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  *
  31  * lnet/klnds/o2iblnd/o2iblnd.c
  32  *
  33  * Author: Eric Barton <eric@bartonsoftware.com>
  34  */
  35
  36 #include <asm/page.h>
  37 #include <linux/ethtool.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, bool 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          */
 187         msg->ibm_magic    = IBLND_MSG_MAGIC;
 188         msg->ibm_version  = version;
 189         /*   ibm_type */
 190         msg->ibm_credits  = credits;
 191         /*   ibm_nob */
 192         msg->ibm_cksum    = 0;
 193         msg->ibm_srcnid   = lnet_nid_to_nid4(&ni->ni_nid);
 194         msg->ibm_srcstamp = net->ibn_incarnation;
 195         msg->ibm_dstnid   = dstnid;
 196         msg->ibm_dststamp = dststamp;
 197
 198         if (*kiblnd_tunables.kib_cksum) {
 199                 /* NB ibm_cksum zero while computing cksum */
 200                 msg->ibm_cksum = kiblnd_cksum(msg, msg->ibm_nob);
 201         }
 202 }
 203
 204 int kiblnd_unpack_msg(struct kib_msg *msg, int nob)
 205 {
 206         const int hdr_size = offsetof(struct kib_msg, ibm_u);
 207         __u32 msg_cksum;
 208         __u16 version;
 209         int msg_nob;
 210         bool flip;
 211
 212         /* 6 bytes are enough to have received magic + version */
 213         if (nob < 6) {
 214                 CERROR("Short message: %d\n", nob);
 215                 return -EPROTO;
 216         }
 217
 218         if (msg->ibm_magic == IBLND_MSG_MAGIC) {
 219                 flip = false;
 220         } else if (msg->ibm_magic == __swab32(IBLND_MSG_MAGIC)) {
 221                 flip = true;
 222         } else {
 223                 CERROR("Bad magic: %08x\n", msg->ibm_magic);
 224                 return -EPROTO;
 225         }
 226
 227         version = flip ? __swab16(msg->ibm_version) : msg->ibm_version;
 228         if (version != IBLND_MSG_VERSION &&
 229             version != IBLND_MSG_VERSION_1) {
 230                 CERROR("Bad version: %x\n", version);
 231                 return -EPROTO;
 232         }
 233
 234         if (nob < hdr_size) {
 235                 CERROR("Short message: %d\n", nob);
 236                 return -EPROTO;
 237         }
 238
 239         msg_nob = flip ? __swab32(msg->ibm_nob) : msg->ibm_nob;
 240         if (msg_nob > nob) {
 241                 CERROR("Short message: got %d, wanted %d\n", nob, msg_nob);
 242                 return -EPROTO;
 243         }
 244
 245         /* checksum must be computed with ibm_cksum zero and BEFORE anything
 246          * gets flipped
 247          */
 248         msg_cksum = flip ? __swab32(msg->ibm_cksum) : msg->ibm_cksum;
 249         msg->ibm_cksum = 0;
 250         if (msg_cksum != 0 &&
 251             msg_cksum != kiblnd_cksum(msg, msg_nob)) {
 252                 CERROR("Bad checksum\n");
 253                 return -EPROTO;
 254         }
 255
 256         msg->ibm_cksum = msg_cksum;
 257
 258         if (flip) {
 259                 /* leave magic unflipped as a clue to peer_ni endianness */
 260                 msg->ibm_version = version;
 261                 BUILD_BUG_ON(sizeof(msg->ibm_type) != 1);
 262                 BUILD_BUG_ON(sizeof(msg->ibm_credits) != 1);
 263                 msg->ibm_nob     = msg_nob;
 264                 __swab64s(&msg->ibm_srcnid);
 265                 __swab64s(&msg->ibm_srcstamp);
 266                 __swab64s(&msg->ibm_dstnid);
 267                 __swab64s(&msg->ibm_dststamp);
 268         }
 269
 270         if (msg->ibm_srcnid == LNET_NID_ANY) {
 271                 CERROR("Bad src nid: %s\n", libcfs_nid2str(msg->ibm_srcnid));
 272                 return -EPROTO;
 273         }
 274
 275         if (msg_nob < kiblnd_msgtype2size(msg->ibm_type)) {
 276                 CERROR("Short %s: %d(%d)\n", kiblnd_msgtype2str(msg->ibm_type),
 277                        msg_nob, kiblnd_msgtype2size(msg->ibm_type));
 278                 return -EPROTO;
 279         }
 280
 281         switch (msg->ibm_type) {
 282         default:
 283                 CERROR("Unknown message type %x\n", msg->ibm_type);
 284                 return -EPROTO;
 285
 286         case IBLND_MSG_NOOP:
 287         case IBLND_MSG_IMMEDIATE:
 288         case IBLND_MSG_PUT_REQ:
 289                 break;
 290
 291         case IBLND_MSG_PUT_ACK:
 292         case IBLND_MSG_GET_REQ:
 293                 if (kiblnd_unpack_rd(msg, flip))
 294                         return -EPROTO;
 295                 break;
 296
 297         case IBLND_MSG_PUT_NAK:
 298         case IBLND_MSG_PUT_DONE:
 299         case IBLND_MSG_GET_DONE:
 300                 if (flip)
 301                         __swab32s(&msg->ibm_u.completion.ibcm_status);
 302                 break;
 303
 304         case IBLND_MSG_CONNREQ:
 305         case IBLND_MSG_CONNACK:
 306                 if (flip) {
 307                         __swab16s(&msg->ibm_u.connparams.ibcp_queue_depth);
 308                         __swab16s(&msg->ibm_u.connparams.ibcp_max_frags);
 309                         __swab32s(&msg->ibm_u.connparams.ibcp_max_msg_size);
 310                 }
 311                 break;
 312         }
 313         return 0;
 314 }
 315
 316 int
 317 kiblnd_create_peer(struct lnet_ni *ni, struct kib_peer_ni **peerp,
 318                    lnet_nid_t nid)
 319 {
 320         struct kib_peer_ni *peer_ni;
 321         struct kib_net *net = ni->ni_data;
 322         int cpt = lnet_cpt_of_nid(nid, ni);
 323         unsigned long flags;
 324
 325         LASSERT(net != NULL);
 326         LASSERT(nid != LNET_NID_ANY);
 327
 328         LIBCFS_CPT_ALLOC(peer_ni, lnet_cpt_table(), cpt, sizeof(*peer_ni));
 329         if (!peer_ni) {
 330                 CERROR("Cannot allocate peer_ni\n");
 331                 return -ENOMEM;
 332         }
 333
 334         peer_ni->ibp_ni = ni;
 335         peer_ni->ibp_nid = nid;
 336         peer_ni->ibp_error = 0;
 337         peer_ni->ibp_last_alive = 0;
 338         peer_ni->ibp_max_frags = IBLND_MAX_RDMA_FRAGS;
 339         peer_ni->ibp_queue_depth = ni->ni_net->net_tunables.lct_peer_tx_credits;
 340         peer_ni->ibp_queue_depth_mod = 0;       /* try to use the default */
 341         kref_init(&peer_ni->ibp_kref);
 342         atomic_set(&peer_ni->ibp_nconns, 0);
 343
 344         INIT_HLIST_NODE(&peer_ni->ibp_list);
 345         INIT_LIST_HEAD(&peer_ni->ibp_conns);
 346         INIT_LIST_HEAD(&peer_ni->ibp_tx_queue);
 347
 348         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 349
 350         /* always called with a ref on ni, which prevents ni being shutdown */
 351         LASSERT(net->ibn_shutdown == 0);
 352
 353         /* npeers only grows with the global lock held */
 354         atomic_inc(&net->ibn_npeers);
 355
 356         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 357
 358         *peerp = peer_ni;
 359         return 0;
 360 }
 361
 362 void
 363 kiblnd_destroy_peer(struct kref *kref)
 364 {
 365         struct kib_peer_ni *peer_ni = container_of(kref, struct kib_peer_ni,
 366                                                    ibp_kref);
 367         struct kib_net *net = peer_ni->ibp_ni->ni_data;
 368
 369         LASSERT(net != NULL);
 370         LASSERT(!kiblnd_peer_active(peer_ni));
 371         LASSERT(kiblnd_peer_idle(peer_ni));
 372         LASSERT(list_empty(&peer_ni->ibp_tx_queue));
 373
 374         LIBCFS_FREE(peer_ni, sizeof(*peer_ni));
 375
 376         /* NB a peer_ni's connections keep a reference on their peer_ni until
 377          * they are destroyed, so we can be assured that _all_ state to do
 378          * with this peer_ni has been cleaned up when its refcount drops to
 379          * zero.
 380          */
 381         if (atomic_dec_and_test(&net->ibn_npeers))
 382                 wake_up_var(&net->ibn_npeers);
 383 }
 384
 385 struct kib_peer_ni *
 386 kiblnd_find_peer_locked(struct lnet_ni *ni, lnet_nid_t nid)
 387 {
 388         /* the caller is responsible for accounting the additional reference
 389          * that this creates
 390          */
 391         struct kib_peer_ni *peer_ni;
 392
 393         hash_for_each_possible(kiblnd_data.kib_peers, peer_ni,
 394                                ibp_list, nid) {
 395                 LASSERT(!kiblnd_peer_idle(peer_ni));
 396
 397                 /*
 398                  * Match a peer if its NID and the NID of the local NI it
 399                  * communicates over are the same. Otherwise don't match
 400                  * the peer, which will result in a new lnd peer being
 401                  * created.
 402                  */
 403                 if (peer_ni->ibp_nid != nid ||
 404                     !nid_same(&peer_ni->ibp_ni->ni_nid, &ni->ni_nid))
 405                         continue;
 406
 407                 CDEBUG(D_NET, "got peer_ni [%p] -> %s (%d) version: %x\n",
 408                        peer_ni, libcfs_nid2str(nid),
 409                        kref_read(&peer_ni->ibp_kref),
 410                        peer_ni->ibp_version);
 411                 return peer_ni;
 412         }
 413         return NULL;
 414 }
 415
 416 void
 417 kiblnd_unlink_peer_locked(struct kib_peer_ni *peer_ni)
 418 {
 419         LASSERT(list_empty(&peer_ni->ibp_conns));
 420
 421         LASSERT(kiblnd_peer_active(peer_ni));
 422         hlist_del_init(&peer_ni->ibp_list);
 423         /* lose peerlist's ref */
 424         kiblnd_peer_decref(peer_ni);
 425 }
 426
 427
 428 static void
 429 kiblnd_debug_rx(struct kib_rx *rx)
 430 {
 431         CDEBUG(D_CONSOLE, "      %p msg_type %x cred %d\n",
 432                rx, rx->rx_msg->ibm_type,
 433                rx->rx_msg->ibm_credits);
 434 }
 435
 436 static void
 437 kiblnd_debug_tx(struct kib_tx *tx)
 438 {
 439         CDEBUG(D_CONSOLE, "      %p snd %d q %d w %d rc %d dl %lld "
 440                "cookie %#llx msg %s%s type %x cred %d\n",
 441                tx, tx->tx_sending, tx->tx_queued, tx->tx_waiting,
 442                tx->tx_status, ktime_to_ns(tx->tx_deadline), tx->tx_cookie,
 443                tx->tx_lntmsg[0] == NULL ? "-" : "!",
 444                tx->tx_lntmsg[1] == NULL ? "-" : "!",
 445                tx->tx_msg->ibm_type, tx->tx_msg->ibm_credits);
 446 }
 447
 448 static void
 449 kiblnd_debug_conn(struct kib_conn *conn)
 450 {
 451         struct list_head        *tmp;
 452         int                     i;
 453
 454         spin_lock(&conn->ibc_lock);
 455
 456         CDEBUG(D_CONSOLE, "conn[%d] %p [version %x] -> %s:\n",
 457                atomic_read(&conn->ibc_refcount), conn,
 458                conn->ibc_version, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 459         CDEBUG(D_CONSOLE, "   state %d nposted %d/%d cred %d o_cred %d "
 460                " r_cred %d\n", conn->ibc_state, conn->ibc_noops_posted,
 461                conn->ibc_nsends_posted, conn->ibc_credits,
 462                conn->ibc_outstanding_credits, conn->ibc_reserved_credits);
 463         CDEBUG(D_CONSOLE, "   comms_err %d\n", conn->ibc_comms_error);
 464
 465         CDEBUG(D_CONSOLE, "   early_rxs:\n");
 466         list_for_each(tmp, &conn->ibc_early_rxs)
 467                 kiblnd_debug_rx(list_entry(tmp, struct kib_rx, rx_list));
 468
 469         CDEBUG(D_CONSOLE, "   tx_noops:\n");
 470         list_for_each(tmp, &conn->ibc_tx_noops)
 471                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 472
 473         CDEBUG(D_CONSOLE, "   tx_queue_nocred:\n");
 474         list_for_each(tmp, &conn->ibc_tx_queue_nocred)
 475                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 476
 477         CDEBUG(D_CONSOLE, "   tx_queue_rsrvd:\n");
 478         list_for_each(tmp, &conn->ibc_tx_queue_rsrvd)
 479                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 480
 481         CDEBUG(D_CONSOLE, "   tx_queue:\n");
 482         list_for_each(tmp, &conn->ibc_tx_queue)
 483                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 484
 485         CDEBUG(D_CONSOLE, "   active_txs:\n");
 486         list_for_each(tmp, &conn->ibc_active_txs)
 487                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 488
 489         CDEBUG(D_CONSOLE, "   rxs:\n");
 490         for (i = 0; i < IBLND_RX_MSGS(conn); i++)
 491                 kiblnd_debug_rx(&conn->ibc_rxs[i]);
 492
 493         spin_unlock(&conn->ibc_lock);
 494 }
 495
 496 static void
 497 kiblnd_dump_peer_debug_info(struct kib_peer_ni *peer_ni)
 498 {
 499         struct kib_conn *conn;
 500         struct kib_conn *cnxt;
 501         int count = 0;
 502
 503         CDEBUG(D_CONSOLE, "[last_alive, races, reconnected, error]: %lld, %d, %d, %d\n",
 504                peer_ni->ibp_last_alive,
 505                peer_ni->ibp_races,
 506                peer_ni->ibp_reconnected,
 507                peer_ni->ibp_error);
 508         list_for_each_entry_safe(conn, cnxt, &peer_ni->ibp_conns,
 509                                  ibc_list) {
 510                 CDEBUG(D_CONSOLE, "Conn %d:\n", count);
 511                 kiblnd_debug_conn(conn);
 512                 count++;
 513         }
 514 }
 515
 516
 517 static int
 518 kiblnd_get_peer_info(struct lnet_ni *ni, lnet_nid_t nid, int index,
 519                      lnet_nid_t *nidp, int *count)
 520 {
 521         struct kib_peer_ni              *peer_ni;
 522         int                      i;
 523         unsigned long            flags;
 524
 525         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 526
 527         hash_for_each(kiblnd_data.kib_peers, i, peer_ni, ibp_list) {
 528                 LASSERT(!kiblnd_peer_idle(peer_ni));
 529
 530                 if (peer_ni->ibp_ni != ni)
 531                         continue;
 532
 533                 if (peer_ni->ibp_nid == nid)
 534                         kiblnd_dump_peer_debug_info(peer_ni);
 535
 536                 if (index-- > 0)
 537                         continue;
 538
 539                 *nidp = peer_ni->ibp_nid;
 540                 *count = kref_read(&peer_ni->ibp_kref);
 541
 542                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 543                 return 0;
 544         }
 545
 546         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 547         return -ENOENT;
 548 }
 549
 550 static void
 551 kiblnd_del_peer_locked(struct kib_peer_ni *peer_ni)
 552 {
 553         struct kib_conn *cnxt;
 554         struct kib_conn *conn;
 555
 556         if (list_empty(&peer_ni->ibp_conns)) {
 557                 kiblnd_unlink_peer_locked(peer_ni);
 558         } else {
 559                 list_for_each_entry_safe(conn, cnxt, &peer_ni->ibp_conns,
 560                                          ibc_list)
 561                         kiblnd_close_conn_locked(conn, 0);
 562                 /* NB closing peer_ni's last conn unlinked it. */
 563         }
 564         /* NB peer_ni now unlinked; might even be freed if the peer_ni table had the
 565          * last ref on it. */
 566 }
 567
 568 static int
 569 kiblnd_del_peer(struct lnet_ni *ni, lnet_nid_t nid)
 570 {
 571         LIST_HEAD(zombies);
 572         struct hlist_node *pnxt;
 573         struct kib_peer_ni *peer_ni;
 574         int lo;
 575         int hi;
 576         int i;
 577         unsigned long flags;
 578         int rc = -ENOENT;
 579
 580         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 581
 582         if (nid != LNET_NID_ANY) {
 583                 lo = hash_min(nid, HASH_BITS(kiblnd_data.kib_peers));
 584                 hi = lo;
 585         } else {
 586                 lo = 0;
 587                 hi = HASH_SIZE(kiblnd_data.kib_peers) - 1;
 588         }
 589
 590         for (i = lo; i <= hi; i++) {
 591                 hlist_for_each_entry_safe(peer_ni, pnxt,
 592                                           &kiblnd_data.kib_peers[i], ibp_list) {
 593                         LASSERT(!kiblnd_peer_idle(peer_ni));
 594
 595                         if (peer_ni->ibp_ni != ni)
 596                                 continue;
 597
 598                         if (!(nid == LNET_NID_ANY || peer_ni->ibp_nid == nid))
 599                                 continue;
 600
 601                         if (!list_empty(&peer_ni->ibp_tx_queue)) {
 602                                 LASSERT(list_empty(&peer_ni->ibp_conns));
 603
 604                                 list_splice_init(&peer_ni->ibp_tx_queue,
 605                                                  &zombies);
 606                         }
 607
 608                         kiblnd_del_peer_locked(peer_ni);
 609                         rc = 0;         /* matched something */
 610                 }
 611         }
 612
 613         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 614
 615         kiblnd_txlist_done(&zombies, -EIO, LNET_MSG_STATUS_LOCAL_ERROR);
 616
 617         return rc;
 618 }
 619
 620 static struct kib_conn *
 621 kiblnd_get_conn_by_idx(struct lnet_ni *ni, int index)
 622 {
 623         struct kib_peer_ni *peer_ni;
 624         struct kib_conn *conn;
 625         int i;
 626         unsigned long flags;
 627
 628         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 629
 630         hash_for_each(kiblnd_data.kib_peers, i, peer_ni, ibp_list) {
 631                 LASSERT(!kiblnd_peer_idle(peer_ni));
 632
 633                 if (peer_ni->ibp_ni != ni)
 634                         continue;
 635
 636                 list_for_each_entry(conn, &peer_ni->ibp_conns,
 637                                     ibc_list) {
 638                         if (index-- > 0)
 639                                 continue;
 640
 641                         kiblnd_conn_addref(conn);
 642                         read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
 643                                                flags);
 644                         return conn;
 645                 }
 646         }
 647
 648         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 649         return NULL;
 650 }
 651
 652 static void
 653 kiblnd_setup_mtu_locked(struct rdma_cm_id *cmid)
 654 {
 655         /* XXX There is no path record for iWARP, set by netdev->change_mtu? */
 656         if (cmid->route.path_rec == NULL)
 657                 return;
 658
 659         if (*kiblnd_tunables.kib_ib_mtu)
 660                 cmid->route.path_rec->mtu =
 661                         ib_mtu_int_to_enum(*kiblnd_tunables.kib_ib_mtu);
 662 }
 663
 664 static int
 665 kiblnd_get_completion_vector(struct kib_conn *conn, int cpt)
 666 {
 667         cpumask_var_t   *mask;
 668         int             vectors;
 669         int             off;
 670         int             i;
 671         lnet_nid_t      ibp_nid;
 672
 673         vectors = conn->ibc_cmid->device->num_comp_vectors;
 674         if (vectors <= 1)
 675                 return 0;
 676
 677         mask = cfs_cpt_cpumask(lnet_cpt_table(), cpt);
 678
 679         /* hash NID to CPU id in this partition... when targeting a single peer
 680          * with multiple QPs, to engage more cores in CQ processing to a single
 681          * peer, use ibp_nconns to salt the value the comp_vector value
 682          */
 683         ibp_nid = conn->ibc_peer->ibp_nid +
 684                 atomic_read(&conn->ibc_peer->ibp_nconns);
 685         off = do_div(ibp_nid, cpumask_weight(*mask));
 686         for_each_cpu(i, *mask) {
 687                 if (off-- == 0)
 688                         return i % vectors;
 689         }
 690
 691         LBUG();
 692         return 1;
 693 }
 694
 695 /*
 696  * Get the scheduler bound to this CPT. If the scheduler has no
 697  * threads, which means that the CPT has no CPUs, then grab the
 698  * next scheduler that we can use.
 699  *
 700  * This case would be triggered if a NUMA node is configured with
 701  * no associated CPUs.
 702  */
 703 static struct kib_sched_info *
 704 kiblnd_get_scheduler(int cpt)
 705 {
 706         struct kib_sched_info *sched;
 707         int i;
 708
 709         sched = kiblnd_data.kib_scheds[cpt];
 710
 711         if (sched->ibs_nthreads > 0)
 712                 return sched;
 713
 714         cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
 715                 if (sched->ibs_nthreads > 0) {
 716                         CDEBUG(D_NET, "scheduler[%d] has no threads. selected scheduler[%d]\n",
 717                                         cpt, sched->ibs_cpt);
 718                         return sched;
 719                 }
 720         }
 721
 722         return NULL;
 723 }
 724
 725 static unsigned int kiblnd_send_wrs(struct kib_conn *conn)
 726 {
 727         /*
 728          * One WR for the LNet message
 729          * And ibc_max_frags for the transfer WRs
 730          */
 731         int ret;
 732         int multiplier = 1 + conn->ibc_max_frags;
 733
 734         /* FastReg needs two extra WRs for map and invalidate */
 735         if (IS_FAST_REG_DEV(conn->ibc_hdev->ibh_dev))
 736                 multiplier += 2;
 737
 738         /* account for a maximum of ibc_queue_depth in-flight transfers */
 739         ret = multiplier * conn->ibc_queue_depth;
 740
 741         if (ret > conn->ibc_hdev->ibh_max_qp_wr) {
 742                 CDEBUG(D_NET, "peer_credits %u will result in send work "
 743                        "request size %d larger than maximum %d device "
 744                        "can handle\n", conn->ibc_queue_depth, ret,
 745                        conn->ibc_hdev->ibh_max_qp_wr);
 746                 conn->ibc_queue_depth =
 747                         conn->ibc_hdev->ibh_max_qp_wr / multiplier;
 748         }
 749
 750         /* don't go beyond the maximum the device can handle */
 751         return min(ret, conn->ibc_hdev->ibh_max_qp_wr);
 752 }
 753
 754 struct kib_conn *
 755 kiblnd_create_conn(struct kib_peer_ni *peer_ni, struct rdma_cm_id *cmid,
 756                    int state, int version)
 757 {
 758         /* CAVEAT EMPTOR:
 759          * If the new conn is created successfully it takes over the caller's
 760          * ref on 'peer_ni'.  It also "owns" 'cmid' and destroys it when it itself
 761          * is destroyed.  On failure, the caller's ref on 'peer_ni' remains and
 762          * she must dispose of 'cmid'.  (Actually I'd block forever if I tried
 763          * to destroy 'cmid' here since I'm called from the CM which still has
 764          * its ref on 'cmid'). */
 765         rwlock_t               *glock = &kiblnd_data.kib_global_lock;
 766         struct kib_net              *net = peer_ni->ibp_ni->ni_data;
 767         struct kib_dev *dev;
 768         struct ib_qp_init_attr init_qp_attr = {};
 769         struct kib_sched_info   *sched;
 770 #ifdef HAVE_IB_CQ_INIT_ATTR
 771         struct ib_cq_init_attr  cq_attr = {};
 772 #endif
 773         struct kib_conn *conn;
 774         struct ib_cq            *cq;
 775         unsigned long           flags;
 776         int                     cpt;
 777         int                     rc;
 778         int                     i;
 779
 780         LASSERT(net != NULL);
 781         LASSERT(!in_interrupt());
 782
 783         dev = net->ibn_dev;
 784
 785         cpt = lnet_cpt_of_nid(peer_ni->ibp_nid, peer_ni->ibp_ni);
 786         sched = kiblnd_get_scheduler(cpt);
 787
 788         if (sched == NULL) {
 789                 CERROR("no schedulers available. node is unhealthy\n");
 790                 goto failed_0;
 791         }
 792
 793         /*
 794          * The cpt might have changed if we ended up selecting a non cpt
 795          * native scheduler. So use the scheduler's cpt instead.
 796          */
 797         cpt = sched->ibs_cpt;
 798
 799         LIBCFS_CPT_ALLOC(conn, lnet_cpt_table(), cpt, sizeof(*conn));
 800         if (conn == NULL) {
 801                 CERROR("Can't allocate connection for %s\n",
 802                        libcfs_nid2str(peer_ni->ibp_nid));
 803                 goto failed_0;
 804         }
 805
 806         conn->ibc_state = IBLND_CONN_INIT;
 807         conn->ibc_version = version;
 808         conn->ibc_peer = peer_ni;                       /* I take the caller's ref */
 809         cmid->context = conn;                   /* for future CM callbacks */
 810         conn->ibc_cmid = cmid;
 811         conn->ibc_max_frags = peer_ni->ibp_max_frags;
 812         conn->ibc_queue_depth = peer_ni->ibp_queue_depth;
 813         conn->ibc_rxs = NULL;
 814         conn->ibc_rx_pages = NULL;
 815
 816         INIT_LIST_HEAD(&conn->ibc_early_rxs);
 817         INIT_LIST_HEAD(&conn->ibc_tx_noops);
 818         INIT_LIST_HEAD(&conn->ibc_tx_queue);
 819         INIT_LIST_HEAD(&conn->ibc_tx_queue_rsrvd);
 820         INIT_LIST_HEAD(&conn->ibc_tx_queue_nocred);
 821         INIT_LIST_HEAD(&conn->ibc_active_txs);
 822         INIT_LIST_HEAD(&conn->ibc_zombie_txs);
 823         spin_lock_init(&conn->ibc_lock);
 824
 825         LIBCFS_CPT_ALLOC(conn->ibc_connvars, lnet_cpt_table(), cpt,
 826                          sizeof(*conn->ibc_connvars));
 827         if (conn->ibc_connvars == NULL) {
 828                 CERROR("Can't allocate in-progress connection state\n");
 829                 goto failed_2;
 830         }
 831
 832         write_lock_irqsave(glock, flags);
 833         if (dev->ibd_failover) {
 834                 write_unlock_irqrestore(glock, flags);
 835                 CERROR("%s: failover in progress\n", dev->ibd_ifname);
 836                 goto failed_2;
 837         }
 838
 839         if (dev->ibd_hdev->ibh_ibdev != cmid->device) {
 840                 /* wakeup failover thread and teardown connection */
 841                 if (kiblnd_dev_can_failover(dev)) {
 842                         list_add_tail(&dev->ibd_fail_list,
 843                                       &kiblnd_data.kib_failed_devs);
 844                         wake_up(&kiblnd_data.kib_failover_waitq);
 845                 }
 846
 847                 write_unlock_irqrestore(glock, flags);
 848                 CERROR("cmid HCA(%s), kib_dev(%s) need failover\n",
 849                        cmid->device->name, dev->ibd_ifname);
 850                 goto failed_2;
 851         }
 852
 853         kiblnd_hdev_addref_locked(dev->ibd_hdev);
 854         conn->ibc_hdev = dev->ibd_hdev;
 855
 856         kiblnd_setup_mtu_locked(cmid);
 857
 858         write_unlock_irqrestore(glock, flags);
 859
 860 #ifdef HAVE_IB_CQ_INIT_ATTR
 861         cq_attr.cqe = IBLND_CQ_ENTRIES(conn);
 862         cq_attr.comp_vector = kiblnd_get_completion_vector(conn, cpt);
 863         cq = ib_create_cq(cmid->device,
 864                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 865                           &cq_attr);
 866 #else
 867         cq = ib_create_cq(cmid->device,
 868                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 869                           IBLND_CQ_ENTRIES(conn),
 870                           kiblnd_get_completion_vector(conn, cpt));
 871 #endif
 872         if (IS_ERR(cq)) {
 873                 /*
 874                  * on MLX-5 (possibly MLX-4 as well) this error could be
 875                  * hit if the concurrent_sends and/or peer_tx_credits is set
 876                  * too high. Or due to an MLX-5 bug which tries to
 877                  * allocate 256kb via kmalloc for WR cookie array
 878                  */
 879                 CERROR("Failed to create CQ with %d CQEs: %ld\n",
 880                         IBLND_CQ_ENTRIES(conn), PTR_ERR(cq));
 881                 goto failed_2;
 882         }
 883
 884         conn->ibc_cq = cq;
 885
 886         rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 887         if (rc != 0) {
 888                 CERROR("Can't request completion notification: %d\n", rc);
 889                 goto failed_2;
 890         }
 891
 892         init_qp_attr.event_handler = kiblnd_qp_event;
 893         init_qp_attr.qp_context = conn;
 894         init_qp_attr.cap.max_send_sge = *kiblnd_tunables.kib_wrq_sge;
 895         init_qp_attr.cap.max_recv_sge = 1;
 896         init_qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 897         init_qp_attr.qp_type = IB_QPT_RC;
 898         init_qp_attr.send_cq = cq;
 899         init_qp_attr.recv_cq = cq;
 900
 901         if (peer_ni->ibp_queue_depth_mod &&
 902             peer_ni->ibp_queue_depth_mod < peer_ni->ibp_queue_depth) {
 903                 conn->ibc_queue_depth = peer_ni->ibp_queue_depth_mod;
 904                 CDEBUG(D_NET, "Use reduced queue depth %u (from %u)\n",
 905                        peer_ni->ibp_queue_depth_mod,
 906                        peer_ni->ibp_queue_depth);
 907         }
 908
 909         do {
 910                 /* kiblnd_send_wrs() can change the connection's queue depth if
 911                  * the maximum work requests for the device is maxed out
 912                  */
 913                 init_qp_attr.cap.max_send_wr = kiblnd_send_wrs(conn);
 914                 init_qp_attr.cap.max_recv_wr = IBLND_RECV_WRS(conn);
 915                 rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd,
 916                                     &init_qp_attr);
 917                 if (rc != -ENOMEM || conn->ibc_queue_depth < 2)
 918                         break;
 919                 conn->ibc_queue_depth--;
 920         } while (rc);
 921
 922         if (rc) {
 923                 CERROR("Can't create QP: %d, send_wr: %d, recv_wr: %d, "
 924                        "send_sge: %d, recv_sge: %d\n",
 925                        rc, init_qp_attr.cap.max_send_wr,
 926                        init_qp_attr.cap.max_recv_wr,
 927                        init_qp_attr.cap.max_send_sge,
 928                        init_qp_attr.cap.max_recv_sge);
 929                 goto failed_2;
 930         }
 931
 932         conn->ibc_sched = sched;
 933
 934         if (!peer_ni->ibp_queue_depth_mod &&
 935             conn->ibc_queue_depth != peer_ni->ibp_queue_depth) {
 936                 CWARN("peer %s - queue depth reduced from %u to %u"
 937                       "  to allow for qp creation\n",
 938                       libcfs_nid2str(peer_ni->ibp_nid),
 939                       peer_ni->ibp_queue_depth,
 940                       conn->ibc_queue_depth);
 941                 peer_ni->ibp_queue_depth_mod = conn->ibc_queue_depth;
 942         }
 943
 944         LIBCFS_CPT_ALLOC(conn->ibc_rxs, lnet_cpt_table(), cpt,
 945                          IBLND_RX_MSGS(conn) * sizeof(struct kib_rx));
 946         if (conn->ibc_rxs == NULL) {
 947                 CERROR("Cannot allocate RX buffers\n");
 948                 goto failed_2;
 949         }
 950
 951         rc = kiblnd_alloc_pages(&conn->ibc_rx_pages, cpt,
 952                                 IBLND_RX_MSG_PAGES(conn));
 953         if (rc != 0)
 954                 goto failed_2;
 955
 956         kiblnd_map_rx_descs(conn);
 957
 958         /* 1 ref for caller and each rxmsg */
 959         atomic_set(&conn->ibc_refcount, 1 + IBLND_RX_MSGS(conn));
 960         conn->ibc_nrx = IBLND_RX_MSGS(conn);
 961
 962         /* post receives */
 963         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
 964                 rc = kiblnd_post_rx(&conn->ibc_rxs[i], IBLND_POSTRX_NO_CREDIT);
 965                 if (rc != 0) {
 966                         CERROR("Can't post rxmsg: %d\n", rc);
 967
 968                         /* Make posted receives complete */
 969                         kiblnd_abort_receives(conn);
 970
 971                         /* correct # of posted buffers
 972                          * NB locking needed now I'm racing with completion */
 973                         spin_lock_irqsave(&sched->ibs_lock, flags);
 974                         conn->ibc_nrx -= IBLND_RX_MSGS(conn) - i;
 975                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
 976
 977                         /* cmid will be destroyed by CM(ofed) after cm_callback
 978                          * returned, so we can't refer it anymore
 979                          * (by kiblnd_connd()->kiblnd_destroy_conn) */
 980                         rdma_destroy_qp(conn->ibc_cmid);
 981                         conn->ibc_cmid = NULL;
 982
 983                         /* Drop my own and unused rxbuffer refcounts */
 984                         while (i++ <= IBLND_RX_MSGS(conn))
 985                                 kiblnd_conn_decref(conn);
 986
 987                         return NULL;
 988                 }
 989         }
 990
 991         /* Init successful! */
 992         LASSERT (state == IBLND_CONN_ACTIVE_CONNECT ||
 993                  state == IBLND_CONN_PASSIVE_WAIT);
 994         conn->ibc_state = state;
 995
 996         /* 1 more conn */
 997         atomic_inc(&peer_ni->ibp_nconns);
 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_0:
1005         return NULL;
1006 }
1007
1008 void
1009 kiblnd_destroy_conn(struct kib_conn *conn)
1010 {
1011         struct rdma_cm_id *cmid = conn->ibc_cmid;
1012         struct kib_peer_ni *peer_ni = conn->ibc_peer;
1013
1014         LASSERT (!in_interrupt());
1015         LASSERT (atomic_read(&conn->ibc_refcount) == 0);
1016         LASSERT(list_empty(&conn->ibc_early_rxs));
1017         LASSERT(list_empty(&conn->ibc_tx_noops));
1018         LASSERT(list_empty(&conn->ibc_tx_queue));
1019         LASSERT(list_empty(&conn->ibc_tx_queue_rsrvd));
1020         LASSERT(list_empty(&conn->ibc_tx_queue_nocred));
1021         LASSERT(list_empty(&conn->ibc_active_txs));
1022         LASSERT (conn->ibc_noops_posted == 0);
1023         LASSERT (conn->ibc_nsends_posted == 0);
1024
1025         switch (conn->ibc_state) {
1026         default:
1027                 /* conn must be completely disengaged from the network */
1028                 LBUG();
1029
1030         case IBLND_CONN_DISCONNECTED:
1031                 /* connvars should have been freed already */
1032                 LASSERT (conn->ibc_connvars == NULL);
1033                 break;
1034
1035         case IBLND_CONN_INIT:
1036                 break;
1037         }
1038
1039         /* conn->ibc_cmid might be destroyed by CM already */
1040         if (cmid != NULL && cmid->qp != NULL)
1041                 rdma_destroy_qp(cmid);
1042
1043         if (conn->ibc_cq)
1044                 ib_destroy_cq(conn->ibc_cq);
1045
1046         kiblnd_txlist_done(&conn->ibc_zombie_txs, -ECONNABORTED,
1047                            LNET_MSG_STATUS_OK);
1048
1049         if (conn->ibc_rx_pages != NULL)
1050                 kiblnd_unmap_rx_descs(conn);
1051
1052         if (conn->ibc_rxs != NULL)
1053                 CFS_FREE_PTR_ARRAY(conn->ibc_rxs, IBLND_RX_MSGS(conn));
1054
1055         if (conn->ibc_connvars != NULL)
1056                 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
1057
1058         if (conn->ibc_hdev != NULL)
1059                 kiblnd_hdev_decref(conn->ibc_hdev);
1060
1061         /* See CAVEAT EMPTOR above in kiblnd_create_conn */
1062         if (conn->ibc_state != IBLND_CONN_INIT) {
1063                 struct kib_net *net = peer_ni->ibp_ni->ni_data;
1064
1065                 kiblnd_peer_decref(peer_ni);
1066                 rdma_destroy_id(cmid);
1067                 atomic_dec(&peer_ni->ibp_nconns);
1068                 atomic_dec(&net->ibn_nconns);
1069         }
1070 }
1071
1072 int
1073 kiblnd_close_peer_conns_locked(struct kib_peer_ni *peer_ni, int why)
1074 {
1075         struct kib_conn *conn;
1076         struct kib_conn *cnxt;
1077         int count = 0;
1078
1079         list_for_each_entry_safe(conn, cnxt, &peer_ni->ibp_conns,
1080                                  ibc_list) {
1081                 CDEBUG(D_NET, "Closing conn -> %s, "
1082                               "version: %x, reason: %d\n",
1083                        libcfs_nid2str(peer_ni->ibp_nid),
1084                        conn->ibc_version, why);
1085
1086                 kiblnd_close_conn_locked(conn, why);
1087                 count++;
1088         }
1089
1090         return count;
1091 }
1092
1093 int
1094 kiblnd_close_stale_conns_locked(struct kib_peer_ni *peer_ni,
1095                                 int version, __u64 incarnation)
1096 {
1097         struct kib_conn *conn;
1098         struct kib_conn *cnxt;
1099         int count = 0;
1100
1101         list_for_each_entry_safe(conn, cnxt, &peer_ni->ibp_conns,
1102                                  ibc_list) {
1103                 if (conn->ibc_version     == version &&
1104                     conn->ibc_incarnation == incarnation)
1105                         continue;
1106
1107                 CDEBUG(D_NET, "Closing stale conn -> %s version: %x, "
1108                               "incarnation:%#llx(%x, %#llx)\n",
1109                        libcfs_nid2str(peer_ni->ibp_nid),
1110                        conn->ibc_version, conn->ibc_incarnation,
1111                        version, incarnation);
1112
1113                 kiblnd_close_conn_locked(conn, -ESTALE);
1114                 count++;
1115         }
1116
1117         return count;
1118 }
1119
1120 static int
1121 kiblnd_close_matching_conns(struct lnet_ni *ni, lnet_nid_t nid)
1122 {
1123         struct kib_peer_ni *peer_ni;
1124         struct hlist_node *pnxt;
1125         int lo;
1126         int hi;
1127         int i;
1128         unsigned long flags;
1129         int count = 0;
1130
1131         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1132
1133         if (nid != LNET_NID_ANY) {
1134                 lo = hash_min(nid, HASH_BITS(kiblnd_data.kib_peers));
1135                 hi = lo;
1136         } else {
1137                 lo = 0;
1138                 hi = HASH_SIZE(kiblnd_data.kib_peers) - 1;
1139         }
1140
1141         for (i = lo; i <= hi; i++) {
1142                 hlist_for_each_entry_safe(peer_ni, pnxt,
1143                                           &kiblnd_data.kib_peers[i], ibp_list) {
1144                         LASSERT(!kiblnd_peer_idle(peer_ni));
1145
1146                         if (peer_ni->ibp_ni != ni)
1147                                 continue;
1148
1149                         if (!(nid == LNET_NID_ANY || nid == peer_ni->ibp_nid))
1150                                 continue;
1151
1152                         count += kiblnd_close_peer_conns_locked(peer_ni, 0);
1153                 }
1154         }
1155
1156         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1157
1158         /* wildcards always succeed */
1159         if (nid == LNET_NID_ANY)
1160                 return 0;
1161
1162         return (count == 0) ? -ENOENT : 0;
1163 }
1164
1165 static int
1166 kiblnd_ctl(struct lnet_ni *ni, unsigned int cmd, void *arg)
1167 {
1168         struct libcfs_ioctl_data *data = arg;
1169         int                       rc = -EINVAL;
1170
1171         switch(cmd) {
1172         case IOC_LIBCFS_GET_PEER: {
1173                 lnet_nid_t   nid = 0;
1174                 int          count = 0;
1175
1176                 rc = kiblnd_get_peer_info(ni, data->ioc_nid, data->ioc_count,
1177                                           &nid, &count);
1178                 data->ioc_nid    = nid;
1179                 data->ioc_count  = count;
1180                 break;
1181         }
1182
1183         case IOC_LIBCFS_DEL_PEER: {
1184                 rc = kiblnd_del_peer(ni, data->ioc_nid);
1185                 break;
1186         }
1187         case IOC_LIBCFS_GET_CONN: {
1188                 struct kib_conn *conn;
1189
1190                 rc = 0;
1191                 conn = kiblnd_get_conn_by_idx(ni, data->ioc_count);
1192                 if (conn == NULL) {
1193                         rc = -ENOENT;
1194                         break;
1195                 }
1196
1197                 LASSERT(conn->ibc_cmid != NULL);
1198                 data->ioc_nid = conn->ibc_peer->ibp_nid;
1199                 if (conn->ibc_cmid->route.path_rec == NULL)
1200                         data->ioc_u32[0] = 0; /* iWarp has no path MTU */
1201                 else
1202                         data->ioc_u32[0] =
1203                         ib_mtu_enum_to_int(conn->ibc_cmid->route.path_rec->mtu);
1204                 kiblnd_conn_decref(conn);
1205                 break;
1206         }
1207         case IOC_LIBCFS_CLOSE_CONNECTION: {
1208                 rc = kiblnd_close_matching_conns(ni, data->ioc_nid);
1209                 break;
1210         }
1211
1212         default:
1213                 break;
1214         }
1215
1216         return rc;
1217 }
1218
1219 static const struct ln_key_list kiblnd_tunables_keys = {
1220         .lkl_maxattr                    = LNET_NET_O2IBLND_TUNABLES_ATTR_MAX,
1221         .lkl_list                       = {
1222                 [LNET_NET_O2IBLND_TUNABLES_ATTR_HIW_PEER_CREDITS]  = {
1223                         .lkp_value      = "peercredits_hiw",
1224                         .lkp_data_type  = NLA_U32
1225                 },
1226                 [LNET_NET_O2IBLND_TUNABLES_ATTR_MAP_ON_DEMAND]  = {
1227                         .lkp_value      = "map_on_demand",
1228                         .lkp_data_type  = NLA_FLAG
1229                 },
1230                 [LNET_NET_O2IBLND_TUNABLES_ATTR_CONCURRENT_SENDS]  = {
1231                         .lkp_value      = "concurrent_sends",
1232                         .lkp_data_type  = NLA_U32
1233                 },
1234                 [LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_POOL_SIZE]  = {
1235                         .lkp_value      = "fmr_pool_size",
1236                         .lkp_data_type  = NLA_U32
1237                 },
1238                 [LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_FLUSH_TRIGGER]  = {
1239                         .lkp_value      = "fmr_flush_trigger",
1240                         .lkp_data_type  = NLA_U32
1241                 },
1242                 [LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_CACHE]  = {
1243                         .lkp_value      = "fmr_cache",
1244                         .lkp_data_type  = NLA_U32
1245                 },
1246                 [LNET_NET_O2IBLND_TUNABLES_ATTR_NTX]  = {
1247                         .lkp_value      = "ntx",
1248                         .lkp_data_type  = NLA_U16
1249                 },
1250                 [LNET_NET_O2IBLND_TUNABLES_ATTR_CONNS_PER_PEER]  = {
1251                         .lkp_value      = "conns_per_peer",
1252                         .lkp_data_type  = NLA_U16
1253                 },
1254         },
1255 };
1256
1257 static int
1258 kiblnd_nl_set(int cmd, struct nlattr *attr, int type, void *data)
1259 {
1260         struct lnet_lnd_tunables *tunables = data;
1261         s64 num;
1262
1263         if (cmd != LNET_CMD_NETS)
1264                 return -EOPNOTSUPP;
1265
1266         if (nla_type(attr) != LN_SCALAR_ATTR_INT_VALUE)
1267                 return -EINVAL;
1268
1269         switch (type) {
1270         case LNET_NET_O2IBLND_TUNABLES_ATTR_HIW_PEER_CREDITS:
1271                 tunables->lnd_tun_u.lnd_o2ib.lnd_peercredits_hiw = nla_get_s64(attr);
1272                 break;
1273         case LNET_NET_O2IBLND_TUNABLES_ATTR_MAP_ON_DEMAND:
1274                 tunables->lnd_tun_u.lnd_o2ib.lnd_map_on_demand = nla_get_s64(attr);
1275                 break;
1276         case LNET_NET_O2IBLND_TUNABLES_ATTR_CONCURRENT_SENDS:
1277                 tunables->lnd_tun_u.lnd_o2ib.lnd_concurrent_sends = nla_get_s64(attr);
1278                 break;
1279         case LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_POOL_SIZE:
1280                 tunables->lnd_tun_u.lnd_o2ib.lnd_fmr_pool_size = nla_get_s64(attr);
1281                 break;
1282         case LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_FLUSH_TRIGGER:
1283                 tunables->lnd_tun_u.lnd_o2ib.lnd_fmr_flush_trigger = nla_get_s64(attr);
1284                 break;
1285         case LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_CACHE:
1286                 tunables->lnd_tun_u.lnd_o2ib.lnd_fmr_cache = nla_get_s64(attr);
1287                 break;
1288         case LNET_NET_O2IBLND_TUNABLES_ATTR_NTX:
1289                 tunables->lnd_tun_u.lnd_o2ib.lnd_ntx = nla_get_s64(attr);
1290                 break;
1291         case LNET_NET_O2IBLND_TUNABLES_ATTR_CONNS_PER_PEER:
1292                 num = nla_get_s64(attr);
1293                 clamp_t(s64, num, 1, 127);
1294                 tunables->lnd_tun_u.lnd_o2ib.lnd_conns_per_peer = num;
1295                 fallthrough;
1296         default:
1297                 break;
1298         }
1299
1300         return 0;
1301 }
1302
1303 static void
1304 kiblnd_free_pages(struct kib_pages *p)
1305 {
1306         int     npages = p->ibp_npages;
1307         int     i;
1308
1309         for (i = 0; i < npages; i++) {
1310                 if (p->ibp_pages[i] != NULL)
1311                         __free_page(p->ibp_pages[i]);
1312         }
1313
1314         LIBCFS_FREE(p, offsetof(struct kib_pages, ibp_pages[npages]));
1315 }
1316
1317 int
1318 kiblnd_alloc_pages(struct kib_pages **pp, int cpt, int npages)
1319 {
1320         struct kib_pages *p;
1321         int i;
1322
1323         LIBCFS_CPT_ALLOC(p, lnet_cpt_table(), cpt,
1324                          offsetof(struct kib_pages, ibp_pages[npages]));
1325         if (p == NULL) {
1326                 CERROR("Can't allocate descriptor for %d pages\n", npages);
1327                 return -ENOMEM;
1328         }
1329
1330         memset(p, 0, offsetof(struct kib_pages, ibp_pages[npages]));
1331         p->ibp_npages = npages;
1332
1333         for (i = 0; i < npages; i++) {
1334                 p->ibp_pages[i] = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1335                                                      GFP_NOFS);
1336                 if (p->ibp_pages[i] == NULL) {
1337                         CERROR("Can't allocate page %d of %d\n", i, npages);
1338                         kiblnd_free_pages(p);
1339                         return -ENOMEM;
1340                 }
1341         }
1342
1343         *pp = p;
1344         return 0;
1345 }
1346
1347 void
1348 kiblnd_unmap_rx_descs(struct kib_conn *conn)
1349 {
1350         struct kib_rx *rx;
1351         int       i;
1352
1353         LASSERT (conn->ibc_rxs != NULL);
1354         LASSERT (conn->ibc_hdev != NULL);
1355
1356         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
1357                 rx = &conn->ibc_rxs[i];
1358
1359                 LASSERT(rx->rx_nob >= 0); /* not posted */
1360
1361                 kiblnd_dma_unmap_single(conn->ibc_hdev->ibh_ibdev,
1362                                         KIBLND_UNMAP_ADDR(rx, rx_msgunmap,
1363                                                           rx->rx_msgaddr),
1364                                         IBLND_MSG_SIZE, DMA_FROM_DEVICE);
1365         }
1366
1367         kiblnd_free_pages(conn->ibc_rx_pages);
1368
1369         conn->ibc_rx_pages = NULL;
1370 }
1371
1372 void
1373 kiblnd_map_rx_descs(struct kib_conn *conn)
1374 {
1375         struct kib_rx *rx;
1376         struct page    *pg;
1377         int             pg_off;
1378         int             ipg;
1379         int             i;
1380
1381         for (pg_off = ipg = i = 0; i < IBLND_RX_MSGS(conn); i++) {
1382                 pg = conn->ibc_rx_pages->ibp_pages[ipg];
1383                 rx = &conn->ibc_rxs[i];
1384
1385                 rx->rx_conn = conn;
1386                 rx->rx_msg = (struct kib_msg *)(((char *)page_address(pg)) + pg_off);
1387
1388                 rx->rx_msgaddr =
1389                         kiblnd_dma_map_single(conn->ibc_hdev->ibh_ibdev,
1390                                               rx->rx_msg, IBLND_MSG_SIZE,
1391                                               DMA_FROM_DEVICE);
1392                 LASSERT(!kiblnd_dma_mapping_error(conn->ibc_hdev->ibh_ibdev,
1393                                                   rx->rx_msgaddr));
1394                 KIBLND_UNMAP_ADDR_SET(rx, rx_msgunmap, rx->rx_msgaddr);
1395
1396                 CDEBUG(D_NET, "rx %d: %p %#llx(%#llx)\n",
1397                        i, rx->rx_msg, rx->rx_msgaddr,
1398                        (__u64)(page_to_phys(pg) + pg_off));
1399
1400                 pg_off += IBLND_MSG_SIZE;
1401                 LASSERT(pg_off <= PAGE_SIZE);
1402
1403                 if (pg_off == PAGE_SIZE) {
1404                         pg_off = 0;
1405                         ipg++;
1406                         LASSERT(ipg <= IBLND_RX_MSG_PAGES(conn));
1407                 }
1408         }
1409 }
1410
1411 static void
1412 kiblnd_unmap_tx_pool(struct kib_tx_pool *tpo)
1413 {
1414         struct kib_hca_dev *hdev = tpo->tpo_hdev;
1415         struct kib_tx *tx;
1416         int i;
1417
1418         LASSERT (tpo->tpo_pool.po_allocated == 0);
1419
1420         if (hdev == NULL)
1421                 return;
1422
1423         for (i = 0; i < tpo->tpo_pool.po_size; i++) {
1424                 tx = &tpo->tpo_tx_descs[i];
1425                 kiblnd_dma_unmap_single(hdev->ibh_ibdev,
1426                                         KIBLND_UNMAP_ADDR(tx, tx_msgunmap,
1427                                                           tx->tx_msgaddr),
1428                                         IBLND_MSG_SIZE, DMA_TO_DEVICE);
1429         }
1430
1431         kiblnd_hdev_decref(hdev);
1432         tpo->tpo_hdev = NULL;
1433 }
1434
1435 static struct kib_hca_dev *
1436 kiblnd_current_hdev(struct kib_dev *dev)
1437 {
1438         struct kib_hca_dev *hdev;
1439         unsigned long  flags;
1440         int            i = 0;
1441
1442         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1443         while (dev->ibd_failover) {
1444                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1445                 if (i++ % 50 == 0)
1446                         CDEBUG(D_NET, "%s: Wait for failover\n",
1447                                dev->ibd_ifname);
1448                 schedule_timeout_interruptible(cfs_time_seconds(1) / 100);
1449
1450                 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1451         }
1452
1453         kiblnd_hdev_addref_locked(dev->ibd_hdev);
1454         hdev = dev->ibd_hdev;
1455
1456         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1457
1458         return hdev;
1459 }
1460
1461 static void
1462 kiblnd_map_tx_pool(struct kib_tx_pool *tpo)
1463 {
1464         struct kib_pages *txpgs = tpo->tpo_tx_pages;
1465         struct kib_pool *pool = &tpo->tpo_pool;
1466         struct kib_net      *net   = pool->po_owner->ps_net;
1467         struct kib_dev *dev;
1468         struct page *page;
1469         struct kib_tx *tx;
1470         int             page_offset;
1471         int             ipage;
1472         int             i;
1473
1474         LASSERT (net != NULL);
1475
1476         dev = net->ibn_dev;
1477
1478         /* pre-mapped messages are not bigger than 1 page */
1479         BUILD_BUG_ON(IBLND_MSG_SIZE > PAGE_SIZE);
1480
1481         /* No fancy arithmetic when we do the buffer calculations */
1482         BUILD_BUG_ON(PAGE_SIZE % IBLND_MSG_SIZE != 0);
1483
1484         tpo->tpo_hdev = kiblnd_current_hdev(dev);
1485
1486         for (ipage = page_offset = i = 0; i < pool->po_size; i++) {
1487                 page = txpgs->ibp_pages[ipage];
1488                 tx = &tpo->tpo_tx_descs[i];
1489
1490                 tx->tx_msg = (struct kib_msg *)(((char *)page_address(page)) +
1491                                                 page_offset);
1492
1493                 tx->tx_msgaddr = kiblnd_dma_map_single(tpo->tpo_hdev->ibh_ibdev,
1494                                                        tx->tx_msg,
1495                                                        IBLND_MSG_SIZE,
1496                                                        DMA_TO_DEVICE);
1497                 LASSERT(!kiblnd_dma_mapping_error(tpo->tpo_hdev->ibh_ibdev,
1498                                                   tx->tx_msgaddr));
1499                 KIBLND_UNMAP_ADDR_SET(tx, tx_msgunmap, tx->tx_msgaddr);
1500
1501                 list_add(&tx->tx_list, &pool->po_free_list);
1502
1503                 page_offset += IBLND_MSG_SIZE;
1504                 LASSERT(page_offset <= PAGE_SIZE);
1505
1506                 if (page_offset == PAGE_SIZE) {
1507                         page_offset = 0;
1508                         ipage++;
1509                         LASSERT(ipage <= txpgs->ibp_npages);
1510                 }
1511         }
1512 }
1513
1514 static void
1515 kiblnd_destroy_fmr_pool(struct kib_fmr_pool *fpo)
1516 {
1517         LASSERT(fpo->fpo_map_count == 0);
1518
1519 #ifdef HAVE_FMR_POOL_API
1520         if (fpo->fpo_is_fmr && fpo->fmr.fpo_fmr_pool) {
1521                 ib_destroy_fmr_pool(fpo->fmr.fpo_fmr_pool);
1522         } else
1523 #endif /* HAVE_FMR_POOL_API */
1524         {
1525                 struct kib_fast_reg_descriptor *frd, *tmp;
1526                 int i = 0;
1527
1528                 list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1529                                          frd_list) {
1530                         list_del(&frd->frd_list);
1531 #ifndef HAVE_IB_MAP_MR_SG
1532                         ib_free_fast_reg_page_list(frd->frd_frpl);
1533 #endif
1534                         ib_dereg_mr(frd->frd_mr);
1535                         LIBCFS_FREE(frd, sizeof(*frd));
1536                         i++;
1537                 }
1538                 if (i < fpo->fast_reg.fpo_pool_size)
1539                         CERROR("FastReg pool still has %d regions registered\n",
1540                                 fpo->fast_reg.fpo_pool_size - i);
1541         }
1542
1543         if (fpo->fpo_hdev)
1544                 kiblnd_hdev_decref(fpo->fpo_hdev);
1545
1546         LIBCFS_FREE(fpo, sizeof(*fpo));
1547 }
1548
1549 static void
1550 kiblnd_destroy_fmr_pool_list(struct list_head *head)
1551 {
1552         struct kib_fmr_pool *fpo, *tmp;
1553
1554         list_for_each_entry_safe(fpo, tmp, head, fpo_list) {
1555                 list_del(&fpo->fpo_list);
1556                 kiblnd_destroy_fmr_pool(fpo);
1557         }
1558 }
1559
1560 static int
1561 kiblnd_fmr_pool_size(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1562                      int ncpts)
1563 {
1564         int size = tunables->lnd_fmr_pool_size / ncpts;
1565
1566         return max(IBLND_FMR_POOL, size);
1567 }
1568
1569 static int
1570 kiblnd_fmr_flush_trigger(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1571                          int ncpts)
1572 {
1573         int size = tunables->lnd_fmr_flush_trigger / ncpts;
1574
1575         return max(IBLND_FMR_POOL_FLUSH, size);
1576 }
1577
1578 #ifdef HAVE_FMR_POOL_API
1579 static int kiblnd_alloc_fmr_pool(struct kib_fmr_poolset *fps,
1580                                  struct kib_fmr_pool *fpo)
1581 {
1582         struct ib_fmr_pool_param param = {
1583                 .max_pages_per_fmr = IBLND_MAX_RDMA_FRAGS,
1584                 .page_shift        = PAGE_SHIFT,
1585                 .access            = (IB_ACCESS_LOCAL_WRITE |
1586                                       IB_ACCESS_REMOTE_WRITE),
1587                 .pool_size         = fps->fps_pool_size,
1588                 .dirty_watermark   = fps->fps_flush_trigger,
1589                 .flush_function    = NULL,
1590                 .flush_arg         = NULL,
1591                 .cache             = !!fps->fps_cache };
1592         int rc = 0;
1593
1594         fpo->fmr.fpo_fmr_pool = ib_create_fmr_pool(fpo->fpo_hdev->ibh_pd,
1595                                                    &param);
1596         if (IS_ERR(fpo->fmr.fpo_fmr_pool)) {
1597                 rc = PTR_ERR(fpo->fmr.fpo_fmr_pool);
1598                 if (rc != -ENOSYS)
1599                         CERROR("Failed to create FMR pool: %d\n", rc);
1600                 else
1601                         CERROR("FMRs are not supported\n");
1602         }
1603         fpo->fpo_is_fmr = true;
1604
1605         return rc;
1606 }
1607 #endif /* HAVE_FMR_POOL_API */
1608
1609 static int kiblnd_alloc_freg_pool(struct kib_fmr_poolset *fps,
1610                                   struct kib_fmr_pool *fpo,
1611                                   enum kib_dev_caps dev_caps)
1612 {
1613         struct kib_fast_reg_descriptor *frd, *tmp;
1614         int i, rc;
1615
1616 #ifdef HAVE_FMR_POOL_API
1617         fpo->fpo_is_fmr = false;
1618 #endif
1619
1620         INIT_LIST_HEAD(&fpo->fast_reg.fpo_pool_list);
1621         fpo->fast_reg.fpo_pool_size = 0;
1622         for (i = 0; i < fps->fps_pool_size; i++) {
1623                 LIBCFS_CPT_ALLOC(frd, lnet_cpt_table(), fps->fps_cpt,
1624                                  sizeof(*frd));
1625                 if (!frd) {
1626                         CERROR("Failed to allocate a new fast_reg descriptor\n");
1627                         rc = -ENOMEM;
1628                         goto out;
1629                 }
1630                 frd->frd_mr = NULL;
1631
1632 #ifndef HAVE_IB_MAP_MR_SG
1633                 frd->frd_frpl = ib_alloc_fast_reg_page_list(fpo->fpo_hdev->ibh_ibdev,
1634                                                             IBLND_MAX_RDMA_FRAGS);
1635                 if (IS_ERR(frd->frd_frpl)) {
1636                         rc = PTR_ERR(frd->frd_frpl);
1637                         CERROR("Failed to allocate ib_fast_reg_page_list: %d\n",
1638                                 rc);
1639                         frd->frd_frpl = NULL;
1640                         goto out_middle;
1641                 }
1642 #endif
1643
1644 #ifdef HAVE_IB_ALLOC_FAST_REG_MR
1645                 frd->frd_mr = ib_alloc_fast_reg_mr(fpo->fpo_hdev->ibh_pd,
1646                                                    IBLND_MAX_RDMA_FRAGS);
1647 #else
1648                 /*
1649                  * it is expected to get here if this is an MLX-5 card.
1650                  * MLX-4 cards will always use FMR and MLX-5 cards will
1651                  * always use fast_reg. It turns out that some MLX-5 cards
1652                  * (possibly due to older FW versions) do not natively support
1653                  * gaps. So we will need to track them here.
1654                  */
1655                 frd->frd_mr = ib_alloc_mr(fpo->fpo_hdev->ibh_pd,
1656 #ifdef IB_MR_TYPE_SG_GAPS
1657                                           ((*kiblnd_tunables.kib_use_fastreg_gaps == 1) &&
1658                                            (dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT)) ?
1659                                                 IB_MR_TYPE_SG_GAPS :
1660                                                 IB_MR_TYPE_MEM_REG,
1661 #else
1662                                                 IB_MR_TYPE_MEM_REG,
1663 #endif
1664                                           IBLND_MAX_RDMA_FRAGS);
1665                 if ((*kiblnd_tunables.kib_use_fastreg_gaps == 1) &&
1666                     (dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT))
1667                         CWARN("using IB_MR_TYPE_SG_GAPS, expect a performance drop\n");
1668 #endif
1669                 if (IS_ERR(frd->frd_mr)) {
1670                         rc = PTR_ERR(frd->frd_mr);
1671                         CERROR("Failed to allocate ib_fast_reg_mr: %d\n", rc);
1672                         frd->frd_mr = NULL;
1673                         goto out_middle;
1674                 }
1675
1676                 /* indicate that the local invalidate needs to be generated */
1677                 frd->frd_valid = false;
1678
1679                 list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1680                 fpo->fast_reg.fpo_pool_size++;
1681         }
1682
1683         return 0;
1684
1685 out_middle:
1686         if (frd->frd_mr)
1687                 ib_dereg_mr(frd->frd_mr);
1688 #ifndef HAVE_IB_MAP_MR_SG
1689         if (frd->frd_frpl)
1690                 ib_free_fast_reg_page_list(frd->frd_frpl);
1691 #endif
1692         LIBCFS_FREE(frd, sizeof(*frd));
1693
1694 out:
1695         list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1696                                  frd_list) {
1697                 list_del(&frd->frd_list);
1698 #ifndef HAVE_IB_MAP_MR_SG
1699                 ib_free_fast_reg_page_list(frd->frd_frpl);
1700 #endif
1701                 ib_dereg_mr(frd->frd_mr);
1702                 LIBCFS_FREE(frd, sizeof(*frd));
1703         }
1704
1705         return rc;
1706 }
1707
1708 static int kiblnd_create_fmr_pool(struct kib_fmr_poolset *fps,
1709                                   struct kib_fmr_pool **pp_fpo)
1710 {
1711         struct kib_dev *dev = fps->fps_net->ibn_dev;
1712         struct kib_fmr_pool *fpo;
1713         int rc;
1714
1715         LIBCFS_CPT_ALLOC(fpo, lnet_cpt_table(), fps->fps_cpt, sizeof(*fpo));
1716         if (!fpo) {
1717                 return -ENOMEM;
1718         }
1719         memset(fpo, 0, sizeof(*fpo));
1720
1721         fpo->fpo_hdev = kiblnd_current_hdev(dev);
1722
1723 #ifdef HAVE_FMR_POOL_API
1724         if (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)
1725                 rc = kiblnd_alloc_fmr_pool(fps, fpo);
1726         else
1727 #endif /* HAVE_FMR_POOL_API */
1728                 rc = kiblnd_alloc_freg_pool(fps, fpo, dev->ibd_dev_caps);
1729         if (rc)
1730                 goto out_fpo;
1731
1732         fpo->fpo_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
1733         fpo->fpo_owner = fps;
1734         *pp_fpo = fpo;
1735
1736         return 0;
1737
1738 out_fpo:
1739         kiblnd_hdev_decref(fpo->fpo_hdev);
1740         LIBCFS_FREE(fpo, sizeof(*fpo));
1741         return rc;
1742 }
1743
1744 static void
1745 kiblnd_fail_fmr_poolset(struct kib_fmr_poolset *fps, struct list_head *zombies)
1746 {
1747         struct kib_fmr_pool *fpo;
1748
1749         if (fps->fps_net == NULL) /* intialized? */
1750                 return;
1751
1752         spin_lock(&fps->fps_lock);
1753
1754         while ((fpo = list_first_entry_or_null(&fps->fps_pool_list,
1755                                                struct kib_fmr_pool,
1756                                                fpo_list)) != NULL) {
1757                 fpo->fpo_failed = 1;
1758                 if (fpo->fpo_map_count == 0)
1759                         list_move(&fpo->fpo_list, zombies);
1760                 else
1761                         list_move(&fpo->fpo_list, &fps->fps_failed_pool_list);
1762         }
1763
1764         spin_unlock(&fps->fps_lock);
1765 }
1766
1767 static void
1768 kiblnd_fini_fmr_poolset(struct kib_fmr_poolset *fps)
1769 {
1770         if (fps->fps_net != NULL) { /* initialized? */
1771                 kiblnd_destroy_fmr_pool_list(&fps->fps_failed_pool_list);
1772                 kiblnd_destroy_fmr_pool_list(&fps->fps_pool_list);
1773         }
1774 }
1775
1776 static int
1777 kiblnd_init_fmr_poolset(struct kib_fmr_poolset *fps, int cpt, int ncpts,
1778                         struct kib_net *net,
1779                         struct lnet_ioctl_config_o2iblnd_tunables *tunables)
1780 {
1781         struct kib_fmr_pool *fpo;
1782         int rc;
1783
1784         memset(fps, 0, sizeof(struct kib_fmr_poolset));
1785
1786         fps->fps_net = net;
1787         fps->fps_cpt = cpt;
1788
1789         fps->fps_pool_size = kiblnd_fmr_pool_size(tunables, ncpts);
1790         fps->fps_flush_trigger = kiblnd_fmr_flush_trigger(tunables, ncpts);
1791         fps->fps_cache = tunables->lnd_fmr_cache;
1792
1793         spin_lock_init(&fps->fps_lock);
1794         INIT_LIST_HEAD(&fps->fps_pool_list);
1795         INIT_LIST_HEAD(&fps->fps_failed_pool_list);
1796
1797         rc = kiblnd_create_fmr_pool(fps, &fpo);
1798         if (rc == 0)
1799                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1800
1801         return rc;
1802 }
1803
1804 static int
1805 kiblnd_fmr_pool_is_idle(struct kib_fmr_pool *fpo, time64_t now)
1806 {
1807         if (fpo->fpo_map_count != 0) /* still in use */
1808                 return 0;
1809         if (fpo->fpo_failed)
1810                 return 1;
1811         return now >= fpo->fpo_deadline;
1812 }
1813
1814 #if defined(HAVE_FMR_POOL_API) || !defined(HAVE_IB_MAP_MR_SG)
1815 static int
1816 kiblnd_map_tx_pages(struct kib_tx *tx, struct kib_rdma_desc *rd)
1817 {
1818         struct kib_hca_dev *hdev;
1819         __u64           *pages = tx->tx_pages;
1820         int             npages;
1821         int             size;
1822         int             i;
1823
1824         hdev = tx->tx_pool->tpo_hdev;
1825
1826         for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
1827                 for (size = 0; size <  rd->rd_frags[i].rf_nob;
1828                         size += hdev->ibh_page_size) {
1829                         pages[npages++] = (rd->rd_frags[i].rf_addr &
1830                                            hdev->ibh_page_mask) + size;
1831                 }
1832         }
1833
1834         return npages;
1835 }
1836 #endif
1837
1838 void
1839 kiblnd_fmr_pool_unmap(struct kib_fmr *fmr, int status)
1840 {
1841         LIST_HEAD(zombies);
1842         struct kib_fmr_pool *fpo = fmr->fmr_pool;
1843         struct kib_fmr_poolset *fps;
1844         time64_t now = ktime_get_seconds();
1845         struct kib_fmr_pool *tmp;
1846
1847         if (!fpo)
1848                 return;
1849
1850         fps = fpo->fpo_owner;
1851
1852 #ifdef HAVE_FMR_POOL_API
1853         if (fpo->fpo_is_fmr) {
1854                 if (fmr->fmr_pfmr) {
1855                         ib_fmr_pool_unmap(fmr->fmr_pfmr);
1856                         fmr->fmr_pfmr = NULL;
1857                 }
1858
1859                 if (status) {
1860                         int rc = ib_flush_fmr_pool(fpo->fmr.fpo_fmr_pool);
1861                         LASSERT(!rc);
1862                 }
1863         } else
1864 #endif /* HAVE_FMR_POOL_API */
1865         {
1866                 struct kib_fast_reg_descriptor *frd = fmr->fmr_frd;
1867                 if (frd) {
1868                         frd->frd_posted = false;
1869                         fmr->fmr_frd = NULL;
1870                         spin_lock(&fps->fps_lock);
1871                         list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1872                         spin_unlock(&fps->fps_lock);
1873                 }
1874         }
1875         fmr->fmr_pool = NULL;
1876
1877         spin_lock(&fps->fps_lock);
1878         fpo->fpo_map_count--;   /* decref the pool */
1879
1880         list_for_each_entry_safe(fpo, tmp, &fps->fps_pool_list, fpo_list) {
1881                 /* the first pool is persistent */
1882                 if (fps->fps_pool_list.next == &fpo->fpo_list)
1883                         continue;
1884
1885                 if (kiblnd_fmr_pool_is_idle(fpo, now)) {
1886                         list_move(&fpo->fpo_list, &zombies);
1887                         fps->fps_version++;
1888                 }
1889         }
1890         spin_unlock(&fps->fps_lock);
1891
1892         if (!list_empty(&zombies))
1893                 kiblnd_destroy_fmr_pool_list(&zombies);
1894 }
1895
1896 int kiblnd_fmr_pool_map(struct kib_fmr_poolset *fps, struct kib_tx *tx,
1897                         struct kib_rdma_desc *rd, u32 nob, u64 iov,
1898                         struct kib_fmr *fmr)
1899 {
1900         struct kib_fmr_pool *fpo;
1901         __u64 version;
1902         bool is_rx = (rd != tx->tx_rd);
1903 #ifdef HAVE_FMR_POOL_API
1904         __u64 *pages = tx->tx_pages;
1905         bool tx_pages_mapped = false;
1906         int npages = 0;
1907 #endif
1908         int rc;
1909
1910 again:
1911         spin_lock(&fps->fps_lock);
1912         version = fps->fps_version;
1913         list_for_each_entry(fpo, &fps->fps_pool_list, fpo_list) {
1914                 fpo->fpo_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
1915                 fpo->fpo_map_count++;
1916
1917 #ifdef HAVE_FMR_POOL_API
1918                 fmr->fmr_pfmr = NULL;
1919                 if (fpo->fpo_is_fmr) {
1920                         struct ib_pool_fmr *pfmr;
1921
1922                         spin_unlock(&fps->fps_lock);
1923
1924                         if (!tx_pages_mapped) {
1925                                 npages = kiblnd_map_tx_pages(tx, rd);
1926                                 tx_pages_mapped = true;
1927                         }
1928
1929                         pfmr = kib_fmr_pool_map(fpo->fmr.fpo_fmr_pool,
1930                                                 pages, npages, iov);
1931                         if (likely(!IS_ERR(pfmr))) {
1932                                 fmr->fmr_key  = is_rx ? pfmr->fmr->rkey
1933                                         : pfmr->fmr->lkey;
1934                                 fmr->fmr_frd  = NULL;
1935                                 fmr->fmr_pfmr = pfmr;
1936                                 fmr->fmr_pool = fpo;
1937                                 return 0;
1938                         }
1939                         rc = PTR_ERR(pfmr);
1940                 } else
1941 #endif /* HAVE_FMR_POOL_API */
1942                 {
1943                         if (!list_empty(&fpo->fast_reg.fpo_pool_list)) {
1944                                 struct kib_fast_reg_descriptor *frd;
1945 #ifdef HAVE_IB_MAP_MR_SG
1946                                 struct ib_reg_wr *wr;
1947                                 int n;
1948 #else
1949                                 struct ib_rdma_wr *wr;
1950                                 struct ib_fast_reg_page_list *frpl;
1951 #endif
1952                                 struct ib_mr *mr;
1953
1954                                 frd = list_first_entry(
1955                                         &fpo->fast_reg.fpo_pool_list,
1956                                         struct kib_fast_reg_descriptor,
1957                                         frd_list);
1958                                 list_del(&frd->frd_list);
1959                                 spin_unlock(&fps->fps_lock);
1960
1961 #ifndef HAVE_IB_MAP_MR_SG
1962                                 frpl = frd->frd_frpl;
1963 #endif
1964                                 mr   = frd->frd_mr;
1965
1966                                 if (!frd->frd_valid) {
1967                                         struct ib_rdma_wr *inv_wr;
1968                                         __u32 key = is_rx ? mr->rkey : mr->lkey;
1969
1970                                         frd->frd_valid = true;
1971                                         inv_wr = &frd->frd_inv_wr;
1972                                         memset(inv_wr, 0, sizeof(*inv_wr));
1973
1974                                         inv_wr->wr.opcode = IB_WR_LOCAL_INV;
1975                                         inv_wr->wr.wr_id  = IBLND_WID_MR;
1976                                         inv_wr->wr.ex.invalidate_rkey = key;
1977
1978                                         /* Bump the key */
1979                                         key = ib_inc_rkey(key);
1980                                         ib_update_fast_reg_key(mr, key);
1981                                 }
1982
1983 #ifdef HAVE_IB_MAP_MR_SG
1984 #ifdef HAVE_IB_MAP_MR_SG_5ARGS
1985                                 n = ib_map_mr_sg(mr, tx->tx_frags,
1986                                                  rd->rd_nfrags, NULL, PAGE_SIZE);
1987 #else
1988                                 n = ib_map_mr_sg(mr, tx->tx_frags,
1989                                                  rd->rd_nfrags, PAGE_SIZE);
1990 #endif /* HAVE_IB_MAP_MR_SG_5ARGS */
1991                                 if (unlikely(n != rd->rd_nfrags)) {
1992                                         CERROR("Failed to map mr %d/%d elements\n",
1993                                                n, rd->rd_nfrags);
1994                                         return n < 0 ? n : -EINVAL;
1995                                 }
1996
1997                                 wr = &frd->frd_fastreg_wr;
1998                                 memset(wr, 0, sizeof(*wr));
1999
2000                                 wr->wr.opcode = IB_WR_REG_MR;
2001                                 wr->wr.wr_id  = IBLND_WID_MR;
2002                                 wr->wr.num_sge = 0;
2003                                 wr->wr.send_flags = 0;
2004                                 wr->mr = mr;
2005                                 wr->key = is_rx ? mr->rkey : mr->lkey;
2006                                 wr->access = (IB_ACCESS_LOCAL_WRITE |
2007                                               IB_ACCESS_REMOTE_WRITE);
2008 #else /* HAVE_IB_MAP_MR_SG */
2009                                 if (!tx_pages_mapped) {
2010                                         npages = kiblnd_map_tx_pages(tx, rd);
2011                                         tx_pages_mapped = true;
2012                                 }
2013
2014                                 LASSERT(npages <= frpl->max_page_list_len);
2015                                 memcpy(frpl->page_list, pages,
2016                                        sizeof(*pages) * npages);
2017
2018                                 /* Prepare FastReg WR */
2019                                 wr = &frd->frd_fastreg_wr;
2020                                 memset(wr, 0, sizeof(*wr));
2021
2022                                 wr->wr.opcode = IB_WR_FAST_REG_MR;
2023                                 wr->wr.wr_id  = IBLND_WID_MR;
2024
2025                                 wr->wr.wr.fast_reg.iova_start = iov;
2026                                 wr->wr.wr.fast_reg.page_list  = frpl;
2027                                 wr->wr.wr.fast_reg.page_list_len = npages;
2028                                 wr->wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2029                                 wr->wr.wr.fast_reg.length = nob;
2030                                 wr->wr.wr.fast_reg.rkey =
2031                                         is_rx ? mr->rkey : mr->lkey;
2032                                 wr->wr.wr.fast_reg.access_flags =
2033                                         (IB_ACCESS_LOCAL_WRITE |
2034                                          IB_ACCESS_REMOTE_WRITE);
2035 #endif /* HAVE_IB_MAP_MR_SG */
2036
2037                                 fmr->fmr_key  = is_rx ? mr->rkey : mr->lkey;
2038                                 fmr->fmr_frd  = frd;
2039                                 fmr->fmr_pool = fpo;
2040                                 frd->frd_posted = false;
2041                                 return 0;
2042                         }
2043                         spin_unlock(&fps->fps_lock);
2044                         rc = -EAGAIN;
2045                 }
2046
2047                 spin_lock(&fps->fps_lock);
2048                 fpo->fpo_map_count--;
2049                 if (rc != -EAGAIN) {
2050                         spin_unlock(&fps->fps_lock);
2051                         return rc;
2052                 }
2053
2054                 /* EAGAIN and ... */
2055                 if (version != fps->fps_version) {
2056                         spin_unlock(&fps->fps_lock);
2057                         goto again;
2058                 }
2059         }
2060
2061         if (fps->fps_increasing) {
2062                 spin_unlock(&fps->fps_lock);
2063                 CDEBUG(D_NET, "Another thread is allocating new "
2064                        "FMR pool, waiting for her to complete\n");
2065                 wait_var_event(fps, !fps->fps_increasing);
2066                 goto again;
2067
2068         }
2069
2070         if (ktime_get_seconds() < fps->fps_next_retry) {
2071                 /* someone failed recently */
2072                 spin_unlock(&fps->fps_lock);
2073                 return -EAGAIN;
2074         }
2075
2076         fps->fps_increasing = 1;
2077         spin_unlock(&fps->fps_lock);
2078
2079         CDEBUG(D_NET, "Allocate new FMR pool\n");
2080         rc = kiblnd_create_fmr_pool(fps, &fpo);
2081         spin_lock(&fps->fps_lock);
2082         fps->fps_increasing = 0;
2083         wake_up_var(fps);
2084         if (rc == 0) {
2085                 fps->fps_version++;
2086                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
2087         } else {
2088                 fps->fps_next_retry = ktime_get_seconds() + IBLND_POOL_RETRY;
2089         }
2090         spin_unlock(&fps->fps_lock);
2091
2092         goto again;
2093 }
2094
2095 static void
2096 kiblnd_fini_pool(struct kib_pool *pool)
2097 {
2098         LASSERT(list_empty(&pool->po_free_list));
2099         LASSERT(pool->po_allocated == 0);
2100
2101         CDEBUG(D_NET, "Finalize %s pool\n", pool->po_owner->ps_name);
2102 }
2103
2104 static void
2105 kiblnd_init_pool(struct kib_poolset *ps, struct kib_pool *pool, int size)
2106 {
2107         CDEBUG(D_NET, "Initialize %s pool\n", ps->ps_name);
2108
2109         memset(pool, 0, sizeof(struct kib_pool));
2110         INIT_LIST_HEAD(&pool->po_free_list);
2111         pool->po_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
2112         pool->po_owner = ps;
2113         pool->po_size = size;
2114 }
2115
2116 static void
2117 kiblnd_destroy_pool_list(struct list_head *head)
2118 {
2119         struct kib_pool *pool;
2120
2121         while ((pool = list_first_entry_or_null(head,
2122                                                 struct kib_pool,
2123                                                 po_list)) != NULL) {
2124                 list_del(&pool->po_list);
2125
2126                 LASSERT(pool->po_owner != NULL);
2127                 pool->po_owner->ps_pool_destroy(pool);
2128         }
2129 }
2130
2131 static void
2132 kiblnd_fail_poolset(struct kib_poolset *ps, struct list_head *zombies)
2133 {
2134         struct kib_pool *po;
2135
2136         if (ps->ps_net == NULL) /* intialized? */
2137                 return;
2138
2139         spin_lock(&ps->ps_lock);
2140         while ((po = list_first_entry_or_null(&ps->ps_pool_list,
2141                                               struct kib_pool,
2142                                               po_list)) != NULL) {
2143                 po->po_failed = 1;
2144                 if (po->po_allocated == 0)
2145                         list_move(&po->po_list, zombies);
2146                 else
2147                         list_move(&po->po_list, &ps->ps_failed_pool_list);
2148         }
2149         spin_unlock(&ps->ps_lock);
2150 }
2151
2152 static void
2153 kiblnd_fini_poolset(struct kib_poolset *ps)
2154 {
2155         if (ps->ps_net != NULL) { /* initialized? */
2156                 kiblnd_destroy_pool_list(&ps->ps_failed_pool_list);
2157                 kiblnd_destroy_pool_list(&ps->ps_pool_list);
2158         }
2159 }
2160
2161 static int
2162 kiblnd_init_poolset(struct kib_poolset *ps, int cpt,
2163                     struct kib_net *net, char *name, int size,
2164                     kib_ps_pool_create_t po_create,
2165                     kib_ps_pool_destroy_t po_destroy,
2166                     kib_ps_node_init_t nd_init,
2167                     kib_ps_node_fini_t nd_fini)
2168 {
2169         struct kib_pool *pool;
2170         int rc;
2171
2172         memset(ps, 0, sizeof(struct kib_poolset));
2173
2174         ps->ps_cpt          = cpt;
2175         ps->ps_net          = net;
2176         ps->ps_pool_create  = po_create;
2177         ps->ps_pool_destroy = po_destroy;
2178         ps->ps_node_init    = nd_init;
2179         ps->ps_node_fini    = nd_fini;
2180         ps->ps_pool_size    = size;
2181         if (strlcpy(ps->ps_name, name, sizeof(ps->ps_name))
2182             >= sizeof(ps->ps_name))
2183                 return -E2BIG;
2184         spin_lock_init(&ps->ps_lock);
2185         INIT_LIST_HEAD(&ps->ps_pool_list);
2186         INIT_LIST_HEAD(&ps->ps_failed_pool_list);
2187
2188         rc = ps->ps_pool_create(ps, size, &pool);
2189         if (rc == 0)
2190                 list_add(&pool->po_list, &ps->ps_pool_list);
2191         else
2192                 CERROR("Failed to create the first pool for %s\n", ps->ps_name);
2193
2194         return rc;
2195 }
2196
2197 static int
2198 kiblnd_pool_is_idle(struct kib_pool *pool, time64_t now)
2199 {
2200         if (pool->po_allocated != 0) /* still in use */
2201                 return 0;
2202         if (pool->po_failed)
2203                 return 1;
2204         return now >= pool->po_deadline;
2205 }
2206
2207 void
2208 kiblnd_pool_free_node(struct kib_pool *pool, struct list_head *node)
2209 {
2210         LIST_HEAD(zombies);
2211         struct kib_poolset *ps = pool->po_owner;
2212         struct kib_pool *tmp;
2213         time64_t now = ktime_get_seconds();
2214
2215         spin_lock(&ps->ps_lock);
2216
2217         if (ps->ps_node_fini != NULL)
2218                 ps->ps_node_fini(pool, node);
2219
2220         LASSERT(pool->po_allocated > 0);
2221         list_add(node, &pool->po_free_list);
2222         pool->po_allocated--;
2223
2224         list_for_each_entry_safe(pool, tmp, &ps->ps_pool_list, po_list) {
2225                 /* the first pool is persistent */
2226                 if (ps->ps_pool_list.next == &pool->po_list)
2227                         continue;
2228
2229                 if (kiblnd_pool_is_idle(pool, now))
2230                         list_move(&pool->po_list, &zombies);
2231         }
2232         spin_unlock(&ps->ps_lock);
2233
2234         if (!list_empty(&zombies))
2235                 kiblnd_destroy_pool_list(&zombies);
2236 }
2237
2238 struct list_head *
2239 kiblnd_pool_alloc_node(struct kib_poolset *ps)
2240 {
2241         struct list_head        *node;
2242         struct kib_pool *pool;
2243         int                     rc;
2244         unsigned int            interval = 1;
2245         ktime_t time_before;
2246         unsigned int trips = 0;
2247
2248 again:
2249         spin_lock(&ps->ps_lock);
2250         list_for_each_entry(pool, &ps->ps_pool_list, po_list) {
2251                 if (list_empty(&pool->po_free_list))
2252                         continue;
2253
2254                 pool->po_allocated++;
2255                 pool->po_deadline = ktime_get_seconds() +
2256                                     IBLND_POOL_DEADLINE;
2257                 node = pool->po_free_list.next;
2258                 list_del(node);
2259
2260                 if (ps->ps_node_init != NULL) {
2261                         /* still hold the lock */
2262                         ps->ps_node_init(pool, node);
2263                 }
2264                 spin_unlock(&ps->ps_lock);
2265                 return node;
2266         }
2267
2268         /* no available tx pool and ... */
2269         if (ps->ps_increasing) {
2270                 /* another thread is allocating a new pool */
2271                 spin_unlock(&ps->ps_lock);
2272                 trips++;
2273                 CDEBUG(D_NET,
2274                        "Another thread is allocating new %s pool, waiting %d jiffies for her to complete. trips = %d\n",
2275                        ps->ps_name, interval, trips);
2276
2277                 schedule_timeout_interruptible(interval);
2278                 if (interval < cfs_time_seconds(1))
2279                         interval *= 2;
2280
2281                 goto again;
2282         }
2283
2284         if (ktime_get_seconds() < ps->ps_next_retry) {
2285                 /* someone failed recently */
2286                 spin_unlock(&ps->ps_lock);
2287                 return NULL;
2288         }
2289
2290         ps->ps_increasing = 1;
2291         spin_unlock(&ps->ps_lock);
2292
2293         CDEBUG(D_NET, "%s pool exhausted, allocate new pool\n", ps->ps_name);
2294         time_before = ktime_get();
2295         rc = ps->ps_pool_create(ps, ps->ps_pool_size, &pool);
2296         CDEBUG(D_NET, "ps_pool_create took %lld ms to complete\n",
2297                ktime_ms_delta(ktime_get(), time_before));
2298
2299         spin_lock(&ps->ps_lock);
2300         ps->ps_increasing = 0;
2301         if (rc == 0) {
2302                 list_add_tail(&pool->po_list, &ps->ps_pool_list);
2303         } else {
2304                 ps->ps_next_retry = ktime_get_seconds() + IBLND_POOL_RETRY;
2305                 CERROR("Can't allocate new %s pool because out of memory\n",
2306                        ps->ps_name);
2307         }
2308         spin_unlock(&ps->ps_lock);
2309
2310         goto again;
2311 }
2312
2313 static void
2314 kiblnd_destroy_tx_pool(struct kib_pool *pool)
2315 {
2316         struct kib_tx_pool *tpo = container_of(pool, struct kib_tx_pool,
2317                                                tpo_pool);
2318         int i;
2319
2320         LASSERT (pool->po_allocated == 0);
2321
2322         if (tpo->tpo_tx_pages != NULL) {
2323                 kiblnd_unmap_tx_pool(tpo);
2324                 kiblnd_free_pages(tpo->tpo_tx_pages);
2325         }
2326
2327         if (tpo->tpo_tx_descs == NULL)
2328                 goto out;
2329
2330         for (i = 0; i < pool->po_size; i++) {
2331                 struct kib_tx *tx = &tpo->tpo_tx_descs[i];
2332                 int       wrq_sge = *kiblnd_tunables.kib_wrq_sge;
2333
2334                 list_del(&tx->tx_list);
2335                 if (tx->tx_pages != NULL)
2336                         CFS_FREE_PTR_ARRAY(tx->tx_pages, LNET_MAX_IOV);
2337                 if (tx->tx_frags != NULL)
2338                         CFS_FREE_PTR_ARRAY(tx->tx_frags,
2339                                            IBLND_MAX_RDMA_FRAGS);
2340                 if (tx->tx_wrq != NULL)
2341                         CFS_FREE_PTR_ARRAY(tx->tx_wrq,
2342                                            IBLND_MAX_RDMA_FRAGS);
2343                 if (tx->tx_sge != NULL) {
2344                         /* +1 is for the lnet header/message itself */
2345                         CFS_FREE_PTR_ARRAY(tx->tx_sge,
2346                                            (IBLND_MAX_RDMA_FRAGS *
2347                                            wrq_sge + 1));
2348                 }
2349                 if (tx->tx_rd != NULL)
2350                         LIBCFS_FREE(tx->tx_rd,
2351                                     offsetof(struct kib_rdma_desc,
2352                                              rd_frags[IBLND_MAX_RDMA_FRAGS]));
2353         }
2354
2355         CFS_FREE_PTR_ARRAY(tpo->tpo_tx_descs, pool->po_size);
2356 out:
2357         kiblnd_fini_pool(pool);
2358         CFS_FREE_PTR(tpo);
2359 }
2360
2361 static int kiblnd_tx_pool_size(struct lnet_ni *ni, int ncpts)
2362 {
2363         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2364         int ntx;
2365
2366         tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2367         ntx = tunables->lnd_ntx / ncpts;
2368
2369         return max(IBLND_TX_POOL, ntx);
2370 }
2371
2372 static int
2373 kiblnd_create_tx_pool(struct kib_poolset *ps, int size, struct kib_pool **pp_po)
2374 {
2375         int            i;
2376         int            npg;
2377         struct kib_pool *pool;
2378         struct kib_tx_pool *tpo;
2379
2380         LIBCFS_CPT_ALLOC(tpo, lnet_cpt_table(), ps->ps_cpt, sizeof(*tpo));
2381         if (tpo == NULL) {
2382                 CERROR("Failed to allocate TX pool\n");
2383                 return -ENOMEM;
2384         }
2385
2386         pool = &tpo->tpo_pool;
2387         kiblnd_init_pool(ps, pool, size);
2388         tpo->tpo_tx_descs = NULL;
2389         tpo->tpo_tx_pages = NULL;
2390
2391         npg = (size * IBLND_MSG_SIZE + PAGE_SIZE - 1) / PAGE_SIZE;
2392         if (kiblnd_alloc_pages(&tpo->tpo_tx_pages, ps->ps_cpt, npg) != 0) {
2393                 CERROR("Can't allocate tx pages: %d\n", npg);
2394                 CFS_FREE_PTR(tpo);
2395                 return -ENOMEM;
2396         }
2397
2398         LIBCFS_CPT_ALLOC(tpo->tpo_tx_descs, lnet_cpt_table(), ps->ps_cpt,
2399                          size * sizeof(struct kib_tx));
2400         if (tpo->tpo_tx_descs == NULL) {
2401                 CERROR("Can't allocate %d tx descriptors\n", size);
2402                 ps->ps_pool_destroy(pool);
2403                 return -ENOMEM;
2404         }
2405
2406         memset(tpo->tpo_tx_descs, 0, size * sizeof(struct kib_tx));
2407
2408         for (i = 0; i < size; i++) {
2409                 struct kib_tx *tx = &tpo->tpo_tx_descs[i];
2410                 int       wrq_sge = *kiblnd_tunables.kib_wrq_sge;
2411
2412                 tx->tx_pool = tpo;
2413                 if (ps->ps_net->ibn_fmr_ps != NULL) {
2414                         LIBCFS_CPT_ALLOC(tx->tx_pages,
2415                                          lnet_cpt_table(), ps->ps_cpt,
2416                                          LNET_MAX_IOV * sizeof(*tx->tx_pages));
2417                         if (tx->tx_pages == NULL)
2418                                 break;
2419                 }
2420
2421                 LIBCFS_CPT_ALLOC(tx->tx_frags, lnet_cpt_table(), ps->ps_cpt,
2422                                  IBLND_MAX_RDMA_FRAGS *
2423                                  sizeof(*tx->tx_frags));
2424                 if (tx->tx_frags == NULL)
2425                         break;
2426
2427                 sg_init_table(tx->tx_frags, IBLND_MAX_RDMA_FRAGS);
2428
2429                 LIBCFS_CPT_ALLOC(tx->tx_wrq, lnet_cpt_table(), ps->ps_cpt,
2430                                  IBLND_MAX_RDMA_FRAGS *
2431                                  sizeof(*tx->tx_wrq));
2432                 if (tx->tx_wrq == NULL)
2433                         break;
2434
2435                 /* +1 is for the lnet header/message itself */
2436                 LIBCFS_CPT_ALLOC(tx->tx_sge, lnet_cpt_table(), ps->ps_cpt,
2437                                  (IBLND_MAX_RDMA_FRAGS * wrq_sge + 1) *
2438                                  sizeof(*tx->tx_sge));
2439                 if (tx->tx_sge == NULL)
2440                         break;
2441
2442                 LIBCFS_CPT_ALLOC(tx->tx_rd, lnet_cpt_table(), ps->ps_cpt,
2443                                  offsetof(struct kib_rdma_desc,
2444                                           rd_frags[IBLND_MAX_RDMA_FRAGS]));
2445                 if (tx->tx_rd == NULL)
2446                         break;
2447         }
2448
2449         if (i == size) {
2450                 kiblnd_map_tx_pool(tpo);
2451                 *pp_po = pool;
2452                 return 0;
2453         }
2454
2455         ps->ps_pool_destroy(pool);
2456         return -ENOMEM;
2457 }
2458
2459 static void
2460 kiblnd_tx_init(struct kib_pool *pool, struct list_head *node)
2461 {
2462         struct kib_tx_poolset *tps = container_of(pool->po_owner,
2463                                                   struct kib_tx_poolset,
2464                                                   tps_poolset);
2465         struct kib_tx *tx  = list_entry(node, struct kib_tx, tx_list);
2466
2467         tx->tx_cookie = tps->tps_next_tx_cookie++;
2468 }
2469
2470 static void
2471 kiblnd_net_fini_pools(struct kib_net *net)
2472 {
2473         int     i;
2474
2475         cfs_cpt_for_each(i, lnet_cpt_table()) {
2476                 struct kib_tx_poolset *tps;
2477                 struct kib_fmr_poolset *fps;
2478
2479                 if (net->ibn_tx_ps != NULL) {
2480                         tps = net->ibn_tx_ps[i];
2481                         kiblnd_fini_poolset(&tps->tps_poolset);
2482                 }
2483
2484                 if (net->ibn_fmr_ps != NULL) {
2485                         fps = net->ibn_fmr_ps[i];
2486                         kiblnd_fini_fmr_poolset(fps);
2487                 }
2488         }
2489
2490         if (net->ibn_tx_ps != NULL) {
2491                 cfs_percpt_free(net->ibn_tx_ps);
2492                 net->ibn_tx_ps = NULL;
2493         }
2494
2495         if (net->ibn_fmr_ps != NULL) {
2496                 cfs_percpt_free(net->ibn_fmr_ps);
2497                 net->ibn_fmr_ps = NULL;
2498         }
2499 }
2500
2501 static int
2502 kiblnd_net_init_pools(struct kib_net *net, struct lnet_ni *ni, __u32 *cpts,
2503                       int ncpts)
2504 {
2505         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2506 #ifdef HAVE_IB_GET_DMA_MR
2507         unsigned long   flags;
2508 #endif
2509         int             cpt;
2510         int             rc;
2511         int             i;
2512
2513         tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2514
2515 #ifdef HAVE_IB_GET_DMA_MR
2516         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2517         /*
2518          * if lnd_map_on_demand is zero then we have effectively disabled
2519          * FMR or FastReg and we're using global memory regions
2520          * exclusively.
2521          */
2522         if (!tunables->lnd_map_on_demand) {
2523                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2524                                            flags);
2525                 goto create_tx_pool;
2526         }
2527
2528         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2529 #endif
2530
2531         if (tunables->lnd_fmr_pool_size < tunables->lnd_ntx / 4) {
2532                 CERROR("Can't set fmr pool size (%d) < ntx / 4(%d)\n",
2533                        tunables->lnd_fmr_pool_size,
2534                        tunables->lnd_ntx / 4);
2535                 rc = -EINVAL;
2536                 goto failed;
2537         }
2538
2539         /* TX pool must be created later than FMR, see LU-2268
2540          * for details */
2541         LASSERT(net->ibn_tx_ps == NULL);
2542
2543         /* premapping can fail if ibd_nmr > 1, so we always create
2544          * FMR pool and map-on-demand if premapping failed */
2545
2546         net->ibn_fmr_ps = cfs_percpt_alloc(lnet_cpt_table(),
2547                                            sizeof(struct kib_fmr_poolset));
2548         if (net->ibn_fmr_ps == NULL) {
2549                 CERROR("Failed to allocate FMR pool array\n");
2550                 rc = -ENOMEM;
2551                 goto failed;
2552         }
2553
2554         for (i = 0; i < ncpts; i++) {
2555                 cpt = (cpts == NULL) ? i : cpts[i];
2556                 rc = kiblnd_init_fmr_poolset(net->ibn_fmr_ps[cpt], cpt, ncpts,
2557                                              net, tunables);
2558                 if (rc != 0) {
2559                         CERROR("Can't initialize FMR pool for CPT %d: %d\n",
2560                                cpt, rc);
2561                         goto failed;
2562                 }
2563         }
2564
2565         if (i > 0)
2566                 LASSERT(i == ncpts);
2567
2568 #ifdef HAVE_IB_GET_DMA_MR
2569  create_tx_pool:
2570 #endif
2571         net->ibn_tx_ps = cfs_percpt_alloc(lnet_cpt_table(),
2572                                           sizeof(struct kib_tx_poolset));
2573         if (net->ibn_tx_ps == NULL) {
2574                 CERROR("Failed to allocate tx pool array\n");
2575                 rc = -ENOMEM;
2576                 goto failed;
2577         }
2578
2579         for (i = 0; i < ncpts; i++) {
2580                 cpt = (cpts == NULL) ? i : cpts[i];
2581                 rc = kiblnd_init_poolset(&net->ibn_tx_ps[cpt]->tps_poolset,
2582                                          cpt, net, "TX",
2583                                          kiblnd_tx_pool_size(ni, ncpts),
2584                                          kiblnd_create_tx_pool,
2585                                          kiblnd_destroy_tx_pool,
2586                                          kiblnd_tx_init, NULL);
2587                 if (rc != 0) {
2588                         CERROR("Can't initialize TX pool for CPT %d: %d\n",
2589                                cpt, rc);
2590                         goto failed;
2591                 }
2592         }
2593
2594         return 0;
2595  failed:
2596         kiblnd_net_fini_pools(net);
2597         LASSERT(rc != 0);
2598         return rc;
2599 }
2600
2601 static int
2602 kiblnd_port_get_attr(struct kib_hca_dev *hdev)
2603 {
2604         struct ib_port_attr *port_attr;
2605         int rc;
2606         unsigned long flags;
2607         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2608
2609         LIBCFS_ALLOC(port_attr, sizeof(*port_attr));
2610         if (port_attr == NULL) {
2611                 CDEBUG(D_NETERROR, "Out of memory\n");
2612                 return -ENOMEM;
2613         }
2614
2615         rc = ib_query_port(hdev->ibh_ibdev, hdev->ibh_port, port_attr);
2616
2617         write_lock_irqsave(g_lock, flags);
2618
2619         if (rc == 0)
2620                 hdev->ibh_state = port_attr->state == IB_PORT_ACTIVE
2621                                  ? IBLND_DEV_PORT_ACTIVE
2622                                  : IBLND_DEV_PORT_DOWN;
2623
2624         write_unlock_irqrestore(g_lock, flags);
2625         LIBCFS_FREE(port_attr, sizeof(*port_attr));
2626
2627         if (rc != 0) {
2628                 CDEBUG(D_NETERROR, "Failed to query IB port: %d\n", rc);
2629                 return rc;
2630         }
2631         return 0;
2632 }
2633
2634 static inline void
2635 kiblnd_set_ni_fatal_on(struct kib_hca_dev *hdev, int val)
2636 {
2637         struct kib_net  *net;
2638         __u32 ni_state_before;
2639         bool update_ping_buf = false;
2640         struct lnet_ni *ni = NULL;
2641
2642         /* for health check */
2643         list_for_each_entry(net, &hdev->ibh_dev->ibd_nets, ibn_list) {
2644                 ni = net->ibn_ni;
2645                 if (val)
2646                         CDEBUG(D_NETERROR, "Fatal device error for NI %s\n",
2647                                         libcfs_nidstr(&ni->ni_nid));
2648                 ni_state_before = lnet_set_link_fatal_state(ni, val);
2649
2650                 if (!update_ping_buf &&
2651                     (ni->ni_state == LNET_NI_STATE_ACTIVE) &&
2652                     (val != ni_state_before) &&
2653                     (net->ibn_init == IBLND_INIT_ALL))
2654                         update_ping_buf = true;
2655         }
2656
2657         if (update_ping_buf)
2658                 lnet_mark_ping_buffer_for_update();
2659 }
2660
2661 static void
2662 kiblnd_event_handler(struct ib_event_handler *handler, struct ib_event *event)
2663 {
2664         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2665         struct kib_hca_dev  *hdev;
2666         unsigned long flags;
2667
2668         hdev = container_of(handler, struct kib_hca_dev, ibh_event_handler);
2669
2670         write_lock_irqsave(g_lock, flags);
2671
2672         switch (event->event) {
2673         case IB_EVENT_DEVICE_FATAL:
2674                 CDEBUG(D_NET, "IB device fatal\n");
2675                 hdev->ibh_state = IBLND_DEV_FATAL;
2676                 kiblnd_set_ni_fatal_on(hdev, 1);
2677                 break;
2678         case IB_EVENT_PORT_ACTIVE:
2679                 CDEBUG(D_NET, "IB port active\n");
2680                 if (event->element.port_num == hdev->ibh_port) {
2681                         hdev->ibh_state = IBLND_DEV_PORT_ACTIVE;
2682                         kiblnd_set_ni_fatal_on(hdev, 0);
2683                 }
2684                 break;
2685         case IB_EVENT_PORT_ERR:
2686                 CDEBUG(D_NET, "IB port err\n");
2687                 if (event->element.port_num == hdev->ibh_port) {
2688                         hdev->ibh_state = IBLND_DEV_PORT_DOWN;
2689                         kiblnd_set_ni_fatal_on(hdev, 1);
2690                 }
2691                 break;
2692         default:
2693                 break;
2694         }
2695         write_unlock_irqrestore(g_lock, flags);
2696 }
2697
2698 static int
2699 kiblnd_hdev_get_attr(struct kib_hca_dev *hdev)
2700 {
2701         struct ib_device_attr *dev_attr;
2702         int rc = 0;
2703         int rc2 = 0;
2704
2705         /* It's safe to assume a HCA can handle a page size
2706          * matching that of the native system */
2707         hdev->ibh_page_shift = PAGE_SHIFT;
2708         hdev->ibh_page_size  = 1 << PAGE_SHIFT;
2709         hdev->ibh_page_mask  = ~((__u64)hdev->ibh_page_size - 1);
2710
2711 #ifndef HAVE_IB_DEVICE_ATTRS
2712         LIBCFS_ALLOC(dev_attr, sizeof(*dev_attr));
2713         if (dev_attr == NULL) {
2714                 CERROR("Out of memory\n");
2715                 return -ENOMEM;
2716         }
2717
2718         rc = ib_query_device(hdev->ibh_ibdev, dev_attr);
2719         if (rc != 0) {
2720                 CERROR("Failed to query IB device: %d\n", rc);
2721                 goto out_clean_attr;
2722         }
2723 #else
2724         dev_attr = &hdev->ibh_ibdev->attrs;
2725 #endif
2726
2727         hdev->ibh_mr_size = dev_attr->max_mr_size;
2728         hdev->ibh_max_qp_wr = dev_attr->max_qp_wr;
2729
2730         /* Setup device Memory Registration capabilities */
2731 #ifdef HAVE_FMR_POOL_API
2732 #ifdef HAVE_IB_DEVICE_OPS
2733         if (hdev->ibh_ibdev->ops.alloc_fmr &&
2734             hdev->ibh_ibdev->ops.dealloc_fmr &&
2735             hdev->ibh_ibdev->ops.map_phys_fmr &&
2736             hdev->ibh_ibdev->ops.unmap_fmr) {
2737 #else
2738         if (hdev->ibh_ibdev->alloc_fmr &&
2739             hdev->ibh_ibdev->dealloc_fmr &&
2740             hdev->ibh_ibdev->map_phys_fmr &&
2741             hdev->ibh_ibdev->unmap_fmr) {
2742 #endif
2743                 LCONSOLE_INFO("Using FMR for registration\n");
2744                 hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FMR_ENABLED;
2745         } else
2746 #endif /* HAVE_FMR_POOL_API */
2747         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
2748                 LCONSOLE_INFO("Using FastReg for registration\n");
2749                 hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FASTREG_ENABLED;
2750 #ifndef HAVE_IB_ALLOC_FAST_REG_MR
2751 #ifdef IB_DEVICE_SG_GAPS_REG
2752                 if (dev_attr->device_cap_flags & IB_DEVICE_SG_GAPS_REG)
2753                         hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT;
2754 #endif
2755 #endif
2756         } else {
2757                 rc = -ENOSYS;
2758         }
2759
2760         rc2 = kiblnd_port_get_attr(hdev);
2761         if (rc2 != 0)
2762                 return rc2;
2763
2764         if (rc != 0)
2765                 rc = -EINVAL;
2766
2767 #ifndef HAVE_IB_DEVICE_ATTRS
2768 out_clean_attr:
2769         LIBCFS_FREE(dev_attr, sizeof(*dev_attr));
2770 #endif
2771
2772         if (rc == -ENOSYS)
2773                 CERROR("IB device does not support FMRs nor FastRegs, can't "
2774                        "register memory: %d\n", rc);
2775         else if (rc == -EINVAL)
2776                 CERROR("Invalid mr size: %#llx\n", hdev->ibh_mr_size);
2777         return rc;
2778 }
2779
2780 #ifdef HAVE_IB_GET_DMA_MR
2781 static void
2782 kiblnd_hdev_cleanup_mrs(struct kib_hca_dev *hdev)
2783 {
2784         if (hdev->ibh_mrs == NULL)
2785                 return;
2786
2787         ib_dereg_mr(hdev->ibh_mrs);
2788
2789         hdev->ibh_mrs = NULL;
2790 }
2791 #endif
2792
2793 void
2794 kiblnd_hdev_destroy(struct kib_hca_dev *hdev)
2795 {
2796         if (hdev->ibh_event_handler.device != NULL)
2797                 ib_unregister_event_handler(&hdev->ibh_event_handler);
2798
2799 #ifdef HAVE_IB_GET_DMA_MR
2800         kiblnd_hdev_cleanup_mrs(hdev);
2801 #endif
2802
2803         if (hdev->ibh_pd != NULL)
2804                 ib_dealloc_pd(hdev->ibh_pd);
2805
2806         if (hdev->ibh_cmid != NULL)
2807                 rdma_destroy_id(hdev->ibh_cmid);
2808
2809         LIBCFS_FREE(hdev, sizeof(*hdev));
2810 }
2811
2812 #ifdef HAVE_IB_GET_DMA_MR
2813 static int
2814 kiblnd_hdev_setup_mrs(struct kib_hca_dev *hdev)
2815 {
2816         struct ib_mr *mr;
2817         int           acflags = IB_ACCESS_LOCAL_WRITE |
2818                                 IB_ACCESS_REMOTE_WRITE;
2819
2820         mr = ib_get_dma_mr(hdev->ibh_pd, acflags);
2821         if (IS_ERR(mr)) {
2822                 CERROR("Failed ib_get_dma_mr: %ld\n", PTR_ERR(mr));
2823                 kiblnd_hdev_cleanup_mrs(hdev);
2824                 return PTR_ERR(mr);
2825         }
2826
2827         hdev->ibh_mrs = mr;
2828
2829         return 0;
2830 }
2831 #endif
2832
2833 static int
2834 kiblnd_dummy_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2835 {       /* DUMMY */
2836         return 0;
2837 }
2838
2839 static int
2840 kiblnd_dev_need_failover(struct kib_dev *dev, struct net *ns)
2841 {
2842         struct rdma_cm_id  *cmid;
2843         struct sockaddr_in  srcaddr;
2844         struct sockaddr_in  dstaddr;
2845         int                 rc;
2846
2847         if (dev->ibd_hdev == NULL || /* initializing */
2848             dev->ibd_hdev->ibh_cmid == NULL || /* listener is dead */
2849             *kiblnd_tunables.kib_dev_failover > 1) /* debugging */
2850                 return 1;
2851
2852         /* XXX: it's UGLY, but I don't have better way to find
2853          * ib-bonding HCA failover because:
2854          *
2855          * a. no reliable CM event for HCA failover...
2856          * b. no OFED API to get ib_device for current net_device...
2857          *
2858          * We have only two choices at this point:
2859          *
2860          * a. rdma_bind_addr(), it will conflict with listener cmid
2861          * b. rdma_resolve_addr() to zero addr */
2862         cmid = kiblnd_rdma_create_id(ns, kiblnd_dummy_callback, dev,
2863                                      RDMA_PS_TCP, IB_QPT_RC);
2864         if (IS_ERR(cmid)) {
2865                 rc = PTR_ERR(cmid);
2866                 CERROR("Failed to create cmid for failover: %d\n", rc);
2867                 return rc;
2868         }
2869
2870         memset(&srcaddr, 0, sizeof(srcaddr));
2871         srcaddr.sin_family      = AF_INET;
2872         srcaddr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2873
2874         memset(&dstaddr, 0, sizeof(dstaddr));
2875         dstaddr.sin_family = AF_INET;
2876         rc = rdma_resolve_addr(cmid, (struct sockaddr *)&srcaddr,
2877                                (struct sockaddr *)&dstaddr, 1);
2878         if (rc != 0 || cmid->device == NULL) {
2879                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2880                        dev->ibd_ifname, &dev->ibd_ifip,
2881                        cmid->device, rc);
2882                 rdma_destroy_id(cmid);
2883                 return rc;
2884         }
2885
2886         rc = dev->ibd_hdev->ibh_ibdev != cmid->device; /* true for failover */
2887         rdma_destroy_id(cmid);
2888         return rc;
2889 }
2890
2891 int
2892 kiblnd_dev_failover(struct kib_dev *dev, struct net *ns)
2893 {
2894         LIST_HEAD(zombie_tpo);
2895         LIST_HEAD(zombie_ppo);
2896         LIST_HEAD(zombie_fpo);
2897         struct rdma_cm_id  *cmid  = NULL;
2898         struct kib_hca_dev *hdev  = NULL;
2899         struct kib_hca_dev *old;
2900         struct ib_pd       *pd;
2901         struct kib_net *net;
2902         struct sockaddr_in  addr;
2903         struct net_device *netdev;
2904         unsigned long       flags;
2905         int                 rc = 0;
2906         int                 i;
2907         bool                set_fatal = true;
2908
2909         LASSERT(*kiblnd_tunables.kib_dev_failover > 1 ||
2910                 dev->ibd_can_failover ||
2911                 dev->ibd_hdev == NULL);
2912
2913         rc = kiblnd_dev_need_failover(dev, ns);
2914         if (rc <= 0)
2915                 goto out;
2916
2917         if (dev->ibd_hdev != NULL &&
2918             dev->ibd_hdev->ibh_cmid != NULL) {
2919                 /* XXX it's not good to close old listener at here,
2920                  * because we can fail to create new listener.
2921                  * But we have to close it now, otherwise rdma_bind_addr
2922                  * will return EADDRINUSE... How crap! */
2923                 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2924
2925                 cmid = dev->ibd_hdev->ibh_cmid;
2926                 /* make next schedule of kiblnd_dev_need_failover()
2927                  * return 1 for me */
2928                 dev->ibd_hdev->ibh_cmid  = NULL;
2929                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2930
2931                 rdma_destroy_id(cmid);
2932         }
2933
2934         cmid = kiblnd_rdma_create_id(ns, kiblnd_cm_callback, dev, RDMA_PS_TCP,
2935                                      IB_QPT_RC);
2936         if (IS_ERR(cmid)) {
2937                 rc = PTR_ERR(cmid);
2938                 CERROR("Failed to create cmid for failover: %d\n", rc);
2939                 goto out;
2940         }
2941
2942         memset(&addr, 0, sizeof(addr));
2943         addr.sin_family      = AF_INET;
2944         addr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2945         addr.sin_port        = htons(*kiblnd_tunables.kib_service);
2946
2947         /* Bind to failover device or port */
2948         rc = rdma_bind_addr(cmid, (struct sockaddr *)&addr);
2949         if (rc != 0 || cmid->device == NULL) {
2950                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2951                        dev->ibd_ifname, &dev->ibd_ifip,
2952                        cmid->device, rc);
2953                 if (!rc && !cmid->device)
2954                         set_fatal = false;
2955                 rdma_destroy_id(cmid);
2956                 goto out;
2957         }
2958
2959         LIBCFS_ALLOC(hdev, sizeof(*hdev));
2960         if (hdev == NULL) {
2961                 CERROR("Failed to allocate kib_hca_dev\n");
2962                 rdma_destroy_id(cmid);
2963                 rc = -ENOMEM;
2964                 goto out;
2965         }
2966
2967         atomic_set(&hdev->ibh_ref, 1);
2968         hdev->ibh_dev   = dev;
2969         hdev->ibh_cmid  = cmid;
2970         hdev->ibh_ibdev = cmid->device;
2971         hdev->ibh_port  = cmid->port_num;
2972
2973 #ifdef HAVE_IB_ALLOC_PD_2ARGS
2974         pd = ib_alloc_pd(cmid->device, 0);
2975 #else
2976         pd = ib_alloc_pd(cmid->device);
2977 #endif
2978         if (IS_ERR(pd)) {
2979                 rc = PTR_ERR(pd);
2980                 CERROR("Can't allocate PD: %d\n", rc);
2981                 goto out;
2982         }
2983
2984         hdev->ibh_pd = pd;
2985
2986         rc = rdma_listen(cmid, 0);
2987         if (rc != 0) {
2988                 CERROR("Can't start new listener: %d\n", rc);
2989                 goto out;
2990         }
2991
2992         rc = kiblnd_hdev_get_attr(hdev);
2993         if (rc != 0) {
2994                 CERROR("Can't get device attributes: %d\n", rc);
2995                 goto out;
2996         }
2997
2998 #ifdef HAVE_IB_GET_DMA_MR
2999         rc = kiblnd_hdev_setup_mrs(hdev);
3000         if (rc != 0) {
3001                 CERROR("Can't setup device: %d\n", rc);
3002                 goto out;
3003         }
3004 #endif
3005
3006         INIT_IB_EVENT_HANDLER(&hdev->ibh_event_handler,
3007                                 hdev->ibh_ibdev, kiblnd_event_handler);
3008         ib_register_event_handler(&hdev->ibh_event_handler);
3009
3010         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3011
3012         old = dev->ibd_hdev;
3013         dev->ibd_hdev = hdev;   /* take over the refcount */
3014         hdev = old;
3015
3016         list_for_each_entry(net, &dev->ibd_nets, ibn_list) {
3017                 cfs_cpt_for_each(i, lnet_cpt_table()) {
3018                         kiblnd_fail_poolset(&net->ibn_tx_ps[i]->tps_poolset,
3019                                             &zombie_tpo);
3020
3021                         if (net->ibn_fmr_ps != NULL)
3022                                 kiblnd_fail_fmr_poolset(net->ibn_fmr_ps[i],
3023                                                         &zombie_fpo);
3024                 }
3025         }
3026
3027         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3028  out:
3029         if (!list_empty(&zombie_tpo))
3030                 kiblnd_destroy_pool_list(&zombie_tpo);
3031         if (!list_empty(&zombie_ppo))
3032                 kiblnd_destroy_pool_list(&zombie_ppo);
3033         if (!list_empty(&zombie_fpo))
3034                 kiblnd_destroy_fmr_pool_list(&zombie_fpo);
3035         if (hdev != NULL)
3036                 kiblnd_hdev_decref(hdev);
3037
3038         if (rc != 0) {
3039                 dev->ibd_failed_failover++;
3040         } else {
3041                 dev->ibd_failed_failover = 0;
3042
3043                 if (set_fatal) {
3044                         rcu_read_lock();
3045                         netdev = dev_get_by_name_rcu(ns, dev->ibd_ifname);
3046                         if (netdev && (lnet_get_link_status(netdev) == 1))
3047                                 kiblnd_set_ni_fatal_on(dev->ibd_hdev, 0);
3048                         rcu_read_unlock();
3049                 }
3050         }
3051
3052         return rc;
3053 }
3054
3055 void
3056 kiblnd_destroy_dev(struct kib_dev *dev)
3057 {
3058         LASSERT(dev->ibd_nnets == 0);
3059         LASSERT(list_empty(&dev->ibd_nets));
3060
3061         list_del(&dev->ibd_fail_list);
3062         list_del(&dev->ibd_list);
3063
3064         if (dev->ibd_hdev != NULL)
3065                 kiblnd_hdev_decref(dev->ibd_hdev);
3066
3067         LIBCFS_FREE(dev, sizeof(*dev));
3068 }
3069
3070 static struct kib_dev *
3071 kiblnd_dev_search(char *ifname)
3072 {
3073         struct kib_dev *alias = NULL;
3074         struct kib_dev *dev;
3075         char *colon;
3076         char *colon2;
3077
3078         colon = strchr(ifname, ':');
3079         list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3080                 if (strcmp(&dev->ibd_ifname[0], ifname) == 0)
3081                         return dev;
3082
3083                 if (alias != NULL)
3084                         continue;
3085
3086                 colon2 = strchr(dev->ibd_ifname, ':');
3087                 if (colon != NULL)
3088                         *colon = 0;
3089                 if (colon2 != NULL)
3090                         *colon2 = 0;
3091
3092                 if (strcmp(&dev->ibd_ifname[0], ifname) == 0)
3093                         alias = dev;
3094
3095                 if (colon != NULL)
3096                         *colon = ':';
3097                 if (colon2 != NULL)
3098                         *colon2 = ':';
3099         }
3100         return alias;
3101 }
3102
3103 static int
3104 kiblnd_handle_link_state_change(struct net_device *dev,
3105                                 unsigned char operstate)
3106 {
3107         struct lnet_ni *ni = NULL;
3108         struct kib_dev *event_kibdev;
3109         struct kib_net *net;
3110         struct kib_net *cnxt;
3111         bool link_down = !(operstate == IF_OPER_UP);
3112         struct in_device *in_dev;
3113         bool found_ip = false;
3114         __u32 ni_state_before;
3115         bool update_ping_buf = false;
3116         int state;
3117         DECLARE_CONST_IN_IFADDR(ifa);
3118
3119         event_kibdev = kiblnd_dev_search(dev->name);
3120
3121         if (!event_kibdev)
3122                 goto out;
3123
3124         list_for_each_entry_safe(net, cnxt, &event_kibdev->ibd_nets, ibn_list) {
3125                 found_ip = false;
3126                 ni = net->ibn_ni;
3127
3128                 in_dev = __in_dev_get_rtnl(dev);
3129                 if (!in_dev) {
3130                         CDEBUG(D_NET, "Interface %s has no IPv4 status.\n",
3131                                dev->name);
3132                         ni_state_before = lnet_set_link_fatal_state(ni, 1);
3133                         goto ni_done;
3134                 }
3135                 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3136                         if (htonl(event_kibdev->ibd_ifip) == ifa->ifa_local)
3137                                 found_ip = true;
3138                 }
3139                 endfor_ifa(in_dev);
3140
3141                 if (!found_ip) {
3142                         CDEBUG(D_NET, "Interface %s has no matching ip\n",
3143                                dev->name);
3144                         ni_state_before = lnet_set_link_fatal_state(ni, 1);
3145                         goto ni_done;
3146                 }
3147
3148                 if (link_down) {
3149                         ni_state_before = lnet_set_link_fatal_state(ni, 1);
3150                 } else {
3151                         state = (lnet_get_link_status(dev) == 0);
3152                         ni_state_before = lnet_set_link_fatal_state(ni,
3153                                                                     state);
3154                 }
3155 ni_done:
3156                 if (!update_ping_buf &&
3157                     (ni->ni_state == LNET_NI_STATE_ACTIVE) &&
3158                     (atomic_read(&ni->ni_fatal_error_on) != ni_state_before) &&
3159                     (net->ibn_init == IBLND_INIT_ALL))
3160                         update_ping_buf = true;
3161         }
3162
3163         if (update_ping_buf)
3164                 lnet_mark_ping_buffer_for_update();
3165 out:
3166         return 0;
3167 }
3168
3169 static int
3170 kiblnd_handle_inetaddr_change(struct in_ifaddr *ifa, unsigned long event)
3171 {
3172         struct kib_dev *event_kibdev;
3173         struct kib_net *net;
3174         struct kib_net *cnxt;
3175         struct net_device *event_netdev = ifa->ifa_dev->dev;
3176         __u32 ni_state_before;
3177         bool update_ping_buf = false;
3178         struct lnet_ni *ni = NULL;
3179         bool link_down;
3180
3181         event_kibdev = kiblnd_dev_search(event_netdev->name);
3182
3183         if (!event_kibdev)
3184                 goto out;
3185
3186         if (htonl(event_kibdev->ibd_ifip) != ifa->ifa_local)
3187                 goto out;
3188
3189         list_for_each_entry_safe(net, cnxt, &event_kibdev->ibd_nets,
3190                                  ibn_list) {
3191                 ni = net->ibn_ni;
3192                 link_down = (event == NETDEV_DOWN);
3193                 ni_state_before = lnet_set_link_fatal_state(ni, link_down);
3194                 if (!update_ping_buf &&
3195                     (ni->ni_state == LNET_NI_STATE_ACTIVE) &&
3196                     ((event == NETDEV_DOWN) != ni_state_before) &&
3197                     (net->ibn_init == IBLND_INIT_ALL))
3198                         update_ping_buf = true;
3199         }
3200
3201         if (update_ping_buf)
3202                 lnet_mark_ping_buffer_for_update();
3203 out:
3204         return 0;
3205 }
3206
3207
3208 /************************************
3209  * Net device notifier event handler
3210  ************************************/
3211 static int kiblnd_device_event(struct notifier_block *unused,
3212                                  unsigned long event, void *ptr)
3213 {
3214         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3215         unsigned char operstate;
3216
3217         operstate = dev->operstate;
3218
3219         CDEBUG(D_NET, "devevent: status=%ld, iface=%s ifindex %d state %u\n",
3220                event, dev->name, dev->ifindex, operstate);
3221
3222         switch (event) {
3223         case NETDEV_UP:
3224         case NETDEV_DOWN:
3225         case NETDEV_CHANGE:
3226                 kiblnd_handle_link_state_change(dev, operstate);
3227                 break;
3228         }
3229
3230         return NOTIFY_OK;
3231 }
3232
3233 /************************************
3234  * Inetaddr notifier event handler
3235  ************************************/
3236 static int kiblnd_inetaddr_event(struct notifier_block *unused,
3237                                  unsigned long event, void *ptr)
3238 {
3239         struct in_ifaddr *ifa = ptr;
3240
3241         CDEBUG(D_NET, "addrevent: status %ld ip addr %pI4, netmask %pI4.\n",
3242                event, &ifa->ifa_address, &ifa->ifa_mask);
3243
3244         switch (event) {
3245         case NETDEV_UP:
3246         case NETDEV_DOWN:
3247         case NETDEV_CHANGE:
3248                 kiblnd_handle_inetaddr_change(ifa, event);
3249                 break;
3250
3251         }
3252         return NOTIFY_OK;
3253 }
3254
3255 static struct notifier_block kiblnd_dev_notifier_block = {
3256         .notifier_call = kiblnd_device_event,
3257 };
3258
3259 static struct notifier_block kiblnd_inetaddr_notifier_block = {
3260         .notifier_call = kiblnd_inetaddr_event,
3261 };
3262
3263 static void
3264 kiblnd_base_shutdown(void)
3265 {
3266         struct kib_sched_info *sched;
3267         struct kib_peer_ni *peer_ni;
3268         int i;
3269
3270         LASSERT(list_empty(&kiblnd_data.kib_devs));
3271
3272         CDEBUG(D_MALLOC, "before LND base cleanup: kmem %lld\n",
3273                libcfs_kmem_read());
3274
3275         if (kiblnd_data.kib_init == IBLND_INIT_ALL) {
3276                 unregister_netdevice_notifier(&kiblnd_dev_notifier_block);
3277                 unregister_inetaddr_notifier(&kiblnd_inetaddr_notifier_block);
3278         }
3279
3280         switch (kiblnd_data.kib_init) {
3281         default:
3282                 LBUG();
3283
3284         case IBLND_INIT_ALL:
3285         case IBLND_INIT_DATA:
3286                 hash_for_each(kiblnd_data.kib_peers, i, peer_ni, ibp_list)
3287                         LASSERT(0);
3288                 LASSERT(list_empty(&kiblnd_data.kib_connd_zombies));
3289                 LASSERT(list_empty(&kiblnd_data.kib_connd_conns));
3290                 LASSERT(list_empty(&kiblnd_data.kib_reconn_list));
3291                 LASSERT(list_empty(&kiblnd_data.kib_reconn_wait));
3292
3293                 /* flag threads to terminate; wake and wait for them to die */
3294                 kiblnd_data.kib_shutdown = 1;
3295
3296                 /* NB: we really want to stop scheduler threads net by net
3297                  * instead of the whole module, this should be improved
3298                  * with dynamic configuration LNet.
3299                  */
3300                 cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds)
3301                         wake_up_all(&sched->ibs_waitq);
3302
3303                 wake_up(&kiblnd_data.kib_connd_waitq);
3304                 wake_up(&kiblnd_data.kib_failover_waitq);
3305
3306                 wait_var_event_warning(&kiblnd_data.kib_nthreads,
3307                                        !atomic_read(&kiblnd_data.kib_nthreads),
3308                                        "Waiting for %d threads to terminate\n",
3309                                        atomic_read(&kiblnd_data.kib_nthreads));
3310                 fallthrough;
3311
3312         case IBLND_INIT_NOTHING:
3313                 break;
3314         }
3315
3316         if (kiblnd_data.kib_scheds != NULL)
3317                 cfs_percpt_free(kiblnd_data.kib_scheds);
3318
3319         CDEBUG(D_MALLOC, "after LND base cleanup: kmem %lld\n",
3320                libcfs_kmem_read());
3321
3322         kiblnd_data.kib_init = IBLND_INIT_NOTHING;
3323         module_put(THIS_MODULE);
3324 }
3325
3326 static void
3327 kiblnd_shutdown(struct lnet_ni *ni)
3328 {
3329         struct kib_net *net = ni->ni_data;
3330         rwlock_t     *g_lock = &kiblnd_data.kib_global_lock;
3331         unsigned long     flags;
3332
3333         LASSERT(kiblnd_data.kib_init == IBLND_INIT_ALL);
3334
3335         if (net == NULL)
3336                 goto out;
3337
3338         CDEBUG(D_MALLOC, "before LND net cleanup: kmem %lld\n",
3339                libcfs_kmem_read());
3340
3341         write_lock_irqsave(g_lock, flags);
3342         net->ibn_shutdown = 1;
3343         write_unlock_irqrestore(g_lock, flags);
3344
3345         switch (net->ibn_init) {
3346         default:
3347                 LBUG();
3348
3349         case IBLND_INIT_ALL:
3350                 /* nuke all existing peers within this net */
3351                 kiblnd_del_peer(ni, LNET_NID_ANY);
3352
3353                 /* Wait for all peer_ni state to clean up */
3354                 wait_var_event_warning(&net->ibn_npeers,
3355                                        atomic_read(&net->ibn_npeers) == 0,
3356                                        "%s: waiting for %d peers to disconnect\n",
3357                                        libcfs_nidstr(&ni->ni_nid),
3358                                        atomic_read(&net->ibn_npeers));
3359
3360                 kiblnd_net_fini_pools(net);
3361
3362                 write_lock_irqsave(g_lock, flags);
3363                 LASSERT(net->ibn_dev->ibd_nnets > 0);
3364                 net->ibn_dev->ibd_nnets--;
3365                 list_del(&net->ibn_list);
3366                 write_unlock_irqrestore(g_lock, flags);
3367
3368                 wake_up_all(&kiblnd_data.kib_connd_waitq);
3369                 wait_var_event_warning(&net->ibn_nconns,
3370                                        atomic_read(&net->ibn_nconns) == 0,
3371                                        "%s: waiting for %d conns to clean\n",
3372                                        libcfs_nidstr(&ni->ni_nid),
3373                                        atomic_read(&net->ibn_nconns));
3374                 fallthrough;
3375
3376         case IBLND_INIT_NOTHING:
3377                 LASSERT (atomic_read(&net->ibn_nconns) == 0);
3378
3379                 if (net->ibn_dev != NULL &&
3380                     net->ibn_dev->ibd_nnets == 0)
3381                         kiblnd_destroy_dev(net->ibn_dev);
3382
3383                 break;
3384         }
3385
3386         CDEBUG(D_MALLOC, "after LND net cleanup: kmem %lld\n",
3387                libcfs_kmem_read());
3388
3389         net->ibn_init = IBLND_INIT_NOTHING;
3390         ni->ni_data = NULL;
3391
3392         LIBCFS_FREE(net, sizeof(*net));
3393
3394 out:
3395         if (list_empty(&kiblnd_data.kib_devs))
3396                 kiblnd_base_shutdown();
3397 }
3398
3399 static int
3400 kiblnd_base_startup(struct net *ns)
3401 {
3402         struct kib_sched_info *sched;
3403         int rc;
3404         int i;
3405
3406         LASSERT(kiblnd_data.kib_init == IBLND_INIT_NOTHING);
3407
3408         if (!try_module_get(THIS_MODULE))
3409                 goto failed;
3410
3411         memset(&kiblnd_data, 0, sizeof(kiblnd_data)); /* zero pointers, flags etc */
3412
3413         rwlock_init(&kiblnd_data.kib_global_lock);
3414
3415         INIT_LIST_HEAD(&kiblnd_data.kib_devs);
3416         INIT_LIST_HEAD(&kiblnd_data.kib_failed_devs);
3417
3418         hash_init(kiblnd_data.kib_peers);
3419
3420         spin_lock_init(&kiblnd_data.kib_connd_lock);
3421         INIT_LIST_HEAD(&kiblnd_data.kib_connd_conns);
3422         INIT_LIST_HEAD(&kiblnd_data.kib_connd_waits);
3423         INIT_LIST_HEAD(&kiblnd_data.kib_connd_zombies);
3424         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_list);
3425         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_wait);
3426
3427         init_waitqueue_head(&kiblnd_data.kib_connd_waitq);
3428         init_waitqueue_head(&kiblnd_data.kib_failover_waitq);
3429
3430         kiblnd_data.kib_scheds = cfs_percpt_alloc(lnet_cpt_table(),
3431                                                   sizeof(*sched));
3432         if (kiblnd_data.kib_scheds == NULL)
3433                 goto failed;
3434
3435         cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
3436                 int     nthrs;
3437
3438                 spin_lock_init(&sched->ibs_lock);
3439                 INIT_LIST_HEAD(&sched->ibs_conns);
3440                 init_waitqueue_head(&sched->ibs_waitq);
3441
3442                 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
3443                 if (*kiblnd_tunables.kib_nscheds > 0) {
3444                         nthrs = min(nthrs, *kiblnd_tunables.kib_nscheds);
3445                 } else {
3446                         /* max to half of CPUs, another half is reserved for
3447                          * upper layer modules */
3448                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
3449                 }
3450
3451                 sched->ibs_nthreads_max = nthrs;
3452                 sched->ibs_cpt = i;
3453         }
3454
3455         kiblnd_data.kib_error_qpa.qp_state = IB_QPS_ERR;
3456
3457         /* lists/ptrs/locks initialised */
3458         kiblnd_data.kib_init = IBLND_INIT_DATA;
3459         /*****************************************************/
3460
3461         rc = kiblnd_thread_start(kiblnd_connd, NULL, "kiblnd_connd");
3462         if (rc != 0) {
3463                 CERROR("Can't spawn o2iblnd connd: %d\n", rc);
3464                 goto failed;
3465         }
3466
3467         if (*kiblnd_tunables.kib_dev_failover != 0)
3468                 rc = kiblnd_thread_start(kiblnd_failover_thread, ns,
3469                                          "kiblnd_failover");
3470
3471         if (rc != 0) {
3472                 CERROR("Can't spawn o2iblnd failover thread: %d\n", rc);
3473                 goto failed;
3474         }
3475
3476         register_netdevice_notifier(&kiblnd_dev_notifier_block);
3477         register_inetaddr_notifier(&kiblnd_inetaddr_notifier_block);
3478
3479         /* flag everything initialised */
3480         kiblnd_data.kib_init = IBLND_INIT_ALL;
3481         /*****************************************************/
3482
3483         return 0;
3484
3485  failed:
3486         kiblnd_base_shutdown();
3487         return -ENETDOWN;
3488 }
3489
3490 static int
3491 kiblnd_start_schedulers(struct kib_sched_info *sched)
3492 {
3493         int     rc = 0;
3494         int     nthrs;
3495         int     i;
3496
3497         if (sched->ibs_nthreads == 0) {
3498                 if (*kiblnd_tunables.kib_nscheds > 0) {
3499                         nthrs = sched->ibs_nthreads_max;
3500                 } else {
3501                         nthrs = cfs_cpt_weight(lnet_cpt_table(),
3502                                                sched->ibs_cpt);
3503                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
3504                         nthrs = min(IBLND_N_SCHED_HIGH, nthrs);
3505                 }
3506         } else {
3507                 LASSERT(sched->ibs_nthreads <= sched->ibs_nthreads_max);
3508                 /* increase one thread if there is new interface */
3509                 nthrs = (sched->ibs_nthreads < sched->ibs_nthreads_max);
3510         }
3511
3512         for (i = 0; i < nthrs; i++) {
3513                 long    id = KIB_THREAD_ID(sched->ibs_cpt, sched->ibs_nthreads + i);
3514
3515                 rc = kiblnd_thread_start(kiblnd_scheduler, (void *)id,
3516                                          "kiblnd_sd_%02ld_%02ld",
3517                                          KIB_THREAD_CPT(id), KIB_THREAD_TID(id));
3518                 if (rc == 0)
3519                         continue;
3520
3521                 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
3522                        sched->ibs_cpt, sched->ibs_nthreads + i, rc);
3523                 break;
3524         }
3525
3526         sched->ibs_nthreads += i;
3527         return rc;
3528 }
3529
3530 static int kiblnd_dev_start_threads(struct kib_dev *dev, bool newdev, u32 *cpts,
3531                                     int ncpts)
3532 {
3533         int     cpt;
3534         int     rc;
3535         int     i;
3536
3537         for (i = 0; i < ncpts; i++) {
3538                 struct kib_sched_info *sched;
3539
3540                 cpt = (cpts == NULL) ? i : cpts[i];
3541                 sched = kiblnd_data.kib_scheds[cpt];
3542
3543                 if (!newdev && sched->ibs_nthreads > 0)
3544                         continue;
3545
3546                 rc = kiblnd_start_schedulers(kiblnd_data.kib_scheds[cpt]);
3547                 if (rc != 0) {
3548                         CERROR("Failed to start scheduler threads for %s\n",
3549                                dev->ibd_ifname);
3550                         return rc;
3551                 }
3552         }
3553         return 0;
3554 }
3555
3556 static int
3557 kiblnd_startup(struct lnet_ni *ni)
3558 {
3559         char *ifname = NULL;
3560         struct lnet_inetdev *ifaces = NULL;
3561         struct kib_dev *ibdev = NULL;
3562         struct kib_net *net = NULL;
3563         unsigned long flags;
3564         int rc;
3565         int i;
3566         bool newdev;
3567         struct net_device *netdev;
3568
3569         LASSERT(ni->ni_net->net_lnd == &the_o2iblnd);
3570
3571         if (kiblnd_data.kib_init == IBLND_INIT_NOTHING) {
3572                 rc = kiblnd_base_startup(ni->ni_net_ns);
3573                 if (rc != 0)
3574                         return rc;
3575         }
3576
3577         LIBCFS_ALLOC(net, sizeof(*net));
3578         ni->ni_data = net;
3579         if (net == NULL) {
3580                 rc = -ENOMEM;
3581                 goto failed;
3582         }
3583
3584         net->ibn_ni = ni;
3585         net->ibn_incarnation = ktime_get_real_ns() / NSEC_PER_USEC;
3586
3587         kiblnd_tunables_setup(ni);
3588
3589         /* Multi-Rail wants each secondary
3590          * IP to be treated as an unique 'struct ni' interface.
3591          */
3592         if (ni->ni_interface != NULL) {
3593                 /* Use the IPoIB interface specified in 'networks=' */
3594                 ifname = ni->ni_interface;
3595         } else {
3596                 ifname = *kiblnd_tunables.kib_default_ipif;
3597                 rc = libcfs_strnid(&ni->ni_nid, ifname);
3598                 if (rc < 0 || ni->ni_nid.nid_type != O2IBLND)
3599                         memset(&ni->ni_nid, 0, sizeof(ni->ni_nid));
3600         }
3601
3602         if (strlen(ifname) >= sizeof(ibdev->ibd_ifname)) {
3603                 CERROR("IPoIB interface name too long: %s\n", ifname);
3604                 rc = -E2BIG;
3605                 goto failed;
3606         }
3607
3608         rc = lnet_inet_enumerate(&ifaces, ni->ni_net_ns, false);
3609         if (rc < 0)
3610                 goto failed;
3611
3612         i = lnet_inet_select(ni, ifaces, rc);
3613         if (i < 0)
3614                 goto failed;
3615
3616         if (nid_addr_is_set(&ni->ni_nid)) {
3617                 strscpy(ifname, ifaces[i].li_name, sizeof(ifname));
3618         } else if (strcmp(ifname, ifaces[i].li_name) != 0) {
3619                 CERROR("ko2iblnd: No matching interfaces\n");
3620                 rc = -ENOENT;
3621                 goto failed;
3622         }
3623
3624         ibdev = kiblnd_dev_search(ifname);
3625         newdev = ibdev == NULL;
3626         /* hmm...create kib_dev even for alias */
3627         if (ibdev == NULL || strcmp(&ibdev->ibd_ifname[0], ifname) != 0) {
3628                 LIBCFS_ALLOC(ibdev, sizeof(*ibdev));
3629                 if (!ibdev) {
3630                         rc = -ENOMEM;
3631                         goto failed;
3632                 }
3633
3634                 ibdev->ibd_ifip = ntohl(ifaces[i].li_ipaddr);
3635                 strlcpy(ibdev->ibd_ifname, ifaces[i].li_name,
3636                         sizeof(ibdev->ibd_ifname));
3637                 ibdev->ibd_can_failover = ifaces[i].li_iff_master;
3638
3639                 INIT_LIST_HEAD(&ibdev->ibd_nets);
3640                 INIT_LIST_HEAD(&ibdev->ibd_list); /* not yet in kib_devs */
3641                 INIT_LIST_HEAD(&ibdev->ibd_fail_list);
3642
3643                 /* initialize the device */
3644                 rc = kiblnd_dev_failover(ibdev, ni->ni_net_ns);
3645                 if (rc) {
3646                         CERROR("ko2iblnd: Can't initialize device: rc = %d\n",
3647                                rc);
3648                         goto failed;
3649                 }
3650
3651                 list_add_tail(&ibdev->ibd_list, &kiblnd_data.kib_devs);
3652         }
3653
3654         net->ibn_dev = ibdev;
3655         ni->ni_nid.nid_addr[0] = cpu_to_be32(ibdev->ibd_ifip);
3656         if (!ni->ni_interface) {
3657                 rc = lnet_ni_add_interface(ni, ifaces[i].li_name);
3658                 if (rc < 0)
3659                         CWARN("ko2iblnd failed to allocate ni_interface\n");
3660         }
3661         ni->ni_dev_cpt = ifaces[i].li_cpt;
3662
3663         rc = kiblnd_dev_start_threads(ibdev, newdev, ni->ni_cpts, ni->ni_ncpts);
3664         if (rc != 0)
3665                 goto failed;
3666
3667         rc = kiblnd_net_init_pools(net, ni, ni->ni_cpts, ni->ni_ncpts);
3668         if (rc != 0) {
3669                 CERROR("Failed to initialize NI pools: %d\n", rc);
3670                 goto failed;
3671         }
3672
3673         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3674         ibdev->ibd_nnets++;
3675         list_add_tail(&net->ibn_list, &ibdev->ibd_nets);
3676         /* for health check */
3677         if (ibdev->ibd_hdev->ibh_state == IBLND_DEV_PORT_DOWN)
3678                 kiblnd_set_ni_fatal_on(ibdev->ibd_hdev, 1);
3679
3680         rcu_read_lock();
3681         netdev = dev_get_by_name_rcu(ni->ni_net_ns, net->ibn_dev->ibd_ifname);
3682         if (((netdev->reg_state == NETREG_UNREGISTERING) ||
3683              (netdev->operstate != IF_OPER_UP)) ||
3684             (lnet_get_link_status(netdev) == 0)) {
3685                 kiblnd_set_ni_fatal_on(ibdev->ibd_hdev, 1);
3686         }
3687         rcu_read_unlock();
3688
3689         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3690
3691         net->ibn_init = IBLND_INIT_ALL;
3692
3693         return 0;
3694
3695 failed:
3696         if (net != NULL && net->ibn_dev == NULL && ibdev != NULL)
3697                 kiblnd_destroy_dev(ibdev);
3698
3699         kfree(ifaces);
3700         kiblnd_shutdown(ni);
3701
3702         CDEBUG(D_NET, "Configuration of device %s failed: rc = %d\n",
3703                ifname ? ifname : "", rc);
3704
3705         return -ENETDOWN;
3706 }
3707
3708 static const struct lnet_lnd the_o2iblnd = {
3709         .lnd_type       = O2IBLND,
3710         .lnd_startup    = kiblnd_startup,
3711         .lnd_shutdown   = kiblnd_shutdown,
3712         .lnd_ctl        = kiblnd_ctl,
3713         .lnd_send       = kiblnd_send,
3714         .lnd_recv       = kiblnd_recv,
3715         .lnd_get_dev_prio = kiblnd_get_dev_prio,
3716         .lnd_nl_set     = kiblnd_nl_set,
3717         .lnd_keys       = &kiblnd_tunables_keys,
3718 };
3719
3720 static void ko2inlnd_assert_wire_constants(void)
3721 {
3722         BUILD_BUG_ON(IBLND_MSG_MAGIC != 0x0be91b91);
3723         BUILD_BUG_ON(IBLND_MSG_VERSION_1 != 0x11);
3724         BUILD_BUG_ON(IBLND_MSG_VERSION_2 != 0x12);
3725         BUILD_BUG_ON(IBLND_MSG_VERSION != IBLND_MSG_VERSION_2);
3726
3727         BUILD_BUG_ON(IBLND_MSG_CONNREQ != 0xc0);
3728         BUILD_BUG_ON(IBLND_MSG_CONNACK != 0xc1);
3729         BUILD_BUG_ON(IBLND_MSG_NOOP != 0xd0);
3730         BUILD_BUG_ON(IBLND_MSG_IMMEDIATE != 0xd1);
3731         BUILD_BUG_ON(IBLND_MSG_PUT_REQ != 0xd2);
3732         BUILD_BUG_ON(IBLND_MSG_PUT_NAK != 0xd3);
3733         BUILD_BUG_ON(IBLND_MSG_PUT_ACK != 0xd4);
3734         BUILD_BUG_ON(IBLND_MSG_PUT_DONE != 0xd5);
3735         BUILD_BUG_ON(IBLND_MSG_GET_REQ != 0xd6);
3736         BUILD_BUG_ON(IBLND_MSG_GET_DONE != 0xd7);
3737
3738         BUILD_BUG_ON(IBLND_REJECT_CONN_RACE != 1);
3739         BUILD_BUG_ON(IBLND_REJECT_NO_RESOURCES != 2);
3740         BUILD_BUG_ON(IBLND_REJECT_FATAL != 3);
3741         BUILD_BUG_ON(IBLND_REJECT_CONN_UNCOMPAT != 4);
3742         BUILD_BUG_ON(IBLND_REJECT_CONN_STALE != 5);
3743         BUILD_BUG_ON(IBLND_REJECT_RDMA_FRAGS != 6);
3744         BUILD_BUG_ON(IBLND_REJECT_MSG_QUEUE_SIZE != 7);
3745         BUILD_BUG_ON(IBLND_REJECT_INVALID_SRV_ID != 8);
3746
3747         BUILD_BUG_ON((int)sizeof(struct kib_connparams) != 8);
3748         BUILD_BUG_ON((int)offsetof(struct kib_connparams, ibcp_queue_depth) != 0);
3749         BUILD_BUG_ON((int)sizeof(((struct kib_connparams *)0)->ibcp_queue_depth) != 2);
3750         BUILD_BUG_ON((int)offsetof(struct kib_connparams, ibcp_max_frags) != 2);
3751         BUILD_BUG_ON((int)sizeof(((struct kib_connparams *)0)->ibcp_max_frags) != 2);
3752         BUILD_BUG_ON((int)offsetof(struct kib_connparams, ibcp_max_msg_size) != 4);
3753         BUILD_BUG_ON((int)sizeof(((struct kib_connparams *)0)->ibcp_max_msg_size) != 4);
3754
3755         BUILD_BUG_ON((int)sizeof(struct kib_immediate_msg) != 72);
3756         BUILD_BUG_ON((int)offsetof(struct kib_immediate_msg, ibim_hdr) != 0);
3757         BUILD_BUG_ON((int)sizeof(((struct kib_immediate_msg *)0)->ibim_hdr) != 72);
3758         BUILD_BUG_ON((int)offsetof(struct kib_immediate_msg, ibim_payload) != 72);
3759         BUILD_BUG_ON((int)sizeof(((struct kib_immediate_msg *)0)->ibim_payload) != 0);
3760
3761         BUILD_BUG_ON((int)sizeof(struct kib_rdma_frag) != 12);
3762         BUILD_BUG_ON((int)offsetof(struct kib_rdma_frag, rf_nob) != 0);
3763         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_frag *)0)->rf_nob) != 4);
3764         BUILD_BUG_ON((int)offsetof(struct kib_rdma_frag, rf_addr) != 4);
3765         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_frag *)0)->rf_addr) != 8);
3766
3767         BUILD_BUG_ON((int)sizeof(struct kib_rdma_desc) != 8);
3768         BUILD_BUG_ON((int)offsetof(struct kib_rdma_desc, rd_key) != 0);
3769         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_desc *)0)->rd_key) != 4);
3770         BUILD_BUG_ON((int)offsetof(struct kib_rdma_desc, rd_nfrags) != 4);
3771         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_desc *)0)->rd_nfrags) != 4);
3772         BUILD_BUG_ON((int)offsetof(struct kib_rdma_desc, rd_frags) != 8);
3773         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_desc *)0)->rd_frags) != 0);
3774
3775         BUILD_BUG_ON((int)sizeof(struct kib_putreq_msg) != 80);
3776         BUILD_BUG_ON((int)offsetof(struct kib_putreq_msg, ibprm_hdr) != 0);
3777         BUILD_BUG_ON((int)sizeof(((struct kib_putreq_msg *)0)->ibprm_hdr) != 72);
3778         BUILD_BUG_ON((int)offsetof(struct kib_putreq_msg, ibprm_cookie) != 72);
3779         BUILD_BUG_ON((int)sizeof(((struct kib_putreq_msg *)0)->ibprm_cookie) != 8);
3780
3781         BUILD_BUG_ON((int)sizeof(struct kib_putack_msg) != 24);
3782         BUILD_BUG_ON((int)offsetof(struct kib_putack_msg, ibpam_src_cookie) != 0);
3783         BUILD_BUG_ON((int)sizeof(((struct kib_putack_msg *)0)->ibpam_src_cookie) != 8);
3784         BUILD_BUG_ON((int)offsetof(struct kib_putack_msg, ibpam_dst_cookie) != 8);
3785         BUILD_BUG_ON((int)sizeof(((struct kib_putack_msg *)0)->ibpam_dst_cookie) != 8);
3786         BUILD_BUG_ON((int)offsetof(struct kib_putack_msg, ibpam_rd) != 16);
3787         BUILD_BUG_ON((int)sizeof(((struct kib_putack_msg *)0)->ibpam_rd) != 8);
3788
3789         BUILD_BUG_ON((int)sizeof(struct kib_get_msg) != 88);
3790         BUILD_BUG_ON((int)offsetof(struct kib_get_msg, ibgm_hdr) != 0);
3791         BUILD_BUG_ON((int)sizeof(((struct kib_get_msg *)0)->ibgm_hdr) != 72);
3792         BUILD_BUG_ON((int)offsetof(struct kib_get_msg, ibgm_cookie) != 72);
3793         BUILD_BUG_ON((int)sizeof(((struct kib_get_msg *)0)->ibgm_cookie) != 8);
3794         BUILD_BUG_ON((int)offsetof(struct kib_get_msg, ibgm_rd) != 80);
3795         BUILD_BUG_ON((int)sizeof(((struct kib_get_msg *)0)->ibgm_rd) != 8);
3796
3797         BUILD_BUG_ON((int)sizeof(struct kib_completion_msg) != 12);
3798         BUILD_BUG_ON((int)offsetof(struct kib_completion_msg, ibcm_cookie) != 0);
3799         BUILD_BUG_ON((int)sizeof(((struct kib_completion_msg *)0)->ibcm_cookie) != 8);
3800         BUILD_BUG_ON((int)offsetof(struct kib_completion_msg, ibcm_status) != 8);
3801         BUILD_BUG_ON((int)sizeof(((struct kib_completion_msg *)0)->ibcm_status) != 4);
3802
3803         /* Checks for struct kib_msg */
3804         //BUILD_BUG_ON((int)sizeof(struct kib_msg) != 12);
3805         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_magic) != 0);
3806         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_magic) != 4);
3807         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_version) != 4);
3808         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_version) != 2);
3809         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_type) != 6);
3810         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_type) != 1);
3811         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_credits) != 7);
3812         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_credits) != 1);
3813         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_nob) != 8);
3814         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_nob) != 4);
3815         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_cksum) != 12);
3816         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_cksum) != 4);
3817         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_srcnid) != 16);
3818         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_srcnid) != 8);
3819         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_srcstamp) != 24);
3820         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_srcstamp) != 8);
3821         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_dstnid) != 32);
3822         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_dstnid) != 8);
3823         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_dststamp) != 40);
3824         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_dststamp) != 8);
3825
3826         /* Connparams */
3827         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.connparams.ibcp_queue_depth) != 48);
3828         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.connparams.ibcp_queue_depth) != 2);
3829         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.connparams.ibcp_max_frags) != 50);
3830         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.connparams.ibcp_max_frags) != 2);
3831         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.connparams.ibcp_max_msg_size) != 52);
3832         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.connparams.ibcp_max_msg_size) != 4);
3833
3834         /* Immediate message */
3835         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.immediate.ibim_hdr) != 48);
3836         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.immediate.ibim_hdr) != 72);
3837         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.immediate.ibim_payload) != 120);
3838         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.immediate.ibim_payload) != 0);
3839
3840         /* PUT req message */
3841         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putreq.ibprm_hdr) != 48);
3842         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putreq.ibprm_hdr) != 72);
3843         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putreq.ibprm_cookie) != 120);
3844         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putreq.ibprm_cookie) != 8);
3845
3846         /* Put ACK */
3847         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putack.ibpam_src_cookie) != 48);
3848         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putack.ibpam_src_cookie) != 8);
3849         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putack.ibpam_dst_cookie) != 56);
3850         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putack.ibpam_dst_cookie) != 8);
3851         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putack.ibpam_rd) != 64);
3852         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putack.ibpam_rd) != 8);
3853
3854         /* GET message */
3855         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.get.ibgm_hdr) != 48);
3856         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.get.ibgm_hdr) != 72);
3857         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.get.ibgm_cookie) != 120);
3858         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.get.ibgm_cookie) != 8);
3859         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.get.ibgm_rd) != 128);
3860         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.get.ibgm_rd) != 8);
3861
3862         /* Completion message */
3863         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.completion.ibcm_cookie) != 48);
3864         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.completion.ibcm_cookie) != 8);
3865         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.completion.ibcm_status) != 56);
3866         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.completion.ibcm_status) != 4);
3867
3868         /* Sanity checks */
3869         BUILD_BUG_ON(sizeof(struct kib_msg) > IBLND_MSG_SIZE);
3870         BUILD_BUG_ON(offsetof(struct kib_msg,
3871                      ibm_u.get.ibgm_rd.rd_frags[IBLND_MAX_RDMA_FRAGS]) >
3872                      IBLND_MSG_SIZE);
3873         BUILD_BUG_ON(offsetof(struct kib_msg,
3874                      ibm_u.putack.ibpam_rd.rd_frags[IBLND_MAX_RDMA_FRAGS]) >
3875                      IBLND_MSG_SIZE);
3876 }
3877
3878 static void __exit ko2iblnd_exit(void)
3879 {
3880         lnet_unregister_lnd(&the_o2iblnd);
3881 }
3882
3883 static int __init ko2iblnd_init(void)
3884 {
3885         int rc;
3886
3887         ko2inlnd_assert_wire_constants();
3888
3889         rc = kiblnd_tunables_init();
3890         if (rc != 0)
3891                 return rc;
3892
3893         lnet_register_lnd(&the_o2iblnd);
3894
3895         return 0;
3896 }
3897
3898 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3899 MODULE_DESCRIPTION("OpenIB gen2 LNet Network Driver");
3900 MODULE_VERSION("2.8.0");
3901 MODULE_LICENSE("GPL");
3902
3903 module_init(ko2iblnd_init);
3904 module_exit(ko2iblnd_exit);