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 const struct lnet_lnd the_o2iblnd;
  43
  44 struct kib_data kiblnd_data;
  45
  46 static __u32
  47 kiblnd_cksum (void *ptr, int nob)
  48 {
  49         char  *c  = ptr;
  50         __u32  sum = 0;
  51
  52         while (nob-- > 0)
  53                 sum = ((sum << 1) | (sum >> 31)) + *c++;
  54
  55         /* ensure I don't return 0 (== no checksum) */
  56         return (sum == 0) ? 1 : sum;
  57 }
  58
  59 static char *
  60 kiblnd_msgtype2str(int type)
  61 {
  62         switch (type) {
  63         case IBLND_MSG_CONNREQ:
  64                 return "CONNREQ";
  65
  66         case IBLND_MSG_CONNACK:
  67                 return "CONNACK";
  68
  69         case IBLND_MSG_NOOP:
  70                 return "NOOP";
  71
  72         case IBLND_MSG_IMMEDIATE:
  73                 return "IMMEDIATE";
  74
  75         case IBLND_MSG_PUT_REQ:
  76                 return "PUT_REQ";
  77
  78         case IBLND_MSG_PUT_NAK:
  79                 return "PUT_NAK";
  80
  81         case IBLND_MSG_PUT_ACK:
  82                 return "PUT_ACK";
  83
  84         case IBLND_MSG_PUT_DONE:
  85                 return "PUT_DONE";
  86
  87         case IBLND_MSG_GET_REQ:
  88                 return "GET_REQ";
  89
  90         case IBLND_MSG_GET_DONE:
  91                 return "GET_DONE";
  92
  93         default:
  94                 return "???";
  95         }
  96 }
  97
  98 static int
  99 kiblnd_msgtype2size(int type)
 100 {
 101         const int hdr_size = offsetof(struct kib_msg, ibm_u);
 102
 103         switch (type) {
 104         case IBLND_MSG_CONNREQ:
 105         case IBLND_MSG_CONNACK:
 106                 return hdr_size + sizeof(struct kib_connparams);
 107
 108         case IBLND_MSG_NOOP:
 109                 return hdr_size;
 110
 111         case IBLND_MSG_IMMEDIATE:
 112                 return offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[0]);
 113
 114         case IBLND_MSG_PUT_REQ:
 115                 return hdr_size + sizeof(struct kib_putreq_msg);
 116
 117         case IBLND_MSG_PUT_ACK:
 118                 return hdr_size + sizeof(struct kib_putack_msg);
 119
 120         case IBLND_MSG_GET_REQ:
 121                 return hdr_size + sizeof(struct kib_get_msg);
 122
 123         case IBLND_MSG_PUT_NAK:
 124         case IBLND_MSG_PUT_DONE:
 125         case IBLND_MSG_GET_DONE:
 126                 return hdr_size + sizeof(struct kib_completion_msg);
 127         default:
 128                 return -1;
 129         }
 130 }
 131
 132 static int kiblnd_unpack_rd(struct kib_msg *msg, 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                 BUILD_BUG_ON(sizeof(msg->ibm_type) != 1);
 260                 BUILD_BUG_ON(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         if (atomic_dec_and_test(&net->ibn_npeers))
 376                 wake_up_var(&net->ibn_npeers);
 377 }
 378
 379 struct kib_peer_ni *
 380 kiblnd_find_peer_locked(struct lnet_ni *ni, lnet_nid_t nid)
 381 {
 382         /* the caller is responsible for accounting the additional reference
 383          * that this creates */
 384         struct list_head        *peer_list = kiblnd_nid2peerlist(nid);
 385         struct list_head        *tmp;
 386         struct kib_peer_ni              *peer_ni;
 387
 388         list_for_each(tmp, peer_list) {
 389
 390                 peer_ni = list_entry(tmp, struct kib_peer_ni, ibp_list);
 391                 LASSERT(!kiblnd_peer_idle(peer_ni));
 392
 393                 /*
 394                  * Match a peer if its NID and the NID of the local NI it
 395                  * communicates over are the same. Otherwise don't match
 396                  * the peer, which will result in a new lnd peer being
 397                  * created.
 398                  */
 399                 if (peer_ni->ibp_nid != nid ||
 400                     peer_ni->ibp_ni->ni_nid != ni->ni_nid)
 401                         continue;
 402
 403                 CDEBUG(D_NET, "got peer_ni [%p] -> %s (%d) version: %x\n",
 404                        peer_ni, libcfs_nid2str(nid),
 405                        atomic_read(&peer_ni->ibp_refcount),
 406                        peer_ni->ibp_version);
 407                 return peer_ni;
 408         }
 409         return NULL;
 410 }
 411
 412 void
 413 kiblnd_unlink_peer_locked(struct kib_peer_ni *peer_ni)
 414 {
 415         LASSERT(list_empty(&peer_ni->ibp_conns));
 416
 417         LASSERT (kiblnd_peer_active(peer_ni));
 418         list_del_init(&peer_ni->ibp_list);
 419         /* lose peerlist's ref */
 420         kiblnd_peer_decref(peer_ni);
 421 }
 422
 423 static int
 424 kiblnd_get_peer_info(struct lnet_ni *ni, int index,
 425                      lnet_nid_t *nidp, int *count)
 426 {
 427         struct kib_peer_ni              *peer_ni;
 428         struct list_head        *ptmp;
 429         int                      i;
 430         unsigned long            flags;
 431
 432         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 433
 434         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
 435
 436                 list_for_each(ptmp, &kiblnd_data.kib_peers[i]) {
 437
 438                         peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);
 439                         LASSERT(!kiblnd_peer_idle(peer_ni));
 440
 441                         if (peer_ni->ibp_ni != ni)
 442                                 continue;
 443
 444                         if (index-- > 0)
 445                                 continue;
 446
 447                         *nidp = peer_ni->ibp_nid;
 448                         *count = atomic_read(&peer_ni->ibp_refcount);
 449
 450                         read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
 451                                                flags);
 452                         return 0;
 453                 }
 454         }
 455
 456         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 457         return -ENOENT;
 458 }
 459
 460 static void
 461 kiblnd_del_peer_locked(struct kib_peer_ni *peer_ni)
 462 {
 463         struct list_head *ctmp;
 464         struct list_head *cnxt;
 465         struct kib_conn *conn;
 466
 467         if (list_empty(&peer_ni->ibp_conns)) {
 468                 kiblnd_unlink_peer_locked(peer_ni);
 469         } else {
 470                 list_for_each_safe(ctmp, cnxt, &peer_ni->ibp_conns) {
 471                         conn = list_entry(ctmp, struct kib_conn, ibc_list);
 472
 473                         kiblnd_close_conn_locked(conn, 0);
 474                 }
 475                 /* NB closing peer_ni's last conn unlinked it. */
 476         }
 477         /* NB peer_ni now unlinked; might even be freed if the peer_ni table had the
 478          * last ref on it. */
 479 }
 480
 481 static int
 482 kiblnd_del_peer(struct lnet_ni *ni, lnet_nid_t nid)
 483 {
 484         LIST_HEAD(zombies);
 485         struct list_head        *ptmp;
 486         struct list_head        *pnxt;
 487         struct kib_peer_ni              *peer_ni;
 488         int                     lo;
 489         int                     hi;
 490         int                     i;
 491         unsigned long           flags;
 492         int                     rc = -ENOENT;
 493
 494         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 495
 496         if (nid != LNET_NID_ANY) {
 497                 lo = hi = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
 498         } else {
 499                 lo = 0;
 500                 hi = kiblnd_data.kib_peer_hash_size - 1;
 501         }
 502
 503         for (i = lo; i <= hi; i++) {
 504                 list_for_each_safe(ptmp, pnxt, &kiblnd_data.kib_peers[i]) {
 505                         peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);
 506                         LASSERT(!kiblnd_peer_idle(peer_ni));
 507
 508                         if (peer_ni->ibp_ni != ni)
 509                                 continue;
 510
 511                         if (!(nid == LNET_NID_ANY || peer_ni->ibp_nid == nid))
 512                                 continue;
 513
 514                         if (!list_empty(&peer_ni->ibp_tx_queue)) {
 515                                 LASSERT(list_empty(&peer_ni->ibp_conns));
 516
 517                                 list_splice_init(&peer_ni->ibp_tx_queue,
 518                                                  &zombies);
 519                         }
 520
 521                         kiblnd_del_peer_locked(peer_ni);
 522                         rc = 0;         /* matched something */
 523                 }
 524         }
 525
 526         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 527
 528         kiblnd_txlist_done(&zombies, -EIO, LNET_MSG_STATUS_LOCAL_ERROR);
 529
 530         return rc;
 531 }
 532
 533 static struct kib_conn *
 534 kiblnd_get_conn_by_idx(struct lnet_ni *ni, int index)
 535 {
 536         struct kib_peer_ni              *peer_ni;
 537         struct list_head        *ptmp;
 538         struct kib_conn *conn;
 539         struct list_head        *ctmp;
 540         int                     i;
 541         unsigned long           flags;
 542
 543         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 544
 545         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
 546                 list_for_each(ptmp, &kiblnd_data.kib_peers[i]) {
 547
 548                         peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);
 549                         LASSERT(!kiblnd_peer_idle(peer_ni));
 550
 551                         if (peer_ni->ibp_ni != ni)
 552                                 continue;
 553
 554                         list_for_each(ctmp, &peer_ni->ibp_conns) {
 555                                 if (index-- > 0)
 556                                         continue;
 557
 558                                 conn = list_entry(ctmp, struct kib_conn, ibc_list);
 559                                 kiblnd_conn_addref(conn);
 560                                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
 561                                                        flags);
 562                                 return conn;
 563                         }
 564                 }
 565         }
 566
 567         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 568         return NULL;
 569 }
 570
 571 static void
 572 kiblnd_debug_rx(struct kib_rx *rx)
 573 {
 574         CDEBUG(D_CONSOLE, "      %p msg_type %x cred %d\n",
 575                rx, rx->rx_msg->ibm_type,
 576                rx->rx_msg->ibm_credits);
 577 }
 578
 579 static void
 580 kiblnd_debug_tx(struct kib_tx *tx)
 581 {
 582         CDEBUG(D_CONSOLE, "      %p snd %d q %d w %d rc %d dl %lld "
 583                "cookie %#llx msg %s%s type %x cred %d\n",
 584                tx, tx->tx_sending, tx->tx_queued, tx->tx_waiting,
 585                tx->tx_status, ktime_to_ns(tx->tx_deadline), tx->tx_cookie,
 586                tx->tx_lntmsg[0] == NULL ? "-" : "!",
 587                tx->tx_lntmsg[1] == NULL ? "-" : "!",
 588                tx->tx_msg->ibm_type, tx->tx_msg->ibm_credits);
 589 }
 590
 591 void
 592 kiblnd_debug_conn(struct kib_conn *conn)
 593 {
 594         struct list_head        *tmp;
 595         int                     i;
 596
 597         spin_lock(&conn->ibc_lock);
 598
 599         CDEBUG(D_CONSOLE, "conn[%d] %p [version %x] -> %s:\n",
 600                atomic_read(&conn->ibc_refcount), conn,
 601                conn->ibc_version, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 602         CDEBUG(D_CONSOLE, "   state %d nposted %d/%d cred %d o_cred %d "
 603                " r_cred %d\n", conn->ibc_state, conn->ibc_noops_posted,
 604                conn->ibc_nsends_posted, conn->ibc_credits,
 605                conn->ibc_outstanding_credits, conn->ibc_reserved_credits);
 606         CDEBUG(D_CONSOLE, "   comms_err %d\n", conn->ibc_comms_error);
 607
 608         CDEBUG(D_CONSOLE, "   early_rxs:\n");
 609         list_for_each(tmp, &conn->ibc_early_rxs)
 610                 kiblnd_debug_rx(list_entry(tmp, struct kib_rx, rx_list));
 611
 612         CDEBUG(D_CONSOLE, "   tx_noops:\n");
 613         list_for_each(tmp, &conn->ibc_tx_noops)
 614                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 615
 616         CDEBUG(D_CONSOLE, "   tx_queue_nocred:\n");
 617         list_for_each(tmp, &conn->ibc_tx_queue_nocred)
 618                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 619
 620         CDEBUG(D_CONSOLE, "   tx_queue_rsrvd:\n");
 621         list_for_each(tmp, &conn->ibc_tx_queue_rsrvd)
 622                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 623
 624         CDEBUG(D_CONSOLE, "   tx_queue:\n");
 625         list_for_each(tmp, &conn->ibc_tx_queue)
 626                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 627
 628         CDEBUG(D_CONSOLE, "   active_txs:\n");
 629         list_for_each(tmp, &conn->ibc_active_txs)
 630                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 631
 632         CDEBUG(D_CONSOLE, "   rxs:\n");
 633         for (i = 0; i < IBLND_RX_MSGS(conn); i++)
 634                 kiblnd_debug_rx(&conn->ibc_rxs[i]);
 635
 636         spin_unlock(&conn->ibc_lock);
 637 }
 638
 639 int
 640 kiblnd_translate_mtu(int value)
 641 {
 642         switch (value) {
 643         default:
 644                 return -1;
 645         case 0:
 646                 return 0;
 647         case 256:
 648                 return IB_MTU_256;
 649         case 512:
 650                 return IB_MTU_512;
 651         case 1024:
 652                 return IB_MTU_1024;
 653         case 2048:
 654                 return IB_MTU_2048;
 655         case 4096:
 656                 return IB_MTU_4096;
 657         }
 658 }
 659
 660 static void
 661 kiblnd_setup_mtu_locked(struct rdma_cm_id *cmid)
 662 {
 663         int           mtu;
 664
 665         /* XXX There is no path record for iWARP, set by netdev->change_mtu? */
 666         if (cmid->route.path_rec == NULL)
 667                 return;
 668
 669         mtu = kiblnd_translate_mtu(*kiblnd_tunables.kib_ib_mtu);
 670         LASSERT (mtu >= 0);
 671         if (mtu != 0)
 672                 cmid->route.path_rec->mtu = mtu;
 673 }
 674
 675 static int
 676 kiblnd_get_completion_vector(struct kib_conn *conn, int cpt)
 677 {
 678         cpumask_var_t   *mask;
 679         int             vectors;
 680         int             off;
 681         int             i;
 682         lnet_nid_t      ibp_nid;
 683
 684         vectors = conn->ibc_cmid->device->num_comp_vectors;
 685         if (vectors <= 1)
 686                 return 0;
 687
 688         mask = cfs_cpt_cpumask(lnet_cpt_table(), cpt);
 689
 690         /* hash NID to CPU id in this partition... */
 691         ibp_nid = conn->ibc_peer->ibp_nid;
 692         off = do_div(ibp_nid, cpumask_weight(*mask));
 693         for_each_cpu(i, *mask) {
 694                 if (off-- == 0)
 695                         return i % vectors;
 696         }
 697
 698         LBUG();
 699         return 1;
 700 }
 701
 702 /*
 703  * Get the scheduler bound to this CPT. If the scheduler has no
 704  * threads, which means that the CPT has no CPUs, then grab the
 705  * next scheduler that we can use.
 706  *
 707  * This case would be triggered if a NUMA node is configured with
 708  * no associated CPUs.
 709  */
 710 static struct kib_sched_info *
 711 kiblnd_get_scheduler(int cpt)
 712 {
 713         struct kib_sched_info *sched;
 714         int i;
 715
 716         sched = kiblnd_data.kib_scheds[cpt];
 717
 718         if (sched->ibs_nthreads > 0)
 719                 return sched;
 720
 721         cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
 722                 if (sched->ibs_nthreads > 0) {
 723                         CDEBUG(D_NET, "scheduler[%d] has no threads. selected scheduler[%d]\n",
 724                                         cpt, sched->ibs_cpt);
 725                         return sched;
 726                 }
 727         }
 728
 729         return NULL;
 730 }
 731
 732 static unsigned int kiblnd_send_wrs(struct kib_conn *conn)
 733 {
 734         /*
 735          * One WR for the LNet message
 736          * And ibc_max_frags for the transfer WRs
 737          */
 738         int ret;
 739         int multiplier = 1 + conn->ibc_max_frags;
 740         enum kib_dev_caps dev_caps = conn->ibc_hdev->ibh_dev->ibd_dev_caps;
 741
 742         /* FastReg needs two extra WRs for map and invalidate */
 743         if (dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED)
 744                 multiplier += 2;
 745
 746         /* account for a maximum of ibc_queue_depth in-flight transfers */
 747         ret = multiplier * conn->ibc_queue_depth;
 748
 749         if (ret > conn->ibc_hdev->ibh_max_qp_wr) {
 750                 CDEBUG(D_NET, "peer_credits %u will result in send work "
 751                        "request size %d larger than maximum %d device "
 752                        "can handle\n", conn->ibc_queue_depth, ret,
 753                        conn->ibc_hdev->ibh_max_qp_wr);
 754                 conn->ibc_queue_depth =
 755                         conn->ibc_hdev->ibh_max_qp_wr / multiplier;
 756         }
 757
 758         /* don't go beyond the maximum the device can handle */
 759         return min(ret, conn->ibc_hdev->ibh_max_qp_wr);
 760 }
 761
 762 struct kib_conn *
 763 kiblnd_create_conn(struct kib_peer_ni *peer_ni, struct rdma_cm_id *cmid,
 764                    int state, int version)
 765 {
 766         /* CAVEAT EMPTOR:
 767          * If the new conn is created successfully it takes over the caller's
 768          * ref on 'peer_ni'.  It also "owns" 'cmid' and destroys it when it itself
 769          * is destroyed.  On failure, the caller's ref on 'peer_ni' remains and
 770          * she must dispose of 'cmid'.  (Actually I'd block forever if I tried
 771          * to destroy 'cmid' here since I'm called from the CM which still has
 772          * its ref on 'cmid'). */
 773         rwlock_t               *glock = &kiblnd_data.kib_global_lock;
 774         struct kib_net              *net = peer_ni->ibp_ni->ni_data;
 775         struct kib_dev *dev;
 776         struct ib_qp_init_attr *init_qp_attr;
 777         struct kib_sched_info   *sched;
 778 #ifdef HAVE_IB_CQ_INIT_ATTR
 779         struct ib_cq_init_attr  cq_attr = {};
 780 #endif
 781         struct kib_conn *conn;
 782         struct ib_cq            *cq;
 783         unsigned long           flags;
 784         int                     cpt;
 785         int                     rc;
 786         int                     i;
 787
 788         LASSERT(net != NULL);
 789         LASSERT(!in_interrupt());
 790
 791         dev = net->ibn_dev;
 792
 793         cpt = lnet_cpt_of_nid(peer_ni->ibp_nid, peer_ni->ibp_ni);
 794         sched = kiblnd_get_scheduler(cpt);
 795
 796         if (sched == NULL) {
 797                 CERROR("no schedulers available. node is unhealthy\n");
 798                 goto failed_0;
 799         }
 800
 801         /*
 802          * The cpt might have changed if we ended up selecting a non cpt
 803          * native scheduler. So use the scheduler's cpt instead.
 804          */
 805         cpt = sched->ibs_cpt;
 806
 807         LIBCFS_CPT_ALLOC(init_qp_attr, lnet_cpt_table(), cpt,
 808                          sizeof(*init_qp_attr));
 809         if (init_qp_attr == NULL) {
 810                 CERROR("Can't allocate qp_attr for %s\n",
 811                        libcfs_nid2str(peer_ni->ibp_nid));
 812                 goto failed_0;
 813         }
 814
 815         LIBCFS_CPT_ALLOC(conn, lnet_cpt_table(), cpt, sizeof(*conn));
 816         if (conn == NULL) {
 817                 CERROR("Can't allocate connection for %s\n",
 818                        libcfs_nid2str(peer_ni->ibp_nid));
 819                 goto failed_1;
 820         }
 821
 822         conn->ibc_state = IBLND_CONN_INIT;
 823         conn->ibc_version = version;
 824         conn->ibc_peer = peer_ni;                       /* I take the caller's ref */
 825         cmid->context = conn;                   /* for future CM callbacks */
 826         conn->ibc_cmid = cmid;
 827         conn->ibc_max_frags = peer_ni->ibp_max_frags;
 828         conn->ibc_queue_depth = peer_ni->ibp_queue_depth;
 829         conn->ibc_rxs = NULL;
 830         conn->ibc_rx_pages = NULL;
 831
 832         INIT_LIST_HEAD(&conn->ibc_early_rxs);
 833         INIT_LIST_HEAD(&conn->ibc_tx_noops);
 834         INIT_LIST_HEAD(&conn->ibc_tx_queue);
 835         INIT_LIST_HEAD(&conn->ibc_tx_queue_rsrvd);
 836         INIT_LIST_HEAD(&conn->ibc_tx_queue_nocred);
 837         INIT_LIST_HEAD(&conn->ibc_active_txs);
 838         INIT_LIST_HEAD(&conn->ibc_zombie_txs);
 839         spin_lock_init(&conn->ibc_lock);
 840
 841         LIBCFS_CPT_ALLOC(conn->ibc_connvars, lnet_cpt_table(), cpt,
 842                          sizeof(*conn->ibc_connvars));
 843         if (conn->ibc_connvars == NULL) {
 844                 CERROR("Can't allocate in-progress connection state\n");
 845                 goto failed_2;
 846         }
 847
 848         write_lock_irqsave(glock, flags);
 849         if (dev->ibd_failover) {
 850                 write_unlock_irqrestore(glock, flags);
 851                 CERROR("%s: failover in progress\n", dev->ibd_ifname);
 852                 goto failed_2;
 853         }
 854
 855         if (dev->ibd_hdev->ibh_ibdev != cmid->device) {
 856                 /* wakeup failover thread and teardown connection */
 857                 if (kiblnd_dev_can_failover(dev)) {
 858                         list_add_tail(&dev->ibd_fail_list,
 859                                       &kiblnd_data.kib_failed_devs);
 860                         wake_up(&kiblnd_data.kib_failover_waitq);
 861                 }
 862
 863                 write_unlock_irqrestore(glock, flags);
 864                 CERROR("cmid HCA(%s), kib_dev(%s) need failover\n",
 865                        cmid->device->name, dev->ibd_ifname);
 866                 goto failed_2;
 867         }
 868
 869         kiblnd_hdev_addref_locked(dev->ibd_hdev);
 870         conn->ibc_hdev = dev->ibd_hdev;
 871
 872         kiblnd_setup_mtu_locked(cmid);
 873
 874         write_unlock_irqrestore(glock, flags);
 875
 876 #ifdef HAVE_IB_CQ_INIT_ATTR
 877         cq_attr.cqe = IBLND_CQ_ENTRIES(conn);
 878         cq_attr.comp_vector = kiblnd_get_completion_vector(conn, cpt);
 879         cq = ib_create_cq(cmid->device,
 880                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 881                           &cq_attr);
 882 #else
 883         cq = ib_create_cq(cmid->device,
 884                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 885                           IBLND_CQ_ENTRIES(conn),
 886                           kiblnd_get_completion_vector(conn, cpt));
 887 #endif
 888         if (IS_ERR(cq)) {
 889                 /*
 890                  * on MLX-5 (possibly MLX-4 as well) this error could be
 891                  * hit if the concurrent_sends and/or peer_tx_credits is set
 892                  * too high. Or due to an MLX-5 bug which tries to
 893                  * allocate 256kb via kmalloc for WR cookie array
 894                  */
 895                 CERROR("Failed to create CQ with %d CQEs: %ld\n",
 896                         IBLND_CQ_ENTRIES(conn), PTR_ERR(cq));
 897                 goto failed_2;
 898         }
 899
 900         conn->ibc_cq = cq;
 901
 902         rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 903         if (rc != 0) {
 904                 CERROR("Can't request completion notification: %d\n", rc);
 905                 goto failed_2;
 906         }
 907
 908         init_qp_attr->event_handler = kiblnd_qp_event;
 909         init_qp_attr->qp_context = conn;
 910         init_qp_attr->cap.max_send_sge = *kiblnd_tunables.kib_wrq_sge;
 911         init_qp_attr->cap.max_recv_sge = 1;
 912         init_qp_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
 913         init_qp_attr->qp_type = IB_QPT_RC;
 914         init_qp_attr->send_cq = cq;
 915         init_qp_attr->recv_cq = cq;
 916         /*
 917          * kiblnd_send_wrs() can change the connection's queue depth if
 918          * the maximum work requests for the device is maxed out
 919          */
 920         init_qp_attr->cap.max_send_wr = kiblnd_send_wrs(conn);
 921         init_qp_attr->cap.max_recv_wr = IBLND_RECV_WRS(conn);
 922
 923         rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd, init_qp_attr);
 924         if (rc) {
 925                 CERROR("Can't create QP: %d, send_wr: %d, recv_wr: %d, "
 926                        "send_sge: %d, recv_sge: %d\n",
 927                        rc, init_qp_attr->cap.max_send_wr,
 928                        init_qp_attr->cap.max_recv_wr,
 929                        init_qp_attr->cap.max_send_sge,
 930                        init_qp_attr->cap.max_recv_sge);
 931                 goto failed_2;
 932         }
 933
 934         conn->ibc_sched = sched;
 935
 936         if (conn->ibc_queue_depth != peer_ni->ibp_queue_depth)
 937                 CWARN("peer %s - queue depth reduced from %u to %u"
 938                       "  to allow for qp creation\n",
 939                       libcfs_nid2str(peer_ni->ibp_nid),
 940                       peer_ni->ibp_queue_depth,
 941                       conn->ibc_queue_depth);
 942
 943         LIBCFS_CPT_ALLOC(conn->ibc_rxs, lnet_cpt_table(), cpt,
 944                          IBLND_RX_MSGS(conn) * sizeof(struct kib_rx));
 945         if (conn->ibc_rxs == NULL) {
 946                 CERROR("Cannot allocate RX buffers\n");
 947                 goto failed_2;
 948         }
 949
 950         rc = kiblnd_alloc_pages(&conn->ibc_rx_pages, cpt,
 951                                 IBLND_RX_MSG_PAGES(conn));
 952         if (rc != 0)
 953                 goto failed_2;
 954
 955         kiblnd_map_rx_descs(conn);
 956
 957         LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
 958
 959         /* 1 ref for caller and each rxmsg */
 960         atomic_set(&conn->ibc_refcount, 1 + IBLND_RX_MSGS(conn));
 961         conn->ibc_nrx = IBLND_RX_MSGS(conn);
 962
 963         /* post receives */
 964         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
 965                 rc = kiblnd_post_rx(&conn->ibc_rxs[i], IBLND_POSTRX_NO_CREDIT);
 966                 if (rc != 0) {
 967                         CERROR("Can't post rxmsg: %d\n", rc);
 968
 969                         /* Make posted receives complete */
 970                         kiblnd_abort_receives(conn);
 971
 972                         /* correct # of posted buffers
 973                          * NB locking needed now I'm racing with completion */
 974                         spin_lock_irqsave(&sched->ibs_lock, flags);
 975                         conn->ibc_nrx -= IBLND_RX_MSGS(conn) - i;
 976                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
 977
 978                         /* cmid will be destroyed by CM(ofed) after cm_callback
 979                          * returned, so we can't refer it anymore
 980                          * (by kiblnd_connd()->kiblnd_destroy_conn) */
 981                         rdma_destroy_qp(conn->ibc_cmid);
 982                         conn->ibc_cmid = NULL;
 983
 984                         /* Drop my own and unused rxbuffer refcounts */
 985                         while (i++ <= IBLND_RX_MSGS(conn))
 986                                 kiblnd_conn_decref(conn);
 987
 988                         return NULL;
 989                 }
 990         }
 991
 992         /* Init successful! */
 993         LASSERT (state == IBLND_CONN_ACTIVE_CONNECT ||
 994                  state == IBLND_CONN_PASSIVE_WAIT);
 995         conn->ibc_state = state;
 996
 997         /* 1 more conn */
 998         atomic_inc(&net->ibn_nconns);
 999         return conn;
1000
1001  failed_2:
1002         kiblnd_destroy_conn(conn);
1003         LIBCFS_FREE(conn, sizeof(*conn));
1004  failed_1:
1005         LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
1006  failed_0:
1007         return NULL;
1008 }
1009
1010 void
1011 kiblnd_destroy_conn(struct kib_conn *conn)
1012 {
1013         struct rdma_cm_id *cmid = conn->ibc_cmid;
1014         struct kib_peer_ni *peer_ni = conn->ibc_peer;
1015
1016         LASSERT (!in_interrupt());
1017         LASSERT (atomic_read(&conn->ibc_refcount) == 0);
1018         LASSERT(list_empty(&conn->ibc_early_rxs));
1019         LASSERT(list_empty(&conn->ibc_tx_noops));
1020         LASSERT(list_empty(&conn->ibc_tx_queue));
1021         LASSERT(list_empty(&conn->ibc_tx_queue_rsrvd));
1022         LASSERT(list_empty(&conn->ibc_tx_queue_nocred));
1023         LASSERT(list_empty(&conn->ibc_active_txs));
1024         LASSERT (conn->ibc_noops_posted == 0);
1025         LASSERT (conn->ibc_nsends_posted == 0);
1026
1027         switch (conn->ibc_state) {
1028         default:
1029                 /* conn must be completely disengaged from the network */
1030                 LBUG();
1031
1032         case IBLND_CONN_DISCONNECTED:
1033                 /* connvars should have been freed already */
1034                 LASSERT (conn->ibc_connvars == NULL);
1035                 break;
1036
1037         case IBLND_CONN_INIT:
1038                 break;
1039         }
1040
1041         /* conn->ibc_cmid might be destroyed by CM already */
1042         if (cmid != NULL && cmid->qp != NULL)
1043                 rdma_destroy_qp(cmid);
1044
1045         if (conn->ibc_cq)
1046                 ib_destroy_cq(conn->ibc_cq);
1047
1048         kiblnd_txlist_done(&conn->ibc_zombie_txs, -ECONNABORTED,
1049                            LNET_MSG_STATUS_OK);
1050
1051         if (conn->ibc_rx_pages != NULL)
1052                 kiblnd_unmap_rx_descs(conn);
1053
1054         if (conn->ibc_rxs != NULL)
1055                 CFS_FREE_PTR_ARRAY(conn->ibc_rxs, IBLND_RX_MSGS(conn));
1056
1057         if (conn->ibc_connvars != NULL)
1058                 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
1059
1060         if (conn->ibc_hdev != NULL)
1061                 kiblnd_hdev_decref(conn->ibc_hdev);
1062
1063         /* See CAVEAT EMPTOR above in kiblnd_create_conn */
1064         if (conn->ibc_state != IBLND_CONN_INIT) {
1065                 struct kib_net *net = peer_ni->ibp_ni->ni_data;
1066
1067                 kiblnd_peer_decref(peer_ni);
1068                 rdma_destroy_id(cmid);
1069                 atomic_dec(&net->ibn_nconns);
1070         }
1071 }
1072
1073 int
1074 kiblnd_close_peer_conns_locked(struct kib_peer_ni *peer_ni, int why)
1075 {
1076         struct kib_conn *conn;
1077         struct list_head        *ctmp;
1078         struct list_head        *cnxt;
1079         int                     count = 0;
1080
1081         list_for_each_safe(ctmp, cnxt, &peer_ni->ibp_conns) {
1082                 conn = list_entry(ctmp, struct kib_conn, ibc_list);
1083
1084                 CDEBUG(D_NET, "Closing conn -> %s, "
1085                               "version: %x, reason: %d\n",
1086                        libcfs_nid2str(peer_ni->ibp_nid),
1087                        conn->ibc_version, why);
1088
1089                 kiblnd_close_conn_locked(conn, why);
1090                 count++;
1091         }
1092
1093         return count;
1094 }
1095
1096 int
1097 kiblnd_close_stale_conns_locked(struct kib_peer_ni *peer_ni,
1098                                 int version, __u64 incarnation)
1099 {
1100         struct kib_conn *conn;
1101         struct list_head        *ctmp;
1102         struct list_head        *cnxt;
1103         int                     count = 0;
1104
1105         list_for_each_safe(ctmp, cnxt, &peer_ni->ibp_conns) {
1106                 conn = list_entry(ctmp, struct kib_conn, ibc_list);
1107
1108                 if (conn->ibc_version     == version &&
1109                     conn->ibc_incarnation == incarnation)
1110                         continue;
1111
1112                 CDEBUG(D_NET, "Closing stale conn -> %s version: %x, "
1113                               "incarnation:%#llx(%x, %#llx)\n",
1114                        libcfs_nid2str(peer_ni->ibp_nid),
1115                        conn->ibc_version, conn->ibc_incarnation,
1116                        version, incarnation);
1117
1118                 kiblnd_close_conn_locked(conn, -ESTALE);
1119                 count++;
1120         }
1121
1122         return count;
1123 }
1124
1125 static int
1126 kiblnd_close_matching_conns(struct lnet_ni *ni, lnet_nid_t nid)
1127 {
1128         struct kib_peer_ni              *peer_ni;
1129         struct list_head        *ptmp;
1130         struct list_head        *pnxt;
1131         int                     lo;
1132         int                     hi;
1133         int                     i;
1134         unsigned long           flags;
1135         int                     count = 0;
1136
1137         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1138
1139         if (nid != LNET_NID_ANY)
1140                 lo = hi = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
1141         else {
1142                 lo = 0;
1143                 hi = kiblnd_data.kib_peer_hash_size - 1;
1144         }
1145
1146         for (i = lo; i <= hi; i++) {
1147                 list_for_each_safe(ptmp, pnxt, &kiblnd_data.kib_peers[i]) {
1148
1149                         peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);
1150                         LASSERT(!kiblnd_peer_idle(peer_ni));
1151
1152                         if (peer_ni->ibp_ni != ni)
1153                                 continue;
1154
1155                         if (!(nid == LNET_NID_ANY || nid == peer_ni->ibp_nid))
1156                                 continue;
1157
1158                         count += kiblnd_close_peer_conns_locked(peer_ni, 0);
1159                 }
1160         }
1161
1162         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1163
1164         /* wildcards always succeed */
1165         if (nid == LNET_NID_ANY)
1166                 return 0;
1167
1168         return (count == 0) ? -ENOENT : 0;
1169 }
1170
1171 static int
1172 kiblnd_ctl(struct lnet_ni *ni, unsigned int cmd, void *arg)
1173 {
1174         struct libcfs_ioctl_data *data = arg;
1175         int                       rc = -EINVAL;
1176
1177         switch(cmd) {
1178         case IOC_LIBCFS_GET_PEER: {
1179                 lnet_nid_t   nid = 0;
1180                 int          count = 0;
1181
1182                 rc = kiblnd_get_peer_info(ni, data->ioc_count,
1183                                           &nid, &count);
1184                 data->ioc_nid    = nid;
1185                 data->ioc_count  = count;
1186                 break;
1187         }
1188
1189         case IOC_LIBCFS_DEL_PEER: {
1190                 rc = kiblnd_del_peer(ni, data->ioc_nid);
1191                 break;
1192         }
1193         case IOC_LIBCFS_GET_CONN: {
1194                 struct kib_conn *conn;
1195
1196                 rc = 0;
1197                 conn = kiblnd_get_conn_by_idx(ni, data->ioc_count);
1198                 if (conn == NULL) {
1199                         rc = -ENOENT;
1200                         break;
1201                 }
1202
1203                 LASSERT(conn->ibc_cmid != NULL);
1204                 data->ioc_nid = conn->ibc_peer->ibp_nid;
1205                 if (conn->ibc_cmid->route.path_rec == NULL)
1206                         data->ioc_u32[0] = 0; /* iWarp has no path MTU */
1207                 else
1208                         data->ioc_u32[0] =
1209                         ib_mtu_enum_to_int(conn->ibc_cmid->route.path_rec->mtu);
1210                 kiblnd_conn_decref(conn);
1211                 break;
1212         }
1213         case IOC_LIBCFS_CLOSE_CONNECTION: {
1214                 rc = kiblnd_close_matching_conns(ni, data->ioc_nid);
1215                 break;
1216         }
1217
1218         default:
1219                 break;
1220         }
1221
1222         return rc;
1223 }
1224
1225 static void
1226 kiblnd_free_pages(struct kib_pages *p)
1227 {
1228         int     npages = p->ibp_npages;
1229         int     i;
1230
1231         for (i = 0; i < npages; i++) {
1232                 if (p->ibp_pages[i] != NULL)
1233                         __free_page(p->ibp_pages[i]);
1234         }
1235
1236         LIBCFS_FREE(p, offsetof(struct kib_pages, ibp_pages[npages]));
1237 }
1238
1239 int
1240 kiblnd_alloc_pages(struct kib_pages **pp, int cpt, int npages)
1241 {
1242         struct kib_pages *p;
1243         int i;
1244
1245         LIBCFS_CPT_ALLOC(p, lnet_cpt_table(), cpt,
1246                          offsetof(struct kib_pages, ibp_pages[npages]));
1247         if (p == NULL) {
1248                 CERROR("Can't allocate descriptor for %d pages\n", npages);
1249                 return -ENOMEM;
1250         }
1251
1252         memset(p, 0, offsetof(struct kib_pages, ibp_pages[npages]));
1253         p->ibp_npages = npages;
1254
1255         for (i = 0; i < npages; i++) {
1256                 p->ibp_pages[i] = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1257                                                      GFP_NOFS);
1258                 if (p->ibp_pages[i] == NULL) {
1259                         CERROR("Can't allocate page %d of %d\n", i, npages);
1260                         kiblnd_free_pages(p);
1261                         return -ENOMEM;
1262                 }
1263         }
1264
1265         *pp = p;
1266         return 0;
1267 }
1268
1269 void
1270 kiblnd_unmap_rx_descs(struct kib_conn *conn)
1271 {
1272         struct kib_rx *rx;
1273         int       i;
1274
1275         LASSERT (conn->ibc_rxs != NULL);
1276         LASSERT (conn->ibc_hdev != NULL);
1277
1278         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
1279                 rx = &conn->ibc_rxs[i];
1280
1281                 LASSERT(rx->rx_nob >= 0); /* not posted */
1282
1283                 kiblnd_dma_unmap_single(conn->ibc_hdev->ibh_ibdev,
1284                                         KIBLND_UNMAP_ADDR(rx, rx_msgunmap,
1285                                                           rx->rx_msgaddr),
1286                                         IBLND_MSG_SIZE, DMA_FROM_DEVICE);
1287         }
1288
1289         kiblnd_free_pages(conn->ibc_rx_pages);
1290
1291         conn->ibc_rx_pages = NULL;
1292 }
1293
1294 void
1295 kiblnd_map_rx_descs(struct kib_conn *conn)
1296 {
1297         struct kib_rx *rx;
1298         struct page    *pg;
1299         int             pg_off;
1300         int             ipg;
1301         int             i;
1302
1303         for (pg_off = ipg = i = 0; i < IBLND_RX_MSGS(conn); i++) {
1304                 pg = conn->ibc_rx_pages->ibp_pages[ipg];
1305                 rx = &conn->ibc_rxs[i];
1306
1307                 rx->rx_conn = conn;
1308                 rx->rx_msg = (struct kib_msg *)(((char *)page_address(pg)) + pg_off);
1309
1310                 rx->rx_msgaddr =
1311                         kiblnd_dma_map_single(conn->ibc_hdev->ibh_ibdev,
1312                                               rx->rx_msg, IBLND_MSG_SIZE,
1313                                               DMA_FROM_DEVICE);
1314                 LASSERT(!kiblnd_dma_mapping_error(conn->ibc_hdev->ibh_ibdev,
1315                                                   rx->rx_msgaddr));
1316                 KIBLND_UNMAP_ADDR_SET(rx, rx_msgunmap, rx->rx_msgaddr);
1317
1318                 CDEBUG(D_NET, "rx %d: %p %#llx(%#llx)\n",
1319                        i, rx->rx_msg, rx->rx_msgaddr,
1320                        (__u64)(page_to_phys(pg) + pg_off));
1321
1322                 pg_off += IBLND_MSG_SIZE;
1323                 LASSERT(pg_off <= PAGE_SIZE);
1324
1325                 if (pg_off == PAGE_SIZE) {
1326                         pg_off = 0;
1327                         ipg++;
1328                         LASSERT(ipg <= IBLND_RX_MSG_PAGES(conn));
1329                 }
1330         }
1331 }
1332
1333 static void
1334 kiblnd_unmap_tx_pool(struct kib_tx_pool *tpo)
1335 {
1336         struct kib_hca_dev *hdev = tpo->tpo_hdev;
1337         struct kib_tx *tx;
1338         int i;
1339
1340         LASSERT (tpo->tpo_pool.po_allocated == 0);
1341
1342         if (hdev == NULL)
1343                 return;
1344
1345         for (i = 0; i < tpo->tpo_pool.po_size; i++) {
1346                 tx = &tpo->tpo_tx_descs[i];
1347                 kiblnd_dma_unmap_single(hdev->ibh_ibdev,
1348                                         KIBLND_UNMAP_ADDR(tx, tx_msgunmap,
1349                                                           tx->tx_msgaddr),
1350                                         IBLND_MSG_SIZE, DMA_TO_DEVICE);
1351         }
1352
1353         kiblnd_hdev_decref(hdev);
1354         tpo->tpo_hdev = NULL;
1355 }
1356
1357 static struct kib_hca_dev *
1358 kiblnd_current_hdev(struct kib_dev *dev)
1359 {
1360         struct kib_hca_dev *hdev;
1361         unsigned long  flags;
1362         int            i = 0;
1363
1364         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1365         while (dev->ibd_failover) {
1366                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1367                 if (i++ % 50 == 0)
1368                         CDEBUG(D_NET, "%s: Wait for failover\n",
1369                                dev->ibd_ifname);
1370                 schedule_timeout_interruptible(cfs_time_seconds(1) / 100);
1371
1372                 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1373         }
1374
1375         kiblnd_hdev_addref_locked(dev->ibd_hdev);
1376         hdev = dev->ibd_hdev;
1377
1378         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1379
1380         return hdev;
1381 }
1382
1383 static void
1384 kiblnd_map_tx_pool(struct kib_tx_pool *tpo)
1385 {
1386         struct kib_pages *txpgs = tpo->tpo_tx_pages;
1387         struct kib_pool *pool = &tpo->tpo_pool;
1388         struct kib_net      *net   = pool->po_owner->ps_net;
1389         struct kib_dev *dev;
1390         struct page *page;
1391         struct kib_tx *tx;
1392         int             page_offset;
1393         int             ipage;
1394         int             i;
1395
1396         LASSERT (net != NULL);
1397
1398         dev = net->ibn_dev;
1399
1400         /* pre-mapped messages are not bigger than 1 page */
1401         BUILD_BUG_ON(IBLND_MSG_SIZE > PAGE_SIZE);
1402
1403         /* No fancy arithmetic when we do the buffer calculations */
1404         BUILD_BUG_ON(PAGE_SIZE % IBLND_MSG_SIZE != 0);
1405
1406         tpo->tpo_hdev = kiblnd_current_hdev(dev);
1407
1408         for (ipage = page_offset = i = 0; i < pool->po_size; i++) {
1409                 page = txpgs->ibp_pages[ipage];
1410                 tx = &tpo->tpo_tx_descs[i];
1411
1412                 tx->tx_msg = (struct kib_msg *)(((char *)page_address(page)) +
1413                                                 page_offset);
1414
1415                 tx->tx_msgaddr = kiblnd_dma_map_single(tpo->tpo_hdev->ibh_ibdev,
1416                                                        tx->tx_msg,
1417                                                        IBLND_MSG_SIZE,
1418                                                        DMA_TO_DEVICE);
1419                 LASSERT(!kiblnd_dma_mapping_error(tpo->tpo_hdev->ibh_ibdev,
1420                                                   tx->tx_msgaddr));
1421                 KIBLND_UNMAP_ADDR_SET(tx, tx_msgunmap, tx->tx_msgaddr);
1422
1423                 list_add(&tx->tx_list, &pool->po_free_list);
1424
1425                 page_offset += IBLND_MSG_SIZE;
1426                 LASSERT(page_offset <= PAGE_SIZE);
1427
1428                 if (page_offset == PAGE_SIZE) {
1429                         page_offset = 0;
1430                         ipage++;
1431                         LASSERT(ipage <= txpgs->ibp_npages);
1432                 }
1433         }
1434 }
1435
1436 static void
1437 kiblnd_destroy_fmr_pool(struct kib_fmr_pool *fpo)
1438 {
1439         LASSERT(fpo->fpo_map_count == 0);
1440
1441         if (fpo->fpo_is_fmr && fpo->fmr.fpo_fmr_pool) {
1442                 ib_destroy_fmr_pool(fpo->fmr.fpo_fmr_pool);
1443         } else {
1444                 struct kib_fast_reg_descriptor *frd, *tmp;
1445                 int i = 0;
1446
1447                 list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1448                                          frd_list) {
1449                         list_del(&frd->frd_list);
1450 #ifndef HAVE_IB_MAP_MR_SG
1451                         ib_free_fast_reg_page_list(frd->frd_frpl);
1452 #endif
1453                         ib_dereg_mr(frd->frd_mr);
1454                         LIBCFS_FREE(frd, sizeof(*frd));
1455                         i++;
1456                 }
1457                 if (i < fpo->fast_reg.fpo_pool_size)
1458                         CERROR("FastReg pool still has %d regions registered\n",
1459                                 fpo->fast_reg.fpo_pool_size - i);
1460         }
1461
1462         if (fpo->fpo_hdev)
1463                 kiblnd_hdev_decref(fpo->fpo_hdev);
1464
1465         LIBCFS_FREE(fpo, sizeof(*fpo));
1466 }
1467
1468 static void
1469 kiblnd_destroy_fmr_pool_list(struct list_head *head)
1470 {
1471         struct kib_fmr_pool *fpo, *tmp;
1472
1473         list_for_each_entry_safe(fpo, tmp, head, fpo_list) {
1474                 list_del(&fpo->fpo_list);
1475                 kiblnd_destroy_fmr_pool(fpo);
1476         }
1477 }
1478
1479 static int
1480 kiblnd_fmr_pool_size(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1481                      int ncpts)
1482 {
1483         int size = tunables->lnd_fmr_pool_size / ncpts;
1484
1485         return max(IBLND_FMR_POOL, size);
1486 }
1487
1488 static int
1489 kiblnd_fmr_flush_trigger(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1490                          int ncpts)
1491 {
1492         int size = tunables->lnd_fmr_flush_trigger / ncpts;
1493
1494         return max(IBLND_FMR_POOL_FLUSH, size);
1495 }
1496
1497 static int kiblnd_alloc_fmr_pool(struct kib_fmr_poolset *fps,
1498                                  struct kib_fmr_pool *fpo)
1499 {
1500         struct ib_fmr_pool_param param = {
1501                 .max_pages_per_fmr = LNET_MAX_IOV,
1502                 .page_shift        = PAGE_SHIFT,
1503                 .access            = (IB_ACCESS_LOCAL_WRITE |
1504                                       IB_ACCESS_REMOTE_WRITE),
1505                 .pool_size         = fps->fps_pool_size,
1506                 .dirty_watermark   = fps->fps_flush_trigger,
1507                 .flush_function    = NULL,
1508                 .flush_arg         = NULL,
1509                 .cache             = !!fps->fps_cache };
1510         int rc = 0;
1511
1512         fpo->fmr.fpo_fmr_pool = ib_create_fmr_pool(fpo->fpo_hdev->ibh_pd,
1513                                                    &param);
1514         if (IS_ERR(fpo->fmr.fpo_fmr_pool)) {
1515                 rc = PTR_ERR(fpo->fmr.fpo_fmr_pool);
1516                 if (rc != -ENOSYS)
1517                         CERROR("Failed to create FMR pool: %d\n", rc);
1518                 else
1519                         CERROR("FMRs are not supported\n");
1520         }
1521         fpo->fpo_is_fmr = true;
1522
1523         return rc;
1524 }
1525
1526 static int kiblnd_alloc_freg_pool(struct kib_fmr_poolset *fps,
1527                                   struct kib_fmr_pool *fpo,
1528                                   enum kib_dev_caps dev_caps)
1529 {
1530         struct kib_fast_reg_descriptor *frd, *tmp;
1531         int i, rc;
1532
1533         fpo->fpo_is_fmr = false;
1534
1535         INIT_LIST_HEAD(&fpo->fast_reg.fpo_pool_list);
1536         fpo->fast_reg.fpo_pool_size = 0;
1537         for (i = 0; i < fps->fps_pool_size; i++) {
1538                 LIBCFS_CPT_ALLOC(frd, lnet_cpt_table(), fps->fps_cpt,
1539                                  sizeof(*frd));
1540                 if (!frd) {
1541                         CERROR("Failed to allocate a new fast_reg descriptor\n");
1542                         rc = -ENOMEM;
1543                         goto out;
1544                 }
1545                 frd->frd_mr = NULL;
1546
1547 #ifndef HAVE_IB_MAP_MR_SG
1548                 frd->frd_frpl = ib_alloc_fast_reg_page_list(fpo->fpo_hdev->ibh_ibdev,
1549                                                             LNET_MAX_IOV);
1550                 if (IS_ERR(frd->frd_frpl)) {
1551                         rc = PTR_ERR(frd->frd_frpl);
1552                         CERROR("Failed to allocate ib_fast_reg_page_list: %d\n",
1553                                 rc);
1554                         frd->frd_frpl = NULL;
1555                         goto out_middle;
1556                 }
1557 #endif
1558
1559 #ifdef HAVE_IB_ALLOC_FAST_REG_MR
1560                 frd->frd_mr = ib_alloc_fast_reg_mr(fpo->fpo_hdev->ibh_pd,
1561                                                    LNET_MAX_IOV);
1562 #else
1563                 /*
1564                  * it is expected to get here if this is an MLX-5 card.
1565                  * MLX-4 cards will always use FMR and MLX-5 cards will
1566                  * always use fast_reg. It turns out that some MLX-5 cards
1567                  * (possibly due to older FW versions) do not natively support
1568                  * gaps. So we will need to track them here.
1569                  */
1570                 frd->frd_mr = ib_alloc_mr(fpo->fpo_hdev->ibh_pd,
1571 #ifdef IB_MR_TYPE_SG_GAPS
1572                                           ((*kiblnd_tunables.kib_use_fastreg_gaps == 1) &&
1573                                            (dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT)) ?
1574                                                 IB_MR_TYPE_SG_GAPS :
1575                                                 IB_MR_TYPE_MEM_REG,
1576 #else
1577                                                 IB_MR_TYPE_MEM_REG,
1578 #endif
1579                                           LNET_MAX_IOV);
1580                 if ((*kiblnd_tunables.kib_use_fastreg_gaps == 1) &&
1581                     (dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT))
1582                         CWARN("using IB_MR_TYPE_SG_GAPS, expect a performance drop\n");
1583 #endif
1584                 if (IS_ERR(frd->frd_mr)) {
1585                         rc = PTR_ERR(frd->frd_mr);
1586                         CERROR("Failed to allocate ib_fast_reg_mr: %d\n", rc);
1587                         frd->frd_mr = NULL;
1588                         goto out_middle;
1589                 }
1590
1591                 /* There appears to be a bug in MLX5 code where you must
1592                  * invalidate the rkey of a new FastReg pool before first
1593                  * using it. Thus, I am marking the FRD invalid here. */
1594                 frd->frd_valid = false;
1595
1596                 list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1597                 fpo->fast_reg.fpo_pool_size++;
1598         }
1599
1600         return 0;
1601
1602 out_middle:
1603         if (frd->frd_mr)
1604                 ib_dereg_mr(frd->frd_mr);
1605 #ifndef HAVE_IB_MAP_MR_SG
1606         if (frd->frd_frpl)
1607                 ib_free_fast_reg_page_list(frd->frd_frpl);
1608 #endif
1609         LIBCFS_FREE(frd, sizeof(*frd));
1610
1611 out:
1612         list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1613                                  frd_list) {
1614                 list_del(&frd->frd_list);
1615 #ifndef HAVE_IB_MAP_MR_SG
1616                 ib_free_fast_reg_page_list(frd->frd_frpl);
1617 #endif
1618                 ib_dereg_mr(frd->frd_mr);
1619                 LIBCFS_FREE(frd, sizeof(*frd));
1620         }
1621
1622         return rc;
1623 }
1624
1625 static int kiblnd_create_fmr_pool(struct kib_fmr_poolset *fps,
1626                                   struct kib_fmr_pool **pp_fpo)
1627 {
1628         struct kib_dev *dev = fps->fps_net->ibn_dev;
1629         struct kib_fmr_pool *fpo;
1630         int rc;
1631
1632         LIBCFS_CPT_ALLOC(fpo, lnet_cpt_table(), fps->fps_cpt, sizeof(*fpo));
1633         if (!fpo) {
1634                 return -ENOMEM;
1635         }
1636         memset(fpo, 0, sizeof(*fpo));
1637
1638         fpo->fpo_hdev = kiblnd_current_hdev(dev);
1639
1640         if (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)
1641                 rc = kiblnd_alloc_fmr_pool(fps, fpo);
1642         else
1643                 rc = kiblnd_alloc_freg_pool(fps, fpo, dev->ibd_dev_caps);
1644         if (rc)
1645                 goto out_fpo;
1646
1647         fpo->fpo_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
1648         fpo->fpo_owner = fps;
1649         *pp_fpo = fpo;
1650
1651         return 0;
1652
1653 out_fpo:
1654         kiblnd_hdev_decref(fpo->fpo_hdev);
1655         LIBCFS_FREE(fpo, sizeof(*fpo));
1656         return rc;
1657 }
1658
1659 static void
1660 kiblnd_fail_fmr_poolset(struct kib_fmr_poolset *fps, struct list_head *zombies)
1661 {
1662         if (fps->fps_net == NULL) /* intialized? */
1663                 return;
1664
1665         spin_lock(&fps->fps_lock);
1666
1667         while (!list_empty(&fps->fps_pool_list)) {
1668                 struct kib_fmr_pool *fpo = list_entry(fps->fps_pool_list.next,
1669                                                       struct kib_fmr_pool,
1670                                                       fpo_list);
1671
1672                 fpo->fpo_failed = 1;
1673                 if (fpo->fpo_map_count == 0)
1674                         list_move(&fpo->fpo_list, zombies);
1675                 else
1676                         list_move(&fpo->fpo_list, &fps->fps_failed_pool_list);
1677         }
1678
1679         spin_unlock(&fps->fps_lock);
1680 }
1681
1682 static void
1683 kiblnd_fini_fmr_poolset(struct kib_fmr_poolset *fps)
1684 {
1685         if (fps->fps_net != NULL) { /* initialized? */
1686                 kiblnd_destroy_fmr_pool_list(&fps->fps_failed_pool_list);
1687                 kiblnd_destroy_fmr_pool_list(&fps->fps_pool_list);
1688         }
1689 }
1690
1691 static int
1692 kiblnd_init_fmr_poolset(struct kib_fmr_poolset *fps, int cpt, int ncpts,
1693                         struct kib_net *net,
1694                         struct lnet_ioctl_config_o2iblnd_tunables *tunables)
1695 {
1696         struct kib_fmr_pool *fpo;
1697         int rc;
1698
1699         memset(fps, 0, sizeof(struct kib_fmr_poolset));
1700
1701         fps->fps_net = net;
1702         fps->fps_cpt = cpt;
1703
1704         fps->fps_pool_size = kiblnd_fmr_pool_size(tunables, ncpts);
1705         fps->fps_flush_trigger = kiblnd_fmr_flush_trigger(tunables, ncpts);
1706         fps->fps_cache = tunables->lnd_fmr_cache;
1707
1708         spin_lock_init(&fps->fps_lock);
1709         INIT_LIST_HEAD(&fps->fps_pool_list);
1710         INIT_LIST_HEAD(&fps->fps_failed_pool_list);
1711
1712         rc = kiblnd_create_fmr_pool(fps, &fpo);
1713         if (rc == 0)
1714                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1715
1716         return rc;
1717 }
1718
1719 static int
1720 kiblnd_fmr_pool_is_idle(struct kib_fmr_pool *fpo, time64_t now)
1721 {
1722         if (fpo->fpo_map_count != 0) /* still in use */
1723                 return 0;
1724         if (fpo->fpo_failed)
1725                 return 1;
1726         return now >= fpo->fpo_deadline;
1727 }
1728
1729 static int
1730 kiblnd_map_tx_pages(struct kib_tx *tx, struct kib_rdma_desc *rd)
1731 {
1732         struct kib_hca_dev *hdev;
1733         __u64           *pages = tx->tx_pages;
1734         int             npages;
1735         int             size;
1736         int             i;
1737
1738         hdev = tx->tx_pool->tpo_hdev;
1739
1740         for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
1741                 for (size = 0; size <  rd->rd_frags[i].rf_nob;
1742                         size += hdev->ibh_page_size) {
1743                         pages[npages++] = (rd->rd_frags[i].rf_addr &
1744                                            hdev->ibh_page_mask) + size;
1745                 }
1746         }
1747
1748         return npages;
1749 }
1750
1751 void
1752 kiblnd_fmr_pool_unmap(struct kib_fmr *fmr, int status)
1753 {
1754         LIST_HEAD(zombies);
1755         struct kib_fmr_pool *fpo = fmr->fmr_pool;
1756         struct kib_fmr_poolset *fps;
1757         time64_t now = ktime_get_seconds();
1758         struct kib_fmr_pool *tmp;
1759         int rc;
1760
1761         if (!fpo)
1762                 return;
1763
1764         fps = fpo->fpo_owner;
1765         if (fpo->fpo_is_fmr) {
1766                 if (fmr->fmr_pfmr) {
1767                         ib_fmr_pool_unmap(fmr->fmr_pfmr);
1768                         fmr->fmr_pfmr = NULL;
1769                 }
1770
1771                 if (status) {
1772                         rc = ib_flush_fmr_pool(fpo->fmr.fpo_fmr_pool);
1773                         LASSERT(!rc);
1774                 }
1775         } else {
1776                 struct kib_fast_reg_descriptor *frd = fmr->fmr_frd;
1777
1778                 if (frd) {
1779                         frd->frd_valid = false;
1780                         spin_lock(&fps->fps_lock);
1781                         list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1782                         spin_unlock(&fps->fps_lock);
1783                         fmr->fmr_frd = NULL;
1784                 }
1785         }
1786         fmr->fmr_pool = NULL;
1787
1788         spin_lock(&fps->fps_lock);
1789         fpo->fpo_map_count--;   /* decref the pool */
1790
1791         list_for_each_entry_safe(fpo, tmp, &fps->fps_pool_list, fpo_list) {
1792                 /* the first pool is persistent */
1793                 if (fps->fps_pool_list.next == &fpo->fpo_list)
1794                         continue;
1795
1796                 if (kiblnd_fmr_pool_is_idle(fpo, now)) {
1797                         list_move(&fpo->fpo_list, &zombies);
1798                         fps->fps_version++;
1799                 }
1800         }
1801         spin_unlock(&fps->fps_lock);
1802
1803         if (!list_empty(&zombies))
1804                 kiblnd_destroy_fmr_pool_list(&zombies);
1805 }
1806
1807 int kiblnd_fmr_pool_map(struct kib_fmr_poolset *fps, struct kib_tx *tx,
1808                         struct kib_rdma_desc *rd, u32 nob, u64 iov,
1809                         struct kib_fmr *fmr)
1810 {
1811         struct kib_fmr_pool *fpo;
1812         __u64 *pages = tx->tx_pages;
1813         __u64 version;
1814         bool is_rx = (rd != tx->tx_rd);
1815         bool tx_pages_mapped = 0;
1816         int npages = 0;
1817         int rc;
1818
1819 again:
1820         spin_lock(&fps->fps_lock);
1821         version = fps->fps_version;
1822         list_for_each_entry(fpo, &fps->fps_pool_list, fpo_list) {
1823                 fpo->fpo_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
1824                 fpo->fpo_map_count++;
1825
1826                 if (fpo->fpo_is_fmr) {
1827                         struct ib_pool_fmr *pfmr;
1828
1829                         spin_unlock(&fps->fps_lock);
1830
1831                         if (!tx_pages_mapped) {
1832                                 npages = kiblnd_map_tx_pages(tx, rd);
1833                                 tx_pages_mapped = 1;
1834                         }
1835
1836                         pfmr = kib_fmr_pool_map(fpo->fmr.fpo_fmr_pool,
1837                                                 pages, npages, iov);
1838                         if (likely(!IS_ERR(pfmr))) {
1839                                 fmr->fmr_key  = is_rx ? pfmr->fmr->rkey
1840                                                       : pfmr->fmr->lkey;
1841                                 fmr->fmr_frd  = NULL;
1842                                 fmr->fmr_pfmr = pfmr;
1843                                 fmr->fmr_pool = fpo;
1844                                 return 0;
1845                         }
1846                         rc = PTR_ERR(pfmr);
1847                 } else {
1848                         if (!list_empty(&fpo->fast_reg.fpo_pool_list)) {
1849                                 struct kib_fast_reg_descriptor *frd;
1850 #ifdef HAVE_IB_MAP_MR_SG
1851                                 struct ib_reg_wr *wr;
1852                                 int n;
1853 #else
1854                                 struct ib_rdma_wr *wr;
1855                                 struct ib_fast_reg_page_list *frpl;
1856 #endif
1857                                 struct ib_mr *mr;
1858
1859                                 frd = list_first_entry(&fpo->fast_reg.fpo_pool_list,
1860                                                         struct kib_fast_reg_descriptor,
1861                                                         frd_list);
1862                                 list_del(&frd->frd_list);
1863                                 spin_unlock(&fps->fps_lock);
1864
1865 #ifndef HAVE_IB_MAP_MR_SG
1866                                 frpl = frd->frd_frpl;
1867 #endif
1868                                 mr   = frd->frd_mr;
1869
1870                                 if (!frd->frd_valid) {
1871                                         struct ib_rdma_wr *inv_wr;
1872                                         __u32 key = is_rx ? mr->rkey : mr->lkey;
1873
1874                                         inv_wr = &frd->frd_inv_wr;
1875                                         memset(inv_wr, 0, sizeof(*inv_wr));
1876
1877                                         inv_wr->wr.opcode = IB_WR_LOCAL_INV;
1878                                         inv_wr->wr.wr_id  = IBLND_WID_MR;
1879                                         inv_wr->wr.ex.invalidate_rkey = key;
1880
1881                                         /* Bump the key */
1882                                         key = ib_inc_rkey(key);
1883                                         ib_update_fast_reg_key(mr, key);
1884                                 }
1885
1886 #ifdef HAVE_IB_MAP_MR_SG
1887 #ifdef HAVE_IB_MAP_MR_SG_5ARGS
1888                                 n = ib_map_mr_sg(mr, tx->tx_frags,
1889                                                  tx->tx_nfrags, NULL, PAGE_SIZE);
1890 #else
1891                                 n = ib_map_mr_sg(mr, tx->tx_frags,
1892                                                  tx->tx_nfrags, PAGE_SIZE);
1893 #endif
1894                                 if (unlikely(n != tx->tx_nfrags)) {
1895                                         CERROR("Failed to map mr %d/%d "
1896                                                "elements\n", n, tx->tx_nfrags);
1897                                         return n < 0 ? n : -EINVAL;
1898                                 }
1899
1900                                 wr = &frd->frd_fastreg_wr;
1901                                 memset(wr, 0, sizeof(*wr));
1902
1903                                 wr->wr.opcode = IB_WR_REG_MR;
1904                                 wr->wr.wr_id  = IBLND_WID_MR;
1905                                 wr->wr.num_sge = 0;
1906                                 wr->wr.send_flags = 0;
1907                                 wr->mr = mr;
1908                                 wr->key = is_rx ? mr->rkey : mr->lkey;
1909                                 wr->access = (IB_ACCESS_LOCAL_WRITE |
1910                                               IB_ACCESS_REMOTE_WRITE);
1911 #else
1912                                 if (!tx_pages_mapped) {
1913                                         npages = kiblnd_map_tx_pages(tx, rd);
1914                                         tx_pages_mapped = 1;
1915                                 }
1916
1917                                 LASSERT(npages <= frpl->max_page_list_len);
1918                                 memcpy(frpl->page_list, pages,
1919                                         sizeof(*pages) * npages);
1920
1921                                 /* Prepare FastReg WR */
1922                                 wr = &frd->frd_fastreg_wr;
1923                                 memset(wr, 0, sizeof(*wr));
1924
1925                                 wr->wr.opcode = IB_WR_FAST_REG_MR;
1926                                 wr->wr.wr_id  = IBLND_WID_MR;
1927
1928                                 wr->wr.wr.fast_reg.iova_start = iov;
1929                                 wr->wr.wr.fast_reg.page_list  = frpl;
1930                                 wr->wr.wr.fast_reg.page_list_len = npages;
1931                                 wr->wr.wr.fast_reg.page_shift = PAGE_SHIFT;
1932                                 wr->wr.wr.fast_reg.length = nob;
1933                                 wr->wr.wr.fast_reg.rkey =
1934                                                 is_rx ? mr->rkey : mr->lkey;
1935                                 wr->wr.wr.fast_reg.access_flags =
1936                                                 (IB_ACCESS_LOCAL_WRITE |
1937                                                  IB_ACCESS_REMOTE_WRITE);
1938 #endif
1939
1940                                 fmr->fmr_key  = is_rx ? mr->rkey : mr->lkey;
1941                                 fmr->fmr_frd  = frd;
1942                                 fmr->fmr_pfmr = NULL;
1943                                 fmr->fmr_pool = fpo;
1944                                 return 0;
1945                         }
1946                         spin_unlock(&fps->fps_lock);
1947                         rc = -EAGAIN;
1948                 }
1949
1950                 spin_lock(&fps->fps_lock);
1951                 fpo->fpo_map_count--;
1952                 if (rc != -EAGAIN) {
1953                         spin_unlock(&fps->fps_lock);
1954                         return rc;
1955                 }
1956
1957                 /* EAGAIN and ... */
1958                 if (version != fps->fps_version) {
1959                         spin_unlock(&fps->fps_lock);
1960                         goto again;
1961                 }
1962         }
1963
1964         if (fps->fps_increasing) {
1965                 spin_unlock(&fps->fps_lock);
1966                 CDEBUG(D_NET, "Another thread is allocating new "
1967                        "FMR pool, waiting for her to complete\n");
1968                 schedule();
1969                 goto again;
1970
1971         }
1972
1973         if (ktime_get_seconds() < fps->fps_next_retry) {
1974                 /* someone failed recently */
1975                 spin_unlock(&fps->fps_lock);
1976                 return -EAGAIN;
1977         }
1978
1979         fps->fps_increasing = 1;
1980         spin_unlock(&fps->fps_lock);
1981
1982         CDEBUG(D_NET, "Allocate new FMR pool\n");
1983         rc = kiblnd_create_fmr_pool(fps, &fpo);
1984         spin_lock(&fps->fps_lock);
1985         fps->fps_increasing = 0;
1986         if (rc == 0) {
1987                 fps->fps_version++;
1988                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1989         } else {
1990                 fps->fps_next_retry = ktime_get_seconds() + IBLND_POOL_RETRY;
1991         }
1992         spin_unlock(&fps->fps_lock);
1993
1994         goto again;
1995 }
1996
1997 static void
1998 kiblnd_fini_pool(struct kib_pool *pool)
1999 {
2000         LASSERT(list_empty(&pool->po_free_list));
2001         LASSERT(pool->po_allocated == 0);
2002
2003         CDEBUG(D_NET, "Finalize %s pool\n", pool->po_owner->ps_name);
2004 }
2005
2006 static void
2007 kiblnd_init_pool(struct kib_poolset *ps, struct kib_pool *pool, int size)
2008 {
2009         CDEBUG(D_NET, "Initialize %s pool\n", ps->ps_name);
2010
2011         memset(pool, 0, sizeof(struct kib_pool));
2012         INIT_LIST_HEAD(&pool->po_free_list);
2013         pool->po_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
2014         pool->po_owner = ps;
2015         pool->po_size = size;
2016 }
2017
2018 static void
2019 kiblnd_destroy_pool_list(struct list_head *head)
2020 {
2021         struct kib_pool *pool;
2022
2023         while (!list_empty(head)) {
2024                 pool = list_entry(head->next, struct kib_pool, po_list);
2025                 list_del(&pool->po_list);
2026
2027                 LASSERT(pool->po_owner != NULL);
2028                 pool->po_owner->ps_pool_destroy(pool);
2029         }
2030 }
2031
2032 static void
2033 kiblnd_fail_poolset(struct kib_poolset *ps, struct list_head *zombies)
2034 {
2035         if (ps->ps_net == NULL) /* intialized? */
2036                 return;
2037
2038         spin_lock(&ps->ps_lock);
2039         while (!list_empty(&ps->ps_pool_list)) {
2040                 struct kib_pool *po = list_entry(ps->ps_pool_list.next,
2041                                                  struct kib_pool, po_list);
2042
2043                 po->po_failed = 1;
2044                 if (po->po_allocated == 0)
2045                         list_move(&po->po_list, zombies);
2046                 else
2047                         list_move(&po->po_list, &ps->ps_failed_pool_list);
2048         }
2049         spin_unlock(&ps->ps_lock);
2050 }
2051
2052 static void
2053 kiblnd_fini_poolset(struct kib_poolset *ps)
2054 {
2055         if (ps->ps_net != NULL) { /* initialized? */
2056                 kiblnd_destroy_pool_list(&ps->ps_failed_pool_list);
2057                 kiblnd_destroy_pool_list(&ps->ps_pool_list);
2058         }
2059 }
2060
2061 static int
2062 kiblnd_init_poolset(struct kib_poolset *ps, int cpt,
2063                     struct kib_net *net, char *name, int size,
2064                     kib_ps_pool_create_t po_create,
2065                     kib_ps_pool_destroy_t po_destroy,
2066                     kib_ps_node_init_t nd_init,
2067                     kib_ps_node_fini_t nd_fini)
2068 {
2069         struct kib_pool *pool;
2070         int rc;
2071
2072         memset(ps, 0, sizeof(struct kib_poolset));
2073
2074         ps->ps_cpt          = cpt;
2075         ps->ps_net          = net;
2076         ps->ps_pool_create  = po_create;
2077         ps->ps_pool_destroy = po_destroy;
2078         ps->ps_node_init    = nd_init;
2079         ps->ps_node_fini    = nd_fini;
2080         ps->ps_pool_size    = size;
2081         if (strlcpy(ps->ps_name, name, sizeof(ps->ps_name))
2082             >= sizeof(ps->ps_name))
2083                 return -E2BIG;
2084         spin_lock_init(&ps->ps_lock);
2085         INIT_LIST_HEAD(&ps->ps_pool_list);
2086         INIT_LIST_HEAD(&ps->ps_failed_pool_list);
2087
2088         rc = ps->ps_pool_create(ps, size, &pool);
2089         if (rc == 0)
2090                 list_add(&pool->po_list, &ps->ps_pool_list);
2091         else
2092                 CERROR("Failed to create the first pool for %s\n", ps->ps_name);
2093
2094         return rc;
2095 }
2096
2097 static int
2098 kiblnd_pool_is_idle(struct kib_pool *pool, time64_t now)
2099 {
2100         if (pool->po_allocated != 0) /* still in use */
2101                 return 0;
2102         if (pool->po_failed)
2103                 return 1;
2104         return now >= pool->po_deadline;
2105 }
2106
2107 void
2108 kiblnd_pool_free_node(struct kib_pool *pool, struct list_head *node)
2109 {
2110         LIST_HEAD(zombies);
2111         struct kib_poolset *ps = pool->po_owner;
2112         struct kib_pool *tmp;
2113         time64_t now = ktime_get_seconds();
2114
2115         spin_lock(&ps->ps_lock);
2116
2117         if (ps->ps_node_fini != NULL)
2118                 ps->ps_node_fini(pool, node);
2119
2120         LASSERT(pool->po_allocated > 0);
2121         list_add(node, &pool->po_free_list);
2122         pool->po_allocated--;
2123
2124         list_for_each_entry_safe(pool, tmp, &ps->ps_pool_list, po_list) {
2125                 /* the first pool is persistent */
2126                 if (ps->ps_pool_list.next == &pool->po_list)
2127                         continue;
2128
2129                 if (kiblnd_pool_is_idle(pool, now))
2130                         list_move(&pool->po_list, &zombies);
2131         }
2132         spin_unlock(&ps->ps_lock);
2133
2134         if (!list_empty(&zombies))
2135                 kiblnd_destroy_pool_list(&zombies);
2136 }
2137
2138 struct list_head *
2139 kiblnd_pool_alloc_node(struct kib_poolset *ps)
2140 {
2141         struct list_head        *node;
2142         struct kib_pool *pool;
2143         int                     rc;
2144         unsigned int            interval = 1;
2145         ktime_t time_before;
2146         unsigned int trips = 0;
2147
2148 again:
2149         spin_lock(&ps->ps_lock);
2150         list_for_each_entry(pool, &ps->ps_pool_list, po_list) {
2151                 if (list_empty(&pool->po_free_list))
2152                         continue;
2153
2154                 pool->po_allocated++;
2155                 pool->po_deadline = ktime_get_seconds() +
2156                                     IBLND_POOL_DEADLINE;
2157                 node = pool->po_free_list.next;
2158                 list_del(node);
2159
2160                 if (ps->ps_node_init != NULL) {
2161                         /* still hold the lock */
2162                         ps->ps_node_init(pool, node);
2163                 }
2164                 spin_unlock(&ps->ps_lock);
2165                 return node;
2166         }
2167
2168         /* no available tx pool and ... */
2169         if (ps->ps_increasing) {
2170                 /* another thread is allocating a new pool */
2171                 spin_unlock(&ps->ps_lock);
2172                 trips++;
2173                 CDEBUG(D_NET,
2174                        "Another thread is allocating new %s pool, waiting %d jiffies for her to complete. trips = %d\n",
2175                        ps->ps_name, interval, trips);
2176
2177                 schedule_timeout_interruptible(interval);
2178                 if (interval < cfs_time_seconds(1))
2179                         interval *= 2;
2180
2181                 goto again;
2182         }
2183
2184         if (ktime_get_seconds() < ps->ps_next_retry) {
2185                 /* someone failed recently */
2186                 spin_unlock(&ps->ps_lock);
2187                 return NULL;
2188         }
2189
2190         ps->ps_increasing = 1;
2191         spin_unlock(&ps->ps_lock);
2192
2193         CDEBUG(D_NET, "%s pool exhausted, allocate new pool\n", ps->ps_name);
2194         time_before = ktime_get();
2195         rc = ps->ps_pool_create(ps, ps->ps_pool_size, &pool);
2196         CDEBUG(D_NET, "ps_pool_create took %lld ms to complete",
2197                ktime_ms_delta(ktime_get(), time_before));
2198
2199         spin_lock(&ps->ps_lock);
2200         ps->ps_increasing = 0;
2201         if (rc == 0) {
2202                 list_add_tail(&pool->po_list, &ps->ps_pool_list);
2203         } else {
2204                 ps->ps_next_retry = ktime_get_seconds() + IBLND_POOL_RETRY;
2205                 CERROR("Can't allocate new %s pool because out of memory\n",
2206                        ps->ps_name);
2207         }
2208         spin_unlock(&ps->ps_lock);
2209
2210         goto again;
2211 }
2212
2213 static void
2214 kiblnd_destroy_tx_pool(struct kib_pool *pool)
2215 {
2216         struct kib_tx_pool *tpo = container_of(pool, struct kib_tx_pool,
2217                                                tpo_pool);
2218         int i;
2219
2220         LASSERT (pool->po_allocated == 0);
2221
2222         if (tpo->tpo_tx_pages != NULL) {
2223                 kiblnd_unmap_tx_pool(tpo);
2224                 kiblnd_free_pages(tpo->tpo_tx_pages);
2225         }
2226
2227         if (tpo->tpo_tx_descs == NULL)
2228                 goto out;
2229
2230         for (i = 0; i < pool->po_size; i++) {
2231                 struct kib_tx *tx = &tpo->tpo_tx_descs[i];
2232                 int       wrq_sge = *kiblnd_tunables.kib_wrq_sge;
2233
2234                 list_del(&tx->tx_list);
2235                 if (tx->tx_pages != NULL)
2236                         CFS_FREE_PTR_ARRAY(tx->tx_pages, LNET_MAX_IOV);
2237                 if (tx->tx_frags != NULL)
2238                         CFS_FREE_PTR_ARRAY(tx->tx_frags,
2239                                            (1 + IBLND_MAX_RDMA_FRAGS));
2240                 if (tx->tx_wrq != NULL)
2241                         CFS_FREE_PTR_ARRAY(tx->tx_wrq,
2242                                            (1 + IBLND_MAX_RDMA_FRAGS));
2243                 if (tx->tx_sge != NULL)
2244                         CFS_FREE_PTR_ARRAY(tx->tx_sge,
2245                                            (1 + IBLND_MAX_RDMA_FRAGS) *
2246                                            wrq_sge);
2247                 if (tx->tx_rd != NULL)
2248                         LIBCFS_FREE(tx->tx_rd,
2249                                     offsetof(struct kib_rdma_desc,
2250                                              rd_frags[IBLND_MAX_RDMA_FRAGS]));
2251         }
2252
2253         CFS_FREE_PTR_ARRAY(tpo->tpo_tx_descs, pool->po_size);
2254 out:
2255         kiblnd_fini_pool(pool);
2256         CFS_FREE_PTR(tpo);
2257 }
2258
2259 static int kiblnd_tx_pool_size(struct lnet_ni *ni, int ncpts)
2260 {
2261         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2262         int ntx;
2263
2264         tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2265         ntx = tunables->lnd_ntx / ncpts;
2266
2267         return max(IBLND_TX_POOL, ntx);
2268 }
2269
2270 static int
2271 kiblnd_create_tx_pool(struct kib_poolset *ps, int size, struct kib_pool **pp_po)
2272 {
2273         int            i;
2274         int            npg;
2275         struct kib_pool *pool;
2276         struct kib_tx_pool *tpo;
2277
2278         LIBCFS_CPT_ALLOC(tpo, lnet_cpt_table(), ps->ps_cpt, sizeof(*tpo));
2279         if (tpo == NULL) {
2280                 CERROR("Failed to allocate TX pool\n");
2281                 return -ENOMEM;
2282         }
2283
2284         pool = &tpo->tpo_pool;
2285         kiblnd_init_pool(ps, pool, size);
2286         tpo->tpo_tx_descs = NULL;
2287         tpo->tpo_tx_pages = NULL;
2288
2289         npg = (size * IBLND_MSG_SIZE + PAGE_SIZE - 1) / PAGE_SIZE;
2290         if (kiblnd_alloc_pages(&tpo->tpo_tx_pages, ps->ps_cpt, npg) != 0) {
2291                 CERROR("Can't allocate tx pages: %d\n", npg);
2292                 CFS_FREE_PTR(tpo);
2293                 return -ENOMEM;
2294         }
2295
2296         LIBCFS_CPT_ALLOC(tpo->tpo_tx_descs, lnet_cpt_table(), ps->ps_cpt,
2297                          size * sizeof(struct kib_tx));
2298         if (tpo->tpo_tx_descs == NULL) {
2299                 CERROR("Can't allocate %d tx descriptors\n", size);
2300                 ps->ps_pool_destroy(pool);
2301                 return -ENOMEM;
2302         }
2303
2304         memset(tpo->tpo_tx_descs, 0, size * sizeof(struct kib_tx));
2305
2306         for (i = 0; i < size; i++) {
2307                 struct kib_tx *tx = &tpo->tpo_tx_descs[i];
2308                 int       wrq_sge = *kiblnd_tunables.kib_wrq_sge;
2309
2310                 tx->tx_pool = tpo;
2311                 if (ps->ps_net->ibn_fmr_ps != NULL) {
2312                         LIBCFS_CPT_ALLOC(tx->tx_pages,
2313                                          lnet_cpt_table(), ps->ps_cpt,
2314                                          LNET_MAX_IOV * sizeof(*tx->tx_pages));
2315                         if (tx->tx_pages == NULL)
2316                                 break;
2317                 }
2318
2319                 LIBCFS_CPT_ALLOC(tx->tx_frags, lnet_cpt_table(), ps->ps_cpt,
2320                                  (1 + IBLND_MAX_RDMA_FRAGS) *
2321                                  sizeof(*tx->tx_frags));
2322                 if (tx->tx_frags == NULL)
2323                         break;
2324
2325                 sg_init_table(tx->tx_frags, IBLND_MAX_RDMA_FRAGS + 1);
2326
2327                 LIBCFS_CPT_ALLOC(tx->tx_wrq, lnet_cpt_table(), ps->ps_cpt,
2328                                  (1 + IBLND_MAX_RDMA_FRAGS) *
2329                                  sizeof(*tx->tx_wrq));
2330                 if (tx->tx_wrq == NULL)
2331                         break;
2332
2333                 LIBCFS_CPT_ALLOC(tx->tx_sge, lnet_cpt_table(), ps->ps_cpt,
2334                                  (1 + IBLND_MAX_RDMA_FRAGS) * wrq_sge *
2335                                  sizeof(*tx->tx_sge));
2336                 if (tx->tx_sge == NULL)
2337                         break;
2338
2339                 LIBCFS_CPT_ALLOC(tx->tx_rd, lnet_cpt_table(), ps->ps_cpt,
2340                                  offsetof(struct kib_rdma_desc,
2341                                           rd_frags[IBLND_MAX_RDMA_FRAGS]));
2342                 if (tx->tx_rd == NULL)
2343                         break;
2344         }
2345
2346         if (i == size) {
2347                 kiblnd_map_tx_pool(tpo);
2348                 *pp_po = pool;
2349                 return 0;
2350         }
2351
2352         ps->ps_pool_destroy(pool);
2353         return -ENOMEM;
2354 }
2355
2356 static void
2357 kiblnd_tx_init(struct kib_pool *pool, struct list_head *node)
2358 {
2359         struct kib_tx_poolset *tps = container_of(pool->po_owner,
2360                                                   struct kib_tx_poolset,
2361                                                   tps_poolset);
2362         struct kib_tx *tx  = list_entry(node, struct kib_tx, tx_list);
2363
2364         tx->tx_cookie = tps->tps_next_tx_cookie++;
2365 }
2366
2367 static void
2368 kiblnd_net_fini_pools(struct kib_net *net)
2369 {
2370         int     i;
2371
2372         cfs_cpt_for_each(i, lnet_cpt_table()) {
2373                 struct kib_tx_poolset *tps;
2374                 struct kib_fmr_poolset *fps;
2375
2376                 if (net->ibn_tx_ps != NULL) {
2377                         tps = net->ibn_tx_ps[i];
2378                         kiblnd_fini_poolset(&tps->tps_poolset);
2379                 }
2380
2381                 if (net->ibn_fmr_ps != NULL) {
2382                         fps = net->ibn_fmr_ps[i];
2383                         kiblnd_fini_fmr_poolset(fps);
2384                 }
2385         }
2386
2387         if (net->ibn_tx_ps != NULL) {
2388                 cfs_percpt_free(net->ibn_tx_ps);
2389                 net->ibn_tx_ps = NULL;
2390         }
2391
2392         if (net->ibn_fmr_ps != NULL) {
2393                 cfs_percpt_free(net->ibn_fmr_ps);
2394                 net->ibn_fmr_ps = NULL;
2395         }
2396 }
2397
2398 static int
2399 kiblnd_net_init_pools(struct kib_net *net, struct lnet_ni *ni, __u32 *cpts,
2400                       int ncpts)
2401 {
2402         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2403 #ifdef HAVE_IB_GET_DMA_MR
2404         unsigned long   flags;
2405 #endif
2406         int             cpt;
2407         int             rc;
2408         int             i;
2409
2410         tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2411
2412 #ifdef HAVE_IB_GET_DMA_MR
2413         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2414         /*
2415          * if lnd_map_on_demand is zero then we have effectively disabled
2416          * FMR or FastReg and we're using global memory regions
2417          * exclusively.
2418          */
2419         if (!tunables->lnd_map_on_demand) {
2420                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2421                                            flags);
2422                 goto create_tx_pool;
2423         }
2424
2425         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2426 #endif
2427
2428         if (tunables->lnd_fmr_pool_size < tunables->lnd_ntx / 4) {
2429                 CERROR("Can't set fmr pool size (%d) < ntx / 4(%d)\n",
2430                        tunables->lnd_fmr_pool_size,
2431                        tunables->lnd_ntx / 4);
2432                 rc = -EINVAL;
2433                 goto failed;
2434         }
2435
2436         /* TX pool must be created later than FMR, see LU-2268
2437          * for details */
2438         LASSERT(net->ibn_tx_ps == NULL);
2439
2440         /* premapping can fail if ibd_nmr > 1, so we always create
2441          * FMR pool and map-on-demand if premapping failed */
2442
2443         net->ibn_fmr_ps = cfs_percpt_alloc(lnet_cpt_table(),
2444                                            sizeof(struct kib_fmr_poolset));
2445         if (net->ibn_fmr_ps == NULL) {
2446                 CERROR("Failed to allocate FMR pool array\n");
2447                 rc = -ENOMEM;
2448                 goto failed;
2449         }
2450
2451         for (i = 0; i < ncpts; i++) {
2452                 cpt = (cpts == NULL) ? i : cpts[i];
2453                 rc = kiblnd_init_fmr_poolset(net->ibn_fmr_ps[cpt], cpt, ncpts,
2454                                              net, tunables);
2455                 if (rc != 0) {
2456                         CERROR("Can't initialize FMR pool for CPT %d: %d\n",
2457                                cpt, rc);
2458                         goto failed;
2459                 }
2460         }
2461
2462         if (i > 0)
2463                 LASSERT(i == ncpts);
2464
2465 #ifdef HAVE_IB_GET_DMA_MR
2466  create_tx_pool:
2467 #endif
2468         net->ibn_tx_ps = cfs_percpt_alloc(lnet_cpt_table(),
2469                                           sizeof(struct kib_tx_poolset));
2470         if (net->ibn_tx_ps == NULL) {
2471                 CERROR("Failed to allocate tx pool array\n");
2472                 rc = -ENOMEM;
2473                 goto failed;
2474         }
2475
2476         for (i = 0; i < ncpts; i++) {
2477                 cpt = (cpts == NULL) ? i : cpts[i];
2478                 rc = kiblnd_init_poolset(&net->ibn_tx_ps[cpt]->tps_poolset,
2479                                          cpt, net, "TX",
2480                                          kiblnd_tx_pool_size(ni, ncpts),
2481                                          kiblnd_create_tx_pool,
2482                                          kiblnd_destroy_tx_pool,
2483                                          kiblnd_tx_init, NULL);
2484                 if (rc != 0) {
2485                         CERROR("Can't initialize TX pool for CPT %d: %d\n",
2486                                cpt, rc);
2487                         goto failed;
2488                 }
2489         }
2490
2491         return 0;
2492  failed:
2493         kiblnd_net_fini_pools(net);
2494         LASSERT(rc != 0);
2495         return rc;
2496 }
2497
2498 static int
2499 kiblnd_port_get_attr(struct kib_hca_dev *hdev)
2500 {
2501         struct ib_port_attr *port_attr;
2502         int rc;
2503         unsigned long flags;
2504         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2505
2506         LIBCFS_ALLOC(port_attr, sizeof(*port_attr));
2507         if (port_attr == NULL) {
2508                 CDEBUG(D_NETERROR, "Out of memory\n");
2509                 return -ENOMEM;
2510         }
2511
2512         rc = ib_query_port(hdev->ibh_ibdev, hdev->ibh_port, port_attr);
2513
2514         write_lock_irqsave(g_lock, flags);
2515
2516         if (rc == 0)
2517                 hdev->ibh_state = port_attr->state == IB_PORT_ACTIVE
2518                                  ? IBLND_DEV_PORT_ACTIVE
2519                                  : IBLND_DEV_PORT_DOWN;
2520
2521         write_unlock_irqrestore(g_lock, flags);
2522         LIBCFS_FREE(port_attr, sizeof(*port_attr));
2523
2524         if (rc != 0) {
2525                 CDEBUG(D_NETERROR, "Failed to query IB port: %d\n", rc);
2526                 return rc;
2527         }
2528         return 0;
2529 }
2530
2531 static inline void
2532 kiblnd_set_ni_fatal_on(struct kib_hca_dev *hdev, int val)
2533 {
2534         struct kib_net  *net;
2535
2536         /* for health check */
2537         list_for_each_entry(net, &hdev->ibh_dev->ibd_nets, ibn_list) {
2538                 if (val)
2539                         CDEBUG(D_NETERROR, "Fatal device error for NI %s\n",
2540                                         libcfs_nid2str(net->ibn_ni->ni_nid));
2541                 atomic_set(&net->ibn_ni->ni_fatal_error_on, val);
2542         }
2543 }
2544
2545 void
2546 kiblnd_event_handler(struct ib_event_handler *handler, struct ib_event *event)
2547 {
2548         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2549         struct kib_hca_dev  *hdev;
2550         unsigned long flags;
2551
2552         hdev = container_of(handler, struct kib_hca_dev, ibh_event_handler);
2553
2554         write_lock_irqsave(g_lock, flags);
2555
2556         switch (event->event) {
2557         case IB_EVENT_DEVICE_FATAL:
2558                 CDEBUG(D_NET, "IB device fatal\n");
2559                 hdev->ibh_state = IBLND_DEV_FATAL;
2560                 kiblnd_set_ni_fatal_on(hdev, 1);
2561                 break;
2562         case IB_EVENT_PORT_ACTIVE:
2563                 CDEBUG(D_NET, "IB port active\n");
2564                 if (event->element.port_num == hdev->ibh_port) {
2565                         hdev->ibh_state = IBLND_DEV_PORT_ACTIVE;
2566                         kiblnd_set_ni_fatal_on(hdev, 0);
2567                 }
2568                 break;
2569         case IB_EVENT_PORT_ERR:
2570                 CDEBUG(D_NET, "IB port err\n");
2571                 if (event->element.port_num == hdev->ibh_port) {
2572                         hdev->ibh_state = IBLND_DEV_PORT_DOWN;
2573                         kiblnd_set_ni_fatal_on(hdev, 1);
2574                 }
2575                 break;
2576         default:
2577                 break;
2578         }
2579         write_unlock_irqrestore(g_lock, flags);
2580 }
2581
2582 static int
2583 kiblnd_hdev_get_attr(struct kib_hca_dev *hdev)
2584 {
2585         struct ib_device_attr *dev_attr;
2586         int rc = 0;
2587         int rc2 = 0;
2588
2589         /* It's safe to assume a HCA can handle a page size
2590          * matching that of the native system */
2591         hdev->ibh_page_shift = PAGE_SHIFT;
2592         hdev->ibh_page_size  = 1 << PAGE_SHIFT;
2593         hdev->ibh_page_mask  = ~((__u64)hdev->ibh_page_size - 1);
2594
2595 #ifndef HAVE_IB_DEVICE_ATTRS
2596         LIBCFS_ALLOC(dev_attr, sizeof(*dev_attr));
2597         if (dev_attr == NULL) {
2598                 CERROR("Out of memory\n");
2599                 return -ENOMEM;
2600         }
2601
2602         rc = ib_query_device(hdev->ibh_ibdev, dev_attr);
2603         if (rc != 0) {
2604                 CERROR("Failed to query IB device: %d\n", rc);
2605                 goto out_clean_attr;
2606         }
2607 #else
2608         dev_attr = &hdev->ibh_ibdev->attrs;
2609 #endif
2610
2611         hdev->ibh_mr_size = dev_attr->max_mr_size;
2612         hdev->ibh_max_qp_wr = dev_attr->max_qp_wr;
2613
2614         /* Setup device Memory Registration capabilities */
2615 #ifdef HAVE_IB_DEVICE_OPS
2616         if (hdev->ibh_ibdev->ops.alloc_fmr &&
2617             hdev->ibh_ibdev->ops.dealloc_fmr &&
2618             hdev->ibh_ibdev->ops.map_phys_fmr &&
2619             hdev->ibh_ibdev->ops.unmap_fmr) {
2620 #else
2621         if (hdev->ibh_ibdev->alloc_fmr &&
2622             hdev->ibh_ibdev->dealloc_fmr &&
2623             hdev->ibh_ibdev->map_phys_fmr &&
2624             hdev->ibh_ibdev->unmap_fmr) {
2625 #endif
2626                 LCONSOLE_INFO("Using FMR for registration\n");
2627                 hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FMR_ENABLED;
2628         } else if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
2629                 LCONSOLE_INFO("Using FastReg for registration\n");
2630                 hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FASTREG_ENABLED;
2631 #ifndef HAVE_IB_ALLOC_FAST_REG_MR
2632 #ifdef IB_DEVICE_SG_GAPS_REG
2633                 if (dev_attr->device_cap_flags & IB_DEVICE_SG_GAPS_REG)
2634                         hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT;
2635 #endif
2636 #endif
2637         } else {
2638                 rc = -ENOSYS;
2639         }
2640
2641         rc2 = kiblnd_port_get_attr(hdev);
2642         if (rc2 != 0)
2643                 return rc2;
2644
2645         if (rc != 0)
2646                 rc = -EINVAL;
2647
2648 #ifndef HAVE_IB_DEVICE_ATTRS
2649 out_clean_attr:
2650         LIBCFS_FREE(dev_attr, sizeof(*dev_attr));
2651 #endif
2652
2653         if (rc == -ENOSYS)
2654                 CERROR("IB device does not support FMRs nor FastRegs, can't "
2655                        "register memory: %d\n", rc);
2656         else if (rc == -EINVAL)
2657                 CERROR("Invalid mr size: %#llx\n", hdev->ibh_mr_size);
2658         return rc;
2659 }
2660
2661 #ifdef HAVE_IB_GET_DMA_MR
2662 static void
2663 kiblnd_hdev_cleanup_mrs(struct kib_hca_dev *hdev)
2664 {
2665         if (hdev->ibh_mrs == NULL)
2666                 return;
2667
2668         ib_dereg_mr(hdev->ibh_mrs);
2669
2670         hdev->ibh_mrs = NULL;
2671 }
2672 #endif
2673
2674 void
2675 kiblnd_hdev_destroy(struct kib_hca_dev *hdev)
2676 {
2677         if (hdev->ibh_event_handler.device != NULL)
2678                 ib_unregister_event_handler(&hdev->ibh_event_handler);
2679
2680 #ifdef HAVE_IB_GET_DMA_MR
2681         kiblnd_hdev_cleanup_mrs(hdev);
2682 #endif
2683
2684         if (hdev->ibh_pd != NULL)
2685                 ib_dealloc_pd(hdev->ibh_pd);
2686
2687         if (hdev->ibh_cmid != NULL)
2688                 rdma_destroy_id(hdev->ibh_cmid);
2689
2690         LIBCFS_FREE(hdev, sizeof(*hdev));
2691 }
2692
2693 #ifdef HAVE_IB_GET_DMA_MR
2694 static int
2695 kiblnd_hdev_setup_mrs(struct kib_hca_dev *hdev)
2696 {
2697         struct ib_mr *mr;
2698         int           acflags = IB_ACCESS_LOCAL_WRITE |
2699                                 IB_ACCESS_REMOTE_WRITE;
2700
2701         mr = ib_get_dma_mr(hdev->ibh_pd, acflags);
2702         if (IS_ERR(mr)) {
2703                 CERROR("Failed ib_get_dma_mr: %ld\n", PTR_ERR(mr));
2704                 kiblnd_hdev_cleanup_mrs(hdev);
2705                 return PTR_ERR(mr);
2706         }
2707
2708         hdev->ibh_mrs = mr;
2709
2710         return 0;
2711 }
2712 #endif
2713
2714 static int
2715 kiblnd_dummy_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2716 {       /* DUMMY */
2717         return 0;
2718 }
2719
2720 static int
2721 kiblnd_dev_need_failover(struct kib_dev *dev, struct net *ns)
2722 {
2723         struct rdma_cm_id  *cmid;
2724         struct sockaddr_in  srcaddr;
2725         struct sockaddr_in  dstaddr;
2726         int                 rc;
2727
2728         if (dev->ibd_hdev == NULL || /* initializing */
2729             dev->ibd_hdev->ibh_cmid == NULL || /* listener is dead */
2730             *kiblnd_tunables.kib_dev_failover > 1) /* debugging */
2731                 return 1;
2732
2733         /* XXX: it's UGLY, but I don't have better way to find
2734          * ib-bonding HCA failover because:
2735          *
2736          * a. no reliable CM event for HCA failover...
2737          * b. no OFED API to get ib_device for current net_device...
2738          *
2739          * We have only two choices at this point:
2740          *
2741          * a. rdma_bind_addr(), it will conflict with listener cmid
2742          * b. rdma_resolve_addr() to zero addr */
2743         cmid = kiblnd_rdma_create_id(ns, kiblnd_dummy_callback, dev,
2744                                      RDMA_PS_TCP, IB_QPT_RC);
2745         if (IS_ERR(cmid)) {
2746                 rc = PTR_ERR(cmid);
2747                 CERROR("Failed to create cmid for failover: %d\n", rc);
2748                 return rc;
2749         }
2750
2751         memset(&srcaddr, 0, sizeof(srcaddr));
2752         srcaddr.sin_family      = AF_INET;
2753         srcaddr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2754
2755         memset(&dstaddr, 0, sizeof(dstaddr));
2756         dstaddr.sin_family = AF_INET;
2757         rc = rdma_resolve_addr(cmid, (struct sockaddr *)&srcaddr,
2758                                (struct sockaddr *)&dstaddr, 1);
2759         if (rc != 0 || cmid->device == NULL) {
2760                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2761                        dev->ibd_ifname, &dev->ibd_ifip,
2762                        cmid->device, rc);
2763                 rdma_destroy_id(cmid);
2764                 return rc;
2765         }
2766
2767         rc = dev->ibd_hdev->ibh_ibdev != cmid->device; /* true for failover */
2768         rdma_destroy_id(cmid);
2769         return rc;
2770 }
2771
2772 int
2773 kiblnd_dev_failover(struct kib_dev *dev, struct net *ns)
2774 {
2775         LIST_HEAD(zombie_tpo);
2776         LIST_HEAD(zombie_ppo);
2777         LIST_HEAD(zombie_fpo);
2778         struct rdma_cm_id  *cmid  = NULL;
2779         struct kib_hca_dev *hdev  = NULL;
2780         struct kib_hca_dev *old;
2781         struct ib_pd       *pd;
2782         struct kib_net *net;
2783         struct sockaddr_in  addr;
2784         unsigned long       flags;
2785         int                 rc = 0;
2786         int                 i;
2787
2788         LASSERT (*kiblnd_tunables.kib_dev_failover > 1 ||
2789                  dev->ibd_can_failover ||
2790                  dev->ibd_hdev == NULL);
2791
2792         rc = kiblnd_dev_need_failover(dev, ns);
2793         if (rc <= 0)
2794                 goto out;
2795
2796         if (dev->ibd_hdev != NULL &&
2797             dev->ibd_hdev->ibh_cmid != NULL) {
2798                 /* XXX it's not good to close old listener at here,
2799                  * because we can fail to create new listener.
2800                  * But we have to close it now, otherwise rdma_bind_addr
2801                  * will return EADDRINUSE... How crap! */
2802                 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2803
2804                 cmid = dev->ibd_hdev->ibh_cmid;
2805                 /* make next schedule of kiblnd_dev_need_failover()
2806                  * return 1 for me */
2807                 dev->ibd_hdev->ibh_cmid  = NULL;
2808                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2809
2810                 rdma_destroy_id(cmid);
2811         }
2812
2813         cmid = kiblnd_rdma_create_id(ns, kiblnd_cm_callback, dev, RDMA_PS_TCP,
2814                                      IB_QPT_RC);
2815         if (IS_ERR(cmid)) {
2816                 rc = PTR_ERR(cmid);
2817                 CERROR("Failed to create cmid for failover: %d\n", rc);
2818                 goto out;
2819         }
2820
2821         memset(&addr, 0, sizeof(addr));
2822         addr.sin_family      = AF_INET;
2823         addr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2824         addr.sin_port        = htons(*kiblnd_tunables.kib_service);
2825
2826         /* Bind to failover device or port */
2827         rc = rdma_bind_addr(cmid, (struct sockaddr *)&addr);
2828         if (rc != 0 || cmid->device == NULL) {
2829                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2830                        dev->ibd_ifname, &dev->ibd_ifip,
2831                        cmid->device, rc);
2832                 rdma_destroy_id(cmid);
2833                 goto out;
2834         }
2835
2836         LIBCFS_ALLOC(hdev, sizeof(*hdev));
2837         if (hdev == NULL) {
2838                 CERROR("Failed to allocate kib_hca_dev\n");
2839                 rdma_destroy_id(cmid);
2840                 rc = -ENOMEM;
2841                 goto out;
2842         }
2843
2844         atomic_set(&hdev->ibh_ref, 1);
2845         hdev->ibh_dev   = dev;
2846         hdev->ibh_cmid  = cmid;
2847         hdev->ibh_ibdev = cmid->device;
2848         hdev->ibh_port  = cmid->port_num;
2849
2850 #ifdef HAVE_IB_ALLOC_PD_2ARGS
2851         pd = ib_alloc_pd(cmid->device, 0);
2852 #else
2853         pd = ib_alloc_pd(cmid->device);
2854 #endif
2855         if (IS_ERR(pd)) {
2856                 rc = PTR_ERR(pd);
2857                 CERROR("Can't allocate PD: %d\n", rc);
2858                 goto out;
2859         }
2860
2861         hdev->ibh_pd = pd;
2862
2863         rc = rdma_listen(cmid, 0);
2864         if (rc != 0) {
2865                 CERROR("Can't start new listener: %d\n", rc);
2866                 goto out;
2867         }
2868
2869         rc = kiblnd_hdev_get_attr(hdev);
2870         if (rc != 0) {
2871                 CERROR("Can't get device attributes: %d\n", rc);
2872                 goto out;
2873         }
2874
2875 #ifdef HAVE_IB_GET_DMA_MR
2876         rc = kiblnd_hdev_setup_mrs(hdev);
2877         if (rc != 0) {
2878                 CERROR("Can't setup device: %d\n", rc);
2879                 goto out;
2880         }
2881 #endif
2882
2883         INIT_IB_EVENT_HANDLER(&hdev->ibh_event_handler,
2884                                 hdev->ibh_ibdev, kiblnd_event_handler);
2885         ib_register_event_handler(&hdev->ibh_event_handler);
2886
2887         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2888
2889         old = dev->ibd_hdev;
2890         dev->ibd_hdev = hdev;   /* take over the refcount */
2891         hdev = old;
2892
2893         list_for_each_entry(net, &dev->ibd_nets, ibn_list) {
2894                 cfs_cpt_for_each(i, lnet_cpt_table()) {
2895                         kiblnd_fail_poolset(&net->ibn_tx_ps[i]->tps_poolset,
2896                                             &zombie_tpo);
2897
2898                         if (net->ibn_fmr_ps != NULL)
2899                                 kiblnd_fail_fmr_poolset(net->ibn_fmr_ps[i],
2900                                                         &zombie_fpo);
2901                 }
2902         }
2903
2904         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2905  out:
2906         if (!list_empty(&zombie_tpo))
2907                 kiblnd_destroy_pool_list(&zombie_tpo);
2908         if (!list_empty(&zombie_ppo))
2909                 kiblnd_destroy_pool_list(&zombie_ppo);
2910         if (!list_empty(&zombie_fpo))
2911                 kiblnd_destroy_fmr_pool_list(&zombie_fpo);
2912         if (hdev != NULL)
2913                 kiblnd_hdev_decref(hdev);
2914
2915         if (rc != 0)
2916                 dev->ibd_failed_failover++;
2917         else
2918                 dev->ibd_failed_failover = 0;
2919
2920         return rc;
2921 }
2922
2923 void
2924 kiblnd_destroy_dev(struct kib_dev *dev)
2925 {
2926         LASSERT(dev->ibd_nnets == 0);
2927         LASSERT(list_empty(&dev->ibd_nets));
2928
2929         list_del(&dev->ibd_fail_list);
2930         list_del(&dev->ibd_list);
2931
2932         if (dev->ibd_hdev != NULL)
2933                 kiblnd_hdev_decref(dev->ibd_hdev);
2934
2935         LIBCFS_FREE(dev, sizeof(*dev));
2936 }
2937
2938 static void
2939 kiblnd_base_shutdown(void)
2940 {
2941         struct kib_sched_info   *sched;
2942         int                     i;
2943
2944         LASSERT(list_empty(&kiblnd_data.kib_devs));
2945
2946         CDEBUG(D_MALLOC, "before LND base cleanup: kmem %d\n",
2947                atomic_read(&libcfs_kmemory));
2948
2949         switch (kiblnd_data.kib_init) {
2950         default:
2951                 LBUG();
2952
2953         case IBLND_INIT_ALL:
2954         case IBLND_INIT_DATA:
2955                 LASSERT (kiblnd_data.kib_peers != NULL);
2956                 for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
2957                         LASSERT(list_empty(&kiblnd_data.kib_peers[i]));
2958                 }
2959                 LASSERT(list_empty(&kiblnd_data.kib_connd_zombies));
2960                 LASSERT(list_empty(&kiblnd_data.kib_connd_conns));
2961                 LASSERT(list_empty(&kiblnd_data.kib_reconn_list));
2962                 LASSERT(list_empty(&kiblnd_data.kib_reconn_wait));
2963
2964                 /* flag threads to terminate; wake and wait for them to die */
2965                 kiblnd_data.kib_shutdown = 1;
2966
2967                 /* NB: we really want to stop scheduler threads net by net
2968                  * instead of the whole module, this should be improved
2969                  * with dynamic configuration LNet */
2970                 cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds)
2971                         wake_up_all(&sched->ibs_waitq);
2972
2973                 wake_up_all(&kiblnd_data.kib_connd_waitq);
2974                 wake_up_all(&kiblnd_data.kib_failover_waitq);
2975
2976                 wait_var_event_warning(&kiblnd_data.kib_nthreads,
2977                                        !atomic_read(&kiblnd_data.kib_nthreads),
2978                                        "Waiting for %d threads to terminate\n",
2979                                        atomic_read(&kiblnd_data.kib_nthreads));
2980                 /* fall through */
2981
2982         case IBLND_INIT_NOTHING:
2983                 break;
2984         }
2985
2986         if (kiblnd_data.kib_peers)
2987                 CFS_FREE_PTR_ARRAY(kiblnd_data.kib_peers,
2988                                    kiblnd_data.kib_peer_hash_size);
2989
2990         if (kiblnd_data.kib_scheds != NULL)
2991                 cfs_percpt_free(kiblnd_data.kib_scheds);
2992
2993         CDEBUG(D_MALLOC, "after LND base cleanup: kmem %d\n",
2994                atomic_read(&libcfs_kmemory));
2995
2996         kiblnd_data.kib_init = IBLND_INIT_NOTHING;
2997         module_put(THIS_MODULE);
2998 }
2999
3000 static void
3001 kiblnd_shutdown(struct lnet_ni *ni)
3002 {
3003         struct kib_net *net = ni->ni_data;
3004         rwlock_t     *g_lock = &kiblnd_data.kib_global_lock;
3005         unsigned long     flags;
3006
3007         LASSERT(kiblnd_data.kib_init == IBLND_INIT_ALL);
3008
3009         if (net == NULL)
3010                 goto out;
3011
3012         CDEBUG(D_MALLOC, "before LND net cleanup: kmem %d\n",
3013                atomic_read(&libcfs_kmemory));
3014
3015         write_lock_irqsave(g_lock, flags);
3016         net->ibn_shutdown = 1;
3017         write_unlock_irqrestore(g_lock, flags);
3018
3019         switch (net->ibn_init) {
3020         default:
3021                 LBUG();
3022
3023         case IBLND_INIT_ALL:
3024                 /* nuke all existing peers within this net */
3025                 kiblnd_del_peer(ni, LNET_NID_ANY);
3026
3027                 /* Wait for all peer_ni state to clean up */
3028                 wait_var_event_warning(&net->ibn_npeers,
3029                                        atomic_read(&net->ibn_npeers) == 0,
3030                                        "%s: waiting for %d peers to disconnect\n",
3031                                        libcfs_nid2str(ni->ni_nid),
3032                                        atomic_read(&net->ibn_npeers));
3033
3034                 kiblnd_net_fini_pools(net);
3035
3036                 write_lock_irqsave(g_lock, flags);
3037                 LASSERT(net->ibn_dev->ibd_nnets > 0);
3038                 net->ibn_dev->ibd_nnets--;
3039                 list_del(&net->ibn_list);
3040                 write_unlock_irqrestore(g_lock, flags);
3041
3042                 /* fall through */
3043
3044         case IBLND_INIT_NOTHING:
3045                 LASSERT (atomic_read(&net->ibn_nconns) == 0);
3046
3047                 if (net->ibn_dev != NULL &&
3048                     net->ibn_dev->ibd_nnets == 0)
3049                         kiblnd_destroy_dev(net->ibn_dev);
3050
3051                 break;
3052         }
3053
3054         CDEBUG(D_MALLOC, "after LND net cleanup: kmem %d\n",
3055                atomic_read(&libcfs_kmemory));
3056
3057         net->ibn_init = IBLND_INIT_NOTHING;
3058         ni->ni_data = NULL;
3059
3060         LIBCFS_FREE(net, sizeof(*net));
3061
3062 out:
3063         if (list_empty(&kiblnd_data.kib_devs))
3064                 kiblnd_base_shutdown();
3065 }
3066
3067 static int
3068 kiblnd_base_startup(struct net *ns)
3069 {
3070         struct kib_sched_info   *sched;
3071         int                     rc;
3072         int                     i;
3073
3074         LASSERT(kiblnd_data.kib_init == IBLND_INIT_NOTHING);
3075
3076         if (!try_module_get(THIS_MODULE))
3077                 goto failed;
3078
3079         memset(&kiblnd_data, 0, sizeof(kiblnd_data)); /* zero pointers, flags etc */
3080
3081         rwlock_init(&kiblnd_data.kib_global_lock);
3082
3083         INIT_LIST_HEAD(&kiblnd_data.kib_devs);
3084         INIT_LIST_HEAD(&kiblnd_data.kib_failed_devs);
3085
3086         kiblnd_data.kib_peer_hash_size = IBLND_PEER_HASH_SIZE;
3087         CFS_ALLOC_PTR_ARRAY(kiblnd_data.kib_peers,
3088                             kiblnd_data.kib_peer_hash_size);
3089         if (kiblnd_data.kib_peers == NULL)
3090                 goto failed;
3091
3092         for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++)
3093                 INIT_LIST_HEAD(&kiblnd_data.kib_peers[i]);
3094
3095         spin_lock_init(&kiblnd_data.kib_connd_lock);
3096         INIT_LIST_HEAD(&kiblnd_data.kib_connd_conns);
3097         INIT_LIST_HEAD(&kiblnd_data.kib_connd_zombies);
3098         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_list);
3099         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_wait);
3100
3101         init_waitqueue_head(&kiblnd_data.kib_connd_waitq);
3102         init_waitqueue_head(&kiblnd_data.kib_failover_waitq);
3103
3104         kiblnd_data.kib_scheds = cfs_percpt_alloc(lnet_cpt_table(),
3105                                                   sizeof(*sched));
3106         if (kiblnd_data.kib_scheds == NULL)
3107                 goto failed;
3108
3109         cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
3110                 int     nthrs;
3111
3112                 spin_lock_init(&sched->ibs_lock);
3113                 INIT_LIST_HEAD(&sched->ibs_conns);
3114                 init_waitqueue_head(&sched->ibs_waitq);
3115
3116                 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
3117                 if (*kiblnd_tunables.kib_nscheds > 0) {
3118                         nthrs = min(nthrs, *kiblnd_tunables.kib_nscheds);
3119                 } else {
3120                         /* max to half of CPUs, another half is reserved for
3121                          * upper layer modules */
3122                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
3123                 }
3124
3125                 sched->ibs_nthreads_max = nthrs;
3126                 sched->ibs_cpt = i;
3127         }
3128
3129         kiblnd_data.kib_error_qpa.qp_state = IB_QPS_ERR;
3130
3131         /* lists/ptrs/locks initialised */
3132         kiblnd_data.kib_init = IBLND_INIT_DATA;
3133         /*****************************************************/
3134
3135         rc = kiblnd_thread_start(kiblnd_connd, NULL, "kiblnd_connd");
3136         if (rc != 0) {
3137                 CERROR("Can't spawn o2iblnd connd: %d\n", rc);
3138                 goto failed;
3139         }
3140
3141         if (*kiblnd_tunables.kib_dev_failover != 0)
3142                 rc = kiblnd_thread_start(kiblnd_failover_thread, ns,
3143                                          "kiblnd_failover");
3144
3145         if (rc != 0) {
3146                 CERROR("Can't spawn o2iblnd failover thread: %d\n", rc);
3147                 goto failed;
3148         }
3149
3150         /* flag everything initialised */
3151         kiblnd_data.kib_init = IBLND_INIT_ALL;
3152         /*****************************************************/
3153
3154         return 0;
3155
3156  failed:
3157         kiblnd_base_shutdown();
3158         return -ENETDOWN;
3159 }
3160
3161 static int
3162 kiblnd_start_schedulers(struct kib_sched_info *sched)
3163 {
3164         int     rc = 0;
3165         int     nthrs;
3166         int     i;
3167
3168         if (sched->ibs_nthreads == 0) {
3169                 if (*kiblnd_tunables.kib_nscheds > 0) {
3170                         nthrs = sched->ibs_nthreads_max;
3171                 } else {
3172                         nthrs = cfs_cpt_weight(lnet_cpt_table(),
3173                                                sched->ibs_cpt);
3174                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
3175                         nthrs = min(IBLND_N_SCHED_HIGH, nthrs);
3176                 }
3177         } else {
3178                 LASSERT(sched->ibs_nthreads <= sched->ibs_nthreads_max);
3179                 /* increase one thread if there is new interface */
3180                 nthrs = (sched->ibs_nthreads < sched->ibs_nthreads_max);
3181         }
3182
3183         for (i = 0; i < nthrs; i++) {
3184                 long    id;
3185                 char    name[20];
3186                 id = KIB_THREAD_ID(sched->ibs_cpt, sched->ibs_nthreads + i);
3187                 snprintf(name, sizeof(name), "kiblnd_sd_%02ld_%02ld",
3188                          KIB_THREAD_CPT(id), KIB_THREAD_TID(id));
3189                 rc = kiblnd_thread_start(kiblnd_scheduler, (void *)id, name);
3190                 if (rc == 0)
3191                         continue;
3192
3193                 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
3194                        sched->ibs_cpt, sched->ibs_nthreads + i, rc);
3195                 break;
3196         }
3197
3198         sched->ibs_nthreads += i;
3199         return rc;
3200 }
3201
3202 static int kiblnd_dev_start_threads(struct kib_dev *dev, bool newdev, u32 *cpts,
3203                                     int ncpts)
3204 {
3205         int     cpt;
3206         int     rc;
3207         int     i;
3208
3209         for (i = 0; i < ncpts; i++) {
3210                 struct kib_sched_info *sched;
3211
3212                 cpt = (cpts == NULL) ? i : cpts[i];
3213                 sched = kiblnd_data.kib_scheds[cpt];
3214
3215                 if (!newdev && sched->ibs_nthreads > 0)
3216                         continue;
3217
3218                 rc = kiblnd_start_schedulers(kiblnd_data.kib_scheds[cpt]);
3219                 if (rc != 0) {
3220                         CERROR("Failed to start scheduler threads for %s\n",
3221                                dev->ibd_ifname);
3222                         return rc;
3223                 }
3224         }
3225         return 0;
3226 }
3227
3228 static struct kib_dev *
3229 kiblnd_dev_search(char *ifname)
3230 {
3231         struct kib_dev *alias = NULL;
3232         struct kib_dev *dev;
3233         char            *colon;
3234         char            *colon2;
3235
3236         colon = strchr(ifname, ':');
3237         list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3238                 if (strcmp(&dev->ibd_ifname[0], ifname) == 0)
3239                         return dev;
3240
3241                 if (alias != NULL)
3242                         continue;
3243
3244                 colon2 = strchr(dev->ibd_ifname, ':');
3245                 if (colon != NULL)
3246                         *colon = 0;
3247                 if (colon2 != NULL)
3248                         *colon2 = 0;
3249
3250                 if (strcmp(&dev->ibd_ifname[0], ifname) == 0)
3251                         alias = dev;
3252
3253                 if (colon != NULL)
3254                         *colon = ':';
3255                 if (colon2 != NULL)
3256                         *colon2 = ':';
3257         }
3258         return alias;
3259 }
3260
3261 static int
3262 kiblnd_startup(struct lnet_ni *ni)
3263 {
3264         char *ifname = NULL;
3265         struct lnet_inetdev *ifaces = NULL;
3266         struct kib_dev *ibdev = NULL;
3267         struct kib_net *net = NULL;
3268         unsigned long flags;
3269         int rc;
3270         int i;
3271         bool newdev;
3272
3273         LASSERT(ni->ni_net->net_lnd == &the_o2iblnd);
3274
3275         if (kiblnd_data.kib_init == IBLND_INIT_NOTHING) {
3276                 rc = kiblnd_base_startup(ni->ni_net_ns);
3277                 if (rc != 0)
3278                         return rc;
3279         }
3280
3281         LIBCFS_ALLOC(net, sizeof(*net));
3282         ni->ni_data = net;
3283         if (net == NULL) {
3284                 rc = -ENOMEM;
3285                 goto failed;
3286         }
3287
3288         net->ibn_ni = ni;
3289         net->ibn_incarnation = ktime_get_real_ns() / NSEC_PER_USEC;
3290
3291         kiblnd_tunables_setup(ni);
3292
3293         /*
3294          * ni_interfaces is only to support legacy pre Multi-Rail
3295          * tcp bonding for ksocklnd. Multi-Rail wants each secondary
3296          * IP to be treated as an unique 'struct ni' interfaces instead.
3297          */
3298         if (ni->ni_interfaces[0] != NULL) {
3299                 /* Use the IPoIB interface specified in 'networks=' */
3300                 if (ni->ni_interfaces[1] != NULL) {
3301                         CERROR("ko2iblnd: Multiple interfaces not supported\n");
3302                         rc = -EINVAL;
3303                         goto failed;
3304                 }
3305
3306                 ifname = ni->ni_interfaces[0];
3307         } else {
3308                 ifname = *kiblnd_tunables.kib_default_ipif;
3309         }
3310
3311         if (strlen(ifname) >= sizeof(ibdev->ibd_ifname)) {
3312                 CERROR("IPoIB interface name too long: %s\n", ifname);
3313                 rc = -E2BIG;
3314                 goto failed;
3315         }
3316
3317         rc = lnet_inet_enumerate(&ifaces, ni->ni_net_ns);
3318         if (rc < 0)
3319                 goto failed;
3320
3321         for (i = 0; i < rc; i++) {
3322                 if (strcmp(ifname, ifaces[i].li_name) == 0)
3323                         break;
3324         }
3325
3326         if (i == rc) {
3327                 CERROR("ko2iblnd: No matching interfaces\n");
3328                 rc = -ENOENT;
3329                 goto failed;
3330         }
3331
3332         ibdev = kiblnd_dev_search(ifname);
3333         newdev = ibdev == NULL;
3334         /* hmm...create kib_dev even for alias */
3335         if (ibdev == NULL || strcmp(&ibdev->ibd_ifname[0], ifname) != 0) {
3336                 LIBCFS_ALLOC(ibdev, sizeof(*ibdev));
3337                 if (!ibdev) {
3338                         rc = -ENOMEM;
3339                         goto failed;
3340                 }
3341
3342                 ibdev->ibd_ifip = ifaces[i].li_ipaddr;
3343                 strlcpy(ibdev->ibd_ifname, ifaces[i].li_name,
3344                         sizeof(ibdev->ibd_ifname));
3345                 ibdev->ibd_can_failover = !!(ifaces[i].li_flags & IFF_MASTER);
3346
3347                 INIT_LIST_HEAD(&ibdev->ibd_nets);
3348                 INIT_LIST_HEAD(&ibdev->ibd_list); /* not yet in kib_devs */
3349                 INIT_LIST_HEAD(&ibdev->ibd_fail_list);
3350
3351                 /* initialize the device */
3352                 rc = kiblnd_dev_failover(ibdev, ni->ni_net_ns);
3353                 if (rc) {
3354                         CERROR("ko2iblnd: Can't initialize device: rc = %d\n",
3355                                rc);
3356                         goto failed;
3357                 }
3358
3359                 list_add_tail(&ibdev->ibd_list, &kiblnd_data.kib_devs);
3360         }
3361
3362         net->ibn_dev = ibdev;
3363         ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), ibdev->ibd_ifip);
3364
3365         ni->ni_dev_cpt = ifaces[i].li_cpt;
3366
3367         rc = kiblnd_dev_start_threads(ibdev, newdev, ni->ni_cpts, ni->ni_ncpts);
3368         if (rc != 0)
3369                 goto failed;
3370
3371         rc = kiblnd_net_init_pools(net, ni, ni->ni_cpts, ni->ni_ncpts);
3372         if (rc != 0) {
3373                 CERROR("Failed to initialize NI pools: %d\n", rc);
3374                 goto failed;
3375         }
3376
3377         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3378         ibdev->ibd_nnets++;
3379         list_add_tail(&net->ibn_list, &ibdev->ibd_nets);
3380         /* for health check */
3381         if (ibdev->ibd_hdev->ibh_state == IBLND_DEV_PORT_DOWN)
3382                 kiblnd_set_ni_fatal_on(ibdev->ibd_hdev, 1);
3383         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3384
3385         net->ibn_init = IBLND_INIT_ALL;
3386
3387         return 0;
3388
3389 failed:
3390         if (net != NULL && net->ibn_dev == NULL && ibdev != NULL)
3391                 kiblnd_destroy_dev(ibdev);
3392
3393         kfree(ifaces);
3394         kiblnd_shutdown(ni);
3395
3396         CDEBUG(D_NET, "Configuration of device %s failed: rc = %d\n",
3397                ifname ? ifname : "", rc);
3398
3399         return -ENETDOWN;
3400 }
3401
3402 static const struct lnet_lnd the_o2iblnd = {
3403         .lnd_type       = O2IBLND,
3404         .lnd_startup    = kiblnd_startup,
3405         .lnd_shutdown   = kiblnd_shutdown,
3406         .lnd_ctl        = kiblnd_ctl,
3407         .lnd_send       = kiblnd_send,
3408         .lnd_recv       = kiblnd_recv,
3409 };
3410
3411 static void __exit ko2iblnd_exit(void)
3412 {
3413         lnet_unregister_lnd(&the_o2iblnd);
3414 }
3415
3416 static int __init ko2iblnd_init(void)
3417 {
3418         int rc;
3419
3420         BUILD_BUG_ON(sizeof(struct kib_msg) > IBLND_MSG_SIZE);
3421         BUILD_BUG_ON(offsetof(struct kib_msg,
3422                      ibm_u.get.ibgm_rd.rd_frags[IBLND_MAX_RDMA_FRAGS]) >
3423                      IBLND_MSG_SIZE);
3424         BUILD_BUG_ON(offsetof(struct kib_msg,
3425                      ibm_u.putack.ibpam_rd.rd_frags[IBLND_MAX_RDMA_FRAGS]) >
3426                      IBLND_MSG_SIZE);
3427
3428         rc = kiblnd_tunables_init();
3429         if (rc != 0)
3430                 return rc;
3431
3432         lnet_register_lnd(&the_o2iblnd);
3433
3434         return 0;
3435 }
3436
3437 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3438 MODULE_DESCRIPTION("OpenIB gen2 LNet Network Driver");
3439 MODULE_VERSION("2.8.0");
3440 MODULE_LICENSE("GPL");
3441
3442 module_init(ko2iblnd_init);
3443 module_exit(ko2iblnd_exit);