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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2015, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lnet/klnds/o2iblnd/o2iblnd.c
  37  *
  38  * Author: Eric Barton <eric@bartonsoftware.com>
  39  */
  40
  41 #include <asm/page.h>
  42 #include "o2iblnd.h"
  43
  44 static lnd_t the_o2iblnd;
  45
  46 kib_data_t              kiblnd_data;
  47
  48 static __u32
  49 kiblnd_cksum (void *ptr, int nob)
  50 {
  51         char  *c  = ptr;
  52         __u32  sum = 0;
  53
  54         while (nob-- > 0)
  55                 sum = ((sum << 1) | (sum >> 31)) + *c++;
  56
  57         /* ensure I don't return 0 (== no checksum) */
  58         return (sum == 0) ? 1 : sum;
  59 }
  60
  61 static char *
  62 kiblnd_msgtype2str(int type)
  63 {
  64         switch (type) {
  65         case IBLND_MSG_CONNREQ:
  66                 return "CONNREQ";
  67
  68         case IBLND_MSG_CONNACK:
  69                 return "CONNACK";
  70
  71         case IBLND_MSG_NOOP:
  72                 return "NOOP";
  73
  74         case IBLND_MSG_IMMEDIATE:
  75                 return "IMMEDIATE";
  76
  77         case IBLND_MSG_PUT_REQ:
  78                 return "PUT_REQ";
  79
  80         case IBLND_MSG_PUT_NAK:
  81                 return "PUT_NAK";
  82
  83         case IBLND_MSG_PUT_ACK:
  84                 return "PUT_ACK";
  85
  86         case IBLND_MSG_PUT_DONE:
  87                 return "PUT_DONE";
  88
  89         case IBLND_MSG_GET_REQ:
  90                 return "GET_REQ";
  91
  92         case IBLND_MSG_GET_DONE:
  93                 return "GET_DONE";
  94
  95         default:
  96                 return "???";
  97         }
  98 }
  99
 100 static int
 101 kiblnd_msgtype2size(int type)
 102 {
 103         const int hdr_size = offsetof(kib_msg_t, ibm_u);
 104
 105         switch (type) {
 106         case IBLND_MSG_CONNREQ:
 107         case IBLND_MSG_CONNACK:
 108                 return hdr_size + sizeof(kib_connparams_t);
 109
 110         case IBLND_MSG_NOOP:
 111                 return hdr_size;
 112
 113         case IBLND_MSG_IMMEDIATE:
 114                 return offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[0]);
 115
 116         case IBLND_MSG_PUT_REQ:
 117                 return hdr_size + sizeof(kib_putreq_msg_t);
 118
 119         case IBLND_MSG_PUT_ACK:
 120                 return hdr_size + sizeof(kib_putack_msg_t);
 121
 122         case IBLND_MSG_GET_REQ:
 123                 return hdr_size + sizeof(kib_get_msg_t);
 124
 125         case IBLND_MSG_PUT_NAK:
 126         case IBLND_MSG_PUT_DONE:
 127         case IBLND_MSG_GET_DONE:
 128                 return hdr_size + sizeof(kib_completion_msg_t);
 129         default:
 130                 return -1;
 131         }
 132 }
 133
 134 static int
 135 kiblnd_unpack_rd(kib_msg_t *msg, int flip)
 136 {
 137         kib_rdma_desc_t   *rd;
 138         int msg_size;
 139         int                nob;
 140         int                n;
 141         int                i;
 142
 143         LASSERT (msg->ibm_type == IBLND_MSG_GET_REQ ||
 144                  msg->ibm_type == IBLND_MSG_PUT_ACK);
 145
 146         rd = msg->ibm_type == IBLND_MSG_GET_REQ ?
 147                               &msg->ibm_u.get.ibgm_rd :
 148                               &msg->ibm_u.putack.ibpam_rd;
 149
 150         if (flip) {
 151                 __swab32s(&rd->rd_key);
 152                 __swab32s(&rd->rd_nfrags);
 153         }
 154
 155         n = rd->rd_nfrags;
 156         nob = offsetof (kib_msg_t, ibm_u) +
 157               kiblnd_rd_msg_size(rd, msg->ibm_type, n);
 158
 159         if (msg->ibm_nob < nob) {
 160                 CERROR("Short %s: %d(%d)\n",
 161                        kiblnd_msgtype2str(msg->ibm_type), msg->ibm_nob, nob);
 162                 return 1;
 163         }
 164
 165         msg_size = kiblnd_rd_size(rd);
 166         if (msg_size <= 0 || msg_size > LNET_MAX_PAYLOAD) {
 167                 CERROR("Bad msg_size: %d, should be 0 < n <= %d\n",
 168                        msg_size, LNET_MAX_PAYLOAD);
 169                 return 1;
 170         }
 171
 172         if (!flip)
 173                 return 0;
 174
 175         for (i = 0; i < n; i++) {
 176                 __swab32s(&rd->rd_frags[i].rf_nob);
 177                 __swab64s(&rd->rd_frags[i].rf_addr);
 178         }
 179
 180         return 0;
 181 }
 182
 183 void
 184 kiblnd_pack_msg (lnet_ni_t *ni, kib_msg_t *msg, int version,
 185                  int credits, lnet_nid_t dstnid, __u64 dststamp)
 186 {
 187         kib_net_t *net = ni->ni_data;
 188
 189         /* CAVEAT EMPTOR! all message fields not set here should have been
 190          * initialised previously. */
 191         msg->ibm_magic    = IBLND_MSG_MAGIC;
 192         msg->ibm_version  = version;
 193         /*   ibm_type */
 194         msg->ibm_credits  = credits;
 195         /*   ibm_nob */
 196         msg->ibm_cksum    = 0;
 197         msg->ibm_srcnid   = ni->ni_nid;
 198         msg->ibm_srcstamp = net->ibn_incarnation;
 199         msg->ibm_dstnid   = dstnid;
 200         msg->ibm_dststamp = dststamp;
 201
 202         if (*kiblnd_tunables.kib_cksum) {
 203                 /* NB ibm_cksum zero while computing cksum */
 204                 msg->ibm_cksum = kiblnd_cksum(msg, msg->ibm_nob);
 205         }
 206 }
 207
 208 int
 209 kiblnd_unpack_msg(kib_msg_t *msg, int nob)
 210 {
 211         const int hdr_size = offsetof(kib_msg_t, ibm_u);
 212         __u32     msg_cksum;
 213         __u16     version;
 214         int       msg_nob;
 215         int       flip;
 216
 217         /* 6 bytes are enough to have received magic + version */
 218         if (nob < 6) {
 219                 CERROR("Short message: %d\n", nob);
 220                 return -EPROTO;
 221         }
 222
 223         if (msg->ibm_magic == IBLND_MSG_MAGIC) {
 224                 flip = 0;
 225         } else if (msg->ibm_magic == __swab32(IBLND_MSG_MAGIC)) {
 226                 flip = 1;
 227         } else {
 228                 CERROR("Bad magic: %08x\n", msg->ibm_magic);
 229                 return -EPROTO;
 230         }
 231
 232         version = flip ? __swab16(msg->ibm_version) : msg->ibm_version;
 233         if (version != IBLND_MSG_VERSION &&
 234             version != IBLND_MSG_VERSION_1) {
 235                 CERROR("Bad version: %x\n", version);
 236                 return -EPROTO;
 237         }
 238
 239         if (nob < hdr_size) {
 240                 CERROR("Short message: %d\n", nob);
 241                 return -EPROTO;
 242         }
 243
 244         msg_nob = flip ? __swab32(msg->ibm_nob) : msg->ibm_nob;
 245         if (msg_nob > nob) {
 246                 CERROR("Short message: got %d, wanted %d\n", nob, msg_nob);
 247                 return -EPROTO;
 248         }
 249
 250         /* checksum must be computed with ibm_cksum zero and BEFORE anything
 251          * gets flipped */
 252         msg_cksum = flip ? __swab32(msg->ibm_cksum) : msg->ibm_cksum;
 253         msg->ibm_cksum = 0;
 254         if (msg_cksum != 0 &&
 255             msg_cksum != kiblnd_cksum(msg, msg_nob)) {
 256                 CERROR("Bad checksum\n");
 257                 return -EPROTO;
 258         }
 259
 260         msg->ibm_cksum = msg_cksum;
 261
 262         if (flip) {
 263                 /* leave magic unflipped as a clue to peer endianness */
 264                 msg->ibm_version = version;
 265                 CLASSERT (sizeof(msg->ibm_type) == 1);
 266                 CLASSERT (sizeof(msg->ibm_credits) == 1);
 267                 msg->ibm_nob     = msg_nob;
 268                 __swab64s(&msg->ibm_srcnid);
 269                 __swab64s(&msg->ibm_srcstamp);
 270                 __swab64s(&msg->ibm_dstnid);
 271                 __swab64s(&msg->ibm_dststamp);
 272         }
 273
 274         if (msg->ibm_srcnid == LNET_NID_ANY) {
 275                 CERROR("Bad src nid: %s\n", libcfs_nid2str(msg->ibm_srcnid));
 276                 return -EPROTO;
 277         }
 278
 279         if (msg_nob < kiblnd_msgtype2size(msg->ibm_type)) {
 280                 CERROR("Short %s: %d(%d)\n", kiblnd_msgtype2str(msg->ibm_type),
 281                        msg_nob, kiblnd_msgtype2size(msg->ibm_type));
 282                 return -EPROTO;
 283         }
 284
 285         switch (msg->ibm_type) {
 286         default:
 287                 CERROR("Unknown message type %x\n", msg->ibm_type);
 288                 return -EPROTO;
 289
 290         case IBLND_MSG_NOOP:
 291         case IBLND_MSG_IMMEDIATE:
 292         case IBLND_MSG_PUT_REQ:
 293                 break;
 294
 295         case IBLND_MSG_PUT_ACK:
 296         case IBLND_MSG_GET_REQ:
 297                 if (kiblnd_unpack_rd(msg, flip))
 298                         return -EPROTO;
 299                 break;
 300
 301         case IBLND_MSG_PUT_NAK:
 302         case IBLND_MSG_PUT_DONE:
 303         case IBLND_MSG_GET_DONE:
 304                 if (flip)
 305                         __swab32s(&msg->ibm_u.completion.ibcm_status);
 306                 break;
 307
 308         case IBLND_MSG_CONNREQ:
 309         case IBLND_MSG_CONNACK:
 310                 if (flip) {
 311                         __swab16s(&msg->ibm_u.connparams.ibcp_queue_depth);
 312                         __swab16s(&msg->ibm_u.connparams.ibcp_max_frags);
 313                         __swab32s(&msg->ibm_u.connparams.ibcp_max_msg_size);
 314                 }
 315                 break;
 316         }
 317         return 0;
 318 }
 319
 320 int
 321 kiblnd_create_peer(lnet_ni_t *ni, kib_peer_t **peerp, lnet_nid_t nid)
 322 {
 323         kib_peer_t      *peer;
 324         kib_net_t       *net = ni->ni_data;
 325         int             cpt = lnet_cpt_of_nid(nid);
 326         unsigned long   flags;
 327
 328         LASSERT(net != NULL);
 329         LASSERT(nid != LNET_NID_ANY);
 330
 331         LIBCFS_CPT_ALLOC(peer, lnet_cpt_table(), cpt, sizeof(*peer));
 332         if (peer == NULL) {
 333                 CERROR("Cannot allocate peer\n");
 334                 return -ENOMEM;
 335         }
 336
 337         peer->ibp_ni = ni;
 338         peer->ibp_nid = nid;
 339         peer->ibp_error = 0;
 340         peer->ibp_last_alive = 0;
 341         peer->ibp_max_frags = kiblnd_cfg_rdma_frags(peer->ibp_ni);
 342         peer->ibp_queue_depth = ni->ni_peertxcredits;
 343         atomic_set(&peer->ibp_refcount, 1);     /* 1 ref for caller */
 344
 345         INIT_LIST_HEAD(&peer->ibp_list);        /* not in the peer table yet */
 346         INIT_LIST_HEAD(&peer->ibp_conns);
 347         INIT_LIST_HEAD(&peer->ibp_tx_queue);
 348
 349         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 350
 351         /* always called with a ref on ni, which prevents ni being shutdown */
 352         LASSERT(net->ibn_shutdown == 0);
 353
 354         /* npeers only grows with the global lock held */
 355         atomic_inc(&net->ibn_npeers);
 356
 357         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 358
 359         *peerp = peer;
 360         return 0;
 361 }
 362
 363 void
 364 kiblnd_destroy_peer (kib_peer_t *peer)
 365 {
 366         kib_net_t *net = peer->ibp_ni->ni_data;
 367
 368         LASSERT(net != NULL);
 369         LASSERT (atomic_read(&peer->ibp_refcount) == 0);
 370         LASSERT(!kiblnd_peer_active(peer));
 371         LASSERT(kiblnd_peer_idle(peer));
 372         LASSERT(list_empty(&peer->ibp_tx_queue));
 373
 374         LIBCFS_FREE(peer, sizeof(*peer));
 375
 376         /* NB a peer's connections keep a reference on their peer until
 377          * they are destroyed, so we can be assured that _all_ state to do
 378          * with this peer has been cleaned up when its refcount drops to
 379          * zero. */
 380         atomic_dec(&net->ibn_npeers);
 381 }
 382
 383 kib_peer_t *
 384 kiblnd_find_peer_locked (lnet_nid_t nid)
 385 {
 386         /* the caller is responsible for accounting the additional reference
 387          * that this creates */
 388         struct list_head        *peer_list = kiblnd_nid2peerlist(nid);
 389         struct list_head        *tmp;
 390         kib_peer_t              *peer;
 391
 392         list_for_each(tmp, peer_list) {
 393
 394                 peer = list_entry(tmp, kib_peer_t, ibp_list);
 395                 LASSERT(!kiblnd_peer_idle(peer));
 396
 397                 if (peer->ibp_nid != nid)
 398                         continue;
 399
 400                 CDEBUG(D_NET, "got peer [%p] -> %s (%d) version: %x\n",
 401                        peer, libcfs_nid2str(nid),
 402                        atomic_read(&peer->ibp_refcount),
 403                        peer->ibp_version);
 404                 return peer;
 405         }
 406         return NULL;
 407 }
 408
 409 void
 410 kiblnd_unlink_peer_locked (kib_peer_t *peer)
 411 {
 412         LASSERT(list_empty(&peer->ibp_conns));
 413
 414         LASSERT (kiblnd_peer_active(peer));
 415         list_del_init(&peer->ibp_list);
 416         /* lose peerlist's ref */
 417         kiblnd_peer_decref(peer);
 418 }
 419
 420 static int
 421 kiblnd_get_peer_info(lnet_ni_t *ni, int index,
 422                      lnet_nid_t *nidp, int *count)
 423 {
 424         kib_peer_t              *peer;
 425         struct list_head        *ptmp;
 426         int                      i;
 427         unsigned long            flags;
 428
 429         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 430
 431         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
 432
 433                 list_for_each(ptmp, &kiblnd_data.kib_peers[i]) {
 434
 435                         peer = list_entry(ptmp, kib_peer_t, ibp_list);
 436                         LASSERT(!kiblnd_peer_idle(peer));
 437
 438                         if (peer->ibp_ni != ni)
 439                                 continue;
 440
 441                         if (index-- > 0)
 442                                 continue;
 443
 444                         *nidp = peer->ibp_nid;
 445                         *count = atomic_read(&peer->ibp_refcount);
 446
 447                         read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
 448                                                flags);
 449                         return 0;
 450                 }
 451         }
 452
 453         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 454         return -ENOENT;
 455 }
 456
 457 static void
 458 kiblnd_del_peer_locked (kib_peer_t *peer)
 459 {
 460         struct list_head        *ctmp;
 461         struct list_head        *cnxt;
 462         kib_conn_t              *conn;
 463
 464         if (list_empty(&peer->ibp_conns)) {
 465                 kiblnd_unlink_peer_locked(peer);
 466         } else {
 467                 list_for_each_safe(ctmp, cnxt, &peer->ibp_conns) {
 468                         conn = list_entry(ctmp, kib_conn_t, ibc_list);
 469
 470                         kiblnd_close_conn_locked(conn, 0);
 471                 }
 472                 /* NB closing peer's last conn unlinked it. */
 473         }
 474         /* NB peer now unlinked; might even be freed if the peer table had the
 475          * last ref on it. */
 476 }
 477
 478 static int
 479 kiblnd_del_peer (lnet_ni_t *ni, lnet_nid_t nid)
 480 {
 481         struct list_head        zombies = LIST_HEAD_INIT(zombies);
 482         struct list_head        *ptmp;
 483         struct list_head        *pnxt;
 484         kib_peer_t              *peer;
 485         int                     lo;
 486         int                     hi;
 487         int                     i;
 488         unsigned long           flags;
 489         int                     rc = -ENOENT;
 490
 491         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 492
 493         if (nid != LNET_NID_ANY) {
 494                 lo = hi = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
 495         } else {
 496                 lo = 0;
 497                 hi = kiblnd_data.kib_peer_hash_size - 1;
 498         }
 499
 500         for (i = lo; i <= hi; i++) {
 501                 list_for_each_safe(ptmp, pnxt, &kiblnd_data.kib_peers[i]) {
 502                         peer = list_entry(ptmp, kib_peer_t, ibp_list);
 503                         LASSERT(!kiblnd_peer_idle(peer));
 504
 505                         if (peer->ibp_ni != ni)
 506                                 continue;
 507
 508                         if (!(nid == LNET_NID_ANY || peer->ibp_nid == nid))
 509                                 continue;
 510
 511                         if (!list_empty(&peer->ibp_tx_queue)) {
 512                                 LASSERT(list_empty(&peer->ibp_conns));
 513
 514                                 list_splice_init(&peer->ibp_tx_queue,
 515                                                  &zombies);
 516                         }
 517
 518                         kiblnd_del_peer_locked(peer);
 519                         rc = 0;         /* matched something */
 520                 }
 521         }
 522
 523         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 524
 525         kiblnd_txlist_done(ni, &zombies, -EIO);
 526
 527         return rc;
 528 }
 529
 530 static kib_conn_t *
 531 kiblnd_get_conn_by_idx(lnet_ni_t *ni, int index)
 532 {
 533         kib_peer_t              *peer;
 534         struct list_head        *ptmp;
 535         kib_conn_t              *conn;
 536         struct list_head        *ctmp;
 537         int                     i;
 538         unsigned long           flags;
 539
 540         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 541
 542         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
 543                 list_for_each(ptmp, &kiblnd_data.kib_peers[i]) {
 544
 545                         peer = list_entry(ptmp, kib_peer_t, ibp_list);
 546                         LASSERT(!kiblnd_peer_idle(peer));
 547
 548                         if (peer->ibp_ni != ni)
 549                                 continue;
 550
 551                         list_for_each(ctmp, &peer->ibp_conns) {
 552                                 if (index-- > 0)
 553                                         continue;
 554
 555                                 conn = list_entry(ctmp, kib_conn_t, ibc_list);
 556                                 kiblnd_conn_addref(conn);
 557                                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
 558                                                        flags);
 559                                 return conn;
 560                         }
 561                 }
 562         }
 563
 564         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 565         return NULL;
 566 }
 567
 568 static void
 569 kiblnd_debug_rx (kib_rx_t *rx)
 570 {
 571         CDEBUG(D_CONSOLE, "      %p status %d msg_type %x cred %d\n",
 572                rx, rx->rx_status, rx->rx_msg->ibm_type,
 573                rx->rx_msg->ibm_credits);
 574 }
 575
 576 static void
 577 kiblnd_debug_tx (kib_tx_t *tx)
 578 {
 579         CDEBUG(D_CONSOLE, "      %p snd %d q %d w %d rc %d dl %lx "
 580                "cookie %#llx msg %s%s type %x cred %d\n",
 581                tx, tx->tx_sending, tx->tx_queued, tx->tx_waiting,
 582                tx->tx_status, tx->tx_deadline, tx->tx_cookie,
 583                tx->tx_lntmsg[0] == NULL ? "-" : "!",
 584                tx->tx_lntmsg[1] == NULL ? "-" : "!",
 585                tx->tx_msg->ibm_type, tx->tx_msg->ibm_credits);
 586 }
 587
 588 void
 589 kiblnd_debug_conn (kib_conn_t *conn)
 590 {
 591         struct list_head        *tmp;
 592         int                     i;
 593
 594         spin_lock(&conn->ibc_lock);
 595
 596         CDEBUG(D_CONSOLE, "conn[%d] %p [version %x] -> %s:\n",
 597                atomic_read(&conn->ibc_refcount), conn,
 598                conn->ibc_version, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 599         CDEBUG(D_CONSOLE, "   state %d nposted %d/%d cred %d o_cred %d "
 600                " r_cred %d\n", conn->ibc_state, conn->ibc_noops_posted,
 601                conn->ibc_nsends_posted, conn->ibc_credits,
 602                conn->ibc_outstanding_credits, conn->ibc_reserved_credits);
 603         CDEBUG(D_CONSOLE, "   comms_err %d\n", conn->ibc_comms_error);
 604
 605         CDEBUG(D_CONSOLE, "   early_rxs:\n");
 606         list_for_each(tmp, &conn->ibc_early_rxs)
 607                 kiblnd_debug_rx(list_entry(tmp, kib_rx_t, rx_list));
 608
 609         CDEBUG(D_CONSOLE, "   tx_noops:\n");
 610         list_for_each(tmp, &conn->ibc_tx_noops)
 611                 kiblnd_debug_tx(list_entry(tmp, kib_tx_t, tx_list));
 612
 613         CDEBUG(D_CONSOLE, "   tx_queue_nocred:\n");
 614         list_for_each(tmp, &conn->ibc_tx_queue_nocred)
 615                 kiblnd_debug_tx(list_entry(tmp, kib_tx_t, tx_list));
 616
 617         CDEBUG(D_CONSOLE, "   tx_queue_rsrvd:\n");
 618         list_for_each(tmp, &conn->ibc_tx_queue_rsrvd)
 619                 kiblnd_debug_tx(list_entry(tmp, kib_tx_t, tx_list));
 620
 621         CDEBUG(D_CONSOLE, "   tx_queue:\n");
 622         list_for_each(tmp, &conn->ibc_tx_queue)
 623                 kiblnd_debug_tx(list_entry(tmp, kib_tx_t, tx_list));
 624
 625         CDEBUG(D_CONSOLE, "   active_txs:\n");
 626         list_for_each(tmp, &conn->ibc_active_txs)
 627                 kiblnd_debug_tx(list_entry(tmp, kib_tx_t, tx_list));
 628
 629         CDEBUG(D_CONSOLE, "   rxs:\n");
 630         for (i = 0; i < IBLND_RX_MSGS(conn); i++)
 631                 kiblnd_debug_rx(&conn->ibc_rxs[i]);
 632
 633         spin_unlock(&conn->ibc_lock);
 634 }
 635
 636 int
 637 kiblnd_translate_mtu(int value)
 638 {
 639         switch (value) {
 640         default:
 641                 return -1;
 642         case 0:
 643                 return 0;
 644         case 256:
 645                 return IB_MTU_256;
 646         case 512:
 647                 return IB_MTU_512;
 648         case 1024:
 649                 return IB_MTU_1024;
 650         case 2048:
 651                 return IB_MTU_2048;
 652         case 4096:
 653                 return IB_MTU_4096;
 654         }
 655 }
 656
 657 static void
 658 kiblnd_setup_mtu_locked(struct rdma_cm_id *cmid)
 659 {
 660         int           mtu;
 661
 662         /* XXX There is no path record for iWARP, set by netdev->change_mtu? */
 663         if (cmid->route.path_rec == NULL)
 664                 return;
 665
 666         mtu = kiblnd_translate_mtu(*kiblnd_tunables.kib_ib_mtu);
 667         LASSERT (mtu >= 0);
 668         if (mtu != 0)
 669                 cmid->route.path_rec->mtu = mtu;
 670 }
 671
 672 static int
 673 kiblnd_get_completion_vector(kib_conn_t *conn, int cpt)
 674 {
 675         cpumask_t       *mask;
 676         int             vectors;
 677         int             off;
 678         int             i;
 679         lnet_nid_t      ibp_nid;
 680
 681         vectors = conn->ibc_cmid->device->num_comp_vectors;
 682         if (vectors <= 1)
 683                 return 0;
 684
 685         mask = cfs_cpt_cpumask(lnet_cpt_table(), cpt);
 686
 687         /* hash NID to CPU id in this partition... */
 688         ibp_nid = conn->ibc_peer->ibp_nid;
 689         off = do_div(ibp_nid, cpumask_weight(mask));
 690         for_each_cpu(i, mask) {
 691                 if (off-- == 0)
 692                         return i % vectors;
 693         }
 694
 695         LBUG();
 696         return 1;
 697 }
 698
 699 kib_conn_t *
 700 kiblnd_create_conn(kib_peer_t *peer, struct rdma_cm_id *cmid,
 701                    int state, int version)
 702 {
 703         /* CAVEAT EMPTOR:
 704          * If the new conn is created successfully it takes over the caller's
 705          * ref on 'peer'.  It also "owns" 'cmid' and destroys it when it itself
 706          * is destroyed.  On failure, the caller's ref on 'peer' remains and
 707          * she must dispose of 'cmid'.  (Actually I'd block forever if I tried
 708          * to destroy 'cmid' here since I'm called from the CM which still has
 709          * its ref on 'cmid'). */
 710         rwlock_t               *glock = &kiblnd_data.kib_global_lock;
 711         kib_net_t              *net = peer->ibp_ni->ni_data;
 712         kib_dev_t              *dev;
 713         struct ib_qp_init_attr *init_qp_attr;
 714         struct kib_sched_info   *sched;
 715 #ifdef HAVE_IB_CQ_INIT_ATTR
 716         struct ib_cq_init_attr  cq_attr = {};
 717 #endif
 718         kib_conn_t              *conn;
 719         struct ib_cq            *cq;
 720         unsigned long           flags;
 721         int                     cpt;
 722         int                     rc;
 723         int                     i;
 724
 725         LASSERT(net != NULL);
 726         LASSERT(!in_interrupt());
 727
 728         dev = net->ibn_dev;
 729
 730         cpt = lnet_cpt_of_nid(peer->ibp_nid);
 731         sched = kiblnd_data.kib_scheds[cpt];
 732
 733         LASSERT(sched->ibs_nthreads > 0);
 734
 735         LIBCFS_CPT_ALLOC(init_qp_attr, lnet_cpt_table(), cpt,
 736                          sizeof(*init_qp_attr));
 737         if (init_qp_attr == NULL) {
 738                 CERROR("Can't allocate qp_attr for %s\n",
 739                        libcfs_nid2str(peer->ibp_nid));
 740                 goto failed_0;
 741         }
 742
 743         LIBCFS_CPT_ALLOC(conn, lnet_cpt_table(), cpt, sizeof(*conn));
 744         if (conn == NULL) {
 745                 CERROR("Can't allocate connection for %s\n",
 746                        libcfs_nid2str(peer->ibp_nid));
 747                 goto failed_1;
 748         }
 749
 750         conn->ibc_state = IBLND_CONN_INIT;
 751         conn->ibc_version = version;
 752         conn->ibc_peer = peer;                  /* I take the caller's ref */
 753         cmid->context = conn;                   /* for future CM callbacks */
 754         conn->ibc_cmid = cmid;
 755         conn->ibc_max_frags = peer->ibp_max_frags;
 756         conn->ibc_queue_depth = peer->ibp_queue_depth;
 757
 758         INIT_LIST_HEAD(&conn->ibc_early_rxs);
 759         INIT_LIST_HEAD(&conn->ibc_tx_noops);
 760         INIT_LIST_HEAD(&conn->ibc_tx_queue);
 761         INIT_LIST_HEAD(&conn->ibc_tx_queue_rsrvd);
 762         INIT_LIST_HEAD(&conn->ibc_tx_queue_nocred);
 763         INIT_LIST_HEAD(&conn->ibc_active_txs);
 764         spin_lock_init(&conn->ibc_lock);
 765
 766         LIBCFS_CPT_ALLOC(conn->ibc_connvars, lnet_cpt_table(), cpt,
 767                          sizeof(*conn->ibc_connvars));
 768         if (conn->ibc_connvars == NULL) {
 769                 CERROR("Can't allocate in-progress connection state\n");
 770                 goto failed_2;
 771         }
 772
 773         write_lock_irqsave(glock, flags);
 774         if (dev->ibd_failover) {
 775                 write_unlock_irqrestore(glock, flags);
 776                 CERROR("%s: failover in progress\n", dev->ibd_ifname);
 777                 goto failed_2;
 778         }
 779
 780         if (dev->ibd_hdev->ibh_ibdev != cmid->device) {
 781                 /* wakeup failover thread and teardown connection */
 782                 if (kiblnd_dev_can_failover(dev)) {
 783                         list_add_tail(&dev->ibd_fail_list,
 784                                       &kiblnd_data.kib_failed_devs);
 785                         wake_up(&kiblnd_data.kib_failover_waitq);
 786                 }
 787
 788                 write_unlock_irqrestore(glock, flags);
 789                 CERROR("cmid HCA(%s), kib_dev(%s) need failover\n",
 790                        cmid->device->name, dev->ibd_ifname);
 791                 goto failed_2;
 792         }
 793
 794         kiblnd_hdev_addref_locked(dev->ibd_hdev);
 795         conn->ibc_hdev = dev->ibd_hdev;
 796
 797         kiblnd_setup_mtu_locked(cmid);
 798
 799         write_unlock_irqrestore(glock, flags);
 800
 801         LIBCFS_CPT_ALLOC(conn->ibc_rxs, lnet_cpt_table(), cpt,
 802                          IBLND_RX_MSGS(conn) * sizeof(kib_rx_t));
 803         if (conn->ibc_rxs == NULL) {
 804                 CERROR("Cannot allocate RX buffers\n");
 805                 goto failed_2;
 806         }
 807
 808         rc = kiblnd_alloc_pages(&conn->ibc_rx_pages, cpt,
 809                                 IBLND_RX_MSG_PAGES(conn));
 810         if (rc != 0)
 811                 goto failed_2;
 812
 813         kiblnd_map_rx_descs(conn);
 814
 815 #ifdef HAVE_IB_CQ_INIT_ATTR
 816         cq_attr.cqe = IBLND_CQ_ENTRIES(conn);
 817         cq_attr.comp_vector = kiblnd_get_completion_vector(conn, cpt);
 818         cq = ib_create_cq(cmid->device,
 819                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 820                           &cq_attr);
 821 #else
 822         cq = ib_create_cq(cmid->device,
 823                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 824                           IBLND_CQ_ENTRIES(conn),
 825                           kiblnd_get_completion_vector(conn, cpt));
 826 #endif
 827         if (IS_ERR(cq)) {
 828                 CERROR("Failed to create CQ with %d CQEs: %ld\n",
 829                         IBLND_CQ_ENTRIES(conn), PTR_ERR(cq));
 830                 goto failed_2;
 831         }
 832
 833         conn->ibc_cq = cq;
 834
 835         rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 836         if (rc != 0) {
 837                 CERROR("Can't request completion notification: %d\n", rc);
 838                 goto failed_2;
 839         }
 840
 841         init_qp_attr->event_handler = kiblnd_qp_event;
 842         init_qp_attr->qp_context = conn;
 843         init_qp_attr->cap.max_send_wr = IBLND_SEND_WRS(conn);
 844         init_qp_attr->cap.max_recv_wr = IBLND_RECV_WRS(conn);
 845         init_qp_attr->cap.max_send_sge = 1;
 846         init_qp_attr->cap.max_recv_sge = 1;
 847         init_qp_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
 848         init_qp_attr->qp_type = IB_QPT_RC;
 849         init_qp_attr->send_cq = cq;
 850         init_qp_attr->recv_cq = cq;
 851
 852         conn->ibc_sched = sched;
 853
 854         do {
 855                 rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd, init_qp_attr);
 856                 if (!rc || init_qp_attr->cap.max_send_wr < 16)
 857                         break;
 858
 859                 init_qp_attr->cap.max_send_wr -= init_qp_attr->cap.max_send_wr / 4;
 860         } while (rc);
 861
 862         if (rc) {
 863                 CERROR("Can't create QP: %d, send_wr: %d, recv_wr: %d\n",
 864                         rc, init_qp_attr->cap.max_send_wr,
 865                         init_qp_attr->cap.max_recv_wr);
 866                 goto failed_2;
 867         }
 868
 869         if (init_qp_attr->cap.max_send_wr != IBLND_SEND_WRS(conn))
 870                 CDEBUG(D_NET, "original send wr %d, created with %d\n",
 871                         IBLND_SEND_WRS(conn), init_qp_attr->cap.max_send_wr);
 872
 873         LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
 874
 875         /* 1 ref for caller and each rxmsg */
 876         atomic_set(&conn->ibc_refcount, 1 + IBLND_RX_MSGS(conn));
 877         conn->ibc_nrx = IBLND_RX_MSGS(conn);
 878
 879         /* post receives */
 880         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
 881                 rc = kiblnd_post_rx(&conn->ibc_rxs[i], IBLND_POSTRX_NO_CREDIT);
 882                 if (rc != 0) {
 883                         CERROR("Can't post rxmsg: %d\n", rc);
 884
 885                         /* Make posted receives complete */
 886                         kiblnd_abort_receives(conn);
 887
 888                         /* correct # of posted buffers
 889                          * NB locking needed now I'm racing with completion */
 890                         spin_lock_irqsave(&sched->ibs_lock, flags);
 891                         conn->ibc_nrx -= IBLND_RX_MSGS(conn) - i;
 892                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
 893
 894                         /* cmid will be destroyed by CM(ofed) after cm_callback
 895                          * returned, so we can't refer it anymore
 896                          * (by kiblnd_connd()->kiblnd_destroy_conn) */
 897                         rdma_destroy_qp(conn->ibc_cmid);
 898                         conn->ibc_cmid = NULL;
 899
 900                         /* Drop my own and unused rxbuffer refcounts */
 901                         while (i++ <= IBLND_RX_MSGS(conn))
 902                                 kiblnd_conn_decref(conn);
 903
 904                         return NULL;
 905                 }
 906         }
 907
 908         /* Init successful! */
 909         LASSERT (state == IBLND_CONN_ACTIVE_CONNECT ||
 910                  state == IBLND_CONN_PASSIVE_WAIT);
 911         conn->ibc_state = state;
 912
 913         /* 1 more conn */
 914         atomic_inc(&net->ibn_nconns);
 915         return conn;
 916
 917  failed_2:
 918         kiblnd_destroy_conn(conn, true);
 919  failed_1:
 920         LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
 921  failed_0:
 922         return NULL;
 923 }
 924
 925 void
 926 kiblnd_destroy_conn(kib_conn_t *conn, bool free_conn)
 927 {
 928         struct rdma_cm_id *cmid = conn->ibc_cmid;
 929         kib_peer_t        *peer = conn->ibc_peer;
 930         int                rc;
 931
 932         LASSERT (!in_interrupt());
 933         LASSERT (atomic_read(&conn->ibc_refcount) == 0);
 934         LASSERT(list_empty(&conn->ibc_early_rxs));
 935         LASSERT(list_empty(&conn->ibc_tx_noops));
 936         LASSERT(list_empty(&conn->ibc_tx_queue));
 937         LASSERT(list_empty(&conn->ibc_tx_queue_rsrvd));
 938         LASSERT(list_empty(&conn->ibc_tx_queue_nocred));
 939         LASSERT(list_empty(&conn->ibc_active_txs));
 940         LASSERT (conn->ibc_noops_posted == 0);
 941         LASSERT (conn->ibc_nsends_posted == 0);
 942
 943         switch (conn->ibc_state) {
 944         default:
 945                 /* conn must be completely disengaged from the network */
 946                 LBUG();
 947
 948         case IBLND_CONN_DISCONNECTED:
 949                 /* connvars should have been freed already */
 950                 LASSERT (conn->ibc_connvars == NULL);
 951                 break;
 952
 953         case IBLND_CONN_INIT:
 954                 break;
 955         }
 956
 957         /* conn->ibc_cmid might be destroyed by CM already */
 958         if (cmid != NULL && cmid->qp != NULL)
 959                 rdma_destroy_qp(cmid);
 960
 961         if (conn->ibc_cq != NULL) {
 962                 rc = ib_destroy_cq(conn->ibc_cq);
 963                 if (rc != 0)
 964                         CWARN("Error destroying CQ: %d\n", rc);
 965         }
 966
 967         if (conn->ibc_rx_pages != NULL)
 968                 kiblnd_unmap_rx_descs(conn);
 969
 970         if (conn->ibc_rxs != NULL) {
 971                 LIBCFS_FREE(conn->ibc_rxs,
 972                             IBLND_RX_MSGS(conn) * sizeof(kib_rx_t));
 973         }
 974
 975         if (conn->ibc_connvars != NULL)
 976                 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
 977
 978         if (conn->ibc_hdev != NULL)
 979                 kiblnd_hdev_decref(conn->ibc_hdev);
 980
 981         /* See CAVEAT EMPTOR above in kiblnd_create_conn */
 982         if (conn->ibc_state != IBLND_CONN_INIT) {
 983                 kib_net_t *net = peer->ibp_ni->ni_data;
 984
 985                 kiblnd_peer_decref(peer);
 986                 rdma_destroy_id(cmid);
 987                 atomic_dec(&net->ibn_nconns);
 988         }
 989
 990         if (free_conn)
 991                 LIBCFS_FREE(conn, sizeof(*conn));
 992 }
 993
 994 int
 995 kiblnd_close_peer_conns_locked(kib_peer_t *peer, int why)
 996 {
 997         kib_conn_t              *conn;
 998         struct list_head        *ctmp;
 999         struct list_head        *cnxt;
1000         int                     count = 0;
1001
1002         list_for_each_safe(ctmp, cnxt, &peer->ibp_conns) {
1003                 conn = list_entry(ctmp, kib_conn_t, ibc_list);
1004
1005                 CDEBUG(D_NET, "Closing conn -> %s, "
1006                               "version: %x, reason: %d\n",
1007                        libcfs_nid2str(peer->ibp_nid),
1008                        conn->ibc_version, why);
1009
1010                 kiblnd_close_conn_locked(conn, why);
1011                 count++;
1012         }
1013
1014         return count;
1015 }
1016
1017 int
1018 kiblnd_close_stale_conns_locked(kib_peer_t *peer,
1019                                 int version, __u64 incarnation)
1020 {
1021         kib_conn_t              *conn;
1022         struct list_head        *ctmp;
1023         struct list_head        *cnxt;
1024         int                     count = 0;
1025
1026         list_for_each_safe(ctmp, cnxt, &peer->ibp_conns) {
1027                 conn = list_entry(ctmp, kib_conn_t, ibc_list);
1028
1029                 if (conn->ibc_version     == version &&
1030                     conn->ibc_incarnation == incarnation)
1031                         continue;
1032
1033                 CDEBUG(D_NET, "Closing stale conn -> %s version: %x, "
1034                               "incarnation:%#llx(%x, %#llx)\n",
1035                        libcfs_nid2str(peer->ibp_nid),
1036                        conn->ibc_version, conn->ibc_incarnation,
1037                        version, incarnation);
1038
1039                 kiblnd_close_conn_locked(conn, -ESTALE);
1040                 count++;
1041         }
1042
1043         return count;
1044 }
1045
1046 static int
1047 kiblnd_close_matching_conns(lnet_ni_t *ni, lnet_nid_t nid)
1048 {
1049         kib_peer_t              *peer;
1050         struct list_head        *ptmp;
1051         struct list_head        *pnxt;
1052         int                     lo;
1053         int                     hi;
1054         int                     i;
1055         unsigned long           flags;
1056         int                     count = 0;
1057
1058         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1059
1060         if (nid != LNET_NID_ANY)
1061                 lo = hi = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
1062         else {
1063                 lo = 0;
1064                 hi = kiblnd_data.kib_peer_hash_size - 1;
1065         }
1066
1067         for (i = lo; i <= hi; i++) {
1068                 list_for_each_safe(ptmp, pnxt, &kiblnd_data.kib_peers[i]) {
1069
1070                         peer = list_entry(ptmp, kib_peer_t, ibp_list);
1071                         LASSERT(!kiblnd_peer_idle(peer));
1072
1073                         if (peer->ibp_ni != ni)
1074                                 continue;
1075
1076                         if (!(nid == LNET_NID_ANY || nid == peer->ibp_nid))
1077                                 continue;
1078
1079                         count += kiblnd_close_peer_conns_locked(peer, 0);
1080                 }
1081         }
1082
1083         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1084
1085         /* wildcards always succeed */
1086         if (nid == LNET_NID_ANY)
1087                 return 0;
1088
1089         return (count == 0) ? -ENOENT : 0;
1090 }
1091
1092 static int
1093 kiblnd_ctl(lnet_ni_t *ni, unsigned int cmd, void *arg)
1094 {
1095         struct libcfs_ioctl_data *data = arg;
1096         int                       rc = -EINVAL;
1097
1098         switch(cmd) {
1099         case IOC_LIBCFS_GET_PEER: {
1100                 lnet_nid_t   nid = 0;
1101                 int          count = 0;
1102
1103                 rc = kiblnd_get_peer_info(ni, data->ioc_count,
1104                                           &nid, &count);
1105                 data->ioc_nid    = nid;
1106                 data->ioc_count  = count;
1107                 break;
1108         }
1109
1110         case IOC_LIBCFS_DEL_PEER: {
1111                 rc = kiblnd_del_peer(ni, data->ioc_nid);
1112                 break;
1113         }
1114         case IOC_LIBCFS_GET_CONN: {
1115                 kib_conn_t *conn;
1116
1117                 rc = 0;
1118                 conn = kiblnd_get_conn_by_idx(ni, data->ioc_count);
1119                 if (conn == NULL) {
1120                         rc = -ENOENT;
1121                         break;
1122                 }
1123
1124                 LASSERT (conn->ibc_cmid != NULL);
1125                 data->ioc_nid = conn->ibc_peer->ibp_nid;
1126                 if (conn->ibc_cmid->route.path_rec == NULL)
1127                         data->ioc_u32[0] = 0; /* iWarp has no path MTU */
1128                 else
1129                         data->ioc_u32[0] =
1130                         ib_mtu_enum_to_int(conn->ibc_cmid->route.path_rec->mtu);
1131                 kiblnd_conn_decref(conn);
1132                 break;
1133         }
1134         case IOC_LIBCFS_CLOSE_CONNECTION: {
1135                 rc = kiblnd_close_matching_conns(ni, data->ioc_nid);
1136                 break;
1137         }
1138
1139         default:
1140                 break;
1141         }
1142
1143         return rc;
1144 }
1145
1146 static void
1147 kiblnd_query(lnet_ni_t *ni, lnet_nid_t nid, cfs_time_t *when)
1148 {
1149         cfs_time_t      last_alive = 0;
1150         cfs_time_t      now = cfs_time_current();
1151         rwlock_t        *glock = &kiblnd_data.kib_global_lock;
1152         kib_peer_t      *peer;
1153         unsigned long   flags;
1154
1155         read_lock_irqsave(glock, flags);
1156
1157         peer = kiblnd_find_peer_locked(nid);
1158         if (peer != NULL)
1159                 last_alive = peer->ibp_last_alive;
1160
1161         read_unlock_irqrestore(glock, flags);
1162
1163         if (last_alive != 0)
1164                 *when = last_alive;
1165
1166         /* peer is not persistent in hash, trigger peer creation
1167          * and connection establishment with a NULL tx */
1168         if (peer == NULL)
1169                 kiblnd_launch_tx(ni, NULL, nid);
1170
1171         CDEBUG(D_NET, "Peer %s %p, alive %ld secs ago\n",
1172                libcfs_nid2str(nid), peer,
1173                last_alive ? cfs_duration_sec(now - last_alive) : -1);
1174         return;
1175 }
1176
1177 static void
1178 kiblnd_free_pages(kib_pages_t *p)
1179 {
1180         int     npages = p->ibp_npages;
1181         int     i;
1182
1183         for (i = 0; i < npages; i++) {
1184                 if (p->ibp_pages[i] != NULL)
1185                         __free_page(p->ibp_pages[i]);
1186         }
1187
1188         LIBCFS_FREE(p, offsetof(kib_pages_t, ibp_pages[npages]));
1189 }
1190
1191 int
1192 kiblnd_alloc_pages(kib_pages_t **pp, int cpt, int npages)
1193 {
1194         kib_pages_t     *p;
1195         int             i;
1196
1197         LIBCFS_CPT_ALLOC(p, lnet_cpt_table(), cpt,
1198                          offsetof(kib_pages_t, ibp_pages[npages]));
1199         if (p == NULL) {
1200                 CERROR("Can't allocate descriptor for %d pages\n", npages);
1201                 return -ENOMEM;
1202         }
1203
1204         memset(p, 0, offsetof(kib_pages_t, ibp_pages[npages]));
1205         p->ibp_npages = npages;
1206
1207         for (i = 0; i < npages; i++) {
1208                 p->ibp_pages[i] = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1209                                                      GFP_NOFS);
1210                 if (p->ibp_pages[i] == NULL) {
1211                         CERROR("Can't allocate page %d of %d\n", i, npages);
1212                         kiblnd_free_pages(p);
1213                         return -ENOMEM;
1214                 }
1215         }
1216
1217         *pp = p;
1218         return 0;
1219 }
1220
1221 void
1222 kiblnd_unmap_rx_descs(kib_conn_t *conn)
1223 {
1224         kib_rx_t *rx;
1225         int       i;
1226
1227         LASSERT (conn->ibc_rxs != NULL);
1228         LASSERT (conn->ibc_hdev != NULL);
1229
1230         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
1231                 rx = &conn->ibc_rxs[i];
1232
1233                 LASSERT(rx->rx_nob >= 0); /* not posted */
1234
1235                 kiblnd_dma_unmap_single(conn->ibc_hdev->ibh_ibdev,
1236                                         KIBLND_UNMAP_ADDR(rx, rx_msgunmap,
1237                                                           rx->rx_msgaddr),
1238                                         IBLND_MSG_SIZE, DMA_FROM_DEVICE);
1239         }
1240
1241         kiblnd_free_pages(conn->ibc_rx_pages);
1242
1243         conn->ibc_rx_pages = NULL;
1244 }
1245
1246 void
1247 kiblnd_map_rx_descs(kib_conn_t *conn)
1248 {
1249         kib_rx_t       *rx;
1250         struct page    *pg;
1251         int             pg_off;
1252         int             ipg;
1253         int             i;
1254
1255         for (pg_off = ipg = i = 0; i < IBLND_RX_MSGS(conn); i++) {
1256                 pg = conn->ibc_rx_pages->ibp_pages[ipg];
1257                 rx = &conn->ibc_rxs[i];
1258
1259                 rx->rx_conn = conn;
1260                 rx->rx_msg = (kib_msg_t *)(((char *)page_address(pg)) + pg_off);
1261
1262                 rx->rx_msgaddr =
1263                         kiblnd_dma_map_single(conn->ibc_hdev->ibh_ibdev,
1264                                               rx->rx_msg, IBLND_MSG_SIZE,
1265                                               DMA_FROM_DEVICE);
1266                 LASSERT(!kiblnd_dma_mapping_error(conn->ibc_hdev->ibh_ibdev,
1267                                                   rx->rx_msgaddr));
1268                 KIBLND_UNMAP_ADDR_SET(rx, rx_msgunmap, rx->rx_msgaddr);
1269
1270                 CDEBUG(D_NET, "rx %d: %p %#llx(%#llx)\n",
1271                        i, rx->rx_msg, rx->rx_msgaddr,
1272                        (__u64)(page_to_phys(pg) + pg_off));
1273
1274                 pg_off += IBLND_MSG_SIZE;
1275                 LASSERT(pg_off <= PAGE_SIZE);
1276
1277                 if (pg_off == PAGE_SIZE) {
1278                         pg_off = 0;
1279                         ipg++;
1280                         LASSERT(ipg <= IBLND_RX_MSG_PAGES(conn));
1281                 }
1282         }
1283 }
1284
1285 static void
1286 kiblnd_unmap_tx_pool(kib_tx_pool_t *tpo)
1287 {
1288         kib_hca_dev_t  *hdev = tpo->tpo_hdev;
1289         kib_tx_t       *tx;
1290         int             i;
1291
1292         LASSERT (tpo->tpo_pool.po_allocated == 0);
1293
1294         if (hdev == NULL)
1295                 return;
1296
1297         for (i = 0; i < tpo->tpo_pool.po_size; i++) {
1298                 tx = &tpo->tpo_tx_descs[i];
1299                 kiblnd_dma_unmap_single(hdev->ibh_ibdev,
1300                                         KIBLND_UNMAP_ADDR(tx, tx_msgunmap,
1301                                                           tx->tx_msgaddr),
1302                                         IBLND_MSG_SIZE, DMA_TO_DEVICE);
1303         }
1304
1305         kiblnd_hdev_decref(hdev);
1306         tpo->tpo_hdev = NULL;
1307 }
1308
1309 static kib_hca_dev_t *
1310 kiblnd_current_hdev(kib_dev_t *dev)
1311 {
1312         kib_hca_dev_t *hdev;
1313         unsigned long  flags;
1314         int            i = 0;
1315
1316         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1317         while (dev->ibd_failover) {
1318                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1319                 if (i++ % 50 == 0)
1320                         CDEBUG(D_NET, "%s: Wait for failover\n",
1321                                dev->ibd_ifname);
1322                 set_current_state(TASK_INTERRUPTIBLE);
1323                 schedule_timeout(cfs_time_seconds(1) / 100);
1324
1325                 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1326         }
1327
1328         kiblnd_hdev_addref_locked(dev->ibd_hdev);
1329         hdev = dev->ibd_hdev;
1330
1331         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1332
1333         return hdev;
1334 }
1335
1336 static void
1337 kiblnd_map_tx_pool(kib_tx_pool_t *tpo)
1338 {
1339         kib_pages_t    *txpgs = tpo->tpo_tx_pages;
1340         kib_pool_t     *pool  = &tpo->tpo_pool;
1341         kib_net_t      *net   = pool->po_owner->ps_net;
1342         kib_dev_t      *dev;
1343         struct page    *page;
1344         kib_tx_t       *tx;
1345         int             page_offset;
1346         int             ipage;
1347         int             i;
1348
1349         LASSERT (net != NULL);
1350
1351         dev = net->ibn_dev;
1352
1353         /* pre-mapped messages are not bigger than 1 page */
1354         CLASSERT (IBLND_MSG_SIZE <= PAGE_SIZE);
1355
1356         /* No fancy arithmetic when we do the buffer calculations */
1357         CLASSERT (PAGE_SIZE % IBLND_MSG_SIZE == 0);
1358
1359         tpo->tpo_hdev = kiblnd_current_hdev(dev);
1360
1361         for (ipage = page_offset = i = 0; i < pool->po_size; i++) {
1362                 page = txpgs->ibp_pages[ipage];
1363                 tx = &tpo->tpo_tx_descs[i];
1364
1365                 tx->tx_msg = (kib_msg_t *)(((char *)page_address(page)) +
1366                                            page_offset);
1367
1368                 tx->tx_msgaddr = kiblnd_dma_map_single(tpo->tpo_hdev->ibh_ibdev,
1369                                                        tx->tx_msg,
1370                                                        IBLND_MSG_SIZE,
1371                                                        DMA_TO_DEVICE);
1372                 LASSERT(!kiblnd_dma_mapping_error(tpo->tpo_hdev->ibh_ibdev,
1373                                                   tx->tx_msgaddr));
1374                 KIBLND_UNMAP_ADDR_SET(tx, tx_msgunmap, tx->tx_msgaddr);
1375
1376                 list_add(&tx->tx_list, &pool->po_free_list);
1377
1378                 page_offset += IBLND_MSG_SIZE;
1379                 LASSERT(page_offset <= PAGE_SIZE);
1380
1381                 if (page_offset == PAGE_SIZE) {
1382                         page_offset = 0;
1383                         ipage++;
1384                         LASSERT(ipage <= txpgs->ibp_npages);
1385                 }
1386         }
1387 }
1388
1389 struct ib_mr *
1390 kiblnd_find_rd_dma_mr(struct lnet_ni *ni, kib_rdma_desc_t *rd,
1391                       int negotiated_nfrags)
1392 {
1393         kib_net_t     *net   = ni->ni_data;
1394         kib_hca_dev_t *hdev  = net->ibn_dev->ibd_hdev;
1395         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
1396         int     mod;
1397         __u16   nfrags;
1398
1399         tunables = &ni->ni_lnd_tunables->lt_tun_u.lt_o2ib;
1400         mod = tunables->lnd_map_on_demand;
1401         nfrags = (negotiated_nfrags != -1) ? negotiated_nfrags : mod;
1402
1403         LASSERT(hdev->ibh_mrs != NULL);
1404
1405         if (mod > 0 && nfrags <= rd->rd_nfrags)
1406                 return NULL;
1407
1408         return hdev->ibh_mrs;
1409 }
1410
1411 static void
1412 kiblnd_destroy_fmr_pool(kib_fmr_pool_t *fpo)
1413 {
1414         LASSERT(fpo->fpo_map_count == 0);
1415
1416         if (fpo->fpo_is_fmr) {
1417                 if (fpo->fmr.fpo_fmr_pool)
1418                         ib_destroy_fmr_pool(fpo->fmr.fpo_fmr_pool);
1419         } else {
1420                 struct kib_fast_reg_descriptor *frd, *tmp;
1421                 int i = 0;
1422
1423                 list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1424                                          frd_list) {
1425                         list_del(&frd->frd_list);
1426 #ifndef HAVE_IB_MAP_MR_SG
1427                         ib_free_fast_reg_page_list(frd->frd_frpl);
1428 #endif
1429                         ib_dereg_mr(frd->frd_mr);
1430                         LIBCFS_FREE(frd, sizeof(*frd));
1431                         i++;
1432                 }
1433                 if (i < fpo->fast_reg.fpo_pool_size)
1434                         CERROR("FastReg pool still has %d regions registered\n",
1435                                 fpo->fast_reg.fpo_pool_size - i);
1436         }
1437
1438         if (fpo->fpo_hdev)
1439                 kiblnd_hdev_decref(fpo->fpo_hdev);
1440
1441         LIBCFS_FREE(fpo, sizeof(*fpo));
1442 }
1443
1444 static void
1445 kiblnd_destroy_fmr_pool_list(struct list_head *head)
1446 {
1447         kib_fmr_pool_t *fpo, *tmp;
1448
1449         list_for_each_entry_safe(fpo, tmp, head, fpo_list) {
1450                 list_del(&fpo->fpo_list);
1451                 kiblnd_destroy_fmr_pool(fpo);
1452         }
1453 }
1454
1455 static int
1456 kiblnd_fmr_pool_size(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1457                      int ncpts)
1458 {
1459         int size = tunables->lnd_fmr_pool_size / ncpts;
1460
1461         return max(IBLND_FMR_POOL, size);
1462 }
1463
1464 static int
1465 kiblnd_fmr_flush_trigger(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1466                          int ncpts)
1467 {
1468         int size = tunables->lnd_fmr_flush_trigger / ncpts;
1469
1470         return max(IBLND_FMR_POOL_FLUSH, size);
1471 }
1472
1473 static int kiblnd_alloc_fmr_pool(kib_fmr_poolset_t *fps, kib_fmr_pool_t *fpo)
1474 {
1475         struct ib_fmr_pool_param param = {
1476                 .max_pages_per_fmr = LNET_MAX_PAYLOAD/PAGE_SIZE,
1477                 .page_shift        = PAGE_SHIFT,
1478                 .access            = (IB_ACCESS_LOCAL_WRITE |
1479                                       IB_ACCESS_REMOTE_WRITE),
1480                 .pool_size         = fps->fps_pool_size,
1481                 .dirty_watermark   = fps->fps_flush_trigger,
1482                 .flush_function    = NULL,
1483                 .flush_arg         = NULL,
1484                 .cache             = !!fps->fps_cache };
1485         int rc = 0;
1486
1487         fpo->fmr.fpo_fmr_pool = ib_create_fmr_pool(fpo->fpo_hdev->ibh_pd,
1488                                                    &param);
1489         if (IS_ERR(fpo->fmr.fpo_fmr_pool)) {
1490                 rc = PTR_ERR(fpo->fmr.fpo_fmr_pool);
1491                 if (rc != -ENOSYS)
1492                         CERROR("Failed to create FMR pool: %d\n", rc);
1493                 else
1494                         CERROR("FMRs are not supported\n");
1495         }
1496
1497         return rc;
1498 }
1499
1500 static int kiblnd_alloc_freg_pool(kib_fmr_poolset_t *fps, kib_fmr_pool_t *fpo)
1501 {
1502         struct kib_fast_reg_descriptor *frd, *tmp;
1503         int i, rc;
1504
1505         INIT_LIST_HEAD(&fpo->fast_reg.fpo_pool_list);
1506         fpo->fast_reg.fpo_pool_size = 0;
1507         for (i = 0; i < fps->fps_pool_size; i++) {
1508                 LIBCFS_CPT_ALLOC(frd, lnet_cpt_table(), fps->fps_cpt,
1509                                  sizeof(*frd));
1510                 if (!frd) {
1511                         CERROR("Failed to allocate a new fast_reg descriptor\n");
1512                         rc = -ENOMEM;
1513                         goto out;
1514                 }
1515                 frd->frd_mr = NULL;
1516
1517 #ifndef HAVE_IB_MAP_MR_SG
1518                 frd->frd_frpl = ib_alloc_fast_reg_page_list(fpo->fpo_hdev->ibh_ibdev,
1519                                                             LNET_MAX_PAYLOAD/PAGE_SIZE);
1520                 if (IS_ERR(frd->frd_frpl)) {
1521                         rc = PTR_ERR(frd->frd_frpl);
1522                         CERROR("Failed to allocate ib_fast_reg_page_list: %d\n",
1523                                 rc);
1524                         frd->frd_frpl = NULL;
1525                         goto out_middle;
1526                 }
1527 #endif
1528
1529 #ifdef HAVE_IB_ALLOC_FAST_REG_MR
1530                 frd->frd_mr = ib_alloc_fast_reg_mr(fpo->fpo_hdev->ibh_pd,
1531                                                    LNET_MAX_PAYLOAD/PAGE_SIZE);
1532 #else
1533                 frd->frd_mr = ib_alloc_mr(fpo->fpo_hdev->ibh_pd,
1534                                           IB_MR_TYPE_MEM_REG,
1535                                           LNET_MAX_PAYLOAD/PAGE_SIZE);
1536 #endif
1537                 if (IS_ERR(frd->frd_mr)) {
1538                         rc = PTR_ERR(frd->frd_mr);
1539                         CERROR("Failed to allocate ib_fast_reg_mr: %d\n", rc);
1540                         frd->frd_mr = NULL;
1541                         goto out_middle;
1542                 }
1543
1544                 frd->frd_valid = true;
1545
1546                 list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1547                 fpo->fast_reg.fpo_pool_size++;
1548         }
1549
1550         return 0;
1551
1552 out_middle:
1553         if (frd->frd_mr)
1554                 ib_dereg_mr(frd->frd_mr);
1555 #ifndef HAVE_IB_MAP_MR_SG
1556         if (frd->frd_frpl)
1557                 ib_free_fast_reg_page_list(frd->frd_frpl);
1558 #endif
1559         LIBCFS_FREE(frd, sizeof(*frd));
1560
1561 out:
1562         list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1563                                  frd_list) {
1564                 list_del(&frd->frd_list);
1565 #ifndef HAVE_IB_MAP_MR_SG
1566                 ib_free_fast_reg_page_list(frd->frd_frpl);
1567 #endif
1568                 ib_dereg_mr(frd->frd_mr);
1569                 LIBCFS_FREE(frd, sizeof(*frd));
1570         }
1571
1572         return rc;
1573 }
1574
1575 static int
1576 kiblnd_create_fmr_pool(kib_fmr_poolset_t *fps, kib_fmr_pool_t **pp_fpo)
1577 {
1578         struct ib_device_attr *dev_attr;
1579         kib_dev_t *dev = fps->fps_net->ibn_dev;
1580         kib_fmr_pool_t *fpo;
1581         int rc;
1582
1583 #ifndef HAVE_IB_DEVICE_ATTRS
1584         dev_attr = kmalloc(sizeof(*dev_attr), GFP_KERNEL);
1585         if (!dev_attr)
1586                 return -ENOMEM;
1587 #endif
1588
1589         LIBCFS_CPT_ALLOC(fpo, lnet_cpt_table(), fps->fps_cpt, sizeof(*fpo));
1590         if (!fpo) {
1591                 rc = -ENOMEM;
1592                 goto out_dev_attr;
1593         }
1594
1595         fpo->fpo_hdev = kiblnd_current_hdev(dev);
1596
1597 #ifdef HAVE_IB_DEVICE_ATTRS
1598         dev_attr = &fpo->fpo_hdev->ibh_ibdev->attrs;
1599 #else
1600         rc = ib_query_device(fpo->fpo_hdev->ibh_ibdev, dev_attr);
1601         if (rc) {
1602                 CERROR("Query device failed for %s: %d\n",
1603                         fpo->fpo_hdev->ibh_ibdev->name, rc);
1604                 goto out_dev_attr;
1605         }
1606 #endif
1607
1608         /* Check for FMR or FastReg support */
1609         fpo->fpo_is_fmr = 0;
1610         if (fpo->fpo_hdev->ibh_ibdev->alloc_fmr &&
1611             fpo->fpo_hdev->ibh_ibdev->dealloc_fmr &&
1612             fpo->fpo_hdev->ibh_ibdev->map_phys_fmr &&
1613             fpo->fpo_hdev->ibh_ibdev->unmap_fmr) {
1614                 LCONSOLE_INFO("Using FMR for registration\n");
1615                 fpo->fpo_is_fmr = 1;
1616         } else if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
1617                 LCONSOLE_INFO("Using FastReg for registration\n");
1618         } else {
1619                 rc = -ENOSYS;
1620                 LCONSOLE_ERROR_MSG(rc, "IB device does not support FMRs nor FastRegs, can't register memory\n");
1621                 goto out_dev_attr;
1622         }
1623
1624         if (fpo->fpo_is_fmr)
1625                 rc = kiblnd_alloc_fmr_pool(fps, fpo);
1626         else
1627                 rc = kiblnd_alloc_freg_pool(fps, fpo);
1628         if (rc)
1629                 goto out_fpo;
1630
1631 #ifndef HAVE_IB_DEVICE_ATTRS
1632         kfree(dev_attr);
1633 #endif
1634         fpo->fpo_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1635         fpo->fpo_owner    = fps;
1636         *pp_fpo = fpo;
1637
1638         return 0;
1639
1640 out_fpo:
1641         kiblnd_hdev_decref(fpo->fpo_hdev);
1642         LIBCFS_FREE(fpo, sizeof(*fpo));
1643
1644 out_dev_attr:
1645 #ifndef HAVE_IB_DEVICE_ATTRS
1646         kfree(dev_attr);
1647 #endif
1648
1649         return rc;
1650 }
1651
1652 static void
1653 kiblnd_fail_fmr_poolset(kib_fmr_poolset_t *fps, struct list_head *zombies)
1654 {
1655         if (fps->fps_net == NULL) /* intialized? */
1656                 return;
1657
1658         spin_lock(&fps->fps_lock);
1659
1660         while (!list_empty(&fps->fps_pool_list)) {
1661                 kib_fmr_pool_t *fpo = list_entry(fps->fps_pool_list.next,
1662                                                  kib_fmr_pool_t, fpo_list);
1663                 fpo->fpo_failed = 1;
1664                 list_del(&fpo->fpo_list);
1665                 if (fpo->fpo_map_count == 0)
1666                         list_add(&fpo->fpo_list, zombies);
1667                 else
1668                         list_add(&fpo->fpo_list, &fps->fps_failed_pool_list);
1669         }
1670
1671         spin_unlock(&fps->fps_lock);
1672 }
1673
1674 static void
1675 kiblnd_fini_fmr_poolset(kib_fmr_poolset_t *fps)
1676 {
1677         if (fps->fps_net != NULL) { /* initialized? */
1678                 kiblnd_destroy_fmr_pool_list(&fps->fps_failed_pool_list);
1679                 kiblnd_destroy_fmr_pool_list(&fps->fps_pool_list);
1680         }
1681 }
1682
1683 static int
1684 kiblnd_init_fmr_poolset(kib_fmr_poolset_t *fps, int cpt, int ncpts,
1685                         kib_net_t *net,
1686                         struct lnet_ioctl_config_o2iblnd_tunables *tunables)
1687 {
1688         kib_fmr_pool_t *fpo;
1689         int             rc;
1690
1691         memset(fps, 0, sizeof(kib_fmr_poolset_t));
1692
1693         fps->fps_net = net;
1694         fps->fps_cpt = cpt;
1695
1696         fps->fps_pool_size = kiblnd_fmr_pool_size(tunables, ncpts);
1697         fps->fps_flush_trigger = kiblnd_fmr_flush_trigger(tunables, ncpts);
1698         fps->fps_cache = tunables->lnd_fmr_cache;
1699
1700         spin_lock_init(&fps->fps_lock);
1701         INIT_LIST_HEAD(&fps->fps_pool_list);
1702         INIT_LIST_HEAD(&fps->fps_failed_pool_list);
1703
1704         rc = kiblnd_create_fmr_pool(fps, &fpo);
1705         if (rc == 0)
1706                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1707
1708         return rc;
1709 }
1710
1711 static int
1712 kiblnd_fmr_pool_is_idle(kib_fmr_pool_t *fpo, cfs_time_t now)
1713 {
1714         if (fpo->fpo_map_count != 0) /* still in use */
1715                 return 0;
1716         if (fpo->fpo_failed)
1717                 return 1;
1718         return cfs_time_aftereq(now, fpo->fpo_deadline);
1719 }
1720
1721 static int
1722 kiblnd_map_tx_pages(kib_tx_t *tx, kib_rdma_desc_t *rd)
1723 {
1724         kib_hca_dev_t   *hdev;
1725         __u64           *pages = tx->tx_pages;
1726         int             npages;
1727         int             size;
1728         int             i;
1729
1730         hdev = tx->tx_pool->tpo_hdev;
1731
1732         for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
1733                 for (size = 0; size <  rd->rd_frags[i].rf_nob;
1734                         size += hdev->ibh_page_size) {
1735                         pages[npages++] = (rd->rd_frags[i].rf_addr &
1736                                            hdev->ibh_page_mask) + size;
1737                 }
1738         }
1739
1740         return npages;
1741 }
1742
1743 void
1744 kiblnd_fmr_pool_unmap(kib_fmr_t *fmr, int status)
1745 {
1746         struct list_head   zombies = LIST_HEAD_INIT(zombies);
1747         kib_fmr_pool_t    *fpo = fmr->fmr_pool;
1748         kib_fmr_poolset_t *fps;
1749         cfs_time_t         now = cfs_time_current();
1750         kib_fmr_pool_t    *tmp;
1751         int                rc;
1752
1753         if (!fpo)
1754                 return;
1755
1756         fps = fpo->fpo_owner;
1757         if (fpo->fpo_is_fmr) {
1758                 if (fmr->fmr_pfmr) {
1759                         rc = ib_fmr_pool_unmap(fmr->fmr_pfmr);
1760                         LASSERT(!rc);
1761                         fmr->fmr_pfmr = NULL;
1762                 }
1763
1764                 if (status) {
1765                         rc = ib_flush_fmr_pool(fpo->fmr.fpo_fmr_pool);
1766                         LASSERT(!rc);
1767                 }
1768         } else {
1769                 struct kib_fast_reg_descriptor *frd = fmr->fmr_frd;
1770
1771                 if (frd) {
1772                         frd->frd_valid = false;
1773                         spin_lock(&fps->fps_lock);
1774                         list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1775                         spin_unlock(&fps->fps_lock);
1776                         fmr->fmr_frd = NULL;
1777                 }
1778         }
1779         fmr->fmr_pool = NULL;
1780
1781         spin_lock(&fps->fps_lock);
1782         fpo->fpo_map_count--;   /* decref the pool */
1783
1784         list_for_each_entry_safe(fpo, tmp, &fps->fps_pool_list, fpo_list) {
1785                 /* the first pool is persistent */
1786                 if (fps->fps_pool_list.next == &fpo->fpo_list)
1787                         continue;
1788
1789                 if (kiblnd_fmr_pool_is_idle(fpo, now)) {
1790                         list_move(&fpo->fpo_list, &zombies);
1791                         fps->fps_version++;
1792                 }
1793         }
1794         spin_unlock(&fps->fps_lock);
1795
1796         if (!list_empty(&zombies))
1797                 kiblnd_destroy_fmr_pool_list(&zombies);
1798 }
1799
1800 int
1801 kiblnd_fmr_pool_map(kib_fmr_poolset_t *fps, kib_tx_t *tx, kib_rdma_desc_t *rd,
1802                     __u32 nob, __u64 iov, kib_fmr_t *fmr)
1803 {
1804         kib_fmr_pool_t *fpo;
1805         __u64 *pages = tx->tx_pages;
1806         __u64 version;
1807         bool is_rx = (rd != tx->tx_rd);
1808         bool tx_pages_mapped = 0;
1809         int npages = 0;
1810         int rc;
1811
1812 again:
1813         spin_lock(&fps->fps_lock);
1814         version = fps->fps_version;
1815         list_for_each_entry(fpo, &fps->fps_pool_list, fpo_list) {
1816                 fpo->fpo_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1817                 fpo->fpo_map_count++;
1818
1819                 if (fpo->fpo_is_fmr) {
1820                         struct ib_pool_fmr *pfmr;
1821
1822                         spin_unlock(&fps->fps_lock);
1823
1824                         if (!tx_pages_mapped) {
1825                                 npages = kiblnd_map_tx_pages(tx, rd);
1826                                 tx_pages_mapped = 1;
1827                         }
1828
1829                         pfmr = ib_fmr_pool_map_phys(fpo->fmr.fpo_fmr_pool,
1830                                                     pages, npages, iov);
1831                         if (likely(!IS_ERR(pfmr))) {
1832                                 fmr->fmr_key  = is_rx ? pfmr->fmr->rkey
1833                                                       : pfmr->fmr->lkey;
1834                                 fmr->fmr_frd  = NULL;
1835                                 fmr->fmr_pfmr = pfmr;
1836                                 fmr->fmr_pool = fpo;
1837                                 return 0;
1838                         }
1839                         rc = PTR_ERR(pfmr);
1840                 } else {
1841                         if (!list_empty(&fpo->fast_reg.fpo_pool_list)) {
1842                                 struct kib_fast_reg_descriptor *frd;
1843 #ifdef HAVE_IB_MAP_MR_SG
1844                                 struct ib_reg_wr *wr;
1845                                 int n;
1846 #else
1847                                 struct ib_rdma_wr *wr;
1848                                 struct ib_fast_reg_page_list *frpl;
1849 #endif
1850                                 struct ib_mr *mr;
1851
1852                                 frd = list_first_entry(&fpo->fast_reg.fpo_pool_list,
1853                                                         struct kib_fast_reg_descriptor,
1854                                                         frd_list);
1855                                 list_del(&frd->frd_list);
1856                                 spin_unlock(&fps->fps_lock);
1857
1858 #ifndef HAVE_IB_MAP_MR_SG
1859                                 frpl = frd->frd_frpl;
1860 #endif
1861                                 mr   = frd->frd_mr;
1862
1863                                 if (!frd->frd_valid) {
1864                                         struct ib_rdma_wr *inv_wr;
1865                                         __u32 key = is_rx ? mr->rkey : mr->lkey;
1866
1867                                         inv_wr = &frd->frd_inv_wr;
1868                                         memset(inv_wr, 0, sizeof(*inv_wr));
1869
1870                                         inv_wr->wr.opcode = IB_WR_LOCAL_INV;
1871                                         inv_wr->wr.wr_id  = IBLND_WID_MR;
1872                                         inv_wr->wr.ex.invalidate_rkey = key;
1873
1874                                         /* Bump the key */
1875                                         key = ib_inc_rkey(key);
1876                                         ib_update_fast_reg_key(mr, key);
1877                                 }
1878
1879 #ifdef HAVE_IB_MAP_MR_SG
1880 #ifdef HAVE_IB_MAP_MR_SG_5ARGS
1881                                 n = ib_map_mr_sg(mr, tx->tx_frags,
1882                                                  tx->tx_nfrags, NULL, PAGE_SIZE);
1883 #else
1884                                 n = ib_map_mr_sg(mr, tx->tx_frags,
1885                                                  tx->tx_nfrags, PAGE_SIZE);
1886 #endif
1887                                 if (unlikely(n != tx->tx_nfrags)) {
1888                                         CERROR("Failed to map mr %d/%d "
1889                                                "elements\n", n, tx->tx_nfrags);
1890                                         return n < 0 ? n : -EINVAL;
1891                                 }
1892
1893                                 mr->iova = iov;
1894
1895                                 wr = &frd->frd_fastreg_wr;
1896                                 memset(wr, 0, sizeof(*wr));
1897
1898                                 wr->wr.opcode = IB_WR_REG_MR;
1899                                 wr->wr.wr_id  = IBLND_WID_MR;
1900                                 wr->wr.num_sge = 0;
1901                                 wr->wr.send_flags = 0;
1902                                 wr->mr = mr;
1903                                 wr->key = is_rx ? mr->rkey : mr->lkey;
1904                                 wr->access = (IB_ACCESS_LOCAL_WRITE |
1905                                               IB_ACCESS_REMOTE_WRITE);
1906 #else
1907                                 if (!tx_pages_mapped) {
1908                                         npages = kiblnd_map_tx_pages(tx, rd);
1909                                         tx_pages_mapped = 1;
1910                                 }
1911
1912                                 LASSERT(npages <= frpl->max_page_list_len);
1913                                 memcpy(frpl->page_list, pages,
1914                                         sizeof(*pages) * npages);
1915
1916                                 /* Prepare FastReg WR */
1917                                 wr = &frd->frd_fastreg_wr;
1918                                 memset(wr, 0, sizeof(*wr));
1919
1920                                 wr->wr.opcode = IB_WR_FAST_REG_MR;
1921                                 wr->wr.wr_id  = IBLND_WID_MR;
1922
1923                                 wr->wr.wr.fast_reg.iova_start = iov;
1924                                 wr->wr.wr.fast_reg.page_list  = frpl;
1925                                 wr->wr.wr.fast_reg.page_list_len = npages;
1926                                 wr->wr.wr.fast_reg.page_shift = PAGE_SHIFT;
1927                                 wr->wr.wr.fast_reg.length = nob;
1928                                 wr->wr.wr.fast_reg.rkey =
1929                                                 is_rx ? mr->rkey : mr->lkey;
1930                                 wr->wr.wr.fast_reg.access_flags =
1931                                                 (IB_ACCESS_LOCAL_WRITE |
1932                                                  IB_ACCESS_REMOTE_WRITE);
1933 #endif
1934
1935                                 fmr->fmr_key  = is_rx ? mr->rkey : mr->lkey;
1936                                 fmr->fmr_frd  = frd;
1937                                 fmr->fmr_pfmr = NULL;
1938                                 fmr->fmr_pool = fpo;
1939                                 return 0;
1940                         }
1941                         spin_unlock(&fps->fps_lock);
1942                         rc = -EBUSY;
1943                 }
1944
1945                 spin_lock(&fps->fps_lock);
1946                 fpo->fpo_map_count--;
1947                 if (rc != -EAGAIN) {
1948                         spin_unlock(&fps->fps_lock);
1949                         return rc;
1950                 }
1951
1952                 /* EAGAIN and ... */
1953                 if (version != fps->fps_version) {
1954                         spin_unlock(&fps->fps_lock);
1955                         goto again;
1956                 }
1957         }
1958
1959         if (fps->fps_increasing) {
1960                 spin_unlock(&fps->fps_lock);
1961                 CDEBUG(D_NET, "Another thread is allocating new "
1962                        "FMR pool, waiting for her to complete\n");
1963                 schedule();
1964                 goto again;
1965
1966         }
1967
1968         if (cfs_time_before(cfs_time_current(), fps->fps_next_retry)) {
1969                 /* someone failed recently */
1970                 spin_unlock(&fps->fps_lock);
1971                 return -EAGAIN;
1972         }
1973
1974         fps->fps_increasing = 1;
1975         spin_unlock(&fps->fps_lock);
1976
1977         CDEBUG(D_NET, "Allocate new FMR pool\n");
1978         rc = kiblnd_create_fmr_pool(fps, &fpo);
1979         spin_lock(&fps->fps_lock);
1980         fps->fps_increasing = 0;
1981         if (rc == 0) {
1982                 fps->fps_version++;
1983                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1984         } else {
1985                 fps->fps_next_retry = cfs_time_shift(IBLND_POOL_RETRY);
1986         }
1987         spin_unlock(&fps->fps_lock);
1988
1989         goto again;
1990 }
1991
1992 static void
1993 kiblnd_fini_pool(kib_pool_t *pool)
1994 {
1995         LASSERT(list_empty(&pool->po_free_list));
1996         LASSERT(pool->po_allocated == 0);
1997
1998         CDEBUG(D_NET, "Finalize %s pool\n", pool->po_owner->ps_name);
1999 }
2000
2001 static void
2002 kiblnd_init_pool(kib_poolset_t *ps, kib_pool_t *pool, int size)
2003 {
2004         CDEBUG(D_NET, "Initialize %s pool\n", ps->ps_name);
2005
2006         memset(pool, 0, sizeof(kib_pool_t));
2007         INIT_LIST_HEAD(&pool->po_free_list);
2008         pool->po_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
2009         pool->po_owner    = ps;
2010         pool->po_size     = size;
2011 }
2012
2013 static void
2014 kiblnd_destroy_pool_list(struct list_head *head)
2015 {
2016         kib_pool_t *pool;
2017
2018         while (!list_empty(head)) {
2019                 pool = list_entry(head->next, kib_pool_t, po_list);
2020                 list_del(&pool->po_list);
2021
2022                 LASSERT(pool->po_owner != NULL);
2023                 pool->po_owner->ps_pool_destroy(pool);
2024         }
2025 }
2026
2027 static void
2028 kiblnd_fail_poolset(kib_poolset_t *ps, struct list_head *zombies)
2029 {
2030         if (ps->ps_net == NULL) /* intialized? */
2031                 return;
2032
2033         spin_lock(&ps->ps_lock);
2034         while (!list_empty(&ps->ps_pool_list)) {
2035                 kib_pool_t *po = list_entry(ps->ps_pool_list.next,
2036                                             kib_pool_t, po_list);
2037                 po->po_failed = 1;
2038                 list_del(&po->po_list);
2039                 if (po->po_allocated == 0)
2040                         list_add(&po->po_list, zombies);
2041                 else
2042                         list_add(&po->po_list, &ps->ps_failed_pool_list);
2043         }
2044         spin_unlock(&ps->ps_lock);
2045 }
2046
2047 static void
2048 kiblnd_fini_poolset(kib_poolset_t *ps)
2049 {
2050         if (ps->ps_net != NULL) { /* initialized? */
2051                 kiblnd_destroy_pool_list(&ps->ps_failed_pool_list);
2052                 kiblnd_destroy_pool_list(&ps->ps_pool_list);
2053         }
2054 }
2055
2056 static int
2057 kiblnd_init_poolset(kib_poolset_t *ps, int cpt,
2058                     kib_net_t *net, char *name, int size,
2059                     kib_ps_pool_create_t po_create,
2060                     kib_ps_pool_destroy_t po_destroy,
2061                     kib_ps_node_init_t nd_init,
2062                     kib_ps_node_fini_t nd_fini)
2063 {
2064         kib_pool_t      *pool;
2065         int             rc;
2066
2067         memset(ps, 0, sizeof(kib_poolset_t));
2068
2069         ps->ps_cpt          = cpt;
2070         ps->ps_net          = net;
2071         ps->ps_pool_create  = po_create;
2072         ps->ps_pool_destroy = po_destroy;
2073         ps->ps_node_init    = nd_init;
2074         ps->ps_node_fini    = nd_fini;
2075         ps->ps_pool_size    = size;
2076         if (strlcpy(ps->ps_name, name, sizeof(ps->ps_name))
2077             >= sizeof(ps->ps_name))
2078                 return -E2BIG;
2079         spin_lock_init(&ps->ps_lock);
2080         INIT_LIST_HEAD(&ps->ps_pool_list);
2081         INIT_LIST_HEAD(&ps->ps_failed_pool_list);
2082
2083         rc = ps->ps_pool_create(ps, size, &pool);
2084         if (rc == 0)
2085                 list_add(&pool->po_list, &ps->ps_pool_list);
2086         else
2087                 CERROR("Failed to create the first pool for %s\n", ps->ps_name);
2088
2089         return rc;
2090 }
2091
2092 static int
2093 kiblnd_pool_is_idle(kib_pool_t *pool, cfs_time_t now)
2094 {
2095         if (pool->po_allocated != 0) /* still in use */
2096                 return 0;
2097         if (pool->po_failed)
2098                 return 1;
2099         return cfs_time_aftereq(now, pool->po_deadline);
2100 }
2101
2102 void
2103 kiblnd_pool_free_node(kib_pool_t *pool, struct list_head *node)
2104 {
2105         struct list_head zombies = LIST_HEAD_INIT(zombies);
2106         kib_poolset_t   *ps = pool->po_owner;
2107         kib_pool_t      *tmp;
2108         cfs_time_t       now = cfs_time_current();
2109
2110         spin_lock(&ps->ps_lock);
2111
2112         if (ps->ps_node_fini != NULL)
2113                 ps->ps_node_fini(pool, node);
2114
2115         LASSERT(pool->po_allocated > 0);
2116         list_add(node, &pool->po_free_list);
2117         pool->po_allocated--;
2118
2119         list_for_each_entry_safe(pool, tmp, &ps->ps_pool_list, po_list) {
2120                 /* the first pool is persistent */
2121                 if (ps->ps_pool_list.next == &pool->po_list)
2122                         continue;
2123
2124                 if (kiblnd_pool_is_idle(pool, now))
2125                         list_move(&pool->po_list, &zombies);
2126         }
2127         spin_unlock(&ps->ps_lock);
2128
2129         if (!list_empty(&zombies))
2130                 kiblnd_destroy_pool_list(&zombies);
2131 }
2132
2133 struct list_head *
2134 kiblnd_pool_alloc_node(kib_poolset_t *ps)
2135 {
2136         struct list_head        *node;
2137         kib_pool_t              *pool;
2138         int                     rc;
2139         unsigned int            interval = 1;
2140         cfs_time_t              time_before;
2141         unsigned int            trips = 0;
2142
2143 again:
2144         spin_lock(&ps->ps_lock);
2145         list_for_each_entry(pool, &ps->ps_pool_list, po_list) {
2146                 if (list_empty(&pool->po_free_list))
2147                         continue;
2148
2149                 pool->po_allocated++;
2150                 pool->po_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
2151                 node = pool->po_free_list.next;
2152                 list_del(node);
2153
2154                 if (ps->ps_node_init != NULL) {
2155                         /* still hold the lock */
2156                         ps->ps_node_init(pool, node);
2157                 }
2158                 spin_unlock(&ps->ps_lock);
2159                 return node;
2160         }
2161
2162         /* no available tx pool and ... */
2163         if (ps->ps_increasing) {
2164                 /* another thread is allocating a new pool */
2165                 spin_unlock(&ps->ps_lock);
2166                 trips++;
2167                 CDEBUG(D_NET, "Another thread is allocating new "
2168                        "%s pool, waiting %d HZs for her to complete."
2169                        "trips = %d\n",
2170                        ps->ps_name, interval, trips);
2171
2172                 set_current_state(TASK_INTERRUPTIBLE);
2173                 schedule_timeout(interval);
2174                 if (interval < cfs_time_seconds(1))
2175                         interval *= 2;
2176
2177                 goto again;
2178         }
2179
2180         if (cfs_time_before(cfs_time_current(), ps->ps_next_retry)) {
2181                 /* someone failed recently */
2182                 spin_unlock(&ps->ps_lock);
2183                 return NULL;
2184         }
2185
2186         ps->ps_increasing = 1;
2187         spin_unlock(&ps->ps_lock);
2188
2189         CDEBUG(D_NET, "%s pool exhausted, allocate new pool\n", ps->ps_name);
2190         time_before = cfs_time_current();
2191         rc = ps->ps_pool_create(ps, ps->ps_pool_size, &pool);
2192         CDEBUG(D_NET, "ps_pool_create took %lu HZ to complete",
2193                cfs_time_current() - time_before);
2194
2195         spin_lock(&ps->ps_lock);
2196         ps->ps_increasing = 0;
2197         if (rc == 0) {
2198                 list_add_tail(&pool->po_list, &ps->ps_pool_list);
2199         } else {
2200                 ps->ps_next_retry = cfs_time_shift(IBLND_POOL_RETRY);
2201                 CERROR("Can't allocate new %s pool because out of memory\n",
2202                        ps->ps_name);
2203         }
2204         spin_unlock(&ps->ps_lock);
2205
2206         goto again;
2207 }
2208
2209 static void
2210 kiblnd_destroy_tx_pool(kib_pool_t *pool)
2211 {
2212         kib_tx_pool_t  *tpo = container_of(pool, kib_tx_pool_t, tpo_pool);
2213         int             i;
2214
2215         LASSERT (pool->po_allocated == 0);
2216
2217         if (tpo->tpo_tx_pages != NULL) {
2218                 kiblnd_unmap_tx_pool(tpo);
2219                 kiblnd_free_pages(tpo->tpo_tx_pages);
2220         }
2221
2222         if (tpo->tpo_tx_descs == NULL)
2223                 goto out;
2224
2225         for (i = 0; i < pool->po_size; i++) {
2226                 kib_tx_t *tx = &tpo->tpo_tx_descs[i];
2227
2228                 list_del(&tx->tx_list);
2229                 if (tx->tx_pages != NULL)
2230                         LIBCFS_FREE(tx->tx_pages,
2231                                     LNET_MAX_IOV *
2232                                     sizeof(*tx->tx_pages));
2233                 if (tx->tx_frags != NULL)
2234                         LIBCFS_FREE(tx->tx_frags,
2235                                     (1 + IBLND_MAX_RDMA_FRAGS) *
2236                                     sizeof(*tx->tx_frags));
2237                 if (tx->tx_wrq != NULL)
2238                         LIBCFS_FREE(tx->tx_wrq,
2239                                     (1 + IBLND_MAX_RDMA_FRAGS) *
2240                                     sizeof(*tx->tx_wrq));
2241                 if (tx->tx_sge != NULL)
2242                         LIBCFS_FREE(tx->tx_sge,
2243                                     (1 + IBLND_MAX_RDMA_FRAGS) *
2244                                     sizeof(*tx->tx_sge));
2245                 if (tx->tx_rd != NULL)
2246                         LIBCFS_FREE(tx->tx_rd,
2247                                     offsetof(kib_rdma_desc_t,
2248                                              rd_frags[IBLND_MAX_RDMA_FRAGS]));
2249         }
2250
2251         LIBCFS_FREE(tpo->tpo_tx_descs,
2252                     pool->po_size * sizeof(kib_tx_t));
2253 out:
2254         kiblnd_fini_pool(pool);
2255         LIBCFS_FREE(tpo, sizeof(kib_tx_pool_t));
2256 }
2257
2258 static int kiblnd_tx_pool_size(int ncpts)
2259 {
2260         int ntx = *kiblnd_tunables.kib_ntx / ncpts;
2261
2262         return max(IBLND_TX_POOL, ntx);
2263 }
2264
2265 static int
2266 kiblnd_create_tx_pool(kib_poolset_t *ps, int size, kib_pool_t **pp_po)
2267 {
2268         int            i;
2269         int            npg;
2270         kib_pool_t    *pool;
2271         kib_tx_pool_t *tpo;
2272
2273         LIBCFS_CPT_ALLOC(tpo, lnet_cpt_table(), ps->ps_cpt, sizeof(*tpo));
2274         if (tpo == NULL) {
2275                 CERROR("Failed to allocate TX pool\n");
2276                 return -ENOMEM;
2277         }
2278
2279         pool = &tpo->tpo_pool;
2280         kiblnd_init_pool(ps, pool, size);
2281         tpo->tpo_tx_descs = NULL;
2282         tpo->tpo_tx_pages = NULL;
2283
2284         npg = (size * IBLND_MSG_SIZE + PAGE_SIZE - 1) / PAGE_SIZE;
2285         if (kiblnd_alloc_pages(&tpo->tpo_tx_pages, ps->ps_cpt, npg) != 0) {
2286                 CERROR("Can't allocate tx pages: %d\n", npg);
2287                 LIBCFS_FREE(tpo, sizeof(kib_tx_pool_t));
2288                 return -ENOMEM;
2289         }
2290
2291         LIBCFS_CPT_ALLOC(tpo->tpo_tx_descs, lnet_cpt_table(), ps->ps_cpt,
2292                          size * sizeof(kib_tx_t));
2293         if (tpo->tpo_tx_descs == NULL) {
2294                 CERROR("Can't allocate %d tx descriptors\n", size);
2295                 ps->ps_pool_destroy(pool);
2296                 return -ENOMEM;
2297         }
2298
2299         memset(tpo->tpo_tx_descs, 0, size * sizeof(kib_tx_t));
2300
2301         for (i = 0; i < size; i++) {
2302                 kib_tx_t *tx = &tpo->tpo_tx_descs[i];
2303
2304                 tx->tx_pool = tpo;
2305                 if (ps->ps_net->ibn_fmr_ps != NULL) {
2306                         LIBCFS_CPT_ALLOC(tx->tx_pages,
2307                                          lnet_cpt_table(), ps->ps_cpt,
2308                                          LNET_MAX_IOV * sizeof(*tx->tx_pages));
2309                         if (tx->tx_pages == NULL)
2310                                 break;
2311                 }
2312
2313                 LIBCFS_CPT_ALLOC(tx->tx_frags, lnet_cpt_table(), ps->ps_cpt,
2314                                  (1 + IBLND_MAX_RDMA_FRAGS) *
2315                                  sizeof(*tx->tx_frags));
2316                 if (tx->tx_frags == NULL)
2317                         break;
2318
2319                 sg_init_table(tx->tx_frags, IBLND_MAX_RDMA_FRAGS + 1);
2320
2321                 LIBCFS_CPT_ALLOC(tx->tx_wrq, lnet_cpt_table(), ps->ps_cpt,
2322                                  (1 + IBLND_MAX_RDMA_FRAGS) *
2323                                  sizeof(*tx->tx_wrq));
2324                 if (tx->tx_wrq == NULL)
2325                         break;
2326
2327                 LIBCFS_CPT_ALLOC(tx->tx_sge, lnet_cpt_table(), ps->ps_cpt,
2328                                  (1 + IBLND_MAX_RDMA_FRAGS) *
2329                                  sizeof(*tx->tx_sge));
2330                 if (tx->tx_sge == NULL)
2331                         break;
2332
2333                 LIBCFS_CPT_ALLOC(tx->tx_rd, lnet_cpt_table(), ps->ps_cpt,
2334                                  offsetof(kib_rdma_desc_t,
2335                                           rd_frags[IBLND_MAX_RDMA_FRAGS]));
2336                 if (tx->tx_rd == NULL)
2337                         break;
2338         }
2339
2340         if (i == size) {
2341                 kiblnd_map_tx_pool(tpo);
2342                 *pp_po = pool;
2343                 return 0;
2344         }
2345
2346         ps->ps_pool_destroy(pool);
2347         return -ENOMEM;
2348 }
2349
2350 static void
2351 kiblnd_tx_init(kib_pool_t *pool, struct list_head *node)
2352 {
2353         kib_tx_poolset_t *tps = container_of(pool->po_owner, kib_tx_poolset_t,
2354                                              tps_poolset);
2355         kib_tx_t         *tx  = list_entry(node, kib_tx_t, tx_list);
2356
2357         tx->tx_cookie = tps->tps_next_tx_cookie++;
2358 }
2359
2360 static void
2361 kiblnd_net_fini_pools(kib_net_t *net)
2362 {
2363         int     i;
2364
2365         cfs_cpt_for_each(i, lnet_cpt_table()) {
2366                 kib_tx_poolset_t        *tps;
2367                 kib_fmr_poolset_t       *fps;
2368
2369                 if (net->ibn_tx_ps != NULL) {
2370                         tps = net->ibn_tx_ps[i];
2371                         kiblnd_fini_poolset(&tps->tps_poolset);
2372                 }
2373
2374                 if (net->ibn_fmr_ps != NULL) {
2375                         fps = net->ibn_fmr_ps[i];
2376                         kiblnd_fini_fmr_poolset(fps);
2377                 }
2378         }
2379
2380         if (net->ibn_tx_ps != NULL) {
2381                 cfs_percpt_free(net->ibn_tx_ps);
2382                 net->ibn_tx_ps = NULL;
2383         }
2384
2385         if (net->ibn_fmr_ps != NULL) {
2386                 cfs_percpt_free(net->ibn_fmr_ps);
2387                 net->ibn_fmr_ps = NULL;
2388         }
2389 }
2390
2391 static int
2392 kiblnd_net_init_pools(kib_net_t *net, lnet_ni_t *ni, __u32 *cpts, int ncpts)
2393 {
2394         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2395         unsigned long   flags;
2396         int             cpt;
2397         int             rc;
2398         int             i;
2399
2400         tunables = &ni->ni_lnd_tunables->lt_tun_u.lt_o2ib;
2401
2402         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2403         if (tunables->lnd_map_on_demand == 0) {
2404                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2405                                            flags);
2406                 goto create_tx_pool;
2407         }
2408
2409         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2410
2411         if (tunables->lnd_fmr_pool_size < *kiblnd_tunables.kib_ntx / 4) {
2412                 CERROR("Can't set fmr pool size (%d) < ntx / 4(%d)\n",
2413                        tunables->lnd_fmr_pool_size,
2414                        *kiblnd_tunables.kib_ntx / 4);
2415                 rc = -EINVAL;
2416                 goto failed;
2417         }
2418
2419         /* TX pool must be created later than FMR, see LU-2268
2420          * for details */
2421         LASSERT(net->ibn_tx_ps == NULL);
2422
2423         /* premapping can fail if ibd_nmr > 1, so we always create
2424          * FMR pool and map-on-demand if premapping failed */
2425
2426         net->ibn_fmr_ps = cfs_percpt_alloc(lnet_cpt_table(),
2427                                            sizeof(kib_fmr_poolset_t));
2428         if (net->ibn_fmr_ps == NULL) {
2429                 CERROR("Failed to allocate FMR pool array\n");
2430                 rc = -ENOMEM;
2431                 goto failed;
2432         }
2433
2434         for (i = 0; i < ncpts; i++) {
2435                 cpt = (cpts == NULL) ? i : cpts[i];
2436                 rc = kiblnd_init_fmr_poolset(net->ibn_fmr_ps[cpt], cpt, ncpts,
2437                                              net, tunables);
2438                 if (rc != 0) {
2439                         CERROR("Can't initialize FMR pool for CPT %d: %d\n",
2440                                cpt, rc);
2441                         goto failed;
2442                 }
2443         }
2444
2445         if (i > 0)
2446                 LASSERT(i == ncpts);
2447
2448  create_tx_pool:
2449         net->ibn_tx_ps = cfs_percpt_alloc(lnet_cpt_table(),
2450                                           sizeof(kib_tx_poolset_t));
2451         if (net->ibn_tx_ps == NULL) {
2452                 CERROR("Failed to allocate tx pool array\n");
2453                 rc = -ENOMEM;
2454                 goto failed;
2455         }
2456
2457         for (i = 0; i < ncpts; i++) {
2458                 cpt = (cpts == NULL) ? i : cpts[i];
2459                 rc = kiblnd_init_poolset(&net->ibn_tx_ps[cpt]->tps_poolset,
2460                                          cpt, net, "TX",
2461                                          kiblnd_tx_pool_size(ncpts),
2462                                          kiblnd_create_tx_pool,
2463                                          kiblnd_destroy_tx_pool,
2464                                          kiblnd_tx_init, NULL);
2465                 if (rc != 0) {
2466                         CERROR("Can't initialize TX pool for CPT %d: %d\n",
2467                                cpt, rc);
2468                         goto failed;
2469                 }
2470         }
2471
2472         return 0;
2473  failed:
2474         kiblnd_net_fini_pools(net);
2475         LASSERT(rc != 0);
2476         return rc;
2477 }
2478
2479 static int
2480 kiblnd_hdev_get_attr(kib_hca_dev_t *hdev)
2481 {
2482 #ifndef HAVE_IB_DEVICE_ATTRS
2483         struct ib_device_attr *attr;
2484         int                    rc;
2485 #endif
2486
2487         /* It's safe to assume a HCA can handle a page size
2488          * matching that of the native system */
2489         hdev->ibh_page_shift = PAGE_SHIFT;
2490         hdev->ibh_page_size  = 1 << PAGE_SHIFT;
2491         hdev->ibh_page_mask  = ~((__u64)hdev->ibh_page_size - 1);
2492
2493 #ifdef HAVE_IB_DEVICE_ATTRS
2494         hdev->ibh_mr_size = hdev->ibh_ibdev->attrs.max_mr_size;
2495 #else
2496         LIBCFS_ALLOC(attr, sizeof(*attr));
2497         if (attr == NULL) {
2498                 CERROR("Out of memory\n");
2499                 return -ENOMEM;
2500         }
2501
2502         rc = ib_query_device(hdev->ibh_ibdev, attr);
2503         if (rc == 0)
2504                 hdev->ibh_mr_size = attr->max_mr_size;
2505
2506         LIBCFS_FREE(attr, sizeof(*attr));
2507
2508         if (rc != 0) {
2509                 CERROR("Failed to query IB device: %d\n", rc);
2510                 return rc;
2511         }
2512 #endif
2513
2514         if (hdev->ibh_mr_size == ~0ULL) {
2515                 hdev->ibh_mr_shift = 64;
2516                 return 0;
2517         }
2518
2519         CERROR("Invalid mr size: %#llx\n", hdev->ibh_mr_size);
2520         return -EINVAL;
2521 }
2522
2523 static void
2524 kiblnd_hdev_cleanup_mrs(kib_hca_dev_t *hdev)
2525 {
2526         if (hdev->ibh_mrs == NULL)
2527                 return;
2528
2529         ib_dereg_mr(hdev->ibh_mrs);
2530
2531         hdev->ibh_mrs = NULL;
2532 }
2533
2534 void
2535 kiblnd_hdev_destroy(kib_hca_dev_t *hdev)
2536 {
2537         kiblnd_hdev_cleanup_mrs(hdev);
2538
2539         if (hdev->ibh_pd != NULL)
2540                 ib_dealloc_pd(hdev->ibh_pd);
2541
2542         if (hdev->ibh_cmid != NULL)
2543                 rdma_destroy_id(hdev->ibh_cmid);
2544
2545         LIBCFS_FREE(hdev, sizeof(*hdev));
2546 }
2547
2548 static int
2549 kiblnd_hdev_setup_mrs(kib_hca_dev_t *hdev)
2550 {
2551         struct ib_mr *mr;
2552         int           rc;
2553         int           acflags = IB_ACCESS_LOCAL_WRITE |
2554                                 IB_ACCESS_REMOTE_WRITE;
2555
2556         rc = kiblnd_hdev_get_attr(hdev);
2557         if (rc != 0)
2558                 return rc;
2559
2560         mr = ib_get_dma_mr(hdev->ibh_pd, acflags);
2561         if (IS_ERR(mr)) {
2562                 CERROR("Failed ib_get_dma_mr: %ld\n", PTR_ERR(mr));
2563                 kiblnd_hdev_cleanup_mrs(hdev);
2564                 return PTR_ERR(mr);
2565         }
2566
2567         hdev->ibh_mrs = mr;
2568
2569         return 0;
2570 }
2571
2572 static int
2573 kiblnd_dummy_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2574 {       /* DUMMY */
2575         return 0;
2576 }
2577
2578 static int
2579 kiblnd_dev_need_failover(kib_dev_t *dev)
2580 {
2581         struct rdma_cm_id  *cmid;
2582         struct sockaddr_in  srcaddr;
2583         struct sockaddr_in  dstaddr;
2584         int                 rc;
2585
2586         if (dev->ibd_hdev == NULL || /* initializing */
2587             dev->ibd_hdev->ibh_cmid == NULL || /* listener is dead */
2588             *kiblnd_tunables.kib_dev_failover > 1) /* debugging */
2589                 return 1;
2590
2591         /* XXX: it's UGLY, but I don't have better way to find
2592          * ib-bonding HCA failover because:
2593          *
2594          * a. no reliable CM event for HCA failover...
2595          * b. no OFED API to get ib_device for current net_device...
2596          *
2597          * We have only two choices at this point:
2598          *
2599          * a. rdma_bind_addr(), it will conflict with listener cmid
2600          * b. rdma_resolve_addr() to zero addr */
2601         cmid = kiblnd_rdma_create_id(kiblnd_dummy_callback, dev, RDMA_PS_TCP,
2602                                      IB_QPT_RC);
2603         if (IS_ERR(cmid)) {
2604                 rc = PTR_ERR(cmid);
2605                 CERROR("Failed to create cmid for failover: %d\n", rc);
2606                 return rc;
2607         }
2608
2609         memset(&srcaddr, 0, sizeof(srcaddr));
2610         srcaddr.sin_family      = AF_INET;
2611         srcaddr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2612
2613         memset(&dstaddr, 0, sizeof(dstaddr));
2614         dstaddr.sin_family = AF_INET;
2615         rc = rdma_resolve_addr(cmid, (struct sockaddr *)&srcaddr,
2616                                (struct sockaddr *)&dstaddr, 1);
2617         if (rc != 0 || cmid->device == NULL) {
2618                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2619                        dev->ibd_ifname, &dev->ibd_ifip,
2620                        cmid->device, rc);
2621                 rdma_destroy_id(cmid);
2622                 return rc;
2623         }
2624
2625         rc = dev->ibd_hdev->ibh_ibdev != cmid->device; /* true for failover */
2626         rdma_destroy_id(cmid);
2627         return rc;
2628 }
2629
2630 int
2631 kiblnd_dev_failover(kib_dev_t *dev)
2632 {
2633         struct list_head    zombie_tpo = LIST_HEAD_INIT(zombie_tpo);
2634         struct list_head    zombie_ppo = LIST_HEAD_INIT(zombie_ppo);
2635         struct list_head    zombie_fpo = LIST_HEAD_INIT(zombie_fpo);
2636         struct rdma_cm_id  *cmid  = NULL;
2637         kib_hca_dev_t      *hdev  = NULL;
2638         kib_hca_dev_t      *old;
2639         struct ib_pd       *pd;
2640         kib_net_t          *net;
2641         struct sockaddr_in  addr;
2642         unsigned long       flags;
2643         int                 rc = 0;
2644         int                 i;
2645
2646         LASSERT (*kiblnd_tunables.kib_dev_failover > 1 ||
2647                  dev->ibd_can_failover ||
2648                  dev->ibd_hdev == NULL);
2649
2650         rc = kiblnd_dev_need_failover(dev);
2651         if (rc <= 0)
2652                 goto out;
2653
2654         if (dev->ibd_hdev != NULL &&
2655             dev->ibd_hdev->ibh_cmid != NULL) {
2656                 /* XXX it's not good to close old listener at here,
2657                  * because we can fail to create new listener.
2658                  * But we have to close it now, otherwise rdma_bind_addr
2659                  * will return EADDRINUSE... How crap! */
2660                 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2661
2662                 cmid = dev->ibd_hdev->ibh_cmid;
2663                 /* make next schedule of kiblnd_dev_need_failover()
2664                  * return 1 for me */
2665                 dev->ibd_hdev->ibh_cmid  = NULL;
2666                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2667
2668                 rdma_destroy_id(cmid);
2669         }
2670
2671         cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, dev, RDMA_PS_TCP,
2672                                      IB_QPT_RC);
2673         if (IS_ERR(cmid)) {
2674                 rc = PTR_ERR(cmid);
2675                 CERROR("Failed to create cmid for failover: %d\n", rc);
2676                 goto out;
2677         }
2678
2679         memset(&addr, 0, sizeof(addr));
2680         addr.sin_family      = AF_INET;
2681         addr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2682         addr.sin_port        = htons(*kiblnd_tunables.kib_service);
2683
2684         /* Bind to failover device or port */
2685         rc = rdma_bind_addr(cmid, (struct sockaddr *)&addr);
2686         if (rc != 0 || cmid->device == NULL) {
2687                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2688                        dev->ibd_ifname, &dev->ibd_ifip,
2689                        cmid->device, rc);
2690                 rdma_destroy_id(cmid);
2691                 goto out;
2692         }
2693
2694         LIBCFS_ALLOC(hdev, sizeof(*hdev));
2695         if (hdev == NULL) {
2696                 CERROR("Failed to allocate kib_hca_dev\n");
2697                 rdma_destroy_id(cmid);
2698                 rc = -ENOMEM;
2699                 goto out;
2700         }
2701
2702         atomic_set(&hdev->ibh_ref, 1);
2703         hdev->ibh_dev   = dev;
2704         hdev->ibh_cmid  = cmid;
2705         hdev->ibh_ibdev = cmid->device;
2706
2707         pd = ib_alloc_pd(cmid->device);
2708         if (IS_ERR(pd)) {
2709                 rc = PTR_ERR(pd);
2710                 CERROR("Can't allocate PD: %d\n", rc);
2711                 goto out;
2712         }
2713
2714         hdev->ibh_pd = pd;
2715
2716         rc = rdma_listen(cmid, 0);
2717         if (rc != 0) {
2718                 CERROR("Can't start new listener: %d\n", rc);
2719                 goto out;
2720         }
2721
2722         rc = kiblnd_hdev_setup_mrs(hdev);
2723         if (rc != 0) {
2724                 CERROR("Can't setup device: %d\n", rc);
2725                 goto out;
2726         }
2727
2728         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2729
2730         old = dev->ibd_hdev;
2731         dev->ibd_hdev = hdev;   /* take over the refcount */
2732         hdev = old;
2733
2734         list_for_each_entry(net, &dev->ibd_nets, ibn_list) {
2735                 cfs_cpt_for_each(i, lnet_cpt_table()) {
2736                         kiblnd_fail_poolset(&net->ibn_tx_ps[i]->tps_poolset,
2737                                             &zombie_tpo);
2738
2739                         if (net->ibn_fmr_ps != NULL)
2740                                 kiblnd_fail_fmr_poolset(net->ibn_fmr_ps[i],
2741                                                         &zombie_fpo);
2742                 }
2743         }
2744
2745         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2746  out:
2747         if (!list_empty(&zombie_tpo))
2748                 kiblnd_destroy_pool_list(&zombie_tpo);
2749         if (!list_empty(&zombie_ppo))
2750                 kiblnd_destroy_pool_list(&zombie_ppo);
2751         if (!list_empty(&zombie_fpo))
2752                 kiblnd_destroy_fmr_pool_list(&zombie_fpo);
2753         if (hdev != NULL)
2754                 kiblnd_hdev_decref(hdev);
2755
2756         if (rc != 0)
2757                 dev->ibd_failed_failover++;
2758         else
2759                 dev->ibd_failed_failover = 0;
2760
2761         return rc;
2762 }
2763
2764 void
2765 kiblnd_destroy_dev (kib_dev_t *dev)
2766 {
2767         LASSERT (dev->ibd_nnets == 0);
2768         LASSERT(list_empty(&dev->ibd_nets));
2769
2770         list_del(&dev->ibd_fail_list);
2771         list_del(&dev->ibd_list);
2772
2773         if (dev->ibd_hdev != NULL)
2774                 kiblnd_hdev_decref(dev->ibd_hdev);
2775
2776         LIBCFS_FREE(dev, sizeof(*dev));
2777 }
2778
2779 static kib_dev_t *
2780 kiblnd_create_dev(char *ifname)
2781 {
2782         struct net_device *netdev;
2783         kib_dev_t         *dev;
2784         __u32              netmask;
2785         __u32              ip;
2786         int                up;
2787         int                rc;
2788
2789         rc = lnet_ipif_query(ifname, &up, &ip, &netmask);
2790         if (rc != 0) {
2791                 CERROR("Can't query IPoIB interface %s: %d\n",
2792                        ifname, rc);
2793                 return NULL;
2794         }
2795
2796         if (!up) {
2797                 CERROR("Can't query IPoIB interface %s: it's down\n", ifname);
2798                 return NULL;
2799         }
2800
2801         LIBCFS_ALLOC(dev, sizeof(*dev));
2802         if (dev == NULL)
2803                 return NULL;
2804
2805         netdev = dev_get_by_name(&init_net, ifname);
2806         if (netdev == NULL) {
2807                 dev->ibd_can_failover = 0;
2808         } else {
2809                 dev->ibd_can_failover = !!(netdev->flags & IFF_MASTER);
2810                 dev_put(netdev);
2811         }
2812
2813         INIT_LIST_HEAD(&dev->ibd_nets);
2814         INIT_LIST_HEAD(&dev->ibd_list); /* not yet in kib_devs */
2815         INIT_LIST_HEAD(&dev->ibd_fail_list);
2816         dev->ibd_ifip = ip;
2817         strcpy(&dev->ibd_ifname[0], ifname);
2818
2819         /* initialize the device */
2820         rc = kiblnd_dev_failover(dev);
2821         if (rc != 0) {
2822                 CERROR("Can't initialize device: %d\n", rc);
2823                 LIBCFS_FREE(dev, sizeof(*dev));
2824                 return NULL;
2825         }
2826
2827         list_add_tail(&dev->ibd_list,
2828                           &kiblnd_data.kib_devs);
2829         return dev;
2830 }
2831
2832 static void
2833 kiblnd_base_shutdown(void)
2834 {
2835         struct kib_sched_info   *sched;
2836         int                     i;
2837
2838         LASSERT(list_empty(&kiblnd_data.kib_devs));
2839
2840         CDEBUG(D_MALLOC, "before LND base cleanup: kmem %d\n",
2841                atomic_read(&libcfs_kmemory));
2842
2843         switch (kiblnd_data.kib_init) {
2844         default:
2845                 LBUG();
2846
2847         case IBLND_INIT_ALL:
2848         case IBLND_INIT_DATA:
2849                 LASSERT (kiblnd_data.kib_peers != NULL);
2850                 for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
2851                         LASSERT(list_empty(&kiblnd_data.kib_peers[i]));
2852                 }
2853                 LASSERT(list_empty(&kiblnd_data.kib_connd_zombies));
2854                 LASSERT(list_empty(&kiblnd_data.kib_connd_conns));
2855                 LASSERT(list_empty(&kiblnd_data.kib_reconn_list));
2856                 LASSERT(list_empty(&kiblnd_data.kib_reconn_wait));
2857
2858                 /* flag threads to terminate; wake and wait for them to die */
2859                 kiblnd_data.kib_shutdown = 1;
2860
2861                 /* NB: we really want to stop scheduler threads net by net
2862                  * instead of the whole module, this should be improved
2863                  * with dynamic configuration LNet */
2864                 cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds)
2865                         wake_up_all(&sched->ibs_waitq);
2866
2867                 wake_up_all(&kiblnd_data.kib_connd_waitq);
2868                 wake_up_all(&kiblnd_data.kib_failover_waitq);
2869
2870                 i = 2;
2871                 while (atomic_read(&kiblnd_data.kib_nthreads) != 0) {
2872                         i++;
2873                         /* power of 2? */
2874                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2875                                "Waiting for %d threads to terminate\n",
2876                                atomic_read(&kiblnd_data.kib_nthreads));
2877                         set_current_state(TASK_UNINTERRUPTIBLE);
2878                         schedule_timeout(cfs_time_seconds(1));
2879                 }
2880
2881                 /* fall through */
2882
2883         case IBLND_INIT_NOTHING:
2884                 break;
2885         }
2886
2887         if (kiblnd_data.kib_peers != NULL) {
2888                 LIBCFS_FREE(kiblnd_data.kib_peers,
2889                             sizeof(struct list_head) *
2890                             kiblnd_data.kib_peer_hash_size);
2891         }
2892
2893         if (kiblnd_data.kib_scheds != NULL)
2894                 cfs_percpt_free(kiblnd_data.kib_scheds);
2895
2896         CDEBUG(D_MALLOC, "after LND base cleanup: kmem %d\n",
2897                atomic_read(&libcfs_kmemory));
2898
2899         kiblnd_data.kib_init = IBLND_INIT_NOTHING;
2900         module_put(THIS_MODULE);
2901 }
2902
2903 static void
2904 kiblnd_shutdown (lnet_ni_t *ni)
2905 {
2906         kib_net_t        *net = ni->ni_data;
2907         rwlock_t     *g_lock = &kiblnd_data.kib_global_lock;
2908         int               i;
2909         unsigned long     flags;
2910
2911         LASSERT(kiblnd_data.kib_init == IBLND_INIT_ALL);
2912
2913         if (net == NULL)
2914                 goto out;
2915
2916         CDEBUG(D_MALLOC, "before LND net cleanup: kmem %d\n",
2917                atomic_read(&libcfs_kmemory));
2918
2919         write_lock_irqsave(g_lock, flags);
2920         net->ibn_shutdown = 1;
2921         write_unlock_irqrestore(g_lock, flags);
2922
2923         switch (net->ibn_init) {
2924         default:
2925                 LBUG();
2926
2927         case IBLND_INIT_ALL:
2928                 /* nuke all existing peers within this net */
2929                 kiblnd_del_peer(ni, LNET_NID_ANY);
2930
2931                 /* Wait for all peer state to clean up */
2932                 i = 2;
2933                 while (atomic_read(&net->ibn_npeers) != 0) {
2934                         i++;
2935                         /* power of 2? */
2936                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2937                                "%s: waiting for %d peers to disconnect\n",
2938                                libcfs_nid2str(ni->ni_nid),
2939                                atomic_read(&net->ibn_npeers));
2940                         set_current_state(TASK_UNINTERRUPTIBLE);
2941                         schedule_timeout(cfs_time_seconds(1));
2942                 }
2943
2944                 kiblnd_net_fini_pools(net);
2945
2946                 write_lock_irqsave(g_lock, flags);
2947                 LASSERT(net->ibn_dev->ibd_nnets > 0);
2948                 net->ibn_dev->ibd_nnets--;
2949                 list_del(&net->ibn_list);
2950                 write_unlock_irqrestore(g_lock, flags);
2951
2952                 /* fall through */
2953
2954         case IBLND_INIT_NOTHING:
2955                 LASSERT (atomic_read(&net->ibn_nconns) == 0);
2956
2957                 if (net->ibn_dev != NULL &&
2958                     net->ibn_dev->ibd_nnets == 0)
2959                         kiblnd_destroy_dev(net->ibn_dev);
2960
2961                 break;
2962         }
2963
2964         CDEBUG(D_MALLOC, "after LND net cleanup: kmem %d\n",
2965                atomic_read(&libcfs_kmemory));
2966
2967         net->ibn_init = IBLND_INIT_NOTHING;
2968         ni->ni_data = NULL;
2969
2970         LIBCFS_FREE(net, sizeof(*net));
2971
2972 out:
2973         if (list_empty(&kiblnd_data.kib_devs))
2974                 kiblnd_base_shutdown();
2975         return;
2976 }
2977
2978 static int
2979 kiblnd_base_startup(void)
2980 {
2981         struct kib_sched_info   *sched;
2982         int                     rc;
2983         int                     i;
2984
2985         LASSERT(kiblnd_data.kib_init == IBLND_INIT_NOTHING);
2986
2987         try_module_get(THIS_MODULE);
2988         memset(&kiblnd_data, 0, sizeof(kiblnd_data)); /* zero pointers, flags etc */
2989
2990         rwlock_init(&kiblnd_data.kib_global_lock);
2991
2992         INIT_LIST_HEAD(&kiblnd_data.kib_devs);
2993         INIT_LIST_HEAD(&kiblnd_data.kib_failed_devs);
2994
2995         kiblnd_data.kib_peer_hash_size = IBLND_PEER_HASH_SIZE;
2996         LIBCFS_ALLOC(kiblnd_data.kib_peers,
2997                      sizeof(struct list_head) *
2998                      kiblnd_data.kib_peer_hash_size);
2999         if (kiblnd_data.kib_peers == NULL)
3000                 goto failed;
3001
3002         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++)
3003                 INIT_LIST_HEAD(&kiblnd_data.kib_peers[i]);
3004
3005         spin_lock_init(&kiblnd_data.kib_connd_lock);
3006         INIT_LIST_HEAD(&kiblnd_data.kib_connd_conns);
3007         INIT_LIST_HEAD(&kiblnd_data.kib_connd_zombies);
3008         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_list);
3009         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_wait);
3010
3011         init_waitqueue_head(&kiblnd_data.kib_connd_waitq);
3012         init_waitqueue_head(&kiblnd_data.kib_failover_waitq);
3013
3014         kiblnd_data.kib_scheds = cfs_percpt_alloc(lnet_cpt_table(),
3015                                                   sizeof(*sched));
3016         if (kiblnd_data.kib_scheds == NULL)
3017                 goto failed;
3018
3019         cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
3020                 int     nthrs;
3021
3022                 spin_lock_init(&sched->ibs_lock);
3023                 INIT_LIST_HEAD(&sched->ibs_conns);
3024                 init_waitqueue_head(&sched->ibs_waitq);
3025
3026                 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
3027                 if (*kiblnd_tunables.kib_nscheds > 0) {
3028                         nthrs = min(nthrs, *kiblnd_tunables.kib_nscheds);
3029                 } else {
3030                         /* max to half of CPUs, another half is reserved for
3031                          * upper layer modules */
3032                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
3033                 }
3034
3035                 sched->ibs_nthreads_max = nthrs;
3036                 sched->ibs_cpt = i;
3037         }
3038
3039         kiblnd_data.kib_error_qpa.qp_state = IB_QPS_ERR;
3040
3041         /* lists/ptrs/locks initialised */
3042         kiblnd_data.kib_init = IBLND_INIT_DATA;
3043         /*****************************************************/
3044
3045         rc = kiblnd_thread_start(kiblnd_connd, NULL, "kiblnd_connd");
3046         if (rc != 0) {
3047                 CERROR("Can't spawn o2iblnd connd: %d\n", rc);
3048                 goto failed;
3049         }
3050
3051         if (*kiblnd_tunables.kib_dev_failover != 0)
3052                 rc = kiblnd_thread_start(kiblnd_failover_thread, NULL,
3053                                          "kiblnd_failover");
3054
3055         if (rc != 0) {
3056                 CERROR("Can't spawn o2iblnd failover thread: %d\n", rc);
3057                 goto failed;
3058         }
3059
3060         /* flag everything initialised */
3061         kiblnd_data.kib_init = IBLND_INIT_ALL;
3062         /*****************************************************/
3063
3064         return 0;
3065
3066  failed:
3067         kiblnd_base_shutdown();
3068         return -ENETDOWN;
3069 }
3070
3071 static int
3072 kiblnd_start_schedulers(struct kib_sched_info *sched)
3073 {
3074         int     rc = 0;
3075         int     nthrs;
3076         int     i;
3077
3078         if (sched->ibs_nthreads == 0) {
3079                 if (*kiblnd_tunables.kib_nscheds > 0) {
3080                         nthrs = sched->ibs_nthreads_max;
3081                 } else {
3082                         nthrs = cfs_cpt_weight(lnet_cpt_table(),
3083                                                sched->ibs_cpt);
3084                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
3085                         nthrs = min(IBLND_N_SCHED_HIGH, nthrs);
3086                 }
3087         } else {
3088                 LASSERT(sched->ibs_nthreads <= sched->ibs_nthreads_max);
3089                 /* increase one thread if there is new interface */
3090                 nthrs = (sched->ibs_nthreads < sched->ibs_nthreads_max);
3091         }
3092
3093         for (i = 0; i < nthrs; i++) {
3094                 long    id;
3095                 char    name[20];
3096                 id = KIB_THREAD_ID(sched->ibs_cpt, sched->ibs_nthreads + i);
3097                 snprintf(name, sizeof(name), "kiblnd_sd_%02ld_%02ld",
3098                          KIB_THREAD_CPT(id), KIB_THREAD_TID(id));
3099                 rc = kiblnd_thread_start(kiblnd_scheduler, (void *)id, name);
3100                 if (rc == 0)
3101                         continue;
3102
3103                 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
3104                        sched->ibs_cpt, sched->ibs_nthreads + i, rc);
3105                 break;
3106         }
3107
3108         sched->ibs_nthreads += i;
3109         return rc;
3110 }
3111
3112 static int
3113 kiblnd_dev_start_threads(kib_dev_t *dev, int newdev, __u32 *cpts, int ncpts)
3114 {
3115         int     cpt;
3116         int     rc;
3117         int     i;
3118
3119         for (i = 0; i < ncpts; i++) {
3120                 struct kib_sched_info *sched;
3121
3122                 cpt = (cpts == NULL) ? i : cpts[i];
3123                 sched = kiblnd_data.kib_scheds[cpt];
3124
3125                 if (!newdev && sched->ibs_nthreads > 0)
3126                         continue;
3127
3128                 rc = kiblnd_start_schedulers(kiblnd_data.kib_scheds[cpt]);
3129                 if (rc != 0) {
3130                         CERROR("Failed to start scheduler threads for %s\n",
3131                                dev->ibd_ifname);
3132                         return rc;
3133                 }
3134         }
3135         return 0;
3136 }
3137
3138 static kib_dev_t *
3139 kiblnd_dev_search(char *ifname)
3140 {
3141         kib_dev_t       *alias = NULL;
3142         kib_dev_t       *dev;
3143         char            *colon;
3144         char            *colon2;
3145
3146         colon = strchr(ifname, ':');
3147         list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3148                 if (strcmp(&dev->ibd_ifname[0], ifname) == 0)
3149                         return dev;
3150
3151                 if (alias != NULL)
3152                         continue;
3153
3154                 colon2 = strchr(dev->ibd_ifname, ':');
3155                 if (colon != NULL)
3156                         *colon = 0;
3157                 if (colon2 != NULL)
3158                         *colon2 = 0;
3159
3160                 if (strcmp(&dev->ibd_ifname[0], ifname) == 0)
3161                         alias = dev;
3162
3163                 if (colon != NULL)
3164                         *colon = ':';
3165                 if (colon2 != NULL)
3166                         *colon2 = ':';
3167         }
3168         return alias;
3169 }
3170
3171 static int
3172 kiblnd_startup (lnet_ni_t *ni)
3173 {
3174         char                     *ifname;
3175         kib_dev_t                *ibdev = NULL;
3176         kib_net_t                *net;
3177         struct timeval            tv;
3178         unsigned long             flags;
3179         int                       rc;
3180         int                       newdev;
3181
3182         LASSERT (ni->ni_lnd == &the_o2iblnd);
3183
3184         if (kiblnd_data.kib_init == IBLND_INIT_NOTHING) {
3185                 rc = kiblnd_base_startup();
3186                 if (rc != 0)
3187                         return rc;
3188         }
3189
3190         LIBCFS_ALLOC(net, sizeof(*net));
3191         ni->ni_data = net;
3192         if (net == NULL)
3193                 goto failed;
3194
3195         do_gettimeofday(&tv);
3196         net->ibn_incarnation = (((__u64)tv.tv_sec) * 1000000) + tv.tv_usec;
3197
3198         kiblnd_tunables_setup(ni);
3199
3200         if (ni->ni_interfaces[0] != NULL) {
3201                 /* Use the IPoIB interface specified in 'networks=' */
3202
3203                 CLASSERT (LNET_MAX_INTERFACES > 1);
3204                 if (ni->ni_interfaces[1] != NULL) {
3205                         CERROR("Multiple interfaces not supported\n");
3206                         goto failed;
3207                 }
3208
3209                 ifname = ni->ni_interfaces[0];
3210         } else {
3211                 ifname = *kiblnd_tunables.kib_default_ipif;
3212         }
3213
3214         if (strlen(ifname) >= sizeof(ibdev->ibd_ifname)) {
3215                 CERROR("IPoIB interface name too long: %s\n", ifname);
3216                 goto failed;
3217         }
3218
3219         ibdev = kiblnd_dev_search(ifname);
3220
3221         newdev = ibdev == NULL;
3222         /* hmm...create kib_dev even for alias */
3223         if (ibdev == NULL || strcmp(&ibdev->ibd_ifname[0], ifname) != 0)
3224                 ibdev = kiblnd_create_dev(ifname);
3225
3226         if (ibdev == NULL)
3227                 goto failed;
3228
3229         net->ibn_dev = ibdev;
3230         ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), ibdev->ibd_ifip);
3231
3232         rc = kiblnd_dev_start_threads(ibdev, newdev,
3233                                       ni->ni_cpts, ni->ni_ncpts);
3234         if (rc != 0)
3235                 goto failed;
3236
3237         rc = kiblnd_net_init_pools(net, ni, ni->ni_cpts, ni->ni_ncpts);
3238         if (rc != 0) {
3239                 CERROR("Failed to initialize NI pools: %d\n", rc);
3240                 goto failed;
3241         }
3242
3243         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3244         ibdev->ibd_nnets++;
3245         list_add_tail(&net->ibn_list, &ibdev->ibd_nets);
3246         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3247
3248         net->ibn_init = IBLND_INIT_ALL;
3249
3250         return 0;
3251
3252 failed:
3253         if (net != NULL && net->ibn_dev == NULL && ibdev != NULL)
3254                 kiblnd_destroy_dev(ibdev);
3255
3256         kiblnd_shutdown(ni);
3257
3258         CDEBUG(D_NET, "kiblnd_startup failed\n");
3259         return -ENETDOWN;
3260 }
3261
3262 static lnd_t the_o2iblnd = {
3263         .lnd_type       = O2IBLND,
3264         .lnd_startup    = kiblnd_startup,
3265         .lnd_shutdown   = kiblnd_shutdown,
3266         .lnd_ctl        = kiblnd_ctl,
3267         .lnd_query      = kiblnd_query,
3268         .lnd_send       = kiblnd_send,
3269         .lnd_recv       = kiblnd_recv,
3270 };
3271
3272 static void __exit ko2iblnd_exit(void)
3273 {
3274         lnet_unregister_lnd(&the_o2iblnd);
3275 }
3276
3277 static int __init ko2iblnd_init(void)
3278 {
3279         int rc;
3280
3281         CLASSERT(sizeof(kib_msg_t) <= IBLND_MSG_SIZE);
3282         CLASSERT(offsetof(kib_msg_t,
3283                           ibm_u.get.ibgm_rd.rd_frags[IBLND_MAX_RDMA_FRAGS]) <=
3284                  IBLND_MSG_SIZE);
3285         CLASSERT(offsetof(kib_msg_t,
3286                           ibm_u.putack.ibpam_rd.rd_frags[IBLND_MAX_RDMA_FRAGS])
3287                  <= IBLND_MSG_SIZE);
3288
3289         rc = kiblnd_tunables_init();
3290         if (rc != 0)
3291                 return rc;
3292
3293         lnet_register_lnd(&the_o2iblnd);
3294
3295         return 0;
3296 }
3297
3298 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3299 MODULE_DESCRIPTION("OpenIB gen2 LNet Network Driver");
3300 MODULE_VERSION("2.8.0");
3301 MODULE_LICENSE("GPL");
3302
3303 module_init(ko2iblnd_init);
3304 module_exit(ko2iblnd_exit);