 list_empty(&conn->gnc_schedlist),
 463                 list_empty(&conn->gnc_mdd_list),
 464                 list_empty(&conn->gnc_delaylist));
 465
 466         /* Tripping these is especially bad, as it means we have items on the
 467          *  lists that didn't keep their refcount on the connection - or
 468          *  somebody evil released their own */
 469         LASSERTF(list_empty(&conn->gnc_fmaq) &&
 470                  atomic_read(&conn->gnc_nlive_fma) == 0 &&
 471                  atomic_read(&conn->gnc_nlive_rdma) == 0,
 472                  "conn 0x%p fmaq %d@0x%p nfma %d nrdma %d\n",
 473                  conn, kgnilnd_count_list(&conn->gnc_fmaq), &conn->gnc_fmaq,
 474                  atomic_read(&conn->gnc_nlive_fma), atomic_read(&conn->gnc_nlive_rdma));
 475
 476         CDEBUG(D_NET, "destroying conn %p ephandle %p error %d\n",
 477                 conn, conn->gnc_ephandle, conn->gnc_error);
 478
 479         /* We are freeing this memory remove the magic value from the connection */
 480         conn->gnc_magic = 0;
 481
 482         /* if there is an FMA blk left here, we'll tear it down */
 483         if (conn->gnc_fma_blk) {
 484                 if (conn->gnc_peer) {
 485                         kgn_mbox_info_t *mbox;
 486                         mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
 487                         mbox->mbx_prev_nid = conn->gnc_peer->gnp_nid;
 488                 }
 489                 kgnilnd_release_mbox(conn, 0);
 490         }
 491
 492         if (conn->gnc_peer != NULL)
 493                 kgnilnd_peer_decref(conn->gnc_peer);
 494
 495         if (conn->gnc_tx_ref_table != NULL) {
 496                 kgnilnd_vfree(conn->gnc_tx_ref_table,
 497                               GNILND_MAX_MSG_ID * sizeof(void *));
 498         }
 499
 500         LIBCFS_FREE(conn, sizeof(*conn));
 501         atomic_dec(&kgnilnd_data.kgn_nconns);
 502 }
 503
 504 /* peer_alive and peer_notify done in the style of the o2iblnd */
 505 void
 506 kgnilnd_peer_alive(kgn_peer_t *peer)
 507 {
 508         time64_t now = ktime_get_seconds();
 509
 510         set_mb(peer->gnp_last_alive, now);
 511 }
 512
 513 void
 514 kgnilnd_peer_notify(kgn_peer_t *peer, int error, int alive)
 515 {
 516         int                     tell_lnet = 0;
 517         int                     nnets = 0;
 518         int                     rc;
 519         int                     i, j;
 520         kgn_conn_t             *conn;
 521         kgn_net_t             **nets;
 522         kgn_net_t              *net;
 523
 524
 525         if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DONT_NOTIFY))
 526                 return;
 527
 528         /* Tell LNet we are giving ups on this peer - but only
 529          * if it isn't already reconnected or trying to reconnect */
 530         read_lock(&kgnilnd_data.kgn_peer_conn_lock);
 531
 532         /* use kgnilnd_find_conn_locked to avoid any conns in the process of being nuked
 533          *
 534          * don't tell LNet if we are in reset - we assume that everyone will be able to
 535          * reconnect just fine
 536          */
 537         conn = kgnilnd_find_conn_locked(peer);
 538
 539         CDEBUG(D_NETTRACE, "peer 0x%p->%s ting %d conn 0x%p, rst %d error %d\n",
 540                peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting, conn,
 541                kgnilnd_data.kgn_in_reset, error);
 542
 543         if (((peer->gnp_connecting == GNILND_PEER_IDLE) &&
 544             (conn == NULL) &&
 545             (!kgnilnd_data.kgn_in_reset) &&
 546             (!kgnilnd_conn_clean_errno(error))) || alive) {
 547                 tell_lnet = 1;
 548         }
 549
 550         read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
 551
 552         if (!tell_lnet) {
 553                 /* short circuit if we dont need to notify Lnet */
 554                 return;
 555         }
 556
 557         rc = down_read_trylock(&kgnilnd_data.kgn_net_rw_sem);
 558
 559         if (rc) {
 560             /* dont do this if this fails since LNET is in shutdown or something else
 561              */
 562
 563                 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
 564                         list_for_each_entry(net , &kgnilnd_data.kgn_nets[i], gnn_list) {
 565                                 /* if gnn_shutdown set for any net shutdown is in progress just return */
 566                                 if (net->gnn_shutdown) {
 567                                         up_read(&kgnilnd_data.kgn_net_rw_sem);
 568                                         return;
 569                                 }
 570                                 nnets++;
 571                         }
 572                 }
 573
 574                 if (nnets == 0) {
 575                         /* shutdown in progress most likely */
 576                         up_read(&kgnilnd_data.kgn_net_rw_sem);
 577                         return;
 578                 }
 579
 580                 LIBCFS_ALLOC(nets, nnets * sizeof(*nets));
 581
 582                 if (nets == NULL) {
 583                         up_read(&kgnilnd_data.kgn_net_rw_sem);
 584                         CERROR("Failed to allocate nets[%d]\n", nnets);
 585                         return;
 586                 }
 587
 588                 j = 0;
 589                 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
 590                         list_for_each_entry(net, &kgnilnd_data.kgn_nets[i], gnn_list) {
 591                                 nets[j] = net;
 592                                 kgnilnd_net_addref(net);
 593                                 j++;
 594                         }
 595                 }
 596                 up_read(&kgnilnd_data.kgn_net_rw_sem);
 597
 598                 for (i = 0; i < nnets; i++) {
 599                         lnet_nid_t peer_nid;
 600
 601                         net = nets[i];
 602
 603                         peer_nid = kgnilnd_lnd2lnetnid(net->gnn_ni->ni_nid,
 604                                                                  peer->gnp_nid);
 605
 606                         CDEBUG(D_NET, "peer 0x%p->%s last_alive %lld (%llds ago)\n",
 607                                 peer, libcfs_nid2str(peer_nid), peer->gnp_last_alive,
 608                                 ktime_get_seconds() - peer->gnp_last_alive);
 609
 610                         lnet_notify(net->gnn_ni, peer_nid, alive,
 611                                     peer->gnp_last_alive);
 612
 613                         kgnilnd_net_decref(net);
 614                 }
 615
 616                 LIBCFS_FREE(nets, nnets * sizeof(*nets));
 617         }
 618 }
 619
 620 /* need write_lock on kgn_peer_conn_lock */
 621 void
 622 kgnilnd_close_conn_locked(kgn_conn_t *conn, int error)
 623 {
 624         kgn_peer_t        *peer = conn->gnc_peer;
 625         ENTRY;
 626
 627         LASSERT(!in_interrupt());
 628
 629         /* store error for tx completion */
 630         conn->gnc_error = error;
 631         peer->gnp_last_errno = error;
 632
 633         /* use real error from peer if possible */
 634         if (error == -ECONNRESET) {
 635                 error = conn->gnc_peer_error;
 636         }
 637
 638         /* if we NETERROR, make sure it is rate limited */
 639         if (!kgnilnd_conn_clean_errno(error) &&
 640             peer->gnp_state != GNILND_PEER_DOWN) {
 641                 CNETERR("closing conn to %s: error %d\n",
 642                        libcfs_nid2str(peer->gnp_nid), error);
 643         } else {
 644                 CDEBUG(D_NET, "closing conn to %s: error %d\n",
 645                        libcfs_nid2str(peer->gnp_nid), error);
 646         }
 647
 648         LASSERTF(conn->gnc_state == GNILND_CONN_ESTABLISHED,
 649                 "conn %p to %s with bogus state %s\n", conn,
 650                 libcfs_nid2str(conn->gnc_peer->gnp_nid),
 651                 kgnilnd_conn_state2str(conn));
 652         LASSERT(!list_empty(&conn->gnc_hashlist));
 653         LASSERT(!list_empty(&conn->gnc_list));
 654
 655
 656         /* mark peer count here so any place the EP gets destroyed will
 657          * open up the peer count so that a new ESTABLISHED conn is then free
 658          * to send new messages -- sending before the previous EPs are destroyed
 659          * could end up with messages on the network for the old conn _after_
 660          * the new conn and break the mbox safety protocol */
 661         kgnilnd_admin_addref(conn->gnc_peer->gnp_dirty_eps);
 662
 663         /* Remove from conn hash table: no new callbacks */
 664         list_del_init(&conn->gnc_hashlist);
 665         kgnilnd_data.kgn_conn_version++;
 666         kgnilnd_conn_decref(conn);
 667
 668         /* if we are in reset, go right to CLOSED as there is no scheduler
 669          * thread to move from CLOSING to CLOSED */
 670         if (unlikely(kgnilnd_data.kgn_in_reset)) {
 671                 conn->gnc_state = GNILND_CONN_CLOSED;
 672         } else {
 673                 conn->gnc_state = GNILND_CONN_CLOSING;
 674         }
 675
 676         if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RDMA_CQ_ERROR)) {
 677                 msleep_interruptible(MSEC_PER_SEC);
 678         }
 679
 680         /* leave on peer->gnp_conns to make sure we don't let the reaper
 681          * or others try to unlink this peer until the conn is fully
 682          * processed for closing */
 683
 684         if (kgnilnd_check_purgatory_conn(conn)) {
 685                 kgnilnd_add_purgatory_locked(conn, conn->gnc_peer);
 686         }
 687
 688         /* Reset RX timeout to ensure we wait for an incoming CLOSE
 689          * for the full timeout.  If we get a CLOSE we know the
 690          * peer has stopped all RDMA.  Otherwise if we wait for
 691          * the full timeout we can also be sure all RDMA has stopped. */
 692         conn->gnc_last_rx = conn->gnc_last_rx_cq = jiffies;
 693         mb();
 694
 695         /* schedule sending CLOSE - if we are in quiesce, this adds to
 696          * gnd_ready_conns and allows us to find it in quiesce processing */
 697         kgnilnd_schedule_conn(conn);
 698
 699         EXIT;
 700 }
 701
 702 void
 703 kgnilnd_close_conn(kgn_conn_t *conn, int error)
 704 {
 705         write_lock(&kgnilnd_data.kgn_peer_conn_lock);
 706         /* need to check the state here - this call is racy and we don't
 707          * know the state until after the lock is grabbed */
 708         if (conn->gnc_state == GNILND_CONN_ESTABLISHED) {
 709                 kgnilnd_close_conn_locked(conn, error);
 710         }
 711         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
 712 }
 713
 714 void
 715 kgnilnd_complete_closed_conn(kgn_conn_t *conn)
 716 {
 717         LIST_HEAD               (sinners);
 718         kgn_tx_t               *tx, *txn;
 719         int                     nlive = 0;
 720         int                     nrdma = 0;
 721         int                     nq_rdma = 0;
 722         int                     logmsg;
 723         ENTRY;
 724
 725         /* Dump log  on cksum error - wait until complete phase to let
 726          * RX of error happen */
 727         if (*kgnilnd_tunables.kgn_checksum_dump &&
 728             (conn != NULL && conn->gnc_peer_error == -ENOKEY)) {
 729                 libcfs_debug_dumplog();
 730         }
 731
 732         /* _CLOSED set in kgnilnd_process_fmaq once we decide to
 733          * send the CLOSE or not */
 734         LASSERTF(conn->gnc_state == GNILND_CONN_CLOSED,
 735                  "conn 0x%p->%s with bad state %s\n",
 736                  conn, conn->gnc_peer ?
 737                         libcfs_nid2str(conn->gnc_peer->gnp_nid) :
 738                         "<?>",
 739                  kgnilnd_conn_state2str(conn));
 740
 741         LASSERT(list_empty(&conn->gnc_hashlist));
 742         /* We shouldnt be on the delay list, the conn can
 743          * get added to this list during a retransmit, and retransmits
 744          * only occur within scheduler threads.
 745          */
 746         LASSERT(list_empty(&conn->gnc_delaylist));
 747
 748         /* we've sent the close, start nuking */
 749         if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SCHEDULE_COMPLETE))
 750                 kgnilnd_schedule_conn(conn);
 751
 752         if (conn->gnc_scheduled != GNILND_CONN_PROCESS) {
 753                 CDEBUG(D_NETERROR, "Error someone scheduled us after we were "
 754                                 "done, Attempting to recover conn 0x%p "
 755                                 "scheduled %d function: %s line: %d\n", conn,
 756                                 conn->gnc_scheduled, conn->gnc_sched_caller,
 757                                 conn->gnc_sched_line);
 758                 RETURN_EXIT;
 759         }
 760
 761         /* we don't use lists to track things that we can get out of the
 762          * tx_ref table... */
 763
 764         /* need to hold locks for tx_list_state, sampling it is too racy:
 765          * - the lock actually protects tx != NULL, but we can't take the proper
 766          *   lock until we check tx_list_state, which would be too late and
 767          *   we could have the TX change under us.
 768          * gnd_rdmaq_lock and gnd_lock and not used together, so taking both
 769          * should be fine */
 770         spin_lock(&conn->gnc_device->gnd_rdmaq_lock);
 771         spin_lock(&conn->gnc_device->gnd_lock);
 772
 773         for (nrdma = 0; nrdma < GNILND_MAX_MSG_ID; nrdma++) {
 774                 tx = conn->gnc_tx_ref_table[nrdma];
 775
 776                 if (tx != NULL) {
 777                         /* only print the first error and if not CLOSE, we often don't see
 778                          * CQ events for that by the time we get here... and really don't care */
 779                         if (nlive || tx->tx_msg.gnm_type == GNILND_MSG_CLOSE)
 780                                 tx->tx_state |= GNILND_TX_QUIET_ERROR;
 781                         nlive++;
 782                         GNIDBG_TX(D_NET, tx, "cleaning up on close, nlive %d", nlive);
 783
 784                         /* don't worry about gnc_lock here as nobody else should be
 785                          * touching this conn */
 786                         kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
 787                         list_add_tail(&tx->tx_list, &sinners);
 788                 }
 789         }
 790         spin_unlock(&conn->gnc_device->gnd_lock);
 791         spin_unlock(&conn->gnc_device->gnd_rdmaq_lock);
 792
 793         /* nobody should have marked this as needing scheduling after
 794          * we called close - so only ref should be us handling it */
 795         if (conn->gnc_scheduled != GNILND_CONN_PROCESS) {
 796                 CDEBUG(D_NETERROR, "Error someone scheduled us after we were "
 797                                 "done, Attempting to recover conn 0x%p "
 798                                 "scheduled %d function %s line: %d\n", conn,
 799                                 conn->gnc_scheduled, conn->gnc_sched_caller,
 800                                 conn->gnc_sched_line);
 801         }
 802         /* now reset a few to actual counters... */
 803         nrdma = atomic_read(&conn->gnc_nlive_rdma);
 804         nq_rdma = atomic_read(&conn->gnc_nq_rdma);
 805
 806         if (!list_empty(&sinners)) {
 807                 list_for_each_entry_safe(tx, txn, &sinners, tx_list) {
 808                         /* clear tx_list to make tx_add_list_locked happy */
 809                         list_del_init(&tx->tx_list);
 810                         /* The error codes determine if we hold onto the MDD */
 811                         kgnilnd_tx_done(tx, conn->gnc_error);
 812                 }
 813         }
 814
 815         logmsg = (nlive + nrdma + nq_rdma);
 816
 817         if (logmsg) {
 818                 int level = conn->gnc_peer->gnp_state == GNILND_PEER_UP ?
 819                                 D_NETERROR : D_NET;
 820                 CDEBUG(level, "Closed conn 0x%p->%s (errno %d,"
 821                         " peer errno %d): canceled %d TX, %d/%d RDMA\n",
 822                         conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
 823                         conn->gnc_error, conn->gnc_peer_error,
 824                         nlive, nq_rdma, nrdma);
 825         }
 826
 827         kgnilnd_destroy_conn_ep(conn);
 828
 829         /* Bug 765042 - race this with completing a new conn to same peer - we need
 830          * finish_connect to detach purgatory before we can do it ourselves here */
 831         CFS_RACE(CFS_FAIL_GNI_FINISH_PURG);
 832
 833         /* now it is safe to remove from peer list - anyone looking at
 834          * gnp_conns now is free to unlink if not on purgatory */
 835         write_lock(&kgnilnd_data.kgn_peer_conn_lock);
 836
 837         conn->gnc_state = GNILND_CONN_DONE;
 838
 839         /* Decrement counter if we are marked by del_conn_or_peers for closing
 840          */
 841         if (conn->gnc_needs_closing)
 842                 kgnilnd_admin_decref(kgnilnd_data.kgn_npending_conns);
 843
 844         /* Remove from peer's list of valid connections if its not in purgatory */
 845         if (!conn->gnc_in_purgatory) {
 846                 list_del_init(&conn->gnc_list);
 847                 /* Lose peers reference on the conn */
 848                 kgnilnd_conn_decref(conn);
 849         }
 850
 851         /* NB - only unlinking if we set pending in del_peer_locked from admin or
 852          * shutdown */
 853         if (kgnilnd_peer_active(conn->gnc_peer) &&
 854             conn->gnc_peer->gnp_pending_unlink &&
 855             kgnilnd_can_unlink_peer_locked(conn->gnc_peer)) {
 856                 kgnilnd_unlink_peer_locked(conn->gnc_peer);
 857         }
 858
 859         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
 860
 861         /* I'm telling Mommy! - use peer_error if they initiated close */
 862         kgnilnd_peer_notify(conn->gnc_peer,
 863                             conn->gnc_error == -ECONNRESET ?
 864                             conn->gnc_peer_error : conn->gnc_error, 0);
 865
 866         EXIT;
 867 }
 868
 869 int
 870 kgnilnd_set_conn_params(kgn_dgram_t *dgram)
 871 {
 872         kgn_conn_t             *conn = dgram->gndg_conn;
 873         kgn_connreq_t          *connreq = &dgram->gndg_conn_in;
 874         kgn_gniparams_t        *rem_param = &connreq->gncr_gnparams;
 875         gni_return_t            rrc;
 876         int                     rc = 0;
 877         gni_smsg_attr_t        *remote = &connreq->gncr_gnparams.gnpr_smsg_attr;
 878
 879         /* set timeout vals in conn early so we can use them for the NAK */
 880
 881         /* use max of the requested and our timeout, peer will do the same */
 882         conn->gnc_timeout = MAX(conn->gnc_timeout, connreq->gncr_timeout);
 883
 884         /* only ep_bind really mucks around with the CQ */
 885         /* only ep bind if we are not connecting to ourself and the dstnid is not a wildcard. this check
 886          * is necessary as you can only bind an ep once and we must make sure we dont bind when already bound.
 887          */
 888         if (connreq->gncr_dstnid != LNET_NID_ANY && dgram->gndg_conn_out.gncr_dstnid != connreq->gncr_srcnid) {
 889                 mutex_lock(&conn->gnc_device->gnd_cq_mutex);
 890                 rrc = kgnilnd_ep_bind(conn->gnc_ephandle,
 891                         connreq->gncr_gnparams.gnpr_host_id,
 892                         conn->gnc_cqid);
 893                 mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
 894                 if (rrc != GNI_RC_SUCCESS) {
 895                         rc = -ECONNABORTED;
 896                         goto return_out;
 897                 }
 898         }
 899
 900         rrc = kgnilnd_ep_set_eventdata(conn->gnc_ephandle, conn->gnc_cqid,
 901                          connreq->gncr_gnparams.gnpr_cqid);
 902         if (rrc != GNI_RC_SUCCESS) {
 903                 rc = -ECONNABORTED;
 904                 goto cleanup_out;
 905         }
 906
 907         /* Initialize SMSG */
 908         rrc = kgnilnd_smsg_init(conn->gnc_ephandle, &conn->gnpr_smsg_attr,
 909                         &connreq->gncr_gnparams.gnpr_smsg_attr);
 910         if (unlikely(rrc == GNI_RC_INVALID_PARAM)) {
 911                 gni_smsg_attr_t *local = &conn->gnpr_smsg_attr;
 912                 /* help folks figure out if there is a tunable off, etc. */
 913                 LCONSOLE_ERROR("SMSG attribute mismatch. Data from local/remote:"
 914                                " type %d/%d msg_maxsize %u/%u"
 915                                " mbox_maxcredit %u/%u. Please check kgni"
 916                                " logs for further data\n",
 917                                local->msg_type, remote->msg_type,
 918                                local->msg_maxsize, remote->msg_maxsize,
 919                                local->mbox_maxcredit, remote->mbox_maxcredit);
 920         }
 921         if (rrc != GNI_RC_SUCCESS) {
 922                 rc = -ECONNABORTED;
 923                 goto cleanup_out;
 924         }
 925
 926         /* log this for help in debuggin SMSG buffer re-use */
 927         CDEBUG(D_NET, "conn %p src %s dst %s smsg %p acquired"
 928                 " local cqid %u SMSG %p->%u hndl %#llx.%#llx"
 929                 " remote cqid %u SMSG %p->%u hndl %#llx.%#llx\n",
 930                 conn, libcfs_nid2str(connreq->gncr_srcnid),
 931                 libcfs_nid2str(connreq->gncr_dstnid),
 932                 &conn->gnpr_smsg_attr,
 933                 conn->gnc_cqid,
 934                 conn->gnpr_smsg_attr.msg_buffer,
 935                 conn->gnpr_smsg_attr.mbox_offset,
 936                 conn->gnpr_smsg_attr.mem_hndl.qword1,
 937                 conn->gnpr_smsg_attr.mem_hndl.qword2,
 938                 rem_param->gnpr_cqid,
 939                 rem_param->gnpr_smsg_attr.msg_buffer,
 940                 rem_param->gnpr_smsg_attr.mbox_offset,
 941                 rem_param->gnpr_smsg_attr.mem_hndl.qword1,
 942                 rem_param->gnpr_smsg_attr.mem_hndl.qword2);
 943
 944         conn->gnc_peerstamp = connreq->gncr_peerstamp;
 945         conn->gnc_peer_connstamp = connreq->gncr_connstamp;
 946         conn->remote_mbox_addr = (void *)((char *)remote->msg_buffer + remote->mbox_offset);
 947
 948         /* We update the reaper timeout once we have a valid conn and timeout */
 949         kgnilnd_update_reaper_timeout(GNILND_TO2KA(conn->gnc_timeout));
 950
 951         return 0;
 952
 953 cleanup_out:
 954         rrc = kgnilnd_ep_unbind(conn->gnc_ephandle);
 955         /* not sure I can just let this fly */
 956         LASSERTF(rrc == GNI_RC_SUCCESS,
 957                 "bad rc from gni_ep_unbind trying to cleanup: %d\n", rrc);
 958
 959 return_out:
 960         LASSERTF(rc != 0, "SOFTWARE BUG: rc == 0\n");
 961         CERROR("Error setting connection params from %s: %d\n",
 962                libcfs_nid2str(connreq->gncr_srcnid), rc);
 963         return rc;
 964 }
 965
 966 /* needs down_read on kgn_net_rw_sem held from before this call until
 967  * after the write_lock on kgn_peer_conn_lock - this ensures we stay sane
 968  * with kgnilnd_shutdown - it'll get the sem and set shutdown, then get the
 969  * kgn_peer_conn_lock to start del_peer'ing. If we hold the sem until after
 970  * kgn_peer_conn_lock is held, we guarantee that nobody calls
 971  * kgnilnd_add_peer_locked without checking gnn_shutdown */
 972 int
 973 kgnilnd_create_peer_safe(kgn_peer_t **peerp,
 974                          lnet_nid_t nid,
 975                          kgn_net_t *net,
 976                          int node_state)
 977 {
 978         kgn_peer_t      *peer;
 979         int             rc;
 980
 981         LASSERT(nid != LNET_NID_ANY);
 982
 983         /* We dont pass the net around in the dgram anymore so here is where we find it
 984          * this will work unless its in shutdown or the nid has a net that is invalid.
 985          * Either way error code needs to be returned in that case.
 986          *
 987          * If the net passed in is not NULL then we can use it, this alleviates looking it
 988          * when the calling function has access to the data.
 989          */
 990         if (net == NULL) {
 991                 rc = kgnilnd_find_net(nid, &net);
 992                 if (rc < 0)
 993                         return rc;
 994         } else {
 995                 /* find net adds a reference on the net if we are not using
 996                  * it we must do it manually so the net references are
 997                  * correct when tearing down the net
 998                  */
 999                 kgnilnd_net_addref(net);
1000         }
1001
1002         LIBCFS_ALLOC(peer, sizeof(*peer));
1003         if (peer == NULL) {
1004                 kgnilnd_net_decref(net);
1005                 return -ENOMEM;
1006         }
1007         peer->gnp_nid = nid;
1008         peer->gnp_state = node_state;
1009
1010         /* translate from nid to nic addr & store */
1011         rc = kgnilnd_nid_to_nicaddrs(LNET_NIDADDR(nid), 1, &peer->gnp_host_id);
1012         if (rc <= 0) {
1013                 kgnilnd_net_decref(net);
1014                 LIBCFS_FREE(peer, sizeof(*peer));
1015                 return -ESRCH;
1016         }
1017         CDEBUG(D_NET, "peer 0x%p->%s -> NIC 0x%x\n", peer,
1018                 libcfs_nid2str(nid), peer->gnp_host_id);
1019
1020         atomic_set(&peer->gnp_refcount, 1);     /* 1 ref for caller */
1021         atomic_set(&peer->gnp_dirty_eps, 0);
1022
1023         INIT_LIST_HEAD(&peer->gnp_list);
1024         INIT_LIST_HEAD(&peer->gnp_connd_list);
1025         INIT_LIST_HEAD(&peer->gnp_conns);
1026         INIT_LIST_HEAD(&peer->gnp_tx_queue);
1027
1028         /* the first reconnect should happen immediately, so we leave
1029          * gnp_reconnect_interval set to 0 */
1030
1031         LASSERTF(net != NULL, "peer 0x%p->%s with NULL net\n",
1032                  peer, libcfs_nid2str(nid));
1033
1034         /* must have kgn_net_rw_sem held for this...  */
1035         if (net->gnn_shutdown) {
1036                 /* shutdown has started already */
1037                 kgnilnd_net_decref(net);
1038                 LIBCFS_FREE(peer, sizeof(*peer));
1039                 return -ESHUTDOWN;
1040         }
1041
1042         peer->gnp_net = net;
1043
1044         atomic_inc(&kgnilnd_data.kgn_npeers);
1045
1046         *peerp = peer;
1047         return 0;
1048 }
1049
1050 void
1051 kgnilnd_destroy_peer(kgn_peer_t *peer)
1052 {
1053         CDEBUG(D_NET, "peer %s %p deleted\n",
1054                libcfs_nid2str(peer->gnp_nid), peer);
1055         LASSERTF(atomic_read(&peer->gnp_refcount) == 0,
1056                  "peer 0x%p->%s refs %d\n",
1057                  peer, libcfs_nid2str(peer->gnp_nid),
1058                  atomic_read(&peer->gnp_refcount));
1059         LASSERTF(atomic_read(&peer->gnp_dirty_eps) == 0,
1060                  "peer 0x%p->%s dirty eps %d\n",
1061                  peer, libcfs_nid2str(peer->gnp_nid),
1062                  atomic_read(&peer->gnp_dirty_eps));
1063         LASSERTF(peer->gnp_net != NULL, "peer %p (%s) with NULL net\n",
1064                  peer, libcfs_nid2str(peer->gnp_nid));
1065         LASSERTF(!kgnilnd_peer_active(peer),
1066                  "peer 0x%p->%s\n",
1067                 peer, libcfs_nid2str(peer->gnp_nid));
1068         LASSERTF(peer->gnp_connecting == GNILND_PEER_IDLE || peer->gnp_connecting == GNILND_PEER_KILL,
1069                  "peer 0x%p->%s, connecting %d\n",
1070                 peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting);
1071         LASSERTF(list_empty(&peer->gnp_conns),
1072                  "peer 0x%p->%s\n",
1073                 peer, libcfs_nid2str(peer->gnp_nid));
1074         LASSERTF(list_empty(&peer->gnp_tx_queue),
1075                  "peer 0x%p->%s\n",
1076                 peer, libcfs_nid2str(peer->gnp_nid));
1077         LASSERTF(list_empty(&peer->gnp_connd_list),
1078                  "peer 0x%p->%s\n",
1079                 peer, libcfs_nid2str(peer->gnp_nid));
1080
1081         /* NB a peer's connections keep a reference on their peer until
1082          * they are destroyed, so we can be assured that _all_ state to do
1083          * with this peer has been cleaned up when its refcount drops to
1084          * zero. */
1085
1086         atomic_dec(&kgnilnd_data.kgn_npeers);
1087         kgnilnd_net_decref(peer->gnp_net);
1088
1089         LIBCFS_FREE(peer, sizeof(*peer));
1090 }
1091
1092 /* the conn might not have made it all the way through to a connected
1093  * state - but we need to purgatory any conn that a remote peer might
1094  * have seen through a posted dgram as well */
1095 void
1096 kgnilnd_add_purgatory_locked(kgn_conn_t *conn, kgn_peer_t *peer)
1097 {
1098         kgn_mbox_info_t *mbox = NULL;
1099         ENTRY;
1100
1101         /* NB - the caller should own conn by removing him from the
1102          * scheduler thread when finishing the close */
1103
1104         LASSERTF(peer != NULL, "conn %p with NULL peer\n", conn);
1105
1106         /* If this is still true, need to add the calls to unlink back in and
1107          * figure out how to close the hole on loopback conns */
1108         LASSERTF(kgnilnd_peer_active(peer), "can't use inactive peer %s (%p)"
1109                 " we'll never recover the resources\n",
1110                 libcfs_nid2str(peer->gnp_nid), peer);
1111
1112         CDEBUG(D_NET, "conn %p peer %p dev %p\n", conn, peer,
1113                 conn->gnc_device);
1114
1115         LASSERTF(conn->gnc_in_purgatory == 0,
1116                 "Conn already in purgatory\n");
1117         conn->gnc_in_purgatory = 1;
1118
1119         mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
1120         mbox->mbx_prev_purg_nid = peer->gnp_nid;
1121         mbox->mbx_add_purgatory = jiffies;
1122         kgnilnd_release_mbox(conn, 1);
1123
1124         LASSERTF(list_empty(&conn->gnc_mdd_list),
1125                 "conn 0x%p->%s with active purgatory hold MDD %d\n",
1126                 conn, libcfs_nid2str(peer->gnp_nid),
1127                 kgnilnd_count_list(&conn->gnc_mdd_list));
1128
1129         EXIT;
1130 }
1131
1132 /* Instead of detaching everything from purgatory here we just mark the conn as needing
1133  * detach, when the reaper checks the conn the next time it will detach it.
1134  * Calling function requires write_lock held on kgn_peer_conn_lock
1135  */
1136 void
1137 kgnilnd_mark_for_detach_purgatory_all_locked(kgn_peer_t *peer) {
1138         kgn_conn_t       *conn;
1139
1140         list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
1141                 if (conn->gnc_in_purgatory && !conn->gnc_needs_detach) {
1142                         conn->gnc_needs_detach = 1;
1143                         kgnilnd_admin_addref(kgnilnd_data.kgn_npending_detach);
1144                 }
1145         }
1146 }
1147
1148 /* Calling function needs a write_lock held on kgn_peer_conn_lock */
1149 void
1150 kgnilnd_detach_purgatory_locked(kgn_conn_t *conn, struct list_head *conn_list)
1151 {
1152         kgn_mbox_info_t *mbox = NULL;
1153
1154         /* if needed, add the conn purgatory data to the list passed in */
1155         if (conn->gnc_in_purgatory) {
1156                 CDEBUG(D_NET, "peer %p->%s purg_conn %p@%s mdd_list #tx %d\n",
1157                         conn->gnc_peer, libcfs_nid2str(conn->gnc_peer->gnp_nid),
1158                         conn, kgnilnd_conn_state2str(conn),
1159                         kgnilnd_count_list(&conn->gnc_mdd_list));
1160
1161                 mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
1162                 mbox->mbx_detach_of_purgatory = jiffies;
1163
1164                 /* conn->gnc_list is the entry point on peer->gnp_conns, so detaching it
1165                  * here removes it from the list of 'valid' peer connections.
1166                  * We put the current conn onto a list of conns to call kgnilnd_release_purgatory_locked()
1167                  * and as such the caller of kgnilnd_detach_purgatory_locked() now owns that conn, since its not
1168                  * on the peer's conn_list anymore.
1169                  */
1170
1171                 list_del_init(&conn->gnc_list);
1172
1173                 /* NB - only unlinking if we set pending in del_peer_locked from admin or
1174                  * shutdown */
1175                 if (kgnilnd_peer_active(conn->gnc_peer) &&
1176                     conn->gnc_peer->gnp_pending_unlink &&
1177                     kgnilnd_can_unlink_peer_locked(conn->gnc_peer)) {
1178                         kgnilnd_unlink_peer_locked(conn->gnc_peer);
1179                 }
1180                 /* The reaper will not call detach unless the conn is fully through kgnilnd_complete_closed_conn.
1181                  * If the conn is not in a DONE state somehow we are attempting to detach even though
1182                  * the conn has not been fully cleaned up. If we detach while the conn is still closing
1183                  * we will end up with an orphaned connection that has valid ep_handle, that is not on a
1184                  * peer.
1185                  */
1186
1187                 LASSERTF(conn->gnc_state == GNILND_CONN_DONE, "Conn in invalid state  %p@%s \n",
1188                                 conn, kgnilnd_conn_state2str(conn));
1189
1190                 /* move from peer to the delayed release list */
1191                 list_add_tail(&conn->gnc_list, conn_list);
1192         }
1193 }
1194
1195 void
1196 kgnilnd_release_purgatory_list(struct list_head *conn_list)
1197 {
1198         kgn_device_t            *dev;
1199         kgn_conn_t              *conn, *connN;
1200         kgn_mdd_purgatory_t     *gmp, *gmpN;
1201
1202         list_for_each_entry_safe(conn, connN, conn_list, gnc_list) {
1203                 dev = conn->gnc_device;
1204
1205                 kgnilnd_release_mbox(conn, -1);
1206                 conn->gnc_in_purgatory = 0;
1207
1208                 list_del_init(&conn->gnc_list);
1209
1210                 /* gnc_needs_detach is set in kgnilnd_del_conn_or_peer. It is used to keep track
1211                  * of conns that have been marked for detach by kgnilnd_del_conn_or_peer.
1212                  * The function uses kgn_npending_detach to verify the conn has
1213                  * actually been detached.
1214                  */
1215
1216                 if (conn->gnc_needs_detach)
1217                         kgnilnd_admin_decref(kgnilnd_data.kgn_npending_detach);
1218
1219                 /* if this guy is really dead (we are doing release from reaper),
1220                  * make sure we tell LNet - if this is from other context,
1221                  * the checks in the function will prevent an errant
1222                  * notification */
1223                 kgnilnd_peer_notify(conn->gnc_peer, conn->gnc_error, 0);
1224
1225                 list_for_each_entry_safe(gmp, gmpN, &conn->gnc_mdd_list,
1226                                          gmp_list) {
1227                         CDEBUG(D_NET,
1228                                "dev %p releasing held mdd %#llx.%#llx\n",
1229                                conn->gnc_device, gmp->gmp_map_key.qword1,
1230                                gmp->gmp_map_key.qword2);
1231
1232                         atomic_dec(&dev->gnd_n_mdd_held);
1233                         kgnilnd_mem_mdd_release(conn->gnc_device->gnd_handle,
1234                                                 &gmp->gmp_map_key);
1235                         /* ignoring the return code - if kgni/ghal can't find it
1236                          * it must be released already */
1237
1238                         list_del_init(&gmp->gmp_list);
1239                         LIBCFS_FREE(gmp, sizeof(*gmp));
1240                 }
1241                 /* lose conn ref for purgatory */
1242                 kgnilnd_conn_decref(conn);
1243         }
1244 }
1245
1246 /* needs write_lock on kgnilnd_data.kgn_peer_conn_lock held */
1247 void
1248 kgnilnd_peer_increase_reconnect_locked(kgn_peer_t *peer)
1249 {
1250         int current_to;
1251
1252         current_to = peer->gnp_reconnect_interval;
1253
1254         /* we'll try to reconnect fast the first time, then back-off */
1255         if (current_to == 0) {
1256                 peer->gnp_reconnect_time = jiffies - 1;
1257                 current_to = *kgnilnd_tunables.kgn_min_reconnect_interval;
1258         } else {
1259                 peer->gnp_reconnect_time = jiffies + cfs_time_seconds(current_to);
1260                 /* add 50% of min timeout & retry */
1261                 current_to += *kgnilnd_tunables.kgn_min_reconnect_interval / 2;
1262         }
1263
1264         current_to = MIN(current_to,
1265                                 *kgnilnd_tunables.kgn_max_reconnect_interval);
1266
1267         peer->gnp_reconnect_interval = current_to;
1268         CDEBUG(D_NET, "peer %s can reconnect at %lu interval %lu\n",
1269                libcfs_nid2str(peer->gnp_nid), peer->gnp_reconnect_time,
1270                peer->gnp_reconnect_interval);
1271 }
1272
1273 /* needs kgnilnd_data.kgn_peer_conn_lock held */
1274 kgn_peer_t *
1275 kgnilnd_find_peer_locked(lnet_nid_t nid)
1276 {
1277         struct list_head *peer_list = kgnilnd_nid2peerlist(nid);
1278         kgn_peer_t       *peer;
1279
1280         /* Chopping nid down to only NIDADDR using LNET_NIDADDR so we only
1281          * have a single peer per device instead of a peer per nid/net combo.
1282          */
1283
1284         list_for_each_entry(peer, peer_list, gnp_list) {
1285                 if (LNET_NIDADDR(nid) != LNET_NIDADDR(peer->gnp_nid))
1286                         continue;
1287
1288                 CDEBUG(D_NET, "got peer [%p] -> %s c %d (%d)\n",
1289                        peer, libcfs_nid2str(nid),
1290                        peer->gnp_connecting,
1291                        atomic_read(&peer->gnp_refcount));
1292                 return peer;
1293         }
1294         return NULL;
1295 }
1296
1297 /* need write_lock on kgn_peer_conn_lock */
1298 void
1299 kgnilnd_unlink_peer_locked(kgn_peer_t *peer)
1300 {
1301         LASSERTF(list_empty(&peer->gnp_conns),
1302                 "peer 0x%p->%s\n",
1303                  peer, libcfs_nid2str(peer->gnp_nid));
1304         LASSERTF(list_empty(&peer->gnp_tx_queue),
1305                 "peer 0x%p->%s\n",
1306                  peer, libcfs_nid2str(peer->gnp_nid));
1307         LASSERTF(kgnilnd_peer_active(peer),
1308                 "peer 0x%p->%s\n",
1309                  peer, libcfs_nid2str(peer->gnp_nid));
1310         CDEBUG(D_NET, "unlinking peer 0x%p->%s\n",
1311                 peer, libcfs_nid2str(peer->gnp_nid));
1312
1313         list_del_init(&peer->gnp_list);
1314         kgnilnd_data.kgn_peer_version++;
1315         kgnilnd_admin_decref(kgnilnd_data.kgn_npending_unlink);
1316         /* lose peerlist's ref */
1317         kgnilnd_peer_decref(peer);
1318 }
1319
1320 int
1321 kgnilnd_get_peer_info(int index,
1322                       kgn_peer_t **found_peer,
1323                       lnet_nid_t *id, __u32 *nic_addr,
1324                       int *refcount, int *connecting)
1325 {
1326         struct list_head  *ptmp;
1327         kgn_peer_t        *peer;
1328         int               i;
1329         int               rc = -ENOENT;
1330
1331         read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1332
1333         for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
1334
1335                 list_for_each(ptmp, &kgnilnd_data.kgn_peers[i]) {
1336                         peer = list_entry(ptmp, kgn_peer_t, gnp_list);
1337
1338                         if (index-- > 0)
1339                                 continue;
1340
1341                         CDEBUG(D_NET, "found peer %p (%s) at index %d\n",
1342                                peer, libcfs_nid2str(peer->gnp_nid), index);
1343
1344                         *found_peer  = peer;
1345                         *id          = peer->gnp_nid;
1346                         *nic_addr    = peer->gnp_host_id;
1347                         *refcount    = atomic_read(&peer->gnp_refcount);
1348                         *connecting  = peer->gnp_connecting;
1349
1350                         rc = 0;
1351                         goto out;
1352                 }
1353         }
1354 out:
1355         read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1356         if (rc)
1357                 CDEBUG(D_NET, "no gni peer at index %d\n", index);
1358         return rc;
1359 }
1360
1361 /* requires write_lock on kgn_peer_conn_lock held */
1362 void
1363 kgnilnd_add_peer_locked(lnet_nid_t nid, kgn_peer_t *new_stub_peer, kgn_peer_t **peerp)
1364 {
1365         kgn_peer_t        *peer, *peer2;
1366
1367         LASSERTF(new_stub_peer != NULL, "bad stub peer for nid %s\n",
1368                  libcfs_nid2str(nid));
1369
1370         peer2 = kgnilnd_find_peer_locked(nid);
1371         if (peer2 != NULL) {
1372                 /* A peer was created during the lock transition, so drop
1373                  * the new one we created */
1374                 kgnilnd_peer_decref(new_stub_peer);
1375                 peer = peer2;
1376         } else {
1377                 peer = new_stub_peer;
1378                 /* peer table takes existing ref on peer */
1379
1380                 LASSERTF(!kgnilnd_peer_active(peer),
1381                         "peer 0x%p->%s already in peer table\n",
1382                         peer, libcfs_nid2str(peer->gnp_nid));
1383                 list_add_tail(&peer->gnp_list,
1384                               kgnilnd_nid2peerlist(nid));
1385                 kgnilnd_data.kgn_peer_version++;
1386         }
1387
1388         LASSERTF(peer->gnp_net != NULL, "peer 0x%p->%s with NULL net\n",
1389                  peer, libcfs_nid2str(peer->gnp_nid));
1390         *peerp = peer;
1391 }
1392
1393 int
1394 kgnilnd_add_peer(kgn_net_t *net, lnet_nid_t nid, kgn_peer_t **peerp)
1395 {
1396         kgn_peer_t        *peer;
1397         int                rc;
1398         int                node_state;
1399         ENTRY;
1400
1401         if (nid == LNET_NID_ANY)
1402                 return -EINVAL;
1403
1404         node_state = kgnilnd_get_node_state(LNET_NIDADDR(nid));
1405
1406         /* NB - this will not block during normal operations -
1407          * the only writer of this is in the startup/shutdown path. */
1408         rc = down_read_trylock(&kgnilnd_data.kgn_net_rw_sem);
1409         if (!rc) {
1410                 rc = -ESHUTDOWN;
1411                 RETURN(rc);
1412         }
1413         rc = kgnilnd_create_peer_safe(&peer, nid, net, node_state);
1414         if (rc != 0) {
1415                 up_read(&kgnilnd_data.kgn_net_rw_sem);
1416                 RETURN(rc);
1417         }
1418
1419         write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1420         up_read(&kgnilnd_data.kgn_net_rw_sem);
1421
1422         kgnilnd_add_peer_locked(nid, peer, peerp);
1423
1424         CDEBUG(D_NET, "peer 0x%p->%s connecting %d\n",
1425                peerp, libcfs_nid2str((*peerp)->gnp_nid),
1426                (*peerp)->gnp_connecting);
1427
1428         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1429         RETURN(0);
1430 }
1431
1432 /* needs write_lock on kgn_peer_conn_lock */
1433 void
1434 kgnilnd_cancel_peer_connect_locked(kgn_peer_t *peer, struct list_head *zombies)
1435 {
1436         kgn_tx_t        *tx, *txn;
1437
1438         /* we do care about state of gnp_connecting - we could be between
1439          * reconnect attempts, so try to find the dgram and cancel the TX
1440          * anyways. If we are in the process of posting DONT do anything;
1441          * once it fails or succeeds we can nuke the connect attempt.
1442          * We have no idea where in kgnilnd_post_dgram we are so we cant
1443          * attempt to cancel until the function is done.
1444          */
1445
1446         /* make sure peer isn't in process of connecting or waiting for connect*/
1447         spin_lock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
1448         if (!(list_empty(&peer->gnp_connd_list))) {
1449                 list_del_init(&peer->gnp_connd_list);
1450                 /* remove connd ref */
1451                 kgnilnd_peer_decref(peer);
1452         }
1453         spin_unlock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
1454
1455         if (peer->gnp_connecting == GNILND_PEER_POSTING || peer->gnp_connecting == GNILND_PEER_NEEDS_DEATH) {
1456                 peer->gnp_connecting = GNILND_PEER_NEEDS_DEATH;
1457                 /* We are in process of posting right now the xchg set it up for us to
1458                  * cancel the connect so we are finished for now */
1459         } else {
1460                 /* no need for exchange we have the peer lock and its ready for us to nuke */
1461                 LASSERTF(peer->gnp_connecting != GNILND_PEER_POSTING,
1462                         "Peer in invalid state 0x%p->%s, connecting %d\n",
1463                         peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting);
1464                 peer->gnp_connecting = GNILND_PEER_IDLE;
1465                 set_mb(peer->gnp_last_dgram_errno, -ETIMEDOUT);
1466                 kgnilnd_find_and_cancel_dgram(peer->gnp_net->gnn_dev,
1467                                                       peer->gnp_nid);
1468         }
1469
1470         /* The least we can do is nuke the tx's no matter what.... */
1471         list_for_each_entry_safe(tx, txn, &peer->gnp_tx_queue, tx_list) {
1472                 kgnilnd_tx_del_state_locked(tx, peer, NULL,
1473                                            GNILND_TX_ALLOCD);
1474                 list_add_tail(&tx->tx_list, zombies);
1475         }
1476 }
1477
1478 /* needs write_lock on kgn_peer_conn_lock */
1479 void
1480 kgnilnd_del_peer_locked(kgn_peer_t *peer, int error)
1481 {
1482         /* this peer could be passive and only held for purgatory,
1483          * take a ref to ensure it doesn't disappear in this function */
1484         kgnilnd_peer_addref(peer);
1485
1486         CFS_RACE(CFS_FAIL_GNI_FIND_TARGET);
1487
1488         /* if purgatory release cleared it out, don't try again */
1489         if (kgnilnd_peer_active(peer)) {
1490                 /* always do this to allow kgnilnd_start_connect and
1491                  * kgnilnd_finish_connect to catch this before they
1492                  * wrap up their operations */
1493                 if (kgnilnd_can_unlink_peer_locked(peer)) {
1494                         /* already released purgatory, so only active
1495                          * conns hold it */
1496                         kgnilnd_unlink_peer_locked(peer);
1497                 } else {
1498                         kgnilnd_close_peer_conns_locked(peer, error);
1499                         /* peer unlinks itself when last conn is closed */
1500                 }
1501         }
1502
1503         /* we are done, release back to the wild */
1504         kgnilnd_peer_decref(peer);
1505 }
1506
1507 int
1508 kgnilnd_del_conn_or_peer(kgn_net_t *net, lnet_nid_t nid, int command,
1509                           int error)
1510 {
1511         LIST_HEAD               (souls);
1512         LIST_HEAD               (zombies);
1513         struct list_head        *ptmp, *pnxt;
1514         kgn_peer_t              *peer;
1515         int                     lo;
1516         int                     hi;
1517         int                     i;
1518         int                     rc = -ENOENT;
1519
1520         write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1521
1522         if (nid != LNET_NID_ANY)
1523                 lo = hi = kgnilnd_nid2peerlist(nid) - kgnilnd_data.kgn_peers;
1524         else {
1525                 lo = 0;
1526                 hi = *kgnilnd_tunables.kgn_peer_hash_size - 1;
1527                 /* wildcards always succeed */
1528                 rc = 0;
1529         }
1530
1531         for (i = lo; i <= hi; i++) {
1532                 list_for_each_safe(ptmp, pnxt, &kgnilnd_data.kgn_peers[i]) {
1533                         peer = list_entry(ptmp, kgn_peer_t, gnp_list);
1534
1535                         LASSERTF(peer->gnp_net != NULL,
1536                                 "peer %p (%s) with NULL net\n",
1537                                  peer, libcfs_nid2str(peer->gnp_nid));
1538
1539                         if (net != NULL && peer->gnp_net != net)
1540                                 continue;
1541
1542                         if (!(nid == LNET_NID_ANY || LNET_NIDADDR(peer->gnp_nid) == LNET_NIDADDR(nid)))
1543                                 continue;
1544
1545                         /* In both cases, we want to stop any in-flight
1546                          * connect attempts */
1547                         kgnilnd_cancel_peer_connect_locked(peer, &zombies);
1548
1549                         switch (command) {
1550                         case GNILND_DEL_CONN:
1551                                 kgnilnd_close_peer_conns_locked(peer, error);
1552                                 break;
1553                         case GNILND_DEL_PEER:
1554                                 peer->gnp_pending_unlink = 1;
1555                                 kgnilnd_admin_addref(kgnilnd_data.kgn_npending_unlink);
1556                                 kgnilnd_mark_for_detach_purgatory_all_locked(peer);
1557                                 kgnilnd_del_peer_locked(peer, error);
1558                                 break;
1559                         case GNILND_CLEAR_PURGATORY:
1560                                 /* Mark everything ready for detach reaper will cleanup
1561                                  * once we release the kgn_peer_conn_lock
1562                                  */
1563                                 kgnilnd_mark_for_detach_purgatory_all_locked(peer);
1564                                 peer->gnp_last_errno = -EISCONN;
1565                                 /* clear reconnect so he can reconnect soon */
1566                                 peer->gnp_reconnect_time = 0;
1567                                 peer->gnp_reconnect_interval = 0;
1568                                 break;
1569                         default:
1570                                 CERROR("bad command %d\n", command);
1571                                 LBUG();
1572                         }
1573                         /* we matched something */
1574                         rc = 0;
1575                 }
1576         }
1577
1578         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1579
1580         /* nuke peer TX */
1581         kgnilnd_txlist_done(&zombies, error);
1582
1583         /* This function does not return until the commands it initiated have completed,
1584          * since they have to work there way through the other threads. In the case of shutdown
1585          * threads are not woken up until after this call is initiated so we cannot wait, we just
1586          * need to return. The same applies for stack reset we shouldnt wait as the reset thread
1587          * handles closing.
1588          */
1589
1590         CFS_RACE(CFS_FAIL_GNI_RACE_RESET);
1591
1592         if (error == -ENOTRECOVERABLE || error == -ESHUTDOWN) {
1593                 return rc;
1594         }
1595
1596         i = 4;
1597         while (atomic_read(&kgnilnd_data.kgn_npending_conns)   ||
1598                atomic_read(&kgnilnd_data.kgn_npending_detach)  ||
1599                atomic_read(&kgnilnd_data.kgn_npending_unlink)) {
1600
1601                 set_current_state(TASK_UNINTERRUPTIBLE);
1602                 schedule_timeout(cfs_time_seconds(1));
1603                 i++;
1604
1605                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, "Waiting on %d peers %d closes %d detaches\n",
1606                                 atomic_read(&kgnilnd_data.kgn_npending_unlink),
1607                                 atomic_read(&kgnilnd_data.kgn_npending_conns),
1608                                 atomic_read(&kgnilnd_data.kgn_npending_detach));
1609         }
1610
1611         return rc;
1612 }
1613
1614 kgn_conn_t *
1615 kgnilnd_get_conn_by_idx(int index)
1616 {
1617         kgn_peer_t        *peer;
1618         struct list_head  *ptmp;
1619         kgn_conn_t        *conn;
1620         struct list_head  *ctmp;
1621         int                i;
1622
1623
1624         for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
1625                 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1626                 list_for_each(ptmp, &kgnilnd_data.kgn_peers[i]) {
1627
1628                         peer = list_entry(ptmp, kgn_peer_t, gnp_list);
1629
1630                         list_for_each(ctmp, &peer->gnp_conns) {
1631                                 conn = list_entry(ctmp, kgn_conn_t, gnc_list);
1632
1633                                 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
1634                                         continue;
1635
1636                                 if (index-- > 0)
1637                                         continue;
1638
1639                                 CDEBUG(D_NET, "++conn[%p] -> %s (%d)\n", conn,
1640                                        libcfs_nid2str(conn->gnc_peer->gnp_nid),
1641                                        atomic_read(&conn->gnc_refcount));
1642                                 kgnilnd_conn_addref(conn);
1643                                 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1644                                 return conn;
1645                         }
1646                 }
1647                 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1648         }
1649
1650         return NULL;
1651 }
1652
1653 int
1654 kgnilnd_get_conn_info(kgn_peer_t *peer,
1655                       int *device_id, __u64 *peerstamp,
1656                       int *tx_seq, int *rx_seq,
1657                       int *fmaq_len, int *nfma, int *nrdma)
1658 {
1659         kgn_conn_t        *conn;
1660         int               rc = 0;
1661
1662         read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1663
1664         conn = kgnilnd_find_conn_locked(peer);
1665         if (conn == NULL) {
1666                 rc = -ENOENT;
1667                 goto out;
1668         }
1669
1670         *device_id = conn->gnc_device->gnd_host_id;
1671         *peerstamp = conn->gnc_peerstamp;
1672         *tx_seq = atomic_read(&conn->gnc_tx_seq);
1673         *rx_seq = atomic_read(&conn->gnc_rx_seq);
1674         *fmaq_len = kgnilnd_count_list(&conn->gnc_fmaq);
1675         *nfma = atomic_read(&conn->gnc_nlive_fma);
1676         *nrdma = atomic_read(&conn->gnc_nlive_rdma);
1677 out:
1678         read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1679         return rc;
1680 }
1681
1682 /* needs write_lock on kgn_peer_conn_lock */
1683 int
1684 kgnilnd_close_peer_conns_locked(kgn_peer_t *peer, int why)
1685 {
1686         kgn_conn_t         *conn;
1687         struct list_head   *ctmp, *cnxt;
1688         int                 count = 0;
1689
1690         list_for_each_safe(ctmp, cnxt, &peer->gnp_conns) {
1691                 conn = list_entry(ctmp, kgn_conn_t, gnc_list);
1692
1693                 if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
1694                         continue;
1695
1696                 count++;
1697                 /* we mark gnc_needs closing and increment kgn_npending_conns so that
1698                  * kgnilnd_del_conn_or_peer can wait on the other threads closing
1699                  * and cleaning up the connection.
1700                  */
1701                 if (!conn->gnc_needs_closing) {
1702                         conn->gnc_needs_closing = 1;
1703                         kgnilnd_admin_addref(kgnilnd_data.kgn_npending_conns);
1704                 }
1705                 kgnilnd_close_conn_locked(conn, why);
1706         }
1707         return count;
1708 }
1709
1710 int
1711 kgnilnd_report_node_state(lnet_nid_t nid, int down)
1712 {
1713         int         rc;
1714         kgn_peer_t  *peer, *new_peer;
1715         LIST_HEAD(zombies);
1716
1717         write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1718         peer = kgnilnd_find_peer_locked(nid);
1719
1720         if (peer == NULL) {
1721                 int       i;
1722                 int       found_net = 0;
1723                 kgn_net_t *net;
1724
1725                 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1726
1727                 /* Don't add a peer for node up events */
1728                 if (down == GNILND_PEER_UP)
1729                         return 0;
1730
1731                 /* find any valid net - we don't care which one... */
1732                 down_read(&kgnilnd_data.kgn_net_rw_sem);
1733                 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
1734                         list_for_each_entry(net, &kgnilnd_data.kgn_nets[i],
1735                                             gnn_list) {
1736                                 found_net = 1;
1737                                 break;
1738                         }
1739
1740                         if (found_net) {
1741                                 break;
1742                         }
1743                 }
1744                 up_read(&kgnilnd_data.kgn_net_rw_sem);
1745
1746                 if (!found_net) {
1747                         CNETERR("Could not find a net for nid %lld\n", nid);
1748                         return 1;
1749                 }
1750
1751                 /* The nid passed in does not yet contain the net portion.
1752                  * Let's build it up now
1753                  */
1754                 nid = LNET_MKNID(LNET_NIDNET(net->gnn_ni->ni_nid), nid);
1755                 rc = kgnilnd_add_peer(net, nid, &new_peer);
1756
1757                 if (rc) {
1758                         CNETERR("Could not add peer for nid %lld, rc %d\n",
1759                                 nid, rc);
1760                         return 1;
1761                 }
1762
1763                 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1764                 peer = kgnilnd_find_peer_locked(nid);
1765
1766                 if (peer == NULL) {
1767                         CNETERR("Could not find peer for nid %lld\n", nid);
1768                         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1769                         return 1;
1770                 }
1771         }
1772
1773         peer->gnp_state = down;
1774
1775         if (down == GNILND_PEER_DOWN) {
1776                 kgn_conn_t *conn;
1777
1778                 peer->gnp_down_event_time = jiffies;
1779                 kgnilnd_cancel_peer_connect_locked(peer, &zombies);
1780                 conn = kgnilnd_find_conn_locked(peer);
1781
1782                 if (conn != NULL) {
1783                         kgnilnd_close_conn_locked(conn, -ENETRESET);
1784                 }
1785         } else {
1786                 peer->gnp_up_event_time = jiffies;
1787         }
1788
1789         write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1790
1791         if (down == GNILND_PEER_DOWN) {
1792                 /* using ENETRESET so we don't get messages from
1793                  * kgnilnd_tx_done
1794                  */
1795                 kgnilnd_txlist_done(&zombies, -ENETRESET);
1796                 kgnilnd_peer_notify(peer, -ECONNRESET, 0);
1797                 LCONSOLE_INFO("Received down event for nid %d\n",
1798                               LNET_NIDADDR(nid));
1799         }
1800
1801         return 0;
1802 }
1803
1804 int
1805 kgnilnd_ctl(struct lnet_ni *ni, unsigned int cmd, void *arg)
1806 {
1807         struct libcfs_ioctl_data *data = arg;
1808         kgn_net_t                *net = ni->ni_data;
1809         int                       rc = -EINVAL;
1810
1811         LASSERT(ni == net->gnn_ni);
1812
1813         switch (cmd) {
1814         case IOC_LIBCFS_GET_PEER: {
1815                 lnet_nid_t   nid = 0;
1816                 kgn_peer_t  *peer = NULL;
1817                 __u32 nic_addr = 0;
1818                 __u64 peerstamp = 0;
1819                 int peer_refcount = 0, peer_connecting = 0;
1820                 int device_id = 0;
1821                 int tx_seq = 0, rx_seq = 0;
1822                 int fmaq_len = 0, nfma = 0, nrdma = 0;
1823
1824                 rc = kgnilnd_get_peer_info(data->ioc_count, &peer,
1825                                            &nid, &nic_addr, &peer_refcount,
1826                                            &peer_connecting);
1827                 if (rc)
1828                         break;
1829
1830                 /* Barf */
1831                 /* LNET_MKNID is used to mask from lnet the multiplexing/demultiplexing of connections and peers
1832                  * LNET assumes a conn and peer per net, the LNET_MKNID/LNET_NIDADDR allows us to let Lnet see what it
1833                  * wants to see instead of the underlying network that is being used to send the data
1834                  */
1835                 data->ioc_nid    = LNET_MKNID(LNET_NIDNET(ni->ni_nid), LNET_NIDADDR(nid));
1836                 data->ioc_flags  = peer_connecting;
1837                 data->ioc_count  = peer_refcount;
1838
1839                 rc = kgnilnd_get_conn_info(peer, &device_id, &peerstamp,
1840                                            &tx_seq, &rx_seq, &fmaq_len,
1841                                            &nfma, &nrdma);
1842
1843                 /* This is allowable - a persistent peer could not
1844                  * have a connection */
1845                 if (rc) {
1846                         /* flag to indicate we are not connected -
1847                          * need to print as such */
1848                         data->ioc_flags |= (1<<16);
1849                         rc = 0;
1850                 } else {
1851                         /* still barf */
1852                         data->ioc_net = device_id;
1853                         data->ioc_u64[0] = peerstamp;
1854                         data->ioc_u32[0] = fmaq_len;
1855                         data->ioc_u32[1] = nfma;
1856                         data->ioc_u32[2] = tx_seq;
1857                         data->ioc_u32[3] = rx_seq;
1858                         data->ioc_u32[4] = nrdma;
1859                 }
1860                 break;
1861         }
1862         case IOC_LIBCFS_ADD_PEER: {
1863                 /* just dummy value to allow using common interface */
1864                 kgn_peer_t      *peer;
1865                 rc = kgnilnd_add_peer(net, data->ioc_nid, &peer);
1866                 break;
1867         }
1868         case IOC_LIBCFS_DEL_PEER: {
1869                 /* NULL is passed in so it affects all peers in existence without regard to network
1870                  * as the peer may not exist on the network LNET believes it to be on.
1871                  */
1872                 rc = kgnilnd_del_conn_or_peer(NULL, data->ioc_nid,
1873                                               GNILND_DEL_PEER, -EUCLEAN);
1874                 break;
1875         }
1876         case IOC_LIBCFS_GET_CONN: {
1877                 kgn_conn_t *conn = kgnilnd_get_conn_by_idx(data->ioc_count);
1878
1879                 if (conn == NULL)
1880                         rc = -ENOENT;
1881                 else {
1882                         rc = 0;
1883                         /* LNET_MKNID is used to build the correct address based on what LNET wants to see instead of
1884                          * the generic connection that is used to send the data
1885                          */
1886                         data->ioc_nid    = LNET_MKNID(LNET_NIDNET(ni->ni_nid), LNET_NIDADDR(conn->gnc_peer->gnp_nid));
1887                         data->ioc_u32[0] = conn->gnc_device->gnd_id;
1888                         kgnilnd_conn_decref(conn);
1889                 }
1890                 break;
1891         }
1892         case IOC_LIBCFS_CLOSE_CONNECTION: {
1893                 /* use error = -ENETRESET to indicate it was lctl disconnect */
1894                 /* NULL is passed in so it affects all the nets as the connection is virtual
1895                  * and may not exist on the network LNET believes it to be on.
1896                  */
1897                 rc = kgnilnd_del_conn_or_peer(NULL, data->ioc_nid,
1898                                               GNILND_DEL_CONN, -ENETRESET);
1899                 break;
1900         }
1901         case IOC_LIBCFS_PUSH_CONNECTION: {
1902                 /* we use this to flush purgatory */
1903                 rc = kgnilnd_del_conn_or_peer(NULL, data->ioc_nid,
1904                                               GNILND_CLEAR_PURGATORY, -EUCLEAN);
1905                 break;
1906         }
1907         case IOC_LIBCFS_REGISTER_MYNID: {
1908                 /* Ignore if this is a noop */
1909                 if (data->ioc_nid == ni->ni_nid) {
1910                         rc = 0;
1911                 } else {
1912                         CERROR("obsolete IOC_LIBCFS_REGISTER_MYNID: %s(%s)\n",
1913                                libcfs_nid2str(data->ioc_nid),
1914                                libcfs_nid2str(ni->ni_nid));
1915                         rc = -EINVAL;
1916                 }
1917                 break;
1918         }
1919         }
1920
1921         return rc;
1922 }
1923
1924 void
1925 kgnilnd_query(struct lnet_ni *ni, lnet_nid_t nid, time64_t *when)
1926 {
1927         kgn_net_t               *net = ni->ni_data;
1928         kgn_tx_t                *tx;
1929         kgn_peer_t              *peer = NULL;
1930         kgn_conn_t              *conn = NULL;
1931         struct lnet_process_id       id = {
1932                 .nid = nid,
1933                 .pid = LNET_PID_LUSTRE,
1934         };
1935         ENTRY;
1936
1937         /* I expect to find him, so only take a read lock */
1938         read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1939         peer = kgnilnd_find_peer_locked(nid);
1940         if (peer != NULL) {
1941                 /* LIE if in a quiesce - we will update the timeouts after,
1942                  * but we don't want sends failing during it */
1943                 if (kgnilnd_data.kgn_quiesce_trigger) {
1944                         *when = ktime_get_seconds();
1945                         read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1946                         GOTO(out, 0);
1947                 }
1948
1949                 /* Update to best guess, might refine on later checks */
1950                 *when = peer->gnp_last_alive;
1951
1952                 /* we have a peer, how about a conn? */
1953                 conn = kgnilnd_find_conn_locked(peer);
1954
1955                 if (conn == NULL)  {
1956                         /* if there is no conn, check peer last errno to see if clean disconnect
1957                          * - if it was, we lie to LNet because we believe a TX would complete
1958                          * on reconnect */
1959                         if (kgnilnd_conn_clean_errno(peer->gnp_last_errno)) {
1960                                 *when = ktime_get_seconds();
1961                         }
1962                         /* we still want to fire a TX and new conn in this case */
1963                 } else {
1964                         /* gnp_last_alive is valid, run for the hills */
1965                         read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1966                         GOTO(out, 0);
1967                 }
1968         }
1969         /* if we get here, either we have no peer or no conn for him, so fire off
1970          * new TX to trigger conn setup */
1971         read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1972
1973         /* if we couldn't find him, we'll fire up a TX and get connected -
1974          * if we don't do this, after ni_peer_timeout, LNet will declare him dead.
1975          * So really we treat kgnilnd_query as a bit of a 'connect now' type
1976          * event because it'll only do this when it wants to send
1977          *
1978          * Use a real TX for this to get the proper gnp_tx_queue behavior, etc
1979          * normally we'd use kgnilnd_send_ctlmsg for this, but we don't really
1980          * care that this goes out quickly since we already know we need a new conn
1981          * formed */
1982         if (CFS_FAIL_CHECK(CFS_FAIL_GNI_NOOP_SEND))
1983                 return;
1984
1985         tx = kgnilnd_new_tx_msg(GNILND_MSG_NOOP, ni->ni_nid);
1986         if (tx != NULL) {
1987                 kgnilnd_launch_tx(tx, net, &id);
1988         }
1989 out:
1990         CDEBUG(D_NETTRACE, "peer 0x%p->%s when %lld\n", peer,
1991                libcfs_nid2str(nid), *when);
1992         EXIT;
1993 }
1994
1995 int
1996 kgnilnd_dev_init(kgn_device_t *dev)
1997 {
1998         gni_return_t      rrc;
1999         int               rc = 0;
2000         unsigned int      cq_size;
2001         ENTRY;
2002
2003         /* size of these CQs should be able to accommodate the outgoing
2004          * RDMA and SMSG transactions.  Since we really don't know what we
2005          * really need here, we'll take credits * 2 * 3 to allow a bunch.
2006          * We need to dig into this more with the performance work. */
2007         cq_size = *kgnilnd_tunables.kgn_credits * 2 * 3;
2008
2009         rrc = kgnilnd_cdm_create(dev->gnd_id, *kgnilnd_tunables.kgn_ptag,
2010                                  *kgnilnd_tunables.kgn_pkey, 0,
2011                                  &dev->gnd_domain);
2012         if (rrc != GNI_RC_SUCCESS) {
2013                 CERROR("Can't create CDM %d (%d)\n", dev->gnd_id, rrc);
2014                 GOTO(failed, rc = -ENODEV);
2015         }
2016
2017         rrc = kgnilnd_cdm_attach(dev->gnd_domain, dev->gnd_id,
2018                                  &dev->gnd_host_id, &dev->gnd_handle);
2019         if (rrc != GNI_RC_SUCCESS) {
2020                 CERROR("Can't attach CDM to device %d (%d)\n",
2021                         dev->gnd_id, rrc);
2022                 GOTO(failed, rc = -ENODEV);
2023         }
2024
2025         /* a bit gross, but not much we can do - Aries Sim doesn't have
2026          * hardcoded NIC/NID that we can use */
2027         rc = kgnilnd_setup_nic_translation(dev->gnd_host_id);
2028         if (rc != 0)
2029                 GOTO(failed, rc = -ENODEV);
2030
2031         /* only dev 0 gets the errors - no need to reset the stack twice
2032          * - this works because we have a single PTAG, if we had more
2033          * then we'd need to have multiple handlers */
2034         if (dev->gnd_id == 0) {
2035                 rrc = kgnilnd_subscribe_errors(dev->gnd_handle,
2036                                                 GNI_ERRMASK_CRITICAL |
2037                                                 GNI_ERRMASK_UNKNOWN_TRANSACTION,
2038                                               0, NULL, kgnilnd_critical_error,
2039                                               &dev->gnd_err_handle);
2040                 if (rrc != GNI_RC_SUCCESS) {
2041                         CERROR("Can't subscribe for errors on device %d: rc %d\n",
2042                                 dev->gnd_id, rrc);
2043                         GOTO(failed, rc = -ENODEV);
2044                 }
2045
2046                 rc = kgnilnd_set_quiesce_callback(dev->gnd_handle,
2047                                                   kgnilnd_quiesce_end_callback);
2048                 if (rc != GNI_RC_SUCCESS) {
2049                         CERROR("Can't subscribe for quiesce callback on device %d: rc %d\n",
2050                                 dev->gnd_id, rrc);
2051                         GOTO(failed, rc = -ENODEV);
2052                 }
2053         }
2054
2055         rc = kgnilnd_nicaddr_to_nid(dev->gnd_host_id, &dev->gnd_nid);
2056         if (rc < 0) {
2057                 /* log messages during startup */
2058                 if (kgnilnd_data.kgn_init < GNILND_INIT_ALL) {
2059                         CERROR("couldn't translate host_id 0x%x to nid. rc %d\n",
2060                                 dev->gnd_host_id, rc);
2061                 }
2062                 GOTO(failed, rc = -ESRCH);
2063         }
2064         CDEBUG(D_NET, "NIC %x -> NID %d\n", dev->gnd_host_id, dev->gnd_nid);
2065
2066         rrc = kgnilnd_cq_create(dev->gnd_handle, *kgnilnd_tunables.kgn_credits,
2067                                 0, kgnilnd_device_callback,
2068                                 dev->gnd_id, &dev->gnd_snd_rdma_cqh);
2069         if (rrc != GNI_RC_SUCCESS) {
2070                 CERROR("Can't create rdma send cq size %u for device "
2071                        "%d (%d)\n", cq_size, dev->gnd_id, rrc);
2072                 GOTO(failed, rc = -EINVAL);
2073         }
2074
2075         rrc = kgnilnd_cq_create(dev->gnd_handle, cq_size,
2076                         0, kgnilnd_device_callback, dev->gnd_id,
2077                         &dev->gnd_snd_fma_cqh);
2078         if (rrc != GNI_RC_SUCCESS) {
2079                 CERROR("Can't create fma send cq size %u for device %d (%d)\n",
2080                        cq_size, dev->gnd_id, rrc);
2081                 GOTO(failed, rc = -EINVAL);
2082         }
2083
2084         /* This one we size differently - overflows are possible and it needs to be
2085          * sized based on machine size */
2086         rrc = kgnilnd_cq_create(dev->gnd_handle,
2087                         *kgnilnd_tunables.kgn_fma_cq_size,
2088                         0, kgnilnd_device_callback, dev->gnd_id,
2089                         &dev->gnd_rcv_fma_cqh);
2090         if (rrc != GNI_RC_SUCCESS) {
2091                 CERROR("Can't create fma cq size %d for device %d (%d)\n",
2092                        *kgnilnd_tunables.kgn_fma_cq_size, dev->gnd_id, rrc);
2093                 GOTO(failed, rc = -EINVAL);
2094         }
2095
2096         rrc = kgnilnd_register_smdd_buf(dev);
2097         if (rrc != GNI_RC_SUCCESS) {
2098                 GOTO(failed, rc = -EINVAL);
2099         }
2100
2101         RETURN(0);
2102
2103 failed:
2104         kgnilnd_dev_fini(dev);
2105         RETURN(rc);
2106 }
2107
2108 void
2109 kgnilnd_dev_fini(kgn_device_t *dev)
2110 {
2111         gni_return_t rrc;
2112         ENTRY;
2113
2114         /* At quiesce or rest time, need to loop through and clear gnd_ready_conns ?*/
2115         LASSERTF(list_empty(&dev->gnd_ready_conns) &&
2116                  list_empty(&dev->gnd_map_tx) &&
2117                  list_empty(&dev->gnd_rdmaq) &&
2118                  list_empty(&dev->gnd_delay_conns),
2119                  "dev 0x%p ready_conns %d@0x%p delay_conns %d@0x%p"
2120                  "map_tx %d@0x%p rdmaq %d@0x%p\n",
2121                  dev, kgnilnd_count_list(&dev->gnd_ready_conns), &dev->gnd_ready_conns,
2122                  kgnilnd_count_list(&dev->gnd_delay_conns), &dev->gnd_delay_conns,
2123                  kgnilnd_count_list(&dev->gnd_map_tx), &dev->gnd_map_tx,
2124                  kgnilnd_count_list(&dev->gnd_rdmaq), &dev->gnd_rdmaq);
2125
2126         /* These should follow from tearing down all connections */
2127         LASSERTF(dev->gnd_map_nphys == 0 && dev->gnd_map_physnop == 0,
2128                 "%d physical mappings of %d pages still mapped\n",
2129                  dev->gnd_map_nphys, dev->gnd_map_physnop);
2130
2131         LASSERTF(dev->gnd_map_nvirt == 0 && dev->gnd_map_virtnob == 0,
2132                 "%d virtual mappings of %llu bytes still mapped\n",
2133                  dev->gnd_map_nvirt, dev->gnd_map_virtnob);
2134
2135         LASSERTF(atomic_read(&dev->gnd_n_mdd) == 0 &&
2136                  atomic_read(&dev->gnd_n_mdd_held) == 0 &&
2137                  atomic64_read(&dev->gnd_nbytes_map) == 0,
2138                 "%d SMSG mappings of %ld bytes still mapped or held %d\n",
2139                  atomic_read(&dev->gnd_n_mdd),
2140                  atomic64_read(&dev->gnd_nbytes_map), atomic_read(&dev->gnd_n_mdd_held));
2141
2142         LASSERT(list_empty(&dev->gnd_map_list));
2143
2144         /* What other assertions needed to ensure all connections torn down ? */
2145
2146         /* check all counters == 0 (EP, MDD, etc) */
2147
2148         /* if we are resetting due to quiese (stack reset), don't check
2149          * thread states */
2150         LASSERTF(kgnilnd_data.kgn_quiesce_trigger ||
2151                 atomic_read(&kgnilnd_data.kgn_nthreads) == 0,
2152                 "tried to shutdown with threads active\n");
2153
2154         if (dev->gnd_smdd_hold_buf) {
2155                 rrc = kgnilnd_deregister_smdd_buf(dev);
2156                 LASSERTF(rrc == GNI_RC_SUCCESS,
2157                         "bad rc from deregistion of sMDD buffer: %d\n", rrc);
2158                 dev->gnd_smdd_hold_buf = NULL;
2159         }
2160
2161         if (dev->gnd_rcv_fma_cqh) {
2162                 rrc = kgnilnd_cq_destroy(dev->gnd_rcv_fma_cqh);
2163                 LASSERTF(rrc == GNI_RC_SUCCESS,
2164                         "bad rc from gni_cq_destroy on rcv_fma_cqh: %d\n", rrc);
2165                 dev->gnd_rcv_fma_cqh = NULL;
2166         }
2167
2168         if (dev->gnd_snd_rdma_cqh) {
2169                 rrc = kgnilnd_cq_destroy(dev->gnd_snd_rdma_cqh);
2170                 LASSERTF(rrc == GNI_RC_SUCCESS,
2171                         "bad rc from gni_cq_destroy on send_rdma_cqh: %d\n", rrc);
2172                 dev->gnd_snd_rdma_cqh = NULL;
2173         }
2174
2175         if (dev->gnd_snd_fma_cqh) {
2176                 rrc = kgnilnd_cq_destroy(dev->gnd_snd_fma_cqh);
2177                 LASSERTF(rrc == GNI_RC_SUCCESS,
2178                         "bad rc from gni_cq_destroy on snd_fma_cqh: %d\n", rrc);
2179                 dev->gnd_snd_fma_cqh = NULL;
2180         }
2181
2182         if (dev->gnd_err_handle) {
2183                 rrc = kgnilnd_release_errors(dev->gnd_err_handle);
2184                 LASSERTF(rrc == GNI_RC_SUCCESS,
2185                         "bad rc from gni_release_errors: %d\n", rrc);
2186                 dev->gnd_err_handle = NULL;
2187         }
2188
2189         if (dev->gnd_domain) {
2190                 rrc = kgnilnd_cdm_destroy(dev->gnd_domain);
2191                 LASSERTF(rrc == GNI_RC_SUCCESS,
2192                         "bad rc from gni_cdm_destroy: %d\n", rrc);
2193                 dev->gnd_domain = NULL;
2194         }
2195
2196         EXIT;
2197 }
2198
2199 int kgnilnd_base_startup(void)
2200 {
2201         struct timeval       tv;
2202         int                  pkmem = atomic_read(&libcfs_kmemory);
2203         int                  rc;
2204         int                  i;
2205         kgn_device_t        *dev;
2206         struct task_struct  *thrd;
2207
2208 #if defined(CONFIG_CRAY_XT) && !defined(CONFIG_CRAY_COMPUTE)
2209         /* limit how much memory can be allocated for fma blocks in
2210          * instances where many nodes need to reconnects at the same time */
2211         struct sysinfo si;
2212         si_meminfo(&si);
2213         kgnilnd_data.free_pages_limit = si.totalram/4;
2214 #endif
2215
2216         ENTRY;
2217
2218         LASSERTF(kgnilnd_data.kgn_init == GNILND_INIT_NOTHING,
2219                 "init %d\n", kgnilnd_data.kgn_init);
2220
2221         /* zero pointers, flags etc */
2222         memset(&kgnilnd_data, 0, sizeof(kgnilnd_data));
2223         kgnilnd_check_kgni_version();
2224
2225         /* CAVEAT EMPTOR: Every 'Fma' message includes the sender's NID and
2226          * a unique (for all time) connstamp so we can uniquely identify
2227          * the sender.  The connstamp is an incrementing counter
2228          * initialised with seconds + microseconds at startup time.  So we
2229          * rely on NOT creating connections more frequently on average than
2230          * 1MHz to ensure we don't use old connstamps when we reboot. */
2231         do_gettimeofday(&tv);
2232         kgnilnd_data.kgn_connstamp =
2233                  kgnilnd_data.kgn_peerstamp =
2234                         (((__u64)tv.tv_sec) * 1000000) + tv.tv_usec;
2235
2236         init_rwsem(&kgnilnd_data.kgn_net_rw_sem);
2237
2238         for (i = 0; i < GNILND_MAXDEVS; i++) {
2239                 kgn_device_t  *dev = &kgnilnd_data.kgn_devices[i];
2240
2241                 dev->gnd_id = i;
2242                 INIT_LIST_HEAD(&dev->gnd_ready_conns);
2243                 INIT_LIST_HEAD(&dev->gnd_delay_conns);
2244                 INIT_LIST_HEAD(&dev->gnd_map_tx);
2245                 INIT_LIST_HEAD(&dev->gnd_fma_buffs);
2246                 mutex_init(&dev->gnd_cq_mutex);
2247                 mutex_init(&dev->gnd_fmablk_mutex);
2248                 spin_lock_init(&dev->gnd_fmablk_lock);
2249                 init_waitqueue_head(&dev->gnd_waitq);
2250                 init_waitqueue_head(&dev->gnd_dgram_waitq);
2251                 init_waitqueue_head(&dev->gnd_dgping_waitq);
2252                 spin_lock_init(&dev->gnd_lock);
2253                 INIT_LIST_HEAD(&dev->gnd_map_list);
2254                 spin_lock_init(&dev->gnd_map_lock);
2255                 atomic_set(&dev->gnd_nfmablk, 0);
2256                 atomic_set(&dev->gnd_fmablk_vers, 1);
2257                 atomic_set(&dev->gnd_neps, 0);
2258                 atomic_set(&dev->gnd_canceled_dgrams, 0);
2259                 INIT_LIST_HEAD(&dev->gnd_connd_peers);
2260                 spin_lock_init(&dev->gnd_connd_lock);
2261                 spin_lock_init(&dev->gnd_dgram_lock);
2262                 spin_lock_init(&dev->gnd_rdmaq_lock);
2263                 INIT_LIST_HEAD(&dev->gnd_rdmaq);
2264                 init_rwsem(&dev->gnd_conn_sem);
2265
2266                 /* alloc & setup nid based dgram table */
2267                 LIBCFS_ALLOC(dev->gnd_dgrams,
2268                             sizeof(struct list_head) * *kgnilnd_tunables.kgn_peer_hash_size);
2269
2270                 if (dev->gnd_dgrams == NULL)
2271                         GOTO(failed, rc = -ENOMEM);
2272
2273                 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
2274                         INIT_LIST_HEAD(&dev->gnd_dgrams[i]);
2275                 }
2276                 atomic_set(&dev->gnd_ndgrams, 0);
2277                 atomic_set(&dev->gnd_nwcdgrams, 0);
2278                 /* setup timer for RDMAQ processing */
2279                 setup_timer(&dev->gnd_rdmaq_timer, kgnilnd_schedule_device_timer,
2280                             (unsigned long)dev);
2281
2282                 /* setup timer for mapping processing */
2283                 setup_timer(&dev->gnd_map_timer, kgnilnd_schedule_device_timer,
2284                             (unsigned long)dev);
2285
2286         }
2287
2288         /* CQID 0 isn't allowed, set to MAX_MSG_ID - 1 to check for conflicts early */
2289         kgnilnd_data.kgn_next_cqid = GNILND_MAX_MSG_ID - 1;
2290         kgnilnd_data.kgn_new_min_timeout = *kgnilnd_tunables.kgn_timeout;
2291         init_waitqueue_head(&kgnilnd_data.kgn_reaper_waitq);
2292         init_waitqueue_head(&kgnilnd_data.kgn_ruhroh_waitq);
2293         spin_lock_init(&kgnilnd_data.kgn_reaper_lock);
2294
2295         mutex_init(&kgnilnd_data.kgn_quiesce_mutex);
2296         atomic_set(&kgnilnd_data.kgn_nquiesce, 0);
2297         atomic_set(&kgnilnd_data.kgn_npending_conns, 0);
2298         atomic_set(&kgnilnd_data.kgn_npending_unlink, 0);
2299         atomic_set(&kgnilnd_data.kgn_npending_detach, 0);
2300         atomic_set(&kgnilnd_data.kgn_rev_offset, 0);
2301         atomic_set(&kgnilnd_data.kgn_rev_length, 0);
2302         atomic_set(&kgnilnd_data.kgn_rev_copy_buff, 0);
2303
2304         /* OK to call kgnilnd_api_shutdown() to cleanup now */
2305         kgnilnd_data.kgn_init = GNILND_INIT_DATA;
2306         try_module_get(THIS_MODULE);
2307
2308         rwlock_init(&kgnilnd_data.kgn_peer_conn_lock);
2309
2310         LIBCFS_ALLOC(kgnilnd_data.kgn_peers,
2311                     sizeof(struct list_head) * *kgnilnd_tunables.kgn_peer_hash_size);
2312
2313         if (kgnilnd_data.kgn_peers == NULL)
2314                 GOTO(failed, rc = -ENOMEM);
2315
2316         for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
2317                 INIT_LIST_HEAD(&kgnilnd_data.kgn_peers[i]);
2318         }
2319
2320         LIBCFS_ALLOC(kgnilnd_data.kgn_conns,
2321                     sizeof(struct list_head) * *kgnilnd_tunables.kgn_peer_hash_size);
2322
2323         if (kgnilnd_data.kgn_conns == NULL)
2324                 GOTO(failed, rc = -ENOMEM);
2325
2326         for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
2327                 INIT_LIST_HEAD(&kgnilnd_data.kgn_conns[i]);
2328         }
2329
2330         LIBCFS_ALLOC(kgnilnd_data.kgn_nets,
2331                     sizeof(struct list_head) * *kgnilnd_tunables.kgn_net_hash_size);
2332
2333         if (kgnilnd_data.kgn_nets == NULL)
2334                 GOTO(failed, rc = -ENOMEM);
2335
2336         for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
2337                 INIT_LIST_HEAD(&kgnilnd_data.kgn_nets[i]);
2338         }
2339
2340         kgnilnd_data.kgn_mbox_cache =
2341                 kmem_cache_create("kgn_mbox_block", GNILND_MBOX_SIZE, 0,
2342                                   SLAB_HWCACHE_ALIGN, NULL);
2343         if (kgnilnd_data.kgn_mbox_cache == NULL) {
2344                 CERROR("Can't create slab for physical mbox blocks\n");
2345                 GOTO(failed, rc = -ENOMEM);
2346         }
2347
2348         kgnilnd_data.kgn_rx_cache =
2349                 kmem_cache_create("kgn_rx_t", sizeof(kgn_rx_t), 0, 0, NULL);
2350         if (kgnilnd_data.kgn_rx_cache == NULL) {
2351                 CERROR("Can't create slab for kgn_rx_t descriptors\n");
2352                 GOTO(failed, rc = -ENOMEM);
2353         }
2354
2355         kgnilnd_data.kgn_tx_cache =
2356                 kmem_cache_create("kgn_tx_t", sizeof(kgn_tx_t), 0, 0, NULL);
2357         if (kgnilnd_data.kgn_tx_cache == NULL) {
2358                 CERROR("Can't create slab for kgn_tx_t\n");
2359                 GOTO(failed, rc = -ENOMEM);
2360         }
2361
2362         kgnilnd_data.kgn_tx_phys_cache =
2363                 kmem_cache_create("kgn_tx_phys",
2364                                    LNET_MAX_IOV * sizeof(gni_mem_segment_t),
2365                                    0, 0, NULL);
2366         if (kgnilnd_data.kgn_tx_phys_cache == NULL) {
2367                 CERROR("Can't create slab for kgn_tx_phys\n");
2368                 GOTO(failed, rc = -ENOMEM);
2369         }
2370
2371         kgnilnd_data.kgn_dgram_cache =
2372                 kmem_cache_create("kgn_dgram_t", sizeof(kgn_dgram_t), 0, 0, NULL);
2373         if (kgnilnd_data.kgn_dgram_cache == NULL) {
2374                 CERROR("Can't create slab for outgoing datagrams\n");
2375                 GOTO(failed, rc = -ENOMEM);
2376         }
2377
2378         /* allocate a MAX_IOV array of page pointers for each cpu */
2379         kgnilnd_data.kgn_cksum_map_pages = kmalloc(num_possible_cpus() * sizeof (struct page *),
2380                                                    GFP_KERNEL);
2381         if (kgnilnd_data.kgn_cksum_map_pages == NULL) {
2382                 CERROR("Can't allocate vmap cksum pages\n");
2383                 GOTO(failed, rc = -ENOMEM);
2384         }
2385         kgnilnd_data.kgn_cksum_npages = num_possible_cpus();
2386         memset(kgnilnd_data.kgn_cksum_map_pages, 0,
2387                 kgnilnd_data.kgn_cksum_npages * sizeof (struct page *));
2388
2389         for (i = 0; i < kgnilnd_data.kgn_cksum_npages; i++) {
2390                 kgnilnd_data.kgn_cksum_map_pages[i] = kmalloc(LNET_MAX_IOV * sizeof (struct page *),
2391                                                               GFP_KERNEL);
2392                 if (kgnilnd_data.kgn_cksum_map_pages[i] == NULL) {
2393                         CERROR("Can't allocate vmap cksum pages for cpu %d\n", i);
2394                         GOTO(failed, rc = -ENOMEM);
2395                 }
2396         }
2397
2398         LASSERT(kgnilnd_data.kgn_ndevs == 0);
2399
2400         /* Use all available GNI devices */
2401         for (i = 0; i < GNILND_MAXDEVS; i++) {
2402                 dev = &kgnilnd_data.kgn_devices[kgnilnd_data.kgn_ndevs];
2403
2404                 rc = kgnilnd_dev_init(dev);
2405                 if (rc == 0) {
2406                         /* Increment here so base_shutdown cleans it up */
2407                         kgnilnd_data.kgn_ndevs++;
2408
2409                         rc = kgnilnd_allocate_phys_fmablk(dev);
2410                         if (rc)
2411                                 GOTO(failed, rc);
2412                 }
2413         }
2414
2415         if (kgnilnd_data.kgn_ndevs == 0) {
2416                 CERROR("Can't initialise any GNI devices\n");
2417                 GOTO(failed, rc = -ENODEV);
2418         }
2419
2420         rc = kgnilnd_thread_start(kgnilnd_reaper, NULL, "kgnilnd_rpr", 0);
2421         if (rc != 0) {
2422                 CERROR("Can't spawn gnilnd reaper: %d\n", rc);
2423                 GOTO(failed, rc);
2424         }
2425
2426         rc = kgnilnd_start_rca_thread();
2427         if (rc != 0) {
2428                 CERROR("Can't spawn gnilnd rca: %d\n", rc);
2429                 GOTO(failed, rc);
2430         }
2431
2432         /*
2433          * Start ruhroh thread.  We can't use kgnilnd_thread_start() because
2434          * we don't want this thread included in kgnilnd_data.kgn_nthreads
2435          * count.  This thread controls quiesce, so it mustn't
2436          * quiesce itself.
2437          */
2438         thrd = kthread_run(kgnilnd_ruhroh_thread, NULL, "%s_%02d", "kgnilnd_rr", 0);
2439         if (IS_ERR(thrd)) {
2440                 rc = PTR_ERR(thrd);
2441                 CERROR("Can't spawn gnilnd ruhroh thread: %d\n", rc);
2442                 GOTO(failed, rc);
2443         }
2444
2445         /* threads will load balance across devs as they are available */
2446         if (*kgnilnd_tunables.kgn_thread_affinity) {
2447                 rc = kgnilnd_start_sd_threads();
2448                 if (rc != 0)
2449                         GOTO(failed, rc);
2450         } else {
2451                 for (i = 0; i < *kgnilnd_tunables.kgn_sched_threads; i++) {
2452                         rc = kgnilnd_thread_start(kgnilnd_scheduler,
2453                                                   (void *)((long)i),
2454                                                   "kgnilnd_sd", i);
2455                         if (rc != 0) {
2456                                 CERROR("Can't spawn gnilnd scheduler[%d]: %d\n",
2457                                        i, rc);
2458                                 GOTO(failed, rc);
2459                         }
2460                 }
2461         }
2462
2463         for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
2464                 dev = &kgnilnd_data.kgn_devices[i];
2465                 rc = kgnilnd_thread_start(kgnilnd_dgram_mover, dev,
2466                                           "kgnilnd_dg", dev->gnd_id);
2467                 if (rc != 0) {
2468                         CERROR("Can't spawn gnilnd dgram_mover[%d]: %d\n",
2469                                dev->gnd_id, rc);
2470                         GOTO(failed, rc);
2471                 }
2472
2473                 rc = kgnilnd_thread_start(kgnilnd_dgram_waitq, dev,
2474                                           "kgnilnd_dgn", dev->gnd_id);
2475                 if (rc != 0) {
2476                         CERROR("Can't spawn gnilnd dgram_waitq[%d]: %d\n",
2477                                 dev->gnd_id, rc);
2478                         GOTO(failed, rc);
2479                 }
2480
2481                 rc = kgnilnd_setup_wildcard_dgram(dev);
2482
2483                 if (rc != 0) {
2484                         CERROR("Can't create wildcard dgrams[%d]: %d\n",
2485                                 dev->gnd_id, rc);
2486                         GOTO(failed, rc);
2487                 }
2488         }
2489
2490         /* flag everything initialised */
2491         kgnilnd_data.kgn_init = GNILND_INIT_ALL;
2492         /*****************************************************/
2493
2494         CDEBUG(D_MALLOC, "initial kmem %d\n", pkmem);
2495         RETURN(0);
2496
2497 failed:
2498         kgnilnd_base_shutdown();
2499         kgnilnd_data.kgn_init = GNILND_INIT_NOTHING;
2500         RETURN(rc);
2501 }
2502
2503 void
2504 kgnilnd_base_shutdown(void)
2505 {
2506         int                     i, j;
2507         ENTRY;
2508
2509         while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_PAUSE_SHUTDOWN, 1)) {};
2510
2511         kgnilnd_data.kgn_wc_kill = 1;
2512
2513         for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
2514                 kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
2515                 kgnilnd_cancel_wc_dgrams(dev);
2516                 kgnilnd_cancel_dgrams(dev);
2517                 kgnilnd_del_conn_or_peer(NULL, LNET_NID_ANY, GNILND_DEL_PEER, -ESHUTDOWN);
2518                 kgnilnd_wait_for_canceled_dgrams(dev);
2519         }
2520
2521         /* We need to verify there are no conns left before we let the threads
2522          * shut down otherwise we could clean up the peers but still have
2523          * some outstanding conns due to orphaned datagram conns that are
2524          * being cleaned up.
2525          */
2526         i = 2;
2527         while (atomic_read(&kgnilnd_data.kgn_nconns) != 0) {
2528                 i++;
2529
2530                 for(j = 0; j < kgnilnd_data.kgn_ndevs; ++j) {
2531                         kgn_device_t *dev = &kgnilnd_data.kgn_devices[j];
2532                         kgnilnd_schedule_device(dev);
2533                 }
2534
2535                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2536                         "Waiting for conns to be cleaned up %d\n",atomic_read(&kgnilnd_data.kgn_nconns));
2537                 set_current_state(TASK_UNINTERRUPTIBLE);
2538                 schedule_timeout(cfs_time_seconds(1));
2539         }
2540         /* Peer state all cleaned up BEFORE setting shutdown, so threads don't
2541          * have to worry about shutdown races.  NB connections may be created
2542          * while there are still active connds, but these will be temporary
2543          * since peer creation always fails after the listener has started to
2544          * shut down.
2545          * all peers should have been cleared out on the nets */
2546         LASSERTF(atomic_read(&kgnilnd_data.kgn_npeers) == 0,
2547                 "peers left %d\n", atomic_read(&kgnilnd_data.kgn_npeers));
2548
2549         /* Wait for the ruhroh thread to shut down. */
2550         kgnilnd_data.kgn_ruhroh_shutdown = 1;
2551         wake_up(&kgnilnd_data.kgn_ruhroh_waitq);
2552         i = 2;
2553         while (kgnilnd_data.kgn_ruhroh_running != 0) {
2554                 i++;
2555                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2556                        "Waiting for ruhroh thread to terminate\n");
2557                 set_current_state(TASK_UNINTERRUPTIBLE);
2558                 schedule_timeout(cfs_time_seconds(1));
2559         }
2560
2561        /* Flag threads to terminate */
2562         kgnilnd_data.kgn_shutdown = 1;
2563
2564         for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
2565                 kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
2566
2567                 /* should clear all the MDDs */
2568                 kgnilnd_unmap_fma_blocks(dev);
2569
2570                 kgnilnd_schedule_device(dev);
2571                 wake_up_all(&dev->gnd_dgram_waitq);
2572                 wake_up_all(&dev->gnd_dgping_waitq);
2573                 LASSERT(list_empty(&dev->gnd_connd_peers));
2574         }
2575
2576         spin_lock(&kgnilnd_data.kgn_reaper_lock);
2577         wake_up_all(&kgnilnd_data.kgn_reaper_waitq);
2578         spin_unlock(&kgnilnd_data.kgn_reaper_lock);
2579
2580         if (atomic_read(&kgnilnd_data.kgn_nthreads))
2581                 kgnilnd_wakeup_rca_thread();
2582
2583         /* Wait for threads to exit */
2584         i = 2;
2585         while (atomic_read(&kgnilnd_data.kgn_nthreads) != 0) {
2586                 i++;
2587                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
2588                        "Waiting for %d threads to terminate\n",
2589                        atomic_read(&kgnilnd_data.kgn_nthreads));
2590                 set_current_state(TASK_UNINTERRUPTIBLE);
2591                 schedule_timeout(cfs_time_seconds(1));
2592         }
2593
2594         LASSERTF(atomic_read(&kgnilnd_data.kgn_npeers) == 0,
2595                 "peers left %d\n", atomic_read(&kgnilnd_data.kgn_npeers));
2596
2597         if (kgnilnd_data.kgn_peers != NULL) {
2598                 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++)
2599                         LASSERT(list_empty(&kgnilnd_data.kgn_peers[i]));
2600
2601                 LIBCFS_FREE(kgnilnd_data.kgn_peers,
2602                             sizeof (struct list_head) *
2603                             *kgnilnd_tunables.kgn_peer_hash_size);
2604         }
2605
2606         down_write(&kgnilnd_data.kgn_net_rw_sem);
2607         if (kgnilnd_data.kgn_nets != NULL) {
2608                 for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++)
2609                         LASSERT(list_empty(&kgnilnd_data.kgn_nets[i]));
2610
2611                 LIBCFS_FREE(kgnilnd_data.kgn_nets,
2612                             sizeof (struct list_head) *
2613                             *kgnilnd_tunables.kgn_net_hash_size);
2614         }
2615         up_write(&kgnilnd_data.kgn_net_rw_sem);
2616
2617         LASSERTF(atomic_read(&kgnilnd_data.kgn_nconns) == 0,
2618                 "conns left %d\n", atomic_read(&kgnilnd_data.kgn_nconns));
2619
2620         if (kgnilnd_data.kgn_conns != NULL) {
2621                 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++)
2622                         LASSERT(list_empty(&kgnilnd_data.kgn_conns[i]));
2623
2624                 LIBCFS_FREE(kgnilnd_data.kgn_conns,
2625                             sizeof (struct list_head) *
2626                             *kgnilnd_tunables.kgn_peer_hash_size);
2627         }
2628
2629         for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
2630                 kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
2631                 kgnilnd_dev_fini(dev);
2632
2633                 LASSERTF(atomic_read(&dev->gnd_ndgrams) == 0,
2634                         "dgrams left %d\n", atomic_read(&dev->gnd_ndgrams));
2635
2636                 if (dev->gnd_dgrams != NULL) {
2637                         for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++)
2638                                 LASSERT(list_empty(&dev->gnd_dgrams[i]));
2639
2640                         LIBCFS_FREE(dev->gnd_dgrams,
2641                                     sizeof (struct list_head) *
2642                                     *kgnilnd_tunables.kgn_peer_hash_size);
2643                 }
2644
2645                 kgnilnd_free_phys_fmablk(dev);
2646         }
2647
2648         if (kgnilnd_data.kgn_mbox_cache != NULL)
2649                 kmem_cache_destroy(kgnilnd_data.kgn_mbox_cache);
2650
2651         if (kgnilnd_data.kgn_rx_cache != NULL)
2652                 kmem_cache_destroy(kgnilnd_data.kgn_rx_cache);
2653
2654         if (kgnilnd_data.kgn_tx_cache != NULL)
2655                 kmem_cache_destroy(kgnilnd_data.kgn_tx_cache);
2656
2657         if (kgnilnd_data.kgn_tx_phys_cache != NULL)
2658                 kmem_cache_destroy(kgnilnd_data.kgn_tx_phys_cache);
2659
2660         if (kgnilnd_data.kgn_dgram_cache != NULL)
2661                 kmem_cache_destroy(kgnilnd_data.kgn_dgram_cache);
2662
2663         if (kgnilnd_data.kgn_cksum_map_pages != NULL) {
2664                 for (i = 0; i < kgnilnd_data.kgn_cksum_npages; i++) {
2665                         if (kgnilnd_data.kgn_cksum_map_pages[i] != NULL) {
2666                                 kfree(kgnilnd_data.kgn_cksum_map_pages[i]);
2667                         }
2668                 }
2669                 kfree(kgnilnd_data.kgn_cksum_map_pages);
2670         }
2671
2672         CDEBUG(D_MALLOC, "after NAL cleanup: kmem %d\n",
2673                atomic_read(&libcfs_kmemory));
2674
2675         kgnilnd_data.kgn_init = GNILND_INIT_NOTHING;
2676         module_put(THIS_MODULE);
2677
2678         EXIT;
2679 }
2680
2681 int
2682 kgnilnd_startup(struct lnet_ni *ni)
2683 {
2684         int               rc, devno;
2685         kgn_net_t        *net;
2686         ENTRY;
2687
2688         LASSERTF(ni->ni_net->net_lnd == &the_kgnilnd,
2689                 "bad LND 0x%p != the_kgnilnd @ 0x%p\n",
2690                 ni->ni_net->net_lnd, &the_kgnilnd);
2691
2692         if (kgnilnd_data.kgn_init == GNILND_INIT_NOTHING) {
2693                 rc = kgnilnd_base_startup();
2694                 if (rc != 0)
2695                         RETURN(rc);
2696         }
2697
2698         /* Serialize with shutdown. */
2699         mutex_lock(&kgnilnd_data.kgn_quiesce_mutex);
2700
2701         LIBCFS_ALLOC(net, sizeof(*net));
2702         if (net == NULL) {
2703                 CERROR("could not allocate net for new interface instance\n");
2704                 /* no need to cleanup the CDM... */
2705                 GOTO(failed, rc = -ENOMEM);
2706         }
2707         INIT_LIST_HEAD(&net->gnn_list);
2708         ni->ni_data = net;
2709         net->gnn_ni = ni;
2710         if (!ni->ni_net->net_tunables_set) {
2711                 ni->ni_net->net_tunables.lct_max_tx_credits =
2712                         *kgnilnd_tunables.kgn_credits;
2713                 ni->ni_net->net_tunables.lct_peer_tx_credits =
2714                         *kgnilnd_tunables.kgn_peer_credits;
2715         }
2716
2717         if (*kgnilnd_tunables.kgn_peer_health) {
2718                 int     fudge;
2719                 int     timeout;
2720                 /* give this a bit of leeway - we don't have a hard timeout
2721                  * as we only check timeouts periodically - see comment in kgnilnd_reaper */
2722                 fudge = (GNILND_TO2KA(*kgnilnd_tunables.kgn_timeout) / GNILND_REAPER_NCHECKS);
2723                 timeout = *kgnilnd_tunables.kgn_timeout + fudge;
2724
2725                 if (*kgnilnd_tunables.kgn_peer_timeout >= timeout) {
2726                         ni->ni_net->net_tunables.lct_peer_timeout =
2727                                  *kgnilnd_tunables.kgn_peer_timeout;
2728                 } else if (*kgnilnd_tunables.kgn_peer_timeout > -1) {
2729                         LCONSOLE_ERROR("Peer_timeout is set to %d but needs to be >= %d\n",
2730                                         *kgnilnd_tunables.kgn_peer_timeout,
2731                                         timeout);
2732                         ni->ni_data = NULL;
2733                         LIBCFS_FREE(net, sizeof(*net));
2734                         GOTO(failed, rc = -EINVAL);
2735                 } else
2736                         ni->ni_net->net_tunables.lct_peer_timeout = timeout;
2737
2738                 LCONSOLE_INFO("Enabling LNet peer health for gnilnd, timeout %ds\n",
2739                               ni->ni_net->net_tunables.lct_peer_timeout);
2740         }
2741
2742         atomic_set(&net->gnn_refcount, 1);
2743
2744         /* if we have multiple devices, spread the nets around */
2745         net->gnn_netnum = LNET_NETNUM(LNET_NIDNET(ni->ni_nid));
2746
2747         devno = LNET_NIDNET(ni->ni_nid) % GNILND_MAXDEVS;
2748         net->gnn_dev = &kgnilnd_data.kgn_devices[devno];
2749
2750         /* allocate a 'dummy' cdm for datagram use. We can only have a single
2751          * datagram between a nid:inst_id and nid2:inst_id. The fake cdm
2752          * give us additional inst_id to use, allowing the datagrams to flow
2753          * like rivers of honey and beer */
2754
2755         /* the instance id for the cdm is the NETNUM offset by MAXDEVS -
2756          * ensuring we'll have a unique id */
2757
2758
2759         ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), net->gnn_dev->gnd_nid);
2760         CDEBUG(D_NET, "adding net %p nid=%s on dev %d \n",
2761                 net, libcfs_nid2str(ni->ni_nid), net->gnn_dev->gnd_id);
2762         /* until the gnn_list is set, we need to cleanup ourselves as
2763          * kgnilnd_shutdown is just gonna get confused */
2764
2765         down_write(&kgnilnd_data.kgn_net_rw_sem);
2766         list_add_tail(&net->gnn_list, kgnilnd_netnum2netlist(net->gnn_netnum));
2767         up_write(&kgnilnd_data.kgn_net_rw_sem);
2768
2769         /* we need a separate thread to call probe_wait_by_id until
2770          * we get a function callback notifier from kgni */
2771         mutex_unlock(&kgnilnd_data.kgn_quiesce_mutex);
2772         RETURN(0);
2773  failed:
2774         mutex_unlock(&kgnilnd_data.kgn_quiesce_mutex);
2775         kgnilnd_shutdown(ni);
2776         RETURN(rc);
2777 }
2778
2779 void
2780 kgnilnd_shutdown(struct lnet_ni *ni)
2781 {
2782         kgn_net_t     *net = ni->ni_data;
2783         int           i;
2784         int           rc;
2785         ENTRY;
2786
2787         CFS_RACE(CFS_FAIL_GNI_SR_DOWN_RACE);
2788
2789         LASSERTF(kgnilnd_data.kgn_init == GNILND_INIT_ALL,
2790                 "init %d\n", kgnilnd_data.kgn_init);
2791
2792         /* Serialize with startup. */
2793         mutex_lock(&kgnilnd_data.kgn_quiesce_mutex);
2794         CDEBUG(D_MALLOC, "before NAL cleanup: kmem %d\n",
2795                atomic_read(&libcfs_kmemory));
2796
2797         if (net == NULL) {
2798                 CERROR("got NULL net for ni %p\n", ni);
2799                 GOTO(out, rc = -EINVAL);
2800         }
2801
2802         LASSERTF(ni == net->gnn_ni,
2803                 "ni %p gnn_ni %p\n", net, net->gnn_ni);
2804
2805         ni->ni_data = NULL;
2806
2807         LASSERT(!net->gnn_shutdown);
2808         LASSERTF(atomic_read(&net->gnn_refcount) != 0,
2809                 "net %p refcount %d\n",
2810                  net, atomic_read(&net->gnn_refcount));
2811
2812         if (!list_empty(&net->gnn_list)) {
2813                 /* serialize with peer creation */
2814                 down_write(&kgnilnd_data.kgn_net_rw_sem);
2815                 net->gnn_shutdown = 1;
2816                 up_write(&kgnilnd_data.kgn_net_rw_sem);
2817
2818                 kgnilnd_cancel_net_dgrams(net);
2819
2820                 kgnilnd_del_conn_or_peer(net, LNET_NID_ANY, GNILND_DEL_PEER, -ESHUTDOWN);
2821
2822                 /* if we are quiesced, need to wake up - we need those threads
2823                  * alive to release peers, etc */
2824                 if (GNILND_IS_QUIESCED) {
2825                         set_mb(kgnilnd_data.kgn_quiesce_trigger, GNILND_QUIESCE_IDLE);
2826                         kgnilnd_quiesce_wait("shutdown");
2827                 }
2828
2829                 kgnilnd_wait_for_canceled_dgrams(net->gnn_dev);
2830
2831                 /* We wait until the nets ref's are 1, we will release final ref which is ours
2832                  * this allows us to make sure everything else is done before we free the
2833                  * net.
2834                  */
2835                 i = 4;
2836                 while (atomic_read(&net->gnn_refcount) != 1) {
2837                         i++;
2838                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2839                                 "Waiting for %d references to clear on net %d\n",
2840                                 atomic_read(&net->gnn_refcount),
2841                                 net->gnn_netnum);
2842                         set_current_state(TASK_UNINTERRUPTIBLE);
2843                         schedule_timeout(cfs_time_seconds(1));
2844                 }
2845
2846                 /* release ref from kgnilnd_startup */
2847                 kgnilnd_net_decref(net);
2848                 /* serialize with reaper and conn_task looping */
2849                 down_write(&kgnilnd_data.kgn_net_rw_sem);
2850                 list_del_init(&net->gnn_list);
2851                 up_write(&kgnilnd_data.kgn_net_rw_sem);
2852
2853         }
2854
2855         /* not locking, this can't race with writers */
2856         LASSERTF(atomic_read(&net->gnn_refcount) == 0,
2857                 "net %p refcount %d\n",
2858                  net, atomic_read(&net->gnn_refcount));
2859         LIBCFS_FREE(net, sizeof(*net));
2860
2861 out:
2862         down_read(&kgnilnd_data.kgn_net_rw_sem);
2863         for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
2864                 if (!list_empty(&kgnilnd_data.kgn_nets[i])) {
2865                         up_read(&kgnilnd_data.kgn_net_rw_sem);
2866                         break;
2867                 }
2868
2869                 if (i == *kgnilnd_tunables.kgn_net_hash_size - 1) {
2870                         up_read(&kgnilnd_data.kgn_net_rw_sem);
2871                         kgnilnd_base_shutdown();
2872                 }
2873         }
2874         CDEBUG(D_MALLOC, "after NAL cleanup: kmem %d\n",
2875                atomic_read(&libcfs_kmemory));
2876
2877         mutex_unlock(&kgnilnd_data.kgn_quiesce_mutex);
2878         EXIT;
2879 }
2880
2881 static void __exit kgnilnd_exit(void)
2882 {
2883         lnet_unregister_lnd(&the_kgnilnd);
2884         kgnilnd_proc_fini();
2885         kgnilnd_remove_sysctl();
2886 }
2887
2888 static int __init kgnilnd_init(void)
2889 {
2890         int    rc;
2891
2892         rc = kgnilnd_tunables_init();
2893         if (rc != 0)
2894                 return rc;
2895
2896         printk(KERN_INFO "Lustre: kgnilnd build version: "KGNILND_BUILD_REV"\n");
2897
2898         kgnilnd_insert_sysctl();
2899         kgnilnd_proc_init();
2900
2901         lnet_register_lnd(&the_kgnilnd);
2902
2903         return 0;
2904 }
2905
2906 MODULE_AUTHOR("Cray, Inc. <nic@cray.com>");
2907 MODULE_DESCRIPTION("Gemini LNet Network Driver");
2908 MODULE_VERSION(KGNILND_BUILD_REV);
2909 MODULE_LICENSE("GPL");
2910
2911 module_init(kgnilnd_init);
2912 module_exit(kgnilnd_exit);