drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lnet/klnds/o2iblnd/o2iblnd.c
  33  *
  34  * Author: Eric Barton <eric@bartonsoftware.com>
  35  */
  36
  37 #include <asm/div64.h>
  38 #include <asm/page.h>
  39 #include "o2iblnd.h"
  40
  41 static struct lnet_lnd the_o2iblnd;
  42
  43 struct kib_data kiblnd_data;
  44
  45 static __u32 kiblnd_cksum(void *ptr, int nob)
  46 {
  47         char *c = ptr;
  48         __u32 sum = 0;
  49
  50         while (nob-- > 0)
  51                 sum = ((sum << 1) | (sum >> 31)) + *c++;
  52
  53         /* ensure I don't return 0 (== no checksum) */
  54         return !sum ? 1 : sum;
  55 }
  56
  57 static char *kiblnd_msgtype2str(int type)
  58 {
  59         switch (type) {
  60         case IBLND_MSG_CONNREQ:
  61                 return "CONNREQ";
  62
  63         case IBLND_MSG_CONNACK:
  64                 return "CONNACK";
  65
  66         case IBLND_MSG_NOOP:
  67                 return "NOOP";
  68
  69         case IBLND_MSG_IMMEDIATE:
  70                 return "IMMEDIATE";
  71
  72         case IBLND_MSG_PUT_REQ:
  73                 return "PUT_REQ";
  74
  75         case IBLND_MSG_PUT_NAK:
  76                 return "PUT_NAK";
  77
  78         case IBLND_MSG_PUT_ACK:
  79                 return "PUT_ACK";
  80
  81         case IBLND_MSG_PUT_DONE:
  82                 return "PUT_DONE";
  83
  84         case IBLND_MSG_GET_REQ:
  85                 return "GET_REQ";
  86
  87         case IBLND_MSG_GET_DONE:
  88                 return "GET_DONE";
  89
  90         default:
  91                 return "???";
  92         }
  93 }
  94
  95 static int kiblnd_msgtype2size(int type)
  96 {
  97         const int hdr_size = offsetof(struct kib_msg, ibm_u);
  98
  99         switch (type) {
 100         case IBLND_MSG_CONNREQ:
 101         case IBLND_MSG_CONNACK:
 102                 return hdr_size + sizeof(struct kib_connparams);
 103
 104         case IBLND_MSG_NOOP:
 105                 return hdr_size;
 106
 107         case IBLND_MSG_IMMEDIATE:
 108                 return offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[0]);
 109
 110         case IBLND_MSG_PUT_REQ:
 111                 return hdr_size + sizeof(struct kib_putreq_msg);
 112
 113         case IBLND_MSG_PUT_ACK:
 114                 return hdr_size + sizeof(struct kib_putack_msg);
 115
 116         case IBLND_MSG_GET_REQ:
 117                 return hdr_size + sizeof(struct kib_get_msg);
 118
 119         case IBLND_MSG_PUT_NAK:
 120         case IBLND_MSG_PUT_DONE:
 121         case IBLND_MSG_GET_DONE:
 122                 return hdr_size + sizeof(struct kib_completion_msg);
 123         default:
 124                 return -1;
 125         }
 126 }
 127
 128 static int kiblnd_unpack_rd(struct kib_msg *msg, int flip)
 129 {
 130         struct kib_rdma_desc *rd;
 131         int msg_size;
 132         int nob;
 133         int n;
 134         int i;
 135
 136         LASSERT(msg->ibm_type == IBLND_MSG_GET_REQ ||
 137                 msg->ibm_type == IBLND_MSG_PUT_ACK);
 138
 139         rd = msg->ibm_type == IBLND_MSG_GET_REQ ?
 140                               &msg->ibm_u.get.ibgm_rd :
 141                               &msg->ibm_u.putack.ibpam_rd;
 142
 143         if (flip) {
 144                 __swab32s(&rd->rd_key);
 145                 __swab32s(&rd->rd_nfrags);
 146         }
 147
 148         n = rd->rd_nfrags;
 149
 150         nob = offsetof(struct kib_msg, ibm_u) +
 151               kiblnd_rd_msg_size(rd, msg->ibm_type, n);
 152
 153         if (msg->ibm_nob < nob) {
 154                 CERROR("Short %s: %d(%d)\n",
 155                        kiblnd_msgtype2str(msg->ibm_type), msg->ibm_nob, nob);
 156                 return 1;
 157         }
 158
 159         msg_size = kiblnd_rd_size(rd);
 160         if (msg_size <= 0 || msg_size > LNET_MAX_PAYLOAD) {
 161                 CERROR("Bad msg_size: %d, should be 0 < n <= %d\n",
 162                        msg_size, LNET_MAX_PAYLOAD);
 163                 return 1;
 164         }
 165
 166         if (!flip)
 167                 return 0;
 168
 169         for (i = 0; i < n; i++) {
 170                 __swab32s(&rd->rd_frags[i].rf_nob);
 171                 __swab64s(&rd->rd_frags[i].rf_addr);
 172         }
 173
 174         return 0;
 175 }
 176
 177 void kiblnd_pack_msg(struct lnet_ni *ni, struct kib_msg *msg, int version,
 178                      int credits, lnet_nid_t dstnid, __u64 dststamp)
 179 {
 180         struct kib_net *net = ni->ni_data;
 181
 182         /*
 183          * CAVEAT EMPTOR! all message fields not set here should have been
 184          * initialised previously.
 185          */
 186         msg->ibm_magic    = IBLND_MSG_MAGIC;
 187         msg->ibm_version  = version;
 188         /*   ibm_type */
 189         msg->ibm_credits  = credits;
 190         /*   ibm_nob */
 191         msg->ibm_cksum    = 0;
 192         msg->ibm_srcnid   = ni->ni_nid;
 193         msg->ibm_srcstamp = net->ibn_incarnation;
 194         msg->ibm_dstnid   = dstnid;
 195         msg->ibm_dststamp = dststamp;
 196
 197         if (*kiblnd_tunables.kib_cksum) {
 198                 /* NB ibm_cksum zero while computing cksum */
 199                 msg->ibm_cksum = kiblnd_cksum(msg, msg->ibm_nob);
 200         }
 201 }
 202
 203 int kiblnd_unpack_msg(struct kib_msg *msg, int nob)
 204 {
 205         const int hdr_size = offsetof(struct kib_msg, ibm_u);
 206         __u32 msg_cksum;
 207         __u16 version;
 208         int msg_nob;
 209         int flip;
 210
 211         /* 6 bytes are enough to have received magic + version */
 212         if (nob < 6) {
 213                 CERROR("Short message: %d\n", nob);
 214                 return -EPROTO;
 215         }
 216
 217         if (msg->ibm_magic == IBLND_MSG_MAGIC) {
 218                 flip = 0;
 219         } else if (msg->ibm_magic == __swab32(IBLND_MSG_MAGIC)) {
 220                 flip = 1;
 221         } else {
 222                 CERROR("Bad magic: %08x\n", msg->ibm_magic);
 223                 return -EPROTO;
 224         }
 225
 226         version = flip ? __swab16(msg->ibm_version) : msg->ibm_version;
 227         if (version != IBLND_MSG_VERSION &&
 228             version != IBLND_MSG_VERSION_1) {
 229                 CERROR("Bad version: %x\n", version);
 230                 return -EPROTO;
 231         }
 232
 233         if (nob < hdr_size) {
 234                 CERROR("Short message: %d\n", nob);
 235                 return -EPROTO;
 236         }
 237
 238         msg_nob = flip ? __swab32(msg->ibm_nob) : msg->ibm_nob;
 239         if (msg_nob > nob) {
 240                 CERROR("Short message: got %d, wanted %d\n", nob, msg_nob);
 241                 return -EPROTO;
 242         }
 243
 244         /*
 245          * checksum must be computed with ibm_cksum zero and BEFORE anything
 246          * gets flipped
 247          */
 248         msg_cksum = flip ? __swab32(msg->ibm_cksum) : msg->ibm_cksum;
 249         msg->ibm_cksum = 0;
 250         if (msg_cksum &&
 251             msg_cksum != kiblnd_cksum(msg, msg_nob)) {
 252                 CERROR("Bad checksum\n");
 253                 return -EPROTO;
 254         }
 255
 256         msg->ibm_cksum = msg_cksum;
 257
 258         if (flip) {
 259                 /* leave magic unflipped as a clue to peer endianness */
 260                 msg->ibm_version = version;
 261                 BUILD_BUG_ON(sizeof(msg->ibm_type) != 1);
 262                 BUILD_BUG_ON(sizeof(msg->ibm_credits) != 1);
 263                 msg->ibm_nob     = msg_nob;
 264                 __swab64s(&msg->ibm_srcnid);
 265                 __swab64s(&msg->ibm_srcstamp);
 266                 __swab64s(&msg->ibm_dstnid);
 267                 __swab64s(&msg->ibm_dststamp);
 268         }
 269
 270         if (msg->ibm_srcnid == LNET_NID_ANY) {
 271                 CERROR("Bad src nid: %s\n", libcfs_nid2str(msg->ibm_srcnid));
 272                 return -EPROTO;
 273         }
 274
 275         if (msg_nob < kiblnd_msgtype2size(msg->ibm_type)) {
 276                 CERROR("Short %s: %d(%d)\n", kiblnd_msgtype2str(msg->ibm_type),
 277                        msg_nob, kiblnd_msgtype2size(msg->ibm_type));
 278                 return -EPROTO;
 279         }
 280
 281         switch (msg->ibm_type) {
 282         default:
 283                 CERROR("Unknown message type %x\n", msg->ibm_type);
 284                 return -EPROTO;
 285
 286         case IBLND_MSG_NOOP:
 287         case IBLND_MSG_IMMEDIATE:
 288         case IBLND_MSG_PUT_REQ:
 289                 break;
 290
 291         case IBLND_MSG_PUT_ACK:
 292         case IBLND_MSG_GET_REQ:
 293                 if (kiblnd_unpack_rd(msg, flip))
 294                         return -EPROTO;
 295                 break;
 296
 297         case IBLND_MSG_PUT_NAK:
 298         case IBLND_MSG_PUT_DONE:
 299         case IBLND_MSG_GET_DONE:
 300                 if (flip)
 301                         __swab32s(&msg->ibm_u.completion.ibcm_status);
 302                 break;
 303
 304         case IBLND_MSG_CONNREQ:
 305         case IBLND_MSG_CONNACK:
 306                 if (flip) {
 307                         __swab16s(&msg->ibm_u.connparams.ibcp_queue_depth);
 308                         __swab16s(&msg->ibm_u.connparams.ibcp_max_frags);
 309                         __swab32s(&msg->ibm_u.connparams.ibcp_max_msg_size);
 310                 }
 311                 break;
 312         }
 313         return 0;
 314 }
 315
 316 int kiblnd_create_peer(struct lnet_ni *ni, struct kib_peer **peerp,
 317                        lnet_nid_t nid)
 318 {
 319         struct kib_peer *peer;
 320         struct kib_net *net = ni->ni_data;
 321         int cpt = lnet_cpt_of_nid(nid);
 322         unsigned long flags;
 323
 324         LASSERT(net);
 325         LASSERT(nid != LNET_NID_ANY);
 326
 327         LIBCFS_CPT_ALLOC(peer, lnet_cpt_table(), cpt, sizeof(*peer));
 328         if (!peer) {
 329                 CERROR("Cannot allocate peer\n");
 330                 return -ENOMEM;
 331         }
 332
 333         peer->ibp_ni = ni;
 334         peer->ibp_nid = nid;
 335         peer->ibp_error = 0;
 336         peer->ibp_last_alive = 0;
 337         peer->ibp_max_frags = kiblnd_cfg_rdma_frags(peer->ibp_ni);
 338         peer->ibp_queue_depth = ni->ni_peertxcredits;
 339         atomic_set(&peer->ibp_refcount, 1);  /* 1 ref for caller */
 340
 341         INIT_LIST_HEAD(&peer->ibp_list);     /* not in the peer table yet */
 342         INIT_LIST_HEAD(&peer->ibp_conns);
 343         INIT_LIST_HEAD(&peer->ibp_tx_queue);
 344
 345         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 346
 347         /* always called with a ref on ni, which prevents ni being shutdown */
 348         LASSERT(!net->ibn_shutdown);
 349
 350         /* npeers only grows with the global lock held */
 351         atomic_inc(&net->ibn_npeers);
 352
 353         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 354
 355         *peerp = peer;
 356         return 0;
 357 }
 358
 359 void kiblnd_destroy_peer(struct kib_peer *peer)
 360 {
 361         struct kib_net *net = peer->ibp_ni->ni_data;
 362
 363         LASSERT(net);
 364         LASSERT(!atomic_read(&peer->ibp_refcount));
 365         LASSERT(!kiblnd_peer_active(peer));
 366         LASSERT(kiblnd_peer_idle(peer));
 367         LASSERT(list_empty(&peer->ibp_tx_queue));
 368
 369         LIBCFS_FREE(peer, sizeof(*peer));
 370
 371         /*
 372          * NB a peer's connections keep a reference on their peer until
 373          * they are destroyed, so we can be assured that _all_ state to do
 374          * with this peer has been cleaned up when its refcount drops to
 375          * zero.
 376          */
 377         atomic_dec(&net->ibn_npeers);
 378 }
 379
 380 struct kib_peer *kiblnd_find_peer_locked(lnet_nid_t nid)
 381 {
 382         /*
 383          * the caller is responsible for accounting the additional reference
 384          * that this creates
 385          */
 386         struct list_head *peer_list = kiblnd_nid2peerlist(nid);
 387         struct list_head *tmp;
 388         struct kib_peer *peer;
 389
 390         list_for_each(tmp, peer_list) {
 391                 peer = list_entry(tmp, struct kib_peer, ibp_list);
 392                 LASSERT(!kiblnd_peer_idle(peer));
 393
 394                 if (peer->ibp_nid != nid)
 395                         continue;
 396
 397                 CDEBUG(D_NET, "got peer [%p] -> %s (%d) version: %x\n",
 398                        peer, libcfs_nid2str(nid),
 399                        atomic_read(&peer->ibp_refcount),
 400                        peer->ibp_version);
 401                 return peer;
 402         }
 403         return NULL;
 404 }
 405
 406 void kiblnd_unlink_peer_locked(struct kib_peer *peer)
 407 {
 408         LASSERT(list_empty(&peer->ibp_conns));
 409
 410         LASSERT(kiblnd_peer_active(peer));
 411         list_del_init(&peer->ibp_list);
 412         /* lose peerlist's ref */
 413         kiblnd_peer_decref(peer);
 414 }
 415
 416 static int kiblnd_get_peer_info(struct lnet_ni *ni, int index,
 417                                 lnet_nid_t *nidp, int *count)
 418 {
 419         struct kib_peer *peer;
 420         struct list_head *ptmp;
 421         int i;
 422         unsigned long flags;
 423
 424         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 425
 426         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
 427                 list_for_each(ptmp, &kiblnd_data.kib_peers[i]) {
 428                         peer = list_entry(ptmp, struct kib_peer, ibp_list);
 429                         LASSERT(!kiblnd_peer_idle(peer));
 430
 431                         if (peer->ibp_ni != ni)
 432                                 continue;
 433
 434                         if (index-- > 0)
 435                                 continue;
 436
 437                         *nidp = peer->ibp_nid;
 438                         *count = atomic_read(&peer->ibp_refcount);
 439
 440                         read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
 441                                                flags);
 442                         return 0;
 443                 }
 444         }
 445
 446         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 447         return -ENOENT;
 448 }
 449
 450 static void kiblnd_del_peer_locked(struct kib_peer *peer)
 451 {
 452         struct list_head *ctmp;
 453         struct list_head *cnxt;
 454         struct kib_conn *conn;
 455
 456         if (list_empty(&peer->ibp_conns)) {
 457                 kiblnd_unlink_peer_locked(peer);
 458         } else {
 459                 list_for_each_safe(ctmp, cnxt, &peer->ibp_conns) {
 460                         conn = list_entry(ctmp, struct kib_conn, ibc_list);
 461
 462                         kiblnd_close_conn_locked(conn, 0);
 463                 }
 464                 /* NB closing peer's last conn unlinked it. */
 465         }
 466         /*
 467          * NB peer now unlinked; might even be freed if the peer table had the
 468          * last ref on it.
 469          */
 470 }
 471
 472 static int kiblnd_del_peer(struct lnet_ni *ni, lnet_nid_t nid)
 473 {
 474         LIST_HEAD(zombies);
 475         struct list_head *ptmp;
 476         struct list_head *pnxt;
 477         struct kib_peer *peer;
 478         int lo;
 479         int hi;
 480         int i;
 481         unsigned long flags;
 482         int rc = -ENOENT;
 483
 484         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 485
 486         if (nid != LNET_NID_ANY) {
 487                 lo = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
 488                 hi = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
 489         } else {
 490                 lo = 0;
 491                 hi = kiblnd_data.kib_peer_hash_size - 1;
 492         }
 493
 494         for (i = lo; i <= hi; i++) {
 495                 list_for_each_safe(ptmp, pnxt, &kiblnd_data.kib_peers[i]) {
 496                         peer = list_entry(ptmp, struct kib_peer, ibp_list);
 497                         LASSERT(!kiblnd_peer_idle(peer));
 498
 499                         if (peer->ibp_ni != ni)
 500                                 continue;
 501
 502                         if (!(nid == LNET_NID_ANY || peer->ibp_nid == nid))
 503                                 continue;
 504
 505                         if (!list_empty(&peer->ibp_tx_queue)) {
 506                                 LASSERT(list_empty(&peer->ibp_conns));
 507
 508                                 list_splice_init(&peer->ibp_tx_queue,
 509                                                  &zombies);
 510                         }
 511
 512                         kiblnd_del_peer_locked(peer);
 513                         rc = 0;  /* matched something */
 514                 }
 515         }
 516
 517         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 518
 519         kiblnd_txlist_done(ni, &zombies, -EIO);
 520
 521         return rc;
 522 }
 523
 524 static struct kib_conn *kiblnd_get_conn_by_idx(struct lnet_ni *ni, int index)
 525 {
 526         struct kib_peer *peer;
 527         struct list_head *ptmp;
 528         struct kib_conn *conn;
 529         struct list_head *ctmp;
 530         int i;
 531         unsigned long flags;
 532
 533         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 534
 535         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
 536                 list_for_each(ptmp, &kiblnd_data.kib_peers[i]) {
 537                         peer = list_entry(ptmp, struct kib_peer, ibp_list);
 538                         LASSERT(!kiblnd_peer_idle(peer));
 539
 540                         if (peer->ibp_ni != ni)
 541                                 continue;
 542
 543                         list_for_each(ctmp, &peer->ibp_conns) {
 544                                 if (index-- > 0)
 545                                         continue;
 546
 547                                 conn = list_entry(ctmp, struct kib_conn,
 548                                                   ibc_list);
 549                                 kiblnd_conn_addref(conn);
 550                                 read_unlock_irqrestore(
 551                                         &kiblnd_data.kib_global_lock,
 552                                         flags);
 553                                 return conn;
 554                         }
 555                 }
 556         }
 557
 558         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 559         return NULL;
 560 }
 561
 562 int kiblnd_translate_mtu(int value)
 563 {
 564         switch (value) {
 565         default:
 566                 return -1;
 567         case 0:
 568                 return 0;
 569         case 256:
 570                 return IB_MTU_256;
 571         case 512:
 572                 return IB_MTU_512;
 573         case 1024:
 574                 return IB_MTU_1024;
 575         case 2048:
 576                 return IB_MTU_2048;
 577         case 4096:
 578                 return IB_MTU_4096;
 579         }
 580 }
 581
 582 static void kiblnd_setup_mtu_locked(struct rdma_cm_id *cmid)
 583 {
 584         int mtu;
 585
 586         /* XXX There is no path record for iWARP, set by netdev->change_mtu? */
 587         if (!cmid->route.path_rec)
 588                 return;
 589
 590         mtu = kiblnd_translate_mtu(*kiblnd_tunables.kib_ib_mtu);
 591         LASSERT(mtu >= 0);
 592         if (mtu)
 593                 cmid->route.path_rec->mtu = mtu;
 594 }
 595
 596 static int kiblnd_get_completion_vector(struct kib_conn *conn, int cpt)
 597 {
 598         cpumask_t *mask;
 599         int vectors;
 600         int off;
 601         int i;
 602         lnet_nid_t nid = conn->ibc_peer->ibp_nid;
 603
 604         vectors = conn->ibc_cmid->device->num_comp_vectors;
 605         if (vectors <= 1)
 606                 return 0;
 607
 608         mask = cfs_cpt_cpumask(lnet_cpt_table(), cpt);
 609         if (!mask)
 610                 return 0;
 611
 612         /* hash NID to CPU id in this partition... */
 613         off = do_div(nid, cpumask_weight(mask));
 614         for_each_cpu(i, mask) {
 615                 if (!off--)
 616                         return i % vectors;
 617         }
 618
 619         LBUG();
 620         return 1;
 621 }
 622
 623 struct kib_conn *kiblnd_create_conn(struct kib_peer *peer, struct rdma_cm_id *cmid,
 624                                     int state, int version)
 625 {
 626         /*
 627          * CAVEAT EMPTOR:
 628          * If the new conn is created successfully it takes over the caller's
 629          * ref on 'peer'.  It also "owns" 'cmid' and destroys it when it itself
 630          * is destroyed.  On failure, the caller's ref on 'peer' remains and
 631          * she must dispose of 'cmid'.  (Actually I'd block forever if I tried
 632          * to destroy 'cmid' here since I'm called from the CM which still has
 633          * its ref on 'cmid').
 634          */
 635         rwlock_t *glock = &kiblnd_data.kib_global_lock;
 636         struct kib_net *net = peer->ibp_ni->ni_data;
 637         struct kib_dev *dev;
 638         struct ib_qp_init_attr *init_qp_attr;
 639         struct kib_sched_info *sched;
 640         struct ib_cq_init_attr cq_attr = {};
 641         struct kib_conn *conn;
 642         struct ib_cq *cq;
 643         unsigned long flags;
 644         int cpt;
 645         int rc;
 646         int i;
 647
 648         LASSERT(net);
 649         LASSERT(!in_interrupt());
 650
 651         dev = net->ibn_dev;
 652
 653         cpt = lnet_cpt_of_nid(peer->ibp_nid);
 654         sched = kiblnd_data.kib_scheds[cpt];
 655
 656         LASSERT(sched->ibs_nthreads > 0);
 657
 658         LIBCFS_CPT_ALLOC(init_qp_attr, lnet_cpt_table(), cpt,
 659                          sizeof(*init_qp_attr));
 660         if (!init_qp_attr) {
 661                 CERROR("Can't allocate qp_attr for %s\n",
 662                        libcfs_nid2str(peer->ibp_nid));
 663                 goto failed_0;
 664         }
 665
 666         LIBCFS_CPT_ALLOC(conn, lnet_cpt_table(), cpt, sizeof(*conn));
 667         if (!conn) {
 668                 CERROR("Can't allocate connection for %s\n",
 669                        libcfs_nid2str(peer->ibp_nid));
 670                 goto failed_1;
 671         }
 672
 673         conn->ibc_state = IBLND_CONN_INIT;
 674         conn->ibc_version = version;
 675         conn->ibc_peer = peer;            /* I take the caller's ref */
 676         cmid->context = conn;              /* for future CM callbacks */
 677         conn->ibc_cmid = cmid;
 678         conn->ibc_max_frags = peer->ibp_max_frags;
 679         conn->ibc_queue_depth = peer->ibp_queue_depth;
 680
 681         INIT_LIST_HEAD(&conn->ibc_early_rxs);
 682         INIT_LIST_HEAD(&conn->ibc_tx_noops);
 683         INIT_LIST_HEAD(&conn->ibc_tx_queue);
 684         INIT_LIST_HEAD(&conn->ibc_tx_queue_rsrvd);
 685         INIT_LIST_HEAD(&conn->ibc_tx_queue_nocred);
 686         INIT_LIST_HEAD(&conn->ibc_active_txs);
 687         spin_lock_init(&conn->ibc_lock);
 688
 689         LIBCFS_CPT_ALLOC(conn->ibc_connvars, lnet_cpt_table(), cpt,
 690                          sizeof(*conn->ibc_connvars));
 691         if (!conn->ibc_connvars) {
 692                 CERROR("Can't allocate in-progress connection state\n");
 693                 goto failed_2;
 694         }
 695
 696         write_lock_irqsave(glock, flags);
 697         if (dev->ibd_failover) {
 698                 write_unlock_irqrestore(glock, flags);
 699                 CERROR("%s: failover in progress\n", dev->ibd_ifname);
 700                 goto failed_2;
 701         }
 702
 703         if (dev->ibd_hdev->ibh_ibdev != cmid->device) {
 704                 /* wakeup failover thread and teardown connection */
 705                 if (kiblnd_dev_can_failover(dev)) {
 706                         list_add_tail(&dev->ibd_fail_list,
 707                                       &kiblnd_data.kib_failed_devs);
 708                         wake_up(&kiblnd_data.kib_failover_waitq);
 709                 }
 710
 711                 write_unlock_irqrestore(glock, flags);
 712                 CERROR("cmid HCA(%s), kib_dev(%s) need failover\n",
 713                        cmid->device->name, dev->ibd_ifname);
 714                 goto failed_2;
 715         }
 716
 717         kiblnd_hdev_addref_locked(dev->ibd_hdev);
 718         conn->ibc_hdev = dev->ibd_hdev;
 719
 720         kiblnd_setup_mtu_locked(cmid);
 721
 722         write_unlock_irqrestore(glock, flags);
 723
 724         LIBCFS_CPT_ALLOC(conn->ibc_rxs, lnet_cpt_table(), cpt,
 725                          IBLND_RX_MSGS(conn) * sizeof(struct kib_rx));
 726         if (!conn->ibc_rxs) {
 727                 CERROR("Cannot allocate RX buffers\n");
 728                 goto failed_2;
 729         }
 730
 731         rc = kiblnd_alloc_pages(&conn->ibc_rx_pages, cpt,
 732                                 IBLND_RX_MSG_PAGES(conn));
 733         if (rc)
 734                 goto failed_2;
 735
 736         kiblnd_map_rx_descs(conn);
 737
 738         cq_attr.cqe = IBLND_CQ_ENTRIES(conn);
 739         cq_attr.comp_vector = kiblnd_get_completion_vector(conn, cpt);
 740         cq = ib_create_cq(cmid->device,
 741                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 742                           &cq_attr);
 743         if (IS_ERR(cq)) {
 744                 CERROR("Failed to create CQ with %d CQEs: %ld\n",
 745                        IBLND_CQ_ENTRIES(conn), PTR_ERR(cq));
 746                 goto failed_2;
 747         }
 748
 749         conn->ibc_cq = cq;
 750
 751         rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 752         if (rc) {
 753                 CERROR("Can't request completion notification: %d\n", rc);
 754                 goto failed_2;
 755         }
 756
 757         init_qp_attr->event_handler = kiblnd_qp_event;
 758         init_qp_attr->qp_context = conn;
 759         init_qp_attr->cap.max_send_wr = IBLND_SEND_WRS(conn);
 760         init_qp_attr->cap.max_recv_wr = IBLND_RECV_WRS(conn);
 761         init_qp_attr->cap.max_send_sge = 1;
 762         init_qp_attr->cap.max_recv_sge = 1;
 763         init_qp_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
 764         init_qp_attr->qp_type = IB_QPT_RC;
 765         init_qp_attr->send_cq = cq;
 766         init_qp_attr->recv_cq = cq;
 767
 768         conn->ibc_sched = sched;
 769
 770         rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd, init_qp_attr);
 771         if (rc) {
 772                 CERROR("Can't create QP: %d, send_wr: %d, recv_wr: %d\n",
 773                        rc, init_qp_attr->cap.max_send_wr,
 774                        init_qp_attr->cap.max_recv_wr);
 775                 goto failed_2;
 776         }
 777
 778         LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
 779
 780         /* 1 ref for caller and each rxmsg */
 781         atomic_set(&conn->ibc_refcount, 1 + IBLND_RX_MSGS(conn));
 782         conn->ibc_nrx = IBLND_RX_MSGS(conn);
 783
 784         /* post receives */
 785         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
 786                 rc = kiblnd_post_rx(&conn->ibc_rxs[i],
 787                                     IBLND_POSTRX_NO_CREDIT);
 788                 if (rc) {
 789                         CERROR("Can't post rxmsg: %d\n", rc);
 790
 791                         /* Make posted receives complete */
 792                         kiblnd_abort_receives(conn);
 793
 794                         /*
 795                          * correct # of posted buffers
 796                          * NB locking needed now I'm racing with completion
 797                          */
 798                         spin_lock_irqsave(&sched->ibs_lock, flags);
 799                         conn->ibc_nrx -= IBLND_RX_MSGS(conn) - i;
 800                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
 801
 802                         /*
 803                          * cmid will be destroyed by CM(ofed) after cm_callback
 804                          * returned, so we can't refer it anymore
 805                          * (by kiblnd_connd()->kiblnd_destroy_conn)
 806                          */
 807                         rdma_destroy_qp(conn->ibc_cmid);
 808                         conn->ibc_cmid = NULL;
 809
 810                         /* Drop my own and unused rxbuffer refcounts */
 811                         while (i++ <= IBLND_RX_MSGS(conn))
 812                                 kiblnd_conn_decref(conn);
 813
 814                         return NULL;
 815                 }
 816         }
 817
 818         /* Init successful! */
 819         LASSERT(state == IBLND_CONN_ACTIVE_CONNECT ||
 820                 state == IBLND_CONN_PASSIVE_WAIT);
 821         conn->ibc_state = state;
 822
 823         /* 1 more conn */
 824         atomic_inc(&net->ibn_nconns);
 825         return conn;
 826
 827  failed_2:
 828         kiblnd_destroy_conn(conn);
 829         LIBCFS_FREE(conn, sizeof(*conn));
 830  failed_1:
 831         LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
 832  failed_0:
 833         return NULL;
 834 }
 835
 836 void kiblnd_destroy_conn(struct kib_conn *conn)
 837 {
 838         struct rdma_cm_id *cmid = conn->ibc_cmid;
 839         struct kib_peer *peer = conn->ibc_peer;
 840         int rc;
 841
 842         LASSERT(!in_interrupt());
 843         LASSERT(!atomic_read(&conn->ibc_refcount));
 844         LASSERT(list_empty(&conn->ibc_early_rxs));
 845         LASSERT(list_empty(&conn->ibc_tx_noops));
 846         LASSERT(list_empty(&conn->ibc_tx_queue));
 847         LASSERT(list_empty(&conn->ibc_tx_queue_rsrvd));
 848         LASSERT(list_empty(&conn->ibc_tx_queue_nocred));
 849         LASSERT(list_empty(&conn->ibc_active_txs));
 850         LASSERT(!conn->ibc_noops_posted);
 851         LASSERT(!conn->ibc_nsends_posted);
 852
 853         switch (conn->ibc_state) {
 854         default:
 855                 /* conn must be completely disengaged from the network */
 856                 LBUG();
 857
 858         case IBLND_CONN_DISCONNECTED:
 859                 /* connvars should have been freed already */
 860                 LASSERT(!conn->ibc_connvars);
 861                 break;
 862
 863         case IBLND_CONN_INIT:
 864                 break;
 865         }
 866
 867         /* conn->ibc_cmid might be destroyed by CM already */
 868         if (cmid && cmid->qp)
 869                 rdma_destroy_qp(cmid);
 870
 871         if (conn->ibc_cq) {
 872                 rc = ib_destroy_cq(conn->ibc_cq);
 873                 if (rc)
 874                         CWARN("Error destroying CQ: %d\n", rc);
 875         }
 876
 877         if (conn->ibc_rx_pages)
 878                 kiblnd_unmap_rx_descs(conn);
 879
 880         if (conn->ibc_rxs) {
 881                 LIBCFS_FREE(conn->ibc_rxs,
 882                             IBLND_RX_MSGS(conn) * sizeof(struct kib_rx));
 883         }
 884
 885         if (conn->ibc_connvars)
 886                 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
 887
 888         if (conn->ibc_hdev)
 889                 kiblnd_hdev_decref(conn->ibc_hdev);
 890
 891         /* See CAVEAT EMPTOR above in kiblnd_create_conn */
 892         if (conn->ibc_state != IBLND_CONN_INIT) {
 893                 struct kib_net *net = peer->ibp_ni->ni_data;
 894
 895                 kiblnd_peer_decref(peer);
 896                 rdma_destroy_id(cmid);
 897                 atomic_dec(&net->ibn_nconns);
 898         }
 899 }
 900
 901 int kiblnd_close_peer_conns_locked(struct kib_peer *peer, int why)
 902 {
 903         struct kib_conn *conn;
 904         struct list_head *ctmp;
 905         struct list_head *cnxt;
 906         int count = 0;
 907
 908         list_for_each_safe(ctmp, cnxt, &peer->ibp_conns) {
 909                 conn = list_entry(ctmp, struct kib_conn, ibc_list);
 910
 911                 CDEBUG(D_NET, "Closing conn -> %s, version: %x, reason: %d\n",
 912                        libcfs_nid2str(peer->ibp_nid),
 913                        conn->ibc_version, why);
 914
 915                 kiblnd_close_conn_locked(conn, why);
 916                 count++;
 917         }
 918
 919         return count;
 920 }
 921
 922 int kiblnd_close_stale_conns_locked(struct kib_peer *peer,
 923                                     int version, __u64 incarnation)
 924 {
 925         struct kib_conn *conn;
 926         struct list_head *ctmp;
 927         struct list_head *cnxt;
 928         int count = 0;
 929
 930         list_for_each_safe(ctmp, cnxt, &peer->ibp_conns) {
 931                 conn = list_entry(ctmp, struct kib_conn, ibc_list);
 932
 933                 if (conn->ibc_version     == version &&
 934                     conn->ibc_incarnation == incarnation)
 935                         continue;
 936
 937                 CDEBUG(D_NET,
 938                        "Closing stale conn -> %s version: %x, incarnation:%#llx(%x, %#llx)\n",
 939                        libcfs_nid2str(peer->ibp_nid),
 940                        conn->ibc_version, conn->ibc_incarnation,
 941                        version, incarnation);
 942
 943                 kiblnd_close_conn_locked(conn, -ESTALE);
 944                 count++;
 945         }
 946
 947         return count;
 948 }
 949
 950 static int kiblnd_close_matching_conns(struct lnet_ni *ni, lnet_nid_t nid)
 951 {
 952         struct kib_peer *peer;
 953         struct list_head *ptmp;
 954         struct list_head *pnxt;
 955         int lo;
 956         int hi;
 957         int i;
 958         unsigned long flags;
 959         int count = 0;
 960
 961         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 962
 963         if (nid != LNET_NID_ANY) {
 964                 lo = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
 965                 hi = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
 966         } else {
 967                 lo = 0;
 968                 hi = kiblnd_data.kib_peer_hash_size - 1;
 969         }
 970
 971         for (i = lo; i <= hi; i++) {
 972                 list_for_each_safe(ptmp, pnxt, &kiblnd_data.kib_peers[i]) {
 973                         peer = list_entry(ptmp, struct kib_peer, ibp_list);
 974                         LASSERT(!kiblnd_peer_idle(peer));
 975
 976                         if (peer->ibp_ni != ni)
 977                                 continue;
 978
 979                         if (!(nid == LNET_NID_ANY || nid == peer->ibp_nid))
 980                                 continue;
 981
 982                         count += kiblnd_close_peer_conns_locked(peer, 0);
 983                 }
 984         }
 985
 986         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 987
 988         /* wildcards always succeed */
 989         if (nid == LNET_NID_ANY)
 990                 return 0;
 991
 992         return !count ? -ENOENT : 0;
 993 }
 994
 995 static int kiblnd_ctl(struct lnet_ni *ni, unsigned int cmd, void *arg)
 996 {
 997         struct libcfs_ioctl_data *data = arg;
 998         int rc = -EINVAL;
 999
1000         switch (cmd) {
1001         case IOC_LIBCFS_GET_PEER: {
1002                 lnet_nid_t nid = 0;
1003                 int count = 0;
1004
1005                 rc = kiblnd_get_peer_info(ni, data->ioc_count,
1006                                           &nid, &count);
1007                 data->ioc_nid   = nid;
1008                 data->ioc_count = count;
1009                 break;
1010         }
1011
1012         case IOC_LIBCFS_DEL_PEER: {
1013                 rc = kiblnd_del_peer(ni, data->ioc_nid);
1014                 break;
1015         }
1016         case IOC_LIBCFS_GET_CONN: {
1017                 struct kib_conn *conn;
1018
1019                 rc = 0;
1020                 conn = kiblnd_get_conn_by_idx(ni, data->ioc_count);
1021                 if (!conn) {
1022                         rc = -ENOENT;
1023                         break;
1024                 }
1025
1026                 LASSERT(conn->ibc_cmid);
1027                 data->ioc_nid = conn->ibc_peer->ibp_nid;
1028                 if (!conn->ibc_cmid->route.path_rec)
1029                         data->ioc_u32[0] = 0; /* iWarp has no path MTU */
1030                 else
1031                         data->ioc_u32[0] =
1032                         ib_mtu_enum_to_int(conn->ibc_cmid->route.path_rec->mtu);
1033                 kiblnd_conn_decref(conn);
1034                 break;
1035         }
1036         case IOC_LIBCFS_CLOSE_CONNECTION: {
1037                 rc = kiblnd_close_matching_conns(ni, data->ioc_nid);
1038                 break;
1039         }
1040
1041         default:
1042                 break;
1043         }
1044
1045         return rc;
1046 }
1047
1048 static void kiblnd_query(struct lnet_ni *ni, lnet_nid_t nid,
1049                          unsigned long *when)
1050 {
1051         unsigned long last_alive = 0;
1052         unsigned long now = cfs_time_current();
1053         rwlock_t *glock = &kiblnd_data.kib_global_lock;
1054         struct kib_peer *peer;
1055         unsigned long flags;
1056
1057         read_lock_irqsave(glock, flags);
1058
1059         peer = kiblnd_find_peer_locked(nid);
1060         if (peer)
1061                 last_alive = peer->ibp_last_alive;
1062
1063         read_unlock_irqrestore(glock, flags);
1064
1065         if (last_alive)
1066                 *when = last_alive;
1067
1068         /*
1069          * peer is not persistent in hash, trigger peer creation
1070          * and connection establishment with a NULL tx
1071          */
1072         if (!peer)
1073                 kiblnd_launch_tx(ni, NULL, nid);
1074
1075         CDEBUG(D_NET, "Peer %s %p, alive %ld secs ago\n",
1076                libcfs_nid2str(nid), peer,
1077                last_alive ? cfs_duration_sec(now - last_alive) : -1);
1078 }
1079
1080 static void kiblnd_free_pages(struct kib_pages *p)
1081 {
1082         int npages = p->ibp_npages;
1083         int i;
1084
1085         for (i = 0; i < npages; i++) {
1086                 if (p->ibp_pages[i])
1087                         __free_page(p->ibp_pages[i]);
1088         }
1089
1090         LIBCFS_FREE(p, offsetof(struct kib_pages, ibp_pages[npages]));
1091 }
1092
1093 int kiblnd_alloc_pages(struct kib_pages **pp, int cpt, int npages)
1094 {
1095         struct kib_pages *p;
1096         int i;
1097
1098         LIBCFS_CPT_ALLOC(p, lnet_cpt_table(), cpt,
1099                          offsetof(struct kib_pages, ibp_pages[npages]));
1100         if (!p) {
1101                 CERROR("Can't allocate descriptor for %d pages\n", npages);
1102                 return -ENOMEM;
1103         }
1104
1105         memset(p, 0, offsetof(struct kib_pages, ibp_pages[npages]));
1106         p->ibp_npages = npages;
1107
1108         for (i = 0; i < npages; i++) {
1109                 p->ibp_pages[i] = alloc_pages_node(
1110                                     cfs_cpt_spread_node(lnet_cpt_table(), cpt),
1111                                     GFP_NOFS, 0);
1112                 if (!p->ibp_pages[i]) {
1113                         CERROR("Can't allocate page %d of %d\n", i, npages);
1114                         kiblnd_free_pages(p);
1115                         return -ENOMEM;
1116                 }
1117         }
1118
1119         *pp = p;
1120         return 0;
1121 }
1122
1123 void kiblnd_unmap_rx_descs(struct kib_conn *conn)
1124 {
1125         struct kib_rx *rx;
1126         int i;
1127
1128         LASSERT(conn->ibc_rxs);
1129         LASSERT(conn->ibc_hdev);
1130
1131         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
1132                 rx = &conn->ibc_rxs[i];
1133
1134                 LASSERT(rx->rx_nob >= 0); /* not posted */
1135
1136                 kiblnd_dma_unmap_single(conn->ibc_hdev->ibh_ibdev,
1137                                         KIBLND_UNMAP_ADDR(rx, rx_msgunmap,
1138                                                           rx->rx_msgaddr),
1139                                         IBLND_MSG_SIZE, DMA_FROM_DEVICE);
1140         }
1141
1142         kiblnd_free_pages(conn->ibc_rx_pages);
1143
1144         conn->ibc_rx_pages = NULL;
1145 }
1146
1147 void kiblnd_map_rx_descs(struct kib_conn *conn)
1148 {
1149         struct kib_rx *rx;
1150         struct page *pg;
1151         int pg_off;
1152         int ipg;
1153         int i;
1154
1155         for (pg_off = ipg = i = 0; i < IBLND_RX_MSGS(conn); i++) {
1156                 pg = conn->ibc_rx_pages->ibp_pages[ipg];
1157                 rx = &conn->ibc_rxs[i];
1158
1159                 rx->rx_conn = conn;
1160                 rx->rx_msg = (struct kib_msg *)(((char *)page_address(pg)) + pg_off);
1161
1162                 rx->rx_msgaddr = kiblnd_dma_map_single(conn->ibc_hdev->ibh_ibdev,
1163                                                        rx->rx_msg,
1164                                                        IBLND_MSG_SIZE,
1165                                                        DMA_FROM_DEVICE);
1166                 LASSERT(!kiblnd_dma_mapping_error(conn->ibc_hdev->ibh_ibdev,
1167                                                   rx->rx_msgaddr));
1168                 KIBLND_UNMAP_ADDR_SET(rx, rx_msgunmap, rx->rx_msgaddr);
1169
1170                 CDEBUG(D_NET, "rx %d: %p %#llx(%#llx)\n",
1171                        i, rx->rx_msg, rx->rx_msgaddr,
1172                        (__u64)(page_to_phys(pg) + pg_off));
1173
1174                 pg_off += IBLND_MSG_SIZE;
1175                 LASSERT(pg_off <= PAGE_SIZE);
1176
1177                 if (pg_off == PAGE_SIZE) {
1178                         pg_off = 0;
1179                         ipg++;
1180                         LASSERT(ipg <= IBLND_RX_MSG_PAGES(conn));
1181                 }
1182         }
1183 }
1184
1185 static void kiblnd_unmap_tx_pool(struct kib_tx_pool *tpo)
1186 {
1187         struct kib_hca_dev *hdev = tpo->tpo_hdev;
1188         struct kib_tx *tx;
1189         int i;
1190
1191         LASSERT(!tpo->tpo_pool.po_allocated);
1192
1193         if (!hdev)
1194                 return;
1195
1196         for (i = 0; i < tpo->tpo_pool.po_size; i++) {
1197                 tx = &tpo->tpo_tx_descs[i];
1198                 kiblnd_dma_unmap_single(hdev->ibh_ibdev,
1199                                         KIBLND_UNMAP_ADDR(tx, tx_msgunmap,
1200                                                           tx->tx_msgaddr),
1201                                         IBLND_MSG_SIZE, DMA_TO_DEVICE);
1202         }
1203
1204         kiblnd_hdev_decref(hdev);
1205         tpo->tpo_hdev = NULL;
1206 }
1207
1208 static struct kib_hca_dev *kiblnd_current_hdev(struct kib_dev *dev)
1209 {
1210         struct kib_hca_dev *hdev;
1211         unsigned long flags;
1212         int i = 0;
1213
1214         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1215         while (dev->ibd_failover) {
1216                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1217                 if (!(i++ % 50))
1218                         CDEBUG(D_NET, "%s: Wait for failover\n",
1219                                dev->ibd_ifname);
1220                 set_current_state(TASK_INTERRUPTIBLE);
1221                 schedule_timeout(cfs_time_seconds(1) / 100);
1222
1223                 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1224         }
1225
1226         kiblnd_hdev_addref_locked(dev->ibd_hdev);
1227         hdev = dev->ibd_hdev;
1228
1229         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1230
1231         return hdev;
1232 }
1233
1234 static void kiblnd_map_tx_pool(struct kib_tx_pool *tpo)
1235 {
1236         struct kib_pages *txpgs = tpo->tpo_tx_pages;
1237         struct kib_pool *pool = &tpo->tpo_pool;
1238         struct kib_net *net = pool->po_owner->ps_net;
1239         struct kib_dev *dev;
1240         struct page *page;
1241         struct kib_tx *tx;
1242         int page_offset;
1243         int ipage;
1244         int i;
1245
1246         LASSERT(net);
1247
1248         dev = net->ibn_dev;
1249
1250         /* pre-mapped messages are not bigger than 1 page */
1251         BUILD_BUG_ON(IBLND_MSG_SIZE > PAGE_SIZE);
1252
1253         /* No fancy arithmetic when we do the buffer calculations */
1254         BUILD_BUG_ON(PAGE_SIZE % IBLND_MSG_SIZE);
1255
1256         tpo->tpo_hdev = kiblnd_current_hdev(dev);
1257
1258         for (ipage = page_offset = i = 0; i < pool->po_size; i++) {
1259                 page = txpgs->ibp_pages[ipage];
1260                 tx = &tpo->tpo_tx_descs[i];
1261
1262                 tx->tx_msg = (struct kib_msg *)(((char *)page_address(page)) +
1263                                            page_offset);
1264
1265                 tx->tx_msgaddr = kiblnd_dma_map_single(
1266                         tpo->tpo_hdev->ibh_ibdev, tx->tx_msg,
1267                         IBLND_MSG_SIZE, DMA_TO_DEVICE);
1268                 LASSERT(!kiblnd_dma_mapping_error(tpo->tpo_hdev->ibh_ibdev,
1269                                                   tx->tx_msgaddr));
1270                 KIBLND_UNMAP_ADDR_SET(tx, tx_msgunmap, tx->tx_msgaddr);
1271
1272                 list_add(&tx->tx_list, &pool->po_free_list);
1273
1274                 page_offset += IBLND_MSG_SIZE;
1275                 LASSERT(page_offset <= PAGE_SIZE);
1276
1277                 if (page_offset == PAGE_SIZE) {
1278                         page_offset = 0;
1279                         ipage++;
1280                         LASSERT(ipage <= txpgs->ibp_npages);
1281                 }
1282         }
1283 }
1284
1285 static void kiblnd_destroy_fmr_pool(struct kib_fmr_pool *fpo)
1286 {
1287         LASSERT(!fpo->fpo_map_count);
1288
1289         if (fpo->fpo_is_fmr) {
1290                 if (fpo->fmr.fpo_fmr_pool)
1291                         ib_destroy_fmr_pool(fpo->fmr.fpo_fmr_pool);
1292         } else {
1293                 struct kib_fast_reg_descriptor *frd, *tmp;
1294                 int i = 0;
1295
1296                 list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1297                                          frd_list) {
1298                         list_del(&frd->frd_list);
1299                         ib_dereg_mr(frd->frd_mr);
1300                         LIBCFS_FREE(frd, sizeof(*frd));
1301                         i++;
1302                 }
1303                 if (i < fpo->fast_reg.fpo_pool_size)
1304                         CERROR("FastReg pool still has %d regions registered\n",
1305                                fpo->fast_reg.fpo_pool_size - i);
1306         }
1307
1308         if (fpo->fpo_hdev)
1309                 kiblnd_hdev_decref(fpo->fpo_hdev);
1310
1311         LIBCFS_FREE(fpo, sizeof(*fpo));
1312 }
1313
1314 static void kiblnd_destroy_fmr_pool_list(struct list_head *head)
1315 {
1316         struct kib_fmr_pool *fpo, *tmp;
1317
1318         list_for_each_entry_safe(fpo, tmp, head, fpo_list) {
1319                 list_del(&fpo->fpo_list);
1320                 kiblnd_destroy_fmr_pool(fpo);
1321         }
1322 }
1323
1324 static int
1325 kiblnd_fmr_pool_size(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1326                      int ncpts)
1327 {
1328         int size = tunables->lnd_fmr_pool_size / ncpts;
1329
1330         return max(IBLND_FMR_POOL, size);
1331 }
1332
1333 static int
1334 kiblnd_fmr_flush_trigger(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1335                          int ncpts)
1336 {
1337         int size = tunables->lnd_fmr_flush_trigger / ncpts;
1338
1339         return max(IBLND_FMR_POOL_FLUSH, size);
1340 }
1341
1342 static int kiblnd_alloc_fmr_pool(struct kib_fmr_poolset *fps, struct kib_fmr_pool *fpo)
1343 {
1344         struct ib_fmr_pool_param param = {
1345                 .max_pages_per_fmr = LNET_MAX_PAYLOAD / PAGE_SIZE,
1346                 .page_shift        = PAGE_SHIFT,
1347                 .access            = (IB_ACCESS_LOCAL_WRITE |
1348                                       IB_ACCESS_REMOTE_WRITE),
1349                 .pool_size         = fps->fps_pool_size,
1350                 .dirty_watermark   = fps->fps_flush_trigger,
1351                 .flush_function    = NULL,
1352                 .flush_arg         = NULL,
1353                 .cache             = !!fps->fps_cache };
1354         int rc = 0;
1355
1356         fpo->fmr.fpo_fmr_pool = ib_create_fmr_pool(fpo->fpo_hdev->ibh_pd,
1357                                                    &param);
1358         if (IS_ERR(fpo->fmr.fpo_fmr_pool)) {
1359                 rc = PTR_ERR(fpo->fmr.fpo_fmr_pool);
1360                 if (rc != -ENOSYS)
1361                         CERROR("Failed to create FMR pool: %d\n", rc);
1362                 else
1363                         CERROR("FMRs are not supported\n");
1364         }
1365
1366         return rc;
1367 }
1368
1369 static int kiblnd_alloc_freg_pool(struct kib_fmr_poolset *fps, struct kib_fmr_pool *fpo)
1370 {
1371         struct kib_fast_reg_descriptor *frd, *tmp;
1372         int i, rc;
1373
1374         INIT_LIST_HEAD(&fpo->fast_reg.fpo_pool_list);
1375         fpo->fast_reg.fpo_pool_size = 0;
1376         for (i = 0; i < fps->fps_pool_size; i++) {
1377                 LIBCFS_CPT_ALLOC(frd, lnet_cpt_table(), fps->fps_cpt,
1378                                  sizeof(*frd));
1379                 if (!frd) {
1380                         CERROR("Failed to allocate a new fast_reg descriptor\n");
1381                         rc = -ENOMEM;
1382                         goto out;
1383                 }
1384
1385                 frd->frd_mr = ib_alloc_mr(fpo->fpo_hdev->ibh_pd,
1386                                           IB_MR_TYPE_MEM_REG,
1387                                           LNET_MAX_PAYLOAD / PAGE_SIZE);
1388                 if (IS_ERR(frd->frd_mr)) {
1389                         rc = PTR_ERR(frd->frd_mr);
1390                         CERROR("Failed to allocate ib_alloc_mr: %d\n", rc);
1391                         frd->frd_mr = NULL;
1392                         goto out_middle;
1393                 }
1394
1395                 frd->frd_valid = true;
1396
1397                 list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1398                 fpo->fast_reg.fpo_pool_size++;
1399         }
1400
1401         return 0;
1402
1403 out_middle:
1404         if (frd->frd_mr)
1405                 ib_dereg_mr(frd->frd_mr);
1406         LIBCFS_FREE(frd, sizeof(*frd));
1407
1408 out:
1409         list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1410                                  frd_list) {
1411                 list_del(&frd->frd_list);
1412                 ib_dereg_mr(frd->frd_mr);
1413                 LIBCFS_FREE(frd, sizeof(*frd));
1414         }
1415
1416         return rc;
1417 }
1418
1419 static int kiblnd_create_fmr_pool(struct kib_fmr_poolset *fps,
1420                                   struct kib_fmr_pool **pp_fpo)
1421 {
1422         struct kib_dev *dev = fps->fps_net->ibn_dev;
1423         struct ib_device_attr *dev_attr;
1424         struct kib_fmr_pool *fpo;
1425         int rc;
1426
1427         LIBCFS_CPT_ALLOC(fpo, lnet_cpt_table(), fps->fps_cpt, sizeof(*fpo));
1428         if (!fpo)
1429                 return -ENOMEM;
1430
1431         fpo->fpo_hdev = kiblnd_current_hdev(dev);
1432         dev_attr = &fpo->fpo_hdev->ibh_ibdev->attrs;
1433
1434         /* Check for FMR or FastReg support */
1435         fpo->fpo_is_fmr = 0;
1436         if (fpo->fpo_hdev->ibh_ibdev->alloc_fmr &&
1437             fpo->fpo_hdev->ibh_ibdev->dealloc_fmr &&
1438             fpo->fpo_hdev->ibh_ibdev->map_phys_fmr &&
1439             fpo->fpo_hdev->ibh_ibdev->unmap_fmr) {
1440                 LCONSOLE_INFO("Using FMR for registration\n");
1441                 fpo->fpo_is_fmr = 1;
1442         } else if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
1443                 LCONSOLE_INFO("Using FastReg for registration\n");
1444         } else {
1445                 rc = -ENOSYS;
1446                 LCONSOLE_ERROR_MSG(rc, "IB device does not support FMRs nor FastRegs, can't register memory\n");
1447                 goto out_fpo;
1448         }
1449
1450         if (fpo->fpo_is_fmr)
1451                 rc = kiblnd_alloc_fmr_pool(fps, fpo);
1452         else
1453                 rc = kiblnd_alloc_freg_pool(fps, fpo);
1454         if (rc)
1455                 goto out_fpo;
1456
1457         fpo->fpo_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1458         fpo->fpo_owner = fps;
1459         *pp_fpo = fpo;
1460
1461         return 0;
1462
1463 out_fpo:
1464         kiblnd_hdev_decref(fpo->fpo_hdev);
1465         LIBCFS_FREE(fpo, sizeof(*fpo));
1466         return rc;
1467 }
1468
1469 static void kiblnd_fail_fmr_poolset(struct kib_fmr_poolset *fps,
1470                                     struct list_head *zombies)
1471 {
1472         if (!fps->fps_net) /* initialized? */
1473                 return;
1474
1475         spin_lock(&fps->fps_lock);
1476
1477         while (!list_empty(&fps->fps_pool_list)) {
1478                 struct kib_fmr_pool *fpo = list_entry(fps->fps_pool_list.next,
1479                                                  struct kib_fmr_pool, fpo_list);
1480                 fpo->fpo_failed = 1;
1481                 list_del(&fpo->fpo_list);
1482                 if (!fpo->fpo_map_count)
1483                         list_add(&fpo->fpo_list, zombies);
1484                 else
1485                         list_add(&fpo->fpo_list, &fps->fps_failed_pool_list);
1486         }
1487
1488         spin_unlock(&fps->fps_lock);
1489 }
1490
1491 static void kiblnd_fini_fmr_poolset(struct kib_fmr_poolset *fps)
1492 {
1493         if (fps->fps_net) { /* initialized? */
1494                 kiblnd_destroy_fmr_pool_list(&fps->fps_failed_pool_list);
1495                 kiblnd_destroy_fmr_pool_list(&fps->fps_pool_list);
1496         }
1497 }
1498
1499 static int
1500 kiblnd_init_fmr_poolset(struct kib_fmr_poolset *fps, int cpt, int ncpts,
1501                         struct kib_net *net,
1502                         struct lnet_ioctl_config_o2iblnd_tunables *tunables)
1503 {
1504         struct kib_fmr_pool *fpo;
1505         int rc;
1506
1507         memset(fps, 0, sizeof(*fps));
1508
1509         fps->fps_net = net;
1510         fps->fps_cpt = cpt;
1511
1512         fps->fps_pool_size = kiblnd_fmr_pool_size(tunables, ncpts);
1513         fps->fps_flush_trigger = kiblnd_fmr_flush_trigger(tunables, ncpts);
1514         fps->fps_cache = tunables->lnd_fmr_cache;
1515
1516         spin_lock_init(&fps->fps_lock);
1517         INIT_LIST_HEAD(&fps->fps_pool_list);
1518         INIT_LIST_HEAD(&fps->fps_failed_pool_list);
1519
1520         rc = kiblnd_create_fmr_pool(fps, &fpo);
1521         if (!rc)
1522                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1523
1524         return rc;
1525 }
1526
1527 static int kiblnd_fmr_pool_is_idle(struct kib_fmr_pool *fpo, unsigned long now)
1528 {
1529         if (fpo->fpo_map_count) /* still in use */
1530                 return 0;
1531         if (fpo->fpo_failed)
1532                 return 1;
1533         return cfs_time_aftereq(now, fpo->fpo_deadline);
1534 }
1535
1536 static int
1537 kiblnd_map_tx_pages(struct kib_tx *tx, struct kib_rdma_desc *rd)
1538 {
1539         __u64 *pages = tx->tx_pages;
1540         struct kib_hca_dev *hdev;
1541         int npages;
1542         int size;
1543         int i;
1544
1545         hdev = tx->tx_pool->tpo_hdev;
1546
1547         for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
1548                 for (size = 0; size <  rd->rd_frags[i].rf_nob;
1549                      size += hdev->ibh_page_size) {
1550                         pages[npages++] = (rd->rd_frags[i].rf_addr &
1551                                            hdev->ibh_page_mask) + size;
1552                 }
1553         }
1554
1555         return npages;
1556 }
1557
1558 void kiblnd_fmr_pool_unmap(struct kib_fmr *fmr, int status)
1559 {
1560         LIST_HEAD(zombies);
1561         struct kib_fmr_pool *fpo = fmr->fmr_pool;
1562         struct kib_fmr_poolset *fps;
1563         unsigned long now = cfs_time_current();
1564         struct kib_fmr_pool *tmp;
1565         int rc;
1566
1567         if (!fpo)
1568                 return;
1569
1570         fps = fpo->fpo_owner;
1571         if (fpo->fpo_is_fmr) {
1572                 if (fmr->fmr_pfmr) {
1573                         rc = ib_fmr_pool_unmap(fmr->fmr_pfmr);
1574                         LASSERT(!rc);
1575                         fmr->fmr_pfmr = NULL;
1576                 }
1577
1578                 if (status) {
1579                         rc = ib_flush_fmr_pool(fpo->fmr.fpo_fmr_pool);
1580                         LASSERT(!rc);
1581                 }
1582         } else {
1583                 struct kib_fast_reg_descriptor *frd = fmr->fmr_frd;
1584
1585                 if (frd) {
1586                         frd->frd_valid = false;
1587                         spin_lock(&fps->fps_lock);
1588                         list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1589                         spin_unlock(&fps->fps_lock);
1590                         fmr->fmr_frd = NULL;
1591                 }
1592         }
1593         fmr->fmr_pool = NULL;
1594
1595         spin_lock(&fps->fps_lock);
1596         fpo->fpo_map_count--;  /* decref the pool */
1597
1598         list_for_each_entry_safe(fpo, tmp, &fps->fps_pool_list, fpo_list) {
1599                 /* the first pool is persistent */
1600                 if (fps->fps_pool_list.next == &fpo->fpo_list)
1601                         continue;
1602
1603                 if (kiblnd_fmr_pool_is_idle(fpo, now)) {
1604                         list_move(&fpo->fpo_list, &zombies);
1605                         fps->fps_version++;
1606                 }
1607         }
1608         spin_unlock(&fps->fps_lock);
1609
1610         if (!list_empty(&zombies))
1611                 kiblnd_destroy_fmr_pool_list(&zombies);
1612 }
1613
1614 int kiblnd_fmr_pool_map(struct kib_fmr_poolset *fps, struct kib_tx *tx,
1615                         struct kib_rdma_desc *rd, __u32 nob, __u64 iov,
1616                         struct kib_fmr *fmr)
1617 {
1618         __u64 *pages = tx->tx_pages;
1619         bool is_rx = (rd != tx->tx_rd);
1620         bool tx_pages_mapped = false;
1621         struct kib_fmr_pool *fpo;
1622         int npages = 0;
1623         __u64 version;
1624         int rc;
1625
1626  again:
1627         spin_lock(&fps->fps_lock);
1628         version = fps->fps_version;
1629         list_for_each_entry(fpo, &fps->fps_pool_list, fpo_list) {
1630                 fpo->fpo_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1631                 fpo->fpo_map_count++;
1632
1633                 if (fpo->fpo_is_fmr) {
1634                         struct ib_pool_fmr *pfmr;
1635
1636                         spin_unlock(&fps->fps_lock);
1637
1638                         if (!tx_pages_mapped) {
1639                                 npages = kiblnd_map_tx_pages(tx, rd);
1640                                 tx_pages_mapped = 1;
1641                         }
1642
1643                         pfmr = ib_fmr_pool_map_phys(fpo->fmr.fpo_fmr_pool,
1644                                                     pages, npages, iov);
1645                         if (likely(!IS_ERR(pfmr))) {
1646                                 fmr->fmr_key = is_rx ? pfmr->fmr->rkey :
1647                                                        pfmr->fmr->lkey;
1648                                 fmr->fmr_frd = NULL;
1649                                 fmr->fmr_pfmr = pfmr;
1650                                 fmr->fmr_pool = fpo;
1651                                 return 0;
1652                         }
1653                         rc = PTR_ERR(pfmr);
1654                 } else {
1655                         if (!list_empty(&fpo->fast_reg.fpo_pool_list)) {
1656                                 struct kib_fast_reg_descriptor *frd;
1657                                 struct ib_reg_wr *wr;
1658                                 struct ib_mr *mr;
1659                                 int n;
1660
1661                                 frd = list_first_entry(&fpo->fast_reg.fpo_pool_list,
1662                                                        struct kib_fast_reg_descriptor,
1663                                                        frd_list);
1664                                 list_del(&frd->frd_list);
1665                                 spin_unlock(&fps->fps_lock);
1666
1667                                 mr = frd->frd_mr;
1668
1669                                 if (!frd->frd_valid) {
1670                                         __u32 key = is_rx ? mr->rkey : mr->lkey;
1671                                         struct ib_send_wr *inv_wr;
1672
1673                                         inv_wr = &frd->frd_inv_wr;
1674                                         memset(inv_wr, 0, sizeof(*inv_wr));
1675                                         inv_wr->opcode = IB_WR_LOCAL_INV;
1676                                         inv_wr->wr_id = IBLND_WID_MR;
1677                                         inv_wr->ex.invalidate_rkey = key;
1678
1679                                         /* Bump the key */
1680                                         key = ib_inc_rkey(key);
1681                                         ib_update_fast_reg_key(mr, key);
1682                                 }
1683
1684                                 n = ib_map_mr_sg(mr, tx->tx_frags,
1685                                                  tx->tx_nfrags, NULL, PAGE_SIZE);
1686                                 if (unlikely(n != tx->tx_nfrags)) {
1687                                         CERROR("Failed to map mr %d/%d elements\n",
1688                                                n, tx->tx_nfrags);
1689                                         return n < 0 ? n : -EINVAL;
1690                                 }
1691
1692                                 mr->iova = iov;
1693
1694                                 /* Prepare FastReg WR */
1695                                 wr = &frd->frd_fastreg_wr;
1696                                 memset(wr, 0, sizeof(*wr));
1697                                 wr->wr.opcode = IB_WR_REG_MR;
1698                                 wr->wr.wr_id = IBLND_WID_MR;
1699                                 wr->wr.num_sge = 0;
1700                                 wr->wr.send_flags = 0;
1701                                 wr->mr = mr;
1702                                 wr->key = is_rx ? mr->rkey : mr->lkey;
1703                                 wr->access = (IB_ACCESS_LOCAL_WRITE |
1704                                               IB_ACCESS_REMOTE_WRITE);
1705
1706                                 fmr->fmr_key = is_rx ? mr->rkey : mr->lkey;
1707                                 fmr->fmr_frd = frd;
1708                                 fmr->fmr_pfmr = NULL;
1709                                 fmr->fmr_pool = fpo;
1710                                 return 0;
1711                         }
1712                         spin_unlock(&fps->fps_lock);
1713                         rc = -EAGAIN;
1714                 }
1715
1716                 spin_lock(&fps->fps_lock);
1717                 fpo->fpo_map_count--;
1718                 if (rc != -EAGAIN) {
1719                         spin_unlock(&fps->fps_lock);
1720                         return rc;
1721                 }
1722
1723                 /* EAGAIN and ... */
1724                 if (version != fps->fps_version) {
1725                         spin_unlock(&fps->fps_lock);
1726                         goto again;
1727                 }
1728         }
1729
1730         if (fps->fps_increasing) {
1731                 spin_unlock(&fps->fps_lock);
1732                 CDEBUG(D_NET, "Another thread is allocating new FMR pool, waiting for her to complete\n");
1733                 schedule();
1734                 goto again;
1735         }
1736
1737         if (time_before(cfs_time_current(), fps->fps_next_retry)) {
1738                 /* someone failed recently */
1739                 spin_unlock(&fps->fps_lock);
1740                 return -EAGAIN;
1741         }
1742
1743         fps->fps_increasing = 1;
1744         spin_unlock(&fps->fps_lock);
1745
1746         CDEBUG(D_NET, "Allocate new FMR pool\n");
1747         rc = kiblnd_create_fmr_pool(fps, &fpo);
1748         spin_lock(&fps->fps_lock);
1749         fps->fps_increasing = 0;
1750         if (!rc) {
1751                 fps->fps_version++;
1752                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1753         } else {
1754                 fps->fps_next_retry = cfs_time_shift(IBLND_POOL_RETRY);
1755         }
1756         spin_unlock(&fps->fps_lock);
1757
1758         goto again;
1759 }
1760
1761 static void kiblnd_fini_pool(struct kib_pool *pool)
1762 {
1763         LASSERT(list_empty(&pool->po_free_list));
1764         LASSERT(!pool->po_allocated);
1765
1766         CDEBUG(D_NET, "Finalize %s pool\n", pool->po_owner->ps_name);
1767 }
1768
1769 static void kiblnd_init_pool(struct kib_poolset *ps, struct kib_pool *pool, int size)
1770 {
1771         CDEBUG(D_NET, "Initialize %s pool\n", ps->ps_name);
1772
1773         memset(pool, 0, sizeof(*pool));
1774         INIT_LIST_HEAD(&pool->po_free_list);
1775         pool->po_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1776         pool->po_owner    = ps;
1777         pool->po_size     = size;
1778 }
1779
1780 static void kiblnd_destroy_pool_list(struct list_head *head)
1781 {
1782         struct kib_pool *pool;
1783
1784         while (!list_empty(head)) {
1785                 pool = list_entry(head->next, struct kib_pool, po_list);
1786                 list_del(&pool->po_list);
1787
1788                 LASSERT(pool->po_owner);
1789                 pool->po_owner->ps_pool_destroy(pool);
1790         }
1791 }
1792
1793 static void kiblnd_fail_poolset(struct kib_poolset *ps, struct list_head *zombies)
1794 {
1795         if (!ps->ps_net) /* initialized? */
1796                 return;
1797
1798         spin_lock(&ps->ps_lock);
1799         while (!list_empty(&ps->ps_pool_list)) {
1800                 struct kib_pool *po = list_entry(ps->ps_pool_list.next,
1801                                             struct kib_pool, po_list);
1802                 po->po_failed = 1;
1803                 list_del(&po->po_list);
1804                 if (!po->po_allocated)
1805                         list_add(&po->po_list, zombies);
1806                 else
1807                         list_add(&po->po_list, &ps->ps_failed_pool_list);
1808         }
1809         spin_unlock(&ps->ps_lock);
1810 }
1811
1812 static void kiblnd_fini_poolset(struct kib_poolset *ps)
1813 {
1814         if (ps->ps_net) { /* initialized? */
1815                 kiblnd_destroy_pool_list(&ps->ps_failed_pool_list);
1816                 kiblnd_destroy_pool_list(&ps->ps_pool_list);
1817         }
1818 }
1819
1820 static int kiblnd_init_poolset(struct kib_poolset *ps, int cpt,
1821                                struct kib_net *net, char *name, int size,
1822                                kib_ps_pool_create_t po_create,
1823                                kib_ps_pool_destroy_t po_destroy,
1824                                kib_ps_node_init_t nd_init,
1825                                kib_ps_node_fini_t nd_fini)
1826 {
1827         struct kib_pool *pool;
1828         int rc;
1829
1830         memset(ps, 0, sizeof(*ps));
1831
1832         ps->ps_cpt          = cpt;
1833         ps->ps_net          = net;
1834         ps->ps_pool_create  = po_create;
1835         ps->ps_pool_destroy = po_destroy;
1836         ps->ps_node_init    = nd_init;
1837         ps->ps_node_fini    = nd_fini;
1838         ps->ps_pool_size    = size;
1839         if (strlcpy(ps->ps_name, name, sizeof(ps->ps_name))
1840             >= sizeof(ps->ps_name))
1841                 return -E2BIG;
1842         spin_lock_init(&ps->ps_lock);
1843         INIT_LIST_HEAD(&ps->ps_pool_list);
1844         INIT_LIST_HEAD(&ps->ps_failed_pool_list);
1845
1846         rc = ps->ps_pool_create(ps, size, &pool);
1847         if (!rc)
1848                 list_add(&pool->po_list, &ps->ps_pool_list);
1849         else
1850                 CERROR("Failed to create the first pool for %s\n", ps->ps_name);
1851
1852         return rc;
1853 }
1854
1855 static int kiblnd_pool_is_idle(struct kib_pool *pool, unsigned long now)
1856 {
1857         if (pool->po_allocated) /* still in use */
1858                 return 0;
1859         if (pool->po_failed)
1860                 return 1;
1861         return cfs_time_aftereq(now, pool->po_deadline);
1862 }
1863
1864 void kiblnd_pool_free_node(struct kib_pool *pool, struct list_head *node)
1865 {
1866         LIST_HEAD(zombies);
1867         struct kib_poolset *ps = pool->po_owner;
1868         struct kib_pool *tmp;
1869         unsigned long now = cfs_time_current();
1870
1871         spin_lock(&ps->ps_lock);
1872
1873         if (ps->ps_node_fini)
1874                 ps->ps_node_fini(pool, node);
1875
1876         LASSERT(pool->po_allocated > 0);
1877         list_add(node, &pool->po_free_list);
1878         pool->po_allocated--;
1879
1880         list_for_each_entry_safe(pool, tmp, &ps->ps_pool_list, po_list) {
1881                 /* the first pool is persistent */
1882                 if (ps->ps_pool_list.next == &pool->po_list)
1883                         continue;
1884
1885                 if (kiblnd_pool_is_idle(pool, now))
1886                         list_move(&pool->po_list, &zombies);
1887         }
1888         spin_unlock(&ps->ps_lock);
1889
1890         if (!list_empty(&zombies))
1891                 kiblnd_destroy_pool_list(&zombies);
1892 }
1893
1894 struct list_head *kiblnd_pool_alloc_node(struct kib_poolset *ps)
1895 {
1896         struct list_head *node;
1897         struct kib_pool *pool;
1898         unsigned int interval = 1;
1899         unsigned long time_before;
1900         unsigned int trips = 0;
1901         int rc;
1902
1903  again:
1904         spin_lock(&ps->ps_lock);
1905         list_for_each_entry(pool, &ps->ps_pool_list, po_list) {
1906                 if (list_empty(&pool->po_free_list))
1907                         continue;
1908
1909                 pool->po_allocated++;
1910                 pool->po_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1911                 node = pool->po_free_list.next;
1912                 list_del(node);
1913
1914                 if (ps->ps_node_init) {
1915                         /* still hold the lock */
1916                         ps->ps_node_init(pool, node);
1917                 }
1918                 spin_unlock(&ps->ps_lock);
1919                 return node;
1920         }
1921
1922         /* no available tx pool and ... */
1923         if (ps->ps_increasing) {
1924                 /* another thread is allocating a new pool */
1925                 spin_unlock(&ps->ps_lock);
1926                 trips++;
1927                 CDEBUG(D_NET, "Another thread is allocating new %s pool, waiting %d HZs for her to complete. trips = %d\n",
1928                        ps->ps_name, interval, trips);
1929
1930                 set_current_state(TASK_INTERRUPTIBLE);
1931                 schedule_timeout(interval);
1932                 if (interval < cfs_time_seconds(1))
1933                         interval *= 2;
1934
1935                 goto again;
1936         }
1937
1938         if (time_before(cfs_time_current(), ps->ps_next_retry)) {
1939                 /* someone failed recently */
1940                 spin_unlock(&ps->ps_lock);
1941                 return NULL;
1942         }
1943
1944         ps->ps_increasing = 1;
1945         spin_unlock(&ps->ps_lock);
1946
1947         CDEBUG(D_NET, "%s pool exhausted, allocate new pool\n", ps->ps_name);
1948         time_before = cfs_time_current();
1949         rc = ps->ps_pool_create(ps, ps->ps_pool_size, &pool);
1950         CDEBUG(D_NET, "ps_pool_create took %lu HZ to complete",
1951                cfs_time_current() - time_before);
1952
1953         spin_lock(&ps->ps_lock);
1954         ps->ps_increasing = 0;
1955         if (!rc) {
1956                 list_add_tail(&pool->po_list, &ps->ps_pool_list);
1957         } else {
1958                 ps->ps_next_retry = cfs_time_shift(IBLND_POOL_RETRY);
1959                 CERROR("Can't allocate new %s pool because out of memory\n",
1960                        ps->ps_name);
1961         }
1962         spin_unlock(&ps->ps_lock);
1963
1964         goto again;
1965 }
1966
1967 static void kiblnd_destroy_tx_pool(struct kib_pool *pool)
1968 {
1969         struct kib_tx_pool *tpo = container_of(pool, struct kib_tx_pool, tpo_pool);
1970         int i;
1971
1972         LASSERT(!pool->po_allocated);
1973
1974         if (tpo->tpo_tx_pages) {
1975                 kiblnd_unmap_tx_pool(tpo);
1976                 kiblnd_free_pages(tpo->tpo_tx_pages);
1977         }
1978
1979         if (!tpo->tpo_tx_descs)
1980                 goto out;
1981
1982         for (i = 0; i < pool->po_size; i++) {
1983                 struct kib_tx *tx = &tpo->tpo_tx_descs[i];
1984
1985                 list_del(&tx->tx_list);
1986                 if (tx->tx_pages)
1987                         LIBCFS_FREE(tx->tx_pages,
1988                                     LNET_MAX_IOV *
1989                                     sizeof(*tx->tx_pages));
1990                 if (tx->tx_frags)
1991                         LIBCFS_FREE(tx->tx_frags,
1992                                     (1 + IBLND_MAX_RDMA_FRAGS) *
1993                                      sizeof(*tx->tx_frags));
1994                 if (tx->tx_wrq)
1995                         LIBCFS_FREE(tx->tx_wrq,
1996                                     (1 + IBLND_MAX_RDMA_FRAGS) *
1997                                     sizeof(*tx->tx_wrq));
1998                 if (tx->tx_sge)
1999                         LIBCFS_FREE(tx->tx_sge,
2000                                     (1 + IBLND_MAX_RDMA_FRAGS) *
2001                                     sizeof(*tx->tx_sge));
2002                 if (tx->tx_rd)
2003                         LIBCFS_FREE(tx->tx_rd,
2004                                     offsetof(struct kib_rdma_desc,
2005                                              rd_frags[IBLND_MAX_RDMA_FRAGS]));
2006         }
2007
2008         LIBCFS_FREE(tpo->tpo_tx_descs,
2009                     pool->po_size * sizeof(struct kib_tx));
2010 out:
2011         kiblnd_fini_pool(pool);
2012         LIBCFS_FREE(tpo, sizeof(*tpo));
2013 }
2014
2015 static int kiblnd_tx_pool_size(int ncpts)
2016 {
2017         int ntx = *kiblnd_tunables.kib_ntx / ncpts;
2018
2019         return max(IBLND_TX_POOL, ntx);
2020 }
2021
2022 static int kiblnd_create_tx_pool(struct kib_poolset *ps, int size,
2023                                  struct kib_pool **pp_po)
2024 {
2025         int i;
2026         int npg;
2027         struct kib_pool *pool;
2028         struct kib_tx_pool *tpo;
2029
2030         LIBCFS_CPT_ALLOC(tpo, lnet_cpt_table(), ps->ps_cpt, sizeof(*tpo));
2031         if (!tpo) {
2032                 CERROR("Failed to allocate TX pool\n");
2033                 return -ENOMEM;
2034         }
2035
2036         pool = &tpo->tpo_pool;
2037         kiblnd_init_pool(ps, pool, size);
2038         tpo->tpo_tx_descs = NULL;
2039         tpo->tpo_tx_pages = NULL;
2040
2041         npg = DIV_ROUND_UP(size * IBLND_MSG_SIZE, PAGE_SIZE);
2042         if (kiblnd_alloc_pages(&tpo->tpo_tx_pages, ps->ps_cpt, npg)) {
2043                 CERROR("Can't allocate tx pages: %d\n", npg);
2044                 LIBCFS_FREE(tpo, sizeof(*tpo));
2045                 return -ENOMEM;
2046         }
2047
2048         LIBCFS_CPT_ALLOC(tpo->tpo_tx_descs, lnet_cpt_table(), ps->ps_cpt,
2049                          size * sizeof(struct kib_tx));
2050         if (!tpo->tpo_tx_descs) {
2051                 CERROR("Can't allocate %d tx descriptors\n", size);
2052                 ps->ps_pool_destroy(pool);
2053                 return -ENOMEM;
2054         }
2055
2056         memset(tpo->tpo_tx_descs, 0, size * sizeof(struct kib_tx));
2057
2058         for (i = 0; i < size; i++) {
2059                 struct kib_tx *tx = &tpo->tpo_tx_descs[i];
2060
2061                 tx->tx_pool = tpo;
2062                 if (ps->ps_net->ibn_fmr_ps) {
2063                         LIBCFS_CPT_ALLOC(tx->tx_pages,
2064                                          lnet_cpt_table(), ps->ps_cpt,
2065                                          LNET_MAX_IOV * sizeof(*tx->tx_pages));
2066                         if (!tx->tx_pages)
2067                                 break;
2068                 }
2069
2070                 LIBCFS_CPT_ALLOC(tx->tx_frags, lnet_cpt_table(), ps->ps_cpt,
2071                                  (1 + IBLND_MAX_RDMA_FRAGS) *
2072                                  sizeof(*tx->tx_frags));
2073                 if (!tx->tx_frags)
2074                         break;
2075
2076                 sg_init_table(tx->tx_frags, IBLND_MAX_RDMA_FRAGS + 1);
2077
2078                 LIBCFS_CPT_ALLOC(tx->tx_wrq, lnet_cpt_table(), ps->ps_cpt,
2079                                  (1 + IBLND_MAX_RDMA_FRAGS) *
2080                                  sizeof(*tx->tx_wrq));
2081                 if (!tx->tx_wrq)
2082                         break;
2083
2084                 LIBCFS_CPT_ALLOC(tx->tx_sge, lnet_cpt_table(), ps->ps_cpt,
2085                                  (1 + IBLND_MAX_RDMA_FRAGS) *
2086                                  sizeof(*tx->tx_sge));
2087                 if (!tx->tx_sge)
2088                         break;
2089
2090                 LIBCFS_CPT_ALLOC(tx->tx_rd, lnet_cpt_table(), ps->ps_cpt,
2091                                  offsetof(struct kib_rdma_desc,
2092                                           rd_frags[IBLND_MAX_RDMA_FRAGS]));
2093                 if (!tx->tx_rd)
2094                         break;
2095         }
2096
2097         if (i == size) {
2098                 kiblnd_map_tx_pool(tpo);
2099                 *pp_po = pool;
2100                 return 0;
2101         }
2102
2103         ps->ps_pool_destroy(pool);
2104         return -ENOMEM;
2105 }
2106
2107 static void kiblnd_tx_init(struct kib_pool *pool, struct list_head *node)
2108 {
2109         struct kib_tx_poolset *tps = container_of(pool->po_owner,
2110                                                   struct kib_tx_poolset,
2111                                                   tps_poolset);
2112         struct kib_tx *tx = list_entry(node, struct kib_tx, tx_list);
2113
2114         tx->tx_cookie = tps->tps_next_tx_cookie++;
2115 }
2116
2117 static void kiblnd_net_fini_pools(struct kib_net *net)
2118 {
2119         int i;
2120
2121         cfs_cpt_for_each(i, lnet_cpt_table()) {
2122                 struct kib_tx_poolset *tps;
2123                 struct kib_fmr_poolset *fps;
2124
2125                 if (net->ibn_tx_ps) {
2126                         tps = net->ibn_tx_ps[i];
2127                         kiblnd_fini_poolset(&tps->tps_poolset);
2128                 }
2129
2130                 if (net->ibn_fmr_ps) {
2131                         fps = net->ibn_fmr_ps[i];
2132                         kiblnd_fini_fmr_poolset(fps);
2133                 }
2134         }
2135
2136         if (net->ibn_tx_ps) {
2137                 cfs_percpt_free(net->ibn_tx_ps);
2138                 net->ibn_tx_ps = NULL;
2139         }
2140
2141         if (net->ibn_fmr_ps) {
2142                 cfs_percpt_free(net->ibn_fmr_ps);
2143                 net->ibn_fmr_ps = NULL;
2144         }
2145 }
2146
2147 static int kiblnd_net_init_pools(struct kib_net *net, struct lnet_ni *ni,
2148                                  __u32 *cpts, int ncpts)
2149 {
2150         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2151         int cpt;
2152         int rc;
2153         int i;
2154
2155         tunables = &ni->ni_lnd_tunables->lt_tun_u.lt_o2ib;
2156
2157         if (tunables->lnd_fmr_pool_size < *kiblnd_tunables.kib_ntx / 4) {
2158                 CERROR("Can't set fmr pool size (%d) < ntx / 4(%d)\n",
2159                        tunables->lnd_fmr_pool_size,
2160                        *kiblnd_tunables.kib_ntx / 4);
2161                 rc = -EINVAL;
2162                 goto failed;
2163         }
2164
2165         /*
2166          * TX pool must be created later than FMR, see LU-2268
2167          * for details
2168          */
2169         LASSERT(!net->ibn_tx_ps);
2170
2171         /*
2172          * premapping can fail if ibd_nmr > 1, so we always create
2173          * FMR pool and map-on-demand if premapping failed
2174          *
2175          * cfs_precpt_alloc is creating an array of struct kib_fmr_poolset
2176          * The number of struct kib_fmr_poolsets create is equal to the
2177          * number of CPTs that exist, i.e net->ibn_fmr_ps[cpt].
2178          */
2179         net->ibn_fmr_ps = cfs_percpt_alloc(lnet_cpt_table(),
2180                                            sizeof(struct kib_fmr_poolset));
2181         if (!net->ibn_fmr_ps) {
2182                 CERROR("Failed to allocate FMR pool array\n");
2183                 rc = -ENOMEM;
2184                 goto failed;
2185         }
2186
2187         for (i = 0; i < ncpts; i++) {
2188                 cpt = !cpts ? i : cpts[i];
2189                 rc = kiblnd_init_fmr_poolset(net->ibn_fmr_ps[cpt], cpt, ncpts,
2190                                              net, tunables);
2191                 if (rc) {
2192                         CERROR("Can't initialize FMR pool for CPT %d: %d\n",
2193                                cpt, rc);
2194                         goto failed;
2195                 }
2196         }
2197
2198         if (i > 0)
2199                 LASSERT(i == ncpts);
2200
2201         /*
2202          * cfs_precpt_alloc is creating an array of struct kib_tx_poolset
2203          * The number of struct kib_tx_poolsets create is equal to the
2204          * number of CPTs that exist, i.e net->ibn_tx_ps[cpt].
2205          */
2206         net->ibn_tx_ps = cfs_percpt_alloc(lnet_cpt_table(),
2207                                           sizeof(struct kib_tx_poolset));
2208         if (!net->ibn_tx_ps) {
2209                 CERROR("Failed to allocate tx pool array\n");
2210                 rc = -ENOMEM;
2211                 goto failed;
2212         }
2213
2214         for (i = 0; i < ncpts; i++) {
2215                 cpt = !cpts ? i : cpts[i];
2216                 rc = kiblnd_init_poolset(&net->ibn_tx_ps[cpt]->tps_poolset,
2217                                          cpt, net, "TX",
2218                                          kiblnd_tx_pool_size(ncpts),
2219                                          kiblnd_create_tx_pool,
2220                                          kiblnd_destroy_tx_pool,
2221                                          kiblnd_tx_init, NULL);
2222                 if (rc) {
2223                         CERROR("Can't initialize TX pool for CPT %d: %d\n",
2224                                cpt, rc);
2225                         goto failed;
2226                 }
2227         }
2228
2229         return 0;
2230  failed:
2231         kiblnd_net_fini_pools(net);
2232         LASSERT(rc);
2233         return rc;
2234 }
2235
2236 static int kiblnd_hdev_get_attr(struct kib_hca_dev *hdev)
2237 {
2238         /*
2239          * It's safe to assume a HCA can handle a page size
2240          * matching that of the native system
2241          */
2242         hdev->ibh_page_shift = PAGE_SHIFT;
2243         hdev->ibh_page_size  = 1 << PAGE_SHIFT;
2244         hdev->ibh_page_mask  = ~((__u64)hdev->ibh_page_size - 1);
2245
2246         hdev->ibh_mr_size = hdev->ibh_ibdev->attrs.max_mr_size;
2247         if (hdev->ibh_mr_size == ~0ULL) {
2248                 hdev->ibh_mr_shift = 64;
2249                 return 0;
2250         }
2251
2252         CERROR("Invalid mr size: %#llx\n", hdev->ibh_mr_size);
2253         return -EINVAL;
2254 }
2255
2256 void kiblnd_hdev_destroy(struct kib_hca_dev *hdev)
2257 {
2258         if (hdev->ibh_pd)
2259                 ib_dealloc_pd(hdev->ibh_pd);
2260
2261         if (hdev->ibh_cmid)
2262                 rdma_destroy_id(hdev->ibh_cmid);
2263
2264         LIBCFS_FREE(hdev, sizeof(*hdev));
2265 }
2266
2267 /* DUMMY */
2268 static int kiblnd_dummy_callback(struct rdma_cm_id *cmid,
2269                                  struct rdma_cm_event *event)
2270 {
2271         return 0;
2272 }
2273
2274 static int kiblnd_dev_need_failover(struct kib_dev *dev)
2275 {
2276         struct rdma_cm_id *cmid;
2277         struct sockaddr_in srcaddr;
2278         struct sockaddr_in dstaddr;
2279         int rc;
2280
2281         if (!dev->ibd_hdev || /* initializing */
2282             !dev->ibd_hdev->ibh_cmid || /* listener is dead */
2283             *kiblnd_tunables.kib_dev_failover > 1) /* debugging */
2284                 return 1;
2285
2286         /*
2287          * XXX: it's UGLY, but I don't have better way to find
2288          * ib-bonding HCA failover because:
2289          *
2290          * a. no reliable CM event for HCA failover...
2291          * b. no OFED API to get ib_device for current net_device...
2292          *
2293          * We have only two choices at this point:
2294          *
2295          * a. rdma_bind_addr(), it will conflict with listener cmid
2296          * b. rdma_resolve_addr() to zero addr
2297          */
2298         cmid = kiblnd_rdma_create_id(kiblnd_dummy_callback, dev, RDMA_PS_TCP,
2299                                      IB_QPT_RC);
2300         if (IS_ERR(cmid)) {
2301                 rc = PTR_ERR(cmid);
2302                 CERROR("Failed to create cmid for failover: %d\n", rc);
2303                 return rc;
2304         }
2305
2306         memset(&srcaddr, 0, sizeof(srcaddr));
2307         srcaddr.sin_family = AF_INET;
2308         srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
2309
2310         memset(&dstaddr, 0, sizeof(dstaddr));
2311         dstaddr.sin_family = AF_INET;
2312         rc = rdma_resolve_addr(cmid, (struct sockaddr *)&srcaddr,
2313                                (struct sockaddr *)&dstaddr, 1);
2314         if (rc || !cmid->device) {
2315                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2316                        dev->ibd_ifname, &dev->ibd_ifip,
2317                        cmid->device, rc);
2318                 rdma_destroy_id(cmid);
2319                 return rc;
2320         }
2321
2322         rc = dev->ibd_hdev->ibh_ibdev != cmid->device; /* true for failover */
2323         rdma_destroy_id(cmid);
2324
2325         return rc;
2326 }
2327
2328 int kiblnd_dev_failover(struct kib_dev *dev)
2329 {
2330         LIST_HEAD(zombie_tpo);
2331         LIST_HEAD(zombie_ppo);
2332         LIST_HEAD(zombie_fpo);
2333         struct rdma_cm_id *cmid  = NULL;
2334         struct kib_hca_dev *hdev  = NULL;
2335         struct ib_pd *pd;
2336         struct kib_net *net;
2337         struct sockaddr_in addr;
2338         unsigned long flags;
2339         int rc = 0;
2340         int i;
2341
2342         LASSERT(*kiblnd_tunables.kib_dev_failover > 1 ||
2343                 dev->ibd_can_failover || !dev->ibd_hdev);
2344
2345         rc = kiblnd_dev_need_failover(dev);
2346         if (rc <= 0)
2347                 goto out;
2348
2349         if (dev->ibd_hdev &&
2350             dev->ibd_hdev->ibh_cmid) {
2351                 /*
2352                  * XXX it's not good to close old listener at here,
2353                  * because we can fail to create new listener.
2354                  * But we have to close it now, otherwise rdma_bind_addr
2355                  * will return EADDRINUSE... How crap!
2356                  */
2357                 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2358
2359                 cmid = dev->ibd_hdev->ibh_cmid;
2360                 /*
2361                  * make next schedule of kiblnd_dev_need_failover()
2362                  * return 1 for me
2363                  */
2364                 dev->ibd_hdev->ibh_cmid  = NULL;
2365                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2366
2367                 rdma_destroy_id(cmid);
2368         }
2369
2370         cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, dev, RDMA_PS_TCP,
2371                                      IB_QPT_RC);
2372         if (IS_ERR(cmid)) {
2373                 rc = PTR_ERR(cmid);
2374                 CERROR("Failed to create cmid for failover: %d\n", rc);
2375                 goto out;
2376         }
2377
2378         memset(&addr, 0, sizeof(addr));
2379         addr.sin_family      = AF_INET;
2380         addr.sin_addr.s_addr = htonl(dev->ibd_ifip);
2381         addr.sin_port   = htons(*kiblnd_tunables.kib_service);
2382
2383         /* Bind to failover device or port */
2384         rc = rdma_bind_addr(cmid, (struct sockaddr *)&addr);
2385         if (rc || !cmid->device) {
2386                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2387                        dev->ibd_ifname, &dev->ibd_ifip,
2388                        cmid->device, rc);
2389                 rdma_destroy_id(cmid);
2390                 goto out;
2391         }
2392
2393         LIBCFS_ALLOC(hdev, sizeof(*hdev));
2394         if (!hdev) {
2395                 CERROR("Failed to allocate kib_hca_dev\n");
2396                 rdma_destroy_id(cmid);
2397                 rc = -ENOMEM;
2398                 goto out;
2399         }
2400
2401         atomic_set(&hdev->ibh_ref, 1);
2402         hdev->ibh_dev   = dev;
2403         hdev->ibh_cmid  = cmid;
2404         hdev->ibh_ibdev = cmid->device;
2405
2406         pd = ib_alloc_pd(cmid->device, 0);
2407         if (IS_ERR(pd)) {
2408                 rc = PTR_ERR(pd);
2409                 CERROR("Can't allocate PD: %d\n", rc);
2410                 goto out;
2411         }
2412
2413         hdev->ibh_pd = pd;
2414
2415         rc = rdma_listen(cmid, 0);
2416         if (rc) {
2417                 CERROR("Can't start new listener: %d\n", rc);
2418                 goto out;
2419         }
2420
2421         rc = kiblnd_hdev_get_attr(hdev);
2422         if (rc) {
2423                 CERROR("Can't get device attributes: %d\n", rc);
2424                 goto out;
2425         }
2426
2427         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2428
2429         swap(dev->ibd_hdev, hdev); /* take over the refcount */
2430
2431         list_for_each_entry(net, &dev->ibd_nets, ibn_list) {
2432                 cfs_cpt_for_each(i, lnet_cpt_table()) {
2433                         kiblnd_fail_poolset(&net->ibn_tx_ps[i]->tps_poolset,
2434                                             &zombie_tpo);
2435
2436                         if (net->ibn_fmr_ps)
2437                                 kiblnd_fail_fmr_poolset(net->ibn_fmr_ps[i],
2438                                                         &zombie_fpo);
2439                 }
2440         }
2441
2442         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2443  out:
2444         if (!list_empty(&zombie_tpo))
2445                 kiblnd_destroy_pool_list(&zombie_tpo);
2446         if (!list_empty(&zombie_ppo))
2447                 kiblnd_destroy_pool_list(&zombie_ppo);
2448         if (!list_empty(&zombie_fpo))
2449                 kiblnd_destroy_fmr_pool_list(&zombie_fpo);
2450         if (hdev)
2451                 kiblnd_hdev_decref(hdev);
2452
2453         if (rc)
2454                 dev->ibd_failed_failover++;
2455         else
2456                 dev->ibd_failed_failover = 0;
2457
2458         return rc;
2459 }
2460
2461 void kiblnd_destroy_dev(struct kib_dev *dev)
2462 {
2463         LASSERT(!dev->ibd_nnets);
2464         LASSERT(list_empty(&dev->ibd_nets));
2465
2466         list_del(&dev->ibd_fail_list);
2467         list_del(&dev->ibd_list);
2468
2469         if (dev->ibd_hdev)
2470                 kiblnd_hdev_decref(dev->ibd_hdev);
2471
2472         LIBCFS_FREE(dev, sizeof(*dev));
2473 }
2474
2475 static struct kib_dev *kiblnd_create_dev(char *ifname)
2476 {
2477         struct net_device *netdev;
2478         struct kib_dev *dev;
2479         __u32 netmask;
2480         __u32 ip;
2481         int up;
2482         int rc;
2483
2484         rc = lnet_ipif_query(ifname, &up, &ip, &netmask);
2485         if (rc) {
2486                 CERROR("Can't query IPoIB interface %s: %d\n",
2487                        ifname, rc);
2488                 return NULL;
2489         }
2490
2491         if (!up) {
2492                 CERROR("Can't query IPoIB interface %s: it's down\n", ifname);
2493                 return NULL;
2494         }
2495
2496         LIBCFS_ALLOC(dev, sizeof(*dev));
2497         if (!dev)
2498                 return NULL;
2499
2500         netdev = dev_get_by_name(&init_net, ifname);
2501         if (!netdev) {
2502                 dev->ibd_can_failover = 0;
2503         } else {
2504                 dev->ibd_can_failover = !!(netdev->flags & IFF_MASTER);
2505                 dev_put(netdev);
2506         }
2507
2508         INIT_LIST_HEAD(&dev->ibd_nets);
2509         INIT_LIST_HEAD(&dev->ibd_list); /* not yet in kib_devs */
2510         INIT_LIST_HEAD(&dev->ibd_fail_list);
2511         dev->ibd_ifip = ip;
2512         strcpy(&dev->ibd_ifname[0], ifname);
2513
2514         /* initialize the device */
2515         rc = kiblnd_dev_failover(dev);
2516         if (rc) {
2517                 CERROR("Can't initialize device: %d\n", rc);
2518                 LIBCFS_FREE(dev, sizeof(*dev));
2519                 return NULL;
2520         }
2521
2522         list_add_tail(&dev->ibd_list, &kiblnd_data.kib_devs);
2523         return dev;
2524 }
2525
2526 static void kiblnd_base_shutdown(void)
2527 {
2528         struct kib_sched_info *sched;
2529         int i;
2530
2531         LASSERT(list_empty(&kiblnd_data.kib_devs));
2532
2533         switch (kiblnd_data.kib_init) {
2534         default:
2535                 LBUG();
2536
2537         case IBLND_INIT_ALL:
2538         case IBLND_INIT_DATA:
2539                 LASSERT(kiblnd_data.kib_peers);
2540                 for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++)
2541                         LASSERT(list_empty(&kiblnd_data.kib_peers[i]));
2542                 LASSERT(list_empty(&kiblnd_data.kib_connd_zombies));
2543                 LASSERT(list_empty(&kiblnd_data.kib_connd_conns));
2544                 LASSERT(list_empty(&kiblnd_data.kib_reconn_list));
2545                 LASSERT(list_empty(&kiblnd_data.kib_reconn_wait));
2546
2547                 /* flag threads to terminate; wake and wait for them to die */
2548                 kiblnd_data.kib_shutdown = 1;
2549
2550                 /*
2551                  * NB: we really want to stop scheduler threads net by net
2552                  * instead of the whole module, this should be improved
2553                  * with dynamic configuration LNet
2554                  */
2555                 cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds)
2556                         wake_up_all(&sched->ibs_waitq);
2557
2558                 wake_up_all(&kiblnd_data.kib_connd_waitq);
2559                 wake_up_all(&kiblnd_data.kib_failover_waitq);
2560
2561                 i = 2;
2562                 while (atomic_read(&kiblnd_data.kib_nthreads)) {
2563                         i++;
2564                         /* power of 2 ? */
2565                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2566                                "Waiting for %d threads to terminate\n",
2567                                atomic_read(&kiblnd_data.kib_nthreads));
2568                         set_current_state(TASK_UNINTERRUPTIBLE);
2569                         schedule_timeout(cfs_time_seconds(1));
2570                 }
2571
2572                 /* fall through */
2573
2574         case IBLND_INIT_NOTHING:
2575                 break;
2576         }
2577
2578         if (kiblnd_data.kib_peers) {
2579                 LIBCFS_FREE(kiblnd_data.kib_peers,
2580                             sizeof(struct list_head) *
2581                             kiblnd_data.kib_peer_hash_size);
2582         }
2583
2584         if (kiblnd_data.kib_scheds)
2585                 cfs_percpt_free(kiblnd_data.kib_scheds);
2586
2587         kiblnd_data.kib_init = IBLND_INIT_NOTHING;
2588         module_put(THIS_MODULE);
2589 }
2590
2591 static void kiblnd_shutdown(struct lnet_ni *ni)
2592 {
2593         struct kib_net *net = ni->ni_data;
2594         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2595         int i;
2596         unsigned long flags;
2597
2598         LASSERT(kiblnd_data.kib_init == IBLND_INIT_ALL);
2599
2600         if (!net)
2601                 goto out;
2602
2603         write_lock_irqsave(g_lock, flags);
2604         net->ibn_shutdown = 1;
2605         write_unlock_irqrestore(g_lock, flags);
2606
2607         switch (net->ibn_init) {
2608         default:
2609                 LBUG();
2610
2611         case IBLND_INIT_ALL:
2612                 /* nuke all existing peers within this net */
2613                 kiblnd_del_peer(ni, LNET_NID_ANY);
2614
2615                 /* Wait for all peer state to clean up */
2616                 i = 2;
2617                 while (atomic_read(&net->ibn_npeers)) {
2618                         i++;
2619                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* 2**n? */
2620                                "%s: waiting for %d peers to disconnect\n",
2621                                libcfs_nid2str(ni->ni_nid),
2622                                atomic_read(&net->ibn_npeers));
2623                         set_current_state(TASK_UNINTERRUPTIBLE);
2624                         schedule_timeout(cfs_time_seconds(1));
2625                 }
2626
2627                 kiblnd_net_fini_pools(net);
2628
2629                 write_lock_irqsave(g_lock, flags);
2630                 LASSERT(net->ibn_dev->ibd_nnets > 0);
2631                 net->ibn_dev->ibd_nnets--;
2632                 list_del(&net->ibn_list);
2633                 write_unlock_irqrestore(g_lock, flags);
2634
2635                 /* fall through */
2636
2637         case IBLND_INIT_NOTHING:
2638                 LASSERT(!atomic_read(&net->ibn_nconns));
2639
2640                 if (net->ibn_dev && !net->ibn_dev->ibd_nnets)
2641                         kiblnd_destroy_dev(net->ibn_dev);
2642
2643                 break;
2644         }
2645
2646         net->ibn_init = IBLND_INIT_NOTHING;
2647         ni->ni_data = NULL;
2648
2649         LIBCFS_FREE(net, sizeof(*net));
2650
2651 out:
2652         if (list_empty(&kiblnd_data.kib_devs))
2653                 kiblnd_base_shutdown();
2654 }
2655
2656 static int kiblnd_base_startup(void)
2657 {
2658         struct kib_sched_info *sched;
2659         int rc;
2660         int i;
2661
2662         LASSERT(kiblnd_data.kib_init == IBLND_INIT_NOTHING);
2663
2664         try_module_get(THIS_MODULE);
2665         /* zero pointers, flags etc */
2666         memset(&kiblnd_data, 0, sizeof(kiblnd_data));
2667
2668         rwlock_init(&kiblnd_data.kib_global_lock);
2669
2670         INIT_LIST_HEAD(&kiblnd_data.kib_devs);
2671         INIT_LIST_HEAD(&kiblnd_data.kib_failed_devs);
2672
2673         kiblnd_data.kib_peer_hash_size = IBLND_PEER_HASH_SIZE;
2674         LIBCFS_ALLOC(kiblnd_data.kib_peers,
2675                      sizeof(struct list_head) * kiblnd_data.kib_peer_hash_size);
2676         if (!kiblnd_data.kib_peers)
2677                 goto failed;
2678         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++)
2679                 INIT_LIST_HEAD(&kiblnd_data.kib_peers[i]);
2680
2681         spin_lock_init(&kiblnd_data.kib_connd_lock);
2682         INIT_LIST_HEAD(&kiblnd_data.kib_connd_conns);
2683         INIT_LIST_HEAD(&kiblnd_data.kib_connd_zombies);
2684         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_list);
2685         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_wait);
2686
2687         init_waitqueue_head(&kiblnd_data.kib_connd_waitq);
2688         init_waitqueue_head(&kiblnd_data.kib_failover_waitq);
2689
2690         kiblnd_data.kib_scheds = cfs_percpt_alloc(lnet_cpt_table(),
2691                                                   sizeof(*sched));
2692         if (!kiblnd_data.kib_scheds)
2693                 goto failed;
2694
2695         cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
2696                 int nthrs;
2697
2698                 spin_lock_init(&sched->ibs_lock);
2699                 INIT_LIST_HEAD(&sched->ibs_conns);
2700                 init_waitqueue_head(&sched->ibs_waitq);
2701
2702                 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
2703                 if (*kiblnd_tunables.kib_nscheds > 0) {
2704                         nthrs = min(nthrs, *kiblnd_tunables.kib_nscheds);
2705                 } else {
2706                         /*
2707                          * max to half of CPUs, another half is reserved for
2708                          * upper layer modules
2709                          */
2710                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
2711                 }
2712
2713                 sched->ibs_nthreads_max = nthrs;
2714                 sched->ibs_cpt = i;
2715         }
2716
2717         kiblnd_data.kib_error_qpa.qp_state = IB_QPS_ERR;
2718
2719         /* lists/ptrs/locks initialised */
2720         kiblnd_data.kib_init = IBLND_INIT_DATA;
2721         /*****************************************************/
2722
2723         rc = kiblnd_thread_start(kiblnd_connd, NULL, "kiblnd_connd");
2724         if (rc) {
2725                 CERROR("Can't spawn o2iblnd connd: %d\n", rc);
2726                 goto failed;
2727         }
2728
2729         if (*kiblnd_tunables.kib_dev_failover)
2730                 rc = kiblnd_thread_start(kiblnd_failover_thread, NULL,
2731                                          "kiblnd_failover");
2732
2733         if (rc) {
2734                 CERROR("Can't spawn o2iblnd failover thread: %d\n", rc);
2735                 goto failed;
2736         }
2737
2738         /* flag everything initialised */
2739         kiblnd_data.kib_init = IBLND_INIT_ALL;
2740         /*****************************************************/
2741
2742         return 0;
2743
2744  failed:
2745         kiblnd_base_shutdown();
2746         return -ENETDOWN;
2747 }
2748
2749 static int kiblnd_start_schedulers(struct kib_sched_info *sched)
2750 {
2751         int rc = 0;
2752         int nthrs;
2753         int i;
2754
2755         if (!sched->ibs_nthreads) {
2756                 if (*kiblnd_tunables.kib_nscheds > 0) {
2757                         nthrs = sched->ibs_nthreads_max;
2758                 } else {
2759                         nthrs = cfs_cpt_weight(lnet_cpt_table(),
2760                                                sched->ibs_cpt);
2761                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
2762                         nthrs = min(IBLND_N_SCHED_HIGH, nthrs);
2763                 }
2764         } else {
2765                 LASSERT(sched->ibs_nthreads <= sched->ibs_nthreads_max);
2766                 /* increase one thread if there is new interface */
2767                 nthrs = sched->ibs_nthreads < sched->ibs_nthreads_max;
2768         }
2769
2770         for (i = 0; i < nthrs; i++) {
2771                 long id;
2772                 char name[20];
2773
2774                 id = KIB_THREAD_ID(sched->ibs_cpt, sched->ibs_nthreads + i);
2775                 snprintf(name, sizeof(name), "kiblnd_sd_%02ld_%02ld",
2776                          KIB_THREAD_CPT(id), KIB_THREAD_TID(id));
2777                 rc = kiblnd_thread_start(kiblnd_scheduler, (void *)id, name);
2778                 if (!rc)
2779                         continue;
2780
2781                 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
2782                        sched->ibs_cpt, sched->ibs_nthreads + i, rc);
2783                 break;
2784         }
2785
2786         sched->ibs_nthreads += i;
2787         return rc;
2788 }
2789
2790 static int kiblnd_dev_start_threads(struct kib_dev *dev, int newdev, __u32 *cpts,
2791                                     int ncpts)
2792 {
2793         int cpt;
2794         int rc;
2795         int i;
2796
2797         for (i = 0; i < ncpts; i++) {
2798                 struct kib_sched_info *sched;
2799
2800                 cpt = !cpts ? i : cpts[i];
2801                 sched = kiblnd_data.kib_scheds[cpt];
2802
2803                 if (!newdev && sched->ibs_nthreads > 0)
2804                         continue;
2805
2806                 rc = kiblnd_start_schedulers(kiblnd_data.kib_scheds[cpt]);
2807                 if (rc) {
2808                         CERROR("Failed to start scheduler threads for %s\n",
2809                                dev->ibd_ifname);
2810                         return rc;
2811                 }
2812         }
2813         return 0;
2814 }
2815
2816 static struct kib_dev *kiblnd_dev_search(char *ifname)
2817 {
2818         struct kib_dev *alias = NULL;
2819         struct kib_dev *dev;
2820         char *colon;
2821         char *colon2;
2822
2823         colon = strchr(ifname, ':');
2824         list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
2825                 if (!strcmp(&dev->ibd_ifname[0], ifname))
2826                         return dev;
2827
2828                 if (alias)
2829                         continue;
2830
2831                 colon2 = strchr(dev->ibd_ifname, ':');
2832                 if (colon)
2833                         *colon = 0;
2834                 if (colon2)
2835                         *colon2 = 0;
2836
2837                 if (!strcmp(&dev->ibd_ifname[0], ifname))
2838                         alias = dev;
2839
2840                 if (colon)
2841                         *colon = ':';
2842                 if (colon2)
2843                         *colon2 = ':';
2844         }
2845         return alias;
2846 }
2847
2848 static int kiblnd_startup(struct lnet_ni *ni)
2849 {
2850         char *ifname;
2851         struct kib_dev *ibdev = NULL;
2852         struct kib_net *net;
2853         struct timespec64 tv;
2854         unsigned long flags;
2855         int rc;
2856         int newdev;
2857
2858         LASSERT(ni->ni_lnd == &the_o2iblnd);
2859
2860         if (kiblnd_data.kib_init == IBLND_INIT_NOTHING) {
2861                 rc = kiblnd_base_startup();
2862                 if (rc)
2863                         return rc;
2864         }
2865
2866         LIBCFS_ALLOC(net, sizeof(*net));
2867         ni->ni_data = net;
2868         if (!net)
2869                 goto net_failed;
2870
2871         ktime_get_real_ts64(&tv);
2872         net->ibn_incarnation = tv.tv_sec * USEC_PER_SEC +
2873                                tv.tv_nsec / NSEC_PER_USEC;
2874
2875         rc = kiblnd_tunables_setup(ni);
2876         if (rc)
2877                 goto net_failed;
2878
2879         if (ni->ni_interfaces[0]) {
2880                 /* Use the IPoIB interface specified in 'networks=' */
2881
2882                 BUILD_BUG_ON(LNET_MAX_INTERFACES <= 1);
2883                 if (ni->ni_interfaces[1]) {
2884                         CERROR("Multiple interfaces not supported\n");
2885                         goto failed;
2886                 }
2887
2888                 ifname = ni->ni_interfaces[0];
2889         } else {
2890                 ifname = *kiblnd_tunables.kib_default_ipif;
2891         }
2892
2893         if (strlen(ifname) >= sizeof(ibdev->ibd_ifname)) {
2894                 CERROR("IPoIB interface name too long: %s\n", ifname);
2895                 goto failed;
2896         }
2897
2898         ibdev = kiblnd_dev_search(ifname);
2899
2900         newdev = !ibdev;
2901         /* hmm...create kib_dev even for alias */
2902         if (!ibdev || strcmp(&ibdev->ibd_ifname[0], ifname))
2903                 ibdev = kiblnd_create_dev(ifname);
2904
2905         if (!ibdev)
2906                 goto failed;
2907
2908         net->ibn_dev = ibdev;
2909         ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), ibdev->ibd_ifip);
2910
2911         rc = kiblnd_dev_start_threads(ibdev, newdev,
2912                                       ni->ni_cpts, ni->ni_ncpts);
2913         if (rc)
2914                 goto failed;
2915
2916         rc = kiblnd_net_init_pools(net, ni, ni->ni_cpts, ni->ni_ncpts);
2917         if (rc) {
2918                 CERROR("Failed to initialize NI pools: %d\n", rc);
2919                 goto failed;
2920         }
2921
2922         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2923         ibdev->ibd_nnets++;
2924         list_add_tail(&net->ibn_list, &ibdev->ibd_nets);
2925         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2926
2927         net->ibn_init = IBLND_INIT_ALL;
2928
2929         return 0;
2930
2931 failed:
2932         if (!net->ibn_dev && ibdev)
2933                 kiblnd_destroy_dev(ibdev);
2934
2935 net_failed:
2936         kiblnd_shutdown(ni);
2937
2938         CDEBUG(D_NET, "%s failed\n", __func__);
2939         return -ENETDOWN;
2940 }
2941
2942 static struct lnet_lnd the_o2iblnd = {
2943         .lnd_type       = O2IBLND,
2944         .lnd_startup    = kiblnd_startup,
2945         .lnd_shutdown   = kiblnd_shutdown,
2946         .lnd_ctl        = kiblnd_ctl,
2947         .lnd_query      = kiblnd_query,
2948         .lnd_send       = kiblnd_send,
2949         .lnd_recv       = kiblnd_recv,
2950 };
2951
2952 static void __exit ko2iblnd_exit(void)
2953 {
2954         lnet_unregister_lnd(&the_o2iblnd);
2955 }
2956
2957 static int __init ko2iblnd_init(void)
2958 {
2959         BUILD_BUG_ON(sizeof(struct kib_msg) > IBLND_MSG_SIZE);
2960         BUILD_BUG_ON(offsetof(struct kib_msg,
2961                           ibm_u.get.ibgm_rd.rd_frags[IBLND_MAX_RDMA_FRAGS])
2962                           > IBLND_MSG_SIZE);
2963         BUILD_BUG_ON(offsetof(struct kib_msg,
2964                           ibm_u.putack.ibpam_rd.rd_frags[IBLND_MAX_RDMA_FRAGS])
2965                           > IBLND_MSG_SIZE);
2966
2967         kiblnd_tunables_init();
2968
2969         lnet_register_lnd(&the_o2iblnd);
2970
2971         return 0;
2972 }
2973
2974 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2975 MODULE_DESCRIPTION("OpenIB gen2 LNet Network Driver");
2976 MODULE_VERSION("2.7.0");
2977 MODULE_LICENSE("GPL");
2978
2979 module_init(ko2iblnd_init);
2980 module_exit(ko2iblnd_exit);