lnet/klnds/o2iblnd/o2iblnd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lnet/klnds/o2iblnd/o2iblnd.c
  32  *
  33  * Author: Eric Barton <eric@bartonsoftware.com>
  34  */
  35
  36 #include <asm/page.h>
  37 #include <linux/ethtool.h>
  38 #include <linux/inetdevice.h>
  39
  40 #include "o2iblnd.h"
  41
  42 static const struct lnet_lnd the_o2iblnd;
  43
  44 struct kib_data kiblnd_data;
  45
  46 static __u32
  47 kiblnd_cksum (void *ptr, int nob)
  48 {
  49         char  *c  = ptr;
  50         __u32  sum = 0;
  51
  52         while (nob-- > 0)
  53                 sum = ((sum << 1) | (sum >> 31)) + *c++;
  54
  55         /* ensure I don't return 0 (== no checksum) */
  56         return (sum == 0) ? 1 : sum;
  57 }
  58
  59 static char *
  60 kiblnd_msgtype2str(int type)
  61 {
  62         switch (type) {
  63         case IBLND_MSG_CONNREQ:
  64                 return "CONNREQ";
  65
  66         case IBLND_MSG_CONNACK:
  67                 return "CONNACK";
  68
  69         case IBLND_MSG_NOOP:
  70                 return "NOOP";
  71
  72         case IBLND_MSG_IMMEDIATE:
  73                 return "IMMEDIATE";
  74
  75         case IBLND_MSG_PUT_REQ:
  76                 return "PUT_REQ";
  77
  78         case IBLND_MSG_PUT_NAK:
  79                 return "PUT_NAK";
  80
  81         case IBLND_MSG_PUT_ACK:
  82                 return "PUT_ACK";
  83
  84         case IBLND_MSG_PUT_DONE:
  85                 return "PUT_DONE";
  86
  87         case IBLND_MSG_GET_REQ:
  88                 return "GET_REQ";
  89
  90         case IBLND_MSG_GET_DONE:
  91                 return "GET_DONE";
  92
  93         default:
  94                 return "???";
  95         }
  96 }
  97
  98 static int
  99 kiblnd_msgtype2size(int type)
 100 {
 101         const int hdr_size = offsetof(struct kib_msg, ibm_u);
 102
 103         switch (type) {
 104         case IBLND_MSG_CONNREQ:
 105         case IBLND_MSG_CONNACK:
 106                 return hdr_size + sizeof(struct kib_connparams);
 107
 108         case IBLND_MSG_NOOP:
 109                 return hdr_size;
 110
 111         case IBLND_MSG_IMMEDIATE:
 112                 return offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[0]);
 113
 114         case IBLND_MSG_PUT_REQ:
 115                 return hdr_size + sizeof(struct kib_putreq_msg);
 116
 117         case IBLND_MSG_PUT_ACK:
 118                 return hdr_size + sizeof(struct kib_putack_msg);
 119
 120         case IBLND_MSG_GET_REQ:
 121                 return hdr_size + sizeof(struct kib_get_msg);
 122
 123         case IBLND_MSG_PUT_NAK:
 124         case IBLND_MSG_PUT_DONE:
 125         case IBLND_MSG_GET_DONE:
 126                 return hdr_size + sizeof(struct kib_completion_msg);
 127         default:
 128                 return -1;
 129         }
 130 }
 131
 132 static int kiblnd_unpack_rd(struct kib_msg *msg, bool flip)
 133 {
 134         struct kib_rdma_desc *rd;
 135         int nob;
 136         int n;
 137         int i;
 138
 139         LASSERT(msg->ibm_type == IBLND_MSG_GET_REQ ||
 140                 msg->ibm_type == IBLND_MSG_PUT_ACK);
 141
 142         rd = msg->ibm_type == IBLND_MSG_GET_REQ ?
 143                 &msg->ibm_u.get.ibgm_rd :
 144                 &msg->ibm_u.putack.ibpam_rd;
 145
 146         if (flip) {
 147                 __swab32s(&rd->rd_key);
 148                 __swab32s(&rd->rd_nfrags);
 149         }
 150
 151         n = rd->rd_nfrags;
 152
 153         if (n <= 0 || n > IBLND_MAX_RDMA_FRAGS) {
 154                 CERROR("Bad nfrags: %d, should be 0 < n <= %d\n",
 155                        n, IBLND_MAX_RDMA_FRAGS);
 156                 return 1;
 157         }
 158
 159         nob = offsetof(struct kib_msg, ibm_u) +
 160                 kiblnd_rd_msg_size(rd, msg->ibm_type, n);
 161
 162         if (msg->ibm_nob < nob) {
 163                 CERROR("Short %s: %d(%d)\n",
 164                        kiblnd_msgtype2str(msg->ibm_type), msg->ibm_nob, nob);
 165                 return 1;
 166         }
 167
 168         if (!flip)
 169                 return 0;
 170
 171         for (i = 0; i < n; i++) {
 172                 __swab32s(&rd->rd_frags[i].rf_nob);
 173                 __swab64s(&rd->rd_frags[i].rf_addr);
 174         }
 175
 176         return 0;
 177 }
 178
 179 void kiblnd_pack_msg(struct lnet_ni *ni, struct kib_msg *msg, int version,
 180                      int credits, lnet_nid_t dstnid, __u64 dststamp)
 181 {
 182         struct kib_net *net = ni->ni_data;
 183
 184         /* CAVEAT EMPTOR! all message fields not set here should have been
 185          * initialised previously.
 186          */
 187         msg->ibm_magic    = IBLND_MSG_MAGIC;
 188         msg->ibm_version  = version;
 189         /*   ibm_type */
 190         msg->ibm_credits  = credits;
 191         /*   ibm_nob */
 192         msg->ibm_cksum    = 0;
 193         msg->ibm_srcnid   = lnet_nid_to_nid4(&ni->ni_nid);
 194         msg->ibm_srcstamp = net->ibn_incarnation;
 195         msg->ibm_dstnid   = dstnid;
 196         msg->ibm_dststamp = dststamp;
 197
 198         if (*kiblnd_tunables.kib_cksum) {
 199                 /* NB ibm_cksum zero while computing cksum */
 200                 msg->ibm_cksum = kiblnd_cksum(msg, msg->ibm_nob);
 201         }
 202 }
 203
 204 int kiblnd_unpack_msg(struct kib_msg *msg, int nob)
 205 {
 206         const int hdr_size = offsetof(struct kib_msg, ibm_u);
 207         __u32 msg_cksum;
 208         __u16 version;
 209         int msg_nob;
 210         bool flip;
 211
 212         /* 6 bytes are enough to have received magic + version */
 213         if (nob < 6) {
 214                 CERROR("Short message: %d\n", nob);
 215                 return -EPROTO;
 216         }
 217
 218         if (msg->ibm_magic == IBLND_MSG_MAGIC) {
 219                 flip = false;
 220         } else if (msg->ibm_magic == __swab32(IBLND_MSG_MAGIC)) {
 221                 flip = true;
 222         } else {
 223                 CERROR("Bad magic: %08x\n", msg->ibm_magic);
 224                 return -EPROTO;
 225         }
 226
 227         version = flip ? __swab16(msg->ibm_version) : msg->ibm_version;
 228         if (version != IBLND_MSG_VERSION &&
 229             version != IBLND_MSG_VERSION_1) {
 230                 CERROR("Bad version: %x\n", version);
 231                 return -EPROTO;
 232         }
 233
 234         if (nob < hdr_size) {
 235                 CERROR("Short message: %d\n", nob);
 236                 return -EPROTO;
 237         }
 238
 239         msg_nob = flip ? __swab32(msg->ibm_nob) : msg->ibm_nob;
 240         if (msg_nob > nob) {
 241                 CERROR("Short message: got %d, wanted %d\n", nob, msg_nob);
 242                 return -EPROTO;
 243         }
 244
 245         /* checksum must be computed with ibm_cksum zero and BEFORE anything
 246          * gets flipped
 247          */
 248         msg_cksum = flip ? __swab32(msg->ibm_cksum) : msg->ibm_cksum;
 249         msg->ibm_cksum = 0;
 250         if (msg_cksum != 0 &&
 251             msg_cksum != kiblnd_cksum(msg, msg_nob)) {
 252                 CERROR("Bad checksum\n");
 253                 return -EPROTO;
 254         }
 255
 256         msg->ibm_cksum = msg_cksum;
 257
 258         if (flip) {
 259                 /* leave magic unflipped as a clue to peer_ni endianness */
 260                 msg->ibm_version = version;
 261                 BUILD_BUG_ON(sizeof(msg->ibm_type) != 1);
 262                 BUILD_BUG_ON(sizeof(msg->ibm_credits) != 1);
 263                 msg->ibm_nob     = msg_nob;
 264                 __swab64s(&msg->ibm_srcnid);
 265                 __swab64s(&msg->ibm_srcstamp);
 266                 __swab64s(&msg->ibm_dstnid);
 267                 __swab64s(&msg->ibm_dststamp);
 268         }
 269
 270         if (msg->ibm_srcnid == LNET_NID_ANY) {
 271                 CERROR("Bad src nid: %s\n", libcfs_nid2str(msg->ibm_srcnid));
 272                 return -EPROTO;
 273         }
 274
 275         if (msg_nob < kiblnd_msgtype2size(msg->ibm_type)) {
 276                 CERROR("Short %s: %d(%d)\n", kiblnd_msgtype2str(msg->ibm_type),
 277                        msg_nob, kiblnd_msgtype2size(msg->ibm_type));
 278                 return -EPROTO;
 279         }
 280
 281         switch (msg->ibm_type) {
 282         default:
 283                 CERROR("Unknown message type %x\n", msg->ibm_type);
 284                 return -EPROTO;
 285
 286         case IBLND_MSG_NOOP:
 287         case IBLND_MSG_IMMEDIATE:
 288         case IBLND_MSG_PUT_REQ:
 289                 break;
 290
 291         case IBLND_MSG_PUT_ACK:
 292         case IBLND_MSG_GET_REQ:
 293                 if (kiblnd_unpack_rd(msg, flip))
 294                         return -EPROTO;
 295                 break;
 296
 297         case IBLND_MSG_PUT_NAK:
 298         case IBLND_MSG_PUT_DONE:
 299         case IBLND_MSG_GET_DONE:
 300                 if (flip)
 301                         __swab32s(&msg->ibm_u.completion.ibcm_status);
 302                 break;
 303
 304         case IBLND_MSG_CONNREQ:
 305         case IBLND_MSG_CONNACK:
 306                 if (flip) {
 307                         __swab16s(&msg->ibm_u.connparams.ibcp_queue_depth);
 308                         __swab16s(&msg->ibm_u.connparams.ibcp_max_frags);
 309                         __swab32s(&msg->ibm_u.connparams.ibcp_max_msg_size);
 310                 }
 311                 break;
 312         }
 313         return 0;
 314 }
 315
 316 int
 317 kiblnd_create_peer(struct lnet_ni *ni, struct kib_peer_ni **peerp,
 318                    lnet_nid_t nid)
 319 {
 320         struct kib_peer_ni *peer_ni;
 321         struct kib_net *net = ni->ni_data;
 322         int cpt = lnet_cpt_of_nid(nid, ni);
 323         unsigned long flags;
 324
 325         LASSERT(net != NULL);
 326         LASSERT(nid != LNET_NID_ANY);
 327
 328         LIBCFS_CPT_ALLOC(peer_ni, lnet_cpt_table(), cpt, sizeof(*peer_ni));
 329         if (!peer_ni) {
 330                 CERROR("Cannot allocate peer_ni\n");
 331                 return -ENOMEM;
 332         }
 333
 334         peer_ni->ibp_ni = ni;
 335         peer_ni->ibp_nid = nid;
 336         peer_ni->ibp_error = 0;
 337         peer_ni->ibp_last_alive = 0;
 338         peer_ni->ibp_max_frags = IBLND_MAX_RDMA_FRAGS;
 339         peer_ni->ibp_queue_depth = ni->ni_net->net_tunables.lct_peer_tx_credits;
 340         peer_ni->ibp_queue_depth_mod = 0;       /* try to use the default */
 341         kref_init(&peer_ni->ibp_kref);
 342         atomic_set(&peer_ni->ibp_nconns, 0);
 343
 344         INIT_HLIST_NODE(&peer_ni->ibp_list);
 345         INIT_LIST_HEAD(&peer_ni->ibp_conns);
 346         INIT_LIST_HEAD(&peer_ni->ibp_tx_queue);
 347
 348         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 349
 350         /* always called with a ref on ni, which prevents ni being shutdown */
 351         LASSERT(net->ibn_shutdown == 0);
 352
 353         /* npeers only grows with the global lock held */
 354         atomic_inc(&net->ibn_npeers);
 355
 356         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 357
 358         *peerp = peer_ni;
 359         return 0;
 360 }
 361
 362 void
 363 kiblnd_destroy_peer(struct kref *kref)
 364 {
 365         struct kib_peer_ni *peer_ni = container_of(kref, struct kib_peer_ni,
 366                                                    ibp_kref);
 367         struct kib_net *net = peer_ni->ibp_ni->ni_data;
 368
 369         LASSERT(net != NULL);
 370         LASSERT(!kiblnd_peer_active(peer_ni));
 371         LASSERT(kiblnd_peer_idle(peer_ni));
 372         LASSERT(list_empty(&peer_ni->ibp_tx_queue));
 373
 374         LIBCFS_FREE(peer_ni, sizeof(*peer_ni));
 375
 376         /* NB a peer_ni's connections keep a reference on their peer_ni until
 377          * they are destroyed, so we can be assured that _all_ state to do
 378          * with this peer_ni has been cleaned up when its refcount drops to
 379          * zero.
 380          */
 381         if (atomic_dec_and_test(&net->ibn_npeers))
 382                 wake_up_var(&net->ibn_npeers);
 383 }
 384
 385 struct kib_peer_ni *
 386 kiblnd_find_peer_locked(struct lnet_ni *ni, lnet_nid_t nid)
 387 {
 388         /* the caller is responsible for accounting the additional reference
 389          * that this creates
 390          */
 391         struct kib_peer_ni *peer_ni;
 392
 393         hash_for_each_possible(kiblnd_data.kib_peers, peer_ni,
 394                                ibp_list, nid) {
 395                 LASSERT(!kiblnd_peer_idle(peer_ni));
 396
 397                 /*
 398                  * Match a peer if its NID and the NID of the local NI it
 399                  * communicates over are the same. Otherwise don't match
 400                  * the peer, which will result in a new lnd peer being
 401                  * created.
 402                  */
 403                 if (peer_ni->ibp_nid != nid ||
 404                     !nid_same(&peer_ni->ibp_ni->ni_nid, &ni->ni_nid))
 405                         continue;
 406
 407                 CDEBUG(D_NET, "got peer_ni [%p] -> %s (%d) version: %x\n",
 408                        peer_ni, libcfs_nid2str(nid),
 409                        kref_read(&peer_ni->ibp_kref),
 410                        peer_ni->ibp_version);
 411                 return peer_ni;
 412         }
 413         return NULL;
 414 }
 415
 416 void
 417 kiblnd_unlink_peer_locked(struct kib_peer_ni *peer_ni)
 418 {
 419         LASSERT(list_empty(&peer_ni->ibp_conns));
 420
 421         LASSERT(kiblnd_peer_active(peer_ni));
 422         hlist_del_init(&peer_ni->ibp_list);
 423         /* lose peerlist's ref */
 424         kiblnd_peer_decref(peer_ni);
 425 }
 426
 427
 428 static void
 429 kiblnd_debug_rx(struct kib_rx *rx)
 430 {
 431         CDEBUG(D_CONSOLE, "      %p msg_type %x cred %d\n",
 432                rx, rx->rx_msg->ibm_type,
 433                rx->rx_msg->ibm_credits);
 434 }
 435
 436 static void
 437 kiblnd_debug_tx(struct kib_tx *tx)
 438 {
 439         CDEBUG(D_CONSOLE, "      %p snd %d q %d w %d rc %d dl %lld "
 440                "cookie %#llx msg %s%s type %x cred %d\n",
 441                tx, tx->tx_sending, tx->tx_queued, tx->tx_waiting,
 442                tx->tx_status, ktime_to_ns(tx->tx_deadline), tx->tx_cookie,
 443                tx->tx_lntmsg[0] == NULL ? "-" : "!",
 444                tx->tx_lntmsg[1] == NULL ? "-" : "!",
 445                tx->tx_msg->ibm_type, tx->tx_msg->ibm_credits);
 446 }
 447
 448 static void
 449 kiblnd_debug_conn(struct kib_conn *conn)
 450 {
 451         struct list_head        *tmp;
 452         int                     i;
 453
 454         spin_lock(&conn->ibc_lock);
 455
 456         CDEBUG(D_CONSOLE, "conn[%d] %p [version %x] -> %s:\n",
 457                atomic_read(&conn->ibc_refcount), conn,
 458                conn->ibc_version, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 459         CDEBUG(D_CONSOLE, "   state %d nposted %d/%d cred %d o_cred %d "
 460                " r_cred %d\n", conn->ibc_state, conn->ibc_noops_posted,
 461                conn->ibc_nsends_posted, conn->ibc_credits,
 462                conn->ibc_outstanding_credits, conn->ibc_reserved_credits);
 463         CDEBUG(D_CONSOLE, "   comms_err %d\n", conn->ibc_comms_error);
 464
 465         CDEBUG(D_CONSOLE, "   early_rxs:\n");
 466         list_for_each(tmp, &conn->ibc_early_rxs)
 467                 kiblnd_debug_rx(list_entry(tmp, struct kib_rx, rx_list));
 468
 469         CDEBUG(D_CONSOLE, "   tx_noops:\n");
 470         list_for_each(tmp, &conn->ibc_tx_noops)
 471                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 472
 473         CDEBUG(D_CONSOLE, "   tx_queue_nocred:\n");
 474         list_for_each(tmp, &conn->ibc_tx_queue_nocred)
 475                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 476
 477         CDEBUG(D_CONSOLE, "   tx_queue_rsrvd:\n");
 478         list_for_each(tmp, &conn->ibc_tx_queue_rsrvd)
 479                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 480
 481         CDEBUG(D_CONSOLE, "   tx_queue:\n");
 482         list_for_each(tmp, &conn->ibc_tx_queue)
 483                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 484
 485         CDEBUG(D_CONSOLE, "   active_txs:\n");
 486         list_for_each(tmp, &conn->ibc_active_txs)
 487                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 488
 489         CDEBUG(D_CONSOLE, "   rxs:\n");
 490         for (i = 0; i < IBLND_RX_MSGS(conn); i++)
 491                 kiblnd_debug_rx(&conn->ibc_rxs[i]);
 492
 493         spin_unlock(&conn->ibc_lock);
 494 }
 495
 496 static void
 497 kiblnd_dump_peer_debug_info(struct kib_peer_ni *peer_ni)
 498 {
 499         struct kib_conn *conn;
 500         struct kib_conn *cnxt;
 501         int count = 0;
 502
 503         CDEBUG(D_CONSOLE, "[last_alive, races, reconnected, error]: %lld, %d, %d, %d\n",
 504                peer_ni->ibp_last_alive,
 505                peer_ni->ibp_races,
 506                peer_ni->ibp_reconnected,
 507                peer_ni->ibp_error);
 508         list_for_each_entry_safe(conn, cnxt, &peer_ni->ibp_conns,
 509                                  ibc_list) {
 510                 CDEBUG(D_CONSOLE, "Conn %d:\n", count);
 511                 kiblnd_debug_conn(conn);
 512                 count++;
 513         }
 514 }
 515
 516
 517 static int
 518 kiblnd_get_peer_info(struct lnet_ni *ni, lnet_nid_t nid, int index,
 519                      lnet_nid_t *nidp, int *count)
 520 {
 521         struct kib_peer_ni              *peer_ni;
 522         int                      i;
 523         unsigned long            flags;
 524
 525         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 526
 527         hash_for_each(kiblnd_data.kib_peers, i, peer_ni, ibp_list) {
 528                 LASSERT(!kiblnd_peer_idle(peer_ni));
 529
 530                 if (peer_ni->ibp_ni != ni)
 531                         continue;
 532
 533                 if (peer_ni->ibp_nid == nid)
 534                         kiblnd_dump_peer_debug_info(peer_ni);
 535
 536                 if (index-- > 0)
 537                         continue;
 538
 539                 *nidp = peer_ni->ibp_nid;
 540                 *count = kref_read(&peer_ni->ibp_kref);
 541
 542                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 543                 return 0;
 544         }
 545
 546         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 547         return -ENOENT;
 548 }
 549
 550 static void
 551 kiblnd_del_peer_locked(struct kib_peer_ni *peer_ni)
 552 {
 553         struct kib_conn *cnxt;
 554         struct kib_conn *conn;
 555
 556         if (list_empty(&peer_ni->ibp_conns)) {
 557                 kiblnd_unlink_peer_locked(peer_ni);
 558         } else {
 559                 list_for_each_entry_safe(conn, cnxt, &peer_ni->ibp_conns,
 560                                          ibc_list)
 561                         kiblnd_close_conn_locked(conn, 0);
 562                 /* NB closing peer_ni's last conn unlinked it. */
 563         }
 564         /* NB peer_ni now unlinked; might even be freed if the peer_ni table had the
 565          * last ref on it. */
 566 }
 567
 568 static int
 569 kiblnd_del_peer(struct lnet_ni *ni, lnet_nid_t nid)
 570 {
 571         LIST_HEAD(zombies);
 572         struct hlist_node *pnxt;
 573         struct kib_peer_ni *peer_ni;
 574         int lo;
 575         int hi;
 576         int i;
 577         unsigned long flags;
 578         int rc = -ENOENT;
 579
 580         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 581
 582         if (nid != LNET_NID_ANY) {
 583                 lo = hash_min(nid, HASH_BITS(kiblnd_data.kib_peers));
 584                 hi = lo;
 585         } else {
 586                 lo = 0;
 587                 hi = HASH_SIZE(kiblnd_data.kib_peers) - 1;
 588         }
 589
 590         for (i = lo; i <= hi; i++) {
 591                 hlist_for_each_entry_safe(peer_ni, pnxt,
 592                                           &kiblnd_data.kib_peers[i], ibp_list) {
 593                         LASSERT(!kiblnd_peer_idle(peer_ni));
 594
 595                         if (peer_ni->ibp_ni != ni)
 596                                 continue;
 597
 598                         if (!(nid == LNET_NID_ANY || peer_ni->ibp_nid == nid))
 599                                 continue;
 600
 601                         if (!list_empty(&peer_ni->ibp_tx_queue)) {
 602                                 LASSERT(list_empty(&peer_ni->ibp_conns));
 603
 604                                 list_splice_init(&peer_ni->ibp_tx_queue,
 605                                                  &zombies);
 606                         }
 607
 608                         kiblnd_del_peer_locked(peer_ni);
 609                         rc = 0;         /* matched something */
 610                 }
 611         }
 612
 613         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 614
 615         kiblnd_txlist_done(&zombies, -EIO, LNET_MSG_STATUS_LOCAL_ERROR);
 616
 617         return rc;
 618 }
 619
 620 static struct kib_conn *
 621 kiblnd_get_conn_by_idx(struct lnet_ni *ni, int index)
 622 {
 623         struct kib_peer_ni *peer_ni;
 624         struct kib_conn *conn;
 625         int i;
 626         unsigned long flags;
 627
 628         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 629
 630         hash_for_each(kiblnd_data.kib_peers, i, peer_ni, ibp_list) {
 631                 LASSERT(!kiblnd_peer_idle(peer_ni));
 632
 633                 if (peer_ni->ibp_ni != ni)
 634                         continue;
 635
 636                 list_for_each_entry(conn, &peer_ni->ibp_conns,
 637                                     ibc_list) {
 638                         if (index-- > 0)
 639                                 continue;
 640
 641                         kiblnd_conn_addref(conn);
 642                         read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
 643                                                flags);
 644                         return conn;
 645                 }
 646         }
 647
 648         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 649         return NULL;
 650 }
 651
 652 static void
 653 kiblnd_setup_mtu_locked(struct rdma_cm_id *cmid)
 654 {
 655         /* XXX There is no path record for iWARP, set by netdev->change_mtu? */
 656         if (cmid->route.path_rec == NULL)
 657                 return;
 658
 659         if (*kiblnd_tunables.kib_ib_mtu)
 660                 cmid->route.path_rec->mtu =
 661                         ib_mtu_int_to_enum(*kiblnd_tunables.kib_ib_mtu);
 662 }
 663
 664 static int
 665 kiblnd_get_completion_vector(struct kib_conn *conn, int cpt)
 666 {
 667         cpumask_var_t   *mask;
 668         int             vectors;
 669         int             off;
 670         int             i;
 671         lnet_nid_t      ibp_nid;
 672
 673         vectors = conn->ibc_cmid->device->num_comp_vectors;
 674         if (vectors <= 1)
 675                 return 0;
 676
 677         mask = cfs_cpt_cpumask(lnet_cpt_table(), cpt);
 678
 679         /* hash NID to CPU id in this partition... when targeting a single peer
 680          * with multiple QPs, to engage more cores in CQ processing to a single
 681          * peer, use ibp_nconns to salt the value the comp_vector value
 682          */
 683         ibp_nid = conn->ibc_peer->ibp_nid +
 684                 atomic_read(&conn->ibc_peer->ibp_nconns);
 685         off = do_div(ibp_nid, cpumask_weight(*mask));
 686         for_each_cpu(i, *mask) {
 687                 if (off-- == 0)
 688                         return i % vectors;
 689         }
 690
 691         LBUG();
 692         return 1;
 693 }
 694
 695 /*
 696  * Get the scheduler bound to this CPT. If the scheduler has no
 697  * threads, which means that the CPT has no CPUs, then grab the
 698  * next scheduler that we can use.
 699  *
 700  * This case would be triggered if a NUMA node is configured with
 701  * no associated CPUs.
 702  */
 703 static struct kib_sched_info *
 704 kiblnd_get_scheduler(int cpt)
 705 {
 706         struct kib_sched_info *sched;
 707         int i;
 708
 709         sched = kiblnd_data.kib_scheds[cpt];
 710
 711         if (sched->ibs_nthreads > 0)
 712                 return sched;
 713
 714         cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
 715                 if (sched->ibs_nthreads > 0) {
 716                         CDEBUG(D_NET, "scheduler[%d] has no threads. selected scheduler[%d]\n",
 717                                         cpt, sched->ibs_cpt);
 718                         return sched;
 719                 }
 720         }
 721
 722         return NULL;
 723 }
 724
 725 static unsigned int kiblnd_send_wrs(struct kib_conn *conn)
 726 {
 727         /*
 728          * One WR for the LNet message
 729          * And ibc_max_frags for the transfer WRs
 730          */
 731         int ret;
 732         int multiplier = 1 + conn->ibc_max_frags;
 733
 734         /* FastReg needs two extra WRs for map and invalidate */
 735         if (IS_FAST_REG_DEV(conn->ibc_hdev->ibh_dev))
 736                 multiplier += 2;
 737
 738         /* account for a maximum of ibc_queue_depth in-flight transfers */
 739         ret = multiplier * conn->ibc_queue_depth;
 740
 741         if (ret > conn->ibc_hdev->ibh_max_qp_wr) {
 742                 CDEBUG(D_NET, "peer_credits %u will result in send work "
 743                        "request size %d larger than maximum %d device "
 744                        "can handle\n", conn->ibc_queue_depth, ret,
 745                        conn->ibc_hdev->ibh_max_qp_wr);
 746                 conn->ibc_queue_depth =
 747                         conn->ibc_hdev->ibh_max_qp_wr / multiplier;
 748         }
 749
 750         /* don't go beyond the maximum the device can handle */
 751         return min(ret, conn->ibc_hdev->ibh_max_qp_wr);
 752 }
 753
 754 struct kib_conn *
 755 kiblnd_create_conn(struct kib_peer_ni *peer_ni, struct rdma_cm_id *cmid,
 756                    int state, int version)
 757 {
 758         /* CAVEAT EMPTOR:
 759          * If the new conn is created successfully it takes over the caller's
 760          * ref on 'peer_ni'.  It also "owns" 'cmid' and destroys it when it itself
 761          * is destroyed.  On failure, the caller's ref on 'peer_ni' remains and
 762          * she must dispose of 'cmid'.  (Actually I'd block forever if I tried
 763          * to destroy 'cmid' here since I'm called from the CM which still has
 764          * its ref on 'cmid'). */
 765         rwlock_t               *glock = &kiblnd_data.kib_global_lock;
 766         struct kib_net              *net = peer_ni->ibp_ni->ni_data;
 767         struct kib_dev *dev;
 768         struct ib_qp_init_attr init_qp_attr = {};
 769         struct kib_sched_info   *sched;
 770 #ifdef HAVE_IB_CQ_INIT_ATTR
 771         struct ib_cq_init_attr  cq_attr = {};
 772 #endif
 773         struct kib_conn *conn;
 774         struct ib_cq            *cq;
 775         unsigned long           flags;
 776         int                     cpt;
 777         int                     rc;
 778         int                     i;
 779
 780         LASSERT(net != NULL);
 781         LASSERT(!in_interrupt());
 782
 783         dev = net->ibn_dev;
 784
 785         cpt = lnet_cpt_of_nid(peer_ni->ibp_nid, peer_ni->ibp_ni);
 786         sched = kiblnd_get_scheduler(cpt);
 787
 788         if (sched == NULL) {
 789                 CERROR("no schedulers available. node is unhealthy\n");
 790                 goto failed_0;
 791         }
 792
 793         /*
 794          * The cpt might have changed if we ended up selecting a non cpt
 795          * native scheduler. So use the scheduler's cpt instead.
 796          */
 797         cpt = sched->ibs_cpt;
 798
 799         LIBCFS_CPT_ALLOC(conn, lnet_cpt_table(), cpt, sizeof(*conn));
 800         if (conn == NULL) {
 801                 CERROR("Can't allocate connection for %s\n",
 802                        libcfs_nid2str(peer_ni->ibp_nid));
 803                 goto failed_0;
 804         }
 805
 806         conn->ibc_state = IBLND_CONN_INIT;
 807         conn->ibc_version = version;
 808         conn->ibc_peer = peer_ni;                       /* I take the caller's ref */
 809         cmid->context = conn;                   /* for future CM callbacks */
 810         conn->ibc_cmid = cmid;
 811         conn->ibc_max_frags = peer_ni->ibp_max_frags;
 812         conn->ibc_queue_depth = peer_ni->ibp_queue_depth;
 813         conn->ibc_rxs = NULL;
 814         conn->ibc_rx_pages = NULL;
 815
 816         INIT_LIST_HEAD(&conn->ibc_early_rxs);
 817         INIT_LIST_HEAD(&conn->ibc_tx_noops);
 818         INIT_LIST_HEAD(&conn->ibc_tx_queue);
 819         INIT_LIST_HEAD(&conn->ibc_tx_queue_rsrvd);
 820         INIT_LIST_HEAD(&conn->ibc_tx_queue_nocred);
 821         INIT_LIST_HEAD(&conn->ibc_active_txs);
 822         INIT_LIST_HEAD(&conn->ibc_zombie_txs);
 823         spin_lock_init(&conn->ibc_lock);
 824
 825         LIBCFS_CPT_ALLOC(conn->ibc_connvars, lnet_cpt_table(), cpt,
 826                          sizeof(*conn->ibc_connvars));
 827         if (conn->ibc_connvars == NULL) {
 828                 CERROR("Can't allocate in-progress connection state\n");
 829                 goto failed_2;
 830         }
 831
 832         write_lock_irqsave(glock, flags);
 833         if (dev->ibd_failover) {
 834                 write_unlock_irqrestore(glock, flags);
 835                 CERROR("%s: failover in progress\n", dev->ibd_ifname);
 836                 goto failed_2;
 837         }
 838
 839         if (dev->ibd_hdev->ibh_ibdev != cmid->device) {
 840                 /* wakeup failover thread and teardown connection */
 841                 if (kiblnd_dev_can_failover(dev)) {
 842                         list_add_tail(&dev->ibd_fail_list,
 843                                       &kiblnd_data.kib_failed_devs);
 844                         wake_up(&kiblnd_data.kib_failover_waitq);
 845                 }
 846
 847                 write_unlock_irqrestore(glock, flags);
 848                 CERROR("cmid HCA(%s), kib_dev(%s) need failover\n",
 849                        cmid->device->name, dev->ibd_ifname);
 850                 goto failed_2;
 851         }
 852
 853         kiblnd_hdev_addref_locked(dev->ibd_hdev);
 854         conn->ibc_hdev = dev->ibd_hdev;
 855
 856         kiblnd_setup_mtu_locked(cmid);
 857
 858         write_unlock_irqrestore(glock, flags);
 859
 860 #ifdef HAVE_IB_CQ_INIT_ATTR
 861         cq_attr.cqe = IBLND_CQ_ENTRIES(conn);
 862         cq_attr.comp_vector = kiblnd_get_completion_vector(conn, cpt);
 863         cq = ib_create_cq(cmid->device,
 864                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 865                           &cq_attr);
 866 #else
 867         cq = ib_create_cq(cmid->device,
 868                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 869                           IBLND_CQ_ENTRIES(conn),
 870                           kiblnd_get_completion_vector(conn, cpt));
 871 #endif
 872         if (IS_ERR(cq)) {
 873                 /*
 874                  * on MLX-5 (possibly MLX-4 as well) this error could be
 875                  * hit if the concurrent_sends and/or peer_tx_credits is set
 876                  * too high. Or due to an MLX-5 bug which tries to
 877                  * allocate 256kb via kmalloc for WR cookie array
 878                  */
 879                 CERROR("Failed to create CQ with %d CQEs: %ld\n",
 880                         IBLND_CQ_ENTRIES(conn), PTR_ERR(cq));
 881                 goto failed_2;
 882         }
 883
 884         conn->ibc_cq = cq;
 885
 886         rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 887         if (rc != 0) {
 888                 CERROR("Can't request completion notification: %d\n", rc);
 889                 goto failed_2;
 890         }
 891
 892         init_qp_attr.event_handler = kiblnd_qp_event;
 893         init_qp_attr.qp_context = conn;
 894         init_qp_attr.cap.max_send_sge = *kiblnd_tunables.kib_wrq_sge;
 895         init_qp_attr.cap.max_recv_sge = 1;
 896         init_qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 897         init_qp_attr.qp_type = IB_QPT_RC;
 898         init_qp_attr.send_cq = cq;
 899         init_qp_attr.recv_cq = cq;
 900
 901         if (peer_ni->ibp_queue_depth_mod &&
 902             peer_ni->ibp_queue_depth_mod < peer_ni->ibp_queue_depth) {
 903                 conn->ibc_queue_depth = peer_ni->ibp_queue_depth_mod;
 904                 CDEBUG(D_NET, "Use reduced queue depth %u (from %u)\n",
 905                        peer_ni->ibp_queue_depth_mod,
 906                        peer_ni->ibp_queue_depth);
 907         }
 908
 909         do {
 910                 /* kiblnd_send_wrs() can change the connection's queue depth if
 911                  * the maximum work requests for the device is maxed out
 912                  */
 913                 init_qp_attr.cap.max_send_wr = kiblnd_send_wrs(conn);
 914                 init_qp_attr.cap.max_recv_wr = IBLND_RECV_WRS(conn);
 915                 rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd,
 916                                     &init_qp_attr);
 917                 if (rc != -ENOMEM || conn->ibc_queue_depth < 2)
 918                         break;
 919                 conn->ibc_queue_depth--;
 920         } while (rc);
 921
 922         if (rc) {
 923                 CERROR("Can't create QP: %d, send_wr: %d, recv_wr: %d, "
 924                        "send_sge: %d, recv_sge: %d\n",
 925                        rc, init_qp_attr.cap.max_send_wr,
 926                        init_qp_attr.cap.max_recv_wr,
 927                        init_qp_attr.cap.max_send_sge,
 928                        init_qp_attr.cap.max_recv_sge);
 929                 goto failed_2;
 930         }
 931
 932         conn->ibc_sched = sched;
 933
 934         if (!peer_ni->ibp_queue_depth_mod &&
 935             conn->ibc_queue_depth != peer_ni->ibp_queue_depth) {
 936                 CWARN("peer %s - queue depth reduced from %u to %u"
 937                       "  to allow for qp creation\n",
 938                       libcfs_nid2str(peer_ni->ibp_nid),
 939                       peer_ni->ibp_queue_depth,
 940                       conn->ibc_queue_depth);
 941                 peer_ni->ibp_queue_depth_mod = conn->ibc_queue_depth;
 942         }
 943
 944         LIBCFS_CPT_ALLOC(conn->ibc_rxs, lnet_cpt_table(), cpt,
 945                          IBLND_RX_MSGS(conn) * sizeof(struct kib_rx));
 946         if (conn->ibc_rxs == NULL) {
 947                 CERROR("Cannot allocate RX buffers\n");
 948                 goto failed_2;
 949         }
 950
 951         rc = kiblnd_alloc_pages(&conn->ibc_rx_pages, cpt,
 952                                 IBLND_RX_MSG_PAGES(conn));
 953         if (rc != 0)
 954                 goto failed_2;
 955
 956         kiblnd_map_rx_descs(conn);
 957
 958         /* 1 ref for caller and each rxmsg */
 959         atomic_set(&conn->ibc_refcount, 1 + IBLND_RX_MSGS(conn));
 960         conn->ibc_nrx = IBLND_RX_MSGS(conn);
 961
 962         /* post receives */
 963         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
 964                 rc = kiblnd_post_rx(&conn->ibc_rxs[i], IBLND_POSTRX_NO_CREDIT);
 965                 if (rc != 0) {
 966                         CERROR("Can't post rxmsg: %d\n", rc);
 967
 968                         /* Make posted receives complete */
 969                         kiblnd_abort_receives(conn);
 970
 971                         /* correct # of posted buffers
 972                          * NB locking needed now I'm racing with completion */
 973                         spin_lock_irqsave(&sched->ibs_lock, flags);
 974                         conn->ibc_nrx -= IBLND_RX_MSGS(conn) - i;
 975                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
 976
 977                         /* cmid will be destroyed by CM(ofed) after cm_callback
 978                          * returned, so we can't refer it anymore
 979                          * (by kiblnd_connd()->kiblnd_destroy_conn) */
 980                         rdma_destroy_qp(conn->ibc_cmid);
 981                         conn->ibc_cmid = NULL;
 982
 983                         /* Drop my own and unused rxbuffer refcounts */
 984                         while (i++ <= IBLND_RX_MSGS(conn))
 985                                 kiblnd_conn_decref(conn);
 986
 987                         return NULL;
 988                 }
 989         }
 990
 991         /* Init successful! */
 992         LASSERT (state == IBLND_CONN_ACTIVE_CONNECT ||
 993                  state == IBLND_CONN_PASSIVE_WAIT);
 994         conn->ibc_state = state;
 995
 996         /* 1 more conn */
 997         atomic_inc(&peer_ni->ibp_nconns);
 998         atomic_inc(&net->ibn_nconns);
 999         return conn;
1000
1001  failed_2:
1002         kiblnd_destroy_conn(conn);
1003         LIBCFS_FREE(conn, sizeof(*conn));
1004  failed_0:
1005         return NULL;
1006 }
1007
1008 void
1009 kiblnd_destroy_conn(struct kib_conn *conn)
1010 {
1011         struct rdma_cm_id *cmid = conn->ibc_cmid;
1012         struct kib_peer_ni *peer_ni = conn->ibc_peer;
1013
1014         LASSERT (!in_interrupt());
1015         LASSERT (atomic_read(&conn->ibc_refcount) == 0);
1016         LASSERT(list_empty(&conn->ibc_early_rxs));
1017         LASSERT(list_empty(&conn->ibc_tx_noops));
1018         LASSERT(list_empty(&conn->ibc_tx_queue));
1019         LASSERT(list_empty(&conn->ibc_tx_queue_rsrvd));
1020         LASSERT(list_empty(&conn->ibc_tx_queue_nocred));
1021         LASSERT(list_empty(&conn->ibc_active_txs));
1022         LASSERT (conn->ibc_noops_posted == 0);
1023         LASSERT (conn->ibc_nsends_posted == 0);
1024
1025         switch (conn->ibc_state) {
1026         default:
1027                 /* conn must be completely disengaged from the network */
1028                 LBUG();
1029
1030         case IBLND_CONN_DISCONNECTED:
1031                 /* connvars should have been freed already */
1032                 LASSERT (conn->ibc_connvars == NULL);
1033                 break;
1034
1035         case IBLND_CONN_INIT:
1036                 break;
1037         }
1038
1039         /* conn->ibc_cmid might be destroyed by CM already */
1040         if (cmid != NULL && cmid->qp != NULL)
1041                 rdma_destroy_qp(cmid);
1042
1043         if (conn->ibc_cq)
1044                 ib_destroy_cq(conn->ibc_cq);
1045
1046         kiblnd_txlist_done(&conn->ibc_zombie_txs, -ECONNABORTED,
1047                            LNET_MSG_STATUS_OK);
1048
1049         if (conn->ibc_rx_pages != NULL)
1050                 kiblnd_unmap_rx_descs(conn);
1051
1052         if (conn->ibc_rxs != NULL)
1053                 CFS_FREE_PTR_ARRAY(conn->ibc_rxs, IBLND_RX_MSGS(conn));
1054
1055         if (conn->ibc_connvars != NULL)
1056                 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
1057
1058         if (conn->ibc_hdev != NULL)
1059                 kiblnd_hdev_decref(conn->ibc_hdev);
1060
1061         /* See CAVEAT EMPTOR above in kiblnd_create_conn */
1062         if (conn->ibc_state != IBLND_CONN_INIT) {
1063                 struct kib_net *net = peer_ni->ibp_ni->ni_data;
1064
1065                 kiblnd_peer_decref(peer_ni);
1066                 rdma_destroy_id(cmid);
1067                 atomic_dec(&peer_ni->ibp_nconns);
1068                 atomic_dec(&net->ibn_nconns);
1069         }
1070 }
1071
1072 int
1073 kiblnd_close_peer_conns_locked(struct kib_peer_ni *peer_ni, int why)
1074 {
1075         struct kib_conn *conn;
1076         struct kib_conn *cnxt;
1077         int count = 0;
1078
1079         list_for_each_entry_safe(conn, cnxt, &peer_ni->ibp_conns,
1080                                  ibc_list) {
1081                 CDEBUG(D_NET, "Closing conn -> %s, "
1082                               "version: %x, reason: %d\n",
1083                        libcfs_nid2str(peer_ni->ibp_nid),
1084                        conn->ibc_version, why);
1085
1086                 kiblnd_close_conn_locked(conn, why);
1087                 count++;
1088         }
1089
1090         return count;
1091 }
1092
1093 int
1094 kiblnd_close_stale_conns_locked(struct kib_peer_ni *peer_ni,
1095                                 int version, __u64 incarnation)
1096 {
1097         struct kib_conn *conn;
1098         struct kib_conn *cnxt;
1099         int count = 0;
1100
1101         list_for_each_entry_safe(conn, cnxt, &peer_ni->ibp_conns,
1102                                  ibc_list) {
1103                 if (conn->ibc_version     == version &&
1104                     conn->ibc_incarnation == incarnation)
1105                         continue;
1106
1107                 CDEBUG(D_NET, "Closing stale conn -> %s version: %x, "
1108                               "incarnation:%#llx(%x, %#llx)\n",
1109                        libcfs_nid2str(peer_ni->ibp_nid),
1110                        conn->ibc_version, conn->ibc_incarnation,
1111                        version, incarnation);
1112
1113                 kiblnd_close_conn_locked(conn, -ESTALE);
1114                 count++;
1115         }
1116
1117         return count;
1118 }
1119
1120 static int
1121 kiblnd_close_matching_conns(struct lnet_ni *ni, lnet_nid_t nid)
1122 {
1123         struct kib_peer_ni *peer_ni;
1124         struct hlist_node *pnxt;
1125         int lo;
1126         int hi;
1127         int i;
1128         unsigned long flags;
1129         int count = 0;
1130
1131         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1132
1133         if (nid != LNET_NID_ANY) {
1134                 lo = hash_min(nid, HASH_BITS(kiblnd_data.kib_peers));
1135                 hi = lo;
1136         } else {
1137                 lo = 0;
1138                 hi = HASH_SIZE(kiblnd_data.kib_peers) - 1;
1139         }
1140
1141         for (i = lo; i <= hi; i++) {
1142                 hlist_for_each_entry_safe(peer_ni, pnxt,
1143                                           &kiblnd_data.kib_peers[i], ibp_list) {
1144                         LASSERT(!kiblnd_peer_idle(peer_ni));
1145
1146                         if (peer_ni->ibp_ni != ni)
1147                                 continue;
1148
1149                         if (!(nid == LNET_NID_ANY || nid == peer_ni->ibp_nid))
1150                                 continue;
1151
1152                         count += kiblnd_close_peer_conns_locked(peer_ni, 0);
1153                 }
1154         }
1155
1156         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1157
1158         /* wildcards always succeed */
1159         if (nid == LNET_NID_ANY)
1160                 return 0;
1161
1162         return (count == 0) ? -ENOENT : 0;
1163 }
1164
1165 static int
1166 kiblnd_ctl(struct lnet_ni *ni, unsigned int cmd, void *arg)
1167 {
1168         struct libcfs_ioctl_data *data = arg;
1169         int                       rc = -EINVAL;
1170
1171         switch(cmd) {
1172         case IOC_LIBCFS_GET_PEER: {
1173                 lnet_nid_t   nid = 0;
1174                 int          count = 0;
1175
1176                 rc = kiblnd_get_peer_info(ni, data->ioc_nid, data->ioc_count,
1177                                           &nid, &count);
1178                 data->ioc_nid    = nid;
1179                 data->ioc_count  = count;
1180                 break;
1181         }
1182
1183         case IOC_LIBCFS_DEL_PEER: {
1184                 rc = kiblnd_del_peer(ni, data->ioc_nid);
1185                 break;
1186         }
1187         case IOC_LIBCFS_GET_CONN: {
1188                 struct kib_conn *conn;
1189
1190                 rc = 0;
1191                 conn = kiblnd_get_conn_by_idx(ni, data->ioc_count);
1192                 if (conn == NULL) {
1193                         rc = -ENOENT;
1194                         break;
1195                 }
1196
1197                 LASSERT(conn->ibc_cmid != NULL);
1198                 data->ioc_nid = conn->ibc_peer->ibp_nid;
1199                 if (conn->ibc_cmid->route.path_rec == NULL)
1200                         data->ioc_u32[0] = 0; /* iWarp has no path MTU */
1201                 else
1202                         data->ioc_u32[0] =
1203                         ib_mtu_enum_to_int(conn->ibc_cmid->route.path_rec->mtu);
1204                 kiblnd_conn_decref(conn);
1205                 break;
1206         }
1207         case IOC_LIBCFS_CLOSE_CONNECTION: {
1208                 rc = kiblnd_close_matching_conns(ni, data->ioc_nid);
1209                 break;
1210         }
1211
1212         default:
1213                 break;
1214         }
1215
1216         return rc;
1217 }
1218
1219 static const struct ln_key_list kiblnd_tunables_keys = {
1220         .lkl_maxattr                    = LNET_NET_O2IBLND_TUNABLES_ATTR_MAX,
1221         .lkl_list                       = {
1222                 [LNET_NET_O2IBLND_TUNABLES_ATTR_HIW_PEER_CREDITS]  = {
1223                         .lkp_value      = "peercredits_hiw",
1224                         .lkp_data_type  = NLA_U32
1225                 },
1226                 [LNET_NET_O2IBLND_TUNABLES_ATTR_MAP_ON_DEMAND]  = {
1227                         .lkp_value      = "map_on_demand",
1228                         .lkp_data_type  = NLA_FLAG
1229                 },
1230                 [LNET_NET_O2IBLND_TUNABLES_ATTR_CONCURRENT_SENDS]  = {
1231                         .lkp_value      = "concurrent_sends",
1232                         .lkp_data_type  = NLA_U32
1233                 },
1234                 [LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_POOL_SIZE]  = {
1235                         .lkp_value      = "fmr_pool_size",
1236                         .lkp_data_type  = NLA_U32
1237                 },
1238                 [LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_FLUSH_TRIGGER]  = {
1239                         .lkp_value      = "fmr_flush_trigger",
1240                         .lkp_data_type  = NLA_U32
1241                 },
1242                 [LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_CACHE]  = {
1243                         .lkp_value      = "fmr_cache",
1244                         .lkp_data_type  = NLA_U32
1245                 },
1246                 [LNET_NET_O2IBLND_TUNABLES_ATTR_NTX]  = {
1247                         .lkp_value      = "ntx",
1248                         .lkp_data_type  = NLA_U16
1249                 },
1250                 [LNET_NET_O2IBLND_TUNABLES_ATTR_CONNS_PER_PEER]  = {
1251                         .lkp_value      = "conns_per_peer",
1252                         .lkp_data_type  = NLA_U16
1253                 },
1254                 [LNET_NET_O2IBLND_TUNABLES_ATTR_LND_TIMEOUT] = {
1255                         .lkp_value      = "timeout",
1256                         .lkp_data_type  = NLA_U32,
1257                 },
1258         },
1259 };
1260
1261 static int
1262 kiblnd_nl_get(int cmd, struct sk_buff *msg, int type, void *data)
1263 {
1264         struct lnet_ioctl_config_o2iblnd_tunables *tuns;
1265         struct lnet_ni *ni = data;
1266
1267         if (!ni || !msg)
1268                 return -EINVAL;
1269
1270         if (cmd != LNET_CMD_NETS || type != LNET_NET_LOCAL_NI_ATTR_LND_TUNABLES)
1271                 return -EOPNOTSUPP;
1272
1273         tuns = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
1274         nla_put_u32(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_HIW_PEER_CREDITS,
1275                     tuns->lnd_peercredits_hiw);
1276         if (tuns->lnd_map_on_demand) {
1277                 nla_put_flag(msg,
1278                              LNET_NET_O2IBLND_TUNABLES_ATTR_MAP_ON_DEMAND);
1279         }
1280         nla_put_u32(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_CONCURRENT_SENDS,
1281                     tuns->lnd_concurrent_sends);
1282         nla_put_u32(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_POOL_SIZE,
1283                     tuns->lnd_fmr_pool_size);
1284         nla_put_u32(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_FLUSH_TRIGGER,
1285                     tuns->lnd_fmr_flush_trigger);
1286         nla_put_u32(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_CACHE,
1287                     tuns->lnd_fmr_cache);
1288         nla_put_u16(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_NTX, tuns->lnd_ntx);
1289         nla_put_u16(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_CONNS_PER_PEER,
1290                     tuns->lnd_conns_per_peer);
1291         nla_put_u32(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_LND_TIMEOUT,
1292                     kiblnd_timeout());
1293
1294         return 0;
1295 }
1296
1297 static int
1298 kiblnd_nl_set(int cmd, struct nlattr *attr, int type, void *data)
1299 {
1300         struct lnet_lnd_tunables *tunables = data;
1301         s64 num;
1302
1303         if (cmd != LNET_CMD_NETS)
1304                 return -EOPNOTSUPP;
1305
1306         if (nla_type(attr) != LN_SCALAR_ATTR_INT_VALUE)
1307                 return -EINVAL;
1308
1309         switch (type) {
1310         case LNET_NET_O2IBLND_TUNABLES_ATTR_HIW_PEER_CREDITS:
1311                 tunables->lnd_tun_u.lnd_o2ib.lnd_peercredits_hiw = nla_get_s64(attr);
1312                 break;
1313         case LNET_NET_O2IBLND_TUNABLES_ATTR_MAP_ON_DEMAND:
1314                 tunables->lnd_tun_u.lnd_o2ib.lnd_map_on_demand = nla_get_s64(attr);
1315                 break;
1316         case LNET_NET_O2IBLND_TUNABLES_ATTR_CONCURRENT_SENDS:
1317                 tunables->lnd_tun_u.lnd_o2ib.lnd_concurrent_sends = nla_get_s64(attr);
1318                 break;
1319         case LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_POOL_SIZE:
1320                 tunables->lnd_tun_u.lnd_o2ib.lnd_fmr_pool_size = nla_get_s64(attr);
1321                 break;
1322         case LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_FLUSH_TRIGGER:
1323                 tunables->lnd_tun_u.lnd_o2ib.lnd_fmr_flush_trigger = nla_get_s64(attr);
1324                 break;
1325         case LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_CACHE:
1326                 tunables->lnd_tun_u.lnd_o2ib.lnd_fmr_cache = nla_get_s64(attr);
1327                 break;
1328         case LNET_NET_O2IBLND_TUNABLES_ATTR_NTX:
1329                 tunables->lnd_tun_u.lnd_o2ib.lnd_ntx = nla_get_s64(attr);
1330                 break;
1331         case LNET_NET_O2IBLND_TUNABLES_ATTR_CONNS_PER_PEER:
1332                 num = nla_get_s64(attr);
1333                 clamp_t(s64, num, 1, 127);
1334                 tunables->lnd_tun_u.lnd_o2ib.lnd_conns_per_peer = num;
1335                 fallthrough;
1336         default:
1337                 break;
1338         }
1339
1340         return 0;
1341 }
1342
1343 static void
1344 kiblnd_free_pages(struct kib_pages *p)
1345 {
1346         int     npages = p->ibp_npages;
1347         int     i;
1348
1349         for (i = 0; i < npages; i++) {
1350                 if (p->ibp_pages[i] != NULL)
1351                         __free_page(p->ibp_pages[i]);
1352         }
1353
1354         LIBCFS_FREE(p, offsetof(struct kib_pages, ibp_pages[npages]));
1355 }
1356
1357 int
1358 kiblnd_alloc_pages(struct kib_pages **pp, int cpt, int npages)
1359 {
1360         struct kib_pages *p;
1361         int i;
1362
1363         LIBCFS_CPT_ALLOC(p, lnet_cpt_table(), cpt,
1364                          offsetof(struct kib_pages, ibp_pages[npages]));
1365         if (p == NULL) {
1366                 CERROR("Can't allocate descriptor for %d pages\n", npages);
1367                 return -ENOMEM;
1368         }
1369
1370         memset(p, 0, offsetof(struct kib_pages, ibp_pages[npages]));
1371         p->ibp_npages = npages;
1372
1373         for (i = 0; i < npages; i++) {
1374                 p->ibp_pages[i] = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1375                                                      GFP_NOFS);
1376                 if (p->ibp_pages[i] == NULL) {
1377                         CERROR("Can't allocate page %d of %d\n", i, npages);
1378                         kiblnd_free_pages(p);
1379                         return -ENOMEM;
1380                 }
1381         }
1382
1383         *pp = p;
1384         return 0;
1385 }
1386
1387 void
1388 kiblnd_unmap_rx_descs(struct kib_conn *conn)
1389 {
1390         struct kib_rx *rx;
1391         int       i;
1392
1393         LASSERT (conn->ibc_rxs != NULL);
1394         LASSERT (conn->ibc_hdev != NULL);
1395
1396         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
1397                 rx = &conn->ibc_rxs[i];
1398
1399                 LASSERT(rx->rx_nob >= 0); /* not posted */
1400
1401                 kiblnd_dma_unmap_single(conn->ibc_hdev->ibh_ibdev,
1402                                         KIBLND_UNMAP_ADDR(rx, rx_msgunmap,
1403                                                           rx->rx_msgaddr),
1404                                         IBLND_MSG_SIZE, DMA_FROM_DEVICE);
1405         }
1406
1407         kiblnd_free_pages(conn->ibc_rx_pages);
1408
1409         conn->ibc_rx_pages = NULL;
1410 }
1411
1412 void
1413 kiblnd_map_rx_descs(struct kib_conn *conn)
1414 {
1415         struct kib_rx *rx;
1416         struct page    *pg;
1417         int             pg_off;
1418         int             ipg;
1419         int             i;
1420
1421         for (pg_off = ipg = i = 0; i < IBLND_RX_MSGS(conn); i++) {
1422                 pg = conn->ibc_rx_pages->ibp_pages[ipg];
1423                 rx = &conn->ibc_rxs[i];
1424
1425                 rx->rx_conn = conn;
1426                 rx->rx_msg = (struct kib_msg *)(((char *)page_address(pg)) + pg_off);
1427
1428                 rx->rx_msgaddr =
1429                         kiblnd_dma_map_single(conn->ibc_hdev->ibh_ibdev,
1430                                               rx->rx_msg, IBLND_MSG_SIZE,
1431                                               DMA_FROM_DEVICE);
1432                 LASSERT(!kiblnd_dma_mapping_error(conn->ibc_hdev->ibh_ibdev,
1433                                                   rx->rx_msgaddr));
1434                 KIBLND_UNMAP_ADDR_SET(rx, rx_msgunmap, rx->rx_msgaddr);
1435
1436                 CDEBUG(D_NET, "rx %d: %p %#llx(%#llx)\n",
1437                        i, rx->rx_msg, rx->rx_msgaddr,
1438                        (__u64)(page_to_phys(pg) + pg_off));
1439
1440                 pg_off += IBLND_MSG_SIZE;
1441                 LASSERT(pg_off <= PAGE_SIZE);
1442
1443                 if (pg_off == PAGE_SIZE) {
1444                         pg_off = 0;
1445                         ipg++;
1446                         LASSERT(ipg <= IBLND_RX_MSG_PAGES(conn));
1447                 }
1448         }
1449 }
1450
1451 static void
1452 kiblnd_unmap_tx_pool(struct kib_tx_pool *tpo)
1453 {
1454         struct kib_hca_dev *hdev = tpo->tpo_hdev;
1455         struct kib_tx *tx;
1456         int i;
1457
1458         LASSERT (tpo->tpo_pool.po_allocated == 0);
1459
1460         if (hdev == NULL)
1461                 return;
1462
1463         for (i = 0; i < tpo->tpo_pool.po_size; i++) {
1464                 tx = &tpo->tpo_tx_descs[i];
1465                 kiblnd_dma_unmap_single(hdev->ibh_ibdev,
1466                                         KIBLND_UNMAP_ADDR(tx, tx_msgunmap,
1467                                                           tx->tx_msgaddr),
1468                                         IBLND_MSG_SIZE, DMA_TO_DEVICE);
1469         }
1470
1471         kiblnd_hdev_decref(hdev);
1472         tpo->tpo_hdev = NULL;
1473 }
1474
1475 static struct kib_hca_dev *
1476 kiblnd_current_hdev(struct kib_dev *dev)
1477 {
1478         struct kib_hca_dev *hdev;
1479         unsigned long  flags;
1480         int            i = 0;
1481
1482         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1483         while (dev->ibd_failover) {
1484                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1485                 if (i++ % 50 == 0)
1486                         CDEBUG(D_NET, "%s: Wait for failover\n",
1487                                dev->ibd_ifname);
1488                 schedule_timeout_interruptible(cfs_time_seconds(1) / 100);
1489
1490                 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1491         }
1492
1493         kiblnd_hdev_addref_locked(dev->ibd_hdev);
1494         hdev = dev->ibd_hdev;
1495
1496         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1497
1498         return hdev;
1499 }
1500
1501 static void
1502 kiblnd_map_tx_pool(struct kib_tx_pool *tpo)
1503 {
1504         struct kib_pages *txpgs = tpo->tpo_tx_pages;
1505         struct kib_pool *pool = &tpo->tpo_pool;
1506         struct kib_net      *net   = pool->po_owner->ps_net;
1507         struct kib_dev *dev;
1508         struct page *page;
1509         struct kib_tx *tx;
1510         int             page_offset;
1511         int             ipage;
1512         int             i;
1513
1514         LASSERT (net != NULL);
1515
1516         dev = net->ibn_dev;
1517
1518         /* pre-mapped messages are not bigger than 1 page */
1519         BUILD_BUG_ON(IBLND_MSG_SIZE > PAGE_SIZE);
1520
1521         /* No fancy arithmetic when we do the buffer calculations */
1522         BUILD_BUG_ON(PAGE_SIZE % IBLND_MSG_SIZE != 0);
1523
1524         tpo->tpo_hdev = kiblnd_current_hdev(dev);
1525
1526         for (ipage = page_offset = i = 0; i < pool->po_size; i++) {
1527                 page = txpgs->ibp_pages[ipage];
1528                 tx = &tpo->tpo_tx_descs[i];
1529
1530                 tx->tx_msg = (struct kib_msg *)(((char *)page_address(page)) +
1531                                                 page_offset);
1532
1533                 tx->tx_msgaddr = kiblnd_dma_map_single(tpo->tpo_hdev->ibh_ibdev,
1534                                                        tx->tx_msg,
1535                                                        IBLND_MSG_SIZE,
1536                                                        DMA_TO_DEVICE);
1537                 LASSERT(!kiblnd_dma_mapping_error(tpo->tpo_hdev->ibh_ibdev,
1538                                                   tx->tx_msgaddr));
1539                 KIBLND_UNMAP_ADDR_SET(tx, tx_msgunmap, tx->tx_msgaddr);
1540
1541                 list_add(&tx->tx_list, &pool->po_free_list);
1542
1543                 page_offset += IBLND_MSG_SIZE;
1544                 LASSERT(page_offset <= PAGE_SIZE);
1545
1546                 if (page_offset == PAGE_SIZE) {
1547                         page_offset = 0;
1548                         ipage++;
1549                         LASSERT(ipage <= txpgs->ibp_npages);
1550                 }
1551         }
1552 }
1553
1554 static void
1555 kiblnd_destroy_fmr_pool(struct kib_fmr_pool *fpo)
1556 {
1557         LASSERT(fpo->fpo_map_count == 0);
1558
1559 #ifdef HAVE_FMR_POOL_API
1560         if (fpo->fpo_is_fmr && fpo->fmr.fpo_fmr_pool) {
1561                 ib_destroy_fmr_pool(fpo->fmr.fpo_fmr_pool);
1562         } else
1563 #endif /* HAVE_FMR_POOL_API */
1564         {
1565                 struct kib_fast_reg_descriptor *frd, *tmp;
1566                 int i = 0;
1567
1568                 list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1569                                          frd_list) {
1570                         list_del(&frd->frd_list);
1571 #ifndef HAVE_IB_MAP_MR_SG
1572                         ib_free_fast_reg_page_list(frd->frd_frpl);
1573 #endif
1574                         ib_dereg_mr(frd->frd_mr);
1575                         LIBCFS_FREE(frd, sizeof(*frd));
1576                         i++;
1577                 }
1578                 if (i < fpo->fast_reg.fpo_pool_size)
1579                         CERROR("FastReg pool still has %d regions registered\n",
1580                                 fpo->fast_reg.fpo_pool_size - i);
1581         }
1582
1583         if (fpo->fpo_hdev)
1584                 kiblnd_hdev_decref(fpo->fpo_hdev);
1585
1586         LIBCFS_FREE(fpo, sizeof(*fpo));
1587 }
1588
1589 static void
1590 kiblnd_destroy_fmr_pool_list(struct list_head *head)
1591 {
1592         struct kib_fmr_pool *fpo, *tmp;
1593
1594         list_for_each_entry_safe(fpo, tmp, head, fpo_list) {
1595                 list_del(&fpo->fpo_list);
1596                 kiblnd_destroy_fmr_pool(fpo);
1597         }
1598 }
1599
1600 static int
1601 kiblnd_fmr_pool_size(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1602                      int ncpts)
1603 {
1604         int size = tunables->lnd_fmr_pool_size / ncpts;
1605
1606         return max(IBLND_FMR_POOL, size);
1607 }
1608
1609 static int
1610 kiblnd_fmr_flush_trigger(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1611                          int ncpts)
1612 {
1613         int size = tunables->lnd_fmr_flush_trigger / ncpts;
1614
1615         return max(IBLND_FMR_POOL_FLUSH, size);
1616 }
1617
1618 #ifdef HAVE_FMR_POOL_API
1619 static int kiblnd_alloc_fmr_pool(struct kib_fmr_poolset *fps,
1620                                  struct kib_fmr_pool *fpo)
1621 {
1622         struct ib_fmr_pool_param param = {
1623                 .max_pages_per_fmr = IBLND_MAX_RDMA_FRAGS,
1624                 .page_shift        = PAGE_SHIFT,
1625                 .access            = (IB_ACCESS_LOCAL_WRITE |
1626                                       IB_ACCESS_REMOTE_WRITE),
1627                 .pool_size         = fps->fps_pool_size,
1628                 .dirty_watermark   = fps->fps_flush_trigger,
1629                 .flush_function    = NULL,
1630                 .flush_arg         = NULL,
1631                 .cache             = !!fps->fps_cache };
1632         int rc = 0;
1633
1634         fpo->fmr.fpo_fmr_pool = ib_create_fmr_pool(fpo->fpo_hdev->ibh_pd,
1635                                                    &param);
1636         if (IS_ERR(fpo->fmr.fpo_fmr_pool)) {
1637                 rc = PTR_ERR(fpo->fmr.fpo_fmr_pool);
1638                 if (rc != -ENOSYS)
1639                         CERROR("Failed to create FMR pool: %d\n", rc);
1640                 else
1641                         CERROR("FMRs are not supported\n");
1642         }
1643         fpo->fpo_is_fmr = true;
1644
1645         return rc;
1646 }
1647 #endif /* HAVE_FMR_POOL_API */
1648
1649 static int kiblnd_alloc_freg_pool(struct kib_fmr_poolset *fps,
1650                                   struct kib_fmr_pool *fpo,
1651                                   enum kib_dev_caps dev_caps)
1652 {
1653         struct kib_fast_reg_descriptor *frd, *tmp;
1654         int i, rc;
1655
1656 #ifdef HAVE_FMR_POOL_API
1657         fpo->fpo_is_fmr = false;
1658 #endif
1659
1660         INIT_LIST_HEAD(&fpo->fast_reg.fpo_pool_list);
1661         fpo->fast_reg.fpo_pool_size = 0;
1662         for (i = 0; i < fps->fps_pool_size; i++) {
1663                 LIBCFS_CPT_ALLOC(frd, lnet_cpt_table(), fps->fps_cpt,
1664                                  sizeof(*frd));
1665                 if (!frd) {
1666                         CERROR("Failed to allocate a new fast_reg descriptor\n");
1667                         rc = -ENOMEM;
1668                         goto out;
1669                 }
1670                 frd->frd_mr = NULL;
1671
1672 #ifndef HAVE_IB_MAP_MR_SG
1673                 frd->frd_frpl = ib_alloc_fast_reg_page_list(fpo->fpo_hdev->ibh_ibdev,
1674                                                             IBLND_MAX_RDMA_FRAGS);
1675                 if (IS_ERR(frd->frd_frpl)) {
1676                         rc = PTR_ERR(frd->frd_frpl);
1677                         CERROR("Failed to allocate ib_fast_reg_page_list: %d\n",
1678                                 rc);
1679                         frd->frd_frpl = NULL;
1680                         goto out_middle;
1681                 }
1682 #endif
1683
1684 #ifdef HAVE_IB_ALLOC_FAST_REG_MR
1685                 frd->frd_mr = ib_alloc_fast_reg_mr(fpo->fpo_hdev->ibh_pd,
1686                                                    IBLND_MAX_RDMA_FRAGS);
1687 #else
1688                 /*
1689                  * it is expected to get here if this is an MLX-5 card.
1690                  * MLX-4 cards will always use FMR and MLX-5 cards will
1691                  * always use fast_reg. It turns out that some MLX-5 cards
1692                  * (possibly due to older FW versions) do not natively support
1693                  * gaps. So we will need to track them here.
1694                  */
1695                 frd->frd_mr = ib_alloc_mr(fpo->fpo_hdev->ibh_pd,
1696 #ifdef IB_MR_TYPE_SG_GAPS
1697                                           ((*kiblnd_tunables.kib_use_fastreg_gaps == 1) &&
1698                                            (dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT)) ?
1699                                                 IB_MR_TYPE_SG_GAPS :
1700                                                 IB_MR_TYPE_MEM_REG,
1701 #else
1702                                                 IB_MR_TYPE_MEM_REG,
1703 #endif
1704                                           IBLND_MAX_RDMA_FRAGS);
1705                 if ((*kiblnd_tunables.kib_use_fastreg_gaps == 1) &&
1706                     (dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT))
1707                         CWARN("using IB_MR_TYPE_SG_GAPS, expect a performance drop\n");
1708 #endif
1709                 if (IS_ERR(frd->frd_mr)) {
1710                         rc = PTR_ERR(frd->frd_mr);
1711                         CERROR("Failed to allocate ib_fast_reg_mr: %d\n", rc);
1712                         frd->frd_mr = NULL;
1713                         goto out_middle;
1714                 }
1715
1716                 /* indicate that the local invalidate needs to be generated */
1717                 frd->frd_valid = false;
1718
1719                 list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1720                 fpo->fast_reg.fpo_pool_size++;
1721         }
1722
1723         return 0;
1724
1725 out_middle:
1726         if (frd->frd_mr)
1727                 ib_dereg_mr(frd->frd_mr);
1728 #ifndef HAVE_IB_MAP_MR_SG
1729         if (frd->frd_frpl)
1730                 ib_free_fast_reg_page_list(frd->frd_frpl);
1731 #endif
1732         LIBCFS_FREE(frd, sizeof(*frd));
1733
1734 out:
1735         list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1736                                  frd_list) {
1737                 list_del(&frd->frd_list);
1738 #ifndef HAVE_IB_MAP_MR_SG
1739                 ib_free_fast_reg_page_list(frd->frd_frpl);
1740 #endif
1741                 ib_dereg_mr(frd->frd_mr);
1742                 LIBCFS_FREE(frd, sizeof(*frd));
1743         }
1744
1745         return rc;
1746 }
1747
1748 static int kiblnd_create_fmr_pool(struct kib_fmr_poolset *fps,
1749                                   struct kib_fmr_pool **pp_fpo)
1750 {
1751         struct kib_dev *dev = fps->fps_net->ibn_dev;
1752         struct kib_fmr_pool *fpo;
1753         int rc;
1754
1755         LIBCFS_CPT_ALLOC(fpo, lnet_cpt_table(), fps->fps_cpt, sizeof(*fpo));
1756         if (!fpo) {
1757                 return -ENOMEM;
1758         }
1759         memset(fpo, 0, sizeof(*fpo));
1760
1761         fpo->fpo_hdev = kiblnd_current_hdev(dev);
1762
1763 #ifdef HAVE_FMR_POOL_API
1764         if (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)
1765                 rc = kiblnd_alloc_fmr_pool(fps, fpo);
1766         else
1767 #endif /* HAVE_FMR_POOL_API */
1768                 rc = kiblnd_alloc_freg_pool(fps, fpo, dev->ibd_dev_caps);
1769         if (rc)
1770                 goto out_fpo;
1771
1772         fpo->fpo_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
1773         fpo->fpo_owner = fps;
1774         *pp_fpo = fpo;
1775
1776         return 0;
1777
1778 out_fpo:
1779         kiblnd_hdev_decref(fpo->fpo_hdev);
1780         LIBCFS_FREE(fpo, sizeof(*fpo));
1781         return rc;
1782 }
1783
1784 static void
1785 kiblnd_fail_fmr_poolset(struct kib_fmr_poolset *fps, struct list_head *zombies)
1786 {
1787         struct kib_fmr_pool *fpo;
1788
1789         if (fps->fps_net == NULL) /* intialized? */
1790                 return;
1791
1792         spin_lock(&fps->fps_lock);
1793
1794         while ((fpo = list_first_entry_or_null(&fps->fps_pool_list,
1795                                                struct kib_fmr_pool,
1796                                                fpo_list)) != NULL) {
1797                 fpo->fpo_failed = 1;
1798                 if (fpo->fpo_map_count == 0)
1799                         list_move(&fpo->fpo_list, zombies);
1800                 else
1801                         list_move(&fpo->fpo_list, &fps->fps_failed_pool_list);
1802         }
1803
1804         spin_unlock(&fps->fps_lock);
1805 }
1806
1807 static void
1808 kiblnd_fini_fmr_poolset(struct kib_fmr_poolset *fps)
1809 {
1810         if (fps->fps_net != NULL) { /* initialized? */
1811                 kiblnd_destroy_fmr_pool_list(&fps->fps_failed_pool_list);
1812                 kiblnd_destroy_fmr_pool_list(&fps->fps_pool_list);
1813         }
1814 }
1815
1816 static int
1817 kiblnd_init_fmr_poolset(struct kib_fmr_poolset *fps, int cpt, int ncpts,
1818                         struct kib_net *net,
1819                         struct lnet_ioctl_config_o2iblnd_tunables *tunables)
1820 {
1821         struct kib_fmr_pool *fpo;
1822         int rc;
1823
1824         memset(fps, 0, sizeof(struct kib_fmr_poolset));
1825
1826         fps->fps_net = net;
1827         fps->fps_cpt = cpt;
1828
1829         fps->fps_pool_size = kiblnd_fmr_pool_size(tunables, ncpts);
1830         fps->fps_flush_trigger = kiblnd_fmr_flush_trigger(tunables, ncpts);
1831         fps->fps_cache = tunables->lnd_fmr_cache;
1832
1833         spin_lock_init(&fps->fps_lock);
1834         INIT_LIST_HEAD(&fps->fps_pool_list);
1835         INIT_LIST_HEAD(&fps->fps_failed_pool_list);
1836
1837         rc = kiblnd_create_fmr_pool(fps, &fpo);
1838         if (rc == 0)
1839                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1840
1841         return rc;
1842 }
1843
1844 static int
1845 kiblnd_fmr_pool_is_idle(struct kib_fmr_pool *fpo, time64_t now)
1846 {
1847         if (fpo->fpo_map_count != 0) /* still in use */
1848                 return 0;
1849         if (fpo->fpo_failed)
1850                 return 1;
1851         return now >= fpo->fpo_deadline;
1852 }
1853
1854 #if defined(HAVE_FMR_POOL_API) || !defined(HAVE_IB_MAP_MR_SG)
1855 static int
1856 kiblnd_map_tx_pages(struct kib_tx *tx, struct kib_rdma_desc *rd)
1857 {
1858         struct kib_hca_dev *hdev;
1859         __u64           *pages = tx->tx_pages;
1860         int             npages;
1861         int             size;
1862         int             i;
1863
1864         hdev = tx->tx_pool->tpo_hdev;
1865
1866         for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
1867                 for (size = 0; size <  rd->rd_frags[i].rf_nob;
1868                         size += hdev->ibh_page_size) {
1869                         pages[npages++] = (rd->rd_frags[i].rf_addr &
1870                                            hdev->ibh_page_mask) + size;
1871                 }
1872         }
1873
1874         return npages;
1875 }
1876 #endif
1877
1878 void
1879 kiblnd_fmr_pool_unmap(struct kib_fmr *fmr, int status)
1880 {
1881         LIST_HEAD(zombies);
1882         struct kib_fmr_pool *fpo = fmr->fmr_pool;
1883         struct kib_fmr_poolset *fps;
1884         time64_t now = ktime_get_seconds();
1885         struct kib_fmr_pool *tmp;
1886
1887         if (!fpo)
1888                 return;
1889
1890         fps = fpo->fpo_owner;
1891
1892 #ifdef HAVE_FMR_POOL_API
1893         if (fpo->fpo_is_fmr) {
1894                 if (fmr->fmr_pfmr) {
1895                         ib_fmr_pool_unmap(fmr->fmr_pfmr);
1896                         fmr->fmr_pfmr = NULL;
1897                 }
1898
1899                 if (status) {
1900                         int rc = ib_flush_fmr_pool(fpo->fmr.fpo_fmr_pool);
1901                         LASSERT(!rc);
1902                 }
1903         } else
1904 #endif /* HAVE_FMR_POOL_API */
1905         {
1906                 struct kib_fast_reg_descriptor *frd = fmr->fmr_frd;
1907                 if (frd) {
1908                         frd->frd_posted = false;
1909                         fmr->fmr_frd = NULL;
1910                         spin_lock(&fps->fps_lock);
1911                         list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1912                         spin_unlock(&fps->fps_lock);
1913                 }
1914         }
1915         fmr->fmr_pool = NULL;
1916
1917         spin_lock(&fps->fps_lock);
1918         fpo->fpo_map_count--;   /* decref the pool */
1919
1920         list_for_each_entry_safe(fpo, tmp, &fps->fps_pool_list, fpo_list) {
1921                 /* the first pool is persistent */
1922                 if (fps->fps_pool_list.next == &fpo->fpo_list)
1923                         continue;
1924
1925                 if (kiblnd_fmr_pool_is_idle(fpo, now)) {
1926                         list_move(&fpo->fpo_list, &zombies);
1927                         fps->fps_version++;
1928                 }
1929         }
1930         spin_unlock(&fps->fps_lock);
1931
1932         if (!list_empty(&zombies))
1933                 kiblnd_destroy_fmr_pool_list(&zombies);
1934 }
1935
1936 int kiblnd_fmr_pool_map(struct kib_fmr_poolset *fps, struct kib_tx *tx,
1937                         struct kib_rdma_desc *rd, u32 nob, u64 iov,
1938                         struct kib_fmr *fmr)
1939 {
1940         struct kib_fmr_pool *fpo;
1941         __u64 version;
1942         bool is_rx = (rd != tx->tx_rd);
1943 #ifdef HAVE_FMR_POOL_API
1944         __u64 *pages = tx->tx_pages;
1945         bool tx_pages_mapped = false;
1946         int npages = 0;
1947 #endif
1948         int rc;
1949
1950 again:
1951         spin_lock(&fps->fps_lock);
1952         version = fps->fps_version;
1953         list_for_each_entry(fpo, &fps->fps_pool_list, fpo_list) {
1954                 fpo->fpo_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
1955                 fpo->fpo_map_count++;
1956
1957 #ifdef HAVE_FMR_POOL_API
1958                 fmr->fmr_pfmr = NULL;
1959                 if (fpo->fpo_is_fmr) {
1960                         struct ib_pool_fmr *pfmr;
1961
1962                         spin_unlock(&fps->fps_lock);
1963
1964                         if (!tx_pages_mapped) {
1965                                 npages = kiblnd_map_tx_pages(tx, rd);
1966                                 tx_pages_mapped = true;
1967                         }
1968
1969                         pfmr = kib_fmr_pool_map(fpo->fmr.fpo_fmr_pool,
1970                                                 pages, npages, iov);
1971                         if (likely(!IS_ERR(pfmr))) {
1972                                 fmr->fmr_key  = is_rx ? pfmr->fmr->rkey
1973                                         : pfmr->fmr->lkey;
1974                                 fmr->fmr_frd  = NULL;
1975                                 fmr->fmr_pfmr = pfmr;
1976                                 fmr->fmr_pool = fpo;
1977                                 return 0;
1978                         }
1979                         rc = PTR_ERR(pfmr);
1980                 } else
1981 #endif /* HAVE_FMR_POOL_API */
1982                 {
1983                         if (!list_empty(&fpo->fast_reg.fpo_pool_list)) {
1984                                 struct kib_fast_reg_descriptor *frd;
1985 #ifdef HAVE_IB_MAP_MR_SG
1986                                 struct ib_reg_wr *wr;
1987                                 int n;
1988 #else
1989                                 struct ib_rdma_wr *wr;
1990                                 struct ib_fast_reg_page_list *frpl;
1991 #endif
1992                                 struct ib_mr *mr;
1993
1994                                 frd = list_first_entry(
1995                                         &fpo->fast_reg.fpo_pool_list,
1996                                         struct kib_fast_reg_descriptor,
1997                                         frd_list);
1998                                 list_del(&frd->frd_list);
1999                                 spin_unlock(&fps->fps_lock);
2000
2001 #ifndef HAVE_IB_MAP_MR_SG
2002                                 frpl = frd->frd_frpl;
2003 #endif
2004                                 mr   = frd->frd_mr;
2005
2006                                 if (!frd->frd_valid) {
2007                                         struct ib_rdma_wr *inv_wr;
2008                                         __u32 key = is_rx ? mr->rkey : mr->lkey;
2009
2010                                         frd->frd_valid = true;
2011                                         inv_wr = &frd->frd_inv_wr;
2012                                         memset(inv_wr, 0, sizeof(*inv_wr));
2013
2014                                         inv_wr->wr.opcode = IB_WR_LOCAL_INV;
2015                                         inv_wr->wr.wr_id  = IBLND_WID_MR;
2016                                         inv_wr->wr.ex.invalidate_rkey = key;
2017
2018                                         /* Bump the key */
2019                                         key = ib_inc_rkey(key);
2020                                         ib_update_fast_reg_key(mr, key);
2021                                 }
2022
2023 #ifdef HAVE_IB_MAP_MR_SG
2024 #ifdef HAVE_IB_MAP_MR_SG_5ARGS
2025                                 n = ib_map_mr_sg(mr, tx->tx_frags,
2026                                                  rd->rd_nfrags, NULL, PAGE_SIZE);
2027 #else
2028                                 n = ib_map_mr_sg(mr, tx->tx_frags,
2029                                                  rd->rd_nfrags, PAGE_SIZE);
2030 #endif /* HAVE_IB_MAP_MR_SG_5ARGS */
2031                                 if (unlikely(n != rd->rd_nfrags)) {
2032                                         CERROR("Failed to map mr %d/%d elements\n",
2033                                                n, rd->rd_nfrags);
2034                                         return n < 0 ? n : -EINVAL;
2035                                 }
2036
2037                                 wr = &frd->frd_fastreg_wr;
2038                                 memset(wr, 0, sizeof(*wr));
2039
2040                                 wr->wr.opcode = IB_WR_REG_MR;
2041                                 wr->wr.wr_id  = IBLND_WID_MR;
2042                                 wr->wr.num_sge = 0;
2043                                 wr->wr.send_flags = 0;
2044                                 wr->mr = mr;
2045                                 wr->key = is_rx ? mr->rkey : mr->lkey;
2046                                 wr->access = (IB_ACCESS_LOCAL_WRITE |
2047                                               IB_ACCESS_REMOTE_WRITE);
2048 #else /* HAVE_IB_MAP_MR_SG */
2049                                 if (!tx_pages_mapped) {
2050                                         npages = kiblnd_map_tx_pages(tx, rd);
2051                                         tx_pages_mapped = true;
2052                                 }
2053
2054                                 LASSERT(npages <= frpl->max_page_list_len);
2055                                 memcpy(frpl->page_list, pages,
2056                                        sizeof(*pages) * npages);
2057
2058                                 /* Prepare FastReg WR */
2059                                 wr = &frd->frd_fastreg_wr;
2060                                 memset(wr, 0, sizeof(*wr));
2061
2062                                 wr->wr.opcode = IB_WR_FAST_REG_MR;
2063                                 wr->wr.wr_id  = IBLND_WID_MR;
2064
2065                                 wr->wr.wr.fast_reg.iova_start = iov;
2066                                 wr->wr.wr.fast_reg.page_list  = frpl;
2067                                 wr->wr.wr.fast_reg.page_list_len = npages;
2068                                 wr->wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2069                                 wr->wr.wr.fast_reg.length = nob;
2070                                 wr->wr.wr.fast_reg.rkey =
2071                                         is_rx ? mr->rkey : mr->lkey;
2072                                 wr->wr.wr.fast_reg.access_flags =
2073                                         (IB_ACCESS_LOCAL_WRITE |
2074                                          IB_ACCESS_REMOTE_WRITE);
2075 #endif /* HAVE_IB_MAP_MR_SG */
2076
2077                                 fmr->fmr_key  = is_rx ? mr->rkey : mr->lkey;
2078                                 fmr->fmr_frd  = frd;
2079                                 fmr->fmr_pool = fpo;
2080                                 frd->frd_posted = false;
2081                                 return 0;
2082                         }
2083                         spin_unlock(&fps->fps_lock);
2084                         rc = -EAGAIN;
2085                 }
2086
2087                 spin_lock(&fps->fps_lock);
2088                 fpo->fpo_map_count--;
2089                 if (rc != -EAGAIN) {
2090                         spin_unlock(&fps->fps_lock);
2091                         return rc;
2092                 }
2093
2094                 /* EAGAIN and ... */
2095                 if (version != fps->fps_version) {
2096                         spin_unlock(&fps->fps_lock);
2097                         goto again;
2098                 }
2099         }
2100
2101         if (fps->fps_increasing) {
2102                 spin_unlock(&fps->fps_lock);
2103                 CDEBUG(D_NET, "Another thread is allocating new "
2104                        "FMR pool, waiting for her to complete\n");
2105                 wait_var_event(fps, !fps->fps_increasing);
2106                 goto again;
2107
2108         }
2109
2110         if (ktime_get_seconds() < fps->fps_next_retry) {
2111                 /* someone failed recently */
2112                 spin_unlock(&fps->fps_lock);
2113                 return -EAGAIN;
2114         }
2115
2116         fps->fps_increasing = 1;
2117         spin_unlock(&fps->fps_lock);
2118
2119         CDEBUG(D_NET, "Allocate new FMR pool\n");
2120         rc = kiblnd_create_fmr_pool(fps, &fpo);
2121         spin_lock(&fps->fps_lock);
2122         fps->fps_increasing = 0;
2123         wake_up_var(fps);
2124         if (rc == 0) {
2125                 fps->fps_version++;
2126                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
2127         } else {
2128                 fps->fps_next_retry = ktime_get_seconds() + IBLND_POOL_RETRY;
2129         }
2130         spin_unlock(&fps->fps_lock);
2131
2132         goto again;
2133 }
2134
2135 static void
2136 kiblnd_fini_pool(struct kib_pool *pool)
2137 {
2138         LASSERT(list_empty(&pool->po_free_list));
2139         LASSERT(pool->po_allocated == 0);
2140
2141         CDEBUG(D_NET, "Finalize %s pool\n", pool->po_owner->ps_name);
2142 }
2143
2144 static void
2145 kiblnd_init_pool(struct kib_poolset *ps, struct kib_pool *pool, int size)
2146 {
2147         CDEBUG(D_NET, "Initialize %s pool\n", ps->ps_name);
2148
2149         memset(pool, 0, sizeof(struct kib_pool));
2150         INIT_LIST_HEAD(&pool->po_free_list);
2151         pool->po_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
2152         pool->po_owner = ps;
2153         pool->po_size = size;
2154 }
2155
2156 static void
2157 kiblnd_destroy_pool_list(struct list_head *head)
2158 {
2159         struct kib_pool *pool;
2160
2161         while ((pool = list_first_entry_or_null(head,
2162                                                 struct kib_pool,
2163                                                 po_list)) != NULL) {
2164                 list_del(&pool->po_list);
2165
2166                 LASSERT(pool->po_owner != NULL);
2167                 pool->po_owner->ps_pool_destroy(pool);
2168         }
2169 }
2170
2171 static void
2172 kiblnd_fail_poolset(struct kib_poolset *ps, struct list_head *zombies)
2173 {
2174         struct kib_pool *po;
2175
2176         if (ps->ps_net == NULL) /* intialized? */
2177                 return;
2178
2179         spin_lock(&ps->ps_lock);
2180         while ((po = list_first_entry_or_null(&ps->ps_pool_list,
2181                                               struct kib_pool,
2182                                               po_list)) != NULL) {
2183                 po->po_failed = 1;
2184                 if (po->po_allocated == 0)
2185                         list_move(&po->po_list, zombies);
2186                 else
2187                         list_move(&po->po_list, &ps->ps_failed_pool_list);
2188         }
2189         spin_unlock(&ps->ps_lock);
2190 }
2191
2192 static void
2193 kiblnd_fini_poolset(struct kib_poolset *ps)
2194 {
2195         if (ps->ps_net != NULL) { /* initialized? */
2196                 kiblnd_destroy_pool_list(&ps->ps_failed_pool_list);
2197                 kiblnd_destroy_pool_list(&ps->ps_pool_list);
2198         }
2199 }
2200
2201 static int
2202 kiblnd_init_poolset(struct kib_poolset *ps, int cpt,
2203                     struct kib_net *net, char *name, int size,
2204                     kib_ps_pool_create_t po_create,
2205                     kib_ps_pool_destroy_t po_destroy,
2206                     kib_ps_node_init_t nd_init,
2207                     kib_ps_node_fini_t nd_fini)
2208 {
2209         struct kib_pool *pool;
2210         int rc;
2211
2212         memset(ps, 0, sizeof(struct kib_poolset));
2213
2214         ps->ps_cpt          = cpt;
2215         ps->ps_net          = net;
2216         ps->ps_pool_create  = po_create;
2217         ps->ps_pool_destroy = po_destroy;
2218         ps->ps_node_init    = nd_init;
2219         ps->ps_node_fini    = nd_fini;
2220         ps->ps_pool_size    = size;
2221         if (strlcpy(ps->ps_name, name, sizeof(ps->ps_name))
2222             >= sizeof(ps->ps_name))
2223                 return -E2BIG;
2224         spin_lock_init(&ps->ps_lock);
2225         INIT_LIST_HEAD(&ps->ps_pool_list);
2226         INIT_LIST_HEAD(&ps->ps_failed_pool_list);
2227
2228         rc = ps->ps_pool_create(ps, size, &pool);
2229         if (rc == 0)
2230                 list_add(&pool->po_list, &ps->ps_pool_list);
2231         else
2232                 CERROR("Failed to create the first pool for %s\n", ps->ps_name);
2233
2234         return rc;
2235 }
2236
2237 static int
2238 kiblnd_pool_is_idle(struct kib_pool *pool, time64_t now)
2239 {
2240         if (pool->po_allocated != 0) /* still in use */
2241                 return 0;
2242         if (pool->po_failed)
2243                 return 1;
2244         return now >= pool->po_deadline;
2245 }
2246
2247 void
2248 kiblnd_pool_free_node(struct kib_pool *pool, struct list_head *node)
2249 {
2250         LIST_HEAD(zombies);
2251         struct kib_poolset *ps = pool->po_owner;
2252         struct kib_pool *tmp;
2253         time64_t now = ktime_get_seconds();
2254
2255         spin_lock(&ps->ps_lock);
2256
2257         if (ps->ps_node_fini != NULL)
2258                 ps->ps_node_fini(pool, node);
2259
2260         LASSERT(pool->po_allocated > 0);
2261         list_add(node, &pool->po_free_list);
2262         pool->po_allocated--;
2263
2264         list_for_each_entry_safe(pool, tmp, &ps->ps_pool_list, po_list) {
2265                 /* the first pool is persistent */
2266                 if (ps->ps_pool_list.next == &pool->po_list)
2267                         continue;
2268
2269                 if (kiblnd_pool_is_idle(pool, now))
2270                         list_move(&pool->po_list, &zombies);
2271         }
2272         spin_unlock(&ps->ps_lock);
2273
2274         if (!list_empty(&zombies))
2275                 kiblnd_destroy_pool_list(&zombies);
2276 }
2277
2278 struct list_head *
2279 kiblnd_pool_alloc_node(struct kib_poolset *ps)
2280 {
2281         struct list_head        *node;
2282         struct kib_pool *pool;
2283         int                     rc;
2284         unsigned int            interval = 1;
2285         ktime_t time_before;
2286         unsigned int trips = 0;
2287
2288 again:
2289         spin_lock(&ps->ps_lock);
2290         list_for_each_entry(pool, &ps->ps_pool_list, po_list) {
2291                 if (list_empty(&pool->po_free_list))
2292                         continue;
2293
2294                 pool->po_allocated++;
2295                 pool->po_deadline = ktime_get_seconds() +
2296                                     IBLND_POOL_DEADLINE;
2297                 node = pool->po_free_list.next;
2298                 list_del(node);
2299
2300                 if (ps->ps_node_init != NULL) {
2301                         /* still hold the lock */
2302                         ps->ps_node_init(pool, node);
2303                 }
2304                 spin_unlock(&ps->ps_lock);
2305                 return node;
2306         }
2307
2308         /* no available tx pool and ... */
2309         if (ps->ps_increasing) {
2310                 /* another thread is allocating a new pool */
2311                 spin_unlock(&ps->ps_lock);
2312                 trips++;
2313                 CDEBUG(D_NET,
2314                        "Another thread is allocating new %s pool, waiting %d jiffies for her to complete. trips = %d\n",
2315                        ps->ps_name, interval, trips);
2316
2317                 schedule_timeout_interruptible(interval);
2318                 if (interval < cfs_time_seconds(1))
2319                         interval *= 2;
2320
2321                 goto again;
2322         }
2323
2324         if (ktime_get_seconds() < ps->ps_next_retry) {
2325                 /* someone failed recently */
2326                 spin_unlock(&ps->ps_lock);
2327                 return NULL;
2328         }
2329
2330         ps->ps_increasing = 1;
2331         spin_unlock(&ps->ps_lock);
2332
2333         CDEBUG(D_NET, "%s pool exhausted, allocate new pool\n", ps->ps_name);
2334         time_before = ktime_get();
2335         rc = ps->ps_pool_create(ps, ps->ps_pool_size, &pool);
2336         CDEBUG(D_NET, "ps_pool_create took %lld ms to complete\n",
2337                ktime_ms_delta(ktime_get(), time_before));
2338
2339         spin_lock(&ps->ps_lock);
2340         ps->ps_increasing = 0;
2341         if (rc == 0) {
2342                 list_add_tail(&pool->po_list, &ps->ps_pool_list);
2343         } else {
2344                 ps->ps_next_retry = ktime_get_seconds() + IBLND_POOL_RETRY;
2345                 CERROR("Can't allocate new %s pool because out of memory\n",
2346                        ps->ps_name);
2347         }
2348         spin_unlock(&ps->ps_lock);
2349
2350         goto again;
2351 }
2352
2353 static void
2354 kiblnd_destroy_tx_pool(struct kib_pool *pool)
2355 {
2356         struct kib_tx_pool *tpo = container_of(pool, struct kib_tx_pool,
2357                                                tpo_pool);
2358         int i;
2359
2360         LASSERT (pool->po_allocated == 0);
2361
2362         if (tpo->tpo_tx_pages != NULL) {
2363                 kiblnd_unmap_tx_pool(tpo);
2364                 kiblnd_free_pages(tpo->tpo_tx_pages);
2365         }
2366
2367         if (tpo->tpo_tx_descs == NULL)
2368                 goto out;
2369
2370         for (i = 0; i < pool->po_size; i++) {
2371                 struct kib_tx *tx = &tpo->tpo_tx_descs[i];
2372                 int       wrq_sge = *kiblnd_tunables.kib_wrq_sge;
2373
2374                 list_del(&tx->tx_list);
2375                 if (tx->tx_pages != NULL)
2376                         CFS_FREE_PTR_ARRAY(tx->tx_pages, LNET_MAX_IOV);
2377                 if (tx->tx_frags != NULL)
2378                         CFS_FREE_PTR_ARRAY(tx->tx_frags,
2379                                            IBLND_MAX_RDMA_FRAGS);
2380                 if (tx->tx_wrq != NULL)
2381                         CFS_FREE_PTR_ARRAY(tx->tx_wrq,
2382                                            IBLND_MAX_RDMA_FRAGS);
2383                 if (tx->tx_sge != NULL) {
2384                         /* +1 is for the lnet header/message itself */
2385                         CFS_FREE_PTR_ARRAY(tx->tx_sge,
2386                                            (IBLND_MAX_RDMA_FRAGS *
2387                                            wrq_sge + 1));
2388                 }
2389                 if (tx->tx_rd != NULL)
2390                         LIBCFS_FREE(tx->tx_rd,
2391                                     offsetof(struct kib_rdma_desc,
2392                                              rd_frags[IBLND_MAX_RDMA_FRAGS]));
2393         }
2394
2395         CFS_FREE_PTR_ARRAY(tpo->tpo_tx_descs, pool->po_size);
2396 out:
2397         kiblnd_fini_pool(pool);
2398         CFS_FREE_PTR(tpo);
2399 }
2400
2401 static int kiblnd_tx_pool_size(struct lnet_ni *ni, int ncpts)
2402 {
2403         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2404         int ntx;
2405
2406         tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2407         ntx = tunables->lnd_ntx / ncpts;
2408
2409         return max(IBLND_TX_POOL, ntx);
2410 }
2411
2412 static int
2413 kiblnd_create_tx_pool(struct kib_poolset *ps, int size, struct kib_pool **pp_po)
2414 {
2415         int            i;
2416         int            npg;
2417         struct kib_pool *pool;
2418         struct kib_tx_pool *tpo;
2419
2420         LIBCFS_CPT_ALLOC(tpo, lnet_cpt_table(), ps->ps_cpt, sizeof(*tpo));
2421         if (tpo == NULL) {
2422                 CERROR("Failed to allocate TX pool\n");
2423                 return -ENOMEM;
2424         }
2425
2426         pool = &tpo->tpo_pool;
2427         kiblnd_init_pool(ps, pool, size);
2428         tpo->tpo_tx_descs = NULL;
2429         tpo->tpo_tx_pages = NULL;
2430
2431         npg = (size * IBLND_MSG_SIZE + PAGE_SIZE - 1) / PAGE_SIZE;
2432         if (kiblnd_alloc_pages(&tpo->tpo_tx_pages, ps->ps_cpt, npg) != 0) {
2433                 CERROR("Can't allocate tx pages: %d\n", npg);
2434                 CFS_FREE_PTR(tpo);
2435                 return -ENOMEM;
2436         }
2437
2438         LIBCFS_CPT_ALLOC(tpo->tpo_tx_descs, lnet_cpt_table(), ps->ps_cpt,
2439                          size * sizeof(struct kib_tx));
2440         if (tpo->tpo_tx_descs == NULL) {
2441                 CERROR("Can't allocate %d tx descriptors\n", size);
2442                 ps->ps_pool_destroy(pool);
2443                 return -ENOMEM;
2444         }
2445
2446         memset(tpo->tpo_tx_descs, 0, size * sizeof(struct kib_tx));
2447
2448         for (i = 0; i < size; i++) {
2449                 struct kib_tx *tx = &tpo->tpo_tx_descs[i];
2450                 int       wrq_sge = *kiblnd_tunables.kib_wrq_sge;
2451
2452                 tx->tx_pool = tpo;
2453                 if (ps->ps_net->ibn_fmr_ps != NULL) {
2454                         LIBCFS_CPT_ALLOC(tx->tx_pages,
2455                                          lnet_cpt_table(), ps->ps_cpt,
2456                                          LNET_MAX_IOV * sizeof(*tx->tx_pages));
2457                         if (tx->tx_pages == NULL)
2458                                 break;
2459                 }
2460
2461                 LIBCFS_CPT_ALLOC(tx->tx_frags, lnet_cpt_table(), ps->ps_cpt,
2462                                  IBLND_MAX_RDMA_FRAGS *
2463                                  sizeof(*tx->tx_frags));
2464                 if (tx->tx_frags == NULL)
2465                         break;
2466
2467                 sg_init_table(tx->tx_frags, IBLND_MAX_RDMA_FRAGS);
2468
2469                 LIBCFS_CPT_ALLOC(tx->tx_wrq, lnet_cpt_table(), ps->ps_cpt,
2470                                  IBLND_MAX_RDMA_FRAGS *
2471                                  sizeof(*tx->tx_wrq));
2472                 if (tx->tx_wrq == NULL)
2473                         break;
2474
2475                 /* +1 is for the lnet header/message itself */
2476                 LIBCFS_CPT_ALLOC(tx->tx_sge, lnet_cpt_table(), ps->ps_cpt,
2477                                  (IBLND_MAX_RDMA_FRAGS * wrq_sge + 1) *
2478                                  sizeof(*tx->tx_sge));
2479                 if (tx->tx_sge == NULL)
2480                         break;
2481
2482                 LIBCFS_CPT_ALLOC(tx->tx_rd, lnet_cpt_table(), ps->ps_cpt,
2483                                  offsetof(struct kib_rdma_desc,
2484                                           rd_frags[IBLND_MAX_RDMA_FRAGS]));
2485                 if (tx->tx_rd == NULL)
2486                         break;
2487         }
2488
2489         if (i == size) {
2490                 kiblnd_map_tx_pool(tpo);
2491                 *pp_po = pool;
2492                 return 0;
2493         }
2494
2495         ps->ps_pool_destroy(pool);
2496         return -ENOMEM;
2497 }
2498
2499 static void
2500 kiblnd_tx_init(struct kib_pool *pool, struct list_head *node)
2501 {
2502         struct kib_tx_poolset *tps = container_of(pool->po_owner,
2503                                                   struct kib_tx_poolset,
2504                                                   tps_poolset);
2505         struct kib_tx *tx  = list_entry(node, struct kib_tx, tx_list);
2506
2507         tx->tx_cookie = tps->tps_next_tx_cookie++;
2508 }
2509
2510 static void
2511 kiblnd_net_fini_pools(struct kib_net *net)
2512 {
2513         int     i;
2514
2515         cfs_cpt_for_each(i, lnet_cpt_table()) {
2516                 struct kib_tx_poolset *tps;
2517                 struct kib_fmr_poolset *fps;
2518
2519                 if (net->ibn_tx_ps != NULL) {
2520                         tps = net->ibn_tx_ps[i];
2521                         kiblnd_fini_poolset(&tps->tps_poolset);
2522                 }
2523
2524                 if (net->ibn_fmr_ps != NULL) {
2525                         fps = net->ibn_fmr_ps[i];
2526                         kiblnd_fini_fmr_poolset(fps);
2527                 }
2528         }
2529
2530         if (net->ibn_tx_ps != NULL) {
2531                 cfs_percpt_free(net->ibn_tx_ps);
2532                 net->ibn_tx_ps = NULL;
2533         }
2534
2535         if (net->ibn_fmr_ps != NULL) {
2536                 cfs_percpt_free(net->ibn_fmr_ps);
2537                 net->ibn_fmr_ps = NULL;
2538         }
2539 }
2540
2541 static int
2542 kiblnd_net_init_pools(struct kib_net *net, struct lnet_ni *ni, __u32 *cpts,
2543                       int ncpts)
2544 {
2545         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2546 #ifdef HAVE_IB_GET_DMA_MR
2547         unsigned long   flags;
2548 #endif
2549         int             cpt;
2550         int             rc;
2551         int             i;
2552
2553         tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2554
2555 #ifdef HAVE_IB_GET_DMA_MR
2556         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2557         /*
2558          * if lnd_map_on_demand is zero then we have effectively disabled
2559          * FMR or FastReg and we're using global memory regions
2560          * exclusively.
2561          */
2562         if (!tunables->lnd_map_on_demand) {
2563                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2564                                            flags);
2565                 goto create_tx_pool;
2566         }
2567
2568         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2569 #endif
2570
2571         if (tunables->lnd_fmr_pool_size < tunables->lnd_ntx / 4) {
2572                 CERROR("Can't set fmr pool size (%d) < ntx / 4(%d)\n",
2573                        tunables->lnd_fmr_pool_size,
2574                        tunables->lnd_ntx / 4);
2575                 rc = -EINVAL;
2576                 goto failed;
2577         }
2578
2579         /* TX pool must be created later than FMR, see LU-2268
2580          * for details */
2581         LASSERT(net->ibn_tx_ps == NULL);
2582
2583         /* premapping can fail if ibd_nmr > 1, so we always create
2584          * FMR pool and map-on-demand if premapping failed */
2585
2586         net->ibn_fmr_ps = cfs_percpt_alloc(lnet_cpt_table(),
2587                                            sizeof(struct kib_fmr_poolset));
2588         if (net->ibn_fmr_ps == NULL) {
2589                 CERROR("Failed to allocate FMR pool array\n");
2590                 rc = -ENOMEM;
2591                 goto failed;
2592         }
2593
2594         for (i = 0; i < ncpts; i++) {
2595                 cpt = (cpts == NULL) ? i : cpts[i];
2596                 rc = kiblnd_init_fmr_poolset(net->ibn_fmr_ps[cpt], cpt, ncpts,
2597                                              net, tunables);
2598                 if (rc != 0) {
2599                         CERROR("Can't initialize FMR pool for CPT %d: %d\n",
2600                                cpt, rc);
2601                         goto failed;
2602                 }
2603         }
2604
2605         if (i > 0)
2606                 LASSERT(i == ncpts);
2607
2608 #ifdef HAVE_IB_GET_DMA_MR
2609  create_tx_pool:
2610 #endif
2611         net->ibn_tx_ps = cfs_percpt_alloc(lnet_cpt_table(),
2612                                           sizeof(struct kib_tx_poolset));
2613         if (net->ibn_tx_ps == NULL) {
2614                 CERROR("Failed to allocate tx pool array\n");
2615                 rc = -ENOMEM;
2616                 goto failed;
2617         }
2618
2619         for (i = 0; i < ncpts; i++) {
2620                 cpt = (cpts == NULL) ? i : cpts[i];
2621                 rc = kiblnd_init_poolset(&net->ibn_tx_ps[cpt]->tps_poolset,
2622                                          cpt, net, "TX",
2623                                          kiblnd_tx_pool_size(ni, ncpts),
2624                                          kiblnd_create_tx_pool,
2625                                          kiblnd_destroy_tx_pool,
2626                                          kiblnd_tx_init, NULL);
2627                 if (rc != 0) {
2628                         CERROR("Can't initialize TX pool for CPT %d: %d\n",
2629                                cpt, rc);
2630                         goto failed;
2631                 }
2632         }
2633
2634         return 0;
2635  failed:
2636         kiblnd_net_fini_pools(net);
2637         LASSERT(rc != 0);
2638         return rc;
2639 }
2640
2641 static int
2642 kiblnd_port_get_attr(struct kib_hca_dev *hdev)
2643 {
2644         struct ib_port_attr *port_attr;
2645         int rc;
2646         unsigned long flags;
2647         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2648
2649         LIBCFS_ALLOC(port_attr, sizeof(*port_attr));
2650         if (port_attr == NULL) {
2651                 CDEBUG(D_NETERROR, "Out of memory\n");
2652                 return -ENOMEM;
2653         }
2654
2655         rc = ib_query_port(hdev->ibh_ibdev, hdev->ibh_port, port_attr);
2656
2657         write_lock_irqsave(g_lock, flags);
2658
2659         if (rc == 0)
2660                 hdev->ibh_state = port_attr->state == IB_PORT_ACTIVE
2661                                  ? IBLND_DEV_PORT_ACTIVE
2662                                  : IBLND_DEV_PORT_DOWN;
2663
2664         write_unlock_irqrestore(g_lock, flags);
2665         LIBCFS_FREE(port_attr, sizeof(*port_attr));
2666
2667         if (rc != 0) {
2668                 CDEBUG(D_NETERROR, "Failed to query IB port: %d\n", rc);
2669                 return rc;
2670         }
2671         return 0;
2672 }
2673
2674 static inline void
2675 kiblnd_set_ni_fatal_on(struct kib_hca_dev *hdev, int val)
2676 {
2677         struct kib_net  *net;
2678         __u32 ni_state_before;
2679         bool update_ping_buf = false;
2680         struct lnet_ni *ni = NULL;
2681
2682         /* for health check */
2683         list_for_each_entry(net, &hdev->ibh_dev->ibd_nets, ibn_list) {
2684                 ni = net->ibn_ni;
2685                 if (val)
2686                         CDEBUG(D_NETERROR, "Fatal device error for NI %s\n",
2687                                         libcfs_nidstr(&ni->ni_nid));
2688                 ni_state_before = lnet_set_link_fatal_state(ni, val);
2689
2690                 if (!update_ping_buf &&
2691                     (ni->ni_state == LNET_NI_STATE_ACTIVE) &&
2692                     (val != ni_state_before) &&
2693                     (net->ibn_init == IBLND_INIT_ALL))
2694                         update_ping_buf = true;
2695         }
2696
2697         if (update_ping_buf)
2698                 lnet_mark_ping_buffer_for_update();
2699 }
2700
2701 static void
2702 kiblnd_event_handler(struct ib_event_handler *handler, struct ib_event *event)
2703 {
2704         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2705         struct kib_hca_dev  *hdev;
2706         unsigned long flags;
2707
2708         hdev = container_of(handler, struct kib_hca_dev, ibh_event_handler);
2709
2710         write_lock_irqsave(g_lock, flags);
2711
2712         switch (event->event) {
2713         case IB_EVENT_DEVICE_FATAL:
2714                 CDEBUG(D_NET, "IB device fatal\n");
2715                 hdev->ibh_state = IBLND_DEV_FATAL;
2716                 kiblnd_set_ni_fatal_on(hdev, 1);
2717                 break;
2718         case IB_EVENT_PORT_ACTIVE:
2719                 CDEBUG(D_NET, "IB port active\n");
2720                 if (event->element.port_num == hdev->ibh_port) {
2721                         hdev->ibh_state = IBLND_DEV_PORT_ACTIVE;
2722                         kiblnd_set_ni_fatal_on(hdev, 0);
2723                 }
2724                 break;
2725         case IB_EVENT_PORT_ERR:
2726                 CDEBUG(D_NET, "IB port err\n");
2727                 if (event->element.port_num == hdev->ibh_port) {
2728                         hdev->ibh_state = IBLND_DEV_PORT_DOWN;
2729                         kiblnd_set_ni_fatal_on(hdev, 1);
2730                 }
2731                 break;
2732         default:
2733                 break;
2734         }
2735         write_unlock_irqrestore(g_lock, flags);
2736 }
2737
2738 static int
2739 kiblnd_hdev_get_attr(struct kib_hca_dev *hdev)
2740 {
2741         struct ib_device_attr *dev_attr;
2742         int rc = 0;
2743         int rc2 = 0;
2744
2745         /* It's safe to assume a HCA can handle a page size
2746          * matching that of the native system */
2747         hdev->ibh_page_shift = PAGE_SHIFT;
2748         hdev->ibh_page_size  = 1 << PAGE_SHIFT;
2749         hdev->ibh_page_mask  = ~((__u64)hdev->ibh_page_size - 1);
2750
2751 #ifndef HAVE_IB_DEVICE_ATTRS
2752         LIBCFS_ALLOC(dev_attr, sizeof(*dev_attr));
2753         if (dev_attr == NULL) {
2754                 CERROR("Out of memory\n");
2755                 return -ENOMEM;
2756         }
2757
2758         rc = ib_query_device(hdev->ibh_ibdev, dev_attr);
2759         if (rc != 0) {
2760                 CERROR("Failed to query IB device: %d\n", rc);
2761                 goto out_clean_attr;
2762         }
2763 #else
2764         dev_attr = &hdev->ibh_ibdev->attrs;
2765 #endif
2766
2767         hdev->ibh_mr_size = dev_attr->max_mr_size;
2768         hdev->ibh_max_qp_wr = dev_attr->max_qp_wr;
2769
2770         /* Setup device Memory Registration capabilities */
2771 #ifdef HAVE_FMR_POOL_API
2772 #ifdef HAVE_IB_DEVICE_OPS
2773         if (hdev->ibh_ibdev->ops.alloc_fmr &&
2774             hdev->ibh_ibdev->ops.dealloc_fmr &&
2775             hdev->ibh_ibdev->ops.map_phys_fmr &&
2776             hdev->ibh_ibdev->ops.unmap_fmr) {
2777 #else
2778         if (hdev->ibh_ibdev->alloc_fmr &&
2779             hdev->ibh_ibdev->dealloc_fmr &&
2780             hdev->ibh_ibdev->map_phys_fmr &&
2781             hdev->ibh_ibdev->unmap_fmr) {
2782 #endif
2783                 LCONSOLE_INFO("Using FMR for registration\n");
2784                 hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FMR_ENABLED;
2785         } else
2786 #endif /* HAVE_FMR_POOL_API */
2787         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
2788                 LCONSOLE_INFO("Using FastReg for registration\n");
2789                 hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FASTREG_ENABLED;
2790 #ifndef HAVE_IB_ALLOC_FAST_REG_MR
2791 #ifdef IB_DEVICE_SG_GAPS_REG
2792                 if (dev_attr->device_cap_flags & IB_DEVICE_SG_GAPS_REG)
2793                         hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT;
2794 #endif
2795 #endif
2796         } else {
2797                 rc = -ENOSYS;
2798         }
2799
2800         rc2 = kiblnd_port_get_attr(hdev);
2801         if (rc2 != 0)
2802                 return rc2;
2803
2804         if (rc != 0)
2805                 rc = -EINVAL;
2806
2807 #ifndef HAVE_IB_DEVICE_ATTRS
2808 out_clean_attr:
2809         LIBCFS_FREE(dev_attr, sizeof(*dev_attr));
2810 #endif
2811
2812         if (rc == -ENOSYS)
2813                 CERROR("IB device does not support FMRs nor FastRegs, can't "
2814                        "register memory: %d\n", rc);
2815         else if (rc == -EINVAL)
2816                 CERROR("Invalid mr size: %#llx\n", hdev->ibh_mr_size);
2817         return rc;
2818 }
2819
2820 #ifdef HAVE_IB_GET_DMA_MR
2821 static void
2822 kiblnd_hdev_cleanup_mrs(struct kib_hca_dev *hdev)
2823 {
2824         if (hdev->ibh_mrs == NULL)
2825                 return;
2826
2827         ib_dereg_mr(hdev->ibh_mrs);
2828
2829         hdev->ibh_mrs = NULL;
2830 }
2831 #endif
2832
2833 void
2834 kiblnd_hdev_destroy(struct kib_hca_dev *hdev)
2835 {
2836         if (hdev->ibh_event_handler.device != NULL)
2837                 ib_unregister_event_handler(&hdev->ibh_event_handler);
2838
2839 #ifdef HAVE_IB_GET_DMA_MR
2840         kiblnd_hdev_cleanup_mrs(hdev);
2841 #endif
2842
2843         if (hdev->ibh_pd != NULL)
2844                 ib_dealloc_pd(hdev->ibh_pd);
2845
2846         if (hdev->ibh_cmid != NULL)
2847                 rdma_destroy_id(hdev->ibh_cmid);
2848
2849         LIBCFS_FREE(hdev, sizeof(*hdev));
2850 }
2851
2852 #ifdef HAVE_IB_GET_DMA_MR
2853 static int
2854 kiblnd_hdev_setup_mrs(struct kib_hca_dev *hdev)
2855 {
2856         struct ib_mr *mr;
2857         int           acflags = IB_ACCESS_LOCAL_WRITE |
2858                                 IB_ACCESS_REMOTE_WRITE;
2859
2860         mr = ib_get_dma_mr(hdev->ibh_pd, acflags);
2861         if (IS_ERR(mr)) {
2862                 CERROR("Failed ib_get_dma_mr: %ld\n", PTR_ERR(mr));
2863                 kiblnd_hdev_cleanup_mrs(hdev);
2864                 return PTR_ERR(mr);
2865         }
2866
2867         hdev->ibh_mrs = mr;
2868
2869         return 0;
2870 }
2871 #endif
2872
2873 static int
2874 kiblnd_dummy_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2875 {       /* DUMMY */
2876         return 0;
2877 }
2878
2879 static int
2880 kiblnd_dev_need_failover(struct kib_dev *dev, struct net *ns)
2881 {
2882         struct rdma_cm_id  *cmid;
2883         struct sockaddr_in  srcaddr;
2884         struct sockaddr_in  dstaddr;
2885         int                 rc;
2886
2887         if (dev->ibd_hdev == NULL || /* initializing */
2888             dev->ibd_hdev->ibh_cmid == NULL || /* listener is dead */
2889             *kiblnd_tunables.kib_dev_failover > 1) /* debugging */
2890                 return 1;
2891
2892         /* XXX: it's UGLY, but I don't have better way to find
2893          * ib-bonding HCA failover because:
2894          *
2895          * a. no reliable CM event for HCA failover...
2896          * b. no OFED API to get ib_device for current net_device...
2897          *
2898          * We have only two choices at this point:
2899          *
2900          * a. rdma_bind_addr(), it will conflict with listener cmid
2901          * b. rdma_resolve_addr() to zero addr */
2902         cmid = kiblnd_rdma_create_id(ns, kiblnd_dummy_callback, dev,
2903                                      RDMA_PS_TCP, IB_QPT_RC);
2904         if (IS_ERR(cmid)) {
2905                 rc = PTR_ERR(cmid);
2906                 CERROR("Failed to create cmid for failover: %d\n", rc);
2907                 return rc;
2908         }
2909
2910         memset(&srcaddr, 0, sizeof(srcaddr));
2911         srcaddr.sin_family      = AF_INET;
2912         srcaddr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2913
2914         memset(&dstaddr, 0, sizeof(dstaddr));
2915         dstaddr.sin_family = AF_INET;
2916         rc = rdma_resolve_addr(cmid, (struct sockaddr *)&srcaddr,
2917                                (struct sockaddr *)&dstaddr, 1);
2918         if (rc != 0 || cmid->device == NULL) {
2919                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2920                        dev->ibd_ifname, &dev->ibd_ifip,
2921                        cmid->device, rc);
2922                 rdma_destroy_id(cmid);
2923                 return rc;
2924         }
2925
2926         rc = dev->ibd_hdev->ibh_ibdev != cmid->device; /* true for failover */
2927         rdma_destroy_id(cmid);
2928         return rc;
2929 }
2930
2931 int
2932 kiblnd_dev_failover(struct kib_dev *dev, struct net *ns)
2933 {
2934         LIST_HEAD(zombie_tpo);
2935         LIST_HEAD(zombie_ppo);
2936         LIST_HEAD(zombie_fpo);
2937         struct rdma_cm_id  *cmid  = NULL;
2938         struct kib_hca_dev *hdev  = NULL;
2939         struct kib_hca_dev *old;
2940         struct ib_pd       *pd;
2941         struct kib_net *net;
2942         struct sockaddr_in  addr;
2943         struct net_device *netdev;
2944         unsigned long       flags;
2945         int                 rc = 0;
2946         int                 i;
2947         bool                set_fatal = true;
2948
2949         LASSERT(*kiblnd_tunables.kib_dev_failover > 1 ||
2950                 dev->ibd_can_failover ||
2951                 dev->ibd_hdev == NULL);
2952
2953         rc = kiblnd_dev_need_failover(dev, ns);
2954         if (rc <= 0)
2955                 goto out;
2956
2957         if (dev->ibd_hdev != NULL &&
2958             dev->ibd_hdev->ibh_cmid != NULL) {
2959                 /* XXX it's not good to close old listener at here,
2960                  * because we can fail to create new listener.
2961                  * But we have to close it now, otherwise rdma_bind_addr
2962                  * will return EADDRINUSE... How crap! */
2963                 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2964
2965                 cmid = dev->ibd_hdev->ibh_cmid;
2966                 /* make next schedule of kiblnd_dev_need_failover()
2967                  * return 1 for me */
2968                 dev->ibd_hdev->ibh_cmid  = NULL;
2969                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2970
2971                 rdma_destroy_id(cmid);
2972         }
2973
2974         cmid = kiblnd_rdma_create_id(ns, kiblnd_cm_callback, dev, RDMA_PS_TCP,
2975                                      IB_QPT_RC);
2976         if (IS_ERR(cmid)) {
2977                 rc = PTR_ERR(cmid);
2978                 CERROR("Failed to create cmid for failover: %d\n", rc);
2979                 goto out;
2980         }
2981
2982         memset(&addr, 0, sizeof(addr));
2983         addr.sin_family      = AF_INET;
2984         addr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2985         addr.sin_port        = htons(*kiblnd_tunables.kib_service);
2986
2987         /* Bind to failover device or port */
2988         rc = rdma_bind_addr(cmid, (struct sockaddr *)&addr);
2989         if (rc != 0 || cmid->device == NULL) {
2990                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2991                        dev->ibd_ifname, &dev->ibd_ifip,
2992                        cmid->device, rc);
2993                 if (!rc && !cmid->device)
2994                         set_fatal = false;
2995                 rdma_destroy_id(cmid);
2996                 goto out;
2997         }
2998
2999         LIBCFS_ALLOC(hdev, sizeof(*hdev));
3000         if (hdev == NULL) {
3001                 CERROR("Failed to allocate kib_hca_dev\n");
3002                 rdma_destroy_id(cmid);
3003                 rc = -ENOMEM;
3004                 goto out;
3005         }
3006
3007         atomic_set(&hdev->ibh_ref, 1);
3008         hdev->ibh_dev   = dev;
3009         hdev->ibh_cmid  = cmid;
3010         hdev->ibh_ibdev = cmid->device;
3011         hdev->ibh_port  = cmid->port_num;
3012
3013 #ifdef HAVE_IB_ALLOC_PD_2ARGS
3014         pd = ib_alloc_pd(cmid->device, 0);
3015 #else
3016         pd = ib_alloc_pd(cmid->device);
3017 #endif
3018         if (IS_ERR(pd)) {
3019                 rc = PTR_ERR(pd);
3020                 CERROR("Can't allocate PD: %d\n", rc);
3021                 goto out;
3022         }
3023
3024         hdev->ibh_pd = pd;
3025
3026         rc = rdma_listen(cmid, 0);
3027         if (rc != 0) {
3028                 CERROR("Can't start new listener: %d\n", rc);
3029                 goto out;
3030         }
3031
3032         rc = kiblnd_hdev_get_attr(hdev);
3033         if (rc != 0) {
3034                 CERROR("Can't get device attributes: %d\n", rc);
3035                 goto out;
3036         }
3037
3038 #ifdef HAVE_IB_GET_DMA_MR
3039         rc = kiblnd_hdev_setup_mrs(hdev);
3040         if (rc != 0) {
3041                 CERROR("Can't setup device: %d\n", rc);
3042                 goto out;
3043         }
3044 #endif
3045
3046         INIT_IB_EVENT_HANDLER(&hdev->ibh_event_handler,
3047                                 hdev->ibh_ibdev, kiblnd_event_handler);
3048         ib_register_event_handler(&hdev->ibh_event_handler);
3049
3050         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3051
3052         old = dev->ibd_hdev;
3053         dev->ibd_hdev = hdev;   /* take over the refcount */
3054         hdev = old;
3055
3056         list_for_each_entry(net, &dev->ibd_nets, ibn_list) {
3057                 cfs_cpt_for_each(i, lnet_cpt_table()) {
3058                         kiblnd_fail_poolset(&net->ibn_tx_ps[i]->tps_poolset,
3059                                             &zombie_tpo);
3060
3061                         if (net->ibn_fmr_ps != NULL)
3062                                 kiblnd_fail_fmr_poolset(net->ibn_fmr_ps[i],
3063                                                         &zombie_fpo);
3064                 }
3065         }
3066
3067         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3068  out:
3069         if (!list_empty(&zombie_tpo))
3070                 kiblnd_destroy_pool_list(&zombie_tpo);
3071         if (!list_empty(&zombie_ppo))
3072                 kiblnd_destroy_pool_list(&zombie_ppo);
3073         if (!list_empty(&zombie_fpo))
3074                 kiblnd_destroy_fmr_pool_list(&zombie_fpo);
3075         if (hdev != NULL)
3076                 kiblnd_hdev_decref(hdev);
3077
3078         if (rc != 0) {
3079                 dev->ibd_failed_failover++;
3080         } else {
3081                 dev->ibd_failed_failover = 0;
3082
3083                 if (set_fatal) {
3084                         rcu_read_lock();
3085                         netdev = dev_get_by_name_rcu(ns, dev->ibd_ifname);
3086                         if (netdev && (lnet_get_link_status(netdev) == 1))
3087                                 kiblnd_set_ni_fatal_on(dev->ibd_hdev, 0);
3088                         rcu_read_unlock();
3089                 }
3090         }
3091
3092         return rc;
3093 }
3094
3095 void
3096 kiblnd_destroy_dev(struct kib_dev *dev)
3097 {
3098         LASSERT(dev->ibd_nnets == 0);
3099         LASSERT(list_empty(&dev->ibd_nets));
3100
3101         list_del(&dev->ibd_fail_list);
3102         list_del(&dev->ibd_list);
3103
3104         if (dev->ibd_hdev != NULL)
3105                 kiblnd_hdev_decref(dev->ibd_hdev);
3106
3107         LIBCFS_FREE(dev, sizeof(*dev));
3108 }
3109
3110 static struct kib_dev *
3111 kiblnd_dev_search(char *ifname)
3112 {
3113         struct kib_dev *alias = NULL;
3114         struct kib_dev *dev;
3115         char *colon;
3116         char *colon2;
3117
3118         colon = strchr(ifname, ':');
3119         list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3120                 if (strcmp(&dev->ibd_ifname[0], ifname) == 0)
3121                         return dev;
3122
3123                 if (alias != NULL)
3124                         continue;
3125
3126                 colon2 = strchr(dev->ibd_ifname, ':');
3127                 if (colon != NULL)
3128                         *colon = 0;
3129                 if (colon2 != NULL)
3130                         *colon2 = 0;
3131
3132                 if (strcmp(&dev->ibd_ifname[0], ifname) == 0)
3133                         alias = dev;
3134
3135                 if (colon != NULL)
3136                         *colon = ':';
3137                 if (colon2 != NULL)
3138                         *colon2 = ':';
3139         }
3140         return alias;
3141 }
3142
3143 static int
3144 kiblnd_handle_link_state_change(struct net_device *dev,
3145                                 unsigned char operstate)
3146 {
3147         struct lnet_ni *ni = NULL;
3148         struct kib_dev *event_kibdev;
3149         struct kib_net *net;
3150         struct kib_net *cnxt;
3151         bool link_down = !(operstate == IF_OPER_UP);
3152         struct in_device *in_dev;
3153         bool found_ip = false;
3154         __u32 ni_state_before;
3155         bool update_ping_buf = false;
3156         int state;
3157         DECLARE_CONST_IN_IFADDR(ifa);
3158
3159         event_kibdev = kiblnd_dev_search(dev->name);
3160
3161         if (!event_kibdev)
3162                 goto out;
3163
3164         list_for_each_entry_safe(net, cnxt, &event_kibdev->ibd_nets, ibn_list) {
3165                 found_ip = false;
3166                 ni = net->ibn_ni;
3167
3168                 in_dev = __in_dev_get_rtnl(dev);
3169                 if (!in_dev) {
3170                         CDEBUG(D_NET, "Interface %s has no IPv4 status.\n",
3171                                dev->name);
3172                         ni_state_before = lnet_set_link_fatal_state(ni, 1);
3173                         goto ni_done;
3174                 }
3175                 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3176                         if (htonl(event_kibdev->ibd_ifip) == ifa->ifa_local)
3177                                 found_ip = true;
3178                 }
3179                 endfor_ifa(in_dev);
3180
3181                 if (!found_ip) {
3182                         CDEBUG(D_NET, "Interface %s has no matching ip\n",
3183                                dev->name);
3184                         ni_state_before = lnet_set_link_fatal_state(ni, 1);
3185                         goto ni_done;
3186                 }
3187
3188                 if (link_down) {
3189                         ni_state_before = lnet_set_link_fatal_state(ni, 1);
3190                 } else {
3191                         state = (lnet_get_link_status(dev) == 0);
3192                         ni_state_before = lnet_set_link_fatal_state(ni,
3193                                                                     state);
3194                 }
3195 ni_done:
3196                 if (!update_ping_buf &&
3197                     (ni->ni_state == LNET_NI_STATE_ACTIVE) &&
3198                     (atomic_read(&ni->ni_fatal_error_on) != ni_state_before) &&
3199                     (net->ibn_init == IBLND_INIT_ALL))
3200                         update_ping_buf = true;
3201         }
3202
3203         if (update_ping_buf)
3204                 lnet_mark_ping_buffer_for_update();
3205 out:
3206         return 0;
3207 }
3208
3209 static int
3210 kiblnd_handle_inetaddr_change(struct in_ifaddr *ifa, unsigned long event)
3211 {
3212         struct kib_dev *event_kibdev;
3213         struct kib_net *net;
3214         struct kib_net *cnxt;
3215         struct net_device *event_netdev = ifa->ifa_dev->dev;
3216         __u32 ni_state_before;
3217         bool update_ping_buf = false;
3218         struct lnet_ni *ni = NULL;
3219         bool link_down;
3220
3221         event_kibdev = kiblnd_dev_search(event_netdev->name);
3222
3223         if (!event_kibdev)
3224                 goto out;
3225
3226         if (htonl(event_kibdev->ibd_ifip) != ifa->ifa_local)
3227                 goto out;
3228
3229         list_for_each_entry_safe(net, cnxt, &event_kibdev->ibd_nets,
3230                                  ibn_list) {
3231                 ni = net->ibn_ni;
3232                 link_down = (event == NETDEV_DOWN);
3233                 ni_state_before = lnet_set_link_fatal_state(ni, link_down);
3234                 if (!update_ping_buf &&
3235                     (ni->ni_state == LNET_NI_STATE_ACTIVE) &&
3236                     ((event == NETDEV_DOWN) != ni_state_before) &&
3237                     (net->ibn_init == IBLND_INIT_ALL))
3238                         update_ping_buf = true;
3239         }
3240
3241         if (update_ping_buf)
3242                 lnet_mark_ping_buffer_for_update();
3243 out:
3244         return 0;
3245 }
3246
3247
3248 /************************************
3249  * Net device notifier event handler
3250  ************************************/
3251 static int kiblnd_device_event(struct notifier_block *unused,
3252                                  unsigned long event, void *ptr)
3253 {
3254         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3255         unsigned char operstate;
3256
3257         operstate = dev->operstate;
3258
3259         CDEBUG(D_NET, "devevent: status=%ld, iface=%s ifindex %d state %u\n",
3260                event, dev->name, dev->ifindex, operstate);
3261
3262         switch (event) {
3263         case NETDEV_UP:
3264         case NETDEV_DOWN:
3265         case NETDEV_CHANGE:
3266                 kiblnd_handle_link_state_change(dev, operstate);
3267                 break;
3268         }
3269
3270         return NOTIFY_OK;
3271 }
3272
3273 /************************************
3274  * Inetaddr notifier event handler
3275  ************************************/
3276 static int kiblnd_inetaddr_event(struct notifier_block *unused,
3277                                  unsigned long event, void *ptr)
3278 {
3279         struct in_ifaddr *ifa = ptr;
3280
3281         CDEBUG(D_NET, "addrevent: status %ld ip addr %pI4, netmask %pI4.\n",
3282                event, &ifa->ifa_address, &ifa->ifa_mask);
3283
3284         switch (event) {
3285         case NETDEV_UP:
3286         case NETDEV_DOWN:
3287         case NETDEV_CHANGE:
3288                 kiblnd_handle_inetaddr_change(ifa, event);
3289                 break;
3290
3291         }
3292         return NOTIFY_OK;
3293 }
3294
3295 static struct notifier_block kiblnd_dev_notifier_block = {
3296         .notifier_call = kiblnd_device_event,
3297 };
3298
3299 static struct notifier_block kiblnd_inetaddr_notifier_block = {
3300         .notifier_call = kiblnd_inetaddr_event,
3301 };
3302
3303 static void
3304 kiblnd_base_shutdown(void)
3305 {
3306         struct kib_sched_info *sched;
3307         struct kib_peer_ni *peer_ni;
3308         int i;
3309
3310         LASSERT(list_empty(&kiblnd_data.kib_devs));
3311
3312         CDEBUG(D_MALLOC, "before LND base cleanup: kmem %lld\n",
3313                libcfs_kmem_read());
3314
3315         if (kiblnd_data.kib_init == IBLND_INIT_ALL) {
3316                 unregister_netdevice_notifier(&kiblnd_dev_notifier_block);
3317                 unregister_inetaddr_notifier(&kiblnd_inetaddr_notifier_block);
3318         }
3319
3320         switch (kiblnd_data.kib_init) {
3321         default:
3322                 LBUG();
3323
3324         case IBLND_INIT_ALL:
3325         case IBLND_INIT_DATA:
3326                 hash_for_each(kiblnd_data.kib_peers, i, peer_ni, ibp_list)
3327                         LASSERT(0);
3328                 LASSERT(list_empty(&kiblnd_data.kib_connd_zombies));
3329                 LASSERT(list_empty(&kiblnd_data.kib_connd_conns));
3330                 LASSERT(list_empty(&kiblnd_data.kib_reconn_list));
3331                 LASSERT(list_empty(&kiblnd_data.kib_reconn_wait));
3332
3333                 /* flag threads to terminate; wake and wait for them to die */
3334                 kiblnd_data.kib_shutdown = 1;
3335
3336                 /* NB: we really want to stop scheduler threads net by net
3337                  * instead of the whole module, this should be improved
3338                  * with dynamic configuration LNet.
3339                  */
3340                 cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds)
3341                         wake_up_all(&sched->ibs_waitq);
3342
3343                 wake_up(&kiblnd_data.kib_connd_waitq);
3344                 wake_up(&kiblnd_data.kib_failover_waitq);
3345
3346                 wait_var_event_warning(&kiblnd_data.kib_nthreads,
3347                                        !atomic_read(&kiblnd_data.kib_nthreads),
3348                                        "Waiting for %d threads to terminate\n",
3349                                        atomic_read(&kiblnd_data.kib_nthreads));
3350                 fallthrough;
3351
3352         case IBLND_INIT_NOTHING:
3353                 break;
3354         }
3355
3356         if (kiblnd_data.kib_scheds != NULL)
3357                 cfs_percpt_free(kiblnd_data.kib_scheds);
3358
3359         CDEBUG(D_MALLOC, "after LND base cleanup: kmem %lld\n",
3360                libcfs_kmem_read());
3361
3362         kiblnd_data.kib_init = IBLND_INIT_NOTHING;
3363         module_put(THIS_MODULE);
3364 }
3365
3366 static void
3367 kiblnd_shutdown(struct lnet_ni *ni)
3368 {
3369         struct kib_net *net = ni->ni_data;
3370         rwlock_t     *g_lock = &kiblnd_data.kib_global_lock;
3371         unsigned long     flags;
3372
3373         LASSERT(kiblnd_data.kib_init == IBLND_INIT_ALL);
3374
3375         if (net == NULL)
3376                 goto out;
3377
3378         CDEBUG(D_MALLOC, "before LND net cleanup: kmem %lld\n",
3379                libcfs_kmem_read());
3380
3381         write_lock_irqsave(g_lock, flags);
3382         net->ibn_shutdown = 1;
3383         write_unlock_irqrestore(g_lock, flags);
3384
3385         switch (net->ibn_init) {
3386         default:
3387                 LBUG();
3388
3389         case IBLND_INIT_ALL:
3390                 /* nuke all existing peers within this net */
3391                 kiblnd_del_peer(ni, LNET_NID_ANY);
3392
3393                 /* Wait for all peer_ni state to clean up */
3394                 wait_var_event_warning(&net->ibn_npeers,
3395                                        atomic_read(&net->ibn_npeers) == 0,
3396                                        "%s: waiting for %d peers to disconnect\n",
3397                                        libcfs_nidstr(&ni->ni_nid),
3398                                        atomic_read(&net->ibn_npeers));
3399
3400                 kiblnd_net_fini_pools(net);
3401
3402                 write_lock_irqsave(g_lock, flags);
3403                 LASSERT(net->ibn_dev->ibd_nnets > 0);
3404                 net->ibn_dev->ibd_nnets--;
3405                 list_del(&net->ibn_list);
3406                 write_unlock_irqrestore(g_lock, flags);
3407
3408                 wake_up_all(&kiblnd_data.kib_connd_waitq);
3409                 wait_var_event_warning(&net->ibn_nconns,
3410                                        atomic_read(&net->ibn_nconns) == 0,
3411                                        "%s: waiting for %d conns to clean\n",
3412                                        libcfs_nidstr(&ni->ni_nid),
3413                                        atomic_read(&net->ibn_nconns));
3414                 fallthrough;
3415
3416         case IBLND_INIT_NOTHING:
3417                 LASSERT (atomic_read(&net->ibn_nconns) == 0);
3418
3419                 if (net->ibn_dev != NULL &&
3420                     net->ibn_dev->ibd_nnets == 0)
3421                         kiblnd_destroy_dev(net->ibn_dev);
3422
3423                 break;
3424         }
3425
3426         CDEBUG(D_MALLOC, "after LND net cleanup: kmem %lld\n",
3427                libcfs_kmem_read());
3428
3429         net->ibn_init = IBLND_INIT_NOTHING;
3430         ni->ni_data = NULL;
3431
3432         LIBCFS_FREE(net, sizeof(*net));
3433
3434 out:
3435         if (list_empty(&kiblnd_data.kib_devs))
3436                 kiblnd_base_shutdown();
3437 }
3438
3439 static int
3440 kiblnd_base_startup(struct net *ns)
3441 {
3442         struct kib_sched_info *sched;
3443         int rc;
3444         int i;
3445
3446         LASSERT(kiblnd_data.kib_init == IBLND_INIT_NOTHING);
3447
3448         if (!try_module_get(THIS_MODULE))
3449                 goto failed;
3450
3451         memset(&kiblnd_data, 0, sizeof(kiblnd_data)); /* zero pointers, flags etc */
3452
3453         rwlock_init(&kiblnd_data.kib_global_lock);
3454
3455         INIT_LIST_HEAD(&kiblnd_data.kib_devs);
3456         INIT_LIST_HEAD(&kiblnd_data.kib_failed_devs);
3457
3458         hash_init(kiblnd_data.kib_peers);
3459
3460         spin_lock_init(&kiblnd_data.kib_connd_lock);
3461         INIT_LIST_HEAD(&kiblnd_data.kib_connd_conns);
3462         INIT_LIST_HEAD(&kiblnd_data.kib_connd_waits);
3463         INIT_LIST_HEAD(&kiblnd_data.kib_connd_zombies);
3464         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_list);
3465         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_wait);
3466
3467         init_waitqueue_head(&kiblnd_data.kib_connd_waitq);
3468         init_waitqueue_head(&kiblnd_data.kib_failover_waitq);
3469
3470         kiblnd_data.kib_scheds = cfs_percpt_alloc(lnet_cpt_table(),
3471                                                   sizeof(*sched));
3472         if (kiblnd_data.kib_scheds == NULL)
3473                 goto failed;
3474
3475         cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
3476                 int     nthrs;
3477
3478                 spin_lock_init(&sched->ibs_lock);
3479                 INIT_LIST_HEAD(&sched->ibs_conns);
3480                 init_waitqueue_head(&sched->ibs_waitq);
3481
3482                 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
3483                 if (*kiblnd_tunables.kib_nscheds > 0) {
3484                         nthrs = min(nthrs, *kiblnd_tunables.kib_nscheds);
3485                 } else {
3486                         /* max to half of CPUs, another half is reserved for
3487                          * upper layer modules */
3488                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
3489                 }
3490
3491                 sched->ibs_nthreads_max = nthrs;
3492                 sched->ibs_cpt = i;
3493         }
3494
3495         kiblnd_data.kib_error_qpa.qp_state = IB_QPS_ERR;
3496
3497         /* lists/ptrs/locks initialised */
3498         kiblnd_data.kib_init = IBLND_INIT_DATA;
3499         /*****************************************************/
3500
3501         rc = kiblnd_thread_start(kiblnd_connd, NULL, "kiblnd_connd");
3502         if (rc != 0) {
3503                 CERROR("Can't spawn o2iblnd connd: %d\n", rc);
3504                 goto failed;
3505         }
3506
3507         if (*kiblnd_tunables.kib_dev_failover != 0)
3508                 rc = kiblnd_thread_start(kiblnd_failover_thread, ns,
3509                                          "kiblnd_failover");
3510
3511         if (rc != 0) {
3512                 CERROR("Can't spawn o2iblnd failover thread: %d\n", rc);
3513                 goto failed;
3514         }
3515
3516         register_netdevice_notifier(&kiblnd_dev_notifier_block);
3517         register_inetaddr_notifier(&kiblnd_inetaddr_notifier_block);
3518
3519         /* flag everything initialised */
3520         kiblnd_data.kib_init = IBLND_INIT_ALL;
3521         /*****************************************************/
3522
3523         return 0;
3524
3525  failed:
3526         kiblnd_base_shutdown();
3527         return -ENETDOWN;
3528 }
3529
3530 static int
3531 kiblnd_start_schedulers(struct kib_sched_info *sched)
3532 {
3533         int     rc = 0;
3534         int     nthrs;
3535         int     i;
3536
3537         if (sched->ibs_nthreads == 0) {
3538                 if (*kiblnd_tunables.kib_nscheds > 0) {
3539                         nthrs = sched->ibs_nthreads_max;
3540                 } else {
3541                         nthrs = cfs_cpt_weight(lnet_cpt_table(),
3542                                                sched->ibs_cpt);
3543                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
3544                         nthrs = min(IBLND_N_SCHED_HIGH, nthrs);
3545                 }
3546         } else {
3547                 LASSERT(sched->ibs_nthreads <= sched->ibs_nthreads_max);
3548                 /* increase one thread if there is new interface */
3549                 nthrs = (sched->ibs_nthreads < sched->ibs_nthreads_max);
3550         }
3551
3552         for (i = 0; i < nthrs; i++) {
3553                 long    id = KIB_THREAD_ID(sched->ibs_cpt, sched->ibs_nthreads + i);
3554
3555                 rc = kiblnd_thread_start(kiblnd_scheduler, (void *)id,
3556                                          "kiblnd_sd_%02ld_%02ld",
3557                                          KIB_THREAD_CPT(id), KIB_THREAD_TID(id));
3558                 if (rc == 0)
3559                         continue;
3560
3561                 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
3562                        sched->ibs_cpt, sched->ibs_nthreads + i, rc);
3563                 break;
3564         }
3565
3566         sched->ibs_nthreads += i;
3567         return rc;
3568 }
3569
3570 static int kiblnd_dev_start_threads(struct kib_dev *dev, bool newdev, u32 *cpts,
3571                                     int ncpts)
3572 {
3573         int     cpt;
3574         int     rc;
3575         int     i;
3576
3577         for (i = 0; i < ncpts; i++) {
3578                 struct kib_sched_info *sched;
3579
3580                 cpt = (cpts == NULL) ? i : cpts[i];
3581                 sched = kiblnd_data.kib_scheds[cpt];
3582
3583                 if (!newdev && sched->ibs_nthreads > 0)
3584                         continue;
3585
3586                 rc = kiblnd_start_schedulers(kiblnd_data.kib_scheds[cpt]);
3587                 if (rc != 0) {
3588                         CERROR("Failed to start scheduler threads for %s\n",
3589                                dev->ibd_ifname);
3590                         return rc;
3591                 }
3592         }
3593         return 0;
3594 }
3595
3596 static int
3597 kiblnd_startup(struct lnet_ni *ni)
3598 {
3599         char *ifname = NULL;
3600         struct lnet_inetdev *ifaces = NULL;
3601         struct kib_dev *ibdev = NULL;
3602         struct kib_net *net = NULL;
3603         unsigned long flags;
3604         int rc;
3605         int i;
3606         bool newdev;
3607         struct net_device *netdev;
3608
3609         LASSERT(ni->ni_net->net_lnd == &the_o2iblnd);
3610
3611         if (kiblnd_data.kib_init == IBLND_INIT_NOTHING) {
3612                 rc = kiblnd_base_startup(ni->ni_net_ns);
3613                 if (rc != 0)
3614                         return rc;
3615         }
3616
3617         LIBCFS_ALLOC(net, sizeof(*net));
3618         ni->ni_data = net;
3619         if (net == NULL) {
3620                 rc = -ENOMEM;
3621                 goto failed;
3622         }
3623
3624         net->ibn_ni = ni;
3625         net->ibn_incarnation = ktime_get_real_ns() / NSEC_PER_USEC;
3626
3627         kiblnd_tunables_setup(ni);
3628
3629         /* Multi-Rail wants each secondary
3630          * IP to be treated as an unique 'struct ni' interface.
3631          */
3632         if (ni->ni_interface != NULL) {
3633                 /* Use the IPoIB interface specified in 'networks=' */
3634                 ifname = ni->ni_interface;
3635         } else {
3636                 ifname = *kiblnd_tunables.kib_default_ipif;
3637                 rc = libcfs_strnid(&ni->ni_nid, ifname);
3638                 if (rc < 0 || ni->ni_nid.nid_type != O2IBLND)
3639                         memset(&ni->ni_nid, 0, sizeof(ni->ni_nid));
3640         }
3641
3642         if (strlen(ifname) >= sizeof(ibdev->ibd_ifname)) {
3643                 CERROR("IPoIB interface name too long: %s\n", ifname);
3644                 rc = -E2BIG;
3645                 goto failed;
3646         }
3647
3648         rc = lnet_inet_enumerate(&ifaces, ni->ni_net_ns, false);
3649         if (rc < 0)
3650                 goto failed;
3651
3652         i = lnet_inet_select(ni, ifaces, rc);
3653         if (i < 0)
3654                 goto failed;
3655
3656         if (nid_addr_is_set(&ni->ni_nid)) {
3657                 strscpy(ifname, ifaces[i].li_name, sizeof(ifname));
3658         } else if (strcmp(ifname, ifaces[i].li_name) != 0) {
3659                 CERROR("ko2iblnd: No matching interfaces\n");
3660                 rc = -ENOENT;
3661                 goto failed;
3662         }
3663
3664         ibdev = kiblnd_dev_search(ifname);
3665         newdev = ibdev == NULL;
3666         /* hmm...create kib_dev even for alias */
3667         if (ibdev == NULL || strcmp(&ibdev->ibd_ifname[0], ifname) != 0) {
3668                 LIBCFS_ALLOC(ibdev, sizeof(*ibdev));
3669                 if (!ibdev) {
3670                         rc = -ENOMEM;
3671                         goto failed;
3672                 }
3673
3674                 ibdev->ibd_ifip = ntohl(ifaces[i].li_ipaddr);
3675                 strlcpy(ibdev->ibd_ifname, ifaces[i].li_name,
3676                         sizeof(ibdev->ibd_ifname));
3677                 ibdev->ibd_can_failover = ifaces[i].li_iff_master;
3678
3679                 INIT_LIST_HEAD(&ibdev->ibd_nets);
3680                 INIT_LIST_HEAD(&ibdev->ibd_list); /* not yet in kib_devs */
3681                 INIT_LIST_HEAD(&ibdev->ibd_fail_list);
3682
3683                 /* initialize the device */
3684                 rc = kiblnd_dev_failover(ibdev, ni->ni_net_ns);
3685                 if (rc) {
3686                         CERROR("ko2iblnd: Can't initialize device: rc = %d\n",
3687                                rc);
3688                         goto failed;
3689                 }
3690
3691                 list_add_tail(&ibdev->ibd_list, &kiblnd_data.kib_devs);
3692         }
3693
3694         net->ibn_dev = ibdev;
3695         ni->ni_nid.nid_addr[0] = cpu_to_be32(ibdev->ibd_ifip);
3696         if (!ni->ni_interface) {
3697                 rc = lnet_ni_add_interface(ni, ifaces[i].li_name);
3698                 if (rc < 0)
3699                         CWARN("ko2iblnd failed to allocate ni_interface\n");
3700         }
3701         ni->ni_dev_cpt = ifaces[i].li_cpt;
3702
3703         rc = kiblnd_dev_start_threads(ibdev, newdev, ni->ni_cpts, ni->ni_ncpts);
3704         if (rc != 0)
3705                 goto failed;
3706
3707         rc = kiblnd_net_init_pools(net, ni, ni->ni_cpts, ni->ni_ncpts);
3708         if (rc != 0) {
3709                 CERROR("Failed to initialize NI pools: %d\n", rc);
3710                 goto failed;
3711         }
3712
3713         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3714         ibdev->ibd_nnets++;
3715         list_add_tail(&net->ibn_list, &ibdev->ibd_nets);
3716         /* for health check */
3717         if (ibdev->ibd_hdev->ibh_state == IBLND_DEV_PORT_DOWN)
3718                 kiblnd_set_ni_fatal_on(ibdev->ibd_hdev, 1);
3719
3720         rcu_read_lock();
3721         netdev = dev_get_by_name_rcu(ni->ni_net_ns, net->ibn_dev->ibd_ifname);
3722         if (((netdev->reg_state == NETREG_UNREGISTERING) ||
3723              (netdev->operstate != IF_OPER_UP)) ||
3724             (lnet_get_link_status(netdev) == 0)) {
3725                 kiblnd_set_ni_fatal_on(ibdev->ibd_hdev, 1);
3726         }
3727         rcu_read_unlock();
3728
3729         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3730
3731         net->ibn_init = IBLND_INIT_ALL;
3732
3733         return 0;
3734
3735 failed:
3736         if (net != NULL && net->ibn_dev == NULL && ibdev != NULL)
3737                 kiblnd_destroy_dev(ibdev);
3738
3739         kfree(ifaces);
3740         kiblnd_shutdown(ni);
3741
3742         CDEBUG(D_NET, "Configuration of device %s failed: rc = %d\n",
3743                ifname ? ifname : "", rc);
3744
3745         return -ENETDOWN;
3746 }
3747
3748 static const struct lnet_lnd the_o2iblnd = {
3749         .lnd_type       = O2IBLND,
3750         .lnd_startup    = kiblnd_startup,
3751         .lnd_shutdown   = kiblnd_shutdown,
3752         .lnd_ctl        = kiblnd_ctl,
3753         .lnd_send       = kiblnd_send,
3754         .lnd_recv       = kiblnd_recv,
3755         .lnd_get_dev_prio = kiblnd_get_dev_prio,
3756         .lnd_nl_get     = kiblnd_nl_get,
3757         .lnd_nl_set     = kiblnd_nl_set,
3758         .lnd_keys       = &kiblnd_tunables_keys,
3759 };
3760
3761 static void ko2inlnd_assert_wire_constants(void)
3762 {
3763         BUILD_BUG_ON(IBLND_MSG_MAGIC != 0x0be91b91);
3764         BUILD_BUG_ON(IBLND_MSG_VERSION_1 != 0x11);
3765         BUILD_BUG_ON(IBLND_MSG_VERSION_2 != 0x12);
3766         BUILD_BUG_ON(IBLND_MSG_VERSION != IBLND_MSG_VERSION_2);
3767
3768         BUILD_BUG_ON(IBLND_MSG_CONNREQ != 0xc0);
3769         BUILD_BUG_ON(IBLND_MSG_CONNACK != 0xc1);
3770         BUILD_BUG_ON(IBLND_MSG_NOOP != 0xd0);
3771         BUILD_BUG_ON(IBLND_MSG_IMMEDIATE != 0xd1);
3772         BUILD_BUG_ON(IBLND_MSG_PUT_REQ != 0xd2);
3773         BUILD_BUG_ON(IBLND_MSG_PUT_NAK != 0xd3);
3774         BUILD_BUG_ON(IBLND_MSG_PUT_ACK != 0xd4);
3775         BUILD_BUG_ON(IBLND_MSG_PUT_DONE != 0xd5);
3776         BUILD_BUG_ON(IBLND_MSG_GET_REQ != 0xd6);
3777         BUILD_BUG_ON(IBLND_MSG_GET_DONE != 0xd7);
3778
3779         BUILD_BUG_ON(IBLND_REJECT_CONN_RACE != 1);
3780         BUILD_BUG_ON(IBLND_REJECT_NO_RESOURCES != 2);
3781         BUILD_BUG_ON(IBLND_REJECT_FATAL != 3);
3782         BUILD_BUG_ON(IBLND_REJECT_CONN_UNCOMPAT != 4);
3783         BUILD_BUG_ON(IBLND_REJECT_CONN_STALE != 5);
3784         BUILD_BUG_ON(IBLND_REJECT_RDMA_FRAGS != 6);
3785         BUILD_BUG_ON(IBLND_REJECT_MSG_QUEUE_SIZE != 7);
3786         BUILD_BUG_ON(IBLND_REJECT_INVALID_SRV_ID != 8);
3787
3788         BUILD_BUG_ON((int)sizeof(struct kib_connparams) != 8);
3789         BUILD_BUG_ON((int)offsetof(struct kib_connparams, ibcp_queue_depth) != 0);
3790         BUILD_BUG_ON((int)sizeof(((struct kib_connparams *)0)->ibcp_queue_depth) != 2);
3791         BUILD_BUG_ON((int)offsetof(struct kib_connparams, ibcp_max_frags) != 2);
3792         BUILD_BUG_ON((int)sizeof(((struct kib_connparams *)0)->ibcp_max_frags) != 2);
3793         BUILD_BUG_ON((int)offsetof(struct kib_connparams, ibcp_max_msg_size) != 4);
3794         BUILD_BUG_ON((int)sizeof(((struct kib_connparams *)0)->ibcp_max_msg_size) != 4);
3795
3796         BUILD_BUG_ON((int)sizeof(struct kib_immediate_msg) != 72);
3797         BUILD_BUG_ON((int)offsetof(struct kib_immediate_msg, ibim_hdr) != 0);
3798         BUILD_BUG_ON((int)sizeof(((struct kib_immediate_msg *)0)->ibim_hdr) != 72);
3799         BUILD_BUG_ON((int)offsetof(struct kib_immediate_msg, ibim_payload) != 72);
3800         BUILD_BUG_ON((int)sizeof(((struct kib_immediate_msg *)0)->ibim_payload) != 0);
3801
3802         BUILD_BUG_ON((int)sizeof(struct kib_rdma_frag) != 12);
3803         BUILD_BUG_ON((int)offsetof(struct kib_rdma_frag, rf_nob) != 0);
3804         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_frag *)0)->rf_nob) != 4);
3805         BUILD_BUG_ON((int)offsetof(struct kib_rdma_frag, rf_addr) != 4);
3806         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_frag *)0)->rf_addr) != 8);
3807
3808         BUILD_BUG_ON((int)sizeof(struct kib_rdma_desc) != 8);
3809         BUILD_BUG_ON((int)offsetof(struct kib_rdma_desc, rd_key) != 0);
3810         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_desc *)0)->rd_key) != 4);
3811         BUILD_BUG_ON((int)offsetof(struct kib_rdma_desc, rd_nfrags) != 4);
3812         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_desc *)0)->rd_nfrags) != 4);
3813         BUILD_BUG_ON((int)offsetof(struct kib_rdma_desc, rd_frags) != 8);
3814         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_desc *)0)->rd_frags) != 0);
3815
3816         BUILD_BUG_ON((int)sizeof(struct kib_putreq_msg) != 80);
3817         BUILD_BUG_ON((int)offsetof(struct kib_putreq_msg, ibprm_hdr) != 0);
3818         BUILD_BUG_ON((int)sizeof(((struct kib_putreq_msg *)0)->ibprm_hdr) != 72);
3819         BUILD_BUG_ON((int)offsetof(struct kib_putreq_msg, ibprm_cookie) != 72);
3820         BUILD_BUG_ON((int)sizeof(((struct kib_putreq_msg *)0)->ibprm_cookie) != 8);
3821
3822         BUILD_BUG_ON((int)sizeof(struct kib_putack_msg) != 24);
3823         BUILD_BUG_ON((int)offsetof(struct kib_putack_msg, ibpam_src_cookie) != 0);
3824         BUILD_BUG_ON((int)sizeof(((struct kib_putack_msg *)0)->ibpam_src_cookie) != 8);
3825         BUILD_BUG_ON((int)offsetof(struct kib_putack_msg, ibpam_dst_cookie) != 8);
3826         BUILD_BUG_ON((int)sizeof(((struct kib_putack_msg *)0)->ibpam_dst_cookie) != 8);
3827         BUILD_BUG_ON((int)offsetof(struct kib_putack_msg, ibpam_rd) != 16);
3828         BUILD_BUG_ON((int)sizeof(((struct kib_putack_msg *)0)->ibpam_rd) != 8);
3829
3830         BUILD_BUG_ON((int)sizeof(struct kib_get_msg) != 88);
3831         BUILD_BUG_ON((int)offsetof(struct kib_get_msg, ibgm_hdr) != 0);
3832         BUILD_BUG_ON((int)sizeof(((struct kib_get_msg *)0)->ibgm_hdr) != 72);
3833         BUILD_BUG_ON((int)offsetof(struct kib_get_msg, ibgm_cookie) != 72);
3834         BUILD_BUG_ON((int)sizeof(((struct kib_get_msg *)0)->ibgm_cookie) != 8);
3835         BUILD_BUG_ON((int)offsetof(struct kib_get_msg, ibgm_rd) != 80);
3836         BUILD_BUG_ON((int)sizeof(((struct kib_get_msg *)0)->ibgm_rd) != 8);
3837
3838         BUILD_BUG_ON((int)sizeof(struct kib_completion_msg) != 12);
3839         BUILD_BUG_ON((int)offsetof(struct kib_completion_msg, ibcm_cookie) != 0);
3840         BUILD_BUG_ON((int)sizeof(((struct kib_completion_msg *)0)->ibcm_cookie) != 8);
3841         BUILD_BUG_ON((int)offsetof(struct kib_completion_msg, ibcm_status) != 8);
3842         BUILD_BUG_ON((int)sizeof(((struct kib_completion_msg *)0)->ibcm_status) != 4);
3843
3844         /* Checks for struct kib_msg */
3845         //BUILD_BUG_ON((int)sizeof(struct kib_msg) != 12);
3846         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_magic) != 0);
3847         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_magic) != 4);
3848         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_version) != 4);
3849         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_version) != 2);
3850         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_type) != 6);
3851         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_type) != 1);
3852         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_credits) != 7);
3853         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_credits) != 1);
3854         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_nob) != 8);
3855         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_nob) != 4);
3856         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_cksum) != 12);
3857         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_cksum) != 4);
3858         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_srcnid) != 16);
3859         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_srcnid) != 8);
3860         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_srcstamp) != 24);
3861         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_srcstamp) != 8);
3862         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_dstnid) != 32);
3863         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_dstnid) != 8);
3864         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_dststamp) != 40);
3865         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_dststamp) != 8);
3866
3867         /* Connparams */
3868         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.connparams.ibcp_queue_depth) != 48);
3869         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.connparams.ibcp_queue_depth) != 2);
3870         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.connparams.ibcp_max_frags) != 50);
3871         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.connparams.ibcp_max_frags) != 2);
3872         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.connparams.ibcp_max_msg_size) != 52);
3873         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.connparams.ibcp_max_msg_size) != 4);
3874
3875         /* Immediate message */
3876         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.immediate.ibim_hdr) != 48);
3877         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.immediate.ibim_hdr) != 72);
3878         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.immediate.ibim_payload) != 120);
3879         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.immediate.ibim_payload) != 0);
3880
3881         /* PUT req message */
3882         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putreq.ibprm_hdr) != 48);
3883         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putreq.ibprm_hdr) != 72);
3884         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putreq.ibprm_cookie) != 120);
3885         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putreq.ibprm_cookie) != 8);
3886
3887         /* Put ACK */
3888         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putack.ibpam_src_cookie) != 48);
3889         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putack.ibpam_src_cookie) != 8);
3890         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putack.ibpam_dst_cookie) != 56);
3891         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putack.ibpam_dst_cookie) != 8);
3892         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putack.ibpam_rd) != 64);
3893         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putack.ibpam_rd) != 8);
3894
3895         /* GET message */
3896         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.get.ibgm_hdr) != 48);
3897         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.get.ibgm_hdr) != 72);
3898         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.get.ibgm_cookie) != 120);
3899         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.get.ibgm_cookie) != 8);
3900         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.get.ibgm_rd) != 128);
3901         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.get.ibgm_rd) != 8);
3902
3903         /* Completion message */
3904         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.completion.ibcm_cookie) != 48);
3905         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.completion.ibcm_cookie) != 8);
3906         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.completion.ibcm_status) != 56);
3907         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.completion.ibcm_status) != 4);
3908
3909         /* Sanity checks */
3910         BUILD_BUG_ON(sizeof(struct kib_msg) > IBLND_MSG_SIZE);
3911         BUILD_BUG_ON(offsetof(struct kib_msg,
3912                      ibm_u.get.ibgm_rd.rd_frags[IBLND_MAX_RDMA_FRAGS]) >
3913                      IBLND_MSG_SIZE);
3914         BUILD_BUG_ON(offsetof(struct kib_msg,
3915                      ibm_u.putack.ibpam_rd.rd_frags[IBLND_MAX_RDMA_FRAGS]) >
3916                      IBLND_MSG_SIZE);
3917 }
3918
3919 static void __exit ko2iblnd_exit(void)
3920 {
3921         lnet_unregister_lnd(&the_o2iblnd);
3922 }
3923
3924 static int __init ko2iblnd_init(void)
3925 {
3926         int rc;
3927
3928         ko2inlnd_assert_wire_constants();
3929
3930         rc = kiblnd_tunables_init();
3931         if (rc != 0)
3932                 return rc;
3933
3934         lnet_register_lnd(&the_o2iblnd);
3935
3936         return 0;
3937 }
3938
3939 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3940 MODULE_DESCRIPTION("OpenIB gen2 LNet Network Driver");
3941 MODULE_VERSION("2.8.0");
3942 MODULE_LICENSE("GPL");
3943
3944 module_init(ko2iblnd_init);
3945 module_exit(ko2iblnd_exit);