lnet/klnds/o2iblnd/o2iblnd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * 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/page.h>
  38 #include <linux/inetdevice.h>
  39
  40 #include "o2iblnd.h"
  41
  42 static struct lnet_lnd the_o2iblnd;
  43
  44 struct kib_data kiblnd_data;
  45
  46 static __u32
  47 kiblnd_cksum (void *ptr, int nob)
  48 {
  49         char  *c  = ptr;
  50         __u32  sum = 0;
  51
  52         while (nob-- > 0)
  53                 sum = ((sum << 1) | (sum >> 31)) + *c++;
  54
  55         /* ensure I don't return 0 (== no checksum) */
  56         return (sum == 0) ? 1 : sum;
  57 }
  58
  59 static char *
  60 kiblnd_msgtype2str(int type)
  61 {
  62         switch (type) {
  63         case IBLND_MSG_CONNREQ:
  64                 return "CONNREQ";
  65
  66         case IBLND_MSG_CONNACK:
  67                 return "CONNACK";
  68
  69         case IBLND_MSG_NOOP:
  70                 return "NOOP";
  71
  72         case IBLND_MSG_IMMEDIATE:
  73                 return "IMMEDIATE";
  74
  75         case IBLND_MSG_PUT_REQ:
  76                 return "PUT_REQ";
  77
  78         case IBLND_MSG_PUT_NAK:
  79                 return "PUT_NAK";
  80
  81         case IBLND_MSG_PUT_ACK:
  82                 return "PUT_ACK";
  83
  84         case IBLND_MSG_PUT_DONE:
  85                 return "PUT_DONE";
  86
  87         case IBLND_MSG_GET_REQ:
  88                 return "GET_REQ";
  89
  90         case IBLND_MSG_GET_DONE:
  91                 return "GET_DONE";
  92
  93         default:
  94                 return "???";
  95         }
  96 }
  97
  98 static int
  99 kiblnd_msgtype2size(int type)
 100 {
 101         const int hdr_size = offsetof(struct kib_msg, ibm_u);
 102
 103         switch (type) {
 104         case IBLND_MSG_CONNREQ:
 105         case IBLND_MSG_CONNACK:
 106                 return hdr_size + sizeof(struct kib_connparams);
 107
 108         case IBLND_MSG_NOOP:
 109                 return hdr_size;
 110
 111         case IBLND_MSG_IMMEDIATE:
 112                 return offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[0]);
 113
 114         case IBLND_MSG_PUT_REQ:
 115                 return hdr_size + sizeof(struct kib_putreq_msg);
 116
 117         case IBLND_MSG_PUT_ACK:
 118                 return hdr_size + sizeof(struct kib_putack_msg);
 119
 120         case IBLND_MSG_GET_REQ:
 121                 return hdr_size + sizeof(struct kib_get_msg);
 122
 123         case IBLND_MSG_PUT_NAK:
 124         case IBLND_MSG_PUT_DONE:
 125         case IBLND_MSG_GET_DONE:
 126                 return hdr_size + sizeof(struct kib_completion_msg);
 127         default:
 128                 return -1;
 129         }
 130 }
 131
 132 static int kiblnd_unpack_rd(struct kib_msg *msg, int flip)
 133 {
 134         struct kib_rdma_desc *rd;
 135         int                nob;
 136         int                n;
 137         int                i;
 138
 139         LASSERT (msg->ibm_type == IBLND_MSG_GET_REQ ||
 140                  msg->ibm_type == IBLND_MSG_PUT_ACK);
 141
 142         rd = msg->ibm_type == IBLND_MSG_GET_REQ ?
 143                               &msg->ibm_u.get.ibgm_rd :
 144                               &msg->ibm_u.putack.ibpam_rd;
 145
 146         if (flip) {
 147                 __swab32s(&rd->rd_key);
 148                 __swab32s(&rd->rd_nfrags);
 149         }
 150
 151         n = rd->rd_nfrags;
 152
 153         if (n <= 0 || n > IBLND_MAX_RDMA_FRAGS) {
 154                 CERROR("Bad nfrags: %d, should be 0 < n <= %d\n",
 155                        n, IBLND_MAX_RDMA_FRAGS);
 156                 return 1;
 157         }
 158
 159         nob = offsetof(struct kib_msg, ibm_u) +
 160               kiblnd_rd_msg_size(rd, msg->ibm_type, n);
 161
 162         if (msg->ibm_nob < nob) {
 163                 CERROR("Short %s: %d(%d)\n",
 164                        kiblnd_msgtype2str(msg->ibm_type), msg->ibm_nob, nob);
 165                 return 1;
 166         }
 167
 168         if (!flip)
 169                 return 0;
 170
 171         for (i = 0; i < n; i++) {
 172                 __swab32s(&rd->rd_frags[i].rf_nob);
 173                 __swab64s(&rd->rd_frags[i].rf_addr);
 174         }
 175
 176         return 0;
 177 }
 178
 179 void kiblnd_pack_msg(struct lnet_ni *ni, struct kib_msg *msg, int version,
 180                      int credits, lnet_nid_t dstnid, __u64 dststamp)
 181 {
 182         struct kib_net *net = ni->ni_data;
 183
 184         /* CAVEAT EMPTOR! all message fields not set here should have been
 185          * initialised previously. */
 186         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         /* checksum must be computed with ibm_cksum zero and BEFORE anything
 245          * gets flipped */
 246         msg_cksum = flip ? __swab32(msg->ibm_cksum) : msg->ibm_cksum;
 247         msg->ibm_cksum = 0;
 248         if (msg_cksum != 0 &&
 249             msg_cksum != kiblnd_cksum(msg, msg_nob)) {
 250                 CERROR("Bad checksum\n");
 251                 return -EPROTO;
 252         }
 253
 254         msg->ibm_cksum = msg_cksum;
 255
 256         if (flip) {
 257                 /* leave magic unflipped as a clue to peer_ni endianness */
 258                 msg->ibm_version = version;
 259                 CLASSERT (sizeof(msg->ibm_type) == 1);
 260                 CLASSERT (sizeof(msg->ibm_credits) == 1);
 261                 msg->ibm_nob     = msg_nob;
 262                 __swab64s(&msg->ibm_srcnid);
 263                 __swab64s(&msg->ibm_srcstamp);
 264                 __swab64s(&msg->ibm_dstnid);
 265                 __swab64s(&msg->ibm_dststamp);
 266         }
 267
 268         if (msg->ibm_srcnid == LNET_NID_ANY) {
 269                 CERROR("Bad src nid: %s\n", libcfs_nid2str(msg->ibm_srcnid));
 270                 return -EPROTO;
 271         }
 272
 273         if (msg_nob < kiblnd_msgtype2size(msg->ibm_type)) {
 274                 CERROR("Short %s: %d(%d)\n", kiblnd_msgtype2str(msg->ibm_type),
 275                        msg_nob, kiblnd_msgtype2size(msg->ibm_type));
 276                 return -EPROTO;
 277         }
 278
 279         switch (msg->ibm_type) {
 280         default:
 281                 CERROR("Unknown message type %x\n", msg->ibm_type);
 282                 return -EPROTO;
 283
 284         case IBLND_MSG_NOOP:
 285         case IBLND_MSG_IMMEDIATE:
 286         case IBLND_MSG_PUT_REQ:
 287                 break;
 288
 289         case IBLND_MSG_PUT_ACK:
 290         case IBLND_MSG_GET_REQ:
 291                 if (kiblnd_unpack_rd(msg, flip))
 292                         return -EPROTO;
 293                 break;
 294
 295         case IBLND_MSG_PUT_NAK:
 296         case IBLND_MSG_PUT_DONE:
 297         case IBLND_MSG_GET_DONE:
 298                 if (flip)
 299                         __swab32s(&msg->ibm_u.completion.ibcm_status);
 300                 break;
 301
 302         case IBLND_MSG_CONNREQ:
 303         case IBLND_MSG_CONNACK:
 304                 if (flip) {
 305                         __swab16s(&msg->ibm_u.connparams.ibcp_queue_depth);
 306                         __swab16s(&msg->ibm_u.connparams.ibcp_max_frags);
 307                         __swab32s(&msg->ibm_u.connparams.ibcp_max_msg_size);
 308                 }
 309                 break;
 310         }
 311         return 0;
 312 }
 313
 314 int
 315 kiblnd_create_peer(struct lnet_ni *ni, struct kib_peer_ni **peerp,
 316                    lnet_nid_t nid)
 317 {
 318         struct kib_peer_ni *peer_ni;
 319         struct kib_net *net = ni->ni_data;
 320         int cpt = lnet_cpt_of_nid(nid, ni);
 321         unsigned long flags;
 322
 323         LASSERT(net != NULL);
 324         LASSERT(nid != LNET_NID_ANY);
 325
 326         LIBCFS_CPT_ALLOC(peer_ni, lnet_cpt_table(), cpt, sizeof(*peer_ni));
 327         if (peer_ni == NULL) {
 328                 CERROR("Cannot allocate peer_ni\n");
 329                 return -ENOMEM;
 330         }
 331
 332         peer_ni->ibp_ni = ni;
 333         peer_ni->ibp_nid = nid;
 334         peer_ni->ibp_error = 0;
 335         peer_ni->ibp_last_alive = 0;
 336         peer_ni->ibp_max_frags = IBLND_MAX_RDMA_FRAGS;
 337         peer_ni->ibp_queue_depth = ni->ni_net->net_tunables.lct_peer_tx_credits;
 338         atomic_set(&peer_ni->ibp_refcount, 1);  /* 1 ref for caller */
 339
 340         INIT_LIST_HEAD(&peer_ni->ibp_list);     /* not in the peer_ni table yet */
 341         INIT_LIST_HEAD(&peer_ni->ibp_conns);
 342         INIT_LIST_HEAD(&peer_ni->ibp_tx_queue);
 343
 344         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 345
 346         /* always called with a ref on ni, which prevents ni being shutdown */
 347         LASSERT(net->ibn_shutdown == 0);
 348
 349         /* npeers only grows with the global lock held */
 350         atomic_inc(&net->ibn_npeers);
 351
 352         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 353
 354         *peerp = peer_ni;
 355         return 0;
 356 }
 357
 358 void
 359 kiblnd_destroy_peer(struct kib_peer_ni *peer_ni)
 360 {
 361         struct kib_net *net = peer_ni->ibp_ni->ni_data;
 362
 363         LASSERT(net != NULL);
 364         LASSERT (atomic_read(&peer_ni->ibp_refcount) == 0);
 365         LASSERT(!kiblnd_peer_active(peer_ni));
 366         LASSERT(kiblnd_peer_idle(peer_ni));
 367         LASSERT(list_empty(&peer_ni->ibp_tx_queue));
 368
 369         LIBCFS_FREE(peer_ni, sizeof(*peer_ni));
 370
 371         /* NB a peer_ni's connections keep a reference on their peer_ni until
 372          * they are destroyed, so we can be assured that _all_ state to do
 373          * with this peer_ni has been cleaned up when its refcount drops to
 374          * zero. */
 375         atomic_dec(&net->ibn_npeers);
 376 }
 377
 378 struct kib_peer_ni *
 379 kiblnd_find_peer_locked(struct lnet_ni *ni, lnet_nid_t nid)
 380 {
 381         /* the caller is responsible for accounting the additional reference
 382          * that this creates */
 383         struct list_head        *peer_list = kiblnd_nid2peerlist(nid);
 384         struct list_head        *tmp;
 385         struct kib_peer_ni              *peer_ni;
 386
 387         list_for_each(tmp, peer_list) {
 388
 389                 peer_ni = list_entry(tmp, struct kib_peer_ni, ibp_list);
 390                 LASSERT(!kiblnd_peer_idle(peer_ni));
 391
 392                 /*
 393                  * Match a peer if its NID and the NID of the local NI it
 394                  * communicates over are the same. Otherwise don't match
 395                  * the peer, which will result in a new lnd peer being
 396                  * created.
 397                  */
 398                 if (peer_ni->ibp_nid != nid ||
 399                     peer_ni->ibp_ni->ni_nid != ni->ni_nid)
 400                         continue;
 401
 402                 CDEBUG(D_NET, "got peer_ni [%p] -> %s (%d) version: %x\n",
 403                        peer_ni, libcfs_nid2str(nid),
 404                        atomic_read(&peer_ni->ibp_refcount),
 405                        peer_ni->ibp_version);
 406                 return peer_ni;
 407         }
 408         return NULL;
 409 }
 410
 411 void
 412 kiblnd_unlink_peer_locked(struct kib_peer_ni *peer_ni)
 413 {
 414         LASSERT(list_empty(&peer_ni->ibp_conns));
 415
 416         LASSERT (kiblnd_peer_active(peer_ni));
 417         list_del_init(&peer_ni->ibp_list);
 418         /* lose peerlist's ref */
 419         kiblnd_peer_decref(peer_ni);
 420 }
 421
 422 static int
 423 kiblnd_get_peer_info(struct lnet_ni *ni, int index,
 424                      lnet_nid_t *nidp, int *count)
 425 {
 426         struct kib_peer_ni              *peer_ni;
 427         struct list_head        *ptmp;
 428         int                      i;
 429         unsigned long            flags;
 430
 431         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 432
 433         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
 434
 435                 list_for_each(ptmp, &kiblnd_data.kib_peers[i]) {
 436
 437                         peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);
 438                         LASSERT(!kiblnd_peer_idle(peer_ni));
 439
 440                         if (peer_ni->ibp_ni != ni)
 441                                 continue;
 442
 443                         if (index-- > 0)
 444                                 continue;
 445
 446                         *nidp = peer_ni->ibp_nid;
 447                         *count = atomic_read(&peer_ni->ibp_refcount);
 448
 449                         read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
 450                                                flags);
 451                         return 0;
 452                 }
 453         }
 454
 455         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 456         return -ENOENT;
 457 }
 458
 459 static void
 460 kiblnd_del_peer_locked(struct kib_peer_ni *peer_ni)
 461 {
 462         struct list_head *ctmp;
 463         struct list_head *cnxt;
 464         struct kib_conn *conn;
 465
 466         if (list_empty(&peer_ni->ibp_conns)) {
 467                 kiblnd_unlink_peer_locked(peer_ni);
 468         } else {
 469                 list_for_each_safe(ctmp, cnxt, &peer_ni->ibp_conns) {
 470                         conn = list_entry(ctmp, struct kib_conn, ibc_list);
 471
 472                         kiblnd_close_conn_locked(conn, 0);
 473                 }
 474                 /* NB closing peer_ni's last conn unlinked it. */
 475         }
 476         /* NB peer_ni now unlinked; might even be freed if the peer_ni table had the
 477          * last ref on it. */
 478 }
 479
 480 static int
 481 kiblnd_del_peer(struct lnet_ni *ni, lnet_nid_t nid)
 482 {
 483         struct list_head        zombies = LIST_HEAD_INIT(zombies);
 484         struct list_head        *ptmp;
 485         struct list_head        *pnxt;
 486         struct kib_peer_ni              *peer_ni;
 487         int                     lo;
 488         int                     hi;
 489         int                     i;
 490         unsigned long           flags;
 491         int                     rc = -ENOENT;
 492
 493         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 494
 495         if (nid != LNET_NID_ANY) {
 496                 lo = hi = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
 497         } else {
 498                 lo = 0;
 499                 hi = kiblnd_data.kib_peer_hash_size - 1;
 500         }
 501
 502         for (i = lo; i <= hi; i++) {
 503                 list_for_each_safe(ptmp, pnxt, &kiblnd_data.kib_peers[i]) {
 504                         peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);
 505                         LASSERT(!kiblnd_peer_idle(peer_ni));
 506
 507                         if (peer_ni->ibp_ni != ni)
 508                                 continue;
 509
 510                         if (!(nid == LNET_NID_ANY || peer_ni->ibp_nid == nid))
 511                                 continue;
 512
 513                         if (!list_empty(&peer_ni->ibp_tx_queue)) {
 514                                 LASSERT(list_empty(&peer_ni->ibp_conns));
 515
 516                                 list_splice_init(&peer_ni->ibp_tx_queue,
 517                                                  &zombies);
 518                         }
 519
 520                         kiblnd_del_peer_locked(peer_ni);
 521                         rc = 0;         /* matched something */
 522                 }
 523         }
 524
 525         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 526
 527         kiblnd_txlist_done(&zombies, -EIO, LNET_MSG_STATUS_LOCAL_ERROR);
 528
 529         return rc;
 530 }
 531
 532 static struct kib_conn *
 533 kiblnd_get_conn_by_idx(struct lnet_ni *ni, int index)
 534 {
 535         struct kib_peer_ni              *peer_ni;
 536         struct list_head        *ptmp;
 537         struct kib_conn *conn;
 538         struct list_head        *ctmp;
 539         int                     i;
 540         unsigned long           flags;
 541
 542         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 543
 544         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
 545                 list_for_each(ptmp, &kiblnd_data.kib_peers[i]) {
 546
 547                         peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);
 548                         LASSERT(!kiblnd_peer_idle(peer_ni));
 549
 550                         if (peer_ni->ibp_ni != ni)
 551                                 continue;
 552
 553                         list_for_each(ctmp, &peer_ni->ibp_conns) {
 554                                 if (index-- > 0)
 555                                         continue;
 556
 557                                 conn = list_entry(ctmp, struct kib_conn, ibc_list);
 558                                 kiblnd_conn_addref(conn);
 559                                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
 560                                                        flags);
 561                                 return conn;
 562                         }
 563                 }
 564         }
 565
 566         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 567         return NULL;
 568 }
 569
 570 static void
 571 kiblnd_debug_rx(struct kib_rx *rx)
 572 {
 573         CDEBUG(D_CONSOLE, "      %p msg_type %x cred %d\n",
 574                rx, rx->rx_msg->ibm_type,
 575                rx->rx_msg->ibm_credits);
 576 }
 577
 578 static void
 579 kiblnd_debug_tx(struct kib_tx *tx)
 580 {
 581         CDEBUG(D_CONSOLE, "      %p snd %d q %d w %d rc %d dl %lld "
 582                "cookie %#llx msg %s%s type %x cred %d\n",
 583                tx, tx->tx_sending, tx->tx_queued, tx->tx_waiting,
 584                tx->tx_status, ktime_to_ns(tx->tx_deadline), tx->tx_cookie,
 585                tx->tx_lntmsg[0] == NULL ? "-" : "!",
 586                tx->tx_lntmsg[1] == NULL ? "-" : "!",
 587                tx->tx_msg->ibm_type, tx->tx_msg->ibm_credits);
 588 }
 589
 590 void
 591 kiblnd_debug_conn(struct kib_conn *conn)
 592 {
 593         struct list_head        *tmp;
 594         int                     i;
 595
 596         spin_lock(&conn->ibc_lock);
 597
 598         CDEBUG(D_CONSOLE, "conn[%d] %p [version %x] -> %s:\n",
 599                atomic_read(&conn->ibc_refcount), conn,
 600                conn->ibc_version, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 601         CDEBUG(D_CONSOLE, "   state %d nposted %d/%d cred %d o_cred %d "
 602                " r_cred %d\n", conn->ibc_state, conn->ibc_noops_posted,
 603                conn->ibc_nsends_posted, conn->ibc_credits,
 604                conn->ibc_outstanding_credits, conn->ibc_reserved_credits);
 605         CDEBUG(D_CONSOLE, "   comms_err %d\n", conn->ibc_comms_error);
 606
 607         CDEBUG(D_CONSOLE, "   early_rxs:\n");
 608         list_for_each(tmp, &conn->ibc_early_rxs)
 609                 kiblnd_debug_rx(list_entry(tmp, struct kib_rx, rx_list));
 610
 611         CDEBUG(D_CONSOLE, "   tx_noops:\n");
 612         list_for_each(tmp, &conn->ibc_tx_noops)
 613                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 614
 615         CDEBUG(D_CONSOLE, "   tx_queue_nocred:\n");
 616         list_for_each(tmp, &conn->ibc_tx_queue_nocred)
 617                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 618
 619         CDEBUG(D_CONSOLE, "   tx_queue_rsrvd:\n");
 620         list_for_each(tmp, &conn->ibc_tx_queue_rsrvd)
 621                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 622
 623         CDEBUG(D_CONSOLE, "   tx_queue:\n");
 624         list_for_each(tmp, &conn->ibc_tx_queue)
 625                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 626
 627         CDEBUG(D_CONSOLE, "   active_txs:\n");
 628         list_for_each(tmp, &conn->ibc_active_txs)
 629                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 630
 631         CDEBUG(D_CONSOLE, "   rxs:\n");
 632         for (i = 0; i < IBLND_RX_MSGS(conn); i++)
 633                 kiblnd_debug_rx(&conn->ibc_rxs[i]);
 634
 635         spin_unlock(&conn->ibc_lock);
 636 }
 637
 638 int
 639 kiblnd_translate_mtu(int value)
 640 {
 641         switch (value) {
 642         default:
 643                 return -1;
 644         case 0:
 645                 return 0;
 646         case 256:
 647                 return IB_MTU_256;
 648         case 512:
 649                 return IB_MTU_512;
 650         case 1024:
 651                 return IB_MTU_1024;
 652         case 2048:
 653                 return IB_MTU_2048;
 654         case 4096:
 655                 return IB_MTU_4096;
 656         }
 657 }
 658
 659 static void
 660 kiblnd_setup_mtu_locked(struct rdma_cm_id *cmid)
 661 {
 662         int           mtu;
 663
 664         /* XXX There is no path record for iWARP, set by netdev->change_mtu? */
 665         if (cmid->route.path_rec == NULL)
 666                 return;
 667
 668         mtu = kiblnd_translate_mtu(*kiblnd_tunables.kib_ib_mtu);
 669         LASSERT (mtu >= 0);
 670         if (mtu != 0)
 671                 cmid->route.path_rec->mtu = mtu;
 672 }
 673
 674 static int
 675 kiblnd_get_completion_vector(struct kib_conn *conn, int cpt)
 676 {
 677         cpumask_var_t   *mask;
 678         int             vectors;
 679         int             off;
 680         int             i;
 681         lnet_nid_t      ibp_nid;
 682
 683         vectors = conn->ibc_cmid->device->num_comp_vectors;
 684         if (vectors <= 1)
 685                 return 0;
 686
 687         mask = cfs_cpt_cpumask(lnet_cpt_table(), cpt);
 688
 689         /* hash NID to CPU id in this partition... */
 690         ibp_nid = conn->ibc_peer->ibp_nid;
 691         off = do_div(ibp_nid, cpumask_weight(*mask));
 692         for_each_cpu(i, *mask) {
 693                 if (off-- == 0)
 694                         return i % vectors;
 695         }
 696
 697         LBUG();
 698         return 1;
 699 }
 700
 701 /*
 702  * Get the scheduler bound to this CPT. If the scheduler has no
 703  * threads, which means that the CPT has no CPUs, then grab the
 704  * next scheduler that we can use.
 705  *
 706  * This case would be triggered if a NUMA node is configured with
 707  * no associated CPUs.
 708  */
 709 static struct kib_sched_info *
 710 kiblnd_get_scheduler(int cpt)
 711 {
 712         struct kib_sched_info *sched;
 713         int i;
 714
 715         sched = kiblnd_data.kib_scheds[cpt];
 716
 717         if (sched->ibs_nthreads > 0)
 718                 return sched;
 719
 720         cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
 721                 if (sched->ibs_nthreads > 0) {
 722                         CDEBUG(D_NET, "scheduler[%d] has no threads. selected scheduler[%d]\n",
 723                                         cpt, sched->ibs_cpt);
 724                         return sched;
 725                 }
 726         }
 727
 728         return NULL;
 729 }
 730
 731 static unsigned int kiblnd_send_wrs(struct kib_conn *conn)
 732 {
 733         /*
 734          * One WR for the LNet message
 735          * And ibc_max_frags for the transfer WRs
 736          */
 737         unsigned int ret = 1 + conn->ibc_max_frags;
 738         enum kib_dev_caps dev_caps = conn->ibc_hdev->ibh_dev->ibd_dev_caps;
 739
 740         /* FastReg needs two extra WRs for map and invalidate */
 741         if (dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED)
 742                 ret += 2;
 743
 744         /* account for a maximum of ibc_queue_depth in-flight transfers */
 745         ret *= conn->ibc_queue_depth;
 746         return ret;
 747 }
 748
 749 struct kib_conn *
 750 kiblnd_create_conn(struct kib_peer_ni *peer_ni, struct rdma_cm_id *cmid,
 751                    int state, int version)
 752 {
 753         /* CAVEAT EMPTOR:
 754          * If the new conn is created successfully it takes over the caller's
 755          * ref on 'peer_ni'.  It also "owns" 'cmid' and destroys it when it itself
 756          * is destroyed.  On failure, the caller's ref on 'peer_ni' remains and
 757          * she must dispose of 'cmid'.  (Actually I'd block forever if I tried
 758          * to destroy 'cmid' here since I'm called from the CM which still has
 759          * its ref on 'cmid'). */
 760         rwlock_t               *glock = &kiblnd_data.kib_global_lock;
 761         struct kib_net              *net = peer_ni->ibp_ni->ni_data;
 762         struct kib_dev *dev;
 763         struct ib_qp_init_attr *init_qp_attr;
 764         struct kib_sched_info   *sched;
 765 #ifdef HAVE_IB_CQ_INIT_ATTR
 766         struct ib_cq_init_attr  cq_attr = {};
 767 #endif
 768         struct kib_conn *conn;
 769         struct ib_cq            *cq;
 770         unsigned long           flags;
 771         int                     cpt;
 772         int                     rc;
 773         int                     i;
 774
 775         LASSERT(net != NULL);
 776         LASSERT(!in_interrupt());
 777
 778         dev = net->ibn_dev;
 779
 780         cpt = lnet_cpt_of_nid(peer_ni->ibp_nid, peer_ni->ibp_ni);
 781         sched = kiblnd_get_scheduler(cpt);
 782
 783         if (sched == NULL) {
 784                 CERROR("no schedulers available. node is unhealthy\n");
 785                 goto failed_0;
 786         }
 787
 788         /*
 789          * The cpt might have changed if we ended up selecting a non cpt
 790          * native scheduler. So use the scheduler's cpt instead.
 791          */
 792         cpt = sched->ibs_cpt;
 793
 794         LIBCFS_CPT_ALLOC(init_qp_attr, lnet_cpt_table(), cpt,
 795                          sizeof(*init_qp_attr));
 796         if (init_qp_attr == NULL) {
 797                 CERROR("Can't allocate qp_attr for %s\n",
 798                        libcfs_nid2str(peer_ni->ibp_nid));
 799                 goto failed_0;
 800         }
 801
 802         LIBCFS_CPT_ALLOC(conn, lnet_cpt_table(), cpt, sizeof(*conn));
 803         if (conn == NULL) {
 804                 CERROR("Can't allocate connection for %s\n",
 805                        libcfs_nid2str(peer_ni->ibp_nid));
 806                 goto failed_1;
 807         }
 808
 809         conn->ibc_state = IBLND_CONN_INIT;
 810         conn->ibc_version = version;
 811         conn->ibc_peer = peer_ni;                       /* I take the caller's ref */
 812         cmid->context = conn;                   /* for future CM callbacks */
 813         conn->ibc_cmid = cmid;
 814         conn->ibc_max_frags = peer_ni->ibp_max_frags;
 815         conn->ibc_queue_depth = peer_ni->ibp_queue_depth;
 816         conn->ibc_rxs = NULL;
 817         conn->ibc_rx_pages = NULL;
 818
 819         INIT_LIST_HEAD(&conn->ibc_early_rxs);
 820         INIT_LIST_HEAD(&conn->ibc_tx_noops);
 821         INIT_LIST_HEAD(&conn->ibc_tx_queue);
 822         INIT_LIST_HEAD(&conn->ibc_tx_queue_rsrvd);
 823         INIT_LIST_HEAD(&conn->ibc_tx_queue_nocred);
 824         INIT_LIST_HEAD(&conn->ibc_active_txs);
 825         INIT_LIST_HEAD(&conn->ibc_zombie_txs);
 826         spin_lock_init(&conn->ibc_lock);
 827
 828         LIBCFS_CPT_ALLOC(conn->ibc_connvars, lnet_cpt_table(), cpt,
 829                          sizeof(*conn->ibc_connvars));
 830         if (conn->ibc_connvars == NULL) {
 831                 CERROR("Can't allocate in-progress connection state\n");
 832                 goto failed_2;
 833         }
 834
 835         write_lock_irqsave(glock, flags);
 836         if (dev->ibd_failover) {
 837                 write_unlock_irqrestore(glock, flags);
 838                 CERROR("%s: failover in progress\n", dev->ibd_ifname);
 839                 goto failed_2;
 840         }
 841
 842         if (dev->ibd_hdev->ibh_ibdev != cmid->device) {
 843                 /* wakeup failover thread and teardown connection */
 844                 if (kiblnd_dev_can_failover(dev)) {
 845                         list_add_tail(&dev->ibd_fail_list,
 846                                       &kiblnd_data.kib_failed_devs);
 847                         wake_up(&kiblnd_data.kib_failover_waitq);
 848                 }
 849
 850                 write_unlock_irqrestore(glock, flags);
 851                 CERROR("cmid HCA(%s), kib_dev(%s) need failover\n",
 852                        cmid->device->name, dev->ibd_ifname);
 853                 goto failed_2;
 854         }
 855
 856         kiblnd_hdev_addref_locked(dev->ibd_hdev);
 857         conn->ibc_hdev = dev->ibd_hdev;
 858
 859         kiblnd_setup_mtu_locked(cmid);
 860
 861         write_unlock_irqrestore(glock, flags);
 862
 863 #ifdef HAVE_IB_CQ_INIT_ATTR
 864         cq_attr.cqe = IBLND_CQ_ENTRIES(conn);
 865         cq_attr.comp_vector = kiblnd_get_completion_vector(conn, cpt);
 866         cq = ib_create_cq(cmid->device,
 867                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 868                           &cq_attr);
 869 #else
 870         cq = ib_create_cq(cmid->device,
 871                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 872                           IBLND_CQ_ENTRIES(conn),
 873                           kiblnd_get_completion_vector(conn, cpt));
 874 #endif
 875         if (IS_ERR(cq)) {
 876                 /*
 877                  * on MLX-5 (possibly MLX-4 as well) this error could be
 878                  * hit if the concurrent_sends and/or peer_tx_credits is set
 879                  * too high. Or due to an MLX-5 bug which tries to
 880                  * allocate 256kb via kmalloc for WR cookie array
 881                  */
 882                 CERROR("Failed to create CQ with %d CQEs: %ld\n",
 883                         IBLND_CQ_ENTRIES(conn), PTR_ERR(cq));
 884                 goto failed_2;
 885         }
 886
 887         conn->ibc_cq = cq;
 888
 889         rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 890         if (rc != 0) {
 891                 CERROR("Can't request completion notification: %d\n", rc);
 892                 goto failed_2;
 893         }
 894
 895         init_qp_attr->event_handler = kiblnd_qp_event;
 896         init_qp_attr->qp_context = conn;
 897         init_qp_attr->cap.max_send_sge = *kiblnd_tunables.kib_wrq_sge;
 898         init_qp_attr->cap.max_recv_sge = 1;
 899         init_qp_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
 900         init_qp_attr->qp_type = IB_QPT_RC;
 901         init_qp_attr->send_cq = cq;
 902         init_qp_attr->recv_cq = cq;
 903
 904         conn->ibc_sched = sched;
 905
 906         do {
 907                 init_qp_attr->cap.max_send_wr = kiblnd_send_wrs(conn);
 908                 init_qp_attr->cap.max_recv_wr = IBLND_RECV_WRS(conn);
 909
 910                 rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd, init_qp_attr);
 911                 if (!rc || conn->ibc_queue_depth < 2)
 912                         break;
 913
 914                 conn->ibc_queue_depth--;
 915         } while (rc);
 916
 917         if (rc) {
 918                 CERROR("Can't create QP: %d, send_wr: %d, recv_wr: %d, "
 919                        "send_sge: %d, recv_sge: %d\n",
 920                        rc, init_qp_attr->cap.max_send_wr,
 921                        init_qp_attr->cap.max_recv_wr,
 922                        init_qp_attr->cap.max_send_sge,
 923                        init_qp_attr->cap.max_recv_sge);
 924                 goto failed_2;
 925         }
 926
 927         if (conn->ibc_queue_depth != peer_ni->ibp_queue_depth)
 928                 CWARN("peer %s - queue depth reduced from %u to %u"
 929                       "  to allow for qp creation\n",
 930                       libcfs_nid2str(peer_ni->ibp_nid),
 931                       peer_ni->ibp_queue_depth,
 932                       conn->ibc_queue_depth);
 933
 934         LIBCFS_CPT_ALLOC(conn->ibc_rxs, lnet_cpt_table(), cpt,
 935                          IBLND_RX_MSGS(conn) * sizeof(struct kib_rx));
 936         if (conn->ibc_rxs == NULL) {
 937                 CERROR("Cannot allocate RX buffers\n");
 938                 goto failed_2;
 939         }
 940
 941         rc = kiblnd_alloc_pages(&conn->ibc_rx_pages, cpt,
 942                                 IBLND_RX_MSG_PAGES(conn));
 943         if (rc != 0)
 944                 goto failed_2;
 945
 946         kiblnd_map_rx_descs(conn);
 947
 948         LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
 949
 950         /* 1 ref for caller and each rxmsg */
 951         atomic_set(&conn->ibc_refcount, 1 + IBLND_RX_MSGS(conn));
 952         conn->ibc_nrx = IBLND_RX_MSGS(conn);
 953
 954         /* post receives */
 955         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
 956                 rc = kiblnd_post_rx(&conn->ibc_rxs[i], IBLND_POSTRX_NO_CREDIT);
 957                 if (rc != 0) {
 958                         CERROR("Can't post rxmsg: %d\n", rc);
 959
 960                         /* Make posted receives complete */
 961                         kiblnd_abort_receives(conn);
 962
 963                         /* correct # of posted buffers
 964                          * NB locking needed now I'm racing with completion */
 965                         spin_lock_irqsave(&sched->ibs_lock, flags);
 966                         conn->ibc_nrx -= IBLND_RX_MSGS(conn) - i;
 967                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
 968
 969                         /* cmid will be destroyed by CM(ofed) after cm_callback
 970                          * returned, so we can't refer it anymore
 971                          * (by kiblnd_connd()->kiblnd_destroy_conn) */
 972                         rdma_destroy_qp(conn->ibc_cmid);
 973                         conn->ibc_cmid = NULL;
 974
 975                         /* Drop my own and unused rxbuffer refcounts */
 976                         while (i++ <= IBLND_RX_MSGS(conn))
 977                                 kiblnd_conn_decref(conn);
 978
 979                         return NULL;
 980                 }
 981         }
 982
 983         /* Init successful! */
 984         LASSERT (state == IBLND_CONN_ACTIVE_CONNECT ||
 985                  state == IBLND_CONN_PASSIVE_WAIT);
 986         conn->ibc_state = state;
 987
 988         /* 1 more conn */
 989         atomic_inc(&net->ibn_nconns);
 990         return conn;
 991
 992  failed_2:
 993         kiblnd_destroy_conn(conn);
 994         LIBCFS_FREE(conn, sizeof(*conn));
 995  failed_1:
 996         LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
 997  failed_0:
 998         return NULL;
 999 }
1000
1001 void
1002 kiblnd_destroy_conn(struct kib_conn *conn)
1003 {
1004         struct rdma_cm_id *cmid = conn->ibc_cmid;
1005         struct kib_peer_ni        *peer_ni = conn->ibc_peer;
1006         int                rc;
1007
1008         LASSERT (!in_interrupt());
1009         LASSERT (atomic_read(&conn->ibc_refcount) == 0);
1010         LASSERT(list_empty(&conn->ibc_early_rxs));
1011         LASSERT(list_empty(&conn->ibc_tx_noops));
1012         LASSERT(list_empty(&conn->ibc_tx_queue));
1013         LASSERT(list_empty(&conn->ibc_tx_queue_rsrvd));
1014         LASSERT(list_empty(&conn->ibc_tx_queue_nocred));
1015         LASSERT(list_empty(&conn->ibc_active_txs));
1016         LASSERT (conn->ibc_noops_posted == 0);
1017         LASSERT (conn->ibc_nsends_posted == 0);
1018
1019         switch (conn->ibc_state) {
1020         default:
1021                 /* conn must be completely disengaged from the network */
1022                 LBUG();
1023
1024         case IBLND_CONN_DISCONNECTED:
1025                 /* connvars should have been freed already */
1026                 LASSERT (conn->ibc_connvars == NULL);
1027                 break;
1028
1029         case IBLND_CONN_INIT:
1030                 break;
1031         }
1032
1033         /* conn->ibc_cmid might be destroyed by CM already */
1034         if (cmid != NULL && cmid->qp != NULL)
1035                 rdma_destroy_qp(cmid);
1036
1037         if (conn->ibc_cq != NULL) {
1038                 rc = ib_destroy_cq(conn->ibc_cq);
1039                 if (rc != 0)
1040                         CWARN("Error destroying CQ: %d\n", rc);
1041         }
1042
1043         kiblnd_txlist_done(&conn->ibc_zombie_txs, -ECONNABORTED,
1044                            LNET_MSG_STATUS_OK);
1045
1046         if (conn->ibc_rx_pages != NULL)
1047                 kiblnd_unmap_rx_descs(conn);
1048
1049         if (conn->ibc_rxs != NULL) {
1050                 LIBCFS_FREE(conn->ibc_rxs,
1051                             IBLND_RX_MSGS(conn) * sizeof(struct kib_rx));
1052         }
1053
1054         if (conn->ibc_connvars != NULL)
1055                 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
1056
1057         if (conn->ibc_hdev != NULL)
1058                 kiblnd_hdev_decref(conn->ibc_hdev);
1059
1060         /* See CAVEAT EMPTOR above in kiblnd_create_conn */
1061         if (conn->ibc_state != IBLND_CONN_INIT) {
1062                 struct kib_net *net = peer_ni->ibp_ni->ni_data;
1063
1064                 kiblnd_peer_decref(peer_ni);
1065                 rdma_destroy_id(cmid);
1066                 atomic_dec(&net->ibn_nconns);
1067         }
1068 }
1069
1070 int
1071 kiblnd_close_peer_conns_locked(struct kib_peer_ni *peer_ni, int why)
1072 {
1073         struct kib_conn *conn;
1074         struct list_head        *ctmp;
1075         struct list_head        *cnxt;
1076         int                     count = 0;
1077
1078         list_for_each_safe(ctmp, cnxt, &peer_ni->ibp_conns) {
1079                 conn = list_entry(ctmp, struct kib_conn, ibc_list);
1080
1081                 CDEBUG(D_NET, "Closing conn -> %s, "
1082                               "version: %x, reason: %d\n",
1083                        libcfs_nid2str(peer_ni->ibp_nid),
1084                        conn->ibc_version, why);
1085
1086                 kiblnd_close_conn_locked(conn, why);
1087                 count++;
1088         }
1089
1090         return count;
1091 }
1092
1093 int
1094 kiblnd_close_stale_conns_locked(struct kib_peer_ni *peer_ni,
1095                                 int version, __u64 incarnation)
1096 {
1097         struct kib_conn *conn;
1098         struct list_head        *ctmp;
1099         struct list_head        *cnxt;
1100         int                     count = 0;
1101
1102         list_for_each_safe(ctmp, cnxt, &peer_ni->ibp_conns) {
1103                 conn = list_entry(ctmp, struct kib_conn, ibc_list);
1104
1105                 if (conn->ibc_version     == version &&
1106                     conn->ibc_incarnation == incarnation)
1107                         continue;
1108
1109                 CDEBUG(D_NET, "Closing stale conn -> %s version: %x, "
1110                               "incarnation:%#llx(%x, %#llx)\n",
1111                        libcfs_nid2str(peer_ni->ibp_nid),
1112                        conn->ibc_version, conn->ibc_incarnation,
1113                        version, incarnation);
1114
1115                 kiblnd_close_conn_locked(conn, -ESTALE);
1116                 count++;
1117         }
1118
1119         return count;
1120 }
1121
1122 static int
1123 kiblnd_close_matching_conns(struct lnet_ni *ni, lnet_nid_t nid)
1124 {
1125         struct kib_peer_ni              *peer_ni;
1126         struct list_head        *ptmp;
1127         struct list_head        *pnxt;
1128         int                     lo;
1129         int                     hi;
1130         int                     i;
1131         unsigned long           flags;
1132         int                     count = 0;
1133
1134         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1135
1136         if (nid != LNET_NID_ANY)
1137                 lo = hi = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
1138         else {
1139                 lo = 0;
1140                 hi = kiblnd_data.kib_peer_hash_size - 1;
1141         }
1142
1143         for (i = lo; i <= hi; i++) {
1144                 list_for_each_safe(ptmp, pnxt, &kiblnd_data.kib_peers[i]) {
1145
1146                         peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);
1147                         LASSERT(!kiblnd_peer_idle(peer_ni));
1148
1149                         if (peer_ni->ibp_ni != ni)
1150                                 continue;
1151
1152                         if (!(nid == LNET_NID_ANY || nid == peer_ni->ibp_nid))
1153                                 continue;
1154
1155                         count += kiblnd_close_peer_conns_locked(peer_ni, 0);
1156                 }
1157         }
1158
1159         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1160
1161         /* wildcards always succeed */
1162         if (nid == LNET_NID_ANY)
1163                 return 0;
1164
1165         return (count == 0) ? -ENOENT : 0;
1166 }
1167
1168 static int
1169 kiblnd_ctl(struct lnet_ni *ni, unsigned int cmd, void *arg)
1170 {
1171         struct libcfs_ioctl_data *data = arg;
1172         int                       rc = -EINVAL;
1173
1174         switch(cmd) {
1175         case IOC_LIBCFS_GET_PEER: {
1176                 lnet_nid_t   nid = 0;
1177                 int          count = 0;
1178
1179                 rc = kiblnd_get_peer_info(ni, data->ioc_count,
1180                                           &nid, &count);
1181                 data->ioc_nid    = nid;
1182                 data->ioc_count  = count;
1183                 break;
1184         }
1185
1186         case IOC_LIBCFS_DEL_PEER: {
1187                 rc = kiblnd_del_peer(ni, data->ioc_nid);
1188                 break;
1189         }
1190         case IOC_LIBCFS_GET_CONN: {
1191                 struct kib_conn *conn;
1192
1193                 rc = 0;
1194                 conn = kiblnd_get_conn_by_idx(ni, data->ioc_count);
1195                 if (conn == NULL) {
1196                         rc = -ENOENT;
1197                         break;
1198                 }
1199
1200                 LASSERT(conn->ibc_cmid != NULL);
1201                 data->ioc_nid = conn->ibc_peer->ibp_nid;
1202                 if (conn->ibc_cmid->route.path_rec == NULL)
1203                         data->ioc_u32[0] = 0; /* iWarp has no path MTU */
1204                 else
1205                         data->ioc_u32[0] =
1206                         ib_mtu_enum_to_int(conn->ibc_cmid->route.path_rec->mtu);
1207                 kiblnd_conn_decref(conn);
1208                 break;
1209         }
1210         case IOC_LIBCFS_CLOSE_CONNECTION: {
1211                 rc = kiblnd_close_matching_conns(ni, data->ioc_nid);
1212                 break;
1213         }
1214
1215         default:
1216                 break;
1217         }
1218
1219         return rc;
1220 }
1221
1222 static void
1223 kiblnd_query(struct lnet_ni *ni, lnet_nid_t nid, time64_t *when)
1224 {
1225         time64_t last_alive = 0;
1226         time64_t now = ktime_get_seconds();
1227         rwlock_t *glock = &kiblnd_data.kib_global_lock;
1228         struct kib_peer_ni *peer_ni;
1229         unsigned long flags;
1230
1231         read_lock_irqsave(glock, flags);
1232
1233         peer_ni = kiblnd_find_peer_locked(ni, nid);
1234         if (peer_ni != NULL)
1235                 last_alive = peer_ni->ibp_last_alive;
1236
1237         read_unlock_irqrestore(glock, flags);
1238
1239         if (last_alive != 0)
1240                 *when = last_alive;
1241
1242         /* peer_ni is not persistent in hash, trigger peer_ni creation
1243          * and connection establishment with a NULL tx */
1244         if (peer_ni == NULL)
1245                 kiblnd_launch_tx(ni, NULL, nid);
1246
1247         CDEBUG(D_NET, "peer_ni %s %p, alive %lld secs ago\n",
1248                libcfs_nid2str(nid), peer_ni,
1249                last_alive ? now - last_alive : -1);
1250         return;
1251 }
1252
1253 static void
1254 kiblnd_free_pages(struct kib_pages *p)
1255 {
1256         int     npages = p->ibp_npages;
1257         int     i;
1258
1259         for (i = 0; i < npages; i++) {
1260                 if (p->ibp_pages[i] != NULL)
1261                         __free_page(p->ibp_pages[i]);
1262         }
1263
1264         LIBCFS_FREE(p, offsetof(struct kib_pages, ibp_pages[npages]));
1265 }
1266
1267 int
1268 kiblnd_alloc_pages(struct kib_pages **pp, int cpt, int npages)
1269 {
1270         struct kib_pages *p;
1271         int i;
1272
1273         LIBCFS_CPT_ALLOC(p, lnet_cpt_table(), cpt,
1274                          offsetof(struct kib_pages, ibp_pages[npages]));
1275         if (p == NULL) {
1276                 CERROR("Can't allocate descriptor for %d pages\n", npages);
1277                 return -ENOMEM;
1278         }
1279
1280         memset(p, 0, offsetof(struct kib_pages, ibp_pages[npages]));
1281         p->ibp_npages = npages;
1282
1283         for (i = 0; i < npages; i++) {
1284                 p->ibp_pages[i] = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1285                                                      GFP_NOFS);
1286                 if (p->ibp_pages[i] == NULL) {
1287                         CERROR("Can't allocate page %d of %d\n", i, npages);
1288                         kiblnd_free_pages(p);
1289                         return -ENOMEM;
1290                 }
1291         }
1292
1293         *pp = p;
1294         return 0;
1295 }
1296
1297 void
1298 kiblnd_unmap_rx_descs(struct kib_conn *conn)
1299 {
1300         struct kib_rx *rx;
1301         int       i;
1302
1303         LASSERT (conn->ibc_rxs != NULL);
1304         LASSERT (conn->ibc_hdev != NULL);
1305
1306         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
1307                 rx = &conn->ibc_rxs[i];
1308
1309                 LASSERT(rx->rx_nob >= 0); /* not posted */
1310
1311                 kiblnd_dma_unmap_single(conn->ibc_hdev->ibh_ibdev,
1312                                         KIBLND_UNMAP_ADDR(rx, rx_msgunmap,
1313                                                           rx->rx_msgaddr),
1314                                         IBLND_MSG_SIZE, DMA_FROM_DEVICE);
1315         }
1316
1317         kiblnd_free_pages(conn->ibc_rx_pages);
1318
1319         conn->ibc_rx_pages = NULL;
1320 }
1321
1322 void
1323 kiblnd_map_rx_descs(struct kib_conn *conn)
1324 {
1325         struct kib_rx *rx;
1326         struct page    *pg;
1327         int             pg_off;
1328         int             ipg;
1329         int             i;
1330
1331         for (pg_off = ipg = i = 0; i < IBLND_RX_MSGS(conn); i++) {
1332                 pg = conn->ibc_rx_pages->ibp_pages[ipg];
1333                 rx = &conn->ibc_rxs[i];
1334
1335                 rx->rx_conn = conn;
1336                 rx->rx_msg = (struct kib_msg *)(((char *)page_address(pg)) + pg_off);
1337
1338                 rx->rx_msgaddr =
1339                         kiblnd_dma_map_single(conn->ibc_hdev->ibh_ibdev,
1340                                               rx->rx_msg, IBLND_MSG_SIZE,
1341                                               DMA_FROM_DEVICE);
1342                 LASSERT(!kiblnd_dma_mapping_error(conn->ibc_hdev->ibh_ibdev,
1343                                                   rx->rx_msgaddr));
1344                 KIBLND_UNMAP_ADDR_SET(rx, rx_msgunmap, rx->rx_msgaddr);
1345
1346                 CDEBUG(D_NET, "rx %d: %p %#llx(%#llx)\n",
1347                        i, rx->rx_msg, rx->rx_msgaddr,
1348                        (__u64)(page_to_phys(pg) + pg_off));
1349
1350                 pg_off += IBLND_MSG_SIZE;
1351                 LASSERT(pg_off <= PAGE_SIZE);
1352
1353                 if (pg_off == PAGE_SIZE) {
1354                         pg_off = 0;
1355                         ipg++;
1356                         LASSERT(ipg <= IBLND_RX_MSG_PAGES(conn));
1357                 }
1358         }
1359 }
1360
1361 static void
1362 kiblnd_unmap_tx_pool(struct kib_tx_pool *tpo)
1363 {
1364         struct kib_hca_dev *hdev = tpo->tpo_hdev;
1365         struct kib_tx *tx;
1366         int i;
1367
1368         LASSERT (tpo->tpo_pool.po_allocated == 0);
1369
1370         if (hdev == NULL)
1371                 return;
1372
1373         for (i = 0; i < tpo->tpo_pool.po_size; i++) {
1374                 tx = &tpo->tpo_tx_descs[i];
1375                 kiblnd_dma_unmap_single(hdev->ibh_ibdev,
1376                                         KIBLND_UNMAP_ADDR(tx, tx_msgunmap,
1377                                                           tx->tx_msgaddr),
1378                                         IBLND_MSG_SIZE, DMA_TO_DEVICE);
1379         }
1380
1381         kiblnd_hdev_decref(hdev);
1382         tpo->tpo_hdev = NULL;
1383 }
1384
1385 static struct kib_hca_dev *
1386 kiblnd_current_hdev(struct kib_dev *dev)
1387 {
1388         struct kib_hca_dev *hdev;
1389         unsigned long  flags;
1390         int            i = 0;
1391
1392         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1393         while (dev->ibd_failover) {
1394                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1395                 if (i++ % 50 == 0)
1396                         CDEBUG(D_NET, "%s: Wait for failover\n",
1397                                dev->ibd_ifname);
1398                 set_current_state(TASK_INTERRUPTIBLE);
1399                 schedule_timeout(cfs_time_seconds(1) / 100);
1400
1401                 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1402         }
1403
1404         kiblnd_hdev_addref_locked(dev->ibd_hdev);
1405         hdev = dev->ibd_hdev;
1406
1407         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1408
1409         return hdev;
1410 }
1411
1412 static void
1413 kiblnd_map_tx_pool(struct kib_tx_pool *tpo)
1414 {
1415         struct kib_pages *txpgs = tpo->tpo_tx_pages;
1416         struct kib_pool *pool = &tpo->tpo_pool;
1417         struct kib_net      *net   = pool->po_owner->ps_net;
1418         struct kib_dev *dev;
1419         struct page *page;
1420         struct kib_tx *tx;
1421         int             page_offset;
1422         int             ipage;
1423         int             i;
1424
1425         LASSERT (net != NULL);
1426
1427         dev = net->ibn_dev;
1428
1429         /* pre-mapped messages are not bigger than 1 page */
1430         CLASSERT (IBLND_MSG_SIZE <= PAGE_SIZE);
1431
1432         /* No fancy arithmetic when we do the buffer calculations */
1433         CLASSERT (PAGE_SIZE % IBLND_MSG_SIZE == 0);
1434
1435         tpo->tpo_hdev = kiblnd_current_hdev(dev);
1436
1437         for (ipage = page_offset = i = 0; i < pool->po_size; i++) {
1438                 page = txpgs->ibp_pages[ipage];
1439                 tx = &tpo->tpo_tx_descs[i];
1440
1441                 tx->tx_msg = (struct kib_msg *)(((char *)page_address(page)) +
1442                                                 page_offset);
1443
1444                 tx->tx_msgaddr = kiblnd_dma_map_single(tpo->tpo_hdev->ibh_ibdev,
1445                                                        tx->tx_msg,
1446                                                        IBLND_MSG_SIZE,
1447                                                        DMA_TO_DEVICE);
1448                 LASSERT(!kiblnd_dma_mapping_error(tpo->tpo_hdev->ibh_ibdev,
1449                                                   tx->tx_msgaddr));
1450                 KIBLND_UNMAP_ADDR_SET(tx, tx_msgunmap, tx->tx_msgaddr);
1451
1452                 list_add(&tx->tx_list, &pool->po_free_list);
1453
1454                 page_offset += IBLND_MSG_SIZE;
1455                 LASSERT(page_offset <= PAGE_SIZE);
1456
1457                 if (page_offset == PAGE_SIZE) {
1458                         page_offset = 0;
1459                         ipage++;
1460                         LASSERT(ipage <= txpgs->ibp_npages);
1461                 }
1462         }
1463 }
1464
1465 static void
1466 kiblnd_destroy_fmr_pool(struct kib_fmr_pool *fpo)
1467 {
1468         LASSERT(fpo->fpo_map_count == 0);
1469
1470         if (fpo->fpo_is_fmr && fpo->fmr.fpo_fmr_pool) {
1471                 ib_destroy_fmr_pool(fpo->fmr.fpo_fmr_pool);
1472         } else {
1473                 struct kib_fast_reg_descriptor *frd, *tmp;
1474                 int i = 0;
1475
1476                 list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1477                                          frd_list) {
1478                         list_del(&frd->frd_list);
1479 #ifndef HAVE_IB_MAP_MR_SG
1480                         ib_free_fast_reg_page_list(frd->frd_frpl);
1481 #endif
1482                         ib_dereg_mr(frd->frd_mr);
1483                         LIBCFS_FREE(frd, sizeof(*frd));
1484                         i++;
1485                 }
1486                 if (i < fpo->fast_reg.fpo_pool_size)
1487                         CERROR("FastReg pool still has %d regions registered\n",
1488                                 fpo->fast_reg.fpo_pool_size - i);
1489         }
1490
1491         if (fpo->fpo_hdev)
1492                 kiblnd_hdev_decref(fpo->fpo_hdev);
1493
1494         LIBCFS_FREE(fpo, sizeof(*fpo));
1495 }
1496
1497 static void
1498 kiblnd_destroy_fmr_pool_list(struct list_head *head)
1499 {
1500         struct kib_fmr_pool *fpo, *tmp;
1501
1502         list_for_each_entry_safe(fpo, tmp, head, fpo_list) {
1503                 list_del(&fpo->fpo_list);
1504                 kiblnd_destroy_fmr_pool(fpo);
1505         }
1506 }
1507
1508 static int
1509 kiblnd_fmr_pool_size(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1510                      int ncpts)
1511 {
1512         int size = tunables->lnd_fmr_pool_size / ncpts;
1513
1514         return max(IBLND_FMR_POOL, size);
1515 }
1516
1517 static int
1518 kiblnd_fmr_flush_trigger(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1519                          int ncpts)
1520 {
1521         int size = tunables->lnd_fmr_flush_trigger / ncpts;
1522
1523         return max(IBLND_FMR_POOL_FLUSH, size);
1524 }
1525
1526 static int kiblnd_alloc_fmr_pool(struct kib_fmr_poolset *fps,
1527                                  struct kib_fmr_pool *fpo)
1528 {
1529         struct ib_fmr_pool_param param = {
1530                 .max_pages_per_fmr = LNET_MAX_IOV,
1531                 .page_shift        = PAGE_SHIFT,
1532                 .access            = (IB_ACCESS_LOCAL_WRITE |
1533                                       IB_ACCESS_REMOTE_WRITE),
1534                 .pool_size         = fps->fps_pool_size,
1535                 .dirty_watermark   = fps->fps_flush_trigger,
1536                 .flush_function    = NULL,
1537                 .flush_arg         = NULL,
1538                 .cache             = !!fps->fps_cache };
1539         int rc = 0;
1540
1541         fpo->fmr.fpo_fmr_pool = ib_create_fmr_pool(fpo->fpo_hdev->ibh_pd,
1542                                                    &param);
1543         if (IS_ERR(fpo->fmr.fpo_fmr_pool)) {
1544                 rc = PTR_ERR(fpo->fmr.fpo_fmr_pool);
1545                 if (rc != -ENOSYS)
1546                         CERROR("Failed to create FMR pool: %d\n", rc);
1547                 else
1548                         CERROR("FMRs are not supported\n");
1549         }
1550         fpo->fpo_is_fmr = true;
1551
1552         return rc;
1553 }
1554
1555 static int kiblnd_alloc_freg_pool(struct kib_fmr_poolset *fps,
1556                                   struct kib_fmr_pool *fpo,
1557                                   enum kib_dev_caps dev_caps)
1558 {
1559         struct kib_fast_reg_descriptor *frd, *tmp;
1560         int i, rc;
1561
1562         fpo->fpo_is_fmr = false;
1563
1564         INIT_LIST_HEAD(&fpo->fast_reg.fpo_pool_list);
1565         fpo->fast_reg.fpo_pool_size = 0;
1566         for (i = 0; i < fps->fps_pool_size; i++) {
1567                 LIBCFS_CPT_ALLOC(frd, lnet_cpt_table(), fps->fps_cpt,
1568                                  sizeof(*frd));
1569                 if (!frd) {
1570                         CERROR("Failed to allocate a new fast_reg descriptor\n");
1571                         rc = -ENOMEM;
1572                         goto out;
1573                 }
1574                 frd->frd_mr = NULL;
1575
1576 #ifndef HAVE_IB_MAP_MR_SG
1577                 frd->frd_frpl = ib_alloc_fast_reg_page_list(fpo->fpo_hdev->ibh_ibdev,
1578                                                             LNET_MAX_IOV);
1579                 if (IS_ERR(frd->frd_frpl)) {
1580                         rc = PTR_ERR(frd->frd_frpl);
1581                         CERROR("Failed to allocate ib_fast_reg_page_list: %d\n",
1582                                 rc);
1583                         frd->frd_frpl = NULL;
1584                         goto out_middle;
1585                 }
1586 #endif
1587
1588 #ifdef HAVE_IB_ALLOC_FAST_REG_MR
1589                 frd->frd_mr = ib_alloc_fast_reg_mr(fpo->fpo_hdev->ibh_pd,
1590                                                    LNET_MAX_IOV);
1591 #else
1592                 /*
1593                  * it is expected to get here if this is an MLX-5 card.
1594                  * MLX-4 cards will always use FMR and MLX-5 cards will
1595                  * always use fast_reg. It turns out that some MLX-5 cards
1596                  * (possibly due to older FW versions) do not natively support
1597                  * gaps. So we will need to track them here.
1598                  */
1599                 frd->frd_mr = ib_alloc_mr(fpo->fpo_hdev->ibh_pd,
1600 #ifdef IB_MR_TYPE_SG_GAPS
1601                                           ((*kiblnd_tunables.kib_use_fastreg_gaps == 1) &&
1602                                            (dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT)) ?
1603                                                 IB_MR_TYPE_SG_GAPS :
1604                                                 IB_MR_TYPE_MEM_REG,
1605 #else
1606                                                 IB_MR_TYPE_MEM_REG,
1607 #endif
1608                                           LNET_MAX_IOV);
1609                 if ((*kiblnd_tunables.kib_use_fastreg_gaps == 1) &&
1610                     (dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT))
1611                         CWARN("using IB_MR_TYPE_SG_GAPS, expect a performance drop\n");
1612 #endif
1613                 if (IS_ERR(frd->frd_mr)) {
1614                         rc = PTR_ERR(frd->frd_mr);
1615                         CERROR("Failed to allocate ib_fast_reg_mr: %d\n", rc);
1616                         frd->frd_mr = NULL;
1617                         goto out_middle;
1618                 }
1619
1620                 /* There appears to be a bug in MLX5 code where you must
1621                  * invalidate the rkey of a new FastReg pool before first
1622                  * using it. Thus, I am marking the FRD invalid here. */
1623                 frd->frd_valid = false;
1624
1625                 list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1626                 fpo->fast_reg.fpo_pool_size++;
1627         }
1628
1629         return 0;
1630
1631 out_middle:
1632         if (frd->frd_mr)
1633                 ib_dereg_mr(frd->frd_mr);
1634 #ifndef HAVE_IB_MAP_MR_SG
1635         if (frd->frd_frpl)
1636                 ib_free_fast_reg_page_list(frd->frd_frpl);
1637 #endif
1638         LIBCFS_FREE(frd, sizeof(*frd));
1639
1640 out:
1641         list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1642                                  frd_list) {
1643                 list_del(&frd->frd_list);
1644 #ifndef HAVE_IB_MAP_MR_SG
1645                 ib_free_fast_reg_page_list(frd->frd_frpl);
1646 #endif
1647                 ib_dereg_mr(frd->frd_mr);
1648                 LIBCFS_FREE(frd, sizeof(*frd));
1649         }
1650
1651         return rc;
1652 }
1653
1654 static int kiblnd_create_fmr_pool(struct kib_fmr_poolset *fps,
1655                                   struct kib_fmr_pool **pp_fpo)
1656 {
1657         struct kib_dev *dev = fps->fps_net->ibn_dev;
1658         struct kib_fmr_pool *fpo;
1659         int rc;
1660
1661         LIBCFS_CPT_ALLOC(fpo, lnet_cpt_table(), fps->fps_cpt, sizeof(*fpo));
1662         if (!fpo) {
1663                 return -ENOMEM;
1664         }
1665         memset(fpo, 0, sizeof(*fpo));
1666
1667         fpo->fpo_hdev = kiblnd_current_hdev(dev);
1668
1669         if (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)
1670                 rc = kiblnd_alloc_fmr_pool(fps, fpo);
1671         else
1672                 rc = kiblnd_alloc_freg_pool(fps, fpo, dev->ibd_dev_caps);
1673         if (rc)
1674                 goto out_fpo;
1675
1676         fpo->fpo_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
1677         fpo->fpo_owner = fps;
1678         *pp_fpo = fpo;
1679
1680         return 0;
1681
1682 out_fpo:
1683         kiblnd_hdev_decref(fpo->fpo_hdev);
1684         LIBCFS_FREE(fpo, sizeof(*fpo));
1685         return rc;
1686 }
1687
1688 static void
1689 kiblnd_fail_fmr_poolset(struct kib_fmr_poolset *fps, struct list_head *zombies)
1690 {
1691         if (fps->fps_net == NULL) /* intialized? */
1692                 return;
1693
1694         spin_lock(&fps->fps_lock);
1695
1696         while (!list_empty(&fps->fps_pool_list)) {
1697                 struct kib_fmr_pool *fpo = list_entry(fps->fps_pool_list.next,
1698                                                       struct kib_fmr_pool,
1699                                                       fpo_list);
1700
1701                 fpo->fpo_failed = 1;
1702                 list_del(&fpo->fpo_list);
1703                 if (fpo->fpo_map_count == 0)
1704                         list_add(&fpo->fpo_list, zombies);
1705                 else
1706                         list_add(&fpo->fpo_list, &fps->fps_failed_pool_list);
1707         }
1708
1709         spin_unlock(&fps->fps_lock);
1710 }
1711
1712 static void
1713 kiblnd_fini_fmr_poolset(struct kib_fmr_poolset *fps)
1714 {
1715         if (fps->fps_net != NULL) { /* initialized? */
1716                 kiblnd_destroy_fmr_pool_list(&fps->fps_failed_pool_list);
1717                 kiblnd_destroy_fmr_pool_list(&fps->fps_pool_list);
1718         }
1719 }
1720
1721 static int
1722 kiblnd_init_fmr_poolset(struct kib_fmr_poolset *fps, int cpt, int ncpts,
1723                         struct kib_net *net,
1724                         struct lnet_ioctl_config_o2iblnd_tunables *tunables)
1725 {
1726         struct kib_fmr_pool *fpo;
1727         int rc;
1728
1729         memset(fps, 0, sizeof(struct kib_fmr_poolset));
1730
1731         fps->fps_net = net;
1732         fps->fps_cpt = cpt;
1733
1734         fps->fps_pool_size = kiblnd_fmr_pool_size(tunables, ncpts);
1735         fps->fps_flush_trigger = kiblnd_fmr_flush_trigger(tunables, ncpts);
1736         fps->fps_cache = tunables->lnd_fmr_cache;
1737
1738         spin_lock_init(&fps->fps_lock);
1739         INIT_LIST_HEAD(&fps->fps_pool_list);
1740         INIT_LIST_HEAD(&fps->fps_failed_pool_list);
1741
1742         rc = kiblnd_create_fmr_pool(fps, &fpo);
1743         if (rc == 0)
1744                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1745
1746         return rc;
1747 }
1748
1749 static int
1750 kiblnd_fmr_pool_is_idle(struct kib_fmr_pool *fpo, time64_t now)
1751 {
1752         if (fpo->fpo_map_count != 0) /* still in use */
1753                 return 0;
1754         if (fpo->fpo_failed)
1755                 return 1;
1756         return now >= fpo->fpo_deadline;
1757 }
1758
1759 static int
1760 kiblnd_map_tx_pages(struct kib_tx *tx, struct kib_rdma_desc *rd)
1761 {
1762         struct kib_hca_dev *hdev;
1763         __u64           *pages = tx->tx_pages;
1764         int             npages;
1765         int             size;
1766         int             i;
1767
1768         hdev = tx->tx_pool->tpo_hdev;
1769
1770         for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
1771                 for (size = 0; size <  rd->rd_frags[i].rf_nob;
1772                         size += hdev->ibh_page_size) {
1773                         pages[npages++] = (rd->rd_frags[i].rf_addr &
1774                                            hdev->ibh_page_mask) + size;
1775                 }
1776         }
1777
1778         return npages;
1779 }
1780
1781 void
1782 kiblnd_fmr_pool_unmap(struct kib_fmr *fmr, int status)
1783 {
1784         struct list_head zombies = LIST_HEAD_INIT(zombies);
1785         struct kib_fmr_pool *fpo = fmr->fmr_pool;
1786         struct kib_fmr_poolset *fps;
1787         time64_t now = ktime_get_seconds();
1788         struct kib_fmr_pool *tmp;
1789         int rc;
1790
1791         if (!fpo)
1792                 return;
1793
1794         fps = fpo->fpo_owner;
1795         if (fpo->fpo_is_fmr) {
1796                 if (fmr->fmr_pfmr) {
1797                         ib_fmr_pool_unmap(fmr->fmr_pfmr);
1798                         fmr->fmr_pfmr = NULL;
1799                 }
1800
1801                 if (status) {
1802                         rc = ib_flush_fmr_pool(fpo->fmr.fpo_fmr_pool);
1803                         LASSERT(!rc);
1804                 }
1805         } else {
1806                 struct kib_fast_reg_descriptor *frd = fmr->fmr_frd;
1807
1808                 if (frd) {
1809                         frd->frd_valid = false;
1810                         spin_lock(&fps->fps_lock);
1811                         list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1812                         spin_unlock(&fps->fps_lock);
1813                         fmr->fmr_frd = NULL;
1814                 }
1815         }
1816         fmr->fmr_pool = NULL;
1817
1818         spin_lock(&fps->fps_lock);
1819         fpo->fpo_map_count--;   /* decref the pool */
1820
1821         list_for_each_entry_safe(fpo, tmp, &fps->fps_pool_list, fpo_list) {
1822                 /* the first pool is persistent */
1823                 if (fps->fps_pool_list.next == &fpo->fpo_list)
1824                         continue;
1825
1826                 if (kiblnd_fmr_pool_is_idle(fpo, now)) {
1827                         list_move(&fpo->fpo_list, &zombies);
1828                         fps->fps_version++;
1829                 }
1830         }
1831         spin_unlock(&fps->fps_lock);
1832
1833         if (!list_empty(&zombies))
1834                 kiblnd_destroy_fmr_pool_list(&zombies);
1835 }
1836
1837 int kiblnd_fmr_pool_map(struct kib_fmr_poolset *fps, struct kib_tx *tx,
1838                         struct kib_rdma_desc *rd, u32 nob, u64 iov,
1839                         struct kib_fmr *fmr)
1840 {
1841         struct kib_fmr_pool *fpo;
1842         __u64 *pages = tx->tx_pages;
1843         __u64 version;
1844         bool is_rx = (rd != tx->tx_rd);
1845         bool tx_pages_mapped = 0;
1846         int npages = 0;
1847         int rc;
1848
1849 again:
1850         spin_lock(&fps->fps_lock);
1851         version = fps->fps_version;
1852         list_for_each_entry(fpo, &fps->fps_pool_list, fpo_list) {
1853                 fpo->fpo_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
1854                 fpo->fpo_map_count++;
1855
1856                 if (fpo->fpo_is_fmr) {
1857                         struct ib_pool_fmr *pfmr;
1858
1859                         spin_unlock(&fps->fps_lock);
1860
1861                         if (!tx_pages_mapped) {
1862                                 npages = kiblnd_map_tx_pages(tx, rd);
1863                                 tx_pages_mapped = 1;
1864                         }
1865
1866                         pfmr = kib_fmr_pool_map(fpo->fmr.fpo_fmr_pool,
1867                                                 pages, npages, iov);
1868                         if (likely(!IS_ERR(pfmr))) {
1869                                 fmr->fmr_key  = is_rx ? pfmr->fmr->rkey
1870                                                       : pfmr->fmr->lkey;
1871                                 fmr->fmr_frd  = NULL;
1872                                 fmr->fmr_pfmr = pfmr;
1873                                 fmr->fmr_pool = fpo;
1874                                 return 0;
1875                         }
1876                         rc = PTR_ERR(pfmr);
1877                 } else {
1878                         if (!list_empty(&fpo->fast_reg.fpo_pool_list)) {
1879                                 struct kib_fast_reg_descriptor *frd;
1880 #ifdef HAVE_IB_MAP_MR_SG
1881                                 struct ib_reg_wr *wr;
1882                                 int n;
1883 #else
1884                                 struct ib_rdma_wr *wr;
1885                                 struct ib_fast_reg_page_list *frpl;
1886 #endif
1887                                 struct ib_mr *mr;
1888
1889                                 frd = list_first_entry(&fpo->fast_reg.fpo_pool_list,
1890                                                         struct kib_fast_reg_descriptor,
1891                                                         frd_list);
1892                                 list_del(&frd->frd_list);
1893                                 spin_unlock(&fps->fps_lock);
1894
1895 #ifndef HAVE_IB_MAP_MR_SG
1896                                 frpl = frd->frd_frpl;
1897 #endif
1898                                 mr   = frd->frd_mr;
1899
1900                                 if (!frd->frd_valid) {
1901                                         struct ib_rdma_wr *inv_wr;
1902                                         __u32 key = is_rx ? mr->rkey : mr->lkey;
1903
1904                                         inv_wr = &frd->frd_inv_wr;
1905                                         memset(inv_wr, 0, sizeof(*inv_wr));
1906
1907                                         inv_wr->wr.opcode = IB_WR_LOCAL_INV;
1908                                         inv_wr->wr.wr_id  = IBLND_WID_MR;
1909                                         inv_wr->wr.ex.invalidate_rkey = key;
1910
1911                                         /* Bump the key */
1912                                         key = ib_inc_rkey(key);
1913                                         ib_update_fast_reg_key(mr, key);
1914                                 }
1915
1916 #ifdef HAVE_IB_MAP_MR_SG
1917 #ifdef HAVE_IB_MAP_MR_SG_5ARGS
1918                                 n = ib_map_mr_sg(mr, tx->tx_frags,
1919                                                  tx->tx_nfrags, NULL, PAGE_SIZE);
1920 #else
1921                                 n = ib_map_mr_sg(mr, tx->tx_frags,
1922                                                  tx->tx_nfrags, PAGE_SIZE);
1923 #endif
1924                                 if (unlikely(n != tx->tx_nfrags)) {
1925                                         CERROR("Failed to map mr %d/%d "
1926                                                "elements\n", n, tx->tx_nfrags);
1927                                         return n < 0 ? n : -EINVAL;
1928                                 }
1929
1930                                 wr = &frd->frd_fastreg_wr;
1931                                 memset(wr, 0, sizeof(*wr));
1932
1933                                 wr->wr.opcode = IB_WR_REG_MR;
1934                                 wr->wr.wr_id  = IBLND_WID_MR;
1935                                 wr->wr.num_sge = 0;
1936                                 wr->wr.send_flags = 0;
1937                                 wr->mr = mr;
1938                                 wr->key = is_rx ? mr->rkey : mr->lkey;
1939                                 wr->access = (IB_ACCESS_LOCAL_WRITE |
1940                                               IB_ACCESS_REMOTE_WRITE);
1941 #else
1942                                 if (!tx_pages_mapped) {
1943                                         npages = kiblnd_map_tx_pages(tx, rd);
1944                                         tx_pages_mapped = 1;
1945                                 }
1946
1947                                 LASSERT(npages <= frpl->max_page_list_len);
1948                                 memcpy(frpl->page_list, pages,
1949                                         sizeof(*pages) * npages);
1950
1951                                 /* Prepare FastReg WR */
1952                                 wr = &frd->frd_fastreg_wr;
1953                                 memset(wr, 0, sizeof(*wr));
1954
1955                                 wr->wr.opcode = IB_WR_FAST_REG_MR;
1956                                 wr->wr.wr_id  = IBLND_WID_MR;
1957
1958                                 wr->wr.wr.fast_reg.iova_start = iov;
1959                                 wr->wr.wr.fast_reg.page_list  = frpl;
1960                                 wr->wr.wr.fast_reg.page_list_len = npages;
1961                                 wr->wr.wr.fast_reg.page_shift = PAGE_SHIFT;
1962                                 wr->wr.wr.fast_reg.length = nob;
1963                                 wr->wr.wr.fast_reg.rkey =
1964                                                 is_rx ? mr->rkey : mr->lkey;
1965                                 wr->wr.wr.fast_reg.access_flags =
1966                                                 (IB_ACCESS_LOCAL_WRITE |
1967                                                  IB_ACCESS_REMOTE_WRITE);
1968 #endif
1969
1970                                 fmr->fmr_key  = is_rx ? mr->rkey : mr->lkey;
1971                                 fmr->fmr_frd  = frd;
1972                                 fmr->fmr_pfmr = NULL;
1973                                 fmr->fmr_pool = fpo;
1974                                 return 0;
1975                         }
1976                         spin_unlock(&fps->fps_lock);
1977                         rc = -EAGAIN;
1978                 }
1979
1980                 spin_lock(&fps->fps_lock);
1981                 fpo->fpo_map_count--;
1982                 if (rc != -EAGAIN) {
1983                         spin_unlock(&fps->fps_lock);
1984                         return rc;
1985                 }
1986
1987                 /* EAGAIN and ... */
1988                 if (version != fps->fps_version) {
1989                         spin_unlock(&fps->fps_lock);
1990                         goto again;
1991                 }
1992         }
1993
1994         if (fps->fps_increasing) {
1995                 spin_unlock(&fps->fps_lock);
1996                 CDEBUG(D_NET, "Another thread is allocating new "
1997                        "FMR pool, waiting for her to complete\n");
1998                 schedule();
1999                 goto again;
2000
2001         }
2002
2003         if (ktime_get_seconds() < fps->fps_next_retry) {
2004                 /* someone failed recently */
2005                 spin_unlock(&fps->fps_lock);
2006                 return -EAGAIN;
2007         }
2008
2009         fps->fps_increasing = 1;
2010         spin_unlock(&fps->fps_lock);
2011
2012         CDEBUG(D_NET, "Allocate new FMR pool\n");
2013         rc = kiblnd_create_fmr_pool(fps, &fpo);
2014         spin_lock(&fps->fps_lock);
2015         fps->fps_increasing = 0;
2016         if (rc == 0) {
2017                 fps->fps_version++;
2018                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
2019         } else {
2020                 fps->fps_next_retry = ktime_get_seconds() + IBLND_POOL_RETRY;
2021         }
2022         spin_unlock(&fps->fps_lock);
2023
2024         goto again;
2025 }
2026
2027 static void
2028 kiblnd_fini_pool(struct kib_pool *pool)
2029 {
2030         LASSERT(list_empty(&pool->po_free_list));
2031         LASSERT(pool->po_allocated == 0);
2032
2033         CDEBUG(D_NET, "Finalize %s pool\n", pool->po_owner->ps_name);
2034 }
2035
2036 static void
2037 kiblnd_init_pool(struct kib_poolset *ps, struct kib_pool *pool, int size)
2038 {
2039         CDEBUG(D_NET, "Initialize %s pool\n", ps->ps_name);
2040
2041         memset(pool, 0, sizeof(struct kib_pool));
2042         INIT_LIST_HEAD(&pool->po_free_list);
2043         pool->po_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
2044         pool->po_owner = ps;
2045         pool->po_size = size;
2046 }
2047
2048 static void
2049 kiblnd_destroy_pool_list(struct list_head *head)
2050 {
2051         struct kib_pool *pool;
2052
2053         while (!list_empty(head)) {
2054                 pool = list_entry(head->next, struct kib_pool, po_list);
2055                 list_del(&pool->po_list);
2056
2057                 LASSERT(pool->po_owner != NULL);
2058                 pool->po_owner->ps_pool_destroy(pool);
2059         }
2060 }
2061
2062 static void
2063 kiblnd_fail_poolset(struct kib_poolset *ps, struct list_head *zombies)
2064 {
2065         if (ps->ps_net == NULL) /* intialized? */
2066                 return;
2067
2068         spin_lock(&ps->ps_lock);
2069         while (!list_empty(&ps->ps_pool_list)) {
2070                 struct kib_pool *po = list_entry(ps->ps_pool_list.next,
2071                                                  struct kib_pool, po_list);
2072
2073                 po->po_failed = 1;
2074                 list_del(&po->po_list);
2075                 if (po->po_allocated == 0)
2076                         list_add(&po->po_list, zombies);
2077                 else
2078                         list_add(&po->po_list, &ps->ps_failed_pool_list);
2079         }
2080         spin_unlock(&ps->ps_lock);
2081 }
2082
2083 static void
2084 kiblnd_fini_poolset(struct kib_poolset *ps)
2085 {
2086         if (ps->ps_net != NULL) { /* initialized? */
2087                 kiblnd_destroy_pool_list(&ps->ps_failed_pool_list);
2088                 kiblnd_destroy_pool_list(&ps->ps_pool_list);
2089         }
2090 }
2091
2092 static int
2093 kiblnd_init_poolset(struct kib_poolset *ps, int cpt,
2094                     struct kib_net *net, char *name, int size,
2095                     kib_ps_pool_create_t po_create,
2096                     kib_ps_pool_destroy_t po_destroy,
2097                     kib_ps_node_init_t nd_init,
2098                     kib_ps_node_fini_t nd_fini)
2099 {
2100         struct kib_pool *pool;
2101         int rc;
2102
2103         memset(ps, 0, sizeof(struct kib_poolset));
2104
2105         ps->ps_cpt          = cpt;
2106         ps->ps_net          = net;
2107         ps->ps_pool_create  = po_create;
2108         ps->ps_pool_destroy = po_destroy;
2109         ps->ps_node_init    = nd_init;
2110         ps->ps_node_fini    = nd_fini;
2111         ps->ps_pool_size    = size;
2112         if (strlcpy(ps->ps_name, name, sizeof(ps->ps_name))
2113             >= sizeof(ps->ps_name))
2114                 return -E2BIG;
2115         spin_lock_init(&ps->ps_lock);
2116         INIT_LIST_HEAD(&ps->ps_pool_list);
2117         INIT_LIST_HEAD(&ps->ps_failed_pool_list);
2118
2119         rc = ps->ps_pool_create(ps, size, &pool);
2120         if (rc == 0)
2121                 list_add(&pool->po_list, &ps->ps_pool_list);
2122         else
2123                 CERROR("Failed to create the first pool for %s\n", ps->ps_name);
2124
2125         return rc;
2126 }
2127
2128 static int
2129 kiblnd_pool_is_idle(struct kib_pool *pool, time64_t now)
2130 {
2131         if (pool->po_allocated != 0) /* still in use */
2132                 return 0;
2133         if (pool->po_failed)
2134                 return 1;
2135         return now >= pool->po_deadline;
2136 }
2137
2138 void
2139 kiblnd_pool_free_node(struct kib_pool *pool, struct list_head *node)
2140 {
2141         struct list_head zombies = LIST_HEAD_INIT(zombies);
2142         struct kib_poolset *ps = pool->po_owner;
2143         struct kib_pool *tmp;
2144         time64_t now = ktime_get_seconds();
2145
2146         spin_lock(&ps->ps_lock);
2147
2148         if (ps->ps_node_fini != NULL)
2149                 ps->ps_node_fini(pool, node);
2150
2151         LASSERT(pool->po_allocated > 0);
2152         list_add(node, &pool->po_free_list);
2153         pool->po_allocated--;
2154
2155         list_for_each_entry_safe(pool, tmp, &ps->ps_pool_list, po_list) {
2156                 /* the first pool is persistent */
2157                 if (ps->ps_pool_list.next == &pool->po_list)
2158                         continue;
2159
2160                 if (kiblnd_pool_is_idle(pool, now))
2161                         list_move(&pool->po_list, &zombies);
2162         }
2163         spin_unlock(&ps->ps_lock);
2164
2165         if (!list_empty(&zombies))
2166                 kiblnd_destroy_pool_list(&zombies);
2167 }
2168
2169 struct list_head *
2170 kiblnd_pool_alloc_node(struct kib_poolset *ps)
2171 {
2172         struct list_head        *node;
2173         struct kib_pool *pool;
2174         int                     rc;
2175         unsigned int            interval = 1;
2176         ktime_t time_before;
2177         unsigned int trips = 0;
2178
2179 again:
2180         spin_lock(&ps->ps_lock);
2181         list_for_each_entry(pool, &ps->ps_pool_list, po_list) {
2182                 if (list_empty(&pool->po_free_list))
2183                         continue;
2184
2185                 pool->po_allocated++;
2186                 pool->po_deadline = ktime_get_seconds() +
2187                                     IBLND_POOL_DEADLINE;
2188                 node = pool->po_free_list.next;
2189                 list_del(node);
2190
2191                 if (ps->ps_node_init != NULL) {
2192                         /* still hold the lock */
2193                         ps->ps_node_init(pool, node);
2194                 }
2195                 spin_unlock(&ps->ps_lock);
2196                 return node;
2197         }
2198
2199         /* no available tx pool and ... */
2200         if (ps->ps_increasing) {
2201                 /* another thread is allocating a new pool */
2202                 spin_unlock(&ps->ps_lock);
2203                 trips++;
2204                 CDEBUG(D_NET, "Another thread is allocating new "
2205                        "%s pool, waiting %d HZs for her to complete."
2206                        "trips = %d\n",
2207                        ps->ps_name, interval, trips);
2208
2209                 set_current_state(TASK_INTERRUPTIBLE);
2210                 schedule_timeout(interval);
2211                 if (interval < cfs_time_seconds(1))
2212                         interval *= 2;
2213
2214                 goto again;
2215         }
2216
2217         if (ktime_get_seconds() < ps->ps_next_retry) {
2218                 /* someone failed recently */
2219                 spin_unlock(&ps->ps_lock);
2220                 return NULL;
2221         }
2222
2223         ps->ps_increasing = 1;
2224         spin_unlock(&ps->ps_lock);
2225
2226         CDEBUG(D_NET, "%s pool exhausted, allocate new pool\n", ps->ps_name);
2227         time_before = ktime_get();
2228         rc = ps->ps_pool_create(ps, ps->ps_pool_size, &pool);
2229         CDEBUG(D_NET, "ps_pool_create took %lld ms to complete",
2230                ktime_ms_delta(ktime_get(), time_before));
2231
2232         spin_lock(&ps->ps_lock);
2233         ps->ps_increasing = 0;
2234         if (rc == 0) {
2235                 list_add_tail(&pool->po_list, &ps->ps_pool_list);
2236         } else {
2237                 ps->ps_next_retry = ktime_get_seconds() + IBLND_POOL_RETRY;
2238                 CERROR("Can't allocate new %s pool because out of memory\n",
2239                        ps->ps_name);
2240         }
2241         spin_unlock(&ps->ps_lock);
2242
2243         goto again;
2244 }
2245
2246 static void
2247 kiblnd_destroy_tx_pool(struct kib_pool *pool)
2248 {
2249         struct kib_tx_pool *tpo = container_of(pool, struct kib_tx_pool,
2250                                                tpo_pool);
2251         int i;
2252
2253         LASSERT (pool->po_allocated == 0);
2254
2255         if (tpo->tpo_tx_pages != NULL) {
2256                 kiblnd_unmap_tx_pool(tpo);
2257                 kiblnd_free_pages(tpo->tpo_tx_pages);
2258         }
2259
2260         if (tpo->tpo_tx_descs == NULL)
2261                 goto out;
2262
2263         for (i = 0; i < pool->po_size; i++) {
2264                 struct kib_tx *tx = &tpo->tpo_tx_descs[i];
2265                 int       wrq_sge = *kiblnd_tunables.kib_wrq_sge;
2266
2267                 list_del(&tx->tx_list);
2268                 if (tx->tx_pages != NULL)
2269                         LIBCFS_FREE(tx->tx_pages,
2270                                     LNET_MAX_IOV *
2271                                     sizeof(*tx->tx_pages));
2272                 if (tx->tx_frags != NULL)
2273                         LIBCFS_FREE(tx->tx_frags,
2274                                     (1 + IBLND_MAX_RDMA_FRAGS) *
2275                                     sizeof(*tx->tx_frags));
2276                 if (tx->tx_wrq != NULL)
2277                         LIBCFS_FREE(tx->tx_wrq,
2278                                     (1 + IBLND_MAX_RDMA_FRAGS) *
2279                                     sizeof(*tx->tx_wrq));
2280                 if (tx->tx_sge != NULL)
2281                         LIBCFS_FREE(tx->tx_sge,
2282                                     (1 + IBLND_MAX_RDMA_FRAGS) * wrq_sge *
2283                                     sizeof(*tx->tx_sge));
2284                 if (tx->tx_rd != NULL)
2285                         LIBCFS_FREE(tx->tx_rd,
2286                                     offsetof(struct kib_rdma_desc,
2287                                              rd_frags[IBLND_MAX_RDMA_FRAGS]));
2288         }
2289
2290         LIBCFS_FREE(tpo->tpo_tx_descs,
2291                     pool->po_size * sizeof(struct kib_tx));
2292 out:
2293         kiblnd_fini_pool(pool);
2294         LIBCFS_FREE(tpo, sizeof(struct kib_tx_pool));
2295 }
2296
2297 static int kiblnd_tx_pool_size(struct lnet_ni *ni, int ncpts)
2298 {
2299         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2300         int ntx;
2301
2302         tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2303         ntx = tunables->lnd_ntx / ncpts;
2304
2305         return max(IBLND_TX_POOL, ntx);
2306 }
2307
2308 static int
2309 kiblnd_create_tx_pool(struct kib_poolset *ps, int size, struct kib_pool **pp_po)
2310 {
2311         int            i;
2312         int            npg;
2313         struct kib_pool *pool;
2314         struct kib_tx_pool *tpo;
2315
2316         LIBCFS_CPT_ALLOC(tpo, lnet_cpt_table(), ps->ps_cpt, sizeof(*tpo));
2317         if (tpo == NULL) {
2318                 CERROR("Failed to allocate TX pool\n");
2319                 return -ENOMEM;
2320         }
2321
2322         pool = &tpo->tpo_pool;
2323         kiblnd_init_pool(ps, pool, size);
2324         tpo->tpo_tx_descs = NULL;
2325         tpo->tpo_tx_pages = NULL;
2326
2327         npg = (size * IBLND_MSG_SIZE + PAGE_SIZE - 1) / PAGE_SIZE;
2328         if (kiblnd_alloc_pages(&tpo->tpo_tx_pages, ps->ps_cpt, npg) != 0) {
2329                 CERROR("Can't allocate tx pages: %d\n", npg);
2330                 LIBCFS_FREE(tpo, sizeof(struct kib_tx_pool));
2331                 return -ENOMEM;
2332         }
2333
2334         LIBCFS_CPT_ALLOC(tpo->tpo_tx_descs, lnet_cpt_table(), ps->ps_cpt,
2335                          size * sizeof(struct kib_tx));
2336         if (tpo->tpo_tx_descs == NULL) {
2337                 CERROR("Can't allocate %d tx descriptors\n", size);
2338                 ps->ps_pool_destroy(pool);
2339                 return -ENOMEM;
2340         }
2341
2342         memset(tpo->tpo_tx_descs, 0, size * sizeof(struct kib_tx));
2343
2344         for (i = 0; i < size; i++) {
2345                 struct kib_tx *tx = &tpo->tpo_tx_descs[i];
2346                 int       wrq_sge = *kiblnd_tunables.kib_wrq_sge;
2347
2348                 tx->tx_pool = tpo;
2349                 if (ps->ps_net->ibn_fmr_ps != NULL) {
2350                         LIBCFS_CPT_ALLOC(tx->tx_pages,
2351                                          lnet_cpt_table(), ps->ps_cpt,
2352                                          LNET_MAX_IOV * sizeof(*tx->tx_pages));
2353                         if (tx->tx_pages == NULL)
2354                                 break;
2355                 }
2356
2357                 LIBCFS_CPT_ALLOC(tx->tx_frags, lnet_cpt_table(), ps->ps_cpt,
2358                                  (1 + IBLND_MAX_RDMA_FRAGS) *
2359                                  sizeof(*tx->tx_frags));
2360                 if (tx->tx_frags == NULL)
2361                         break;
2362
2363                 sg_init_table(tx->tx_frags, IBLND_MAX_RDMA_FRAGS + 1);
2364
2365                 LIBCFS_CPT_ALLOC(tx->tx_wrq, lnet_cpt_table(), ps->ps_cpt,
2366                                  (1 + IBLND_MAX_RDMA_FRAGS) *
2367                                  sizeof(*tx->tx_wrq));
2368                 if (tx->tx_wrq == NULL)
2369                         break;
2370
2371                 LIBCFS_CPT_ALLOC(tx->tx_sge, lnet_cpt_table(), ps->ps_cpt,
2372                                  (1 + IBLND_MAX_RDMA_FRAGS) * wrq_sge *
2373                                  sizeof(*tx->tx_sge));
2374                 if (tx->tx_sge == NULL)
2375                         break;
2376
2377                 LIBCFS_CPT_ALLOC(tx->tx_rd, lnet_cpt_table(), ps->ps_cpt,
2378                                  offsetof(struct kib_rdma_desc,
2379                                           rd_frags[IBLND_MAX_RDMA_FRAGS]));
2380                 if (tx->tx_rd == NULL)
2381                         break;
2382         }
2383
2384         if (i == size) {
2385                 kiblnd_map_tx_pool(tpo);
2386                 *pp_po = pool;
2387                 return 0;
2388         }
2389
2390         ps->ps_pool_destroy(pool);
2391         return -ENOMEM;
2392 }
2393
2394 static void
2395 kiblnd_tx_init(struct kib_pool *pool, struct list_head *node)
2396 {
2397         struct kib_tx_poolset *tps = container_of(pool->po_owner,
2398                                                   struct kib_tx_poolset,
2399                                                   tps_poolset);
2400         struct kib_tx *tx  = list_entry(node, struct kib_tx, tx_list);
2401
2402         tx->tx_cookie = tps->tps_next_tx_cookie++;
2403 }
2404
2405 static void
2406 kiblnd_net_fini_pools(struct kib_net *net)
2407 {
2408         int     i;
2409
2410         cfs_cpt_for_each(i, lnet_cpt_table()) {
2411                 struct kib_tx_poolset *tps;
2412                 struct kib_fmr_poolset *fps;
2413
2414                 if (net->ibn_tx_ps != NULL) {
2415                         tps = net->ibn_tx_ps[i];
2416                         kiblnd_fini_poolset(&tps->tps_poolset);
2417                 }
2418
2419                 if (net->ibn_fmr_ps != NULL) {
2420                         fps = net->ibn_fmr_ps[i];
2421                         kiblnd_fini_fmr_poolset(fps);
2422                 }
2423         }
2424
2425         if (net->ibn_tx_ps != NULL) {
2426                 cfs_percpt_free(net->ibn_tx_ps);
2427                 net->ibn_tx_ps = NULL;
2428         }
2429
2430         if (net->ibn_fmr_ps != NULL) {
2431                 cfs_percpt_free(net->ibn_fmr_ps);
2432                 net->ibn_fmr_ps = NULL;
2433         }
2434 }
2435
2436 static int
2437 kiblnd_net_init_pools(struct kib_net *net, struct lnet_ni *ni, __u32 *cpts,
2438                       int ncpts)
2439 {
2440         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2441 #ifdef HAVE_IB_GET_DMA_MR
2442         unsigned long   flags;
2443 #endif
2444         int             cpt;
2445         int             rc;
2446         int             i;
2447
2448         tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2449
2450 #ifdef HAVE_IB_GET_DMA_MR
2451         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2452         /*
2453          * if lnd_map_on_demand is zero then we have effectively disabled
2454          * FMR or FastReg and we're using global memory regions
2455          * exclusively.
2456          */
2457         if (!tunables->lnd_map_on_demand) {
2458                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2459                                            flags);
2460                 goto create_tx_pool;
2461         }
2462
2463         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2464 #endif
2465
2466         if (tunables->lnd_fmr_pool_size < tunables->lnd_ntx / 4) {
2467                 CERROR("Can't set fmr pool size (%d) < ntx / 4(%d)\n",
2468                        tunables->lnd_fmr_pool_size,
2469                        tunables->lnd_ntx / 4);
2470                 rc = -EINVAL;
2471                 goto failed;
2472         }
2473
2474         /* TX pool must be created later than FMR, see LU-2268
2475          * for details */
2476         LASSERT(net->ibn_tx_ps == NULL);
2477
2478         /* premapping can fail if ibd_nmr > 1, so we always create
2479          * FMR pool and map-on-demand if premapping failed */
2480
2481         net->ibn_fmr_ps = cfs_percpt_alloc(lnet_cpt_table(),
2482                                            sizeof(struct kib_fmr_poolset));
2483         if (net->ibn_fmr_ps == NULL) {
2484                 CERROR("Failed to allocate FMR pool array\n");
2485                 rc = -ENOMEM;
2486                 goto failed;
2487         }
2488
2489         for (i = 0; i < ncpts; i++) {
2490                 cpt = (cpts == NULL) ? i : cpts[i];
2491                 rc = kiblnd_init_fmr_poolset(net->ibn_fmr_ps[cpt], cpt, ncpts,
2492                                              net, tunables);
2493                 if (rc != 0) {
2494                         CERROR("Can't initialize FMR pool for CPT %d: %d\n",
2495                                cpt, rc);
2496                         goto failed;
2497                 }
2498         }
2499
2500         if (i > 0)
2501                 LASSERT(i == ncpts);
2502
2503 #ifdef HAVE_IB_GET_DMA_MR
2504  create_tx_pool:
2505 #endif
2506         net->ibn_tx_ps = cfs_percpt_alloc(lnet_cpt_table(),
2507                                           sizeof(struct kib_tx_poolset));
2508         if (net->ibn_tx_ps == NULL) {
2509                 CERROR("Failed to allocate tx pool array\n");
2510                 rc = -ENOMEM;
2511                 goto failed;
2512         }
2513
2514         for (i = 0; i < ncpts; i++) {
2515                 cpt = (cpts == NULL) ? i : cpts[i];
2516                 rc = kiblnd_init_poolset(&net->ibn_tx_ps[cpt]->tps_poolset,
2517                                          cpt, net, "TX",
2518                                          kiblnd_tx_pool_size(ni, ncpts),
2519                                          kiblnd_create_tx_pool,
2520                                          kiblnd_destroy_tx_pool,
2521                                          kiblnd_tx_init, NULL);
2522                 if (rc != 0) {
2523                         CERROR("Can't initialize TX pool for CPT %d: %d\n",
2524                                cpt, rc);
2525                         goto failed;
2526                 }
2527         }
2528
2529         return 0;
2530  failed:
2531         kiblnd_net_fini_pools(net);
2532         LASSERT(rc != 0);
2533         return rc;
2534 }
2535
2536 static int
2537 kiblnd_hdev_get_attr(struct kib_hca_dev *hdev)
2538 {
2539         struct ib_device_attr *dev_attr;
2540         int rc = 0;
2541
2542         /* It's safe to assume a HCA can handle a page size
2543          * matching that of the native system */
2544         hdev->ibh_page_shift = PAGE_SHIFT;
2545         hdev->ibh_page_size  = 1 << PAGE_SHIFT;
2546         hdev->ibh_page_mask  = ~((__u64)hdev->ibh_page_size - 1);
2547
2548 #ifndef HAVE_IB_DEVICE_ATTRS
2549         LIBCFS_ALLOC(dev_attr, sizeof(*dev_attr));
2550         if (dev_attr == NULL) {
2551                 CERROR("Out of memory\n");
2552                 return -ENOMEM;
2553         }
2554
2555         rc = ib_query_device(hdev->ibh_ibdev, dev_attr);
2556         if (rc != 0) {
2557                 CERROR("Failed to query IB device: %d\n", rc);
2558                 goto out_clean_attr;
2559         }
2560 #else
2561         dev_attr = &hdev->ibh_ibdev->attrs;
2562 #endif
2563
2564         hdev->ibh_mr_size = dev_attr->max_mr_size;
2565
2566         /* Setup device Memory Registration capabilities */
2567 #ifdef HAVE_IB_DEVICE_OPS
2568         if (hdev->ibh_ibdev->ops.alloc_fmr &&
2569             hdev->ibh_ibdev->ops.dealloc_fmr &&
2570             hdev->ibh_ibdev->ops.map_phys_fmr &&
2571             hdev->ibh_ibdev->ops.unmap_fmr) {
2572 #else
2573         if (hdev->ibh_ibdev->alloc_fmr &&
2574             hdev->ibh_ibdev->dealloc_fmr &&
2575             hdev->ibh_ibdev->map_phys_fmr &&
2576             hdev->ibh_ibdev->unmap_fmr) {
2577 #endif
2578                 LCONSOLE_INFO("Using FMR for registration\n");
2579                 hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FMR_ENABLED;
2580         } else if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
2581                 LCONSOLE_INFO("Using FastReg for registration\n");
2582                 hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FASTREG_ENABLED;
2583 #ifndef HAVE_IB_ALLOC_FAST_REG_MR
2584 #ifdef IB_DEVICE_SG_GAPS_REG
2585                 if (dev_attr->device_cap_flags & IB_DEVICE_SG_GAPS_REG)
2586                         hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT;
2587 #endif
2588 #endif
2589         } else {
2590                 rc = -ENOSYS;
2591         }
2592
2593         if (rc != 0)
2594                 rc = -EINVAL;
2595
2596 #ifndef HAVE_IB_DEVICE_ATTRS
2597 out_clean_attr:
2598         LIBCFS_FREE(dev_attr, sizeof(*dev_attr));
2599 #endif
2600
2601         if (rc == -ENOSYS)
2602                 CERROR("IB device does not support FMRs nor FastRegs, can't "
2603                        "register memory: %d\n", rc);
2604         else if (rc == -EINVAL)
2605                 CERROR("Invalid mr size: %#llx\n", hdev->ibh_mr_size);
2606         return rc;
2607 }
2608
2609 #ifdef HAVE_IB_GET_DMA_MR
2610 static void
2611 kiblnd_hdev_cleanup_mrs(struct kib_hca_dev *hdev)
2612 {
2613         if (hdev->ibh_mrs == NULL)
2614                 return;
2615
2616         ib_dereg_mr(hdev->ibh_mrs);
2617
2618         hdev->ibh_mrs = NULL;
2619 }
2620 #endif
2621
2622 void
2623 kiblnd_hdev_destroy(struct kib_hca_dev *hdev)
2624 {
2625 #ifdef HAVE_IB_GET_DMA_MR
2626         kiblnd_hdev_cleanup_mrs(hdev);
2627 #endif
2628
2629         if (hdev->ibh_pd != NULL)
2630                 ib_dealloc_pd(hdev->ibh_pd);
2631
2632         if (hdev->ibh_cmid != NULL)
2633                 rdma_destroy_id(hdev->ibh_cmid);
2634
2635         LIBCFS_FREE(hdev, sizeof(*hdev));
2636 }
2637
2638 #ifdef HAVE_IB_GET_DMA_MR
2639 static int
2640 kiblnd_hdev_setup_mrs(struct kib_hca_dev *hdev)
2641 {
2642         struct ib_mr *mr;
2643         int           acflags = IB_ACCESS_LOCAL_WRITE |
2644                                 IB_ACCESS_REMOTE_WRITE;
2645
2646         mr = ib_get_dma_mr(hdev->ibh_pd, acflags);
2647         if (IS_ERR(mr)) {
2648                 CERROR("Failed ib_get_dma_mr: %ld\n", PTR_ERR(mr));
2649                 kiblnd_hdev_cleanup_mrs(hdev);
2650                 return PTR_ERR(mr);
2651         }
2652
2653         hdev->ibh_mrs = mr;
2654
2655         return 0;
2656 }
2657 #endif
2658
2659 static int
2660 kiblnd_dummy_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2661 {       /* DUMMY */
2662         return 0;
2663 }
2664
2665 static int
2666 kiblnd_dev_need_failover(struct kib_dev *dev, struct net *ns)
2667 {
2668         struct rdma_cm_id  *cmid;
2669         struct sockaddr_in  srcaddr;
2670         struct sockaddr_in  dstaddr;
2671         int                 rc;
2672
2673         if (dev->ibd_hdev == NULL || /* initializing */
2674             dev->ibd_hdev->ibh_cmid == NULL || /* listener is dead */
2675             *kiblnd_tunables.kib_dev_failover > 1) /* debugging */
2676                 return 1;
2677
2678         /* XXX: it's UGLY, but I don't have better way to find
2679          * ib-bonding HCA failover because:
2680          *
2681          * a. no reliable CM event for HCA failover...
2682          * b. no OFED API to get ib_device for current net_device...
2683          *
2684          * We have only two choices at this point:
2685          *
2686          * a. rdma_bind_addr(), it will conflict with listener cmid
2687          * b. rdma_resolve_addr() to zero addr */
2688         cmid = kiblnd_rdma_create_id(ns, kiblnd_dummy_callback, dev,
2689                                      RDMA_PS_TCP, IB_QPT_RC);
2690         if (IS_ERR(cmid)) {
2691                 rc = PTR_ERR(cmid);
2692                 CERROR("Failed to create cmid for failover: %d\n", rc);
2693                 return rc;
2694         }
2695
2696         memset(&srcaddr, 0, sizeof(srcaddr));
2697         srcaddr.sin_family      = AF_INET;
2698         srcaddr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2699
2700         memset(&dstaddr, 0, sizeof(dstaddr));
2701         dstaddr.sin_family = AF_INET;
2702         rc = rdma_resolve_addr(cmid, (struct sockaddr *)&srcaddr,
2703                                (struct sockaddr *)&dstaddr, 1);
2704         if (rc != 0 || cmid->device == NULL) {
2705                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2706                        dev->ibd_ifname, &dev->ibd_ifip,
2707                        cmid->device, rc);
2708                 rdma_destroy_id(cmid);
2709                 return rc;
2710         }
2711
2712         rc = dev->ibd_hdev->ibh_ibdev != cmid->device; /* true for failover */
2713         rdma_destroy_id(cmid);
2714         return rc;
2715 }
2716
2717 int
2718 kiblnd_dev_failover(struct kib_dev *dev, struct net *ns)
2719 {
2720         struct list_head    zombie_tpo = LIST_HEAD_INIT(zombie_tpo);
2721         struct list_head    zombie_ppo = LIST_HEAD_INIT(zombie_ppo);
2722         struct list_head    zombie_fpo = LIST_HEAD_INIT(zombie_fpo);
2723         struct rdma_cm_id  *cmid  = NULL;
2724         struct kib_hca_dev *hdev  = NULL;
2725         struct kib_hca_dev *old;
2726         struct ib_pd       *pd;
2727         struct kib_net *net;
2728         struct sockaddr_in  addr;
2729         unsigned long       flags;
2730         int                 rc = 0;
2731         int                 i;
2732
2733         LASSERT (*kiblnd_tunables.kib_dev_failover > 1 ||
2734                  dev->ibd_can_failover ||
2735                  dev->ibd_hdev == NULL);
2736
2737         rc = kiblnd_dev_need_failover(dev, ns);
2738         if (rc <= 0)
2739                 goto out;
2740
2741         if (dev->ibd_hdev != NULL &&
2742             dev->ibd_hdev->ibh_cmid != NULL) {
2743                 /* XXX it's not good to close old listener at here,
2744                  * because we can fail to create new listener.
2745                  * But we have to close it now, otherwise rdma_bind_addr
2746                  * will return EADDRINUSE... How crap! */
2747                 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2748
2749                 cmid = dev->ibd_hdev->ibh_cmid;
2750                 /* make next schedule of kiblnd_dev_need_failover()
2751                  * return 1 for me */
2752                 dev->ibd_hdev->ibh_cmid  = NULL;
2753                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2754
2755                 rdma_destroy_id(cmid);
2756         }
2757
2758         cmid = kiblnd_rdma_create_id(ns, kiblnd_cm_callback, dev, RDMA_PS_TCP,
2759                                      IB_QPT_RC);
2760         if (IS_ERR(cmid)) {
2761                 rc = PTR_ERR(cmid);
2762                 CERROR("Failed to create cmid for failover: %d\n", rc);
2763                 goto out;
2764         }
2765
2766         memset(&addr, 0, sizeof(addr));
2767         addr.sin_family      = AF_INET;
2768         addr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2769         addr.sin_port        = htons(*kiblnd_tunables.kib_service);
2770
2771         /* Bind to failover device or port */
2772         rc = rdma_bind_addr(cmid, (struct sockaddr *)&addr);
2773         if (rc != 0 || cmid->device == NULL) {
2774                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2775                        dev->ibd_ifname, &dev->ibd_ifip,
2776                        cmid->device, rc);
2777                 rdma_destroy_id(cmid);
2778                 goto out;
2779         }
2780
2781         LIBCFS_ALLOC(hdev, sizeof(*hdev));
2782         if (hdev == NULL) {
2783                 CERROR("Failed to allocate kib_hca_dev\n");
2784                 rdma_destroy_id(cmid);
2785                 rc = -ENOMEM;
2786                 goto out;
2787         }
2788
2789         atomic_set(&hdev->ibh_ref, 1);
2790         hdev->ibh_dev   = dev;
2791         hdev->ibh_cmid  = cmid;
2792         hdev->ibh_ibdev = cmid->device;
2793
2794 #ifdef HAVE_IB_ALLOC_PD_2ARGS
2795         pd = ib_alloc_pd(cmid->device, 0);
2796 #else
2797         pd = ib_alloc_pd(cmid->device);
2798 #endif
2799         if (IS_ERR(pd)) {
2800                 rc = PTR_ERR(pd);
2801                 CERROR("Can't allocate PD: %d\n", rc);
2802                 goto out;
2803         }
2804
2805         hdev->ibh_pd = pd;
2806
2807         rc = rdma_listen(cmid, 0);
2808         if (rc != 0) {
2809                 CERROR("Can't start new listener: %d\n", rc);
2810                 goto out;
2811         }
2812
2813         rc = kiblnd_hdev_get_attr(hdev);
2814         if (rc != 0) {
2815                 CERROR("Can't get device attributes: %d\n", rc);
2816                 goto out;
2817         }
2818
2819 #ifdef HAVE_IB_GET_DMA_MR
2820         rc = kiblnd_hdev_setup_mrs(hdev);
2821         if (rc != 0) {
2822                 CERROR("Can't setup device: %d\n", rc);
2823                 goto out;
2824         }
2825 #endif
2826
2827         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2828
2829         old = dev->ibd_hdev;
2830         dev->ibd_hdev = hdev;   /* take over the refcount */
2831         hdev = old;
2832
2833         list_for_each_entry(net, &dev->ibd_nets, ibn_list) {
2834                 cfs_cpt_for_each(i, lnet_cpt_table()) {
2835                         kiblnd_fail_poolset(&net->ibn_tx_ps[i]->tps_poolset,
2836                                             &zombie_tpo);
2837
2838                         if (net->ibn_fmr_ps != NULL)
2839                                 kiblnd_fail_fmr_poolset(net->ibn_fmr_ps[i],
2840                                                         &zombie_fpo);
2841                 }
2842         }
2843
2844         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2845  out:
2846         if (!list_empty(&zombie_tpo))
2847                 kiblnd_destroy_pool_list(&zombie_tpo);
2848         if (!list_empty(&zombie_ppo))
2849                 kiblnd_destroy_pool_list(&zombie_ppo);
2850         if (!list_empty(&zombie_fpo))
2851                 kiblnd_destroy_fmr_pool_list(&zombie_fpo);
2852         if (hdev != NULL)
2853                 kiblnd_hdev_decref(hdev);
2854
2855         if (rc != 0)
2856                 dev->ibd_failed_failover++;
2857         else
2858                 dev->ibd_failed_failover = 0;
2859
2860         return rc;
2861 }
2862
2863 void
2864 kiblnd_destroy_dev(struct kib_dev *dev)
2865 {
2866         LASSERT(dev->ibd_nnets == 0);
2867         LASSERT(list_empty(&dev->ibd_nets));
2868
2869         list_del(&dev->ibd_fail_list);
2870         list_del(&dev->ibd_list);
2871
2872         if (dev->ibd_hdev != NULL)
2873                 kiblnd_hdev_decref(dev->ibd_hdev);
2874
2875         LIBCFS_FREE(dev, sizeof(*dev));
2876 }
2877
2878 static void
2879 kiblnd_base_shutdown(void)
2880 {
2881         struct kib_sched_info   *sched;
2882         int                     i;
2883
2884         LASSERT(list_empty(&kiblnd_data.kib_devs));
2885
2886         CDEBUG(D_MALLOC, "before LND base cleanup: kmem %d\n",
2887                atomic_read(&libcfs_kmemory));
2888
2889         switch (kiblnd_data.kib_init) {
2890         default:
2891                 LBUG();
2892
2893         case IBLND_INIT_ALL:
2894         case IBLND_INIT_DATA:
2895                 LASSERT (kiblnd_data.kib_peers != NULL);
2896                 for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
2897                         LASSERT(list_empty(&kiblnd_data.kib_peers[i]));
2898                 }
2899                 LASSERT(list_empty(&kiblnd_data.kib_connd_zombies));
2900                 LASSERT(list_empty(&kiblnd_data.kib_connd_conns));
2901                 LASSERT(list_empty(&kiblnd_data.kib_reconn_list));
2902                 LASSERT(list_empty(&kiblnd_data.kib_reconn_wait));
2903
2904                 /* flag threads to terminate; wake and wait for them to die */
2905                 kiblnd_data.kib_shutdown = 1;
2906
2907                 /* NB: we really want to stop scheduler threads net by net
2908                  * instead of the whole module, this should be improved
2909                  * with dynamic configuration LNet */
2910                 cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds)
2911                         wake_up_all(&sched->ibs_waitq);
2912
2913                 wake_up_all(&kiblnd_data.kib_connd_waitq);
2914                 wake_up_all(&kiblnd_data.kib_failover_waitq);
2915
2916                 i = 2;
2917                 while (atomic_read(&kiblnd_data.kib_nthreads) != 0) {
2918                         i++;
2919                         /* power of 2? */
2920                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2921                                "Waiting for %d threads to terminate\n",
2922                                atomic_read(&kiblnd_data.kib_nthreads));
2923                         set_current_state(TASK_UNINTERRUPTIBLE);
2924                         schedule_timeout(cfs_time_seconds(1));
2925                 }
2926
2927                 /* fall through */
2928
2929         case IBLND_INIT_NOTHING:
2930                 break;
2931         }
2932
2933         if (kiblnd_data.kib_peers != NULL) {
2934                 LIBCFS_FREE(kiblnd_data.kib_peers,
2935                             sizeof(struct list_head) *
2936                             kiblnd_data.kib_peer_hash_size);
2937         }
2938
2939         if (kiblnd_data.kib_scheds != NULL)
2940                 cfs_percpt_free(kiblnd_data.kib_scheds);
2941
2942         CDEBUG(D_MALLOC, "after LND base cleanup: kmem %d\n",
2943                atomic_read(&libcfs_kmemory));
2944
2945         kiblnd_data.kib_init = IBLND_INIT_NOTHING;
2946         module_put(THIS_MODULE);
2947 }
2948
2949 static void
2950 kiblnd_shutdown(struct lnet_ni *ni)
2951 {
2952         struct kib_net *net = ni->ni_data;
2953         rwlock_t     *g_lock = &kiblnd_data.kib_global_lock;
2954         int               i;
2955         unsigned long     flags;
2956
2957         LASSERT(kiblnd_data.kib_init == IBLND_INIT_ALL);
2958
2959         if (net == NULL)
2960                 goto out;
2961
2962         CDEBUG(D_MALLOC, "before LND net cleanup: kmem %d\n",
2963                atomic_read(&libcfs_kmemory));
2964
2965         write_lock_irqsave(g_lock, flags);
2966         net->ibn_shutdown = 1;
2967         write_unlock_irqrestore(g_lock, flags);
2968
2969         switch (net->ibn_init) {
2970         default:
2971                 LBUG();
2972
2973         case IBLND_INIT_ALL:
2974                 /* nuke all existing peers within this net */
2975                 kiblnd_del_peer(ni, LNET_NID_ANY);
2976
2977                 /* Wait for all peer_ni state to clean up */
2978                 i = 2;
2979                 while (atomic_read(&net->ibn_npeers) != 0) {
2980                         i++;
2981                         /* power of 2? */
2982                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2983                                "%s: waiting for %d peers to disconnect\n",
2984                                libcfs_nid2str(ni->ni_nid),
2985                                atomic_read(&net->ibn_npeers));
2986                         set_current_state(TASK_UNINTERRUPTIBLE);
2987                         schedule_timeout(cfs_time_seconds(1));
2988                 }
2989
2990                 kiblnd_net_fini_pools(net);
2991
2992                 write_lock_irqsave(g_lock, flags);
2993                 LASSERT(net->ibn_dev->ibd_nnets > 0);
2994                 net->ibn_dev->ibd_nnets--;
2995                 list_del(&net->ibn_list);
2996                 write_unlock_irqrestore(g_lock, flags);
2997
2998                 /* fall through */
2999
3000         case IBLND_INIT_NOTHING:
3001                 LASSERT (atomic_read(&net->ibn_nconns) == 0);
3002
3003                 if (net->ibn_dev != NULL &&
3004                     net->ibn_dev->ibd_nnets == 0)
3005                         kiblnd_destroy_dev(net->ibn_dev);
3006
3007                 break;
3008         }
3009
3010         CDEBUG(D_MALLOC, "after LND net cleanup: kmem %d\n",
3011                atomic_read(&libcfs_kmemory));
3012
3013         net->ibn_init = IBLND_INIT_NOTHING;
3014         ni->ni_data = NULL;
3015
3016         LIBCFS_FREE(net, sizeof(*net));
3017
3018 out:
3019         if (list_empty(&kiblnd_data.kib_devs))
3020                 kiblnd_base_shutdown();
3021         return;
3022 }
3023
3024 static int
3025 kiblnd_base_startup(struct net *ns)
3026 {
3027         struct kib_sched_info   *sched;
3028         int                     rc;
3029         int                     i;
3030
3031         LASSERT(kiblnd_data.kib_init == IBLND_INIT_NOTHING);
3032
3033         try_module_get(THIS_MODULE);
3034         memset(&kiblnd_data, 0, sizeof(kiblnd_data)); /* zero pointers, flags etc */
3035
3036         rwlock_init(&kiblnd_data.kib_global_lock);
3037
3038         INIT_LIST_HEAD(&kiblnd_data.kib_devs);
3039         INIT_LIST_HEAD(&kiblnd_data.kib_failed_devs);
3040
3041         kiblnd_data.kib_peer_hash_size = IBLND_PEER_HASH_SIZE;
3042         LIBCFS_ALLOC(kiblnd_data.kib_peers,
3043                      sizeof(struct list_head) *
3044                      kiblnd_data.kib_peer_hash_size);
3045         if (kiblnd_data.kib_peers == NULL)
3046                 goto failed;
3047
3048         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++)
3049                 INIT_LIST_HEAD(&kiblnd_data.kib_peers[i]);
3050
3051         spin_lock_init(&kiblnd_data.kib_connd_lock);
3052         INIT_LIST_HEAD(&kiblnd_data.kib_connd_conns);
3053         INIT_LIST_HEAD(&kiblnd_data.kib_connd_zombies);
3054         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_list);
3055         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_wait);
3056
3057         init_waitqueue_head(&kiblnd_data.kib_connd_waitq);
3058         init_waitqueue_head(&kiblnd_data.kib_failover_waitq);
3059
3060         kiblnd_data.kib_scheds = cfs_percpt_alloc(lnet_cpt_table(),
3061                                                   sizeof(*sched));
3062         if (kiblnd_data.kib_scheds == NULL)
3063                 goto failed;
3064
3065         cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
3066                 int     nthrs;
3067
3068                 spin_lock_init(&sched->ibs_lock);
3069                 INIT_LIST_HEAD(&sched->ibs_conns);
3070                 init_waitqueue_head(&sched->ibs_waitq);
3071
3072                 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
3073                 if (*kiblnd_tunables.kib_nscheds > 0) {
3074                         nthrs = min(nthrs, *kiblnd_tunables.kib_nscheds);
3075                 } else {
3076                         /* max to half of CPUs, another half is reserved for
3077                          * upper layer modules */
3078                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
3079                 }
3080
3081                 sched->ibs_nthreads_max = nthrs;
3082                 sched->ibs_cpt = i;
3083         }
3084
3085         kiblnd_data.kib_error_qpa.qp_state = IB_QPS_ERR;
3086
3087         /* lists/ptrs/locks initialised */
3088         kiblnd_data.kib_init = IBLND_INIT_DATA;
3089         /*****************************************************/
3090
3091         rc = kiblnd_thread_start(kiblnd_connd, NULL, "kiblnd_connd");
3092         if (rc != 0) {
3093                 CERROR("Can't spawn o2iblnd connd: %d\n", rc);
3094                 goto failed;
3095         }
3096
3097         if (*kiblnd_tunables.kib_dev_failover != 0)
3098                 rc = kiblnd_thread_start(kiblnd_failover_thread, ns,
3099                                          "kiblnd_failover");
3100
3101         if (rc != 0) {
3102                 CERROR("Can't spawn o2iblnd failover thread: %d\n", rc);
3103                 goto failed;
3104         }
3105
3106         /* flag everything initialised */
3107         kiblnd_data.kib_init = IBLND_INIT_ALL;
3108         /*****************************************************/
3109
3110         return 0;
3111
3112  failed:
3113         kiblnd_base_shutdown();
3114         return -ENETDOWN;
3115 }
3116
3117 static int
3118 kiblnd_start_schedulers(struct kib_sched_info *sched)
3119 {
3120         int     rc = 0;
3121         int     nthrs;
3122         int     i;
3123
3124         if (sched->ibs_nthreads == 0) {
3125                 if (*kiblnd_tunables.kib_nscheds > 0) {
3126                         nthrs = sched->ibs_nthreads_max;
3127                 } else {
3128                         nthrs = cfs_cpt_weight(lnet_cpt_table(),
3129                                                sched->ibs_cpt);
3130                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
3131                         nthrs = min(IBLND_N_SCHED_HIGH, nthrs);
3132                 }
3133         } else {
3134                 LASSERT(sched->ibs_nthreads <= sched->ibs_nthreads_max);
3135                 /* increase one thread if there is new interface */
3136                 nthrs = (sched->ibs_nthreads < sched->ibs_nthreads_max);
3137         }
3138
3139         for (i = 0; i < nthrs; i++) {
3140                 long    id;
3141                 char    name[20];
3142                 id = KIB_THREAD_ID(sched->ibs_cpt, sched->ibs_nthreads + i);
3143                 snprintf(name, sizeof(name), "kiblnd_sd_%02ld_%02ld",
3144                          KIB_THREAD_CPT(id), KIB_THREAD_TID(id));
3145                 rc = kiblnd_thread_start(kiblnd_scheduler, (void *)id, name);
3146                 if (rc == 0)
3147                         continue;
3148
3149                 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
3150                        sched->ibs_cpt, sched->ibs_nthreads + i, rc);
3151                 break;
3152         }
3153
3154         sched->ibs_nthreads += i;
3155         return rc;
3156 }
3157
3158 static int kiblnd_dev_start_threads(struct kib_dev *dev, u32 *cpts, int ncpts)
3159 {
3160         int     cpt;
3161         int     rc;
3162         int     i;
3163
3164         for (i = 0; i < ncpts; i++) {
3165                 struct kib_sched_info *sched;
3166
3167                 cpt = (cpts == NULL) ? i : cpts[i];
3168                 sched = kiblnd_data.kib_scheds[cpt];
3169
3170                 if (sched->ibs_nthreads > 0)
3171                         continue;
3172
3173                 rc = kiblnd_start_schedulers(kiblnd_data.kib_scheds[cpt]);
3174                 if (rc != 0) {
3175                         CERROR("Failed to start scheduler threads for %s\n",
3176                                dev->ibd_ifname);
3177                         return rc;
3178                 }
3179         }
3180         return 0;
3181 }
3182
3183 static int
3184 kiblnd_startup(struct lnet_ni *ni)
3185 {
3186         char                     *ifname;
3187         struct lnet_inetdev *ifaces = NULL;
3188         struct kib_dev *ibdev = NULL;
3189         struct kib_net *net;
3190         unsigned long             flags;
3191         int                       rc;
3192         int i;
3193
3194         LASSERT (ni->ni_net->net_lnd == &the_o2iblnd);
3195
3196         if (kiblnd_data.kib_init == IBLND_INIT_NOTHING) {
3197                 rc = kiblnd_base_startup(ni->ni_net_ns);
3198                 if (rc != 0)
3199                         return rc;
3200         }
3201
3202         LIBCFS_ALLOC(net, sizeof(*net));
3203         ni->ni_data = net;
3204         if (net == NULL)
3205                 goto failed;
3206
3207         net->ibn_incarnation = ktime_get_real_ns() / NSEC_PER_USEC;
3208
3209         kiblnd_tunables_setup(ni);
3210
3211         /*
3212          * ni_interfaces is only to support legacy pre Multi-Rail
3213          * tcp bonding for ksocklnd. Multi-Rail wants each secondary
3214          * IP to be treated as an unique 'struct ni' interfaces instead.
3215          */
3216         if (ni->ni_interfaces[0] != NULL) {
3217                 /* Use the IPoIB interface specified in 'networks=' */
3218                 if (ni->ni_interfaces[1] != NULL) {
3219                         CERROR("ko2iblnd: Multiple interfaces not supported\n");
3220                         goto failed;
3221                 }
3222
3223                 ifname = ni->ni_interfaces[0];
3224         } else {
3225                 ifname = *kiblnd_tunables.kib_default_ipif;
3226         }
3227
3228         if (strlen(ifname) >= sizeof(ibdev->ibd_ifname)) {
3229                 CERROR("IPoIB interface name too long: %s\n", ifname);
3230                 goto failed;
3231         }
3232
3233         rc = lnet_inet_enumerate(&ifaces, ni->ni_net_ns);
3234         if (rc < 0)
3235                 goto failed;
3236
3237         for (i = 0; i < rc; i++) {
3238                 if (strcmp(ifname, ifaces[i].li_name) == 0)
3239                         break;
3240         }
3241
3242         if (i == rc) {
3243                 CERROR("ko2iblnd: No matching interfaces\n");
3244                 rc = -ENOENT;
3245                 goto failed;
3246         }
3247
3248         LIBCFS_ALLOC(ibdev, sizeof(*ibdev));
3249         if (!ibdev) {
3250                 rc = -ENOMEM;
3251                 goto failed;
3252         }
3253
3254         ibdev->ibd_ifip = ifaces[i].li_ipaddr;
3255         strlcpy(ibdev->ibd_ifname, ifaces[i].li_name,
3256                 sizeof(ibdev->ibd_ifname));
3257         ibdev->ibd_can_failover = !!(ifaces[i].li_flags & IFF_MASTER);
3258
3259         INIT_LIST_HEAD(&ibdev->ibd_nets);
3260         INIT_LIST_HEAD(&ibdev->ibd_list); /* not yet in kib_devs */
3261         INIT_LIST_HEAD(&ibdev->ibd_fail_list);
3262
3263         /* initialize the device */
3264         rc = kiblnd_dev_failover(ibdev, ni->ni_net_ns);
3265         if (rc) {
3266                 CERROR("ko2iblnd: Can't initialize device: rc = %d\n", rc);
3267                 goto failed;
3268         }
3269
3270         list_add_tail(&ibdev->ibd_list, &kiblnd_data.kib_devs);
3271
3272         net->ibn_dev = ibdev;
3273         ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), ibdev->ibd_ifip);
3274
3275         ni->ni_dev_cpt = ifaces[i].li_cpt;
3276
3277         rc = kiblnd_dev_start_threads(ibdev, ni->ni_cpts, ni->ni_ncpts);
3278         if (rc != 0)
3279                 goto failed;
3280
3281         rc = kiblnd_net_init_pools(net, ni, ni->ni_cpts, ni->ni_ncpts);
3282         if (rc != 0) {
3283                 CERROR("Failed to initialize NI pools: %d\n", rc);
3284                 goto failed;
3285         }
3286
3287         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3288         ibdev->ibd_nnets++;
3289         list_add_tail(&net->ibn_list, &ibdev->ibd_nets);
3290         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3291
3292         net->ibn_init = IBLND_INIT_ALL;
3293
3294         return 0;
3295
3296 failed:
3297         if (net != NULL && net->ibn_dev == NULL && ibdev != NULL)
3298                 kiblnd_destroy_dev(ibdev);
3299
3300         kfree(ifaces);
3301         kiblnd_shutdown(ni);
3302
3303         CDEBUG(D_NET, "kiblnd_startup failed\n");
3304         return -ENETDOWN;
3305 }
3306
3307 static struct lnet_lnd the_o2iblnd = {
3308         .lnd_type       = O2IBLND,
3309         .lnd_startup    = kiblnd_startup,
3310         .lnd_shutdown   = kiblnd_shutdown,
3311         .lnd_ctl        = kiblnd_ctl,
3312         .lnd_query      = kiblnd_query,
3313         .lnd_send       = kiblnd_send,
3314         .lnd_recv       = kiblnd_recv,
3315 };
3316
3317 static void __exit ko2iblnd_exit(void)
3318 {
3319         lnet_unregister_lnd(&the_o2iblnd);
3320 }
3321
3322 static int __init ko2iblnd_init(void)
3323 {
3324         int rc;
3325
3326         CLASSERT(sizeof(struct kib_msg) <= IBLND_MSG_SIZE);
3327         CLASSERT(offsetof(struct kib_msg,
3328                           ibm_u.get.ibgm_rd.rd_frags[IBLND_MAX_RDMA_FRAGS]) <=
3329                  IBLND_MSG_SIZE);
3330         CLASSERT(offsetof(struct kib_msg,
3331                           ibm_u.putack.ibpam_rd.rd_frags[IBLND_MAX_RDMA_FRAGS])
3332                  <= IBLND_MSG_SIZE);
3333
3334         rc = kiblnd_tunables_init();
3335         if (rc != 0)
3336                 return rc;
3337
3338         lnet_register_lnd(&the_o2iblnd);
3339
3340         return 0;
3341 }
3342
3343 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3344 MODULE_DESCRIPTION("OpenIB gen2 LNet Network Driver");
3345 MODULE_VERSION("2.8.0");
3346 MODULE_LICENSE("GPL");
3347
3348 module_init(ko2iblnd_init);
3349 module_exit(ko2iblnd_exit);