drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, 2015, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lnet/klnds/o2iblnd/o2iblnd_cb.c
  37  *
  38  * Author: Eric Barton <eric@bartonsoftware.com>
  39  */
  40
  41 #include "o2iblnd.h"
  42
  43 static void kiblnd_peer_alive(kib_peer_t *peer);
  44 static void kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error);
  45 static void kiblnd_check_sends(kib_conn_t *conn);
  46 static void kiblnd_init_tx_msg(lnet_ni_t *ni, kib_tx_t *tx,
  47                                 int type, int body_nob);
  48 static int kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
  49                              int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie);
  50 static void kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn);
  51 static void kiblnd_queue_tx(kib_tx_t *tx, kib_conn_t *conn);
  52 static void kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx);
  53
  54 static void
  55 kiblnd_tx_done(lnet_ni_t *ni, kib_tx_t *tx)
  56 {
  57         lnet_msg_t *lntmsg[2];
  58         kib_net_t *net = ni->ni_data;
  59         int rc;
  60         int i;
  61
  62         LASSERT(net);
  63         LASSERT(!in_interrupt());
  64         LASSERT(!tx->tx_queued);               /* mustn't be queued for sending */
  65         LASSERT(!tx->tx_sending);         /* mustn't be awaiting sent callback */
  66         LASSERT(!tx->tx_waiting);             /* mustn't be awaiting peer response */
  67         LASSERT(tx->tx_pool);
  68
  69         kiblnd_unmap_tx(ni, tx);
  70
  71         /* tx may have up to 2 lnet msgs to finalise */
  72         lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
  73         lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
  74         rc = tx->tx_status;
  75
  76         if (tx->tx_conn) {
  77                 LASSERT(ni == tx->tx_conn->ibc_peer->ibp_ni);
  78
  79                 kiblnd_conn_decref(tx->tx_conn);
  80                 tx->tx_conn = NULL;
  81         }
  82
  83         tx->tx_nwrq = 0;
  84         tx->tx_status = 0;
  85
  86         kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
  87
  88         /* delay finalize until my descs have been freed */
  89         for (i = 0; i < 2; i++) {
  90                 if (!lntmsg[i])
  91                         continue;
  92
  93                 lnet_finalize(ni, lntmsg[i], rc);
  94         }
  95 }
  96
  97 void
  98 kiblnd_txlist_done(lnet_ni_t *ni, struct list_head *txlist, int status)
  99 {
 100         kib_tx_t *tx;
 101
 102         while (!list_empty(txlist)) {
 103                 tx = list_entry(txlist->next, kib_tx_t, tx_list);
 104
 105                 list_del(&tx->tx_list);
 106                 /* complete now */
 107                 tx->tx_waiting = 0;
 108                 tx->tx_status = status;
 109                 kiblnd_tx_done(ni, tx);
 110         }
 111 }
 112
 113 static kib_tx_t *
 114 kiblnd_get_idle_tx(lnet_ni_t *ni, lnet_nid_t target)
 115 {
 116         kib_net_t *net = (kib_net_t *)ni->ni_data;
 117         struct list_head *node;
 118         kib_tx_t *tx;
 119         kib_tx_poolset_t *tps;
 120
 121         tps = net->ibn_tx_ps[lnet_cpt_of_nid(target)];
 122         node = kiblnd_pool_alloc_node(&tps->tps_poolset);
 123         if (!node)
 124                 return NULL;
 125         tx = list_entry(node, kib_tx_t, tx_list);
 126
 127         LASSERT(!tx->tx_nwrq);
 128         LASSERT(!tx->tx_queued);
 129         LASSERT(!tx->tx_sending);
 130         LASSERT(!tx->tx_waiting);
 131         LASSERT(!tx->tx_status);
 132         LASSERT(!tx->tx_conn);
 133         LASSERT(!tx->tx_lntmsg[0]);
 134         LASSERT(!tx->tx_lntmsg[1]);
 135         LASSERT(!tx->tx_nfrags);
 136
 137         return tx;
 138 }
 139
 140 static void
 141 kiblnd_drop_rx(kib_rx_t *rx)
 142 {
 143         kib_conn_t *conn = rx->rx_conn;
 144         struct kib_sched_info *sched = conn->ibc_sched;
 145         unsigned long flags;
 146
 147         spin_lock_irqsave(&sched->ibs_lock, flags);
 148         LASSERT(conn->ibc_nrx > 0);
 149         conn->ibc_nrx--;
 150         spin_unlock_irqrestore(&sched->ibs_lock, flags);
 151
 152         kiblnd_conn_decref(conn);
 153 }
 154
 155 int
 156 kiblnd_post_rx(kib_rx_t *rx, int credit)
 157 {
 158         kib_conn_t *conn = rx->rx_conn;
 159         kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
 160         struct ib_recv_wr *bad_wrq = NULL;
 161         struct ib_mr *mr = conn->ibc_hdev->ibh_mrs;
 162         int rc;
 163
 164         LASSERT(net);
 165         LASSERT(!in_interrupt());
 166         LASSERT(credit == IBLND_POSTRX_NO_CREDIT ||
 167                 credit == IBLND_POSTRX_PEER_CREDIT ||
 168                 credit == IBLND_POSTRX_RSRVD_CREDIT);
 169         LASSERT(mr);
 170
 171         rx->rx_sge.lkey   = mr->lkey;
 172         rx->rx_sge.addr   = rx->rx_msgaddr;
 173         rx->rx_sge.length = IBLND_MSG_SIZE;
 174
 175         rx->rx_wrq.next    = NULL;
 176         rx->rx_wrq.sg_list = &rx->rx_sge;
 177         rx->rx_wrq.num_sge = 1;
 178         rx->rx_wrq.wr_id   = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
 179
 180         LASSERT(conn->ibc_state >= IBLND_CONN_INIT);
 181         LASSERT(rx->rx_nob >= 0);             /* not posted */
 182
 183         if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
 184                 kiblnd_drop_rx(rx);          /* No more posts for this rx */
 185                 return 0;
 186         }
 187
 188         rx->rx_nob = -1;                        /* flag posted */
 189
 190         /* NB: need an extra reference after ib_post_recv because we don't
 191          * own this rx (and rx::rx_conn) anymore, LU-5678.
 192          */
 193         kiblnd_conn_addref(conn);
 194         rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
 195         if (unlikely(rc)) {
 196                 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
 197                        libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
 198                 rx->rx_nob = 0;
 199         }
 200
 201         if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
 202                 goto out;
 203
 204         if (unlikely(rc)) {
 205                 kiblnd_close_conn(conn, rc);
 206                 kiblnd_drop_rx(rx);          /* No more posts for this rx */
 207                 goto out;
 208         }
 209
 210         if (credit == IBLND_POSTRX_NO_CREDIT)
 211                 goto out;
 212
 213         spin_lock(&conn->ibc_lock);
 214         if (credit == IBLND_POSTRX_PEER_CREDIT)
 215                 conn->ibc_outstanding_credits++;
 216         else
 217                 conn->ibc_reserved_credits++;
 218         spin_unlock(&conn->ibc_lock);
 219
 220         kiblnd_check_sends(conn);
 221 out:
 222         kiblnd_conn_decref(conn);
 223         return rc;
 224 }
 225
 226 static kib_tx_t *
 227 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
 228 {
 229         struct list_head *tmp;
 230
 231         list_for_each(tmp, &conn->ibc_active_txs) {
 232                 kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
 233
 234                 LASSERT(!tx->tx_queued);
 235                 LASSERT(tx->tx_sending || tx->tx_waiting);
 236
 237                 if (tx->tx_cookie != cookie)
 238                         continue;
 239
 240                 if (tx->tx_waiting &&
 241                     tx->tx_msg->ibm_type == txtype)
 242                         return tx;
 243
 244                 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
 245                       tx->tx_waiting ? "" : "NOT ",
 246                       tx->tx_msg->ibm_type, txtype);
 247         }
 248         return NULL;
 249 }
 250
 251 static void
 252 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
 253 {
 254         kib_tx_t *tx;
 255         lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
 256         int idle;
 257
 258         spin_lock(&conn->ibc_lock);
 259
 260         tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
 261         if (!tx) {
 262                 spin_unlock(&conn->ibc_lock);
 263
 264                 CWARN("Unmatched completion type %x cookie %#llx from %s\n",
 265                       txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 266                 kiblnd_close_conn(conn, -EPROTO);
 267                 return;
 268         }
 269
 270         if (!tx->tx_status) {          /* success so far */
 271                 if (status < 0) /* failed? */
 272                         tx->tx_status = status;
 273                 else if (txtype == IBLND_MSG_GET_REQ)
 274                         lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
 275         }
 276
 277         tx->tx_waiting = 0;
 278
 279         idle = !tx->tx_queued && !tx->tx_sending;
 280         if (idle)
 281                 list_del(&tx->tx_list);
 282
 283         spin_unlock(&conn->ibc_lock);
 284
 285         if (idle)
 286                 kiblnd_tx_done(ni, tx);
 287 }
 288
 289 static void
 290 kiblnd_send_completion(kib_conn_t *conn, int type, int status, __u64 cookie)
 291 {
 292         lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
 293         kib_tx_t *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
 294
 295         if (!tx) {
 296                 CERROR("Can't get tx for completion %x for %s\n",
 297                        type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 298                 return;
 299         }
 300
 301         tx->tx_msg->ibm_u.completion.ibcm_status = status;
 302         tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
 303         kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
 304
 305         kiblnd_queue_tx(tx, conn);
 306 }
 307
 308 static void
 309 kiblnd_handle_rx(kib_rx_t *rx)
 310 {
 311         kib_msg_t *msg = rx->rx_msg;
 312         kib_conn_t *conn = rx->rx_conn;
 313         lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
 314         int credits = msg->ibm_credits;
 315         kib_tx_t *tx;
 316         int rc = 0;
 317         int rc2;
 318         int post_credit;
 319
 320         LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
 321
 322         CDEBUG(D_NET, "Received %x[%d] from %s\n",
 323                msg->ibm_type, credits,
 324                libcfs_nid2str(conn->ibc_peer->ibp_nid));
 325
 326         if (credits) {
 327                 /* Have I received credits that will let me send? */
 328                 spin_lock(&conn->ibc_lock);
 329
 330                 if (conn->ibc_credits + credits >
 331                     conn->ibc_queue_depth) {
 332                         rc2 = conn->ibc_credits;
 333                         spin_unlock(&conn->ibc_lock);
 334
 335                         CERROR("Bad credits from %s: %d + %d > %d\n",
 336                                libcfs_nid2str(conn->ibc_peer->ibp_nid),
 337                                rc2, credits, conn->ibc_queue_depth);
 338
 339                         kiblnd_close_conn(conn, -EPROTO);
 340                         kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
 341                         return;
 342                 }
 343
 344                 conn->ibc_credits += credits;
 345
 346                 /* This ensures the credit taken by NOOP can be returned */
 347                 if (msg->ibm_type == IBLND_MSG_NOOP &&
 348                     !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
 349                         conn->ibc_outstanding_credits++;
 350
 351                 spin_unlock(&conn->ibc_lock);
 352                 kiblnd_check_sends(conn);
 353         }
 354
 355         switch (msg->ibm_type) {
 356         default:
 357                 CERROR("Bad IBLND message type %x from %s\n",
 358                        msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 359                 post_credit = IBLND_POSTRX_NO_CREDIT;
 360                 rc = -EPROTO;
 361                 break;
 362
 363         case IBLND_MSG_NOOP:
 364                 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
 365                         post_credit = IBLND_POSTRX_NO_CREDIT;
 366                         break;
 367                 }
 368
 369                 if (credits) /* credit already posted */
 370                         post_credit = IBLND_POSTRX_NO_CREDIT;
 371                 else          /* a keepalive NOOP */
 372                         post_credit = IBLND_POSTRX_PEER_CREDIT;
 373                 break;
 374
 375         case IBLND_MSG_IMMEDIATE:
 376                 post_credit = IBLND_POSTRX_DONT_POST;
 377                 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
 378                                 msg->ibm_srcnid, rx, 0);
 379                 if (rc < 0)                  /* repost on error */
 380                         post_credit = IBLND_POSTRX_PEER_CREDIT;
 381                 break;
 382
 383         case IBLND_MSG_PUT_REQ:
 384                 post_credit = IBLND_POSTRX_DONT_POST;
 385                 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
 386                                 msg->ibm_srcnid, rx, 1);
 387                 if (rc < 0)                  /* repost on error */
 388                         post_credit = IBLND_POSTRX_PEER_CREDIT;
 389                 break;
 390
 391         case IBLND_MSG_PUT_NAK:
 392                 CWARN("PUT_NACK from %s\n",
 393                       libcfs_nid2str(conn->ibc_peer->ibp_nid));
 394                 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
 395                 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
 396                                          msg->ibm_u.completion.ibcm_status,
 397                                          msg->ibm_u.completion.ibcm_cookie);
 398                 break;
 399
 400         case IBLND_MSG_PUT_ACK:
 401                 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
 402
 403                 spin_lock(&conn->ibc_lock);
 404                 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
 405                                                    msg->ibm_u.putack.ibpam_src_cookie);
 406                 if (tx)
 407                         list_del(&tx->tx_list);
 408                 spin_unlock(&conn->ibc_lock);
 409
 410                 if (!tx) {
 411                         CERROR("Unmatched PUT_ACK from %s\n",
 412                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
 413                         rc = -EPROTO;
 414                         break;
 415                 }
 416
 417                 LASSERT(tx->tx_waiting);
 418                 /*
 419                  * CAVEAT EMPTOR: I could be racing with tx_complete, but...
 420                  * (a) I can overwrite tx_msg since my peer has received it!
 421                  * (b) tx_waiting set tells tx_complete() it's not done.
 422                  */
 423                 tx->tx_nwrq = 0;                /* overwrite PUT_REQ */
 424
 425                 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
 426                                        kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
 427                                        &msg->ibm_u.putack.ibpam_rd,
 428                                        msg->ibm_u.putack.ibpam_dst_cookie);
 429                 if (rc2 < 0)
 430                         CERROR("Can't setup rdma for PUT to %s: %d\n",
 431                                libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
 432
 433                 spin_lock(&conn->ibc_lock);
 434                 tx->tx_waiting = 0;     /* clear waiting and queue atomically */
 435                 kiblnd_queue_tx_locked(tx, conn);
 436                 spin_unlock(&conn->ibc_lock);
 437                 break;
 438
 439         case IBLND_MSG_PUT_DONE:
 440                 post_credit = IBLND_POSTRX_PEER_CREDIT;
 441                 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
 442                                          msg->ibm_u.completion.ibcm_status,
 443                                          msg->ibm_u.completion.ibcm_cookie);
 444                 break;
 445
 446         case IBLND_MSG_GET_REQ:
 447                 post_credit = IBLND_POSTRX_DONT_POST;
 448                 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
 449                                 msg->ibm_srcnid, rx, 1);
 450                 if (rc < 0)                  /* repost on error */
 451                         post_credit = IBLND_POSTRX_PEER_CREDIT;
 452                 break;
 453
 454         case IBLND_MSG_GET_DONE:
 455                 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
 456                 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
 457                                          msg->ibm_u.completion.ibcm_status,
 458                                          msg->ibm_u.completion.ibcm_cookie);
 459                 break;
 460         }
 461
 462         if (rc < 0)                          /* protocol error */
 463                 kiblnd_close_conn(conn, rc);
 464
 465         if (post_credit != IBLND_POSTRX_DONT_POST)
 466                 kiblnd_post_rx(rx, post_credit);
 467 }
 468
 469 static void
 470 kiblnd_rx_complete(kib_rx_t *rx, int status, int nob)
 471 {
 472         kib_msg_t *msg = rx->rx_msg;
 473         kib_conn_t *conn = rx->rx_conn;
 474         lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
 475         kib_net_t *net = ni->ni_data;
 476         int rc;
 477         int err = -EIO;
 478
 479         LASSERT(net);
 480         LASSERT(rx->rx_nob < 0);               /* was posted */
 481         rx->rx_nob = 0;                  /* isn't now */
 482
 483         if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
 484                 goto ignore;
 485
 486         if (status != IB_WC_SUCCESS) {
 487                 CNETERR("Rx from %s failed: %d\n",
 488                         libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
 489                 goto failed;
 490         }
 491
 492         LASSERT(nob >= 0);
 493         rx->rx_nob = nob;
 494
 495         rc = kiblnd_unpack_msg(msg, rx->rx_nob);
 496         if (rc) {
 497                 CERROR("Error %d unpacking rx from %s\n",
 498                        rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 499                 goto failed;
 500         }
 501
 502         if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
 503             msg->ibm_dstnid != ni->ni_nid ||
 504             msg->ibm_srcstamp != conn->ibc_incarnation ||
 505             msg->ibm_dststamp != net->ibn_incarnation) {
 506                 CERROR("Stale rx from %s\n",
 507                        libcfs_nid2str(conn->ibc_peer->ibp_nid));
 508                 err = -ESTALE;
 509                 goto failed;
 510         }
 511
 512         /* set time last known alive */
 513         kiblnd_peer_alive(conn->ibc_peer);
 514
 515         /* racing with connection establishment/teardown! */
 516
 517         if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
 518                 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
 519                 unsigned long flags;
 520
 521                 write_lock_irqsave(g_lock, flags);
 522                 /* must check holding global lock to eliminate race */
 523                 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
 524                         list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
 525                         write_unlock_irqrestore(g_lock, flags);
 526                         return;
 527                 }
 528                 write_unlock_irqrestore(g_lock, flags);
 529         }
 530         kiblnd_handle_rx(rx);
 531         return;
 532
 533  failed:
 534         CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
 535         kiblnd_close_conn(conn, err);
 536  ignore:
 537         kiblnd_drop_rx(rx);                  /* Don't re-post rx. */
 538 }
 539
 540 static struct page *
 541 kiblnd_kvaddr_to_page(unsigned long vaddr)
 542 {
 543         struct page *page;
 544
 545         if (is_vmalloc_addr((void *)vaddr)) {
 546                 page = vmalloc_to_page((void *)vaddr);
 547                 LASSERT(page);
 548                 return page;
 549         }
 550 #ifdef CONFIG_HIGHMEM
 551         if (vaddr >= PKMAP_BASE &&
 552             vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
 553                 /* No highmem pages only used for bulk (kiov) I/O */
 554                 CERROR("find page for address in highmem\n");
 555                 LBUG();
 556         }
 557 #endif
 558         page = virt_to_page(vaddr);
 559         LASSERT(page);
 560         return page;
 561 }
 562
 563 static int
 564 kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, __u32 nob)
 565 {
 566         kib_hca_dev_t *hdev;
 567         kib_fmr_poolset_t *fps;
 568         int cpt;
 569         int rc;
 570
 571         LASSERT(tx->tx_pool);
 572         LASSERT(tx->tx_pool->tpo_pool.po_owner);
 573
 574         hdev = tx->tx_pool->tpo_hdev;
 575         cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
 576
 577         fps = net->ibn_fmr_ps[cpt];
 578         rc = kiblnd_fmr_pool_map(fps, tx, rd, nob, 0, &tx->fmr);
 579         if (rc) {
 580                 CERROR("Can't map %u bytes: %d\n", nob, rc);
 581                 return rc;
 582         }
 583
 584         /*
 585          * If rd is not tx_rd, it's going to get sent to a peer, who will need
 586          * the rkey
 587          */
 588         rd->rd_key = tx->fmr.fmr_key;
 589         rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
 590         rd->rd_frags[0].rf_nob = nob;
 591         rd->rd_nfrags = 1;
 592
 593         return 0;
 594 }
 595
 596 static void kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
 597 {
 598         kib_net_t *net = ni->ni_data;
 599
 600         LASSERT(net);
 601
 602         if (net->ibn_fmr_ps)
 603                 kiblnd_fmr_pool_unmap(&tx->fmr, tx->tx_status);
 604
 605         if (tx->tx_nfrags) {
 606                 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
 607                                     tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
 608                 tx->tx_nfrags = 0;
 609         }
 610 }
 611
 612 static int kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
 613                          int nfrags)
 614 {
 615         kib_net_t *net = ni->ni_data;
 616         kib_hca_dev_t *hdev = net->ibn_dev->ibd_hdev;
 617         struct ib_mr *mr    = NULL;
 618         __u32 nob;
 619         int i;
 620
 621         /*
 622          * If rd is not tx_rd, it's going to get sent to a peer and I'm the
 623          * RDMA sink
 624          */
 625         tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 626         tx->tx_nfrags = nfrags;
 627
 628         rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
 629                                           tx->tx_nfrags, tx->tx_dmadir);
 630
 631         for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
 632                 rd->rd_frags[i].rf_nob  = kiblnd_sg_dma_len(
 633                         hdev->ibh_ibdev, &tx->tx_frags[i]);
 634                 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
 635                         hdev->ibh_ibdev, &tx->tx_frags[i]);
 636                 nob += rd->rd_frags[i].rf_nob;
 637         }
 638
 639         mr = kiblnd_find_rd_dma_mr(ni, rd, tx->tx_conn ?
 640                                    tx->tx_conn->ibc_max_frags : -1);
 641         if (mr) {
 642                 /* found pre-mapping MR */
 643                 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
 644                 return 0;
 645         }
 646
 647         if (net->ibn_fmr_ps)
 648                 return kiblnd_fmr_map_tx(net, tx, rd, nob);
 649
 650         return -EINVAL;
 651 }
 652
 653 static int
 654 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
 655                     unsigned int niov, struct kvec *iov, int offset, int nob)
 656 {
 657         kib_net_t *net = ni->ni_data;
 658         struct page *page;
 659         struct scatterlist *sg;
 660         unsigned long vaddr;
 661         int fragnob;
 662         int page_offset;
 663
 664         LASSERT(nob > 0);
 665         LASSERT(niov > 0);
 666         LASSERT(net);
 667
 668         while (offset >= iov->iov_len) {
 669                 offset -= iov->iov_len;
 670                 niov--;
 671                 iov++;
 672                 LASSERT(niov > 0);
 673         }
 674
 675         sg = tx->tx_frags;
 676         do {
 677                 LASSERT(niov > 0);
 678
 679                 vaddr = ((unsigned long)iov->iov_base) + offset;
 680                 page_offset = vaddr & (PAGE_SIZE - 1);
 681                 page = kiblnd_kvaddr_to_page(vaddr);
 682                 if (!page) {
 683                         CERROR("Can't find page\n");
 684                         return -EFAULT;
 685                 }
 686
 687                 fragnob = min((int)(iov->iov_len - offset), nob);
 688                 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
 689
 690                 sg_set_page(sg, page, fragnob, page_offset);
 691                 sg = sg_next(sg);
 692
 693                 if (offset + fragnob < iov->iov_len) {
 694                         offset += fragnob;
 695                 } else {
 696                         offset = 0;
 697                         iov++;
 698                         niov--;
 699                 }
 700                 nob -= fragnob;
 701         } while (nob > 0);
 702
 703         return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
 704 }
 705
 706 static int
 707 kiblnd_setup_rd_kiov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
 708                      int nkiov, lnet_kiov_t *kiov, int offset, int nob)
 709 {
 710         kib_net_t *net = ni->ni_data;
 711         struct scatterlist *sg;
 712         int fragnob;
 713
 714         CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
 715
 716         LASSERT(nob > 0);
 717         LASSERT(nkiov > 0);
 718         LASSERT(net);
 719
 720         while (offset >= kiov->kiov_len) {
 721                 offset -= kiov->kiov_len;
 722                 nkiov--;
 723                 kiov++;
 724                 LASSERT(nkiov > 0);
 725         }
 726
 727         sg = tx->tx_frags;
 728         do {
 729                 LASSERT(nkiov > 0);
 730
 731                 fragnob = min((int)(kiov->kiov_len - offset), nob);
 732
 733                 sg_set_page(sg, kiov->kiov_page, fragnob,
 734                             kiov->kiov_offset + offset);
 735                 sg = sg_next(sg);
 736
 737                 offset = 0;
 738                 kiov++;
 739                 nkiov--;
 740                 nob -= fragnob;
 741         } while (nob > 0);
 742
 743         return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
 744 }
 745
 746 static int
 747 kiblnd_post_tx_locked(kib_conn_t *conn, kib_tx_t *tx, int credit)
 748         __must_hold(&conn->ibc_lock)
 749 {
 750         kib_msg_t *msg = tx->tx_msg;
 751         kib_peer_t *peer = conn->ibc_peer;
 752         struct lnet_ni *ni = peer->ibp_ni;
 753         int ver = conn->ibc_version;
 754         int rc;
 755         int done;
 756
 757         LASSERT(tx->tx_queued);
 758         /* We rely on this for QP sizing */
 759         LASSERT(tx->tx_nwrq > 0);
 760         LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
 761
 762         LASSERT(!credit || credit == 1);
 763         LASSERT(conn->ibc_outstanding_credits >= 0);
 764         LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
 765         LASSERT(conn->ibc_credits >= 0);
 766         LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
 767
 768         if (conn->ibc_nsends_posted == kiblnd_concurrent_sends(ver, ni)) {
 769                 /* tx completions outstanding... */
 770                 CDEBUG(D_NET, "%s: posted enough\n",
 771                        libcfs_nid2str(peer->ibp_nid));
 772                 return -EAGAIN;
 773         }
 774
 775         if (credit && !conn->ibc_credits) {   /* no credits */
 776                 CDEBUG(D_NET, "%s: no credits\n",
 777                        libcfs_nid2str(peer->ibp_nid));
 778                 return -EAGAIN;
 779         }
 780
 781         if (credit && !IBLND_OOB_CAPABLE(ver) &&
 782             conn->ibc_credits == 1 &&   /* last credit reserved */
 783             msg->ibm_type != IBLND_MSG_NOOP) {      /* for NOOP */
 784                 CDEBUG(D_NET, "%s: not using last credit\n",
 785                        libcfs_nid2str(peer->ibp_nid));
 786                 return -EAGAIN;
 787         }
 788
 789         /* NB don't drop ibc_lock before bumping tx_sending */
 790         list_del(&tx->tx_list);
 791         tx->tx_queued = 0;
 792
 793         if (msg->ibm_type == IBLND_MSG_NOOP &&
 794             (!kiblnd_need_noop(conn) ||     /* redundant NOOP */
 795              (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
 796               conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
 797                 /*
 798                  * OK to drop when posted enough NOOPs, since
 799                  * kiblnd_check_sends will queue NOOP again when
 800                  * posted NOOPs complete
 801                  */
 802                 spin_unlock(&conn->ibc_lock);
 803                 kiblnd_tx_done(peer->ibp_ni, tx);
 804                 spin_lock(&conn->ibc_lock);
 805                 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
 806                        libcfs_nid2str(peer->ibp_nid),
 807                        conn->ibc_noops_posted);
 808                 return 0;
 809         }
 810
 811         kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
 812                         peer->ibp_nid, conn->ibc_incarnation);
 813
 814         conn->ibc_credits -= credit;
 815         conn->ibc_outstanding_credits = 0;
 816         conn->ibc_nsends_posted++;
 817         if (msg->ibm_type == IBLND_MSG_NOOP)
 818                 conn->ibc_noops_posted++;
 819
 820         /*
 821          * CAVEAT EMPTOR!  This tx could be the PUT_DONE of an RDMA
 822          * PUT.  If so, it was first queued here as a PUT_REQ, sent and
 823          * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
 824          * and then re-queued here.  It's (just) possible that
 825          * tx_sending is non-zero if we've not done the tx_complete()
 826          * from the first send; hence the ++ rather than = below.
 827          */
 828         tx->tx_sending++;
 829         list_add(&tx->tx_list, &conn->ibc_active_txs);
 830
 831         /* I'm still holding ibc_lock! */
 832         if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
 833                 rc = -ECONNABORTED;
 834         } else if (tx->tx_pool->tpo_pool.po_failed ||
 835                  conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
 836                 /* close_conn will launch failover */
 837                 rc = -ENETDOWN;
 838         } else {
 839                 struct kib_fast_reg_descriptor *frd = tx->fmr.fmr_frd;
 840                 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
 841                 struct ib_send_wr *wrq = &tx->tx_wrq[0].wr;
 842
 843                 if (frd) {
 844                         if (!frd->frd_valid) {
 845                                 wrq = &frd->frd_inv_wr;
 846                                 wrq->next = &frd->frd_fastreg_wr.wr;
 847                         } else {
 848                                 wrq = &frd->frd_fastreg_wr.wr;
 849                         }
 850                         frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
 851                 }
 852
 853                 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
 854                          "bad wr_id %llx, opc %d, flags %d, peer: %s\n",
 855                          bad->wr_id, bad->opcode, bad->send_flags,
 856                          libcfs_nid2str(conn->ibc_peer->ibp_nid));
 857                 bad = NULL;
 858                 rc = ib_post_send(conn->ibc_cmid->qp, wrq, &bad);
 859         }
 860
 861         conn->ibc_last_send = jiffies;
 862
 863         if (!rc)
 864                 return 0;
 865
 866         /*
 867          * NB credits are transferred in the actual
 868          * message, which can only be the last work item
 869          */
 870         conn->ibc_credits += credit;
 871         conn->ibc_outstanding_credits += msg->ibm_credits;
 872         conn->ibc_nsends_posted--;
 873         if (msg->ibm_type == IBLND_MSG_NOOP)
 874                 conn->ibc_noops_posted--;
 875
 876         tx->tx_status = rc;
 877         tx->tx_waiting = 0;
 878         tx->tx_sending--;
 879
 880         done = !tx->tx_sending;
 881         if (done)
 882                 list_del(&tx->tx_list);
 883
 884         spin_unlock(&conn->ibc_lock);
 885
 886         if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
 887                 CERROR("Error %d posting transmit to %s\n",
 888                        rc, libcfs_nid2str(peer->ibp_nid));
 889         else
 890                 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
 891                        rc, libcfs_nid2str(peer->ibp_nid));
 892
 893         kiblnd_close_conn(conn, rc);
 894
 895         if (done)
 896                 kiblnd_tx_done(peer->ibp_ni, tx);
 897
 898         spin_lock(&conn->ibc_lock);
 899
 900         return -EIO;
 901 }
 902
 903 static void
 904 kiblnd_check_sends(kib_conn_t *conn)
 905 {
 906         int ver = conn->ibc_version;
 907         lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
 908         kib_tx_t *tx;
 909
 910         /* Don't send anything until after the connection is established */
 911         if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
 912                 CDEBUG(D_NET, "%s too soon\n",
 913                        libcfs_nid2str(conn->ibc_peer->ibp_nid));
 914                 return;
 915         }
 916
 917         spin_lock(&conn->ibc_lock);
 918
 919         LASSERT(conn->ibc_nsends_posted <= kiblnd_concurrent_sends(ver, ni));
 920         LASSERT(!IBLND_OOB_CAPABLE(ver) ||
 921                 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
 922         LASSERT(conn->ibc_reserved_credits >= 0);
 923
 924         while (conn->ibc_reserved_credits > 0 &&
 925                !list_empty(&conn->ibc_tx_queue_rsrvd)) {
 926                 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
 927                                 kib_tx_t, tx_list);
 928                 list_del(&tx->tx_list);
 929                 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
 930                 conn->ibc_reserved_credits--;
 931         }
 932
 933         if (kiblnd_need_noop(conn)) {
 934                 spin_unlock(&conn->ibc_lock);
 935
 936                 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
 937                 if (tx)
 938                         kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
 939
 940                 spin_lock(&conn->ibc_lock);
 941                 if (tx)
 942                         kiblnd_queue_tx_locked(tx, conn);
 943         }
 944
 945         for (;;) {
 946                 int credit;
 947
 948                 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
 949                         credit = 0;
 950                         tx = list_entry(conn->ibc_tx_queue_nocred.next,
 951                                         kib_tx_t, tx_list);
 952                 } else if (!list_empty(&conn->ibc_tx_noops)) {
 953                         LASSERT(!IBLND_OOB_CAPABLE(ver));
 954                         credit = 1;
 955                         tx = list_entry(conn->ibc_tx_noops.next,
 956                                         kib_tx_t, tx_list);
 957                 } else if (!list_empty(&conn->ibc_tx_queue)) {
 958                         credit = 1;
 959                         tx = list_entry(conn->ibc_tx_queue.next,
 960                                         kib_tx_t, tx_list);
 961                 } else {
 962                         break;
 963                 }
 964
 965                 if (kiblnd_post_tx_locked(conn, tx, credit))
 966                         break;
 967         }
 968
 969         spin_unlock(&conn->ibc_lock);
 970 }
 971
 972 static void
 973 kiblnd_tx_complete(kib_tx_t *tx, int status)
 974 {
 975         int failed = (status != IB_WC_SUCCESS);
 976         kib_conn_t *conn = tx->tx_conn;
 977         int idle;
 978
 979         LASSERT(tx->tx_sending > 0);
 980
 981         if (failed) {
 982                 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
 983                         CNETERR("Tx -> %s cookie %#llx sending %d waiting %d: failed %d\n",
 984                                 libcfs_nid2str(conn->ibc_peer->ibp_nid),
 985                                 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
 986                                 status);
 987
 988                 kiblnd_close_conn(conn, -EIO);
 989         } else {
 990                 kiblnd_peer_alive(conn->ibc_peer);
 991         }
 992
 993         spin_lock(&conn->ibc_lock);
 994
 995         /*
 996          * I could be racing with rdma completion.  Whoever makes 'tx' idle
 997          * gets to free it, which also drops its ref on 'conn'.
 998          */
 999         tx->tx_sending--;
1000         conn->ibc_nsends_posted--;
1001         if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1002                 conn->ibc_noops_posted--;
1003
1004         if (failed) {
1005                 tx->tx_waiting = 0;          /* don't wait for peer */
1006                 tx->tx_status = -EIO;
1007         }
1008
1009         idle = !tx->tx_sending &&        /* This is the final callback */
1010                !tx->tx_waiting &&              /* Not waiting for peer */
1011                !tx->tx_queued;            /* Not re-queued (PUT_DONE) */
1012         if (idle)
1013                 list_del(&tx->tx_list);
1014
1015         kiblnd_conn_addref(conn);              /* 1 ref for me.... */
1016
1017         spin_unlock(&conn->ibc_lock);
1018
1019         if (idle)
1020                 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1021
1022         kiblnd_check_sends(conn);
1023
1024         kiblnd_conn_decref(conn);              /* ...until here */
1025 }
1026
1027 static void
1028 kiblnd_init_tx_msg(lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1029 {
1030         kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1031         struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1032         struct ib_rdma_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1033         int nob = offsetof(kib_msg_t, ibm_u) + body_nob;
1034         struct ib_mr *mr = hdev->ibh_mrs;
1035
1036         LASSERT(tx->tx_nwrq >= 0);
1037         LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1038         LASSERT(nob <= IBLND_MSG_SIZE);
1039         LASSERT(mr);
1040
1041         kiblnd_init_msg(tx->tx_msg, type, body_nob);
1042
1043         sge->lkey   = mr->lkey;
1044         sge->addr   = tx->tx_msgaddr;
1045         sge->length = nob;
1046
1047         memset(wrq, 0, sizeof(*wrq));
1048
1049         wrq->wr.next       = NULL;
1050         wrq->wr.wr_id      = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1051         wrq->wr.sg_list    = sge;
1052         wrq->wr.num_sge    = 1;
1053         wrq->wr.opcode     = IB_WR_SEND;
1054         wrq->wr.send_flags = IB_SEND_SIGNALED;
1055
1056         tx->tx_nwrq++;
1057 }
1058
1059 static int
1060 kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
1061                  int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1062 {
1063         kib_msg_t *ibmsg = tx->tx_msg;
1064         kib_rdma_desc_t *srcrd = tx->tx_rd;
1065         struct ib_sge *sge = &tx->tx_sge[0];
1066         struct ib_rdma_wr *wrq, *next;
1067         int rc  = resid;
1068         int srcidx = 0;
1069         int dstidx = 0;
1070         int wrknob;
1071
1072         LASSERT(!in_interrupt());
1073         LASSERT(!tx->tx_nwrq);
1074         LASSERT(type == IBLND_MSG_GET_DONE ||
1075                 type == IBLND_MSG_PUT_DONE);
1076
1077         while (resid > 0) {
1078                 if (srcidx >= srcrd->rd_nfrags) {
1079                         CERROR("Src buffer exhausted: %d frags\n", srcidx);
1080                         rc = -EPROTO;
1081                         break;
1082                 }
1083
1084                 if (dstidx == dstrd->rd_nfrags) {
1085                         CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1086                         rc = -EPROTO;
1087                         break;
1088                 }
1089
1090                 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1091                         CERROR("RDMA has too many fragments for peer %s (%d), src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1092                                libcfs_nid2str(conn->ibc_peer->ibp_nid),
1093                                conn->ibc_max_frags,
1094                                srcidx, srcrd->rd_nfrags,
1095                                dstidx, dstrd->rd_nfrags);
1096                         rc = -EMSGSIZE;
1097                         break;
1098                 }
1099
1100                 wrknob = min(min(kiblnd_rd_frag_size(srcrd, srcidx),
1101                                  kiblnd_rd_frag_size(dstrd, dstidx)),
1102                              (__u32) resid);
1103
1104                 sge = &tx->tx_sge[tx->tx_nwrq];
1105                 sge->addr   = kiblnd_rd_frag_addr(srcrd, srcidx);
1106                 sge->lkey   = kiblnd_rd_frag_key(srcrd, srcidx);
1107                 sge->length = wrknob;
1108
1109                 wrq = &tx->tx_wrq[tx->tx_nwrq];
1110                 next = wrq + 1;
1111
1112                 wrq->wr.next       = &next->wr;
1113                 wrq->wr.wr_id      = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1114                 wrq->wr.sg_list    = sge;
1115                 wrq->wr.num_sge    = 1;
1116                 wrq->wr.opcode     = IB_WR_RDMA_WRITE;
1117                 wrq->wr.send_flags = 0;
1118
1119                 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1120                 wrq->rkey        = kiblnd_rd_frag_key(dstrd, dstidx);
1121
1122                 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1123                 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1124
1125                 resid -= wrknob;
1126
1127                 tx->tx_nwrq++;
1128                 wrq++;
1129                 sge++;
1130         }
1131
1132         if (rc < 0)                          /* no RDMA if completing with failure */
1133                 tx->tx_nwrq = 0;
1134
1135         ibmsg->ibm_u.completion.ibcm_status = rc;
1136         ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1137         kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1138                            type, sizeof(kib_completion_msg_t));
1139
1140         return rc;
1141 }
1142
1143 static void
1144 kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn)
1145 {
1146         struct list_head *q;
1147
1148         LASSERT(tx->tx_nwrq > 0);             /* work items set up */
1149         LASSERT(!tx->tx_queued);               /* not queued for sending already */
1150         LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1151
1152         tx->tx_queued = 1;
1153         tx->tx_deadline = jiffies +
1154                           msecs_to_jiffies(*kiblnd_tunables.kib_timeout *
1155                                            MSEC_PER_SEC);
1156
1157         if (!tx->tx_conn) {
1158                 kiblnd_conn_addref(conn);
1159                 tx->tx_conn = conn;
1160                 LASSERT(tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1161         } else {
1162                 /* PUT_DONE first attached to conn as a PUT_REQ */
1163                 LASSERT(tx->tx_conn == conn);
1164                 LASSERT(tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1165         }
1166
1167         switch (tx->tx_msg->ibm_type) {
1168         default:
1169                 LBUG();
1170
1171         case IBLND_MSG_PUT_REQ:
1172         case IBLND_MSG_GET_REQ:
1173                 q = &conn->ibc_tx_queue_rsrvd;
1174                 break;
1175
1176         case IBLND_MSG_PUT_NAK:
1177         case IBLND_MSG_PUT_ACK:
1178         case IBLND_MSG_PUT_DONE:
1179         case IBLND_MSG_GET_DONE:
1180                 q = &conn->ibc_tx_queue_nocred;
1181                 break;
1182
1183         case IBLND_MSG_NOOP:
1184                 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1185                         q = &conn->ibc_tx_queue_nocred;
1186                 else
1187                         q = &conn->ibc_tx_noops;
1188                 break;
1189
1190         case IBLND_MSG_IMMEDIATE:
1191                 q = &conn->ibc_tx_queue;
1192                 break;
1193         }
1194
1195         list_add_tail(&tx->tx_list, q);
1196 }
1197
1198 static void
1199 kiblnd_queue_tx(kib_tx_t *tx, kib_conn_t *conn)
1200 {
1201         spin_lock(&conn->ibc_lock);
1202         kiblnd_queue_tx_locked(tx, conn);
1203         spin_unlock(&conn->ibc_lock);
1204
1205         kiblnd_check_sends(conn);
1206 }
1207
1208 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1209                                struct sockaddr_in *srcaddr,
1210                                struct sockaddr_in *dstaddr,
1211                                int timeout_ms)
1212 {
1213         unsigned short port;
1214         int rc;
1215
1216         /* allow the port to be reused */
1217         rc = rdma_set_reuseaddr(cmid, 1);
1218         if (rc) {
1219                 CERROR("Unable to set reuse on cmid: %d\n", rc);
1220                 return rc;
1221         }
1222
1223         /* look for a free privileged port */
1224         for (port = PROT_SOCK - 1; port > 0; port--) {
1225                 srcaddr->sin_port = htons(port);
1226                 rc = rdma_resolve_addr(cmid,
1227                                        (struct sockaddr *)srcaddr,
1228                                        (struct sockaddr *)dstaddr,
1229                                        timeout_ms);
1230                 if (!rc) {
1231                         CDEBUG(D_NET, "bound to port %hu\n", port);
1232                         return 0;
1233                 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1234                         CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1235                                port, rc);
1236                 } else {
1237                         return rc;
1238                 }
1239         }
1240
1241         CERROR("Failed to bind to a free privileged port\n");
1242         return rc;
1243 }
1244
1245 static void
1246 kiblnd_connect_peer(kib_peer_t *peer)
1247 {
1248         struct rdma_cm_id *cmid;
1249         kib_dev_t *dev;
1250         kib_net_t *net = peer->ibp_ni->ni_data;
1251         struct sockaddr_in srcaddr;
1252         struct sockaddr_in dstaddr;
1253         int rc;
1254
1255         LASSERT(net);
1256         LASSERT(peer->ibp_connecting > 0);
1257         LASSERT(!peer->ibp_reconnecting);
1258
1259         cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1260                                      IB_QPT_RC);
1261
1262         if (IS_ERR(cmid)) {
1263                 CERROR("Can't create CMID for %s: %ld\n",
1264                        libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1265                 rc = PTR_ERR(cmid);
1266                 goto failed;
1267         }
1268
1269         dev = net->ibn_dev;
1270         memset(&srcaddr, 0, sizeof(srcaddr));
1271         srcaddr.sin_family = AF_INET;
1272         srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1273
1274         memset(&dstaddr, 0, sizeof(dstaddr));
1275         dstaddr.sin_family = AF_INET;
1276         dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1277         dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1278
1279         kiblnd_peer_addref(peer);              /* cmid's ref */
1280
1281         if (*kiblnd_tunables.kib_use_priv_port) {
1282                 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1283                                          *kiblnd_tunables.kib_timeout * 1000);
1284         } else {
1285                 rc = rdma_resolve_addr(cmid,
1286                                        (struct sockaddr *)&srcaddr,
1287                                        (struct sockaddr *)&dstaddr,
1288                                        *kiblnd_tunables.kib_timeout * 1000);
1289         }
1290         if (rc) {
1291                 /* Can't initiate address resolution:  */
1292                 CERROR("Can't resolve addr for %s: %d\n",
1293                        libcfs_nid2str(peer->ibp_nid), rc);
1294                 goto failed2;
1295         }
1296
1297         LASSERT(cmid->device);
1298         CDEBUG(D_NET, "%s: connection bound to %s:%pI4h:%s\n",
1299                libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
1300                &dev->ibd_ifip, cmid->device->name);
1301
1302         return;
1303
1304  failed2:
1305         kiblnd_peer_connect_failed(peer, 1, rc);
1306         kiblnd_peer_decref(peer);              /* cmid's ref */
1307         rdma_destroy_id(cmid);
1308         return;
1309  failed:
1310         kiblnd_peer_connect_failed(peer, 1, rc);
1311 }
1312
1313 bool
1314 kiblnd_reconnect_peer(kib_peer_t *peer)
1315 {
1316         rwlock_t *glock = &kiblnd_data.kib_global_lock;
1317         char *reason = NULL;
1318         struct list_head txs;
1319         unsigned long flags;
1320
1321         INIT_LIST_HEAD(&txs);
1322
1323         write_lock_irqsave(glock, flags);
1324         if (!peer->ibp_reconnecting) {
1325                 if (peer->ibp_accepting)
1326                         reason = "accepting";
1327                 else if (peer->ibp_connecting)
1328                         reason = "connecting";
1329                 else if (!list_empty(&peer->ibp_conns))
1330                         reason = "connected";
1331                 else /* connected then closed */
1332                         reason = "closed";
1333
1334                 goto no_reconnect;
1335         }
1336
1337         LASSERT(!peer->ibp_accepting && !peer->ibp_connecting &&
1338                 list_empty(&peer->ibp_conns));
1339         peer->ibp_reconnecting = 0;
1340
1341         if (!kiblnd_peer_active(peer)) {
1342                 list_splice_init(&peer->ibp_tx_queue, &txs);
1343                 reason = "unlinked";
1344                 goto no_reconnect;
1345         }
1346
1347         peer->ibp_connecting++;
1348         peer->ibp_reconnected++;
1349         write_unlock_irqrestore(glock, flags);
1350
1351         kiblnd_connect_peer(peer);
1352         return true;
1353
1354 no_reconnect:
1355         write_unlock_irqrestore(glock, flags);
1356
1357         CWARN("Abort reconnection of %s: %s\n",
1358               libcfs_nid2str(peer->ibp_nid), reason);
1359         kiblnd_txlist_done(peer->ibp_ni, &txs, -ECONNABORTED);
1360         return false;
1361 }
1362
1363 void
1364 kiblnd_launch_tx(lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1365 {
1366         kib_peer_t *peer;
1367         kib_peer_t *peer2;
1368         kib_conn_t *conn;
1369         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1370         unsigned long flags;
1371         int rc;
1372
1373         /*
1374          * If I get here, I've committed to send, so I complete the tx with
1375          * failure on any problems
1376          */
1377         LASSERT(!tx || !tx->tx_conn); /* only set when assigned a conn */
1378         LASSERT(!tx || tx->tx_nwrq > 0);     /* work items have been set up */
1379
1380         /*
1381          * First time, just use a read lock since I expect to find my peer
1382          * connected
1383          */
1384         read_lock_irqsave(g_lock, flags);
1385
1386         peer = kiblnd_find_peer_locked(nid);
1387         if (peer && !list_empty(&peer->ibp_conns)) {
1388                 /* Found a peer with an established connection */
1389                 conn = kiblnd_get_conn_locked(peer);
1390                 kiblnd_conn_addref(conn); /* 1 ref for me... */
1391
1392                 read_unlock_irqrestore(g_lock, flags);
1393
1394                 if (tx)
1395                         kiblnd_queue_tx(tx, conn);
1396                 kiblnd_conn_decref(conn); /* ...to here */
1397                 return;
1398         }
1399
1400         read_unlock(g_lock);
1401         /* Re-try with a write lock */
1402         write_lock(g_lock);
1403
1404         peer = kiblnd_find_peer_locked(nid);
1405         if (peer) {
1406                 if (list_empty(&peer->ibp_conns)) {
1407                         /* found a peer, but it's still connecting... */
1408                         LASSERT(kiblnd_peer_connecting(peer));
1409                         if (tx)
1410                                 list_add_tail(&tx->tx_list,
1411                                               &peer->ibp_tx_queue);
1412                         write_unlock_irqrestore(g_lock, flags);
1413                 } else {
1414                         conn = kiblnd_get_conn_locked(peer);
1415                         kiblnd_conn_addref(conn); /* 1 ref for me... */
1416
1417                         write_unlock_irqrestore(g_lock, flags);
1418
1419                         if (tx)
1420                                 kiblnd_queue_tx(tx, conn);
1421                         kiblnd_conn_decref(conn); /* ...to here */
1422                 }
1423                 return;
1424         }
1425
1426         write_unlock_irqrestore(g_lock, flags);
1427
1428         /* Allocate a peer ready to add to the peer table and retry */
1429         rc = kiblnd_create_peer(ni, &peer, nid);
1430         if (rc) {
1431                 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1432                 if (tx) {
1433                         tx->tx_status = -EHOSTUNREACH;
1434                         tx->tx_waiting = 0;
1435                         kiblnd_tx_done(ni, tx);
1436                 }
1437                 return;
1438         }
1439
1440         write_lock_irqsave(g_lock, flags);
1441
1442         peer2 = kiblnd_find_peer_locked(nid);
1443         if (peer2) {
1444                 if (list_empty(&peer2->ibp_conns)) {
1445                         /* found a peer, but it's still connecting... */
1446                         LASSERT(kiblnd_peer_connecting(peer2));
1447                         if (tx)
1448                                 list_add_tail(&tx->tx_list,
1449                                               &peer2->ibp_tx_queue);
1450                         write_unlock_irqrestore(g_lock, flags);
1451                 } else {
1452                         conn = kiblnd_get_conn_locked(peer2);
1453                         kiblnd_conn_addref(conn); /* 1 ref for me... */
1454
1455                         write_unlock_irqrestore(g_lock, flags);
1456
1457                         if (tx)
1458                                 kiblnd_queue_tx(tx, conn);
1459                         kiblnd_conn_decref(conn); /* ...to here */
1460                 }
1461
1462                 kiblnd_peer_decref(peer);
1463                 return;
1464         }
1465
1466         /* Brand new peer */
1467         LASSERT(!peer->ibp_connecting);
1468         peer->ibp_connecting = 1;
1469
1470         /* always called with a ref on ni, which prevents ni being shutdown */
1471         LASSERT(!((kib_net_t *)ni->ni_data)->ibn_shutdown);
1472
1473         if (tx)
1474                 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1475
1476         kiblnd_peer_addref(peer);
1477         list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1478
1479         write_unlock_irqrestore(g_lock, flags);
1480
1481         kiblnd_connect_peer(peer);
1482         kiblnd_peer_decref(peer);
1483 }
1484
1485 int
1486 kiblnd_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1487 {
1488         lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1489         int type = lntmsg->msg_type;
1490         lnet_process_id_t target = lntmsg->msg_target;
1491         int target_is_router = lntmsg->msg_target_is_router;
1492         int routing = lntmsg->msg_routing;
1493         unsigned int payload_niov = lntmsg->msg_niov;
1494         struct kvec *payload_iov = lntmsg->msg_iov;
1495         lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1496         unsigned int payload_offset = lntmsg->msg_offset;
1497         unsigned int payload_nob = lntmsg->msg_len;
1498         kib_msg_t *ibmsg;
1499         kib_rdma_desc_t  *rd;
1500         kib_tx_t *tx;
1501         int nob;
1502         int rc;
1503
1504         /* NB 'private' is different depending on what we're sending.... */
1505
1506         CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1507                payload_nob, payload_niov, libcfs_id2str(target));
1508
1509         LASSERT(!payload_nob || payload_niov > 0);
1510         LASSERT(payload_niov <= LNET_MAX_IOV);
1511
1512         /* Thread context */
1513         LASSERT(!in_interrupt());
1514         /* payload is either all vaddrs or all pages */
1515         LASSERT(!(payload_kiov && payload_iov));
1516
1517         switch (type) {
1518         default:
1519                 LBUG();
1520                 return -EIO;
1521
1522         case LNET_MSG_ACK:
1523                 LASSERT(!payload_nob);
1524                 break;
1525
1526         case LNET_MSG_GET:
1527                 if (routing || target_is_router)
1528                         break;            /* send IMMEDIATE */
1529
1530                 /* is the REPLY message too small for RDMA? */
1531                 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1532                 if (nob <= IBLND_MSG_SIZE)
1533                         break;            /* send IMMEDIATE */
1534
1535                 tx = kiblnd_get_idle_tx(ni, target.nid);
1536                 if (!tx) {
1537                         CERROR("Can't allocate txd for GET to %s\n",
1538                                libcfs_nid2str(target.nid));
1539                         return -ENOMEM;
1540                 }
1541
1542                 ibmsg = tx->tx_msg;
1543                 rd = &ibmsg->ibm_u.get.ibgm_rd;
1544                 if (!(lntmsg->msg_md->md_options & LNET_MD_KIOV))
1545                         rc = kiblnd_setup_rd_iov(ni, tx, rd,
1546                                                  lntmsg->msg_md->md_niov,
1547                                                  lntmsg->msg_md->md_iov.iov,
1548                                                  0, lntmsg->msg_md->md_length);
1549                 else
1550                         rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1551                                                   lntmsg->msg_md->md_niov,
1552                                                   lntmsg->msg_md->md_iov.kiov,
1553                                                   0, lntmsg->msg_md->md_length);
1554                 if (rc) {
1555                         CERROR("Can't setup GET sink for %s: %d\n",
1556                                libcfs_nid2str(target.nid), rc);
1557                         kiblnd_tx_done(ni, tx);
1558                         return -EIO;
1559                 }
1560
1561                 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[rd->rd_nfrags]);
1562                 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1563                 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1564
1565                 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1566
1567                 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1568                 if (!tx->tx_lntmsg[1]) {
1569                         CERROR("Can't create reply for GET -> %s\n",
1570                                libcfs_nid2str(target.nid));
1571                         kiblnd_tx_done(ni, tx);
1572                         return -EIO;
1573                 }
1574
1575                 tx->tx_lntmsg[0] = lntmsg;      /* finalise lntmsg[0,1] on completion */
1576                 tx->tx_waiting = 1;          /* waiting for GET_DONE */
1577                 kiblnd_launch_tx(ni, tx, target.nid);
1578                 return 0;
1579
1580         case LNET_MSG_REPLY:
1581         case LNET_MSG_PUT:
1582                 /* Is the payload small enough not to need RDMA? */
1583                 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1584                 if (nob <= IBLND_MSG_SIZE)
1585                         break;            /* send IMMEDIATE */
1586
1587                 tx = kiblnd_get_idle_tx(ni, target.nid);
1588                 if (!tx) {
1589                         CERROR("Can't allocate %s txd for %s\n",
1590                                type == LNET_MSG_PUT ? "PUT" : "REPLY",
1591                                libcfs_nid2str(target.nid));
1592                         return -ENOMEM;
1593                 }
1594
1595                 if (!payload_kiov)
1596                         rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1597                                                  payload_niov, payload_iov,
1598                                                  payload_offset, payload_nob);
1599                 else
1600                         rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1601                                                   payload_niov, payload_kiov,
1602                                                   payload_offset, payload_nob);
1603                 if (rc) {
1604                         CERROR("Can't setup PUT src for %s: %d\n",
1605                                libcfs_nid2str(target.nid), rc);
1606                         kiblnd_tx_done(ni, tx);
1607                         return -EIO;
1608                 }
1609
1610                 ibmsg = tx->tx_msg;
1611                 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1612                 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1613                 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1614
1615                 tx->tx_lntmsg[0] = lntmsg;      /* finalise lntmsg on completion */
1616                 tx->tx_waiting = 1;          /* waiting for PUT_{ACK,NAK} */
1617                 kiblnd_launch_tx(ni, tx, target.nid);
1618                 return 0;
1619         }
1620
1621         /* send IMMEDIATE */
1622
1623         LASSERT(offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1624                  <= IBLND_MSG_SIZE);
1625
1626         tx = kiblnd_get_idle_tx(ni, target.nid);
1627         if (!tx) {
1628                 CERROR("Can't send %d to %s: tx descs exhausted\n",
1629                        type, libcfs_nid2str(target.nid));
1630                 return -ENOMEM;
1631         }
1632
1633         ibmsg = tx->tx_msg;
1634         ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1635
1636         if (payload_kiov)
1637                 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1638                                     offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1639                                     payload_niov, payload_kiov,
1640                                     payload_offset, payload_nob);
1641         else
1642                 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1643                                    offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1644                                    payload_niov, payload_iov,
1645                                    payload_offset, payload_nob);
1646
1647         nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1648         kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1649
1650         tx->tx_lntmsg[0] = lntmsg;            /* finalise lntmsg on completion */
1651         kiblnd_launch_tx(ni, tx, target.nid);
1652         return 0;
1653 }
1654
1655 static void
1656 kiblnd_reply(lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1657 {
1658         lnet_process_id_t target = lntmsg->msg_target;
1659         unsigned int niov = lntmsg->msg_niov;
1660         struct kvec *iov = lntmsg->msg_iov;
1661         lnet_kiov_t *kiov = lntmsg->msg_kiov;
1662         unsigned int offset = lntmsg->msg_offset;
1663         unsigned int nob = lntmsg->msg_len;
1664         kib_tx_t *tx;
1665         int rc;
1666
1667         tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1668         if (!tx) {
1669                 CERROR("Can't get tx for REPLY to %s\n",
1670                        libcfs_nid2str(target.nid));
1671                 goto failed_0;
1672         }
1673
1674         if (!nob)
1675                 rc = 0;
1676         else if (!kiov)
1677                 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1678                                          niov, iov, offset, nob);
1679         else
1680                 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1681                                           niov, kiov, offset, nob);
1682
1683         if (rc) {
1684                 CERROR("Can't setup GET src for %s: %d\n",
1685                        libcfs_nid2str(target.nid), rc);
1686                 goto failed_1;
1687         }
1688
1689         rc = kiblnd_init_rdma(rx->rx_conn, tx,
1690                               IBLND_MSG_GET_DONE, nob,
1691                               &rx->rx_msg->ibm_u.get.ibgm_rd,
1692                               rx->rx_msg->ibm_u.get.ibgm_cookie);
1693         if (rc < 0) {
1694                 CERROR("Can't setup rdma for GET from %s: %d\n",
1695                        libcfs_nid2str(target.nid), rc);
1696                 goto failed_1;
1697         }
1698
1699         if (!nob) {
1700                 /* No RDMA: local completion may happen now! */
1701                 lnet_finalize(ni, lntmsg, 0);
1702         } else {
1703                 /* RDMA: lnet_finalize(lntmsg) when it completes */
1704                 tx->tx_lntmsg[0] = lntmsg;
1705         }
1706
1707         kiblnd_queue_tx(tx, rx->rx_conn);
1708         return;
1709
1710  failed_1:
1711         kiblnd_tx_done(ni, tx);
1712  failed_0:
1713         lnet_finalize(ni, lntmsg, -EIO);
1714 }
1715
1716 int
1717 kiblnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1718             unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1719             unsigned int offset, unsigned int mlen, unsigned int rlen)
1720 {
1721         kib_rx_t *rx = private;
1722         kib_msg_t *rxmsg = rx->rx_msg;
1723         kib_conn_t *conn = rx->rx_conn;
1724         kib_tx_t *tx;
1725         int nob;
1726         int post_credit = IBLND_POSTRX_PEER_CREDIT;
1727         int rc = 0;
1728
1729         LASSERT(mlen <= rlen);
1730         LASSERT(!in_interrupt());
1731         /* Either all pages or all vaddrs */
1732         LASSERT(!(kiov && iov));
1733
1734         switch (rxmsg->ibm_type) {
1735         default:
1736                 LBUG();
1737
1738         case IBLND_MSG_IMMEDIATE:
1739                 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1740                 if (nob > rx->rx_nob) {
1741                         CERROR("Immediate message from %s too big: %d(%d)\n",
1742                                libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1743                                nob, rx->rx_nob);
1744                         rc = -EPROTO;
1745                         break;
1746                 }
1747
1748                 if (kiov)
1749                         lnet_copy_flat2kiov(niov, kiov, offset,
1750                                             IBLND_MSG_SIZE, rxmsg,
1751                                             offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1752                                             mlen);
1753                 else
1754                         lnet_copy_flat2iov(niov, iov, offset,
1755                                            IBLND_MSG_SIZE, rxmsg,
1756                                            offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1757                                            mlen);
1758                 lnet_finalize(ni, lntmsg, 0);
1759                 break;
1760
1761         case IBLND_MSG_PUT_REQ: {
1762                 kib_msg_t       *txmsg;
1763                 kib_rdma_desc_t *rd;
1764
1765                 if (!mlen) {
1766                         lnet_finalize(ni, lntmsg, 0);
1767                         kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1768                                                rxmsg->ibm_u.putreq.ibprm_cookie);
1769                         break;
1770                 }
1771
1772                 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1773                 if (!tx) {
1774                         CERROR("Can't allocate tx for %s\n",
1775                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
1776                         /* Not replying will break the connection */
1777                         rc = -ENOMEM;
1778                         break;
1779                 }
1780
1781                 txmsg = tx->tx_msg;
1782                 rd = &txmsg->ibm_u.putack.ibpam_rd;
1783                 if (!kiov)
1784                         rc = kiblnd_setup_rd_iov(ni, tx, rd,
1785                                                  niov, iov, offset, mlen);
1786                 else
1787                         rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1788                                                   niov, kiov, offset, mlen);
1789                 if (rc) {
1790                         CERROR("Can't setup PUT sink for %s: %d\n",
1791                                libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1792                         kiblnd_tx_done(ni, tx);
1793                         /* tell peer it's over */
1794                         kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1795                                                rxmsg->ibm_u.putreq.ibprm_cookie);
1796                         break;
1797                 }
1798
1799                 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[rd->rd_nfrags]);
1800                 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1801                 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1802
1803                 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1804
1805                 tx->tx_lntmsg[0] = lntmsg;      /* finalise lntmsg on completion */
1806                 tx->tx_waiting = 1;          /* waiting for PUT_DONE */
1807                 kiblnd_queue_tx(tx, conn);
1808
1809                 /* reposted buffer reserved for PUT_DONE */
1810                 post_credit = IBLND_POSTRX_NO_CREDIT;
1811                 break;
1812                 }
1813
1814         case IBLND_MSG_GET_REQ:
1815                 if (lntmsg) {
1816                         /* Optimized GET; RDMA lntmsg's payload */
1817                         kiblnd_reply(ni, rx, lntmsg);
1818                 } else {
1819                         /* GET didn't match anything */
1820                         kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1821                                                -ENODATA,
1822                                                rxmsg->ibm_u.get.ibgm_cookie);
1823                 }
1824                 break;
1825         }
1826
1827         kiblnd_post_rx(rx, post_credit);
1828         return rc;
1829 }
1830
1831 int
1832 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1833 {
1834         struct task_struct *task = kthread_run(fn, arg, "%s", name);
1835
1836         if (IS_ERR(task))
1837                 return PTR_ERR(task);
1838
1839         atomic_inc(&kiblnd_data.kib_nthreads);
1840         return 0;
1841 }
1842
1843 static void
1844 kiblnd_thread_fini(void)
1845 {
1846         atomic_dec(&kiblnd_data.kib_nthreads);
1847 }
1848
1849 static void
1850 kiblnd_peer_alive(kib_peer_t *peer)
1851 {
1852         /* This is racy, but everyone's only writing cfs_time_current() */
1853         peer->ibp_last_alive = cfs_time_current();
1854         mb();
1855 }
1856
1857 static void
1858 kiblnd_peer_notify(kib_peer_t *peer)
1859 {
1860         int error = 0;
1861         unsigned long last_alive = 0;
1862         unsigned long flags;
1863
1864         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1865
1866         if (kiblnd_peer_idle(peer) && peer->ibp_error) {
1867                 error = peer->ibp_error;
1868                 peer->ibp_error = 0;
1869
1870                 last_alive = peer->ibp_last_alive;
1871         }
1872
1873         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1874
1875         if (error)
1876                 lnet_notify(peer->ibp_ni,
1877                             peer->ibp_nid, 0, last_alive);
1878 }
1879
1880 void
1881 kiblnd_close_conn_locked(kib_conn_t *conn, int error)
1882 {
1883         /*
1884          * This just does the immediate housekeeping. 'error' is zero for a
1885          * normal shutdown which can happen only after the connection has been
1886          * established.  If the connection is established, schedule the
1887          * connection to be finished off by the connd. Otherwise the connd is
1888          * already dealing with it (either to set it up or tear it down).
1889          * Caller holds kib_global_lock exclusively in irq context
1890          */
1891         kib_peer_t *peer = conn->ibc_peer;
1892         kib_dev_t *dev;
1893         unsigned long flags;
1894
1895         LASSERT(error || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1896
1897         if (error && !conn->ibc_comms_error)
1898                 conn->ibc_comms_error = error;
1899
1900         if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1901                 return; /* already being handled  */
1902
1903         if (!error &&
1904             list_empty(&conn->ibc_tx_noops) &&
1905             list_empty(&conn->ibc_tx_queue) &&
1906             list_empty(&conn->ibc_tx_queue_rsrvd) &&
1907             list_empty(&conn->ibc_tx_queue_nocred) &&
1908             list_empty(&conn->ibc_active_txs)) {
1909                 CDEBUG(D_NET, "closing conn to %s\n",
1910                        libcfs_nid2str(peer->ibp_nid));
1911         } else {
1912                 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1913                         libcfs_nid2str(peer->ibp_nid), error,
1914                         list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1915                         list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1916                         list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
1917                         list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
1918                         list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1919         }
1920
1921         dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
1922         list_del(&conn->ibc_list);
1923         /* connd (see below) takes over ibc_list's ref */
1924
1925         if (list_empty(&peer->ibp_conns) &&    /* no more conns */
1926             kiblnd_peer_active(peer)) {  /* still in peer table */
1927                 kiblnd_unlink_peer_locked(peer);
1928
1929                 /* set/clear error on last conn */
1930                 peer->ibp_error = conn->ibc_comms_error;
1931         }
1932
1933         kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1934
1935         if (error &&
1936             kiblnd_dev_can_failover(dev)) {
1937                 list_add_tail(&dev->ibd_fail_list,
1938                               &kiblnd_data.kib_failed_devs);
1939                 wake_up(&kiblnd_data.kib_failover_waitq);
1940         }
1941
1942         spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1943
1944         list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1945         wake_up(&kiblnd_data.kib_connd_waitq);
1946
1947         spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1948 }
1949
1950 void
1951 kiblnd_close_conn(kib_conn_t *conn, int error)
1952 {
1953         unsigned long flags;
1954
1955         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1956
1957         kiblnd_close_conn_locked(conn, error);
1958
1959         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1960 }
1961
1962 static void
1963 kiblnd_handle_early_rxs(kib_conn_t *conn)
1964 {
1965         unsigned long flags;
1966         kib_rx_t *rx;
1967         kib_rx_t *tmp;
1968
1969         LASSERT(!in_interrupt());
1970         LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1971
1972         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1973         list_for_each_entry_safe(rx, tmp, &conn->ibc_early_rxs, rx_list) {
1974                 list_del(&rx->rx_list);
1975                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1976
1977                 kiblnd_handle_rx(rx);
1978
1979                 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1980         }
1981         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1982 }
1983
1984 static void
1985 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
1986 {
1987         LIST_HEAD(zombies);
1988         struct list_head *tmp;
1989         struct list_head *nxt;
1990         kib_tx_t *tx;
1991
1992         spin_lock(&conn->ibc_lock);
1993
1994         list_for_each_safe(tmp, nxt, txs) {
1995                 tx = list_entry(tmp, kib_tx_t, tx_list);
1996
1997                 if (txs == &conn->ibc_active_txs) {
1998                         LASSERT(!tx->tx_queued);
1999                         LASSERT(tx->tx_waiting || tx->tx_sending);
2000                 } else {
2001                         LASSERT(tx->tx_queued);
2002                 }
2003
2004                 tx->tx_status = -ECONNABORTED;
2005                 tx->tx_waiting = 0;
2006
2007                 if (!tx->tx_sending) {
2008                         tx->tx_queued = 0;
2009                         list_del(&tx->tx_list);
2010                         list_add(&tx->tx_list, &zombies);
2011                 }
2012         }
2013
2014         spin_unlock(&conn->ibc_lock);
2015
2016         kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
2017 }
2018
2019 static void
2020 kiblnd_finalise_conn(kib_conn_t *conn)
2021 {
2022         LASSERT(!in_interrupt());
2023         LASSERT(conn->ibc_state > IBLND_CONN_INIT);
2024
2025         kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2026
2027         /*
2028          * abort_receives moves QP state to IB_QPS_ERR.  This is only required
2029          * for connections that didn't get as far as being connected, because
2030          * rdma_disconnect() does this for free.
2031          */
2032         kiblnd_abort_receives(conn);
2033
2034         /*
2035          * Complete all tx descs not waiting for sends to complete.
2036          * NB we should be safe from RDMA now that the QP has changed state
2037          */
2038         kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2039         kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2040         kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2041         kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2042         kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2043
2044         kiblnd_handle_early_rxs(conn);
2045 }
2046
2047 static void
2048 kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error)
2049 {
2050         LIST_HEAD(zombies);
2051         unsigned long flags;
2052
2053         LASSERT(error);
2054         LASSERT(!in_interrupt());
2055
2056         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2057
2058         if (active) {
2059                 LASSERT(peer->ibp_connecting > 0);
2060                 peer->ibp_connecting--;
2061         } else {
2062                 LASSERT(peer->ibp_accepting > 0);
2063                 peer->ibp_accepting--;
2064         }
2065
2066         if (kiblnd_peer_connecting(peer)) {
2067                 /* another connection attempt under way... */
2068                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2069                                         flags);
2070                 return;
2071         }
2072
2073         peer->ibp_reconnected = 0;
2074         if (list_empty(&peer->ibp_conns)) {
2075                 /* Take peer's blocked transmits to complete with error */
2076                 list_add(&zombies, &peer->ibp_tx_queue);
2077                 list_del_init(&peer->ibp_tx_queue);
2078
2079                 if (kiblnd_peer_active(peer))
2080                         kiblnd_unlink_peer_locked(peer);
2081
2082                 peer->ibp_error = error;
2083         } else {
2084                 /* Can't have blocked transmits if there are connections */
2085                 LASSERT(list_empty(&peer->ibp_tx_queue));
2086         }
2087
2088         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2089
2090         kiblnd_peer_notify(peer);
2091
2092         if (list_empty(&zombies))
2093                 return;
2094
2095         CNETERR("Deleting messages for %s: connection failed\n",
2096                 libcfs_nid2str(peer->ibp_nid));
2097
2098         kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2099 }
2100
2101 static void
2102 kiblnd_connreq_done(kib_conn_t *conn, int status)
2103 {
2104         kib_peer_t *peer = conn->ibc_peer;
2105         kib_tx_t *tx;
2106         kib_tx_t *tmp;
2107         struct list_head txs;
2108         unsigned long flags;
2109         int active;
2110
2111         active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2112
2113         CDEBUG(D_NET, "%s: active(%d), version(%x), status(%d)\n",
2114                libcfs_nid2str(peer->ibp_nid), active,
2115                conn->ibc_version, status);
2116
2117         LASSERT(!in_interrupt());
2118         LASSERT((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2119                  peer->ibp_connecting > 0) ||
2120                  (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2121                  peer->ibp_accepting > 0));
2122
2123         LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2124         conn->ibc_connvars = NULL;
2125
2126         if (status) {
2127                 /* failed to establish connection */
2128                 kiblnd_peer_connect_failed(peer, active, status);
2129                 kiblnd_finalise_conn(conn);
2130                 return;
2131         }
2132
2133         /* connection established */
2134         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2135
2136         conn->ibc_last_send = jiffies;
2137         kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2138         kiblnd_peer_alive(peer);
2139
2140         /*
2141          * Add conn to peer's list and nuke any dangling conns from a different
2142          * peer instance...
2143          */
2144         kiblnd_conn_addref(conn);              /* +1 ref for ibc_list */
2145         list_add(&conn->ibc_list, &peer->ibp_conns);
2146         peer->ibp_reconnected = 0;
2147         if (active)
2148                 peer->ibp_connecting--;
2149         else
2150                 peer->ibp_accepting--;
2151
2152         if (!peer->ibp_version) {
2153                 peer->ibp_version     = conn->ibc_version;
2154                 peer->ibp_incarnation = conn->ibc_incarnation;
2155         }
2156
2157         if (peer->ibp_version     != conn->ibc_version ||
2158             peer->ibp_incarnation != conn->ibc_incarnation) {
2159                 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2160                                                 conn->ibc_incarnation);
2161                 peer->ibp_version     = conn->ibc_version;
2162                 peer->ibp_incarnation = conn->ibc_incarnation;
2163         }
2164
2165         /* grab pending txs while I have the lock */
2166         list_add(&txs, &peer->ibp_tx_queue);
2167         list_del_init(&peer->ibp_tx_queue);
2168
2169         if (!kiblnd_peer_active(peer) ||        /* peer has been deleted */
2170             conn->ibc_comms_error) {       /* error has happened already */
2171                 lnet_ni_t *ni = peer->ibp_ni;
2172
2173                 /* start to shut down connection */
2174                 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2175                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2176
2177                 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2178
2179                 return;
2180         }
2181
2182         /**
2183          * refcount taken by cmid is not reliable after I released the glock
2184          * because this connection is visible to other threads now, another
2185          * thread can find and close this connection right after I released
2186          * the glock, if kiblnd_cm_callback for RDMA_CM_EVENT_DISCONNECTED is
2187          * called, it can release the connection refcount taken by cmid.
2188          * It means the connection could be destroyed before I finish my
2189          * operations on it.
2190          */
2191         kiblnd_conn_addref(conn);
2192         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2193
2194         /* Schedule blocked txs */
2195         spin_lock(&conn->ibc_lock);
2196         list_for_each_entry_safe(tx, tmp, &txs, tx_list) {
2197                 list_del(&tx->tx_list);
2198
2199                 kiblnd_queue_tx_locked(tx, conn);
2200         }
2201         spin_unlock(&conn->ibc_lock);
2202
2203         kiblnd_check_sends(conn);
2204
2205         /* schedule blocked rxs */
2206         kiblnd_handle_early_rxs(conn);
2207
2208         kiblnd_conn_decref(conn);
2209 }
2210
2211 static void
2212 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2213 {
2214         int rc;
2215
2216         rc = rdma_reject(cmid, rej, sizeof(*rej));
2217
2218         if (rc)
2219                 CWARN("Error %d sending reject\n", rc);
2220 }
2221
2222 static int
2223 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2224 {
2225         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2226         kib_msg_t *reqmsg = priv;
2227         kib_msg_t *ackmsg;
2228         kib_dev_t *ibdev;
2229         kib_peer_t *peer;
2230         kib_peer_t *peer2;
2231         kib_conn_t *conn;
2232         lnet_ni_t *ni  = NULL;
2233         kib_net_t *net = NULL;
2234         lnet_nid_t nid;
2235         struct rdma_conn_param cp;
2236         kib_rej_t rej;
2237         int version = IBLND_MSG_VERSION;
2238         unsigned long flags;
2239         int rc;
2240         struct sockaddr_in *peer_addr;
2241
2242         LASSERT(!in_interrupt());
2243
2244         /* cmid inherits 'context' from the corresponding listener id */
2245         ibdev = (kib_dev_t *)cmid->context;
2246         LASSERT(ibdev);
2247
2248         memset(&rej, 0, sizeof(rej));
2249         rej.ibr_magic = IBLND_MSG_MAGIC;
2250         rej.ibr_why = IBLND_REJECT_FATAL;
2251         rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2252
2253         peer_addr = (struct sockaddr_in *)&cmid->route.addr.dst_addr;
2254         if (*kiblnd_tunables.kib_require_priv_port &&
2255             ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2256                 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2257
2258                 CERROR("Peer's port (%pI4h:%hu) is not privileged\n",
2259                        &ip, ntohs(peer_addr->sin_port));
2260                 goto failed;
2261         }
2262
2263         if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2264                 CERROR("Short connection request\n");
2265                 goto failed;
2266         }
2267
2268         /*
2269          * Future protocol version compatibility support!  If the
2270          * o2iblnd-specific protocol changes, or when LNET unifies
2271          * protocols over all LNDs, the initial connection will
2272          * negotiate a protocol version.  I trap this here to avoid
2273          * console errors; the reject tells the peer which protocol I
2274          * speak.
2275          */
2276         if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2277             reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2278                 goto failed;
2279         if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2280             reqmsg->ibm_version != IBLND_MSG_VERSION &&
2281             reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2282                 goto failed;
2283         if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2284             reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2285             reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2286                 goto failed;
2287
2288         rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2289         if (rc) {
2290                 CERROR("Can't parse connection request: %d\n", rc);
2291                 goto failed;
2292         }
2293
2294         nid = reqmsg->ibm_srcnid;
2295         ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2296
2297         if (ni) {
2298                 net = (kib_net_t *)ni->ni_data;
2299                 rej.ibr_incarnation = net->ibn_incarnation;
2300         }
2301
2302         if (!ni ||                       /* no matching net */
2303             ni->ni_nid != reqmsg->ibm_dstnid ||   /* right NET, wrong NID! */
2304             net->ibn_dev != ibdev) {          /* wrong device */
2305                 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): bad dst nid %s\n",
2306                        libcfs_nid2str(nid),
2307                        !ni ? "NA" : libcfs_nid2str(ni->ni_nid),
2308                        ibdev->ibd_ifname, ibdev->ibd_nnets,
2309                        &ibdev->ibd_ifip,
2310                        libcfs_nid2str(reqmsg->ibm_dstnid));
2311
2312                 goto failed;
2313         }
2314
2315        /* check time stamp as soon as possible */
2316         if (reqmsg->ibm_dststamp &&
2317             reqmsg->ibm_dststamp != net->ibn_incarnation) {
2318                 CWARN("Stale connection request\n");
2319                 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2320                 goto failed;
2321         }
2322
2323         /* I can accept peer's version */
2324         version = reqmsg->ibm_version;
2325
2326         if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2327                 CERROR("Unexpected connreq msg type: %x from %s\n",
2328                        reqmsg->ibm_type, libcfs_nid2str(nid));
2329                 goto failed;
2330         }
2331
2332         if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2333             kiblnd_msg_queue_size(version, ni)) {
2334                 CERROR("Can't accept conn from %s, queue depth too large: %d (<=%d wanted)\n",
2335                        libcfs_nid2str(nid),
2336                        reqmsg->ibm_u.connparams.ibcp_queue_depth,
2337                        kiblnd_msg_queue_size(version, ni));
2338
2339                 if (version == IBLND_MSG_VERSION)
2340                         rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2341
2342                 goto failed;
2343         }
2344
2345         if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2346             kiblnd_rdma_frags(version, ni)) {
2347                 CWARN("Can't accept conn from %s (version %x): max_frags %d too large (%d wanted)\n",
2348                       libcfs_nid2str(nid), version,
2349                       reqmsg->ibm_u.connparams.ibcp_max_frags,
2350                       kiblnd_rdma_frags(version, ni));
2351
2352                 if (version >= IBLND_MSG_VERSION)
2353                         rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2354
2355                 goto failed;
2356         } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2357                    kiblnd_rdma_frags(version, ni) && !net->ibn_fmr_ps) {
2358                 CWARN("Can't accept conn from %s (version %x): max_frags %d incompatible without FMR pool (%d wanted)\n",
2359                       libcfs_nid2str(nid), version,
2360                       reqmsg->ibm_u.connparams.ibcp_max_frags,
2361                       kiblnd_rdma_frags(version, ni));
2362
2363                 if (version == IBLND_MSG_VERSION)
2364                         rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2365
2366                 goto failed;
2367         }
2368
2369         if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2370                 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2371                        libcfs_nid2str(nid),
2372                        reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2373                        IBLND_MSG_SIZE);
2374                 goto failed;
2375         }
2376
2377         /* assume 'nid' is a new peer; create  */
2378         rc = kiblnd_create_peer(ni, &peer, nid);
2379         if (rc) {
2380                 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2381                 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2382                 goto failed;
2383         }
2384
2385         /* We have validated the peer's parameters so use those */
2386         peer->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2387         peer->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2388
2389         write_lock_irqsave(g_lock, flags);
2390
2391         peer2 = kiblnd_find_peer_locked(nid);
2392         if (peer2) {
2393                 if (!peer2->ibp_version) {
2394                         peer2->ibp_version     = version;
2395                         peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2396                 }
2397
2398                 /* not the guy I've talked with */
2399                 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2400                     peer2->ibp_version     != version) {
2401                         kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2402
2403                         if (kiblnd_peer_active(peer2)) {
2404                                 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2405                                 peer2->ibp_version = version;
2406                         }
2407                         write_unlock_irqrestore(g_lock, flags);
2408
2409                         CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2410                               libcfs_nid2str(nid), peer2->ibp_version, version,
2411                               peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2412
2413                         kiblnd_peer_decref(peer);
2414                         rej.ibr_why = IBLND_REJECT_CONN_STALE;
2415                         goto failed;
2416                 }
2417
2418                 /* tie-break connection race in favour of the higher NID */
2419                 if (peer2->ibp_connecting &&
2420                     nid < ni->ni_nid) {
2421                         write_unlock_irqrestore(g_lock, flags);
2422
2423                         CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2424
2425                         kiblnd_peer_decref(peer);
2426                         rej.ibr_why = IBLND_REJECT_CONN_RACE;
2427                         goto failed;
2428                 }
2429
2430                 /**
2431                  * passive connection is allowed even this peer is waiting for
2432                  * reconnection.
2433                  */
2434                 peer2->ibp_reconnecting = 0;
2435                 peer2->ibp_accepting++;
2436                 kiblnd_peer_addref(peer2);
2437
2438                 /**
2439                  * Race with kiblnd_launch_tx (active connect) to create peer
2440                  * so copy validated parameters since we now know what the
2441                  * peer's limits are
2442                  */
2443                 peer2->ibp_max_frags = peer->ibp_max_frags;
2444                 peer2->ibp_queue_depth = peer->ibp_queue_depth;
2445
2446                 write_unlock_irqrestore(g_lock, flags);
2447                 kiblnd_peer_decref(peer);
2448                 peer = peer2;
2449         } else {
2450                 /* Brand new peer */
2451                 LASSERT(!peer->ibp_accepting);
2452                 LASSERT(!peer->ibp_version &&
2453                         !peer->ibp_incarnation);
2454
2455                 peer->ibp_accepting   = 1;
2456                 peer->ibp_version     = version;
2457                 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2458
2459                 /* I have a ref on ni that prevents it being shutdown */
2460                 LASSERT(!net->ibn_shutdown);
2461
2462                 kiblnd_peer_addref(peer);
2463                 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2464
2465                 write_unlock_irqrestore(g_lock, flags);
2466         }
2467
2468         conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT,
2469                                   version);
2470         if (!conn) {
2471                 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2472                 kiblnd_peer_decref(peer);
2473                 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2474                 goto failed;
2475         }
2476
2477         /*
2478          * conn now "owns" cmid, so I return success from here on to ensure the
2479          * CM callback doesn't destroy cmid.
2480          */
2481         conn->ibc_incarnation      = reqmsg->ibm_srcstamp;
2482         conn->ibc_credits          = conn->ibc_queue_depth;
2483         conn->ibc_reserved_credits = conn->ibc_queue_depth;
2484         LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2485                 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2486
2487         ackmsg = &conn->ibc_connvars->cv_msg;
2488         memset(ackmsg, 0, sizeof(*ackmsg));
2489
2490         kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2491                         sizeof(ackmsg->ibm_u.connparams));
2492         ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2493         ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2494         ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2495
2496         kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2497
2498         memset(&cp, 0, sizeof(cp));
2499         cp.private_data = ackmsg;
2500         cp.private_data_len = ackmsg->ibm_nob;
2501         cp.responder_resources = 0;          /* No atomic ops or RDMA reads */
2502         cp.initiator_depth = 0;
2503         cp.flow_control = 1;
2504         cp.retry_count = *kiblnd_tunables.kib_retry_count;
2505         cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2506
2507         CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2508
2509         rc = rdma_accept(cmid, &cp);
2510         if (rc) {
2511                 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2512                 rej.ibr_version = version;
2513                 rej.ibr_why     = IBLND_REJECT_FATAL;
2514
2515                 kiblnd_reject(cmid, &rej);
2516                 kiblnd_connreq_done(conn, rc);
2517                 kiblnd_conn_decref(conn);
2518         }
2519
2520         lnet_ni_decref(ni);
2521         return 0;
2522
2523  failed:
2524         if (ni)
2525                 lnet_ni_decref(ni);
2526
2527         rej.ibr_version             = version;
2528         rej.ibr_cp.ibcp_queue_depth = kiblnd_msg_queue_size(version, ni);
2529         rej.ibr_cp.ibcp_max_frags = kiblnd_rdma_frags(version, ni);
2530         kiblnd_reject(cmid, &rej);
2531
2532         return -ECONNREFUSED;
2533 }
2534
2535 static void
2536 kiblnd_check_reconnect(kib_conn_t *conn, int version,
2537                        __u64 incarnation, int why, kib_connparams_t *cp)
2538 {
2539         rwlock_t *glock = &kiblnd_data.kib_global_lock;
2540         kib_peer_t *peer = conn->ibc_peer;
2541         char *reason;
2542         int msg_size = IBLND_MSG_SIZE;
2543         int frag_num = -1;
2544         int queue_dep = -1;
2545         bool reconnect;
2546         unsigned long flags;
2547
2548         LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2549         LASSERT(peer->ibp_connecting > 0);     /* 'conn' at least */
2550         LASSERT(!peer->ibp_reconnecting);
2551
2552         if (cp) {
2553                 msg_size = cp->ibcp_max_msg_size;
2554                 frag_num = cp->ibcp_max_frags;
2555                 queue_dep = cp->ibcp_queue_depth;
2556         }
2557
2558         write_lock_irqsave(glock, flags);
2559         /**
2560          * retry connection if it's still needed and no other connection
2561          * attempts (active or passive) are in progress
2562          * NB: reconnect is still needed even when ibp_tx_queue is
2563          * empty if ibp_version != version because reconnect may be
2564          * initiated by kiblnd_query()
2565          */
2566         reconnect = (!list_empty(&peer->ibp_tx_queue) ||
2567                      peer->ibp_version != version) &&
2568                     peer->ibp_connecting == 1 &&
2569                     !peer->ibp_accepting;
2570         if (!reconnect) {
2571                 reason = "no need";
2572                 goto out;
2573         }
2574
2575         switch (why) {
2576         default:
2577                 reason = "Unknown";
2578                 break;
2579
2580         case IBLND_REJECT_RDMA_FRAGS: {
2581                 struct lnet_ioctl_config_lnd_tunables *tunables;
2582
2583                 if (!cp) {
2584                         reason = "can't negotiate max frags";
2585                         goto out;
2586                 }
2587                 tunables = peer->ibp_ni->ni_lnd_tunables;
2588                 if (!tunables->lt_tun_u.lt_o2ib.lnd_map_on_demand) {
2589                         reason = "map_on_demand must be enabled";
2590                         goto out;
2591                 }
2592                 if (conn->ibc_max_frags <= frag_num) {
2593                         reason = "unsupported max frags";
2594                         goto out;
2595                 }
2596
2597                 peer->ibp_max_frags = frag_num;
2598                 reason = "rdma fragments";
2599                 break;
2600         }
2601         case IBLND_REJECT_MSG_QUEUE_SIZE:
2602                 if (!cp) {
2603                         reason = "can't negotiate queue depth";
2604                         goto out;
2605                 }
2606                 if (conn->ibc_queue_depth <= queue_dep) {
2607                         reason = "unsupported queue depth";
2608                         goto out;
2609                 }
2610
2611                 peer->ibp_queue_depth = queue_dep;
2612                 reason = "queue depth";
2613                 break;
2614
2615         case IBLND_REJECT_CONN_STALE:
2616                 reason = "stale";
2617                 break;
2618
2619         case IBLND_REJECT_CONN_RACE:
2620                 reason = "conn race";
2621                 break;
2622
2623         case IBLND_REJECT_CONN_UNCOMPAT:
2624                 reason = "version negotiation";
2625                 break;
2626         }
2627
2628         conn->ibc_reconnect = 1;
2629         peer->ibp_reconnecting = 1;
2630         peer->ibp_version = version;
2631         if (incarnation)
2632                 peer->ibp_incarnation = incarnation;
2633 out:
2634         write_unlock_irqrestore(glock, flags);
2635
2636         CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2637                 libcfs_nid2str(peer->ibp_nid),
2638                 reconnect ? "reconnect" : "don't reconnect",
2639                 reason, IBLND_MSG_VERSION, version, msg_size,
2640                 conn->ibc_queue_depth, queue_dep,
2641                 conn->ibc_max_frags, frag_num);
2642         /**
2643          * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer
2644          * while destroying the zombie
2645          */
2646 }
2647
2648 static void
2649 kiblnd_rejected(kib_conn_t *conn, int reason, void *priv, int priv_nob)
2650 {
2651         kib_peer_t *peer = conn->ibc_peer;
2652
2653         LASSERT(!in_interrupt());
2654         LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2655
2656         switch (reason) {
2657         case IB_CM_REJ_STALE_CONN:
2658                 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2659                                        IBLND_REJECT_CONN_STALE, NULL);
2660                 break;
2661
2662         case IB_CM_REJ_INVALID_SERVICE_ID:
2663                 CNETERR("%s rejected: no listener at %d\n",
2664                         libcfs_nid2str(peer->ibp_nid),
2665                         *kiblnd_tunables.kib_service);
2666                 break;
2667
2668         case IB_CM_REJ_CONSUMER_DEFINED:
2669                 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2670                         kib_rej_t *rej = priv;
2671                         kib_connparams_t *cp = NULL;
2672                         int flip = 0;
2673                         __u64 incarnation = -1;
2674
2675                         /* NB. default incarnation is -1 because:
2676                          * a) V1 will ignore dst incarnation in connreq.
2677                          * b) V2 will provide incarnation while rejecting me,
2678                          *    -1 will be overwrote.
2679                          *
2680                          * if I try to connect to a V1 peer with V2 protocol,
2681                          * it rejected me then upgrade to V2, I have no idea
2682                          * about the upgrading and try to reconnect with V1,
2683                          * in this case upgraded V2 can find out I'm trying to
2684                          * talk to the old guy and reject me(incarnation is -1).
2685                          */
2686
2687                         if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2688                             rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2689                                 __swab32s(&rej->ibr_magic);
2690                                 __swab16s(&rej->ibr_version);
2691                                 flip = 1;
2692                         }
2693
2694                         if (priv_nob >= sizeof(kib_rej_t) &&
2695                             rej->ibr_version > IBLND_MSG_VERSION_1) {
2696                                 /*
2697                                  * priv_nob is always 148 in current version
2698                                  * of OFED, so we still need to check version.
2699                                  * (define of IB_CM_REJ_PRIVATE_DATA_SIZE)
2700                                  */
2701                                 cp = &rej->ibr_cp;
2702
2703                                 if (flip) {
2704                                         __swab64s(&rej->ibr_incarnation);
2705                                         __swab16s(&cp->ibcp_queue_depth);
2706                                         __swab16s(&cp->ibcp_max_frags);
2707                                         __swab32s(&cp->ibcp_max_msg_size);
2708                                 }
2709
2710                                 incarnation = rej->ibr_incarnation;
2711                         }
2712
2713                         if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2714                             rej->ibr_magic != LNET_PROTO_MAGIC) {
2715                                 CERROR("%s rejected: consumer defined fatal error\n",
2716                                        libcfs_nid2str(peer->ibp_nid));
2717                                 break;
2718                         }
2719
2720                         if (rej->ibr_version != IBLND_MSG_VERSION &&
2721                             rej->ibr_version != IBLND_MSG_VERSION_1) {
2722                                 CERROR("%s rejected: o2iblnd version %x error\n",
2723                                        libcfs_nid2str(peer->ibp_nid),
2724                                        rej->ibr_version);
2725                                 break;
2726                         }
2727
2728                         if (rej->ibr_why     == IBLND_REJECT_FATAL &&
2729                             rej->ibr_version == IBLND_MSG_VERSION_1) {
2730                                 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2731                                        libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2732
2733                                 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2734                                         rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2735                         }
2736
2737                         switch (rej->ibr_why) {
2738                         case IBLND_REJECT_CONN_RACE:
2739                         case IBLND_REJECT_CONN_STALE:
2740                         case IBLND_REJECT_CONN_UNCOMPAT:
2741                         case IBLND_REJECT_MSG_QUEUE_SIZE:
2742                         case IBLND_REJECT_RDMA_FRAGS:
2743                                 kiblnd_check_reconnect(conn, rej->ibr_version,
2744                                                        incarnation,
2745                                                        rej->ibr_why, cp);
2746                                 break;
2747
2748                         case IBLND_REJECT_NO_RESOURCES:
2749                                 CERROR("%s rejected: o2iblnd no resources\n",
2750                                        libcfs_nid2str(peer->ibp_nid));
2751                                 break;
2752
2753                         case IBLND_REJECT_FATAL:
2754                                 CERROR("%s rejected: o2iblnd fatal error\n",
2755                                        libcfs_nid2str(peer->ibp_nid));
2756                                 break;
2757
2758                         default:
2759                                 CERROR("%s rejected: o2iblnd reason %d\n",
2760                                        libcfs_nid2str(peer->ibp_nid),
2761                                        rej->ibr_why);
2762                                 break;
2763                         }
2764                         break;
2765                 }
2766                 /* fall through */
2767         default:
2768                 CNETERR("%s rejected: reason %d, size %d\n",
2769                         libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2770                 break;
2771         }
2772
2773         kiblnd_connreq_done(conn, -ECONNREFUSED);
2774 }
2775
2776 static void
2777 kiblnd_check_connreply(kib_conn_t *conn, void *priv, int priv_nob)
2778 {
2779         kib_peer_t *peer = conn->ibc_peer;
2780         lnet_ni_t *ni = peer->ibp_ni;
2781         kib_net_t *net = ni->ni_data;
2782         kib_msg_t *msg = priv;
2783         int ver = conn->ibc_version;
2784         int rc = kiblnd_unpack_msg(msg, priv_nob);
2785         unsigned long flags;
2786
2787         LASSERT(net);
2788
2789         if (rc) {
2790                 CERROR("Can't unpack connack from %s: %d\n",
2791                        libcfs_nid2str(peer->ibp_nid), rc);
2792                 goto failed;
2793         }
2794
2795         if (msg->ibm_type != IBLND_MSG_CONNACK) {
2796                 CERROR("Unexpected message %d from %s\n",
2797                        msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2798                 rc = -EPROTO;
2799                 goto failed;
2800         }
2801
2802         if (ver != msg->ibm_version) {
2803                 CERROR("%s replied version %x is different with requested version %x\n",
2804                        libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2805                 rc = -EPROTO;
2806                 goto failed;
2807         }
2808
2809         if (msg->ibm_u.connparams.ibcp_queue_depth >
2810             conn->ibc_queue_depth) {
2811                 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2812                        libcfs_nid2str(peer->ibp_nid),
2813                        msg->ibm_u.connparams.ibcp_queue_depth,
2814                        conn->ibc_queue_depth);
2815                 rc = -EPROTO;
2816                 goto failed;
2817         }
2818
2819         if (msg->ibm_u.connparams.ibcp_max_frags >
2820             conn->ibc_max_frags) {
2821                 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
2822                        libcfs_nid2str(peer->ibp_nid),
2823                        msg->ibm_u.connparams.ibcp_max_frags,
2824                        conn->ibc_max_frags);
2825                 rc = -EPROTO;
2826                 goto failed;
2827         }
2828
2829         if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2830                 CERROR("%s max message size %d too big (%d max)\n",
2831                        libcfs_nid2str(peer->ibp_nid),
2832                        msg->ibm_u.connparams.ibcp_max_msg_size,
2833                        IBLND_MSG_SIZE);
2834                 rc = -EPROTO;
2835                 goto failed;
2836         }
2837
2838         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2839         if (msg->ibm_dstnid == ni->ni_nid &&
2840             msg->ibm_dststamp == net->ibn_incarnation)
2841                 rc = 0;
2842         else
2843                 rc = -ESTALE;
2844         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2845
2846         if (rc) {
2847                 CERROR("Bad connection reply from %s, rc = %d, version: %x max_frags: %d\n",
2848                        libcfs_nid2str(peer->ibp_nid), rc,
2849                        msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2850                 goto failed;
2851         }
2852
2853         conn->ibc_incarnation = msg->ibm_srcstamp;
2854         conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2855         conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2856         conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2857         conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
2858         LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2859                 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
2860
2861         kiblnd_connreq_done(conn, 0);
2862         return;
2863
2864  failed:
2865         /*
2866          * NB My QP has already established itself, so I handle anything going
2867          * wrong here by setting ibc_comms_error.
2868          * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2869          * immediately tears it down.
2870          */
2871         LASSERT(rc);
2872         conn->ibc_comms_error = rc;
2873         kiblnd_connreq_done(conn, 0);
2874 }
2875
2876 static int
2877 kiblnd_active_connect(struct rdma_cm_id *cmid)
2878 {
2879         kib_peer_t *peer = (kib_peer_t *)cmid->context;
2880         kib_conn_t *conn;
2881         kib_msg_t *msg;
2882         struct rdma_conn_param cp;
2883         int version;
2884         __u64 incarnation;
2885         unsigned long flags;
2886         int rc;
2887
2888         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2889
2890         incarnation = peer->ibp_incarnation;
2891         version = !peer->ibp_version ? IBLND_MSG_VERSION :
2892                                        peer->ibp_version;
2893
2894         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2895
2896         conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT,
2897                                   version);
2898         if (!conn) {
2899                 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2900                 kiblnd_peer_decref(peer); /* lose cmid's ref */
2901                 return -ENOMEM;
2902         }
2903
2904         /*
2905          * conn "owns" cmid now, so I return success from here on to ensure the
2906          * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2907          * on peer
2908          */
2909         msg = &conn->ibc_connvars->cv_msg;
2910
2911         memset(msg, 0, sizeof(*msg));
2912         kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2913         msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2914         msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2915         msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2916
2917         kiblnd_pack_msg(peer->ibp_ni, msg, version,
2918                         0, peer->ibp_nid, incarnation);
2919
2920         memset(&cp, 0, sizeof(cp));
2921         cp.private_data = msg;
2922         cp.private_data_len    = msg->ibm_nob;
2923         cp.responder_resources = 0;          /* No atomic ops or RDMA reads */
2924         cp.initiator_depth     = 0;
2925         cp.flow_control        = 1;
2926         cp.retry_count         = *kiblnd_tunables.kib_retry_count;
2927         cp.rnr_retry_count     = *kiblnd_tunables.kib_rnr_retry_count;
2928
2929         LASSERT(cmid->context == (void *)conn);
2930         LASSERT(conn->ibc_cmid == cmid);
2931
2932         rc = rdma_connect(cmid, &cp);
2933         if (rc) {
2934                 CERROR("Can't connect to %s: %d\n",
2935                        libcfs_nid2str(peer->ibp_nid), rc);
2936                 kiblnd_connreq_done(conn, rc);
2937                 kiblnd_conn_decref(conn);
2938         }
2939
2940         return 0;
2941 }
2942
2943 int
2944 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2945 {
2946         kib_peer_t *peer;
2947         kib_conn_t *conn;
2948         int rc;
2949
2950         switch (event->event) {
2951         default:
2952                 CERROR("Unexpected event: %d, status: %d\n",
2953                        event->event, event->status);
2954                 LBUG();
2955
2956         case RDMA_CM_EVENT_CONNECT_REQUEST:
2957                 /* destroy cmid on failure */
2958                 rc = kiblnd_passive_connect(cmid,
2959                                             (void *)KIBLND_CONN_PARAM(event),
2960                                             KIBLND_CONN_PARAM_LEN(event));
2961                 CDEBUG(D_NET, "connreq: %d\n", rc);
2962                 return rc;
2963
2964         case RDMA_CM_EVENT_ADDR_ERROR:
2965                 peer = (kib_peer_t *)cmid->context;
2966                 CNETERR("%s: ADDR ERROR %d\n",
2967                         libcfs_nid2str(peer->ibp_nid), event->status);
2968                 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2969                 kiblnd_peer_decref(peer);
2970                 return -EHOSTUNREACH;      /* rc destroys cmid */
2971
2972         case RDMA_CM_EVENT_ADDR_RESOLVED:
2973                 peer = (kib_peer_t *)cmid->context;
2974
2975                 CDEBUG(D_NET, "%s Addr resolved: %d\n",
2976                        libcfs_nid2str(peer->ibp_nid), event->status);
2977
2978                 if (event->status) {
2979                         CNETERR("Can't resolve address for %s: %d\n",
2980                                 libcfs_nid2str(peer->ibp_nid), event->status);
2981                         rc = event->status;
2982                 } else {
2983                         rc = rdma_resolve_route(
2984                                 cmid, *kiblnd_tunables.kib_timeout * 1000);
2985                         if (!rc)
2986                                 return 0;
2987                         /* Can't initiate route resolution */
2988                         CERROR("Can't resolve route for %s: %d\n",
2989                                libcfs_nid2str(peer->ibp_nid), rc);
2990                 }
2991                 kiblnd_peer_connect_failed(peer, 1, rc);
2992                 kiblnd_peer_decref(peer);
2993                 return rc;                    /* rc destroys cmid */
2994
2995         case RDMA_CM_EVENT_ROUTE_ERROR:
2996                 peer = (kib_peer_t *)cmid->context;
2997                 CNETERR("%s: ROUTE ERROR %d\n",
2998                         libcfs_nid2str(peer->ibp_nid), event->status);
2999                 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
3000                 kiblnd_peer_decref(peer);
3001                 return -EHOSTUNREACH;      /* rc destroys cmid */
3002
3003         case RDMA_CM_EVENT_ROUTE_RESOLVED:
3004                 peer = (kib_peer_t *)cmid->context;
3005                 CDEBUG(D_NET, "%s Route resolved: %d\n",
3006                        libcfs_nid2str(peer->ibp_nid), event->status);
3007
3008                 if (!event->status)
3009                         return kiblnd_active_connect(cmid);
3010
3011                 CNETERR("Can't resolve route for %s: %d\n",
3012                         libcfs_nid2str(peer->ibp_nid), event->status);
3013                 kiblnd_peer_connect_failed(peer, 1, event->status);
3014                 kiblnd_peer_decref(peer);
3015                 return event->status;      /* rc destroys cmid */
3016
3017         case RDMA_CM_EVENT_UNREACHABLE:
3018                 conn = (kib_conn_t *)cmid->context;
3019                 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3020                         conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3021                 CNETERR("%s: UNREACHABLE %d\n",
3022                         libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3023                 kiblnd_connreq_done(conn, -ENETDOWN);
3024                 kiblnd_conn_decref(conn);
3025                 return 0;
3026
3027         case RDMA_CM_EVENT_CONNECT_ERROR:
3028                 conn = (kib_conn_t *)cmid->context;
3029                 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3030                         conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3031                 CNETERR("%s: CONNECT ERROR %d\n",
3032                         libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3033                 kiblnd_connreq_done(conn, -ENOTCONN);
3034                 kiblnd_conn_decref(conn);
3035                 return 0;
3036
3037         case RDMA_CM_EVENT_REJECTED:
3038                 conn = (kib_conn_t *)cmid->context;
3039                 switch (conn->ibc_state) {
3040                 default:
3041                         LBUG();
3042
3043                 case IBLND_CONN_PASSIVE_WAIT:
3044                         CERROR("%s: REJECTED %d\n",
3045                                libcfs_nid2str(conn->ibc_peer->ibp_nid),
3046                                event->status);
3047                         kiblnd_connreq_done(conn, -ECONNRESET);
3048                         break;
3049
3050                 case IBLND_CONN_ACTIVE_CONNECT:
3051                         kiblnd_rejected(conn, event->status,
3052                                         (void *)KIBLND_CONN_PARAM(event),
3053                                         KIBLND_CONN_PARAM_LEN(event));
3054                         break;
3055                 }
3056                 kiblnd_conn_decref(conn);
3057                 return 0;
3058
3059         case RDMA_CM_EVENT_ESTABLISHED:
3060                 conn = (kib_conn_t *)cmid->context;
3061                 switch (conn->ibc_state) {
3062                 default:
3063                         LBUG();
3064
3065                 case IBLND_CONN_PASSIVE_WAIT:
3066                         CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3067                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
3068                         kiblnd_connreq_done(conn, 0);
3069                         break;
3070
3071                 case IBLND_CONN_ACTIVE_CONNECT:
3072                         CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3073                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
3074                         kiblnd_check_connreply(conn,
3075                                                (void *)KIBLND_CONN_PARAM(event),
3076                                                KIBLND_CONN_PARAM_LEN(event));
3077                         break;
3078                 }
3079                 /* net keeps its ref on conn! */
3080                 return 0;
3081
3082         case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3083                 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3084                 return 0;
3085         case RDMA_CM_EVENT_DISCONNECTED:
3086                 conn = (kib_conn_t *)cmid->context;
3087                 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3088                         CERROR("%s DISCONNECTED\n",
3089                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
3090                         kiblnd_connreq_done(conn, -ECONNRESET);
3091                 } else {
3092                         kiblnd_close_conn(conn, 0);
3093                 }
3094                 kiblnd_conn_decref(conn);
3095                 cmid->context = NULL;
3096                 return 0;
3097
3098         case RDMA_CM_EVENT_DEVICE_REMOVAL:
3099                 LCONSOLE_ERROR_MSG(0x131,
3100                                    "Received notification of device removal\n"
3101                                    "Please shutdown LNET to allow this to proceed\n");
3102                 /*
3103                  * Can't remove network from underneath LNET for now, so I have
3104                  * to ignore this
3105                  */
3106                 return 0;
3107
3108         case RDMA_CM_EVENT_ADDR_CHANGE:
3109                 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3110                 return 0;
3111         }
3112 }
3113
3114 static int
3115 kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
3116 {
3117         kib_tx_t *tx;
3118         struct list_head *ttmp;
3119
3120         list_for_each(ttmp, txs) {
3121                 tx = list_entry(ttmp, kib_tx_t, tx_list);
3122
3123                 if (txs != &conn->ibc_active_txs) {
3124                         LASSERT(tx->tx_queued);
3125                 } else {
3126                         LASSERT(!tx->tx_queued);
3127                         LASSERT(tx->tx_waiting || tx->tx_sending);
3128                 }
3129
3130                 if (cfs_time_aftereq(jiffies, tx->tx_deadline)) {
3131                         CERROR("Timed out tx: %s, %lu seconds\n",
3132                                kiblnd_queue2str(conn, txs),
3133                                cfs_duration_sec(jiffies - tx->tx_deadline));
3134                         return 1;
3135                 }
3136         }
3137
3138         return 0;
3139 }
3140
3141 static int
3142 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3143 {
3144         return  kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3145                 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3146                 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3147                 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3148                 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3149 }
3150
3151 static void
3152 kiblnd_check_conns(int idx)
3153 {
3154         LIST_HEAD(closes);
3155         LIST_HEAD(checksends);
3156         struct list_head *peers = &kiblnd_data.kib_peers[idx];
3157         struct list_head *ptmp;
3158         kib_peer_t *peer;
3159         kib_conn_t *conn;
3160         kib_conn_t *temp;
3161         kib_conn_t *tmp;
3162         struct list_head *ctmp;
3163         unsigned long flags;
3164
3165         /*
3166          * NB. We expect to have a look at all the peers and not find any
3167          * RDMAs to time out, so we just use a shared lock while we
3168          * take a look...
3169          */
3170         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3171
3172         list_for_each(ptmp, peers) {
3173                 peer = list_entry(ptmp, kib_peer_t, ibp_list);
3174
3175                 list_for_each(ctmp, &peer->ibp_conns) {
3176                         int timedout;
3177                         int sendnoop;
3178
3179                         conn = list_entry(ctmp, kib_conn_t, ibc_list);
3180
3181                         LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3182
3183                         spin_lock(&conn->ibc_lock);
3184
3185                         sendnoop = kiblnd_need_noop(conn);
3186                         timedout = kiblnd_conn_timed_out_locked(conn);
3187                         if (!sendnoop && !timedout) {
3188                                 spin_unlock(&conn->ibc_lock);
3189                                 continue;
3190                         }
3191
3192                         if (timedout) {
3193                                 CERROR("Timed out RDMA with %s (%lu): c: %u, oc: %u, rc: %u\n",
3194                                        libcfs_nid2str(peer->ibp_nid),
3195                                        cfs_duration_sec(cfs_time_current() -
3196                                                         peer->ibp_last_alive),
3197                                        conn->ibc_credits,
3198                                        conn->ibc_outstanding_credits,
3199                                        conn->ibc_reserved_credits);
3200                                 list_add(&conn->ibc_connd_list, &closes);
3201                         } else {
3202                                 list_add(&conn->ibc_connd_list, &checksends);
3203                         }
3204                         /* +ref for 'closes' or 'checksends' */
3205                         kiblnd_conn_addref(conn);
3206
3207                         spin_unlock(&conn->ibc_lock);
3208                 }
3209         }
3210
3211         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3212
3213         /*
3214          * Handle timeout by closing the whole
3215          * connection. We can only be sure RDMA activity
3216          * has ceased once the QP has been modified.
3217          */
3218         list_for_each_entry_safe(conn, tmp, &closes, ibc_connd_list) {
3219                 list_del(&conn->ibc_connd_list);
3220                 kiblnd_close_conn(conn, -ETIMEDOUT);
3221                 kiblnd_conn_decref(conn);
3222         }
3223
3224         /*
3225          * In case we have enough credits to return via a
3226          * NOOP, but there were no non-blocking tx descs
3227          * free to do it last time...
3228          */
3229         list_for_each_entry_safe(conn, temp, &checksends, ibc_connd_list) {
3230                 list_del(&conn->ibc_connd_list);
3231                 kiblnd_check_sends(conn);
3232                 kiblnd_conn_decref(conn);
3233         }
3234 }
3235
3236 static void
3237 kiblnd_disconnect_conn(kib_conn_t *conn)
3238 {
3239         LASSERT(!in_interrupt());
3240         LASSERT(current == kiblnd_data.kib_connd);
3241         LASSERT(conn->ibc_state == IBLND_CONN_CLOSING);
3242
3243         rdma_disconnect(conn->ibc_cmid);
3244         kiblnd_finalise_conn(conn);
3245
3246         kiblnd_peer_notify(conn->ibc_peer);
3247 }
3248
3249 /**
3250  * High-water for reconnection to the same peer, reconnection attempt should
3251  * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3252  */
3253 #define KIB_RECONN_HIGH_RACE    10
3254 /**
3255  * Allow connd to take a break and handle other things after consecutive
3256  * reconnection attemps.
3257  */
3258 #define KIB_RECONN_BREAK        100
3259
3260 int
3261 kiblnd_connd(void *arg)
3262 {
3263         spinlock_t *lock= &kiblnd_data.kib_connd_lock;
3264         wait_queue_t wait;
3265         unsigned long flags;
3266         kib_conn_t *conn;
3267         int timeout;
3268         int i;
3269         int dropped_lock;
3270         int peer_index = 0;
3271         unsigned long deadline = jiffies;
3272
3273         cfs_block_allsigs();
3274
3275         init_waitqueue_entry(&wait, current);
3276         kiblnd_data.kib_connd = current;
3277
3278         spin_lock_irqsave(lock, flags);
3279
3280         while (!kiblnd_data.kib_shutdown) {
3281                 int reconn = 0;
3282
3283                 dropped_lock = 0;
3284
3285                 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3286                         kib_peer_t *peer = NULL;
3287
3288                         conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3289                                           kib_conn_t, ibc_list);
3290                         list_del(&conn->ibc_list);
3291                         if (conn->ibc_reconnect) {
3292                                 peer = conn->ibc_peer;
3293                                 kiblnd_peer_addref(peer);
3294                         }
3295
3296                         spin_unlock_irqrestore(lock, flags);
3297                         dropped_lock = 1;
3298
3299                         kiblnd_destroy_conn(conn, !peer);
3300
3301                         spin_lock_irqsave(lock, flags);
3302                         if (!peer)
3303                                 continue;
3304
3305                         conn->ibc_peer = peer;
3306                         if (peer->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3307                                 list_add_tail(&conn->ibc_list,
3308                                               &kiblnd_data.kib_reconn_list);
3309                         else
3310                                 list_add_tail(&conn->ibc_list,
3311                                               &kiblnd_data.kib_reconn_wait);
3312                 }
3313
3314                 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3315                         conn = list_entry(kiblnd_data.kib_connd_conns.next,
3316                                           kib_conn_t, ibc_list);
3317                         list_del(&conn->ibc_list);
3318
3319                         spin_unlock_irqrestore(lock, flags);
3320                         dropped_lock = 1;
3321
3322                         kiblnd_disconnect_conn(conn);
3323                         kiblnd_conn_decref(conn);
3324
3325                         spin_lock_irqsave(lock, flags);
3326                 }
3327
3328                 while (reconn < KIB_RECONN_BREAK) {
3329                         if (kiblnd_data.kib_reconn_sec !=
3330                             ktime_get_real_seconds()) {
3331                                 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3332                                 list_splice_init(&kiblnd_data.kib_reconn_wait,
3333                                                  &kiblnd_data.kib_reconn_list);
3334                         }
3335
3336                         if (list_empty(&kiblnd_data.kib_reconn_list))
3337                                 break;
3338
3339                         conn = list_entry(kiblnd_data.kib_reconn_list.next,
3340                                           kib_conn_t, ibc_list);
3341                         list_del(&conn->ibc_list);
3342
3343                         spin_unlock_irqrestore(lock, flags);
3344                         dropped_lock = 1;
3345
3346                         reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3347                         kiblnd_peer_decref(conn->ibc_peer);
3348                         LIBCFS_FREE(conn, sizeof(*conn));
3349
3350                         spin_lock_irqsave(lock, flags);
3351                 }
3352
3353                 /* careful with the jiffy wrap... */
3354                 timeout = (int)(deadline - jiffies);
3355                 if (timeout <= 0) {
3356                         const int n = 4;
3357                         const int p = 1;
3358                         int chunk = kiblnd_data.kib_peer_hash_size;
3359
3360                         spin_unlock_irqrestore(lock, flags);
3361                         dropped_lock = 1;
3362
3363                         /*
3364                          * Time to check for RDMA timeouts on a few more
3365                          * peers: I do checks every 'p' seconds on a
3366                          * proportion of the peer table and I need to check
3367                          * every connection 'n' times within a timeout
3368                          * interval, to ensure I detect a timeout on any
3369                          * connection within (n+1)/n times the timeout
3370                          * interval.
3371                          */
3372                         if (*kiblnd_tunables.kib_timeout > n * p)
3373                                 chunk = (chunk * n * p) /
3374                                         *kiblnd_tunables.kib_timeout;
3375                         if (!chunk)
3376                                 chunk = 1;
3377
3378                         for (i = 0; i < chunk; i++) {
3379                                 kiblnd_check_conns(peer_index);
3380                                 peer_index = (peer_index + 1) %
3381                                              kiblnd_data.kib_peer_hash_size;
3382                         }
3383
3384                         deadline += msecs_to_jiffies(p * MSEC_PER_SEC);
3385                         spin_lock_irqsave(lock, flags);
3386                 }
3387
3388                 if (dropped_lock)
3389                         continue;
3390
3391                 /* Nothing to do for 'timeout'  */
3392                 set_current_state(TASK_INTERRUPTIBLE);
3393                 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3394                 spin_unlock_irqrestore(lock, flags);
3395
3396                 schedule_timeout(timeout);
3397
3398                 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3399                 spin_lock_irqsave(lock, flags);
3400         }
3401
3402         spin_unlock_irqrestore(lock, flags);
3403
3404         kiblnd_thread_fini();
3405         return 0;
3406 }
3407
3408 void
3409 kiblnd_qp_event(struct ib_event *event, void *arg)
3410 {
3411         kib_conn_t *conn = arg;
3412
3413         switch (event->event) {
3414         case IB_EVENT_COMM_EST:
3415                 CDEBUG(D_NET, "%s established\n",
3416                        libcfs_nid2str(conn->ibc_peer->ibp_nid));
3417                 return;
3418
3419         default:
3420                 CERROR("%s: Async QP event type %d\n",
3421                        libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3422                 return;
3423         }
3424 }
3425
3426 static void
3427 kiblnd_complete(struct ib_wc *wc)
3428 {
3429         switch (kiblnd_wreqid2type(wc->wr_id)) {
3430         default:
3431                 LBUG();
3432
3433         case IBLND_WID_MR:
3434                 if (wc->status != IB_WC_SUCCESS &&
3435                     wc->status != IB_WC_WR_FLUSH_ERR)
3436                         CNETERR("FastReg failed: %d\n", wc->status);
3437                 break;
3438
3439         case IBLND_WID_RDMA:
3440                 /*
3441                  * We only get RDMA completion notification if it fails.  All
3442                  * subsequent work items, including the final SEND will fail
3443                  * too.  However we can't print out any more info about the
3444                  * failing RDMA because 'tx' might be back on the idle list or
3445                  * even reused already if we didn't manage to post all our work
3446                  * items
3447                  */
3448                 CNETERR("RDMA (tx: %p) failed: %d\n",
3449                         kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3450                 return;
3451
3452         case IBLND_WID_TX:
3453                 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3454                 return;
3455
3456         case IBLND_WID_RX:
3457                 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3458                                    wc->byte_len);
3459                 return;
3460         }
3461 }
3462
3463 void
3464 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3465 {
3466         /*
3467          * NB I'm not allowed to schedule this conn once its refcount has
3468          * reached 0.  Since fundamentally I'm racing with scheduler threads
3469          * consuming my CQ I could be called after all completions have
3470          * occurred.  But in this case, !ibc_nrx && !ibc_nsends_posted
3471          * and this CQ is about to be destroyed so I NOOP.
3472          */
3473         kib_conn_t *conn = arg;
3474         struct kib_sched_info *sched = conn->ibc_sched;
3475         unsigned long flags;
3476
3477         LASSERT(cq == conn->ibc_cq);
3478
3479         spin_lock_irqsave(&sched->ibs_lock, flags);
3480
3481         conn->ibc_ready = 1;
3482
3483         if (!conn->ibc_scheduled &&
3484             (conn->ibc_nrx > 0 ||
3485              conn->ibc_nsends_posted > 0)) {
3486                 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3487                 conn->ibc_scheduled = 1;
3488                 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3489
3490                 if (waitqueue_active(&sched->ibs_waitq))
3491                         wake_up(&sched->ibs_waitq);
3492         }
3493
3494         spin_unlock_irqrestore(&sched->ibs_lock, flags);
3495 }
3496
3497 void
3498 kiblnd_cq_event(struct ib_event *event, void *arg)
3499 {
3500         kib_conn_t *conn = arg;
3501
3502         CERROR("%s: async CQ event type %d\n",
3503                libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3504 }
3505
3506 int
3507 kiblnd_scheduler(void *arg)
3508 {
3509         long id = (long)arg;
3510         struct kib_sched_info *sched;
3511         kib_conn_t *conn;
3512         wait_queue_t wait;
3513         unsigned long flags;
3514         struct ib_wc wc;
3515         int did_something;
3516         int busy_loops = 0;
3517         int rc;
3518
3519         cfs_block_allsigs();
3520
3521         init_waitqueue_entry(&wait, current);
3522
3523         sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3524
3525         rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3526         if (rc) {
3527                 CWARN("Failed to bind on CPT %d, please verify whether all CPUs are healthy and reload modules if necessary, otherwise your system might under risk of low performance\n",
3528                       sched->ibs_cpt);
3529         }
3530
3531         spin_lock_irqsave(&sched->ibs_lock, flags);
3532
3533         while (!kiblnd_data.kib_shutdown) {
3534                 if (busy_loops++ >= IBLND_RESCHED) {
3535                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
3536
3537                         cond_resched();
3538                         busy_loops = 0;
3539
3540                         spin_lock_irqsave(&sched->ibs_lock, flags);
3541                 }
3542
3543                 did_something = 0;
3544
3545                 if (!list_empty(&sched->ibs_conns)) {
3546                         conn = list_entry(sched->ibs_conns.next, kib_conn_t,
3547                                           ibc_sched_list);
3548                         /* take over kib_sched_conns' ref on conn... */
3549                         LASSERT(conn->ibc_scheduled);
3550                         list_del(&conn->ibc_sched_list);
3551                         conn->ibc_ready = 0;
3552
3553                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
3554
3555                         wc.wr_id = IBLND_WID_INVAL;
3556
3557                         rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3558                         if (!rc) {
3559                                 rc = ib_req_notify_cq(conn->ibc_cq,
3560                                                       IB_CQ_NEXT_COMP);
3561                                 if (rc < 0) {
3562                                         CWARN("%s: ib_req_notify_cq failed: %d, closing connection\n",
3563                                               libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3564                                         kiblnd_close_conn(conn, -EIO);
3565                                         kiblnd_conn_decref(conn);
3566                                         spin_lock_irqsave(&sched->ibs_lock,
3567                                                           flags);
3568                                         continue;
3569                                 }
3570
3571                                 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3572                         }
3573
3574                         if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3575                                 LCONSOLE_ERROR("ib_poll_cq (rc: %d) returned invalid wr_id, opcode %d, status: %d, vendor_err: %d, conn: %s status: %d\nplease upgrade firmware and OFED or contact vendor.\n",
3576                                                rc, wc.opcode, wc.status,
3577                                                wc.vendor_err,
3578                                                libcfs_nid2str(conn->ibc_peer->ibp_nid),
3579                                                conn->ibc_state);
3580                                 rc = -EINVAL;
3581                         }
3582
3583                         if (rc < 0) {
3584                                 CWARN("%s: ib_poll_cq failed: %d, closing connection\n",
3585                                       libcfs_nid2str(conn->ibc_peer->ibp_nid),
3586                                       rc);
3587                                 kiblnd_close_conn(conn, -EIO);
3588                                 kiblnd_conn_decref(conn);
3589                                 spin_lock_irqsave(&sched->ibs_lock, flags);
3590                                 continue;
3591                         }
3592
3593                         spin_lock_irqsave(&sched->ibs_lock, flags);
3594
3595                         if (rc || conn->ibc_ready) {
3596                                 /*
3597                                  * There may be another completion waiting; get
3598                                  * another scheduler to check while I handle
3599                                  * this one...
3600                                  */
3601                                 /* +1 ref for sched_conns */
3602                                 kiblnd_conn_addref(conn);
3603                                 list_add_tail(&conn->ibc_sched_list,
3604                                               &sched->ibs_conns);
3605                                 if (waitqueue_active(&sched->ibs_waitq))
3606                                         wake_up(&sched->ibs_waitq);
3607                         } else {
3608                                 conn->ibc_scheduled = 0;
3609                         }
3610
3611                         if (rc) {
3612                                 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3613                                 kiblnd_complete(&wc);
3614
3615                                 spin_lock_irqsave(&sched->ibs_lock, flags);
3616                         }
3617
3618                         kiblnd_conn_decref(conn); /* ...drop my ref from above */
3619                         did_something = 1;
3620                 }
3621
3622                 if (did_something)
3623                         continue;
3624
3625                 set_current_state(TASK_INTERRUPTIBLE);
3626                 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3627                 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3628
3629                 schedule();
3630                 busy_loops = 0;
3631
3632                 remove_wait_queue(&sched->ibs_waitq, &wait);
3633                 spin_lock_irqsave(&sched->ibs_lock, flags);
3634         }
3635
3636         spin_unlock_irqrestore(&sched->ibs_lock, flags);
3637
3638         kiblnd_thread_fini();
3639         return 0;
3640 }
3641
3642 int
3643 kiblnd_failover_thread(void *arg)
3644 {
3645         rwlock_t *glock = &kiblnd_data.kib_global_lock;
3646         kib_dev_t *dev;
3647         wait_queue_t wait;
3648         unsigned long flags;
3649         int rc;
3650
3651         LASSERT(*kiblnd_tunables.kib_dev_failover);
3652
3653         cfs_block_allsigs();
3654
3655         init_waitqueue_entry(&wait, current);
3656         write_lock_irqsave(glock, flags);
3657
3658         while (!kiblnd_data.kib_shutdown) {
3659                 int do_failover = 0;
3660                 int long_sleep;
3661
3662                 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3663                                     ibd_fail_list) {
3664                         if (time_before(cfs_time_current(),
3665                                         dev->ibd_next_failover))
3666                                 continue;
3667                         do_failover = 1;
3668                         break;
3669                 }
3670
3671                 if (do_failover) {
3672                         list_del_init(&dev->ibd_fail_list);
3673                         dev->ibd_failover = 1;
3674                         write_unlock_irqrestore(glock, flags);
3675
3676                         rc = kiblnd_dev_failover(dev);
3677
3678                         write_lock_irqsave(glock, flags);
3679
3680                         LASSERT(dev->ibd_failover);
3681                         dev->ibd_failover = 0;
3682                         if (rc >= 0) { /* Device is OK or failover succeed */
3683                                 dev->ibd_next_failover = cfs_time_shift(3);
3684                                 continue;
3685                         }
3686
3687                         /* failed to failover, retry later */
3688                         dev->ibd_next_failover =
3689                                 cfs_time_shift(min(dev->ibd_failed_failover, 10));
3690                         if (kiblnd_dev_can_failover(dev)) {
3691                                 list_add_tail(&dev->ibd_fail_list,
3692                                               &kiblnd_data.kib_failed_devs);
3693                         }
3694
3695                         continue;
3696                 }
3697
3698                 /* long sleep if no more pending failover */
3699                 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3700
3701                 set_current_state(TASK_INTERRUPTIBLE);
3702                 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3703                 write_unlock_irqrestore(glock, flags);
3704
3705                 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3706                                                    cfs_time_seconds(1));
3707                 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3708                 write_lock_irqsave(glock, flags);
3709
3710                 if (!long_sleep || rc)
3711                         continue;
3712
3713                 /*
3714                  * have a long sleep, routine check all active devices,
3715                  * we need checking like this because if there is not active
3716                  * connection on the dev and no SEND from local, we may listen
3717                  * on wrong HCA for ever while there is a bonding failover
3718                  */
3719                 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3720                         if (kiblnd_dev_can_failover(dev)) {
3721                                 list_add_tail(&dev->ibd_fail_list,
3722                                               &kiblnd_data.kib_failed_devs);
3723                         }
3724                 }
3725         }
3726
3727         write_unlock_irqrestore(glock, flags);
3728
3729         kiblnd_thread_fini();
3730         return 0;
3731 }