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, Whamcloud, Inc.
  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 "o2iblnd.h"
  42
  43 lnd_t the_o2iblnd = {
  44         .lnd_type       = O2IBLND,
  45         .lnd_startup    = kiblnd_startup,
  46         .lnd_shutdown   = kiblnd_shutdown,
  47         .lnd_ctl        = kiblnd_ctl,
  48         .lnd_query      = kiblnd_query,
  49         .lnd_send       = kiblnd_send,
  50         .lnd_recv       = kiblnd_recv,
  51 };
  52
  53 kib_data_t              kiblnd_data;
  54
  55 __u32
  56 kiblnd_cksum (void *ptr, int nob)
  57 {
  58         char  *c  = ptr;
  59         __u32  sum = 0;
  60
  61         while (nob-- > 0)
  62                 sum = ((sum << 1) | (sum >> 31)) + *c++;
  63
  64         /* ensure I don't return 0 (== no checksum) */
  65         return (sum == 0) ? 1 : sum;
  66 }
  67
  68 static char *
  69 kiblnd_msgtype2str(int type)
  70 {
  71         switch (type) {
  72         case IBLND_MSG_CONNREQ:
  73                 return "CONNREQ";
  74
  75         case IBLND_MSG_CONNACK:
  76                 return "CONNACK";
  77
  78         case IBLND_MSG_NOOP:
  79                 return "NOOP";
  80
  81         case IBLND_MSG_IMMEDIATE:
  82                 return "IMMEDIATE";
  83
  84         case IBLND_MSG_PUT_REQ:
  85                 return "PUT_REQ";
  86
  87         case IBLND_MSG_PUT_NAK:
  88                 return "PUT_NAK";
  89
  90         case IBLND_MSG_PUT_ACK:
  91                 return "PUT_ACK";
  92
  93         case IBLND_MSG_PUT_DONE:
  94                 return "PUT_DONE";
  95
  96         case IBLND_MSG_GET_REQ:
  97                 return "GET_REQ";
  98
  99         case IBLND_MSG_GET_DONE:
 100                 return "GET_DONE";
 101
 102         default:
 103                 return "???";
 104         }
 105 }
 106
 107 static int
 108 kiblnd_msgtype2size(int type)
 109 {
 110         const int hdr_size = offsetof(kib_msg_t, ibm_u);
 111
 112         switch (type) {
 113         case IBLND_MSG_CONNREQ:
 114         case IBLND_MSG_CONNACK:
 115                 return hdr_size + sizeof(kib_connparams_t);
 116
 117         case IBLND_MSG_NOOP:
 118                 return hdr_size;
 119
 120         case IBLND_MSG_IMMEDIATE:
 121                 return offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[0]);
 122
 123         case IBLND_MSG_PUT_REQ:
 124                 return hdr_size + sizeof(kib_putreq_msg_t);
 125
 126         case IBLND_MSG_PUT_ACK:
 127                 return hdr_size + sizeof(kib_putack_msg_t);
 128
 129         case IBLND_MSG_GET_REQ:
 130                 return hdr_size + sizeof(kib_get_msg_t);
 131
 132         case IBLND_MSG_PUT_NAK:
 133         case IBLND_MSG_PUT_DONE:
 134         case IBLND_MSG_GET_DONE:
 135                 return hdr_size + sizeof(kib_completion_msg_t);
 136         default:
 137                 return -1;
 138         }
 139 }
 140
 141 static int
 142 kiblnd_unpack_rd(kib_msg_t *msg, int flip)
 143 {
 144         kib_rdma_desc_t   *rd;
 145         int                nob;
 146         int                n;
 147         int                i;
 148
 149         LASSERT (msg->ibm_type == IBLND_MSG_GET_REQ ||
 150                  msg->ibm_type == IBLND_MSG_PUT_ACK);
 151
 152         rd = msg->ibm_type == IBLND_MSG_GET_REQ ?
 153                               &msg->ibm_u.get.ibgm_rd :
 154                               &msg->ibm_u.putack.ibpam_rd;
 155
 156         if (flip) {
 157                 __swab32s(&rd->rd_key);
 158                 __swab32s(&rd->rd_nfrags);
 159         }
 160
 161         n = rd->rd_nfrags;
 162
 163         if (n <= 0 || n > IBLND_MAX_RDMA_FRAGS) {
 164                 CERROR("Bad nfrags: %d, should be 0 < n <= %d\n",
 165                        n, IBLND_MAX_RDMA_FRAGS);
 166                 return 1;
 167         }
 168
 169         nob = offsetof (kib_msg_t, ibm_u) +
 170               kiblnd_rd_msg_size(rd, msg->ibm_type, n);
 171
 172         if (msg->ibm_nob < nob) {
 173                 CERROR("Short %s: %d(%d)\n",
 174                        kiblnd_msgtype2str(msg->ibm_type), msg->ibm_nob, nob);
 175                 return 1;
 176         }
 177
 178         if (!flip)
 179                 return 0;
 180
 181         for (i = 0; i < n; i++) {
 182                 __swab32s(&rd->rd_frags[i].rf_nob);
 183                 __swab64s(&rd->rd_frags[i].rf_addr);
 184         }
 185
 186         return 0;
 187 }
 188
 189 void
 190 kiblnd_pack_msg (lnet_ni_t *ni, kib_msg_t *msg, int version,
 191                  int credits, lnet_nid_t dstnid, __u64 dststamp)
 192 {
 193         kib_net_t *net = ni->ni_data;
 194
 195         /* CAVEAT EMPTOR! all message fields not set here should have been
 196          * initialised previously. */
 197         msg->ibm_magic    = IBLND_MSG_MAGIC;
 198         msg->ibm_version  = version;
 199         /*   ibm_type */
 200         msg->ibm_credits  = credits;
 201         /*   ibm_nob */
 202         msg->ibm_cksum    = 0;
 203         msg->ibm_srcnid   = ni->ni_nid;
 204         msg->ibm_srcstamp = net->ibn_incarnation;
 205         msg->ibm_dstnid   = dstnid;
 206         msg->ibm_dststamp = dststamp;
 207
 208         if (*kiblnd_tunables.kib_cksum) {
 209                 /* NB ibm_cksum zero while computing cksum */
 210                 msg->ibm_cksum = kiblnd_cksum(msg, msg->ibm_nob);
 211         }
 212 }
 213
 214 int
 215 kiblnd_unpack_msg(kib_msg_t *msg, int nob)
 216 {
 217         const int hdr_size = offsetof(kib_msg_t, ibm_u);
 218         __u32     msg_cksum;
 219         __u16     version;
 220         int       msg_nob;
 221         int       flip;
 222
 223         /* 6 bytes are enough to have received magic + version */
 224         if (nob < 6) {
 225                 CERROR("Short message: %d\n", nob);
 226                 return -EPROTO;
 227         }
 228
 229         if (msg->ibm_magic == IBLND_MSG_MAGIC) {
 230                 flip = 0;
 231         } else if (msg->ibm_magic == __swab32(IBLND_MSG_MAGIC)) {
 232                 flip = 1;
 233         } else {
 234                 CERROR("Bad magic: %08x\n", msg->ibm_magic);
 235                 return -EPROTO;
 236         }
 237
 238         version = flip ? __swab16(msg->ibm_version) : msg->ibm_version;
 239         if (version != IBLND_MSG_VERSION &&
 240             version != IBLND_MSG_VERSION_1) {
 241                 CERROR("Bad version: %x\n", version);
 242                 return -EPROTO;
 243         }
 244
 245         if (nob < hdr_size) {
 246                 CERROR("Short message: %d\n", nob);
 247                 return -EPROTO;
 248         }
 249
 250         msg_nob = flip ? __swab32(msg->ibm_nob) : msg->ibm_nob;
 251         if (msg_nob > nob) {
 252                 CERROR("Short message: got %d, wanted %d\n", nob, msg_nob);
 253                 return -EPROTO;
 254         }
 255
 256         /* checksum must be computed with ibm_cksum zero and BEFORE anything
 257          * gets flipped */
 258         msg_cksum = flip ? __swab32(msg->ibm_cksum) : msg->ibm_cksum;
 259         msg->ibm_cksum = 0;
 260         if (msg_cksum != 0 &&
 261             msg_cksum != kiblnd_cksum(msg, msg_nob)) {
 262                 CERROR("Bad checksum\n");
 263                 return -EPROTO;
 264         }
 265
 266         msg->ibm_cksum = msg_cksum;
 267
 268         if (flip) {
 269                 /* leave magic unflipped as a clue to peer endianness */
 270                 msg->ibm_version = version;
 271                 CLASSERT (sizeof(msg->ibm_type) == 1);
 272                 CLASSERT (sizeof(msg->ibm_credits) == 1);
 273                 msg->ibm_nob     = msg_nob;
 274                 __swab64s(&msg->ibm_srcnid);
 275                 __swab64s(&msg->ibm_srcstamp);
 276                 __swab64s(&msg->ibm_dstnid);
 277                 __swab64s(&msg->ibm_dststamp);
 278         }
 279
 280         if (msg->ibm_srcnid == LNET_NID_ANY) {
 281                 CERROR("Bad src nid: %s\n", libcfs_nid2str(msg->ibm_srcnid));
 282                 return -EPROTO;
 283         }
 284
 285         if (msg_nob < kiblnd_msgtype2size(msg->ibm_type)) {
 286                 CERROR("Short %s: %d(%d)\n", kiblnd_msgtype2str(msg->ibm_type),
 287                        msg_nob, kiblnd_msgtype2size(msg->ibm_type));
 288                 return -EPROTO;
 289         }
 290
 291         switch (msg->ibm_type) {
 292         default:
 293                 CERROR("Unknown message type %x\n", msg->ibm_type);
 294                 return -EPROTO;
 295
 296         case IBLND_MSG_NOOP:
 297         case IBLND_MSG_IMMEDIATE:
 298         case IBLND_MSG_PUT_REQ:
 299                 break;
 300
 301         case IBLND_MSG_PUT_ACK:
 302         case IBLND_MSG_GET_REQ:
 303                 if (kiblnd_unpack_rd(msg, flip))
 304                         return -EPROTO;
 305                 break;
 306
 307         case IBLND_MSG_PUT_NAK:
 308         case IBLND_MSG_PUT_DONE:
 309         case IBLND_MSG_GET_DONE:
 310                 if (flip)
 311                         __swab32s(&msg->ibm_u.completion.ibcm_status);
 312                 break;
 313
 314         case IBLND_MSG_CONNREQ:
 315         case IBLND_MSG_CONNACK:
 316                 if (flip) {
 317                         __swab16s(&msg->ibm_u.connparams.ibcp_queue_depth);
 318                         __swab16s(&msg->ibm_u.connparams.ibcp_max_frags);
 319                         __swab32s(&msg->ibm_u.connparams.ibcp_max_msg_size);
 320                 }
 321                 break;
 322         }
 323         return 0;
 324 }
 325
 326 int
 327 kiblnd_create_peer (lnet_ni_t *ni, kib_peer_t **peerp, lnet_nid_t nid)
 328 {
 329         kib_peer_t     *peer;
 330         kib_net_t      *net = ni->ni_data;
 331         unsigned long   flags;
 332
 333         LASSERT (net != NULL);
 334         LASSERT (nid != LNET_NID_ANY);
 335
 336         LIBCFS_ALLOC(peer, sizeof(*peer));
 337         if (peer == NULL) {
 338                 CERROR("Cannot allocate peer\n");
 339                 return -ENOMEM;
 340         }
 341
 342         memset(peer, 0, sizeof(*peer));         /* zero flags etc */
 343
 344         peer->ibp_ni = ni;
 345         peer->ibp_nid = nid;
 346         peer->ibp_error = 0;
 347         peer->ibp_last_alive = 0;
 348         cfs_atomic_set(&peer->ibp_refcount, 1);  /* 1 ref for caller */
 349
 350         CFS_INIT_LIST_HEAD(&peer->ibp_list);     /* not in the peer table yet */
 351         CFS_INIT_LIST_HEAD(&peer->ibp_conns);
 352         CFS_INIT_LIST_HEAD(&peer->ibp_tx_queue);
 353
 354         cfs_write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 355
 356         /* always called with a ref on ni, which prevents ni being shutdown */
 357         LASSERT (net->ibn_shutdown == 0);
 358
 359         /* npeers only grows with the global lock held */
 360         cfs_atomic_inc(&net->ibn_npeers);
 361
 362         cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 363
 364         *peerp = peer;
 365         return 0;
 366 }
 367
 368 void
 369 kiblnd_destroy_peer (kib_peer_t *peer)
 370 {
 371         kib_net_t *net = peer->ibp_ni->ni_data;
 372
 373         LASSERT (net != NULL);
 374         LASSERT (cfs_atomic_read(&peer->ibp_refcount) == 0);
 375         LASSERT (!kiblnd_peer_active(peer));
 376         LASSERT (peer->ibp_connecting == 0);
 377         LASSERT (peer->ibp_accepting == 0);
 378         LASSERT (cfs_list_empty(&peer->ibp_conns));
 379         LASSERT (cfs_list_empty(&peer->ibp_tx_queue));
 380
 381         LIBCFS_FREE(peer, sizeof(*peer));
 382
 383         /* NB a peer's connections keep a reference on their peer until
 384          * they are destroyed, so we can be assured that _all_ state to do
 385          * with this peer has been cleaned up when its refcount drops to
 386          * zero. */
 387         cfs_atomic_dec(&net->ibn_npeers);
 388 }
 389
 390 kib_peer_t *
 391 kiblnd_find_peer_locked (lnet_nid_t nid)
 392 {
 393         /* the caller is responsible for accounting the additional reference
 394          * that this creates */
 395         cfs_list_t       *peer_list = kiblnd_nid2peerlist(nid);
 396         cfs_list_t       *tmp;
 397         kib_peer_t       *peer;
 398
 399         cfs_list_for_each (tmp, peer_list) {
 400
 401                 peer = cfs_list_entry(tmp, kib_peer_t, ibp_list);
 402
 403                 LASSERT (peer->ibp_connecting > 0 || /* creating conns */
 404                          peer->ibp_accepting > 0 ||
 405                          !cfs_list_empty(&peer->ibp_conns));  /* active conn */
 406
 407                 if (peer->ibp_nid != nid)
 408                         continue;
 409
 410                 CDEBUG(D_NET, "got peer [%p] -> %s (%d) version: %x\n",
 411                        peer, libcfs_nid2str(nid),
 412                        cfs_atomic_read(&peer->ibp_refcount),
 413                        peer->ibp_version);
 414                 return peer;
 415         }
 416         return NULL;
 417 }
 418
 419 void
 420 kiblnd_unlink_peer_locked (kib_peer_t *peer)
 421 {
 422         LASSERT (cfs_list_empty(&peer->ibp_conns));
 423
 424         LASSERT (kiblnd_peer_active(peer));
 425         cfs_list_del_init(&peer->ibp_list);
 426         /* lose peerlist's ref */
 427         kiblnd_peer_decref(peer);
 428 }
 429
 430 int
 431 kiblnd_get_peer_info (lnet_ni_t *ni, int index,
 432                       lnet_nid_t *nidp, int *count)
 433 {
 434         kib_peer_t            *peer;
 435         cfs_list_t            *ptmp;
 436         int                    i;
 437         unsigned long          flags;
 438
 439         cfs_read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 440
 441         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
 442
 443                 cfs_list_for_each (ptmp, &kiblnd_data.kib_peers[i]) {
 444
 445                         peer = cfs_list_entry(ptmp, kib_peer_t, ibp_list);
 446                         LASSERT (peer->ibp_connecting > 0 ||
 447                                  peer->ibp_accepting > 0 ||
 448                                  !cfs_list_empty(&peer->ibp_conns));
 449
 450                         if (peer->ibp_ni != ni)
 451                                 continue;
 452
 453                         if (index-- > 0)
 454                                 continue;
 455
 456                         *nidp = peer->ibp_nid;
 457                         *count = cfs_atomic_read(&peer->ibp_refcount);
 458
 459                         cfs_read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
 460                                                    flags);
 461                         return 0;
 462                 }
 463         }
 464
 465         cfs_read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 466         return -ENOENT;
 467 }
 468
 469 void
 470 kiblnd_del_peer_locked (kib_peer_t *peer)
 471 {
 472         cfs_list_t           *ctmp;
 473         cfs_list_t           *cnxt;
 474         kib_conn_t           *conn;
 475
 476         if (cfs_list_empty(&peer->ibp_conns)) {
 477                 kiblnd_unlink_peer_locked(peer);
 478         } else {
 479                 cfs_list_for_each_safe (ctmp, cnxt, &peer->ibp_conns) {
 480                         conn = cfs_list_entry(ctmp, kib_conn_t, ibc_list);
 481
 482                         kiblnd_close_conn_locked(conn, 0);
 483                 }
 484                 /* NB closing peer's last conn unlinked it. */
 485         }
 486         /* NB peer now unlinked; might even be freed if the peer table had the
 487          * last ref on it. */
 488 }
 489
 490 int
 491 kiblnd_del_peer (lnet_ni_t *ni, lnet_nid_t nid)
 492 {
 493         CFS_LIST_HEAD         (zombies);
 494         cfs_list_t            *ptmp;
 495         cfs_list_t            *pnxt;
 496         kib_peer_t            *peer;
 497         int                    lo;
 498         int                    hi;
 499         int                    i;
 500         unsigned long          flags;
 501         int                    rc = -ENOENT;
 502
 503         cfs_write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 504
 505         if (nid != LNET_NID_ANY) {
 506                 lo = hi = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
 507         } else {
 508                 lo = 0;
 509                 hi = kiblnd_data.kib_peer_hash_size - 1;
 510         }
 511
 512         for (i = lo; i <= hi; i++) {
 513                 cfs_list_for_each_safe (ptmp, pnxt, &kiblnd_data.kib_peers[i]) {
 514                         peer = cfs_list_entry(ptmp, kib_peer_t, ibp_list);
 515                         LASSERT (peer->ibp_connecting > 0 ||
 516                                  peer->ibp_accepting > 0 ||
 517                                  !cfs_list_empty(&peer->ibp_conns));
 518
 519                         if (peer->ibp_ni != ni)
 520                                 continue;
 521
 522                         if (!(nid == LNET_NID_ANY || peer->ibp_nid == nid))
 523                                 continue;
 524
 525                         if (!cfs_list_empty(&peer->ibp_tx_queue)) {
 526                                 LASSERT (cfs_list_empty(&peer->ibp_conns));
 527
 528                                 cfs_list_splice_init(&peer->ibp_tx_queue,
 529                                                      &zombies);
 530                         }
 531
 532                         kiblnd_del_peer_locked(peer);
 533                         rc = 0;         /* matched something */
 534                 }
 535         }
 536
 537         cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 538
 539         kiblnd_txlist_done(ni, &zombies, -EIO);
 540
 541         return rc;
 542 }
 543
 544 kib_conn_t *
 545 kiblnd_get_conn_by_idx (lnet_ni_t *ni, int index)
 546 {
 547         kib_peer_t            *peer;
 548         cfs_list_t            *ptmp;
 549         kib_conn_t            *conn;
 550         cfs_list_t            *ctmp;
 551         int                    i;
 552         unsigned long          flags;
 553
 554         cfs_read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 555
 556         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
 557                 cfs_list_for_each (ptmp, &kiblnd_data.kib_peers[i]) {
 558
 559                         peer = cfs_list_entry(ptmp, kib_peer_t, ibp_list);
 560                         LASSERT (peer->ibp_connecting > 0 ||
 561                                  peer->ibp_accepting > 0 ||
 562                                  !cfs_list_empty(&peer->ibp_conns));
 563
 564                         if (peer->ibp_ni != ni)
 565                                 continue;
 566
 567                         cfs_list_for_each (ctmp, &peer->ibp_conns) {
 568                                 if (index-- > 0)
 569                                         continue;
 570
 571                                 conn = cfs_list_entry(ctmp, kib_conn_t,
 572                                                       ibc_list);
 573                                 kiblnd_conn_addref(conn);
 574                                 cfs_read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
 575                                                            flags);
 576                                 return conn;
 577                         }
 578                 }
 579         }
 580
 581         cfs_read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 582         return NULL;
 583 }
 584
 585 void
 586 kiblnd_debug_rx (kib_rx_t *rx)
 587 {
 588         CDEBUG(D_CONSOLE, "      %p status %d msg_type %x cred %d\n",
 589                rx, rx->rx_status, rx->rx_msg->ibm_type,
 590                rx->rx_msg->ibm_credits);
 591 }
 592
 593 void
 594 kiblnd_debug_tx (kib_tx_t *tx)
 595 {
 596         CDEBUG(D_CONSOLE, "      %p snd %d q %d w %d rc %d dl %lx "
 597                "cookie "LPX64" msg %s%s type %x cred %d\n",
 598                tx, tx->tx_sending, tx->tx_queued, tx->tx_waiting,
 599                tx->tx_status, tx->tx_deadline, tx->tx_cookie,
 600                tx->tx_lntmsg[0] == NULL ? "-" : "!",
 601                tx->tx_lntmsg[1] == NULL ? "-" : "!",
 602                tx->tx_msg->ibm_type, tx->tx_msg->ibm_credits);
 603 }
 604
 605 void
 606 kiblnd_debug_conn (kib_conn_t *conn)
 607 {
 608         cfs_list_t           *tmp;
 609         int                   i;
 610
 611         cfs_spin_lock(&conn->ibc_lock);
 612
 613         CDEBUG(D_CONSOLE, "conn[%d] %p [version %x] -> %s: \n",
 614                cfs_atomic_read(&conn->ibc_refcount), conn,
 615                conn->ibc_version, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 616         CDEBUG(D_CONSOLE, "   state %d nposted %d/%d cred %d o_cred %d r_cred %d\n",
 617                conn->ibc_state, conn->ibc_noops_posted,
 618                conn->ibc_nsends_posted, conn->ibc_credits,
 619                conn->ibc_outstanding_credits, conn->ibc_reserved_credits);
 620         CDEBUG(D_CONSOLE, "   comms_err %d\n", conn->ibc_comms_error);
 621
 622         CDEBUG(D_CONSOLE, "   early_rxs:\n");
 623         cfs_list_for_each(tmp, &conn->ibc_early_rxs)
 624                 kiblnd_debug_rx(cfs_list_entry(tmp, kib_rx_t, rx_list));
 625
 626         CDEBUG(D_CONSOLE, "   tx_noops:\n");
 627         cfs_list_for_each(tmp, &conn->ibc_tx_noops)
 628                 kiblnd_debug_tx(cfs_list_entry(tmp, kib_tx_t, tx_list));
 629
 630         CDEBUG(D_CONSOLE, "   tx_queue_nocred:\n");
 631         cfs_list_for_each(tmp, &conn->ibc_tx_queue_nocred)
 632                 kiblnd_debug_tx(cfs_list_entry(tmp, kib_tx_t, tx_list));
 633
 634         CDEBUG(D_CONSOLE, "   tx_queue_rsrvd:\n");
 635         cfs_list_for_each(tmp, &conn->ibc_tx_queue_rsrvd)
 636                 kiblnd_debug_tx(cfs_list_entry(tmp, kib_tx_t, tx_list));
 637
 638         CDEBUG(D_CONSOLE, "   tx_queue:\n");
 639         cfs_list_for_each(tmp, &conn->ibc_tx_queue)
 640                 kiblnd_debug_tx(cfs_list_entry(tmp, kib_tx_t, tx_list));
 641
 642         CDEBUG(D_CONSOLE, "   active_txs:\n");
 643         cfs_list_for_each(tmp, &conn->ibc_active_txs)
 644                 kiblnd_debug_tx(cfs_list_entry(tmp, kib_tx_t, tx_list));
 645
 646         CDEBUG(D_CONSOLE, "   rxs:\n");
 647         for (i = 0; i < IBLND_RX_MSGS(conn->ibc_version); i++)
 648                 kiblnd_debug_rx(&conn->ibc_rxs[i]);
 649
 650         cfs_spin_unlock(&conn->ibc_lock);
 651 }
 652
 653 int
 654 kiblnd_translate_mtu(int value)
 655 {
 656         switch (value) {
 657         default:
 658                 return -1;
 659         case 0:
 660                 return 0;
 661         case 256:
 662                 return IB_MTU_256;
 663         case 512:
 664                 return IB_MTU_512;
 665         case 1024:
 666                 return IB_MTU_1024;
 667         case 2048:
 668                 return IB_MTU_2048;
 669         case 4096:
 670                 return IB_MTU_4096;
 671         }
 672 }
 673
 674 static void
 675 kiblnd_setup_mtu_locked(struct rdma_cm_id *cmid)
 676 {
 677         int           mtu;
 678
 679         /* XXX There is no path record for iWARP, set by netdev->change_mtu? */
 680         if (cmid->route.path_rec == NULL)
 681                 return;
 682
 683         mtu = kiblnd_translate_mtu(*kiblnd_tunables.kib_ib_mtu);
 684         LASSERT (mtu >= 0);
 685         if (mtu != 0)
 686                 cmid->route.path_rec->mtu = mtu;
 687 }
 688
 689 kib_conn_t *
 690 kiblnd_create_conn(kib_peer_t *peer, struct rdma_cm_id *cmid,
 691                    int state, int version)
 692 {
 693         /* CAVEAT EMPTOR:
 694          * If the new conn is created successfully it takes over the caller's
 695          * ref on 'peer'.  It also "owns" 'cmid' and destroys it when it itself
 696          * is destroyed.  On failure, the caller's ref on 'peer' remains and
 697          * she must dispose of 'cmid'.  (Actually I'd block forever if I tried
 698          * to destroy 'cmid' here since I'm called from the CM which still has
 699          * its ref on 'cmid'). */
 700         cfs_rwlock_t           *glock = &kiblnd_data.kib_global_lock;
 701         kib_net_t              *net = peer->ibp_ni->ni_data;
 702         kib_dev_t              *dev = net->ibn_dev;
 703         struct ib_qp_init_attr *init_qp_attr;
 704         kib_conn_t             *conn;
 705         struct ib_cq           *cq;
 706         unsigned long           flags;
 707         int                     rc;
 708         int                     i;
 709
 710         LASSERT (net != NULL);
 711         LASSERT (!cfs_in_interrupt());
 712
 713         LIBCFS_ALLOC(init_qp_attr, sizeof(*init_qp_attr));
 714         if (init_qp_attr == NULL) {
 715                 CERROR("Can't allocate qp_attr for %s\n",
 716                        libcfs_nid2str(peer->ibp_nid));
 717                 goto failed_0;
 718         }
 719
 720         LIBCFS_ALLOC(conn, sizeof(*conn));
 721         if (conn == NULL) {
 722                 CERROR("Can't allocate connection for %s\n",
 723                        libcfs_nid2str(peer->ibp_nid));
 724                 goto failed_1;
 725         }
 726
 727         memset(conn, 0, sizeof(*conn)); /* zero flags, NULL pointers etc... */
 728
 729         conn->ibc_state = IBLND_CONN_INIT;
 730         conn->ibc_version = version;
 731         conn->ibc_peer = peer;                  /* I take the caller's ref */
 732         cmid->context = conn;                   /* for future CM callbacks */
 733         conn->ibc_cmid = cmid;
 734
 735         CFS_INIT_LIST_HEAD(&conn->ibc_early_rxs);
 736         CFS_INIT_LIST_HEAD(&conn->ibc_tx_noops);
 737         CFS_INIT_LIST_HEAD(&conn->ibc_tx_queue);
 738         CFS_INIT_LIST_HEAD(&conn->ibc_tx_queue_rsrvd);
 739         CFS_INIT_LIST_HEAD(&conn->ibc_tx_queue_nocred);
 740         CFS_INIT_LIST_HEAD(&conn->ibc_active_txs);
 741         cfs_spin_lock_init(&conn->ibc_lock);
 742
 743         LIBCFS_ALLOC(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
 744         if (conn->ibc_connvars == NULL) {
 745                 CERROR("Can't allocate in-progress connection state\n");
 746                 goto failed_2;
 747         }
 748         memset(conn->ibc_connvars, 0, sizeof(*conn->ibc_connvars));
 749
 750         cfs_write_lock_irqsave(glock, flags);
 751         if (dev->ibd_failover) {
 752                 cfs_write_unlock_irqrestore(glock, flags);
 753                 CERROR("%s: failover in progress\n", dev->ibd_ifname);
 754                 goto failed_2;
 755         }
 756
 757         if (dev->ibd_hdev->ibh_ibdev != cmid->device) {
 758                 /* wakeup failover thread and teardown connection */
 759                 if (kiblnd_dev_can_failover(dev)) {
 760                         cfs_list_add_tail(&dev->ibd_fail_list,
 761                                       &kiblnd_data.kib_failed_devs);
 762                         cfs_waitq_signal(&kiblnd_data.kib_failover_waitq);
 763                 }
 764
 765                 cfs_write_unlock_irqrestore(glock, flags);
 766                 CERROR("cmid HCA(%s), kib_dev(%s) need failover\n",
 767                        cmid->device->name, dev->ibd_ifname);
 768                 goto failed_2;
 769         }
 770
 771         kiblnd_hdev_addref_locked(dev->ibd_hdev);
 772         conn->ibc_hdev = dev->ibd_hdev;
 773
 774         kiblnd_setup_mtu_locked(cmid);
 775
 776         cfs_write_unlock_irqrestore(glock, flags);
 777
 778         LIBCFS_ALLOC(conn->ibc_rxs, IBLND_RX_MSGS(version) * sizeof(kib_rx_t));
 779         if (conn->ibc_rxs == NULL) {
 780                 CERROR("Cannot allocate RX buffers\n");
 781                 goto failed_2;
 782         }
 783         memset(conn->ibc_rxs, 0, IBLND_RX_MSGS(version) * sizeof(kib_rx_t));
 784
 785         rc = kiblnd_alloc_pages(&conn->ibc_rx_pages,
 786                                 IBLND_RX_MSG_PAGES(version));
 787         if (rc != 0)
 788                 goto failed_2;
 789
 790         kiblnd_map_rx_descs(conn);
 791
 792 #ifdef HAVE_OFED_IB_COMP_VECTOR
 793         cq = ib_create_cq(cmid->device,
 794                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 795                           IBLND_CQ_ENTRIES(version), 0);
 796 #else
 797         cq = ib_create_cq(cmid->device,
 798                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 799                           IBLND_CQ_ENTRIES(version));
 800 #endif
 801         if (IS_ERR(cq)) {
 802                 CERROR("Can't create CQ: %ld, cqe: %d\n",
 803                        PTR_ERR(cq), IBLND_CQ_ENTRIES(version));
 804                 goto failed_2;
 805         }
 806
 807         conn->ibc_cq = cq;
 808
 809         rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 810         if (rc != 0) {
 811                 CERROR("Can't request completion notificiation: %d\n", rc);
 812                 goto failed_2;
 813         }
 814
 815         memset(init_qp_attr, 0, sizeof(*init_qp_attr));
 816         init_qp_attr->event_handler = kiblnd_qp_event;
 817         init_qp_attr->qp_context = conn;
 818         init_qp_attr->cap.max_send_wr = IBLND_SEND_WRS(version);
 819         init_qp_attr->cap.max_recv_wr = IBLND_RECV_WRS(version);
 820         init_qp_attr->cap.max_send_sge = 1;
 821         init_qp_attr->cap.max_recv_sge = 1;
 822         init_qp_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
 823         init_qp_attr->qp_type = IB_QPT_RC;
 824         init_qp_attr->send_cq = cq;
 825         init_qp_attr->recv_cq = cq;
 826
 827         rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd, init_qp_attr);
 828         if (rc != 0) {
 829                 CERROR("Can't create QP: %d, send_wr: %d, recv_wr: %d\n",
 830                        rc, init_qp_attr->cap.max_send_wr,
 831                        init_qp_attr->cap.max_recv_wr);
 832                 goto failed_2;
 833         }
 834
 835         LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
 836
 837         /* 1 ref for caller and each rxmsg */
 838         cfs_atomic_set(&conn->ibc_refcount, 1 + IBLND_RX_MSGS(version));
 839         conn->ibc_nrx = IBLND_RX_MSGS(version);
 840
 841         /* post receives */
 842         for (i = 0; i < IBLND_RX_MSGS(version); i++) {
 843                 rc = kiblnd_post_rx(&conn->ibc_rxs[i],
 844                                     IBLND_POSTRX_NO_CREDIT);
 845                 if (rc != 0) {
 846                         CERROR("Can't post rxmsg: %d\n", rc);
 847
 848                         /* Make posted receives complete */
 849                         kiblnd_abort_receives(conn);
 850
 851                         /* correct # of posted buffers
 852                          * NB locking needed now I'm racing with completion */
 853                         cfs_spin_lock_irqsave(&kiblnd_data.kib_sched_lock,
 854                                               flags);
 855                         conn->ibc_nrx -= IBLND_RX_MSGS(version) - i;
 856                         cfs_spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock,
 857                                                    flags);
 858
 859                         /* cmid will be destroyed by CM(ofed) after cm_callback
 860                          * returned, so we can't refer it anymore
 861                          * (by kiblnd_connd()->kiblnd_destroy_conn) */
 862                         rdma_destroy_qp(conn->ibc_cmid);
 863                         conn->ibc_cmid = NULL;
 864
 865                         /* Drop my own and unused rxbuffer refcounts */
 866                         while (i++ <= IBLND_RX_MSGS(version))
 867                                 kiblnd_conn_decref(conn);
 868
 869                         return NULL;
 870                 }
 871         }
 872
 873         /* Init successful! */
 874         LASSERT (state == IBLND_CONN_ACTIVE_CONNECT ||
 875                  state == IBLND_CONN_PASSIVE_WAIT);
 876         conn->ibc_state = state;
 877
 878         /* 1 more conn */
 879         cfs_atomic_inc(&net->ibn_nconns);
 880         return conn;
 881
 882  failed_2:
 883         kiblnd_destroy_conn(conn);
 884  failed_1:
 885         LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
 886  failed_0:
 887         return NULL;
 888 }
 889
 890 void
 891 kiblnd_destroy_conn (kib_conn_t *conn)
 892 {
 893         struct rdma_cm_id *cmid = conn->ibc_cmid;
 894         kib_peer_t        *peer = conn->ibc_peer;
 895         int                rc;
 896
 897         LASSERT (!cfs_in_interrupt());
 898         LASSERT (cfs_atomic_read(&conn->ibc_refcount) == 0);
 899         LASSERT (cfs_list_empty(&conn->ibc_early_rxs));
 900         LASSERT (cfs_list_empty(&conn->ibc_tx_noops));
 901         LASSERT (cfs_list_empty(&conn->ibc_tx_queue));
 902         LASSERT (cfs_list_empty(&conn->ibc_tx_queue_rsrvd));
 903         LASSERT (cfs_list_empty(&conn->ibc_tx_queue_nocred));
 904         LASSERT (cfs_list_empty(&conn->ibc_active_txs));
 905         LASSERT (conn->ibc_noops_posted == 0);
 906         LASSERT (conn->ibc_nsends_posted == 0);
 907
 908         switch (conn->ibc_state) {
 909         default:
 910                 /* conn must be completely disengaged from the network */
 911                 LBUG();
 912
 913         case IBLND_CONN_DISCONNECTED:
 914                 /* connvars should have been freed already */
 915                 LASSERT (conn->ibc_connvars == NULL);
 916                 break;
 917
 918         case IBLND_CONN_INIT:
 919                 break;
 920         }
 921
 922         /* conn->ibc_cmid might be destroyed by CM already */
 923         if (cmid != NULL && cmid->qp != NULL)
 924                 rdma_destroy_qp(cmid);
 925
 926         if (conn->ibc_cq != NULL) {
 927                 rc = ib_destroy_cq(conn->ibc_cq);
 928                 if (rc != 0)
 929                         CWARN("Error destroying CQ: %d\n", rc);
 930         }
 931
 932         if (conn->ibc_rx_pages != NULL)
 933                 kiblnd_unmap_rx_descs(conn);
 934
 935         if (conn->ibc_rxs != NULL) {
 936                 LIBCFS_FREE(conn->ibc_rxs,
 937                             IBLND_RX_MSGS(conn->ibc_version) * sizeof(kib_rx_t));
 938         }
 939
 940         if (conn->ibc_connvars != NULL)
 941                 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
 942
 943         if (conn->ibc_hdev != NULL)
 944                 kiblnd_hdev_decref(conn->ibc_hdev);
 945
 946         /* See CAVEAT EMPTOR above in kiblnd_create_conn */
 947         if (conn->ibc_state != IBLND_CONN_INIT) {
 948                 kib_net_t *net = peer->ibp_ni->ni_data;
 949
 950                 kiblnd_peer_decref(peer);
 951                 rdma_destroy_id(cmid);
 952                 cfs_atomic_dec(&net->ibn_nconns);
 953         }
 954
 955         LIBCFS_FREE(conn, sizeof(*conn));
 956 }
 957
 958 int
 959 kiblnd_close_peer_conns_locked (kib_peer_t *peer, int why)
 960 {
 961         kib_conn_t             *conn;
 962         cfs_list_t             *ctmp;
 963         cfs_list_t             *cnxt;
 964         int                     count = 0;
 965
 966         cfs_list_for_each_safe (ctmp, cnxt, &peer->ibp_conns) {
 967                 conn = cfs_list_entry(ctmp, kib_conn_t, ibc_list);
 968
 969                 CDEBUG(D_NET, "Closing conn -> %s, "
 970                               "version: %x, reason: %d\n",
 971                        libcfs_nid2str(peer->ibp_nid),
 972                        conn->ibc_version, why);
 973
 974                 kiblnd_close_conn_locked(conn, why);
 975                 count++;
 976         }
 977
 978         return count;
 979 }
 980
 981 int
 982 kiblnd_close_stale_conns_locked (kib_peer_t *peer,
 983                                  int version, __u64 incarnation)
 984 {
 985         kib_conn_t             *conn;
 986         cfs_list_t             *ctmp;
 987         cfs_list_t             *cnxt;
 988         int                     count = 0;
 989
 990         cfs_list_for_each_safe (ctmp, cnxt, &peer->ibp_conns) {
 991                 conn = cfs_list_entry(ctmp, kib_conn_t, ibc_list);
 992
 993                 if (conn->ibc_version     == version &&
 994                     conn->ibc_incarnation == incarnation)
 995                         continue;
 996
 997                 CDEBUG(D_NET, "Closing stale conn -> %s version: %x, "
 998                               "incarnation:"LPX64"(%x, "LPX64")\n",
 999                        libcfs_nid2str(peer->ibp_nid),
1000                        conn->ibc_version, conn->ibc_incarnation,
1001                        version, incarnation);
1002
1003                 kiblnd_close_conn_locked(conn, -ESTALE);
1004                 count++;
1005         }
1006
1007         return count;
1008 }
1009
1010 int
1011 kiblnd_close_matching_conns (lnet_ni_t *ni, lnet_nid_t nid)
1012 {
1013         kib_peer_t             *peer;
1014         cfs_list_t             *ptmp;
1015         cfs_list_t             *pnxt;
1016         int                     lo;
1017         int                     hi;
1018         int                     i;
1019         unsigned long           flags;
1020         int                     count = 0;
1021
1022         cfs_write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1023
1024         if (nid != LNET_NID_ANY)
1025                 lo = hi = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
1026         else {
1027                 lo = 0;
1028                 hi = kiblnd_data.kib_peer_hash_size - 1;
1029         }
1030
1031         for (i = lo; i <= hi; i++) {
1032                 cfs_list_for_each_safe (ptmp, pnxt, &kiblnd_data.kib_peers[i]) {
1033
1034                         peer = cfs_list_entry(ptmp, kib_peer_t, ibp_list);
1035                         LASSERT (peer->ibp_connecting > 0 ||
1036                                  peer->ibp_accepting > 0 ||
1037                                  !cfs_list_empty(&peer->ibp_conns));
1038
1039                         if (peer->ibp_ni != ni)
1040                                 continue;
1041
1042                         if (!(nid == LNET_NID_ANY || nid == peer->ibp_nid))
1043                                 continue;
1044
1045                         count += kiblnd_close_peer_conns_locked(peer, 0);
1046                 }
1047         }
1048
1049         cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1050
1051         /* wildcards always succeed */
1052         if (nid == LNET_NID_ANY)
1053                 return 0;
1054
1055         return (count == 0) ? -ENOENT : 0;
1056 }
1057
1058 int
1059 kiblnd_ctl(lnet_ni_t *ni, unsigned int cmd, void *arg)
1060 {
1061         struct libcfs_ioctl_data *data = arg;
1062         int                       rc = -EINVAL;
1063
1064         switch(cmd) {
1065         case IOC_LIBCFS_GET_PEER: {
1066                 lnet_nid_t   nid = 0;
1067                 int          count = 0;
1068
1069                 rc = kiblnd_get_peer_info(ni, data->ioc_count,
1070                                           &nid, &count);
1071                 data->ioc_nid    = nid;
1072                 data->ioc_count  = count;
1073                 break;
1074         }
1075
1076         case IOC_LIBCFS_DEL_PEER: {
1077                 rc = kiblnd_del_peer(ni, data->ioc_nid);
1078                 break;
1079         }
1080         case IOC_LIBCFS_GET_CONN: {
1081                 kib_conn_t *conn;
1082
1083                 rc = 0;
1084                 conn = kiblnd_get_conn_by_idx(ni, data->ioc_count);
1085                 if (conn == NULL) {
1086                         rc = -ENOENT;
1087                         break;
1088                 }
1089
1090                 LASSERT (conn->ibc_cmid != NULL);
1091                 data->ioc_nid = conn->ibc_peer->ibp_nid;
1092                 if (conn->ibc_cmid->route.path_rec == NULL)
1093                         data->ioc_u32[0] = 0; /* iWarp has no path MTU */
1094                 else
1095                         data->ioc_u32[0] =
1096                         ib_mtu_enum_to_int(conn->ibc_cmid->route.path_rec->mtu);
1097                 kiblnd_conn_decref(conn);
1098                 break;
1099         }
1100         case IOC_LIBCFS_CLOSE_CONNECTION: {
1101                 rc = kiblnd_close_matching_conns(ni, data->ioc_nid);
1102                 break;
1103         }
1104
1105         default:
1106                 break;
1107         }
1108
1109         return rc;
1110 }
1111
1112 void
1113 kiblnd_query (lnet_ni_t *ni, lnet_nid_t nid, cfs_time_t *when)
1114 {
1115         cfs_time_t         last_alive = 0;
1116         cfs_time_t         now = cfs_time_current();
1117         cfs_rwlock_t      *glock = &kiblnd_data.kib_global_lock;
1118         kib_peer_t        *peer;
1119         unsigned long      flags;
1120
1121         cfs_read_lock_irqsave(glock, flags);
1122
1123         peer = kiblnd_find_peer_locked(nid);
1124         if (peer != NULL) {
1125                 LASSERT (peer->ibp_connecting > 0 || /* creating conns */
1126                          peer->ibp_accepting > 0 ||
1127                          !cfs_list_empty(&peer->ibp_conns));  /* active conn */
1128                 last_alive = peer->ibp_last_alive;
1129         }
1130
1131         cfs_read_unlock_irqrestore(glock, flags);
1132
1133         if (last_alive != 0)
1134                 *when = last_alive;
1135
1136         /* peer is not persistent in hash, trigger peer creation
1137          * and connection establishment with a NULL tx */
1138         if (peer == NULL)
1139                 kiblnd_launch_tx(ni, NULL, nid);
1140
1141         CDEBUG(D_NET, "Peer %s %p, alive %ld secs ago\n",
1142                libcfs_nid2str(nid), peer,
1143                last_alive ? cfs_duration_sec(now - last_alive) : -1);
1144         return;
1145 }
1146
1147 void
1148 kiblnd_free_pages (kib_pages_t *p)
1149 {
1150         int         npages = p->ibp_npages;
1151         int         i;
1152
1153         for (i = 0; i < npages; i++)
1154                 if (p->ibp_pages[i] != NULL)
1155                         __free_page(p->ibp_pages[i]);
1156
1157         LIBCFS_FREE (p, offsetof(kib_pages_t, ibp_pages[npages]));
1158 }
1159
1160 int
1161 kiblnd_alloc_pages (kib_pages_t **pp, int npages)
1162 {
1163         kib_pages_t   *p;
1164         int            i;
1165
1166         LIBCFS_ALLOC(p, offsetof(kib_pages_t, ibp_pages[npages]));
1167         if (p == NULL) {
1168                 CERROR("Can't allocate descriptor for %d pages\n", npages);
1169                 return -ENOMEM;
1170         }
1171
1172         memset(p, 0, offsetof(kib_pages_t, ibp_pages[npages]));
1173         p->ibp_npages = npages;
1174
1175         for (i = 0; i < npages; i++) {
1176                 p->ibp_pages[i] = alloc_page(GFP_KERNEL);
1177                 if (p->ibp_pages[i] == NULL) {
1178                         CERROR("Can't allocate page %d of %d\n", i, npages);
1179                         kiblnd_free_pages(p);
1180                         return -ENOMEM;
1181                 }
1182         }
1183
1184         *pp = p;
1185         return 0;
1186 }
1187
1188 void
1189 kiblnd_unmap_rx_descs(kib_conn_t *conn)
1190 {
1191         kib_rx_t *rx;
1192         int       i;
1193
1194         LASSERT (conn->ibc_rxs != NULL);
1195         LASSERT (conn->ibc_hdev != NULL);
1196
1197         for (i = 0; i < IBLND_RX_MSGS(conn->ibc_version); i++) {
1198                 rx = &conn->ibc_rxs[i];
1199
1200                 LASSERT (rx->rx_nob >= 0); /* not posted */
1201
1202                 kiblnd_dma_unmap_single(conn->ibc_hdev->ibh_ibdev,
1203                                         KIBLND_UNMAP_ADDR(rx, rx_msgunmap,
1204                                                           rx->rx_msgaddr),
1205                                         IBLND_MSG_SIZE, DMA_FROM_DEVICE);
1206         }
1207
1208         kiblnd_free_pages(conn->ibc_rx_pages);
1209
1210         conn->ibc_rx_pages = NULL;
1211 }
1212
1213 void
1214 kiblnd_map_rx_descs(kib_conn_t *conn)
1215 {
1216         kib_rx_t       *rx;
1217         struct page    *pg;
1218         int             pg_off;
1219         int             ipg;
1220         int             i;
1221
1222         for (pg_off = ipg = i = 0;
1223              i < IBLND_RX_MSGS(conn->ibc_version); i++) {
1224                 pg = conn->ibc_rx_pages->ibp_pages[ipg];
1225                 rx = &conn->ibc_rxs[i];
1226
1227                 rx->rx_conn = conn;
1228                 rx->rx_msg = (kib_msg_t *)(((char *)page_address(pg)) + pg_off);
1229
1230                 rx->rx_msgaddr = kiblnd_dma_map_single(conn->ibc_hdev->ibh_ibdev,
1231                                                        rx->rx_msg, IBLND_MSG_SIZE,
1232                                                        DMA_FROM_DEVICE);
1233                 LASSERT (!kiblnd_dma_mapping_error(conn->ibc_hdev->ibh_ibdev,
1234                                                    rx->rx_msgaddr));
1235                 KIBLND_UNMAP_ADDR_SET(rx, rx_msgunmap, rx->rx_msgaddr);
1236
1237                 CDEBUG(D_NET,"rx %d: %p "LPX64"("LPX64")\n",
1238                        i, rx->rx_msg, rx->rx_msgaddr,
1239                        lnet_page2phys(pg) + pg_off);
1240
1241                 pg_off += IBLND_MSG_SIZE;
1242                 LASSERT (pg_off <= PAGE_SIZE);
1243
1244                 if (pg_off == PAGE_SIZE) {
1245                         pg_off = 0;
1246                         ipg++;
1247                         LASSERT (ipg <= IBLND_RX_MSG_PAGES(conn->ibc_version));
1248                 }
1249         }
1250 }
1251
1252 static void
1253 kiblnd_unmap_tx_pool(kib_tx_pool_t *tpo)
1254 {
1255         kib_hca_dev_t  *hdev = tpo->tpo_hdev;
1256         kib_tx_t       *tx;
1257         int             i;
1258
1259         LASSERT (tpo->tpo_pool.po_allocated == 0);
1260
1261         if (hdev == NULL)
1262                 return;
1263
1264         for (i = 0; i < tpo->tpo_pool.po_size; i++) {
1265                 tx = &tpo->tpo_tx_descs[i];
1266                 kiblnd_dma_unmap_single(hdev->ibh_ibdev,
1267                                         KIBLND_UNMAP_ADDR(tx, tx_msgunmap,
1268                                                           tx->tx_msgaddr),
1269                                         IBLND_MSG_SIZE, DMA_TO_DEVICE);
1270         }
1271
1272         kiblnd_hdev_decref(hdev);
1273         tpo->tpo_hdev = NULL;
1274 }
1275
1276 static kib_hca_dev_t *
1277 kiblnd_current_hdev(kib_dev_t *dev)
1278 {
1279         kib_hca_dev_t *hdev;
1280         unsigned long  flags;
1281         int            i = 0;
1282
1283         cfs_read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1284         while (dev->ibd_failover) {
1285                 cfs_read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1286                 if (i++ % 50 == 0)
1287                         CDEBUG(D_NET, "Wait for dev(%s) failover\n", dev->ibd_ifname);
1288                 cfs_schedule_timeout(cfs_time_seconds(1) / 100);
1289
1290                 cfs_read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1291         }
1292
1293         kiblnd_hdev_addref_locked(dev->ibd_hdev);
1294         hdev = dev->ibd_hdev;
1295
1296         cfs_read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1297
1298         return hdev;
1299 }
1300
1301 static void
1302 kiblnd_map_tx_pool(kib_tx_pool_t *tpo)
1303 {
1304         kib_pages_t    *txpgs = tpo->tpo_tx_pages;
1305         kib_pool_t     *pool  = &tpo->tpo_pool;
1306         kib_net_t      *net   = pool->po_owner->ps_net;
1307         kib_dev_t      *dev   = net->ibn_dev;
1308         struct page    *page;
1309         kib_tx_t       *tx;
1310         int             page_offset;
1311         int             ipage;
1312         int             i;
1313
1314         LASSERT (net != NULL);
1315
1316         /* pre-mapped messages are not bigger than 1 page */
1317         CLASSERT (IBLND_MSG_SIZE <= PAGE_SIZE);
1318
1319         /* No fancy arithmetic when we do the buffer calculations */
1320         CLASSERT (PAGE_SIZE % IBLND_MSG_SIZE == 0);
1321
1322         tpo->tpo_hdev = kiblnd_current_hdev(dev);
1323
1324         for (ipage = page_offset = i = 0; i < pool->po_size; i++) {
1325                 page = txpgs->ibp_pages[ipage];
1326                 tx = &tpo->tpo_tx_descs[i];
1327
1328                 tx->tx_msg = (kib_msg_t *)(((char *)page_address(page)) +
1329                                            page_offset);
1330
1331                 tx->tx_msgaddr = kiblnd_dma_map_single(
1332                         tpo->tpo_hdev->ibh_ibdev, tx->tx_msg,
1333                         IBLND_MSG_SIZE, DMA_TO_DEVICE);
1334                 LASSERT (!kiblnd_dma_mapping_error(tpo->tpo_hdev->ibh_ibdev,
1335                                                    tx->tx_msgaddr));
1336                 KIBLND_UNMAP_ADDR_SET(tx, tx_msgunmap, tx->tx_msgaddr);
1337
1338                 cfs_list_add(&tx->tx_list, &pool->po_free_list);
1339
1340                 page_offset += IBLND_MSG_SIZE;
1341                 LASSERT (page_offset <= PAGE_SIZE);
1342
1343                 if (page_offset == PAGE_SIZE) {
1344                         page_offset = 0;
1345                         ipage++;
1346                         LASSERT (ipage <= txpgs->ibp_npages);
1347                 }
1348         }
1349 }
1350
1351 struct ib_mr *
1352 kiblnd_find_dma_mr(kib_hca_dev_t *hdev, __u64 addr, __u64 size)
1353 {
1354         __u64   index;
1355
1356         LASSERT (hdev->ibh_mrs[0] != NULL);
1357
1358         if (hdev->ibh_nmrs == 1)
1359                 return hdev->ibh_mrs[0];
1360
1361         index = addr >> hdev->ibh_mr_shift;
1362
1363         if (index <  hdev->ibh_nmrs &&
1364             index == ((addr + size - 1) >> hdev->ibh_mr_shift))
1365                 return hdev->ibh_mrs[index];
1366
1367         return NULL;
1368 }
1369
1370 struct ib_mr *
1371 kiblnd_find_rd_dma_mr(kib_hca_dev_t *hdev, kib_rdma_desc_t *rd)
1372 {
1373         struct ib_mr *prev_mr;
1374         struct ib_mr *mr;
1375         int           i;
1376
1377         LASSERT (hdev->ibh_mrs[0] != NULL);
1378
1379         if (*kiblnd_tunables.kib_map_on_demand > 0 &&
1380             *kiblnd_tunables.kib_map_on_demand <= rd->rd_nfrags)
1381                 return NULL;
1382
1383         if (hdev->ibh_nmrs == 1)
1384                 return hdev->ibh_mrs[0];
1385
1386         for (i = 0, mr = prev_mr = NULL;
1387              i < rd->rd_nfrags; i++) {
1388                 mr = kiblnd_find_dma_mr(hdev,
1389                                         rd->rd_frags[i].rf_addr,
1390                                         rd->rd_frags[i].rf_nob);
1391                 if (prev_mr == NULL)
1392                         prev_mr = mr;
1393
1394                 if (mr == NULL || prev_mr != mr) {
1395                         /* Can't covered by one single MR */
1396                         mr = NULL;
1397                         break;
1398                 }
1399         }
1400
1401         return mr;
1402 }
1403
1404 void
1405 kiblnd_destroy_fmr_pool(kib_fmr_pool_t *pool)
1406 {
1407         LASSERT (pool->fpo_map_count == 0);
1408
1409         if (pool->fpo_fmr_pool != NULL)
1410                 ib_destroy_fmr_pool(pool->fpo_fmr_pool);
1411
1412         if (pool->fpo_hdev != NULL)
1413                 kiblnd_hdev_decref(pool->fpo_hdev);
1414
1415         LIBCFS_FREE(pool, sizeof(kib_fmr_pool_t));
1416 }
1417
1418 void
1419 kiblnd_destroy_fmr_pool_list(cfs_list_t *head)
1420 {
1421         kib_fmr_pool_t *pool;
1422
1423         while (!cfs_list_empty(head)) {
1424                 pool = cfs_list_entry(head->next, kib_fmr_pool_t, fpo_list);
1425                 cfs_list_del(&pool->fpo_list);
1426                 kiblnd_destroy_fmr_pool(pool);
1427         }
1428 }
1429
1430 int
1431 kiblnd_create_fmr_pool(kib_fmr_poolset_t *fps, kib_fmr_pool_t **pp_fpo)
1432 {
1433         /* FMR pool for RDMA */
1434         kib_dev_t               *dev = fps->fps_net->ibn_dev;
1435         kib_fmr_pool_t          *fpo;
1436         struct ib_fmr_pool_param param = {
1437                 .max_pages_per_fmr = LNET_MAX_PAYLOAD/PAGE_SIZE,
1438                 .page_shift        = PAGE_SHIFT,
1439                 .access            = (IB_ACCESS_LOCAL_WRITE |
1440                                       IB_ACCESS_REMOTE_WRITE),
1441                 .pool_size         = *kiblnd_tunables.kib_fmr_pool_size,
1442                 .dirty_watermark   = *kiblnd_tunables.kib_fmr_flush_trigger,
1443                 .flush_function    = NULL,
1444                 .flush_arg         = NULL,
1445                 .cache             = !!*kiblnd_tunables.kib_fmr_cache};
1446         int rc;
1447
1448         LIBCFS_ALLOC(fpo, sizeof(kib_fmr_pool_t));
1449         if (fpo == NULL)
1450                 return -ENOMEM;
1451
1452         memset(fpo, 0, sizeof(kib_fmr_pool_t));
1453         fpo->fpo_hdev = kiblnd_current_hdev(dev);
1454         fpo->fpo_fmr_pool = ib_create_fmr_pool(fpo->fpo_hdev->ibh_pd, &param);
1455         if (IS_ERR(fpo->fpo_fmr_pool)) {
1456                 CERROR("Failed to create FMR pool: %ld\n",
1457                        PTR_ERR(fpo->fpo_fmr_pool));
1458                 rc = PTR_ERR(fpo->fpo_fmr_pool);
1459                 kiblnd_hdev_decref(fpo->fpo_hdev);
1460                 LIBCFS_FREE(fpo, sizeof(kib_fmr_pool_t));
1461                 return rc;
1462         }
1463
1464         fpo->fpo_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1465         fpo->fpo_owner    = fps;
1466         *pp_fpo = fpo;
1467
1468         return 0;
1469 }
1470
1471 static void
1472 kiblnd_fail_fmr_pool_set(kib_fmr_poolset_t *fps, cfs_list_t *zombies)
1473 {
1474         cfs_spin_lock(&fps->fps_lock);
1475
1476         while (!cfs_list_empty(&fps->fps_pool_list)) {
1477                 kib_fmr_pool_t *fpo = cfs_list_entry(fps->fps_pool_list.next,
1478                                                  kib_fmr_pool_t, fpo_list);
1479                 fpo->fpo_failed = 1;
1480                 cfs_list_del(&fpo->fpo_list);
1481                 if (fpo->fpo_map_count == 0)
1482                         cfs_list_add(&fpo->fpo_list, zombies);
1483                 else
1484                         cfs_list_add(&fpo->fpo_list, &fps->fps_failed_pool_list);
1485         }
1486
1487         cfs_spin_unlock(&fps->fps_lock);
1488 }
1489
1490 static void
1491 kiblnd_fini_fmr_pool_set(kib_fmr_poolset_t *fps)
1492 {
1493         kiblnd_destroy_fmr_pool_list(&fps->fps_failed_pool_list);
1494         kiblnd_destroy_fmr_pool_list(&fps->fps_pool_list);
1495 }
1496
1497 static int
1498 kiblnd_init_fmr_pool_set(kib_fmr_poolset_t *fps, kib_net_t *net)
1499 {
1500         kib_fmr_pool_t *fpo;
1501         int             rc;
1502
1503         memset(fps, 0, sizeof(kib_fmr_poolset_t));
1504
1505         fps->fps_net = net;
1506         cfs_spin_lock_init(&fps->fps_lock);
1507         CFS_INIT_LIST_HEAD(&fps->fps_pool_list);
1508         CFS_INIT_LIST_HEAD(&fps->fps_failed_pool_list);
1509         rc = kiblnd_create_fmr_pool(fps, &fpo);
1510         if (rc == 0)
1511                 cfs_list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1512
1513         return rc;
1514 }
1515
1516 static int
1517 kiblnd_fmr_pool_is_idle(kib_fmr_pool_t *fpo, cfs_time_t now)
1518 {
1519         if (fpo->fpo_map_count != 0) /* still in use */
1520                 return 0;
1521         if (fpo->fpo_failed)
1522                 return 1;
1523         return cfs_time_aftereq(now, fpo->fpo_deadline);
1524 }
1525
1526 void
1527 kiblnd_fmr_pool_unmap(kib_fmr_t *fmr, int status)
1528 {
1529         CFS_LIST_HEAD     (zombies);
1530         kib_fmr_pool_t    *fpo = fmr->fmr_pool;
1531         kib_fmr_poolset_t *fps = fpo->fpo_owner;
1532         cfs_time_t         now = cfs_time_current();
1533         kib_fmr_pool_t    *tmp;
1534         int                rc;
1535
1536         rc = ib_fmr_pool_unmap(fmr->fmr_pfmr);
1537         LASSERT (rc == 0);
1538
1539         if (status != 0) {
1540                 rc = ib_flush_fmr_pool(fpo->fpo_fmr_pool);
1541                 LASSERT (rc == 0);
1542         }
1543
1544         fmr->fmr_pool = NULL;
1545         fmr->fmr_pfmr = NULL;
1546
1547         cfs_spin_lock(&fps->fps_lock);
1548         fpo->fpo_map_count --;  /* decref the pool */
1549
1550         cfs_list_for_each_entry_safe(fpo, tmp, &fps->fps_pool_list, fpo_list) {
1551                 /* the first pool is persistent */
1552                 if (fps->fps_pool_list.next == &fpo->fpo_list)
1553                         continue;
1554
1555                 if (kiblnd_fmr_pool_is_idle(fpo, now)) {
1556                         cfs_list_move(&fpo->fpo_list, &zombies);
1557                         fps->fps_version ++;
1558                 }
1559         }
1560         cfs_spin_unlock(&fps->fps_lock);
1561
1562         if (!cfs_list_empty(&zombies))
1563                 kiblnd_destroy_fmr_pool_list(&zombies);
1564 }
1565
1566 int
1567 kiblnd_fmr_pool_map(kib_fmr_poolset_t *fps, __u64 *pages, int npages,
1568                     __u64 iov, kib_fmr_t *fmr)
1569 {
1570         struct ib_pool_fmr *pfmr;
1571         kib_fmr_pool_t     *fpo;
1572         __u64               version;
1573         int                 rc;
1574
1575         LASSERT (fps->fps_net->ibn_with_fmr);
1576  again:
1577         cfs_spin_lock(&fps->fps_lock);
1578         version = fps->fps_version;
1579         cfs_list_for_each_entry(fpo, &fps->fps_pool_list, fpo_list) {
1580                 fpo->fpo_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1581                 fpo->fpo_map_count ++;
1582                 cfs_spin_unlock(&fps->fps_lock);
1583
1584                 pfmr = ib_fmr_pool_map_phys(fpo->fpo_fmr_pool,
1585                                             pages, npages, iov);
1586                 if (likely(!IS_ERR(pfmr))) {
1587                         fmr->fmr_pool = fpo;
1588                         fmr->fmr_pfmr = pfmr;
1589                         return 0;
1590                 }
1591
1592                 cfs_spin_lock(&fps->fps_lock);
1593                 fpo->fpo_map_count --;
1594                 if (PTR_ERR(pfmr) != -EAGAIN) {
1595                         cfs_spin_unlock(&fps->fps_lock);
1596                         return PTR_ERR(pfmr);
1597                 }
1598
1599                 /* EAGAIN and ... */
1600                 if (version != fps->fps_version) {
1601                         cfs_spin_unlock(&fps->fps_lock);
1602                         goto again;
1603                 }
1604         }
1605
1606         if (fps->fps_increasing) {
1607                 cfs_spin_unlock(&fps->fps_lock);
1608                 CDEBUG(D_NET, "Another thread is allocating new "
1609                               "FMR pool, waiting for her to complete\n");
1610                 cfs_schedule();
1611                 goto again;
1612
1613         }
1614
1615         if (cfs_time_before(cfs_time_current(), fps->fps_next_retry)) {
1616                 /* someone failed recently */
1617                 cfs_spin_unlock(&fps->fps_lock);
1618                 return -EAGAIN;
1619         }
1620
1621         fps->fps_increasing = 1;
1622         cfs_spin_unlock(&fps->fps_lock);
1623
1624         CDEBUG(D_NET, "Allocate new FMR pool\n");
1625         rc = kiblnd_create_fmr_pool(fps, &fpo);
1626         cfs_spin_lock(&fps->fps_lock);
1627         fps->fps_increasing = 0;
1628         if (rc == 0) {
1629                 fps->fps_version ++;
1630                 cfs_list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1631         } else {
1632                 fps->fps_next_retry = cfs_time_shift(IBLND_POOL_RETRY);
1633         }
1634         cfs_spin_unlock(&fps->fps_lock);
1635
1636         goto again;
1637 }
1638
1639 static void
1640 kiblnd_fini_pool(kib_pool_t *pool)
1641 {
1642         LASSERT (cfs_list_empty(&pool->po_free_list));
1643         LASSERT (pool->po_allocated == 0);
1644
1645         CDEBUG(D_NET, "Finalize %s pool\n", pool->po_owner->ps_name);
1646 }
1647
1648 static void
1649 kiblnd_init_pool(kib_poolset_t *ps, kib_pool_t *pool, int size)
1650 {
1651         CDEBUG(D_NET, "Initialize %s pool\n", ps->ps_name);
1652
1653         memset(pool, 0, sizeof(kib_pool_t));
1654         CFS_INIT_LIST_HEAD(&pool->po_free_list);
1655         pool->po_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1656         pool->po_owner    = ps;
1657         pool->po_size     = size;
1658 }
1659
1660 void
1661 kiblnd_destroy_pool_list(cfs_list_t *head)
1662 {
1663         kib_pool_t *pool;
1664
1665         while (!cfs_list_empty(head)) {
1666                 pool = cfs_list_entry(head->next, kib_pool_t, po_list);
1667                 cfs_list_del(&pool->po_list);
1668
1669                 LASSERT (pool->po_owner != NULL);
1670                 pool->po_owner->ps_pool_destroy(pool);
1671         }
1672 }
1673
1674 static void
1675 kiblnd_fail_pool_set(kib_poolset_t *ps, cfs_list_t *zombies)
1676 {
1677         cfs_spin_lock(&ps->ps_lock);
1678         while (!cfs_list_empty(&ps->ps_pool_list)) {
1679                 kib_pool_t *po = cfs_list_entry(ps->ps_pool_list.next,
1680                                             kib_pool_t, po_list);
1681                 po->po_failed = 1;
1682                 cfs_list_del(&po->po_list);
1683                 if (po->po_allocated == 0)
1684                         cfs_list_add(&po->po_list, zombies);
1685                 else
1686                         cfs_list_add(&po->po_list, &ps->ps_failed_pool_list);
1687         }
1688         cfs_spin_unlock(&ps->ps_lock);
1689 }
1690
1691 static void
1692 kiblnd_fini_pool_set(kib_poolset_t *ps)
1693 {
1694         kiblnd_destroy_pool_list(&ps->ps_failed_pool_list);
1695         kiblnd_destroy_pool_list(&ps->ps_pool_list);
1696 }
1697
1698 static int
1699 kiblnd_init_pool_set(kib_poolset_t *ps, kib_net_t *net,
1700                      char *name, int size,
1701                      kib_ps_pool_create_t po_create,
1702                      kib_ps_pool_destroy_t po_destroy,
1703                      kib_ps_node_init_t nd_init,
1704                      kib_ps_node_fini_t nd_fini)
1705 {
1706         kib_pool_t    *pool;
1707         int            rc;
1708
1709         memset(ps, 0, sizeof(kib_poolset_t));
1710
1711         ps->ps_net          = net;
1712         ps->ps_pool_create  = po_create;
1713         ps->ps_pool_destroy = po_destroy;
1714         ps->ps_node_init    = nd_init;
1715         ps->ps_node_fini    = nd_fini;
1716         ps->ps_pool_size    = size;
1717         strncpy(ps->ps_name, name, IBLND_POOL_NAME_LEN);
1718         cfs_spin_lock_init(&ps->ps_lock);
1719         CFS_INIT_LIST_HEAD(&ps->ps_pool_list);
1720         CFS_INIT_LIST_HEAD(&ps->ps_failed_pool_list);
1721
1722         rc = ps->ps_pool_create(ps, size, &pool);
1723         if (rc == 0)
1724                 cfs_list_add(&pool->po_list, &ps->ps_pool_list);
1725         else
1726                 CERROR("Failed to create the first pool for %s\n", ps->ps_name);
1727
1728         return rc;
1729 }
1730
1731 static int
1732 kiblnd_pool_is_idle(kib_pool_t *pool, cfs_time_t now)
1733 {
1734         if (pool->po_allocated != 0) /* still in use */
1735                 return 0;
1736         if (pool->po_failed)
1737                 return 1;
1738         return cfs_time_aftereq(now, pool->po_deadline);
1739 }
1740
1741 void
1742 kiblnd_pool_free_node(kib_pool_t *pool, cfs_list_t *node)
1743 {
1744         CFS_LIST_HEAD  (zombies);
1745         kib_poolset_t  *ps = pool->po_owner;
1746         kib_pool_t     *tmp;
1747         cfs_time_t      now = cfs_time_current();
1748
1749         cfs_spin_lock(&ps->ps_lock);
1750
1751         if (ps->ps_node_fini != NULL)
1752                 ps->ps_node_fini(pool, node);
1753
1754         LASSERT (pool->po_allocated > 0);
1755         cfs_list_add(node, &pool->po_free_list);
1756         pool->po_allocated --;
1757
1758         cfs_list_for_each_entry_safe(pool, tmp, &ps->ps_pool_list, po_list) {
1759                 /* the first pool is persistent */
1760                 if (ps->ps_pool_list.next == &pool->po_list)
1761                         continue;
1762
1763                 if (kiblnd_pool_is_idle(pool, now))
1764                         cfs_list_move(&pool->po_list, &zombies);
1765         }
1766         cfs_spin_unlock(&ps->ps_lock);
1767
1768         if (!cfs_list_empty(&zombies))
1769                 kiblnd_destroy_pool_list(&zombies);
1770 }
1771
1772 cfs_list_t *
1773 kiblnd_pool_alloc_node(kib_poolset_t *ps)
1774 {
1775         cfs_list_t            *node;
1776         kib_pool_t            *pool;
1777         int                    rc;
1778
1779  again:
1780         cfs_spin_lock(&ps->ps_lock);
1781         cfs_list_for_each_entry(pool, &ps->ps_pool_list, po_list) {
1782                 if (cfs_list_empty(&pool->po_free_list))
1783                         continue;
1784
1785                 pool->po_allocated ++;
1786                 pool->po_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1787                 node = pool->po_free_list.next;
1788                 cfs_list_del(node);
1789
1790                 if (ps->ps_node_init != NULL) {
1791                         /* still hold the lock */
1792                         ps->ps_node_init(pool, node);
1793                 }
1794                 cfs_spin_unlock(&ps->ps_lock);
1795                 return node;
1796         }
1797
1798         /* no available tx pool and ... */
1799         if (ps->ps_increasing) {
1800                 /* another thread is allocating a new pool */
1801                 cfs_spin_unlock(&ps->ps_lock);
1802                 CDEBUG(D_NET, "Another thread is allocating new "
1803                        "%s pool, waiting for her to complete\n",
1804                        ps->ps_name);
1805                 cfs_schedule();
1806                 goto again;
1807         }
1808
1809         if (cfs_time_before(cfs_time_current(), ps->ps_next_retry)) {
1810                 /* someone failed recently */
1811                 cfs_spin_unlock(&ps->ps_lock);
1812                 return NULL;
1813         }
1814
1815         ps->ps_increasing = 1;
1816         cfs_spin_unlock(&ps->ps_lock);
1817
1818         CDEBUG(D_NET, "%s pool exhausted, allocate new pool\n", ps->ps_name);
1819
1820         rc = ps->ps_pool_create(ps, ps->ps_pool_size, &pool);
1821
1822         cfs_spin_lock(&ps->ps_lock);
1823         ps->ps_increasing = 0;
1824         if (rc == 0) {
1825                 cfs_list_add_tail(&pool->po_list, &ps->ps_pool_list);
1826         } else {
1827                 ps->ps_next_retry = cfs_time_shift(IBLND_POOL_RETRY);
1828                 CERROR("Can't allocate new %s pool because out of memory\n",
1829                        ps->ps_name);
1830         }
1831         cfs_spin_unlock(&ps->ps_lock);
1832
1833         goto again;
1834 }
1835
1836 void
1837 kiblnd_pmr_pool_unmap(kib_phys_mr_t *pmr)
1838 {
1839         kib_pmr_pool_t      *ppo = pmr->pmr_pool;
1840         struct ib_mr        *mr  = pmr->pmr_mr;
1841
1842         pmr->pmr_mr = NULL;
1843         kiblnd_pool_free_node(&ppo->ppo_pool, &pmr->pmr_list);
1844         if (mr != NULL)
1845                 ib_dereg_mr(mr);
1846 }
1847
1848 int
1849 kiblnd_pmr_pool_map(kib_pmr_poolset_t *pps, kib_hca_dev_t *hdev,
1850                     kib_rdma_desc_t *rd, __u64 *iova, kib_phys_mr_t **pp_pmr)
1851 {
1852         kib_phys_mr_t *pmr;
1853         cfs_list_t    *node;
1854         int            rc;
1855         int            i;
1856
1857         node = kiblnd_pool_alloc_node(&pps->pps_poolset);
1858         if (node == NULL) {
1859                 CERROR("Failed to allocate PMR descriptor\n");
1860                 return -ENOMEM;
1861         }
1862
1863         pmr = container_of(node, kib_phys_mr_t, pmr_list);
1864         if (pmr->pmr_pool->ppo_hdev != hdev) {
1865                 kiblnd_pool_free_node(&pmr->pmr_pool->ppo_pool, node);
1866                 return -EAGAIN;
1867         }
1868
1869         for (i = 0; i < rd->rd_nfrags; i ++) {
1870                 pmr->pmr_ipb[i].addr = rd->rd_frags[i].rf_addr;
1871                 pmr->pmr_ipb[i].size = rd->rd_frags[i].rf_nob;
1872         }
1873
1874         pmr->pmr_mr = ib_reg_phys_mr(hdev->ibh_pd,
1875                                      pmr->pmr_ipb, rd->rd_nfrags,
1876                                      IB_ACCESS_LOCAL_WRITE |
1877                                      IB_ACCESS_REMOTE_WRITE,
1878                                      iova);
1879         if (!IS_ERR(pmr->pmr_mr)) {
1880                 pmr->pmr_iova = *iova;
1881                 *pp_pmr = pmr;
1882                 return 0;
1883         }
1884
1885         rc = PTR_ERR(pmr->pmr_mr);
1886         CERROR("Failed ib_reg_phys_mr: %d\n", rc);
1887
1888         pmr->pmr_mr = NULL;
1889         kiblnd_pool_free_node(&pmr->pmr_pool->ppo_pool, node);
1890
1891         return rc;
1892 }
1893
1894 static void
1895 kiblnd_destroy_pmr_pool(kib_pool_t *pool)
1896 {
1897         kib_pmr_pool_t *ppo = container_of(pool, kib_pmr_pool_t, ppo_pool);
1898         kib_phys_mr_t  *pmr;
1899
1900         LASSERT (pool->po_allocated == 0);
1901
1902         while (!cfs_list_empty(&pool->po_free_list)) {
1903                 pmr = cfs_list_entry(pool->po_free_list.next,
1904                                      kib_phys_mr_t, pmr_list);
1905
1906                 LASSERT (pmr->pmr_mr == NULL);
1907                 cfs_list_del(&pmr->pmr_list);
1908
1909                 if (pmr->pmr_ipb != NULL) {
1910                         LIBCFS_FREE(pmr->pmr_ipb,
1911                                     IBLND_MAX_RDMA_FRAGS *
1912                                     sizeof(struct ib_phys_buf));
1913                 }
1914
1915                 LIBCFS_FREE(pmr, sizeof(kib_phys_mr_t));
1916         }
1917
1918         kiblnd_fini_pool(pool);
1919         if (ppo->ppo_hdev != NULL)
1920                 kiblnd_hdev_decref(ppo->ppo_hdev);
1921
1922         LIBCFS_FREE(ppo, sizeof(kib_pmr_pool_t));
1923 }
1924
1925 static int
1926 kiblnd_create_pmr_pool(kib_poolset_t *ps, int size, kib_pool_t **pp_po)
1927 {
1928         kib_pmr_pool_t      *ppo;
1929         kib_pool_t          *pool;
1930         kib_phys_mr_t       *pmr;
1931         int                  i;
1932
1933         LIBCFS_ALLOC(ppo, sizeof(kib_pmr_pool_t));
1934         if (ppo == NULL) {
1935                 CERROR("Failed to allocate PMR pool\n");
1936                 return -ENOMEM;
1937         }
1938
1939         pool = &ppo->ppo_pool;
1940         kiblnd_init_pool(ps, pool, size);
1941
1942         for (i = 0; i < size; i++) {
1943                 LIBCFS_ALLOC(pmr, sizeof(kib_phys_mr_t));
1944                 if (pmr == NULL)
1945                         break;
1946
1947                 memset(pmr, 0, sizeof(kib_phys_mr_t));
1948                 pmr->pmr_pool = ppo;
1949                 LIBCFS_ALLOC(pmr->pmr_ipb,
1950                              IBLND_MAX_RDMA_FRAGS *
1951                              sizeof(struct ib_phys_buf));
1952                 if (pmr->pmr_ipb == NULL)
1953                         break;
1954
1955                 cfs_list_add(&pmr->pmr_list, &pool->po_free_list);
1956         }
1957
1958         if (i < size) {
1959                 ps->ps_pool_destroy(pool);
1960                 return -ENOMEM;
1961         }
1962
1963         ppo->ppo_hdev = kiblnd_current_hdev(ps->ps_net->ibn_dev);
1964         *pp_po = pool;
1965         return 0;
1966 }
1967
1968 static void
1969 kiblnd_destroy_tx_pool(kib_pool_t *pool)
1970 {
1971         kib_tx_pool_t  *tpo = container_of(pool, kib_tx_pool_t, tpo_pool);
1972         int             i;
1973
1974         LASSERT (pool->po_allocated == 0);
1975
1976         if (tpo->tpo_tx_pages != NULL) {
1977                 kiblnd_unmap_tx_pool(tpo);
1978                 kiblnd_free_pages(tpo->tpo_tx_pages);
1979         }
1980
1981         if (tpo->tpo_tx_descs == NULL)
1982                 goto out;
1983
1984         for (i = 0; i < pool->po_size; i++) {
1985                 kib_tx_t *tx = &tpo->tpo_tx_descs[i];
1986
1987                 cfs_list_del(&tx->tx_list);
1988                 if (tx->tx_pages != NULL)
1989                         LIBCFS_FREE(tx->tx_pages,
1990                                     LNET_MAX_IOV *
1991                                     sizeof(*tx->tx_pages));
1992                 if (tx->tx_frags != NULL)
1993                         LIBCFS_FREE(tx->tx_frags,
1994                                     IBLND_MAX_RDMA_FRAGS *
1995                                             sizeof(*tx->tx_frags));
1996                 if (tx->tx_wrq != NULL)
1997                         LIBCFS_FREE(tx->tx_wrq,
1998                                     (1 + IBLND_MAX_RDMA_FRAGS) *
1999                                     sizeof(*tx->tx_wrq));
2000                 if (tx->tx_sge != NULL)
2001                         LIBCFS_FREE(tx->tx_sge,
2002                                     (1 + IBLND_MAX_RDMA_FRAGS) *
2003                                     sizeof(*tx->tx_sge));
2004                 if (tx->tx_rd != NULL)
2005                         LIBCFS_FREE(tx->tx_rd,
2006                                     offsetof(kib_rdma_desc_t,
2007                                              rd_frags[IBLND_MAX_RDMA_FRAGS]));
2008         }
2009
2010         LIBCFS_FREE(tpo->tpo_tx_descs,
2011                     pool->po_size * sizeof(kib_tx_t));
2012 out:
2013         kiblnd_fini_pool(pool);
2014         LIBCFS_FREE(tpo, sizeof(kib_tx_pool_t));
2015 }
2016
2017 static int
2018 kiblnd_create_tx_pool(kib_poolset_t *ps, int size, kib_pool_t **pp_po)
2019 {
2020         int            i;
2021         int            npg;
2022         kib_pool_t    *pool;
2023         kib_tx_pool_t *tpo;
2024
2025         LIBCFS_ALLOC(tpo, sizeof(kib_tx_pool_t));
2026         if (tpo == NULL) {
2027                 CERROR("Failed to allocate TX pool\n");
2028                 return -ENOMEM;
2029         }
2030
2031         pool = &tpo->tpo_pool;
2032         kiblnd_init_pool(ps, pool, size);
2033         tpo->tpo_tx_descs = NULL;
2034         tpo->tpo_tx_pages = NULL;
2035
2036         npg = (size * IBLND_MSG_SIZE + PAGE_SIZE - 1) / PAGE_SIZE;
2037         if (kiblnd_alloc_pages(&tpo->tpo_tx_pages, npg) != 0) {
2038                 CERROR("Can't allocate tx pages: %d\n", npg);
2039                 LIBCFS_FREE(tpo, sizeof(kib_tx_pool_t));
2040                 return -ENOMEM;
2041         }
2042
2043         LIBCFS_ALLOC (tpo->tpo_tx_descs, size * sizeof(kib_tx_t));
2044         if (tpo->tpo_tx_descs == NULL) {
2045                 CERROR("Can't allocate %d tx descriptors\n", size);
2046                 ps->ps_pool_destroy(pool);
2047                 return -ENOMEM;
2048         }
2049
2050         memset(tpo->tpo_tx_descs, 0, size * sizeof(kib_tx_t));
2051
2052         for (i = 0; i < size; i++) {
2053                 kib_tx_t *tx = &tpo->tpo_tx_descs[i];
2054
2055                 tx->tx_pool = tpo;
2056                 if (ps->ps_net->ibn_with_fmr){
2057                         LIBCFS_ALLOC(tx->tx_pages, LNET_MAX_IOV *
2058                                      sizeof(*tx->tx_pages));
2059                         if (tx->tx_pages == NULL)
2060                                 break;
2061                 }
2062
2063                 LIBCFS_ALLOC(tx->tx_frags,
2064                              IBLND_MAX_RDMA_FRAGS *
2065                              sizeof(*tx->tx_frags));
2066                 if (tx->tx_frags == NULL)
2067                         break;
2068
2069                 LIBCFS_ALLOC(tx->tx_wrq,
2070                              (1 + IBLND_MAX_RDMA_FRAGS) *
2071                              sizeof(*tx->tx_wrq));
2072                 if (tx->tx_wrq == NULL)
2073                         break;
2074
2075                 LIBCFS_ALLOC(tx->tx_sge,
2076                              (1 + IBLND_MAX_RDMA_FRAGS) *
2077                              sizeof(*tx->tx_sge));
2078                 if (tx->tx_sge == NULL)
2079                         break;
2080
2081                 LIBCFS_ALLOC(tx->tx_rd,
2082                              offsetof(kib_rdma_desc_t,
2083                                       rd_frags[IBLND_MAX_RDMA_FRAGS]));
2084                 if (tx->tx_rd == NULL)
2085                         break;
2086         }
2087
2088         if (i == size) {
2089                 kiblnd_map_tx_pool(tpo);
2090                 *pp_po = pool;
2091                 return 0;
2092         }
2093
2094         ps->ps_pool_destroy(pool);
2095         return -ENOMEM;
2096 }
2097
2098 static void
2099 kiblnd_tx_init(kib_pool_t *pool, cfs_list_t *node)
2100 {
2101         kib_tx_poolset_t *tps = container_of(pool->po_owner, kib_tx_poolset_t,
2102                                              tps_poolset);
2103         kib_tx_t         *tx  = cfs_list_entry(node, kib_tx_t, tx_list);
2104
2105         tx->tx_cookie = tps->tps_next_tx_cookie ++;
2106 }
2107
2108 void
2109 kiblnd_ni_fini_pools(kib_net_t *net)
2110 {
2111         kiblnd_fini_pool_set(&net->ibn_tx_ps.tps_poolset);
2112         if (net->ibn_with_fmr)
2113                 kiblnd_fini_fmr_pool_set(&net->ibn_fmr_ps);
2114         else if (net->ibn_with_pmr)
2115                 kiblnd_fini_pool_set(&net->ibn_pmr_ps.pps_poolset);
2116 }
2117
2118 int
2119 kiblnd_net_init_pools(kib_net_t *net)
2120 {
2121         kib_fmr_poolset_t *fps = &net->ibn_fmr_ps;
2122         kib_pmr_poolset_t *pps = &net->ibn_pmr_ps;
2123         kib_tx_poolset_t  *tps = &net->ibn_tx_ps;
2124         unsigned long      flags;
2125         int                rc;
2126
2127         if (*kiblnd_tunables.kib_fmr_pool_size <
2128             *kiblnd_tunables.kib_ntx / 4) {
2129                 CERROR("Can't set fmr pool size (%d) < ntx / 4(%d)\n",
2130                        *kiblnd_tunables.kib_fmr_pool_size,
2131                        *kiblnd_tunables.kib_ntx / 4);
2132                 return -EINVAL;
2133         }
2134
2135         if (*kiblnd_tunables.kib_pmr_pool_size <
2136             *kiblnd_tunables.kib_ntx / 4) {
2137                 CERROR("Can't set pmr pool size (%d) < ntx / 4(%d)\n",
2138                        *kiblnd_tunables.kib_pmr_pool_size,
2139                        *kiblnd_tunables.kib_ntx / 4);
2140                 return -EINVAL;
2141         }
2142
2143         cfs_read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2144         if (*kiblnd_tunables.kib_map_on_demand > 0 ||
2145             net->ibn_dev->ibd_hdev->ibh_nmrs > 1) {
2146                 /* premapping can fail if ibd_nmr > 1, so we always create
2147                  * FMR/PMR pool and map-on-demand if premapping failed */
2148                 cfs_read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2149                 rc = kiblnd_init_fmr_pool_set(fps, net);
2150                 if (rc == 0) {
2151                         net->ibn_with_fmr = 1;
2152                 } else if (rc == -ENOSYS) {
2153                         rc = kiblnd_init_pool_set(&pps->pps_poolset, net, "PMR",
2154                                                   *kiblnd_tunables.kib_pmr_pool_size,
2155                                                   kiblnd_create_pmr_pool,
2156                                                   kiblnd_destroy_pmr_pool,
2157                                                   NULL, NULL);
2158                         if (rc == 0)
2159                                 net->ibn_with_pmr = 1;
2160                 }
2161                 if (rc != 0)
2162                         return rc;
2163         } else {
2164                 cfs_read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2165         }
2166
2167         rc = kiblnd_init_pool_set(&tps->tps_poolset, net, "TX", IBLND_TX_MSGS(),
2168                                   kiblnd_create_tx_pool, kiblnd_destroy_tx_pool,
2169                                   kiblnd_tx_init, NULL);
2170         if (rc == 0)
2171                 return 0;
2172
2173         if (net->ibn_with_fmr)
2174                 kiblnd_fini_fmr_pool_set(fps);
2175         else if (net->ibn_with_pmr)
2176                 kiblnd_fini_pool_set(&pps->pps_poolset);
2177
2178         return rc;
2179 }
2180
2181 static int
2182 kiblnd_hdev_get_attr(kib_hca_dev_t *hdev)
2183 {
2184         struct ib_device_attr *attr;
2185         int                    rc;
2186
2187         /* It's safe to assume a HCA can handle a page size
2188          * matching that of the native system */
2189         hdev->ibh_page_shift = PAGE_SHIFT;
2190         hdev->ibh_page_size  = 1 << PAGE_SHIFT;
2191         hdev->ibh_page_mask  = ~((__u64)hdev->ibh_page_size - 1);
2192
2193         LIBCFS_ALLOC(attr, sizeof(*attr));
2194         if (attr == NULL) {
2195                 CERROR("Out of memory\n");
2196                 return -ENOMEM;
2197         }
2198
2199         rc = ib_query_device(hdev->ibh_ibdev, attr);
2200         if (rc == 0)
2201                 hdev->ibh_mr_size = attr->max_mr_size;
2202
2203         LIBCFS_FREE(attr, sizeof(*attr));
2204
2205         if (rc != 0) {
2206                 CERROR("Failed to query IB device: %d\n", rc);
2207                 return rc;
2208         }
2209
2210 #ifdef HAVE_OFED_TRANSPORT_IWARP
2211         /* XXX We can't trust this value returned by Chelsio driver, it's wrong
2212          * and we have reported the bug, remove these in the future when Chelsio
2213          * bug got fixed. */
2214         if (rdma_node_get_transport(hdev->ibh_ibdev->node_type) ==
2215             RDMA_TRANSPORT_IWARP)
2216                 hdev->ibh_mr_size = (1ULL << 32) - 1;
2217 #endif
2218
2219         if (hdev->ibh_mr_size == ~0ULL) {
2220                 hdev->ibh_mr_shift = 64;
2221                 return 0;
2222         }
2223
2224         for (hdev->ibh_mr_shift = 0;
2225              hdev->ibh_mr_shift < 64; hdev->ibh_mr_shift ++) {
2226                 if (hdev->ibh_mr_size == (1ULL << hdev->ibh_mr_shift) ||
2227                     hdev->ibh_mr_size == (1ULL << hdev->ibh_mr_shift) - 1)
2228                         return 0;
2229         }
2230
2231         CERROR("Invalid mr size: "LPX64"\n", hdev->ibh_mr_size);
2232         return -EINVAL;
2233 }
2234
2235 void
2236 kiblnd_hdev_cleanup_mrs(kib_hca_dev_t *hdev)
2237 {
2238         int     i;
2239
2240         if (hdev->ibh_nmrs == 0 || hdev->ibh_mrs == NULL)
2241                 return;
2242
2243         for (i = 0; i < hdev->ibh_nmrs; i++) {
2244                 if (hdev->ibh_mrs[i] == NULL)
2245                         break;
2246
2247                 ib_dereg_mr(hdev->ibh_mrs[i]);
2248         }
2249
2250         LIBCFS_FREE(hdev->ibh_mrs, sizeof(*hdev->ibh_mrs) * hdev->ibh_nmrs);
2251         hdev->ibh_mrs  = NULL;
2252         hdev->ibh_nmrs = 0;
2253 }
2254
2255 void
2256 kiblnd_hdev_destroy(kib_hca_dev_t *hdev)
2257 {
2258         kiblnd_hdev_cleanup_mrs(hdev);
2259
2260         if (hdev->ibh_pd != NULL)
2261                 ib_dealloc_pd(hdev->ibh_pd);
2262
2263         if (hdev->ibh_cmid != NULL)
2264                 rdma_destroy_id(hdev->ibh_cmid);
2265
2266         LIBCFS_FREE(hdev, sizeof(*hdev));
2267 }
2268
2269 int
2270 kiblnd_hdev_setup_mrs(kib_hca_dev_t *hdev)
2271 {
2272         struct ib_mr *mr;
2273         int           i;
2274         int           rc;
2275         __u64         mm_size;
2276         __u64         mr_size;
2277         int           acflags = IB_ACCESS_LOCAL_WRITE |
2278                                 IB_ACCESS_REMOTE_WRITE;
2279
2280         rc = kiblnd_hdev_get_attr(hdev);
2281         if (rc != 0)
2282                 return rc;
2283
2284         if (hdev->ibh_mr_shift == 64) {
2285                 LIBCFS_ALLOC(hdev->ibh_mrs, 1 * sizeof(*hdev->ibh_mrs));
2286                 if (hdev->ibh_mrs == NULL) {
2287                         CERROR("Failed to allocate MRs table\n");
2288                         return -ENOMEM;
2289                 }
2290
2291                 hdev->ibh_mrs[0] = NULL;
2292                 hdev->ibh_nmrs   = 1;
2293
2294                 mr = ib_get_dma_mr(hdev->ibh_pd, acflags);
2295                 if (IS_ERR(mr)) {
2296                         CERROR("Failed ib_get_dma_mr : %ld\n", PTR_ERR(mr));
2297                         kiblnd_hdev_cleanup_mrs(hdev);
2298                         return PTR_ERR(mr);
2299                 }
2300
2301                 hdev->ibh_mrs[0] = mr;
2302
2303                 goto out;
2304         }
2305
2306         mr_size = (1ULL << hdev->ibh_mr_shift);
2307         mm_size = (unsigned long)high_memory - PAGE_OFFSET;
2308
2309         hdev->ibh_nmrs = (int)((mm_size + mr_size - 1) >> hdev->ibh_mr_shift);
2310
2311         if (hdev->ibh_mr_shift < 32 || hdev->ibh_nmrs > 1024) {
2312                 /* it's 4T..., assume we will re-code at that time */
2313                 CERROR("Can't support memory size: x"LPX64
2314                        " with MR size: x"LPX64"\n", mm_size, mr_size);
2315                 return -EINVAL;
2316         }
2317
2318         /* create an array of MRs to cover all memory */
2319         LIBCFS_ALLOC(hdev->ibh_mrs, sizeof(*hdev->ibh_mrs) * hdev->ibh_nmrs);
2320         if (hdev->ibh_mrs == NULL) {
2321                 CERROR("Failed to allocate MRs' table\n");
2322                 return -ENOMEM;
2323         }
2324
2325         memset(hdev->ibh_mrs, 0, sizeof(*hdev->ibh_mrs) * hdev->ibh_nmrs);
2326
2327         for (i = 0; i < hdev->ibh_nmrs; i++) {
2328                 struct ib_phys_buf ipb;
2329                 __u64              iova;
2330
2331                 ipb.size = hdev->ibh_mr_size;
2332                 ipb.addr = i * mr_size;
2333                 iova     = ipb.addr;
2334
2335                 mr = ib_reg_phys_mr(hdev->ibh_pd, &ipb, 1, acflags, &iova);
2336                 if (IS_ERR(mr)) {
2337                         CERROR("Failed ib_reg_phys_mr addr "LPX64
2338                                " size "LPX64" : %ld\n",
2339                                ipb.addr, ipb.size, PTR_ERR(mr));
2340                         kiblnd_hdev_cleanup_mrs(hdev);
2341                         return PTR_ERR(mr);
2342                 }
2343
2344                 LASSERT (iova == ipb.addr);
2345
2346                 hdev->ibh_mrs[i] = mr;
2347         }
2348
2349 out:
2350         if (hdev->ibh_mr_size != ~0ULL || hdev->ibh_nmrs != 1)
2351                 LCONSOLE_INFO("Register global MR array, MR size: "
2352                               LPX64", array size: %d\n",
2353                               hdev->ibh_mr_size, hdev->ibh_nmrs);
2354         return 0;
2355 }
2356
2357 static int
2358 kiblnd_dummy_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2359 {       /* DUMMY */
2360         return 0;
2361 }
2362
2363 static int
2364 kiblnd_dev_need_failover(kib_dev_t *dev)
2365 {
2366         struct rdma_cm_id  *cmid;
2367         struct sockaddr_in  srcaddr;
2368         struct sockaddr_in  dstaddr;
2369         int                 rc;
2370
2371         if (dev->ibd_hdev == NULL || /* initializing */
2372             dev->ibd_hdev->ibh_cmid == NULL || /* listener is dead */
2373             *kiblnd_tunables.kib_dev_failover > 1) /* debugging */
2374                 return 1;
2375
2376         /* XXX: it's UGLY, but I don't have better way to find
2377          * ib-bonding HCA failover because:
2378          *
2379          * a. no reliable CM event for HCA failover...
2380          * b. no OFED API to get ib_device for current net_device...
2381          *
2382          * We have only two choices at this point:
2383          *
2384          * a. rdma_bind_addr(), it will conflict with listener cmid
2385          * b. rdma_resolve_addr() to zero addr */
2386         cmid = kiblnd_rdma_create_id(kiblnd_dummy_callback, dev, RDMA_PS_TCP,
2387                                      IB_QPT_RC);
2388         if (IS_ERR(cmid)) {
2389                 rc = PTR_ERR(cmid);
2390                 CERROR("Failed to create cmid for failover: %d\n", rc);
2391                 return rc;
2392         }
2393
2394         memset(&srcaddr, 0, sizeof(srcaddr));
2395         srcaddr.sin_family      = AF_INET;
2396         srcaddr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2397
2398         memset(&dstaddr, 0, sizeof(dstaddr));
2399         dstaddr.sin_family = AF_INET;
2400         rc = rdma_resolve_addr(cmid, (struct sockaddr *)&srcaddr,
2401                                (struct sockaddr *)&dstaddr, 1);
2402         if (rc != 0) {
2403                 CERROR("Failed to bind %s to device: %d\n",
2404                        dev->ibd_ifname, rc);
2405                 rdma_destroy_id(cmid);
2406                 return rc;
2407         }
2408
2409         LASSERT (cmid->device != NULL);
2410         if (dev->ibd_hdev->ibh_ibdev == cmid->device) {
2411                 /* don't need device failover */
2412                 rdma_destroy_id(cmid);
2413                 return 0;
2414         }
2415
2416         return 1;
2417 }
2418
2419 int
2420 kiblnd_dev_failover(kib_dev_t *dev)
2421 {
2422         CFS_LIST_HEAD      (zombie_tpo);
2423         CFS_LIST_HEAD      (zombie_ppo);
2424         CFS_LIST_HEAD      (zombie_fpo);
2425         struct rdma_cm_id  *cmid  = NULL;
2426         kib_hca_dev_t      *hdev  = NULL;
2427         kib_hca_dev_t      *old;
2428         struct ib_pd       *pd;
2429         kib_net_t          *net;
2430         struct sockaddr_in  addr;
2431         unsigned long       flags;
2432         int                 rc = 0;
2433
2434         LASSERT (*kiblnd_tunables.kib_dev_failover > 1 ||
2435                  dev->ibd_can_failover ||
2436                  dev->ibd_hdev == NULL);
2437
2438         rc = kiblnd_dev_need_failover(dev);
2439         if (rc <= 0)
2440                 goto out;
2441
2442         if (dev->ibd_hdev != NULL &&
2443             dev->ibd_hdev->ibh_cmid != NULL) {
2444                 /* XXX it's not good to close old listener at here,
2445                  * because we can fail to create new listener.
2446                  * But we have to close it now, otherwise rdma_bind_addr
2447                  * will return EADDRINUSE... How crap! */
2448                 cfs_write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2449
2450                 cmid = dev->ibd_hdev->ibh_cmid;
2451                 /* make next schedule of kiblnd_dev_need_failover
2452                  * will return 1 for me */
2453                 dev->ibd_hdev->ibh_cmid  = NULL;
2454                 cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2455
2456                 rdma_destroy_id(cmid);
2457         }
2458
2459         cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, dev, RDMA_PS_TCP,
2460                                      IB_QPT_RC);
2461         if (IS_ERR(cmid)) {
2462                 rc = PTR_ERR(cmid);
2463                 CERROR("Failed to create cmid for failover: %d\n", rc);
2464                 goto out;
2465         }
2466
2467         memset(&addr, 0, sizeof(addr));
2468         addr.sin_family      = AF_INET;
2469         addr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2470         addr.sin_port        = htons(*kiblnd_tunables.kib_service);
2471
2472         /* Bind to failover device or port */
2473         rc = rdma_bind_addr(cmid, (struct sockaddr *)&addr);
2474         if (rc != 0) {
2475                 CERROR("Failed to bind %s to device: %d\n",
2476                        dev->ibd_ifname, rc);
2477                 rdma_destroy_id(cmid);
2478                 goto out;
2479         }
2480
2481         LIBCFS_ALLOC(hdev, sizeof(*hdev));
2482         if (hdev == NULL) {
2483                 CERROR("Failed to allocate kib_hca_dev\n");
2484                 rdma_destroy_id(cmid);
2485                 rc = -ENOMEM;
2486                 goto out;
2487         }
2488         memset(hdev, 0, sizeof(*hdev));
2489         atomic_set(&hdev->ibh_ref, 1);
2490         hdev->ibh_dev   = dev;
2491         hdev->ibh_cmid  = cmid;
2492         hdev->ibh_ibdev = cmid->device;
2493
2494         pd = ib_alloc_pd(cmid->device);
2495         if (IS_ERR(pd)) {
2496                 rc = PTR_ERR(pd);
2497                 CERROR("Can't allocate PD: %d\n", rc);
2498                 goto out;
2499         }
2500
2501         hdev->ibh_pd = pd;
2502
2503         rc = rdma_listen(cmid, 0);
2504         if (rc != 0) {
2505                 CERROR("Can't start new listener: %d\n", rc);
2506                 goto out;
2507         }
2508
2509         rc = kiblnd_hdev_setup_mrs(hdev);
2510         if (rc != 0) {
2511                 CERROR("Can't setup device: %d\n", rc);
2512                 goto out;
2513         }
2514
2515         cfs_write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2516
2517         old = dev->ibd_hdev;
2518         dev->ibd_hdev = hdev; /* take over the refcount */
2519         hdev = old;
2520
2521         cfs_list_for_each_entry(net, &dev->ibd_nets, ibn_list) {
2522                 kiblnd_fail_pool_set(&net->ibn_tx_ps.tps_poolset, &zombie_tpo);
2523                 if (net->ibn_with_pmr)
2524                         kiblnd_fail_pool_set(&net->ibn_pmr_ps.pps_poolset, &zombie_ppo);
2525                 if (net->ibn_with_fmr)
2526                         kiblnd_fail_fmr_pool_set(&net->ibn_fmr_ps, &zombie_fpo);
2527         }
2528
2529         cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2530  out:
2531         if (!cfs_list_empty(&zombie_tpo))
2532                 kiblnd_destroy_pool_list(&zombie_tpo);
2533         if (!cfs_list_empty(&zombie_ppo))
2534                 kiblnd_destroy_pool_list(&zombie_ppo);
2535         if (!cfs_list_empty(&zombie_fpo))
2536                 kiblnd_destroy_fmr_pool_list(&zombie_fpo);
2537         if (hdev != NULL)
2538                 kiblnd_hdev_decref(hdev);
2539
2540         if (rc != 0)
2541                 dev->ibd_failed_failover++;
2542         else
2543                 dev->ibd_failed_failover = 0;
2544
2545         return rc;
2546 }
2547
2548 void
2549 kiblnd_destroy_dev (kib_dev_t *dev)
2550 {
2551         LASSERT (dev->ibd_nnets == 0);
2552         LASSERT (cfs_list_empty(&dev->ibd_nets));
2553
2554         cfs_list_del(&dev->ibd_fail_list);
2555         cfs_list_del(&dev->ibd_list);
2556
2557         if (dev->ibd_hdev != NULL)
2558                 kiblnd_hdev_decref(dev->ibd_hdev);
2559
2560         LIBCFS_FREE(dev, sizeof(*dev));
2561 }
2562
2563 kib_dev_t *
2564 kiblnd_create_dev(char *ifname)
2565 {
2566         struct net_device *netdev;
2567         kib_dev_t         *dev;
2568         __u32              netmask;
2569         __u32              ip;
2570         int                up;
2571         int                rc;
2572
2573         rc = libcfs_ipif_query(ifname, &up, &ip, &netmask);
2574         if (rc != 0) {
2575                 CERROR("Can't query IPoIB interface %s: %d\n",
2576                        ifname, rc);
2577                 return NULL;
2578         }
2579
2580         if (!up) {
2581                 CERROR("Can't query IPoIB interface %s: it's down\n", ifname);
2582                 return NULL;
2583         }
2584
2585         LIBCFS_ALLOC(dev, sizeof(*dev));
2586         if (dev == NULL)
2587                 return NULL;
2588
2589         memset(dev, 0, sizeof(*dev));
2590 #ifdef HAVE_DEV_GET_BY_NAME_2ARG
2591         netdev = dev_get_by_name(&init_net, ifname);
2592 #else
2593         netdev = dev_get_by_name(ifname);
2594 #endif
2595         if (netdev == NULL) {
2596                 dev->ibd_can_failover = 0;
2597         } else {
2598                 dev->ibd_can_failover = !!(netdev->flags & IFF_MASTER);
2599                 dev_put(netdev);
2600         }
2601
2602         CFS_INIT_LIST_HEAD(&dev->ibd_nets);
2603         CFS_INIT_LIST_HEAD(&dev->ibd_list); /* not yet in kib_devs */
2604         CFS_INIT_LIST_HEAD(&dev->ibd_fail_list);
2605         dev->ibd_ifip = ip;
2606         strcpy(&dev->ibd_ifname[0], ifname);
2607
2608         /* initialize the device */
2609         rc = kiblnd_dev_failover(dev);
2610         if (rc != 0) {
2611                 CERROR("Can't initialize device: %d\n", rc);
2612                 LIBCFS_FREE(dev, sizeof(*dev));
2613                 return NULL;
2614         }
2615
2616         cfs_list_add_tail(&dev->ibd_list,
2617                           &kiblnd_data.kib_devs);
2618         return dev;
2619 }
2620
2621 void
2622 kiblnd_base_shutdown (void)
2623 {
2624         int i;
2625
2626         LASSERT (cfs_list_empty(&kiblnd_data.kib_devs));
2627
2628         CDEBUG(D_MALLOC, "before LND base cleanup: kmem %d\n",
2629                cfs_atomic_read(&libcfs_kmemory));
2630
2631         switch (kiblnd_data.kib_init) {
2632         default:
2633                 LBUG();
2634
2635         case IBLND_INIT_ALL:
2636         case IBLND_INIT_DATA:
2637                 LASSERT (kiblnd_data.kib_peers != NULL);
2638                 for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
2639                         LASSERT (cfs_list_empty(&kiblnd_data.kib_peers[i]));
2640                 }
2641                 LASSERT (cfs_list_empty(&kiblnd_data.kib_connd_zombies));
2642                 LASSERT (cfs_list_empty(&kiblnd_data.kib_connd_conns));
2643
2644                 /* flag threads to terminate; wake and wait for them to die */
2645                 kiblnd_data.kib_shutdown = 1;
2646                 cfs_waitq_broadcast(&kiblnd_data.kib_sched_waitq);
2647                 cfs_waitq_broadcast(&kiblnd_data.kib_connd_waitq);
2648                 cfs_waitq_broadcast(&kiblnd_data.kib_failover_waitq);
2649
2650                 i = 2;
2651                 while (cfs_atomic_read(&kiblnd_data.kib_nthreads) != 0) {
2652                         i++;
2653                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
2654                                "Waiting for %d threads to terminate\n",
2655                                cfs_atomic_read(&kiblnd_data.kib_nthreads));
2656                         cfs_pause(cfs_time_seconds(1));
2657                 }
2658
2659                 /* fall through */
2660
2661         case IBLND_INIT_NOTHING:
2662                 break;
2663         }
2664
2665         if (kiblnd_data.kib_peers != NULL)
2666                 LIBCFS_FREE(kiblnd_data.kib_peers,
2667                             sizeof(cfs_list_t) *
2668                             kiblnd_data.kib_peer_hash_size);
2669
2670         CDEBUG(D_MALLOC, "after LND base cleanup: kmem %d\n",
2671                cfs_atomic_read(&libcfs_kmemory));
2672
2673         kiblnd_data.kib_init = IBLND_INIT_NOTHING;
2674         PORTAL_MODULE_UNUSE;
2675 }
2676
2677 void
2678 kiblnd_shutdown (lnet_ni_t *ni)
2679 {
2680         kib_net_t        *net = ni->ni_data;
2681         cfs_rwlock_t     *g_lock = &kiblnd_data.kib_global_lock;
2682         int               i;
2683         unsigned long     flags;
2684
2685         LASSERT(kiblnd_data.kib_init == IBLND_INIT_ALL);
2686
2687         if (net == NULL)
2688                 goto out;
2689
2690         CDEBUG(D_MALLOC, "before LND net cleanup: kmem %d\n",
2691                cfs_atomic_read(&libcfs_kmemory));
2692
2693         cfs_write_lock_irqsave(g_lock, flags);
2694         net->ibn_shutdown = 1;
2695         cfs_write_unlock_irqrestore(g_lock, flags);
2696
2697         switch (net->ibn_init) {
2698         default:
2699                 LBUG();
2700
2701         case IBLND_INIT_ALL:
2702                 /* nuke all existing peers within this net */
2703                 kiblnd_del_peer(ni, LNET_NID_ANY);
2704
2705                 /* Wait for all peer state to clean up */
2706                 i = 2;
2707                 while (cfs_atomic_read(&net->ibn_npeers) != 0) {
2708                         i++;
2709                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* 2**n? */
2710                                "%s: waiting for %d peers to disconnect\n",
2711                                libcfs_nid2str(ni->ni_nid),
2712                                cfs_atomic_read(&net->ibn_npeers));
2713                         cfs_pause(cfs_time_seconds(1));
2714                 }
2715
2716                 kiblnd_ni_fini_pools(net);
2717
2718                 cfs_write_lock_irqsave(g_lock, flags);
2719                 LASSERT (net->ibn_dev->ibd_nnets > 0);
2720                 net->ibn_dev->ibd_nnets--;
2721                 cfs_list_del(&net->ibn_list);
2722                 cfs_write_unlock_irqrestore(g_lock, flags);
2723
2724                 /* fall through */
2725
2726         case IBLND_INIT_NOTHING:
2727                 LASSERT (cfs_atomic_read(&net->ibn_nconns) == 0);
2728
2729                 if (net->ibn_dev != NULL &&
2730                     net->ibn_dev->ibd_nnets == 0)
2731                         kiblnd_destroy_dev(net->ibn_dev);
2732
2733                 break;
2734         }
2735
2736         CDEBUG(D_MALLOC, "after LND net cleanup: kmem %d\n",
2737                cfs_atomic_read(&libcfs_kmemory));
2738
2739         net->ibn_init = IBLND_INIT_NOTHING;
2740         ni->ni_data = NULL;
2741
2742         LIBCFS_FREE(net, sizeof(*net));
2743
2744 out:
2745         if (cfs_list_empty(&kiblnd_data.kib_devs))
2746                 kiblnd_base_shutdown();
2747         return;
2748 }
2749
2750 int
2751 kiblnd_base_startup (void)
2752 {
2753         int i;
2754         int rc;
2755
2756         LASSERT (kiblnd_data.kib_init == IBLND_INIT_NOTHING);
2757
2758         PORTAL_MODULE_USE;
2759         memset(&kiblnd_data, 0, sizeof(kiblnd_data)); /* zero pointers, flags etc */
2760
2761         cfs_rwlock_init(&kiblnd_data.kib_global_lock);
2762
2763         CFS_INIT_LIST_HEAD(&kiblnd_data.kib_devs);
2764         CFS_INIT_LIST_HEAD(&kiblnd_data.kib_failed_devs);
2765
2766         kiblnd_data.kib_peer_hash_size = IBLND_PEER_HASH_SIZE;
2767         LIBCFS_ALLOC(kiblnd_data.kib_peers,
2768                      sizeof(cfs_list_t) *
2769                             kiblnd_data.kib_peer_hash_size);
2770         if (kiblnd_data.kib_peers == NULL) {
2771                 goto failed;
2772         }
2773         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++)
2774                 CFS_INIT_LIST_HEAD(&kiblnd_data.kib_peers[i]);
2775
2776         cfs_spin_lock_init(&kiblnd_data.kib_connd_lock);
2777         CFS_INIT_LIST_HEAD(&kiblnd_data.kib_connd_conns);
2778         CFS_INIT_LIST_HEAD(&kiblnd_data.kib_connd_zombies);
2779         cfs_waitq_init(&kiblnd_data.kib_connd_waitq);
2780
2781         cfs_spin_lock_init(&kiblnd_data.kib_sched_lock);
2782         CFS_INIT_LIST_HEAD(&kiblnd_data.kib_sched_conns);
2783         cfs_waitq_init(&kiblnd_data.kib_sched_waitq);
2784         cfs_waitq_init(&kiblnd_data.kib_failover_waitq);
2785
2786         kiblnd_data.kib_error_qpa.qp_state = IB_QPS_ERR;
2787
2788         /* lists/ptrs/locks initialised */
2789         kiblnd_data.kib_init = IBLND_INIT_DATA;
2790         /*****************************************************/
2791
2792         for (i = 0; i < IBLND_N_SCHED; i++) {
2793                 rc = kiblnd_thread_start(kiblnd_scheduler, (void *)((long)i));
2794                 if (rc != 0) {
2795                         CERROR("Can't spawn o2iblnd scheduler[%d]: %d\n",
2796                                i, rc);
2797                         goto failed;
2798                 }
2799         }
2800
2801         rc = kiblnd_thread_start(kiblnd_connd, NULL);
2802         if (rc != 0) {
2803                 CERROR("Can't spawn o2iblnd connd: %d\n", rc);
2804                 goto failed;
2805         }
2806
2807         if (*kiblnd_tunables.kib_dev_failover != 0)
2808                 rc = kiblnd_thread_start(kiblnd_failover_thread, NULL);
2809
2810         if (rc != 0) {
2811                 CERROR("Can't spawn o2iblnd failover thread: %d\n", rc);
2812                 goto failed;
2813         }
2814
2815         /* flag everything initialised */
2816         kiblnd_data.kib_init = IBLND_INIT_ALL;
2817         /*****************************************************/
2818
2819         return 0;
2820
2821  failed:
2822         kiblnd_base_shutdown();
2823         return -ENETDOWN;
2824 }
2825
2826 int
2827 kiblnd_startup (lnet_ni_t *ni)
2828 {
2829         char                     *ifname;
2830         kib_dev_t                *ibdev = NULL;
2831         kib_net_t                *net;
2832         cfs_list_t               *tmp;
2833         struct timeval            tv;
2834         unsigned long             flags;
2835         int                       rc;
2836
2837         LASSERT (ni->ni_lnd == &the_o2iblnd);
2838
2839         if (kiblnd_data.kib_init == IBLND_INIT_NOTHING) {
2840                 rc = kiblnd_base_startup();
2841                 if (rc != 0)
2842                         return rc;
2843         }
2844
2845         LIBCFS_ALLOC(net, sizeof(*net));
2846         ni->ni_data = net;
2847         if (net == NULL)
2848                 goto failed;
2849
2850         memset(net, 0, sizeof(*net));
2851
2852         cfs_gettimeofday(&tv);
2853         net->ibn_incarnation = (((__u64)tv.tv_sec) * 1000000) + tv.tv_usec;
2854
2855         ni->ni_peertimeout    = *kiblnd_tunables.kib_peertimeout;
2856         ni->ni_maxtxcredits   = *kiblnd_tunables.kib_credits;
2857         ni->ni_peertxcredits  = *kiblnd_tunables.kib_peertxcredits;
2858         ni->ni_peerrtrcredits = *kiblnd_tunables.kib_peerrtrcredits;
2859
2860         if (ni->ni_interfaces[0] != NULL) {
2861                 /* Use the IPoIB interface specified in 'networks=' */
2862
2863                 CLASSERT (LNET_MAX_INTERFACES > 1);
2864                 if (ni->ni_interfaces[1] != NULL) {
2865                         CERROR("Multiple interfaces not supported\n");
2866                         goto failed;
2867                 }
2868
2869                 ifname = ni->ni_interfaces[0];
2870         } else {
2871                 ifname = *kiblnd_tunables.kib_default_ipif;
2872         }
2873
2874         if (strlen(ifname) >= sizeof(ibdev->ibd_ifname)) {
2875                 CERROR("IPoIB interface name too long: %s\n", ifname);
2876                 goto failed;
2877         }
2878
2879         cfs_list_for_each (tmp, &kiblnd_data.kib_devs) {
2880                 ibdev = cfs_list_entry(tmp, kib_dev_t, ibd_list);
2881
2882                 if (!strcmp(&ibdev->ibd_ifname[0], ifname))
2883                         break;
2884
2885                 ibdev = NULL;
2886         }
2887
2888         if (ibdev == NULL)
2889                 ibdev = kiblnd_create_dev(ifname);
2890
2891         if (ibdev == NULL)
2892                 goto failed;
2893
2894         net->ibn_dev = ibdev;
2895         ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), ibdev->ibd_ifip);
2896
2897         rc = kiblnd_net_init_pools(net);
2898         if (rc != 0) {
2899                 CERROR("Failed to initialize NI pools: %d\n", rc);
2900                 goto failed;
2901         }
2902
2903         cfs_write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2904         ibdev->ibd_nnets++;
2905         cfs_list_add_tail(&net->ibn_list, &ibdev->ibd_nets);
2906         cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2907
2908         net->ibn_init = IBLND_INIT_ALL;
2909
2910         return 0;
2911
2912 failed:
2913         if (net->ibn_dev == NULL && ibdev != NULL)
2914                 kiblnd_destroy_dev(ibdev);
2915
2916         kiblnd_shutdown(ni);
2917
2918         CDEBUG(D_NET, "kiblnd_startup failed\n");
2919         return -ENETDOWN;
2920 }
2921
2922 void __exit
2923 kiblnd_module_fini (void)
2924 {
2925         lnet_unregister_lnd(&the_o2iblnd);
2926         kiblnd_tunables_fini();
2927 }
2928
2929 int __init
2930 kiblnd_module_init (void)
2931 {
2932         int    rc;
2933
2934         CLASSERT (sizeof(kib_msg_t) <= IBLND_MSG_SIZE);
2935         CLASSERT (offsetof(kib_msg_t, ibm_u.get.ibgm_rd.rd_frags[IBLND_MAX_RDMA_FRAGS])
2936                   <= IBLND_MSG_SIZE);
2937         CLASSERT (offsetof(kib_msg_t, ibm_u.putack.ibpam_rd.rd_frags[IBLND_MAX_RDMA_FRAGS])
2938                   <= IBLND_MSG_SIZE);
2939
2940         rc = kiblnd_tunables_init();
2941         if (rc != 0)
2942                 return rc;
2943
2944         lnet_register_lnd(&the_o2iblnd);
2945
2946         return 0;
2947 }
2948
2949 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
2950 MODULE_DESCRIPTION("Kernel OpenIB gen2 LND v2.00");
2951 MODULE_LICENSE("GPL");
2952
2953 module_init(kiblnd_module_init);
2954 module_exit(kiblnd_module_fini);