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, 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
  44 kiblnd_tx_done(lnet_ni_t *ni, kib_tx_t *tx)
  45 {
  46         lnet_msg_t *lntmsg[2];
  47         kib_net_t *net = ni->ni_data;
  48         int rc;
  49         int i;
  50
  51         LASSERT(net != NULL);
  52         LASSERT(!in_interrupt());
  53         LASSERT(!tx->tx_queued);               /* mustn't be queued for sending */
  54         LASSERT(tx->tx_sending == 0);     /* mustn't be awaiting sent callback */
  55         LASSERT(!tx->tx_waiting);             /* mustn't be awaiting peer response */
  56         LASSERT(tx->tx_pool != NULL);
  57
  58         kiblnd_unmap_tx(ni, tx);
  59
  60         /* tx may have up to 2 lnet msgs to finalise */
  61         lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
  62         lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
  63         rc = tx->tx_status;
  64
  65         if (tx->tx_conn != NULL) {
  66                 LASSERT(ni == tx->tx_conn->ibc_peer->ibp_ni);
  67
  68                 kiblnd_conn_decref(tx->tx_conn);
  69                 tx->tx_conn = NULL;
  70         }
  71
  72         tx->tx_nwrq = 0;
  73         tx->tx_status = 0;
  74
  75         kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
  76
  77         /* delay finalize until my descs have been freed */
  78         for (i = 0; i < 2; i++) {
  79                 if (lntmsg[i] == NULL)
  80                         continue;
  81
  82                 lnet_finalize(ni, lntmsg[i], rc);
  83         }
  84 }
  85
  86 void
  87 kiblnd_txlist_done(lnet_ni_t *ni, struct list_head *txlist, int status)
  88 {
  89         kib_tx_t *tx;
  90
  91         while (!list_empty(txlist)) {
  92                 tx = list_entry(txlist->next, kib_tx_t, tx_list);
  93
  94                 list_del(&tx->tx_list);
  95                 /* complete now */
  96                 tx->tx_waiting = 0;
  97                 tx->tx_status = status;
  98                 kiblnd_tx_done(ni, tx);
  99         }
 100 }
 101
 102 static kib_tx_t *
 103 kiblnd_get_idle_tx(lnet_ni_t *ni, lnet_nid_t target)
 104 {
 105         kib_net_t *net = (kib_net_t *)ni->ni_data;
 106         struct list_head *node;
 107         kib_tx_t *tx;
 108         kib_tx_poolset_t *tps;
 109
 110         tps = net->ibn_tx_ps[lnet_cpt_of_nid(target)];
 111         node = kiblnd_pool_alloc_node(&tps->tps_poolset);
 112         if (node == NULL)
 113                 return NULL;
 114         tx = container_of(node, kib_tx_t, tx_list);
 115
 116         LASSERT(tx->tx_nwrq == 0);
 117         LASSERT(!tx->tx_queued);
 118         LASSERT(tx->tx_sending == 0);
 119         LASSERT(!tx->tx_waiting);
 120         LASSERT(tx->tx_status == 0);
 121         LASSERT(tx->tx_conn == NULL);
 122         LASSERT(tx->tx_lntmsg[0] == NULL);
 123         LASSERT(tx->tx_lntmsg[1] == NULL);
 124         LASSERT(tx->tx_nfrags == 0);
 125
 126         return tx;
 127 }
 128
 129 static void
 130 kiblnd_drop_rx(kib_rx_t *rx)
 131 {
 132         kib_conn_t *conn = rx->rx_conn;
 133         struct kib_sched_info *sched = conn->ibc_sched;
 134         unsigned long flags;
 135
 136         spin_lock_irqsave(&sched->ibs_lock, flags);
 137         LASSERT(conn->ibc_nrx > 0);
 138         conn->ibc_nrx--;
 139         spin_unlock_irqrestore(&sched->ibs_lock, flags);
 140
 141         kiblnd_conn_decref(conn);
 142 }
 143
 144 int
 145 kiblnd_post_rx(kib_rx_t *rx, int credit)
 146 {
 147         kib_conn_t *conn = rx->rx_conn;
 148         kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
 149         struct ib_recv_wr *bad_wrq = NULL;
 150         struct ib_mr *mr;
 151         int rc;
 152
 153         LASSERT(net != NULL);
 154         LASSERT(!in_interrupt());
 155         LASSERT(credit == IBLND_POSTRX_NO_CREDIT ||
 156                 credit == IBLND_POSTRX_PEER_CREDIT ||
 157                 credit == IBLND_POSTRX_RSRVD_CREDIT);
 158
 159         mr = kiblnd_find_dma_mr(conn->ibc_hdev, rx->rx_msgaddr, IBLND_MSG_SIZE);
 160         LASSERT(mr != NULL);
 161
 162         rx->rx_sge.lkey   = mr->lkey;
 163         rx->rx_sge.addr   = rx->rx_msgaddr;
 164         rx->rx_sge.length = IBLND_MSG_SIZE;
 165
 166         rx->rx_wrq.next    = NULL;
 167         rx->rx_wrq.sg_list = &rx->rx_sge;
 168         rx->rx_wrq.num_sge = 1;
 169         rx->rx_wrq.wr_id   = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
 170
 171         LASSERT(conn->ibc_state >= IBLND_CONN_INIT);
 172         LASSERT(rx->rx_nob >= 0);             /* not posted */
 173
 174         if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
 175                 kiblnd_drop_rx(rx);          /* No more posts for this rx */
 176                 return 0;
 177         }
 178
 179         rx->rx_nob = -1;                        /* flag posted */
 180
 181         rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
 182         if (rc != 0) {
 183                 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
 184                        libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
 185                 rx->rx_nob = 0;
 186         }
 187
 188         if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
 189                 return rc;
 190
 191         if (rc != 0) {
 192                 kiblnd_close_conn(conn, rc);
 193                 kiblnd_drop_rx(rx);          /* No more posts for this rx */
 194                 return rc;
 195         }
 196
 197         if (credit == IBLND_POSTRX_NO_CREDIT)
 198                 return 0;
 199
 200         spin_lock(&conn->ibc_lock);
 201         if (credit == IBLND_POSTRX_PEER_CREDIT)
 202                 conn->ibc_outstanding_credits++;
 203         else
 204                 conn->ibc_reserved_credits++;
 205         spin_unlock(&conn->ibc_lock);
 206
 207         kiblnd_check_sends(conn);
 208         return 0;
 209 }
 210
 211 static kib_tx_t *
 212 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
 213 {
 214         struct list_head *tmp;
 215
 216         list_for_each(tmp, &conn->ibc_active_txs) {
 217                 kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
 218
 219                 LASSERT(!tx->tx_queued);
 220                 LASSERT(tx->tx_sending != 0 || tx->tx_waiting);
 221
 222                 if (tx->tx_cookie != cookie)
 223                         continue;
 224
 225                 if (tx->tx_waiting &&
 226                     tx->tx_msg->ibm_type == txtype)
 227                         return tx;
 228
 229                 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
 230                       tx->tx_waiting ? "" : "NOT ",
 231                       tx->tx_msg->ibm_type, txtype);
 232         }
 233         return NULL;
 234 }
 235
 236 static void
 237 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
 238 {
 239         kib_tx_t *tx;
 240         lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
 241         int idle;
 242
 243         spin_lock(&conn->ibc_lock);
 244
 245         tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
 246         if (tx == NULL) {
 247                 spin_unlock(&conn->ibc_lock);
 248
 249                 CWARN("Unmatched completion type %x cookie %#llx from %s\n",
 250                       txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 251                 kiblnd_close_conn(conn, -EPROTO);
 252                 return;
 253         }
 254
 255         if (tx->tx_status == 0) {              /* success so far */
 256                 if (status < 0) {              /* failed? */
 257                         tx->tx_status = status;
 258                 } else if (txtype == IBLND_MSG_GET_REQ) {
 259                         lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
 260                 }
 261         }
 262
 263         tx->tx_waiting = 0;
 264
 265         idle = !tx->tx_queued && (tx->tx_sending == 0);
 266         if (idle)
 267                 list_del(&tx->tx_list);
 268
 269         spin_unlock(&conn->ibc_lock);
 270
 271         if (idle)
 272                 kiblnd_tx_done(ni, tx);
 273 }
 274
 275 static void
 276 kiblnd_send_completion(kib_conn_t *conn, int type, int status, __u64 cookie)
 277 {
 278         lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
 279         kib_tx_t *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
 280
 281         if (tx == NULL) {
 282                 CERROR("Can't get tx for completion %x for %s\n",
 283                        type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 284                 return;
 285         }
 286
 287         tx->tx_msg->ibm_u.completion.ibcm_status = status;
 288         tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
 289         kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
 290
 291         kiblnd_queue_tx(tx, conn);
 292 }
 293
 294 static void
 295 kiblnd_handle_rx(kib_rx_t *rx)
 296 {
 297         kib_msg_t *msg = rx->rx_msg;
 298         kib_conn_t *conn = rx->rx_conn;
 299         lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
 300         int credits = msg->ibm_credits;
 301         kib_tx_t *tx;
 302         int rc = 0;
 303         int rc2;
 304         int post_credit;
 305
 306         LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
 307
 308         CDEBUG(D_NET, "Received %x[%d] from %s\n",
 309                msg->ibm_type, credits,
 310                libcfs_nid2str(conn->ibc_peer->ibp_nid));
 311
 312         if (credits != 0) {
 313                 /* Have I received credits that will let me send? */
 314                 spin_lock(&conn->ibc_lock);
 315
 316                 if (conn->ibc_credits + credits >
 317                     IBLND_MSG_QUEUE_SIZE(conn->ibc_version)) {
 318                         rc2 = conn->ibc_credits;
 319                         spin_unlock(&conn->ibc_lock);
 320
 321                         CERROR("Bad credits from %s: %d + %d > %d\n",
 322                                libcfs_nid2str(conn->ibc_peer->ibp_nid),
 323                                rc2, credits,
 324                                IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
 325
 326                         kiblnd_close_conn(conn, -EPROTO);
 327                         kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
 328                         return;
 329                 }
 330
 331                 conn->ibc_credits += credits;
 332
 333                 /* This ensures the credit taken by NOOP can be returned */
 334                 if (msg->ibm_type == IBLND_MSG_NOOP &&
 335                     !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
 336                         conn->ibc_outstanding_credits++;
 337
 338                 spin_unlock(&conn->ibc_lock);
 339                 kiblnd_check_sends(conn);
 340         }
 341
 342         switch (msg->ibm_type) {
 343         default:
 344                 CERROR("Bad IBLND message type %x from %s\n",
 345                        msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 346                 post_credit = IBLND_POSTRX_NO_CREDIT;
 347                 rc = -EPROTO;
 348                 break;
 349
 350         case IBLND_MSG_NOOP:
 351                 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
 352                         post_credit = IBLND_POSTRX_NO_CREDIT;
 353                         break;
 354                 }
 355
 356                 if (credits != 0) /* credit already posted */
 357                         post_credit = IBLND_POSTRX_NO_CREDIT;
 358                 else          /* a keepalive NOOP */
 359                         post_credit = IBLND_POSTRX_PEER_CREDIT;
 360                 break;
 361
 362         case IBLND_MSG_IMMEDIATE:
 363                 post_credit = IBLND_POSTRX_DONT_POST;
 364                 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
 365                                 msg->ibm_srcnid, rx, 0);
 366                 if (rc < 0)                  /* repost on error */
 367                         post_credit = IBLND_POSTRX_PEER_CREDIT;
 368                 break;
 369
 370         case IBLND_MSG_PUT_REQ:
 371                 post_credit = IBLND_POSTRX_DONT_POST;
 372                 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
 373                                 msg->ibm_srcnid, rx, 1);
 374                 if (rc < 0)                  /* repost on error */
 375                         post_credit = IBLND_POSTRX_PEER_CREDIT;
 376                 break;
 377
 378         case IBLND_MSG_PUT_NAK:
 379                 CWARN("PUT_NACK from %s\n",
 380                       libcfs_nid2str(conn->ibc_peer->ibp_nid));
 381                 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
 382                 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
 383                                          msg->ibm_u.completion.ibcm_status,
 384                                          msg->ibm_u.completion.ibcm_cookie);
 385                 break;
 386
 387         case IBLND_MSG_PUT_ACK:
 388                 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
 389
 390                 spin_lock(&conn->ibc_lock);
 391                 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
 392                                         msg->ibm_u.putack.ibpam_src_cookie);
 393                 if (tx != NULL)
 394                         list_del(&tx->tx_list);
 395                 spin_unlock(&conn->ibc_lock);
 396
 397                 if (tx == NULL) {
 398                         CERROR("Unmatched PUT_ACK from %s\n",
 399                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
 400                         rc = -EPROTO;
 401                         break;
 402                 }
 403
 404                 LASSERT(tx->tx_waiting);
 405                 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
 406                  * (a) I can overwrite tx_msg since my peer has received it!
 407                  * (b) tx_waiting set tells tx_complete() it's not done. */
 408
 409                 tx->tx_nwrq = 0;                /* overwrite PUT_REQ */
 410
 411                 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
 412                                        kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
 413                                        &msg->ibm_u.putack.ibpam_rd,
 414                                        msg->ibm_u.putack.ibpam_dst_cookie);
 415                 if (rc2 < 0)
 416                         CERROR("Can't setup rdma for PUT to %s: %d\n",
 417                                libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
 418
 419                 spin_lock(&conn->ibc_lock);
 420                 tx->tx_waiting = 0;     /* clear waiting and queue atomically */
 421                 kiblnd_queue_tx_locked(tx, conn);
 422                 spin_unlock(&conn->ibc_lock);
 423                 break;
 424
 425         case IBLND_MSG_PUT_DONE:
 426                 post_credit = IBLND_POSTRX_PEER_CREDIT;
 427                 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
 428                                          msg->ibm_u.completion.ibcm_status,
 429                                          msg->ibm_u.completion.ibcm_cookie);
 430                 break;
 431
 432         case IBLND_MSG_GET_REQ:
 433                 post_credit = IBLND_POSTRX_DONT_POST;
 434                 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
 435                                 msg->ibm_srcnid, rx, 1);
 436                 if (rc < 0)                  /* repost on error */
 437                         post_credit = IBLND_POSTRX_PEER_CREDIT;
 438                 break;
 439
 440         case IBLND_MSG_GET_DONE:
 441                 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
 442                 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
 443                                          msg->ibm_u.completion.ibcm_status,
 444                                          msg->ibm_u.completion.ibcm_cookie);
 445                 break;
 446         }
 447
 448         if (rc < 0)                          /* protocol error */
 449                 kiblnd_close_conn(conn, rc);
 450
 451         if (post_credit != IBLND_POSTRX_DONT_POST)
 452                 kiblnd_post_rx(rx, post_credit);
 453 }
 454
 455 static void
 456 kiblnd_rx_complete(kib_rx_t *rx, int status, int nob)
 457 {
 458         kib_msg_t *msg = rx->rx_msg;
 459         kib_conn_t *conn = rx->rx_conn;
 460         lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
 461         kib_net_t *net = ni->ni_data;
 462         int rc;
 463         int err = -EIO;
 464
 465         LASSERT(net != NULL);
 466         LASSERT(rx->rx_nob < 0);               /* was posted */
 467         rx->rx_nob = 0;                  /* isn't now */
 468
 469         if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
 470                 goto ignore;
 471
 472         if (status != IB_WC_SUCCESS) {
 473                 CNETERR("Rx from %s failed: %d\n",
 474                         libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
 475                 goto failed;
 476         }
 477
 478         LASSERT(nob >= 0);
 479         rx->rx_nob = nob;
 480
 481         rc = kiblnd_unpack_msg(msg, rx->rx_nob);
 482         if (rc != 0) {
 483                 CERROR("Error %d unpacking rx from %s\n",
 484                         rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 485                 goto failed;
 486         }
 487
 488         if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
 489             msg->ibm_dstnid != ni->ni_nid ||
 490             msg->ibm_srcstamp != conn->ibc_incarnation ||
 491             msg->ibm_dststamp != net->ibn_incarnation) {
 492                 CERROR("Stale rx from %s\n",
 493                         libcfs_nid2str(conn->ibc_peer->ibp_nid));
 494                 err = -ESTALE;
 495                 goto failed;
 496         }
 497
 498         /* set time last known alive */
 499         kiblnd_peer_alive(conn->ibc_peer);
 500
 501         /* racing with connection establishment/teardown! */
 502
 503         if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
 504                 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
 505                 unsigned long flags;
 506
 507                 write_lock_irqsave(g_lock, flags);
 508                 /* must check holding global lock to eliminate race */
 509                 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
 510                         list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
 511                         write_unlock_irqrestore(g_lock, flags);
 512                         return;
 513                 }
 514                 write_unlock_irqrestore(g_lock, flags);
 515         }
 516         kiblnd_handle_rx(rx);
 517         return;
 518
 519  failed:
 520         CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
 521         kiblnd_close_conn(conn, err);
 522  ignore:
 523         kiblnd_drop_rx(rx);                  /* Don't re-post rx. */
 524 }
 525
 526 static struct page *
 527 kiblnd_kvaddr_to_page(unsigned long vaddr)
 528 {
 529         struct page *page;
 530
 531         if (is_vmalloc_addr((void *)vaddr)) {
 532                 page = vmalloc_to_page((void *)vaddr);
 533                 LASSERT(page != NULL);
 534                 return page;
 535         }
 536 #ifdef CONFIG_HIGHMEM
 537         if (vaddr >= PKMAP_BASE &&
 538             vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
 539                 /* No highmem pages only used for bulk (kiov) I/O */
 540                 CERROR("find page for address in highmem\n");
 541                 LBUG();
 542         }
 543 #endif
 544         page = virt_to_page(vaddr);
 545         LASSERT(page != NULL);
 546         return page;
 547 }
 548
 549 static int
 550 kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
 551 {
 552         kib_hca_dev_t *hdev;
 553         __u64 *pages = tx->tx_pages;
 554         kib_fmr_poolset_t *fps;
 555         int npages;
 556         int size;
 557         int cpt;
 558         int rc;
 559         int i;
 560
 561         LASSERT(tx->tx_pool != NULL);
 562         LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
 563
 564         hdev = tx->tx_pool->tpo_hdev;
 565
 566         for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
 567                 for (size = 0; size <  rd->rd_frags[i].rf_nob;
 568                                size += hdev->ibh_page_size) {
 569                         pages[npages++] = (rd->rd_frags[i].rf_addr &
 570                                             hdev->ibh_page_mask) + size;
 571                 }
 572         }
 573
 574         cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
 575
 576         fps = net->ibn_fmr_ps[cpt];
 577         rc = kiblnd_fmr_pool_map(fps, pages, npages, 0, &tx->fmr);
 578         if (rc != 0) {
 579                 CERROR("Can't map %d pages: %d\n", npages, rc);
 580                 return rc;
 581         }
 582
 583         /* If rd is not tx_rd, it's going to get sent to a peer, who will need
 584          * the rkey */
 585         rd->rd_key = (rd != tx->tx_rd) ? tx->fmr.fmr_pfmr->fmr->rkey :
 586                                          tx->fmr.fmr_pfmr->fmr->lkey;
 587         rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
 588         rd->rd_frags[0].rf_nob = nob;
 589         rd->rd_nfrags = 1;
 590
 591         return 0;
 592 }
 593
 594 void
 595 kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
 596 {
 597         kib_net_t *net = ni->ni_data;
 598
 599         LASSERT(net != NULL);
 600
 601         if (net->ibn_fmr_ps && tx->fmr.fmr_pfmr) {
 602                 kiblnd_fmr_pool_unmap(&tx->fmr, tx->tx_status);
 603                 tx->fmr.fmr_pfmr = NULL;
 604         }
 605
 606         if (tx->tx_nfrags != 0) {
 607                 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
 608                                     tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
 609                 tx->tx_nfrags = 0;
 610         }
 611 }
 612
 613 int
 614 kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx,
 615               kib_rdma_desc_t *rd, int nfrags)
 616 {
 617         kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
 618         kib_net_t *net = ni->ni_data;
 619         struct ib_mr *mr    = NULL;
 620         __u32 nob;
 621         int i;
 622
 623         /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
 624          * RDMA sink */
 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         /* looking for pre-mapping MR */
 640         mr = kiblnd_find_rd_dma_mr(hdev, rd);
 641         if (mr != NULL) {
 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 != NULL)
 648                 return kiblnd_fmr_map_tx(net, tx, rd, nob);
 649
 650         return -EINVAL;
 651 }
 652
 653
 654 static int
 655 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
 656                     unsigned int niov, struct kvec *iov, int offset, int nob)
 657 {
 658         kib_net_t *net = ni->ni_data;
 659         struct page *page;
 660         struct scatterlist *sg;
 661         unsigned long vaddr;
 662         int fragnob;
 663         int page_offset;
 664
 665         LASSERT(nob > 0);
 666         LASSERT(niov > 0);
 667         LASSERT(net != NULL);
 668
 669         while (offset >= iov->iov_len) {
 670                 offset -= iov->iov_len;
 671                 niov--;
 672                 iov++;
 673                 LASSERT(niov > 0);
 674         }
 675
 676         sg = tx->tx_frags;
 677         do {
 678                 LASSERT(niov > 0);
 679
 680                 vaddr = ((unsigned long)iov->iov_base) + offset;
 681                 page_offset = vaddr & (PAGE_SIZE - 1);
 682                 page = kiblnd_kvaddr_to_page(vaddr);
 683                 if (page == NULL) {
 684                         CERROR("Can't find page\n");
 685                         return -EFAULT;
 686                 }
 687
 688                 fragnob = min((int)(iov->iov_len - offset), nob);
 689                 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
 690
 691                 sg_set_page(sg, page, fragnob, page_offset);
 692                 sg++;
 693
 694                 if (offset + fragnob < iov->iov_len) {
 695                         offset += fragnob;
 696                 } else {
 697                         offset = 0;
 698                         iov++;
 699                         niov--;
 700                 }
 701                 nob -= fragnob;
 702         } while (nob > 0);
 703
 704         return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
 705 }
 706
 707 static int
 708 kiblnd_setup_rd_kiov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
 709                       int nkiov, lnet_kiov_t *kiov, int offset, int nob)
 710 {
 711         kib_net_t *net = ni->ni_data;
 712         struct scatterlist *sg;
 713         int fragnob;
 714
 715         CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
 716
 717         LASSERT(nob > 0);
 718         LASSERT(nkiov > 0);
 719         LASSERT(net != NULL);
 720
 721         while (offset >= kiov->kiov_len) {
 722                 offset -= kiov->kiov_len;
 723                 nkiov--;
 724                 kiov++;
 725                 LASSERT(nkiov > 0);
 726         }
 727
 728         sg = tx->tx_frags;
 729         do {
 730                 LASSERT(nkiov > 0);
 731
 732                 fragnob = min((int)(kiov->kiov_len - offset), nob);
 733
 734                 sg_set_page(sg, kiov->kiov_page, fragnob,
 735                             kiov->kiov_offset + offset);
 736                 sg++;
 737
 738                 offset = 0;
 739                 kiov++;
 740                 nkiov--;
 741                 nob -= fragnob;
 742         } while (nob > 0);
 743
 744         return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
 745 }
 746
 747 static int
 748 kiblnd_post_tx_locked(kib_conn_t *conn, kib_tx_t *tx, int credit)
 749         __releases(conn->ibc_lock)
 750         __acquires(conn->ibc_lock)
 751 {
 752         kib_msg_t *msg = tx->tx_msg;
 753         kib_peer_t *peer = conn->ibc_peer;
 754         int ver = conn->ibc_version;
 755         int rc;
 756         int done;
 757         struct ib_send_wr *bad_wrq;
 758
 759         LASSERT(tx->tx_queued);
 760         /* We rely on this for QP sizing */
 761         LASSERT(tx->tx_nwrq > 0);
 762         LASSERT(tx->tx_nwrq <= 1 + IBLND_RDMA_FRAGS(ver));
 763
 764         LASSERT(credit == 0 || credit == 1);
 765         LASSERT(conn->ibc_outstanding_credits >= 0);
 766         LASSERT(conn->ibc_outstanding_credits <= IBLND_MSG_QUEUE_SIZE(ver));
 767         LASSERT(conn->ibc_credits >= 0);
 768         LASSERT(conn->ibc_credits <= IBLND_MSG_QUEUE_SIZE(ver));
 769
 770         if (conn->ibc_nsends_posted == IBLND_CONCURRENT_SENDS(ver)) {
 771                 /* tx completions outstanding... */
 772                 CDEBUG(D_NET, "%s: posted enough\n",
 773                        libcfs_nid2str(peer->ibp_nid));
 774                 return -EAGAIN;
 775         }
 776
 777         if (credit != 0 && conn->ibc_credits == 0) {   /* no credits */
 778                 CDEBUG(D_NET, "%s: no credits\n",
 779                        libcfs_nid2str(peer->ibp_nid));
 780                 return -EAGAIN;
 781         }
 782
 783         if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
 784             conn->ibc_credits == 1 &&   /* last credit reserved */
 785             msg->ibm_type != IBLND_MSG_NOOP) {      /* for NOOP */
 786                 CDEBUG(D_NET, "%s: not using last credit\n",
 787                        libcfs_nid2str(peer->ibp_nid));
 788                 return -EAGAIN;
 789         }
 790
 791         /* NB don't drop ibc_lock before bumping tx_sending */
 792         list_del(&tx->tx_list);
 793         tx->tx_queued = 0;
 794
 795         if (msg->ibm_type == IBLND_MSG_NOOP &&
 796             (!kiblnd_need_noop(conn) ||     /* redundant NOOP */
 797              (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
 798               conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
 799                 /* OK to drop when posted enough NOOPs, since
 800                  * kiblnd_check_sends will queue NOOP again when
 801                  * posted NOOPs complete */
 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         /* CAVEAT EMPTOR!  This tx could be the PUT_DONE of an RDMA
 821          * PUT.  If so, it was first queued here as a PUT_REQ, sent and
 822          * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
 823          * and then re-queued here.  It's (just) possible that
 824          * tx_sending is non-zero if we've not done the tx_complete()
 825          * from the first send; hence the ++ rather than = below. */
 826         tx->tx_sending++;
 827         list_add(&tx->tx_list, &conn->ibc_active_txs);
 828
 829         /* I'm still holding ibc_lock! */
 830         if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
 831                 rc = -ECONNABORTED;
 832         } else if (tx->tx_pool->tpo_pool.po_failed ||
 833                  conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
 834                 /* close_conn will launch failover */
 835                 rc = -ENETDOWN;
 836         } else {
 837                 rc = ib_post_send(conn->ibc_cmid->qp, tx->tx_wrq, &bad_wrq);
 838         }
 839
 840         conn->ibc_last_send = jiffies;
 841
 842         if (rc == 0)
 843                 return 0;
 844
 845         /* NB credits are transferred in the actual
 846          * message, which can only be the last work item */
 847         conn->ibc_credits += credit;
 848         conn->ibc_outstanding_credits += msg->ibm_credits;
 849         conn->ibc_nsends_posted--;
 850         if (msg->ibm_type == IBLND_MSG_NOOP)
 851                 conn->ibc_noops_posted--;
 852
 853         tx->tx_status = rc;
 854         tx->tx_waiting = 0;
 855         tx->tx_sending--;
 856
 857         done = (tx->tx_sending == 0);
 858         if (done)
 859                 list_del(&tx->tx_list);
 860
 861         spin_unlock(&conn->ibc_lock);
 862
 863         if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
 864                 CERROR("Error %d posting transmit to %s\n",
 865                        rc, libcfs_nid2str(peer->ibp_nid));
 866         else
 867                 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
 868                        rc, libcfs_nid2str(peer->ibp_nid));
 869
 870         kiblnd_close_conn(conn, rc);
 871
 872         if (done)
 873                 kiblnd_tx_done(peer->ibp_ni, tx);
 874
 875         spin_lock(&conn->ibc_lock);
 876
 877         return -EIO;
 878 }
 879
 880 void
 881 kiblnd_check_sends(kib_conn_t *conn)
 882 {
 883         int ver = conn->ibc_version;
 884         lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
 885         kib_tx_t *tx;
 886
 887         /* Don't send anything until after the connection is established */
 888         if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
 889                 CDEBUG(D_NET, "%s too soon\n",
 890                        libcfs_nid2str(conn->ibc_peer->ibp_nid));
 891                 return;
 892         }
 893
 894         spin_lock(&conn->ibc_lock);
 895
 896         LASSERT(conn->ibc_nsends_posted <= IBLND_CONCURRENT_SENDS(ver));
 897         LASSERT(!IBLND_OOB_CAPABLE(ver) ||
 898                  conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
 899         LASSERT(conn->ibc_reserved_credits >= 0);
 900
 901         while (conn->ibc_reserved_credits > 0 &&
 902                !list_empty(&conn->ibc_tx_queue_rsrvd)) {
 903                 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
 904                                     kib_tx_t, tx_list);
 905                 list_del(&tx->tx_list);
 906                 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
 907                 conn->ibc_reserved_credits--;
 908         }
 909
 910         if (kiblnd_need_noop(conn)) {
 911                 spin_unlock(&conn->ibc_lock);
 912
 913                 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
 914                 if (tx != NULL)
 915                         kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
 916
 917                 spin_lock(&conn->ibc_lock);
 918                 if (tx != NULL)
 919                         kiblnd_queue_tx_locked(tx, conn);
 920         }
 921
 922         kiblnd_conn_addref(conn); /* 1 ref for me.... (see b21911) */
 923
 924         for (;;) {
 925                 int credit;
 926
 927                 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
 928                         credit = 0;
 929                         tx = list_entry(conn->ibc_tx_queue_nocred.next,
 930                                             kib_tx_t, tx_list);
 931                 } else if (!list_empty(&conn->ibc_tx_noops)) {
 932                         LASSERT(!IBLND_OOB_CAPABLE(ver));
 933                         credit = 1;
 934                         tx = list_entry(conn->ibc_tx_noops.next,
 935                                         kib_tx_t, tx_list);
 936                 } else if (!list_empty(&conn->ibc_tx_queue)) {
 937                         credit = 1;
 938                         tx = list_entry(conn->ibc_tx_queue.next,
 939                                             kib_tx_t, tx_list);
 940                 } else
 941                         break;
 942
 943                 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
 944                         break;
 945         }
 946
 947         spin_unlock(&conn->ibc_lock);
 948
 949         kiblnd_conn_decref(conn); /* ...until here */
 950 }
 951
 952 static void
 953 kiblnd_tx_complete(kib_tx_t *tx, int status)
 954 {
 955         int failed = (status != IB_WC_SUCCESS);
 956         kib_conn_t *conn = tx->tx_conn;
 957         int idle;
 958
 959         LASSERT(tx->tx_sending > 0);
 960
 961         if (failed) {
 962                 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
 963                         CNETERR("Tx -> %s cookie %#llx sending %d waiting %d: failed %d\n",
 964                                 libcfs_nid2str(conn->ibc_peer->ibp_nid),
 965                                 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
 966                                 status);
 967
 968                 kiblnd_close_conn(conn, -EIO);
 969         } else {
 970                 kiblnd_peer_alive(conn->ibc_peer);
 971         }
 972
 973         spin_lock(&conn->ibc_lock);
 974
 975         /* I could be racing with rdma completion.  Whoever makes 'tx' idle
 976          * gets to free it, which also drops its ref on 'conn'. */
 977
 978         tx->tx_sending--;
 979         conn->ibc_nsends_posted--;
 980         if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
 981                 conn->ibc_noops_posted--;
 982
 983         if (failed) {
 984                 tx->tx_waiting = 0;          /* don't wait for peer */
 985                 tx->tx_status = -EIO;
 986         }
 987
 988         idle = (tx->tx_sending == 0) &&  /* This is the final callback */
 989                !tx->tx_waiting &&              /* Not waiting for peer */
 990                !tx->tx_queued;            /* Not re-queued (PUT_DONE) */
 991         if (idle)
 992                 list_del(&tx->tx_list);
 993
 994         kiblnd_conn_addref(conn);              /* 1 ref for me.... */
 995
 996         spin_unlock(&conn->ibc_lock);
 997
 998         if (idle)
 999                 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1000
1001         kiblnd_check_sends(conn);
1002
1003         kiblnd_conn_decref(conn);              /* ...until here */
1004 }
1005
1006 void
1007 kiblnd_init_tx_msg(lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1008 {
1009         kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1010         struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1011         struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1012         int nob = offsetof(kib_msg_t, ibm_u) + body_nob;
1013         struct ib_mr *mr;
1014
1015         LASSERT(tx->tx_nwrq >= 0);
1016         LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1017         LASSERT(nob <= IBLND_MSG_SIZE);
1018
1019         kiblnd_init_msg(tx->tx_msg, type, body_nob);
1020
1021         mr = kiblnd_find_dma_mr(hdev, tx->tx_msgaddr, nob);
1022         LASSERT(mr != NULL);
1023
1024         sge->lkey   = mr->lkey;
1025         sge->addr   = tx->tx_msgaddr;
1026         sge->length = nob;
1027
1028         memset(wrq, 0, sizeof(*wrq));
1029
1030         wrq->next       = NULL;
1031         wrq->wr_id      = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1032         wrq->sg_list    = sge;
1033         wrq->num_sge    = 1;
1034         wrq->opcode     = IB_WR_SEND;
1035         wrq->send_flags = IB_SEND_SIGNALED;
1036
1037         tx->tx_nwrq++;
1038 }
1039
1040 int
1041 kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
1042                   int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1043 {
1044         kib_msg_t *ibmsg = tx->tx_msg;
1045         kib_rdma_desc_t *srcrd = tx->tx_rd;
1046         struct ib_sge *sge = &tx->tx_sge[0];
1047         struct ib_send_wr *wrq = &tx->tx_wrq[0];
1048         int rc  = resid;
1049         int srcidx;
1050         int dstidx;
1051         int wrknob;
1052
1053         LASSERT(!in_interrupt());
1054         LASSERT(tx->tx_nwrq == 0);
1055         LASSERT(type == IBLND_MSG_GET_DONE ||
1056                  type == IBLND_MSG_PUT_DONE);
1057
1058         srcidx = dstidx = 0;
1059
1060         while (resid > 0) {
1061                 if (srcidx >= srcrd->rd_nfrags) {
1062                         CERROR("Src buffer exhausted: %d frags\n", srcidx);
1063                         rc = -EPROTO;
1064                         break;
1065                 }
1066
1067                 if (dstidx == dstrd->rd_nfrags) {
1068                         CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1069                         rc = -EPROTO;
1070                         break;
1071                 }
1072
1073                 if (tx->tx_nwrq == IBLND_RDMA_FRAGS(conn->ibc_version)) {
1074                         CERROR("RDMA too fragmented for %s (%d): %d/%d src %d/%d dst frags\n",
1075                                libcfs_nid2str(conn->ibc_peer->ibp_nid),
1076                                IBLND_RDMA_FRAGS(conn->ibc_version),
1077                                srcidx, srcrd->rd_nfrags,
1078                                dstidx, dstrd->rd_nfrags);
1079                         rc = -EMSGSIZE;
1080                         break;
1081                 }
1082
1083                 wrknob = min(min(kiblnd_rd_frag_size(srcrd, srcidx),
1084                                  kiblnd_rd_frag_size(dstrd, dstidx)),
1085                              (__u32) resid);
1086
1087                 sge = &tx->tx_sge[tx->tx_nwrq];
1088                 sge->addr   = kiblnd_rd_frag_addr(srcrd, srcidx);
1089                 sge->lkey   = kiblnd_rd_frag_key(srcrd, srcidx);
1090                 sge->length = wrknob;
1091
1092                 wrq = &tx->tx_wrq[tx->tx_nwrq];
1093
1094                 wrq->next       = wrq + 1;
1095                 wrq->wr_id      = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1096                 wrq->sg_list    = sge;
1097                 wrq->num_sge    = 1;
1098                 wrq->opcode     = IB_WR_RDMA_WRITE;
1099                 wrq->send_flags = 0;
1100
1101                 wrq->wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1102                 wrq->wr.rdma.rkey        = kiblnd_rd_frag_key(dstrd, dstidx);
1103
1104                 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1105                 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1106
1107                 resid -= wrknob;
1108
1109                 tx->tx_nwrq++;
1110                 wrq++;
1111                 sge++;
1112         }
1113
1114         if (rc < 0)                          /* no RDMA if completing with failure */
1115                 tx->tx_nwrq = 0;
1116
1117         ibmsg->ibm_u.completion.ibcm_status = rc;
1118         ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1119         kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1120                            type, sizeof(kib_completion_msg_t));
1121
1122         return rc;
1123 }
1124
1125 void
1126 kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn)
1127 {
1128         struct list_head *q;
1129
1130         LASSERT(tx->tx_nwrq > 0);             /* work items set up */
1131         LASSERT(!tx->tx_queued);               /* not queued for sending already */
1132         LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1133
1134         tx->tx_queued = 1;
1135         tx->tx_deadline = jiffies + (*kiblnd_tunables.kib_timeout * HZ);
1136
1137         if (tx->tx_conn == NULL) {
1138                 kiblnd_conn_addref(conn);
1139                 tx->tx_conn = conn;
1140                 LASSERT(tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1141         } else {
1142                 /* PUT_DONE first attached to conn as a PUT_REQ */
1143                 LASSERT(tx->tx_conn == conn);
1144                 LASSERT(tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1145         }
1146
1147         switch (tx->tx_msg->ibm_type) {
1148         default:
1149                 LBUG();
1150
1151         case IBLND_MSG_PUT_REQ:
1152         case IBLND_MSG_GET_REQ:
1153                 q = &conn->ibc_tx_queue_rsrvd;
1154                 break;
1155
1156         case IBLND_MSG_PUT_NAK:
1157         case IBLND_MSG_PUT_ACK:
1158         case IBLND_MSG_PUT_DONE:
1159         case IBLND_MSG_GET_DONE:
1160                 q = &conn->ibc_tx_queue_nocred;
1161                 break;
1162
1163         case IBLND_MSG_NOOP:
1164                 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1165                         q = &conn->ibc_tx_queue_nocred;
1166                 else
1167                         q = &conn->ibc_tx_noops;
1168                 break;
1169
1170         case IBLND_MSG_IMMEDIATE:
1171                 q = &conn->ibc_tx_queue;
1172                 break;
1173         }
1174
1175         list_add_tail(&tx->tx_list, q);
1176 }
1177
1178 void
1179 kiblnd_queue_tx(kib_tx_t *tx, kib_conn_t *conn)
1180 {
1181         spin_lock(&conn->ibc_lock);
1182         kiblnd_queue_tx_locked(tx, conn);
1183         spin_unlock(&conn->ibc_lock);
1184
1185         kiblnd_check_sends(conn);
1186 }
1187
1188 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1189                                struct sockaddr_in *srcaddr,
1190                                struct sockaddr_in *dstaddr,
1191                                int timeout_ms)
1192 {
1193         unsigned short port;
1194         int rc;
1195
1196         /* allow the port to be reused */
1197         rc = rdma_set_reuseaddr(cmid, 1);
1198         if (rc != 0) {
1199                 CERROR("Unable to set reuse on cmid: %d\n", rc);
1200                 return rc;
1201         }
1202
1203         /* look for a free privileged port */
1204         for (port = PROT_SOCK-1; port > 0; port--) {
1205                 srcaddr->sin_port = htons(port);
1206                 rc = rdma_resolve_addr(cmid,
1207                                        (struct sockaddr *)srcaddr,
1208                                        (struct sockaddr *)dstaddr,
1209                                        timeout_ms);
1210                 if (rc == 0) {
1211                         CDEBUG(D_NET, "bound to port %hu\n", port);
1212                         return 0;
1213                 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1214                         CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1215                                port, rc);
1216                 } else {
1217                         return rc;
1218                 }
1219         }
1220
1221         CERROR("Failed to bind to a free privileged port\n");
1222         return rc;
1223 }
1224
1225 static void
1226 kiblnd_connect_peer(kib_peer_t *peer)
1227 {
1228         struct rdma_cm_id *cmid;
1229         kib_dev_t *dev;
1230         kib_net_t *net = peer->ibp_ni->ni_data;
1231         struct sockaddr_in srcaddr;
1232         struct sockaddr_in dstaddr;
1233         int rc;
1234
1235         LASSERT(net != NULL);
1236         LASSERT(peer->ibp_connecting > 0);
1237
1238         cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1239                                      IB_QPT_RC);
1240
1241         if (IS_ERR(cmid)) {
1242                 CERROR("Can't create CMID for %s: %ld\n",
1243                        libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1244                 rc = PTR_ERR(cmid);
1245                 goto failed;
1246         }
1247
1248         dev = net->ibn_dev;
1249         memset(&srcaddr, 0, sizeof(srcaddr));
1250         srcaddr.sin_family = AF_INET;
1251         srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1252
1253         memset(&dstaddr, 0, sizeof(dstaddr));
1254         dstaddr.sin_family = AF_INET;
1255         dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1256         dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1257
1258         kiblnd_peer_addref(peer);              /* cmid's ref */
1259
1260         if (*kiblnd_tunables.kib_use_priv_port) {
1261                 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1262                                          *kiblnd_tunables.kib_timeout * 1000);
1263         } else {
1264                 rc = rdma_resolve_addr(cmid,
1265                                        (struct sockaddr *)&srcaddr,
1266                                        (struct sockaddr *)&dstaddr,
1267                                        *kiblnd_tunables.kib_timeout * 1000);
1268         }
1269         if (rc != 0) {
1270                 /* Can't initiate address resolution:  */
1271                 CERROR("Can't resolve addr for %s: %d\n",
1272                        libcfs_nid2str(peer->ibp_nid), rc);
1273                 goto failed2;
1274         }
1275
1276         LASSERT(cmid->device != NULL);
1277         CDEBUG(D_NET, "%s: connection bound to %s:%pI4h:%s\n",
1278                libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
1279                &dev->ibd_ifip, cmid->device->name);
1280
1281         return;
1282
1283  failed2:
1284         kiblnd_peer_decref(peer);              /* cmid's ref */
1285         rdma_destroy_id(cmid);
1286  failed:
1287         kiblnd_peer_connect_failed(peer, 1, rc);
1288 }
1289
1290 void
1291 kiblnd_launch_tx(lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1292 {
1293         kib_peer_t *peer;
1294         kib_peer_t *peer2;
1295         kib_conn_t *conn;
1296         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1297         unsigned long flags;
1298         int rc;
1299
1300         /* If I get here, I've committed to send, so I complete the tx with
1301          * failure on any problems */
1302
1303         LASSERT(tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1304         LASSERT(tx == NULL || tx->tx_nwrq > 0);     /* work items have been set up */
1305
1306         /* First time, just use a read lock since I expect to find my peer
1307          * connected */
1308         read_lock_irqsave(g_lock, flags);
1309
1310         peer = kiblnd_find_peer_locked(nid);
1311         if (peer != NULL && !list_empty(&peer->ibp_conns)) {
1312                 /* Found a peer with an established connection */
1313                 conn = kiblnd_get_conn_locked(peer);
1314                 kiblnd_conn_addref(conn); /* 1 ref for me... */
1315
1316                 read_unlock_irqrestore(g_lock, flags);
1317
1318                 if (tx != NULL)
1319                         kiblnd_queue_tx(tx, conn);
1320                 kiblnd_conn_decref(conn); /* ...to here */
1321                 return;
1322         }
1323
1324         read_unlock(g_lock);
1325         /* Re-try with a write lock */
1326         write_lock(g_lock);
1327
1328         peer = kiblnd_find_peer_locked(nid);
1329         if (peer != NULL) {
1330                 if (list_empty(&peer->ibp_conns)) {
1331                         /* found a peer, but it's still connecting... */
1332                         LASSERT(peer->ibp_connecting != 0 ||
1333                                  peer->ibp_accepting != 0);
1334                         if (tx != NULL)
1335                                 list_add_tail(&tx->tx_list,
1336                                                   &peer->ibp_tx_queue);
1337                         write_unlock_irqrestore(g_lock, flags);
1338                 } else {
1339                         conn = kiblnd_get_conn_locked(peer);
1340                         kiblnd_conn_addref(conn); /* 1 ref for me... */
1341
1342                         write_unlock_irqrestore(g_lock, flags);
1343
1344                         if (tx != NULL)
1345                                 kiblnd_queue_tx(tx, conn);
1346                         kiblnd_conn_decref(conn); /* ...to here */
1347                 }
1348                 return;
1349         }
1350
1351         write_unlock_irqrestore(g_lock, flags);
1352
1353         /* Allocate a peer ready to add to the peer table and retry */
1354         rc = kiblnd_create_peer(ni, &peer, nid);
1355         if (rc != 0) {
1356                 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1357                 if (tx != NULL) {
1358                         tx->tx_status = -EHOSTUNREACH;
1359                         tx->tx_waiting = 0;
1360                         kiblnd_tx_done(ni, tx);
1361                 }
1362                 return;
1363         }
1364
1365         write_lock_irqsave(g_lock, flags);
1366
1367         peer2 = kiblnd_find_peer_locked(nid);
1368         if (peer2 != NULL) {
1369                 if (list_empty(&peer2->ibp_conns)) {
1370                         /* found a peer, but it's still connecting... */
1371                         LASSERT(peer2->ibp_connecting != 0 ||
1372                                  peer2->ibp_accepting != 0);
1373                         if (tx != NULL)
1374                                 list_add_tail(&tx->tx_list,
1375                                                   &peer2->ibp_tx_queue);
1376                         write_unlock_irqrestore(g_lock, flags);
1377                 } else {
1378                         conn = kiblnd_get_conn_locked(peer2);
1379                         kiblnd_conn_addref(conn); /* 1 ref for me... */
1380
1381                         write_unlock_irqrestore(g_lock, flags);
1382
1383                         if (tx != NULL)
1384                                 kiblnd_queue_tx(tx, conn);
1385                         kiblnd_conn_decref(conn); /* ...to here */
1386                 }
1387
1388                 kiblnd_peer_decref(peer);
1389                 return;
1390         }
1391
1392         /* Brand new peer */
1393         LASSERT(peer->ibp_connecting == 0);
1394         peer->ibp_connecting = 1;
1395
1396         /* always called with a ref on ni, which prevents ni being shutdown */
1397         LASSERT(((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1398
1399         if (tx != NULL)
1400                 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1401
1402         kiblnd_peer_addref(peer);
1403         list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1404
1405         write_unlock_irqrestore(g_lock, flags);
1406
1407         kiblnd_connect_peer(peer);
1408         kiblnd_peer_decref(peer);
1409 }
1410
1411 int
1412 kiblnd_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1413 {
1414         lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1415         int type = lntmsg->msg_type;
1416         lnet_process_id_t target = lntmsg->msg_target;
1417         int target_is_router = lntmsg->msg_target_is_router;
1418         int routing = lntmsg->msg_routing;
1419         unsigned int payload_niov = lntmsg->msg_niov;
1420         struct kvec *payload_iov = lntmsg->msg_iov;
1421         lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1422         unsigned int payload_offset = lntmsg->msg_offset;
1423         unsigned int payload_nob = lntmsg->msg_len;
1424         kib_msg_t *ibmsg;
1425         kib_tx_t *tx;
1426         int nob;
1427         int rc;
1428
1429         /* NB 'private' is different depending on what we're sending.... */
1430
1431         CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1432                payload_nob, payload_niov, libcfs_id2str(target));
1433
1434         LASSERT(payload_nob == 0 || payload_niov > 0);
1435         LASSERT(payload_niov <= LNET_MAX_IOV);
1436
1437         /* Thread context */
1438         LASSERT(!in_interrupt());
1439         /* payload is either all vaddrs or all pages */
1440         LASSERT(!(payload_kiov != NULL && payload_iov != NULL));
1441
1442         switch (type) {
1443         default:
1444                 LBUG();
1445                 return -EIO;
1446
1447         case LNET_MSG_ACK:
1448                 LASSERT(payload_nob == 0);
1449                 break;
1450
1451         case LNET_MSG_GET:
1452                 if (routing || target_is_router)
1453                         break;            /* send IMMEDIATE */
1454
1455                 /* is the REPLY message too small for RDMA? */
1456                 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1457                 if (nob <= IBLND_MSG_SIZE)
1458                         break;            /* send IMMEDIATE */
1459
1460                 tx = kiblnd_get_idle_tx(ni, target.nid);
1461                 if (tx == NULL) {
1462                         CERROR("Can't allocate txd for GET to %s\n",
1463                                libcfs_nid2str(target.nid));
1464                         return -ENOMEM;
1465                 }
1466
1467                 ibmsg = tx->tx_msg;
1468
1469                 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1470                         rc = kiblnd_setup_rd_iov(ni, tx,
1471                                                  &ibmsg->ibm_u.get.ibgm_rd,
1472                                                  lntmsg->msg_md->md_niov,
1473                                                  lntmsg->msg_md->md_iov.iov,
1474                                                  0, lntmsg->msg_md->md_length);
1475                 else
1476                         rc = kiblnd_setup_rd_kiov(ni, tx,
1477                                                   &ibmsg->ibm_u.get.ibgm_rd,
1478                                                   lntmsg->msg_md->md_niov,
1479                                                   lntmsg->msg_md->md_iov.kiov,
1480                                                   0, lntmsg->msg_md->md_length);
1481                 if (rc != 0) {
1482                         CERROR("Can't setup GET sink for %s: %d\n",
1483                                libcfs_nid2str(target.nid), rc);
1484                         kiblnd_tx_done(ni, tx);
1485                         return -EIO;
1486                 }
1487
1488                 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[tx->tx_nfrags]);
1489                 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1490                 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1491
1492                 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1493
1494                 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1495                 if (tx->tx_lntmsg[1] == NULL) {
1496                         CERROR("Can't create reply for GET -> %s\n",
1497                                libcfs_nid2str(target.nid));
1498                         kiblnd_tx_done(ni, tx);
1499                         return -EIO;
1500                 }
1501
1502                 tx->tx_lntmsg[0] = lntmsg;      /* finalise lntmsg[0,1] on completion */
1503                 tx->tx_waiting = 1;          /* waiting for GET_DONE */
1504                 kiblnd_launch_tx(ni, tx, target.nid);
1505                 return 0;
1506
1507         case LNET_MSG_REPLY:
1508         case LNET_MSG_PUT:
1509                 /* Is the payload small enough not to need RDMA? */
1510                 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1511                 if (nob <= IBLND_MSG_SIZE)
1512                         break;            /* send IMMEDIATE */
1513
1514                 tx = kiblnd_get_idle_tx(ni, target.nid);
1515                 if (tx == NULL) {
1516                         CERROR("Can't allocate %s txd for %s\n",
1517                                type == LNET_MSG_PUT ? "PUT" : "REPLY",
1518                                libcfs_nid2str(target.nid));
1519                         return -ENOMEM;
1520                 }
1521
1522                 if (payload_kiov == NULL)
1523                         rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1524                                                  payload_niov, payload_iov,
1525                                                  payload_offset, payload_nob);
1526                 else
1527                         rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1528                                                   payload_niov, payload_kiov,
1529                                                   payload_offset, payload_nob);
1530                 if (rc != 0) {
1531                         CERROR("Can't setup PUT src for %s: %d\n",
1532                                libcfs_nid2str(target.nid), rc);
1533                         kiblnd_tx_done(ni, tx);
1534                         return -EIO;
1535                 }
1536
1537                 ibmsg = tx->tx_msg;
1538                 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1539                 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1540                 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1541
1542                 tx->tx_lntmsg[0] = lntmsg;      /* finalise lntmsg on completion */
1543                 tx->tx_waiting = 1;          /* waiting for PUT_{ACK,NAK} */
1544                 kiblnd_launch_tx(ni, tx, target.nid);
1545                 return 0;
1546         }
1547
1548         /* send IMMEDIATE */
1549
1550         LASSERT(offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1551                  <= IBLND_MSG_SIZE);
1552
1553         tx = kiblnd_get_idle_tx(ni, target.nid);
1554         if (tx == NULL) {
1555                 CERROR("Can't send %d to %s: tx descs exhausted\n",
1556                         type, libcfs_nid2str(target.nid));
1557                 return -ENOMEM;
1558         }
1559
1560         ibmsg = tx->tx_msg;
1561         ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1562
1563         if (payload_kiov != NULL)
1564                 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1565                                     offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1566                                     payload_niov, payload_kiov,
1567                                     payload_offset, payload_nob);
1568         else
1569                 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1570                                    offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1571                                    payload_niov, payload_iov,
1572                                    payload_offset, payload_nob);
1573
1574         nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1575         kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1576
1577         tx->tx_lntmsg[0] = lntmsg;            /* finalise lntmsg on completion */
1578         kiblnd_launch_tx(ni, tx, target.nid);
1579         return 0;
1580 }
1581
1582 static void
1583 kiblnd_reply(lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1584 {
1585         lnet_process_id_t target = lntmsg->msg_target;
1586         unsigned int niov = lntmsg->msg_niov;
1587         struct kvec *iov = lntmsg->msg_iov;
1588         lnet_kiov_t *kiov = lntmsg->msg_kiov;
1589         unsigned int offset = lntmsg->msg_offset;
1590         unsigned int nob = lntmsg->msg_len;
1591         kib_tx_t *tx;
1592         int rc;
1593
1594         tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1595         if (tx == NULL) {
1596                 CERROR("Can't get tx for REPLY to %s\n",
1597                        libcfs_nid2str(target.nid));
1598                 goto failed_0;
1599         }
1600
1601         if (nob == 0)
1602                 rc = 0;
1603         else if (kiov == NULL)
1604                 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1605                                          niov, iov, offset, nob);
1606         else
1607                 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1608                                           niov, kiov, offset, nob);
1609
1610         if (rc != 0) {
1611                 CERROR("Can't setup GET src for %s: %d\n",
1612                        libcfs_nid2str(target.nid), rc);
1613                 goto failed_1;
1614         }
1615
1616         rc = kiblnd_init_rdma(rx->rx_conn, tx,
1617                               IBLND_MSG_GET_DONE, nob,
1618                               &rx->rx_msg->ibm_u.get.ibgm_rd,
1619                               rx->rx_msg->ibm_u.get.ibgm_cookie);
1620         if (rc < 0) {
1621                 CERROR("Can't setup rdma for GET from %s: %d\n",
1622                        libcfs_nid2str(target.nid), rc);
1623                 goto failed_1;
1624         }
1625
1626         if (nob == 0) {
1627                 /* No RDMA: local completion may happen now! */
1628                 lnet_finalize(ni, lntmsg, 0);
1629         } else {
1630                 /* RDMA: lnet_finalize(lntmsg) when it
1631                  * completes */
1632                 tx->tx_lntmsg[0] = lntmsg;
1633         }
1634
1635         kiblnd_queue_tx(tx, rx->rx_conn);
1636         return;
1637
1638  failed_1:
1639         kiblnd_tx_done(ni, tx);
1640  failed_0:
1641         lnet_finalize(ni, lntmsg, -EIO);
1642 }
1643
1644 int
1645 kiblnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1646              unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1647              unsigned int offset, unsigned int mlen, unsigned int rlen)
1648 {
1649         kib_rx_t *rx = private;
1650         kib_msg_t *rxmsg = rx->rx_msg;
1651         kib_conn_t *conn = rx->rx_conn;
1652         kib_tx_t *tx;
1653         kib_msg_t *txmsg;
1654         int nob;
1655         int post_credit = IBLND_POSTRX_PEER_CREDIT;
1656         int rc = 0;
1657
1658         LASSERT(mlen <= rlen);
1659         LASSERT(!in_interrupt());
1660         /* Either all pages or all vaddrs */
1661         LASSERT(!(kiov != NULL && iov != NULL));
1662
1663         switch (rxmsg->ibm_type) {
1664         default:
1665                 LBUG();
1666
1667         case IBLND_MSG_IMMEDIATE:
1668                 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1669                 if (nob > rx->rx_nob) {
1670                         CERROR("Immediate message from %s too big: %d(%d)\n",
1671                                 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1672                                 nob, rx->rx_nob);
1673                         rc = -EPROTO;
1674                         break;
1675                 }
1676
1677                 if (kiov != NULL)
1678                         lnet_copy_flat2kiov(niov, kiov, offset,
1679                                             IBLND_MSG_SIZE, rxmsg,
1680                                             offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1681                                             mlen);
1682                 else
1683                         lnet_copy_flat2iov(niov, iov, offset,
1684                                            IBLND_MSG_SIZE, rxmsg,
1685                                            offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1686                                            mlen);
1687                 lnet_finalize(ni, lntmsg, 0);
1688                 break;
1689
1690         case IBLND_MSG_PUT_REQ:
1691                 if (mlen == 0) {
1692                         lnet_finalize(ni, lntmsg, 0);
1693                         kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1694                                                rxmsg->ibm_u.putreq.ibprm_cookie);
1695                         break;
1696                 }
1697
1698                 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1699                 if (tx == NULL) {
1700                         CERROR("Can't allocate tx for %s\n",
1701                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
1702                         /* Not replying will break the connection */
1703                         rc = -ENOMEM;
1704                         break;
1705                 }
1706
1707                 txmsg = tx->tx_msg;
1708                 if (kiov == NULL)
1709                         rc = kiblnd_setup_rd_iov(ni, tx,
1710                                                  &txmsg->ibm_u.putack.ibpam_rd,
1711                                                  niov, iov, offset, mlen);
1712                 else
1713                         rc = kiblnd_setup_rd_kiov(ni, tx,
1714                                                   &txmsg->ibm_u.putack.ibpam_rd,
1715                                                   niov, kiov, offset, mlen);
1716                 if (rc != 0) {
1717                         CERROR("Can't setup PUT sink for %s: %d\n",
1718                                libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1719                         kiblnd_tx_done(ni, tx);
1720                         /* tell peer it's over */
1721                         kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1722                                                rxmsg->ibm_u.putreq.ibprm_cookie);
1723                         break;
1724                 }
1725
1726                 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[tx->tx_nfrags]);
1727                 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1728                 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1729
1730                 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1731
1732                 tx->tx_lntmsg[0] = lntmsg;      /* finalise lntmsg on completion */
1733                 tx->tx_waiting = 1;          /* waiting for PUT_DONE */
1734                 kiblnd_queue_tx(tx, conn);
1735
1736                 /* reposted buffer reserved for PUT_DONE */
1737                 post_credit = IBLND_POSTRX_NO_CREDIT;
1738                 break;
1739
1740         case IBLND_MSG_GET_REQ:
1741                 if (lntmsg != NULL) {
1742                         /* Optimized GET; RDMA lntmsg's payload */
1743                         kiblnd_reply(ni, rx, lntmsg);
1744                 } else {
1745                         /* GET didn't match anything */
1746                         kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1747                                                -ENODATA,
1748                                                rxmsg->ibm_u.get.ibgm_cookie);
1749                 }
1750                 break;
1751         }
1752
1753         kiblnd_post_rx(rx, post_credit);
1754         return rc;
1755 }
1756
1757 int
1758 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1759 {
1760         struct task_struct *task = kthread_run(fn, arg, "%s", name);
1761
1762         if (IS_ERR(task))
1763                 return PTR_ERR(task);
1764
1765         atomic_inc(&kiblnd_data.kib_nthreads);
1766         return 0;
1767 }
1768
1769 static void
1770 kiblnd_thread_fini(void)
1771 {
1772         atomic_dec(&kiblnd_data.kib_nthreads);
1773 }
1774
1775 void
1776 kiblnd_peer_alive(kib_peer_t *peer)
1777 {
1778         /* This is racy, but everyone's only writing cfs_time_current() */
1779         peer->ibp_last_alive = cfs_time_current();
1780         mb();
1781 }
1782
1783 static void
1784 kiblnd_peer_notify(kib_peer_t *peer)
1785 {
1786         int error = 0;
1787         unsigned long last_alive = 0;
1788         unsigned long flags;
1789
1790         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1791
1792         if (list_empty(&peer->ibp_conns) &&
1793             peer->ibp_accepting == 0 &&
1794             peer->ibp_connecting == 0 &&
1795             peer->ibp_error != 0) {
1796                 error = peer->ibp_error;
1797                 peer->ibp_error = 0;
1798
1799                 last_alive = peer->ibp_last_alive;
1800         }
1801
1802         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1803
1804         if (error != 0)
1805                 lnet_notify(peer->ibp_ni,
1806                             peer->ibp_nid, 0, last_alive);
1807 }
1808
1809 void
1810 kiblnd_close_conn_locked(kib_conn_t *conn, int error)
1811 {
1812         /* This just does the immediate housekeeping.  'error' is zero for a
1813          * normal shutdown which can happen only after the connection has been
1814          * established.  If the connection is established, schedule the
1815          * connection to be finished off by the connd.  Otherwise the connd is
1816          * already dealing with it (either to set it up or tear it down).
1817          * Caller holds kib_global_lock exclusively in irq context */
1818         kib_peer_t *peer = conn->ibc_peer;
1819         kib_dev_t *dev;
1820         unsigned long flags;
1821
1822         LASSERT(error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1823
1824         if (error != 0 && conn->ibc_comms_error == 0)
1825                 conn->ibc_comms_error = error;
1826
1827         if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1828                 return; /* already being handled  */
1829
1830         if (error == 0 &&
1831             list_empty(&conn->ibc_tx_noops) &&
1832             list_empty(&conn->ibc_tx_queue) &&
1833             list_empty(&conn->ibc_tx_queue_rsrvd) &&
1834             list_empty(&conn->ibc_tx_queue_nocred) &&
1835             list_empty(&conn->ibc_active_txs)) {
1836                 CDEBUG(D_NET, "closing conn to %s\n",
1837                        libcfs_nid2str(peer->ibp_nid));
1838         } else {
1839                 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1840                        libcfs_nid2str(peer->ibp_nid), error,
1841                        list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1842                        list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1843                        list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
1844                        list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
1845                        list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1846         }
1847
1848         dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
1849         list_del(&conn->ibc_list);
1850         /* connd (see below) takes over ibc_list's ref */
1851
1852         if (list_empty(&peer->ibp_conns) &&    /* no more conns */
1853             kiblnd_peer_active(peer)) {  /* still in peer table */
1854                 kiblnd_unlink_peer_locked(peer);
1855
1856                 /* set/clear error on last conn */
1857                 peer->ibp_error = conn->ibc_comms_error;
1858         }
1859
1860         kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1861
1862         if (error != 0 &&
1863             kiblnd_dev_can_failover(dev)) {
1864                 list_add_tail(&dev->ibd_fail_list,
1865                               &kiblnd_data.kib_failed_devs);
1866                 wake_up(&kiblnd_data.kib_failover_waitq);
1867         }
1868
1869         spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1870
1871         list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1872         wake_up(&kiblnd_data.kib_connd_waitq);
1873
1874         spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1875 }
1876
1877 void
1878 kiblnd_close_conn(kib_conn_t *conn, int error)
1879 {
1880         unsigned long flags;
1881
1882         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1883
1884         kiblnd_close_conn_locked(conn, error);
1885
1886         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1887 }
1888
1889 static void
1890 kiblnd_handle_early_rxs(kib_conn_t *conn)
1891 {
1892         unsigned long flags;
1893         kib_rx_t *rx;
1894         kib_rx_t *tmp;
1895
1896         LASSERT(!in_interrupt());
1897         LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1898
1899         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1900         list_for_each_entry_safe(rx, tmp, &conn->ibc_early_rxs, rx_list) {
1901                 list_del(&rx->rx_list);
1902                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1903
1904                 kiblnd_handle_rx(rx);
1905
1906                 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1907         }
1908         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1909 }
1910
1911 static void
1912 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
1913 {
1914         LIST_HEAD(zombies);
1915         struct list_head *tmp;
1916         struct list_head *nxt;
1917         kib_tx_t *tx;
1918
1919         spin_lock(&conn->ibc_lock);
1920
1921         list_for_each_safe(tmp, nxt, txs) {
1922                 tx = list_entry(tmp, kib_tx_t, tx_list);
1923
1924                 if (txs == &conn->ibc_active_txs) {
1925                         LASSERT(!tx->tx_queued);
1926                         LASSERT(tx->tx_waiting ||
1927                                  tx->tx_sending != 0);
1928                 } else {
1929                         LASSERT(tx->tx_queued);
1930                 }
1931
1932                 tx->tx_status = -ECONNABORTED;
1933                 tx->tx_waiting = 0;
1934
1935                 if (tx->tx_sending == 0) {
1936                         tx->tx_queued = 0;
1937                         list_del(&tx->tx_list);
1938                         list_add(&tx->tx_list, &zombies);
1939                 }
1940         }
1941
1942         spin_unlock(&conn->ibc_lock);
1943
1944         kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
1945 }
1946
1947 static void
1948 kiblnd_finalise_conn(kib_conn_t *conn)
1949 {
1950         LASSERT(!in_interrupt());
1951         LASSERT(conn->ibc_state > IBLND_CONN_INIT);
1952
1953         kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
1954
1955         /* abort_receives moves QP state to IB_QPS_ERR.  This is only required
1956          * for connections that didn't get as far as being connected, because
1957          * rdma_disconnect() does this for free. */
1958         kiblnd_abort_receives(conn);
1959
1960         /* Complete all tx descs not waiting for sends to complete.
1961          * NB we should be safe from RDMA now that the QP has changed state */
1962
1963         kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
1964         kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
1965         kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
1966         kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
1967         kiblnd_abort_txs(conn, &conn->ibc_active_txs);
1968
1969         kiblnd_handle_early_rxs(conn);
1970 }
1971
1972 void
1973 kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error)
1974 {
1975         LIST_HEAD(zombies);
1976         unsigned long flags;
1977
1978         LASSERT(error != 0);
1979         LASSERT(!in_interrupt());
1980
1981         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1982
1983         if (active) {
1984                 LASSERT(peer->ibp_connecting > 0);
1985                 peer->ibp_connecting--;
1986         } else {
1987                 LASSERT(peer->ibp_accepting > 0);
1988                 peer->ibp_accepting--;
1989         }
1990
1991         if (peer->ibp_connecting != 0 ||
1992             peer->ibp_accepting != 0) {
1993                 /* another connection attempt under way... */
1994                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
1995                                             flags);
1996                 return;
1997         }
1998
1999         if (list_empty(&peer->ibp_conns)) {
2000                 /* Take peer's blocked transmits to complete with error */
2001                 list_add(&zombies, &peer->ibp_tx_queue);
2002                 list_del_init(&peer->ibp_tx_queue);
2003
2004                 if (kiblnd_peer_active(peer))
2005                         kiblnd_unlink_peer_locked(peer);
2006
2007                 peer->ibp_error = error;
2008         } else {
2009                 /* Can't have blocked transmits if there are connections */
2010                 LASSERT(list_empty(&peer->ibp_tx_queue));
2011         }
2012
2013         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2014
2015         kiblnd_peer_notify(peer);
2016
2017         if (list_empty(&zombies))
2018                 return;
2019
2020         CNETERR("Deleting messages for %s: connection failed\n",
2021                 libcfs_nid2str(peer->ibp_nid));
2022
2023         kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2024 }
2025
2026 void
2027 kiblnd_connreq_done(kib_conn_t *conn, int status)
2028 {
2029         kib_peer_t *peer = conn->ibc_peer;
2030         kib_tx_t *tx;
2031         kib_tx_t *tmp;
2032         struct list_head txs;
2033         unsigned long flags;
2034         int active;
2035
2036         active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2037
2038         CDEBUG(D_NET, "%s: active(%d), version(%x), status(%d)\n",
2039                libcfs_nid2str(peer->ibp_nid), active,
2040                conn->ibc_version, status);
2041
2042         LASSERT(!in_interrupt());
2043         LASSERT((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2044                   peer->ibp_connecting > 0) ||
2045                  (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2046                   peer->ibp_accepting > 0));
2047
2048         LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2049         conn->ibc_connvars = NULL;
2050
2051         if (status != 0) {
2052                 /* failed to establish connection */
2053                 kiblnd_peer_connect_failed(peer, active, status);
2054                 kiblnd_finalise_conn(conn);
2055                 return;
2056         }
2057
2058         /* connection established */
2059         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2060
2061         conn->ibc_last_send = jiffies;
2062         kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2063         kiblnd_peer_alive(peer);
2064
2065         /* Add conn to peer's list and nuke any dangling conns from a different
2066          * peer instance... */
2067         kiblnd_conn_addref(conn);              /* +1 ref for ibc_list */
2068         list_add(&conn->ibc_list, &peer->ibp_conns);
2069         if (active)
2070                 peer->ibp_connecting--;
2071         else
2072                 peer->ibp_accepting--;
2073
2074         if (peer->ibp_version == 0) {
2075                 peer->ibp_version     = conn->ibc_version;
2076                 peer->ibp_incarnation = conn->ibc_incarnation;
2077         }
2078
2079         if (peer->ibp_version     != conn->ibc_version ||
2080             peer->ibp_incarnation != conn->ibc_incarnation) {
2081                 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2082                                                 conn->ibc_incarnation);
2083                 peer->ibp_version     = conn->ibc_version;
2084                 peer->ibp_incarnation = conn->ibc_incarnation;
2085         }
2086
2087         /* grab pending txs while I have the lock */
2088         list_add(&txs, &peer->ibp_tx_queue);
2089         list_del_init(&peer->ibp_tx_queue);
2090
2091         if (!kiblnd_peer_active(peer) ||        /* peer has been deleted */
2092             conn->ibc_comms_error != 0) {       /* error has happened already */
2093                 lnet_ni_t *ni = peer->ibp_ni;
2094
2095                 /* start to shut down connection */
2096                 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2097                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2098
2099                 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2100
2101                 return;
2102         }
2103
2104         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2105
2106         /* Schedule blocked txs */
2107         spin_lock(&conn->ibc_lock);
2108         list_for_each_entry_safe(tx, tmp, &txs, tx_list) {
2109                 list_del(&tx->tx_list);
2110
2111                 kiblnd_queue_tx_locked(tx, conn);
2112         }
2113         spin_unlock(&conn->ibc_lock);
2114
2115         kiblnd_check_sends(conn);
2116
2117         /* schedule blocked rxs */
2118         kiblnd_handle_early_rxs(conn);
2119 }
2120
2121 static void
2122 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2123 {
2124         int rc;
2125
2126         rc = rdma_reject(cmid, rej, sizeof(*rej));
2127
2128         if (rc != 0)
2129                 CWARN("Error %d sending reject\n", rc);
2130 }
2131
2132 static int
2133 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2134 {
2135         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2136         kib_msg_t *reqmsg = priv;
2137         kib_msg_t *ackmsg;
2138         kib_dev_t *ibdev;
2139         kib_peer_t *peer;
2140         kib_peer_t *peer2;
2141         kib_conn_t *conn;
2142         lnet_ni_t *ni  = NULL;
2143         kib_net_t *net = NULL;
2144         lnet_nid_t nid;
2145         struct rdma_conn_param cp;
2146         kib_rej_t rej;
2147         int version = IBLND_MSG_VERSION;
2148         unsigned long flags;
2149         int rc;
2150         struct sockaddr_in *peer_addr;
2151         LASSERT(!in_interrupt());
2152
2153         /* cmid inherits 'context' from the corresponding listener id */
2154         ibdev = (kib_dev_t *)cmid->context;
2155         LASSERT(ibdev != NULL);
2156
2157         memset(&rej, 0, sizeof(rej));
2158         rej.ibr_magic = IBLND_MSG_MAGIC;
2159         rej.ibr_why = IBLND_REJECT_FATAL;
2160         rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2161
2162         peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2163         if (*kiblnd_tunables.kib_require_priv_port &&
2164             ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2165                 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2166                 CERROR("Peer's port (%pI4h:%hu) is not privileged\n",
2167                        &ip, ntohs(peer_addr->sin_port));
2168                 goto failed;
2169         }
2170
2171         if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2172                 CERROR("Short connection request\n");
2173                 goto failed;
2174         }
2175
2176         /* Future protocol version compatibility support!  If the
2177          * o2iblnd-specific protocol changes, or when LNET unifies
2178          * protocols over all LNDs, the initial connection will
2179          * negotiate a protocol version.  I trap this here to avoid
2180          * console errors; the reject tells the peer which protocol I
2181          * speak. */
2182         if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2183             reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2184                 goto failed;
2185         if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2186             reqmsg->ibm_version != IBLND_MSG_VERSION &&
2187             reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2188                 goto failed;
2189         if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2190             reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2191             reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2192                 goto failed;
2193
2194         rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2195         if (rc != 0) {
2196                 CERROR("Can't parse connection request: %d\n", rc);
2197                 goto failed;
2198         }
2199
2200         nid = reqmsg->ibm_srcnid;
2201         ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2202
2203         if (ni != NULL) {
2204                 net = (kib_net_t *)ni->ni_data;
2205                 rej.ibr_incarnation = net->ibn_incarnation;
2206         }
2207
2208         if (ni == NULL ||                        /* no matching net */
2209             ni->ni_nid != reqmsg->ibm_dstnid ||   /* right NET, wrong NID! */
2210             net->ibn_dev != ibdev) {          /* wrong device */
2211                 CERROR("Can't accept %s on %s (%s:%d:%pI4h): bad dst nid %s\n",
2212                        libcfs_nid2str(nid),
2213                        ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2214                        ibdev->ibd_ifname, ibdev->ibd_nnets,
2215                        &ibdev->ibd_ifip,
2216                        libcfs_nid2str(reqmsg->ibm_dstnid));
2217
2218                 goto failed;
2219         }
2220
2221        /* check time stamp as soon as possible */
2222         if (reqmsg->ibm_dststamp != 0 &&
2223             reqmsg->ibm_dststamp != net->ibn_incarnation) {
2224                 CWARN("Stale connection request\n");
2225                 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2226                 goto failed;
2227         }
2228
2229         /* I can accept peer's version */
2230         version = reqmsg->ibm_version;
2231
2232         if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2233                 CERROR("Unexpected connreq msg type: %x from %s\n",
2234                        reqmsg->ibm_type, libcfs_nid2str(nid));
2235                 goto failed;
2236         }
2237
2238         if (reqmsg->ibm_u.connparams.ibcp_queue_depth !=
2239             IBLND_MSG_QUEUE_SIZE(version)) {
2240                 CERROR("Can't accept %s: incompatible queue depth %d (%d wanted)\n",
2241                        libcfs_nid2str(nid), reqmsg->ibm_u.connparams.ibcp_queue_depth,
2242                        IBLND_MSG_QUEUE_SIZE(version));
2243
2244                 if (version == IBLND_MSG_VERSION)
2245                         rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2246
2247                 goto failed;
2248         }
2249
2250         if (reqmsg->ibm_u.connparams.ibcp_max_frags !=
2251             IBLND_RDMA_FRAGS(version)) {
2252                 CERROR("Can't accept %s(version %x): incompatible max_frags %d (%d wanted)\n",
2253                        libcfs_nid2str(nid), version,
2254                        reqmsg->ibm_u.connparams.ibcp_max_frags,
2255                        IBLND_RDMA_FRAGS(version));
2256
2257                 if (version == IBLND_MSG_VERSION)
2258                         rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2259
2260                 goto failed;
2261
2262         }
2263
2264         if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2265                 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2266                        libcfs_nid2str(nid),
2267                        reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2268                        IBLND_MSG_SIZE);
2269                 goto failed;
2270         }
2271
2272         /* assume 'nid' is a new peer; create  */
2273         rc = kiblnd_create_peer(ni, &peer, nid);
2274         if (rc != 0) {
2275                 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2276                 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2277                 goto failed;
2278         }
2279
2280         write_lock_irqsave(g_lock, flags);
2281
2282         peer2 = kiblnd_find_peer_locked(nid);
2283         if (peer2 != NULL) {
2284                 if (peer2->ibp_version == 0) {
2285                         peer2->ibp_version     = version;
2286                         peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2287                 }
2288
2289                 /* not the guy I've talked with */
2290                 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2291                     peer2->ibp_version     != version) {
2292                         kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2293                         write_unlock_irqrestore(g_lock, flags);
2294
2295                         CWARN("Conn stale %s [old ver: %x, new ver: %x]\n",
2296                               libcfs_nid2str(nid), peer2->ibp_version, version);
2297
2298                         kiblnd_peer_decref(peer);
2299                         rej.ibr_why = IBLND_REJECT_CONN_STALE;
2300                         goto failed;
2301                 }
2302
2303                 /* tie-break connection race in favour of the higher NID */
2304                 if (peer2->ibp_connecting != 0 &&
2305                     nid < ni->ni_nid) {
2306                         write_unlock_irqrestore(g_lock, flags);
2307
2308                         CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2309
2310                         kiblnd_peer_decref(peer);
2311                         rej.ibr_why = IBLND_REJECT_CONN_RACE;
2312                         goto failed;
2313                 }
2314
2315                 peer2->ibp_accepting++;
2316                 kiblnd_peer_addref(peer2);
2317
2318                 write_unlock_irqrestore(g_lock, flags);
2319                 kiblnd_peer_decref(peer);
2320                 peer = peer2;
2321         } else {
2322                 /* Brand new peer */
2323                 LASSERT(peer->ibp_accepting == 0);
2324                 LASSERT(peer->ibp_version == 0 &&
2325                          peer->ibp_incarnation == 0);
2326
2327                 peer->ibp_accepting   = 1;
2328                 peer->ibp_version     = version;
2329                 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2330
2331                 /* I have a ref on ni that prevents it being shutdown */
2332                 LASSERT(net->ibn_shutdown == 0);
2333
2334                 kiblnd_peer_addref(peer);
2335                 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2336
2337                 write_unlock_irqrestore(g_lock, flags);
2338         }
2339
2340         conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2341         if (conn == NULL) {
2342                 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2343                 kiblnd_peer_decref(peer);
2344                 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2345                 goto failed;
2346         }
2347
2348         /* conn now "owns" cmid, so I return success from here on to ensure the
2349          * CM callback doesn't destroy cmid. */
2350
2351         conn->ibc_incarnation      = reqmsg->ibm_srcstamp;
2352         conn->ibc_credits          = IBLND_MSG_QUEUE_SIZE(version);
2353         conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(version);
2354         LASSERT(conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(version)
2355                  <= IBLND_RX_MSGS(version));
2356
2357         ackmsg = &conn->ibc_connvars->cv_msg;
2358         memset(ackmsg, 0, sizeof(*ackmsg));
2359
2360         kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2361                         sizeof(ackmsg->ibm_u.connparams));
2362         ackmsg->ibm_u.connparams.ibcp_queue_depth  = IBLND_MSG_QUEUE_SIZE(version);
2363         ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2364         ackmsg->ibm_u.connparams.ibcp_max_frags    = IBLND_RDMA_FRAGS(version);
2365
2366         kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2367
2368         memset(&cp, 0, sizeof(cp));
2369         cp.private_data = ackmsg;
2370         cp.private_data_len = ackmsg->ibm_nob;
2371         cp.responder_resources = 0;          /* No atomic ops or RDMA reads */
2372         cp.initiator_depth = 0;
2373         cp.flow_control = 1;
2374         cp.retry_count = *kiblnd_tunables.kib_retry_count;
2375         cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2376
2377         CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2378
2379         rc = rdma_accept(cmid, &cp);
2380         if (rc != 0) {
2381                 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2382                 rej.ibr_version = version;
2383                 rej.ibr_why     = IBLND_REJECT_FATAL;
2384
2385                 kiblnd_reject(cmid, &rej);
2386                 kiblnd_connreq_done(conn, rc);
2387                 kiblnd_conn_decref(conn);
2388         }
2389
2390         lnet_ni_decref(ni);
2391         return 0;
2392
2393  failed:
2394         if (ni != NULL)
2395                 lnet_ni_decref(ni);
2396
2397         rej.ibr_version             = version;
2398         rej.ibr_cp.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2399         rej.ibr_cp.ibcp_max_frags   = IBLND_RDMA_FRAGS(version);
2400         kiblnd_reject(cmid, &rej);
2401
2402         return -ECONNREFUSED;
2403 }
2404
2405 static void
2406 kiblnd_reconnect(kib_conn_t *conn, int version,
2407                   __u64 incarnation, int why, kib_connparams_t *cp)
2408 {
2409         kib_peer_t *peer = conn->ibc_peer;
2410         char *reason;
2411         int retry = 0;
2412         unsigned long flags;
2413
2414         LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2415         LASSERT(peer->ibp_connecting > 0);     /* 'conn' at least */
2416
2417         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2418
2419         /* retry connection if it's still needed and no other connection
2420          * attempts (active or passive) are in progress
2421          * NB: reconnect is still needed even when ibp_tx_queue is
2422          * empty if ibp_version != version because reconnect may be
2423          * initiated by kiblnd_query() */
2424         if ((!list_empty(&peer->ibp_tx_queue) ||
2425              peer->ibp_version != version) &&
2426             peer->ibp_connecting == 1 &&
2427             peer->ibp_accepting == 0) {
2428                 retry = 1;
2429                 peer->ibp_connecting++;
2430
2431                 peer->ibp_version     = version;
2432                 peer->ibp_incarnation = incarnation;
2433         }
2434
2435         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2436
2437         if (!retry)
2438                 return;
2439
2440         switch (why) {
2441         default:
2442                 reason = "Unknown";
2443                 break;
2444
2445         case IBLND_REJECT_CONN_STALE:
2446                 reason = "stale";
2447                 break;
2448
2449         case IBLND_REJECT_CONN_RACE:
2450                 reason = "conn race";
2451                 break;
2452
2453         case IBLND_REJECT_CONN_UNCOMPAT:
2454                 reason = "version negotiation";
2455                 break;
2456         }
2457
2458         CNETERR("%s: retrying (%s), %x, %x, queue_dep: %d, max_frag: %d, msg_size: %d\n",
2459                 libcfs_nid2str(peer->ibp_nid),
2460                 reason, IBLND_MSG_VERSION, version,
2461                 cp != NULL ? cp->ibcp_queue_depth  : IBLND_MSG_QUEUE_SIZE(version),
2462                 cp != NULL ? cp->ibcp_max_frags    : IBLND_RDMA_FRAGS(version),
2463                 cp != NULL ? cp->ibcp_max_msg_size : IBLND_MSG_SIZE);
2464
2465         kiblnd_connect_peer(peer);
2466 }
2467
2468 static void
2469 kiblnd_rejected(kib_conn_t *conn, int reason, void *priv, int priv_nob)
2470 {
2471         kib_peer_t *peer = conn->ibc_peer;
2472
2473         LASSERT(!in_interrupt());
2474         LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2475
2476         switch (reason) {
2477         case IB_CM_REJ_STALE_CONN:
2478                 kiblnd_reconnect(conn, IBLND_MSG_VERSION, 0,
2479                                  IBLND_REJECT_CONN_STALE, NULL);
2480                 break;
2481
2482         case IB_CM_REJ_INVALID_SERVICE_ID:
2483                 CNETERR("%s rejected: no listener at %d\n",
2484                         libcfs_nid2str(peer->ibp_nid),
2485                         *kiblnd_tunables.kib_service);
2486                 break;
2487
2488         case IB_CM_REJ_CONSUMER_DEFINED:
2489                 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2490                         kib_rej_t *rej = priv;
2491                         kib_connparams_t *cp = NULL;
2492                         int flip = 0;
2493                         __u64 incarnation = -1;
2494
2495                         /* NB. default incarnation is -1 because:
2496                          * a) V1 will ignore dst incarnation in connreq.
2497                          * b) V2 will provide incarnation while rejecting me,
2498                          *    -1 will be overwrote.
2499                          *
2500                          * if I try to connect to a V1 peer with V2 protocol,
2501                          * it rejected me then upgrade to V2, I have no idea
2502                          * about the upgrading and try to reconnect with V1,
2503                          * in this case upgraded V2 can find out I'm trying to
2504                          * talk to the old guy and reject me(incarnation is -1).
2505                          */
2506
2507                         if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2508                             rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2509                                 __swab32s(&rej->ibr_magic);
2510                                 __swab16s(&rej->ibr_version);
2511                                 flip = 1;
2512                         }
2513
2514                         if (priv_nob >= sizeof(kib_rej_t) &&
2515                             rej->ibr_version > IBLND_MSG_VERSION_1) {
2516                                 /* priv_nob is always 148 in current version
2517                                  * of OFED, so we still need to check version.
2518                                  * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2519                                 cp = &rej->ibr_cp;
2520
2521                                 if (flip) {
2522                                         __swab64s(&rej->ibr_incarnation);
2523                                         __swab16s(&cp->ibcp_queue_depth);
2524                                         __swab16s(&cp->ibcp_max_frags);
2525                                         __swab32s(&cp->ibcp_max_msg_size);
2526                                 }
2527
2528                                 incarnation = rej->ibr_incarnation;
2529                         }
2530
2531                         if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2532                             rej->ibr_magic != LNET_PROTO_MAGIC) {
2533                                 CERROR("%s rejected: consumer defined fatal error\n",
2534                                        libcfs_nid2str(peer->ibp_nid));
2535                                 break;
2536                         }
2537
2538                         if (rej->ibr_version != IBLND_MSG_VERSION &&
2539                             rej->ibr_version != IBLND_MSG_VERSION_1) {
2540                                 CERROR("%s rejected: o2iblnd version %x error\n",
2541                                        libcfs_nid2str(peer->ibp_nid),
2542                                        rej->ibr_version);
2543                                 break;
2544                         }
2545
2546                         if (rej->ibr_why     == IBLND_REJECT_FATAL &&
2547                             rej->ibr_version == IBLND_MSG_VERSION_1) {
2548                                 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2549                                        libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2550
2551                                 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2552                                         rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2553                         }
2554
2555                         switch (rej->ibr_why) {
2556                         case IBLND_REJECT_CONN_RACE:
2557                         case IBLND_REJECT_CONN_STALE:
2558                         case IBLND_REJECT_CONN_UNCOMPAT:
2559                                 kiblnd_reconnect(conn, rej->ibr_version,
2560                                                  incarnation, rej->ibr_why, cp);
2561                                 break;
2562
2563                         case IBLND_REJECT_MSG_QUEUE_SIZE:
2564                                 CERROR("%s rejected: incompatible message queue depth %d, %d\n",
2565                                        libcfs_nid2str(peer->ibp_nid),
2566                                        cp != NULL ? cp->ibcp_queue_depth :
2567                                        IBLND_MSG_QUEUE_SIZE(rej->ibr_version),
2568                                        IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
2569                                 break;
2570
2571                         case IBLND_REJECT_RDMA_FRAGS:
2572                                 CERROR("%s rejected: incompatible # of RDMA fragments %d, %d\n",
2573                                        libcfs_nid2str(peer->ibp_nid),
2574                                        cp != NULL ? cp->ibcp_max_frags :
2575                                        IBLND_RDMA_FRAGS(rej->ibr_version),
2576                                        IBLND_RDMA_FRAGS(conn->ibc_version));
2577                                 break;
2578
2579                         case IBLND_REJECT_NO_RESOURCES:
2580                                 CERROR("%s rejected: o2iblnd no resources\n",
2581                                        libcfs_nid2str(peer->ibp_nid));
2582                                 break;
2583
2584                         case IBLND_REJECT_FATAL:
2585                                 CERROR("%s rejected: o2iblnd fatal error\n",
2586                                        libcfs_nid2str(peer->ibp_nid));
2587                                 break;
2588
2589                         default:
2590                                 CERROR("%s rejected: o2iblnd reason %d\n",
2591                                        libcfs_nid2str(peer->ibp_nid),
2592                                        rej->ibr_why);
2593                                 break;
2594                         }
2595                         break;
2596                 }
2597                 /* fall through */
2598         default:
2599                 CNETERR("%s rejected: reason %d, size %d\n",
2600                         libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2601                 break;
2602         }
2603
2604         kiblnd_connreq_done(conn, -ECONNREFUSED);
2605 }
2606
2607 static void
2608 kiblnd_check_connreply(kib_conn_t *conn, void *priv, int priv_nob)
2609 {
2610         kib_peer_t *peer = conn->ibc_peer;
2611         lnet_ni_t *ni = peer->ibp_ni;
2612         kib_net_t *net = ni->ni_data;
2613         kib_msg_t *msg = priv;
2614         int ver = conn->ibc_version;
2615         int rc = kiblnd_unpack_msg(msg, priv_nob);
2616         unsigned long flags;
2617
2618         LASSERT(net != NULL);
2619
2620         if (rc != 0) {
2621                 CERROR("Can't unpack connack from %s: %d\n",
2622                        libcfs_nid2str(peer->ibp_nid), rc);
2623                 goto failed;
2624         }
2625
2626         if (msg->ibm_type != IBLND_MSG_CONNACK) {
2627                 CERROR("Unexpected message %d from %s\n",
2628                        msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2629                 rc = -EPROTO;
2630                 goto failed;
2631         }
2632
2633         if (ver != msg->ibm_version) {
2634                 CERROR("%s replied version %x is different with requested version %x\n",
2635                        libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2636                 rc = -EPROTO;
2637                 goto failed;
2638         }
2639
2640         if (msg->ibm_u.connparams.ibcp_queue_depth !=
2641             IBLND_MSG_QUEUE_SIZE(ver)) {
2642                 CERROR("%s has incompatible queue depth %d(%d wanted)\n",
2643                        libcfs_nid2str(peer->ibp_nid),
2644                        msg->ibm_u.connparams.ibcp_queue_depth,
2645                        IBLND_MSG_QUEUE_SIZE(ver));
2646                 rc = -EPROTO;
2647                 goto failed;
2648         }
2649
2650         if (msg->ibm_u.connparams.ibcp_max_frags !=
2651             IBLND_RDMA_FRAGS(ver)) {
2652                 CERROR("%s has incompatible max_frags %d (%d wanted)\n",
2653                        libcfs_nid2str(peer->ibp_nid),
2654                        msg->ibm_u.connparams.ibcp_max_frags,
2655                        IBLND_RDMA_FRAGS(ver));
2656                 rc = -EPROTO;
2657                 goto failed;
2658         }
2659
2660         if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2661                 CERROR("%s max message size %d too big (%d max)\n",
2662                        libcfs_nid2str(peer->ibp_nid),
2663                        msg->ibm_u.connparams.ibcp_max_msg_size,
2664                        IBLND_MSG_SIZE);
2665                 rc = -EPROTO;
2666                 goto failed;
2667         }
2668
2669         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2670         if (msg->ibm_dstnid == ni->ni_nid &&
2671             msg->ibm_dststamp == net->ibn_incarnation)
2672                 rc = 0;
2673         else
2674                 rc = -ESTALE;
2675         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2676
2677         if (rc != 0) {
2678                 CERROR("Bad connection reply from %s, rc = %d, version: %x max_frags: %d\n",
2679                        libcfs_nid2str(peer->ibp_nid), rc,
2680                        msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2681                 goto failed;
2682         }
2683
2684         conn->ibc_incarnation = msg->ibm_srcstamp;
2685         conn->ibc_credits =
2686         conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(ver);
2687         LASSERT(conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(ver)
2688                  <= IBLND_RX_MSGS(ver));
2689
2690         kiblnd_connreq_done(conn, 0);
2691         return;
2692
2693  failed:
2694         /* NB My QP has already established itself, so I handle anything going
2695          * wrong here by setting ibc_comms_error.
2696          * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2697          * immediately tears it down. */
2698
2699         LASSERT(rc != 0);
2700         conn->ibc_comms_error = rc;
2701         kiblnd_connreq_done(conn, 0);
2702 }
2703
2704 static int
2705 kiblnd_active_connect(struct rdma_cm_id *cmid)
2706 {
2707         kib_peer_t *peer = (kib_peer_t *)cmid->context;
2708         kib_conn_t *conn;
2709         kib_msg_t *msg;
2710         struct rdma_conn_param cp;
2711         int version;
2712         __u64 incarnation;
2713         unsigned long flags;
2714         int rc;
2715
2716         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2717
2718         incarnation = peer->ibp_incarnation;
2719         version = (peer->ibp_version == 0) ? IBLND_MSG_VERSION :
2720                                              peer->ibp_version;
2721
2722         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2723
2724         conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT, version);
2725         if (conn == NULL) {
2726                 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2727                 kiblnd_peer_decref(peer); /* lose cmid's ref */
2728                 return -ENOMEM;
2729         }
2730
2731         /* conn "owns" cmid now, so I return success from here on to ensure the
2732          * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2733          * on peer */
2734
2735         msg = &conn->ibc_connvars->cv_msg;
2736
2737         memset(msg, 0, sizeof(*msg));
2738         kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2739         msg->ibm_u.connparams.ibcp_queue_depth  = IBLND_MSG_QUEUE_SIZE(version);
2740         msg->ibm_u.connparams.ibcp_max_frags    = IBLND_RDMA_FRAGS(version);
2741         msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2742
2743         kiblnd_pack_msg(peer->ibp_ni, msg, version,
2744                         0, peer->ibp_nid, incarnation);
2745
2746         memset(&cp, 0, sizeof(cp));
2747         cp.private_data = msg;
2748         cp.private_data_len    = msg->ibm_nob;
2749         cp.responder_resources = 0;          /* No atomic ops or RDMA reads */
2750         cp.initiator_depth     = 0;
2751         cp.flow_control        = 1;
2752         cp.retry_count         = *kiblnd_tunables.kib_retry_count;
2753         cp.rnr_retry_count     = *kiblnd_tunables.kib_rnr_retry_count;
2754
2755         LASSERT(cmid->context == (void *)conn);
2756         LASSERT(conn->ibc_cmid == cmid);
2757
2758         rc = rdma_connect(cmid, &cp);
2759         if (rc != 0) {
2760                 CERROR("Can't connect to %s: %d\n",
2761                        libcfs_nid2str(peer->ibp_nid), rc);
2762                 kiblnd_connreq_done(conn, rc);
2763                 kiblnd_conn_decref(conn);
2764         }
2765
2766         return 0;
2767 }
2768
2769 int
2770 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2771 {
2772         kib_peer_t *peer;
2773         kib_conn_t *conn;
2774         int rc;
2775
2776         switch (event->event) {
2777         default:
2778                 CERROR("Unexpected event: %d, status: %d\n",
2779                        event->event, event->status);
2780                 LBUG();
2781
2782         case RDMA_CM_EVENT_CONNECT_REQUEST:
2783                 /* destroy cmid on failure */
2784                 rc = kiblnd_passive_connect(cmid,
2785                                             (void *)KIBLND_CONN_PARAM(event),
2786                                             KIBLND_CONN_PARAM_LEN(event));
2787                 CDEBUG(D_NET, "connreq: %d\n", rc);
2788                 return rc;
2789
2790         case RDMA_CM_EVENT_ADDR_ERROR:
2791                 peer = (kib_peer_t *)cmid->context;
2792                 CNETERR("%s: ADDR ERROR %d\n",
2793                        libcfs_nid2str(peer->ibp_nid), event->status);
2794                 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2795                 kiblnd_peer_decref(peer);
2796                 return -EHOSTUNREACH;      /* rc != 0 destroys cmid */
2797
2798         case RDMA_CM_EVENT_ADDR_RESOLVED:
2799                 peer = (kib_peer_t *)cmid->context;
2800
2801                 CDEBUG(D_NET, "%s Addr resolved: %d\n",
2802                        libcfs_nid2str(peer->ibp_nid), event->status);
2803
2804                 if (event->status != 0) {
2805                         CNETERR("Can't resolve address for %s: %d\n",
2806                                 libcfs_nid2str(peer->ibp_nid), event->status);
2807                         rc = event->status;
2808                 } else {
2809                         rc = rdma_resolve_route(
2810                                 cmid, *kiblnd_tunables.kib_timeout * 1000);
2811                         if (rc == 0)
2812                                 return 0;
2813                         /* Can't initiate route resolution */
2814                         CERROR("Can't resolve route for %s: %d\n",
2815                                libcfs_nid2str(peer->ibp_nid), rc);
2816                 }
2817                 kiblnd_peer_connect_failed(peer, 1, rc);
2818                 kiblnd_peer_decref(peer);
2819                 return rc;                    /* rc != 0 destroys cmid */
2820
2821         case RDMA_CM_EVENT_ROUTE_ERROR:
2822                 peer = (kib_peer_t *)cmid->context;
2823                 CNETERR("%s: ROUTE ERROR %d\n",
2824                         libcfs_nid2str(peer->ibp_nid), event->status);
2825                 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2826                 kiblnd_peer_decref(peer);
2827                 return -EHOSTUNREACH;      /* rc != 0 destroys cmid */
2828
2829         case RDMA_CM_EVENT_ROUTE_RESOLVED:
2830                 peer = (kib_peer_t *)cmid->context;
2831                 CDEBUG(D_NET, "%s Route resolved: %d\n",
2832                        libcfs_nid2str(peer->ibp_nid), event->status);
2833
2834                 if (event->status == 0)
2835                         return kiblnd_active_connect(cmid);
2836
2837                 CNETERR("Can't resolve route for %s: %d\n",
2838                        libcfs_nid2str(peer->ibp_nid), event->status);
2839                 kiblnd_peer_connect_failed(peer, 1, event->status);
2840                 kiblnd_peer_decref(peer);
2841                 return event->status;      /* rc != 0 destroys cmid */
2842
2843         case RDMA_CM_EVENT_UNREACHABLE:
2844                 conn = (kib_conn_t *)cmid->context;
2845                 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2846                         conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2847                 CNETERR("%s: UNREACHABLE %d\n",
2848                        libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2849                 kiblnd_connreq_done(conn, -ENETDOWN);
2850                 kiblnd_conn_decref(conn);
2851                 return 0;
2852
2853         case RDMA_CM_EVENT_CONNECT_ERROR:
2854                 conn = (kib_conn_t *)cmid->context;
2855                 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2856                         conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2857                 CNETERR("%s: CONNECT ERROR %d\n",
2858                         libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2859                 kiblnd_connreq_done(conn, -ENOTCONN);
2860                 kiblnd_conn_decref(conn);
2861                 return 0;
2862
2863         case RDMA_CM_EVENT_REJECTED:
2864                 conn = (kib_conn_t *)cmid->context;
2865                 switch (conn->ibc_state) {
2866                 default:
2867                         LBUG();
2868
2869                 case IBLND_CONN_PASSIVE_WAIT:
2870                         CERROR("%s: REJECTED %d\n",
2871                                 libcfs_nid2str(conn->ibc_peer->ibp_nid),
2872                                 event->status);
2873                         kiblnd_connreq_done(conn, -ECONNRESET);
2874                         break;
2875
2876                 case IBLND_CONN_ACTIVE_CONNECT:
2877                         kiblnd_rejected(conn, event->status,
2878                                         (void *)KIBLND_CONN_PARAM(event),
2879                                         KIBLND_CONN_PARAM_LEN(event));
2880                         break;
2881                 }
2882                 kiblnd_conn_decref(conn);
2883                 return 0;
2884
2885         case RDMA_CM_EVENT_ESTABLISHED:
2886                 conn = (kib_conn_t *)cmid->context;
2887                 switch (conn->ibc_state) {
2888                 default:
2889                         LBUG();
2890
2891                 case IBLND_CONN_PASSIVE_WAIT:
2892                         CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
2893                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
2894                         kiblnd_connreq_done(conn, 0);
2895                         break;
2896
2897                 case IBLND_CONN_ACTIVE_CONNECT:
2898                         CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
2899                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
2900                         kiblnd_check_connreply(conn,
2901                                                (void *)KIBLND_CONN_PARAM(event),
2902                                                KIBLND_CONN_PARAM_LEN(event));
2903                         break;
2904                 }
2905                 /* net keeps its ref on conn! */
2906                 return 0;
2907
2908         case RDMA_CM_EVENT_TIMEWAIT_EXIT:
2909                 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
2910                 return 0;
2911         case RDMA_CM_EVENT_DISCONNECTED:
2912                 conn = (kib_conn_t *)cmid->context;
2913                 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
2914                         CERROR("%s DISCONNECTED\n",
2915                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
2916                         kiblnd_connreq_done(conn, -ECONNRESET);
2917                 } else {
2918                         kiblnd_close_conn(conn, 0);
2919                 }
2920                 kiblnd_conn_decref(conn);
2921                 cmid->context = NULL;
2922                 return 0;
2923
2924         case RDMA_CM_EVENT_DEVICE_REMOVAL:
2925                 LCONSOLE_ERROR_MSG(0x131,
2926                                    "Received notification of device removal\n"
2927                                    "Please shutdown LNET to allow this to proceed\n");
2928                 /* Can't remove network from underneath LNET for now, so I have
2929                  * to ignore this */
2930                 return 0;
2931
2932         case RDMA_CM_EVENT_ADDR_CHANGE:
2933                 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
2934                 return 0;
2935         }
2936 }
2937
2938 static int
2939 kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
2940 {
2941         kib_tx_t *tx;
2942         struct list_head *ttmp;
2943
2944         list_for_each(ttmp, txs) {
2945                 tx = list_entry(ttmp, kib_tx_t, tx_list);
2946
2947                 if (txs != &conn->ibc_active_txs) {
2948                         LASSERT(tx->tx_queued);
2949                 } else {
2950                         LASSERT(!tx->tx_queued);
2951                         LASSERT(tx->tx_waiting || tx->tx_sending != 0);
2952                 }
2953
2954                 if (cfs_time_aftereq(jiffies, tx->tx_deadline)) {
2955                         CERROR("Timed out tx: %s, %lu seconds\n",
2956                                kiblnd_queue2str(conn, txs),
2957                                cfs_duration_sec(jiffies - tx->tx_deadline));
2958                         return 1;
2959                 }
2960         }
2961
2962         return 0;
2963 }
2964
2965 static int
2966 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
2967 {
2968         return  kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
2969                 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
2970                 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
2971                 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
2972                 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
2973 }
2974
2975 static void
2976 kiblnd_check_conns(int idx)
2977 {
2978         LIST_HEAD(closes);
2979         LIST_HEAD(checksends);
2980         struct list_head *peers = &kiblnd_data.kib_peers[idx];
2981         struct list_head *ptmp;
2982         kib_peer_t *peer;
2983         kib_conn_t *conn;
2984         kib_conn_t *tmp;
2985         struct list_head *ctmp;
2986         unsigned long flags;
2987
2988         /* NB. We expect to have a look at all the peers and not find any
2989          * RDMAs to time out, so we just use a shared lock while we
2990          * take a look... */
2991         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2992
2993         list_for_each(ptmp, peers) {
2994                 peer = list_entry(ptmp, kib_peer_t, ibp_list);
2995
2996                 list_for_each(ctmp, &peer->ibp_conns) {
2997                         int timedout;
2998                         int sendnoop;
2999
3000                         conn = list_entry(ctmp, kib_conn_t, ibc_list);
3001
3002                         LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3003
3004                         spin_lock(&conn->ibc_lock);
3005
3006                         sendnoop = kiblnd_need_noop(conn);
3007                         timedout = kiblnd_conn_timed_out_locked(conn);
3008                         if (!sendnoop && !timedout) {
3009                                 spin_unlock(&conn->ibc_lock);
3010                                 continue;
3011                         }
3012
3013                         if (timedout) {
3014                                 CERROR("Timed out RDMA with %s (%lu): c: %u, oc: %u, rc: %u\n",
3015                                        libcfs_nid2str(peer->ibp_nid),
3016                                        cfs_duration_sec(cfs_time_current() -
3017                                                         peer->ibp_last_alive),
3018                                        conn->ibc_credits,
3019                                        conn->ibc_outstanding_credits,
3020                                        conn->ibc_reserved_credits);
3021                                 list_add(&conn->ibc_connd_list, &closes);
3022                         } else {
3023                                 list_add(&conn->ibc_connd_list,
3024                                              &checksends);
3025                         }
3026                         /* +ref for 'closes' or 'checksends' */
3027                         kiblnd_conn_addref(conn);
3028
3029                         spin_unlock(&conn->ibc_lock);
3030                 }
3031         }
3032
3033         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3034
3035         /* Handle timeout by closing the whole
3036          * connection. We can only be sure RDMA activity
3037          * has ceased once the QP has been modified. */
3038         list_for_each_entry_safe(conn, tmp, &closes, ibc_connd_list) {
3039                 list_del(&conn->ibc_connd_list);
3040                 kiblnd_close_conn(conn, -ETIMEDOUT);
3041                 kiblnd_conn_decref(conn);
3042         }
3043
3044         /* In case we have enough credits to return via a
3045          * NOOP, but there were no non-blocking tx descs
3046          * free to do it last time... */
3047         while (!list_empty(&checksends)) {
3048                 conn = list_entry(checksends.next,
3049                                       kib_conn_t, ibc_connd_list);
3050                 list_del(&conn->ibc_connd_list);
3051                 kiblnd_check_sends(conn);
3052                 kiblnd_conn_decref(conn);
3053         }
3054 }
3055
3056 static void
3057 kiblnd_disconnect_conn(kib_conn_t *conn)
3058 {
3059         LASSERT(!in_interrupt());
3060         LASSERT(current == kiblnd_data.kib_connd);
3061         LASSERT(conn->ibc_state == IBLND_CONN_CLOSING);
3062
3063         rdma_disconnect(conn->ibc_cmid);
3064         kiblnd_finalise_conn(conn);
3065
3066         kiblnd_peer_notify(conn->ibc_peer);
3067 }
3068
3069 int
3070 kiblnd_connd(void *arg)
3071 {
3072         wait_queue_t wait;
3073         unsigned long flags;
3074         kib_conn_t *conn;
3075         int timeout;
3076         int i;
3077         int dropped_lock;
3078         int peer_index = 0;
3079         unsigned long deadline = jiffies;
3080
3081         cfs_block_allsigs();
3082
3083         init_waitqueue_entry(&wait, current);
3084         kiblnd_data.kib_connd = current;
3085
3086         spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3087
3088         while (!kiblnd_data.kib_shutdown) {
3089
3090                 dropped_lock = 0;
3091
3092                 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3093                         conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3094                                               kib_conn_t, ibc_list);
3095                         list_del(&conn->ibc_list);
3096
3097                         spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock,
3098                                                flags);
3099                         dropped_lock = 1;
3100
3101                         kiblnd_destroy_conn(conn);
3102
3103                         spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3104                 }
3105
3106                 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3107                         conn = list_entry(kiblnd_data.kib_connd_conns.next,
3108                                               kib_conn_t, ibc_list);
3109                         list_del(&conn->ibc_list);
3110
3111                         spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock,
3112                                                flags);
3113                         dropped_lock = 1;
3114
3115                         kiblnd_disconnect_conn(conn);
3116                         kiblnd_conn_decref(conn);
3117
3118                         spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3119                 }
3120
3121                 /* careful with the jiffy wrap... */
3122                 timeout = (int)(deadline - jiffies);
3123                 if (timeout <= 0) {
3124                         const int n = 4;
3125                         const int p = 1;
3126                         int chunk = kiblnd_data.kib_peer_hash_size;
3127
3128                         spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3129                         dropped_lock = 1;
3130
3131                         /* Time to check for RDMA timeouts on a few more
3132                          * peers: I do checks every 'p' seconds on a
3133                          * proportion of the peer table and I need to check
3134                          * every connection 'n' times within a timeout
3135                          * interval, to ensure I detect a timeout on any
3136                          * connection within (n+1)/n times the timeout
3137                          * interval. */
3138
3139                         if (*kiblnd_tunables.kib_timeout > n * p)
3140                                 chunk = (chunk * n * p) /
3141                                         *kiblnd_tunables.kib_timeout;
3142                         if (chunk == 0)
3143                                 chunk = 1;
3144
3145                         for (i = 0; i < chunk; i++) {
3146                                 kiblnd_check_conns(peer_index);
3147                                 peer_index = (peer_index + 1) %
3148                                              kiblnd_data.kib_peer_hash_size;
3149                         }
3150
3151                         deadline += p * HZ;
3152                         spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3153                 }
3154
3155                 if (dropped_lock)
3156                         continue;
3157
3158                 /* Nothing to do for 'timeout'  */
3159                 set_current_state(TASK_INTERRUPTIBLE);
3160                 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3161                 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3162
3163                 schedule_timeout(timeout);
3164
3165                 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3166                 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3167         }
3168
3169         spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3170
3171         kiblnd_thread_fini();
3172         return 0;
3173 }
3174
3175 void
3176 kiblnd_qp_event(struct ib_event *event, void *arg)
3177 {
3178         kib_conn_t *conn = arg;
3179
3180         switch (event->event) {
3181         case IB_EVENT_COMM_EST:
3182                 CDEBUG(D_NET, "%s established\n",
3183                        libcfs_nid2str(conn->ibc_peer->ibp_nid));
3184                 return;
3185
3186         default:
3187                 CERROR("%s: Async QP event type %d\n",
3188                        libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3189                 return;
3190         }
3191 }
3192
3193 static void
3194 kiblnd_complete(struct ib_wc *wc)
3195 {
3196         switch (kiblnd_wreqid2type(wc->wr_id)) {
3197         default:
3198                 LBUG();
3199
3200         case IBLND_WID_RDMA:
3201                 /* We only get RDMA completion notification if it fails.  All
3202                  * subsequent work items, including the final SEND will fail
3203                  * too.  However we can't print out any more info about the
3204                  * failing RDMA because 'tx' might be back on the idle list or
3205                  * even reused already if we didn't manage to post all our work
3206                  * items */
3207                 CNETERR("RDMA (tx: %p) failed: %d\n",
3208                         kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3209                 return;
3210
3211         case IBLND_WID_TX:
3212                 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3213                 return;
3214
3215         case IBLND_WID_RX:
3216                 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3217                                    wc->byte_len);
3218                 return;
3219         }
3220 }
3221
3222 void
3223 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3224 {
3225         /* NB I'm not allowed to schedule this conn once its refcount has
3226          * reached 0.  Since fundamentally I'm racing with scheduler threads
3227          * consuming my CQ I could be called after all completions have
3228          * occurred.  But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3229          * and this CQ is about to be destroyed so I NOOP. */
3230         kib_conn_t *conn = (kib_conn_t *)arg;
3231         struct kib_sched_info *sched = conn->ibc_sched;
3232         unsigned long flags;
3233
3234         LASSERT(cq == conn->ibc_cq);
3235
3236         spin_lock_irqsave(&sched->ibs_lock, flags);
3237
3238         conn->ibc_ready = 1;
3239
3240         if (!conn->ibc_scheduled &&
3241             (conn->ibc_nrx > 0 ||
3242              conn->ibc_nsends_posted > 0)) {
3243                 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3244                 conn->ibc_scheduled = 1;
3245                 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3246
3247                 if (waitqueue_active(&sched->ibs_waitq))
3248                         wake_up(&sched->ibs_waitq);
3249         }
3250
3251         spin_unlock_irqrestore(&sched->ibs_lock, flags);
3252 }
3253
3254 void
3255 kiblnd_cq_event(struct ib_event *event, void *arg)
3256 {
3257         kib_conn_t *conn = arg;
3258
3259         CERROR("%s: async CQ event type %d\n",
3260                libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3261 }
3262
3263 int
3264 kiblnd_scheduler(void *arg)
3265 {
3266         long id = (long)arg;
3267         struct kib_sched_info *sched;
3268         kib_conn_t *conn;
3269         wait_queue_t wait;
3270         unsigned long flags;
3271         struct ib_wc wc;
3272         int did_something;
3273         int busy_loops = 0;
3274         int rc;
3275
3276         cfs_block_allsigs();
3277
3278         init_waitqueue_entry(&wait, current);
3279
3280         sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3281
3282         rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3283         if (rc != 0) {
3284                 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",
3285                       sched->ibs_cpt);
3286         }
3287
3288         spin_lock_irqsave(&sched->ibs_lock, flags);
3289
3290         while (!kiblnd_data.kib_shutdown) {
3291                 if (busy_loops++ >= IBLND_RESCHED) {
3292                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
3293
3294                         cond_resched();
3295                         busy_loops = 0;
3296
3297                         spin_lock_irqsave(&sched->ibs_lock, flags);
3298                 }
3299
3300                 did_something = 0;
3301
3302                 if (!list_empty(&sched->ibs_conns)) {
3303                         conn = list_entry(sched->ibs_conns.next,
3304                                               kib_conn_t, ibc_sched_list);
3305                         /* take over kib_sched_conns' ref on conn... */
3306                         LASSERT(conn->ibc_scheduled);
3307                         list_del(&conn->ibc_sched_list);
3308                         conn->ibc_ready = 0;
3309
3310                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
3311
3312                         rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3313                         if (rc == 0) {
3314                                 rc = ib_req_notify_cq(conn->ibc_cq,
3315                                                       IB_CQ_NEXT_COMP);
3316                                 if (rc < 0) {
3317                                         CWARN("%s: ib_req_notify_cq failed: %d, closing connection\n",
3318                                               libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3319                                         kiblnd_close_conn(conn, -EIO);
3320                                         kiblnd_conn_decref(conn);
3321                                         spin_lock_irqsave(&sched->ibs_lock,
3322                                                               flags);
3323                                         continue;
3324                                 }
3325
3326                                 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3327                         }
3328
3329                         if (rc < 0) {
3330                                 CWARN("%s: ib_poll_cq failed: %d, closing connection\n",
3331                                       libcfs_nid2str(conn->ibc_peer->ibp_nid),
3332                                       rc);
3333                                 kiblnd_close_conn(conn, -EIO);
3334                                 kiblnd_conn_decref(conn);
3335                                 spin_lock_irqsave(&sched->ibs_lock, flags);
3336                                 continue;
3337                         }
3338
3339                         spin_lock_irqsave(&sched->ibs_lock, flags);
3340
3341                         if (rc != 0 || conn->ibc_ready) {
3342                                 /* There may be another completion waiting; get
3343                                  * another scheduler to check while I handle
3344                                  * this one... */
3345                                 /* +1 ref for sched_conns */
3346                                 kiblnd_conn_addref(conn);
3347                                 list_add_tail(&conn->ibc_sched_list,
3348                                                   &sched->ibs_conns);
3349                                 if (waitqueue_active(&sched->ibs_waitq))
3350                                         wake_up(&sched->ibs_waitq);
3351                         } else {
3352                                 conn->ibc_scheduled = 0;
3353                         }
3354
3355                         if (rc != 0) {
3356                                 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3357                                 kiblnd_complete(&wc);
3358
3359                                 spin_lock_irqsave(&sched->ibs_lock, flags);
3360                         }
3361
3362                         kiblnd_conn_decref(conn); /* ...drop my ref from above */
3363                         did_something = 1;
3364                 }
3365
3366                 if (did_something)
3367                         continue;
3368
3369                 set_current_state(TASK_INTERRUPTIBLE);
3370                 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3371                 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3372
3373                 schedule();
3374                 busy_loops = 0;
3375
3376                 remove_wait_queue(&sched->ibs_waitq, &wait);
3377                 spin_lock_irqsave(&sched->ibs_lock, flags);
3378         }
3379
3380         spin_unlock_irqrestore(&sched->ibs_lock, flags);
3381
3382         kiblnd_thread_fini();
3383         return 0;
3384 }
3385
3386 int
3387 kiblnd_failover_thread(void *arg)
3388 {
3389         rwlock_t *glock = &kiblnd_data.kib_global_lock;
3390         kib_dev_t *dev;
3391         wait_queue_t wait;
3392         unsigned long flags;
3393         int rc;
3394
3395         LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
3396
3397         cfs_block_allsigs();
3398
3399         init_waitqueue_entry(&wait, current);
3400         write_lock_irqsave(glock, flags);
3401
3402         while (!kiblnd_data.kib_shutdown) {
3403                 int do_failover = 0;
3404                 int long_sleep;
3405
3406                 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3407                                     ibd_fail_list) {
3408                         if (time_before(cfs_time_current(),
3409                                         dev->ibd_next_failover))
3410                                 continue;
3411                         do_failover = 1;
3412                         break;
3413                 }
3414
3415                 if (do_failover) {
3416                         list_del_init(&dev->ibd_fail_list);
3417                         dev->ibd_failover = 1;
3418                         write_unlock_irqrestore(glock, flags);
3419
3420                         rc = kiblnd_dev_failover(dev);
3421
3422                         write_lock_irqsave(glock, flags);
3423
3424                         LASSERT(dev->ibd_failover);
3425                         dev->ibd_failover = 0;
3426                         if (rc >= 0) { /* Device is OK or failover succeed */
3427                                 dev->ibd_next_failover = cfs_time_shift(3);
3428                                 continue;
3429                         }
3430
3431                         /* failed to failover, retry later */
3432                         dev->ibd_next_failover =
3433                                 cfs_time_shift(min(dev->ibd_failed_failover, 10));
3434                         if (kiblnd_dev_can_failover(dev)) {
3435                                 list_add_tail(&dev->ibd_fail_list,
3436                                               &kiblnd_data.kib_failed_devs);
3437                         }
3438
3439                         continue;
3440                 }
3441
3442                 /* long sleep if no more pending failover */
3443                 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3444
3445                 set_current_state(TASK_INTERRUPTIBLE);
3446                 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3447                 write_unlock_irqrestore(glock, flags);
3448
3449                 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3450                                                    cfs_time_seconds(1));
3451                 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3452                 write_lock_irqsave(glock, flags);
3453
3454                 if (!long_sleep || rc != 0)
3455                         continue;
3456
3457                 /* have a long sleep, routine check all active devices,
3458                  * we need checking like this because if there is not active
3459                  * connection on the dev and no SEND from local, we may listen
3460                  * on wrong HCA for ever while there is a bonding failover */
3461                 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3462                         if (kiblnd_dev_can_failover(dev)) {
3463                                 list_add_tail(&dev->ibd_fail_list,
3464                                               &kiblnd_data.kib_failed_devs);
3465                         }
3466                 }
3467         }
3468
3469         write_unlock_irqrestore(glock, flags);
3470
3471         kiblnd_thread_fini();
3472         return 0;
3473 }